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