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9d13f5c4 | 1 | /* Specialized bits of code needed to support construction and |
2 | destruction of file-scope objects in C++ code. | |
fbd26352 | 3 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
31dcf09a | 4 | Contributed by Ron Guilmette (rfg@monkeys.com). |
9d13f5c4 | 5 | |
f12b58b3 | 6 | This file is part of GCC. |
9d13f5c4 | 7 | |
f12b58b3 | 8 | GCC is free software; you can redistribute it and/or modify it under |
9 | the terms of the GNU General Public License as published by the Free | |
6bc9506f | 10 | Software Foundation; either version 3, or (at your option) any later |
f12b58b3 | 11 | version. |
9d13f5c4 | 12 | |
f12b58b3 | 13 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
14 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
16 | for more details. | |
9d13f5c4 | 17 | |
6bc9506f | 18 | Under Section 7 of GPL version 3, you are granted additional |
19 | permissions described in the GCC Runtime Library Exception, version | |
20 | 3.1, as published by the Free Software Foundation. | |
21 | ||
22 | You should have received a copy of the GNU General Public License and | |
23 | a copy of the GCC Runtime Library Exception along with this program; | |
24 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
25 | <http://www.gnu.org/licenses/>. */ | |
9d13f5c4 | 26 | |
23573244 | 27 | /* This file is a bit like libgcc2.c in that it is compiled |
9d13f5c4 | 28 | multiple times and yields multiple .o files. |
29 | ||
30 | This file is useful on target machines where the object file format | |
31 | supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On | |
32 | such systems, this file allows us to avoid running collect (or any | |
33 | other such slow and painful kludge). Additionally, if the target | |
34 | system supports a .init section, this file allows us to support the | |
35 | linking of C++ code with a non-C++ main program. | |
36 | ||
37 | Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then | |
38 | this file *will* make use of the .init section. If that symbol is | |
39 | not defined however, then the .init section will not be used. | |
40 | ||
5dd605c6 | 41 | Currently, only ELF and COFF are supported. It is likely however that |
42 | ROSE could also be supported, if someone was willing to do the work to | |
43 | make whatever (small?) adaptations are needed. (Some work may be | |
44 | needed on the ROSE assembler and linker also.) | |
9d13f5c4 | 45 | |
46 | This file must be compiled with gcc. */ | |
47 | ||
fece7655 | 48 | /* Target machine header files require this define. */ |
49 | #define IN_LIBGCC2 | |
50 | ||
dd41a27b | 51 | /* FIXME: Including auto-host is incorrect, but until we have |
52 | identified the set of defines that need to go into auto-target.h, | |
53 | this will have to do. */ | |
54 | #include "auto-host.h" | |
e3108d46 | 55 | #undef caddr_t |
9ed5ef25 | 56 | #undef pid_t |
57 | #undef rlim_t | |
58 | #undef ssize_t | |
9ed5ef25 | 59 | #undef vfork |
d826737c | 60 | #include "tconfig.h" |
069631e1 | 61 | #include "tsystem.h" |
805e22b2 | 62 | #include "coretypes.h" |
63 | #include "tm.h" | |
022a2799 | 64 | #include "libgcc_tm.h" |
df4b504c | 65 | #include "unwind-dw2-fde.h" |
9d13f5c4 | 66 | |
e1ff7102 | 67 | #ifndef FORCE_CODE_SECTION_ALIGN |
68 | # define FORCE_CODE_SECTION_ALIGN | |
69 | #endif | |
70 | ||
a815e00c | 71 | #ifndef CRT_CALL_STATIC_FUNCTION |
e1ff7102 | 72 | # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ |
73 | static void __attribute__((__used__)) \ | |
74 | call_ ## FUNC (void) \ | |
75 | { \ | |
76 | asm (SECTION_OP); \ | |
77 | FUNC (); \ | |
78 | FORCE_CODE_SECTION_ALIGN \ | |
325b8c3c | 79 | asm (__LIBGCC_TEXT_SECTION_ASM_OP__); \ |
e1ff7102 | 80 | } |
a815e00c | 81 | #endif |
82 | ||
463553db | 83 | #if defined(TARGET_DL_ITERATE_PHDR) && \ |
9834d450 | 84 | (defined(__DragonFly__) || defined(__FreeBSD__) || defined(__NetBSD__)) |
463553db | 85 | #define BSD_DL_ITERATE_PHDR_AVAILABLE |
86 | #endif | |
87 | ||
fb4bac8b | 88 | #if defined(OBJECT_FORMAT_ELF) \ |
89 | && !defined(OBJECT_FORMAT_FLAT) \ | |
90 | && defined(HAVE_LD_EH_FRAME_HDR) \ | |
91 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ | |
463553db | 92 | && defined(BSD_DL_ITERATE_PHDR_AVAILABLE) |
fb4bac8b | 93 | #include <link.h> |
94 | # define USE_PT_GNU_EH_FRAME | |
95 | #endif | |
96 | ||
bdd793b2 | 97 | #if defined(OBJECT_FORMAT_ELF) \ |
98 | && !defined(OBJECT_FORMAT_FLAT) \ | |
99 | && defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR) \ | |
100 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ | |
101 | && defined(__sun__) && defined(__svr4__) | |
102 | #include <link.h> | |
103 | # define USE_PT_GNU_EH_FRAME | |
104 | #endif | |
105 | ||
f8200b2a | 106 | #if defined(OBJECT_FORMAT_ELF) \ |
107 | && !defined(OBJECT_FORMAT_FLAT) \ | |
108 | && defined(HAVE_LD_EH_FRAME_HDR) \ | |
3cfa3aba | 109 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
0d6378a9 | 110 | && defined(__GLIBC__) && __GLIBC__ >= 2 |
111 | #include <link.h> | |
b0c091c8 | 112 | /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h. |
113 | But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */ | |
114 | # if !defined(__UCLIBC__) \ | |
115 | && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ | |
0d6378a9 | 116 | || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) |
117 | # define USE_PT_GNU_EH_FRAME | |
118 | # endif | |
119 | #endif | |
93547515 | 120 | |
121 | #if defined(OBJECT_FORMAT_ELF) \ | |
122 | && !defined(OBJECT_FORMAT_FLAT) \ | |
123 | && defined(HAVE_LD_EH_FRAME_HDR) \ | |
124 | && !defined(CRTSTUFFT_O) \ | |
125 | && defined(inhibit_libc) \ | |
126 | && (defined(__GLIBC__) || defined(__gnu_linux__) || defined(__GNU__)) | |
127 | /* On systems using glibc, an inhibit_libc build of libgcc is only | |
128 | part of a bootstrap process. Build the same crt*.o as would be | |
129 | built with headers present, so that it is not necessary to build | |
130 | glibc more than once for the bootstrap to converge. */ | |
131 | # define USE_PT_GNU_EH_FRAME | |
132 | #endif | |
133 | ||
d0eb4a95 | 134 | #ifdef USE_EH_FRAME_REGISTRY_ALWAYS |
135 | # ifndef __LIBGCC_EH_FRAME_SECTION_NAME__ | |
136 | # error "Can't use explicit exception-frame-registration without __LIBGCC_EH_FRAME_SECTION_NAME__" | |
137 | # endif | |
138 | #endif | |
139 | #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) && (!defined(USE_PT_GNU_EH_FRAME) || defined(USE_EH_FRAME_REGISTRY_ALWAYS)) | |
0d6378a9 | 140 | # define USE_EH_FRAME_REGISTRY |
141 | #endif | |
325b8c3c | 142 | #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) \ |
143 | && __LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__ | |
d5720b0c | 144 | # define EH_FRAME_SECTION_CONST const |
145 | #else | |
146 | # define EH_FRAME_SECTION_CONST | |
147 | #endif | |
0d6378a9 | 148 | |
f9e6c0d4 | 149 | #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \ |
150 | && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP) | |
151 | # define HIDDEN_DTOR_LIST_END | |
152 | #endif | |
153 | ||
2d171408 | 154 | #if !defined(USE_TM_CLONE_REGISTRY) && defined(OBJECT_FORMAT_ELF) |
155 | # define USE_TM_CLONE_REGISTRY 1 | |
156 | #endif | |
157 | ||
ee055d40 | 158 | /* We do not want to add the weak attribute to the declarations of these |
df4b504c | 159 | routines in unwind-dw2-fde.h because that will cause the definition of |
160 | these symbols to be weak as well. | |
ee055d40 | 161 | |
162 | This exposes a core issue, how to handle creating weak references vs | |
163 | how to create weak definitions. Either we have to have the definition | |
164 | of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or | |
165 | have a second declaration if we want a function's references to be weak, | |
166 | but not its definition. | |
167 | ||
168 | Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until | |
0c6d8c36 | 169 | one thinks about scaling to larger problems -- i.e., the condition under |
ee055d40 | 170 | which TARGET_WEAK_ATTRIBUTE is active will eventually get far too |
171 | complicated. | |
172 | ||
173 | So, we take an approach similar to #pragma weak -- we have a second | |
174 | declaration for functions that we want to have weak references. | |
175 | ||
176 | Neither way is particularly good. */ | |
48e1416a | 177 | |
ee055d40 | 178 | /* References to __register_frame_info and __deregister_frame_info should |
179 | be weak in this file if at all possible. */ | |
49856054 | 180 | extern void __register_frame_info (const void *, struct object *) |
ee055d40 | 181 | TARGET_ATTRIBUTE_WEAK; |
49856054 | 182 | extern void __register_frame_info_bases (const void *, struct object *, |
f6338f42 | 183 | void *, void *) |
184 | TARGET_ATTRIBUTE_WEAK; | |
49856054 | 185 | extern void *__deregister_frame_info (const void *) |
ee055d40 | 186 | TARGET_ATTRIBUTE_WEAK; |
49856054 | 187 | extern void *__deregister_frame_info_bases (const void *) |
ce32d35f | 188 | TARGET_ATTRIBUTE_WEAK; |
db0f4f32 | 189 | extern void __do_global_ctors_1 (void); |
ee055d40 | 190 | |
2d171408 | 191 | /* Likewise for transactional memory clone tables. */ |
192 | extern void _ITM_registerTMCloneTable (void *, size_t) TARGET_ATTRIBUTE_WEAK; | |
193 | extern void _ITM_deregisterTMCloneTable (void *) TARGET_ATTRIBUTE_WEAK; | |
194 | ||
b7c87ff2 | 195 | #ifdef OBJECT_FORMAT_ELF |
196 | ||
197 | /* Declare a pointer to void function type. */ | |
198 | typedef void (*func_ptr) (void); | |
199 | #define STATIC static | |
200 | ||
201 | #else /* OBJECT_FORMAT_ELF */ | |
202 | ||
9d13f5c4 | 203 | #include "gbl-ctors.h" |
204 | ||
b7c87ff2 | 205 | #define STATIC |
206 | ||
207 | #endif /* OBJECT_FORMAT_ELF */ | |
9d13f5c4 | 208 | |
209 | #ifdef CRT_BEGIN | |
210 | ||
f313c0e1 | 211 | /* NOTE: In order to be able to support SVR4 shared libraries, we arrange |
212 | to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
213 | __DTOR_END__ } per root executable and also one set of these symbols | |
214 | per shared library. So in any given whole process image, we may have | |
215 | multiple definitions of each of these symbols. In order to prevent | |
216 | these definitions from conflicting with one another, and in order to | |
217 | ensure that the proper lists are used for the initialization/finalization | |
218 | of each individual shared library (respectively), we give these symbols | |
219 | only internal (i.e. `static') linkage, and we also make it a point to | |
220 | refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
221 | symbol in crtbegin.o, where they are defined. */ | |
222 | ||
ef1da805 | 223 | /* No need for .ctors/.dtors section if linker can place them in |
224 | .init_array/.fini_array section. */ | |
225 | #ifndef USE_INITFINI_ARRAY | |
f313c0e1 | 226 | /* The -1 is a flag to __do_global_[cd]tors indicating that this table |
227 | does not start with a count of elements. */ | |
228 | #ifdef CTOR_LIST_BEGIN | |
229 | CTOR_LIST_BEGIN; | |
325b8c3c | 230 | #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__) |
f313c0e1 | 231 | /* Hack: force cc1 to switch to .data section early, so that assembling |
232 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
796535a3 | 233 | static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
325b8c3c | 234 | asm (__LIBGCC_CTORS_SECTION_ASM_OP__); |
f313c0e1 | 235 | STATIC func_ptr __CTOR_LIST__[1] |
796535a3 | 236 | __attribute__ ((__used__, aligned(sizeof(func_ptr)))) |
f313c0e1 | 237 | = { (func_ptr) (-1) }; |
238 | #else | |
239 | STATIC func_ptr __CTOR_LIST__[1] | |
796535a3 | 240 | __attribute__ ((__used__, section(".ctors"), aligned(sizeof(func_ptr)))) |
f313c0e1 | 241 | = { (func_ptr) (-1) }; |
242 | #endif /* __CTOR_LIST__ alternatives */ | |
243 | ||
244 | #ifdef DTOR_LIST_BEGIN | |
245 | DTOR_LIST_BEGIN; | |
325b8c3c | 246 | #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__) |
247 | asm (__LIBGCC_DTORS_SECTION_ASM_OP__); | |
f313c0e1 | 248 | STATIC func_ptr __DTOR_LIST__[1] |
249 | __attribute__ ((aligned(sizeof(func_ptr)))) | |
250 | = { (func_ptr) (-1) }; | |
251 | #else | |
252 | STATIC func_ptr __DTOR_LIST__[1] | |
253 | __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
254 | = { (func_ptr) (-1) }; | |
255 | #endif /* __DTOR_LIST__ alternatives */ | |
ef1da805 | 256 | #endif /* USE_INITFINI_ARRAY */ |
f313c0e1 | 257 | |
fabbeb08 | 258 | #ifdef USE_EH_FRAME_REGISTRY |
f313c0e1 | 259 | /* Stick a label at the beginning of the frame unwind info so we can register |
260 | and deregister it with the exception handling library code. */ | |
d5720b0c | 261 | STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] |
325b8c3c | 262 | __attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4))) |
f313c0e1 | 263 | = { }; |
fabbeb08 | 264 | #endif /* USE_EH_FRAME_REGISTRY */ |
f313c0e1 | 265 | |
2d171408 | 266 | #if USE_TM_CLONE_REGISTRY |
267 | STATIC func_ptr __TMC_LIST__[] | |
d9ca835b | 268 | __attribute__((used, section(".tm_clone_table"), aligned(sizeof(void*)))) |
2d171408 | 269 | = { }; |
d9ca835b | 270 | # ifdef HAVE_GAS_HIDDEN |
2d171408 | 271 | extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden"))); |
d9ca835b | 272 | # endif |
273 | ||
274 | static inline void | |
275 | deregister_tm_clones (void) | |
276 | { | |
277 | void (*fn) (void *); | |
278 | ||
279 | #ifdef HAVE_GAS_HIDDEN | |
7dbfd9e6 | 280 | func_ptr *end = __TMC_END__; |
281 | // Do not optimize the comparison to false. | |
282 | __asm ("" : "+g" (end)); | |
283 | if (__TMC_LIST__ == end) | |
d9ca835b | 284 | return; |
285 | #else | |
286 | if (__TMC_LIST__[0] == NULL) | |
287 | return; | |
288 | #endif | |
289 | ||
290 | fn = _ITM_deregisterTMCloneTable; | |
291 | __asm ("" : "+r" (fn)); | |
292 | if (fn) | |
293 | fn (__TMC_LIST__); | |
294 | } | |
295 | ||
296 | static inline void | |
297 | register_tm_clones (void) | |
298 | { | |
299 | void (*fn) (void *, size_t); | |
300 | size_t size; | |
301 | ||
302 | #ifdef HAVE_GAS_HIDDEN | |
7dbfd9e6 | 303 | func_ptr *end = __TMC_END__; |
304 | // Do not optimize the comparison to false. | |
305 | __asm ("" : "+g" (end)); | |
306 | size = (end - __TMC_LIST__) / 2; | |
d9ca835b | 307 | #else |
308 | for (size = 0; __TMC_LIST__[size * 2] != NULL; size++) | |
309 | continue; | |
310 | #endif | |
311 | if (size == 0) | |
312 | return; | |
313 | ||
314 | fn = _ITM_registerTMCloneTable; | |
315 | __asm ("" : "+r" (fn)); | |
316 | if (fn) | |
317 | fn (__TMC_LIST__, size); | |
318 | } | |
2d171408 | 319 | #endif /* USE_TM_CLONE_REGISTRY */ |
320 | ||
325b8c3c | 321 | #if defined(__LIBGCC_INIT_SECTION_ASM_OP__) \ |
322 | || defined(__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__) | |
584907e7 | 323 | |
b7c87ff2 | 324 | #ifdef OBJECT_FORMAT_ELF |
325 | ||
39b6af4b | 326 | /* Declare the __dso_handle variable. It should have a unique value |
5be729c9 | 327 | in every shared-object; in a main program its value is zero. The |
328 | object should in any case be protected. This means the instance | |
329 | in one DSO or the main program is not used in another object. The | |
330 | dynamic linker takes care of this. */ | |
331 | ||
91e8ab5c | 332 | #ifdef TARGET_LIBGCC_SDATA_SECTION |
333 | extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
334 | #endif | |
5be729c9 | 335 | #ifdef HAVE_GAS_HIDDEN |
b4cf9ec1 | 336 | extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); |
5be729c9 | 337 | #endif |
39b6af4b | 338 | #ifdef CRTSTUFFS_O |
339 | void *__dso_handle = &__dso_handle; | |
340 | #else | |
341 | void *__dso_handle = 0; | |
342 | #endif | |
343 | ||
344 | /* The __cxa_finalize function may not be available so we use only a | |
345 | weak declaration. */ | |
346 | extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
347 | ||
b7c87ff2 | 348 | /* Run all the global destructors on exit from the program. */ |
48e1416a | 349 | |
b7c87ff2 | 350 | /* Some systems place the number of pointers in the first word of the |
351 | table. On SVR4 however, that word is -1. In all cases, the table is | |
352 | null-terminated. On SVR4, we start from the beginning of the list and | |
353 | invoke each per-compilation-unit destructor routine in order | |
354 | until we find that null. | |
355 | ||
356 | Note that this function MUST be static. There will be one of these | |
357 | functions in each root executable and one in each shared library, but | |
358 | although they all have the same code, each one is unique in that it | |
359 | refers to one particular associated `__DTOR_LIST__' which belongs to the | |
113f9ca7 | 360 | same particular root executable or shared library file. |
361 | ||
362 | On some systems, this routine is run more than once from the .fini, | |
363 | when exit is called recursively, so we arrange to remember where in | |
364 | the list we left off processing, and we resume at that point, | |
365 | should we be re-invoked. */ | |
b7c87ff2 | 366 | |
e1ff7102 | 367 | static void __attribute__((used)) |
aedb00bf | 368 | __do_global_dtors_aux (void) |
b7c87ff2 | 369 | { |
d24bc145 | 370 | static _Bool completed; |
dade0711 | 371 | |
f6338f42 | 372 | if (__builtin_expect (completed, 0)) |
dade0711 | 373 | return; |
374 | ||
f4513b3d | 375 | #ifdef CRTSTUFFS_O |
376 | if (__cxa_finalize) | |
39b6af4b | 377 | __cxa_finalize (__dso_handle); |
f4513b3d | 378 | #endif |
39b6af4b | 379 | |
d24bc145 | 380 | #ifdef FINI_ARRAY_SECTION_ASM_OP |
381 | /* If we are using .fini_array then destructors will be run via that | |
382 | mechanism. */ | |
f9e6c0d4 | 383 | #elif defined(HIDDEN_DTOR_LIST_END) |
384 | { | |
385 | /* Safer version that makes sure only .dtors function pointers are | |
386 | called even if the static variable is maliciously changed. */ | |
387 | extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); | |
388 | static size_t dtor_idx; | |
389 | const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; | |
06f29f53 | 390 | func_ptr *dtor_list; |
f9e6c0d4 | 391 | |
06f29f53 | 392 | __asm ("" : "=g" (dtor_list) : "0" (__DTOR_LIST__)); |
f9e6c0d4 | 393 | while (dtor_idx < max_idx) |
06f29f53 | 394 | dtor_list[++dtor_idx] (); |
f9e6c0d4 | 395 | } |
d24bc145 | 396 | #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ |
f9e6c0d4 | 397 | { |
398 | static func_ptr *p = __DTOR_LIST__ + 1; | |
399 | func_ptr f; | |
400 | ||
401 | while ((f = *p)) | |
402 | { | |
403 | p++; | |
404 | f (); | |
405 | } | |
406 | } | |
d24bc145 | 407 | #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ |
d757b8c9 | 408 | |
2d171408 | 409 | #if USE_TM_CLONE_REGISTRY |
d9ca835b | 410 | deregister_tm_clones (); |
2d171408 | 411 | #endif /* USE_TM_CLONE_REGISTRY */ |
412 | ||
0d6378a9 | 413 | #ifdef USE_EH_FRAME_REGISTRY |
6fa2a5a8 | 414 | #ifdef CRT_GET_RFIB_DATA |
ce32d35f | 415 | /* If we used the new __register_frame_info_bases interface, |
416 | make sure that we deregister from the same place. */ | |
417 | if (__deregister_frame_info_bases) | |
418 | __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
419 | #else | |
ee055d40 | 420 | if (__deregister_frame_info) |
421 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
d757b8c9 | 422 | #endif |
ce32d35f | 423 | #endif |
424 | ||
dade0711 | 425 | completed = 1; |
b7c87ff2 | 426 | } |
427 | ||
428 | /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
d24bc145 | 429 | #ifdef FINI_SECTION_ASM_OP |
e1ff7102 | 430 | CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) |
a9a8ff12 | 431 | #elif defined (FINI_ARRAY_SECTION_ASM_OP) |
d24bc145 | 432 | static func_ptr __do_global_dtors_aux_fini_array_entry[] |
a41e0f2d | 433 | __attribute__ ((__used__, section(".fini_array"), aligned(sizeof(func_ptr)))) |
d24bc145 | 434 | = { __do_global_dtors_aux }; |
a9a8ff12 | 435 | #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */ |
436 | static void __attribute__((used)) | |
437 | __do_global_dtors_aux_1 (void) | |
438 | { | |
439 | atexit (__do_global_dtors_aux); | |
440 | } | |
325b8c3c | 441 | CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, |
442 | __do_global_dtors_aux_1) | |
a9a8ff12 | 443 | #endif |
b7c87ff2 | 444 | |
2d171408 | 445 | #if defined(USE_EH_FRAME_REGISTRY) \ |
2d171408 | 446 | || defined(USE_TM_CLONE_REGISTRY) |
c4fa4c4d | 447 | /* Stick a call to __register_frame_info into the .init section. For some |
448 | reason calls with no arguments work more reliably in .init, so stick the | |
449 | call in another function. */ | |
d757b8c9 | 450 | |
e1ff7102 | 451 | static void __attribute__((used)) |
aedb00bf | 452 | frame_dummy (void) |
d757b8c9 | 453 | { |
0d6378a9 | 454 | #ifdef USE_EH_FRAME_REGISTRY |
ad87de1e | 455 | static struct object object; |
6fa2a5a8 | 456 | #ifdef CRT_GET_RFIB_DATA |
f6338f42 | 457 | void *tbase, *dbase; |
f6338f42 | 458 | tbase = 0; |
f6338f42 | 459 | CRT_GET_RFIB_DATA (dbase); |
f6338f42 | 460 | if (__register_frame_info_bases) |
461 | __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
462 | #else | |
ee055d40 | 463 | if (__register_frame_info) |
464 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
6fa2a5a8 | 465 | #endif /* CRT_GET_RFIB_DATA */ |
71fcebb2 | 466 | #endif /* USE_EH_FRAME_REGISTRY */ |
2d171408 | 467 | |
2d171408 | 468 | #if USE_TM_CLONE_REGISTRY |
d9ca835b | 469 | register_tm_clones (); |
2d171408 | 470 | #endif /* USE_TM_CLONE_REGISTRY */ |
d757b8c9 | 471 | } |
472 | ||
325b8c3c | 473 | #ifdef __LIBGCC_INIT_SECTION_ASM_OP__ |
474 | CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, frame_dummy) | |
475 | #else /* defined(__LIBGCC_INIT_SECTION_ASM_OP__) */ | |
d24bc145 | 476 | static func_ptr __frame_dummy_init_array_entry[] |
a41e0f2d | 477 | __attribute__ ((__used__, section(".init_array"), aligned(sizeof(func_ptr)))) |
d24bc145 | 478 | = { frame_dummy }; |
325b8c3c | 479 | #endif /* !defined(__LIBGCC_INIT_SECTION_ASM_OP__) */ |
bc6b11a7 | 480 | #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */ |
d757b8c9 | 481 | |
b7c87ff2 | 482 | #else /* OBJECT_FORMAT_ELF */ |
483 | ||
b13ae905 | 484 | /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o |
d8fa92ab | 485 | and once in crtend.o). It must be declared static to avoid a link |
b13ae905 | 486 | error. Here, we define __do_global_ctors as an externally callable |
487 | function. It is externally callable so that __main can invoke it when | |
488 | INVOKE__main is defined. This has the additional effect of forcing cc1 | |
489 | to switch to the .text section. */ | |
a92771b8 | 490 | |
205b5771 | 491 | static void __do_global_ctors_aux (void); |
aedb00bf | 492 | void |
493 | __do_global_ctors (void) | |
84b64a19 | 494 | { |
584907e7 | 495 | #ifdef INVOKE__main |
496 | /* If __main won't actually call __do_global_ctors then it doesn't matter | |
497 | what's inside the function. The inside of __do_global_ctors_aux is | |
498 | called automatically in that case. And the Alliant fx2800 linker | |
499 | crashes on this reference. So prevent the crash. */ | |
84b64a19 | 500 | __do_global_ctors_aux (); |
501 | #endif | |
502 | } | |
9d13f5c4 | 503 | |
325b8c3c | 504 | asm (__LIBGCC_INIT_SECTION_ASM_OP__); /* cc1 doesn't know that we are switching! */ |
9d13f5c4 | 505 | |
506 | /* A routine to invoke all of the global constructors upon entry to the | |
507 | program. We put this into the .init section (for systems that have | |
508 | such a thing) so that we can properly perform the construction of | |
1e625a2e | 509 | file-scope static-storage C++ objects within shared libraries. */ |
9d13f5c4 | 510 | |
e1ff7102 | 511 | static void __attribute__((used)) |
aedb00bf | 512 | __do_global_ctors_aux (void) /* prologue goes in .init section */ |
9d13f5c4 | 513 | { |
e1ff7102 | 514 | FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ |
325b8c3c | 515 | asm (__LIBGCC_TEXT_SECTION_ASM_OP__); /* don't put epilogue and body in .init */ |
9d13f5c4 | 516 | DO_GLOBAL_CTORS_BODY; |
75d3a87b | 517 | atexit (__do_global_dtors); |
9d13f5c4 | 518 | } |
519 | ||
b7c87ff2 | 520 | #endif /* OBJECT_FORMAT_ELF */ |
8313a782 | 521 | |
325b8c3c | 522 | #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */ |
8313a782 | 523 | |
eb7ed20c | 524 | extern void __do_global_dtors (void); |
525 | ||
8313a782 | 526 | /* This case is used by the Irix 6 port, which supports named sections but |
527 | not an SVR4-style .fini section. __do_global_dtors can be non-static | |
d757b8c9 | 528 | in this case because we protect it with -hidden_symbol. */ |
529 | ||
8313a782 | 530 | void |
aedb00bf | 531 | __do_global_dtors (void) |
8313a782 | 532 | { |
f6338f42 | 533 | func_ptr *p, f; |
534 | for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
535 | f (); | |
d757b8c9 | 536 | |
2d171408 | 537 | #if USE_TM_CLONE_REGISTRY |
d9ca835b | 538 | deregister_tm_clones (); |
2d171408 | 539 | #endif /* USE_TM_CLONE_REGISTRY */ |
540 | ||
0d6378a9 | 541 | #ifdef USE_EH_FRAME_REGISTRY |
ee055d40 | 542 | if (__deregister_frame_info) |
543 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
d757b8c9 | 544 | #endif |
8313a782 | 545 | } |
72ac783d | 546 | |
2d171408 | 547 | #if defined(USE_EH_FRAME_REGISTRY) \ |
2d171408 | 548 | || defined(USE_TM_CLONE_REGISTRY) |
584907e7 | 549 | /* A helper function for __do_global_ctors, which is in crtend.o. Here |
550 | in crtbegin.o, we can reference a couple of symbols not visible there. | |
551 | Plus, since we're before libgcc.a, we have no problems referencing | |
552 | functions from there. */ | |
72ac783d | 553 | void |
584907e7 | 554 | __do_global_ctors_1(void) |
72ac783d | 555 | { |
0d6378a9 | 556 | #ifdef USE_EH_FRAME_REGISTRY |
72ac783d | 557 | static struct object object; |
ee055d40 | 558 | if (__register_frame_info) |
559 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
b13ae905 | 560 | #endif |
2d171408 | 561 | |
2d171408 | 562 | #if USE_TM_CLONE_REGISTRY |
d9ca835b | 563 | register_tm_clones (); |
2d171408 | 564 | #endif /* USE_TM_CLONE_REGISTRY */ |
f313c0e1 | 565 | } |
bc6b11a7 | 566 | #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */ |
2cee371f | 567 | |
325b8c3c | 568 | #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */ |
584907e7 | 569 | #error "What are you doing with crtstuff.c, then?" |
570 | #endif | |
571 | ||
572 | #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
573 | ||
ef1da805 | 574 | /* No need for .ctors/.dtors section if linker can place them in |
575 | .init_array/.fini_array section. */ | |
576 | #ifndef USE_INITFINI_ARRAY | |
584907e7 | 577 | /* Put a word containing zero at the end of each of our two lists of function |
578 | addresses. Note that the words defined here go into the .ctors and .dtors | |
579 | sections of the crtend.o file, and since that file is always linked in | |
580 | last, these words naturally end up at the very ends of the two lists | |
581 | contained in these two sections. */ | |
582 | ||
583 | #ifdef CTOR_LIST_END | |
584 | CTOR_LIST_END; | |
325b8c3c | 585 | #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__) |
584907e7 | 586 | /* Hack: force cc1 to switch to .data section early, so that assembling |
587 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
796535a3 | 588 | static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
325b8c3c | 589 | asm (__LIBGCC_CTORS_SECTION_ASM_OP__); |
584907e7 | 590 | STATIC func_ptr __CTOR_END__[1] |
591 | __attribute__((aligned(sizeof(func_ptr)))) | |
592 | = { (func_ptr) 0 }; | |
593 | #else | |
594 | STATIC func_ptr __CTOR_END__[1] | |
595 | __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
596 | = { (func_ptr) 0 }; | |
597 | #endif | |
598 | ||
599 | #ifdef DTOR_LIST_END | |
600 | DTOR_LIST_END; | |
f9e6c0d4 | 601 | #elif defined(HIDDEN_DTOR_LIST_END) |
325b8c3c | 602 | #ifdef __LIBGCC_DTORS_SECTION_ASM_OP__ |
603 | asm (__LIBGCC_DTORS_SECTION_ASM_OP__); | |
f9e6c0d4 | 604 | #endif |
605 | func_ptr __DTOR_END__[1] | |
bc200246 | 606 | __attribute__ ((used, |
325b8c3c | 607 | #ifndef __LIBGCC_DTORS_SECTION_ASM_OP__ |
f9e6c0d4 | 608 | section(".dtors"), |
609 | #endif | |
610 | aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
611 | = { (func_ptr) 0 }; | |
325b8c3c | 612 | #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__) |
613 | asm (__LIBGCC_DTORS_SECTION_ASM_OP__); | |
584907e7 | 614 | STATIC func_ptr __DTOR_END__[1] |
bc200246 | 615 | __attribute__ ((used, aligned(sizeof(func_ptr)))) |
584907e7 | 616 | = { (func_ptr) 0 }; |
617 | #else | |
618 | STATIC func_ptr __DTOR_END__[1] | |
bc200246 | 619 | __attribute__((used, section(".dtors"), aligned(sizeof(func_ptr)))) |
584907e7 | 620 | = { (func_ptr) 0 }; |
621 | #endif | |
ef1da805 | 622 | #endif /* USE_INITFINI_ARRAY */ |
9d13f5c4 | 623 | |
325b8c3c | 624 | #ifdef __LIBGCC_EH_FRAME_SECTION_NAME__ |
584907e7 | 625 | /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; |
626 | this would be the 'length' field in a real FDE. */ | |
743a6f47 | 627 | # if __INT_MAX__ == 2147483647 |
628 | typedef int int32; | |
629 | # elif __LONG_MAX__ == 2147483647 | |
630 | typedef long int32; | |
631 | # elif __SHRT_MAX__ == 2147483647 | |
632 | typedef short int32; | |
633 | # else | |
634 | # error "Missing a 4 byte integer" | |
635 | # endif | |
636 | STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
325b8c3c | 637 | __attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__), |
743a6f47 | 638 | aligned(sizeof(int32)))) |
584907e7 | 639 | = { 0 }; |
325b8c3c | 640 | #endif /* __LIBGCC_EH_FRAME_SECTION_NAME__ */ |
584907e7 | 641 | |
2d171408 | 642 | #if USE_TM_CLONE_REGISTRY |
d9ca835b | 643 | # ifndef HAVE_GAS_HIDDEN |
644 | static | |
645 | # endif | |
2d171408 | 646 | func_ptr __TMC_END__[] |
d9ca835b | 647 | __attribute__((used, section(".tm_clone_table"), aligned(sizeof(void *)))) |
648 | # ifdef HAVE_GAS_HIDDEN | |
649 | __attribute__((__visibility__ ("hidden"))) = { }; | |
650 | # else | |
651 | = { 0, 0 }; | |
652 | # endif | |
2d171408 | 653 | #endif /* USE_TM_CLONE_REGISTRY */ |
654 | ||
325b8c3c | 655 | #ifdef __LIBGCC_INIT_ARRAY_SECTION_ASM_OP__ |
d24bc145 | 656 | |
657 | /* If we are using .init_array, there is nothing to do. */ | |
658 | ||
325b8c3c | 659 | #elif defined(__LIBGCC_INIT_SECTION_ASM_OP__) |
9d13f5c4 | 660 | |
b7c87ff2 | 661 | #ifdef OBJECT_FORMAT_ELF |
e1ff7102 | 662 | static void __attribute__((used)) |
aedb00bf | 663 | __do_global_ctors_aux (void) |
b7c87ff2 | 664 | { |
665 | func_ptr *p; | |
666 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
667 | (*p) (); | |
668 | } | |
669 | ||
670 | /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
325b8c3c | 671 | CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, __do_global_ctors_aux) |
b7c87ff2 | 672 | #else /* OBJECT_FORMAT_ELF */ |
673 | ||
674 | /* Stick the real initialization code, followed by a normal sort of | |
675 | function epilogue at the very end of the .init section for this | |
676 | entire root executable file or for this entire shared library file. | |
677 | ||
678 | Note that we use some tricks here to get *just* the body and just | |
679 | a function epilogue (but no function prologue) into the .init | |
c3418f42 | 680 | section of the crtend.o file. Specifically, we switch to the .text |
b7c87ff2 | 681 | section, start to define a function, and then we switch to the .init |
682 | section just before the body code. | |
683 | ||
684 | Earlier on, we put the corresponding function prologue into the .init | |
685 | section of the crtbegin.o file (which will be linked in first). | |
686 | ||
687 | Note that we want to invoke all constructors for C++ file-scope static- | |
688 | storage objects AFTER any other possible initialization actions which | |
689 | may be performed by the code in the .init section contributions made by | |
690 | other libraries, etc. That's because those other initializations may | |
691 | include setup operations for very primitive things (e.g. initializing | |
692 | the state of the floating-point coprocessor, etc.) which should be done | |
a92771b8 | 693 | before we start to execute any of the user's code. */ |
9d13f5c4 | 694 | |
695 | static void | |
aedb00bf | 696 | __do_global_ctors_aux (void) /* prologue goes in .text section */ |
9d13f5c4 | 697 | { |
325b8c3c | 698 | asm (__LIBGCC_INIT_SECTION_ASM_OP__); |
9d13f5c4 | 699 | DO_GLOBAL_CTORS_BODY; |
75d3a87b | 700 | atexit (__do_global_dtors); |
997d68fe | 701 | } /* epilogue and body go in .init section */ |
702 | ||
e1ff7102 | 703 | FORCE_CODE_SECTION_ALIGN |
325b8c3c | 704 | asm (__LIBGCC_TEXT_SECTION_ASM_OP__); |
9d13f5c4 | 705 | |
b7c87ff2 | 706 | #endif /* OBJECT_FORMAT_ELF */ |
707 | ||
325b8c3c | 708 | #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */ |
8313a782 | 709 | |
eb7ed20c | 710 | extern void __do_global_ctors (void); |
711 | ||
8313a782 | 712 | /* This case is used by the Irix 6 port, which supports named sections but |
713 | not an SVR4-style .init section. __do_global_ctors can be non-static | |
d757b8c9 | 714 | in this case because we protect it with -hidden_symbol. */ |
8313a782 | 715 | void |
aedb00bf | 716 | __do_global_ctors (void) |
8313a782 | 717 | { |
718 | func_ptr *p; | |
2d171408 | 719 | #if defined(USE_EH_FRAME_REGISTRY) \ |
2d171408 | 720 | || defined(USE_TM_CLONE_REGISTRY) |
584907e7 | 721 | __do_global_ctors_1(); |
d757b8c9 | 722 | #endif |
8313a782 | 723 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
724 | (*p) (); | |
725 | } | |
b7c87ff2 | 726 | |
325b8c3c | 727 | #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */ |
584907e7 | 728 | #error "What are you doing with crtstuff.c, then?" |
b13ae905 | 729 | #endif |
9d13f5c4 | 730 | |
584907e7 | 731 | #else /* ! CRT_BEGIN && ! CRT_END */ |
732 | #error "One of CRT_BEGIN or CRT_END must be defined." | |
b13ae905 | 733 | #endif |