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121 lines
3.6 KiB
121 lines
3.6 KiB
/* Copyright (c) 2013, Scott Tsai
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef DEBUG_BREAK_H
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#define DEBUG_BREAK_H
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#if defined(_MSC_VER) || defined(__MINGW32__)
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#define debug_break __debugbreak
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#else
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#include <signal.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum {
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/* gcc optimizers consider code after __builtin_trap() dead.
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* Making __builtin_trap() unsuitable for breaking into the debugger */
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DEBUG_BREAK_PREFER_BUILTIN_TRAP_TO_SIGTRAP = 0,
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};
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#if defined(__i386__) || defined(__x86_64__)
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enum { HAVE_TRAP_INSTRUCTION = 1, };
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__attribute__((gnu_inline, always_inline))
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static void __inline__ trap_instruction(void)
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{
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__asm__ volatile("int $0x03");
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}
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#elif defined(__thumb__)
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enum { HAVE_TRAP_INSTRUCTION = 1, };
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/* FIXME: handle __THUMB_INTERWORK__ */
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__attribute__((gnu_inline, always_inline))
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static void __inline__ trap_instruction(void)
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{
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/* See 'arm-linux-tdep.c' in GDB source.
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* Both instruction sequences below works. */
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#if 1
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/* 'eabi_linux_thumb_le_breakpoint' */
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__asm__ volatile(".inst 0xde01");
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#else
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/* 'eabi_linux_thumb2_le_breakpoint' */
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__asm__ volatile(".inst.w 0xf7f0a000");
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#endif
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/* Known problem:
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* After a breakpoint hit, can't stepi, step, or continue in GDB.
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* 'step' stuck on the same instruction.
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*
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* Workaround: a new GDB command,
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* 'debugbreak-step' is defined in debugbreak-gdb.py
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* that does:
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* (gdb) set $instruction_len = 2
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* (gdb) tbreak *($pc + $instruction_len)
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* (gdb) jump *($pc + $instruction_len)
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*/
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}
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#elif defined(__arm__) && !defined(__thumb__)
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enum { HAVE_TRAP_INSTRUCTION = 1, };
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__attribute__((gnu_inline, always_inline))
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static void __inline__ trap_instruction(void)
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{
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/* See 'arm-linux-tdep.c' in GDB source,
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* 'eabi_linux_arm_le_breakpoint' */
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__asm__ volatile(".inst 0xe7f001f0");
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/* Has same known problem and workaround
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* as Thumb mode */
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}
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#else
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enum { HAVE_TRAP_INSTRUCTION = 0, };
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#endif
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__attribute__((gnu_inline, always_inline))
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static void __inline__ debug_break(void)
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{
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if (HAVE_TRAP_INSTRUCTION) {
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trap_instruction();
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} else if (DEBUG_BREAK_PREFER_BUILTIN_TRAP_TO_SIGTRAP) {
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/* raises SIGILL on Linux x86{,-64}, to continue in gdb:
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* (gdb) handle SIGILL stop nopass
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* */
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__builtin_trap();
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} else {
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raise(SIGTRAP);
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}
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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#endif
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