1
/* BFD COFF object file private structure.
2
Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
3
2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4
Free Software Foundation, Inc.
5
Written by Cygnus Support.
7
This file is part of BFD, the Binary File Descriptor library.
9
This program is free software; you can redistribute it and/or modify
10
it under the terms of the GNU General Public License as published by
11
the Free Software Foundation; either version 3 of the License, or
12
(at your option) any later version.
14
This program is distributed in the hope that it will be useful,
15
but WITHOUT ANY WARRANTY; without even the implied warranty of
16
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17
GNU General Public License for more details.
19
You should have received a copy of the GNU General Public License
20
along with this program; if not, write to the Free Software
21
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22
MA 02110-1301, USA. */
26
/* Object file tdata; access macros. */
28
#define coff_data(bfd) ((bfd)->tdata.coff_obj_data)
29
#define obj_pe(bfd) (coff_data (bfd)->pe)
30
#define obj_symbols(bfd) (coff_data (bfd)->symbols)
31
#define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos)
32
#define obj_relocbase(bfd) (coff_data (bfd)->relocbase)
33
#define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments)
34
#define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count)
35
#define obj_convert(bfd) (coff_data (bfd)->conversion_table)
36
#define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size)
37
#define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms)
38
#define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms)
39
#define obj_coff_strings(bfd) (coff_data (bfd)->strings)
40
#define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings)
41
#define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes)
42
#define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
43
#define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
45
/* `Tdata' information kept for COFF files. */
47
typedef struct coff_tdata
49
struct coff_symbol_struct *symbols; /* Symtab for input bfd. */
50
unsigned int *conversion_table;
54
struct coff_ptr_struct *raw_syments;
55
unsigned long raw_syment_count;
57
/* These are only valid once writing has begun. */
60
/* These members communicate important constants about the symbol table
61
to GDB's symbol-reading code. These `constants' unfortunately vary
62
from coff implementation to implementation... */
63
unsigned local_n_btmask;
64
unsigned local_n_btshft;
65
unsigned local_n_tmask;
66
unsigned local_n_tshift;
67
unsigned local_symesz;
68
unsigned local_auxesz;
69
unsigned local_linesz;
71
/* The unswapped external symbols. May be NULL. Read by
72
_bfd_coff_get_external_symbols. */
74
/* If this is TRUE, the external_syms may not be freed. */
75
bfd_boolean keep_syms;
77
/* The string table. May be NULL. Read by
78
_bfd_coff_read_string_table. */
80
/* If this is TRUE, the strings may not be freed. */
81
bfd_boolean keep_strings;
82
/* If this is TRUE, the strings have been written out already. */
83
bfd_boolean strings_written;
85
/* Is this a PE format coff file? */
87
/* Used by the COFF backend linker. */
88
struct coff_link_hash_entry **sym_hashes;
90
/* Used by the pe linker for PowerPC. */
91
int *local_toc_sym_map;
93
struct bfd_link_info *link_info;
95
/* Used by coff_find_nearest_line. */
98
/* A place to stash dwarf2 info for this bfd. */
99
void * dwarf2_find_line_info;
101
/* The timestamp from the COFF file header. */
104
/* Copy of some of the f_flags bits in the COFF filehdr structure,
108
/* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data
109
is kept in internal_filehdr.go32stub beforehand. */
113
/* Tdata for pe image files. */
114
typedef struct pe_tdata
117
struct internal_extra_pe_aouthdr pe_opthdr;
119
int has_reloc_section;
120
int dont_strip_reloc;
121
bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *);
125
#define pe_data(bfd) ((bfd)->tdata.pe_obj_data)
127
/* Tdata for XCOFF files. */
131
/* Basic COFF information. */
134
/* TRUE if this is an XCOFF64 file. */
137
/* TRUE if a large a.out header should be generated. */
138
bfd_boolean full_aouthdr;
143
/* Index of section holding TOC. */
146
/* Index of section holding entry point. */
149
/* .text alignment from optional header. */
150
int text_align_power;
152
/* .data alignment from optional header. */
153
int data_align_power;
155
/* modtype from optional header. */
158
/* cputype from optional header. */
161
/* maxdata from optional header. */
164
/* maxstack from optional header. */
167
/* Used by the XCOFF backend linker. */
170
unsigned int *lineno_counts;
171
unsigned int import_file_id;
174
#define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
176
/* We take the address of the first element of an asymbol to ensure that the
177
macro is only ever applied to an asymbol. */
178
#define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
180
/* The used_by_bfd field of a section may be set to a pointer to this
183
struct coff_section_tdata
185
/* The relocs, swapped into COFF internal form. This may be NULL. */
186
struct internal_reloc *relocs;
187
/* If this is TRUE, the relocs entry may not be freed. */
188
bfd_boolean keep_relocs;
189
/* The section contents. This may be NULL. */
191
/* If this is TRUE, the contents entry may not be freed. */
192
bfd_boolean keep_contents;
193
/* Information cached by coff_find_nearest_line. */
196
const char *function;
197
/* Optional information about a COMDAT entry; NULL if not COMDAT. */
198
struct coff_comdat_info *comdat;
200
/* A pointer used for .stab linking optimizations. */
202
/* Available for individual backends. */
206
/* An accessor macro for the coff_section_tdata structure. */
207
#define coff_section_data(abfd, sec) \
208
((struct coff_section_tdata *) (sec)->used_by_bfd)
210
/* Tdata for sections in XCOFF files. This is used by the linker. */
212
struct xcoff_section_tdata
214
/* Used for XCOFF csects created by the linker; points to the real
215
XCOFF section which contains this csect. */
217
/* The lineno_count field for the enclosing section, because we are
218
going to clobber it there. */
219
unsigned int lineno_count;
220
/* The first and last symbol indices for symbols used by this csect. */
221
unsigned long first_symndx;
222
unsigned long last_symndx;
225
/* An accessor macro the xcoff_section_tdata structure. */
226
#define xcoff_section_data(abfd, sec) \
227
((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
229
/* Tdata for sections in PE files. */
231
struct pei_section_tdata
233
/* The virtual size of the section. */
234
bfd_size_type virt_size;
235
/* The PE section flags. */
239
/* An accessor macro for the pei_section_tdata structure. */
240
#define pei_section_data(abfd, sec) \
241
((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
243
/* COFF linker hash table entries. */
245
struct coff_link_hash_entry
247
struct bfd_link_hash_entry root;
249
/* Symbol index in output file. Set to -1 initially. Set to -2 if
250
there is a reloc against this symbol. */
257
unsigned char symbol_class;
259
/* Number of auxiliary entries. */
262
/* BFD to take auxiliary entries from. */
265
/* Pointer to array of auxiliary entries, if any. */
266
union internal_auxent *aux;
268
/* Flag word; legal values follow. */
269
unsigned short coff_link_hash_flags;
270
/* Symbol is a PE section symbol. */
271
#define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
274
/* COFF linker hash table. */
276
struct coff_link_hash_table
278
struct bfd_link_hash_table root;
279
/* A pointer to information used to link stabs in sections. */
280
struct stab_info stab_info;
283
/* Look up an entry in a COFF linker hash table. */
285
#define coff_link_hash_lookup(table, string, create, copy, follow) \
286
((struct coff_link_hash_entry *) \
287
bfd_link_hash_lookup (&(table)->root, (string), (create), \
290
/* Traverse a COFF linker hash table. */
292
#define coff_link_hash_traverse(table, func, info) \
293
(bfd_link_hash_traverse \
295
(bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
298
/* Get the COFF linker hash table from a link_info structure. */
300
#define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
302
/* Functions in coffgen.c. */
303
extern const bfd_target *coff_object_p
305
extern struct bfd_section *coff_section_from_bfd_index
307
extern long coff_get_symtab_upper_bound
309
extern long coff_canonicalize_symtab
311
extern int coff_count_linenumbers
313
extern struct coff_symbol_struct *coff_symbol_from
315
extern bfd_boolean coff_renumber_symbols
317
extern void coff_mangle_symbols
319
extern bfd_boolean coff_write_symbols
321
extern bfd_boolean coff_write_alien_symbol
322
(bfd *, asymbol *, struct internal_syment *, bfd_vma *,
323
bfd_size_type *, asection **, bfd_size_type *);
324
extern bfd_boolean coff_write_linenumbers
326
extern alent *coff_get_lineno
328
extern asymbol *coff_section_symbol
330
extern bfd_boolean _bfd_coff_get_external_symbols
332
extern const char *_bfd_coff_read_string_table
334
extern bfd_boolean _bfd_coff_free_symbols
336
extern struct coff_ptr_struct *coff_get_normalized_symtab
338
extern long coff_get_reloc_upper_bound
340
extern asymbol *coff_make_empty_symbol
342
extern void coff_print_symbol
343
(bfd *, void * filep, asymbol *, bfd_print_symbol_type);
344
extern void coff_get_symbol_info
345
(bfd *, asymbol *, symbol_info *ret);
346
extern bfd_boolean _bfd_coff_is_local_label_name
347
(bfd *, const char *);
348
extern asymbol *coff_bfd_make_debug_symbol
349
(bfd *, void *, unsigned long);
350
extern bfd_boolean coff_find_nearest_line
351
(bfd *, asection *, asymbol **, bfd_vma, const char **,
352
const char **, unsigned int *);
353
extern bfd_boolean coff_find_nearest_line_discriminator
354
(bfd *, asection *, asymbol **, bfd_vma, const char **,
355
const char **, unsigned int *, unsigned int *);
356
struct dwarf_debug_section;
357
extern bfd_boolean coff_find_nearest_line_with_names
358
(bfd *, const struct dwarf_debug_section *, asection *, asymbol **,
359
bfd_vma, const char **, const char **, unsigned int *);
360
extern bfd_boolean coff_find_inliner_info
361
(bfd *, const char **, const char **, unsigned int *);
362
extern int coff_sizeof_headers
363
(bfd *, struct bfd_link_info *);
364
extern bfd_boolean bfd_coff_reloc16_relax_section
365
(bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
366
extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
367
(bfd *, struct bfd_link_info *, struct bfd_link_order *,
368
bfd_byte *, bfd_boolean, asymbol **);
369
extern bfd_vma bfd_coff_reloc16_get_value
370
(arelent *, struct bfd_link_info *, asection *);
371
extern void bfd_perform_slip
372
(bfd *, unsigned int, asection *, bfd_vma);
374
/* Functions and types in cofflink.c. */
376
#define STRING_SIZE_SIZE 4
378
/* We use a hash table to merge identical enum, struct, and union
379
definitions in the linker. */
381
/* Information we keep for a single element (an enum value, a
382
structure or union field) in the debug merge hash table. */
384
struct coff_debug_merge_element
387
struct coff_debug_merge_element *next;
395
/* Symbol index for complex type. */
399
/* A linked list of debug merge entries for a given name. */
401
struct coff_debug_merge_type
403
/* Next type with the same name. */
404
struct coff_debug_merge_type *next;
409
/* Symbol index where this type is defined. */
412
/* List of elements. */
413
struct coff_debug_merge_element *elements;
416
/* Information we store in the debug merge hash table. */
418
struct coff_debug_merge_hash_entry
420
struct bfd_hash_entry root;
422
/* A list of types with this name. */
423
struct coff_debug_merge_type *types;
426
/* The debug merge hash table. */
428
struct coff_debug_merge_hash_table
430
struct bfd_hash_table root;
433
/* Initialize a COFF debug merge hash table. */
435
#define coff_debug_merge_hash_table_init(table) \
436
(bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
437
sizeof (struct coff_debug_merge_hash_entry)))
439
/* Free a COFF debug merge hash table. */
441
#define coff_debug_merge_hash_table_free(table) \
442
(bfd_hash_table_free (&(table)->root))
444
/* Look up an entry in a COFF debug merge hash table. */
446
#define coff_debug_merge_hash_lookup(table, string, create, copy) \
447
((struct coff_debug_merge_hash_entry *) \
448
bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
450
/* Information we keep for each section in the output file when doing
451
a relocatable link. */
453
struct coff_link_section_info
455
/* The relocs to be output. */
456
struct internal_reloc *relocs;
457
/* For each reloc against a global symbol whose index was not known
458
when the reloc was handled, the global hash table entry. */
459
struct coff_link_hash_entry **rel_hashes;
462
/* Information that we pass around while doing the final link step. */
464
struct coff_final_link_info
466
/* General link information. */
467
struct bfd_link_info *info;
470
/* Used to indicate failure in traversal routine. */
472
/* If doing "task linking" set only during the time when we want the
473
global symbol writer to convert the storage class of defined global
474
symbols from global to static. */
475
bfd_boolean global_to_static;
476
/* Hash table for long symbol names. */
477
struct bfd_strtab_hash *strtab;
478
/* When doing a relocatable link, an array of information kept for
479
each output section, indexed by the target_index field. */
480
struct coff_link_section_info *section_info;
481
/* Symbol index of last C_FILE symbol (-1 if none). */
482
long last_file_index;
483
/* Contents of last C_FILE symbol. */
484
struct internal_syment last_file;
485
/* Symbol index of first aux entry of last .bf symbol with an empty
486
endndx field (-1 if none). */
488
/* Contents of last_bf_index aux entry. */
489
union internal_auxent last_bf;
490
/* Hash table used to merge debug information. */
491
struct coff_debug_merge_hash_table debug_merge;
492
/* Buffer large enough to hold swapped symbols of any input file. */
493
struct internal_syment *internal_syms;
494
/* Buffer large enough to hold sections of symbols of any input file. */
496
/* Buffer large enough to hold output indices of symbols of any
499
/* Buffer large enough to hold output symbols for any input file. */
501
/* Buffer large enough to hold external line numbers for any input
504
/* Buffer large enough to hold any input section. */
506
/* Buffer large enough to hold external relocs of any input section. */
507
bfd_byte *external_relocs;
508
/* Buffer large enough to hold swapped relocs of any input section. */
509
struct internal_reloc *internal_relocs;
512
/* Most COFF variants have no way to record the alignment of a
513
section. This struct is used to set a specific alignment based on
514
the name of the section. */
516
struct coff_section_alignment_entry
518
/* The section name. */
521
/* This is either (unsigned int) -1, indicating that the section
522
name must match exactly, or it is the number of letters which
523
must match at the start of the name. */
524
unsigned int comparison_length;
526
/* These macros may be used to fill in the first two fields in a
527
structure initialization. */
528
#define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
529
#define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
531
/* Only use this entry if the default section alignment for this
532
target is at least that much (as a power of two). If this field
533
is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
534
unsigned int default_alignment_min;
536
/* Only use this entry if the default section alignment for this
537
target is no greater than this (as a power of two). If this
538
field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
539
unsigned int default_alignment_max;
541
#define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
543
/* The desired alignment for this section (as a power of two). */
544
unsigned int alignment_power;
547
extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
548
(struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
549
extern bfd_boolean _bfd_coff_link_hash_table_init
550
(struct coff_link_hash_table *, bfd *,
551
struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
552
struct bfd_hash_table *,
555
extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
557
extern const char *_bfd_coff_internal_syment_name
558
(bfd *, const struct internal_syment *, char *);
559
extern bfd_boolean _bfd_coff_section_already_linked
560
(bfd *, asection *, struct bfd_link_info *);
561
extern bfd_boolean _bfd_coff_link_add_symbols
562
(bfd *, struct bfd_link_info *);
563
extern bfd_boolean _bfd_coff_final_link
564
(bfd *, struct bfd_link_info *);
565
extern struct internal_reloc *_bfd_coff_read_internal_relocs
566
(bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
567
struct internal_reloc *);
568
extern bfd_boolean _bfd_coff_generic_relocate_section
569
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
570
struct internal_reloc *, struct internal_syment *, asection **);
571
extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
572
(struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
573
extern bfd_boolean _bfd_coff_write_global_sym
574
(struct bfd_hash_entry *, void *);
575
extern bfd_boolean _bfd_coff_write_task_globals
576
(struct coff_link_hash_entry *, void *);
577
extern bfd_boolean _bfd_coff_link_input_bfd
578
(struct coff_final_link_info *, bfd *);
579
extern bfd_boolean _bfd_coff_reloc_link_order
580
(bfd *, struct coff_final_link_info *, asection *,
581
struct bfd_link_order *);
584
#define coff_get_section_contents_in_window \
585
_bfd_generic_get_section_contents_in_window
587
/* Functions in xcofflink.c. */
589
extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
591
extern long _bfd_xcoff_canonicalize_dynamic_symtab
593
extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
595
extern long _bfd_xcoff_canonicalize_dynamic_reloc
596
(bfd *, arelent **, asymbol **);
597
extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
599
extern void _bfd_xcoff_bfd_link_hash_table_free
600
(struct bfd_link_hash_table *);
601
extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
602
(bfd *, struct bfd_link_info *);
603
extern bfd_boolean _bfd_xcoff_bfd_final_link
604
(bfd *, struct bfd_link_info *);
605
extern bfd_boolean _bfd_xcoff_define_common_symbol
606
(bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
607
extern bfd_boolean _bfd_ppc_xcoff_relocate_section
608
(bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
609
struct internal_reloc *, struct internal_syment *, asection **);
611
/* Functions in coff-ppc.c. FIXME: These are called by pe.em in the
612
linker, and so should start with bfd and be declared in bfd.h. */
614
extern bfd_boolean ppc_allocate_toc_section
615
(struct bfd_link_info *);
616
extern bfd_boolean ppc_process_before_allocation
617
(bfd *, struct bfd_link_info *);