aboutsummaryrefslogtreecommitdiff
path: root/bfd/targets.c
blob: f7ad7b0cb7edcc09d01ada6f394a5c9362fa21ca (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
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
/* Generic target-file-type support for the BFD library.
   Copyright 1990, 91, 92, 93, 94, 95, 96, 97, 98, 1999
   Free Software Foundation, Inc.
   Written by Cygnus Support.

This file is part of BFD, the Binary File Descriptor library.

This program 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 2 of the License, or
(at your option) any later version.

This program 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.

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

#include "bfd.h"
#include "sysdep.h"
#include "libbfd.h"
#include "fnmatch.h"

/*
SECTION 
	Targets

DESCRIPTION
	Each port of BFD to a different machine requries the creation
	of a target back end. All the back end provides to the root
	part of BFD is a structure containing pointers to functions
	which perform certain low level operations on files. BFD
	translates the applications's requests through a pointer into
	calls to the back end routines. 

	When a file is opened with <<bfd_openr>>, its format and
	target are unknown. BFD uses various mechanisms to determine
	how to interpret the file. The operations performed are:

	o Create a BFD by calling the internal routine
	<<_bfd_new_bfd>>, then call <<bfd_find_target>> with the
	target string supplied to <<bfd_openr>> and the new BFD pointer. 

	o If a null target string was provided to <<bfd_find_target>>,
	look up the environment variable <<GNUTARGET>> and use
	that as the target string. 

	o If the target string is still <<NULL>>, or the target string is
	<<default>>, then use the first item in the target vector
	as the target type, and set <<target_defaulted>> in the BFD to
	cause <<bfd_check_format>> to loop through all the targets.
	@xref{bfd_target}.  @xref{Formats}.

	o Otherwise, inspect the elements in the target vector
	one by one, until a match on target name is found. When found,
	use it. 

	o Otherwise return the error <<bfd_error_invalid_target>> to
	<<bfd_openr>>.

	o <<bfd_openr>> attempts to open the file using
	<<bfd_open_file>>, and returns the BFD.

	Once the BFD has been opened and the target selected, the file
	format may be determined. This is done by calling
	<<bfd_check_format>> on the BFD with a suggested format. 
	If <<target_defaulted>> has been set, each possible target
	type is tried to see if it recognizes the specified format.
	<<bfd_check_format>> returns <<true>> when the caller guesses right.
@menu
@* bfd_target::
@end menu
*/


/*

INODE
	bfd_target,  , Targets, Targets
DOCDD
SUBSECTION
	bfd_target

DESCRIPTION
	This structure contains everything that BFD knows about a
	target. It includes things like its byte order, name, and which
	routines to call to do various operations.   

	Every BFD points to a target structure with its <<xvec>>
	member. 

	The macros below are used to dispatch to functions through the
	<<bfd_target>> vector. They are used in a number of macros further
	down in @file{bfd.h}, and are also used when calling various
	routines by hand inside the BFD implementation.  The @var{arglist}
	argument must be parenthesized; it contains all the arguments
	to the called function. 

	They make the documentation (more) unpleasant to read, so if
	someone wants to fix this and not break the above, please do.

.#define BFD_SEND(bfd, message, arglist) \
.               ((*((bfd)->xvec->message)) arglist)
.
.#ifdef DEBUG_BFD_SEND
.#undef BFD_SEND
.#define BFD_SEND(bfd, message, arglist) \
.  (((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \
.    ((*((bfd)->xvec->message)) arglist) : \
.    (bfd_assert (__FILE__,__LINE__), NULL))
.#endif

	For operations which index on the BFD format:

.#define BFD_SEND_FMT(bfd, message, arglist) \
.            (((bfd)->xvec->message[(int)((bfd)->format)]) arglist)
.
.#ifdef DEBUG_BFD_SEND
.#undef BFD_SEND_FMT
.#define BFD_SEND_FMT(bfd, message, arglist) \
.  (((bfd) && (bfd)->xvec && (bfd)->xvec->message) ? \
.   (((bfd)->xvec->message[(int)((bfd)->format)]) arglist) : \
.   (bfd_assert (__FILE__,__LINE__), NULL))
.#endif

	This is the structure which defines the type of BFD this is.  The
	<<xvec>> member of the struct <<bfd>> itself points here.  Each
	module that implements access to a different target under BFD,
	defines one of these.


	FIXME, these names should be rationalised with the names of
	the entry points which call them. Too bad we can't have one
	macro to define them both! 

.enum bfd_flavour {
.  bfd_target_unknown_flavour,
.  bfd_target_aout_flavour,
.  bfd_target_coff_flavour,
.  bfd_target_ecoff_flavour,
.  bfd_target_elf_flavour,
.  bfd_target_ieee_flavour,
.  bfd_target_nlm_flavour,
.  bfd_target_oasys_flavour,
.  bfd_target_tekhex_flavour,
.  bfd_target_srec_flavour,
.  bfd_target_ihex_flavour,
.  bfd_target_som_flavour,
.  bfd_target_os9k_flavour,
.  bfd_target_versados_flavour,
.  bfd_target_msdos_flavour,
.  bfd_target_ovax_flavour,
.  bfd_target_evax_flavour
.};
.
.enum bfd_endian { BFD_ENDIAN_BIG, BFD_ENDIAN_LITTLE, BFD_ENDIAN_UNKNOWN };
.
.{* Forward declaration.  *}
.typedef struct bfd_link_info _bfd_link_info;
.
.typedef struct bfd_target
.{

Identifies the kind of target, e.g., SunOS4, Ultrix, etc.

.  char *name;

The "flavour" of a back end is a general indication about the contents
of a file.

.  enum bfd_flavour flavour;

The order of bytes within the data area of a file.

.  enum bfd_endian byteorder;

The order of bytes within the header parts of a file.

.  enum bfd_endian header_byteorder;

A mask of all the flags which an executable may have set -
from the set <<BFD_NO_FLAGS>>, <<HAS_RELOC>>, ...<<D_PAGED>>.

.  flagword object_flags;       

A mask of all the flags which a section may have set - from
the set <<SEC_NO_FLAGS>>, <<SEC_ALLOC>>, ...<<SET_NEVER_LOAD>>.

.  flagword section_flags;

The character normally found at the front of a symbol 
(if any), perhaps `_'.

.  char symbol_leading_char;

The pad character for file names within an archive header.

.  char ar_pad_char;            

The maximum number of characters in an archive header.

.  unsigned short ar_max_namelen;

Entries for byte swapping for data. These are different from the other
entry points, since they don't take a BFD asthe first argument.
Certain other handlers could do the same.

.  bfd_vma      (*bfd_getx64) PARAMS ((const bfd_byte *));
.  bfd_signed_vma (*bfd_getx_signed_64) PARAMS ((const bfd_byte *));
.  void         (*bfd_putx64) PARAMS ((bfd_vma, bfd_byte *));
.  bfd_vma      (*bfd_getx32) PARAMS ((const bfd_byte *));
.  bfd_signed_vma (*bfd_getx_signed_32) PARAMS ((const bfd_byte *));
.  void         (*bfd_putx32) PARAMS ((bfd_vma, bfd_byte *));
.  bfd_vma      (*bfd_getx16) PARAMS ((const bfd_byte *));
.  bfd_signed_vma (*bfd_getx_signed_16) PARAMS ((const bfd_byte *));
.  void         (*bfd_putx16) PARAMS ((bfd_vma, bfd_byte *));

Byte swapping for the headers

.  bfd_vma      (*bfd_h_getx64) PARAMS ((const bfd_byte *));
.  bfd_signed_vma (*bfd_h_getx_signed_64) PARAMS ((const bfd_byte *));
.  void         (*bfd_h_putx64) PARAMS ((bfd_vma, bfd_byte *));
.  bfd_vma      (*bfd_h_getx32) PARAMS ((const bfd_byte *));
.  bfd_signed_vma (*bfd_h_getx_signed_32) PARAMS ((const bfd_byte *));
.  void         (*bfd_h_putx32) PARAMS ((bfd_vma, bfd_byte *));
.  bfd_vma      (*bfd_h_getx16) PARAMS ((const bfd_byte *));
.  bfd_signed_vma (*bfd_h_getx_signed_16) PARAMS ((const bfd_byte *));
.  void         (*bfd_h_putx16) PARAMS ((bfd_vma, bfd_byte *));

Format dependent routines: these are vectors of entry points
within the target vector structure, one for each format to check.

Check the format of a file being read.  Return a <<bfd_target *>> or zero. 

.  const struct bfd_target *(*_bfd_check_format[bfd_type_end]) PARAMS ((bfd *));

Set the format of a file being written.  

.  boolean             (*_bfd_set_format[bfd_type_end]) PARAMS ((bfd *));

Write cached information into a file being written, at <<bfd_close>>. 

.  boolean             (*_bfd_write_contents[bfd_type_end]) PARAMS ((bfd *));

The general target vector.

.
.  {* Generic entry points.  *}
.#define BFD_JUMP_TABLE_GENERIC(NAME)\
.CAT(NAME,_close_and_cleanup),\
.CAT(NAME,_bfd_free_cached_info),\
.CAT(NAME,_new_section_hook),\
.CAT(NAME,_get_section_contents),\
.CAT(NAME,_get_section_contents_in_window)
.
.  {* Called when the BFD is being closed to do any necessary cleanup.  *}
.  boolean       (*_close_and_cleanup) PARAMS ((bfd *));
.  {* Ask the BFD to free all cached information.  *}
.  boolean (*_bfd_free_cached_info) PARAMS ((bfd *));
.  {* Called when a new section is created.  *}
.  boolean       (*_new_section_hook) PARAMS ((bfd *, sec_ptr));
.  {* Read the contents of a section.  *}
.  boolean       (*_bfd_get_section_contents) PARAMS ((bfd *, sec_ptr, PTR, 
.                                            file_ptr, bfd_size_type));
.  boolean       (*_bfd_get_section_contents_in_window)
.                          PARAMS ((bfd *, sec_ptr, bfd_window *,
.                                   file_ptr, bfd_size_type));
.
.  {* Entry points to copy private data.  *}
.#define BFD_JUMP_TABLE_COPY(NAME)\
.CAT(NAME,_bfd_copy_private_bfd_data),\
.CAT(NAME,_bfd_merge_private_bfd_data),\
.CAT(NAME,_bfd_copy_private_section_data),\
.CAT(NAME,_bfd_copy_private_symbol_data),\
.CAT(NAME,_bfd_set_private_flags),\
.CAT(NAME,_bfd_print_private_bfd_data)\
.  {* Called to copy BFD general private data from one object file
.     to another.  *}
.  boolean	 (*_bfd_copy_private_bfd_data) PARAMS ((bfd *, bfd *));
.  {* Called to merge BFD general private data from one object file
.     to a common output file when linking.  *}
.  boolean	 (*_bfd_merge_private_bfd_data) PARAMS ((bfd *, bfd *));
.  {* Called to copy BFD private section data from one object file
.     to another.  *}
.  boolean       (*_bfd_copy_private_section_data) PARAMS ((bfd *, sec_ptr,
.                                                       bfd *, sec_ptr));
.  {* Called to copy BFD private symbol data from one symbol 
.     to another.  *}
.  boolean       (*_bfd_copy_private_symbol_data) PARAMS ((bfd *, asymbol *,
.							   bfd *, asymbol *));
.  {* Called to set private backend flags *}
.  boolean	 (*_bfd_set_private_flags) PARAMS ((bfd *, flagword));
.
.  {* Called to print private BFD data *}
.  boolean       (*_bfd_print_private_bfd_data) PARAMS ((bfd *, PTR));
.
.  {* Core file entry points.  *}
.#define BFD_JUMP_TABLE_CORE(NAME)\
.CAT(NAME,_core_file_failing_command),\
.CAT(NAME,_core_file_failing_signal),\
.CAT(NAME,_core_file_matches_executable_p)
.  char *   (*_core_file_failing_command) PARAMS ((bfd *));
.  int      (*_core_file_failing_signal) PARAMS ((bfd *));
.  boolean  (*_core_file_matches_executable_p) PARAMS ((bfd *, bfd *));
.
.  {* Archive entry points.  *}
.#define BFD_JUMP_TABLE_ARCHIVE(NAME)\
.CAT(NAME,_slurp_armap),\
.CAT(NAME,_slurp_extended_name_table),\
.CAT(NAME,_construct_extended_name_table),\
.CAT(NAME,_truncate_arname),\
.CAT(NAME,_write_armap),\
.CAT(NAME,_read_ar_hdr),\
.CAT(NAME,_openr_next_archived_file),\
.CAT(NAME,_get_elt_at_index),\
.CAT(NAME,_generic_stat_arch_elt),\
.CAT(NAME,_update_armap_timestamp)
.  boolean  (*_bfd_slurp_armap) PARAMS ((bfd *));
.  boolean  (*_bfd_slurp_extended_name_table) PARAMS ((bfd *));
.  boolean  (*_bfd_construct_extended_name_table)
.             PARAMS ((bfd *, char **, bfd_size_type *, const char **));
.  void     (*_bfd_truncate_arname) PARAMS ((bfd *, CONST char *, char *));
.  boolean  (*write_armap) PARAMS ((bfd *arch, 
.                              unsigned int elength,
.                              struct orl *map,
.                              unsigned int orl_count, 
.                              int stridx));
.  PTR (*_bfd_read_ar_hdr_fn) PARAMS ((bfd *));
.  bfd *    (*openr_next_archived_file) PARAMS ((bfd *arch, bfd *prev));
.#define bfd_get_elt_at_index(b,i) BFD_SEND(b, _bfd_get_elt_at_index, (b,i))
.  bfd *    (*_bfd_get_elt_at_index) PARAMS ((bfd *, symindex));
.  int      (*_bfd_stat_arch_elt) PARAMS ((bfd *, struct stat *));
.  boolean  (*_bfd_update_armap_timestamp) PARAMS ((bfd *));
.
.  {* Entry points used for symbols.  *}
.#define BFD_JUMP_TABLE_SYMBOLS(NAME)\
.CAT(NAME,_get_symtab_upper_bound),\
.CAT(NAME,_get_symtab),\
.CAT(NAME,_make_empty_symbol),\
.CAT(NAME,_print_symbol),\
.CAT(NAME,_get_symbol_info),\
.CAT(NAME,_bfd_is_local_label_name),\
.CAT(NAME,_get_lineno),\
.CAT(NAME,_find_nearest_line),\
.CAT(NAME,_bfd_make_debug_symbol),\
.CAT(NAME,_read_minisymbols),\
.CAT(NAME,_minisymbol_to_symbol)
.  long  (*_bfd_get_symtab_upper_bound) PARAMS ((bfd *));
.  long  (*_bfd_canonicalize_symtab) PARAMS ((bfd *,
.                                             struct symbol_cache_entry **));
.  struct symbol_cache_entry  *
.                (*_bfd_make_empty_symbol) PARAMS ((bfd *));
.  void          (*_bfd_print_symbol) PARAMS ((bfd *, PTR,
.                                      struct symbol_cache_entry *,
.                                      bfd_print_symbol_type));
.#define bfd_print_symbol(b,p,s,e) BFD_SEND(b, _bfd_print_symbol, (b,p,s,e))
.  void          (*_bfd_get_symbol_info) PARAMS ((bfd *,
.                                      struct symbol_cache_entry *,
.                                      symbol_info *));
.#define bfd_get_symbol_info(b,p,e) BFD_SEND(b, _bfd_get_symbol_info, (b,p,e))
.  boolean	 (*_bfd_is_local_label_name) PARAMS ((bfd *, const char *));
.
.  alent *    (*_get_lineno) PARAMS ((bfd *, struct symbol_cache_entry *));
.  boolean    (*_bfd_find_nearest_line) PARAMS ((bfd *abfd,
.                    struct sec *section, struct symbol_cache_entry **symbols,
.                    bfd_vma offset, CONST char **file, CONST char **func,
.                    unsigned int *line));
. {* Back-door to allow format-aware applications to create debug symbols
.    while using BFD for everything else.  Currently used by the assembler
.    when creating COFF files.  *}
.  asymbol *  (*_bfd_make_debug_symbol) PARAMS ((
.       bfd *abfd,
.       void *ptr,
.       unsigned long size));
.#define bfd_read_minisymbols(b, d, m, s) \
.  BFD_SEND (b, _read_minisymbols, (b, d, m, s))
.  long  (*_read_minisymbols) PARAMS ((bfd *, boolean, PTR *,
.                                      unsigned int *));
.#define bfd_minisymbol_to_symbol(b, d, m, f) \
.  BFD_SEND (b, _minisymbol_to_symbol, (b, d, m, f))
.  asymbol *(*_minisymbol_to_symbol) PARAMS ((bfd *, boolean, const PTR,
.                                             asymbol *));
.
.  {* Routines for relocs.  *}
.#define BFD_JUMP_TABLE_RELOCS(NAME)\
.CAT(NAME,_get_reloc_upper_bound),\
.CAT(NAME,_canonicalize_reloc),\
.CAT(NAME,_bfd_reloc_type_lookup)
.  long  (*_get_reloc_upper_bound) PARAMS ((bfd *, sec_ptr));
.  long  (*_bfd_canonicalize_reloc) PARAMS ((bfd *, sec_ptr, arelent **,
.                                            struct symbol_cache_entry **));
.  {* See documentation on reloc types.  *}
.  reloc_howto_type *
.       (*reloc_type_lookup) PARAMS ((bfd *abfd,
.                                     bfd_reloc_code_real_type code));
.
.  {* Routines used when writing an object file.  *}
.#define BFD_JUMP_TABLE_WRITE(NAME)\
.CAT(NAME,_set_arch_mach),\
.CAT(NAME,_set_section_contents)
.  boolean    (*_bfd_set_arch_mach) PARAMS ((bfd *, enum bfd_architecture,
.                    unsigned long));
.  boolean       (*_bfd_set_section_contents) PARAMS ((bfd *, sec_ptr, PTR,
.                                            file_ptr, bfd_size_type));
.
.  {* Routines used by the linker.  *}
.#define BFD_JUMP_TABLE_LINK(NAME)\
.CAT(NAME,_sizeof_headers),\
.CAT(NAME,_bfd_get_relocated_section_contents),\
.CAT(NAME,_bfd_relax_section),\
.CAT(NAME,_bfd_link_hash_table_create),\
.CAT(NAME,_bfd_link_add_symbols),\
.CAT(NAME,_bfd_final_link),\
.CAT(NAME,_bfd_link_split_section),\
.CAT(NAME,_bfd_gc_sections)
.  int        (*_bfd_sizeof_headers) PARAMS ((bfd *, boolean));
.  bfd_byte * (*_bfd_get_relocated_section_contents) PARAMS ((bfd *,
.                    struct bfd_link_info *, struct bfd_link_order *,
.                    bfd_byte *data, boolean relocateable,
.                    struct symbol_cache_entry **));
.
.  boolean    (*_bfd_relax_section) PARAMS ((bfd *, struct sec *,
.                    struct bfd_link_info *, boolean *again));
.
.  {* Create a hash table for the linker.  Different backends store
.     different information in this table.  *}
.  struct bfd_link_hash_table *(*_bfd_link_hash_table_create) PARAMS ((bfd *));
.
.  {* Add symbols from this object file into the hash table.  *}
.  boolean (*_bfd_link_add_symbols) PARAMS ((bfd *, struct bfd_link_info *));
.
.  {* Do a link based on the link_order structures attached to each
.     section of the BFD.  *}
.  boolean (*_bfd_final_link) PARAMS ((bfd *, struct bfd_link_info *));
.
.  {* Should this section be split up into smaller pieces during linking.  *}
.  boolean (*_bfd_link_split_section) PARAMS ((bfd *, struct sec *));
.
.  {* Remove sections that are not referenced from the output.  *}
.  boolean (*_bfd_gc_sections) PARAMS ((bfd *, struct bfd_link_info *));
.
.  {* Routines to handle dynamic symbols and relocs.  *}
.#define BFD_JUMP_TABLE_DYNAMIC(NAME)\
.CAT(NAME,_get_dynamic_symtab_upper_bound),\
.CAT(NAME,_canonicalize_dynamic_symtab),\
.CAT(NAME,_get_dynamic_reloc_upper_bound),\
.CAT(NAME,_canonicalize_dynamic_reloc)
.  {* Get the amount of memory required to hold the dynamic symbols. *}
.  long  (*_bfd_get_dynamic_symtab_upper_bound) PARAMS ((bfd *));
.  {* Read in the dynamic symbols.  *}
.  long  (*_bfd_canonicalize_dynamic_symtab)
.    PARAMS ((bfd *, struct symbol_cache_entry **));
.  {* Get the amount of memory required to hold the dynamic relocs.  *}
.  long  (*_bfd_get_dynamic_reloc_upper_bound) PARAMS ((bfd *));
.  {* Read in the dynamic relocs.  *}
.  long  (*_bfd_canonicalize_dynamic_reloc)
.    PARAMS ((bfd *, arelent **, struct symbol_cache_entry **));
.

A pointer to an alternative bfd_target in case the current one is not
satisfactory.  This can happen when the target cpu supports both big
and little endian code, and target chosen by the linker has the wrong
endianness.  The function open_output() in ld/ldlang.c uses this field
to find an alternative output format that is suitable.

. {* Opposite endian version of this target.  *}  
. const struct bfd_target * alternative_target;
. 

Data for use by back-end routines, which isn't generic enough to belong
in this structure.

. PTR backend_data;
. 
.} bfd_target;

*/

/* All known xvecs (even those that don't compile on all systems).
   Alphabetized for easy reference.
   They are listed a second time below, since
   we can't intermix extern's and initializers.  */
extern const bfd_target a29kcoff_big_vec;
extern const bfd_target a_out_adobe_vec;
extern const bfd_target aout_arm_big_vec;
extern const bfd_target aout_arm_little_vec;
extern const bfd_target aout_mips_big_vec;
extern const bfd_target aout_mips_little_vec;
extern const bfd_target aout0_big_vec;
extern const bfd_target apollocoff_vec;
extern const bfd_target armcoff_little_vec;
extern const bfd_target armcoff_big_vec;
extern const bfd_target armpe_little_vec;
extern const bfd_target armpe_big_vec;
extern const bfd_target armpei_little_vec;
extern const bfd_target armpei_big_vec;
extern const bfd_target arm_epoc_pe_little_vec;
extern const bfd_target arm_epoc_pe_big_vec;
extern const bfd_target arm_epoc_pei_little_vec;
extern const bfd_target arm_epoc_pei_big_vec;
extern const bfd_target b_out_vec_big_host;
extern const bfd_target b_out_vec_little_host;
extern const bfd_target bfd_elf64_alpha_vec;
extern const bfd_target bfd_elf32_bigarc_vec;
extern const bfd_target bfd_elf32_bigarm_vec;
extern const bfd_target bfd_elf32_bigarm_oabi_vec;
extern const bfd_target bfd_elf32_littlearc_vec;
extern const bfd_target bfd_elf32_littlearm_vec;
extern const bfd_target bfd_elf32_littlearm_oabi_vec;
extern const bfd_target bfd_elf32_big_generic_vec;
extern const bfd_target bfd_elf32_bigmips_vec;
extern const bfd_target bfd_elf64_bigmips_vec;
extern const bfd_target bfd_elf32_d10v_vec;
extern const bfd_target bfd_elf32_d30v_vec;
extern const bfd_target bfd_elf32_hppa_vec;
extern const bfd_target bfd_elf32_i386_vec;
extern const bfd_target bfd_elf32_i860_vec;
extern const bfd_target bfd_elf32_i960_vec;
extern const bfd_target bfd_elf32_little_generic_vec;
extern const bfd_target bfd_elf32_littlemips_vec;
extern const bfd_target bfd_elf64_littlemips_vec;
extern const bfd_target bfd_elf32_m32r_vec;
extern const bfd_target bfd_elf32_m68k_vec;
extern const bfd_target bfd_elf32_m88k_vec;
extern const bfd_target bfd_elf32_mn10200_vec;
extern const bfd_target bfd_elf32_mn10300_vec;
extern const bfd_target bfd_elf32_powerpc_vec;
extern const bfd_target bfd_elf32_powerpcle_vec;
extern const bfd_target bfd_elf32_sh_vec;
extern const bfd_target bfd_elf32_shl_vec;
extern const bfd_target bfd_elf32_sparc_vec;
extern const bfd_target bfd_elf32_v850_vec;
extern const bfd_target bfd_elf32_fr30_vec;
extern const bfd_target bfd_elf32_mcore_big_vec;
extern const bfd_target bfd_elf32_mcore_little_vec;
extern const bfd_target bfd_elf64_big_generic_vec;
extern const bfd_target bfd_elf64_little_generic_vec;
extern const bfd_target bfd_elf64_sparc_vec;
extern const bfd_target demo_64_vec;
extern const bfd_target ecoff_big_vec;
extern const bfd_target ecoff_little_vec;
extern const bfd_target ecoff_biglittle_vec;
extern const bfd_target ecoffalpha_little_vec;
extern const bfd_target h8300coff_vec;
extern const bfd_target h8500coff_vec;
extern const bfd_target host_aout_vec;
extern const bfd_target hp300bsd_vec;
extern const bfd_target hp300hpux_vec;
extern const bfd_target som_vec;
extern const bfd_target i386aout_vec;
extern const bfd_target i386bsd_vec;
extern const bfd_target i386dynix_vec;
extern const bfd_target i386freebsd_vec;
extern const bfd_target i386os9k_vec;
extern const bfd_target i386coff_vec;
extern const bfd_target bfd_powerpc_pe_vec;
extern const bfd_target bfd_powerpcle_pe_vec;
extern const bfd_target bfd_powerpc_pei_vec;
extern const bfd_target bfd_powerpcle_pei_vec;
extern const bfd_target i386pe_vec;
extern const bfd_target i386pei_vec;
extern const bfd_target go32coff_vec;
extern const bfd_target go32stubbedcoff_vec;
extern const bfd_target i386linux_vec;
extern const bfd_target i386lynx_aout_vec;
extern const bfd_target i386lynx_coff_vec;
extern const bfd_target i386mach3_vec;
extern const bfd_target i386msdos_vec;
extern const bfd_target i386netbsd_vec;
extern const bfd_target i860coff_vec;
extern const bfd_target icoff_big_vec;
extern const bfd_target icoff_little_vec;
extern const bfd_target ieee_vec;
extern const bfd_target m68kaux_coff_vec;
extern const bfd_target m68kcoff_vec;
extern const bfd_target m68kcoffun_vec;
extern const bfd_target m68klinux_vec;
extern const bfd_target m68klynx_aout_vec;
extern const bfd_target m68klynx_coff_vec;
extern const bfd_target m68knetbsd_vec;
extern const bfd_target m68ksysvcoff_vec;
extern const bfd_target m68k4knetbsd_vec;
extern const bfd_target m88kbcs_vec;
extern const bfd_target m88kmach3_vec;
extern const bfd_target mcore_pe_big_vec;
extern const bfd_target mcore_pe_little_vec;
extern const bfd_target mcore_pei_big_vec;
extern const bfd_target mcore_pei_little_vec;
extern const bfd_target newsos3_vec;
extern const bfd_target nlm32_i386_vec;
extern const bfd_target nlm32_sparc_vec;
extern const bfd_target nlm32_alpha_vec;
extern const bfd_target nlm32_powerpc_vec;
extern const bfd_target pc532netbsd_vec;
extern const bfd_target oasys_vec;
extern const bfd_target pc532machaout_vec;
extern const bfd_target ppcboot_vec;
extern const bfd_target riscix_vec;
extern const bfd_target pmac_xcoff_vec;
extern const bfd_target rs6000coff_vec;
extern const bfd_target shcoff_vec;
extern const bfd_target shlcoff_vec;
extern const bfd_target shcoff_small_vec;
extern const bfd_target shlcoff_small_vec;
extern const bfd_target sparcle_aout_vec;
extern const bfd_target sparclinux_vec;
extern const bfd_target sparclynx_aout_vec;
extern const bfd_target sparclynx_coff_vec;
extern const bfd_target sparcnetbsd_vec;
extern const bfd_target sparccoff_vec;
extern const bfd_target sunos_big_vec;
extern const bfd_target tekhex_vec;
extern const bfd_target tic30_aout_vec;
extern const bfd_target tic30_coff_vec;
extern const bfd_target tic80coff_vec;
extern const bfd_target vaxnetbsd_vec;
extern const bfd_target versados_vec;
extern const bfd_target vms_alpha_vec;
extern const bfd_target vms_vax_vec;
extern const bfd_target we32kcoff_vec;
extern const bfd_target w65_vec;
extern const bfd_target z8kcoff_vec;

/* srec is always included.  */
extern const bfd_target srec_vec;
extern const bfd_target symbolsrec_vec;

/* binary is always included.  */
extern const bfd_target binary_vec;

/* ihex is always included.  */
extern const bfd_target ihex_vec;

/* All of the xvecs for core files.  */
extern const bfd_target aix386_core_vec;
extern const bfd_target cisco_core_vec;
extern const bfd_target hpux_core_vec;
extern const bfd_target hppabsd_core_vec;
extern const bfd_target irix_core_vec;
extern const bfd_target netbsd_core_vec;
extern const bfd_target osf_core_vec;
extern const bfd_target sco5_core_vec;
extern const bfd_target trad_core_vec;
extern const bfd_target ptrace_core_vec;

const bfd_target * const bfd_target_vector[] = {

#ifdef SELECT_VECS

	SELECT_VECS,

#else /* not SELECT_VECS */

#ifdef DEFAULT_VECTOR
	&DEFAULT_VECTOR,
#endif
	/* This list is alphabetized to make it easy to compare
	   with other vector lists -- the decls above and
	   the case statement in configure.in.
	   Vectors that don't compile on all systems, or aren't finished,
	   should have an entry here with #if 0 around it, to show that
	   it wasn't omitted by mistake.  */
	&a29kcoff_big_vec,
	&a_out_adobe_vec,
#if 0				/* No one seems to use this.  */
	&aout_mips_big_vec,
#endif
	&aout_mips_little_vec,
	&b_out_vec_big_host,
	&b_out_vec_little_host,

	/* This, and other vectors, may not be used in any *.mt configuration.
	   But that does not mean they are unnecessary.  If configured with
	   --enable-targets=all, objdump or gdb should be able to examine
	   the file even if we don't recognize the machine type.  */
	&bfd_elf32_big_generic_vec,
#ifdef BFD64
	&bfd_elf64_alpha_vec,
#endif
	&bfd_elf32_bigarc_vec,
        &bfd_elf32_bigarm_vec,
        &bfd_elf32_bigarm_oabi_vec,
	&bfd_elf32_bigmips_vec,
#ifdef BFD64
	&bfd_elf64_bigmips_vec,
#endif
	&bfd_elf32_d10v_vec,
	&bfd_elf32_d30v_vec,
	&bfd_elf32_hppa_vec,
	&bfd_elf32_i386_vec,
	&bfd_elf32_i860_vec,
	&bfd_elf32_i960_vec,
	&bfd_elf32_little_generic_vec,
	&bfd_elf32_littlearc_vec,
        &bfd_elf32_littlearm_vec,
        &bfd_elf32_littlearm_oabi_vec,
	&bfd_elf32_littlemips_vec,
#ifdef BFD64
	&bfd_elf64_littlemips_vec,
#endif
	&bfd_elf32_m32r_vec,
	&bfd_elf32_mn10200_vec,
	&bfd_elf32_mn10300_vec,
	&bfd_elf32_m68k_vec,
	&bfd_elf32_m88k_vec,
	&bfd_elf32_sparc_vec,
	&bfd_elf32_powerpc_vec,
	&bfd_elf32_powerpcle_vec,
	&bfd_elf32_v850_vec,
	&bfd_elf32_fr30_vec,
	&bfd_elf32_mcore_big_vec,
	&bfd_elf32_mcore_little_vec,
#ifdef BFD64			/* No one seems to use this.  */
	&bfd_elf64_big_generic_vec,
	&bfd_elf64_little_generic_vec,
#endif
#if 0
	&bfd_elf64_sparc_vec,
#endif
	/* We don't include cisco_core_vec.  Although it has a magic number,
	   the magic number isn't at the beginning of the file, and thus
	   might spuriously match other kinds of files.  */
#ifdef BFD64
	&demo_64_vec,	/* Only compiled if host has long-long support */
#endif
	&ecoff_big_vec,
	&ecoff_little_vec,
	&ecoff_biglittle_vec,
#ifdef BFD64
	&ecoffalpha_little_vec,
#endif
	&h8300coff_vec,
	&h8500coff_vec,
#if 0
	/* Since a.out files lack decent magic numbers, no way to recognize
	   which kind of a.out file it is.  */
	&host_aout_vec,
#endif
#if 0				/* Clashes with sunos_big_vec magic no.  */
	&hp300bsd_vec,
#endif
	&hp300hpux_vec,
#if defined (HOST_HPPAHPUX) || defined (HOST_HPPABSD) || defined (HOST_HPPAOSF)
        &som_vec,
#endif
	&i386aout_vec,
	&i386bsd_vec,
	&i386coff_vec,
	&i386freebsd_vec,
	&i860coff_vec,
	&bfd_powerpc_pe_vec,
	&bfd_powerpcle_pe_vec,
	&bfd_powerpc_pei_vec,
	&bfd_powerpcle_pei_vec,
	&go32coff_vec,
	&go32stubbedcoff_vec,
#if 0
	/* Since a.out files lack decent magic numbers, no way to recognize
	   which kind of a.out file it is.  */
	&i386linux_vec,
#endif
	&i386lynx_aout_vec,
	&i386lynx_coff_vec,
#if 0
	/* No distinguishing features for Mach 3 executables.  */
	&i386mach3_vec,
#endif
	&i386msdos_vec,
	&i386netbsd_vec,
	&i386os9k_vec,
	&i386pe_vec,
	&i386pei_vec,
	&armcoff_little_vec,
	&armcoff_big_vec,
	&armpe_little_vec,
	&armpe_big_vec,
	&armpei_little_vec,
	&armpei_big_vec,
	&arm_epoc_pe_little_vec,
	&arm_epoc_pe_big_vec,
	&arm_epoc_pei_little_vec,
	&arm_epoc_pei_big_vec,
	&icoff_big_vec,
	&icoff_little_vec,
	&ieee_vec,
	&m68kcoff_vec,
	&m68kcoffun_vec,
#if 0
	/* Since a.out files lack decent magic numbers, no way to recognize
	   which kind of a.out file it is.  */
	&m68klinux_vec,
#endif
	&m68klynx_aout_vec,
	&m68klynx_coff_vec,
	&m68knetbsd_vec,
	&m68ksysvcoff_vec,
	&m88kbcs_vec,
	&m88kmach3_vec,
	&mcore_pe_big_vec,
	&mcore_pe_little_vec,
	&mcore_pei_big_vec,
	&mcore_pei_little_vec,
	&newsos3_vec,
	&nlm32_i386_vec,
	&nlm32_sparc_vec,
#ifdef BFD64
	&nlm32_alpha_vec,
#endif
	&pc532netbsd_vec,
#if 0
	/* We have no oasys tools anymore, so we can't test any of this
	   anymore. If you want to test the stuff yourself, go ahead...
	   steve@cygnus.com
	   Worse, since there is no magic number for archives, there
	   can be annoying target mis-matches.  */
	&oasys_vec,
#endif
	&pc532machaout_vec,
#if 0
	/* We have no way of distinguishing these from other a.out variants */
	&aout_arm_big_vec,
	&aout_arm_little_vec,
	&riscix_vec,
#endif
#if 0
	/* This has the same magic number as RS/6000. */
	&pmac_xcoff_vec,
#endif
	&rs6000coff_vec,
	&ppcboot_vec,
	&shcoff_vec,
	&shlcoff_vec,
	&shcoff_small_vec,
	&shlcoff_small_vec,
	&sparcle_aout_vec,
	&sparclinux_vec,
	&sparclynx_aout_vec,
	&sparclynx_coff_vec,
	&sparcnetbsd_vec,
	&sunos_big_vec,
	&aout0_big_vec,
	&tic30_aout_vec,
	&tic30_coff_vec,
	&tic80coff_vec,
	&vaxnetbsd_vec,
	&versados_vec,
#ifdef BFD64
	&vms_alpha_vec,
#endif
	&vms_vax_vec,
	&we32kcoff_vec,
	&z8kcoff_vec,

#endif /* not SELECT_VECS */

/* Always support S-records, for convenience.  */
	&srec_vec,
	&symbolsrec_vec,
/* And tekhex */
	&tekhex_vec,
/* Likewise for binary output.  */
	&binary_vec,
/* Likewise for ihex.  */
	&ihex_vec,

/* Add any required traditional-core-file-handler.  */

#ifdef AIX386_CORE
	&aix386_core_vec,
#endif
#ifdef HPUX_CORE
	&hpux_core_vec,
#endif
#ifdef HPPABSD_CORE
	&hppabsd_core_vec,
#endif
#ifdef IRIX_CORE
	&irix_core_vec,
#endif
#ifdef NETBSD_CORE
	&netbsd_core_vec,
#endif
#ifdef OSF_CORE
	&osf_core_vec,
#endif
#ifdef SCO5_CORE
	&sco5_core_vec,
#endif
#ifdef	TRAD_CORE
	&trad_core_vec,
#endif

#ifdef	PTRACE_CORE
	&ptrace_core_vec,
#endif

	NULL /* end of list marker */
};

/* bfd_default_vector[0] contains either the address of the default vector,
   if there is one, or zero if there isn't.  */

const bfd_target *bfd_default_vector[] = {
#ifdef DEFAULT_VECTOR
	&DEFAULT_VECTOR,
#endif
	NULL
};

/* When there is an ambiguous match, bfd_check_format_matches puts the
   names of the matching targets in an array.  This variable is the maximum
   number of entries that the array could possibly need.  */
const size_t _bfd_target_vector_entries = sizeof(bfd_target_vector)/sizeof(*bfd_target_vector);

/* This array maps configuration triplets onto BFD vectors.  */

struct targmatch
{
  /* The configuration triplet.  */
  const char *triplet;
  /* The BFD vector.  If this is NULL, then the vector is found by
     searching forward for the next structure with a non NULL vector
     field.  */
  const bfd_target *vector;
};

/* targmatch.h is built by Makefile out of config.bfd.  */
static const struct targmatch bfd_target_match[] = {
#include "targmatch.h"
  { NULL, NULL }
};

static const bfd_target *find_target PARAMS ((const char *));

/* Find a target vector, given a name or configuration triplet.  */

static const bfd_target *
find_target (name)
     const char *name;
{
  const bfd_target * const *target;
  const struct targmatch *match;

  for (target = &bfd_target_vector[0]; *target != NULL; target++)
    if (strcmp (name, (*target)->name) == 0)
      return *target;

  /* If we couldn't match on the exact name, try matching on the
     configuration triplet.  FIXME: We should run the triplet through
     config.sub first, but that is hard.  */
  for (match = &bfd_target_match[0]; match->triplet != NULL; match++)
    {
      if (fnmatch (match->triplet, name, 0) == 0)
	{
	  while (match->vector == NULL)
	    ++match;
	  return match->vector;
	  break;
	}
    }

  bfd_set_error (bfd_error_invalid_target);
  return NULL;
}

/*
FUNCTION
	bfd_set_default_target

SYNOPSIS
	boolean bfd_set_default_target (const char *name);

DESCRIPTION
	Set the default target vector to use when recognizing a BFD.
	This takes the name of the target, which may be a BFD target
	name or a configuration triplet.
*/

boolean
bfd_set_default_target (name)
     const char *name;
{
  const bfd_target *target;

  if (bfd_default_vector[0] != NULL
      && strcmp (name, bfd_default_vector[0]->name) == 0)
    return true;

  target = find_target (name);
  if (target == NULL)
    return false;

  bfd_default_vector[0] = target;
  return true;
}

/*
FUNCTION
	bfd_find_target

SYNOPSIS
	const bfd_target *bfd_find_target(CONST char *target_name, bfd *abfd);

DESCRIPTION
	Return a pointer to the transfer vector for the object target
	named @var{target_name}.  If @var{target_name} is <<NULL>>, choose the
	one in the environment variable <<GNUTARGET>>; if that is null or not
	defined, then choose the first entry in the target list.
	Passing in the string "default" or setting the environment
	variable to "default" will cause the first entry in the target
	list to be returned, and "target_defaulted" will be set in the
	BFD.  This causes <<bfd_check_format>> to loop over all the
	targets to find the one that matches the file being read.   
*/

const bfd_target *
bfd_find_target (target_name, abfd)
     const char *target_name;
     bfd *abfd;
{
  const char *targname;
  const bfd_target *target;

  if (target_name != NULL)
    targname = target_name;
  else
    targname = getenv ("GNUTARGET");

  /* This is safe; the vector cannot be null */
  if (targname == NULL || strcmp (targname, "default") == 0)
    {
      abfd->target_defaulted = true;
      if (bfd_default_vector[0] != NULL)
	abfd->xvec = bfd_default_vector[0];
      else
	abfd->xvec = bfd_target_vector[0];
      return abfd->xvec;
    }

  abfd->target_defaulted = false;

  target = find_target (targname);
  if (target == NULL)
    return NULL;

  abfd->xvec = target;
  return target;
}

/*
FUNCTION
	bfd_target_list

SYNOPSIS
	const char **bfd_target_list(void);

DESCRIPTION
	Return a freshly malloced NULL-terminated
	vector of the names of all the valid BFD targets. Do not
	modify the names.

*/

const char **
bfd_target_list ()
{
  int vec_length= 0;
#if defined (HOST_HPPAHPUX) && ! defined (__STDC__)
  /* The native compiler on the HP9000/700 has a bug which causes it
     to loop endlessly when compiling this file.  This avoids it.  */
  volatile
#endif
    const bfd_target * const *target;
  CONST  char **name_list, **name_ptr;

  for (target = &bfd_target_vector[0]; *target != NULL; target++)
    vec_length++;

  name_ptr = name_list = (CONST char **)
    bfd_zmalloc ((vec_length + 1) * sizeof (char **));

  if (name_list == NULL)
    return NULL;

  for (target = &bfd_target_vector[0]; *target != NULL; target++)
    *(name_ptr++) = (*target)->name;

  return name_list;
}

/*
FUNCTION
	bfd_seach_for_target

SYNOPSIS
	const bfd_target * bfd_search_for_target (int (* search_func)(const bfd_target *, void *), void *);

DESCRIPTION
	Return a pointer to the first transfer vector in the list of
	transfer vectors maintained by BFD that produces a non-zero
	result when passed to the function @var{search_func}.  The
	parameter @var{data} is passed, unexamined, to the search
	function.
*/

const bfd_target *
bfd_search_for_target (search_func, data)
     int (* search_func) PARAMS ((const bfd_target * target, void * data));
     void * data;
{
  const bfd_target * const * target;

  for (target = bfd_target_vector; * target != NULL; target ++)
    if (search_func (* target, data))
      return * target;

  return NULL;
}