1 /*- 2 * Copyright 1996, 1997, 1998, 2000 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include <sys/param.h> 29 30 typedef void (*fptr)(void); 31 32 static fptr ctor_list[1] __attribute__((section(".ctors"))) = { (fptr) -1 }; 33 static fptr dtor_list[1] __attribute__((section(".dtors"))) = { (fptr) -1 }; 34 35 static void 36 do_ctors(void) 37 { 38 fptr *fpp; 39 40 for(fpp = ctor_list + 1; *fpp != 0; ++fpp) 41 ; 42 while(--fpp > ctor_list) 43 (**fpp)(); 44 } 45 46 static void 47 do_dtors(void) 48 { 49 fptr *fpp; 50 51 for(fpp = dtor_list + 1; *fpp != 0; ++fpp) 52 (**fpp)(); 53 } 54 55 /* 56 * With very large programs on some architectures (e.g., the Alpha), 57 * it is possible to get relocation overflows on the limited 58 * displacements of call/bsr instructions. It is particularly likely 59 * for the calls from _init() and _fini(), because they are in 60 * separate sections. Avoid the problem by forcing indirect calls. 61 */ 62 static void (*p_do_ctors)(void) = do_ctors; 63 static void (*p_do_dtors)(void) = do_dtors; 64 65 extern void _init(void) __attribute__((section(".init"))); 66 67 void 68 _init(void) 69 { 70 (*p_do_ctors)(); 71 } 72 73 extern void _fini(void) __attribute__((section(".fini"))); 74 75 void 76 _fini(void) 77 { 78 (*p_do_dtors)(); 79 } 80 81 #include "crtbrand.c" 82