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