182 lines
6.7 KiB
C
182 lines
6.7 KiB
C
/* DWARF2 EH unwinding support for AMD x86-64 and x86.
|
|
Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
In addition to the permissions in the GNU General Public License, the
|
|
Free Software Foundation gives you unlimited permission to link the
|
|
compiled version of this file with other programs, and to distribute
|
|
those programs without any restriction coming from the use of this
|
|
file. (The General Public License restrictions do apply in other
|
|
respects; for example, they cover modification of the file, and
|
|
distribution when not linked into another program.)
|
|
|
|
GCC is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with GCC; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 51 Franklin Street, Fifth Floor,
|
|
Boston, MA 02110-1301, USA. */
|
|
|
|
/* Do code reading to identify a signal frame, and set the frame
|
|
state data appropriately. See unwind-dw2.c for the structs.
|
|
Don't use this at all if inhibit_libc is used. */
|
|
|
|
#ifndef inhibit_libc
|
|
|
|
#ifdef __x86_64__
|
|
|
|
#include <signal.h>
|
|
#include <sys/ucontext.h>
|
|
|
|
#define MD_FALLBACK_FRAME_STATE_FOR x86_64_fallback_frame_state
|
|
|
|
static _Unwind_Reason_Code
|
|
x86_64_fallback_frame_state (struct _Unwind_Context *context,
|
|
_Unwind_FrameState *fs)
|
|
{
|
|
unsigned char *pc = context->ra;
|
|
struct sigcontext *sc;
|
|
long new_cfa;
|
|
|
|
/* movq __NR_rt_sigreturn, %rax ; syscall */
|
|
if (*(unsigned char *)(pc+0) == 0x48
|
|
&& *(unsigned long *)(pc+1) == 0x050f0000000fc0c7)
|
|
{
|
|
struct ucontext *uc_ = context->cfa;
|
|
/* The void * cast is necessary to avoid an aliasing warning.
|
|
The aliasing warning is correct, but should not be a problem
|
|
because it does not alias anything. */
|
|
sc = (struct sigcontext *) (void *) &uc_->uc_mcontext;
|
|
}
|
|
else
|
|
return _URC_END_OF_STACK;
|
|
|
|
new_cfa = sc->rsp;
|
|
fs->cfa_how = CFA_REG_OFFSET;
|
|
/* Register 7 is rsp */
|
|
fs->cfa_reg = 7;
|
|
fs->cfa_offset = new_cfa - (long) context->cfa;
|
|
|
|
/* The SVR4 register numbering macros aren't usable in libgcc. */
|
|
fs->regs.reg[0].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[0].loc.offset = (long)&sc->rax - new_cfa;
|
|
fs->regs.reg[1].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[1].loc.offset = (long)&sc->rdx - new_cfa;
|
|
fs->regs.reg[2].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[2].loc.offset = (long)&sc->rcx - new_cfa;
|
|
fs->regs.reg[3].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[3].loc.offset = (long)&sc->rbx - new_cfa;
|
|
fs->regs.reg[4].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[4].loc.offset = (long)&sc->rsi - new_cfa;
|
|
fs->regs.reg[5].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[5].loc.offset = (long)&sc->rdi - new_cfa;
|
|
fs->regs.reg[6].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[6].loc.offset = (long)&sc->rbp - new_cfa;
|
|
fs->regs.reg[8].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[8].loc.offset = (long)&sc->r8 - new_cfa;
|
|
fs->regs.reg[9].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[9].loc.offset = (long)&sc->r9 - new_cfa;
|
|
fs->regs.reg[10].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[10].loc.offset = (long)&sc->r10 - new_cfa;
|
|
fs->regs.reg[11].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[11].loc.offset = (long)&sc->r11 - new_cfa;
|
|
fs->regs.reg[12].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[12].loc.offset = (long)&sc->r12 - new_cfa;
|
|
fs->regs.reg[13].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[13].loc.offset = (long)&sc->r13 - new_cfa;
|
|
fs->regs.reg[14].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[14].loc.offset = (long)&sc->r14 - new_cfa;
|
|
fs->regs.reg[15].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[15].loc.offset = (long)&sc->r15 - new_cfa;
|
|
fs->regs.reg[16].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[16].loc.offset = (long)&sc->rip - new_cfa;
|
|
fs->retaddr_column = 16;
|
|
fs->signal_frame = 1;
|
|
return _URC_NO_REASON;
|
|
}
|
|
|
|
#else /* ifdef __x86_64__ */
|
|
|
|
/* There's no sys/ucontext.h for glibc 2.0, so no
|
|
signal-turned-exceptions for them. There's also no configure-run for
|
|
the target, so we can't check on (e.g.) HAVE_SYS_UCONTEXT_H. Using the
|
|
target libc version macro should be enough. */
|
|
#if !(__GLIBC__ == 2 && __GLIBC_MINOR__ == 0)
|
|
|
|
#include <signal.h>
|
|
#include <sys/ucontext.h>
|
|
|
|
#define MD_FALLBACK_FRAME_STATE_FOR x86_fallback_frame_state
|
|
|
|
static _Unwind_Reason_Code
|
|
x86_fallback_frame_state (struct _Unwind_Context *context,
|
|
_Unwind_FrameState *fs)
|
|
{
|
|
unsigned char *pc = context->ra;
|
|
struct sigcontext *sc;
|
|
long new_cfa;
|
|
|
|
/* popl %eax ; movl $__NR_sigreturn,%eax ; int $0x80 */
|
|
if (*(unsigned short *)(pc+0) == 0xb858
|
|
&& *(unsigned int *)(pc+2) == 119
|
|
&& *(unsigned short *)(pc+6) == 0x80cd)
|
|
sc = context->cfa + 4;
|
|
/* movl $__NR_rt_sigreturn,%eax ; int $0x80 */
|
|
else if (*(unsigned char *)(pc+0) == 0xb8
|
|
&& *(unsigned int *)(pc+1) == 173
|
|
&& *(unsigned short *)(pc+5) == 0x80cd)
|
|
{
|
|
struct rt_sigframe {
|
|
int sig;
|
|
struct siginfo *pinfo;
|
|
void *puc;
|
|
struct siginfo info;
|
|
struct ucontext uc;
|
|
} *rt_ = context->cfa;
|
|
/* The void * cast is necessary to avoid an aliasing warning.
|
|
The aliasing warning is correct, but should not be a problem
|
|
because it does not alias anything. */
|
|
sc = (struct sigcontext *) (void *) &rt_->uc.uc_mcontext;
|
|
}
|
|
else
|
|
return _URC_END_OF_STACK;
|
|
|
|
new_cfa = sc->REG_NAME(esp);
|
|
fs->cfa_how = CFA_REG_OFFSET;
|
|
fs->cfa_reg = 4;
|
|
fs->cfa_offset = new_cfa - (long) context->cfa;
|
|
|
|
/* The SVR4 register numbering macros aren't usable in libgcc. */
|
|
fs->regs.reg[0].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[0].loc.offset = (long)&sc->REG_NAME(eax) - new_cfa;
|
|
fs->regs.reg[3].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[3].loc.offset = (long)&sc->REG_NAME(ebx) - new_cfa;
|
|
fs->regs.reg[1].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[1].loc.offset = (long)&sc->REG_NAME(ecx) - new_cfa;
|
|
fs->regs.reg[2].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[2].loc.offset = (long)&sc->REG_NAME(edx) - new_cfa;
|
|
fs->regs.reg[6].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[6].loc.offset = (long)&sc->REG_NAME(esi) - new_cfa;
|
|
fs->regs.reg[7].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[7].loc.offset = (long)&sc->REG_NAME(edi) - new_cfa;
|
|
fs->regs.reg[5].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[5].loc.offset = (long)&sc->REG_NAME(ebp) - new_cfa;
|
|
fs->regs.reg[8].how = REG_SAVED_OFFSET;
|
|
fs->regs.reg[8].loc.offset = (long)&sc->REG_NAME(eip) - new_cfa;
|
|
fs->retaddr_column = 8;
|
|
fs->signal_frame = 1;
|
|
return _URC_NO_REASON;
|
|
}
|
|
#endif /* not glibc 2.0 */
|
|
#endif /* ifdef __x86_64__ */
|
|
#endif /* ifdef inhibit_libc */
|