* config/a29k/tm-a29k.h (FRAME_CHAIN): If rsize is zero, return zero.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index b0902ad..3dff28e 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,7 @@
+Thu Sep 16 20:37:06 1993  Jim Kingdon  (kingdon@cirdan.cygnus.com)
+
+       * config/a29k/tm-a29k.h (FRAME_CHAIN): If rsize is zero, return zero.
+
 Thu Sep 16 13:16:22 1993  Stu Grossman  (grossman at cygnus.com)
 
        * infrun.c (wait_for_inferior):  Allow user to single step within

diff --git a/gdb/config/a29k/tm-a29k.h b/gdb/config/a29k/tm-a29k.h
index 0b027be..ac102da 100644 (file)
--- a/gdb/config/a29k/tm-a29k.h
+++ b/gdb/config/a29k/tm-a29k.h
@@ -482,7 +482,12 @@ void init_frame_pc ();
 
 /* These are mostly dummies for the a29k because INIT_FRAME_PC
    sets prev->frame instead.  */
-#define FRAME_CHAIN(thisframe) ((thisframe)->frame + (thisframe)->rsize)
+/* If rsize is zero, we must be at end of stack (or otherwise hosed).
+   If we don't check rsize, we loop forever if we see rsize == 0.  */
+#define FRAME_CHAIN(thisframe) \
+  ((thisframe)->rsize == 0 \
+   ? 0 \
+   : (thisframe)->frame + (thisframe)->rsize)
 
 /* Determine if the frame has a 'previous' and back-traceable frame. */
 #define FRAME_IS_UNCHAINED(frame)      ((frame)->flags & TRANSPARENT)