Annotation of src/lib/libc/misc/initfini.c, Revision 1.12
1.12 ! dholland 1: /* $NetBSD: initfini.c,v 1.11 2013/08/19 22:14:37 matt Exp $ */
1.1 ad 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:
1.2 ad 32: #include <sys/cdefs.h>
1.12 ! dholland 33: __RCSID("$NetBSD: initfini.c,v 1.11 2013/08/19 22:14:37 matt Exp $");
1.2 ad 34:
35: #ifdef _LIBC
36: #include "namespace.h"
37: #endif
38:
1.8 joerg 39: #include <sys/param.h>
40: #include <sys/exec.h>
1.9 joerg 41: #include <sys/tls.h>
1.8 joerg 42: #include <stdbool.h>
43:
44: void _libc_init(void) __attribute__((__constructor__, __used__));
1.1 ad 45:
46: void __guard_setup(void);
47: void __libc_thr_init(void);
1.3 ad 48: void __libc_atomic_init(void);
1.4 xtraeme 49: void __libc_atexit_init(void);
1.7 tron 50: void __libc_env_init(void);
1.1 ad 51:
1.9 joerg 52: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
53: __dso_hidden void __libc_static_tls_setup(void);
54: #endif
55:
1.10 joerg 56: #ifdef __weak_alias
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:
1.8 joerg 69: static bool libc_initialised;
70:
71: void _libc_init(void);
72:
1.10 joerg 73: /*
74: * Declare as common symbol to allow new libc with older binaries to
75: * not trigger an undefined reference.
76: */
1.8 joerg 77: struct ps_strings *__ps_strings;
78:
79: /*
1.12 ! dholland 80: * _libc_init is called twice. One call comes explicitly from crt0.o
! 81: * (for newer versions) and the other is via global constructor handling.
! 82: *
! 83: * In static binaries the explicit call is first; in dynamically linked
! 84: * binaries the global constructors of libc are called from ld.elf_so
! 85: * before crt0.o is reached.
1.8 joerg 86: */
1.11 matt 87: void __section(".text.startup")
1.8 joerg 88: _libc_init(void)
1.1 ad 89: {
90:
1.8 joerg 91: if (libc_initialised)
92: return;
93:
94: libc_initialised = 1;
95:
96: if (__ps_strings != NULL)
1.10 joerg 97: __libc_dlauxinfo = __ps_strings->ps_argvstr +
1.8 joerg 98: __ps_strings->ps_nargvstr + __ps_strings->ps_nenvstr + 2;
99:
1.1 ad 100: /* For -fstack-protector */
101: __guard_setup();
102:
1.3 ad 103: /* Atomic operations */
104: __libc_atomic_init();
105:
1.9 joerg 106: #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II)
107: /* Initialize TLS for statically linked programs. */
108: __libc_static_tls_setup();
109: #endif
110:
1.1 ad 111: /* Threads */
112: __libc_thr_init();
1.4 xtraeme 113:
114: /* Initialize the atexit mutexes */
115: __libc_atexit_init();
1.7 tron 116:
117: /* Initialize environment memory RB tree. */
118: __libc_env_init();
1.1 ad 119: }
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