/*      $NetBSD: aout_machdep.c,v 1.1 2008/11/20 10:53:09 ad Exp $      */

/*-
 * Copyright (c) 1996, 1997, 1998, 2000, 2004, 2006, 2008 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Charles M. Hannum, by Jason R. Thorpe of the Numerical Aerospace
 * Simulation Facility, NASA Ames Research Center and by Julio M. Merino Vidal.
 *
 * 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.
 */

/*-
 * 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. 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/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: aout_machdep.c,v 1.1 2008/11/20 10:53:09 ad Exp $");

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

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/exec.h>
#include <sys/exec_aout.h>

#ifdef COMPAT_NOMID
static int
exec_nomid(struct lwp *l, struct exec_package *epp)
{
        int error;
        u_long midmag, magic;
        u_short mid;
        struct exec *execp = epp->ep_hdr;

        /* check on validity of epp->ep_hdr performed by exec_out_makecmds */

        midmag = ntohl(execp->a_midmag);
        mid = (midmag >> 16) & 0xffff;
        magic = midmag & 0xffff;

        if (magic == 0) {
                magic = (execp->a_midmag & 0xffff);
                mid = MID_ZERO;
        }

        midmag = mid << 16 | magic;

        switch (midmag) {
        case (MID_ZERO << 16) | ZMAGIC:
                /*
                 * 386BSD's ZMAGIC format:
                 */
                error = exec_aout_prep_oldzmagic(l, epp);
                break;

        case (MID_ZERO << 16) | QMAGIC:
                /*
                 * BSDI's QMAGIC format:
                 * same as new ZMAGIC format, but with different magic number
                 */
                error = exec_aout_prep_zmagic(l, epp);
                break;

        case (MID_ZERO << 16) | NMAGIC:
                /*
                 * BSDI's NMAGIC format:
                 * same as NMAGIC format, but with different magic number
                 * and with text starting at 0.
                 */
                error = exec_aout_prep_oldnmagic(l, epp);
                break;

        case (MID_ZERO << 16) | OMAGIC:
                /*
                 * BSDI's OMAGIC format:
                 * same as OMAGIC format, but with different magic number
                 * and with text starting at 0.
                 */
                error = exec_aout_prep_oldomagic(l, epp);
                break;

        default:
                error = ENOEXEC;
        }

        return error;
}
#endif

/*
 * cpu_exec_aout_makecmds():
 *      CPU-dependent a.out format hook for execve().
 *
 * Determine of the given exec package refers to something which we
 * understand and, if so, set up the vmcmds for it.
 *
 * On the i386, old (386bsd) ZMAGIC binaries and BSDI QMAGIC binaries
 * if COMPAT_NOMID is given as a kernel option.
 */
int
cpu_exec_aout_makecmds(struct lwp *l, struct exec_package *epp)
{
        int error = ENOEXEC;

#ifdef COMPAT_NOMID
        if ((error = exec_nomid(l, epp)) == 0)
                return error;
#else
        (void) l;
        (void) epp;
#endif /* ! COMPAT_NOMID */

        return error;
}