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Fix stack location for VM86 processes in the !sigaltstack case.

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I doubt it makes much sense to use the VM's stack for this, but the
old code was doubtless wrong because it potentially overwrote random
user memory.
(It might be a good idea to use the process' pre-vm86()-call stack,
but atm the infrastructure for this is missing.)
This commit is contained in:
drochner 2003-08-11 14:09:18 +00:00
parent 4257f06ff2
commit e8d0979bed
1 changed files with 10 additions and 4 deletions
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14
sys/arch/i386/i386/machdep.c
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@ -1,4 +1,4 @@
/* $NetBSD: machdep.c,v 1.528 2003/08/07 16:27:54 agc Exp $ */
/* $NetBSD: machdep.c,v 1.529 2003/08/11 14:09:18 drochner Exp $ */
/*-
* Copyright (c) 1996, 1997, 1998, 2000 The NetBSD Foundation, Inc.
@ -72,7 +72,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.528 2003/08/07 16:27:54 agc Exp $");
__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.529 2003/08/11 14:09:18 drochner Exp $");
#include "opt_cputype.h"
#include "opt_ddb.h"
@ -617,8 +617,14 @@ sendsig(sig, mask, code)
if (onstack)
fp = (struct sigframe *)((caddr_t)p->p_sigctx.ps_sigstk.ss_sp +
p->p_sigctx.ps_sigstk.ss_size);
else
fp = (struct sigframe *)tf->tf_esp;
else {
#ifdef VM86
if (tf->tf_eflags & PSL_VM)
fp = (struct sigframe *)(tf->tf_esp + (tf->tf_ss << 4));
else
#endif
fp = (struct sigframe *)tf->tf_esp;
}
fp--;
/* Build stack frame for signal trampoline. */