1 /* $OpenBSD: crtbegin.c,v 1.24 2017/02/19 21:39:32 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 MD_DATA_SECTION_FLAGS_SYMBOL(".eh_frame", "a", const void *, __EH_FRAME_BEGIN__); 60 61 /* 62 * java class registration hooks 63 */ 64 65 MD_DATA_SECTION_FLAGS_SYMBOL(".jcr", "aw", void *, __JCR_LIST__); 66 67 extern void _Jv_RegisterClasses (void *) 68 __attribute__((weak)); 69 70 71 /* 72 * Include support for the __cxa_atexit/__cxa_finalize C++ abi for 73 * gcc > 2.x. __dso_handle is NULL in the main program and a unique 74 * value for each C++ shared library. For more info on this API, see: 75 * 76 * http://www.codesourcery.com/cxx-abi/abi.html#dso-dtor 77 */ 78 79 void *__dso_handle = NULL; 80 __asm(".hidden __dso_handle"); 81 82 long __guard_local __dso_hidden __attribute__((section(".openbsd.randomdata"))); 83 84 MD_DATA_SECTION_SYMBOL_VALUE(".ctors", init_f, __CTOR_LIST__, -1); 85 MD_DATA_SECTION_SYMBOL_VALUE(".dtors", init_f, __DTOR_LIST__, -1); 86 87 88 static void 89 __ctors(void) 90 { 91 unsigned long i = (unsigned long) __CTOR_LIST__[0]; 92 const init_f *p; 93 94 if (i == -1) { 95 for (i = 1; __CTOR_LIST__[i] != NULL; i++) 96 ; 97 i--; 98 } 99 p = __CTOR_LIST__ + i; 100 while (i--) 101 (**p--)(); 102 } 103 104 static void 105 __dtors(void) 106 { 107 const init_f *p = __DTOR_LIST__ + 1; 108 109 while (*p) 110 (**p++)(); 111 } 112 113 void __init(void); 114 void __fini(void); 115 static void __do_init(void) __used; 116 static void __do_fini(void) __used; 117 118 MD_SECTION_PROLOGUE(".init", __init); 119 120 MD_SECTION_PROLOGUE(".fini", __fini); 121 122 MD_SECT_CALL_FUNC(".init", __do_init); 123 MD_SECT_CALL_FUNC(".fini", __do_fini); 124 125 126 void 127 __do_init(void) 128 { 129 static int initialized; 130 static struct dwarf2_eh_object object; 131 132 /* 133 * Call global constructors. 134 * Arrange to call global destructors at exit. 135 */ 136 if (!initialized) { 137 initialized = 1; 138 139 __register_frame_info(__EH_FRAME_BEGIN__, &object); 140 if (__JCR_LIST__[0] && _Jv_RegisterClasses) 141 _Jv_RegisterClasses(__JCR_LIST__); 142 __ctors(); 143 144 atexit(__fini); 145 } 146 } 147 148 void 149 __do_fini(void) 150 { 151 static int finalized; 152 153 if (!finalized) { 154 finalized = 1; 155 /* 156 * Call global destructors. 157 */ 158 __dtors(); 159 } 160 } 161 162