/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */
#include <sys/asm_linkage.h>

        .file   "mach-crt1.S"
        .ident  ""

/* global entities defined elsewhere but used here */
        .globl  _start_crt

/*
 * C language startup routine.
 * Assume that exec code has cleared the direction flag in the TSS.
 * Assume that %esp is set to the addr after the last word pushed.
 * The stack contains (in order): argc, argv[],envp[],...
 * Assume that all of the segment registers are initialized.
 *
 * Allocate a NULL return address and a NULL previous %ebp as if
 * there was a genuine call to _start.
 * debugger stack trace shows _start(argc,argv[0],argv[1],...,envp[0],...)
 */
ENTRY_NP(_start)
        pushl   $0
        pushl   $0
        movl    %esp,%ebp               /* The first stack frame */

        /*
         * The stack needs to be 16-byte aligned with a 4-byte bias.  See
         * comment in lib/libc/i386/gen/makectxt.c.
         *
         * Note: If you change it, you need to change it in the following
         * files as well:
         *
         *  - lib/libc/i386/threads/machdep.c
         *  - lib/libc/i386/gen/makectxt.c
         *  - lib/crt/i386/crti.s
         */
        andl    $-16,%esp       /* make main() and exit() be called with */
        subl    $4,%esp         /* a properly aligned stack pointer */
        pushl   %edx            /* possible atexit handler */
        leal    12(%ebp),%edx   /* argv */
        movl    8(%ebp),%eax    /* argc */
        pushl   %edx
        pushl   %eax
        call    _start_crt
        hlt
SET_SIZE(_start)

#include "fsr.S"

/*
 * The following is here in case any object module compiled with cc -p
 * was linked into this module.
 */
ENTRY_NP(_mcount)
        .weak   _mcount
        ret
SET_SIZE(_mcount)