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, |
f13a99db | 3 | 2003, 2004, 2005, 2006, 2007, 2008 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; | |
252b5132 RH |
163 | /* A linked list of undefined and common symbols, linked through the |
164 | next field in the bfd_link_hash_entry structure. */ | |
165 | struct bfd_link_hash_entry *undefs; | |
166 | /* Entries are added to the tail of the undefs list. */ | |
167 | struct bfd_link_hash_entry *undefs_tail; | |
b9b171fb | 168 | /* The type of the link hash table. */ |
8ea2e4bd | 169 | enum bfd_link_hash_table_type type; |
252b5132 RH |
170 | }; |
171 | ||
b34976b6 | 172 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
252b5132 RH |
173 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
174 | the real symbol. */ | |
175 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup | |
8cf3f354 AM |
176 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
177 | bfd_boolean copy, bfd_boolean follow); | |
252b5132 RH |
178 | |
179 | /* Look up an entry in the main linker hash table if the symbol might | |
180 | be wrapped. This should only be used for references to an | |
181 | undefined symbol, not for definitions of a symbol. */ | |
182 | ||
183 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup | |
8cf3f354 AM |
184 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
185 | bfd_boolean, bfd_boolean); | |
252b5132 RH |
186 | |
187 | /* Traverse a link hash table. */ | |
188 | extern void bfd_link_hash_traverse | |
8cf3f354 AM |
189 | (struct bfd_link_hash_table *, |
190 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), | |
191 | void *); | |
252b5132 RH |
192 | |
193 | /* Add an entry to the undefs list. */ | |
194 | extern void bfd_link_add_undef | |
8cf3f354 | 195 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
7815cf4f | 196 | |
77cfaee6 AM |
197 | /* Remove symbols from the undefs list that don't belong there. */ |
198 | extern void bfd_link_repair_undef_list | |
199 | (struct bfd_link_hash_table *table); | |
200 | ||
7815cf4f AM |
201 | struct bfd_sym_chain |
202 | { | |
203 | struct bfd_sym_chain *next; | |
204 | const char *name; | |
205 | }; | |
252b5132 | 206 | \f |
560e09e9 NC |
207 | /* How to handle unresolved symbols. |
208 | There are four possibilities which are enumerated below: */ | |
209 | enum report_method | |
210 | { | |
211 | /* This is the initial value when then link_info structure is created. | |
212 | It allows the various stages of the linker to determine whether they | |
213 | allowed to set the value. */ | |
214 | RM_NOT_YET_SET = 0, | |
215 | RM_IGNORE, | |
216 | RM_GENERATE_WARNING, | |
217 | RM_GENERATE_ERROR | |
218 | }; | |
219 | ||
55255dae L |
220 | struct bfd_elf_dynamic_list; |
221 | ||
252b5132 RH |
222 | /* This structure holds all the information needed to communicate |
223 | between BFD and the linker when doing a link. */ | |
224 | ||
225 | struct bfd_link_info | |
226 | { | |
cddd0089 | 227 | /* TRUE if BFD should generate a relocatable object file. */ |
1049f94e | 228 | unsigned int relocatable: 1; |
7815cf4f | 229 | |
b34976b6 | 230 | /* TRUE if BFD should generate relocation information in the final |
7815cf4f | 231 | executable. */ |
cddd0089 | 232 | unsigned int emitrelocations: 1; |
7815cf4f | 233 | |
b34976b6 | 234 | /* TRUE if BFD should generate a "task linked" object file, |
7815cf4f AM |
235 | similar to relocatable but also with globals converted to |
236 | statics. */ | |
cddd0089 | 237 | unsigned int task_link: 1; |
7815cf4f | 238 | |
b34976b6 | 239 | /* TRUE if BFD should generate a shared object. */ |
cddd0089 | 240 | unsigned int shared: 1; |
7815cf4f | 241 | |
b34976b6 | 242 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
cddd0089 | 243 | unsigned int symbolic: 1; |
7815cf4f | 244 | |
b34976b6 | 245 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
7be4069c | 246 | of an executable, rather than only those used. */ |
cddd0089 | 247 | unsigned int export_dynamic: 1; |
7815cf4f | 248 | |
b34976b6 | 249 | /* TRUE if shared objects should be linked directly, not shared. */ |
cddd0089 | 250 | unsigned int static_link: 1; |
7815cf4f | 251 | |
b34976b6 | 252 | /* TRUE if the output file should be in a traditional format. This |
252b5132 RH |
253 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
254 | on the output file, but may be checked when reading the input | |
255 | files. */ | |
cddd0089 | 256 | unsigned int traditional_format: 1; |
7815cf4f | 257 | |
b34976b6 | 258 | /* TRUE if we want to produced optimized output files. This might |
252b5132 | 259 | need much more time and therefore must be explicitly selected. */ |
cddd0089 | 260 | unsigned int optimize: 1; |
7815cf4f | 261 | |
b34976b6 | 262 | /* TRUE if ok to have multiple definition. */ |
cddd0089 | 263 | unsigned int allow_multiple_definition: 1; |
7815cf4f | 264 | |
b34976b6 | 265 | /* TRUE if ok to have version with no definition. */ |
cddd0089 AM |
266 | unsigned int allow_undefined_version: 1; |
267 | ||
fc0e6df6 PB |
268 | /* TRUE if a default symbol version should be created and used for |
269 | exported symbols. */ | |
3e3b46e5 PB |
270 | unsigned int create_default_symver: 1; |
271 | ||
fc0e6df6 PB |
272 | /* TRUE if a default symbol version should be created and used for |
273 | imported symbols. */ | |
274 | unsigned int default_imported_symver: 1; | |
275 | ||
cddd0089 AM |
276 | /* TRUE if symbols should be retained in memory, FALSE if they |
277 | should be freed and reread. */ | |
278 | unsigned int keep_memory: 1; | |
279 | ||
280 | /* TRUE if every symbol should be reported back via the notice | |
281 | callback. */ | |
282 | unsigned int notice_all: 1; | |
283 | ||
284 | /* TRUE if executable should not contain copy relocs. | |
285 | Setting this true may result in a non-sharable text segment. */ | |
286 | unsigned int nocopyreloc: 1; | |
287 | ||
288 | /* TRUE if the new ELF dynamic tags are enabled. */ | |
289 | unsigned int new_dtags: 1; | |
290 | ||
291 | /* TRUE if non-PLT relocs should be merged into one reloc section | |
292 | and sorted so that relocs against the same symbol come together. */ | |
293 | unsigned int combreloc: 1; | |
294 | ||
295 | /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment | |
296 | should be created. */ | |
297 | unsigned int eh_frame_hdr: 1; | |
31941635 | 298 | |
c6b64018 AM |
299 | /* TRUE if global symbols in discarded sections should be stripped. */ |
300 | unsigned int strip_discarded: 1; | |
301 | ||
36af4a4e JJ |
302 | /* TRUE if generating a position independent executable. */ |
303 | unsigned int pie: 1; | |
304 | ||
305 | /* TRUE if generating an executable, position independent or not. */ | |
306 | unsigned int executable : 1; | |
307 | ||
9ee5e499 JJ |
308 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
309 | flags. */ | |
310 | unsigned int execstack: 1; | |
311 | ||
312 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W | |
313 | flags. */ | |
314 | unsigned int noexecstack: 1; | |
315 | ||
8c37241b JJ |
316 | /* TRUE if PT_GNU_RELRO segment should be created. */ |
317 | unsigned int relro: 1; | |
318 | ||
8fdd7217 NC |
319 | /* TRUE if we should warn when adding a DT_TEXTREL to a shared object. */ |
320 | unsigned int warn_shared_textrel: 1; | |
321 | ||
57316bff L |
322 | /* TRUE if unreferenced sections should be removed. */ |
323 | unsigned int gc_sections: 1; | |
324 | ||
c17d87de NC |
325 | /* TRUE if user shoudl be informed of removed unreferenced sections. */ |
326 | unsigned int print_gc_sections: 1; | |
327 | ||
fdc90cb4 JJ |
328 | /* TRUE if .hash section should be created. */ |
329 | unsigned int emit_hash: 1; | |
330 | ||
331 | /* TRUE if .gnu.hash section should be created. */ | |
332 | unsigned int emit_gnu_hash: 1; | |
333 | ||
c0f00686 L |
334 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
335 | cause map file generation to use an O(N^2) algorithm and disable | |
336 | caching ELF symbol buffer. */ | |
337 | unsigned int reduce_memory_overheads: 1; | |
338 | ||
40b36307 L |
339 | /* TRUE if all data symbols should be dynamic. */ |
340 | unsigned int dynamic_data: 1; | |
341 | ||
342 | /* TRUE if some symbols have to be dynamic, controlled by | |
343 | --dynamic-list command line options. */ | |
344 | unsigned int dynamic: 1; | |
345 | ||
ab24bc21 RM |
346 | /* Non-NULL if .note.gnu.build-id section should be created. */ |
347 | char *emit_note_gnu_build_id; | |
348 | ||
560e09e9 | 349 | /* What to do with unresolved symbols in an object file. |
59c2e50f L |
350 | When producing executables the default is GENERATE_ERROR. |
351 | When producing shared libraries the default is IGNORE. The | |
352 | assumption with shared libraries is that the reference will be | |
560e09e9 NC |
353 | resolved at load/execution time. */ |
354 | enum report_method unresolved_syms_in_objects; | |
355 | ||
356 | /* What to do with unresolved symbols in a shared library. | |
357 | The same defaults apply. */ | |
358 | enum report_method unresolved_syms_in_shared_libs; | |
359 | ||
252b5132 RH |
360 | /* Which symbols to strip. */ |
361 | enum bfd_link_strip strip; | |
7815cf4f | 362 | |
252b5132 RH |
363 | /* Which local symbols to discard. */ |
364 | enum bfd_link_discard discard; | |
7815cf4f | 365 | |
cddd0089 AM |
366 | /* Criteria for skipping symbols when detemining |
367 | whether to include an object from an archive. */ | |
368 | enum bfd_link_common_skip_ar_aymbols common_skip_ar_aymbols; | |
7815cf4f | 369 | |
b9cf773d AM |
370 | /* Char that may appear as the first char of a symbol, but should be |
371 | skipped (like symbol_leading_char) when looking up symbols in | |
372 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ | |
373 | char wrap_char; | |
374 | ||
97407faf AM |
375 | /* Separator between archive and filename in linker script filespecs. */ |
376 | char path_separator; | |
377 | ||
cddd0089 AM |
378 | /* Function callbacks. */ |
379 | const struct bfd_link_callbacks *callbacks; | |
7815cf4f | 380 | |
252b5132 RH |
381 | /* Hash table handled by BFD. */ |
382 | struct bfd_link_hash_table *hash; | |
7815cf4f | 383 | |
252b5132 RH |
384 | /* Hash table of symbols to keep. This is NULL unless strip is |
385 | strip_some. */ | |
386 | struct bfd_hash_table *keep_hash; | |
7815cf4f | 387 | |
252b5132 | 388 | /* Hash table of symbols to report back via the notice callback. If |
b34976b6 | 389 | this is NULL, and notice_all is FALSE, then no symbols are |
252b5132 RH |
390 | reported back. */ |
391 | struct bfd_hash_table *notice_hash; | |
7815cf4f | 392 | |
252b5132 RH |
393 | /* Hash table of symbols which are being wrapped (the --wrap linker |
394 | option). If this is NULL, no symbols are being wrapped. */ | |
395 | struct bfd_hash_table *wrap_hash; | |
7815cf4f | 396 | |
f13a99db AM |
397 | /* The output BFD. */ |
398 | bfd *output_bfd; | |
399 | ||
cddd0089 AM |
400 | /* The list of input BFD's involved in the link. These are chained |
401 | together via the link_next field. */ | |
402 | bfd *input_bfds; | |
a9a4c53e | 403 | bfd **input_bfds_tail; |
cddd0089 AM |
404 | |
405 | /* If a symbol should be created for each input BFD, this is section | |
406 | where those symbols should be placed. It must be a section in | |
407 | the output BFD. It may be NULL, in which case no such symbols | |
408 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
409 | linker command language. */ | |
410 | asection *create_object_symbols_section; | |
411 | ||
412 | /* List of global symbol names that are starting points for marking | |
413 | sections against garbage collection. */ | |
414 | struct bfd_sym_chain *gc_sym_list; | |
415 | ||
252b5132 | 416 | /* If a base output file is wanted, then this points to it */ |
8cf3f354 | 417 | void *base_file; |
252b5132 | 418 | |
94883c63 MM |
419 | /* The function to call when the executable or shared object is |
420 | loaded. */ | |
421 | const char *init_function; | |
7815cf4f | 422 | |
94883c63 MM |
423 | /* The function to call when the executable or shared object is |
424 | unloaded. */ | |
425 | const char *fini_function; | |
9bfcb6d6 | 426 | |
fbbc3759 L |
427 | /* Number of relaxation passes. Usually only one relaxation pass |
428 | is needed. But a backend can have as many relaxation passes as | |
429 | necessary. During bfd_relax_section call, it is set to the | |
430 | current pass, starting from 0. */ | |
431 | int relax_pass; | |
432 | ||
4a828aab RH |
433 | /* Number of relaxation trips. This number is incremented every |
434 | time the relaxation pass is restarted due to a previous | |
435 | relaxation returning true in *AGAIN. */ | |
436 | int relax_trip; | |
437 | ||
b34976b6 | 438 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
e0076ab3 NC |
439 | should be generated/linked against. Set to 1 if this feature |
440 | is explicitly requested by the user, -1 if enabled by default. */ | |
441 | int pei386_auto_import; | |
db6751f2 | 442 | |
2fa9fc65 NC |
443 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
444 | in pei386 DLLs should be generated. Set to 1 if this feature | |
445 | is explicitly requested by the user, -1 if enabled by default. */ | |
446 | int pei386_runtime_pseudo_reloc; | |
447 | ||
db6751f2 | 448 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 449 | unsigned int spare_dynamic_tags; |
f7c33884 | 450 | |
cddd0089 AM |
451 | /* May be used to set DT_FLAGS for ELF. */ |
452 | bfd_vma flags; | |
453 | ||
454 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
455 | bfd_vma flags_1; | |
8c37241b JJ |
456 | |
457 | /* Start and end of RELRO region. */ | |
458 | bfd_vma relro_start, relro_end; | |
55255dae L |
459 | |
460 | /* List of symbols should be dynamic. */ | |
40b36307 | 461 | struct bfd_elf_dynamic_list *dynamic_list; |
252b5132 RH |
462 | }; |
463 | ||
49fa1e15 AM |
464 | /* This structures holds a set of callback functions. These are called |
465 | by the BFD linker routines. Except for the info functions, the first | |
e1fffbe6 AM |
466 | argument to each callback function is the bfd_link_info structure |
467 | being used and each function returns a boolean value. If the | |
468 | function returns FALSE, then the BFD function which called it should | |
469 | return with a failure indication. */ | |
252b5132 RH |
470 | |
471 | struct bfd_link_callbacks | |
472 | { | |
473 | /* A function which is called when an object is added from an | |
474 | archive. ABFD is the archive element being added. NAME is the | |
475 | name of the symbol which caused the archive element to be pulled | |
476 | in. */ | |
b34976b6 | 477 | bfd_boolean (*add_archive_element) |
8cf3f354 | 478 | (struct bfd_link_info *, bfd *abfd, const char *name); |
252b5132 RH |
479 | /* A function which is called when a symbol is found with multiple |
480 | definitions. NAME is the symbol which is defined multiple times. | |
481 | OBFD is the old BFD, OSEC is the old section, OVAL is the old | |
482 | value, NBFD is the new BFD, NSEC is the new section, and NVAL is | |
483 | the new value. OBFD may be NULL. OSEC and NSEC may be | |
484 | bfd_com_section or bfd_ind_section. */ | |
b34976b6 | 485 | bfd_boolean (*multiple_definition) |
8cf3f354 AM |
486 | (struct bfd_link_info *, const char *name, |
487 | bfd *obfd, asection *osec, bfd_vma oval, | |
488 | bfd *nbfd, asection *nsec, bfd_vma nval); | |
252b5132 RH |
489 | /* A function which is called when a common symbol is defined |
490 | multiple times. NAME is the symbol appearing multiple times. | |
491 | OBFD is the BFD of the existing symbol; it may be NULL if this is | |
492 | not known. OTYPE is the type of the existing symbol, which may | |
493 | be bfd_link_hash_defined, bfd_link_hash_defweak, | |
494 | bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is | |
495 | bfd_link_hash_common, OSIZE is the size of the existing symbol. | |
496 | NBFD is the BFD of the new symbol. NTYPE is the type of the new | |
497 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
498 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
499 | is the size of the new symbol. */ | |
b34976b6 | 500 | bfd_boolean (*multiple_common) |
8cf3f354 AM |
501 | (struct bfd_link_info *, const char *name, |
502 | bfd *obfd, enum bfd_link_hash_type otype, bfd_vma osize, | |
503 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); | |
252b5132 RH |
504 | /* A function which is called to add a symbol to a set. ENTRY is |
505 | the link hash table entry for the set itself (e.g., | |
506 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
1049f94e | 507 | the set when generating a relocatable file, and is also used to |
252b5132 RH |
508 | get the size of the entry when generating an executable file. |
509 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
b34976b6 | 510 | bfd_boolean (*add_to_set) |
8cf3f354 AM |
511 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
512 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
513 | /* A function which is called when the name of a g++ constructor or |
514 | destructor is found. This is only called by some object file | |
b34976b6 | 515 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
252b5132 | 516 | destructor. This will use BFD_RELOC_CTOR when generating a |
1049f94e | 517 | relocatable file. NAME is the name of the symbol found. ABFD, |
252b5132 | 518 | SECTION and VALUE are the value of the symbol. */ |
b34976b6 | 519 | bfd_boolean (*constructor) |
8cf3f354 AM |
520 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
521 | bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
522 | /* A function which is called to issue a linker warning. For |
523 | example, this is called when there is a reference to a warning | |
524 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
525 | of the symbol which triggered the warning; it may be NULL if | |
526 | there is none. ABFD, SECTION and ADDRESS identify the location | |
527 | which trigerred the warning; either ABFD or SECTION or both may | |
528 | be NULL if the location is not known. */ | |
b34976b6 | 529 | bfd_boolean (*warning) |
8cf3f354 AM |
530 | (struct bfd_link_info *, const char *warning, const char *symbol, |
531 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
532 | /* A function which is called when a relocation is attempted against |
533 | an undefined symbol. NAME is the symbol which is undefined. | |
534 | ABFD, SECTION and ADDRESS identify the location from which the | |
c086cbc6 L |
535 | reference is made. FATAL indicates whether an undefined symbol is |
536 | a fatal error or not. In some cases SECTION may be NULL. */ | |
b34976b6 | 537 | bfd_boolean (*undefined_symbol) |
8cf3f354 AM |
538 | (struct bfd_link_info *, const char *name, bfd *abfd, |
539 | asection *section, bfd_vma address, bfd_boolean fatal); | |
dfeffb9f L |
540 | /* A function which is called when a reloc overflow occurs. ENTRY is |
541 | the link hash table entry for the symbol the reloc is against. | |
542 | NAME is the name of the local symbol or section the reloc is | |
543 | against, RELOC_NAME is the name of the relocation, and ADDEND is | |
544 | any addend that is used. ABFD, SECTION and ADDRESS identify the | |
252b5132 RH |
545 | location at which the overflow occurs; if this is the result of a |
546 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
547 | ABFD will be NULL. */ | |
b34976b6 | 548 | bfd_boolean (*reloc_overflow) |
dfeffb9f L |
549 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
550 | const char *name, const char *reloc_name, bfd_vma addend, | |
551 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 552 | /* A function which is called when a dangerous reloc is performed. |
c17ae8a2 | 553 | MESSAGE is an appropriate message. |
252b5132 RH |
554 | ABFD, SECTION and ADDRESS identify the location at which the |
555 | problem occurred; if this is the result of a | |
556 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
557 | ABFD will be NULL. */ | |
b34976b6 | 558 | bfd_boolean (*reloc_dangerous) |
8cf3f354 AM |
559 | (struct bfd_link_info *, const char *message, |
560 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
561 | /* A function which is called when a reloc is found to be attached |
562 | to a symbol which is not being written out. NAME is the name of | |
563 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
564 | the reloc; if this is the result of a | |
565 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
566 | ABFD will be NULL. */ | |
b34976b6 | 567 | bfd_boolean (*unattached_reloc) |
8cf3f354 AM |
568 | (struct bfd_link_info *, const char *name, |
569 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
570 | /* A function which is called when a symbol in notice_hash is |
571 | defined or referenced. NAME is the symbol. ABFD, SECTION and | |
572 | ADDRESS are the value of the symbol. If SECTION is | |
573 | bfd_und_section, this is a reference. */ | |
b34976b6 | 574 | bfd_boolean (*notice) |
8cf3f354 AM |
575 | (struct bfd_link_info *, const char *name, |
576 | bfd *abfd, asection *section, bfd_vma address); | |
49fa1e15 | 577 | /* Error or warning link info message. */ |
e1fffbe6 AM |
578 | void (*einfo) |
579 | (const char *fmt, ...); | |
49fa1e15 AM |
580 | /* General link info message. */ |
581 | void (*info) | |
582 | (const char *fmt, ...); | |
583 | /* Message to be printed in linker map file. */ | |
584 | void (*minfo) | |
585 | (const char *fmt, ...); | |
2889e75b NC |
586 | /* This callback provides a chance for users of the BFD library to |
587 | override its decision about whether to place two adjacent sections | |
588 | into the same segment. */ | |
589 | bfd_boolean (*override_segment_assignment) | |
590 | (struct bfd_link_info *, bfd * abfd, | |
591 | asection * current_section, asection * previous_section, | |
592 | bfd_boolean new_segment); | |
252b5132 RH |
593 | }; |
594 | \f | |
595 | /* The linker builds link_order structures which tell the code how to | |
596 | include input data in the output file. */ | |
597 | ||
598 | /* These are the types of link_order structures. */ | |
599 | ||
600 | enum bfd_link_order_type | |
601 | { | |
602 | bfd_undefined_link_order, /* Undefined. */ | |
603 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
604 | bfd_data_link_order, /* Set to explicit data. */ |
605 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
606 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
607 | }; | |
608 | ||
609 | /* This is the link_order structure itself. These form a chain | |
6ed89c00 | 610 | attached to the output section whose contents they are describing. */ |
252b5132 | 611 | |
b34976b6 | 612 | struct bfd_link_order |
252b5132 RH |
613 | { |
614 | /* Next link_order in chain. */ | |
615 | struct bfd_link_order *next; | |
616 | /* Type of link_order. */ | |
617 | enum bfd_link_order_type type; | |
618 | /* Offset within output section. */ | |
b34976b6 | 619 | bfd_vma offset; |
252b5132 RH |
620 | /* Size within output section. */ |
621 | bfd_size_type size; | |
622 | /* Type specific information. */ | |
b34976b6 | 623 | union |
252b5132 | 624 | { |
b34976b6 | 625 | struct |
252b5132 RH |
626 | { |
627 | /* Section to include. If this is used, then | |
628 | section->output_section must be the section the | |
629 | link_order is attached to, section->output_offset must | |
eea6121a | 630 | equal the link_order offset field, and section->size |
252b5132 RH |
631 | must equal the link_order size field. Maybe these |
632 | restrictions should be relaxed someday. */ | |
633 | asection *section; | |
634 | } indirect; | |
635 | struct | |
636 | { | |
9a1b9f82 AM |
637 | /* Size of contents, or zero when contents size == size |
638 | within output section. | |
639 | A non-zero value allows filling of the output section | |
640 | with an arbitrary repeated pattern. */ | |
641 | unsigned int size; | |
642 | /* Data to put into file. */ | |
252b5132 RH |
643 | bfd_byte *contents; |
644 | } data; | |
645 | struct | |
646 | { | |
647 | /* Description of reloc to generate. Used for | |
648 | bfd_section_reloc_link_order and | |
649 | bfd_symbol_reloc_link_order. */ | |
650 | struct bfd_link_order_reloc *p; | |
651 | } reloc; | |
652 | } u; | |
653 | }; | |
654 | ||
655 | /* A linker order of type bfd_section_reloc_link_order or | |
656 | bfd_symbol_reloc_link_order means to create a reloc against a | |
657 | section or symbol, respectively. This is used to implement -Ur to | |
658 | generate relocs for the constructor tables. The | |
659 | bfd_link_order_reloc structure describes the reloc that BFD should | |
660 | create. It is similar to a arelent, but I didn't use arelent | |
661 | because the linker does not know anything about most symbols, and | |
662 | any asymbol structure it creates will be partially meaningless. | |
663 | This information could logically be in the bfd_link_order struct, | |
664 | but I didn't want to waste the space since these types of relocs | |
665 | are relatively rare. */ | |
666 | ||
667 | struct bfd_link_order_reloc | |
668 | { | |
669 | /* Reloc type. */ | |
670 | bfd_reloc_code_real_type reloc; | |
671 | ||
672 | union | |
673 | { | |
674 | /* For type bfd_section_reloc_link_order, this is the section | |
675 | the reloc should be against. This must be a section in the | |
676 | output BFD, not any of the input BFDs. */ | |
677 | asection *section; | |
678 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
679 | symbol the reloc should be against. */ | |
680 | const char *name; | |
681 | } u; | |
682 | ||
683 | /* Addend to use. The object file should contain zero. The BFD | |
684 | backend is responsible for filling in the contents of the object | |
685 | file correctly. For some object file formats (e.g., COFF) the | |
686 | addend must be stored into in the object file, and for some | |
687 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
688 | bfd_vma addend; | |
689 | }; | |
690 | ||
691 | /* Allocate a new link_order for a section. */ | |
8cf3f354 | 692 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
252b5132 RH |
693 | |
694 | /* These structures are used to describe version information for the | |
695 | ELF linker. These structures could be manipulated entirely inside | |
696 | BFD, but it would be a pain. Instead, the regular linker sets up | |
697 | these structures, and then passes them into BFD. */ | |
698 | ||
108ba305 | 699 | /* Glob pattern for a version. */ |
252b5132 RH |
700 | |
701 | struct bfd_elf_version_expr | |
702 | { | |
108ba305 | 703 | /* Next glob pattern for this version. */ |
252b5132 | 704 | struct bfd_elf_version_expr *next; |
108ba305 | 705 | /* Glob pattern. */ |
252b5132 | 706 | const char *pattern; |
5e35cbc2 L |
707 | /* NULL for a glob pattern, otherwise a straight symbol. */ |
708 | const char *symbol; | |
31941635 | 709 | /* Defined by ".symver". */ |
108ba305 | 710 | unsigned int symver : 1; |
31941635 L |
711 | /* Defined by version script. */ |
712 | unsigned int script : 1; | |
108ba305 JJ |
713 | /* Pattern type. */ |
714 | #define BFD_ELF_VERSION_C_TYPE 1 | |
715 | #define BFD_ELF_VERSION_CXX_TYPE 2 | |
716 | #define BFD_ELF_VERSION_JAVA_TYPE 4 | |
717 | unsigned int mask : 3; | |
718 | }; | |
719 | ||
720 | struct bfd_elf_version_expr_head | |
721 | { | |
722 | /* List of all patterns, both wildcards and non-wildcards. */ | |
723 | struct bfd_elf_version_expr *list; | |
724 | /* Hash table for non-wildcards. */ | |
725 | void *htab; | |
726 | /* Remaining patterns. */ | |
727 | struct bfd_elf_version_expr *remaining; | |
728 | /* What kind of pattern types are present in list (bitmask). */ | |
729 | unsigned int mask; | |
252b5132 RH |
730 | }; |
731 | ||
732 | /* Version dependencies. */ | |
733 | ||
734 | struct bfd_elf_version_deps | |
735 | { | |
736 | /* Next dependency for this version. */ | |
737 | struct bfd_elf_version_deps *next; | |
738 | /* The version which this version depends upon. */ | |
739 | struct bfd_elf_version_tree *version_needed; | |
740 | }; | |
741 | ||
742 | /* A node in the version tree. */ | |
743 | ||
744 | struct bfd_elf_version_tree | |
745 | { | |
746 | /* Next version. */ | |
747 | struct bfd_elf_version_tree *next; | |
748 | /* Name of this version. */ | |
749 | const char *name; | |
750 | /* Version number. */ | |
751 | unsigned int vernum; | |
752 | /* Regular expressions for global symbols in this version. */ | |
108ba305 | 753 | struct bfd_elf_version_expr_head globals; |
252b5132 | 754 | /* Regular expressions for local symbols in this version. */ |
108ba305 | 755 | struct bfd_elf_version_expr_head locals; |
252b5132 RH |
756 | /* List of versions which this version depends upon. */ |
757 | struct bfd_elf_version_deps *deps; | |
758 | /* Index of the version name. This is used within BFD. */ | |
759 | unsigned int name_indx; | |
760 | /* Whether this version tree was used. This is used within BFD. */ | |
761 | int used; | |
108ba305 JJ |
762 | /* Matching hook. */ |
763 | struct bfd_elf_version_expr *(*match) | |
764 | (struct bfd_elf_version_expr_head *head, | |
765 | struct bfd_elf_version_expr *prev, const char *sym); | |
252b5132 RH |
766 | }; |
767 | ||
55255dae L |
768 | struct bfd_elf_dynamic_list |
769 | { | |
770 | struct bfd_elf_version_expr_head head; | |
771 | struct bfd_elf_version_expr *(*match) | |
772 | (struct bfd_elf_version_expr_head *head, | |
773 | struct bfd_elf_version_expr *prev, const char *sym); | |
774 | }; | |
775 | ||
252b5132 | 776 | #endif |