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61ba1cf9 ILT |
1 | // reloc.h -- relocate input files for gold -*- C++ -*- |
2 | ||
4b95cf5c | 3 | // Copyright (C) 2006-2014 Free Software Foundation, Inc. |
6cb15b7f ILT |
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> |
3d857b98 | 27 | #ifdef HAVE_BYTESWAP_H |
92e059d8 | 28 | #include <byteswap.h> |
3d857b98 | 29 | #endif |
92e059d8 | 30 | |
4c50553d | 31 | #include "elfcpp.h" |
61ba1cf9 ILT |
32 | #include "workqueue.h" |
33 | ||
34 | namespace gold | |
35 | { | |
36 | ||
a3ad94ed | 37 | class General_options; |
b696e6d4 | 38 | class Object; |
f6ce93d6 | 39 | class Relobj; |
2c54b4f4 | 40 | struct Read_relocs_data; |
a3ad94ed | 41 | class Symbol; |
ead1e424 | 42 | class Layout; |
6a74a719 | 43 | class Output_data; |
4f4c5f80 | 44 | class Output_section; |
92e059d8 | 45 | |
5a6f7e2d ILT |
46 | template<int size> |
47 | class Sized_symbol; | |
48 | ||
b8e6aad9 | 49 | template<int size, bool big_endian> |
6fa2a40b | 50 | class Sized_relobj_file; |
b8e6aad9 ILT |
51 | |
52 | template<int size> | |
53 | class Symbol_value; | |
54 | ||
5a6f7e2d ILT |
55 | template<int sh_type, bool dynamic, int size, bool big_endian> |
56 | class Output_data_reloc; | |
57 | ||
92e059d8 ILT |
58 | // A class to read the relocations for an object file, and then queue |
59 | // up a task to see if they require any GOT/PLT/COPY relocations in | |
60 | // the symbol table. | |
61 | ||
62 | class Read_relocs : public Task | |
63 | { | |
64 | public: | |
93ceb764 ILT |
65 | // THIS_BLOCKER and NEXT_BLOCKER are passed along to a Scan_relocs |
66 | // or Gc_process_relocs task, so that they run in a deterministic | |
67 | // order. | |
ad0f2072 | 68 | Read_relocs(Symbol_table* symtab, Layout* layout, Relobj* object, |
93ceb764 | 69 | Task_token* this_blocker, Task_token* next_blocker) |
ad0f2072 | 70 | : symtab_(symtab), layout_(layout), object_(object), |
93ceb764 | 71 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
92e059d8 ILT |
72 | { } |
73 | ||
74 | // The standard Task methods. | |
75 | ||
17a1d0a9 ILT |
76 | Task_token* |
77 | is_runnable(); | |
92e059d8 | 78 | |
17a1d0a9 ILT |
79 | void |
80 | locks(Task_locker*); | |
92e059d8 ILT |
81 | |
82 | void | |
83 | run(Workqueue*); | |
84 | ||
c7912668 ILT |
85 | std::string |
86 | get_name() const; | |
87 | ||
92e059d8 | 88 | private: |
92e059d8 | 89 | Symbol_table* symtab_; |
ead1e424 | 90 | Layout* layout_; |
f6ce93d6 | 91 | Relobj* object_; |
93ceb764 ILT |
92 | Task_token* this_blocker_; |
93 | Task_token* next_blocker_; | |
92e059d8 ILT |
94 | }; |
95 | ||
6d03d481 ST |
96 | // Process the relocs to figure out which sections are garbage. |
97 | // Very similar to scan relocs. | |
98 | ||
99 | class Gc_process_relocs : public Task | |
100 | { | |
101 | public: | |
93ceb764 ILT |
102 | // THIS_BLOCKER prevents this task from running until the previous |
103 | // one is finished. NEXT_BLOCKER prevents the next task from | |
104 | // running. | |
ad0f2072 | 105 | Gc_process_relocs(Symbol_table* symtab, Layout* layout, Relobj* object, |
93ceb764 ILT |
106 | Read_relocs_data* rd, Task_token* this_blocker, |
107 | Task_token* next_blocker) | |
ad0f2072 | 108 | : symtab_(symtab), layout_(layout), object_(object), rd_(rd), |
93ceb764 | 109 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
6d03d481 ST |
110 | { } |
111 | ||
93ceb764 ILT |
112 | ~Gc_process_relocs(); |
113 | ||
6d03d481 ST |
114 | // The standard Task methods. |
115 | ||
116 | Task_token* | |
117 | is_runnable(); | |
118 | ||
119 | void | |
120 | locks(Task_locker*); | |
121 | ||
122 | void | |
123 | run(Workqueue*); | |
124 | ||
125 | std::string | |
126 | get_name() const; | |
127 | ||
128 | private: | |
6d03d481 ST |
129 | Symbol_table* symtab_; |
130 | Layout* layout_; | |
131 | Relobj* object_; | |
132 | Read_relocs_data* rd_; | |
93ceb764 ILT |
133 | Task_token* this_blocker_; |
134 | Task_token* next_blocker_; | |
6d03d481 ST |
135 | }; |
136 | ||
92e059d8 ILT |
137 | // Scan the relocations for an object to see if they require any |
138 | // GOT/PLT/COPY relocations. | |
139 | ||
140 | class Scan_relocs : public Task | |
141 | { | |
142 | public: | |
93ceb764 ILT |
143 | // THIS_BLOCKER prevents this task from running until the previous |
144 | // one is finished. NEXT_BLOCKER prevents the next task from | |
145 | // running. | |
ad0f2072 | 146 | Scan_relocs(Symbol_table* symtab, Layout* layout, Relobj* object, |
93ceb764 ILT |
147 | Read_relocs_data* rd, Task_token* this_blocker, |
148 | Task_token* next_blocker) | |
ad0f2072 | 149 | : symtab_(symtab), layout_(layout), object_(object), rd_(rd), |
93ceb764 | 150 | this_blocker_(this_blocker), next_blocker_(next_blocker) |
92e059d8 ILT |
151 | { } |
152 | ||
93ceb764 ILT |
153 | ~Scan_relocs(); |
154 | ||
92e059d8 ILT |
155 | // The standard Task methods. |
156 | ||
17a1d0a9 ILT |
157 | Task_token* |
158 | is_runnable(); | |
92e059d8 | 159 | |
17a1d0a9 ILT |
160 | void |
161 | locks(Task_locker*); | |
92e059d8 ILT |
162 | |
163 | void | |
164 | run(Workqueue*); | |
165 | ||
c7912668 ILT |
166 | std::string |
167 | get_name() const; | |
168 | ||
92e059d8 | 169 | private: |
92e059d8 | 170 | Symbol_table* symtab_; |
ead1e424 | 171 | Layout* layout_; |
f6ce93d6 | 172 | Relobj* object_; |
92e059d8 | 173 | Read_relocs_data* rd_; |
93ceb764 ILT |
174 | Task_token* this_blocker_; |
175 | Task_token* next_blocker_; | |
92e059d8 ILT |
176 | }; |
177 | ||
178 | // A class to perform all the relocations for an object file. | |
179 | ||
61ba1cf9 ILT |
180 | class Relocate_task : public Task |
181 | { | |
182 | public: | |
ad0f2072 ILT |
183 | Relocate_task(const Symbol_table* symtab, const Layout* layout, |
184 | Relobj* object, Output_file* of, | |
730cdc88 ILT |
185 | Task_token* input_sections_blocker, |
186 | Task_token* output_sections_blocker, Task_token* final_blocker) | |
ad0f2072 ILT |
187 | : symtab_(symtab), layout_(layout), object_(object), of_(of), |
188 | input_sections_blocker_(input_sections_blocker), | |
730cdc88 ILT |
189 | output_sections_blocker_(output_sections_blocker), |
190 | final_blocker_(final_blocker) | |
61ba1cf9 ILT |
191 | { } |
192 | ||
193 | // The standard Task methods. | |
194 | ||
17a1d0a9 ILT |
195 | Task_token* |
196 | is_runnable(); | |
61ba1cf9 | 197 | |
17a1d0a9 ILT |
198 | void |
199 | locks(Task_locker*); | |
61ba1cf9 ILT |
200 | |
201 | void | |
202 | run(Workqueue*); | |
203 | ||
c7912668 ILT |
204 | std::string |
205 | get_name() const; | |
206 | ||
61ba1cf9 | 207 | private: |
61ba1cf9 | 208 | const Symbol_table* symtab_; |
92e059d8 | 209 | const Layout* layout_; |
f6ce93d6 | 210 | Relobj* object_; |
61ba1cf9 | 211 | Output_file* of_; |
730cdc88 ILT |
212 | Task_token* input_sections_blocker_; |
213 | Task_token* output_sections_blocker_; | |
61ba1cf9 ILT |
214 | Task_token* final_blocker_; |
215 | }; | |
216 | ||
6a74a719 ILT |
217 | // During a relocatable link, this class records how relocations |
218 | // should be handled for a single input reloc section. An instance of | |
219 | // this class is created while scanning relocs, and it is used while | |
220 | // processing relocs. | |
221 | ||
222 | class Relocatable_relocs | |
223 | { | |
224 | public: | |
225 | // We use a vector of unsigned char to indicate how the input relocs | |
226 | // should be handled. Each element is one of the following values. | |
227 | // We create this vector when we initially scan the relocations. | |
228 | enum Reloc_strategy | |
229 | { | |
230 | // Copy the input reloc. Don't modify it other than updating the | |
231 | // r_offset field and the r_sym part of the r_info field. | |
232 | RELOC_COPY, | |
233 | // Copy the input reloc which is against an STT_SECTION symbol. | |
234 | // Update the r_offset and r_sym part of the r_info field. Adjust | |
235 | // the addend by subtracting the value of the old local symbol and | |
236 | // adding the value of the new local symbol. The addend is in the | |
237 | // SHT_RELA reloc and the contents of the data section do not need | |
238 | // to be changed. | |
239 | RELOC_ADJUST_FOR_SECTION_RELA, | |
7019cd25 ILT |
240 | // Like RELOC_ADJUST_FOR_SECTION_RELA but the addend should not be |
241 | // adjusted. | |
242 | RELOC_ADJUST_FOR_SECTION_0, | |
6a74a719 ILT |
243 | // Like RELOC_ADJUST_FOR_SECTION_RELA but the contents of the |
244 | // section need to be changed. The number indicates the number of | |
245 | // bytes in the addend in the section contents. | |
246 | RELOC_ADJUST_FOR_SECTION_1, | |
247 | RELOC_ADJUST_FOR_SECTION_2, | |
248 | RELOC_ADJUST_FOR_SECTION_4, | |
249 | RELOC_ADJUST_FOR_SECTION_8, | |
2c339f71 DK |
250 | // Like RELOC_ADJUST_FOR_SECTION_4 but for unaligned relocs. |
251 | RELOC_ADJUST_FOR_SECTION_4_UNALIGNED, | |
6a74a719 ILT |
252 | // Discard the input reloc--process it completely when relocating |
253 | // the data section contents. | |
254 | RELOC_DISCARD, | |
255 | // An input reloc which is not discarded, but which requires | |
256 | // target specific processing in order to update it. | |
257 | RELOC_SPECIAL | |
258 | }; | |
259 | ||
260 | Relocatable_relocs() | |
261 | : reloc_strategies_(), output_reloc_count_(0), posd_(NULL) | |
262 | { } | |
263 | ||
264 | // Record the number of relocs. | |
265 | void | |
266 | set_reloc_count(size_t reloc_count) | |
267 | { this->reloc_strategies_.reserve(reloc_count); } | |
268 | ||
269 | // Record what to do for the next reloc. | |
270 | void | |
2ea97941 | 271 | set_next_reloc_strategy(Reloc_strategy strategy) |
6a74a719 | 272 | { |
2ea97941 ILT |
273 | this->reloc_strategies_.push_back(static_cast<unsigned char>(strategy)); |
274 | if (strategy != RELOC_DISCARD) | |
6a74a719 ILT |
275 | ++this->output_reloc_count_; |
276 | } | |
277 | ||
278 | // Record the Output_data associated with this reloc section. | |
279 | void | |
280 | set_output_data(Output_data* posd) | |
281 | { | |
282 | gold_assert(this->posd_ == NULL); | |
283 | this->posd_ = posd; | |
284 | } | |
285 | ||
286 | // Return the Output_data associated with this reloc section. | |
287 | Output_data* | |
288 | output_data() const | |
289 | { return this->posd_; } | |
290 | ||
291 | // Return what to do for reloc I. | |
292 | Reloc_strategy | |
293 | strategy(unsigned int i) const | |
294 | { | |
295 | gold_assert(i < this->reloc_strategies_.size()); | |
296 | return static_cast<Reloc_strategy>(this->reloc_strategies_[i]); | |
297 | } | |
298 | ||
299 | // Return the number of relocations to create in the output file. | |
300 | size_t | |
301 | output_reloc_count() const | |
302 | { return this->output_reloc_count_; } | |
303 | ||
304 | private: | |
305 | typedef std::vector<unsigned char> Reloc_strategies; | |
306 | ||
307 | // The strategies for the input reloc. There is one entry in this | |
308 | // vector for each relocation in the input section. | |
309 | Reloc_strategies reloc_strategies_; | |
310 | // The number of relocations to be created in the output file. | |
311 | size_t output_reloc_count_; | |
312 | // The output data structure associated with this relocation. | |
313 | Output_data* posd_; | |
314 | }; | |
315 | ||
92e059d8 ILT |
316 | // Standard relocation routines which are used on many targets. Here |
317 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
318 | ||
319 | template<int size, bool big_endian> | |
320 | class Relocate_functions | |
321 | { | |
322 | private: | |
323 | // Do a simple relocation with the addend in the section contents. | |
324 | // VALSIZE is the size of the value. | |
325 | template<int valsize> | |
326 | static inline void | |
f6ce93d6 ILT |
327 | rel(unsigned char* view, |
328 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
92e059d8 | 329 | { |
f6ce93d6 | 330 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 331 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
332 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
333 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value); | |
92e059d8 ILT |
334 | } |
335 | ||
29ab395d DK |
336 | // Like the above but for relocs at unaligned addresses. |
337 | template<int valsize> | |
338 | static inline void | |
339 | rel_unaligned(unsigned char* view, | |
340 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
341 | { | |
342 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
343 | Valtype; | |
344 | Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); | |
345 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x + value); | |
346 | } | |
347 | ||
b8e6aad9 ILT |
348 | // Do a simple relocation using a Symbol_value with the addend in |
349 | // the section contents. VALSIZE is the size of the value to | |
350 | // relocate. | |
351 | template<int valsize> | |
352 | static inline void | |
353 | rel(unsigned char* view, | |
6fa2a40b | 354 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
355 | const Symbol_value<size>* psymval) |
356 | { | |
357 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
358 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
359 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
360 | x = psymval->value(object, x); | |
361 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
362 | } | |
363 | ||
2c339f71 DK |
364 | // Like the above but for relocs at unaligned addresses. |
365 | template<int valsize> | |
366 | static inline void | |
367 | rel_unaligned(unsigned char* view, | |
368 | const Sized_relobj_file<size, big_endian>* object, | |
369 | const Symbol_value<size>* psymval) | |
370 | { | |
371 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
372 | Valtype; | |
373 | Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); | |
374 | x = psymval->value(object, x); | |
375 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x); | |
376 | } | |
377 | ||
d830e0e0 ILT |
378 | // Do a simple relocation with the addend in the relocation. |
379 | // VALSIZE is the size of the value. | |
380 | template<int valsize> | |
381 | static inline void | |
382 | rela(unsigned char* view, | |
383 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
384 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
385 | { | |
386 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
387 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
388 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend); | |
389 | } | |
390 | ||
391 | // Do a simple relocation using a symbol value with the addend in | |
392 | // the relocation. VALSIZE is the size of the value. | |
393 | template<int valsize> | |
394 | static inline void | |
395 | rela(unsigned char* view, | |
6fa2a40b | 396 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
397 | const Symbol_value<size>* psymval, |
398 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
399 | { | |
400 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
401 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
402 | Valtype x = psymval->value(object, addend); | |
403 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
404 | } | |
405 | ||
92e059d8 ILT |
406 | // Do a simple PC relative relocation with the addend in the section |
407 | // contents. VALSIZE is the size of the value. | |
408 | template<int valsize> | |
409 | static inline void | |
f6ce93d6 ILT |
410 | pcrel(unsigned char* view, |
411 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
92e059d8 ILT |
412 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
413 | { | |
f6ce93d6 | 414 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 415 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
416 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
417 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
92e059d8 ILT |
418 | } |
419 | ||
29ab395d DK |
420 | // Like the above but for relocs at unaligned addresses. |
421 | template<int valsize> | |
422 | static inline void | |
423 | pcrel_unaligned(unsigned char* view, | |
424 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
425 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
426 | { | |
427 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
428 | Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); | |
429 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, | |
430 | x + value - address); | |
431 | } | |
432 | ||
b8e6aad9 ILT |
433 | // Do a simple PC relative relocation with a Symbol_value with the |
434 | // addend in the section contents. VALSIZE is the size of the | |
435 | // value. | |
436 | template<int valsize> | |
437 | static inline void | |
438 | pcrel(unsigned char* view, | |
6fa2a40b | 439 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
440 | const Symbol_value<size>* psymval, |
441 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
442 | { | |
443 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
444 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
445 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
446 | x = psymval->value(object, x); | |
447 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
448 | } | |
449 | ||
d830e0e0 ILT |
450 | // Do a simple PC relative relocation with the addend in the |
451 | // relocation. VALSIZE is the size of the value. | |
452 | template<int valsize> | |
453 | static inline void | |
454 | pcrela(unsigned char* view, | |
455 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
456 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
457 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
458 | { | |
459 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
460 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
461 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address); | |
462 | } | |
463 | ||
464 | // Do a simple PC relative relocation with a Symbol_value with the | |
465 | // addend in the relocation. VALSIZE is the size of the value. | |
466 | template<int valsize> | |
467 | static inline void | |
468 | pcrela(unsigned char* view, | |
6fa2a40b | 469 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
470 | const Symbol_value<size>* psymval, |
471 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
472 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
473 | { | |
474 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
475 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
476 | Valtype x = psymval->value(object, addend); | |
477 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
478 | } | |
479 | ||
92e059d8 ILT |
480 | typedef Relocate_functions<size, big_endian> This; |
481 | ||
482 | public: | |
b8e6aad9 ILT |
483 | // Do a simple 8-bit REL relocation with the addend in the section |
484 | // contents. | |
92e059d8 ILT |
485 | static inline void |
486 | rel8(unsigned char* view, unsigned char value) | |
b8e6aad9 ILT |
487 | { This::template rel<8>(view, value); } |
488 | ||
489 | static inline void | |
490 | rel8(unsigned char* view, | |
6fa2a40b | 491 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
492 | const Symbol_value<size>* psymval) |
493 | { This::template rel<8>(view, object, psymval); } | |
92e059d8 | 494 | |
d830e0e0 ILT |
495 | // Do an 8-bit RELA relocation with the addend in the relocation. |
496 | static inline void | |
5b3463d9 | 497 | rela8(unsigned char* view, unsigned char value, unsigned char addend) |
d830e0e0 ILT |
498 | { This::template rela<8>(view, value, addend); } |
499 | ||
500 | static inline void | |
5b3463d9 | 501 | rela8(unsigned char* view, |
6fa2a40b | 502 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
503 | const Symbol_value<size>* psymval, |
504 | unsigned char addend) | |
505 | { This::template rela<8>(view, object, psymval, addend); } | |
506 | ||
92e059d8 | 507 | // Do a simple 8-bit PC relative relocation with the addend in the |
b8e6aad9 | 508 | // section contents. |
92e059d8 ILT |
509 | static inline void |
510 | pcrel8(unsigned char* view, unsigned char value, | |
511 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
512 | { This::template pcrel<8>(view, value, address); } |
513 | ||
514 | static inline void | |
515 | pcrel8(unsigned char* view, | |
6fa2a40b | 516 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
517 | const Symbol_value<size>* psymval, |
518 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
519 | { This::template pcrel<8>(view, object, psymval, address); } | |
92e059d8 | 520 | |
d830e0e0 ILT |
521 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
522 | // the reloc. | |
523 | static inline void | |
524 | pcrela8(unsigned char* view, unsigned char value, unsigned char addend, | |
525 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
526 | { This::template pcrela<8>(view, value, addend, address); } | |
527 | ||
528 | static inline void | |
529 | pcrela8(unsigned char* view, | |
6fa2a40b | 530 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
531 | const Symbol_value<size>* psymval, |
532 | unsigned char addend, | |
533 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
534 | { This::template pcrela<8>(view, object, psymval, addend, address); } | |
535 | ||
b8e6aad9 ILT |
536 | // Do a simple 16-bit REL relocation with the addend in the section |
537 | // contents. | |
92e059d8 ILT |
538 | static inline void |
539 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
b8e6aad9 ILT |
540 | { This::template rel<16>(view, value); } |
541 | ||
542 | static inline void | |
543 | rel16(unsigned char* view, | |
6fa2a40b | 544 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
545 | const Symbol_value<size>* psymval) |
546 | { This::template rel<16>(view, object, psymval); } | |
92e059d8 | 547 | |
d830e0e0 ILT |
548 | // Do an 16-bit RELA relocation with the addend in the relocation. |
549 | static inline void | |
550 | rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend) | |
551 | { This::template rela<16>(view, value, addend); } | |
552 | ||
553 | static inline void | |
554 | rela16(unsigned char* view, | |
6fa2a40b | 555 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
556 | const Symbol_value<size>* psymval, |
557 | elfcpp::Elf_Half addend) | |
558 | { This::template rela<16>(view, object, psymval, addend); } | |
559 | ||
d830e0e0 | 560 | // Do a simple 16-bit PC relative REL relocation with the addend in |
b8e6aad9 | 561 | // the section contents. |
92e059d8 | 562 | static inline void |
d830e0e0 | 563 | pcrel16(unsigned char* view, elfcpp::Elf_Half value, |
92e059d8 | 564 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
565 | { This::template pcrel<16>(view, value, address); } |
566 | ||
567 | static inline void | |
568 | pcrel16(unsigned char* view, | |
6fa2a40b | 569 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
570 | const Symbol_value<size>* psymval, |
571 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
572 | { This::template pcrel<16>(view, object, psymval, address); } | |
92e059d8 | 573 | |
d830e0e0 ILT |
574 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
575 | // the reloc. | |
576 | static inline void | |
577 | pcrela16(unsigned char* view, elfcpp::Elf_Half value, | |
578 | elfcpp::Elf_Half addend, | |
579 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
580 | { This::template pcrela<16>(view, value, addend, address); } | |
581 | ||
582 | static inline void | |
583 | pcrela16(unsigned char* view, | |
6fa2a40b | 584 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
585 | const Symbol_value<size>* psymval, |
586 | elfcpp::Elf_Half addend, | |
587 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
588 | { This::template pcrela<16>(view, object, psymval, addend, address); } | |
589 | ||
92e059d8 ILT |
590 | // Do a simple 32-bit REL relocation with the addend in the section |
591 | // contents. | |
592 | static inline void | |
593 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
b8e6aad9 ILT |
594 | { This::template rel<32>(view, value); } |
595 | ||
29ab395d DK |
596 | // Like above but for relocs at unaligned addresses. |
597 | static inline void | |
598 | rel32_unaligned(unsigned char* view, elfcpp::Elf_Word value) | |
599 | { This::template rel_unaligned<32>(view, value); } | |
600 | ||
b8e6aad9 ILT |
601 | static inline void |
602 | rel32(unsigned char* view, | |
6fa2a40b | 603 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
604 | const Symbol_value<size>* psymval) |
605 | { This::template rel<32>(view, object, psymval); } | |
92e059d8 | 606 | |
2c339f71 DK |
607 | // Like above but for relocs at unaligned addresses. |
608 | static inline void | |
609 | rel32_unaligned(unsigned char* view, | |
610 | const Sized_relobj_file<size, big_endian>* object, | |
611 | const Symbol_value<size>* psymval) | |
612 | { This::template rel_unaligned<32>(view, object, psymval); } | |
613 | ||
d830e0e0 ILT |
614 | // Do an 32-bit RELA relocation with the addend in the relocation. |
615 | static inline void | |
616 | rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend) | |
617 | { This::template rela<32>(view, value, addend); } | |
618 | ||
619 | static inline void | |
620 | rela32(unsigned char* view, | |
6fa2a40b | 621 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
622 | const Symbol_value<size>* psymval, |
623 | elfcpp::Elf_Word addend) | |
624 | { This::template rela<32>(view, object, psymval, addend); } | |
625 | ||
92e059d8 ILT |
626 | // Do a simple 32-bit PC relative REL relocation with the addend in |
627 | // the section contents. | |
628 | static inline void | |
629 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
630 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
631 | { This::template pcrel<32>(view, value, address); } |
632 | ||
29ab395d DK |
633 | // Unaligned version of the above. |
634 | static inline void | |
635 | pcrel32_unaligned(unsigned char* view, elfcpp::Elf_Word value, | |
636 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
637 | { This::template pcrel_unaligned<32>(view, value, address); } | |
638 | ||
b8e6aad9 ILT |
639 | static inline void |
640 | pcrel32(unsigned char* view, | |
6fa2a40b | 641 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
642 | const Symbol_value<size>* psymval, |
643 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
644 | { This::template pcrel<32>(view, object, psymval, address); } | |
92e059d8 | 645 | |
d830e0e0 ILT |
646 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
647 | // the relocation. | |
648 | static inline void | |
649 | pcrela32(unsigned char* view, elfcpp::Elf_Word value, | |
650 | elfcpp::Elf_Word addend, | |
651 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
652 | { This::template pcrela<32>(view, value, addend, address); } | |
653 | ||
654 | static inline void | |
655 | pcrela32(unsigned char* view, | |
6fa2a40b | 656 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
657 | const Symbol_value<size>* psymval, |
658 | elfcpp::Elf_Word addend, | |
659 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
660 | { This::template pcrela<32>(view, object, psymval, addend, address); } | |
661 | ||
92e059d8 ILT |
662 | // Do a simple 64-bit REL relocation with the addend in the section |
663 | // contents. | |
664 | static inline void | |
f6ce93d6 | 665 | rel64(unsigned char* view, elfcpp::Elf_Xword value) |
b8e6aad9 ILT |
666 | { This::template rel<64>(view, value); } |
667 | ||
668 | static inline void | |
669 | rel64(unsigned char* view, | |
6fa2a40b | 670 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
671 | const Symbol_value<size>* psymval) |
672 | { This::template rel<64>(view, object, psymval); } | |
92e059d8 | 673 | |
d830e0e0 ILT |
674 | // Do a 64-bit RELA relocation with the addend in the relocation. |
675 | static inline void | |
676 | rela64(unsigned char* view, elfcpp::Elf_Xword value, | |
677 | elfcpp::Elf_Xword addend) | |
678 | { This::template rela<64>(view, value, addend); } | |
679 | ||
680 | static inline void | |
681 | rela64(unsigned char* view, | |
6fa2a40b | 682 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
683 | const Symbol_value<size>* psymval, |
684 | elfcpp::Elf_Xword addend) | |
685 | { This::template rela<64>(view, object, psymval, addend); } | |
686 | ||
92e059d8 ILT |
687 | // Do a simple 64-bit PC relative REL relocation with the addend in |
688 | // the section contents. | |
689 | static inline void | |
f6ce93d6 | 690 | pcrel64(unsigned char* view, elfcpp::Elf_Xword value, |
92e059d8 | 691 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
692 | { This::template pcrel<64>(view, value, address); } |
693 | ||
694 | static inline void | |
695 | pcrel64(unsigned char* view, | |
6fa2a40b | 696 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
697 | const Symbol_value<size>* psymval, |
698 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
699 | { This::template pcrel<64>(view, object, psymval, address); } | |
d830e0e0 ILT |
700 | |
701 | // Do a simple 64-bit PC relative RELA relocation with the addend in | |
702 | // the relocation. | |
703 | static inline void | |
704 | pcrela64(unsigned char* view, elfcpp::Elf_Xword value, | |
705 | elfcpp::Elf_Xword addend, | |
706 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
707 | { This::template pcrela<64>(view, value, addend, address); } | |
708 | ||
709 | static inline void | |
710 | pcrela64(unsigned char* view, | |
6fa2a40b | 711 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
712 | const Symbol_value<size>* psymval, |
713 | elfcpp::Elf_Xword addend, | |
714 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
715 | { This::template pcrela<64>(view, object, psymval, addend, address); } | |
5a6f7e2d ILT |
716 | }; |
717 | ||
bef2b434 ILT |
718 | // Integer manipulation functions used by various targets when |
719 | // performing relocations. | |
720 | ||
721 | template<int bits> | |
722 | class Bits | |
723 | { | |
724 | public: | |
725 | // Sign extend an n-bit unsigned integer stored in a uint32_t into | |
2c175ebc | 726 | // an int32_t. BITS must be between 1 and 32. |
bef2b434 ILT |
727 | static inline int32_t |
728 | sign_extend32(uint32_t val) | |
729 | { | |
2c175ebc | 730 | gold_assert(bits > 0 && bits <= 32); |
bef2b434 ILT |
731 | if (bits == 32) |
732 | return static_cast<int32_t>(val); | |
733 | uint32_t mask = (~static_cast<uint32_t>(0)) >> (32 - bits); | |
734 | val &= mask; | |
735 | uint32_t top_bit = 1U << (bits - 1); | |
736 | int32_t as_signed = static_cast<int32_t>(val); | |
737 | if ((val & top_bit) != 0) | |
738 | as_signed -= static_cast<int32_t>(top_bit * 2); | |
739 | return as_signed; | |
740 | } | |
741 | ||
742 | // Return true if VAL (stored in a uint32_t) has overflowed a signed | |
743 | // value with BITS bits. | |
744 | static inline bool | |
745 | has_overflow32(uint32_t val) | |
746 | { | |
2c175ebc | 747 | gold_assert(bits > 0 && bits <= 32); |
bef2b434 ILT |
748 | if (bits == 32) |
749 | return false; | |
750 | int32_t max = (1 << (bits - 1)) - 1; | |
751 | int32_t min = -(1 << (bits - 1)); | |
752 | int32_t as_signed = static_cast<int32_t>(val); | |
753 | return as_signed > max || as_signed < min; | |
754 | } | |
755 | ||
756 | // Return true if VAL (stored in a uint32_t) has overflowed both a | |
757 | // signed and an unsigned value. E.g., | |
758 | // Bits<8>::has_signed_unsigned_overflow32 would check -128 <= VAL < | |
759 | // 255. | |
760 | static inline bool | |
761 | has_signed_unsigned_overflow32(uint32_t val) | |
762 | { | |
2c175ebc | 763 | gold_assert(bits > 0 && bits <= 32); |
bef2b434 ILT |
764 | if (bits == 32) |
765 | return false; | |
766 | int32_t max = static_cast<int32_t>((1U << bits) - 1); | |
767 | int32_t min = -(1 << (bits - 1)); | |
768 | int32_t as_signed = static_cast<int32_t>(val); | |
769 | return as_signed > max || as_signed < min; | |
770 | } | |
771 | ||
772 | // Select bits from A and B using bits in MASK. For each n in | |
773 | // [0..31], the n-th bit in the result is chosen from the n-th bits | |
774 | // of A and B. A zero selects A and a one selects B. | |
775 | static inline uint32_t | |
776 | bit_select32(uint32_t a, uint32_t b, uint32_t mask) | |
777 | { return (a & ~mask) | (b & mask); } | |
778 | ||
779 | // Sign extend an n-bit unsigned integer stored in a uint64_t into | |
2c175ebc | 780 | // an int64_t. BITS must be between 1 and 64. |
bef2b434 ILT |
781 | static inline int64_t |
782 | sign_extend(uint64_t val) | |
783 | { | |
2c175ebc | 784 | gold_assert(bits > 0 && bits <= 64); |
bef2b434 ILT |
785 | if (bits == 64) |
786 | return static_cast<int64_t>(val); | |
787 | uint64_t mask = (~static_cast<uint64_t>(0)) >> (64 - bits); | |
788 | val &= mask; | |
789 | uint64_t top_bit = static_cast<uint64_t>(1) << (bits - 1); | |
790 | int64_t as_signed = static_cast<int64_t>(val); | |
791 | if ((val & top_bit) != 0) | |
792 | as_signed -= static_cast<int64_t>(top_bit * 2); | |
793 | return as_signed; | |
794 | } | |
795 | ||
796 | // Return true if VAL (stored in a uint64_t) has overflowed a signed | |
797 | // value with BITS bits. | |
798 | static inline bool | |
799 | has_overflow(uint64_t val) | |
800 | { | |
2c175ebc | 801 | gold_assert(bits > 0 && bits <= 64); |
bef2b434 ILT |
802 | if (bits == 64) |
803 | return false; | |
804 | int64_t max = (static_cast<int64_t>(1) << (bits - 1)) - 1; | |
805 | int64_t min = -(static_cast<int64_t>(1) << (bits - 1)); | |
806 | int64_t as_signed = static_cast<int64_t>(val); | |
807 | return as_signed > max || as_signed < min; | |
808 | } | |
809 | ||
810 | // Return true if VAL (stored in a uint64_t) has overflowed both a | |
811 | // signed and an unsigned value. E.g., | |
812 | // Bits<8>::has_signed_unsigned_overflow would check -128 <= VAL < | |
813 | // 255. | |
814 | static inline bool | |
815 | has_signed_unsigned_overflow64(uint64_t val) | |
816 | { | |
2c175ebc | 817 | gold_assert(bits > 0 && bits <= 64); |
bef2b434 ILT |
818 | if (bits == 64) |
819 | return false; | |
820 | int64_t max = static_cast<int64_t>((static_cast<uint64_t>(1) << bits) - 1); | |
821 | int64_t min = -(static_cast<int64_t>(1) << (bits - 1)); | |
822 | int64_t as_signed = static_cast<int64_t>(val); | |
823 | return as_signed > max || as_signed < min; | |
824 | } | |
825 | ||
826 | // Select bits from A and B using bits in MASK. For each n in | |
827 | // [0..31], the n-th bit in the result is chosen from the n-th bits | |
828 | // of A and B. A zero selects A and a one selects B. | |
829 | static inline uint64_t | |
830 | bit_select64(uint64_t a, uint64_t b, uint64_t mask) | |
831 | { return (a & ~mask) | (b & mask); } | |
832 | }; | |
833 | ||
730cdc88 ILT |
834 | // Track relocations while reading a section. This lets you ask for |
835 | // the relocation at a certain offset, and see how relocs occur | |
836 | // between points of interest. | |
837 | ||
838 | template<int size, bool big_endian> | |
839 | class Track_relocs | |
840 | { | |
841 | public: | |
842 | Track_relocs() | |
b696e6d4 | 843 | : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0) |
730cdc88 ILT |
844 | { } |
845 | ||
846 | // Initialize the Track_relocs object. OBJECT is the object holding | |
847 | // the reloc section, RELOC_SHNDX is the section index of the reloc | |
848 | // section, and RELOC_TYPE is the type of the reloc section | |
849 | // (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if | |
850 | // something went wrong. | |
851 | bool | |
b696e6d4 | 852 | initialize(Object* object, unsigned int reloc_shndx, |
730cdc88 ILT |
853 | unsigned int reloc_type); |
854 | ||
855 | // Return the offset in the data section to which the next reloc | |
4dbfafcc | 856 | // applies. This returns -1 if there is no next reloc. |
730cdc88 ILT |
857 | off_t |
858 | next_offset() const; | |
859 | ||
860 | // Return the symbol index of the next reloc. This returns -1U if | |
861 | // there is no next reloc. | |
862 | unsigned int | |
863 | next_symndx() const; | |
864 | ||
4dbfafcc ILT |
865 | // Return the addend of the next reloc. This returns 0 if there is |
866 | // no next reloc. | |
867 | uint64_t | |
868 | next_addend() const; | |
869 | ||
730cdc88 ILT |
870 | // Advance to OFFSET within the data section, and return the number |
871 | // of relocs which would be skipped. | |
872 | int | |
873 | advance(off_t offset); | |
874 | ||
c1027032 CC |
875 | // Checkpoint the current position in the reloc section. |
876 | section_size_type | |
877 | checkpoint() const | |
878 | { return this->pos_; } | |
879 | ||
880 | // Reset the position to CHECKPOINT. | |
881 | void | |
882 | reset(section_size_type checkpoint) | |
883 | { this->pos_ = checkpoint; } | |
884 | ||
730cdc88 | 885 | private: |
b696e6d4 | 886 | // The contents of the input object's reloc section. |
730cdc88 ILT |
887 | const unsigned char* prelocs_; |
888 | // The length of the reloc section. | |
8383303e | 889 | section_size_type len_; |
730cdc88 | 890 | // Our current position in the reloc section. |
8383303e | 891 | section_size_type pos_; |
730cdc88 ILT |
892 | // The size of the relocs in the section. |
893 | int reloc_size_; | |
894 | }; | |
895 | ||
61ba1cf9 ILT |
896 | } // End namespace gold. |
897 | ||
898 | #endif // !defined(GOLD_RELOC_H) |