1 /* BFD COFF object file private structure.
2 Copyright (C) 1990-2019 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. */
32 /* Object file tdata; access macros. */
34 #define coff_data(bfd) ((bfd)->tdata.coff_obj_data)
35 #define obj_pe(bfd) (coff_data (bfd)->pe)
36 #define obj_symbols(bfd) (coff_data (bfd)->symbols)
37 #define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos)
38 #define obj_relocbase(bfd) (coff_data (bfd)->relocbase)
39 #define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments)
40 #define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count)
41 #define obj_convert(bfd) (coff_data (bfd)->conversion_table)
42 #define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size)
43 #define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms)
44 #define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms)
45 #define obj_coff_strings(bfd) (coff_data (bfd)->strings)
46 #define obj_coff_strings_len(bfd) (coff_data (bfd)->strings_len)
47 #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings)
48 #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes)
49 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
50 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
52 /* `Tdata' information kept for COFF files. */
54 typedef struct coff_tdata
56 struct coff_symbol_struct *symbols; /* Symtab for input bfd. */
57 unsigned int *conversion_table;
61 struct coff_ptr_struct *raw_syments;
62 unsigned long raw_syment_count;
64 /* These are only valid once writing has begun. */
65 unsigned long int relocbase;
67 /* These members communicate important constants about the symbol table
68 to GDB's symbol-reading code. These `constants' unfortunately vary
69 from coff implementation to implementation... */
70 unsigned local_n_btmask;
71 unsigned local_n_btshft;
72 unsigned local_n_tmask;
73 unsigned local_n_tshift;
74 unsigned local_symesz;
75 unsigned local_auxesz;
76 unsigned local_linesz;
78 /* The unswapped external symbols. May be NULL. Read by
79 _bfd_coff_get_external_symbols. */
81 /* If this is TRUE, the external_syms may not be freed. */
82 bfd_boolean keep_syms;
84 /* The string table. May be NULL. Read by
85 _bfd_coff_read_string_table. */
87 /* The length of the strings table. For error checking. */
88 bfd_size_type strings_len;
89 /* If this is TRUE, the strings may not be freed. */
90 bfd_boolean keep_strings;
91 /* If this is TRUE, the strings have been written out already. */
92 bfd_boolean strings_written;
94 /* Is this a PE format coff file? */
96 /* Used by the COFF backend linker. */
97 struct coff_link_hash_entry **sym_hashes;
99 /* Used by the pe linker for PowerPC. */
100 int *local_toc_sym_map;
102 struct bfd_link_info *link_info;
104 /* Used by coff_find_nearest_line. */
107 /* A place to stash dwarf2 info for this bfd. */
108 void * dwarf2_find_line_info;
110 /* The timestamp from the COFF file header. */
113 /* Copy of some of the f_flags bits in the COFF filehdr structure,
117 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data
118 is kept in internal_filehdr.go32stub beforehand. */
122 /* Tdata for pe image files. */
123 typedef struct pe_tdata
126 struct internal_extra_pe_aouthdr pe_opthdr;
128 int has_reloc_section;
129 int dont_strip_reloc;
130 bfd_boolean insert_timestamp;
131 bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *);
137 bfd_boolean (*after_write_object_contents) (bfd *);
143 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data)
145 /* Tdata for XCOFF files. */
149 /* Basic COFF information. */
152 /* TRUE if this is an XCOFF64 file. */
155 /* TRUE if a large a.out header should be generated. */
156 bfd_boolean full_aouthdr;
161 /* Index of section holding TOC. */
164 /* Index of section holding entry point. */
167 /* .text alignment from optional header. */
168 int text_align_power;
170 /* .data alignment from optional header. */
171 int data_align_power;
173 /* modtype from optional header. */
176 /* cputype from optional header. */
179 /* maxdata from optional header. */
182 /* maxstack from optional header. */
185 /* Used by the XCOFF backend linker. */
188 unsigned int *lineno_counts;
189 unsigned int import_file_id;
192 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
194 /* We take the address of the first element of an asymbol to ensure that the
195 macro is only ever applied to an asymbol. */
196 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
198 /* Tdata for sections in XCOFF files. This is used by the linker. */
200 struct xcoff_section_tdata
202 /* Used for XCOFF csects created by the linker; points to the real
203 XCOFF section which contains this csect. */
205 /* The lineno_count field for the enclosing section, because we are
206 going to clobber it there. */
207 unsigned int lineno_count;
208 /* The first and last symbol indices for symbols used by this csect. */
209 unsigned long first_symndx;
210 unsigned long last_symndx;
213 /* An accessor macro the xcoff_section_tdata structure. */
214 #define xcoff_section_data(abfd, sec) \
215 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
217 /* Tdata for sections in PE files. */
219 struct pei_section_tdata
221 /* The virtual size of the section. */
222 bfd_size_type virt_size;
223 /* The PE section flags. */
227 /* An accessor macro for the pei_section_tdata structure. */
228 #define pei_section_data(abfd, sec) \
229 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
231 /* COFF linker hash table entries. */
233 struct coff_link_hash_entry
235 struct bfd_link_hash_entry root;
237 /* Symbol index in output file. Set to -1 initially. Set to -2 if
238 there is a reloc against this symbol. */
245 unsigned char symbol_class;
247 /* Number of auxiliary entries. */
250 /* BFD to take auxiliary entries from. */
253 /* Pointer to array of auxiliary entries, if any. */
254 union internal_auxent *aux;
256 /* Flag word; legal values follow. */
257 unsigned short coff_link_hash_flags;
258 /* Symbol is a PE section symbol. */
259 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
262 /* COFF linker hash table. */
264 struct coff_link_hash_table
266 struct bfd_link_hash_table root;
267 /* A pointer to information used to link stabs in sections. */
268 struct stab_info stab_info;
271 struct coff_reloc_cookie
273 struct internal_reloc * rels;
274 struct internal_reloc * rel;
275 struct internal_reloc * relend;
276 struct coff_symbol_struct * symbols; /* Symtab for input bfd. */
278 struct coff_link_hash_entry ** sym_hashes;
281 /* Look up an entry in a COFF linker hash table. */
283 #define coff_link_hash_lookup(table, string, create, copy, follow) \
284 ((struct coff_link_hash_entry *) \
285 bfd_link_hash_lookup (&(table)->root, (string), (create), \
288 /* Traverse a COFF linker hash table. */
290 #define coff_link_hash_traverse(table, func, info) \
291 (bfd_link_hash_traverse \
293 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
296 /* Get the COFF linker hash table from a link_info structure. */
298 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
300 /* Functions in coffgen.c. */
301 extern const bfd_target *coff_object_p
303 extern struct bfd_section *coff_section_from_bfd_index
305 extern long coff_get_symtab_upper_bound
307 extern long coff_canonicalize_symtab
309 extern int coff_count_linenumbers
311 extern bfd_boolean coff_renumber_symbols
313 extern void coff_mangle_symbols
315 extern bfd_boolean coff_write_symbols
317 extern bfd_boolean coff_write_alien_symbol
318 (bfd *, asymbol *, struct internal_syment *, union internal_auxent *,
319 bfd_vma *, bfd_size_type *, asection **, bfd_size_type *);
320 extern bfd_boolean coff_write_linenumbers
322 extern alent *coff_get_lineno
324 extern asymbol *coff_section_symbol
326 extern bfd_boolean _bfd_coff_get_external_symbols
328 extern const char *_bfd_coff_read_string_table
330 extern bfd_boolean _bfd_coff_free_symbols
332 extern struct coff_ptr_struct *coff_get_normalized_symtab
334 extern long coff_get_reloc_upper_bound
336 extern asymbol *coff_make_empty_symbol
338 extern void coff_print_symbol
339 (bfd *, void * filep, asymbol *, bfd_print_symbol_type);
340 extern void coff_get_symbol_info
341 (bfd *, asymbol *, symbol_info *ret);
342 #define coff_get_symbol_version_string \
343 _bfd_nosymbols_get_symbol_version_string
344 extern bfd_boolean _bfd_coff_is_local_label_name
345 (bfd *, const char *);
346 extern asymbol *coff_bfd_make_debug_symbol
347 (bfd *, void *, unsigned long);
348 extern bfd_boolean coff_find_nearest_line
349 (bfd *, asymbol **, asection *, bfd_vma,
350 const char **, const char **, unsigned int *, unsigned int *);
351 #define coff_find_line _bfd_nosymbols_find_line
352 struct dwarf_debug_section;
353 extern bfd_boolean coff_find_nearest_line_with_names
354 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **,
355 unsigned int *, const struct dwarf_debug_section *);
356 extern bfd_boolean coff_find_inliner_info
357 (bfd *, const char **, const char **, unsigned int *);
358 extern int coff_sizeof_headers
359 (bfd *, struct bfd_link_info *);
360 extern bfd_boolean bfd_coff_reloc16_relax_section
361 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
362 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
363 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
364 bfd_byte *, bfd_boolean, asymbol **);
365 extern bfd_vma bfd_coff_reloc16_get_value
366 (arelent *, struct bfd_link_info *, asection *);
367 extern void bfd_perform_slip
368 (bfd *, unsigned int, asection *, bfd_vma);
370 /* Functions and types in cofflink.c. */
372 #define STRING_SIZE_SIZE 4
374 /* We use a hash table to merge identical enum, struct, and union
375 definitions in the linker. */
377 /* Information we keep for a single element (an enum value, a
378 structure or union field) in the debug merge hash table. */
380 struct coff_debug_merge_element
383 struct coff_debug_merge_element *next;
391 /* Symbol index for complex type. */
395 /* A linked list of debug merge entries for a given name. */
397 struct coff_debug_merge_type
399 /* Next type with the same name. */
400 struct coff_debug_merge_type *next;
405 /* Symbol index where this type is defined. */
408 /* List of elements. */
409 struct coff_debug_merge_element *elements;
412 /* Information we store in the debug merge hash table. */
414 struct coff_debug_merge_hash_entry
416 struct bfd_hash_entry root;
418 /* A list of types with this name. */
419 struct coff_debug_merge_type *types;
422 /* The debug merge hash table. */
424 struct coff_debug_merge_hash_table
426 struct bfd_hash_table root;
429 /* Initialize a COFF debug merge hash table. */
431 #define coff_debug_merge_hash_table_init(table) \
432 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
433 sizeof (struct coff_debug_merge_hash_entry)))
435 /* Free a COFF debug merge hash table. */
437 #define coff_debug_merge_hash_table_free(table) \
438 (bfd_hash_table_free (&(table)->root))
440 /* Look up an entry in a COFF debug merge hash table. */
442 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
443 ((struct coff_debug_merge_hash_entry *) \
444 bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
446 /* Information we keep for each section in the output file when doing
447 a relocatable link. */
449 struct coff_link_section_info
451 /* The relocs to be output. */
452 struct internal_reloc *relocs;
453 /* For each reloc against a global symbol whose index was not known
454 when the reloc was handled, the global hash table entry. */
455 struct coff_link_hash_entry **rel_hashes;
458 /* Information that we pass around while doing the final link step. */
460 struct coff_final_link_info
462 /* General link information. */
463 struct bfd_link_info *info;
466 /* Used to indicate failure in traversal routine. */
468 /* If doing "task linking" set only during the time when we want the
469 global symbol writer to convert the storage class of defined global
470 symbols from global to static. */
471 bfd_boolean global_to_static;
472 /* Hash table for long symbol names. */
473 struct bfd_strtab_hash *strtab;
474 /* When doing a relocatable link, an array of information kept for
475 each output section, indexed by the target_index field. */
476 struct coff_link_section_info *section_info;
477 /* Symbol index of last C_FILE symbol (-1 if none). */
478 long last_file_index;
479 /* Contents of last C_FILE symbol. */
480 struct internal_syment last_file;
481 /* Symbol index of first aux entry of last .bf symbol with an empty
482 endndx field (-1 if none). */
484 /* Contents of last_bf_index aux entry. */
485 union internal_auxent last_bf;
486 /* Hash table used to merge debug information. */
487 struct coff_debug_merge_hash_table debug_merge;
488 /* Buffer large enough to hold swapped symbols of any input file. */
489 struct internal_syment *internal_syms;
490 /* Buffer large enough to hold sections of symbols of any input file. */
492 /* Buffer large enough to hold output indices of symbols of any
495 /* Buffer large enough to hold output symbols for any input file. */
497 /* Buffer large enough to hold external line numbers for any input
500 /* Buffer large enough to hold any input section. */
502 /* Buffer large enough to hold external relocs of any input section. */
503 bfd_byte *external_relocs;
504 /* Buffer large enough to hold swapped relocs of any input section. */
505 struct internal_reloc *internal_relocs;
508 /* Most COFF variants have no way to record the alignment of a
509 section. This struct is used to set a specific alignment based on
510 the name of the section. */
512 struct coff_section_alignment_entry
514 /* The section name. */
517 /* This is either (unsigned int) -1, indicating that the section
518 name must match exactly, or it is the number of letters which
519 must match at the start of the name. */
520 unsigned int comparison_length;
522 /* These macros may be used to fill in the first two fields in a
523 structure initialization. */
524 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
525 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
527 /* Only use this entry if the default section alignment for this
528 target is at least that much (as a power of two). If this field
529 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
530 unsigned int default_alignment_min;
532 /* Only use this entry if the default section alignment for this
533 target is no greater than this (as a power of two). If this
534 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
535 unsigned int default_alignment_max;
537 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
539 /* The desired alignment for this section (as a power of two). */
540 unsigned int alignment_power;
543 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
544 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
545 extern bfd_boolean _bfd_coff_link_hash_table_init
546 (struct coff_link_hash_table *, bfd *,
547 struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
548 struct bfd_hash_table *,
551 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
553 extern const char *_bfd_coff_internal_syment_name
554 (bfd *, const struct internal_syment *, char *);
555 extern bfd_boolean _bfd_coff_section_already_linked
556 (bfd *, asection *, struct bfd_link_info *);
557 extern bfd_boolean _bfd_coff_link_add_symbols
558 (bfd *, struct bfd_link_info *);
559 extern bfd_boolean _bfd_coff_final_link
560 (bfd *, struct bfd_link_info *);
561 extern struct internal_reloc *_bfd_coff_read_internal_relocs
562 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
563 struct internal_reloc *);
564 extern bfd_boolean _bfd_coff_generic_relocate_section
565 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
566 struct internal_reloc *, struct internal_syment *, asection **);
567 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
568 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
569 extern bfd_boolean _bfd_coff_write_global_sym
570 (struct bfd_hash_entry *, void *);
571 extern bfd_boolean _bfd_coff_write_task_globals
572 (struct coff_link_hash_entry *, void *);
573 extern bfd_boolean _bfd_coff_link_input_bfd
574 (struct coff_final_link_info *, bfd *);
575 extern bfd_boolean _bfd_coff_reloc_link_order
576 (bfd *, struct coff_final_link_info *, asection *,
577 struct bfd_link_order *);
578 extern bfd_boolean bfd_coff_gc_sections
579 (bfd *, struct bfd_link_info *);
582 #define coff_get_section_contents_in_window \
583 _bfd_generic_get_section_contents_in_window
585 /* Functions in xcofflink.c. */
587 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
589 extern long _bfd_xcoff_canonicalize_dynamic_symtab
591 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
593 extern long _bfd_xcoff_canonicalize_dynamic_reloc
594 (bfd *, arelent **, asymbol **);
595 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
597 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
598 (bfd *, struct bfd_link_info *);
599 extern bfd_boolean _bfd_xcoff_bfd_final_link
600 (bfd *, struct bfd_link_info *);
601 extern bfd_boolean _bfd_xcoff_define_common_symbol
602 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
603 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
604 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
605 struct internal_reloc *, struct internal_syment *, asection **);
607 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the
608 linker, and so should start with bfd and be declared in bfd.h. */
610 extern bfd_boolean ppc_allocate_toc_section
611 (struct bfd_link_info *);
612 extern bfd_boolean ppc_process_before_allocation
613 (bfd *, struct bfd_link_info *);