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, |
49fa1e15 | 3 | 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. |
252b5132 RH |
4 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
5 | ||
e0076ab3 | 6 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 7 | |
e0076ab3 NC |
8 | This program is free software; you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
a208b53c | 10 | the Free Software Foundation; either version 3 of the License, or |
e0076ab3 | 11 | (at your option) any later version. |
252b5132 | 12 | |
e0076ab3 NC |
13 | This program is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
252b5132 | 17 | |
e0076ab3 NC |
18 | You should have received a copy of the GNU General Public License |
19 | along with this program; if not, write to the Free Software | |
a208b53c NC |
20 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
21 | MA 02110-1301, USA. */ | |
252b5132 RH |
22 | |
23 | #ifndef BFDLINK_H | |
24 | #define BFDLINK_H | |
25 | ||
26 | /* Which symbols to strip during a link. */ | |
27 | enum bfd_link_strip | |
28 | { | |
29 | strip_none, /* Don't strip any symbols. */ | |
30 | strip_debugger, /* Strip debugging symbols. */ | |
31 | strip_some, /* keep_hash is the list of symbols to keep. */ | |
32 | strip_all /* Strip all symbols. */ | |
33 | }; | |
34 | ||
35 | /* Which local symbols to discard during a link. This is irrelevant | |
36 | if strip_all is used. */ | |
37 | enum bfd_link_discard | |
38 | { | |
f5fa8ca2 JJ |
39 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
40 | sections. */ | |
252b5132 RH |
41 | discard_none, /* Don't discard any locals. */ |
42 | discard_l, /* Discard local temporary symbols. */ | |
43 | discard_all /* Discard all locals. */ | |
44 | }; | |
8ea2e4bd NC |
45 | |
46 | /* Describes the type of hash table entry structure being used. | |
47 | Different hash table structure have different fields and so | |
48 | support different linking features. */ | |
49 | enum bfd_link_hash_table_type | |
50 | { | |
51 | bfd_link_generic_hash_table, | |
52 | bfd_link_elf_hash_table | |
53 | }; | |
252b5132 RH |
54 | \f |
55 | /* These are the possible types of an entry in the BFD link hash | |
56 | table. */ | |
57 | ||
58 | enum bfd_link_hash_type | |
59 | { | |
60 | bfd_link_hash_new, /* Symbol is new. */ | |
61 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ | |
62 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ | |
63 | bfd_link_hash_defined, /* Symbol is defined. */ | |
64 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ | |
65 | bfd_link_hash_common, /* Symbol is common. */ | |
66 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ | |
67 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ | |
68 | }; | |
69 | ||
f7c33884 NC |
70 | enum bfd_link_common_skip_ar_aymbols |
71 | { | |
72 | bfd_link_common_skip_none, | |
73 | bfd_link_common_skip_text, | |
74 | bfd_link_common_skip_data, | |
75 | bfd_link_common_skip_all | |
76 | }; | |
77 | ||
252b5132 RH |
78 | /* The linking routines use a hash table which uses this structure for |
79 | its elements. */ | |
80 | ||
81 | struct bfd_link_hash_entry | |
82 | { | |
83 | /* Base hash table entry structure. */ | |
84 | struct bfd_hash_entry root; | |
6ad841a1 | 85 | |
252b5132 RH |
86 | /* Type of this entry. */ |
87 | enum bfd_link_hash_type type; | |
88 | ||
252b5132 RH |
89 | /* A union of information depending upon the type. */ |
90 | union | |
91 | { | |
92 | /* Nothing is kept for bfd_hash_new. */ | |
93 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ | |
94 | struct | |
95 | { | |
f6e332e6 AM |
96 | /* Undefined and common symbols are kept in a linked list through |
97 | this field. This field is present in all of the union element | |
98 | so that we don't need to remove entries from the list when we | |
99 | change their type. Removing entries would either require the | |
100 | list to be doubly linked, which would waste more memory, or | |
101 | require a traversal. When an undefined or common symbol is | |
102 | created, it should be added to this list, the head of which is in | |
103 | the link hash table itself. As symbols are defined, they need | |
104 | not be removed from the list; anything which reads the list must | |
105 | doublecheck the symbol type. | |
106 | ||
107 | Weak symbols are not kept on this list. | |
108 | ||
109 | Defined and defweak symbols use this field as a reference marker. | |
110 | If the field is not NULL, or this structure is the tail of the | |
111 | undefined symbol list, the symbol has been referenced. If the | |
112 | symbol is undefined and becomes defined, this field will | |
113 | automatically be non-NULL since the symbol will have been on the | |
114 | undefined symbol list. */ | |
115 | struct bfd_link_hash_entry *next; | |
252b5132 | 116 | bfd *abfd; /* BFD symbol was found in. */ |
11f25ea6 | 117 | bfd *weak; /* BFD weak symbol was found in. */ |
252b5132 RH |
118 | } undef; |
119 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ | |
120 | struct | |
121 | { | |
f6e332e6 | 122 | struct bfd_link_hash_entry *next; |
252b5132 | 123 | asection *section; /* Symbol section. */ |
f6e332e6 | 124 | bfd_vma value; /* Symbol value. */ |
252b5132 RH |
125 | } def; |
126 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ | |
127 | struct | |
128 | { | |
f6e332e6 | 129 | struct bfd_link_hash_entry *next; |
252b5132 RH |
130 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
131 | const char *warning; /* Warning (bfd_link_hash_warning only). */ | |
132 | } i; | |
133 | /* bfd_link_hash_common. */ | |
134 | struct | |
135 | { | |
f6e332e6 | 136 | struct bfd_link_hash_entry *next; |
252b5132 | 137 | /* The linker needs to know three things about common |
b34976b6 AM |
138 | symbols: the size, the alignment, and the section in |
139 | which the symbol should be placed. We store the size | |
140 | here, and we allocate a small structure to hold the | |
141 | section and the alignment. The alignment is stored as a | |
142 | power of two. We don't store all the information | |
143 | directly because we don't want to increase the size of | |
144 | the union; this structure is a major space user in the | |
145 | linker. */ | |
252b5132 RH |
146 | struct bfd_link_hash_common_entry |
147 | { | |
148 | unsigned int alignment_power; /* Alignment. */ | |
149 | asection *section; /* Symbol section. */ | |
150 | } *p; | |
f6e332e6 | 151 | bfd_size_type size; /* Common symbol size. */ |
252b5132 RH |
152 | } c; |
153 | } u; | |
154 | }; | |
155 | ||
156 | /* This is the link hash table. It is a derived class of | |
157 | bfd_hash_table. */ | |
158 | ||
159 | struct bfd_link_hash_table | |
160 | { | |
161 | /* The hash table itself. */ | |
162 | struct bfd_hash_table table; | |
163 | /* The back end which created this hash table. This indicates the | |
164 | type of the entries in the hash table, which is sometimes | |
165 | important information when linking object files of different | |
166 | types together. */ | |
167 | const bfd_target *creator; | |
168 | /* A linked list of undefined and common symbols, linked through the | |
169 | next field in the bfd_link_hash_entry structure. */ | |
170 | struct bfd_link_hash_entry *undefs; | |
171 | /* Entries are added to the tail of the undefs list. */ | |
172 | struct bfd_link_hash_entry *undefs_tail; | |
b9b171fb | 173 | /* The type of the link hash table. */ |
8ea2e4bd | 174 | enum bfd_link_hash_table_type type; |
252b5132 RH |
175 | }; |
176 | ||
b34976b6 | 177 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
252b5132 RH |
178 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
179 | the real symbol. */ | |
180 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup | |
8cf3f354 AM |
181 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
182 | bfd_boolean copy, bfd_boolean follow); | |
252b5132 RH |
183 | |
184 | /* Look up an entry in the main linker hash table if the symbol might | |
185 | be wrapped. This should only be used for references to an | |
186 | undefined symbol, not for definitions of a symbol. */ | |
187 | ||
188 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup | |
8cf3f354 AM |
189 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
190 | bfd_boolean, bfd_boolean); | |
252b5132 RH |
191 | |
192 | /* Traverse a link hash table. */ | |
193 | extern void bfd_link_hash_traverse | |
8cf3f354 AM |
194 | (struct bfd_link_hash_table *, |
195 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), | |
196 | void *); | |
252b5132 RH |
197 | |
198 | /* Add an entry to the undefs list. */ | |
199 | extern void bfd_link_add_undef | |
8cf3f354 | 200 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
7815cf4f | 201 | |
77cfaee6 AM |
202 | /* Remove symbols from the undefs list that don't belong there. */ |
203 | extern void bfd_link_repair_undef_list | |
204 | (struct bfd_link_hash_table *table); | |
205 | ||
7815cf4f AM |
206 | struct bfd_sym_chain |
207 | { | |
208 | struct bfd_sym_chain *next; | |
209 | const char *name; | |
210 | }; | |
252b5132 | 211 | \f |
560e09e9 NC |
212 | /* How to handle unresolved symbols. |
213 | There are four possibilities which are enumerated below: */ | |
214 | enum report_method | |
215 | { | |
216 | /* This is the initial value when then link_info structure is created. | |
217 | It allows the various stages of the linker to determine whether they | |
218 | allowed to set the value. */ | |
219 | RM_NOT_YET_SET = 0, | |
220 | RM_IGNORE, | |
221 | RM_GENERATE_WARNING, | |
222 | RM_GENERATE_ERROR | |
223 | }; | |
224 | ||
55255dae L |
225 | struct bfd_elf_dynamic_list; |
226 | ||
252b5132 RH |
227 | /* This structure holds all the information needed to communicate |
228 | between BFD and the linker when doing a link. */ | |
229 | ||
230 | struct bfd_link_info | |
231 | { | |
cddd0089 | 232 | /* TRUE if BFD should generate a relocatable object file. */ |
1049f94e | 233 | unsigned int relocatable: 1; |
7815cf4f | 234 | |
b34976b6 | 235 | /* TRUE if BFD should generate relocation information in the final |
7815cf4f | 236 | executable. */ |
cddd0089 | 237 | unsigned int emitrelocations: 1; |
7815cf4f | 238 | |
b34976b6 | 239 | /* TRUE if BFD should generate a "task linked" object file, |
7815cf4f AM |
240 | similar to relocatable but also with globals converted to |
241 | statics. */ | |
cddd0089 | 242 | unsigned int task_link: 1; |
7815cf4f | 243 | |
b34976b6 | 244 | /* TRUE if BFD should generate a shared object. */ |
cddd0089 | 245 | unsigned int shared: 1; |
7815cf4f | 246 | |
b34976b6 | 247 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
cddd0089 | 248 | unsigned int symbolic: 1; |
7815cf4f | 249 | |
b34976b6 | 250 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
7be4069c | 251 | of an executable, rather than only those used. */ |
cddd0089 | 252 | unsigned int export_dynamic: 1; |
7815cf4f | 253 | |
b34976b6 | 254 | /* TRUE if shared objects should be linked directly, not shared. */ |
cddd0089 | 255 | unsigned int static_link: 1; |
7815cf4f | 256 | |
b34976b6 | 257 | /* TRUE if the output file should be in a traditional format. This |
252b5132 RH |
258 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
259 | on the output file, but may be checked when reading the input | |
260 | files. */ | |
cddd0089 | 261 | unsigned int traditional_format: 1; |
7815cf4f | 262 | |
b34976b6 | 263 | /* TRUE if we want to produced optimized output files. This might |
252b5132 | 264 | need much more time and therefore must be explicitly selected. */ |
cddd0089 | 265 | unsigned int optimize: 1; |
7815cf4f | 266 | |
b34976b6 | 267 | /* TRUE if ok to have multiple definition. */ |
cddd0089 | 268 | unsigned int allow_multiple_definition: 1; |
7815cf4f | 269 | |
b34976b6 | 270 | /* TRUE if ok to have version with no definition. */ |
cddd0089 AM |
271 | unsigned int allow_undefined_version: 1; |
272 | ||
fc0e6df6 PB |
273 | /* TRUE if a default symbol version should be created and used for |
274 | exported symbols. */ | |
3e3b46e5 PB |
275 | unsigned int create_default_symver: 1; |
276 | ||
fc0e6df6 PB |
277 | /* TRUE if a default symbol version should be created and used for |
278 | imported symbols. */ | |
279 | unsigned int default_imported_symver: 1; | |
280 | ||
cddd0089 AM |
281 | /* TRUE if symbols should be retained in memory, FALSE if they |
282 | should be freed and reread. */ | |
283 | unsigned int keep_memory: 1; | |
284 | ||
285 | /* TRUE if every symbol should be reported back via the notice | |
286 | callback. */ | |
287 | unsigned int notice_all: 1; | |
288 | ||
289 | /* TRUE if executable should not contain copy relocs. | |
290 | Setting this true may result in a non-sharable text segment. */ | |
291 | unsigned int nocopyreloc: 1; | |
292 | ||
293 | /* TRUE if the new ELF dynamic tags are enabled. */ | |
294 | unsigned int new_dtags: 1; | |
295 | ||
296 | /* TRUE if non-PLT relocs should be merged into one reloc section | |
297 | and sorted so that relocs against the same symbol come together. */ | |
298 | unsigned int combreloc: 1; | |
299 | ||
300 | /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment | |
301 | should be created. */ | |
302 | unsigned int eh_frame_hdr: 1; | |
31941635 | 303 | |
c6b64018 AM |
304 | /* TRUE if global symbols in discarded sections should be stripped. */ |
305 | unsigned int strip_discarded: 1; | |
306 | ||
36af4a4e JJ |
307 | /* TRUE if generating a position independent executable. */ |
308 | unsigned int pie: 1; | |
309 | ||
310 | /* TRUE if generating an executable, position independent or not. */ | |
311 | unsigned int executable : 1; | |
312 | ||
9ee5e499 JJ |
313 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
314 | flags. */ | |
315 | unsigned int execstack: 1; | |
316 | ||
317 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W | |
318 | flags. */ | |
319 | unsigned int noexecstack: 1; | |
320 | ||
8c37241b JJ |
321 | /* TRUE if PT_GNU_RELRO segment should be created. */ |
322 | unsigned int relro: 1; | |
323 | ||
8fdd7217 NC |
324 | /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
325 | unsigned int warn_shared_textrel: 1; | |
326 | ||
57316bff L |
327 | /* TRUE if unreferenced sections should be removed. */ |
328 | unsigned int gc_sections: 1; | |
329 | ||
c17d87de NC |
330 | /* TRUE if user shoudl be informed of removed unreferenced sections. */ |
331 | unsigned int print_gc_sections: 1; | |
332 | ||
fdc90cb4 JJ |
333 | /* TRUE if .hash section should be created. */ |
334 | unsigned int emit_hash: 1; | |
335 | ||
336 | /* TRUE if .gnu.hash section should be created. */ | |
337 | unsigned int emit_gnu_hash: 1; | |
338 | ||
c0f00686 L |
339 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
340 | cause map file generation to use an O(N^2) algorithm and disable | |
341 | caching ELF symbol buffer. */ | |
342 | unsigned int reduce_memory_overheads: 1; | |
343 | ||
40b36307 L |
344 | /* TRUE if all data symbols should be dynamic. */ |
345 | unsigned int dynamic_data: 1; | |
346 | ||
347 | /* TRUE if some symbols have to be dynamic, controlled by | |
348 | --dynamic-list command line options. */ | |
349 | unsigned int dynamic: 1; | |
350 | ||
ab24bc21 RM |
351 | /* Non-NULL if .note.gnu.build-id section should be created. */ |
352 | char *emit_note_gnu_build_id; | |
353 | ||
560e09e9 | 354 | /* What to do with unresolved symbols in an object file. |
59c2e50f L |
355 | When producing executables the default is GENERATE_ERROR. |
356 | When producing shared libraries the default is IGNORE. The | |
357 | assumption with shared libraries is that the reference will be | |
560e09e9 NC |
358 | resolved at load/execution time. */ |
359 | enum report_method unresolved_syms_in_objects; | |
360 | ||
361 | /* What to do with unresolved symbols in a shared library. | |
362 | The same defaults apply. */ | |
363 | enum report_method unresolved_syms_in_shared_libs; | |
364 | ||
252b5132 RH |
365 | /* Which symbols to strip. */ |
366 | enum bfd_link_strip strip; | |
7815cf4f | 367 | |
252b5132 RH |
368 | /* Which local symbols to discard. */ |
369 | enum bfd_link_discard discard; | |
7815cf4f | 370 | |
cddd0089 AM |
371 | /* Criteria for skipping symbols when detemining |
372 | whether to include an object from an archive. */ | |
373 | enum bfd_link_common_skip_ar_aymbols common_skip_ar_aymbols; | |
7815cf4f | 374 | |
b9cf773d AM |
375 | /* Char that may appear as the first char of a symbol, but should be |
376 | skipped (like symbol_leading_char) when looking up symbols in | |
377 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ | |
378 | char wrap_char; | |
379 | ||
cddd0089 AM |
380 | /* Function callbacks. */ |
381 | const struct bfd_link_callbacks *callbacks; | |
7815cf4f | 382 | |
252b5132 RH |
383 | /* Hash table handled by BFD. */ |
384 | struct bfd_link_hash_table *hash; | |
7815cf4f | 385 | |
252b5132 RH |
386 | /* Hash table of symbols to keep. This is NULL unless strip is |
387 | strip_some. */ | |
388 | struct bfd_hash_table *keep_hash; | |
7815cf4f | 389 | |
252b5132 | 390 | /* Hash table of symbols to report back via the notice callback. If |
b34976b6 | 391 | this is NULL, and notice_all is FALSE, then no symbols are |
252b5132 RH |
392 | reported back. */ |
393 | struct bfd_hash_table *notice_hash; | |
7815cf4f | 394 | |
252b5132 RH |
395 | /* Hash table of symbols which are being wrapped (the --wrap linker |
396 | option). If this is NULL, no symbols are being wrapped. */ | |
397 | struct bfd_hash_table *wrap_hash; | |
7815cf4f | 398 | |
cddd0089 AM |
399 | /* The list of input BFD's involved in the link. These are chained |
400 | together via the link_next field. */ | |
401 | bfd *input_bfds; | |
a9a4c53e | 402 | bfd **input_bfds_tail; |
cddd0089 AM |
403 | |
404 | /* If a symbol should be created for each input BFD, this is section | |
405 | where those symbols should be placed. It must be a section in | |
406 | the output BFD. It may be NULL, in which case no such symbols | |
407 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
408 | linker command language. */ | |
409 | asection *create_object_symbols_section; | |
410 | ||
411 | /* List of global symbol names that are starting points for marking | |
412 | sections against garbage collection. */ | |
413 | struct bfd_sym_chain *gc_sym_list; | |
414 | ||
252b5132 | 415 | /* If a base output file is wanted, then this points to it */ |
8cf3f354 | 416 | void *base_file; |
252b5132 | 417 | |
94883c63 MM |
418 | /* The function to call when the executable or shared object is |
419 | loaded. */ | |
420 | const char *init_function; | |
7815cf4f | 421 | |
94883c63 MM |
422 | /* The function to call when the executable or shared object is |
423 | unloaded. */ | |
424 | const char *fini_function; | |
9bfcb6d6 | 425 | |
fbbc3759 L |
426 | /* Number of relaxation passes. Usually only one relaxation pass |
427 | is needed. But a backend can have as many relaxation passes as | |
428 | necessary. During bfd_relax_section call, it is set to the | |
429 | current pass, starting from 0. */ | |
430 | int relax_pass; | |
431 | ||
4a828aab RH |
432 | /* Number of relaxation trips. This number is incremented every |
433 | time the relaxation pass is restarted due to a previous | |
434 | relaxation returning true in *AGAIN. */ | |
435 | int relax_trip; | |
436 | ||
b34976b6 | 437 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
e0076ab3 NC |
438 | should be generated/linked against. Set to 1 if this feature |
439 | is explicitly requested by the user, -1 if enabled by default. */ | |
440 | int pei386_auto_import; | |
db6751f2 | 441 | |
2fa9fc65 NC |
442 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
443 | in pei386 DLLs should be generated. Set to 1 if this feature | |
444 | is explicitly requested by the user, -1 if enabled by default. */ | |
445 | int pei386_runtime_pseudo_reloc; | |
446 | ||
db6751f2 | 447 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 448 | unsigned int spare_dynamic_tags; |
f7c33884 | 449 | |
cddd0089 AM |
450 | /* May be used to set DT_FLAGS for ELF. */ |
451 | bfd_vma flags; | |
452 | ||
453 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
454 | bfd_vma flags_1; | |
8c37241b JJ |
455 | |
456 | /* Start and end of RELRO region. */ | |
457 | bfd_vma relro_start, relro_end; | |
55255dae L |
458 | |
459 | /* List of symbols should be dynamic. */ | |
40b36307 | 460 | struct bfd_elf_dynamic_list *dynamic_list; |
252b5132 RH |
461 | }; |
462 | ||
49fa1e15 AM |
463 | /* This structures holds a set of callback functions. These are called |
464 | by the BFD linker routines. Except for the info functions, the first | |
e1fffbe6 AM |
465 | argument to each callback function is the bfd_link_info structure |
466 | being used and each function returns a boolean value. If the | |
467 | function returns FALSE, then the BFD function which called it should | |
468 | return with a failure indication. */ | |
252b5132 RH |
469 | |
470 | struct bfd_link_callbacks | |
471 | { | |
472 | /* A function which is called when an object is added from an | |
473 | archive. ABFD is the archive element being added. NAME is the | |
474 | name of the symbol which caused the archive element to be pulled | |
475 | in. */ | |
b34976b6 | 476 | bfd_boolean (*add_archive_element) |
8cf3f354 | 477 | (struct bfd_link_info *, bfd *abfd, const char *name); |
252b5132 RH |
478 | /* A function which is called when a symbol is found with multiple |
479 | definitions. NAME is the symbol which is defined multiple times. | |
480 | OBFD is the old BFD, OSEC is the old section, OVAL is the old | |
481 | value, NBFD is the new BFD, NSEC is the new section, and NVAL is | |
482 | the new value. OBFD may be NULL. OSEC and NSEC may be | |
483 | bfd_com_section or bfd_ind_section. */ | |
b34976b6 | 484 | bfd_boolean (*multiple_definition) |
8cf3f354 AM |
485 | (struct bfd_link_info *, const char *name, |
486 | bfd *obfd, asection *osec, bfd_vma oval, | |
487 | bfd *nbfd, asection *nsec, bfd_vma nval); | |
252b5132 RH |
488 | /* A function which is called when a common symbol is defined |
489 | multiple times. NAME is the symbol appearing multiple times. | |
490 | OBFD is the BFD of the existing symbol; it may be NULL if this is | |
491 | not known. OTYPE is the type of the existing symbol, which may | |
492 | be bfd_link_hash_defined, bfd_link_hash_defweak, | |
493 | bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is | |
494 | bfd_link_hash_common, OSIZE is the size of the existing symbol. | |
495 | NBFD is the BFD of the new symbol. NTYPE is the type of the new | |
496 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
497 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
498 | is the size of the new symbol. */ | |
b34976b6 | 499 | bfd_boolean (*multiple_common) |
8cf3f354 AM |
500 | (struct bfd_link_info *, const char *name, |
501 | bfd *obfd, enum bfd_link_hash_type otype, bfd_vma osize, | |
502 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); | |
252b5132 RH |
503 | /* A function which is called to add a symbol to a set. ENTRY is |
504 | the link hash table entry for the set itself (e.g., | |
505 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
1049f94e | 506 | the set when generating a relocatable file, and is also used to |
252b5132 RH |
507 | get the size of the entry when generating an executable file. |
508 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
b34976b6 | 509 | bfd_boolean (*add_to_set) |
8cf3f354 AM |
510 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
511 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
512 | /* A function which is called when the name of a g++ constructor or |
513 | destructor is found. This is only called by some object file | |
b34976b6 | 514 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
252b5132 | 515 | destructor. This will use BFD_RELOC_CTOR when generating a |
1049f94e | 516 | relocatable file. NAME is the name of the symbol found. ABFD, |
252b5132 | 517 | SECTION and VALUE are the value of the symbol. */ |
b34976b6 | 518 | bfd_boolean (*constructor) |
8cf3f354 AM |
519 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
520 | bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
521 | /* A function which is called to issue a linker warning. For |
522 | example, this is called when there is a reference to a warning | |
523 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
524 | of the symbol which triggered the warning; it may be NULL if | |
525 | there is none. ABFD, SECTION and ADDRESS identify the location | |
526 | which trigerred the warning; either ABFD or SECTION or both may | |
527 | be NULL if the location is not known. */ | |
b34976b6 | 528 | bfd_boolean (*warning) |
8cf3f354 AM |
529 | (struct bfd_link_info *, const char *warning, const char *symbol, |
530 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
531 | /* A function which is called when a relocation is attempted against |
532 | an undefined symbol. NAME is the symbol which is undefined. | |
533 | ABFD, SECTION and ADDRESS identify the location from which the | |
c086cbc6 L |
534 | reference is made. FATAL indicates whether an undefined symbol is |
535 | a fatal error or not. In some cases SECTION may be NULL. */ | |
b34976b6 | 536 | bfd_boolean (*undefined_symbol) |
8cf3f354 AM |
537 | (struct bfd_link_info *, const char *name, bfd *abfd, |
538 | asection *section, bfd_vma address, bfd_boolean fatal); | |
dfeffb9f L |
539 | /* A function which is called when a reloc overflow occurs. ENTRY is |
540 | the link hash table entry for the symbol the reloc is against. | |
541 | NAME is the name of the local symbol or section the reloc is | |
542 | against, RELOC_NAME is the name of the relocation, and ADDEND is | |
543 | any addend that is used. ABFD, SECTION and ADDRESS identify the | |
252b5132 RH |
544 | location at which the overflow occurs; if this is the result of a |
545 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
546 | ABFD will be NULL. */ | |
b34976b6 | 547 | bfd_boolean (*reloc_overflow) |
dfeffb9f L |
548 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
549 | const char *name, const char *reloc_name, bfd_vma addend, | |
550 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 551 | /* A function which is called when a dangerous reloc is performed. |
c17ae8a2 | 552 | MESSAGE is an appropriate message. |
252b5132 RH |
553 | ABFD, SECTION and ADDRESS identify the location at which the |
554 | problem occurred; if this is the result of a | |
555 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
556 | ABFD will be NULL. */ | |
b34976b6 | 557 | bfd_boolean (*reloc_dangerous) |
8cf3f354 AM |
558 | (struct bfd_link_info *, const char *message, |
559 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
560 | /* A function which is called when a reloc is found to be attached |
561 | to a symbol which is not being written out. NAME is the name of | |
562 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
563 | the reloc; if this is the result of a | |
564 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
565 | ABFD will be NULL. */ | |
b34976b6 | 566 | bfd_boolean (*unattached_reloc) |
8cf3f354 AM |
567 | (struct bfd_link_info *, const char *name, |
568 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
569 | /* A function which is called when a symbol in notice_hash is |
570 | defined or referenced. NAME is the symbol. ABFD, SECTION and | |
571 | ADDRESS are the value of the symbol. If SECTION is | |
572 | bfd_und_section, this is a reference. */ | |
b34976b6 | 573 | bfd_boolean (*notice) |
8cf3f354 AM |
574 | (struct bfd_link_info *, const char *name, |
575 | bfd *abfd, asection *section, bfd_vma address); | |
49fa1e15 | 576 | /* Error or warning link info message. */ |
e1fffbe6 AM |
577 | void (*einfo) |
578 | (const char *fmt, ...); | |
49fa1e15 AM |
579 | /* General link info message. */ |
580 | void (*info) | |
581 | (const char *fmt, ...); | |
582 | /* Message to be printed in linker map file. */ | |
583 | void (*minfo) | |
584 | (const char *fmt, ...); | |
2889e75b NC |
585 | /* This callback provides a chance for users of the BFD library to |
586 | override its decision about whether to place two adjacent sections | |
587 | into the same segment. */ | |
588 | bfd_boolean (*override_segment_assignment) | |
589 | (struct bfd_link_info *, bfd * abfd, | |
590 | asection * current_section, asection * previous_section, | |
591 | bfd_boolean new_segment); | |
252b5132 RH |
592 | }; |
593 | \f | |
594 | /* The linker builds link_order structures which tell the code how to | |
595 | include input data in the output file. */ | |
596 | ||
597 | /* These are the types of link_order structures. */ | |
598 | ||
599 | enum bfd_link_order_type | |
600 | { | |
601 | bfd_undefined_link_order, /* Undefined. */ | |
602 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
603 | bfd_data_link_order, /* Set to explicit data. */ |
604 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
605 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
606 | }; | |
607 | ||
608 | /* This is the link_order structure itself. These form a chain | |
6ed89c00 | 609 | attached to the output section whose contents they are describing. */ |
252b5132 | 610 | |
b34976b6 | 611 | struct bfd_link_order |
252b5132 RH |
612 | { |
613 | /* Next link_order in chain. */ | |
614 | struct bfd_link_order *next; | |
615 | /* Type of link_order. */ | |
616 | enum bfd_link_order_type type; | |
617 | /* Offset within output section. */ | |
b34976b6 | 618 | bfd_vma offset; |
252b5132 RH |
619 | /* Size within output section. */ |
620 | bfd_size_type size; | |
621 | /* Type specific information. */ | |
b34976b6 | 622 | union |
252b5132 | 623 | { |
b34976b6 | 624 | struct |
252b5132 RH |
625 | { |
626 | /* Section to include. If this is used, then | |
627 | section->output_section must be the section the | |
628 | link_order is attached to, section->output_offset must | |
eea6121a | 629 | equal the link_order offset field, and section->size |
252b5132 RH |
630 | must equal the link_order size field. Maybe these |
631 | restrictions should be relaxed someday. */ | |
632 | asection *section; | |
633 | } indirect; | |
634 | struct | |
635 | { | |
9a1b9f82 AM |
636 | /* Size of contents, or zero when contents size == size |
637 | within output section. | |
638 | A non-zero value allows filling of the output section | |
639 | with an arbitrary repeated pattern. */ | |
640 | unsigned int size; | |
641 | /* Data to put into file. */ | |
252b5132 RH |
642 | bfd_byte *contents; |
643 | } data; | |
644 | struct | |
645 | { | |
646 | /* Description of reloc to generate. Used for | |
647 | bfd_section_reloc_link_order and | |
648 | bfd_symbol_reloc_link_order. */ | |
649 | struct bfd_link_order_reloc *p; | |
650 | } reloc; | |
651 | } u; | |
652 | }; | |
653 | ||
654 | /* A linker order of type bfd_section_reloc_link_order or | |
655 | bfd_symbol_reloc_link_order means to create a reloc against a | |
656 | section or symbol, respectively. This is used to implement -Ur to | |
657 | generate relocs for the constructor tables. The | |
658 | bfd_link_order_reloc structure describes the reloc that BFD should | |
659 | create. It is similar to a arelent, but I didn't use arelent | |
660 | because the linker does not know anything about most symbols, and | |
661 | any asymbol structure it creates will be partially meaningless. | |
662 | This information could logically be in the bfd_link_order struct, | |
663 | but I didn't want to waste the space since these types of relocs | |
664 | are relatively rare. */ | |
665 | ||
666 | struct bfd_link_order_reloc | |
667 | { | |
668 | /* Reloc type. */ | |
669 | bfd_reloc_code_real_type reloc; | |
670 | ||
671 | union | |
672 | { | |
673 | /* For type bfd_section_reloc_link_order, this is the section | |
674 | the reloc should be against. This must be a section in the | |
675 | output BFD, not any of the input BFDs. */ | |
676 | asection *section; | |
677 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
678 | symbol the reloc should be against. */ | |
679 | const char *name; | |
680 | } u; | |
681 | ||
682 | /* Addend to use. The object file should contain zero. The BFD | |
683 | backend is responsible for filling in the contents of the object | |
684 | file correctly. For some object file formats (e.g., COFF) the | |
685 | addend must be stored into in the object file, and for some | |
686 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
687 | bfd_vma addend; | |
688 | }; | |
689 | ||
690 | /* Allocate a new link_order for a section. */ | |
8cf3f354 | 691 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
252b5132 RH |
692 | |
693 | /* These structures are used to describe version information for the | |
694 | ELF linker. These structures could be manipulated entirely inside | |
695 | BFD, but it would be a pain. Instead, the regular linker sets up | |
696 | these structures, and then passes them into BFD. */ | |
697 | ||
108ba305 | 698 | /* Glob pattern for a version. */ |
252b5132 RH |
699 | |
700 | struct bfd_elf_version_expr | |
701 | { | |
108ba305 | 702 | /* Next glob pattern for this version. */ |
252b5132 | 703 | struct bfd_elf_version_expr *next; |
108ba305 | 704 | /* Glob pattern. */ |
252b5132 | 705 | const char *pattern; |
5e35cbc2 L |
706 | /* NULL for a glob pattern, otherwise a straight symbol. */ |
707 | const char *symbol; | |
31941635 | 708 | /* Defined by ".symver". */ |
108ba305 | 709 | unsigned int symver : 1; |
31941635 L |
710 | /* Defined by version script. */ |
711 | unsigned int script : 1; | |
108ba305 JJ |
712 | /* Pattern type. */ |
713 | #define BFD_ELF_VERSION_C_TYPE 1 | |
714 | #define BFD_ELF_VERSION_CXX_TYPE 2 | |
715 | #define BFD_ELF_VERSION_JAVA_TYPE 4 | |
716 | unsigned int mask : 3; | |
717 | }; | |
718 | ||
719 | struct bfd_elf_version_expr_head | |
720 | { | |
721 | /* List of all patterns, both wildcards and non-wildcards. */ | |
722 | struct bfd_elf_version_expr *list; | |
723 | /* Hash table for non-wildcards. */ | |
724 | void *htab; | |
725 | /* Remaining patterns. */ | |
726 | struct bfd_elf_version_expr *remaining; | |
727 | /* What kind of pattern types are present in list (bitmask). */ | |
728 | unsigned int mask; | |
252b5132 RH |
729 | }; |
730 | ||
731 | /* Version dependencies. */ | |
732 | ||
733 | struct bfd_elf_version_deps | |
734 | { | |
735 | /* Next dependency for this version. */ | |
736 | struct bfd_elf_version_deps *next; | |
737 | /* The version which this version depends upon. */ | |
738 | struct bfd_elf_version_tree *version_needed; | |
739 | }; | |
740 | ||
741 | /* A node in the version tree. */ | |
742 | ||
743 | struct bfd_elf_version_tree | |
744 | { | |
745 | /* Next version. */ | |
746 | struct bfd_elf_version_tree *next; | |
747 | /* Name of this version. */ | |
748 | const char *name; | |
749 | /* Version number. */ | |
750 | unsigned int vernum; | |
751 | /* Regular expressions for global symbols in this version. */ | |
108ba305 | 752 | struct bfd_elf_version_expr_head globals; |
252b5132 | 753 | /* Regular expressions for local symbols in this version. */ |
108ba305 | 754 | struct bfd_elf_version_expr_head locals; |
252b5132 RH |
755 | /* List of versions which this version depends upon. */ |
756 | struct bfd_elf_version_deps *deps; | |
757 | /* Index of the version name. This is used within BFD. */ | |
758 | unsigned int name_indx; | |
759 | /* Whether this version tree was used. This is used within BFD. */ | |
760 | int used; | |
108ba305 JJ |
761 | /* Matching hook. */ |
762 | struct bfd_elf_version_expr *(*match) | |
763 | (struct bfd_elf_version_expr_head *head, | |
764 | struct bfd_elf_version_expr *prev, const char *sym); | |
252b5132 RH |
765 | }; |
766 | ||
55255dae L |
767 | struct bfd_elf_dynamic_list |
768 | { | |
769 | struct bfd_elf_version_expr_head head; | |
770 | struct bfd_elf_version_expr *(*match) | |
771 | (struct bfd_elf_version_expr_head *head, | |
772 | struct bfd_elf_version_expr *prev, const char *sym); | |
773 | }; | |
774 | ||
252b5132 | 775 | #endif |