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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. | |
5e7b4e25 | 3 | Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, |
cea3bd3e | 4 | 1999, 2000, 2001, 2002 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 | |
11 | Software Foundation; either version 2, or (at your option) any later | |
12 | version. | |
dc17e9e9 | 13 | |
f7af368f JL |
14 | In addition to the permissions in the GNU General Public License, the |
15 | Free Software Foundation gives you unlimited permission to link the | |
16 | compiled version of this file into combinations with other programs, | |
17 | and to distribute those combinations without any restriction coming | |
18 | from the use of this file. (The General Public License restrictions | |
19 | do apply in other respects; for example, they cover modification of | |
20 | the file, and distribution when not linked into a combine | |
21 | executable.) | |
22 | ||
1322177d LB |
23 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
24 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
25 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
26 | for more details. | |
dc17e9e9 RS |
27 | |
28 | You should have received a copy of the GNU General Public License | |
1322177d LB |
29 | along with GCC; see the file COPYING. If not, write to the Free |
30 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
31 | 02111-1307, USA. */ | |
dc17e9e9 | 32 | |
7857f134 | 33 | /* This file is a bit like libgcc2.c in that it is compiled |
dc17e9e9 RS |
34 | multiple times and yields multiple .o files. |
35 | ||
36 | This file is useful on target machines where the object file format | |
37 | supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On | |
38 | such systems, this file allows us to avoid running collect (or any | |
39 | other such slow and painful kludge). Additionally, if the target | |
40 | system supports a .init section, this file allows us to support the | |
41 | linking of C++ code with a non-C++ main program. | |
42 | ||
43 | Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then | |
44 | this file *will* make use of the .init section. If that symbol is | |
45 | not defined however, then the .init section will not be used. | |
46 | ||
37ce5b86 CH |
47 | Currently, only ELF and COFF are supported. It is likely however that |
48 | ROSE could also be supported, if someone was willing to do the work to | |
49 | make whatever (small?) adaptations are needed. (Some work may be | |
50 | needed on the ROSE assembler and linker also.) | |
dc17e9e9 RS |
51 | |
52 | This file must be compiled with gcc. */ | |
53 | ||
54 | /* It is incorrect to include config.h here, because this file is being | |
55 | compiled for the target, and hence definitions concerning only the host | |
56 | do not apply. */ | |
57 | ||
1b5640cd KG |
58 | /* We include auto-host.h here to get HAVE_GAS_HIDDEN. This is |
59 | supposedly valid even though this is a "target" file. */ | |
60 | #include "auto-host.h" | |
eaf4e618 | 61 | #include "tconfig.h" |
2e39bdbe | 62 | #include "tsystem.h" |
4977bab6 ZW |
63 | #include "coretypes.h" |
64 | #include "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 \ | |
79 | asm (TEXT_SECTION_ASM_OP); \ | |
80 | } | |
036cfb36 AO |
81 | #endif |
82 | ||
275b60d6 | 83 | #if defined(OBJECT_FORMAT_ELF) && defined(HAVE_LD_EH_FRAME_HDR) \ |
72c7c913 | 84 | && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
275b60d6 JJ |
85 | && defined(__GLIBC__) && __GLIBC__ >= 2 |
86 | #include <link.h> | |
87 | # if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ | |
88 | || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) | |
89 | # define USE_PT_GNU_EH_FRAME | |
90 | # endif | |
91 | #endif | |
92 | #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME) | |
93 | # define USE_EH_FRAME_REGISTRY | |
94 | #endif | |
96d0f4dc JJ |
95 | #if defined(EH_FRAME_SECTION_NAME) && defined(HAVE_LD_RO_RW_SECTION_MIXING) |
96 | # define EH_FRAME_SECTION_CONST const | |
97 | #else | |
98 | # define EH_FRAME_SECTION_CONST | |
99 | #endif | |
275b60d6 | 100 | |
8f08ea1e | 101 | /* We do not want to add the weak attribute to the declarations of these |
52a11cbf RH |
102 | routines in unwind-dw2-fde.h because that will cause the definition of |
103 | these symbols to be weak as well. | |
8f08ea1e L |
104 | |
105 | This exposes a core issue, how to handle creating weak references vs | |
106 | how to create weak definitions. Either we have to have the definition | |
107 | of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or | |
108 | have a second declaration if we want a function's references to be weak, | |
109 | but not its definition. | |
110 | ||
111 | Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until | |
112 | one thinks about scaling to larger problems -- ie, the condition under | |
113 | which TARGET_WEAK_ATTRIBUTE is active will eventually get far too | |
114 | complicated. | |
115 | ||
116 | So, we take an approach similar to #pragma weak -- we have a second | |
117 | declaration for functions that we want to have weak references. | |
118 | ||
119 | Neither way is particularly good. */ | |
120 | ||
121 | /* References to __register_frame_info and __deregister_frame_info should | |
122 | be weak in this file if at all possible. */ | |
123 | extern void __register_frame_info (void *, struct object *) | |
124 | TARGET_ATTRIBUTE_WEAK; | |
1066e2b5 RH |
125 | extern void __register_frame_info_bases (void *, struct object *, |
126 | void *, void *) | |
127 | TARGET_ATTRIBUTE_WEAK; | |
8f08ea1e L |
128 | extern void *__deregister_frame_info (void *) |
129 | TARGET_ATTRIBUTE_WEAK; | |
101fa48c RH |
130 | extern void *__deregister_frame_info_bases (void *) |
131 | TARGET_ATTRIBUTE_WEAK; | |
8f08ea1e | 132 | |
213f974a RH |
133 | /* Likewise for _Jv_RegisterClasses. */ |
134 | extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
135 | ||
68d69835 JM |
136 | #ifdef OBJECT_FORMAT_ELF |
137 | ||
138 | /* Declare a pointer to void function type. */ | |
139 | typedef void (*func_ptr) (void); | |
140 | #define STATIC static | |
141 | ||
142 | #else /* OBJECT_FORMAT_ELF */ | |
143 | ||
dc17e9e9 RS |
144 | #include "gbl-ctors.h" |
145 | ||
68d69835 JM |
146 | #define STATIC |
147 | ||
148 | #endif /* OBJECT_FORMAT_ELF */ | |
dc17e9e9 RS |
149 | |
150 | #ifdef CRT_BEGIN | |
151 | ||
213f974a RH |
152 | /* NOTE: In order to be able to support SVR4 shared libraries, we arrange |
153 | to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
154 | __DTOR_END__ } per root executable and also one set of these symbols | |
155 | per shared library. So in any given whole process image, we may have | |
156 | multiple definitions of each of these symbols. In order to prevent | |
157 | these definitions from conflicting with one another, and in order to | |
158 | ensure that the proper lists are used for the initialization/finalization | |
159 | of each individual shared library (respectively), we give these symbols | |
160 | only internal (i.e. `static') linkage, and we also make it a point to | |
161 | refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
162 | symbol in crtbegin.o, where they are defined. */ | |
163 | ||
164 | /* The -1 is a flag to __do_global_[cd]tors indicating that this table | |
165 | does not start with a count of elements. */ | |
166 | #ifdef CTOR_LIST_BEGIN | |
167 | CTOR_LIST_BEGIN; | |
168 | #elif defined(CTORS_SECTION_ASM_OP) | |
169 | /* Hack: force cc1 to switch to .data section early, so that assembling | |
170 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
171 | static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
172 | asm (CTORS_SECTION_ASM_OP); | |
173 | STATIC func_ptr __CTOR_LIST__[1] | |
174 | __attribute__ ((__unused__, aligned(sizeof(func_ptr)))) | |
175 | = { (func_ptr) (-1) }; | |
176 | #else | |
177 | STATIC func_ptr __CTOR_LIST__[1] | |
178 | __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr)))) | |
179 | = { (func_ptr) (-1) }; | |
180 | #endif /* __CTOR_LIST__ alternatives */ | |
181 | ||
182 | #ifdef DTOR_LIST_BEGIN | |
183 | DTOR_LIST_BEGIN; | |
184 | #elif defined(DTORS_SECTION_ASM_OP) | |
185 | asm (DTORS_SECTION_ASM_OP); | |
186 | STATIC func_ptr __DTOR_LIST__[1] | |
187 | __attribute__ ((aligned(sizeof(func_ptr)))) | |
188 | = { (func_ptr) (-1) }; | |
189 | #else | |
190 | STATIC func_ptr __DTOR_LIST__[1] | |
191 | __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
192 | = { (func_ptr) (-1) }; | |
193 | #endif /* __DTOR_LIST__ alternatives */ | |
194 | ||
618939de | 195 | #ifdef USE_EH_FRAME_REGISTRY |
213f974a RH |
196 | /* Stick a label at the beginning of the frame unwind info so we can register |
197 | and deregister it with the exception handling library code. */ | |
96d0f4dc | 198 | STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] |
213f974a RH |
199 | __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4))) |
200 | = { }; | |
618939de | 201 | #endif /* USE_EH_FRAME_REGISTRY */ |
213f974a RH |
202 | |
203 | #ifdef JCR_SECTION_NAME | |
204 | /* Stick a label at the beginning of the java class registration info | |
205 | so we can register them properly. */ | |
213f974a RH |
206 | STATIC void *__JCR_LIST__[] |
207 | __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*)))) | |
208 | = { }; | |
209 | #endif /* JCR_SECTION_NAME */ | |
210 | ||
29d2c7a5 RH |
211 | #ifdef INIT_SECTION_ASM_OP |
212 | ||
68d69835 JM |
213 | #ifdef OBJECT_FORMAT_ELF |
214 | ||
fc693822 | 215 | /* Declare the __dso_handle variable. It should have a unique value |
6a9c5260 UD |
216 | in every shared-object; in a main program its value is zero. The |
217 | object should in any case be protected. This means the instance | |
218 | in one DSO or the main program is not used in another object. The | |
219 | dynamic linker takes care of this. */ | |
220 | ||
6a9c5260 | 221 | #ifdef HAVE_GAS_HIDDEN |
47bd70b5 | 222 | extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); |
6a9c5260 | 223 | #endif |
fc693822 MM |
224 | #ifdef CRTSTUFFS_O |
225 | void *__dso_handle = &__dso_handle; | |
226 | #else | |
227 | void *__dso_handle = 0; | |
228 | #endif | |
229 | ||
230 | /* The __cxa_finalize function may not be available so we use only a | |
231 | weak declaration. */ | |
232 | extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
233 | ||
68d69835 JM |
234 | /* Run all the global destructors on exit from the program. */ |
235 | ||
236 | /* Some systems place the number of pointers in the first word of the | |
237 | table. On SVR4 however, that word is -1. In all cases, the table is | |
238 | null-terminated. On SVR4, we start from the beginning of the list and | |
239 | invoke each per-compilation-unit destructor routine in order | |
240 | until we find that null. | |
241 | ||
242 | Note that this function MUST be static. There will be one of these | |
243 | functions in each root executable and one in each shared library, but | |
244 | although they all have the same code, each one is unique in that it | |
245 | refers to one particular associated `__DTOR_LIST__' which belongs to the | |
b40b9d93 MS |
246 | same particular root executable or shared library file. |
247 | ||
248 | On some systems, this routine is run more than once from the .fini, | |
249 | when exit is called recursively, so we arrange to remember where in | |
250 | the list we left off processing, and we resume at that point, | |
251 | should we be re-invoked. */ | |
68d69835 | 252 | |
cea3bd3e | 253 | static void __attribute__((used)) |
3cc22c31 | 254 | __do_global_dtors_aux (void) |
68d69835 | 255 | { |
b40b9d93 | 256 | static func_ptr *p = __DTOR_LIST__ + 1; |
cea3bd3e | 257 | static _Bool completed; |
1066e2b5 | 258 | func_ptr f; |
5041a61c | 259 | |
1066e2b5 | 260 | if (__builtin_expect (completed, 0)) |
5041a61c JL |
261 | return; |
262 | ||
2a14e214 MM |
263 | #ifdef CRTSTUFFS_O |
264 | if (__cxa_finalize) | |
fc693822 | 265 | __cxa_finalize (__dso_handle); |
2a14e214 | 266 | #endif |
fc693822 | 267 | |
1066e2b5 | 268 | while ((f = *p)) |
b40b9d93 MS |
269 | { |
270 | p++; | |
1066e2b5 | 271 | f (); |
b40b9d93 | 272 | } |
0021b564 | 273 | |
275b60d6 | 274 | #ifdef USE_EH_FRAME_REGISTRY |
101fa48c RH |
275 | #if defined(CRT_GET_RFIB_TEXT) || defined(CRT_GET_RFIB_DATA) |
276 | /* If we used the new __register_frame_info_bases interface, | |
277 | make sure that we deregister from the same place. */ | |
278 | if (__deregister_frame_info_bases) | |
279 | __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
280 | #else | |
8f08ea1e L |
281 | if (__deregister_frame_info) |
282 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
0021b564 | 283 | #endif |
101fa48c RH |
284 | #endif |
285 | ||
5041a61c | 286 | completed = 1; |
68d69835 JM |
287 | } |
288 | ||
289 | /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
cea3bd3e | 290 | CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) |
68d69835 | 291 | |
275b60d6 | 292 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
6d8ccdbb JL |
293 | /* Stick a call to __register_frame_info into the .init section. For some |
294 | reason calls with no arguments work more reliably in .init, so stick the | |
295 | call in another function. */ | |
0021b564 | 296 | |
cea3bd3e | 297 | static void __attribute__((used)) |
3cc22c31 | 298 | frame_dummy (void) |
0021b564 | 299 | { |
275b60d6 | 300 | #ifdef USE_EH_FRAME_REGISTRY |
956d6950 | 301 | static struct object object; |
1066e2b5 RH |
302 | #if defined(CRT_GET_RFIB_TEXT) || defined(CRT_GET_RFIB_DATA) |
303 | void *tbase, *dbase; | |
304 | #ifdef CRT_GET_RFIB_TEXT | |
305 | CRT_GET_RFIB_TEXT (tbase); | |
306 | #else | |
307 | tbase = 0; | |
308 | #endif | |
309 | #ifdef CRT_GET_RFIB_DATA | |
310 | CRT_GET_RFIB_DATA (dbase); | |
311 | #else | |
312 | dbase = 0; | |
313 | #endif | |
314 | if (__register_frame_info_bases) | |
315 | __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
316 | #else | |
8f08ea1e L |
317 | if (__register_frame_info) |
318 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
1066e2b5 | 319 | #endif |
4505024e | 320 | #endif /* USE_EH_FRAME_REGISTRY */ |
213f974a RH |
321 | #ifdef JCR_SECTION_NAME |
322 | if (__JCR_LIST__[0] && _Jv_RegisterClasses) | |
323 | _Jv_RegisterClasses (__JCR_LIST__); | |
324 | #endif /* JCR_SECTION_NAME */ | |
0021b564 JM |
325 | } |
326 | ||
cea3bd3e | 327 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy) |
4505024e | 328 | #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ |
0021b564 | 329 | |
68d69835 JM |
330 | #else /* OBJECT_FORMAT_ELF */ |
331 | ||
b335c2cc | 332 | /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o |
b71a4aa9 | 333 | and once in crtend.o). It must be declared static to avoid a link |
b335c2cc TW |
334 | error. Here, we define __do_global_ctors as an externally callable |
335 | function. It is externally callable so that __main can invoke it when | |
336 | INVOKE__main is defined. This has the additional effect of forcing cc1 | |
337 | to switch to the .text section. */ | |
0f41302f | 338 | |
d1e51320 | 339 | static void __do_global_ctors_aux (void); |
3cc22c31 JL |
340 | void |
341 | __do_global_ctors (void) | |
329d2160 | 342 | { |
29d2c7a5 RH |
343 | #ifdef INVOKE__main |
344 | /* If __main won't actually call __do_global_ctors then it doesn't matter | |
345 | what's inside the function. The inside of __do_global_ctors_aux is | |
346 | called automatically in that case. And the Alliant fx2800 linker | |
347 | crashes on this reference. So prevent the crash. */ | |
329d2160 RS |
348 | __do_global_ctors_aux (); |
349 | #endif | |
350 | } | |
dc17e9e9 RS |
351 | |
352 | asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ | |
353 | ||
5378943d RK |
354 | /* On some svr4 systems, the initial .init section preamble code provided in |
355 | crti.o may do something, such as bump the stack, which we have to | |
356 | undo before we reach the function prologue code for __do_global_ctors | |
357 | (directly below). For such systems, define the macro INIT_SECTION_PREAMBLE | |
0f41302f | 358 | to expand into the code needed to undo the actions of the crti.o file. */ |
5378943d RK |
359 | |
360 | #ifdef INIT_SECTION_PREAMBLE | |
361 | INIT_SECTION_PREAMBLE; | |
362 | #endif | |
363 | ||
dc17e9e9 RS |
364 | /* A routine to invoke all of the global constructors upon entry to the |
365 | program. We put this into the .init section (for systems that have | |
366 | such a thing) so that we can properly perform the construction of | |
6d2f8887 | 367 | file-scope static-storage C++ objects within shared libraries. */ |
dc17e9e9 | 368 | |
cea3bd3e | 369 | static void __attribute__((used)) |
3cc22c31 | 370 | __do_global_ctors_aux (void) /* prologue goes in .init section */ |
dc17e9e9 | 371 | { |
cea3bd3e | 372 | FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ |
dc17e9e9 RS |
373 | asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ |
374 | DO_GLOBAL_CTORS_BODY; | |
451fbdf2 | 375 | atexit (__do_global_dtors); |
dc17e9e9 RS |
376 | } |
377 | ||
68d69835 | 378 | #endif /* OBJECT_FORMAT_ELF */ |
fe1fd353 | 379 | |
29d2c7a5 | 380 | #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ |
fe1fd353 JM |
381 | |
382 | /* This case is used by the Irix 6 port, which supports named sections but | |
383 | not an SVR4-style .fini section. __do_global_dtors can be non-static | |
0021b564 JM |
384 | in this case because we protect it with -hidden_symbol. */ |
385 | ||
fe1fd353 | 386 | void |
3cc22c31 | 387 | __do_global_dtors (void) |
fe1fd353 | 388 | { |
1066e2b5 RH |
389 | func_ptr *p, f; |
390 | for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
391 | f (); | |
0021b564 | 392 | |
275b60d6 | 393 | #ifdef USE_EH_FRAME_REGISTRY |
8f08ea1e L |
394 | if (__deregister_frame_info) |
395 | __deregister_frame_info (__EH_FRAME_BEGIN__); | |
0021b564 | 396 | #endif |
fe1fd353 | 397 | } |
35a42f5f | 398 | |
275b60d6 | 399 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
29d2c7a5 RH |
400 | /* A helper function for __do_global_ctors, which is in crtend.o. Here |
401 | in crtbegin.o, we can reference a couple of symbols not visible there. | |
402 | Plus, since we're before libgcc.a, we have no problems referencing | |
403 | functions from there. */ | |
35a42f5f | 404 | void |
29d2c7a5 | 405 | __do_global_ctors_1(void) |
35a42f5f | 406 | { |
275b60d6 | 407 | #ifdef USE_EH_FRAME_REGISTRY |
35a42f5f | 408 | static struct object object; |
8f08ea1e L |
409 | if (__register_frame_info) |
410 | __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
b335c2cc | 411 | #endif |
6351543d | 412 | #ifdef JCR_SECTION_NAME |
213f974a RH |
413 | if (__JCR_LIST__[0] && _Jv_RegisterClasses) |
414 | _Jv_RegisterClasses (__JCR_LIST__); | |
415 | #endif | |
416 | } | |
4505024e | 417 | #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ |
6351543d | 418 | |
29d2c7a5 RH |
419 | #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ |
420 | #error "What are you doing with crtstuff.c, then?" | |
421 | #endif | |
422 | ||
423 | #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
424 | ||
425 | /* Put a word containing zero at the end of each of our two lists of function | |
426 | addresses. Note that the words defined here go into the .ctors and .dtors | |
427 | sections of the crtend.o file, and since that file is always linked in | |
428 | last, these words naturally end up at the very ends of the two lists | |
429 | contained in these two sections. */ | |
430 | ||
431 | #ifdef CTOR_LIST_END | |
432 | CTOR_LIST_END; | |
433 | #elif defined(CTORS_SECTION_ASM_OP) | |
434 | /* Hack: force cc1 to switch to .data section early, so that assembling | |
435 | __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
436 | static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { }; | |
437 | asm (CTORS_SECTION_ASM_OP); | |
438 | STATIC func_ptr __CTOR_END__[1] | |
439 | __attribute__((aligned(sizeof(func_ptr)))) | |
440 | = { (func_ptr) 0 }; | |
441 | #else | |
442 | STATIC func_ptr __CTOR_END__[1] | |
443 | __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
444 | = { (func_ptr) 0 }; | |
445 | #endif | |
446 | ||
447 | #ifdef DTOR_LIST_END | |
448 | DTOR_LIST_END; | |
449 | #elif defined(DTORS_SECTION_ASM_OP) | |
450 | asm (DTORS_SECTION_ASM_OP); | |
451 | STATIC func_ptr __DTOR_END__[1] | |
452 | __attribute__ ((unused, aligned(sizeof(func_ptr)))) | |
453 | = { (func_ptr) 0 }; | |
454 | #else | |
455 | STATIC func_ptr __DTOR_END__[1] | |
456 | __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr)))) | |
457 | = { (func_ptr) 0 }; | |
458 | #endif | |
dc17e9e9 | 459 | |
29d2c7a5 RH |
460 | #ifdef EH_FRAME_SECTION_NAME |
461 | /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; | |
462 | this would be the 'length' field in a real FDE. */ | |
96d0f4dc | 463 | STATIC EH_FRAME_SECTION_CONST int __FRAME_END__[] |
29d2c7a5 RH |
464 | __attribute__ ((unused, mode(SI), section(EH_FRAME_SECTION_NAME), |
465 | aligned(4))) | |
466 | = { 0 }; | |
f3a8e4f5 | 467 | #endif /* EH_FRAME_SECTION_NAME */ |
29d2c7a5 RH |
468 | |
469 | #ifdef JCR_SECTION_NAME | |
470 | /* Null terminate the .jcr section array. */ | |
471 | STATIC void *__JCR_END__[1] | |
472 | __attribute__ ((unused, section(JCR_SECTION_NAME), | |
473 | aligned(sizeof(void *)))) | |
474 | = { 0 }; | |
475 | #endif /* JCR_SECTION_NAME */ | |
dc17e9e9 RS |
476 | |
477 | #ifdef INIT_SECTION_ASM_OP | |
478 | ||
68d69835 | 479 | #ifdef OBJECT_FORMAT_ELF |
cea3bd3e | 480 | static void __attribute__((used)) |
3cc22c31 | 481 | __do_global_ctors_aux (void) |
68d69835 JM |
482 | { |
483 | func_ptr *p; | |
484 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
485 | (*p) (); | |
486 | } | |
487 | ||
488 | /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
cea3bd3e | 489 | CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux) |
68d69835 JM |
490 | #else /* OBJECT_FORMAT_ELF */ |
491 | ||
492 | /* Stick the real initialization code, followed by a normal sort of | |
493 | function epilogue at the very end of the .init section for this | |
494 | entire root executable file or for this entire shared library file. | |
495 | ||
496 | Note that we use some tricks here to get *just* the body and just | |
497 | a function epilogue (but no function prologue) into the .init | |
9faa82d8 | 498 | section of the crtend.o file. Specifically, we switch to the .text |
68d69835 JM |
499 | section, start to define a function, and then we switch to the .init |
500 | section just before the body code. | |
501 | ||
502 | Earlier on, we put the corresponding function prologue into the .init | |
503 | section of the crtbegin.o file (which will be linked in first). | |
504 | ||
505 | Note that we want to invoke all constructors for C++ file-scope static- | |
506 | storage objects AFTER any other possible initialization actions which | |
507 | may be performed by the code in the .init section contributions made by | |
508 | other libraries, etc. That's because those other initializations may | |
509 | include setup operations for very primitive things (e.g. initializing | |
510 | the state of the floating-point coprocessor, etc.) which should be done | |
0f41302f | 511 | before we start to execute any of the user's code. */ |
dc17e9e9 RS |
512 | |
513 | static void | |
3cc22c31 | 514 | __do_global_ctors_aux (void) /* prologue goes in .text section */ |
dc17e9e9 RS |
515 | { |
516 | asm (INIT_SECTION_ASM_OP); | |
517 | DO_GLOBAL_CTORS_BODY; | |
451fbdf2 | 518 | atexit (__do_global_dtors); |
e5e809f4 JL |
519 | } /* epilogue and body go in .init section */ |
520 | ||
cea3bd3e | 521 | FORCE_CODE_SECTION_ALIGN |
e5e809f4 | 522 | asm (TEXT_SECTION_ASM_OP); |
dc17e9e9 | 523 | |
68d69835 JM |
524 | #endif /* OBJECT_FORMAT_ELF */ |
525 | ||
29d2c7a5 | 526 | #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ |
fe1fd353 JM |
527 | |
528 | /* This case is used by the Irix 6 port, which supports named sections but | |
529 | not an SVR4-style .init section. __do_global_ctors can be non-static | |
0021b564 | 530 | in this case because we protect it with -hidden_symbol. */ |
29d2c7a5 | 531 | extern void __do_global_ctors_1(void); |
fe1fd353 | 532 | void |
3cc22c31 | 533 | __do_global_ctors (void) |
fe1fd353 JM |
534 | { |
535 | func_ptr *p; | |
275b60d6 | 536 | #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) |
29d2c7a5 | 537 | __do_global_ctors_1(); |
0021b564 | 538 | #endif |
fe1fd353 JM |
539 | for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) |
540 | (*p) (); | |
541 | } | |
68d69835 | 542 | |
29d2c7a5 RH |
543 | #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ |
544 | #error "What are you doing with crtstuff.c, then?" | |
b335c2cc | 545 | #endif |
dc17e9e9 | 546 | |
29d2c7a5 RH |
547 | #else /* ! CRT_BEGIN && ! CRT_END */ |
548 | #error "One of CRT_BEGIN or CRT_END must be defined." | |
b335c2cc | 549 | #endif |