crt1.c revision 109903 
1/*-
2 * Copyright 2001 David E. O'Brien.
3 * All rights reserved.
4 * Copyright (c) 1995, 1998 Berkeley Software Design, Inc.
5 * All rights reserved.
6 * Copyright 1996-1998 John D. Polstra.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 * 3. The name of the authors may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#ifndef lint
33#ifndef __GNUC__
34#error "GCC is needed to compile this file"
35#endif
36#endif /* lint */
37
38#include <stdlib.h>
39
40#include "libc_private.h"
41#include "crtbrand.c"
42
43struct Struct_Obj_Entry;
44struct ps_strings;
45
46extern int _DYNAMIC;
47#pragma weak _DYNAMIC
48
49typedef void (*fptr)(void);
50
51extern void _fini(void);
52extern void _init(void);
53extern int main(int, char **, char **);
54extern void _start(char **, void (*)(void), struct Struct_Obj_Entry *,
55    struct ps_strings *);
56extern void __sparc_utrap_setup(void);
57
58#ifdef GCRT
59extern void _mcleanup(void);
60extern void monstartup(void *, void *);
61extern int eprol;
62extern int etext;
63#endif
64
65char **environ;
66const char *__progname = "";
67
68/* The entry function. */
69/*
70 * %o0 holds ps_strings pointer.
71 *
72 * Note: kernel may (is not set in stone yet) pass ELF aux vector in %o1,
73 * but for now we do not use it here.
74 *
75 * The SPARC compliance definitions specifies that the kernel pass the
76 * address of a function to be executed on exit in %g1. We do not make
77 * use of it as it is quite broken, because gcc can use this register
78 * as a temporary, so it is not safe from C code. Its even more broken
79 * for dynamic executables since rtld runs first.
80 */
81/* ARGSUSED */
82void
83_start(char **ap, void (*cleanup)(void), struct Struct_Obj_Entry *obj __unused,
84    struct ps_strings *ps_strings __unused)
85{
86	int argc;
87	char **argv;
88	char **env;
89	const char *s;
90
91	argc = *(long *)(void *)ap;
92	argv = ap + 1;
93	env  = ap + 2 + argc;
94	environ = env;
95	if (argc > 0 && argv[0] != NULL) {
96		__progname = argv[0];
97		for (s = __progname; *s != '\0'; s++)
98			if (*s == '/')
99				__progname = s + 1;
100	}
101
102	__sparc_utrap_setup();
103
104	if (&_DYNAMIC != NULL)
105		atexit(cleanup);
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 109903 2003-01-26 23:01:36Z markm $\"");
125