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/* DWARF2 EH unwinding support for AMD x86-64 and x86.
Copyright (C) 2009 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 3, or (at your option)
any later version.
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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* Do code reading to identify a signal frame, and set the frame
state data appropriately. See unwind-dw2.c for the structs. */
#include <ucontext.h>
#ifdef __x86_64__
#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;
mcontext_t *mctx;
long new_cfa;
if (/* Solaris 2.10
------------
<__sighndlr+0>: push %rbp
<__sighndlr+1>: mov %rsp,%rbp
<__sighndlr+4>: callq *%rcx
<__sighndlr+6>: leaveq <--- PC
<__sighndlr+7>: retq */
*(unsigned long *)(pc - 6) == 0xc3c9d1ffe5894855)
/* We need to move up four frames (the kernel frame, the signal frame,
the call_user_handler frame and the __sighndlr frame). Two of them
have the minimum stack frame size (kernel and __sighndlr frames),
the signal frame has a stack frame size of 32 and there is another
with a stack frame size of 112 bytes (the call_user_handler frame).
The ucontext_t structure is after this offset. */
{
int off = 16 + 16 + 32 + 112;
mctx = &((ucontext_t *) (context->cfa + off))->uc_mcontext;
}
else
return _URC_END_OF_STACK;
new_cfa = mctx->gregs[REG_RSP];
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 7;
fs->regs.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)&mctx->gregs[REG_RAX] - new_cfa;
fs->regs.reg[1].how = REG_SAVED_OFFSET;
fs->regs.reg[1].loc.offset = (long)&mctx->gregs[REG_RDX] - new_cfa;
fs->regs.reg[2].how = REG_SAVED_OFFSET;
fs->regs.reg[2].loc.offset = (long)&mctx->gregs[REG_RCX] - new_cfa;
fs->regs.reg[3].how = REG_SAVED_OFFSET;
fs->regs.reg[3].loc.offset = (long)&mctx->gregs[REG_RBX] - new_cfa;
fs->regs.reg[4].how = REG_SAVED_OFFSET;
fs->regs.reg[4].loc.offset = (long)&mctx->gregs[REG_RSI] - new_cfa;
fs->regs.reg[5].how = REG_SAVED_OFFSET;
fs->regs.reg[5].loc.offset = (long)&mctx->gregs[REG_RDI] - new_cfa;
fs->regs.reg[6].how = REG_SAVED_OFFSET;
fs->regs.reg[6].loc.offset = (long)&mctx->gregs[REG_RBP] - new_cfa;
fs->regs.reg[8].how = REG_SAVED_OFFSET;
fs->regs.reg[8].loc.offset = (long)&mctx->gregs[REG_R8] - new_cfa;
fs->regs.reg[9].how = REG_SAVED_OFFSET;
fs->regs.reg[9].loc.offset = (long)&mctx->gregs[REG_R9] - new_cfa;
fs->regs.reg[10].how = REG_SAVED_OFFSET;
fs->regs.reg[10].loc.offset = (long)&mctx->gregs[REG_R10] - new_cfa;
fs->regs.reg[11].how = REG_SAVED_OFFSET;
fs->regs.reg[11].loc.offset = (long)&mctx->gregs[REG_R11] - new_cfa;
fs->regs.reg[12].how = REG_SAVED_OFFSET;
fs->regs.reg[12].loc.offset = (long)&mctx->gregs[REG_R12] - new_cfa;
fs->regs.reg[13].how = REG_SAVED_OFFSET;
fs->regs.reg[13].loc.offset = (long)&mctx->gregs[REG_R13] - new_cfa;
fs->regs.reg[14].how = REG_SAVED_OFFSET;
fs->regs.reg[14].loc.offset = (long)&mctx->gregs[REG_R14] - new_cfa;
fs->regs.reg[15].how = REG_SAVED_OFFSET;
fs->regs.reg[15].loc.offset = (long)&mctx->gregs[REG_R15] - new_cfa;
fs->regs.reg[16].how = REG_SAVED_OFFSET;
fs->regs.reg[16].loc.offset = (long)&mctx->gregs[REG_RIP] - new_cfa;
fs->retaddr_column = 16;
fs->signal_frame = 1;
return _URC_NO_REASON;
}
#else
#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;
mcontext_t *mctx;
long new_cfa;
if (/* Solaris 2.8 - single thread
-------------------------
<sigacthandler+17>: mov 0x10(%ebp),%esi
<sigacthandler+20>: push %esi
<sigacthandler+21>: pushl 0xc(%ebp)
<sigacthandler+24>: mov 0x8(%ebp),%ecx
<sigacthandler+27>: push %ecx
<sigacthandler+28>: mov offset(%ebx),%eax
<sigacthandler+34>: call *(%eax,%ecx,4)
<sigacthandler+37>: add $0xc,%esp <--- PC
<sigacthandler+40>: push %esi ... */
(*(unsigned long *)(pc - 20) == 0x5610758b
&& *(unsigned long *)(pc - 16) == 0x8b0c75ff
&& *(unsigned long *)(pc - 12) == 0x8b51084d
&& *(unsigned char *)(pc - 8) == 0x83
&& *(unsigned long *)(pc - 4) == 0x8814ff00
&& *(unsigned long *)(pc - 0) == 0x560cc483)
|| /* Solaris 2.8 - multi thread
---------------------------
<__sighndlr+0>: push %ebp
<__sighndlr+1>: mov %esp,%ebp
<__sighndlr+3>: pushl 0x10(%ebp)
<__sighndlr+6>: pushl 0xc(%ebp)
<__sighndlr+9>: pushl 0x8(%ebp)
<__sighndlr+12>: call *0x14(%ebp)
<__sighndlr+15>: leave <--- PC */
(*(unsigned long *)(pc - 15) == 0xffec8b55
&& *(unsigned long *)(pc - 11) == 0x75ff1075
&& *(unsigned long *)(pc - 7) == 0x0875ff0c
&& *(unsigned long *)(pc - 3) == 0xc91455ff)
|| /* Solaris 2.10
------------
<__sighndlr+0>: push %ebp
<__sighndlr+1>: mov %esp,%ebp
<__sighndlr+3>: pushl 0x10(%ebp)
<__sighndlr+6>: pushl 0xc(%ebp)
<__sighndlr+9>: pushl 0x8(%ebp)
<__sighndlr+12>: call *0x14(%ebp)
<__sighndlr+15>: add $0xc,%esp <--- PC
<__sighndlr+18>: leave
<__sighndlr+19>: ret */
(*(unsigned long *)(pc - 15) == 0xffec8b55
&& *(unsigned long *)(pc - 11) == 0x75ff1075
&& *(unsigned long *)(pc - 7) == 0x0875ff0c
&& *(unsigned long *)(pc - 3) == 0x831455ff
&& *(unsigned long *)(pc + 1) == 0xc3c90cc4))
{
struct handler_args {
int signo;
siginfo_t *sip;
ucontext_t *ucontext;
} *handler_args = context->cfa;
mctx = &handler_args->ucontext->uc_mcontext;
}
else
return _URC_END_OF_STACK;
new_cfa = mctx->gregs[UESP];
fs->regs.cfa_how = CFA_REG_OFFSET;
fs->regs.cfa_reg = 4;
fs->regs.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)&mctx->gregs[EAX] - new_cfa;
fs->regs.reg[3].how = REG_SAVED_OFFSET;
fs->regs.reg[3].loc.offset = (long)&mctx->gregs[EBX] - new_cfa;
fs->regs.reg[1].how = REG_SAVED_OFFSET;
fs->regs.reg[1].loc.offset = (long)&mctx->gregs[ECX] - new_cfa;
fs->regs.reg[2].how = REG_SAVED_OFFSET;
fs->regs.reg[2].loc.offset = (long)&mctx->gregs[EDX] - new_cfa;
fs->regs.reg[6].how = REG_SAVED_OFFSET;
fs->regs.reg[6].loc.offset = (long)&mctx->gregs[ESI] - new_cfa;
fs->regs.reg[7].how = REG_SAVED_OFFSET;
fs->regs.reg[7].loc.offset = (long)&mctx->gregs[EDI] - new_cfa;
fs->regs.reg[5].how = REG_SAVED_OFFSET;
fs->regs.reg[5].loc.offset = (long)&mctx->gregs[EBP] - new_cfa;
fs->regs.reg[8].how = REG_SAVED_OFFSET;
fs->regs.reg[8].loc.offset = (long)&mctx->gregs[EIP] - new_cfa;
fs->retaddr_column = 8;
fs->signal_frame = 1;
return _URC_NO_REASON;
}
#endif
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