crt1_c.c revision 67811 
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 * $FreeBSD: head/lib/csu/i386-elf/crt1.c 67811 2000-10-28 21:26:48Z obrien $
26 */
27
28#ifndef __GNUC__
29#error "GCC is needed to compile this file"
30#endif
31
32#include <stddef.h>
33#include <stdlib.h>
34#include "crtbrand.c"
35
36typedef void (*fptr)(void);
37
38extern void _fini(void);
39extern void _init(void);
40extern int main(int, char **, char **);
41
42#ifdef GCRT
43extern void _mcleanup(void);
44extern void monstartup(void *, void *);
45extern int eprol;
46extern int etext;
47#endif
48
49extern int _DYNAMIC;
50#pragma weak _DYNAMIC
51
52#ifdef __i386__
53#define get_rtld_cleanup()				\
54    ({ fptr __value;					\
55       __asm__("movl %%edx,%0" : "=rm"(__value));	\
56       __value; })
57#else
58#error "This file only supports the i386 architecture"
59#endif
60
61char **environ;
62char *__progname = "";
63
64void
65_start(char *arguments, ...)
66{
67    fptr rtld_cleanup;
68    int argc;
69    char **argv;
70    char **env;
71
72    rtld_cleanup = get_rtld_cleanup();
73    argv = &arguments;
74    argc = * (int *) (argv - 1);
75    env = argv + argc + 1;
76    environ = env;
77    if(argc > 0 && argv[0] != NULL) {
78	char *s;
79	__progname = argv[0];
80	for (s = __progname; *s != '\0'; s++)
81	    if (*s == '/')
82		__progname = s + 1;
83    }
84
85    if(&_DYNAMIC != NULL)
86	atexit(rtld_cleanup);
87
88#ifdef GCRT
89    atexit(_mcleanup);
90#endif
91    atexit(_fini);
92#ifdef GCRT
93    monstartup(&eprol, &etext);
94#endif
95    _init();
96    exit( main(argc, argv, env) );
97}
98
99#ifdef GCRT
100__asm__(".text");
101__asm__("eprol:");
102__asm__(".previous");
103#endif
104