mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
e1c3a37375
On ARM, PikeOS does not support hardware single step, causing various semi-random errors when trying to next/step over some user code. So this patch changes this target to use software-single-step instead. The challenge is that, up to now, the PikeOS target was in all respects identical to a baremetal target as far as GDB was concerned, meaning we were using the baremetal osabi for this target too. This is no longer possible, and we need to introduce a new OSABI variant. Unfortunately, there isn't anything in the object file that would allow us to differentiate between the two platforms. So we have to rely on a heuristic instead, where we look for some known symbols that are required in a PikeOS application (these symbols are expected to be defined by the default linker script, and correspond to routines used to allocate the application stack). For the long run, the hope is that the stub implementation provided by PikeOS is enhanced so that it includes vContSupported+ to the $qSupported query, and then that the reply to the "vCont?" query only return support for "continue" operations (thus exclusing "step" operations). We could then use that information to reliably determine at connection time that the target does not support single-stepping and therefore automatically turn software single-stepping automatically based on it. gdb/ChangeLog: * defs.h (enum gdb_osabi): Add GDB_OSABI_PIKEOS. * osabi.c (gdb_osabi_names): Add name for GDB_OSABI_PIKEOS. * arm-pikeos-tdep.c: New file. * configure.tgt: Add arm-pikeos-tdep.o to the case of ARM embedded system. * Makefile.in (ALL_TARGET_OBS): Add arm-pikeos-tdep.o. Tested on arm-pikeos and arm-elf using AdaCore's testsuite. We also evaluated it on armhf-linux as a cross platform.
673 lines
21 KiB
C++
673 lines
21 KiB
C++
/* *INDENT-OFF* */ /* ATTRIBUTE_PRINTF confuses indent, avoid running it
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for now. */
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/* Basic, host-specific, and target-specific definitions for GDB.
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Copyright (C) 1986-2018 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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||
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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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||
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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 DEFS_H
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#define DEFS_H
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#ifdef GDBSERVER
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# error gdbserver should not include gdb/defs.h
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#endif
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#include "common-defs.h"
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#include <sys/types.h>
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#include <limits.h>
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/* The libdecnumber library, on which GDB depends, includes a header file
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called gstdint.h instead of relying directly on stdint.h. GDB, on the
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other hand, includes stdint.h directly, relying on the fact that gnulib
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generates a copy if the system doesn't provide one or if it is missing
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some features. Unfortunately, gstdint.h and stdint.h cannot be included
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at the same time, which may happen when we include a file from
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libdecnumber.
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The following macro definition effectively prevents the inclusion of
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gstdint.h, as all the definitions it provides are guarded against
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the GCC_GENERATED_STDINT_H macro. We already have gnulib/stdint.h
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included, so it's ok to blank out gstdint.h. */
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#define GCC_GENERATED_STDINT_H 1
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#include <unistd.h>
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#include <fcntl.h>
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#include "gdb_wchar.h"
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#include "ui-file.h"
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#include "host-defs.h"
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#include "common/enum-flags.h"
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/* Scope types enumerator. List the types of scopes the compiler will
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accept. */
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enum compile_i_scope_types
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{
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COMPILE_I_INVALID_SCOPE,
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/* A simple scope. Wrap an expression into a simple scope that
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takes no arguments, returns no value, and uses the generic
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function name "_gdb_expr". */
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COMPILE_I_SIMPLE_SCOPE,
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/* Do not wrap the expression,
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it has to provide function "_gdb_expr" on its own. */
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COMPILE_I_RAW_SCOPE,
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/* A printable expression scope. Wrap an expression into a scope
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suitable for the "compile print" command. It uses the generic
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function name "_gdb_expr". COMPILE_I_PRINT_ADDRESS_SCOPE variant
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is the usual one, taking address of the object.
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COMPILE_I_PRINT_VALUE_SCOPE is needed for arrays where the array
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name already specifies its address. See get_out_value_type. */
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COMPILE_I_PRINT_ADDRESS_SCOPE,
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COMPILE_I_PRINT_VALUE_SCOPE,
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};
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template<typename T>
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using RequireLongest = gdb::Requires<gdb::Or<std::is_same<T, LONGEST>,
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std::is_same<T, ULONGEST>>>;
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/* Just in case they're not defined in stdio.h. */
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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#ifndef SEEK_CUR
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#define SEEK_CUR 1
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#endif
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/* The O_BINARY flag is defined in fcntl.h on some non-Posix platforms.
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It is used as an access modifier in calls to open(), where it acts
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similarly to the "b" character in fopen()'s MODE argument. On Posix
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platforms it should be a no-op, so it is defined as 0 here. This
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ensures that the symbol may be used freely elsewhere in gdb. */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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#include "hashtab.h"
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/* * Enable dbx commands if set. */
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extern int dbx_commands;
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/* * System root path, used to find libraries etc. */
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extern char *gdb_sysroot;
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/* * GDB datadir, used to store data files. */
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extern char *gdb_datadir;
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/* * If non-NULL, the possibly relocated path to python's "lib" directory
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specified with --with-python. */
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extern char *python_libdir;
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/* * Search path for separate debug files. */
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extern char *debug_file_directory;
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/* GDB's SIGINT handler basically sets a flag; code that might take a
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long time before it gets back to the event loop, and which ought to
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be interruptible, checks this flag using the QUIT macro, which, if
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GDB has the terminal, throws a quit exception.
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In addition to setting a flag, the SIGINT handler also marks a
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select/poll-able file descriptor as read-ready. That is used by
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interruptible_select in order to support interrupting blocking I/O
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in a race-free manner.
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These functions use the extension_language_ops API to allow extension
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language(s) and GDB SIGINT handling to coexist seamlessly. */
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/* * Evaluate to non-zero if the quit flag is set, zero otherwise. This
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will clear the quit flag as a side effect. */
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extern int check_quit_flag (void);
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/* * Set the quit flag. */
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extern void set_quit_flag (void);
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/* The current quit handler (and its type). This is called from the
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QUIT macro. See default_quit_handler below for default behavior.
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Parts of GDB temporarily override this to e.g., completely suppress
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Ctrl-C because it would not be safe to throw. E.g., normally, you
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wouldn't want to quit between a RSP command and its response, as
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that would break the communication with the target, but you may
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still want to intercept the Ctrl-C and offer to disconnect if the
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user presses Ctrl-C multiple times while the target is stuck
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waiting for the wedged remote stub. */
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typedef void (quit_handler_ftype) (void);
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extern quit_handler_ftype *quit_handler;
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/* The default quit handler. Checks whether Ctrl-C was pressed, and
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if so:
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- If GDB owns the terminal, throws a quit exception.
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- If GDB does not own the terminal, forwards the Ctrl-C to the
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target.
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*/
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extern void default_quit_handler (void);
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/* Flag that function quit should call quit_force. */
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extern volatile int sync_quit_force_run;
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extern void quit (void);
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/* Helper for the QUIT macro. */
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extern void maybe_quit (void);
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/* Check whether a Ctrl-C was typed, and if so, call the current quit
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handler. */
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#define QUIT maybe_quit ()
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/* Set the serial event associated with the quit flag. */
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extern void quit_serial_event_set (void);
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/* Clear the serial event associated with the quit flag. */
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extern void quit_serial_event_clear (void);
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/* * Languages represented in the symbol table and elsewhere.
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This should probably be in language.h, but since enum's can't
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be forward declared to satisfy opaque references before their
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actual definition, needs to be here.
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The constants here are in priority order. In particular,
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demangling is attempted according to this order.
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Note that there's ambiguity between the mangling schemes of some of
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these languages, so some symbols could be successfully demangled by
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several languages. For that reason, the constants here are sorted
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in the order we'll attempt demangling them. For example: Rust uses
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C++ mangling, so must come after C++; Ada must come last (see
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ada_sniff_from_mangled_name). (Keep this order in sync with the
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'languages' array in language.c.) */
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enum language
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{
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language_unknown, /* Language not known */
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language_auto, /* Placeholder for automatic setting */
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language_c, /* C */
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language_objc, /* Objective-C */
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language_cplus, /* C++ */
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language_d, /* D */
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language_go, /* Go */
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language_fortran, /* Fortran */
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language_m2, /* Modula-2 */
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language_asm, /* Assembly language */
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language_pascal, /* Pascal */
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language_opencl, /* OpenCL */
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language_rust, /* Rust */
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language_minimal, /* All other languages, minimal support only */
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language_ada, /* Ada */
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nr_languages
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};
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/* The number of bits needed to represent all languages, with enough
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padding to allow for reasonable growth. */
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#define LANGUAGE_BITS 5
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gdb_static_assert (nr_languages <= (1 << LANGUAGE_BITS));
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enum precision_type
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{
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single_precision,
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double_precision,
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unspecified_precision
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};
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/* * A generic, not quite boolean, enumeration. This is used for
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set/show commands in which the options are on/off/automatic. */
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enum auto_boolean
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{
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AUTO_BOOLEAN_TRUE,
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AUTO_BOOLEAN_FALSE,
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AUTO_BOOLEAN_AUTO
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};
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/* * Potential ways that a function can return a value of a given
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type. */
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enum return_value_convention
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{
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/* * Where the return value has been squeezed into one or more
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registers. */
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RETURN_VALUE_REGISTER_CONVENTION,
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/* * Commonly known as the "struct return convention". The caller
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passes an additional hidden first parameter to the caller. That
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parameter contains the address at which the value being returned
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should be stored. While typically, and historically, used for
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large structs, this is convention is applied to values of many
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different types. */
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RETURN_VALUE_STRUCT_CONVENTION,
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/* * Like the "struct return convention" above, but where the ABI
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guarantees that the called function stores the address at which
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the value being returned is stored in a well-defined location,
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such as a register or memory slot in the stack frame. Don't use
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this if the ABI doesn't explicitly guarantees this. */
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RETURN_VALUE_ABI_RETURNS_ADDRESS,
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/* * Like the "struct return convention" above, but where the ABI
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guarantees that the address at which the value being returned is
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stored will be available in a well-defined location, such as a
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register or memory slot in the stack frame. Don't use this if
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the ABI doesn't explicitly guarantees this. */
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RETURN_VALUE_ABI_PRESERVES_ADDRESS,
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};
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/* Needed for various prototypes */
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struct symtab;
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struct breakpoint;
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struct frame_info;
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struct gdbarch;
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struct value;
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/* From main.c. */
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/* This really belong in utils.c (path-utils.c?), but it references some
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globals that are currently only available to main.c. */
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extern char *relocate_gdb_directory (const char *initial, int flag);
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/* Annotation stuff. */
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extern int annotation_level; /* in stack.c */
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/* From regex.c or libc. BSD 4.4 declares this with the argument type as
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"const char *" in unistd.h, so we can't declare the argument
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as "char *". */
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EXTERN_C char *re_comp (const char *);
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/* From symfile.c */
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extern void symbol_file_command (const char *, int);
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/* * Remote targets may wish to use this as their load function. */
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extern void generic_load (const char *name, int from_tty);
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/* From top.c */
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typedef void initialize_file_ftype (void);
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extern char *gdb_readline_wrapper (const char *);
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extern char *command_line_input (const char *, const char *);
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extern void print_prompt (void);
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struct ui;
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extern int input_interactive_p (struct ui *);
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extern int info_verbose;
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/* From printcmd.c */
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extern void set_next_address (struct gdbarch *, CORE_ADDR);
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extern int print_address_symbolic (struct gdbarch *, CORE_ADDR,
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struct ui_file *, int,
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const char *);
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extern void print_address (struct gdbarch *, CORE_ADDR, struct ui_file *);
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extern const char *pc_prefix (CORE_ADDR);
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/* From exec.c */
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/* * Process memory area starting at ADDR with length SIZE. Area is
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readable iff READ is non-zero, writable if WRITE is non-zero,
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executable if EXEC is non-zero. Area is possibly changed against
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its original file based copy if MODIFIED is non-zero. DATA is
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passed without changes from a caller. */
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typedef int (*find_memory_region_ftype) (CORE_ADDR addr, unsigned long size,
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int read, int write, int exec,
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int modified, void *data);
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/* * Possible lvalue types. Like enum language, this should be in
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value.h, but needs to be here for the same reason. */
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enum lval_type
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{
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/* * Not an lval. */
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not_lval,
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/* * In memory. */
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lval_memory,
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/* * In a register. Registers are relative to a frame. */
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lval_register,
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/* * In a gdb internal variable. */
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lval_internalvar,
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/* * Value encapsulates a callable defined in an extension language. */
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lval_xcallable,
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/* * Part of a gdb internal variable (structure field). */
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lval_internalvar_component,
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/* * Value's bits are fetched and stored using functions provided
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by its creator. */
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lval_computed
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};
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/* * Parameters of the "info proc" command. */
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enum info_proc_what
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{
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/* * Display the default cmdline, cwd and exe outputs. */
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IP_MINIMAL,
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/* * Display `info proc mappings'. */
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IP_MAPPINGS,
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/* * Display `info proc status'. */
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IP_STATUS,
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/* * Display `info proc stat'. */
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IP_STAT,
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/* * Display `info proc cmdline'. */
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IP_CMDLINE,
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/* * Display `info proc exe'. */
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IP_EXE,
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/* * Display `info proc cwd'. */
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IP_CWD,
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/* * Display `info proc files'. */
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IP_FILES,
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/* * Display all of the above. */
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IP_ALL
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};
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/* * Default radixes for input and output. Only some values supported. */
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extern unsigned input_radix;
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extern unsigned output_radix;
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/* * Possibilities for prettyformat parameters to routines which print
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things. Like enum language, this should be in value.h, but needs
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to be here for the same reason. FIXME: If we can eliminate this
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as an arg to LA_VAL_PRINT, then we can probably move it back to
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value.h. */
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enum val_prettyformat
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{
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Val_no_prettyformat = 0,
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Val_prettyformat,
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/* * Use the default setting which the user has specified. */
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Val_prettyformat_default
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};
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/* * Optional native machine support. Non-native (and possibly pure
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multi-arch) targets do not need a "nm.h" file. This will be a
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symlink to one of the nm-*.h files, built by the `configure'
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script. */
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#ifdef GDB_NM_FILE
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#include "nm.h"
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#endif
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/* Assume that fopen accepts the letter "b" in the mode string.
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It is demanded by ISO C9X, and should be supported on all
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platforms that claim to have a standard-conforming C library. On
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true POSIX systems it will be ignored and have no effect. There
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may still be systems without a standard-conforming C library where
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an ISO C9X compiler (GCC) is available. Known examples are SunOS
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4.x and 4.3BSD. This assumption means these systems are no longer
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supported. */
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#ifndef FOPEN_RB
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# include "fopen-bin.h"
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#endif
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/* Defaults for system-wide constants (if not defined by xm.h, we fake it).
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FIXME: Assumes 2's complement arithmetic. */
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#if !defined (UINT_MAX)
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#define UINT_MAX ((unsigned int)(~0)) /* 0xFFFFFFFF for 32-bits */
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#endif
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#if !defined (INT_MAX)
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#define INT_MAX ((int)(UINT_MAX >> 1)) /* 0x7FFFFFFF for 32-bits */
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#endif
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#if !defined (INT_MIN)
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#define INT_MIN ((int)((int) ~0 ^ INT_MAX)) /* 0x80000000 for 32-bits */
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#endif
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#if !defined (ULONG_MAX)
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#define ULONG_MAX ((unsigned long)(~0L)) /* 0xFFFFFFFF for 32-bits */
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#endif
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#if !defined (LONG_MAX)
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#define LONG_MAX ((long)(ULONG_MAX >> 1)) /* 0x7FFFFFFF for 32-bits */
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#endif
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#if !defined (ULONGEST_MAX)
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#define ULONGEST_MAX (~(ULONGEST)0) /* 0xFFFFFFFFFFFFFFFF for 64-bits */
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#endif
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#if !defined (LONGEST_MAX) /* 0x7FFFFFFFFFFFFFFF for 64-bits */
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#define LONGEST_MAX ((LONGEST)(ULONGEST_MAX >> 1))
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#endif
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/* * Convert a LONGEST to an int. This is used in contexts (e.g. number of
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arguments to a function, number in a value history, register number, etc.)
|
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where the value must not be larger than can fit in an int. */
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|
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extern int longest_to_int (LONGEST);
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||
|
||
/* * List of known OS ABIs. If you change this, make sure to update the
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||
table in osabi.c. */
|
||
enum gdb_osabi
|
||
{
|
||
GDB_OSABI_UNKNOWN = 0, /* keep this zero */
|
||
GDB_OSABI_NONE,
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||
|
||
GDB_OSABI_SVR4,
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||
GDB_OSABI_HURD,
|
||
GDB_OSABI_SOLARIS,
|
||
GDB_OSABI_LINUX,
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||
GDB_OSABI_FREEBSD,
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||
GDB_OSABI_NETBSD,
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||
GDB_OSABI_OPENBSD,
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GDB_OSABI_WINCE,
|
||
GDB_OSABI_GO32,
|
||
GDB_OSABI_QNXNTO,
|
||
GDB_OSABI_CYGWIN,
|
||
GDB_OSABI_AIX,
|
||
GDB_OSABI_DICOS,
|
||
GDB_OSABI_DARWIN,
|
||
GDB_OSABI_SYMBIAN,
|
||
GDB_OSABI_OPENVMS,
|
||
GDB_OSABI_LYNXOS178,
|
||
GDB_OSABI_NEWLIB,
|
||
GDB_OSABI_SDE,
|
||
GDB_OSABI_PIKEOS,
|
||
|
||
GDB_OSABI_INVALID /* keep this last */
|
||
};
|
||
|
||
/* Enumerate the requirements a symbol has in order to be evaluated.
|
||
These are listed in order of "strength" -- a later entry subsumes
|
||
earlier ones. This fine-grained distinction is important because
|
||
it allows for the evaluation of a TLS symbol during unwinding --
|
||
when unwinding one has access to registers, but not the frame
|
||
itself, because that is being constructed. */
|
||
|
||
enum symbol_needs_kind
|
||
{
|
||
/* No special requirements -- just memory. */
|
||
SYMBOL_NEEDS_NONE,
|
||
|
||
/* The symbol needs registers. */
|
||
SYMBOL_NEEDS_REGISTERS,
|
||
|
||
/* The symbol needs a frame. */
|
||
SYMBOL_NEEDS_FRAME
|
||
};
|
||
|
||
/* Dynamic target-system-dependent parameters for GDB. */
|
||
#include "gdbarch.h"
|
||
|
||
/* In findvar.c. */
|
||
|
||
template<typename T, typename = RequireLongest<T>>
|
||
T extract_integer (const gdb_byte *addr, int len, enum bfd_endian byte_order);
|
||
|
||
static inline LONGEST
|
||
extract_signed_integer (const gdb_byte *addr, int len,
|
||
enum bfd_endian byte_order)
|
||
{
|
||
return extract_integer<LONGEST> (addr, len, byte_order);
|
||
}
|
||
|
||
static inline ULONGEST
|
||
extract_unsigned_integer (const gdb_byte *addr, int len,
|
||
enum bfd_endian byte_order)
|
||
{
|
||
return extract_integer<ULONGEST> (addr, len, byte_order);
|
||
}
|
||
|
||
extern int extract_long_unsigned_integer (const gdb_byte *, int,
|
||
enum bfd_endian, LONGEST *);
|
||
|
||
extern CORE_ADDR extract_typed_address (const gdb_byte *buf,
|
||
struct type *type);
|
||
|
||
/* All 'store' functions accept a host-format integer and store a
|
||
target-format integer at ADDR which is LEN bytes long. */
|
||
|
||
template<typename T, typename = RequireLongest<T>>
|
||
extern void store_integer (gdb_byte *addr, int len, enum bfd_endian byte_order,
|
||
T val);
|
||
|
||
static inline void
|
||
store_signed_integer (gdb_byte *addr, int len,
|
||
enum bfd_endian byte_order, LONGEST val)
|
||
{
|
||
return store_integer (addr, len, byte_order, val);
|
||
}
|
||
|
||
static inline void
|
||
store_unsigned_integer (gdb_byte *addr, int len,
|
||
enum bfd_endian byte_order, ULONGEST val)
|
||
{
|
||
return store_integer (addr, len, byte_order, val);
|
||
}
|
||
|
||
extern void store_typed_address (gdb_byte *buf, struct type *type,
|
||
CORE_ADDR addr);
|
||
|
||
extern void copy_integer_to_size (gdb_byte *dest, int dest_size,
|
||
const gdb_byte *source, int source_size,
|
||
bool is_signed, enum bfd_endian byte_order);
|
||
|
||
/* From valops.c */
|
||
|
||
extern int watchdog;
|
||
|
||
/* From dwarf2read.c */
|
||
|
||
ULONGEST read_unsigned_leb128 (bfd *, const gdb_byte *, unsigned int *);
|
||
|
||
/* Hooks for alternate command interfaces. */
|
||
|
||
/* * The name of the interpreter if specified on the command line. */
|
||
extern char *interpreter_p;
|
||
|
||
struct target_waitstatus;
|
||
struct cmd_list_element;
|
||
|
||
extern void (*deprecated_pre_add_symbol_hook) (const char *);
|
||
extern void (*deprecated_post_add_symbol_hook) (void);
|
||
extern void (*selected_frame_level_changed_hook) (int);
|
||
extern int (*deprecated_ui_loop_hook) (int signo);
|
||
extern void (*deprecated_show_load_progress) (const char *section,
|
||
unsigned long section_sent,
|
||
unsigned long section_size,
|
||
unsigned long total_sent,
|
||
unsigned long total_size);
|
||
extern void (*deprecated_print_frame_info_listing_hook) (struct symtab * s,
|
||
int line,
|
||
int stopline,
|
||
int noerror);
|
||
extern int (*deprecated_query_hook) (const char *, va_list)
|
||
ATTRIBUTE_FPTR_PRINTF(1,0);
|
||
extern void (*deprecated_warning_hook) (const char *, va_list)
|
||
ATTRIBUTE_FPTR_PRINTF(1,0);
|
||
extern void (*deprecated_interactive_hook) (void);
|
||
extern void (*deprecated_readline_begin_hook) (const char *, ...)
|
||
ATTRIBUTE_FPTR_PRINTF_1;
|
||
extern char *(*deprecated_readline_hook) (const char *);
|
||
extern void (*deprecated_readline_end_hook) (void);
|
||
extern void (*deprecated_context_hook) (int);
|
||
extern ptid_t (*deprecated_target_wait_hook) (ptid_t ptid,
|
||
struct target_waitstatus *status,
|
||
int options);
|
||
|
||
extern void (*deprecated_attach_hook) (void);
|
||
extern void (*deprecated_detach_hook) (void);
|
||
extern void (*deprecated_call_command_hook) (struct cmd_list_element * c,
|
||
const char *cmd, int from_tty);
|
||
|
||
extern int (*deprecated_ui_load_progress_hook) (const char *section,
|
||
unsigned long num);
|
||
|
||
/* If this definition isn't overridden by the header files, assume
|
||
that isatty and fileno exist on this system. */
|
||
#ifndef ISATTY
|
||
#define ISATTY(FP) (isatty (fileno (FP)))
|
||
#endif
|
||
|
||
/* * A width that can achieve a better legibility for GDB MI mode. */
|
||
#define GDB_MI_MSG_WIDTH 80
|
||
|
||
/* From progspace.c */
|
||
|
||
extern void initialize_progspace (void);
|
||
extern void initialize_inferiors (void);
|
||
|
||
/* * Special block numbers */
|
||
|
||
enum block_enum
|
||
{
|
||
GLOBAL_BLOCK = 0,
|
||
STATIC_BLOCK = 1,
|
||
FIRST_LOCAL_BLOCK = 2
|
||
};
|
||
|
||
/* User selection used in observable.h and multiple print functions. */
|
||
|
||
enum user_selected_what_flag
|
||
{
|
||
/* Inferior selected. */
|
||
USER_SELECTED_INFERIOR = 1 << 1,
|
||
|
||
/* Thread selected. */
|
||
USER_SELECTED_THREAD = 1 << 2,
|
||
|
||
/* Frame selected. */
|
||
USER_SELECTED_FRAME = 1 << 3
|
||
};
|
||
DEF_ENUM_FLAGS_TYPE (enum user_selected_what_flag, user_selected_what);
|
||
|
||
#include "utils.h"
|
||
|
||
#endif /* #ifndef DEFS_H */
|