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61ba1cf9 ILT |
1 | // reloc.h -- relocate input files for gold -*- C++ -*- |
2 | ||
6cb15b7f ILT |
3 | // Copyright 2006, 2007 Free Software Foundation, Inc. |
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 | #ifndef GOLD_RELOC_H |
24 | #define GOLD_RELOC_H | |
25 | ||
17a1d0a9 | 26 | #include <vector> |
92e059d8 ILT |
27 | #include <byteswap.h> |
28 | ||
4c50553d | 29 | #include "elfcpp.h" |
61ba1cf9 ILT |
30 | #include "workqueue.h" |
31 | ||
32 | namespace gold | |
33 | { | |
34 | ||
a3ad94ed | 35 | class General_options; |
b696e6d4 | 36 | class Object; |
f6ce93d6 | 37 | class Relobj; |
92e059d8 | 38 | class Read_relocs_data; |
a3ad94ed | 39 | class Symbol; |
ead1e424 | 40 | class Layout; |
6a74a719 | 41 | class Output_data; |
4f4c5f80 | 42 | class Output_section; |
92e059d8 | 43 | |
5a6f7e2d ILT |
44 | template<int size> |
45 | class Sized_symbol; | |
46 | ||
b8e6aad9 ILT |
47 | template<int size, bool big_endian> |
48 | class Sized_relobj; | |
49 | ||
50 | template<int size> | |
51 | class Symbol_value; | |
52 | ||
5a6f7e2d ILT |
53 | template<int sh_type, bool dynamic, int size, bool big_endian> |
54 | class Output_data_reloc; | |
55 | ||
92e059d8 ILT |
56 | // A class to read the relocations for an object file, and then queue |
57 | // up a task to see if they require any GOT/PLT/COPY relocations in | |
58 | // the symbol table. | |
59 | ||
60 | class Read_relocs : public Task | |
61 | { | |
62 | public: | |
63 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
64 | // unblocked when the Scan_relocs task completes. | |
65 | Read_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 66 | Layout* layout, Relobj* object, Task_token* symtab_lock, |
92e059d8 | 67 | Task_token* blocker) |
ead1e424 | 68 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
92e059d8 ILT |
69 | symtab_lock_(symtab_lock), blocker_(blocker) |
70 | { } | |
71 | ||
72 | // The standard Task methods. | |
73 | ||
17a1d0a9 ILT |
74 | Task_token* |
75 | is_runnable(); | |
92e059d8 | 76 | |
17a1d0a9 ILT |
77 | void |
78 | locks(Task_locker*); | |
92e059d8 ILT |
79 | |
80 | void | |
81 | run(Workqueue*); | |
82 | ||
c7912668 ILT |
83 | std::string |
84 | get_name() const; | |
85 | ||
92e059d8 ILT |
86 | private: |
87 | const General_options& options_; | |
88 | Symbol_table* symtab_; | |
ead1e424 | 89 | Layout* layout_; |
f6ce93d6 | 90 | Relobj* object_; |
92e059d8 ILT |
91 | Task_token* symtab_lock_; |
92 | Task_token* blocker_; | |
93 | }; | |
94 | ||
95 | // Scan the relocations for an object to see if they require any | |
96 | // GOT/PLT/COPY relocations. | |
97 | ||
98 | class Scan_relocs : public Task | |
99 | { | |
100 | public: | |
101 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
102 | // unblocked when the task completes. | |
103 | Scan_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 104 | Layout* layout, Relobj* object, Read_relocs_data* rd, |
ead1e424 ILT |
105 | Task_token* symtab_lock, Task_token* blocker) |
106 | : options_(options), symtab_(symtab), layout_(layout), object_(object), | |
107 | rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker) | |
92e059d8 ILT |
108 | { } |
109 | ||
110 | // The standard Task methods. | |
111 | ||
17a1d0a9 ILT |
112 | Task_token* |
113 | is_runnable(); | |
92e059d8 | 114 | |
17a1d0a9 ILT |
115 | void |
116 | locks(Task_locker*); | |
92e059d8 ILT |
117 | |
118 | void | |
119 | run(Workqueue*); | |
120 | ||
c7912668 ILT |
121 | std::string |
122 | get_name() const; | |
123 | ||
92e059d8 | 124 | private: |
92e059d8 ILT |
125 | const General_options& options_; |
126 | Symbol_table* symtab_; | |
ead1e424 | 127 | Layout* layout_; |
f6ce93d6 | 128 | Relobj* object_; |
92e059d8 ILT |
129 | Read_relocs_data* rd_; |
130 | Task_token* symtab_lock_; | |
131 | Task_token* blocker_; | |
132 | }; | |
133 | ||
134 | // A class to perform all the relocations for an object file. | |
135 | ||
61ba1cf9 ILT |
136 | class Relocate_task : public Task |
137 | { | |
138 | public: | |
139 | Relocate_task(const General_options& options, const Symbol_table* symtab, | |
f6ce93d6 | 140 | const Layout* layout, Relobj* object, Output_file* of, |
730cdc88 ILT |
141 | Task_token* input_sections_blocker, |
142 | Task_token* output_sections_blocker, Task_token* final_blocker) | |
92e059d8 | 143 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
730cdc88 ILT |
144 | of_(of), input_sections_blocker_(input_sections_blocker), |
145 | output_sections_blocker_(output_sections_blocker), | |
146 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
147 | { } |
148 | ||
149 | // The standard Task methods. | |
150 | ||
17a1d0a9 ILT |
151 | Task_token* |
152 | is_runnable(); | |
61ba1cf9 | 153 | |
17a1d0a9 ILT |
154 | void |
155 | locks(Task_locker*); | |
61ba1cf9 ILT |
156 | |
157 | void | |
158 | run(Workqueue*); | |
159 | ||
c7912668 ILT |
160 | std::string |
161 | get_name() const; | |
162 | ||
61ba1cf9 | 163 | private: |
61ba1cf9 ILT |
164 | const General_options& options_; |
165 | const Symbol_table* symtab_; | |
92e059d8 | 166 | const Layout* layout_; |
f6ce93d6 | 167 | Relobj* object_; |
61ba1cf9 | 168 | Output_file* of_; |
730cdc88 ILT |
169 | Task_token* input_sections_blocker_; |
170 | Task_token* output_sections_blocker_; | |
61ba1cf9 ILT |
171 | Task_token* final_blocker_; |
172 | }; | |
173 | ||
6a74a719 ILT |
174 | // During a relocatable link, this class records how relocations |
175 | // should be handled for a single input reloc section. An instance of | |
176 | // this class is created while scanning relocs, and it is used while | |
177 | // processing relocs. | |
178 | ||
179 | class Relocatable_relocs | |
180 | { | |
181 | public: | |
182 | // We use a vector of unsigned char to indicate how the input relocs | |
183 | // should be handled. Each element is one of the following values. | |
184 | // We create this vector when we initially scan the relocations. | |
185 | enum Reloc_strategy | |
186 | { | |
187 | // Copy the input reloc. Don't modify it other than updating the | |
188 | // r_offset field and the r_sym part of the r_info field. | |
189 | RELOC_COPY, | |
190 | // Copy the input reloc which is against an STT_SECTION symbol. | |
191 | // Update the r_offset and r_sym part of the r_info field. Adjust | |
192 | // the addend by subtracting the value of the old local symbol and | |
193 | // adding the value of the new local symbol. The addend is in the | |
194 | // SHT_RELA reloc and the contents of the data section do not need | |
195 | // to be changed. | |
196 | RELOC_ADJUST_FOR_SECTION_RELA, | |
197 | // Like RELOC_ADJUST_FOR_SECTION_RELA but the contents of the | |
198 | // section need to be changed. The number indicates the number of | |
199 | // bytes in the addend in the section contents. | |
200 | RELOC_ADJUST_FOR_SECTION_1, | |
201 | RELOC_ADJUST_FOR_SECTION_2, | |
202 | RELOC_ADJUST_FOR_SECTION_4, | |
203 | RELOC_ADJUST_FOR_SECTION_8, | |
204 | // Discard the input reloc--process it completely when relocating | |
205 | // the data section contents. | |
206 | RELOC_DISCARD, | |
207 | // An input reloc which is not discarded, but which requires | |
208 | // target specific processing in order to update it. | |
209 | RELOC_SPECIAL | |
210 | }; | |
211 | ||
212 | Relocatable_relocs() | |
213 | : reloc_strategies_(), output_reloc_count_(0), posd_(NULL) | |
214 | { } | |
215 | ||
216 | // Record the number of relocs. | |
217 | void | |
218 | set_reloc_count(size_t reloc_count) | |
219 | { this->reloc_strategies_.reserve(reloc_count); } | |
220 | ||
221 | // Record what to do for the next reloc. | |
222 | void | |
223 | set_next_reloc_strategy(Reloc_strategy strategy) | |
224 | { | |
225 | this->reloc_strategies_.push_back(static_cast<unsigned char>(strategy)); | |
226 | if (strategy != RELOC_DISCARD) | |
227 | ++this->output_reloc_count_; | |
228 | } | |
229 | ||
230 | // Record the Output_data associated with this reloc section. | |
231 | void | |
232 | set_output_data(Output_data* posd) | |
233 | { | |
234 | gold_assert(this->posd_ == NULL); | |
235 | this->posd_ = posd; | |
236 | } | |
237 | ||
238 | // Return the Output_data associated with this reloc section. | |
239 | Output_data* | |
240 | output_data() const | |
241 | { return this->posd_; } | |
242 | ||
243 | // Return what to do for reloc I. | |
244 | Reloc_strategy | |
245 | strategy(unsigned int i) const | |
246 | { | |
247 | gold_assert(i < this->reloc_strategies_.size()); | |
248 | return static_cast<Reloc_strategy>(this->reloc_strategies_[i]); | |
249 | } | |
250 | ||
251 | // Return the number of relocations to create in the output file. | |
252 | size_t | |
253 | output_reloc_count() const | |
254 | { return this->output_reloc_count_; } | |
255 | ||
256 | private: | |
257 | typedef std::vector<unsigned char> Reloc_strategies; | |
258 | ||
259 | // The strategies for the input reloc. There is one entry in this | |
260 | // vector for each relocation in the input section. | |
261 | Reloc_strategies reloc_strategies_; | |
262 | // The number of relocations to be created in the output file. | |
263 | size_t output_reloc_count_; | |
264 | // The output data structure associated with this relocation. | |
265 | Output_data* posd_; | |
266 | }; | |
267 | ||
92e059d8 ILT |
268 | // Standard relocation routines which are used on many targets. Here |
269 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
270 | ||
271 | template<int size, bool big_endian> | |
272 | class Relocate_functions | |
273 | { | |
274 | private: | |
275 | // Do a simple relocation with the addend in the section contents. | |
276 | // VALSIZE is the size of the value. | |
277 | template<int valsize> | |
278 | static inline void | |
f6ce93d6 ILT |
279 | rel(unsigned char* view, |
280 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
92e059d8 | 281 | { |
f6ce93d6 | 282 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 283 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
284 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
285 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value); | |
92e059d8 ILT |
286 | } |
287 | ||
b8e6aad9 ILT |
288 | // Do a simple relocation using a Symbol_value with the addend in |
289 | // the section contents. VALSIZE is the size of the value to | |
290 | // relocate. | |
291 | template<int valsize> | |
292 | static inline void | |
293 | rel(unsigned char* view, | |
294 | const Sized_relobj<size, big_endian>* object, | |
295 | const Symbol_value<size>* psymval) | |
296 | { | |
297 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
298 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
299 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
300 | x = psymval->value(object, x); | |
301 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
302 | } | |
303 | ||
d830e0e0 ILT |
304 | // Do a simple relocation with the addend in the relocation. |
305 | // VALSIZE is the size of the value. | |
306 | template<int valsize> | |
307 | static inline void | |
308 | rela(unsigned char* view, | |
309 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
310 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
311 | { | |
312 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
313 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
314 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend); | |
315 | } | |
316 | ||
317 | // Do a simple relocation using a symbol value with the addend in | |
318 | // the relocation. VALSIZE is the size of the value. | |
319 | template<int valsize> | |
320 | static inline void | |
321 | rela(unsigned char* view, | |
322 | const Sized_relobj<size, big_endian>* object, | |
323 | const Symbol_value<size>* psymval, | |
324 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
325 | { | |
326 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
327 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
328 | Valtype x = psymval->value(object, addend); | |
329 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
330 | } | |
331 | ||
92e059d8 ILT |
332 | // Do a simple PC relative relocation with the addend in the section |
333 | // contents. VALSIZE is the size of the value. | |
334 | template<int valsize> | |
335 | static inline void | |
f6ce93d6 ILT |
336 | pcrel(unsigned char* view, |
337 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
92e059d8 ILT |
338 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
339 | { | |
f6ce93d6 | 340 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 341 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
342 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
343 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
92e059d8 ILT |
344 | } |
345 | ||
b8e6aad9 ILT |
346 | // Do a simple PC relative relocation with a Symbol_value with the |
347 | // addend in the section contents. VALSIZE is the size of the | |
348 | // value. | |
349 | template<int valsize> | |
350 | static inline void | |
351 | pcrel(unsigned char* view, | |
352 | const Sized_relobj<size, big_endian>* object, | |
353 | const Symbol_value<size>* psymval, | |
354 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
355 | { | |
356 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
357 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
358 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
359 | x = psymval->value(object, x); | |
360 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
361 | } | |
362 | ||
d830e0e0 ILT |
363 | // Do a simple PC relative relocation with the addend in the |
364 | // relocation. VALSIZE is the size of the value. | |
365 | template<int valsize> | |
366 | static inline void | |
367 | pcrela(unsigned char* view, | |
368 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
369 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
370 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
371 | { | |
372 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
373 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
374 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address); | |
375 | } | |
376 | ||
377 | // Do a simple PC relative relocation with a Symbol_value with the | |
378 | // addend in the relocation. VALSIZE is the size of the value. | |
379 | template<int valsize> | |
380 | static inline void | |
381 | pcrela(unsigned char* view, | |
382 | const Sized_relobj<size, big_endian>* object, | |
383 | const Symbol_value<size>* psymval, | |
384 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
385 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
386 | { | |
387 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
388 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
389 | Valtype x = psymval->value(object, addend); | |
390 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
391 | } | |
392 | ||
92e059d8 ILT |
393 | typedef Relocate_functions<size, big_endian> This; |
394 | ||
395 | public: | |
b8e6aad9 ILT |
396 | // Do a simple 8-bit REL relocation with the addend in the section |
397 | // contents. | |
92e059d8 ILT |
398 | static inline void |
399 | rel8(unsigned char* view, unsigned char value) | |
b8e6aad9 ILT |
400 | { This::template rel<8>(view, value); } |
401 | ||
402 | static inline void | |
403 | rel8(unsigned char* view, | |
404 | const Sized_relobj<size, big_endian>* object, | |
405 | const Symbol_value<size>* psymval) | |
406 | { This::template rel<8>(view, object, psymval); } | |
92e059d8 | 407 | |
d830e0e0 ILT |
408 | // Do an 8-bit RELA relocation with the addend in the relocation. |
409 | static inline void | |
5b3463d9 | 410 | rela8(unsigned char* view, unsigned char value, unsigned char addend) |
d830e0e0 ILT |
411 | { This::template rela<8>(view, value, addend); } |
412 | ||
413 | static inline void | |
5b3463d9 | 414 | rela8(unsigned char* view, |
d830e0e0 ILT |
415 | const Sized_relobj<size, big_endian>* object, |
416 | const Symbol_value<size>* psymval, | |
417 | unsigned char addend) | |
418 | { This::template rela<8>(view, object, psymval, addend); } | |
419 | ||
92e059d8 | 420 | // Do a simple 8-bit PC relative relocation with the addend in the |
b8e6aad9 | 421 | // section contents. |
92e059d8 ILT |
422 | static inline void |
423 | pcrel8(unsigned char* view, unsigned char value, | |
424 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
425 | { This::template pcrel<8>(view, value, address); } |
426 | ||
427 | static inline void | |
428 | pcrel8(unsigned char* view, | |
429 | const Sized_relobj<size, big_endian>* object, | |
430 | const Symbol_value<size>* psymval, | |
431 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
432 | { This::template pcrel<8>(view, object, psymval, address); } | |
92e059d8 | 433 | |
d830e0e0 ILT |
434 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
435 | // the reloc. | |
436 | static inline void | |
437 | pcrela8(unsigned char* view, unsigned char value, unsigned char addend, | |
438 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
439 | { This::template pcrela<8>(view, value, addend, address); } | |
440 | ||
441 | static inline void | |
442 | pcrela8(unsigned char* view, | |
443 | const Sized_relobj<size, big_endian>* object, | |
444 | const Symbol_value<size>* psymval, | |
445 | unsigned char addend, | |
446 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
447 | { This::template pcrela<8>(view, object, psymval, addend, address); } | |
448 | ||
b8e6aad9 ILT |
449 | // Do a simple 16-bit REL relocation with the addend in the section |
450 | // contents. | |
92e059d8 ILT |
451 | static inline void |
452 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
b8e6aad9 ILT |
453 | { This::template rel<16>(view, value); } |
454 | ||
455 | static inline void | |
456 | rel16(unsigned char* view, | |
457 | const Sized_relobj<size, big_endian>* object, | |
458 | const Symbol_value<size>* psymval) | |
459 | { This::template rel<16>(view, object, psymval); } | |
92e059d8 | 460 | |
d830e0e0 ILT |
461 | // Do an 16-bit RELA relocation with the addend in the relocation. |
462 | static inline void | |
463 | rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend) | |
464 | { This::template rela<16>(view, value, addend); } | |
465 | ||
466 | static inline void | |
467 | rela16(unsigned char* view, | |
468 | const Sized_relobj<size, big_endian>* object, | |
469 | const Symbol_value<size>* psymval, | |
470 | elfcpp::Elf_Half addend) | |
471 | { This::template rela<16>(view, object, psymval, addend); } | |
472 | ||
d830e0e0 | 473 | // Do a simple 16-bit PC relative REL relocation with the addend in |
b8e6aad9 | 474 | // the section contents. |
92e059d8 | 475 | static inline void |
d830e0e0 | 476 | pcrel16(unsigned char* view, elfcpp::Elf_Half value, |
92e059d8 | 477 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
478 | { This::template pcrel<16>(view, value, address); } |
479 | ||
480 | static inline void | |
481 | pcrel16(unsigned char* view, | |
482 | const Sized_relobj<size, big_endian>* object, | |
483 | const Symbol_value<size>* psymval, | |
484 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
485 | { This::template pcrel<16>(view, object, psymval, address); } | |
92e059d8 | 486 | |
d830e0e0 ILT |
487 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
488 | // the reloc. | |
489 | static inline void | |
490 | pcrela16(unsigned char* view, elfcpp::Elf_Half value, | |
491 | elfcpp::Elf_Half addend, | |
492 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
493 | { This::template pcrela<16>(view, value, addend, address); } | |
494 | ||
495 | static inline void | |
496 | pcrela16(unsigned char* view, | |
497 | const Sized_relobj<size, big_endian>* object, | |
498 | const Symbol_value<size>* psymval, | |
499 | elfcpp::Elf_Half addend, | |
500 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
501 | { This::template pcrela<16>(view, object, psymval, addend, address); } | |
502 | ||
92e059d8 ILT |
503 | // Do a simple 32-bit REL relocation with the addend in the section |
504 | // contents. | |
505 | static inline void | |
506 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
b8e6aad9 ILT |
507 | { This::template rel<32>(view, value); } |
508 | ||
509 | static inline void | |
510 | rel32(unsigned char* view, | |
511 | const Sized_relobj<size, big_endian>* object, | |
512 | const Symbol_value<size>* psymval) | |
513 | { This::template rel<32>(view, object, psymval); } | |
92e059d8 | 514 | |
d830e0e0 ILT |
515 | // Do an 32-bit RELA relocation with the addend in the relocation. |
516 | static inline void | |
517 | rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend) | |
518 | { This::template rela<32>(view, value, addend); } | |
519 | ||
520 | static inline void | |
521 | rela32(unsigned char* view, | |
522 | const Sized_relobj<size, big_endian>* object, | |
523 | const Symbol_value<size>* psymval, | |
524 | elfcpp::Elf_Word addend) | |
525 | { This::template rela<32>(view, object, psymval, addend); } | |
526 | ||
92e059d8 ILT |
527 | // Do a simple 32-bit PC relative REL relocation with the addend in |
528 | // the section contents. | |
529 | static inline void | |
530 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
531 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
532 | { This::template pcrel<32>(view, value, address); } |
533 | ||
534 | static inline void | |
535 | pcrel32(unsigned char* view, | |
536 | const Sized_relobj<size, big_endian>* object, | |
537 | const Symbol_value<size>* psymval, | |
538 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
539 | { This::template pcrel<32>(view, object, psymval, address); } | |
92e059d8 | 540 | |
d830e0e0 ILT |
541 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
542 | // the relocation. | |
543 | static inline void | |
544 | pcrela32(unsigned char* view, elfcpp::Elf_Word value, | |
545 | elfcpp::Elf_Word addend, | |
546 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
547 | { This::template pcrela<32>(view, value, addend, address); } | |
548 | ||
549 | static inline void | |
550 | pcrela32(unsigned char* view, | |
551 | const Sized_relobj<size, big_endian>* object, | |
552 | const Symbol_value<size>* psymval, | |
553 | elfcpp::Elf_Word addend, | |
554 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
555 | { This::template pcrela<32>(view, object, psymval, addend, address); } | |
556 | ||
92e059d8 ILT |
557 | // Do a simple 64-bit REL relocation with the addend in the section |
558 | // contents. | |
559 | static inline void | |
f6ce93d6 | 560 | rel64(unsigned char* view, elfcpp::Elf_Xword value) |
b8e6aad9 ILT |
561 | { This::template rel<64>(view, value); } |
562 | ||
563 | static inline void | |
564 | rel64(unsigned char* view, | |
565 | const Sized_relobj<size, big_endian>* object, | |
566 | const Symbol_value<size>* psymval) | |
567 | { This::template rel<64>(view, object, psymval); } | |
92e059d8 | 568 | |
d830e0e0 ILT |
569 | // Do a 64-bit RELA relocation with the addend in the relocation. |
570 | static inline void | |
571 | rela64(unsigned char* view, elfcpp::Elf_Xword value, | |
572 | elfcpp::Elf_Xword addend) | |
573 | { This::template rela<64>(view, value, addend); } | |
574 | ||
575 | static inline void | |
576 | rela64(unsigned char* view, | |
577 | const Sized_relobj<size, big_endian>* object, | |
578 | const Symbol_value<size>* psymval, | |
579 | elfcpp::Elf_Xword addend) | |
580 | { This::template rela<64>(view, object, psymval, addend); } | |
581 | ||
92e059d8 ILT |
582 | // Do a simple 64-bit PC relative REL relocation with the addend in |
583 | // the section contents. | |
584 | static inline void | |
f6ce93d6 | 585 | pcrel64(unsigned char* view, elfcpp::Elf_Xword value, |
92e059d8 | 586 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
587 | { This::template pcrel<64>(view, value, address); } |
588 | ||
589 | static inline void | |
590 | pcrel64(unsigned char* view, | |
591 | const Sized_relobj<size, big_endian>* object, | |
592 | const Symbol_value<size>* psymval, | |
593 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
594 | { This::template pcrel<64>(view, object, psymval, address); } | |
d830e0e0 ILT |
595 | |
596 | // Do a simple 64-bit PC relative RELA relocation with the addend in | |
597 | // the relocation. | |
598 | static inline void | |
599 | pcrela64(unsigned char* view, elfcpp::Elf_Xword value, | |
600 | elfcpp::Elf_Xword addend, | |
601 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
602 | { This::template pcrela<64>(view, value, addend, address); } | |
603 | ||
604 | static inline void | |
605 | pcrela64(unsigned char* view, | |
606 | const Sized_relobj<size, big_endian>* object, | |
607 | const Symbol_value<size>* psymval, | |
608 | elfcpp::Elf_Xword addend, | |
609 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
610 | { This::template pcrela<64>(view, object, psymval, addend, address); } | |
5a6f7e2d ILT |
611 | }; |
612 | ||
613 | // We try to avoid COPY relocations when possible. A COPY relocation | |
614 | // may be required when an executable refers to a variable defined in | |
615 | // a shared library. COPY relocations are problematic because they | |
616 | // tie the executable to the exact size of the variable in the shared | |
617 | // library. We can avoid them if all the references to the variable | |
618 | // are in a writeable section. In that case we can simply use dynamic | |
619 | // relocations. However, when scanning relocs, we don't know when we | |
620 | // see the relocation whether we will be forced to use a COPY | |
621 | // relocation or not. So we have to save the relocation during the | |
622 | // reloc scanning, and then emit it as a dynamic relocation if | |
623 | // necessary. This class implements that. It is used by the target | |
624 | // specific code. | |
625 | ||
626 | template<int size, bool big_endian> | |
627 | class Copy_relocs | |
628 | { | |
629 | public: | |
630 | Copy_relocs() | |
631 | : entries_() | |
632 | { } | |
a3ad94ed ILT |
633 | |
634 | // Return whether we need a COPY reloc for a reloc against GSYM, | |
635 | // which is being applied to section SHNDX in OBJECT. | |
636 | static bool | |
637 | need_copy_reloc(const General_options*, Relobj* object, unsigned int shndx, | |
5a6f7e2d ILT |
638 | Sized_symbol<size>* gsym); |
639 | ||
640 | // Save a Rel against SYM for possible emission later. SHNDX is the | |
641 | // index of the section to which the reloc is being applied. | |
642 | void | |
643 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
4f4c5f80 | 644 | Output_section* output_section, const elfcpp::Rel<size, big_endian>&); |
5a6f7e2d ILT |
645 | |
646 | // Save a Rela against SYM for possible emission later. | |
647 | void | |
648 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
4f4c5f80 | 649 | Output_section* output_section, const elfcpp::Rela<size, big_endian>&); |
5a6f7e2d ILT |
650 | |
651 | // Return whether there are any relocs to emit. This also discards | |
652 | // entries which need not be emitted. | |
653 | bool | |
654 | any_to_emit(); | |
655 | ||
656 | // Emit relocs for each symbol which did not get a COPY reloc (i.e., | |
657 | // is still defined in the dynamic object). | |
658 | template<int sh_type> | |
659 | void | |
660 | emit(Output_data_reloc<sh_type, true, size, big_endian>*); | |
661 | ||
662 | private: | |
663 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
664 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; | |
665 | ||
666 | // This POD class holds the entries we are saving. | |
667 | class Copy_reloc_entry | |
668 | { | |
669 | public: | |
670 | Copy_reloc_entry(Symbol* sym, unsigned int reloc_type, | |
671 | Relobj* relobj, unsigned int shndx, | |
4f4c5f80 | 672 | Output_section* output_section, |
5a6f7e2d ILT |
673 | Address address, Addend addend) |
674 | : sym_(sym), reloc_type_(reloc_type), relobj_(relobj), | |
4f4c5f80 ILT |
675 | shndx_(shndx), output_section_(output_section), |
676 | address_(address), addend_(addend) | |
5a6f7e2d ILT |
677 | { } |
678 | ||
679 | // Return whether we should emit this reloc. If we should not | |
680 | // emit, we clear it. | |
681 | bool | |
682 | should_emit(); | |
683 | ||
684 | // Emit this reloc. | |
685 | ||
686 | void | |
687 | emit(Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian>*); | |
688 | ||
689 | void | |
690 | emit(Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*); | |
691 | ||
692 | private: | |
693 | Symbol* sym_; | |
694 | unsigned int reloc_type_; | |
695 | Relobj* relobj_; | |
696 | unsigned int shndx_; | |
4f4c5f80 | 697 | Output_section* output_section_; |
5a6f7e2d ILT |
698 | Address address_; |
699 | Addend addend_; | |
700 | }; | |
701 | ||
702 | // A list of relocs to be saved. | |
703 | typedef std::vector<Copy_reloc_entry> Copy_reloc_entries; | |
704 | ||
705 | // The list of relocs we are saving. | |
706 | Copy_reloc_entries entries_; | |
92e059d8 ILT |
707 | }; |
708 | ||
730cdc88 ILT |
709 | // Track relocations while reading a section. This lets you ask for |
710 | // the relocation at a certain offset, and see how relocs occur | |
711 | // between points of interest. | |
712 | ||
713 | template<int size, bool big_endian> | |
714 | class Track_relocs | |
715 | { | |
716 | public: | |
717 | Track_relocs() | |
b696e6d4 | 718 | : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0) |
730cdc88 ILT |
719 | { } |
720 | ||
721 | // Initialize the Track_relocs object. OBJECT is the object holding | |
722 | // the reloc section, RELOC_SHNDX is the section index of the reloc | |
723 | // section, and RELOC_TYPE is the type of the reloc section | |
724 | // (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if | |
725 | // something went wrong. | |
726 | bool | |
b696e6d4 | 727 | initialize(Object* object, unsigned int reloc_shndx, |
730cdc88 ILT |
728 | unsigned int reloc_type); |
729 | ||
730 | // Return the offset in the data section to which the next reloc | |
731 | // applies. THis returns -1 if there is no next reloc. | |
732 | off_t | |
733 | next_offset() const; | |
734 | ||
735 | // Return the symbol index of the next reloc. This returns -1U if | |
736 | // there is no next reloc. | |
737 | unsigned int | |
738 | next_symndx() const; | |
739 | ||
740 | // Advance to OFFSET within the data section, and return the number | |
741 | // of relocs which would be skipped. | |
742 | int | |
743 | advance(off_t offset); | |
744 | ||
745 | private: | |
b696e6d4 | 746 | // The contents of the input object's reloc section. |
730cdc88 ILT |
747 | const unsigned char* prelocs_; |
748 | // The length of the reloc section. | |
8383303e | 749 | section_size_type len_; |
730cdc88 | 750 | // Our current position in the reloc section. |
8383303e | 751 | section_size_type pos_; |
730cdc88 ILT |
752 | // The size of the relocs in the section. |
753 | int reloc_size_; | |
754 | }; | |
755 | ||
61ba1cf9 ILT |
756 | } // End namespace gold. |
757 | ||
758 | #endif // !defined(GOLD_RELOC_H) |