--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/config/i386/linux-unwind.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,177 @@
+/* DWARF2 EH unwinding support for AMD x86-64 and x86.
+   Copyright (C) 2004, 2005, 2006, 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.
+   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->regs.cfa_how = CFA_REG_OFFSET;
+  /* Register 7 is rsp  */
+  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)&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->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)&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  */