ignore_init.c revision 331722 
1/*-
2 * Copyright 2012 Konstantin Belousov <kib@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: stable/11/lib/csu/common/ignore_init.c 331722 2018-03-29 02:50:57Z eadler $");
28
29#include "notes.h"
30
31extern int main(int, char **, char **);
32
33extern void (*__preinit_array_start[])(int, char **, char **) __hidden;
34extern void (*__preinit_array_end[])(int, char **, char **) __hidden;
35extern void (*__init_array_start[])(int, char **, char **) __hidden;
36extern void (*__init_array_end[])(int, char **, char **) __hidden;
37extern void (*__fini_array_start[])(void) __hidden;
38extern void (*__fini_array_end[])(void) __hidden;
39extern void _fini(void) __hidden;
40extern void _init(void) __hidden;
41
42extern int _DYNAMIC;
43#pragma weak _DYNAMIC
44
45char **environ;
46const char *__progname = "";
47
48static void
49finalizer(void)
50{
51	void (*fn)(void);
52	size_t array_size, n;
53
54	array_size = __fini_array_end - __fini_array_start;
55	for (n = array_size; n > 0; n--) {
56		fn = __fini_array_start[n - 1];
57		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
58			(fn)();
59	}
60	_fini();
61}
62
63static inline void
64handle_static_init(int argc, char **argv, char **env)
65{
66	void (*fn)(int, char **, char **);
67	size_t array_size, n;
68
69	if (&_DYNAMIC != NULL)
70		return;
71
72	atexit(finalizer);
73
74	array_size = __preinit_array_end - __preinit_array_start;
75	for (n = 0; n < array_size; n++) {
76		fn = __preinit_array_start[n];
77		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
78			fn(argc, argv, env);
79	}
80	_init();
81	array_size = __init_array_end - __init_array_start;
82	for (n = 0; n < array_size; n++) {
83		fn = __init_array_start[n];
84		if ((uintptr_t)fn != 0 && (uintptr_t)fn != 1)
85			fn(argc, argv, env);
86	}
87}
88
89static inline void
90handle_argv(int argc, char *argv[], char **env)
91{
92	const char *s;
93
94	if (environ == NULL)
95		environ = env;
96	if (argc > 0 && argv[0] != NULL) {
97		__progname = argv[0];
98		for (s = __progname; *s != '\0'; s++) {
99			if (*s == '/')
100				__progname = s + 1;
101		}
102	}
103}
104
105static const struct {
106	int32_t	namesz;
107	int32_t	descsz;
108	int32_t	type;
109	char	name[sizeof(NOTE_FREEBSD_VENDOR)];
110	uint32_t desc;
111} crt_noinit_tag __attribute__ ((section (NOTE_SECTION),
112    aligned(4))) __used = {
113	.namesz = sizeof(NOTE_FREEBSD_VENDOR),
114	.descsz = sizeof(uint32_t),
115	.type = CRT_NOINIT_NOTETYPE,
116	.name = NOTE_FREEBSD_VENDOR,
117	.desc = 0
118};
119