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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.
*/
#ifndef lint
#ifndef __GNUC__
#error "GCC is needed to compile this file"
#endif
#endif /* lint */
#include <stdlib.h>
#include "libc_private.h"
#include "crtbrand.c"
extern int _DYNAMIC;
#pragma weak _DYNAMIC
typedef void (*fptr)(void);
extern void _fini(void);
extern void _init(void);
extern int main(int, char **, char **);
extern void _start(char *, ...);
#ifdef GCRT
extern void _mcleanup(void);
extern void monstartup(void *, void *);
extern int eprol;
extern int etext;
#endif
char **environ;
const char *__progname = "";
static __inline fptr
get_rtld_cleanup(void)
{
fptr retval;
#ifdef __GNUC__
__asm__("movl %%edx,%0" : "=rm"(retval));
#else
retval = (fptr)0; /* XXXX Fix this for other compilers */
#endif
return(retval);
}
/* The entry function. */
void
_start(char *ap, ...)
{
fptr cleanup;
int argc;
char **argv;
char **env;
const char *s;
cleanup = get_rtld_cleanup();
argv = ≈
argc = *(long *)(void *)(argv - 1);
env = argv + argc + 1;
environ = env;
if (argc > 0 && argv[0] != NULL) {
__progname = argv[0];
for (s = __progname; *s != '\0'; s++)
if (*s == '/')
__progname = s + 1;
}
if (&_DYNAMIC != NULL)
atexit(cleanup);
#ifdef GCRT
atexit(_mcleanup);
#endif
atexit(_fini);
#ifdef GCRT
monstartup(&eprol, &etext);
#endif
_init();
#ifndef __GNUC__
exit( main(argc, argv, env) );
#else
/*
* Some versions of gcc-2 expect the stack frame to be aligned as
* follows after it is set up in main():
*
* +--------------+ <--- aligned by PREFERRED_STACK_BOUNDARY
* +%ebp (if any) +
* +--------------+
* |return address|
* +--------------+
* | arguments |
* | : |
* | : |
* +--------------+
*
* We implement the above to fix just the usual case in FreeBSD-4.
* Alignment for main() is too compiler-dependent to handle correctly
* in all cases here (or in the kernel). E.g., a different alignment
* is required for at least gcc-2.95.4 even for the small variation
* of compiling main() with -fomit-frame-pointer.
*/
__asm__("
andl $~0xf, %%esp # align stack to 16-byte boundary
subl $12+12, %%esp # space for args and padding
movl %0, 0(%%esp)
movl %1, 4(%%esp)
movl %2, 8(%%esp)
call main
movl %%eax, 0(%%esp)
call exit
" : : "r" (argc), "r" (argv), "r" (env) : "ax", "cx", "dx", "memory");
#endif
}
#ifdef GCRT
__asm__(".text");
__asm__("eprol:");
__asm__(".previous");
#endif
__asm__(".ident\t\"$FreeBSD$\"");
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