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61ba1cf9 ILT |
1 | // reloc.cc -- relocate input files for gold. |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 Free Software Foundation, Inc. |
6cb15b7f ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
61ba1cf9 ILT |
23 | #include "gold.h" |
24 | ||
cb295612 ILT |
25 | #include <algorithm> |
26 | ||
61ba1cf9 | 27 | #include "workqueue.h" |
5a6f7e2d | 28 | #include "symtab.h" |
61ba1cf9 | 29 | #include "output.h" |
a9a60db6 ILT |
30 | #include "merge.h" |
31 | #include "object.h" | |
7019cd25 | 32 | #include "target-reloc.h" |
61ba1cf9 ILT |
33 | #include "reloc.h" |
34 | ||
35 | namespace gold | |
36 | { | |
37 | ||
92e059d8 ILT |
38 | // Read_relocs methods. |
39 | ||
40 | // These tasks just read the relocation information from the file. | |
41 | // After reading it, the start another task to process the | |
42 | // information. These tasks requires access to the file. | |
43 | ||
17a1d0a9 ILT |
44 | Task_token* |
45 | Read_relocs::is_runnable() | |
92e059d8 | 46 | { |
17a1d0a9 | 47 | return this->object_->is_locked() ? this->object_->token() : NULL; |
92e059d8 ILT |
48 | } |
49 | ||
50 | // Lock the file. | |
51 | ||
17a1d0a9 ILT |
52 | void |
53 | Read_relocs::locks(Task_locker* tl) | |
92e059d8 | 54 | { |
17a1d0a9 | 55 | tl->add(this, this->object_->token()); |
92e059d8 ILT |
56 | } |
57 | ||
58 | // Read the relocations and then start a Scan_relocs_task. | |
59 | ||
60 | void | |
61 | Read_relocs::run(Workqueue* workqueue) | |
62 | { | |
63 | Read_relocs_data *rd = new Read_relocs_data; | |
64 | this->object_->read_relocs(rd); | |
6d03d481 | 65 | this->object_->set_relocs_data(rd); |
17a1d0a9 ILT |
66 | this->object_->release(); |
67 | ||
6d03d481 ST |
68 | // If garbage collection is desired, we must process the relocs |
69 | // instead of scanning the relocs as reloc processing is necessary | |
70 | // to determine unused sections. | |
71 | if (parameters->options().gc_sections()) | |
72 | { | |
73 | workqueue->queue_next(new Gc_process_relocs(this->options_, | |
74 | this->symtab_, | |
75 | this->layout_, | |
76 | this->object_, rd, | |
77 | this->symtab_lock_, | |
78 | this->blocker_)); | |
79 | } | |
80 | else | |
81 | { | |
82 | workqueue->queue_next(new Scan_relocs(this->options_, this->symtab_, | |
83 | this->layout_, this->object_, rd, | |
84 | this->symtab_lock_, | |
85 | this->blocker_)); | |
86 | } | |
92e059d8 ILT |
87 | } |
88 | ||
c7912668 ILT |
89 | // Return a debugging name for the task. |
90 | ||
91 | std::string | |
92 | Read_relocs::get_name() const | |
93 | { | |
94 | return "Read_relocs " + this->object_->name(); | |
95 | } | |
96 | ||
6d03d481 ST |
97 | // Gc_process_relocs methods. |
98 | ||
99 | // These tasks process the relocations read by Read_relocs and | |
100 | // determine which sections are referenced and which are garbage. | |
101 | // This task is done only when --gc-sections is used. | |
102 | ||
103 | Task_token* | |
104 | Gc_process_relocs::is_runnable() | |
105 | { | |
106 | if (this->object_->is_locked()) | |
107 | return this->object_->token(); | |
108 | return NULL; | |
109 | } | |
110 | ||
111 | void | |
112 | Gc_process_relocs::locks(Task_locker* tl) | |
113 | { | |
114 | tl->add(this, this->object_->token()); | |
115 | tl->add(this, this->blocker_); | |
116 | } | |
117 | ||
118 | void | |
119 | Gc_process_relocs::run(Workqueue*) | |
120 | { | |
121 | this->object_->gc_process_relocs(this->options_, this->symtab_, this->layout_, | |
122 | this->rd_); | |
123 | this->object_->release(); | |
124 | } | |
125 | ||
126 | // Return a debugging name for the task. | |
127 | ||
128 | std::string | |
129 | Gc_process_relocs::get_name() const | |
130 | { | |
131 | return "Gc_process_relocs " + this->object_->name(); | |
132 | } | |
133 | ||
92e059d8 ILT |
134 | // Scan_relocs methods. |
135 | ||
136 | // These tasks scan the relocations read by Read_relocs and mark up | |
137 | // the symbol table to indicate which relocations are required. We | |
138 | // use a lock on the symbol table to keep them from interfering with | |
139 | // each other. | |
140 | ||
17a1d0a9 ILT |
141 | Task_token* |
142 | Scan_relocs::is_runnable() | |
92e059d8 | 143 | { |
17a1d0a9 ILT |
144 | if (!this->symtab_lock_->is_writable()) |
145 | return this->symtab_lock_; | |
146 | if (this->object_->is_locked()) | |
147 | return this->object_->token(); | |
148 | return NULL; | |
92e059d8 ILT |
149 | } |
150 | ||
151 | // Return the locks we hold: one on the file, one on the symbol table | |
152 | // and one blocker. | |
153 | ||
17a1d0a9 ILT |
154 | void |
155 | Scan_relocs::locks(Task_locker* tl) | |
92e059d8 | 156 | { |
17a1d0a9 ILT |
157 | tl->add(this, this->object_->token()); |
158 | tl->add(this, this->symtab_lock_); | |
159 | tl->add(this, this->blocker_); | |
92e059d8 ILT |
160 | } |
161 | ||
162 | // Scan the relocs. | |
163 | ||
164 | void | |
165 | Scan_relocs::run(Workqueue*) | |
166 | { | |
ead1e424 ILT |
167 | this->object_->scan_relocs(this->options_, this->symtab_, this->layout_, |
168 | this->rd_); | |
17a1d0a9 | 169 | this->object_->release(); |
92e059d8 ILT |
170 | delete this->rd_; |
171 | this->rd_ = NULL; | |
172 | } | |
173 | ||
c7912668 ILT |
174 | // Return a debugging name for the task. |
175 | ||
176 | std::string | |
177 | Scan_relocs::get_name() const | |
178 | { | |
179 | return "Scan_relocs " + this->object_->name(); | |
180 | } | |
181 | ||
61ba1cf9 ILT |
182 | // Relocate_task methods. |
183 | ||
730cdc88 | 184 | // We may have to wait for the output sections to be written. |
61ba1cf9 | 185 | |
17a1d0a9 ILT |
186 | Task_token* |
187 | Relocate_task::is_runnable() | |
61ba1cf9 | 188 | { |
730cdc88 ILT |
189 | if (this->object_->relocs_must_follow_section_writes() |
190 | && this->output_sections_blocker_->is_blocked()) | |
17a1d0a9 | 191 | return this->output_sections_blocker_; |
730cdc88 | 192 | |
c7912668 | 193 | if (this->object_->is_locked()) |
17a1d0a9 | 194 | return this->object_->token(); |
c7912668 | 195 | |
17a1d0a9 | 196 | return NULL; |
61ba1cf9 ILT |
197 | } |
198 | ||
199 | // We want to lock the file while we run. We want to unblock | |
730cdc88 | 200 | // INPUT_SECTIONS_BLOCKER and FINAL_BLOCKER when we are done. |
17a1d0a9 | 201 | // INPUT_SECTIONS_BLOCKER may be NULL. |
61ba1cf9 | 202 | |
17a1d0a9 ILT |
203 | void |
204 | Relocate_task::locks(Task_locker* tl) | |
61ba1cf9 | 205 | { |
17a1d0a9 ILT |
206 | if (this->input_sections_blocker_ != NULL) |
207 | tl->add(this, this->input_sections_blocker_); | |
208 | tl->add(this, this->final_blocker_); | |
209 | tl->add(this, this->object_->token()); | |
61ba1cf9 ILT |
210 | } |
211 | ||
212 | // Run the task. | |
213 | ||
214 | void | |
215 | Relocate_task::run(Workqueue*) | |
216 | { | |
92e059d8 | 217 | this->object_->relocate(this->options_, this->symtab_, this->layout_, |
61ba1cf9 | 218 | this->of_); |
cb295612 ILT |
219 | |
220 | // This is normally the last thing we will do with an object, so | |
221 | // uncache all views. | |
222 | this->object_->clear_view_cache_marks(); | |
223 | ||
17a1d0a9 | 224 | this->object_->release(); |
61ba1cf9 ILT |
225 | } |
226 | ||
c7912668 ILT |
227 | // Return a debugging name for the task. |
228 | ||
229 | std::string | |
230 | Relocate_task::get_name() const | |
231 | { | |
232 | return "Relocate_task " + this->object_->name(); | |
233 | } | |
234 | ||
92e059d8 ILT |
235 | // Read the relocs and local symbols from the object file and store |
236 | // the information in RD. | |
237 | ||
238 | template<int size, bool big_endian> | |
239 | void | |
f6ce93d6 | 240 | Sized_relobj<size, big_endian>::do_read_relocs(Read_relocs_data* rd) |
92e059d8 ILT |
241 | { |
242 | rd->relocs.clear(); | |
243 | ||
244 | unsigned int shnum = this->shnum(); | |
245 | if (shnum == 0) | |
246 | return; | |
247 | ||
248 | rd->relocs.reserve(shnum / 2); | |
249 | ||
ef9beddf ILT |
250 | const Output_sections& out_sections(this->output_sections()); |
251 | const std::vector<Address>& out_offsets(this->section_offsets_); | |
730cdc88 | 252 | |
645f8123 | 253 | const unsigned char *pshdrs = this->get_view(this->elf_file_.shoff(), |
9eb9fa57 | 254 | shnum * This::shdr_size, |
39d0cb0e | 255 | true, true); |
92e059d8 ILT |
256 | // Skip the first, dummy, section. |
257 | const unsigned char *ps = pshdrs + This::shdr_size; | |
258 | for (unsigned int i = 1; i < shnum; ++i, ps += This::shdr_size) | |
259 | { | |
260 | typename This::Shdr shdr(ps); | |
261 | ||
262 | unsigned int sh_type = shdr.get_sh_type(); | |
263 | if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA) | |
264 | continue; | |
265 | ||
d491d34e | 266 | unsigned int shndx = this->adjust_shndx(shdr.get_sh_info()); |
92e059d8 ILT |
267 | if (shndx >= shnum) |
268 | { | |
75f2446e ILT |
269 | this->error(_("relocation section %u has bad info %u"), |
270 | i, shndx); | |
271 | continue; | |
92e059d8 ILT |
272 | } |
273 | ||
ef9beddf | 274 | Output_section* os = out_sections[shndx]; |
730cdc88 | 275 | if (os == NULL) |
92e059d8 ILT |
276 | continue; |
277 | ||
ead1e424 ILT |
278 | // We are scanning relocations in order to fill out the GOT and |
279 | // PLT sections. Relocations for sections which are not | |
280 | // allocated (typically debugging sections) should not add new | |
6a74a719 | 281 | // GOT and PLT entries. So we skip them unless this is a |
031cdbed ILT |
282 | // relocatable link or we need to emit relocations. FIXME: What |
283 | // should we do if a linker script maps a section with SHF_ALLOC | |
284 | // clear to a section with SHF_ALLOC set? | |
7019cd25 ILT |
285 | typename This::Shdr secshdr(pshdrs + shndx * This::shdr_size); |
286 | bool is_section_allocated = ((secshdr.get_sh_flags() & elfcpp::SHF_ALLOC) | |
287 | != 0); | |
288 | if (!is_section_allocated | |
8851ecca ILT |
289 | && !parameters->options().relocatable() |
290 | && !parameters->options().emit_relocs()) | |
7019cd25 | 291 | continue; |
ead1e424 | 292 | |
d491d34e | 293 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_) |
92e059d8 | 294 | { |
75f2446e ILT |
295 | this->error(_("relocation section %u uses unexpected " |
296 | "symbol table %u"), | |
d491d34e | 297 | i, this->adjust_shndx(shdr.get_sh_link())); |
75f2446e | 298 | continue; |
92e059d8 ILT |
299 | } |
300 | ||
301 | off_t sh_size = shdr.get_sh_size(); | |
302 | ||
303 | unsigned int reloc_size; | |
304 | if (sh_type == elfcpp::SHT_REL) | |
305 | reloc_size = elfcpp::Elf_sizes<size>::rel_size; | |
306 | else | |
307 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
308 | if (reloc_size != shdr.get_sh_entsize()) | |
309 | { | |
75f2446e ILT |
310 | this->error(_("unexpected entsize for reloc section %u: %lu != %u"), |
311 | i, static_cast<unsigned long>(shdr.get_sh_entsize()), | |
312 | reloc_size); | |
313 | continue; | |
92e059d8 ILT |
314 | } |
315 | ||
316 | size_t reloc_count = sh_size / reloc_size; | |
f5c3f225 | 317 | if (static_cast<off_t>(reloc_count * reloc_size) != sh_size) |
92e059d8 | 318 | { |
75f2446e ILT |
319 | this->error(_("reloc section %u size %lu uneven"), |
320 | i, static_cast<unsigned long>(sh_size)); | |
321 | continue; | |
92e059d8 ILT |
322 | } |
323 | ||
324 | rd->relocs.push_back(Section_relocs()); | |
325 | Section_relocs& sr(rd->relocs.back()); | |
326 | sr.reloc_shndx = i; | |
327 | sr.data_shndx = shndx; | |
9eb9fa57 | 328 | sr.contents = this->get_lasting_view(shdr.get_sh_offset(), sh_size, |
39d0cb0e | 329 | true, true); |
92e059d8 ILT |
330 | sr.sh_type = sh_type; |
331 | sr.reloc_count = reloc_count; | |
730cdc88 | 332 | sr.output_section = os; |
a45248e0 | 333 | sr.needs_special_offset_handling = out_offsets[shndx] == invalid_address; |
7019cd25 | 334 | sr.is_data_section_allocated = is_section_allocated; |
92e059d8 ILT |
335 | } |
336 | ||
337 | // Read the local symbols. | |
a3ad94ed | 338 | gold_assert(this->symtab_shndx_ != -1U); |
645f8123 | 339 | if (this->symtab_shndx_ == 0 || this->local_symbol_count_ == 0) |
92e059d8 ILT |
340 | rd->local_symbols = NULL; |
341 | else | |
342 | { | |
343 | typename This::Shdr symtabshdr(pshdrs | |
645f8123 | 344 | + this->symtab_shndx_ * This::shdr_size); |
a3ad94ed | 345 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
92e059d8 ILT |
346 | const int sym_size = This::sym_size; |
347 | const unsigned int loccount = this->local_symbol_count_; | |
a3ad94ed | 348 | gold_assert(loccount == symtabshdr.get_sh_info()); |
92e059d8 ILT |
349 | off_t locsize = loccount * sym_size; |
350 | rd->local_symbols = this->get_lasting_view(symtabshdr.get_sh_offset(), | |
39d0cb0e | 351 | locsize, true, true); |
92e059d8 ILT |
352 | } |
353 | } | |
354 | ||
6d03d481 ST |
355 | // Process the relocs to generate mappings from source sections to referenced |
356 | // sections. This is used during garbage colletion to determine garbage | |
357 | // sections. | |
358 | ||
359 | template<int size, bool big_endian> | |
360 | void | |
361 | Sized_relobj<size, big_endian>::do_gc_process_relocs(const General_options& options, | |
362 | Symbol_table* symtab, | |
363 | Layout* layout, | |
364 | Read_relocs_data* rd) | |
365 | { | |
366 | Sized_target<size, big_endian>* target = this->sized_target(); | |
367 | ||
368 | const unsigned char* local_symbols; | |
369 | if (rd->local_symbols == NULL) | |
370 | local_symbols = NULL; | |
371 | else | |
372 | local_symbols = rd->local_symbols->data(); | |
373 | ||
374 | for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); | |
375 | p != rd->relocs.end(); | |
376 | ++p) | |
377 | { | |
378 | if (!parameters->options().relocatable()) | |
379 | { | |
380 | // As noted above, when not generating an object file, we | |
381 | // only scan allocated sections. We may see a non-allocated | |
382 | // section here if we are emitting relocs. | |
383 | if (p->is_data_section_allocated) | |
384 | target->gc_process_relocs(options, symtab, layout, this, | |
385 | p->data_shndx, p->sh_type, | |
386 | p->contents->data(), p->reloc_count, | |
387 | p->output_section, | |
388 | p->needs_special_offset_handling, | |
389 | this->local_symbol_count_, | |
390 | local_symbols); | |
391 | } | |
392 | } | |
393 | } | |
394 | ||
395 | ||
92e059d8 ILT |
396 | // Scan the relocs and adjust the symbol table. This looks for |
397 | // relocations which require GOT/PLT/COPY relocations. | |
398 | ||
399 | template<int size, bool big_endian> | |
400 | void | |
f6ce93d6 | 401 | Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options, |
92e059d8 | 402 | Symbol_table* symtab, |
ead1e424 | 403 | Layout* layout, |
92e059d8 ILT |
404 | Read_relocs_data* rd) |
405 | { | |
406 | Sized_target<size, big_endian>* target = this->sized_target(); | |
407 | ||
408 | const unsigned char* local_symbols; | |
409 | if (rd->local_symbols == NULL) | |
410 | local_symbols = NULL; | |
411 | else | |
412 | local_symbols = rd->local_symbols->data(); | |
413 | ||
414 | for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); | |
415 | p != rd->relocs.end(); | |
416 | ++p) | |
417 | { | |
6d03d481 ST |
418 | // When garbage collection is on, unreferenced sections are not included |
419 | // in the link that would have been included normally. This is known only | |
420 | // after Read_relocs hence this check has to be done again. | |
421 | if (parameters->options().gc_sections()) | |
422 | { | |
423 | if (p->output_section == NULL) | |
424 | continue; | |
425 | } | |
8851ecca | 426 | if (!parameters->options().relocatable()) |
7019cd25 ILT |
427 | { |
428 | // As noted above, when not generating an object file, we | |
429 | // only scan allocated sections. We may see a non-allocated | |
430 | // section here if we are emitting relocs. | |
431 | if (p->is_data_section_allocated) | |
432 | target->scan_relocs(options, symtab, layout, this, p->data_shndx, | |
433 | p->sh_type, p->contents->data(), | |
434 | p->reloc_count, p->output_section, | |
435 | p->needs_special_offset_handling, | |
436 | this->local_symbol_count_, | |
437 | local_symbols); | |
8851ecca | 438 | if (parameters->options().emit_relocs()) |
7019cd25 ILT |
439 | this->emit_relocs_scan(options, symtab, layout, local_symbols, p); |
440 | } | |
6a74a719 ILT |
441 | else |
442 | { | |
443 | Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx); | |
444 | gold_assert(rr != NULL); | |
445 | rr->set_reloc_count(p->reloc_count); | |
446 | target->scan_relocatable_relocs(options, symtab, layout, this, | |
447 | p->data_shndx, p->sh_type, | |
448 | p->contents->data(), | |
449 | p->reloc_count, | |
450 | p->output_section, | |
451 | p->needs_special_offset_handling, | |
452 | this->local_symbol_count_, | |
453 | local_symbols, | |
454 | rr); | |
455 | } | |
456 | ||
92e059d8 ILT |
457 | delete p->contents; |
458 | p->contents = NULL; | |
459 | } | |
460 | ||
461 | if (rd->local_symbols != NULL) | |
462 | { | |
463 | delete rd->local_symbols; | |
464 | rd->local_symbols = NULL; | |
465 | } | |
466 | } | |
467 | ||
7019cd25 ILT |
468 | // This is a strategy class we use when scanning for --emit-relocs. |
469 | ||
470 | template<int sh_type> | |
471 | class Emit_relocs_strategy | |
472 | { | |
473 | public: | |
474 | // A local non-section symbol. | |
475 | inline Relocatable_relocs::Reloc_strategy | |
68943102 | 476 | local_non_section_strategy(unsigned int, Relobj*, unsigned int) |
7019cd25 ILT |
477 | { return Relocatable_relocs::RELOC_COPY; } |
478 | ||
479 | // A local section symbol. | |
480 | inline Relocatable_relocs::Reloc_strategy | |
481 | local_section_strategy(unsigned int, Relobj*) | |
482 | { | |
483 | if (sh_type == elfcpp::SHT_RELA) | |
484 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; | |
485 | else | |
486 | { | |
487 | // The addend is stored in the section contents. Since this | |
488 | // is not a relocatable link, we are going to apply the | |
489 | // relocation contents to the section as usual. This means | |
490 | // that we have no way to record the original addend. If the | |
491 | // original addend is not zero, there is basically no way for | |
492 | // the user to handle this correctly. Caveat emptor. | |
493 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0; | |
494 | } | |
495 | } | |
496 | ||
497 | // A global symbol. | |
498 | inline Relocatable_relocs::Reloc_strategy | |
499 | global_strategy(unsigned int, Relobj*, unsigned int) | |
500 | { return Relocatable_relocs::RELOC_COPY; } | |
501 | }; | |
502 | ||
503 | // Scan the input relocations for --emit-relocs. | |
504 | ||
505 | template<int size, bool big_endian> | |
506 | void | |
507 | Sized_relobj<size, big_endian>::emit_relocs_scan( | |
508 | const General_options& options, | |
509 | Symbol_table* symtab, | |
510 | Layout* layout, | |
511 | const unsigned char* plocal_syms, | |
512 | const Read_relocs_data::Relocs_list::iterator& p) | |
513 | { | |
514 | Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx); | |
515 | gold_assert(rr != NULL); | |
516 | rr->set_reloc_count(p->reloc_count); | |
517 | ||
518 | if (p->sh_type == elfcpp::SHT_REL) | |
519 | this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(options, symtab, layout, | |
520 | plocal_syms, p, rr); | |
521 | else | |
522 | { | |
523 | gold_assert(p->sh_type == elfcpp::SHT_RELA); | |
524 | this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(options, symtab, | |
525 | layout, plocal_syms, p, | |
526 | rr); | |
527 | } | |
528 | } | |
529 | ||
530 | // Scan the input relocation for --emit-relocs, templatized on the | |
531 | // type of the relocation section. | |
532 | ||
533 | template<int size, bool big_endian> | |
534 | template<int sh_type> | |
535 | void | |
536 | Sized_relobj<size, big_endian>::emit_relocs_scan_reltype( | |
537 | const General_options& options, | |
538 | Symbol_table* symtab, | |
539 | Layout* layout, | |
540 | const unsigned char* plocal_syms, | |
541 | const Read_relocs_data::Relocs_list::iterator& p, | |
542 | Relocatable_relocs* rr) | |
543 | { | |
544 | scan_relocatable_relocs<size, big_endian, sh_type, | |
545 | Emit_relocs_strategy<sh_type> >( | |
546 | options, | |
547 | symtab, | |
548 | layout, | |
549 | this, | |
550 | p->data_shndx, | |
551 | p->contents->data(), | |
552 | p->reloc_count, | |
553 | p->output_section, | |
554 | p->needs_special_offset_handling, | |
555 | this->local_symbol_count_, | |
556 | plocal_syms, | |
557 | rr); | |
558 | } | |
559 | ||
61ba1cf9 ILT |
560 | // Relocate the input sections and write out the local symbols. |
561 | ||
562 | template<int size, bool big_endian> | |
563 | void | |
f6ce93d6 | 564 | Sized_relobj<size, big_endian>::do_relocate(const General_options& options, |
61ba1cf9 | 565 | const Symbol_table* symtab, |
92e059d8 | 566 | const Layout* layout, |
61ba1cf9 ILT |
567 | Output_file* of) |
568 | { | |
569 | unsigned int shnum = this->shnum(); | |
570 | ||
571 | // Read the section headers. | |
645f8123 | 572 | const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(), |
9eb9fa57 | 573 | shnum * This::shdr_size, |
39d0cb0e | 574 | true, true); |
61ba1cf9 ILT |
575 | |
576 | Views views; | |
577 | views.resize(shnum); | |
578 | ||
579 | // Make two passes over the sections. The first one copies the | |
580 | // section data to the output file. The second one applies | |
581 | // relocations. | |
582 | ||
583 | this->write_sections(pshdrs, of, &views); | |
584 | ||
a9a60db6 ILT |
585 | // To speed up relocations, we set up hash tables for fast lookup of |
586 | // input offsets to output addresses. | |
587 | this->initialize_input_to_output_maps(); | |
588 | ||
61ba1cf9 ILT |
589 | // Apply relocations. |
590 | ||
92e059d8 | 591 | this->relocate_sections(options, symtab, layout, pshdrs, &views); |
61ba1cf9 | 592 | |
a9a60db6 ILT |
593 | // After we've done the relocations, we release the hash tables, |
594 | // since we no longer need them. | |
595 | this->free_input_to_output_maps(); | |
596 | ||
61ba1cf9 ILT |
597 | // Write out the accumulated views. |
598 | for (unsigned int i = 1; i < shnum; ++i) | |
599 | { | |
600 | if (views[i].view != NULL) | |
730cdc88 | 601 | { |
96803768 ILT |
602 | if (!views[i].is_postprocessing_view) |
603 | { | |
604 | if (views[i].is_input_output_view) | |
605 | of->write_input_output_view(views[i].offset, | |
606 | views[i].view_size, | |
607 | views[i].view); | |
608 | else | |
609 | of->write_output_view(views[i].offset, views[i].view_size, | |
610 | views[i].view); | |
611 | } | |
730cdc88 | 612 | } |
61ba1cf9 ILT |
613 | } |
614 | ||
615 | // Write out the local symbols. | |
d491d34e ILT |
616 | this->write_local_symbols(of, layout->sympool(), layout->dynpool(), |
617 | layout->symtab_xindex(), layout->dynsym_xindex()); | |
cb295612 ILT |
618 | |
619 | // We should no longer need the local symbol values. | |
620 | this->clear_local_symbols(); | |
61ba1cf9 ILT |
621 | } |
622 | ||
cb295612 ILT |
623 | // Sort a Read_multiple vector by file offset. |
624 | struct Read_multiple_compare | |
625 | { | |
626 | inline bool | |
627 | operator()(const File_read::Read_multiple_entry& rme1, | |
628 | const File_read::Read_multiple_entry& rme2) const | |
629 | { return rme1.file_offset < rme2.file_offset; } | |
630 | }; | |
631 | ||
61ba1cf9 ILT |
632 | // Write section data to the output file. PSHDRS points to the |
633 | // section headers. Record the views in *PVIEWS for use when | |
634 | // relocating. | |
635 | ||
636 | template<int size, bool big_endian> | |
637 | void | |
f6ce93d6 | 638 | Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs, |
61ba1cf9 | 639 | Output_file* of, |
cb295612 | 640 | Views* pviews) |
61ba1cf9 ILT |
641 | { |
642 | unsigned int shnum = this->shnum(); | |
ef9beddf ILT |
643 | const Output_sections& out_sections(this->output_sections()); |
644 | const std::vector<Address>& out_offsets(this->section_offsets_); | |
61ba1cf9 | 645 | |
cb295612 ILT |
646 | File_read::Read_multiple rm; |
647 | bool is_sorted = true; | |
648 | ||
61ba1cf9 ILT |
649 | const unsigned char* p = pshdrs + This::shdr_size; |
650 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) | |
651 | { | |
652 | View_size* pvs = &(*pviews)[i]; | |
653 | ||
654 | pvs->view = NULL; | |
655 | ||
ef9beddf | 656 | const Output_section* os = out_sections[i]; |
61ba1cf9 ILT |
657 | if (os == NULL) |
658 | continue; | |
ef9beddf | 659 | Address output_offset = out_offsets[i]; |
61ba1cf9 ILT |
660 | |
661 | typename This::Shdr shdr(p); | |
662 | ||
663 | if (shdr.get_sh_type() == elfcpp::SHT_NOBITS) | |
664 | continue; | |
665 | ||
8851ecca ILT |
666 | if ((parameters->options().relocatable() |
667 | || parameters->options().emit_relocs()) | |
6a74a719 ILT |
668 | && (shdr.get_sh_type() == elfcpp::SHT_REL |
669 | || shdr.get_sh_type() == elfcpp::SHT_RELA) | |
670 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
671 | { | |
7019cd25 ILT |
672 | // This is a reloc section in a relocatable link or when |
673 | // emitting relocs. We don't need to read the input file. | |
674 | // The size and file offset are stored in the | |
675 | // Relocatable_relocs structure. | |
6a74a719 ILT |
676 | Relocatable_relocs* rr = this->relocatable_relocs(i); |
677 | gold_assert(rr != NULL); | |
678 | Output_data* posd = rr->output_data(); | |
679 | gold_assert(posd != NULL); | |
680 | ||
681 | pvs->offset = posd->offset(); | |
682 | pvs->view_size = posd->data_size(); | |
683 | pvs->view = of->get_output_view(pvs->offset, pvs->view_size); | |
684 | pvs->address = posd->address(); | |
685 | pvs->is_input_output_view = false; | |
686 | pvs->is_postprocessing_view = false; | |
687 | ||
688 | continue; | |
689 | } | |
690 | ||
96803768 ILT |
691 | // In the normal case, this input section is simply mapped to |
692 | // the output section at offset OUTPUT_OFFSET. | |
693 | ||
eff45813 CC |
694 | // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is |
695 | // handled specially--e.g., a .eh_frame section. The relocation | |
96803768 ILT |
696 | // routines need to check for each reloc where it should be |
697 | // applied. For this case, we need an input/output view for the | |
698 | // entire contents of the section in the output file. We don't | |
699 | // want to copy the contents of the input section to the output | |
700 | // section; the output section contents were already written, | |
701 | // and we waited for them in Relocate_task::is_runnable because | |
702 | // relocs_must_follow_section_writes is set for the object. | |
703 | ||
704 | // Regardless of which of the above cases is true, we have to | |
705 | // check requires_postprocessing of the output section. If that | |
706 | // is false, then we work with views of the output file | |
707 | // directly. If it is true, then we work with a separate | |
708 | // buffer, and the output section is responsible for writing the | |
709 | // final data to the output file. | |
710 | ||
711 | off_t output_section_offset; | |
ef9beddf | 712 | Address output_section_size; |
96803768 ILT |
713 | if (!os->requires_postprocessing()) |
714 | { | |
715 | output_section_offset = os->offset(); | |
ef9beddf | 716 | output_section_size = convert_types<Address, off_t>(os->data_size()); |
96803768 ILT |
717 | } |
718 | else | |
719 | { | |
720 | output_section_offset = 0; | |
ef9beddf ILT |
721 | output_section_size = |
722 | convert_types<Address, off_t>(os->postprocessing_buffer_size()); | |
96803768 ILT |
723 | } |
724 | ||
730cdc88 | 725 | off_t view_start; |
fe8718a4 | 726 | section_size_type view_size; |
eff45813 | 727 | if (output_offset != invalid_address) |
730cdc88 | 728 | { |
96803768 | 729 | view_start = output_section_offset + output_offset; |
fe8718a4 | 730 | view_size = convert_to_section_size_type(shdr.get_sh_size()); |
730cdc88 ILT |
731 | } |
732 | else | |
733 | { | |
96803768 | 734 | view_start = output_section_offset; |
fe8718a4 | 735 | view_size = convert_to_section_size_type(output_section_size); |
730cdc88 | 736 | } |
61ba1cf9 | 737 | |
730cdc88 | 738 | if (view_size == 0) |
ead1e424 ILT |
739 | continue; |
740 | ||
eff45813 | 741 | gold_assert(output_offset == invalid_address |
ef9beddf | 742 | || output_offset + view_size <= output_section_size); |
ead1e424 | 743 | |
730cdc88 | 744 | unsigned char* view; |
96803768 ILT |
745 | if (os->requires_postprocessing()) |
746 | { | |
747 | unsigned char* buffer = os->postprocessing_buffer(); | |
748 | view = buffer + view_start; | |
eff45813 | 749 | if (output_offset != invalid_address) |
cb295612 ILT |
750 | { |
751 | off_t sh_offset = shdr.get_sh_offset(); | |
752 | if (!rm.empty() && rm.back().file_offset > sh_offset) | |
753 | is_sorted = false; | |
754 | rm.push_back(File_read::Read_multiple_entry(sh_offset, | |
755 | view_size, view)); | |
756 | } | |
96803768 | 757 | } |
730cdc88 ILT |
758 | else |
759 | { | |
eff45813 | 760 | if (output_offset == invalid_address) |
96803768 ILT |
761 | view = of->get_input_output_view(view_start, view_size); |
762 | else | |
763 | { | |
764 | view = of->get_output_view(view_start, view_size); | |
cb295612 ILT |
765 | off_t sh_offset = shdr.get_sh_offset(); |
766 | if (!rm.empty() && rm.back().file_offset > sh_offset) | |
767 | is_sorted = false; | |
768 | rm.push_back(File_read::Read_multiple_entry(sh_offset, | |
769 | view_size, view)); | |
96803768 | 770 | } |
730cdc88 | 771 | } |
92e059d8 | 772 | |
61ba1cf9 | 773 | pvs->view = view; |
730cdc88 | 774 | pvs->address = os->address(); |
eff45813 | 775 | if (output_offset != invalid_address) |
730cdc88 ILT |
776 | pvs->address += output_offset; |
777 | pvs->offset = view_start; | |
778 | pvs->view_size = view_size; | |
eff45813 | 779 | pvs->is_input_output_view = output_offset == invalid_address; |
96803768 | 780 | pvs->is_postprocessing_view = os->requires_postprocessing(); |
61ba1cf9 | 781 | } |
cb295612 ILT |
782 | |
783 | // Actually read the data. | |
784 | if (!rm.empty()) | |
785 | { | |
786 | if (!is_sorted) | |
787 | std::sort(rm.begin(), rm.end(), Read_multiple_compare()); | |
788 | this->read_multiple(rm); | |
789 | } | |
61ba1cf9 ILT |
790 | } |
791 | ||
792 | // Relocate section data. VIEWS points to the section data as views | |
793 | // in the output file. | |
794 | ||
795 | template<int size, bool big_endian> | |
796 | void | |
f6ce93d6 | 797 | Sized_relobj<size, big_endian>::relocate_sections( |
92e059d8 ILT |
798 | const General_options& options, |
799 | const Symbol_table* symtab, | |
800 | const Layout* layout, | |
801 | const unsigned char* pshdrs, | |
802 | Views* pviews) | |
61ba1cf9 ILT |
803 | { |
804 | unsigned int shnum = this->shnum(); | |
61ba1cf9 ILT |
805 | Sized_target<size, big_endian>* target = this->sized_target(); |
806 | ||
ef9beddf ILT |
807 | const Output_sections& out_sections(this->output_sections()); |
808 | const std::vector<Address>& out_offsets(this->section_offsets_); | |
730cdc88 | 809 | |
92e059d8 ILT |
810 | Relocate_info<size, big_endian> relinfo; |
811 | relinfo.options = &options; | |
812 | relinfo.symtab = symtab; | |
813 | relinfo.layout = layout; | |
814 | relinfo.object = this; | |
92e059d8 | 815 | |
61ba1cf9 ILT |
816 | const unsigned char* p = pshdrs + This::shdr_size; |
817 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) | |
818 | { | |
819 | typename This::Shdr shdr(p); | |
820 | ||
821 | unsigned int sh_type = shdr.get_sh_type(); | |
822 | if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA) | |
823 | continue; | |
824 | ||
d491d34e | 825 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); |
61ba1cf9 ILT |
826 | if (index >= this->shnum()) |
827 | { | |
75f2446e ILT |
828 | this->error(_("relocation section %u has bad info %u"), |
829 | i, index); | |
830 | continue; | |
61ba1cf9 ILT |
831 | } |
832 | ||
ef9beddf | 833 | Output_section* os = out_sections[index]; |
730cdc88 | 834 | if (os == NULL) |
61ba1cf9 ILT |
835 | { |
836 | // This relocation section is against a section which we | |
837 | // discarded. | |
838 | continue; | |
839 | } | |
ef9beddf | 840 | Address output_offset = out_offsets[index]; |
61ba1cf9 | 841 | |
a3ad94ed | 842 | gold_assert((*pviews)[index].view != NULL); |
8851ecca | 843 | if (parameters->options().relocatable()) |
6a74a719 | 844 | gold_assert((*pviews)[i].view != NULL); |
61ba1cf9 | 845 | |
d491d34e | 846 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_) |
61ba1cf9 | 847 | { |
75f2446e ILT |
848 | gold_error(_("relocation section %u uses unexpected " |
849 | "symbol table %u"), | |
d491d34e | 850 | i, this->adjust_shndx(shdr.get_sh_link())); |
75f2446e | 851 | continue; |
61ba1cf9 ILT |
852 | } |
853 | ||
854 | off_t sh_size = shdr.get_sh_size(); | |
855 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), | |
39d0cb0e | 856 | sh_size, true, false); |
61ba1cf9 ILT |
857 | |
858 | unsigned int reloc_size; | |
859 | if (sh_type == elfcpp::SHT_REL) | |
860 | reloc_size = elfcpp::Elf_sizes<size>::rel_size; | |
861 | else | |
862 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
863 | ||
864 | if (reloc_size != shdr.get_sh_entsize()) | |
865 | { | |
75f2446e ILT |
866 | gold_error(_("unexpected entsize for reloc section %u: %lu != %u"), |
867 | i, static_cast<unsigned long>(shdr.get_sh_entsize()), | |
730cdc88 | 868 | reloc_size); |
75f2446e | 869 | continue; |
61ba1cf9 ILT |
870 | } |
871 | ||
872 | size_t reloc_count = sh_size / reloc_size; | |
f5c3f225 | 873 | if (static_cast<off_t>(reloc_count * reloc_size) != sh_size) |
61ba1cf9 | 874 | { |
75f2446e ILT |
875 | gold_error(_("reloc section %u size %lu uneven"), |
876 | i, static_cast<unsigned long>(sh_size)); | |
877 | continue; | |
61ba1cf9 ILT |
878 | } |
879 | ||
eff45813 | 880 | gold_assert(output_offset != invalid_address |
96803768 ILT |
881 | || this->relocs_must_follow_section_writes()); |
882 | ||
92e059d8 ILT |
883 | relinfo.reloc_shndx = i; |
884 | relinfo.data_shndx = index; | |
8851ecca | 885 | if (!parameters->options().relocatable()) |
7019cd25 ILT |
886 | { |
887 | target->relocate_section(&relinfo, | |
888 | sh_type, | |
889 | prelocs, | |
890 | reloc_count, | |
891 | os, | |
eff45813 | 892 | output_offset == invalid_address, |
7019cd25 ILT |
893 | (*pviews)[index].view, |
894 | (*pviews)[index].address, | |
895 | (*pviews)[index].view_size); | |
8851ecca | 896 | if (parameters->options().emit_relocs()) |
7019cd25 ILT |
897 | this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count, |
898 | os, output_offset, | |
899 | (*pviews)[index].view, | |
900 | (*pviews)[index].address, | |
901 | (*pviews)[index].view_size, | |
902 | (*pviews)[i].view, | |
903 | (*pviews)[i].view_size); | |
904 | } | |
6a74a719 ILT |
905 | else |
906 | { | |
907 | Relocatable_relocs* rr = this->relocatable_relocs(i); | |
908 | target->relocate_for_relocatable(&relinfo, | |
909 | sh_type, | |
910 | prelocs, | |
911 | reloc_count, | |
912 | os, | |
913 | output_offset, | |
914 | rr, | |
915 | (*pviews)[index].view, | |
916 | (*pviews)[index].address, | |
917 | (*pviews)[index].view_size, | |
918 | (*pviews)[i].view, | |
919 | (*pviews)[i].view_size); | |
920 | } | |
61ba1cf9 ILT |
921 | } |
922 | } | |
923 | ||
7019cd25 ILT |
924 | // Emit the relocs for --emit-relocs. |
925 | ||
926 | template<int size, bool big_endian> | |
927 | void | |
928 | Sized_relobj<size, big_endian>::emit_relocs( | |
929 | const Relocate_info<size, big_endian>* relinfo, | |
930 | unsigned int i, | |
931 | unsigned int sh_type, | |
932 | const unsigned char* prelocs, | |
933 | size_t reloc_count, | |
934 | Output_section* output_section, | |
ef9beddf | 935 | typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section, |
7019cd25 ILT |
936 | unsigned char* view, |
937 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
938 | section_size_type view_size, | |
939 | unsigned char* reloc_view, | |
940 | section_size_type reloc_view_size) | |
941 | { | |
942 | if (sh_type == elfcpp::SHT_REL) | |
943 | this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs, | |
944 | reloc_count, output_section, | |
945 | offset_in_output_section, | |
946 | view, address, view_size, | |
947 | reloc_view, reloc_view_size); | |
948 | else | |
949 | { | |
950 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
951 | this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs, | |
952 | reloc_count, output_section, | |
953 | offset_in_output_section, | |
954 | view, address, view_size, | |
955 | reloc_view, reloc_view_size); | |
956 | } | |
957 | } | |
958 | ||
959 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
960 | // relocation section. | |
961 | ||
962 | template<int size, bool big_endian> | |
963 | template<int sh_type> | |
964 | void | |
965 | Sized_relobj<size, big_endian>::emit_relocs_reltype( | |
966 | const Relocate_info<size, big_endian>* relinfo, | |
967 | unsigned int i, | |
968 | const unsigned char* prelocs, | |
969 | size_t reloc_count, | |
970 | Output_section* output_section, | |
ef9beddf | 971 | typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section, |
7019cd25 ILT |
972 | unsigned char* view, |
973 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
974 | section_size_type view_size, | |
975 | unsigned char* reloc_view, | |
976 | section_size_type reloc_view_size) | |
977 | { | |
978 | const Relocatable_relocs* rr = this->relocatable_relocs(i); | |
979 | relocate_for_relocatable<size, big_endian, sh_type>( | |
980 | relinfo, | |
981 | prelocs, | |
982 | reloc_count, | |
983 | output_section, | |
984 | offset_in_output_section, | |
985 | rr, | |
986 | view, | |
987 | address, | |
988 | view_size, | |
989 | reloc_view, | |
990 | reloc_view_size); | |
991 | } | |
992 | ||
a9a60db6 ILT |
993 | // Create merge hash tables for the local symbols. These are used to |
994 | // speed up relocations. | |
995 | ||
996 | template<int size, bool big_endian> | |
997 | void | |
998 | Sized_relobj<size, big_endian>::initialize_input_to_output_maps() | |
999 | { | |
1000 | const unsigned int loccount = this->local_symbol_count_; | |
1001 | for (unsigned int i = 1; i < loccount; ++i) | |
1002 | { | |
1003 | Symbol_value<size>& lv(this->local_values_[i]); | |
1004 | lv.initialize_input_to_output_map(this); | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | // Free merge hash tables for the local symbols. | |
1009 | ||
1010 | template<int size, bool big_endian> | |
1011 | void | |
1012 | Sized_relobj<size, big_endian>::free_input_to_output_maps() | |
1013 | { | |
1014 | const unsigned int loccount = this->local_symbol_count_; | |
1015 | for (unsigned int i = 1; i < loccount; ++i) | |
1016 | { | |
1017 | Symbol_value<size>& lv(this->local_values_[i]); | |
1018 | lv.free_input_to_output_map(); | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | // Class Merged_symbol_value. | |
1023 | ||
1024 | template<int size> | |
1025 | void | |
1026 | Merged_symbol_value<size>::initialize_input_to_output_map( | |
1027 | const Relobj* object, | |
1028 | unsigned int input_shndx) | |
1029 | { | |
1030 | Object_merge_map* map = object->merge_map(); | |
1031 | map->initialize_input_to_output_map<size>(input_shndx, | |
1032 | this->output_start_address_, | |
1033 | &this->output_addresses_); | |
1034 | } | |
1035 | ||
1036 | // Get the output value corresponding to an input offset if we | |
1037 | // couldn't find it in the hash table. | |
1038 | ||
1039 | template<int size> | |
1040 | typename elfcpp::Elf_types<size>::Elf_Addr | |
1041 | Merged_symbol_value<size>::value_from_output_section( | |
1042 | const Relobj* object, | |
1043 | unsigned int input_shndx, | |
1044 | typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const | |
1045 | { | |
1046 | section_offset_type output_offset; | |
1047 | bool found = object->merge_map()->get_output_offset(NULL, input_shndx, | |
1048 | input_offset, | |
1049 | &output_offset); | |
1050 | ||
1051 | // If this assertion fails, it means that some relocation was | |
1052 | // against a portion of an input merge section which we didn't map | |
1053 | // to the output file and we didn't explicitly discard. We should | |
1054 | // always map all portions of input merge sections. | |
1055 | gold_assert(found); | |
1056 | ||
1057 | if (output_offset == -1) | |
1058 | return 0; | |
1059 | else | |
1060 | return this->output_start_address_ + output_offset; | |
1061 | } | |
1062 | ||
730cdc88 ILT |
1063 | // Track_relocs methods. |
1064 | ||
1065 | // Initialize the class to track the relocs. This gets the object, | |
1066 | // the reloc section index, and the type of the relocs. This returns | |
1067 | // false if something goes wrong. | |
1068 | ||
1069 | template<int size, bool big_endian> | |
1070 | bool | |
1071 | Track_relocs<size, big_endian>::initialize( | |
b696e6d4 | 1072 | Object* object, |
730cdc88 ILT |
1073 | unsigned int reloc_shndx, |
1074 | unsigned int reloc_type) | |
1075 | { | |
730cdc88 ILT |
1076 | // If RELOC_SHNDX is -1U, it means there is more than one reloc |
1077 | // section for the .eh_frame section. We can't handle that case. | |
1078 | if (reloc_shndx == -1U) | |
1079 | return false; | |
1080 | ||
1081 | // If RELOC_SHNDX is 0, there is no reloc section. | |
1082 | if (reloc_shndx == 0) | |
1083 | return true; | |
1084 | ||
1085 | // Get the contents of the reloc section. | |
1086 | this->prelocs_ = object->section_contents(reloc_shndx, &this->len_, false); | |
1087 | ||
1088 | if (reloc_type == elfcpp::SHT_REL) | |
1089 | this->reloc_size_ = elfcpp::Elf_sizes<size>::rel_size; | |
1090 | else if (reloc_type == elfcpp::SHT_RELA) | |
1091 | this->reloc_size_ = elfcpp::Elf_sizes<size>::rela_size; | |
1092 | else | |
1093 | gold_unreachable(); | |
1094 | ||
1095 | if (this->len_ % this->reloc_size_ != 0) | |
1096 | { | |
1097 | object->error(_("reloc section size %zu is not a multiple of " | |
1098 | "reloc size %d\n"), | |
1099 | static_cast<size_t>(this->len_), | |
1100 | this->reloc_size_); | |
1101 | return false; | |
1102 | } | |
1103 | ||
1104 | return true; | |
1105 | } | |
1106 | ||
1107 | // Return the offset of the next reloc, or -1 if there isn't one. | |
1108 | ||
1109 | template<int size, bool big_endian> | |
1110 | off_t | |
1111 | Track_relocs<size, big_endian>::next_offset() const | |
1112 | { | |
1113 | if (this->pos_ >= this->len_) | |
1114 | return -1; | |
1115 | ||
1116 | // Rel and Rela start out the same, so we can always use Rel to find | |
1117 | // the r_offset value. | |
1118 | elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_); | |
1119 | return rel.get_r_offset(); | |
1120 | } | |
1121 | ||
1122 | // Return the index of the symbol referenced by the next reloc, or -1U | |
1123 | // if there aren't any more relocs. | |
1124 | ||
1125 | template<int size, bool big_endian> | |
1126 | unsigned int | |
1127 | Track_relocs<size, big_endian>::next_symndx() const | |
1128 | { | |
1129 | if (this->pos_ >= this->len_) | |
1130 | return -1U; | |
1131 | ||
1132 | // Rel and Rela start out the same, so we can use Rel to find the | |
1133 | // symbol index. | |
1134 | elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_); | |
1135 | return elfcpp::elf_r_sym<size>(rel.get_r_info()); | |
1136 | } | |
1137 | ||
1138 | // Advance to the next reloc whose r_offset is greater than or equal | |
1139 | // to OFFSET. Return the number of relocs we skip. | |
1140 | ||
1141 | template<int size, bool big_endian> | |
1142 | int | |
1143 | Track_relocs<size, big_endian>::advance(off_t offset) | |
1144 | { | |
1145 | int ret = 0; | |
1146 | while (this->pos_ < this->len_) | |
1147 | { | |
1148 | // Rel and Rela start out the same, so we can always use Rel to | |
1149 | // find the r_offset value. | |
1150 | elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_); | |
1151 | if (static_cast<off_t>(rel.get_r_offset()) >= offset) | |
1152 | break; | |
1153 | ++ret; | |
1154 | this->pos_ += this->reloc_size_; | |
1155 | } | |
1156 | return ret; | |
1157 | } | |
1158 | ||
12c0daef | 1159 | // Instantiate the templates we need. |
61ba1cf9 | 1160 | |
193a53d9 | 1161 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
1162 | template |
1163 | void | |
f6ce93d6 | 1164 | Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1165 | #endif |
92e059d8 | 1166 | |
193a53d9 | 1167 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
1168 | template |
1169 | void | |
f6ce93d6 | 1170 | Sized_relobj<32, true>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1171 | #endif |
92e059d8 | 1172 | |
193a53d9 | 1173 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
1174 | template |
1175 | void | |
f6ce93d6 | 1176 | Sized_relobj<64, false>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1177 | #endif |
92e059d8 | 1178 | |
193a53d9 | 1179 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
1180 | template |
1181 | void | |
f6ce93d6 | 1182 | Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1183 | #endif |
92e059d8 | 1184 | |
6d03d481 ST |
1185 | #ifdef HAVE_TARGET_32_LITTLE |
1186 | template | |
1187 | void | |
1188 | Sized_relobj<32, false>::do_gc_process_relocs(const General_options& options, | |
1189 | Symbol_table* symtab, | |
1190 | Layout* layout, | |
1191 | Read_relocs_data* rd); | |
1192 | #endif | |
1193 | ||
1194 | #ifdef HAVE_TARGET_32_BIG | |
1195 | template | |
1196 | void | |
1197 | Sized_relobj<32, true>::do_gc_process_relocs(const General_options& options, | |
1198 | Symbol_table* symtab, | |
1199 | Layout* layout, | |
1200 | Read_relocs_data* rd); | |
1201 | #endif | |
1202 | ||
1203 | #ifdef HAVE_TARGET_64_LITTLE | |
1204 | template | |
1205 | void | |
1206 | Sized_relobj<64, false>::do_gc_process_relocs(const General_options& options, | |
1207 | Symbol_table* symtab, | |
1208 | Layout* layout, | |
1209 | Read_relocs_data* rd); | |
1210 | #endif | |
1211 | ||
1212 | #ifdef HAVE_TARGET_64_BIG | |
1213 | template | |
1214 | void | |
1215 | Sized_relobj<64, true>::do_gc_process_relocs(const General_options& options, | |
1216 | Symbol_table* symtab, | |
1217 | Layout* layout, | |
1218 | Read_relocs_data* rd); | |
1219 | #endif | |
1220 | ||
193a53d9 | 1221 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
1222 | template |
1223 | void | |
f6ce93d6 | 1224 | Sized_relobj<32, false>::do_scan_relocs(const General_options& options, |
92e059d8 | 1225 | Symbol_table* symtab, |
ead1e424 | 1226 | Layout* layout, |
92e059d8 | 1227 | Read_relocs_data* rd); |
193a53d9 | 1228 | #endif |
92e059d8 | 1229 | |
193a53d9 | 1230 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
1231 | template |
1232 | void | |
f6ce93d6 | 1233 | Sized_relobj<32, true>::do_scan_relocs(const General_options& options, |
92e059d8 | 1234 | Symbol_table* symtab, |
ead1e424 | 1235 | Layout* layout, |
92e059d8 | 1236 | Read_relocs_data* rd); |
193a53d9 | 1237 | #endif |
92e059d8 | 1238 | |
193a53d9 | 1239 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
1240 | template |
1241 | void | |
f6ce93d6 | 1242 | Sized_relobj<64, false>::do_scan_relocs(const General_options& options, |
92e059d8 | 1243 | Symbol_table* symtab, |
ead1e424 | 1244 | Layout* layout, |
92e059d8 | 1245 | Read_relocs_data* rd); |
193a53d9 | 1246 | #endif |
92e059d8 | 1247 | |
193a53d9 | 1248 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
1249 | template |
1250 | void | |
f6ce93d6 | 1251 | Sized_relobj<64, true>::do_scan_relocs(const General_options& options, |
92e059d8 | 1252 | Symbol_table* symtab, |
ead1e424 | 1253 | Layout* layout, |
92e059d8 | 1254 | Read_relocs_data* rd); |
193a53d9 | 1255 | #endif |
92e059d8 | 1256 | |
193a53d9 | 1257 | #ifdef HAVE_TARGET_32_LITTLE |
61ba1cf9 ILT |
1258 | template |
1259 | void | |
f6ce93d6 | 1260 | Sized_relobj<32, false>::do_relocate(const General_options& options, |
61ba1cf9 | 1261 | const Symbol_table* symtab, |
92e059d8 | 1262 | const Layout* layout, |
61ba1cf9 | 1263 | Output_file* of); |
193a53d9 | 1264 | #endif |
61ba1cf9 | 1265 | |
193a53d9 | 1266 | #ifdef HAVE_TARGET_32_BIG |
61ba1cf9 ILT |
1267 | template |
1268 | void | |
f6ce93d6 | 1269 | Sized_relobj<32, true>::do_relocate(const General_options& options, |
61ba1cf9 | 1270 | const Symbol_table* symtab, |
92e059d8 | 1271 | const Layout* layout, |
61ba1cf9 | 1272 | Output_file* of); |
193a53d9 | 1273 | #endif |
61ba1cf9 | 1274 | |
193a53d9 | 1275 | #ifdef HAVE_TARGET_64_LITTLE |
61ba1cf9 ILT |
1276 | template |
1277 | void | |
f6ce93d6 | 1278 | Sized_relobj<64, false>::do_relocate(const General_options& options, |
61ba1cf9 | 1279 | const Symbol_table* symtab, |
92e059d8 | 1280 | const Layout* layout, |
61ba1cf9 | 1281 | Output_file* of); |
193a53d9 | 1282 | #endif |
61ba1cf9 | 1283 | |
193a53d9 | 1284 | #ifdef HAVE_TARGET_64_BIG |
61ba1cf9 ILT |
1285 | template |
1286 | void | |
f6ce93d6 | 1287 | Sized_relobj<64, true>::do_relocate(const General_options& options, |
61ba1cf9 | 1288 | const Symbol_table* symtab, |
92e059d8 | 1289 | const Layout* layout, |
61ba1cf9 | 1290 | Output_file* of); |
193a53d9 | 1291 | #endif |
61ba1cf9 | 1292 | |
a9a60db6 ILT |
1293 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
1294 | template | |
1295 | class Merged_symbol_value<32>; | |
1296 | #endif | |
1297 | ||
1298 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1299 | template | |
1300 | class Merged_symbol_value<64>; | |
1301 | #endif | |
1302 | ||
1303 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
1304 | template | |
1305 | class Symbol_value<32>; | |
1306 | #endif | |
1307 | ||
1308 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1309 | template | |
1310 | class Symbol_value<64>; | |
1311 | #endif | |
1312 | ||
730cdc88 ILT |
1313 | #ifdef HAVE_TARGET_32_LITTLE |
1314 | template | |
1315 | class Track_relocs<32, false>; | |
1316 | #endif | |
1317 | ||
1318 | #ifdef HAVE_TARGET_32_BIG | |
1319 | template | |
1320 | class Track_relocs<32, true>; | |
1321 | #endif | |
1322 | ||
1323 | #ifdef HAVE_TARGET_64_LITTLE | |
1324 | template | |
1325 | class Track_relocs<64, false>; | |
1326 | #endif | |
1327 | ||
1328 | #ifdef HAVE_TARGET_64_BIG | |
1329 | template | |
1330 | class Track_relocs<64, true>; | |
1331 | #endif | |
1332 | ||
61ba1cf9 | 1333 | } // End namespace gold. |