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dc17e9e9 RS |
1 | /* Specialized bits of code needed to support construction and |
2 | destruction of file-scope objects in C++ code. | |
818ab71a | 3 | Copyright (C) 1991-2016 Free Software Foundation, Inc. |
d0f8fcea | 4 | Contributed by Ron Guilmette (rfg@monkeys.com). |
dc17e9e9 | 5 | |
1322177d | 6 | This file is part of GCC. |
dc17e9e9 | 7 | |
1322177d LB |
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 | |
748086b7 | 10 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 11 | version. |
dc17e9e9 | 12 | |
1322177d LB |
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. | |
dc17e9e9 | 17 | |
748086b7 JJ |
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/>. */ | |
dc17e9e9 | 26 | |
7857f134 | 27 | /* This file is a bit like libgcc2.c in that it is compiled |
dc17e9e9 RS |
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 | ||
37ce5b86 CH |
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.) | |
dc17e9e9 RS |
45 | |
46 | This file must be compiled with gcc. */ | |
47 | ||
56d6849d NS |
48 | /* Target machine header files require this define. */ |
49 | #define IN_LIBGCC2 | |
50 | ||
9d48ad93 NS |
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" | |
c6f9ea3b | 55 | #undef caddr_t |
3bea02d1 JM |
56 | #undef pid_t |
57 | #undef rlim_t | |
58 | #undef ssize_t | |
3bea02d1 | 59 | #undef vfork |
eaf4e618 | 60 | #include "tconfig.h" |
2e39bdbe | 61 | #include "tsystem.h" |
4977bab6 ZW |
62 | #include "coretypes.h" |
63 | #include "tm.h" | |
852b75ed | 64 | #include "libgcc_tm.h" |
52a11cbf | 65 | #include "unwind-dw2-fde.h" |
dc17e9e9 | 66 | |
cea3bd3e RH |
67 | #ifndef FORCE_CODE_SECTION_ALIGN |
68 | # define FORCE_CODE_SECTION_ALIGN | |
69 | #endif | |
70 | ||
036cfb36 | 71 | #ifndef CRT_CALL_STATIC_FUNCTION |
cea3bd3e RH |
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 \ | |
53d68b9f | 79 | asm (__LIBGCC_TEXT_SECTION_ASM_OP__); \ |
cea3bd3e | 80 | } |
036cfb36 AO |
81 | #endif |
82 | ||
dbed5a9b JM |
83 | #if defined(TARGET_DL_ITERATE_PHDR) && \ |
84 | (defined(__DragonFly__) || defined(__FreeBSD__)) | |
85 | #define BSD_DL_ITERATE_PHDR_AVAILABLE | |
86 | #endif | |
87 | ||
2208d2ac LR |
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) \ | |
dbed5a9b | 92 | && defined(BSD_DL_ITERATE_PHDR_AVAILABLE) |
2208d2ac LR |
93 | #include <link.h> |
94 | # define USE_PT_GNU_EH_FRAME | |
95 | #endif | |
96 | ||
6961669f RO |
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 | ||
abe92a04 RS |
106 | #if defined(OBJECT_FORMAT_ELF) \ |
107 | && !defined(OBJECT_FORMAT_FLAT) \ | |
108 | && defined(HAVE_LD_EH_FRAME_HDR) \ | |
72c7c913 | 109 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
275b60d6 JJ |
110 | && defined(__GLIBC__) && __GLIBC__ >= 2 |
111 | #include <link.h> | |
212db394 JZ |
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) \ | |
275b60d6 JJ |
116 | || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) |
117 | # define USE_PT_GNU_EH_FRAME | |
118 | # endif | |
119 | #endif | |
d2468141 JM |
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 | ||
598a1586 HPN |
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)) | |
275b60d6 JJ |
140 | # define USE_EH_FRAME_REGISTRY |
141 | #endif | |
53d68b9f JM |
142 | #if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) \ |
143 | && __LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__ | |
96d0f4dc JJ |
144 | # define EH_FRAME_SECTION_CONST const |
145 | #else | |
146 | # define EH_FRAME_SECTION_CONST | |
147 | #endif | |
275b60d6 | 148 | |
3fc95619 UD |
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 | ||
b0dc7e4c RH |
154 | #if !defined(USE_TM_CLONE_REGISTRY) && defined(OBJECT_FORMAT_ELF) |
155 | # define USE_TM_CLONE_REGISTRY 1 | |
156 | #endif | |
157 | ||
8f08ea1e | 158 | /* We do not want to add the weak attribute to the declarations of these |
52a11cbf RH |
159 | routines in unwind-dw2-fde.h because that will cause the definition of |
160 | these symbols to be weak as well. | |
8f08ea1e L |
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 | |
454ff5cb | 169 | one thinks about scaling to larger problems -- i.e., the condition under |
8f08ea1e L |
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. */ | |
b8698a0f | 177 | |
8f08ea1e L |
178 | /* References to __register_frame_info and __deregister_frame_info should |
179 | be weak in this file if at all possible. */ | |
a30794da | 180 | extern void __register_frame_info (const void *, struct object *) |
8f08ea1e | 181 | TARGET_ATTRIBUTE_WEAK; |
a30794da | 182 | extern void __register_frame_info_bases (const void *, struct object *, |
1066e2b5 RH |
183 | void *, void *) |
184 | TARGET_ATTRIBUTE_WEAK; | |
a30794da | 185 | extern void *__deregister_frame_info (const void *) |
8f08ea1e | 186 | TARGET_ATTRIBUTE_WEAK; |
a30794da | 187 | extern void *__deregister_frame_info_bases (const void *) |
101fa48c | 188 | TARGET_ATTRIBUTE_WEAK; |
525996eb | 189 | extern void __do_global_ctors_1 (void); |
8f08ea1e | 190 | |
213f974a RH |
191 | /* Likewise for _Jv_RegisterClasses. */ |
192 | extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
193 | ||
b0dc7e4c RH |
194 | /* Likewise for transactional memory clone tables. */ |
195 | extern void _ITM_registerTMCloneTable (void *, size_t) TARGET_ATTRIBUTE_WEAK; | |
196 | extern void _ITM_deregisterTMCloneTable (void *) TARGET_ATTRIBUTE_WEAK; | |
197 | ||
68d69835 JM |
198 | #ifdef OBJECT_FORMAT_ELF |
199 | ||
200 | /* Declare a pointer to void function type. */ | |
201 | typedef void (*func_ptr) (void); | |
202 | #define STATIC static | |
203 | ||
204 | #else /* OBJECT_FORMAT_ELF */ | |
205 | ||
dc17e9e9 RS |
206 | #include "gbl-ctors.h" |
207 | ||
68d69835 JM |
208 | #define STATIC |
209 | ||
210 | #endif /* OBJECT_FORMAT_ELF */ | |
dc17e9e9 RS |
211 | |
212 | #ifdef CRT_BEGIN | |
213 | ||
213f974a RH |
214 | /* NOTE: In order to be able to support SVR4 shared libraries, we arrange |
215 | to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
216 | __DTOR_END__ } per root executable and also one set of these symbols | |
217 | per shared library. So in any given whole process image, we may have | |
218 | multiple definitions of each of these symbols. In order to prevent | |
219 | these definitions from conflicting with one another, and in order to | |
220 | ensure that the proper lists are used for the initialization/finalization | |
221 | of each individual shared library (respectively), we give these symbols | |
222 | only internal (i.e. `static') linkage, and we also make it a point to | |
223 | refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
224 | symbol in crtbegin.o, where they are defined. */ | |
225 | ||
9ce7ad7f L |
226 | /* No need for .ctors/.dtors section if linker can place them in |
227 | .init_array/.fini_array section. */ | |
228 | #ifndef USE_INITFINI_ARRAY | |
213f974a RH |
229 | /* The -1 is a flag to __do_global_[cd]tors indicating that this table |
230 | does not start with a count of elements. */ | |
231 | #ifdef CTOR_LIST_BEGIN | |
232 | CTOR_LIST_BEGIN; | |
53d68b9f | 233 | #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__) |
213f974a RH |
234 | /* Hack: force cc1 to switch to .data section early, so that assembling |
235 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
e4fa83d3 | 236 | static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
53d68b9f | 237 | asm (__LIBGCC_CTORS_SECTION_ASM_OP__); |
213f974a | 238 | STATIC func_ptr __CTOR_LIST__[1] |
e4fa83d3 | 239 | __attribute__ ((__used__, aligned(sizeof(func_ptr)))) |
213f974a RH |
240 | = { (func_ptr) (-1) }; |
241 | #else | |
242 | STATIC func_ptr __CTOR_LIST__[1] | |
e4fa83d3 | 243 | __attribute__ ((__used__, section(".ctors"), aligned(sizeof(func_ptr)))) |
213f974a RH |
244 | = { (func_ptr) (-1) }; |
245 | #endif /* __CTOR_LIST__ alternatives */ | |
246 | ||
247 | #ifdef DTOR_LIST_BEGIN | |
248 | DTOR_LIST_BEGIN; | |
53d68b9f JM |
249 | #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__) |
250 | asm (__LIBGCC_DTORS_SECTION_ASM_OP__); | |
213f974a RH |
251 | STATIC func_ptr __DTOR_LIST__[1] |
252 | __attribute__ ((aligned(sizeof(func_ptr)))) | |
253 | = { (func_ptr) (-1) }; | |
254 | #else | |
255 | STATIC func_ptr __DTOR_LIST__[1] | |
256 | __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
257 | = { (func_ptr) (-1) }; | |
258 | #endif /* __DTOR_LIST__ alternatives */ | |
9ce7ad7f | 259 | #endif /* USE_INITFINI_ARRAY */ |
213f974a | 260 | |
618939de | 261 | #ifdef USE_EH_FRAME_REGISTRY |
213f974a RH |
262 | /* Stick a label at the beginning of the frame unwind info so we can register |
263 | and deregister it with the exception handling library code. */ | |
96d0f4dc | 264 | STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] |
53d68b9f | 265 | __attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4))) |
213f974a | 266 | = { }; |
618939de | 267 | #endif /* USE_EH_FRAME_REGISTRY */ |
213f974a | 268 | |
b0dc7e4c RH |
269 | #if USE_TM_CLONE_REGISTRY |
270 | STATIC func_ptr __TMC_LIST__[] | |
7546aa9d | 271 | __attribute__((used, section(".tm_clone_table"), aligned(sizeof(void*)))) |
b0dc7e4c | 272 | = { }; |
7546aa9d | 273 | # ifdef HAVE_GAS_HIDDEN |
b0dc7e4c | 274 | extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden"))); |
7546aa9d RH |
275 | # endif |
276 | ||
277 | static inline void | |
278 | deregister_tm_clones (void) | |
279 | { | |
280 | void (*fn) (void *); | |
281 | ||
282 | #ifdef HAVE_GAS_HIDDEN | |
283 | if (__TMC_END__ - __TMC_LIST__ == 0) | |
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 | |
303 | size = (__TMC_END__ - __TMC_LIST__) / 2; | |
304 | #else | |
305 | for (size = 0; __TMC_LIST__[size * 2] != NULL; size++) | |
306 | continue; | |
307 | #endif | |
308 | if (size == 0) | |
309 | return; | |
310 | ||
311 | fn = _ITM_registerTMCloneTable; | |
312 | __asm ("" : "+r" (fn)); | |
313 | if (fn) | |
314 | fn (__TMC_LIST__, size); | |
315 | } | |
b0dc7e4c RH |
316 | #endif /* USE_TM_CLONE_REGISTRY */ |
317 | ||
53d68b9f JM |
318 | #if defined(__LIBGCC_INIT_SECTION_ASM_OP__) \ |
319 | || defined(__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__) | |
29d2c7a5 | 320 | |
68d69835 JM |
321 | #ifdef OBJECT_FORMAT_ELF |
322 | ||
fc693822 | 323 | /* Declare the __dso_handle variable. It should have a unique value |
6a9c5260 UD |
324 | in every shared-object; in a main program its value is zero. The |
325 | object should in any case be protected. This means the instance | |
326 | in one DSO or the main program is not used in another object. The | |
327 | dynamic linker takes care of this. */ | |
328 | ||
a0cfeb0f DD |
329 | #ifdef TARGET_LIBGCC_SDATA_SECTION |
330 | extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
331 | #endif | |
6a9c5260 | 332 | #ifdef HAVE_GAS_HIDDEN |
47bd70b5 | 333 | extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); |
6a9c5260 | 334 | #endif |
fc693822 MM |
335 | #ifdef CRTSTUFFS_O |
336 | void *__dso_handle = &__dso_handle; | |
337 | #else | |
338 | void *__dso_handle = 0; | |
339 | #endif | |
340 | ||
341 | /* The __cxa_finalize function may not be available so we use only a | |
342 | weak declaration. */ | |
343 | extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
344 | ||
68d69835 | 345 | /* Run all the global destructors on exit from the program. */ |
b8698a0f | 346 | |
68d69835 JM |
347 | /* Some systems place the number of pointers in the first word of the |
348 | table. On SVR4 however, that word is -1. In all cases, the table is | |
349 | null-terminated. On SVR4, we start from the beginning of the list and | |
350 | invoke each per-compilation-unit destructor routine in order | |
351 | until we find that null. | |
352 | ||
353 | Note that this function MUST be static. There will be one of these | |
354 | functions in each root executable and one in each shared library, but | |
355 | although they all have the same code, each one is unique in that it | |
356 | refers to one particular associated `__DTOR_LIST__' which belongs to the | |
b40b9d93 MS |
357 | same particular root executable or shared library file. |
358 | ||
359 | On some systems, this routine is run more than once from the .fini, | |
360 | when exit is called recursively, so we arrange to remember where in | |
361 | the list we left off processing, and we resume at that point, | |
362 | should we be re-invoked. */ | |
68d69835 | 363 | |
cea3bd3e | 364 | static void __attribute__((used)) |
3cc22c31 | 365 | __do_global_dtors_aux (void) |
68d69835 | 366 | { |
7abc66b1 | 367 | static _Bool completed; |
5041a61c | 368 | |
1066e2b5 | 369 | if (__builtin_expect (completed, 0)) |
5041a61c JL |
370 | return; |
371 | ||
2a14e214 MM |
372 | #ifdef CRTSTUFFS_O |
373 | if (__cxa_finalize) | |
fc693822 | 374 | __cxa_finalize (__dso_handle); |
2a14e214 | 375 | #endif |
fc693822 | 376 | |
7abc66b1 JB |
377 | #ifdef FINI_ARRAY_SECTION_ASM_OP |
378 | /* If we are using .fini_array then destructors will be run via that | |
379 | mechanism. */ | |
3fc95619 UD |
380 | #elif defined(HIDDEN_DTOR_LIST_END) |
381 | { | |
382 | /* Safer version that makes sure only .dtors function pointers are | |
383 | called even if the static variable is maliciously changed. */ | |
384 | extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); | |
385 | static size_t dtor_idx; | |
386 | const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; | |
2405e0ea | 387 | func_ptr *dtor_list; |
3fc95619 | 388 | |
2405e0ea | 389 | __asm ("" : "=g" (dtor_list) : "0" (__DTOR_LIST__)); |
3fc95619 | 390 | while (dtor_idx < max_idx) |
2405e0ea | 391 | dtor_list[++dtor_idx] (); |
3fc95619 | 392 | } |
7abc66b1 | 393 | #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ |
3fc95619 UD |
394 | { |
395 | static func_ptr *p = __DTOR_LIST__ + 1; | |
396 | func_ptr f; | |
397 | ||
398 | while ((f = *p)) | |
399 | { | |
400 | p++; | |
401 | f (); | |
402 | } | |
403 | } | |
7abc66b1 | 404 | #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ |
0021b564 | 405 | |
b0dc7e4c | 406 | #if USE_TM_CLONE_REGISTRY |
7546aa9d | 407 | deregister_tm_clones (); |
b0dc7e4c RH |
408 | #endif /* USE_TM_CLONE_REGISTRY */ |
409 | ||
275b60d6 | 410 | #ifdef USE_EH_FRAME_REGISTRY |
f691dc3b | 411 | #ifdef CRT_GET_RFIB_DATA |
101fa48c RH |
412 | /* If we used the new __register_frame_info_bases interface, |
413 | make sure that we deregister from the same place. */ | |
414 | if (__deregister_frame_info_bases) | |
415 | __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
416 | #else | |
8f08ea1e L |
417 | if (__deregister_frame_info) |
418 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
0021b564 | 419 | #endif |
101fa48c RH |
420 | #endif |
421 | ||
5041a61c | 422 | completed = 1; |
68d69835 JM |
423 | } |
424 | ||
425 | /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
7abc66b1 | 426 | #ifdef FINI_SECTION_ASM_OP |
cea3bd3e | 427 | CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) |
6d83cb32 | 428 | #elif defined (FINI_ARRAY_SECTION_ASM_OP) |
7abc66b1 | 429 | static func_ptr __do_global_dtors_aux_fini_array_entry[] |
806fc6aa | 430 | __attribute__ ((__used__, section(".fini_array"), aligned(sizeof(func_ptr)))) |
7abc66b1 | 431 | = { __do_global_dtors_aux }; |
6d83cb32 DR |
432 | #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */ |
433 | static void __attribute__((used)) | |
434 | __do_global_dtors_aux_1 (void) | |
435 | { | |
436 | atexit (__do_global_dtors_aux); | |
437 | } | |
53d68b9f JM |
438 | CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, |
439 | __do_global_dtors_aux_1) | |
6d83cb32 | 440 | #endif |
68d69835 | 441 | |
b0dc7e4c | 442 | #if defined(USE_EH_FRAME_REGISTRY) \ |
b0dc7e4c | 443 | || defined(USE_TM_CLONE_REGISTRY) |
6d8ccdbb JL |
444 | /* Stick a call to __register_frame_info into the .init section. For some |
445 | reason calls with no arguments work more reliably in .init, so stick the | |
446 | call in another function. */ | |
0021b564 | 447 | |
cea3bd3e | 448 | static void __attribute__((used)) |
3cc22c31 | 449 | frame_dummy (void) |
0021b564 | 450 | { |
275b60d6 | 451 | #ifdef USE_EH_FRAME_REGISTRY |
956d6950 | 452 | static struct object object; |
f691dc3b | 453 | #ifdef CRT_GET_RFIB_DATA |
1066e2b5 | 454 | void *tbase, *dbase; |
1066e2b5 | 455 | tbase = 0; |
1066e2b5 | 456 | CRT_GET_RFIB_DATA (dbase); |
1066e2b5 RH |
457 | if (__register_frame_info_bases) |
458 | __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
459 | #else | |
8f08ea1e L |
460 | if (__register_frame_info) |
461 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
f691dc3b | 462 | #endif /* CRT_GET_RFIB_DATA */ |
4505024e | 463 | #endif /* USE_EH_FRAME_REGISTRY */ |
b0dc7e4c | 464 | |
b0dc7e4c | 465 | #if USE_TM_CLONE_REGISTRY |
7546aa9d | 466 | register_tm_clones (); |
b0dc7e4c | 467 | #endif /* USE_TM_CLONE_REGISTRY */ |
0021b564 JM |
468 | } |
469 | ||
53d68b9f JM |
470 | #ifdef __LIBGCC_INIT_SECTION_ASM_OP__ |
471 | CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, frame_dummy) | |
472 | #else /* defined(__LIBGCC_INIT_SECTION_ASM_OP__) */ | |
7abc66b1 | 473 | static func_ptr __frame_dummy_init_array_entry[] |
806fc6aa | 474 | __attribute__ ((__used__, section(".init_array"), aligned(sizeof(func_ptr)))) |
7abc66b1 | 475 | = { frame_dummy }; |
53d68b9f | 476 | #endif /* !defined(__LIBGCC_INIT_SECTION_ASM_OP__) */ |
5a79befb | 477 | #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */ |
0021b564 | 478 | |
68d69835 JM |
479 | #else /* OBJECT_FORMAT_ELF */ |
480 | ||
b335c2cc | 481 | /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o |
b71a4aa9 | 482 | and once in crtend.o). It must be declared static to avoid a link |
b335c2cc TW |
483 | error. Here, we define __do_global_ctors as an externally callable |
484 | function. It is externally callable so that __main can invoke it when | |
485 | INVOKE__main is defined. This has the additional effect of forcing cc1 | |
486 | to switch to the .text section. */ | |
0f41302f | 487 | |
d1e51320 | 488 | static void __do_global_ctors_aux (void); |
3cc22c31 JL |
489 | void |
490 | __do_global_ctors (void) | |
329d2160 | 491 | { |
29d2c7a5 RH |
492 | #ifdef INVOKE__main |
493 | /* If __main won't actually call __do_global_ctors then it doesn't matter | |
494 | what's inside the function. The inside of __do_global_ctors_aux is | |
495 | called automatically in that case. And the Alliant fx2800 linker | |
496 | crashes on this reference. So prevent the crash. */ | |
329d2160 RS |
497 | __do_global_ctors_aux (); |
498 | #endif | |
499 | } | |
dc17e9e9 | 500 | |
53d68b9f | 501 | asm (__LIBGCC_INIT_SECTION_ASM_OP__); /* cc1 doesn't know that we are switching! */ |
dc17e9e9 RS |
502 | |
503 | /* A routine to invoke all of the global constructors upon entry to the | |
504 | program. We put this into the .init section (for systems that have | |
505 | such a thing) so that we can properly perform the construction of | |
6d2f8887 | 506 | file-scope static-storage C++ objects within shared libraries. */ |
dc17e9e9 | 507 | |
cea3bd3e | 508 | static void __attribute__((used)) |
3cc22c31 | 509 | __do_global_ctors_aux (void) /* prologue goes in .init section */ |
dc17e9e9 | 510 | { |
cea3bd3e | 511 | FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ |
53d68b9f | 512 | asm (__LIBGCC_TEXT_SECTION_ASM_OP__); /* don't put epilogue and body in .init */ |
dc17e9e9 | 513 | DO_GLOBAL_CTORS_BODY; |
451fbdf2 | 514 | atexit (__do_global_dtors); |
dc17e9e9 RS |
515 | } |
516 | ||
68d69835 | 517 | #endif /* OBJECT_FORMAT_ELF */ |
fe1fd353 | 518 | |
53d68b9f | 519 | #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */ |
fe1fd353 | 520 | |
af8e5a0e RO |
521 | extern void __do_global_dtors (void); |
522 | ||
fe1fd353 JM |
523 | /* This case is used by the Irix 6 port, which supports named sections but |
524 | not an SVR4-style .fini section. __do_global_dtors can be non-static | |
0021b564 JM |
525 | in this case because we protect it with -hidden_symbol. */ |
526 | ||
fe1fd353 | 527 | void |
3cc22c31 | 528 | __do_global_dtors (void) |
fe1fd353 | 529 | { |
1066e2b5 RH |
530 | func_ptr *p, f; |
531 | for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
532 | f (); | |
0021b564 | 533 | |
b0dc7e4c | 534 | #if USE_TM_CLONE_REGISTRY |
7546aa9d | 535 | deregister_tm_clones (); |
b0dc7e4c RH |
536 | #endif /* USE_TM_CLONE_REGISTRY */ |
537 | ||
275b60d6 | 538 | #ifdef USE_EH_FRAME_REGISTRY |
8f08ea1e L |
539 | if (__deregister_frame_info) |
540 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
0021b564 | 541 | #endif |
fe1fd353 | 542 | } |
35a42f5f | 543 | |
b0dc7e4c | 544 | #if defined(USE_EH_FRAME_REGISTRY) \ |
b0dc7e4c | 545 | || defined(USE_TM_CLONE_REGISTRY) |
29d2c7a5 RH |
546 | /* A helper function for __do_global_ctors, which is in crtend.o. Here |
547 | in crtbegin.o, we can reference a couple of symbols not visible there. | |
548 | Plus, since we're before libgcc.a, we have no problems referencing | |
549 | functions from there. */ | |
35a42f5f | 550 | void |
29d2c7a5 | 551 | __do_global_ctors_1(void) |
35a42f5f | 552 | { |
275b60d6 | 553 | #ifdef USE_EH_FRAME_REGISTRY |
35a42f5f | 554 | static struct object object; |
8f08ea1e L |
555 | if (__register_frame_info) |
556 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
b335c2cc | 557 | #endif |
b0dc7e4c | 558 | |
b0dc7e4c | 559 | #if USE_TM_CLONE_REGISTRY |
7546aa9d | 560 | register_tm_clones (); |
b0dc7e4c | 561 | #endif /* USE_TM_CLONE_REGISTRY */ |
213f974a | 562 | } |
5a79befb | 563 | #endif /* USE_EH_FRAME_REGISTRY || USE_TM_CLONE_REGISTRY */ |
6351543d | 564 | |
53d68b9f | 565 | #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */ |
29d2c7a5 RH |
566 | #error "What are you doing with crtstuff.c, then?" |
567 | #endif | |
568 | ||
569 | #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
570 | ||
9ce7ad7f L |
571 | /* No need for .ctors/.dtors section if linker can place them in |
572 | .init_array/.fini_array section. */ | |
573 | #ifndef USE_INITFINI_ARRAY | |
29d2c7a5 RH |
574 | /* Put a word containing zero at the end of each of our two lists of function |
575 | addresses. Note that the words defined here go into the .ctors and .dtors | |
576 | sections of the crtend.o file, and since that file is always linked in | |
577 | last, these words naturally end up at the very ends of the two lists | |
578 | contained in these two sections. */ | |
579 | ||
580 | #ifdef CTOR_LIST_END | |
581 | CTOR_LIST_END; | |
53d68b9f | 582 | #elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__) |
29d2c7a5 RH |
583 | /* Hack: force cc1 to switch to .data section early, so that assembling |
584 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
e4fa83d3 | 585 | static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
53d68b9f | 586 | asm (__LIBGCC_CTORS_SECTION_ASM_OP__); |
29d2c7a5 RH |
587 | STATIC func_ptr __CTOR_END__[1] |
588 | __attribute__((aligned(sizeof(func_ptr)))) | |
589 | = { (func_ptr) 0 }; | |
590 | #else | |
591 | STATIC func_ptr __CTOR_END__[1] | |
592 | __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
593 | = { (func_ptr) 0 }; | |
594 | #endif | |
595 | ||
596 | #ifdef DTOR_LIST_END | |
597 | DTOR_LIST_END; | |
3fc95619 | 598 | #elif defined(HIDDEN_DTOR_LIST_END) |
53d68b9f JM |
599 | #ifdef __LIBGCC_DTORS_SECTION_ASM_OP__ |
600 | asm (__LIBGCC_DTORS_SECTION_ASM_OP__); | |
3fc95619 UD |
601 | #endif |
602 | func_ptr __DTOR_END__[1] | |
b8053194 | 603 | __attribute__ ((used, |
53d68b9f | 604 | #ifndef __LIBGCC_DTORS_SECTION_ASM_OP__ |
3fc95619 UD |
605 | section(".dtors"), |
606 | #endif | |
607 | aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
608 | = { (func_ptr) 0 }; | |
53d68b9f JM |
609 | #elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__) |
610 | asm (__LIBGCC_DTORS_SECTION_ASM_OP__); | |
29d2c7a5 | 611 | STATIC func_ptr __DTOR_END__[1] |
b8053194 | 612 | __attribute__ ((used, aligned(sizeof(func_ptr)))) |
29d2c7a5 RH |
613 | = { (func_ptr) 0 }; |
614 | #else | |
615 | STATIC func_ptr __DTOR_END__[1] | |
b8053194 | 616 | __attribute__((used, section(".dtors"), aligned(sizeof(func_ptr)))) |
29d2c7a5 RH |
617 | = { (func_ptr) 0 }; |
618 | #endif | |
9ce7ad7f | 619 | #endif /* USE_INITFINI_ARRAY */ |
dc17e9e9 | 620 | |
53d68b9f | 621 | #ifdef __LIBGCC_EH_FRAME_SECTION_NAME__ |
29d2c7a5 RH |
622 | /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; |
623 | this would be the 'length' field in a real FDE. */ | |
61f03aba RH |
624 | # if __INT_MAX__ == 2147483647 |
625 | typedef int int32; | |
626 | # elif __LONG_MAX__ == 2147483647 | |
627 | typedef long int32; | |
628 | # elif __SHRT_MAX__ == 2147483647 | |
629 | typedef short int32; | |
630 | # else | |
631 | # error "Missing a 4 byte integer" | |
632 | # endif | |
633 | STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
53d68b9f | 634 | __attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__), |
61f03aba | 635 | aligned(sizeof(int32)))) |
29d2c7a5 | 636 | = { 0 }; |
53d68b9f | 637 | #endif /* __LIBGCC_EH_FRAME_SECTION_NAME__ */ |
29d2c7a5 | 638 | |
b0dc7e4c | 639 | #if USE_TM_CLONE_REGISTRY |
7546aa9d RH |
640 | # ifndef HAVE_GAS_HIDDEN |
641 | static | |
642 | # endif | |
b0dc7e4c | 643 | func_ptr __TMC_END__[] |
7546aa9d RH |
644 | __attribute__((used, section(".tm_clone_table"), aligned(sizeof(void *)))) |
645 | # ifdef HAVE_GAS_HIDDEN | |
646 | __attribute__((__visibility__ ("hidden"))) = { }; | |
647 | # else | |
648 | = { 0, 0 }; | |
649 | # endif | |
b0dc7e4c RH |
650 | #endif /* USE_TM_CLONE_REGISTRY */ |
651 | ||
53d68b9f | 652 | #ifdef __LIBGCC_INIT_ARRAY_SECTION_ASM_OP__ |
7abc66b1 JB |
653 | |
654 | /* If we are using .init_array, there is nothing to do. */ | |
655 | ||
53d68b9f | 656 | #elif defined(__LIBGCC_INIT_SECTION_ASM_OP__) |
dc17e9e9 | 657 | |
68d69835 | 658 | #ifdef OBJECT_FORMAT_ELF |
cea3bd3e | 659 | static void __attribute__((used)) |
3cc22c31 | 660 | __do_global_ctors_aux (void) |
68d69835 JM |
661 | { |
662 | func_ptr *p; | |
663 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
664 | (*p) (); | |
665 | } | |
666 | ||
667 | /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
53d68b9f | 668 | CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, __do_global_ctors_aux) |
68d69835 JM |
669 | #else /* OBJECT_FORMAT_ELF */ |
670 | ||
671 | /* Stick the real initialization code, followed by a normal sort of | |
672 | function epilogue at the very end of the .init section for this | |
673 | entire root executable file or for this entire shared library file. | |
674 | ||
675 | Note that we use some tricks here to get *just* the body and just | |
676 | a function epilogue (but no function prologue) into the .init | |
9faa82d8 | 677 | section of the crtend.o file. Specifically, we switch to the .text |
68d69835 JM |
678 | section, start to define a function, and then we switch to the .init |
679 | section just before the body code. | |
680 | ||
681 | Earlier on, we put the corresponding function prologue into the .init | |
682 | section of the crtbegin.o file (which will be linked in first). | |
683 | ||
684 | Note that we want to invoke all constructors for C++ file-scope static- | |
685 | storage objects AFTER any other possible initialization actions which | |
686 | may be performed by the code in the .init section contributions made by | |
687 | other libraries, etc. That's because those other initializations may | |
688 | include setup operations for very primitive things (e.g. initializing | |
689 | the state of the floating-point coprocessor, etc.) which should be done | |
0f41302f | 690 | before we start to execute any of the user's code. */ |
dc17e9e9 RS |
691 | |
692 | static void | |
3cc22c31 | 693 | __do_global_ctors_aux (void) /* prologue goes in .text section */ |
dc17e9e9 | 694 | { |
53d68b9f | 695 | asm (__LIBGCC_INIT_SECTION_ASM_OP__); |
dc17e9e9 | 696 | DO_GLOBAL_CTORS_BODY; |
451fbdf2 | 697 | atexit (__do_global_dtors); |
e5e809f4 JL |
698 | } /* epilogue and body go in .init section */ |
699 | ||
cea3bd3e | 700 | FORCE_CODE_SECTION_ALIGN |
53d68b9f | 701 | asm (__LIBGCC_TEXT_SECTION_ASM_OP__); |
dc17e9e9 | 702 | |
68d69835 JM |
703 | #endif /* OBJECT_FORMAT_ELF */ |
704 | ||
53d68b9f | 705 | #elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */ |
fe1fd353 | 706 | |
af8e5a0e RO |
707 | extern void __do_global_ctors (void); |
708 | ||
fe1fd353 JM |
709 | /* This case is used by the Irix 6 port, which supports named sections but |
710 | not an SVR4-style .init section. __do_global_ctors can be non-static | |
0021b564 | 711 | in this case because we protect it with -hidden_symbol. */ |
fe1fd353 | 712 | void |
3cc22c31 | 713 | __do_global_ctors (void) |
fe1fd353 JM |
714 | { |
715 | func_ptr *p; | |
b0dc7e4c | 716 | #if defined(USE_EH_FRAME_REGISTRY) \ |
b0dc7e4c | 717 | || defined(USE_TM_CLONE_REGISTRY) |
29d2c7a5 | 718 | __do_global_ctors_1(); |
0021b564 | 719 | #endif |
fe1fd353 JM |
720 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
721 | (*p) (); | |
722 | } | |
68d69835 | 723 | |
53d68b9f | 724 | #else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */ |
29d2c7a5 | 725 | #error "What are you doing with crtstuff.c, then?" |
b335c2cc | 726 | #endif |
dc17e9e9 | 727 | |
29d2c7a5 RH |
728 | #else /* ! CRT_BEGIN && ! CRT_END */ |
729 | #error "One of CRT_BEGIN or CRT_END must be defined." | |
b335c2cc | 730 | #endif |