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Commit | Line | Data |
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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. | |
52c0e446 JM |
3 | Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
4 | 2002, 2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc. | |
d0f8fcea | 5 | Contributed by Ron Guilmette (rfg@monkeys.com). |
dc17e9e9 | 6 | |
1322177d | 7 | This file is part of GCC. |
dc17e9e9 | 8 | |
1322177d LB |
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 | |
748086b7 | 11 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 12 | version. |
dc17e9e9 | 13 | |
1322177d LB |
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. | |
dc17e9e9 | 18 | |
748086b7 JJ |
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/>. */ | |
dc17e9e9 | 27 | |
7857f134 | 28 | /* This file is a bit like libgcc2.c in that it is compiled |
dc17e9e9 RS |
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 | ||
37ce5b86 CH |
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.) | |
dc17e9e9 RS |
46 | |
47 | This file must be compiled with gcc. */ | |
48 | ||
56d6849d NS |
49 | /* Target machine header files require this define. */ |
50 | #define IN_LIBGCC2 | |
51 | ||
9d48ad93 NS |
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" | |
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" | |
52a11cbf | 64 | #include "unwind-dw2-fde.h" |
dc17e9e9 | 65 | |
cea3bd3e RH |
66 | #ifndef FORCE_CODE_SECTION_ALIGN |
67 | # define FORCE_CODE_SECTION_ALIGN | |
68 | #endif | |
69 | ||
036cfb36 | 70 | #ifndef CRT_CALL_STATIC_FUNCTION |
cea3bd3e RH |
71 | # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \ |
72 | static void __attribute__((__used__)) \ | |
73 | call_ ## FUNC (void) \ | |
74 | { \ | |
75 | asm (SECTION_OP); \ | |
76 | FUNC (); \ | |
77 | FORCE_CODE_SECTION_ALIGN \ | |
78 | asm (TEXT_SECTION_ASM_OP); \ | |
79 | } | |
036cfb36 AO |
80 | #endif |
81 | ||
abe92a04 RS |
82 | #if defined(OBJECT_FORMAT_ELF) \ |
83 | && !defined(OBJECT_FORMAT_FLAT) \ | |
84 | && defined(HAVE_LD_EH_FRAME_HDR) \ | |
72c7c913 | 85 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
275b60d6 JJ |
86 | && defined(__GLIBC__) && __GLIBC__ >= 2 |
87 | #include <link.h> | |
212db394 JZ |
88 | /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h. |
89 | But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */ | |
90 | # if !defined(__UCLIBC__) \ | |
91 | && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ | |
275b60d6 JJ |
92 | || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) |
93 | # define USE_PT_GNU_EH_FRAME | |
94 | # endif | |
95 | #endif | |
96 | #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME) | |
97 | # define USE_EH_FRAME_REGISTRY | |
98 | #endif | |
1a35e62d | 99 | #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY |
96d0f4dc JJ |
100 | # define EH_FRAME_SECTION_CONST const |
101 | #else | |
102 | # define EH_FRAME_SECTION_CONST | |
103 | #endif | |
275b60d6 | 104 | |
3fc95619 UD |
105 | #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \ |
106 | && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP) | |
107 | # define HIDDEN_DTOR_LIST_END | |
108 | #endif | |
109 | ||
8f08ea1e | 110 | /* We do not want to add the weak attribute to the declarations of these |
52a11cbf RH |
111 | routines in unwind-dw2-fde.h because that will cause the definition of |
112 | these symbols to be weak as well. | |
8f08ea1e L |
113 | |
114 | This exposes a core issue, how to handle creating weak references vs | |
115 | how to create weak definitions. Either we have to have the definition | |
116 | of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or | |
117 | have a second declaration if we want a function's references to be weak, | |
118 | but not its definition. | |
119 | ||
120 | Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until | |
454ff5cb | 121 | one thinks about scaling to larger problems -- i.e., the condition under |
8f08ea1e L |
122 | which TARGET_WEAK_ATTRIBUTE is active will eventually get far too |
123 | complicated. | |
124 | ||
125 | So, we take an approach similar to #pragma weak -- we have a second | |
126 | declaration for functions that we want to have weak references. | |
127 | ||
128 | Neither way is particularly good. */ | |
129 | ||
130 | /* References to __register_frame_info and __deregister_frame_info should | |
131 | be weak in this file if at all possible. */ | |
a30794da | 132 | extern void __register_frame_info (const void *, struct object *) |
8f08ea1e | 133 | TARGET_ATTRIBUTE_WEAK; |
a30794da | 134 | extern void __register_frame_info_bases (const void *, struct object *, |
1066e2b5 RH |
135 | void *, void *) |
136 | TARGET_ATTRIBUTE_WEAK; | |
a30794da | 137 | extern void *__deregister_frame_info (const void *) |
8f08ea1e | 138 | TARGET_ATTRIBUTE_WEAK; |
a30794da | 139 | extern void *__deregister_frame_info_bases (const void *) |
101fa48c | 140 | TARGET_ATTRIBUTE_WEAK; |
525996eb | 141 | extern void __do_global_ctors_1 (void); |
8f08ea1e | 142 | |
213f974a RH |
143 | /* Likewise for _Jv_RegisterClasses. */ |
144 | extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
145 | ||
68d69835 JM |
146 | #ifdef OBJECT_FORMAT_ELF |
147 | ||
148 | /* Declare a pointer to void function type. */ | |
149 | typedef void (*func_ptr) (void); | |
150 | #define STATIC static | |
151 | ||
152 | #else /* OBJECT_FORMAT_ELF */ | |
153 | ||
dc17e9e9 RS |
154 | #include "gbl-ctors.h" |
155 | ||
68d69835 JM |
156 | #define STATIC |
157 | ||
158 | #endif /* OBJECT_FORMAT_ELF */ | |
dc17e9e9 RS |
159 | |
160 | #ifdef CRT_BEGIN | |
161 | ||
213f974a RH |
162 | /* NOTE: In order to be able to support SVR4 shared libraries, we arrange |
163 | to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
164 | __DTOR_END__ } per root executable and also one set of these symbols | |
165 | per shared library. So in any given whole process image, we may have | |
166 | multiple definitions of each of these symbols. In order to prevent | |
167 | these definitions from conflicting with one another, and in order to | |
168 | ensure that the proper lists are used for the initialization/finalization | |
169 | of each individual shared library (respectively), we give these symbols | |
170 | only internal (i.e. `static') linkage, and we also make it a point to | |
171 | refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
172 | symbol in crtbegin.o, where they are defined. */ | |
173 | ||
174 | /* The -1 is a flag to __do_global_[cd]tors indicating that this table | |
175 | does not start with a count of elements. */ | |
176 | #ifdef CTOR_LIST_BEGIN | |
177 | CTOR_LIST_BEGIN; | |
178 | #elif defined(CTORS_SECTION_ASM_OP) | |
179 | /* Hack: force cc1 to switch to .data section early, so that assembling | |
180 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
181 | static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
182 | asm (CTORS_SECTION_ASM_OP); | |
183 | STATIC func_ptr __CTOR_LIST__[1] | |
184 | __attribute__ ((__unused__, aligned(sizeof(func_ptr)))) | |
185 | = { (func_ptr) (-1) }; | |
186 | #else | |
187 | STATIC func_ptr __CTOR_LIST__[1] | |
188 | __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr)))) | |
189 | = { (func_ptr) (-1) }; | |
190 | #endif /* __CTOR_LIST__ alternatives */ | |
191 | ||
192 | #ifdef DTOR_LIST_BEGIN | |
193 | DTOR_LIST_BEGIN; | |
194 | #elif defined(DTORS_SECTION_ASM_OP) | |
195 | asm (DTORS_SECTION_ASM_OP); | |
196 | STATIC func_ptr __DTOR_LIST__[1] | |
197 | __attribute__ ((aligned(sizeof(func_ptr)))) | |
198 | = { (func_ptr) (-1) }; | |
199 | #else | |
200 | STATIC func_ptr __DTOR_LIST__[1] | |
201 | __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
202 | = { (func_ptr) (-1) }; | |
203 | #endif /* __DTOR_LIST__ alternatives */ | |
204 | ||
618939de | 205 | #ifdef USE_EH_FRAME_REGISTRY |
213f974a RH |
206 | /* Stick a label at the beginning of the frame unwind info so we can register |
207 | and deregister it with the exception handling library code. */ | |
96d0f4dc | 208 | STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] |
213f974a RH |
209 | __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4))) |
210 | = { }; | |
618939de | 211 | #endif /* USE_EH_FRAME_REGISTRY */ |
213f974a RH |
212 | |
213 | #ifdef JCR_SECTION_NAME | |
214 | /* Stick a label at the beginning of the java class registration info | |
215 | so we can register them properly. */ | |
213f974a RH |
216 | STATIC void *__JCR_LIST__[] |
217 | __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*)))) | |
218 | = { }; | |
219 | #endif /* JCR_SECTION_NAME */ | |
220 | ||
7abc66b1 | 221 | #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP) |
29d2c7a5 | 222 | |
68d69835 JM |
223 | #ifdef OBJECT_FORMAT_ELF |
224 | ||
fc693822 | 225 | /* Declare the __dso_handle variable. It should have a unique value |
6a9c5260 UD |
226 | in every shared-object; in a main program its value is zero. The |
227 | object should in any case be protected. This means the instance | |
228 | in one DSO or the main program is not used in another object. The | |
229 | dynamic linker takes care of this. */ | |
230 | ||
a0cfeb0f DD |
231 | #ifdef TARGET_LIBGCC_SDATA_SECTION |
232 | extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
233 | #endif | |
6a9c5260 | 234 | #ifdef HAVE_GAS_HIDDEN |
47bd70b5 | 235 | extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); |
6a9c5260 | 236 | #endif |
fc693822 MM |
237 | #ifdef CRTSTUFFS_O |
238 | void *__dso_handle = &__dso_handle; | |
239 | #else | |
240 | void *__dso_handle = 0; | |
241 | #endif | |
242 | ||
243 | /* The __cxa_finalize function may not be available so we use only a | |
244 | weak declaration. */ | |
245 | extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
246 | ||
68d69835 JM |
247 | /* Run all the global destructors on exit from the program. */ |
248 | ||
249 | /* Some systems place the number of pointers in the first word of the | |
250 | table. On SVR4 however, that word is -1. In all cases, the table is | |
251 | null-terminated. On SVR4, we start from the beginning of the list and | |
252 | invoke each per-compilation-unit destructor routine in order | |
253 | until we find that null. | |
254 | ||
255 | Note that this function MUST be static. There will be one of these | |
256 | functions in each root executable and one in each shared library, but | |
257 | although they all have the same code, each one is unique in that it | |
258 | refers to one particular associated `__DTOR_LIST__' which belongs to the | |
b40b9d93 MS |
259 | same particular root executable or shared library file. |
260 | ||
261 | On some systems, this routine is run more than once from the .fini, | |
262 | when exit is called recursively, so we arrange to remember where in | |
263 | the list we left off processing, and we resume at that point, | |
264 | should we be re-invoked. */ | |
68d69835 | 265 | |
cea3bd3e | 266 | static void __attribute__((used)) |
3cc22c31 | 267 | __do_global_dtors_aux (void) |
68d69835 | 268 | { |
7abc66b1 | 269 | static _Bool completed; |
5041a61c | 270 | |
1066e2b5 | 271 | if (__builtin_expect (completed, 0)) |
5041a61c JL |
272 | return; |
273 | ||
2a14e214 MM |
274 | #ifdef CRTSTUFFS_O |
275 | if (__cxa_finalize) | |
fc693822 | 276 | __cxa_finalize (__dso_handle); |
2a14e214 | 277 | #endif |
fc693822 | 278 | |
7abc66b1 JB |
279 | #ifdef FINI_ARRAY_SECTION_ASM_OP |
280 | /* If we are using .fini_array then destructors will be run via that | |
281 | mechanism. */ | |
3fc95619 UD |
282 | #elif defined(HIDDEN_DTOR_LIST_END) |
283 | { | |
284 | /* Safer version that makes sure only .dtors function pointers are | |
285 | called even if the static variable is maliciously changed. */ | |
286 | extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); | |
287 | static size_t dtor_idx; | |
288 | const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; | |
289 | func_ptr f; | |
290 | ||
291 | while (dtor_idx < max_idx) | |
292 | { | |
293 | f = __DTOR_LIST__[++dtor_idx]; | |
294 | f (); | |
295 | } | |
296 | } | |
7abc66b1 | 297 | #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ |
3fc95619 UD |
298 | { |
299 | static func_ptr *p = __DTOR_LIST__ + 1; | |
300 | func_ptr f; | |
301 | ||
302 | while ((f = *p)) | |
303 | { | |
304 | p++; | |
305 | f (); | |
306 | } | |
307 | } | |
7abc66b1 | 308 | #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ |
0021b564 | 309 | |
275b60d6 | 310 | #ifdef USE_EH_FRAME_REGISTRY |
f691dc3b | 311 | #ifdef CRT_GET_RFIB_DATA |
101fa48c RH |
312 | /* If we used the new __register_frame_info_bases interface, |
313 | make sure that we deregister from the same place. */ | |
314 | if (__deregister_frame_info_bases) | |
315 | __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
316 | #else | |
8f08ea1e L |
317 | if (__deregister_frame_info) |
318 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
0021b564 | 319 | #endif |
101fa48c RH |
320 | #endif |
321 | ||
5041a61c | 322 | completed = 1; |
68d69835 JM |
323 | } |
324 | ||
325 | /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
7abc66b1 | 326 | #ifdef FINI_SECTION_ASM_OP |
cea3bd3e | 327 | CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) |
6d83cb32 | 328 | #elif defined (FINI_ARRAY_SECTION_ASM_OP) |
7abc66b1 JB |
329 | static func_ptr __do_global_dtors_aux_fini_array_entry[] |
330 | __attribute__ ((__unused__, section(".fini_array"))) | |
331 | = { __do_global_dtors_aux }; | |
6d83cb32 DR |
332 | #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */ |
333 | static void __attribute__((used)) | |
334 | __do_global_dtors_aux_1 (void) | |
335 | { | |
336 | atexit (__do_global_dtors_aux); | |
337 | } | |
338 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_dtors_aux_1) | |
339 | #endif | |
68d69835 | 340 | |
275b60d6 | 341 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
6d8ccdbb JL |
342 | /* Stick a call to __register_frame_info into the .init section. For some |
343 | reason calls with no arguments work more reliably in .init, so stick the | |
344 | call in another function. */ | |
0021b564 | 345 | |
cea3bd3e | 346 | static void __attribute__((used)) |
3cc22c31 | 347 | frame_dummy (void) |
0021b564 | 348 | { |
275b60d6 | 349 | #ifdef USE_EH_FRAME_REGISTRY |
956d6950 | 350 | static struct object object; |
f691dc3b | 351 | #ifdef CRT_GET_RFIB_DATA |
1066e2b5 | 352 | void *tbase, *dbase; |
1066e2b5 | 353 | tbase = 0; |
1066e2b5 | 354 | CRT_GET_RFIB_DATA (dbase); |
1066e2b5 RH |
355 | if (__register_frame_info_bases) |
356 | __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
357 | #else | |
8f08ea1e L |
358 | if (__register_frame_info) |
359 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
f691dc3b | 360 | #endif /* CRT_GET_RFIB_DATA */ |
4505024e | 361 | #endif /* USE_EH_FRAME_REGISTRY */ |
213f974a | 362 | #ifdef JCR_SECTION_NAME |
bfccaa6f JJ |
363 | if (__JCR_LIST__[0]) |
364 | { | |
365 | void (*register_classes) (void *) = _Jv_RegisterClasses; | |
366 | __asm ("" : "+r" (register_classes)); | |
367 | if (register_classes) | |
368 | register_classes (__JCR_LIST__); | |
369 | } | |
213f974a | 370 | #endif /* JCR_SECTION_NAME */ |
0021b564 JM |
371 | } |
372 | ||
7abc66b1 | 373 | #ifdef INIT_SECTION_ASM_OP |
cea3bd3e | 374 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy) |
7abc66b1 JB |
375 | #else /* defined(INIT_SECTION_ASM_OP) */ |
376 | static func_ptr __frame_dummy_init_array_entry[] | |
377 | __attribute__ ((__unused__, section(".init_array"))) | |
378 | = { frame_dummy }; | |
379 | #endif /* !defined(INIT_SECTION_ASM_OP) */ | |
4505024e | 380 | #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ |
0021b564 | 381 | |
68d69835 JM |
382 | #else /* OBJECT_FORMAT_ELF */ |
383 | ||
b335c2cc | 384 | /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o |
b71a4aa9 | 385 | and once in crtend.o). It must be declared static to avoid a link |
b335c2cc TW |
386 | error. Here, we define __do_global_ctors as an externally callable |
387 | function. It is externally callable so that __main can invoke it when | |
388 | INVOKE__main is defined. This has the additional effect of forcing cc1 | |
389 | to switch to the .text section. */ | |
0f41302f | 390 | |
d1e51320 | 391 | static void __do_global_ctors_aux (void); |
3cc22c31 JL |
392 | void |
393 | __do_global_ctors (void) | |
329d2160 | 394 | { |
29d2c7a5 RH |
395 | #ifdef INVOKE__main |
396 | /* If __main won't actually call __do_global_ctors then it doesn't matter | |
397 | what's inside the function. The inside of __do_global_ctors_aux is | |
398 | called automatically in that case. And the Alliant fx2800 linker | |
399 | crashes on this reference. So prevent the crash. */ | |
329d2160 RS |
400 | __do_global_ctors_aux (); |
401 | #endif | |
402 | } | |
dc17e9e9 RS |
403 | |
404 | asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ | |
405 | ||
406 | /* A routine to invoke all of the global constructors upon entry to the | |
407 | program. We put this into the .init section (for systems that have | |
408 | such a thing) so that we can properly perform the construction of | |
6d2f8887 | 409 | file-scope static-storage C++ objects within shared libraries. */ |
dc17e9e9 | 410 | |
cea3bd3e | 411 | static void __attribute__((used)) |
3cc22c31 | 412 | __do_global_ctors_aux (void) /* prologue goes in .init section */ |
dc17e9e9 | 413 | { |
cea3bd3e | 414 | FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ |
dc17e9e9 RS |
415 | asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ |
416 | DO_GLOBAL_CTORS_BODY; | |
451fbdf2 | 417 | atexit (__do_global_dtors); |
dc17e9e9 RS |
418 | } |
419 | ||
68d69835 | 420 | #endif /* OBJECT_FORMAT_ELF */ |
fe1fd353 | 421 | |
29d2c7a5 | 422 | #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ |
fe1fd353 | 423 | |
af8e5a0e RO |
424 | extern void __do_global_dtors (void); |
425 | ||
fe1fd353 JM |
426 | /* This case is used by the Irix 6 port, which supports named sections but |
427 | not an SVR4-style .fini section. __do_global_dtors can be non-static | |
0021b564 JM |
428 | in this case because we protect it with -hidden_symbol. */ |
429 | ||
fe1fd353 | 430 | void |
3cc22c31 | 431 | __do_global_dtors (void) |
fe1fd353 | 432 | { |
1066e2b5 RH |
433 | func_ptr *p, f; |
434 | for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
435 | f (); | |
0021b564 | 436 | |
275b60d6 | 437 | #ifdef USE_EH_FRAME_REGISTRY |
8f08ea1e L |
438 | if (__deregister_frame_info) |
439 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
0021b564 | 440 | #endif |
fe1fd353 | 441 | } |
35a42f5f | 442 | |
275b60d6 | 443 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
29d2c7a5 RH |
444 | /* A helper function for __do_global_ctors, which is in crtend.o. Here |
445 | in crtbegin.o, we can reference a couple of symbols not visible there. | |
446 | Plus, since we're before libgcc.a, we have no problems referencing | |
447 | functions from there. */ | |
35a42f5f | 448 | void |
29d2c7a5 | 449 | __do_global_ctors_1(void) |
35a42f5f | 450 | { |
275b60d6 | 451 | #ifdef USE_EH_FRAME_REGISTRY |
35a42f5f | 452 | static struct object object; |
8f08ea1e L |
453 | if (__register_frame_info) |
454 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
b335c2cc | 455 | #endif |
6351543d | 456 | #ifdef JCR_SECTION_NAME |
bfccaa6f JJ |
457 | if (__JCR_LIST__[0]) |
458 | { | |
459 | void (*register_classes) (void *) = _Jv_RegisterClasses; | |
460 | __asm ("" : "+r" (register_classes)); | |
461 | if (register_classes) | |
462 | register_classes (__JCR_LIST__); | |
463 | } | |
213f974a RH |
464 | #endif |
465 | } | |
4505024e | 466 | #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ |
6351543d | 467 | |
29d2c7a5 RH |
468 | #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ |
469 | #error "What are you doing with crtstuff.c, then?" | |
470 | #endif | |
471 | ||
472 | #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
473 | ||
474 | /* Put a word containing zero at the end of each of our two lists of function | |
475 | addresses. Note that the words defined here go into the .ctors and .dtors | |
476 | sections of the crtend.o file, and since that file is always linked in | |
477 | last, these words naturally end up at the very ends of the two lists | |
478 | contained in these two sections. */ | |
479 | ||
480 | #ifdef CTOR_LIST_END | |
481 | CTOR_LIST_END; | |
482 | #elif defined(CTORS_SECTION_ASM_OP) | |
483 | /* Hack: force cc1 to switch to .data section early, so that assembling | |
484 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
485 | static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
486 | asm (CTORS_SECTION_ASM_OP); | |
487 | STATIC func_ptr __CTOR_END__[1] | |
488 | __attribute__((aligned(sizeof(func_ptr)))) | |
489 | = { (func_ptr) 0 }; | |
490 | #else | |
491 | STATIC func_ptr __CTOR_END__[1] | |
492 | __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
493 | = { (func_ptr) 0 }; | |
494 | #endif | |
495 | ||
496 | #ifdef DTOR_LIST_END | |
497 | DTOR_LIST_END; | |
3fc95619 UD |
498 | #elif defined(HIDDEN_DTOR_LIST_END) |
499 | #ifdef DTORS_SECTION_ASM_OP | |
500 | asm (DTORS_SECTION_ASM_OP); | |
501 | #endif | |
502 | func_ptr __DTOR_END__[1] | |
503 | __attribute__ ((unused, | |
504 | #ifndef DTORS_SECTION_ASM_OP | |
505 | section(".dtors"), | |
506 | #endif | |
507 | aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
508 | = { (func_ptr) 0 }; | |
29d2c7a5 RH |
509 | #elif defined(DTORS_SECTION_ASM_OP) |
510 | asm (DTORS_SECTION_ASM_OP); | |
511 | STATIC func_ptr __DTOR_END__[1] | |
512 | __attribute__ ((unused, aligned(sizeof(func_ptr)))) | |
513 | = { (func_ptr) 0 }; | |
514 | #else | |
515 | STATIC func_ptr __DTOR_END__[1] | |
516 | __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr)))) | |
517 | = { (func_ptr) 0 }; | |
518 | #endif | |
dc17e9e9 | 519 | |
29d2c7a5 RH |
520 | #ifdef EH_FRAME_SECTION_NAME |
521 | /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; | |
522 | this would be the 'length' field in a real FDE. */ | |
61f03aba RH |
523 | # if __INT_MAX__ == 2147483647 |
524 | typedef int int32; | |
525 | # elif __LONG_MAX__ == 2147483647 | |
526 | typedef long int32; | |
527 | # elif __SHRT_MAX__ == 2147483647 | |
528 | typedef short int32; | |
529 | # else | |
530 | # error "Missing a 4 byte integer" | |
531 | # endif | |
532 | STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
533 | __attribute__ ((unused, section(EH_FRAME_SECTION_NAME), | |
534 | aligned(sizeof(int32)))) | |
29d2c7a5 | 535 | = { 0 }; |
f3a8e4f5 | 536 | #endif /* EH_FRAME_SECTION_NAME */ |
29d2c7a5 RH |
537 | |
538 | #ifdef JCR_SECTION_NAME | |
539 | /* Null terminate the .jcr section array. */ | |
540 | STATIC void *__JCR_END__[1] | |
541 | __attribute__ ((unused, section(JCR_SECTION_NAME), | |
542 | aligned(sizeof(void *)))) | |
543 | = { 0 }; | |
544 | #endif /* JCR_SECTION_NAME */ | |
dc17e9e9 | 545 | |
7abc66b1 JB |
546 | #ifdef INIT_ARRAY_SECTION_ASM_OP |
547 | ||
548 | /* If we are using .init_array, there is nothing to do. */ | |
549 | ||
550 | #elif defined(INIT_SECTION_ASM_OP) | |
dc17e9e9 | 551 | |
68d69835 | 552 | #ifdef OBJECT_FORMAT_ELF |
cea3bd3e | 553 | static void __attribute__((used)) |
3cc22c31 | 554 | __do_global_ctors_aux (void) |
68d69835 JM |
555 | { |
556 | func_ptr *p; | |
557 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
558 | (*p) (); | |
559 | } | |
560 | ||
561 | /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
cea3bd3e | 562 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux) |
68d69835 JM |
563 | #else /* OBJECT_FORMAT_ELF */ |
564 | ||
565 | /* Stick the real initialization code, followed by a normal sort of | |
566 | function epilogue at the very end of the .init section for this | |
567 | entire root executable file or for this entire shared library file. | |
568 | ||
569 | Note that we use some tricks here to get *just* the body and just | |
570 | a function epilogue (but no function prologue) into the .init | |
9faa82d8 | 571 | section of the crtend.o file. Specifically, we switch to the .text |
68d69835 JM |
572 | section, start to define a function, and then we switch to the .init |
573 | section just before the body code. | |
574 | ||
575 | Earlier on, we put the corresponding function prologue into the .init | |
576 | section of the crtbegin.o file (which will be linked in first). | |
577 | ||
578 | Note that we want to invoke all constructors for C++ file-scope static- | |
579 | storage objects AFTER any other possible initialization actions which | |
580 | may be performed by the code in the .init section contributions made by | |
581 | other libraries, etc. That's because those other initializations may | |
582 | include setup operations for very primitive things (e.g. initializing | |
583 | the state of the floating-point coprocessor, etc.) which should be done | |
0f41302f | 584 | before we start to execute any of the user's code. */ |
dc17e9e9 RS |
585 | |
586 | static void | |
3cc22c31 | 587 | __do_global_ctors_aux (void) /* prologue goes in .text section */ |
dc17e9e9 RS |
588 | { |
589 | asm (INIT_SECTION_ASM_OP); | |
590 | DO_GLOBAL_CTORS_BODY; | |
451fbdf2 | 591 | atexit (__do_global_dtors); |
e5e809f4 JL |
592 | } /* epilogue and body go in .init section */ |
593 | ||
cea3bd3e | 594 | FORCE_CODE_SECTION_ALIGN |
e5e809f4 | 595 | asm (TEXT_SECTION_ASM_OP); |
dc17e9e9 | 596 | |
68d69835 JM |
597 | #endif /* OBJECT_FORMAT_ELF */ |
598 | ||
29d2c7a5 | 599 | #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ |
fe1fd353 | 600 | |
af8e5a0e RO |
601 | extern void __do_global_ctors (void); |
602 | ||
fe1fd353 JM |
603 | /* This case is used by the Irix 6 port, which supports named sections but |
604 | not an SVR4-style .init section. __do_global_ctors can be non-static | |
0021b564 | 605 | in this case because we protect it with -hidden_symbol. */ |
fe1fd353 | 606 | void |
3cc22c31 | 607 | __do_global_ctors (void) |
fe1fd353 JM |
608 | { |
609 | func_ptr *p; | |
275b60d6 | 610 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
29d2c7a5 | 611 | __do_global_ctors_1(); |
0021b564 | 612 | #endif |
fe1fd353 JM |
613 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
614 | (*p) (); | |
615 | } | |
68d69835 | 616 | |
29d2c7a5 RH |
617 | #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ |
618 | #error "What are you doing with crtstuff.c, then?" | |
b335c2cc | 619 | #endif |
dc17e9e9 | 620 | |
29d2c7a5 RH |
621 | #else /* ! CRT_BEGIN && ! CRT_END */ |
622 | #error "One of CRT_BEGIN or CRT_END must be defined." | |
b335c2cc | 623 | #endif |