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252b5132 RH |
1 | /* ELF linker support. |
2 | Copyright 1995, 1996, 1997, 1998, 1999 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | /* ELF linker code. */ | |
21 | ||
22 | /* This struct is used to pass information to routines called via | |
23 | elf_link_hash_traverse which must return failure. */ | |
24 | ||
25 | struct elf_info_failed | |
26 | { | |
27 | boolean failed; | |
28 | struct bfd_link_info *info; | |
29 | }; | |
30 | ||
31 | static boolean elf_link_add_object_symbols | |
32 | PARAMS ((bfd *, struct bfd_link_info *)); | |
33 | static boolean elf_link_add_archive_symbols | |
34 | PARAMS ((bfd *, struct bfd_link_info *)); | |
35 | static boolean elf_merge_symbol | |
36 | PARAMS ((bfd *, struct bfd_link_info *, const char *, Elf_Internal_Sym *, | |
37 | asection **, bfd_vma *, struct elf_link_hash_entry **, | |
38 | boolean *, boolean *, boolean *)); | |
39 | static boolean elf_export_symbol | |
40 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
41 | static boolean elf_fix_symbol_flags | |
42 | PARAMS ((struct elf_link_hash_entry *, struct elf_info_failed *)); | |
43 | static boolean elf_adjust_dynamic_symbol | |
44 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
45 | static boolean elf_link_find_version_dependencies | |
46 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
47 | static boolean elf_link_find_version_dependencies | |
48 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
49 | static boolean elf_link_assign_sym_version | |
50 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
51 | static boolean elf_link_renumber_dynsyms | |
52 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
53 | static boolean elf_collect_hash_codes | |
54 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
6b5bd373 MM |
55 | static boolean elf_link_read_relocs_from_section |
56 | PARAMS ((bfd *, Elf_Internal_Shdr *, PTR, Elf_Internal_Rela *)); | |
252b5132 RH |
57 | |
58 | /* Given an ELF BFD, add symbols to the global hash table as | |
59 | appropriate. */ | |
60 | ||
61 | boolean | |
62 | elf_bfd_link_add_symbols (abfd, info) | |
63 | bfd *abfd; | |
64 | struct bfd_link_info *info; | |
65 | { | |
66 | switch (bfd_get_format (abfd)) | |
67 | { | |
68 | case bfd_object: | |
69 | return elf_link_add_object_symbols (abfd, info); | |
70 | case bfd_archive: | |
71 | return elf_link_add_archive_symbols (abfd, info); | |
72 | default: | |
73 | bfd_set_error (bfd_error_wrong_format); | |
74 | return false; | |
75 | } | |
76 | } | |
77 | \f | |
78 | ||
79 | /* Add symbols from an ELF archive file to the linker hash table. We | |
80 | don't use _bfd_generic_link_add_archive_symbols because of a | |
81 | problem which arises on UnixWare. The UnixWare libc.so is an | |
82 | archive which includes an entry libc.so.1 which defines a bunch of | |
83 | symbols. The libc.so archive also includes a number of other | |
84 | object files, which also define symbols, some of which are the same | |
85 | as those defined in libc.so.1. Correct linking requires that we | |
86 | consider each object file in turn, and include it if it defines any | |
87 | symbols we need. _bfd_generic_link_add_archive_symbols does not do | |
88 | this; it looks through the list of undefined symbols, and includes | |
89 | any object file which defines them. When this algorithm is used on | |
90 | UnixWare, it winds up pulling in libc.so.1 early and defining a | |
91 | bunch of symbols. This means that some of the other objects in the | |
92 | archive are not included in the link, which is incorrect since they | |
93 | precede libc.so.1 in the archive. | |
94 | ||
95 | Fortunately, ELF archive handling is simpler than that done by | |
96 | _bfd_generic_link_add_archive_symbols, which has to allow for a.out | |
97 | oddities. In ELF, if we find a symbol in the archive map, and the | |
98 | symbol is currently undefined, we know that we must pull in that | |
99 | object file. | |
100 | ||
101 | Unfortunately, we do have to make multiple passes over the symbol | |
102 | table until nothing further is resolved. */ | |
103 | ||
104 | static boolean | |
105 | elf_link_add_archive_symbols (abfd, info) | |
106 | bfd *abfd; | |
107 | struct bfd_link_info *info; | |
108 | { | |
109 | symindex c; | |
110 | boolean *defined = NULL; | |
111 | boolean *included = NULL; | |
112 | carsym *symdefs; | |
113 | boolean loop; | |
114 | ||
115 | if (! bfd_has_map (abfd)) | |
116 | { | |
117 | /* An empty archive is a special case. */ | |
118 | if (bfd_openr_next_archived_file (abfd, (bfd *) NULL) == NULL) | |
119 | return true; | |
120 | bfd_set_error (bfd_error_no_armap); | |
121 | return false; | |
122 | } | |
123 | ||
124 | /* Keep track of all symbols we know to be already defined, and all | |
125 | files we know to be already included. This is to speed up the | |
126 | second and subsequent passes. */ | |
127 | c = bfd_ardata (abfd)->symdef_count; | |
128 | if (c == 0) | |
129 | return true; | |
130 | defined = (boolean *) bfd_malloc (c * sizeof (boolean)); | |
131 | included = (boolean *) bfd_malloc (c * sizeof (boolean)); | |
132 | if (defined == (boolean *) NULL || included == (boolean *) NULL) | |
133 | goto error_return; | |
134 | memset (defined, 0, c * sizeof (boolean)); | |
135 | memset (included, 0, c * sizeof (boolean)); | |
136 | ||
137 | symdefs = bfd_ardata (abfd)->symdefs; | |
138 | ||
139 | do | |
140 | { | |
141 | file_ptr last; | |
142 | symindex i; | |
143 | carsym *symdef; | |
144 | carsym *symdefend; | |
145 | ||
146 | loop = false; | |
147 | last = -1; | |
148 | ||
149 | symdef = symdefs; | |
150 | symdefend = symdef + c; | |
151 | for (i = 0; symdef < symdefend; symdef++, i++) | |
152 | { | |
153 | struct elf_link_hash_entry *h; | |
154 | bfd *element; | |
155 | struct bfd_link_hash_entry *undefs_tail; | |
156 | symindex mark; | |
157 | ||
158 | if (defined[i] || included[i]) | |
159 | continue; | |
160 | if (symdef->file_offset == last) | |
161 | { | |
162 | included[i] = true; | |
163 | continue; | |
164 | } | |
165 | ||
166 | h = elf_link_hash_lookup (elf_hash_table (info), symdef->name, | |
167 | false, false, false); | |
168 | ||
169 | if (h == NULL) | |
170 | { | |
171 | char *p, *copy; | |
172 | ||
173 | /* If this is a default version (the name contains @@), | |
174 | look up the symbol again without the version. The | |
175 | effect is that references to the symbol without the | |
176 | version will be matched by the default symbol in the | |
177 | archive. */ | |
178 | ||
179 | p = strchr (symdef->name, ELF_VER_CHR); | |
180 | if (p == NULL || p[1] != ELF_VER_CHR) | |
181 | continue; | |
182 | ||
183 | copy = bfd_alloc (abfd, p - symdef->name + 1); | |
184 | if (copy == NULL) | |
185 | goto error_return; | |
186 | memcpy (copy, symdef->name, p - symdef->name); | |
187 | copy[p - symdef->name] = '\0'; | |
188 | ||
189 | h = elf_link_hash_lookup (elf_hash_table (info), copy, | |
190 | false, false, false); | |
191 | ||
192 | bfd_release (abfd, copy); | |
193 | } | |
194 | ||
195 | if (h == NULL) | |
196 | continue; | |
197 | ||
198 | if (h->root.type != bfd_link_hash_undefined) | |
199 | { | |
200 | if (h->root.type != bfd_link_hash_undefweak) | |
201 | defined[i] = true; | |
202 | continue; | |
203 | } | |
204 | ||
205 | /* We need to include this archive member. */ | |
206 | ||
207 | element = _bfd_get_elt_at_filepos (abfd, symdef->file_offset); | |
208 | if (element == (bfd *) NULL) | |
209 | goto error_return; | |
210 | ||
211 | if (! bfd_check_format (element, bfd_object)) | |
212 | goto error_return; | |
213 | ||
214 | /* Doublecheck that we have not included this object | |
215 | already--it should be impossible, but there may be | |
216 | something wrong with the archive. */ | |
217 | if (element->archive_pass != 0) | |
218 | { | |
219 | bfd_set_error (bfd_error_bad_value); | |
220 | goto error_return; | |
221 | } | |
222 | element->archive_pass = 1; | |
223 | ||
224 | undefs_tail = info->hash->undefs_tail; | |
225 | ||
226 | if (! (*info->callbacks->add_archive_element) (info, element, | |
227 | symdef->name)) | |
228 | goto error_return; | |
229 | if (! elf_link_add_object_symbols (element, info)) | |
230 | goto error_return; | |
231 | ||
232 | /* If there are any new undefined symbols, we need to make | |
233 | another pass through the archive in order to see whether | |
234 | they can be defined. FIXME: This isn't perfect, because | |
235 | common symbols wind up on undefs_tail and because an | |
236 | undefined symbol which is defined later on in this pass | |
237 | does not require another pass. This isn't a bug, but it | |
238 | does make the code less efficient than it could be. */ | |
239 | if (undefs_tail != info->hash->undefs_tail) | |
240 | loop = true; | |
241 | ||
242 | /* Look backward to mark all symbols from this object file | |
243 | which we have already seen in this pass. */ | |
244 | mark = i; | |
245 | do | |
246 | { | |
247 | included[mark] = true; | |
248 | if (mark == 0) | |
249 | break; | |
250 | --mark; | |
251 | } | |
252 | while (symdefs[mark].file_offset == symdef->file_offset); | |
253 | ||
254 | /* We mark subsequent symbols from this object file as we go | |
255 | on through the loop. */ | |
256 | last = symdef->file_offset; | |
257 | } | |
258 | } | |
259 | while (loop); | |
260 | ||
261 | free (defined); | |
262 | free (included); | |
263 | ||
264 | return true; | |
265 | ||
266 | error_return: | |
267 | if (defined != (boolean *) NULL) | |
268 | free (defined); | |
269 | if (included != (boolean *) NULL) | |
270 | free (included); | |
271 | return false; | |
272 | } | |
273 | ||
274 | /* This function is called when we want to define a new symbol. It | |
275 | handles the various cases which arise when we find a definition in | |
276 | a dynamic object, or when there is already a definition in a | |
277 | dynamic object. The new symbol is described by NAME, SYM, PSEC, | |
278 | and PVALUE. We set SYM_HASH to the hash table entry. We set | |
279 | OVERRIDE if the old symbol is overriding a new definition. We set | |
280 | TYPE_CHANGE_OK if it is OK for the type to change. We set | |
281 | SIZE_CHANGE_OK if it is OK for the size to change. By OK to | |
282 | change, we mean that we shouldn't warn if the type or size does | |
283 | change. */ | |
284 | ||
285 | static boolean | |
286 | elf_merge_symbol (abfd, info, name, sym, psec, pvalue, sym_hash, | |
287 | override, type_change_ok, size_change_ok) | |
288 | bfd *abfd; | |
289 | struct bfd_link_info *info; | |
290 | const char *name; | |
291 | Elf_Internal_Sym *sym; | |
292 | asection **psec; | |
293 | bfd_vma *pvalue; | |
294 | struct elf_link_hash_entry **sym_hash; | |
295 | boolean *override; | |
296 | boolean *type_change_ok; | |
297 | boolean *size_change_ok; | |
298 | { | |
299 | asection *sec; | |
300 | struct elf_link_hash_entry *h; | |
301 | int bind; | |
302 | bfd *oldbfd; | |
303 | boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon; | |
304 | ||
305 | *override = false; | |
306 | ||
307 | sec = *psec; | |
308 | bind = ELF_ST_BIND (sym->st_info); | |
309 | ||
310 | if (! bfd_is_und_section (sec)) | |
311 | h = elf_link_hash_lookup (elf_hash_table (info), name, true, false, false); | |
312 | else | |
313 | h = ((struct elf_link_hash_entry *) | |
314 | bfd_wrapped_link_hash_lookup (abfd, info, name, true, false, false)); | |
315 | if (h == NULL) | |
316 | return false; | |
317 | *sym_hash = h; | |
318 | ||
319 | /* This code is for coping with dynamic objects, and is only useful | |
320 | if we are doing an ELF link. */ | |
321 | if (info->hash->creator != abfd->xvec) | |
322 | return true; | |
323 | ||
324 | /* For merging, we only care about real symbols. */ | |
325 | ||
326 | while (h->root.type == bfd_link_hash_indirect | |
327 | || h->root.type == bfd_link_hash_warning) | |
328 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
329 | ||
330 | /* If we just created the symbol, mark it as being an ELF symbol. | |
331 | Other than that, there is nothing to do--there is no merge issue | |
332 | with a newly defined symbol--so we just return. */ | |
333 | ||
334 | if (h->root.type == bfd_link_hash_new) | |
335 | { | |
336 | h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF; | |
337 | return true; | |
338 | } | |
339 | ||
340 | /* OLDBFD is a BFD associated with the existing symbol. */ | |
341 | ||
342 | switch (h->root.type) | |
343 | { | |
344 | default: | |
345 | oldbfd = NULL; | |
346 | break; | |
347 | ||
348 | case bfd_link_hash_undefined: | |
349 | case bfd_link_hash_undefweak: | |
350 | oldbfd = h->root.u.undef.abfd; | |
351 | break; | |
352 | ||
353 | case bfd_link_hash_defined: | |
354 | case bfd_link_hash_defweak: | |
355 | oldbfd = h->root.u.def.section->owner; | |
356 | break; | |
357 | ||
358 | case bfd_link_hash_common: | |
359 | oldbfd = h->root.u.c.p->section->owner; | |
360 | break; | |
361 | } | |
362 | ||
363 | /* NEWDYN and OLDDYN indicate whether the new or old symbol, | |
364 | respectively, is from a dynamic object. */ | |
365 | ||
366 | if ((abfd->flags & DYNAMIC) != 0) | |
367 | newdyn = true; | |
368 | else | |
369 | newdyn = false; | |
370 | ||
371 | if (oldbfd == NULL || (oldbfd->flags & DYNAMIC) == 0) | |
372 | olddyn = false; | |
373 | else | |
374 | olddyn = true; | |
375 | ||
376 | /* NEWDEF and OLDDEF indicate whether the new or old symbol, | |
377 | respectively, appear to be a definition rather than reference. */ | |
378 | ||
379 | if (bfd_is_und_section (sec) || bfd_is_com_section (sec)) | |
380 | newdef = false; | |
381 | else | |
382 | newdef = true; | |
383 | ||
384 | if (h->root.type == bfd_link_hash_undefined | |
385 | || h->root.type == bfd_link_hash_undefweak | |
386 | || h->root.type == bfd_link_hash_common) | |
387 | olddef = false; | |
388 | else | |
389 | olddef = true; | |
390 | ||
391 | /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old | |
392 | symbol, respectively, appears to be a common symbol in a dynamic | |
393 | object. If a symbol appears in an uninitialized section, and is | |
394 | not weak, and is not a function, then it may be a common symbol | |
395 | which was resolved when the dynamic object was created. We want | |
396 | to treat such symbols specially, because they raise special | |
397 | considerations when setting the symbol size: if the symbol | |
398 | appears as a common symbol in a regular object, and the size in | |
399 | the regular object is larger, we must make sure that we use the | |
400 | larger size. This problematic case can always be avoided in C, | |
401 | but it must be handled correctly when using Fortran shared | |
402 | libraries. | |
403 | ||
404 | Note that if NEWDYNCOMMON is set, NEWDEF will be set, and | |
405 | likewise for OLDDYNCOMMON and OLDDEF. | |
406 | ||
407 | Note that this test is just a heuristic, and that it is quite | |
408 | possible to have an uninitialized symbol in a shared object which | |
409 | is really a definition, rather than a common symbol. This could | |
410 | lead to some minor confusion when the symbol really is a common | |
411 | symbol in some regular object. However, I think it will be | |
412 | harmless. */ | |
413 | ||
414 | if (newdyn | |
415 | && newdef | |
416 | && (sec->flags & SEC_ALLOC) != 0 | |
417 | && (sec->flags & SEC_LOAD) == 0 | |
418 | && sym->st_size > 0 | |
419 | && bind != STB_WEAK | |
420 | && ELF_ST_TYPE (sym->st_info) != STT_FUNC) | |
421 | newdyncommon = true; | |
422 | else | |
423 | newdyncommon = false; | |
424 | ||
425 | if (olddyn | |
426 | && olddef | |
427 | && h->root.type == bfd_link_hash_defined | |
428 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
429 | && (h->root.u.def.section->flags & SEC_ALLOC) != 0 | |
430 | && (h->root.u.def.section->flags & SEC_LOAD) == 0 | |
431 | && h->size > 0 | |
432 | && h->type != STT_FUNC) | |
433 | olddyncommon = true; | |
434 | else | |
435 | olddyncommon = false; | |
436 | ||
437 | /* It's OK to change the type if either the existing symbol or the | |
438 | new symbol is weak. */ | |
439 | ||
440 | if (h->root.type == bfd_link_hash_defweak | |
441 | || h->root.type == bfd_link_hash_undefweak | |
442 | || bind == STB_WEAK) | |
443 | *type_change_ok = true; | |
444 | ||
445 | /* It's OK to change the size if either the existing symbol or the | |
446 | new symbol is weak, or if the old symbol is undefined. */ | |
447 | ||
448 | if (*type_change_ok | |
449 | || h->root.type == bfd_link_hash_undefined) | |
450 | *size_change_ok = true; | |
451 | ||
452 | /* If both the old and the new symbols look like common symbols in a | |
453 | dynamic object, set the size of the symbol to the larger of the | |
454 | two. */ | |
455 | ||
456 | if (olddyncommon | |
457 | && newdyncommon | |
458 | && sym->st_size != h->size) | |
459 | { | |
460 | /* Since we think we have two common symbols, issue a multiple | |
461 | common warning if desired. Note that we only warn if the | |
462 | size is different. If the size is the same, we simply let | |
463 | the old symbol override the new one as normally happens with | |
464 | symbols defined in dynamic objects. */ | |
465 | ||
466 | if (! ((*info->callbacks->multiple_common) | |
467 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, | |
468 | h->size, abfd, bfd_link_hash_common, sym->st_size))) | |
469 | return false; | |
470 | ||
471 | if (sym->st_size > h->size) | |
472 | h->size = sym->st_size; | |
473 | ||
474 | *size_change_ok = true; | |
475 | } | |
476 | ||
477 | /* If we are looking at a dynamic object, and we have found a | |
478 | definition, we need to see if the symbol was already defined by | |
479 | some other object. If so, we want to use the existing | |
480 | definition, and we do not want to report a multiple symbol | |
481 | definition error; we do this by clobbering *PSEC to be | |
482 | bfd_und_section_ptr. | |
483 | ||
484 | We treat a common symbol as a definition if the symbol in the | |
485 | shared library is a function, since common symbols always | |
486 | represent variables; this can cause confusion in principle, but | |
487 | any such confusion would seem to indicate an erroneous program or | |
488 | shared library. We also permit a common symbol in a regular | |
489 | object to override a weak symbol in a shared object. */ | |
490 | ||
491 | if (newdyn | |
492 | && newdef | |
493 | && (olddef | |
494 | || (h->root.type == bfd_link_hash_common | |
495 | && (bind == STB_WEAK | |
496 | || ELF_ST_TYPE (sym->st_info) == STT_FUNC)))) | |
497 | { | |
498 | *override = true; | |
499 | newdef = false; | |
500 | newdyncommon = false; | |
501 | ||
502 | *psec = sec = bfd_und_section_ptr; | |
503 | *size_change_ok = true; | |
504 | ||
505 | /* If we get here when the old symbol is a common symbol, then | |
506 | we are explicitly letting it override a weak symbol or | |
507 | function in a dynamic object, and we don't want to warn about | |
508 | a type change. If the old symbol is a defined symbol, a type | |
509 | change warning may still be appropriate. */ | |
510 | ||
511 | if (h->root.type == bfd_link_hash_common) | |
512 | *type_change_ok = true; | |
513 | } | |
514 | ||
515 | /* Handle the special case of an old common symbol merging with a | |
516 | new symbol which looks like a common symbol in a shared object. | |
517 | We change *PSEC and *PVALUE to make the new symbol look like a | |
518 | common symbol, and let _bfd_generic_link_add_one_symbol will do | |
519 | the right thing. */ | |
520 | ||
521 | if (newdyncommon | |
522 | && h->root.type == bfd_link_hash_common) | |
523 | { | |
524 | *override = true; | |
525 | newdef = false; | |
526 | newdyncommon = false; | |
527 | *pvalue = sym->st_size; | |
528 | *psec = sec = bfd_com_section_ptr; | |
529 | *size_change_ok = true; | |
530 | } | |
531 | ||
532 | /* If the old symbol is from a dynamic object, and the new symbol is | |
533 | a definition which is not from a dynamic object, then the new | |
534 | symbol overrides the old symbol. Symbols from regular files | |
535 | always take precedence over symbols from dynamic objects, even if | |
536 | they are defined after the dynamic object in the link. | |
537 | ||
538 | As above, we again permit a common symbol in a regular object to | |
539 | override a definition in a shared object if the shared object | |
540 | symbol is a function or is weak. */ | |
541 | ||
542 | if (! newdyn | |
543 | && (newdef | |
544 | || (bfd_is_com_section (sec) | |
545 | && (h->root.type == bfd_link_hash_defweak | |
546 | || h->type == STT_FUNC))) | |
547 | && olddyn | |
548 | && olddef | |
549 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0) | |
550 | { | |
551 | /* Change the hash table entry to undefined, and let | |
552 | _bfd_generic_link_add_one_symbol do the right thing with the | |
553 | new definition. */ | |
554 | ||
555 | h->root.type = bfd_link_hash_undefined; | |
556 | h->root.u.undef.abfd = h->root.u.def.section->owner; | |
557 | *size_change_ok = true; | |
558 | ||
559 | olddef = false; | |
560 | olddyncommon = false; | |
561 | ||
562 | /* We again permit a type change when a common symbol may be | |
563 | overriding a function. */ | |
564 | ||
565 | if (bfd_is_com_section (sec)) | |
566 | *type_change_ok = true; | |
567 | ||
568 | /* This union may have been set to be non-NULL when this symbol | |
569 | was seen in a dynamic object. We must force the union to be | |
570 | NULL, so that it is correct for a regular symbol. */ | |
571 | ||
572 | h->verinfo.vertree = NULL; | |
573 | ||
574 | /* In this special case, if H is the target of an indirection, | |
575 | we want the caller to frob with H rather than with the | |
576 | indirect symbol. That will permit the caller to redefine the | |
577 | target of the indirection, rather than the indirect symbol | |
578 | itself. FIXME: This will break the -y option if we store a | |
579 | symbol with a different name. */ | |
580 | *sym_hash = h; | |
581 | } | |
582 | ||
583 | /* Handle the special case of a new common symbol merging with an | |
584 | old symbol that looks like it might be a common symbol defined in | |
585 | a shared object. Note that we have already handled the case in | |
586 | which a new common symbol should simply override the definition | |
587 | in the shared library. */ | |
588 | ||
589 | if (! newdyn | |
590 | && bfd_is_com_section (sec) | |
591 | && olddyncommon) | |
592 | { | |
593 | /* It would be best if we could set the hash table entry to a | |
594 | common symbol, but we don't know what to use for the section | |
595 | or the alignment. */ | |
596 | if (! ((*info->callbacks->multiple_common) | |
597 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, | |
598 | h->size, abfd, bfd_link_hash_common, sym->st_size))) | |
599 | return false; | |
600 | ||
601 | /* If the predumed common symbol in the dynamic object is | |
602 | larger, pretend that the new symbol has its size. */ | |
603 | ||
604 | if (h->size > *pvalue) | |
605 | *pvalue = h->size; | |
606 | ||
607 | /* FIXME: We no longer know the alignment required by the symbol | |
608 | in the dynamic object, so we just wind up using the one from | |
609 | the regular object. */ | |
610 | ||
611 | olddef = false; | |
612 | olddyncommon = false; | |
613 | ||
614 | h->root.type = bfd_link_hash_undefined; | |
615 | h->root.u.undef.abfd = h->root.u.def.section->owner; | |
616 | ||
617 | *size_change_ok = true; | |
618 | *type_change_ok = true; | |
619 | ||
620 | h->verinfo.vertree = NULL; | |
621 | } | |
622 | ||
623 | return true; | |
624 | } | |
625 | ||
626 | /* Add symbols from an ELF object file to the linker hash table. */ | |
627 | ||
628 | static boolean | |
629 | elf_link_add_object_symbols (abfd, info) | |
630 | bfd *abfd; | |
631 | struct bfd_link_info *info; | |
632 | { | |
633 | boolean (*add_symbol_hook) PARAMS ((bfd *, struct bfd_link_info *, | |
634 | const Elf_Internal_Sym *, | |
635 | const char **, flagword *, | |
636 | asection **, bfd_vma *)); | |
637 | boolean (*check_relocs) PARAMS ((bfd *, struct bfd_link_info *, | |
638 | asection *, const Elf_Internal_Rela *)); | |
639 | boolean collect; | |
640 | Elf_Internal_Shdr *hdr; | |
641 | size_t symcount; | |
642 | size_t extsymcount; | |
643 | size_t extsymoff; | |
644 | Elf_External_Sym *buf = NULL; | |
645 | struct elf_link_hash_entry **sym_hash; | |
646 | boolean dynamic; | |
647 | bfd_byte *dynver = NULL; | |
648 | Elf_External_Versym *extversym = NULL; | |
649 | Elf_External_Versym *ever; | |
650 | Elf_External_Dyn *dynbuf = NULL; | |
651 | struct elf_link_hash_entry *weaks; | |
652 | Elf_External_Sym *esym; | |
653 | Elf_External_Sym *esymend; | |
654 | ||
655 | add_symbol_hook = get_elf_backend_data (abfd)->elf_add_symbol_hook; | |
656 | collect = get_elf_backend_data (abfd)->collect; | |
657 | ||
658 | if ((abfd->flags & DYNAMIC) == 0) | |
659 | dynamic = false; | |
660 | else | |
661 | { | |
662 | dynamic = true; | |
663 | ||
664 | /* You can't use -r against a dynamic object. Also, there's no | |
665 | hope of using a dynamic object which does not exactly match | |
666 | the format of the output file. */ | |
667 | if (info->relocateable || info->hash->creator != abfd->xvec) | |
668 | { | |
669 | bfd_set_error (bfd_error_invalid_operation); | |
670 | goto error_return; | |
671 | } | |
672 | } | |
673 | ||
674 | /* As a GNU extension, any input sections which are named | |
675 | .gnu.warning.SYMBOL are treated as warning symbols for the given | |
676 | symbol. This differs from .gnu.warning sections, which generate | |
677 | warnings when they are included in an output file. */ | |
678 | if (! info->shared) | |
679 | { | |
680 | asection *s; | |
681 | ||
682 | for (s = abfd->sections; s != NULL; s = s->next) | |
683 | { | |
684 | const char *name; | |
685 | ||
686 | name = bfd_get_section_name (abfd, s); | |
687 | if (strncmp (name, ".gnu.warning.", sizeof ".gnu.warning." - 1) == 0) | |
688 | { | |
689 | char *msg; | |
690 | bfd_size_type sz; | |
691 | ||
692 | name += sizeof ".gnu.warning." - 1; | |
693 | ||
694 | /* If this is a shared object, then look up the symbol | |
695 | in the hash table. If it is there, and it is already | |
696 | been defined, then we will not be using the entry | |
697 | from this shared object, so we don't need to warn. | |
698 | FIXME: If we see the definition in a regular object | |
699 | later on, we will warn, but we shouldn't. The only | |
700 | fix is to keep track of what warnings we are supposed | |
701 | to emit, and then handle them all at the end of the | |
702 | link. */ | |
703 | if (dynamic && abfd->xvec == info->hash->creator) | |
704 | { | |
705 | struct elf_link_hash_entry *h; | |
706 | ||
707 | h = elf_link_hash_lookup (elf_hash_table (info), name, | |
708 | false, false, true); | |
709 | ||
710 | /* FIXME: What about bfd_link_hash_common? */ | |
711 | if (h != NULL | |
712 | && (h->root.type == bfd_link_hash_defined | |
713 | || h->root.type == bfd_link_hash_defweak)) | |
714 | { | |
715 | /* We don't want to issue this warning. Clobber | |
716 | the section size so that the warning does not | |
717 | get copied into the output file. */ | |
718 | s->_raw_size = 0; | |
719 | continue; | |
720 | } | |
721 | } | |
722 | ||
723 | sz = bfd_section_size (abfd, s); | |
724 | msg = (char *) bfd_alloc (abfd, sz + 1); | |
725 | if (msg == NULL) | |
726 | goto error_return; | |
727 | ||
728 | if (! bfd_get_section_contents (abfd, s, msg, (file_ptr) 0, sz)) | |
729 | goto error_return; | |
730 | ||
731 | msg[sz] = '\0'; | |
732 | ||
733 | if (! (_bfd_generic_link_add_one_symbol | |
734 | (info, abfd, name, BSF_WARNING, s, (bfd_vma) 0, msg, | |
735 | false, collect, (struct bfd_link_hash_entry **) NULL))) | |
736 | goto error_return; | |
737 | ||
738 | if (! info->relocateable) | |
739 | { | |
740 | /* Clobber the section size so that the warning does | |
741 | not get copied into the output file. */ | |
742 | s->_raw_size = 0; | |
743 | } | |
744 | } | |
745 | } | |
746 | } | |
747 | ||
748 | /* If this is a dynamic object, we always link against the .dynsym | |
749 | symbol table, not the .symtab symbol table. The dynamic linker | |
750 | will only see the .dynsym symbol table, so there is no reason to | |
751 | look at .symtab for a dynamic object. */ | |
752 | ||
753 | if (! dynamic || elf_dynsymtab (abfd) == 0) | |
754 | hdr = &elf_tdata (abfd)->symtab_hdr; | |
755 | else | |
756 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; | |
757 | ||
758 | if (dynamic) | |
759 | { | |
760 | /* Read in any version definitions. */ | |
761 | ||
762 | if (! _bfd_elf_slurp_version_tables (abfd)) | |
763 | goto error_return; | |
764 | ||
765 | /* Read in the symbol versions, but don't bother to convert them | |
766 | to internal format. */ | |
767 | if (elf_dynversym (abfd) != 0) | |
768 | { | |
769 | Elf_Internal_Shdr *versymhdr; | |
770 | ||
771 | versymhdr = &elf_tdata (abfd)->dynversym_hdr; | |
772 | extversym = (Elf_External_Versym *) bfd_malloc (hdr->sh_size); | |
773 | if (extversym == NULL) | |
774 | goto error_return; | |
775 | if (bfd_seek (abfd, versymhdr->sh_offset, SEEK_SET) != 0 | |
776 | || (bfd_read ((PTR) extversym, 1, versymhdr->sh_size, abfd) | |
777 | != versymhdr->sh_size)) | |
778 | goto error_return; | |
779 | } | |
780 | } | |
781 | ||
782 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); | |
783 | ||
784 | /* The sh_info field of the symtab header tells us where the | |
785 | external symbols start. We don't care about the local symbols at | |
786 | this point. */ | |
787 | if (elf_bad_symtab (abfd)) | |
788 | { | |
789 | extsymcount = symcount; | |
790 | extsymoff = 0; | |
791 | } | |
792 | else | |
793 | { | |
794 | extsymcount = symcount - hdr->sh_info; | |
795 | extsymoff = hdr->sh_info; | |
796 | } | |
797 | ||
798 | buf = ((Elf_External_Sym *) | |
799 | bfd_malloc (extsymcount * sizeof (Elf_External_Sym))); | |
800 | if (buf == NULL && extsymcount != 0) | |
801 | goto error_return; | |
802 | ||
803 | /* We store a pointer to the hash table entry for each external | |
804 | symbol. */ | |
805 | sym_hash = ((struct elf_link_hash_entry **) | |
806 | bfd_alloc (abfd, | |
807 | extsymcount * sizeof (struct elf_link_hash_entry *))); | |
808 | if (sym_hash == NULL) | |
809 | goto error_return; | |
810 | elf_sym_hashes (abfd) = sym_hash; | |
811 | ||
812 | if (! dynamic) | |
813 | { | |
814 | /* If we are creating a shared library, create all the dynamic | |
815 | sections immediately. We need to attach them to something, | |
816 | so we attach them to this BFD, provided it is the right | |
817 | format. FIXME: If there are no input BFD's of the same | |
818 | format as the output, we can't make a shared library. */ | |
819 | if (info->shared | |
820 | && ! elf_hash_table (info)->dynamic_sections_created | |
821 | && abfd->xvec == info->hash->creator) | |
822 | { | |
823 | if (! elf_link_create_dynamic_sections (abfd, info)) | |
824 | goto error_return; | |
825 | } | |
826 | } | |
827 | else | |
828 | { | |
829 | asection *s; | |
830 | boolean add_needed; | |
831 | const char *name; | |
832 | bfd_size_type oldsize; | |
833 | bfd_size_type strindex; | |
834 | ||
835 | /* Find the name to use in a DT_NEEDED entry that refers to this | |
836 | object. If the object has a DT_SONAME entry, we use it. | |
837 | Otherwise, if the generic linker stuck something in | |
838 | elf_dt_name, we use that. Otherwise, we just use the file | |
839 | name. If the generic linker put a null string into | |
840 | elf_dt_name, we don't make a DT_NEEDED entry at all, even if | |
841 | there is a DT_SONAME entry. */ | |
842 | add_needed = true; | |
843 | name = bfd_get_filename (abfd); | |
844 | if (elf_dt_name (abfd) != NULL) | |
845 | { | |
846 | name = elf_dt_name (abfd); | |
847 | if (*name == '\0') | |
848 | add_needed = false; | |
849 | } | |
850 | s = bfd_get_section_by_name (abfd, ".dynamic"); | |
851 | if (s != NULL) | |
852 | { | |
853 | Elf_External_Dyn *extdyn; | |
854 | Elf_External_Dyn *extdynend; | |
855 | int elfsec; | |
856 | unsigned long link; | |
857 | ||
858 | dynbuf = (Elf_External_Dyn *) bfd_malloc ((size_t) s->_raw_size); | |
859 | if (dynbuf == NULL) | |
860 | goto error_return; | |
861 | ||
862 | if (! bfd_get_section_contents (abfd, s, (PTR) dynbuf, | |
863 | (file_ptr) 0, s->_raw_size)) | |
864 | goto error_return; | |
865 | ||
866 | elfsec = _bfd_elf_section_from_bfd_section (abfd, s); | |
867 | if (elfsec == -1) | |
868 | goto error_return; | |
869 | link = elf_elfsections (abfd)[elfsec]->sh_link; | |
870 | ||
871 | extdyn = dynbuf; | |
872 | extdynend = extdyn + s->_raw_size / sizeof (Elf_External_Dyn); | |
873 | for (; extdyn < extdynend; extdyn++) | |
874 | { | |
875 | Elf_Internal_Dyn dyn; | |
876 | ||
877 | elf_swap_dyn_in (abfd, extdyn, &dyn); | |
878 | if (dyn.d_tag == DT_SONAME) | |
879 | { | |
880 | name = bfd_elf_string_from_elf_section (abfd, link, | |
881 | dyn.d_un.d_val); | |
882 | if (name == NULL) | |
883 | goto error_return; | |
884 | } | |
885 | if (dyn.d_tag == DT_NEEDED) | |
886 | { | |
887 | struct bfd_link_needed_list *n, **pn; | |
888 | char *fnm, *anm; | |
889 | ||
890 | n = ((struct bfd_link_needed_list *) | |
891 | bfd_alloc (abfd, sizeof (struct bfd_link_needed_list))); | |
892 | fnm = bfd_elf_string_from_elf_section (abfd, link, | |
893 | dyn.d_un.d_val); | |
894 | if (n == NULL || fnm == NULL) | |
895 | goto error_return; | |
896 | anm = bfd_alloc (abfd, strlen (fnm) + 1); | |
897 | if (anm == NULL) | |
898 | goto error_return; | |
899 | strcpy (anm, fnm); | |
900 | n->name = anm; | |
901 | n->by = abfd; | |
902 | n->next = NULL; | |
903 | for (pn = &elf_hash_table (info)->needed; | |
904 | *pn != NULL; | |
905 | pn = &(*pn)->next) | |
906 | ; | |
907 | *pn = n; | |
908 | } | |
909 | } | |
910 | ||
911 | free (dynbuf); | |
912 | dynbuf = NULL; | |
913 | } | |
914 | ||
915 | /* We do not want to include any of the sections in a dynamic | |
916 | object in the output file. We hack by simply clobbering the | |
917 | list of sections in the BFD. This could be handled more | |
918 | cleanly by, say, a new section flag; the existing | |
919 | SEC_NEVER_LOAD flag is not the one we want, because that one | |
920 | still implies that the section takes up space in the output | |
921 | file. */ | |
922 | abfd->sections = NULL; | |
923 | abfd->section_count = 0; | |
924 | ||
925 | /* If this is the first dynamic object found in the link, create | |
926 | the special sections required for dynamic linking. */ | |
927 | if (! elf_hash_table (info)->dynamic_sections_created) | |
928 | { | |
929 | if (! elf_link_create_dynamic_sections (abfd, info)) | |
930 | goto error_return; | |
931 | } | |
932 | ||
933 | if (add_needed) | |
934 | { | |
935 | /* Add a DT_NEEDED entry for this dynamic object. */ | |
936 | oldsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr); | |
937 | strindex = _bfd_stringtab_add (elf_hash_table (info)->dynstr, name, | |
938 | true, false); | |
939 | if (strindex == (bfd_size_type) -1) | |
940 | goto error_return; | |
941 | ||
942 | if (oldsize == _bfd_stringtab_size (elf_hash_table (info)->dynstr)) | |
943 | { | |
944 | asection *sdyn; | |
945 | Elf_External_Dyn *dyncon, *dynconend; | |
946 | ||
947 | /* The hash table size did not change, which means that | |
948 | the dynamic object name was already entered. If we | |
949 | have already included this dynamic object in the | |
950 | link, just ignore it. There is no reason to include | |
951 | a particular dynamic object more than once. */ | |
952 | sdyn = bfd_get_section_by_name (elf_hash_table (info)->dynobj, | |
953 | ".dynamic"); | |
954 | BFD_ASSERT (sdyn != NULL); | |
955 | ||
956 | dyncon = (Elf_External_Dyn *) sdyn->contents; | |
957 | dynconend = (Elf_External_Dyn *) (sdyn->contents + | |
958 | sdyn->_raw_size); | |
959 | for (; dyncon < dynconend; dyncon++) | |
960 | { | |
961 | Elf_Internal_Dyn dyn; | |
962 | ||
963 | elf_swap_dyn_in (elf_hash_table (info)->dynobj, dyncon, | |
964 | &dyn); | |
965 | if (dyn.d_tag == DT_NEEDED | |
966 | && dyn.d_un.d_val == strindex) | |
967 | { | |
968 | if (buf != NULL) | |
969 | free (buf); | |
970 | if (extversym != NULL) | |
971 | free (extversym); | |
972 | return true; | |
973 | } | |
974 | } | |
975 | } | |
976 | ||
977 | if (! elf_add_dynamic_entry (info, DT_NEEDED, strindex)) | |
978 | goto error_return; | |
979 | } | |
980 | ||
981 | /* Save the SONAME, if there is one, because sometimes the | |
982 | linker emulation code will need to know it. */ | |
983 | if (*name == '\0') | |
984 | name = bfd_get_filename (abfd); | |
985 | elf_dt_name (abfd) = name; | |
986 | } | |
987 | ||
988 | if (bfd_seek (abfd, | |
989 | hdr->sh_offset + extsymoff * sizeof (Elf_External_Sym), | |
990 | SEEK_SET) != 0 | |
991 | || (bfd_read ((PTR) buf, sizeof (Elf_External_Sym), extsymcount, abfd) | |
992 | != extsymcount * sizeof (Elf_External_Sym))) | |
993 | goto error_return; | |
994 | ||
995 | weaks = NULL; | |
996 | ||
997 | ever = extversym != NULL ? extversym + extsymoff : NULL; | |
998 | esymend = buf + extsymcount; | |
999 | for (esym = buf; | |
1000 | esym < esymend; | |
1001 | esym++, sym_hash++, ever = (ever != NULL ? ever + 1 : NULL)) | |
1002 | { | |
1003 | Elf_Internal_Sym sym; | |
1004 | int bind; | |
1005 | bfd_vma value; | |
1006 | asection *sec; | |
1007 | flagword flags; | |
1008 | const char *name; | |
1009 | struct elf_link_hash_entry *h; | |
1010 | boolean definition; | |
1011 | boolean size_change_ok, type_change_ok; | |
1012 | boolean new_weakdef; | |
1013 | unsigned int old_alignment; | |
1014 | ||
1015 | elf_swap_symbol_in (abfd, esym, &sym); | |
1016 | ||
1017 | flags = BSF_NO_FLAGS; | |
1018 | sec = NULL; | |
1019 | value = sym.st_value; | |
1020 | *sym_hash = NULL; | |
1021 | ||
1022 | bind = ELF_ST_BIND (sym.st_info); | |
1023 | if (bind == STB_LOCAL) | |
1024 | { | |
1025 | /* This should be impossible, since ELF requires that all | |
1026 | global symbols follow all local symbols, and that sh_info | |
1027 | point to the first global symbol. Unfortunatealy, Irix 5 | |
1028 | screws this up. */ | |
1029 | continue; | |
1030 | } | |
1031 | else if (bind == STB_GLOBAL) | |
1032 | { | |
1033 | if (sym.st_shndx != SHN_UNDEF | |
1034 | && sym.st_shndx != SHN_COMMON) | |
1035 | flags = BSF_GLOBAL; | |
1036 | else | |
1037 | flags = 0; | |
1038 | } | |
1039 | else if (bind == STB_WEAK) | |
1040 | flags = BSF_WEAK; | |
1041 | else | |
1042 | { | |
1043 | /* Leave it up to the processor backend. */ | |
1044 | } | |
1045 | ||
1046 | if (sym.st_shndx == SHN_UNDEF) | |
1047 | sec = bfd_und_section_ptr; | |
1048 | else if (sym.st_shndx > 0 && sym.st_shndx < SHN_LORESERVE) | |
1049 | { | |
1050 | sec = section_from_elf_index (abfd, sym.st_shndx); | |
1051 | if (sec == NULL) | |
1052 | sec = bfd_abs_section_ptr; | |
1053 | else if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) | |
1054 | value -= sec->vma; | |
1055 | } | |
1056 | else if (sym.st_shndx == SHN_ABS) | |
1057 | sec = bfd_abs_section_ptr; | |
1058 | else if (sym.st_shndx == SHN_COMMON) | |
1059 | { | |
1060 | sec = bfd_com_section_ptr; | |
1061 | /* What ELF calls the size we call the value. What ELF | |
1062 | calls the value we call the alignment. */ | |
1063 | value = sym.st_size; | |
1064 | } | |
1065 | else | |
1066 | { | |
1067 | /* Leave it up to the processor backend. */ | |
1068 | } | |
1069 | ||
1070 | name = bfd_elf_string_from_elf_section (abfd, hdr->sh_link, sym.st_name); | |
1071 | if (name == (const char *) NULL) | |
1072 | goto error_return; | |
1073 | ||
1074 | if (add_symbol_hook) | |
1075 | { | |
1076 | if (! (*add_symbol_hook) (abfd, info, &sym, &name, &flags, &sec, | |
1077 | &value)) | |
1078 | goto error_return; | |
1079 | ||
1080 | /* The hook function sets the name to NULL if this symbol | |
1081 | should be skipped for some reason. */ | |
1082 | if (name == (const char *) NULL) | |
1083 | continue; | |
1084 | } | |
1085 | ||
1086 | /* Sanity check that all possibilities were handled. */ | |
1087 | if (sec == (asection *) NULL) | |
1088 | { | |
1089 | bfd_set_error (bfd_error_bad_value); | |
1090 | goto error_return; | |
1091 | } | |
1092 | ||
1093 | if (bfd_is_und_section (sec) | |
1094 | || bfd_is_com_section (sec)) | |
1095 | definition = false; | |
1096 | else | |
1097 | definition = true; | |
1098 | ||
1099 | size_change_ok = false; | |
1100 | type_change_ok = get_elf_backend_data (abfd)->type_change_ok; | |
1101 | old_alignment = 0; | |
1102 | if (info->hash->creator->flavour == bfd_target_elf_flavour) | |
1103 | { | |
1104 | Elf_Internal_Versym iver; | |
1105 | unsigned int vernum = 0; | |
1106 | boolean override; | |
1107 | ||
1108 | if (ever != NULL) | |
1109 | { | |
1110 | _bfd_elf_swap_versym_in (abfd, ever, &iver); | |
1111 | vernum = iver.vs_vers & VERSYM_VERSION; | |
1112 | ||
1113 | /* If this is a hidden symbol, or if it is not version | |
1114 | 1, we append the version name to the symbol name. | |
1115 | However, we do not modify a non-hidden absolute | |
1116 | symbol, because it might be the version symbol | |
1117 | itself. FIXME: What if it isn't? */ | |
1118 | if ((iver.vs_vers & VERSYM_HIDDEN) != 0 | |
1119 | || (vernum > 1 && ! bfd_is_abs_section (sec))) | |
1120 | { | |
1121 | const char *verstr; | |
1122 | int namelen, newlen; | |
1123 | char *newname, *p; | |
1124 | ||
1125 | if (sym.st_shndx != SHN_UNDEF) | |
1126 | { | |
1127 | if (vernum > elf_tdata (abfd)->dynverdef_hdr.sh_info) | |
1128 | { | |
1129 | (*_bfd_error_handler) | |
1130 | (_("%s: %s: invalid version %u (max %d)"), | |
1131 | bfd_get_filename (abfd), name, vernum, | |
1132 | elf_tdata (abfd)->dynverdef_hdr.sh_info); | |
1133 | bfd_set_error (bfd_error_bad_value); | |
1134 | goto error_return; | |
1135 | } | |
1136 | else if (vernum > 1) | |
1137 | verstr = | |
1138 | elf_tdata (abfd)->verdef[vernum - 1].vd_nodename; | |
1139 | else | |
1140 | verstr = ""; | |
1141 | } | |
1142 | else | |
1143 | { | |
1144 | /* We cannot simply test for the number of | |
1145 | entries in the VERNEED section since the | |
1146 | numbers for the needed versions do not start | |
1147 | at 0. */ | |
1148 | Elf_Internal_Verneed *t; | |
1149 | ||
1150 | verstr = NULL; | |
1151 | for (t = elf_tdata (abfd)->verref; | |
1152 | t != NULL; | |
1153 | t = t->vn_nextref) | |
1154 | { | |
1155 | Elf_Internal_Vernaux *a; | |
1156 | ||
1157 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) | |
1158 | { | |
1159 | if (a->vna_other == vernum) | |
1160 | { | |
1161 | verstr = a->vna_nodename; | |
1162 | break; | |
1163 | } | |
1164 | } | |
1165 | if (a != NULL) | |
1166 | break; | |
1167 | } | |
1168 | if (verstr == NULL) | |
1169 | { | |
1170 | (*_bfd_error_handler) | |
1171 | (_("%s: %s: invalid needed version %d"), | |
1172 | bfd_get_filename (abfd), name, vernum); | |
1173 | bfd_set_error (bfd_error_bad_value); | |
1174 | goto error_return; | |
1175 | } | |
1176 | } | |
1177 | ||
1178 | namelen = strlen (name); | |
1179 | newlen = namelen + strlen (verstr) + 2; | |
1180 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0) | |
1181 | ++newlen; | |
1182 | ||
1183 | newname = (char *) bfd_alloc (abfd, newlen); | |
1184 | if (newname == NULL) | |
1185 | goto error_return; | |
1186 | strcpy (newname, name); | |
1187 | p = newname + namelen; | |
1188 | *p++ = ELF_VER_CHR; | |
1189 | if ((iver.vs_vers & VERSYM_HIDDEN) == 0) | |
1190 | *p++ = ELF_VER_CHR; | |
1191 | strcpy (p, verstr); | |
1192 | ||
1193 | name = newname; | |
1194 | } | |
1195 | } | |
1196 | ||
1197 | if (! elf_merge_symbol (abfd, info, name, &sym, &sec, &value, | |
1198 | sym_hash, &override, &type_change_ok, | |
1199 | &size_change_ok)) | |
1200 | goto error_return; | |
1201 | ||
1202 | if (override) | |
1203 | definition = false; | |
1204 | ||
1205 | h = *sym_hash; | |
1206 | while (h->root.type == bfd_link_hash_indirect | |
1207 | || h->root.type == bfd_link_hash_warning) | |
1208 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1209 | ||
1210 | /* Remember the old alignment if this is a common symbol, so | |
1211 | that we don't reduce the alignment later on. We can't | |
1212 | check later, because _bfd_generic_link_add_one_symbol | |
1213 | will set a default for the alignment which we want to | |
1214 | override. */ | |
1215 | if (h->root.type == bfd_link_hash_common) | |
1216 | old_alignment = h->root.u.c.p->alignment_power; | |
1217 | ||
1218 | if (elf_tdata (abfd)->verdef != NULL | |
1219 | && ! override | |
1220 | && vernum > 1 | |
1221 | && definition) | |
1222 | h->verinfo.verdef = &elf_tdata (abfd)->verdef[vernum - 1]; | |
1223 | } | |
1224 | ||
1225 | if (! (_bfd_generic_link_add_one_symbol | |
1226 | (info, abfd, name, flags, sec, value, (const char *) NULL, | |
1227 | false, collect, (struct bfd_link_hash_entry **) sym_hash))) | |
1228 | goto error_return; | |
1229 | ||
1230 | h = *sym_hash; | |
1231 | while (h->root.type == bfd_link_hash_indirect | |
1232 | || h->root.type == bfd_link_hash_warning) | |
1233 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1234 | *sym_hash = h; | |
1235 | ||
1236 | new_weakdef = false; | |
1237 | if (dynamic | |
1238 | && definition | |
1239 | && (flags & BSF_WEAK) != 0 | |
1240 | && ELF_ST_TYPE (sym.st_info) != STT_FUNC | |
1241 | && info->hash->creator->flavour == bfd_target_elf_flavour | |
1242 | && h->weakdef == NULL) | |
1243 | { | |
1244 | /* Keep a list of all weak defined non function symbols from | |
1245 | a dynamic object, using the weakdef field. Later in this | |
1246 | function we will set the weakdef field to the correct | |
1247 | value. We only put non-function symbols from dynamic | |
1248 | objects on this list, because that happens to be the only | |
1249 | time we need to know the normal symbol corresponding to a | |
1250 | weak symbol, and the information is time consuming to | |
1251 | figure out. If the weakdef field is not already NULL, | |
1252 | then this symbol was already defined by some previous | |
1253 | dynamic object, and we will be using that previous | |
1254 | definition anyhow. */ | |
1255 | ||
1256 | h->weakdef = weaks; | |
1257 | weaks = h; | |
1258 | new_weakdef = true; | |
1259 | } | |
1260 | ||
1261 | /* Set the alignment of a common symbol. */ | |
1262 | if (sym.st_shndx == SHN_COMMON | |
1263 | && h->root.type == bfd_link_hash_common) | |
1264 | { | |
1265 | unsigned int align; | |
1266 | ||
1267 | align = bfd_log2 (sym.st_value); | |
1268 | if (align > old_alignment) | |
1269 | h->root.u.c.p->alignment_power = align; | |
1270 | } | |
1271 | ||
1272 | if (info->hash->creator->flavour == bfd_target_elf_flavour) | |
1273 | { | |
1274 | int old_flags; | |
1275 | boolean dynsym; | |
1276 | int new_flag; | |
1277 | ||
1278 | /* Remember the symbol size and type. */ | |
1279 | if (sym.st_size != 0 | |
1280 | && (definition || h->size == 0)) | |
1281 | { | |
1282 | if (h->size != 0 && h->size != sym.st_size && ! size_change_ok) | |
1283 | (*_bfd_error_handler) | |
1284 | (_("Warning: size of symbol `%s' changed from %lu to %lu in %s"), | |
1285 | name, (unsigned long) h->size, (unsigned long) sym.st_size, | |
1286 | bfd_get_filename (abfd)); | |
1287 | ||
1288 | h->size = sym.st_size; | |
1289 | } | |
1290 | ||
1291 | /* If this is a common symbol, then we always want H->SIZE | |
1292 | to be the size of the common symbol. The code just above | |
1293 | won't fix the size if a common symbol becomes larger. We | |
1294 | don't warn about a size change here, because that is | |
1295 | covered by --warn-common. */ | |
1296 | if (h->root.type == bfd_link_hash_common) | |
1297 | h->size = h->root.u.c.size; | |
1298 | ||
1299 | if (ELF_ST_TYPE (sym.st_info) != STT_NOTYPE | |
1300 | && (definition || h->type == STT_NOTYPE)) | |
1301 | { | |
1302 | if (h->type != STT_NOTYPE | |
1303 | && h->type != ELF_ST_TYPE (sym.st_info) | |
1304 | && ! type_change_ok) | |
1305 | (*_bfd_error_handler) | |
1306 | (_("Warning: type of symbol `%s' changed from %d to %d in %s"), | |
1307 | name, h->type, ELF_ST_TYPE (sym.st_info), | |
1308 | bfd_get_filename (abfd)); | |
1309 | ||
1310 | h->type = ELF_ST_TYPE (sym.st_info); | |
1311 | } | |
1312 | ||
1313 | if (sym.st_other != 0 | |
1314 | && (definition || h->other == 0)) | |
1315 | h->other = sym.st_other; | |
1316 | ||
1317 | /* Set a flag in the hash table entry indicating the type of | |
1318 | reference or definition we just found. Keep a count of | |
1319 | the number of dynamic symbols we find. A dynamic symbol | |
1320 | is one which is referenced or defined by both a regular | |
1321 | object and a shared object. */ | |
1322 | old_flags = h->elf_link_hash_flags; | |
1323 | dynsym = false; | |
1324 | if (! dynamic) | |
1325 | { | |
1326 | if (! definition) | |
1327 | { | |
1328 | new_flag = ELF_LINK_HASH_REF_REGULAR; | |
1329 | if (bind != STB_WEAK) | |
1330 | new_flag |= ELF_LINK_HASH_REF_REGULAR_NONWEAK; | |
1331 | } | |
1332 | else | |
1333 | new_flag = ELF_LINK_HASH_DEF_REGULAR; | |
1334 | if (info->shared | |
1335 | || (old_flags & (ELF_LINK_HASH_DEF_DYNAMIC | |
1336 | | ELF_LINK_HASH_REF_DYNAMIC)) != 0) | |
1337 | dynsym = true; | |
1338 | } | |
1339 | else | |
1340 | { | |
1341 | if (! definition) | |
1342 | new_flag = ELF_LINK_HASH_REF_DYNAMIC; | |
1343 | else | |
1344 | new_flag = ELF_LINK_HASH_DEF_DYNAMIC; | |
1345 | if ((old_flags & (ELF_LINK_HASH_DEF_REGULAR | |
1346 | | ELF_LINK_HASH_REF_REGULAR)) != 0 | |
1347 | || (h->weakdef != NULL | |
1348 | && ! new_weakdef | |
1349 | && h->weakdef->dynindx != -1)) | |
1350 | dynsym = true; | |
1351 | } | |
1352 | ||
1353 | h->elf_link_hash_flags |= new_flag; | |
1354 | ||
1355 | /* If this symbol has a version, and it is the default | |
1356 | version, we create an indirect symbol from the default | |
1357 | name to the fully decorated name. This will cause | |
1358 | external references which do not specify a version to be | |
1359 | bound to this version of the symbol. */ | |
1360 | if (definition) | |
1361 | { | |
1362 | char *p; | |
1363 | ||
1364 | p = strchr (name, ELF_VER_CHR); | |
1365 | if (p != NULL && p[1] == ELF_VER_CHR) | |
1366 | { | |
1367 | char *shortname; | |
1368 | struct elf_link_hash_entry *hi; | |
1369 | boolean override; | |
1370 | ||
1371 | shortname = bfd_hash_allocate (&info->hash->table, | |
1372 | p - name + 1); | |
1373 | if (shortname == NULL) | |
1374 | goto error_return; | |
1375 | strncpy (shortname, name, p - name); | |
1376 | shortname[p - name] = '\0'; | |
1377 | ||
1378 | /* We are going to create a new symbol. Merge it | |
1379 | with any existing symbol with this name. For the | |
1380 | purposes of the merge, act as though we were | |
1381 | defining the symbol we just defined, although we | |
1382 | actually going to define an indirect symbol. */ | |
1383 | type_change_ok = false; | |
1384 | size_change_ok = false; | |
1385 | if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec, | |
1386 | &value, &hi, &override, | |
1387 | &type_change_ok, &size_change_ok)) | |
1388 | goto error_return; | |
1389 | ||
1390 | if (! override) | |
1391 | { | |
1392 | if (! (_bfd_generic_link_add_one_symbol | |
1393 | (info, abfd, shortname, BSF_INDIRECT, | |
1394 | bfd_ind_section_ptr, (bfd_vma) 0, name, false, | |
1395 | collect, (struct bfd_link_hash_entry **) &hi))) | |
1396 | goto error_return; | |
1397 | } | |
1398 | else | |
1399 | { | |
1400 | /* In this case the symbol named SHORTNAME is | |
1401 | overriding the indirect symbol we want to | |
1402 | add. We were planning on making SHORTNAME an | |
1403 | indirect symbol referring to NAME. SHORTNAME | |
1404 | is the name without a version. NAME is the | |
1405 | fully versioned name, and it is the default | |
1406 | version. | |
1407 | ||
1408 | Overriding means that we already saw a | |
1409 | definition for the symbol SHORTNAME in a | |
1410 | regular object, and it is overriding the | |
1411 | symbol defined in the dynamic object. | |
1412 | ||
1413 | When this happens, we actually want to change | |
1414 | NAME, the symbol we just added, to refer to | |
1415 | SHORTNAME. This will cause references to | |
1416 | NAME in the shared object to become | |
1417 | references to SHORTNAME in the regular | |
1418 | object. This is what we expect when we | |
1419 | override a function in a shared object: that | |
1420 | the references in the shared object will be | |
1421 | mapped to the definition in the regular | |
1422 | object. */ | |
1423 | ||
1424 | while (hi->root.type == bfd_link_hash_indirect | |
1425 | || hi->root.type == bfd_link_hash_warning) | |
1426 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; | |
1427 | ||
1428 | h->root.type = bfd_link_hash_indirect; | |
1429 | h->root.u.i.link = (struct bfd_link_hash_entry *) hi; | |
1430 | if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) | |
1431 | { | |
1432 | h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC; | |
1433 | hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC; | |
1434 | if (hi->elf_link_hash_flags | |
1435 | & (ELF_LINK_HASH_REF_REGULAR | |
1436 | | ELF_LINK_HASH_DEF_REGULAR)) | |
1437 | { | |
1438 | if (! _bfd_elf_link_record_dynamic_symbol (info, | |
1439 | hi)) | |
1440 | goto error_return; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | /* Now set HI to H, so that the following code | |
1445 | will set the other fields correctly. */ | |
1446 | hi = h; | |
1447 | } | |
1448 | ||
1449 | /* If there is a duplicate definition somewhere, | |
1450 | then HI may not point to an indirect symbol. We | |
1451 | will have reported an error to the user in that | |
1452 | case. */ | |
1453 | ||
1454 | if (hi->root.type == bfd_link_hash_indirect) | |
1455 | { | |
1456 | struct elf_link_hash_entry *ht; | |
1457 | ||
1458 | /* If the symbol became indirect, then we assume | |
1459 | that we have not seen a definition before. */ | |
1460 | BFD_ASSERT ((hi->elf_link_hash_flags | |
1461 | & (ELF_LINK_HASH_DEF_DYNAMIC | |
1462 | | ELF_LINK_HASH_DEF_REGULAR)) | |
1463 | == 0); | |
1464 | ||
1465 | ht = (struct elf_link_hash_entry *) hi->root.u.i.link; | |
1466 | ||
1467 | /* Copy down any references that we may have | |
1468 | already seen to the symbol which just became | |
1469 | indirect. */ | |
1470 | ht->elf_link_hash_flags |= | |
1471 | (hi->elf_link_hash_flags | |
1472 | & (ELF_LINK_HASH_REF_DYNAMIC | |
1473 | | ELF_LINK_HASH_REF_REGULAR | |
1474 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK)); | |
1475 | ||
1476 | /* Copy over the global and procedure linkage table | |
1477 | offset entries. These may have been already set | |
1478 | up by a check_relocs routine. */ | |
1479 | if (ht->got.offset == (bfd_vma) -1) | |
1480 | { | |
1481 | ht->got.offset = hi->got.offset; | |
1482 | hi->got.offset = (bfd_vma) -1; | |
1483 | } | |
1484 | BFD_ASSERT (hi->got.offset == (bfd_vma) -1); | |
1485 | ||
1486 | if (ht->plt.offset == (bfd_vma) -1) | |
1487 | { | |
1488 | ht->plt.offset = hi->plt.offset; | |
1489 | hi->plt.offset = (bfd_vma) -1; | |
1490 | } | |
1491 | BFD_ASSERT (hi->plt.offset == (bfd_vma) -1); | |
1492 | ||
1493 | if (ht->dynindx == -1) | |
1494 | { | |
1495 | ht->dynindx = hi->dynindx; | |
1496 | ht->dynstr_index = hi->dynstr_index; | |
1497 | hi->dynindx = -1; | |
1498 | hi->dynstr_index = 0; | |
1499 | } | |
1500 | BFD_ASSERT (hi->dynindx == -1); | |
1501 | ||
1502 | /* FIXME: There may be other information to copy | |
1503 | over for particular targets. */ | |
1504 | ||
1505 | /* See if the new flags lead us to realize that | |
1506 | the symbol must be dynamic. */ | |
1507 | if (! dynsym) | |
1508 | { | |
1509 | if (! dynamic) | |
1510 | { | |
1511 | if (info->shared | |
1512 | || ((hi->elf_link_hash_flags | |
1513 | & ELF_LINK_HASH_REF_DYNAMIC) | |
1514 | != 0)) | |
1515 | dynsym = true; | |
1516 | } | |
1517 | else | |
1518 | { | |
1519 | if ((hi->elf_link_hash_flags | |
1520 | & ELF_LINK_HASH_REF_REGULAR) != 0) | |
1521 | dynsym = true; | |
1522 | } | |
1523 | } | |
1524 | } | |
1525 | ||
1526 | /* We also need to define an indirection from the | |
1527 | nondefault version of the symbol. */ | |
1528 | ||
1529 | shortname = bfd_hash_allocate (&info->hash->table, | |
1530 | strlen (name)); | |
1531 | if (shortname == NULL) | |
1532 | goto error_return; | |
1533 | strncpy (shortname, name, p - name); | |
1534 | strcpy (shortname + (p - name), p + 1); | |
1535 | ||
1536 | /* Once again, merge with any existing symbol. */ | |
1537 | type_change_ok = false; | |
1538 | size_change_ok = false; | |
1539 | if (! elf_merge_symbol (abfd, info, shortname, &sym, &sec, | |
1540 | &value, &hi, &override, | |
1541 | &type_change_ok, &size_change_ok)) | |
1542 | goto error_return; | |
1543 | ||
1544 | if (override) | |
1545 | { | |
1546 | /* Here SHORTNAME is a versioned name, so we | |
1547 | don't expect to see the type of override we | |
1548 | do in the case above. */ | |
1549 | (*_bfd_error_handler) | |
1550 | (_("%s: warning: unexpected redefinition of `%s'"), | |
1551 | bfd_get_filename (abfd), shortname); | |
1552 | } | |
1553 | else | |
1554 | { | |
1555 | if (! (_bfd_generic_link_add_one_symbol | |
1556 | (info, abfd, shortname, BSF_INDIRECT, | |
1557 | bfd_ind_section_ptr, (bfd_vma) 0, name, false, | |
1558 | collect, (struct bfd_link_hash_entry **) &hi))) | |
1559 | goto error_return; | |
1560 | ||
1561 | /* If there is a duplicate definition somewhere, | |
1562 | then HI may not point to an indirect symbol. | |
1563 | We will have reported an error to the user in | |
1564 | that case. */ | |
1565 | ||
1566 | if (hi->root.type == bfd_link_hash_indirect) | |
1567 | { | |
1568 | /* If the symbol became indirect, then we | |
1569 | assume that we have not seen a definition | |
1570 | before. */ | |
1571 | BFD_ASSERT ((hi->elf_link_hash_flags | |
1572 | & (ELF_LINK_HASH_DEF_DYNAMIC | |
1573 | | ELF_LINK_HASH_DEF_REGULAR)) | |
1574 | == 0); | |
1575 | ||
1576 | /* Copy down any references that we may have | |
1577 | already seen to the symbol which just | |
1578 | became indirect. */ | |
1579 | h->elf_link_hash_flags |= | |
1580 | (hi->elf_link_hash_flags | |
1581 | & (ELF_LINK_HASH_REF_DYNAMIC | |
1582 | | ELF_LINK_HASH_REF_REGULAR | |
1583 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK)); | |
1584 | ||
1585 | /* Copy over the global and procedure linkage | |
1586 | table offset entries. These may have been | |
1587 | already set up by a check_relocs routine. */ | |
1588 | if (h->got.offset == (bfd_vma) -1) | |
1589 | { | |
1590 | h->got.offset = hi->got.offset; | |
1591 | hi->got.offset = (bfd_vma) -1; | |
1592 | } | |
1593 | BFD_ASSERT (hi->got.offset == (bfd_vma) -1); | |
1594 | ||
1595 | if (h->plt.offset == (bfd_vma) -1) | |
1596 | { | |
1597 | h->plt.offset = hi->plt.offset; | |
1598 | hi->plt.offset = (bfd_vma) -1; | |
1599 | } | |
1600 | BFD_ASSERT (hi->got.offset == (bfd_vma) -1); | |
1601 | ||
1602 | if (h->dynindx == -1) | |
1603 | { | |
1604 | h->dynindx = hi->dynindx; | |
1605 | h->dynstr_index = hi->dynstr_index; | |
1606 | hi->dynindx = -1; | |
1607 | hi->dynstr_index = 0; | |
1608 | } | |
1609 | BFD_ASSERT (hi->dynindx == -1); | |
1610 | ||
1611 | /* FIXME: There may be other information to | |
1612 | copy over for particular targets. */ | |
1613 | ||
1614 | /* See if the new flags lead us to realize | |
1615 | that the symbol must be dynamic. */ | |
1616 | if (! dynsym) | |
1617 | { | |
1618 | if (! dynamic) | |
1619 | { | |
1620 | if (info->shared | |
1621 | || ((hi->elf_link_hash_flags | |
1622 | & ELF_LINK_HASH_REF_DYNAMIC) | |
1623 | != 0)) | |
1624 | dynsym = true; | |
1625 | } | |
1626 | else | |
1627 | { | |
1628 | if ((hi->elf_link_hash_flags | |
1629 | & ELF_LINK_HASH_REF_REGULAR) != 0) | |
1630 | dynsym = true; | |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | } | |
1635 | } | |
1636 | } | |
1637 | ||
1638 | if (dynsym && h->dynindx == -1) | |
1639 | { | |
1640 | if (! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
1641 | goto error_return; | |
1642 | if (h->weakdef != NULL | |
1643 | && ! new_weakdef | |
1644 | && h->weakdef->dynindx == -1) | |
1645 | { | |
1646 | if (! _bfd_elf_link_record_dynamic_symbol (info, | |
1647 | h->weakdef)) | |
1648 | goto error_return; | |
1649 | } | |
1650 | } | |
1651 | } | |
1652 | } | |
1653 | ||
1654 | /* Now set the weakdefs field correctly for all the weak defined | |
1655 | symbols we found. The only way to do this is to search all the | |
1656 | symbols. Since we only need the information for non functions in | |
1657 | dynamic objects, that's the only time we actually put anything on | |
1658 | the list WEAKS. We need this information so that if a regular | |
1659 | object refers to a symbol defined weakly in a dynamic object, the | |
1660 | real symbol in the dynamic object is also put in the dynamic | |
1661 | symbols; we also must arrange for both symbols to point to the | |
1662 | same memory location. We could handle the general case of symbol | |
1663 | aliasing, but a general symbol alias can only be generated in | |
1664 | assembler code, handling it correctly would be very time | |
1665 | consuming, and other ELF linkers don't handle general aliasing | |
1666 | either. */ | |
1667 | while (weaks != NULL) | |
1668 | { | |
1669 | struct elf_link_hash_entry *hlook; | |
1670 | asection *slook; | |
1671 | bfd_vma vlook; | |
1672 | struct elf_link_hash_entry **hpp; | |
1673 | struct elf_link_hash_entry **hppend; | |
1674 | ||
1675 | hlook = weaks; | |
1676 | weaks = hlook->weakdef; | |
1677 | hlook->weakdef = NULL; | |
1678 | ||
1679 | BFD_ASSERT (hlook->root.type == bfd_link_hash_defined | |
1680 | || hlook->root.type == bfd_link_hash_defweak | |
1681 | || hlook->root.type == bfd_link_hash_common | |
1682 | || hlook->root.type == bfd_link_hash_indirect); | |
1683 | slook = hlook->root.u.def.section; | |
1684 | vlook = hlook->root.u.def.value; | |
1685 | ||
1686 | hpp = elf_sym_hashes (abfd); | |
1687 | hppend = hpp + extsymcount; | |
1688 | for (; hpp < hppend; hpp++) | |
1689 | { | |
1690 | struct elf_link_hash_entry *h; | |
1691 | ||
1692 | h = *hpp; | |
1693 | if (h != NULL && h != hlook | |
1694 | && h->root.type == bfd_link_hash_defined | |
1695 | && h->root.u.def.section == slook | |
1696 | && h->root.u.def.value == vlook) | |
1697 | { | |
1698 | hlook->weakdef = h; | |
1699 | ||
1700 | /* If the weak definition is in the list of dynamic | |
1701 | symbols, make sure the real definition is put there | |
1702 | as well. */ | |
1703 | if (hlook->dynindx != -1 | |
1704 | && h->dynindx == -1) | |
1705 | { | |
1706 | if (! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
1707 | goto error_return; | |
1708 | } | |
1709 | ||
1710 | /* If the real definition is in the list of dynamic | |
1711 | symbols, make sure the weak definition is put there | |
1712 | as well. If we don't do this, then the dynamic | |
1713 | loader might not merge the entries for the real | |
1714 | definition and the weak definition. */ | |
1715 | if (h->dynindx != -1 | |
1716 | && hlook->dynindx == -1) | |
1717 | { | |
1718 | if (! _bfd_elf_link_record_dynamic_symbol (info, hlook)) | |
1719 | goto error_return; | |
1720 | } | |
1721 | ||
1722 | break; | |
1723 | } | |
1724 | } | |
1725 | } | |
1726 | ||
1727 | if (buf != NULL) | |
1728 | { | |
1729 | free (buf); | |
1730 | buf = NULL; | |
1731 | } | |
1732 | ||
1733 | if (extversym != NULL) | |
1734 | { | |
1735 | free (extversym); | |
1736 | extversym = NULL; | |
1737 | } | |
1738 | ||
1739 | /* If this object is the same format as the output object, and it is | |
1740 | not a shared library, then let the backend look through the | |
1741 | relocs. | |
1742 | ||
1743 | This is required to build global offset table entries and to | |
1744 | arrange for dynamic relocs. It is not required for the | |
1745 | particular common case of linking non PIC code, even when linking | |
1746 | against shared libraries, but unfortunately there is no way of | |
1747 | knowing whether an object file has been compiled PIC or not. | |
1748 | Looking through the relocs is not particularly time consuming. | |
1749 | The problem is that we must either (1) keep the relocs in memory, | |
1750 | which causes the linker to require additional runtime memory or | |
1751 | (2) read the relocs twice from the input file, which wastes time. | |
1752 | This would be a good case for using mmap. | |
1753 | ||
1754 | I have no idea how to handle linking PIC code into a file of a | |
1755 | different format. It probably can't be done. */ | |
1756 | check_relocs = get_elf_backend_data (abfd)->check_relocs; | |
1757 | if (! dynamic | |
1758 | && abfd->xvec == info->hash->creator | |
1759 | && check_relocs != NULL) | |
1760 | { | |
1761 | asection *o; | |
1762 | ||
1763 | for (o = abfd->sections; o != NULL; o = o->next) | |
1764 | { | |
1765 | Elf_Internal_Rela *internal_relocs; | |
1766 | boolean ok; | |
1767 | ||
1768 | if ((o->flags & SEC_RELOC) == 0 | |
1769 | || o->reloc_count == 0 | |
1770 | || ((info->strip == strip_all || info->strip == strip_debugger) | |
1771 | && (o->flags & SEC_DEBUGGING) != 0) | |
1772 | || bfd_is_abs_section (o->output_section)) | |
1773 | continue; | |
1774 | ||
1775 | internal_relocs = (NAME(_bfd_elf,link_read_relocs) | |
1776 | (abfd, o, (PTR) NULL, | |
1777 | (Elf_Internal_Rela *) NULL, | |
1778 | info->keep_memory)); | |
1779 | if (internal_relocs == NULL) | |
1780 | goto error_return; | |
1781 | ||
1782 | ok = (*check_relocs) (abfd, info, o, internal_relocs); | |
1783 | ||
1784 | if (! info->keep_memory) | |
1785 | free (internal_relocs); | |
1786 | ||
1787 | if (! ok) | |
1788 | goto error_return; | |
1789 | } | |
1790 | } | |
1791 | ||
1792 | /* If this is a non-traditional, non-relocateable link, try to | |
1793 | optimize the handling of the .stab/.stabstr sections. */ | |
1794 | if (! dynamic | |
1795 | && ! info->relocateable | |
1796 | && ! info->traditional_format | |
1797 | && info->hash->creator->flavour == bfd_target_elf_flavour | |
1798 | && (info->strip != strip_all && info->strip != strip_debugger)) | |
1799 | { | |
1800 | asection *stab, *stabstr; | |
1801 | ||
1802 | stab = bfd_get_section_by_name (abfd, ".stab"); | |
1803 | if (stab != NULL) | |
1804 | { | |
1805 | stabstr = bfd_get_section_by_name (abfd, ".stabstr"); | |
1806 | ||
1807 | if (stabstr != NULL) | |
1808 | { | |
1809 | struct bfd_elf_section_data *secdata; | |
1810 | ||
1811 | secdata = elf_section_data (stab); | |
1812 | if (! _bfd_link_section_stabs (abfd, | |
1813 | &elf_hash_table (info)->stab_info, | |
1814 | stab, stabstr, | |
1815 | &secdata->stab_info)) | |
1816 | goto error_return; | |
1817 | } | |
1818 | } | |
1819 | } | |
1820 | ||
1821 | return true; | |
1822 | ||
1823 | error_return: | |
1824 | if (buf != NULL) | |
1825 | free (buf); | |
1826 | if (dynbuf != NULL) | |
1827 | free (dynbuf); | |
1828 | if (dynver != NULL) | |
1829 | free (dynver); | |
1830 | if (extversym != NULL) | |
1831 | free (extversym); | |
1832 | return false; | |
1833 | } | |
1834 | ||
1835 | /* Create some sections which will be filled in with dynamic linking | |
1836 | information. ABFD is an input file which requires dynamic sections | |
1837 | to be created. The dynamic sections take up virtual memory space | |
1838 | when the final executable is run, so we need to create them before | |
1839 | addresses are assigned to the output sections. We work out the | |
1840 | actual contents and size of these sections later. */ | |
1841 | ||
1842 | boolean | |
1843 | elf_link_create_dynamic_sections (abfd, info) | |
1844 | bfd *abfd; | |
1845 | struct bfd_link_info *info; | |
1846 | { | |
1847 | flagword flags; | |
1848 | register asection *s; | |
1849 | struct elf_link_hash_entry *h; | |
1850 | struct elf_backend_data *bed; | |
1851 | ||
1852 | if (elf_hash_table (info)->dynamic_sections_created) | |
1853 | return true; | |
1854 | ||
1855 | /* Make sure that all dynamic sections use the same input BFD. */ | |
1856 | if (elf_hash_table (info)->dynobj == NULL) | |
1857 | elf_hash_table (info)->dynobj = abfd; | |
1858 | else | |
1859 | abfd = elf_hash_table (info)->dynobj; | |
1860 | ||
1861 | /* Note that we set the SEC_IN_MEMORY flag for all of these | |
1862 | sections. */ | |
1863 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | |
1864 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
1865 | ||
1866 | /* A dynamically linked executable has a .interp section, but a | |
1867 | shared library does not. */ | |
1868 | if (! info->shared) | |
1869 | { | |
1870 | s = bfd_make_section (abfd, ".interp"); | |
1871 | if (s == NULL | |
1872 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)) | |
1873 | return false; | |
1874 | } | |
1875 | ||
1876 | /* Create sections to hold version informations. These are removed | |
1877 | if they are not needed. */ | |
1878 | s = bfd_make_section (abfd, ".gnu.version_d"); | |
1879 | if (s == NULL | |
1880 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
1881 | || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN)) | |
1882 | return false; | |
1883 | ||
1884 | s = bfd_make_section (abfd, ".gnu.version"); | |
1885 | if (s == NULL | |
1886 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
1887 | || ! bfd_set_section_alignment (abfd, s, 1)) | |
1888 | return false; | |
1889 | ||
1890 | s = bfd_make_section (abfd, ".gnu.version_r"); | |
1891 | if (s == NULL | |
1892 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
1893 | || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN)) | |
1894 | return false; | |
1895 | ||
1896 | s = bfd_make_section (abfd, ".dynsym"); | |
1897 | if (s == NULL | |
1898 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
1899 | || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN)) | |
1900 | return false; | |
1901 | ||
1902 | s = bfd_make_section (abfd, ".dynstr"); | |
1903 | if (s == NULL | |
1904 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)) | |
1905 | return false; | |
1906 | ||
1907 | /* Create a strtab to hold the dynamic symbol names. */ | |
1908 | if (elf_hash_table (info)->dynstr == NULL) | |
1909 | { | |
1910 | elf_hash_table (info)->dynstr = elf_stringtab_init (); | |
1911 | if (elf_hash_table (info)->dynstr == NULL) | |
1912 | return false; | |
1913 | } | |
1914 | ||
1915 | s = bfd_make_section (abfd, ".dynamic"); | |
1916 | if (s == NULL | |
1917 | || ! bfd_set_section_flags (abfd, s, flags) | |
1918 | || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN)) | |
1919 | return false; | |
1920 | ||
1921 | /* The special symbol _DYNAMIC is always set to the start of the | |
1922 | .dynamic section. This call occurs before we have processed the | |
1923 | symbols for any dynamic object, so we don't have to worry about | |
1924 | overriding a dynamic definition. We could set _DYNAMIC in a | |
1925 | linker script, but we only want to define it if we are, in fact, | |
1926 | creating a .dynamic section. We don't want to define it if there | |
1927 | is no .dynamic section, since on some ELF platforms the start up | |
1928 | code examines it to decide how to initialize the process. */ | |
1929 | h = NULL; | |
1930 | if (! (_bfd_generic_link_add_one_symbol | |
1931 | (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, (bfd_vma) 0, | |
1932 | (const char *) NULL, false, get_elf_backend_data (abfd)->collect, | |
1933 | (struct bfd_link_hash_entry **) &h))) | |
1934 | return false; | |
1935 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
1936 | h->type = STT_OBJECT; | |
1937 | ||
1938 | if (info->shared | |
1939 | && ! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
1940 | return false; | |
1941 | ||
1942 | s = bfd_make_section (abfd, ".hash"); | |
1943 | if (s == NULL | |
1944 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
1945 | || ! bfd_set_section_alignment (abfd, s, LOG_FILE_ALIGN)) | |
1946 | return false; | |
1947 | ||
1948 | /* Let the backend create the rest of the sections. This lets the | |
1949 | backend set the right flags. The backend will normally create | |
1950 | the .got and .plt sections. */ | |
1951 | bed = get_elf_backend_data (abfd); | |
1952 | if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info)) | |
1953 | return false; | |
1954 | ||
1955 | elf_hash_table (info)->dynamic_sections_created = true; | |
1956 | ||
1957 | return true; | |
1958 | } | |
1959 | ||
1960 | /* Add an entry to the .dynamic table. */ | |
1961 | ||
1962 | boolean | |
1963 | elf_add_dynamic_entry (info, tag, val) | |
1964 | struct bfd_link_info *info; | |
1965 | bfd_vma tag; | |
1966 | bfd_vma val; | |
1967 | { | |
1968 | Elf_Internal_Dyn dyn; | |
1969 | bfd *dynobj; | |
1970 | asection *s; | |
1971 | size_t newsize; | |
1972 | bfd_byte *newcontents; | |
1973 | ||
1974 | dynobj = elf_hash_table (info)->dynobj; | |
1975 | ||
1976 | s = bfd_get_section_by_name (dynobj, ".dynamic"); | |
1977 | BFD_ASSERT (s != NULL); | |
1978 | ||
1979 | newsize = s->_raw_size + sizeof (Elf_External_Dyn); | |
1980 | newcontents = (bfd_byte *) bfd_realloc (s->contents, newsize); | |
1981 | if (newcontents == NULL) | |
1982 | return false; | |
1983 | ||
1984 | dyn.d_tag = tag; | |
1985 | dyn.d_un.d_val = val; | |
1986 | elf_swap_dyn_out (dynobj, &dyn, | |
1987 | (Elf_External_Dyn *) (newcontents + s->_raw_size)); | |
1988 | ||
1989 | s->_raw_size = newsize; | |
1990 | s->contents = newcontents; | |
1991 | ||
1992 | return true; | |
1993 | } | |
1994 | \f | |
1995 | ||
6b5bd373 MM |
1996 | /* Read and swap the relocs from the section indicated by SHDR. This |
1997 | may be either a REL or a RELA section. The relocations are | |
1998 | translated into RELA relocations and stored in INTERNAL_RELOCS, | |
1999 | which should have already been allocated to contain enough space. | |
2000 | The EXTERNAL_RELOCS are a buffer where the external form of the | |
2001 | relocations should be stored. | |
2002 | ||
2003 | Returns false if something goes wrong. */ | |
2004 | ||
2005 | static boolean | |
2006 | elf_link_read_relocs_from_section (abfd, shdr, external_relocs, | |
2007 | internal_relocs) | |
2008 | bfd *abfd; | |
2009 | Elf_Internal_Shdr *shdr; | |
2010 | PTR external_relocs; | |
2011 | Elf_Internal_Rela *internal_relocs; | |
2012 | { | |
2013 | /* If there aren't any relocations, that's OK. */ | |
2014 | if (!shdr) | |
2015 | return true; | |
2016 | ||
2017 | /* Position ourselves at the start of the section. */ | |
2018 | if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0) | |
2019 | return false; | |
2020 | ||
2021 | /* Read the relocations. */ | |
2022 | if (bfd_read (external_relocs, 1, shdr->sh_size, abfd) | |
2023 | != shdr->sh_size) | |
2024 | return false; | |
2025 | ||
2026 | /* Convert the external relocations to the internal format. */ | |
2027 | if (shdr->sh_entsize == sizeof (Elf_External_Rel)) | |
2028 | { | |
2029 | Elf_External_Rel *erel; | |
2030 | Elf_External_Rel *erelend; | |
2031 | Elf_Internal_Rela *irela; | |
2032 | ||
2033 | erel = (Elf_External_Rel *) external_relocs; | |
2034 | erelend = erel + shdr->sh_size / shdr->sh_entsize; | |
2035 | irela = internal_relocs; | |
2036 | for (; erel < erelend; erel++, irela++) | |
2037 | { | |
2038 | Elf_Internal_Rel irel; | |
2039 | ||
2040 | elf_swap_reloc_in (abfd, erel, &irel); | |
2041 | irela->r_offset = irel.r_offset; | |
2042 | irela->r_info = irel.r_info; | |
2043 | irela->r_addend = 0; | |
2044 | } | |
2045 | } | |
2046 | else | |
2047 | { | |
2048 | Elf_External_Rela *erela; | |
2049 | Elf_External_Rela *erelaend; | |
2050 | Elf_Internal_Rela *irela; | |
2051 | ||
2052 | BFD_ASSERT (shdr->sh_entsize == sizeof (Elf_External_Rela)); | |
2053 | ||
2054 | erela = (Elf_External_Rela *) external_relocs; | |
2055 | erelaend = erela + shdr->sh_size / shdr->sh_entsize; | |
2056 | irela = internal_relocs; | |
2057 | for (; erela < erelaend; erela++, irela++) | |
2058 | elf_swap_reloca_in (abfd, erela, irela); | |
2059 | } | |
2060 | ||
2061 | return true; | |
2062 | } | |
2063 | ||
252b5132 RH |
2064 | /* Read and swap the relocs for a section. They may have been cached. |
2065 | If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are not NULL, | |
2066 | they are used as buffers to read into. They are known to be large | |
2067 | enough. If the INTERNAL_RELOCS relocs argument is NULL, the return | |
2068 | value is allocated using either malloc or bfd_alloc, according to | |
2069 | the KEEP_MEMORY argument. */ | |
2070 | ||
2071 | Elf_Internal_Rela * | |
2072 | NAME(_bfd_elf,link_read_relocs) (abfd, o, external_relocs, internal_relocs, | |
2073 | keep_memory) | |
2074 | bfd *abfd; | |
2075 | asection *o; | |
2076 | PTR external_relocs; | |
2077 | Elf_Internal_Rela *internal_relocs; | |
2078 | boolean keep_memory; | |
2079 | { | |
2080 | Elf_Internal_Shdr *rel_hdr; | |
2081 | PTR alloc1 = NULL; | |
2082 | Elf_Internal_Rela *alloc2 = NULL; | |
2083 | ||
2084 | if (elf_section_data (o)->relocs != NULL) | |
2085 | return elf_section_data (o)->relocs; | |
2086 | ||
2087 | if (o->reloc_count == 0) | |
2088 | return NULL; | |
2089 | ||
2090 | rel_hdr = &elf_section_data (o)->rel_hdr; | |
2091 | ||
2092 | if (internal_relocs == NULL) | |
2093 | { | |
2094 | size_t size; | |
2095 | ||
2096 | size = o->reloc_count * sizeof (Elf_Internal_Rela); | |
2097 | if (keep_memory) | |
2098 | internal_relocs = (Elf_Internal_Rela *) bfd_alloc (abfd, size); | |
2099 | else | |
2100 | internal_relocs = alloc2 = (Elf_Internal_Rela *) bfd_malloc (size); | |
2101 | if (internal_relocs == NULL) | |
2102 | goto error_return; | |
2103 | } | |
2104 | ||
2105 | if (external_relocs == NULL) | |
2106 | { | |
6b5bd373 MM |
2107 | size_t size = (size_t) rel_hdr->sh_size; |
2108 | ||
2109 | if (elf_section_data (o)->rel_hdr2) | |
2110 | size += (size_t) elf_section_data (o)->rel_hdr2->sh_size; | |
2111 | alloc1 = (PTR) bfd_malloc (size); | |
252b5132 RH |
2112 | if (alloc1 == NULL) |
2113 | goto error_return; | |
2114 | external_relocs = alloc1; | |
2115 | } | |
2116 | ||
6b5bd373 MM |
2117 | if (!elf_link_read_relocs_from_section (abfd, rel_hdr, |
2118 | external_relocs, | |
2119 | internal_relocs)) | |
2120 | goto error_return; | |
2121 | if (!elf_link_read_relocs_from_section | |
2122 | (abfd, | |
2123 | elf_section_data (o)->rel_hdr2, | |
2124 | external_relocs + rel_hdr->sh_size, | |
2125 | internal_relocs + rel_hdr->sh_size / rel_hdr->sh_entsize)) | |
252b5132 | 2126 | goto error_return; |
252b5132 RH |
2127 | |
2128 | /* Cache the results for next time, if we can. */ | |
2129 | if (keep_memory) | |
2130 | elf_section_data (o)->relocs = internal_relocs; | |
2131 | ||
2132 | if (alloc1 != NULL) | |
2133 | free (alloc1); | |
2134 | ||
2135 | /* Don't free alloc2, since if it was allocated we are passing it | |
2136 | back (under the name of internal_relocs). */ | |
2137 | ||
2138 | return internal_relocs; | |
2139 | ||
2140 | error_return: | |
2141 | if (alloc1 != NULL) | |
2142 | free (alloc1); | |
2143 | if (alloc2 != NULL) | |
2144 | free (alloc2); | |
2145 | return NULL; | |
2146 | } | |
2147 | \f | |
2148 | ||
2149 | /* Record an assignment to a symbol made by a linker script. We need | |
2150 | this in case some dynamic object refers to this symbol. */ | |
2151 | ||
2152 | /*ARGSUSED*/ | |
2153 | boolean | |
2154 | NAME(bfd_elf,record_link_assignment) (output_bfd, info, name, provide) | |
2155 | bfd *output_bfd; | |
2156 | struct bfd_link_info *info; | |
2157 | const char *name; | |
2158 | boolean provide; | |
2159 | { | |
2160 | struct elf_link_hash_entry *h; | |
2161 | ||
2162 | if (info->hash->creator->flavour != bfd_target_elf_flavour) | |
2163 | return true; | |
2164 | ||
2165 | h = elf_link_hash_lookup (elf_hash_table (info), name, true, true, false); | |
2166 | if (h == NULL) | |
2167 | return false; | |
2168 | ||
2169 | if (h->root.type == bfd_link_hash_new) | |
2170 | h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF; | |
2171 | ||
2172 | /* If this symbol is being provided by the linker script, and it is | |
2173 | currently defined by a dynamic object, but not by a regular | |
2174 | object, then mark it as undefined so that the generic linker will | |
2175 | force the correct value. */ | |
2176 | if (provide | |
2177 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2178 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2179 | h->root.type = bfd_link_hash_undefined; | |
2180 | ||
2181 | /* If this symbol is not being provided by the linker script, and it is | |
2182 | currently defined by a dynamic object, but not by a regular object, | |
2183 | then clear out any version information because the symbol will not be | |
2184 | associated with the dynamic object any more. */ | |
2185 | if (!provide | |
2186 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2187 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2188 | h->verinfo.verdef = NULL; | |
2189 | ||
2190 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
2191 | h->type = STT_OBJECT; | |
2192 | ||
2193 | if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC | |
2194 | | ELF_LINK_HASH_REF_DYNAMIC)) != 0 | |
2195 | || info->shared) | |
2196 | && h->dynindx == -1) | |
2197 | { | |
2198 | if (! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
2199 | return false; | |
2200 | ||
2201 | /* If this is a weak defined symbol, and we know a corresponding | |
2202 | real symbol from the same dynamic object, make sure the real | |
2203 | symbol is also made into a dynamic symbol. */ | |
2204 | if (h->weakdef != NULL | |
2205 | && h->weakdef->dynindx == -1) | |
2206 | { | |
2207 | if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef)) | |
2208 | return false; | |
2209 | } | |
2210 | } | |
2211 | ||
2212 | return true; | |
2213 | } | |
2214 | \f | |
2215 | /* This structure is used to pass information to | |
2216 | elf_link_assign_sym_version. */ | |
2217 | ||
2218 | struct elf_assign_sym_version_info | |
2219 | { | |
2220 | /* Output BFD. */ | |
2221 | bfd *output_bfd; | |
2222 | /* General link information. */ | |
2223 | struct bfd_link_info *info; | |
2224 | /* Version tree. */ | |
2225 | struct bfd_elf_version_tree *verdefs; | |
2226 | /* Whether we are exporting all dynamic symbols. */ | |
2227 | boolean export_dynamic; | |
2228 | /* Whether we removed any symbols from the dynamic symbol table. */ | |
2229 | boolean removed_dynamic; | |
2230 | /* Whether we had a failure. */ | |
2231 | boolean failed; | |
2232 | }; | |
2233 | ||
2234 | /* This structure is used to pass information to | |
2235 | elf_link_find_version_dependencies. */ | |
2236 | ||
2237 | struct elf_find_verdep_info | |
2238 | { | |
2239 | /* Output BFD. */ | |
2240 | bfd *output_bfd; | |
2241 | /* General link information. */ | |
2242 | struct bfd_link_info *info; | |
2243 | /* The number of dependencies. */ | |
2244 | unsigned int vers; | |
2245 | /* Whether we had a failure. */ | |
2246 | boolean failed; | |
2247 | }; | |
2248 | ||
2249 | /* Array used to determine the number of hash table buckets to use | |
2250 | based on the number of symbols there are. If there are fewer than | |
2251 | 3 symbols we use 1 bucket, fewer than 17 symbols we use 3 buckets, | |
2252 | fewer than 37 we use 17 buckets, and so forth. We never use more | |
2253 | than 32771 buckets. */ | |
2254 | ||
2255 | static const size_t elf_buckets[] = | |
2256 | { | |
2257 | 1, 3, 17, 37, 67, 97, 131, 197, 263, 521, 1031, 2053, 4099, 8209, | |
2258 | 16411, 32771, 0 | |
2259 | }; | |
2260 | ||
2261 | /* Compute bucket count for hashing table. We do not use a static set | |
2262 | of possible tables sizes anymore. Instead we determine for all | |
2263 | possible reasonable sizes of the table the outcome (i.e., the | |
2264 | number of collisions etc) and choose the best solution. The | |
2265 | weighting functions are not too simple to allow the table to grow | |
2266 | without bounds. Instead one of the weighting factors is the size. | |
2267 | Therefore the result is always a good payoff between few collisions | |
2268 | (= short chain lengths) and table size. */ | |
2269 | static size_t | |
2270 | compute_bucket_count (info) | |
2271 | struct bfd_link_info *info; | |
2272 | { | |
2273 | size_t dynsymcount = elf_hash_table (info)->dynsymcount; | |
2274 | size_t best_size; | |
2275 | unsigned long int *hashcodes; | |
2276 | unsigned long int *hashcodesp; | |
2277 | unsigned long int i; | |
2278 | ||
2279 | /* Compute the hash values for all exported symbols. At the same | |
2280 | time store the values in an array so that we could use them for | |
2281 | optimizations. */ | |
2282 | hashcodes = (unsigned long int *) bfd_malloc (dynsymcount | |
2283 | * sizeof (unsigned long int)); | |
2284 | if (hashcodes == NULL) | |
2285 | return 0; | |
2286 | hashcodesp = hashcodes; | |
2287 | ||
2288 | /* Put all hash values in HASHCODES. */ | |
2289 | elf_link_hash_traverse (elf_hash_table (info), | |
2290 | elf_collect_hash_codes, &hashcodesp); | |
2291 | ||
2292 | /* We have a problem here. The following code to optimize the table | |
2293 | size requires an integer type with more the 32 bits. If | |
2294 | BFD_HOST_U_64_BIT is set we know about such a type. */ | |
2295 | #ifdef BFD_HOST_U_64_BIT | |
2296 | if (info->optimize == true) | |
2297 | { | |
2298 | unsigned long int nsyms = hashcodesp - hashcodes; | |
2299 | size_t minsize; | |
2300 | size_t maxsize; | |
2301 | BFD_HOST_U_64_BIT best_chlen = ~((BFD_HOST_U_64_BIT) 0); | |
2302 | unsigned long int *counts ; | |
2303 | ||
2304 | /* Possible optimization parameters: if we have NSYMS symbols we say | |
2305 | that the hashing table must at least have NSYMS/4 and at most | |
2306 | 2*NSYMS buckets. */ | |
2307 | minsize = nsyms / 4; | |
2308 | if (minsize == 0) | |
2309 | minsize = 1; | |
2310 | best_size = maxsize = nsyms * 2; | |
2311 | ||
2312 | /* Create array where we count the collisions in. We must use bfd_malloc | |
2313 | since the size could be large. */ | |
2314 | counts = (unsigned long int *) bfd_malloc (maxsize | |
2315 | * sizeof (unsigned long int)); | |
2316 | if (counts == NULL) | |
2317 | { | |
2318 | free (hashcodes); | |
2319 | return 0; | |
2320 | } | |
2321 | ||
2322 | /* Compute the "optimal" size for the hash table. The criteria is a | |
2323 | minimal chain length. The minor criteria is (of course) the size | |
2324 | of the table. */ | |
2325 | for (i = minsize; i < maxsize; ++i) | |
2326 | { | |
2327 | /* Walk through the array of hashcodes and count the collisions. */ | |
2328 | BFD_HOST_U_64_BIT max; | |
2329 | unsigned long int j; | |
2330 | unsigned long int fact; | |
2331 | ||
2332 | memset (counts, '\0', i * sizeof (unsigned long int)); | |
2333 | ||
2334 | /* Determine how often each hash bucket is used. */ | |
2335 | for (j = 0; j < nsyms; ++j) | |
2336 | ++counts[hashcodes[j] % i]; | |
2337 | ||
2338 | /* For the weight function we need some information about the | |
2339 | pagesize on the target. This is information need not be 100% | |
2340 | accurate. Since this information is not available (so far) we | |
2341 | define it here to a reasonable default value. If it is crucial | |
2342 | to have a better value some day simply define this value. */ | |
2343 | # ifndef BFD_TARGET_PAGESIZE | |
2344 | # define BFD_TARGET_PAGESIZE (4096) | |
2345 | # endif | |
2346 | ||
2347 | /* We in any case need 2 + NSYMS entries for the size values and | |
2348 | the chains. */ | |
2349 | max = (2 + nsyms) * (ARCH_SIZE / 8); | |
2350 | ||
2351 | # if 1 | |
2352 | /* Variant 1: optimize for short chains. We add the squares | |
2353 | of all the chain lengths (which favous many small chain | |
2354 | over a few long chains). */ | |
2355 | for (j = 0; j < i; ++j) | |
2356 | max += counts[j] * counts[j]; | |
2357 | ||
2358 | /* This adds penalties for the overall size of the table. */ | |
2359 | fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1; | |
2360 | max *= fact * fact; | |
2361 | # else | |
2362 | /* Variant 2: Optimize a lot more for small table. Here we | |
2363 | also add squares of the size but we also add penalties for | |
2364 | empty slots (the +1 term). */ | |
2365 | for (j = 0; j < i; ++j) | |
2366 | max += (1 + counts[j]) * (1 + counts[j]); | |
2367 | ||
2368 | /* The overall size of the table is considered, but not as | |
2369 | strong as in variant 1, where it is squared. */ | |
2370 | fact = i / (BFD_TARGET_PAGESIZE / (ARCH_SIZE / 8)) + 1; | |
2371 | max *= fact; | |
2372 | # endif | |
2373 | ||
2374 | /* Compare with current best results. */ | |
2375 | if (max < best_chlen) | |
2376 | { | |
2377 | best_chlen = max; | |
2378 | best_size = i; | |
2379 | } | |
2380 | } | |
2381 | ||
2382 | free (counts); | |
2383 | } | |
2384 | else | |
2385 | #endif /* defined (BFD_HOST_U_64_BIT) */ | |
2386 | { | |
2387 | /* This is the fallback solution if no 64bit type is available or if we | |
2388 | are not supposed to spend much time on optimizations. We select the | |
2389 | bucket count using a fixed set of numbers. */ | |
2390 | for (i = 0; elf_buckets[i] != 0; i++) | |
2391 | { | |
2392 | best_size = elf_buckets[i]; | |
2393 | if (dynsymcount < elf_buckets[i + 1]) | |
2394 | break; | |
2395 | } | |
2396 | } | |
2397 | ||
2398 | /* Free the arrays we needed. */ | |
2399 | free (hashcodes); | |
2400 | ||
2401 | return best_size; | |
2402 | } | |
2403 | ||
2404 | /* Set up the sizes and contents of the ELF dynamic sections. This is | |
2405 | called by the ELF linker emulation before_allocation routine. We | |
2406 | must set the sizes of the sections before the linker sets the | |
2407 | addresses of the various sections. */ | |
2408 | ||
2409 | boolean | |
2410 | NAME(bfd_elf,size_dynamic_sections) (output_bfd, soname, rpath, | |
2411 | export_dynamic, filter_shlib, | |
2412 | auxiliary_filters, info, sinterpptr, | |
2413 | verdefs) | |
2414 | bfd *output_bfd; | |
2415 | const char *soname; | |
2416 | const char *rpath; | |
2417 | boolean export_dynamic; | |
2418 | const char *filter_shlib; | |
2419 | const char * const *auxiliary_filters; | |
2420 | struct bfd_link_info *info; | |
2421 | asection **sinterpptr; | |
2422 | struct bfd_elf_version_tree *verdefs; | |
2423 | { | |
2424 | bfd_size_type soname_indx; | |
2425 | bfd *dynobj; | |
2426 | struct elf_backend_data *bed; | |
2427 | bfd_size_type old_dynsymcount; | |
2428 | struct elf_assign_sym_version_info asvinfo; | |
2429 | ||
2430 | *sinterpptr = NULL; | |
2431 | ||
2432 | soname_indx = (bfd_size_type) -1; | |
2433 | ||
2434 | if (info->hash->creator->flavour != bfd_target_elf_flavour) | |
2435 | return true; | |
2436 | ||
2437 | /* The backend may have to create some sections regardless of whether | |
2438 | we're dynamic or not. */ | |
2439 | bed = get_elf_backend_data (output_bfd); | |
2440 | if (bed->elf_backend_always_size_sections | |
2441 | && ! (*bed->elf_backend_always_size_sections) (output_bfd, info)) | |
2442 | return false; | |
2443 | ||
2444 | dynobj = elf_hash_table (info)->dynobj; | |
2445 | ||
2446 | /* If there were no dynamic objects in the link, there is nothing to | |
2447 | do here. */ | |
2448 | if (dynobj == NULL) | |
2449 | return true; | |
2450 | ||
2451 | /* If we are supposed to export all symbols into the dynamic symbol | |
2452 | table (this is not the normal case), then do so. */ | |
2453 | if (export_dynamic) | |
2454 | { | |
2455 | struct elf_info_failed eif; | |
2456 | ||
2457 | eif.failed = false; | |
2458 | eif.info = info; | |
2459 | elf_link_hash_traverse (elf_hash_table (info), elf_export_symbol, | |
2460 | (PTR) &eif); | |
2461 | if (eif.failed) | |
2462 | return false; | |
2463 | } | |
2464 | ||
2465 | if (elf_hash_table (info)->dynamic_sections_created) | |
2466 | { | |
2467 | struct elf_info_failed eif; | |
2468 | struct elf_link_hash_entry *h; | |
2469 | bfd_size_type strsize; | |
2470 | ||
2471 | *sinterpptr = bfd_get_section_by_name (dynobj, ".interp"); | |
2472 | BFD_ASSERT (*sinterpptr != NULL || info->shared); | |
2473 | ||
2474 | if (soname != NULL) | |
2475 | { | |
2476 | soname_indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2477 | soname, true, true); | |
2478 | if (soname_indx == (bfd_size_type) -1 | |
2479 | || ! elf_add_dynamic_entry (info, DT_SONAME, soname_indx)) | |
2480 | return false; | |
2481 | } | |
2482 | ||
2483 | if (info->symbolic) | |
2484 | { | |
2485 | if (! elf_add_dynamic_entry (info, DT_SYMBOLIC, 0)) | |
2486 | return false; | |
2487 | } | |
2488 | ||
2489 | if (rpath != NULL) | |
2490 | { | |
2491 | bfd_size_type indx; | |
2492 | ||
2493 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, rpath, | |
2494 | true, true); | |
2495 | if (indx == (bfd_size_type) -1 | |
2496 | || ! elf_add_dynamic_entry (info, DT_RPATH, indx)) | |
2497 | return false; | |
2498 | } | |
2499 | ||
2500 | if (filter_shlib != NULL) | |
2501 | { | |
2502 | bfd_size_type indx; | |
2503 | ||
2504 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2505 | filter_shlib, true, true); | |
2506 | if (indx == (bfd_size_type) -1 | |
2507 | || ! elf_add_dynamic_entry (info, DT_FILTER, indx)) | |
2508 | return false; | |
2509 | } | |
2510 | ||
2511 | if (auxiliary_filters != NULL) | |
2512 | { | |
2513 | const char * const *p; | |
2514 | ||
2515 | for (p = auxiliary_filters; *p != NULL; p++) | |
2516 | { | |
2517 | bfd_size_type indx; | |
2518 | ||
2519 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2520 | *p, true, true); | |
2521 | if (indx == (bfd_size_type) -1 | |
2522 | || ! elf_add_dynamic_entry (info, DT_AUXILIARY, indx)) | |
2523 | return false; | |
2524 | } | |
2525 | } | |
2526 | ||
2527 | /* Attach all the symbols to their version information. */ | |
2528 | asvinfo.output_bfd = output_bfd; | |
2529 | asvinfo.info = info; | |
2530 | asvinfo.verdefs = verdefs; | |
2531 | asvinfo.export_dynamic = export_dynamic; | |
2532 | asvinfo.removed_dynamic = false; | |
2533 | asvinfo.failed = false; | |
2534 | ||
2535 | elf_link_hash_traverse (elf_hash_table (info), | |
2536 | elf_link_assign_sym_version, | |
2537 | (PTR) &asvinfo); | |
2538 | if (asvinfo.failed) | |
2539 | return false; | |
2540 | ||
2541 | /* Find all symbols which were defined in a dynamic object and make | |
2542 | the backend pick a reasonable value for them. */ | |
2543 | eif.failed = false; | |
2544 | eif.info = info; | |
2545 | elf_link_hash_traverse (elf_hash_table (info), | |
2546 | elf_adjust_dynamic_symbol, | |
2547 | (PTR) &eif); | |
2548 | if (eif.failed) | |
2549 | return false; | |
2550 | ||
2551 | /* Add some entries to the .dynamic section. We fill in some of the | |
2552 | values later, in elf_bfd_final_link, but we must add the entries | |
2553 | now so that we know the final size of the .dynamic section. */ | |
2554 | h = elf_link_hash_lookup (elf_hash_table (info), "_init", false, | |
2555 | false, false); | |
2556 | if (h != NULL | |
2557 | && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR | |
2558 | | ELF_LINK_HASH_DEF_REGULAR)) != 0) | |
2559 | { | |
2560 | if (! elf_add_dynamic_entry (info, DT_INIT, 0)) | |
2561 | return false; | |
2562 | } | |
2563 | h = elf_link_hash_lookup (elf_hash_table (info), "_fini", false, | |
2564 | false, false); | |
2565 | if (h != NULL | |
2566 | && (h->elf_link_hash_flags & (ELF_LINK_HASH_REF_REGULAR | |
2567 | | ELF_LINK_HASH_DEF_REGULAR)) != 0) | |
2568 | { | |
2569 | if (! elf_add_dynamic_entry (info, DT_FINI, 0)) | |
2570 | return false; | |
2571 | } | |
2572 | strsize = _bfd_stringtab_size (elf_hash_table (info)->dynstr); | |
2573 | if (! elf_add_dynamic_entry (info, DT_HASH, 0) | |
2574 | || ! elf_add_dynamic_entry (info, DT_STRTAB, 0) | |
2575 | || ! elf_add_dynamic_entry (info, DT_SYMTAB, 0) | |
2576 | || ! elf_add_dynamic_entry (info, DT_STRSZ, strsize) | |
2577 | || ! elf_add_dynamic_entry (info, DT_SYMENT, | |
2578 | sizeof (Elf_External_Sym))) | |
2579 | return false; | |
2580 | } | |
2581 | ||
2582 | /* The backend must work out the sizes of all the other dynamic | |
2583 | sections. */ | |
2584 | old_dynsymcount = elf_hash_table (info)->dynsymcount; | |
2585 | if (bed->elf_backend_size_dynamic_sections | |
2586 | && ! (*bed->elf_backend_size_dynamic_sections) (output_bfd, info)) | |
2587 | return false; | |
2588 | ||
2589 | if (elf_hash_table (info)->dynamic_sections_created) | |
2590 | { | |
2591 | size_t dynsymcount; | |
2592 | asection *s; | |
2593 | size_t bucketcount = 0; | |
2594 | Elf_Internal_Sym isym; | |
2595 | ||
2596 | /* Set up the version definition section. */ | |
2597 | s = bfd_get_section_by_name (dynobj, ".gnu.version_d"); | |
2598 | BFD_ASSERT (s != NULL); | |
2599 | ||
2600 | /* We may have created additional version definitions if we are | |
2601 | just linking a regular application. */ | |
2602 | verdefs = asvinfo.verdefs; | |
2603 | ||
2604 | if (verdefs == NULL) | |
2605 | { | |
2606 | asection **spp; | |
2607 | ||
2608 | /* Don't include this section in the output file. */ | |
2609 | for (spp = &output_bfd->sections; | |
2610 | *spp != s->output_section; | |
2611 | spp = &(*spp)->next) | |
2612 | ; | |
2613 | *spp = s->output_section->next; | |
2614 | --output_bfd->section_count; | |
2615 | } | |
2616 | else | |
2617 | { | |
2618 | unsigned int cdefs; | |
2619 | bfd_size_type size; | |
2620 | struct bfd_elf_version_tree *t; | |
2621 | bfd_byte *p; | |
2622 | Elf_Internal_Verdef def; | |
2623 | Elf_Internal_Verdaux defaux; | |
2624 | ||
2625 | if (asvinfo.removed_dynamic) | |
2626 | { | |
2627 | /* Some dynamic symbols were changed to be local | |
2628 | symbols. In this case, we renumber all of the | |
2629 | dynamic symbols, so that we don't have a hole. If | |
2630 | the backend changed dynsymcount, then assume that the | |
2631 | new symbols are at the start. This is the case on | |
2632 | the MIPS. FIXME: The names of the removed symbols | |
2633 | will still be in the dynamic string table, wasting | |
2634 | space. */ | |
2635 | elf_hash_table (info)->dynsymcount = | |
2636 | 1 + (elf_hash_table (info)->dynsymcount - old_dynsymcount); | |
2637 | elf_link_hash_traverse (elf_hash_table (info), | |
2638 | elf_link_renumber_dynsyms, | |
2639 | (PTR) info); | |
2640 | } | |
2641 | ||
2642 | cdefs = 0; | |
2643 | size = 0; | |
2644 | ||
2645 | /* Make space for the base version. */ | |
2646 | size += sizeof (Elf_External_Verdef); | |
2647 | size += sizeof (Elf_External_Verdaux); | |
2648 | ++cdefs; | |
2649 | ||
2650 | for (t = verdefs; t != NULL; t = t->next) | |
2651 | { | |
2652 | struct bfd_elf_version_deps *n; | |
2653 | ||
2654 | size += sizeof (Elf_External_Verdef); | |
2655 | size += sizeof (Elf_External_Verdaux); | |
2656 | ++cdefs; | |
2657 | ||
2658 | for (n = t->deps; n != NULL; n = n->next) | |
2659 | size += sizeof (Elf_External_Verdaux); | |
2660 | } | |
2661 | ||
2662 | s->_raw_size = size; | |
2663 | s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size); | |
2664 | if (s->contents == NULL && s->_raw_size != 0) | |
2665 | return false; | |
2666 | ||
2667 | /* Fill in the version definition section. */ | |
2668 | ||
2669 | p = s->contents; | |
2670 | ||
2671 | def.vd_version = VER_DEF_CURRENT; | |
2672 | def.vd_flags = VER_FLG_BASE; | |
2673 | def.vd_ndx = 1; | |
2674 | def.vd_cnt = 1; | |
2675 | def.vd_aux = sizeof (Elf_External_Verdef); | |
2676 | def.vd_next = (sizeof (Elf_External_Verdef) | |
2677 | + sizeof (Elf_External_Verdaux)); | |
2678 | ||
2679 | if (soname_indx != (bfd_size_type) -1) | |
2680 | { | |
2681 | def.vd_hash = bfd_elf_hash ((const unsigned char *) soname); | |
2682 | defaux.vda_name = soname_indx; | |
2683 | } | |
2684 | else | |
2685 | { | |
2686 | const char *name; | |
2687 | bfd_size_type indx; | |
2688 | ||
2689 | name = output_bfd->filename; | |
2690 | def.vd_hash = bfd_elf_hash ((const unsigned char *) name); | |
2691 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2692 | name, true, false); | |
2693 | if (indx == (bfd_size_type) -1) | |
2694 | return false; | |
2695 | defaux.vda_name = indx; | |
2696 | } | |
2697 | defaux.vda_next = 0; | |
2698 | ||
2699 | _bfd_elf_swap_verdef_out (output_bfd, &def, | |
2700 | (Elf_External_Verdef *)p); | |
2701 | p += sizeof (Elf_External_Verdef); | |
2702 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, | |
2703 | (Elf_External_Verdaux *) p); | |
2704 | p += sizeof (Elf_External_Verdaux); | |
2705 | ||
2706 | for (t = verdefs; t != NULL; t = t->next) | |
2707 | { | |
2708 | unsigned int cdeps; | |
2709 | struct bfd_elf_version_deps *n; | |
2710 | struct elf_link_hash_entry *h; | |
2711 | ||
2712 | cdeps = 0; | |
2713 | for (n = t->deps; n != NULL; n = n->next) | |
2714 | ++cdeps; | |
2715 | ||
2716 | /* Add a symbol representing this version. */ | |
2717 | h = NULL; | |
2718 | if (! (_bfd_generic_link_add_one_symbol | |
2719 | (info, dynobj, t->name, BSF_GLOBAL, bfd_abs_section_ptr, | |
2720 | (bfd_vma) 0, (const char *) NULL, false, | |
2721 | get_elf_backend_data (dynobj)->collect, | |
2722 | (struct bfd_link_hash_entry **) &h))) | |
2723 | return false; | |
2724 | h->elf_link_hash_flags &= ~ ELF_LINK_NON_ELF; | |
2725 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
2726 | h->type = STT_OBJECT; | |
2727 | h->verinfo.vertree = t; | |
2728 | ||
2729 | if (! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
2730 | return false; | |
2731 | ||
2732 | def.vd_version = VER_DEF_CURRENT; | |
2733 | def.vd_flags = 0; | |
2734 | if (t->globals == NULL && t->locals == NULL && ! t->used) | |
2735 | def.vd_flags |= VER_FLG_WEAK; | |
2736 | def.vd_ndx = t->vernum + 1; | |
2737 | def.vd_cnt = cdeps + 1; | |
2738 | def.vd_hash = bfd_elf_hash ((const unsigned char *) t->name); | |
2739 | def.vd_aux = sizeof (Elf_External_Verdef); | |
2740 | if (t->next != NULL) | |
2741 | def.vd_next = (sizeof (Elf_External_Verdef) | |
2742 | + (cdeps + 1) * sizeof (Elf_External_Verdaux)); | |
2743 | else | |
2744 | def.vd_next = 0; | |
2745 | ||
2746 | _bfd_elf_swap_verdef_out (output_bfd, &def, | |
2747 | (Elf_External_Verdef *) p); | |
2748 | p += sizeof (Elf_External_Verdef); | |
2749 | ||
2750 | defaux.vda_name = h->dynstr_index; | |
2751 | if (t->deps == NULL) | |
2752 | defaux.vda_next = 0; | |
2753 | else | |
2754 | defaux.vda_next = sizeof (Elf_External_Verdaux); | |
2755 | t->name_indx = defaux.vda_name; | |
2756 | ||
2757 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, | |
2758 | (Elf_External_Verdaux *) p); | |
2759 | p += sizeof (Elf_External_Verdaux); | |
2760 | ||
2761 | for (n = t->deps; n != NULL; n = n->next) | |
2762 | { | |
2763 | if (n->version_needed == NULL) | |
2764 | { | |
2765 | /* This can happen if there was an error in the | |
2766 | version script. */ | |
2767 | defaux.vda_name = 0; | |
2768 | } | |
2769 | else | |
2770 | defaux.vda_name = n->version_needed->name_indx; | |
2771 | if (n->next == NULL) | |
2772 | defaux.vda_next = 0; | |
2773 | else | |
2774 | defaux.vda_next = sizeof (Elf_External_Verdaux); | |
2775 | ||
2776 | _bfd_elf_swap_verdaux_out (output_bfd, &defaux, | |
2777 | (Elf_External_Verdaux *) p); | |
2778 | p += sizeof (Elf_External_Verdaux); | |
2779 | } | |
2780 | } | |
2781 | ||
2782 | if (! elf_add_dynamic_entry (info, DT_VERDEF, 0) | |
2783 | || ! elf_add_dynamic_entry (info, DT_VERDEFNUM, cdefs)) | |
2784 | return false; | |
2785 | ||
2786 | elf_tdata (output_bfd)->cverdefs = cdefs; | |
2787 | } | |
2788 | ||
2789 | /* Work out the size of the version reference section. */ | |
2790 | ||
2791 | s = bfd_get_section_by_name (dynobj, ".gnu.version_r"); | |
2792 | BFD_ASSERT (s != NULL); | |
2793 | { | |
2794 | struct elf_find_verdep_info sinfo; | |
2795 | ||
2796 | sinfo.output_bfd = output_bfd; | |
2797 | sinfo.info = info; | |
2798 | sinfo.vers = elf_tdata (output_bfd)->cverdefs; | |
2799 | if (sinfo.vers == 0) | |
2800 | sinfo.vers = 1; | |
2801 | sinfo.failed = false; | |
2802 | ||
2803 | elf_link_hash_traverse (elf_hash_table (info), | |
2804 | elf_link_find_version_dependencies, | |
2805 | (PTR) &sinfo); | |
2806 | ||
2807 | if (elf_tdata (output_bfd)->verref == NULL) | |
2808 | { | |
2809 | asection **spp; | |
2810 | ||
2811 | /* We don't have any version definitions, so we can just | |
2812 | remove the section. */ | |
2813 | ||
2814 | for (spp = &output_bfd->sections; | |
2815 | *spp != s->output_section; | |
2816 | spp = &(*spp)->next) | |
2817 | ; | |
2818 | *spp = s->output_section->next; | |
2819 | --output_bfd->section_count; | |
2820 | } | |
2821 | else | |
2822 | { | |
2823 | Elf_Internal_Verneed *t; | |
2824 | unsigned int size; | |
2825 | unsigned int crefs; | |
2826 | bfd_byte *p; | |
2827 | ||
2828 | /* Build the version definition section. */ | |
2829 | size = 0; | |
2830 | crefs = 0; | |
2831 | for (t = elf_tdata (output_bfd)->verref; | |
2832 | t != NULL; | |
2833 | t = t->vn_nextref) | |
2834 | { | |
2835 | Elf_Internal_Vernaux *a; | |
2836 | ||
2837 | size += sizeof (Elf_External_Verneed); | |
2838 | ++crefs; | |
2839 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) | |
2840 | size += sizeof (Elf_External_Vernaux); | |
2841 | } | |
2842 | ||
2843 | s->_raw_size = size; | |
2844 | s->contents = (bfd_byte *) bfd_alloc (output_bfd, size); | |
2845 | if (s->contents == NULL) | |
2846 | return false; | |
2847 | ||
2848 | p = s->contents; | |
2849 | for (t = elf_tdata (output_bfd)->verref; | |
2850 | t != NULL; | |
2851 | t = t->vn_nextref) | |
2852 | { | |
2853 | unsigned int caux; | |
2854 | Elf_Internal_Vernaux *a; | |
2855 | bfd_size_type indx; | |
2856 | ||
2857 | caux = 0; | |
2858 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) | |
2859 | ++caux; | |
2860 | ||
2861 | t->vn_version = VER_NEED_CURRENT; | |
2862 | t->vn_cnt = caux; | |
2863 | if (elf_dt_name (t->vn_bfd) != NULL) | |
2864 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2865 | elf_dt_name (t->vn_bfd), | |
2866 | true, false); | |
2867 | else | |
2868 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2869 | t->vn_bfd->filename, true, false); | |
2870 | if (indx == (bfd_size_type) -1) | |
2871 | return false; | |
2872 | t->vn_file = indx; | |
2873 | t->vn_aux = sizeof (Elf_External_Verneed); | |
2874 | if (t->vn_nextref == NULL) | |
2875 | t->vn_next = 0; | |
2876 | else | |
2877 | t->vn_next = (sizeof (Elf_External_Verneed) | |
2878 | + caux * sizeof (Elf_External_Vernaux)); | |
2879 | ||
2880 | _bfd_elf_swap_verneed_out (output_bfd, t, | |
2881 | (Elf_External_Verneed *) p); | |
2882 | p += sizeof (Elf_External_Verneed); | |
2883 | ||
2884 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) | |
2885 | { | |
2886 | a->vna_hash = bfd_elf_hash ((const unsigned char *) | |
2887 | a->vna_nodename); | |
2888 | indx = _bfd_stringtab_add (elf_hash_table (info)->dynstr, | |
2889 | a->vna_nodename, true, false); | |
2890 | if (indx == (bfd_size_type) -1) | |
2891 | return false; | |
2892 | a->vna_name = indx; | |
2893 | if (a->vna_nextptr == NULL) | |
2894 | a->vna_next = 0; | |
2895 | else | |
2896 | a->vna_next = sizeof (Elf_External_Vernaux); | |
2897 | ||
2898 | _bfd_elf_swap_vernaux_out (output_bfd, a, | |
2899 | (Elf_External_Vernaux *) p); | |
2900 | p += sizeof (Elf_External_Vernaux); | |
2901 | } | |
2902 | } | |
2903 | ||
2904 | if (! elf_add_dynamic_entry (info, DT_VERNEED, 0) | |
2905 | || ! elf_add_dynamic_entry (info, DT_VERNEEDNUM, crefs)) | |
2906 | return false; | |
2907 | ||
2908 | elf_tdata (output_bfd)->cverrefs = crefs; | |
2909 | } | |
2910 | } | |
2911 | ||
2912 | dynsymcount = elf_hash_table (info)->dynsymcount; | |
2913 | ||
2914 | /* Work out the size of the symbol version section. */ | |
2915 | s = bfd_get_section_by_name (dynobj, ".gnu.version"); | |
2916 | BFD_ASSERT (s != NULL); | |
2917 | if (dynsymcount == 0 | |
2918 | || (verdefs == NULL && elf_tdata (output_bfd)->verref == NULL)) | |
2919 | { | |
2920 | asection **spp; | |
2921 | ||
2922 | /* We don't need any symbol versions; just discard the | |
2923 | section. */ | |
2924 | for (spp = &output_bfd->sections; | |
2925 | *spp != s->output_section; | |
2926 | spp = &(*spp)->next) | |
2927 | ; | |
2928 | *spp = s->output_section->next; | |
2929 | --output_bfd->section_count; | |
2930 | } | |
2931 | else | |
2932 | { | |
2933 | s->_raw_size = dynsymcount * sizeof (Elf_External_Versym); | |
2934 | s->contents = (bfd_byte *) bfd_zalloc (output_bfd, s->_raw_size); | |
2935 | if (s->contents == NULL) | |
2936 | return false; | |
2937 | ||
2938 | if (! elf_add_dynamic_entry (info, DT_VERSYM, 0)) | |
2939 | return false; | |
2940 | } | |
2941 | ||
2942 | /* Set the size of the .dynsym and .hash sections. We counted | |
2943 | the number of dynamic symbols in elf_link_add_object_symbols. | |
2944 | We will build the contents of .dynsym and .hash when we build | |
2945 | the final symbol table, because until then we do not know the | |
2946 | correct value to give the symbols. We built the .dynstr | |
2947 | section as we went along in elf_link_add_object_symbols. */ | |
2948 | s = bfd_get_section_by_name (dynobj, ".dynsym"); | |
2949 | BFD_ASSERT (s != NULL); | |
2950 | s->_raw_size = dynsymcount * sizeof (Elf_External_Sym); | |
2951 | s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size); | |
2952 | if (s->contents == NULL && s->_raw_size != 0) | |
2953 | return false; | |
2954 | ||
2955 | /* The first entry in .dynsym is a dummy symbol. */ | |
2956 | isym.st_value = 0; | |
2957 | isym.st_size = 0; | |
2958 | isym.st_name = 0; | |
2959 | isym.st_info = 0; | |
2960 | isym.st_other = 0; | |
2961 | isym.st_shndx = 0; | |
2962 | elf_swap_symbol_out (output_bfd, &isym, | |
2963 | (PTR) (Elf_External_Sym *) s->contents); | |
2964 | ||
2965 | /* Compute the size of the hashing table. As a side effect this | |
2966 | computes the hash values for all the names we export. */ | |
2967 | bucketcount = compute_bucket_count (info); | |
2968 | ||
2969 | s = bfd_get_section_by_name (dynobj, ".hash"); | |
2970 | BFD_ASSERT (s != NULL); | |
2971 | s->_raw_size = (2 + bucketcount + dynsymcount) * (ARCH_SIZE / 8); | |
2972 | s->contents = (bfd_byte *) bfd_alloc (output_bfd, s->_raw_size); | |
2973 | if (s->contents == NULL) | |
2974 | return false; | |
2975 | memset (s->contents, 0, (size_t) s->_raw_size); | |
2976 | ||
2977 | put_word (output_bfd, bucketcount, s->contents); | |
2978 | put_word (output_bfd, dynsymcount, s->contents + (ARCH_SIZE / 8)); | |
2979 | ||
2980 | elf_hash_table (info)->bucketcount = bucketcount; | |
2981 | ||
2982 | s = bfd_get_section_by_name (dynobj, ".dynstr"); | |
2983 | BFD_ASSERT (s != NULL); | |
2984 | s->_raw_size = _bfd_stringtab_size (elf_hash_table (info)->dynstr); | |
2985 | ||
2986 | if (! elf_add_dynamic_entry (info, DT_NULL, 0)) | |
2987 | return false; | |
2988 | } | |
2989 | ||
2990 | return true; | |
2991 | } | |
2992 | \f | |
2993 | /* Fix up the flags for a symbol. This handles various cases which | |
2994 | can only be fixed after all the input files are seen. This is | |
2995 | currently called by both adjust_dynamic_symbol and | |
2996 | assign_sym_version, which is unnecessary but perhaps more robust in | |
2997 | the face of future changes. */ | |
2998 | ||
2999 | static boolean | |
3000 | elf_fix_symbol_flags (h, eif) | |
3001 | struct elf_link_hash_entry *h; | |
3002 | struct elf_info_failed *eif; | |
3003 | { | |
3004 | /* If this symbol was mentioned in a non-ELF file, try to set | |
3005 | DEF_REGULAR and REF_REGULAR correctly. This is the only way to | |
3006 | permit a non-ELF file to correctly refer to a symbol defined in | |
3007 | an ELF dynamic object. */ | |
3008 | if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0) | |
3009 | { | |
3010 | if (h->root.type != bfd_link_hash_defined | |
3011 | && h->root.type != bfd_link_hash_defweak) | |
3012 | h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR | |
3013 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK); | |
3014 | else | |
3015 | { | |
3016 | if (h->root.u.def.section->owner != NULL | |
3017 | && (bfd_get_flavour (h->root.u.def.section->owner) | |
3018 | == bfd_target_elf_flavour)) | |
3019 | h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR | |
3020 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK); | |
3021 | else | |
3022 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
3023 | } | |
3024 | ||
3025 | if (h->dynindx == -1 | |
3026 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
3027 | || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)) | |
3028 | { | |
3029 | if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h)) | |
3030 | { | |
3031 | eif->failed = true; | |
3032 | return false; | |
3033 | } | |
3034 | } | |
3035 | } | |
3036 | else | |
3037 | { | |
3038 | /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol | |
3039 | was first seen in a non-ELF file. Fortunately, if the symbol | |
3040 | was first seen in an ELF file, we're probably OK unless the | |
3041 | symbol was defined in a non-ELF file. Catch that case here. | |
3042 | FIXME: We're still in trouble if the symbol was first seen in | |
3043 | a dynamic object, and then later in a non-ELF regular object. */ | |
3044 | if ((h->root.type == bfd_link_hash_defined | |
3045 | || h->root.type == bfd_link_hash_defweak) | |
3046 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
3047 | && (h->root.u.def.section->owner != NULL | |
3048 | ? (bfd_get_flavour (h->root.u.def.section->owner) | |
3049 | != bfd_target_elf_flavour) | |
3050 | : (bfd_is_abs_section (h->root.u.def.section) | |
3051 | && (h->elf_link_hash_flags | |
3052 | & ELF_LINK_HASH_DEF_DYNAMIC) == 0))) | |
3053 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
3054 | } | |
3055 | ||
3056 | /* If this is a final link, and the symbol was defined as a common | |
3057 | symbol in a regular object file, and there was no definition in | |
3058 | any dynamic object, then the linker will have allocated space for | |
3059 | the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR | |
3060 | flag will not have been set. */ | |
3061 | if (h->root.type == bfd_link_hash_defined | |
3062 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
3063 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0 | |
3064 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
3065 | && (h->root.u.def.section->owner->flags & DYNAMIC) == 0) | |
3066 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
3067 | ||
3068 | /* If -Bsymbolic was used (which means to bind references to global | |
3069 | symbols to the definition within the shared object), and this | |
3070 | symbol was defined in a regular object, then it actually doesn't | |
3071 | need a PLT entry. */ | |
3072 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0 | |
3073 | && eif->info->shared | |
3074 | && eif->info->symbolic | |
3075 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
3076 | { | |
3077 | h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT; | |
3078 | h->plt.offset = (bfd_vma) -1; | |
3079 | } | |
3080 | ||
3081 | return true; | |
3082 | } | |
3083 | ||
3084 | /* Make the backend pick a good value for a dynamic symbol. This is | |
3085 | called via elf_link_hash_traverse, and also calls itself | |
3086 | recursively. */ | |
3087 | ||
3088 | static boolean | |
3089 | elf_adjust_dynamic_symbol (h, data) | |
3090 | struct elf_link_hash_entry *h; | |
3091 | PTR data; | |
3092 | { | |
3093 | struct elf_info_failed *eif = (struct elf_info_failed *) data; | |
3094 | bfd *dynobj; | |
3095 | struct elf_backend_data *bed; | |
3096 | ||
3097 | /* Ignore indirect symbols. These are added by the versioning code. */ | |
3098 | if (h->root.type == bfd_link_hash_indirect) | |
3099 | return true; | |
3100 | ||
3101 | /* Fix the symbol flags. */ | |
3102 | if (! elf_fix_symbol_flags (h, eif)) | |
3103 | return false; | |
3104 | ||
3105 | /* If this symbol does not require a PLT entry, and it is not | |
3106 | defined by a dynamic object, or is not referenced by a regular | |
3107 | object, ignore it. We do have to handle a weak defined symbol, | |
3108 | even if no regular object refers to it, if we decided to add it | |
3109 | to the dynamic symbol table. FIXME: Do we normally need to worry | |
3110 | about symbols which are defined by one dynamic object and | |
3111 | referenced by another one? */ | |
3112 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0 | |
3113 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
3114 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
3115 | || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0 | |
3116 | && (h->weakdef == NULL || h->weakdef->dynindx == -1)))) | |
3117 | { | |
3118 | h->plt.offset = (bfd_vma) -1; | |
3119 | return true; | |
3120 | } | |
3121 | ||
3122 | /* If we've already adjusted this symbol, don't do it again. This | |
3123 | can happen via a recursive call. */ | |
3124 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0) | |
3125 | return true; | |
3126 | ||
3127 | /* Don't look at this symbol again. Note that we must set this | |
3128 | after checking the above conditions, because we may look at a | |
3129 | symbol once, decide not to do anything, and then get called | |
3130 | recursively later after REF_REGULAR is set below. */ | |
3131 | h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED; | |
3132 | ||
3133 | /* If this is a weak definition, and we know a real definition, and | |
3134 | the real symbol is not itself defined by a regular object file, | |
3135 | then get a good value for the real definition. We handle the | |
3136 | real symbol first, for the convenience of the backend routine. | |
3137 | ||
3138 | Note that there is a confusing case here. If the real definition | |
3139 | is defined by a regular object file, we don't get the real symbol | |
3140 | from the dynamic object, but we do get the weak symbol. If the | |
3141 | processor backend uses a COPY reloc, then if some routine in the | |
3142 | dynamic object changes the real symbol, we will not see that | |
3143 | change in the corresponding weak symbol. This is the way other | |
3144 | ELF linkers work as well, and seems to be a result of the shared | |
3145 | library model. | |
3146 | ||
3147 | I will clarify this issue. Most SVR4 shared libraries define the | |
3148 | variable _timezone and define timezone as a weak synonym. The | |
3149 | tzset call changes _timezone. If you write | |
3150 | extern int timezone; | |
3151 | int _timezone = 5; | |
3152 | int main () { tzset (); printf ("%d %d\n", timezone, _timezone); } | |
3153 | you might expect that, since timezone is a synonym for _timezone, | |
3154 | the same number will print both times. However, if the processor | |
3155 | backend uses a COPY reloc, then actually timezone will be copied | |
3156 | into your process image, and, since you define _timezone | |
3157 | yourself, _timezone will not. Thus timezone and _timezone will | |
3158 | wind up at different memory locations. The tzset call will set | |
3159 | _timezone, leaving timezone unchanged. */ | |
3160 | ||
3161 | if (h->weakdef != NULL) | |
3162 | { | |
3163 | struct elf_link_hash_entry *weakdef; | |
3164 | ||
3165 | BFD_ASSERT (h->root.type == bfd_link_hash_defined | |
3166 | || h->root.type == bfd_link_hash_defweak); | |
3167 | weakdef = h->weakdef; | |
3168 | BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined | |
3169 | || weakdef->root.type == bfd_link_hash_defweak); | |
3170 | BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC); | |
3171 | if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
3172 | { | |
3173 | /* This symbol is defined by a regular object file, so we | |
3174 | will not do anything special. Clear weakdef for the | |
3175 | convenience of the processor backend. */ | |
3176 | h->weakdef = NULL; | |
3177 | } | |
3178 | else | |
3179 | { | |
3180 | /* There is an implicit reference by a regular object file | |
3181 | via the weak symbol. */ | |
3182 | weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR; | |
3183 | if (h->weakdef->elf_link_hash_flags | |
3184 | & ELF_LINK_HASH_REF_REGULAR_NONWEAK) | |
3185 | weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR_NONWEAK; | |
3186 | if (! elf_adjust_dynamic_symbol (weakdef, (PTR) eif)) | |
3187 | return false; | |
3188 | } | |
3189 | } | |
3190 | ||
3191 | /* If a symbol has no type and no size and does not require a PLT | |
3192 | entry, then we are probably about to do the wrong thing here: we | |
3193 | are probably going to create a COPY reloc for an empty object. | |
3194 | This case can arise when a shared object is built with assembly | |
3195 | code, and the assembly code fails to set the symbol type. */ | |
3196 | if (h->size == 0 | |
3197 | && h->type == STT_NOTYPE | |
3198 | && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0) | |
3199 | (*_bfd_error_handler) | |
3200 | (_("warning: type and size of dynamic symbol `%s' are not defined"), | |
3201 | h->root.root.string); | |
3202 | ||
3203 | dynobj = elf_hash_table (eif->info)->dynobj; | |
3204 | bed = get_elf_backend_data (dynobj); | |
3205 | if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h)) | |
3206 | { | |
3207 | eif->failed = true; | |
3208 | return false; | |
3209 | } | |
3210 | ||
3211 | return true; | |
3212 | } | |
3213 | \f | |
3214 | /* This routine is used to export all defined symbols into the dynamic | |
3215 | symbol table. It is called via elf_link_hash_traverse. */ | |
3216 | ||
3217 | static boolean | |
3218 | elf_export_symbol (h, data) | |
3219 | struct elf_link_hash_entry *h; | |
3220 | PTR data; | |
3221 | { | |
3222 | struct elf_info_failed *eif = (struct elf_info_failed *) data; | |
3223 | ||
3224 | /* Ignore indirect symbols. These are added by the versioning code. */ | |
3225 | if (h->root.type == bfd_link_hash_indirect) | |
3226 | return true; | |
3227 | ||
3228 | if (h->dynindx == -1 | |
3229 | && (h->elf_link_hash_flags | |
3230 | & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0) | |
3231 | { | |
3232 | if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h)) | |
3233 | { | |
3234 | eif->failed = true; | |
3235 | return false; | |
3236 | } | |
3237 | } | |
3238 | ||
3239 | return true; | |
3240 | } | |
3241 | \f | |
3242 | /* Look through the symbols which are defined in other shared | |
3243 | libraries and referenced here. Update the list of version | |
3244 | dependencies. This will be put into the .gnu.version_r section. | |
3245 | This function is called via elf_link_hash_traverse. */ | |
3246 | ||
3247 | static boolean | |
3248 | elf_link_find_version_dependencies (h, data) | |
3249 | struct elf_link_hash_entry *h; | |
3250 | PTR data; | |
3251 | { | |
3252 | struct elf_find_verdep_info *rinfo = (struct elf_find_verdep_info *) data; | |
3253 | Elf_Internal_Verneed *t; | |
3254 | Elf_Internal_Vernaux *a; | |
3255 | ||
3256 | /* We only care about symbols defined in shared objects with version | |
3257 | information. */ | |
3258 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
3259 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
3260 | || h->dynindx == -1 | |
3261 | || h->verinfo.verdef == NULL) | |
3262 | return true; | |
3263 | ||
3264 | /* See if we already know about this version. */ | |
3265 | for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref) | |
3266 | { | |
3267 | if (t->vn_bfd != h->verinfo.verdef->vd_bfd) | |
3268 | continue; | |
3269 | ||
3270 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) | |
3271 | if (a->vna_nodename == h->verinfo.verdef->vd_nodename) | |
3272 | return true; | |
3273 | ||
3274 | break; | |
3275 | } | |
3276 | ||
3277 | /* This is a new version. Add it to tree we are building. */ | |
3278 | ||
3279 | if (t == NULL) | |
3280 | { | |
3281 | t = (Elf_Internal_Verneed *) bfd_zalloc (rinfo->output_bfd, sizeof *t); | |
3282 | if (t == NULL) | |
3283 | { | |
3284 | rinfo->failed = true; | |
3285 | return false; | |
3286 | } | |
3287 | ||
3288 | t->vn_bfd = h->verinfo.verdef->vd_bfd; | |
3289 | t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref; | |
3290 | elf_tdata (rinfo->output_bfd)->verref = t; | |
3291 | } | |
3292 | ||
3293 | a = (Elf_Internal_Vernaux *) bfd_zalloc (rinfo->output_bfd, sizeof *a); | |
3294 | ||
3295 | /* Note that we are copying a string pointer here, and testing it | |
3296 | above. If bfd_elf_string_from_elf_section is ever changed to | |
3297 | discard the string data when low in memory, this will have to be | |
3298 | fixed. */ | |
3299 | a->vna_nodename = h->verinfo.verdef->vd_nodename; | |
3300 | ||
3301 | a->vna_flags = h->verinfo.verdef->vd_flags; | |
3302 | a->vna_nextptr = t->vn_auxptr; | |
3303 | ||
3304 | h->verinfo.verdef->vd_exp_refno = rinfo->vers; | |
3305 | ++rinfo->vers; | |
3306 | ||
3307 | a->vna_other = h->verinfo.verdef->vd_exp_refno + 1; | |
3308 | ||
3309 | t->vn_auxptr = a; | |
3310 | ||
3311 | return true; | |
3312 | } | |
3313 | ||
3314 | /* Figure out appropriate versions for all the symbols. We may not | |
3315 | have the version number script until we have read all of the input | |
3316 | files, so until that point we don't know which symbols should be | |
3317 | local. This function is called via elf_link_hash_traverse. */ | |
3318 | ||
3319 | static boolean | |
3320 | elf_link_assign_sym_version (h, data) | |
3321 | struct elf_link_hash_entry *h; | |
3322 | PTR data; | |
3323 | { | |
3324 | struct elf_assign_sym_version_info *sinfo = | |
3325 | (struct elf_assign_sym_version_info *) data; | |
3326 | struct bfd_link_info *info = sinfo->info; | |
3327 | struct elf_info_failed eif; | |
3328 | char *p; | |
3329 | ||
3330 | /* Fix the symbol flags. */ | |
3331 | eif.failed = false; | |
3332 | eif.info = info; | |
3333 | if (! elf_fix_symbol_flags (h, &eif)) | |
3334 | { | |
3335 | if (eif.failed) | |
3336 | sinfo->failed = true; | |
3337 | return false; | |
3338 | } | |
3339 | ||
3340 | /* We only need version numbers for symbols defined in regular | |
3341 | objects. */ | |
3342 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
3343 | return true; | |
3344 | ||
3345 | p = strchr (h->root.root.string, ELF_VER_CHR); | |
3346 | if (p != NULL && h->verinfo.vertree == NULL) | |
3347 | { | |
3348 | struct bfd_elf_version_tree *t; | |
3349 | boolean hidden; | |
3350 | ||
3351 | hidden = true; | |
3352 | ||
3353 | /* There are two consecutive ELF_VER_CHR characters if this is | |
3354 | not a hidden symbol. */ | |
3355 | ++p; | |
3356 | if (*p == ELF_VER_CHR) | |
3357 | { | |
3358 | hidden = false; | |
3359 | ++p; | |
3360 | } | |
3361 | ||
3362 | /* If there is no version string, we can just return out. */ | |
3363 | if (*p == '\0') | |
3364 | { | |
3365 | if (hidden) | |
3366 | h->elf_link_hash_flags |= ELF_LINK_HIDDEN; | |
3367 | return true; | |
3368 | } | |
3369 | ||
3370 | /* Look for the version. If we find it, it is no longer weak. */ | |
3371 | for (t = sinfo->verdefs; t != NULL; t = t->next) | |
3372 | { | |
3373 | if (strcmp (t->name, p) == 0) | |
3374 | { | |
3375 | int len; | |
3376 | char *alc; | |
3377 | struct bfd_elf_version_expr *d; | |
3378 | ||
3379 | len = p - h->root.root.string; | |
3380 | alc = bfd_alloc (sinfo->output_bfd, len); | |
3381 | if (alc == NULL) | |
3382 | return false; | |
3383 | strncpy (alc, h->root.root.string, len - 1); | |
3384 | alc[len - 1] = '\0'; | |
3385 | if (alc[len - 2] == ELF_VER_CHR) | |
3386 | alc[len - 2] = '\0'; | |
3387 | ||
3388 | h->verinfo.vertree = t; | |
3389 | t->used = true; | |
3390 | d = NULL; | |
3391 | ||
3392 | if (t->globals != NULL) | |
3393 | { | |
3394 | for (d = t->globals; d != NULL; d = d->next) | |
3395 | if ((*d->match) (d, alc)) | |
3396 | break; | |
3397 | } | |
3398 | ||
3399 | /* See if there is anything to force this symbol to | |
3400 | local scope. */ | |
3401 | if (d == NULL && t->locals != NULL) | |
3402 | { | |
3403 | for (d = t->locals; d != NULL; d = d->next) | |
3404 | { | |
3405 | if ((*d->match) (d, alc)) | |
3406 | { | |
3407 | if (h->dynindx != -1 | |
3408 | && info->shared | |
3409 | && ! sinfo->export_dynamic) | |
3410 | { | |
3411 | sinfo->removed_dynamic = true; | |
3412 | h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL; | |
3413 | h->elf_link_hash_flags &=~ | |
3414 | ELF_LINK_HASH_NEEDS_PLT; | |
3415 | h->dynindx = -1; | |
3416 | h->plt.offset = (bfd_vma) -1; | |
3417 | /* FIXME: The name of the symbol has | |
3418 | already been recorded in the dynamic | |
3419 | string table section. */ | |
3420 | } | |
3421 | ||
3422 | break; | |
3423 | } | |
3424 | } | |
3425 | } | |
3426 | ||
3427 | bfd_release (sinfo->output_bfd, alc); | |
3428 | break; | |
3429 | } | |
3430 | } | |
3431 | ||
3432 | /* If we are building an application, we need to create a | |
3433 | version node for this version. */ | |
3434 | if (t == NULL && ! info->shared) | |
3435 | { | |
3436 | struct bfd_elf_version_tree **pp; | |
3437 | int version_index; | |
3438 | ||
3439 | /* If we aren't going to export this symbol, we don't need | |
3440 | to worry about it. */ | |
3441 | if (h->dynindx == -1) | |
3442 | return true; | |
3443 | ||
3444 | t = ((struct bfd_elf_version_tree *) | |
3445 | bfd_alloc (sinfo->output_bfd, sizeof *t)); | |
3446 | if (t == NULL) | |
3447 | { | |
3448 | sinfo->failed = true; | |
3449 | return false; | |
3450 | } | |
3451 | ||
3452 | t->next = NULL; | |
3453 | t->name = p; | |
3454 | t->globals = NULL; | |
3455 | t->locals = NULL; | |
3456 | t->deps = NULL; | |
3457 | t->name_indx = (unsigned int) -1; | |
3458 | t->used = true; | |
3459 | ||
3460 | version_index = 1; | |
3461 | for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next) | |
3462 | ++version_index; | |
3463 | t->vernum = version_index; | |
3464 | ||
3465 | *pp = t; | |
3466 | ||
3467 | h->verinfo.vertree = t; | |
3468 | } | |
3469 | else if (t == NULL) | |
3470 | { | |
3471 | /* We could not find the version for a symbol when | |
3472 | generating a shared archive. Return an error. */ | |
3473 | (*_bfd_error_handler) | |
3474 | (_("%s: undefined versioned symbol name %s"), | |
3475 | bfd_get_filename (sinfo->output_bfd), h->root.root.string); | |
3476 | bfd_set_error (bfd_error_bad_value); | |
3477 | sinfo->failed = true; | |
3478 | return false; | |
3479 | } | |
3480 | ||
3481 | if (hidden) | |
3482 | h->elf_link_hash_flags |= ELF_LINK_HIDDEN; | |
3483 | } | |
3484 | ||
3485 | /* If we don't have a version for this symbol, see if we can find | |
3486 | something. */ | |
3487 | if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL) | |
3488 | { | |
3489 | struct bfd_elf_version_tree *t; | |
3490 | struct bfd_elf_version_tree *deflt; | |
3491 | struct bfd_elf_version_expr *d; | |
3492 | ||
3493 | /* See if can find what version this symbol is in. If the | |
3494 | symbol is supposed to be local, then don't actually register | |
3495 | it. */ | |
3496 | deflt = NULL; | |
3497 | for (t = sinfo->verdefs; t != NULL; t = t->next) | |
3498 | { | |
3499 | if (t->globals != NULL) | |
3500 | { | |
3501 | for (d = t->globals; d != NULL; d = d->next) | |
3502 | { | |
3503 | if ((*d->match) (d, h->root.root.string)) | |
3504 | { | |
3505 | h->verinfo.vertree = t; | |
3506 | break; | |
3507 | } | |
3508 | } | |
3509 | ||
3510 | if (d != NULL) | |
3511 | break; | |
3512 | } | |
3513 | ||
3514 | if (t->locals != NULL) | |
3515 | { | |
3516 | for (d = t->locals; d != NULL; d = d->next) | |
3517 | { | |
3518 | if (d->pattern[0] == '*' && d->pattern[1] == '\0') | |
3519 | deflt = t; | |
3520 | else if ((*d->match) (d, h->root.root.string)) | |
3521 | { | |
3522 | h->verinfo.vertree = t; | |
3523 | if (h->dynindx != -1 | |
3524 | && info->shared | |
3525 | && ! sinfo->export_dynamic) | |
3526 | { | |
3527 | sinfo->removed_dynamic = true; | |
3528 | h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL; | |
3529 | h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT; | |
3530 | h->dynindx = -1; | |
3531 | h->plt.offset = (bfd_vma) -1; | |
3532 | /* FIXME: The name of the symbol has already | |
3533 | been recorded in the dynamic string table | |
3534 | section. */ | |
3535 | } | |
3536 | break; | |
3537 | } | |
3538 | } | |
3539 | ||
3540 | if (d != NULL) | |
3541 | break; | |
3542 | } | |
3543 | } | |
3544 | ||
3545 | if (deflt != NULL && h->verinfo.vertree == NULL) | |
3546 | { | |
3547 | h->verinfo.vertree = deflt; | |
3548 | if (h->dynindx != -1 | |
3549 | && info->shared | |
3550 | && ! sinfo->export_dynamic) | |
3551 | { | |
3552 | sinfo->removed_dynamic = true; | |
3553 | h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL; | |
3554 | h->elf_link_hash_flags &=~ ELF_LINK_HASH_NEEDS_PLT; | |
3555 | h->dynindx = -1; | |
3556 | h->plt.offset = (bfd_vma) -1; | |
3557 | /* FIXME: The name of the symbol has already been | |
3558 | recorded in the dynamic string table section. */ | |
3559 | } | |
3560 | } | |
3561 | } | |
3562 | ||
3563 | return true; | |
3564 | } | |
3565 | ||
3566 | /* This function is used to renumber the dynamic symbols, if some of | |
3567 | them are removed because they are marked as local. This is called | |
3568 | via elf_link_hash_traverse. */ | |
3569 | ||
3570 | static boolean | |
3571 | elf_link_renumber_dynsyms (h, data) | |
3572 | struct elf_link_hash_entry *h; | |
3573 | PTR data; | |
3574 | { | |
3575 | struct bfd_link_info *info = (struct bfd_link_info *) data; | |
3576 | ||
3577 | if (h->dynindx != -1) | |
3578 | { | |
3579 | h->dynindx = elf_hash_table (info)->dynsymcount; | |
3580 | ++elf_hash_table (info)->dynsymcount; | |
3581 | } | |
3582 | ||
3583 | return true; | |
3584 | } | |
3585 | \f | |
3586 | /* Final phase of ELF linker. */ | |
3587 | ||
3588 | /* A structure we use to avoid passing large numbers of arguments. */ | |
3589 | ||
3590 | struct elf_final_link_info | |
3591 | { | |
3592 | /* General link information. */ | |
3593 | struct bfd_link_info *info; | |
3594 | /* Output BFD. */ | |
3595 | bfd *output_bfd; | |
3596 | /* Symbol string table. */ | |
3597 | struct bfd_strtab_hash *symstrtab; | |
3598 | /* .dynsym section. */ | |
3599 | asection *dynsym_sec; | |
3600 | /* .hash section. */ | |
3601 | asection *hash_sec; | |
3602 | /* symbol version section (.gnu.version). */ | |
3603 | asection *symver_sec; | |
3604 | /* Buffer large enough to hold contents of any section. */ | |
3605 | bfd_byte *contents; | |
3606 | /* Buffer large enough to hold external relocs of any section. */ | |
3607 | PTR external_relocs; | |
3608 | /* Buffer large enough to hold internal relocs of any section. */ | |
3609 | Elf_Internal_Rela *internal_relocs; | |
3610 | /* Buffer large enough to hold external local symbols of any input | |
3611 | BFD. */ | |
3612 | Elf_External_Sym *external_syms; | |
3613 | /* Buffer large enough to hold internal local symbols of any input | |
3614 | BFD. */ | |
3615 | Elf_Internal_Sym *internal_syms; | |
3616 | /* Array large enough to hold a symbol index for each local symbol | |
3617 | of any input BFD. */ | |
3618 | long *indices; | |
3619 | /* Array large enough to hold a section pointer for each local | |
3620 | symbol of any input BFD. */ | |
3621 | asection **sections; | |
3622 | /* Buffer to hold swapped out symbols. */ | |
3623 | Elf_External_Sym *symbuf; | |
3624 | /* Number of swapped out symbols in buffer. */ | |
3625 | size_t symbuf_count; | |
3626 | /* Number of symbols which fit in symbuf. */ | |
3627 | size_t symbuf_size; | |
3628 | }; | |
3629 | ||
3630 | static boolean elf_link_output_sym | |
3631 | PARAMS ((struct elf_final_link_info *, const char *, | |
3632 | Elf_Internal_Sym *, asection *)); | |
3633 | static boolean elf_link_flush_output_syms | |
3634 | PARAMS ((struct elf_final_link_info *)); | |
3635 | static boolean elf_link_output_extsym | |
3636 | PARAMS ((struct elf_link_hash_entry *, PTR)); | |
3637 | static boolean elf_link_input_bfd | |
3638 | PARAMS ((struct elf_final_link_info *, bfd *)); | |
3639 | static boolean elf_reloc_link_order | |
3640 | PARAMS ((bfd *, struct bfd_link_info *, asection *, | |
3641 | struct bfd_link_order *)); | |
3642 | ||
3643 | /* This struct is used to pass information to elf_link_output_extsym. */ | |
3644 | ||
3645 | struct elf_outext_info | |
3646 | { | |
3647 | boolean failed; | |
3648 | boolean localsyms; | |
3649 | struct elf_final_link_info *finfo; | |
3650 | }; | |
3651 | ||
3652 | /* Do the final step of an ELF link. */ | |
3653 | ||
3654 | boolean | |
3655 | elf_bfd_final_link (abfd, info) | |
3656 | bfd *abfd; | |
3657 | struct bfd_link_info *info; | |
3658 | { | |
3659 | boolean dynamic; | |
3660 | bfd *dynobj; | |
3661 | struct elf_final_link_info finfo; | |
3662 | register asection *o; | |
3663 | register struct bfd_link_order *p; | |
3664 | register bfd *sub; | |
3665 | size_t max_contents_size; | |
3666 | size_t max_external_reloc_size; | |
3667 | size_t max_internal_reloc_count; | |
3668 | size_t max_sym_count; | |
3669 | file_ptr off; | |
3670 | Elf_Internal_Sym elfsym; | |
3671 | unsigned int i; | |
3672 | Elf_Internal_Shdr *symtab_hdr; | |
3673 | Elf_Internal_Shdr *symstrtab_hdr; | |
3674 | struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
3675 | struct elf_outext_info eoinfo; | |
3676 | ||
3677 | if (info->shared) | |
3678 | abfd->flags |= DYNAMIC; | |
3679 | ||
3680 | dynamic = elf_hash_table (info)->dynamic_sections_created; | |
3681 | dynobj = elf_hash_table (info)->dynobj; | |
3682 | ||
3683 | finfo.info = info; | |
3684 | finfo.output_bfd = abfd; | |
3685 | finfo.symstrtab = elf_stringtab_init (); | |
3686 | if (finfo.symstrtab == NULL) | |
3687 | return false; | |
3688 | ||
3689 | if (! dynamic) | |
3690 | { | |
3691 | finfo.dynsym_sec = NULL; | |
3692 | finfo.hash_sec = NULL; | |
3693 | finfo.symver_sec = NULL; | |
3694 | } | |
3695 | else | |
3696 | { | |
3697 | finfo.dynsym_sec = bfd_get_section_by_name (dynobj, ".dynsym"); | |
3698 | finfo.hash_sec = bfd_get_section_by_name (dynobj, ".hash"); | |
3699 | BFD_ASSERT (finfo.dynsym_sec != NULL && finfo.hash_sec != NULL); | |
3700 | finfo.symver_sec = bfd_get_section_by_name (dynobj, ".gnu.version"); | |
3701 | /* Note that it is OK if symver_sec is NULL. */ | |
3702 | } | |
3703 | ||
3704 | finfo.contents = NULL; | |
3705 | finfo.external_relocs = NULL; | |
3706 | finfo.internal_relocs = NULL; | |
3707 | finfo.external_syms = NULL; | |
3708 | finfo.internal_syms = NULL; | |
3709 | finfo.indices = NULL; | |
3710 | finfo.sections = NULL; | |
3711 | finfo.symbuf = NULL; | |
3712 | finfo.symbuf_count = 0; | |
3713 | ||
3714 | /* Count up the number of relocations we will output for each output | |
3715 | section, so that we know the sizes of the reloc sections. We | |
3716 | also figure out some maximum sizes. */ | |
3717 | max_contents_size = 0; | |
3718 | max_external_reloc_size = 0; | |
3719 | max_internal_reloc_count = 0; | |
3720 | max_sym_count = 0; | |
3721 | for (o = abfd->sections; o != (asection *) NULL; o = o->next) | |
3722 | { | |
3723 | o->reloc_count = 0; | |
3724 | ||
3725 | for (p = o->link_order_head; p != NULL; p = p->next) | |
3726 | { | |
3727 | if (p->type == bfd_section_reloc_link_order | |
3728 | || p->type == bfd_symbol_reloc_link_order) | |
3729 | ++o->reloc_count; | |
3730 | else if (p->type == bfd_indirect_link_order) | |
3731 | { | |
3732 | asection *sec; | |
3733 | ||
3734 | sec = p->u.indirect.section; | |
3735 | ||
3736 | /* Mark all sections which are to be included in the | |
3737 | link. This will normally be every section. We need | |
3738 | to do this so that we can identify any sections which | |
3739 | the linker has decided to not include. */ | |
3740 | sec->linker_mark = true; | |
3741 | ||
3742 | if (info->relocateable) | |
3743 | o->reloc_count += sec->reloc_count; | |
3744 | ||
3745 | if (sec->_raw_size > max_contents_size) | |
3746 | max_contents_size = sec->_raw_size; | |
3747 | if (sec->_cooked_size > max_contents_size) | |
3748 | max_contents_size = sec->_cooked_size; | |
3749 | ||
3750 | /* We are interested in just local symbols, not all | |
3751 | symbols. */ | |
3752 | if (bfd_get_flavour (sec->owner) == bfd_target_elf_flavour | |
3753 | && (sec->owner->flags & DYNAMIC) == 0) | |
3754 | { | |
3755 | size_t sym_count; | |
3756 | ||
3757 | if (elf_bad_symtab (sec->owner)) | |
3758 | sym_count = (elf_tdata (sec->owner)->symtab_hdr.sh_size | |
3759 | / sizeof (Elf_External_Sym)); | |
3760 | else | |
3761 | sym_count = elf_tdata (sec->owner)->symtab_hdr.sh_info; | |
3762 | ||
3763 | if (sym_count > max_sym_count) | |
3764 | max_sym_count = sym_count; | |
3765 | ||
3766 | if ((sec->flags & SEC_RELOC) != 0) | |
3767 | { | |
3768 | size_t ext_size; | |
3769 | ||
3770 | ext_size = elf_section_data (sec)->rel_hdr.sh_size; | |
3771 | if (ext_size > max_external_reloc_size) | |
3772 | max_external_reloc_size = ext_size; | |
3773 | if (sec->reloc_count > max_internal_reloc_count) | |
3774 | max_internal_reloc_count = sec->reloc_count; | |
3775 | } | |
3776 | } | |
3777 | } | |
3778 | } | |
3779 | ||
3780 | if (o->reloc_count > 0) | |
3781 | o->flags |= SEC_RELOC; | |
3782 | else | |
3783 | { | |
3784 | /* Explicitly clear the SEC_RELOC flag. The linker tends to | |
3785 | set it (this is probably a bug) and if it is set | |
3786 | assign_section_numbers will create a reloc section. */ | |
3787 | o->flags &=~ SEC_RELOC; | |
3788 | } | |
3789 | ||
3790 | /* If the SEC_ALLOC flag is not set, force the section VMA to | |
3791 | zero. This is done in elf_fake_sections as well, but forcing | |
3792 | the VMA to 0 here will ensure that relocs against these | |
3793 | sections are handled correctly. */ | |
3794 | if ((o->flags & SEC_ALLOC) == 0 | |
3795 | && ! o->user_set_vma) | |
3796 | o->vma = 0; | |
3797 | } | |
3798 | ||
3799 | /* Figure out the file positions for everything but the symbol table | |
3800 | and the relocs. We set symcount to force assign_section_numbers | |
3801 | to create a symbol table. */ | |
3802 | bfd_get_symcount (abfd) = info->strip == strip_all ? 0 : 1; | |
3803 | BFD_ASSERT (! abfd->output_has_begun); | |
3804 | if (! _bfd_elf_compute_section_file_positions (abfd, info)) | |
3805 | goto error_return; | |
3806 | ||
3807 | /* That created the reloc sections. Set their sizes, and assign | |
3808 | them file positions, and allocate some buffers. */ | |
3809 | for (o = abfd->sections; o != NULL; o = o->next) | |
3810 | { | |
3811 | if ((o->flags & SEC_RELOC) != 0) | |
3812 | { | |
3813 | Elf_Internal_Shdr *rel_hdr; | |
3814 | register struct elf_link_hash_entry **p, **pend; | |
3815 | ||
3816 | rel_hdr = &elf_section_data (o)->rel_hdr; | |
3817 | ||
3818 | rel_hdr->sh_size = rel_hdr->sh_entsize * o->reloc_count; | |
3819 | ||
3820 | /* The contents field must last into write_object_contents, | |
3821 | so we allocate it with bfd_alloc rather than malloc. */ | |
3822 | rel_hdr->contents = (PTR) bfd_alloc (abfd, rel_hdr->sh_size); | |
3823 | if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0) | |
3824 | goto error_return; | |
3825 | ||
3826 | p = ((struct elf_link_hash_entry **) | |
3827 | bfd_malloc (o->reloc_count | |
3828 | * sizeof (struct elf_link_hash_entry *))); | |
3829 | if (p == NULL && o->reloc_count != 0) | |
3830 | goto error_return; | |
3831 | elf_section_data (o)->rel_hashes = p; | |
3832 | pend = p + o->reloc_count; | |
3833 | for (; p < pend; p++) | |
3834 | *p = NULL; | |
3835 | ||
3836 | /* Use the reloc_count field as an index when outputting the | |
3837 | relocs. */ | |
3838 | o->reloc_count = 0; | |
3839 | } | |
3840 | } | |
3841 | ||
3842 | _bfd_elf_assign_file_positions_for_relocs (abfd); | |
3843 | ||
3844 | /* We have now assigned file positions for all the sections except | |
3845 | .symtab and .strtab. We start the .symtab section at the current | |
3846 | file position, and write directly to it. We build the .strtab | |
3847 | section in memory. */ | |
3848 | bfd_get_symcount (abfd) = 0; | |
3849 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; | |
3850 | /* sh_name is set in prep_headers. */ | |
3851 | symtab_hdr->sh_type = SHT_SYMTAB; | |
3852 | symtab_hdr->sh_flags = 0; | |
3853 | symtab_hdr->sh_addr = 0; | |
3854 | symtab_hdr->sh_size = 0; | |
3855 | symtab_hdr->sh_entsize = sizeof (Elf_External_Sym); | |
3856 | /* sh_link is set in assign_section_numbers. */ | |
3857 | /* sh_info is set below. */ | |
3858 | /* sh_offset is set just below. */ | |
3859 | symtab_hdr->sh_addralign = 4; /* FIXME: system dependent? */ | |
3860 | ||
3861 | off = elf_tdata (abfd)->next_file_pos; | |
3862 | off = _bfd_elf_assign_file_position_for_section (symtab_hdr, off, true); | |
3863 | ||
3864 | /* Note that at this point elf_tdata (abfd)->next_file_pos is | |
3865 | incorrect. We do not yet know the size of the .symtab section. | |
3866 | We correct next_file_pos below, after we do know the size. */ | |
3867 | ||
3868 | /* Allocate a buffer to hold swapped out symbols. This is to avoid | |
3869 | continuously seeking to the right position in the file. */ | |
3870 | if (! info->keep_memory || max_sym_count < 20) | |
3871 | finfo.symbuf_size = 20; | |
3872 | else | |
3873 | finfo.symbuf_size = max_sym_count; | |
3874 | finfo.symbuf = ((Elf_External_Sym *) | |
3875 | bfd_malloc (finfo.symbuf_size * sizeof (Elf_External_Sym))); | |
3876 | if (finfo.symbuf == NULL) | |
3877 | goto error_return; | |
3878 | ||
3879 | /* Start writing out the symbol table. The first symbol is always a | |
3880 | dummy symbol. */ | |
3881 | if (info->strip != strip_all || info->relocateable) | |
3882 | { | |
3883 | elfsym.st_value = 0; | |
3884 | elfsym.st_size = 0; | |
3885 | elfsym.st_info = 0; | |
3886 | elfsym.st_other = 0; | |
3887 | elfsym.st_shndx = SHN_UNDEF; | |
3888 | if (! elf_link_output_sym (&finfo, (const char *) NULL, | |
3889 | &elfsym, bfd_und_section_ptr)) | |
3890 | goto error_return; | |
3891 | } | |
3892 | ||
3893 | #if 0 | |
3894 | /* Some standard ELF linkers do this, but we don't because it causes | |
3895 | bootstrap comparison failures. */ | |
3896 | /* Output a file symbol for the output file as the second symbol. | |
3897 | We output this even if we are discarding local symbols, although | |
3898 | I'm not sure if this is correct. */ | |
3899 | elfsym.st_value = 0; | |
3900 | elfsym.st_size = 0; | |
3901 | elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_FILE); | |
3902 | elfsym.st_other = 0; | |
3903 | elfsym.st_shndx = SHN_ABS; | |
3904 | if (! elf_link_output_sym (&finfo, bfd_get_filename (abfd), | |
3905 | &elfsym, bfd_abs_section_ptr)) | |
3906 | goto error_return; | |
3907 | #endif | |
3908 | ||
3909 | /* Output a symbol for each section. We output these even if we are | |
3910 | discarding local symbols, since they are used for relocs. These | |
3911 | symbols have no names. We store the index of each one in the | |
3912 | index field of the section, so that we can find it again when | |
3913 | outputting relocs. */ | |
3914 | if (info->strip != strip_all || info->relocateable) | |
3915 | { | |
3916 | elfsym.st_size = 0; | |
3917 | elfsym.st_info = ELF_ST_INFO (STB_LOCAL, STT_SECTION); | |
3918 | elfsym.st_other = 0; | |
3919 | for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++) | |
3920 | { | |
3921 | o = section_from_elf_index (abfd, i); | |
3922 | if (o != NULL) | |
3923 | o->target_index = bfd_get_symcount (abfd); | |
3924 | elfsym.st_shndx = i; | |
3925 | if (info->relocateable || o == NULL) | |
3926 | elfsym.st_value = 0; | |
3927 | else | |
3928 | elfsym.st_value = o->vma; | |
3929 | if (! elf_link_output_sym (&finfo, (const char *) NULL, | |
3930 | &elfsym, o)) | |
3931 | goto error_return; | |
3932 | } | |
3933 | } | |
3934 | ||
3935 | /* Allocate some memory to hold information read in from the input | |
3936 | files. */ | |
3937 | finfo.contents = (bfd_byte *) bfd_malloc (max_contents_size); | |
3938 | finfo.external_relocs = (PTR) bfd_malloc (max_external_reloc_size); | |
3939 | finfo.internal_relocs = ((Elf_Internal_Rela *) | |
3940 | bfd_malloc (max_internal_reloc_count | |
3941 | * sizeof (Elf_Internal_Rela))); | |
3942 | finfo.external_syms = ((Elf_External_Sym *) | |
3943 | bfd_malloc (max_sym_count | |
3944 | * sizeof (Elf_External_Sym))); | |
3945 | finfo.internal_syms = ((Elf_Internal_Sym *) | |
3946 | bfd_malloc (max_sym_count | |
3947 | * sizeof (Elf_Internal_Sym))); | |
3948 | finfo.indices = (long *) bfd_malloc (max_sym_count * sizeof (long)); | |
3949 | finfo.sections = ((asection **) | |
3950 | bfd_malloc (max_sym_count * sizeof (asection *))); | |
3951 | if ((finfo.contents == NULL && max_contents_size != 0) | |
3952 | || (finfo.external_relocs == NULL && max_external_reloc_size != 0) | |
3953 | || (finfo.internal_relocs == NULL && max_internal_reloc_count != 0) | |
3954 | || (finfo.external_syms == NULL && max_sym_count != 0) | |
3955 | || (finfo.internal_syms == NULL && max_sym_count != 0) | |
3956 | || (finfo.indices == NULL && max_sym_count != 0) | |
3957 | || (finfo.sections == NULL && max_sym_count != 0)) | |
3958 | goto error_return; | |
3959 | ||
3960 | /* Since ELF permits relocations to be against local symbols, we | |
3961 | must have the local symbols available when we do the relocations. | |
3962 | Since we would rather only read the local symbols once, and we | |
3963 | would rather not keep them in memory, we handle all the | |
3964 | relocations for a single input file at the same time. | |
3965 | ||
3966 | Unfortunately, there is no way to know the total number of local | |
3967 | symbols until we have seen all of them, and the local symbol | |
3968 | indices precede the global symbol indices. This means that when | |
3969 | we are generating relocateable output, and we see a reloc against | |
3970 | a global symbol, we can not know the symbol index until we have | |
3971 | finished examining all the local symbols to see which ones we are | |
3972 | going to output. To deal with this, we keep the relocations in | |
3973 | memory, and don't output them until the end of the link. This is | |
3974 | an unfortunate waste of memory, but I don't see a good way around | |
3975 | it. Fortunately, it only happens when performing a relocateable | |
3976 | link, which is not the common case. FIXME: If keep_memory is set | |
3977 | we could write the relocs out and then read them again; I don't | |
3978 | know how bad the memory loss will be. */ | |
3979 | ||
3980 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) | |
3981 | sub->output_has_begun = false; | |
3982 | for (o = abfd->sections; o != NULL; o = o->next) | |
3983 | { | |
3984 | for (p = o->link_order_head; p != NULL; p = p->next) | |
3985 | { | |
3986 | if (p->type == bfd_indirect_link_order | |
3987 | && (bfd_get_flavour (p->u.indirect.section->owner) | |
3988 | == bfd_target_elf_flavour)) | |
3989 | { | |
3990 | sub = p->u.indirect.section->owner; | |
3991 | if (! sub->output_has_begun) | |
3992 | { | |
3993 | if (! elf_link_input_bfd (&finfo, sub)) | |
3994 | goto error_return; | |
3995 | sub->output_has_begun = true; | |
3996 | } | |
3997 | } | |
3998 | else if (p->type == bfd_section_reloc_link_order | |
3999 | || p->type == bfd_symbol_reloc_link_order) | |
4000 | { | |
4001 | if (! elf_reloc_link_order (abfd, info, o, p)) | |
4002 | goto error_return; | |
4003 | } | |
4004 | else | |
4005 | { | |
4006 | if (! _bfd_default_link_order (abfd, info, o, p)) | |
4007 | goto error_return; | |
4008 | } | |
4009 | } | |
4010 | } | |
4011 | ||
4012 | /* That wrote out all the local symbols. Finish up the symbol table | |
4013 | with the global symbols. */ | |
4014 | ||
4015 | if (info->strip != strip_all && info->shared) | |
4016 | { | |
4017 | /* Output any global symbols that got converted to local in a | |
4018 | version script. We do this in a separate step since ELF | |
4019 | requires all local symbols to appear prior to any global | |
4020 | symbols. FIXME: We should only do this if some global | |
4021 | symbols were, in fact, converted to become local. FIXME: | |
4022 | Will this work correctly with the Irix 5 linker? */ | |
4023 | eoinfo.failed = false; | |
4024 | eoinfo.finfo = &finfo; | |
4025 | eoinfo.localsyms = true; | |
4026 | elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym, | |
4027 | (PTR) &eoinfo); | |
4028 | if (eoinfo.failed) | |
4029 | return false; | |
4030 | } | |
4031 | ||
4032 | /* The sh_info field records the index of the first non local | |
4033 | symbol. */ | |
4034 | symtab_hdr->sh_info = bfd_get_symcount (abfd); | |
4035 | if (dynamic) | |
4036 | elf_section_data (finfo.dynsym_sec->output_section)->this_hdr.sh_info = 1; | |
4037 | ||
4038 | /* We get the global symbols from the hash table. */ | |
4039 | eoinfo.failed = false; | |
4040 | eoinfo.localsyms = false; | |
4041 | eoinfo.finfo = &finfo; | |
4042 | elf_link_hash_traverse (elf_hash_table (info), elf_link_output_extsym, | |
4043 | (PTR) &eoinfo); | |
4044 | if (eoinfo.failed) | |
4045 | return false; | |
4046 | ||
4047 | /* Flush all symbols to the file. */ | |
4048 | if (! elf_link_flush_output_syms (&finfo)) | |
4049 | return false; | |
4050 | ||
4051 | /* Now we know the size of the symtab section. */ | |
4052 | off += symtab_hdr->sh_size; | |
4053 | ||
4054 | /* Finish up and write out the symbol string table (.strtab) | |
4055 | section. */ | |
4056 | symstrtab_hdr = &elf_tdata (abfd)->strtab_hdr; | |
4057 | /* sh_name was set in prep_headers. */ | |
4058 | symstrtab_hdr->sh_type = SHT_STRTAB; | |
4059 | symstrtab_hdr->sh_flags = 0; | |
4060 | symstrtab_hdr->sh_addr = 0; | |
4061 | symstrtab_hdr->sh_size = _bfd_stringtab_size (finfo.symstrtab); | |
4062 | symstrtab_hdr->sh_entsize = 0; | |
4063 | symstrtab_hdr->sh_link = 0; | |
4064 | symstrtab_hdr->sh_info = 0; | |
4065 | /* sh_offset is set just below. */ | |
4066 | symstrtab_hdr->sh_addralign = 1; | |
4067 | ||
4068 | off = _bfd_elf_assign_file_position_for_section (symstrtab_hdr, off, true); | |
4069 | elf_tdata (abfd)->next_file_pos = off; | |
4070 | ||
4071 | if (bfd_get_symcount (abfd) > 0) | |
4072 | { | |
4073 | if (bfd_seek (abfd, symstrtab_hdr->sh_offset, SEEK_SET) != 0 | |
4074 | || ! _bfd_stringtab_emit (abfd, finfo.symstrtab)) | |
4075 | return false; | |
4076 | } | |
4077 | ||
4078 | /* Adjust the relocs to have the correct symbol indices. */ | |
4079 | for (o = abfd->sections; o != NULL; o = o->next) | |
4080 | { | |
4081 | struct elf_link_hash_entry **rel_hash; | |
4082 | Elf_Internal_Shdr *rel_hdr; | |
4083 | ||
4084 | if ((o->flags & SEC_RELOC) == 0) | |
4085 | continue; | |
4086 | ||
4087 | rel_hash = elf_section_data (o)->rel_hashes; | |
4088 | rel_hdr = &elf_section_data (o)->rel_hdr; | |
4089 | for (i = 0; i < o->reloc_count; i++, rel_hash++) | |
4090 | { | |
4091 | if (*rel_hash == NULL) | |
4092 | continue; | |
4093 | ||
4094 | BFD_ASSERT ((*rel_hash)->indx >= 0); | |
4095 | ||
4096 | if (rel_hdr->sh_entsize == sizeof (Elf_External_Rel)) | |
4097 | { | |
4098 | Elf_External_Rel *erel; | |
4099 | Elf_Internal_Rel irel; | |
4100 | ||
4101 | erel = (Elf_External_Rel *) rel_hdr->contents + i; | |
4102 | elf_swap_reloc_in (abfd, erel, &irel); | |
4103 | irel.r_info = ELF_R_INFO ((*rel_hash)->indx, | |
4104 | ELF_R_TYPE (irel.r_info)); | |
4105 | elf_swap_reloc_out (abfd, &irel, erel); | |
4106 | } | |
4107 | else | |
4108 | { | |
4109 | Elf_External_Rela *erela; | |
4110 | Elf_Internal_Rela irela; | |
4111 | ||
4112 | BFD_ASSERT (rel_hdr->sh_entsize | |
4113 | == sizeof (Elf_External_Rela)); | |
4114 | ||
4115 | erela = (Elf_External_Rela *) rel_hdr->contents + i; | |
4116 | elf_swap_reloca_in (abfd, erela, &irela); | |
4117 | irela.r_info = ELF_R_INFO ((*rel_hash)->indx, | |
4118 | ELF_R_TYPE (irela.r_info)); | |
4119 | elf_swap_reloca_out (abfd, &irela, erela); | |
4120 | } | |
4121 | } | |
4122 | ||
4123 | /* Set the reloc_count field to 0 to prevent write_relocs from | |
4124 | trying to swap the relocs out itself. */ | |
4125 | o->reloc_count = 0; | |
4126 | } | |
4127 | ||
4128 | /* If we are linking against a dynamic object, or generating a | |
4129 | shared library, finish up the dynamic linking information. */ | |
4130 | if (dynamic) | |
4131 | { | |
4132 | Elf_External_Dyn *dyncon, *dynconend; | |
4133 | ||
4134 | /* Fix up .dynamic entries. */ | |
4135 | o = bfd_get_section_by_name (dynobj, ".dynamic"); | |
4136 | BFD_ASSERT (o != NULL); | |
4137 | ||
4138 | dyncon = (Elf_External_Dyn *) o->contents; | |
4139 | dynconend = (Elf_External_Dyn *) (o->contents + o->_raw_size); | |
4140 | for (; dyncon < dynconend; dyncon++) | |
4141 | { | |
4142 | Elf_Internal_Dyn dyn; | |
4143 | const char *name; | |
4144 | unsigned int type; | |
4145 | ||
4146 | elf_swap_dyn_in (dynobj, dyncon, &dyn); | |
4147 | ||
4148 | switch (dyn.d_tag) | |
4149 | { | |
4150 | default: | |
4151 | break; | |
4152 | ||
4153 | /* SVR4 linkers seem to set DT_INIT and DT_FINI based on | |
4154 | magic _init and _fini symbols. This is pretty ugly, | |
4155 | but we are compatible. */ | |
4156 | case DT_INIT: | |
4157 | name = "_init"; | |
4158 | goto get_sym; | |
4159 | case DT_FINI: | |
4160 | name = "_fini"; | |
4161 | get_sym: | |
4162 | { | |
4163 | struct elf_link_hash_entry *h; | |
4164 | ||
4165 | h = elf_link_hash_lookup (elf_hash_table (info), name, | |
4166 | false, false, true); | |
4167 | if (h != NULL | |
4168 | && (h->root.type == bfd_link_hash_defined | |
4169 | || h->root.type == bfd_link_hash_defweak)) | |
4170 | { | |
4171 | dyn.d_un.d_val = h->root.u.def.value; | |
4172 | o = h->root.u.def.section; | |
4173 | if (o->output_section != NULL) | |
4174 | dyn.d_un.d_val += (o->output_section->vma | |
4175 | + o->output_offset); | |
4176 | else | |
4177 | { | |
4178 | /* The symbol is imported from another shared | |
4179 | library and does not apply to this one. */ | |
4180 | dyn.d_un.d_val = 0; | |
4181 | } | |
4182 | ||
4183 | elf_swap_dyn_out (dynobj, &dyn, dyncon); | |
4184 | } | |
4185 | } | |
4186 | break; | |
4187 | ||
4188 | case DT_HASH: | |
4189 | name = ".hash"; | |
4190 | goto get_vma; | |
4191 | case DT_STRTAB: | |
4192 | name = ".dynstr"; | |
4193 | goto get_vma; | |
4194 | case DT_SYMTAB: | |
4195 | name = ".dynsym"; | |
4196 | goto get_vma; | |
4197 | case DT_VERDEF: | |
4198 | name = ".gnu.version_d"; | |
4199 | goto get_vma; | |
4200 | case DT_VERNEED: | |
4201 | name = ".gnu.version_r"; | |
4202 | goto get_vma; | |
4203 | case DT_VERSYM: | |
4204 | name = ".gnu.version"; | |
4205 | get_vma: | |
4206 | o = bfd_get_section_by_name (abfd, name); | |
4207 | BFD_ASSERT (o != NULL); | |
4208 | dyn.d_un.d_ptr = o->vma; | |
4209 | elf_swap_dyn_out (dynobj, &dyn, dyncon); | |
4210 | break; | |
4211 | ||
4212 | case DT_REL: | |
4213 | case DT_RELA: | |
4214 | case DT_RELSZ: | |
4215 | case DT_RELASZ: | |
4216 | if (dyn.d_tag == DT_REL || dyn.d_tag == DT_RELSZ) | |
4217 | type = SHT_REL; | |
4218 | else | |
4219 | type = SHT_RELA; | |
4220 | dyn.d_un.d_val = 0; | |
4221 | for (i = 1; i < elf_elfheader (abfd)->e_shnum; i++) | |
4222 | { | |
4223 | Elf_Internal_Shdr *hdr; | |
4224 | ||
4225 | hdr = elf_elfsections (abfd)[i]; | |
4226 | if (hdr->sh_type == type | |
4227 | && (hdr->sh_flags & SHF_ALLOC) != 0) | |
4228 | { | |
4229 | if (dyn.d_tag == DT_RELSZ || dyn.d_tag == DT_RELASZ) | |
4230 | dyn.d_un.d_val += hdr->sh_size; | |
4231 | else | |
4232 | { | |
4233 | if (dyn.d_un.d_val == 0 | |
4234 | || hdr->sh_addr < dyn.d_un.d_val) | |
4235 | dyn.d_un.d_val = hdr->sh_addr; | |
4236 | } | |
4237 | } | |
4238 | } | |
4239 | elf_swap_dyn_out (dynobj, &dyn, dyncon); | |
4240 | break; | |
4241 | } | |
4242 | } | |
4243 | } | |
4244 | ||
4245 | /* If we have created any dynamic sections, then output them. */ | |
4246 | if (dynobj != NULL) | |
4247 | { | |
4248 | if (! (*bed->elf_backend_finish_dynamic_sections) (abfd, info)) | |
4249 | goto error_return; | |
4250 | ||
4251 | for (o = dynobj->sections; o != NULL; o = o->next) | |
4252 | { | |
4253 | if ((o->flags & SEC_HAS_CONTENTS) == 0 | |
4254 | || o->_raw_size == 0) | |
4255 | continue; | |
4256 | if ((o->flags & SEC_LINKER_CREATED) == 0) | |
4257 | { | |
4258 | /* At this point, we are only interested in sections | |
4259 | created by elf_link_create_dynamic_sections. */ | |
4260 | continue; | |
4261 | } | |
4262 | if ((elf_section_data (o->output_section)->this_hdr.sh_type | |
4263 | != SHT_STRTAB) | |
4264 | || strcmp (bfd_get_section_name (abfd, o), ".dynstr") != 0) | |
4265 | { | |
4266 | if (! bfd_set_section_contents (abfd, o->output_section, | |
4267 | o->contents, o->output_offset, | |
4268 | o->_raw_size)) | |
4269 | goto error_return; | |
4270 | } | |
4271 | else | |
4272 | { | |
4273 | file_ptr off; | |
4274 | ||
4275 | /* The contents of the .dynstr section are actually in a | |
4276 | stringtab. */ | |
4277 | off = elf_section_data (o->output_section)->this_hdr.sh_offset; | |
4278 | if (bfd_seek (abfd, off, SEEK_SET) != 0 | |
4279 | || ! _bfd_stringtab_emit (abfd, | |
4280 | elf_hash_table (info)->dynstr)) | |
4281 | goto error_return; | |
4282 | } | |
4283 | } | |
4284 | } | |
4285 | ||
4286 | /* If we have optimized stabs strings, output them. */ | |
4287 | if (elf_hash_table (info)->stab_info != NULL) | |
4288 | { | |
4289 | if (! _bfd_write_stab_strings (abfd, &elf_hash_table (info)->stab_info)) | |
4290 | goto error_return; | |
4291 | } | |
4292 | ||
4293 | if (finfo.symstrtab != NULL) | |
4294 | _bfd_stringtab_free (finfo.symstrtab); | |
4295 | if (finfo.contents != NULL) | |
4296 | free (finfo.contents); | |
4297 | if (finfo.external_relocs != NULL) | |
4298 | free (finfo.external_relocs); | |
4299 | if (finfo.internal_relocs != NULL) | |
4300 | free (finfo.internal_relocs); | |
4301 | if (finfo.external_syms != NULL) | |
4302 | free (finfo.external_syms); | |
4303 | if (finfo.internal_syms != NULL) | |
4304 | free (finfo.internal_syms); | |
4305 | if (finfo.indices != NULL) | |
4306 | free (finfo.indices); | |
4307 | if (finfo.sections != NULL) | |
4308 | free (finfo.sections); | |
4309 | if (finfo.symbuf != NULL) | |
4310 | free (finfo.symbuf); | |
4311 | for (o = abfd->sections; o != NULL; o = o->next) | |
4312 | { | |
4313 | if ((o->flags & SEC_RELOC) != 0 | |
4314 | && elf_section_data (o)->rel_hashes != NULL) | |
4315 | free (elf_section_data (o)->rel_hashes); | |
4316 | } | |
4317 | ||
4318 | elf_tdata (abfd)->linker = true; | |
4319 | ||
4320 | return true; | |
4321 | ||
4322 | error_return: | |
4323 | if (finfo.symstrtab != NULL) | |
4324 | _bfd_stringtab_free (finfo.symstrtab); | |
4325 | if (finfo.contents != NULL) | |
4326 | free (finfo.contents); | |
4327 | if (finfo.external_relocs != NULL) | |
4328 | free (finfo.external_relocs); | |
4329 | if (finfo.internal_relocs != NULL) | |
4330 | free (finfo.internal_relocs); | |
4331 | if (finfo.external_syms != NULL) | |
4332 | free (finfo.external_syms); | |
4333 | if (finfo.internal_syms != NULL) | |
4334 | free (finfo.internal_syms); | |
4335 | if (finfo.indices != NULL) | |
4336 | free (finfo.indices); | |
4337 | if (finfo.sections != NULL) | |
4338 | free (finfo.sections); | |
4339 | if (finfo.symbuf != NULL) | |
4340 | free (finfo.symbuf); | |
4341 | for (o = abfd->sections; o != NULL; o = o->next) | |
4342 | { | |
4343 | if ((o->flags & SEC_RELOC) != 0 | |
4344 | && elf_section_data (o)->rel_hashes != NULL) | |
4345 | free (elf_section_data (o)->rel_hashes); | |
4346 | } | |
4347 | ||
4348 | return false; | |
4349 | } | |
4350 | ||
4351 | /* Add a symbol to the output symbol table. */ | |
4352 | ||
4353 | static boolean | |
4354 | elf_link_output_sym (finfo, name, elfsym, input_sec) | |
4355 | struct elf_final_link_info *finfo; | |
4356 | const char *name; | |
4357 | Elf_Internal_Sym *elfsym; | |
4358 | asection *input_sec; | |
4359 | { | |
4360 | boolean (*output_symbol_hook) PARAMS ((bfd *, | |
4361 | struct bfd_link_info *info, | |
4362 | const char *, | |
4363 | Elf_Internal_Sym *, | |
4364 | asection *)); | |
4365 | ||
4366 | output_symbol_hook = get_elf_backend_data (finfo->output_bfd)-> | |
4367 | elf_backend_link_output_symbol_hook; | |
4368 | if (output_symbol_hook != NULL) | |
4369 | { | |
4370 | if (! ((*output_symbol_hook) | |
4371 | (finfo->output_bfd, finfo->info, name, elfsym, input_sec))) | |
4372 | return false; | |
4373 | } | |
4374 | ||
4375 | if (name == (const char *) NULL || *name == '\0') | |
4376 | elfsym->st_name = 0; | |
4377 | else if (input_sec->flags & SEC_EXCLUDE) | |
4378 | elfsym->st_name = 0; | |
4379 | else | |
4380 | { | |
4381 | elfsym->st_name = (unsigned long) _bfd_stringtab_add (finfo->symstrtab, | |
4382 | name, true, | |
4383 | false); | |
4384 | if (elfsym->st_name == (unsigned long) -1) | |
4385 | return false; | |
4386 | } | |
4387 | ||
4388 | if (finfo->symbuf_count >= finfo->symbuf_size) | |
4389 | { | |
4390 | if (! elf_link_flush_output_syms (finfo)) | |
4391 | return false; | |
4392 | } | |
4393 | ||
4394 | elf_swap_symbol_out (finfo->output_bfd, elfsym, | |
4395 | (PTR) (finfo->symbuf + finfo->symbuf_count)); | |
4396 | ++finfo->symbuf_count; | |
4397 | ||
4398 | ++ bfd_get_symcount (finfo->output_bfd); | |
4399 | ||
4400 | return true; | |
4401 | } | |
4402 | ||
4403 | /* Flush the output symbols to the file. */ | |
4404 | ||
4405 | static boolean | |
4406 | elf_link_flush_output_syms (finfo) | |
4407 | struct elf_final_link_info *finfo; | |
4408 | { | |
4409 | if (finfo->symbuf_count > 0) | |
4410 | { | |
4411 | Elf_Internal_Shdr *symtab; | |
4412 | ||
4413 | symtab = &elf_tdata (finfo->output_bfd)->symtab_hdr; | |
4414 | ||
4415 | if (bfd_seek (finfo->output_bfd, symtab->sh_offset + symtab->sh_size, | |
4416 | SEEK_SET) != 0 | |
4417 | || (bfd_write ((PTR) finfo->symbuf, finfo->symbuf_count, | |
4418 | sizeof (Elf_External_Sym), finfo->output_bfd) | |
4419 | != finfo->symbuf_count * sizeof (Elf_External_Sym))) | |
4420 | return false; | |
4421 | ||
4422 | symtab->sh_size += finfo->symbuf_count * sizeof (Elf_External_Sym); | |
4423 | ||
4424 | finfo->symbuf_count = 0; | |
4425 | } | |
4426 | ||
4427 | return true; | |
4428 | } | |
4429 | ||
4430 | /* Add an external symbol to the symbol table. This is called from | |
4431 | the hash table traversal routine. When generating a shared object, | |
4432 | we go through the symbol table twice. The first time we output | |
4433 | anything that might have been forced to local scope in a version | |
4434 | script. The second time we output the symbols that are still | |
4435 | global symbols. */ | |
4436 | ||
4437 | static boolean | |
4438 | elf_link_output_extsym (h, data) | |
4439 | struct elf_link_hash_entry *h; | |
4440 | PTR data; | |
4441 | { | |
4442 | struct elf_outext_info *eoinfo = (struct elf_outext_info *) data; | |
4443 | struct elf_final_link_info *finfo = eoinfo->finfo; | |
4444 | boolean strip; | |
4445 | Elf_Internal_Sym sym; | |
4446 | asection *input_sec; | |
4447 | ||
4448 | /* Decide whether to output this symbol in this pass. */ | |
4449 | if (eoinfo->localsyms) | |
4450 | { | |
4451 | if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) == 0) | |
4452 | return true; | |
4453 | } | |
4454 | else | |
4455 | { | |
4456 | if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) | |
4457 | return true; | |
4458 | } | |
4459 | ||
4460 | /* If we are not creating a shared library, and this symbol is | |
4461 | referenced by a shared library but is not defined anywhere, then | |
4462 | warn that it is undefined. If we do not do this, the runtime | |
4463 | linker will complain that the symbol is undefined when the | |
4464 | program is run. We don't have to worry about symbols that are | |
4465 | referenced by regular files, because we will already have issued | |
4466 | warnings for them. */ | |
4467 | if (! finfo->info->relocateable | |
4468 | && ! (finfo->info->shared | |
4469 | && !finfo->info->symbolic | |
4470 | && !finfo->info->no_undefined) | |
4471 | && h->root.type == bfd_link_hash_undefined | |
4472 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0 | |
4473 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0) | |
4474 | { | |
4475 | if (! ((*finfo->info->callbacks->undefined_symbol) | |
4476 | (finfo->info, h->root.root.string, h->root.u.undef.abfd, | |
4477 | (asection *) NULL, 0))) | |
4478 | { | |
4479 | eoinfo->failed = true; | |
4480 | return false; | |
4481 | } | |
4482 | } | |
4483 | ||
4484 | /* We don't want to output symbols that have never been mentioned by | |
4485 | a regular file, or that we have been told to strip. However, if | |
4486 | h->indx is set to -2, the symbol is used by a reloc and we must | |
4487 | output it. */ | |
4488 | if (h->indx == -2) | |
4489 | strip = false; | |
4490 | else if (((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
4491 | || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0) | |
4492 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
4493 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0) | |
4494 | strip = true; | |
4495 | else if (finfo->info->strip == strip_all | |
4496 | || (finfo->info->strip == strip_some | |
4497 | && bfd_hash_lookup (finfo->info->keep_hash, | |
4498 | h->root.root.string, | |
4499 | false, false) == NULL)) | |
4500 | strip = true; | |
4501 | else | |
4502 | strip = false; | |
4503 | ||
4504 | /* If we're stripping it, and it's not a dynamic symbol, there's | |
4505 | nothing else to do. */ | |
4506 | if (strip && h->dynindx == -1) | |
4507 | return true; | |
4508 | ||
4509 | sym.st_value = 0; | |
4510 | sym.st_size = h->size; | |
4511 | sym.st_other = h->other; | |
4512 | if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) | |
4513 | sym.st_info = ELF_ST_INFO (STB_LOCAL, h->type); | |
4514 | else if (h->root.type == bfd_link_hash_undefweak | |
4515 | || h->root.type == bfd_link_hash_defweak) | |
4516 | sym.st_info = ELF_ST_INFO (STB_WEAK, h->type); | |
4517 | else | |
4518 | sym.st_info = ELF_ST_INFO (STB_GLOBAL, h->type); | |
4519 | ||
4520 | switch (h->root.type) | |
4521 | { | |
4522 | default: | |
4523 | case bfd_link_hash_new: | |
4524 | abort (); | |
4525 | return false; | |
4526 | ||
4527 | case bfd_link_hash_undefined: | |
4528 | input_sec = bfd_und_section_ptr; | |
4529 | sym.st_shndx = SHN_UNDEF; | |
4530 | break; | |
4531 | ||
4532 | case bfd_link_hash_undefweak: | |
4533 | input_sec = bfd_und_section_ptr; | |
4534 | sym.st_shndx = SHN_UNDEF; | |
4535 | break; | |
4536 | ||
4537 | case bfd_link_hash_defined: | |
4538 | case bfd_link_hash_defweak: | |
4539 | { | |
4540 | input_sec = h->root.u.def.section; | |
4541 | if (input_sec->output_section != NULL) | |
4542 | { | |
4543 | sym.st_shndx = | |
4544 | _bfd_elf_section_from_bfd_section (finfo->output_bfd, | |
4545 | input_sec->output_section); | |
4546 | if (sym.st_shndx == (unsigned short) -1) | |
4547 | { | |
4548 | (*_bfd_error_handler) | |
4549 | (_("%s: could not find output section %s for input section %s"), | |
4550 | bfd_get_filename (finfo->output_bfd), | |
4551 | input_sec->output_section->name, | |
4552 | input_sec->name); | |
4553 | eoinfo->failed = true; | |
4554 | return false; | |
4555 | } | |
4556 | ||
4557 | /* ELF symbols in relocateable files are section relative, | |
4558 | but in nonrelocateable files they are virtual | |
4559 | addresses. */ | |
4560 | sym.st_value = h->root.u.def.value + input_sec->output_offset; | |
4561 | if (! finfo->info->relocateable) | |
4562 | sym.st_value += input_sec->output_section->vma; | |
4563 | } | |
4564 | else | |
4565 | { | |
4566 | BFD_ASSERT (input_sec->owner == NULL | |
4567 | || (input_sec->owner->flags & DYNAMIC) != 0); | |
4568 | sym.st_shndx = SHN_UNDEF; | |
4569 | input_sec = bfd_und_section_ptr; | |
4570 | } | |
4571 | } | |
4572 | break; | |
4573 | ||
4574 | case bfd_link_hash_common: | |
4575 | input_sec = h->root.u.c.p->section; | |
4576 | sym.st_shndx = SHN_COMMON; | |
4577 | sym.st_value = 1 << h->root.u.c.p->alignment_power; | |
4578 | break; | |
4579 | ||
4580 | case bfd_link_hash_indirect: | |
4581 | /* These symbols are created by symbol versioning. They point | |
4582 | to the decorated version of the name. For example, if the | |
4583 | symbol foo@@GNU_1.2 is the default, which should be used when | |
4584 | foo is used with no version, then we add an indirect symbol | |
4585 | foo which points to foo@@GNU_1.2. We ignore these symbols, | |
4586 | since the indirected symbol is already in the hash table. If | |
4587 | the indirect symbol is non-ELF, fall through and output it. */ | |
4588 | if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) == 0) | |
4589 | return true; | |
4590 | ||
4591 | /* Fall through. */ | |
4592 | case bfd_link_hash_warning: | |
4593 | /* We can't represent these symbols in ELF, although a warning | |
4594 | symbol may have come from a .gnu.warning.SYMBOL section. We | |
4595 | just put the target symbol in the hash table. If the target | |
4596 | symbol does not really exist, don't do anything. */ | |
4597 | if (h->root.u.i.link->type == bfd_link_hash_new) | |
4598 | return true; | |
4599 | return (elf_link_output_extsym | |
4600 | ((struct elf_link_hash_entry *) h->root.u.i.link, data)); | |
4601 | } | |
4602 | ||
4603 | /* Give the processor backend a chance to tweak the symbol value, | |
4604 | and also to finish up anything that needs to be done for this | |
4605 | symbol. */ | |
4606 | if ((h->dynindx != -1 | |
4607 | || (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) | |
4608 | && elf_hash_table (finfo->info)->dynamic_sections_created) | |
4609 | { | |
4610 | struct elf_backend_data *bed; | |
4611 | ||
4612 | bed = get_elf_backend_data (finfo->output_bfd); | |
4613 | if (! ((*bed->elf_backend_finish_dynamic_symbol) | |
4614 | (finfo->output_bfd, finfo->info, h, &sym))) | |
4615 | { | |
4616 | eoinfo->failed = true; | |
4617 | return false; | |
4618 | } | |
4619 | } | |
4620 | ||
4621 | /* If we are marking the symbol as undefined, and there are no | |
4622 | non-weak references to this symbol from a regular object, then | |
4623 | mark the symbol as weak undefined. We can't do this earlier, | |
4624 | because it might not be marked as undefined until the | |
4625 | finish_dynamic_symbol routine gets through with it. */ | |
4626 | if (sym.st_shndx == SHN_UNDEF | |
4627 | && sym.st_info == ELF_ST_INFO (STB_GLOBAL, h->type) | |
4628 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0 | |
4629 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR_NONWEAK) == 0) | |
4630 | sym.st_info = ELF_ST_INFO (STB_WEAK, h->type); | |
4631 | ||
4632 | /* If this symbol should be put in the .dynsym section, then put it | |
4633 | there now. We have already know the symbol index. We also fill | |
4634 | in the entry in the .hash section. */ | |
4635 | if (h->dynindx != -1 | |
4636 | && elf_hash_table (finfo->info)->dynamic_sections_created) | |
4637 | { | |
4638 | size_t bucketcount; | |
4639 | size_t bucket; | |
4640 | bfd_byte *bucketpos; | |
4641 | bfd_vma chain; | |
4642 | ||
4643 | sym.st_name = h->dynstr_index; | |
4644 | ||
4645 | elf_swap_symbol_out (finfo->output_bfd, &sym, | |
4646 | (PTR) (((Elf_External_Sym *) | |
4647 | finfo->dynsym_sec->contents) | |
4648 | + h->dynindx)); | |
4649 | ||
4650 | bucketcount = elf_hash_table (finfo->info)->bucketcount; | |
4651 | bucket = h->elf_hash_value % bucketcount; | |
4652 | bucketpos = ((bfd_byte *) finfo->hash_sec->contents | |
4653 | + (bucket + 2) * (ARCH_SIZE / 8)); | |
4654 | chain = get_word (finfo->output_bfd, bucketpos); | |
4655 | put_word (finfo->output_bfd, h->dynindx, bucketpos); | |
4656 | put_word (finfo->output_bfd, chain, | |
4657 | ((bfd_byte *) finfo->hash_sec->contents | |
4658 | + (bucketcount + 2 + h->dynindx) * (ARCH_SIZE / 8))); | |
4659 | ||
4660 | if (finfo->symver_sec != NULL && finfo->symver_sec->contents != NULL) | |
4661 | { | |
4662 | Elf_Internal_Versym iversym; | |
4663 | ||
4664 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
4665 | { | |
4666 | if (h->verinfo.verdef == NULL) | |
4667 | iversym.vs_vers = 0; | |
4668 | else | |
4669 | iversym.vs_vers = h->verinfo.verdef->vd_exp_refno + 1; | |
4670 | } | |
4671 | else | |
4672 | { | |
4673 | if (h->verinfo.vertree == NULL) | |
4674 | iversym.vs_vers = 1; | |
4675 | else | |
4676 | iversym.vs_vers = h->verinfo.vertree->vernum + 1; | |
4677 | } | |
4678 | ||
4679 | if ((h->elf_link_hash_flags & ELF_LINK_HIDDEN) != 0) | |
4680 | iversym.vs_vers |= VERSYM_HIDDEN; | |
4681 | ||
4682 | _bfd_elf_swap_versym_out (finfo->output_bfd, &iversym, | |
4683 | (((Elf_External_Versym *) | |
4684 | finfo->symver_sec->contents) | |
4685 | + h->dynindx)); | |
4686 | } | |
4687 | } | |
4688 | ||
4689 | /* If we're stripping it, then it was just a dynamic symbol, and | |
4690 | there's nothing else to do. */ | |
4691 | if (strip) | |
4692 | return true; | |
4693 | ||
4694 | h->indx = bfd_get_symcount (finfo->output_bfd); | |
4695 | ||
4696 | if (! elf_link_output_sym (finfo, h->root.root.string, &sym, input_sec)) | |
4697 | { | |
4698 | eoinfo->failed = true; | |
4699 | return false; | |
4700 | } | |
4701 | ||
4702 | return true; | |
4703 | } | |
4704 | ||
4705 | /* Link an input file into the linker output file. This function | |
4706 | handles all the sections and relocations of the input file at once. | |
4707 | This is so that we only have to read the local symbols once, and | |
4708 | don't have to keep them in memory. */ | |
4709 | ||
4710 | static boolean | |
4711 | elf_link_input_bfd (finfo, input_bfd) | |
4712 | struct elf_final_link_info *finfo; | |
4713 | bfd *input_bfd; | |
4714 | { | |
4715 | boolean (*relocate_section) PARAMS ((bfd *, struct bfd_link_info *, | |
4716 | bfd *, asection *, bfd_byte *, | |
4717 | Elf_Internal_Rela *, | |
4718 | Elf_Internal_Sym *, asection **)); | |
4719 | bfd *output_bfd; | |
4720 | Elf_Internal_Shdr *symtab_hdr; | |
4721 | size_t locsymcount; | |
4722 | size_t extsymoff; | |
4723 | Elf_External_Sym *external_syms; | |
4724 | Elf_External_Sym *esym; | |
4725 | Elf_External_Sym *esymend; | |
4726 | Elf_Internal_Sym *isym; | |
4727 | long *pindex; | |
4728 | asection **ppsection; | |
4729 | asection *o; | |
4730 | ||
4731 | output_bfd = finfo->output_bfd; | |
4732 | relocate_section = | |
4733 | get_elf_backend_data (output_bfd)->elf_backend_relocate_section; | |
4734 | ||
4735 | /* If this is a dynamic object, we don't want to do anything here: | |
4736 | we don't want the local symbols, and we don't want the section | |
4737 | contents. */ | |
4738 | if ((input_bfd->flags & DYNAMIC) != 0) | |
4739 | return true; | |
4740 | ||
4741 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
4742 | if (elf_bad_symtab (input_bfd)) | |
4743 | { | |
4744 | locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym); | |
4745 | extsymoff = 0; | |
4746 | } | |
4747 | else | |
4748 | { | |
4749 | locsymcount = symtab_hdr->sh_info; | |
4750 | extsymoff = symtab_hdr->sh_info; | |
4751 | } | |
4752 | ||
4753 | /* Read the local symbols. */ | |
4754 | if (symtab_hdr->contents != NULL) | |
4755 | external_syms = (Elf_External_Sym *) symtab_hdr->contents; | |
4756 | else if (locsymcount == 0) | |
4757 | external_syms = NULL; | |
4758 | else | |
4759 | { | |
4760 | external_syms = finfo->external_syms; | |
4761 | if (bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
4762 | || (bfd_read (external_syms, sizeof (Elf_External_Sym), | |
4763 | locsymcount, input_bfd) | |
4764 | != locsymcount * sizeof (Elf_External_Sym))) | |
4765 | return false; | |
4766 | } | |
4767 | ||
4768 | /* Swap in the local symbols and write out the ones which we know | |
4769 | are going into the output file. */ | |
4770 | esym = external_syms; | |
4771 | esymend = esym + locsymcount; | |
4772 | isym = finfo->internal_syms; | |
4773 | pindex = finfo->indices; | |
4774 | ppsection = finfo->sections; | |
4775 | for (; esym < esymend; esym++, isym++, pindex++, ppsection++) | |
4776 | { | |
4777 | asection *isec; | |
4778 | const char *name; | |
4779 | Elf_Internal_Sym osym; | |
4780 | ||
4781 | elf_swap_symbol_in (input_bfd, esym, isym); | |
4782 | *pindex = -1; | |
4783 | ||
4784 | if (elf_bad_symtab (input_bfd)) | |
4785 | { | |
4786 | if (ELF_ST_BIND (isym->st_info) != STB_LOCAL) | |
4787 | { | |
4788 | *ppsection = NULL; | |
4789 | continue; | |
4790 | } | |
4791 | } | |
4792 | ||
4793 | if (isym->st_shndx == SHN_UNDEF) | |
4794 | isec = bfd_und_section_ptr; | |
4795 | else if (isym->st_shndx > 0 && isym->st_shndx < SHN_LORESERVE) | |
4796 | isec = section_from_elf_index (input_bfd, isym->st_shndx); | |
4797 | else if (isym->st_shndx == SHN_ABS) | |
4798 | isec = bfd_abs_section_ptr; | |
4799 | else if (isym->st_shndx == SHN_COMMON) | |
4800 | isec = bfd_com_section_ptr; | |
4801 | else | |
4802 | { | |
4803 | /* Who knows? */ | |
4804 | isec = NULL; | |
4805 | } | |
4806 | ||
4807 | *ppsection = isec; | |
4808 | ||
4809 | /* Don't output the first, undefined, symbol. */ | |
4810 | if (esym == external_syms) | |
4811 | continue; | |
4812 | ||
4813 | /* If we are stripping all symbols, we don't want to output this | |
4814 | one. */ | |
4815 | if (finfo->info->strip == strip_all) | |
4816 | continue; | |
4817 | ||
4818 | /* We never output section symbols. Instead, we use the section | |
4819 | symbol of the corresponding section in the output file. */ | |
4820 | if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) | |
4821 | continue; | |
4822 | ||
4823 | /* If we are discarding all local symbols, we don't want to | |
4824 | output this one. If we are generating a relocateable output | |
4825 | file, then some of the local symbols may be required by | |
4826 | relocs; we output them below as we discover that they are | |
4827 | needed. */ | |
4828 | if (finfo->info->discard == discard_all) | |
4829 | continue; | |
4830 | ||
4831 | /* If this symbol is defined in a section which we are | |
4832 | discarding, we don't need to keep it, but note that | |
4833 | linker_mark is only reliable for sections that have contents. | |
4834 | For the benefit of the MIPS ELF linker, we check SEC_EXCLUDE | |
4835 | as well as linker_mark. */ | |
4836 | if (isym->st_shndx > 0 | |
4837 | && isym->st_shndx < SHN_LORESERVE | |
4838 | && isec != NULL | |
4839 | && ((! isec->linker_mark && (isec->flags & SEC_HAS_CONTENTS) != 0) | |
4840 | || (! finfo->info->relocateable | |
4841 | && (isec->flags & SEC_EXCLUDE) != 0))) | |
4842 | continue; | |
4843 | ||
4844 | /* Get the name of the symbol. */ | |
4845 | name = bfd_elf_string_from_elf_section (input_bfd, symtab_hdr->sh_link, | |
4846 | isym->st_name); | |
4847 | if (name == NULL) | |
4848 | return false; | |
4849 | ||
4850 | /* See if we are discarding symbols with this name. */ | |
4851 | if ((finfo->info->strip == strip_some | |
4852 | && (bfd_hash_lookup (finfo->info->keep_hash, name, false, false) | |
4853 | == NULL)) | |
4854 | || (finfo->info->discard == discard_l | |
4855 | && bfd_is_local_label_name (input_bfd, name))) | |
4856 | continue; | |
4857 | ||
4858 | /* If we get here, we are going to output this symbol. */ | |
4859 | ||
4860 | osym = *isym; | |
4861 | ||
4862 | /* Adjust the section index for the output file. */ | |
4863 | osym.st_shndx = _bfd_elf_section_from_bfd_section (output_bfd, | |
4864 | isec->output_section); | |
4865 | if (osym.st_shndx == (unsigned short) -1) | |
4866 | return false; | |
4867 | ||
4868 | *pindex = bfd_get_symcount (output_bfd); | |
4869 | ||
4870 | /* ELF symbols in relocateable files are section relative, but | |
4871 | in executable files they are virtual addresses. Note that | |
4872 | this code assumes that all ELF sections have an associated | |
4873 | BFD section with a reasonable value for output_offset; below | |
4874 | we assume that they also have a reasonable value for | |
4875 | output_section. Any special sections must be set up to meet | |
4876 | these requirements. */ | |
4877 | osym.st_value += isec->output_offset; | |
4878 | if (! finfo->info->relocateable) | |
4879 | osym.st_value += isec->output_section->vma; | |
4880 | ||
4881 | if (! elf_link_output_sym (finfo, name, &osym, isec)) | |
4882 | return false; | |
4883 | } | |
4884 | ||
4885 | /* Relocate the contents of each section. */ | |
4886 | for (o = input_bfd->sections; o != NULL; o = o->next) | |
4887 | { | |
4888 | bfd_byte *contents; | |
4889 | ||
4890 | if (! o->linker_mark) | |
4891 | { | |
4892 | /* This section was omitted from the link. */ | |
4893 | continue; | |
4894 | } | |
4895 | ||
4896 | if ((o->flags & SEC_HAS_CONTENTS) == 0 | |
4897 | || (o->_raw_size == 0 && (o->flags & SEC_RELOC) == 0)) | |
4898 | continue; | |
4899 | ||
4900 | if ((o->flags & SEC_LINKER_CREATED) != 0) | |
4901 | { | |
4902 | /* Section was created by elf_link_create_dynamic_sections | |
4903 | or somesuch. */ | |
4904 | continue; | |
4905 | } | |
4906 | ||
4907 | /* Get the contents of the section. They have been cached by a | |
4908 | relaxation routine. Note that o is a section in an input | |
4909 | file, so the contents field will not have been set by any of | |
4910 | the routines which work on output files. */ | |
4911 | if (elf_section_data (o)->this_hdr.contents != NULL) | |
4912 | contents = elf_section_data (o)->this_hdr.contents; | |
4913 | else | |
4914 | { | |
4915 | contents = finfo->contents; | |
4916 | if (! bfd_get_section_contents (input_bfd, o, contents, | |
4917 | (file_ptr) 0, o->_raw_size)) | |
4918 | return false; | |
4919 | } | |
4920 | ||
4921 | if ((o->flags & SEC_RELOC) != 0) | |
4922 | { | |
4923 | Elf_Internal_Rela *internal_relocs; | |
4924 | ||
4925 | /* Get the swapped relocs. */ | |
4926 | internal_relocs = (NAME(_bfd_elf,link_read_relocs) | |
4927 | (input_bfd, o, finfo->external_relocs, | |
4928 | finfo->internal_relocs, false)); | |
4929 | if (internal_relocs == NULL | |
4930 | && o->reloc_count > 0) | |
4931 | return false; | |
4932 | ||
4933 | /* Relocate the section by invoking a back end routine. | |
4934 | ||
4935 | The back end routine is responsible for adjusting the | |
4936 | section contents as necessary, and (if using Rela relocs | |
4937 | and generating a relocateable output file) adjusting the | |
4938 | reloc addend as necessary. | |
4939 | ||
4940 | The back end routine does not have to worry about setting | |
4941 | the reloc address or the reloc symbol index. | |
4942 | ||
4943 | The back end routine is given a pointer to the swapped in | |
4944 | internal symbols, and can access the hash table entries | |
4945 | for the external symbols via elf_sym_hashes (input_bfd). | |
4946 | ||
4947 | When generating relocateable output, the back end routine | |
4948 | must handle STB_LOCAL/STT_SECTION symbols specially. The | |
4949 | output symbol is going to be a section symbol | |
4950 | corresponding to the output section, which will require | |
4951 | the addend to be adjusted. */ | |
4952 | ||
4953 | if (! (*relocate_section) (output_bfd, finfo->info, | |
4954 | input_bfd, o, contents, | |
4955 | internal_relocs, | |
4956 | finfo->internal_syms, | |
4957 | finfo->sections)) | |
4958 | return false; | |
4959 | ||
4960 | if (finfo->info->relocateable) | |
4961 | { | |
4962 | Elf_Internal_Rela *irela; | |
4963 | Elf_Internal_Rela *irelaend; | |
4964 | struct elf_link_hash_entry **rel_hash; | |
4965 | Elf_Internal_Shdr *input_rel_hdr; | |
4966 | Elf_Internal_Shdr *output_rel_hdr; | |
4967 | ||
4968 | /* Adjust the reloc addresses and symbol indices. */ | |
4969 | ||
4970 | irela = internal_relocs; | |
4971 | irelaend = irela + o->reloc_count; | |
4972 | rel_hash = (elf_section_data (o->output_section)->rel_hashes | |
4973 | + o->output_section->reloc_count); | |
4974 | for (; irela < irelaend; irela++, rel_hash++) | |
4975 | { | |
4976 | unsigned long r_symndx; | |
4977 | Elf_Internal_Sym *isym; | |
4978 | asection *sec; | |
4979 | ||
4980 | irela->r_offset += o->output_offset; | |
4981 | ||
4982 | r_symndx = ELF_R_SYM (irela->r_info); | |
4983 | ||
4984 | if (r_symndx == 0) | |
4985 | continue; | |
4986 | ||
4987 | if (r_symndx >= locsymcount | |
4988 | || (elf_bad_symtab (input_bfd) | |
4989 | && finfo->sections[r_symndx] == NULL)) | |
4990 | { | |
4991 | struct elf_link_hash_entry *rh; | |
4992 | long indx; | |
4993 | ||
4994 | /* This is a reloc against a global symbol. We | |
4995 | have not yet output all the local symbols, so | |
4996 | we do not know the symbol index of any global | |
4997 | symbol. We set the rel_hash entry for this | |
4998 | reloc to point to the global hash table entry | |
4999 | for this symbol. The symbol index is then | |
5000 | set at the end of elf_bfd_final_link. */ | |
5001 | indx = r_symndx - extsymoff; | |
5002 | rh = elf_sym_hashes (input_bfd)[indx]; | |
5003 | while (rh->root.type == bfd_link_hash_indirect | |
5004 | || rh->root.type == bfd_link_hash_warning) | |
5005 | rh = (struct elf_link_hash_entry *) rh->root.u.i.link; | |
5006 | ||
5007 | /* Setting the index to -2 tells | |
5008 | elf_link_output_extsym that this symbol is | |
5009 | used by a reloc. */ | |
5010 | BFD_ASSERT (rh->indx < 0); | |
5011 | rh->indx = -2; | |
5012 | ||
5013 | *rel_hash = rh; | |
5014 | ||
5015 | continue; | |
5016 | } | |
5017 | ||
5018 | /* This is a reloc against a local symbol. */ | |
5019 | ||
5020 | *rel_hash = NULL; | |
5021 | isym = finfo->internal_syms + r_symndx; | |
5022 | sec = finfo->sections[r_symndx]; | |
5023 | if (ELF_ST_TYPE (isym->st_info) == STT_SECTION) | |
5024 | { | |
5025 | /* I suppose the backend ought to fill in the | |
5026 | section of any STT_SECTION symbol against a | |
5027 | processor specific section. If we have | |
5028 | discarded a section, the output_section will | |
5029 | be the absolute section. */ | |
5030 | if (sec != NULL | |
5031 | && (bfd_is_abs_section (sec) | |
5032 | || (sec->output_section != NULL | |
5033 | && bfd_is_abs_section (sec->output_section)))) | |
5034 | r_symndx = 0; | |
5035 | else if (sec == NULL || sec->owner == NULL) | |
5036 | { | |
5037 | bfd_set_error (bfd_error_bad_value); | |
5038 | return false; | |
5039 | } | |
5040 | else | |
5041 | { | |
5042 | r_symndx = sec->output_section->target_index; | |
5043 | BFD_ASSERT (r_symndx != 0); | |
5044 | } | |
5045 | } | |
5046 | else | |
5047 | { | |
5048 | if (finfo->indices[r_symndx] == -1) | |
5049 | { | |
5050 | unsigned long link; | |
5051 | const char *name; | |
5052 | asection *osec; | |
5053 | ||
5054 | if (finfo->info->strip == strip_all) | |
5055 | { | |
5056 | /* You can't do ld -r -s. */ | |
5057 | bfd_set_error (bfd_error_invalid_operation); | |
5058 | return false; | |
5059 | } | |
5060 | ||
5061 | /* This symbol was skipped earlier, but | |
5062 | since it is needed by a reloc, we | |
5063 | must output it now. */ | |
5064 | link = symtab_hdr->sh_link; | |
5065 | name = bfd_elf_string_from_elf_section (input_bfd, | |
5066 | link, | |
5067 | isym->st_name); | |
5068 | if (name == NULL) | |
5069 | return false; | |
5070 | ||
5071 | osec = sec->output_section; | |
5072 | isym->st_shndx = | |
5073 | _bfd_elf_section_from_bfd_section (output_bfd, | |
5074 | osec); | |
5075 | if (isym->st_shndx == (unsigned short) -1) | |
5076 | return false; | |
5077 | ||
5078 | isym->st_value += sec->output_offset; | |
5079 | if (! finfo->info->relocateable) | |
5080 | isym->st_value += osec->vma; | |
5081 | ||
5082 | finfo->indices[r_symndx] = bfd_get_symcount (output_bfd); | |
5083 | ||
5084 | if (! elf_link_output_sym (finfo, name, isym, sec)) | |
5085 | return false; | |
5086 | } | |
5087 | ||
5088 | r_symndx = finfo->indices[r_symndx]; | |
5089 | } | |
5090 | ||
5091 | irela->r_info = ELF_R_INFO (r_symndx, | |
5092 | ELF_R_TYPE (irela->r_info)); | |
5093 | } | |
5094 | ||
5095 | /* Swap out the relocs. */ | |
5096 | input_rel_hdr = &elf_section_data (o)->rel_hdr; | |
5097 | output_rel_hdr = &elf_section_data (o->output_section)->rel_hdr; | |
5098 | BFD_ASSERT (output_rel_hdr->sh_entsize | |
5099 | == input_rel_hdr->sh_entsize); | |
5100 | irela = internal_relocs; | |
5101 | irelaend = irela + o->reloc_count; | |
5102 | if (input_rel_hdr->sh_entsize == sizeof (Elf_External_Rel)) | |
5103 | { | |
5104 | Elf_External_Rel *erel; | |
5105 | ||
5106 | erel = ((Elf_External_Rel *) output_rel_hdr->contents | |
5107 | + o->output_section->reloc_count); | |
5108 | for (; irela < irelaend; irela++, erel++) | |
5109 | { | |
5110 | Elf_Internal_Rel irel; | |
5111 | ||
5112 | irel.r_offset = irela->r_offset; | |
5113 | irel.r_info = irela->r_info; | |
5114 | BFD_ASSERT (irela->r_addend == 0); | |
5115 | elf_swap_reloc_out (output_bfd, &irel, erel); | |
5116 | } | |
5117 | } | |
5118 | else | |
5119 | { | |
5120 | Elf_External_Rela *erela; | |
5121 | ||
5122 | BFD_ASSERT (input_rel_hdr->sh_entsize | |
5123 | == sizeof (Elf_External_Rela)); | |
5124 | erela = ((Elf_External_Rela *) output_rel_hdr->contents | |
5125 | + o->output_section->reloc_count); | |
5126 | for (; irela < irelaend; irela++, erela++) | |
5127 | elf_swap_reloca_out (output_bfd, irela, erela); | |
5128 | } | |
5129 | ||
5130 | o->output_section->reloc_count += o->reloc_count; | |
5131 | } | |
5132 | } | |
5133 | ||
5134 | /* Write out the modified section contents. */ | |
5135 | if (elf_section_data (o)->stab_info == NULL) | |
5136 | { | |
5137 | if (! (o->flags & SEC_EXCLUDE) && | |
5138 | ! bfd_set_section_contents (output_bfd, o->output_section, | |
5139 | contents, o->output_offset, | |
5140 | (o->_cooked_size != 0 | |
5141 | ? o->_cooked_size | |
5142 | : o->_raw_size))) | |
5143 | return false; | |
5144 | } | |
5145 | else | |
5146 | { | |
5147 | if (! (_bfd_write_section_stabs | |
5148 | (output_bfd, &elf_hash_table (finfo->info)->stab_info, | |
5149 | o, &elf_section_data (o)->stab_info, contents))) | |
5150 | return false; | |
5151 | } | |
5152 | } | |
5153 | ||
5154 | return true; | |
5155 | } | |
5156 | ||
5157 | /* Generate a reloc when linking an ELF file. This is a reloc | |
5158 | requested by the linker, and does come from any input file. This | |
5159 | is used to build constructor and destructor tables when linking | |
5160 | with -Ur. */ | |
5161 | ||
5162 | static boolean | |
5163 | elf_reloc_link_order (output_bfd, info, output_section, link_order) | |
5164 | bfd *output_bfd; | |
5165 | struct bfd_link_info *info; | |
5166 | asection *output_section; | |
5167 | struct bfd_link_order *link_order; | |
5168 | { | |
5169 | reloc_howto_type *howto; | |
5170 | long indx; | |
5171 | bfd_vma offset; | |
5172 | bfd_vma addend; | |
5173 | struct elf_link_hash_entry **rel_hash_ptr; | |
5174 | Elf_Internal_Shdr *rel_hdr; | |
5175 | ||
5176 | howto = bfd_reloc_type_lookup (output_bfd, link_order->u.reloc.p->reloc); | |
5177 | if (howto == NULL) | |
5178 | { | |
5179 | bfd_set_error (bfd_error_bad_value); | |
5180 | return false; | |
5181 | } | |
5182 | ||
5183 | addend = link_order->u.reloc.p->addend; | |
5184 | ||
5185 | /* Figure out the symbol index. */ | |
5186 | rel_hash_ptr = (elf_section_data (output_section)->rel_hashes | |
5187 | + output_section->reloc_count); | |
5188 | if (link_order->type == bfd_section_reloc_link_order) | |
5189 | { | |
5190 | indx = link_order->u.reloc.p->u.section->target_index; | |
5191 | BFD_ASSERT (indx != 0); | |
5192 | *rel_hash_ptr = NULL; | |
5193 | } | |
5194 | else | |
5195 | { | |
5196 | struct elf_link_hash_entry *h; | |
5197 | ||
5198 | /* Treat a reloc against a defined symbol as though it were | |
5199 | actually against the section. */ | |
5200 | h = ((struct elf_link_hash_entry *) | |
5201 | bfd_wrapped_link_hash_lookup (output_bfd, info, | |
5202 | link_order->u.reloc.p->u.name, | |
5203 | false, false, true)); | |
5204 | if (h != NULL | |
5205 | && (h->root.type == bfd_link_hash_defined | |
5206 | || h->root.type == bfd_link_hash_defweak)) | |
5207 | { | |
5208 | asection *section; | |
5209 | ||
5210 | section = h->root.u.def.section; | |
5211 | indx = section->output_section->target_index; | |
5212 | *rel_hash_ptr = NULL; | |
5213 | /* It seems that we ought to add the symbol value to the | |
5214 | addend here, but in practice it has already been added | |
5215 | because it was passed to constructor_callback. */ | |
5216 | addend += section->output_section->vma + section->output_offset; | |
5217 | } | |
5218 | else if (h != NULL) | |
5219 | { | |
5220 | /* Setting the index to -2 tells elf_link_output_extsym that | |
5221 | this symbol is used by a reloc. */ | |
5222 | h->indx = -2; | |
5223 | *rel_hash_ptr = h; | |
5224 | indx = 0; | |
5225 | } | |
5226 | else | |
5227 | { | |
5228 | if (! ((*info->callbacks->unattached_reloc) | |
5229 | (info, link_order->u.reloc.p->u.name, (bfd *) NULL, | |
5230 | (asection *) NULL, (bfd_vma) 0))) | |
5231 | return false; | |
5232 | indx = 0; | |
5233 | } | |
5234 | } | |
5235 | ||
5236 | /* If this is an inplace reloc, we must write the addend into the | |
5237 | object file. */ | |
5238 | if (howto->partial_inplace && addend != 0) | |
5239 | { | |
5240 | bfd_size_type size; | |
5241 | bfd_reloc_status_type rstat; | |
5242 | bfd_byte *buf; | |
5243 | boolean ok; | |
5244 | ||
5245 | size = bfd_get_reloc_size (howto); | |
5246 | buf = (bfd_byte *) bfd_zmalloc (size); | |
5247 | if (buf == (bfd_byte *) NULL) | |
5248 | return false; | |
5249 | rstat = _bfd_relocate_contents (howto, output_bfd, addend, buf); | |
5250 | switch (rstat) | |
5251 | { | |
5252 | case bfd_reloc_ok: | |
5253 | break; | |
5254 | default: | |
5255 | case bfd_reloc_outofrange: | |
5256 | abort (); | |
5257 | case bfd_reloc_overflow: | |
5258 | if (! ((*info->callbacks->reloc_overflow) | |
5259 | (info, | |
5260 | (link_order->type == bfd_section_reloc_link_order | |
5261 | ? bfd_section_name (output_bfd, | |
5262 | link_order->u.reloc.p->u.section) | |
5263 | : link_order->u.reloc.p->u.name), | |
5264 | howto->name, addend, (bfd *) NULL, (asection *) NULL, | |
5265 | (bfd_vma) 0))) | |
5266 | { | |
5267 | free (buf); | |
5268 | return false; | |
5269 | } | |
5270 | break; | |
5271 | } | |
5272 | ok = bfd_set_section_contents (output_bfd, output_section, (PTR) buf, | |
5273 | (file_ptr) link_order->offset, size); | |
5274 | free (buf); | |
5275 | if (! ok) | |
5276 | return false; | |
5277 | } | |
5278 | ||
5279 | /* The address of a reloc is relative to the section in a | |
5280 | relocateable file, and is a virtual address in an executable | |
5281 | file. */ | |
5282 | offset = link_order->offset; | |
5283 | if (! info->relocateable) | |
5284 | offset += output_section->vma; | |
5285 | ||
5286 | rel_hdr = &elf_section_data (output_section)->rel_hdr; | |
5287 | ||
5288 | if (rel_hdr->sh_type == SHT_REL) | |
5289 | { | |
5290 | Elf_Internal_Rel irel; | |
5291 | Elf_External_Rel *erel; | |
5292 | ||
5293 | irel.r_offset = offset; | |
5294 | irel.r_info = ELF_R_INFO (indx, howto->type); | |
5295 | erel = ((Elf_External_Rel *) rel_hdr->contents | |
5296 | + output_section->reloc_count); | |
5297 | elf_swap_reloc_out (output_bfd, &irel, erel); | |
5298 | } | |
5299 | else | |
5300 | { | |
5301 | Elf_Internal_Rela irela; | |
5302 | Elf_External_Rela *erela; | |
5303 | ||
5304 | irela.r_offset = offset; | |
5305 | irela.r_info = ELF_R_INFO (indx, howto->type); | |
5306 | irela.r_addend = addend; | |
5307 | erela = ((Elf_External_Rela *) rel_hdr->contents | |
5308 | + output_section->reloc_count); | |
5309 | elf_swap_reloca_out (output_bfd, &irela, erela); | |
5310 | } | |
5311 | ||
5312 | ++output_section->reloc_count; | |
5313 | ||
5314 | return true; | |
5315 | } | |
5316 | ||
5317 | \f | |
5318 | /* Allocate a pointer to live in a linker created section. */ | |
5319 | ||
5320 | boolean | |
5321 | elf_create_pointer_linker_section (abfd, info, lsect, h, rel) | |
5322 | bfd *abfd; | |
5323 | struct bfd_link_info *info; | |
5324 | elf_linker_section_t *lsect; | |
5325 | struct elf_link_hash_entry *h; | |
5326 | const Elf_Internal_Rela *rel; | |
5327 | { | |
5328 | elf_linker_section_pointers_t **ptr_linker_section_ptr = NULL; | |
5329 | elf_linker_section_pointers_t *linker_section_ptr; | |
5330 | unsigned long r_symndx = ELF_R_SYM (rel->r_info);; | |
5331 | ||
5332 | BFD_ASSERT (lsect != NULL); | |
5333 | ||
5334 | /* Is this a global symbol? */ | |
5335 | if (h != NULL) | |
5336 | { | |
5337 | /* Has this symbol already been allocated, if so, our work is done */ | |
5338 | if (_bfd_elf_find_pointer_linker_section (h->linker_section_pointer, | |
5339 | rel->r_addend, | |
5340 | lsect->which)) | |
5341 | return true; | |
5342 | ||
5343 | ptr_linker_section_ptr = &h->linker_section_pointer; | |
5344 | /* Make sure this symbol is output as a dynamic symbol. */ | |
5345 | if (h->dynindx == -1) | |
5346 | { | |
5347 | if (! elf_link_record_dynamic_symbol (info, h)) | |
5348 | return false; | |
5349 | } | |
5350 | ||
5351 | if (lsect->rel_section) | |
5352 | lsect->rel_section->_raw_size += sizeof (Elf_External_Rela); | |
5353 | } | |
5354 | ||
5355 | else /* Allocation of a pointer to a local symbol */ | |
5356 | { | |
5357 | elf_linker_section_pointers_t **ptr = elf_local_ptr_offsets (abfd); | |
5358 | ||
5359 | /* Allocate a table to hold the local symbols if first time */ | |
5360 | if (!ptr) | |
5361 | { | |
5362 | unsigned int num_symbols = elf_tdata (abfd)->symtab_hdr.sh_info; | |
5363 | register unsigned int i; | |
5364 | ||
5365 | ptr = (elf_linker_section_pointers_t **) | |
5366 | bfd_alloc (abfd, num_symbols * sizeof (elf_linker_section_pointers_t *)); | |
5367 | ||
5368 | if (!ptr) | |
5369 | return false; | |
5370 | ||
5371 | elf_local_ptr_offsets (abfd) = ptr; | |
5372 | for (i = 0; i < num_symbols; i++) | |
5373 | ptr[i] = (elf_linker_section_pointers_t *)0; | |
5374 | } | |
5375 | ||
5376 | /* Has this symbol already been allocated, if so, our work is done */ | |
5377 | if (_bfd_elf_find_pointer_linker_section (ptr[r_symndx], | |
5378 | rel->r_addend, | |
5379 | lsect->which)) | |
5380 | return true; | |
5381 | ||
5382 | ptr_linker_section_ptr = &ptr[r_symndx]; | |
5383 | ||
5384 | if (info->shared) | |
5385 | { | |
5386 | /* If we are generating a shared object, we need to | |
5387 | output a R_<xxx>_RELATIVE reloc so that the | |
5388 | dynamic linker can adjust this GOT entry. */ | |
5389 | BFD_ASSERT (lsect->rel_section != NULL); | |
5390 | lsect->rel_section->_raw_size += sizeof (Elf_External_Rela); | |
5391 | } | |
5392 | } | |
5393 | ||
5394 | /* Allocate space for a pointer in the linker section, and allocate a new pointer record | |
5395 | from internal memory. */ | |
5396 | BFD_ASSERT (ptr_linker_section_ptr != NULL); | |
5397 | linker_section_ptr = (elf_linker_section_pointers_t *) | |
5398 | bfd_alloc (abfd, sizeof (elf_linker_section_pointers_t)); | |
5399 | ||
5400 | if (!linker_section_ptr) | |
5401 | return false; | |
5402 | ||
5403 | linker_section_ptr->next = *ptr_linker_section_ptr; | |
5404 | linker_section_ptr->addend = rel->r_addend; | |
5405 | linker_section_ptr->which = lsect->which; | |
5406 | linker_section_ptr->written_address_p = false; | |
5407 | *ptr_linker_section_ptr = linker_section_ptr; | |
5408 | ||
5409 | #if 0 | |
5410 | if (lsect->hole_size && lsect->hole_offset < lsect->max_hole_offset) | |
5411 | { | |
5412 | linker_section_ptr->offset = lsect->section->_raw_size - lsect->hole_size + (ARCH_SIZE / 8); | |
5413 | lsect->hole_offset += ARCH_SIZE / 8; | |
5414 | lsect->sym_offset += ARCH_SIZE / 8; | |
5415 | if (lsect->sym_hash) /* Bump up symbol value if needed */ | |
5416 | { | |
5417 | lsect->sym_hash->root.u.def.value += ARCH_SIZE / 8; | |
5418 | #ifdef DEBUG | |
5419 | fprintf (stderr, "Bump up %s by %ld, current value = %ld\n", | |
5420 | lsect->sym_hash->root.root.string, | |
5421 | (long)ARCH_SIZE / 8, | |
5422 | (long)lsect->sym_hash->root.u.def.value); | |
5423 | #endif | |
5424 | } | |
5425 | } | |
5426 | else | |
5427 | #endif | |
5428 | linker_section_ptr->offset = lsect->section->_raw_size; | |
5429 | ||
5430 | lsect->section->_raw_size += ARCH_SIZE / 8; | |
5431 | ||
5432 | #ifdef DEBUG | |
5433 | fprintf (stderr, "Create pointer in linker section %s, offset = %ld, section size = %ld\n", | |
5434 | lsect->name, (long)linker_section_ptr->offset, (long)lsect->section->_raw_size); | |
5435 | #endif | |
5436 | ||
5437 | return true; | |
5438 | } | |
5439 | ||
5440 | \f | |
5441 | #if ARCH_SIZE==64 | |
5442 | #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_64 (BFD, VAL, ADDR) | |
5443 | #endif | |
5444 | #if ARCH_SIZE==32 | |
5445 | #define bfd_put_ptr(BFD,VAL,ADDR) bfd_put_32 (BFD, VAL, ADDR) | |
5446 | #endif | |
5447 | ||
5448 | /* Fill in the address for a pointer generated in alinker section. */ | |
5449 | ||
5450 | bfd_vma | |
5451 | elf_finish_pointer_linker_section (output_bfd, input_bfd, info, lsect, h, relocation, rel, relative_reloc) | |
5452 | bfd *output_bfd; | |
5453 | bfd *input_bfd; | |
5454 | struct bfd_link_info *info; | |
5455 | elf_linker_section_t *lsect; | |
5456 | struct elf_link_hash_entry *h; | |
5457 | bfd_vma relocation; | |
5458 | const Elf_Internal_Rela *rel; | |
5459 | int relative_reloc; | |
5460 | { | |
5461 | elf_linker_section_pointers_t *linker_section_ptr; | |
5462 | ||
5463 | BFD_ASSERT (lsect != NULL); | |
5464 | ||
5465 | if (h != NULL) /* global symbol */ | |
5466 | { | |
5467 | linker_section_ptr = _bfd_elf_find_pointer_linker_section (h->linker_section_pointer, | |
5468 | rel->r_addend, | |
5469 | lsect->which); | |
5470 | ||
5471 | BFD_ASSERT (linker_section_ptr != NULL); | |
5472 | ||
5473 | if (! elf_hash_table (info)->dynamic_sections_created | |
5474 | || (info->shared | |
5475 | && info->symbolic | |
5476 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR))) | |
5477 | { | |
5478 | /* This is actually a static link, or it is a | |
5479 | -Bsymbolic link and the symbol is defined | |
5480 | locally. We must initialize this entry in the | |
5481 | global section. | |
5482 | ||
5483 | When doing a dynamic link, we create a .rela.<xxx> | |
5484 | relocation entry to initialize the value. This | |
5485 | is done in the finish_dynamic_symbol routine. */ | |
5486 | if (!linker_section_ptr->written_address_p) | |
5487 | { | |
5488 | linker_section_ptr->written_address_p = true; | |
5489 | bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend, | |
5490 | lsect->section->contents + linker_section_ptr->offset); | |
5491 | } | |
5492 | } | |
5493 | } | |
5494 | else /* local symbol */ | |
5495 | { | |
5496 | unsigned long r_symndx = ELF_R_SYM (rel->r_info); | |
5497 | BFD_ASSERT (elf_local_ptr_offsets (input_bfd) != NULL); | |
5498 | BFD_ASSERT (elf_local_ptr_offsets (input_bfd)[r_symndx] != NULL); | |
5499 | linker_section_ptr = _bfd_elf_find_pointer_linker_section (elf_local_ptr_offsets (input_bfd)[r_symndx], | |
5500 | rel->r_addend, | |
5501 | lsect->which); | |
5502 | ||
5503 | BFD_ASSERT (linker_section_ptr != NULL); | |
5504 | ||
5505 | /* Write out pointer if it hasn't been rewritten out before */ | |
5506 | if (!linker_section_ptr->written_address_p) | |
5507 | { | |
5508 | linker_section_ptr->written_address_p = true; | |
5509 | bfd_put_ptr (output_bfd, relocation + linker_section_ptr->addend, | |
5510 | lsect->section->contents + linker_section_ptr->offset); | |
5511 | ||
5512 | if (info->shared) | |
5513 | { | |
5514 | asection *srel = lsect->rel_section; | |
5515 | Elf_Internal_Rela outrel; | |
5516 | ||
5517 | /* We need to generate a relative reloc for the dynamic linker. */ | |
5518 | if (!srel) | |
5519 | lsect->rel_section = srel = bfd_get_section_by_name (elf_hash_table (info)->dynobj, | |
5520 | lsect->rel_name); | |
5521 | ||
5522 | BFD_ASSERT (srel != NULL); | |
5523 | ||
5524 | outrel.r_offset = (lsect->section->output_section->vma | |
5525 | + lsect->section->output_offset | |
5526 | + linker_section_ptr->offset); | |
5527 | outrel.r_info = ELF_R_INFO (0, relative_reloc); | |
5528 | outrel.r_addend = 0; | |
5529 | elf_swap_reloca_out (output_bfd, &outrel, | |
5530 | (((Elf_External_Rela *) | |
5531 | lsect->section->contents) | |
5532 | + lsect->section->reloc_count)); | |
5533 | ++lsect->section->reloc_count; | |
5534 | } | |
5535 | } | |
5536 | } | |
5537 | ||
5538 | relocation = (lsect->section->output_offset | |
5539 | + linker_section_ptr->offset | |
5540 | - lsect->hole_offset | |
5541 | - lsect->sym_offset); | |
5542 | ||
5543 | #ifdef DEBUG | |
5544 | fprintf (stderr, "Finish pointer in linker section %s, offset = %ld (0x%lx)\n", | |
5545 | lsect->name, (long)relocation, (long)relocation); | |
5546 | #endif | |
5547 | ||
5548 | /* Subtract out the addend, because it will get added back in by the normal | |
5549 | processing. */ | |
5550 | return relocation - linker_section_ptr->addend; | |
5551 | } | |
5552 | \f | |
5553 | /* Garbage collect unused sections. */ | |
5554 | ||
5555 | static boolean elf_gc_mark | |
5556 | PARAMS ((struct bfd_link_info *info, asection *sec, | |
5557 | asection * (*gc_mark_hook) | |
5558 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
5559 | struct elf_link_hash_entry *, Elf_Internal_Sym *)))); | |
5560 | ||
5561 | static boolean elf_gc_sweep | |
5562 | PARAMS ((struct bfd_link_info *info, | |
5563 | boolean (*gc_sweep_hook) | |
5564 | PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o, | |
5565 | const Elf_Internal_Rela *relocs)))); | |
5566 | ||
5567 | static boolean elf_gc_sweep_symbol | |
5568 | PARAMS ((struct elf_link_hash_entry *h, PTR idxptr)); | |
5569 | ||
5570 | static boolean elf_gc_allocate_got_offsets | |
5571 | PARAMS ((struct elf_link_hash_entry *h, PTR offarg)); | |
5572 | ||
5573 | static boolean elf_gc_propagate_vtable_entries_used | |
5574 | PARAMS ((struct elf_link_hash_entry *h, PTR dummy)); | |
5575 | ||
5576 | static boolean elf_gc_smash_unused_vtentry_relocs | |
5577 | PARAMS ((struct elf_link_hash_entry *h, PTR dummy)); | |
5578 | ||
5579 | /* The mark phase of garbage collection. For a given section, mark | |
5580 | it, and all the sections which define symbols to which it refers. */ | |
5581 | ||
5582 | static boolean | |
5583 | elf_gc_mark (info, sec, gc_mark_hook) | |
5584 | struct bfd_link_info *info; | |
5585 | asection *sec; | |
5586 | asection * (*gc_mark_hook) | |
5587 | PARAMS ((bfd *, struct bfd_link_info *, Elf_Internal_Rela *, | |
5588 | struct elf_link_hash_entry *, Elf_Internal_Sym *)); | |
5589 | { | |
5590 | boolean ret = true; | |
5591 | ||
5592 | sec->gc_mark = 1; | |
5593 | ||
5594 | /* Look through the section relocs. */ | |
5595 | ||
5596 | if ((sec->flags & SEC_RELOC) != 0 && sec->reloc_count > 0) | |
5597 | { | |
5598 | Elf_Internal_Rela *relstart, *rel, *relend; | |
5599 | Elf_Internal_Shdr *symtab_hdr; | |
5600 | struct elf_link_hash_entry **sym_hashes; | |
5601 | size_t nlocsyms; | |
5602 | size_t extsymoff; | |
5603 | Elf_External_Sym *locsyms, *freesyms = NULL; | |
5604 | bfd *input_bfd = sec->owner; | |
5605 | ||
5606 | /* GCFIXME: how to arrange so that relocs and symbols are not | |
5607 | reread continually? */ | |
5608 | ||
5609 | symtab_hdr = &elf_tdata (input_bfd)->symtab_hdr; | |
5610 | sym_hashes = elf_sym_hashes (input_bfd); | |
5611 | ||
5612 | /* Read the local symbols. */ | |
5613 | if (elf_bad_symtab (input_bfd)) | |
5614 | { | |
5615 | nlocsyms = symtab_hdr->sh_size / sizeof (Elf_External_Sym); | |
5616 | extsymoff = 0; | |
5617 | } | |
5618 | else | |
5619 | extsymoff = nlocsyms = symtab_hdr->sh_info; | |
5620 | if (symtab_hdr->contents) | |
5621 | locsyms = (Elf_External_Sym *) symtab_hdr->contents; | |
5622 | else if (nlocsyms == 0) | |
5623 | locsyms = NULL; | |
5624 | else | |
5625 | { | |
5626 | locsyms = freesyms = | |
5627 | bfd_malloc (nlocsyms * sizeof (Elf_External_Sym)); | |
5628 | if (freesyms == NULL | |
5629 | || bfd_seek (input_bfd, symtab_hdr->sh_offset, SEEK_SET) != 0 | |
5630 | || (bfd_read (locsyms, sizeof (Elf_External_Sym), | |
5631 | nlocsyms, input_bfd) | |
5632 | != nlocsyms * sizeof (Elf_External_Sym))) | |
5633 | { | |
5634 | ret = false; | |
5635 | goto out1; | |
5636 | } | |
5637 | } | |
5638 | ||
5639 | /* Read the relocations. */ | |
5640 | relstart = (NAME(_bfd_elf,link_read_relocs) | |
5641 | (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, | |
5642 | info->keep_memory)); | |
5643 | if (relstart == NULL) | |
5644 | { | |
5645 | ret = false; | |
5646 | goto out1; | |
5647 | } | |
5648 | relend = relstart + sec->reloc_count; | |
5649 | ||
5650 | for (rel = relstart; rel < relend; rel++) | |
5651 | { | |
5652 | unsigned long r_symndx; | |
5653 | asection *rsec; | |
5654 | struct elf_link_hash_entry *h; | |
5655 | Elf_Internal_Sym s; | |
5656 | ||
5657 | r_symndx = ELF_R_SYM (rel->r_info); | |
5658 | if (r_symndx == 0) | |
5659 | continue; | |
5660 | ||
5661 | if (elf_bad_symtab (sec->owner)) | |
5662 | { | |
5663 | elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s); | |
5664 | if (ELF_ST_BIND (s.st_info) == STB_LOCAL) | |
5665 | rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s); | |
5666 | else | |
5667 | { | |
5668 | h = sym_hashes[r_symndx - extsymoff]; | |
5669 | rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL); | |
5670 | } | |
5671 | } | |
5672 | else if (r_symndx >= nlocsyms) | |
5673 | { | |
5674 | h = sym_hashes[r_symndx - extsymoff]; | |
5675 | rsec = (*gc_mark_hook)(sec->owner, info, rel, h, NULL); | |
5676 | } | |
5677 | else | |
5678 | { | |
5679 | elf_swap_symbol_in (input_bfd, &locsyms[r_symndx], &s); | |
5680 | rsec = (*gc_mark_hook)(sec->owner, info, rel, NULL, &s); | |
5681 | } | |
5682 | ||
5683 | if (rsec && !rsec->gc_mark) | |
5684 | if (!elf_gc_mark (info, rsec, gc_mark_hook)) | |
5685 | { | |
5686 | ret = false; | |
5687 | goto out2; | |
5688 | } | |
5689 | } | |
5690 | ||
5691 | out2: | |
5692 | if (!info->keep_memory) | |
5693 | free (relstart); | |
5694 | out1: | |
5695 | if (freesyms) | |
5696 | free (freesyms); | |
5697 | } | |
5698 | ||
5699 | return ret; | |
5700 | } | |
5701 | ||
5702 | /* The sweep phase of garbage collection. Remove all garbage sections. */ | |
5703 | ||
5704 | static boolean | |
5705 | elf_gc_sweep (info, gc_sweep_hook) | |
5706 | struct bfd_link_info *info; | |
5707 | boolean (*gc_sweep_hook) | |
5708 | PARAMS ((bfd *abfd, struct bfd_link_info *info, asection *o, | |
5709 | const Elf_Internal_Rela *relocs)); | |
5710 | { | |
5711 | bfd *sub; | |
5712 | ||
5713 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) | |
5714 | { | |
5715 | asection *o; | |
5716 | ||
5717 | for (o = sub->sections; o != NULL; o = o->next) | |
5718 | { | |
5719 | /* Keep special sections. Keep .debug sections. */ | |
5720 | if ((o->flags & SEC_LINKER_CREATED) | |
5721 | || (o->flags & SEC_DEBUGGING)) | |
5722 | o->gc_mark = 1; | |
5723 | ||
5724 | if (o->gc_mark) | |
5725 | continue; | |
5726 | ||
5727 | /* Skip sweeping sections already excluded. */ | |
5728 | if (o->flags & SEC_EXCLUDE) | |
5729 | continue; | |
5730 | ||
5731 | /* Since this is early in the link process, it is simple | |
5732 | to remove a section from the output. */ | |
5733 | o->flags |= SEC_EXCLUDE; | |
5734 | ||
5735 | /* But we also have to update some of the relocation | |
5736 | info we collected before. */ | |
5737 | if (gc_sweep_hook | |
5738 | && (o->flags & SEC_RELOC) && o->reloc_count > 0) | |
5739 | { | |
5740 | Elf_Internal_Rela *internal_relocs; | |
5741 | boolean r; | |
5742 | ||
5743 | internal_relocs = (NAME(_bfd_elf,link_read_relocs) | |
5744 | (o->owner, o, NULL, NULL, info->keep_memory)); | |
5745 | if (internal_relocs == NULL) | |
5746 | return false; | |
5747 | ||
5748 | r = (*gc_sweep_hook)(o->owner, info, o, internal_relocs); | |
5749 | ||
5750 | if (!info->keep_memory) | |
5751 | free (internal_relocs); | |
5752 | ||
5753 | if (!r) | |
5754 | return false; | |
5755 | } | |
5756 | } | |
5757 | } | |
5758 | ||
5759 | /* Remove the symbols that were in the swept sections from the dynamic | |
5760 | symbol table. GCFIXME: Anyone know how to get them out of the | |
5761 | static symbol table as well? */ | |
5762 | { | |
5763 | int i = 0; | |
5764 | ||
5765 | elf_link_hash_traverse (elf_hash_table (info), | |
5766 | elf_gc_sweep_symbol, | |
5767 | (PTR) &i); | |
5768 | ||
5769 | elf_hash_table (info)->dynsymcount = i; | |
5770 | } | |
5771 | ||
5772 | return true; | |
5773 | } | |
5774 | ||
5775 | /* Sweep symbols in swept sections. Called via elf_link_hash_traverse. */ | |
5776 | ||
5777 | static boolean | |
5778 | elf_gc_sweep_symbol (h, idxptr) | |
5779 | struct elf_link_hash_entry *h; | |
5780 | PTR idxptr; | |
5781 | { | |
5782 | int *idx = (int *) idxptr; | |
5783 | ||
5784 | if (h->dynindx != -1 | |
5785 | && ((h->root.type != bfd_link_hash_defined | |
5786 | && h->root.type != bfd_link_hash_defweak) | |
5787 | || h->root.u.def.section->gc_mark)) | |
5788 | h->dynindx = (*idx)++; | |
5789 | ||
5790 | return true; | |
5791 | } | |
5792 | ||
5793 | /* Propogate collected vtable information. This is called through | |
5794 | elf_link_hash_traverse. */ | |
5795 | ||
5796 | static boolean | |
5797 | elf_gc_propagate_vtable_entries_used (h, okp) | |
5798 | struct elf_link_hash_entry *h; | |
5799 | PTR okp; | |
5800 | { | |
5801 | /* Those that are not vtables. */ | |
5802 | if (h->vtable_parent == NULL) | |
5803 | return true; | |
5804 | ||
5805 | /* Those vtables that do not have parents, we cannot merge. */ | |
5806 | if (h->vtable_parent == (struct elf_link_hash_entry *) -1) | |
5807 | return true; | |
5808 | ||
5809 | /* If we've already been done, exit. */ | |
5810 | if (h->vtable_entries_used && h->vtable_entries_used[-1]) | |
5811 | return true; | |
5812 | ||
5813 | /* Make sure the parent's table is up to date. */ | |
5814 | elf_gc_propagate_vtable_entries_used (h->vtable_parent, okp); | |
5815 | ||
5816 | if (h->vtable_entries_used == NULL) | |
5817 | { | |
5818 | /* None of this table's entries were referenced. Re-use the | |
5819 | parent's table. */ | |
5820 | h->vtable_entries_used = h->vtable_parent->vtable_entries_used; | |
5821 | h->vtable_entries_size = h->vtable_parent->vtable_entries_size; | |
5822 | } | |
5823 | else | |
5824 | { | |
5825 | size_t n; | |
5826 | boolean *cu, *pu; | |
5827 | ||
5828 | /* Or the parent's entries into ours. */ | |
5829 | cu = h->vtable_entries_used; | |
5830 | cu[-1] = true; | |
5831 | pu = h->vtable_parent->vtable_entries_used; | |
5832 | if (pu != NULL) | |
5833 | { | |
5834 | n = h->vtable_parent->vtable_entries_size / FILE_ALIGN; | |
5835 | while (--n != 0) | |
5836 | { | |
5837 | if (*pu) *cu = true; | |
5838 | pu++, cu++; | |
5839 | } | |
5840 | } | |
5841 | } | |
5842 | ||
5843 | return true; | |
5844 | } | |
5845 | ||
5846 | static boolean | |
5847 | elf_gc_smash_unused_vtentry_relocs (h, okp) | |
5848 | struct elf_link_hash_entry *h; | |
5849 | PTR okp; | |
5850 | { | |
5851 | asection *sec; | |
5852 | bfd_vma hstart, hend; | |
5853 | Elf_Internal_Rela *relstart, *relend, *rel; | |
5854 | ||
5855 | /* Take care of both those symbols that do not describe vtables as | |
5856 | well as those that are not loaded. */ | |
5857 | if (h->vtable_parent == NULL) | |
5858 | return true; | |
5859 | ||
5860 | BFD_ASSERT (h->root.type == bfd_link_hash_defined | |
5861 | || h->root.type == bfd_link_hash_defweak); | |
5862 | ||
5863 | sec = h->root.u.def.section; | |
5864 | hstart = h->root.u.def.value; | |
5865 | hend = hstart + h->size; | |
5866 | ||
5867 | relstart = (NAME(_bfd_elf,link_read_relocs) | |
5868 | (sec->owner, sec, NULL, (Elf_Internal_Rela *) NULL, true)); | |
5869 | if (!relstart) | |
5870 | return *(boolean *)okp = false; | |
5871 | relend = relstart + sec->reloc_count; | |
5872 | ||
5873 | for (rel = relstart; rel < relend; ++rel) | |
5874 | if (rel->r_offset >= hstart && rel->r_offset < hend) | |
5875 | { | |
5876 | /* If the entry is in use, do nothing. */ | |
5877 | if (h->vtable_entries_used | |
5878 | && (rel->r_offset - hstart) < h->vtable_entries_size) | |
5879 | { | |
5880 | bfd_vma entry = (rel->r_offset - hstart) / FILE_ALIGN; | |
5881 | if (h->vtable_entries_used[entry]) | |
5882 | continue; | |
5883 | } | |
5884 | /* Otherwise, kill it. */ | |
5885 | rel->r_offset = rel->r_info = rel->r_addend = 0; | |
5886 | } | |
5887 | ||
5888 | return true; | |
5889 | } | |
5890 | ||
5891 | /* Do mark and sweep of unused sections. */ | |
5892 | ||
5893 | boolean | |
5894 | elf_gc_sections (abfd, info) | |
5895 | bfd *abfd; | |
5896 | struct bfd_link_info *info; | |
5897 | { | |
5898 | boolean ok = true; | |
5899 | bfd *sub; | |
5900 | asection * (*gc_mark_hook) | |
5901 | PARAMS ((bfd *abfd, struct bfd_link_info *, Elf_Internal_Rela *, | |
5902 | struct elf_link_hash_entry *h, Elf_Internal_Sym *)); | |
5903 | ||
5904 | if (!get_elf_backend_data (abfd)->can_gc_sections | |
5905 | || info->relocateable | |
5906 | || elf_hash_table (info)->dynamic_sections_created) | |
5907 | return true; | |
5908 | ||
5909 | /* Apply transitive closure to the vtable entry usage info. */ | |
5910 | elf_link_hash_traverse (elf_hash_table (info), | |
5911 | elf_gc_propagate_vtable_entries_used, | |
5912 | (PTR) &ok); | |
5913 | if (!ok) | |
5914 | return false; | |
5915 | ||
5916 | /* Kill the vtable relocations that were not used. */ | |
5917 | elf_link_hash_traverse (elf_hash_table (info), | |
5918 | elf_gc_smash_unused_vtentry_relocs, | |
5919 | (PTR) &ok); | |
5920 | if (!ok) | |
5921 | return false; | |
5922 | ||
5923 | /* Grovel through relocs to find out who stays ... */ | |
5924 | ||
5925 | gc_mark_hook = get_elf_backend_data (abfd)->gc_mark_hook; | |
5926 | for (sub = info->input_bfds; sub != NULL; sub = sub->link_next) | |
5927 | { | |
5928 | asection *o; | |
5929 | for (o = sub->sections; o != NULL; o = o->next) | |
5930 | { | |
5931 | if (o->flags & SEC_KEEP) | |
5932 | if (!elf_gc_mark (info, o, gc_mark_hook)) | |
5933 | return false; | |
5934 | } | |
5935 | } | |
5936 | ||
5937 | /* ... and mark SEC_EXCLUDE for those that go. */ | |
5938 | if (!elf_gc_sweep(info, get_elf_backend_data (abfd)->gc_sweep_hook)) | |
5939 | return false; | |
5940 | ||
5941 | return true; | |
5942 | } | |
5943 | \f | |
5944 | /* Called from check_relocs to record the existance of a VTINHERIT reloc. */ | |
5945 | ||
5946 | boolean | |
5947 | elf_gc_record_vtinherit (abfd, sec, h, offset) | |
5948 | bfd *abfd; | |
5949 | asection *sec; | |
5950 | struct elf_link_hash_entry *h; | |
5951 | bfd_vma offset; | |
5952 | { | |
5953 | struct elf_link_hash_entry **sym_hashes, **sym_hashes_end; | |
5954 | struct elf_link_hash_entry **search, *child; | |
5955 | bfd_size_type extsymcount; | |
5956 | ||
5957 | /* The sh_info field of the symtab header tells us where the | |
5958 | external symbols start. We don't care about the local symbols at | |
5959 | this point. */ | |
5960 | extsymcount = elf_tdata (abfd)->symtab_hdr.sh_size/sizeof (Elf_External_Sym); | |
5961 | if (!elf_bad_symtab (abfd)) | |
5962 | extsymcount -= elf_tdata (abfd)->symtab_hdr.sh_info; | |
5963 | ||
5964 | sym_hashes = elf_sym_hashes (abfd); | |
5965 | sym_hashes_end = sym_hashes + extsymcount; | |
5966 | ||
5967 | /* Hunt down the child symbol, which is in this section at the same | |
5968 | offset as the relocation. */ | |
5969 | for (search = sym_hashes; search != sym_hashes_end; ++search) | |
5970 | { | |
5971 | if ((child = *search) != NULL | |
5972 | && (child->root.type == bfd_link_hash_defined | |
5973 | || child->root.type == bfd_link_hash_defweak) | |
5974 | && child->root.u.def.section == sec | |
5975 | && child->root.u.def.value == offset) | |
5976 | goto win; | |
5977 | } | |
5978 | ||
5979 | (*_bfd_error_handler) ("%s: %s+%lu: No symbol found for INHERIT", | |
5980 | bfd_get_filename (abfd), sec->name, | |
5981 | (unsigned long)offset); | |
5982 | bfd_set_error (bfd_error_invalid_operation); | |
5983 | return false; | |
5984 | ||
5985 | win: | |
5986 | if (!h) | |
5987 | { | |
5988 | /* This *should* only be the absolute section. It could potentially | |
5989 | be that someone has defined a non-global vtable though, which | |
5990 | would be bad. It isn't worth paging in the local symbols to be | |
5991 | sure though; that case should simply be handled by the assembler. */ | |
5992 | ||
5993 | child->vtable_parent = (struct elf_link_hash_entry *) -1; | |
5994 | } | |
5995 | else | |
5996 | child->vtable_parent = h; | |
5997 | ||
5998 | return true; | |
5999 | } | |
6000 | ||
6001 | /* Called from check_relocs to record the existance of a VTENTRY reloc. */ | |
6002 | ||
6003 | boolean | |
6004 | elf_gc_record_vtentry (abfd, sec, h, addend) | |
6005 | bfd *abfd; | |
6006 | asection *sec; | |
6007 | struct elf_link_hash_entry *h; | |
6008 | bfd_vma addend; | |
6009 | { | |
6010 | if (addend >= h->vtable_entries_size) | |
6011 | { | |
6012 | size_t size, bytes; | |
6013 | boolean *ptr = h->vtable_entries_used; | |
6014 | ||
6015 | /* While the symbol is undefined, we have to be prepared to handle | |
6016 | a zero size. */ | |
6017 | if (h->root.type == bfd_link_hash_undefined) | |
6018 | size = addend; | |
6019 | else | |
6020 | { | |
6021 | size = h->size; | |
6022 | if (size < addend) | |
6023 | { | |
6024 | /* Oops! We've got a reference past the defined end of | |
6025 | the table. This is probably a bug -- shall we warn? */ | |
6026 | size = addend; | |
6027 | } | |
6028 | } | |
6029 | ||
6030 | /* Allocate one extra entry for use as a "done" flag for the | |
6031 | consolidation pass. */ | |
6032 | bytes = (size / FILE_ALIGN + 1) * sizeof(boolean); | |
6033 | ||
6034 | if (ptr) | |
6035 | { | |
6036 | size_t oldbytes; | |
6037 | ||
6038 | ptr = realloc (ptr-1, bytes); | |
6039 | if (ptr == NULL) | |
6040 | return false; | |
6041 | ||
6042 | oldbytes = (h->vtable_entries_size/FILE_ALIGN + 1) * sizeof(boolean); | |
6043 | memset (ptr + oldbytes, 0, bytes - oldbytes); | |
6044 | } | |
6045 | else | |
6046 | { | |
6047 | ptr = calloc (1, bytes); | |
6048 | if (ptr == NULL) | |
6049 | return false; | |
6050 | } | |
6051 | ||
6052 | /* And arrange for that done flag to be at index -1. */ | |
6053 | h->vtable_entries_used = ptr+1; | |
6054 | h->vtable_entries_size = size; | |
6055 | } | |
6056 | h->vtable_entries_used[addend / FILE_ALIGN] = true; | |
6057 | ||
6058 | return true; | |
6059 | } | |
6060 | ||
6061 | /* And an accompanying bit to work out final got entry offsets once | |
6062 | we're done. Should be called from final_link. */ | |
6063 | ||
6064 | boolean | |
6065 | elf_gc_common_finalize_got_offsets (abfd, info) | |
6066 | bfd *abfd; | |
6067 | struct bfd_link_info *info; | |
6068 | { | |
6069 | bfd *i; | |
6070 | struct elf_backend_data *bed = get_elf_backend_data (abfd); | |
6071 | bfd_vma gotoff; | |
6072 | ||
6073 | /* The GOT offset is relative to the .got section, but the GOT header is | |
6074 | put into the .got.plt section, if the backend uses it. */ | |
6075 | if (bed->want_got_plt) | |
6076 | gotoff = 0; | |
6077 | else | |
6078 | gotoff = bed->got_header_size; | |
6079 | ||
6080 | /* Do the local .got entries first. */ | |
6081 | for (i = info->input_bfds; i; i = i->link_next) | |
6082 | { | |
6083 | bfd_signed_vma *local_got = elf_local_got_refcounts (i); | |
6084 | bfd_size_type j, locsymcount; | |
6085 | Elf_Internal_Shdr *symtab_hdr; | |
6086 | ||
6087 | if (!local_got) | |
6088 | continue; | |
6089 | ||
6090 | symtab_hdr = &elf_tdata (i)->symtab_hdr; | |
6091 | if (elf_bad_symtab (i)) | |
6092 | locsymcount = symtab_hdr->sh_size / sizeof (Elf_External_Sym); | |
6093 | else | |
6094 | locsymcount = symtab_hdr->sh_info; | |
6095 | ||
6096 | for (j = 0; j < locsymcount; ++j) | |
6097 | { | |
6098 | if (local_got[j] > 0) | |
6099 | { | |
6100 | local_got[j] = gotoff; | |
6101 | gotoff += ARCH_SIZE / 8; | |
6102 | } | |
6103 | else | |
6104 | local_got[j] = (bfd_vma) -1; | |
6105 | } | |
6106 | } | |
6107 | ||
6108 | /* Then the global .got and .plt entries. */ | |
6109 | elf_link_hash_traverse (elf_hash_table (info), | |
6110 | elf_gc_allocate_got_offsets, | |
6111 | (PTR) &gotoff); | |
6112 | return true; | |
6113 | } | |
6114 | ||
6115 | /* We need a special top-level link routine to convert got reference counts | |
6116 | to real got offsets. */ | |
6117 | ||
6118 | static boolean | |
6119 | elf_gc_allocate_got_offsets (h, offarg) | |
6120 | struct elf_link_hash_entry *h; | |
6121 | PTR offarg; | |
6122 | { | |
6123 | bfd_vma *off = (bfd_vma *) offarg; | |
6124 | ||
6125 | if (h->got.refcount > 0) | |
6126 | { | |
6127 | h->got.offset = off[0]; | |
6128 | off[0] += ARCH_SIZE / 8; | |
6129 | } | |
6130 | else | |
6131 | h->got.offset = (bfd_vma) -1; | |
6132 | ||
6133 | return true; | |
6134 | } | |
6135 | ||
6136 | /* Many folk need no more in the way of final link than this, once | |
6137 | got entry reference counting is enabled. */ | |
6138 | ||
6139 | boolean | |
6140 | elf_gc_common_final_link (abfd, info) | |
6141 | bfd *abfd; | |
6142 | struct bfd_link_info *info; | |
6143 | { | |
6144 | if (!elf_gc_common_finalize_got_offsets (abfd, info)) | |
6145 | return false; | |
6146 | ||
6147 | /* Invoke the regular ELF backend linker to do all the work. */ | |
6148 | return elf_bfd_final_link (abfd, info); | |
6149 | } | |
6150 | ||
6151 | /* This function will be called though elf_link_hash_traverse to store | |
6152 | all hash value of the exported symbols in an array. */ | |
6153 | ||
6154 | static boolean | |
6155 | elf_collect_hash_codes (h, data) | |
6156 | struct elf_link_hash_entry *h; | |
6157 | PTR data; | |
6158 | { | |
6159 | unsigned long **valuep = (unsigned long **) data; | |
6160 | const char *name; | |
6161 | char *p; | |
6162 | unsigned long ha; | |
6163 | char *alc = NULL; | |
6164 | ||
6165 | /* Ignore indirect symbols. These are added by the versioning code. */ | |
6166 | if (h->dynindx == -1) | |
6167 | return true; | |
6168 | ||
6169 | name = h->root.root.string; | |
6170 | p = strchr (name, ELF_VER_CHR); | |
6171 | if (p != NULL) | |
6172 | { | |
6173 | alc = bfd_malloc (p - name + 1); | |
6174 | memcpy (alc, name, p - name); | |
6175 | alc[p - name] = '\0'; | |
6176 | name = alc; | |
6177 | } | |
6178 | ||
6179 | /* Compute the hash value. */ | |
6180 | ha = bfd_elf_hash (name); | |
6181 | ||
6182 | /* Store the found hash value in the array given as the argument. */ | |
6183 | *(*valuep)++ = ha; | |
6184 | ||
6185 | /* And store it in the struct so that we can put it in the hash table | |
6186 | later. */ | |
6187 | h->elf_hash_value = ha; | |
6188 | ||
6189 | if (alc != NULL) | |
6190 | free (alc); | |
6191 | ||
6192 | return true; | |
6193 | } |