126 lines
4.2 KiB
C
126 lines
4.2 KiB
C
/* $NetBSD: compat_13_machdep.c,v 1.3 1998/09/13 01:42:45 thorpej Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1996, 1997, 1998 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Charles M. Hannum.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/signalvar.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/map.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/user.h>
|
|
#include <sys/mount.h>
|
|
#include <sys/syscallargs.h>
|
|
|
|
#ifdef VM86
|
|
#include <machine/vm86.h>
|
|
#endif
|
|
|
|
int
|
|
compat_13_sys_sigreturn(p, v, retval)
|
|
struct proc *p;
|
|
void *v;
|
|
register_t *retval;
|
|
{
|
|
struct compat_13_sys_sigreturn_args /* {
|
|
syscallarg(struct sigcontext13 *) sigcntxp;
|
|
} */ *uap = v;
|
|
struct sigcontext13 *scp, context;
|
|
struct trapframe *tf;
|
|
sigset_t mask;
|
|
|
|
/*
|
|
* The trampoline code hands us the context.
|
|
* It is unsafe to keep track of it ourselves, in the event that a
|
|
* program jumps out of a signal handler.
|
|
*/
|
|
scp = SCARG(uap, sigcntxp);
|
|
if (copyin((caddr_t)scp, &context, sizeof(*scp)) != 0)
|
|
return (EFAULT);
|
|
|
|
/* Restore register context. */
|
|
tf = p->p_md.md_regs;
|
|
#ifdef VM86
|
|
if (context.sc_eflags & PSL_VM) {
|
|
tf->tf_vm86_gs = context.sc_gs;
|
|
tf->tf_vm86_fs = context.sc_fs;
|
|
tf->tf_vm86_es = context.sc_es;
|
|
tf->tf_vm86_ds = context.sc_ds;
|
|
set_vflags(p, context.sc_eflags);
|
|
} else
|
|
#endif
|
|
{
|
|
/*
|
|
* Check for security violations. If we're returning to
|
|
* protected mode, the CPU will validate the segment registers
|
|
* automatically and generate a trap on violations. We handle
|
|
* the trap, rather than doing all of the checking here.
|
|
*/
|
|
if (((context.sc_eflags ^ tf->tf_eflags) & PSL_USERSTATIC) != 0 ||
|
|
!USERMODE(context.sc_cs, context.sc_eflags))
|
|
return (EINVAL);
|
|
|
|
/* %fs and %gs were restored by the trampoline. */
|
|
tf->tf_es = context.sc_es;
|
|
tf->tf_ds = context.sc_ds;
|
|
tf->tf_eflags = context.sc_eflags;
|
|
}
|
|
tf->tf_edi = context.sc_edi;
|
|
tf->tf_esi = context.sc_esi;
|
|
tf->tf_ebp = context.sc_ebp;
|
|
tf->tf_ebx = context.sc_ebx;
|
|
tf->tf_edx = context.sc_edx;
|
|
tf->tf_ecx = context.sc_ecx;
|
|
tf->tf_eax = context.sc_eax;
|
|
tf->tf_eip = context.sc_eip;
|
|
tf->tf_cs = context.sc_cs;
|
|
tf->tf_esp = context.sc_esp;
|
|
tf->tf_ss = context.sc_ss;
|
|
|
|
/* Restore signal stack. */
|
|
if (context.sc_onstack & SS_ONSTACK)
|
|
p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
|
|
else
|
|
p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK;
|
|
|
|
/* Restore signal mask. */
|
|
native_sigset13_to_sigset(&context.sc_mask, &mask);
|
|
(void) sigprocmask1(p, SIG_SETMASK, &mask, 0);
|
|
|
|
return (EJUSTRETURN);
|
|
}
|