/*      $NetBSD: compat_13_machdep.c,v 1.12 2009/11/21 04:16:51 rmind 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 Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * 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.
 *
 * 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.12 2009/11/21 04:16:51 rmind Exp $");

#ifdef _KERNEL_OPT
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/mount.h>
#include <sys/signal.h>
#include <sys/signalvar.h>

#include <compat/sys/signal.h>
#include <compat/sys/signalvar.h>

#include <sys/syscallargs.h>

/*
 * System call to cleanup state after a signal
 * has been taken.  Reset signal mask and
 * stack state from context left by sendsig (above),
 * and return to the given trap frame (if there is one).
 * Check carefully to make sure that the user has not
 * modified the state to gain improper privileges or to cause
 * a machine fault.
 */
/* ARGSUSED */
int
compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
{
        /* {
                syscallarg(struct sigcontext13 *) sigcntxp;
        } */
        struct proc *p = l->l_proc;
        struct sigcontext13 sc, *scp;
        sigset_t mask;
        struct trapframe *tf;
        int error;

        /* First ensure consistent stack state (see sendsig). */
        write_user_windows();
        if (rwindow_save(l)) {
                mutex_enter(p->p_lock);
                sigexit(l, SIGILL);
        }

        if ((error = copyin(SCARG(uap, sigcntxp), &sc, sizeof sc)) != 0)
                return (error);
        scp = &sc;

        tf = l->l_md.md_tf;
        /*
         * Only the icc bits in the psr are used, so it need not be
         * verified.  pc and npc must be multiples of 4.  This is all
         * that is required; if it holds, just do it.
         */
        if (((scp->sc_pc | scp->sc_npc) & 3) != 0)
                return (EINVAL);
        /* take only psr ICC field */
        tf->tf_psr = (tf->tf_psr & ~PSR_ICC) | (scp->sc_psr & PSR_ICC);
        tf->tf_pc = scp->sc_pc;
        tf->tf_npc = scp->sc_npc;
        tf->tf_global[1] = scp->sc_g1;
        tf->tf_out[0] = scp->sc_o0;
        tf->tf_out[6] = scp->sc_sp;

        mutex_enter(p->p_lock);
        if (scp->sc_onstack & SS_ONSTACK)
                l->l_sigstk.ss_flags |= SS_ONSTACK;
        else
                l->l_sigstk.ss_flags &= ~SS_ONSTACK;
        /* Restore signal mask */
        native_sigset13_to_sigset(&scp->sc_mask, &mask);
        (void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
        mutex_exit(p->p_lock);

        return (EJUSTRETURN);
}