Mercurial > hg > CbC > CbC_gcc
annotate gcc/crtstuff.c @ 67:f6334be47118
update gcc from gcc-4.6-20100522 to gcc-4.6-20110318
| author | nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp> |
|---|---|
| date | Tue, 22 Mar 2011 17:18:12 +0900 |
| parents | b7f97abdc517 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* Specialized bits of code needed to support construction and |
| 2 destruction of file-scope objects in C++ code. | |
|
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3 Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 |
|
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4 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010 Free Software Foundation, Inc. |
| 0 | 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 pid_t | |
| 57 #undef rlim_t | |
| 58 #undef ssize_t | |
| 59 #undef vfork | |
| 60 #include "tconfig.h" | |
| 61 #include "tsystem.h" | |
| 62 #include "coretypes.h" | |
| 63 #include "tm.h" | |
| 64 #include "unwind-dw2-fde.h" | |
| 65 | |
| 66 #ifndef FORCE_CODE_SECTION_ALIGN | |
| 67 # define FORCE_CODE_SECTION_ALIGN | |
| 68 #endif | |
| 69 | |
| 70 #ifndef CRT_CALL_STATIC_FUNCTION | |
| 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 } | |
| 80 #endif | |
| 81 | |
| 82 #if defined(OBJECT_FORMAT_ELF) \ | |
| 83 && !defined(OBJECT_FORMAT_FLAT) \ | |
| 84 && defined(HAVE_LD_EH_FRAME_HDR) \ | |
| 85 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ | |
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86 && defined(__FreeBSD__) && __FreeBSD__ >= 7 |
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87 #include <link.h> |
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88 # define USE_PT_GNU_EH_FRAME |
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89 #endif |
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90 |
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91 #if defined(OBJECT_FORMAT_ELF) \ |
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92 && !defined(OBJECT_FORMAT_FLAT) \ |
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93 && defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR) \ |
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94 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
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95 && defined(__sun__) && defined(__svr4__) |
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96 #include <link.h> |
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97 # define USE_PT_GNU_EH_FRAME |
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98 #endif |
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99 |
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100 #if defined(OBJECT_FORMAT_ELF) \ |
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101 && !defined(OBJECT_FORMAT_FLAT) \ |
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102 && defined(HAVE_LD_EH_FRAME_HDR) \ |
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103 && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \ |
| 0 | 104 && defined(__GLIBC__) && __GLIBC__ >= 2 |
| 105 #include <link.h> | |
| 106 /* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h. | |
| 107 But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */ | |
| 108 # if !defined(__UCLIBC__) \ | |
| 109 && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \ | |
| 110 || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG))) | |
| 111 # define USE_PT_GNU_EH_FRAME | |
| 112 # endif | |
| 113 #endif | |
| 114 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME) | |
| 115 # define USE_EH_FRAME_REGISTRY | |
| 116 #endif | |
| 117 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY | |
| 118 # define EH_FRAME_SECTION_CONST const | |
| 119 #else | |
| 120 # define EH_FRAME_SECTION_CONST | |
| 121 #endif | |
| 122 | |
| 123 #if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \ | |
| 124 && defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP) | |
| 125 # define HIDDEN_DTOR_LIST_END | |
| 126 #endif | |
| 127 | |
| 128 /* We do not want to add the weak attribute to the declarations of these | |
| 129 routines in unwind-dw2-fde.h because that will cause the definition of | |
| 130 these symbols to be weak as well. | |
| 131 | |
| 132 This exposes a core issue, how to handle creating weak references vs | |
| 133 how to create weak definitions. Either we have to have the definition | |
| 134 of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or | |
| 135 have a second declaration if we want a function's references to be weak, | |
| 136 but not its definition. | |
| 137 | |
| 138 Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until | |
| 139 one thinks about scaling to larger problems -- i.e., the condition under | |
| 140 which TARGET_WEAK_ATTRIBUTE is active will eventually get far too | |
| 141 complicated. | |
| 142 | |
| 143 So, we take an approach similar to #pragma weak -- we have a second | |
| 144 declaration for functions that we want to have weak references. | |
| 145 | |
| 146 Neither way is particularly good. */ | |
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147 |
| 0 | 148 /* References to __register_frame_info and __deregister_frame_info should |
| 149 be weak in this file if at all possible. */ | |
| 150 extern void __register_frame_info (const void *, struct object *) | |
| 151 TARGET_ATTRIBUTE_WEAK; | |
| 152 extern void __register_frame_info_bases (const void *, struct object *, | |
| 153 void *, void *) | |
| 154 TARGET_ATTRIBUTE_WEAK; | |
| 155 extern void *__deregister_frame_info (const void *) | |
| 156 TARGET_ATTRIBUTE_WEAK; | |
| 157 extern void *__deregister_frame_info_bases (const void *) | |
| 158 TARGET_ATTRIBUTE_WEAK; | |
| 159 extern void __do_global_ctors_1 (void); | |
| 160 | |
| 161 /* Likewise for _Jv_RegisterClasses. */ | |
| 162 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK; | |
| 163 | |
| 164 #ifdef OBJECT_FORMAT_ELF | |
| 165 | |
| 166 /* Declare a pointer to void function type. */ | |
| 167 typedef void (*func_ptr) (void); | |
| 168 #define STATIC static | |
| 169 | |
| 170 #else /* OBJECT_FORMAT_ELF */ | |
| 171 | |
| 172 #include "gbl-ctors.h" | |
| 173 | |
| 174 #define STATIC | |
| 175 | |
| 176 #endif /* OBJECT_FORMAT_ELF */ | |
| 177 | |
| 178 #ifdef CRT_BEGIN | |
| 179 | |
| 180 /* NOTE: In order to be able to support SVR4 shared libraries, we arrange | |
| 181 to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__, | |
| 182 __DTOR_END__ } per root executable and also one set of these symbols | |
| 183 per shared library. So in any given whole process image, we may have | |
| 184 multiple definitions of each of these symbols. In order to prevent | |
| 185 these definitions from conflicting with one another, and in order to | |
| 186 ensure that the proper lists are used for the initialization/finalization | |
| 187 of each individual shared library (respectively), we give these symbols | |
| 188 only internal (i.e. `static') linkage, and we also make it a point to | |
| 189 refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__ | |
| 190 symbol in crtbegin.o, where they are defined. */ | |
| 191 | |
| 192 /* The -1 is a flag to __do_global_[cd]tors indicating that this table | |
| 193 does not start with a count of elements. */ | |
| 194 #ifdef CTOR_LIST_BEGIN | |
| 195 CTOR_LIST_BEGIN; | |
| 196 #elif defined(CTORS_SECTION_ASM_OP) | |
| 197 /* Hack: force cc1 to switch to .data section early, so that assembling | |
| 198 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
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199 static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
| 0 | 200 asm (CTORS_SECTION_ASM_OP); |
| 201 STATIC func_ptr __CTOR_LIST__[1] | |
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202 __attribute__ ((__used__, aligned(sizeof(func_ptr)))) |
| 0 | 203 = { (func_ptr) (-1) }; |
| 204 #else | |
| 205 STATIC func_ptr __CTOR_LIST__[1] | |
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206 __attribute__ ((__used__, section(".ctors"), aligned(sizeof(func_ptr)))) |
| 0 | 207 = { (func_ptr) (-1) }; |
| 208 #endif /* __CTOR_LIST__ alternatives */ | |
| 209 | |
| 210 #ifdef DTOR_LIST_BEGIN | |
| 211 DTOR_LIST_BEGIN; | |
| 212 #elif defined(DTORS_SECTION_ASM_OP) | |
| 213 asm (DTORS_SECTION_ASM_OP); | |
| 214 STATIC func_ptr __DTOR_LIST__[1] | |
| 215 __attribute__ ((aligned(sizeof(func_ptr)))) | |
| 216 = { (func_ptr) (-1) }; | |
| 217 #else | |
| 218 STATIC func_ptr __DTOR_LIST__[1] | |
| 219 __attribute__((section(".dtors"), aligned(sizeof(func_ptr)))) | |
| 220 = { (func_ptr) (-1) }; | |
| 221 #endif /* __DTOR_LIST__ alternatives */ | |
| 222 | |
| 223 #ifdef USE_EH_FRAME_REGISTRY | |
| 224 /* Stick a label at the beginning of the frame unwind info so we can register | |
| 225 and deregister it with the exception handling library code. */ | |
| 226 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[] | |
| 227 __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4))) | |
| 228 = { }; | |
| 229 #endif /* USE_EH_FRAME_REGISTRY */ | |
| 230 | |
| 231 #ifdef JCR_SECTION_NAME | |
| 232 /* Stick a label at the beginning of the java class registration info | |
| 233 so we can register them properly. */ | |
| 234 STATIC void *__JCR_LIST__[] | |
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235 __attribute__ ((used, section(JCR_SECTION_NAME), aligned(sizeof(void*)))) |
| 0 | 236 = { }; |
| 237 #endif /* JCR_SECTION_NAME */ | |
| 238 | |
| 239 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP) | |
| 240 | |
| 241 #ifdef OBJECT_FORMAT_ELF | |
| 242 | |
| 243 /* Declare the __dso_handle variable. It should have a unique value | |
| 244 in every shared-object; in a main program its value is zero. The | |
| 245 object should in any case be protected. This means the instance | |
| 246 in one DSO or the main program is not used in another object. The | |
| 247 dynamic linker takes care of this. */ | |
| 248 | |
| 249 #ifdef TARGET_LIBGCC_SDATA_SECTION | |
| 250 extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION))); | |
| 251 #endif | |
| 252 #ifdef HAVE_GAS_HIDDEN | |
| 253 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden"))); | |
| 254 #endif | |
| 255 #ifdef CRTSTUFFS_O | |
| 256 void *__dso_handle = &__dso_handle; | |
| 257 #else | |
| 258 void *__dso_handle = 0; | |
| 259 #endif | |
| 260 | |
| 261 /* The __cxa_finalize function may not be available so we use only a | |
| 262 weak declaration. */ | |
| 263 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK; | |
| 264 | |
| 265 /* Run all the global destructors on exit from the program. */ | |
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266 |
| 0 | 267 /* Some systems place the number of pointers in the first word of the |
| 268 table. On SVR4 however, that word is -1. In all cases, the table is | |
| 269 null-terminated. On SVR4, we start from the beginning of the list and | |
| 270 invoke each per-compilation-unit destructor routine in order | |
| 271 until we find that null. | |
| 272 | |
| 273 Note that this function MUST be static. There will be one of these | |
| 274 functions in each root executable and one in each shared library, but | |
| 275 although they all have the same code, each one is unique in that it | |
| 276 refers to one particular associated `__DTOR_LIST__' which belongs to the | |
| 277 same particular root executable or shared library file. | |
| 278 | |
| 279 On some systems, this routine is run more than once from the .fini, | |
| 280 when exit is called recursively, so we arrange to remember where in | |
| 281 the list we left off processing, and we resume at that point, | |
| 282 should we be re-invoked. */ | |
| 283 | |
| 284 static void __attribute__((used)) | |
| 285 __do_global_dtors_aux (void) | |
| 286 { | |
| 287 static _Bool completed; | |
| 288 | |
| 289 if (__builtin_expect (completed, 0)) | |
| 290 return; | |
| 291 | |
| 292 #ifdef CRTSTUFFS_O | |
| 293 if (__cxa_finalize) | |
| 294 __cxa_finalize (__dso_handle); | |
| 295 #endif | |
| 296 | |
| 297 #ifdef FINI_ARRAY_SECTION_ASM_OP | |
| 298 /* If we are using .fini_array then destructors will be run via that | |
| 299 mechanism. */ | |
| 300 #elif defined(HIDDEN_DTOR_LIST_END) | |
| 301 { | |
| 302 /* Safer version that makes sure only .dtors function pointers are | |
| 303 called even if the static variable is maliciously changed. */ | |
| 304 extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden"))); | |
| 305 static size_t dtor_idx; | |
| 306 const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1; | |
| 307 func_ptr f; | |
| 308 | |
| 309 while (dtor_idx < max_idx) | |
| 310 { | |
| 311 f = __DTOR_LIST__[++dtor_idx]; | |
| 312 f (); | |
| 313 } | |
| 314 } | |
| 315 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */ | |
| 316 { | |
| 317 static func_ptr *p = __DTOR_LIST__ + 1; | |
| 318 func_ptr f; | |
| 319 | |
| 320 while ((f = *p)) | |
| 321 { | |
| 322 p++; | |
| 323 f (); | |
| 324 } | |
| 325 } | |
| 326 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */ | |
| 327 | |
| 328 #ifdef USE_EH_FRAME_REGISTRY | |
| 329 #ifdef CRT_GET_RFIB_DATA | |
| 330 /* If we used the new __register_frame_info_bases interface, | |
| 331 make sure that we deregister from the same place. */ | |
| 332 if (__deregister_frame_info_bases) | |
| 333 __deregister_frame_info_bases (__EH_FRAME_BEGIN__); | |
| 334 #else | |
| 335 if (__deregister_frame_info) | |
| 336 __deregister_frame_info (__EH_FRAME_BEGIN__); | |
| 337 #endif | |
| 338 #endif | |
| 339 | |
| 340 completed = 1; | |
| 341 } | |
| 342 | |
| 343 /* Stick a call to __do_global_dtors_aux into the .fini section. */ | |
| 344 #ifdef FINI_SECTION_ASM_OP | |
| 345 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux) | |
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346 #elif defined (FINI_ARRAY_SECTION_ASM_OP) |
| 0 | 347 static func_ptr __do_global_dtors_aux_fini_array_entry[] |
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348 __attribute__ ((__used__, section(".fini_array"))) |
| 0 | 349 = { __do_global_dtors_aux }; |
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350 #else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */ |
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351 static void __attribute__((used)) |
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352 __do_global_dtors_aux_1 (void) |
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353 { |
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354 atexit (__do_global_dtors_aux); |
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355 } |
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356 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_dtors_aux_1) |
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357 #endif |
| 0 | 358 |
| 359 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
| 360 /* Stick a call to __register_frame_info into the .init section. For some | |
| 361 reason calls with no arguments work more reliably in .init, so stick the | |
| 362 call in another function. */ | |
| 363 | |
| 364 static void __attribute__((used)) | |
| 365 frame_dummy (void) | |
| 366 { | |
| 367 #ifdef USE_EH_FRAME_REGISTRY | |
| 368 static struct object object; | |
| 369 #ifdef CRT_GET_RFIB_DATA | |
| 370 void *tbase, *dbase; | |
| 371 tbase = 0; | |
| 372 CRT_GET_RFIB_DATA (dbase); | |
| 373 if (__register_frame_info_bases) | |
| 374 __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase); | |
| 375 #else | |
| 376 if (__register_frame_info) | |
| 377 __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
| 378 #endif /* CRT_GET_RFIB_DATA */ | |
| 379 #endif /* USE_EH_FRAME_REGISTRY */ | |
| 380 #ifdef JCR_SECTION_NAME | |
| 381 if (__JCR_LIST__[0]) | |
| 382 { | |
| 383 void (*register_classes) (void *) = _Jv_RegisterClasses; | |
| 384 __asm ("" : "+r" (register_classes)); | |
| 385 if (register_classes) | |
| 386 register_classes (__JCR_LIST__); | |
| 387 } | |
| 388 #endif /* JCR_SECTION_NAME */ | |
| 389 } | |
| 390 | |
| 391 #ifdef INIT_SECTION_ASM_OP | |
| 392 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy) | |
| 393 #else /* defined(INIT_SECTION_ASM_OP) */ | |
| 394 static func_ptr __frame_dummy_init_array_entry[] | |
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395 __attribute__ ((__used__, section(".init_array"))) |
| 0 | 396 = { frame_dummy }; |
| 397 #endif /* !defined(INIT_SECTION_ASM_OP) */ | |
| 398 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ | |
| 399 | |
| 400 #else /* OBJECT_FORMAT_ELF */ | |
| 401 | |
| 402 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o | |
| 403 and once in crtend.o). It must be declared static to avoid a link | |
| 404 error. Here, we define __do_global_ctors as an externally callable | |
| 405 function. It is externally callable so that __main can invoke it when | |
| 406 INVOKE__main is defined. This has the additional effect of forcing cc1 | |
| 407 to switch to the .text section. */ | |
| 408 | |
| 409 static void __do_global_ctors_aux (void); | |
| 410 void | |
| 411 __do_global_ctors (void) | |
| 412 { | |
| 413 #ifdef INVOKE__main | |
| 414 /* If __main won't actually call __do_global_ctors then it doesn't matter | |
| 415 what's inside the function. The inside of __do_global_ctors_aux is | |
| 416 called automatically in that case. And the Alliant fx2800 linker | |
| 417 crashes on this reference. So prevent the crash. */ | |
| 418 __do_global_ctors_aux (); | |
| 419 #endif | |
| 420 } | |
| 421 | |
| 422 asm (INIT_SECTION_ASM_OP); /* cc1 doesn't know that we are switching! */ | |
| 423 | |
| 424 /* A routine to invoke all of the global constructors upon entry to the | |
| 425 program. We put this into the .init section (for systems that have | |
| 426 such a thing) so that we can properly perform the construction of | |
| 427 file-scope static-storage C++ objects within shared libraries. */ | |
| 428 | |
| 429 static void __attribute__((used)) | |
| 430 __do_global_ctors_aux (void) /* prologue goes in .init section */ | |
| 431 { | |
| 432 FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */ | |
| 433 asm (TEXT_SECTION_ASM_OP); /* don't put epilogue and body in .init */ | |
| 434 DO_GLOBAL_CTORS_BODY; | |
| 435 atexit (__do_global_dtors); | |
| 436 } | |
| 437 | |
| 438 #endif /* OBJECT_FORMAT_ELF */ | |
| 439 | |
| 440 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ | |
| 441 | |
| 442 extern void __do_global_dtors (void); | |
| 443 | |
| 444 /* This case is used by the Irix 6 port, which supports named sections but | |
| 445 not an SVR4-style .fini section. __do_global_dtors can be non-static | |
| 446 in this case because we protect it with -hidden_symbol. */ | |
| 447 | |
| 448 void | |
| 449 __do_global_dtors (void) | |
| 450 { | |
| 451 func_ptr *p, f; | |
| 452 for (p = __DTOR_LIST__ + 1; (f = *p); p++) | |
| 453 f (); | |
| 454 | |
| 455 #ifdef USE_EH_FRAME_REGISTRY | |
| 456 if (__deregister_frame_info) | |
| 457 __deregister_frame_info (__EH_FRAME_BEGIN__); | |
| 458 #endif | |
| 459 } | |
| 460 | |
| 461 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
| 462 /* A helper function for __do_global_ctors, which is in crtend.o. Here | |
| 463 in crtbegin.o, we can reference a couple of symbols not visible there. | |
| 464 Plus, since we're before libgcc.a, we have no problems referencing | |
| 465 functions from there. */ | |
| 466 void | |
| 467 __do_global_ctors_1(void) | |
| 468 { | |
| 469 #ifdef USE_EH_FRAME_REGISTRY | |
| 470 static struct object object; | |
| 471 if (__register_frame_info) | |
| 472 __register_frame_info (__EH_FRAME_BEGIN__, &object); | |
| 473 #endif | |
| 474 #ifdef JCR_SECTION_NAME | |
| 475 if (__JCR_LIST__[0]) | |
| 476 { | |
| 477 void (*register_classes) (void *) = _Jv_RegisterClasses; | |
| 478 __asm ("" : "+r" (register_classes)); | |
| 479 if (register_classes) | |
| 480 register_classes (__JCR_LIST__); | |
| 481 } | |
| 482 #endif | |
| 483 } | |
| 484 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */ | |
| 485 | |
| 486 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ | |
| 487 #error "What are you doing with crtstuff.c, then?" | |
| 488 #endif | |
| 489 | |
| 490 #elif defined(CRT_END) /* ! CRT_BEGIN */ | |
| 491 | |
| 492 /* Put a word containing zero at the end of each of our two lists of function | |
| 493 addresses. Note that the words defined here go into the .ctors and .dtors | |
| 494 sections of the crtend.o file, and since that file is always linked in | |
| 495 last, these words naturally end up at the very ends of the two lists | |
| 496 contained in these two sections. */ | |
| 497 | |
| 498 #ifdef CTOR_LIST_END | |
| 499 CTOR_LIST_END; | |
| 500 #elif defined(CTORS_SECTION_ASM_OP) | |
| 501 /* Hack: force cc1 to switch to .data section early, so that assembling | |
| 502 __CTOR_LIST__ does not undo our behind-the-back change to .ctors. */ | |
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503 static func_ptr force_to_data[1] __attribute__ ((__used__)) = { }; |
| 0 | 504 asm (CTORS_SECTION_ASM_OP); |
| 505 STATIC func_ptr __CTOR_END__[1] | |
| 506 __attribute__((aligned(sizeof(func_ptr)))) | |
| 507 = { (func_ptr) 0 }; | |
| 508 #else | |
| 509 STATIC func_ptr __CTOR_END__[1] | |
| 510 __attribute__((section(".ctors"), aligned(sizeof(func_ptr)))) | |
| 511 = { (func_ptr) 0 }; | |
| 512 #endif | |
| 513 | |
| 514 #ifdef DTOR_LIST_END | |
| 515 DTOR_LIST_END; | |
| 516 #elif defined(HIDDEN_DTOR_LIST_END) | |
| 517 #ifdef DTORS_SECTION_ASM_OP | |
| 518 asm (DTORS_SECTION_ASM_OP); | |
| 519 #endif | |
| 520 func_ptr __DTOR_END__[1] | |
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521 __attribute__ ((used, |
| 0 | 522 #ifndef DTORS_SECTION_ASM_OP |
| 523 section(".dtors"), | |
| 524 #endif | |
| 525 aligned(sizeof(func_ptr)), visibility ("hidden"))) | |
| 526 = { (func_ptr) 0 }; | |
| 527 #elif defined(DTORS_SECTION_ASM_OP) | |
| 528 asm (DTORS_SECTION_ASM_OP); | |
| 529 STATIC func_ptr __DTOR_END__[1] | |
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530 __attribute__ ((used, aligned(sizeof(func_ptr)))) |
| 0 | 531 = { (func_ptr) 0 }; |
| 532 #else | |
| 533 STATIC func_ptr __DTOR_END__[1] | |
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534 __attribute__((used, section(".dtors"), aligned(sizeof(func_ptr)))) |
| 0 | 535 = { (func_ptr) 0 }; |
| 536 #endif | |
| 537 | |
| 538 #ifdef EH_FRAME_SECTION_NAME | |
| 539 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel; | |
| 540 this would be the 'length' field in a real FDE. */ | |
| 541 # if __INT_MAX__ == 2147483647 | |
| 542 typedef int int32; | |
| 543 # elif __LONG_MAX__ == 2147483647 | |
| 544 typedef long int32; | |
| 545 # elif __SHRT_MAX__ == 2147483647 | |
| 546 typedef short int32; | |
| 547 # else | |
| 548 # error "Missing a 4 byte integer" | |
| 549 # endif | |
| 550 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[] | |
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551 __attribute__ ((used, section(EH_FRAME_SECTION_NAME), |
| 0 | 552 aligned(sizeof(int32)))) |
| 553 = { 0 }; | |
| 554 #endif /* EH_FRAME_SECTION_NAME */ | |
| 555 | |
| 556 #ifdef JCR_SECTION_NAME | |
| 557 /* Null terminate the .jcr section array. */ | |
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558 STATIC void *__JCR_END__[1] |
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559 __attribute__ ((used, section(JCR_SECTION_NAME), |
| 0 | 560 aligned(sizeof(void *)))) |
| 561 = { 0 }; | |
| 562 #endif /* JCR_SECTION_NAME */ | |
| 563 | |
| 564 #ifdef INIT_ARRAY_SECTION_ASM_OP | |
| 565 | |
| 566 /* If we are using .init_array, there is nothing to do. */ | |
| 567 | |
| 568 #elif defined(INIT_SECTION_ASM_OP) | |
| 569 | |
| 570 #ifdef OBJECT_FORMAT_ELF | |
| 571 static void __attribute__((used)) | |
| 572 __do_global_ctors_aux (void) | |
| 573 { | |
| 574 func_ptr *p; | |
| 575 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
| 576 (*p) (); | |
| 577 } | |
| 578 | |
| 579 /* Stick a call to __do_global_ctors_aux into the .init section. */ | |
| 580 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux) | |
| 581 #else /* OBJECT_FORMAT_ELF */ | |
| 582 | |
| 583 /* Stick the real initialization code, followed by a normal sort of | |
| 584 function epilogue at the very end of the .init section for this | |
| 585 entire root executable file or for this entire shared library file. | |
| 586 | |
| 587 Note that we use some tricks here to get *just* the body and just | |
| 588 a function epilogue (but no function prologue) into the .init | |
| 589 section of the crtend.o file. Specifically, we switch to the .text | |
| 590 section, start to define a function, and then we switch to the .init | |
| 591 section just before the body code. | |
| 592 | |
| 593 Earlier on, we put the corresponding function prologue into the .init | |
| 594 section of the crtbegin.o file (which will be linked in first). | |
| 595 | |
| 596 Note that we want to invoke all constructors for C++ file-scope static- | |
| 597 storage objects AFTER any other possible initialization actions which | |
| 598 may be performed by the code in the .init section contributions made by | |
| 599 other libraries, etc. That's because those other initializations may | |
| 600 include setup operations for very primitive things (e.g. initializing | |
| 601 the state of the floating-point coprocessor, etc.) which should be done | |
| 602 before we start to execute any of the user's code. */ | |
| 603 | |
| 604 static void | |
| 605 __do_global_ctors_aux (void) /* prologue goes in .text section */ | |
| 606 { | |
| 607 asm (INIT_SECTION_ASM_OP); | |
| 608 DO_GLOBAL_CTORS_BODY; | |
| 609 atexit (__do_global_dtors); | |
| 610 } /* epilogue and body go in .init section */ | |
| 611 | |
| 612 FORCE_CODE_SECTION_ALIGN | |
| 613 asm (TEXT_SECTION_ASM_OP); | |
| 614 | |
| 615 #endif /* OBJECT_FORMAT_ELF */ | |
| 616 | |
| 617 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */ | |
| 618 | |
| 619 extern void __do_global_ctors (void); | |
| 620 | |
| 621 /* This case is used by the Irix 6 port, which supports named sections but | |
| 622 not an SVR4-style .init section. __do_global_ctors can be non-static | |
| 623 in this case because we protect it with -hidden_symbol. */ | |
| 624 void | |
| 625 __do_global_ctors (void) | |
| 626 { | |
| 627 func_ptr *p; | |
| 628 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME) | |
| 629 __do_global_ctors_1(); | |
| 630 #endif | |
| 631 for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--) | |
| 632 (*p) (); | |
| 633 } | |
| 634 | |
| 635 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */ | |
| 636 #error "What are you doing with crtstuff.c, then?" | |
| 637 #endif | |
| 638 | |
| 639 #else /* ! CRT_BEGIN && ! CRT_END */ | |
| 640 #error "One of CRT_BEGIN or CRT_END must be defined." | |
| 641 #endif |