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Don't rely on proc_trampoline to clear condition codes for a new

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child process on fork - it could be overtaken by a signal delivery
and then use the stale condition code in the trap frame.
Instead, set tf_tstate aproprietaly right from the start.
Fixes PR sparc64/20675.
Many thanks to Paul Kranenburg for hints on a similar problem he fixed
for the sparc port.
This commit is contained in:
martin 2004-01-16 12:42:41 +00:00
parent f8d2d740de
commit 3b86738bf3
1 changed files with 5 additions and 3 deletions
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8
sys/arch/sparc64/sparc64/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.53 2004/01/04 11:33:31 jdolecek Exp $ */
/* $NetBSD: vm_machdep.c,v 1.54 2004/01/16 12:42:41 martin Exp $ */
/*
* Copyright (c) 1996-2002 Eduardo Horvath. All rights reserved.
@ -50,7 +50,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.53 2004/01/04 11:33:31 jdolecek Exp $");
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.54 2004/01/16 12:42:41 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -296,7 +296,9 @@ cpu_lwp_fork(l1, l2, stack, stacksize, func, arg)
tf2->tf_tstate = (ASI_PRIMARY_NO_FAULT<<TSTATE_ASI_SHIFT) |
((PSTATE_USER)<<TSTATE_PSTATE_SHIFT);
else
tf2->tf_tstate &= ~(PSTATE_PEF<<TSTATE_PSTATE_SHIFT);
/* clear condition codes and disable FPU */
tf2->tf_tstate &=
~((PSTATE_PEF<<TSTATE_PSTATE_SHIFT)|TSTATE_CCR);
#ifdef NOTDEF_DEBUG