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, |
aa820537 | 3 | 2003, 2004, 2005, 2006, 2007, 2008, 2009 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 | ||
f88dc410 | 70 | enum bfd_link_common_skip_ar_symbols |
f7c33884 NC |
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 | ||
a50b1753 NC |
78 | struct bfd_link_hash_common_entry |
79 | { | |
80 | unsigned int alignment_power; /* Alignment. */ | |
81 | asection *section; /* Symbol section. */ | |
82 | }; | |
83 | ||
252b5132 RH |
84 | /* The linking routines use a hash table which uses this structure for |
85 | its elements. */ | |
86 | ||
87 | struct bfd_link_hash_entry | |
88 | { | |
89 | /* Base hash table entry structure. */ | |
90 | struct bfd_hash_entry root; | |
6ad841a1 | 91 | |
252b5132 RH |
92 | /* Type of this entry. */ |
93 | enum bfd_link_hash_type type; | |
94 | ||
252b5132 RH |
95 | /* A union of information depending upon the type. */ |
96 | union | |
97 | { | |
98 | /* Nothing is kept for bfd_hash_new. */ | |
99 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ | |
100 | struct | |
101 | { | |
f6e332e6 AM |
102 | /* Undefined and common symbols are kept in a linked list through |
103 | this field. This field is present in all of the union element | |
104 | so that we don't need to remove entries from the list when we | |
105 | change their type. Removing entries would either require the | |
106 | list to be doubly linked, which would waste more memory, or | |
107 | require a traversal. When an undefined or common symbol is | |
108 | created, it should be added to this list, the head of which is in | |
109 | the link hash table itself. As symbols are defined, they need | |
110 | not be removed from the list; anything which reads the list must | |
111 | doublecheck the symbol type. | |
112 | ||
113 | Weak symbols are not kept on this list. | |
114 | ||
115 | Defined and defweak symbols use this field as a reference marker. | |
116 | If the field is not NULL, or this structure is the tail of the | |
117 | undefined symbol list, the symbol has been referenced. If the | |
118 | symbol is undefined and becomes defined, this field will | |
119 | automatically be non-NULL since the symbol will have been on the | |
120 | undefined symbol list. */ | |
121 | struct bfd_link_hash_entry *next; | |
252b5132 | 122 | bfd *abfd; /* BFD symbol was found in. */ |
11f25ea6 | 123 | bfd *weak; /* BFD weak symbol was found in. */ |
252b5132 RH |
124 | } undef; |
125 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ | |
126 | struct | |
127 | { | |
f6e332e6 | 128 | struct bfd_link_hash_entry *next; |
252b5132 | 129 | asection *section; /* Symbol section. */ |
f6e332e6 | 130 | bfd_vma value; /* Symbol value. */ |
252b5132 RH |
131 | } def; |
132 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ | |
133 | struct | |
134 | { | |
f6e332e6 | 135 | struct bfd_link_hash_entry *next; |
252b5132 RH |
136 | struct bfd_link_hash_entry *link; /* Real symbol. */ |
137 | const char *warning; /* Warning (bfd_link_hash_warning only). */ | |
138 | } i; | |
139 | /* bfd_link_hash_common. */ | |
140 | struct | |
141 | { | |
f6e332e6 | 142 | struct bfd_link_hash_entry *next; |
252b5132 | 143 | /* The linker needs to know three things about common |
b34976b6 AM |
144 | symbols: the size, the alignment, and the section in |
145 | which the symbol should be placed. We store the size | |
146 | here, and we allocate a small structure to hold the | |
147 | section and the alignment. The alignment is stored as a | |
148 | power of two. We don't store all the information | |
149 | directly because we don't want to increase the size of | |
150 | the union; this structure is a major space user in the | |
151 | linker. */ | |
a50b1753 | 152 | struct bfd_link_hash_common_entry *p; |
f6e332e6 | 153 | bfd_size_type size; /* Common symbol size. */ |
252b5132 RH |
154 | } c; |
155 | } u; | |
156 | }; | |
157 | ||
158 | /* This is the link hash table. It is a derived class of | |
159 | bfd_hash_table. */ | |
160 | ||
161 | struct bfd_link_hash_table | |
162 | { | |
163 | /* The hash table itself. */ | |
164 | struct bfd_hash_table table; | |
252b5132 RH |
165 | /* A linked list of undefined and common symbols, linked through the |
166 | next field in the bfd_link_hash_entry structure. */ | |
167 | struct bfd_link_hash_entry *undefs; | |
168 | /* Entries are added to the tail of the undefs list. */ | |
169 | struct bfd_link_hash_entry *undefs_tail; | |
b9b171fb | 170 | /* The type of the link hash table. */ |
8ea2e4bd | 171 | enum bfd_link_hash_table_type type; |
252b5132 RH |
172 | }; |
173 | ||
b34976b6 | 174 | /* Look up an entry in a link hash table. If FOLLOW is TRUE, this |
252b5132 RH |
175 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to |
176 | the real symbol. */ | |
177 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup | |
8cf3f354 AM |
178 | (struct bfd_link_hash_table *, const char *, bfd_boolean create, |
179 | bfd_boolean copy, bfd_boolean follow); | |
252b5132 RH |
180 | |
181 | /* Look up an entry in the main linker hash table if the symbol might | |
182 | be wrapped. This should only be used for references to an | |
183 | undefined symbol, not for definitions of a symbol. */ | |
184 | ||
185 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup | |
8cf3f354 AM |
186 | (bfd *, struct bfd_link_info *, const char *, bfd_boolean, |
187 | bfd_boolean, bfd_boolean); | |
252b5132 RH |
188 | |
189 | /* Traverse a link hash table. */ | |
190 | extern void bfd_link_hash_traverse | |
8cf3f354 AM |
191 | (struct bfd_link_hash_table *, |
192 | bfd_boolean (*) (struct bfd_link_hash_entry *, void *), | |
193 | void *); | |
252b5132 RH |
194 | |
195 | /* Add an entry to the undefs list. */ | |
196 | extern void bfd_link_add_undef | |
8cf3f354 | 197 | (struct bfd_link_hash_table *, struct bfd_link_hash_entry *); |
7815cf4f | 198 | |
77cfaee6 AM |
199 | /* Remove symbols from the undefs list that don't belong there. */ |
200 | extern void bfd_link_repair_undef_list | |
201 | (struct bfd_link_hash_table *table); | |
202 | ||
5c1d2f5f AM |
203 | /* Read symbols and cache symbol pointer array in outsymbols. */ |
204 | extern bfd_boolean bfd_generic_link_read_symbols (bfd *); | |
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 | ||
a0c402a5 L |
327 | /* TRUE if we should warn alternate ELF machine code. */ |
328 | unsigned int warn_alternate_em: 1; | |
329 | ||
57316bff L |
330 | /* TRUE if unreferenced sections should be removed. */ |
331 | unsigned int gc_sections: 1; | |
332 | ||
c17d87de NC |
333 | /* TRUE if user shoudl be informed of removed unreferenced sections. */ |
334 | unsigned int print_gc_sections: 1; | |
335 | ||
fdc90cb4 JJ |
336 | /* TRUE if .hash section should be created. */ |
337 | unsigned int emit_hash: 1; | |
338 | ||
339 | /* TRUE if .gnu.hash section should be created. */ | |
340 | unsigned int emit_gnu_hash: 1; | |
341 | ||
c0f00686 L |
342 | /* If TRUE reduce memory overheads, at the expense of speed. This will |
343 | cause map file generation to use an O(N^2) algorithm and disable | |
344 | caching ELF symbol buffer. */ | |
345 | unsigned int reduce_memory_overheads: 1; | |
346 | ||
40b36307 L |
347 | /* TRUE if all data symbols should be dynamic. */ |
348 | unsigned int dynamic_data: 1; | |
349 | ||
350 | /* TRUE if some symbols have to be dynamic, controlled by | |
351 | --dynamic-list command line options. */ | |
352 | unsigned int dynamic: 1; | |
353 | ||
ab24bc21 RM |
354 | /* Non-NULL if .note.gnu.build-id section should be created. */ |
355 | char *emit_note_gnu_build_id; | |
356 | ||
560e09e9 | 357 | /* What to do with unresolved symbols in an object file. |
59c2e50f L |
358 | When producing executables the default is GENERATE_ERROR. |
359 | When producing shared libraries the default is IGNORE. The | |
360 | assumption with shared libraries is that the reference will be | |
560e09e9 NC |
361 | resolved at load/execution time. */ |
362 | enum report_method unresolved_syms_in_objects; | |
363 | ||
364 | /* What to do with unresolved symbols in a shared library. | |
365 | The same defaults apply. */ | |
366 | enum report_method unresolved_syms_in_shared_libs; | |
367 | ||
252b5132 RH |
368 | /* Which symbols to strip. */ |
369 | enum bfd_link_strip strip; | |
7815cf4f | 370 | |
252b5132 RH |
371 | /* Which local symbols to discard. */ |
372 | enum bfd_link_discard discard; | |
7815cf4f | 373 | |
f88dc410 | 374 | /* Criteria for skipping symbols when determining |
cddd0089 | 375 | whether to include an object from an archive. */ |
f88dc410 | 376 | enum bfd_link_common_skip_ar_symbols common_skip_ar_symbols; |
7815cf4f | 377 | |
b9cf773d AM |
378 | /* Char that may appear as the first char of a symbol, but should be |
379 | skipped (like symbol_leading_char) when looking up symbols in | |
380 | wrap_hash. Used by PowerPC Linux for 'dot' symbols. */ | |
381 | char wrap_char; | |
382 | ||
97407faf AM |
383 | /* Separator between archive and filename in linker script filespecs. */ |
384 | char path_separator; | |
385 | ||
cddd0089 AM |
386 | /* Function callbacks. */ |
387 | const struct bfd_link_callbacks *callbacks; | |
7815cf4f | 388 | |
252b5132 RH |
389 | /* Hash table handled by BFD. */ |
390 | struct bfd_link_hash_table *hash; | |
7815cf4f | 391 | |
252b5132 RH |
392 | /* Hash table of symbols to keep. This is NULL unless strip is |
393 | strip_some. */ | |
394 | struct bfd_hash_table *keep_hash; | |
7815cf4f | 395 | |
252b5132 | 396 | /* Hash table of symbols to report back via the notice callback. If |
b34976b6 | 397 | this is NULL, and notice_all is FALSE, then no symbols are |
252b5132 RH |
398 | reported back. */ |
399 | struct bfd_hash_table *notice_hash; | |
7815cf4f | 400 | |
252b5132 RH |
401 | /* Hash table of symbols which are being wrapped (the --wrap linker |
402 | option). If this is NULL, no symbols are being wrapped. */ | |
403 | struct bfd_hash_table *wrap_hash; | |
7815cf4f | 404 | |
f13a99db AM |
405 | /* The output BFD. */ |
406 | bfd *output_bfd; | |
407 | ||
cddd0089 AM |
408 | /* The list of input BFD's involved in the link. These are chained |
409 | together via the link_next field. */ | |
410 | bfd *input_bfds; | |
a9a4c53e | 411 | bfd **input_bfds_tail; |
cddd0089 AM |
412 | |
413 | /* If a symbol should be created for each input BFD, this is section | |
414 | where those symbols should be placed. It must be a section in | |
415 | the output BFD. It may be NULL, in which case no such symbols | |
416 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
417 | linker command language. */ | |
418 | asection *create_object_symbols_section; | |
419 | ||
420 | /* List of global symbol names that are starting points for marking | |
421 | sections against garbage collection. */ | |
422 | struct bfd_sym_chain *gc_sym_list; | |
423 | ||
252b5132 | 424 | /* If a base output file is wanted, then this points to it */ |
8cf3f354 | 425 | void *base_file; |
252b5132 | 426 | |
94883c63 MM |
427 | /* The function to call when the executable or shared object is |
428 | loaded. */ | |
429 | const char *init_function; | |
7815cf4f | 430 | |
94883c63 MM |
431 | /* The function to call when the executable or shared object is |
432 | unloaded. */ | |
433 | const char *fini_function; | |
9bfcb6d6 | 434 | |
fbbc3759 L |
435 | /* Number of relaxation passes. Usually only one relaxation pass |
436 | is needed. But a backend can have as many relaxation passes as | |
437 | necessary. During bfd_relax_section call, it is set to the | |
438 | current pass, starting from 0. */ | |
439 | int relax_pass; | |
440 | ||
4a828aab RH |
441 | /* Number of relaxation trips. This number is incremented every |
442 | time the relaxation pass is restarted due to a previous | |
443 | relaxation returning true in *AGAIN. */ | |
444 | int relax_trip; | |
445 | ||
b34976b6 | 446 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
e0076ab3 NC |
447 | should be generated/linked against. Set to 1 if this feature |
448 | is explicitly requested by the user, -1 if enabled by default. */ | |
449 | int pei386_auto_import; | |
db6751f2 | 450 | |
2fa9fc65 NC |
451 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
452 | in pei386 DLLs should be generated. Set to 1 if this feature | |
453 | is explicitly requested by the user, -1 if enabled by default. */ | |
454 | int pei386_runtime_pseudo_reloc; | |
455 | ||
db6751f2 | 456 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 457 | unsigned int spare_dynamic_tags; |
f7c33884 | 458 | |
cddd0089 AM |
459 | /* May be used to set DT_FLAGS for ELF. */ |
460 | bfd_vma flags; | |
461 | ||
462 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
463 | bfd_vma flags_1; | |
8c37241b JJ |
464 | |
465 | /* Start and end of RELRO region. */ | |
466 | bfd_vma relro_start, relro_end; | |
55255dae L |
467 | |
468 | /* List of symbols should be dynamic. */ | |
40b36307 | 469 | struct bfd_elf_dynamic_list *dynamic_list; |
252b5132 RH |
470 | }; |
471 | ||
49fa1e15 AM |
472 | /* This structures holds a set of callback functions. These are called |
473 | by the BFD linker routines. Except for the info functions, the first | |
e1fffbe6 AM |
474 | argument to each callback function is the bfd_link_info structure |
475 | being used and each function returns a boolean value. If the | |
476 | function returns FALSE, then the BFD function which called it should | |
477 | return with a failure indication. */ | |
252b5132 RH |
478 | |
479 | struct bfd_link_callbacks | |
480 | { | |
481 | /* A function which is called when an object is added from an | |
482 | archive. ABFD is the archive element being added. NAME is the | |
483 | name of the symbol which caused the archive element to be pulled | |
5d3236ee DK |
484 | in. This function may set *SUBSBFD to point to an alternative |
485 | BFD from which symbols should in fact be added in place of the | |
486 | original BFD's symbols. */ | |
b34976b6 | 487 | bfd_boolean (*add_archive_element) |
5d3236ee | 488 | (struct bfd_link_info *, bfd *abfd, const char *name, bfd **subsbfd); |
252b5132 RH |
489 | /* A function which is called when a symbol is found with multiple |
490 | definitions. NAME is the symbol which is defined multiple times. | |
491 | OBFD is the old BFD, OSEC is the old section, OVAL is the old | |
492 | value, NBFD is the new BFD, NSEC is the new section, and NVAL is | |
493 | the new value. OBFD may be NULL. OSEC and NSEC may be | |
494 | bfd_com_section or bfd_ind_section. */ | |
b34976b6 | 495 | bfd_boolean (*multiple_definition) |
8cf3f354 AM |
496 | (struct bfd_link_info *, const char *name, |
497 | bfd *obfd, asection *osec, bfd_vma oval, | |
498 | bfd *nbfd, asection *nsec, bfd_vma nval); | |
252b5132 RH |
499 | /* A function which is called when a common symbol is defined |
500 | multiple times. NAME is the symbol appearing multiple times. | |
501 | OBFD is the BFD of the existing symbol; it may be NULL if this is | |
502 | not known. OTYPE is the type of the existing symbol, which may | |
503 | be bfd_link_hash_defined, bfd_link_hash_defweak, | |
504 | bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is | |
505 | bfd_link_hash_common, OSIZE is the size of the existing symbol. | |
506 | NBFD is the BFD of the new symbol. NTYPE is the type of the new | |
507 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
508 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
509 | is the size of the new symbol. */ | |
b34976b6 | 510 | bfd_boolean (*multiple_common) |
8cf3f354 AM |
511 | (struct bfd_link_info *, const char *name, |
512 | bfd *obfd, enum bfd_link_hash_type otype, bfd_vma osize, | |
513 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); | |
252b5132 RH |
514 | /* A function which is called to add a symbol to a set. ENTRY is |
515 | the link hash table entry for the set itself (e.g., | |
516 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
1049f94e | 517 | the set when generating a relocatable file, and is also used to |
252b5132 RH |
518 | get the size of the entry when generating an executable file. |
519 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
b34976b6 | 520 | bfd_boolean (*add_to_set) |
8cf3f354 AM |
521 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
522 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
523 | /* A function which is called when the name of a g++ constructor or |
524 | destructor is found. This is only called by some object file | |
b34976b6 | 525 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
252b5132 | 526 | destructor. This will use BFD_RELOC_CTOR when generating a |
1049f94e | 527 | relocatable file. NAME is the name of the symbol found. ABFD, |
252b5132 | 528 | SECTION and VALUE are the value of the symbol. */ |
b34976b6 | 529 | bfd_boolean (*constructor) |
8cf3f354 AM |
530 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
531 | bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
532 | /* A function which is called to issue a linker warning. For |
533 | example, this is called when there is a reference to a warning | |
534 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
535 | of the symbol which triggered the warning; it may be NULL if | |
536 | there is none. ABFD, SECTION and ADDRESS identify the location | |
537 | which trigerred the warning; either ABFD or SECTION or both may | |
538 | be NULL if the location is not known. */ | |
b34976b6 | 539 | bfd_boolean (*warning) |
8cf3f354 AM |
540 | (struct bfd_link_info *, const char *warning, const char *symbol, |
541 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
542 | /* A function which is called when a relocation is attempted against |
543 | an undefined symbol. NAME is the symbol which is undefined. | |
544 | ABFD, SECTION and ADDRESS identify the location from which the | |
e7f8eadb | 545 | reference is made. IS_FATAL indicates whether an undefined symbol is |
c086cbc6 | 546 | a fatal error or not. In some cases SECTION may be NULL. */ |
b34976b6 | 547 | bfd_boolean (*undefined_symbol) |
8cf3f354 | 548 | (struct bfd_link_info *, const char *name, bfd *abfd, |
e7f8eadb | 549 | asection *section, bfd_vma address, bfd_boolean is_fatal); |
dfeffb9f L |
550 | /* A function which is called when a reloc overflow occurs. ENTRY is |
551 | the link hash table entry for the symbol the reloc is against. | |
552 | NAME is the name of the local symbol or section the reloc is | |
553 | against, RELOC_NAME is the name of the relocation, and ADDEND is | |
554 | any addend that is used. ABFD, SECTION and ADDRESS identify the | |
252b5132 RH |
555 | location at which the overflow occurs; 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_overflow) |
dfeffb9f L |
559 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
560 | const char *name, const char *reloc_name, bfd_vma addend, | |
561 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 | 562 | /* A function which is called when a dangerous reloc is performed. |
c17ae8a2 | 563 | MESSAGE is an appropriate message. |
252b5132 RH |
564 | ABFD, SECTION and ADDRESS identify the location at which the |
565 | problem occurred; if this is the result of a | |
566 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
567 | ABFD will be NULL. */ | |
b34976b6 | 568 | bfd_boolean (*reloc_dangerous) |
8cf3f354 AM |
569 | (struct bfd_link_info *, const char *message, |
570 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
571 | /* A function which is called when a reloc is found to be attached |
572 | to a symbol which is not being written out. NAME is the name of | |
573 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
574 | the reloc; if this is the result of a | |
575 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
576 | ABFD will be NULL. */ | |
b34976b6 | 577 | bfd_boolean (*unattached_reloc) |
8cf3f354 AM |
578 | (struct bfd_link_info *, const char *name, |
579 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
580 | /* A function which is called when a symbol in notice_hash is |
581 | defined or referenced. NAME is the symbol. ABFD, SECTION and | |
582 | ADDRESS are the value of the symbol. If SECTION is | |
583 | bfd_und_section, this is a reference. */ | |
b34976b6 | 584 | bfd_boolean (*notice) |
8cf3f354 AM |
585 | (struct bfd_link_info *, const char *name, |
586 | bfd *abfd, asection *section, bfd_vma address); | |
49fa1e15 | 587 | /* Error or warning link info message. */ |
e1fffbe6 AM |
588 | void (*einfo) |
589 | (const char *fmt, ...); | |
49fa1e15 AM |
590 | /* General link info message. */ |
591 | void (*info) | |
592 | (const char *fmt, ...); | |
593 | /* Message to be printed in linker map file. */ | |
594 | void (*minfo) | |
595 | (const char *fmt, ...); | |
2889e75b NC |
596 | /* This callback provides a chance for users of the BFD library to |
597 | override its decision about whether to place two adjacent sections | |
598 | into the same segment. */ | |
599 | bfd_boolean (*override_segment_assignment) | |
600 | (struct bfd_link_info *, bfd * abfd, | |
601 | asection * current_section, asection * previous_section, | |
602 | bfd_boolean new_segment); | |
252b5132 RH |
603 | }; |
604 | \f | |
605 | /* The linker builds link_order structures which tell the code how to | |
606 | include input data in the output file. */ | |
607 | ||
608 | /* These are the types of link_order structures. */ | |
609 | ||
610 | enum bfd_link_order_type | |
611 | { | |
612 | bfd_undefined_link_order, /* Undefined. */ | |
613 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
614 | bfd_data_link_order, /* Set to explicit data. */ |
615 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
616 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
617 | }; | |
618 | ||
619 | /* This is the link_order structure itself. These form a chain | |
6ed89c00 | 620 | attached to the output section whose contents they are describing. */ |
252b5132 | 621 | |
b34976b6 | 622 | struct bfd_link_order |
252b5132 RH |
623 | { |
624 | /* Next link_order in chain. */ | |
625 | struct bfd_link_order *next; | |
626 | /* Type of link_order. */ | |
627 | enum bfd_link_order_type type; | |
628 | /* Offset within output section. */ | |
b34976b6 | 629 | bfd_vma offset; |
252b5132 RH |
630 | /* Size within output section. */ |
631 | bfd_size_type size; | |
632 | /* Type specific information. */ | |
b34976b6 | 633 | union |
252b5132 | 634 | { |
b34976b6 | 635 | struct |
252b5132 RH |
636 | { |
637 | /* Section to include. If this is used, then | |
638 | section->output_section must be the section the | |
639 | link_order is attached to, section->output_offset must | |
eea6121a | 640 | equal the link_order offset field, and section->size |
252b5132 RH |
641 | must equal the link_order size field. Maybe these |
642 | restrictions should be relaxed someday. */ | |
643 | asection *section; | |
644 | } indirect; | |
645 | struct | |
646 | { | |
9a1b9f82 AM |
647 | /* Size of contents, or zero when contents size == size |
648 | within output section. | |
649 | A non-zero value allows filling of the output section | |
650 | with an arbitrary repeated pattern. */ | |
651 | unsigned int size; | |
652 | /* Data to put into file. */ | |
252b5132 RH |
653 | bfd_byte *contents; |
654 | } data; | |
655 | struct | |
656 | { | |
657 | /* Description of reloc to generate. Used for | |
658 | bfd_section_reloc_link_order and | |
659 | bfd_symbol_reloc_link_order. */ | |
660 | struct bfd_link_order_reloc *p; | |
661 | } reloc; | |
662 | } u; | |
663 | }; | |
664 | ||
665 | /* A linker order of type bfd_section_reloc_link_order or | |
666 | bfd_symbol_reloc_link_order means to create a reloc against a | |
667 | section or symbol, respectively. This is used to implement -Ur to | |
668 | generate relocs for the constructor tables. The | |
669 | bfd_link_order_reloc structure describes the reloc that BFD should | |
670 | create. It is similar to a arelent, but I didn't use arelent | |
671 | because the linker does not know anything about most symbols, and | |
672 | any asymbol structure it creates will be partially meaningless. | |
673 | This information could logically be in the bfd_link_order struct, | |
674 | but I didn't want to waste the space since these types of relocs | |
675 | are relatively rare. */ | |
676 | ||
677 | struct bfd_link_order_reloc | |
678 | { | |
679 | /* Reloc type. */ | |
680 | bfd_reloc_code_real_type reloc; | |
681 | ||
682 | union | |
683 | { | |
684 | /* For type bfd_section_reloc_link_order, this is the section | |
685 | the reloc should be against. This must be a section in the | |
686 | output BFD, not any of the input BFDs. */ | |
687 | asection *section; | |
688 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
689 | symbol the reloc should be against. */ | |
690 | const char *name; | |
691 | } u; | |
692 | ||
693 | /* Addend to use. The object file should contain zero. The BFD | |
694 | backend is responsible for filling in the contents of the object | |
695 | file correctly. For some object file formats (e.g., COFF) the | |
696 | addend must be stored into in the object file, and for some | |
697 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
698 | bfd_vma addend; | |
699 | }; | |
700 | ||
701 | /* Allocate a new link_order for a section. */ | |
8cf3f354 | 702 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
252b5132 RH |
703 | |
704 | /* These structures are used to describe version information for the | |
705 | ELF linker. These structures could be manipulated entirely inside | |
706 | BFD, but it would be a pain. Instead, the regular linker sets up | |
707 | these structures, and then passes them into BFD. */ | |
708 | ||
108ba305 | 709 | /* Glob pattern for a version. */ |
252b5132 RH |
710 | |
711 | struct bfd_elf_version_expr | |
712 | { | |
108ba305 | 713 | /* Next glob pattern for this version. */ |
252b5132 | 714 | struct bfd_elf_version_expr *next; |
108ba305 | 715 | /* Glob pattern. */ |
252b5132 | 716 | const char *pattern; |
ae5a3597 AM |
717 | /* Set if pattern is not a glob. */ |
718 | unsigned int literal : 1; | |
31941635 | 719 | /* Defined by ".symver". */ |
108ba305 | 720 | unsigned int symver : 1; |
31941635 L |
721 | /* Defined by version script. */ |
722 | unsigned int script : 1; | |
108ba305 JJ |
723 | /* Pattern type. */ |
724 | #define BFD_ELF_VERSION_C_TYPE 1 | |
725 | #define BFD_ELF_VERSION_CXX_TYPE 2 | |
726 | #define BFD_ELF_VERSION_JAVA_TYPE 4 | |
727 | unsigned int mask : 3; | |
728 | }; | |
729 | ||
730 | struct bfd_elf_version_expr_head | |
731 | { | |
732 | /* List of all patterns, both wildcards and non-wildcards. */ | |
733 | struct bfd_elf_version_expr *list; | |
734 | /* Hash table for non-wildcards. */ | |
735 | void *htab; | |
736 | /* Remaining patterns. */ | |
737 | struct bfd_elf_version_expr *remaining; | |
738 | /* What kind of pattern types are present in list (bitmask). */ | |
739 | unsigned int mask; | |
252b5132 RH |
740 | }; |
741 | ||
742 | /* Version dependencies. */ | |
743 | ||
744 | struct bfd_elf_version_deps | |
745 | { | |
746 | /* Next dependency for this version. */ | |
747 | struct bfd_elf_version_deps *next; | |
748 | /* The version which this version depends upon. */ | |
749 | struct bfd_elf_version_tree *version_needed; | |
750 | }; | |
751 | ||
752 | /* A node in the version tree. */ | |
753 | ||
754 | struct bfd_elf_version_tree | |
755 | { | |
756 | /* Next version. */ | |
757 | struct bfd_elf_version_tree *next; | |
758 | /* Name of this version. */ | |
759 | const char *name; | |
760 | /* Version number. */ | |
761 | unsigned int vernum; | |
762 | /* Regular expressions for global symbols in this version. */ | |
108ba305 | 763 | struct bfd_elf_version_expr_head globals; |
252b5132 | 764 | /* Regular expressions for local symbols in this version. */ |
108ba305 | 765 | struct bfd_elf_version_expr_head locals; |
252b5132 RH |
766 | /* List of versions which this version depends upon. */ |
767 | struct bfd_elf_version_deps *deps; | |
768 | /* Index of the version name. This is used within BFD. */ | |
769 | unsigned int name_indx; | |
770 | /* Whether this version tree was used. This is used within BFD. */ | |
771 | int used; | |
108ba305 JJ |
772 | /* Matching hook. */ |
773 | struct bfd_elf_version_expr *(*match) | |
774 | (struct bfd_elf_version_expr_head *head, | |
775 | struct bfd_elf_version_expr *prev, const char *sym); | |
252b5132 RH |
776 | }; |
777 | ||
55255dae L |
778 | struct bfd_elf_dynamic_list |
779 | { | |
780 | struct bfd_elf_version_expr_head head; | |
781 | struct bfd_elf_version_expr *(*match) | |
782 | (struct bfd_elf_version_expr_head *head, | |
783 | struct bfd_elf_version_expr *prev, const char *sym); | |
784 | }; | |
785 | ||
252b5132 | 786 | #endif |