------- Comment #5 from ebotcazou at gcc dot gnu dot org 2009-11-04 11:57
-------
> Running target unix//-m32
> FAIL: gnat.dg/null_pointer_deref1.adb execution test
>
> the 64bit variant passes.
>
> the log just states
>
> raised STORAGE_ERROR : stack overflow (or erroneous memory access)
OK, thanks for the clarification. Which kernel do you run? Does the following
patch help?
Index: config/i386/linux-unwind.h
===================================================================
--- config/i386/linux-unwind.h (revision 153778)
+++ config/i386/linux-unwind.h (working copy)
@@ -172,6 +172,25 @@ x86_fallback_frame_state (struct _Unwind
fs->signal_frame = 1;
return _URC_NO_REASON;
}
+
+#define MD_FROB_UPDATE_CONTEXT x86_frob_update_context
+
+/* Fix up for kernels that have vDSO, but don't have S flag in it. */
+
+static void
+x86_frob_update_context (struct _Unwind_Context *context,
+ _Unwind_FrameState *fs ATTRIBUTE_UNUSED)
+{
+ unsigned char *pc = context->ra;
+
+ /* movl $__NR_rt_sigreturn,%eax ; {int $0x80 | syscall} */
+ if (*(unsigned char *)(pc+0) == 0xb8
+ && *(unsigned int *)(pc+1) == 173
+ && (*(unsigned short *)(pc+5) == 0x80cd
+ || *(unsigned short *)(pc+5) == 0x050f))
+ _Unwind_SetSignalFrame (context, 1);
+}
+
#endif /* not glibc 2.0 */
#endif /* ifdef __x86_64__ */
#endif /* ifdef inhibit_libc */
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41929
