]>
Commit | Line | Data |
---|---|---|
9d13f5c4 | 1 | /* Specialized bits of code needed to support construction and |
2 | destruction of file-scope objects in C++ code. | |
f2397fc4 | 3 | Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
4 | 2002, 2003, 2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc. | |
31dcf09a | 5 | Contributed by Ron Guilmette (rfg@monkeys.com). |
9d13f5c4 | 6 | |
f12b58b3 | 7 | This file is part of GCC. |
9d13f5c4 | 8 | |
f12b58b3 | 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 | |
6bc9506f | 11 | Software Foundation; either version 3, or (at your option) any later |
f12b58b3 | 12 | version. |
9d13f5c4 | 13 | |
f12b58b3 | 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. | |
9d13f5c4 | 18 | |
6bc9506f | 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/>. */ | |
9d13f5c4 | 27 | |
23573244 | 28 | /* This file is a bit like libgcc2.c in that it is compiled |
9d13f5c4 | 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 | ||
5dd605c6 | 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.) | |
9d13f5c4 | 46 | |
47 | This file must be compiled with gcc. */ | |
48 | ||
fece7655 | 49 | /* Target machine header files require this define. */ |
50 | #define IN_LIBGCC2 | |
51 | ||
dd41a27b | 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" | |
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" | |
df4b504c | 64 | #include "unwind-dw2-fde.h" |
9d13f5c4 | 65 | |
e1ff7102 | 66 | #ifndef FORCE_CODE_SECTION_ALIGN |
67 | # define FORCE_CODE_SECTION_ALIGN | |
68 | #endif | |
69 | ||
a815e00c | 70 | #ifndef CRT_CALL_STATIC_FUNCTION |
e1ff7102 | 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 | } | |
a815e00c | 80 | #endif |
81 | ||
f8200b2a | 82 | #if defined(OBJECT_FORMAT_ELF) \ |
83 | && !defined(OBJECT_FORMAT_FLAT) \ | |
84 | && defined(HAVE_LD_EH_FRAME_HDR) \ | |
3cfa3aba | 85 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
0d6378a9 | 86 | && defined(__GLIBC__) && __GLIBC__ >= 2 |
87 | #include <link.h> | |
b0c091c8 | 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) \ | |
0d6378a9 | 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 | |
51601538 | 99 | #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY |
d5720b0c | 100 | # define EH_FRAME_SECTION_CONST const |
101 | #else | |
102 | # define EH_FRAME_SECTION_CONST | |
103 | #endif | |
0d6378a9 | 104 | |
f9e6c0d4 | 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 | ||
ee055d40 | 110 | /* We do not want to add the weak attribute to the declarations of these |
df4b504c | 111 | routines in unwind-dw2-fde.h because that will cause the definition of |
112 | these symbols to be weak as well. | |
ee055d40 | 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 | |
0c6d8c36 | 121 | one thinks about scaling to larger problems -- i.e., the condition under |
ee055d40 | 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. */ | |
49856054 | 132 | extern void __register_frame_info (const void *, struct object *) |
ee055d40 | 133 | TARGET_ATTRIBUTE_WEAK; |
49856054 | 134 | extern void __register_frame_info_bases (const void *, struct object *, |
f6338f42 | 135 | void *, void *) |
136 | TARGET_ATTRIBUTE_WEAK; | |
49856054 | 137 | extern void *__deregister_frame_info (const void *) |
ee055d40 | 138 | TARGET_ATTRIBUTE_WEAK; |
49856054 | 139 | extern void *__deregister_frame_info_bases (const void *) |
ce32d35f | 140 | TARGET_ATTRIBUTE_WEAK; |
db0f4f32 | 141 | extern void __do_global_ctors_1 (void); |
ee055d40 | 142 | |
f313c0e1 | 143 | /* Likewise for _Jv_RegisterClasses. */ |
144 | extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
145 | ||
b7c87ff2 | 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 | ||
9d13f5c4 | 154 | #include "gbl-ctors.h" |
155 | ||
b7c87ff2 | 156 | #define STATIC |
157 | ||
158 | #endif /* OBJECT_FORMAT_ELF */ | |
9d13f5c4 | 159 | |
160 | #ifdef CRT_BEGIN | |
161 | ||
f313c0e1 | 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 | ||
fabbeb08 | 205 | #ifdef USE_EH_FRAME_REGISTRY |
f313c0e1 | 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. */ | |
d5720b0c | 208 | STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] |
f313c0e1 | 209 | __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4))) |
210 | = { }; | |
fabbeb08 | 211 | #endif /* USE_EH_FRAME_REGISTRY */ |
f313c0e1 | 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. */ | |
f313c0e1 | 216 | STATIC void *__JCR_LIST__[] |
217 | __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*)))) | |
218 | = { }; | |
219 | #endif /* JCR_SECTION_NAME */ | |
220 | ||
d24bc145 | 221 | #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP) |
584907e7 | 222 | |
b7c87ff2 | 223 | #ifdef OBJECT_FORMAT_ELF |
224 | ||
39b6af4b | 225 | /* Declare the __dso_handle variable. It should have a unique value |
5be729c9 | 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 | ||
91e8ab5c | 231 | #ifdef TARGET_LIBGCC_SDATA_SECTION |
232 | extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
233 | #endif | |
5be729c9 | 234 | #ifdef HAVE_GAS_HIDDEN |
b4cf9ec1 | 235 | extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); |
5be729c9 | 236 | #endif |
39b6af4b | 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 | ||
b7c87ff2 | 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 | |
113f9ca7 | 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. */ | |
b7c87ff2 | 265 | |
e1ff7102 | 266 | static void __attribute__((used)) |
aedb00bf | 267 | __do_global_dtors_aux (void) |
b7c87ff2 | 268 | { |
d24bc145 | 269 | static _Bool completed; |
dade0711 | 270 | |
f6338f42 | 271 | if (__builtin_expect (completed, 0)) |
dade0711 | 272 | return; |
273 | ||
f4513b3d | 274 | #ifdef CRTSTUFFS_O |
275 | if (__cxa_finalize) | |
39b6af4b | 276 | __cxa_finalize (__dso_handle); |
f4513b3d | 277 | #endif |
39b6af4b | 278 | |
d24bc145 | 279 | #ifdef FINI_ARRAY_SECTION_ASM_OP |
280 | /* If we are using .fini_array then destructors will be run via that | |
281 | mechanism. */ | |
f9e6c0d4 | 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 | } | |
d24bc145 | 297 | #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ |
f9e6c0d4 | 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 | } | |
d24bc145 | 308 | #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ |
d757b8c9 | 309 | |
0d6378a9 | 310 | #ifdef USE_EH_FRAME_REGISTRY |
6fa2a5a8 | 311 | #ifdef CRT_GET_RFIB_DATA |
ce32d35f | 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 | |
ee055d40 | 317 | if (__deregister_frame_info) |
318 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
d757b8c9 | 319 | #endif |
ce32d35f | 320 | #endif |
321 | ||
dade0711 | 322 | completed = 1; |
b7c87ff2 | 323 | } |
324 | ||
325 | /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
d24bc145 | 326 | #ifdef FINI_SECTION_ASM_OP |
e1ff7102 | 327 | CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) |
d24bc145 | 328 | #else /* !defined(FINI_SECTION_ASM_OP) */ |
329 | static func_ptr __do_global_dtors_aux_fini_array_entry[] | |
330 | __attribute__ ((__unused__, section(".fini_array"))) | |
331 | = { __do_global_dtors_aux }; | |
332 | #endif /* !defined(FINI_SECTION_ASM_OP) */ | |
b7c87ff2 | 333 | |
0d6378a9 | 334 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
c4fa4c4d | 335 | /* Stick a call to __register_frame_info into the .init section. For some |
336 | reason calls with no arguments work more reliably in .init, so stick the | |
337 | call in another function. */ | |
d757b8c9 | 338 | |
e1ff7102 | 339 | static void __attribute__((used)) |
aedb00bf | 340 | frame_dummy (void) |
d757b8c9 | 341 | { |
0d6378a9 | 342 | #ifdef USE_EH_FRAME_REGISTRY |
ad87de1e | 343 | static struct object object; |
6fa2a5a8 | 344 | #ifdef CRT_GET_RFIB_DATA |
f6338f42 | 345 | void *tbase, *dbase; |
f6338f42 | 346 | tbase = 0; |
f6338f42 | 347 | CRT_GET_RFIB_DATA (dbase); |
f6338f42 | 348 | if (__register_frame_info_bases) |
349 | __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
350 | #else | |
ee055d40 | 351 | if (__register_frame_info) |
352 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
6fa2a5a8 | 353 | #endif /* CRT_GET_RFIB_DATA */ |
71fcebb2 | 354 | #endif /* USE_EH_FRAME_REGISTRY */ |
f313c0e1 | 355 | #ifdef JCR_SECTION_NAME |
69c4cf50 | 356 | if (__JCR_LIST__[0]) |
357 | { | |
358 | void (*register_classes) (void *) = _Jv_RegisterClasses; | |
359 | __asm ("" : "+r" (register_classes)); | |
360 | if (register_classes) | |
361 | register_classes (__JCR_LIST__); | |
362 | } | |
f313c0e1 | 363 | #endif /* JCR_SECTION_NAME */ |
d757b8c9 | 364 | } |
365 | ||
d24bc145 | 366 | #ifdef INIT_SECTION_ASM_OP |
e1ff7102 | 367 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy) |
d24bc145 | 368 | #else /* defined(INIT_SECTION_ASM_OP) */ |
369 | static func_ptr __frame_dummy_init_array_entry[] | |
370 | __attribute__ ((__unused__, section(".init_array"))) | |
371 | = { frame_dummy }; | |
372 | #endif /* !defined(INIT_SECTION_ASM_OP) */ | |
71fcebb2 | 373 | #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ |
d757b8c9 | 374 | |
b7c87ff2 | 375 | #else /* OBJECT_FORMAT_ELF */ |
376 | ||
b13ae905 | 377 | /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o |
d8fa92ab | 378 | and once in crtend.o). It must be declared static to avoid a link |
b13ae905 | 379 | error. Here, we define __do_global_ctors as an externally callable |
380 | function. It is externally callable so that __main can invoke it when | |
381 | INVOKE__main is defined. This has the additional effect of forcing cc1 | |
382 | to switch to the .text section. */ | |
a92771b8 | 383 | |
205b5771 | 384 | static void __do_global_ctors_aux (void); |
aedb00bf | 385 | void |
386 | __do_global_ctors (void) | |
84b64a19 | 387 | { |
584907e7 | 388 | #ifdef INVOKE__main |
389 | /* If __main won't actually call __do_global_ctors then it doesn't matter | |
390 | what's inside the function. The inside of __do_global_ctors_aux is | |
391 | called automatically in that case. And the Alliant fx2800 linker | |
392 | crashes on this reference. So prevent the crash. */ | |
84b64a19 | 393 | __do_global_ctors_aux (); |
394 | #endif | |
395 | } | |
9d13f5c4 | 396 | |
397 | asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ | |
398 | ||
399 | /* A routine to invoke all of the global constructors upon entry to the | |
400 | program. We put this into the .init section (for systems that have | |
401 | such a thing) so that we can properly perform the construction of | |
1e625a2e | 402 | file-scope static-storage C++ objects within shared libraries. */ |
9d13f5c4 | 403 | |
e1ff7102 | 404 | static void __attribute__((used)) |
aedb00bf | 405 | __do_global_ctors_aux (void) /* prologue goes in .init section */ |
9d13f5c4 | 406 | { |
e1ff7102 | 407 | FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ |
9d13f5c4 | 408 | asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ |
409 | DO_GLOBAL_CTORS_BODY; | |
75d3a87b | 410 | atexit (__do_global_dtors); |
9d13f5c4 | 411 | } |
412 | ||
b7c87ff2 | 413 | #endif /* OBJECT_FORMAT_ELF */ |
8313a782 | 414 | |
584907e7 | 415 | #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ |
8313a782 | 416 | |
eb7ed20c | 417 | extern void __do_global_dtors (void); |
418 | ||
8313a782 | 419 | /* This case is used by the Irix 6 port, which supports named sections but |
420 | not an SVR4-style .fini section. __do_global_dtors can be non-static | |
d757b8c9 | 421 | in this case because we protect it with -hidden_symbol. */ |
422 | ||
8313a782 | 423 | void |
aedb00bf | 424 | __do_global_dtors (void) |
8313a782 | 425 | { |
f6338f42 | 426 | func_ptr *p, f; |
427 | for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
428 | f (); | |
d757b8c9 | 429 | |
0d6378a9 | 430 | #ifdef USE_EH_FRAME_REGISTRY |
ee055d40 | 431 | if (__deregister_frame_info) |
432 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
d757b8c9 | 433 | #endif |
8313a782 | 434 | } |
72ac783d | 435 | |
0d6378a9 | 436 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
584907e7 | 437 | /* A helper function for __do_global_ctors, which is in crtend.o. Here |
438 | in crtbegin.o, we can reference a couple of symbols not visible there. | |
439 | Plus, since we're before libgcc.a, we have no problems referencing | |
440 | functions from there. */ | |
72ac783d | 441 | void |
584907e7 | 442 | __do_global_ctors_1(void) |
72ac783d | 443 | { |
0d6378a9 | 444 | #ifdef USE_EH_FRAME_REGISTRY |
72ac783d | 445 | static struct object object; |
ee055d40 | 446 | if (__register_frame_info) |
447 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
b13ae905 | 448 | #endif |
2cee371f | 449 | #ifdef JCR_SECTION_NAME |
69c4cf50 | 450 | if (__JCR_LIST__[0]) |
451 | { | |
452 | void (*register_classes) (void *) = _Jv_RegisterClasses; | |
453 | __asm ("" : "+r" (register_classes)); | |
454 | if (register_classes) | |
455 | register_classes (__JCR_LIST__); | |
456 | } | |
f313c0e1 | 457 | #endif |
458 | } | |
71fcebb2 | 459 | #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ |
2cee371f | 460 | |
584907e7 | 461 | #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ |
462 | #error "What are you doing with crtstuff.c, then?" | |
463 | #endif | |
464 | ||
465 | #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
466 | ||
467 | /* Put a word containing zero at the end of each of our two lists of function | |
468 | addresses. Note that the words defined here go into the .ctors and .dtors | |
469 | sections of the crtend.o file, and since that file is always linked in | |
470 | last, these words naturally end up at the very ends of the two lists | |
471 | contained in these two sections. */ | |
472 | ||
473 | #ifdef CTOR_LIST_END | |
474 | CTOR_LIST_END; | |
475 | #elif defined(CTORS_SECTION_ASM_OP) | |
476 | /* Hack: force cc1 to switch to .data section early, so that assembling | |
477 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
478 | static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
479 | asm (CTORS_SECTION_ASM_OP); | |
480 | STATIC func_ptr __CTOR_END__[1] | |
481 | __attribute__((aligned(sizeof(func_ptr)))) | |
482 | = { (func_ptr) 0 }; | |
483 | #else | |
484 | STATIC func_ptr __CTOR_END__[1] | |
485 | __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
486 | = { (func_ptr) 0 }; | |
487 | #endif | |
488 | ||
489 | #ifdef DTOR_LIST_END | |
490 | DTOR_LIST_END; | |
f9e6c0d4 | 491 | #elif defined(HIDDEN_DTOR_LIST_END) |
492 | #ifdef DTORS_SECTION_ASM_OP | |
493 | asm (DTORS_SECTION_ASM_OP); | |
494 | #endif | |
495 | func_ptr __DTOR_END__[1] | |
496 | __attribute__ ((unused, | |
497 | #ifndef DTORS_SECTION_ASM_OP | |
498 | section(".dtors"), | |
499 | #endif | |
500 | aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
501 | = { (func_ptr) 0 }; | |
584907e7 | 502 | #elif defined(DTORS_SECTION_ASM_OP) |
503 | asm (DTORS_SECTION_ASM_OP); | |
504 | STATIC func_ptr __DTOR_END__[1] | |
505 | __attribute__ ((unused, aligned(sizeof(func_ptr)))) | |
506 | = { (func_ptr) 0 }; | |
507 | #else | |
508 | STATIC func_ptr __DTOR_END__[1] | |
509 | __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr)))) | |
510 | = { (func_ptr) 0 }; | |
511 | #endif | |
9d13f5c4 | 512 | |
584907e7 | 513 | #ifdef EH_FRAME_SECTION_NAME |
514 | /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; | |
515 | this would be the 'length' field in a real FDE. */ | |
743a6f47 | 516 | # if __INT_MAX__ == 2147483647 |
517 | typedef int int32; | |
518 | # elif __LONG_MAX__ == 2147483647 | |
519 | typedef long int32; | |
520 | # elif __SHRT_MAX__ == 2147483647 | |
521 | typedef short int32; | |
522 | # else | |
523 | # error "Missing a 4 byte integer" | |
524 | # endif | |
525 | STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
526 | __attribute__ ((unused, section(EH_FRAME_SECTION_NAME), | |
527 | aligned(sizeof(int32)))) | |
584907e7 | 528 | = { 0 }; |
13c14f1c | 529 | #endif /* EH_FRAME_SECTION_NAME */ |
584907e7 | 530 | |
531 | #ifdef JCR_SECTION_NAME | |
532 | /* Null terminate the .jcr section array. */ | |
533 | STATIC void *__JCR_END__[1] | |
534 | __attribute__ ((unused, section(JCR_SECTION_NAME), | |
535 | aligned(sizeof(void *)))) | |
536 | = { 0 }; | |
537 | #endif /* JCR_SECTION_NAME */ | |
9d13f5c4 | 538 | |
d24bc145 | 539 | #ifdef INIT_ARRAY_SECTION_ASM_OP |
540 | ||
541 | /* If we are using .init_array, there is nothing to do. */ | |
542 | ||
543 | #elif defined(INIT_SECTION_ASM_OP) | |
9d13f5c4 | 544 | |
b7c87ff2 | 545 | #ifdef OBJECT_FORMAT_ELF |
e1ff7102 | 546 | static void __attribute__((used)) |
aedb00bf | 547 | __do_global_ctors_aux (void) |
b7c87ff2 | 548 | { |
549 | func_ptr *p; | |
550 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
551 | (*p) (); | |
552 | } | |
553 | ||
554 | /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
e1ff7102 | 555 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux) |
b7c87ff2 | 556 | #else /* OBJECT_FORMAT_ELF */ |
557 | ||
558 | /* Stick the real initialization code, followed by a normal sort of | |
559 | function epilogue at the very end of the .init section for this | |
560 | entire root executable file or for this entire shared library file. | |
561 | ||
562 | Note that we use some tricks here to get *just* the body and just | |
563 | a function epilogue (but no function prologue) into the .init | |
c3418f42 | 564 | section of the crtend.o file. Specifically, we switch to the .text |
b7c87ff2 | 565 | section, start to define a function, and then we switch to the .init |
566 | section just before the body code. | |
567 | ||
568 | Earlier on, we put the corresponding function prologue into the .init | |
569 | section of the crtbegin.o file (which will be linked in first). | |
570 | ||
571 | Note that we want to invoke all constructors for C++ file-scope static- | |
572 | storage objects AFTER any other possible initialization actions which | |
573 | may be performed by the code in the .init section contributions made by | |
574 | other libraries, etc. That's because those other initializations may | |
575 | include setup operations for very primitive things (e.g. initializing | |
576 | the state of the floating-point coprocessor, etc.) which should be done | |
a92771b8 | 577 | before we start to execute any of the user's code. */ |
9d13f5c4 | 578 | |
579 | static void | |
aedb00bf | 580 | __do_global_ctors_aux (void) /* prologue goes in .text section */ |
9d13f5c4 | 581 | { |
582 | asm (INIT_SECTION_ASM_OP); | |
583 | DO_GLOBAL_CTORS_BODY; | |
75d3a87b | 584 | atexit (__do_global_dtors); |
997d68fe | 585 | } /* epilogue and body go in .init section */ |
586 | ||
e1ff7102 | 587 | FORCE_CODE_SECTION_ALIGN |
997d68fe | 588 | asm (TEXT_SECTION_ASM_OP); |
9d13f5c4 | 589 | |
b7c87ff2 | 590 | #endif /* OBJECT_FORMAT_ELF */ |
591 | ||
584907e7 | 592 | #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ |
8313a782 | 593 | |
eb7ed20c | 594 | extern void __do_global_ctors (void); |
595 | ||
8313a782 | 596 | /* This case is used by the Irix 6 port, which supports named sections but |
597 | not an SVR4-style .init section. __do_global_ctors can be non-static | |
d757b8c9 | 598 | in this case because we protect it with -hidden_symbol. */ |
8313a782 | 599 | void |
aedb00bf | 600 | __do_global_ctors (void) |
8313a782 | 601 | { |
602 | func_ptr *p; | |
0d6378a9 | 603 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
584907e7 | 604 | __do_global_ctors_1(); |
d757b8c9 | 605 | #endif |
8313a782 | 606 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
607 | (*p) (); | |
608 | } | |
b7c87ff2 | 609 | |
584907e7 | 610 | #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ |
611 | #error "What are you doing with crtstuff.c, then?" | |
b13ae905 | 612 | #endif |
9d13f5c4 | 613 | |
584907e7 | 614 | #else /* ! CRT_BEGIN && ! CRT_END */ |
615 | #error "One of CRT_BEGIN or CRT_END must be defined." | |
b13ae905 | 616 | #endif |