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In cpu_switch(), load value *after* checking that the base register 

is not NULL.
This commit is contained in:
nathanw 2000-07-19 14:00:24 +00:00
parent 554019cd4b
commit e72ba11928
1 changed files with 3 additions and 3 deletions
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6
sys/arch/alpha/alpha/locore.s
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@ -1,4 +1,4 @@
/* $NetBSD: locore.s,v 1.77 2000/06/05 21:47:13 thorpej Exp $ */
/* $NetBSD: locore.s,v 1.78 2000/07/19 14:00:24 nathanw Exp $ */
/*-
* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
@ -76,7 +76,7 @@
#include <machine/asm.h>
__KERNEL_RCSID(0, "$NetBSD: locore.s,v 1.77 2000/06/05 21:47:13 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: locore.s,v 1.78 2000/07/19 14:00:24 nathanw Exp $");
#include "assym.h"
@ -844,11 +844,11 @@ cpu_switch_queuescan:
addq t1, t0, t0 /* t0 = qp = &qs[firstbit] */
ldq t4, PH_LINK(t0) /* t4 = p = highest pri proc */
ldq t5, P_FORW(t4) /* t5 = p->p_forw */
bne t4, 4f /* make sure p != NULL */
PANIC("cpu_switch",Lcpu_switch_pmsg) /* nothing in queue! */
4:
ldq t5, P_FORW(t4) /* t5 = p->p_forw */
stq t5, PH_LINK(t0) /* qp->ph_link = p->p_forw */
stq t0, P_BACK(t5) /* p->p_forw->p_back = qp */
stq zero, P_BACK(t4) /* firewall: p->p_back = NULL */