mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
4aeddc50d7
Remove all macros related to getting and setting some symbol value: #define SYMBOL_VALUE(symbol) (symbol)->value.ivalue #define SYMBOL_VALUE_ADDRESS(symbol) \ #define SET_SYMBOL_VALUE_ADDRESS(symbol, new_value) \ #define SYMBOL_VALUE_BYTES(symbol) (symbol)->value.bytes #define SYMBOL_VALUE_COMMON_BLOCK(symbol) (symbol)->value.common_block #define SYMBOL_BLOCK_VALUE(symbol) (symbol)->value.block #define SYMBOL_VALUE_CHAIN(symbol) (symbol)->value.chain #define MSYMBOL_VALUE(symbol) (symbol)->value.ivalue #define MSYMBOL_VALUE_RAW_ADDRESS(symbol) ((symbol)->value.address + 0) #define MSYMBOL_VALUE_ADDRESS(objfile, symbol) \ #define BMSYMBOL_VALUE_ADDRESS(symbol) \ #define SET_MSYMBOL_VALUE_ADDRESS(symbol, new_value) \ #define MSYMBOL_VALUE_BYTES(symbol) (symbol)->value.bytes #define MSYMBOL_BLOCK_VALUE(symbol) (symbol)->value.block Replace them with equivalent methods on the appropriate objects. Change-Id: Iafdab3b8eefc6dc2fd895aa955bf64fafc59ed50
9912 lines
317 KiB
C
9912 lines
317 KiB
C
/* Target-struct-independent code to start (run) and stop an inferior
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process.
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Copyright (C) 1986-2022 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "displaced-stepping.h"
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#include "infrun.h"
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#include <ctype.h>
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#include "symtab.h"
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#include "frame.h"
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#include "inferior.h"
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#include "breakpoint.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "target-connection.h"
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#include "gdbthread.h"
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#include "annotate.h"
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#include "symfile.h"
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#include "top.h"
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#include "inf-loop.h"
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#include "regcache.h"
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#include "value.h"
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#include "observable.h"
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#include "language.h"
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#include "solib.h"
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#include "main.h"
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#include "block.h"
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#include "mi/mi-common.h"
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#include "event-top.h"
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#include "record.h"
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#include "record-full.h"
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#include "inline-frame.h"
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#include "jit.h"
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#include "tracepoint.h"
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#include "skip.h"
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#include "probe.h"
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#include "objfiles.h"
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#include "completer.h"
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#include "target-descriptions.h"
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#include "target-dcache.h"
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#include "terminal.h"
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#include "solist.h"
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#include "gdbsupport/event-loop.h"
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#include "thread-fsm.h"
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#include "gdbsupport/enum-flags.h"
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#include "progspace-and-thread.h"
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#include "gdbsupport/gdb_optional.h"
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#include "arch-utils.h"
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#include "gdbsupport/scope-exit.h"
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#include "gdbsupport/forward-scope-exit.h"
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#include "gdbsupport/gdb_select.h"
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#include <unordered_map>
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#include "async-event.h"
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#include "gdbsupport/selftest.h"
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#include "scoped-mock-context.h"
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#include "test-target.h"
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#include "gdbsupport/common-debug.h"
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#include "gdbsupport/buildargv.h"
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/* Prototypes for local functions */
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static void sig_print_info (enum gdb_signal);
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static void sig_print_header (void);
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static void follow_inferior_reset_breakpoints (void);
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static bool currently_stepping (struct thread_info *tp);
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static void insert_hp_step_resume_breakpoint_at_frame (struct frame_info *);
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static void insert_step_resume_breakpoint_at_caller (struct frame_info *);
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static void insert_longjmp_resume_breakpoint (struct gdbarch *, CORE_ADDR);
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static bool maybe_software_singlestep (struct gdbarch *gdbarch);
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static void resume (gdb_signal sig);
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static void wait_for_inferior (inferior *inf);
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static void restart_threads (struct thread_info *event_thread,
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inferior *inf = nullptr);
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static bool start_step_over (void);
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/* Asynchronous signal handler registered as event loop source for
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when we have pending events ready to be passed to the core. */
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static struct async_event_handler *infrun_async_inferior_event_token;
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/* Stores whether infrun_async was previously enabled or disabled.
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Starts off as -1, indicating "never enabled/disabled". */
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static int infrun_is_async = -1;
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/* See infrun.h. */
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void
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infrun_async (int enable)
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{
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if (infrun_is_async != enable)
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{
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infrun_is_async = enable;
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infrun_debug_printf ("enable=%d", enable);
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if (enable)
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mark_async_event_handler (infrun_async_inferior_event_token);
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else
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clear_async_event_handler (infrun_async_inferior_event_token);
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}
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}
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/* See infrun.h. */
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void
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mark_infrun_async_event_handler (void)
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{
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mark_async_event_handler (infrun_async_inferior_event_token);
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}
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/* When set, stop the 'step' command if we enter a function which has
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no line number information. The normal behavior is that we step
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over such function. */
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bool step_stop_if_no_debug = false;
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static void
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show_step_stop_if_no_debug (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file, _("Mode of the step operation is %s.\n"), value);
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}
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/* proceed and normal_stop use this to notify the user when the
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inferior stopped in a different thread than it had been running
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in. */
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static ptid_t previous_inferior_ptid;
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/* If set (default for legacy reasons), when following a fork, GDB
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will detach from one of the fork branches, child or parent.
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Exactly which branch is detached depends on 'set follow-fork-mode'
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setting. */
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static bool detach_fork = true;
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bool debug_infrun = false;
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static void
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show_debug_infrun (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file, _("Inferior debugging is %s.\n"), value);
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}
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/* Support for disabling address space randomization. */
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bool disable_randomization = true;
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static void
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show_disable_randomization (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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if (target_supports_disable_randomization ())
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gdb_printf (file,
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_("Disabling randomization of debuggee's "
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"virtual address space is %s.\n"),
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value);
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else
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gdb_puts (_("Disabling randomization of debuggee's "
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"virtual address space is unsupported on\n"
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"this platform.\n"), file);
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}
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static void
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set_disable_randomization (const char *args, int from_tty,
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struct cmd_list_element *c)
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{
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if (!target_supports_disable_randomization ())
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error (_("Disabling randomization of debuggee's "
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"virtual address space is unsupported on\n"
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"this platform."));
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}
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/* User interface for non-stop mode. */
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bool non_stop = false;
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static bool non_stop_1 = false;
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static void
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set_non_stop (const char *args, int from_tty,
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struct cmd_list_element *c)
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{
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if (target_has_execution ())
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{
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non_stop_1 = non_stop;
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error (_("Cannot change this setting while the inferior is running."));
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}
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non_stop = non_stop_1;
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}
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static void
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show_non_stop (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file,
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_("Controlling the inferior in non-stop mode is %s.\n"),
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value);
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}
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/* "Observer mode" is somewhat like a more extreme version of
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non-stop, in which all GDB operations that might affect the
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target's execution have been disabled. */
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static bool observer_mode = false;
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static bool observer_mode_1 = false;
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static void
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set_observer_mode (const char *args, int from_tty,
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struct cmd_list_element *c)
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{
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if (target_has_execution ())
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{
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observer_mode_1 = observer_mode;
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error (_("Cannot change this setting while the inferior is running."));
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}
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observer_mode = observer_mode_1;
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may_write_registers = !observer_mode;
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may_write_memory = !observer_mode;
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may_insert_breakpoints = !observer_mode;
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may_insert_tracepoints = !observer_mode;
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/* We can insert fast tracepoints in or out of observer mode,
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but enable them if we're going into this mode. */
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if (observer_mode)
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may_insert_fast_tracepoints = true;
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may_stop = !observer_mode;
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update_target_permissions ();
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/* Going *into* observer mode we must force non-stop, then
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going out we leave it that way. */
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if (observer_mode)
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{
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pagination_enabled = 0;
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non_stop = non_stop_1 = true;
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}
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if (from_tty)
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gdb_printf (_("Observer mode is now %s.\n"),
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(observer_mode ? "on" : "off"));
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}
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static void
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show_observer_mode (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file, _("Observer mode is %s.\n"), value);
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}
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/* This updates the value of observer mode based on changes in
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permissions. Note that we are deliberately ignoring the values of
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may-write-registers and may-write-memory, since the user may have
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reason to enable these during a session, for instance to turn on a
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debugging-related global. */
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void
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update_observer_mode (void)
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{
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bool newval = (!may_insert_breakpoints
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&& !may_insert_tracepoints
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&& may_insert_fast_tracepoints
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&& !may_stop
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&& non_stop);
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/* Let the user know if things change. */
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if (newval != observer_mode)
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gdb_printf (_("Observer mode is now %s.\n"),
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(newval ? "on" : "off"));
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observer_mode = observer_mode_1 = newval;
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}
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/* Tables of how to react to signals; the user sets them. */
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static unsigned char signal_stop[GDB_SIGNAL_LAST];
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static unsigned char signal_print[GDB_SIGNAL_LAST];
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static unsigned char signal_program[GDB_SIGNAL_LAST];
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/* Table of signals that are registered with "catch signal". A
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non-zero entry indicates that the signal is caught by some "catch
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signal" command. */
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static unsigned char signal_catch[GDB_SIGNAL_LAST];
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/* Table of signals that the target may silently handle.
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This is automatically determined from the flags above,
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and simply cached here. */
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static unsigned char signal_pass[GDB_SIGNAL_LAST];
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#define SET_SIGS(nsigs,sigs,flags) \
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do { \
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int signum = (nsigs); \
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while (signum-- > 0) \
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if ((sigs)[signum]) \
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(flags)[signum] = 1; \
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} while (0)
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#define UNSET_SIGS(nsigs,sigs,flags) \
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do { \
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int signum = (nsigs); \
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while (signum-- > 0) \
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if ((sigs)[signum]) \
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(flags)[signum] = 0; \
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} while (0)
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/* Update the target's copy of SIGNAL_PROGRAM. The sole purpose of
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this function is to avoid exporting `signal_program'. */
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void
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update_signals_program_target (void)
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{
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target_program_signals (signal_program);
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}
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/* Value to pass to target_resume() to cause all threads to resume. */
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#define RESUME_ALL minus_one_ptid
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/* Command list pointer for the "stop" placeholder. */
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static struct cmd_list_element *stop_command;
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/* Nonzero if we want to give control to the user when we're notified
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of shared library events by the dynamic linker. */
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int stop_on_solib_events;
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/* Enable or disable optional shared library event breakpoints
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as appropriate when the above flag is changed. */
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static void
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set_stop_on_solib_events (const char *args,
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int from_tty, struct cmd_list_element *c)
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{
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update_solib_breakpoints ();
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}
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static void
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show_stop_on_solib_events (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file, _("Stopping for shared library events is %s.\n"),
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value);
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}
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/* True after stop if current stack frame should be printed. */
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static bool stop_print_frame;
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/* This is a cached copy of the target/ptid/waitstatus of the last
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event returned by target_wait().
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This information is returned by get_last_target_status(). */
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static process_stratum_target *target_last_proc_target;
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static ptid_t target_last_wait_ptid;
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static struct target_waitstatus target_last_waitstatus;
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void init_thread_stepping_state (struct thread_info *tss);
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static const char follow_fork_mode_child[] = "child";
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static const char follow_fork_mode_parent[] = "parent";
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static const char *const follow_fork_mode_kind_names[] = {
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follow_fork_mode_child,
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follow_fork_mode_parent,
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NULL
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};
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static const char *follow_fork_mode_string = follow_fork_mode_parent;
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static void
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show_follow_fork_mode_string (struct ui_file *file, int from_tty,
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struct cmd_list_element *c, const char *value)
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{
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gdb_printf (file,
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_("Debugger response to a program "
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"call of fork or vfork is \"%s\".\n"),
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value);
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}
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/* Handle changes to the inferior list based on the type of fork,
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which process is being followed, and whether the other process
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should be detached. On entry inferior_ptid must be the ptid of
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the fork parent. At return inferior_ptid is the ptid of the
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followed inferior. */
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static bool
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follow_fork_inferior (bool follow_child, bool detach_fork)
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{
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target_waitkind fork_kind = inferior_thread ()->pending_follow.kind ();
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gdb_assert (fork_kind == TARGET_WAITKIND_FORKED
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|| fork_kind == TARGET_WAITKIND_VFORKED);
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bool has_vforked = fork_kind == TARGET_WAITKIND_VFORKED;
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ptid_t parent_ptid = inferior_ptid;
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ptid_t child_ptid = inferior_thread ()->pending_follow.child_ptid ();
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if (has_vforked
|
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&& !non_stop /* Non-stop always resumes both branches. */
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&& current_ui->prompt_state == PROMPT_BLOCKED
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&& !(follow_child || detach_fork || sched_multi))
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{
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/* The parent stays blocked inside the vfork syscall until the
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child execs or exits. If we don't let the child run, then
|
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the parent stays blocked. If we're telling the parent to run
|
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in the foreground, the user will not be able to ctrl-c to get
|
||
back the terminal, effectively hanging the debug session. */
|
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gdb_printf (gdb_stderr, _("\
|
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Can not resume the parent process over vfork in the foreground while\n\
|
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holding the child stopped. Try \"set detach-on-fork\" or \
|
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\"set schedule-multiple\".\n"));
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return true;
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||
}
|
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|
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inferior *parent_inf = current_inferior ();
|
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inferior *child_inf = nullptr;
|
||
|
||
gdb_assert (parent_inf->thread_waiting_for_vfork_done == nullptr);
|
||
|
||
if (!follow_child)
|
||
{
|
||
/* Detach new forked process? */
|
||
if (detach_fork)
|
||
{
|
||
/* Before detaching from the child, remove all breakpoints
|
||
from it. If we forked, then this has already been taken
|
||
care of by infrun.c. If we vforked however, any
|
||
breakpoint inserted in the parent is visible in the
|
||
child, even those added while stopped in a vfork
|
||
catchpoint. This will remove the breakpoints from the
|
||
parent also, but they'll be reinserted below. */
|
||
if (has_vforked)
|
||
{
|
||
/* Keep breakpoints list in sync. */
|
||
remove_breakpoints_inf (current_inferior ());
|
||
}
|
||
|
||
if (print_inferior_events)
|
||
{
|
||
/* Ensure that we have a process ptid. */
|
||
ptid_t process_ptid = ptid_t (child_ptid.pid ());
|
||
|
||
target_terminal::ours_for_output ();
|
||
gdb_printf (_("[Detaching after %s from child %s]\n"),
|
||
has_vforked ? "vfork" : "fork",
|
||
target_pid_to_str (process_ptid).c_str ());
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Add process to GDB's tables. */
|
||
child_inf = add_inferior (child_ptid.pid ());
|
||
|
||
child_inf->attach_flag = parent_inf->attach_flag;
|
||
copy_terminal_info (child_inf, parent_inf);
|
||
child_inf->gdbarch = parent_inf->gdbarch;
|
||
copy_inferior_target_desc_info (child_inf, parent_inf);
|
||
|
||
child_inf->symfile_flags = SYMFILE_NO_READ;
|
||
|
||
/* If this is a vfork child, then the address-space is
|
||
shared with the parent. */
|
||
if (has_vforked)
|
||
{
|
||
child_inf->pspace = parent_inf->pspace;
|
||
child_inf->aspace = parent_inf->aspace;
|
||
|
||
exec_on_vfork (child_inf);
|
||
|
||
/* The parent will be frozen until the child is done
|
||
with the shared region. Keep track of the
|
||
parent. */
|
||
child_inf->vfork_parent = parent_inf;
|
||
child_inf->pending_detach = 0;
|
||
parent_inf->vfork_child = child_inf;
|
||
parent_inf->pending_detach = 0;
|
||
}
|
||
else
|
||
{
|
||
child_inf->aspace = new_address_space ();
|
||
child_inf->pspace = new program_space (child_inf->aspace);
|
||
child_inf->removable = 1;
|
||
clone_program_space (child_inf->pspace, parent_inf->pspace);
|
||
}
|
||
}
|
||
|
||
if (has_vforked)
|
||
{
|
||
/* If we detached from the child, then we have to be careful
|
||
to not insert breakpoints in the parent until the child
|
||
is done with the shared memory region. However, if we're
|
||
staying attached to the child, then we can and should
|
||
insert breakpoints, so that we can debug it. A
|
||
subsequent child exec or exit is enough to know when does
|
||
the child stops using the parent's address space. */
|
||
parent_inf->thread_waiting_for_vfork_done
|
||
= detach_fork ? inferior_thread () : nullptr;
|
||
parent_inf->pspace->breakpoints_not_allowed = detach_fork;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Follow the child. */
|
||
|
||
if (print_inferior_events)
|
||
{
|
||
std::string parent_pid = target_pid_to_str (parent_ptid);
|
||
std::string child_pid = target_pid_to_str (child_ptid);
|
||
|
||
target_terminal::ours_for_output ();
|
||
gdb_printf (_("[Attaching after %s %s to child %s]\n"),
|
||
parent_pid.c_str (),
|
||
has_vforked ? "vfork" : "fork",
|
||
child_pid.c_str ());
|
||
}
|
||
|
||
/* Add the new inferior first, so that the target_detach below
|
||
doesn't unpush the target. */
|
||
|
||
child_inf = add_inferior (child_ptid.pid ());
|
||
|
||
child_inf->attach_flag = parent_inf->attach_flag;
|
||
copy_terminal_info (child_inf, parent_inf);
|
||
child_inf->gdbarch = parent_inf->gdbarch;
|
||
copy_inferior_target_desc_info (child_inf, parent_inf);
|
||
|
||
if (has_vforked)
|
||
{
|
||
/* If this is a vfork child, then the address-space is shared
|
||
with the parent. */
|
||
child_inf->aspace = parent_inf->aspace;
|
||
child_inf->pspace = parent_inf->pspace;
|
||
|
||
exec_on_vfork (child_inf);
|
||
}
|
||
else if (detach_fork)
|
||
{
|
||
/* We follow the child and detach from the parent: move the parent's
|
||
program space to the child. This simplifies some things, like
|
||
doing "next" over fork() and landing on the expected line in the
|
||
child (note, that is broken with "set detach-on-fork off").
|
||
|
||
Before assigning brand new spaces for the parent, remove
|
||
breakpoints from it: because the new pspace won't match
|
||
currently inserted locations, the normal detach procedure
|
||
wouldn't remove them, and we would leave them inserted when
|
||
detaching. */
|
||
remove_breakpoints_inf (parent_inf);
|
||
|
||
child_inf->aspace = parent_inf->aspace;
|
||
child_inf->pspace = parent_inf->pspace;
|
||
parent_inf->aspace = new_address_space ();
|
||
parent_inf->pspace = new program_space (parent_inf->aspace);
|
||
clone_program_space (parent_inf->pspace, child_inf->pspace);
|
||
|
||
/* The parent inferior is still the current one, so keep things
|
||
in sync. */
|
||
set_current_program_space (parent_inf->pspace);
|
||
}
|
||
else
|
||
{
|
||
child_inf->aspace = new_address_space ();
|
||
child_inf->pspace = new program_space (child_inf->aspace);
|
||
child_inf->removable = 1;
|
||
child_inf->symfile_flags = SYMFILE_NO_READ;
|
||
clone_program_space (child_inf->pspace, parent_inf->pspace);
|
||
}
|
||
}
|
||
|
||
gdb_assert (current_inferior () == parent_inf);
|
||
|
||
/* If we are setting up an inferior for the child, target_follow_fork is
|
||
responsible for pushing the appropriate targets on the new inferior's
|
||
target stack and adding the initial thread (with ptid CHILD_PTID).
|
||
|
||
If we are not setting up an inferior for the child (because following
|
||
the parent and detach_fork is true), it is responsible for detaching
|
||
from CHILD_PTID. */
|
||
target_follow_fork (child_inf, child_ptid, fork_kind, follow_child,
|
||
detach_fork);
|
||
|
||
/* target_follow_fork must leave the parent as the current inferior. If we
|
||
want to follow the child, we make it the current one below. */
|
||
gdb_assert (current_inferior () == parent_inf);
|
||
|
||
/* If there is a child inferior, target_follow_fork must have created a thread
|
||
for it. */
|
||
if (child_inf != nullptr)
|
||
gdb_assert (!child_inf->thread_list.empty ());
|
||
|
||
/* Clear the parent thread's pending follow field. Do this before calling
|
||
target_detach, so that the target can differentiate the two following
|
||
cases:
|
||
|
||
- We continue past a fork with "follow-fork-mode == child" &&
|
||
"detach-on-fork on", and therefore detach the parent. In that
|
||
case the target should not detach the fork child.
|
||
- We run to a fork catchpoint and the user types "detach". In that
|
||
case, the target should detach the fork child in addition to the
|
||
parent.
|
||
|
||
The former case will have pending_follow cleared, the later will have
|
||
pending_follow set. */
|
||
thread_info *parent_thread = find_thread_ptid (parent_inf, parent_ptid);
|
||
gdb_assert (parent_thread != nullptr);
|
||
parent_thread->pending_follow.set_spurious ();
|
||
|
||
/* Detach the parent if needed. */
|
||
if (follow_child)
|
||
{
|
||
/* If we're vforking, we want to hold on to the parent until
|
||
the child exits or execs. At child exec or exit time we
|
||
can remove the old breakpoints from the parent and detach
|
||
or resume debugging it. Otherwise, detach the parent now;
|
||
we'll want to reuse it's program/address spaces, but we
|
||
can't set them to the child before removing breakpoints
|
||
from the parent, otherwise, the breakpoints module could
|
||
decide to remove breakpoints from the wrong process (since
|
||
they'd be assigned to the same address space). */
|
||
|
||
if (has_vforked)
|
||
{
|
||
gdb_assert (child_inf->vfork_parent == NULL);
|
||
gdb_assert (parent_inf->vfork_child == NULL);
|
||
child_inf->vfork_parent = parent_inf;
|
||
child_inf->pending_detach = 0;
|
||
parent_inf->vfork_child = child_inf;
|
||
parent_inf->pending_detach = detach_fork;
|
||
}
|
||
else if (detach_fork)
|
||
{
|
||
if (print_inferior_events)
|
||
{
|
||
/* Ensure that we have a process ptid. */
|
||
ptid_t process_ptid = ptid_t (parent_ptid.pid ());
|
||
|
||
target_terminal::ours_for_output ();
|
||
gdb_printf (_("[Detaching after fork from "
|
||
"parent %s]\n"),
|
||
target_pid_to_str (process_ptid).c_str ());
|
||
}
|
||
|
||
target_detach (parent_inf, 0);
|
||
}
|
||
}
|
||
|
||
/* If we ended up creating a new inferior, call post_create_inferior to inform
|
||
the various subcomponents. */
|
||
if (child_inf != nullptr)
|
||
{
|
||
/* If FOLLOW_CHILD, we leave CHILD_INF as the current inferior
|
||
(do not restore the parent as the current inferior). */
|
||
gdb::optional<scoped_restore_current_thread> maybe_restore;
|
||
|
||
if (!follow_child)
|
||
maybe_restore.emplace ();
|
||
|
||
switch_to_thread (*child_inf->threads ().begin ());
|
||
post_create_inferior (0);
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Tell the target to follow the fork we're stopped at. Returns true
|
||
if the inferior should be resumed; false, if the target for some
|
||
reason decided it's best not to resume. */
|
||
|
||
static bool
|
||
follow_fork ()
|
||
{
|
||
bool follow_child = (follow_fork_mode_string == follow_fork_mode_child);
|
||
bool should_resume = true;
|
||
|
||
/* Copy user stepping state to the new inferior thread. FIXME: the
|
||
followed fork child thread should have a copy of most of the
|
||
parent thread structure's run control related fields, not just these.
|
||
Initialized to avoid "may be used uninitialized" warnings from gcc. */
|
||
struct breakpoint *step_resume_breakpoint = NULL;
|
||
struct breakpoint *exception_resume_breakpoint = NULL;
|
||
CORE_ADDR step_range_start = 0;
|
||
CORE_ADDR step_range_end = 0;
|
||
int current_line = 0;
|
||
symtab *current_symtab = NULL;
|
||
struct frame_id step_frame_id = { 0 };
|
||
|
||
if (!non_stop)
|
||
{
|
||
process_stratum_target *wait_target;
|
||
ptid_t wait_ptid;
|
||
struct target_waitstatus wait_status;
|
||
|
||
/* Get the last target status returned by target_wait(). */
|
||
get_last_target_status (&wait_target, &wait_ptid, &wait_status);
|
||
|
||
/* If not stopped at a fork event, then there's nothing else to
|
||
do. */
|
||
if (wait_status.kind () != TARGET_WAITKIND_FORKED
|
||
&& wait_status.kind () != TARGET_WAITKIND_VFORKED)
|
||
return 1;
|
||
|
||
/* Check if we switched over from WAIT_PTID, since the event was
|
||
reported. */
|
||
if (wait_ptid != minus_one_ptid
|
||
&& (current_inferior ()->process_target () != wait_target
|
||
|| inferior_ptid != wait_ptid))
|
||
{
|
||
/* We did. Switch back to WAIT_PTID thread, to tell the
|
||
target to follow it (in either direction). We'll
|
||
afterwards refuse to resume, and inform the user what
|
||
happened. */
|
||
thread_info *wait_thread = find_thread_ptid (wait_target, wait_ptid);
|
||
switch_to_thread (wait_thread);
|
||
should_resume = false;
|
||
}
|
||
}
|
||
|
||
thread_info *tp = inferior_thread ();
|
||
|
||
/* If there were any forks/vforks that were caught and are now to be
|
||
followed, then do so now. */
|
||
switch (tp->pending_follow.kind ())
|
||
{
|
||
case TARGET_WAITKIND_FORKED:
|
||
case TARGET_WAITKIND_VFORKED:
|
||
{
|
||
ptid_t parent, child;
|
||
std::unique_ptr<struct thread_fsm> thread_fsm;
|
||
|
||
/* If the user did a next/step, etc, over a fork call,
|
||
preserve the stepping state in the fork child. */
|
||
if (follow_child && should_resume)
|
||
{
|
||
step_resume_breakpoint = clone_momentary_breakpoint
|
||
(tp->control.step_resume_breakpoint);
|
||
step_range_start = tp->control.step_range_start;
|
||
step_range_end = tp->control.step_range_end;
|
||
current_line = tp->current_line;
|
||
current_symtab = tp->current_symtab;
|
||
step_frame_id = tp->control.step_frame_id;
|
||
exception_resume_breakpoint
|
||
= clone_momentary_breakpoint (tp->control.exception_resume_breakpoint);
|
||
thread_fsm = tp->release_thread_fsm ();
|
||
|
||
/* For now, delete the parent's sr breakpoint, otherwise,
|
||
parent/child sr breakpoints are considered duplicates,
|
||
and the child version will not be installed. Remove
|
||
this when the breakpoints module becomes aware of
|
||
inferiors and address spaces. */
|
||
delete_step_resume_breakpoint (tp);
|
||
tp->control.step_range_start = 0;
|
||
tp->control.step_range_end = 0;
|
||
tp->control.step_frame_id = null_frame_id;
|
||
delete_exception_resume_breakpoint (tp);
|
||
}
|
||
|
||
parent = inferior_ptid;
|
||
child = tp->pending_follow.child_ptid ();
|
||
|
||
/* If handling a vfork, stop all the inferior's threads, they will be
|
||
restarted when the vfork shared region is complete. */
|
||
if (tp->pending_follow.kind () == TARGET_WAITKIND_VFORKED
|
||
&& target_is_non_stop_p ())
|
||
stop_all_threads ("handling vfork", tp->inf);
|
||
|
||
process_stratum_target *parent_targ = tp->inf->process_target ();
|
||
/* Set up inferior(s) as specified by the caller, and tell the
|
||
target to do whatever is necessary to follow either parent
|
||
or child. */
|
||
if (follow_fork_inferior (follow_child, detach_fork))
|
||
{
|
||
/* Target refused to follow, or there's some other reason
|
||
we shouldn't resume. */
|
||
should_resume = 0;
|
||
}
|
||
else
|
||
{
|
||
/* This makes sure we don't try to apply the "Switched
|
||
over from WAIT_PID" logic above. */
|
||
nullify_last_target_wait_ptid ();
|
||
|
||
/* If we followed the child, switch to it... */
|
||
if (follow_child)
|
||
{
|
||
thread_info *child_thr = find_thread_ptid (parent_targ, child);
|
||
switch_to_thread (child_thr);
|
||
|
||
/* ... and preserve the stepping state, in case the
|
||
user was stepping over the fork call. */
|
||
if (should_resume)
|
||
{
|
||
tp = inferior_thread ();
|
||
tp->control.step_resume_breakpoint
|
||
= step_resume_breakpoint;
|
||
tp->control.step_range_start = step_range_start;
|
||
tp->control.step_range_end = step_range_end;
|
||
tp->current_line = current_line;
|
||
tp->current_symtab = current_symtab;
|
||
tp->control.step_frame_id = step_frame_id;
|
||
tp->control.exception_resume_breakpoint
|
||
= exception_resume_breakpoint;
|
||
tp->set_thread_fsm (std::move (thread_fsm));
|
||
}
|
||
else
|
||
{
|
||
/* If we get here, it was because we're trying to
|
||
resume from a fork catchpoint, but, the user
|
||
has switched threads away from the thread that
|
||
forked. In that case, the resume command
|
||
issued is most likely not applicable to the
|
||
child, so just warn, and refuse to resume. */
|
||
warning (_("Not resuming: switched threads "
|
||
"before following fork child."));
|
||
}
|
||
|
||
/* Reset breakpoints in the child as appropriate. */
|
||
follow_inferior_reset_breakpoints ();
|
||
}
|
||
}
|
||
}
|
||
break;
|
||
case TARGET_WAITKIND_SPURIOUS:
|
||
/* Nothing to follow. */
|
||
break;
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
"Unexpected pending_follow.kind %d\n",
|
||
tp->pending_follow.kind ());
|
||
break;
|
||
}
|
||
|
||
return should_resume;
|
||
}
|
||
|
||
static void
|
||
follow_inferior_reset_breakpoints (void)
|
||
{
|
||
struct thread_info *tp = inferior_thread ();
|
||
|
||
/* Was there a step_resume breakpoint? (There was if the user
|
||
did a "next" at the fork() call.) If so, explicitly reset its
|
||
thread number. Cloned step_resume breakpoints are disabled on
|
||
creation, so enable it here now that it is associated with the
|
||
correct thread.
|
||
|
||
step_resumes are a form of bp that are made to be per-thread.
|
||
Since we created the step_resume bp when the parent process
|
||
was being debugged, and now are switching to the child process,
|
||
from the breakpoint package's viewpoint, that's a switch of
|
||
"threads". We must update the bp's notion of which thread
|
||
it is for, or it'll be ignored when it triggers. */
|
||
|
||
if (tp->control.step_resume_breakpoint)
|
||
{
|
||
breakpoint_re_set_thread (tp->control.step_resume_breakpoint);
|
||
tp->control.step_resume_breakpoint->loc->enabled = 1;
|
||
}
|
||
|
||
/* Treat exception_resume breakpoints like step_resume breakpoints. */
|
||
if (tp->control.exception_resume_breakpoint)
|
||
{
|
||
breakpoint_re_set_thread (tp->control.exception_resume_breakpoint);
|
||
tp->control.exception_resume_breakpoint->loc->enabled = 1;
|
||
}
|
||
|
||
/* Reinsert all breakpoints in the child. The user may have set
|
||
breakpoints after catching the fork, in which case those
|
||
were never set in the child, but only in the parent. This makes
|
||
sure the inserted breakpoints match the breakpoint list. */
|
||
|
||
breakpoint_re_set ();
|
||
insert_breakpoints ();
|
||
}
|
||
|
||
/* The child has exited or execed: resume THREAD, a thread of the parent,
|
||
if it was meant to be executing. */
|
||
|
||
static void
|
||
proceed_after_vfork_done (thread_info *thread)
|
||
{
|
||
if (thread->state == THREAD_RUNNING
|
||
&& !thread->executing ()
|
||
&& !thread->stop_requested
|
||
&& thread->stop_signal () == GDB_SIGNAL_0)
|
||
{
|
||
infrun_debug_printf ("resuming vfork parent thread %s",
|
||
thread->ptid.to_string ().c_str ());
|
||
|
||
switch_to_thread (thread);
|
||
clear_proceed_status (0);
|
||
proceed ((CORE_ADDR) -1, GDB_SIGNAL_DEFAULT);
|
||
}
|
||
}
|
||
|
||
/* Called whenever we notice an exec or exit event, to handle
|
||
detaching or resuming a vfork parent. */
|
||
|
||
static void
|
||
handle_vfork_child_exec_or_exit (int exec)
|
||
{
|
||
struct inferior *inf = current_inferior ();
|
||
|
||
if (inf->vfork_parent)
|
||
{
|
||
inferior *resume_parent = nullptr;
|
||
|
||
/* This exec or exit marks the end of the shared memory region
|
||
between the parent and the child. Break the bonds. */
|
||
inferior *vfork_parent = inf->vfork_parent;
|
||
inf->vfork_parent->vfork_child = NULL;
|
||
inf->vfork_parent = NULL;
|
||
|
||
/* If the user wanted to detach from the parent, now is the
|
||
time. */
|
||
if (vfork_parent->pending_detach)
|
||
{
|
||
struct program_space *pspace;
|
||
struct address_space *aspace;
|
||
|
||
/* follow-fork child, detach-on-fork on. */
|
||
|
||
vfork_parent->pending_detach = 0;
|
||
|
||
scoped_restore_current_pspace_and_thread restore_thread;
|
||
|
||
/* We're letting loose of the parent. */
|
||
thread_info *tp = any_live_thread_of_inferior (vfork_parent);
|
||
switch_to_thread (tp);
|
||
|
||
/* We're about to detach from the parent, which implicitly
|
||
removes breakpoints from its address space. There's a
|
||
catch here: we want to reuse the spaces for the child,
|
||
but, parent/child are still sharing the pspace at this
|
||
point, although the exec in reality makes the kernel give
|
||
the child a fresh set of new pages. The problem here is
|
||
that the breakpoints module being unaware of this, would
|
||
likely chose the child process to write to the parent
|
||
address space. Swapping the child temporarily away from
|
||
the spaces has the desired effect. Yes, this is "sort
|
||
of" a hack. */
|
||
|
||
pspace = inf->pspace;
|
||
aspace = inf->aspace;
|
||
inf->aspace = NULL;
|
||
inf->pspace = NULL;
|
||
|
||
if (print_inferior_events)
|
||
{
|
||
std::string pidstr
|
||
= target_pid_to_str (ptid_t (vfork_parent->pid));
|
||
|
||
target_terminal::ours_for_output ();
|
||
|
||
if (exec)
|
||
{
|
||
gdb_printf (_("[Detaching vfork parent %s "
|
||
"after child exec]\n"), pidstr.c_str ());
|
||
}
|
||
else
|
||
{
|
||
gdb_printf (_("[Detaching vfork parent %s "
|
||
"after child exit]\n"), pidstr.c_str ());
|
||
}
|
||
}
|
||
|
||
target_detach (vfork_parent, 0);
|
||
|
||
/* Put it back. */
|
||
inf->pspace = pspace;
|
||
inf->aspace = aspace;
|
||
}
|
||
else if (exec)
|
||
{
|
||
/* We're staying attached to the parent, so, really give the
|
||
child a new address space. */
|
||
inf->pspace = new program_space (maybe_new_address_space ());
|
||
inf->aspace = inf->pspace->aspace;
|
||
inf->removable = 1;
|
||
set_current_program_space (inf->pspace);
|
||
|
||
resume_parent = vfork_parent;
|
||
}
|
||
else
|
||
{
|
||
/* If this is a vfork child exiting, then the pspace and
|
||
aspaces were shared with the parent. Since we're
|
||
reporting the process exit, we'll be mourning all that is
|
||
found in the address space, and switching to null_ptid,
|
||
preparing to start a new inferior. But, since we don't
|
||
want to clobber the parent's address/program spaces, we
|
||
go ahead and create a new one for this exiting
|
||
inferior. */
|
||
|
||
/* Switch to no-thread while running clone_program_space, so
|
||
that clone_program_space doesn't want to read the
|
||
selected frame of a dead process. */
|
||
scoped_restore_current_thread restore_thread;
|
||
switch_to_no_thread ();
|
||
|
||
inf->pspace = new program_space (maybe_new_address_space ());
|
||
inf->aspace = inf->pspace->aspace;
|
||
set_current_program_space (inf->pspace);
|
||
inf->removable = 1;
|
||
inf->symfile_flags = SYMFILE_NO_READ;
|
||
clone_program_space (inf->pspace, vfork_parent->pspace);
|
||
|
||
resume_parent = vfork_parent;
|
||
}
|
||
|
||
gdb_assert (current_program_space == inf->pspace);
|
||
|
||
if (non_stop && resume_parent != nullptr)
|
||
{
|
||
/* If the user wanted the parent to be running, let it go
|
||
free now. */
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
infrun_debug_printf ("resuming vfork parent process %d",
|
||
resume_parent->pid);
|
||
|
||
for (thread_info *thread : resume_parent->threads ())
|
||
proceed_after_vfork_done (thread);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Handle TARGET_WAITKIND_VFORK_DONE. */
|
||
|
||
static void
|
||
handle_vfork_done (thread_info *event_thread)
|
||
{
|
||
/* We only care about this event if inferior::thread_waiting_for_vfork_done is
|
||
set, that is if we are waiting for a vfork child not under our control
|
||
(because we detached it) to exec or exit.
|
||
|
||
If an inferior has vforked and we are debugging the child, we don't use
|
||
the vfork-done event to get notified about the end of the shared address
|
||
space window. We rely instead on the child's exec or exit event, and the
|
||
inferior::vfork_{parent,child} fields are used instead. See
|
||
handle_vfork_child_exec_or_exit for that. */
|
||
if (event_thread->inf->thread_waiting_for_vfork_done == nullptr)
|
||
{
|
||
infrun_debug_printf ("not waiting for a vfork-done event");
|
||
return;
|
||
}
|
||
|
||
INFRUN_SCOPED_DEBUG_ENTER_EXIT;
|
||
|
||
/* We stopped all threads (other than the vforking thread) of the inferior in
|
||
follow_fork and kept them stopped until now. It should therefore not be
|
||
possible for another thread to have reported a vfork during that window.
|
||
If THREAD_WAITING_FOR_VFORK_DONE is set, it has to be the same thread whose
|
||
vfork-done we are handling right now. */
|
||
gdb_assert (event_thread->inf->thread_waiting_for_vfork_done == event_thread);
|
||
|
||
event_thread->inf->thread_waiting_for_vfork_done = nullptr;
|
||
event_thread->inf->pspace->breakpoints_not_allowed = 0;
|
||
|
||
/* On non-stop targets, we stopped all the inferior's threads in follow_fork,
|
||
resume them now. On all-stop targets, everything that needs to be resumed
|
||
will be when we resume the event thread. */
|
||
if (target_is_non_stop_p ())
|
||
{
|
||
/* restart_threads and start_step_over may change the current thread, make
|
||
sure we leave the event thread as the current thread. */
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
insert_breakpoints ();
|
||
restart_threads (event_thread, event_thread->inf);
|
||
start_step_over ();
|
||
}
|
||
}
|
||
|
||
/* Enum strings for "set|show follow-exec-mode". */
|
||
|
||
static const char follow_exec_mode_new[] = "new";
|
||
static const char follow_exec_mode_same[] = "same";
|
||
static const char *const follow_exec_mode_names[] =
|
||
{
|
||
follow_exec_mode_new,
|
||
follow_exec_mode_same,
|
||
NULL,
|
||
};
|
||
|
||
static const char *follow_exec_mode_string = follow_exec_mode_same;
|
||
static void
|
||
show_follow_exec_mode_string (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
gdb_printf (file, _("Follow exec mode is \"%s\".\n"), value);
|
||
}
|
||
|
||
/* EXEC_FILE_TARGET is assumed to be non-NULL. */
|
||
|
||
static void
|
||
follow_exec (ptid_t ptid, const char *exec_file_target)
|
||
{
|
||
int pid = ptid.pid ();
|
||
ptid_t process_ptid;
|
||
|
||
/* Switch terminal for any messages produced e.g. by
|
||
breakpoint_re_set. */
|
||
target_terminal::ours_for_output ();
|
||
|
||
/* This is an exec event that we actually wish to pay attention to.
|
||
Refresh our symbol table to the newly exec'd program, remove any
|
||
momentary bp's, etc.
|
||
|
||
If there are breakpoints, they aren't really inserted now,
|
||
since the exec() transformed our inferior into a fresh set
|
||
of instructions.
|
||
|
||
We want to preserve symbolic breakpoints on the list, since
|
||
we have hopes that they can be reset after the new a.out's
|
||
symbol table is read.
|
||
|
||
However, any "raw" breakpoints must be removed from the list
|
||
(e.g., the solib bp's), since their address is probably invalid
|
||
now.
|
||
|
||
And, we DON'T want to call delete_breakpoints() here, since
|
||
that may write the bp's "shadow contents" (the instruction
|
||
value that was overwritten with a TRAP instruction). Since
|
||
we now have a new a.out, those shadow contents aren't valid. */
|
||
|
||
mark_breakpoints_out ();
|
||
|
||
/* The target reports the exec event to the main thread, even if
|
||
some other thread does the exec, and even if the main thread was
|
||
stopped or already gone. We may still have non-leader threads of
|
||
the process on our list. E.g., on targets that don't have thread
|
||
exit events (like remote); or on native Linux in non-stop mode if
|
||
there were only two threads in the inferior and the non-leader
|
||
one is the one that execs (and nothing forces an update of the
|
||
thread list up to here). When debugging remotely, it's best to
|
||
avoid extra traffic, when possible, so avoid syncing the thread
|
||
list with the target, and instead go ahead and delete all threads
|
||
of the process but one that reported the event. Note this must
|
||
be done before calling update_breakpoints_after_exec, as
|
||
otherwise clearing the threads' resources would reference stale
|
||
thread breakpoints -- it may have been one of these threads that
|
||
stepped across the exec. We could just clear their stepping
|
||
states, but as long as we're iterating, might as well delete
|
||
them. Deleting them now rather than at the next user-visible
|
||
stop provides a nicer sequence of events for user and MI
|
||
notifications. */
|
||
for (thread_info *th : all_threads_safe ())
|
||
if (th->ptid.pid () == pid && th->ptid != ptid)
|
||
delete_thread (th);
|
||
|
||
/* We also need to clear any left over stale state for the
|
||
leader/event thread. E.g., if there was any step-resume
|
||
breakpoint or similar, it's gone now. We cannot truly
|
||
step-to-next statement through an exec(). */
|
||
thread_info *th = inferior_thread ();
|
||
th->control.step_resume_breakpoint = NULL;
|
||
th->control.exception_resume_breakpoint = NULL;
|
||
th->control.single_step_breakpoints = NULL;
|
||
th->control.step_range_start = 0;
|
||
th->control.step_range_end = 0;
|
||
|
||
/* The user may have had the main thread held stopped in the
|
||
previous image (e.g., schedlock on, or non-stop). Release
|
||
it now. */
|
||
th->stop_requested = 0;
|
||
|
||
update_breakpoints_after_exec ();
|
||
|
||
/* What is this a.out's name? */
|
||
process_ptid = ptid_t (pid);
|
||
gdb_printf (_("%s is executing new program: %s\n"),
|
||
target_pid_to_str (process_ptid).c_str (),
|
||
exec_file_target);
|
||
|
||
/* We've followed the inferior through an exec. Therefore, the
|
||
inferior has essentially been killed & reborn. */
|
||
|
||
breakpoint_init_inferior (inf_execd);
|
||
|
||
gdb::unique_xmalloc_ptr<char> exec_file_host
|
||
= exec_file_find (exec_file_target, NULL);
|
||
|
||
/* If we were unable to map the executable target pathname onto a host
|
||
pathname, tell the user that. Otherwise GDB's subsequent behavior
|
||
is confusing. Maybe it would even be better to stop at this point
|
||
so that the user can specify a file manually before continuing. */
|
||
if (exec_file_host == NULL)
|
||
warning (_("Could not load symbols for executable %s.\n"
|
||
"Do you need \"set sysroot\"?"),
|
||
exec_file_target);
|
||
|
||
/* Reset the shared library package. This ensures that we get a
|
||
shlib event when the child reaches "_start", at which point the
|
||
dld will have had a chance to initialize the child. */
|
||
/* Also, loading a symbol file below may trigger symbol lookups, and
|
||
we don't want those to be satisfied by the libraries of the
|
||
previous incarnation of this process. */
|
||
no_shared_libraries (NULL, 0);
|
||
|
||
struct inferior *inf = current_inferior ();
|
||
|
||
if (follow_exec_mode_string == follow_exec_mode_new)
|
||
{
|
||
/* The user wants to keep the old inferior and program spaces
|
||
around. Create a new fresh one, and switch to it. */
|
||
|
||
/* Do exit processing for the original inferior before setting the new
|
||
inferior's pid. Having two inferiors with the same pid would confuse
|
||
find_inferior_p(t)id. Transfer the terminal state and info from the
|
||
old to the new inferior. */
|
||
inferior *new_inferior = add_inferior_with_spaces ();
|
||
|
||
swap_terminal_info (new_inferior, inf);
|
||
exit_inferior_silent (inf);
|
||
|
||
new_inferior->pid = pid;
|
||
target_follow_exec (new_inferior, ptid, exec_file_target);
|
||
|
||
/* We continue with the new inferior. */
|
||
inf = new_inferior;
|
||
}
|
||
else
|
||
{
|
||
/* The old description may no longer be fit for the new image.
|
||
E.g, a 64-bit process exec'ed a 32-bit process. Clear the
|
||
old description; we'll read a new one below. No need to do
|
||
this on "follow-exec-mode new", as the old inferior stays
|
||
around (its description is later cleared/refetched on
|
||
restart). */
|
||
target_clear_description ();
|
||
target_follow_exec (inf, ptid, exec_file_target);
|
||
}
|
||
|
||
gdb_assert (current_inferior () == inf);
|
||
gdb_assert (current_program_space == inf->pspace);
|
||
|
||
/* Attempt to open the exec file. SYMFILE_DEFER_BP_RESET is used
|
||
because the proper displacement for a PIE (Position Independent
|
||
Executable) main symbol file will only be computed by
|
||
solib_create_inferior_hook below. breakpoint_re_set would fail
|
||
to insert the breakpoints with the zero displacement. */
|
||
try_open_exec_file (exec_file_host.get (), inf, SYMFILE_DEFER_BP_RESET);
|
||
|
||
/* If the target can specify a description, read it. Must do this
|
||
after flipping to the new executable (because the target supplied
|
||
description must be compatible with the executable's
|
||
architecture, and the old executable may e.g., be 32-bit, while
|
||
the new one 64-bit), and before anything involving memory or
|
||
registers. */
|
||
target_find_description ();
|
||
|
||
gdb::observers::inferior_execd.notify (inf);
|
||
|
||
breakpoint_re_set ();
|
||
|
||
/* Reinsert all breakpoints. (Those which were symbolic have
|
||
been reset to the proper address in the new a.out, thanks
|
||
to symbol_file_command...). */
|
||
insert_breakpoints ();
|
||
|
||
/* The next resume of this inferior should bring it to the shlib
|
||
startup breakpoints. (If the user had also set bp's on
|
||
"main" from the old (parent) process, then they'll auto-
|
||
matically get reset there in the new process.). */
|
||
}
|
||
|
||
/* The chain of threads that need to do a step-over operation to get
|
||
past e.g., a breakpoint. What technique is used to step over the
|
||
breakpoint/watchpoint does not matter -- all threads end up in the
|
||
same queue, to maintain rough temporal order of execution, in order
|
||
to avoid starvation, otherwise, we could e.g., find ourselves
|
||
constantly stepping the same couple threads past their breakpoints
|
||
over and over, if the single-step finish fast enough. */
|
||
thread_step_over_list global_thread_step_over_list;
|
||
|
||
/* Bit flags indicating what the thread needs to step over. */
|
||
|
||
enum step_over_what_flag
|
||
{
|
||
/* Step over a breakpoint. */
|
||
STEP_OVER_BREAKPOINT = 1,
|
||
|
||
/* Step past a non-continuable watchpoint, in order to let the
|
||
instruction execute so we can evaluate the watchpoint
|
||
expression. */
|
||
STEP_OVER_WATCHPOINT = 2
|
||
};
|
||
DEF_ENUM_FLAGS_TYPE (enum step_over_what_flag, step_over_what);
|
||
|
||
/* Info about an instruction that is being stepped over. */
|
||
|
||
struct step_over_info
|
||
{
|
||
/* If we're stepping past a breakpoint, this is the address space
|
||
and address of the instruction the breakpoint is set at. We'll
|
||
skip inserting all breakpoints here. Valid iff ASPACE is
|
||
non-NULL. */
|
||
const address_space *aspace = nullptr;
|
||
CORE_ADDR address = 0;
|
||
|
||
/* The instruction being stepped over triggers a nonsteppable
|
||
watchpoint. If true, we'll skip inserting watchpoints. */
|
||
int nonsteppable_watchpoint_p = 0;
|
||
|
||
/* The thread's global number. */
|
||
int thread = -1;
|
||
};
|
||
|
||
/* The step-over info of the location that is being stepped over.
|
||
|
||
Note that with async/breakpoint always-inserted mode, a user might
|
||
set a new breakpoint/watchpoint/etc. exactly while a breakpoint is
|
||
being stepped over. As setting a new breakpoint inserts all
|
||
breakpoints, we need to make sure the breakpoint being stepped over
|
||
isn't inserted then. We do that by only clearing the step-over
|
||
info when the step-over is actually finished (or aborted).
|
||
|
||
Presently GDB can only step over one breakpoint at any given time.
|
||
Given threads that can't run code in the same address space as the
|
||
breakpoint's can't really miss the breakpoint, GDB could be taught
|
||
to step-over at most one breakpoint per address space (so this info
|
||
could move to the address space object if/when GDB is extended).
|
||
The set of breakpoints being stepped over will normally be much
|
||
smaller than the set of all breakpoints, so a flag in the
|
||
breakpoint location structure would be wasteful. A separate list
|
||
also saves complexity and run-time, as otherwise we'd have to go
|
||
through all breakpoint locations clearing their flag whenever we
|
||
start a new sequence. Similar considerations weigh against storing
|
||
this info in the thread object. Plus, not all step overs actually
|
||
have breakpoint locations -- e.g., stepping past a single-step
|
||
breakpoint, or stepping to complete a non-continuable
|
||
watchpoint. */
|
||
static struct step_over_info step_over_info;
|
||
|
||
/* Record the address of the breakpoint/instruction we're currently
|
||
stepping over.
|
||
N.B. We record the aspace and address now, instead of say just the thread,
|
||
because when we need the info later the thread may be running. */
|
||
|
||
static void
|
||
set_step_over_info (const address_space *aspace, CORE_ADDR address,
|
||
int nonsteppable_watchpoint_p,
|
||
int thread)
|
||
{
|
||
step_over_info.aspace = aspace;
|
||
step_over_info.address = address;
|
||
step_over_info.nonsteppable_watchpoint_p = nonsteppable_watchpoint_p;
|
||
step_over_info.thread = thread;
|
||
}
|
||
|
||
/* Called when we're not longer stepping over a breakpoint / an
|
||
instruction, so all breakpoints are free to be (re)inserted. */
|
||
|
||
static void
|
||
clear_step_over_info (void)
|
||
{
|
||
infrun_debug_printf ("clearing step over info");
|
||
step_over_info.aspace = NULL;
|
||
step_over_info.address = 0;
|
||
step_over_info.nonsteppable_watchpoint_p = 0;
|
||
step_over_info.thread = -1;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
int
|
||
stepping_past_instruction_at (struct address_space *aspace,
|
||
CORE_ADDR address)
|
||
{
|
||
return (step_over_info.aspace != NULL
|
||
&& breakpoint_address_match (aspace, address,
|
||
step_over_info.aspace,
|
||
step_over_info.address));
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
int
|
||
thread_is_stepping_over_breakpoint (int thread)
|
||
{
|
||
return (step_over_info.thread != -1
|
||
&& thread == step_over_info.thread);
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
int
|
||
stepping_past_nonsteppable_watchpoint (void)
|
||
{
|
||
return step_over_info.nonsteppable_watchpoint_p;
|
||
}
|
||
|
||
/* Returns true if step-over info is valid. */
|
||
|
||
static bool
|
||
step_over_info_valid_p (void)
|
||
{
|
||
return (step_over_info.aspace != NULL
|
||
|| stepping_past_nonsteppable_watchpoint ());
|
||
}
|
||
|
||
|
||
/* Displaced stepping. */
|
||
|
||
/* In non-stop debugging mode, we must take special care to manage
|
||
breakpoints properly; in particular, the traditional strategy for
|
||
stepping a thread past a breakpoint it has hit is unsuitable.
|
||
'Displaced stepping' is a tactic for stepping one thread past a
|
||
breakpoint it has hit while ensuring that other threads running
|
||
concurrently will hit the breakpoint as they should.
|
||
|
||
The traditional way to step a thread T off a breakpoint in a
|
||
multi-threaded program in all-stop mode is as follows:
|
||
|
||
a0) Initially, all threads are stopped, and breakpoints are not
|
||
inserted.
|
||
a1) We single-step T, leaving breakpoints uninserted.
|
||
a2) We insert breakpoints, and resume all threads.
|
||
|
||
In non-stop debugging, however, this strategy is unsuitable: we
|
||
don't want to have to stop all threads in the system in order to
|
||
continue or step T past a breakpoint. Instead, we use displaced
|
||
stepping:
|
||
|
||
n0) Initially, T is stopped, other threads are running, and
|
||
breakpoints are inserted.
|
||
n1) We copy the instruction "under" the breakpoint to a separate
|
||
location, outside the main code stream, making any adjustments
|
||
to the instruction, register, and memory state as directed by
|
||
T's architecture.
|
||
n2) We single-step T over the instruction at its new location.
|
||
n3) We adjust the resulting register and memory state as directed
|
||
by T's architecture. This includes resetting T's PC to point
|
||
back into the main instruction stream.
|
||
n4) We resume T.
|
||
|
||
This approach depends on the following gdbarch methods:
|
||
|
||
- gdbarch_max_insn_length and gdbarch_displaced_step_location
|
||
indicate where to copy the instruction, and how much space must
|
||
be reserved there. We use these in step n1.
|
||
|
||
- gdbarch_displaced_step_copy_insn copies a instruction to a new
|
||
address, and makes any necessary adjustments to the instruction,
|
||
register contents, and memory. We use this in step n1.
|
||
|
||
- gdbarch_displaced_step_fixup adjusts registers and memory after
|
||
we have successfully single-stepped the instruction, to yield the
|
||
same effect the instruction would have had if we had executed it
|
||
at its original address. We use this in step n3.
|
||
|
||
The gdbarch_displaced_step_copy_insn and
|
||
gdbarch_displaced_step_fixup functions must be written so that
|
||
copying an instruction with gdbarch_displaced_step_copy_insn,
|
||
single-stepping across the copied instruction, and then applying
|
||
gdbarch_displaced_insn_fixup should have the same effects on the
|
||
thread's memory and registers as stepping the instruction in place
|
||
would have. Exactly which responsibilities fall to the copy and
|
||
which fall to the fixup is up to the author of those functions.
|
||
|
||
See the comments in gdbarch.sh for details.
|
||
|
||
Note that displaced stepping and software single-step cannot
|
||
currently be used in combination, although with some care I think
|
||
they could be made to. Software single-step works by placing
|
||
breakpoints on all possible subsequent instructions; if the
|
||
displaced instruction is a PC-relative jump, those breakpoints
|
||
could fall in very strange places --- on pages that aren't
|
||
executable, or at addresses that are not proper instruction
|
||
boundaries. (We do generally let other threads run while we wait
|
||
to hit the software single-step breakpoint, and they might
|
||
encounter such a corrupted instruction.) One way to work around
|
||
this would be to have gdbarch_displaced_step_copy_insn fully
|
||
simulate the effect of PC-relative instructions (and return NULL)
|
||
on architectures that use software single-stepping.
|
||
|
||
In non-stop mode, we can have independent and simultaneous step
|
||
requests, so more than one thread may need to simultaneously step
|
||
over a breakpoint. The current implementation assumes there is
|
||
only one scratch space per process. In this case, we have to
|
||
serialize access to the scratch space. If thread A wants to step
|
||
over a breakpoint, but we are currently waiting for some other
|
||
thread to complete a displaced step, we leave thread A stopped and
|
||
place it in the displaced_step_request_queue. Whenever a displaced
|
||
step finishes, we pick the next thread in the queue and start a new
|
||
displaced step operation on it. See displaced_step_prepare and
|
||
displaced_step_finish for details. */
|
||
|
||
/* Return true if THREAD is doing a displaced step. */
|
||
|
||
static bool
|
||
displaced_step_in_progress_thread (thread_info *thread)
|
||
{
|
||
gdb_assert (thread != NULL);
|
||
|
||
return thread->displaced_step_state.in_progress ();
|
||
}
|
||
|
||
/* Return true if INF has a thread doing a displaced step. */
|
||
|
||
static bool
|
||
displaced_step_in_progress (inferior *inf)
|
||
{
|
||
return inf->displaced_step_state.in_progress_count > 0;
|
||
}
|
||
|
||
/* Return true if any thread is doing a displaced step. */
|
||
|
||
static bool
|
||
displaced_step_in_progress_any_thread ()
|
||
{
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
if (displaced_step_in_progress (inf))
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
static void
|
||
infrun_inferior_exit (struct inferior *inf)
|
||
{
|
||
inf->displaced_step_state.reset ();
|
||
inf->thread_waiting_for_vfork_done = nullptr;
|
||
}
|
||
|
||
static void
|
||
infrun_inferior_execd (inferior *inf)
|
||
{
|
||
/* If some threads where was doing a displaced step in this inferior at the
|
||
moment of the exec, they no longer exist. Even if the exec'ing thread
|
||
doing a displaced step, we don't want to to any fixup nor restore displaced
|
||
stepping buffer bytes. */
|
||
inf->displaced_step_state.reset ();
|
||
|
||
for (thread_info *thread : inf->threads ())
|
||
thread->displaced_step_state.reset ();
|
||
|
||
/* Since an in-line step is done with everything else stopped, if there was
|
||
one in progress at the time of the exec, it must have been the exec'ing
|
||
thread. */
|
||
clear_step_over_info ();
|
||
|
||
inf->thread_waiting_for_vfork_done = nullptr;
|
||
}
|
||
|
||
/* If ON, and the architecture supports it, GDB will use displaced
|
||
stepping to step over breakpoints. If OFF, or if the architecture
|
||
doesn't support it, GDB will instead use the traditional
|
||
hold-and-step approach. If AUTO (which is the default), GDB will
|
||
decide which technique to use to step over breakpoints depending on
|
||
whether the target works in a non-stop way (see use_displaced_stepping). */
|
||
|
||
static enum auto_boolean can_use_displaced_stepping = AUTO_BOOLEAN_AUTO;
|
||
|
||
static void
|
||
show_can_use_displaced_stepping (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c,
|
||
const char *value)
|
||
{
|
||
if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO)
|
||
gdb_printf (file,
|
||
_("Debugger's willingness to use displaced stepping "
|
||
"to step over breakpoints is %s (currently %s).\n"),
|
||
value, target_is_non_stop_p () ? "on" : "off");
|
||
else
|
||
gdb_printf (file,
|
||
_("Debugger's willingness to use displaced stepping "
|
||
"to step over breakpoints is %s.\n"), value);
|
||
}
|
||
|
||
/* Return true if the gdbarch implements the required methods to use
|
||
displaced stepping. */
|
||
|
||
static bool
|
||
gdbarch_supports_displaced_stepping (gdbarch *arch)
|
||
{
|
||
/* Only check for the presence of `prepare`. The gdbarch verification ensures
|
||
that if `prepare` is provided, so is `finish`. */
|
||
return gdbarch_displaced_step_prepare_p (arch);
|
||
}
|
||
|
||
/* Return non-zero if displaced stepping can/should be used to step
|
||
over breakpoints of thread TP. */
|
||
|
||
static bool
|
||
use_displaced_stepping (thread_info *tp)
|
||
{
|
||
/* If the user disabled it explicitly, don't use displaced stepping. */
|
||
if (can_use_displaced_stepping == AUTO_BOOLEAN_FALSE)
|
||
return false;
|
||
|
||
/* If "auto", only use displaced stepping if the target operates in a non-stop
|
||
way. */
|
||
if (can_use_displaced_stepping == AUTO_BOOLEAN_AUTO
|
||
&& !target_is_non_stop_p ())
|
||
return false;
|
||
|
||
gdbarch *gdbarch = get_thread_regcache (tp)->arch ();
|
||
|
||
/* If the architecture doesn't implement displaced stepping, don't use
|
||
it. */
|
||
if (!gdbarch_supports_displaced_stepping (gdbarch))
|
||
return false;
|
||
|
||
/* If recording, don't use displaced stepping. */
|
||
if (find_record_target () != nullptr)
|
||
return false;
|
||
|
||
/* If displaced stepping failed before for this inferior, don't bother trying
|
||
again. */
|
||
if (tp->inf->displaced_step_state.failed_before)
|
||
return false;
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Simple function wrapper around displaced_step_thread_state::reset. */
|
||
|
||
static void
|
||
displaced_step_reset (displaced_step_thread_state *displaced)
|
||
{
|
||
displaced->reset ();
|
||
}
|
||
|
||
/* A cleanup that wraps displaced_step_reset. We use this instead of, say,
|
||
SCOPE_EXIT, because it needs to be discardable with "cleanup.release ()". */
|
||
|
||
using displaced_step_reset_cleanup = FORWARD_SCOPE_EXIT (displaced_step_reset);
|
||
|
||
/* See infrun.h. */
|
||
|
||
std::string
|
||
displaced_step_dump_bytes (const gdb_byte *buf, size_t len)
|
||
{
|
||
std::string ret;
|
||
|
||
for (size_t i = 0; i < len; i++)
|
||
{
|
||
if (i == 0)
|
||
ret += string_printf ("%02x", buf[i]);
|
||
else
|
||
ret += string_printf (" %02x", buf[i]);
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Prepare to single-step, using displaced stepping.
|
||
|
||
Note that we cannot use displaced stepping when we have a signal to
|
||
deliver. If we have a signal to deliver and an instruction to step
|
||
over, then after the step, there will be no indication from the
|
||
target whether the thread entered a signal handler or ignored the
|
||
signal and stepped over the instruction successfully --- both cases
|
||
result in a simple SIGTRAP. In the first case we mustn't do a
|
||
fixup, and in the second case we must --- but we can't tell which.
|
||
Comments in the code for 'random signals' in handle_inferior_event
|
||
explain how we handle this case instead.
|
||
|
||
Returns DISPLACED_STEP_PREPARE_STATUS_OK if preparing was successful -- this
|
||
thread is going to be stepped now; DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE
|
||
if displaced stepping this thread got queued; or
|
||
DISPLACED_STEP_PREPARE_STATUS_CANT if this instruction can't be displaced
|
||
stepped. */
|
||
|
||
static displaced_step_prepare_status
|
||
displaced_step_prepare_throw (thread_info *tp)
|
||
{
|
||
regcache *regcache = get_thread_regcache (tp);
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
displaced_step_thread_state &disp_step_thread_state
|
||
= tp->displaced_step_state;
|
||
|
||
/* We should never reach this function if the architecture does not
|
||
support displaced stepping. */
|
||
gdb_assert (gdbarch_supports_displaced_stepping (gdbarch));
|
||
|
||
/* Nor if the thread isn't meant to step over a breakpoint. */
|
||
gdb_assert (tp->control.trap_expected);
|
||
|
||
/* Disable range stepping while executing in the scratch pad. We
|
||
want a single-step even if executing the displaced instruction in
|
||
the scratch buffer lands within the stepping range (e.g., a
|
||
jump/branch). */
|
||
tp->control.may_range_step = 0;
|
||
|
||
/* We are about to start a displaced step for this thread. If one is already
|
||
in progress, something's wrong. */
|
||
gdb_assert (!disp_step_thread_state.in_progress ());
|
||
|
||
if (tp->inf->displaced_step_state.unavailable)
|
||
{
|
||
/* The gdbarch tells us it's not worth asking to try a prepare because
|
||
it is likely that it will return unavailable, so don't bother asking. */
|
||
|
||
displaced_debug_printf ("deferring step of %s",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
global_thread_step_over_chain_enqueue (tp);
|
||
return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE;
|
||
}
|
||
|
||
displaced_debug_printf ("displaced-stepping %s now",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
switch_to_thread (tp);
|
||
|
||
CORE_ADDR original_pc = regcache_read_pc (regcache);
|
||
CORE_ADDR displaced_pc;
|
||
|
||
displaced_step_prepare_status status
|
||
= gdbarch_displaced_step_prepare (gdbarch, tp, displaced_pc);
|
||
|
||
if (status == DISPLACED_STEP_PREPARE_STATUS_CANT)
|
||
{
|
||
displaced_debug_printf ("failed to prepare (%s)",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
return DISPLACED_STEP_PREPARE_STATUS_CANT;
|
||
}
|
||
else if (status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE)
|
||
{
|
||
/* Not enough displaced stepping resources available, defer this
|
||
request by placing it the queue. */
|
||
|
||
displaced_debug_printf ("not enough resources available, "
|
||
"deferring step of %s",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
global_thread_step_over_chain_enqueue (tp);
|
||
|
||
return DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE;
|
||
}
|
||
|
||
gdb_assert (status == DISPLACED_STEP_PREPARE_STATUS_OK);
|
||
|
||
/* Save the information we need to fix things up if the step
|
||
succeeds. */
|
||
disp_step_thread_state.set (gdbarch);
|
||
|
||
tp->inf->displaced_step_state.in_progress_count++;
|
||
|
||
displaced_debug_printf ("prepared successfully thread=%s, "
|
||
"original_pc=%s, displaced_pc=%s",
|
||
tp->ptid.to_string ().c_str (),
|
||
paddress (gdbarch, original_pc),
|
||
paddress (gdbarch, displaced_pc));
|
||
|
||
return DISPLACED_STEP_PREPARE_STATUS_OK;
|
||
}
|
||
|
||
/* Wrapper for displaced_step_prepare_throw that disabled further
|
||
attempts at displaced stepping if we get a memory error. */
|
||
|
||
static displaced_step_prepare_status
|
||
displaced_step_prepare (thread_info *thread)
|
||
{
|
||
displaced_step_prepare_status status
|
||
= DISPLACED_STEP_PREPARE_STATUS_CANT;
|
||
|
||
try
|
||
{
|
||
status = displaced_step_prepare_throw (thread);
|
||
}
|
||
catch (const gdb_exception_error &ex)
|
||
{
|
||
if (ex.error != MEMORY_ERROR
|
||
&& ex.error != NOT_SUPPORTED_ERROR)
|
||
throw;
|
||
|
||
infrun_debug_printf ("caught exception, disabling displaced stepping: %s",
|
||
ex.what ());
|
||
|
||
/* Be verbose if "set displaced-stepping" is "on", silent if
|
||
"auto". */
|
||
if (can_use_displaced_stepping == AUTO_BOOLEAN_TRUE)
|
||
{
|
||
warning (_("disabling displaced stepping: %s"),
|
||
ex.what ());
|
||
}
|
||
|
||
/* Disable further displaced stepping attempts. */
|
||
thread->inf->displaced_step_state.failed_before = 1;
|
||
}
|
||
|
||
return status;
|
||
}
|
||
|
||
/* If we displaced stepped an instruction successfully, adjust registers and
|
||
memory to yield the same effect the instruction would have had if we had
|
||
executed it at its original address, and return
|
||
DISPLACED_STEP_FINISH_STATUS_OK. If the instruction didn't complete,
|
||
relocate the PC and return DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED.
|
||
|
||
If the thread wasn't displaced stepping, return
|
||
DISPLACED_STEP_FINISH_STATUS_OK as well. */
|
||
|
||
static displaced_step_finish_status
|
||
displaced_step_finish (thread_info *event_thread, enum gdb_signal signal)
|
||
{
|
||
displaced_step_thread_state *displaced = &event_thread->displaced_step_state;
|
||
|
||
/* Was this thread performing a displaced step? */
|
||
if (!displaced->in_progress ())
|
||
return DISPLACED_STEP_FINISH_STATUS_OK;
|
||
|
||
gdb_assert (event_thread->inf->displaced_step_state.in_progress_count > 0);
|
||
event_thread->inf->displaced_step_state.in_progress_count--;
|
||
|
||
/* Fixup may need to read memory/registers. Switch to the thread
|
||
that we're fixing up. Also, target_stopped_by_watchpoint checks
|
||
the current thread, and displaced_step_restore performs ptid-dependent
|
||
memory accesses using current_inferior(). */
|
||
switch_to_thread (event_thread);
|
||
|
||
displaced_step_reset_cleanup cleanup (displaced);
|
||
|
||
/* Do the fixup, and release the resources acquired to do the displaced
|
||
step. */
|
||
return gdbarch_displaced_step_finish (displaced->get_original_gdbarch (),
|
||
event_thread, signal);
|
||
}
|
||
|
||
/* Data to be passed around while handling an event. This data is
|
||
discarded between events. */
|
||
struct execution_control_state
|
||
{
|
||
execution_control_state ()
|
||
{
|
||
this->reset ();
|
||
}
|
||
|
||
void reset ()
|
||
{
|
||
this->target = nullptr;
|
||
this->ptid = null_ptid;
|
||
this->event_thread = nullptr;
|
||
ws = target_waitstatus ();
|
||
stop_func_filled_in = 0;
|
||
stop_func_start = 0;
|
||
stop_func_end = 0;
|
||
stop_func_name = nullptr;
|
||
wait_some_more = 0;
|
||
hit_singlestep_breakpoint = 0;
|
||
}
|
||
|
||
process_stratum_target *target;
|
||
ptid_t ptid;
|
||
/* The thread that got the event, if this was a thread event; NULL
|
||
otherwise. */
|
||
struct thread_info *event_thread;
|
||
|
||
struct target_waitstatus ws;
|
||
int stop_func_filled_in;
|
||
CORE_ADDR stop_func_start;
|
||
CORE_ADDR stop_func_end;
|
||
const char *stop_func_name;
|
||
int wait_some_more;
|
||
|
||
/* True if the event thread hit the single-step breakpoint of
|
||
another thread. Thus the event doesn't cause a stop, the thread
|
||
needs to be single-stepped past the single-step breakpoint before
|
||
we can switch back to the original stepping thread. */
|
||
int hit_singlestep_breakpoint;
|
||
};
|
||
|
||
/* Clear ECS and set it to point at TP. */
|
||
|
||
static void
|
||
reset_ecs (struct execution_control_state *ecs, struct thread_info *tp)
|
||
{
|
||
ecs->reset ();
|
||
ecs->event_thread = tp;
|
||
ecs->ptid = tp->ptid;
|
||
}
|
||
|
||
static void keep_going_pass_signal (struct execution_control_state *ecs);
|
||
static void prepare_to_wait (struct execution_control_state *ecs);
|
||
static bool keep_going_stepped_thread (struct thread_info *tp);
|
||
static step_over_what thread_still_needs_step_over (struct thread_info *tp);
|
||
|
||
/* Are there any pending step-over requests? If so, run all we can
|
||
now and return true. Otherwise, return false. */
|
||
|
||
static bool
|
||
start_step_over (void)
|
||
{
|
||
INFRUN_SCOPED_DEBUG_ENTER_EXIT;
|
||
|
||
/* Don't start a new step-over if we already have an in-line
|
||
step-over operation ongoing. */
|
||
if (step_over_info_valid_p ())
|
||
return false;
|
||
|
||
/* Steal the global thread step over chain. As we try to initiate displaced
|
||
steps, threads will be enqueued in the global chain if no buffers are
|
||
available. If we iterated on the global chain directly, we might iterate
|
||
indefinitely. */
|
||
thread_step_over_list threads_to_step
|
||
= std::move (global_thread_step_over_list);
|
||
|
||
infrun_debug_printf ("stealing global queue of threads to step, length = %d",
|
||
thread_step_over_chain_length (threads_to_step));
|
||
|
||
bool started = false;
|
||
|
||
/* On scope exit (whatever the reason, return or exception), if there are
|
||
threads left in the THREADS_TO_STEP chain, put back these threads in the
|
||
global list. */
|
||
SCOPE_EXIT
|
||
{
|
||
if (threads_to_step.empty ())
|
||
infrun_debug_printf ("step-over queue now empty");
|
||
else
|
||
{
|
||
infrun_debug_printf ("putting back %d threads to step in global queue",
|
||
thread_step_over_chain_length (threads_to_step));
|
||
|
||
global_thread_step_over_chain_enqueue_chain
|
||
(std::move (threads_to_step));
|
||
}
|
||
};
|
||
|
||
thread_step_over_list_safe_range range
|
||
= make_thread_step_over_list_safe_range (threads_to_step);
|
||
|
||
for (thread_info *tp : range)
|
||
{
|
||
struct execution_control_state ecss;
|
||
struct execution_control_state *ecs = &ecss;
|
||
step_over_what step_what;
|
||
int must_be_in_line;
|
||
|
||
gdb_assert (!tp->stop_requested);
|
||
|
||
if (tp->inf->displaced_step_state.unavailable)
|
||
{
|
||
/* The arch told us to not even try preparing another displaced step
|
||
for this inferior. Just leave the thread in THREADS_TO_STEP, it
|
||
will get moved to the global chain on scope exit. */
|
||
continue;
|
||
}
|
||
|
||
if (tp->inf->thread_waiting_for_vfork_done != nullptr)
|
||
{
|
||
/* When we stop all threads, handling a vfork, any thread in the step
|
||
over chain remains there. A user could also try to continue a
|
||
thread stopped at a breakpoint while another thread is waiting for
|
||
a vfork-done event. In any case, we don't want to start a step
|
||
over right now. */
|
||
continue;
|
||
}
|
||
|
||
/* Remove thread from the THREADS_TO_STEP chain. If anything goes wrong
|
||
while we try to prepare the displaced step, we don't add it back to
|
||
the global step over chain. This is to avoid a thread staying in the
|
||
step over chain indefinitely if something goes wrong when resuming it
|
||
If the error is intermittent and it still needs a step over, it will
|
||
get enqueued again when we try to resume it normally. */
|
||
threads_to_step.erase (threads_to_step.iterator_to (*tp));
|
||
|
||
step_what = thread_still_needs_step_over (tp);
|
||
must_be_in_line = ((step_what & STEP_OVER_WATCHPOINT)
|
||
|| ((step_what & STEP_OVER_BREAKPOINT)
|
||
&& !use_displaced_stepping (tp)));
|
||
|
||
/* We currently stop all threads of all processes to step-over
|
||
in-line. If we need to start a new in-line step-over, let
|
||
any pending displaced steps finish first. */
|
||
if (must_be_in_line && displaced_step_in_progress_any_thread ())
|
||
{
|
||
global_thread_step_over_chain_enqueue (tp);
|
||
continue;
|
||
}
|
||
|
||
if (tp->control.trap_expected
|
||
|| tp->resumed ()
|
||
|| tp->executing ())
|
||
{
|
||
internal_error (__FILE__, __LINE__,
|
||
"[%s] has inconsistent state: "
|
||
"trap_expected=%d, resumed=%d, executing=%d\n",
|
||
tp->ptid.to_string ().c_str (),
|
||
tp->control.trap_expected,
|
||
tp->resumed (),
|
||
tp->executing ());
|
||
}
|
||
|
||
infrun_debug_printf ("resuming [%s] for step-over",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
/* keep_going_pass_signal skips the step-over if the breakpoint
|
||
is no longer inserted. In all-stop, we want to keep looking
|
||
for a thread that needs a step-over instead of resuming TP,
|
||
because we wouldn't be able to resume anything else until the
|
||
target stops again. In non-stop, the resume always resumes
|
||
only TP, so it's OK to let the thread resume freely. */
|
||
if (!target_is_non_stop_p () && !step_what)
|
||
continue;
|
||
|
||
switch_to_thread (tp);
|
||
reset_ecs (ecs, tp);
|
||
keep_going_pass_signal (ecs);
|
||
|
||
if (!ecs->wait_some_more)
|
||
error (_("Command aborted."));
|
||
|
||
/* If the thread's step over could not be initiated because no buffers
|
||
were available, it was re-added to the global step over chain. */
|
||
if (tp->resumed ())
|
||
{
|
||
infrun_debug_printf ("[%s] was resumed.",
|
||
tp->ptid.to_string ().c_str ());
|
||
gdb_assert (!thread_is_in_step_over_chain (tp));
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf ("[%s] was NOT resumed.",
|
||
tp->ptid.to_string ().c_str ());
|
||
gdb_assert (thread_is_in_step_over_chain (tp));
|
||
}
|
||
|
||
/* If we started a new in-line step-over, we're done. */
|
||
if (step_over_info_valid_p ())
|
||
{
|
||
gdb_assert (tp->control.trap_expected);
|
||
started = true;
|
||
break;
|
||
}
|
||
|
||
if (!target_is_non_stop_p ())
|
||
{
|
||
/* On all-stop, shouldn't have resumed unless we needed a
|
||
step over. */
|
||
gdb_assert (tp->control.trap_expected
|
||
|| tp->step_after_step_resume_breakpoint);
|
||
|
||
/* With remote targets (at least), in all-stop, we can't
|
||
issue any further remote commands until the program stops
|
||
again. */
|
||
started = true;
|
||
break;
|
||
}
|
||
|
||
/* Either the thread no longer needed a step-over, or a new
|
||
displaced stepping sequence started. Even in the latter
|
||
case, continue looking. Maybe we can also start another
|
||
displaced step on a thread of other process. */
|
||
}
|
||
|
||
return started;
|
||
}
|
||
|
||
/* Update global variables holding ptids to hold NEW_PTID if they were
|
||
holding OLD_PTID. */
|
||
static void
|
||
infrun_thread_ptid_changed (process_stratum_target *target,
|
||
ptid_t old_ptid, ptid_t new_ptid)
|
||
{
|
||
if (inferior_ptid == old_ptid
|
||
&& current_inferior ()->process_target () == target)
|
||
inferior_ptid = new_ptid;
|
||
}
|
||
|
||
|
||
|
||
static const char schedlock_off[] = "off";
|
||
static const char schedlock_on[] = "on";
|
||
static const char schedlock_step[] = "step";
|
||
static const char schedlock_replay[] = "replay";
|
||
static const char *const scheduler_enums[] = {
|
||
schedlock_off,
|
||
schedlock_on,
|
||
schedlock_step,
|
||
schedlock_replay,
|
||
NULL
|
||
};
|
||
static const char *scheduler_mode = schedlock_replay;
|
||
static void
|
||
show_scheduler_mode (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
gdb_printf (file,
|
||
_("Mode for locking scheduler "
|
||
"during execution is \"%s\".\n"),
|
||
value);
|
||
}
|
||
|
||
static void
|
||
set_schedlock_func (const char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
if (!target_can_lock_scheduler ())
|
||
{
|
||
scheduler_mode = schedlock_off;
|
||
error (_("Target '%s' cannot support this command."),
|
||
target_shortname ());
|
||
}
|
||
}
|
||
|
||
/* True if execution commands resume all threads of all processes by
|
||
default; otherwise, resume only threads of the current inferior
|
||
process. */
|
||
bool sched_multi = false;
|
||
|
||
/* Try to setup for software single stepping. Return true if target_resume()
|
||
should use hardware single step.
|
||
|
||
GDBARCH the current gdbarch. */
|
||
|
||
static bool
|
||
maybe_software_singlestep (struct gdbarch *gdbarch)
|
||
{
|
||
bool hw_step = true;
|
||
|
||
if (execution_direction == EXEC_FORWARD
|
||
&& gdbarch_software_single_step_p (gdbarch))
|
||
hw_step = !insert_single_step_breakpoints (gdbarch);
|
||
|
||
return hw_step;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
ptid_t
|
||
user_visible_resume_ptid (int step)
|
||
{
|
||
ptid_t resume_ptid;
|
||
|
||
if (non_stop)
|
||
{
|
||
/* With non-stop mode on, threads are always handled
|
||
individually. */
|
||
resume_ptid = inferior_ptid;
|
||
}
|
||
else if ((scheduler_mode == schedlock_on)
|
||
|| (scheduler_mode == schedlock_step && step))
|
||
{
|
||
/* User-settable 'scheduler' mode requires solo thread
|
||
resume. */
|
||
resume_ptid = inferior_ptid;
|
||
}
|
||
else if ((scheduler_mode == schedlock_replay)
|
||
&& target_record_will_replay (minus_one_ptid, execution_direction))
|
||
{
|
||
/* User-settable 'scheduler' mode requires solo thread resume in replay
|
||
mode. */
|
||
resume_ptid = inferior_ptid;
|
||
}
|
||
else if (!sched_multi && target_supports_multi_process ())
|
||
{
|
||
/* Resume all threads of the current process (and none of other
|
||
processes). */
|
||
resume_ptid = ptid_t (inferior_ptid.pid ());
|
||
}
|
||
else
|
||
{
|
||
/* Resume all threads of all processes. */
|
||
resume_ptid = RESUME_ALL;
|
||
}
|
||
|
||
return resume_ptid;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
process_stratum_target *
|
||
user_visible_resume_target (ptid_t resume_ptid)
|
||
{
|
||
return (resume_ptid == minus_one_ptid && sched_multi
|
||
? NULL
|
||
: current_inferior ()->process_target ());
|
||
}
|
||
|
||
/* Return a ptid representing the set of threads that we will resume,
|
||
in the perspective of the target, assuming run control handling
|
||
does not require leaving some threads stopped (e.g., stepping past
|
||
breakpoint). USER_STEP indicates whether we're about to start the
|
||
target for a stepping command. */
|
||
|
||
static ptid_t
|
||
internal_resume_ptid (int user_step)
|
||
{
|
||
/* In non-stop, we always control threads individually. Note that
|
||
the target may always work in non-stop mode even with "set
|
||
non-stop off", in which case user_visible_resume_ptid could
|
||
return a wildcard ptid. */
|
||
if (target_is_non_stop_p ())
|
||
return inferior_ptid;
|
||
|
||
/* The rest of the function assumes non-stop==off and
|
||
target-non-stop==off.
|
||
|
||
If a thread is waiting for a vfork-done event, it means breakpoints are out
|
||
for this inferior (well, program space in fact). We don't want to resume
|
||
any thread other than the one waiting for vfork done, otherwise these other
|
||
threads could miss breakpoints. So if a thread in the resumption set is
|
||
waiting for a vfork-done event, resume only that thread.
|
||
|
||
The resumption set width depends on whether schedule-multiple is on or off.
|
||
|
||
Note that if the target_resume interface was more flexible, we could be
|
||
smarter here when schedule-multiple is on. For example, imagine 3
|
||
inferiors with 2 threads each (1.1, 1.2, 2.1, 2.2, 3.1 and 3.2). Threads
|
||
2.1 and 3.2 are both waiting for a vfork-done event. Then we could ask the
|
||
target(s) to resume:
|
||
|
||
- All threads of inferior 1
|
||
- Thread 2.1
|
||
- Thread 3.2
|
||
|
||
Since we don't have that flexibility (we can only pass one ptid), just
|
||
resume the first thread waiting for a vfork-done event we find (e.g. thread
|
||
2.1). */
|
||
if (sched_multi)
|
||
{
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
if (inf->thread_waiting_for_vfork_done != nullptr)
|
||
return inf->thread_waiting_for_vfork_done->ptid;
|
||
}
|
||
else if (current_inferior ()->thread_waiting_for_vfork_done != nullptr)
|
||
return current_inferior ()->thread_waiting_for_vfork_done->ptid;
|
||
|
||
return user_visible_resume_ptid (user_step);
|
||
}
|
||
|
||
/* Wrapper for target_resume, that handles infrun-specific
|
||
bookkeeping. */
|
||
|
||
static void
|
||
do_target_resume (ptid_t resume_ptid, bool step, enum gdb_signal sig)
|
||
{
|
||
struct thread_info *tp = inferior_thread ();
|
||
|
||
gdb_assert (!tp->stop_requested);
|
||
|
||
/* Install inferior's terminal modes. */
|
||
target_terminal::inferior ();
|
||
|
||
/* Avoid confusing the next resume, if the next stop/resume
|
||
happens to apply to another thread. */
|
||
tp->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
/* Advise target which signals may be handled silently.
|
||
|
||
If we have removed breakpoints because we are stepping over one
|
||
in-line (in any thread), we need to receive all signals to avoid
|
||
accidentally skipping a breakpoint during execution of a signal
|
||
handler.
|
||
|
||
Likewise if we're displaced stepping, otherwise a trap for a
|
||
breakpoint in a signal handler might be confused with the
|
||
displaced step finishing. We don't make the displaced_step_finish
|
||
step distinguish the cases instead, because:
|
||
|
||
- a backtrace while stopped in the signal handler would show the
|
||
scratch pad as frame older than the signal handler, instead of
|
||
the real mainline code.
|
||
|
||
- when the thread is later resumed, the signal handler would
|
||
return to the scratch pad area, which would no longer be
|
||
valid. */
|
||
if (step_over_info_valid_p ()
|
||
|| displaced_step_in_progress (tp->inf))
|
||
target_pass_signals ({});
|
||
else
|
||
target_pass_signals (signal_pass);
|
||
|
||
infrun_debug_printf ("resume_ptid=%s, step=%d, sig=%s",
|
||
resume_ptid.to_string ().c_str (),
|
||
step, gdb_signal_to_symbol_string (sig));
|
||
|
||
target_resume (resume_ptid, step, sig);
|
||
}
|
||
|
||
/* Resume the inferior. SIG is the signal to give the inferior
|
||
(GDB_SIGNAL_0 for none). Note: don't call this directly; instead
|
||
call 'resume', which handles exceptions. */
|
||
|
||
static void
|
||
resume_1 (enum gdb_signal sig)
|
||
{
|
||
struct regcache *regcache = get_current_regcache ();
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
struct thread_info *tp = inferior_thread ();
|
||
const address_space *aspace = regcache->aspace ();
|
||
ptid_t resume_ptid;
|
||
/* This represents the user's step vs continue request. When
|
||
deciding whether "set scheduler-locking step" applies, it's the
|
||
user's intention that counts. */
|
||
const int user_step = tp->control.stepping_command;
|
||
/* This represents what we'll actually request the target to do.
|
||
This can decay from a step to a continue, if e.g., we need to
|
||
implement single-stepping with breakpoints (software
|
||
single-step). */
|
||
bool step;
|
||
|
||
gdb_assert (!tp->stop_requested);
|
||
gdb_assert (!thread_is_in_step_over_chain (tp));
|
||
|
||
if (tp->has_pending_waitstatus ())
|
||
{
|
||
infrun_debug_printf
|
||
("thread %s has pending wait "
|
||
"status %s (currently_stepping=%d).",
|
||
tp->ptid.to_string ().c_str (),
|
||
tp->pending_waitstatus ().to_string ().c_str (),
|
||
currently_stepping (tp));
|
||
|
||
tp->inf->process_target ()->threads_executing = true;
|
||
tp->set_resumed (true);
|
||
|
||
/* FIXME: What should we do if we are supposed to resume this
|
||
thread with a signal? Maybe we should maintain a queue of
|
||
pending signals to deliver. */
|
||
if (sig != GDB_SIGNAL_0)
|
||
{
|
||
warning (_("Couldn't deliver signal %s to %s."),
|
||
gdb_signal_to_name (sig),
|
||
tp->ptid.to_string ().c_str ());
|
||
}
|
||
|
||
tp->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
if (target_can_async_p ())
|
||
{
|
||
target_async (1);
|
||
/* Tell the event loop we have an event to process. */
|
||
mark_async_event_handler (infrun_async_inferior_event_token);
|
||
}
|
||
return;
|
||
}
|
||
|
||
tp->stepped_breakpoint = 0;
|
||
|
||
/* Depends on stepped_breakpoint. */
|
||
step = currently_stepping (tp);
|
||
|
||
if (current_inferior ()->thread_waiting_for_vfork_done != nullptr)
|
||
{
|
||
/* Don't try to single-step a vfork parent that is waiting for
|
||
the child to get out of the shared memory region (by exec'ing
|
||
or exiting). This is particularly important on software
|
||
single-step archs, as the child process would trip on the
|
||
software single step breakpoint inserted for the parent
|
||
process. Since the parent will not actually execute any
|
||
instruction until the child is out of the shared region (such
|
||
are vfork's semantics), it is safe to simply continue it.
|
||
Eventually, we'll see a TARGET_WAITKIND_VFORK_DONE event for
|
||
the parent, and tell it to `keep_going', which automatically
|
||
re-sets it stepping. */
|
||
infrun_debug_printf ("resume : clear step");
|
||
step = false;
|
||
}
|
||
|
||
CORE_ADDR pc = regcache_read_pc (regcache);
|
||
|
||
infrun_debug_printf ("step=%d, signal=%s, trap_expected=%d, "
|
||
"current thread [%s] at %s",
|
||
step, gdb_signal_to_symbol_string (sig),
|
||
tp->control.trap_expected,
|
||
inferior_ptid.to_string ().c_str (),
|
||
paddress (gdbarch, pc));
|
||
|
||
/* Normally, by the time we reach `resume', the breakpoints are either
|
||
removed or inserted, as appropriate. The exception is if we're sitting
|
||
at a permanent breakpoint; we need to step over it, but permanent
|
||
breakpoints can't be removed. So we have to test for it here. */
|
||
if (breakpoint_here_p (aspace, pc) == permanent_breakpoint_here)
|
||
{
|
||
if (sig != GDB_SIGNAL_0)
|
||
{
|
||
/* We have a signal to pass to the inferior. The resume
|
||
may, or may not take us to the signal handler. If this
|
||
is a step, we'll need to stop in the signal handler, if
|
||
there's one, (if the target supports stepping into
|
||
handlers), or in the next mainline instruction, if
|
||
there's no handler. If this is a continue, we need to be
|
||
sure to run the handler with all breakpoints inserted.
|
||
In all cases, set a breakpoint at the current address
|
||
(where the handler returns to), and once that breakpoint
|
||
is hit, resume skipping the permanent breakpoint. If
|
||
that breakpoint isn't hit, then we've stepped into the
|
||
signal handler (or hit some other event). We'll delete
|
||
the step-resume breakpoint then. */
|
||
|
||
infrun_debug_printf ("resume: skipping permanent breakpoint, "
|
||
"deliver signal first");
|
||
|
||
clear_step_over_info ();
|
||
tp->control.trap_expected = 0;
|
||
|
||
if (tp->control.step_resume_breakpoint == NULL)
|
||
{
|
||
/* Set a "high-priority" step-resume, as we don't want
|
||
user breakpoints at PC to trigger (again) when this
|
||
hits. */
|
||
insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
|
||
gdb_assert (tp->control.step_resume_breakpoint->loc->permanent);
|
||
|
||
tp->step_after_step_resume_breakpoint = step;
|
||
}
|
||
|
||
insert_breakpoints ();
|
||
}
|
||
else
|
||
{
|
||
/* There's no signal to pass, we can go ahead and skip the
|
||
permanent breakpoint manually. */
|
||
infrun_debug_printf ("skipping permanent breakpoint");
|
||
gdbarch_skip_permanent_breakpoint (gdbarch, regcache);
|
||
/* Update pc to reflect the new address from which we will
|
||
execute instructions. */
|
||
pc = regcache_read_pc (regcache);
|
||
|
||
if (step)
|
||
{
|
||
/* We've already advanced the PC, so the stepping part
|
||
is done. Now we need to arrange for a trap to be
|
||
reported to handle_inferior_event. Set a breakpoint
|
||
at the current PC, and run to it. Don't update
|
||
prev_pc, because if we end in
|
||
switch_back_to_stepped_thread, we want the "expected
|
||
thread advanced also" branch to be taken. IOW, we
|
||
don't want this thread to step further from PC
|
||
(overstep). */
|
||
gdb_assert (!step_over_info_valid_p ());
|
||
insert_single_step_breakpoint (gdbarch, aspace, pc);
|
||
insert_breakpoints ();
|
||
|
||
resume_ptid = internal_resume_ptid (user_step);
|
||
do_target_resume (resume_ptid, false, GDB_SIGNAL_0);
|
||
tp->set_resumed (true);
|
||
return;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* If we have a breakpoint to step over, make sure to do a single
|
||
step only. Same if we have software watchpoints. */
|
||
if (tp->control.trap_expected || bpstat_should_step ())
|
||
tp->control.may_range_step = 0;
|
||
|
||
/* If displaced stepping is enabled, step over breakpoints by executing a
|
||
copy of the instruction at a different address.
|
||
|
||
We can't use displaced stepping when we have a signal to deliver;
|
||
the comments for displaced_step_prepare explain why. The
|
||
comments in the handle_inferior event for dealing with 'random
|
||
signals' explain what we do instead.
|
||
|
||
We can't use displaced stepping when we are waiting for vfork_done
|
||
event, displaced stepping breaks the vfork child similarly as single
|
||
step software breakpoint. */
|
||
if (tp->control.trap_expected
|
||
&& use_displaced_stepping (tp)
|
||
&& !step_over_info_valid_p ()
|
||
&& sig == GDB_SIGNAL_0
|
||
&& current_inferior ()->thread_waiting_for_vfork_done == nullptr)
|
||
{
|
||
displaced_step_prepare_status prepare_status
|
||
= displaced_step_prepare (tp);
|
||
|
||
if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_UNAVAILABLE)
|
||
{
|
||
infrun_debug_printf ("Got placed in step-over queue");
|
||
|
||
tp->control.trap_expected = 0;
|
||
return;
|
||
}
|
||
else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_CANT)
|
||
{
|
||
/* Fallback to stepping over the breakpoint in-line. */
|
||
|
||
if (target_is_non_stop_p ())
|
||
stop_all_threads ("displaced stepping falling back on inline stepping");
|
||
|
||
set_step_over_info (regcache->aspace (),
|
||
regcache_read_pc (regcache), 0, tp->global_num);
|
||
|
||
step = maybe_software_singlestep (gdbarch);
|
||
|
||
insert_breakpoints ();
|
||
}
|
||
else if (prepare_status == DISPLACED_STEP_PREPARE_STATUS_OK)
|
||
{
|
||
/* Update pc to reflect the new address from which we will
|
||
execute instructions due to displaced stepping. */
|
||
pc = regcache_read_pc (get_thread_regcache (tp));
|
||
|
||
step = gdbarch_displaced_step_hw_singlestep (gdbarch);
|
||
}
|
||
else
|
||
gdb_assert_not_reached ("Invalid displaced_step_prepare_status "
|
||
"value.");
|
||
}
|
||
|
||
/* Do we need to do it the hard way, w/temp breakpoints? */
|
||
else if (step)
|
||
step = maybe_software_singlestep (gdbarch);
|
||
|
||
/* Currently, our software single-step implementation leads to different
|
||
results than hardware single-stepping in one situation: when stepping
|
||
into delivering a signal which has an associated signal handler,
|
||
hardware single-step will stop at the first instruction of the handler,
|
||
while software single-step will simply skip execution of the handler.
|
||
|
||
For now, this difference in behavior is accepted since there is no
|
||
easy way to actually implement single-stepping into a signal handler
|
||
without kernel support.
|
||
|
||
However, there is one scenario where this difference leads to follow-on
|
||
problems: if we're stepping off a breakpoint by removing all breakpoints
|
||
and then single-stepping. In this case, the software single-step
|
||
behavior means that even if there is a *breakpoint* in the signal
|
||
handler, GDB still would not stop.
|
||
|
||
Fortunately, we can at least fix this particular issue. We detect
|
||
here the case where we are about to deliver a signal while software
|
||
single-stepping with breakpoints removed. In this situation, we
|
||
revert the decisions to remove all breakpoints and insert single-
|
||
step breakpoints, and instead we install a step-resume breakpoint
|
||
at the current address, deliver the signal without stepping, and
|
||
once we arrive back at the step-resume breakpoint, actually step
|
||
over the breakpoint we originally wanted to step over. */
|
||
if (thread_has_single_step_breakpoints_set (tp)
|
||
&& sig != GDB_SIGNAL_0
|
||
&& step_over_info_valid_p ())
|
||
{
|
||
/* If we have nested signals or a pending signal is delivered
|
||
immediately after a handler returns, might already have
|
||
a step-resume breakpoint set on the earlier handler. We cannot
|
||
set another step-resume breakpoint; just continue on until the
|
||
original breakpoint is hit. */
|
||
if (tp->control.step_resume_breakpoint == NULL)
|
||
{
|
||
insert_hp_step_resume_breakpoint_at_frame (get_current_frame ());
|
||
tp->step_after_step_resume_breakpoint = 1;
|
||
}
|
||
|
||
delete_single_step_breakpoints (tp);
|
||
|
||
clear_step_over_info ();
|
||
tp->control.trap_expected = 0;
|
||
|
||
insert_breakpoints ();
|
||
}
|
||
|
||
/* If STEP is set, it's a request to use hardware stepping
|
||
facilities. But in that case, we should never
|
||
use singlestep breakpoint. */
|
||
gdb_assert (!(thread_has_single_step_breakpoints_set (tp) && step));
|
||
|
||
/* Decide the set of threads to ask the target to resume. */
|
||
if (tp->control.trap_expected)
|
||
{
|
||
/* We're allowing a thread to run past a breakpoint it has
|
||
hit, either by single-stepping the thread with the breakpoint
|
||
removed, or by displaced stepping, with the breakpoint inserted.
|
||
In the former case, we need to single-step only this thread,
|
||
and keep others stopped, as they can miss this breakpoint if
|
||
allowed to run. That's not really a problem for displaced
|
||
stepping, but, we still keep other threads stopped, in case
|
||
another thread is also stopped for a breakpoint waiting for
|
||
its turn in the displaced stepping queue. */
|
||
resume_ptid = inferior_ptid;
|
||
}
|
||
else
|
||
resume_ptid = internal_resume_ptid (user_step);
|
||
|
||
if (execution_direction != EXEC_REVERSE
|
||
&& step && breakpoint_inserted_here_p (aspace, pc))
|
||
{
|
||
/* There are two cases where we currently need to step a
|
||
breakpoint instruction when we have a signal to deliver:
|
||
|
||
- See handle_signal_stop where we handle random signals that
|
||
could take out us out of the stepping range. Normally, in
|
||
that case we end up continuing (instead of stepping) over the
|
||
signal handler with a breakpoint at PC, but there are cases
|
||
where we should _always_ single-step, even if we have a
|
||
step-resume breakpoint, like when a software watchpoint is
|
||
set. Assuming single-stepping and delivering a signal at the
|
||
same time would takes us to the signal handler, then we could
|
||
have removed the breakpoint at PC to step over it. However,
|
||
some hardware step targets (like e.g., Mac OS) can't step
|
||
into signal handlers, and for those, we need to leave the
|
||
breakpoint at PC inserted, as otherwise if the handler
|
||
recurses and executes PC again, it'll miss the breakpoint.
|
||
So we leave the breakpoint inserted anyway, but we need to
|
||
record that we tried to step a breakpoint instruction, so
|
||
that adjust_pc_after_break doesn't end up confused.
|
||
|
||
- In non-stop if we insert a breakpoint (e.g., a step-resume)
|
||
in one thread after another thread that was stepping had been
|
||
momentarily paused for a step-over. When we re-resume the
|
||
stepping thread, it may be resumed from that address with a
|
||
breakpoint that hasn't trapped yet. Seen with
|
||
gdb.threads/non-stop-fair-events.exp, on targets that don't
|
||
do displaced stepping. */
|
||
|
||
infrun_debug_printf ("resume: [%s] stepped breakpoint",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
tp->stepped_breakpoint = 1;
|
||
|
||
/* Most targets can step a breakpoint instruction, thus
|
||
executing it normally. But if this one cannot, just
|
||
continue and we will hit it anyway. */
|
||
if (gdbarch_cannot_step_breakpoint (gdbarch))
|
||
step = false;
|
||
}
|
||
|
||
if (debug_displaced
|
||
&& tp->control.trap_expected
|
||
&& use_displaced_stepping (tp)
|
||
&& !step_over_info_valid_p ())
|
||
{
|
||
struct regcache *resume_regcache = get_thread_regcache (tp);
|
||
struct gdbarch *resume_gdbarch = resume_regcache->arch ();
|
||
CORE_ADDR actual_pc = regcache_read_pc (resume_regcache);
|
||
gdb_byte buf[4];
|
||
|
||
read_memory (actual_pc, buf, sizeof (buf));
|
||
displaced_debug_printf ("run %s: %s",
|
||
paddress (resume_gdbarch, actual_pc),
|
||
displaced_step_dump_bytes
|
||
(buf, sizeof (buf)).c_str ());
|
||
}
|
||
|
||
if (tp->control.may_range_step)
|
||
{
|
||
/* If we're resuming a thread with the PC out of the step
|
||
range, then we're doing some nested/finer run control
|
||
operation, like stepping the thread out of the dynamic
|
||
linker or the displaced stepping scratch pad. We
|
||
shouldn't have allowed a range step then. */
|
||
gdb_assert (pc_in_thread_step_range (pc, tp));
|
||
}
|
||
|
||
do_target_resume (resume_ptid, step, sig);
|
||
tp->set_resumed (true);
|
||
}
|
||
|
||
/* Resume the inferior. SIG is the signal to give the inferior
|
||
(GDB_SIGNAL_0 for none). This is a wrapper around 'resume_1' that
|
||
rolls back state on error. */
|
||
|
||
static void
|
||
resume (gdb_signal sig)
|
||
{
|
||
try
|
||
{
|
||
resume_1 (sig);
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
/* If resuming is being aborted for any reason, delete any
|
||
single-step breakpoint resume_1 may have created, to avoid
|
||
confusing the following resumption, and to avoid leaving
|
||
single-step breakpoints perturbing other threads, in case
|
||
we're running in non-stop mode. */
|
||
if (inferior_ptid != null_ptid)
|
||
delete_single_step_breakpoints (inferior_thread ());
|
||
throw;
|
||
}
|
||
}
|
||
|
||
|
||
/* Proceeding. */
|
||
|
||
/* See infrun.h. */
|
||
|
||
/* Counter that tracks number of user visible stops. This can be used
|
||
to tell whether a command has proceeded the inferior past the
|
||
current location. This allows e.g., inferior function calls in
|
||
breakpoint commands to not interrupt the command list. When the
|
||
call finishes successfully, the inferior is standing at the same
|
||
breakpoint as if nothing happened (and so we don't call
|
||
normal_stop). */
|
||
static ULONGEST current_stop_id;
|
||
|
||
/* See infrun.h. */
|
||
|
||
ULONGEST
|
||
get_stop_id (void)
|
||
{
|
||
return current_stop_id;
|
||
}
|
||
|
||
/* Called when we report a user visible stop. */
|
||
|
||
static void
|
||
new_stop_id (void)
|
||
{
|
||
current_stop_id++;
|
||
}
|
||
|
||
/* Clear out all variables saying what to do when inferior is continued.
|
||
First do this, then set the ones you want, then call `proceed'. */
|
||
|
||
static void
|
||
clear_proceed_status_thread (struct thread_info *tp)
|
||
{
|
||
infrun_debug_printf ("%s", tp->ptid.to_string ().c_str ());
|
||
|
||
/* If we're starting a new sequence, then the previous finished
|
||
single-step is no longer relevant. */
|
||
if (tp->has_pending_waitstatus ())
|
||
{
|
||
if (tp->stop_reason () == TARGET_STOPPED_BY_SINGLE_STEP)
|
||
{
|
||
infrun_debug_printf ("pending event of %s was a finished step. "
|
||
"Discarding.",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
tp->clear_pending_waitstatus ();
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON);
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf
|
||
("thread %s has pending wait status %s (currently_stepping=%d).",
|
||
tp->ptid.to_string ().c_str (),
|
||
tp->pending_waitstatus ().to_string ().c_str (),
|
||
currently_stepping (tp));
|
||
}
|
||
}
|
||
|
||
/* If this signal should not be seen by program, give it zero.
|
||
Used for debugging signals. */
|
||
if (!signal_pass_state (tp->stop_signal ()))
|
||
tp->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
tp->release_thread_fsm ();
|
||
|
||
tp->control.trap_expected = 0;
|
||
tp->control.step_range_start = 0;
|
||
tp->control.step_range_end = 0;
|
||
tp->control.may_range_step = 0;
|
||
tp->control.step_frame_id = null_frame_id;
|
||
tp->control.step_stack_frame_id = null_frame_id;
|
||
tp->control.step_over_calls = STEP_OVER_UNDEBUGGABLE;
|
||
tp->control.step_start_function = NULL;
|
||
tp->stop_requested = 0;
|
||
|
||
tp->control.stop_step = 0;
|
||
|
||
tp->control.proceed_to_finish = 0;
|
||
|
||
tp->control.stepping_command = 0;
|
||
|
||
/* Discard any remaining commands or status from previous stop. */
|
||
bpstat_clear (&tp->control.stop_bpstat);
|
||
}
|
||
|
||
void
|
||
clear_proceed_status (int step)
|
||
{
|
||
/* With scheduler-locking replay, stop replaying other threads if we're
|
||
not replaying the user-visible resume ptid.
|
||
|
||
This is a convenience feature to not require the user to explicitly
|
||
stop replaying the other threads. We're assuming that the user's
|
||
intent is to resume tracing the recorded process. */
|
||
if (!non_stop && scheduler_mode == schedlock_replay
|
||
&& target_record_is_replaying (minus_one_ptid)
|
||
&& !target_record_will_replay (user_visible_resume_ptid (step),
|
||
execution_direction))
|
||
target_record_stop_replaying ();
|
||
|
||
if (!non_stop && inferior_ptid != null_ptid)
|
||
{
|
||
ptid_t resume_ptid = user_visible_resume_ptid (step);
|
||
process_stratum_target *resume_target
|
||
= user_visible_resume_target (resume_ptid);
|
||
|
||
/* In all-stop mode, delete the per-thread status of all threads
|
||
we're about to resume, implicitly and explicitly. */
|
||
for (thread_info *tp : all_non_exited_threads (resume_target, resume_ptid))
|
||
clear_proceed_status_thread (tp);
|
||
}
|
||
|
||
if (inferior_ptid != null_ptid)
|
||
{
|
||
struct inferior *inferior;
|
||
|
||
if (non_stop)
|
||
{
|
||
/* If in non-stop mode, only delete the per-thread status of
|
||
the current thread. */
|
||
clear_proceed_status_thread (inferior_thread ());
|
||
}
|
||
|
||
inferior = current_inferior ();
|
||
inferior->control.stop_soon = NO_STOP_QUIETLY;
|
||
}
|
||
|
||
gdb::observers::about_to_proceed.notify ();
|
||
}
|
||
|
||
/* Returns true if TP is still stopped at a breakpoint that needs
|
||
stepping-over in order to make progress. If the breakpoint is gone
|
||
meanwhile, we can skip the whole step-over dance. */
|
||
|
||
static bool
|
||
thread_still_needs_step_over_bp (struct thread_info *tp)
|
||
{
|
||
if (tp->stepping_over_breakpoint)
|
||
{
|
||
struct regcache *regcache = get_thread_regcache (tp);
|
||
|
||
if (breakpoint_here_p (regcache->aspace (),
|
||
regcache_read_pc (regcache))
|
||
== ordinary_breakpoint_here)
|
||
return true;
|
||
|
||
tp->stepping_over_breakpoint = 0;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Check whether thread TP still needs to start a step-over in order
|
||
to make progress when resumed. Returns an bitwise or of enum
|
||
step_over_what bits, indicating what needs to be stepped over. */
|
||
|
||
static step_over_what
|
||
thread_still_needs_step_over (struct thread_info *tp)
|
||
{
|
||
step_over_what what = 0;
|
||
|
||
if (thread_still_needs_step_over_bp (tp))
|
||
what |= STEP_OVER_BREAKPOINT;
|
||
|
||
if (tp->stepping_over_watchpoint
|
||
&& !target_have_steppable_watchpoint ())
|
||
what |= STEP_OVER_WATCHPOINT;
|
||
|
||
return what;
|
||
}
|
||
|
||
/* Returns true if scheduler locking applies. STEP indicates whether
|
||
we're about to do a step/next-like command to a thread. */
|
||
|
||
static bool
|
||
schedlock_applies (struct thread_info *tp)
|
||
{
|
||
return (scheduler_mode == schedlock_on
|
||
|| (scheduler_mode == schedlock_step
|
||
&& tp->control.stepping_command)
|
||
|| (scheduler_mode == schedlock_replay
|
||
&& target_record_will_replay (minus_one_ptid,
|
||
execution_direction)));
|
||
}
|
||
|
||
/* Set process_stratum_target::COMMIT_RESUMED_STATE in all target
|
||
stacks that have threads executing and don't have threads with
|
||
pending events. */
|
||
|
||
static void
|
||
maybe_set_commit_resumed_all_targets ()
|
||
{
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
process_stratum_target *proc_target = inf->process_target ();
|
||
|
||
if (proc_target->commit_resumed_state)
|
||
{
|
||
/* We already set this in a previous iteration, via another
|
||
inferior sharing the process_stratum target. */
|
||
continue;
|
||
}
|
||
|
||
/* If the target has no resumed threads, it would be useless to
|
||
ask it to commit the resumed threads. */
|
||
if (!proc_target->threads_executing)
|
||
{
|
||
infrun_debug_printf ("not requesting commit-resumed for target "
|
||
"%s, no resumed threads",
|
||
proc_target->shortname ());
|
||
continue;
|
||
}
|
||
|
||
/* As an optimization, if a thread from this target has some
|
||
status to report, handle it before requiring the target to
|
||
commit its resumed threads: handling the status might lead to
|
||
resuming more threads. */
|
||
if (proc_target->has_resumed_with_pending_wait_status ())
|
||
{
|
||
infrun_debug_printf ("not requesting commit-resumed for target %s, a"
|
||
" thread has a pending waitstatus",
|
||
proc_target->shortname ());
|
||
continue;
|
||
}
|
||
|
||
switch_to_inferior_no_thread (inf);
|
||
|
||
if (target_has_pending_events ())
|
||
{
|
||
infrun_debug_printf ("not requesting commit-resumed for target %s, "
|
||
"target has pending events",
|
||
proc_target->shortname ());
|
||
continue;
|
||
}
|
||
|
||
infrun_debug_printf ("enabling commit-resumed for target %s",
|
||
proc_target->shortname ());
|
||
|
||
proc_target->commit_resumed_state = true;
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
maybe_call_commit_resumed_all_targets ()
|
||
{
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
process_stratum_target *proc_target = inf->process_target ();
|
||
|
||
if (!proc_target->commit_resumed_state)
|
||
continue;
|
||
|
||
switch_to_inferior_no_thread (inf);
|
||
|
||
infrun_debug_printf ("calling commit_resumed for target %s",
|
||
proc_target->shortname());
|
||
|
||
target_commit_resumed ();
|
||
}
|
||
}
|
||
|
||
/* To track nesting of scoped_disable_commit_resumed objects, ensuring
|
||
that only the outermost one attempts to re-enable
|
||
commit-resumed. */
|
||
static bool enable_commit_resumed = true;
|
||
|
||
/* See infrun.h. */
|
||
|
||
scoped_disable_commit_resumed::scoped_disable_commit_resumed
|
||
(const char *reason)
|
||
: m_reason (reason),
|
||
m_prev_enable_commit_resumed (enable_commit_resumed)
|
||
{
|
||
infrun_debug_printf ("reason=%s", m_reason);
|
||
|
||
enable_commit_resumed = false;
|
||
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
process_stratum_target *proc_target = inf->process_target ();
|
||
|
||
if (m_prev_enable_commit_resumed)
|
||
{
|
||
/* This is the outermost instance: force all
|
||
COMMIT_RESUMED_STATE to false. */
|
||
proc_target->commit_resumed_state = false;
|
||
}
|
||
else
|
||
{
|
||
/* This is not the outermost instance, we expect
|
||
COMMIT_RESUMED_STATE to have been cleared by the
|
||
outermost instance. */
|
||
gdb_assert (!proc_target->commit_resumed_state);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
scoped_disable_commit_resumed::reset ()
|
||
{
|
||
if (m_reset)
|
||
return;
|
||
m_reset = true;
|
||
|
||
infrun_debug_printf ("reason=%s", m_reason);
|
||
|
||
gdb_assert (!enable_commit_resumed);
|
||
|
||
enable_commit_resumed = m_prev_enable_commit_resumed;
|
||
|
||
if (m_prev_enable_commit_resumed)
|
||
{
|
||
/* This is the outermost instance, re-enable
|
||
COMMIT_RESUMED_STATE on the targets where it's possible. */
|
||
maybe_set_commit_resumed_all_targets ();
|
||
}
|
||
else
|
||
{
|
||
/* This is not the outermost instance, we expect
|
||
COMMIT_RESUMED_STATE to still be false. */
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
process_stratum_target *proc_target = inf->process_target ();
|
||
gdb_assert (!proc_target->commit_resumed_state);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
scoped_disable_commit_resumed::~scoped_disable_commit_resumed ()
|
||
{
|
||
reset ();
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
scoped_disable_commit_resumed::reset_and_commit ()
|
||
{
|
||
reset ();
|
||
maybe_call_commit_resumed_all_targets ();
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
scoped_enable_commit_resumed::scoped_enable_commit_resumed
|
||
(const char *reason)
|
||
: m_reason (reason),
|
||
m_prev_enable_commit_resumed (enable_commit_resumed)
|
||
{
|
||
infrun_debug_printf ("reason=%s", m_reason);
|
||
|
||
if (!enable_commit_resumed)
|
||
{
|
||
enable_commit_resumed = true;
|
||
|
||
/* Re-enable COMMIT_RESUMED_STATE on the targets where it's
|
||
possible. */
|
||
maybe_set_commit_resumed_all_targets ();
|
||
|
||
maybe_call_commit_resumed_all_targets ();
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
scoped_enable_commit_resumed::~scoped_enable_commit_resumed ()
|
||
{
|
||
infrun_debug_printf ("reason=%s", m_reason);
|
||
|
||
gdb_assert (enable_commit_resumed);
|
||
|
||
enable_commit_resumed = m_prev_enable_commit_resumed;
|
||
|
||
if (!enable_commit_resumed)
|
||
{
|
||
/* Force all COMMIT_RESUMED_STATE back to false. */
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
process_stratum_target *proc_target = inf->process_target ();
|
||
proc_target->commit_resumed_state = false;
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Check that all the targets we're about to resume are in non-stop
|
||
mode. Ideally, we'd only care whether all targets support
|
||
target-async, but we're not there yet. E.g., stop_all_threads
|
||
doesn't know how to handle all-stop targets. Also, the remote
|
||
protocol in all-stop mode is synchronous, irrespective of
|
||
target-async, which means that things like a breakpoint re-set
|
||
triggered by one target would try to read memory from all targets
|
||
and fail. */
|
||
|
||
static void
|
||
check_multi_target_resumption (process_stratum_target *resume_target)
|
||
{
|
||
if (!non_stop && resume_target == nullptr)
|
||
{
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
/* This is used to track whether we're resuming more than one
|
||
target. */
|
||
process_stratum_target *first_connection = nullptr;
|
||
|
||
/* The first inferior we see with a target that does not work in
|
||
always-non-stop mode. */
|
||
inferior *first_not_non_stop = nullptr;
|
||
|
||
for (inferior *inf : all_non_exited_inferiors ())
|
||
{
|
||
switch_to_inferior_no_thread (inf);
|
||
|
||
if (!target_has_execution ())
|
||
continue;
|
||
|
||
process_stratum_target *proc_target
|
||
= current_inferior ()->process_target();
|
||
|
||
if (!target_is_non_stop_p ())
|
||
first_not_non_stop = inf;
|
||
|
||
if (first_connection == nullptr)
|
||
first_connection = proc_target;
|
||
else if (first_connection != proc_target
|
||
&& first_not_non_stop != nullptr)
|
||
{
|
||
switch_to_inferior_no_thread (first_not_non_stop);
|
||
|
||
proc_target = current_inferior ()->process_target();
|
||
|
||
error (_("Connection %d (%s) does not support "
|
||
"multi-target resumption."),
|
||
proc_target->connection_number,
|
||
make_target_connection_string (proc_target).c_str ());
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Basic routine for continuing the program in various fashions.
|
||
|
||
ADDR is the address to resume at, or -1 for resume where stopped.
|
||
SIGGNAL is the signal to give it, or GDB_SIGNAL_0 for none,
|
||
or GDB_SIGNAL_DEFAULT for act according to how it stopped.
|
||
|
||
You should call clear_proceed_status before calling proceed. */
|
||
|
||
void
|
||
proceed (CORE_ADDR addr, enum gdb_signal siggnal)
|
||
{
|
||
INFRUN_SCOPED_DEBUG_ENTER_EXIT;
|
||
|
||
struct regcache *regcache;
|
||
struct gdbarch *gdbarch;
|
||
CORE_ADDR pc;
|
||
struct execution_control_state ecss;
|
||
struct execution_control_state *ecs = &ecss;
|
||
|
||
/* If we're stopped at a fork/vfork, follow the branch set by the
|
||
"set follow-fork-mode" command; otherwise, we'll just proceed
|
||
resuming the current thread. */
|
||
if (!follow_fork ())
|
||
{
|
||
/* The target for some reason decided not to resume. */
|
||
normal_stop ();
|
||
if (target_can_async_p ())
|
||
inferior_event_handler (INF_EXEC_COMPLETE);
|
||
return;
|
||
}
|
||
|
||
/* We'll update this if & when we switch to a new thread. */
|
||
previous_inferior_ptid = inferior_ptid;
|
||
|
||
regcache = get_current_regcache ();
|
||
gdbarch = regcache->arch ();
|
||
const address_space *aspace = regcache->aspace ();
|
||
|
||
pc = regcache_read_pc_protected (regcache);
|
||
|
||
thread_info *cur_thr = inferior_thread ();
|
||
|
||
/* Fill in with reasonable starting values. */
|
||
init_thread_stepping_state (cur_thr);
|
||
|
||
gdb_assert (!thread_is_in_step_over_chain (cur_thr));
|
||
|
||
ptid_t resume_ptid
|
||
= user_visible_resume_ptid (cur_thr->control.stepping_command);
|
||
process_stratum_target *resume_target
|
||
= user_visible_resume_target (resume_ptid);
|
||
|
||
check_multi_target_resumption (resume_target);
|
||
|
||
if (addr == (CORE_ADDR) -1)
|
||
{
|
||
if (cur_thr->stop_pc_p ()
|
||
&& pc == cur_thr->stop_pc ()
|
||
&& breakpoint_here_p (aspace, pc) == ordinary_breakpoint_here
|
||
&& execution_direction != EXEC_REVERSE)
|
||
/* There is a breakpoint at the address we will resume at,
|
||
step one instruction before inserting breakpoints so that
|
||
we do not stop right away (and report a second hit at this
|
||
breakpoint).
|
||
|
||
Note, we don't do this in reverse, because we won't
|
||
actually be executing the breakpoint insn anyway.
|
||
We'll be (un-)executing the previous instruction. */
|
||
cur_thr->stepping_over_breakpoint = 1;
|
||
else if (gdbarch_single_step_through_delay_p (gdbarch)
|
||
&& gdbarch_single_step_through_delay (gdbarch,
|
||
get_current_frame ()))
|
||
/* We stepped onto an instruction that needs to be stepped
|
||
again before re-inserting the breakpoint, do so. */
|
||
cur_thr->stepping_over_breakpoint = 1;
|
||
}
|
||
else
|
||
{
|
||
regcache_write_pc (regcache, addr);
|
||
}
|
||
|
||
if (siggnal != GDB_SIGNAL_DEFAULT)
|
||
cur_thr->set_stop_signal (siggnal);
|
||
|
||
/* If an exception is thrown from this point on, make sure to
|
||
propagate GDB's knowledge of the executing state to the
|
||
frontend/user running state. */
|
||
scoped_finish_thread_state finish_state (resume_target, resume_ptid);
|
||
|
||
/* Even if RESUME_PTID is a wildcard, and we end up resuming fewer
|
||
threads (e.g., we might need to set threads stepping over
|
||
breakpoints first), from the user/frontend's point of view, all
|
||
threads in RESUME_PTID are now running. Unless we're calling an
|
||
inferior function, as in that case we pretend the inferior
|
||
doesn't run at all. */
|
||
if (!cur_thr->control.in_infcall)
|
||
set_running (resume_target, resume_ptid, true);
|
||
|
||
infrun_debug_printf ("addr=%s, signal=%s", paddress (gdbarch, addr),
|
||
gdb_signal_to_symbol_string (siggnal));
|
||
|
||
annotate_starting ();
|
||
|
||
/* Make sure that output from GDB appears before output from the
|
||
inferior. */
|
||
gdb_flush (gdb_stdout);
|
||
|
||
/* Since we've marked the inferior running, give it the terminal. A
|
||
QUIT/Ctrl-C from here on is forwarded to the target (which can
|
||
still detect attempts to unblock a stuck connection with repeated
|
||
Ctrl-C from within target_pass_ctrlc). */
|
||
target_terminal::inferior ();
|
||
|
||
/* In a multi-threaded task we may select another thread and
|
||
then continue or step.
|
||
|
||
But if a thread that we're resuming had stopped at a breakpoint,
|
||
it will immediately cause another breakpoint stop without any
|
||
execution (i.e. it will report a breakpoint hit incorrectly). So
|
||
we must step over it first.
|
||
|
||
Look for threads other than the current (TP) that reported a
|
||
breakpoint hit and haven't been resumed yet since. */
|
||
|
||
/* If scheduler locking applies, we can avoid iterating over all
|
||
threads. */
|
||
if (!non_stop && !schedlock_applies (cur_thr))
|
||
{
|
||
for (thread_info *tp : all_non_exited_threads (resume_target,
|
||
resume_ptid))
|
||
{
|
||
switch_to_thread_no_regs (tp);
|
||
|
||
/* Ignore the current thread here. It's handled
|
||
afterwards. */
|
||
if (tp == cur_thr)
|
||
continue;
|
||
|
||
if (!thread_still_needs_step_over (tp))
|
||
continue;
|
||
|
||
gdb_assert (!thread_is_in_step_over_chain (tp));
|
||
|
||
infrun_debug_printf ("need to step-over [%s] first",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
global_thread_step_over_chain_enqueue (tp);
|
||
}
|
||
|
||
switch_to_thread (cur_thr);
|
||
}
|
||
|
||
/* Enqueue the current thread last, so that we move all other
|
||
threads over their breakpoints first. */
|
||
if (cur_thr->stepping_over_breakpoint)
|
||
global_thread_step_over_chain_enqueue (cur_thr);
|
||
|
||
/* If the thread isn't started, we'll still need to set its prev_pc,
|
||
so that switch_back_to_stepped_thread knows the thread hasn't
|
||
advanced. Must do this before resuming any thread, as in
|
||
all-stop/remote, once we resume we can't send any other packet
|
||
until the target stops again. */
|
||
cur_thr->prev_pc = regcache_read_pc_protected (regcache);
|
||
|
||
{
|
||
scoped_disable_commit_resumed disable_commit_resumed ("proceeding");
|
||
bool step_over_started = start_step_over ();
|
||
|
||
if (step_over_info_valid_p ())
|
||
{
|
||
/* Either this thread started a new in-line step over, or some
|
||
other thread was already doing one. In either case, don't
|
||
resume anything else until the step-over is finished. */
|
||
}
|
||
else if (step_over_started && !target_is_non_stop_p ())
|
||
{
|
||
/* A new displaced stepping sequence was started. In all-stop,
|
||
we can't talk to the target anymore until it next stops. */
|
||
}
|
||
else if (!non_stop && target_is_non_stop_p ())
|
||
{
|
||
INFRUN_SCOPED_DEBUG_START_END
|
||
("resuming threads, all-stop-on-top-of-non-stop");
|
||
|
||
/* In all-stop, but the target is always in non-stop mode.
|
||
Start all other threads that are implicitly resumed too. */
|
||
for (thread_info *tp : all_non_exited_threads (resume_target,
|
||
resume_ptid))
|
||
{
|
||
switch_to_thread_no_regs (tp);
|
||
|
||
if (!tp->inf->has_execution ())
|
||
{
|
||
infrun_debug_printf ("[%s] target has no execution",
|
||
tp->ptid.to_string ().c_str ());
|
||
continue;
|
||
}
|
||
|
||
if (tp->resumed ())
|
||
{
|
||
infrun_debug_printf ("[%s] resumed",
|
||
tp->ptid.to_string ().c_str ());
|
||
gdb_assert (tp->executing () || tp->has_pending_waitstatus ());
|
||
continue;
|
||
}
|
||
|
||
if (thread_is_in_step_over_chain (tp))
|
||
{
|
||
infrun_debug_printf ("[%s] needs step-over",
|
||
tp->ptid.to_string ().c_str ());
|
||
continue;
|
||
}
|
||
|
||
/* If a thread of that inferior is waiting for a vfork-done
|
||
(for a detached vfork child to exec or exit), breakpoints are
|
||
removed. We must not resume any thread of that inferior, other
|
||
than the one waiting for the vfork-done. */
|
||
if (tp->inf->thread_waiting_for_vfork_done != nullptr
|
||
&& tp != tp->inf->thread_waiting_for_vfork_done)
|
||
{
|
||
infrun_debug_printf ("[%s] another thread of this inferior is "
|
||
"waiting for vfork-done",
|
||
tp->ptid.to_string ().c_str ());
|
||
continue;
|
||
}
|
||
|
||
infrun_debug_printf ("resuming %s",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
reset_ecs (ecs, tp);
|
||
switch_to_thread (tp);
|
||
keep_going_pass_signal (ecs);
|
||
if (!ecs->wait_some_more)
|
||
error (_("Command aborted."));
|
||
}
|
||
}
|
||
else if (!cur_thr->resumed ()
|
||
&& !thread_is_in_step_over_chain (cur_thr)
|
||
/* In non-stop, forbid resuming a thread if some other thread of
|
||
that inferior is waiting for a vfork-done event (this means
|
||
breakpoints are out for this inferior). */
|
||
&& !(non_stop
|
||
&& cur_thr->inf->thread_waiting_for_vfork_done != nullptr))
|
||
{
|
||
/* The thread wasn't started, and isn't queued, run it now. */
|
||
reset_ecs (ecs, cur_thr);
|
||
switch_to_thread (cur_thr);
|
||
keep_going_pass_signal (ecs);
|
||
if (!ecs->wait_some_more)
|
||
error (_("Command aborted."));
|
||
}
|
||
|
||
disable_commit_resumed.reset_and_commit ();
|
||
}
|
||
|
||
finish_state.release ();
|
||
|
||
/* If we've switched threads above, switch back to the previously
|
||
current thread. We don't want the user to see a different
|
||
selected thread. */
|
||
switch_to_thread (cur_thr);
|
||
|
||
/* Tell the event loop to wait for it to stop. If the target
|
||
supports asynchronous execution, it'll do this from within
|
||
target_resume. */
|
||
if (!target_can_async_p ())
|
||
mark_async_event_handler (infrun_async_inferior_event_token);
|
||
}
|
||
|
||
|
||
/* Start remote-debugging of a machine over a serial link. */
|
||
|
||
void
|
||
start_remote (int from_tty)
|
||
{
|
||
inferior *inf = current_inferior ();
|
||
inf->control.stop_soon = STOP_QUIETLY_REMOTE;
|
||
|
||
/* Always go on waiting for the target, regardless of the mode. */
|
||
/* FIXME: cagney/1999-09-23: At present it isn't possible to
|
||
indicate to wait_for_inferior that a target should timeout if
|
||
nothing is returned (instead of just blocking). Because of this,
|
||
targets expecting an immediate response need to, internally, set
|
||
things up so that the target_wait() is forced to eventually
|
||
timeout. */
|
||
/* FIXME: cagney/1999-09-24: It isn't possible for target_open() to
|
||
differentiate to its caller what the state of the target is after
|
||
the initial open has been performed. Here we're assuming that
|
||
the target has stopped. It should be possible to eventually have
|
||
target_open() return to the caller an indication that the target
|
||
is currently running and GDB state should be set to the same as
|
||
for an async run. */
|
||
wait_for_inferior (inf);
|
||
|
||
/* Now that the inferior has stopped, do any bookkeeping like
|
||
loading shared libraries. We want to do this before normal_stop,
|
||
so that the displayed frame is up to date. */
|
||
post_create_inferior (from_tty);
|
||
|
||
normal_stop ();
|
||
}
|
||
|
||
/* Initialize static vars when a new inferior begins. */
|
||
|
||
void
|
||
init_wait_for_inferior (void)
|
||
{
|
||
/* These are meaningless until the first time through wait_for_inferior. */
|
||
|
||
breakpoint_init_inferior (inf_starting);
|
||
|
||
clear_proceed_status (0);
|
||
|
||
nullify_last_target_wait_ptid ();
|
||
|
||
previous_inferior_ptid = inferior_ptid;
|
||
}
|
||
|
||
|
||
|
||
static void handle_inferior_event (struct execution_control_state *ecs);
|
||
|
||
static void handle_step_into_function (struct gdbarch *gdbarch,
|
||
struct execution_control_state *ecs);
|
||
static void handle_step_into_function_backward (struct gdbarch *gdbarch,
|
||
struct execution_control_state *ecs);
|
||
static void handle_signal_stop (struct execution_control_state *ecs);
|
||
static void check_exception_resume (struct execution_control_state *,
|
||
struct frame_info *);
|
||
|
||
static void end_stepping_range (struct execution_control_state *ecs);
|
||
static void stop_waiting (struct execution_control_state *ecs);
|
||
static void keep_going (struct execution_control_state *ecs);
|
||
static void process_event_stop_test (struct execution_control_state *ecs);
|
||
static bool switch_back_to_stepped_thread (struct execution_control_state *ecs);
|
||
|
||
/* This function is attached as a "thread_stop_requested" observer.
|
||
Cleanup local state that assumed the PTID was to be resumed, and
|
||
report the stop to the frontend. */
|
||
|
||
static void
|
||
infrun_thread_stop_requested (ptid_t ptid)
|
||
{
|
||
process_stratum_target *curr_target = current_inferior ()->process_target ();
|
||
|
||
/* PTID was requested to stop. If the thread was already stopped,
|
||
but the user/frontend doesn't know about that yet (e.g., the
|
||
thread had been temporarily paused for some step-over), set up
|
||
for reporting the stop now. */
|
||
for (thread_info *tp : all_threads (curr_target, ptid))
|
||
{
|
||
if (tp->state != THREAD_RUNNING)
|
||
continue;
|
||
if (tp->executing ())
|
||
continue;
|
||
|
||
/* Remove matching threads from the step-over queue, so
|
||
start_step_over doesn't try to resume them
|
||
automatically. */
|
||
if (thread_is_in_step_over_chain (tp))
|
||
global_thread_step_over_chain_remove (tp);
|
||
|
||
/* If the thread is stopped, but the user/frontend doesn't
|
||
know about that yet, queue a pending event, as if the
|
||
thread had just stopped now. Unless the thread already had
|
||
a pending event. */
|
||
if (!tp->has_pending_waitstatus ())
|
||
{
|
||
target_waitstatus ws;
|
||
ws.set_stopped (GDB_SIGNAL_0);
|
||
tp->set_pending_waitstatus (ws);
|
||
}
|
||
|
||
/* Clear the inline-frame state, since we're re-processing the
|
||
stop. */
|
||
clear_inline_frame_state (tp);
|
||
|
||
/* If this thread was paused because some other thread was
|
||
doing an inline-step over, let that finish first. Once
|
||
that happens, we'll restart all threads and consume pending
|
||
stop events then. */
|
||
if (step_over_info_valid_p ())
|
||
continue;
|
||
|
||
/* Otherwise we can process the (new) pending event now. Set
|
||
it so this pending event is considered by
|
||
do_target_wait. */
|
||
tp->set_resumed (true);
|
||
}
|
||
}
|
||
|
||
static void
|
||
infrun_thread_thread_exit (struct thread_info *tp, int silent)
|
||
{
|
||
if (target_last_proc_target == tp->inf->process_target ()
|
||
&& target_last_wait_ptid == tp->ptid)
|
||
nullify_last_target_wait_ptid ();
|
||
}
|
||
|
||
/* Delete the step resume, single-step and longjmp/exception resume
|
||
breakpoints of TP. */
|
||
|
||
static void
|
||
delete_thread_infrun_breakpoints (struct thread_info *tp)
|
||
{
|
||
delete_step_resume_breakpoint (tp);
|
||
delete_exception_resume_breakpoint (tp);
|
||
delete_single_step_breakpoints (tp);
|
||
}
|
||
|
||
/* If the target still has execution, call FUNC for each thread that
|
||
just stopped. In all-stop, that's all the non-exited threads; in
|
||
non-stop, that's the current thread, only. */
|
||
|
||
typedef void (*for_each_just_stopped_thread_callback_func)
|
||
(struct thread_info *tp);
|
||
|
||
static void
|
||
for_each_just_stopped_thread (for_each_just_stopped_thread_callback_func func)
|
||
{
|
||
if (!target_has_execution () || inferior_ptid == null_ptid)
|
||
return;
|
||
|
||
if (target_is_non_stop_p ())
|
||
{
|
||
/* If in non-stop mode, only the current thread stopped. */
|
||
func (inferior_thread ());
|
||
}
|
||
else
|
||
{
|
||
/* In all-stop mode, all threads have stopped. */
|
||
for (thread_info *tp : all_non_exited_threads ())
|
||
func (tp);
|
||
}
|
||
}
|
||
|
||
/* Delete the step resume and longjmp/exception resume breakpoints of
|
||
the threads that just stopped. */
|
||
|
||
static void
|
||
delete_just_stopped_threads_infrun_breakpoints (void)
|
||
{
|
||
for_each_just_stopped_thread (delete_thread_infrun_breakpoints);
|
||
}
|
||
|
||
/* Delete the single-step breakpoints of the threads that just
|
||
stopped. */
|
||
|
||
static void
|
||
delete_just_stopped_threads_single_step_breakpoints (void)
|
||
{
|
||
for_each_just_stopped_thread (delete_single_step_breakpoints);
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
print_target_wait_results (ptid_t waiton_ptid, ptid_t result_ptid,
|
||
const struct target_waitstatus &ws)
|
||
{
|
||
infrun_debug_printf ("target_wait (%s [%s], status) =",
|
||
waiton_ptid.to_string ().c_str (),
|
||
target_pid_to_str (waiton_ptid).c_str ());
|
||
infrun_debug_printf (" %s [%s],",
|
||
result_ptid.to_string ().c_str (),
|
||
target_pid_to_str (result_ptid).c_str ());
|
||
infrun_debug_printf (" %s", ws.to_string ().c_str ());
|
||
}
|
||
|
||
/* Select a thread at random, out of those which are resumed and have
|
||
had events. */
|
||
|
||
static struct thread_info *
|
||
random_pending_event_thread (inferior *inf, ptid_t waiton_ptid)
|
||
{
|
||
process_stratum_target *proc_target = inf->process_target ();
|
||
thread_info *thread
|
||
= proc_target->random_resumed_with_pending_wait_status (inf, waiton_ptid);
|
||
|
||
if (thread == nullptr)
|
||
{
|
||
infrun_debug_printf ("None found.");
|
||
return nullptr;
|
||
}
|
||
|
||
infrun_debug_printf ("Found %s.", thread->ptid.to_string ().c_str ());
|
||
gdb_assert (thread->resumed ());
|
||
gdb_assert (thread->has_pending_waitstatus ());
|
||
|
||
return thread;
|
||
}
|
||
|
||
/* Wrapper for target_wait that first checks whether threads have
|
||
pending statuses to report before actually asking the target for
|
||
more events. INF is the inferior we're using to call target_wait
|
||
on. */
|
||
|
||
static ptid_t
|
||
do_target_wait_1 (inferior *inf, ptid_t ptid,
|
||
target_waitstatus *status, target_wait_flags options)
|
||
{
|
||
struct thread_info *tp;
|
||
|
||
/* We know that we are looking for an event in the target of inferior
|
||
INF, but we don't know which thread the event might come from. As
|
||
such we want to make sure that INFERIOR_PTID is reset so that none of
|
||
the wait code relies on it - doing so is always a mistake. */
|
||
switch_to_inferior_no_thread (inf);
|
||
|
||
/* First check if there is a resumed thread with a wait status
|
||
pending. */
|
||
if (ptid == minus_one_ptid || ptid.is_pid ())
|
||
{
|
||
tp = random_pending_event_thread (inf, ptid);
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf ("Waiting for specific thread %s.",
|
||
ptid.to_string ().c_str ());
|
||
|
||
/* We have a specific thread to check. */
|
||
tp = find_thread_ptid (inf, ptid);
|
||
gdb_assert (tp != NULL);
|
||
if (!tp->has_pending_waitstatus ())
|
||
tp = NULL;
|
||
}
|
||
|
||
if (tp != NULL
|
||
&& (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT
|
||
|| tp->stop_reason () == TARGET_STOPPED_BY_HW_BREAKPOINT))
|
||
{
|
||
struct regcache *regcache = get_thread_regcache (tp);
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
CORE_ADDR pc;
|
||
int discard = 0;
|
||
|
||
pc = regcache_read_pc (regcache);
|
||
|
||
if (pc != tp->stop_pc ())
|
||
{
|
||
infrun_debug_printf ("PC of %s changed. was=%s, now=%s",
|
||
tp->ptid.to_string ().c_str (),
|
||
paddress (gdbarch, tp->stop_pc ()),
|
||
paddress (gdbarch, pc));
|
||
discard = 1;
|
||
}
|
||
else if (!breakpoint_inserted_here_p (regcache->aspace (), pc))
|
||
{
|
||
infrun_debug_printf ("previous breakpoint of %s, at %s gone",
|
||
tp->ptid.to_string ().c_str (),
|
||
paddress (gdbarch, pc));
|
||
|
||
discard = 1;
|
||
}
|
||
|
||
if (discard)
|
||
{
|
||
infrun_debug_printf ("pending event of %s cancelled.",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
tp->clear_pending_waitstatus ();
|
||
target_waitstatus ws;
|
||
ws.set_spurious ();
|
||
tp->set_pending_waitstatus (ws);
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON);
|
||
}
|
||
}
|
||
|
||
if (tp != NULL)
|
||
{
|
||
infrun_debug_printf ("Using pending wait status %s for %s.",
|
||
tp->pending_waitstatus ().to_string ().c_str (),
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
/* Now that we've selected our final event LWP, un-adjust its PC
|
||
if it was a software breakpoint (and the target doesn't
|
||
always adjust the PC itself). */
|
||
if (tp->stop_reason () == TARGET_STOPPED_BY_SW_BREAKPOINT
|
||
&& !target_supports_stopped_by_sw_breakpoint ())
|
||
{
|
||
struct regcache *regcache;
|
||
struct gdbarch *gdbarch;
|
||
int decr_pc;
|
||
|
||
regcache = get_thread_regcache (tp);
|
||
gdbarch = regcache->arch ();
|
||
|
||
decr_pc = gdbarch_decr_pc_after_break (gdbarch);
|
||
if (decr_pc != 0)
|
||
{
|
||
CORE_ADDR pc;
|
||
|
||
pc = regcache_read_pc (regcache);
|
||
regcache_write_pc (regcache, pc + decr_pc);
|
||
}
|
||
}
|
||
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_NO_REASON);
|
||
*status = tp->pending_waitstatus ();
|
||
tp->clear_pending_waitstatus ();
|
||
|
||
/* Wake up the event loop again, until all pending events are
|
||
processed. */
|
||
if (target_is_async_p ())
|
||
mark_async_event_handler (infrun_async_inferior_event_token);
|
||
return tp->ptid;
|
||
}
|
||
|
||
/* But if we don't find one, we'll have to wait. */
|
||
|
||
/* We can't ask a non-async target to do a non-blocking wait, so this will be
|
||
a blocking wait. */
|
||
if (!target_can_async_p ())
|
||
options &= ~TARGET_WNOHANG;
|
||
|
||
return target_wait (ptid, status, options);
|
||
}
|
||
|
||
/* Wrapper for target_wait that first checks whether threads have
|
||
pending statuses to report before actually asking the target for
|
||
more events. Polls for events from all inferiors/targets. */
|
||
|
||
static bool
|
||
do_target_wait (execution_control_state *ecs, target_wait_flags options)
|
||
{
|
||
int num_inferiors = 0;
|
||
int random_selector;
|
||
|
||
/* For fairness, we pick the first inferior/target to poll at random
|
||
out of all inferiors that may report events, and then continue
|
||
polling the rest of the inferior list starting from that one in a
|
||
circular fashion until the whole list is polled once. */
|
||
|
||
auto inferior_matches = [] (inferior *inf)
|
||
{
|
||
return inf->process_target () != nullptr;
|
||
};
|
||
|
||
/* First see how many matching inferiors we have. */
|
||
for (inferior *inf : all_inferiors ())
|
||
if (inferior_matches (inf))
|
||
num_inferiors++;
|
||
|
||
if (num_inferiors == 0)
|
||
{
|
||
ecs->ws.set_ignore ();
|
||
return false;
|
||
}
|
||
|
||
/* Now randomly pick an inferior out of those that matched. */
|
||
random_selector = (int)
|
||
((num_inferiors * (double) rand ()) / (RAND_MAX + 1.0));
|
||
|
||
if (num_inferiors > 1)
|
||
infrun_debug_printf ("Found %d inferiors, starting at #%d",
|
||
num_inferiors, random_selector);
|
||
|
||
/* Select the Nth inferior that matched. */
|
||
|
||
inferior *selected = nullptr;
|
||
|
||
for (inferior *inf : all_inferiors ())
|
||
if (inferior_matches (inf))
|
||
if (random_selector-- == 0)
|
||
{
|
||
selected = inf;
|
||
break;
|
||
}
|
||
|
||
/* Now poll for events out of each of the matching inferior's
|
||
targets, starting from the selected one. */
|
||
|
||
auto do_wait = [&] (inferior *inf)
|
||
{
|
||
ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, options);
|
||
ecs->target = inf->process_target ();
|
||
return (ecs->ws.kind () != TARGET_WAITKIND_IGNORE);
|
||
};
|
||
|
||
/* Needed in 'all-stop + target-non-stop' mode, because we end up
|
||
here spuriously after the target is all stopped and we've already
|
||
reported the stop to the user, polling for events. */
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
intrusive_list_iterator<inferior> start
|
||
= inferior_list.iterator_to (*selected);
|
||
|
||
for (intrusive_list_iterator<inferior> it = start;
|
||
it != inferior_list.end ();
|
||
++it)
|
||
{
|
||
inferior *inf = &*it;
|
||
|
||
if (inferior_matches (inf) && do_wait (inf))
|
||
return true;
|
||
}
|
||
|
||
for (intrusive_list_iterator<inferior> it = inferior_list.begin ();
|
||
it != start;
|
||
++it)
|
||
{
|
||
inferior *inf = &*it;
|
||
|
||
if (inferior_matches (inf) && do_wait (inf))
|
||
return true;
|
||
}
|
||
|
||
ecs->ws.set_ignore ();
|
||
return false;
|
||
}
|
||
|
||
/* An event reported by wait_one. */
|
||
|
||
struct wait_one_event
|
||
{
|
||
/* The target the event came out of. */
|
||
process_stratum_target *target;
|
||
|
||
/* The PTID the event was for. */
|
||
ptid_t ptid;
|
||
|
||
/* The waitstatus. */
|
||
target_waitstatus ws;
|
||
};
|
||
|
||
static bool handle_one (const wait_one_event &event);
|
||
|
||
/* Prepare and stabilize the inferior for detaching it. E.g.,
|
||
detaching while a thread is displaced stepping is a recipe for
|
||
crashing it, as nothing would readjust the PC out of the scratch
|
||
pad. */
|
||
|
||
void
|
||
prepare_for_detach (void)
|
||
{
|
||
struct inferior *inf = current_inferior ();
|
||
ptid_t pid_ptid = ptid_t (inf->pid);
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
scoped_restore restore_detaching = make_scoped_restore (&inf->detaching, true);
|
||
|
||
/* Remove all threads of INF from the global step-over chain. We
|
||
want to stop any ongoing step-over, not start any new one. */
|
||
thread_step_over_list_safe_range range
|
||
= make_thread_step_over_list_safe_range (global_thread_step_over_list);
|
||
|
||
for (thread_info *tp : range)
|
||
if (tp->inf == inf)
|
||
{
|
||
infrun_debug_printf ("removing thread %s from global step over chain",
|
||
tp->ptid.to_string ().c_str ());
|
||
global_thread_step_over_chain_remove (tp);
|
||
}
|
||
|
||
/* If we were already in the middle of an inline step-over, and the
|
||
thread stepping belongs to the inferior we're detaching, we need
|
||
to restart the threads of other inferiors. */
|
||
if (step_over_info.thread != -1)
|
||
{
|
||
infrun_debug_printf ("inline step-over in-process while detaching");
|
||
|
||
thread_info *thr = find_thread_global_id (step_over_info.thread);
|
||
if (thr->inf == inf)
|
||
{
|
||
/* Since we removed threads of INF from the step-over chain,
|
||
we know this won't start a step-over for INF. */
|
||
clear_step_over_info ();
|
||
|
||
if (target_is_non_stop_p ())
|
||
{
|
||
/* Start a new step-over in another thread if there's
|
||
one that needs it. */
|
||
start_step_over ();
|
||
|
||
/* Restart all other threads (except the
|
||
previously-stepping thread, since that one is still
|
||
running). */
|
||
if (!step_over_info_valid_p ())
|
||
restart_threads (thr);
|
||
}
|
||
}
|
||
}
|
||
|
||
if (displaced_step_in_progress (inf))
|
||
{
|
||
infrun_debug_printf ("displaced-stepping in-process while detaching");
|
||
|
||
/* Stop threads currently displaced stepping, aborting it. */
|
||
|
||
for (thread_info *thr : inf->non_exited_threads ())
|
||
{
|
||
if (thr->displaced_step_state.in_progress ())
|
||
{
|
||
if (thr->executing ())
|
||
{
|
||
if (!thr->stop_requested)
|
||
{
|
||
target_stop (thr->ptid);
|
||
thr->stop_requested = true;
|
||
}
|
||
}
|
||
else
|
||
thr->set_resumed (false);
|
||
}
|
||
}
|
||
|
||
while (displaced_step_in_progress (inf))
|
||
{
|
||
wait_one_event event;
|
||
|
||
event.target = inf->process_target ();
|
||
event.ptid = do_target_wait_1 (inf, pid_ptid, &event.ws, 0);
|
||
|
||
if (debug_infrun)
|
||
print_target_wait_results (pid_ptid, event.ptid, event.ws);
|
||
|
||
handle_one (event);
|
||
}
|
||
|
||
/* It's OK to leave some of the threads of INF stopped, since
|
||
they'll be detached shortly. */
|
||
}
|
||
}
|
||
|
||
/* Wait for control to return from inferior to debugger.
|
||
|
||
If inferior gets a signal, we may decide to start it up again
|
||
instead of returning. That is why there is a loop in this function.
|
||
When this function actually returns it means the inferior
|
||
should be left stopped and GDB should read more commands. */
|
||
|
||
static void
|
||
wait_for_inferior (inferior *inf)
|
||
{
|
||
infrun_debug_printf ("wait_for_inferior ()");
|
||
|
||
SCOPE_EXIT { delete_just_stopped_threads_infrun_breakpoints (); };
|
||
|
||
/* If an error happens while handling the event, propagate GDB's
|
||
knowledge of the executing state to the frontend/user running
|
||
state. */
|
||
scoped_finish_thread_state finish_state
|
||
(inf->process_target (), minus_one_ptid);
|
||
|
||
while (1)
|
||
{
|
||
struct execution_control_state ecss;
|
||
struct execution_control_state *ecs = &ecss;
|
||
|
||
overlay_cache_invalid = 1;
|
||
|
||
/* Flush target cache before starting to handle each event.
|
||
Target was running and cache could be stale. This is just a
|
||
heuristic. Running threads may modify target memory, but we
|
||
don't get any event. */
|
||
target_dcache_invalidate ();
|
||
|
||
ecs->ptid = do_target_wait_1 (inf, minus_one_ptid, &ecs->ws, 0);
|
||
ecs->target = inf->process_target ();
|
||
|
||
if (debug_infrun)
|
||
print_target_wait_results (minus_one_ptid, ecs->ptid, ecs->ws);
|
||
|
||
/* Now figure out what to do with the result of the result. */
|
||
handle_inferior_event (ecs);
|
||
|
||
if (!ecs->wait_some_more)
|
||
break;
|
||
}
|
||
|
||
/* No error, don't finish the state yet. */
|
||
finish_state.release ();
|
||
}
|
||
|
||
/* Cleanup that reinstalls the readline callback handler, if the
|
||
target is running in the background. If while handling the target
|
||
event something triggered a secondary prompt, like e.g., a
|
||
pagination prompt, we'll have removed the callback handler (see
|
||
gdb_readline_wrapper_line). Need to do this as we go back to the
|
||
event loop, ready to process further input. Note this has no
|
||
effect if the handler hasn't actually been removed, because calling
|
||
rl_callback_handler_install resets the line buffer, thus losing
|
||
input. */
|
||
|
||
static void
|
||
reinstall_readline_callback_handler_cleanup ()
|
||
{
|
||
struct ui *ui = current_ui;
|
||
|
||
if (!ui->async)
|
||
{
|
||
/* We're not going back to the top level event loop yet. Don't
|
||
install the readline callback, as it'd prep the terminal,
|
||
readline-style (raw, noecho) (e.g., --batch). We'll install
|
||
it the next time the prompt is displayed, when we're ready
|
||
for input. */
|
||
return;
|
||
}
|
||
|
||
if (ui->command_editing && ui->prompt_state != PROMPT_BLOCKED)
|
||
gdb_rl_callback_handler_reinstall ();
|
||
}
|
||
|
||
/* Clean up the FSMs of threads that are now stopped. In non-stop,
|
||
that's just the event thread. In all-stop, that's all threads. */
|
||
|
||
static void
|
||
clean_up_just_stopped_threads_fsms (struct execution_control_state *ecs)
|
||
{
|
||
if (ecs->event_thread != nullptr
|
||
&& ecs->event_thread->thread_fsm () != nullptr)
|
||
ecs->event_thread->thread_fsm ()->clean_up (ecs->event_thread);
|
||
|
||
if (!non_stop)
|
||
{
|
||
for (thread_info *thr : all_non_exited_threads ())
|
||
{
|
||
if (thr->thread_fsm () == nullptr)
|
||
continue;
|
||
if (thr == ecs->event_thread)
|
||
continue;
|
||
|
||
switch_to_thread (thr);
|
||
thr->thread_fsm ()->clean_up (thr);
|
||
}
|
||
|
||
if (ecs->event_thread != nullptr)
|
||
switch_to_thread (ecs->event_thread);
|
||
}
|
||
}
|
||
|
||
/* Helper for all_uis_check_sync_execution_done that works on the
|
||
current UI. */
|
||
|
||
static void
|
||
check_curr_ui_sync_execution_done (void)
|
||
{
|
||
struct ui *ui = current_ui;
|
||
|
||
if (ui->prompt_state == PROMPT_NEEDED
|
||
&& ui->async
|
||
&& !gdb_in_secondary_prompt_p (ui))
|
||
{
|
||
target_terminal::ours ();
|
||
gdb::observers::sync_execution_done.notify ();
|
||
ui_register_input_event_handler (ui);
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
all_uis_check_sync_execution_done (void)
|
||
{
|
||
SWITCH_THRU_ALL_UIS ()
|
||
{
|
||
check_curr_ui_sync_execution_done ();
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
all_uis_on_sync_execution_starting (void)
|
||
{
|
||
SWITCH_THRU_ALL_UIS ()
|
||
{
|
||
if (current_ui->prompt_state == PROMPT_NEEDED)
|
||
async_disable_stdin ();
|
||
}
|
||
}
|
||
|
||
/* Asynchronous version of wait_for_inferior. It is called by the
|
||
event loop whenever a change of state is detected on the file
|
||
descriptor corresponding to the target. It can be called more than
|
||
once to complete a single execution command. In such cases we need
|
||
to keep the state in a global variable ECSS. If it is the last time
|
||
that this function is called for a single execution command, then
|
||
report to the user that the inferior has stopped, and do the
|
||
necessary cleanups. */
|
||
|
||
void
|
||
fetch_inferior_event ()
|
||
{
|
||
INFRUN_SCOPED_DEBUG_ENTER_EXIT;
|
||
|
||
struct execution_control_state ecss;
|
||
struct execution_control_state *ecs = &ecss;
|
||
int cmd_done = 0;
|
||
|
||
/* Events are always processed with the main UI as current UI. This
|
||
way, warnings, debug output, etc. are always consistently sent to
|
||
the main console. */
|
||
scoped_restore save_ui = make_scoped_restore (¤t_ui, main_ui);
|
||
|
||
/* Temporarily disable pagination. Otherwise, the user would be
|
||
given an option to press 'q' to quit, which would cause an early
|
||
exit and could leave GDB in a half-baked state. */
|
||
scoped_restore save_pagination
|
||
= make_scoped_restore (&pagination_enabled, false);
|
||
|
||
/* End up with readline processing input, if necessary. */
|
||
{
|
||
SCOPE_EXIT { reinstall_readline_callback_handler_cleanup (); };
|
||
|
||
/* We're handling a live event, so make sure we're doing live
|
||
debugging. If we're looking at traceframes while the target is
|
||
running, we're going to need to get back to that mode after
|
||
handling the event. */
|
||
gdb::optional<scoped_restore_current_traceframe> maybe_restore_traceframe;
|
||
if (non_stop)
|
||
{
|
||
maybe_restore_traceframe.emplace ();
|
||
set_current_traceframe (-1);
|
||
}
|
||
|
||
/* The user/frontend should not notice a thread switch due to
|
||
internal events. Make sure we revert to the user selected
|
||
thread and frame after handling the event and running any
|
||
breakpoint commands. */
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
overlay_cache_invalid = 1;
|
||
/* Flush target cache before starting to handle each event. Target
|
||
was running and cache could be stale. This is just a heuristic.
|
||
Running threads may modify target memory, but we don't get any
|
||
event. */
|
||
target_dcache_invalidate ();
|
||
|
||
scoped_restore save_exec_dir
|
||
= make_scoped_restore (&execution_direction,
|
||
target_execution_direction ());
|
||
|
||
/* Allow targets to pause their resumed threads while we handle
|
||
the event. */
|
||
scoped_disable_commit_resumed disable_commit_resumed ("handling event");
|
||
|
||
if (!do_target_wait (ecs, TARGET_WNOHANG))
|
||
{
|
||
infrun_debug_printf ("do_target_wait returned no event");
|
||
disable_commit_resumed.reset_and_commit ();
|
||
return;
|
||
}
|
||
|
||
gdb_assert (ecs->ws.kind () != TARGET_WAITKIND_IGNORE);
|
||
|
||
/* Switch to the target that generated the event, so we can do
|
||
target calls. */
|
||
switch_to_target_no_thread (ecs->target);
|
||
|
||
if (debug_infrun)
|
||
print_target_wait_results (minus_one_ptid, ecs->ptid, ecs->ws);
|
||
|
||
/* If an error happens while handling the event, propagate GDB's
|
||
knowledge of the executing state to the frontend/user running
|
||
state. */
|
||
ptid_t finish_ptid = !target_is_non_stop_p () ? minus_one_ptid : ecs->ptid;
|
||
scoped_finish_thread_state finish_state (ecs->target, finish_ptid);
|
||
|
||
/* Get executed before scoped_restore_current_thread above to apply
|
||
still for the thread which has thrown the exception. */
|
||
auto defer_bpstat_clear
|
||
= make_scope_exit (bpstat_clear_actions);
|
||
auto defer_delete_threads
|
||
= make_scope_exit (delete_just_stopped_threads_infrun_breakpoints);
|
||
|
||
/* Now figure out what to do with the result of the result. */
|
||
handle_inferior_event (ecs);
|
||
|
||
if (!ecs->wait_some_more)
|
||
{
|
||
struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
|
||
bool should_stop = true;
|
||
struct thread_info *thr = ecs->event_thread;
|
||
|
||
delete_just_stopped_threads_infrun_breakpoints ();
|
||
|
||
if (thr != nullptr && thr->thread_fsm () != nullptr)
|
||
should_stop = thr->thread_fsm ()->should_stop (thr);
|
||
|
||
if (!should_stop)
|
||
{
|
||
keep_going (ecs);
|
||
}
|
||
else
|
||
{
|
||
bool should_notify_stop = true;
|
||
int proceeded = 0;
|
||
|
||
clean_up_just_stopped_threads_fsms (ecs);
|
||
|
||
if (thr != nullptr && thr->thread_fsm () != nullptr)
|
||
should_notify_stop
|
||
= thr->thread_fsm ()->should_notify_stop ();
|
||
|
||
if (should_notify_stop)
|
||
{
|
||
/* We may not find an inferior if this was a process exit. */
|
||
if (inf == NULL || inf->control.stop_soon == NO_STOP_QUIETLY)
|
||
proceeded = normal_stop ();
|
||
}
|
||
|
||
if (!proceeded)
|
||
{
|
||
inferior_event_handler (INF_EXEC_COMPLETE);
|
||
cmd_done = 1;
|
||
}
|
||
|
||
/* If we got a TARGET_WAITKIND_NO_RESUMED event, then the
|
||
previously selected thread is gone. We have two
|
||
choices - switch to no thread selected, or restore the
|
||
previously selected thread (now exited). We chose the
|
||
later, just because that's what GDB used to do. After
|
||
this, "info threads" says "The current thread <Thread
|
||
ID 2> has terminated." instead of "No thread
|
||
selected.". */
|
||
if (!non_stop
|
||
&& cmd_done
|
||
&& ecs->ws.kind () != TARGET_WAITKIND_NO_RESUMED)
|
||
restore_thread.dont_restore ();
|
||
}
|
||
}
|
||
|
||
defer_delete_threads.release ();
|
||
defer_bpstat_clear.release ();
|
||
|
||
/* No error, don't finish the thread states yet. */
|
||
finish_state.release ();
|
||
|
||
disable_commit_resumed.reset_and_commit ();
|
||
|
||
/* This scope is used to ensure that readline callbacks are
|
||
reinstalled here. */
|
||
}
|
||
|
||
/* If a UI was in sync execution mode, and now isn't, restore its
|
||
prompt (a synchronous execution command has finished, and we're
|
||
ready for input). */
|
||
all_uis_check_sync_execution_done ();
|
||
|
||
if (cmd_done
|
||
&& exec_done_display_p
|
||
&& (inferior_ptid == null_ptid
|
||
|| inferior_thread ()->state != THREAD_RUNNING))
|
||
gdb_printf (_("completed.\n"));
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
set_step_info (thread_info *tp, struct frame_info *frame,
|
||
struct symtab_and_line sal)
|
||
{
|
||
/* This can be removed once this function no longer implicitly relies on the
|
||
inferior_ptid value. */
|
||
gdb_assert (inferior_ptid == tp->ptid);
|
||
|
||
tp->control.step_frame_id = get_frame_id (frame);
|
||
tp->control.step_stack_frame_id = get_stack_frame_id (frame);
|
||
|
||
tp->current_symtab = sal.symtab;
|
||
tp->current_line = sal.line;
|
||
|
||
infrun_debug_printf
|
||
("symtab = %s, line = %d, step_frame_id = %s, step_stack_frame_id = %s",
|
||
tp->current_symtab != nullptr ? tp->current_symtab->filename : "<null>",
|
||
tp->current_line,
|
||
tp->control.step_frame_id.to_string ().c_str (),
|
||
tp->control.step_stack_frame_id.to_string ().c_str ());
|
||
}
|
||
|
||
/* Clear context switchable stepping state. */
|
||
|
||
void
|
||
init_thread_stepping_state (struct thread_info *tss)
|
||
{
|
||
tss->stepped_breakpoint = 0;
|
||
tss->stepping_over_breakpoint = 0;
|
||
tss->stepping_over_watchpoint = 0;
|
||
tss->step_after_step_resume_breakpoint = 0;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
set_last_target_status (process_stratum_target *target, ptid_t ptid,
|
||
const target_waitstatus &status)
|
||
{
|
||
target_last_proc_target = target;
|
||
target_last_wait_ptid = ptid;
|
||
target_last_waitstatus = status;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
get_last_target_status (process_stratum_target **target, ptid_t *ptid,
|
||
target_waitstatus *status)
|
||
{
|
||
if (target != nullptr)
|
||
*target = target_last_proc_target;
|
||
if (ptid != nullptr)
|
||
*ptid = target_last_wait_ptid;
|
||
if (status != nullptr)
|
||
*status = target_last_waitstatus;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
nullify_last_target_wait_ptid (void)
|
||
{
|
||
target_last_proc_target = nullptr;
|
||
target_last_wait_ptid = minus_one_ptid;
|
||
target_last_waitstatus = {};
|
||
}
|
||
|
||
/* Switch thread contexts. */
|
||
|
||
static void
|
||
context_switch (execution_control_state *ecs)
|
||
{
|
||
if (ecs->ptid != inferior_ptid
|
||
&& (inferior_ptid == null_ptid
|
||
|| ecs->event_thread != inferior_thread ()))
|
||
{
|
||
infrun_debug_printf ("Switching context from %s to %s",
|
||
inferior_ptid.to_string ().c_str (),
|
||
ecs->ptid.to_string ().c_str ());
|
||
}
|
||
|
||
switch_to_thread (ecs->event_thread);
|
||
}
|
||
|
||
/* If the target can't tell whether we've hit breakpoints
|
||
(target_supports_stopped_by_sw_breakpoint), and we got a SIGTRAP,
|
||
check whether that could have been caused by a breakpoint. If so,
|
||
adjust the PC, per gdbarch_decr_pc_after_break. */
|
||
|
||
static void
|
||
adjust_pc_after_break (struct thread_info *thread,
|
||
const target_waitstatus &ws)
|
||
{
|
||
struct regcache *regcache;
|
||
struct gdbarch *gdbarch;
|
||
CORE_ADDR breakpoint_pc, decr_pc;
|
||
|
||
/* If we've hit a breakpoint, we'll normally be stopped with SIGTRAP. If
|
||
we aren't, just return.
|
||
|
||
We assume that waitkinds other than TARGET_WAITKIND_STOPPED are not
|
||
affected by gdbarch_decr_pc_after_break. Other waitkinds which are
|
||
implemented by software breakpoints should be handled through the normal
|
||
breakpoint layer.
|
||
|
||
NOTE drow/2004-01-31: On some targets, breakpoints may generate
|
||
different signals (SIGILL or SIGEMT for instance), but it is less
|
||
clear where the PC is pointing afterwards. It may not match
|
||
gdbarch_decr_pc_after_break. I don't know any specific target that
|
||
generates these signals at breakpoints (the code has been in GDB since at
|
||
least 1992) so I can not guess how to handle them here.
|
||
|
||
In earlier versions of GDB, a target with
|
||
gdbarch_have_nonsteppable_watchpoint would have the PC after hitting a
|
||
watchpoint affected by gdbarch_decr_pc_after_break. I haven't found any
|
||
target with both of these set in GDB history, and it seems unlikely to be
|
||
correct, so gdbarch_have_nonsteppable_watchpoint is not checked here. */
|
||
|
||
if (ws.kind () != TARGET_WAITKIND_STOPPED)
|
||
return;
|
||
|
||
if (ws.sig () != GDB_SIGNAL_TRAP)
|
||
return;
|
||
|
||
/* In reverse execution, when a breakpoint is hit, the instruction
|
||
under it has already been de-executed. The reported PC always
|
||
points at the breakpoint address, so adjusting it further would
|
||
be wrong. E.g., consider this case on a decr_pc_after_break == 1
|
||
architecture:
|
||
|
||
B1 0x08000000 : INSN1
|
||
B2 0x08000001 : INSN2
|
||
0x08000002 : INSN3
|
||
PC -> 0x08000003 : INSN4
|
||
|
||
Say you're stopped at 0x08000003 as above. Reverse continuing
|
||
from that point should hit B2 as below. Reading the PC when the
|
||
SIGTRAP is reported should read 0x08000001 and INSN2 should have
|
||
been de-executed already.
|
||
|
||
B1 0x08000000 : INSN1
|
||
B2 PC -> 0x08000001 : INSN2
|
||
0x08000002 : INSN3
|
||
0x08000003 : INSN4
|
||
|
||
We can't apply the same logic as for forward execution, because
|
||
we would wrongly adjust the PC to 0x08000000, since there's a
|
||
breakpoint at PC - 1. We'd then report a hit on B1, although
|
||
INSN1 hadn't been de-executed yet. Doing nothing is the correct
|
||
behaviour. */
|
||
if (execution_direction == EXEC_REVERSE)
|
||
return;
|
||
|
||
/* If the target can tell whether the thread hit a SW breakpoint,
|
||
trust it. Targets that can tell also adjust the PC
|
||
themselves. */
|
||
if (target_supports_stopped_by_sw_breakpoint ())
|
||
return;
|
||
|
||
/* Note that relying on whether a breakpoint is planted in memory to
|
||
determine this can fail. E.g,. the breakpoint could have been
|
||
removed since. Or the thread could have been told to step an
|
||
instruction the size of a breakpoint instruction, and only
|
||
_after_ was a breakpoint inserted at its address. */
|
||
|
||
/* If this target does not decrement the PC after breakpoints, then
|
||
we have nothing to do. */
|
||
regcache = get_thread_regcache (thread);
|
||
gdbarch = regcache->arch ();
|
||
|
||
decr_pc = gdbarch_decr_pc_after_break (gdbarch);
|
||
if (decr_pc == 0)
|
||
return;
|
||
|
||
const address_space *aspace = regcache->aspace ();
|
||
|
||
/* Find the location where (if we've hit a breakpoint) the
|
||
breakpoint would be. */
|
||
breakpoint_pc = regcache_read_pc (regcache) - decr_pc;
|
||
|
||
/* If the target can't tell whether a software breakpoint triggered,
|
||
fallback to figuring it out based on breakpoints we think were
|
||
inserted in the target, and on whether the thread was stepped or
|
||
continued. */
|
||
|
||
/* Check whether there actually is a software breakpoint inserted at
|
||
that location.
|
||
|
||
If in non-stop mode, a race condition is possible where we've
|
||
removed a breakpoint, but stop events for that breakpoint were
|
||
already queued and arrive later. To suppress those spurious
|
||
SIGTRAPs, we keep a list of such breakpoint locations for a bit,
|
||
and retire them after a number of stop events are reported. Note
|
||
this is an heuristic and can thus get confused. The real fix is
|
||
to get the "stopped by SW BP and needs adjustment" info out of
|
||
the target/kernel (and thus never reach here; see above). */
|
||
if (software_breakpoint_inserted_here_p (aspace, breakpoint_pc)
|
||
|| (target_is_non_stop_p ()
|
||
&& moribund_breakpoint_here_p (aspace, breakpoint_pc)))
|
||
{
|
||
gdb::optional<scoped_restore_tmpl<int>> restore_operation_disable;
|
||
|
||
if (record_full_is_used ())
|
||
restore_operation_disable.emplace
|
||
(record_full_gdb_operation_disable_set ());
|
||
|
||
/* When using hardware single-step, a SIGTRAP is reported for both
|
||
a completed single-step and a software breakpoint. Need to
|
||
differentiate between the two, as the latter needs adjusting
|
||
but the former does not.
|
||
|
||
The SIGTRAP can be due to a completed hardware single-step only if
|
||
- we didn't insert software single-step breakpoints
|
||
- this thread is currently being stepped
|
||
|
||
If any of these events did not occur, we must have stopped due
|
||
to hitting a software breakpoint, and have to back up to the
|
||
breakpoint address.
|
||
|
||
As a special case, we could have hardware single-stepped a
|
||
software breakpoint. In this case (prev_pc == breakpoint_pc),
|
||
we also need to back up to the breakpoint address. */
|
||
|
||
if (thread_has_single_step_breakpoints_set (thread)
|
||
|| !currently_stepping (thread)
|
||
|| (thread->stepped_breakpoint
|
||
&& thread->prev_pc == breakpoint_pc))
|
||
regcache_write_pc (regcache, breakpoint_pc);
|
||
}
|
||
}
|
||
|
||
static bool
|
||
stepped_in_from (struct frame_info *frame, struct frame_id step_frame_id)
|
||
{
|
||
for (frame = get_prev_frame (frame);
|
||
frame != NULL;
|
||
frame = get_prev_frame (frame))
|
||
{
|
||
if (frame_id_eq (get_frame_id (frame), step_frame_id))
|
||
return true;
|
||
|
||
if (get_frame_type (frame) != INLINE_FRAME)
|
||
break;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Look for an inline frame that is marked for skip.
|
||
If PREV_FRAME is TRUE start at the previous frame,
|
||
otherwise start at the current frame. Stop at the
|
||
first non-inline frame, or at the frame where the
|
||
step started. */
|
||
|
||
static bool
|
||
inline_frame_is_marked_for_skip (bool prev_frame, struct thread_info *tp)
|
||
{
|
||
struct frame_info *frame = get_current_frame ();
|
||
|
||
if (prev_frame)
|
||
frame = get_prev_frame (frame);
|
||
|
||
for (; frame != NULL; frame = get_prev_frame (frame))
|
||
{
|
||
const char *fn = NULL;
|
||
symtab_and_line sal;
|
||
struct symbol *sym;
|
||
|
||
if (frame_id_eq (get_frame_id (frame), tp->control.step_frame_id))
|
||
break;
|
||
if (get_frame_type (frame) != INLINE_FRAME)
|
||
break;
|
||
|
||
sal = find_frame_sal (frame);
|
||
sym = get_frame_function (frame);
|
||
|
||
if (sym != NULL)
|
||
fn = sym->print_name ();
|
||
|
||
if (sal.line != 0
|
||
&& function_name_is_marked_for_skip (fn, sal))
|
||
return true;
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* If the event thread has the stop requested flag set, pretend it
|
||
stopped for a GDB_SIGNAL_0 (i.e., as if it stopped due to
|
||
target_stop). */
|
||
|
||
static bool
|
||
handle_stop_requested (struct execution_control_state *ecs)
|
||
{
|
||
if (ecs->event_thread->stop_requested)
|
||
{
|
||
ecs->ws.set_stopped (GDB_SIGNAL_0);
|
||
handle_signal_stop (ecs);
|
||
return true;
|
||
}
|
||
return false;
|
||
}
|
||
|
||
/* Auxiliary function that handles syscall entry/return events.
|
||
It returns true if the inferior should keep going (and GDB
|
||
should ignore the event), or false if the event deserves to be
|
||
processed. */
|
||
|
||
static bool
|
||
handle_syscall_event (struct execution_control_state *ecs)
|
||
{
|
||
struct regcache *regcache;
|
||
int syscall_number;
|
||
|
||
context_switch (ecs);
|
||
|
||
regcache = get_thread_regcache (ecs->event_thread);
|
||
syscall_number = ecs->ws.syscall_number ();
|
||
ecs->event_thread->set_stop_pc (regcache_read_pc (regcache));
|
||
|
||
if (catch_syscall_enabled () > 0
|
||
&& catching_syscall_number (syscall_number))
|
||
{
|
||
infrun_debug_printf ("syscall number=%d", syscall_number);
|
||
|
||
ecs->event_thread->control.stop_bpstat
|
||
= bpstat_stop_status_nowatch (regcache->aspace (),
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->event_thread, ecs->ws);
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return false;
|
||
|
||
if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
|
||
{
|
||
/* Catchpoint hit. */
|
||
return false;
|
||
}
|
||
}
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return false;
|
||
|
||
/* If no catchpoint triggered for this, then keep going. */
|
||
keep_going (ecs);
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Lazily fill in the execution_control_state's stop_func_* fields. */
|
||
|
||
static void
|
||
fill_in_stop_func (struct gdbarch *gdbarch,
|
||
struct execution_control_state *ecs)
|
||
{
|
||
if (!ecs->stop_func_filled_in)
|
||
{
|
||
const block *block;
|
||
const general_symbol_info *gsi;
|
||
|
||
/* Don't care about return value; stop_func_start and stop_func_name
|
||
will both be 0 if it doesn't work. */
|
||
find_pc_partial_function_sym (ecs->event_thread->stop_pc (),
|
||
&gsi,
|
||
&ecs->stop_func_start,
|
||
&ecs->stop_func_end,
|
||
&block);
|
||
ecs->stop_func_name = gsi == nullptr ? nullptr : gsi->print_name ();
|
||
|
||
/* The call to find_pc_partial_function, above, will set
|
||
stop_func_start and stop_func_end to the start and end
|
||
of the range containing the stop pc. If this range
|
||
contains the entry pc for the block (which is always the
|
||
case for contiguous blocks), advance stop_func_start past
|
||
the function's start offset and entrypoint. Note that
|
||
stop_func_start is NOT advanced when in a range of a
|
||
non-contiguous block that does not contain the entry pc. */
|
||
if (block != nullptr
|
||
&& ecs->stop_func_start <= BLOCK_ENTRY_PC (block)
|
||
&& BLOCK_ENTRY_PC (block) < ecs->stop_func_end)
|
||
{
|
||
ecs->stop_func_start
|
||
+= gdbarch_deprecated_function_start_offset (gdbarch);
|
||
|
||
if (gdbarch_skip_entrypoint_p (gdbarch))
|
||
ecs->stop_func_start
|
||
= gdbarch_skip_entrypoint (gdbarch, ecs->stop_func_start);
|
||
}
|
||
|
||
ecs->stop_func_filled_in = 1;
|
||
}
|
||
}
|
||
|
||
|
||
/* Return the STOP_SOON field of the inferior pointed at by ECS. */
|
||
|
||
static enum stop_kind
|
||
get_inferior_stop_soon (execution_control_state *ecs)
|
||
{
|
||
struct inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
|
||
|
||
gdb_assert (inf != NULL);
|
||
return inf->control.stop_soon;
|
||
}
|
||
|
||
/* Poll for one event out of the current target. Store the resulting
|
||
waitstatus in WS, and return the event ptid. Does not block. */
|
||
|
||
static ptid_t
|
||
poll_one_curr_target (struct target_waitstatus *ws)
|
||
{
|
||
ptid_t event_ptid;
|
||
|
||
overlay_cache_invalid = 1;
|
||
|
||
/* Flush target cache before starting to handle each event.
|
||
Target was running and cache could be stale. This is just a
|
||
heuristic. Running threads may modify target memory, but we
|
||
don't get any event. */
|
||
target_dcache_invalidate ();
|
||
|
||
event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG);
|
||
|
||
if (debug_infrun)
|
||
print_target_wait_results (minus_one_ptid, event_ptid, *ws);
|
||
|
||
return event_ptid;
|
||
}
|
||
|
||
/* Wait for one event out of any target. */
|
||
|
||
static wait_one_event
|
||
wait_one ()
|
||
{
|
||
while (1)
|
||
{
|
||
for (inferior *inf : all_inferiors ())
|
||
{
|
||
process_stratum_target *target = inf->process_target ();
|
||
if (target == NULL
|
||
|| !target->is_async_p ()
|
||
|| !target->threads_executing)
|
||
continue;
|
||
|
||
switch_to_inferior_no_thread (inf);
|
||
|
||
wait_one_event event;
|
||
event.target = target;
|
||
event.ptid = poll_one_curr_target (&event.ws);
|
||
|
||
if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED)
|
||
{
|
||
/* If nothing is resumed, remove the target from the
|
||
event loop. */
|
||
target_async (0);
|
||
}
|
||
else if (event.ws.kind () != TARGET_WAITKIND_IGNORE)
|
||
return event;
|
||
}
|
||
|
||
/* Block waiting for some event. */
|
||
|
||
fd_set readfds;
|
||
int nfds = 0;
|
||
|
||
FD_ZERO (&readfds);
|
||
|
||
for (inferior *inf : all_inferiors ())
|
||
{
|
||
process_stratum_target *target = inf->process_target ();
|
||
if (target == NULL
|
||
|| !target->is_async_p ()
|
||
|| !target->threads_executing)
|
||
continue;
|
||
|
||
int fd = target->async_wait_fd ();
|
||
FD_SET (fd, &readfds);
|
||
if (nfds <= fd)
|
||
nfds = fd + 1;
|
||
}
|
||
|
||
if (nfds == 0)
|
||
{
|
||
/* No waitable targets left. All must be stopped. */
|
||
target_waitstatus ws;
|
||
ws.set_no_resumed ();
|
||
return {NULL, minus_one_ptid, std::move (ws)};
|
||
}
|
||
|
||
QUIT;
|
||
|
||
int numfds = interruptible_select (nfds, &readfds, 0, NULL, 0);
|
||
if (numfds < 0)
|
||
{
|
||
if (errno == EINTR)
|
||
continue;
|
||
else
|
||
perror_with_name ("interruptible_select");
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Save the thread's event and stop reason to process it later. */
|
||
|
||
static void
|
||
save_waitstatus (struct thread_info *tp, const target_waitstatus &ws)
|
||
{
|
||
infrun_debug_printf ("saving status %s for %s",
|
||
ws.to_string ().c_str (),
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
/* Record for later. */
|
||
tp->set_pending_waitstatus (ws);
|
||
|
||
if (ws.kind () == TARGET_WAITKIND_STOPPED
|
||
&& ws.sig () == GDB_SIGNAL_TRAP)
|
||
{
|
||
struct regcache *regcache = get_thread_regcache (tp);
|
||
const address_space *aspace = regcache->aspace ();
|
||
CORE_ADDR pc = regcache_read_pc (regcache);
|
||
|
||
adjust_pc_after_break (tp, tp->pending_waitstatus ());
|
||
|
||
scoped_restore_current_thread restore_thread;
|
||
switch_to_thread (tp);
|
||
|
||
if (target_stopped_by_watchpoint ())
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_WATCHPOINT);
|
||
else if (target_supports_stopped_by_sw_breakpoint ()
|
||
&& target_stopped_by_sw_breakpoint ())
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT);
|
||
else if (target_supports_stopped_by_hw_breakpoint ()
|
||
&& target_stopped_by_hw_breakpoint ())
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT);
|
||
else if (!target_supports_stopped_by_hw_breakpoint ()
|
||
&& hardware_breakpoint_inserted_here_p (aspace, pc))
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_HW_BREAKPOINT);
|
||
else if (!target_supports_stopped_by_sw_breakpoint ()
|
||
&& software_breakpoint_inserted_here_p (aspace, pc))
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_SW_BREAKPOINT);
|
||
else if (!thread_has_single_step_breakpoints_set (tp)
|
||
&& currently_stepping (tp))
|
||
tp->set_stop_reason (TARGET_STOPPED_BY_SINGLE_STEP);
|
||
}
|
||
}
|
||
|
||
/* Mark the non-executing threads accordingly. In all-stop, all
|
||
threads of all processes are stopped when we get any event
|
||
reported. In non-stop mode, only the event thread stops. */
|
||
|
||
static void
|
||
mark_non_executing_threads (process_stratum_target *target,
|
||
ptid_t event_ptid,
|
||
const target_waitstatus &ws)
|
||
{
|
||
ptid_t mark_ptid;
|
||
|
||
if (!target_is_non_stop_p ())
|
||
mark_ptid = minus_one_ptid;
|
||
else if (ws.kind () == TARGET_WAITKIND_SIGNALLED
|
||
|| ws.kind () == TARGET_WAITKIND_EXITED)
|
||
{
|
||
/* If we're handling a process exit in non-stop mode, even
|
||
though threads haven't been deleted yet, one would think
|
||
that there is nothing to do, as threads of the dead process
|
||
will be soon deleted, and threads of any other process were
|
||
left running. However, on some targets, threads survive a
|
||
process exit event. E.g., for the "checkpoint" command,
|
||
when the current checkpoint/fork exits, linux-fork.c
|
||
automatically switches to another fork from within
|
||
target_mourn_inferior, by associating the same
|
||
inferior/thread to another fork. We haven't mourned yet at
|
||
this point, but we must mark any threads left in the
|
||
process as not-executing so that finish_thread_state marks
|
||
them stopped (in the user's perspective) if/when we present
|
||
the stop to the user. */
|
||
mark_ptid = ptid_t (event_ptid.pid ());
|
||
}
|
||
else
|
||
mark_ptid = event_ptid;
|
||
|
||
set_executing (target, mark_ptid, false);
|
||
|
||
/* Likewise the resumed flag. */
|
||
set_resumed (target, mark_ptid, false);
|
||
}
|
||
|
||
/* Handle one event after stopping threads. If the eventing thread
|
||
reports back any interesting event, we leave it pending. If the
|
||
eventing thread was in the middle of a displaced step, we
|
||
cancel/finish it, and unless the thread's inferior is being
|
||
detached, put the thread back in the step-over chain. Returns true
|
||
if there are no resumed threads left in the target (thus there's no
|
||
point in waiting further), false otherwise. */
|
||
|
||
static bool
|
||
handle_one (const wait_one_event &event)
|
||
{
|
||
infrun_debug_printf
|
||
("%s %s", event.ws.to_string ().c_str (),
|
||
event.ptid.to_string ().c_str ());
|
||
|
||
if (event.ws.kind () == TARGET_WAITKIND_NO_RESUMED)
|
||
{
|
||
/* All resumed threads exited. */
|
||
return true;
|
||
}
|
||
else if (event.ws.kind () == TARGET_WAITKIND_THREAD_EXITED
|
||
|| event.ws.kind () == TARGET_WAITKIND_EXITED
|
||
|| event.ws.kind () == TARGET_WAITKIND_SIGNALLED)
|
||
{
|
||
/* One thread/process exited/signalled. */
|
||
|
||
thread_info *t = nullptr;
|
||
|
||
/* The target may have reported just a pid. If so, try
|
||
the first non-exited thread. */
|
||
if (event.ptid.is_pid ())
|
||
{
|
||
int pid = event.ptid.pid ();
|
||
inferior *inf = find_inferior_pid (event.target, pid);
|
||
for (thread_info *tp : inf->non_exited_threads ())
|
||
{
|
||
t = tp;
|
||
break;
|
||
}
|
||
|
||
/* If there is no available thread, the event would
|
||
have to be appended to a per-inferior event list,
|
||
which does not exist (and if it did, we'd have
|
||
to adjust run control command to be able to
|
||
resume such an inferior). We assert here instead
|
||
of going into an infinite loop. */
|
||
gdb_assert (t != nullptr);
|
||
|
||
infrun_debug_printf
|
||
("using %s", t->ptid.to_string ().c_str ());
|
||
}
|
||
else
|
||
{
|
||
t = find_thread_ptid (event.target, event.ptid);
|
||
/* Check if this is the first time we see this thread.
|
||
Don't bother adding if it individually exited. */
|
||
if (t == nullptr
|
||
&& event.ws.kind () != TARGET_WAITKIND_THREAD_EXITED)
|
||
t = add_thread (event.target, event.ptid);
|
||
}
|
||
|
||
if (t != nullptr)
|
||
{
|
||
/* Set the threads as non-executing to avoid
|
||
another stop attempt on them. */
|
||
switch_to_thread_no_regs (t);
|
||
mark_non_executing_threads (event.target, event.ptid,
|
||
event.ws);
|
||
save_waitstatus (t, event.ws);
|
||
t->stop_requested = false;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
thread_info *t = find_thread_ptid (event.target, event.ptid);
|
||
if (t == NULL)
|
||
t = add_thread (event.target, event.ptid);
|
||
|
||
t->stop_requested = 0;
|
||
t->set_executing (false);
|
||
t->set_resumed (false);
|
||
t->control.may_range_step = 0;
|
||
|
||
/* This may be the first time we see the inferior report
|
||
a stop. */
|
||
if (t->inf->needs_setup)
|
||
{
|
||
switch_to_thread_no_regs (t);
|
||
setup_inferior (0);
|
||
}
|
||
|
||
if (event.ws.kind () == TARGET_WAITKIND_STOPPED
|
||
&& event.ws.sig () == GDB_SIGNAL_0)
|
||
{
|
||
/* We caught the event that we intended to catch, so
|
||
there's no event to save as pending. */
|
||
|
||
if (displaced_step_finish (t, GDB_SIGNAL_0)
|
||
== DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED)
|
||
{
|
||
/* Add it back to the step-over queue. */
|
||
infrun_debug_printf
|
||
("displaced-step of %s canceled",
|
||
t->ptid.to_string ().c_str ());
|
||
|
||
t->control.trap_expected = 0;
|
||
if (!t->inf->detaching)
|
||
global_thread_step_over_chain_enqueue (t);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
enum gdb_signal sig;
|
||
struct regcache *regcache;
|
||
|
||
infrun_debug_printf
|
||
("target_wait %s, saving status for %s",
|
||
event.ws.to_string ().c_str (),
|
||
t->ptid.to_string ().c_str ());
|
||
|
||
/* Record for later. */
|
||
save_waitstatus (t, event.ws);
|
||
|
||
sig = (event.ws.kind () == TARGET_WAITKIND_STOPPED
|
||
? event.ws.sig () : GDB_SIGNAL_0);
|
||
|
||
if (displaced_step_finish (t, sig)
|
||
== DISPLACED_STEP_FINISH_STATUS_NOT_EXECUTED)
|
||
{
|
||
/* Add it back to the step-over queue. */
|
||
t->control.trap_expected = 0;
|
||
if (!t->inf->detaching)
|
||
global_thread_step_over_chain_enqueue (t);
|
||
}
|
||
|
||
regcache = get_thread_regcache (t);
|
||
t->set_stop_pc (regcache_read_pc (regcache));
|
||
|
||
infrun_debug_printf ("saved stop_pc=%s for %s "
|
||
"(currently_stepping=%d)",
|
||
paddress (target_gdbarch (), t->stop_pc ()),
|
||
t->ptid.to_string ().c_str (),
|
||
currently_stepping (t));
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
stop_all_threads (const char *reason, inferior *inf)
|
||
{
|
||
/* We may need multiple passes to discover all threads. */
|
||
int pass;
|
||
int iterations = 0;
|
||
|
||
gdb_assert (exists_non_stop_target ());
|
||
|
||
INFRUN_SCOPED_DEBUG_START_END ("reason=%s, inf=%d", reason,
|
||
inf != nullptr ? inf->num : -1);
|
||
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
/* Enable thread events on relevant targets. */
|
||
for (auto *target : all_non_exited_process_targets ())
|
||
{
|
||
if (inf != nullptr && inf->process_target () != target)
|
||
continue;
|
||
|
||
switch_to_target_no_thread (target);
|
||
target_thread_events (true);
|
||
}
|
||
|
||
SCOPE_EXIT
|
||
{
|
||
/* Disable thread events on relevant targets. */
|
||
for (auto *target : all_non_exited_process_targets ())
|
||
{
|
||
if (inf != nullptr && inf->process_target () != target)
|
||
continue;
|
||
|
||
switch_to_target_no_thread (target);
|
||
target_thread_events (false);
|
||
}
|
||
|
||
/* Use debug_prefixed_printf directly to get a meaningful function
|
||
name. */
|
||
if (debug_infrun)
|
||
debug_prefixed_printf ("infrun", "stop_all_threads", "done");
|
||
};
|
||
|
||
/* Request threads to stop, and then wait for the stops. Because
|
||
threads we already know about can spawn more threads while we're
|
||
trying to stop them, and we only learn about new threads when we
|
||
update the thread list, do this in a loop, and keep iterating
|
||
until two passes find no threads that need to be stopped. */
|
||
for (pass = 0; pass < 2; pass++, iterations++)
|
||
{
|
||
infrun_debug_printf ("pass=%d, iterations=%d", pass, iterations);
|
||
while (1)
|
||
{
|
||
int waits_needed = 0;
|
||
|
||
for (auto *target : all_non_exited_process_targets ())
|
||
{
|
||
if (inf != nullptr && inf->process_target () != target)
|
||
continue;
|
||
|
||
switch_to_target_no_thread (target);
|
||
update_thread_list ();
|
||
}
|
||
|
||
/* Go through all threads looking for threads that we need
|
||
to tell the target to stop. */
|
||
for (thread_info *t : all_non_exited_threads ())
|
||
{
|
||
if (inf != nullptr && t->inf != inf)
|
||
continue;
|
||
|
||
/* For a single-target setting with an all-stop target,
|
||
we would not even arrive here. For a multi-target
|
||
setting, until GDB is able to handle a mixture of
|
||
all-stop and non-stop targets, simply skip all-stop
|
||
targets' threads. This should be fine due to the
|
||
protection of 'check_multi_target_resumption'. */
|
||
|
||
switch_to_thread_no_regs (t);
|
||
if (!target_is_non_stop_p ())
|
||
continue;
|
||
|
||
if (t->executing ())
|
||
{
|
||
/* If already stopping, don't request a stop again.
|
||
We just haven't seen the notification yet. */
|
||
if (!t->stop_requested)
|
||
{
|
||
infrun_debug_printf (" %s executing, need stop",
|
||
t->ptid.to_string ().c_str ());
|
||
target_stop (t->ptid);
|
||
t->stop_requested = 1;
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf (" %s executing, already stopping",
|
||
t->ptid.to_string ().c_str ());
|
||
}
|
||
|
||
if (t->stop_requested)
|
||
waits_needed++;
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf (" %s not executing",
|
||
t->ptid.to_string ().c_str ());
|
||
|
||
/* The thread may be not executing, but still be
|
||
resumed with a pending status to process. */
|
||
t->set_resumed (false);
|
||
}
|
||
}
|
||
|
||
if (waits_needed == 0)
|
||
break;
|
||
|
||
/* If we find new threads on the second iteration, restart
|
||
over. We want to see two iterations in a row with all
|
||
threads stopped. */
|
||
if (pass > 0)
|
||
pass = -1;
|
||
|
||
for (int i = 0; i < waits_needed; i++)
|
||
{
|
||
wait_one_event event = wait_one ();
|
||
if (handle_one (event))
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Handle a TARGET_WAITKIND_NO_RESUMED event. */
|
||
|
||
static bool
|
||
handle_no_resumed (struct execution_control_state *ecs)
|
||
{
|
||
if (target_can_async_p ())
|
||
{
|
||
bool any_sync = false;
|
||
|
||
for (ui *ui : all_uis ())
|
||
{
|
||
if (ui->prompt_state == PROMPT_BLOCKED)
|
||
{
|
||
any_sync = true;
|
||
break;
|
||
}
|
||
}
|
||
if (!any_sync)
|
||
{
|
||
/* There were no unwaited-for children left in the target, but,
|
||
we're not synchronously waiting for events either. Just
|
||
ignore. */
|
||
|
||
infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED (ignoring: bg)");
|
||
prepare_to_wait (ecs);
|
||
return true;
|
||
}
|
||
}
|
||
|
||
/* Otherwise, if we were running a synchronous execution command, we
|
||
may need to cancel it and give the user back the terminal.
|
||
|
||
In non-stop mode, the target can't tell whether we've already
|
||
consumed previous stop events, so it can end up sending us a
|
||
no-resumed event like so:
|
||
|
||
#0 - thread 1 is left stopped
|
||
|
||
#1 - thread 2 is resumed and hits breakpoint
|
||
-> TARGET_WAITKIND_STOPPED
|
||
|
||
#2 - thread 3 is resumed and exits
|
||
this is the last resumed thread, so
|
||
-> TARGET_WAITKIND_NO_RESUMED
|
||
|
||
#3 - gdb processes stop for thread 2 and decides to re-resume
|
||
it.
|
||
|
||
#4 - gdb processes the TARGET_WAITKIND_NO_RESUMED event.
|
||
thread 2 is now resumed, so the event should be ignored.
|
||
|
||
IOW, if the stop for thread 2 doesn't end a foreground command,
|
||
then we need to ignore the following TARGET_WAITKIND_NO_RESUMED
|
||
event. But it could be that the event meant that thread 2 itself
|
||
(or whatever other thread was the last resumed thread) exited.
|
||
|
||
To address this we refresh the thread list and check whether we
|
||
have resumed threads _now_. In the example above, this removes
|
||
thread 3 from the thread list. If thread 2 was re-resumed, we
|
||
ignore this event. If we find no thread resumed, then we cancel
|
||
the synchronous command and show "no unwaited-for " to the
|
||
user. */
|
||
|
||
inferior *curr_inf = current_inferior ();
|
||
|
||
scoped_restore_current_thread restore_thread;
|
||
|
||
for (auto *target : all_non_exited_process_targets ())
|
||
{
|
||
switch_to_target_no_thread (target);
|
||
update_thread_list ();
|
||
}
|
||
|
||
/* If:
|
||
|
||
- the current target has no thread executing, and
|
||
- the current inferior is native, and
|
||
- the current inferior is the one which has the terminal, and
|
||
- we did nothing,
|
||
|
||
then a Ctrl-C from this point on would remain stuck in the
|
||
kernel, until a thread resumes and dequeues it. That would
|
||
result in the GDB CLI not reacting to Ctrl-C, not able to
|
||
interrupt the program. To address this, if the current inferior
|
||
no longer has any thread executing, we give the terminal to some
|
||
other inferior that has at least one thread executing. */
|
||
bool swap_terminal = true;
|
||
|
||
/* Whether to ignore this TARGET_WAITKIND_NO_RESUMED event, or
|
||
whether to report it to the user. */
|
||
bool ignore_event = false;
|
||
|
||
for (thread_info *thread : all_non_exited_threads ())
|
||
{
|
||
if (swap_terminal && thread->executing ())
|
||
{
|
||
if (thread->inf != curr_inf)
|
||
{
|
||
target_terminal::ours ();
|
||
|
||
switch_to_thread (thread);
|
||
target_terminal::inferior ();
|
||
}
|
||
swap_terminal = false;
|
||
}
|
||
|
||
if (!ignore_event && thread->resumed ())
|
||
{
|
||
/* Either there were no unwaited-for children left in the
|
||
target at some point, but there are now, or some target
|
||
other than the eventing one has unwaited-for children
|
||
left. Just ignore. */
|
||
infrun_debug_printf ("TARGET_WAITKIND_NO_RESUMED "
|
||
"(ignoring: found resumed)");
|
||
|
||
ignore_event = true;
|
||
}
|
||
|
||
if (ignore_event && !swap_terminal)
|
||
break;
|
||
}
|
||
|
||
if (ignore_event)
|
||
{
|
||
switch_to_inferior_no_thread (curr_inf);
|
||
prepare_to_wait (ecs);
|
||
return true;
|
||
}
|
||
|
||
/* Go ahead and report the event. */
|
||
return false;
|
||
}
|
||
|
||
/* Given an execution control state that has been freshly filled in by
|
||
an event from the inferior, figure out what it means and take
|
||
appropriate action.
|
||
|
||
The alternatives are:
|
||
|
||
1) stop_waiting and return; to really stop and return to the
|
||
debugger.
|
||
|
||
2) keep_going and return; to wait for the next event (set
|
||
ecs->event_thread->stepping_over_breakpoint to 1 to single step
|
||
once). */
|
||
|
||
static void
|
||
handle_inferior_event (struct execution_control_state *ecs)
|
||
{
|
||
/* Make sure that all temporary struct value objects that were
|
||
created during the handling of the event get deleted at the
|
||
end. */
|
||
scoped_value_mark free_values;
|
||
|
||
infrun_debug_printf ("%s", ecs->ws.to_string ().c_str ());
|
||
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_IGNORE)
|
||
{
|
||
/* We had an event in the inferior, but we are not interested in
|
||
handling it at this level. The lower layers have already
|
||
done what needs to be done, if anything.
|
||
|
||
One of the possible circumstances for this is when the
|
||
inferior produces output for the console. The inferior has
|
||
not stopped, and we are ignoring the event. Another possible
|
||
circumstance is any event which the lower level knows will be
|
||
reported multiple times without an intervening resume. */
|
||
prepare_to_wait (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_THREAD_EXITED)
|
||
{
|
||
prepare_to_wait (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED
|
||
&& handle_no_resumed (ecs))
|
||
return;
|
||
|
||
/* Cache the last target/ptid/waitstatus. */
|
||
set_last_target_status (ecs->target, ecs->ptid, ecs->ws);
|
||
|
||
/* Always clear state belonging to the previous time we stopped. */
|
||
stop_stack_dummy = STOP_NONE;
|
||
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_NO_RESUMED)
|
||
{
|
||
/* No unwaited-for children left. IOW, all resumed children
|
||
have exited. */
|
||
stop_print_frame = false;
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->ws.kind () != TARGET_WAITKIND_EXITED
|
||
&& ecs->ws.kind () != TARGET_WAITKIND_SIGNALLED)
|
||
{
|
||
ecs->event_thread = find_thread_ptid (ecs->target, ecs->ptid);
|
||
/* If it's a new thread, add it to the thread database. */
|
||
if (ecs->event_thread == NULL)
|
||
ecs->event_thread = add_thread (ecs->target, ecs->ptid);
|
||
|
||
/* Disable range stepping. If the next step request could use a
|
||
range, this will be end up re-enabled then. */
|
||
ecs->event_thread->control.may_range_step = 0;
|
||
}
|
||
|
||
/* Dependent on valid ECS->EVENT_THREAD. */
|
||
adjust_pc_after_break (ecs->event_thread, ecs->ws);
|
||
|
||
/* Dependent on the current PC value modified by adjust_pc_after_break. */
|
||
reinit_frame_cache ();
|
||
|
||
breakpoint_retire_moribund ();
|
||
|
||
/* First, distinguish signals caused by the debugger from signals
|
||
that have to do with the program's own actions. Note that
|
||
breakpoint insns may cause SIGTRAP or SIGILL or SIGEMT, depending
|
||
on the operating system version. Here we detect when a SIGILL or
|
||
SIGEMT is really a breakpoint and change it to SIGTRAP. We do
|
||
something similar for SIGSEGV, since a SIGSEGV will be generated
|
||
when we're trying to execute a breakpoint instruction on a
|
||
non-executable stack. This happens for call dummy breakpoints
|
||
for architectures like SPARC that place call dummies on the
|
||
stack. */
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_STOPPED
|
||
&& (ecs->ws.sig () == GDB_SIGNAL_ILL
|
||
|| ecs->ws.sig () == GDB_SIGNAL_SEGV
|
||
|| ecs->ws.sig () == GDB_SIGNAL_EMT))
|
||
{
|
||
struct regcache *regcache = get_thread_regcache (ecs->event_thread);
|
||
|
||
if (breakpoint_inserted_here_p (regcache->aspace (),
|
||
regcache_read_pc (regcache)))
|
||
{
|
||
infrun_debug_printf ("Treating signal as SIGTRAP");
|
||
ecs->ws.set_stopped (GDB_SIGNAL_TRAP);
|
||
}
|
||
}
|
||
|
||
mark_non_executing_threads (ecs->target, ecs->ptid, ecs->ws);
|
||
|
||
switch (ecs->ws.kind ())
|
||
{
|
||
case TARGET_WAITKIND_LOADED:
|
||
{
|
||
context_switch (ecs);
|
||
/* Ignore gracefully during startup of the inferior, as it might
|
||
be the shell which has just loaded some objects, otherwise
|
||
add the symbols for the newly loaded objects. Also ignore at
|
||
the beginning of an attach or remote session; we will query
|
||
the full list of libraries once the connection is
|
||
established. */
|
||
|
||
stop_kind stop_soon = get_inferior_stop_soon (ecs);
|
||
if (stop_soon == NO_STOP_QUIETLY)
|
||
{
|
||
struct regcache *regcache;
|
||
|
||
regcache = get_thread_regcache (ecs->event_thread);
|
||
|
||
handle_solib_event ();
|
||
|
||
ecs->event_thread->set_stop_pc (regcache_read_pc (regcache));
|
||
ecs->event_thread->control.stop_bpstat
|
||
= bpstat_stop_status_nowatch (regcache->aspace (),
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->event_thread, ecs->ws);
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
|
||
if (bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
|
||
{
|
||
/* A catchpoint triggered. */
|
||
process_event_stop_test (ecs);
|
||
return;
|
||
}
|
||
|
||
/* If requested, stop when the dynamic linker notifies
|
||
gdb of events. This allows the user to get control
|
||
and place breakpoints in initializer routines for
|
||
dynamically loaded objects (among other things). */
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
if (stop_on_solib_events)
|
||
{
|
||
/* Make sure we print "Stopped due to solib-event" in
|
||
normal_stop. */
|
||
stop_print_frame = true;
|
||
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* If we are skipping through a shell, or through shared library
|
||
loading that we aren't interested in, resume the program. If
|
||
we're running the program normally, also resume. */
|
||
if (stop_soon == STOP_QUIETLY || stop_soon == NO_STOP_QUIETLY)
|
||
{
|
||
/* Loading of shared libraries might have changed breakpoint
|
||
addresses. Make sure new breakpoints are inserted. */
|
||
if (stop_soon == NO_STOP_QUIETLY)
|
||
insert_breakpoints ();
|
||
resume (GDB_SIGNAL_0);
|
||
prepare_to_wait (ecs);
|
||
return;
|
||
}
|
||
|
||
/* But stop if we're attaching or setting up a remote
|
||
connection. */
|
||
if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
|
||
|| stop_soon == STOP_QUIETLY_REMOTE)
|
||
{
|
||
infrun_debug_printf ("quietly stopped");
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
|
||
internal_error (__FILE__, __LINE__,
|
||
_("unhandled stop_soon: %d"), (int) stop_soon);
|
||
}
|
||
|
||
case TARGET_WAITKIND_SPURIOUS:
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
context_switch (ecs);
|
||
resume (GDB_SIGNAL_0);
|
||
prepare_to_wait (ecs);
|
||
return;
|
||
|
||
case TARGET_WAITKIND_THREAD_CREATED:
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
context_switch (ecs);
|
||
if (!switch_back_to_stepped_thread (ecs))
|
||
keep_going (ecs);
|
||
return;
|
||
|
||
case TARGET_WAITKIND_EXITED:
|
||
case TARGET_WAITKIND_SIGNALLED:
|
||
{
|
||
/* Depending on the system, ecs->ptid may point to a thread or
|
||
to a process. On some targets, target_mourn_inferior may
|
||
need to have access to the just-exited thread. That is the
|
||
case of GNU/Linux's "checkpoint" support, for example.
|
||
Call the switch_to_xxx routine as appropriate. */
|
||
thread_info *thr = find_thread_ptid (ecs->target, ecs->ptid);
|
||
if (thr != nullptr)
|
||
switch_to_thread (thr);
|
||
else
|
||
{
|
||
inferior *inf = find_inferior_ptid (ecs->target, ecs->ptid);
|
||
switch_to_inferior_no_thread (inf);
|
||
}
|
||
}
|
||
handle_vfork_child_exec_or_exit (0);
|
||
target_terminal::ours (); /* Must do this before mourn anyway. */
|
||
|
||
/* Clearing any previous state of convenience variables. */
|
||
clear_exit_convenience_vars ();
|
||
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_EXITED)
|
||
{
|
||
/* Record the exit code in the convenience variable $_exitcode, so
|
||
that the user can inspect this again later. */
|
||
set_internalvar_integer (lookup_internalvar ("_exitcode"),
|
||
(LONGEST) ecs->ws.exit_status ());
|
||
|
||
/* Also record this in the inferior itself. */
|
||
current_inferior ()->has_exit_code = 1;
|
||
current_inferior ()->exit_code = (LONGEST) ecs->ws.exit_status ();
|
||
|
||
/* Support the --return-child-result option. */
|
||
return_child_result_value = ecs->ws.exit_status ();
|
||
|
||
gdb::observers::exited.notify (ecs->ws.exit_status ());
|
||
}
|
||
else
|
||
{
|
||
struct gdbarch *gdbarch = current_inferior ()->gdbarch;
|
||
|
||
if (gdbarch_gdb_signal_to_target_p (gdbarch))
|
||
{
|
||
/* Set the value of the internal variable $_exitsignal,
|
||
which holds the signal uncaught by the inferior. */
|
||
set_internalvar_integer (lookup_internalvar ("_exitsignal"),
|
||
gdbarch_gdb_signal_to_target (gdbarch,
|
||
ecs->ws.sig ()));
|
||
}
|
||
else
|
||
{
|
||
/* We don't have access to the target's method used for
|
||
converting between signal numbers (GDB's internal
|
||
representation <-> target's representation).
|
||
Therefore, we cannot do a good job at displaying this
|
||
information to the user. It's better to just warn
|
||
her about it (if infrun debugging is enabled), and
|
||
give up. */
|
||
infrun_debug_printf ("Cannot fill $_exitsignal with the correct "
|
||
"signal number.");
|
||
}
|
||
|
||
gdb::observers::signal_exited.notify (ecs->ws.sig ());
|
||
}
|
||
|
||
gdb_flush (gdb_stdout);
|
||
target_mourn_inferior (inferior_ptid);
|
||
stop_print_frame = false;
|
||
stop_waiting (ecs);
|
||
return;
|
||
|
||
case TARGET_WAITKIND_FORKED:
|
||
case TARGET_WAITKIND_VFORKED:
|
||
/* Check whether the inferior is displaced stepping. */
|
||
{
|
||
struct regcache *regcache = get_thread_regcache (ecs->event_thread);
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
inferior *parent_inf = find_inferior_ptid (ecs->target, ecs->ptid);
|
||
|
||
/* If this is a fork (child gets its own address space copy)
|
||
and some displaced step buffers were in use at the time of
|
||
the fork, restore the displaced step buffer bytes in the
|
||
child process.
|
||
|
||
Architectures which support displaced stepping and fork
|
||
events must supply an implementation of
|
||
gdbarch_displaced_step_restore_all_in_ptid. This is not
|
||
enforced during gdbarch validation to support architectures
|
||
which support displaced stepping but not forks. */
|
||
if (ecs->ws.kind () == TARGET_WAITKIND_FORKED
|
||
&& gdbarch_supports_displaced_stepping (gdbarch))
|
||
gdbarch_displaced_step_restore_all_in_ptid
|
||
(gdbarch, parent_inf, ecs->ws.child_ptid ());
|
||
|
||
/* If displaced stepping is supported, and thread ecs->ptid is
|
||
displaced stepping. */
|
||
if (displaced_step_in_progress_thread (ecs->event_thread))
|
||
{
|
||
struct regcache *child_regcache;
|
||
CORE_ADDR parent_pc;
|
||
|
||
/* GDB has got TARGET_WAITKIND_FORKED or TARGET_WAITKIND_VFORKED,
|
||
indicating that the displaced stepping of syscall instruction
|
||
has been done. Perform cleanup for parent process here. Note
|
||
that this operation also cleans up the child process for vfork,
|
||
because their pages are shared. */
|
||
displaced_step_finish (ecs->event_thread, GDB_SIGNAL_TRAP);
|
||
/* Start a new step-over in another thread if there's one
|
||
that needs it. */
|
||
start_step_over ();
|
||
|
||
/* Since the vfork/fork syscall instruction was executed in the scratchpad,
|
||
the child's PC is also within the scratchpad. Set the child's PC
|
||
to the parent's PC value, which has already been fixed up.
|
||
FIXME: we use the parent's aspace here, although we're touching
|
||
the child, because the child hasn't been added to the inferior
|
||
list yet at this point. */
|
||
|
||
child_regcache
|
||
= get_thread_arch_aspace_regcache (parent_inf->process_target (),
|
||
ecs->ws.child_ptid (),
|
||
gdbarch,
|
||
parent_inf->aspace);
|
||
/* Read PC value of parent process. */
|
||
parent_pc = regcache_read_pc (regcache);
|
||
|
||
displaced_debug_printf ("write child pc from %s to %s",
|
||
paddress (gdbarch,
|
||
regcache_read_pc (child_regcache)),
|
||
paddress (gdbarch, parent_pc));
|
||
|
||
regcache_write_pc (child_regcache, parent_pc);
|
||
}
|
||
}
|
||
|
||
context_switch (ecs);
|
||
|
||
/* Immediately detach breakpoints from the child before there's
|
||
any chance of letting the user delete breakpoints from the
|
||
breakpoint lists. If we don't do this early, it's easy to
|
||
leave left over traps in the child, vis: "break foo; catch
|
||
fork; c; <fork>; del; c; <child calls foo>". We only follow
|
||
the fork on the last `continue', and by that time the
|
||
breakpoint at "foo" is long gone from the breakpoint table.
|
||
If we vforked, then we don't need to unpatch here, since both
|
||
parent and child are sharing the same memory pages; we'll
|
||
need to unpatch at follow/detach time instead to be certain
|
||
that new breakpoints added between catchpoint hit time and
|
||
vfork follow are detached. */
|
||
if (ecs->ws.kind () != TARGET_WAITKIND_VFORKED)
|
||
{
|
||
/* This won't actually modify the breakpoint list, but will
|
||
physically remove the breakpoints from the child. */
|
||
detach_breakpoints (ecs->ws.child_ptid ());
|
||
}
|
||
|
||
delete_just_stopped_threads_single_step_breakpoints ();
|
||
|
||
/* In case the event is caught by a catchpoint, remember that
|
||
the event is to be followed at the next resume of the thread,
|
||
and not immediately. */
|
||
ecs->event_thread->pending_follow = ecs->ws;
|
||
|
||
ecs->event_thread->set_stop_pc
|
||
(regcache_read_pc (get_thread_regcache (ecs->event_thread)));
|
||
|
||
ecs->event_thread->control.stop_bpstat
|
||
= bpstat_stop_status_nowatch (get_current_regcache ()->aspace (),
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->event_thread, ecs->ws);
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
|
||
/* If no catchpoint triggered for this, then keep going. Note
|
||
that we're interested in knowing the bpstat actually causes a
|
||
stop, not just if it may explain the signal. Software
|
||
watchpoints, for example, always appear in the bpstat. */
|
||
if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
|
||
{
|
||
bool follow_child
|
||
= (follow_fork_mode_string == follow_fork_mode_child);
|
||
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
process_stratum_target *targ
|
||
= ecs->event_thread->inf->process_target ();
|
||
|
||
bool should_resume = follow_fork ();
|
||
|
||
/* Note that one of these may be an invalid pointer,
|
||
depending on detach_fork. */
|
||
thread_info *parent = ecs->event_thread;
|
||
thread_info *child = find_thread_ptid (targ, ecs->ws.child_ptid ());
|
||
|
||
/* At this point, the parent is marked running, and the
|
||
child is marked stopped. */
|
||
|
||
/* If not resuming the parent, mark it stopped. */
|
||
if (follow_child && !detach_fork && !non_stop && !sched_multi)
|
||
parent->set_running (false);
|
||
|
||
/* If resuming the child, mark it running. */
|
||
if (follow_child || (!detach_fork && (non_stop || sched_multi)))
|
||
child->set_running (true);
|
||
|
||
/* In non-stop mode, also resume the other branch. */
|
||
if (!detach_fork && (non_stop
|
||
|| (sched_multi && target_is_non_stop_p ())))
|
||
{
|
||
if (follow_child)
|
||
switch_to_thread (parent);
|
||
else
|
||
switch_to_thread (child);
|
||
|
||
ecs->event_thread = inferior_thread ();
|
||
ecs->ptid = inferior_ptid;
|
||
keep_going (ecs);
|
||
}
|
||
|
||
if (follow_child)
|
||
switch_to_thread (child);
|
||
else
|
||
switch_to_thread (parent);
|
||
|
||
ecs->event_thread = inferior_thread ();
|
||
ecs->ptid = inferior_ptid;
|
||
|
||
if (should_resume)
|
||
{
|
||
/* Never call switch_back_to_stepped_thread if we are waiting for
|
||
vfork-done (waiting for an external vfork child to exec or
|
||
exit). We will resume only the vforking thread for the purpose
|
||
of collecting the vfork-done event, and we will restart any
|
||
step once the critical shared address space window is done. */
|
||
if ((!follow_child
|
||
&& detach_fork
|
||
&& parent->inf->thread_waiting_for_vfork_done != nullptr)
|
||
|| !switch_back_to_stepped_thread (ecs))
|
||
keep_going (ecs);
|
||
}
|
||
else
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
process_event_stop_test (ecs);
|
||
return;
|
||
|
||
case TARGET_WAITKIND_VFORK_DONE:
|
||
/* Done with the shared memory region. Re-insert breakpoints in
|
||
the parent, and keep going. */
|
||
|
||
context_switch (ecs);
|
||
|
||
handle_vfork_done (ecs->event_thread);
|
||
gdb_assert (inferior_thread () == ecs->event_thread);
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
|
||
if (!switch_back_to_stepped_thread (ecs))
|
||
{
|
||
gdb_assert (inferior_thread () == ecs->event_thread);
|
||
/* This also takes care of reinserting breakpoints in the
|
||
previously locked inferior. */
|
||
keep_going (ecs);
|
||
}
|
||
return;
|
||
|
||
case TARGET_WAITKIND_EXECD:
|
||
|
||
/* Note we can't read registers yet (the stop_pc), because we
|
||
don't yet know the inferior's post-exec architecture.
|
||
'stop_pc' is explicitly read below instead. */
|
||
switch_to_thread_no_regs (ecs->event_thread);
|
||
|
||
/* Do whatever is necessary to the parent branch of the vfork. */
|
||
handle_vfork_child_exec_or_exit (1);
|
||
|
||
/* This causes the eventpoints and symbol table to be reset.
|
||
Must do this now, before trying to determine whether to
|
||
stop. */
|
||
follow_exec (inferior_ptid, ecs->ws.execd_pathname ());
|
||
|
||
/* In follow_exec we may have deleted the original thread and
|
||
created a new one. Make sure that the event thread is the
|
||
execd thread for that case (this is a nop otherwise). */
|
||
ecs->event_thread = inferior_thread ();
|
||
|
||
ecs->event_thread->set_stop_pc
|
||
(regcache_read_pc (get_thread_regcache (ecs->event_thread)));
|
||
|
||
ecs->event_thread->control.stop_bpstat
|
||
= bpstat_stop_status_nowatch (get_current_regcache ()->aspace (),
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->event_thread, ecs->ws);
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
|
||
/* If no catchpoint triggered for this, then keep going. */
|
||
if (!bpstat_causes_stop (ecs->event_thread->control.stop_bpstat))
|
||
{
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
process_event_stop_test (ecs);
|
||
return;
|
||
|
||
/* Be careful not to try to gather much state about a thread
|
||
that's in a syscall. It's frequently a losing proposition. */
|
||
case TARGET_WAITKIND_SYSCALL_ENTRY:
|
||
/* Getting the current syscall number. */
|
||
if (handle_syscall_event (ecs) == 0)
|
||
process_event_stop_test (ecs);
|
||
return;
|
||
|
||
/* Before examining the threads further, step this thread to
|
||
get it entirely out of the syscall. (We get notice of the
|
||
event when the thread is just on the verge of exiting a
|
||
syscall. Stepping one instruction seems to get it back
|
||
into user code.) */
|
||
case TARGET_WAITKIND_SYSCALL_RETURN:
|
||
if (handle_syscall_event (ecs) == 0)
|
||
process_event_stop_test (ecs);
|
||
return;
|
||
|
||
case TARGET_WAITKIND_STOPPED:
|
||
handle_signal_stop (ecs);
|
||
return;
|
||
|
||
case TARGET_WAITKIND_NO_HISTORY:
|
||
/* Reverse execution: target ran out of history info. */
|
||
|
||
/* Switch to the stopped thread. */
|
||
context_switch (ecs);
|
||
infrun_debug_printf ("stopped");
|
||
|
||
delete_just_stopped_threads_single_step_breakpoints ();
|
||
ecs->event_thread->set_stop_pc
|
||
(regcache_read_pc (get_thread_regcache (inferior_thread ())));
|
||
|
||
if (handle_stop_requested (ecs))
|
||
return;
|
||
|
||
gdb::observers::no_history.notify ();
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Restart threads back to what they were trying to do back when we
|
||
paused them (because of an in-line step-over or vfork, for example).
|
||
The EVENT_THREAD thread is ignored (not restarted).
|
||
|
||
If INF is non-nullptr, only resume threads from INF. */
|
||
|
||
static void
|
||
restart_threads (struct thread_info *event_thread, inferior *inf)
|
||
{
|
||
INFRUN_SCOPED_DEBUG_START_END ("event_thread=%s, inf=%d",
|
||
event_thread->ptid.to_string ().c_str (),
|
||
inf != nullptr ? inf->num : -1);
|
||
|
||
/* In case the instruction just stepped spawned a new thread. */
|
||
update_thread_list ();
|
||
|
||
for (thread_info *tp : all_non_exited_threads ())
|
||
{
|
||
if (inf != nullptr && tp->inf != inf)
|
||
continue;
|
||
|
||
if (tp->inf->detaching)
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] inferior detaching",
|
||
tp->ptid.to_string ().c_str ());
|
||
continue;
|
||
}
|
||
|
||
switch_to_thread_no_regs (tp);
|
||
|
||
if (tp == event_thread)
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] is event thread",
|
||
tp->ptid.to_string ().c_str ());
|
||
continue;
|
||
}
|
||
|
||
if (!(tp->state == THREAD_RUNNING || tp->control.in_infcall))
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] not meant to be running",
|
||
tp->ptid.to_string ().c_str ());
|
||
continue;
|
||
}
|
||
|
||
if (tp->resumed ())
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] resumed",
|
||
tp->ptid.to_string ().c_str ());
|
||
gdb_assert (tp->executing () || tp->has_pending_waitstatus ());
|
||
continue;
|
||
}
|
||
|
||
if (thread_is_in_step_over_chain (tp))
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] needs step-over",
|
||
tp->ptid.to_string ().c_str ());
|
||
gdb_assert (!tp->resumed ());
|
||
continue;
|
||
}
|
||
|
||
|
||
if (tp->has_pending_waitstatus ())
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] has pending status",
|
||
tp->ptid.to_string ().c_str ());
|
||
tp->set_resumed (true);
|
||
continue;
|
||
}
|
||
|
||
gdb_assert (!tp->stop_requested);
|
||
|
||
/* If some thread needs to start a step-over at this point, it
|
||
should still be in the step-over queue, and thus skipped
|
||
above. */
|
||
if (thread_still_needs_step_over (tp))
|
||
{
|
||
internal_error (__FILE__, __LINE__,
|
||
"thread [%s] needs a step-over, but not in "
|
||
"step-over queue\n",
|
||
tp->ptid.to_string ().c_str ());
|
||
}
|
||
|
||
if (currently_stepping (tp))
|
||
{
|
||
infrun_debug_printf ("restart threads: [%s] was stepping",
|
||
tp->ptid.to_string ().c_str ());
|
||
keep_going_stepped_thread (tp);
|
||
}
|
||
else
|
||
{
|
||
struct execution_control_state ecss;
|
||
struct execution_control_state *ecs = &ecss;
|
||
|
||
infrun_debug_printf ("restart threads: [%s] continuing",
|
||
tp->ptid.to_string ().c_str ());
|
||
reset_ecs (ecs, tp);
|
||
switch_to_thread (tp);
|
||
keep_going_pass_signal (ecs);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Callback for iterate_over_threads. Find a resumed thread that has
|
||
a pending waitstatus. */
|
||
|
||
static int
|
||
resumed_thread_with_pending_status (struct thread_info *tp,
|
||
void *arg)
|
||
{
|
||
return tp->resumed () && tp->has_pending_waitstatus ();
|
||
}
|
||
|
||
/* Called when we get an event that may finish an in-line or
|
||
out-of-line (displaced stepping) step-over started previously.
|
||
Return true if the event is processed and we should go back to the
|
||
event loop; false if the caller should continue processing the
|
||
event. */
|
||
|
||
static int
|
||
finish_step_over (struct execution_control_state *ecs)
|
||
{
|
||
displaced_step_finish (ecs->event_thread, ecs->event_thread->stop_signal ());
|
||
|
||
bool had_step_over_info = step_over_info_valid_p ();
|
||
|
||
if (had_step_over_info)
|
||
{
|
||
/* If we're stepping over a breakpoint with all threads locked,
|
||
then only the thread that was stepped should be reporting
|
||
back an event. */
|
||
gdb_assert (ecs->event_thread->control.trap_expected);
|
||
|
||
clear_step_over_info ();
|
||
}
|
||
|
||
if (!target_is_non_stop_p ())
|
||
return 0;
|
||
|
||
/* Start a new step-over in another thread if there's one that
|
||
needs it. */
|
||
start_step_over ();
|
||
|
||
/* If we were stepping over a breakpoint before, and haven't started
|
||
a new in-line step-over sequence, then restart all other threads
|
||
(except the event thread). We can't do this in all-stop, as then
|
||
e.g., we wouldn't be able to issue any other remote packet until
|
||
these other threads stop. */
|
||
if (had_step_over_info && !step_over_info_valid_p ())
|
||
{
|
||
struct thread_info *pending;
|
||
|
||
/* If we only have threads with pending statuses, the restart
|
||
below won't restart any thread and so nothing re-inserts the
|
||
breakpoint we just stepped over. But we need it inserted
|
||
when we later process the pending events, otherwise if
|
||
another thread has a pending event for this breakpoint too,
|
||
we'd discard its event (because the breakpoint that
|
||
originally caused the event was no longer inserted). */
|
||
context_switch (ecs);
|
||
insert_breakpoints ();
|
||
|
||
restart_threads (ecs->event_thread);
|
||
|
||
/* If we have events pending, go through handle_inferior_event
|
||
again, picking up a pending event at random. This avoids
|
||
thread starvation. */
|
||
|
||
/* But not if we just stepped over a watchpoint in order to let
|
||
the instruction execute so we can evaluate its expression.
|
||
The set of watchpoints that triggered is recorded in the
|
||
breakpoint objects themselves (see bp->watchpoint_triggered).
|
||
If we processed another event first, that other event could
|
||
clobber this info. */
|
||
if (ecs->event_thread->stepping_over_watchpoint)
|
||
return 0;
|
||
|
||
pending = iterate_over_threads (resumed_thread_with_pending_status,
|
||
NULL);
|
||
if (pending != NULL)
|
||
{
|
||
struct thread_info *tp = ecs->event_thread;
|
||
struct regcache *regcache;
|
||
|
||
infrun_debug_printf ("found resumed threads with "
|
||
"pending events, saving status");
|
||
|
||
gdb_assert (pending != tp);
|
||
|
||
/* Record the event thread's event for later. */
|
||
save_waitstatus (tp, ecs->ws);
|
||
/* This was cleared early, by handle_inferior_event. Set it
|
||
so this pending event is considered by
|
||
do_target_wait. */
|
||
tp->set_resumed (true);
|
||
|
||
gdb_assert (!tp->executing ());
|
||
|
||
regcache = get_thread_regcache (tp);
|
||
tp->set_stop_pc (regcache_read_pc (regcache));
|
||
|
||
infrun_debug_printf ("saved stop_pc=%s for %s "
|
||
"(currently_stepping=%d)",
|
||
paddress (target_gdbarch (), tp->stop_pc ()),
|
||
tp->ptid.to_string ().c_str (),
|
||
currently_stepping (tp));
|
||
|
||
/* This in-line step-over finished; clear this so we won't
|
||
start a new one. This is what handle_signal_stop would
|
||
do, if we returned false. */
|
||
tp->stepping_over_breakpoint = 0;
|
||
|
||
/* Wake up the event loop again. */
|
||
mark_async_event_handler (infrun_async_inferior_event_token);
|
||
|
||
prepare_to_wait (ecs);
|
||
return 1;
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Come here when the program has stopped with a signal. */
|
||
|
||
static void
|
||
handle_signal_stop (struct execution_control_state *ecs)
|
||
{
|
||
struct frame_info *frame;
|
||
struct gdbarch *gdbarch;
|
||
int stopped_by_watchpoint;
|
||
enum stop_kind stop_soon;
|
||
int random_signal;
|
||
|
||
gdb_assert (ecs->ws.kind () == TARGET_WAITKIND_STOPPED);
|
||
|
||
ecs->event_thread->set_stop_signal (ecs->ws.sig ());
|
||
|
||
/* Do we need to clean up the state of a thread that has
|
||
completed a displaced single-step? (Doing so usually affects
|
||
the PC, so do it here, before we set stop_pc.) */
|
||
if (finish_step_over (ecs))
|
||
return;
|
||
|
||
/* If we either finished a single-step or hit a breakpoint, but
|
||
the user wanted this thread to be stopped, pretend we got a
|
||
SIG0 (generic unsignaled stop). */
|
||
if (ecs->event_thread->stop_requested
|
||
&& ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP)
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
ecs->event_thread->set_stop_pc
|
||
(regcache_read_pc (get_thread_regcache (ecs->event_thread)));
|
||
|
||
context_switch (ecs);
|
||
|
||
if (deprecated_context_hook)
|
||
deprecated_context_hook (ecs->event_thread->global_num);
|
||
|
||
if (debug_infrun)
|
||
{
|
||
struct regcache *regcache = get_thread_regcache (ecs->event_thread);
|
||
struct gdbarch *reg_gdbarch = regcache->arch ();
|
||
|
||
infrun_debug_printf
|
||
("stop_pc=%s", paddress (reg_gdbarch, ecs->event_thread->stop_pc ()));
|
||
if (target_stopped_by_watchpoint ())
|
||
{
|
||
CORE_ADDR addr;
|
||
|
||
infrun_debug_printf ("stopped by watchpoint");
|
||
|
||
if (target_stopped_data_address (current_inferior ()->top_target (),
|
||
&addr))
|
||
infrun_debug_printf ("stopped data address=%s",
|
||
paddress (reg_gdbarch, addr));
|
||
else
|
||
infrun_debug_printf ("(no data address available)");
|
||
}
|
||
}
|
||
|
||
/* This is originated from start_remote(), start_inferior() and
|
||
shared libraries hook functions. */
|
||
stop_soon = get_inferior_stop_soon (ecs);
|
||
if (stop_soon == STOP_QUIETLY || stop_soon == STOP_QUIETLY_REMOTE)
|
||
{
|
||
infrun_debug_printf ("quietly stopped");
|
||
stop_print_frame = true;
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
|
||
/* This originates from attach_command(). We need to overwrite
|
||
the stop_signal here, because some kernels don't ignore a
|
||
SIGSTOP in a subsequent ptrace(PTRACE_CONT,SIGSTOP) call.
|
||
See more comments in inferior.h. On the other hand, if we
|
||
get a non-SIGSTOP, report it to the user - assume the backend
|
||
will handle the SIGSTOP if it should show up later.
|
||
|
||
Also consider that the attach is complete when we see a
|
||
SIGTRAP. Some systems (e.g. Windows), and stubs supporting
|
||
target extended-remote report it instead of a SIGSTOP
|
||
(e.g. gdbserver). We already rely on SIGTRAP being our
|
||
signal, so this is no exception.
|
||
|
||
Also consider that the attach is complete when we see a
|
||
GDB_SIGNAL_0. In non-stop mode, GDB will explicitly tell
|
||
the target to stop all threads of the inferior, in case the
|
||
low level attach operation doesn't stop them implicitly. If
|
||
they weren't stopped implicitly, then the stub will report a
|
||
GDB_SIGNAL_0, meaning: stopped for no particular reason
|
||
other than GDB's request. */
|
||
if (stop_soon == STOP_QUIETLY_NO_SIGSTOP
|
||
&& (ecs->event_thread->stop_signal () == GDB_SIGNAL_STOP
|
||
|| ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP
|
||
|| ecs->event_thread->stop_signal () == GDB_SIGNAL_0))
|
||
{
|
||
stop_print_frame = true;
|
||
stop_waiting (ecs);
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
return;
|
||
}
|
||
|
||
/* At this point, get hold of the now-current thread's frame. */
|
||
frame = get_current_frame ();
|
||
gdbarch = get_frame_arch (frame);
|
||
|
||
/* Pull the single step breakpoints out of the target. */
|
||
if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP)
|
||
{
|
||
struct regcache *regcache;
|
||
CORE_ADDR pc;
|
||
|
||
regcache = get_thread_regcache (ecs->event_thread);
|
||
const address_space *aspace = regcache->aspace ();
|
||
|
||
pc = regcache_read_pc (regcache);
|
||
|
||
/* However, before doing so, if this single-step breakpoint was
|
||
actually for another thread, set this thread up for moving
|
||
past it. */
|
||
if (!thread_has_single_step_breakpoint_here (ecs->event_thread,
|
||
aspace, pc))
|
||
{
|
||
if (single_step_breakpoint_inserted_here_p (aspace, pc))
|
||
{
|
||
infrun_debug_printf ("[%s] hit another thread's single-step "
|
||
"breakpoint",
|
||
ecs->ptid.to_string ().c_str ());
|
||
ecs->hit_singlestep_breakpoint = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf ("[%s] hit its single-step breakpoint",
|
||
ecs->ptid.to_string ().c_str ());
|
||
}
|
||
}
|
||
delete_just_stopped_threads_single_step_breakpoints ();
|
||
|
||
if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP
|
||
&& ecs->event_thread->control.trap_expected
|
||
&& ecs->event_thread->stepping_over_watchpoint)
|
||
stopped_by_watchpoint = 0;
|
||
else
|
||
stopped_by_watchpoint = watchpoints_triggered (ecs->ws);
|
||
|
||
/* If necessary, step over this watchpoint. We'll be back to display
|
||
it in a moment. */
|
||
if (stopped_by_watchpoint
|
||
&& (target_have_steppable_watchpoint ()
|
||
|| gdbarch_have_nonsteppable_watchpoint (gdbarch)))
|
||
{
|
||
/* At this point, we are stopped at an instruction which has
|
||
attempted to write to a piece of memory under control of
|
||
a watchpoint. The instruction hasn't actually executed
|
||
yet. If we were to evaluate the watchpoint expression
|
||
now, we would get the old value, and therefore no change
|
||
would seem to have occurred.
|
||
|
||
In order to make watchpoints work `right', we really need
|
||
to complete the memory write, and then evaluate the
|
||
watchpoint expression. We do this by single-stepping the
|
||
target.
|
||
|
||
It may not be necessary to disable the watchpoint to step over
|
||
it. For example, the PA can (with some kernel cooperation)
|
||
single step over a watchpoint without disabling the watchpoint.
|
||
|
||
It is far more common to need to disable a watchpoint to step
|
||
the inferior over it. If we have non-steppable watchpoints,
|
||
we must disable the current watchpoint; it's simplest to
|
||
disable all watchpoints.
|
||
|
||
Any breakpoint at PC must also be stepped over -- if there's
|
||
one, it will have already triggered before the watchpoint
|
||
triggered, and we either already reported it to the user, or
|
||
it didn't cause a stop and we called keep_going. In either
|
||
case, if there was a breakpoint at PC, we must be trying to
|
||
step past it. */
|
||
ecs->event_thread->stepping_over_watchpoint = 1;
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
ecs->event_thread->stepping_over_breakpoint = 0;
|
||
ecs->event_thread->stepping_over_watchpoint = 0;
|
||
bpstat_clear (&ecs->event_thread->control.stop_bpstat);
|
||
ecs->event_thread->control.stop_step = 0;
|
||
stop_print_frame = true;
|
||
stopped_by_random_signal = 0;
|
||
bpstat *stop_chain = nullptr;
|
||
|
||
/* Hide inlined functions starting here, unless we just performed stepi or
|
||
nexti. After stepi and nexti, always show the innermost frame (not any
|
||
inline function call sites). */
|
||
if (ecs->event_thread->control.step_range_end != 1)
|
||
{
|
||
const address_space *aspace
|
||
= get_thread_regcache (ecs->event_thread)->aspace ();
|
||
|
||
/* skip_inline_frames is expensive, so we avoid it if we can
|
||
determine that the address is one where functions cannot have
|
||
been inlined. This improves performance with inferiors that
|
||
load a lot of shared libraries, because the solib event
|
||
breakpoint is defined as the address of a function (i.e. not
|
||
inline). Note that we have to check the previous PC as well
|
||
as the current one to catch cases when we have just
|
||
single-stepped off a breakpoint prior to reinstating it.
|
||
Note that we're assuming that the code we single-step to is
|
||
not inline, but that's not definitive: there's nothing
|
||
preventing the event breakpoint function from containing
|
||
inlined code, and the single-step ending up there. If the
|
||
user had set a breakpoint on that inlined code, the missing
|
||
skip_inline_frames call would break things. Fortunately
|
||
that's an extremely unlikely scenario. */
|
||
if (!pc_at_non_inline_function (aspace,
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->ws)
|
||
&& !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP
|
||
&& ecs->event_thread->control.trap_expected
|
||
&& pc_at_non_inline_function (aspace,
|
||
ecs->event_thread->prev_pc,
|
||
ecs->ws)))
|
||
{
|
||
stop_chain = build_bpstat_chain (aspace,
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->ws);
|
||
skip_inline_frames (ecs->event_thread, stop_chain);
|
||
|
||
/* Re-fetch current thread's frame in case that invalidated
|
||
the frame cache. */
|
||
frame = get_current_frame ();
|
||
gdbarch = get_frame_arch (frame);
|
||
}
|
||
}
|
||
|
||
if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP
|
||
&& ecs->event_thread->control.trap_expected
|
||
&& gdbarch_single_step_through_delay_p (gdbarch)
|
||
&& currently_stepping (ecs->event_thread))
|
||
{
|
||
/* We're trying to step off a breakpoint. Turns out that we're
|
||
also on an instruction that needs to be stepped multiple
|
||
times before it's been fully executing. E.g., architectures
|
||
with a delay slot. It needs to be stepped twice, once for
|
||
the instruction and once for the delay slot. */
|
||
int step_through_delay
|
||
= gdbarch_single_step_through_delay (gdbarch, frame);
|
||
|
||
if (step_through_delay)
|
||
infrun_debug_printf ("step through delay");
|
||
|
||
if (ecs->event_thread->control.step_range_end == 0
|
||
&& step_through_delay)
|
||
{
|
||
/* The user issued a continue when stopped at a breakpoint.
|
||
Set up for another trap and get out of here. */
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
else if (step_through_delay)
|
||
{
|
||
/* The user issued a step when stopped at a breakpoint.
|
||
Maybe we should stop, maybe we should not - the delay
|
||
slot *might* correspond to a line of source. In any
|
||
case, don't decide that here, just set
|
||
ecs->stepping_over_breakpoint, making sure we
|
||
single-step again before breakpoints are re-inserted. */
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
}
|
||
}
|
||
|
||
/* See if there is a breakpoint/watchpoint/catchpoint/etc. that
|
||
handles this event. */
|
||
ecs->event_thread->control.stop_bpstat
|
||
= bpstat_stop_status (get_current_regcache ()->aspace (),
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->event_thread, ecs->ws, stop_chain);
|
||
|
||
/* Following in case break condition called a
|
||
function. */
|
||
stop_print_frame = true;
|
||
|
||
/* This is where we handle "moribund" watchpoints. Unlike
|
||
software breakpoints traps, hardware watchpoint traps are
|
||
always distinguishable from random traps. If no high-level
|
||
watchpoint is associated with the reported stop data address
|
||
anymore, then the bpstat does not explain the signal ---
|
||
simply make sure to ignore it if `stopped_by_watchpoint' is
|
||
set. */
|
||
|
||
if (ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP
|
||
&& !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
|
||
GDB_SIGNAL_TRAP)
|
||
&& stopped_by_watchpoint)
|
||
{
|
||
infrun_debug_printf ("no user watchpoint explains watchpoint SIGTRAP, "
|
||
"ignoring");
|
||
}
|
||
|
||
/* NOTE: cagney/2003-03-29: These checks for a random signal
|
||
at one stage in the past included checks for an inferior
|
||
function call's call dummy's return breakpoint. The original
|
||
comment, that went with the test, read:
|
||
|
||
``End of a stack dummy. Some systems (e.g. Sony news) give
|
||
another signal besides SIGTRAP, so check here as well as
|
||
above.''
|
||
|
||
If someone ever tries to get call dummys on a
|
||
non-executable stack to work (where the target would stop
|
||
with something like a SIGSEGV), then those tests might need
|
||
to be re-instated. Given, however, that the tests were only
|
||
enabled when momentary breakpoints were not being used, I
|
||
suspect that it won't be the case.
|
||
|
||
NOTE: kettenis/2004-02-05: Indeed such checks don't seem to
|
||
be necessary for call dummies on a non-executable stack on
|
||
SPARC. */
|
||
|
||
/* See if the breakpoints module can explain the signal. */
|
||
random_signal
|
||
= !bpstat_explains_signal (ecs->event_thread->control.stop_bpstat,
|
||
ecs->event_thread->stop_signal ());
|
||
|
||
/* Maybe this was a trap for a software breakpoint that has since
|
||
been removed. */
|
||
if (random_signal && target_stopped_by_sw_breakpoint ())
|
||
{
|
||
if (gdbarch_program_breakpoint_here_p (gdbarch,
|
||
ecs->event_thread->stop_pc ()))
|
||
{
|
||
struct regcache *regcache;
|
||
int decr_pc;
|
||
|
||
/* Re-adjust PC to what the program would see if GDB was not
|
||
debugging it. */
|
||
regcache = get_thread_regcache (ecs->event_thread);
|
||
decr_pc = gdbarch_decr_pc_after_break (gdbarch);
|
||
if (decr_pc != 0)
|
||
{
|
||
gdb::optional<scoped_restore_tmpl<int>>
|
||
restore_operation_disable;
|
||
|
||
if (record_full_is_used ())
|
||
restore_operation_disable.emplace
|
||
(record_full_gdb_operation_disable_set ());
|
||
|
||
regcache_write_pc (regcache,
|
||
ecs->event_thread->stop_pc () + decr_pc);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* A delayed software breakpoint event. Ignore the trap. */
|
||
infrun_debug_printf ("delayed software breakpoint trap, ignoring");
|
||
random_signal = 0;
|
||
}
|
||
}
|
||
|
||
/* Maybe this was a trap for a hardware breakpoint/watchpoint that
|
||
has since been removed. */
|
||
if (random_signal && target_stopped_by_hw_breakpoint ())
|
||
{
|
||
/* A delayed hardware breakpoint event. Ignore the trap. */
|
||
infrun_debug_printf ("delayed hardware breakpoint/watchpoint "
|
||
"trap, ignoring");
|
||
random_signal = 0;
|
||
}
|
||
|
||
/* If not, perhaps stepping/nexting can. */
|
||
if (random_signal)
|
||
random_signal = !(ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP
|
||
&& currently_stepping (ecs->event_thread));
|
||
|
||
/* Perhaps the thread hit a single-step breakpoint of _another_
|
||
thread. Single-step breakpoints are transparent to the
|
||
breakpoints module. */
|
||
if (random_signal)
|
||
random_signal = !ecs->hit_singlestep_breakpoint;
|
||
|
||
/* No? Perhaps we got a moribund watchpoint. */
|
||
if (random_signal)
|
||
random_signal = !stopped_by_watchpoint;
|
||
|
||
/* Always stop if the user explicitly requested this thread to
|
||
remain stopped. */
|
||
if (ecs->event_thread->stop_requested)
|
||
{
|
||
random_signal = 1;
|
||
infrun_debug_printf ("user-requested stop");
|
||
}
|
||
|
||
/* For the program's own signals, act according to
|
||
the signal handling tables. */
|
||
|
||
if (random_signal)
|
||
{
|
||
/* Signal not for debugging purposes. */
|
||
enum gdb_signal stop_signal = ecs->event_thread->stop_signal ();
|
||
|
||
infrun_debug_printf ("random signal (%s)",
|
||
gdb_signal_to_symbol_string (stop_signal));
|
||
|
||
stopped_by_random_signal = 1;
|
||
|
||
/* Always stop on signals if we're either just gaining control
|
||
of the program, or the user explicitly requested this thread
|
||
to remain stopped. */
|
||
if (stop_soon != NO_STOP_QUIETLY
|
||
|| ecs->event_thread->stop_requested
|
||
|| signal_stop_state (ecs->event_thread->stop_signal ()))
|
||
{
|
||
stop_waiting (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Notify observers the signal has "handle print" set. Note we
|
||
returned early above if stopping; normal_stop handles the
|
||
printing in that case. */
|
||
if (signal_print[ecs->event_thread->stop_signal ()])
|
||
{
|
||
/* The signal table tells us to print about this signal. */
|
||
target_terminal::ours_for_output ();
|
||
gdb::observers::signal_received.notify (ecs->event_thread->stop_signal ());
|
||
target_terminal::inferior ();
|
||
}
|
||
|
||
/* Clear the signal if it should not be passed. */
|
||
if (signal_program[ecs->event_thread->stop_signal ()] == 0)
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
if (ecs->event_thread->prev_pc == ecs->event_thread->stop_pc ()
|
||
&& ecs->event_thread->control.trap_expected
|
||
&& ecs->event_thread->control.step_resume_breakpoint == NULL)
|
||
{
|
||
/* We were just starting a new sequence, attempting to
|
||
single-step off of a breakpoint and expecting a SIGTRAP.
|
||
Instead this signal arrives. This signal will take us out
|
||
of the stepping range so GDB needs to remember to, when
|
||
the signal handler returns, resume stepping off that
|
||
breakpoint. */
|
||
/* To simplify things, "continue" is forced to use the same
|
||
code paths as single-step - set a breakpoint at the
|
||
signal return address and then, once hit, step off that
|
||
breakpoint. */
|
||
infrun_debug_printf ("signal arrived while stepping over breakpoint");
|
||
|
||
insert_hp_step_resume_breakpoint_at_frame (frame);
|
||
ecs->event_thread->step_after_step_resume_breakpoint = 1;
|
||
/* Reset trap_expected to ensure breakpoints are re-inserted. */
|
||
ecs->event_thread->control.trap_expected = 0;
|
||
|
||
/* If we were nexting/stepping some other thread, switch to
|
||
it, so that we don't continue it, losing control. */
|
||
if (!switch_back_to_stepped_thread (ecs))
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->event_thread->stop_signal () != GDB_SIGNAL_0
|
||
&& (pc_in_thread_step_range (ecs->event_thread->stop_pc (),
|
||
ecs->event_thread)
|
||
|| ecs->event_thread->control.step_range_end == 1)
|
||
&& frame_id_eq (get_stack_frame_id (frame),
|
||
ecs->event_thread->control.step_stack_frame_id)
|
||
&& ecs->event_thread->control.step_resume_breakpoint == NULL)
|
||
{
|
||
/* The inferior is about to take a signal that will take it
|
||
out of the single step range. Set a breakpoint at the
|
||
current PC (which is presumably where the signal handler
|
||
will eventually return) and then allow the inferior to
|
||
run free.
|
||
|
||
Note that this is only needed for a signal delivered
|
||
while in the single-step range. Nested signals aren't a
|
||
problem as they eventually all return. */
|
||
infrun_debug_printf ("signal may take us out of single-step range");
|
||
|
||
clear_step_over_info ();
|
||
insert_hp_step_resume_breakpoint_at_frame (frame);
|
||
ecs->event_thread->step_after_step_resume_breakpoint = 1;
|
||
/* Reset trap_expected to ensure breakpoints are re-inserted. */
|
||
ecs->event_thread->control.trap_expected = 0;
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Note: step_resume_breakpoint may be non-NULL. This occurs
|
||
when either there's a nested signal, or when there's a
|
||
pending signal enabled just as the signal handler returns
|
||
(leaving the inferior at the step-resume-breakpoint without
|
||
actually executing it). Either way continue until the
|
||
breakpoint is really hit. */
|
||
|
||
if (!switch_back_to_stepped_thread (ecs))
|
||
{
|
||
infrun_debug_printf ("random signal, keep going");
|
||
|
||
keep_going (ecs);
|
||
}
|
||
return;
|
||
}
|
||
|
||
process_event_stop_test (ecs);
|
||
}
|
||
|
||
/* Come here when we've got some debug event / signal we can explain
|
||
(IOW, not a random signal), and test whether it should cause a
|
||
stop, or whether we should resume the inferior (transparently).
|
||
E.g., could be a breakpoint whose condition evaluates false; we
|
||
could be still stepping within the line; etc. */
|
||
|
||
static void
|
||
process_event_stop_test (struct execution_control_state *ecs)
|
||
{
|
||
struct symtab_and_line stop_pc_sal;
|
||
struct frame_info *frame;
|
||
struct gdbarch *gdbarch;
|
||
CORE_ADDR jmp_buf_pc;
|
||
struct bpstat_what what;
|
||
|
||
/* Handle cases caused by hitting a breakpoint. */
|
||
|
||
frame = get_current_frame ();
|
||
gdbarch = get_frame_arch (frame);
|
||
|
||
what = bpstat_what (ecs->event_thread->control.stop_bpstat);
|
||
|
||
if (what.call_dummy)
|
||
{
|
||
stop_stack_dummy = what.call_dummy;
|
||
}
|
||
|
||
/* A few breakpoint types have callbacks associated (e.g.,
|
||
bp_jit_event). Run them now. */
|
||
bpstat_run_callbacks (ecs->event_thread->control.stop_bpstat);
|
||
|
||
/* If we hit an internal event that triggers symbol changes, the
|
||
current frame will be invalidated within bpstat_what (e.g., if we
|
||
hit an internal solib event). Re-fetch it. */
|
||
frame = get_current_frame ();
|
||
gdbarch = get_frame_arch (frame);
|
||
|
||
switch (what.main_action)
|
||
{
|
||
case BPSTAT_WHAT_SET_LONGJMP_RESUME:
|
||
/* If we hit the breakpoint at longjmp while stepping, we
|
||
install a momentary breakpoint at the target of the
|
||
jmp_buf. */
|
||
|
||
infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME");
|
||
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
|
||
if (what.is_longjmp)
|
||
{
|
||
struct value *arg_value;
|
||
|
||
/* If we set the longjmp breakpoint via a SystemTap probe,
|
||
then use it to extract the arguments. The destination PC
|
||
is the third argument to the probe. */
|
||
arg_value = probe_safe_evaluate_at_pc (frame, 2);
|
||
if (arg_value)
|
||
{
|
||
jmp_buf_pc = value_as_address (arg_value);
|
||
jmp_buf_pc = gdbarch_addr_bits_remove (gdbarch, jmp_buf_pc);
|
||
}
|
||
else if (!gdbarch_get_longjmp_target_p (gdbarch)
|
||
|| !gdbarch_get_longjmp_target (gdbarch,
|
||
frame, &jmp_buf_pc))
|
||
{
|
||
infrun_debug_printf ("BPSTAT_WHAT_SET_LONGJMP_RESUME "
|
||
"(!gdbarch_get_longjmp_target)");
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Insert a breakpoint at resume address. */
|
||
insert_longjmp_resume_breakpoint (gdbarch, jmp_buf_pc);
|
||
}
|
||
else
|
||
check_exception_resume (ecs, frame);
|
||
keep_going (ecs);
|
||
return;
|
||
|
||
case BPSTAT_WHAT_CLEAR_LONGJMP_RESUME:
|
||
{
|
||
struct frame_info *init_frame;
|
||
|
||
/* There are several cases to consider.
|
||
|
||
1. The initiating frame no longer exists. In this case we
|
||
must stop, because the exception or longjmp has gone too
|
||
far.
|
||
|
||
2. The initiating frame exists, and is the same as the
|
||
current frame. We stop, because the exception or longjmp
|
||
has been caught.
|
||
|
||
3. The initiating frame exists and is different from the
|
||
current frame. This means the exception or longjmp has
|
||
been caught beneath the initiating frame, so keep going.
|
||
|
||
4. longjmp breakpoint has been placed just to protect
|
||
against stale dummy frames and user is not interested in
|
||
stopping around longjmps. */
|
||
|
||
infrun_debug_printf ("BPSTAT_WHAT_CLEAR_LONGJMP_RESUME");
|
||
|
||
gdb_assert (ecs->event_thread->control.exception_resume_breakpoint
|
||
!= NULL);
|
||
delete_exception_resume_breakpoint (ecs->event_thread);
|
||
|
||
if (what.is_longjmp)
|
||
{
|
||
check_longjmp_breakpoint_for_call_dummy (ecs->event_thread);
|
||
|
||
if (!frame_id_p (ecs->event_thread->initiating_frame))
|
||
{
|
||
/* Case 4. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
init_frame = frame_find_by_id (ecs->event_thread->initiating_frame);
|
||
|
||
if (init_frame)
|
||
{
|
||
struct frame_id current_id
|
||
= get_frame_id (get_current_frame ());
|
||
if (frame_id_eq (current_id,
|
||
ecs->event_thread->initiating_frame))
|
||
{
|
||
/* Case 2. Fall through. */
|
||
}
|
||
else
|
||
{
|
||
/* Case 3. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* For Cases 1 and 2, remove the step-resume breakpoint, if it
|
||
exists. */
|
||
delete_step_resume_breakpoint (ecs->event_thread);
|
||
|
||
end_stepping_range (ecs);
|
||
}
|
||
return;
|
||
|
||
case BPSTAT_WHAT_SINGLE:
|
||
infrun_debug_printf ("BPSTAT_WHAT_SINGLE");
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
/* Still need to check other stuff, at least the case where we
|
||
are stepping and step out of the right range. */
|
||
break;
|
||
|
||
case BPSTAT_WHAT_STEP_RESUME:
|
||
infrun_debug_printf ("BPSTAT_WHAT_STEP_RESUME");
|
||
|
||
delete_step_resume_breakpoint (ecs->event_thread);
|
||
if (ecs->event_thread->control.proceed_to_finish
|
||
&& execution_direction == EXEC_REVERSE)
|
||
{
|
||
struct thread_info *tp = ecs->event_thread;
|
||
|
||
/* We are finishing a function in reverse, and just hit the
|
||
step-resume breakpoint at the start address of the
|
||
function, and we're almost there -- just need to back up
|
||
by one more single-step, which should take us back to the
|
||
function call. */
|
||
tp->control.step_range_start = tp->control.step_range_end = 1;
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
fill_in_stop_func (gdbarch, ecs);
|
||
if (ecs->event_thread->stop_pc () == ecs->stop_func_start
|
||
&& execution_direction == EXEC_REVERSE)
|
||
{
|
||
/* We are stepping over a function call in reverse, and just
|
||
hit the step-resume breakpoint at the start address of
|
||
the function. Go back to single-stepping, which should
|
||
take us back to the function call. */
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
break;
|
||
|
||
case BPSTAT_WHAT_STOP_NOISY:
|
||
infrun_debug_printf ("BPSTAT_WHAT_STOP_NOISY");
|
||
stop_print_frame = true;
|
||
|
||
/* Assume the thread stopped for a breakpoint. We'll still check
|
||
whether a/the breakpoint is there when the thread is next
|
||
resumed. */
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
|
||
stop_waiting (ecs);
|
||
return;
|
||
|
||
case BPSTAT_WHAT_STOP_SILENT:
|
||
infrun_debug_printf ("BPSTAT_WHAT_STOP_SILENT");
|
||
stop_print_frame = false;
|
||
|
||
/* Assume the thread stopped for a breakpoint. We'll still check
|
||
whether a/the breakpoint is there when the thread is next
|
||
resumed. */
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
stop_waiting (ecs);
|
||
return;
|
||
|
||
case BPSTAT_WHAT_HP_STEP_RESUME:
|
||
infrun_debug_printf ("BPSTAT_WHAT_HP_STEP_RESUME");
|
||
|
||
delete_step_resume_breakpoint (ecs->event_thread);
|
||
if (ecs->event_thread->step_after_step_resume_breakpoint)
|
||
{
|
||
/* Back when the step-resume breakpoint was inserted, we
|
||
were trying to single-step off a breakpoint. Go back to
|
||
doing that. */
|
||
ecs->event_thread->step_after_step_resume_breakpoint = 0;
|
||
ecs->event_thread->stepping_over_breakpoint = 1;
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
break;
|
||
|
||
case BPSTAT_WHAT_KEEP_CHECKING:
|
||
break;
|
||
}
|
||
|
||
/* If we stepped a permanent breakpoint and we had a high priority
|
||
step-resume breakpoint for the address we stepped, but we didn't
|
||
hit it, then we must have stepped into the signal handler. The
|
||
step-resume was only necessary to catch the case of _not_
|
||
stepping into the handler, so delete it, and fall through to
|
||
checking whether the step finished. */
|
||
if (ecs->event_thread->stepped_breakpoint)
|
||
{
|
||
struct breakpoint *sr_bp
|
||
= ecs->event_thread->control.step_resume_breakpoint;
|
||
|
||
if (sr_bp != NULL
|
||
&& sr_bp->loc->permanent
|
||
&& sr_bp->type == bp_hp_step_resume
|
||
&& sr_bp->loc->address == ecs->event_thread->prev_pc)
|
||
{
|
||
infrun_debug_printf ("stepped permanent breakpoint, stopped in handler");
|
||
delete_step_resume_breakpoint (ecs->event_thread);
|
||
ecs->event_thread->step_after_step_resume_breakpoint = 0;
|
||
}
|
||
}
|
||
|
||
/* We come here if we hit a breakpoint but should not stop for it.
|
||
Possibly we also were stepping and should stop for that. So fall
|
||
through and test for stepping. But, if not stepping, do not
|
||
stop. */
|
||
|
||
/* In all-stop mode, if we're currently stepping but have stopped in
|
||
some other thread, we need to switch back to the stepped thread. */
|
||
if (switch_back_to_stepped_thread (ecs))
|
||
return;
|
||
|
||
if (ecs->event_thread->control.step_resume_breakpoint)
|
||
{
|
||
infrun_debug_printf ("step-resume breakpoint is inserted");
|
||
|
||
/* Having a step-resume breakpoint overrides anything
|
||
else having to do with stepping commands until
|
||
that breakpoint is reached. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->event_thread->control.step_range_end == 0)
|
||
{
|
||
infrun_debug_printf ("no stepping, continue");
|
||
/* Likewise if we aren't even stepping. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Re-fetch current thread's frame in case the code above caused
|
||
the frame cache to be re-initialized, making our FRAME variable
|
||
a dangling pointer. */
|
||
frame = get_current_frame ();
|
||
gdbarch = get_frame_arch (frame);
|
||
fill_in_stop_func (gdbarch, ecs);
|
||
|
||
/* If stepping through a line, keep going if still within it.
|
||
|
||
Note that step_range_end is the address of the first instruction
|
||
beyond the step range, and NOT the address of the last instruction
|
||
within it!
|
||
|
||
Note also that during reverse execution, we may be stepping
|
||
through a function epilogue and therefore must detect when
|
||
the current-frame changes in the middle of a line. */
|
||
|
||
if (pc_in_thread_step_range (ecs->event_thread->stop_pc (),
|
||
ecs->event_thread)
|
||
&& (execution_direction != EXEC_REVERSE
|
||
|| frame_id_eq (get_frame_id (frame),
|
||
ecs->event_thread->control.step_frame_id)))
|
||
{
|
||
infrun_debug_printf
|
||
("stepping inside range [%s-%s]",
|
||
paddress (gdbarch, ecs->event_thread->control.step_range_start),
|
||
paddress (gdbarch, ecs->event_thread->control.step_range_end));
|
||
|
||
/* Tentatively re-enable range stepping; `resume' disables it if
|
||
necessary (e.g., if we're stepping over a breakpoint or we
|
||
have software watchpoints). */
|
||
ecs->event_thread->control.may_range_step = 1;
|
||
|
||
/* When stepping backward, stop at beginning of line range
|
||
(unless it's the function entry point, in which case
|
||
keep going back to the call point). */
|
||
CORE_ADDR stop_pc = ecs->event_thread->stop_pc ();
|
||
if (stop_pc == ecs->event_thread->control.step_range_start
|
||
&& stop_pc != ecs->stop_func_start
|
||
&& execution_direction == EXEC_REVERSE)
|
||
end_stepping_range (ecs);
|
||
else
|
||
keep_going (ecs);
|
||
|
||
return;
|
||
}
|
||
|
||
/* We stepped out of the stepping range. */
|
||
|
||
/* If we are stepping at the source level and entered the runtime
|
||
loader dynamic symbol resolution code...
|
||
|
||
EXEC_FORWARD: we keep on single stepping until we exit the run
|
||
time loader code and reach the callee's address.
|
||
|
||
EXEC_REVERSE: we've already executed the callee (backward), and
|
||
the runtime loader code is handled just like any other
|
||
undebuggable function call. Now we need only keep stepping
|
||
backward through the trampoline code, and that's handled further
|
||
down, so there is nothing for us to do here. */
|
||
|
||
if (execution_direction != EXEC_REVERSE
|
||
&& ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
|
||
&& in_solib_dynsym_resolve_code (ecs->event_thread->stop_pc ()))
|
||
{
|
||
CORE_ADDR pc_after_resolver =
|
||
gdbarch_skip_solib_resolver (gdbarch, ecs->event_thread->stop_pc ());
|
||
|
||
infrun_debug_printf ("stepped into dynsym resolve code");
|
||
|
||
if (pc_after_resolver)
|
||
{
|
||
/* Set up a step-resume breakpoint at the address
|
||
indicated by SKIP_SOLIB_RESOLVER. */
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = pc_after_resolver;
|
||
sr_sal.pspace = get_frame_program_space (frame);
|
||
|
||
insert_step_resume_breakpoint_at_sal (gdbarch,
|
||
sr_sal, null_frame_id);
|
||
}
|
||
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Step through an indirect branch thunk. */
|
||
if (ecs->event_thread->control.step_over_calls != STEP_OVER_NONE
|
||
&& gdbarch_in_indirect_branch_thunk (gdbarch,
|
||
ecs->event_thread->stop_pc ()))
|
||
{
|
||
infrun_debug_printf ("stepped into indirect branch thunk");
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->event_thread->control.step_range_end != 1
|
||
&& (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
|
||
|| ecs->event_thread->control.step_over_calls == STEP_OVER_ALL)
|
||
&& get_frame_type (frame) == SIGTRAMP_FRAME)
|
||
{
|
||
infrun_debug_printf ("stepped into signal trampoline");
|
||
/* The inferior, while doing a "step" or "next", has ended up in
|
||
a signal trampoline (either by a signal being delivered or by
|
||
the signal handler returning). Just single-step until the
|
||
inferior leaves the trampoline (either by calling the handler
|
||
or returning). */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* If we're in the return path from a shared library trampoline,
|
||
we want to proceed through the trampoline when stepping. */
|
||
/* macro/2012-04-25: This needs to come before the subroutine
|
||
call check below as on some targets return trampolines look
|
||
like subroutine calls (MIPS16 return thunks). */
|
||
if (gdbarch_in_solib_return_trampoline (gdbarch,
|
||
ecs->event_thread->stop_pc (),
|
||
ecs->stop_func_name)
|
||
&& ecs->event_thread->control.step_over_calls != STEP_OVER_NONE)
|
||
{
|
||
/* Determine where this trampoline returns. */
|
||
CORE_ADDR stop_pc = ecs->event_thread->stop_pc ();
|
||
CORE_ADDR real_stop_pc
|
||
= gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
|
||
|
||
infrun_debug_printf ("stepped into solib return tramp");
|
||
|
||
/* Only proceed through if we know where it's going. */
|
||
if (real_stop_pc)
|
||
{
|
||
/* And put the step-breakpoint there and go until there. */
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = real_stop_pc;
|
||
sr_sal.section = find_pc_overlay (sr_sal.pc);
|
||
sr_sal.pspace = get_frame_program_space (frame);
|
||
|
||
/* Do not specify what the fp should be when we stop since
|
||
on some machines the prologue is where the new fp value
|
||
is established. */
|
||
insert_step_resume_breakpoint_at_sal (gdbarch,
|
||
sr_sal, null_frame_id);
|
||
|
||
/* Restart without fiddling with the step ranges or
|
||
other state. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Check for subroutine calls. The check for the current frame
|
||
equalling the step ID is not necessary - the check of the
|
||
previous frame's ID is sufficient - but it is a common case and
|
||
cheaper than checking the previous frame's ID.
|
||
|
||
NOTE: frame_id_eq will never report two invalid frame IDs as
|
||
being equal, so to get into this block, both the current and
|
||
previous frame must have valid frame IDs. */
|
||
/* The outer_frame_id check is a heuristic to detect stepping
|
||
through startup code. If we step over an instruction which
|
||
sets the stack pointer from an invalid value to a valid value,
|
||
we may detect that as a subroutine call from the mythical
|
||
"outermost" function. This could be fixed by marking
|
||
outermost frames as !stack_p,code_p,special_p. Then the
|
||
initial outermost frame, before sp was valid, would
|
||
have code_addr == &_start. See the comment in frame_id_eq
|
||
for more. */
|
||
if (!frame_id_eq (get_stack_frame_id (frame),
|
||
ecs->event_thread->control.step_stack_frame_id)
|
||
&& (frame_id_eq (frame_unwind_caller_id (get_current_frame ()),
|
||
ecs->event_thread->control.step_stack_frame_id)
|
||
&& (!frame_id_eq (ecs->event_thread->control.step_stack_frame_id,
|
||
outer_frame_id)
|
||
|| (ecs->event_thread->control.step_start_function
|
||
!= find_pc_function (ecs->event_thread->stop_pc ())))))
|
||
{
|
||
CORE_ADDR stop_pc = ecs->event_thread->stop_pc ();
|
||
CORE_ADDR real_stop_pc;
|
||
|
||
infrun_debug_printf ("stepped into subroutine");
|
||
|
||
if (ecs->event_thread->control.step_over_calls == STEP_OVER_NONE)
|
||
{
|
||
/* I presume that step_over_calls is only 0 when we're
|
||
supposed to be stepping at the assembly language level
|
||
("stepi"). Just stop. */
|
||
/* And this works the same backward as frontward. MVS */
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Reverse stepping through solib trampolines. */
|
||
|
||
if (execution_direction == EXEC_REVERSE
|
||
&& ecs->event_thread->control.step_over_calls != STEP_OVER_NONE
|
||
&& (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc)
|
||
|| (ecs->stop_func_start == 0
|
||
&& in_solib_dynsym_resolve_code (stop_pc))))
|
||
{
|
||
/* Any solib trampoline code can be handled in reverse
|
||
by simply continuing to single-step. We have already
|
||
executed the solib function (backwards), and a few
|
||
steps will take us back through the trampoline to the
|
||
caller. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL)
|
||
{
|
||
/* We're doing a "next".
|
||
|
||
Normal (forward) execution: set a breakpoint at the
|
||
callee's return address (the address at which the caller
|
||
will resume).
|
||
|
||
Reverse (backward) execution. set the step-resume
|
||
breakpoint at the start of the function that we just
|
||
stepped into (backwards), and continue to there. When we
|
||
get there, we'll need to single-step back to the caller. */
|
||
|
||
if (execution_direction == EXEC_REVERSE)
|
||
{
|
||
/* If we're already at the start of the function, we've either
|
||
just stepped backward into a single instruction function,
|
||
or stepped back out of a signal handler to the first instruction
|
||
of the function. Just keep going, which will single-step back
|
||
to the caller. */
|
||
if (ecs->stop_func_start != stop_pc && ecs->stop_func_start != 0)
|
||
{
|
||
/* Normal function call return (static or dynamic). */
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = ecs->stop_func_start;
|
||
sr_sal.pspace = get_frame_program_space (frame);
|
||
insert_step_resume_breakpoint_at_sal (gdbarch,
|
||
sr_sal, null_frame_id);
|
||
}
|
||
}
|
||
else
|
||
insert_step_resume_breakpoint_at_caller (frame);
|
||
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* If we are in a function call trampoline (a stub between the
|
||
calling routine and the real function), locate the real
|
||
function. That's what tells us (a) whether we want to step
|
||
into it at all, and (b) what prologue we want to run to the
|
||
end of, if we do step into it. */
|
||
real_stop_pc = skip_language_trampoline (frame, stop_pc);
|
||
if (real_stop_pc == 0)
|
||
real_stop_pc = gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc);
|
||
if (real_stop_pc != 0)
|
||
ecs->stop_func_start = real_stop_pc;
|
||
|
||
if (real_stop_pc != 0 && in_solib_dynsym_resolve_code (real_stop_pc))
|
||
{
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = ecs->stop_func_start;
|
||
sr_sal.pspace = get_frame_program_space (frame);
|
||
|
||
insert_step_resume_breakpoint_at_sal (gdbarch,
|
||
sr_sal, null_frame_id);
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* If we have line number information for the function we are
|
||
thinking of stepping into and the function isn't on the skip
|
||
list, step into it.
|
||
|
||
If there are several symtabs at that PC (e.g. with include
|
||
files), just want to know whether *any* of them have line
|
||
numbers. find_pc_line handles this. */
|
||
{
|
||
struct symtab_and_line tmp_sal;
|
||
|
||
tmp_sal = find_pc_line (ecs->stop_func_start, 0);
|
||
if (tmp_sal.line != 0
|
||
&& !function_name_is_marked_for_skip (ecs->stop_func_name,
|
||
tmp_sal)
|
||
&& !inline_frame_is_marked_for_skip (true, ecs->event_thread))
|
||
{
|
||
if (execution_direction == EXEC_REVERSE)
|
||
handle_step_into_function_backward (gdbarch, ecs);
|
||
else
|
||
handle_step_into_function (gdbarch, ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* If we have no line number and the step-stop-if-no-debug is
|
||
set, we stop the step so that the user has a chance to switch
|
||
in assembly mode. */
|
||
if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
|
||
&& step_stop_if_no_debug)
|
||
{
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
|
||
if (execution_direction == EXEC_REVERSE)
|
||
{
|
||
/* If we're already at the start of the function, we've either just
|
||
stepped backward into a single instruction function without line
|
||
number info, or stepped back out of a signal handler to the first
|
||
instruction of the function without line number info. Just keep
|
||
going, which will single-step back to the caller. */
|
||
if (ecs->stop_func_start != stop_pc)
|
||
{
|
||
/* Set a breakpoint at callee's start address.
|
||
From there we can step once and be back in the caller. */
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = ecs->stop_func_start;
|
||
sr_sal.pspace = get_frame_program_space (frame);
|
||
insert_step_resume_breakpoint_at_sal (gdbarch,
|
||
sr_sal, null_frame_id);
|
||
}
|
||
}
|
||
else
|
||
/* Set a breakpoint at callee's return address (the address
|
||
at which the caller will resume). */
|
||
insert_step_resume_breakpoint_at_caller (frame);
|
||
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Reverse stepping through solib trampolines. */
|
||
|
||
if (execution_direction == EXEC_REVERSE
|
||
&& ecs->event_thread->control.step_over_calls != STEP_OVER_NONE)
|
||
{
|
||
CORE_ADDR stop_pc = ecs->event_thread->stop_pc ();
|
||
|
||
if (gdbarch_skip_trampoline_code (gdbarch, frame, stop_pc)
|
||
|| (ecs->stop_func_start == 0
|
||
&& in_solib_dynsym_resolve_code (stop_pc)))
|
||
{
|
||
/* Any solib trampoline code can be handled in reverse
|
||
by simply continuing to single-step. We have already
|
||
executed the solib function (backwards), and a few
|
||
steps will take us back through the trampoline to the
|
||
caller. */
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
else if (in_solib_dynsym_resolve_code (stop_pc))
|
||
{
|
||
/* Stepped backward into the solib dynsym resolver.
|
||
Set a breakpoint at its start and continue, then
|
||
one more step will take us out. */
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = ecs->stop_func_start;
|
||
sr_sal.pspace = get_frame_program_space (frame);
|
||
insert_step_resume_breakpoint_at_sal (gdbarch,
|
||
sr_sal, null_frame_id);
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* This always returns the sal for the inner-most frame when we are in a
|
||
stack of inlined frames, even if GDB actually believes that it is in a
|
||
more outer frame. This is checked for below by calls to
|
||
inline_skipped_frames. */
|
||
stop_pc_sal = find_pc_line (ecs->event_thread->stop_pc (), 0);
|
||
|
||
/* NOTE: tausq/2004-05-24: This if block used to be done before all
|
||
the trampoline processing logic, however, there are some trampolines
|
||
that have no names, so we should do trampoline handling first. */
|
||
if (ecs->event_thread->control.step_over_calls == STEP_OVER_UNDEBUGGABLE
|
||
&& ecs->stop_func_name == NULL
|
||
&& stop_pc_sal.line == 0)
|
||
{
|
||
infrun_debug_printf ("stepped into undebuggable function");
|
||
|
||
/* The inferior just stepped into, or returned to, an
|
||
undebuggable function (where there is no debugging information
|
||
and no line number corresponding to the address where the
|
||
inferior stopped). Since we want to skip this kind of code,
|
||
we keep going until the inferior returns from this
|
||
function - unless the user has asked us not to (via
|
||
set step-mode) or we no longer know how to get back
|
||
to the call site. */
|
||
if (step_stop_if_no_debug
|
||
|| !frame_id_p (frame_unwind_caller_id (frame)))
|
||
{
|
||
/* If we have no line number and the step-stop-if-no-debug
|
||
is set, we stop the step so that the user has a chance to
|
||
switch in assembly mode. */
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
else
|
||
{
|
||
/* Set a breakpoint at callee's return address (the address
|
||
at which the caller will resume). */
|
||
insert_step_resume_breakpoint_at_caller (frame);
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
if (ecs->event_thread->control.step_range_end == 1)
|
||
{
|
||
/* It is stepi or nexti. We always want to stop stepping after
|
||
one instruction. */
|
||
infrun_debug_printf ("stepi/nexti");
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
|
||
if (stop_pc_sal.line == 0)
|
||
{
|
||
/* We have no line number information. That means to stop
|
||
stepping (does this always happen right after one instruction,
|
||
when we do "s" in a function with no line numbers,
|
||
or can this happen as a result of a return or longjmp?). */
|
||
infrun_debug_printf ("line number info");
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
|
||
/* Look for "calls" to inlined functions, part one. If the inline
|
||
frame machinery detected some skipped call sites, we have entered
|
||
a new inline function. */
|
||
|
||
if (frame_id_eq (get_frame_id (get_current_frame ()),
|
||
ecs->event_thread->control.step_frame_id)
|
||
&& inline_skipped_frames (ecs->event_thread))
|
||
{
|
||
infrun_debug_printf ("stepped into inlined function");
|
||
|
||
symtab_and_line call_sal = find_frame_sal (get_current_frame ());
|
||
|
||
if (ecs->event_thread->control.step_over_calls != STEP_OVER_ALL)
|
||
{
|
||
/* For "step", we're going to stop. But if the call site
|
||
for this inlined function is on the same source line as
|
||
we were previously stepping, go down into the function
|
||
first. Otherwise stop at the call site. */
|
||
|
||
if (call_sal.line == ecs->event_thread->current_line
|
||
&& call_sal.symtab == ecs->event_thread->current_symtab)
|
||
{
|
||
step_into_inline_frame (ecs->event_thread);
|
||
if (inline_frame_is_marked_for_skip (false, ecs->event_thread))
|
||
{
|
||
keep_going (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
else
|
||
{
|
||
/* For "next", we should stop at the call site if it is on a
|
||
different source line. Otherwise continue through the
|
||
inlined function. */
|
||
if (call_sal.line == ecs->event_thread->current_line
|
||
&& call_sal.symtab == ecs->event_thread->current_symtab)
|
||
keep_going (ecs);
|
||
else
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Look for "calls" to inlined functions, part two. If we are still
|
||
in the same real function we were stepping through, but we have
|
||
to go further up to find the exact frame ID, we are stepping
|
||
through a more inlined call beyond its call site. */
|
||
|
||
if (get_frame_type (get_current_frame ()) == INLINE_FRAME
|
||
&& !frame_id_eq (get_frame_id (get_current_frame ()),
|
||
ecs->event_thread->control.step_frame_id)
|
||
&& stepped_in_from (get_current_frame (),
|
||
ecs->event_thread->control.step_frame_id))
|
||
{
|
||
infrun_debug_printf ("stepping through inlined function");
|
||
|
||
if (ecs->event_thread->control.step_over_calls == STEP_OVER_ALL
|
||
|| inline_frame_is_marked_for_skip (false, ecs->event_thread))
|
||
keep_going (ecs);
|
||
else
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
|
||
bool refresh_step_info = true;
|
||
if ((ecs->event_thread->stop_pc () == stop_pc_sal.pc)
|
||
&& (ecs->event_thread->current_line != stop_pc_sal.line
|
||
|| ecs->event_thread->current_symtab != stop_pc_sal.symtab))
|
||
{
|
||
/* We are at a different line. */
|
||
|
||
if (stop_pc_sal.is_stmt)
|
||
{
|
||
/* We are at the start of a statement.
|
||
|
||
So stop. Note that we don't stop if we step into the middle of a
|
||
statement. That is said to make things like for (;;) statements
|
||
work better. */
|
||
infrun_debug_printf ("stepped to a different line");
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
else if (frame_id_eq (get_frame_id (get_current_frame ()),
|
||
ecs->event_thread->control.step_frame_id))
|
||
{
|
||
/* We are not at the start of a statement, and we have not changed
|
||
frame.
|
||
|
||
We ignore this line table entry, and continue stepping forward,
|
||
looking for a better place to stop. */
|
||
refresh_step_info = false;
|
||
infrun_debug_printf ("stepped to a different line, but "
|
||
"it's not the start of a statement");
|
||
}
|
||
else
|
||
{
|
||
/* We are not the start of a statement, and we have changed frame.
|
||
|
||
We ignore this line table entry, and continue stepping forward,
|
||
looking for a better place to stop. Keep refresh_step_info at
|
||
true to note that the frame has changed, but ignore the line
|
||
number to make sure we don't ignore a subsequent entry with the
|
||
same line number. */
|
||
stop_pc_sal.line = 0;
|
||
infrun_debug_printf ("stepped to a different frame, but "
|
||
"it's not the start of a statement");
|
||
}
|
||
}
|
||
|
||
/* We aren't done stepping.
|
||
|
||
Optimize by setting the stepping range to the line.
|
||
(We might not be in the original line, but if we entered a
|
||
new line in mid-statement, we continue stepping. This makes
|
||
things like for(;;) statements work better.)
|
||
|
||
If we entered a SAL that indicates a non-statement line table entry,
|
||
then we update the stepping range, but we don't update the step info,
|
||
which includes things like the line number we are stepping away from.
|
||
This means we will stop when we find a line table entry that is marked
|
||
as is-statement, even if it matches the non-statement one we just
|
||
stepped into. */
|
||
|
||
ecs->event_thread->control.step_range_start = stop_pc_sal.pc;
|
||
ecs->event_thread->control.step_range_end = stop_pc_sal.end;
|
||
ecs->event_thread->control.may_range_step = 1;
|
||
infrun_debug_printf
|
||
("updated step range, start = %s, end = %s, may_range_step = %d",
|
||
paddress (gdbarch, ecs->event_thread->control.step_range_start),
|
||
paddress (gdbarch, ecs->event_thread->control.step_range_end),
|
||
ecs->event_thread->control.may_range_step);
|
||
if (refresh_step_info)
|
||
set_step_info (ecs->event_thread, frame, stop_pc_sal);
|
||
|
||
infrun_debug_printf ("keep going");
|
||
keep_going (ecs);
|
||
}
|
||
|
||
static bool restart_stepped_thread (process_stratum_target *resume_target,
|
||
ptid_t resume_ptid);
|
||
|
||
/* In all-stop mode, if we're currently stepping but have stopped in
|
||
some other thread, we may need to switch back to the stepped
|
||
thread. Returns true we set the inferior running, false if we left
|
||
it stopped (and the event needs further processing). */
|
||
|
||
static bool
|
||
switch_back_to_stepped_thread (struct execution_control_state *ecs)
|
||
{
|
||
if (!target_is_non_stop_p ())
|
||
{
|
||
/* If any thread is blocked on some internal breakpoint, and we
|
||
simply need to step over that breakpoint to get it going
|
||
again, do that first. */
|
||
|
||
/* However, if we see an event for the stepping thread, then we
|
||
know all other threads have been moved past their breakpoints
|
||
already. Let the caller check whether the step is finished,
|
||
etc., before deciding to move it past a breakpoint. */
|
||
if (ecs->event_thread->control.step_range_end != 0)
|
||
return false;
|
||
|
||
/* Check if the current thread is blocked on an incomplete
|
||
step-over, interrupted by a random signal. */
|
||
if (ecs->event_thread->control.trap_expected
|
||
&& ecs->event_thread->stop_signal () != GDB_SIGNAL_TRAP)
|
||
{
|
||
infrun_debug_printf
|
||
("need to finish step-over of [%s]",
|
||
ecs->event_thread->ptid.to_string ().c_str ());
|
||
keep_going (ecs);
|
||
return true;
|
||
}
|
||
|
||
/* Check if the current thread is blocked by a single-step
|
||
breakpoint of another thread. */
|
||
if (ecs->hit_singlestep_breakpoint)
|
||
{
|
||
infrun_debug_printf ("need to step [%s] over single-step breakpoint",
|
||
ecs->ptid.to_string ().c_str ());
|
||
keep_going (ecs);
|
||
return true;
|
||
}
|
||
|
||
/* If this thread needs yet another step-over (e.g., stepping
|
||
through a delay slot), do it first before moving on to
|
||
another thread. */
|
||
if (thread_still_needs_step_over (ecs->event_thread))
|
||
{
|
||
infrun_debug_printf
|
||
("thread [%s] still needs step-over",
|
||
ecs->event_thread->ptid.to_string ().c_str ());
|
||
keep_going (ecs);
|
||
return true;
|
||
}
|
||
|
||
/* If scheduler locking applies even if not stepping, there's no
|
||
need to walk over threads. Above we've checked whether the
|
||
current thread is stepping. If some other thread not the
|
||
event thread is stepping, then it must be that scheduler
|
||
locking is not in effect. */
|
||
if (schedlock_applies (ecs->event_thread))
|
||
return false;
|
||
|
||
/* Otherwise, we no longer expect a trap in the current thread.
|
||
Clear the trap_expected flag before switching back -- this is
|
||
what keep_going does as well, if we call it. */
|
||
ecs->event_thread->control.trap_expected = 0;
|
||
|
||
/* Likewise, clear the signal if it should not be passed. */
|
||
if (!signal_program[ecs->event_thread->stop_signal ()])
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
if (restart_stepped_thread (ecs->target, ecs->ptid))
|
||
{
|
||
prepare_to_wait (ecs);
|
||
return true;
|
||
}
|
||
|
||
switch_to_thread (ecs->event_thread);
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* Look for the thread that was stepping, and resume it.
|
||
RESUME_TARGET / RESUME_PTID indicate the set of threads the caller
|
||
is resuming. Return true if a thread was started, false
|
||
otherwise. */
|
||
|
||
static bool
|
||
restart_stepped_thread (process_stratum_target *resume_target,
|
||
ptid_t resume_ptid)
|
||
{
|
||
/* Do all pending step-overs before actually proceeding with
|
||
step/next/etc. */
|
||
if (start_step_over ())
|
||
return true;
|
||
|
||
for (thread_info *tp : all_threads_safe ())
|
||
{
|
||
if (tp->state == THREAD_EXITED)
|
||
continue;
|
||
|
||
if (tp->has_pending_waitstatus ())
|
||
continue;
|
||
|
||
/* Ignore threads of processes the caller is not
|
||
resuming. */
|
||
if (!sched_multi
|
||
&& (tp->inf->process_target () != resume_target
|
||
|| tp->inf->pid != resume_ptid.pid ()))
|
||
continue;
|
||
|
||
if (tp->control.trap_expected)
|
||
{
|
||
infrun_debug_printf ("switching back to stepped thread (step-over)");
|
||
|
||
if (keep_going_stepped_thread (tp))
|
||
return true;
|
||
}
|
||
}
|
||
|
||
for (thread_info *tp : all_threads_safe ())
|
||
{
|
||
if (tp->state == THREAD_EXITED)
|
||
continue;
|
||
|
||
if (tp->has_pending_waitstatus ())
|
||
continue;
|
||
|
||
/* Ignore threads of processes the caller is not
|
||
resuming. */
|
||
if (!sched_multi
|
||
&& (tp->inf->process_target () != resume_target
|
||
|| tp->inf->pid != resume_ptid.pid ()))
|
||
continue;
|
||
|
||
/* Did we find the stepping thread? */
|
||
if (tp->control.step_range_end)
|
||
{
|
||
infrun_debug_printf ("switching back to stepped thread (stepping)");
|
||
|
||
if (keep_going_stepped_thread (tp))
|
||
return true;
|
||
}
|
||
}
|
||
|
||
return false;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
restart_after_all_stop_detach (process_stratum_target *proc_target)
|
||
{
|
||
/* Note we don't check target_is_non_stop_p() here, because the
|
||
current inferior may no longer have a process_stratum target
|
||
pushed, as we just detached. */
|
||
|
||
/* See if we have a THREAD_RUNNING thread that need to be
|
||
re-resumed. If we have any thread that is already executing,
|
||
then we don't need to resume the target -- it is already been
|
||
resumed. With the remote target (in all-stop), it's even
|
||
impossible to issue another resumption if the target is already
|
||
resumed, until the target reports a stop. */
|
||
for (thread_info *thr : all_threads (proc_target))
|
||
{
|
||
if (thr->state != THREAD_RUNNING)
|
||
continue;
|
||
|
||
/* If we have any thread that is already executing, then we
|
||
don't need to resume the target -- it is already been
|
||
resumed. */
|
||
if (thr->executing ())
|
||
return;
|
||
|
||
/* If we have a pending event to process, skip resuming the
|
||
target and go straight to processing it. */
|
||
if (thr->resumed () && thr->has_pending_waitstatus ())
|
||
return;
|
||
}
|
||
|
||
/* Alright, we need to re-resume the target. If a thread was
|
||
stepping, we need to restart it stepping. */
|
||
if (restart_stepped_thread (proc_target, minus_one_ptid))
|
||
return;
|
||
|
||
/* Otherwise, find the first THREAD_RUNNING thread and resume
|
||
it. */
|
||
for (thread_info *thr : all_threads (proc_target))
|
||
{
|
||
if (thr->state != THREAD_RUNNING)
|
||
continue;
|
||
|
||
execution_control_state ecs;
|
||
reset_ecs (&ecs, thr);
|
||
switch_to_thread (thr);
|
||
keep_going (&ecs);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Set a previously stepped thread back to stepping. Returns true on
|
||
success, false if the resume is not possible (e.g., the thread
|
||
vanished). */
|
||
|
||
static bool
|
||
keep_going_stepped_thread (struct thread_info *tp)
|
||
{
|
||
struct frame_info *frame;
|
||
struct execution_control_state ecss;
|
||
struct execution_control_state *ecs = &ecss;
|
||
|
||
/* If the stepping thread exited, then don't try to switch back and
|
||
resume it, which could fail in several different ways depending
|
||
on the target. Instead, just keep going.
|
||
|
||
We can find a stepping dead thread in the thread list in two
|
||
cases:
|
||
|
||
- The target supports thread exit events, and when the target
|
||
tries to delete the thread from the thread list, inferior_ptid
|
||
pointed at the exiting thread. In such case, calling
|
||
delete_thread does not really remove the thread from the list;
|
||
instead, the thread is left listed, with 'exited' state.
|
||
|
||
- The target's debug interface does not support thread exit
|
||
events, and so we have no idea whatsoever if the previously
|
||
stepping thread is still alive. For that reason, we need to
|
||
synchronously query the target now. */
|
||
|
||
if (tp->state == THREAD_EXITED || !target_thread_alive (tp->ptid))
|
||
{
|
||
infrun_debug_printf ("not resuming previously stepped thread, it has "
|
||
"vanished");
|
||
|
||
delete_thread (tp);
|
||
return false;
|
||
}
|
||
|
||
infrun_debug_printf ("resuming previously stepped thread");
|
||
|
||
reset_ecs (ecs, tp);
|
||
switch_to_thread (tp);
|
||
|
||
tp->set_stop_pc (regcache_read_pc (get_thread_regcache (tp)));
|
||
frame = get_current_frame ();
|
||
|
||
/* If the PC of the thread we were trying to single-step has
|
||
changed, then that thread has trapped or been signaled, but the
|
||
event has not been reported to GDB yet. Re-poll the target
|
||
looking for this particular thread's event (i.e. temporarily
|
||
enable schedlock) by:
|
||
|
||
- setting a break at the current PC
|
||
- resuming that particular thread, only (by setting trap
|
||
expected)
|
||
|
||
This prevents us continuously moving the single-step breakpoint
|
||
forward, one instruction at a time, overstepping. */
|
||
|
||
if (tp->stop_pc () != tp->prev_pc)
|
||
{
|
||
ptid_t resume_ptid;
|
||
|
||
infrun_debug_printf ("expected thread advanced also (%s -> %s)",
|
||
paddress (target_gdbarch (), tp->prev_pc),
|
||
paddress (target_gdbarch (), tp->stop_pc ()));
|
||
|
||
/* Clear the info of the previous step-over, as it's no longer
|
||
valid (if the thread was trying to step over a breakpoint, it
|
||
has already succeeded). It's what keep_going would do too,
|
||
if we called it. Do this before trying to insert the sss
|
||
breakpoint, otherwise if we were previously trying to step
|
||
over this exact address in another thread, the breakpoint is
|
||
skipped. */
|
||
clear_step_over_info ();
|
||
tp->control.trap_expected = 0;
|
||
|
||
insert_single_step_breakpoint (get_frame_arch (frame),
|
||
get_frame_address_space (frame),
|
||
tp->stop_pc ());
|
||
|
||
tp->set_resumed (true);
|
||
resume_ptid = internal_resume_ptid (tp->control.stepping_command);
|
||
do_target_resume (resume_ptid, false, GDB_SIGNAL_0);
|
||
}
|
||
else
|
||
{
|
||
infrun_debug_printf ("expected thread still hasn't advanced");
|
||
|
||
keep_going_pass_signal (ecs);
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Is thread TP in the middle of (software or hardware)
|
||
single-stepping? (Note the result of this function must never be
|
||
passed directly as target_resume's STEP parameter.) */
|
||
|
||
static bool
|
||
currently_stepping (struct thread_info *tp)
|
||
{
|
||
return ((tp->control.step_range_end
|
||
&& tp->control.step_resume_breakpoint == NULL)
|
||
|| tp->control.trap_expected
|
||
|| tp->stepped_breakpoint
|
||
|| bpstat_should_step ());
|
||
}
|
||
|
||
/* Inferior has stepped into a subroutine call with source code that
|
||
we should not step over. Do step to the first line of code in
|
||
it. */
|
||
|
||
static void
|
||
handle_step_into_function (struct gdbarch *gdbarch,
|
||
struct execution_control_state *ecs)
|
||
{
|
||
fill_in_stop_func (gdbarch, ecs);
|
||
|
||
compunit_symtab *cust
|
||
= find_pc_compunit_symtab (ecs->event_thread->stop_pc ());
|
||
if (cust != NULL && compunit_language (cust) != language_asm)
|
||
ecs->stop_func_start
|
||
= gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start);
|
||
|
||
symtab_and_line stop_func_sal = find_pc_line (ecs->stop_func_start, 0);
|
||
/* Use the step_resume_break to step until the end of the prologue,
|
||
even if that involves jumps (as it seems to on the vax under
|
||
4.2). */
|
||
/* If the prologue ends in the middle of a source line, continue to
|
||
the end of that source line (if it is still within the function).
|
||
Otherwise, just go to end of prologue. */
|
||
if (stop_func_sal.end
|
||
&& stop_func_sal.pc != ecs->stop_func_start
|
||
&& stop_func_sal.end < ecs->stop_func_end)
|
||
ecs->stop_func_start = stop_func_sal.end;
|
||
|
||
/* Architectures which require breakpoint adjustment might not be able
|
||
to place a breakpoint at the computed address. If so, the test
|
||
``ecs->stop_func_start == stop_pc'' will never succeed. Adjust
|
||
ecs->stop_func_start to an address at which a breakpoint may be
|
||
legitimately placed.
|
||
|
||
Note: kevinb/2004-01-19: On FR-V, if this adjustment is not
|
||
made, GDB will enter an infinite loop when stepping through
|
||
optimized code consisting of VLIW instructions which contain
|
||
subinstructions corresponding to different source lines. On
|
||
FR-V, it's not permitted to place a breakpoint on any but the
|
||
first subinstruction of a VLIW instruction. When a breakpoint is
|
||
set, GDB will adjust the breakpoint address to the beginning of
|
||
the VLIW instruction. Thus, we need to make the corresponding
|
||
adjustment here when computing the stop address. */
|
||
|
||
if (gdbarch_adjust_breakpoint_address_p (gdbarch))
|
||
{
|
||
ecs->stop_func_start
|
||
= gdbarch_adjust_breakpoint_address (gdbarch,
|
||
ecs->stop_func_start);
|
||
}
|
||
|
||
if (ecs->stop_func_start == ecs->event_thread->stop_pc ())
|
||
{
|
||
/* We are already there: stop now. */
|
||
end_stepping_range (ecs);
|
||
return;
|
||
}
|
||
else
|
||
{
|
||
/* Put the step-breakpoint there and go until there. */
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = ecs->stop_func_start;
|
||
sr_sal.section = find_pc_overlay (ecs->stop_func_start);
|
||
sr_sal.pspace = get_frame_program_space (get_current_frame ());
|
||
|
||
/* Do not specify what the fp should be when we stop since on
|
||
some machines the prologue is where the new fp value is
|
||
established. */
|
||
insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal, null_frame_id);
|
||
|
||
/* And make sure stepping stops right away then. */
|
||
ecs->event_thread->control.step_range_end
|
||
= ecs->event_thread->control.step_range_start;
|
||
}
|
||
keep_going (ecs);
|
||
}
|
||
|
||
/* Inferior has stepped backward into a subroutine call with source
|
||
code that we should not step over. Do step to the beginning of the
|
||
last line of code in it. */
|
||
|
||
static void
|
||
handle_step_into_function_backward (struct gdbarch *gdbarch,
|
||
struct execution_control_state *ecs)
|
||
{
|
||
struct compunit_symtab *cust;
|
||
struct symtab_and_line stop_func_sal;
|
||
|
||
fill_in_stop_func (gdbarch, ecs);
|
||
|
||
cust = find_pc_compunit_symtab (ecs->event_thread->stop_pc ());
|
||
if (cust != NULL && compunit_language (cust) != language_asm)
|
||
ecs->stop_func_start
|
||
= gdbarch_skip_prologue_noexcept (gdbarch, ecs->stop_func_start);
|
||
|
||
stop_func_sal = find_pc_line (ecs->event_thread->stop_pc (), 0);
|
||
|
||
/* OK, we're just going to keep stepping here. */
|
||
if (stop_func_sal.pc == ecs->event_thread->stop_pc ())
|
||
{
|
||
/* We're there already. Just stop stepping now. */
|
||
end_stepping_range (ecs);
|
||
}
|
||
else
|
||
{
|
||
/* Else just reset the step range and keep going.
|
||
No step-resume breakpoint, they don't work for
|
||
epilogues, which can have multiple entry paths. */
|
||
ecs->event_thread->control.step_range_start = stop_func_sal.pc;
|
||
ecs->event_thread->control.step_range_end = stop_func_sal.end;
|
||
keep_going (ecs);
|
||
}
|
||
return;
|
||
}
|
||
|
||
/* Insert a "step-resume breakpoint" at SR_SAL with frame ID SR_ID.
|
||
This is used to both functions and to skip over code. */
|
||
|
||
static void
|
||
insert_step_resume_breakpoint_at_sal_1 (struct gdbarch *gdbarch,
|
||
struct symtab_and_line sr_sal,
|
||
struct frame_id sr_id,
|
||
enum bptype sr_type)
|
||
{
|
||
/* There should never be more than one step-resume or longjmp-resume
|
||
breakpoint per thread, so we should never be setting a new
|
||
step_resume_breakpoint when one is already active. */
|
||
gdb_assert (inferior_thread ()->control.step_resume_breakpoint == NULL);
|
||
gdb_assert (sr_type == bp_step_resume || sr_type == bp_hp_step_resume);
|
||
|
||
infrun_debug_printf ("inserting step-resume breakpoint at %s",
|
||
paddress (gdbarch, sr_sal.pc));
|
||
|
||
inferior_thread ()->control.step_resume_breakpoint
|
||
= set_momentary_breakpoint (gdbarch, sr_sal, sr_id, sr_type).release ();
|
||
}
|
||
|
||
void
|
||
insert_step_resume_breakpoint_at_sal (struct gdbarch *gdbarch,
|
||
struct symtab_and_line sr_sal,
|
||
struct frame_id sr_id)
|
||
{
|
||
insert_step_resume_breakpoint_at_sal_1 (gdbarch,
|
||
sr_sal, sr_id,
|
||
bp_step_resume);
|
||
}
|
||
|
||
/* Insert a "high-priority step-resume breakpoint" at RETURN_FRAME.pc.
|
||
This is used to skip a potential signal handler.
|
||
|
||
This is called with the interrupted function's frame. The signal
|
||
handler, when it returns, will resume the interrupted function at
|
||
RETURN_FRAME.pc. */
|
||
|
||
static void
|
||
insert_hp_step_resume_breakpoint_at_frame (struct frame_info *return_frame)
|
||
{
|
||
gdb_assert (return_frame != NULL);
|
||
|
||
struct gdbarch *gdbarch = get_frame_arch (return_frame);
|
||
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = gdbarch_addr_bits_remove (gdbarch, get_frame_pc (return_frame));
|
||
sr_sal.section = find_pc_overlay (sr_sal.pc);
|
||
sr_sal.pspace = get_frame_program_space (return_frame);
|
||
|
||
insert_step_resume_breakpoint_at_sal_1 (gdbarch, sr_sal,
|
||
get_stack_frame_id (return_frame),
|
||
bp_hp_step_resume);
|
||
}
|
||
|
||
/* Insert a "step-resume breakpoint" at the previous frame's PC. This
|
||
is used to skip a function after stepping into it (for "next" or if
|
||
the called function has no debugging information).
|
||
|
||
The current function has almost always been reached by single
|
||
stepping a call or return instruction. NEXT_FRAME belongs to the
|
||
current function, and the breakpoint will be set at the caller's
|
||
resume address.
|
||
|
||
This is a separate function rather than reusing
|
||
insert_hp_step_resume_breakpoint_at_frame in order to avoid
|
||
get_prev_frame, which may stop prematurely (see the implementation
|
||
of frame_unwind_caller_id for an example). */
|
||
|
||
static void
|
||
insert_step_resume_breakpoint_at_caller (struct frame_info *next_frame)
|
||
{
|
||
/* We shouldn't have gotten here if we don't know where the call site
|
||
is. */
|
||
gdb_assert (frame_id_p (frame_unwind_caller_id (next_frame)));
|
||
|
||
struct gdbarch *gdbarch = frame_unwind_caller_arch (next_frame);
|
||
|
||
symtab_and_line sr_sal;
|
||
sr_sal.pc = gdbarch_addr_bits_remove (gdbarch,
|
||
frame_unwind_caller_pc (next_frame));
|
||
sr_sal.section = find_pc_overlay (sr_sal.pc);
|
||
sr_sal.pspace = frame_unwind_program_space (next_frame);
|
||
|
||
insert_step_resume_breakpoint_at_sal (gdbarch, sr_sal,
|
||
frame_unwind_caller_id (next_frame));
|
||
}
|
||
|
||
/* Insert a "longjmp-resume" breakpoint at PC. This is used to set a
|
||
new breakpoint at the target of a jmp_buf. The handling of
|
||
longjmp-resume uses the same mechanisms used for handling
|
||
"step-resume" breakpoints. */
|
||
|
||
static void
|
||
insert_longjmp_resume_breakpoint (struct gdbarch *gdbarch, CORE_ADDR pc)
|
||
{
|
||
/* There should never be more than one longjmp-resume breakpoint per
|
||
thread, so we should never be setting a new
|
||
longjmp_resume_breakpoint when one is already active. */
|
||
gdb_assert (inferior_thread ()->control.exception_resume_breakpoint == NULL);
|
||
|
||
infrun_debug_printf ("inserting longjmp-resume breakpoint at %s",
|
||
paddress (gdbarch, pc));
|
||
|
||
inferior_thread ()->control.exception_resume_breakpoint =
|
||
set_momentary_breakpoint_at_pc (gdbarch, pc, bp_longjmp_resume).release ();
|
||
}
|
||
|
||
/* Insert an exception resume breakpoint. TP is the thread throwing
|
||
the exception. The block B is the block of the unwinder debug hook
|
||
function. FRAME is the frame corresponding to the call to this
|
||
function. SYM is the symbol of the function argument holding the
|
||
target PC of the exception. */
|
||
|
||
static void
|
||
insert_exception_resume_breakpoint (struct thread_info *tp,
|
||
const struct block *b,
|
||
struct frame_info *frame,
|
||
struct symbol *sym)
|
||
{
|
||
try
|
||
{
|
||
struct block_symbol vsym;
|
||
struct value *value;
|
||
CORE_ADDR handler;
|
||
struct breakpoint *bp;
|
||
|
||
vsym = lookup_symbol_search_name (sym->search_name (),
|
||
b, VAR_DOMAIN);
|
||
value = read_var_value (vsym.symbol, vsym.block, frame);
|
||
/* If the value was optimized out, revert to the old behavior. */
|
||
if (! value_optimized_out (value))
|
||
{
|
||
handler = value_as_address (value);
|
||
|
||
infrun_debug_printf ("exception resume at %lx",
|
||
(unsigned long) handler);
|
||
|
||
bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame),
|
||
handler,
|
||
bp_exception_resume).release ();
|
||
|
||
/* set_momentary_breakpoint_at_pc invalidates FRAME. */
|
||
frame = NULL;
|
||
|
||
bp->thread = tp->global_num;
|
||
inferior_thread ()->control.exception_resume_breakpoint = bp;
|
||
}
|
||
}
|
||
catch (const gdb_exception_error &e)
|
||
{
|
||
/* We want to ignore errors here. */
|
||
}
|
||
}
|
||
|
||
/* A helper for check_exception_resume that sets an
|
||
exception-breakpoint based on a SystemTap probe. */
|
||
|
||
static void
|
||
insert_exception_resume_from_probe (struct thread_info *tp,
|
||
const struct bound_probe *probe,
|
||
struct frame_info *frame)
|
||
{
|
||
struct value *arg_value;
|
||
CORE_ADDR handler;
|
||
struct breakpoint *bp;
|
||
|
||
arg_value = probe_safe_evaluate_at_pc (frame, 1);
|
||
if (!arg_value)
|
||
return;
|
||
|
||
handler = value_as_address (arg_value);
|
||
|
||
infrun_debug_printf ("exception resume at %s",
|
||
paddress (probe->objfile->arch (), handler));
|
||
|
||
bp = set_momentary_breakpoint_at_pc (get_frame_arch (frame),
|
||
handler, bp_exception_resume).release ();
|
||
bp->thread = tp->global_num;
|
||
inferior_thread ()->control.exception_resume_breakpoint = bp;
|
||
}
|
||
|
||
/* This is called when an exception has been intercepted. Check to
|
||
see whether the exception's destination is of interest, and if so,
|
||
set an exception resume breakpoint there. */
|
||
|
||
static void
|
||
check_exception_resume (struct execution_control_state *ecs,
|
||
struct frame_info *frame)
|
||
{
|
||
struct bound_probe probe;
|
||
struct symbol *func;
|
||
|
||
/* First see if this exception unwinding breakpoint was set via a
|
||
SystemTap probe point. If so, the probe has two arguments: the
|
||
CFA and the HANDLER. We ignore the CFA, extract the handler, and
|
||
set a breakpoint there. */
|
||
probe = find_probe_by_pc (get_frame_pc (frame));
|
||
if (probe.prob)
|
||
{
|
||
insert_exception_resume_from_probe (ecs->event_thread, &probe, frame);
|
||
return;
|
||
}
|
||
|
||
func = get_frame_function (frame);
|
||
if (!func)
|
||
return;
|
||
|
||
try
|
||
{
|
||
const struct block *b;
|
||
struct block_iterator iter;
|
||
struct symbol *sym;
|
||
int argno = 0;
|
||
|
||
/* The exception breakpoint is a thread-specific breakpoint on
|
||
the unwinder's debug hook, declared as:
|
||
|
||
void _Unwind_DebugHook (void *cfa, void *handler);
|
||
|
||
The CFA argument indicates the frame to which control is
|
||
about to be transferred. HANDLER is the destination PC.
|
||
|
||
We ignore the CFA and set a temporary breakpoint at HANDLER.
|
||
This is not extremely efficient but it avoids issues in gdb
|
||
with computing the DWARF CFA, and it also works even in weird
|
||
cases such as throwing an exception from inside a signal
|
||
handler. */
|
||
|
||
b = func->value_block ();
|
||
ALL_BLOCK_SYMBOLS (b, iter, sym)
|
||
{
|
||
if (!sym->is_argument ())
|
||
continue;
|
||
|
||
if (argno == 0)
|
||
++argno;
|
||
else
|
||
{
|
||
insert_exception_resume_breakpoint (ecs->event_thread,
|
||
b, frame, sym);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
catch (const gdb_exception_error &e)
|
||
{
|
||
}
|
||
}
|
||
|
||
static void
|
||
stop_waiting (struct execution_control_state *ecs)
|
||
{
|
||
infrun_debug_printf ("stop_waiting");
|
||
|
||
/* Let callers know we don't want to wait for the inferior anymore. */
|
||
ecs->wait_some_more = 0;
|
||
|
||
/* If all-stop, but there exists a non-stop target, stop all
|
||
threads now that we're presenting the stop to the user. */
|
||
if (!non_stop && exists_non_stop_target ())
|
||
stop_all_threads ("presenting stop to user in all-stop");
|
||
}
|
||
|
||
/* Like keep_going, but passes the signal to the inferior, even if the
|
||
signal is set to nopass. */
|
||
|
||
static void
|
||
keep_going_pass_signal (struct execution_control_state *ecs)
|
||
{
|
||
gdb_assert (ecs->event_thread->ptid == inferior_ptid);
|
||
gdb_assert (!ecs->event_thread->resumed ());
|
||
|
||
/* Save the pc before execution, to compare with pc after stop. */
|
||
ecs->event_thread->prev_pc
|
||
= regcache_read_pc_protected (get_thread_regcache (ecs->event_thread));
|
||
|
||
if (ecs->event_thread->control.trap_expected)
|
||
{
|
||
struct thread_info *tp = ecs->event_thread;
|
||
|
||
infrun_debug_printf ("%s has trap_expected set, "
|
||
"resuming to collect trap",
|
||
tp->ptid.to_string ().c_str ());
|
||
|
||
/* We haven't yet gotten our trap, and either: intercepted a
|
||
non-signal event (e.g., a fork); or took a signal which we
|
||
are supposed to pass through to the inferior. Simply
|
||
continue. */
|
||
resume (ecs->event_thread->stop_signal ());
|
||
}
|
||
else if (step_over_info_valid_p ())
|
||
{
|
||
/* Another thread is stepping over a breakpoint in-line. If
|
||
this thread needs a step-over too, queue the request. In
|
||
either case, this resume must be deferred for later. */
|
||
struct thread_info *tp = ecs->event_thread;
|
||
|
||
if (ecs->hit_singlestep_breakpoint
|
||
|| thread_still_needs_step_over (tp))
|
||
{
|
||
infrun_debug_printf ("step-over already in progress: "
|
||
"step-over for %s deferred",
|
||
tp->ptid.to_string ().c_str ());
|
||
global_thread_step_over_chain_enqueue (tp);
|
||
}
|
||
else
|
||
infrun_debug_printf ("step-over in progress: resume of %s deferred",
|
||
tp->ptid.to_string ().c_str ());
|
||
}
|
||
else
|
||
{
|
||
struct regcache *regcache = get_current_regcache ();
|
||
int remove_bp;
|
||
int remove_wps;
|
||
step_over_what step_what;
|
||
|
||
/* Either the trap was not expected, but we are continuing
|
||
anyway (if we got a signal, the user asked it be passed to
|
||
the child)
|
||
-- or --
|
||
We got our expected trap, but decided we should resume from
|
||
it.
|
||
|
||
We're going to run this baby now!
|
||
|
||
Note that insert_breakpoints won't try to re-insert
|
||
already inserted breakpoints. Therefore, we don't
|
||
care if breakpoints were already inserted, or not. */
|
||
|
||
/* If we need to step over a breakpoint, and we're not using
|
||
displaced stepping to do so, insert all breakpoints
|
||
(watchpoints, etc.) but the one we're stepping over, step one
|
||
instruction, and then re-insert the breakpoint when that step
|
||
is finished. */
|
||
|
||
step_what = thread_still_needs_step_over (ecs->event_thread);
|
||
|
||
remove_bp = (ecs->hit_singlestep_breakpoint
|
||
|| (step_what & STEP_OVER_BREAKPOINT));
|
||
remove_wps = (step_what & STEP_OVER_WATCHPOINT);
|
||
|
||
/* We can't use displaced stepping if we need to step past a
|
||
watchpoint. The instruction copied to the scratch pad would
|
||
still trigger the watchpoint. */
|
||
if (remove_bp
|
||
&& (remove_wps || !use_displaced_stepping (ecs->event_thread)))
|
||
{
|
||
set_step_over_info (regcache->aspace (),
|
||
regcache_read_pc (regcache), remove_wps,
|
||
ecs->event_thread->global_num);
|
||
}
|
||
else if (remove_wps)
|
||
set_step_over_info (NULL, 0, remove_wps, -1);
|
||
|
||
/* If we now need to do an in-line step-over, we need to stop
|
||
all other threads. Note this must be done before
|
||
insert_breakpoints below, because that removes the breakpoint
|
||
we're about to step over, otherwise other threads could miss
|
||
it. */
|
||
if (step_over_info_valid_p () && target_is_non_stop_p ())
|
||
stop_all_threads ("starting in-line step-over");
|
||
|
||
/* Stop stepping if inserting breakpoints fails. */
|
||
try
|
||
{
|
||
insert_breakpoints ();
|
||
}
|
||
catch (const gdb_exception_error &e)
|
||
{
|
||
exception_print (gdb_stderr, e);
|
||
stop_waiting (ecs);
|
||
clear_step_over_info ();
|
||
return;
|
||
}
|
||
|
||
ecs->event_thread->control.trap_expected = (remove_bp || remove_wps);
|
||
|
||
resume (ecs->event_thread->stop_signal ());
|
||
}
|
||
|
||
prepare_to_wait (ecs);
|
||
}
|
||
|
||
/* Called when we should continue running the inferior, because the
|
||
current event doesn't cause a user visible stop. This does the
|
||
resuming part; waiting for the next event is done elsewhere. */
|
||
|
||
static void
|
||
keep_going (struct execution_control_state *ecs)
|
||
{
|
||
if (ecs->event_thread->control.trap_expected
|
||
&& ecs->event_thread->stop_signal () == GDB_SIGNAL_TRAP)
|
||
ecs->event_thread->control.trap_expected = 0;
|
||
|
||
if (!signal_program[ecs->event_thread->stop_signal ()])
|
||
ecs->event_thread->set_stop_signal (GDB_SIGNAL_0);
|
||
keep_going_pass_signal (ecs);
|
||
}
|
||
|
||
/* This function normally comes after a resume, before
|
||
handle_inferior_event exits. It takes care of any last bits of
|
||
housekeeping, and sets the all-important wait_some_more flag. */
|
||
|
||
static void
|
||
prepare_to_wait (struct execution_control_state *ecs)
|
||
{
|
||
infrun_debug_printf ("prepare_to_wait");
|
||
|
||
ecs->wait_some_more = 1;
|
||
|
||
/* If the target can't async, emulate it by marking the infrun event
|
||
handler such that as soon as we get back to the event-loop, we
|
||
immediately end up in fetch_inferior_event again calling
|
||
target_wait. */
|
||
if (!target_can_async_p ())
|
||
mark_infrun_async_event_handler ();
|
||
}
|
||
|
||
/* We are done with the step range of a step/next/si/ni command.
|
||
Called once for each n of a "step n" operation. */
|
||
|
||
static void
|
||
end_stepping_range (struct execution_control_state *ecs)
|
||
{
|
||
ecs->event_thread->control.stop_step = 1;
|
||
stop_waiting (ecs);
|
||
}
|
||
|
||
/* Several print_*_reason functions to print why the inferior has stopped.
|
||
We always print something when the inferior exits, or receives a signal.
|
||
The rest of the cases are dealt with later on in normal_stop and
|
||
print_it_typical. Ideally there should be a call to one of these
|
||
print_*_reason functions functions from handle_inferior_event each time
|
||
stop_waiting is called.
|
||
|
||
Note that we don't call these directly, instead we delegate that to
|
||
the interpreters, through observers. Interpreters then call these
|
||
with whatever uiout is right. */
|
||
|
||
void
|
||
print_end_stepping_range_reason (struct ui_out *uiout)
|
||
{
|
||
/* For CLI-like interpreters, print nothing. */
|
||
|
||
if (uiout->is_mi_like_p ())
|
||
{
|
||
uiout->field_string ("reason",
|
||
async_reason_lookup (EXEC_ASYNC_END_STEPPING_RANGE));
|
||
}
|
||
}
|
||
|
||
void
|
||
print_signal_exited_reason (struct ui_out *uiout, enum gdb_signal siggnal)
|
||
{
|
||
annotate_signalled ();
|
||
if (uiout->is_mi_like_p ())
|
||
uiout->field_string
|
||
("reason", async_reason_lookup (EXEC_ASYNC_EXITED_SIGNALLED));
|
||
uiout->text ("\nProgram terminated with signal ");
|
||
annotate_signal_name ();
|
||
uiout->field_string ("signal-name",
|
||
gdb_signal_to_name (siggnal));
|
||
annotate_signal_name_end ();
|
||
uiout->text (", ");
|
||
annotate_signal_string ();
|
||
uiout->field_string ("signal-meaning",
|
||
gdb_signal_to_string (siggnal));
|
||
annotate_signal_string_end ();
|
||
uiout->text (".\n");
|
||
uiout->text ("The program no longer exists.\n");
|
||
}
|
||
|
||
void
|
||
print_exited_reason (struct ui_out *uiout, int exitstatus)
|
||
{
|
||
struct inferior *inf = current_inferior ();
|
||
std::string pidstr = target_pid_to_str (ptid_t (inf->pid));
|
||
|
||
annotate_exited (exitstatus);
|
||
if (exitstatus)
|
||
{
|
||
if (uiout->is_mi_like_p ())
|
||
uiout->field_string ("reason", async_reason_lookup (EXEC_ASYNC_EXITED));
|
||
std::string exit_code_str
|
||
= string_printf ("0%o", (unsigned int) exitstatus);
|
||
uiout->message ("[Inferior %s (%s) exited with code %pF]\n",
|
||
plongest (inf->num), pidstr.c_str (),
|
||
string_field ("exit-code", exit_code_str.c_str ()));
|
||
}
|
||
else
|
||
{
|
||
if (uiout->is_mi_like_p ())
|
||
uiout->field_string
|
||
("reason", async_reason_lookup (EXEC_ASYNC_EXITED_NORMALLY));
|
||
uiout->message ("[Inferior %s (%s) exited normally]\n",
|
||
plongest (inf->num), pidstr.c_str ());
|
||
}
|
||
}
|
||
|
||
void
|
||
print_signal_received_reason (struct ui_out *uiout, enum gdb_signal siggnal)
|
||
{
|
||
struct thread_info *thr = inferior_thread ();
|
||
|
||
annotate_signal ();
|
||
|
||
if (uiout->is_mi_like_p ())
|
||
;
|
||
else if (show_thread_that_caused_stop ())
|
||
{
|
||
uiout->text ("\nThread ");
|
||
uiout->field_string ("thread-id", print_thread_id (thr));
|
||
|
||
const char *name = thread_name (thr);
|
||
if (name != NULL)
|
||
{
|
||
uiout->text (" \"");
|
||
uiout->field_string ("name", name);
|
||
uiout->text ("\"");
|
||
}
|
||
}
|
||
else
|
||
uiout->text ("\nProgram");
|
||
|
||
if (siggnal == GDB_SIGNAL_0 && !uiout->is_mi_like_p ())
|
||
uiout->text (" stopped");
|
||
else
|
||
{
|
||
uiout->text (" received signal ");
|
||
annotate_signal_name ();
|
||
if (uiout->is_mi_like_p ())
|
||
uiout->field_string
|
||
("reason", async_reason_lookup (EXEC_ASYNC_SIGNAL_RECEIVED));
|
||
uiout->field_string ("signal-name", gdb_signal_to_name (siggnal));
|
||
annotate_signal_name_end ();
|
||
uiout->text (", ");
|
||
annotate_signal_string ();
|
||
uiout->field_string ("signal-meaning", gdb_signal_to_string (siggnal));
|
||
|
||
struct regcache *regcache = get_current_regcache ();
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
if (gdbarch_report_signal_info_p (gdbarch))
|
||
gdbarch_report_signal_info (gdbarch, uiout, siggnal);
|
||
|
||
annotate_signal_string_end ();
|
||
}
|
||
uiout->text (".\n");
|
||
}
|
||
|
||
void
|
||
print_no_history_reason (struct ui_out *uiout)
|
||
{
|
||
uiout->text ("\nNo more reverse-execution history.\n");
|
||
}
|
||
|
||
/* Print current location without a level number, if we have changed
|
||
functions or hit a breakpoint. Print source line if we have one.
|
||
bpstat_print contains the logic deciding in detail what to print,
|
||
based on the event(s) that just occurred. */
|
||
|
||
static void
|
||
print_stop_location (const target_waitstatus &ws)
|
||
{
|
||
int bpstat_ret;
|
||
enum print_what source_flag;
|
||
int do_frame_printing = 1;
|
||
struct thread_info *tp = inferior_thread ();
|
||
|
||
bpstat_ret = bpstat_print (tp->control.stop_bpstat, ws.kind ());
|
||
switch (bpstat_ret)
|
||
{
|
||
case PRINT_UNKNOWN:
|
||
/* FIXME: cagney/2002-12-01: Given that a frame ID does (or
|
||
should) carry around the function and does (or should) use
|
||
that when doing a frame comparison. */
|
||
if (tp->control.stop_step
|
||
&& frame_id_eq (tp->control.step_frame_id,
|
||
get_frame_id (get_current_frame ()))
|
||
&& (tp->control.step_start_function
|
||
== find_pc_function (tp->stop_pc ())))
|
||
{
|
||
/* Finished step, just print source line. */
|
||
source_flag = SRC_LINE;
|
||
}
|
||
else
|
||
{
|
||
/* Print location and source line. */
|
||
source_flag = SRC_AND_LOC;
|
||
}
|
||
break;
|
||
case PRINT_SRC_AND_LOC:
|
||
/* Print location and source line. */
|
||
source_flag = SRC_AND_LOC;
|
||
break;
|
||
case PRINT_SRC_ONLY:
|
||
source_flag = SRC_LINE;
|
||
break;
|
||
case PRINT_NOTHING:
|
||
/* Something bogus. */
|
||
source_flag = SRC_LINE;
|
||
do_frame_printing = 0;
|
||
break;
|
||
default:
|
||
internal_error (__FILE__, __LINE__, _("Unknown value."));
|
||
}
|
||
|
||
/* The behavior of this routine with respect to the source
|
||
flag is:
|
||
SRC_LINE: Print only source line
|
||
LOCATION: Print only location
|
||
SRC_AND_LOC: Print location and source line. */
|
||
if (do_frame_printing)
|
||
print_stack_frame (get_selected_frame (NULL), 0, source_flag, 1);
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
print_stop_event (struct ui_out *uiout, bool displays)
|
||
{
|
||
struct target_waitstatus last;
|
||
struct thread_info *tp;
|
||
|
||
get_last_target_status (nullptr, nullptr, &last);
|
||
|
||
{
|
||
scoped_restore save_uiout = make_scoped_restore (¤t_uiout, uiout);
|
||
|
||
print_stop_location (last);
|
||
|
||
/* Display the auto-display expressions. */
|
||
if (displays)
|
||
do_displays ();
|
||
}
|
||
|
||
tp = inferior_thread ();
|
||
if (tp->thread_fsm () != nullptr
|
||
&& tp->thread_fsm ()->finished_p ())
|
||
{
|
||
struct return_value_info *rv;
|
||
|
||
rv = tp->thread_fsm ()->return_value ();
|
||
if (rv != nullptr)
|
||
print_return_value (uiout, rv);
|
||
}
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
maybe_remove_breakpoints (void)
|
||
{
|
||
if (!breakpoints_should_be_inserted_now () && target_has_execution ())
|
||
{
|
||
if (remove_breakpoints ())
|
||
{
|
||
target_terminal::ours_for_output ();
|
||
gdb_printf (_("Cannot remove breakpoints because "
|
||
"program is no longer writable.\nFurther "
|
||
"execution is probably impossible.\n"));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* The execution context that just caused a normal stop. */
|
||
|
||
struct stop_context
|
||
{
|
||
stop_context ();
|
||
|
||
DISABLE_COPY_AND_ASSIGN (stop_context);
|
||
|
||
bool changed () const;
|
||
|
||
/* The stop ID. */
|
||
ULONGEST stop_id;
|
||
|
||
/* The event PTID. */
|
||
|
||
ptid_t ptid;
|
||
|
||
/* If stopp for a thread event, this is the thread that caused the
|
||
stop. */
|
||
thread_info_ref thread;
|
||
|
||
/* The inferior that caused the stop. */
|
||
int inf_num;
|
||
};
|
||
|
||
/* Initializes a new stop context. If stopped for a thread event, this
|
||
takes a strong reference to the thread. */
|
||
|
||
stop_context::stop_context ()
|
||
{
|
||
stop_id = get_stop_id ();
|
||
ptid = inferior_ptid;
|
||
inf_num = current_inferior ()->num;
|
||
|
||
if (inferior_ptid != null_ptid)
|
||
{
|
||
/* Take a strong reference so that the thread can't be deleted
|
||
yet. */
|
||
thread = thread_info_ref::new_reference (inferior_thread ());
|
||
}
|
||
}
|
||
|
||
/* Return true if the current context no longer matches the saved stop
|
||
context. */
|
||
|
||
bool
|
||
stop_context::changed () const
|
||
{
|
||
if (ptid != inferior_ptid)
|
||
return true;
|
||
if (inf_num != current_inferior ()->num)
|
||
return true;
|
||
if (thread != NULL && thread->state != THREAD_STOPPED)
|
||
return true;
|
||
if (get_stop_id () != stop_id)
|
||
return true;
|
||
return false;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
int
|
||
normal_stop (void)
|
||
{
|
||
struct target_waitstatus last;
|
||
|
||
get_last_target_status (nullptr, nullptr, &last);
|
||
|
||
new_stop_id ();
|
||
|
||
/* If an exception is thrown from this point on, make sure to
|
||
propagate GDB's knowledge of the executing state to the
|
||
frontend/user running state. A QUIT is an easy exception to see
|
||
here, so do this before any filtered output. */
|
||
|
||
ptid_t finish_ptid = null_ptid;
|
||
|
||
if (!non_stop)
|
||
finish_ptid = minus_one_ptid;
|
||
else if (last.kind () == TARGET_WAITKIND_SIGNALLED
|
||
|| last.kind () == TARGET_WAITKIND_EXITED)
|
||
{
|
||
/* On some targets, we may still have live threads in the
|
||
inferior when we get a process exit event. E.g., for
|
||
"checkpoint", when the current checkpoint/fork exits,
|
||
linux-fork.c automatically switches to another fork from
|
||
within target_mourn_inferior. */
|
||
if (inferior_ptid != null_ptid)
|
||
finish_ptid = ptid_t (inferior_ptid.pid ());
|
||
}
|
||
else if (last.kind () != TARGET_WAITKIND_NO_RESUMED)
|
||
finish_ptid = inferior_ptid;
|
||
|
||
gdb::optional<scoped_finish_thread_state> maybe_finish_thread_state;
|
||
if (finish_ptid != null_ptid)
|
||
{
|
||
maybe_finish_thread_state.emplace
|
||
(user_visible_resume_target (finish_ptid), finish_ptid);
|
||
}
|
||
|
||
/* As we're presenting a stop, and potentially removing breakpoints,
|
||
update the thread list so we can tell whether there are threads
|
||
running on the target. With target remote, for example, we can
|
||
only learn about new threads when we explicitly update the thread
|
||
list. Do this before notifying the interpreters about signal
|
||
stops, end of stepping ranges, etc., so that the "new thread"
|
||
output is emitted before e.g., "Program received signal FOO",
|
||
instead of after. */
|
||
update_thread_list ();
|
||
|
||
if (last.kind () == TARGET_WAITKIND_STOPPED && stopped_by_random_signal)
|
||
gdb::observers::signal_received.notify (inferior_thread ()->stop_signal ());
|
||
|
||
/* As with the notification of thread events, we want to delay
|
||
notifying the user that we've switched thread context until
|
||
the inferior actually stops.
|
||
|
||
There's no point in saying anything if the inferior has exited.
|
||
Note that SIGNALLED here means "exited with a signal", not
|
||
"received a signal".
|
||
|
||
Also skip saying anything in non-stop mode. In that mode, as we
|
||
don't want GDB to switch threads behind the user's back, to avoid
|
||
races where the user is typing a command to apply to thread x,
|
||
but GDB switches to thread y before the user finishes entering
|
||
the command, fetch_inferior_event installs a cleanup to restore
|
||
the current thread back to the thread the user had selected right
|
||
after this event is handled, so we're not really switching, only
|
||
informing of a stop. */
|
||
if (!non_stop
|
||
&& previous_inferior_ptid != inferior_ptid
|
||
&& target_has_execution ()
|
||
&& last.kind () != TARGET_WAITKIND_SIGNALLED
|
||
&& last.kind () != TARGET_WAITKIND_EXITED
|
||
&& last.kind () != TARGET_WAITKIND_NO_RESUMED)
|
||
{
|
||
SWITCH_THRU_ALL_UIS ()
|
||
{
|
||
target_terminal::ours_for_output ();
|
||
gdb_printf (_("[Switching to %s]\n"),
|
||
target_pid_to_str (inferior_ptid).c_str ());
|
||
annotate_thread_changed ();
|
||
}
|
||
previous_inferior_ptid = inferior_ptid;
|
||
}
|
||
|
||
if (last.kind () == TARGET_WAITKIND_NO_RESUMED)
|
||
{
|
||
SWITCH_THRU_ALL_UIS ()
|
||
if (current_ui->prompt_state == PROMPT_BLOCKED)
|
||
{
|
||
target_terminal::ours_for_output ();
|
||
gdb_printf (_("No unwaited-for children left.\n"));
|
||
}
|
||
}
|
||
|
||
/* Note: this depends on the update_thread_list call above. */
|
||
maybe_remove_breakpoints ();
|
||
|
||
/* If an auto-display called a function and that got a signal,
|
||
delete that auto-display to avoid an infinite recursion. */
|
||
|
||
if (stopped_by_random_signal)
|
||
disable_current_display ();
|
||
|
||
SWITCH_THRU_ALL_UIS ()
|
||
{
|
||
async_enable_stdin ();
|
||
}
|
||
|
||
/* Let the user/frontend see the threads as stopped. */
|
||
maybe_finish_thread_state.reset ();
|
||
|
||
/* Select innermost stack frame - i.e., current frame is frame 0,
|
||
and current location is based on that. Handle the case where the
|
||
dummy call is returning after being stopped. E.g. the dummy call
|
||
previously hit a breakpoint. (If the dummy call returns
|
||
normally, we won't reach here.) Do this before the stop hook is
|
||
run, so that it doesn't get to see the temporary dummy frame,
|
||
which is not where we'll present the stop. */
|
||
if (has_stack_frames ())
|
||
{
|
||
if (stop_stack_dummy == STOP_STACK_DUMMY)
|
||
{
|
||
/* Pop the empty frame that contains the stack dummy. This
|
||
also restores inferior state prior to the call (struct
|
||
infcall_suspend_state). */
|
||
struct frame_info *frame = get_current_frame ();
|
||
|
||
gdb_assert (get_frame_type (frame) == DUMMY_FRAME);
|
||
frame_pop (frame);
|
||
/* frame_pop calls reinit_frame_cache as the last thing it
|
||
does which means there's now no selected frame. */
|
||
}
|
||
|
||
select_frame (get_current_frame ());
|
||
|
||
/* Set the current source location. */
|
||
set_current_sal_from_frame (get_current_frame ());
|
||
}
|
||
|
||
/* Look up the hook_stop and run it (CLI internally handles problem
|
||
of stop_command's pre-hook not existing). */
|
||
stop_context saved_context;
|
||
|
||
try
|
||
{
|
||
execute_cmd_pre_hook (stop_command);
|
||
}
|
||
catch (const gdb_exception &ex)
|
||
{
|
||
exception_fprintf (gdb_stderr, ex,
|
||
"Error while running hook_stop:\n");
|
||
}
|
||
|
||
/* If the stop hook resumes the target, then there's no point in
|
||
trying to notify about the previous stop; its context is
|
||
gone. Likewise if the command switches thread or inferior --
|
||
the observers would print a stop for the wrong
|
||
thread/inferior. */
|
||
if (saved_context.changed ())
|
||
return 1;
|
||
|
||
/* Notify observers about the stop. This is where the interpreters
|
||
print the stop event. */
|
||
if (inferior_ptid != null_ptid)
|
||
gdb::observers::normal_stop.notify (inferior_thread ()->control.stop_bpstat,
|
||
stop_print_frame);
|
||
else
|
||
gdb::observers::normal_stop.notify (NULL, stop_print_frame);
|
||
|
||
annotate_stopped ();
|
||
|
||
if (target_has_execution ())
|
||
{
|
||
if (last.kind () != TARGET_WAITKIND_SIGNALLED
|
||
&& last.kind () != TARGET_WAITKIND_EXITED
|
||
&& last.kind () != TARGET_WAITKIND_NO_RESUMED)
|
||
/* Delete the breakpoint we stopped at, if it wants to be deleted.
|
||
Delete any breakpoint that is to be deleted at the next stop. */
|
||
breakpoint_auto_delete (inferior_thread ()->control.stop_bpstat);
|
||
}
|
||
|
||
/* Try to get rid of automatically added inferiors that are no
|
||
longer needed. Keeping those around slows down things linearly.
|
||
Note that this never removes the current inferior. */
|
||
prune_inferiors ();
|
||
|
||
return 0;
|
||
}
|
||
|
||
int
|
||
signal_stop_state (int signo)
|
||
{
|
||
return signal_stop[signo];
|
||
}
|
||
|
||
int
|
||
signal_print_state (int signo)
|
||
{
|
||
return signal_print[signo];
|
||
}
|
||
|
||
int
|
||
signal_pass_state (int signo)
|
||
{
|
||
return signal_program[signo];
|
||
}
|
||
|
||
static void
|
||
signal_cache_update (int signo)
|
||
{
|
||
if (signo == -1)
|
||
{
|
||
for (signo = 0; signo < (int) GDB_SIGNAL_LAST; signo++)
|
||
signal_cache_update (signo);
|
||
|
||
return;
|
||
}
|
||
|
||
signal_pass[signo] = (signal_stop[signo] == 0
|
||
&& signal_print[signo] == 0
|
||
&& signal_program[signo] == 1
|
||
&& signal_catch[signo] == 0);
|
||
}
|
||
|
||
int
|
||
signal_stop_update (int signo, int state)
|
||
{
|
||
int ret = signal_stop[signo];
|
||
|
||
signal_stop[signo] = state;
|
||
signal_cache_update (signo);
|
||
return ret;
|
||
}
|
||
|
||
int
|
||
signal_print_update (int signo, int state)
|
||
{
|
||
int ret = signal_print[signo];
|
||
|
||
signal_print[signo] = state;
|
||
signal_cache_update (signo);
|
||
return ret;
|
||
}
|
||
|
||
int
|
||
signal_pass_update (int signo, int state)
|
||
{
|
||
int ret = signal_program[signo];
|
||
|
||
signal_program[signo] = state;
|
||
signal_cache_update (signo);
|
||
return ret;
|
||
}
|
||
|
||
/* Update the global 'signal_catch' from INFO and notify the
|
||
target. */
|
||
|
||
void
|
||
signal_catch_update (const unsigned int *info)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; i < GDB_SIGNAL_LAST; ++i)
|
||
signal_catch[i] = info[i] > 0;
|
||
signal_cache_update (-1);
|
||
target_pass_signals (signal_pass);
|
||
}
|
||
|
||
static void
|
||
sig_print_header (void)
|
||
{
|
||
gdb_printf (_("Signal Stop\tPrint\tPass "
|
||
"to program\tDescription\n"));
|
||
}
|
||
|
||
static void
|
||
sig_print_info (enum gdb_signal oursig)
|
||
{
|
||
const char *name = gdb_signal_to_name (oursig);
|
||
int name_padding = 13 - strlen (name);
|
||
|
||
if (name_padding <= 0)
|
||
name_padding = 0;
|
||
|
||
gdb_printf ("%s", name);
|
||
gdb_printf ("%*.*s ", name_padding, name_padding, " ");
|
||
gdb_printf ("%s\t", signal_stop[oursig] ? "Yes" : "No");
|
||
gdb_printf ("%s\t", signal_print[oursig] ? "Yes" : "No");
|
||
gdb_printf ("%s\t\t", signal_program[oursig] ? "Yes" : "No");
|
||
gdb_printf ("%s\n", gdb_signal_to_string (oursig));
|
||
}
|
||
|
||
/* Specify how various signals in the inferior should be handled. */
|
||
|
||
static void
|
||
handle_command (const char *args, int from_tty)
|
||
{
|
||
int digits, wordlen;
|
||
int sigfirst, siglast;
|
||
enum gdb_signal oursig;
|
||
int allsigs;
|
||
|
||
if (args == NULL)
|
||
{
|
||
error_no_arg (_("signal to handle"));
|
||
}
|
||
|
||
/* Allocate and zero an array of flags for which signals to handle. */
|
||
|
||
const size_t nsigs = GDB_SIGNAL_LAST;
|
||
unsigned char sigs[nsigs] {};
|
||
|
||
/* Break the command line up into args. */
|
||
|
||
gdb_argv built_argv (args);
|
||
|
||
/* Walk through the args, looking for signal oursigs, signal names, and
|
||
actions. Signal numbers and signal names may be interspersed with
|
||
actions, with the actions being performed for all signals cumulatively
|
||
specified. Signal ranges can be specified as <LOW>-<HIGH>. */
|
||
|
||
for (char *arg : built_argv)
|
||
{
|
||
wordlen = strlen (arg);
|
||
for (digits = 0; isdigit (arg[digits]); digits++)
|
||
{;
|
||
}
|
||
allsigs = 0;
|
||
sigfirst = siglast = -1;
|
||
|
||
if (wordlen >= 1 && !strncmp (arg, "all", wordlen))
|
||
{
|
||
/* Apply action to all signals except those used by the
|
||
debugger. Silently skip those. */
|
||
allsigs = 1;
|
||
sigfirst = 0;
|
||
siglast = nsigs - 1;
|
||
}
|
||
else if (wordlen >= 1 && !strncmp (arg, "stop", wordlen))
|
||
{
|
||
SET_SIGS (nsigs, sigs, signal_stop);
|
||
SET_SIGS (nsigs, sigs, signal_print);
|
||
}
|
||
else if (wordlen >= 1 && !strncmp (arg, "ignore", wordlen))
|
||
{
|
||
UNSET_SIGS (nsigs, sigs, signal_program);
|
||
}
|
||
else if (wordlen >= 2 && !strncmp (arg, "print", wordlen))
|
||
{
|
||
SET_SIGS (nsigs, sigs, signal_print);
|
||
}
|
||
else if (wordlen >= 2 && !strncmp (arg, "pass", wordlen))
|
||
{
|
||
SET_SIGS (nsigs, sigs, signal_program);
|
||
}
|
||
else if (wordlen >= 3 && !strncmp (arg, "nostop", wordlen))
|
||
{
|
||
UNSET_SIGS (nsigs, sigs, signal_stop);
|
||
}
|
||
else if (wordlen >= 3 && !strncmp (arg, "noignore", wordlen))
|
||
{
|
||
SET_SIGS (nsigs, sigs, signal_program);
|
||
}
|
||
else if (wordlen >= 4 && !strncmp (arg, "noprint", wordlen))
|
||
{
|
||
UNSET_SIGS (nsigs, sigs, signal_print);
|
||
UNSET_SIGS (nsigs, sigs, signal_stop);
|
||
}
|
||
else if (wordlen >= 4 && !strncmp (arg, "nopass", wordlen))
|
||
{
|
||
UNSET_SIGS (nsigs, sigs, signal_program);
|
||
}
|
||
else if (digits > 0)
|
||
{
|
||
/* It is numeric. The numeric signal refers to our own
|
||
internal signal numbering from target.h, not to host/target
|
||
signal number. This is a feature; users really should be
|
||
using symbolic names anyway, and the common ones like
|
||
SIGHUP, SIGINT, SIGALRM, etc. will work right anyway. */
|
||
|
||
sigfirst = siglast = (int)
|
||
gdb_signal_from_command (atoi (arg));
|
||
if (arg[digits] == '-')
|
||
{
|
||
siglast = (int)
|
||
gdb_signal_from_command (atoi (arg + digits + 1));
|
||
}
|
||
if (sigfirst > siglast)
|
||
{
|
||
/* Bet he didn't figure we'd think of this case... */
|
||
std::swap (sigfirst, siglast);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
oursig = gdb_signal_from_name (arg);
|
||
if (oursig != GDB_SIGNAL_UNKNOWN)
|
||
{
|
||
sigfirst = siglast = (int) oursig;
|
||
}
|
||
else
|
||
{
|
||
/* Not a number and not a recognized flag word => complain. */
|
||
error (_("Unrecognized or ambiguous flag word: \"%s\"."), arg);
|
||
}
|
||
}
|
||
|
||
/* If any signal numbers or symbol names were found, set flags for
|
||
which signals to apply actions to. */
|
||
|
||
for (int signum = sigfirst; signum >= 0 && signum <= siglast; signum++)
|
||
{
|
||
switch ((enum gdb_signal) signum)
|
||
{
|
||
case GDB_SIGNAL_TRAP:
|
||
case GDB_SIGNAL_INT:
|
||
if (!allsigs && !sigs[signum])
|
||
{
|
||
if (query (_("%s is used by the debugger.\n\
|
||
Are you sure you want to change it? "),
|
||
gdb_signal_to_name ((enum gdb_signal) signum)))
|
||
{
|
||
sigs[signum] = 1;
|
||
}
|
||
else
|
||
gdb_printf (_("Not confirmed, unchanged.\n"));
|
||
}
|
||
break;
|
||
case GDB_SIGNAL_0:
|
||
case GDB_SIGNAL_DEFAULT:
|
||
case GDB_SIGNAL_UNKNOWN:
|
||
/* Make sure that "all" doesn't print these. */
|
||
break;
|
||
default:
|
||
sigs[signum] = 1;
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
for (int signum = 0; signum < nsigs; signum++)
|
||
if (sigs[signum])
|
||
{
|
||
signal_cache_update (-1);
|
||
target_pass_signals (signal_pass);
|
||
target_program_signals (signal_program);
|
||
|
||
if (from_tty)
|
||
{
|
||
/* Show the results. */
|
||
sig_print_header ();
|
||
for (; signum < nsigs; signum++)
|
||
if (sigs[signum])
|
||
sig_print_info ((enum gdb_signal) signum);
|
||
}
|
||
|
||
break;
|
||
}
|
||
}
|
||
|
||
/* Complete the "handle" command. */
|
||
|
||
static void
|
||
handle_completer (struct cmd_list_element *ignore,
|
||
completion_tracker &tracker,
|
||
const char *text, const char *word)
|
||
{
|
||
static const char * const keywords[] =
|
||
{
|
||
"all",
|
||
"stop",
|
||
"ignore",
|
||
"print",
|
||
"pass",
|
||
"nostop",
|
||
"noignore",
|
||
"noprint",
|
||
"nopass",
|
||
NULL,
|
||
};
|
||
|
||
signal_completer (ignore, tracker, text, word);
|
||
complete_on_enum (tracker, keywords, word, word);
|
||
}
|
||
|
||
enum gdb_signal
|
||
gdb_signal_from_command (int num)
|
||
{
|
||
if (num >= 1 && num <= 15)
|
||
return (enum gdb_signal) num;
|
||
error (_("Only signals 1-15 are valid as numeric signals.\n\
|
||
Use \"info signals\" for a list of symbolic signals."));
|
||
}
|
||
|
||
/* Print current contents of the tables set by the handle command.
|
||
It is possible we should just be printing signals actually used
|
||
by the current target (but for things to work right when switching
|
||
targets, all signals should be in the signal tables). */
|
||
|
||
static void
|
||
info_signals_command (const char *signum_exp, int from_tty)
|
||
{
|
||
enum gdb_signal oursig;
|
||
|
||
sig_print_header ();
|
||
|
||
if (signum_exp)
|
||
{
|
||
/* First see if this is a symbol name. */
|
||
oursig = gdb_signal_from_name (signum_exp);
|
||
if (oursig == GDB_SIGNAL_UNKNOWN)
|
||
{
|
||
/* No, try numeric. */
|
||
oursig =
|
||
gdb_signal_from_command (parse_and_eval_long (signum_exp));
|
||
}
|
||
sig_print_info (oursig);
|
||
return;
|
||
}
|
||
|
||
gdb_printf ("\n");
|
||
/* These ugly casts brought to you by the native VAX compiler. */
|
||
for (oursig = GDB_SIGNAL_FIRST;
|
||
(int) oursig < (int) GDB_SIGNAL_LAST;
|
||
oursig = (enum gdb_signal) ((int) oursig + 1))
|
||
{
|
||
QUIT;
|
||
|
||
if (oursig != GDB_SIGNAL_UNKNOWN
|
||
&& oursig != GDB_SIGNAL_DEFAULT && oursig != GDB_SIGNAL_0)
|
||
sig_print_info (oursig);
|
||
}
|
||
|
||
gdb_printf (_("\nUse the \"handle\" command "
|
||
"to change these tables.\n"));
|
||
}
|
||
|
||
/* The $_siginfo convenience variable is a bit special. We don't know
|
||
for sure the type of the value until we actually have a chance to
|
||
fetch the data. The type can change depending on gdbarch, so it is
|
||
also dependent on which thread you have selected.
|
||
|
||
1. making $_siginfo be an internalvar that creates a new value on
|
||
access.
|
||
|
||
2. making the value of $_siginfo be an lval_computed value. */
|
||
|
||
/* This function implements the lval_computed support for reading a
|
||
$_siginfo value. */
|
||
|
||
static void
|
||
siginfo_value_read (struct value *v)
|
||
{
|
||
LONGEST transferred;
|
||
|
||
/* If we can access registers, so can we access $_siginfo. Likewise
|
||
vice versa. */
|
||
validate_registers_access ();
|
||
|
||
transferred =
|
||
target_read (current_inferior ()->top_target (),
|
||
TARGET_OBJECT_SIGNAL_INFO,
|
||
NULL,
|
||
value_contents_all_raw (v).data (),
|
||
value_offset (v),
|
||
TYPE_LENGTH (value_type (v)));
|
||
|
||
if (transferred != TYPE_LENGTH (value_type (v)))
|
||
error (_("Unable to read siginfo"));
|
||
}
|
||
|
||
/* This function implements the lval_computed support for writing a
|
||
$_siginfo value. */
|
||
|
||
static void
|
||
siginfo_value_write (struct value *v, struct value *fromval)
|
||
{
|
||
LONGEST transferred;
|
||
|
||
/* If we can access registers, so can we access $_siginfo. Likewise
|
||
vice versa. */
|
||
validate_registers_access ();
|
||
|
||
transferred = target_write (current_inferior ()->top_target (),
|
||
TARGET_OBJECT_SIGNAL_INFO,
|
||
NULL,
|
||
value_contents_all_raw (fromval).data (),
|
||
value_offset (v),
|
||
TYPE_LENGTH (value_type (fromval)));
|
||
|
||
if (transferred != TYPE_LENGTH (value_type (fromval)))
|
||
error (_("Unable to write siginfo"));
|
||
}
|
||
|
||
static const struct lval_funcs siginfo_value_funcs =
|
||
{
|
||
siginfo_value_read,
|
||
siginfo_value_write
|
||
};
|
||
|
||
/* Return a new value with the correct type for the siginfo object of
|
||
the current thread using architecture GDBARCH. Return a void value
|
||
if there's no object available. */
|
||
|
||
static struct value *
|
||
siginfo_make_value (struct gdbarch *gdbarch, struct internalvar *var,
|
||
void *ignore)
|
||
{
|
||
if (target_has_stack ()
|
||
&& inferior_ptid != null_ptid
|
||
&& gdbarch_get_siginfo_type_p (gdbarch))
|
||
{
|
||
struct type *type = gdbarch_get_siginfo_type (gdbarch);
|
||
|
||
return allocate_computed_value (type, &siginfo_value_funcs, NULL);
|
||
}
|
||
|
||
return allocate_value (builtin_type (gdbarch)->builtin_void);
|
||
}
|
||
|
||
|
||
/* infcall_suspend_state contains state about the program itself like its
|
||
registers and any signal it received when it last stopped.
|
||
This state must be restored regardless of how the inferior function call
|
||
ends (either successfully, or after it hits a breakpoint or signal)
|
||
if the program is to properly continue where it left off. */
|
||
|
||
class infcall_suspend_state
|
||
{
|
||
public:
|
||
/* Capture state from GDBARCH, TP, and REGCACHE that must be restored
|
||
once the inferior function call has finished. */
|
||
infcall_suspend_state (struct gdbarch *gdbarch,
|
||
const struct thread_info *tp,
|
||
struct regcache *regcache)
|
||
: m_registers (new readonly_detached_regcache (*regcache))
|
||
{
|
||
tp->save_suspend_to (m_thread_suspend);
|
||
|
||
gdb::unique_xmalloc_ptr<gdb_byte> siginfo_data;
|
||
|
||
if (gdbarch_get_siginfo_type_p (gdbarch))
|
||
{
|
||
struct type *type = gdbarch_get_siginfo_type (gdbarch);
|
||
size_t len = TYPE_LENGTH (type);
|
||
|
||
siginfo_data.reset ((gdb_byte *) xmalloc (len));
|
||
|
||
if (target_read (current_inferior ()->top_target (),
|
||
TARGET_OBJECT_SIGNAL_INFO, NULL,
|
||
siginfo_data.get (), 0, len) != len)
|
||
{
|
||
/* Errors ignored. */
|
||
siginfo_data.reset (nullptr);
|
||
}
|
||
}
|
||
|
||
if (siginfo_data)
|
||
{
|
||
m_siginfo_gdbarch = gdbarch;
|
||
m_siginfo_data = std::move (siginfo_data);
|
||
}
|
||
}
|
||
|
||
/* Return a pointer to the stored register state. */
|
||
|
||
readonly_detached_regcache *registers () const
|
||
{
|
||
return m_registers.get ();
|
||
}
|
||
|
||
/* Restores the stored state into GDBARCH, TP, and REGCACHE. */
|
||
|
||
void restore (struct gdbarch *gdbarch,
|
||
struct thread_info *tp,
|
||
struct regcache *regcache) const
|
||
{
|
||
tp->restore_suspend_from (m_thread_suspend);
|
||
|
||
if (m_siginfo_gdbarch == gdbarch)
|
||
{
|
||
struct type *type = gdbarch_get_siginfo_type (gdbarch);
|
||
|
||
/* Errors ignored. */
|
||
target_write (current_inferior ()->top_target (),
|
||
TARGET_OBJECT_SIGNAL_INFO, NULL,
|
||
m_siginfo_data.get (), 0, TYPE_LENGTH (type));
|
||
}
|
||
|
||
/* The inferior can be gone if the user types "print exit(0)"
|
||
(and perhaps other times). */
|
||
if (target_has_execution ())
|
||
/* NB: The register write goes through to the target. */
|
||
regcache->restore (registers ());
|
||
}
|
||
|
||
private:
|
||
/* How the current thread stopped before the inferior function call was
|
||
executed. */
|
||
struct thread_suspend_state m_thread_suspend;
|
||
|
||
/* The registers before the inferior function call was executed. */
|
||
std::unique_ptr<readonly_detached_regcache> m_registers;
|
||
|
||
/* Format of SIGINFO_DATA or NULL if it is not present. */
|
||
struct gdbarch *m_siginfo_gdbarch = nullptr;
|
||
|
||
/* The inferior format depends on SIGINFO_GDBARCH and it has a length of
|
||
TYPE_LENGTH (gdbarch_get_siginfo_type ()). For different gdbarch the
|
||
content would be invalid. */
|
||
gdb::unique_xmalloc_ptr<gdb_byte> m_siginfo_data;
|
||
};
|
||
|
||
infcall_suspend_state_up
|
||
save_infcall_suspend_state ()
|
||
{
|
||
struct thread_info *tp = inferior_thread ();
|
||
struct regcache *regcache = get_current_regcache ();
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
|
||
infcall_suspend_state_up inf_state
|
||
(new struct infcall_suspend_state (gdbarch, tp, regcache));
|
||
|
||
/* Having saved the current state, adjust the thread state, discarding
|
||
any stop signal information. The stop signal is not useful when
|
||
starting an inferior function call, and run_inferior_call will not use
|
||
the signal due to its `proceed' call with GDB_SIGNAL_0. */
|
||
tp->set_stop_signal (GDB_SIGNAL_0);
|
||
|
||
return inf_state;
|
||
}
|
||
|
||
/* Restore inferior session state to INF_STATE. */
|
||
|
||
void
|
||
restore_infcall_suspend_state (struct infcall_suspend_state *inf_state)
|
||
{
|
||
struct thread_info *tp = inferior_thread ();
|
||
struct regcache *regcache = get_current_regcache ();
|
||
struct gdbarch *gdbarch = regcache->arch ();
|
||
|
||
inf_state->restore (gdbarch, tp, regcache);
|
||
discard_infcall_suspend_state (inf_state);
|
||
}
|
||
|
||
void
|
||
discard_infcall_suspend_state (struct infcall_suspend_state *inf_state)
|
||
{
|
||
delete inf_state;
|
||
}
|
||
|
||
readonly_detached_regcache *
|
||
get_infcall_suspend_state_regcache (struct infcall_suspend_state *inf_state)
|
||
{
|
||
return inf_state->registers ();
|
||
}
|
||
|
||
/* infcall_control_state contains state regarding gdb's control of the
|
||
inferior itself like stepping control. It also contains session state like
|
||
the user's currently selected frame. */
|
||
|
||
struct infcall_control_state
|
||
{
|
||
struct thread_control_state thread_control;
|
||
struct inferior_control_state inferior_control;
|
||
|
||
/* Other fields: */
|
||
enum stop_stack_kind stop_stack_dummy = STOP_NONE;
|
||
int stopped_by_random_signal = 0;
|
||
|
||
/* ID and level of the selected frame when the inferior function
|
||
call was made. */
|
||
struct frame_id selected_frame_id {};
|
||
int selected_frame_level = -1;
|
||
};
|
||
|
||
/* Save all of the information associated with the inferior<==>gdb
|
||
connection. */
|
||
|
||
infcall_control_state_up
|
||
save_infcall_control_state ()
|
||
{
|
||
infcall_control_state_up inf_status (new struct infcall_control_state);
|
||
struct thread_info *tp = inferior_thread ();
|
||
struct inferior *inf = current_inferior ();
|
||
|
||
inf_status->thread_control = tp->control;
|
||
inf_status->inferior_control = inf->control;
|
||
|
||
tp->control.step_resume_breakpoint = NULL;
|
||
tp->control.exception_resume_breakpoint = NULL;
|
||
|
||
/* Save original bpstat chain to INF_STATUS; replace it in TP with copy of
|
||
chain. If caller's caller is walking the chain, they'll be happier if we
|
||
hand them back the original chain when restore_infcall_control_state is
|
||
called. */
|
||
tp->control.stop_bpstat = bpstat_copy (tp->control.stop_bpstat);
|
||
|
||
/* Other fields: */
|
||
inf_status->stop_stack_dummy = stop_stack_dummy;
|
||
inf_status->stopped_by_random_signal = stopped_by_random_signal;
|
||
|
||
save_selected_frame (&inf_status->selected_frame_id,
|
||
&inf_status->selected_frame_level);
|
||
|
||
return inf_status;
|
||
}
|
||
|
||
/* Restore inferior session state to INF_STATUS. */
|
||
|
||
void
|
||
restore_infcall_control_state (struct infcall_control_state *inf_status)
|
||
{
|
||
struct thread_info *tp = inferior_thread ();
|
||
struct inferior *inf = current_inferior ();
|
||
|
||
if (tp->control.step_resume_breakpoint)
|
||
tp->control.step_resume_breakpoint->disposition = disp_del_at_next_stop;
|
||
|
||
if (tp->control.exception_resume_breakpoint)
|
||
tp->control.exception_resume_breakpoint->disposition
|
||
= disp_del_at_next_stop;
|
||
|
||
/* Handle the bpstat_copy of the chain. */
|
||
bpstat_clear (&tp->control.stop_bpstat);
|
||
|
||
tp->control = inf_status->thread_control;
|
||
inf->control = inf_status->inferior_control;
|
||
|
||
/* Other fields: */
|
||
stop_stack_dummy = inf_status->stop_stack_dummy;
|
||
stopped_by_random_signal = inf_status->stopped_by_random_signal;
|
||
|
||
if (target_has_stack ())
|
||
{
|
||
restore_selected_frame (inf_status->selected_frame_id,
|
||
inf_status->selected_frame_level);
|
||
}
|
||
|
||
delete inf_status;
|
||
}
|
||
|
||
void
|
||
discard_infcall_control_state (struct infcall_control_state *inf_status)
|
||
{
|
||
if (inf_status->thread_control.step_resume_breakpoint)
|
||
inf_status->thread_control.step_resume_breakpoint->disposition
|
||
= disp_del_at_next_stop;
|
||
|
||
if (inf_status->thread_control.exception_resume_breakpoint)
|
||
inf_status->thread_control.exception_resume_breakpoint->disposition
|
||
= disp_del_at_next_stop;
|
||
|
||
/* See save_infcall_control_state for info on stop_bpstat. */
|
||
bpstat_clear (&inf_status->thread_control.stop_bpstat);
|
||
|
||
delete inf_status;
|
||
}
|
||
|
||
/* See infrun.h. */
|
||
|
||
void
|
||
clear_exit_convenience_vars (void)
|
||
{
|
||
clear_internalvar (lookup_internalvar ("_exitsignal"));
|
||
clear_internalvar (lookup_internalvar ("_exitcode"));
|
||
}
|
||
|
||
|
||
/* User interface for reverse debugging:
|
||
Set exec-direction / show exec-direction commands
|
||
(returns error unless target implements to_set_exec_direction method). */
|
||
|
||
enum exec_direction_kind execution_direction = EXEC_FORWARD;
|
||
static const char exec_forward[] = "forward";
|
||
static const char exec_reverse[] = "reverse";
|
||
static const char *exec_direction = exec_forward;
|
||
static const char *const exec_direction_names[] = {
|
||
exec_forward,
|
||
exec_reverse,
|
||
NULL
|
||
};
|
||
|
||
static void
|
||
set_exec_direction_func (const char *args, int from_tty,
|
||
struct cmd_list_element *cmd)
|
||
{
|
||
if (target_can_execute_reverse ())
|
||
{
|
||
if (!strcmp (exec_direction, exec_forward))
|
||
execution_direction = EXEC_FORWARD;
|
||
else if (!strcmp (exec_direction, exec_reverse))
|
||
execution_direction = EXEC_REVERSE;
|
||
}
|
||
else
|
||
{
|
||
exec_direction = exec_forward;
|
||
error (_("Target does not support this operation."));
|
||
}
|
||
}
|
||
|
||
static void
|
||
show_exec_direction_func (struct ui_file *out, int from_tty,
|
||
struct cmd_list_element *cmd, const char *value)
|
||
{
|
||
switch (execution_direction) {
|
||
case EXEC_FORWARD:
|
||
gdb_printf (out, _("Forward.\n"));
|
||
break;
|
||
case EXEC_REVERSE:
|
||
gdb_printf (out, _("Reverse.\n"));
|
||
break;
|
||
default:
|
||
internal_error (__FILE__, __LINE__,
|
||
_("bogus execution_direction value: %d"),
|
||
(int) execution_direction);
|
||
}
|
||
}
|
||
|
||
static void
|
||
show_schedule_multiple (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
gdb_printf (file, _("Resuming the execution of threads "
|
||
"of all processes is %s.\n"), value);
|
||
}
|
||
|
||
/* Implementation of `siginfo' variable. */
|
||
|
||
static const struct internalvar_funcs siginfo_funcs =
|
||
{
|
||
siginfo_make_value,
|
||
NULL,
|
||
};
|
||
|
||
/* Callback for infrun's target events source. This is marked when a
|
||
thread has a pending status to process. */
|
||
|
||
static void
|
||
infrun_async_inferior_event_handler (gdb_client_data data)
|
||
{
|
||
clear_async_event_handler (infrun_async_inferior_event_token);
|
||
inferior_event_handler (INF_REG_EVENT);
|
||
}
|
||
|
||
#if GDB_SELF_TEST
|
||
namespace selftests
|
||
{
|
||
|
||
/* Verify that when two threads with the same ptid exist (from two different
|
||
targets) and one of them changes ptid, we only update inferior_ptid if
|
||
it is appropriate. */
|
||
|
||
static void
|
||
infrun_thread_ptid_changed ()
|
||
{
|
||
gdbarch *arch = current_inferior ()->gdbarch;
|
||
|
||
/* The thread which inferior_ptid represents changes ptid. */
|
||
{
|
||
scoped_restore_current_pspace_and_thread restore;
|
||
|
||
scoped_mock_context<test_target_ops> target1 (arch);
|
||
scoped_mock_context<test_target_ops> target2 (arch);
|
||
|
||
ptid_t old_ptid (111, 222);
|
||
ptid_t new_ptid (111, 333);
|
||
|
||
target1.mock_inferior.pid = old_ptid.pid ();
|
||
target1.mock_thread.ptid = old_ptid;
|
||
target1.mock_inferior.ptid_thread_map.clear ();
|
||
target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread;
|
||
|
||
target2.mock_inferior.pid = old_ptid.pid ();
|
||
target2.mock_thread.ptid = old_ptid;
|
||
target2.mock_inferior.ptid_thread_map.clear ();
|
||
target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread;
|
||
|
||
auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid);
|
||
set_current_inferior (&target1.mock_inferior);
|
||
|
||
thread_change_ptid (&target1.mock_target, old_ptid, new_ptid);
|
||
|
||
gdb_assert (inferior_ptid == new_ptid);
|
||
}
|
||
|
||
/* A thread with the same ptid as inferior_ptid, but from another target,
|
||
changes ptid. */
|
||
{
|
||
scoped_restore_current_pspace_and_thread restore;
|
||
|
||
scoped_mock_context<test_target_ops> target1 (arch);
|
||
scoped_mock_context<test_target_ops> target2 (arch);
|
||
|
||
ptid_t old_ptid (111, 222);
|
||
ptid_t new_ptid (111, 333);
|
||
|
||
target1.mock_inferior.pid = old_ptid.pid ();
|
||
target1.mock_thread.ptid = old_ptid;
|
||
target1.mock_inferior.ptid_thread_map.clear ();
|
||
target1.mock_inferior.ptid_thread_map[old_ptid] = &target1.mock_thread;
|
||
|
||
target2.mock_inferior.pid = old_ptid.pid ();
|
||
target2.mock_thread.ptid = old_ptid;
|
||
target2.mock_inferior.ptid_thread_map.clear ();
|
||
target2.mock_inferior.ptid_thread_map[old_ptid] = &target2.mock_thread;
|
||
|
||
auto restore_inferior_ptid = make_scoped_restore (&inferior_ptid, old_ptid);
|
||
set_current_inferior (&target2.mock_inferior);
|
||
|
||
thread_change_ptid (&target1.mock_target, old_ptid, new_ptid);
|
||
|
||
gdb_assert (inferior_ptid == old_ptid);
|
||
}
|
||
}
|
||
|
||
} /* namespace selftests */
|
||
|
||
#endif /* GDB_SELF_TEST */
|
||
|
||
void _initialize_infrun ();
|
||
void
|
||
_initialize_infrun ()
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
/* Register extra event sources in the event loop. */
|
||
infrun_async_inferior_event_token
|
||
= create_async_event_handler (infrun_async_inferior_event_handler, NULL,
|
||
"infrun");
|
||
|
||
cmd_list_element *info_signals_cmd
|
||
= add_info ("signals", info_signals_command, _("\
|
||
What debugger does when program gets various signals.\n\
|
||
Specify a signal as argument to print info on that signal only."));
|
||
add_info_alias ("handle", info_signals_cmd, 0);
|
||
|
||
c = add_com ("handle", class_run, handle_command, _("\
|
||
Specify how to handle signals.\n\
|
||
Usage: handle SIGNAL [ACTIONS]\n\
|
||
Args are signals and actions to apply to those signals.\n\
|
||
If no actions are specified, the current settings for the specified signals\n\
|
||
will be displayed instead.\n\
|
||
\n\
|
||
Symbolic signals (e.g. SIGSEGV) are recommended but numeric signals\n\
|
||
from 1-15 are allowed for compatibility with old versions of GDB.\n\
|
||
Numeric ranges may be specified with the form LOW-HIGH (e.g. 1-5).\n\
|
||
The special arg \"all\" is recognized to mean all signals except those\n\
|
||
used by the debugger, typically SIGTRAP and SIGINT.\n\
|
||
\n\
|
||
Recognized actions include \"stop\", \"nostop\", \"print\", \"noprint\",\n\
|
||
\"pass\", \"nopass\", \"ignore\", or \"noignore\".\n\
|
||
Stop means reenter debugger if this signal happens (implies print).\n\
|
||
Print means print a message if this signal happens.\n\
|
||
Pass means let program see this signal; otherwise program doesn't know.\n\
|
||
Ignore is a synonym for nopass and noignore is a synonym for pass.\n\
|
||
Pass and Stop may be combined.\n\
|
||
\n\
|
||
Multiple signals may be specified. Signal numbers and signal names\n\
|
||
may be interspersed with actions, with the actions being performed for\n\
|
||
all signals cumulatively specified."));
|
||
set_cmd_completer (c, handle_completer);
|
||
|
||
stop_command = add_cmd ("stop", class_obscure,
|
||
not_just_help_class_command, _("\
|
||
There is no `stop' command, but you can set a hook on `stop'.\n\
|
||
This allows you to set a list of commands to be run each time execution\n\
|
||
of the program stops."), &cmdlist);
|
||
|
||
add_setshow_boolean_cmd
|
||
("infrun", class_maintenance, &debug_infrun,
|
||
_("Set inferior debugging."),
|
||
_("Show inferior debugging."),
|
||
_("When non-zero, inferior specific debugging is enabled."),
|
||
NULL, show_debug_infrun, &setdebuglist, &showdebuglist);
|
||
|
||
add_setshow_boolean_cmd ("non-stop", no_class,
|
||
&non_stop_1, _("\
|
||
Set whether gdb controls the inferior in non-stop mode."), _("\
|
||
Show whether gdb controls the inferior in non-stop mode."), _("\
|
||
When debugging a multi-threaded program and this setting is\n\
|
||
off (the default, also called all-stop mode), when one thread stops\n\
|
||
(for a breakpoint, watchpoint, exception, or similar events), GDB stops\n\
|
||
all other threads in the program while you interact with the thread of\n\
|
||
interest. When you continue or step a thread, you can allow the other\n\
|
||
threads to run, or have them remain stopped, but while you inspect any\n\
|
||
thread's state, all threads stop.\n\
|
||
\n\
|
||
In non-stop mode, when one thread stops, other threads can continue\n\
|
||
to run freely. You'll be able to step each thread independently,\n\
|
||
leave it stopped or free to run as needed."),
|
||
set_non_stop,
|
||
show_non_stop,
|
||
&setlist,
|
||
&showlist);
|
||
|
||
for (size_t i = 0; i < GDB_SIGNAL_LAST; i++)
|
||
{
|
||
signal_stop[i] = 1;
|
||
signal_print[i] = 1;
|
||
signal_program[i] = 1;
|
||
signal_catch[i] = 0;
|
||
}
|
||
|
||
/* Signals caused by debugger's own actions should not be given to
|
||
the program afterwards.
|
||
|
||
Do not deliver GDB_SIGNAL_TRAP by default, except when the user
|
||
explicitly specifies that it should be delivered to the target
|
||
program. Typically, that would occur when a user is debugging a
|
||
target monitor on a simulator: the target monitor sets a
|
||
breakpoint; the simulator encounters this breakpoint and halts
|
||
the simulation handing control to GDB; GDB, noting that the stop
|
||
address doesn't map to any known breakpoint, returns control back
|
||
to the simulator; the simulator then delivers the hardware
|
||
equivalent of a GDB_SIGNAL_TRAP to the program being
|
||
debugged. */
|
||
signal_program[GDB_SIGNAL_TRAP] = 0;
|
||
signal_program[GDB_SIGNAL_INT] = 0;
|
||
|
||
/* Signals that are not errors should not normally enter the debugger. */
|
||
signal_stop[GDB_SIGNAL_ALRM] = 0;
|
||
signal_print[GDB_SIGNAL_ALRM] = 0;
|
||
signal_stop[GDB_SIGNAL_VTALRM] = 0;
|
||
signal_print[GDB_SIGNAL_VTALRM] = 0;
|
||
signal_stop[GDB_SIGNAL_PROF] = 0;
|
||
signal_print[GDB_SIGNAL_PROF] = 0;
|
||
signal_stop[GDB_SIGNAL_CHLD] = 0;
|
||
signal_print[GDB_SIGNAL_CHLD] = 0;
|
||
signal_stop[GDB_SIGNAL_IO] = 0;
|
||
signal_print[GDB_SIGNAL_IO] = 0;
|
||
signal_stop[GDB_SIGNAL_POLL] = 0;
|
||
signal_print[GDB_SIGNAL_POLL] = 0;
|
||
signal_stop[GDB_SIGNAL_URG] = 0;
|
||
signal_print[GDB_SIGNAL_URG] = 0;
|
||
signal_stop[GDB_SIGNAL_WINCH] = 0;
|
||
signal_print[GDB_SIGNAL_WINCH] = 0;
|
||
signal_stop[GDB_SIGNAL_PRIO] = 0;
|
||
signal_print[GDB_SIGNAL_PRIO] = 0;
|
||
|
||
/* These signals are used internally by user-level thread
|
||
implementations. (See signal(5) on Solaris.) Like the above
|
||
signals, a healthy program receives and handles them as part of
|
||
its normal operation. */
|
||
signal_stop[GDB_SIGNAL_LWP] = 0;
|
||
signal_print[GDB_SIGNAL_LWP] = 0;
|
||
signal_stop[GDB_SIGNAL_WAITING] = 0;
|
||
signal_print[GDB_SIGNAL_WAITING] = 0;
|
||
signal_stop[GDB_SIGNAL_CANCEL] = 0;
|
||
signal_print[GDB_SIGNAL_CANCEL] = 0;
|
||
signal_stop[GDB_SIGNAL_LIBRT] = 0;
|
||
signal_print[GDB_SIGNAL_LIBRT] = 0;
|
||
|
||
/* Update cached state. */
|
||
signal_cache_update (-1);
|
||
|
||
add_setshow_zinteger_cmd ("stop-on-solib-events", class_support,
|
||
&stop_on_solib_events, _("\
|
||
Set stopping for shared library events."), _("\
|
||
Show stopping for shared library events."), _("\
|
||
If nonzero, gdb will give control to the user when the dynamic linker\n\
|
||
notifies gdb of shared library events. The most common event of interest\n\
|
||
to the user would be loading/unloading of a new library."),
|
||
set_stop_on_solib_events,
|
||
show_stop_on_solib_events,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_enum_cmd ("follow-fork-mode", class_run,
|
||
follow_fork_mode_kind_names,
|
||
&follow_fork_mode_string, _("\
|
||
Set debugger response to a program call of fork or vfork."), _("\
|
||
Show debugger response to a program call of fork or vfork."), _("\
|
||
A fork or vfork creates a new process. follow-fork-mode can be:\n\
|
||
parent - the original process is debugged after a fork\n\
|
||
child - the new process is debugged after a fork\n\
|
||
The unfollowed process will continue to run.\n\
|
||
By default, the debugger will follow the parent process."),
|
||
NULL,
|
||
show_follow_fork_mode_string,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_enum_cmd ("follow-exec-mode", class_run,
|
||
follow_exec_mode_names,
|
||
&follow_exec_mode_string, _("\
|
||
Set debugger response to a program call of exec."), _("\
|
||
Show debugger response to a program call of exec."), _("\
|
||
An exec call replaces the program image of a process.\n\
|
||
\n\
|
||
follow-exec-mode can be:\n\
|
||
\n\
|
||
new - the debugger creates a new inferior and rebinds the process\n\
|
||
to this new inferior. The program the process was running before\n\
|
||
the exec call can be restarted afterwards by restarting the original\n\
|
||
inferior.\n\
|
||
\n\
|
||
same - the debugger keeps the process bound to the same inferior.\n\
|
||
The new executable image replaces the previous executable loaded in\n\
|
||
the inferior. Restarting the inferior after the exec call restarts\n\
|
||
the executable the process was running after the exec call.\n\
|
||
\n\
|
||
By default, the debugger will use the same inferior."),
|
||
NULL,
|
||
show_follow_exec_mode_string,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_enum_cmd ("scheduler-locking", class_run,
|
||
scheduler_enums, &scheduler_mode, _("\
|
||
Set mode for locking scheduler during execution."), _("\
|
||
Show mode for locking scheduler during execution."), _("\
|
||
off == no locking (threads may preempt at any time)\n\
|
||
on == full locking (no thread except the current thread may run)\n\
|
||
This applies to both normal execution and replay mode.\n\
|
||
step == scheduler locked during stepping commands (step, next, stepi, nexti).\n\
|
||
In this mode, other threads may run during other commands.\n\
|
||
This applies to both normal execution and replay mode.\n\
|
||
replay == scheduler locked in replay mode and unlocked during normal execution."),
|
||
set_schedlock_func, /* traps on target vector */
|
||
show_scheduler_mode,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_boolean_cmd ("schedule-multiple", class_run, &sched_multi, _("\
|
||
Set mode for resuming threads of all processes."), _("\
|
||
Show mode for resuming threads of all processes."), _("\
|
||
When on, execution commands (such as 'continue' or 'next') resume all\n\
|
||
threads of all processes. When off (which is the default), execution\n\
|
||
commands only resume the threads of the current process. The set of\n\
|
||
threads that are resumed is further refined by the scheduler-locking\n\
|
||
mode (see help set scheduler-locking)."),
|
||
NULL,
|
||
show_schedule_multiple,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_boolean_cmd ("step-mode", class_run, &step_stop_if_no_debug, _("\
|
||
Set mode of the step operation."), _("\
|
||
Show mode of the step operation."), _("\
|
||
When set, doing a step over a function without debug line information\n\
|
||
will stop at the first instruction of that function. Otherwise, the\n\
|
||
function is skipped and the step command stops at a different source line."),
|
||
NULL,
|
||
show_step_stop_if_no_debug,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_auto_boolean_cmd ("displaced-stepping", class_run,
|
||
&can_use_displaced_stepping, _("\
|
||
Set debugger's willingness to use displaced stepping."), _("\
|
||
Show debugger's willingness to use displaced stepping."), _("\
|
||
If on, gdb will use displaced stepping to step over breakpoints if it is\n\
|
||
supported by the target architecture. If off, gdb will not use displaced\n\
|
||
stepping to step over breakpoints, even if such is supported by the target\n\
|
||
architecture. If auto (which is the default), gdb will use displaced stepping\n\
|
||
if the target architecture supports it and non-stop mode is active, but will not\n\
|
||
use it in all-stop mode (see help set non-stop)."),
|
||
NULL,
|
||
show_can_use_displaced_stepping,
|
||
&setlist, &showlist);
|
||
|
||
add_setshow_enum_cmd ("exec-direction", class_run, exec_direction_names,
|
||
&exec_direction, _("Set direction of execution.\n\
|
||
Options are 'forward' or 'reverse'."),
|
||
_("Show direction of execution (forward/reverse)."),
|
||
_("Tells gdb whether to execute forward or backward."),
|
||
set_exec_direction_func, show_exec_direction_func,
|
||
&setlist, &showlist);
|
||
|
||
/* Set/show detach-on-fork: user-settable mode. */
|
||
|
||
add_setshow_boolean_cmd ("detach-on-fork", class_run, &detach_fork, _("\
|
||
Set whether gdb will detach the child of a fork."), _("\
|
||
Show whether gdb will detach the child of a fork."), _("\
|
||
Tells gdb whether to detach the child of a fork."),
|
||
NULL, NULL, &setlist, &showlist);
|
||
|
||
/* Set/show disable address space randomization mode. */
|
||
|
||
add_setshow_boolean_cmd ("disable-randomization", class_support,
|
||
&disable_randomization, _("\
|
||
Set disabling of debuggee's virtual address space randomization."), _("\
|
||
Show disabling of debuggee's virtual address space randomization."), _("\
|
||
When this mode is on (which is the default), randomization of the virtual\n\
|
||
address space is disabled. Standalone programs run with the randomization\n\
|
||
enabled by default on some platforms."),
|
||
&set_disable_randomization,
|
||
&show_disable_randomization,
|
||
&setlist, &showlist);
|
||
|
||
/* ptid initializations */
|
||
inferior_ptid = null_ptid;
|
||
target_last_wait_ptid = minus_one_ptid;
|
||
|
||
gdb::observers::thread_ptid_changed.attach (infrun_thread_ptid_changed,
|
||
"infrun");
|
||
gdb::observers::thread_stop_requested.attach (infrun_thread_stop_requested,
|
||
"infrun");
|
||
gdb::observers::thread_exit.attach (infrun_thread_thread_exit, "infrun");
|
||
gdb::observers::inferior_exit.attach (infrun_inferior_exit, "infrun");
|
||
gdb::observers::inferior_execd.attach (infrun_inferior_execd, "infrun");
|
||
|
||
/* Explicitly create without lookup, since that tries to create a
|
||
value with a void typed value, and when we get here, gdbarch
|
||
isn't initialized yet. At this point, we're quite sure there
|
||
isn't another convenience variable of the same name. */
|
||
create_internalvar_type_lazy ("_siginfo", &siginfo_funcs, NULL);
|
||
|
||
add_setshow_boolean_cmd ("observer", no_class,
|
||
&observer_mode_1, _("\
|
||
Set whether gdb controls the inferior in observer mode."), _("\
|
||
Show whether gdb controls the inferior in observer mode."), _("\
|
||
In observer mode, GDB can get data from the inferior, but not\n\
|
||
affect its execution. Registers and memory may not be changed,\n\
|
||
breakpoints may not be set, and the program cannot be interrupted\n\
|
||
or signalled."),
|
||
set_observer_mode,
|
||
show_observer_mode,
|
||
&setlist,
|
||
&showlist);
|
||
|
||
#if GDB_SELF_TEST
|
||
selftests::register_test ("infrun_thread_ptid_changed",
|
||
selftests::infrun_thread_ptid_changed);
|
||
#endif
|
||
}
|