Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* ELF linking support for BFD. |
aad5d350 | 2 | Copyright 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 |
7898deda | 3 | Free Software Foundation, Inc. |
252b5132 RH |
4 | |
5 | This file is part of BFD, the Binary File Descriptor library. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "bfd.h" | |
22 | #include "sysdep.h" | |
23 | #include "bfdlink.h" | |
24 | #include "libbfd.h" | |
25 | #define ARCH_SIZE 0 | |
26 | #include "elf-bfd.h" | |
27 | ||
b34976b6 | 28 | bfd_boolean |
268b6b39 | 29 | _bfd_elf_create_got_section (bfd *abfd, struct bfd_link_info *info) |
252b5132 RH |
30 | { |
31 | flagword flags; | |
aad5d350 | 32 | asection *s; |
252b5132 | 33 | struct elf_link_hash_entry *h; |
14a793b2 | 34 | struct bfd_link_hash_entry *bh; |
9c5bfbb7 | 35 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
252b5132 RH |
36 | int ptralign; |
37 | ||
38 | /* This function may be called more than once. */ | |
aad5d350 AM |
39 | s = bfd_get_section_by_name (abfd, ".got"); |
40 | if (s != NULL && (s->flags & SEC_LINKER_CREATED) != 0) | |
b34976b6 | 41 | return TRUE; |
252b5132 RH |
42 | |
43 | switch (bed->s->arch_size) | |
44 | { | |
bb0deeff AO |
45 | case 32: |
46 | ptralign = 2; | |
47 | break; | |
48 | ||
49 | case 64: | |
50 | ptralign = 3; | |
51 | break; | |
52 | ||
53 | default: | |
54 | bfd_set_error (bfd_error_bad_value); | |
b34976b6 | 55 | return FALSE; |
252b5132 RH |
56 | } |
57 | ||
58 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
59 | | SEC_LINKER_CREATED); | |
60 | ||
61 | s = bfd_make_section (abfd, ".got"); | |
62 | if (s == NULL | |
63 | || !bfd_set_section_flags (abfd, s, flags) | |
64 | || !bfd_set_section_alignment (abfd, s, ptralign)) | |
b34976b6 | 65 | return FALSE; |
252b5132 RH |
66 | |
67 | if (bed->want_got_plt) | |
68 | { | |
69 | s = bfd_make_section (abfd, ".got.plt"); | |
70 | if (s == NULL | |
71 | || !bfd_set_section_flags (abfd, s, flags) | |
72 | || !bfd_set_section_alignment (abfd, s, ptralign)) | |
b34976b6 | 73 | return FALSE; |
252b5132 RH |
74 | } |
75 | ||
2517a57f AM |
76 | if (bed->want_got_sym) |
77 | { | |
78 | /* Define the symbol _GLOBAL_OFFSET_TABLE_ at the start of the .got | |
79 | (or .got.plt) section. We don't do this in the linker script | |
80 | because we don't want to define the symbol if we are not creating | |
81 | a global offset table. */ | |
14a793b2 | 82 | bh = NULL; |
2517a57f AM |
83 | if (!(_bfd_generic_link_add_one_symbol |
84 | (info, abfd, "_GLOBAL_OFFSET_TABLE_", BSF_GLOBAL, s, | |
268b6b39 | 85 | bed->got_symbol_offset, NULL, FALSE, bed->collect, &bh))) |
b34976b6 | 86 | return FALSE; |
14a793b2 | 87 | h = (struct elf_link_hash_entry *) bh; |
2517a57f AM |
88 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; |
89 | h->type = STT_OBJECT; | |
252b5132 | 90 | |
36af4a4e | 91 | if (! info->executable |
2517a57f | 92 | && ! _bfd_elf_link_record_dynamic_symbol (info, h)) |
b34976b6 | 93 | return FALSE; |
252b5132 | 94 | |
2517a57f AM |
95 | elf_hash_table (info)->hgot = h; |
96 | } | |
252b5132 RH |
97 | |
98 | /* The first bit of the global offset table is the header. */ | |
99 | s->_raw_size += bed->got_header_size + bed->got_symbol_offset; | |
100 | ||
b34976b6 | 101 | return TRUE; |
252b5132 RH |
102 | } |
103 | \f | |
45d6a902 AM |
104 | /* Create some sections which will be filled in with dynamic linking |
105 | information. ABFD is an input file which requires dynamic sections | |
106 | to be created. The dynamic sections take up virtual memory space | |
107 | when the final executable is run, so we need to create them before | |
108 | addresses are assigned to the output sections. We work out the | |
109 | actual contents and size of these sections later. */ | |
252b5132 | 110 | |
b34976b6 | 111 | bfd_boolean |
268b6b39 | 112 | _bfd_elf_link_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
252b5132 | 113 | { |
45d6a902 AM |
114 | flagword flags; |
115 | register asection *s; | |
116 | struct elf_link_hash_entry *h; | |
117 | struct bfd_link_hash_entry *bh; | |
9c5bfbb7 | 118 | const struct elf_backend_data *bed; |
252b5132 | 119 | |
45d6a902 AM |
120 | if (! is_elf_hash_table (info)) |
121 | return FALSE; | |
122 | ||
123 | if (elf_hash_table (info)->dynamic_sections_created) | |
124 | return TRUE; | |
125 | ||
126 | /* Make sure that all dynamic sections use the same input BFD. */ | |
127 | if (elf_hash_table (info)->dynobj == NULL) | |
128 | elf_hash_table (info)->dynobj = abfd; | |
129 | else | |
130 | abfd = elf_hash_table (info)->dynobj; | |
131 | ||
132 | /* Note that we set the SEC_IN_MEMORY flag for all of these | |
133 | sections. */ | |
134 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | |
135 | | SEC_IN_MEMORY | SEC_LINKER_CREATED); | |
136 | ||
137 | /* A dynamically linked executable has a .interp section, but a | |
138 | shared library does not. */ | |
36af4a4e | 139 | if (info->executable) |
252b5132 | 140 | { |
45d6a902 AM |
141 | s = bfd_make_section (abfd, ".interp"); |
142 | if (s == NULL | |
143 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)) | |
144 | return FALSE; | |
145 | } | |
bb0deeff | 146 | |
45d6a902 AM |
147 | if (! info->traditional_format |
148 | && info->hash->creator->flavour == bfd_target_elf_flavour) | |
149 | { | |
150 | s = bfd_make_section (abfd, ".eh_frame_hdr"); | |
151 | if (s == NULL | |
152 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
153 | || ! bfd_set_section_alignment (abfd, s, 2)) | |
154 | return FALSE; | |
155 | elf_hash_table (info)->eh_info.hdr_sec = s; | |
156 | } | |
bb0deeff | 157 | |
45d6a902 AM |
158 | bed = get_elf_backend_data (abfd); |
159 | ||
160 | /* Create sections to hold version informations. These are removed | |
161 | if they are not needed. */ | |
162 | s = bfd_make_section (abfd, ".gnu.version_d"); | |
163 | if (s == NULL | |
164 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
165 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
166 | return FALSE; | |
167 | ||
168 | s = bfd_make_section (abfd, ".gnu.version"); | |
169 | if (s == NULL | |
170 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
171 | || ! bfd_set_section_alignment (abfd, s, 1)) | |
172 | return FALSE; | |
173 | ||
174 | s = bfd_make_section (abfd, ".gnu.version_r"); | |
175 | if (s == NULL | |
176 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
177 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
178 | return FALSE; | |
179 | ||
180 | s = bfd_make_section (abfd, ".dynsym"); | |
181 | if (s == NULL | |
182 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
183 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
184 | return FALSE; | |
185 | ||
186 | s = bfd_make_section (abfd, ".dynstr"); | |
187 | if (s == NULL | |
188 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY)) | |
189 | return FALSE; | |
190 | ||
191 | /* Create a strtab to hold the dynamic symbol names. */ | |
192 | if (elf_hash_table (info)->dynstr == NULL) | |
193 | { | |
194 | elf_hash_table (info)->dynstr = _bfd_elf_strtab_init (); | |
195 | if (elf_hash_table (info)->dynstr == NULL) | |
196 | return FALSE; | |
252b5132 RH |
197 | } |
198 | ||
45d6a902 AM |
199 | s = bfd_make_section (abfd, ".dynamic"); |
200 | if (s == NULL | |
201 | || ! bfd_set_section_flags (abfd, s, flags) | |
202 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
203 | return FALSE; | |
204 | ||
205 | /* The special symbol _DYNAMIC is always set to the start of the | |
206 | .dynamic section. This call occurs before we have processed the | |
207 | symbols for any dynamic object, so we don't have to worry about | |
208 | overriding a dynamic definition. We could set _DYNAMIC in a | |
209 | linker script, but we only want to define it if we are, in fact, | |
210 | creating a .dynamic section. We don't want to define it if there | |
211 | is no .dynamic section, since on some ELF platforms the start up | |
212 | code examines it to decide how to initialize the process. */ | |
213 | bh = NULL; | |
214 | if (! (_bfd_generic_link_add_one_symbol | |
268b6b39 AM |
215 | (info, abfd, "_DYNAMIC", BSF_GLOBAL, s, 0, NULL, FALSE, |
216 | get_elf_backend_data (abfd)->collect, &bh))) | |
45d6a902 AM |
217 | return FALSE; |
218 | h = (struct elf_link_hash_entry *) bh; | |
219 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
220 | h->type = STT_OBJECT; | |
221 | ||
36af4a4e | 222 | if (! info->executable |
45d6a902 AM |
223 | && ! _bfd_elf_link_record_dynamic_symbol (info, h)) |
224 | return FALSE; | |
225 | ||
226 | s = bfd_make_section (abfd, ".hash"); | |
227 | if (s == NULL | |
228 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
229 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) | |
230 | return FALSE; | |
231 | elf_section_data (s)->this_hdr.sh_entsize = bed->s->sizeof_hash_entry; | |
232 | ||
233 | /* Let the backend create the rest of the sections. This lets the | |
234 | backend set the right flags. The backend will normally create | |
235 | the .got and .plt sections. */ | |
236 | if (! (*bed->elf_backend_create_dynamic_sections) (abfd, info)) | |
237 | return FALSE; | |
238 | ||
239 | elf_hash_table (info)->dynamic_sections_created = TRUE; | |
240 | ||
241 | return TRUE; | |
242 | } | |
243 | ||
244 | /* Create dynamic sections when linking against a dynamic object. */ | |
245 | ||
246 | bfd_boolean | |
268b6b39 | 247 | _bfd_elf_create_dynamic_sections (bfd *abfd, struct bfd_link_info *info) |
45d6a902 AM |
248 | { |
249 | flagword flags, pltflags; | |
250 | asection *s; | |
9c5bfbb7 | 251 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
45d6a902 | 252 | |
252b5132 RH |
253 | /* We need to create .plt, .rel[a].plt, .got, .got.plt, .dynbss, and |
254 | .rel[a].bss sections. */ | |
255 | ||
256 | flags = (SEC_ALLOC | SEC_LOAD | SEC_HAS_CONTENTS | SEC_IN_MEMORY | |
257 | | SEC_LINKER_CREATED); | |
258 | ||
259 | pltflags = flags; | |
260 | pltflags |= SEC_CODE; | |
261 | if (bed->plt_not_loaded) | |
5d1634d7 | 262 | pltflags &= ~ (SEC_CODE | SEC_LOAD | SEC_HAS_CONTENTS); |
252b5132 RH |
263 | if (bed->plt_readonly) |
264 | pltflags |= SEC_READONLY; | |
265 | ||
266 | s = bfd_make_section (abfd, ".plt"); | |
267 | if (s == NULL | |
268 | || ! bfd_set_section_flags (abfd, s, pltflags) | |
269 | || ! bfd_set_section_alignment (abfd, s, bed->plt_alignment)) | |
b34976b6 | 270 | return FALSE; |
252b5132 RH |
271 | |
272 | if (bed->want_plt_sym) | |
273 | { | |
274 | /* Define the symbol _PROCEDURE_LINKAGE_TABLE_ at the start of the | |
275 | .plt section. */ | |
14a793b2 AM |
276 | struct elf_link_hash_entry *h; |
277 | struct bfd_link_hash_entry *bh = NULL; | |
278 | ||
252b5132 | 279 | if (! (_bfd_generic_link_add_one_symbol |
268b6b39 AM |
280 | (info, abfd, "_PROCEDURE_LINKAGE_TABLE_", BSF_GLOBAL, s, 0, NULL, |
281 | FALSE, get_elf_backend_data (abfd)->collect, &bh))) | |
b34976b6 | 282 | return FALSE; |
14a793b2 | 283 | h = (struct elf_link_hash_entry *) bh; |
252b5132 RH |
284 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; |
285 | h->type = STT_OBJECT; | |
286 | ||
36af4a4e | 287 | if (! info->executable |
252b5132 | 288 | && ! _bfd_elf_link_record_dynamic_symbol (info, h)) |
b34976b6 | 289 | return FALSE; |
252b5132 RH |
290 | } |
291 | ||
3e932841 | 292 | s = bfd_make_section (abfd, |
bf572ba0 | 293 | bed->default_use_rela_p ? ".rela.plt" : ".rel.plt"); |
252b5132 RH |
294 | if (s == NULL |
295 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
45d6a902 | 296 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
b34976b6 | 297 | return FALSE; |
252b5132 RH |
298 | |
299 | if (! _bfd_elf_create_got_section (abfd, info)) | |
b34976b6 | 300 | return FALSE; |
252b5132 | 301 | |
3018b441 RH |
302 | if (bed->want_dynbss) |
303 | { | |
304 | /* The .dynbss section is a place to put symbols which are defined | |
305 | by dynamic objects, are referenced by regular objects, and are | |
306 | not functions. We must allocate space for them in the process | |
307 | image and use a R_*_COPY reloc to tell the dynamic linker to | |
308 | initialize them at run time. The linker script puts the .dynbss | |
309 | section into the .bss section of the final image. */ | |
310 | s = bfd_make_section (abfd, ".dynbss"); | |
311 | if (s == NULL | |
77f3d027 | 312 | || ! bfd_set_section_flags (abfd, s, SEC_ALLOC | SEC_LINKER_CREATED)) |
b34976b6 | 313 | return FALSE; |
252b5132 | 314 | |
3018b441 | 315 | /* The .rel[a].bss section holds copy relocs. This section is not |
252b5132 RH |
316 | normally needed. We need to create it here, though, so that the |
317 | linker will map it to an output section. We can't just create it | |
318 | only if we need it, because we will not know whether we need it | |
319 | until we have seen all the input files, and the first time the | |
320 | main linker code calls BFD after examining all the input files | |
321 | (size_dynamic_sections) the input sections have already been | |
322 | mapped to the output sections. If the section turns out not to | |
323 | be needed, we can discard it later. We will never need this | |
324 | section when generating a shared object, since they do not use | |
325 | copy relocs. */ | |
3018b441 RH |
326 | if (! info->shared) |
327 | { | |
3e932841 KH |
328 | s = bfd_make_section (abfd, |
329 | (bed->default_use_rela_p | |
330 | ? ".rela.bss" : ".rel.bss")); | |
3018b441 RH |
331 | if (s == NULL |
332 | || ! bfd_set_section_flags (abfd, s, flags | SEC_READONLY) | |
45d6a902 | 333 | || ! bfd_set_section_alignment (abfd, s, bed->s->log_file_align)) |
b34976b6 | 334 | return FALSE; |
3018b441 | 335 | } |
252b5132 RH |
336 | } |
337 | ||
b34976b6 | 338 | return TRUE; |
252b5132 RH |
339 | } |
340 | \f | |
252b5132 RH |
341 | /* Record a new dynamic symbol. We record the dynamic symbols as we |
342 | read the input files, since we need to have a list of all of them | |
343 | before we can determine the final sizes of the output sections. | |
344 | Note that we may actually call this function even though we are not | |
345 | going to output any dynamic symbols; in some cases we know that a | |
346 | symbol should be in the dynamic symbol table, but only if there is | |
347 | one. */ | |
348 | ||
b34976b6 | 349 | bfd_boolean |
268b6b39 AM |
350 | _bfd_elf_link_record_dynamic_symbol (struct bfd_link_info *info, |
351 | struct elf_link_hash_entry *h) | |
252b5132 RH |
352 | { |
353 | if (h->dynindx == -1) | |
354 | { | |
2b0f7ef9 | 355 | struct elf_strtab_hash *dynstr; |
68b6ddd0 | 356 | char *p; |
252b5132 | 357 | const char *name; |
252b5132 RH |
358 | bfd_size_type indx; |
359 | ||
7a13edea NC |
360 | /* XXX: The ABI draft says the linker must turn hidden and |
361 | internal symbols into STB_LOCAL symbols when producing the | |
362 | DSO. However, if ld.so honors st_other in the dynamic table, | |
363 | this would not be necessary. */ | |
364 | switch (ELF_ST_VISIBILITY (h->other)) | |
365 | { | |
366 | case STV_INTERNAL: | |
367 | case STV_HIDDEN: | |
9d6eee78 L |
368 | if (h->root.type != bfd_link_hash_undefined |
369 | && h->root.type != bfd_link_hash_undefweak) | |
38048eb9 L |
370 | { |
371 | h->elf_link_hash_flags |= ELF_LINK_FORCED_LOCAL; | |
b34976b6 | 372 | return TRUE; |
7a13edea | 373 | } |
0444bdd4 | 374 | |
7a13edea NC |
375 | default: |
376 | break; | |
377 | } | |
378 | ||
252b5132 RH |
379 | h->dynindx = elf_hash_table (info)->dynsymcount; |
380 | ++elf_hash_table (info)->dynsymcount; | |
381 | ||
382 | dynstr = elf_hash_table (info)->dynstr; | |
383 | if (dynstr == NULL) | |
384 | { | |
385 | /* Create a strtab to hold the dynamic symbol names. */ | |
2b0f7ef9 | 386 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); |
252b5132 | 387 | if (dynstr == NULL) |
b34976b6 | 388 | return FALSE; |
252b5132 RH |
389 | } |
390 | ||
391 | /* We don't put any version information in the dynamic string | |
aad5d350 | 392 | table. */ |
252b5132 RH |
393 | name = h->root.root.string; |
394 | p = strchr (name, ELF_VER_CHR); | |
68b6ddd0 AM |
395 | if (p != NULL) |
396 | /* We know that the p points into writable memory. In fact, | |
397 | there are only a few symbols that have read-only names, being | |
398 | those like _GLOBAL_OFFSET_TABLE_ that are created specially | |
399 | by the backends. Most symbols will have names pointing into | |
400 | an ELF string table read from a file, or to objalloc memory. */ | |
401 | *p = 0; | |
402 | ||
403 | indx = _bfd_elf_strtab_add (dynstr, name, p != NULL); | |
404 | ||
405 | if (p != NULL) | |
406 | *p = ELF_VER_CHR; | |
252b5132 RH |
407 | |
408 | if (indx == (bfd_size_type) -1) | |
b34976b6 | 409 | return FALSE; |
252b5132 RH |
410 | h->dynstr_index = indx; |
411 | } | |
412 | ||
b34976b6 | 413 | return TRUE; |
252b5132 | 414 | } |
45d6a902 AM |
415 | \f |
416 | /* Record an assignment to a symbol made by a linker script. We need | |
417 | this in case some dynamic object refers to this symbol. */ | |
418 | ||
419 | bfd_boolean | |
268b6b39 AM |
420 | bfd_elf_record_link_assignment (bfd *output_bfd ATTRIBUTE_UNUSED, |
421 | struct bfd_link_info *info, | |
422 | const char *name, | |
423 | bfd_boolean provide) | |
45d6a902 AM |
424 | { |
425 | struct elf_link_hash_entry *h; | |
426 | ||
427 | if (info->hash->creator->flavour != bfd_target_elf_flavour) | |
428 | return TRUE; | |
429 | ||
430 | h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, TRUE, FALSE); | |
431 | if (h == NULL) | |
432 | return FALSE; | |
433 | ||
434 | if (h->root.type == bfd_link_hash_new) | |
435 | h->elf_link_hash_flags &= ~ELF_LINK_NON_ELF; | |
436 | ||
437 | /* If this symbol is being provided by the linker script, and it is | |
438 | currently defined by a dynamic object, but not by a regular | |
439 | object, then mark it as undefined so that the generic linker will | |
440 | force the correct value. */ | |
441 | if (provide | |
442 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
443 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
444 | h->root.type = bfd_link_hash_undefined; | |
445 | ||
446 | /* If this symbol is not being provided by the linker script, and it is | |
447 | currently defined by a dynamic object, but not by a regular object, | |
448 | then clear out any version information because the symbol will not be | |
449 | associated with the dynamic object any more. */ | |
450 | if (!provide | |
451 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
452 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
453 | h->verinfo.verdef = NULL; | |
454 | ||
455 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
456 | ||
457 | if (((h->elf_link_hash_flags & (ELF_LINK_HASH_DEF_DYNAMIC | |
458 | | ELF_LINK_HASH_REF_DYNAMIC)) != 0 | |
459 | || info->shared) | |
460 | && h->dynindx == -1) | |
461 | { | |
462 | if (! _bfd_elf_link_record_dynamic_symbol (info, h)) | |
463 | return FALSE; | |
464 | ||
465 | /* If this is a weak defined symbol, and we know a corresponding | |
466 | real symbol from the same dynamic object, make sure the real | |
467 | symbol is also made into a dynamic symbol. */ | |
468 | if (h->weakdef != NULL | |
469 | && h->weakdef->dynindx == -1) | |
470 | { | |
471 | if (! _bfd_elf_link_record_dynamic_symbol (info, h->weakdef)) | |
472 | return FALSE; | |
473 | } | |
474 | } | |
475 | ||
476 | return TRUE; | |
477 | } | |
42751cf3 | 478 | |
8c58d23b AM |
479 | /* Record a new local dynamic symbol. Returns 0 on failure, 1 on |
480 | success, and 2 on a failure caused by attempting to record a symbol | |
481 | in a discarded section, eg. a discarded link-once section symbol. */ | |
482 | ||
483 | int | |
268b6b39 AM |
484 | elf_link_record_local_dynamic_symbol (struct bfd_link_info *info, |
485 | bfd *input_bfd, | |
486 | long input_indx) | |
8c58d23b AM |
487 | { |
488 | bfd_size_type amt; | |
489 | struct elf_link_local_dynamic_entry *entry; | |
490 | struct elf_link_hash_table *eht; | |
491 | struct elf_strtab_hash *dynstr; | |
492 | unsigned long dynstr_index; | |
493 | char *name; | |
494 | Elf_External_Sym_Shndx eshndx; | |
495 | char esym[sizeof (Elf64_External_Sym)]; | |
496 | ||
497 | if (! is_elf_hash_table (info)) | |
498 | return 0; | |
499 | ||
500 | /* See if the entry exists already. */ | |
501 | for (entry = elf_hash_table (info)->dynlocal; entry ; entry = entry->next) | |
502 | if (entry->input_bfd == input_bfd && entry->input_indx == input_indx) | |
503 | return 1; | |
504 | ||
505 | amt = sizeof (*entry); | |
268b6b39 | 506 | entry = bfd_alloc (input_bfd, amt); |
8c58d23b AM |
507 | if (entry == NULL) |
508 | return 0; | |
509 | ||
510 | /* Go find the symbol, so that we can find it's name. */ | |
511 | if (!bfd_elf_get_elf_syms (input_bfd, &elf_tdata (input_bfd)->symtab_hdr, | |
268b6b39 | 512 | 1, input_indx, &entry->isym, esym, &eshndx)) |
8c58d23b AM |
513 | { |
514 | bfd_release (input_bfd, entry); | |
515 | return 0; | |
516 | } | |
517 | ||
518 | if (entry->isym.st_shndx != SHN_UNDEF | |
519 | && (entry->isym.st_shndx < SHN_LORESERVE | |
520 | || entry->isym.st_shndx > SHN_HIRESERVE)) | |
521 | { | |
522 | asection *s; | |
523 | ||
524 | s = bfd_section_from_elf_index (input_bfd, entry->isym.st_shndx); | |
525 | if (s == NULL || bfd_is_abs_section (s->output_section)) | |
526 | { | |
527 | /* We can still bfd_release here as nothing has done another | |
528 | bfd_alloc. We can't do this later in this function. */ | |
529 | bfd_release (input_bfd, entry); | |
530 | return 2; | |
531 | } | |
532 | } | |
533 | ||
534 | name = (bfd_elf_string_from_elf_section | |
535 | (input_bfd, elf_tdata (input_bfd)->symtab_hdr.sh_link, | |
536 | entry->isym.st_name)); | |
537 | ||
538 | dynstr = elf_hash_table (info)->dynstr; | |
539 | if (dynstr == NULL) | |
540 | { | |
541 | /* Create a strtab to hold the dynamic symbol names. */ | |
542 | elf_hash_table (info)->dynstr = dynstr = _bfd_elf_strtab_init (); | |
543 | if (dynstr == NULL) | |
544 | return 0; | |
545 | } | |
546 | ||
b34976b6 | 547 | dynstr_index = _bfd_elf_strtab_add (dynstr, name, FALSE); |
8c58d23b AM |
548 | if (dynstr_index == (unsigned long) -1) |
549 | return 0; | |
550 | entry->isym.st_name = dynstr_index; | |
551 | ||
552 | eht = elf_hash_table (info); | |
553 | ||
554 | entry->next = eht->dynlocal; | |
555 | eht->dynlocal = entry; | |
556 | entry->input_bfd = input_bfd; | |
557 | entry->input_indx = input_indx; | |
558 | eht->dynsymcount++; | |
559 | ||
560 | /* Whatever binding the symbol had before, it's now local. */ | |
561 | entry->isym.st_info | |
562 | = ELF_ST_INFO (STB_LOCAL, ELF_ST_TYPE (entry->isym.st_info)); | |
563 | ||
564 | /* The dynindx will be set at the end of size_dynamic_sections. */ | |
565 | ||
566 | return 1; | |
567 | } | |
568 | ||
30b30c21 | 569 | /* Return the dynindex of a local dynamic symbol. */ |
42751cf3 | 570 | |
30b30c21 | 571 | long |
268b6b39 AM |
572 | _bfd_elf_link_lookup_local_dynindx (struct bfd_link_info *info, |
573 | bfd *input_bfd, | |
574 | long input_indx) | |
30b30c21 RH |
575 | { |
576 | struct elf_link_local_dynamic_entry *e; | |
577 | ||
578 | for (e = elf_hash_table (info)->dynlocal; e ; e = e->next) | |
579 | if (e->input_bfd == input_bfd && e->input_indx == input_indx) | |
580 | return e->dynindx; | |
581 | return -1; | |
582 | } | |
583 | ||
584 | /* This function is used to renumber the dynamic symbols, if some of | |
585 | them are removed because they are marked as local. This is called | |
586 | via elf_link_hash_traverse. */ | |
587 | ||
b34976b6 | 588 | static bfd_boolean |
268b6b39 AM |
589 | elf_link_renumber_hash_table_dynsyms (struct elf_link_hash_entry *h, |
590 | void *data) | |
42751cf3 | 591 | { |
268b6b39 | 592 | size_t *count = data; |
30b30c21 | 593 | |
e92d460e AM |
594 | if (h->root.type == bfd_link_hash_warning) |
595 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
596 | ||
42751cf3 | 597 | if (h->dynindx != -1) |
30b30c21 RH |
598 | h->dynindx = ++(*count); |
599 | ||
b34976b6 | 600 | return TRUE; |
42751cf3 | 601 | } |
30b30c21 | 602 | |
062e2358 | 603 | /* Assign dynsym indices. In a shared library we generate a section |
30b30c21 RH |
604 | symbol for each output section, which come first. Next come all of |
605 | the back-end allocated local dynamic syms, followed by the rest of | |
606 | the global symbols. */ | |
607 | ||
608 | unsigned long | |
268b6b39 | 609 | _bfd_elf_link_renumber_dynsyms (bfd *output_bfd, struct bfd_link_info *info) |
30b30c21 RH |
610 | { |
611 | unsigned long dynsymcount = 0; | |
612 | ||
613 | if (info->shared) | |
614 | { | |
615 | asection *p; | |
616 | for (p = output_bfd->sections; p ; p = p->next) | |
bc0ba537 AM |
617 | if ((p->flags & SEC_EXCLUDE) == 0) |
618 | elf_section_data (p)->dynindx = ++dynsymcount; | |
30b30c21 RH |
619 | } |
620 | ||
621 | if (elf_hash_table (info)->dynlocal) | |
622 | { | |
623 | struct elf_link_local_dynamic_entry *p; | |
624 | for (p = elf_hash_table (info)->dynlocal; p ; p = p->next) | |
625 | p->dynindx = ++dynsymcount; | |
626 | } | |
627 | ||
628 | elf_link_hash_traverse (elf_hash_table (info), | |
629 | elf_link_renumber_hash_table_dynsyms, | |
630 | &dynsymcount); | |
631 | ||
632 | /* There is an unused NULL entry at the head of the table which | |
633 | we must account for in our count. Unless there weren't any | |
634 | symbols, which means we'll have no table at all. */ | |
635 | if (dynsymcount != 0) | |
636 | ++dynsymcount; | |
637 | ||
638 | return elf_hash_table (info)->dynsymcount = dynsymcount; | |
639 | } | |
252b5132 | 640 | |
45d6a902 AM |
641 | /* This function is called when we want to define a new symbol. It |
642 | handles the various cases which arise when we find a definition in | |
643 | a dynamic object, or when there is already a definition in a | |
644 | dynamic object. The new symbol is described by NAME, SYM, PSEC, | |
645 | and PVALUE. We set SYM_HASH to the hash table entry. We set | |
646 | OVERRIDE if the old symbol is overriding a new definition. We set | |
647 | TYPE_CHANGE_OK if it is OK for the type to change. We set | |
648 | SIZE_CHANGE_OK if it is OK for the size to change. By OK to | |
649 | change, we mean that we shouldn't warn if the type or size does | |
650 | change. DT_NEEDED indicates if it comes from a DT_NEEDED entry of | |
651 | a shared object. */ | |
652 | ||
653 | bfd_boolean | |
268b6b39 AM |
654 | _bfd_elf_merge_symbol (bfd *abfd, |
655 | struct bfd_link_info *info, | |
656 | const char *name, | |
657 | Elf_Internal_Sym *sym, | |
658 | asection **psec, | |
659 | bfd_vma *pvalue, | |
660 | struct elf_link_hash_entry **sym_hash, | |
661 | bfd_boolean *skip, | |
662 | bfd_boolean *override, | |
663 | bfd_boolean *type_change_ok, | |
664 | bfd_boolean *size_change_ok, | |
665 | bfd_boolean dt_needed) | |
252b5132 | 666 | { |
45d6a902 AM |
667 | asection *sec; |
668 | struct elf_link_hash_entry *h; | |
669 | struct elf_link_hash_entry *flip; | |
670 | int bind; | |
671 | bfd *oldbfd; | |
672 | bfd_boolean newdyn, olddyn, olddef, newdef, newdyncommon, olddyncommon; | |
673 | bfd_boolean newweakdef, oldweakdef, newweakundef, oldweakundef; | |
674 | ||
675 | *skip = FALSE; | |
676 | *override = FALSE; | |
677 | ||
678 | sec = *psec; | |
679 | bind = ELF_ST_BIND (sym->st_info); | |
680 | ||
681 | if (! bfd_is_und_section (sec)) | |
682 | h = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, FALSE, FALSE); | |
683 | else | |
684 | h = ((struct elf_link_hash_entry *) | |
685 | bfd_wrapped_link_hash_lookup (abfd, info, name, TRUE, FALSE, FALSE)); | |
686 | if (h == NULL) | |
687 | return FALSE; | |
688 | *sym_hash = h; | |
252b5132 | 689 | |
45d6a902 AM |
690 | /* This code is for coping with dynamic objects, and is only useful |
691 | if we are doing an ELF link. */ | |
692 | if (info->hash->creator != abfd->xvec) | |
693 | return TRUE; | |
252b5132 | 694 | |
45d6a902 AM |
695 | /* For merging, we only care about real symbols. */ |
696 | ||
697 | while (h->root.type == bfd_link_hash_indirect | |
698 | || h->root.type == bfd_link_hash_warning) | |
699 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
700 | ||
701 | /* If we just created the symbol, mark it as being an ELF symbol. | |
702 | Other than that, there is nothing to do--there is no merge issue | |
703 | with a newly defined symbol--so we just return. */ | |
704 | ||
705 | if (h->root.type == bfd_link_hash_new) | |
252b5132 | 706 | { |
45d6a902 AM |
707 | h->elf_link_hash_flags &=~ ELF_LINK_NON_ELF; |
708 | return TRUE; | |
709 | } | |
252b5132 | 710 | |
45d6a902 | 711 | /* OLDBFD is a BFD associated with the existing symbol. */ |
252b5132 | 712 | |
45d6a902 AM |
713 | switch (h->root.type) |
714 | { | |
715 | default: | |
716 | oldbfd = NULL; | |
717 | break; | |
252b5132 | 718 | |
45d6a902 AM |
719 | case bfd_link_hash_undefined: |
720 | case bfd_link_hash_undefweak: | |
721 | oldbfd = h->root.u.undef.abfd; | |
722 | break; | |
723 | ||
724 | case bfd_link_hash_defined: | |
725 | case bfd_link_hash_defweak: | |
726 | oldbfd = h->root.u.def.section->owner; | |
727 | break; | |
728 | ||
729 | case bfd_link_hash_common: | |
730 | oldbfd = h->root.u.c.p->section->owner; | |
731 | break; | |
732 | } | |
733 | ||
734 | /* In cases involving weak versioned symbols, we may wind up trying | |
735 | to merge a symbol with itself. Catch that here, to avoid the | |
736 | confusion that results if we try to override a symbol with | |
737 | itself. The additional tests catch cases like | |
738 | _GLOBAL_OFFSET_TABLE_, which are regular symbols defined in a | |
739 | dynamic object, which we do want to handle here. */ | |
740 | if (abfd == oldbfd | |
741 | && ((abfd->flags & DYNAMIC) == 0 | |
742 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0)) | |
743 | return TRUE; | |
744 | ||
745 | /* NEWDYN and OLDDYN indicate whether the new or old symbol, | |
746 | respectively, is from a dynamic object. */ | |
747 | ||
748 | if ((abfd->flags & DYNAMIC) != 0) | |
749 | newdyn = TRUE; | |
750 | else | |
751 | newdyn = FALSE; | |
752 | ||
753 | if (oldbfd != NULL) | |
754 | olddyn = (oldbfd->flags & DYNAMIC) != 0; | |
755 | else | |
756 | { | |
757 | asection *hsec; | |
758 | ||
759 | /* This code handles the special SHN_MIPS_{TEXT,DATA} section | |
760 | indices used by MIPS ELF. */ | |
761 | switch (h->root.type) | |
252b5132 | 762 | { |
45d6a902 AM |
763 | default: |
764 | hsec = NULL; | |
765 | break; | |
252b5132 | 766 | |
45d6a902 AM |
767 | case bfd_link_hash_defined: |
768 | case bfd_link_hash_defweak: | |
769 | hsec = h->root.u.def.section; | |
770 | break; | |
252b5132 | 771 | |
45d6a902 AM |
772 | case bfd_link_hash_common: |
773 | hsec = h->root.u.c.p->section; | |
774 | break; | |
252b5132 | 775 | } |
252b5132 | 776 | |
45d6a902 AM |
777 | if (hsec == NULL) |
778 | olddyn = FALSE; | |
779 | else | |
780 | olddyn = (hsec->symbol->flags & BSF_DYNAMIC) != 0; | |
781 | } | |
252b5132 | 782 | |
45d6a902 AM |
783 | /* NEWDEF and OLDDEF indicate whether the new or old symbol, |
784 | respectively, appear to be a definition rather than reference. */ | |
785 | ||
786 | if (bfd_is_und_section (sec) || bfd_is_com_section (sec)) | |
787 | newdef = FALSE; | |
788 | else | |
789 | newdef = TRUE; | |
790 | ||
791 | if (h->root.type == bfd_link_hash_undefined | |
792 | || h->root.type == bfd_link_hash_undefweak | |
793 | || h->root.type == bfd_link_hash_common) | |
794 | olddef = FALSE; | |
795 | else | |
796 | olddef = TRUE; | |
797 | ||
798 | /* We need to rememeber if a symbol has a definition in a dynamic | |
799 | object or is weak in all dynamic objects. Internal and hidden | |
800 | visibility will make it unavailable to dynamic objects. */ | |
801 | if (newdyn && (h->elf_link_hash_flags & ELF_LINK_DYNAMIC_DEF) == 0) | |
802 | { | |
803 | if (!bfd_is_und_section (sec)) | |
804 | h->elf_link_hash_flags |= ELF_LINK_DYNAMIC_DEF; | |
805 | else | |
252b5132 | 806 | { |
45d6a902 AM |
807 | /* Check if this symbol is weak in all dynamic objects. If it |
808 | is the first time we see it in a dynamic object, we mark | |
809 | if it is weak. Otherwise, we clear it. */ | |
810 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) == 0) | |
811 | { | |
812 | if (bind == STB_WEAK) | |
813 | h->elf_link_hash_flags |= ELF_LINK_DYNAMIC_WEAK; | |
252b5132 | 814 | } |
45d6a902 AM |
815 | else if (bind != STB_WEAK) |
816 | h->elf_link_hash_flags &= ~ELF_LINK_DYNAMIC_WEAK; | |
252b5132 | 817 | } |
45d6a902 | 818 | } |
252b5132 | 819 | |
45d6a902 AM |
820 | /* If the old symbol has non-default visibility, we ignore the new |
821 | definition from a dynamic object. */ | |
822 | if (newdyn | |
9c7a29a3 | 823 | && ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
45d6a902 AM |
824 | && !bfd_is_und_section (sec)) |
825 | { | |
826 | *skip = TRUE; | |
827 | /* Make sure this symbol is dynamic. */ | |
828 | h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC; | |
829 | /* A protected symbol has external availability. Make sure it is | |
830 | recorded as dynamic. | |
831 | ||
832 | FIXME: Should we check type and size for protected symbol? */ | |
833 | if (ELF_ST_VISIBILITY (h->other) == STV_PROTECTED) | |
834 | return _bfd_elf_link_record_dynamic_symbol (info, h); | |
835 | else | |
836 | return TRUE; | |
837 | } | |
838 | else if (!newdyn | |
9c7a29a3 | 839 | && ELF_ST_VISIBILITY (sym->st_other) != STV_DEFAULT |
45d6a902 AM |
840 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0) |
841 | { | |
842 | /* If the new symbol with non-default visibility comes from a | |
843 | relocatable file and the old definition comes from a dynamic | |
844 | object, we remove the old definition. */ | |
845 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) | |
846 | h = *sym_hash; | |
847 | h->root.type = bfd_link_hash_new; | |
848 | h->root.u.undef.abfd = NULL; | |
849 | if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) | |
252b5132 | 850 | { |
45d6a902 | 851 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_DEF_DYNAMIC; |
22d5e339 L |
852 | h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_DYNAMIC |
853 | | ELF_LINK_DYNAMIC_DEF); | |
45d6a902 AM |
854 | } |
855 | /* FIXME: Should we check type and size for protected symbol? */ | |
856 | h->size = 0; | |
857 | h->type = 0; | |
858 | return TRUE; | |
859 | } | |
14a793b2 | 860 | |
45d6a902 AM |
861 | /* We need to treat weak definiton right, depending on if there is a |
862 | definition from a dynamic object. */ | |
863 | if (bind == STB_WEAK) | |
864 | { | |
865 | if (olddef) | |
866 | { | |
867 | newweakdef = TRUE; | |
868 | newweakundef = FALSE; | |
869 | } | |
870 | else | |
871 | { | |
872 | newweakdef = FALSE; | |
873 | newweakundef = TRUE; | |
874 | } | |
875 | } | |
876 | else | |
877 | newweakdef = newweakundef = FALSE; | |
14a793b2 | 878 | |
45d6a902 AM |
879 | /* If the new weak definition comes from a relocatable file and the |
880 | old symbol comes from a dynamic object, we treat the new one as | |
881 | strong. */ | |
882 | if (newweakdef && !newdyn && olddyn) | |
883 | newweakdef = FALSE; | |
252b5132 | 884 | |
45d6a902 AM |
885 | if (h->root.type == bfd_link_hash_defweak) |
886 | { | |
887 | oldweakdef = TRUE; | |
888 | oldweakundef = FALSE; | |
889 | } | |
890 | else if (h->root.type == bfd_link_hash_undefweak) | |
891 | { | |
892 | oldweakdef = FALSE; | |
893 | oldweakundef = TRUE; | |
894 | } | |
895 | else | |
896 | oldweakdef = oldweakundef = FALSE; | |
897 | ||
898 | /* If the old weak definition comes from a relocatable file and the | |
899 | new symbol comes from a dynamic object, we treat the old one as | |
900 | strong. */ | |
901 | if (oldweakdef && !olddyn && newdyn) | |
902 | oldweakdef = FALSE; | |
903 | ||
904 | /* NEWDYNCOMMON and OLDDYNCOMMON indicate whether the new or old | |
905 | symbol, respectively, appears to be a common symbol in a dynamic | |
906 | object. If a symbol appears in an uninitialized section, and is | |
907 | not weak, and is not a function, then it may be a common symbol | |
908 | which was resolved when the dynamic object was created. We want | |
909 | to treat such symbols specially, because they raise special | |
910 | considerations when setting the symbol size: if the symbol | |
911 | appears as a common symbol in a regular object, and the size in | |
912 | the regular object is larger, we must make sure that we use the | |
913 | larger size. This problematic case can always be avoided in C, | |
914 | but it must be handled correctly when using Fortran shared | |
915 | libraries. | |
916 | ||
917 | Note that if NEWDYNCOMMON is set, NEWDEF will be set, and | |
918 | likewise for OLDDYNCOMMON and OLDDEF. | |
919 | ||
920 | Note that this test is just a heuristic, and that it is quite | |
921 | possible to have an uninitialized symbol in a shared object which | |
922 | is really a definition, rather than a common symbol. This could | |
923 | lead to some minor confusion when the symbol really is a common | |
924 | symbol in some regular object. However, I think it will be | |
925 | harmless. */ | |
926 | ||
927 | if (newdyn | |
928 | && newdef | |
929 | && (sec->flags & SEC_ALLOC) != 0 | |
930 | && (sec->flags & SEC_LOAD) == 0 | |
931 | && sym->st_size > 0 | |
932 | && !newweakdef | |
933 | && !newweakundef | |
934 | && ELF_ST_TYPE (sym->st_info) != STT_FUNC) | |
935 | newdyncommon = TRUE; | |
936 | else | |
937 | newdyncommon = FALSE; | |
938 | ||
939 | if (olddyn | |
940 | && olddef | |
941 | && h->root.type == bfd_link_hash_defined | |
942 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
943 | && (h->root.u.def.section->flags & SEC_ALLOC) != 0 | |
944 | && (h->root.u.def.section->flags & SEC_LOAD) == 0 | |
945 | && h->size > 0 | |
946 | && h->type != STT_FUNC) | |
947 | olddyncommon = TRUE; | |
948 | else | |
949 | olddyncommon = FALSE; | |
950 | ||
951 | /* It's OK to change the type if either the existing symbol or the | |
952 | new symbol is weak unless it comes from a DT_NEEDED entry of | |
953 | a shared object, in which case, the DT_NEEDED entry may not be | |
9e4d8df3 L |
954 | required at the run time. The type change is also OK if the |
955 | old symbol is undefined and the new symbol is defined. */ | |
45d6a902 AM |
956 | |
957 | if ((! dt_needed && oldweakdef) | |
958 | || oldweakundef | |
959 | || newweakdef | |
9e4d8df3 L |
960 | || newweakundef |
961 | || (newdef | |
962 | && (h->root.type == bfd_link_hash_undefined | |
963 | || h->root.type == bfd_link_hash_undefweak))) | |
45d6a902 AM |
964 | *type_change_ok = TRUE; |
965 | ||
966 | /* It's OK to change the size if either the existing symbol or the | |
967 | new symbol is weak, or if the old symbol is undefined. */ | |
968 | ||
969 | if (*type_change_ok | |
970 | || h->root.type == bfd_link_hash_undefined) | |
971 | *size_change_ok = TRUE; | |
972 | ||
973 | /* If both the old and the new symbols look like common symbols in a | |
974 | dynamic object, set the size of the symbol to the larger of the | |
975 | two. */ | |
976 | ||
977 | if (olddyncommon | |
978 | && newdyncommon | |
979 | && sym->st_size != h->size) | |
980 | { | |
981 | /* Since we think we have two common symbols, issue a multiple | |
982 | common warning if desired. Note that we only warn if the | |
983 | size is different. If the size is the same, we simply let | |
984 | the old symbol override the new one as normally happens with | |
985 | symbols defined in dynamic objects. */ | |
986 | ||
987 | if (! ((*info->callbacks->multiple_common) | |
988 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, | |
989 | h->size, abfd, bfd_link_hash_common, sym->st_size))) | |
990 | return FALSE; | |
252b5132 | 991 | |
45d6a902 AM |
992 | if (sym->st_size > h->size) |
993 | h->size = sym->st_size; | |
252b5132 | 994 | |
45d6a902 | 995 | *size_change_ok = TRUE; |
252b5132 RH |
996 | } |
997 | ||
45d6a902 AM |
998 | /* If we are looking at a dynamic object, and we have found a |
999 | definition, we need to see if the symbol was already defined by | |
1000 | some other object. If so, we want to use the existing | |
1001 | definition, and we do not want to report a multiple symbol | |
1002 | definition error; we do this by clobbering *PSEC to be | |
1003 | bfd_und_section_ptr. | |
1004 | ||
1005 | We treat a common symbol as a definition if the symbol in the | |
1006 | shared library is a function, since common symbols always | |
1007 | represent variables; this can cause confusion in principle, but | |
1008 | any such confusion would seem to indicate an erroneous program or | |
1009 | shared library. We also permit a common symbol in a regular | |
1010 | object to override a weak symbol in a shared object. | |
1011 | ||
1012 | We prefer a non-weak definition in a shared library to a weak | |
1013 | definition in the executable unless it comes from a DT_NEEDED | |
1014 | entry of a shared object, in which case, the DT_NEEDED entry | |
1015 | may not be required at the run time. */ | |
1016 | ||
1017 | if (newdyn | |
1018 | && newdef | |
1019 | && (olddef | |
1020 | || (h->root.type == bfd_link_hash_common | |
1021 | && (newweakdef | |
1022 | || newweakundef | |
1023 | || ELF_ST_TYPE (sym->st_info) == STT_FUNC))) | |
1024 | && (!oldweakdef | |
1025 | || dt_needed | |
1026 | || newweakdef | |
1027 | || newweakundef)) | |
1028 | { | |
1029 | *override = TRUE; | |
1030 | newdef = FALSE; | |
1031 | newdyncommon = FALSE; | |
252b5132 | 1032 | |
45d6a902 AM |
1033 | *psec = sec = bfd_und_section_ptr; |
1034 | *size_change_ok = TRUE; | |
252b5132 | 1035 | |
45d6a902 AM |
1036 | /* If we get here when the old symbol is a common symbol, then |
1037 | we are explicitly letting it override a weak symbol or | |
1038 | function in a dynamic object, and we don't want to warn about | |
1039 | a type change. If the old symbol is a defined symbol, a type | |
1040 | change warning may still be appropriate. */ | |
252b5132 | 1041 | |
45d6a902 AM |
1042 | if (h->root.type == bfd_link_hash_common) |
1043 | *type_change_ok = TRUE; | |
1044 | } | |
1045 | ||
1046 | /* Handle the special case of an old common symbol merging with a | |
1047 | new symbol which looks like a common symbol in a shared object. | |
1048 | We change *PSEC and *PVALUE to make the new symbol look like a | |
1049 | common symbol, and let _bfd_generic_link_add_one_symbol will do | |
1050 | the right thing. */ | |
1051 | ||
1052 | if (newdyncommon | |
1053 | && h->root.type == bfd_link_hash_common) | |
1054 | { | |
1055 | *override = TRUE; | |
1056 | newdef = FALSE; | |
1057 | newdyncommon = FALSE; | |
1058 | *pvalue = sym->st_size; | |
1059 | *psec = sec = bfd_com_section_ptr; | |
1060 | *size_change_ok = TRUE; | |
1061 | } | |
1062 | ||
1063 | /* If the old symbol is from a dynamic object, and the new symbol is | |
1064 | a definition which is not from a dynamic object, then the new | |
1065 | symbol overrides the old symbol. Symbols from regular files | |
1066 | always take precedence over symbols from dynamic objects, even if | |
1067 | they are defined after the dynamic object in the link. | |
1068 | ||
1069 | As above, we again permit a common symbol in a regular object to | |
1070 | override a definition in a shared object if the shared object | |
1071 | symbol is a function or is weak. | |
1072 | ||
1073 | As above, we permit a non-weak definition in a shared object to | |
1074 | override a weak definition in a regular object. */ | |
1075 | ||
1076 | flip = NULL; | |
1077 | if (! newdyn | |
1078 | && (newdef | |
1079 | || (bfd_is_com_section (sec) | |
1080 | && (oldweakdef || h->type == STT_FUNC))) | |
1081 | && olddyn | |
1082 | && olddef | |
1083 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
1084 | && ((!newweakdef && !newweakundef) || oldweakdef)) | |
1085 | { | |
1086 | /* Change the hash table entry to undefined, and let | |
1087 | _bfd_generic_link_add_one_symbol do the right thing with the | |
1088 | new definition. */ | |
1089 | ||
1090 | h->root.type = bfd_link_hash_undefined; | |
1091 | h->root.u.undef.abfd = h->root.u.def.section->owner; | |
1092 | *size_change_ok = TRUE; | |
1093 | ||
1094 | olddef = FALSE; | |
1095 | olddyncommon = FALSE; | |
1096 | ||
1097 | /* We again permit a type change when a common symbol may be | |
1098 | overriding a function. */ | |
1099 | ||
1100 | if (bfd_is_com_section (sec)) | |
1101 | *type_change_ok = TRUE; | |
1102 | ||
1103 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) | |
1104 | flip = *sym_hash; | |
1105 | else | |
1106 | /* This union may have been set to be non-NULL when this symbol | |
1107 | was seen in a dynamic object. We must force the union to be | |
1108 | NULL, so that it is correct for a regular symbol. */ | |
1109 | h->verinfo.vertree = NULL; | |
1110 | } | |
1111 | ||
1112 | /* Handle the special case of a new common symbol merging with an | |
1113 | old symbol that looks like it might be a common symbol defined in | |
1114 | a shared object. Note that we have already handled the case in | |
1115 | which a new common symbol should simply override the definition | |
1116 | in the shared library. */ | |
1117 | ||
1118 | if (! newdyn | |
1119 | && bfd_is_com_section (sec) | |
1120 | && olddyncommon) | |
1121 | { | |
1122 | /* It would be best if we could set the hash table entry to a | |
1123 | common symbol, but we don't know what to use for the section | |
1124 | or the alignment. */ | |
1125 | if (! ((*info->callbacks->multiple_common) | |
1126 | (info, h->root.root.string, oldbfd, bfd_link_hash_common, | |
1127 | h->size, abfd, bfd_link_hash_common, sym->st_size))) | |
1128 | return FALSE; | |
1129 | ||
1130 | /* If the predumed common symbol in the dynamic object is | |
1131 | larger, pretend that the new symbol has its size. */ | |
1132 | ||
1133 | if (h->size > *pvalue) | |
1134 | *pvalue = h->size; | |
1135 | ||
1136 | /* FIXME: We no longer know the alignment required by the symbol | |
1137 | in the dynamic object, so we just wind up using the one from | |
1138 | the regular object. */ | |
1139 | ||
1140 | olddef = FALSE; | |
1141 | olddyncommon = FALSE; | |
1142 | ||
1143 | h->root.type = bfd_link_hash_undefined; | |
1144 | h->root.u.undef.abfd = h->root.u.def.section->owner; | |
1145 | ||
1146 | *size_change_ok = TRUE; | |
1147 | *type_change_ok = TRUE; | |
1148 | ||
1149 | if ((*sym_hash)->root.type == bfd_link_hash_indirect) | |
1150 | flip = *sym_hash; | |
1151 | else | |
1152 | h->verinfo.vertree = NULL; | |
1153 | } | |
1154 | ||
1155 | if (flip != NULL) | |
1156 | { | |
1157 | /* Handle the case where we had a versioned symbol in a dynamic | |
1158 | library and now find a definition in a normal object. In this | |
1159 | case, we make the versioned symbol point to the normal one. */ | |
9c5bfbb7 | 1160 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
45d6a902 AM |
1161 | flip->root.type = h->root.type; |
1162 | h->root.type = bfd_link_hash_indirect; | |
1163 | h->root.u.i.link = (struct bfd_link_hash_entry *) flip; | |
1164 | (*bed->elf_backend_copy_indirect_symbol) (bed, flip, h); | |
1165 | flip->root.u.undef.abfd = h->root.u.undef.abfd; | |
1166 | if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) | |
1167 | { | |
1168 | h->elf_link_hash_flags &= ~ELF_LINK_HASH_DEF_DYNAMIC; | |
1169 | flip->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC; | |
1170 | } | |
1171 | } | |
1172 | ||
1173 | /* Handle the special case of a weak definition in a regular object | |
1174 | followed by a non-weak definition in a shared object. In this | |
1175 | case, we prefer the definition in the shared object unless it | |
1176 | comes from a DT_NEEDED entry of a shared object, in which case, | |
1177 | the DT_NEEDED entry may not be required at the run time. */ | |
1178 | if (olddef | |
1179 | && ! dt_needed | |
1180 | && oldweakdef | |
1181 | && newdef | |
1182 | && newdyn | |
1183 | && !newweakdef | |
1184 | && !newweakundef) | |
1185 | { | |
1186 | /* To make this work we have to frob the flags so that the rest | |
1187 | of the code does not think we are using the regular | |
1188 | definition. */ | |
1189 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
1190 | h->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR; | |
1191 | else if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0) | |
1192 | h->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC; | |
1193 | h->elf_link_hash_flags &= ~ (ELF_LINK_HASH_DEF_REGULAR | |
1194 | | ELF_LINK_HASH_DEF_DYNAMIC); | |
1195 | ||
1196 | /* If H is the target of an indirection, we want the caller to | |
1197 | use H rather than the indirect symbol. Otherwise if we are | |
1198 | defining a new indirect symbol we will wind up attaching it | |
1199 | to the entry we are overriding. */ | |
1200 | *sym_hash = h; | |
1201 | } | |
1202 | ||
1203 | /* Handle the special case of a non-weak definition in a shared | |
1204 | object followed by a weak definition in a regular object. In | |
1205 | this case we prefer the definition in the shared object. To make | |
1206 | this work we have to tell the caller to not treat the new symbol | |
1207 | as a definition. */ | |
1208 | if (olddef | |
1209 | && olddyn | |
1210 | && !oldweakdef | |
1211 | && newdef | |
1212 | && ! newdyn | |
1213 | && (newweakdef || newweakundef)) | |
1214 | *override = TRUE; | |
1215 | ||
1216 | return TRUE; | |
1217 | } | |
1218 | ||
1219 | /* This function is called to create an indirect symbol from the | |
1220 | default for the symbol with the default version if needed. The | |
1221 | symbol is described by H, NAME, SYM, PSEC, VALUE, and OVERRIDE. We | |
1222 | set DYNSYM if the new indirect symbol is dynamic. DT_NEEDED | |
1223 | indicates if it comes from a DT_NEEDED entry of a shared object. */ | |
1224 | ||
1225 | bfd_boolean | |
268b6b39 AM |
1226 | _bfd_elf_add_default_symbol (bfd *abfd, |
1227 | struct bfd_link_info *info, | |
1228 | struct elf_link_hash_entry *h, | |
1229 | const char *name, | |
1230 | Elf_Internal_Sym *sym, | |
1231 | asection **psec, | |
1232 | bfd_vma *value, | |
1233 | bfd_boolean *dynsym, | |
1234 | bfd_boolean override, | |
1235 | bfd_boolean dt_needed) | |
45d6a902 AM |
1236 | { |
1237 | bfd_boolean type_change_ok; | |
1238 | bfd_boolean size_change_ok; | |
1239 | bfd_boolean skip; | |
1240 | char *shortname; | |
1241 | struct elf_link_hash_entry *hi; | |
1242 | struct bfd_link_hash_entry *bh; | |
9c5bfbb7 | 1243 | const struct elf_backend_data *bed; |
45d6a902 AM |
1244 | bfd_boolean collect; |
1245 | bfd_boolean dynamic; | |
1246 | char *p; | |
1247 | size_t len, shortlen; | |
1248 | asection *sec; | |
1249 | ||
1250 | /* If this symbol has a version, and it is the default version, we | |
1251 | create an indirect symbol from the default name to the fully | |
1252 | decorated name. This will cause external references which do not | |
1253 | specify a version to be bound to this version of the symbol. */ | |
1254 | p = strchr (name, ELF_VER_CHR); | |
1255 | if (p == NULL || p[1] != ELF_VER_CHR) | |
1256 | return TRUE; | |
1257 | ||
1258 | if (override) | |
1259 | { | |
1260 | /* We are overridden by an old defition. We need to check if we | |
1261 | need to create the indirect symbol from the default name. */ | |
1262 | hi = elf_link_hash_lookup (elf_hash_table (info), name, TRUE, | |
1263 | FALSE, FALSE); | |
1264 | BFD_ASSERT (hi != NULL); | |
1265 | if (hi == h) | |
1266 | return TRUE; | |
1267 | while (hi->root.type == bfd_link_hash_indirect | |
1268 | || hi->root.type == bfd_link_hash_warning) | |
1269 | { | |
1270 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; | |
1271 | if (hi == h) | |
1272 | return TRUE; | |
1273 | } | |
1274 | } | |
1275 | ||
1276 | bed = get_elf_backend_data (abfd); | |
1277 | collect = bed->collect; | |
1278 | dynamic = (abfd->flags & DYNAMIC) != 0; | |
1279 | ||
1280 | shortlen = p - name; | |
1281 | shortname = bfd_hash_allocate (&info->hash->table, shortlen + 1); | |
1282 | if (shortname == NULL) | |
1283 | return FALSE; | |
1284 | memcpy (shortname, name, shortlen); | |
1285 | shortname[shortlen] = '\0'; | |
1286 | ||
1287 | /* We are going to create a new symbol. Merge it with any existing | |
1288 | symbol with this name. For the purposes of the merge, act as | |
1289 | though we were defining the symbol we just defined, although we | |
1290 | actually going to define an indirect symbol. */ | |
1291 | type_change_ok = FALSE; | |
1292 | size_change_ok = FALSE; | |
1293 | sec = *psec; | |
1294 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value, | |
1295 | &hi, &skip, &override, &type_change_ok, | |
1296 | &size_change_ok, dt_needed)) | |
1297 | return FALSE; | |
1298 | ||
1299 | if (skip) | |
1300 | goto nondefault; | |
1301 | ||
1302 | if (! override) | |
1303 | { | |
1304 | bh = &hi->root; | |
1305 | if (! (_bfd_generic_link_add_one_symbol | |
1306 | (info, abfd, shortname, BSF_INDIRECT, bfd_ind_section_ptr, | |
268b6b39 | 1307 | 0, name, FALSE, collect, &bh))) |
45d6a902 AM |
1308 | return FALSE; |
1309 | hi = (struct elf_link_hash_entry *) bh; | |
1310 | } | |
1311 | else | |
1312 | { | |
1313 | /* In this case the symbol named SHORTNAME is overriding the | |
1314 | indirect symbol we want to add. We were planning on making | |
1315 | SHORTNAME an indirect symbol referring to NAME. SHORTNAME | |
1316 | is the name without a version. NAME is the fully versioned | |
1317 | name, and it is the default version. | |
1318 | ||
1319 | Overriding means that we already saw a definition for the | |
1320 | symbol SHORTNAME in a regular object, and it is overriding | |
1321 | the symbol defined in the dynamic object. | |
1322 | ||
1323 | When this happens, we actually want to change NAME, the | |
1324 | symbol we just added, to refer to SHORTNAME. This will cause | |
1325 | references to NAME in the shared object to become references | |
1326 | to SHORTNAME in the regular object. This is what we expect | |
1327 | when we override a function in a shared object: that the | |
1328 | references in the shared object will be mapped to the | |
1329 | definition in the regular object. */ | |
1330 | ||
1331 | while (hi->root.type == bfd_link_hash_indirect | |
1332 | || hi->root.type == bfd_link_hash_warning) | |
1333 | hi = (struct elf_link_hash_entry *) hi->root.u.i.link; | |
1334 | ||
1335 | h->root.type = bfd_link_hash_indirect; | |
1336 | h->root.u.i.link = (struct bfd_link_hash_entry *) hi; | |
1337 | if (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) | |
1338 | { | |
1339 | h->elf_link_hash_flags &=~ ELF_LINK_HASH_DEF_DYNAMIC; | |
1340 | hi->elf_link_hash_flags |= ELF_LINK_HASH_REF_DYNAMIC; | |
1341 | if (hi->elf_link_hash_flags | |
1342 | & (ELF_LINK_HASH_REF_REGULAR | |
1343 | | ELF_LINK_HASH_DEF_REGULAR)) | |
1344 | { | |
1345 | if (! _bfd_elf_link_record_dynamic_symbol (info, hi)) | |
1346 | return FALSE; | |
1347 | } | |
1348 | } | |
1349 | ||
1350 | /* Now set HI to H, so that the following code will set the | |
1351 | other fields correctly. */ | |
1352 | hi = h; | |
1353 | } | |
1354 | ||
1355 | /* If there is a duplicate definition somewhere, then HI may not | |
1356 | point to an indirect symbol. We will have reported an error to | |
1357 | the user in that case. */ | |
1358 | ||
1359 | if (hi->root.type == bfd_link_hash_indirect) | |
1360 | { | |
1361 | struct elf_link_hash_entry *ht; | |
1362 | ||
1363 | /* If the symbol became indirect, then we assume that we have | |
1364 | not seen a definition before. */ | |
1365 | BFD_ASSERT ((hi->elf_link_hash_flags | |
1366 | & (ELF_LINK_HASH_DEF_DYNAMIC | |
1367 | | ELF_LINK_HASH_DEF_REGULAR)) == 0); | |
1368 | ||
1369 | ht = (struct elf_link_hash_entry *) hi->root.u.i.link; | |
1370 | (*bed->elf_backend_copy_indirect_symbol) (bed, ht, hi); | |
1371 | ||
1372 | /* See if the new flags lead us to realize that the symbol must | |
1373 | be dynamic. */ | |
1374 | if (! *dynsym) | |
1375 | { | |
1376 | if (! dynamic) | |
1377 | { | |
1378 | if (info->shared | |
1379 | || ((hi->elf_link_hash_flags | |
1380 | & ELF_LINK_HASH_REF_DYNAMIC) != 0)) | |
1381 | *dynsym = TRUE; | |
1382 | } | |
1383 | else | |
1384 | { | |
1385 | if ((hi->elf_link_hash_flags | |
1386 | & ELF_LINK_HASH_REF_REGULAR) != 0) | |
1387 | *dynsym = TRUE; | |
1388 | } | |
1389 | } | |
1390 | } | |
1391 | ||
1392 | /* We also need to define an indirection from the nondefault version | |
1393 | of the symbol. */ | |
1394 | ||
1395 | nondefault: | |
1396 | len = strlen (name); | |
1397 | shortname = bfd_hash_allocate (&info->hash->table, len); | |
1398 | if (shortname == NULL) | |
1399 | return FALSE; | |
1400 | memcpy (shortname, name, shortlen); | |
1401 | memcpy (shortname + shortlen, p + 1, len - shortlen); | |
1402 | ||
1403 | /* Once again, merge with any existing symbol. */ | |
1404 | type_change_ok = FALSE; | |
1405 | size_change_ok = FALSE; | |
1406 | sec = *psec; | |
1407 | if (!_bfd_elf_merge_symbol (abfd, info, shortname, sym, &sec, value, | |
1408 | &hi, &skip, &override, &type_change_ok, | |
1409 | &size_change_ok, dt_needed)) | |
1410 | return FALSE; | |
1411 | ||
1412 | if (skip) | |
1413 | return TRUE; | |
1414 | ||
1415 | if (override) | |
1416 | { | |
1417 | /* Here SHORTNAME is a versioned name, so we don't expect to see | |
1418 | the type of override we do in the case above unless it is | |
1419 | overridden by a versioned definiton. */ | |
1420 | if (hi->root.type != bfd_link_hash_defined | |
1421 | && hi->root.type != bfd_link_hash_defweak) | |
1422 | (*_bfd_error_handler) | |
1423 | (_("%s: warning: unexpected redefinition of indirect versioned symbol `%s'"), | |
1424 | bfd_archive_filename (abfd), shortname); | |
1425 | } | |
1426 | else | |
1427 | { | |
1428 | bh = &hi->root; | |
1429 | if (! (_bfd_generic_link_add_one_symbol | |
1430 | (info, abfd, shortname, BSF_INDIRECT, | |
268b6b39 | 1431 | bfd_ind_section_ptr, 0, name, FALSE, collect, &bh))) |
45d6a902 AM |
1432 | return FALSE; |
1433 | hi = (struct elf_link_hash_entry *) bh; | |
1434 | ||
1435 | /* If there is a duplicate definition somewhere, then HI may not | |
1436 | point to an indirect symbol. We will have reported an error | |
1437 | to the user in that case. */ | |
1438 | ||
1439 | if (hi->root.type == bfd_link_hash_indirect) | |
1440 | { | |
1441 | /* If the symbol became indirect, then we assume that we have | |
1442 | not seen a definition before. */ | |
1443 | BFD_ASSERT ((hi->elf_link_hash_flags | |
1444 | & (ELF_LINK_HASH_DEF_DYNAMIC | |
1445 | | ELF_LINK_HASH_DEF_REGULAR)) == 0); | |
1446 | ||
1447 | (*bed->elf_backend_copy_indirect_symbol) (bed, h, hi); | |
1448 | ||
1449 | /* See if the new flags lead us to realize that the symbol | |
1450 | must be dynamic. */ | |
1451 | if (! *dynsym) | |
1452 | { | |
1453 | if (! dynamic) | |
1454 | { | |
1455 | if (info->shared | |
1456 | || ((hi->elf_link_hash_flags | |
1457 | & ELF_LINK_HASH_REF_DYNAMIC) != 0)) | |
1458 | *dynsym = TRUE; | |
1459 | } | |
1460 | else | |
1461 | { | |
1462 | if ((hi->elf_link_hash_flags | |
1463 | & ELF_LINK_HASH_REF_REGULAR) != 0) | |
1464 | *dynsym = TRUE; | |
1465 | } | |
1466 | } | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | return TRUE; | |
1471 | } | |
1472 | \f | |
1473 | /* This routine is used to export all defined symbols into the dynamic | |
1474 | symbol table. It is called via elf_link_hash_traverse. */ | |
1475 | ||
1476 | bfd_boolean | |
268b6b39 | 1477 | _bfd_elf_export_symbol (struct elf_link_hash_entry *h, void *data) |
45d6a902 | 1478 | { |
268b6b39 | 1479 | struct elf_info_failed *eif = data; |
45d6a902 AM |
1480 | |
1481 | /* Ignore indirect symbols. These are added by the versioning code. */ | |
1482 | if (h->root.type == bfd_link_hash_indirect) | |
1483 | return TRUE; | |
1484 | ||
1485 | if (h->root.type == bfd_link_hash_warning) | |
1486 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1487 | ||
1488 | if (h->dynindx == -1 | |
1489 | && (h->elf_link_hash_flags | |
1490 | & (ELF_LINK_HASH_DEF_REGULAR | ELF_LINK_HASH_REF_REGULAR)) != 0) | |
1491 | { | |
1492 | struct bfd_elf_version_tree *t; | |
1493 | struct bfd_elf_version_expr *d; | |
1494 | ||
1495 | for (t = eif->verdefs; t != NULL; t = t->next) | |
1496 | { | |
108ba305 | 1497 | if (t->globals.list != NULL) |
45d6a902 | 1498 | { |
108ba305 JJ |
1499 | d = (*t->match) (&t->globals, NULL, h->root.root.string); |
1500 | if (d != NULL) | |
1501 | goto doit; | |
45d6a902 AM |
1502 | } |
1503 | ||
108ba305 | 1504 | if (t->locals.list != NULL) |
45d6a902 | 1505 | { |
108ba305 JJ |
1506 | d = (*t->match) (&t->locals, NULL, h->root.root.string); |
1507 | if (d != NULL) | |
1508 | return TRUE; | |
45d6a902 AM |
1509 | } |
1510 | } | |
1511 | ||
1512 | if (!eif->verdefs) | |
1513 | { | |
1514 | doit: | |
1515 | if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h)) | |
1516 | { | |
1517 | eif->failed = TRUE; | |
1518 | return FALSE; | |
1519 | } | |
1520 | } | |
1521 | } | |
1522 | ||
1523 | return TRUE; | |
1524 | } | |
1525 | \f | |
1526 | /* Look through the symbols which are defined in other shared | |
1527 | libraries and referenced here. Update the list of version | |
1528 | dependencies. This will be put into the .gnu.version_r section. | |
1529 | This function is called via elf_link_hash_traverse. */ | |
1530 | ||
1531 | bfd_boolean | |
268b6b39 AM |
1532 | _bfd_elf_link_find_version_dependencies (struct elf_link_hash_entry *h, |
1533 | void *data) | |
45d6a902 | 1534 | { |
268b6b39 | 1535 | struct elf_find_verdep_info *rinfo = data; |
45d6a902 AM |
1536 | Elf_Internal_Verneed *t; |
1537 | Elf_Internal_Vernaux *a; | |
1538 | bfd_size_type amt; | |
1539 | ||
1540 | if (h->root.type == bfd_link_hash_warning) | |
1541 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1542 | ||
1543 | /* We only care about symbols defined in shared objects with version | |
1544 | information. */ | |
1545 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
1546 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
1547 | || h->dynindx == -1 | |
1548 | || h->verinfo.verdef == NULL) | |
1549 | return TRUE; | |
1550 | ||
1551 | /* See if we already know about this version. */ | |
1552 | for (t = elf_tdata (rinfo->output_bfd)->verref; t != NULL; t = t->vn_nextref) | |
1553 | { | |
1554 | if (t->vn_bfd != h->verinfo.verdef->vd_bfd) | |
1555 | continue; | |
1556 | ||
1557 | for (a = t->vn_auxptr; a != NULL; a = a->vna_nextptr) | |
1558 | if (a->vna_nodename == h->verinfo.verdef->vd_nodename) | |
1559 | return TRUE; | |
1560 | ||
1561 | break; | |
1562 | } | |
1563 | ||
1564 | /* This is a new version. Add it to tree we are building. */ | |
1565 | ||
1566 | if (t == NULL) | |
1567 | { | |
1568 | amt = sizeof *t; | |
268b6b39 | 1569 | t = bfd_zalloc (rinfo->output_bfd, amt); |
45d6a902 AM |
1570 | if (t == NULL) |
1571 | { | |
1572 | rinfo->failed = TRUE; | |
1573 | return FALSE; | |
1574 | } | |
1575 | ||
1576 | t->vn_bfd = h->verinfo.verdef->vd_bfd; | |
1577 | t->vn_nextref = elf_tdata (rinfo->output_bfd)->verref; | |
1578 | elf_tdata (rinfo->output_bfd)->verref = t; | |
1579 | } | |
1580 | ||
1581 | amt = sizeof *a; | |
268b6b39 | 1582 | a = bfd_zalloc (rinfo->output_bfd, amt); |
45d6a902 AM |
1583 | |
1584 | /* Note that we are copying a string pointer here, and testing it | |
1585 | above. If bfd_elf_string_from_elf_section is ever changed to | |
1586 | discard the string data when low in memory, this will have to be | |
1587 | fixed. */ | |
1588 | a->vna_nodename = h->verinfo.verdef->vd_nodename; | |
1589 | ||
1590 | a->vna_flags = h->verinfo.verdef->vd_flags; | |
1591 | a->vna_nextptr = t->vn_auxptr; | |
1592 | ||
1593 | h->verinfo.verdef->vd_exp_refno = rinfo->vers; | |
1594 | ++rinfo->vers; | |
1595 | ||
1596 | a->vna_other = h->verinfo.verdef->vd_exp_refno + 1; | |
1597 | ||
1598 | t->vn_auxptr = a; | |
1599 | ||
1600 | return TRUE; | |
1601 | } | |
1602 | ||
1603 | /* Figure out appropriate versions for all the symbols. We may not | |
1604 | have the version number script until we have read all of the input | |
1605 | files, so until that point we don't know which symbols should be | |
1606 | local. This function is called via elf_link_hash_traverse. */ | |
1607 | ||
1608 | bfd_boolean | |
268b6b39 | 1609 | _bfd_elf_link_assign_sym_version (struct elf_link_hash_entry *h, void *data) |
45d6a902 AM |
1610 | { |
1611 | struct elf_assign_sym_version_info *sinfo; | |
1612 | struct bfd_link_info *info; | |
9c5bfbb7 | 1613 | const struct elf_backend_data *bed; |
45d6a902 AM |
1614 | struct elf_info_failed eif; |
1615 | char *p; | |
1616 | bfd_size_type amt; | |
1617 | ||
268b6b39 | 1618 | sinfo = data; |
45d6a902 AM |
1619 | info = sinfo->info; |
1620 | ||
1621 | if (h->root.type == bfd_link_hash_warning) | |
1622 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
1623 | ||
1624 | /* Fix the symbol flags. */ | |
1625 | eif.failed = FALSE; | |
1626 | eif.info = info; | |
1627 | if (! _bfd_elf_fix_symbol_flags (h, &eif)) | |
1628 | { | |
1629 | if (eif.failed) | |
1630 | sinfo->failed = TRUE; | |
1631 | return FALSE; | |
1632 | } | |
1633 | ||
1634 | /* We only need version numbers for symbols defined in regular | |
1635 | objects. */ | |
1636 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
1637 | return TRUE; | |
1638 | ||
1639 | bed = get_elf_backend_data (sinfo->output_bfd); | |
1640 | p = strchr (h->root.root.string, ELF_VER_CHR); | |
1641 | if (p != NULL && h->verinfo.vertree == NULL) | |
1642 | { | |
1643 | struct bfd_elf_version_tree *t; | |
1644 | bfd_boolean hidden; | |
1645 | ||
1646 | hidden = TRUE; | |
1647 | ||
1648 | /* There are two consecutive ELF_VER_CHR characters if this is | |
1649 | not a hidden symbol. */ | |
1650 | ++p; | |
1651 | if (*p == ELF_VER_CHR) | |
1652 | { | |
1653 | hidden = FALSE; | |
1654 | ++p; | |
1655 | } | |
1656 | ||
1657 | /* If there is no version string, we can just return out. */ | |
1658 | if (*p == '\0') | |
1659 | { | |
1660 | if (hidden) | |
1661 | h->elf_link_hash_flags |= ELF_LINK_HIDDEN; | |
1662 | return TRUE; | |
1663 | } | |
1664 | ||
1665 | /* Look for the version. If we find it, it is no longer weak. */ | |
1666 | for (t = sinfo->verdefs; t != NULL; t = t->next) | |
1667 | { | |
1668 | if (strcmp (t->name, p) == 0) | |
1669 | { | |
1670 | size_t len; | |
1671 | char *alc; | |
1672 | struct bfd_elf_version_expr *d; | |
1673 | ||
1674 | len = p - h->root.root.string; | |
268b6b39 | 1675 | alc = bfd_malloc (len); |
45d6a902 AM |
1676 | if (alc == NULL) |
1677 | return FALSE; | |
1678 | memcpy (alc, h->root.root.string, len - 1); | |
1679 | alc[len - 1] = '\0'; | |
1680 | if (alc[len - 2] == ELF_VER_CHR) | |
1681 | alc[len - 2] = '\0'; | |
1682 | ||
1683 | h->verinfo.vertree = t; | |
1684 | t->used = TRUE; | |
1685 | d = NULL; | |
1686 | ||
108ba305 JJ |
1687 | if (t->globals.list != NULL) |
1688 | d = (*t->match) (&t->globals, NULL, alc); | |
45d6a902 AM |
1689 | |
1690 | /* See if there is anything to force this symbol to | |
1691 | local scope. */ | |
108ba305 | 1692 | if (d == NULL && t->locals.list != NULL) |
45d6a902 | 1693 | { |
108ba305 JJ |
1694 | d = (*t->match) (&t->locals, NULL, alc); |
1695 | if (d != NULL | |
1696 | && h->dynindx != -1 | |
1697 | && info->shared | |
1698 | && ! info->export_dynamic) | |
1699 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); | |
45d6a902 AM |
1700 | } |
1701 | ||
1702 | free (alc); | |
1703 | break; | |
1704 | } | |
1705 | } | |
1706 | ||
1707 | /* If we are building an application, we need to create a | |
1708 | version node for this version. */ | |
36af4a4e | 1709 | if (t == NULL && info->executable) |
45d6a902 AM |
1710 | { |
1711 | struct bfd_elf_version_tree **pp; | |
1712 | int version_index; | |
1713 | ||
1714 | /* If we aren't going to export this symbol, we don't need | |
1715 | to worry about it. */ | |
1716 | if (h->dynindx == -1) | |
1717 | return TRUE; | |
1718 | ||
1719 | amt = sizeof *t; | |
108ba305 | 1720 | t = bfd_zalloc (sinfo->output_bfd, amt); |
45d6a902 AM |
1721 | if (t == NULL) |
1722 | { | |
1723 | sinfo->failed = TRUE; | |
1724 | return FALSE; | |
1725 | } | |
1726 | ||
45d6a902 | 1727 | t->name = p; |
45d6a902 AM |
1728 | t->name_indx = (unsigned int) -1; |
1729 | t->used = TRUE; | |
1730 | ||
1731 | version_index = 1; | |
1732 | /* Don't count anonymous version tag. */ | |
1733 | if (sinfo->verdefs != NULL && sinfo->verdefs->vernum == 0) | |
1734 | version_index = 0; | |
1735 | for (pp = &sinfo->verdefs; *pp != NULL; pp = &(*pp)->next) | |
1736 | ++version_index; | |
1737 | t->vernum = version_index; | |
1738 | ||
1739 | *pp = t; | |
1740 | ||
1741 | h->verinfo.vertree = t; | |
1742 | } | |
1743 | else if (t == NULL) | |
1744 | { | |
1745 | /* We could not find the version for a symbol when | |
1746 | generating a shared archive. Return an error. */ | |
1747 | (*_bfd_error_handler) | |
1748 | (_("%s: undefined versioned symbol name %s"), | |
1749 | bfd_get_filename (sinfo->output_bfd), h->root.root.string); | |
1750 | bfd_set_error (bfd_error_bad_value); | |
1751 | sinfo->failed = TRUE; | |
1752 | return FALSE; | |
1753 | } | |
1754 | ||
1755 | if (hidden) | |
1756 | h->elf_link_hash_flags |= ELF_LINK_HIDDEN; | |
1757 | } | |
1758 | ||
1759 | /* If we don't have a version for this symbol, see if we can find | |
1760 | something. */ | |
1761 | if (h->verinfo.vertree == NULL && sinfo->verdefs != NULL) | |
1762 | { | |
1763 | struct bfd_elf_version_tree *t; | |
1764 | struct bfd_elf_version_tree *local_ver; | |
1765 | struct bfd_elf_version_expr *d; | |
1766 | ||
1767 | /* See if can find what version this symbol is in. If the | |
1768 | symbol is supposed to be local, then don't actually register | |
1769 | it. */ | |
1770 | local_ver = NULL; | |
1771 | for (t = sinfo->verdefs; t != NULL; t = t->next) | |
1772 | { | |
108ba305 | 1773 | if (t->globals.list != NULL) |
45d6a902 AM |
1774 | { |
1775 | bfd_boolean matched; | |
1776 | ||
1777 | matched = FALSE; | |
108ba305 JJ |
1778 | d = NULL; |
1779 | while ((d = (*t->match) (&t->globals, d, | |
1780 | h->root.root.string)) != NULL) | |
1781 | if (d->symver) | |
1782 | matched = TRUE; | |
1783 | else | |
1784 | { | |
1785 | /* There is a version without definition. Make | |
1786 | the symbol the default definition for this | |
1787 | version. */ | |
1788 | h->verinfo.vertree = t; | |
1789 | local_ver = NULL; | |
1790 | d->script = 1; | |
1791 | break; | |
1792 | } | |
45d6a902 AM |
1793 | if (d != NULL) |
1794 | break; | |
1795 | else if (matched) | |
1796 | /* There is no undefined version for this symbol. Hide the | |
1797 | default one. */ | |
1798 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); | |
1799 | } | |
1800 | ||
108ba305 | 1801 | if (t->locals.list != NULL) |
45d6a902 | 1802 | { |
108ba305 JJ |
1803 | d = NULL; |
1804 | while ((d = (*t->match) (&t->locals, d, | |
1805 | h->root.root.string)) != NULL) | |
45d6a902 | 1806 | { |
108ba305 | 1807 | local_ver = t; |
45d6a902 | 1808 | /* If the match is "*", keep looking for a more |
108ba305 JJ |
1809 | explicit, perhaps even global, match. |
1810 | XXX: Shouldn't this be !d->wildcard instead? */ | |
1811 | if (d->pattern[0] != '*' || d->pattern[1] != '\0') | |
1812 | break; | |
45d6a902 AM |
1813 | } |
1814 | ||
1815 | if (d != NULL) | |
1816 | break; | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | if (local_ver != NULL) | |
1821 | { | |
1822 | h->verinfo.vertree = local_ver; | |
1823 | if (h->dynindx != -1 | |
1824 | && info->shared | |
1825 | && ! info->export_dynamic) | |
1826 | { | |
1827 | (*bed->elf_backend_hide_symbol) (info, h, TRUE); | |
1828 | } | |
1829 | } | |
1830 | } | |
1831 | ||
1832 | return TRUE; | |
1833 | } | |
1834 | \f | |
45d6a902 AM |
1835 | /* Read and swap the relocs from the section indicated by SHDR. This |
1836 | may be either a REL or a RELA section. The relocations are | |
1837 | translated into RELA relocations and stored in INTERNAL_RELOCS, | |
1838 | which should have already been allocated to contain enough space. | |
1839 | The EXTERNAL_RELOCS are a buffer where the external form of the | |
1840 | relocations should be stored. | |
1841 | ||
1842 | Returns FALSE if something goes wrong. */ | |
1843 | ||
1844 | static bfd_boolean | |
268b6b39 | 1845 | elf_link_read_relocs_from_section (bfd *abfd, |
243ef1e0 | 1846 | asection *sec, |
268b6b39 AM |
1847 | Elf_Internal_Shdr *shdr, |
1848 | void *external_relocs, | |
1849 | Elf_Internal_Rela *internal_relocs) | |
45d6a902 | 1850 | { |
9c5bfbb7 | 1851 | const struct elf_backend_data *bed; |
268b6b39 | 1852 | void (*swap_in) (bfd *, const bfd_byte *, Elf_Internal_Rela *); |
45d6a902 AM |
1853 | const bfd_byte *erela; |
1854 | const bfd_byte *erelaend; | |
1855 | Elf_Internal_Rela *irela; | |
243ef1e0 L |
1856 | Elf_Internal_Shdr *symtab_hdr; |
1857 | size_t nsyms; | |
45d6a902 AM |
1858 | |
1859 | /* If there aren't any relocations, that's OK. */ | |
1860 | if (!shdr) | |
1861 | return TRUE; | |
1862 | ||
1863 | /* Position ourselves at the start of the section. */ | |
1864 | if (bfd_seek (abfd, shdr->sh_offset, SEEK_SET) != 0) | |
1865 | return FALSE; | |
1866 | ||
1867 | /* Read the relocations. */ | |
1868 | if (bfd_bread (external_relocs, shdr->sh_size, abfd) != shdr->sh_size) | |
1869 | return FALSE; | |
1870 | ||
243ef1e0 L |
1871 | symtab_hdr = &elf_tdata (abfd)->symtab_hdr; |
1872 | nsyms = symtab_hdr->sh_size / symtab_hdr->sh_entsize; | |
1873 | ||
45d6a902 AM |
1874 | bed = get_elf_backend_data (abfd); |
1875 | ||
1876 | /* Convert the external relocations to the internal format. */ | |
1877 | if (shdr->sh_entsize == bed->s->sizeof_rel) | |
1878 | swap_in = bed->s->swap_reloc_in; | |
1879 | else if (shdr->sh_entsize == bed->s->sizeof_rela) | |
1880 | swap_in = bed->s->swap_reloca_in; | |
1881 | else | |
1882 | { | |
1883 | bfd_set_error (bfd_error_wrong_format); | |
1884 | return FALSE; | |
1885 | } | |
1886 | ||
1887 | erela = external_relocs; | |
1888 | erelaend = erela + NUM_SHDR_ENTRIES (shdr) * shdr->sh_entsize; | |
1889 | irela = internal_relocs; | |
1890 | while (erela < erelaend) | |
1891 | { | |
243ef1e0 L |
1892 | bfd_vma r_symndx; |
1893 | ||
45d6a902 | 1894 | (*swap_in) (abfd, erela, irela); |
243ef1e0 L |
1895 | r_symndx = ELF32_R_SYM (irela->r_info); |
1896 | if (bed->s->arch_size == 64) | |
1897 | r_symndx >>= 24; | |
1898 | if ((size_t) r_symndx >= nsyms) | |
1899 | { | |
1900 | (*_bfd_error_handler) | |
1901 | (_("%s: bad reloc symbol index (0x%lx >= 0x%lx) for offset 0x%lx in section `%s'"), | |
1902 | bfd_archive_filename (abfd), (unsigned long) r_symndx, | |
1903 | (unsigned long) nsyms, irela->r_offset, sec->name); | |
1904 | bfd_set_error (bfd_error_bad_value); | |
1905 | return FALSE; | |
1906 | } | |
45d6a902 AM |
1907 | irela += bed->s->int_rels_per_ext_rel; |
1908 | erela += shdr->sh_entsize; | |
1909 | } | |
1910 | ||
1911 | return TRUE; | |
1912 | } | |
1913 | ||
1914 | /* Read and swap the relocs for a section O. They may have been | |
1915 | cached. If the EXTERNAL_RELOCS and INTERNAL_RELOCS arguments are | |
1916 | not NULL, they are used as buffers to read into. They are known to | |
1917 | be large enough. If the INTERNAL_RELOCS relocs argument is NULL, | |
1918 | the return value is allocated using either malloc or bfd_alloc, | |
1919 | according to the KEEP_MEMORY argument. If O has two relocation | |
1920 | sections (both REL and RELA relocations), then the REL_HDR | |
1921 | relocations will appear first in INTERNAL_RELOCS, followed by the | |
1922 | REL_HDR2 relocations. */ | |
1923 | ||
1924 | Elf_Internal_Rela * | |
268b6b39 AM |
1925 | _bfd_elf_link_read_relocs (bfd *abfd, |
1926 | asection *o, | |
1927 | void *external_relocs, | |
1928 | Elf_Internal_Rela *internal_relocs, | |
1929 | bfd_boolean keep_memory) | |
45d6a902 AM |
1930 | { |
1931 | Elf_Internal_Shdr *rel_hdr; | |
268b6b39 | 1932 | void *alloc1 = NULL; |
45d6a902 | 1933 | Elf_Internal_Rela *alloc2 = NULL; |
9c5bfbb7 | 1934 | const struct elf_backend_data *bed = get_elf_backend_data (abfd); |
45d6a902 AM |
1935 | |
1936 | if (elf_section_data (o)->relocs != NULL) | |
1937 | return elf_section_data (o)->relocs; | |
1938 | ||
1939 | if (o->reloc_count == 0) | |
1940 | return NULL; | |
1941 | ||
1942 | rel_hdr = &elf_section_data (o)->rel_hdr; | |
1943 | ||
1944 | if (internal_relocs == NULL) | |
1945 | { | |
1946 | bfd_size_type size; | |
1947 | ||
1948 | size = o->reloc_count; | |
1949 | size *= bed->s->int_rels_per_ext_rel * sizeof (Elf_Internal_Rela); | |
1950 | if (keep_memory) | |
268b6b39 | 1951 | internal_relocs = bfd_alloc (abfd, size); |
45d6a902 | 1952 | else |
268b6b39 | 1953 | internal_relocs = alloc2 = bfd_malloc (size); |
45d6a902 AM |
1954 | if (internal_relocs == NULL) |
1955 | goto error_return; | |
1956 | } | |
1957 | ||
1958 | if (external_relocs == NULL) | |
1959 | { | |
1960 | bfd_size_type size = rel_hdr->sh_size; | |
1961 | ||
1962 | if (elf_section_data (o)->rel_hdr2) | |
1963 | size += elf_section_data (o)->rel_hdr2->sh_size; | |
268b6b39 | 1964 | alloc1 = bfd_malloc (size); |
45d6a902 AM |
1965 | if (alloc1 == NULL) |
1966 | goto error_return; | |
1967 | external_relocs = alloc1; | |
1968 | } | |
1969 | ||
243ef1e0 | 1970 | if (!elf_link_read_relocs_from_section (abfd, o, rel_hdr, |
45d6a902 AM |
1971 | external_relocs, |
1972 | internal_relocs)) | |
1973 | goto error_return; | |
1974 | if (!elf_link_read_relocs_from_section | |
243ef1e0 | 1975 | (abfd, o, |
45d6a902 AM |
1976 | elf_section_data (o)->rel_hdr2, |
1977 | ((bfd_byte *) external_relocs) + rel_hdr->sh_size, | |
1978 | internal_relocs + (NUM_SHDR_ENTRIES (rel_hdr) | |
1979 | * bed->s->int_rels_per_ext_rel))) | |
1980 | goto error_return; | |
1981 | ||
1982 | /* Cache the results for next time, if we can. */ | |
1983 | if (keep_memory) | |
1984 | elf_section_data (o)->relocs = internal_relocs; | |
1985 | ||
1986 | if (alloc1 != NULL) | |
1987 | free (alloc1); | |
1988 | ||
1989 | /* Don't free alloc2, since if it was allocated we are passing it | |
1990 | back (under the name of internal_relocs). */ | |
1991 | ||
1992 | return internal_relocs; | |
1993 | ||
1994 | error_return: | |
1995 | if (alloc1 != NULL) | |
1996 | free (alloc1); | |
1997 | if (alloc2 != NULL) | |
1998 | free (alloc2); | |
1999 | return NULL; | |
2000 | } | |
2001 | ||
2002 | /* Compute the size of, and allocate space for, REL_HDR which is the | |
2003 | section header for a section containing relocations for O. */ | |
2004 | ||
2005 | bfd_boolean | |
268b6b39 AM |
2006 | _bfd_elf_link_size_reloc_section (bfd *abfd, |
2007 | Elf_Internal_Shdr *rel_hdr, | |
2008 | asection *o) | |
45d6a902 AM |
2009 | { |
2010 | bfd_size_type reloc_count; | |
2011 | bfd_size_type num_rel_hashes; | |
2012 | ||
2013 | /* Figure out how many relocations there will be. */ | |
2014 | if (rel_hdr == &elf_section_data (o)->rel_hdr) | |
2015 | reloc_count = elf_section_data (o)->rel_count; | |
2016 | else | |
2017 | reloc_count = elf_section_data (o)->rel_count2; | |
2018 | ||
2019 | num_rel_hashes = o->reloc_count; | |
2020 | if (num_rel_hashes < reloc_count) | |
2021 | num_rel_hashes = reloc_count; | |
2022 | ||
2023 | /* That allows us to calculate the size of the section. */ | |
2024 | rel_hdr->sh_size = rel_hdr->sh_entsize * reloc_count; | |
2025 | ||
2026 | /* The contents field must last into write_object_contents, so we | |
2027 | allocate it with bfd_alloc rather than malloc. Also since we | |
2028 | cannot be sure that the contents will actually be filled in, | |
2029 | we zero the allocated space. */ | |
268b6b39 | 2030 | rel_hdr->contents = bfd_zalloc (abfd, rel_hdr->sh_size); |
45d6a902 AM |
2031 | if (rel_hdr->contents == NULL && rel_hdr->sh_size != 0) |
2032 | return FALSE; | |
2033 | ||
2034 | /* We only allocate one set of hash entries, so we only do it the | |
2035 | first time we are called. */ | |
2036 | if (elf_section_data (o)->rel_hashes == NULL | |
2037 | && num_rel_hashes) | |
2038 | { | |
2039 | struct elf_link_hash_entry **p; | |
2040 | ||
268b6b39 | 2041 | p = bfd_zmalloc (num_rel_hashes * sizeof (struct elf_link_hash_entry *)); |
45d6a902 AM |
2042 | if (p == NULL) |
2043 | return FALSE; | |
2044 | ||
2045 | elf_section_data (o)->rel_hashes = p; | |
2046 | } | |
2047 | ||
2048 | return TRUE; | |
2049 | } | |
2050 | ||
2051 | /* Copy the relocations indicated by the INTERNAL_RELOCS (which | |
2052 | originated from the section given by INPUT_REL_HDR) to the | |
2053 | OUTPUT_BFD. */ | |
2054 | ||
2055 | bfd_boolean | |
268b6b39 AM |
2056 | _bfd_elf_link_output_relocs (bfd *output_bfd, |
2057 | asection *input_section, | |
2058 | Elf_Internal_Shdr *input_rel_hdr, | |
2059 | Elf_Internal_Rela *internal_relocs) | |
45d6a902 AM |
2060 | { |
2061 | Elf_Internal_Rela *irela; | |
2062 | Elf_Internal_Rela *irelaend; | |
2063 | bfd_byte *erel; | |
2064 | Elf_Internal_Shdr *output_rel_hdr; | |
2065 | asection *output_section; | |
2066 | unsigned int *rel_countp = NULL; | |
9c5bfbb7 | 2067 | const struct elf_backend_data *bed; |
268b6b39 | 2068 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
45d6a902 AM |
2069 | |
2070 | output_section = input_section->output_section; | |
2071 | output_rel_hdr = NULL; | |
2072 | ||
2073 | if (elf_section_data (output_section)->rel_hdr.sh_entsize | |
2074 | == input_rel_hdr->sh_entsize) | |
2075 | { | |
2076 | output_rel_hdr = &elf_section_data (output_section)->rel_hdr; | |
2077 | rel_countp = &elf_section_data (output_section)->rel_count; | |
2078 | } | |
2079 | else if (elf_section_data (output_section)->rel_hdr2 | |
2080 | && (elf_section_data (output_section)->rel_hdr2->sh_entsize | |
2081 | == input_rel_hdr->sh_entsize)) | |
2082 | { | |
2083 | output_rel_hdr = elf_section_data (output_section)->rel_hdr2; | |
2084 | rel_countp = &elf_section_data (output_section)->rel_count2; | |
2085 | } | |
2086 | else | |
2087 | { | |
2088 | (*_bfd_error_handler) | |
2089 | (_("%s: relocation size mismatch in %s section %s"), | |
2090 | bfd_get_filename (output_bfd), | |
2091 | bfd_archive_filename (input_section->owner), | |
2092 | input_section->name); | |
2093 | bfd_set_error (bfd_error_wrong_object_format); | |
2094 | return FALSE; | |
2095 | } | |
2096 | ||
2097 | bed = get_elf_backend_data (output_bfd); | |
2098 | if (input_rel_hdr->sh_entsize == bed->s->sizeof_rel) | |
2099 | swap_out = bed->s->swap_reloc_out; | |
2100 | else if (input_rel_hdr->sh_entsize == bed->s->sizeof_rela) | |
2101 | swap_out = bed->s->swap_reloca_out; | |
2102 | else | |
2103 | abort (); | |
2104 | ||
2105 | erel = output_rel_hdr->contents; | |
2106 | erel += *rel_countp * input_rel_hdr->sh_entsize; | |
2107 | irela = internal_relocs; | |
2108 | irelaend = irela + (NUM_SHDR_ENTRIES (input_rel_hdr) | |
2109 | * bed->s->int_rels_per_ext_rel); | |
2110 | while (irela < irelaend) | |
2111 | { | |
2112 | (*swap_out) (output_bfd, irela, erel); | |
2113 | irela += bed->s->int_rels_per_ext_rel; | |
2114 | erel += input_rel_hdr->sh_entsize; | |
2115 | } | |
2116 | ||
2117 | /* Bump the counter, so that we know where to add the next set of | |
2118 | relocations. */ | |
2119 | *rel_countp += NUM_SHDR_ENTRIES (input_rel_hdr); | |
2120 | ||
2121 | return TRUE; | |
2122 | } | |
2123 | \f | |
2124 | /* Fix up the flags for a symbol. This handles various cases which | |
2125 | can only be fixed after all the input files are seen. This is | |
2126 | currently called by both adjust_dynamic_symbol and | |
2127 | assign_sym_version, which is unnecessary but perhaps more robust in | |
2128 | the face of future changes. */ | |
2129 | ||
2130 | bfd_boolean | |
268b6b39 AM |
2131 | _bfd_elf_fix_symbol_flags (struct elf_link_hash_entry *h, |
2132 | struct elf_info_failed *eif) | |
45d6a902 AM |
2133 | { |
2134 | /* If this symbol was mentioned in a non-ELF file, try to set | |
2135 | DEF_REGULAR and REF_REGULAR correctly. This is the only way to | |
2136 | permit a non-ELF file to correctly refer to a symbol defined in | |
2137 | an ELF dynamic object. */ | |
2138 | if ((h->elf_link_hash_flags & ELF_LINK_NON_ELF) != 0) | |
2139 | { | |
2140 | while (h->root.type == bfd_link_hash_indirect) | |
2141 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2142 | ||
2143 | if (h->root.type != bfd_link_hash_defined | |
2144 | && h->root.type != bfd_link_hash_defweak) | |
2145 | h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR | |
2146 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK); | |
2147 | else | |
2148 | { | |
2149 | if (h->root.u.def.section->owner != NULL | |
2150 | && (bfd_get_flavour (h->root.u.def.section->owner) | |
2151 | == bfd_target_elf_flavour)) | |
2152 | h->elf_link_hash_flags |= (ELF_LINK_HASH_REF_REGULAR | |
2153 | | ELF_LINK_HASH_REF_REGULAR_NONWEAK); | |
2154 | else | |
2155 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
2156 | } | |
2157 | ||
2158 | if (h->dynindx == -1 | |
2159 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) != 0 | |
2160 | || (h->elf_link_hash_flags & ELF_LINK_HASH_REF_DYNAMIC) != 0)) | |
2161 | { | |
2162 | if (! _bfd_elf_link_record_dynamic_symbol (eif->info, h)) | |
2163 | { | |
2164 | eif->failed = TRUE; | |
2165 | return FALSE; | |
2166 | } | |
2167 | } | |
2168 | } | |
2169 | else | |
2170 | { | |
2171 | /* Unfortunately, ELF_LINK_NON_ELF is only correct if the symbol | |
2172 | was first seen in a non-ELF file. Fortunately, if the symbol | |
2173 | was first seen in an ELF file, we're probably OK unless the | |
2174 | symbol was defined in a non-ELF file. Catch that case here. | |
2175 | FIXME: We're still in trouble if the symbol was first seen in | |
2176 | a dynamic object, and then later in a non-ELF regular object. */ | |
2177 | if ((h->root.type == bfd_link_hash_defined | |
2178 | || h->root.type == bfd_link_hash_defweak) | |
2179 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
2180 | && (h->root.u.def.section->owner != NULL | |
2181 | ? (bfd_get_flavour (h->root.u.def.section->owner) | |
2182 | != bfd_target_elf_flavour) | |
2183 | : (bfd_is_abs_section (h->root.u.def.section) | |
2184 | && (h->elf_link_hash_flags | |
2185 | & ELF_LINK_HASH_DEF_DYNAMIC) == 0))) | |
2186 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
2187 | } | |
2188 | ||
2189 | /* If this is a final link, and the symbol was defined as a common | |
2190 | symbol in a regular object file, and there was no definition in | |
2191 | any dynamic object, then the linker will have allocated space for | |
2192 | the symbol in a common section but the ELF_LINK_HASH_DEF_REGULAR | |
2193 | flag will not have been set. */ | |
2194 | if (h->root.type == bfd_link_hash_defined | |
2195 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0 | |
2196 | && (h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) != 0 | |
2197 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2198 | && (h->root.u.def.section->owner->flags & DYNAMIC) == 0) | |
2199 | h->elf_link_hash_flags |= ELF_LINK_HASH_DEF_REGULAR; | |
2200 | ||
2201 | /* If -Bsymbolic was used (which means to bind references to global | |
2202 | symbols to the definition within the shared object), and this | |
2203 | symbol was defined in a regular object, then it actually doesn't | |
9c7a29a3 AM |
2204 | need a PLT entry. Likewise, if the symbol has non-default |
2205 | visibility. If the symbol has hidden or internal visibility, we | |
c1be741f | 2206 | will force it local. */ |
45d6a902 AM |
2207 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) != 0 |
2208 | && eif->info->shared | |
2209 | && is_elf_hash_table (eif->info) | |
2210 | && (eif->info->symbolic | |
c1be741f | 2211 | || ELF_ST_VISIBILITY (h->other) != STV_DEFAULT) |
45d6a902 AM |
2212 | && (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) |
2213 | { | |
9c5bfbb7 | 2214 | const struct elf_backend_data *bed; |
45d6a902 AM |
2215 | bfd_boolean force_local; |
2216 | ||
2217 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); | |
2218 | ||
2219 | force_local = (ELF_ST_VISIBILITY (h->other) == STV_INTERNAL | |
2220 | || ELF_ST_VISIBILITY (h->other) == STV_HIDDEN); | |
2221 | (*bed->elf_backend_hide_symbol) (eif->info, h, force_local); | |
2222 | } | |
2223 | ||
2224 | /* If a weak undefined symbol has non-default visibility, we also | |
2225 | hide it from the dynamic linker. */ | |
9c7a29a3 | 2226 | if (ELF_ST_VISIBILITY (h->other) != STV_DEFAULT |
45d6a902 AM |
2227 | && h->root.type == bfd_link_hash_undefweak) |
2228 | { | |
9c5bfbb7 | 2229 | const struct elf_backend_data *bed; |
45d6a902 AM |
2230 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); |
2231 | (*bed->elf_backend_hide_symbol) (eif->info, h, TRUE); | |
2232 | } | |
2233 | ||
2234 | /* If this is a weak defined symbol in a dynamic object, and we know | |
2235 | the real definition in the dynamic object, copy interesting flags | |
2236 | over to the real definition. */ | |
2237 | if (h->weakdef != NULL) | |
2238 | { | |
2239 | struct elf_link_hash_entry *weakdef; | |
2240 | ||
2241 | weakdef = h->weakdef; | |
2242 | if (h->root.type == bfd_link_hash_indirect) | |
2243 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2244 | ||
2245 | BFD_ASSERT (h->root.type == bfd_link_hash_defined | |
2246 | || h->root.type == bfd_link_hash_defweak); | |
2247 | BFD_ASSERT (weakdef->root.type == bfd_link_hash_defined | |
2248 | || weakdef->root.type == bfd_link_hash_defweak); | |
2249 | BFD_ASSERT (weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC); | |
2250 | ||
2251 | /* If the real definition is defined by a regular object file, | |
2252 | don't do anything special. See the longer description in | |
2253 | _bfd_elf_adjust_dynamic_symbol, below. */ | |
2254 | if ((weakdef->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0) | |
2255 | h->weakdef = NULL; | |
2256 | else | |
2257 | { | |
9c5bfbb7 | 2258 | const struct elf_backend_data *bed; |
45d6a902 AM |
2259 | |
2260 | bed = get_elf_backend_data (elf_hash_table (eif->info)->dynobj); | |
2261 | (*bed->elf_backend_copy_indirect_symbol) (bed, weakdef, h); | |
2262 | } | |
2263 | } | |
2264 | ||
2265 | return TRUE; | |
2266 | } | |
2267 | ||
2268 | /* Make the backend pick a good value for a dynamic symbol. This is | |
2269 | called via elf_link_hash_traverse, and also calls itself | |
2270 | recursively. */ | |
2271 | ||
2272 | bfd_boolean | |
268b6b39 | 2273 | _bfd_elf_adjust_dynamic_symbol (struct elf_link_hash_entry *h, void *data) |
45d6a902 | 2274 | { |
268b6b39 | 2275 | struct elf_info_failed *eif = data; |
45d6a902 | 2276 | bfd *dynobj; |
9c5bfbb7 | 2277 | const struct elf_backend_data *bed; |
45d6a902 AM |
2278 | |
2279 | if (! is_elf_hash_table (eif->info)) | |
2280 | return FALSE; | |
2281 | ||
2282 | if (h->root.type == bfd_link_hash_warning) | |
2283 | { | |
2284 | h->plt = elf_hash_table (eif->info)->init_offset; | |
2285 | h->got = elf_hash_table (eif->info)->init_offset; | |
2286 | ||
2287 | /* When warning symbols are created, they **replace** the "real" | |
2288 | entry in the hash table, thus we never get to see the real | |
2289 | symbol in a hash traversal. So look at it now. */ | |
2290 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2291 | } | |
2292 | ||
2293 | /* Ignore indirect symbols. These are added by the versioning code. */ | |
2294 | if (h->root.type == bfd_link_hash_indirect) | |
2295 | return TRUE; | |
2296 | ||
2297 | /* Fix the symbol flags. */ | |
2298 | if (! _bfd_elf_fix_symbol_flags (h, eif)) | |
2299 | return FALSE; | |
2300 | ||
2301 | /* If this symbol does not require a PLT entry, and it is not | |
2302 | defined by a dynamic object, or is not referenced by a regular | |
2303 | object, ignore it. We do have to handle a weak defined symbol, | |
2304 | even if no regular object refers to it, if we decided to add it | |
2305 | to the dynamic symbol table. FIXME: Do we normally need to worry | |
2306 | about symbols which are defined by one dynamic object and | |
2307 | referenced by another one? */ | |
2308 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0 | |
2309 | && ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) != 0 | |
2310 | || (h->elf_link_hash_flags & ELF_LINK_HASH_DEF_DYNAMIC) == 0 | |
2311 | || ((h->elf_link_hash_flags & ELF_LINK_HASH_REF_REGULAR) == 0 | |
2312 | && (h->weakdef == NULL || h->weakdef->dynindx == -1)))) | |
2313 | { | |
2314 | h->plt = elf_hash_table (eif->info)->init_offset; | |
2315 | return TRUE; | |
2316 | } | |
2317 | ||
2318 | /* If we've already adjusted this symbol, don't do it again. This | |
2319 | can happen via a recursive call. */ | |
2320 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DYNAMIC_ADJUSTED) != 0) | |
2321 | return TRUE; | |
2322 | ||
2323 | /* Don't look at this symbol again. Note that we must set this | |
2324 | after checking the above conditions, because we may look at a | |
2325 | symbol once, decide not to do anything, and then get called | |
2326 | recursively later after REF_REGULAR is set below. */ | |
2327 | h->elf_link_hash_flags |= ELF_LINK_HASH_DYNAMIC_ADJUSTED; | |
2328 | ||
2329 | /* If this is a weak definition, and we know a real definition, and | |
2330 | the real symbol is not itself defined by a regular object file, | |
2331 | then get a good value for the real definition. We handle the | |
2332 | real symbol first, for the convenience of the backend routine. | |
2333 | ||
2334 | Note that there is a confusing case here. If the real definition | |
2335 | is defined by a regular object file, we don't get the real symbol | |
2336 | from the dynamic object, but we do get the weak symbol. If the | |
2337 | processor backend uses a COPY reloc, then if some routine in the | |
2338 | dynamic object changes the real symbol, we will not see that | |
2339 | change in the corresponding weak symbol. This is the way other | |
2340 | ELF linkers work as well, and seems to be a result of the shared | |
2341 | library model. | |
2342 | ||
2343 | I will clarify this issue. Most SVR4 shared libraries define the | |
2344 | variable _timezone and define timezone as a weak synonym. The | |
2345 | tzset call changes _timezone. If you write | |
2346 | extern int timezone; | |
2347 | int _timezone = 5; | |
2348 | int main () { tzset (); printf ("%d %d\n", timezone, _timezone); } | |
2349 | you might expect that, since timezone is a synonym for _timezone, | |
2350 | the same number will print both times. However, if the processor | |
2351 | backend uses a COPY reloc, then actually timezone will be copied | |
2352 | into your process image, and, since you define _timezone | |
2353 | yourself, _timezone will not. Thus timezone and _timezone will | |
2354 | wind up at different memory locations. The tzset call will set | |
2355 | _timezone, leaving timezone unchanged. */ | |
2356 | ||
2357 | if (h->weakdef != NULL) | |
2358 | { | |
2359 | /* If we get to this point, we know there is an implicit | |
2360 | reference by a regular object file via the weak symbol H. | |
2361 | FIXME: Is this really true? What if the traversal finds | |
2362 | H->WEAKDEF before it finds H? */ | |
2363 | h->weakdef->elf_link_hash_flags |= ELF_LINK_HASH_REF_REGULAR; | |
2364 | ||
268b6b39 | 2365 | if (! _bfd_elf_adjust_dynamic_symbol (h->weakdef, eif)) |
45d6a902 AM |
2366 | return FALSE; |
2367 | } | |
2368 | ||
2369 | /* If a symbol has no type and no size and does not require a PLT | |
2370 | entry, then we are probably about to do the wrong thing here: we | |
2371 | are probably going to create a COPY reloc for an empty object. | |
2372 | This case can arise when a shared object is built with assembly | |
2373 | code, and the assembly code fails to set the symbol type. */ | |
2374 | if (h->size == 0 | |
2375 | && h->type == STT_NOTYPE | |
2376 | && (h->elf_link_hash_flags & ELF_LINK_HASH_NEEDS_PLT) == 0) | |
2377 | (*_bfd_error_handler) | |
2378 | (_("warning: type and size of dynamic symbol `%s' are not defined"), | |
2379 | h->root.root.string); | |
2380 | ||
2381 | dynobj = elf_hash_table (eif->info)->dynobj; | |
2382 | bed = get_elf_backend_data (dynobj); | |
2383 | if (! (*bed->elf_backend_adjust_dynamic_symbol) (eif->info, h)) | |
2384 | { | |
2385 | eif->failed = TRUE; | |
2386 | return FALSE; | |
2387 | } | |
2388 | ||
2389 | return TRUE; | |
2390 | } | |
2391 | ||
2392 | /* Adjust all external symbols pointing into SEC_MERGE sections | |
2393 | to reflect the object merging within the sections. */ | |
2394 | ||
2395 | bfd_boolean | |
268b6b39 | 2396 | _bfd_elf_link_sec_merge_syms (struct elf_link_hash_entry *h, void *data) |
45d6a902 AM |
2397 | { |
2398 | asection *sec; | |
2399 | ||
2400 | if (h->root.type == bfd_link_hash_warning) | |
2401 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2402 | ||
2403 | if ((h->root.type == bfd_link_hash_defined | |
2404 | || h->root.type == bfd_link_hash_defweak) | |
2405 | && ((sec = h->root.u.def.section)->flags & SEC_MERGE) | |
2406 | && sec->sec_info_type == ELF_INFO_TYPE_MERGE) | |
2407 | { | |
268b6b39 | 2408 | bfd *output_bfd = data; |
45d6a902 AM |
2409 | |
2410 | h->root.u.def.value = | |
2411 | _bfd_merged_section_offset (output_bfd, | |
2412 | &h->root.u.def.section, | |
2413 | elf_section_data (sec)->sec_info, | |
268b6b39 | 2414 | h->root.u.def.value, 0); |
45d6a902 AM |
2415 | } |
2416 | ||
2417 | return TRUE; | |
2418 | } | |
986a241f RH |
2419 | |
2420 | /* Returns false if the symbol referred to by H should be considered | |
2421 | to resolve local to the current module, and true if it should be | |
2422 | considered to bind dynamically. */ | |
2423 | ||
2424 | bfd_boolean | |
268b6b39 AM |
2425 | _bfd_elf_dynamic_symbol_p (struct elf_link_hash_entry *h, |
2426 | struct bfd_link_info *info, | |
2427 | bfd_boolean ignore_protected) | |
986a241f RH |
2428 | { |
2429 | bfd_boolean binding_stays_local_p; | |
2430 | ||
2431 | if (h == NULL) | |
2432 | return FALSE; | |
2433 | ||
2434 | while (h->root.type == bfd_link_hash_indirect | |
2435 | || h->root.type == bfd_link_hash_warning) | |
2436 | h = (struct elf_link_hash_entry *) h->root.u.i.link; | |
2437 | ||
2438 | /* If it was forced local, then clearly it's not dynamic. */ | |
2439 | if (h->dynindx == -1) | |
2440 | return FALSE; | |
2441 | if (h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) | |
2442 | return FALSE; | |
2443 | ||
2444 | /* Identify the cases where name binding rules say that a | |
2445 | visible symbol resolves locally. */ | |
2446 | binding_stays_local_p = info->executable || info->symbolic; | |
2447 | ||
2448 | switch (ELF_ST_VISIBILITY (h->other)) | |
2449 | { | |
2450 | case STV_INTERNAL: | |
2451 | case STV_HIDDEN: | |
2452 | return FALSE; | |
2453 | ||
2454 | case STV_PROTECTED: | |
2455 | /* Proper resolution for function pointer equality may require | |
2456 | that these symbols perhaps be resolved dynamically, even though | |
2457 | we should be resolving them to the current module. */ | |
2458 | if (!ignore_protected) | |
2459 | binding_stays_local_p = TRUE; | |
2460 | break; | |
2461 | ||
2462 | default: | |
986a241f RH |
2463 | break; |
2464 | } | |
2465 | ||
aa37626c L |
2466 | /* If it isn't defined locally, then clearly it's dynamic. */ |
2467 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2468 | return TRUE; | |
2469 | ||
986a241f RH |
2470 | /* Otherwise, the symbol is dynamic if binding rules don't tell |
2471 | us that it remains local. */ | |
2472 | return !binding_stays_local_p; | |
2473 | } | |
f6c52c13 AM |
2474 | |
2475 | /* Return true if the symbol referred to by H should be considered | |
2476 | to resolve local to the current module, and false otherwise. Differs | |
2477 | from (the inverse of) _bfd_elf_dynamic_symbol_p in the treatment of | |
2478 | undefined symbols and weak symbols. */ | |
2479 | ||
2480 | bfd_boolean | |
268b6b39 AM |
2481 | _bfd_elf_symbol_refs_local_p (struct elf_link_hash_entry *h, |
2482 | struct bfd_link_info *info, | |
2483 | bfd_boolean local_protected) | |
f6c52c13 AM |
2484 | { |
2485 | /* If it's a local sym, of course we resolve locally. */ | |
2486 | if (h == NULL) | |
2487 | return TRUE; | |
2488 | ||
2489 | /* If we don't have a definition in a regular file, then we can't | |
2490 | resolve locally. The sym is either undefined or dynamic. */ | |
2491 | if ((h->elf_link_hash_flags & ELF_LINK_HASH_DEF_REGULAR) == 0) | |
2492 | return FALSE; | |
2493 | ||
2494 | /* Forced local symbols resolve locally. */ | |
2495 | if ((h->elf_link_hash_flags & ELF_LINK_FORCED_LOCAL) != 0) | |
2496 | return TRUE; | |
2497 | ||
2498 | /* As do non-dynamic symbols. */ | |
2499 | if (h->dynindx == -1) | |
2500 | return TRUE; | |
2501 | ||
2502 | /* At this point, we know the symbol is defined and dynamic. In an | |
2503 | executable it must resolve locally, likewise when building symbolic | |
2504 | shared libraries. */ | |
2505 | if (info->executable || info->symbolic) | |
2506 | return TRUE; | |
2507 | ||
2508 | /* Now deal with defined dynamic symbols in shared libraries. Ones | |
2509 | with default visibility might not resolve locally. */ | |
2510 | if (ELF_ST_VISIBILITY (h->other) == STV_DEFAULT) | |
2511 | return FALSE; | |
2512 | ||
2513 | /* However, STV_HIDDEN or STV_INTERNAL ones must be local. */ | |
2514 | if (ELF_ST_VISIBILITY (h->other) != STV_PROTECTED) | |
2515 | return TRUE; | |
2516 | ||
2517 | /* Function pointer equality tests may require that STV_PROTECTED | |
2518 | symbols be treated as dynamic symbols, even when we know that the | |
2519 | dynamic linker will resolve them locally. */ | |
2520 | return local_protected; | |
2521 | } | |
e1918d23 AM |
2522 | |
2523 | /* Caches some TLS segment info, and ensures that the TLS segment vma is | |
2524 | aligned. Returns the first TLS output section. */ | |
2525 | ||
2526 | struct bfd_section * | |
2527 | _bfd_elf_tls_setup (bfd *obfd, struct bfd_link_info *info) | |
2528 | { | |
2529 | struct bfd_section *sec, *tls; | |
2530 | unsigned int align = 0; | |
2531 | ||
2532 | for (sec = obfd->sections; sec != NULL; sec = sec->next) | |
2533 | if ((sec->flags & SEC_THREAD_LOCAL) != 0) | |
2534 | break; | |
2535 | tls = sec; | |
2536 | ||
2537 | for (; sec != NULL && (sec->flags & SEC_THREAD_LOCAL) != 0; sec = sec->next) | |
2538 | if (sec->alignment_power > align) | |
2539 | align = sec->alignment_power; | |
2540 | ||
2541 | elf_hash_table (info)->tls_sec = tls; | |
2542 | ||
2543 | /* Ensure the alignment of the first section is the largest alignment, | |
2544 | so that the tls segment starts aligned. */ | |
2545 | if (tls != NULL) | |
2546 | tls->alignment_power = align; | |
2547 | ||
2548 | return tls; | |
2549 | } |