Commit | Line | Data |
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252b5132 | 1 | /* bfdlink.h -- header file for BFD link routines |
1049f94e | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003 |
4f1d9bd8 | 3 | 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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
252b5132 RH |
21 | |
22 | #ifndef BFDLINK_H | |
23 | #define BFDLINK_H | |
24 | ||
25 | /* Which symbols to strip during a link. */ | |
26 | enum bfd_link_strip | |
27 | { | |
28 | strip_none, /* Don't strip any symbols. */ | |
29 | strip_debugger, /* Strip debugging symbols. */ | |
30 | strip_some, /* keep_hash is the list of symbols to keep. */ | |
31 | strip_all /* Strip all symbols. */ | |
32 | }; | |
33 | ||
34 | /* Which local symbols to discard during a link. This is irrelevant | |
35 | if strip_all is used. */ | |
36 | enum bfd_link_discard | |
37 | { | |
f5fa8ca2 JJ |
38 | discard_sec_merge, /* Discard local temporary symbols in SEC_MERGE |
39 | sections. */ | |
252b5132 RH |
40 | discard_none, /* Don't discard any locals. */ |
41 | discard_l, /* Discard local temporary symbols. */ | |
42 | discard_all /* Discard all locals. */ | |
43 | }; | |
8ea2e4bd NC |
44 | |
45 | /* Describes the type of hash table entry structure being used. | |
46 | Different hash table structure have different fields and so | |
47 | support different linking features. */ | |
48 | enum bfd_link_hash_table_type | |
49 | { | |
50 | bfd_link_generic_hash_table, | |
51 | bfd_link_elf_hash_table | |
52 | }; | |
252b5132 RH |
53 | \f |
54 | /* These are the possible types of an entry in the BFD link hash | |
55 | table. */ | |
56 | ||
57 | enum bfd_link_hash_type | |
58 | { | |
59 | bfd_link_hash_new, /* Symbol is new. */ | |
60 | bfd_link_hash_undefined, /* Symbol seen before, but undefined. */ | |
61 | bfd_link_hash_undefweak, /* Symbol is weak and undefined. */ | |
62 | bfd_link_hash_defined, /* Symbol is defined. */ | |
63 | bfd_link_hash_defweak, /* Symbol is weak and defined. */ | |
64 | bfd_link_hash_common, /* Symbol is common. */ | |
65 | bfd_link_hash_indirect, /* Symbol is an indirect link. */ | |
66 | bfd_link_hash_warning /* Like indirect, but warn if referenced. */ | |
67 | }; | |
68 | ||
f7c33884 NC |
69 | enum bfd_link_common_skip_ar_aymbols |
70 | { | |
71 | bfd_link_common_skip_none, | |
72 | bfd_link_common_skip_text, | |
73 | bfd_link_common_skip_data, | |
74 | bfd_link_common_skip_all | |
75 | }; | |
76 | ||
252b5132 RH |
77 | /* The linking routines use a hash table which uses this structure for |
78 | its elements. */ | |
79 | ||
80 | struct bfd_link_hash_entry | |
81 | { | |
82 | /* Base hash table entry structure. */ | |
83 | struct bfd_hash_entry root; | |
6ad841a1 | 84 | |
252b5132 RH |
85 | /* Type of this entry. */ |
86 | enum bfd_link_hash_type type; | |
87 | ||
88 | /* Undefined and common symbols are kept in a linked list through | |
89 | this field. This field is not in the union because that would | |
90 | force us to remove entries from the list when we changed their | |
91 | type, which would force the list to be doubly linked, which would | |
92 | waste more memory. When an undefined or common symbol is | |
93 | created, it should be added to this list, the head of which is in | |
94 | the link hash table itself. As symbols are defined, they need | |
95 | not be removed from the list; anything which reads the list must | |
96 | doublecheck the symbol type. | |
97 | ||
98 | Weak symbols are not kept on this list. | |
99 | ||
100 | Defined and defweak symbols use this field as a reference marker. | |
101 | If the field is not NULL, or this structure is the tail of the | |
102 | undefined symbol list, the symbol has been referenced. If the | |
103 | symbol is undefined and becomes defined, this field will | |
104 | automatically be non-NULL since the symbol will have been on the | |
105 | undefined symbol list. */ | |
6ad841a1 AM |
106 | struct bfd_link_hash_entry *und_next; |
107 | ||
252b5132 RH |
108 | /* A union of information depending upon the type. */ |
109 | union | |
110 | { | |
111 | /* Nothing is kept for bfd_hash_new. */ | |
112 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ | |
113 | struct | |
114 | { | |
115 | bfd *abfd; /* BFD symbol was found in. */ | |
116 | } undef; | |
117 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ | |
118 | struct | |
119 | { | |
120 | bfd_vma value; /* Symbol value. */ | |
121 | asection *section; /* Symbol section. */ | |
122 | } def; | |
123 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ | |
124 | struct | |
125 | { | |
126 | struct bfd_link_hash_entry *link; /* Real symbol. */ | |
127 | const char *warning; /* Warning (bfd_link_hash_warning only). */ | |
128 | } i; | |
129 | /* bfd_link_hash_common. */ | |
130 | struct | |
131 | { | |
132 | /* The linker needs to know three things about common | |
b34976b6 AM |
133 | symbols: the size, the alignment, and the section in |
134 | which the symbol should be placed. We store the size | |
135 | here, and we allocate a small structure to hold the | |
136 | section and the alignment. The alignment is stored as a | |
137 | power of two. We don't store all the information | |
138 | directly because we don't want to increase the size of | |
139 | the union; this structure is a major space user in the | |
140 | linker. */ | |
252b5132 RH |
141 | bfd_size_type size; /* Common symbol size. */ |
142 | struct bfd_link_hash_common_entry | |
143 | { | |
144 | unsigned int alignment_power; /* Alignment. */ | |
145 | asection *section; /* Symbol section. */ | |
146 | } *p; | |
147 | } c; | |
148 | } u; | |
149 | }; | |
150 | ||
151 | /* This is the link hash table. It is a derived class of | |
152 | bfd_hash_table. */ | |
153 | ||
154 | struct bfd_link_hash_table | |
155 | { | |
156 | /* The hash table itself. */ | |
157 | struct bfd_hash_table table; | |
158 | /* The back end which created this hash table. This indicates the | |
159 | type of the entries in the hash table, which is sometimes | |
160 | important information when linking object files of different | |
161 | types together. */ | |
162 | const bfd_target *creator; | |
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 AM |
196 | |
197 | struct bfd_sym_chain | |
198 | { | |
199 | struct bfd_sym_chain *next; | |
200 | const char *name; | |
201 | }; | |
252b5132 | 202 | \f |
560e09e9 NC |
203 | /* How to handle unresolved symbols. |
204 | There are four possibilities which are enumerated below: */ | |
205 | enum report_method | |
206 | { | |
207 | /* This is the initial value when then link_info structure is created. | |
208 | It allows the various stages of the linker to determine whether they | |
209 | allowed to set the value. */ | |
210 | RM_NOT_YET_SET = 0, | |
211 | RM_IGNORE, | |
212 | RM_GENERATE_WARNING, | |
213 | RM_GENERATE_ERROR | |
214 | }; | |
215 | ||
252b5132 RH |
216 | /* This structure holds all the information needed to communicate |
217 | between BFD and the linker when doing a link. */ | |
218 | ||
219 | struct bfd_link_info | |
220 | { | |
cddd0089 | 221 | /* TRUE if BFD should generate a relocatable object file. */ |
1049f94e | 222 | unsigned int relocatable: 1; |
7815cf4f | 223 | |
b34976b6 | 224 | /* TRUE if BFD should generate relocation information in the final |
7815cf4f | 225 | executable. */ |
cddd0089 | 226 | unsigned int emitrelocations: 1; |
7815cf4f | 227 | |
b34976b6 | 228 | /* TRUE if BFD should generate a "task linked" object file, |
7815cf4f AM |
229 | similar to relocatable but also with globals converted to |
230 | statics. */ | |
cddd0089 | 231 | unsigned int task_link: 1; |
7815cf4f | 232 | |
b34976b6 | 233 | /* TRUE if BFD should generate a shared object. */ |
cddd0089 | 234 | unsigned int shared: 1; |
7815cf4f | 235 | |
b34976b6 | 236 | /* TRUE if BFD should pre-bind symbols in a shared object. */ |
cddd0089 | 237 | unsigned int symbolic: 1; |
7815cf4f | 238 | |
b34976b6 | 239 | /* TRUE if BFD should export all symbols in the dynamic symbol table |
7be4069c | 240 | of an executable, rather than only those used. */ |
cddd0089 | 241 | unsigned int export_dynamic: 1; |
7815cf4f | 242 | |
b34976b6 | 243 | /* TRUE if shared objects should be linked directly, not shared. */ |
cddd0089 | 244 | unsigned int static_link: 1; |
7815cf4f | 245 | |
b34976b6 | 246 | /* TRUE if the output file should be in a traditional format. This |
252b5132 RH |
247 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag |
248 | on the output file, but may be checked when reading the input | |
249 | files. */ | |
cddd0089 | 250 | unsigned int traditional_format: 1; |
7815cf4f | 251 | |
b34976b6 | 252 | /* TRUE if we want to produced optimized output files. This might |
252b5132 | 253 | need much more time and therefore must be explicitly selected. */ |
cddd0089 | 254 | unsigned int optimize: 1; |
7815cf4f | 255 | |
b34976b6 | 256 | /* TRUE if ok to have multiple definition. */ |
cddd0089 | 257 | unsigned int allow_multiple_definition: 1; |
7815cf4f | 258 | |
b34976b6 | 259 | /* TRUE if ok to have version with no definition. */ |
cddd0089 AM |
260 | unsigned int allow_undefined_version: 1; |
261 | ||
262 | /* TRUE if symbols should be retained in memory, FALSE if they | |
263 | should be freed and reread. */ | |
264 | unsigned int keep_memory: 1; | |
265 | ||
266 | /* TRUE if every symbol should be reported back via the notice | |
267 | callback. */ | |
268 | unsigned int notice_all: 1; | |
269 | ||
270 | /* TRUE if executable should not contain copy relocs. | |
271 | Setting this true may result in a non-sharable text segment. */ | |
272 | unsigned int nocopyreloc: 1; | |
273 | ||
274 | /* TRUE if the new ELF dynamic tags are enabled. */ | |
275 | unsigned int new_dtags: 1; | |
276 | ||
277 | /* TRUE if non-PLT relocs should be merged into one reloc section | |
278 | and sorted so that relocs against the same symbol come together. */ | |
279 | unsigned int combreloc: 1; | |
280 | ||
281 | /* TRUE if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment | |
282 | should be created. */ | |
283 | unsigned int eh_frame_hdr: 1; | |
31941635 | 284 | |
c6b64018 AM |
285 | /* TRUE if global symbols in discarded sections should be stripped. */ |
286 | unsigned int strip_discarded: 1; | |
287 | ||
d9c458fc L |
288 | /* TRUE if the final relax pass is needed. */ |
289 | unsigned int need_relax_finalize: 1; | |
c7996ad6 | 290 | |
36af4a4e JJ |
291 | /* TRUE if generating a position independent executable. */ |
292 | unsigned int pie: 1; | |
293 | ||
294 | /* TRUE if generating an executable, position independent or not. */ | |
295 | unsigned int executable : 1; | |
296 | ||
9ee5e499 JJ |
297 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W|PF_X |
298 | flags. */ | |
299 | unsigned int execstack: 1; | |
300 | ||
301 | /* TRUE if PT_GNU_STACK segment should be created with PF_R|PF_W | |
302 | flags. */ | |
303 | unsigned int noexecstack: 1; | |
304 | ||
560e09e9 NC |
305 | /* What to do with unresolved symbols in an object file. |
306 | When producing static binaries the default is GENERATE_ERROR. | |
307 | When producing dynamic binaries the default is IGNORE. The | |
308 | assumption with dynamic binaries is that the reference will be | |
309 | resolved at load/execution time. */ | |
310 | enum report_method unresolved_syms_in_objects; | |
311 | ||
312 | /* What to do with unresolved symbols in a shared library. | |
313 | The same defaults apply. */ | |
314 | enum report_method unresolved_syms_in_shared_libs; | |
315 | ||
252b5132 RH |
316 | /* Which symbols to strip. */ |
317 | enum bfd_link_strip strip; | |
7815cf4f | 318 | |
252b5132 RH |
319 | /* Which local symbols to discard. */ |
320 | enum bfd_link_discard discard; | |
7815cf4f | 321 | |
cddd0089 AM |
322 | /* Criteria for skipping symbols when detemining |
323 | whether to include an object from an archive. */ | |
324 | enum bfd_link_common_skip_ar_aymbols common_skip_ar_aymbols; | |
7815cf4f | 325 | |
cddd0089 AM |
326 | /* Function callbacks. */ |
327 | const struct bfd_link_callbacks *callbacks; | |
7815cf4f | 328 | |
252b5132 RH |
329 | /* Hash table handled by BFD. */ |
330 | struct bfd_link_hash_table *hash; | |
7815cf4f | 331 | |
252b5132 RH |
332 | /* Hash table of symbols to keep. This is NULL unless strip is |
333 | strip_some. */ | |
334 | struct bfd_hash_table *keep_hash; | |
7815cf4f | 335 | |
252b5132 | 336 | /* Hash table of symbols to report back via the notice callback. If |
b34976b6 | 337 | this is NULL, and notice_all is FALSE, then no symbols are |
252b5132 RH |
338 | reported back. */ |
339 | struct bfd_hash_table *notice_hash; | |
7815cf4f | 340 | |
252b5132 RH |
341 | /* Hash table of symbols which are being wrapped (the --wrap linker |
342 | option). If this is NULL, no symbols are being wrapped. */ | |
343 | struct bfd_hash_table *wrap_hash; | |
7815cf4f | 344 | |
cddd0089 AM |
345 | /* The list of input BFD's involved in the link. These are chained |
346 | together via the link_next field. */ | |
347 | bfd *input_bfds; | |
348 | ||
349 | /* If a symbol should be created for each input BFD, this is section | |
350 | where those symbols should be placed. It must be a section in | |
351 | the output BFD. It may be NULL, in which case no such symbols | |
352 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
353 | linker command language. */ | |
354 | asection *create_object_symbols_section; | |
355 | ||
356 | /* List of global symbol names that are starting points for marking | |
357 | sections against garbage collection. */ | |
358 | struct bfd_sym_chain *gc_sym_list; | |
359 | ||
252b5132 | 360 | /* If a base output file is wanted, then this points to it */ |
8cf3f354 | 361 | void *base_file; |
252b5132 | 362 | |
94883c63 MM |
363 | /* The function to call when the executable or shared object is |
364 | loaded. */ | |
365 | const char *init_function; | |
7815cf4f | 366 | |
94883c63 MM |
367 | /* The function to call when the executable or shared object is |
368 | unloaded. */ | |
369 | const char *fini_function; | |
9bfcb6d6 | 370 | |
b34976b6 | 371 | /* Non-zero if auto-import thunks for DATA items in pei386 DLLs |
e0076ab3 NC |
372 | should be generated/linked against. Set to 1 if this feature |
373 | is explicitly requested by the user, -1 if enabled by default. */ | |
374 | int pei386_auto_import; | |
db6751f2 | 375 | |
2fa9fc65 NC |
376 | /* Non-zero if runtime relocs for DATA items with non-zero addends |
377 | in pei386 DLLs should be generated. Set to 1 if this feature | |
378 | is explicitly requested by the user, -1 if enabled by default. */ | |
379 | int pei386_runtime_pseudo_reloc; | |
380 | ||
db6751f2 | 381 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 382 | unsigned int spare_dynamic_tags; |
f7c33884 | 383 | |
cddd0089 AM |
384 | /* May be used to set DT_FLAGS for ELF. */ |
385 | bfd_vma flags; | |
386 | ||
387 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
388 | bfd_vma flags_1; | |
252b5132 RH |
389 | }; |
390 | ||
391 | /* This structures holds a set of callback functions. These are | |
392 | called by the BFD linker routines. The first argument to each | |
393 | callback function is the bfd_link_info structure being used. Each | |
b34976b6 | 394 | function returns a boolean value. If the function returns FALSE, |
252b5132 RH |
395 | then the BFD function which called it will return with a failure |
396 | indication. */ | |
397 | ||
398 | struct bfd_link_callbacks | |
399 | { | |
400 | /* A function which is called when an object is added from an | |
401 | archive. ABFD is the archive element being added. NAME is the | |
402 | name of the symbol which caused the archive element to be pulled | |
403 | in. */ | |
b34976b6 | 404 | bfd_boolean (*add_archive_element) |
8cf3f354 | 405 | (struct bfd_link_info *, bfd *abfd, const char *name); |
252b5132 RH |
406 | /* A function which is called when a symbol is found with multiple |
407 | definitions. NAME is the symbol which is defined multiple times. | |
408 | OBFD is the old BFD, OSEC is the old section, OVAL is the old | |
409 | value, NBFD is the new BFD, NSEC is the new section, and NVAL is | |
410 | the new value. OBFD may be NULL. OSEC and NSEC may be | |
411 | bfd_com_section or bfd_ind_section. */ | |
b34976b6 | 412 | bfd_boolean (*multiple_definition) |
8cf3f354 AM |
413 | (struct bfd_link_info *, const char *name, |
414 | bfd *obfd, asection *osec, bfd_vma oval, | |
415 | bfd *nbfd, asection *nsec, bfd_vma nval); | |
252b5132 RH |
416 | /* A function which is called when a common symbol is defined |
417 | multiple times. NAME is the symbol appearing multiple times. | |
418 | OBFD is the BFD of the existing symbol; it may be NULL if this is | |
419 | not known. OTYPE is the type of the existing symbol, which may | |
420 | be bfd_link_hash_defined, bfd_link_hash_defweak, | |
421 | bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is | |
422 | bfd_link_hash_common, OSIZE is the size of the existing symbol. | |
423 | NBFD is the BFD of the new symbol. NTYPE is the type of the new | |
424 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
425 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
426 | is the size of the new symbol. */ | |
b34976b6 | 427 | bfd_boolean (*multiple_common) |
8cf3f354 AM |
428 | (struct bfd_link_info *, const char *name, |
429 | bfd *obfd, enum bfd_link_hash_type otype, bfd_vma osize, | |
430 | bfd *nbfd, enum bfd_link_hash_type ntype, bfd_vma nsize); | |
252b5132 RH |
431 | /* A function which is called to add a symbol to a set. ENTRY is |
432 | the link hash table entry for the set itself (e.g., | |
433 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
1049f94e | 434 | the set when generating a relocatable file, and is also used to |
252b5132 RH |
435 | get the size of the entry when generating an executable file. |
436 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
b34976b6 | 437 | bfd_boolean (*add_to_set) |
8cf3f354 AM |
438 | (struct bfd_link_info *, struct bfd_link_hash_entry *entry, |
439 | bfd_reloc_code_real_type reloc, bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
440 | /* A function which is called when the name of a g++ constructor or |
441 | destructor is found. This is only called by some object file | |
b34976b6 | 442 | formats. CONSTRUCTOR is TRUE for a constructor, FALSE for a |
252b5132 | 443 | destructor. This will use BFD_RELOC_CTOR when generating a |
1049f94e | 444 | relocatable file. NAME is the name of the symbol found. ABFD, |
252b5132 | 445 | SECTION and VALUE are the value of the symbol. */ |
b34976b6 | 446 | bfd_boolean (*constructor) |
8cf3f354 AM |
447 | (struct bfd_link_info *, bfd_boolean constructor, const char *name, |
448 | bfd *abfd, asection *sec, bfd_vma value); | |
252b5132 RH |
449 | /* A function which is called to issue a linker warning. For |
450 | example, this is called when there is a reference to a warning | |
451 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
452 | of the symbol which triggered the warning; it may be NULL if | |
453 | there is none. ABFD, SECTION and ADDRESS identify the location | |
454 | which trigerred the warning; either ABFD or SECTION or both may | |
455 | be NULL if the location is not known. */ | |
b34976b6 | 456 | bfd_boolean (*warning) |
8cf3f354 AM |
457 | (struct bfd_link_info *, const char *warning, const char *symbol, |
458 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
459 | /* A function which is called when a relocation is attempted against |
460 | an undefined symbol. NAME is the symbol which is undefined. | |
461 | ABFD, SECTION and ADDRESS identify the location from which the | |
c086cbc6 L |
462 | reference is made. FATAL indicates whether an undefined symbol is |
463 | a fatal error or not. In some cases SECTION may be NULL. */ | |
b34976b6 | 464 | bfd_boolean (*undefined_symbol) |
8cf3f354 AM |
465 | (struct bfd_link_info *, const char *name, bfd *abfd, |
466 | asection *section, bfd_vma address, bfd_boolean fatal); | |
252b5132 RH |
467 | /* A function which is called when a reloc overflow occurs. NAME is |
468 | the name of the symbol or section the reloc is against, | |
469 | RELOC_NAME is the name of the relocation, and ADDEND is any | |
470 | addend that is used. ABFD, SECTION and ADDRESS identify the | |
471 | location at which the overflow occurs; if this is the result of a | |
472 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
473 | ABFD will be NULL. */ | |
b34976b6 | 474 | bfd_boolean (*reloc_overflow) |
8cf3f354 AM |
475 | (struct bfd_link_info *, const char *name, const char *reloc_name, |
476 | bfd_vma addend, bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
477 | /* A function which is called when a dangerous reloc is performed. |
478 | The canonical example is an a29k IHCONST reloc which does not | |
479 | follow an IHIHALF reloc. MESSAGE is an appropriate message. | |
480 | ABFD, SECTION and ADDRESS identify the location at which the | |
481 | problem occurred; if this is the result of a | |
482 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
483 | ABFD will be NULL. */ | |
b34976b6 | 484 | bfd_boolean (*reloc_dangerous) |
8cf3f354 AM |
485 | (struct bfd_link_info *, const char *message, |
486 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
487 | /* A function which is called when a reloc is found to be attached |
488 | to a symbol which is not being written out. NAME is the name of | |
489 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
490 | the reloc; if this is the result of a | |
491 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
492 | ABFD will be NULL. */ | |
b34976b6 | 493 | bfd_boolean (*unattached_reloc) |
8cf3f354 AM |
494 | (struct bfd_link_info *, const char *name, |
495 | bfd *abfd, asection *section, bfd_vma address); | |
252b5132 RH |
496 | /* A function which is called when a symbol in notice_hash is |
497 | defined or referenced. NAME is the symbol. ABFD, SECTION and | |
498 | ADDRESS are the value of the symbol. If SECTION is | |
499 | bfd_und_section, this is a reference. */ | |
b34976b6 | 500 | bfd_boolean (*notice) |
8cf3f354 AM |
501 | (struct bfd_link_info *, const char *name, |
502 | bfd *abfd, asection *section, bfd_vma address); | |
0f0569c4 L |
503 | /* A function which is called for reporting a linker error. ID is the |
504 | error identifier. The remaining input is the same as einfo () in | |
505 | ld. */ | |
506 | bfd_boolean (*error_handler) | |
8cf3f354 | 507 | (int id, const char *fmt, ...); |
6f6f27f8 L |
508 | |
509 | /* Identifiers of linker error messages used by error_handler. */ | |
510 | #define LD_DEFINITION_IN_DISCARDED_SECTION 1 | |
252b5132 RH |
511 | }; |
512 | \f | |
513 | /* The linker builds link_order structures which tell the code how to | |
514 | include input data in the output file. */ | |
515 | ||
516 | /* These are the types of link_order structures. */ | |
517 | ||
518 | enum bfd_link_order_type | |
519 | { | |
520 | bfd_undefined_link_order, /* Undefined. */ | |
521 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
522 | bfd_data_link_order, /* Set to explicit data. */ |
523 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
524 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
525 | }; | |
526 | ||
527 | /* This is the link_order structure itself. These form a chain | |
528 | attached to the section whose contents they are describing. */ | |
529 | ||
b34976b6 | 530 | struct bfd_link_order |
252b5132 RH |
531 | { |
532 | /* Next link_order in chain. */ | |
533 | struct bfd_link_order *next; | |
534 | /* Type of link_order. */ | |
535 | enum bfd_link_order_type type; | |
536 | /* Offset within output section. */ | |
b34976b6 | 537 | bfd_vma offset; |
252b5132 RH |
538 | /* Size within output section. */ |
539 | bfd_size_type size; | |
540 | /* Type specific information. */ | |
b34976b6 | 541 | union |
252b5132 | 542 | { |
b34976b6 | 543 | struct |
252b5132 RH |
544 | { |
545 | /* Section to include. If this is used, then | |
546 | section->output_section must be the section the | |
547 | link_order is attached to, section->output_offset must | |
548 | equal the link_order offset field, and section->_raw_size | |
549 | must equal the link_order size field. Maybe these | |
550 | restrictions should be relaxed someday. */ | |
551 | asection *section; | |
552 | } indirect; | |
553 | struct | |
554 | { | |
9a1b9f82 AM |
555 | /* Size of contents, or zero when contents size == size |
556 | within output section. | |
557 | A non-zero value allows filling of the output section | |
558 | with an arbitrary repeated pattern. */ | |
559 | unsigned int size; | |
560 | /* Data to put into file. */ | |
252b5132 RH |
561 | bfd_byte *contents; |
562 | } data; | |
563 | struct | |
564 | { | |
565 | /* Description of reloc to generate. Used for | |
566 | bfd_section_reloc_link_order and | |
567 | bfd_symbol_reloc_link_order. */ | |
568 | struct bfd_link_order_reloc *p; | |
569 | } reloc; | |
570 | } u; | |
571 | }; | |
572 | ||
573 | /* A linker order of type bfd_section_reloc_link_order or | |
574 | bfd_symbol_reloc_link_order means to create a reloc against a | |
575 | section or symbol, respectively. This is used to implement -Ur to | |
576 | generate relocs for the constructor tables. The | |
577 | bfd_link_order_reloc structure describes the reloc that BFD should | |
578 | create. It is similar to a arelent, but I didn't use arelent | |
579 | because the linker does not know anything about most symbols, and | |
580 | any asymbol structure it creates will be partially meaningless. | |
581 | This information could logically be in the bfd_link_order struct, | |
582 | but I didn't want to waste the space since these types of relocs | |
583 | are relatively rare. */ | |
584 | ||
585 | struct bfd_link_order_reloc | |
586 | { | |
587 | /* Reloc type. */ | |
588 | bfd_reloc_code_real_type reloc; | |
589 | ||
590 | union | |
591 | { | |
592 | /* For type bfd_section_reloc_link_order, this is the section | |
593 | the reloc should be against. This must be a section in the | |
594 | output BFD, not any of the input BFDs. */ | |
595 | asection *section; | |
596 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
597 | symbol the reloc should be against. */ | |
598 | const char *name; | |
599 | } u; | |
600 | ||
601 | /* Addend to use. The object file should contain zero. The BFD | |
602 | backend is responsible for filling in the contents of the object | |
603 | file correctly. For some object file formats (e.g., COFF) the | |
604 | addend must be stored into in the object file, and for some | |
605 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
606 | bfd_vma addend; | |
607 | }; | |
608 | ||
609 | /* Allocate a new link_order for a section. */ | |
8cf3f354 | 610 | extern struct bfd_link_order *bfd_new_link_order (bfd *, asection *); |
252b5132 RH |
611 | |
612 | /* These structures are used to describe version information for the | |
613 | ELF linker. These structures could be manipulated entirely inside | |
614 | BFD, but it would be a pain. Instead, the regular linker sets up | |
615 | these structures, and then passes them into BFD. */ | |
616 | ||
108ba305 | 617 | /* Glob pattern for a version. */ |
252b5132 RH |
618 | |
619 | struct bfd_elf_version_expr | |
620 | { | |
108ba305 | 621 | /* Next glob pattern for this version. */ |
252b5132 | 622 | struct bfd_elf_version_expr *next; |
108ba305 | 623 | /* Glob pattern. */ |
252b5132 | 624 | const char *pattern; |
5e35cbc2 L |
625 | /* NULL for a glob pattern, otherwise a straight symbol. */ |
626 | const char *symbol; | |
31941635 | 627 | /* Defined by ".symver". */ |
108ba305 | 628 | unsigned int symver : 1; |
31941635 L |
629 | /* Defined by version script. */ |
630 | unsigned int script : 1; | |
108ba305 JJ |
631 | /* Pattern type. */ |
632 | #define BFD_ELF_VERSION_C_TYPE 1 | |
633 | #define BFD_ELF_VERSION_CXX_TYPE 2 | |
634 | #define BFD_ELF_VERSION_JAVA_TYPE 4 | |
635 | unsigned int mask : 3; | |
636 | }; | |
637 | ||
638 | struct bfd_elf_version_expr_head | |
639 | { | |
640 | /* List of all patterns, both wildcards and non-wildcards. */ | |
641 | struct bfd_elf_version_expr *list; | |
642 | /* Hash table for non-wildcards. */ | |
643 | void *htab; | |
644 | /* Remaining patterns. */ | |
645 | struct bfd_elf_version_expr *remaining; | |
646 | /* What kind of pattern types are present in list (bitmask). */ | |
647 | unsigned int mask; | |
252b5132 RH |
648 | }; |
649 | ||
650 | /* Version dependencies. */ | |
651 | ||
652 | struct bfd_elf_version_deps | |
653 | { | |
654 | /* Next dependency for this version. */ | |
655 | struct bfd_elf_version_deps *next; | |
656 | /* The version which this version depends upon. */ | |
657 | struct bfd_elf_version_tree *version_needed; | |
658 | }; | |
659 | ||
660 | /* A node in the version tree. */ | |
661 | ||
662 | struct bfd_elf_version_tree | |
663 | { | |
664 | /* Next version. */ | |
665 | struct bfd_elf_version_tree *next; | |
666 | /* Name of this version. */ | |
667 | const char *name; | |
668 | /* Version number. */ | |
669 | unsigned int vernum; | |
670 | /* Regular expressions for global symbols in this version. */ | |
108ba305 | 671 | struct bfd_elf_version_expr_head globals; |
252b5132 | 672 | /* Regular expressions for local symbols in this version. */ |
108ba305 | 673 | struct bfd_elf_version_expr_head locals; |
252b5132 RH |
674 | /* List of versions which this version depends upon. */ |
675 | struct bfd_elf_version_deps *deps; | |
676 | /* Index of the version name. This is used within BFD. */ | |
677 | unsigned int name_indx; | |
678 | /* Whether this version tree was used. This is used within BFD. */ | |
679 | int used; | |
108ba305 JJ |
680 | /* Matching hook. */ |
681 | struct bfd_elf_version_expr *(*match) | |
682 | (struct bfd_elf_version_expr_head *head, | |
683 | struct bfd_elf_version_expr *prev, const char *sym); | |
252b5132 RH |
684 | }; |
685 | ||
686 | #endif |