1 //===-- crtbegin.c - Start of constructors and destructors ----------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <stddef.h> 10 11 __attribute__((visibility("hidden"))) void *__dso_handle = &__dso_handle; 12 13 #ifdef EH_USE_FRAME_REGISTRY 14 __extension__ static void *__EH_FRAME_LIST__[] 15 __attribute__((section(".eh_frame"), aligned(sizeof(void *)))) = {}; 16 17 extern void __register_frame_info(const void *, void *) __attribute__((weak)); 18 extern void *__deregister_frame_info(const void *) __attribute__((weak)); 19 #endif 20 21 #ifndef CRT_HAS_INITFINI_ARRAY 22 typedef void (*fp)(void); 23 24 static fp __CTOR_LIST__[] 25 __attribute__((section(".ctors"), aligned(sizeof(fp)))) = {(fp)-1}; 26 extern fp __CTOR_LIST_END__[]; 27 #endif 28 29 extern void __cxa_finalize(void *) __attribute__((weak)); 30 31 static void __attribute__((used)) __do_init(void) { 32 static _Bool __initialized; 33 if (__builtin_expect(__initialized, 0)) 34 return; 35 __initialized = 1; 36 37 #ifdef EH_USE_FRAME_REGISTRY 38 static struct { void *p[8]; } __object; 39 if (__register_frame_info) 40 __register_frame_info(__EH_FRAME_LIST__, &__object); 41 #endif 42 #ifndef CRT_HAS_INITFINI_ARRAY 43 const size_t n = __CTOR_LIST_END__ - __CTOR_LIST__ - 1; 44 for (size_t i = n; i >= 1; i--) __CTOR_LIST__[i](); 45 #endif 46 } 47 48 #ifdef CRT_HAS_INITFINI_ARRAY 49 __attribute__((section(".init_array"), 50 used)) static void (*__init)(void) = __do_init; 51 #elif defined(__i386__) || defined(__x86_64__) 52 __asm__(".pushsection .init,\"ax\",@progbits\n\t" 53 "call __do_init\n\t" 54 ".popsection"); 55 #elif defined(__riscv) 56 __asm__(".pushsection .init,\"ax\",%progbits\n\t" 57 "call __do_init\n\t" 58 ".popsection"); 59 #elif defined(__arm__) || defined(__aarch64__) 60 __asm__(".pushsection .init,\"ax\",%progbits\n\t" 61 "bl __do_init\n\t" 62 ".popsection"); 63 #elif defined(__mips__) 64 __asm__(".pushsection .init,\"ax\",@progbits\n\t" 65 "jal __do_init\n\t" 66 ".popsection"); 67 #elif defined(__powerpc__) || defined(__powerpc64__) 68 __asm__(".pushsection .init,\"ax\",@progbits\n\t" 69 "bl __do_init\n\t" 70 "nop\n\t" 71 ".popsection"); 72 #elif defined(__sparc__) 73 __asm__(".pushsection .init,\"ax\",@progbits\n\t" 74 "call __do_init\n\t" 75 ".popsection"); 76 #else 77 #error "crtbegin without .init_fini array unimplemented for this architecture" 78 #endif // CRT_HAS_INITFINI_ARRAY 79 80 #ifndef CRT_HAS_INITFINI_ARRAY 81 static fp __DTOR_LIST__[] 82 __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1}; 83 extern fp __DTOR_LIST_END__[]; 84 #endif 85 86 static void __attribute__((used)) __do_fini(void) { 87 static _Bool __finalized; 88 if (__builtin_expect(__finalized, 0)) 89 return; 90 __finalized = 1; 91 92 if (__cxa_finalize) 93 __cxa_finalize(__dso_handle); 94 95 #ifndef CRT_HAS_INITFINI_ARRAY 96 const size_t n = __DTOR_LIST_END__ - __DTOR_LIST__ - 1; 97 for (size_t i = 1; i <= n; i++) __DTOR_LIST__[i](); 98 #endif 99 #ifdef EH_USE_FRAME_REGISTRY 100 if (__deregister_frame_info) 101 __deregister_frame_info(__EH_FRAME_LIST__); 102 #endif 103 } 104 105 #ifdef CRT_HAS_INITFINI_ARRAY 106 __attribute__((section(".fini_array"), 107 used)) static void (*__fini)(void) = __do_fini; 108 #elif defined(__i386__) || defined(__x86_64__) 109 __asm__(".pushsection .fini,\"ax\",@progbits\n\t" 110 "call __do_fini\n\t" 111 ".popsection"); 112 #elif defined(__arm__) || defined(__aarch64__) 113 __asm__(".pushsection .fini,\"ax\",%progbits\n\t" 114 "bl __do_fini\n\t" 115 ".popsection"); 116 #elif defined(__mips__) 117 __asm__(".pushsection .fini,\"ax\",@progbits\n\t" 118 "jal __do_fini\n\t" 119 ".popsection"); 120 #elif defined(__powerpc__) || defined(__powerpc64__) 121 __asm__(".pushsection .fini,\"ax\",@progbits\n\t" 122 "bl __do_fini\n\t" 123 "nop\n\t" 124 ".popsection"); 125 #elif defined(__riscv) 126 __asm__(".pushsection .fini,\"ax\",@progbits\n\t" 127 "call __do_fini\n\t" 128 ".popsection"); 129 #elif defined(__sparc__) 130 __asm__(".pushsection .fini,\"ax\",@progbits\n\t" 131 "call __do_fini\n\t" 132 ".popsection"); 133 #else 134 #error "crtbegin without .init_fini array unimplemented for this architecture" 135 #endif // CRT_HAS_INIT_FINI_ARRAY 136