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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 | ||
ef15dade ST |
68 | // If garbage collection or identical comdat folding is desired, we |
69 | // process the relocs first before scanning them. Scanning of relocs is | |
70 | // done only after garbage or identical sections is identified. | |
71 | if (parameters->options().gc_sections() || parameters->options().icf()) | |
72 | { | |
73 | workqueue->queue_next(new Gc_process_relocs(this->options_, | |
6d03d481 ST |
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 | { | |
029ba973 ILT |
366 | Sized_target<size, big_endian>* target = |
367 | parameters->sized_target<size, big_endian>(); | |
6d03d481 ST |
368 | |
369 | const unsigned char* local_symbols; | |
370 | if (rd->local_symbols == NULL) | |
371 | local_symbols = NULL; | |
372 | else | |
373 | local_symbols = rd->local_symbols->data(); | |
374 | ||
375 | for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); | |
376 | p != rd->relocs.end(); | |
377 | ++p) | |
378 | { | |
379 | if (!parameters->options().relocatable()) | |
380 | { | |
381 | // As noted above, when not generating an object file, we | |
382 | // only scan allocated sections. We may see a non-allocated | |
383 | // section here if we are emitting relocs. | |
384 | if (p->is_data_section_allocated) | |
385 | target->gc_process_relocs(options, symtab, layout, this, | |
386 | p->data_shndx, p->sh_type, | |
387 | p->contents->data(), p->reloc_count, | |
388 | p->output_section, | |
389 | p->needs_special_offset_handling, | |
390 | this->local_symbol_count_, | |
391 | local_symbols); | |
392 | } | |
393 | } | |
394 | } | |
395 | ||
396 | ||
92e059d8 ILT |
397 | // Scan the relocs and adjust the symbol table. This looks for |
398 | // relocations which require GOT/PLT/COPY relocations. | |
399 | ||
400 | template<int size, bool big_endian> | |
401 | void | |
f6ce93d6 | 402 | Sized_relobj<size, big_endian>::do_scan_relocs(const General_options& options, |
92e059d8 | 403 | Symbol_table* symtab, |
ead1e424 | 404 | Layout* layout, |
92e059d8 ILT |
405 | Read_relocs_data* rd) |
406 | { | |
029ba973 ILT |
407 | Sized_target<size, big_endian>* target = |
408 | parameters->sized_target<size, big_endian>(); | |
92e059d8 ILT |
409 | |
410 | const unsigned char* local_symbols; | |
411 | if (rd->local_symbols == NULL) | |
412 | local_symbols = NULL; | |
413 | else | |
414 | local_symbols = rd->local_symbols->data(); | |
415 | ||
416 | for (Read_relocs_data::Relocs_list::iterator p = rd->relocs.begin(); | |
417 | p != rd->relocs.end(); | |
418 | ++p) | |
419 | { | |
6d03d481 ST |
420 | // When garbage collection is on, unreferenced sections are not included |
421 | // in the link that would have been included normally. This is known only | |
422 | // after Read_relocs hence this check has to be done again. | |
ef15dade | 423 | if (parameters->options().gc_sections() || parameters->options().icf()) |
6d03d481 ST |
424 | { |
425 | if (p->output_section == NULL) | |
426 | continue; | |
427 | } | |
8851ecca | 428 | if (!parameters->options().relocatable()) |
7019cd25 ILT |
429 | { |
430 | // As noted above, when not generating an object file, we | |
431 | // only scan allocated sections. We may see a non-allocated | |
432 | // section here if we are emitting relocs. | |
433 | if (p->is_data_section_allocated) | |
434 | target->scan_relocs(options, symtab, layout, this, p->data_shndx, | |
435 | p->sh_type, p->contents->data(), | |
436 | p->reloc_count, p->output_section, | |
437 | p->needs_special_offset_handling, | |
438 | this->local_symbol_count_, | |
439 | local_symbols); | |
8851ecca | 440 | if (parameters->options().emit_relocs()) |
7019cd25 ILT |
441 | this->emit_relocs_scan(options, symtab, layout, local_symbols, p); |
442 | } | |
6a74a719 ILT |
443 | else |
444 | { | |
445 | Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx); | |
446 | gold_assert(rr != NULL); | |
447 | rr->set_reloc_count(p->reloc_count); | |
448 | target->scan_relocatable_relocs(options, symtab, layout, this, | |
449 | p->data_shndx, p->sh_type, | |
450 | p->contents->data(), | |
451 | p->reloc_count, | |
452 | p->output_section, | |
453 | p->needs_special_offset_handling, | |
454 | this->local_symbol_count_, | |
455 | local_symbols, | |
456 | rr); | |
457 | } | |
458 | ||
92e059d8 ILT |
459 | delete p->contents; |
460 | p->contents = NULL; | |
461 | } | |
462 | ||
463 | if (rd->local_symbols != NULL) | |
464 | { | |
465 | delete rd->local_symbols; | |
466 | rd->local_symbols = NULL; | |
467 | } | |
468 | } | |
469 | ||
7019cd25 ILT |
470 | // This is a strategy class we use when scanning for --emit-relocs. |
471 | ||
472 | template<int sh_type> | |
473 | class Emit_relocs_strategy | |
474 | { | |
475 | public: | |
476 | // A local non-section symbol. | |
477 | inline Relocatable_relocs::Reloc_strategy | |
68943102 | 478 | local_non_section_strategy(unsigned int, Relobj*, unsigned int) |
7019cd25 ILT |
479 | { return Relocatable_relocs::RELOC_COPY; } |
480 | ||
481 | // A local section symbol. | |
482 | inline Relocatable_relocs::Reloc_strategy | |
483 | local_section_strategy(unsigned int, Relobj*) | |
484 | { | |
485 | if (sh_type == elfcpp::SHT_RELA) | |
486 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_RELA; | |
487 | else | |
488 | { | |
489 | // The addend is stored in the section contents. Since this | |
490 | // is not a relocatable link, we are going to apply the | |
491 | // relocation contents to the section as usual. This means | |
492 | // that we have no way to record the original addend. If the | |
493 | // original addend is not zero, there is basically no way for | |
494 | // the user to handle this correctly. Caveat emptor. | |
495 | return Relocatable_relocs::RELOC_ADJUST_FOR_SECTION_0; | |
496 | } | |
497 | } | |
498 | ||
499 | // A global symbol. | |
500 | inline Relocatable_relocs::Reloc_strategy | |
501 | global_strategy(unsigned int, Relobj*, unsigned int) | |
502 | { return Relocatable_relocs::RELOC_COPY; } | |
503 | }; | |
504 | ||
505 | // Scan the input relocations for --emit-relocs. | |
506 | ||
507 | template<int size, bool big_endian> | |
508 | void | |
509 | Sized_relobj<size, big_endian>::emit_relocs_scan( | |
510 | const General_options& options, | |
511 | Symbol_table* symtab, | |
512 | Layout* layout, | |
513 | const unsigned char* plocal_syms, | |
514 | const Read_relocs_data::Relocs_list::iterator& p) | |
515 | { | |
516 | Relocatable_relocs* rr = this->relocatable_relocs(p->reloc_shndx); | |
517 | gold_assert(rr != NULL); | |
518 | rr->set_reloc_count(p->reloc_count); | |
519 | ||
520 | if (p->sh_type == elfcpp::SHT_REL) | |
521 | this->emit_relocs_scan_reltype<elfcpp::SHT_REL>(options, symtab, layout, | |
522 | plocal_syms, p, rr); | |
523 | else | |
524 | { | |
525 | gold_assert(p->sh_type == elfcpp::SHT_RELA); | |
526 | this->emit_relocs_scan_reltype<elfcpp::SHT_RELA>(options, symtab, | |
527 | layout, plocal_syms, p, | |
528 | rr); | |
529 | } | |
530 | } | |
531 | ||
532 | // Scan the input relocation for --emit-relocs, templatized on the | |
533 | // type of the relocation section. | |
534 | ||
535 | template<int size, bool big_endian> | |
536 | template<int sh_type> | |
537 | void | |
538 | Sized_relobj<size, big_endian>::emit_relocs_scan_reltype( | |
539 | const General_options& options, | |
540 | Symbol_table* symtab, | |
541 | Layout* layout, | |
542 | const unsigned char* plocal_syms, | |
543 | const Read_relocs_data::Relocs_list::iterator& p, | |
544 | Relocatable_relocs* rr) | |
545 | { | |
546 | scan_relocatable_relocs<size, big_endian, sh_type, | |
547 | Emit_relocs_strategy<sh_type> >( | |
548 | options, | |
549 | symtab, | |
550 | layout, | |
551 | this, | |
552 | p->data_shndx, | |
553 | p->contents->data(), | |
554 | p->reloc_count, | |
555 | p->output_section, | |
556 | p->needs_special_offset_handling, | |
557 | this->local_symbol_count_, | |
558 | plocal_syms, | |
559 | rr); | |
560 | } | |
561 | ||
61ba1cf9 ILT |
562 | // Relocate the input sections and write out the local symbols. |
563 | ||
564 | template<int size, bool big_endian> | |
565 | void | |
f6ce93d6 | 566 | Sized_relobj<size, big_endian>::do_relocate(const General_options& options, |
61ba1cf9 | 567 | const Symbol_table* symtab, |
92e059d8 | 568 | const Layout* layout, |
61ba1cf9 ILT |
569 | Output_file* of) |
570 | { | |
571 | unsigned int shnum = this->shnum(); | |
572 | ||
573 | // Read the section headers. | |
645f8123 | 574 | const unsigned char* pshdrs = this->get_view(this->elf_file_.shoff(), |
9eb9fa57 | 575 | shnum * This::shdr_size, |
39d0cb0e | 576 | true, true); |
61ba1cf9 ILT |
577 | |
578 | Views views; | |
579 | views.resize(shnum); | |
580 | ||
581 | // Make two passes over the sections. The first one copies the | |
582 | // section data to the output file. The second one applies | |
583 | // relocations. | |
584 | ||
585 | this->write_sections(pshdrs, of, &views); | |
586 | ||
a9a60db6 ILT |
587 | // To speed up relocations, we set up hash tables for fast lookup of |
588 | // input offsets to output addresses. | |
589 | this->initialize_input_to_output_maps(); | |
590 | ||
61ba1cf9 ILT |
591 | // Apply relocations. |
592 | ||
92e059d8 | 593 | this->relocate_sections(options, symtab, layout, pshdrs, &views); |
61ba1cf9 | 594 | |
a9a60db6 ILT |
595 | // After we've done the relocations, we release the hash tables, |
596 | // since we no longer need them. | |
597 | this->free_input_to_output_maps(); | |
598 | ||
61ba1cf9 ILT |
599 | // Write out the accumulated views. |
600 | for (unsigned int i = 1; i < shnum; ++i) | |
601 | { | |
602 | if (views[i].view != NULL) | |
730cdc88 | 603 | { |
96803768 ILT |
604 | if (!views[i].is_postprocessing_view) |
605 | { | |
606 | if (views[i].is_input_output_view) | |
607 | of->write_input_output_view(views[i].offset, | |
608 | views[i].view_size, | |
609 | views[i].view); | |
610 | else | |
611 | of->write_output_view(views[i].offset, views[i].view_size, | |
612 | views[i].view); | |
613 | } | |
730cdc88 | 614 | } |
61ba1cf9 ILT |
615 | } |
616 | ||
617 | // Write out the local symbols. | |
d491d34e ILT |
618 | this->write_local_symbols(of, layout->sympool(), layout->dynpool(), |
619 | layout->symtab_xindex(), layout->dynsym_xindex()); | |
cb295612 ILT |
620 | |
621 | // We should no longer need the local symbol values. | |
622 | this->clear_local_symbols(); | |
61ba1cf9 ILT |
623 | } |
624 | ||
cb295612 ILT |
625 | // Sort a Read_multiple vector by file offset. |
626 | struct Read_multiple_compare | |
627 | { | |
628 | inline bool | |
629 | operator()(const File_read::Read_multiple_entry& rme1, | |
630 | const File_read::Read_multiple_entry& rme2) const | |
631 | { return rme1.file_offset < rme2.file_offset; } | |
632 | }; | |
633 | ||
61ba1cf9 ILT |
634 | // Write section data to the output file. PSHDRS points to the |
635 | // section headers. Record the views in *PVIEWS for use when | |
636 | // relocating. | |
637 | ||
638 | template<int size, bool big_endian> | |
639 | void | |
f6ce93d6 | 640 | Sized_relobj<size, big_endian>::write_sections(const unsigned char* pshdrs, |
61ba1cf9 | 641 | Output_file* of, |
cb295612 | 642 | Views* pviews) |
61ba1cf9 ILT |
643 | { |
644 | unsigned int shnum = this->shnum(); | |
ef9beddf ILT |
645 | const Output_sections& out_sections(this->output_sections()); |
646 | const std::vector<Address>& out_offsets(this->section_offsets_); | |
61ba1cf9 | 647 | |
cb295612 ILT |
648 | File_read::Read_multiple rm; |
649 | bool is_sorted = true; | |
650 | ||
61ba1cf9 ILT |
651 | const unsigned char* p = pshdrs + This::shdr_size; |
652 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) | |
653 | { | |
654 | View_size* pvs = &(*pviews)[i]; | |
655 | ||
656 | pvs->view = NULL; | |
657 | ||
ef9beddf | 658 | const Output_section* os = out_sections[i]; |
61ba1cf9 ILT |
659 | if (os == NULL) |
660 | continue; | |
ef9beddf | 661 | Address output_offset = out_offsets[i]; |
61ba1cf9 ILT |
662 | |
663 | typename This::Shdr shdr(p); | |
664 | ||
665 | if (shdr.get_sh_type() == elfcpp::SHT_NOBITS) | |
666 | continue; | |
667 | ||
8851ecca ILT |
668 | if ((parameters->options().relocatable() |
669 | || parameters->options().emit_relocs()) | |
6a74a719 ILT |
670 | && (shdr.get_sh_type() == elfcpp::SHT_REL |
671 | || shdr.get_sh_type() == elfcpp::SHT_RELA) | |
672 | && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0) | |
673 | { | |
7019cd25 ILT |
674 | // This is a reloc section in a relocatable link or when |
675 | // emitting relocs. We don't need to read the input file. | |
676 | // The size and file offset are stored in the | |
677 | // Relocatable_relocs structure. | |
6a74a719 ILT |
678 | Relocatable_relocs* rr = this->relocatable_relocs(i); |
679 | gold_assert(rr != NULL); | |
680 | Output_data* posd = rr->output_data(); | |
681 | gold_assert(posd != NULL); | |
682 | ||
683 | pvs->offset = posd->offset(); | |
684 | pvs->view_size = posd->data_size(); | |
685 | pvs->view = of->get_output_view(pvs->offset, pvs->view_size); | |
686 | pvs->address = posd->address(); | |
687 | pvs->is_input_output_view = false; | |
688 | pvs->is_postprocessing_view = false; | |
689 | ||
690 | continue; | |
691 | } | |
692 | ||
96803768 ILT |
693 | // In the normal case, this input section is simply mapped to |
694 | // the output section at offset OUTPUT_OFFSET. | |
695 | ||
eff45813 CC |
696 | // However, if OUTPUT_OFFSET == INVALID_ADDRESS, then input data is |
697 | // handled specially--e.g., a .eh_frame section. The relocation | |
96803768 ILT |
698 | // routines need to check for each reloc where it should be |
699 | // applied. For this case, we need an input/output view for the | |
700 | // entire contents of the section in the output file. We don't | |
701 | // want to copy the contents of the input section to the output | |
702 | // section; the output section contents were already written, | |
703 | // and we waited for them in Relocate_task::is_runnable because | |
704 | // relocs_must_follow_section_writes is set for the object. | |
705 | ||
706 | // Regardless of which of the above cases is true, we have to | |
707 | // check requires_postprocessing of the output section. If that | |
708 | // is false, then we work with views of the output file | |
709 | // directly. If it is true, then we work with a separate | |
710 | // buffer, and the output section is responsible for writing the | |
711 | // final data to the output file. | |
712 | ||
713 | off_t output_section_offset; | |
ef9beddf | 714 | Address output_section_size; |
96803768 ILT |
715 | if (!os->requires_postprocessing()) |
716 | { | |
717 | output_section_offset = os->offset(); | |
ef9beddf | 718 | output_section_size = convert_types<Address, off_t>(os->data_size()); |
96803768 ILT |
719 | } |
720 | else | |
721 | { | |
722 | output_section_offset = 0; | |
ef9beddf ILT |
723 | output_section_size = |
724 | convert_types<Address, off_t>(os->postprocessing_buffer_size()); | |
96803768 ILT |
725 | } |
726 | ||
730cdc88 | 727 | off_t view_start; |
fe8718a4 | 728 | section_size_type view_size; |
eff45813 | 729 | if (output_offset != invalid_address) |
730cdc88 | 730 | { |
96803768 | 731 | view_start = output_section_offset + output_offset; |
fe8718a4 | 732 | view_size = convert_to_section_size_type(shdr.get_sh_size()); |
730cdc88 ILT |
733 | } |
734 | else | |
735 | { | |
96803768 | 736 | view_start = output_section_offset; |
fe8718a4 | 737 | view_size = convert_to_section_size_type(output_section_size); |
730cdc88 | 738 | } |
61ba1cf9 | 739 | |
730cdc88 | 740 | if (view_size == 0) |
ead1e424 ILT |
741 | continue; |
742 | ||
eff45813 | 743 | gold_assert(output_offset == invalid_address |
ef9beddf | 744 | || output_offset + view_size <= output_section_size); |
ead1e424 | 745 | |
730cdc88 | 746 | unsigned char* view; |
96803768 ILT |
747 | if (os->requires_postprocessing()) |
748 | { | |
749 | unsigned char* buffer = os->postprocessing_buffer(); | |
750 | view = buffer + view_start; | |
eff45813 | 751 | if (output_offset != invalid_address) |
cb295612 ILT |
752 | { |
753 | off_t sh_offset = shdr.get_sh_offset(); | |
754 | if (!rm.empty() && rm.back().file_offset > sh_offset) | |
755 | is_sorted = false; | |
756 | rm.push_back(File_read::Read_multiple_entry(sh_offset, | |
757 | view_size, view)); | |
758 | } | |
96803768 | 759 | } |
730cdc88 ILT |
760 | else |
761 | { | |
eff45813 | 762 | if (output_offset == invalid_address) |
96803768 ILT |
763 | view = of->get_input_output_view(view_start, view_size); |
764 | else | |
765 | { | |
766 | view = of->get_output_view(view_start, view_size); | |
cb295612 ILT |
767 | off_t sh_offset = shdr.get_sh_offset(); |
768 | if (!rm.empty() && rm.back().file_offset > sh_offset) | |
769 | is_sorted = false; | |
770 | rm.push_back(File_read::Read_multiple_entry(sh_offset, | |
771 | view_size, view)); | |
96803768 | 772 | } |
730cdc88 | 773 | } |
92e059d8 | 774 | |
61ba1cf9 | 775 | pvs->view = view; |
730cdc88 | 776 | pvs->address = os->address(); |
eff45813 | 777 | if (output_offset != invalid_address) |
730cdc88 ILT |
778 | pvs->address += output_offset; |
779 | pvs->offset = view_start; | |
780 | pvs->view_size = view_size; | |
eff45813 | 781 | pvs->is_input_output_view = output_offset == invalid_address; |
96803768 | 782 | pvs->is_postprocessing_view = os->requires_postprocessing(); |
61ba1cf9 | 783 | } |
cb295612 ILT |
784 | |
785 | // Actually read the data. | |
786 | if (!rm.empty()) | |
787 | { | |
788 | if (!is_sorted) | |
789 | std::sort(rm.begin(), rm.end(), Read_multiple_compare()); | |
790 | this->read_multiple(rm); | |
791 | } | |
61ba1cf9 ILT |
792 | } |
793 | ||
794 | // Relocate section data. VIEWS points to the section data as views | |
795 | // in the output file. | |
796 | ||
797 | template<int size, bool big_endian> | |
798 | void | |
f6ce93d6 | 799 | Sized_relobj<size, big_endian>::relocate_sections( |
92e059d8 ILT |
800 | const General_options& options, |
801 | const Symbol_table* symtab, | |
802 | const Layout* layout, | |
803 | const unsigned char* pshdrs, | |
804 | Views* pviews) | |
61ba1cf9 ILT |
805 | { |
806 | unsigned int shnum = this->shnum(); | |
029ba973 ILT |
807 | Sized_target<size, big_endian>* target = |
808 | parameters->sized_target<size, big_endian>(); | |
61ba1cf9 | 809 | |
ef9beddf ILT |
810 | const Output_sections& out_sections(this->output_sections()); |
811 | const std::vector<Address>& out_offsets(this->section_offsets_); | |
730cdc88 | 812 | |
92e059d8 ILT |
813 | Relocate_info<size, big_endian> relinfo; |
814 | relinfo.options = &options; | |
815 | relinfo.symtab = symtab; | |
816 | relinfo.layout = layout; | |
817 | relinfo.object = this; | |
92e059d8 | 818 | |
61ba1cf9 ILT |
819 | const unsigned char* p = pshdrs + This::shdr_size; |
820 | for (unsigned int i = 1; i < shnum; ++i, p += This::shdr_size) | |
821 | { | |
822 | typename This::Shdr shdr(p); | |
823 | ||
824 | unsigned int sh_type = shdr.get_sh_type(); | |
825 | if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA) | |
826 | continue; | |
827 | ||
1307d6cd ILT |
828 | off_t sh_size = shdr.get_sh_size(); |
829 | if (sh_size == 0) | |
830 | continue; | |
831 | ||
d491d34e | 832 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); |
61ba1cf9 ILT |
833 | if (index >= this->shnum()) |
834 | { | |
75f2446e ILT |
835 | this->error(_("relocation section %u has bad info %u"), |
836 | i, index); | |
837 | continue; | |
61ba1cf9 ILT |
838 | } |
839 | ||
ef9beddf | 840 | Output_section* os = out_sections[index]; |
730cdc88 | 841 | if (os == NULL) |
61ba1cf9 ILT |
842 | { |
843 | // This relocation section is against a section which we | |
844 | // discarded. | |
845 | continue; | |
846 | } | |
ef9beddf | 847 | Address output_offset = out_offsets[index]; |
61ba1cf9 | 848 | |
a3ad94ed | 849 | gold_assert((*pviews)[index].view != NULL); |
8851ecca | 850 | if (parameters->options().relocatable()) |
6a74a719 | 851 | gold_assert((*pviews)[i].view != NULL); |
61ba1cf9 | 852 | |
d491d34e | 853 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx_) |
61ba1cf9 | 854 | { |
75f2446e ILT |
855 | gold_error(_("relocation section %u uses unexpected " |
856 | "symbol table %u"), | |
d491d34e | 857 | i, this->adjust_shndx(shdr.get_sh_link())); |
75f2446e | 858 | continue; |
61ba1cf9 ILT |
859 | } |
860 | ||
61ba1cf9 | 861 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), |
39d0cb0e | 862 | sh_size, true, false); |
61ba1cf9 ILT |
863 | |
864 | unsigned int reloc_size; | |
865 | if (sh_type == elfcpp::SHT_REL) | |
866 | reloc_size = elfcpp::Elf_sizes<size>::rel_size; | |
867 | else | |
868 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
869 | ||
870 | if (reloc_size != shdr.get_sh_entsize()) | |
871 | { | |
75f2446e ILT |
872 | gold_error(_("unexpected entsize for reloc section %u: %lu != %u"), |
873 | i, static_cast<unsigned long>(shdr.get_sh_entsize()), | |
730cdc88 | 874 | reloc_size); |
75f2446e | 875 | continue; |
61ba1cf9 ILT |
876 | } |
877 | ||
878 | size_t reloc_count = sh_size / reloc_size; | |
f5c3f225 | 879 | if (static_cast<off_t>(reloc_count * reloc_size) != sh_size) |
61ba1cf9 | 880 | { |
75f2446e ILT |
881 | gold_error(_("reloc section %u size %lu uneven"), |
882 | i, static_cast<unsigned long>(sh_size)); | |
883 | continue; | |
61ba1cf9 ILT |
884 | } |
885 | ||
eff45813 | 886 | gold_assert(output_offset != invalid_address |
96803768 ILT |
887 | || this->relocs_must_follow_section_writes()); |
888 | ||
92e059d8 ILT |
889 | relinfo.reloc_shndx = i; |
890 | relinfo.data_shndx = index; | |
8851ecca | 891 | if (!parameters->options().relocatable()) |
7019cd25 ILT |
892 | { |
893 | target->relocate_section(&relinfo, | |
894 | sh_type, | |
895 | prelocs, | |
896 | reloc_count, | |
897 | os, | |
eff45813 | 898 | output_offset == invalid_address, |
7019cd25 ILT |
899 | (*pviews)[index].view, |
900 | (*pviews)[index].address, | |
901 | (*pviews)[index].view_size); | |
8851ecca | 902 | if (parameters->options().emit_relocs()) |
7019cd25 ILT |
903 | this->emit_relocs(&relinfo, i, sh_type, prelocs, reloc_count, |
904 | os, output_offset, | |
905 | (*pviews)[index].view, | |
906 | (*pviews)[index].address, | |
907 | (*pviews)[index].view_size, | |
908 | (*pviews)[i].view, | |
909 | (*pviews)[i].view_size); | |
910 | } | |
6a74a719 ILT |
911 | else |
912 | { | |
913 | Relocatable_relocs* rr = this->relocatable_relocs(i); | |
914 | target->relocate_for_relocatable(&relinfo, | |
915 | sh_type, | |
916 | prelocs, | |
917 | reloc_count, | |
918 | os, | |
919 | output_offset, | |
920 | rr, | |
921 | (*pviews)[index].view, | |
922 | (*pviews)[index].address, | |
923 | (*pviews)[index].view_size, | |
924 | (*pviews)[i].view, | |
925 | (*pviews)[i].view_size); | |
926 | } | |
61ba1cf9 ILT |
927 | } |
928 | } | |
929 | ||
7019cd25 ILT |
930 | // Emit the relocs for --emit-relocs. |
931 | ||
932 | template<int size, bool big_endian> | |
933 | void | |
934 | Sized_relobj<size, big_endian>::emit_relocs( | |
935 | const Relocate_info<size, big_endian>* relinfo, | |
936 | unsigned int i, | |
937 | unsigned int sh_type, | |
938 | const unsigned char* prelocs, | |
939 | size_t reloc_count, | |
940 | Output_section* output_section, | |
ef9beddf | 941 | typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section, |
7019cd25 ILT |
942 | unsigned char* view, |
943 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
944 | section_size_type view_size, | |
945 | unsigned char* reloc_view, | |
946 | section_size_type reloc_view_size) | |
947 | { | |
948 | if (sh_type == elfcpp::SHT_REL) | |
949 | this->emit_relocs_reltype<elfcpp::SHT_REL>(relinfo, i, prelocs, | |
950 | reloc_count, output_section, | |
951 | offset_in_output_section, | |
952 | view, address, view_size, | |
953 | reloc_view, reloc_view_size); | |
954 | else | |
955 | { | |
956 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
957 | this->emit_relocs_reltype<elfcpp::SHT_RELA>(relinfo, i, prelocs, | |
958 | reloc_count, output_section, | |
959 | offset_in_output_section, | |
960 | view, address, view_size, | |
961 | reloc_view, reloc_view_size); | |
962 | } | |
963 | } | |
964 | ||
965 | // Emit the relocs for --emit-relocs, templatized on the type of the | |
966 | // relocation section. | |
967 | ||
968 | template<int size, bool big_endian> | |
969 | template<int sh_type> | |
970 | void | |
971 | Sized_relobj<size, big_endian>::emit_relocs_reltype( | |
972 | const Relocate_info<size, big_endian>* relinfo, | |
973 | unsigned int i, | |
974 | const unsigned char* prelocs, | |
975 | size_t reloc_count, | |
976 | Output_section* output_section, | |
ef9beddf | 977 | typename elfcpp::Elf_types<size>::Elf_Addr offset_in_output_section, |
7019cd25 ILT |
978 | unsigned char* view, |
979 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
980 | section_size_type view_size, | |
981 | unsigned char* reloc_view, | |
982 | section_size_type reloc_view_size) | |
983 | { | |
984 | const Relocatable_relocs* rr = this->relocatable_relocs(i); | |
985 | relocate_for_relocatable<size, big_endian, sh_type>( | |
986 | relinfo, | |
987 | prelocs, | |
988 | reloc_count, | |
989 | output_section, | |
990 | offset_in_output_section, | |
991 | rr, | |
992 | view, | |
993 | address, | |
994 | view_size, | |
995 | reloc_view, | |
996 | reloc_view_size); | |
997 | } | |
998 | ||
a9a60db6 ILT |
999 | // Create merge hash tables for the local symbols. These are used to |
1000 | // speed up relocations. | |
1001 | ||
1002 | template<int size, bool big_endian> | |
1003 | void | |
1004 | Sized_relobj<size, big_endian>::initialize_input_to_output_maps() | |
1005 | { | |
1006 | const unsigned int loccount = this->local_symbol_count_; | |
1007 | for (unsigned int i = 1; i < loccount; ++i) | |
1008 | { | |
1009 | Symbol_value<size>& lv(this->local_values_[i]); | |
1010 | lv.initialize_input_to_output_map(this); | |
1011 | } | |
1012 | } | |
1013 | ||
1014 | // Free merge hash tables for the local symbols. | |
1015 | ||
1016 | template<int size, bool big_endian> | |
1017 | void | |
1018 | Sized_relobj<size, big_endian>::free_input_to_output_maps() | |
1019 | { | |
1020 | const unsigned int loccount = this->local_symbol_count_; | |
1021 | for (unsigned int i = 1; i < loccount; ++i) | |
1022 | { | |
1023 | Symbol_value<size>& lv(this->local_values_[i]); | |
1024 | lv.free_input_to_output_map(); | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | // Class Merged_symbol_value. | |
1029 | ||
1030 | template<int size> | |
1031 | void | |
1032 | Merged_symbol_value<size>::initialize_input_to_output_map( | |
1033 | const Relobj* object, | |
1034 | unsigned int input_shndx) | |
1035 | { | |
1036 | Object_merge_map* map = object->merge_map(); | |
1037 | map->initialize_input_to_output_map<size>(input_shndx, | |
1038 | this->output_start_address_, | |
1039 | &this->output_addresses_); | |
1040 | } | |
1041 | ||
1042 | // Get the output value corresponding to an input offset if we | |
1043 | // couldn't find it in the hash table. | |
1044 | ||
1045 | template<int size> | |
1046 | typename elfcpp::Elf_types<size>::Elf_Addr | |
1047 | Merged_symbol_value<size>::value_from_output_section( | |
1048 | const Relobj* object, | |
1049 | unsigned int input_shndx, | |
1050 | typename elfcpp::Elf_types<size>::Elf_Addr input_offset) const | |
1051 | { | |
1052 | section_offset_type output_offset; | |
1053 | bool found = object->merge_map()->get_output_offset(NULL, input_shndx, | |
1054 | input_offset, | |
1055 | &output_offset); | |
1056 | ||
1057 | // If this assertion fails, it means that some relocation was | |
1058 | // against a portion of an input merge section which we didn't map | |
1059 | // to the output file and we didn't explicitly discard. We should | |
1060 | // always map all portions of input merge sections. | |
1061 | gold_assert(found); | |
1062 | ||
1063 | if (output_offset == -1) | |
1064 | return 0; | |
1065 | else | |
1066 | return this->output_start_address_ + output_offset; | |
1067 | } | |
1068 | ||
730cdc88 ILT |
1069 | // Track_relocs methods. |
1070 | ||
1071 | // Initialize the class to track the relocs. This gets the object, | |
1072 | // the reloc section index, and the type of the relocs. This returns | |
1073 | // false if something goes wrong. | |
1074 | ||
1075 | template<int size, bool big_endian> | |
1076 | bool | |
1077 | Track_relocs<size, big_endian>::initialize( | |
b696e6d4 | 1078 | Object* object, |
730cdc88 ILT |
1079 | unsigned int reloc_shndx, |
1080 | unsigned int reloc_type) | |
1081 | { | |
730cdc88 ILT |
1082 | // If RELOC_SHNDX is -1U, it means there is more than one reloc |
1083 | // section for the .eh_frame section. We can't handle that case. | |
1084 | if (reloc_shndx == -1U) | |
1085 | return false; | |
1086 | ||
1087 | // If RELOC_SHNDX is 0, there is no reloc section. | |
1088 | if (reloc_shndx == 0) | |
1089 | return true; | |
1090 | ||
1091 | // Get the contents of the reloc section. | |
1092 | this->prelocs_ = object->section_contents(reloc_shndx, &this->len_, false); | |
1093 | ||
1094 | if (reloc_type == elfcpp::SHT_REL) | |
1095 | this->reloc_size_ = elfcpp::Elf_sizes<size>::rel_size; | |
1096 | else if (reloc_type == elfcpp::SHT_RELA) | |
1097 | this->reloc_size_ = elfcpp::Elf_sizes<size>::rela_size; | |
1098 | else | |
1099 | gold_unreachable(); | |
1100 | ||
1101 | if (this->len_ % this->reloc_size_ != 0) | |
1102 | { | |
1103 | object->error(_("reloc section size %zu is not a multiple of " | |
1104 | "reloc size %d\n"), | |
1105 | static_cast<size_t>(this->len_), | |
1106 | this->reloc_size_); | |
1107 | return false; | |
1108 | } | |
1109 | ||
1110 | return true; | |
1111 | } | |
1112 | ||
1113 | // Return the offset of the next reloc, or -1 if there isn't one. | |
1114 | ||
1115 | template<int size, bool big_endian> | |
1116 | off_t | |
1117 | Track_relocs<size, big_endian>::next_offset() const | |
1118 | { | |
1119 | if (this->pos_ >= this->len_) | |
1120 | return -1; | |
1121 | ||
1122 | // Rel and Rela start out the same, so we can always use Rel to find | |
1123 | // the r_offset value. | |
1124 | elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_); | |
1125 | return rel.get_r_offset(); | |
1126 | } | |
1127 | ||
1128 | // Return the index of the symbol referenced by the next reloc, or -1U | |
1129 | // if there aren't any more relocs. | |
1130 | ||
1131 | template<int size, bool big_endian> | |
1132 | unsigned int | |
1133 | Track_relocs<size, big_endian>::next_symndx() const | |
1134 | { | |
1135 | if (this->pos_ >= this->len_) | |
1136 | return -1U; | |
1137 | ||
1138 | // Rel and Rela start out the same, so we can use Rel to find the | |
1139 | // symbol index. | |
1140 | elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_); | |
1141 | return elfcpp::elf_r_sym<size>(rel.get_r_info()); | |
1142 | } | |
1143 | ||
1144 | // Advance to the next reloc whose r_offset is greater than or equal | |
1145 | // to OFFSET. Return the number of relocs we skip. | |
1146 | ||
1147 | template<int size, bool big_endian> | |
1148 | int | |
1149 | Track_relocs<size, big_endian>::advance(off_t offset) | |
1150 | { | |
1151 | int ret = 0; | |
1152 | while (this->pos_ < this->len_) | |
1153 | { | |
1154 | // Rel and Rela start out the same, so we can always use Rel to | |
1155 | // find the r_offset value. | |
1156 | elfcpp::Rel<size, big_endian> rel(this->prelocs_ + this->pos_); | |
1157 | if (static_cast<off_t>(rel.get_r_offset()) >= offset) | |
1158 | break; | |
1159 | ++ret; | |
1160 | this->pos_ += this->reloc_size_; | |
1161 | } | |
1162 | return ret; | |
1163 | } | |
1164 | ||
12c0daef | 1165 | // Instantiate the templates we need. |
61ba1cf9 | 1166 | |
193a53d9 | 1167 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
1168 | template |
1169 | void | |
f6ce93d6 | 1170 | Sized_relobj<32, false>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1171 | #endif |
92e059d8 | 1172 | |
193a53d9 | 1173 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
1174 | template |
1175 | void | |
f6ce93d6 | 1176 | Sized_relobj<32, true>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1177 | #endif |
92e059d8 | 1178 | |
193a53d9 | 1179 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
1180 | template |
1181 | void | |
f6ce93d6 | 1182 | Sized_relobj<64, false>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1183 | #endif |
92e059d8 | 1184 | |
193a53d9 | 1185 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
1186 | template |
1187 | void | |
f6ce93d6 | 1188 | Sized_relobj<64, true>::do_read_relocs(Read_relocs_data* rd); |
193a53d9 | 1189 | #endif |
92e059d8 | 1190 | |
6d03d481 ST |
1191 | #ifdef HAVE_TARGET_32_LITTLE |
1192 | template | |
1193 | void | |
1194 | Sized_relobj<32, false>::do_gc_process_relocs(const General_options& options, | |
1195 | Symbol_table* symtab, | |
1196 | Layout* layout, | |
1197 | Read_relocs_data* rd); | |
1198 | #endif | |
1199 | ||
1200 | #ifdef HAVE_TARGET_32_BIG | |
1201 | template | |
1202 | void | |
1203 | Sized_relobj<32, true>::do_gc_process_relocs(const General_options& options, | |
1204 | Symbol_table* symtab, | |
1205 | Layout* layout, | |
1206 | Read_relocs_data* rd); | |
1207 | #endif | |
1208 | ||
1209 | #ifdef HAVE_TARGET_64_LITTLE | |
1210 | template | |
1211 | void | |
1212 | Sized_relobj<64, false>::do_gc_process_relocs(const General_options& options, | |
1213 | Symbol_table* symtab, | |
1214 | Layout* layout, | |
1215 | Read_relocs_data* rd); | |
1216 | #endif | |
1217 | ||
1218 | #ifdef HAVE_TARGET_64_BIG | |
1219 | template | |
1220 | void | |
1221 | Sized_relobj<64, true>::do_gc_process_relocs(const General_options& options, | |
1222 | Symbol_table* symtab, | |
1223 | Layout* layout, | |
1224 | Read_relocs_data* rd); | |
1225 | #endif | |
1226 | ||
193a53d9 | 1227 | #ifdef HAVE_TARGET_32_LITTLE |
92e059d8 ILT |
1228 | template |
1229 | void | |
f6ce93d6 | 1230 | Sized_relobj<32, false>::do_scan_relocs(const General_options& options, |
92e059d8 | 1231 | Symbol_table* symtab, |
ead1e424 | 1232 | Layout* layout, |
92e059d8 | 1233 | Read_relocs_data* rd); |
193a53d9 | 1234 | #endif |
92e059d8 | 1235 | |
193a53d9 | 1236 | #ifdef HAVE_TARGET_32_BIG |
92e059d8 ILT |
1237 | template |
1238 | void | |
f6ce93d6 | 1239 | Sized_relobj<32, true>::do_scan_relocs(const General_options& options, |
92e059d8 | 1240 | Symbol_table* symtab, |
ead1e424 | 1241 | Layout* layout, |
92e059d8 | 1242 | Read_relocs_data* rd); |
193a53d9 | 1243 | #endif |
92e059d8 | 1244 | |
193a53d9 | 1245 | #ifdef HAVE_TARGET_64_LITTLE |
92e059d8 ILT |
1246 | template |
1247 | void | |
f6ce93d6 | 1248 | Sized_relobj<64, false>::do_scan_relocs(const General_options& options, |
92e059d8 | 1249 | Symbol_table* symtab, |
ead1e424 | 1250 | Layout* layout, |
92e059d8 | 1251 | Read_relocs_data* rd); |
193a53d9 | 1252 | #endif |
92e059d8 | 1253 | |
193a53d9 | 1254 | #ifdef HAVE_TARGET_64_BIG |
92e059d8 ILT |
1255 | template |
1256 | void | |
f6ce93d6 | 1257 | Sized_relobj<64, true>::do_scan_relocs(const General_options& options, |
92e059d8 | 1258 | Symbol_table* symtab, |
ead1e424 | 1259 | Layout* layout, |
92e059d8 | 1260 | Read_relocs_data* rd); |
193a53d9 | 1261 | #endif |
92e059d8 | 1262 | |
193a53d9 | 1263 | #ifdef HAVE_TARGET_32_LITTLE |
61ba1cf9 ILT |
1264 | template |
1265 | void | |
f6ce93d6 | 1266 | Sized_relobj<32, false>::do_relocate(const General_options& options, |
61ba1cf9 | 1267 | const Symbol_table* symtab, |
92e059d8 | 1268 | const Layout* layout, |
61ba1cf9 | 1269 | Output_file* of); |
193a53d9 | 1270 | #endif |
61ba1cf9 | 1271 | |
193a53d9 | 1272 | #ifdef HAVE_TARGET_32_BIG |
61ba1cf9 ILT |
1273 | template |
1274 | void | |
f6ce93d6 | 1275 | Sized_relobj<32, true>::do_relocate(const General_options& options, |
61ba1cf9 | 1276 | const Symbol_table* symtab, |
92e059d8 | 1277 | const Layout* layout, |
61ba1cf9 | 1278 | Output_file* of); |
193a53d9 | 1279 | #endif |
61ba1cf9 | 1280 | |
193a53d9 | 1281 | #ifdef HAVE_TARGET_64_LITTLE |
61ba1cf9 ILT |
1282 | template |
1283 | void | |
f6ce93d6 | 1284 | Sized_relobj<64, false>::do_relocate(const General_options& options, |
61ba1cf9 | 1285 | const Symbol_table* symtab, |
92e059d8 | 1286 | const Layout* layout, |
61ba1cf9 | 1287 | Output_file* of); |
193a53d9 | 1288 | #endif |
61ba1cf9 | 1289 | |
193a53d9 | 1290 | #ifdef HAVE_TARGET_64_BIG |
61ba1cf9 ILT |
1291 | template |
1292 | void | |
f6ce93d6 | 1293 | Sized_relobj<64, true>::do_relocate(const General_options& options, |
61ba1cf9 | 1294 | const Symbol_table* symtab, |
92e059d8 | 1295 | const Layout* layout, |
61ba1cf9 | 1296 | Output_file* of); |
193a53d9 | 1297 | #endif |
61ba1cf9 | 1298 | |
a9a60db6 ILT |
1299 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) |
1300 | template | |
1301 | class Merged_symbol_value<32>; | |
1302 | #endif | |
1303 | ||
1304 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1305 | template | |
1306 | class Merged_symbol_value<64>; | |
1307 | #endif | |
1308 | ||
1309 | #if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_32_BIG) | |
1310 | template | |
1311 | class Symbol_value<32>; | |
1312 | #endif | |
1313 | ||
1314 | #if defined(HAVE_TARGET_64_LITTLE) || defined(HAVE_TARGET_64_BIG) | |
1315 | template | |
1316 | class Symbol_value<64>; | |
1317 | #endif | |
1318 | ||
730cdc88 ILT |
1319 | #ifdef HAVE_TARGET_32_LITTLE |
1320 | template | |
1321 | class Track_relocs<32, false>; | |
1322 | #endif | |
1323 | ||
1324 | #ifdef HAVE_TARGET_32_BIG | |
1325 | template | |
1326 | class Track_relocs<32, true>; | |
1327 | #endif | |
1328 | ||
1329 | #ifdef HAVE_TARGET_64_LITTLE | |
1330 | template | |
1331 | class Track_relocs<64, false>; | |
1332 | #endif | |
1333 | ||
1334 | #ifdef HAVE_TARGET_64_BIG | |
1335 | template | |
1336 | class Track_relocs<64, true>; | |
1337 | #endif | |
1338 | ||
61ba1cf9 | 1339 | } // End namespace gold. |