1 /* BFD COFF object file private structure.
2 Copyright (C) 1990-2014 Free Software Foundation, Inc.
3 Written by Cygnus Support.
5 This file is part of BFD, the Binary File Descriptor library.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
20 MA 02110-1301, USA. */
24 /* Object file tdata; access macros. */
26 #define coff_data(bfd) ((bfd)->tdata.coff_obj_data)
27 #define obj_pe(bfd) (coff_data (bfd)->pe)
28 #define obj_symbols(bfd) (coff_data (bfd)->symbols)
29 #define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos)
30 #define obj_relocbase(bfd) (coff_data (bfd)->relocbase)
31 #define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments)
32 #define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count)
33 #define obj_convert(bfd) (coff_data (bfd)->conversion_table)
34 #define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size)
35 #define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms)
36 #define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms)
37 #define obj_coff_strings(bfd) (coff_data (bfd)->strings)
38 #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings)
39 #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes)
40 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
41 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
43 /* `Tdata' information kept for COFF files. */
45 typedef struct coff_tdata
47 struct coff_symbol_struct
*symbols
; /* Symtab for input bfd. */
48 unsigned int *conversion_table
;
52 struct coff_ptr_struct
*raw_syments
;
53 unsigned long raw_syment_count
;
55 /* These are only valid once writing has begun. */
56 unsigned long int relocbase
;
58 /* These members communicate important constants about the symbol table
59 to GDB's symbol-reading code. These `constants' unfortunately vary
60 from coff implementation to implementation... */
61 unsigned local_n_btmask
;
62 unsigned local_n_btshft
;
63 unsigned local_n_tmask
;
64 unsigned local_n_tshift
;
65 unsigned local_symesz
;
66 unsigned local_auxesz
;
67 unsigned local_linesz
;
69 /* The unswapped external symbols. May be NULL. Read by
70 _bfd_coff_get_external_symbols. */
72 /* If this is TRUE, the external_syms may not be freed. */
73 bfd_boolean keep_syms
;
75 /* The string table. May be NULL. Read by
76 _bfd_coff_read_string_table. */
78 /* If this is TRUE, the strings may not be freed. */
79 bfd_boolean keep_strings
;
80 /* If this is TRUE, the strings have been written out already. */
81 bfd_boolean strings_written
;
83 /* Is this a PE format coff file? */
85 /* Used by the COFF backend linker. */
86 struct coff_link_hash_entry
**sym_hashes
;
88 /* Used by the pe linker for PowerPC. */
89 int *local_toc_sym_map
;
91 struct bfd_link_info
*link_info
;
93 /* Used by coff_find_nearest_line. */
96 /* A place to stash dwarf2 info for this bfd. */
97 void * dwarf2_find_line_info
;
99 /* The timestamp from the COFF file header. */
102 /* Copy of some of the f_flags bits in the COFF filehdr structure,
106 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data
107 is kept in internal_filehdr.go32stub beforehand. */
111 /* Tdata for pe image files. */
112 typedef struct pe_tdata
115 struct internal_extra_pe_aouthdr pe_opthdr
;
117 int has_reloc_section
;
118 int dont_strip_reloc
;
119 bfd_boolean insert_timestamp
;
120 bfd_boolean (*in_reloc_p
) (bfd
*, reloc_howto_type
*);
126 bfd_boolean (*after_write_object_contents
) (bfd
*);
132 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data)
134 /* Tdata for XCOFF files. */
138 /* Basic COFF information. */
141 /* TRUE if this is an XCOFF64 file. */
144 /* TRUE if a large a.out header should be generated. */
145 bfd_boolean full_aouthdr
;
150 /* Index of section holding TOC. */
153 /* Index of section holding entry point. */
156 /* .text alignment from optional header. */
157 int text_align_power
;
159 /* .data alignment from optional header. */
160 int data_align_power
;
162 /* modtype from optional header. */
165 /* cputype from optional header. */
168 /* maxdata from optional header. */
171 /* maxstack from optional header. */
174 /* Used by the XCOFF backend linker. */
177 unsigned int *lineno_counts
;
178 unsigned int import_file_id
;
181 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
183 /* We take the address of the first element of an asymbol to ensure that the
184 macro is only ever applied to an asymbol. */
185 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
187 /* The used_by_bfd field of a section may be set to a pointer to this
190 struct coff_section_tdata
192 /* The relocs, swapped into COFF internal form. This may be NULL. */
193 struct internal_reloc
*relocs
;
194 /* If this is TRUE, the relocs entry may not be freed. */
195 bfd_boolean keep_relocs
;
196 /* The section contents. This may be NULL. */
198 /* If this is TRUE, the contents entry may not be freed. */
199 bfd_boolean keep_contents
;
200 /* Information cached by coff_find_nearest_line. */
203 const char *function
;
204 /* Optional information about a COMDAT entry; NULL if not COMDAT. */
205 struct coff_comdat_info
*comdat
;
207 /* A pointer used for .stab linking optimizations. */
209 /* Available for individual backends. */
213 /* An accessor macro for the coff_section_tdata structure. */
214 #define coff_section_data(abfd, sec) \
215 ((struct coff_section_tdata *) (sec)->used_by_bfd)
217 /* Tdata for sections in XCOFF files. This is used by the linker. */
219 struct xcoff_section_tdata
221 /* Used for XCOFF csects created by the linker; points to the real
222 XCOFF section which contains this csect. */
224 /* The lineno_count field for the enclosing section, because we are
225 going to clobber it there. */
226 unsigned int lineno_count
;
227 /* The first and last symbol indices for symbols used by this csect. */
228 unsigned long first_symndx
;
229 unsigned long last_symndx
;
232 /* An accessor macro the xcoff_section_tdata structure. */
233 #define xcoff_section_data(abfd, sec) \
234 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
236 /* Tdata for sections in PE files. */
238 struct pei_section_tdata
240 /* The virtual size of the section. */
241 bfd_size_type virt_size
;
242 /* The PE section flags. */
246 /* An accessor macro for the pei_section_tdata structure. */
247 #define pei_section_data(abfd, sec) \
248 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
250 /* COFF linker hash table entries. */
252 struct coff_link_hash_entry
254 struct bfd_link_hash_entry root
;
256 /* Symbol index in output file. Set to -1 initially. Set to -2 if
257 there is a reloc against this symbol. */
264 unsigned char symbol_class
;
266 /* Number of auxiliary entries. */
269 /* BFD to take auxiliary entries from. */
272 /* Pointer to array of auxiliary entries, if any. */
273 union internal_auxent
*aux
;
275 /* Flag word; legal values follow. */
276 unsigned short coff_link_hash_flags
;
277 /* Symbol is a PE section symbol. */
278 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
281 /* COFF linker hash table. */
283 struct coff_link_hash_table
285 struct bfd_link_hash_table root
;
286 /* A pointer to information used to link stabs in sections. */
287 struct stab_info stab_info
;
290 /* Look up an entry in a COFF linker hash table. */
292 #define coff_link_hash_lookup(table, string, create, copy, follow) \
293 ((struct coff_link_hash_entry *) \
294 bfd_link_hash_lookup (&(table)->root, (string), (create), \
297 /* Traverse a COFF linker hash table. */
299 #define coff_link_hash_traverse(table, func, info) \
300 (bfd_link_hash_traverse \
302 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
305 /* Get the COFF linker hash table from a link_info structure. */
307 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
309 /* Functions in coffgen.c. */
310 extern const bfd_target
*coff_object_p
312 extern struct bfd_section
*coff_section_from_bfd_index
314 extern long coff_get_symtab_upper_bound
316 extern long coff_canonicalize_symtab
318 extern int coff_count_linenumbers
320 extern struct coff_symbol_struct
*coff_symbol_from
322 extern bfd_boolean coff_renumber_symbols
324 extern void coff_mangle_symbols
326 extern bfd_boolean coff_write_symbols
328 extern bfd_boolean coff_write_alien_symbol
329 (bfd
*, asymbol
*, struct internal_syment
*, bfd_vma
*,
330 bfd_size_type
*, asection
**, bfd_size_type
*);
331 extern bfd_boolean coff_write_linenumbers
333 extern alent
*coff_get_lineno
335 extern asymbol
*coff_section_symbol
337 extern bfd_boolean _bfd_coff_get_external_symbols
339 extern const char *_bfd_coff_read_string_table
341 extern bfd_boolean _bfd_coff_free_symbols
343 extern struct coff_ptr_struct
*coff_get_normalized_symtab
345 extern long coff_get_reloc_upper_bound
347 extern asymbol
*coff_make_empty_symbol
349 extern void coff_print_symbol
350 (bfd
*, void * filep
, asymbol
*, bfd_print_symbol_type
);
351 extern void coff_get_symbol_info
352 (bfd
*, asymbol
*, symbol_info
*ret
);
353 extern bfd_boolean _bfd_coff_is_local_label_name
354 (bfd
*, const char *);
355 extern asymbol
*coff_bfd_make_debug_symbol
356 (bfd
*, void *, unsigned long);
357 extern bfd_boolean coff_find_nearest_line
358 (bfd
*, asymbol
**, asection
*, bfd_vma
,
359 const char **, const char **, unsigned int *, unsigned int *);
360 #define coff_find_line _bfd_nosymbols_find_line
361 struct dwarf_debug_section
;
362 extern bfd_boolean coff_find_nearest_line_with_names
363 (bfd
*, asymbol
**, asection
*, bfd_vma
, const char **, const char **,
364 unsigned int *, const struct dwarf_debug_section
*);
365 extern bfd_boolean coff_find_inliner_info
366 (bfd
*, const char **, const char **, unsigned int *);
367 extern int coff_sizeof_headers
368 (bfd
*, struct bfd_link_info
*);
369 extern bfd_boolean bfd_coff_reloc16_relax_section
370 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
371 extern bfd_byte
*bfd_coff_reloc16_get_relocated_section_contents
372 (bfd
*, struct bfd_link_info
*, struct bfd_link_order
*,
373 bfd_byte
*, bfd_boolean
, asymbol
**);
374 extern bfd_vma bfd_coff_reloc16_get_value
375 (arelent
*, struct bfd_link_info
*, asection
*);
376 extern void bfd_perform_slip
377 (bfd
*, unsigned int, asection
*, bfd_vma
);
379 /* Functions and types in cofflink.c. */
381 #define STRING_SIZE_SIZE 4
383 /* We use a hash table to merge identical enum, struct, and union
384 definitions in the linker. */
386 /* Information we keep for a single element (an enum value, a
387 structure or union field) in the debug merge hash table. */
389 struct coff_debug_merge_element
392 struct coff_debug_merge_element
*next
;
400 /* Symbol index for complex type. */
404 /* A linked list of debug merge entries for a given name. */
406 struct coff_debug_merge_type
408 /* Next type with the same name. */
409 struct coff_debug_merge_type
*next
;
414 /* Symbol index where this type is defined. */
417 /* List of elements. */
418 struct coff_debug_merge_element
*elements
;
421 /* Information we store in the debug merge hash table. */
423 struct coff_debug_merge_hash_entry
425 struct bfd_hash_entry root
;
427 /* A list of types with this name. */
428 struct coff_debug_merge_type
*types
;
431 /* The debug merge hash table. */
433 struct coff_debug_merge_hash_table
435 struct bfd_hash_table root
;
438 /* Initialize a COFF debug merge hash table. */
440 #define coff_debug_merge_hash_table_init(table) \
441 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
442 sizeof (struct coff_debug_merge_hash_entry)))
444 /* Free a COFF debug merge hash table. */
446 #define coff_debug_merge_hash_table_free(table) \
447 (bfd_hash_table_free (&(table)->root))
449 /* Look up an entry in a COFF debug merge hash table. */
451 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
452 ((struct coff_debug_merge_hash_entry *) \
453 bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
455 /* Information we keep for each section in the output file when doing
456 a relocatable link. */
458 struct coff_link_section_info
460 /* The relocs to be output. */
461 struct internal_reloc
*relocs
;
462 /* For each reloc against a global symbol whose index was not known
463 when the reloc was handled, the global hash table entry. */
464 struct coff_link_hash_entry
**rel_hashes
;
467 /* Information that we pass around while doing the final link step. */
469 struct coff_final_link_info
471 /* General link information. */
472 struct bfd_link_info
*info
;
475 /* Used to indicate failure in traversal routine. */
477 /* If doing "task linking" set only during the time when we want the
478 global symbol writer to convert the storage class of defined global
479 symbols from global to static. */
480 bfd_boolean global_to_static
;
481 /* Hash table for long symbol names. */
482 struct bfd_strtab_hash
*strtab
;
483 /* When doing a relocatable link, an array of information kept for
484 each output section, indexed by the target_index field. */
485 struct coff_link_section_info
*section_info
;
486 /* Symbol index of last C_FILE symbol (-1 if none). */
487 long last_file_index
;
488 /* Contents of last C_FILE symbol. */
489 struct internal_syment last_file
;
490 /* Symbol index of first aux entry of last .bf symbol with an empty
491 endndx field (-1 if none). */
493 /* Contents of last_bf_index aux entry. */
494 union internal_auxent last_bf
;
495 /* Hash table used to merge debug information. */
496 struct coff_debug_merge_hash_table debug_merge
;
497 /* Buffer large enough to hold swapped symbols of any input file. */
498 struct internal_syment
*internal_syms
;
499 /* Buffer large enough to hold sections of symbols of any input file. */
501 /* Buffer large enough to hold output indices of symbols of any
504 /* Buffer large enough to hold output symbols for any input file. */
506 /* Buffer large enough to hold external line numbers for any input
509 /* Buffer large enough to hold any input section. */
511 /* Buffer large enough to hold external relocs of any input section. */
512 bfd_byte
*external_relocs
;
513 /* Buffer large enough to hold swapped relocs of any input section. */
514 struct internal_reloc
*internal_relocs
;
517 /* Most COFF variants have no way to record the alignment of a
518 section. This struct is used to set a specific alignment based on
519 the name of the section. */
521 struct coff_section_alignment_entry
523 /* The section name. */
526 /* This is either (unsigned int) -1, indicating that the section
527 name must match exactly, or it is the number of letters which
528 must match at the start of the name. */
529 unsigned int comparison_length
;
531 /* These macros may be used to fill in the first two fields in a
532 structure initialization. */
533 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
534 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
536 /* Only use this entry if the default section alignment for this
537 target is at least that much (as a power of two). If this field
538 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
539 unsigned int default_alignment_min
;
541 /* Only use this entry if the default section alignment for this
542 target is no greater than this (as a power of two). If this
543 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
544 unsigned int default_alignment_max
;
546 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
548 /* The desired alignment for this section (as a power of two). */
549 unsigned int alignment_power
;
552 extern struct bfd_hash_entry
*_bfd_coff_link_hash_newfunc
553 (struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *);
554 extern bfd_boolean _bfd_coff_link_hash_table_init
555 (struct coff_link_hash_table
*, bfd
*,
556 struct bfd_hash_entry
*(*) (struct bfd_hash_entry
*,
557 struct bfd_hash_table
*,
560 extern struct bfd_link_hash_table
*_bfd_coff_link_hash_table_create
562 extern const char *_bfd_coff_internal_syment_name
563 (bfd
*, const struct internal_syment
*, char *);
564 extern bfd_boolean _bfd_coff_section_already_linked
565 (bfd
*, asection
*, struct bfd_link_info
*);
566 extern bfd_boolean _bfd_coff_link_add_symbols
567 (bfd
*, struct bfd_link_info
*);
568 extern bfd_boolean _bfd_coff_final_link
569 (bfd
*, struct bfd_link_info
*);
570 extern struct internal_reloc
*_bfd_coff_read_internal_relocs
571 (bfd
*, asection
*, bfd_boolean
, bfd_byte
*, bfd_boolean
,
572 struct internal_reloc
*);
573 extern bfd_boolean _bfd_coff_generic_relocate_section
574 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
575 struct internal_reloc
*, struct internal_syment
*, asection
**);
576 extern struct bfd_hash_entry
*_bfd_coff_debug_merge_hash_newfunc
577 (struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *);
578 extern bfd_boolean _bfd_coff_write_global_sym
579 (struct bfd_hash_entry
*, void *);
580 extern bfd_boolean _bfd_coff_write_task_globals
581 (struct coff_link_hash_entry
*, void *);
582 extern bfd_boolean _bfd_coff_link_input_bfd
583 (struct coff_final_link_info
*, bfd
*);
584 extern bfd_boolean _bfd_coff_reloc_link_order
585 (bfd
*, struct coff_final_link_info
*, asection
*,
586 struct bfd_link_order
*);
589 #define coff_get_section_contents_in_window \
590 _bfd_generic_get_section_contents_in_window
592 /* Functions in xcofflink.c. */
594 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
596 extern long _bfd_xcoff_canonicalize_dynamic_symtab
598 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
600 extern long _bfd_xcoff_canonicalize_dynamic_reloc
601 (bfd
*, arelent
**, asymbol
**);
602 extern struct bfd_link_hash_table
*_bfd_xcoff_bfd_link_hash_table_create
604 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
605 (bfd
*, struct bfd_link_info
*);
606 extern bfd_boolean _bfd_xcoff_bfd_final_link
607 (bfd
*, struct bfd_link_info
*);
608 extern bfd_boolean _bfd_xcoff_define_common_symbol
609 (bfd
*, struct bfd_link_info
*, struct bfd_link_hash_entry
*);
610 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
611 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
612 struct internal_reloc
*, struct internal_syment
*, asection
**);
614 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the
615 linker, and so should start with bfd and be declared in bfd.h. */
617 extern bfd_boolean ppc_allocate_toc_section
618 (struct bfd_link_info
*);
619 extern bfd_boolean ppc_process_before_allocation
620 (bfd
*, struct bfd_link_info
*);