crt1.c revision 204756 
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 __sparc_utrap_setup(void);
54
55#ifdef GCRT
56extern void _mcleanup(void);
57extern void monstartup(void *, void *);
58extern int eprol;
59extern int etext;
60#endif
61
62char **environ;
63const char *__progname = "";
64
65void _start(char **, void (*)(void), struct Struct_Obj_Entry *,
66    struct ps_strings *);
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	if (&_DYNAMIC != NULL)
103		atexit(cleanup);
104	else {
105		__sparc_utrap_setup();
106		_init_tls();
107	}
108#ifdef GCRT
109	atexit(_mcleanup);
110#endif
111	atexit(_fini);
112#ifdef GCRT
113	monstartup(&eprol, &etext);
114#endif
115	_init();
116	exit( main(argc, argv, env) );
117}
118
119#ifdef GCRT
120__asm__(".text");
121__asm__("eprol:");
122__asm__(".previous");
123#endif
124
125__asm__(".ident\t\"$FreeBSD: head/lib/csu/sparc64/crt1.c 204756 2010-03-05 13:28:05Z uqs $\"");
126