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04977957ec
gdbserver/ChangeLog: 2021-04-12 Tankut Baris Aktemur <tankut.baris.aktemur@intel.com> * target.h (class process_stratum_target) <pid_to_exec_file>: Constify the return type. Update the definition/references below. * target.cc (process_stratum_target::pid_to_exec_file) * linux-low.h (class linux_process_target) <pid_to_exec_file> * linux-low.cc (linux_process_target::pid_to_exec_file) * netbsd-low.h (class netbsd_process_target) <pid_to_exec_file> * netbsd-low.cc (netbsd_process_target::pid_to_exec_file) * server.cc (handle_qxfer_exec_file)
898 lines
32 KiB
C++
898 lines
32 KiB
C++
/* Internal interfaces for the GNU/Linux specific target code for gdbserver.
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Copyright (C) 2002-2021 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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#ifndef GDBSERVER_LINUX_LOW_H
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#define GDBSERVER_LINUX_LOW_H
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#include "nat/linux-nat.h"
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#include "nat/gdb_thread_db.h"
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#include <signal.h>
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#include "gdbthread.h"
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#include "gdb_proc_service.h"
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/* Included for ptrace type definitions. */
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#include "nat/linux-ptrace.h"
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#include "target/waitstatus.h" /* For enum target_stop_reason. */
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#include "tracepoint.h"
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#include <list>
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#define PTRACE_XFER_TYPE long
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#ifdef HAVE_LINUX_REGSETS
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typedef void (*regset_fill_func) (struct regcache *, void *);
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typedef void (*regset_store_func) (struct regcache *, const void *);
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enum regset_type {
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GENERAL_REGS,
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FP_REGS,
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EXTENDED_REGS,
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OPTIONAL_REGS, /* Do not error if the regset cannot be accessed. */
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};
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/* The arch's regsets array initializer must be terminated with a NULL
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regset. */
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#define NULL_REGSET \
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{ 0, 0, 0, -1, (enum regset_type) -1, NULL, NULL }
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struct regset_info
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{
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int get_request, set_request;
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/* If NT_TYPE isn't 0, it will be passed to ptrace as the 3rd
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argument and the 4th argument should be "const struct iovec *". */
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int nt_type;
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int size;
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enum regset_type type;
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regset_fill_func fill_function;
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regset_store_func store_function;
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};
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/* Aggregation of all the supported regsets of a given
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architecture/mode. */
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struct regsets_info
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{
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/* The regsets array. */
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struct regset_info *regsets;
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/* The number of regsets in the REGSETS array. */
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int num_regsets;
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/* If we get EIO on a regset, do not try it again. Note the set of
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supported regsets may depend on processor mode on biarch
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machines. This is a (lazily allocated) array holding one boolean
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byte (0/1) per regset, with each element corresponding to the
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regset in the REGSETS array above at the same offset. */
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char *disabled_regsets;
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};
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#endif
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/* Mapping between the general-purpose registers in `struct user'
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format and GDB's register array layout. */
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struct usrregs_info
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{
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/* The number of registers accessible. */
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int num_regs;
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/* The registers map. */
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int *regmap;
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};
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/* All info needed to access an architecture/mode's registers. */
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struct regs_info
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{
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/* Regset support bitmap: 1 for registers that are transferred as a part
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of a regset, 0 for ones that need to be handled individually. This
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can be NULL if all registers are transferred with regsets or regsets
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are not supported. */
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unsigned char *regset_bitmap;
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/* Info used when accessing registers with PTRACE_PEEKUSER /
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PTRACE_POKEUSER. This can be NULL if all registers are
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transferred with regsets .*/
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struct usrregs_info *usrregs;
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#ifdef HAVE_LINUX_REGSETS
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/* Info used when accessing registers with regsets. */
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struct regsets_info *regsets_info;
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#endif
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};
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struct process_info_private
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{
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/* Arch-specific additions. */
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struct arch_process_info *arch_private;
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/* libthread_db-specific additions. Not NULL if this process has loaded
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thread_db, and it is active. */
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struct thread_db *thread_db;
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/* &_r_debug. 0 if not yet determined. -1 if no PT_DYNAMIC in Phdrs. */
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CORE_ADDR r_debug;
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};
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struct lwp_info;
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/* Target ops definitions for a Linux target. */
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class linux_process_target : public process_stratum_target
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{
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public:
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int create_inferior (const char *program,
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const std::vector<char *> &program_args) override;
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void post_create_inferior () override;
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int attach (unsigned long pid) override;
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int kill (process_info *proc) override;
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int detach (process_info *proc) override;
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void mourn (process_info *proc) override;
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void join (int pid) override;
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bool thread_alive (ptid_t pid) override;
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void resume (thread_resume *resume_info, size_t n) override;
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ptid_t wait (ptid_t ptid, target_waitstatus *status,
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target_wait_flags options) override;
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void fetch_registers (regcache *regcache, int regno) override;
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void store_registers (regcache *regcache, int regno) override;
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int prepare_to_access_memory () override;
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void done_accessing_memory () override;
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int read_memory (CORE_ADDR memaddr, unsigned char *myaddr,
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int len) override;
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int write_memory (CORE_ADDR memaddr, const unsigned char *myaddr,
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int len) override;
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void look_up_symbols () override;
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void request_interrupt () override;
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bool supports_read_auxv () override;
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int read_auxv (CORE_ADDR offset, unsigned char *myaddr,
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unsigned int len) override;
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int insert_point (enum raw_bkpt_type type, CORE_ADDR addr,
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int size, raw_breakpoint *bp) override;
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int remove_point (enum raw_bkpt_type type, CORE_ADDR addr,
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int size, raw_breakpoint *bp) override;
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bool stopped_by_sw_breakpoint () override;
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bool supports_stopped_by_sw_breakpoint () override;
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bool stopped_by_hw_breakpoint () override;
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bool supports_stopped_by_hw_breakpoint () override;
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bool supports_hardware_single_step () override;
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bool stopped_by_watchpoint () override;
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CORE_ADDR stopped_data_address () override;
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bool supports_read_offsets () override;
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int read_offsets (CORE_ADDR *text, CORE_ADDR *data) override;
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bool supports_get_tls_address () override;
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int get_tls_address (thread_info *thread, CORE_ADDR offset,
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CORE_ADDR load_module, CORE_ADDR *address) override;
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bool supports_qxfer_osdata () override;
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int qxfer_osdata (const char *annex, unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len) override;
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bool supports_qxfer_siginfo () override;
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int qxfer_siginfo (const char *annex, unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len) override;
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bool supports_non_stop () override;
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bool async (bool enable) override;
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int start_non_stop (bool enable) override;
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bool supports_multi_process () override;
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bool supports_fork_events () override;
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bool supports_vfork_events () override;
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bool supports_exec_events () override;
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void handle_new_gdb_connection () override;
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int handle_monitor_command (char *mon) override;
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int core_of_thread (ptid_t ptid) override;
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#if defined PT_GETDSBT || defined PTRACE_GETFDPIC
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bool supports_read_loadmap () override;
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int read_loadmap (const char *annex, CORE_ADDR offset,
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unsigned char *myaddr, unsigned int len) override;
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#endif
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CORE_ADDR read_pc (regcache *regcache) override;
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void write_pc (regcache *regcache, CORE_ADDR pc) override;
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bool supports_thread_stopped () override;
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bool thread_stopped (thread_info *thread) override;
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void pause_all (bool freeze) override;
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void unpause_all (bool unfreeze) override;
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void stabilize_threads () override;
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bool supports_disable_randomization () override;
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bool supports_qxfer_libraries_svr4 () override;
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int qxfer_libraries_svr4 (const char *annex,
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unsigned char *readbuf,
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unsigned const char *writebuf,
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CORE_ADDR offset, int len) override;
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bool supports_agent () override;
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#ifdef HAVE_LINUX_BTRACE
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btrace_target_info *enable_btrace (ptid_t ptid,
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const btrace_config *conf) override;
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int disable_btrace (btrace_target_info *tinfo) override;
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int read_btrace (btrace_target_info *tinfo, buffer *buf,
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enum btrace_read_type type) override;
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int read_btrace_conf (const btrace_target_info *tinfo,
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buffer *buf) override;
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#endif
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bool supports_range_stepping () override;
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bool supports_pid_to_exec_file () override;
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const char *pid_to_exec_file (int pid) override;
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bool supports_multifs () override;
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int multifs_open (int pid, const char *filename, int flags,
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mode_t mode) override;
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int multifs_unlink (int pid, const char *filename) override;
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ssize_t multifs_readlink (int pid, const char *filename, char *buf,
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size_t bufsiz) override;
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const char *thread_name (ptid_t thread) override;
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#if USE_THREAD_DB
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bool thread_handle (ptid_t ptid, gdb_byte **handle,
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int *handle_len) override;
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#endif
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bool supports_catch_syscall () override;
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/* Return the information to access registers. This has public
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visibility because proc-service uses it. */
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virtual const regs_info *get_regs_info () = 0;
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private:
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/* Handle a GNU/Linux extended wait response. If we see a clone,
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fork, or vfork event, we need to add the new LWP to our list
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(and return 0 so as not to report the trap to higher layers).
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If we see an exec event, we will modify ORIG_EVENT_LWP to point
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to a new LWP representing the new program. */
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int handle_extended_wait (lwp_info **orig_event_lwp, int wstat);
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/* Do low-level handling of the event, and check if this is an event we want
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to report. Is so, store it as a pending status in the lwp_info structure
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corresponding to LWPID. */
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void filter_event (int lwpid, int wstat);
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/* Wait for an event from child(ren) WAIT_PTID, and return any that
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match FILTER_PTID (leaving others pending). The PTIDs can be:
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minus_one_ptid, to specify any child; a pid PTID, specifying all
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lwps of a thread group; or a PTID representing a single lwp. Store
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the stop status through the status pointer WSTAT. OPTIONS is
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passed to the waitpid call. Return 0 if no event was found and
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OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
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was found. Return the PID of the stopped child otherwise. */
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int wait_for_event_filtered (ptid_t wait_ptid, ptid_t filter_ptid,
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int *wstatp, int options);
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/* Wait for an event from child(ren) PTID. PTIDs can be:
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minus_one_ptid, to specify any child; a pid PTID, specifying all
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lwps of a thread group; or a PTID representing a single lwp. Store
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the stop status through the status pointer WSTAT. OPTIONS is
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passed to the waitpid call. Return 0 if no event was found and
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OPTIONS contains WNOHANG. Return -1 if no unwaited-for children
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was found. Return the PID of the stopped child otherwise. */
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int wait_for_event (ptid_t ptid, int *wstatp, int options);
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/* Wait for all children to stop for the SIGSTOPs we just queued. */
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void wait_for_sigstop ();
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/* Wait for process, returns status. */
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ptid_t wait_1 (ptid_t ptid, target_waitstatus *ourstatus,
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target_wait_flags target_options);
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/* Stop all lwps that aren't stopped yet, except EXCEPT, if not NULL.
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If SUSPEND, then also increase the suspend count of every LWP,
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except EXCEPT. */
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void stop_all_lwps (int suspend, lwp_info *except);
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/* Stopped LWPs that the client wanted to be running, that don't have
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pending statuses, are set to run again, except for EXCEPT, if not
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NULL. This undoes a stop_all_lwps call. */
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void unstop_all_lwps (int unsuspend, lwp_info *except);
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/* Start a step-over operation on LWP. When LWP stopped at a
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breakpoint, to make progress, we need to remove the breakpoint out
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of the way. If we let other threads run while we do that, they may
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pass by the breakpoint location and miss hitting it. To avoid
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that, a step-over momentarily stops all threads while LWP is
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single-stepped by either hardware or software while the breakpoint
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is temporarily uninserted from the inferior. When the single-step
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finishes, we reinsert the breakpoint, and let all threads that are
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supposed to be running, run again. */
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void start_step_over (lwp_info *lwp);
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/* If there's a step over in progress, wait until all threads stop
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(that is, until the stepping thread finishes its step), and
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unsuspend all lwps. The stepping thread ends with its status
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pending, which is processed later when we get back to processing
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events. */
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void complete_ongoing_step_over ();
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/* Finish a step-over. Reinsert the breakpoint we had uninserted in
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start_step_over, if still there, and delete any single-step
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breakpoints we've set, on non hardware single-step targets.
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Return true if step over finished. */
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bool finish_step_over (lwp_info *lwp);
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/* When we finish a step-over, set threads running again. If there's
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another thread that may need a step-over, now's the time to start
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it. Eventually, we'll move all threads past their breakpoints. */
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void proceed_all_lwps ();
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/* The reason we resume in the caller, is because we want to be able
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to pass lwp->status_pending as WSTAT, and we need to clear
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status_pending_p before resuming, otherwise, resume_one_lwp
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refuses to resume. */
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bool maybe_move_out_of_jump_pad (lwp_info *lwp, int *wstat);
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/* Move THREAD out of the jump pad. */
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void move_out_of_jump_pad (thread_info *thread);
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/* Call low_arch_setup on THREAD. */
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void arch_setup_thread (thread_info *thread);
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#ifdef HAVE_LINUX_USRREGS
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/* Fetch one register. */
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void fetch_register (const usrregs_info *usrregs, regcache *regcache,
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int regno);
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/* Store one register. */
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void store_register (const usrregs_info *usrregs, regcache *regcache,
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int regno);
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#endif
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/* Fetch all registers, or just one, from the child process.
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If REGNO is -1, do this for all registers, skipping any that are
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assumed to have been retrieved by regsets_fetch_inferior_registers,
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unless ALL is non-zero.
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Otherwise, REGNO specifies which register (so we can save time). */
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void usr_fetch_inferior_registers (const regs_info *regs_info,
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regcache *regcache, int regno, int all);
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/* Store our register values back into the inferior.
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If REGNO is -1, do this for all registers, skipping any that are
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assumed to have been saved by regsets_store_inferior_registers,
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unless ALL is non-zero.
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Otherwise, REGNO specifies which register (so we can save time). */
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void usr_store_inferior_registers (const regs_info *regs_info,
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regcache *regcache, int regno, int all);
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/* Return the PC as read from the regcache of LWP, without any
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adjustment. */
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CORE_ADDR get_pc (lwp_info *lwp);
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/* Called when the LWP stopped for a signal/trap. If it stopped for a
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trap check what caused it (breakpoint, watchpoint, trace, etc.),
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and save the result in the LWP's stop_reason field. If it stopped
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for a breakpoint, decrement the PC if necessary on the lwp's
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architecture. Returns true if we now have the LWP's stop PC. */
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bool save_stop_reason (lwp_info *lwp);
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/* Resume execution of LWP. If STEP is nonzero, single-step it. If
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SIGNAL is nonzero, give it that signal. */
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void resume_one_lwp_throw (lwp_info *lwp, int step, int signal,
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siginfo_t *info);
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/* Like resume_one_lwp_throw, but no error is thrown if the LWP
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disappears while we try to resume it. */
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void resume_one_lwp (lwp_info *lwp, int step, int signal, siginfo_t *info);
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/* This function is called once per thread. We check the thread's
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last resume request, which will tell us whether to resume, step, or
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leave the thread stopped. Any signal the client requested to be
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delivered has already been enqueued at this point.
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If any thread that GDB wants running is stopped at an internal
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breakpoint that needs stepping over, we start a step-over operation
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on that particular thread, and leave all others stopped. */
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void proceed_one_lwp (thread_info *thread, lwp_info *except);
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/* This function is called once per thread. We check the thread's
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resume request, which will tell us whether to resume, step, or
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leave the thread stopped; and what signal, if any, it should be
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sent.
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For threads which we aren't explicitly told otherwise, we preserve
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the stepping flag; this is used for stepping over gdbserver-placed
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breakpoints.
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If pending_flags was set in any thread, we queue any needed
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signals, since we won't actually resume. We already have a pending
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event to report, so we don't need to preserve any step requests;
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they should be re-issued if necessary. */
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void resume_one_thread (thread_info *thread, bool leave_all_stopped);
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/* Return true if this lwp has an interesting status pending. */
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bool status_pending_p_callback (thread_info *thread, ptid_t ptid);
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|
/* Resume LWPs that are currently stopped without any pending status
|
|
to report, but are resumed from the core's perspective. */
|
|
void resume_stopped_resumed_lwps (thread_info *thread);
|
|
|
|
/* Unsuspend THREAD, except EXCEPT, and proceed. */
|
|
void unsuspend_and_proceed_one_lwp (thread_info *thread, lwp_info *except);
|
|
|
|
/* Return true if this lwp still has an interesting status pending.
|
|
If not (e.g., it had stopped for a breakpoint that is gone), return
|
|
false. */
|
|
bool thread_still_has_status_pending (thread_info *thread);
|
|
|
|
/* Return true if this lwp is to-be-resumed and has an interesting
|
|
status pending. */
|
|
bool resume_status_pending (thread_info *thread);
|
|
|
|
/* Return true if this lwp that GDB wants running is stopped at an
|
|
internal breakpoint that we need to step over. It assumes that
|
|
any required STOP_PC adjustment has already been propagated to
|
|
the inferior's regcache. */
|
|
bool thread_needs_step_over (thread_info *thread);
|
|
|
|
/* Single step via hardware or software single step.
|
|
Return 1 if hardware single stepping, 0 if software single stepping
|
|
or can't single step. */
|
|
int single_step (lwp_info* lwp);
|
|
|
|
/* Return true if THREAD is doing hardware single step. */
|
|
bool maybe_hw_step (thread_info *thread);
|
|
|
|
/* Install breakpoints for software single stepping. */
|
|
void install_software_single_step_breakpoints (lwp_info *lwp);
|
|
|
|
/* Fetch the possibly triggered data watchpoint info and store it in
|
|
CHILD.
|
|
|
|
On some archs, like x86, that use debug registers to set
|
|
watchpoints, it's possible that the way to know which watched
|
|
address trapped, is to check the register that is used to select
|
|
which address to watch. Problem is, between setting the watchpoint
|
|
and reading back which data address trapped, the user may change
|
|
the set of watchpoints, and, as a consequence, GDB changes the
|
|
debug registers in the inferior. To avoid reading back a stale
|
|
stopped-data-address when that happens, we cache in LP the fact
|
|
that a watchpoint trapped, and the corresponding data address, as
|
|
soon as we see CHILD stop with a SIGTRAP. If GDB changes the debug
|
|
registers meanwhile, we have the cached data we can rely on. */
|
|
bool check_stopped_by_watchpoint (lwp_info *child);
|
|
|
|
/* Convert a native/host siginfo object, into/from the siginfo in the
|
|
layout of the inferiors' architecture. */
|
|
void siginfo_fixup (siginfo_t *siginfo, gdb_byte *inf_siginfo,
|
|
int direction);
|
|
|
|
/* Add a process to the common process list, and set its private
|
|
data. */
|
|
process_info *add_linux_process (int pid, int attached);
|
|
|
|
/* Add a new thread. */
|
|
lwp_info *add_lwp (ptid_t ptid);
|
|
|
|
/* Delete a thread. */
|
|
void delete_lwp (lwp_info *lwp);
|
|
|
|
public: /* Make this public because it's used from outside. */
|
|
/* Attach to an inferior process. Returns 0 on success, ERRNO on
|
|
error. */
|
|
int attach_lwp (ptid_t ptid);
|
|
|
|
private: /* Back to private. */
|
|
/* Detach from LWP. */
|
|
void detach_one_lwp (lwp_info *lwp);
|
|
|
|
/* Detect zombie thread group leaders, and "exit" them. We can't
|
|
reap their exits until all other threads in the group have
|
|
exited. */
|
|
void check_zombie_leaders ();
|
|
|
|
/* Convenience function that is called when the kernel reports an exit
|
|
event. This decides whether to report the event to GDB as a
|
|
process exit event, a thread exit event, or to suppress the
|
|
event. */
|
|
ptid_t filter_exit_event (lwp_info *event_child,
|
|
target_waitstatus *ourstatus);
|
|
|
|
/* Returns true if THREAD is stopped in a jump pad, and we can't
|
|
move it out, because we need to report the stop event to GDB. For
|
|
example, if the user puts a breakpoint in the jump pad, it's
|
|
because she wants to debug it. */
|
|
bool stuck_in_jump_pad (thread_info *thread);
|
|
|
|
/* Convenience wrapper. Returns information about LWP's fast tracepoint
|
|
collection status. */
|
|
fast_tpoint_collect_result linux_fast_tracepoint_collecting
|
|
(lwp_info *lwp, fast_tpoint_collect_status *status);
|
|
|
|
/* This function should only be called if LWP got a SYSCALL_SIGTRAP.
|
|
Fill *SYSNO with the syscall nr trapped. */
|
|
void get_syscall_trapinfo (lwp_info *lwp, int *sysno);
|
|
|
|
/* Returns true if GDB is interested in the event_child syscall.
|
|
Only to be called when stopped reason is SYSCALL_SIGTRAP. */
|
|
bool gdb_catch_this_syscall (lwp_info *event_child);
|
|
|
|
protected:
|
|
/* The architecture-specific "low" methods are listed below. */
|
|
|
|
/* Architecture-specific setup for the current thread. */
|
|
virtual void low_arch_setup () = 0;
|
|
|
|
/* Return false if we can fetch/store the register, true if we cannot
|
|
fetch/store the register. */
|
|
virtual bool low_cannot_fetch_register (int regno) = 0;
|
|
|
|
virtual bool low_cannot_store_register (int regno) = 0;
|
|
|
|
/* Hook to fetch a register in some non-standard way. Used for
|
|
example by backends that have read-only registers with hardcoded
|
|
values (e.g., IA64's gr0/fr0/fr1). Returns true if register
|
|
REGNO was supplied, false if not, and we should fallback to the
|
|
standard ptrace methods. */
|
|
virtual bool low_fetch_register (regcache *regcache, int regno);
|
|
|
|
/* Return true if breakpoints are supported. Such targets must
|
|
implement the GET_PC and SET_PC methods. */
|
|
virtual bool low_supports_breakpoints ();
|
|
|
|
virtual CORE_ADDR low_get_pc (regcache *regcache);
|
|
|
|
virtual void low_set_pc (regcache *regcache, CORE_ADDR newpc);
|
|
|
|
/* Find the next possible PCs after the current instruction executes.
|
|
Targets that override this method should also override
|
|
'supports_software_single_step' to return true. */
|
|
virtual std::vector<CORE_ADDR> low_get_next_pcs (regcache *regcache);
|
|
|
|
/* Return true if there is a breakpoint at PC. */
|
|
virtual bool low_breakpoint_at (CORE_ADDR pc) = 0;
|
|
|
|
/* Breakpoint and watchpoint related functions. See target.h for
|
|
comments. */
|
|
virtual int low_insert_point (raw_bkpt_type type, CORE_ADDR addr,
|
|
int size, raw_breakpoint *bp);
|
|
|
|
virtual int low_remove_point (raw_bkpt_type type, CORE_ADDR addr,
|
|
int size, raw_breakpoint *bp);
|
|
|
|
virtual bool low_stopped_by_watchpoint ();
|
|
|
|
virtual CORE_ADDR low_stopped_data_address ();
|
|
|
|
/* Hooks to reformat register data for PEEKUSR/POKEUSR (in particular
|
|
for registers smaller than an xfer unit). */
|
|
virtual void low_collect_ptrace_register (regcache *regcache, int regno,
|
|
char *buf);
|
|
|
|
virtual void low_supply_ptrace_register (regcache *regcache, int regno,
|
|
const char *buf);
|
|
|
|
/* Hook to convert from target format to ptrace format and back.
|
|
Returns true if any conversion was done; false otherwise.
|
|
If DIRECTION is 1, then copy from INF to NATIVE.
|
|
If DIRECTION is 0, copy from NATIVE to INF. */
|
|
virtual bool low_siginfo_fixup (siginfo_t *native, gdb_byte *inf,
|
|
int direction);
|
|
|
|
/* Hook to call when a new process is created or attached to.
|
|
If extra per-process architecture-specific data is needed,
|
|
allocate it here. */
|
|
virtual arch_process_info *low_new_process ();
|
|
|
|
/* Hook to call when a process is being deleted. If extra per-process
|
|
architecture-specific data is needed, delete it here. */
|
|
virtual void low_delete_process (arch_process_info *info);
|
|
|
|
/* Hook to call when a new thread is detected.
|
|
If extra per-thread architecture-specific data is needed,
|
|
allocate it here. */
|
|
virtual void low_new_thread (lwp_info *);
|
|
|
|
/* Hook to call when a thread is being deleted. If extra per-thread
|
|
architecture-specific data is needed, delete it here. */
|
|
virtual void low_delete_thread (arch_lwp_info *);
|
|
|
|
/* Hook to call, if any, when a new fork is attached. */
|
|
virtual void low_new_fork (process_info *parent, process_info *child);
|
|
|
|
/* Hook to call prior to resuming a thread. */
|
|
virtual void low_prepare_to_resume (lwp_info *lwp);
|
|
|
|
/* Fill ADDRP with the thread area address of LWPID. Returns 0 on
|
|
success, -1 on failure. */
|
|
virtual int low_get_thread_area (int lwpid, CORE_ADDR *addrp);
|
|
|
|
/* Returns true if the low target supports range stepping. */
|
|
virtual bool low_supports_range_stepping ();
|
|
|
|
/* Return true if the target supports catch syscall. Such targets
|
|
override the low_get_syscall_trapinfo method below. */
|
|
virtual bool low_supports_catch_syscall ();
|
|
|
|
/* Fill *SYSNO with the syscall nr trapped. Only to be called when
|
|
inferior is stopped due to SYSCALL_SIGTRAP. */
|
|
virtual void low_get_syscall_trapinfo (regcache *regcache, int *sysno);
|
|
|
|
/* How many bytes the PC should be decremented after a break. */
|
|
virtual int low_decr_pc_after_break ();
|
|
};
|
|
|
|
extern linux_process_target *the_linux_target;
|
|
|
|
#define get_thread_lwp(thr) ((struct lwp_info *) (thread_target_data (thr)))
|
|
#define get_lwp_thread(lwp) ((lwp)->thread)
|
|
|
|
/* Information about a signal that is to be delivered to a thread. */
|
|
|
|
struct pending_signal
|
|
{
|
|
pending_signal (int signal)
|
|
: signal {signal}
|
|
{};
|
|
|
|
int signal;
|
|
siginfo_t info;
|
|
};
|
|
|
|
/* This struct is recorded in the target_data field of struct thread_info.
|
|
|
|
On linux ``all_threads'' is keyed by the LWP ID, which we use as the
|
|
GDB protocol representation of the thread ID. Threads also have
|
|
a "process ID" (poorly named) which is (presently) the same as the
|
|
LWP ID.
|
|
|
|
There is also ``all_processes'' is keyed by the "overall process ID",
|
|
which GNU/Linux calls tgid, "thread group ID". */
|
|
|
|
struct lwp_info
|
|
{
|
|
/* Backlink to the parent object. */
|
|
struct thread_info *thread;
|
|
|
|
/* If this flag is set, the next SIGSTOP will be ignored (the
|
|
process will be immediately resumed). This means that either we
|
|
sent the SIGSTOP to it ourselves and got some other pending event
|
|
(so the SIGSTOP is still pending), or that we stopped the
|
|
inferior implicitly via PTRACE_ATTACH and have not waited for it
|
|
yet. */
|
|
int stop_expected;
|
|
|
|
/* When this is true, we shall not try to resume this thread, even
|
|
if last_resume_kind isn't resume_stop. */
|
|
int suspended;
|
|
|
|
/* If this flag is set, the lwp is known to be stopped right now (stop
|
|
event already received in a wait()). */
|
|
int stopped;
|
|
|
|
/* Signal whether we are in a SYSCALL_ENTRY or
|
|
in a SYSCALL_RETURN event.
|
|
Values:
|
|
- TARGET_WAITKIND_SYSCALL_ENTRY
|
|
- TARGET_WAITKIND_SYSCALL_RETURN */
|
|
enum target_waitkind syscall_state;
|
|
|
|
/* When stopped is set, the last wait status recorded for this lwp. */
|
|
int last_status;
|
|
|
|
/* If WAITSTATUS->KIND != TARGET_WAITKIND_IGNORE, the waitstatus for
|
|
this LWP's last event, to pass to GDB without any further
|
|
processing. This is used to store extended ptrace event
|
|
information or exit status until it can be reported to GDB. */
|
|
struct target_waitstatus waitstatus;
|
|
|
|
/* A pointer to the fork child/parent relative. Valid only while
|
|
the parent fork event is not reported to higher layers. Used to
|
|
avoid wildcard vCont actions resuming a fork child before GDB is
|
|
notified about the parent's fork event. */
|
|
struct lwp_info *fork_relative;
|
|
|
|
/* When stopped is set, this is where the lwp last stopped, with
|
|
decr_pc_after_break already accounted for. If the LWP is
|
|
running, this is the address at which the lwp was resumed. */
|
|
CORE_ADDR stop_pc;
|
|
|
|
/* If this flag is set, STATUS_PENDING is a waitstatus that has not yet
|
|
been reported. */
|
|
int status_pending_p;
|
|
int status_pending;
|
|
|
|
/* The reason the LWP last stopped, if we need to track it
|
|
(breakpoint, watchpoint, etc.) */
|
|
enum target_stop_reason stop_reason;
|
|
|
|
/* On architectures where it is possible to know the data address of
|
|
a triggered watchpoint, STOPPED_DATA_ADDRESS is non-zero, and
|
|
contains such data address. Only valid if STOPPED_BY_WATCHPOINT
|
|
is true. */
|
|
CORE_ADDR stopped_data_address;
|
|
|
|
/* If this is non-zero, it is a breakpoint to be reinserted at our next
|
|
stop (SIGTRAP stops only). */
|
|
CORE_ADDR bp_reinsert;
|
|
|
|
/* If this flag is set, the last continue operation at the ptrace
|
|
level on this process was a single-step. */
|
|
int stepping;
|
|
|
|
/* Range to single step within. This is a copy of the step range
|
|
passed along the last resume request. See 'struct
|
|
thread_resume'. */
|
|
CORE_ADDR step_range_start; /* Inclusive */
|
|
CORE_ADDR step_range_end; /* Exclusive */
|
|
|
|
/* If this flag is set, we need to set the event request flags the
|
|
next time we see this LWP stop. */
|
|
int must_set_ptrace_flags;
|
|
|
|
/* A chain of signals that need to be delivered to this process. */
|
|
std::list<pending_signal> pending_signals;
|
|
|
|
/* A link used when resuming. It is initialized from the resume request,
|
|
and then processed and cleared in linux_resume_one_lwp. */
|
|
struct thread_resume *resume;
|
|
|
|
/* Information bout this lwp's fast tracepoint collection status (is it
|
|
currently stopped in the jump pad, and if so, before or at/after the
|
|
relocated instruction). Normally, we won't care about this, but we will
|
|
if a signal arrives to this lwp while it is collecting. */
|
|
fast_tpoint_collect_result collecting_fast_tracepoint;
|
|
|
|
/* A chain of signals that need to be reported to GDB. These were
|
|
deferred because the thread was doing a fast tracepoint collect
|
|
when they arrived. */
|
|
std::list<pending_signal> pending_signals_to_report;
|
|
|
|
/* When collecting_fast_tracepoint is first found to be 1, we insert
|
|
a exit-jump-pad-quickly breakpoint. This is it. */
|
|
struct breakpoint *exit_jump_pad_bkpt;
|
|
|
|
#ifdef USE_THREAD_DB
|
|
int thread_known;
|
|
/* The thread handle, used for e.g. TLS access. Only valid if
|
|
THREAD_KNOWN is set. */
|
|
td_thrhandle_t th;
|
|
|
|
/* The pthread_t handle. */
|
|
thread_t thread_handle;
|
|
#endif
|
|
|
|
/* Arch-specific additions. */
|
|
struct arch_lwp_info *arch_private;
|
|
};
|
|
|
|
int linux_pid_exe_is_elf_64_file (int pid, unsigned int *machine);
|
|
|
|
/* Attach to PTID. Returns 0 on success, non-zero otherwise (an
|
|
errno). */
|
|
int linux_attach_lwp (ptid_t ptid);
|
|
|
|
struct lwp_info *find_lwp_pid (ptid_t ptid);
|
|
/* For linux_stop_lwp see nat/linux-nat.h. */
|
|
|
|
#ifdef HAVE_LINUX_REGSETS
|
|
void initialize_regsets_info (struct regsets_info *regsets_info);
|
|
#endif
|
|
|
|
void initialize_low_arch (void);
|
|
|
|
void linux_set_pc_32bit (struct regcache *regcache, CORE_ADDR pc);
|
|
CORE_ADDR linux_get_pc_32bit (struct regcache *regcache);
|
|
|
|
void linux_set_pc_64bit (struct regcache *regcache, CORE_ADDR pc);
|
|
CORE_ADDR linux_get_pc_64bit (struct regcache *regcache);
|
|
|
|
/* From thread-db.c */
|
|
int thread_db_init (void);
|
|
void thread_db_detach (struct process_info *);
|
|
void thread_db_mourn (struct process_info *);
|
|
int thread_db_handle_monitor_command (char *);
|
|
int thread_db_get_tls_address (struct thread_info *thread, CORE_ADDR offset,
|
|
CORE_ADDR load_module, CORE_ADDR *address);
|
|
int thread_db_look_up_one_symbol (const char *name, CORE_ADDR *addrp);
|
|
|
|
/* Called from linux-low.c when a clone event is detected. Upon entry,
|
|
both the clone and the parent should be stopped. This function does
|
|
whatever is required have the clone under thread_db's control. */
|
|
|
|
void thread_db_notice_clone (struct thread_info *parent_thr, ptid_t child_ptid);
|
|
|
|
bool thread_db_thread_handle (ptid_t ptid, gdb_byte **handle, int *handle_len);
|
|
|
|
extern int have_ptrace_getregset;
|
|
|
|
/* Search for the value with type MATCH in the auxv vector with
|
|
entries of length WORDSIZE bytes. If found, store the value in
|
|
*VALP and return 1. If not found or if there is an error, return
|
|
0. */
|
|
|
|
int linux_get_auxv (int wordsize, CORE_ADDR match,
|
|
CORE_ADDR *valp);
|
|
|
|
/* Fetch the AT_HWCAP entry from the auxv vector, where entries are length
|
|
WORDSIZE. If no entry was found, return zero. */
|
|
|
|
CORE_ADDR linux_get_hwcap (int wordsize);
|
|
|
|
/* Fetch the AT_HWCAP2 entry from the auxv vector, where entries are length
|
|
WORDSIZE. If no entry was found, return zero. */
|
|
|
|
CORE_ADDR linux_get_hwcap2 (int wordsize);
|
|
|
|
#endif /* GDBSERVER_LINUX_LOW_H */
|