1 /*- 2 * SPDX-License-Identifier: BSD-1-Clause 3 * 4 * Copyright 2018 Andrew Turner 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 13 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 14 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 15 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 16 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 17 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 18 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 19 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 20 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 21 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 22 */ 23 24 #include <sys/param.h> 25 26 #include "crt.h" 27 28 typedef void (*crt_func)(void); 29 30 extern void *__dso_handle __hidden; 31 32 #ifndef SHARED 33 void *__dso_handle = 0; 34 #else 35 void *__dso_handle = &__dso_handle; 36 void __cxa_finalize(void *) __weak_symbol; 37 38 /* 39 * Call __cxa_finalize with the dso handle in shared objects. 40 * When we have ctors/dtors call from the dtor handler before calling 41 * any dtors, otherwise use a destructor. 42 */ 43 #ifndef HAVE_CTORS 44 __attribute__((destructor)) 45 #endif 46 static void 47 run_cxa_finalize(void) 48 { 49 50 if (__cxa_finalize != NULL) 51 __cxa_finalize(__dso_handle); 52 } 53 #endif 54 55 /* 56 * On some architectures and toolchains we may need to call the .dtors. 57 * These are called in the order they are in the ELF file. 58 */ 59 #ifdef HAVE_CTORS 60 static void __do_global_dtors_aux(void) __used; 61 62 static crt_func __CTOR_LIST__[] __section(".ctors") __used = { 63 (crt_func)-1 64 }; 65 static crt_func __DTOR_LIST__[] __section(".dtors") __used = { 66 (crt_func)-1 67 }; 68 69 extern const char startof_dtors[] __asm(".startof..dtors") 70 __weak_symbol __hidden; 71 extern const char sizeof_dtors[] __asm(".sizeof..dtors") 72 __weak_symbol __hidden; 73 74 static void 75 __do_global_dtors_aux(void) 76 { 77 crt_func fn; 78 uintptr_t dtors_end; 79 int n; 80 81 #ifdef SHARED 82 run_cxa_finalize(); 83 #endif 84 85 dtors_end = (uintptr_t)&startof_dtors + (uintptr_t)&sizeof_dtors; 86 for (n = 1;; n++) { 87 fn = __DTOR_LIST__[n]; 88 if (fn == (crt_func)0 || fn == (crt_func)-1 || (dtors_end > 0 && 89 (uintptr_t)&__DTOR_LIST__[n] >= dtors_end)) 90 break; 91 fn(); 92 } 93 } 94 95 asm ( 96 ".pushsection .fini \n" 97 "\t" INIT_CALL_SEQ(__do_global_dtors_aux) "\n" 98 ".popsection \n" 99 ); 100 #endif 101