Basic VM and other minor improvements.

Not complete, probably not fully debugged or optimized.

lib/syslib/panic.c

@@ -19,9 +19,19 @@ int num;			/* number to go with format string */
  * value of a defined constant.
  */
   message m;
+  endpoint_t me = NONE;
+  char name[20];
   void (*suicide)(void);
-
+  if(panicing) return;
   panicing= 1;
+
+  if(sys_whoami(&me, name, sizeof(name)) == OK && me != NONE)
+	printf("%s(%d): ", name, me);
+  else
+	printf("(sys_whoami failed): ");
+  printf("syslib:panic.c: stacktrace: ");
+  util_stacktrace();
+
   if (NULL != who && NULL != mess) {
       if (num != NO_NUM) {
           printf("Panic in %s: %s: %d\n", who, mess, num); 
@@ -39,12 +49,10 @@ int num;			/* number to go with format string */
   /* If exiting nicely through PM fails for some reason, try to
    * commit suicide. E.g., message to PM might fail due to deadlock.
    */
-  printf("panic: trying exception\n");
   suicide = (void (*)(void)) -1;
   suicide();
 
   /* If committing suicide fails for some reason, hang. */
-  printf("panic: for ever and ever\n");
   for(;;) { }
 }