crt1.c revision 163118 
1/* LINTLIBRARY */
2/*-
3 * Copyright 2001 David E. O'Brien.
4 * All rights reserved.
5 * Copyright (c) 1995, 1998 Berkeley Software Design, Inc.
6 * All rights reserved.
7 * Copyright 1996-1998 John D. Polstra.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the authors may not be used to endorse or promote products
19 *    derived from this software without specific prior written permission
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#ifndef lint
34#ifndef __GNUC__
35#error "GCC is needed to compile this file"
36#endif
37#endif /* lint */
38
39#include <stdlib.h>
40
41#include "libc_private.h"
42#include "crtbrand.c"
43
44struct Struct_Obj_Entry;
45struct ps_strings;
46
47extern int _DYNAMIC;
48#pragma weak _DYNAMIC
49
50extern void _fini(void);
51extern void _init(void);
52extern int main(int, char **, char **);
53extern void _start(char **, void (*)(void), struct Struct_Obj_Entry *,
54    struct ps_strings *);
55extern void __sparc_utrap_setup(void);
56
57#ifdef GCRT
58extern void _mcleanup(void);
59extern void monstartup(void *, void *);
60extern int eprol;
61extern int etext;
62#endif
63
64char **environ;
65const char *__progname = "";
66
67/* The entry function. */
68/*
69 * %o0 holds ps_strings pointer.
70 *
71 * Note: kernel may (is not set in stone yet) pass ELF aux vector in %o1,
72 * but for now we do not use it here.
73 *
74 * The SPARC compliance definitions specifies that the kernel pass the
75 * address of a function to be executed on exit in %g1. We do not make
76 * use of it as it is quite broken, because gcc can use this register
77 * as a temporary, so it is not safe from C code. Its even more broken
78 * for dynamic executables since rtld runs first.
79 */
80/* ARGSUSED */
81void
82_start(char **ap, void (*cleanup)(void), struct Struct_Obj_Entry *obj __unused,
83    struct ps_strings *ps_strings __unused)
84{
85	int argc;
86	char **argv;
87	char **env;
88	const char *s;
89
90	argc = *(long *)(void *)ap;
91	argv = ap + 1;
92	env  = ap + 2 + argc;
93	environ = env;
94	if (argc > 0 && argv[0] != NULL) {
95		__progname = argv[0];
96		for (s = __progname; *s != '\0'; s++)
97			if (*s == '/')
98				__progname = s + 1;
99	}
100
101	if (&_DYNAMIC != NULL)
102		atexit(cleanup);
103	else {
104		__sparc_utrap_setup();
105		_init_tls();
106	}
107#ifdef GCRT
108	atexit(_mcleanup);
109#endif
110	atexit(_fini);
111#ifdef GCRT
112	monstartup(&eprol, &etext);
113#endif
114	_init();
115	exit( main(argc, argv, env) );
116}
117
118#ifdef GCRT
119__asm__(".text");
120__asm__("eprol:");
121__asm__(".previous");
122#endif
123
124__asm__(".ident\t\"$FreeBSD: head/lib/csu/sparc64/crt1.c 163118 2006-10-08 02:50:34Z kmacy $\"");
125