--- src/sys/i386/i386/Attic/pmap.c	2004/06/02 07:34:29	1.43
+++ src/sys/i386/i386/Attic/pmap.c	2004/07/29 08:54:58	1.44
@@ -898,7 +898,9 @@ retry:
 void
 pmap_init_thread(thread_t td)
 {
-	td->td_pcb = (struct pcb *)(td->td_kstack + UPAGES * PAGE_SIZE) - 1;
+	/* enforce pcb placement */
+	KKASSERT(td->td_kstack_size == UPAGES * PAGE_SIZE);
+	td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_size) - 1;
 	td->td_savefpu = &td->td_pcb->pcb_save;
 	td->td_sp = (char *)td->td_pcb - 16;
 }