1 /* BFD COFF object file private structure.
2 Copyright (C) 1990-2017 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. */
29 /* Object file tdata; access macros. */
31 #define coff_data(bfd) ((bfd)->tdata.coff_obj_data)
32 #define obj_pe(bfd) (coff_data (bfd)->pe)
33 #define obj_symbols(bfd) (coff_data (bfd)->symbols)
34 #define obj_sym_filepos(bfd) (coff_data (bfd)->sym_filepos)
35 #define obj_relocbase(bfd) (coff_data (bfd)->relocbase)
36 #define obj_raw_syments(bfd) (coff_data (bfd)->raw_syments)
37 #define obj_raw_syment_count(bfd) (coff_data (bfd)->raw_syment_count)
38 #define obj_convert(bfd) (coff_data (bfd)->conversion_table)
39 #define obj_conv_table_size(bfd) (coff_data (bfd)->conv_table_size)
40 #define obj_coff_external_syms(bfd) (coff_data (bfd)->external_syms)
41 #define obj_coff_keep_syms(bfd) (coff_data (bfd)->keep_syms)
42 #define obj_coff_strings(bfd) (coff_data (bfd)->strings)
43 #define obj_coff_strings_len(bfd) (coff_data (bfd)->strings_len)
44 #define obj_coff_keep_strings(bfd) (coff_data (bfd)->keep_strings)
45 #define obj_coff_sym_hashes(bfd) (coff_data (bfd)->sym_hashes)
46 #define obj_coff_strings_written(bfd) (coff_data (bfd)->strings_written)
47 #define obj_coff_local_toc_table(bfd) (coff_data (bfd)->local_toc_sym_map)
49 /* `Tdata' information kept for COFF files. */
51 typedef struct coff_tdata
53 struct coff_symbol_struct *symbols; /* Symtab for input bfd. */
54 unsigned int *conversion_table;
58 struct coff_ptr_struct *raw_syments;
59 unsigned long raw_syment_count;
61 /* These are only valid once writing has begun. */
62 unsigned long int relocbase;
64 /* These members communicate important constants about the symbol table
65 to GDB's symbol-reading code. These `constants' unfortunately vary
66 from coff implementation to implementation... */
67 unsigned local_n_btmask;
68 unsigned local_n_btshft;
69 unsigned local_n_tmask;
70 unsigned local_n_tshift;
71 unsigned local_symesz;
72 unsigned local_auxesz;
73 unsigned local_linesz;
75 /* The unswapped external symbols. May be NULL. Read by
76 _bfd_coff_get_external_symbols. */
78 /* If this is TRUE, the external_syms may not be freed. */
79 bfd_boolean keep_syms;
81 /* The string table. May be NULL. Read by
82 _bfd_coff_read_string_table. */
84 /* The length of the strings table. For error checking. */
85 bfd_size_type strings_len;
86 /* If this is TRUE, the strings may not be freed. */
87 bfd_boolean keep_strings;
88 /* If this is TRUE, the strings have been written out already. */
89 bfd_boolean strings_written;
91 /* Is this a PE format coff file? */
93 /* Used by the COFF backend linker. */
94 struct coff_link_hash_entry **sym_hashes;
96 /* Used by the pe linker for PowerPC. */
97 int *local_toc_sym_map;
99 struct bfd_link_info *link_info;
101 /* Used by coff_find_nearest_line. */
104 /* A place to stash dwarf2 info for this bfd. */
105 void * dwarf2_find_line_info;
107 /* The timestamp from the COFF file header. */
110 /* Copy of some of the f_flags bits in the COFF filehdr structure,
114 /* coff-stgo32 EXE stub header after BFD tdata has been allocated. Its data
115 is kept in internal_filehdr.go32stub beforehand. */
119 /* Tdata for pe image files. */
120 typedef struct pe_tdata
123 struct internal_extra_pe_aouthdr pe_opthdr;
125 int has_reloc_section;
126 int dont_strip_reloc;
127 bfd_boolean insert_timestamp;
128 bfd_boolean (*in_reloc_p) (bfd *, reloc_howto_type *);
134 bfd_boolean (*after_write_object_contents) (bfd *);
140 #define pe_data(bfd) ((bfd)->tdata.pe_obj_data)
142 /* Tdata for XCOFF files. */
146 /* Basic COFF information. */
149 /* TRUE if this is an XCOFF64 file. */
152 /* TRUE if a large a.out header should be generated. */
153 bfd_boolean full_aouthdr;
158 /* Index of section holding TOC. */
161 /* Index of section holding entry point. */
164 /* .text alignment from optional header. */
165 int text_align_power;
167 /* .data alignment from optional header. */
168 int data_align_power;
170 /* modtype from optional header. */
173 /* cputype from optional header. */
176 /* maxdata from optional header. */
179 /* maxstack from optional header. */
182 /* Used by the XCOFF backend linker. */
185 unsigned int *lineno_counts;
186 unsigned int import_file_id;
189 #define xcoff_data(abfd) ((abfd)->tdata.xcoff_obj_data)
191 /* We take the address of the first element of an asymbol to ensure that the
192 macro is only ever applied to an asymbol. */
193 #define coffsymbol(asymbol) ((coff_symbol_type *)(&((asymbol)->the_bfd)))
195 /* Tdata for sections in XCOFF files. This is used by the linker. */
197 struct xcoff_section_tdata
199 /* Used for XCOFF csects created by the linker; points to the real
200 XCOFF section which contains this csect. */
202 /* The lineno_count field for the enclosing section, because we are
203 going to clobber it there. */
204 unsigned int lineno_count;
205 /* The first and last symbol indices for symbols used by this csect. */
206 unsigned long first_symndx;
207 unsigned long last_symndx;
210 /* An accessor macro the xcoff_section_tdata structure. */
211 #define xcoff_section_data(abfd, sec) \
212 ((struct xcoff_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
214 /* Tdata for sections in PE files. */
216 struct pei_section_tdata
218 /* The virtual size of the section. */
219 bfd_size_type virt_size;
220 /* The PE section flags. */
224 /* An accessor macro for the pei_section_tdata structure. */
225 #define pei_section_data(abfd, sec) \
226 ((struct pei_section_tdata *) coff_section_data ((abfd), (sec))->tdata)
228 /* COFF linker hash table entries. */
230 struct coff_link_hash_entry
232 struct bfd_link_hash_entry root;
234 /* Symbol index in output file. Set to -1 initially. Set to -2 if
235 there is a reloc against this symbol. */
242 unsigned char symbol_class;
244 /* Number of auxiliary entries. */
247 /* BFD to take auxiliary entries from. */
250 /* Pointer to array of auxiliary entries, if any. */
251 union internal_auxent *aux;
253 /* Flag word; legal values follow. */
254 unsigned short coff_link_hash_flags;
255 /* Symbol is a PE section symbol. */
256 #define COFF_LINK_HASH_PE_SECTION_SYMBOL (01)
259 /* COFF linker hash table. */
261 struct coff_link_hash_table
263 struct bfd_link_hash_table root;
264 /* A pointer to information used to link stabs in sections. */
265 struct stab_info stab_info;
268 struct coff_reloc_cookie
270 struct internal_reloc * rels;
271 struct internal_reloc * rel;
272 struct internal_reloc * relend;
273 struct coff_symbol_struct * symbols; /* Symtab for input bfd. */
275 struct coff_link_hash_entry ** sym_hashes;
278 /* Look up an entry in a COFF linker hash table. */
280 #define coff_link_hash_lookup(table, string, create, copy, follow) \
281 ((struct coff_link_hash_entry *) \
282 bfd_link_hash_lookup (&(table)->root, (string), (create), \
285 /* Traverse a COFF linker hash table. */
287 #define coff_link_hash_traverse(table, func, info) \
288 (bfd_link_hash_traverse \
290 (bfd_boolean (*) (struct bfd_link_hash_entry *, void *)) (func), \
293 /* Get the COFF linker hash table from a link_info structure. */
295 #define coff_hash_table(p) ((struct coff_link_hash_table *) ((p)->hash))
297 /* Functions in coffgen.c. */
298 extern const bfd_target *coff_object_p
300 extern struct bfd_section *coff_section_from_bfd_index
302 extern long coff_get_symtab_upper_bound
304 extern long coff_canonicalize_symtab
306 extern int coff_count_linenumbers
308 extern bfd_boolean coff_renumber_symbols
310 extern void coff_mangle_symbols
312 extern bfd_boolean coff_write_symbols
314 extern bfd_boolean coff_write_alien_symbol
315 (bfd *, asymbol *, struct internal_syment *, union internal_auxent *,
316 bfd_vma *, bfd_size_type *, asection **, bfd_size_type *);
317 extern bfd_boolean coff_write_linenumbers
319 extern alent *coff_get_lineno
321 extern asymbol *coff_section_symbol
323 extern bfd_boolean _bfd_coff_get_external_symbols
325 extern const char *_bfd_coff_read_string_table
327 extern bfd_boolean _bfd_coff_free_symbols
329 extern struct coff_ptr_struct *coff_get_normalized_symtab
331 extern long coff_get_reloc_upper_bound
333 extern asymbol *coff_make_empty_symbol
335 extern void coff_print_symbol
336 (bfd *, void * filep, asymbol *, bfd_print_symbol_type);
337 extern void coff_get_symbol_info
338 (bfd *, asymbol *, symbol_info *ret);
339 #define coff_get_symbol_version_string \
340 _bfd_nosymbols_get_symbol_version_string
341 extern bfd_boolean _bfd_coff_is_local_label_name
342 (bfd *, const char *);
343 extern asymbol *coff_bfd_make_debug_symbol
344 (bfd *, void *, unsigned long);
345 extern bfd_boolean coff_find_nearest_line
346 (bfd *, asymbol **, asection *, bfd_vma,
347 const char **, const char **, unsigned int *, unsigned int *);
348 #define coff_find_line _bfd_nosymbols_find_line
349 struct dwarf_debug_section;
350 extern bfd_boolean coff_find_nearest_line_with_names
351 (bfd *, asymbol **, asection *, bfd_vma, const char **, const char **,
352 unsigned int *, const struct dwarf_debug_section *);
353 extern bfd_boolean coff_find_inliner_info
354 (bfd *, const char **, const char **, unsigned int *);
355 extern int coff_sizeof_headers
356 (bfd *, struct bfd_link_info *);
357 extern bfd_boolean bfd_coff_reloc16_relax_section
358 (bfd *, asection *, struct bfd_link_info *, bfd_boolean *);
359 extern bfd_byte *bfd_coff_reloc16_get_relocated_section_contents
360 (bfd *, struct bfd_link_info *, struct bfd_link_order *,
361 bfd_byte *, bfd_boolean, asymbol **);
362 extern bfd_vma bfd_coff_reloc16_get_value
363 (arelent *, struct bfd_link_info *, asection *);
364 extern void bfd_perform_slip
365 (bfd *, unsigned int, asection *, bfd_vma);
367 /* Functions and types in cofflink.c. */
369 #define STRING_SIZE_SIZE 4
371 /* We use a hash table to merge identical enum, struct, and union
372 definitions in the linker. */
374 /* Information we keep for a single element (an enum value, a
375 structure or union field) in the debug merge hash table. */
377 struct coff_debug_merge_element
380 struct coff_debug_merge_element *next;
388 /* Symbol index for complex type. */
392 /* A linked list of debug merge entries for a given name. */
394 struct coff_debug_merge_type
396 /* Next type with the same name. */
397 struct coff_debug_merge_type *next;
402 /* Symbol index where this type is defined. */
405 /* List of elements. */
406 struct coff_debug_merge_element *elements;
409 /* Information we store in the debug merge hash table. */
411 struct coff_debug_merge_hash_entry
413 struct bfd_hash_entry root;
415 /* A list of types with this name. */
416 struct coff_debug_merge_type *types;
419 /* The debug merge hash table. */
421 struct coff_debug_merge_hash_table
423 struct bfd_hash_table root;
426 /* Initialize a COFF debug merge hash table. */
428 #define coff_debug_merge_hash_table_init(table) \
429 (bfd_hash_table_init (&(table)->root, _bfd_coff_debug_merge_hash_newfunc, \
430 sizeof (struct coff_debug_merge_hash_entry)))
432 /* Free a COFF debug merge hash table. */
434 #define coff_debug_merge_hash_table_free(table) \
435 (bfd_hash_table_free (&(table)->root))
437 /* Look up an entry in a COFF debug merge hash table. */
439 #define coff_debug_merge_hash_lookup(table, string, create, copy) \
440 ((struct coff_debug_merge_hash_entry *) \
441 bfd_hash_lookup (&(table)->root, (string), (create), (copy)))
443 /* Information we keep for each section in the output file when doing
444 a relocatable link. */
446 struct coff_link_section_info
448 /* The relocs to be output. */
449 struct internal_reloc *relocs;
450 /* For each reloc against a global symbol whose index was not known
451 when the reloc was handled, the global hash table entry. */
452 struct coff_link_hash_entry **rel_hashes;
455 /* Information that we pass around while doing the final link step. */
457 struct coff_final_link_info
459 /* General link information. */
460 struct bfd_link_info *info;
463 /* Used to indicate failure in traversal routine. */
465 /* If doing "task linking" set only during the time when we want the
466 global symbol writer to convert the storage class of defined global
467 symbols from global to static. */
468 bfd_boolean global_to_static;
469 /* Hash table for long symbol names. */
470 struct bfd_strtab_hash *strtab;
471 /* When doing a relocatable link, an array of information kept for
472 each output section, indexed by the target_index field. */
473 struct coff_link_section_info *section_info;
474 /* Symbol index of last C_FILE symbol (-1 if none). */
475 long last_file_index;
476 /* Contents of last C_FILE symbol. */
477 struct internal_syment last_file;
478 /* Symbol index of first aux entry of last .bf symbol with an empty
479 endndx field (-1 if none). */
481 /* Contents of last_bf_index aux entry. */
482 union internal_auxent last_bf;
483 /* Hash table used to merge debug information. */
484 struct coff_debug_merge_hash_table debug_merge;
485 /* Buffer large enough to hold swapped symbols of any input file. */
486 struct internal_syment *internal_syms;
487 /* Buffer large enough to hold sections of symbols of any input file. */
489 /* Buffer large enough to hold output indices of symbols of any
492 /* Buffer large enough to hold output symbols for any input file. */
494 /* Buffer large enough to hold external line numbers for any input
497 /* Buffer large enough to hold any input section. */
499 /* Buffer large enough to hold external relocs of any input section. */
500 bfd_byte *external_relocs;
501 /* Buffer large enough to hold swapped relocs of any input section. */
502 struct internal_reloc *internal_relocs;
505 /* Most COFF variants have no way to record the alignment of a
506 section. This struct is used to set a specific alignment based on
507 the name of the section. */
509 struct coff_section_alignment_entry
511 /* The section name. */
514 /* This is either (unsigned int) -1, indicating that the section
515 name must match exactly, or it is the number of letters which
516 must match at the start of the name. */
517 unsigned int comparison_length;
519 /* These macros may be used to fill in the first two fields in a
520 structure initialization. */
521 #define COFF_SECTION_NAME_EXACT_MATCH(name) (name), ((unsigned int) -1)
522 #define COFF_SECTION_NAME_PARTIAL_MATCH(name) (name), (sizeof (name) - 1)
524 /* Only use this entry if the default section alignment for this
525 target is at least that much (as a power of two). If this field
526 is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
527 unsigned int default_alignment_min;
529 /* Only use this entry if the default section alignment for this
530 target is no greater than this (as a power of two). If this
531 field is COFF_ALIGNMENT_FIELD_EMPTY, it should be ignored. */
532 unsigned int default_alignment_max;
534 #define COFF_ALIGNMENT_FIELD_EMPTY ((unsigned int) -1)
536 /* The desired alignment for this section (as a power of two). */
537 unsigned int alignment_power;
540 extern struct bfd_hash_entry *_bfd_coff_link_hash_newfunc
541 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
542 extern bfd_boolean _bfd_coff_link_hash_table_init
543 (struct coff_link_hash_table *, bfd *,
544 struct bfd_hash_entry *(*) (struct bfd_hash_entry *,
545 struct bfd_hash_table *,
548 extern struct bfd_link_hash_table *_bfd_coff_link_hash_table_create
550 extern const char *_bfd_coff_internal_syment_name
551 (bfd *, const struct internal_syment *, char *);
552 extern bfd_boolean _bfd_coff_section_already_linked
553 (bfd *, asection *, struct bfd_link_info *);
554 extern bfd_boolean _bfd_coff_link_add_symbols
555 (bfd *, struct bfd_link_info *);
556 extern bfd_boolean _bfd_coff_final_link
557 (bfd *, struct bfd_link_info *);
558 extern struct internal_reloc *_bfd_coff_read_internal_relocs
559 (bfd *, asection *, bfd_boolean, bfd_byte *, bfd_boolean,
560 struct internal_reloc *);
561 extern bfd_boolean _bfd_coff_generic_relocate_section
562 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
563 struct internal_reloc *, struct internal_syment *, asection **);
564 extern struct bfd_hash_entry *_bfd_coff_debug_merge_hash_newfunc
565 (struct bfd_hash_entry *, struct bfd_hash_table *, const char *);
566 extern bfd_boolean _bfd_coff_write_global_sym
567 (struct bfd_hash_entry *, void *);
568 extern bfd_boolean _bfd_coff_write_task_globals
569 (struct coff_link_hash_entry *, void *);
570 extern bfd_boolean _bfd_coff_link_input_bfd
571 (struct coff_final_link_info *, bfd *);
572 extern bfd_boolean _bfd_coff_reloc_link_order
573 (bfd *, struct coff_final_link_info *, asection *,
574 struct bfd_link_order *);
575 extern bfd_boolean bfd_coff_gc_sections
576 (bfd *, struct bfd_link_info *);
579 #define coff_get_section_contents_in_window \
580 _bfd_generic_get_section_contents_in_window
582 /* Functions in xcofflink.c. */
584 extern long _bfd_xcoff_get_dynamic_symtab_upper_bound
586 extern long _bfd_xcoff_canonicalize_dynamic_symtab
588 extern long _bfd_xcoff_get_dynamic_reloc_upper_bound
590 extern long _bfd_xcoff_canonicalize_dynamic_reloc
591 (bfd *, arelent **, asymbol **);
592 extern struct bfd_link_hash_table *_bfd_xcoff_bfd_link_hash_table_create
594 extern bfd_boolean _bfd_xcoff_bfd_link_add_symbols
595 (bfd *, struct bfd_link_info *);
596 extern bfd_boolean _bfd_xcoff_bfd_final_link
597 (bfd *, struct bfd_link_info *);
598 extern bfd_boolean _bfd_xcoff_define_common_symbol
599 (bfd *, struct bfd_link_info *, struct bfd_link_hash_entry *);
600 extern bfd_boolean _bfd_ppc_xcoff_relocate_section
601 (bfd *, struct bfd_link_info *, bfd *, asection *, bfd_byte *,
602 struct internal_reloc *, struct internal_syment *, asection **);
604 /* Functions in coff-ppc.c. FIXME: These are called by pe.em in the
605 linker, and so should start with bfd and be declared in bfd.h. */
607 extern bfd_boolean ppc_allocate_toc_section
608 (struct bfd_link_info *);
609 extern bfd_boolean ppc_process_before_allocation
610 (bfd *, struct bfd_link_info *);