[PATCH 9/10] Divide by zero check

[William Hahne]

It is possible for BootX to purposefully divide by zero expecting 0 as the
result.

Index: kernel/forth.c
===================================================================
--- kernel/forth.c (revision 1041)
+++ kernel/forth.c (working copy)
@@ -1157,6 +1157,12 @@
 {
  const ucell b = POP();
  const ducell a = DPOP();
+
+ if (b == 0) { // can't divide by zero
+            PUSH(0);
+            DPUSH(0);
+            return;
+ }
 #ifdef NEED_FAKE_INT128_T
         if (a.hi != 0) {
             fprintf(stderr, "mudivmod called (0x%016llx %016llx /
0x%016llx)\n",