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