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252b5132 | 1 | /* bfdlink.h -- header file for BFD link routines |
9a1b9f82 | 2 | Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2002 |
4f1d9bd8 | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | Written by Steve Chamberlain and Ian Lance Taylor, Cygnus Support. |
5 | ||
6 | This file is part of BFD, the Binary File Descriptor library. | |
7 | ||
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. | |
12 | ||
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. | |
17 | ||
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. */ | |
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 | ||
69 | /* The linking routines use a hash table which uses this structure for | |
70 | its elements. */ | |
71 | ||
72 | struct bfd_link_hash_entry | |
73 | { | |
74 | /* Base hash table entry structure. */ | |
75 | struct bfd_hash_entry root; | |
76 | /* Type of this entry. */ | |
77 | enum bfd_link_hash_type type; | |
78 | ||
79 | /* Undefined and common symbols are kept in a linked list through | |
80 | this field. This field is not in the union because that would | |
81 | force us to remove entries from the list when we changed their | |
82 | type, which would force the list to be doubly linked, which would | |
83 | waste more memory. When an undefined or common symbol is | |
84 | created, it should be added to this list, the head of which is in | |
85 | the link hash table itself. As symbols are defined, they need | |
86 | not be removed from the list; anything which reads the list must | |
87 | doublecheck the symbol type. | |
88 | ||
89 | Weak symbols are not kept on this list. | |
90 | ||
91 | Defined and defweak symbols use this field as a reference marker. | |
92 | If the field is not NULL, or this structure is the tail of the | |
93 | undefined symbol list, the symbol has been referenced. If the | |
94 | symbol is undefined and becomes defined, this field will | |
95 | automatically be non-NULL since the symbol will have been on the | |
96 | undefined symbol list. */ | |
97 | struct bfd_link_hash_entry *next; | |
98 | /* A union of information depending upon the type. */ | |
99 | union | |
100 | { | |
101 | /* Nothing is kept for bfd_hash_new. */ | |
102 | /* bfd_link_hash_undefined, bfd_link_hash_undefweak. */ | |
103 | struct | |
104 | { | |
105 | bfd *abfd; /* BFD symbol was found in. */ | |
106 | } undef; | |
107 | /* bfd_link_hash_defined, bfd_link_hash_defweak. */ | |
108 | struct | |
109 | { | |
110 | bfd_vma value; /* Symbol value. */ | |
111 | asection *section; /* Symbol section. */ | |
112 | } def; | |
113 | /* bfd_link_hash_indirect, bfd_link_hash_warning. */ | |
114 | struct | |
115 | { | |
116 | struct bfd_link_hash_entry *link; /* Real symbol. */ | |
117 | const char *warning; /* Warning (bfd_link_hash_warning only). */ | |
118 | } i; | |
119 | /* bfd_link_hash_common. */ | |
120 | struct | |
121 | { | |
122 | /* The linker needs to know three things about common | |
123 | symbols: the size, the alignment, and the section in | |
124 | which the symbol should be placed. We store the size | |
125 | here, and we allocate a small structure to hold the | |
126 | section and the alignment. The alignment is stored as a | |
127 | power of two. We don't store all the information | |
128 | directly because we don't want to increase the size of | |
129 | the union; this structure is a major space user in the | |
130 | linker. */ | |
131 | bfd_size_type size; /* Common symbol size. */ | |
132 | struct bfd_link_hash_common_entry | |
133 | { | |
134 | unsigned int alignment_power; /* Alignment. */ | |
135 | asection *section; /* Symbol section. */ | |
136 | } *p; | |
137 | } c; | |
138 | } u; | |
139 | }; | |
140 | ||
141 | /* This is the link hash table. It is a derived class of | |
142 | bfd_hash_table. */ | |
143 | ||
144 | struct bfd_link_hash_table | |
145 | { | |
146 | /* The hash table itself. */ | |
147 | struct bfd_hash_table table; | |
148 | /* The back end which created this hash table. This indicates the | |
149 | type of the entries in the hash table, which is sometimes | |
150 | important information when linking object files of different | |
151 | types together. */ | |
152 | const bfd_target *creator; | |
153 | /* A linked list of undefined and common symbols, linked through the | |
154 | next field in the bfd_link_hash_entry structure. */ | |
155 | struct bfd_link_hash_entry *undefs; | |
156 | /* Entries are added to the tail of the undefs list. */ | |
157 | struct bfd_link_hash_entry *undefs_tail; | |
8ea2e4bd NC |
158 | /* The type of the ink hash table. */ |
159 | enum bfd_link_hash_table_type type; | |
252b5132 RH |
160 | }; |
161 | ||
162 | /* Look up an entry in a link hash table. If FOLLOW is true, this | |
163 | follows bfd_link_hash_indirect and bfd_link_hash_warning links to | |
164 | the real symbol. */ | |
165 | extern struct bfd_link_hash_entry *bfd_link_hash_lookup | |
166 | PARAMS ((struct bfd_link_hash_table *, const char *, boolean create, | |
167 | boolean copy, boolean follow)); | |
168 | ||
169 | /* Look up an entry in the main linker hash table if the symbol might | |
170 | be wrapped. This should only be used for references to an | |
171 | undefined symbol, not for definitions of a symbol. */ | |
172 | ||
173 | extern struct bfd_link_hash_entry *bfd_wrapped_link_hash_lookup | |
174 | PARAMS ((bfd *, struct bfd_link_info *, const char *, boolean, boolean, | |
175 | boolean)); | |
176 | ||
177 | /* Traverse a link hash table. */ | |
178 | extern void bfd_link_hash_traverse | |
179 | PARAMS ((struct bfd_link_hash_table *, | |
180 | boolean (*) (struct bfd_link_hash_entry *, PTR), | |
181 | PTR)); | |
182 | ||
183 | /* Add an entry to the undefs list. */ | |
184 | extern void bfd_link_add_undef | |
185 | PARAMS ((struct bfd_link_hash_table *, struct bfd_link_hash_entry *)); | |
186 | \f | |
187 | /* This structure holds all the information needed to communicate | |
188 | between BFD and the linker when doing a link. */ | |
189 | ||
190 | struct bfd_link_info | |
191 | { | |
192 | /* Function callbacks. */ | |
193 | const struct bfd_link_callbacks *callbacks; | |
194 | /* true if BFD should generate a relocateable object file. */ | |
195 | boolean relocateable; | |
a712da20 NC |
196 | /* true if BFD should generate relocation information in the final executable. */ |
197 | boolean emitrelocations; | |
252b5132 RH |
198 | /* true if BFD should generate a "task linked" object file, |
199 | similar to relocatable but also with globals converted to statics. */ | |
200 | boolean task_link; | |
201 | /* true if BFD should generate a shared object. */ | |
202 | boolean shared; | |
203 | /* true if BFD should pre-bind symbols in a shared object. */ | |
204 | boolean symbolic; | |
7be4069c HPN |
205 | /* true if BFD should export all symbols in the dynamic symbol table |
206 | of an executable, rather than only those used. */ | |
207 | boolean export_dynamic; | |
252b5132 RH |
208 | /* true if shared objects should be linked directly, not shared. */ |
209 | boolean static_link; | |
210 | /* true if the output file should be in a traditional format. This | |
211 | is equivalent to the setting of the BFD_TRADITIONAL_FORMAT flag | |
212 | on the output file, but may be checked when reading the input | |
213 | files. */ | |
214 | boolean traditional_format; | |
215 | /* true if we want to produced optimized output files. This might | |
216 | need much more time and therefore must be explicitly selected. */ | |
217 | boolean optimize; | |
218 | /* true if BFD should generate errors for undefined symbols | |
219 | even if generating a shared object. */ | |
220 | boolean no_undefined; | |
b79e8c78 NC |
221 | /* true if BFD should allow undefined symbols in shared objects even |
222 | when no_undefined is set to disallow undefined symbols. The net | |
223 | result will be that undefined symbols in regular objects will | |
224 | still trigger an error, but undefined symbols in shared objects | |
225 | will be ignored. The implementation of no_undefined makes the | |
226 | assumption that the runtime linker will choke on undefined | |
227 | symbols. However there is at least one system (BeOS) where | |
228 | undefined symbols in shared libraries is normal since the kernel | |
229 | patches them at load time to select which function is most | |
230 | appropriate for the current architecture. I.E. dynamically | |
231 | select an appropriate memset function. Apparently it is also | |
232 | normal for HPPA shared libraries to have undefined symbols. */ | |
233 | boolean allow_shlib_undefined; | |
6713542f L |
234 | /* True if ok to have multiple definition. */ |
235 | boolean allow_multiple_definition; | |
252b5132 RH |
236 | /* Which symbols to strip. */ |
237 | enum bfd_link_strip strip; | |
238 | /* Which local symbols to discard. */ | |
239 | enum bfd_link_discard discard; | |
240 | /* true if symbols should be retained in memory, false if they | |
241 | should be freed and reread. */ | |
242 | boolean keep_memory; | |
243 | /* The list of input BFD's involved in the link. These are chained | |
244 | together via the link_next field. */ | |
245 | bfd *input_bfds; | |
246 | /* If a symbol should be created for each input BFD, this is section | |
247 | where those symbols should be placed. It must be a section in | |
248 | the output BFD. It may be NULL, in which case no such symbols | |
249 | will be created. This is to support CREATE_OBJECT_SYMBOLS in the | |
250 | linker command language. */ | |
251 | asection *create_object_symbols_section; | |
252 | /* Hash table handled by BFD. */ | |
253 | struct bfd_link_hash_table *hash; | |
254 | /* Hash table of symbols to keep. This is NULL unless strip is | |
255 | strip_some. */ | |
256 | struct bfd_hash_table *keep_hash; | |
257 | /* true if every symbol should be reported back via the notice | |
258 | callback. */ | |
259 | boolean notice_all; | |
260 | /* Hash table of symbols to report back via the notice callback. If | |
261 | this is NULL, and notice_all is false, then no symbols are | |
262 | reported back. */ | |
263 | struct bfd_hash_table *notice_hash; | |
264 | /* Hash table of symbols which are being wrapped (the --wrap linker | |
265 | option). If this is NULL, no symbols are being wrapped. */ | |
266 | struct bfd_hash_table *wrap_hash; | |
267 | /* If a base output file is wanted, then this points to it */ | |
268 | PTR base_file; | |
269 | ||
270 | /* If non-zero, specifies that branches which are problematic for the | |
271 | MPC860 C0 (or earlier) should be checked for and modified. It gives the | |
272 | number of bytes that should be checked at the end of each text page. */ | |
273 | int mpc860c0; | |
94883c63 MM |
274 | |
275 | /* The function to call when the executable or shared object is | |
276 | loaded. */ | |
277 | const char *init_function; | |
278 | /* The function to call when the executable or shared object is | |
279 | unloaded. */ | |
280 | const char *fini_function; | |
9bfcb6d6 | 281 | |
eec8c321 L |
282 | /* true if the new ELF dynamic tags are enabled. */ |
283 | boolean new_dtags; | |
284 | ||
9bfcb6d6 L |
285 | /* May be used to set DT_FLAGS for ELF. */ |
286 | bfd_vma flags; | |
287 | ||
288 | /* May be used to set DT_FLAGS_1 for ELF. */ | |
289 | bfd_vma flags_1; | |
3ede731b | 290 | |
db6751f2 | 291 | /* True if auto-import thunks for DATA items in pei386 DLLs |
3ede731b CW |
292 | should be generated/linked against. */ |
293 | boolean pei386_auto_import; | |
db6751f2 JJ |
294 | |
295 | /* True if non-PLT relocs should be merged into one reloc section | |
296 | and sorted so that relocs against the same symbol come together. */ | |
297 | boolean combreloc; | |
298 | ||
8bd621d8 AM |
299 | /* True if executable should not contain copy relocs. |
300 | Setting this true may result in a non-sharable text segment. */ | |
301 | boolean nocopyreloc; | |
302 | ||
65765700 JJ |
303 | /* True if .eh_frame_hdr section and PT_GNU_EH_FRAME ELF segment |
304 | should be created. */ | |
305 | boolean eh_frame_hdr; | |
306 | ||
db6751f2 | 307 | /* How many spare .dynamic DT_NULL entries should be added? */ |
b7781dbe | 308 | unsigned int spare_dynamic_tags; |
252b5132 RH |
309 | }; |
310 | ||
311 | /* This structures holds a set of callback functions. These are | |
312 | called by the BFD linker routines. The first argument to each | |
313 | callback function is the bfd_link_info structure being used. Each | |
314 | function returns a boolean value. If the function returns false, | |
315 | then the BFD function which called it will return with a failure | |
316 | indication. */ | |
317 | ||
318 | struct bfd_link_callbacks | |
319 | { | |
320 | /* A function which is called when an object is added from an | |
321 | archive. ABFD is the archive element being added. NAME is the | |
322 | name of the symbol which caused the archive element to be pulled | |
323 | in. */ | |
324 | boolean (*add_archive_element) PARAMS ((struct bfd_link_info *, | |
325 | bfd *abfd, | |
326 | const char *name)); | |
327 | /* A function which is called when a symbol is found with multiple | |
328 | definitions. NAME is the symbol which is defined multiple times. | |
329 | OBFD is the old BFD, OSEC is the old section, OVAL is the old | |
330 | value, NBFD is the new BFD, NSEC is the new section, and NVAL is | |
331 | the new value. OBFD may be NULL. OSEC and NSEC may be | |
332 | bfd_com_section or bfd_ind_section. */ | |
333 | boolean (*multiple_definition) PARAMS ((struct bfd_link_info *, | |
334 | const char *name, | |
335 | bfd *obfd, | |
336 | asection *osec, | |
337 | bfd_vma oval, | |
338 | bfd *nbfd, | |
339 | asection *nsec, | |
340 | bfd_vma nval)); | |
341 | /* A function which is called when a common symbol is defined | |
342 | multiple times. NAME is the symbol appearing multiple times. | |
343 | OBFD is the BFD of the existing symbol; it may be NULL if this is | |
344 | not known. OTYPE is the type of the existing symbol, which may | |
345 | be bfd_link_hash_defined, bfd_link_hash_defweak, | |
346 | bfd_link_hash_common, or bfd_link_hash_indirect. If OTYPE is | |
347 | bfd_link_hash_common, OSIZE is the size of the existing symbol. | |
348 | NBFD is the BFD of the new symbol. NTYPE is the type of the new | |
349 | symbol, one of bfd_link_hash_defined, bfd_link_hash_common, or | |
350 | bfd_link_hash_indirect. If NTYPE is bfd_link_hash_common, NSIZE | |
351 | is the size of the new symbol. */ | |
352 | boolean (*multiple_common) PARAMS ((struct bfd_link_info *, | |
353 | const char *name, | |
354 | bfd *obfd, | |
355 | enum bfd_link_hash_type otype, | |
356 | bfd_vma osize, | |
357 | bfd *nbfd, | |
358 | enum bfd_link_hash_type ntype, | |
359 | bfd_vma nsize)); | |
360 | /* A function which is called to add a symbol to a set. ENTRY is | |
361 | the link hash table entry for the set itself (e.g., | |
362 | __CTOR_LIST__). RELOC is the relocation to use for an entry in | |
363 | the set when generating a relocateable file, and is also used to | |
364 | get the size of the entry when generating an executable file. | |
365 | ABFD, SEC and VALUE identify the value to add to the set. */ | |
366 | boolean (*add_to_set) PARAMS ((struct bfd_link_info *, | |
367 | struct bfd_link_hash_entry *entry, | |
368 | bfd_reloc_code_real_type reloc, | |
369 | bfd *abfd, asection *sec, bfd_vma value)); | |
370 | /* A function which is called when the name of a g++ constructor or | |
371 | destructor is found. This is only called by some object file | |
372 | formats. CONSTRUCTOR is true for a constructor, false for a | |
373 | destructor. This will use BFD_RELOC_CTOR when generating a | |
374 | relocateable file. NAME is the name of the symbol found. ABFD, | |
375 | SECTION and VALUE are the value of the symbol. */ | |
376 | boolean (*constructor) PARAMS ((struct bfd_link_info *, | |
377 | boolean constructor, | |
378 | const char *name, bfd *abfd, asection *sec, | |
379 | bfd_vma value)); | |
380 | /* A function which is called to issue a linker warning. For | |
381 | example, this is called when there is a reference to a warning | |
382 | symbol. WARNING is the warning to be issued. SYMBOL is the name | |
383 | of the symbol which triggered the warning; it may be NULL if | |
384 | there is none. ABFD, SECTION and ADDRESS identify the location | |
385 | which trigerred the warning; either ABFD or SECTION or both may | |
386 | be NULL if the location is not known. */ | |
387 | boolean (*warning) PARAMS ((struct bfd_link_info *, | |
388 | const char *warning, const char *symbol, | |
389 | bfd *abfd, asection *section, | |
390 | bfd_vma address)); | |
391 | /* A function which is called when a relocation is attempted against | |
392 | an undefined symbol. NAME is the symbol which is undefined. | |
393 | ABFD, SECTION and ADDRESS identify the location from which the | |
c086cbc6 L |
394 | reference is made. FATAL indicates whether an undefined symbol is |
395 | a fatal error or not. In some cases SECTION may be NULL. */ | |
252b5132 RH |
396 | boolean (*undefined_symbol) PARAMS ((struct bfd_link_info *, |
397 | const char *name, bfd *abfd, | |
c086cbc6 L |
398 | asection *section, |
399 | bfd_vma address, | |
400 | boolean fatal)); | |
252b5132 RH |
401 | /* A function which is called when a reloc overflow occurs. NAME is |
402 | the name of the symbol or section the reloc is against, | |
403 | RELOC_NAME is the name of the relocation, and ADDEND is any | |
404 | addend that is used. ABFD, SECTION and ADDRESS identify the | |
405 | location at which the overflow occurs; if this is the result of a | |
406 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
407 | ABFD will be NULL. */ | |
408 | boolean (*reloc_overflow) PARAMS ((struct bfd_link_info *, | |
409 | const char *name, | |
410 | const char *reloc_name, bfd_vma addend, | |
411 | bfd *abfd, asection *section, | |
412 | bfd_vma address)); | |
413 | /* A function which is called when a dangerous reloc is performed. | |
414 | The canonical example is an a29k IHCONST reloc which does not | |
415 | follow an IHIHALF reloc. MESSAGE is an appropriate message. | |
416 | ABFD, SECTION and ADDRESS identify the location at which the | |
417 | problem occurred; if this is the result of a | |
418 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
419 | ABFD will be NULL. */ | |
420 | boolean (*reloc_dangerous) PARAMS ((struct bfd_link_info *, | |
421 | const char *message, | |
422 | bfd *abfd, asection *section, | |
423 | bfd_vma address)); | |
424 | /* A function which is called when a reloc is found to be attached | |
425 | to a symbol which is not being written out. NAME is the name of | |
426 | the symbol. ABFD, SECTION and ADDRESS identify the location of | |
427 | the reloc; if this is the result of a | |
428 | bfd_section_reloc_link_order or bfd_symbol_reloc_link_order, then | |
429 | ABFD will be NULL. */ | |
430 | boolean (*unattached_reloc) PARAMS ((struct bfd_link_info *, | |
431 | const char *name, | |
432 | bfd *abfd, asection *section, | |
433 | bfd_vma address)); | |
434 | /* A function which is called when a symbol in notice_hash is | |
435 | defined or referenced. NAME is the symbol. ABFD, SECTION and | |
436 | ADDRESS are the value of the symbol. If SECTION is | |
437 | bfd_und_section, this is a reference. */ | |
438 | boolean (*notice) PARAMS ((struct bfd_link_info *, const char *name, | |
439 | bfd *abfd, asection *section, bfd_vma address)); | |
440 | }; | |
441 | \f | |
442 | /* The linker builds link_order structures which tell the code how to | |
443 | include input data in the output file. */ | |
444 | ||
445 | /* These are the types of link_order structures. */ | |
446 | ||
447 | enum bfd_link_order_type | |
448 | { | |
449 | bfd_undefined_link_order, /* Undefined. */ | |
450 | bfd_indirect_link_order, /* Built from a section. */ | |
252b5132 RH |
451 | bfd_data_link_order, /* Set to explicit data. */ |
452 | bfd_section_reloc_link_order, /* Relocate against a section. */ | |
453 | bfd_symbol_reloc_link_order /* Relocate against a symbol. */ | |
454 | }; | |
455 | ||
456 | /* This is the link_order structure itself. These form a chain | |
457 | attached to the section whose contents they are describing. */ | |
458 | ||
459 | struct bfd_link_order | |
460 | { | |
461 | /* Next link_order in chain. */ | |
462 | struct bfd_link_order *next; | |
463 | /* Type of link_order. */ | |
464 | enum bfd_link_order_type type; | |
465 | /* Offset within output section. */ | |
466 | bfd_vma offset; | |
467 | /* Size within output section. */ | |
468 | bfd_size_type size; | |
469 | /* Type specific information. */ | |
470 | union | |
471 | { | |
472 | struct | |
473 | { | |
474 | /* Section to include. If this is used, then | |
475 | section->output_section must be the section the | |
476 | link_order is attached to, section->output_offset must | |
477 | equal the link_order offset field, and section->_raw_size | |
478 | must equal the link_order size field. Maybe these | |
479 | restrictions should be relaxed someday. */ | |
480 | asection *section; | |
481 | } indirect; | |
482 | struct | |
483 | { | |
9a1b9f82 AM |
484 | /* Size of contents, or zero when contents size == size |
485 | within output section. | |
486 | A non-zero value allows filling of the output section | |
487 | with an arbitrary repeated pattern. */ | |
488 | unsigned int size; | |
489 | /* Data to put into file. */ | |
252b5132 RH |
490 | bfd_byte *contents; |
491 | } data; | |
492 | struct | |
493 | { | |
494 | /* Description of reloc to generate. Used for | |
495 | bfd_section_reloc_link_order and | |
496 | bfd_symbol_reloc_link_order. */ | |
497 | struct bfd_link_order_reloc *p; | |
498 | } reloc; | |
499 | } u; | |
500 | }; | |
501 | ||
502 | /* A linker order of type bfd_section_reloc_link_order or | |
503 | bfd_symbol_reloc_link_order means to create a reloc against a | |
504 | section or symbol, respectively. This is used to implement -Ur to | |
505 | generate relocs for the constructor tables. The | |
506 | bfd_link_order_reloc structure describes the reloc that BFD should | |
507 | create. It is similar to a arelent, but I didn't use arelent | |
508 | because the linker does not know anything about most symbols, and | |
509 | any asymbol structure it creates will be partially meaningless. | |
510 | This information could logically be in the bfd_link_order struct, | |
511 | but I didn't want to waste the space since these types of relocs | |
512 | are relatively rare. */ | |
513 | ||
514 | struct bfd_link_order_reloc | |
515 | { | |
516 | /* Reloc type. */ | |
517 | bfd_reloc_code_real_type reloc; | |
518 | ||
519 | union | |
520 | { | |
521 | /* For type bfd_section_reloc_link_order, this is the section | |
522 | the reloc should be against. This must be a section in the | |
523 | output BFD, not any of the input BFDs. */ | |
524 | asection *section; | |
525 | /* For type bfd_symbol_reloc_link_order, this is the name of the | |
526 | symbol the reloc should be against. */ | |
527 | const char *name; | |
528 | } u; | |
529 | ||
530 | /* Addend to use. The object file should contain zero. The BFD | |
531 | backend is responsible for filling in the contents of the object | |
532 | file correctly. For some object file formats (e.g., COFF) the | |
533 | addend must be stored into in the object file, and for some | |
534 | (e.g., SPARC a.out) it is kept in the reloc. */ | |
535 | bfd_vma addend; | |
536 | }; | |
537 | ||
538 | /* Allocate a new link_order for a section. */ | |
539 | extern struct bfd_link_order *bfd_new_link_order PARAMS ((bfd *, asection *)); | |
540 | ||
541 | /* These structures are used to describe version information for the | |
542 | ELF linker. These structures could be manipulated entirely inside | |
543 | BFD, but it would be a pain. Instead, the regular linker sets up | |
544 | these structures, and then passes them into BFD. */ | |
545 | ||
546 | /* Regular expressions for a version. */ | |
547 | ||
548 | struct bfd_elf_version_expr | |
549 | { | |
550 | /* Next regular expression for this version. */ | |
551 | struct bfd_elf_version_expr *next; | |
552 | /* Regular expression. */ | |
553 | const char *pattern; | |
554 | /* Matching function. */ | |
555 | int (*match) PARAMS((struct bfd_elf_version_expr *, const char *)); | |
556 | }; | |
557 | ||
558 | /* Version dependencies. */ | |
559 | ||
560 | struct bfd_elf_version_deps | |
561 | { | |
562 | /* Next dependency for this version. */ | |
563 | struct bfd_elf_version_deps *next; | |
564 | /* The version which this version depends upon. */ | |
565 | struct bfd_elf_version_tree *version_needed; | |
566 | }; | |
567 | ||
568 | /* A node in the version tree. */ | |
569 | ||
570 | struct bfd_elf_version_tree | |
571 | { | |
572 | /* Next version. */ | |
573 | struct bfd_elf_version_tree *next; | |
574 | /* Name of this version. */ | |
575 | const char *name; | |
576 | /* Version number. */ | |
577 | unsigned int vernum; | |
578 | /* Regular expressions for global symbols in this version. */ | |
579 | struct bfd_elf_version_expr *globals; | |
580 | /* Regular expressions for local symbols in this version. */ | |
581 | struct bfd_elf_version_expr *locals; | |
582 | /* List of versions which this version depends upon. */ | |
583 | struct bfd_elf_version_deps *deps; | |
584 | /* Index of the version name. This is used within BFD. */ | |
585 | unsigned int name_indx; | |
586 | /* Whether this version tree was used. This is used within BFD. */ | |
587 | int used; | |
588 | }; | |
589 | ||
590 | #endif |