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_strings_len(bfd) (coff_data (bfd)->strings_len)
39 #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings)
40 #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes)
41 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
42 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
44 /* `Tdata' information kept for COFF files. */
46 typedef struct coff_tdata
48 struct coff_symbol_struct
*symbols
; /* Symtab for input bfd. */
49 unsigned int *conversion_table
;
53 struct coff_ptr_struct
*raw_syments
;
54 unsigned long raw_syment_count
;
56 /* These are only valid once writing has begun. */
57 unsigned long int relocbase
;
59 /* These members communicate important constants about the symbol table
60 to GDB's symbol-reading code. These `constants' unfortunately vary
61 from coff implementation to implementation... */
62 unsigned local_n_btmask
;
63 unsigned local_n_btshft
;
64 unsigned local_n_tmask
;
65 unsigned local_n_tshift
;
66 unsigned local_symesz
;
67 unsigned local_auxesz
;
68 unsigned local_linesz
;
70 /* The unswapped external symbols. May be NULL. Read by
71 _bfd_coff_get_external_symbols. */
73 /* If this is TRUE, the external_syms may not be freed. */
74 bfd_boolean keep_syms
;
76 /* The string table. May be NULL. Read by
77 _bfd_coff_read_string_table. */
79 /* The length of the strings table. For error checking. */
80 bfd_size_type strings_len
;
81 /* If this is TRUE, the strings may not be freed. */
82 bfd_boolean keep_strings
;
83 /* If this is TRUE, the strings have been written out already. */
84 bfd_boolean strings_written
;
86 /* Is this a PE format coff file? */
88 /* Used by the COFF backend linker. */
89 struct coff_link_hash_entry
**sym_hashes
;
91 /* Used by the pe linker for PowerPC. */
92 int *local_toc_sym_map
;
94 struct bfd_link_info
*link_info
;
96 /* Used by coff_find_nearest_line. */
99 /* A place to stash dwarf2 info for this bfd. */
100 void * dwarf2_find_line_info
;
102 /* The timestamp from the COFF file header. */
105 /* Copy of some of the f_flags bits in the COFF filehdr structure,
109 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data
110 is kept in internal_filehdr.go32stub beforehand. */
114 /* Tdata for pe image files. */
115 typedef struct pe_tdata
118 struct internal_extra_pe_aouthdr pe_opthdr
;
120 int has_reloc_section
;
121 int dont_strip_reloc
;
122 bfd_boolean insert_timestamp
;
123 bfd_boolean (*in_reloc_p
) (bfd
*, reloc_howto_type
*);
129 bfd_boolean (*after_write_object_contents
) (bfd
*);
135 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data)
137 /* Tdata for XCOFF files. */
141 /* Basic COFF information. */
144 /* TRUE if this is an XCOFF64 file. */
147 /* TRUE if a large a.out header should be generated. */
148 bfd_boolean full_aouthdr
;
153 /* Index of section holding TOC. */
156 /* Index of section holding entry point. */
159 /* .text alignment from optional header. */
160 int text_align_power
;
162 /* .data alignment from optional header. */
163 int data_align_power
;
165 /* modtype from optional header. */
168 /* cputype from optional header. */
171 /* maxdata from optional header. */
174 /* maxstack from optional header. */
177 /* Used by the XCOFF backend linker. */
180 unsigned int *lineno_counts
;
181 unsigned int import_file_id
;
184 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
186 /* We take the address of the first element of an asymbol to ensure that the
187 macro is only ever applied to an asymbol. */
188 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
190 /* The used_by_bfd field of a section may be set to a pointer to this
193 struct coff_section_tdata
195 /* The relocs, swapped into COFF internal form. This may be NULL. */
196 struct internal_reloc
*relocs
;
197 /* If this is TRUE, the relocs entry may not be freed. */
198 bfd_boolean keep_relocs
;
199 /* The section contents. This may be NULL. */
201 /* If this is TRUE, the contents entry may not be freed. */
202 bfd_boolean keep_contents
;
203 /* Information cached by coff_find_nearest_line. */
206 const char *function
;
207 /* Optional information about a COMDAT entry; NULL if not COMDAT. */
208 struct coff_comdat_info
*comdat
;
210 /* A pointer used for .stab linking optimizations. */
212 /* Available for individual backends. */
216 /* An accessor macro for the coff_section_tdata structure. */
217 #define coff_section_data(abfd, sec) \
218 ((struct coff_section_tdata *) (sec)->used_by_bfd)
220 /* Tdata for sections in XCOFF files. This is used by the linker. */
222 struct xcoff_section_tdata
224 /* Used for XCOFF csects created by the linker; points to the real
225 XCOFF section which contains this csect. */
227 /* The lineno_count field for the enclosing section, because we are
228 going to clobber it there. */
229 unsigned int lineno_count
;
230 /* The first and last symbol indices for symbols used by this csect. */
231 unsigned long first_symndx
;
232 unsigned long last_symndx
;
235 /* An accessor macro the xcoff_section_tdata structure. */
236 #define xcoff_section_data(abfd, sec) \
237 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
239 /* Tdata for sections in PE files. */
241 struct pei_section_tdata
243 /* The virtual size of the section. */
244 bfd_size_type virt_size
;
245 /* The PE section flags. */
249 /* An accessor macro for the pei_section_tdata structure. */
250 #define pei_section_data(abfd, sec) \
251 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
253 /* COFF linker hash table entries. */
255 struct coff_link_hash_entry
257 struct bfd_link_hash_entry root
;
259 /* Symbol index in output file. Set to -1 initially. Set to -2 if
260 there is a reloc against this symbol. */
267 unsigned char symbol_class
;
269 /* Number of auxiliary entries. */
272 /* BFD to take auxiliary entries from. */
275 /* Pointer to array of auxiliary entries, if any. */
276 union internal_auxent
*aux
;
278 /* Flag word; legal values follow. */
279 unsigned short coff_link_hash_flags
;
280 /* Symbol is a PE section symbol. */
281 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
284 /* COFF linker hash table. */
286 struct coff_link_hash_table
288 struct bfd_link_hash_table root
;
289 /* A pointer to information used to link stabs in sections. */
290 struct stab_info stab_info
;
293 /* Look up an entry in a COFF linker hash table. */
295 #define coff_link_hash_lookup(table, string, create, copy, follow) \
296 ((struct coff_link_hash_entry *) \
297 bfd_link_hash_lookup (&(table)->root, (string), (create), \
300 /* Traverse a COFF linker hash table. */
302 #define coff_link_hash_traverse(table, func, info) \
303 (bfd_link_hash_traverse \
305 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
308 /* Get the COFF linker hash table from a link_info structure. */
310 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
312 /* Functions in coffgen.c. */
313 extern const bfd_target
*coff_object_p
315 extern struct bfd_section
*coff_section_from_bfd_index
317 extern long coff_get_symtab_upper_bound
319 extern long coff_canonicalize_symtab
321 extern int coff_count_linenumbers
323 extern struct coff_symbol_struct
*coff_symbol_from
325 extern bfd_boolean coff_renumber_symbols
327 extern void coff_mangle_symbols
329 extern bfd_boolean coff_write_symbols
331 extern bfd_boolean coff_write_alien_symbol
332 (bfd
*, asymbol
*, struct internal_syment
*, bfd_vma
*,
333 bfd_size_type
*, asection
**, bfd_size_type
*);
334 extern bfd_boolean coff_write_linenumbers
336 extern alent
*coff_get_lineno
338 extern asymbol
*coff_section_symbol
340 extern bfd_boolean _bfd_coff_get_external_symbols
342 extern const char *_bfd_coff_read_string_table
344 extern bfd_boolean _bfd_coff_free_symbols
346 extern struct coff_ptr_struct
*coff_get_normalized_symtab
348 extern long coff_get_reloc_upper_bound
350 extern asymbol
*coff_make_empty_symbol
352 extern void coff_print_symbol
353 (bfd
*, void * filep
, asymbol
*, bfd_print_symbol_type
);
354 extern void coff_get_symbol_info
355 (bfd
*, asymbol
*, symbol_info
*ret
);
356 extern bfd_boolean _bfd_coff_is_local_label_name
357 (bfd
*, const char *);
358 extern asymbol
*coff_bfd_make_debug_symbol
359 (bfd
*, void *, unsigned long);
360 extern bfd_boolean coff_find_nearest_line
361 (bfd
*, asymbol
**, asection
*, bfd_vma
,
362 const char **, const char **, unsigned int *, unsigned int *);
363 #define coff_find_line _bfd_nosymbols_find_line
364 struct dwarf_debug_section
;
365 extern bfd_boolean coff_find_nearest_line_with_names
366 (bfd
*, asymbol
**, asection
*, bfd_vma
, const char **, const char **,
367 unsigned int *, const struct dwarf_debug_section
*);
368 extern bfd_boolean coff_find_inliner_info
369 (bfd
*, const char **, const char **, unsigned int *);
370 extern int coff_sizeof_headers
371 (bfd
*, struct bfd_link_info
*);
372 extern bfd_boolean bfd_coff_reloc16_relax_section
373 (bfd
*, asection
*, struct bfd_link_info
*, bfd_boolean
*);
374 extern bfd_byte
*bfd_coff_reloc16_get_relocated_section_contents
375 (bfd
*, struct bfd_link_info
*, struct bfd_link_order
*,
376 bfd_byte
*, bfd_boolean
, asymbol
**);
377 extern bfd_vma bfd_coff_reloc16_get_value
378 (arelent
*, struct bfd_link_info
*, asection
*);
379 extern void bfd_perform_slip
380 (bfd
*, unsigned int, asection
*, bfd_vma
);
382 /* Functions and types in cofflink.c. */
384 #define STRING_SIZE_SIZE 4
386 /* We use a hash table to merge identical enum, struct, and union
387 definitions in the linker. */
389 /* Information we keep for a single element (an enum value, a
390 structure or union field) in the debug merge hash table. */
392 struct coff_debug_merge_element
395 struct coff_debug_merge_element
*next
;
403 /* Symbol index for complex type. */
407 /* A linked list of debug merge entries for a given name. */
409 struct coff_debug_merge_type
411 /* Next type with the same name. */
412 struct coff_debug_merge_type
*next
;
417 /* Symbol index where this type is defined. */
420 /* List of elements. */
421 struct coff_debug_merge_element
*elements
;
424 /* Information we store in the debug merge hash table. */
426 struct coff_debug_merge_hash_entry
428 struct bfd_hash_entry root
;
430 /* A list of types with this name. */
431 struct coff_debug_merge_type
*types
;
434 /* The debug merge hash table. */
436 struct coff_debug_merge_hash_table
438 struct bfd_hash_table root
;
441 /* Initialize a COFF debug merge hash table. */
443 #define coff_debug_merge_hash_table_init(table) \
444 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
445 sizeof (struct coff_debug_merge_hash_entry)))
447 /* Free a COFF debug merge hash table. */
449 #define coff_debug_merge_hash_table_free(table) \
450 (bfd_hash_table_free (&(table)->root))
452 /* Look up an entry in a COFF debug merge hash table. */
454 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
455 ((struct coff_debug_merge_hash_entry *) \
456 bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
458 /* Information we keep for each section in the output file when doing
459 a relocatable link. */
461 struct coff_link_section_info
463 /* The relocs to be output. */
464 struct internal_reloc
*relocs
;
465 /* For each reloc against a global symbol whose index was not known
466 when the reloc was handled, the global hash table entry. */
467 struct coff_link_hash_entry
**rel_hashes
;
470 /* Information that we pass around while doing the final link step. */
472 struct coff_final_link_info
474 /* General link information. */
475 struct bfd_link_info
*info
;
478 /* Used to indicate failure in traversal routine. */
480 /* If doing "task linking" set only during the time when we want the
481 global symbol writer to convert the storage class of defined global
482 symbols from global to static. */
483 bfd_boolean global_to_static
;
484 /* Hash table for long symbol names. */
485 struct bfd_strtab_hash
*strtab
;
486 /* When doing a relocatable link, an array of information kept for
487 each output section, indexed by the target_index field. */
488 struct coff_link_section_info
*section_info
;
489 /* Symbol index of last C_FILE symbol (-1 if none). */
490 long last_file_index
;
491 /* Contents of last C_FILE symbol. */
492 struct internal_syment last_file
;
493 /* Symbol index of first aux entry of last .bf symbol with an empty
494 endndx field (-1 if none). */
496 /* Contents of last_bf_index aux entry. */
497 union internal_auxent last_bf
;
498 /* Hash table used to merge debug information. */
499 struct coff_debug_merge_hash_table debug_merge
;
500 /* Buffer large enough to hold swapped symbols of any input file. */
501 struct internal_syment
*internal_syms
;
502 /* Buffer large enough to hold sections of symbols of any input file. */
504 /* Buffer large enough to hold output indices of symbols of any
507 /* Buffer large enough to hold output symbols for any input file. */
509 /* Buffer large enough to hold external line numbers for any input
512 /* Buffer large enough to hold any input section. */
514 /* Buffer large enough to hold external relocs of any input section. */
515 bfd_byte
*external_relocs
;
516 /* Buffer large enough to hold swapped relocs of any input section. */
517 struct internal_reloc
*internal_relocs
;
520 /* Most COFF variants have no way to record the alignment of a
521 section. This struct is used to set a specific alignment based on
522 the name of the section. */
524 struct coff_section_alignment_entry
526 /* The section name. */
529 /* This is either (unsigned int) -1, indicating that the section
530 name must match exactly, or it is the number of letters which
531 must match at the start of the name. */
532 unsigned int comparison_length
;
534 /* These macros may be used to fill in the first two fields in a
535 structure initialization. */
536 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
537 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
539 /* Only use this entry if the default section alignment for this
540 target is at least that much (as a power of two). If this field
541 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
542 unsigned int default_alignment_min
;
544 /* Only use this entry if the default section alignment for this
545 target is no greater than this (as a power of two). If this
546 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
547 unsigned int default_alignment_max
;
549 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
551 /* The desired alignment for this section (as a power of two). */
552 unsigned int alignment_power
;
555 extern struct bfd_hash_entry
*_bfd_coff_link_hash_newfunc
556 (struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *);
557 extern bfd_boolean _bfd_coff_link_hash_table_init
558 (struct coff_link_hash_table
*, bfd
*,
559 struct bfd_hash_entry
*(*) (struct bfd_hash_entry
*,
560 struct bfd_hash_table
*,
563 extern struct bfd_link_hash_table
*_bfd_coff_link_hash_table_create
565 extern const char *_bfd_coff_internal_syment_name
566 (bfd
*, const struct internal_syment
*, char *);
567 extern bfd_boolean _bfd_coff_section_already_linked
568 (bfd
*, asection
*, struct bfd_link_info
*);
569 extern bfd_boolean _bfd_coff_link_add_symbols
570 (bfd
*, struct bfd_link_info
*);
571 extern bfd_boolean _bfd_coff_final_link
572 (bfd
*, struct bfd_link_info
*);
573 extern struct internal_reloc
*_bfd_coff_read_internal_relocs
574 (bfd
*, asection
*, bfd_boolean
, bfd_byte
*, bfd_boolean
,
575 struct internal_reloc
*);
576 extern bfd_boolean _bfd_coff_generic_relocate_section
577 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
578 struct internal_reloc
*, struct internal_syment
*, asection
**);
579 extern struct bfd_hash_entry
*_bfd_coff_debug_merge_hash_newfunc
580 (struct bfd_hash_entry
*, struct bfd_hash_table
*, const char *);
581 extern bfd_boolean _bfd_coff_write_global_sym
582 (struct bfd_hash_entry
*, void *);
583 extern bfd_boolean _bfd_coff_write_task_globals
584 (struct coff_link_hash_entry
*, void *);
585 extern bfd_boolean _bfd_coff_link_input_bfd
586 (struct coff_final_link_info
*, bfd
*);
587 extern bfd_boolean _bfd_coff_reloc_link_order
588 (bfd
*, struct coff_final_link_info
*, asection
*,
589 struct bfd_link_order
*);
592 #define coff_get_section_contents_in_window \
593 _bfd_generic_get_section_contents_in_window
595 /* Functions in xcofflink.c. */
597 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
599 extern long _bfd_xcoff_canonicalize_dynamic_symtab
601 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
603 extern long _bfd_xcoff_canonicalize_dynamic_reloc
604 (bfd
*, arelent
**, asymbol
**);
605 extern struct bfd_link_hash_table
*_bfd_xcoff_bfd_link_hash_table_create
607 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
608 (bfd
*, struct bfd_link_info
*);
609 extern bfd_boolean _bfd_xcoff_bfd_final_link
610 (bfd
*, struct bfd_link_info
*);
611 extern bfd_boolean _bfd_xcoff_define_common_symbol
612 (bfd
*, struct bfd_link_info
*, struct bfd_link_hash_entry
*);
613 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
614 (bfd
*, struct bfd_link_info
*, bfd
*, asection
*, bfd_byte
*,
615 struct internal_reloc
*, struct internal_syment
*, asection
**);
617 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the
618 linker, and so should start with bfd and be declared in bfd.h. */
620 extern bfd_boolean ppc_allocate_toc_section
621 (struct bfd_link_info
*);
622 extern bfd_boolean ppc_process_before_allocation
623 (bfd
*, struct bfd_link_info
*);