crt1.c revision 135679 
1/* LINTLIBRARY */
2/*-
3 * Copyright 2001 David E. O'Brien.
4 * All rights reserved.
5 * Copyright 1996-1998 John D. Polstra.
6 * All rights reserved.
7 * Copyright (c) 1997 Jason R. Thorpe.
8 * Copyright (c) 1995 Christopher G. Demetriou
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *          This product includes software developed for the
22 *          FreeBSD Project.  See http://www.freebsd.org/ for
23 *          information about FreeBSD.
24 *          This product includes software developed for the
25 *          NetBSD Project.  See http://www.netbsd.org/ for
26 *          information about NetBSD.
27 * 4. The name of the author may not be used to endorse or promote products
28 *    derived from this software without specific prior written permission
29 *
30 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
32 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
33 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
34 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
35 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
39 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40 */
41
42#ifndef lint
43#ifndef __GNUC__
44#error "GCC is needed to compile this file"
45#endif
46#endif /* lint */
47
48#include <stdlib.h>
49
50#include "libc_private.h"
51#include "crtbrand.c"
52#include <machine/asm.h>
53
54struct Struct_Obj_Entry;
55struct ps_strings;
56
57extern int _DYNAMIC;
58#pragma weak _DYNAMIC
59
60extern void _fini(void);
61extern void _init(void);
62extern int main(int, char **, char **);
63extern void _start(int, char **, char **, const struct Struct_Obj_Entry *,
64    void (*)(void), struct ps_strings *);
65
66#ifdef GCRT
67extern void _mcleanup(void);
68extern void monstartup(void *, void *);
69extern int eprol;
70extern int etext;
71#endif
72
73char **environ;
74const char *__progname = "";
75struct ps_strings *__ps_strings;
76
77/* The entry function. */
78__asm("	.text			\n"
79"	.align	0		\n"
80"	.globl	_start		\n"
81"	_start:			\n"
82"	mov	r5, r2		/* cleanup */		\n"
83"	mov	r4, r1		/* obj_main */		\n"
84"	mov	r3, r0		/* ps_strings */	\n"
85"	/* Get argc, argv, and envp from stack */	\n"
86"	ldr	r0, [sp, #0x0000]	\n"
87"	add	r1, sp, #0x0004		\n"
88"	add	r2, r1, r0, lsl #2	\n"
89"	add	r2, r2, #0x0004		\n"
90"	/* Ensure the stack is properly aligned before calling C code. */\n"
91"	bic	sp, sp, #7	\n"
92"	sub	sp, sp, #8	\n"
93"	str	r5, [sp, #4]	\n"
94"	str	r4, [sp, #0]	\n"
95"\n"
96"	b	 __start  ");
97/* ARGSUSED */
98void
99__start(int argc, char **argv, char **env, struct ps_strings *ps_strings,
100    const struct Struct_Obj_Entry *obj __unused, void (*cleanup)(void))
101{
102	const char *s;
103
104	environ = env;
105
106	if (argc > 0 && argv[0] != NULL) {
107		__progname = argv[0];
108		for (s = __progname; *s != '\0'; s++)
109			if (*s == '/')
110				__progname = s + 1;
111	}
112
113	if (ps_strings != (struct ps_strings *)0)
114		__ps_strings = ps_strings;
115
116	if (&_DYNAMIC != NULL)
117		atexit(cleanup);
118	else
119		_init_tls();
120#ifdef GCRT
121	atexit(_mcleanup);
122#endif
123	atexit(_fini);
124#ifdef GCRT
125	monstartup(&eprol, &etext);
126#endif
127	_init();
128	exit( main(argc, argv, env) );
129}
130
131#ifdef GCRT
132__asm__(".text");
133__asm__("eprol:");
134__asm__(".previous");
135#endif
136
137__asm__(".ident\t\"$FreeBSD: head/lib/csu/arm/crt1.c 135679 2004-09-23 23:00:51Z cognet $\"");
138