gcc/crtstuff.c

   1 /* Specialized bits of code needed to support construction and
   2    destruction of file-scope objects in C++ code.
   3    Copyright (C) 1991, 1994, 1995, 1996, 1997, 1998,
   4    1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   5    Contributed by Ron Guilmette (rfg@monkeys.com).
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 2, or (at your option) any later
  12 version.
  13
  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
  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.
  27
  28 You should have received a copy of the GNU General Public License
  29 along with GCC; see the file COPYING.  If not, write to the Free
  30 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  31 02110-1301, USA.  */
  32
  33 /* This file is a bit like libgcc2.c in that it is compiled
  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
  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.)
  51
  52    This file must be compiled with gcc.  */
  53
  54 /* Target machine header files require this define. */
  55 #define IN_LIBGCC2
  56
  57 /* FIXME: Including auto-host is incorrect, but until we have
  58    identified the set of defines that need to go into auto-target.h,
  59    this will have to do.  */
  60 #include "auto-host.h"
  61 #undef gid_t
  62 #undef pid_t
  63 #undef rlim_t
  64 #undef ssize_t
  65 #undef uid_t
  66 #undef vfork
  67 #include "tconfig.h"
  68 #include "tsystem.h"
  69 #include "coretypes.h"
  70 #include "tm.h"
  71 #include "unwind-dw2-fde.h"
  72
  73 #ifndef FORCE_CODE_SECTION_ALIGN
  74 # define FORCE_CODE_SECTION_ALIGN
  75 #endif
  76
  77 #ifndef CRT_CALL_STATIC_FUNCTION
  78 # define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC)     \
  79 static void __attribute__((__used__))                   \
  80 call_ ## FUNC (void)                                    \
  81 {                                                       \
  82   asm (SECTION_OP);                                     \
  83   FUNC ();                                              \
  84   FORCE_CODE_SECTION_ALIGN                              \
  85   asm (TEXT_SECTION_ASM_OP);                            \
  86 }
  87 #endif
  88
  89 #if defined(OBJECT_FORMAT_ELF) && defined(HAVE_LD_EH_FRAME_HDR) \
  90     && !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
  91     && defined(__GLIBC__) && __GLIBC__ >= 2
  92 #include <link.h>
  93 # if (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
  94      || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
  95 #  define USE_PT_GNU_EH_FRAME
  96 # endif
  97 #endif
  98 #if defined(EH_FRAME_SECTION_NAME) && !defined(USE_PT_GNU_EH_FRAME)
  99 # define USE_EH_FRAME_REGISTRY
 100 #endif
 101 #if defined(EH_FRAME_SECTION_NAME) && EH_TABLES_CAN_BE_READ_ONLY
 102 # define EH_FRAME_SECTION_CONST const
 103 #else
 104 # define EH_FRAME_SECTION_CONST
 105 #endif
 106
 107 /* We do not want to add the weak attribute to the declarations of these
 108    routines in unwind-dw2-fde.h because that will cause the definition of
 109    these symbols to be weak as well.
 110
 111    This exposes a core issue, how to handle creating weak references vs
 112    how to create weak definitions.  Either we have to have the definition
 113    of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
 114    have a second declaration if we want a function's references to be weak,
 115    but not its definition.
 116
 117    Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
 118    one thinks about scaling to larger problems -- i.e., the condition under
 119    which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
 120    complicated.
 121
 122    So, we take an approach similar to #pragma weak -- we have a second
 123    declaration for functions that we want to have weak references.
 124
 125    Neither way is particularly good.  */
 126
 127 /* References to __register_frame_info and __deregister_frame_info should
 128    be weak in this file if at all possible.  */
 129 extern void __register_frame_info (const void *, struct object *)
 130                                   TARGET_ATTRIBUTE_WEAK;
 131 extern void __register_frame_info_bases (const void *, struct object *,
 132                                          void *, void *)
 133                                   TARGET_ATTRIBUTE_WEAK;
 134 extern void *__deregister_frame_info (const void *)
 135                                      TARGET_ATTRIBUTE_WEAK;
 136 extern void *__deregister_frame_info_bases (const void *)
 137                                      TARGET_ATTRIBUTE_WEAK;
 138 extern void __do_global_ctors_1 (void);
 139
 140 /* Likewise for _Jv_RegisterClasses.  */
 141 extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK;
 142
 143 #ifdef OBJECT_FORMAT_ELF
 144
 145 /*  Declare a pointer to void function type.  */
 146 typedef void (*func_ptr) (void);
 147 #define STATIC static
 148
 149 #else  /* OBJECT_FORMAT_ELF */
 150
 151 #include "gbl-ctors.h"
 152
 153 #define STATIC
 154
 155 #endif /* OBJECT_FORMAT_ELF */
 156
 157 #ifdef CRT_BEGIN
 158
 159 /* NOTE:  In order to be able to support SVR4 shared libraries, we arrange
 160    to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
 161    __DTOR_END__ } per root executable and also one set of these symbols
 162    per shared library.  So in any given whole process image, we may have
 163    multiple definitions of each of these symbols.  In order to prevent
 164    these definitions from conflicting with one another, and in order to
 165    ensure that the proper lists are used for the initialization/finalization
 166    of each individual shared library (respectively), we give these symbols
 167    only internal (i.e. `static') linkage, and we also make it a point to
 168    refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
 169    symbol in crtbegin.o, where they are defined.  */
 170
 171 /* The -1 is a flag to __do_global_[cd]tors indicating that this table
 172    does not start with a count of elements.  */
 173 #ifdef CTOR_LIST_BEGIN
 174 CTOR_LIST_BEGIN;
 175 #elif defined(CTORS_SECTION_ASM_OP)
 176 /* Hack: force cc1 to switch to .data section early, so that assembling
 177    __CTOR_LIST__ does not undo our behind-the-back change to .ctors.  */
 178 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
 179 asm (CTORS_SECTION_ASM_OP);
 180 STATIC func_ptr __CTOR_LIST__[1]
 181   __attribute__ ((__unused__, aligned(sizeof(func_ptr))))
 182   = { (func_ptr) (-1) };
 183 #else
 184 STATIC func_ptr __CTOR_LIST__[1]
 185   __attribute__ ((__unused__, section(".ctors"), aligned(sizeof(func_ptr))))
 186   = { (func_ptr) (-1) };
 187 #endif /* __CTOR_LIST__ alternatives */
 188
 189 #ifdef DTOR_LIST_BEGIN
 190 DTOR_LIST_BEGIN;
 191 #elif defined(DTORS_SECTION_ASM_OP)
 192 asm (DTORS_SECTION_ASM_OP);
 193 STATIC func_ptr __DTOR_LIST__[1]
 194   __attribute__ ((aligned(sizeof(func_ptr))))
 195   = { (func_ptr) (-1) };
 196 #else
 197 STATIC func_ptr __DTOR_LIST__[1]
 198   __attribute__((section(".dtors"), aligned(sizeof(func_ptr))))
 199   = { (func_ptr) (-1) };
 200 #endif /* __DTOR_LIST__ alternatives */
 201
 202 #ifdef USE_EH_FRAME_REGISTRY
 203 /* Stick a label at the beginning of the frame unwind info so we can register
 204    and deregister it with the exception handling library code.  */
 205 STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
 206      __attribute__((section(EH_FRAME_SECTION_NAME), aligned(4)))
 207      = { };
 208 #endif /* USE_EH_FRAME_REGISTRY */
 209
 210 #ifdef JCR_SECTION_NAME
 211 /* Stick a label at the beginning of the java class registration info
 212    so we can register them properly.  */
 213 STATIC void *__JCR_LIST__[]
 214   __attribute__ ((unused, section(JCR_SECTION_NAME), aligned(sizeof(void*))))
 215   = { };
 216 #endif /* JCR_SECTION_NAME */
 217
 218 #if defined(INIT_SECTION_ASM_OP) || defined(INIT_ARRAY_SECTION_ASM_OP)
 219
 220 #ifdef OBJECT_FORMAT_ELF
 221
 222 /* Declare the __dso_handle variable.  It should have a unique value
 223    in every shared-object; in a main program its value is zero.  The
 224    object should in any case be protected.  This means the instance
 225    in one DSO or the main program is not used in another object.  The
 226    dynamic linker takes care of this.  */
 227
 228 #ifdef HAVE_GAS_HIDDEN
 229 extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
 230 #endif
 231 #ifdef CRTSTUFFS_O
 232 void *__dso_handle = &__dso_handle;
 233 #else
 234 void *__dso_handle = 0;
 235 #endif
 236
 237 /* The __cxa_finalize function may not be available so we use only a
 238    weak declaration.  */
 239 extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
 240
 241 /* Run all the global destructors on exit from the program.  */
 242
 243 /* Some systems place the number of pointers in the first word of the
 244    table.  On SVR4 however, that word is -1.  In all cases, the table is
 245    null-terminated.  On SVR4, we start from the beginning of the list and
 246    invoke each per-compilation-unit destructor routine in order
 247    until we find that null.
 248
 249    Note that this function MUST be static.  There will be one of these
 250    functions in each root executable and one in each shared library, but
 251    although they all have the same code, each one is unique in that it
 252    refers to one particular associated `__DTOR_LIST__' which belongs to the
 253    same particular root executable or shared library file.
 254
 255    On some systems, this routine is run more than once from the .fini,
 256    when exit is called recursively, so we arrange to remember where in
 257    the list we left off processing, and we resume at that point,
 258    should we be re-invoked.  */
 259
 260 static void __attribute__((used))
 261 __do_global_dtors_aux (void)
 262 {
 263 #ifndef FINI_ARRAY_SECTION_ASM_OP
 264   static func_ptr *p = __DTOR_LIST__ + 1;
 265   func_ptr f;
 266 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP)  */
 267   static _Bool completed;
 268
 269   if (__builtin_expect (completed, 0))
 270     return;
 271
 272 #ifdef CRTSTUFFS_O
 273   if (__cxa_finalize)
 274     __cxa_finalize (__dso_handle);
 275 #endif
 276
 277 #ifdef FINI_ARRAY_SECTION_ASM_OP
 278   /* If we are using .fini_array then destructors will be run via that
 279      mechanism.  */
 280 #else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
 281   while ((f = *p))
 282     {
 283       p++;
 284       f ();
 285     }
 286 #endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
 287
 288 #ifdef USE_EH_FRAME_REGISTRY
 289 #ifdef CRT_GET_RFIB_DATA
 290   /* If we used the new __register_frame_info_bases interface,
 291      make sure that we deregister from the same place.  */
 292   if (__deregister_frame_info_bases)
 293     __deregister_frame_info_bases (__EH_FRAME_BEGIN__);
 294 #else
 295   if (__deregister_frame_info)
 296     __deregister_frame_info (__EH_FRAME_BEGIN__);
 297 #endif
 298 #endif
 299
 300   completed = 1;
 301 }
 302
 303 /* Stick a call to __do_global_dtors_aux into the .fini section.  */
 304 #ifdef FINI_SECTION_ASM_OP
 305 CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
 306 #else /* !defined(FINI_SECTION_ASM_OP) */
 307 static func_ptr __do_global_dtors_aux_fini_array_entry[]
 308   __attribute__ ((__unused__, section(".fini_array")))
 309   = { __do_global_dtors_aux };
 310 #endif /* !defined(FINI_SECTION_ASM_OP) */
 311
 312 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
 313 /* Stick a call to __register_frame_info into the .init section.  For some
 314    reason calls with no arguments work more reliably in .init, so stick the
 315    call in another function.  */
 316
 317 static void __attribute__((used))
 318 frame_dummy (void)
 319 {
 320 #ifdef USE_EH_FRAME_REGISTRY
 321   static struct object object;
 322 #ifdef CRT_GET_RFIB_DATA
 323   void *tbase, *dbase;
 324   tbase = 0;
 325   CRT_GET_RFIB_DATA (dbase);
 326   if (__register_frame_info_bases)
 327     __register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
 328 #else
 329   if (__register_frame_info)
 330     __register_frame_info (__EH_FRAME_BEGIN__, &object);
 331 #endif /* CRT_GET_RFIB_DATA */
 332 #endif /* USE_EH_FRAME_REGISTRY */
 333 #ifdef JCR_SECTION_NAME
 334   if (__JCR_LIST__[0])
 335     {
 336       void (*register_classes) (void *) = _Jv_RegisterClasses;
 337       __asm ("" : "+r" (register_classes));
 338       if (register_classes)
 339         register_classes (__JCR_LIST__);
 340     }
 341 #endif /* JCR_SECTION_NAME */
 342 }
 343
 344 #ifdef INIT_SECTION_ASM_OP
 345 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, frame_dummy)
 346 #else /* defined(INIT_SECTION_ASM_OP) */
 347 static func_ptr __frame_dummy_init_array_entry[]
 348   __attribute__ ((__unused__, section(".init_array")))
 349   = { frame_dummy };
 350 #endif /* !defined(INIT_SECTION_ASM_OP) */
 351 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */
 352
 353 #else  /* OBJECT_FORMAT_ELF */
 354
 355 /* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
 356    and once in crtend.o).  It must be declared static to avoid a link
 357    error.  Here, we define __do_global_ctors as an externally callable
 358    function.  It is externally callable so that __main can invoke it when
 359    INVOKE__main is defined.  This has the additional effect of forcing cc1
 360    to switch to the .text section.  */
 361
 362 static void __do_global_ctors_aux (void);
 363 void
 364 __do_global_ctors (void)
 365 {
 366 #ifdef INVOKE__main
 367   /* If __main won't actually call __do_global_ctors then it doesn't matter
 368      what's inside the function.  The inside of __do_global_ctors_aux is
 369      called automatically in that case.  And the Alliant fx2800 linker
 370      crashes on this reference.  So prevent the crash.  */
 371   __do_global_ctors_aux ();
 372 #endif
 373 }
 374
 375 asm (INIT_SECTION_ASM_OP);      /* cc1 doesn't know that we are switching! */
 376
 377 /* A routine to invoke all of the global constructors upon entry to the
 378    program.  We put this into the .init section (for systems that have
 379    such a thing) so that we can properly perform the construction of
 380    file-scope static-storage C++ objects within shared libraries.  */
 381
 382 static void __attribute__((used))
 383 __do_global_ctors_aux (void)    /* prologue goes in .init section */
 384 {
 385   FORCE_CODE_SECTION_ALIGN      /* explicit align before switch to .text */
 386   asm (TEXT_SECTION_ASM_OP);    /* don't put epilogue and body in .init */
 387   DO_GLOBAL_CTORS_BODY;
 388   atexit (__do_global_dtors);
 389 }
 390
 391 #endif /* OBJECT_FORMAT_ELF */
 392
 393 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
 394
 395 extern void __do_global_dtors (void);
 396
 397 /* This case is used by the Irix 6 port, which supports named sections but
 398    not an SVR4-style .fini section.  __do_global_dtors can be non-static
 399    in this case because we protect it with -hidden_symbol.  */
 400
 401 void
 402 __do_global_dtors (void)
 403 {
 404   func_ptr *p, f;
 405   for (p = __DTOR_LIST__ + 1; (f = *p); p++)
 406     f ();
 407
 408 #ifdef USE_EH_FRAME_REGISTRY
 409   if (__deregister_frame_info)
 410     __deregister_frame_info (__EH_FRAME_BEGIN__);
 411 #endif
 412 }
 413
 414 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
 415 /* A helper function for __do_global_ctors, which is in crtend.o.  Here
 416    in crtbegin.o, we can reference a couple of symbols not visible there.
 417    Plus, since we're before libgcc.a, we have no problems referencing
 418    functions from there.  */
 419 void
 420 __do_global_ctors_1(void)
 421 {
 422 #ifdef USE_EH_FRAME_REGISTRY
 423   static struct object object;
 424   if (__register_frame_info)
 425     __register_frame_info (__EH_FRAME_BEGIN__, &object);
 426 #endif
 427 #ifdef JCR_SECTION_NAME
 428   if (__JCR_LIST__[0])
 429     {
 430       void (*register_classes) (void *) = _Jv_RegisterClasses;
 431       __asm ("" : "+r" (register_classes));
 432       if (register_classes)
 433         register_classes (__JCR_LIST__);
 434     }
 435 #endif
 436 }
 437 #endif /* USE_EH_FRAME_REGISTRY || JCR_SECTION_NAME */
 438
 439 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
 440 #error "What are you doing with crtstuff.c, then?"
 441 #endif
 442
 443 #elif defined(CRT_END) /* ! CRT_BEGIN */
 444
 445 /* Put a word containing zero at the end of each of our two lists of function
 446    addresses.  Note that the words defined here go into the .ctors and .dtors
 447    sections of the crtend.o file, and since that file is always linked in
 448    last, these words naturally end up at the very ends of the two lists
 449    contained in these two sections.  */
 450
 451 #ifdef CTOR_LIST_END
 452 CTOR_LIST_END;
 453 #elif defined(CTORS_SECTION_ASM_OP)
 454 /* Hack: force cc1 to switch to .data section early, so that assembling
 455    __CTOR_LIST__ does not undo our behind-the-back change to .ctors.  */
 456 static func_ptr force_to_data[1] __attribute__ ((__unused__)) = { };
 457 asm (CTORS_SECTION_ASM_OP);
 458 STATIC func_ptr __CTOR_END__[1]
 459   __attribute__((aligned(sizeof(func_ptr))))
 460   = { (func_ptr) 0 };
 461 #else
 462 STATIC func_ptr __CTOR_END__[1]
 463   __attribute__((section(".ctors"), aligned(sizeof(func_ptr))))
 464   = { (func_ptr) 0 };
 465 #endif
 466
 467 #ifdef DTOR_LIST_END
 468 DTOR_LIST_END;
 469 #elif defined(DTORS_SECTION_ASM_OP)
 470 asm (DTORS_SECTION_ASM_OP);
 471 STATIC func_ptr __DTOR_END__[1]
 472   __attribute__ ((unused, aligned(sizeof(func_ptr))))
 473   = { (func_ptr) 0 };
 474 #else
 475 STATIC func_ptr __DTOR_END__[1]
 476   __attribute__((unused, section(".dtors"), aligned(sizeof(func_ptr))))
 477   = { (func_ptr) 0 };
 478 #endif
 479
 480 #ifdef EH_FRAME_SECTION_NAME
 481 /* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
 482    this would be the 'length' field in a real FDE.  */
 483 # if __INT_MAX__ == 2147483647
 484 typedef int int32;
 485 # elif __LONG_MAX__ == 2147483647
 486 typedef long int32;
 487 # elif __SHRT_MAX__ == 2147483647
 488 typedef short int32;
 489 # else
 490 #  error "Missing a 4 byte integer"
 491 # endif
 492 STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[]
 493      __attribute__ ((unused, section(EH_FRAME_SECTION_NAME),
 494                      aligned(sizeof(int32))))
 495      = { 0 };
 496 #endif /* EH_FRAME_SECTION_NAME */
 497
 498 #ifdef JCR_SECTION_NAME
 499 /* Null terminate the .jcr section array.  */
 500 STATIC void *__JCR_END__[1]
 501    __attribute__ ((unused, section(JCR_SECTION_NAME),
 502                    aligned(sizeof(void *))))
 503    = { 0 };
 504 #endif /* JCR_SECTION_NAME */
 505
 506 #ifdef INIT_ARRAY_SECTION_ASM_OP
 507
 508 /* If we are using .init_array, there is nothing to do.  */
 509
 510 #elif defined(INIT_SECTION_ASM_OP)
 511
 512 #ifdef OBJECT_FORMAT_ELF
 513 static void __attribute__((used))
 514 __do_global_ctors_aux (void)
 515 {
 516   func_ptr *p;
 517   for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
 518     (*p) ();
 519 }
 520
 521 /* Stick a call to __do_global_ctors_aux into the .init section.  */
 522 CRT_CALL_STATIC_FUNCTION (INIT_SECTION_ASM_OP, __do_global_ctors_aux)
 523 #else  /* OBJECT_FORMAT_ELF */
 524
 525 /* Stick the real initialization code, followed by a normal sort of
 526    function epilogue at the very end of the .init section for this
 527    entire root executable file or for this entire shared library file.
 528
 529    Note that we use some tricks here to get *just* the body and just
 530    a function epilogue (but no function prologue) into the .init
 531    section of the crtend.o file.  Specifically, we switch to the .text
 532    section, start to define a function, and then we switch to the .init
 533    section just before the body code.
 534
 535    Earlier on, we put the corresponding function prologue into the .init
 536    section of the crtbegin.o file (which will be linked in first).
 537
 538    Note that we want to invoke all constructors for C++ file-scope static-
 539    storage objects AFTER any other possible initialization actions which
 540    may be performed by the code in the .init section contributions made by
 541    other libraries, etc.  That's because those other initializations may
 542    include setup operations for very primitive things (e.g. initializing
 543    the state of the floating-point coprocessor, etc.) which should be done
 544    before we start to execute any of the user's code.  */
 545
 546 static void
 547 __do_global_ctors_aux (void)    /* prologue goes in .text section */
 548 {
 549   asm (INIT_SECTION_ASM_OP);
 550   DO_GLOBAL_CTORS_BODY;
 551   atexit (__do_global_dtors);
 552 }                               /* epilogue and body go in .init section */
 553
 554 FORCE_CODE_SECTION_ALIGN
 555 asm (TEXT_SECTION_ASM_OP);
 556
 557 #endif /* OBJECT_FORMAT_ELF */
 558
 559 #elif defined(HAS_INIT_SECTION) /* ! INIT_SECTION_ASM_OP */
 560
 561 extern void __do_global_ctors (void);
 562
 563 /* This case is used by the Irix 6 port, which supports named sections but
 564    not an SVR4-style .init section.  __do_global_ctors can be non-static
 565    in this case because we protect it with -hidden_symbol.  */
 566 void
 567 __do_global_ctors (void)
 568 {
 569   func_ptr *p;
 570 #if defined(USE_EH_FRAME_REGISTRY) || defined(JCR_SECTION_NAME)
 571   __do_global_ctors_1();
 572 #endif
 573   for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
 574     (*p) ();
 575 }
 576
 577 #else /* ! INIT_SECTION_ASM_OP && ! HAS_INIT_SECTION */
 578 #error "What are you doing with crtstuff.c, then?"
 579 #endif
 580
 581 #else /* ! CRT_BEGIN && ! CRT_END */
 582 #error "One of CRT_BEGIN or CRT_END must be defined."
 583 #endif