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/cdefs.h> 25 #include <sys/param.h> 26 27 #include "crt.h" 28 29 typedef void (*crt_func)(void); 30 31 extern void *__dso_handle __hidden; 32 33 #ifndef SHARED 34 void *__dso_handle = 0; 35 #else 36 void *__dso_handle = &__dso_handle; 37 void __cxa_finalize(void *) __weak_symbol; 38 39 /* 40 * Call __cxa_finalize with the dso handle in shared objects. 41 * When we have ctors/dtors call from the dtor handler before calling 42 * any dtors, otherwise use a destructor. 43 */ 44 #ifndef HAVE_CTORS 45 __attribute__((destructor)) 46 #endif 47 static void 48 run_cxa_finalize(void) 49 { 50 51 if (__cxa_finalize != NULL) 52 __cxa_finalize(__dso_handle); 53 } 54 #endif 55 56 /* 57 * On some architectures and toolchains we may need to call the .dtors. 58 * These are called in the order they are in the ELF file. 59 */ 60 #ifdef HAVE_CTORS 61 static void __do_global_dtors_aux(void) __used; 62 63 static crt_func __CTOR_LIST__[] __section(".ctors") __used = { 64 (crt_func)-1 65 }; 66 static crt_func __DTOR_LIST__[] __section(".dtors") __used = { 67 (crt_func)-1 68 }; 69 70 static void 71 __do_global_dtors_aux(void) 72 { 73 crt_func fn; 74 int n; 75 76 #ifdef SHARED 77 run_cxa_finalize(); 78 #endif 79 80 for (n = 1;; n++) { 81 fn = __DTOR_LIST__[n]; 82 if (fn == (crt_func)0 || fn == (crt_func)-1) 83 break; 84 fn(); 85 } 86 } 87 88 asm ( 89 ".pushsection .fini \n" 90 "\t" INIT_CALL_SEQ(__do_global_dtors_aux) "\n" 91 ".popsection \n" 92 ); 93 #endif 94 95 /* 96 * Handler for gcj. These provide a _Jv_RegisterClasses function and fill 97 * out the .jcr section. We just need to call this function with a pointer 98 * to the appropriate section. 99 */ 100 extern void _Jv_RegisterClasses(void *) __weak_symbol; 101 static void register_classes(void) __used; 102 103 static crt_func __JCR_LIST__[] __section(".jcr") __used = { }; 104 105 #ifndef CTORS_CONSTRUCTORS 106 __attribute__((constructor)) 107 #endif 108 static void 109 register_classes(void) 110 { 111 112 if (_Jv_RegisterClasses != NULL && __JCR_LIST__[0] != 0) 113 _Jv_RegisterClasses(__JCR_LIST__); 114 } 115 116 /* 117 * We can't use constructors when they use the .ctors section as they may be 118 * placed before __CTOR_LIST__. 119 */ 120 #ifdef CTORS_CONSTRUCTORS 121 asm ( 122 ".pushsection .init \n" 123 "\t" INIT_CALL_SEQ(register_classes) "\n" 124 ".popsection \n" 125 ); 126 #endif 127