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:
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