1 /* $OpenBSD: crtbegin.c,v 1.20 2015/11/10 04:14:03 guenther Exp $ */ 2 /* $NetBSD: crtbegin.c,v 1.1 1996/09/12 16:59:03 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1993 Paul Kranenburg 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Paul Kranenburg. 19 * 4. The name of the author may not be used to endorse or promote products 20 * derived from this software without specific prior written permission 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * Run-time module for GNU C++ compiled shared libraries. 36 * 37 * The linker constructs the following arrays of pointers to global 38 * constructors and destructors. The first element contains the 39 * number of pointers in each. 40 * The tables are also null-terminated. 41 */ 42 #include <stdlib.h> 43 44 #include "md_init.h" 45 #include "os-note-elf.h" 46 #include "extern.h" 47 48 struct dwarf2_eh_object { 49 void *space[8]; 50 }; 51 52 void __register_frame_info(const void *, struct dwarf2_eh_object *) 53 __attribute__((weak)); 54 55 void __register_frame_info(const void *begin, struct dwarf2_eh_object *ob) 56 { 57 } 58 59 static const char __EH_FRAME_BEGIN__[] 60 __attribute__((section(".eh_frame"), aligned(4))) = { }; 61 62 /* 63 * java class registration hooks 64 */ 65 66 static void *__JCR_LIST__[] 67 __attribute__((section(".jcr"), aligned(sizeof(void*)))) = { }; 68 69 extern void _Jv_RegisterClasses (void *) 70 __attribute__((weak)); 71 72 73 /* 74 * Include support for the __cxa_atexit/__cxa_finalize C++ abi for 75 * gcc > 2.x. __dso_handle is NULL in the main program and a unique 76 * value for each C++ shared library. For more info on this API, see: 77 * 78 * http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor 79 */ 80 81 void *__dso_handle = NULL; 82 __asm(".hidden __dso_handle"); 83 84 long __guard_local __dso_hidden __attribute__((section(".openbsd.randomdata"))); 85 86 87 static const init_f __CTOR_LIST__[1] 88 __attribute__((section(".ctors"))) = { (void *)-1 }; /* XXX */ 89 static const init_f __DTOR_LIST__[1] 90 __attribute__((section(".dtors"))) = { (void *)-1 }; /* XXX */ 91 92 static void __dtors(void) __used; 93 static void __ctors(void) __used; 94 95 static void 96 __ctors() 97 { 98 unsigned long i = (unsigned long) __CTOR_LIST__[0]; 99 const init_f *p; 100 101 if (i == -1) { 102 for (i = 1; __CTOR_LIST__[i] != NULL; i++) 103 ; 104 i--; 105 } 106 p = __CTOR_LIST__ + i; 107 while (i--) 108 (**p--)(); 109 } 110 111 static void 112 __dtors() 113 { 114 const init_f *p = __DTOR_LIST__ + 1; 115 116 while (*p) 117 (**p++)(); 118 } 119 120 void __init(void); 121 void __fini(void); 122 static void __do_init(void) __used; 123 static void __do_fini(void) __used; 124 125 MD_SECTION_PROLOGUE(".init", __init); 126 127 MD_SECTION_PROLOGUE(".fini", __fini); 128 129 MD_SECT_CALL_FUNC(".init", __do_init); 130 MD_SECT_CALL_FUNC(".fini", __do_fini); 131 132 133 void 134 __do_init() 135 { 136 static int initialized = 0; 137 static struct dwarf2_eh_object object; 138 139 /* 140 * Call global constructors. 141 * Arrange to call global destructors at exit. 142 */ 143 if (!initialized) { 144 initialized = 1; 145 146 __register_frame_info(__EH_FRAME_BEGIN__, &object); 147 if (__JCR_LIST__[0] && _Jv_RegisterClasses) 148 _Jv_RegisterClasses(__JCR_LIST__); 149 (__ctors)(); 150 151 atexit(__fini); 152 } 153 } 154 155 void 156 __do_fini() 157 { 158 static int finalized = 0; 159 160 if (!finalized) { 161 finalized = 1; 162 /* 163 * Call global destructors. 164 */ 165 (__dtors)(); 166 } 167 } 168 169