diff -urpN gdb-6.7-orig/gdb/regcache.c gdb-6.7/gdb/regcache.c
--- gdb-6.7-orig/gdb/regcache.c	2008-03-03 19:30:54.000000000 +0100
+++ gdb-6.7/gdb/regcache.c	2008-03-03 20:30:10.000000000 +0100
@@ -172,11 +172,18 @@ register_size (struct gdbarch *gdbarch, 
 {
   struct regcache_descr *descr = regcache_descr (gdbarch);
   int size;
-  gdb_assert (regnum >= 0
-	      && regnum < (gdbarch_num_regs (gdbarch)
-			   + gdbarch_num_pseudo_regs (gdbarch)));
-  size = descr->sizeof_register[regnum];
-  return size;
+
+ 
+  if (regnum >= 0 
+      && regnum < (gdbarch_num_regs (gdbarch)
+	 + gdbarch_num_pseudo_regs (gdbarch)))
+    {
+      size = descr->sizeof_register[regnum];
+      return size;
+    }
+
+  internal_error (__FILE__, __LINE__, _("invalid register %d"), regnum);
+  return 0;
 }
 
 /* The register cache for storing raw register values.  */