Commit | Line | Data |
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252b5132 | 1 | /* bfdlink.h -- header file for BFD link routines |
c3aa17e9 | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, |
24f58f47 AM |
3 | 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
4 | Free Software Foundation, Inc. | |
252b5132 RH |
5 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
6 | ||
e0076ab3 | 7 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 8 | |
e0076ab3 NC |
9 | This program is free software; you can redistribute it and/or modify |
10 | it under the terms of the GNU General Public License as published by | |
a208b53c | 11 | the Free Software Foundation; either version 3 of the License, or |
e0076ab3 | 12 | (at your option) any later version. |
252b5132 | 13 | |
e0076ab3 NC |
14 | This program is distributed in the hope that it will be useful, |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
252b5132 | 18 | |
e0076ab3 NC |
19 | You should have received a copy of the GNU General Public License |
20 | along with this program; if not, write to the Free Software | |
a208b53c NC |
21 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
22 | MA 02110-1301, USA. */ | |
252b5132 RH |
23 | |
24 | #ifndef BFDLINK_H | |
25 | #define BFDLINK_H | |
26 | ||
27 | /* Which symbols to strip during a link. */ | |
28 | enum bfd_link_strip | |
29 | { | |
30 | strip_none, /* Don't strip any symbols. */ | |
31 | strip_debugger, /* Strip debugging symbols. */ | |
32 | strip_some, /* keep_hash is the list of symbols to keep. */ | |
33 | strip_all /* Strip all symbols. */ | |
34 | }; | |
35 | ||
36 | /* Which local symbols to discard during a link. This is irrelevant | |
37 | if strip_all is used. */ | |
38 | enum bfd_link_discard | |
39 | { | |
f5fa8ca2 JJ |
40 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
41 | sections. */ | |
252b5132 RH |
42 | discard_none, /* Don't discard any locals. */ |
43 | discard_l, /* Discard local temporary symbols. */ | |
44 | discard_all /* Discard all locals. */ | |
45 | }; | |
8ea2e4bd NC |
46 | |
47 | /* Describes the type of hash table entry structure being used. | |
48 | Different hash table structure have different fields and so | |
49 | support different linking features. */ | |
50 | enum bfd_link_hash_table_type | |
51 | { | |
52 | bfd_link_generic_hash_table, | |
53 | bfd_link_elf_hash_table | |
54 | }; | |
252b5132 RH |
55 | \f |
56 | /* These are the possible types of an entry in the BFD link hash | |
57 | table. */ | |
58 | ||
59 | enum bfd_link_hash_type | |
60 | { | |
61 | bfd_link_hash_new, /* Symbol is new. */ | |
62 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ | |
63 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ | |
64 | bfd_link_hash_defined, /* Symbol is defined. */ | |
65 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ | |
66 | bfd_link_hash_common, /* Symbol is common. */ | |
67 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ | |
68 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ | |
69 | }; | |
70 | ||
f88dc410 | 71 | enum bfd_link_common_skip_ar_symbols |
f7c33884 NC |
72 | { |
73 | bfd_link_common_skip_none, | |
74 | bfd_link_common_skip_text, | |
75 | bfd_link_common_skip_data, | |
76 | bfd_link_common_skip_all | |
77 | }; | |
78 | ||
a50b1753 NC |
79 | struct bfd_link_hash_common_entry |
80 | { | |
81 | unsigned int alignment_power; /* Alignment. */ | |
82 | asection *section; /* Symbol section. */ | |
83 | }; | |
84 | ||
252b5132 RH |
85 | /* The linking routines use a hash table which uses this structure for |
86 | its elements. */ | |
87 | ||
88 | struct bfd_link_hash_entry | |
89 | { | |
90 | /* Base hash table entry structure. */ | |
91 | struct bfd_hash_entry root; | |
6ad841a1 | 92 | |
252b5132 | 93 | /* Type of this entry. */ |
35ed3f94 AM |
94 | ENUM_BITFIELD (bfd_link_hash_type) type : 8; |
95 | ||
96 | unsigned int non_ir_ref : 1; | |
252b5132 | 97 | |
252b5132 RH |
98 | /* A union of information depending upon the type. */ |
99 | union | |
100 | { | |
101 | /* Nothing is kept for bfd_hash_new. */ | |
102 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ | |
103 | struct | |
104 | { | |
f6e332e6 AM |
105 | /* Undefined and common symbols are kept in a linked list through |
106 | this field. This field is present in all of the union element | |
107 | so that we don't need to remove entries from the list when we | |
108 | change their type. Removing entries would either require the | |
109 | list to be doubly linked, which would waste more memory, or | |
110 | require a traversal. When an undefined or common symbol is | |
111 | created, it should be added to this list, the head of which is in | |
112 | the link hash table itself. As symbols are defined, they need | |
113 | not be removed from the list; anything which reads the list must | |
114 | doublecheck the symbol type. | |
115 | ||
116 | Weak symbols are not kept on this list. | |
117 | ||
118 | Defined and defweak symbols use this field as a reference marker. | |
119 | If the field is not NULL, or this structure is the tail of the | |
120 | undefined symbol list, the symbol has been referenced. If the | |
121 | symbol is undefined and becomes defined, this field will | |
122 | automatically be non-NULL since the symbol will have been on the | |
123 | undefined symbol list. */ | |
124 | struct bfd_link_hash_entry *next; | |
252b5132 RH |
125 | bfd *abfd; /* BFD symbol was found in. */ |
126 | } undef; | |
127 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ | |
128 | struct | |
129 | { | |
f6e332e6 | 130 | struct bfd_link_hash_entry *next; |
252b5132 | 131 | asection *section; /* Symbol section. */ |
f6e332e6 | 132 | bfd_vma value; /* Symbol value. */ |
252b5132 RH |
133 | } def; |
134 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ | |
135 | struct | |
136 | { | |
f6e332e6 | 137 | struct bfd_link_hash_entry *next; |
252b5132 RH |
138 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
139 | const char *warning; /* Warning (bfd_link_hash_warning only). */ | |
140 | } i; | |
141 | /* bfd_link_hash_common. */ | |
142 | struct | |
143 | { | |
f6e332e6 | 144 | struct bfd_link_hash_entry *next; |
252b5132 | 145 | /* The linker needs to know three things about common |
b34976b6 AM |
146 | symbols: the size, the alignment, and the section in |
147 | which the symbol should be placed. We store the size | |
148 | here, and we allocate a small structure to hold the | |
149 | section and the alignment. The alignment is stored as a | |
150 | power of two. We don't store all the information | |
151 | directly because we don't want to increase the size of | |
152 | the union; this structure is a major space user in the | |
153 | linker. */ | |
a50b1753 | 154 | struct bfd_link_hash_common_entry *p; |
f6e332e6 | 155 | bfd_size_type size; /* Common symbol size. */ |
252b5132 RH |
156 | } c; |
157 | } u; | |
158 | }; | |
159 | ||
160 | /* This is the link hash table. It is a derived class of | |
161 | bfd_hash_table. */ | |
162 | ||
163 | struct bfd_link_hash_table | |
164 | { | |
165 | /* The hash table itself. */ | |
166 | struct bfd_hash_table table; | |
252b5132 RH |
167 | /* A linked list of undefined and common symbols, linked through the |
168 | next field in the bfd_link_hash_entry structure. */ | |
169 | struct bfd_link_hash_entry *undefs; | |
170 | /* Entries are added to the tail of the undefs list. */ | |
171 | struct bfd_link_hash_entry *undefs_tail; | |
b9b171fb | 172 | /* The type of the link hash table. */ |
8ea2e4bd | 173 | enum bfd_link_hash_table_type type; |
252b5132 RH |
174 | }; |
175 | ||
b34976b6 | 176 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
252b5132 RH |
177 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
178 | the real symbol. */ | |
179 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup | |
8cf3f354 AM |
180 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
181 | bfd_boolean copy, bfd_boolean follow); | |
252b5132 RH |
182 | |
183 | /* Look up an entry in the main linker hash table if the symbol might | |
184 | be wrapped. This should only be used for references to an | |
185 | undefined symbol, not for definitions of a symbol. */ | |
186 | ||
187 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup | |
8cf3f354 AM |
188 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
189 | bfd_boolean, bfd_boolean); | |
252b5132 RH |
190 | |
191 | /* Traverse a link hash table. */ | |
192 | extern void bfd_link_hash_traverse | |
8cf3f354 AM |
193 | (struct bfd_link_hash_table *, |
194 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), | |
195 | void *); | |
252b5132 RH |
196 | |
197 | /* Add an entry to the undefs list. */ | |
198 | extern void bfd_link_add_undef | |
8cf3f354 | 199 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
7815cf4f | 200 | |
77cfaee6 AM |
201 | /* Remove symbols from the undefs list that don't belong there. */ |
202 | extern void bfd_link_repair_undef_list | |
203 | (struct bfd_link_hash_table *table); | |
204 | ||
5c1d2f5f AM |
205 | /* Read symbols and cache symbol pointer array in outsymbols. */ |
206 | extern bfd_boolean bfd_generic_link_read_symbols (bfd *); | |
207 | ||
7815cf4f AM |
208 | struct bfd_sym_chain |
209 | { | |
210 | struct bfd_sym_chain *next; | |
211 | const char *name; | |
212 | }; | |
252b5132 | 213 | \f |
560e09e9 NC |
214 | /* How to handle unresolved symbols. |
215 | There are four possibilities which are enumerated below: */ | |
216 | enum report_method | |
217 | { | |
218 | /* This is the initial value when then link_info structure is created. | |
219 | It allows the various stages of the linker to determine whether they | |
220 | allowed to set the value. */ | |
221 | RM_NOT_YET_SET = 0, | |
222 | RM_IGNORE, | |
223 | RM_GENERATE_WARNING, | |
224 | RM_GENERATE_ERROR | |
225 | }; | |
226 | ||
ae17ab41 CM |
227 | typedef enum {with_flags, without_flags} flag_type; |
228 | ||
229 | /* A section flag list. */ | |
230 | struct flag_info_list | |
231 | { | |
232 | flag_type with; | |
233 | const char *name; | |
234 | bfd_boolean valid; | |
235 | struct flag_info_list *next; | |
236 | }; | |
237 | ||
238 | /* Section flag info. */ | |
239 | struct flag_info | |
240 | { | |
241 | flagword only_with_flags; | |
242 | flagword not_with_flags; | |
243 | struct flag_info_list *flag_list; | |
244 | bfd_boolean flags_initialized; | |
245 | }; | |
246 | ||
55255dae L |
247 | struct bfd_elf_dynamic_list; |
248 | ||
252b5132 RH |
249 | /* This structure holds all the information needed to communicate |
250 | between BFD and the linker when doing a link. */ | |
251 | ||
252 | struct bfd_link_info | |
253 | { | |
05aecedb AM |
254 | /* TRUE if BFD should generate a shared object (or a pie). */ |
255 | unsigned int shared: 1; | |
7815cf4f | 256 | |
05aecedb AM |
257 | /* TRUE if generating an executable, position independent or not. */ |
258 | unsigned int executable : 1; | |
7815cf4f | 259 | |
05aecedb AM |
260 | /* TRUE if generating a position independent executable. */ |
261 | unsigned int pie: 1; | |
7815cf4f | 262 | |
05aecedb AM |
263 | /* TRUE if BFD should generate a relocatable object file. */ |
264 | unsigned int relocatable: 1; | |
7815cf4f | 265 | |
b34976b6 | 266 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
cddd0089 | 267 | unsigned int symbolic: 1; |
7815cf4f | 268 | |
05aecedb AM |
269 | /* TRUE if executable should not contain copy relocs. |
270 | Setting this true may result in a non-sharable text segment. */ | |
271 | unsigned int nocopyreloc: 1; | |
272 | ||
b34976b6 | 273 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
7be4069c | 274 | of an executable, rather than only those used. */ |
cddd0089 | 275 | unsigned int export_dynamic: 1; |
7815cf4f | 276 | |
fc0e6df6 PB |
277 | /* TRUE if a default symbol version should be created and used for |
278 | exported symbols. */ | |
3e3b46e5 PB |
279 | unsigned int create_default_symver: 1; |
280 | ||
05aecedb AM |
281 | /* TRUE if unreferenced sections should be removed. */ |
282 | unsigned int gc_sections: 1; | |
cddd0089 AM |
283 | |
284 | /* TRUE if every symbol should be reported back via the notice | |
285 | callback. */ | |
286 | unsigned int notice_all: 1; | |
287 | ||
05aecedb AM |
288 | /* TRUE if we are loading LTO outputs. */ |
289 | unsigned int loading_lto_outputs: 1; | |
cddd0089 | 290 | |
05aecedb AM |
291 | /* TRUE if global symbols in discarded sections should be stripped. */ |
292 | unsigned int strip_discarded: 1; | |
cddd0089 | 293 | |
05aecedb AM |
294 | /* TRUE if all data symbols should be dynamic. */ |
295 | unsigned int dynamic_data: 1; | |
cddd0089 | 296 | |
05aecedb AM |
297 | /* Which symbols to strip. */ |
298 | ENUM_BITFIELD (bfd_link_strip) strip : 2; | |
31941635 | 299 | |
05aecedb AM |
300 | /* Which local symbols to discard. */ |
301 | ENUM_BITFIELD (bfd_link_discard) discard : 2; | |
c6b64018 | 302 | |
05aecedb AM |
303 | /* Criteria for skipping symbols when determining |
304 | whether to include an object from an archive. */ | |
305 | ENUM_BITFIELD (bfd_link_common_skip_ar_symbols) common_skip_ar_symbols : 2; | |
36af4a4e | 306 | |
05aecedb AM |
307 | /* What to do with unresolved symbols in an object file. |
308 | When producing executables the default is GENERATE_ERROR. | |
309 | When producing shared libraries the default is IGNORE. The | |
310 | assumption with shared libraries is that the reference will be | |
311 | resolved at load/execution time. */ | |
312 | ENUM_BITFIELD (report_method) unresolved_syms_in_objects : 2; | |
36af4a4e | 313 | |
05aecedb AM |
314 | /* What to do with unresolved symbols in a shared library. |
315 | The same defaults apply. */ | |
316 | ENUM_BITFIELD (report_method) unresolved_syms_in_shared_libs : 2; | |
9ee5e499 | 317 | |
05aecedb AM |
318 | /* TRUE if shared objects should be linked directly, not shared. */ |
319 | unsigned int static_link: 1; | |
320 | ||
321 | /* TRUE if symbols should be retained in memory, FALSE if they | |
322 | should be freed and reread. */ | |
323 | unsigned int keep_memory: 1; | |
324 | ||
325 | /* TRUE if BFD should generate relocation information in the final | |
326 | executable. */ | |
327 | unsigned int emitrelocations: 1; | |
9ee5e499 | 328 | |
8c37241b JJ |
329 | /* TRUE if PT_GNU_RELRO segment should be created. */ |
330 | unsigned int relro: 1; | |
331 | ||
05aecedb AM |
332 | /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
333 | should be created. */ | |
334 | unsigned int eh_frame_hdr: 1; | |
335 | ||
8fdd7217 NC |
336 | /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
337 | unsigned int warn_shared_textrel: 1; | |
338 | ||
fdc90cb4 JJ |
339 | /* TRUE if .hash section should be created. */ |
340 | unsigned int emit_hash: 1; | |
341 | ||
342 | /* TRUE if .gnu.hash section should be created. */ | |
343 | unsigned int emit_gnu_hash: 1; | |
344 | ||
c0f00686 L |
345 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
346 | cause map file generation to use an O(N^2) algorithm and disable | |
347 | caching ELF symbol buffer. */ | |
348 | unsigned int reduce_memory_overheads: 1; | |
349 | ||
05aecedb AM |
350 | /* TRUE if the output file should be in a traditional format. This |
351 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag | |
352 | on the output file, but may be checked when reading the input | |
353 | files. */ | |
354 | unsigned int traditional_format: 1; | |
40b36307 | 355 | |
05aecedb AM |
356 | /* TRUE if non-PLT relocs should be merged into one reloc section |
357 | and sorted so that relocs against the same symbol come together. */ | |
358 | unsigned int combreloc: 1; | |
359 | ||
360 | /* TRUE if a default symbol version should be created and used for | |
361 | imported symbols. */ | |
362 | unsigned int default_imported_symver: 1; | |
363 | ||
364 | /* TRUE if the new ELF dynamic tags are enabled. */ | |
365 | unsigned int new_dtags: 1; | |
40b36307 | 366 | |
e41b3a13 JJ |
367 | /* FALSE if .eh_frame unwind info should be generated for PLT and other |
368 | linker created sections, TRUE if it should be omitted. */ | |
369 | unsigned int no_ld_generated_unwind_info: 1; | |
370 | ||
05aecedb AM |
371 | /* TRUE if BFD should generate a "task linked" object file, |
372 | similar to relocatable but also with globals converted to | |
373 | statics. */ | |
374 | unsigned int task_link: 1; | |
0c511000 | 375 | |
05aecedb AM |
376 | /* TRUE if ok to have multiple definition. */ |
377 | unsigned int allow_multiple_definition: 1; | |
ab24bc21 | 378 | |
05aecedb AM |
379 | /* TRUE if ok to have version with no definition. */ |
380 | unsigned int allow_undefined_version: 1; | |
560e09e9 | 381 | |
05aecedb AM |
382 | /* TRUE if some symbols have to be dynamic, controlled by |
383 | --dynamic-list command line options. */ | |
384 | unsigned int dynamic: 1; | |
560e09e9 | 385 | |
05aecedb AM |
386 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
387 | flags. */ | |
388 | unsigned int execstack: 1; | |
7815cf4f | 389 | |
05aecedb AM |
390 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W |
391 | flags. */ | |
392 | unsigned int noexecstack: 1; | |
7815cf4f | 393 | |
05aecedb AM |
394 | /* TRUE if we want to produced optimized output files. This might |
395 | need much more time and therefore must be explicitly selected. */ | |
396 | unsigned int optimize: 1; | |
397 | ||
398 | /* TRUE if user should be informed of removed unreferenced sections. */ | |
399 | unsigned int print_gc_sections: 1; | |
400 | ||
401 | /* TRUE if we should warn alternate ELF machine code. */ | |
402 | unsigned int warn_alternate_em: 1; | |
7815cf4f | 403 | |
b9cf773d AM |
404 | /* Char that may appear as the first char of a symbol, but should be |
405 | skipped (like symbol_leading_char) when looking up symbols in | |
406 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ | |
407 | char wrap_char; | |
408 | ||
97407faf AM |
409 | /* Separator between archive and filename in linker script filespecs. */ |
410 | char path_separator; | |
411 | ||
cddd0089 AM |
412 | /* Function callbacks. */ |
413 | const struct bfd_link_callbacks *callbacks; | |
7815cf4f | 414 | |
252b5132 RH |
415 | /* Hash table handled by BFD. */ |
416 | struct bfd_link_hash_table *hash; | |
7815cf4f | 417 | |
252b5132 RH |
418 | /* Hash table of symbols to keep. This is NULL unless strip is |
419 | strip_some. */ | |
420 | struct bfd_hash_table *keep_hash; | |
7815cf4f | 421 | |
252b5132 | 422 | /* Hash table of symbols to report back via the notice callback. If |
b34976b6 | 423 | this is NULL, and notice_all is FALSE, then no symbols are |
252b5132 RH |
424 | reported back. */ |
425 | struct bfd_hash_table *notice_hash; | |
7815cf4f | 426 | |
252b5132 RH |
427 | /* Hash table of symbols which are being wrapped (the --wrap linker |
428 | option). If this is NULL, no symbols are being wrapped. */ | |
429 | struct bfd_hash_table *wrap_hash; | |
7815cf4f | 430 | |
f13a99db AM |
431 | /* The output BFD. */ |
432 | bfd *output_bfd; | |
433 | ||
cddd0089 AM |
434 | /* The list of input BFD's involved in the link. These are chained |
435 | together via the link_next field. */ | |
436 | bfd *input_bfds; | |
a9a4c53e | 437 | bfd **input_bfds_tail; |
cddd0089 | 438 | |
05aecedb AM |
439 | /* Non-NULL if .note.gnu.build-id section should be created. */ |
440 | char *emit_note_gnu_build_id; | |
441 | ||
cddd0089 AM |
442 | /* If a symbol should be created for each input BFD, this is section |
443 | where those symbols should be placed. It must be a section in | |
444 | the output BFD. It may be NULL, in which case no such symbols | |
445 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
446 | linker command language. */ | |
447 | asection *create_object_symbols_section; | |
448 | ||
449 | /* List of global symbol names that are starting points for marking | |
450 | sections against garbage collection. */ | |
451 | struct bfd_sym_chain *gc_sym_list; | |
452 | ||
252b5132 | 453 | /* If a base output file is wanted, then this points to it */ |
8cf3f354 | 454 | void *base_file; |
252b5132 | 455 | |
94883c63 MM |
456 | /* The function to call when the executable or shared object is |
457 | loaded. */ | |
458 | const char *init_function; | |
7815cf4f | 459 | |
94883c63 MM |
460 | /* The function to call when the executable or shared object is |
461 | unloaded. */ | |
462 | const char *fini_function; | |
9bfcb6d6 | 463 | |
fbbc3759 L |
464 | /* Number of relaxation passes. Usually only one relaxation pass |
465 | is needed. But a backend can have as many relaxation passes as | |
466 | necessary. During bfd_relax_section call, it is set to the | |
467 | current pass, starting from 0. */ | |
468 | int relax_pass; | |
469 | ||
4a828aab RH |
470 | /* Number of relaxation trips. This number is incremented every |
471 | time the relaxation pass is restarted due to a previous | |
472 | relaxation returning true in *AGAIN. */ | |
473 | int relax_trip; | |
474 | ||
b34976b6 | 475 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
e0076ab3 NC |
476 | should be generated/linked against. Set to 1 if this feature |
477 | is explicitly requested by the user, -1 if enabled by default. */ | |
478 | int pei386_auto_import; | |
db6751f2 | 479 | |
2fa9fc65 NC |
480 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
481 | in pei386 DLLs should be generated. Set to 1 if this feature | |
482 | is explicitly requested by the user, -1 if enabled by default. */ | |
483 | int pei386_runtime_pseudo_reloc; | |
484 | ||
db6751f2 | 485 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 486 | unsigned int spare_dynamic_tags; |
f7c33884 | 487 | |
cddd0089 AM |
488 | /* May be used to set DT_FLAGS for ELF. */ |
489 | bfd_vma flags; | |
490 | ||
491 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
492 | bfd_vma flags_1; | |
8c37241b JJ |
493 | |
494 | /* Start and end of RELRO region. */ | |
495 | bfd_vma relro_start, relro_end; | |
55255dae L |
496 | |
497 | /* List of symbols should be dynamic. */ | |
40b36307 | 498 | struct bfd_elf_dynamic_list *dynamic_list; |
252b5132 RH |
499 | }; |
500 | ||
49fa1e15 AM |
501 | /* This structures holds a set of callback functions. These are called |
502 | by the BFD linker routines. Except for the info functions, the first | |
e1fffbe6 AM |
503 | argument to each callback function is the bfd_link_info structure |
504 | being used and each function returns a boolean value. If the | |
505 | function returns FALSE, then the BFD function which called it should | |
506 | return with a failure indication. */ | |
252b5132 RH |
507 | |
508 | struct bfd_link_callbacks | |
509 | { | |
510 | /* A function which is called when an object is added from an | |
511 | archive. ABFD is the archive element being added. NAME is the | |
512 | name of the symbol which caused the archive element to be pulled | |
5d3236ee DK |
513 | in. This function may set *SUBSBFD to point to an alternative |
514 | BFD from which symbols should in fact be added in place of the | |
515 | original BFD's symbols. */ | |
b34976b6 | 516 | bfd_boolean (*add_archive_element) |
5d3236ee | 517 | (struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); |
252b5132 | 518 | /* A function which is called when a symbol is found with multiple |
24f58f47 AM |
519 | definitions. H is the symbol which is defined multiple times. |
520 | NBFD is the new BFD, NSEC is the new section, and NVAL is the new | |
521 | value. NSEC may be bfd_com_section or bfd_ind_section. */ | |
b34976b6 | 522 | bfd_boolean (*multiple_definition) |
24f58f47 | 523 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
8cf3f354 | 524 | bfd *nbfd, asection *nsec, bfd_vma nval); |
252b5132 | 525 | /* A function which is called when a common symbol is defined |
24f58f47 | 526 | multiple times. H is the symbol appearing multiple times. |
252b5132 RH |
527 | NBFD is the BFD of the new symbol. NTYPE is the type of the new |
528 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
529 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
530 | is the size of the new symbol. */ | |
b34976b6 | 531 | bfd_boolean (*multiple_common) |
24f58f47 | 532 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
8cf3f354 | 533 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); |
252b5132 RH |
534 | /* A function which is called to add a symbol to a set. ENTRY is |
535 | the link hash table entry for the set itself (e.g., | |
536 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
1049f94e | 537 | the set when generating a relocatable file, and is also used to |
252b5132 RH |
538 | get the size of the entry when generating an executable file. |
539 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
b34976b6 | 540 | bfd_boolean (*add_to_set) |
8cf3f354 AM |
541 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
542 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
543 | /* A function which is called when the name of a g++ constructor or |
544 | destructor is found. This is only called by some object file | |
b34976b6 | 545 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
252b5132 | 546 | destructor. This will use BFD_RELOC_CTOR when generating a |
1049f94e | 547 | relocatable file. NAME is the name of the symbol found. ABFD, |
252b5132 | 548 | SECTION and VALUE are the value of the symbol. */ |
b34976b6 | 549 | bfd_boolean (*constructor) |
8cf3f354 AM |
550 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
551 | bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
552 | /* A function which is called to issue a linker warning. For |
553 | example, this is called when there is a reference to a warning | |
554 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
555 | of the symbol which triggered the warning; it may be NULL if | |
556 | there is none. ABFD, SECTION and ADDRESS identify the location | |
557 | which trigerred the warning; either ABFD or SECTION or both may | |
558 | be NULL if the location is not known. */ | |
b34976b6 | 559 | bfd_boolean (*warning) |
8cf3f354 AM |
560 | (struct bfd_link_info *, const char *warning, const char *symbol, |
561 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
562 | /* A function which is called when a relocation is attempted against |
563 | an undefined symbol. NAME is the symbol which is undefined. | |
564 | ABFD, SECTION and ADDRESS identify the location from which the | |
e7f8eadb | 565 | reference is made. IS_FATAL indicates whether an undefined symbol is |
c086cbc6 | 566 | a fatal error or not. In some cases SECTION may be NULL. */ |
b34976b6 | 567 | bfd_boolean (*undefined_symbol) |
8cf3f354 | 568 | (struct bfd_link_info *, const char *name, bfd *abfd, |
e7f8eadb | 569 | asection *section, bfd_vma address, bfd_boolean is_fatal); |
dfeffb9f L |
570 | /* A function which is called when a reloc overflow occurs. ENTRY is |
571 | the link hash table entry for the symbol the reloc is against. | |
572 | NAME is the name of the local symbol or section the reloc is | |
573 | against, RELOC_NAME is the name of the relocation, and ADDEND is | |
574 | any addend that is used. ABFD, SECTION and ADDRESS identify the | |
252b5132 RH |
575 | location at which the overflow occurs; if this is the result of a |
576 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
577 | ABFD will be NULL. */ | |
b34976b6 | 578 | bfd_boolean (*reloc_overflow) |
dfeffb9f L |
579 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
580 | const char *name, const char *reloc_name, bfd_vma addend, | |
581 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 582 | /* A function which is called when a dangerous reloc is performed. |
c17ae8a2 | 583 | MESSAGE is an appropriate message. |
252b5132 RH |
584 | ABFD, SECTION and ADDRESS identify the location at which the |
585 | problem occurred; if this is the result of a | |
586 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
587 | ABFD will be NULL. */ | |
b34976b6 | 588 | bfd_boolean (*reloc_dangerous) |
8cf3f354 AM |
589 | (struct bfd_link_info *, const char *message, |
590 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
591 | /* A function which is called when a reloc is found to be attached |
592 | to a symbol which is not being written out. NAME is the name of | |
593 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
594 | the reloc; if this is the result of a | |
595 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
596 | ABFD will be NULL. */ | |
b34976b6 | 597 | bfd_boolean (*unattached_reloc) |
8cf3f354 AM |
598 | (struct bfd_link_info *, const char *name, |
599 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 600 | /* A function which is called when a symbol in notice_hash is |
35ed3f94 AM |
601 | defined or referenced. H is the symbol. ABFD, SECTION and |
602 | ADDRESS are the (new) value of the symbol. If SECTION is | |
16d96b5b AM |
603 | bfd_und_section, this is a reference. FLAGS are the symbol |
604 | BSF_* flags. STRING is the name of the symbol to indirect to if | |
605 | the sym is indirect, or the warning string if a warning sym. */ | |
b34976b6 | 606 | bfd_boolean (*notice) |
35ed3f94 | 607 | (struct bfd_link_info *, struct bfd_link_hash_entry *h, |
16d96b5b AM |
608 | bfd *abfd, asection *section, bfd_vma address, flagword flags, |
609 | const char *string); | |
49fa1e15 | 610 | /* Error or warning link info message. */ |
e1fffbe6 AM |
611 | void (*einfo) |
612 | (const char *fmt, ...); | |
49fa1e15 AM |
613 | /* General link info message. */ |
614 | void (*info) | |
615 | (const char *fmt, ...); | |
616 | /* Message to be printed in linker map file. */ | |
617 | void (*minfo) | |
618 | (const char *fmt, ...); | |
2889e75b NC |
619 | /* This callback provides a chance for users of the BFD library to |
620 | override its decision about whether to place two adjacent sections | |
621 | into the same segment. */ | |
622 | bfd_boolean (*override_segment_assignment) | |
623 | (struct bfd_link_info *, bfd * abfd, | |
624 | asection * current_section, asection * previous_section, | |
625 | bfd_boolean new_segment); | |
252b5132 RH |
626 | }; |
627 | \f | |
628 | /* The linker builds link_order structures which tell the code how to | |
629 | include input data in the output file. */ | |
630 | ||
631 | /* These are the types of link_order structures. */ | |
632 | ||
633 | enum bfd_link_order_type | |
634 | { | |
635 | bfd_undefined_link_order, /* Undefined. */ | |
636 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
637 | bfd_data_link_order, /* Set to explicit data. */ |
638 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
639 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
640 | }; | |
641 | ||
642 | /* This is the link_order structure itself. These form a chain | |
6ed89c00 | 643 | attached to the output section whose contents they are describing. */ |
252b5132 | 644 | |
b34976b6 | 645 | struct bfd_link_order |
252b5132 RH |
646 | { |
647 | /* Next link_order in chain. */ | |
648 | struct bfd_link_order *next; | |
649 | /* Type of link_order. */ | |
650 | enum bfd_link_order_type type; | |
651 | /* Offset within output section. */ | |
b34976b6 | 652 | bfd_vma offset; |
252b5132 RH |
653 | /* Size within output section. */ |
654 | bfd_size_type size; | |
655 | /* Type specific information. */ | |
b34976b6 | 656 | union |
252b5132 | 657 | { |
b34976b6 | 658 | struct |
252b5132 RH |
659 | { |
660 | /* Section to include. If this is used, then | |
661 | section->output_section must be the section the | |
662 | link_order is attached to, section->output_offset must | |
eea6121a | 663 | equal the link_order offset field, and section->size |
252b5132 RH |
664 | must equal the link_order size field. Maybe these |
665 | restrictions should be relaxed someday. */ | |
666 | asection *section; | |
667 | } indirect; | |
668 | struct | |
669 | { | |
9a1b9f82 AM |
670 | /* Size of contents, or zero when contents size == size |
671 | within output section. | |
672 | A non-zero value allows filling of the output section | |
673 | with an arbitrary repeated pattern. */ | |
674 | unsigned int size; | |
675 | /* Data to put into file. */ | |
252b5132 RH |
676 | bfd_byte *contents; |
677 | } data; | |
678 | struct | |
679 | { | |
680 | /* Description of reloc to generate. Used for | |
681 | bfd_section_reloc_link_order and | |
682 | bfd_symbol_reloc_link_order. */ | |
683 | struct bfd_link_order_reloc *p; | |
684 | } reloc; | |
685 | } u; | |
686 | }; | |
687 | ||
688 | /* A linker order of type bfd_section_reloc_link_order or | |
689 | bfd_symbol_reloc_link_order means to create a reloc against a | |
690 | section or symbol, respectively. This is used to implement -Ur to | |
691 | generate relocs for the constructor tables. The | |
692 | bfd_link_order_reloc structure describes the reloc that BFD should | |
693 | create. It is similar to a arelent, but I didn't use arelent | |
694 | because the linker does not know anything about most symbols, and | |
695 | any asymbol structure it creates will be partially meaningless. | |
696 | This information could logically be in the bfd_link_order struct, | |
697 | but I didn't want to waste the space since these types of relocs | |
698 | are relatively rare. */ | |
699 | ||
700 | struct bfd_link_order_reloc | |
701 | { | |
702 | /* Reloc type. */ | |
703 | bfd_reloc_code_real_type reloc; | |
704 | ||
705 | union | |
706 | { | |
707 | /* For type bfd_section_reloc_link_order, this is the section | |
708 | the reloc should be against. This must be a section in the | |
709 | output BFD, not any of the input BFDs. */ | |
710 | asection *section; | |
711 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
712 | symbol the reloc should be against. */ | |
713 | const char *name; | |
714 | } u; | |
715 | ||
716 | /* Addend to use. The object file should contain zero. The BFD | |
717 | backend is responsible for filling in the contents of the object | |
718 | file correctly. For some object file formats (e.g., COFF) the | |
719 | addend must be stored into in the object file, and for some | |
720 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
721 | bfd_vma addend; | |
722 | }; | |
723 | ||
724 | /* Allocate a new link_order for a section. */ | |
8cf3f354 | 725 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
252b5132 RH |
726 | |
727 | /* These structures are used to describe version information for the | |
728 | ELF linker. These structures could be manipulated entirely inside | |
729 | BFD, but it would be a pain. Instead, the regular linker sets up | |
730 | these structures, and then passes them into BFD. */ | |
731 | ||
108ba305 | 732 | /* Glob pattern for a version. */ |
252b5132 RH |
733 | |
734 | struct bfd_elf_version_expr | |
735 | { | |
108ba305 | 736 | /* Next glob pattern for this version. */ |
252b5132 | 737 | struct bfd_elf_version_expr *next; |
108ba305 | 738 | /* Glob pattern. */ |
252b5132 | 739 | const char *pattern; |
ae5a3597 AM |
740 | /* Set if pattern is not a glob. */ |
741 | unsigned int literal : 1; | |
31941635 | 742 | /* Defined by ".symver". */ |
108ba305 | 743 | unsigned int symver : 1; |
31941635 L |
744 | /* Defined by version script. */ |
745 | unsigned int script : 1; | |
108ba305 JJ |
746 | /* Pattern type. */ |
747 | #define BFD_ELF_VERSION_C_TYPE 1 | |
748 | #define BFD_ELF_VERSION_CXX_TYPE 2 | |
749 | #define BFD_ELF_VERSION_JAVA_TYPE 4 | |
750 | unsigned int mask : 3; | |
751 | }; | |
752 | ||
753 | struct bfd_elf_version_expr_head | |
754 | { | |
755 | /* List of all patterns, both wildcards and non-wildcards. */ | |
756 | struct bfd_elf_version_expr *list; | |
757 | /* Hash table for non-wildcards. */ | |
758 | void *htab; | |
759 | /* Remaining patterns. */ | |
760 | struct bfd_elf_version_expr *remaining; | |
761 | /* What kind of pattern types are present in list (bitmask). */ | |
762 | unsigned int mask; | |
252b5132 RH |
763 | }; |
764 | ||
765 | /* Version dependencies. */ | |
766 | ||
767 | struct bfd_elf_version_deps | |
768 | { | |
769 | /* Next dependency for this version. */ | |
770 | struct bfd_elf_version_deps *next; | |
771 | /* The version which this version depends upon. */ | |
772 | struct bfd_elf_version_tree *version_needed; | |
773 | }; | |
774 | ||
775 | /* A node in the version tree. */ | |
776 | ||
777 | struct bfd_elf_version_tree | |
778 | { | |
779 | /* Next version. */ | |
780 | struct bfd_elf_version_tree *next; | |
781 | /* Name of this version. */ | |
782 | const char *name; | |
783 | /* Version number. */ | |
784 | unsigned int vernum; | |
785 | /* Regular expressions for global symbols in this version. */ | |
108ba305 | 786 | struct bfd_elf_version_expr_head globals; |
252b5132 | 787 | /* Regular expressions for local symbols in this version. */ |
108ba305 | 788 | struct bfd_elf_version_expr_head locals; |
252b5132 RH |
789 | /* List of versions which this version depends upon. */ |
790 | struct bfd_elf_version_deps *deps; | |
791 | /* Index of the version name. This is used within BFD. */ | |
792 | unsigned int name_indx; | |
793 | /* Whether this version tree was used. This is used within BFD. */ | |
794 | int used; | |
108ba305 JJ |
795 | /* Matching hook. */ |
796 | struct bfd_elf_version_expr *(*match) | |
797 | (struct bfd_elf_version_expr_head *head, | |
798 | struct bfd_elf_version_expr *prev, const char *sym); | |
252b5132 RH |
799 | }; |
800 | ||
55255dae L |
801 | struct bfd_elf_dynamic_list |
802 | { | |
803 | struct bfd_elf_version_expr_head head; | |
804 | struct bfd_elf_version_expr *(*match) | |
805 | (struct bfd_elf_version_expr_head *head, | |
806 | struct bfd_elf_version_expr *prev, const char *sym); | |
807 | }; | |
808 | ||
252b5132 | 809 | #endif |