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 #if !defined(__minix) 42 #include <sys/tls.h> 43 #endif /* !defined(__minix) */ 44 #include <stdbool.h> 45 46 void _libc_init(void) __attribute__((__constructor__, __used__)); 47 48 void __guard_setup(void); 49 void __libc_thr_init(void); 50 void __libc_atomic_init(void); 51 void __libc_atexit_init(void); 52 void __libc_env_init(void); 53 54 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) 55 __dso_hidden void __libc_static_tls_setup(void); 56 #endif 57 58 #ifdef __weak_alias 59 __weak_alias(_dlauxinfo,___dlauxinfo) 60 static void *__libc_dlauxinfo; 61 62 void *___dlauxinfo(void) __pure; 63 64 void * 65 ___dlauxinfo(void) 66 { 67 return __libc_dlauxinfo; 68 } 69 #endif 70 71 static bool libc_initialised; 72 73 void _libc_init(void); 74 75 /* 76 * Declare as common symbol to allow new libc with older binaries to 77 * not trigger an undefined reference. 78 */ 79 struct ps_strings *__ps_strings; 80 81 /* 82 * _libc_init is called twice. The first time explicitly by crt0.o 83 * (for newer versions) and the second time as indirectly via _init(). 84 */ 85 void __section(".text.startup") 86 _libc_init(void) 87 { 88 89 if (libc_initialised) 90 return; 91 92 libc_initialised = 1; 93 94 if (__ps_strings != NULL) 95 __libc_dlauxinfo = __ps_strings->ps_argvstr + 96 __ps_strings->ps_nargvstr + __ps_strings->ps_nenvstr + 2; 97 98 /* For -fstack-protector */ 99 __guard_setup(); 100 101 #ifdef _REENTRANT 102 /* Atomic operations */ 103 __libc_atomic_init(); 104 #endif 105 106 #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 110 111 #ifdef _REENTRANT 112 /* Threads */ 113 __libc_thr_init(); 114 #endif 115 116 /* Initialize the atexit mutexes */ 117 __libc_atexit_init(); 118 119 /* Initialize environment memory RB tree. */ 120 __libc_env_init(); 121 } 122