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Annotation of prex-old/usr/arch/i386/crt0.S, Revision 1.1.1.1

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: