1 /* BFD COFF object file private structure.
2 Copyright 1990-2013 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. */
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 *);
124 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data)
126 /* Tdata for XCOFF files. */
130 /* Basic COFF information. */
133 /* TRUE if this is an XCOFF64 file. */
136 /* TRUE if a large a.out header should be generated. */
137 bfd_boolean full_aouthdr;
142 /* Index of section holding TOC. */
145 /* Index of section holding entry point. */
148 /* .text alignment from optional header. */
149 int text_align_power;
151 /* .data alignment from optional header. */
152 int data_align_power;
154 /* modtype from optional header. */
157 /* cputype from optional header. */
160 /* maxdata from optional header. */
163 /* maxstack from optional header. */
166 /* Used by the XCOFF backend linker. */
169 unsigned int *lineno_counts;
170 unsigned int import_file_id;
173 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
175 /* We take the address of the first element of an asymbol to ensure that the
176 macro is only ever applied to an asymbol. */
177 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
179 /* The used_by_bfd field of a section may be set to a pointer to this
182 struct coff_section_tdata
184 /* The relocs, swapped into COFF internal form. This may be NULL. */
185 struct internal_reloc *relocs;
186 /* If this is TRUE, the relocs entry may not be freed. */
187 bfd_boolean keep_relocs;
188 /* The section contents. This may be NULL. */
190 /* If this is TRUE, the contents entry may not be freed. */
191 bfd_boolean keep_contents;
192 /* Information cached by coff_find_nearest_line. */
195 const char *function;
196 /* Optional information about a COMDAT entry; NULL if not COMDAT. */
197 struct coff_comdat_info *comdat;
199 /* A pointer used for .stab linking optimizations. */
201 /* Available for individual backends. */
205 /* An accessor macro for the coff_section_tdata structure. */
206 #define coff_section_data(abfd, sec) \
207 ((struct coff_section_tdata *) (sec)->used_by_bfd)
209 /* Tdata for sections in XCOFF files. This is used by the linker. */
211 struct xcoff_section_tdata
213 /* Used for XCOFF csects created by the linker; points to the real
214 XCOFF section which contains this csect. */
216 /* The lineno_count field for the enclosing section, because we are
217 going to clobber it there. */
218 unsigned int lineno_count;
219 /* The first and last symbol indices for symbols used by this csect. */
220 unsigned long first_symndx;
221 unsigned long last_symndx;
224 /* An accessor macro the xcoff_section_tdata structure. */
225 #define xcoff_section_data(abfd, sec) \
226 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
228 /* Tdata for sections in PE files. */
230 struct pei_section_tdata
232 /* The virtual size of the section. */
233 bfd_size_type virt_size;
234 /* The PE section flags. */
238 /* An accessor macro for the pei_section_tdata structure. */
239 #define pei_section_data(abfd, sec) \
240 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
242 /* COFF linker hash table entries. */
244 struct coff_link_hash_entry
246 struct bfd_link_hash_entry root;
248 /* Symbol index in output file. Set to -1 initially. Set to -2 if
249 there is a reloc against this symbol. */
256 unsigned char symbol_class;
258 /* Number of auxiliary entries. */
261 /* BFD to take auxiliary entries from. */
264 /* Pointer to array of auxiliary entries, if any. */
265 union internal_auxent *aux;
267 /* Flag word; legal values follow. */
268 unsigned short coff_link_hash_flags;
269 /* Symbol is a PE section symbol. */
270 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
273 /* COFF linker hash table. */
275 struct coff_link_hash_table
277 struct bfd_link_hash_table root;
278 /* A pointer to information used to link stabs in sections. */
279 struct stab_info stab_info;
282 /* Look up an entry in a COFF linker hash table. */
284 #define coff_link_hash_lookup(table, string, create, copy, follow) \
285 ((struct coff_link_hash_entry *) \
286 bfd_link_hash_lookup (&(table)->root, (string), (create), \
289 /* Traverse a COFF linker hash table. */
291 #define coff_link_hash_traverse(table, func, info) \
292 (bfd_link_hash_traverse \
294 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
297 /* Get the COFF linker hash table from a link_info structure. */
299 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
301 /* Functions in coffgen.c. */
302 extern const bfd_target *coff_object_p
304 extern struct bfd_section *coff_section_from_bfd_index
306 extern long coff_get_symtab_upper_bound
308 extern long coff_canonicalize_symtab
310 extern int coff_count_linenumbers
312 extern struct coff_symbol_struct *coff_symbol_from
314 extern bfd_boolean coff_renumber_symbols
316 extern void coff_mangle_symbols
318 extern bfd_boolean coff_write_symbols
320 extern bfd_boolean coff_write_alien_symbol
321 (bfd *, asymbol *, struct internal_syment *, bfd_vma *,
322 bfd_size_type *, asection **, bfd_size_type *);
323 extern bfd_boolean coff_write_linenumbers
325 extern alent *coff_get_lineno
327 extern asymbol *coff_section_symbol
329 extern bfd_boolean _bfd_coff_get_external_symbols
331 extern const char *_bfd_coff_read_string_table
333 extern bfd_boolean _bfd_coff_free_symbols
335 extern struct coff_ptr_struct *coff_get_normalized_symtab
337 extern long coff_get_reloc_upper_bound
339 extern asymbol *coff_make_empty_symbol
341 extern void coff_print_symbol
342 (bfd *, void * filep, asymbol *, bfd_print_symbol_type);
343 extern void coff_get_symbol_info
344 (bfd *, asymbol *, symbol_info *ret);
345 extern bfd_boolean _bfd_coff_is_local_label_name
346 (bfd *, const char *);
347 extern asymbol *coff_bfd_make_debug_symbol
348 (bfd *, void *, unsigned long);
349 extern bfd_boolean coff_find_nearest_line
350 (bfd *, asection *, asymbol **, bfd_vma, const char **,
351 const char **, unsigned int *);
352 extern bfd_boolean coff_find_nearest_line_discriminator
353 (bfd *, asection *, asymbol **, bfd_vma, const char **,
354 const char **, unsigned int *, unsigned int *);
355 struct dwarf_debug_section;
356 extern bfd_boolean coff_find_nearest_line_with_names
357 (bfd *, const struct dwarf_debug_section *, asection *, asymbol **,
358 bfd_vma, const char **, const char **, unsigned int *);
359 extern bfd_boolean coff_find_inliner_info
360 (bfd *, const char **, const char **, unsigned int *);
361 extern int coff_sizeof_headers
362 (bfd *, struct bfd_link_info *);
363 extern bfd_boolean bfd_coff_reloc16_relax_section
364 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
365 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
366 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
367 bfd_byte *, bfd_boolean, asymbol **);
368 extern bfd_vma bfd_coff_reloc16_get_value
369 (arelent *, struct bfd_link_info *, asection *);
370 extern void bfd_perform_slip
371 (bfd *, unsigned int, asection *, bfd_vma);
373 /* Functions and types in cofflink.c. */
375 #define STRING_SIZE_SIZE 4
377 /* We use a hash table to merge identical enum, struct, and union
378 definitions in the linker. */
380 /* Information we keep for a single element (an enum value, a
381 structure or union field) in the debug merge hash table. */
383 struct coff_debug_merge_element
386 struct coff_debug_merge_element *next;
394 /* Symbol index for complex type. */
398 /* A linked list of debug merge entries for a given name. */
400 struct coff_debug_merge_type
402 /* Next type with the same name. */
403 struct coff_debug_merge_type *next;
408 /* Symbol index where this type is defined. */
411 /* List of elements. */
412 struct coff_debug_merge_element *elements;
415 /* Information we store in the debug merge hash table. */
417 struct coff_debug_merge_hash_entry
419 struct bfd_hash_entry root;
421 /* A list of types with this name. */
422 struct coff_debug_merge_type *types;
425 /* The debug merge hash table. */
427 struct coff_debug_merge_hash_table
429 struct bfd_hash_table root;
432 /* Initialize a COFF debug merge hash table. */
434 #define coff_debug_merge_hash_table_init(table) \
435 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
436 sizeof (struct coff_debug_merge_hash_entry)))
438 /* Free a COFF debug merge hash table. */
440 #define coff_debug_merge_hash_table_free(table) \
441 (bfd_hash_table_free (&(table)->root))
443 /* Look up an entry in a COFF debug merge hash table. */
445 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
446 ((struct coff_debug_merge_hash_entry *) \
447 bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
449 /* Information we keep for each section in the output file when doing
450 a relocatable link. */
452 struct coff_link_section_info
454 /* The relocs to be output. */
455 struct internal_reloc *relocs;
456 /* For each reloc against a global symbol whose index was not known
457 when the reloc was handled, the global hash table entry. */
458 struct coff_link_hash_entry **rel_hashes;
461 /* Information that we pass around while doing the final link step. */
463 struct coff_final_link_info
465 /* General link information. */
466 struct bfd_link_info *info;
469 /* Used to indicate failure in traversal routine. */
471 /* If doing "task linking" set only during the time when we want the
472 global symbol writer to convert the storage class of defined global
473 symbols from global to static. */
474 bfd_boolean global_to_static;
475 /* Hash table for long symbol names. */
476 struct bfd_strtab_hash *strtab;
477 /* When doing a relocatable link, an array of information kept for
478 each output section, indexed by the target_index field. */
479 struct coff_link_section_info *section_info;
480 /* Symbol index of last C_FILE symbol (-1 if none). */
481 long last_file_index;
482 /* Contents of last C_FILE symbol. */
483 struct internal_syment last_file;
484 /* Symbol index of first aux entry of last .bf symbol with an empty
485 endndx field (-1 if none). */
487 /* Contents of last_bf_index aux entry. */
488 union internal_auxent last_bf;
489 /* Hash table used to merge debug information. */
490 struct coff_debug_merge_hash_table debug_merge;
491 /* Buffer large enough to hold swapped symbols of any input file. */
492 struct internal_syment *internal_syms;
493 /* Buffer large enough to hold sections of symbols of any input file. */
495 /* Buffer large enough to hold output indices of symbols of any
498 /* Buffer large enough to hold output symbols for any input file. */
500 /* Buffer large enough to hold external line numbers for any input
503 /* Buffer large enough to hold any input section. */
505 /* Buffer large enough to hold external relocs of any input section. */
506 bfd_byte *external_relocs;
507 /* Buffer large enough to hold swapped relocs of any input section. */
508 struct internal_reloc *internal_relocs;
511 /* Most COFF variants have no way to record the alignment of a
512 section. This struct is used to set a specific alignment based on
513 the name of the section. */
515 struct coff_section_alignment_entry
517 /* The section name. */
520 /* This is either (unsigned int) -1, indicating that the section
521 name must match exactly, or it is the number of letters which
522 must match at the start of the name. */
523 unsigned int comparison_length;
525 /* These macros may be used to fill in the first two fields in a
526 structure initialization. */
527 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
528 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
530 /* Only use this entry if the default section alignment for this
531 target is at least that much (as a power of two). If this field
532 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
533 unsigned int default_alignment_min;
535 /* Only use this entry if the default section alignment for this
536 target is no greater than this (as a power of two). If this
537 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
538 unsigned int default_alignment_max;
540 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
542 /* The desired alignment for this section (as a power of two). */
543 unsigned int alignment_power;
546 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
547 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
548 extern bfd_boolean _bfd_coff_link_hash_table_init
549 (struct coff_link_hash_table *, bfd *,
550 struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
551 struct bfd_hash_table *,
554 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
556 extern const char *_bfd_coff_internal_syment_name
557 (bfd *, const struct internal_syment *, char *);
558 extern bfd_boolean _bfd_coff_section_already_linked
559 (bfd *, asection *, struct bfd_link_info *);
560 extern bfd_boolean _bfd_coff_link_add_symbols
561 (bfd *, struct bfd_link_info *);
562 extern bfd_boolean _bfd_coff_final_link
563 (bfd *, struct bfd_link_info *);
564 extern struct internal_reloc *_bfd_coff_read_internal_relocs
565 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
566 struct internal_reloc *);
567 extern bfd_boolean _bfd_coff_generic_relocate_section
568 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
569 struct internal_reloc *, struct internal_syment *, asection **);
570 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
571 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
572 extern bfd_boolean _bfd_coff_write_global_sym
573 (struct bfd_hash_entry *, void *);
574 extern bfd_boolean _bfd_coff_write_task_globals
575 (struct coff_link_hash_entry *, void *);
576 extern bfd_boolean _bfd_coff_link_input_bfd
577 (struct coff_final_link_info *, bfd *);
578 extern bfd_boolean _bfd_coff_reloc_link_order
579 (bfd *, struct coff_final_link_info *, asection *,
580 struct bfd_link_order *);
583 #define coff_get_section_contents_in_window \
584 _bfd_generic_get_section_contents_in_window
586 /* Functions in xcofflink.c. */
588 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
590 extern long _bfd_xcoff_canonicalize_dynamic_symtab
592 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
594 extern long _bfd_xcoff_canonicalize_dynamic_reloc
595 (bfd *, arelent **, asymbol **);
596 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
598 extern void _bfd_xcoff_bfd_link_hash_table_free
599 (struct bfd_link_hash_table *);
600 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
601 (bfd *, struct bfd_link_info *);
602 extern bfd_boolean _bfd_xcoff_bfd_final_link
603 (bfd *, struct bfd_link_info *);
604 extern bfd_boolean _bfd_xcoff_define_common_symbol
605 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
606 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
607 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
608 struct internal_reloc *, struct internal_syment *, asection **);
610 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the
611 linker, and so should start with bfd and be declared in bfd.h. */
613 extern bfd_boolean ppc_allocate_toc_section
614 (struct bfd_link_info *);
615 extern bfd_boolean ppc_process_before_allocation
616 (bfd *, struct bfd_link_info *);