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:
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