Index: alpha-tdep.c
===================================================================
--- alpha-tdep.c	(revision 131678)
+++ alpha-tdep.c	(working copy)
@@ -1175,6 +1175,10 @@ alpha_heuristic_frame_prev_register (str
   struct alpha_heuristic_unwind_cache *info
     = alpha_heuristic_frame_unwind_cache (this_frame, this_prologue_cache, 0);
 
+  /* The stack pointer of the previous frame is this frame's vfp.  */
+  if (regnum == ALPHA_SP_REGNUM)
+    return frame_unwind_got_constant (this_frame, regnum, info->vfp);
+
   /* The PC of the previous frame is stored in the link register of
      the current frame.  Frob regnum so that we pull the value from
      the correct place.  */