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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [crtstuff.c] - Blame information for rev 859

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

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