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* copied from BSD

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marco 2000-02-04 16:51:02 +00:00
parent 16e46c496c
commit e59b21aff1
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rtl/bsd/i386/crt1.c Normal file
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/*-
* Copyright 1996-1998 John D. Polstra.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD: src/lib/csu/i386-elf/crt1.c,v 1.3.2.1 1999/08/29 14:55:14 peter Exp $
*/
#ifndef __GNUC__
#error "GCC is needed to compile this file"
#endif
#include <stddef.h>
#include <stdlib.h>
typedef void (*fptr)(void);
extern void _fini(void);
extern void _init(void);
extern int main(int, char **, char **);
#ifdef GCRT
extern void _mcleanup(void);
extern void monstartup(void *, void *);
extern int eprol;
extern int etext;
#endif
extern int _DYNAMIC;
#pragma weak _DYNAMIC
#ifdef __i386__
#define get_rtld_cleanup() \
({ fptr __value; \
__asm__("movl %%edx,%0" : "=rm"(__value)); \
__value; })
#else
#error "This file only supports the i386 architecture"
#endif
char **environ;
char *__progname = "";
void
_start(char *arguments, ...)
{
fptr rtld_cleanup;
int argc;
char **argv;
char **env;
rtld_cleanup = get_rtld_cleanup();
argv = &arguments;
argc = * (int *) (argv - 1);
env = argv + argc + 1;
environ = env;
if(argc > 0 && argv[0] != NULL) {
char *s;
__progname = argv[0];
for (s = __progname; *s != '\0'; s++)
if (*s == '/')
__progname = s + 1;
}
if(&_DYNAMIC != NULL)
atexit(rtld_cleanup);
#ifdef GCRT
atexit(_mcleanup);
#endif
atexit(_fini);
#ifdef GCRT
monstartup(&eprol, &etext);
#endif
_init();
exit( main(argc, argv, env) );
}
#ifdef GCRT
__asm__(".text");
__asm__("eprol:");
__asm__(".previous");
#endif