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 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") 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 /* Atomic operations */ 100 __libc_atomic_init(); 101 102 #if defined(__HAVE_TLS_VARIANT_I) || defined(__HAVE_TLS_VARIANT_II) 103 /* Initialize TLS for statically linked programs. */ 104 __libc_static_tls_setup(); 105 #endif 106 107 /* Threads */ 108 __libc_thr_init(); 109 110 /* Initialize the atexit mutexes */ 111 __libc_atexit_init(); 112 113 /* Initialize environment memory RB tree. */ 114 __libc_env_init(); 115 } 116