* spu-tdep.c (spu_frame_unwind_cache): Do not attempt to unwind

SP or return address if we failed to find a valid frame.

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2008-09-03  Ulrich Weigand  <uweigand@de.ibm.com>
+
+	* spu-tdep.c (spu_frame_unwind_cache): Do not attempt to unwind
+	SP or return address if we failed to find a valid frame.
+
 2008-09-03  Aleksandar Ristovski  <aristovski@qnx.com>
 
 	* breakpoint.c (breakpoint_init_inferior): Mark as not inserted only

gdb/spu-tdep.c

@@ -910,6 +910,10 @@ spu_frame_unwind_cache (struct frame_info *this_frame,
 	}
     }
 
+  /* If we didn't find a frame, we cannot determine SP / return address.  */
+  if (info->frame_base == 0)
+    return info;
+
   /* The previous SP is equal to the CFA.  */
   trad_frame_set_value (info->saved_regs, SPU_SP_REGNUM, info->frame_base);