2 * Copyright 1996-1998 John D. Polstra.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
25 * $FreeBSD: src/lib/csu/i386-elf/crt1.c,v 1.4.2.2 2002/11/18 04:57:13 bde Exp $
26 * $DragonFly: src/lib/csu/i386/crt1.c,v 1.3 2005/05/11 19:46:51 dillon Exp $
30 #error "GCC is needed to compile this file"
33 #include <machine/tls.h>
38 typedef void (*fptr
)(void);
40 extern void _fini(void);
41 extern void _init(void);
42 extern int main(int, char **, char **);
45 extern void _mcleanup(void);
46 extern void monstartup(void *, void *);
55 #define get_rtld_cleanup() \
57 __asm__("movl %%edx,%0" : "=rm"(__value)); \
60 #error "This file only supports the i386 architecture"
64 char *__progname
= "";
67 _start(char *arguments
, ...)
74 rtld_cleanup
= get_rtld_cleanup();
76 argc
= * (int *) (argv
- 1);
77 env
= argv
+ argc
+ 1;
79 if(argc
> 0 && argv
[0] != NULL
) {
82 for (s
= __progname
; *s
!= '\0'; s
++)
88 * Setup the initial TLS space. The RTLD does not set up our TLS
89 * (it can't, it doesn't know how our errno is declared). It simply
90 * does all the groundwork required so that we can call
91 * _rtld_allocate_tls().
104 monstartup(&eprol
, &etext
);
108 exit( main(argc
, argv
, env
) );
111 * Some versions of gcc-2 expect the stack frame to be aligned as
112 * follows after it is set up in main():
114 * +--------------+ <--- aligned by PREFERRED_STACK_BOUNDARY
124 * We implement the above to fix just the usual case in FreeBSD-4.
125 * Alignment for main() is too compiler-dependent to handle correctly
126 * in all cases here (or in the kernel). E.g., a different alignment
127 * is required for at least gcc-2.95.4 even for the small variation
128 * of compiling main() with -fomit-frame-pointer.
131 "andl $~0xf, %%esp # align stack to 16-byte boundary\n"
132 "subl $12+12, %%esp # space for args and padding\n"
133 "movl %0, 0(%%esp)\n"
134 "movl %1, 4(%%esp)\n"
135 "movl %2, 8(%%esp)\n"
137 "movl %%eax, 0(%%esp)\n"
139 : : "r" (argc
), "r" (argv
), "r" (env
) : "ax", "cx", "dx", "memory");
146 __asm__(".previous");