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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 | ||
61ba1cf9 ILT |
28 | #include "workqueue.h" |
29 | ||
30 | namespace gold | |
31 | { | |
32 | ||
a3ad94ed | 33 | class General_options; |
f6ce93d6 | 34 | class Relobj; |
92e059d8 | 35 | class Read_relocs_data; |
a3ad94ed | 36 | class Symbol; |
ead1e424 | 37 | class Layout; |
92e059d8 | 38 | |
5a6f7e2d ILT |
39 | template<int size> |
40 | class Sized_symbol; | |
41 | ||
b8e6aad9 ILT |
42 | template<int size, bool big_endian> |
43 | class Sized_relobj; | |
44 | ||
45 | template<int size> | |
46 | class Symbol_value; | |
47 | ||
5a6f7e2d ILT |
48 | template<int sh_type, bool dynamic, int size, bool big_endian> |
49 | class Output_data_reloc; | |
50 | ||
92e059d8 ILT |
51 | // A class to read the relocations for an object file, and then queue |
52 | // up a task to see if they require any GOT/PLT/COPY relocations in | |
53 | // the symbol table. | |
54 | ||
55 | class Read_relocs : public Task | |
56 | { | |
57 | public: | |
58 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
59 | // unblocked when the Scan_relocs task completes. | |
60 | Read_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 61 | Layout* layout, Relobj* object, Task_token* symtab_lock, |
92e059d8 | 62 | Task_token* blocker) |
ead1e424 | 63 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
92e059d8 ILT |
64 | symtab_lock_(symtab_lock), blocker_(blocker) |
65 | { } | |
66 | ||
67 | // The standard Task methods. | |
68 | ||
69 | Is_runnable_type | |
70 | is_runnable(Workqueue*); | |
71 | ||
72 | Task_locker* | |
73 | locks(Workqueue*); | |
74 | ||
75 | void | |
76 | run(Workqueue*); | |
77 | ||
78 | private: | |
79 | const General_options& options_; | |
80 | Symbol_table* symtab_; | |
ead1e424 | 81 | Layout* layout_; |
f6ce93d6 | 82 | Relobj* object_; |
92e059d8 ILT |
83 | Task_token* symtab_lock_; |
84 | Task_token* blocker_; | |
85 | }; | |
86 | ||
87 | // Scan the relocations for an object to see if they require any | |
88 | // GOT/PLT/COPY relocations. | |
89 | ||
90 | class Scan_relocs : public Task | |
91 | { | |
92 | public: | |
93 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
94 | // unblocked when the task completes. | |
95 | Scan_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 96 | Layout* layout, Relobj* object, Read_relocs_data* rd, |
ead1e424 ILT |
97 | Task_token* symtab_lock, Task_token* blocker) |
98 | : options_(options), symtab_(symtab), layout_(layout), object_(object), | |
99 | rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker) | |
92e059d8 ILT |
100 | { } |
101 | ||
102 | // The standard Task methods. | |
103 | ||
104 | Is_runnable_type | |
105 | is_runnable(Workqueue*); | |
106 | ||
107 | Task_locker* | |
108 | locks(Workqueue*); | |
109 | ||
110 | void | |
111 | run(Workqueue*); | |
112 | ||
113 | private: | |
114 | class Scan_relocs_locker; | |
115 | ||
116 | const General_options& options_; | |
117 | Symbol_table* symtab_; | |
ead1e424 | 118 | Layout* layout_; |
f6ce93d6 | 119 | Relobj* object_; |
92e059d8 ILT |
120 | Read_relocs_data* rd_; |
121 | Task_token* symtab_lock_; | |
122 | Task_token* blocker_; | |
123 | }; | |
124 | ||
125 | // A class to perform all the relocations for an object file. | |
126 | ||
61ba1cf9 ILT |
127 | class Relocate_task : public Task |
128 | { | |
129 | public: | |
130 | Relocate_task(const General_options& options, const Symbol_table* symtab, | |
f6ce93d6 | 131 | const Layout* layout, Relobj* object, Output_file* of, |
61ba1cf9 | 132 | Task_token* final_blocker) |
92e059d8 | 133 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
61ba1cf9 ILT |
134 | of_(of), final_blocker_(final_blocker) |
135 | { } | |
136 | ||
137 | // The standard Task methods. | |
138 | ||
139 | Is_runnable_type | |
140 | is_runnable(Workqueue*); | |
141 | ||
142 | Task_locker* | |
143 | locks(Workqueue*); | |
144 | ||
145 | void | |
146 | run(Workqueue*); | |
147 | ||
148 | private: | |
149 | class Relocate_locker; | |
150 | ||
151 | const General_options& options_; | |
152 | const Symbol_table* symtab_; | |
92e059d8 | 153 | const Layout* layout_; |
f6ce93d6 | 154 | Relobj* object_; |
61ba1cf9 ILT |
155 | Output_file* of_; |
156 | Task_token* final_blocker_; | |
157 | }; | |
158 | ||
92e059d8 ILT |
159 | // Standard relocation routines which are used on many targets. Here |
160 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
161 | ||
162 | template<int size, bool big_endian> | |
163 | class Relocate_functions | |
164 | { | |
165 | private: | |
166 | // Do a simple relocation with the addend in the section contents. | |
167 | // VALSIZE is the size of the value. | |
168 | template<int valsize> | |
169 | static inline void | |
f6ce93d6 ILT |
170 | rel(unsigned char* view, |
171 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
92e059d8 | 172 | { |
f6ce93d6 | 173 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 174 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
175 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
176 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value); | |
92e059d8 ILT |
177 | } |
178 | ||
b8e6aad9 ILT |
179 | // Do a simple relocation using a Symbol_value with the addend in |
180 | // the section contents. VALSIZE is the size of the value to | |
181 | // relocate. | |
182 | template<int valsize> | |
183 | static inline void | |
184 | rel(unsigned char* view, | |
185 | const Sized_relobj<size, big_endian>* object, | |
186 | const Symbol_value<size>* psymval) | |
187 | { | |
188 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
189 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
190 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
191 | x = psymval->value(object, x); | |
192 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
193 | } | |
194 | ||
d830e0e0 ILT |
195 | // Do a simple relocation with the addend in the relocation. |
196 | // VALSIZE is the size of the value. | |
197 | template<int valsize> | |
198 | static inline void | |
199 | rela(unsigned char* view, | |
200 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
201 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
202 | { | |
203 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
204 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
205 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend); | |
206 | } | |
207 | ||
208 | // Do a simple relocation using a symbol value with the addend in | |
209 | // the relocation. VALSIZE is the size of the value. | |
210 | template<int valsize> | |
211 | static inline void | |
212 | rela(unsigned char* view, | |
213 | const Sized_relobj<size, big_endian>* object, | |
214 | const Symbol_value<size>* psymval, | |
215 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
216 | { | |
217 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
218 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
219 | Valtype x = psymval->value(object, addend); | |
220 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
221 | } | |
222 | ||
dfbba8f4 ILT |
223 | // Like rel(), but sign-extends the value to SIZE. |
224 | template<int valsize> | |
225 | static inline void | |
226 | signedrel(unsigned char* view, | |
227 | const Sized_relobj<size, big_endian>* object, | |
228 | const Symbol_value<size>* psymval) | |
229 | { | |
230 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
231 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Sizetype; | |
232 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
233 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
234 | // Fancy formula to sign-extend x to size. | |
235 | const Sizetype mask = 1U << (sizeof(valsize) * 8 - 1); | |
236 | Sizetype sign_extended_x = x; | |
237 | sign_extended_x = (sign_extended_x ^ mask) - mask; | |
238 | x = psymval->value(object, sign_extended_x); | |
239 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
240 | } | |
241 | ||
92e059d8 ILT |
242 | // Do a simple PC relative relocation with the addend in the section |
243 | // contents. VALSIZE is the size of the value. | |
244 | template<int valsize> | |
245 | static inline void | |
f6ce93d6 ILT |
246 | pcrel(unsigned char* view, |
247 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
92e059d8 ILT |
248 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
249 | { | |
f6ce93d6 | 250 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 251 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
252 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
253 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
92e059d8 ILT |
254 | } |
255 | ||
b8e6aad9 ILT |
256 | // Do a simple PC relative relocation with a Symbol_value with the |
257 | // addend in the section contents. VALSIZE is the size of the | |
258 | // value. | |
259 | template<int valsize> | |
260 | static inline void | |
261 | pcrel(unsigned char* view, | |
262 | const Sized_relobj<size, big_endian>* object, | |
263 | const Symbol_value<size>* psymval, | |
264 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
265 | { | |
266 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
267 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
268 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
269 | x = psymval->value(object, x); | |
270 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
271 | } | |
272 | ||
d830e0e0 ILT |
273 | // Do a simple PC relative relocation with the addend in the |
274 | // relocation. VALSIZE is the size of the value. | |
275 | template<int valsize> | |
276 | static inline void | |
277 | pcrela(unsigned char* view, | |
278 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
279 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
280 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
281 | { | |
282 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
283 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
284 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address); | |
285 | } | |
286 | ||
287 | // Do a simple PC relative relocation with a Symbol_value with the | |
288 | // addend in the relocation. VALSIZE is the size of the value. | |
289 | template<int valsize> | |
290 | static inline void | |
291 | pcrela(unsigned char* view, | |
292 | const Sized_relobj<size, big_endian>* object, | |
293 | const Symbol_value<size>* psymval, | |
294 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
295 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
296 | { | |
297 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
298 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
299 | Valtype x = psymval->value(object, addend); | |
300 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
301 | } | |
302 | ||
92e059d8 ILT |
303 | typedef Relocate_functions<size, big_endian> This; |
304 | ||
305 | public: | |
b8e6aad9 ILT |
306 | // Do a simple 8-bit REL relocation with the addend in the section |
307 | // contents. | |
92e059d8 ILT |
308 | static inline void |
309 | rel8(unsigned char* view, unsigned char value) | |
b8e6aad9 ILT |
310 | { This::template rel<8>(view, value); } |
311 | ||
312 | static inline void | |
313 | rel8(unsigned char* view, | |
314 | const Sized_relobj<size, big_endian>* object, | |
315 | const Symbol_value<size>* psymval) | |
316 | { This::template rel<8>(view, object, psymval); } | |
92e059d8 | 317 | |
d830e0e0 ILT |
318 | // Do an 8-bit RELA relocation with the addend in the relocation. |
319 | static inline void | |
320 | rel8a(unsigned char* view, unsigned char value, unsigned char addend) | |
321 | { This::template rela<8>(view, value, addend); } | |
322 | ||
323 | static inline void | |
324 | rel8a(unsigned char* view, | |
325 | const Sized_relobj<size, big_endian>* object, | |
326 | const Symbol_value<size>* psymval, | |
327 | unsigned char addend) | |
328 | { This::template rela<8>(view, object, psymval, addend); } | |
329 | ||
dfbba8f4 ILT |
330 | // Do an 8-bit REL relocation, sign extending the addend to SIZE. |
331 | static inline void | |
332 | rel8s(unsigned char* view, | |
333 | const Sized_relobj<size, big_endian>* object, | |
334 | const Symbol_value<size>* psymval) | |
335 | { This::template signedrel<8>(view, object, psymval); } | |
336 | ||
92e059d8 | 337 | // Do a simple 8-bit PC relative relocation with the addend in the |
b8e6aad9 | 338 | // section contents. |
92e059d8 ILT |
339 | static inline void |
340 | pcrel8(unsigned char* view, unsigned char value, | |
341 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
342 | { This::template pcrel<8>(view, value, address); } |
343 | ||
344 | static inline void | |
345 | pcrel8(unsigned char* view, | |
346 | const Sized_relobj<size, big_endian>* object, | |
347 | const Symbol_value<size>* psymval, | |
348 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
349 | { This::template pcrel<8>(view, object, psymval, address); } | |
92e059d8 | 350 | |
d830e0e0 ILT |
351 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
352 | // the reloc. | |
353 | static inline void | |
354 | pcrela8(unsigned char* view, unsigned char value, unsigned char addend, | |
355 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
356 | { This::template pcrela<8>(view, value, addend, address); } | |
357 | ||
358 | static inline void | |
359 | pcrela8(unsigned char* view, | |
360 | const Sized_relobj<size, big_endian>* object, | |
361 | const Symbol_value<size>* psymval, | |
362 | unsigned char addend, | |
363 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
364 | { This::template pcrela<8>(view, object, psymval, addend, address); } | |
365 | ||
b8e6aad9 ILT |
366 | // Do a simple 16-bit REL relocation with the addend in the section |
367 | // contents. | |
92e059d8 ILT |
368 | static inline void |
369 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
b8e6aad9 ILT |
370 | { This::template rel<16>(view, value); } |
371 | ||
372 | static inline void | |
373 | rel16(unsigned char* view, | |
374 | const Sized_relobj<size, big_endian>* object, | |
375 | const Symbol_value<size>* psymval) | |
376 | { This::template rel<16>(view, object, psymval); } | |
92e059d8 | 377 | |
d830e0e0 ILT |
378 | // Do an 16-bit RELA relocation with the addend in the relocation. |
379 | static inline void | |
380 | rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend) | |
381 | { This::template rela<16>(view, value, addend); } | |
382 | ||
383 | static inline void | |
384 | rela16(unsigned char* view, | |
385 | const Sized_relobj<size, big_endian>* object, | |
386 | const Symbol_value<size>* psymval, | |
387 | elfcpp::Elf_Half addend) | |
388 | { This::template rela<16>(view, object, psymval, addend); } | |
389 | ||
dfbba8f4 ILT |
390 | // Do a 16-bit REL relocation, sign extending the addend to SIZE. |
391 | static inline void | |
392 | rel16s(unsigned char* view, | |
393 | const Sized_relobj<size, big_endian>* object, | |
394 | const Symbol_value<size>* psymval) | |
395 | { This::template signedrel<16>(view, object, psymval); } | |
396 | ||
d830e0e0 | 397 | // Do a simple 16-bit PC relative REL relocation with the addend in |
b8e6aad9 | 398 | // the section contents. |
92e059d8 | 399 | static inline void |
d830e0e0 | 400 | pcrel16(unsigned char* view, elfcpp::Elf_Half value, |
92e059d8 | 401 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
402 | { This::template pcrel<16>(view, value, address); } |
403 | ||
404 | static inline void | |
405 | pcrel16(unsigned char* view, | |
406 | const Sized_relobj<size, big_endian>* object, | |
407 | const Symbol_value<size>* psymval, | |
408 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
409 | { This::template pcrel<16>(view, object, psymval, address); } | |
92e059d8 | 410 | |
d830e0e0 ILT |
411 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
412 | // the reloc. | |
413 | static inline void | |
414 | pcrela16(unsigned char* view, elfcpp::Elf_Half value, | |
415 | elfcpp::Elf_Half addend, | |
416 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
417 | { This::template pcrela<16>(view, value, addend, address); } | |
418 | ||
419 | static inline void | |
420 | pcrela16(unsigned char* view, | |
421 | const Sized_relobj<size, big_endian>* object, | |
422 | const Symbol_value<size>* psymval, | |
423 | elfcpp::Elf_Half addend, | |
424 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
425 | { This::template pcrela<16>(view, object, psymval, addend, address); } | |
426 | ||
92e059d8 ILT |
427 | // Do a simple 32-bit REL relocation with the addend in the section |
428 | // contents. | |
429 | static inline void | |
430 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
b8e6aad9 ILT |
431 | { This::template rel<32>(view, value); } |
432 | ||
433 | static inline void | |
434 | rel32(unsigned char* view, | |
435 | const Sized_relobj<size, big_endian>* object, | |
436 | const Symbol_value<size>* psymval) | |
437 | { This::template rel<32>(view, object, psymval); } | |
92e059d8 | 438 | |
d830e0e0 ILT |
439 | // Do an 32-bit RELA relocation with the addend in the relocation. |
440 | static inline void | |
441 | rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend) | |
442 | { This::template rela<32>(view, value, addend); } | |
443 | ||
444 | static inline void | |
445 | rela32(unsigned char* view, | |
446 | const Sized_relobj<size, big_endian>* object, | |
447 | const Symbol_value<size>* psymval, | |
448 | elfcpp::Elf_Word addend) | |
449 | { This::template rela<32>(view, object, psymval, addend); } | |
450 | ||
dfbba8f4 ILT |
451 | // Do a 32-bit REL relocation, sign extending the addend to SIZE. |
452 | static inline void | |
453 | rel32s(unsigned char* view, | |
454 | const Sized_relobj<size, big_endian>* object, | |
455 | const Symbol_value<size>* psymval) | |
456 | { This::template signedrel<32>(view, object, psymval); } | |
457 | ||
92e059d8 ILT |
458 | // Do a simple 32-bit PC relative REL relocation with the addend in |
459 | // the section contents. | |
460 | static inline void | |
461 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
462 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
463 | { This::template pcrel<32>(view, value, address); } |
464 | ||
465 | static inline void | |
466 | pcrel32(unsigned char* view, | |
467 | const Sized_relobj<size, big_endian>* object, | |
468 | const Symbol_value<size>* psymval, | |
469 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
470 | { This::template pcrel<32>(view, object, psymval, address); } | |
92e059d8 | 471 | |
d830e0e0 ILT |
472 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
473 | // the relocation. | |
474 | static inline void | |
475 | pcrela32(unsigned char* view, elfcpp::Elf_Word value, | |
476 | elfcpp::Elf_Word addend, | |
477 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
478 | { This::template pcrela<32>(view, value, addend, address); } | |
479 | ||
480 | static inline void | |
481 | pcrela32(unsigned char* view, | |
482 | const Sized_relobj<size, big_endian>* object, | |
483 | const Symbol_value<size>* psymval, | |
484 | elfcpp::Elf_Word addend, | |
485 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
486 | { This::template pcrela<32>(view, object, psymval, addend, address); } | |
487 | ||
92e059d8 ILT |
488 | // Do a simple 64-bit REL relocation with the addend in the section |
489 | // contents. | |
490 | static inline void | |
f6ce93d6 | 491 | rel64(unsigned char* view, elfcpp::Elf_Xword value) |
b8e6aad9 ILT |
492 | { This::template rel<64>(view, value); } |
493 | ||
494 | static inline void | |
495 | rel64(unsigned char* view, | |
496 | const Sized_relobj<size, big_endian>* object, | |
497 | const Symbol_value<size>* psymval) | |
498 | { This::template rel<64>(view, object, psymval); } | |
92e059d8 | 499 | |
d830e0e0 ILT |
500 | // Do a 64-bit RELA relocation with the addend in the relocation. |
501 | static inline void | |
502 | rela64(unsigned char* view, elfcpp::Elf_Xword value, | |
503 | elfcpp::Elf_Xword addend) | |
504 | { This::template rela<64>(view, value, addend); } | |
505 | ||
506 | static inline void | |
507 | rela64(unsigned char* view, | |
508 | const Sized_relobj<size, big_endian>* object, | |
509 | const Symbol_value<size>* psymval, | |
510 | elfcpp::Elf_Xword addend) | |
511 | { This::template rela<64>(view, object, psymval, addend); } | |
512 | ||
92e059d8 ILT |
513 | // Do a simple 64-bit PC relative REL relocation with the addend in |
514 | // the section contents. | |
515 | static inline void | |
f6ce93d6 | 516 | pcrel64(unsigned char* view, elfcpp::Elf_Xword value, |
92e059d8 | 517 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
518 | { This::template pcrel<64>(view, value, address); } |
519 | ||
520 | static inline void | |
521 | pcrel64(unsigned char* view, | |
522 | const Sized_relobj<size, big_endian>* object, | |
523 | const Symbol_value<size>* psymval, | |
524 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
525 | { This::template pcrel<64>(view, object, psymval, address); } | |
d830e0e0 ILT |
526 | |
527 | // Do a simple 64-bit PC relative RELA relocation with the addend in | |
528 | // the relocation. | |
529 | static inline void | |
530 | pcrela64(unsigned char* view, elfcpp::Elf_Xword value, | |
531 | elfcpp::Elf_Xword addend, | |
532 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
533 | { This::template pcrela<64>(view, value, addend, address); } | |
534 | ||
535 | static inline void | |
536 | pcrela64(unsigned char* view, | |
537 | const Sized_relobj<size, big_endian>* object, | |
538 | const Symbol_value<size>* psymval, | |
539 | elfcpp::Elf_Xword addend, | |
540 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
541 | { This::template pcrela<64>(view, object, psymval, addend, address); } | |
5a6f7e2d ILT |
542 | }; |
543 | ||
544 | // We try to avoid COPY relocations when possible. A COPY relocation | |
545 | // may be required when an executable refers to a variable defined in | |
546 | // a shared library. COPY relocations are problematic because they | |
547 | // tie the executable to the exact size of the variable in the shared | |
548 | // library. We can avoid them if all the references to the variable | |
549 | // are in a writeable section. In that case we can simply use dynamic | |
550 | // relocations. However, when scanning relocs, we don't know when we | |
551 | // see the relocation whether we will be forced to use a COPY | |
552 | // relocation or not. So we have to save the relocation during the | |
553 | // reloc scanning, and then emit it as a dynamic relocation if | |
554 | // necessary. This class implements that. It is used by the target | |
555 | // specific code. | |
556 | ||
557 | template<int size, bool big_endian> | |
558 | class Copy_relocs | |
559 | { | |
560 | public: | |
561 | Copy_relocs() | |
562 | : entries_() | |
563 | { } | |
a3ad94ed ILT |
564 | |
565 | // Return whether we need a COPY reloc for a reloc against GSYM, | |
566 | // which is being applied to section SHNDX in OBJECT. | |
567 | static bool | |
568 | need_copy_reloc(const General_options*, Relobj* object, unsigned int shndx, | |
5a6f7e2d ILT |
569 | Sized_symbol<size>* gsym); |
570 | ||
571 | // Save a Rel against SYM for possible emission later. SHNDX is the | |
572 | // index of the section to which the reloc is being applied. | |
573 | void | |
574 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
575 | const elfcpp::Rel<size, big_endian>&); | |
576 | ||
577 | // Save a Rela against SYM for possible emission later. | |
578 | void | |
579 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
580 | const elfcpp::Rela<size, big_endian>&); | |
581 | ||
582 | // Return whether there are any relocs to emit. This also discards | |
583 | // entries which need not be emitted. | |
584 | bool | |
585 | any_to_emit(); | |
586 | ||
587 | // Emit relocs for each symbol which did not get a COPY reloc (i.e., | |
588 | // is still defined in the dynamic object). | |
589 | template<int sh_type> | |
590 | void | |
591 | emit(Output_data_reloc<sh_type, true, size, big_endian>*); | |
592 | ||
593 | private: | |
594 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
595 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; | |
596 | ||
597 | // This POD class holds the entries we are saving. | |
598 | class Copy_reloc_entry | |
599 | { | |
600 | public: | |
601 | Copy_reloc_entry(Symbol* sym, unsigned int reloc_type, | |
602 | Relobj* relobj, unsigned int shndx, | |
603 | Address address, Addend addend) | |
604 | : sym_(sym), reloc_type_(reloc_type), relobj_(relobj), | |
605 | shndx_(shndx), address_(address), addend_(addend) | |
606 | { } | |
607 | ||
608 | // Return whether we should emit this reloc. If we should not | |
609 | // emit, we clear it. | |
610 | bool | |
611 | should_emit(); | |
612 | ||
613 | // Emit this reloc. | |
614 | ||
615 | void | |
616 | emit(Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian>*); | |
617 | ||
618 | void | |
619 | emit(Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*); | |
620 | ||
621 | private: | |
622 | Symbol* sym_; | |
623 | unsigned int reloc_type_; | |
624 | Relobj* relobj_; | |
625 | unsigned int shndx_; | |
626 | Address address_; | |
627 | Addend addend_; | |
628 | }; | |
629 | ||
630 | // A list of relocs to be saved. | |
631 | typedef std::vector<Copy_reloc_entry> Copy_reloc_entries; | |
632 | ||
633 | // The list of relocs we are saving. | |
634 | Copy_reloc_entries entries_; | |
92e059d8 ILT |
635 | }; |
636 | ||
61ba1cf9 ILT |
637 | } // End namespace gold. |
638 | ||
639 | #endif // !defined(GOLD_RELOC_H) |