1 /* $OpenBSD: crtbegin.c,v 1.5 2001/02/03 23:11:23 art 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 "os-note-elf.h" 45 46 static void (*__CTOR_LIST__[1]) __P((void)) 47 __attribute__((section(".ctors"))) = { (void *)-1 }; /* XXX */ 48 static void (*__DTOR_LIST__[1]) __P((void)) 49 __attribute__((section(".dtors"))) = { (void *)-1 }; /* XXX */ 50 51 static void __dtors __P((void)); 52 static void __ctors __P((void)); 53 54 static void 55 __dtors() 56 { 57 unsigned long i = (unsigned long) __DTOR_LIST__[0]; 58 void (**p)(void); 59 60 if (i == -1) { 61 for (i = 1; __DTOR_LIST__[i] != NULL; i++) 62 ; 63 i--; 64 } 65 p = __DTOR_LIST__ + i; 66 while (i--) 67 (**p--)(); 68 } 69 70 static void 71 __ctors() 72 { 73 void (**p)(void) = __CTOR_LIST__ + 1; 74 75 while (*p) 76 (**p++)(); 77 } 78 79 void __init(void) __attribute__((section(".init"))); 80 void __fini(void) __attribute__((section(".fini"))); 81 82 void 83 __init() 84 { 85 static int initialized = 0; 86 87 /* 88 * Call global constructors. 89 * Arrange to call global destructors at exit. 90 */ 91 if (!initialized) { 92 initialized = 1; 93 __ctors(); 94 } 95 96 atexit(__fini); 97 } 98 99 void 100 __fini() 101 { 102 /* 103 * Call global destructors. 104 */ 105 __dtors(); 106 } 107 108