crt1.c revision 34198 
1/*-
2 * Copyright 1996-1998 John D. Polstra.
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 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 *      $Id: crt1.c,v 1.4 1996/04/12 02:24:35 jdp Exp $
26 */
27
28#ifndef __GNUC__
29#error "GCC is needed to compile this file"
30#endif
31
32#include <stdlib.h>
33
34typedef void (*fptr)(void);
35
36extern void _fini(void);
37extern void _init(void);
38extern int main(int, char **, char **);
39
40extern int _DYNAMIC;
41#pragma weak _DYNAMIC
42
43#ifdef __i386__
44#define get_rtld_cleanup()				\
45    ({ fptr __value;					\
46       __asm__("movl %%edx,%0" : "=rm"(__value));	\
47       __value; })
48#else
49#error "This file only supports the i386 architecture"
50#endif
51
52char **environ;
53char *__progname = "";
54
55void
56_start(char *arguments, ...)
57{
58    fptr rtld_cleanup;
59    int argc;
60    char **argv;
61    char **env;
62
63    rtld_cleanup = get_rtld_cleanup();
64    argv = &arguments;
65    argc = * (int *) (argv - 1);
66    env = argv + argc + 1;
67    environ = env;
68    if(argc > 0)
69	__progname = argv[0];
70
71    if(&_DYNAMIC != 0)
72	atexit(rtld_cleanup);
73
74    atexit(_fini);
75    _init();
76    exit( main(argc, argv, env) );
77}
78