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252b5132 | 1 | /* bfdlink.h -- header file for BFD link routines |
b90efa5b | 2 | Copyright (C) 1993-2015 Free Software Foundation, Inc. |
252b5132 RH |
3 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
4 | ||
e0076ab3 | 5 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 6 | |
e0076ab3 NC |
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 | |
a208b53c | 9 | the Free Software Foundation; either version 3 of the License, or |
e0076ab3 | 10 | (at your option) any later version. |
252b5132 | 11 | |
e0076ab3 NC |
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. | |
252b5132 | 16 | |
e0076ab3 NC |
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 | |
a208b53c NC |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
20 | MA 02110-1301, USA. */ | |
252b5132 RH |
21 | |
22 | #ifndef BFDLINK_H | |
23 | #define BFDLINK_H | |
24 | ||
25 | /* Which symbols to strip during a link. */ | |
26 | enum bfd_link_strip | |
27 | { | |
28 | strip_none, /* Don't strip any symbols. */ | |
29 | strip_debugger, /* Strip debugging symbols. */ | |
30 | strip_some, /* keep_hash is the list of symbols to keep. */ | |
31 | strip_all /* Strip all symbols. */ | |
32 | }; | |
33 | ||
34 | /* Which local symbols to discard during a link. This is irrelevant | |
35 | if strip_all is used. */ | |
36 | enum bfd_link_discard | |
37 | { | |
f5fa8ca2 JJ |
38 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
39 | sections. */ | |
252b5132 RH |
40 | discard_none, /* Don't discard any locals. */ |
41 | discard_l, /* Discard local temporary symbols. */ | |
42 | discard_all /* Discard all locals. */ | |
43 | }; | |
8ea2e4bd NC |
44 | |
45 | /* Describes the type of hash table entry structure being used. | |
46 | Different hash table structure have different fields and so | |
47 | support different linking features. */ | |
48 | enum bfd_link_hash_table_type | |
49 | { | |
50 | bfd_link_generic_hash_table, | |
51 | bfd_link_elf_hash_table | |
52 | }; | |
252b5132 RH |
53 | \f |
54 | /* These are the possible types of an entry in the BFD link hash | |
55 | table. */ | |
56 | ||
57 | enum bfd_link_hash_type | |
58 | { | |
59 | bfd_link_hash_new, /* Symbol is new. */ | |
60 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ | |
61 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ | |
62 | bfd_link_hash_defined, /* Symbol is defined. */ | |
63 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ | |
64 | bfd_link_hash_common, /* Symbol is common. */ | |
65 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ | |
66 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ | |
67 | }; | |
68 | ||
f88dc410 | 69 | enum bfd_link_common_skip_ar_symbols |
f7c33884 NC |
70 | { |
71 | bfd_link_common_skip_none, | |
72 | bfd_link_common_skip_text, | |
73 | bfd_link_common_skip_data, | |
74 | bfd_link_common_skip_all | |
75 | }; | |
76 | ||
a50b1753 NC |
77 | struct bfd_link_hash_common_entry |
78 | { | |
79 | unsigned int alignment_power; /* Alignment. */ | |
80 | asection *section; /* Symbol section. */ | |
81 | }; | |
82 | ||
252b5132 RH |
83 | /* The linking routines use a hash table which uses this structure for |
84 | its elements. */ | |
85 | ||
86 | struct bfd_link_hash_entry | |
87 | { | |
88 | /* Base hash table entry structure. */ | |
89 | struct bfd_hash_entry root; | |
6ad841a1 | 90 | |
252b5132 | 91 | /* Type of this entry. */ |
35ed3f94 AM |
92 | ENUM_BITFIELD (bfd_link_hash_type) type : 8; |
93 | ||
12b2843a AM |
94 | /* Symbol is referenced in a normal object file, as distict from a LTO |
95 | IR object file. */ | |
35ed3f94 | 96 | unsigned int non_ir_ref : 1; |
12b2843a AM |
97 | |
98 | /* Symbol is a built-in define. These will be overridden by PROVIDE | |
99 | in a linker script. */ | |
100 | unsigned int linker_def : 1; | |
252b5132 | 101 | |
252b5132 RH |
102 | /* A union of information depending upon the type. */ |
103 | union | |
104 | { | |
105 | /* Nothing is kept for bfd_hash_new. */ | |
106 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ | |
107 | struct | |
108 | { | |
f6e332e6 AM |
109 | /* Undefined and common symbols are kept in a linked list through |
110 | this field. This field is present in all of the union element | |
111 | so that we don't need to remove entries from the list when we | |
112 | change their type. Removing entries would either require the | |
113 | list to be doubly linked, which would waste more memory, or | |
114 | require a traversal. When an undefined or common symbol is | |
115 | created, it should be added to this list, the head of which is in | |
116 | the link hash table itself. As symbols are defined, they need | |
117 | not be removed from the list; anything which reads the list must | |
118 | doublecheck the symbol type. | |
119 | ||
120 | Weak symbols are not kept on this list. | |
121 | ||
122 | Defined and defweak symbols use this field as a reference marker. | |
123 | If the field is not NULL, or this structure is the tail of the | |
124 | undefined symbol list, the symbol has been referenced. If the | |
125 | symbol is undefined and becomes defined, this field will | |
126 | automatically be non-NULL since the symbol will have been on the | |
127 | undefined symbol list. */ | |
128 | struct bfd_link_hash_entry *next; | |
252b5132 RH |
129 | bfd *abfd; /* BFD symbol was found in. */ |
130 | } undef; | |
131 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ | |
132 | struct | |
133 | { | |
f6e332e6 | 134 | struct bfd_link_hash_entry *next; |
252b5132 | 135 | asection *section; /* Symbol section. */ |
f6e332e6 | 136 | bfd_vma value; /* Symbol value. */ |
252b5132 RH |
137 | } def; |
138 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ | |
139 | struct | |
140 | { | |
f6e332e6 | 141 | struct bfd_link_hash_entry *next; |
252b5132 RH |
142 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
143 | const char *warning; /* Warning (bfd_link_hash_warning only). */ | |
144 | } i; | |
145 | /* bfd_link_hash_common. */ | |
146 | struct | |
147 | { | |
f6e332e6 | 148 | struct bfd_link_hash_entry *next; |
252b5132 | 149 | /* The linker needs to know three things about common |
b34976b6 AM |
150 | symbols: the size, the alignment, and the section in |
151 | which the symbol should be placed. We store the size | |
152 | here, and we allocate a small structure to hold the | |
153 | section and the alignment. The alignment is stored as a | |
154 | power of two. We don't store all the information | |
155 | directly because we don't want to increase the size of | |
156 | the union; this structure is a major space user in the | |
157 | linker. */ | |
a50b1753 | 158 | struct bfd_link_hash_common_entry *p; |
f6e332e6 | 159 | bfd_size_type size; /* Common symbol size. */ |
252b5132 RH |
160 | } c; |
161 | } u; | |
162 | }; | |
163 | ||
164 | /* This is the link hash table. It is a derived class of | |
165 | bfd_hash_table. */ | |
166 | ||
167 | struct bfd_link_hash_table | |
168 | { | |
169 | /* The hash table itself. */ | |
170 | struct bfd_hash_table table; | |
252b5132 RH |
171 | /* A linked list of undefined and common symbols, linked through the |
172 | next field in the bfd_link_hash_entry structure. */ | |
173 | struct bfd_link_hash_entry *undefs; | |
174 | /* Entries are added to the tail of the undefs list. */ | |
175 | struct bfd_link_hash_entry *undefs_tail; | |
d495ab0d AM |
176 | /* Function to free the hash table on closing BFD. */ |
177 | void (*hash_table_free) (bfd *); | |
b9b171fb | 178 | /* The type of the link hash table. */ |
8ea2e4bd | 179 | enum bfd_link_hash_table_type type; |
252b5132 RH |
180 | }; |
181 | ||
b34976b6 | 182 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
252b5132 RH |
183 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
184 | the real symbol. */ | |
185 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup | |
8cf3f354 AM |
186 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
187 | bfd_boolean copy, bfd_boolean follow); | |
252b5132 RH |
188 | |
189 | /* Look up an entry in the main linker hash table if the symbol might | |
190 | be wrapped. This should only be used for references to an | |
191 | undefined symbol, not for definitions of a symbol. */ | |
192 | ||
193 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup | |
8cf3f354 AM |
194 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
195 | bfd_boolean, bfd_boolean); | |
252b5132 | 196 | |
8a5da09b AM |
197 | /* If H is a wrapped symbol, ie. the symbol name starts with "__wrap_" |
198 | and the remainder is found in wrap_hash, return the real symbol. */ | |
199 | ||
200 | extern struct bfd_link_hash_entry *unwrap_hash_lookup | |
201 | (struct bfd_link_info *, bfd *, struct bfd_link_hash_entry *); | |
202 | ||
252b5132 RH |
203 | /* Traverse a link hash table. */ |
204 | extern void bfd_link_hash_traverse | |
8cf3f354 AM |
205 | (struct bfd_link_hash_table *, |
206 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), | |
207 | void *); | |
252b5132 RH |
208 | |
209 | /* Add an entry to the undefs list. */ | |
210 | extern void bfd_link_add_undef | |
8cf3f354 | 211 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
7815cf4f | 212 | |
77cfaee6 AM |
213 | /* Remove symbols from the undefs list that don't belong there. */ |
214 | extern void bfd_link_repair_undef_list | |
215 | (struct bfd_link_hash_table *table); | |
216 | ||
5c1d2f5f AM |
217 | /* Read symbols and cache symbol pointer array in outsymbols. */ |
218 | extern bfd_boolean bfd_generic_link_read_symbols (bfd *); | |
219 | ||
7815cf4f AM |
220 | struct bfd_sym_chain |
221 | { | |
222 | struct bfd_sym_chain *next; | |
223 | const char *name; | |
224 | }; | |
252b5132 | 225 | \f |
560e09e9 NC |
226 | /* How to handle unresolved symbols. |
227 | There are four possibilities which are enumerated below: */ | |
228 | enum report_method | |
229 | { | |
230 | /* This is the initial value when then link_info structure is created. | |
231 | It allows the various stages of the linker to determine whether they | |
232 | allowed to set the value. */ | |
233 | RM_NOT_YET_SET = 0, | |
234 | RM_IGNORE, | |
235 | RM_GENERATE_WARNING, | |
236 | RM_GENERATE_ERROR | |
237 | }; | |
238 | ||
ae17ab41 CM |
239 | typedef enum {with_flags, without_flags} flag_type; |
240 | ||
241 | /* A section flag list. */ | |
242 | struct flag_info_list | |
243 | { | |
d324f6d6 | 244 | flag_type with; |
ae17ab41 CM |
245 | const char *name; |
246 | bfd_boolean valid; | |
247 | struct flag_info_list *next; | |
248 | }; | |
249 | ||
250 | /* Section flag info. */ | |
251 | struct flag_info | |
252 | { | |
253 | flagword only_with_flags; | |
254 | flagword not_with_flags; | |
255 | struct flag_info_list *flag_list; | |
256 | bfd_boolean flags_initialized; | |
257 | }; | |
258 | ||
55255dae | 259 | struct bfd_elf_dynamic_list; |
fd91d419 | 260 | struct bfd_elf_version_tree; |
55255dae | 261 | |
0e1862bb L |
262 | /* Types of output. */ |
263 | ||
264 | enum output_type | |
265 | { | |
266 | type_executable = 0, | |
267 | type_dll, | |
268 | type_relocatable | |
269 | }; | |
270 | ||
271 | #define bfd_link_executable(info) ((info)->type == type_executable) | |
272 | #define bfd_link_dll(info) ((info)->type == type_dll) | |
273 | #define bfd_link_relocatable(info) ((info)->type == type_relocatable) | |
274 | #define bfd_link_pic(info) (info)->pic | |
275 | #define bfd_link_pie(info) (bfd_link_executable (info) \ | |
276 | && bfd_link_pic (info)) | |
277 | ||
252b5132 RH |
278 | /* This structure holds all the information needed to communicate |
279 | between BFD and the linker when doing a link. */ | |
280 | ||
281 | struct bfd_link_info | |
282 | { | |
0e1862bb L |
283 | /* Output type. */ |
284 | ENUM_BITFIELD (output_type) type : 2; | |
7815cf4f | 285 | |
0e1862bb L |
286 | /* TRUE if BFD should generate a position independent object. */ |
287 | unsigned int pic : 1; | |
7815cf4f | 288 | |
b34976b6 | 289 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
cddd0089 | 290 | unsigned int symbolic: 1; |
7815cf4f | 291 | |
05aecedb AM |
292 | /* TRUE if executable should not contain copy relocs. |
293 | Setting this true may result in a non-sharable text segment. */ | |
294 | unsigned int nocopyreloc: 1; | |
295 | ||
b34976b6 | 296 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
7be4069c | 297 | of an executable, rather than only those used. */ |
cddd0089 | 298 | unsigned int export_dynamic: 1; |
7815cf4f | 299 | |
fc0e6df6 PB |
300 | /* TRUE if a default symbol version should be created and used for |
301 | exported symbols. */ | |
3e3b46e5 PB |
302 | unsigned int create_default_symver: 1; |
303 | ||
05aecedb AM |
304 | /* TRUE if unreferenced sections should be removed. */ |
305 | unsigned int gc_sections: 1; | |
cddd0089 AM |
306 | |
307 | /* TRUE if every symbol should be reported back via the notice | |
308 | callback. */ | |
309 | unsigned int notice_all: 1; | |
310 | ||
61f41c3c AM |
311 | /* TRUE if the LTO plugin is active. */ |
312 | unsigned int lto_plugin_active: 1; | |
313 | ||
05aecedb AM |
314 | /* TRUE if global symbols in discarded sections should be stripped. */ |
315 | unsigned int strip_discarded: 1; | |
cddd0089 | 316 | |
05aecedb AM |
317 | /* TRUE if all data symbols should be dynamic. */ |
318 | unsigned int dynamic_data: 1; | |
cddd0089 | 319 | |
05aecedb AM |
320 | /* Which symbols to strip. */ |
321 | ENUM_BITFIELD (bfd_link_strip) strip : 2; | |
31941635 | 322 | |
05aecedb AM |
323 | /* Which local symbols to discard. */ |
324 | ENUM_BITFIELD (bfd_link_discard) discard : 2; | |
c6b64018 | 325 | |
05aecedb AM |
326 | /* Criteria for skipping symbols when determining |
327 | whether to include an object from an archive. */ | |
328 | ENUM_BITFIELD (bfd_link_common_skip_ar_symbols) common_skip_ar_symbols : 2; | |
36af4a4e | 329 | |
05aecedb AM |
330 | /* What to do with unresolved symbols in an object file. |
331 | When producing executables the default is GENERATE_ERROR. | |
332 | When producing shared libraries the default is IGNORE. The | |
333 | assumption with shared libraries is that the reference will be | |
334 | resolved at load/execution time. */ | |
335 | ENUM_BITFIELD (report_method) unresolved_syms_in_objects : 2; | |
36af4a4e | 336 | |
05aecedb AM |
337 | /* What to do with unresolved symbols in a shared library. |
338 | The same defaults apply. */ | |
339 | ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; | |
9ee5e499 | 340 | |
05aecedb AM |
341 | /* TRUE if shared objects should be linked directly, not shared. */ |
342 | unsigned int static_link: 1; | |
343 | ||
344 | /* TRUE if symbols should be retained in memory, FALSE if they | |
345 | should be freed and reread. */ | |
346 | unsigned int keep_memory: 1; | |
347 | ||
348 | /* TRUE if BFD should generate relocation information in the final | |
349 | executable. */ | |
350 | unsigned int emitrelocations: 1; | |
9ee5e499 | 351 | |
8c37241b JJ |
352 | /* TRUE if PT_GNU_RELRO segment should be created. */ |
353 | unsigned int relro: 1; | |
354 | ||
2f0c68f2 CM |
355 | /* Nonzero if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
356 | should be created. 1 for DWARF2 tables, 2 for compact tables. */ | |
357 | unsigned int eh_frame_hdr_type: 2; | |
05aecedb | 358 | |
8fdd7217 NC |
359 | /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
360 | unsigned int warn_shared_textrel: 1; | |
361 | ||
c192a133 AM |
362 | /* TRUE if we should error when adding a DT_TEXTREL. */ |
363 | unsigned int error_textrel: 1; | |
364 | ||
fdc90cb4 JJ |
365 | /* TRUE if .hash section should be created. */ |
366 | unsigned int emit_hash: 1; | |
367 | ||
368 | /* TRUE if .gnu.hash section should be created. */ | |
369 | unsigned int emit_gnu_hash: 1; | |
370 | ||
c0f00686 L |
371 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
372 | cause map file generation to use an O(N^2) algorithm and disable | |
373 | caching ELF symbol buffer. */ | |
374 | unsigned int reduce_memory_overheads: 1; | |
375 | ||
05aecedb AM |
376 | /* TRUE if the output file should be in a traditional format. This |
377 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag | |
378 | on the output file, but may be checked when reading the input | |
379 | files. */ | |
380 | unsigned int traditional_format: 1; | |
40b36307 | 381 | |
05aecedb AM |
382 | /* TRUE if non-PLT relocs should be merged into one reloc section |
383 | and sorted so that relocs against the same symbol come together. */ | |
384 | unsigned int combreloc: 1; | |
385 | ||
386 | /* TRUE if a default symbol version should be created and used for | |
387 | imported symbols. */ | |
388 | unsigned int default_imported_symver: 1; | |
389 | ||
390 | /* TRUE if the new ELF dynamic tags are enabled. */ | |
391 | unsigned int new_dtags: 1; | |
40b36307 | 392 | |
e41b3a13 JJ |
393 | /* FALSE if .eh_frame unwind info should be generated for PLT and other |
394 | linker created sections, TRUE if it should be omitted. */ | |
395 | unsigned int no_ld_generated_unwind_info: 1; | |
396 | ||
05aecedb AM |
397 | /* TRUE if BFD should generate a "task linked" object file, |
398 | similar to relocatable but also with globals converted to | |
399 | statics. */ | |
400 | unsigned int task_link: 1; | |
0c511000 | 401 | |
05aecedb AM |
402 | /* TRUE if ok to have multiple definition. */ |
403 | unsigned int allow_multiple_definition: 1; | |
ab24bc21 | 404 | |
05aecedb AM |
405 | /* TRUE if ok to have version with no definition. */ |
406 | unsigned int allow_undefined_version: 1; | |
560e09e9 | 407 | |
05aecedb AM |
408 | /* TRUE if some symbols have to be dynamic, controlled by |
409 | --dynamic-list command line options. */ | |
410 | unsigned int dynamic: 1; | |
560e09e9 | 411 | |
05aecedb AM |
412 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
413 | flags. */ | |
414 | unsigned int execstack: 1; | |
7815cf4f | 415 | |
05aecedb AM |
416 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W |
417 | flags. */ | |
418 | unsigned int noexecstack: 1; | |
7815cf4f | 419 | |
05aecedb AM |
420 | /* TRUE if we want to produced optimized output files. This might |
421 | need much more time and therefore must be explicitly selected. */ | |
422 | unsigned int optimize: 1; | |
423 | ||
424 | /* TRUE if user should be informed of removed unreferenced sections. */ | |
425 | unsigned int print_gc_sections: 1; | |
426 | ||
427 | /* TRUE if we should warn alternate ELF machine code. */ | |
428 | unsigned int warn_alternate_em: 1; | |
7815cf4f | 429 | |
d324f6d6 RM |
430 | /* TRUE if the linker script contained an explicit PHDRS command. */ |
431 | unsigned int user_phdrs: 1; | |
432 | ||
d258b828 IZ |
433 | /* TRUE if BND prefix in PLT entries is always generated. */ |
434 | unsigned int bndplt: 1; | |
435 | ||
b9cf773d AM |
436 | /* Char that may appear as the first char of a symbol, but should be |
437 | skipped (like symbol_leading_char) when looking up symbols in | |
438 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ | |
439 | char wrap_char; | |
440 | ||
97407faf AM |
441 | /* Separator between archive and filename in linker script filespecs. */ |
442 | char path_separator; | |
443 | ||
0ce398f1 L |
444 | /* Compress DWARF debug sections. */ |
445 | enum compressed_debug_section_type compress_debug; | |
446 | ||
04c3a755 NS |
447 | /* Default stack size. Zero means default (often zero itself), -1 |
448 | means explicitly zero-sized. */ | |
449 | bfd_signed_vma stacksize; | |
450 | ||
4f9d22a0 L |
451 | /* Enable or disable target specific optimizations. |
452 | ||
453 | Not all targets have optimizations to enable. | |
454 | ||
455 | Normally these optimizations are disabled by default but some targets | |
456 | prefer to enable them by default. So this field is a tri-state variable. | |
457 | The values are: | |
458 | ||
459 | zero: Enable the optimizations (either from --relax being specified on | |
460 | the command line or the backend's before_allocation emulation function. | |
461 | ||
462 | positive: The user has requested that these optimizations be disabled. | |
463 | (Via the --no-relax command line option). | |
464 | ||
465 | negative: The optimizations are disabled. (Set when initializing the | |
466 | args_type structure in ldmain.c:main. */ | |
467 | signed int disable_target_specific_optimizations; | |
468 | ||
cddd0089 AM |
469 | /* Function callbacks. */ |
470 | const struct bfd_link_callbacks *callbacks; | |
7815cf4f | 471 | |
252b5132 RH |
472 | /* Hash table handled by BFD. */ |
473 | struct bfd_link_hash_table *hash; | |
7815cf4f | 474 | |
252b5132 RH |
475 | /* Hash table of symbols to keep. This is NULL unless strip is |
476 | strip_some. */ | |
477 | struct bfd_hash_table *keep_hash; | |
7815cf4f | 478 | |
252b5132 | 479 | /* Hash table of symbols to report back via the notice callback. If |
b34976b6 | 480 | this is NULL, and notice_all is FALSE, then no symbols are |
252b5132 RH |
481 | reported back. */ |
482 | struct bfd_hash_table *notice_hash; | |
7815cf4f | 483 | |
252b5132 RH |
484 | /* Hash table of symbols which are being wrapped (the --wrap linker |
485 | option). If this is NULL, no symbols are being wrapped. */ | |
486 | struct bfd_hash_table *wrap_hash; | |
7815cf4f | 487 | |
0e86e20e AM |
488 | /* Hash table of symbols which may be left unresolved during |
489 | a link. If this is NULL, no symbols can be left unresolved. */ | |
490 | struct bfd_hash_table *ignore_hash; | |
491 | ||
f13a99db AM |
492 | /* The output BFD. */ |
493 | bfd *output_bfd; | |
494 | ||
cddd0089 | 495 | /* The list of input BFD's involved in the link. These are chained |
c72f2fb2 | 496 | together via the link.next field. */ |
cddd0089 | 497 | bfd *input_bfds; |
a9a4c53e | 498 | bfd **input_bfds_tail; |
cddd0089 AM |
499 | |
500 | /* If a symbol should be created for each input BFD, this is section | |
501 | where those symbols should be placed. It must be a section in | |
502 | the output BFD. It may be NULL, in which case no such symbols | |
503 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
504 | linker command language. */ | |
505 | asection *create_object_symbols_section; | |
506 | ||
507 | /* List of global symbol names that are starting points for marking | |
508 | sections against garbage collection. */ | |
509 | struct bfd_sym_chain *gc_sym_list; | |
510 | ||
252b5132 | 511 | /* If a base output file is wanted, then this points to it */ |
8cf3f354 | 512 | void *base_file; |
252b5132 | 513 | |
94883c63 MM |
514 | /* The function to call when the executable or shared object is |
515 | loaded. */ | |
516 | const char *init_function; | |
7815cf4f | 517 | |
94883c63 MM |
518 | /* The function to call when the executable or shared object is |
519 | unloaded. */ | |
520 | const char *fini_function; | |
9bfcb6d6 | 521 | |
fbbc3759 L |
522 | /* Number of relaxation passes. Usually only one relaxation pass |
523 | is needed. But a backend can have as many relaxation passes as | |
524 | necessary. During bfd_relax_section call, it is set to the | |
525 | current pass, starting from 0. */ | |
526 | int relax_pass; | |
527 | ||
4a828aab RH |
528 | /* Number of relaxation trips. This number is incremented every |
529 | time the relaxation pass is restarted due to a previous | |
530 | relaxation returning true in *AGAIN. */ | |
531 | int relax_trip; | |
532 | ||
889c2a67 L |
533 | /* > 0 to treat protected data defined in the shared library as |
534 | reference external. 0 to treat it as internal. -1 to let | |
535 | backend to decide. */ | |
536 | int extern_protected_data; | |
537 | ||
b34976b6 | 538 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
e0076ab3 NC |
539 | should be generated/linked against. Set to 1 if this feature |
540 | is explicitly requested by the user, -1 if enabled by default. */ | |
541 | int pei386_auto_import; | |
db6751f2 | 542 | |
2fa9fc65 NC |
543 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
544 | in pei386 DLLs should be generated. Set to 1 if this feature | |
545 | is explicitly requested by the user, -1 if enabled by default. */ | |
546 | int pei386_runtime_pseudo_reloc; | |
547 | ||
db6751f2 | 548 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 549 | unsigned int spare_dynamic_tags; |
f7c33884 | 550 | |
cddd0089 AM |
551 | /* May be used to set DT_FLAGS for ELF. */ |
552 | bfd_vma flags; | |
553 | ||
554 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
555 | bfd_vma flags_1; | |
8c37241b JJ |
556 | |
557 | /* Start and end of RELRO region. */ | |
558 | bfd_vma relro_start, relro_end; | |
55255dae L |
559 | |
560 | /* List of symbols should be dynamic. */ | |
40b36307 | 561 | struct bfd_elf_dynamic_list *dynamic_list; |
fd91d419 L |
562 | |
563 | /* The version information. */ | |
564 | struct bfd_elf_version_tree *version_info; | |
252b5132 RH |
565 | }; |
566 | ||
49fa1e15 AM |
567 | /* This structures holds a set of callback functions. These are called |
568 | by the BFD linker routines. Except for the info functions, the first | |
e1fffbe6 AM |
569 | argument to each callback function is the bfd_link_info structure |
570 | being used and each function returns a boolean value. If the | |
571 | function returns FALSE, then the BFD function which called it should | |
572 | return with a failure indication. */ | |
252b5132 RH |
573 | |
574 | struct bfd_link_callbacks | |
575 | { | |
576 | /* A function which is called when an object is added from an | |
577 | archive. ABFD is the archive element being added. NAME is the | |
578 | name of the symbol which caused the archive element to be pulled | |
5d3236ee DK |
579 | in. This function may set *SUBSBFD to point to an alternative |
580 | BFD from which symbols should in fact be added in place of the | |
581 | original BFD's symbols. */ | |
b34976b6 | 582 | bfd_boolean (*add_archive_element) |
5d3236ee | 583 | (struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); |
252b5132 | 584 | /* A function which is called when a symbol is found with multiple |
24f58f47 AM |
585 | definitions. H is the symbol which is defined multiple times. |
586 | NBFD is the new BFD, NSEC is the new section, and NVAL is the new | |
587 | value. NSEC may be bfd_com_section or bfd_ind_section. */ | |
b34976b6 | 588 | bfd_boolean (*multiple_definition) |
24f58f47 | 589 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
8cf3f354 | 590 | bfd *nbfd, asection *nsec, bfd_vma nval); |
252b5132 | 591 | /* A function which is called when a common symbol is defined |
24f58f47 | 592 | multiple times. H is the symbol appearing multiple times. |
252b5132 RH |
593 | NBFD is the BFD of the new symbol. NTYPE is the type of the new |
594 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
595 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
596 | is the size of the new symbol. */ | |
b34976b6 | 597 | bfd_boolean (*multiple_common) |
24f58f47 | 598 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
8cf3f354 | 599 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); |
252b5132 RH |
600 | /* A function which is called to add a symbol to a set. ENTRY is |
601 | the link hash table entry for the set itself (e.g., | |
602 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
1049f94e | 603 | the set when generating a relocatable file, and is also used to |
252b5132 RH |
604 | get the size of the entry when generating an executable file. |
605 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
b34976b6 | 606 | bfd_boolean (*add_to_set) |
8cf3f354 AM |
607 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
608 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
609 | /* A function which is called when the name of a g++ constructor or |
610 | destructor is found. This is only called by some object file | |
b34976b6 | 611 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
252b5132 | 612 | destructor. This will use BFD_RELOC_CTOR when generating a |
1049f94e | 613 | relocatable file. NAME is the name of the symbol found. ABFD, |
252b5132 | 614 | SECTION and VALUE are the value of the symbol. */ |
b34976b6 | 615 | bfd_boolean (*constructor) |
8cf3f354 AM |
616 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
617 | bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
618 | /* A function which is called to issue a linker warning. For |
619 | example, this is called when there is a reference to a warning | |
620 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
621 | of the symbol which triggered the warning; it may be NULL if | |
622 | there is none. ABFD, SECTION and ADDRESS identify the location | |
623 | which trigerred the warning; either ABFD or SECTION or both may | |
624 | be NULL if the location is not known. */ | |
b34976b6 | 625 | bfd_boolean (*warning) |
8cf3f354 AM |
626 | (struct bfd_link_info *, const char *warning, const char *symbol, |
627 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
628 | /* A function which is called when a relocation is attempted against |
629 | an undefined symbol. NAME is the symbol which is undefined. | |
630 | ABFD, SECTION and ADDRESS identify the location from which the | |
e7f8eadb | 631 | reference is made. IS_FATAL indicates whether an undefined symbol is |
c086cbc6 | 632 | a fatal error or not. In some cases SECTION may be NULL. */ |
b34976b6 | 633 | bfd_boolean (*undefined_symbol) |
8cf3f354 | 634 | (struct bfd_link_info *, const char *name, bfd *abfd, |
e7f8eadb | 635 | asection *section, bfd_vma address, bfd_boolean is_fatal); |
dfeffb9f L |
636 | /* A function which is called when a reloc overflow occurs. ENTRY is |
637 | the link hash table entry for the symbol the reloc is against. | |
638 | NAME is the name of the local symbol or section the reloc is | |
639 | against, RELOC_NAME is the name of the relocation, and ADDEND is | |
640 | any addend that is used. ABFD, SECTION and ADDRESS identify the | |
252b5132 RH |
641 | location at which the overflow occurs; if this is the result of a |
642 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
643 | ABFD will be NULL. */ | |
b34976b6 | 644 | bfd_boolean (*reloc_overflow) |
dfeffb9f L |
645 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
646 | const char *name, const char *reloc_name, bfd_vma addend, | |
647 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 648 | /* A function which is called when a dangerous reloc is performed. |
c17ae8a2 | 649 | MESSAGE is an appropriate message. |
252b5132 RH |
650 | ABFD, SECTION and ADDRESS identify the location at which the |
651 | problem occurred; if this is the result of a | |
652 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
653 | ABFD will be NULL. */ | |
b34976b6 | 654 | bfd_boolean (*reloc_dangerous) |
8cf3f354 AM |
655 | (struct bfd_link_info *, const char *message, |
656 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
657 | /* A function which is called when a reloc is found to be attached |
658 | to a symbol which is not being written out. NAME is the name of | |
659 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
660 | the reloc; if this is the result of a | |
661 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
662 | ABFD will be NULL. */ | |
b34976b6 | 663 | bfd_boolean (*unattached_reloc) |
8cf3f354 AM |
664 | (struct bfd_link_info *, const char *name, |
665 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 666 | /* A function which is called when a symbol in notice_hash is |
46135103 AM |
667 | defined or referenced. H is the symbol, INH the indirect symbol |
668 | if applicable. ABFD, SECTION and ADDRESS are the (new) value of | |
669 | the symbol. If SECTION is bfd_und_section, this is a reference. | |
670 | FLAGS are the symbol BSF_* flags. */ | |
b34976b6 | 671 | bfd_boolean (*notice) |
35ed3f94 | 672 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
46135103 AM |
673 | struct bfd_link_hash_entry *inh, |
674 | bfd *abfd, asection *section, bfd_vma address, flagword flags); | |
49fa1e15 | 675 | /* Error or warning link info message. */ |
e1fffbe6 AM |
676 | void (*einfo) |
677 | (const char *fmt, ...); | |
49fa1e15 AM |
678 | /* General link info message. */ |
679 | void (*info) | |
680 | (const char *fmt, ...); | |
681 | /* Message to be printed in linker map file. */ | |
682 | void (*minfo) | |
683 | (const char *fmt, ...); | |
2889e75b NC |
684 | /* This callback provides a chance for users of the BFD library to |
685 | override its decision about whether to place two adjacent sections | |
686 | into the same segment. */ | |
687 | bfd_boolean (*override_segment_assignment) | |
688 | (struct bfd_link_info *, bfd * abfd, | |
689 | asection * current_section, asection * previous_section, | |
690 | bfd_boolean new_segment); | |
252b5132 RH |
691 | }; |
692 | \f | |
693 | /* The linker builds link_order structures which tell the code how to | |
694 | include input data in the output file. */ | |
695 | ||
696 | /* These are the types of link_order structures. */ | |
697 | ||
698 | enum bfd_link_order_type | |
699 | { | |
700 | bfd_undefined_link_order, /* Undefined. */ | |
701 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
702 | bfd_data_link_order, /* Set to explicit data. */ |
703 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
704 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
705 | }; | |
706 | ||
707 | /* This is the link_order structure itself. These form a chain | |
6ed89c00 | 708 | attached to the output section whose contents they are describing. */ |
252b5132 | 709 | |
b34976b6 | 710 | struct bfd_link_order |
252b5132 RH |
711 | { |
712 | /* Next link_order in chain. */ | |
713 | struct bfd_link_order *next; | |
714 | /* Type of link_order. */ | |
715 | enum bfd_link_order_type type; | |
716 | /* Offset within output section. */ | |
b34976b6 | 717 | bfd_vma offset; |
252b5132 RH |
718 | /* Size within output section. */ |
719 | bfd_size_type size; | |
720 | /* Type specific information. */ | |
b34976b6 | 721 | union |
252b5132 | 722 | { |
b34976b6 | 723 | struct |
252b5132 RH |
724 | { |
725 | /* Section to include. If this is used, then | |
726 | section->output_section must be the section the | |
727 | link_order is attached to, section->output_offset must | |
eea6121a | 728 | equal the link_order offset field, and section->size |
252b5132 RH |
729 | must equal the link_order size field. Maybe these |
730 | restrictions should be relaxed someday. */ | |
731 | asection *section; | |
732 | } indirect; | |
733 | struct | |
734 | { | |
d324f6d6 | 735 | /* Size of contents, or zero when contents should be filled by |
b7761f11 | 736 | the architecture-dependent fill function. |
9a1b9f82 AM |
737 | A non-zero value allows filling of the output section |
738 | with an arbitrary repeated pattern. */ | |
739 | unsigned int size; | |
740 | /* Data to put into file. */ | |
252b5132 RH |
741 | bfd_byte *contents; |
742 | } data; | |
743 | struct | |
744 | { | |
745 | /* Description of reloc to generate. Used for | |
746 | bfd_section_reloc_link_order and | |
747 | bfd_symbol_reloc_link_order. */ | |
748 | struct bfd_link_order_reloc *p; | |
749 | } reloc; | |
750 | } u; | |
751 | }; | |
752 | ||
753 | /* A linker order of type bfd_section_reloc_link_order or | |
754 | bfd_symbol_reloc_link_order means to create a reloc against a | |
755 | section or symbol, respectively. This is used to implement -Ur to | |
756 | generate relocs for the constructor tables. The | |
757 | bfd_link_order_reloc structure describes the reloc that BFD should | |
758 | create. It is similar to a arelent, but I didn't use arelent | |
759 | because the linker does not know anything about most symbols, and | |
760 | any asymbol structure it creates will be partially meaningless. | |
761 | This information could logically be in the bfd_link_order struct, | |
762 | but I didn't want to waste the space since these types of relocs | |
763 | are relatively rare. */ | |
764 | ||
765 | struct bfd_link_order_reloc | |
766 | { | |
767 | /* Reloc type. */ | |
768 | bfd_reloc_code_real_type reloc; | |
769 | ||
770 | union | |
771 | { | |
772 | /* For type bfd_section_reloc_link_order, this is the section | |
773 | the reloc should be against. This must be a section in the | |
774 | output BFD, not any of the input BFDs. */ | |
775 | asection *section; | |
776 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
777 | symbol the reloc should be against. */ | |
778 | const char *name; | |
779 | } u; | |
780 | ||
781 | /* Addend to use. The object file should contain zero. The BFD | |
782 | backend is responsible for filling in the contents of the object | |
783 | file correctly. For some object file formats (e.g., COFF) the | |
784 | addend must be stored into in the object file, and for some | |
785 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
786 | bfd_vma addend; | |
787 | }; | |
788 | ||
789 | /* Allocate a new link_order for a section. */ | |
8cf3f354 | 790 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
252b5132 RH |
791 | |
792 | /* These structures are used to describe version information for the | |
793 | ELF linker. These structures could be manipulated entirely inside | |
794 | BFD, but it would be a pain. Instead, the regular linker sets up | |
795 | these structures, and then passes them into BFD. */ | |
796 | ||
108ba305 | 797 | /* Glob pattern for a version. */ |
252b5132 RH |
798 | |
799 | struct bfd_elf_version_expr | |
800 | { | |
108ba305 | 801 | /* Next glob pattern for this version. */ |
252b5132 | 802 | struct bfd_elf_version_expr *next; |
108ba305 | 803 | /* Glob pattern. */ |
252b5132 | 804 | const char *pattern; |
ae5a3597 AM |
805 | /* Set if pattern is not a glob. */ |
806 | unsigned int literal : 1; | |
31941635 | 807 | /* Defined by ".symver". */ |
108ba305 | 808 | unsigned int symver : 1; |
31941635 L |
809 | /* Defined by version script. */ |
810 | unsigned int script : 1; | |
108ba305 JJ |
811 | /* Pattern type. */ |
812 | #define BFD_ELF_VERSION_C_TYPE 1 | |
813 | #define BFD_ELF_VERSION_CXX_TYPE 2 | |
814 | #define BFD_ELF_VERSION_JAVA_TYPE 4 | |
815 | unsigned int mask : 3; | |
816 | }; | |
817 | ||
818 | struct bfd_elf_version_expr_head | |
819 | { | |
820 | /* List of all patterns, both wildcards and non-wildcards. */ | |
821 | struct bfd_elf_version_expr *list; | |
822 | /* Hash table for non-wildcards. */ | |
823 | void *htab; | |
824 | /* Remaining patterns. */ | |
825 | struct bfd_elf_version_expr *remaining; | |
826 | /* What kind of pattern types are present in list (bitmask). */ | |
827 | unsigned int mask; | |
252b5132 RH |
828 | }; |
829 | ||
830 | /* Version dependencies. */ | |
831 | ||
832 | struct bfd_elf_version_deps | |
833 | { | |
834 | /* Next dependency for this version. */ | |
835 | struct bfd_elf_version_deps *next; | |
836 | /* The version which this version depends upon. */ | |
837 | struct bfd_elf_version_tree *version_needed; | |
838 | }; | |
839 | ||
840 | /* A node in the version tree. */ | |
841 | ||
842 | struct bfd_elf_version_tree | |
843 | { | |
844 | /* Next version. */ | |
845 | struct bfd_elf_version_tree *next; | |
846 | /* Name of this version. */ | |
847 | const char *name; | |
848 | /* Version number. */ | |
849 | unsigned int vernum; | |
850 | /* Regular expressions for global symbols in this version. */ | |
108ba305 | 851 | struct bfd_elf_version_expr_head globals; |
252b5132 | 852 | /* Regular expressions for local symbols in this version. */ |
108ba305 | 853 | struct bfd_elf_version_expr_head locals; |
252b5132 RH |
854 | /* List of versions which this version depends upon. */ |
855 | struct bfd_elf_version_deps *deps; | |
856 | /* Index of the version name. This is used within BFD. */ | |
857 | unsigned int name_indx; | |
858 | /* Whether this version tree was used. This is used within BFD. */ | |
859 | int used; | |
108ba305 JJ |
860 | /* Matching hook. */ |
861 | struct bfd_elf_version_expr *(*match) | |
862 | (struct bfd_elf_version_expr_head *head, | |
863 | struct bfd_elf_version_expr *prev, const char *sym); | |
252b5132 RH |
864 | }; |
865 | ||
55255dae L |
866 | struct bfd_elf_dynamic_list |
867 | { | |
868 | struct bfd_elf_version_expr_head head; | |
869 | struct bfd_elf_version_expr *(*match) | |
870 | (struct bfd_elf_version_expr_head *head, | |
871 | struct bfd_elf_version_expr *prev, const char *sym); | |
872 | }; | |
873 | ||
252b5132 | 874 | #endif |