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