Mercurial > hg > CbC > CbC_gcc
comparison gcc/crtstuff.c @ 0:a06113de4d67
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author | kent <kent@cr.ie.u-ryukyu.ac.jp> |
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date | Fri, 17 Jul 2009 14:47:48 +0900 |
parents | |
children | 77e2b8dfacca |
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1 /* Specialized bits of code needed to support construction and | |
2 destruction of file-scope objects in C++ code. | |
3 Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, | |
4 2002, 2003, 2004, 2005, 2009 Free Software Foundation, Inc. | |
5 Contributed by Ron Guilmette (rfg@monkeys.com). | |
6 | |
7 This file is part of GCC. | |
8 | |
9 GCC is free software; you can redistribute it and/or modify it under | |
10 the terms of the GNU General Public License as published by the Free | |
11 Software Foundation; either version 3, or (at your option) any later | |
12 version. | |
13 | |
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
17 for more details. | |
18 | |
19 Under Section 7 of GPL version 3, you are granted additional | |
20 permissions described in the GCC Runtime Library Exception, version | |
21 3.1, as published by the Free Software Foundation. | |
22 | |
23 You should have received a copy of the GNU General Public License and | |
24 a copy of the GCC Runtime Library Exception along with this program; | |
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
26 <http://www.gnu.org/licenses/>. */ | |
27 | |
28 /* This file is a bit like libgcc2.c in that it is compiled | |
29 multiple times and yields multiple .o files. | |
30 | |
31 This file is useful on target machines where the object file format | |
32 supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On | |
33 such systems, this file allows us to avoid running collect (or any | |
34 other such slow and painful kludge). Additionally, if the target | |
35 system supports a .init section, this file allows us to support the | |
36 linking of C++ code with a non-C++ main program. | |
37 | |
38 Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then | |
39 this file *will* make use of the .init section. If that symbol is | |
40 not defined however, then the .init section will not be used. | |
41 | |
42 Currently, only ELF and COFF are supported. It is likely however that | |
43 ROSE could also be supported, if someone was willing to do the work to | |
44 make whatever (small?) adaptations are needed. (Some work may be | |
45 needed on the ROSE assembler and linker also.) | |
46 | |
47 This file must be compiled with gcc. */ | |
48 | |
49 /* Target machine header files require this define. */ | |
50 #define IN_LIBGCC2 | |
51 | |
52 /* FIXME: Including auto-host is incorrect, but until we have | |
53 identified the set of defines that need to go into auto-target.h, | |
54 this will have to do. */ | |
55 #include "auto-host.h" | |
56 #undef gid_t | |
57 #undef pid_t | |
58 #undef rlim_t | |
59 #undef ssize_t | |
60 #undef uid_t | |
61 #undef vfork | |
62 #include "tconfig.h" | |
63 #include "tsystem.h" | |
64 #include "coretypes.h" | |
65 #include "tm.h" | |
66 #include "unwind-dw2-fde.h" | |
67 | |
68 #ifndef FORCE_CODE_SECTION_ALIGN | |
69 # define FORCE_CODE_SECTION_ALIGN | |
70 #endif | |
71 | |
72 #ifndef CRT_CALL_STATIC_FUNCTION | |
73 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ | |
74 static void __attribute__((__used__)) \ | |
75 call_ ## FUNC (void) \ | |
76 { \ | |
77 asm (SECTION_OP); \ | |
78 FUNC (); \ | |
79 FORCE_CODE_SECTION_ALIGN \ | |
80 asm (TEXT_SECTION_ASM_OP); \ | |
81 } | |
82 #endif | |
83 | |
84 #if defined(OBJECT_FORMAT_ELF) \ | |
85 && !defined(OBJECT_FORMAT_FLAT) \ | |
86 && defined(HAVE_LD_EH_FRAME_HDR) \ | |
87 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ | |
88 && defined(__GLIBC__) && __GLIBC__ >= 2 | |
89 #include <link.h> | |
90 /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h. | |
91 But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */ | |
92 # if !defined(__UCLIBC__) \ | |
93 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ | |
94 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) | |
95 # define USE_PT_GNU_EH_FRAME | |
96 # endif | |
97 #endif | |
98 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME) | |
99 # define USE_EH_FRAME_REGISTRY | |
100 #endif | |
101 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY | |
102 # define EH_FRAME_SECTION_CONST const | |
103 #else | |
104 # define EH_FRAME_SECTION_CONST | |
105 #endif | |
106 | |
107 #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \ | |
108 && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP) | |
109 # define HIDDEN_DTOR_LIST_END | |
110 #endif | |
111 | |
112 /* We do not want to add the weak attribute to the declarations of these | |
113 routines in unwind-dw2-fde.h because that will cause the definition of | |
114 these symbols to be weak as well. | |
115 | |
116 This exposes a core issue, how to handle creating weak references vs | |
117 how to create weak definitions. Either we have to have the definition | |
118 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or | |
119 have a second declaration if we want a function's references to be weak, | |
120 but not its definition. | |
121 | |
122 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until | |
123 one thinks about scaling to larger problems -- i.e., the condition under | |
124 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too | |
125 complicated. | |
126 | |
127 So, we take an approach similar to #pragma weak -- we have a second | |
128 declaration for functions that we want to have weak references. | |
129 | |
130 Neither way is particularly good. */ | |
131 | |
132 /* References to __register_frame_info and __deregister_frame_info should | |
133 be weak in this file if at all possible. */ | |
134 extern void __register_frame_info (const void *, struct object *) | |
135 TARGET_ATTRIBUTE_WEAK; | |
136 extern void __register_frame_info_bases (const void *, struct object *, | |
137 void *, void *) | |
138 TARGET_ATTRIBUTE_WEAK; | |
139 extern void *__deregister_frame_info (const void *) | |
140 TARGET_ATTRIBUTE_WEAK; | |
141 extern void *__deregister_frame_info_bases (const void *) | |
142 TARGET_ATTRIBUTE_WEAK; | |
143 extern void __do_global_ctors_1 (void); | |
144 | |
145 /* Likewise for _Jv_RegisterClasses. */ | |
146 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
147 | |
148 #ifdef OBJECT_FORMAT_ELF | |
149 | |
150 /* Declare a pointer to void function type. */ | |
151 typedef void (*func_ptr) (void); | |
152 #define STATIC static | |
153 | |
154 #else /* OBJECT_FORMAT_ELF */ | |
155 | |
156 #include "gbl-ctors.h" | |
157 | |
158 #define STATIC | |
159 | |
160 #endif /* OBJECT_FORMAT_ELF */ | |
161 | |
162 #ifdef CRT_BEGIN | |
163 | |
164 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange | |
165 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
166 __DTOR_END__ } per root executable and also one set of these symbols | |
167 per shared library. So in any given whole process image, we may have | |
168 multiple definitions of each of these symbols. In order to prevent | |
169 these definitions from conflicting with one another, and in order to | |
170 ensure that the proper lists are used for the initialization/finalization | |
171 of each individual shared library (respectively), we give these symbols | |
172 only internal (i.e. `static') linkage, and we also make it a point to | |
173 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
174 symbol in crtbegin.o, where they are defined. */ | |
175 | |
176 /* The -1 is a flag to __do_global_[cd]tors indicating that this table | |
177 does not start with a count of elements. */ | |
178 #ifdef CTOR_LIST_BEGIN | |
179 CTOR_LIST_BEGIN; | |
180 #elif defined(CTORS_SECTION_ASM_OP) | |
181 /* Hack: force cc1 to switch to .data section early, so that assembling | |
182 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
183 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
184 asm (CTORS_SECTION_ASM_OP); | |
185 STATIC func_ptr __CTOR_LIST__[1] | |
186 __attribute__ ((__unused__, aligned(sizeof(func_ptr)))) | |
187 = { (func_ptr) (-1) }; | |
188 #else | |
189 STATIC func_ptr __CTOR_LIST__[1] | |
190 __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr)))) | |
191 = { (func_ptr) (-1) }; | |
192 #endif /* __CTOR_LIST__ alternatives */ | |
193 | |
194 #ifdef DTOR_LIST_BEGIN | |
195 DTOR_LIST_BEGIN; | |
196 #elif defined(DTORS_SECTION_ASM_OP) | |
197 asm (DTORS_SECTION_ASM_OP); | |
198 STATIC func_ptr __DTOR_LIST__[1] | |
199 __attribute__ ((aligned(sizeof(func_ptr)))) | |
200 = { (func_ptr) (-1) }; | |
201 #else | |
202 STATIC func_ptr __DTOR_LIST__[1] | |
203 __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
204 = { (func_ptr) (-1) }; | |
205 #endif /* __DTOR_LIST__ alternatives */ | |
206 | |
207 #ifdef USE_EH_FRAME_REGISTRY | |
208 /* Stick a label at the beginning of the frame unwind info so we can register | |
209 and deregister it with the exception handling library code. */ | |
210 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] | |
211 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4))) | |
212 = { }; | |
213 #endif /* USE_EH_FRAME_REGISTRY */ | |
214 | |
215 #ifdef JCR_SECTION_NAME | |
216 /* Stick a label at the beginning of the java class registration info | |
217 so we can register them properly. */ | |
218 STATIC void *__JCR_LIST__[] | |
219 __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*)))) | |
220 = { }; | |
221 #endif /* JCR_SECTION_NAME */ | |
222 | |
223 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP) | |
224 | |
225 #ifdef OBJECT_FORMAT_ELF | |
226 | |
227 /* Declare the __dso_handle variable. It should have a unique value | |
228 in every shared-object; in a main program its value is zero. The | |
229 object should in any case be protected. This means the instance | |
230 in one DSO or the main program is not used in another object. The | |
231 dynamic linker takes care of this. */ | |
232 | |
233 #ifdef TARGET_LIBGCC_SDATA_SECTION | |
234 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
235 #endif | |
236 #ifdef HAVE_GAS_HIDDEN | |
237 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); | |
238 #endif | |
239 #ifdef CRTSTUFFS_O | |
240 void *__dso_handle = &__dso_handle; | |
241 #else | |
242 void *__dso_handle = 0; | |
243 #endif | |
244 | |
245 /* The __cxa_finalize function may not be available so we use only a | |
246 weak declaration. */ | |
247 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
248 | |
249 /* Run all the global destructors on exit from the program. */ | |
250 | |
251 /* Some systems place the number of pointers in the first word of the | |
252 table. On SVR4 however, that word is -1. In all cases, the table is | |
253 null-terminated. On SVR4, we start from the beginning of the list and | |
254 invoke each per-compilation-unit destructor routine in order | |
255 until we find that null. | |
256 | |
257 Note that this function MUST be static. There will be one of these | |
258 functions in each root executable and one in each shared library, but | |
259 although they all have the same code, each one is unique in that it | |
260 refers to one particular associated `__DTOR_LIST__' which belongs to the | |
261 same particular root executable or shared library file. | |
262 | |
263 On some systems, this routine is run more than once from the .fini, | |
264 when exit is called recursively, so we arrange to remember where in | |
265 the list we left off processing, and we resume at that point, | |
266 should we be re-invoked. */ | |
267 | |
268 static void __attribute__((used)) | |
269 __do_global_dtors_aux (void) | |
270 { | |
271 static _Bool completed; | |
272 | |
273 if (__builtin_expect (completed, 0)) | |
274 return; | |
275 | |
276 #ifdef CRTSTUFFS_O | |
277 if (__cxa_finalize) | |
278 __cxa_finalize (__dso_handle); | |
279 #endif | |
280 | |
281 #ifdef FINI_ARRAY_SECTION_ASM_OP | |
282 /* If we are using .fini_array then destructors will be run via that | |
283 mechanism. */ | |
284 #elif defined(HIDDEN_DTOR_LIST_END) | |
285 { | |
286 /* Safer version that makes sure only .dtors function pointers are | |
287 called even if the static variable is maliciously changed. */ | |
288 extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); | |
289 static size_t dtor_idx; | |
290 const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; | |
291 func_ptr f; | |
292 | |
293 while (dtor_idx < max_idx) | |
294 { | |
295 f = __DTOR_LIST__[++dtor_idx]; | |
296 f (); | |
297 } | |
298 } | |
299 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ | |
300 { | |
301 static func_ptr *p = __DTOR_LIST__ + 1; | |
302 func_ptr f; | |
303 | |
304 while ((f = *p)) | |
305 { | |
306 p++; | |
307 f (); | |
308 } | |
309 } | |
310 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ | |
311 | |
312 #ifdef USE_EH_FRAME_REGISTRY | |
313 #ifdef CRT_GET_RFIB_DATA | |
314 /* If we used the new __register_frame_info_bases interface, | |
315 make sure that we deregister from the same place. */ | |
316 if (__deregister_frame_info_bases) | |
317 __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
318 #else | |
319 if (__deregister_frame_info) | |
320 __deregister_frame_info (__EH_FRAME_BEGIN__); | |
321 #endif | |
322 #endif | |
323 | |
324 completed = 1; | |
325 } | |
326 | |
327 /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
328 #ifdef FINI_SECTION_ASM_OP | |
329 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) | |
330 #else /* !defined(FINI_SECTION_ASM_OP) */ | |
331 static func_ptr __do_global_dtors_aux_fini_array_entry[] | |
332 __attribute__ ((__unused__, section(".fini_array"))) | |
333 = { __do_global_dtors_aux }; | |
334 #endif /* !defined(FINI_SECTION_ASM_OP) */ | |
335 | |
336 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
337 /* Stick a call to __register_frame_info into the .init section. For some | |
338 reason calls with no arguments work more reliably in .init, so stick the | |
339 call in another function. */ | |
340 | |
341 static void __attribute__((used)) | |
342 frame_dummy (void) | |
343 { | |
344 #ifdef USE_EH_FRAME_REGISTRY | |
345 static struct object object; | |
346 #ifdef CRT_GET_RFIB_DATA | |
347 void *tbase, *dbase; | |
348 tbase = 0; | |
349 CRT_GET_RFIB_DATA (dbase); | |
350 if (__register_frame_info_bases) | |
351 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
352 #else | |
353 if (__register_frame_info) | |
354 __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
355 #endif /* CRT_GET_RFIB_DATA */ | |
356 #endif /* USE_EH_FRAME_REGISTRY */ | |
357 #ifdef JCR_SECTION_NAME | |
358 if (__JCR_LIST__[0]) | |
359 { | |
360 void (*register_classes) (void *) = _Jv_RegisterClasses; | |
361 __asm ("" : "+r" (register_classes)); | |
362 if (register_classes) | |
363 register_classes (__JCR_LIST__); | |
364 } | |
365 #endif /* JCR_SECTION_NAME */ | |
366 } | |
367 | |
368 #ifdef INIT_SECTION_ASM_OP | |
369 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy) | |
370 #else /* defined(INIT_SECTION_ASM_OP) */ | |
371 static func_ptr __frame_dummy_init_array_entry[] | |
372 __attribute__ ((__unused__, section(".init_array"))) | |
373 = { frame_dummy }; | |
374 #endif /* !defined(INIT_SECTION_ASM_OP) */ | |
375 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ | |
376 | |
377 #else /* OBJECT_FORMAT_ELF */ | |
378 | |
379 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o | |
380 and once in crtend.o). It must be declared static to avoid a link | |
381 error. Here, we define __do_global_ctors as an externally callable | |
382 function. It is externally callable so that __main can invoke it when | |
383 INVOKE__main is defined. This has the additional effect of forcing cc1 | |
384 to switch to the .text section. */ | |
385 | |
386 static void __do_global_ctors_aux (void); | |
387 void | |
388 __do_global_ctors (void) | |
389 { | |
390 #ifdef INVOKE__main | |
391 /* If __main won't actually call __do_global_ctors then it doesn't matter | |
392 what's inside the function. The inside of __do_global_ctors_aux is | |
393 called automatically in that case. And the Alliant fx2800 linker | |
394 crashes on this reference. So prevent the crash. */ | |
395 __do_global_ctors_aux (); | |
396 #endif | |
397 } | |
398 | |
399 asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ | |
400 | |
401 /* A routine to invoke all of the global constructors upon entry to the | |
402 program. We put this into the .init section (for systems that have | |
403 such a thing) so that we can properly perform the construction of | |
404 file-scope static-storage C++ objects within shared libraries. */ | |
405 | |
406 static void __attribute__((used)) | |
407 __do_global_ctors_aux (void) /* prologue goes in .init section */ | |
408 { | |
409 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ | |
410 asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ | |
411 DO_GLOBAL_CTORS_BODY; | |
412 atexit (__do_global_dtors); | |
413 } | |
414 | |
415 #endif /* OBJECT_FORMAT_ELF */ | |
416 | |
417 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ | |
418 | |
419 extern void __do_global_dtors (void); | |
420 | |
421 /* This case is used by the Irix 6 port, which supports named sections but | |
422 not an SVR4-style .fini section. __do_global_dtors can be non-static | |
423 in this case because we protect it with -hidden_symbol. */ | |
424 | |
425 void | |
426 __do_global_dtors (void) | |
427 { | |
428 func_ptr *p, f; | |
429 for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
430 f (); | |
431 | |
432 #ifdef USE_EH_FRAME_REGISTRY | |
433 if (__deregister_frame_info) | |
434 __deregister_frame_info (__EH_FRAME_BEGIN__); | |
435 #endif | |
436 } | |
437 | |
438 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
439 /* A helper function for __do_global_ctors, which is in crtend.o. Here | |
440 in crtbegin.o, we can reference a couple of symbols not visible there. | |
441 Plus, since we're before libgcc.a, we have no problems referencing | |
442 functions from there. */ | |
443 void | |
444 __do_global_ctors_1(void) | |
445 { | |
446 #ifdef USE_EH_FRAME_REGISTRY | |
447 static struct object object; | |
448 if (__register_frame_info) | |
449 __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
450 #endif | |
451 #ifdef JCR_SECTION_NAME | |
452 if (__JCR_LIST__[0]) | |
453 { | |
454 void (*register_classes) (void *) = _Jv_RegisterClasses; | |
455 __asm ("" : "+r" (register_classes)); | |
456 if (register_classes) | |
457 register_classes (__JCR_LIST__); | |
458 } | |
459 #endif | |
460 } | |
461 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ | |
462 | |
463 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ | |
464 #error "What are you doing with crtstuff.c, then?" | |
465 #endif | |
466 | |
467 #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
468 | |
469 /* Put a word containing zero at the end of each of our two lists of function | |
470 addresses. Note that the words defined here go into the .ctors and .dtors | |
471 sections of the crtend.o file, and since that file is always linked in | |
472 last, these words naturally end up at the very ends of the two lists | |
473 contained in these two sections. */ | |
474 | |
475 #ifdef CTOR_LIST_END | |
476 CTOR_LIST_END; | |
477 #elif defined(CTORS_SECTION_ASM_OP) | |
478 /* Hack: force cc1 to switch to .data section early, so that assembling | |
479 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
480 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
481 asm (CTORS_SECTION_ASM_OP); | |
482 STATIC func_ptr __CTOR_END__[1] | |
483 __attribute__((aligned(sizeof(func_ptr)))) | |
484 = { (func_ptr) 0 }; | |
485 #else | |
486 STATIC func_ptr __CTOR_END__[1] | |
487 __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
488 = { (func_ptr) 0 }; | |
489 #endif | |
490 | |
491 #ifdef DTOR_LIST_END | |
492 DTOR_LIST_END; | |
493 #elif defined(HIDDEN_DTOR_LIST_END) | |
494 #ifdef DTORS_SECTION_ASM_OP | |
495 asm (DTORS_SECTION_ASM_OP); | |
496 #endif | |
497 func_ptr __DTOR_END__[1] | |
498 __attribute__ ((unused, | |
499 #ifndef DTORS_SECTION_ASM_OP | |
500 section(".dtors"), | |
501 #endif | |
502 aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
503 = { (func_ptr) 0 }; | |
504 #elif defined(DTORS_SECTION_ASM_OP) | |
505 asm (DTORS_SECTION_ASM_OP); | |
506 STATIC func_ptr __DTOR_END__[1] | |
507 __attribute__ ((unused, aligned(sizeof(func_ptr)))) | |
508 = { (func_ptr) 0 }; | |
509 #else | |
510 STATIC func_ptr __DTOR_END__[1] | |
511 __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr)))) | |
512 = { (func_ptr) 0 }; | |
513 #endif | |
514 | |
515 #ifdef EH_FRAME_SECTION_NAME | |
516 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; | |
517 this would be the 'length' field in a real FDE. */ | |
518 # if __INT_MAX__ == 2147483647 | |
519 typedef int int32; | |
520 # elif __LONG_MAX__ == 2147483647 | |
521 typedef long int32; | |
522 # elif __SHRT_MAX__ == 2147483647 | |
523 typedef short int32; | |
524 # else | |
525 # error "Missing a 4 byte integer" | |
526 # endif | |
527 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
528 __attribute__ ((unused, section(EH_FRAME_SECTION_NAME), | |
529 aligned(sizeof(int32)))) | |
530 = { 0 }; | |
531 #endif /* EH_FRAME_SECTION_NAME */ | |
532 | |
533 #ifdef JCR_SECTION_NAME | |
534 /* Null terminate the .jcr section array. */ | |
535 STATIC void *__JCR_END__[1] | |
536 __attribute__ ((unused, section(JCR_SECTION_NAME), | |
537 aligned(sizeof(void *)))) | |
538 = { 0 }; | |
539 #endif /* JCR_SECTION_NAME */ | |
540 | |
541 #ifdef INIT_ARRAY_SECTION_ASM_OP | |
542 | |
543 /* If we are using .init_array, there is nothing to do. */ | |
544 | |
545 #elif defined(INIT_SECTION_ASM_OP) | |
546 | |
547 #ifdef OBJECT_FORMAT_ELF | |
548 static void __attribute__((used)) | |
549 __do_global_ctors_aux (void) | |
550 { | |
551 func_ptr *p; | |
552 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
553 (*p) (); | |
554 } | |
555 | |
556 /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
557 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux) | |
558 #else /* OBJECT_FORMAT_ELF */ | |
559 | |
560 /* Stick the real initialization code, followed by a normal sort of | |
561 function epilogue at the very end of the .init section for this | |
562 entire root executable file or for this entire shared library file. | |
563 | |
564 Note that we use some tricks here to get *just* the body and just | |
565 a function epilogue (but no function prologue) into the .init | |
566 section of the crtend.o file. Specifically, we switch to the .text | |
567 section, start to define a function, and then we switch to the .init | |
568 section just before the body code. | |
569 | |
570 Earlier on, we put the corresponding function prologue into the .init | |
571 section of the crtbegin.o file (which will be linked in first). | |
572 | |
573 Note that we want to invoke all constructors for C++ file-scope static- | |
574 storage objects AFTER any other possible initialization actions which | |
575 may be performed by the code in the .init section contributions made by | |
576 other libraries, etc. That's because those other initializations may | |
577 include setup operations for very primitive things (e.g. initializing | |
578 the state of the floating-point coprocessor, etc.) which should be done | |
579 before we start to execute any of the user's code. */ | |
580 | |
581 static void | |
582 __do_global_ctors_aux (void) /* prologue goes in .text section */ | |
583 { | |
584 asm (INIT_SECTION_ASM_OP); | |
585 DO_GLOBAL_CTORS_BODY; | |
586 atexit (__do_global_dtors); | |
587 } /* epilogue and body go in .init section */ | |
588 | |
589 FORCE_CODE_SECTION_ALIGN | |
590 asm (TEXT_SECTION_ASM_OP); | |
591 | |
592 #endif /* OBJECT_FORMAT_ELF */ | |
593 | |
594 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ | |
595 | |
596 extern void __do_global_ctors (void); | |
597 | |
598 /* This case is used by the Irix 6 port, which supports named sections but | |
599 not an SVR4-style .init section. __do_global_ctors can be non-static | |
600 in this case because we protect it with -hidden_symbol. */ | |
601 void | |
602 __do_global_ctors (void) | |
603 { | |
604 func_ptr *p; | |
605 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
606 __do_global_ctors_1(); | |
607 #endif | |
608 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
609 (*p) (); | |
610 } | |
611 | |
612 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ | |
613 #error "What are you doing with crtstuff.c, then?" | |
614 #endif | |
615 | |
616 #else /* ! CRT_BEGIN && ! CRT_END */ | |
617 #error "One of CRT_BEGIN or CRT_END must be defined." | |
618 #endif |