1 /* $NetBSD: initfini.c,v 1.11 2013/08/19 22:14:37 matt Exp $ */
2
3 /*-
4 * Copyright (c) 2007 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Andrew Doran.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 __RCSID("$NetBSD: initfini.c,v 1.11 2013/08/19 22:14:37 matt Exp $");
34
35 #ifdef _LIBC
36 #include "namespace.h"
37 #endif
38
39 #include <sys/param.h>
40 #include <sys/exec.h>
41 #include <sys/tls.h>
42 #include <stdbool.h>
43
44 void _libc_init(void) __attribute__((__constructor__, __used__));
45
46 void __guard_setup(void);
47 void __libc_thr_init(void);
48 void __libc_atomic_init(void);
49 void __libc_atexit_init(void);
50 void __libc_env_init(void);
51
52 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
53 __dso_hidden void __libc_static_tls_setup(void);
54 #endif
55
56 #ifdef __weak_alias
__weak_alias(_dlauxinfo,___dlauxinfo)57 __weak_alias(_dlauxinfo,___dlauxinfo)
58 static void *__libc_dlauxinfo;
59
60 void *___dlauxinfo(void) __pure;
61
62 void *
63 ___dlauxinfo(void)
64 {
65 return __libc_dlauxinfo;
66 }
67 #endif
68
69 static bool libc_initialised;
70
71 void _libc_init(void);
72
73 /*
74 * Declare as common symbol to allow new libc with older binaries to
75 * not trigger an undefined reference.
76 */
77 struct ps_strings *__ps_strings;
78
79 /*
80 * _libc_init is called twice. The first time explicitly by crt0.o
81 * (for newer versions) and the second time as indirectly via _init().
82 */
83 void __section(".text.startup")
_libc_init(void)84 _libc_init(void)
85 {
86
87 if (libc_initialised)
88 return;
89
90 libc_initialised = 1;
91
92 if (__ps_strings != NULL)
93 __libc_dlauxinfo = __ps_strings->ps_argvstr +
94 __ps_strings->ps_nargvstr + __ps_strings->ps_nenvstr + 2;
95
96 /* For -fstack-protector */
97 __guard_setup();
98
99 #if defined(__minix) && defined(_REENTRANT)
100 /* Atomic operations */
101 __libc_atomic_init();
102 #endif /* defined(__minix) && defined(_REENTRANT) */
103
104 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
105 /* Initialize TLS for statically linked programs. */
106 __libc_static_tls_setup();
107 #endif
108
109 #if defined(__minix) && defined(_REENTRANT)
110 /* Threads */
111 __libc_thr_init();
112 #endif /* defined(__minix) && defined(_REENTRANT) */
113
114 /* Initialize the atexit mutexes */
115 __libc_atexit_init();
116
117 /* Initialize environment memory RB tree. */
118 __libc_env_init();
119 }
120