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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 | ||
17a1d0a9 | 26 | #include <vector> |
92e059d8 ILT |
27 | #include <byteswap.h> |
28 | ||
4c50553d | 29 | #include "elfcpp.h" |
61ba1cf9 ILT |
30 | #include "workqueue.h" |
31 | ||
32 | namespace gold | |
33 | { | |
34 | ||
a3ad94ed | 35 | class General_options; |
b696e6d4 | 36 | class Object; |
f6ce93d6 | 37 | class Relobj; |
92e059d8 | 38 | class Read_relocs_data; |
a3ad94ed | 39 | class Symbol; |
ead1e424 | 40 | class Layout; |
4f4c5f80 | 41 | class Output_section; |
92e059d8 | 42 | |
5a6f7e2d ILT |
43 | template<int size> |
44 | class Sized_symbol; | |
45 | ||
b8e6aad9 ILT |
46 | template<int size, bool big_endian> |
47 | class Sized_relobj; | |
48 | ||
49 | template<int size> | |
50 | class Symbol_value; | |
51 | ||
5a6f7e2d ILT |
52 | template<int sh_type, bool dynamic, int size, bool big_endian> |
53 | class Output_data_reloc; | |
54 | ||
92e059d8 ILT |
55 | // A class to read the relocations for an object file, and then queue |
56 | // up a task to see if they require any GOT/PLT/COPY relocations in | |
57 | // the symbol table. | |
58 | ||
59 | class Read_relocs : public Task | |
60 | { | |
61 | public: | |
62 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
63 | // unblocked when the Scan_relocs task completes. | |
64 | Read_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 65 | Layout* layout, Relobj* object, Task_token* symtab_lock, |
92e059d8 | 66 | Task_token* blocker) |
ead1e424 | 67 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
92e059d8 ILT |
68 | symtab_lock_(symtab_lock), blocker_(blocker) |
69 | { } | |
70 | ||
71 | // The standard Task methods. | |
72 | ||
17a1d0a9 ILT |
73 | Task_token* |
74 | is_runnable(); | |
92e059d8 | 75 | |
17a1d0a9 ILT |
76 | void |
77 | locks(Task_locker*); | |
92e059d8 ILT |
78 | |
79 | void | |
80 | run(Workqueue*); | |
81 | ||
c7912668 ILT |
82 | std::string |
83 | get_name() const; | |
84 | ||
92e059d8 ILT |
85 | private: |
86 | const General_options& options_; | |
87 | Symbol_table* symtab_; | |
ead1e424 | 88 | Layout* layout_; |
f6ce93d6 | 89 | Relobj* object_; |
92e059d8 ILT |
90 | Task_token* symtab_lock_; |
91 | Task_token* blocker_; | |
92 | }; | |
93 | ||
94 | // Scan the relocations for an object to see if they require any | |
95 | // GOT/PLT/COPY relocations. | |
96 | ||
97 | class Scan_relocs : public Task | |
98 | { | |
99 | public: | |
100 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
101 | // unblocked when the task completes. | |
102 | Scan_relocs(const General_options& options, Symbol_table* symtab, | |
f6ce93d6 | 103 | Layout* layout, Relobj* object, Read_relocs_data* rd, |
ead1e424 ILT |
104 | Task_token* symtab_lock, Task_token* blocker) |
105 | : options_(options), symtab_(symtab), layout_(layout), object_(object), | |
106 | rd_(rd), symtab_lock_(symtab_lock), blocker_(blocker) | |
92e059d8 ILT |
107 | { } |
108 | ||
109 | // The standard Task methods. | |
110 | ||
17a1d0a9 ILT |
111 | Task_token* |
112 | is_runnable(); | |
92e059d8 | 113 | |
17a1d0a9 ILT |
114 | void |
115 | locks(Task_locker*); | |
92e059d8 ILT |
116 | |
117 | void | |
118 | run(Workqueue*); | |
119 | ||
c7912668 ILT |
120 | std::string |
121 | get_name() const; | |
122 | ||
92e059d8 | 123 | private: |
92e059d8 ILT |
124 | const General_options& options_; |
125 | Symbol_table* symtab_; | |
ead1e424 | 126 | Layout* layout_; |
f6ce93d6 | 127 | Relobj* object_; |
92e059d8 ILT |
128 | Read_relocs_data* rd_; |
129 | Task_token* symtab_lock_; | |
130 | Task_token* blocker_; | |
131 | }; | |
132 | ||
133 | // A class to perform all the relocations for an object file. | |
134 | ||
61ba1cf9 ILT |
135 | class Relocate_task : public Task |
136 | { | |
137 | public: | |
138 | Relocate_task(const General_options& options, const Symbol_table* symtab, | |
f6ce93d6 | 139 | const Layout* layout, Relobj* object, Output_file* of, |
730cdc88 ILT |
140 | Task_token* input_sections_blocker, |
141 | Task_token* output_sections_blocker, Task_token* final_blocker) | |
92e059d8 | 142 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
730cdc88 ILT |
143 | of_(of), input_sections_blocker_(input_sections_blocker), |
144 | output_sections_blocker_(output_sections_blocker), | |
145 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
146 | { } |
147 | ||
148 | // The standard Task methods. | |
149 | ||
17a1d0a9 ILT |
150 | Task_token* |
151 | is_runnable(); | |
61ba1cf9 | 152 | |
17a1d0a9 ILT |
153 | void |
154 | locks(Task_locker*); | |
61ba1cf9 ILT |
155 | |
156 | void | |
157 | run(Workqueue*); | |
158 | ||
c7912668 ILT |
159 | std::string |
160 | get_name() const; | |
161 | ||
61ba1cf9 | 162 | private: |
61ba1cf9 ILT |
163 | const General_options& options_; |
164 | const Symbol_table* symtab_; | |
92e059d8 | 165 | const Layout* layout_; |
f6ce93d6 | 166 | Relobj* object_; |
61ba1cf9 | 167 | Output_file* of_; |
730cdc88 ILT |
168 | Task_token* input_sections_blocker_; |
169 | Task_token* output_sections_blocker_; | |
61ba1cf9 ILT |
170 | Task_token* final_blocker_; |
171 | }; | |
172 | ||
92e059d8 ILT |
173 | // Standard relocation routines which are used on many targets. Here |
174 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
175 | ||
176 | template<int size, bool big_endian> | |
177 | class Relocate_functions | |
178 | { | |
179 | private: | |
180 | // Do a simple relocation with the addend in the section contents. | |
181 | // VALSIZE is the size of the value. | |
182 | template<int valsize> | |
183 | static inline void | |
f6ce93d6 ILT |
184 | rel(unsigned char* view, |
185 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
92e059d8 | 186 | { |
f6ce93d6 | 187 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 188 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
189 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
190 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value); | |
92e059d8 ILT |
191 | } |
192 | ||
b8e6aad9 ILT |
193 | // Do a simple relocation using a Symbol_value with the addend in |
194 | // the section contents. VALSIZE is the size of the value to | |
195 | // relocate. | |
196 | template<int valsize> | |
197 | static inline void | |
198 | rel(unsigned char* view, | |
199 | const Sized_relobj<size, big_endian>* object, | |
200 | const Symbol_value<size>* psymval) | |
201 | { | |
202 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
203 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
204 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
205 | x = psymval->value(object, x); | |
206 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
207 | } | |
208 | ||
d830e0e0 ILT |
209 | // Do a simple relocation with the addend in the relocation. |
210 | // VALSIZE is the size of the value. | |
211 | template<int valsize> | |
212 | static inline void | |
213 | rela(unsigned char* view, | |
214 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
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 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend); | |
220 | } | |
221 | ||
222 | // Do a simple relocation using a symbol value with the addend in | |
223 | // the relocation. VALSIZE is the size of the value. | |
224 | template<int valsize> | |
225 | static inline void | |
226 | rela(unsigned char* view, | |
227 | const Sized_relobj<size, big_endian>* object, | |
228 | const Symbol_value<size>* psymval, | |
229 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
230 | { | |
231 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
232 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
233 | Valtype x = psymval->value(object, addend); | |
234 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
235 | } | |
236 | ||
92e059d8 ILT |
237 | // Do a simple PC relative relocation with the addend in the section |
238 | // contents. VALSIZE is the size of the value. | |
239 | template<int valsize> | |
240 | static inline void | |
f6ce93d6 ILT |
241 | pcrel(unsigned char* view, |
242 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
92e059d8 ILT |
243 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
244 | { | |
f6ce93d6 | 245 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 246 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
247 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
248 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
92e059d8 ILT |
249 | } |
250 | ||
b8e6aad9 ILT |
251 | // Do a simple PC relative relocation with a Symbol_value with the |
252 | // addend in the section contents. VALSIZE is the size of the | |
253 | // value. | |
254 | template<int valsize> | |
255 | static inline void | |
256 | pcrel(unsigned char* view, | |
257 | const Sized_relobj<size, big_endian>* object, | |
258 | const Symbol_value<size>* psymval, | |
259 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
260 | { | |
261 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
262 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
263 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
264 | x = psymval->value(object, x); | |
265 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
266 | } | |
267 | ||
d830e0e0 ILT |
268 | // Do a simple PC relative relocation with the addend in the |
269 | // relocation. VALSIZE is the size of the value. | |
270 | template<int valsize> | |
271 | static inline void | |
272 | pcrela(unsigned char* view, | |
273 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
274 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
275 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
276 | { | |
277 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
278 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
279 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address); | |
280 | } | |
281 | ||
282 | // Do a simple PC relative relocation with a Symbol_value with the | |
283 | // addend in the relocation. VALSIZE is the size of the value. | |
284 | template<int valsize> | |
285 | static inline void | |
286 | pcrela(unsigned char* view, | |
287 | const Sized_relobj<size, big_endian>* object, | |
288 | const Symbol_value<size>* psymval, | |
289 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
290 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
291 | { | |
292 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
293 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
294 | Valtype x = psymval->value(object, addend); | |
295 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
296 | } | |
297 | ||
92e059d8 ILT |
298 | typedef Relocate_functions<size, big_endian> This; |
299 | ||
300 | public: | |
b8e6aad9 ILT |
301 | // Do a simple 8-bit REL relocation with the addend in the section |
302 | // contents. | |
92e059d8 ILT |
303 | static inline void |
304 | rel8(unsigned char* view, unsigned char value) | |
b8e6aad9 ILT |
305 | { This::template rel<8>(view, value); } |
306 | ||
307 | static inline void | |
308 | rel8(unsigned char* view, | |
309 | const Sized_relobj<size, big_endian>* object, | |
310 | const Symbol_value<size>* psymval) | |
311 | { This::template rel<8>(view, object, psymval); } | |
92e059d8 | 312 | |
d830e0e0 ILT |
313 | // Do an 8-bit RELA relocation with the addend in the relocation. |
314 | static inline void | |
5b3463d9 | 315 | rela8(unsigned char* view, unsigned char value, unsigned char addend) |
d830e0e0 ILT |
316 | { This::template rela<8>(view, value, addend); } |
317 | ||
318 | static inline void | |
5b3463d9 | 319 | rela8(unsigned char* view, |
d830e0e0 ILT |
320 | const Sized_relobj<size, big_endian>* object, |
321 | const Symbol_value<size>* psymval, | |
322 | unsigned char addend) | |
323 | { This::template rela<8>(view, object, psymval, addend); } | |
324 | ||
92e059d8 | 325 | // Do a simple 8-bit PC relative relocation with the addend in the |
b8e6aad9 | 326 | // section contents. |
92e059d8 ILT |
327 | static inline void |
328 | pcrel8(unsigned char* view, unsigned char value, | |
329 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
330 | { This::template pcrel<8>(view, value, address); } |
331 | ||
332 | static inline void | |
333 | pcrel8(unsigned char* view, | |
334 | const Sized_relobj<size, big_endian>* object, | |
335 | const Symbol_value<size>* psymval, | |
336 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
337 | { This::template pcrel<8>(view, object, psymval, address); } | |
92e059d8 | 338 | |
d830e0e0 ILT |
339 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
340 | // the reloc. | |
341 | static inline void | |
342 | pcrela8(unsigned char* view, unsigned char value, unsigned char addend, | |
343 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
344 | { This::template pcrela<8>(view, value, addend, address); } | |
345 | ||
346 | static inline void | |
347 | pcrela8(unsigned char* view, | |
348 | const Sized_relobj<size, big_endian>* object, | |
349 | const Symbol_value<size>* psymval, | |
350 | unsigned char addend, | |
351 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
352 | { This::template pcrela<8>(view, object, psymval, addend, address); } | |
353 | ||
b8e6aad9 ILT |
354 | // Do a simple 16-bit REL relocation with the addend in the section |
355 | // contents. | |
92e059d8 ILT |
356 | static inline void |
357 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
b8e6aad9 ILT |
358 | { This::template rel<16>(view, value); } |
359 | ||
360 | static inline void | |
361 | rel16(unsigned char* view, | |
362 | const Sized_relobj<size, big_endian>* object, | |
363 | const Symbol_value<size>* psymval) | |
364 | { This::template rel<16>(view, object, psymval); } | |
92e059d8 | 365 | |
d830e0e0 ILT |
366 | // Do an 16-bit RELA relocation with the addend in the relocation. |
367 | static inline void | |
368 | rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend) | |
369 | { This::template rela<16>(view, value, addend); } | |
370 | ||
371 | static inline void | |
372 | rela16(unsigned char* view, | |
373 | const Sized_relobj<size, big_endian>* object, | |
374 | const Symbol_value<size>* psymval, | |
375 | elfcpp::Elf_Half addend) | |
376 | { This::template rela<16>(view, object, psymval, addend); } | |
377 | ||
d830e0e0 | 378 | // Do a simple 16-bit PC relative REL relocation with the addend in |
b8e6aad9 | 379 | // the section contents. |
92e059d8 | 380 | static inline void |
d830e0e0 | 381 | pcrel16(unsigned char* view, elfcpp::Elf_Half value, |
92e059d8 | 382 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
383 | { This::template pcrel<16>(view, value, address); } |
384 | ||
385 | static inline void | |
386 | pcrel16(unsigned char* view, | |
387 | const Sized_relobj<size, big_endian>* object, | |
388 | const Symbol_value<size>* psymval, | |
389 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
390 | { This::template pcrel<16>(view, object, psymval, address); } | |
92e059d8 | 391 | |
d830e0e0 ILT |
392 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
393 | // the reloc. | |
394 | static inline void | |
395 | pcrela16(unsigned char* view, elfcpp::Elf_Half value, | |
396 | elfcpp::Elf_Half addend, | |
397 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
398 | { This::template pcrela<16>(view, value, addend, address); } | |
399 | ||
400 | static inline void | |
401 | pcrela16(unsigned char* view, | |
402 | const Sized_relobj<size, big_endian>* object, | |
403 | const Symbol_value<size>* psymval, | |
404 | elfcpp::Elf_Half addend, | |
405 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
406 | { This::template pcrela<16>(view, object, psymval, addend, address); } | |
407 | ||
92e059d8 ILT |
408 | // Do a simple 32-bit REL relocation with the addend in the section |
409 | // contents. | |
410 | static inline void | |
411 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
b8e6aad9 ILT |
412 | { This::template rel<32>(view, value); } |
413 | ||
414 | static inline void | |
415 | rel32(unsigned char* view, | |
416 | const Sized_relobj<size, big_endian>* object, | |
417 | const Symbol_value<size>* psymval) | |
418 | { This::template rel<32>(view, object, psymval); } | |
92e059d8 | 419 | |
d830e0e0 ILT |
420 | // Do an 32-bit RELA relocation with the addend in the relocation. |
421 | static inline void | |
422 | rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend) | |
423 | { This::template rela<32>(view, value, addend); } | |
424 | ||
425 | static inline void | |
426 | rela32(unsigned char* view, | |
427 | const Sized_relobj<size, big_endian>* object, | |
428 | const Symbol_value<size>* psymval, | |
429 | elfcpp::Elf_Word addend) | |
430 | { This::template rela<32>(view, object, psymval, addend); } | |
431 | ||
92e059d8 ILT |
432 | // Do a simple 32-bit PC relative REL relocation with the addend in |
433 | // the section contents. | |
434 | static inline void | |
435 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
436 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
437 | { This::template pcrel<32>(view, value, address); } |
438 | ||
439 | static inline void | |
440 | pcrel32(unsigned char* view, | |
441 | const Sized_relobj<size, big_endian>* object, | |
442 | const Symbol_value<size>* psymval, | |
443 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
444 | { This::template pcrel<32>(view, object, psymval, address); } | |
92e059d8 | 445 | |
d830e0e0 ILT |
446 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
447 | // the relocation. | |
448 | static inline void | |
449 | pcrela32(unsigned char* view, elfcpp::Elf_Word value, | |
450 | elfcpp::Elf_Word addend, | |
451 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
452 | { This::template pcrela<32>(view, value, addend, address); } | |
453 | ||
454 | static inline void | |
455 | pcrela32(unsigned char* view, | |
456 | const Sized_relobj<size, big_endian>* object, | |
457 | const Symbol_value<size>* psymval, | |
458 | elfcpp::Elf_Word addend, | |
459 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
460 | { This::template pcrela<32>(view, object, psymval, addend, address); } | |
461 | ||
92e059d8 ILT |
462 | // Do a simple 64-bit REL relocation with the addend in the section |
463 | // contents. | |
464 | static inline void | |
f6ce93d6 | 465 | rel64(unsigned char* view, elfcpp::Elf_Xword value) |
b8e6aad9 ILT |
466 | { This::template rel<64>(view, value); } |
467 | ||
468 | static inline void | |
469 | rel64(unsigned char* view, | |
470 | const Sized_relobj<size, big_endian>* object, | |
471 | const Symbol_value<size>* psymval) | |
472 | { This::template rel<64>(view, object, psymval); } | |
92e059d8 | 473 | |
d830e0e0 ILT |
474 | // Do a 64-bit RELA relocation with the addend in the relocation. |
475 | static inline void | |
476 | rela64(unsigned char* view, elfcpp::Elf_Xword value, | |
477 | elfcpp::Elf_Xword addend) | |
478 | { This::template rela<64>(view, value, addend); } | |
479 | ||
480 | static inline void | |
481 | rela64(unsigned char* view, | |
482 | const Sized_relobj<size, big_endian>* object, | |
483 | const Symbol_value<size>* psymval, | |
484 | elfcpp::Elf_Xword addend) | |
485 | { This::template rela<64>(view, object, psymval, addend); } | |
486 | ||
92e059d8 ILT |
487 | // Do a simple 64-bit PC relative REL relocation with the addend in |
488 | // the section contents. | |
489 | static inline void | |
f6ce93d6 | 490 | pcrel64(unsigned char* view, elfcpp::Elf_Xword value, |
92e059d8 | 491 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
492 | { This::template pcrel<64>(view, value, address); } |
493 | ||
494 | static inline void | |
495 | pcrel64(unsigned char* view, | |
496 | const Sized_relobj<size, big_endian>* object, | |
497 | const Symbol_value<size>* psymval, | |
498 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
499 | { This::template pcrel<64>(view, object, psymval, address); } | |
d830e0e0 ILT |
500 | |
501 | // Do a simple 64-bit PC relative RELA relocation with the addend in | |
502 | // the relocation. | |
503 | static inline void | |
504 | pcrela64(unsigned char* view, elfcpp::Elf_Xword value, | |
505 | elfcpp::Elf_Xword addend, | |
506 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
507 | { This::template pcrela<64>(view, value, addend, address); } | |
508 | ||
509 | static inline void | |
510 | pcrela64(unsigned char* view, | |
511 | const Sized_relobj<size, big_endian>* object, | |
512 | const Symbol_value<size>* psymval, | |
513 | elfcpp::Elf_Xword addend, | |
514 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
515 | { This::template pcrela<64>(view, object, psymval, addend, address); } | |
5a6f7e2d ILT |
516 | }; |
517 | ||
518 | // We try to avoid COPY relocations when possible. A COPY relocation | |
519 | // may be required when an executable refers to a variable defined in | |
520 | // a shared library. COPY relocations are problematic because they | |
521 | // tie the executable to the exact size of the variable in the shared | |
522 | // library. We can avoid them if all the references to the variable | |
523 | // are in a writeable section. In that case we can simply use dynamic | |
524 | // relocations. However, when scanning relocs, we don't know when we | |
525 | // see the relocation whether we will be forced to use a COPY | |
526 | // relocation or not. So we have to save the relocation during the | |
527 | // reloc scanning, and then emit it as a dynamic relocation if | |
528 | // necessary. This class implements that. It is used by the target | |
529 | // specific code. | |
530 | ||
531 | template<int size, bool big_endian> | |
532 | class Copy_relocs | |
533 | { | |
534 | public: | |
535 | Copy_relocs() | |
536 | : entries_() | |
537 | { } | |
a3ad94ed ILT |
538 | |
539 | // Return whether we need a COPY reloc for a reloc against GSYM, | |
540 | // which is being applied to section SHNDX in OBJECT. | |
541 | static bool | |
542 | need_copy_reloc(const General_options*, Relobj* object, unsigned int shndx, | |
5a6f7e2d ILT |
543 | Sized_symbol<size>* gsym); |
544 | ||
545 | // Save a Rel against SYM for possible emission later. SHNDX is the | |
546 | // index of the section to which the reloc is being applied. | |
547 | void | |
548 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
4f4c5f80 | 549 | Output_section* output_section, const elfcpp::Rel<size, big_endian>&); |
5a6f7e2d ILT |
550 | |
551 | // Save a Rela against SYM for possible emission later. | |
552 | void | |
553 | save(Symbol* sym, Relobj*, unsigned int shndx, | |
4f4c5f80 | 554 | Output_section* output_section, const elfcpp::Rela<size, big_endian>&); |
5a6f7e2d ILT |
555 | |
556 | // Return whether there are any relocs to emit. This also discards | |
557 | // entries which need not be emitted. | |
558 | bool | |
559 | any_to_emit(); | |
560 | ||
561 | // Emit relocs for each symbol which did not get a COPY reloc (i.e., | |
562 | // is still defined in the dynamic object). | |
563 | template<int sh_type> | |
564 | void | |
565 | emit(Output_data_reloc<sh_type, true, size, big_endian>*); | |
566 | ||
567 | private: | |
568 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
569 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Addend; | |
570 | ||
571 | // This POD class holds the entries we are saving. | |
572 | class Copy_reloc_entry | |
573 | { | |
574 | public: | |
575 | Copy_reloc_entry(Symbol* sym, unsigned int reloc_type, | |
576 | Relobj* relobj, unsigned int shndx, | |
4f4c5f80 | 577 | Output_section* output_section, |
5a6f7e2d ILT |
578 | Address address, Addend addend) |
579 | : sym_(sym), reloc_type_(reloc_type), relobj_(relobj), | |
4f4c5f80 ILT |
580 | shndx_(shndx), output_section_(output_section), |
581 | address_(address), addend_(addend) | |
5a6f7e2d ILT |
582 | { } |
583 | ||
584 | // Return whether we should emit this reloc. If we should not | |
585 | // emit, we clear it. | |
586 | bool | |
587 | should_emit(); | |
588 | ||
589 | // Emit this reloc. | |
590 | ||
591 | void | |
592 | emit(Output_data_reloc<elfcpp::SHT_REL, true, size, big_endian>*); | |
593 | ||
594 | void | |
595 | emit(Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>*); | |
596 | ||
597 | private: | |
598 | Symbol* sym_; | |
599 | unsigned int reloc_type_; | |
600 | Relobj* relobj_; | |
601 | unsigned int shndx_; | |
4f4c5f80 | 602 | Output_section* output_section_; |
5a6f7e2d ILT |
603 | Address address_; |
604 | Addend addend_; | |
605 | }; | |
606 | ||
607 | // A list of relocs to be saved. | |
608 | typedef std::vector<Copy_reloc_entry> Copy_reloc_entries; | |
609 | ||
610 | // The list of relocs we are saving. | |
611 | Copy_reloc_entries entries_; | |
92e059d8 ILT |
612 | }; |
613 | ||
730cdc88 ILT |
614 | // Track relocations while reading a section. This lets you ask for |
615 | // the relocation at a certain offset, and see how relocs occur | |
616 | // between points of interest. | |
617 | ||
618 | template<int size, bool big_endian> | |
619 | class Track_relocs | |
620 | { | |
621 | public: | |
622 | Track_relocs() | |
b696e6d4 | 623 | : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0) |
730cdc88 ILT |
624 | { } |
625 | ||
626 | // Initialize the Track_relocs object. OBJECT is the object holding | |
627 | // the reloc section, RELOC_SHNDX is the section index of the reloc | |
628 | // section, and RELOC_TYPE is the type of the reloc section | |
629 | // (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if | |
630 | // something went wrong. | |
631 | bool | |
b696e6d4 | 632 | initialize(Object* object, unsigned int reloc_shndx, |
730cdc88 ILT |
633 | unsigned int reloc_type); |
634 | ||
635 | // Return the offset in the data section to which the next reloc | |
636 | // applies. THis returns -1 if there is no next reloc. | |
637 | off_t | |
638 | next_offset() const; | |
639 | ||
640 | // Return the symbol index of the next reloc. This returns -1U if | |
641 | // there is no next reloc. | |
642 | unsigned int | |
643 | next_symndx() const; | |
644 | ||
645 | // Advance to OFFSET within the data section, and return the number | |
646 | // of relocs which would be skipped. | |
647 | int | |
648 | advance(off_t offset); | |
649 | ||
650 | private: | |
b696e6d4 | 651 | // The contents of the input object's reloc section. |
730cdc88 ILT |
652 | const unsigned char* prelocs_; |
653 | // The length of the reloc section. | |
8383303e | 654 | section_size_type len_; |
730cdc88 | 655 | // Our current position in the reloc section. |
8383303e | 656 | section_size_type pos_; |
730cdc88 ILT |
657 | // The size of the relocs in the section. |
658 | int reloc_size_; | |
659 | }; | |
660 | ||
61ba1cf9 ILT |
661 | } // End namespace gold. |
662 | ||
663 | #endif // !defined(GOLD_RELOC_H) |