/*	$NetBSD: compat_13_machdep.c,v 1.1 1998/09/17 02:01:59 thorpej Exp $	*/

/*-
 * Copyright (c) 1996 Matthias Pfaller.
 * Copyright (c) 1993, 1994, 1995 Charles M. Hannum.  All rights reserved.
 * Copyright (c) 1993 Philip A. Nelson.
 * Copyright (c) 1992 Terrence R. Lambert.
 * Copyright (c) 1982, 1987, 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * William Jolitz.
 *
 * 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 University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *	@(#)machdep.c	7.4 (Berkeley) 6/3/91
 */

#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> 

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 reg *regs;
	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 the register context. */
	regs = p->p_md.md_regs;

	/*
	 * Check for security violations.
	 */
	if (((context.sc_ps ^ regs->r_psr) & PSL_USERSTATIC) != 0)
		return (EINVAL);

	regs->r_fp  = context.sc_fp;
	regs->r_sp  = context.sc_sp;
	regs->r_pc  = context.sc_pc;
	regs->r_psr = context.sc_ps;
	regs->r_sb  = context.sc_sb;
	regs->r_r7  = context.sc_reg[REG_R7];
	regs->r_r6  = context.sc_reg[REG_R6];
	regs->r_r5  = context.sc_reg[REG_R5];
	regs->r_r4  = context.sc_reg[REG_R4];
	regs->r_r3  = context.sc_reg[REG_R3];
	regs->r_r2  = context.sc_reg[REG_R2];
	regs->r_r1  = context.sc_reg[REG_R1];
	regs->r_r0  = context.sc_reg[REG_R0];

	/* 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);
}