2009-07-20 Shujing Zhao <pearly.zhao@oracle.com>

[pf3gnuchains/gcc-fork.git] / gcc / unwind-dw2.c

diff --git a/gcc/unwind-dw2.c b/gcc/unwind-dw2.c
index dd3dd54..68a1a28 100644 (file)
--- a/gcc/unwind-dw2.c
+++ b/gcc/unwind-dw2.c
@@ -1473,18 +1473,31 @@ uw_init_context_1 (struct _Unwind_Context *context,
   context->ra = __builtin_extract_return_addr (outer_ra);
 }
 
+static void _Unwind_DebugHook (void *, void *) __attribute__ ((__noinline__));
+
+/* This function is called during unwinding.  It is intended as a hook
+   for a debugger to intercept exceptions.  CFA is the CFA of the
+   target frame.  HANDLER is the PC to which control will be
+   transferred.  */
+static void
+_Unwind_DebugHook (void *cfa __attribute__ ((__unused__)),
+                  void *handler __attribute__ ((__unused__)))
+{
+  asm ("");
+}
 
 /* Install TARGET into CURRENT so that we can return to it.  This is a
    macro because __builtin_eh_return must be invoked in the context of
    our caller.  */
 
-#define uw_install_context(CURRENT, TARGET)                             \
-  do                                                                    \
-    {                                                                   \
-      long offset = uw_install_context_1 ((CURRENT), (TARGET));                 \
-      void *handler = __builtin_frob_return_addr ((TARGET)->ra);        \
-      __builtin_eh_return (offset, handler);                            \
-    }                                                                   \
+#define uw_install_context(CURRENT, TARGET)                            \
+  do                                                                   \
+    {                                                                  \
+      long offset = uw_install_context_1 ((CURRENT), (TARGET));                \
+      void *handler = __builtin_frob_return_addr ((TARGET)->ra);       \
+      _Unwind_DebugHook ((TARGET)->cfa, handler);                      \
+      __builtin_eh_return (offset, handler);                           \
+    }                                                                  \
   while (0)
 
 static long