Update debugbreak for support PowerPC target.
--HG-- branch : release
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@ -1,4 +1,4 @@
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/* Copyright (c) 2011-2015, Scott Tsai
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/* Copyright (c) 2011-2018, Scott Tsai
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*
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*
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* All rights reserved.
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* All rights reserved.
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*
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*
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@ -33,27 +33,22 @@
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#else
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#else
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#include <signal.h>
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#ifdef __cplusplus
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#ifdef __cplusplus
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extern "C" {
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extern "C" {
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#endif
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#endif
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enum {
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#define DEBUG_BREAK_USE_TRAP_INSTRUCTION 1
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/* gcc optimizers consider code after __builtin_trap() dead.
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#define DEBUG_BREAK_USE_BULTIN_TRAP 2
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* Making __builtin_trap() unsuitable for breaking into the debugger */
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#define DEBUG_BREAK_USE_SIGTRAP 3
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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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#if defined(__i386__) || defined(__x86_64__)
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enum { HAVE_TRAP_INSTRUCTION = 1 };
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_TRAP_INSTRUCTION
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__attribute__((gnu_inline, always_inline))
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__inline__ static void trap_instruction(void)
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__inline__ static void trap_instruction(void)
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{
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{
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__asm__ volatile("int $0x03");
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__asm__ volatile("int $0x03");
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}
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}
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#elif defined(__thumb__)
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#elif defined(__thumb__)
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enum { HAVE_TRAP_INSTRUCTION = 1, };
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_TRAP_INSTRUCTION
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/* FIXME: handle __THUMB_INTERWORK__ */
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/* FIXME: handle __THUMB_INTERWORK__ */
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__attribute__((gnu_inline, always_inline))
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__attribute__((gnu_inline, always_inline))
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__inline__ static void trap_instruction(void)
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__inline__ static void trap_instruction(void)
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@ -69,30 +64,37 @@ __inline__ static void trap_instruction(void)
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#endif
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#endif
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/* Known problem:
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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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* 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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* 'step' would keep getting stuck on the same instruction.
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*
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*
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* Workaround: a new GDB command,
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* Workaround: use the new GDB commands 'debugbreak-step' and
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* 'debugbreak-step' is defined in debugbreak-gdb.py
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* 'debugbreak-continue' that become available
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* that does:
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* after you source the script from GDB:
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*
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* $ gdb -x debugbreak-gdb.py <... USUAL ARGUMENTS ...>
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*
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* 'debugbreak-step' would jump over the breakpoint instruction with
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* roughly equivalent of:
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* (gdb) set $instruction_len = 2
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* (gdb) set $instruction_len = 2
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* (gdb) tbreak *($pc + $instruction_len)
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* (gdb) tbreak *($pc + $instruction_len)
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* (gdb) jump *($pc + $instruction_len)
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* (gdb) jump *($pc + $instruction_len)
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*/
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*/
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}
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}
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#elif defined(__arm__) && !defined(__thumb__)
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#elif defined(__arm__) && !defined(__thumb__)
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enum { HAVE_TRAP_INSTRUCTION = 1 };
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_TRAP_INSTRUCTION
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__attribute__((gnu_inline, always_inline))
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__attribute__((gnu_inline, always_inline))
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__inline__ static void trap_instruction(void)
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__inline__ static void trap_instruction(void)
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{
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{
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/* See 'arm-linux-tdep.c' in GDB source,
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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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* 'eabi_linux_arm_le_breakpoint' */
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__asm__ volatile(".inst 0xe7f001f0");
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__asm__ volatile(".inst 0xe7f001f0");
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/* Has same known problem and workaround
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/* Known problem:
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* as Thumb mode */
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* Same problem and workaround as Thumb mode */
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}
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}
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#elif defined(__aarch64__) && defined(__APPLE__)
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_BULTIN_TRAP
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#elif defined(__aarch64__)
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#elif defined(__aarch64__)
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enum { HAVE_TRAP_INSTRUCTION = 1 };
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_TRAP_INSTRUCTION
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__attribute__((gnu_inline, always_inline))
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__attribute__((gnu_inline, always_inline))
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__inline__ static void trap_instruction(void)
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__inline__ static void trap_instruction(void)
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{
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{
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@ -100,42 +102,57 @@ __inline__ static void trap_instruction(void)
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* 'aarch64_default_breakpoint' */
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* 'aarch64_default_breakpoint' */
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__asm__ volatile(".inst 0xd4200000");
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__asm__ volatile(".inst 0xd4200000");
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}
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}
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#elif defined(__powerpc__)
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/* PPC 32 or 64-bit, big or little endian */
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_TRAP_INSTRUCTION
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__attribute__((gnu_inline, always_inline))
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__inline__ static void trap_instruction(void)
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{
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/* See 'rs6000-tdep.c' in GDB source,
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* 'rs6000_breakpoint' */
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__asm__ volatile(".4byte 0x7d821008");
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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 ("twge r2,r2").
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*
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* The workaround is the same as ARM Thumb mode: use debugbreak-gdb.py
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* or manually jump over the instruction. */
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}
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#else
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#else
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enum { HAVE_TRAP_INSTRUCTION = 0 };
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#define DEBUG_BREAK_IMPL DEBUG_BREAK_USE_SIGTRAP
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#endif
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#endif
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#ifndef DEBUG_BREAK_IMPL
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#error "debugbreak.h is not supported on this target"
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#elif DEBUG_BREAK_IMPL == DEBUG_BREAK_USE_TRAP_INSTRUCTION
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__attribute__((gnu_inline, always_inline))
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__attribute__((gnu_inline, always_inline))
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__inline__ static void debug_break(void)
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__inline__ static void debug_break(void)
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{
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{
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#if defined(_WIN32) || defined(_WIN64)
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trap_instruction();
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/* SIGTRAP available only on POSIX-compliant operating systems
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* use builtin trap instead */
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HAVE_TRAP_INSTRUCTION ? trap_instruction() : __builtin_trap();
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#else
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// cppcheck-suppress knownConditionTrueFalse
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if (HAVE_TRAP_INSTRUCTION)
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{
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trap_instruction();
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}
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// cppcheck-suppress knownConditionTrueFalse
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else if (DEBUG_BREAK_PREFER_BUILTIN_TRAP_TO_SIGTRAP)
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{
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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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}
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else
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{
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raise(SIGTRAP);
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}
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#endif
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}
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}
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#elif DEBUG_BREAK_IMPL == DEBUG_BREAK_USE_BULTIN_TRAP
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__attribute__((gnu_inline, always_inline))
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__inline__ static void debug_break(void)
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{
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__builtin_trap();
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}
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#elif DEBUG_BREAK_IMPL == DEBUG_BREAK_USE_SIGTRAP
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#include <signal.h>
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__attribute__((gnu_inline, always_inline))
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__inline__ static void debug_break(void)
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{
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raise(SIGTRAP);
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}
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#else
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#error "invalid DEBUG_BREAK_IMPL value"
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#endif
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#ifdef __cplusplus
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#ifdef __cplusplus
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}
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}
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#endif
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#endif
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#endif
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#endif /* ifdef _MSC_VER */
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#endif
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#endif /* ifndef DEBUG_BREAK_H */
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