From 3b86738bf339a038f824d7b588ec228de0aa38bf Mon Sep 17 00:00:00 2001
From: martin <martin@NetBSD.org>
Date: Fri, 16 Jan 2004 12:42:41 +0000
Subject: [PATCH] Don't rely on proc_trampoline to clear condition codes for a
 new 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.

---
 sys/arch/sparc64/sparc64/vm_machdep.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/sys/arch/sparc64/sparc64/vm_machdep.c b/sys/arch/sparc64/sparc64/vm_machdep.c
index 21f5dbde9de3..b649898dfe2b 100644
--- a/sys/arch/sparc64/sparc64/vm_machdep.c
+++ b/sys/arch/sparc64/sparc64/vm_machdep.c
@@ -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