ada:

	PR target/50678
	* init.c (Darwin/__gnat_error_handler): Apply a work-around to the
	bug [filed as radar #10302855], which is inconsistent unwind data
	for sigtramp.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@180613 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index bacb371..11d0209 100644 (file)
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,11 @@
+2011-10-28  Iain Sandoe  <iains@gcc.gnu.org>
+           Eric Botcazou  <ebotcazou@adacore.com>
+
+       PR target/50678
+       * init.c (Darwin/__gnat_error_handler): Apply a work-around to the
+       bug [filed as radar #10302855], which is inconsistent unwind data
+       for sigtramp.
+
 2011-10-28  Eric Botcazou  <ebotcazou@adacore.com>
 
        PR ada/50842

diff --git a/gcc/ada/init.c b/gcc/ada/init.c
index 9ac475d..8d2f4e1 100644 (file)
--- a/gcc/ada/init.c
+++ b/gcc/ada/init.c
@@ -2287,6 +2287,16 @@ __gnat_error_handler (int sig, siginfo_t *si, void *ucontext ATTRIBUTE_UNUSED)
 {
   struct Exception_Data *exception;
   const char *msg;
+#if defined (__x86_64__)
+  /* Work around radar #10302855/pr50678, where the unwinders (libunwind or
+     libgcc_s depending on the system revision) and the DWARF unwind data for
+     the sigtramp have different ideas about register numbering (causing rbx
+     and rdx to be transposed)..  */
+  ucontext_t *uc = (ucontext_t *)ucontext ;
+  unsigned long t = uc->uc_mcontext->__ss.__rbx;
+  uc->uc_mcontext->__ss.__rbx = uc->uc_mcontext->__ss.__rdx;
+  uc->uc_mcontext->__ss.__rdx = t;
+#endif
 
   switch (sig)
     {