Update x32 __NR_rt_sigreturn system call number.

2011-08-02  H.J. Lu  <hongjiu.lu@intel.com>

	* config/i386/linux-unwind.h (RT_SIGRETURN_SYSCALL): New.
	(x86_64_fallback_frame_state): Use RT_SIGRETURN_SYSCALL and
	long long to check rt_sigreturn syscall.

From-SVN: r177229

libgcc/ChangeLog

+2011-08-02  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* config/i386/linux-unwind.h (RT_SIGRETURN_SYSCALL): New.
+	(x86_64_fallback_frame_state): Use RT_SIGRETURN_SYSCALL and
+	long long to check rt_sigreturn syscall.
+
 2011-08-02  Alan Modra  <amodra@gmail.com>
 
 	* config/rs6000/linux-unwind.h (frob_update_context <__powerpc64__>):

libgcc/config/i386/linux-unwind.h

@@ -44,9 +44,14 @@ x86_64_fallback_frame_state (struct _Unwind_Context *context,
   struct sigcontext *sc;
   long new_cfa;
 
-  /* movq __NR_rt_sigreturn, %rax ; syscall  */
+  /* movq $__NR_rt_sigreturn, %rax ; syscall.  */
+#ifdef __LP64__
+#define RT_SIGRETURN_SYSCALL	0x050f0000000fc0c7ULL
+#else
+#define RT_SIGRETURN_SYSCALL	0x050f40002006c0c7ULL
+#endif
   if (*(unsigned char *)(pc+0) == 0x48
-      && *(unsigned long *)(pc+1) == 0x050f0000000fc0c7)
+      && *(unsigned long long *)(pc+1) == RT_SIGRETURN_SYSCALL)
     {
       struct ucontext *uc_ = context->cfa;
       /* The void * cast is necessary to avoid an aliasing warning.