1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
|
/* Specialized bits of code needed to support construction and
destruction of file-scope objects in C++ code.
Copyright (C) 1991-2014 Free Software Foundation, Inc.
Contributed by Ron Guilmette (rfg@monkeys.com).
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
/* This file is a bit like libgcc2.c in that it is compiled
multiple times and yields multiple .o files.
This file is useful on target machines where the object file format
supports multiple "user-defined" sections (e.g. COFF, ELF, ROSE). On
such systems, this file allows us to avoid running collect (or any
other such slow and painful kludge). Additionally, if the target
system supports a .init section, this file allows us to support the
linking of C++ code with a non-C++ main program.
Note that if INIT_SECTION_ASM_OP is defined in the tm.h file, then
this file *will* make use of the .init section. If that symbol is
not defined however, then the .init section will not be used.
Currently, only ELF and COFF are supported. It is likely however that
ROSE could also be supported, if someone was willing to do the work to
make whatever (small?) adaptations are needed. (Some work may be
needed on the ROSE assembler and linker also.)
This file must be compiled with gcc. */
/* Target machine header files require this define. */
#define IN_LIBGCC2
/* FIXME: Including auto-host is incorrect, but until we have
identified the set of defines that need to go into auto-target.h,
this will have to do. */
#include "auto-host.h"
#undef caddr_t
#undef pid_t
#undef rlim_t
#undef ssize_t
#undef vfork
#include "tconfig.h"
#include "tsystem.h"
#include "coretypes.h"
#include "tm.h"
#include "libgcc_tm.h"
#include "unwind-dw2-fde.h"
#ifndef FORCE_CODE_SECTION_ALIGN
# define FORCE_CODE_SECTION_ALIGN
#endif
#ifndef CRT_CALL_STATIC_FUNCTION
# define CRT_CALL_STATIC_FUNCTION(SECTION_OP, FUNC) \
static void __attribute__((__used__)) \
call_ ## FUNC (void) \
{ \
asm (SECTION_OP); \
FUNC (); \
FORCE_CODE_SECTION_ALIGN \
asm (__LIBGCC_TEXT_SECTION_ASM_OP__); \
}
#endif
#if defined(TARGET_DL_ITERATE_PHDR) && \
(defined(__DragonFly__) || defined(__FreeBSD__))
#define BSD_DL_ITERATE_PHDR_AVAILABLE
#endif
#if defined(OBJECT_FORMAT_ELF) \
&& !defined(OBJECT_FORMAT_FLAT) \
&& defined(HAVE_LD_EH_FRAME_HDR) \
&& !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
&& defined(BSD_DL_ITERATE_PHDR_AVAILABLE)
#include <link.h>
# define USE_PT_GNU_EH_FRAME
#endif
#if defined(OBJECT_FORMAT_ELF) \
&& !defined(OBJECT_FORMAT_FLAT) \
&& defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR) \
&& !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
&& defined(__sun__) && defined(__svr4__)
#include <link.h>
# define USE_PT_GNU_EH_FRAME
#endif
#if defined(OBJECT_FORMAT_ELF) \
&& !defined(OBJECT_FORMAT_FLAT) \
&& defined(HAVE_LD_EH_FRAME_HDR) \
&& !defined(inhibit_libc) && !defined(CRTSTUFFT_O) \
&& defined(__GLIBC__) && __GLIBC__ >= 2
#include <link.h>
/* uClibc pretends to be glibc 2.2 and DT_CONFIG is defined in its link.h.
But it doesn't use PT_GNU_EH_FRAME ELF segment currently. */
# if !defined(__UCLIBC__) \
&& (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
|| (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
# define USE_PT_GNU_EH_FRAME
# endif
#endif
#if defined(OBJECT_FORMAT_ELF) \
&& !defined(OBJECT_FORMAT_FLAT) \
&& defined(HAVE_LD_EH_FRAME_HDR) \
&& !defined(CRTSTUFFT_O) \
&& defined(inhibit_libc) \
&& (defined(__GLIBC__) || defined(__gnu_linux__) || defined(__GNU__))
/* On systems using glibc, an inhibit_libc build of libgcc is only
part of a bootstrap process. Build the same crt*.o as would be
built with headers present, so that it is not necessary to build
glibc more than once for the bootstrap to converge. */
# define USE_PT_GNU_EH_FRAME
#endif
#if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) && !defined(USE_PT_GNU_EH_FRAME)
# define USE_EH_FRAME_REGISTRY
#endif
#if defined(__LIBGCC_EH_FRAME_SECTION_NAME__) \
&& __LIBGCC_EH_TABLES_CAN_BE_READ_ONLY__
# define EH_FRAME_SECTION_CONST const
#else
# define EH_FRAME_SECTION_CONST
#endif
#if !defined(DTOR_LIST_END) && defined(OBJECT_FORMAT_ELF) \
&& defined(HAVE_GAS_HIDDEN) && !defined(FINI_ARRAY_SECTION_ASM_OP)
# define HIDDEN_DTOR_LIST_END
#endif
#if !defined(USE_TM_CLONE_REGISTRY) && defined(OBJECT_FORMAT_ELF)
# define USE_TM_CLONE_REGISTRY 1
#endif
/* We do not want to add the weak attribute to the declarations of these
routines in unwind-dw2-fde.h because that will cause the definition of
these symbols to be weak as well.
This exposes a core issue, how to handle creating weak references vs
how to create weak definitions. Either we have to have the definition
of TARGET_WEAK_ATTRIBUTE be conditional in the shared header files or
have a second declaration if we want a function's references to be weak,
but not its definition.
Making TARGET_WEAK_ATTRIBUTE conditional seems like a good solution until
one thinks about scaling to larger problems -- i.e., the condition under
which TARGET_WEAK_ATTRIBUTE is active will eventually get far too
complicated.
So, we take an approach similar to #pragma weak -- we have a second
declaration for functions that we want to have weak references.
Neither way is particularly good. */
/* References to __register_frame_info and __deregister_frame_info should
be weak in this file if at all possible. */
extern void __register_frame_info (const void *, struct object *)
TARGET_ATTRIBUTE_WEAK;
extern void __register_frame_info_bases (const void *, struct object *,
void *, void *)
TARGET_ATTRIBUTE_WEAK;
extern void *__deregister_frame_info (const void *)
TARGET_ATTRIBUTE_WEAK;
extern void *__deregister_frame_info_bases (const void *)
TARGET_ATTRIBUTE_WEAK;
extern void __do_global_ctors_1 (void);
/* Likewise for _Jv_RegisterClasses. */
extern void _Jv_RegisterClasses (void *) TARGET_ATTRIBUTE_WEAK;
/* Likewise for transactional memory clone tables. */
extern void _ITM_registerTMCloneTable (void *, size_t) TARGET_ATTRIBUTE_WEAK;
extern void _ITM_deregisterTMCloneTable (void *) TARGET_ATTRIBUTE_WEAK;
#ifdef OBJECT_FORMAT_ELF
/* Declare a pointer to void function type. */
typedef void (*func_ptr) (void);
#define STATIC static
#else /* OBJECT_FORMAT_ELF */
#include "gbl-ctors.h"
#define STATIC
#endif /* OBJECT_FORMAT_ELF */
#ifdef CRT_BEGIN
/* NOTE: In order to be able to support SVR4 shared libraries, we arrange
to have one set of symbols { __CTOR_LIST__, __DTOR_LIST__, __CTOR_END__,
__DTOR_END__ } per root executable and also one set of these symbols
per shared library. So in any given whole process image, we may have
multiple definitions of each of these symbols. In order to prevent
these definitions from conflicting with one another, and in order to
ensure that the proper lists are used for the initialization/finalization
of each individual shared library (respectively), we give these symbols
only internal (i.e. `static') linkage, and we also make it a point to
refer to only the __CTOR_END__ symbol in crtend.o and the __DTOR_LIST__
symbol in crtbegin.o, where they are defined. */
/* No need for .ctors/.dtors section if linker can place them in
.init_array/.fini_array section. */
#ifndef USE_INITFINI_ARRAY
/* The -1 is a flag to __do_global_[cd]tors indicating that this table
does not start with a count of elements. */
#ifdef CTOR_LIST_BEGIN
CTOR_LIST_BEGIN;
#elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__)
/* Hack: force cc1 to switch to .data section early, so that assembling
__CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
static func_ptr force_to_data[1] __attribute__ ((__used__)) = { };
asm (__LIBGCC_CTORS_SECTION_ASM_OP__);
STATIC func_ptr __CTOR_LIST__[1]
__attribute__ ((__used__, aligned(sizeof(func_ptr))))
= { (func_ptr) (-1) };
#else
STATIC func_ptr __CTOR_LIST__[1]
__attribute__ ((__used__, section(".ctors"), aligned(sizeof(func_ptr))))
= { (func_ptr) (-1) };
#endif /* __CTOR_LIST__ alternatives */
#ifdef DTOR_LIST_BEGIN
DTOR_LIST_BEGIN;
#elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__)
asm (__LIBGCC_DTORS_SECTION_ASM_OP__);
STATIC func_ptr __DTOR_LIST__[1]
__attribute__ ((aligned(sizeof(func_ptr))))
= { (func_ptr) (-1) };
#else
STATIC func_ptr __DTOR_LIST__[1]
__attribute__((section(".dtors"), aligned(sizeof(func_ptr))))
= { (func_ptr) (-1) };
#endif /* __DTOR_LIST__ alternatives */
#endif /* USE_INITFINI_ARRAY */
#ifdef USE_EH_FRAME_REGISTRY
/* Stick a label at the beginning of the frame unwind info so we can register
and deregister it with the exception handling library code. */
STATIC EH_FRAME_SECTION_CONST char __EH_FRAME_BEGIN__[]
__attribute__((section(__LIBGCC_EH_FRAME_SECTION_NAME__), aligned(4)))
= { };
#endif /* USE_EH_FRAME_REGISTRY */
#ifdef __LIBGCC_JCR_SECTION_NAME__
/* Stick a label at the beginning of the java class registration info
so we can register them properly. */
STATIC void *__JCR_LIST__[]
__attribute__ ((used, section(__LIBGCC_JCR_SECTION_NAME__),
aligned(sizeof(void*))))
= { };
#endif /* __LIBGCC_JCR_SECTION_NAME__ */
#if USE_TM_CLONE_REGISTRY
STATIC func_ptr __TMC_LIST__[]
__attribute__((used, section(".tm_clone_table"), aligned(sizeof(void*))))
= { };
# ifdef HAVE_GAS_HIDDEN
extern func_ptr __TMC_END__[] __attribute__((__visibility__ ("hidden")));
# endif
static inline void
deregister_tm_clones (void)
{
void (*fn) (void *);
#ifdef HAVE_GAS_HIDDEN
if (__TMC_END__ - __TMC_LIST__ == 0)
return;
#else
if (__TMC_LIST__[0] == NULL)
return;
#endif
fn = _ITM_deregisterTMCloneTable;
__asm ("" : "+r" (fn));
if (fn)
fn (__TMC_LIST__);
}
static inline void
register_tm_clones (void)
{
void (*fn) (void *, size_t);
size_t size;
#ifdef HAVE_GAS_HIDDEN
size = (__TMC_END__ - __TMC_LIST__) / 2;
#else
for (size = 0; __TMC_LIST__[size * 2] != NULL; size++)
continue;
#endif
if (size == 0)
return;
fn = _ITM_registerTMCloneTable;
__asm ("" : "+r" (fn));
if (fn)
fn (__TMC_LIST__, size);
}
#endif /* USE_TM_CLONE_REGISTRY */
#if defined(__LIBGCC_INIT_SECTION_ASM_OP__) \
|| defined(__LIBGCC_INIT_ARRAY_SECTION_ASM_OP__)
#ifdef OBJECT_FORMAT_ELF
/* Declare the __dso_handle variable. It should have a unique value
in every shared-object; in a main program its value is zero. The
object should in any case be protected. This means the instance
in one DSO or the main program is not used in another object. The
dynamic linker takes care of this. */
#ifdef TARGET_LIBGCC_SDATA_SECTION
extern void *__dso_handle __attribute__ ((__section__ (TARGET_LIBGCC_SDATA_SECTION)));
#endif
#ifdef HAVE_GAS_HIDDEN
extern void *__dso_handle __attribute__ ((__visibility__ ("hidden")));
#endif
#ifdef CRTSTUFFS_O
void *__dso_handle = &__dso_handle;
#else
void *__dso_handle = 0;
#endif
/* The __cxa_finalize function may not be available so we use only a
weak declaration. */
extern void __cxa_finalize (void *) TARGET_ATTRIBUTE_WEAK;
/* Run all the global destructors on exit from the program. */
/* Some systems place the number of pointers in the first word of the
table. On SVR4 however, that word is -1. In all cases, the table is
null-terminated. On SVR4, we start from the beginning of the list and
invoke each per-compilation-unit destructor routine in order
until we find that null.
Note that this function MUST be static. There will be one of these
functions in each root executable and one in each shared library, but
although they all have the same code, each one is unique in that it
refers to one particular associated `__DTOR_LIST__' which belongs to the
same particular root executable or shared library file.
On some systems, this routine is run more than once from the .fini,
when exit is called recursively, so we arrange to remember where in
the list we left off processing, and we resume at that point,
should we be re-invoked. */
static void __attribute__((used))
__do_global_dtors_aux (void)
{
static _Bool completed;
if (__builtin_expect (completed, 0))
return;
#ifdef CRTSTUFFS_O
if (__cxa_finalize)
__cxa_finalize (__dso_handle);
#endif
#ifdef FINI_ARRAY_SECTION_ASM_OP
/* If we are using .fini_array then destructors will be run via that
mechanism. */
#elif defined(HIDDEN_DTOR_LIST_END)
{
/* Safer version that makes sure only .dtors function pointers are
called even if the static variable is maliciously changed. */
extern func_ptr __DTOR_END__[] __attribute__((visibility ("hidden")));
static size_t dtor_idx;
const size_t max_idx = __DTOR_END__ - __DTOR_LIST__ - 1;
func_ptr f;
while (dtor_idx < max_idx)
{
f = __DTOR_LIST__[++dtor_idx];
f ();
}
}
#else /* !defined (FINI_ARRAY_SECTION_ASM_OP) */
{
static func_ptr *p = __DTOR_LIST__ + 1;
func_ptr f;
while ((f = *p))
{
p++;
f ();
}
}
#endif /* !defined(FINI_ARRAY_SECTION_ASM_OP) */
#if USE_TM_CLONE_REGISTRY
deregister_tm_clones ();
#endif /* USE_TM_CLONE_REGISTRY */
#ifdef USE_EH_FRAME_REGISTRY
#ifdef CRT_GET_RFIB_DATA
/* If we used the new __register_frame_info_bases interface,
make sure that we deregister from the same place. */
if (__deregister_frame_info_bases)
__deregister_frame_info_bases (__EH_FRAME_BEGIN__);
#else
if (__deregister_frame_info)
__deregister_frame_info (__EH_FRAME_BEGIN__);
#endif
#endif
completed = 1;
}
/* Stick a call to __do_global_dtors_aux into the .fini section. */
#ifdef FINI_SECTION_ASM_OP
CRT_CALL_STATIC_FUNCTION (FINI_SECTION_ASM_OP, __do_global_dtors_aux)
#elif defined (FINI_ARRAY_SECTION_ASM_OP)
static func_ptr __do_global_dtors_aux_fini_array_entry[]
__attribute__ ((__used__, section(".fini_array"), aligned(sizeof(func_ptr))))
= { __do_global_dtors_aux };
#else /* !FINI_SECTION_ASM_OP && !FINI_ARRAY_SECTION_ASM_OP */
static void __attribute__((used))
__do_global_dtors_aux_1 (void)
{
atexit (__do_global_dtors_aux);
}
CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__,
__do_global_dtors_aux_1)
#endif
#if defined(USE_EH_FRAME_REGISTRY) \
|| defined(__LIBGCC_JCR_SECTION_NAME__) \
|| defined(USE_TM_CLONE_REGISTRY)
/* Stick a call to __register_frame_info into the .init section. For some
reason calls with no arguments work more reliably in .init, so stick the
call in another function. */
static void __attribute__((used))
frame_dummy (void)
{
#ifdef USE_EH_FRAME_REGISTRY
static struct object object;
#ifdef CRT_GET_RFIB_DATA
void *tbase, *dbase;
tbase = 0;
CRT_GET_RFIB_DATA (dbase);
if (__register_frame_info_bases)
__register_frame_info_bases (__EH_FRAME_BEGIN__, &object, tbase, dbase);
#else
if (__register_frame_info)
__register_frame_info (__EH_FRAME_BEGIN__, &object);
#endif /* CRT_GET_RFIB_DATA */
#endif /* USE_EH_FRAME_REGISTRY */
#ifdef __LIBGCC_JCR_SECTION_NAME__
void **jcr_list;
__asm ("" : "=g" (jcr_list) : "0" (__JCR_LIST__));
if (__builtin_expect (*jcr_list != NULL, 0))
{
void (*register_classes) (void *) = _Jv_RegisterClasses;
__asm ("" : "+r" (register_classes));
if (register_classes)
register_classes (jcr_list);
}
#endif /* __LIBGCC_JCR_SECTION_NAME__ */
#if USE_TM_CLONE_REGISTRY
register_tm_clones ();
#endif /* USE_TM_CLONE_REGISTRY */
}
#ifdef __LIBGCC_INIT_SECTION_ASM_OP__
CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, frame_dummy)
#else /* defined(__LIBGCC_INIT_SECTION_ASM_OP__) */
static func_ptr __frame_dummy_init_array_entry[]
__attribute__ ((__used__, section(".init_array"), aligned(sizeof(func_ptr))))
= { frame_dummy };
#endif /* !defined(__LIBGCC_INIT_SECTION_ASM_OP__) */
#endif /* USE_EH_FRAME_REGISTRY || __LIBGCC_JCR_SECTION_NAME__ || USE_TM_CLONE_REGISTRY */
#else /* OBJECT_FORMAT_ELF */
/* The function __do_global_ctors_aux is compiled twice (once in crtbegin.o
and once in crtend.o). It must be declared static to avoid a link
error. Here, we define __do_global_ctors as an externally callable
function. It is externally callable so that __main can invoke it when
INVOKE__main is defined. This has the additional effect of forcing cc1
to switch to the .text section. */
static void __do_global_ctors_aux (void);
void
__do_global_ctors (void)
{
#ifdef INVOKE__main
/* If __main won't actually call __do_global_ctors then it doesn't matter
what's inside the function. The inside of __do_global_ctors_aux is
called automatically in that case. And the Alliant fx2800 linker
crashes on this reference. So prevent the crash. */
__do_global_ctors_aux ();
#endif
}
asm (__LIBGCC_INIT_SECTION_ASM_OP__); /* cc1 doesn't know that we are switching! */
/* A routine to invoke all of the global constructors upon entry to the
program. We put this into the .init section (for systems that have
such a thing) so that we can properly perform the construction of
file-scope static-storage C++ objects within shared libraries. */
static void __attribute__((used))
__do_global_ctors_aux (void) /* prologue goes in .init section */
{
FORCE_CODE_SECTION_ALIGN /* explicit align before switch to .text */
asm (__LIBGCC_TEXT_SECTION_ASM_OP__); /* don't put epilogue and body in .init */
DO_GLOBAL_CTORS_BODY;
atexit (__do_global_dtors);
}
#endif /* OBJECT_FORMAT_ELF */
#elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */
extern void __do_global_dtors (void);
/* This case is used by the Irix 6 port, which supports named sections but
not an SVR4-style .fini section. __do_global_dtors can be non-static
in this case because we protect it with -hidden_symbol. */
void
__do_global_dtors (void)
{
func_ptr *p, f;
for (p = __DTOR_LIST__ + 1; (f = *p); p++)
f ();
#if USE_TM_CLONE_REGISTRY
deregister_tm_clones ();
#endif /* USE_TM_CLONE_REGISTRY */
#ifdef USE_EH_FRAME_REGISTRY
if (__deregister_frame_info)
__deregister_frame_info (__EH_FRAME_BEGIN__);
#endif
}
#if defined(USE_EH_FRAME_REGISTRY) \
|| defined(__LIBGCC_JCR_SECTION_NAME__) \
|| defined(USE_TM_CLONE_REGISTRY)
/* A helper function for __do_global_ctors, which is in crtend.o. Here
in crtbegin.o, we can reference a couple of symbols not visible there.
Plus, since we're before libgcc.a, we have no problems referencing
functions from there. */
void
__do_global_ctors_1(void)
{
#ifdef USE_EH_FRAME_REGISTRY
static struct object object;
if (__register_frame_info)
__register_frame_info (__EH_FRAME_BEGIN__, &object);
#endif
#ifdef __LIBGCC_JCR_SECTION_NAME__
void **jcr_list
__asm ("" : "=g" (jcr_list) : "0" (__JCR_LIST__));
if (__builtin_expect (*jcr_list != NULL, 0))
{
void (*register_classes) (void *) = _Jv_RegisterClasses;
__asm ("" : "+r" (register_classes));
if (register_classes)
register_classes (jcr_list);
}
#endif
#if USE_TM_CLONE_REGISTRY
register_tm_clones ();
#endif /* USE_TM_CLONE_REGISTRY */
}
#endif /* USE_EH_FRAME_REGISTRY || __LIBGCC_JCR_SECTION_NAME__ || USE_TM_CLONE_REGISTRY */
#else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */
#error "What are you doing with crtstuff.c, then?"
#endif
#elif defined(CRT_END) /* ! CRT_BEGIN */
/* No need for .ctors/.dtors section if linker can place them in
.init_array/.fini_array section. */
#ifndef USE_INITFINI_ARRAY
/* Put a word containing zero at the end of each of our two lists of function
addresses. Note that the words defined here go into the .ctors and .dtors
sections of the crtend.o file, and since that file is always linked in
last, these words naturally end up at the very ends of the two lists
contained in these two sections. */
#ifdef CTOR_LIST_END
CTOR_LIST_END;
#elif defined(__LIBGCC_CTORS_SECTION_ASM_OP__)
/* Hack: force cc1 to switch to .data section early, so that assembling
__CTOR_LIST__ does not undo our behind-the-back change to .ctors. */
static func_ptr force_to_data[1] __attribute__ ((__used__)) = { };
asm (__LIBGCC_CTORS_SECTION_ASM_OP__);
STATIC func_ptr __CTOR_END__[1]
__attribute__((aligned(sizeof(func_ptr))))
= { (func_ptr) 0 };
#else
STATIC func_ptr __CTOR_END__[1]
__attribute__((section(".ctors"), aligned(sizeof(func_ptr))))
= { (func_ptr) 0 };
#endif
#ifdef DTOR_LIST_END
DTOR_LIST_END;
#elif defined(HIDDEN_DTOR_LIST_END)
#ifdef __LIBGCC_DTORS_SECTION_ASM_OP__
asm (__LIBGCC_DTORS_SECTION_ASM_OP__);
#endif
func_ptr __DTOR_END__[1]
__attribute__ ((used,
#ifndef __LIBGCC_DTORS_SECTION_ASM_OP__
section(".dtors"),
#endif
aligned(sizeof(func_ptr)), visibility ("hidden")))
= { (func_ptr) 0 };
#elif defined(__LIBGCC_DTORS_SECTION_ASM_OP__)
asm (__LIBGCC_DTORS_SECTION_ASM_OP__);
STATIC func_ptr __DTOR_END__[1]
__attribute__ ((used, aligned(sizeof(func_ptr))))
= { (func_ptr) 0 };
#else
STATIC func_ptr __DTOR_END__[1]
__attribute__((used, section(".dtors"), aligned(sizeof(func_ptr))))
= { (func_ptr) 0 };
#endif
#endif /* USE_INITFINI_ARRAY */
#ifdef __LIBGCC_EH_FRAME_SECTION_NAME__
/* Terminate the frame unwind info section with a 4byte 0 as a sentinel;
this would be the 'length' field in a real FDE. */
# if __INT_MAX__ == 2147483647
typedef int int32;
# elif __LONG_MAX__ == 2147483647
typedef long int32;
# elif __SHRT_MAX__ == 2147483647
typedef short int32;
# else
# error "Missing a 4 byte integer"
# endif
STATIC EH_FRAME_SECTION_CONST int32 __FRAME_END__[]
__attribute__ ((used, section(__LIBGCC_EH_FRAME_SECTION_NAME__),
aligned(sizeof(int32))))
= { 0 };
#endif /* __LIBGCC_EH_FRAME_SECTION_NAME__ */
#ifdef __LIBGCC_JCR_SECTION_NAME__
/* Null terminate the .jcr section array. */
STATIC void *__JCR_END__[1]
__attribute__ ((used, section(__LIBGCC_JCR_SECTION_NAME__),
aligned(sizeof(void *))))
= { 0 };
#endif /* __LIBGCC_JCR_SECTION_NAME__ */
#if USE_TM_CLONE_REGISTRY
# ifndef HAVE_GAS_HIDDEN
static
# endif
func_ptr __TMC_END__[]
__attribute__((used, section(".tm_clone_table"), aligned(sizeof(void *))))
# ifdef HAVE_GAS_HIDDEN
__attribute__((__visibility__ ("hidden"))) = { };
# else
= { 0, 0 };
# endif
#endif /* USE_TM_CLONE_REGISTRY */
#ifdef __LIBGCC_INIT_ARRAY_SECTION_ASM_OP__
/* If we are using .init_array, there is nothing to do. */
#elif defined(__LIBGCC_INIT_SECTION_ASM_OP__)
#ifdef OBJECT_FORMAT_ELF
static void __attribute__((used))
__do_global_ctors_aux (void)
{
func_ptr *p;
for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
(*p) ();
}
/* Stick a call to __do_global_ctors_aux into the .init section. */
CRT_CALL_STATIC_FUNCTION (__LIBGCC_INIT_SECTION_ASM_OP__, __do_global_ctors_aux)
#else /* OBJECT_FORMAT_ELF */
/* Stick the real initialization code, followed by a normal sort of
function epilogue at the very end of the .init section for this
entire root executable file or for this entire shared library file.
Note that we use some tricks here to get *just* the body and just
a function epilogue (but no function prologue) into the .init
section of the crtend.o file. Specifically, we switch to the .text
section, start to define a function, and then we switch to the .init
section just before the body code.
Earlier on, we put the corresponding function prologue into the .init
section of the crtbegin.o file (which will be linked in first).
Note that we want to invoke all constructors for C++ file-scope static-
storage objects AFTER any other possible initialization actions which
may be performed by the code in the .init section contributions made by
other libraries, etc. That's because those other initializations may
include setup operations for very primitive things (e.g. initializing
the state of the floating-point coprocessor, etc.) which should be done
before we start to execute any of the user's code. */
static void
__do_global_ctors_aux (void) /* prologue goes in .text section */
{
asm (__LIBGCC_INIT_SECTION_ASM_OP__);
DO_GLOBAL_CTORS_BODY;
atexit (__do_global_dtors);
} /* epilogue and body go in .init section */
FORCE_CODE_SECTION_ALIGN
asm (__LIBGCC_TEXT_SECTION_ASM_OP__);
#endif /* OBJECT_FORMAT_ELF */
#elif defined(HAS_INIT_SECTION) /* ! __LIBGCC_INIT_SECTION_ASM_OP__ */
extern void __do_global_ctors (void);
/* This case is used by the Irix 6 port, which supports named sections but
not an SVR4-style .init section. __do_global_ctors can be non-static
in this case because we protect it with -hidden_symbol. */
void
__do_global_ctors (void)
{
func_ptr *p;
#if defined(USE_EH_FRAME_REGISTRY) \
|| defined(__LIBGCC_JCR_SECTION_NAME__) \
|| defined(USE_TM_CLONE_REGISTRY)
__do_global_ctors_1();
#endif
for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
(*p) ();
}
#else /* ! __LIBGCC_INIT_SECTION_ASM_OP__ && ! HAS_INIT_SECTION */
#error "What are you doing with crtstuff.c, then?"
#endif
#else /* ! CRT_BEGIN && ! CRT_END */
#error "One of CRT_BEGIN or CRT_END must be defined."
#endif
|