--- gdb/frame.c	11 Jan 2007 17:40:17 +0100	1.218
+++ gdb/frame.c	11 Jan 2007 17:43:00 +0100	
@@ -1223,8 +1223,11 @@ get_prev_frame_1 (struct frame_info *thi
      happen when the prologue analyzer finds a stack adjustment, but
      no PC save.  This check does assume that the "PC register" is
      roughly a traditional PC, even if the gdbarch_unwind_pc method
-     frobs it.  */
-  if (this_frame->level > 0
+     frobs it.
+
+     Skip this check when there is no "PC register".  */
+  if (PC_REGNUM >= 0
+      && this_frame->level > 0
       && get_frame_type (this_frame) == NORMAL_FRAME
       && get_frame_type (this_frame->next) == NORMAL_FRAME)
     {