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Deja Vu: when preparing the initial trap frame for a new forked lwp, 

explicitly clear condition code. Otherwise we might catch a signal
(handlers are inherited from the parent) before we ever return to
userland. The current trapframe is converted into a ucontext and after
the signal handler returns, the lwp stays in userland and directly
uses the ucontext to return to the fork call.
Fixes PR 41302.
This commit is contained in:
martin 2009-05-21 13:24:38 +00:00
parent 8051e74774
commit b808c7c6b8
1 changed files with 8 additions and 3 deletions
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11
sys/arch/sparc64/sparc64/vm_machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: vm_machdep.c,v 1.87 2009/03/16 23:11:15 dsl Exp $ */
/* $NetBSD: vm_machdep.c,v 1.88 2009/05/21 13:24:38 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 1.87 2009/03/16 23:11:15 dsl Exp $");
__KERNEL_RCSID(0, "$NetBSD: vm_machdep.c,v 1.88 2009/05/21 13:24:38 martin Exp $");
#include "opt_multiprocessor.h"
@ -261,9 +261,14 @@ cpu_lwp_fork(register struct lwp *l1, register struct lwp *l2, void *stack, size
if (stack != NULL)
tf2->tf_out[6] = (uint64_t)(u_long)stack + stacksize;
/* Set return values in child mode */
/*
* Set return values in child mode and clear condition code,
* in case we end up running a signal handler before returning
* to userland.
*/
tf2->tf_out[0] = 0;
tf2->tf_out[1] = 1;
tf2->tf_tstate &= ~TSTATE_CCR;
/* Construct kernel frame to return to in cpu_switch() */
rp = (struct rwindow *)((u_long)npcb + TOPFRAMEOFF);