unwind-ia64.c (uw_frame_state_for): Don't assume a leaf function without unwind info at RP 0.

	* config/ia64/unwind-ia64.c (uw_frame_state_for): Don't assume a
	leaf function without unwind info at RP 0.

From-SVN: r82906

gcc/ChangeLog

 2004-06-10  Jakub Jelinek  <jakub@redhat.com>
 
+	* config/ia64/unwind-ia64.c (uw_frame_state_for): Don't assume a
+	leaf function without unwind info at RP 0.
+
+2004-06-10  Jakub Jelinek  <jakub@redhat.com>
+
 	PR c++/14791
 	* tree.h (enum tree_index): Add TI_FILEPTR_TYPE.
 	(fileptr_type_node): Define.

gcc/config/ia64/unwind-ia64.c

@@ -1783,8 +1783,10 @@ uw_frame_state_for (struct _Unwind_Context *context, _Unwind_FrameState *fs)
 	 an unwind table entry.
 
 	 This can only happen in the frame after unwinding through a signal
-	 handler.  Avoid infinite looping by requiring that B0 != RP.  */
-      if (context->br_loc[0] && *context->br_loc[0] != context->rp)
+	 handler.  Avoid infinite looping by requiring that B0 != RP.
+	 RP == 0 terminates the chain.  */
+      if (context->br_loc[0] && *context->br_loc[0] != context->rp
+	  && context->rp != 0)
 	{
 	  fs->curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
 	  fs->curr.reg[UNW_REG_RP].when = -1;