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Annotation of prex-old/usr/arch/i386/crt0.S, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 2005, Kohsuke Ohtani
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. Neither the name of the author nor the names of any co-contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: /*
        !            31:  * crt0.S - C startup routine
        !            32:  */
        !            33:
        !            34: /**
        !            35:  * Stack layout:
        !            36:  *      argc            argument counter (integer)
        !            37:  *      argv[0]         program name (pointer)
        !            38:  *      argv[1...N]     program args (pointers)
        !            39:  *      argv[argc-1]    end of args (integer)
        !            40:  *      NULL
        !            41:  *      env[0...N]      environment variables (pointers)
        !            42:  *      NULL
        !            43:  */
        !            44:
        !            45: /*
        !            46:  * Entry point called by kernel first
        !            47:  */
        !            48:        .text
        !            49:        .global _start
        !            50: _start:
        !            51:        popl    %ecx                    /* Get argc */
        !            52:        movl    %esp, %ebx              /* Get argv */
        !            53:        movl    %esp, %eax
        !            54:        movl    %ecx, %edx
        !            55:        leal    4(%eax,%edx,4), %eax    /* Get envp */
        !            56:
        !            57:        xorl    %ebp, %ebp              /* NULL */
        !            58:        pushl   %ebp                    /* Set return address */
        !            59:        pushl   %ebp
        !            60:
        !            61:        pushl   %eax                    /* Set envp */
        !            62:        pushl   %ebx                    /* Set argv */
        !            63:        pushl   %ecx                    /* Set argc */
        !            64:        call    __prex_main
        !            65: