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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 | ||
81 | private: | |
82 | const General_options& options_; | |
83 | Symbol_table* symtab_; | |
ead1e424 | 84 | Layout* layout_; |
f6ce93d6 | 85 | Relobj* object_; |
92e059d8 ILT |
86 | Task_token* symtab_lock_; |
87 | Task_token* blocker_; | |
88 | }; | |
89 | ||
90 | // Scan the relocations for an object to see if they require any | |
91 | // GOT/PLT/COPY relocations. | |
92 | ||
93 | class Scan_relocs : public Task | |
94 | { | |
95 | public: | |
96 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
97 | // unblocked when the task completes. | |
98 | Scan_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 99 | Layout* layout, Relobj* object, Read_relocs_data* rd, |
ead1e424 ILT |
100 | Task_token* symtab_lock, Task_token* blocker) |
101 | : options_(options), symtab_(symtab), layout_(layout), object_(object), | |
102 | rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker) | |
92e059d8 ILT |
103 | { } |
104 | ||
105 | // The standard Task methods. | |
106 | ||
107 | Is_runnable_type | |
108 | is_runnable(Workqueue*); | |
109 | ||
110 | Task_locker* | |
111 | locks(Workqueue*); | |
112 | ||
113 | void | |
114 | run(Workqueue*); | |
115 | ||
116 | private: | |
117 | class Scan_relocs_locker; | |
118 | ||
119 | const General_options& options_; | |
120 | Symbol_table* symtab_; | |
ead1e424 | 121 | Layout* layout_; |
f6ce93d6 | 122 | Relobj* object_; |
92e059d8 ILT |
123 | Read_relocs_data* rd_; |
124 | Task_token* symtab_lock_; | |
125 | Task_token* blocker_; | |
126 | }; | |
127 | ||
128 | // A class to perform all the relocations for an object file. | |
129 | ||
61ba1cf9 ILT |
130 | class Relocate_task : public Task |
131 | { | |
132 | public: | |
133 | Relocate_task(const General_options& options, const Symbol_table* symtab, | |
f6ce93d6 | 134 | const Layout* layout, Relobj* object, Output_file* of, |
730cdc88 ILT |
135 | Task_token* input_sections_blocker, |
136 | Task_token* output_sections_blocker, Task_token* final_blocker) | |
92e059d8 | 137 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
730cdc88 ILT |
138 | of_(of), input_sections_blocker_(input_sections_blocker), |
139 | output_sections_blocker_(output_sections_blocker), | |
140 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
141 | { } |
142 | ||
143 | // The standard Task methods. | |
144 | ||
145 | Is_runnable_type | |
146 | is_runnable(Workqueue*); | |
147 | ||
148 | Task_locker* | |
149 | locks(Workqueue*); | |
150 | ||
151 | void | |
152 | run(Workqueue*); | |
153 | ||
154 | private: | |
155 | class Relocate_locker; | |
156 | ||
157 | const General_options& options_; | |
158 | const Symbol_table* symtab_; | |
92e059d8 | 159 | const Layout* layout_; |
f6ce93d6 | 160 | Relobj* object_; |
61ba1cf9 | 161 | Output_file* of_; |
730cdc88 ILT |
162 | Task_token* input_sections_blocker_; |
163 | Task_token* output_sections_blocker_; | |
61ba1cf9 ILT |
164 | Task_token* final_blocker_; |
165 | }; | |
166 | ||
92e059d8 ILT |
167 | // Standard relocation routines which are used on many targets. Here |
168 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
169 | ||
170 | template<int size, bool big_endian> | |
171 | class Relocate_functions | |
172 | { | |
173 | private: | |
174 | // Do a simple relocation with the addend in the section contents. | |
175 | // VALSIZE is the size of the value. | |
176 | template<int valsize> | |
177 | static inline void | |
f6ce93d6 ILT |
178 | rel(unsigned char* view, |
179 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
92e059d8 | 180 | { |
f6ce93d6 | 181 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 182 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
183 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
184 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value); | |
92e059d8 ILT |
185 | } |
186 | ||
b8e6aad9 ILT |
187 | // Do a simple relocation using a Symbol_value with the addend in |
188 | // the section contents. VALSIZE is the size of the value to | |
189 | // relocate. | |
190 | template<int valsize> | |
191 | static inline void | |
192 | rel(unsigned char* view, | |
193 | const Sized_relobj<size, big_endian>* object, | |
194 | const Symbol_value<size>* psymval) | |
195 | { | |
196 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
197 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
198 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
199 | x = psymval->value(object, x); | |
200 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
201 | } | |
202 | ||
d830e0e0 ILT |
203 | // Do a simple relocation with the addend in the relocation. |
204 | // VALSIZE is the size of the value. | |
205 | template<int valsize> | |
206 | static inline void | |
207 | rela(unsigned char* view, | |
208 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
209 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
210 | { | |
211 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
212 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
213 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend); | |
214 | } | |
215 | ||
216 | // Do a simple relocation using a symbol value with the addend in | |
217 | // the relocation. VALSIZE is the size of the value. | |
218 | template<int valsize> | |
219 | static inline void | |
220 | rela(unsigned char* view, | |
221 | const Sized_relobj<size, big_endian>* object, | |
222 | const Symbol_value<size>* psymval, | |
223 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
224 | { | |
225 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
226 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
227 | Valtype x = psymval->value(object, addend); | |
228 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
229 | } | |
230 | ||
92e059d8 ILT |
231 | // Do a simple PC relative relocation with the addend in the section |
232 | // contents. VALSIZE is the size of the value. | |
233 | template<int valsize> | |
234 | static inline void | |
f6ce93d6 ILT |
235 | pcrel(unsigned char* view, |
236 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
92e059d8 ILT |
237 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
238 | { | |
f6ce93d6 | 239 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 240 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
241 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
242 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
92e059d8 ILT |
243 | } |
244 | ||
b8e6aad9 ILT |
245 | // Do a simple PC relative relocation with a Symbol_value with the |
246 | // addend in the section contents. VALSIZE is the size of the | |
247 | // value. | |
248 | template<int valsize> | |
249 | static inline void | |
250 | pcrel(unsigned char* view, | |
251 | const Sized_relobj<size, big_endian>* object, | |
252 | const Symbol_value<size>* psymval, | |
253 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
254 | { | |
255 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
256 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
257 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
258 | x = psymval->value(object, x); | |
259 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
260 | } | |
261 | ||
d830e0e0 ILT |
262 | // Do a simple PC relative relocation with the addend in the |
263 | // relocation. VALSIZE is the size of the value. | |
264 | template<int valsize> | |
265 | static inline void | |
266 | pcrela(unsigned char* view, | |
267 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
268 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
269 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
270 | { | |
271 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
272 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
273 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address); | |
274 | } | |
275 | ||
276 | // Do a simple PC relative relocation with a Symbol_value with the | |
277 | // addend in the relocation. VALSIZE is the size of the value. | |
278 | template<int valsize> | |
279 | static inline void | |
280 | pcrela(unsigned char* view, | |
281 | const Sized_relobj<size, big_endian>* object, | |
282 | const Symbol_value<size>* psymval, | |
283 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
284 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
285 | { | |
286 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
287 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
288 | Valtype x = psymval->value(object, addend); | |
289 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
290 | } | |
291 | ||
92e059d8 ILT |
292 | typedef Relocate_functions<size, big_endian> This; |
293 | ||
294 | public: | |
b8e6aad9 ILT |
295 | // Do a simple 8-bit REL relocation with the addend in the section |
296 | // contents. | |
92e059d8 ILT |
297 | static inline void |
298 | rel8(unsigned char* view, unsigned char value) | |
b8e6aad9 ILT |
299 | { This::template rel<8>(view, value); } |
300 | ||
301 | static inline void | |
302 | rel8(unsigned char* view, | |
303 | const Sized_relobj<size, big_endian>* object, | |
304 | const Symbol_value<size>* psymval) | |
305 | { This::template rel<8>(view, object, psymval); } | |
92e059d8 | 306 | |
d830e0e0 ILT |
307 | // Do an 8-bit RELA relocation with the addend in the relocation. |
308 | static inline void | |
5b3463d9 | 309 | rela8(unsigned char* view, unsigned char value, unsigned char addend) |
d830e0e0 ILT |
310 | { This::template rela<8>(view, value, addend); } |
311 | ||
312 | static inline void | |
5b3463d9 | 313 | rela8(unsigned char* view, |
d830e0e0 ILT |
314 | const Sized_relobj<size, big_endian>* object, |
315 | const Symbol_value<size>* psymval, | |
316 | unsigned char addend) | |
317 | { This::template rela<8>(view, object, psymval, addend); } | |
318 | ||
92e059d8 | 319 | // Do a simple 8-bit PC relative relocation with the addend in the |
b8e6aad9 | 320 | // section contents. |
92e059d8 ILT |
321 | static inline void |
322 | pcrel8(unsigned char* view, unsigned char value, | |
323 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
324 | { This::template pcrel<8>(view, value, address); } |
325 | ||
326 | static inline void | |
327 | pcrel8(unsigned char* view, | |
328 | const Sized_relobj<size, big_endian>* object, | |
329 | const Symbol_value<size>* psymval, | |
330 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
331 | { This::template pcrel<8>(view, object, psymval, address); } | |
92e059d8 | 332 | |
d830e0e0 ILT |
333 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
334 | // the reloc. | |
335 | static inline void | |
336 | pcrela8(unsigned char* view, unsigned char value, unsigned char addend, | |
337 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
338 | { This::template pcrela<8>(view, value, addend, address); } | |
339 | ||
340 | static inline void | |
341 | pcrela8(unsigned char* view, | |
342 | const Sized_relobj<size, big_endian>* object, | |
343 | const Symbol_value<size>* psymval, | |
344 | unsigned char addend, | |
345 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
346 | { This::template pcrela<8>(view, object, psymval, addend, address); } | |
347 | ||
b8e6aad9 ILT |
348 | // Do a simple 16-bit REL relocation with the addend in the section |
349 | // contents. | |
92e059d8 ILT |
350 | static inline void |
351 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
b8e6aad9 ILT |
352 | { This::template rel<16>(view, value); } |
353 | ||
354 | static inline void | |
355 | rel16(unsigned char* view, | |
356 | const Sized_relobj<size, big_endian>* object, | |
357 | const Symbol_value<size>* psymval) | |
358 | { This::template rel<16>(view, object, psymval); } | |
92e059d8 | 359 | |
d830e0e0 ILT |
360 | // Do an 16-bit RELA relocation with the addend in the relocation. |
361 | static inline void | |
362 | rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend) | |
363 | { This::template rela<16>(view, value, addend); } | |
364 | ||
365 | static inline void | |
366 | rela16(unsigned char* view, | |
367 | const Sized_relobj<size, big_endian>* object, | |
368 | const Symbol_value<size>* psymval, | |
369 | elfcpp::Elf_Half addend) | |
370 | { This::template rela<16>(view, object, psymval, addend); } | |
371 | ||
d830e0e0 | 372 | // Do a simple 16-bit PC relative REL relocation with the addend in |
b8e6aad9 | 373 | // the section contents. |
92e059d8 | 374 | static inline void |
d830e0e0 | 375 | pcrel16(unsigned char* view, elfcpp::Elf_Half value, |
92e059d8 | 376 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
377 | { This::template pcrel<16>(view, value, address); } |
378 | ||
379 | static inline void | |
380 | pcrel16(unsigned char* view, | |
381 | const Sized_relobj<size, big_endian>* object, | |
382 | const Symbol_value<size>* psymval, | |
383 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
384 | { This::template pcrel<16>(view, object, psymval, address); } | |
92e059d8 | 385 | |
d830e0e0 ILT |
386 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
387 | // the reloc. | |
388 | static inline void | |
389 | pcrela16(unsigned char* view, elfcpp::Elf_Half value, | |
390 | elfcpp::Elf_Half addend, | |
391 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
392 | { This::template pcrela<16>(view, value, addend, address); } | |
393 | ||
394 | static inline void | |
395 | pcrela16(unsigned char* view, | |
396 | const Sized_relobj<size, big_endian>* object, | |
397 | const Symbol_value<size>* psymval, | |
398 | elfcpp::Elf_Half addend, | |
399 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
400 | { This::template pcrela<16>(view, object, psymval, addend, address); } | |
401 | ||
92e059d8 ILT |
402 | // Do a simple 32-bit REL relocation with the addend in the section |
403 | // contents. | |
404 | static inline void | |
405 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
b8e6aad9 ILT |
406 | { This::template rel<32>(view, value); } |
407 | ||
408 | static inline void | |
409 | rel32(unsigned char* view, | |
410 | const Sized_relobj<size, big_endian>* object, | |
411 | const Symbol_value<size>* psymval) | |
412 | { This::template rel<32>(view, object, psymval); } | |
92e059d8 | 413 | |
d830e0e0 ILT |
414 | // Do an 32-bit RELA relocation with the addend in the relocation. |
415 | static inline void | |
416 | rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend) | |
417 | { This::template rela<32>(view, value, addend); } | |
418 | ||
419 | static inline void | |
420 | rela32(unsigned char* view, | |
421 | const Sized_relobj<size, big_endian>* object, | |
422 | const Symbol_value<size>* psymval, | |
423 | elfcpp::Elf_Word addend) | |
424 | { This::template rela<32>(view, object, psymval, addend); } | |
425 | ||
92e059d8 ILT |
426 | // Do a simple 32-bit PC relative REL relocation with the addend in |
427 | // the section contents. | |
428 | static inline void | |
429 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
430 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
431 | { This::template pcrel<32>(view, value, address); } |
432 | ||
433 | static inline void | |
434 | pcrel32(unsigned char* view, | |
435 | const Sized_relobj<size, big_endian>* object, | |
436 | const Symbol_value<size>* psymval, | |
437 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
438 | { This::template pcrel<32>(view, object, psymval, address); } | |
92e059d8 | 439 | |
d830e0e0 ILT |
440 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
441 | // the relocation. | |
442 | static inline void | |
443 | pcrela32(unsigned char* view, elfcpp::Elf_Word value, | |
444 | elfcpp::Elf_Word addend, | |
445 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
446 | { This::template pcrela<32>(view, value, addend, address); } | |
447 | ||
448 | static inline void | |
449 | pcrela32(unsigned char* view, | |
450 | const Sized_relobj<size, big_endian>* object, | |
451 | const Symbol_value<size>* psymval, | |
452 | elfcpp::Elf_Word addend, | |
453 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
454 | { This::template pcrela<32>(view, object, psymval, addend, address); } | |
455 | ||
92e059d8 ILT |
456 | // Do a simple 64-bit REL relocation with the addend in the section |
457 | // contents. | |
458 | static inline void | |
f6ce93d6 | 459 | rel64(unsigned char* view, elfcpp::Elf_Xword value) |
b8e6aad9 ILT |
460 | { This::template rel<64>(view, value); } |
461 | ||
462 | static inline void | |
463 | rel64(unsigned char* view, | |
464 | const Sized_relobj<size, big_endian>* object, | |
465 | const Symbol_value<size>* psymval) | |
466 | { This::template rel<64>(view, object, psymval); } | |
92e059d8 | 467 | |
d830e0e0 ILT |
468 | // Do a 64-bit RELA relocation with the addend in the relocation. |
469 | static inline void | |
470 | rela64(unsigned char* view, elfcpp::Elf_Xword value, | |
471 | elfcpp::Elf_Xword addend) | |
472 | { This::template rela<64>(view, value, addend); } | |
473 | ||
474 | static inline void | |
475 | rela64(unsigned char* view, | |
476 | const Sized_relobj<size, big_endian>* object, | |
477 | const Symbol_value<size>* psymval, | |
478 | elfcpp::Elf_Xword addend) | |
479 | { This::template rela<64>(view, object, psymval, addend); } | |
480 | ||
92e059d8 ILT |
481 | // Do a simple 64-bit PC relative REL relocation with the addend in |
482 | // the section contents. | |
483 | static inline void | |
f6ce93d6 | 484 | pcrel64(unsigned char* view, elfcpp::Elf_Xword value, |
92e059d8 | 485 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
486 | { This::template pcrel<64>(view, value, address); } |
487 | ||
488 | static inline void | |
489 | pcrel64(unsigned char* view, | |
490 | const Sized_relobj<size, big_endian>* object, | |
491 | const Symbol_value<size>* psymval, | |
492 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
493 | { This::template pcrel<64>(view, object, psymval, address); } | |
d830e0e0 ILT |
494 | |
495 | // Do a simple 64-bit PC relative RELA relocation with the addend in | |
496 | // the relocation. | |
497 | static inline void | |
498 | pcrela64(unsigned char* view, elfcpp::Elf_Xword value, | |
499 | elfcpp::Elf_Xword addend, | |
500 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
501 | { This::template pcrela<64>(view, value, addend, address); } | |
502 | ||
503 | static inline void | |
504 | pcrela64(unsigned char* view, | |
505 | const Sized_relobj<size, big_endian>* object, | |
506 | const Symbol_value<size>* psymval, | |
507 | elfcpp::Elf_Xword addend, | |
508 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
509 | { This::template pcrela<64>(view, object, psymval, addend, address); } | |
5a6f7e2d ILT |
510 | }; |
511 | ||
512 | // We try to avoid COPY relocations when possible. A COPY relocation | |
513 | // may be required when an executable refers to a variable defined in | |
514 | // a shared library. COPY relocations are problematic because they | |
515 | // tie the executable to the exact size of the variable in the shared | |
516 | // library. We can avoid them if all the references to the variable | |
517 | // are in a writeable section. In that case we can simply use dynamic | |
518 | // relocations. However, when scanning relocs, we don't know when we | |
519 | // see the relocation whether we will be forced to use a COPY | |
520 | // relocation or not. So we have to save the relocation during the | |
521 | // reloc scanning, and then emit it as a dynamic relocation if | |
522 | // necessary. This class implements that. It is used by the target | |
523 | // specific code. | |
524 | ||
525 | template<int size, bool big_endian> | |
526 | class Copy_relocs | |
527 | { | |
528 | public: | |
529 | Copy_relocs() | |
530 | : entries_() | |
531 | { } | |
a3ad94ed ILT |
532 | |
533 | // Return whether we need a COPY reloc for a reloc against GSYM, | |
534 | // which is being applied to section SHNDX in OBJECT. | |
535 | static bool | |
536 | need_copy_reloc(const General_options*, Relobj* object, unsigned int shndx, | |
5a6f7e2d ILT |
537 | Sized_symbol<size>* gsym); |
538 | ||
539 | // Save a Rel against SYM for possible emission later. SHNDX is the | |
540 | // index of the section to which the reloc is being applied. | |
541 | void | |
542 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
4f4c5f80 | 543 | Output_section* output_section, const elfcpp::Rel<size, big_endian>&); |
5a6f7e2d ILT |
544 | |
545 | // Save a Rela against SYM for possible emission later. | |
546 | void | |
547 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
4f4c5f80 | 548 | Output_section* output_section, const elfcpp::Rela<size, big_endian>&); |
5a6f7e2d ILT |
549 | |
550 | // Return whether there are any relocs to emit. This also discards | |
551 | // entries which need not be emitted. | |
552 | bool | |
553 | any_to_emit(); | |
554 | ||
555 | // Emit relocs for each symbol which did not get a COPY reloc (i.e., | |
556 | // is still defined in the dynamic object). | |
557 | template<int sh_type> | |
558 | void | |
559 | emit(Output_data_reloc<sh_type, true, size, big_endian>*); | |
560 | ||
561 | private: | |
562 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
563 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; | |
564 | ||
565 | // This POD class holds the entries we are saving. | |
566 | class Copy_reloc_entry | |
567 | { | |
568 | public: | |
569 | Copy_reloc_entry(Symbol* sym, unsigned int reloc_type, | |
570 | Relobj* relobj, unsigned int shndx, | |
4f4c5f80 | 571 | Output_section* output_section, |
5a6f7e2d ILT |
572 | Address address, Addend addend) |
573 | : sym_(sym), reloc_type_(reloc_type), relobj_(relobj), | |
4f4c5f80 ILT |
574 | shndx_(shndx), output_section_(output_section), |
575 | address_(address), addend_(addend) | |
5a6f7e2d ILT |
576 | { } |
577 | ||
578 | // Return whether we should emit this reloc. If we should not | |
579 | // emit, we clear it. | |
580 | bool | |
581 | should_emit(); | |
582 | ||
583 | // Emit this reloc. | |
584 | ||
585 | void | |
586 | emit(Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian>*); | |
587 | ||
588 | void | |
589 | emit(Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*); | |
590 | ||
591 | private: | |
592 | Symbol* sym_; | |
593 | unsigned int reloc_type_; | |
594 | Relobj* relobj_; | |
595 | unsigned int shndx_; | |
4f4c5f80 | 596 | Output_section* output_section_; |
5a6f7e2d ILT |
597 | Address address_; |
598 | Addend addend_; | |
599 | }; | |
600 | ||
601 | // A list of relocs to be saved. | |
602 | typedef std::vector<Copy_reloc_entry> Copy_reloc_entries; | |
603 | ||
604 | // The list of relocs we are saving. | |
605 | Copy_reloc_entries entries_; | |
92e059d8 ILT |
606 | }; |
607 | ||
730cdc88 ILT |
608 | // Track relocations while reading a section. This lets you ask for |
609 | // the relocation at a certain offset, and see how relocs occur | |
610 | // between points of interest. | |
611 | ||
612 | template<int size, bool big_endian> | |
613 | class Track_relocs | |
614 | { | |
615 | public: | |
616 | Track_relocs() | |
b696e6d4 | 617 | : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0) |
730cdc88 ILT |
618 | { } |
619 | ||
620 | // Initialize the Track_relocs object. OBJECT is the object holding | |
621 | // the reloc section, RELOC_SHNDX is the section index of the reloc | |
622 | // section, and RELOC_TYPE is the type of the reloc section | |
623 | // (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if | |
624 | // something went wrong. | |
625 | bool | |
b696e6d4 | 626 | initialize(Object* object, unsigned int reloc_shndx, |
730cdc88 ILT |
627 | unsigned int reloc_type); |
628 | ||
629 | // Return the offset in the data section to which the next reloc | |
630 | // applies. THis returns -1 if there is no next reloc. | |
631 | off_t | |
632 | next_offset() const; | |
633 | ||
634 | // Return the symbol index of the next reloc. This returns -1U if | |
635 | // there is no next reloc. | |
636 | unsigned int | |
637 | next_symndx() const; | |
638 | ||
639 | // Advance to OFFSET within the data section, and return the number | |
640 | // of relocs which would be skipped. | |
641 | int | |
642 | advance(off_t offset); | |
643 | ||
644 | private: | |
b696e6d4 | 645 | // The contents of the input object's reloc section. |
730cdc88 ILT |
646 | const unsigned char* prelocs_; |
647 | // The length of the reloc section. | |
648 | off_t len_; | |
649 | // Our current position in the reloc section. | |
650 | off_t pos_; | |
651 | // The size of the relocs in the section. | |
652 | int reloc_size_; | |
653 | }; | |
654 | ||
61ba1cf9 ILT |
655 | } // End namespace gold. |
656 | ||
657 | #endif // !defined(GOLD_RELOC_H) |