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
__do_init()31 static void __attribute__((used)) __do_init() {
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 " __USER_LABEL_PREFIX__ "__do_init\n\t"
54 ".popsection");
55 #elif defined(__riscv)
56 __asm__(".pushsection .init,\"ax\",%progbits\n\t"
57 "call " __USER_LABEL_PREFIX__ "__do_init\n\t"
58 ".popsection");
59 #elif defined(__arm__) || defined(__aarch64__)
60 __asm__(".pushsection .init,\"ax\",%progbits\n\t"
61 "bl " __USER_LABEL_PREFIX__ "__do_init\n\t"
62 ".popsection");
63 #elif defined(__powerpc__) || defined(__powerpc64__)
64 __asm__(".pushsection .init,\"ax\",@progbits\n\t"
65 "bl " __USER_LABEL_PREFIX__ "__do_init\n\t"
66 "nop\n\t"
67 ".popsection");
68 #elif defined(__sparc__)
69 __asm__(".pushsection .init,\"ax\",@progbits\n\t"
70 "call " __USER_LABEL_PREFIX__ "__do_init\n\t"
71 ".popsection");
72 #else
73 #error "crtbegin without .init_fini array unimplemented for this architecture"
74 #endif // CRT_HAS_INITFINI_ARRAY
75
76 #ifndef CRT_HAS_INITFINI_ARRAY
77 static fp __DTOR_LIST__[]
78 __attribute__((section(".dtors"), aligned(sizeof(fp)))) = {(fp)-1};
79 extern fp __DTOR_LIST_END__[];
80 #endif
81
__do_fini()82 static void __attribute__((used)) __do_fini() {
83 static _Bool __finalized;
84 if (__builtin_expect(__finalized, 0))
85 return;
86 __finalized = 1;
87
88 if (__cxa_finalize)
89 __cxa_finalize(__dso_handle);
90
91 #ifndef CRT_HAS_INITFINI_ARRAY
92 const size_t n = __DTOR_LIST_END__ - __DTOR_LIST__ - 1;
93 for (size_t i = 1; i <= n; i++) __DTOR_LIST__[i]();
94 #endif
95 #ifdef EH_USE_FRAME_REGISTRY
96 if (__deregister_frame_info)
97 __deregister_frame_info(__EH_FRAME_LIST__);
98 #endif
99 }
100
101 #ifdef CRT_HAS_INITFINI_ARRAY
102 __attribute__((section(".fini_array"),
103 used)) static void (*__fini)(void) = __do_fini;
104 #elif defined(__i386__) || defined(__x86_64__)
105 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
106 "call " __USER_LABEL_PREFIX__ "__do_fini\n\t"
107 ".popsection");
108 #elif defined(__arm__) || defined(__aarch64__)
109 __asm__(".pushsection .fini,\"ax\",%progbits\n\t"
110 "bl " __USER_LABEL_PREFIX__ "__do_fini\n\t"
111 ".popsection");
112 #elif defined(__powerpc__) || defined(__powerpc64__)
113 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
114 "bl " __USER_LABEL_PREFIX__ "__do_fini\n\t"
115 "nop\n\t"
116 ".popsection");
117 #elif defined(__riscv)
118 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
119 "call " __USER_LABEL_PREFIX__ "__do_fini\n\t"
120 ".popsection");
121 #elif defined(__sparc__)
122 __asm__(".pushsection .fini,\"ax\",@progbits\n\t"
123 "call " __USER_LABEL_PREFIX__ "__do_fini\n\t"
124 ".popsection");
125 #else
126 #error "crtbegin without .init_fini array unimplemented for this architecture"
127 #endif // CRT_HAS_INIT_FINI_ARRAY
128