summaryrefslogtreecommitdiff
path: root/sysdeps/generic/ldsodefs.h
blob: 08039e18cad7573b13bcb268cc8dffefb47e1b40 (plain)
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
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
/* Run-time dynamic linker data structures for loaded ELF shared objects.
   Copyright (C) 1995-2003, 2004, 2005 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#ifndef	_LDSODEFS_H
#define	_LDSODEFS_H	1

#include <features.h>

#include <stdbool.h>
#define __need_size_t
#define __need_NULL
#include <stddef.h>
#include <string.h>

#include <elf.h>
#include <dlfcn.h>
#include <fpu_control.h>
#include <sys/mman.h>
#include <link.h>
#include <dl-lookupcfg.h>
#include <dl-sysdep.h>
#include <bits/libc-lock.h>
#include <hp-timing.h>
#include <tls.h>

__BEGIN_DECLS

/* We use this macro to refer to ELF types independent of the native wordsize.
   `ElfW(TYPE)' is used in place of `Elf32_TYPE' or `Elf64_TYPE'.  */
#define ELFW(type)	_ElfW (ELF, __ELF_NATIVE_CLASS, type)

/* All references to the value of l_info[DT_PLTGOT],
  l_info[DT_STRTAB], l_info[DT_SYMTAB], l_info[DT_RELA],
  l_info[DT_REL], l_info[DT_JMPREL], and l_info[VERSYMIDX (DT_VERSYM)]
  have to be accessed via the D_PTR macro.  The macro is needed since for
  most architectures the entry is already relocated - but for some not
  and we need to relocate at access time.  */
#ifdef DL_RO_DYN_SECTION
# define D_PTR(map, i) ((map)->i->d_un.d_ptr + (map)->l_addr)
#else
# define D_PTR(map, i) (map)->i->d_un.d_ptr
#endif

/* Result of the lookup functions and how to retrieve the base address.  */
typedef struct link_map *lookup_t;
# define LOOKUP_VALUE(map) map
# define LOOKUP_VALUE_ADDRESS(map) ((map) ? (map)->l_addr : 0)

/* on some architectures a pointer to a function is not just a pointer
   to the actual code of the function but rather an architecture
   specific descriptor. */
#ifndef ELF_FUNCTION_PTR_IS_SPECIAL
# define DL_SYMBOL_ADDRESS(map, ref) \
 (void *) (LOOKUP_VALUE_ADDRESS (map) + ref->st_value)
# define DL_LOOKUP_ADDRESS(addr) ((ElfW(Addr)) (addr))
# define DL_DT_INIT_ADDRESS(map, start) (start)
# define DL_DT_FINI_ADDRESS(map, start) (start)
#endif

/* Unmap a loaded object, called by _dl_close (). */
#ifndef DL_UNMAP_IS_SPECIAL
# define DL_UNMAP(map) \
 __munmap ((void *) (map)->l_map_start,					      \
	   (map)->l_map_end - (map)->l_map_start)
#endif

/* By default we do not need special support to initialize DSOs loaded
   by statically linked binaries.  */
#ifndef DL_STATIC_INIT
# define DL_STATIC_INIT(map)
#endif

/* Reloc type classes as returned by elf_machine_type_class().
   ELF_RTYPE_CLASS_PLT means this reloc should not be satisfied by
   some PLT symbol, ELF_RTYPE_CLASS_COPY means this reloc should not be
   satisfied by any symbol in the executable.  Some architectures do
   not support copy relocations.  In this case we define the macro to
   zero so that the code for handling them gets automatically optimized
   out.  */
#define ELF_RTYPE_CLASS_PLT 1
#ifndef DL_NO_COPY_RELOCS
# define ELF_RTYPE_CLASS_COPY 2
#else
# define ELF_RTYPE_CLASS_COPY 0
#endif

/* ELF uses the PF_x macros to specify the segment permissions, mmap
   uses PROT_xxx.  In most cases the three macros have the values 1, 2,
   and 3 but not in a matching order.  The following macros allows
   converting from the PF_x values to PROT_xxx values.  */
#define PF_TO_PROT \
  ((PROT_READ << (PF_R * 4))						      \
   | (PROT_WRITE << (PF_W * 4))						      \
   | (PROT_EXEC << (PF_X * 4))						      \
   | ((PROT_READ | PROT_WRITE) << ((PF_R | PF_W) * 4))			      \
   | ((PROT_READ | PROT_EXEC) << ((PF_R | PF_X) * 4))			      \
   | ((PROT_WRITE | PROT_EXEC) << (PF_W | PF_X) * 4)			      \
   | ((PROT_READ | PROT_WRITE | PROT_EXEC) << ((PF_R | PF_W | PF_X) * 4)))


/* For the version handling we need an array with only names and their
   hash values.  */
struct r_found_version
  {
    const char *name;
    ElfW(Word) hash;

    int hidden;
    const char *filename;
  };

/* We want to cache information about the searches for shared objects.  */

enum r_dir_status { unknown, nonexisting, existing };

struct r_search_path_elem
  {
    /* This link is only used in the `all_dirs' member of `r_search_path'.  */
    struct r_search_path_elem *next;

    /* Strings saying where the definition came from.  */
    const char *what;
    const char *where;

    /* Basename for this search path element.  The string must end with
       a slash character.  */
    const char *dirname;
    size_t dirnamelen;

    enum r_dir_status status[0];
  };

struct r_strlenpair
  {
    const char *str;
    size_t len;
  };


/* A data structure for a simple single linked list of strings.  */
struct libname_list
  {
    const char *name;		/* Name requested (before search).  */
    struct libname_list *next;	/* Link to next name for this object.  */
    int dont_free;		/* Flag whether this element should be freed
				   if the object is not entirely unloaded.  */
  };


/* Bit masks for the objects which valid callers can come from to
   functions with restricted interface.  */
enum allowmask
  {
    allow_libc = 1,
    allow_libdl = 2,
    allow_libpthread = 4,
    allow_ldso = 8
  };


/* Type for list of auditing interfaces.  */
struct La_i86_regs;
struct La_i86_retval;
struct La_x86_64_regs;
struct La_x86_64_retval;
struct La_ppc32_regs;
struct La_ppc32_retval;
struct La_ppc64_regs;
struct La_ppc64_retval;
struct La_sh_regs;
struct La_sh_retval;
struct La_m68k_regs;
struct La_m68k_retval;
struct La_alpha_regs;
struct La_alpha_retval;
struct La_s390_32_regs;
struct La_s390_32_retval;
struct La_s390_64_regs;
struct La_s390_64_retval;
struct La_ia64_regs;
struct La_ia64_retval;

struct audit_ifaces
{
  void (*activity) (uintptr_t *, unsigned int);
  char *(*objsearch) (const char *, uintptr_t *, unsigned int);
  unsigned int (*objopen) (struct link_map *, Lmid_t, uintptr_t *);
  void (*preinit) (uintptr_t *);
  union
  {
    uintptr_t (*symbind32) (Elf32_Sym *, unsigned int, uintptr_t *,
			    uintptr_t *, unsigned int *, const char *);
    uintptr_t (*symbind64) (Elf64_Sym *, unsigned int, uintptr_t *,
			    uintptr_t *, unsigned int *, const char *);
  };
  union
  {
    Elf32_Addr (*i86_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *,
				    uintptr_t *, struct La_i86_regs *,
				    unsigned int *, const char *name,
				    long int *framesizep);
    Elf64_Addr (*x86_64_gnu_pltenter) (Elf64_Sym *, unsigned int, uintptr_t *,
				       uintptr_t *, struct La_x86_64_regs *,
				       unsigned int *, const char *name,
				       long int *framesizep);
    Elf32_Addr (*ppc32_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *,
				      uintptr_t *, struct La_ppc32_regs *,
				      unsigned int *, const char *name,
				      long int *framesizep);
    Elf64_Addr (*ppc64_gnu_pltenter) (Elf64_Sym *, unsigned int, uintptr_t *,
				      uintptr_t *, struct La_ppc64_regs *,
				      unsigned int *, const char *name,
				      long int *framesizep);
    uintptr_t (*sh_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *,
				  uintptr_t *, const struct La_sh_regs *,
				  unsigned int *, const char *name,
				  long int *framesizep);
    Elf32_Addr (*m68k_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *,
				     uintptr_t *, struct La_m68k_regs *,
				     unsigned int *, const char *name,
				     long int *framesizep);
    Elf64_Addr (*alpha_gnu_pltenter) (Elf64_Sym *, unsigned int, uintptr_t *,
				      uintptr_t *, struct La_alpha_regs *,
				      unsigned int *, const char *name,
				      long int *framesizep);
    Elf32_Addr (*s390_32_gnu_pltenter) (Elf32_Sym *, unsigned int, uintptr_t *,
					uintptr_t *, struct La_s390_32_regs *,
					unsigned int *, const char *name,
					long int *framesizep);
    Elf64_Addr (*s390_64_gnu_pltenter) (Elf64_Sym *, unsigned int, uintptr_t *,
					uintptr_t *, struct La_s390_64_regs *,
					unsigned int *, const char *name,
					long int *framesizep);
    Elf64_Addr (*ia64_gnu_pltenter) (Elf64_Sym *, unsigned int, uintptr_t *,
				     uintptr_t *, struct La_ia64_regs *,
				     unsigned int *, const char *name,
				     long int *framesizep);
  };
  union
  {
    unsigned int (*i86_gnu_pltexit) (Elf32_Sym *, unsigned int, uintptr_t *,
				     uintptr_t *, const struct La_i86_regs *,
				     struct La_i86_retval *, const char *);
    unsigned int (*x86_64_gnu_pltexit) (Elf64_Sym *, unsigned int, uintptr_t *,
					uintptr_t *,
					const struct La_x86_64_regs *,
					struct La_x86_64_retval *,
					const char *);
    unsigned int (*ppc32_gnu_pltexit) (Elf32_Sym *, unsigned int, uintptr_t *,
				       uintptr_t *,
				       const struct La_ppc32_regs *,
				       struct La_ppc32_retval *, const char *);
    unsigned int (*ppc64_gnu_pltexit) (Elf64_Sym *, unsigned int, uintptr_t *,
				       uintptr_t *,
				       const struct La_ppc64_regs *,
				       struct La_ppc64_retval *, const char *);
    unsigned int (*sh_gnu_pltexit) (Elf32_Sym *, unsigned int, uintptr_t *,
				    uintptr_t *, const struct La_sh_regs *,
				    struct La_sh_retval *, const char *);
    unsigned int (*m68k_gnu_pltexit) (Elf32_Sym *, unsigned int, uintptr_t *,
				      uintptr_t *, const struct La_m68k_regs *,
				      struct La_m68k_retval *, const char *);
    unsigned int (*alpha_gnu_pltexit) (Elf64_Sym *, unsigned int, uintptr_t *,
				       uintptr_t *,
				       const struct La_alpha_regs *,
				       struct La_alpha_retval *, const char *);
    unsigned int (*s390_32_gnu_pltexit) (Elf32_Sym *, unsigned int,
					 uintptr_t *, uintptr_t *,
					 const struct La_s390_32_regs *,
					 struct La_s390_32_retval *,
					 const char *);
    unsigned int (*s390_64_gnu_pltexit) (Elf64_Sym *, unsigned int,
					 uintptr_t *, uintptr_t *,
					 const struct La_s390_64_regs *,
					 struct La_s390_64_retval *,
					 const char *);
    unsigned int (*ia64_gnu_pltexit) (Elf64_Sym *, unsigned int, uintptr_t *,
				      uintptr_t *,
				      const struct La_ia64_regs *,
				      struct La_ia64_retval *, const char *);
  };
  unsigned int (*objclose) (uintptr_t *);

  struct audit_ifaces *next;
};


/* Test whether given NAME matches any of the names of the given object.  */
extern int _dl_name_match_p (const char *__name, struct link_map *__map)
     internal_function;

/* Function used as argument for `_dl_receive_error' function.  The
   arguments are the error code, error string, and the objname the
   error occurred in.  */
typedef void (*receiver_fct) (int, const char *, const char *);

/* Internal functions of the run-time dynamic linker.
   These can be accessed if you link again the dynamic linker
   as a shared library, as in `-lld' or `/lib/ld.so' explicitly;
   but are not normally of interest to user programs.

   The `-ldl' library functions in <dlfcn.h> provide a simple
   user interface to run-time dynamic linking.  */


#ifndef SHARED
# define EXTERN extern
# define GL(name) _##name
#else
# define EXTERN
# ifdef IS_IN_rtld
#  define GL(name) _rtld_local._##name
# else
#  define GL(name) _rtld_global._##name
# endif
struct rtld_global
{
#endif
  /* Don't change the order of the following elements.  'dl_loaded'
     must remain the first element.  Forever.  */

/* Non-shared code has no support for multiple namespaces.  */
#ifdef SHARED
# define DL_NNS 16
#else
# define DL_NNS 1
#endif
  EXTERN struct link_namespaces
  {
    /* A pointer to the map for the main map.  */
    struct link_map *_ns_loaded;
    /* Number of object in the _dl_loaded list.  */
    unsigned int _ns_nloaded;
    /* Array representing global scope.  */
    struct r_scope_elem *_ns_global_scope[2];
    /* Direct pointer to the searchlist of the main object.  */
    struct r_scope_elem *_ns_main_searchlist;
    /* This is zero at program start to signal that the global scope map is
       allocated by rtld.  Later it keeps the size of the map.  It might be
       reset if in _dl_close if the last global object is removed.  */
    size_t _ns_global_scope_alloc;
    /* Keep track of changes to each namespace' list.  */
    struct r_debug _ns_debug;
  } _dl_ns[DL_NNS];

  /* During the program run we must not modify the global data of
     loaded shared object simultanously in two threads.  Therefore we
     protect `_dl_open' and `_dl_close' in dl-close.c.

     This must be a recursive lock since the initializer function of
     the loaded object might as well require a call to this function.
     At this time it is not anymore a problem to modify the tables.  */
  __rtld_lock_define_recursive (EXTERN, _dl_load_lock)

  /* Incremented whenever something may have been added to dl_loaded.  */
  EXTERN unsigned long long _dl_load_adds;

#ifndef MAP_ANON
  /* File descriptor referring to the zero-fill device.  */
  EXTERN int _dl_zerofd;
#endif

  /* The object to be initialized first.  */
  EXTERN struct link_map *_dl_initfirst;

#if HP_TIMING_AVAIL || HP_SMALL_TIMING_AVAIL
  /* Start time on CPU clock.  */
  EXTERN hp_timing_t _dl_cpuclock_offset;
#endif

  /* Map of shared object to be profiled.  */
  EXTERN struct link_map *_dl_profile_map;

  /* Counters for the number of relocations performed.  */
  EXTERN unsigned long int _dl_num_relocations;
  EXTERN unsigned long int _dl_num_cache_relocations;

  /* List of search directories.  */
  EXTERN struct r_search_path_elem *_dl_all_dirs;

#ifdef _LIBC_REENTRANT
  EXTERN void **(*_dl_error_catch_tsd) (void) __attribute__ ((const));
#endif

  /* Structure describing the dynamic linker itself.  We need to
     reserve memory for the data the audit libraries need.  */
  EXTERN struct link_map _dl_rtld_map;
#ifdef SHARED
  struct auditstate audit_data[DL_NNS];
#endif

#if defined SHARED && defined _LIBC_REENTRANT \
    && defined __rtld_lock_default_lock_recursive
  EXTERN void (*_dl_rtld_lock_recursive) (void *);
  EXTERN void (*_dl_rtld_unlock_recursive) (void *);
#endif

  /* Prevailing state of the stack, PF_X indicating it's executable.  */
  EXTERN ElfW(Word) _dl_stack_flags;

  /* If loading a shared object requires that we make the stack executable
     when it was not, we do it by calling this function.
     It returns an errno code or zero on success.  */
  EXTERN int (*_dl_make_stack_executable_hook) (void **) internal_function;

  /* Keep the conditional TLS members at the end so the layout of the
     structure used by !USE_TLS code matches the prefix of the layout in
     the USE_TLS rtld.  Note that `struct link_map' is conditionally
     defined as well, so _dl_rtld_map needs to be last before this.  */
#ifdef USE_TLS
  /* Highest dtv index currently needed.  */
  EXTERN size_t _dl_tls_max_dtv_idx;
  /* Flag signalling whether there are gaps in the module ID allocation.  */
  EXTERN bool _dl_tls_dtv_gaps;
  /* Information about the dtv slots.  */
  EXTERN struct dtv_slotinfo_list
  {
    size_t len;
    struct dtv_slotinfo_list *next;
    struct dtv_slotinfo
    {
      size_t gen;
      bool is_static;
      struct link_map *map;
    } slotinfo[0];
  } *_dl_tls_dtv_slotinfo_list;
  /* Number of modules in the static TLS block.  */
  EXTERN size_t _dl_tls_static_nelem;
  /* Size of the static TLS block.  */
  EXTERN size_t _dl_tls_static_size;
  /* Size actually allocated in the static TLS block.  */
  EXTERN size_t _dl_tls_static_used;
  /* Alignment requirement of the static TLS block.  */
  EXTERN size_t _dl_tls_static_align;

/* Number of additional entries in the slotinfo array of each slotinfo
   list element.  A large number makes it almost certain take we never
   have to iterate beyond the first element in the slotinfo list.  */
# define TLS_SLOTINFO_SURPLUS (62)

/* Number of additional slots in the dtv allocated.  */
# define DTV_SURPLUS	(14)

  /* Initial dtv of the main thread, not allocated with normal malloc.  */
  EXTERN void *_dl_initial_dtv;
  /* Generation counter for the dtv.  */
  EXTERN size_t _dl_tls_generation;

  EXTERN void (*_dl_init_static_tls) (struct link_map *);
#endif

#ifdef SHARED
};
# define __rtld_global_attribute__
# ifdef IS_IN_rtld
#  ifdef HAVE_VISIBILITY_ATTRIBUTE
#   ifdef HAVE_SDATA_SECTION
#    define __rtld_local_attribute__ \
	    __attribute__ ((visibility ("hidden"), section (".sdata")))
#    undef __rtld_global_attribute__
#    define __rtld_global_attribute__ __attribute__ ((section (".sdata")))
#   else
#    define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
#   endif
#  else
#   define __rtld_local_attribute__
#  endif
extern struct rtld_global _rtld_local __rtld_local_attribute__;
#  undef __rtld_local_attribute__
# endif
extern struct rtld_global _rtld_global __rtld_global_attribute__;
# undef __rtld_global_attribute__
#endif

#ifndef SHARED
# define GLRO(name) _##name
#else
# ifdef IS_IN_rtld
#  define GLRO(name) _rtld_local_ro._##name
# else
#  define GLRO(name) _rtld_global_ro._##name
# endif
struct rtld_global_ro
{
#endif

  /* If nonzero the appropriate debug information is printed.  */
  EXTERN int _dl_debug_mask;
#define DL_DEBUG_LIBS	    (1 << 0)
#define DL_DEBUG_IMPCALLS   (1 << 1)
#define DL_DEBUG_BINDINGS   (1 << 2)
#define DL_DEBUG_SYMBOLS    (1 << 3)
#define DL_DEBUG_VERSIONS   (1 << 4)
#define DL_DEBUG_RELOC      (1 << 5)
#define DL_DEBUG_FILES      (1 << 6)
#define DL_DEBUG_STATISTICS (1 << 7)
#define DL_DEBUG_UNUSED	    (1 << 8)
/* These two are used only internally.  */
#define DL_DEBUG_HELP       (1 << 9)
#define DL_DEBUG_PRELINK    (1 << 10)

  /* Cached value of `getpagesize ()'.  */
  EXTERN size_t _dl_pagesize;

  /* OS version.  */
  EXTERN unsigned int _dl_osversion;
  /* Platform name.  */
  EXTERN const char *_dl_platform;
  EXTERN size_t _dl_platformlen;

  /* Copy of the content of `_dl_main_searchlist' at startup time.  */
  EXTERN struct r_scope_elem _dl_initial_searchlist;

  /* CLK_TCK as reported by the kernel.  */
  EXTERN int _dl_clktck;

  /* If nonzero print warnings messages.  */
  EXTERN int _dl_verbose;

  /* File descriptor to write debug messages to.  */
  EXTERN int _dl_debug_fd;

  /* Do we do lazy relocations?  */
  EXTERN int _dl_lazy;

  /* Nonzero if runtime lookups should not update the .got/.plt.  */
  EXTERN int _dl_bind_not;

  /* Nonzero if references should be treated as weak during runtime
     linking.  */
  EXTERN int _dl_dynamic_weak;

  /* Default floating-point control word.  */
  EXTERN fpu_control_t _dl_fpu_control;

  /* Expected cache ID.  */
  EXTERN int _dl_correct_cache_id;

  /* Mask for hardware capabilities that are available.  */
  EXTERN unsigned long int _dl_hwcap;

  /* Mask for important hardware capabilities we honour. */
  EXTERN unsigned long int _dl_hwcap_mask;

  /* Get architecture specific definitions.  */
#define PROCINFO_DECL
#ifndef PROCINFO_CLASS
# define PROCINFO_CLASS EXTERN
#endif
#include <dl-procinfo.c>

  /* Names of shared object for which the RPATH should be ignored.  */
  EXTERN const char *_dl_inhibit_rpath;

  /* Location of the binary.  */
  EXTERN const char *_dl_origin_path;

  /* -1 if the dynamic linker should honor library load bias,
     0 if not, -2 use the default (honor biases for normal
     binaries, don't honor for PIEs).  */
  EXTERN ElfW(Addr) _dl_use_load_bias;

  /* Name of the shared object to be profiled (if any).  */
  EXTERN const char *_dl_profile;
  /* Filename of the output file.  */
  EXTERN const char *_dl_profile_output;
  /* Name of the object we want to trace the prelinking.  */
  EXTERN const char *_dl_trace_prelink;
  /* Map of shared object to be prelink traced.  */
  EXTERN struct link_map *_dl_trace_prelink_map;

  /* All search directories defined at startup.  */
  EXTERN struct r_search_path_elem *_dl_init_all_dirs;

#if HP_TIMING_AVAIL || HP_SMALL_TIMING_AVAIL
  /* Overhead of a high-precision timing measurement.  */
  EXTERN hp_timing_t _dl_hp_timing_overhead;
#endif

#ifdef NEED_DL_SYSINFO
  /* Syscall handling improvements.  This is very specific to x86.  */
  EXTERN uintptr_t _dl_sysinfo;
#endif

#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO
  /* The vsyscall page is a virtual DSO pre-mapped by the kernel.
     This points to its ELF header.  */
  EXTERN const ElfW(Ehdr) *_dl_sysinfo_dso;
#endif

#ifdef SHARED
  /* We add a function table to _rtld_global which is then used to
     call the function instead of going through the PLT.  The result
     is that we can avoid exporting the functions and we do not jump
     PLT relocations in libc.so.  */
  void (*_dl_debug_printf) (const char *, ...)
       __attribute__ ((__format__ (__printf__, 1, 2)));
  int (internal_function *_dl_catch_error) (const char **, const char **,
					    void (*) (void *), void *);
  void (internal_function *_dl_signal_error) (int, const char *, const char *,
					      const char *);
  void (*_dl_mcount) (ElfW(Addr) frompc, ElfW(Addr) selfpc);
  lookup_t (internal_function *_dl_lookup_symbol_x) (const char *,
						     struct link_map *,
						     const ElfW(Sym) **,
						     struct r_scope_elem *[],
						     const struct r_found_version *,
						     int, int,
						     struct link_map *);
  int (*_dl_check_caller) (const void *, enum allowmask);
  void *(*_dl_open) (const char *file, int mode, const void *caller_dlopen,
		     Lmid_t nsid, int argc, char *argv[], char *env[]);
  void (*_dl_close) (void *map);

  /* List of auditing interfaces.  */
  struct audit_ifaces *_dl_audit;
  unsigned int _dl_naudit;
};
# define __rtld_global_attribute__
# ifdef IS_IN_rtld
#  ifdef HAVE_VISIBILITY_ATTRIBUTE
#   define __rtld_local_attribute__ __attribute__ ((visibility ("hidden")))
#  else
#   define __rtld_local_attribute__
#  endif
extern struct rtld_global_ro _rtld_local_ro
    attribute_relro __rtld_local_attribute__;
extern struct rtld_global_ro _rtld_global_ro
    attribute_relro __rtld_global_attribute__;
#  undef __rtld_local_attribute__
# else
/* We cheat a bit here.  We declare the variable as as const even
   though it is at startup.  */
extern const struct rtld_global_ro _rtld_global_ro
    attribute_relro __rtld_global_attribute__;
# endif
# undef __rtld_global_attribute__
#endif
#undef EXTERN

#ifdef IS_IN_rtld
/* This is the initial value of GL(dl_error_catch_tsd).
   A non-TLS libpthread will change it.  */
extern void **_dl_initial_error_catch_tsd (void) __attribute__ ((const))
     attribute_hidden;
#endif

/* This is the initial value of GL(dl_make_stack_executable_hook).
   A threads library can change it.  */
extern int _dl_make_stack_executable (void **stack_endp) internal_function;
rtld_hidden_proto (_dl_make_stack_executable)

/* Variable pointing to the end of the stack (or close to it).  This value
   must be constant over the runtime of the application.  Some programs
   might use the variable which results in copy relocations on some
   platforms.  But this does not matter, ld.so can always use the local
   copy.  */
extern void *__libc_stack_end attribute_relro;
rtld_hidden_proto (__libc_stack_end)

/* Parameters passed to the dynamic linker.  */
extern int _dl_argc attribute_hidden attribute_relro;
extern char **_dl_argv
#ifndef DL_ARGV_NOT_RELRO
     attribute_relro
#endif
     ;
#ifdef IS_IN_rtld
extern char **_dl_argv_internal attribute_hidden
# ifndef DL_ARGV_NOT_RELRO
     attribute_relro
# endif
     ;
# define rtld_progname (INTUSE(_dl_argv)[0])
#else
# define rtld_progname _dl_argv[0]
#endif

/* The array with message we print as a last resort.  */
extern const char _dl_out_of_memory[];
#ifdef IS_IN_rtld
/* XXX #ifdef should go away.  */
extern const char _dl_out_of_memory_internal[] attribute_hidden;
#endif

/* Flag set at startup and cleared when the last initializer has run.  */
extern int _dl_starting_up;
weak_extern (_dl_starting_up)
#ifdef IS_IN_rtld
extern int _dl_starting_up_internal attribute_hidden;
#endif

/* OS-dependent function to open the zero-fill device.  */
extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */


/* Write message on the debug file descriptor.  The parameters are
   interpreted as for a `printf' call.  All the lines start with a
   tag showing the PID.  */
extern void _dl_debug_printf (const char *fmt, ...)
     __attribute__ ((__format__ (__printf__, 1, 2))) attribute_hidden;

/* Write message on the debug file descriptor.  The parameters are
   interpreted as for a `printf' call.  All the lines buf the first
   start with a tag showing the PID.  */
extern void _dl_debug_printf_c (const char *fmt, ...)
     __attribute__ ((__format__ (__printf__, 1, 2)));


/* Write a message on the specified descriptor FD.  The parameters are
   interpreted as for a `printf' call.  */
extern void _dl_dprintf (int fd, const char *fmt, ...)
     __attribute__ ((__format__ (__printf__, 2, 3)))
     attribute_hidden;

/* Write a message on the specified descriptor standard output.  The
   parameters are interpreted as for a `printf' call.  */
#define _dl_printf(fmt, args...) \
  _dl_dprintf (STDOUT_FILENO, fmt, ##args)

/* Write a message on the specified descriptor standard error.  The
   parameters are interpreted as for a `printf' call.  */
#define _dl_error_printf(fmt, args...) \
  _dl_dprintf (STDERR_FILENO, fmt, ##args)

/* Write a message on the specified descriptor standard error and exit
   the program.  The parameters are interpreted as for a `printf' call.  */
#define _dl_fatal_printf(fmt, args...) \
  do									      \
    {									      \
      _dl_dprintf (STDERR_FILENO, fmt, ##args);				      \
      _exit (127);							      \
    }									      \
  while (1)


/* This function is called by all the internal dynamic linker functions
   when they encounter an error.  ERRCODE is either an `errno' code or
   zero; OBJECT is the name of the problematical shared object, or null if
   it is a general problem; ERRSTRING is a string describing the specific
   problem.  */
extern void _dl_signal_error (int errcode, const char *object,
			      const char *occurred, const char *errstring)
     internal_function __attribute__ ((__noreturn__)) attribute_hidden;

/* Like _dl_signal_error, but may return when called in the context of
   _dl_receive_error.  */
extern void _dl_signal_cerror (int errcode, const char *object,
			       const char *occation, const char *errstring)
     internal_function;

/* Call OPERATE, receiving errors from `dl_signal_cerror'.  Unlike
   `_dl_catch_error' the operation is resumed after the OPERATE
   function returns.
   ARGS is passed as argument to OPERATE.  */
extern void _dl_receive_error (receiver_fct fct, void (*operate) (void *),
			       void *args)
     internal_function;


/* Open the shared object NAME and map in its segments.
   LOADER's DT_RPATH is used in searching for NAME.
   If the object is already opened, returns its existing map.
   For preloaded shared objects PRELOADED is set to a non-zero
   value to allow additional security checks.  */
extern struct link_map *_dl_map_object (struct link_map *loader,
					const char *name, int preloaded,
					int type, int trace_mode, int mode,
					Lmid_t nsid)
     internal_function attribute_hidden;

/* Call _dl_map_object on the dependencies of MAP, and set up
   MAP->l_searchlist.  PRELOADS points to a vector of NPRELOADS previously
   loaded objects that will be inserted into MAP->l_searchlist after MAP
   but before its dependencies.  */
extern void _dl_map_object_deps (struct link_map *map,
				 struct link_map **preloads,
				 unsigned int npreloads, int trace_mode,
				 int open_mode)
     internal_function attribute_hidden;

/* Cache the locations of MAP's hash table.  */
extern void _dl_setup_hash (struct link_map *map)
     internal_function attribute_hidden;


/* Collect the directories in the search path for LOADER's dependencies.
   The data structure is defined in <dlfcn.h>.  If COUNTING is true,
   SI->dls_cnt and SI->dls_size are set; if false, those must be as set
   by a previous call with COUNTING set, and SI must point to SI->dls_size
   bytes to be used in filling in the result.  */
extern void _dl_rtld_di_serinfo (struct link_map *loader,
				 Dl_serinfo *si, bool counting)
     internal_function;


/* Search loaded objects' symbol tables for a definition of the symbol
   referred to by UNDEF.  *SYM is the symbol table entry containing the
   reference; it is replaced with the defining symbol, and the base load
   address of the defining object is returned.  SYMBOL_SCOPE is a
   null-terminated list of object scopes to search; each object's
   l_searchlist (i.e. the segment of the dependency tree starting at that
   object) is searched in turn.  REFERENCE_NAME should name the object
   containing the reference; it is used in error messages.
   TYPE_CLASS describes the type of symbol we are looking for.  */
enum
  {
    /* If necessary add dependency between user and provider object.  */
    DL_LOOKUP_ADD_DEPENDENCY = 1,
    /* Return most recent version instead of default version for
       unversioned lookup.  */
    DL_LOOKUP_RETURN_NEWEST = 2
  };

/* Lookup versioned symbol.  */
extern lookup_t _dl_lookup_symbol_x (const char *undef,
				     struct link_map *undef_map,
				     const ElfW(Sym) **sym,
				     struct r_scope_elem *symbol_scope[],
				     const struct r_found_version *version,
				     int type_class, int explicit,
				     struct link_map *skip_map)
     internal_function attribute_hidden;


/* Look up symbol NAME in MAP's scope and return its run-time address.  */
extern ElfW(Addr) _dl_symbol_value (struct link_map *map, const char *name)
     internal_function;

/* Allocate a `struct link_map' for a new object being loaded,
   and enter it into the _dl_main_map list.  */
extern struct link_map *_dl_new_object (char *realname, const char *libname,
					int type, struct link_map *loader,
					int mode, Lmid_t nsid)
     internal_function attribute_hidden;

/* Relocate the given object (if it hasn't already been).
   SCOPE is passed to _dl_lookup_symbol in symbol lookups.
   If LAZY is nonzero, don't relocate its PLT.  */
extern void _dl_relocate_object (struct link_map *map,
				 struct r_scope_elem *scope[],
				 int lazy, int consider_profiling)
     attribute_hidden;

/* Protect PT_GNU_RELRO area.  */
extern void _dl_protect_relro (struct link_map *map)
     internal_function attribute_hidden;

/* Call _dl_signal_error with a message about an unhandled reloc type.
   TYPE is the result of ELFW(R_TYPE) (r_info), i.e. an R_<CPU>_* value.
   PLT is nonzero if this was a PLT reloc; it just affects the message.  */
extern void _dl_reloc_bad_type (struct link_map *map,
				unsigned int type, int plt)
     internal_function __attribute__ ((__noreturn__));

/* Resolve conflicts if prelinking.  */
extern void _dl_resolve_conflicts (struct link_map *l,
				   ElfW(Rela) *conflict,
				   ElfW(Rela) *conflictend);

/* Check the version dependencies of all objects available through
   MAP.  If VERBOSE print some more diagnostics.  */
extern int _dl_check_all_versions (struct link_map *map, int verbose,
				   int trace_mode)
     internal_function;

/* Check the version dependencies for MAP.  If VERBOSE print some more
   diagnostics.  */
extern int _dl_check_map_versions (struct link_map *map, int verbose,
				   int trace_mode)
     internal_function;

/* Initialize the object in SCOPE by calling the constructors with
   ARGC, ARGV, and ENV as the parameters.  */
extern void _dl_init (struct link_map *main_map, int argc, char **argv,
		      char **env) internal_function attribute_hidden;

/* Call the finalizer functions of all shared objects whose
   initializer functions have completed.  */
extern void _dl_fini (void) internal_function;

/* The dynamic linker calls this function before and having changing
   any shared object mappings.  The `r_state' member of `struct r_debug'
   says what change is taking place.  This function's address is
   the value of the `r_brk' member.  */
extern void _dl_debug_state (void);
rtld_hidden_proto (_dl_debug_state)

/* Initialize `struct r_debug' if it has not already been done.  The
   argument is the run-time load address of the dynamic linker, to be put
   in the `r_ldbase' member.  Returns the address of the structure.  */
extern struct r_debug *_dl_debug_initialize (ElfW(Addr) ldbase, Lmid_t ns)
     internal_function;

/* Initialize the basic data structure for the search paths.  */
extern void _dl_init_paths (const char *library_path) internal_function;

/* Gather the information needed to install the profiling tables and start
   the timers.  */
extern void _dl_start_profile (void) internal_function attribute_hidden;

/* The actual functions used to keep book on the calls.  */
extern void _dl_mcount (ElfW(Addr) frompc, ElfW(Addr) selfpc);
extern void _dl_mcount_internal (ElfW(Addr) frompc, ElfW(Addr) selfpc)
     attribute_hidden;

/* This function is simply a wrapper around the _dl_mcount function
   which does not require a FROMPC parameter since this is the
   calling function.  */
extern void _dl_mcount_wrapper (void *selfpc);

/* Show the members of the auxiliary array passed up from the kernel.  */
extern void _dl_show_auxv (void) internal_function;

/* Return all environment variables starting with `LD_', one after the
   other.  */
extern char *_dl_next_ld_env_entry (char ***position) internal_function;

/* Return an array with the names of the important hardware capabilities.  */
extern const struct r_strlenpair *_dl_important_hwcaps (const char *platform,
							size_t paltform_len,
							size_t *sz,
							size_t *max_capstrlen)
     internal_function;

/* Look up NAME in ld.so.cache and return the file name stored there,
   or null if none is found.  */
extern const char *_dl_load_cache_lookup (const char *name)
     internal_function;

/* If the system does not support MAP_COPY we cannot leave the file open
   all the time since this would create problems when the file is replaced.
   Therefore we provide this function to close the file and open it again
   once needed.  */
extern void _dl_unload_cache (void) attribute_hidden;

/* System-dependent function to read a file's whole contents in the
   most convenient manner available.  *SIZEP gets the size of the
   file.  On error MAP_FAILED is returned.  */
extern void *_dl_sysdep_read_whole_file (const char *file, size_t *sizep,
					 int prot)
     internal_function attribute_hidden;

/* System-specific function to do initial startup for the dynamic linker.
   After this, file access calls and getenv must work.  This is responsible
   for setting __libc_enable_secure if we need to be secure (e.g. setuid),
   and for setting _dl_argc and _dl_argv, and then calling _dl_main.  */
extern ElfW(Addr) _dl_sysdep_start (void **start_argptr,
				    void (*dl_main) (const ElfW(Phdr) *phdr,
						     ElfW(Word) phnum,
						     ElfW(Addr) *user_entry))
     attribute_hidden;

extern void _dl_sysdep_start_cleanup (void)
     internal_function attribute_hidden;


/* Determine next available module ID.  */
extern size_t _dl_next_tls_modid (void) internal_function attribute_hidden;

/* Calculate offset of the TLS blocks in the static TLS block.  */
extern void _dl_determine_tlsoffset (void) internal_function attribute_hidden;

/* Set up the data structures for TLS, when they were not set up at startup.
   Returns nonzero on malloc failure.
   This is called from _dl_map_object_from_fd or by libpthread.  */
extern int _dl_tls_setup (void) internal_function;
rtld_hidden_proto (_dl_tls_setup)

/* Allocate memory for static TLS block (unless MEM is nonzero) and dtv.  */
extern void *_dl_allocate_tls (void *mem) internal_function;
rtld_hidden_proto (_dl_allocate_tls)

/* Get size and alignment requirements of the static TLS block.  */
extern void _dl_get_tls_static_info (size_t *sizep, size_t *alignp)
     internal_function;

extern void _dl_allocate_static_tls (struct link_map *map)
     internal_function attribute_hidden;

/* These are internal entry points to the two halves of _dl_allocate_tls,
   only used within rtld.c itself at startup time.  */
extern void *_dl_allocate_tls_storage (void)
     internal_function attribute_hidden;
extern void *_dl_allocate_tls_init (void *) internal_function;
rtld_hidden_proto (_dl_allocate_tls_init)

/* Deallocate memory allocated with _dl_allocate_tls.  */
extern void _dl_deallocate_tls (void *tcb, bool dealloc_tcb) internal_function;
rtld_hidden_proto (_dl_deallocate_tls)

#if defined USE_TLS
extern void _dl_nothread_init_static_tls (struct link_map *) attribute_hidden;
#endif

/* Find origin of the executable.  */
extern const char *_dl_get_origin (void) attribute_hidden;

/* Count DSTs.  */
extern size_t _dl_dst_count (const char *name, int is_path) attribute_hidden;

/* Substitute DST values.  */
extern char *_dl_dst_substitute (struct link_map *l, const char *name,
				 char *result, int is_path) attribute_hidden;

/* Check validity of the caller.  */
extern int _dl_check_caller (const void *caller, enum allowmask mask)
     attribute_hidden;

/* Open the shared object NAME, relocate it, and run its initializer if it
   hasn't already been run.  MODE is as for `dlopen' (see <dlfcn.h>).  If
   the object is already opened, returns its existing map.  */
extern void *_dl_open (const char *name, int mode, const void *caller,
		       Lmid_t nsid, int argc, char *argv[], char *env[])
     attribute_hidden;

/* Add module to slot information data.  */
extern void _dl_add_to_slotinfo (struct link_map  *l) attribute_hidden;

/* Update slot information data for at least the generation of the
   module with the given index.  */
extern struct link_map *_dl_update_slotinfo (unsigned long int req_modid);

__END_DECLS

#endif /* ldsodefs.h */