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61ba1cf9 ILT |
1 | // reloc.h -- relocate input files for gold -*- C++ -*- |
2 | ||
6f2750fe | 3 | // Copyright (C) 2006-2016 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 | ||
91a65d2f AM |
299 | // Set the strategy for reloc I. |
300 | void | |
301 | set_strategy(unsigned int i, Reloc_strategy strategy) | |
302 | { | |
303 | gold_assert(i < this->reloc_strategies_.size()); | |
304 | this->reloc_strategies_[i] = strategy; | |
305 | } | |
306 | ||
6a74a719 ILT |
307 | // Return the number of relocations to create in the output file. |
308 | size_t | |
309 | output_reloc_count() const | |
310 | { return this->output_reloc_count_; } | |
311 | ||
312 | private: | |
313 | typedef std::vector<unsigned char> Reloc_strategies; | |
314 | ||
315 | // The strategies for the input reloc. There is one entry in this | |
316 | // vector for each relocation in the input section. | |
317 | Reloc_strategies reloc_strategies_; | |
318 | // The number of relocations to be created in the output file. | |
319 | size_t output_reloc_count_; | |
320 | // The output data structure associated with this relocation. | |
321 | Output_data* posd_; | |
322 | }; | |
323 | ||
92e059d8 ILT |
324 | // Standard relocation routines which are used on many targets. Here |
325 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
326 | ||
327 | template<int size, bool big_endian> | |
328 | class Relocate_functions | |
329 | { | |
330 | private: | |
331 | // Do a simple relocation with the addend in the section contents. | |
332 | // VALSIZE is the size of the value. | |
333 | template<int valsize> | |
334 | static inline void | |
f6ce93d6 ILT |
335 | rel(unsigned char* view, |
336 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
92e059d8 | 337 | { |
f6ce93d6 | 338 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 339 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
340 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
341 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value); | |
92e059d8 ILT |
342 | } |
343 | ||
29ab395d DK |
344 | // Like the above but for relocs at unaligned addresses. |
345 | template<int valsize> | |
346 | static inline void | |
347 | rel_unaligned(unsigned char* view, | |
348 | typename elfcpp::Swap<valsize, big_endian>::Valtype value) | |
349 | { | |
350 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
351 | Valtype; | |
352 | Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); | |
353 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x + value); | |
354 | } | |
355 | ||
b8e6aad9 ILT |
356 | // Do a simple relocation using a Symbol_value with the addend in |
357 | // the section contents. VALSIZE is the size of the value to | |
358 | // relocate. | |
359 | template<int valsize> | |
360 | static inline void | |
361 | rel(unsigned char* view, | |
6fa2a40b | 362 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
363 | const Symbol_value<size>* psymval) |
364 | { | |
365 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
366 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
367 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
368 | x = psymval->value(object, x); | |
369 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
370 | } | |
371 | ||
2c339f71 DK |
372 | // Like the above but for relocs at unaligned addresses. |
373 | template<int valsize> | |
374 | static inline void | |
375 | rel_unaligned(unsigned char* view, | |
376 | const Sized_relobj_file<size, big_endian>* object, | |
377 | const Symbol_value<size>* psymval) | |
378 | { | |
379 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
380 | Valtype; | |
381 | Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); | |
382 | x = psymval->value(object, x); | |
383 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, x); | |
384 | } | |
385 | ||
d830e0e0 ILT |
386 | // Do a simple relocation with the addend in the relocation. |
387 | // VALSIZE is the size of the value. | |
388 | template<int valsize> | |
389 | static inline void | |
390 | rela(unsigned char* view, | |
391 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
392 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
393 | { | |
394 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
395 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
396 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend); | |
397 | } | |
398 | ||
399 | // Do a simple relocation using a symbol value with the addend in | |
400 | // the relocation. VALSIZE is the size of the value. | |
401 | template<int valsize> | |
402 | static inline void | |
403 | rela(unsigned char* view, | |
6fa2a40b | 404 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
405 | const Symbol_value<size>* psymval, |
406 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend) | |
407 | { | |
408 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
409 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
410 | Valtype x = psymval->value(object, addend); | |
411 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x); | |
412 | } | |
413 | ||
92e059d8 ILT |
414 | // Do a simple PC relative relocation with the addend in the section |
415 | // contents. VALSIZE is the size of the value. | |
416 | template<int valsize> | |
417 | static inline void | |
f6ce93d6 ILT |
418 | pcrel(unsigned char* view, |
419 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
92e059d8 ILT |
420 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
421 | { | |
f6ce93d6 | 422 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
92e059d8 | 423 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
f6ce93d6 ILT |
424 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); |
425 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
92e059d8 ILT |
426 | } |
427 | ||
29ab395d DK |
428 | // Like the above but for relocs at unaligned addresses. |
429 | template<int valsize> | |
430 | static inline void | |
431 | pcrel_unaligned(unsigned char* view, | |
432 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
433 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
434 | { | |
435 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
436 | Valtype x = elfcpp::Swap_unaligned<valsize, big_endian>::readval(view); | |
437 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, | |
438 | x + value - address); | |
439 | } | |
440 | ||
b8e6aad9 ILT |
441 | // Do a simple PC relative relocation with a Symbol_value with the |
442 | // addend in the section contents. VALSIZE is the size of the | |
443 | // value. | |
444 | template<int valsize> | |
445 | static inline void | |
446 | pcrel(unsigned char* view, | |
6fa2a40b | 447 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
448 | const Symbol_value<size>* psymval, |
449 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
450 | { | |
451 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
452 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
453 | Valtype x = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
454 | x = psymval->value(object, x); | |
455 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
456 | } | |
457 | ||
d830e0e0 ILT |
458 | // Do a simple PC relative relocation with the addend in the |
459 | // relocation. VALSIZE is the size of the value. | |
460 | template<int valsize> | |
461 | static inline void | |
462 | pcrela(unsigned char* view, | |
463 | typename elfcpp::Swap<valsize, big_endian>::Valtype value, | |
464 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
465 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
466 | { | |
467 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
468 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
469 | elfcpp::Swap<valsize, big_endian>::writeval(wv, value + addend - address); | |
470 | } | |
471 | ||
472 | // Do a simple PC relative relocation with a Symbol_value with the | |
473 | // addend in the relocation. VALSIZE is the size of the value. | |
474 | template<int valsize> | |
475 | static inline void | |
476 | pcrela(unsigned char* view, | |
6fa2a40b | 477 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
478 | const Symbol_value<size>* psymval, |
479 | typename elfcpp::Swap<valsize, big_endian>::Valtype addend, | |
480 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
481 | { | |
482 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
483 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
484 | Valtype x = psymval->value(object, addend); | |
485 | elfcpp::Swap<valsize, big_endian>::writeval(wv, x - address); | |
486 | } | |
487 | ||
92e059d8 ILT |
488 | typedef Relocate_functions<size, big_endian> This; |
489 | ||
490 | public: | |
b8e6aad9 ILT |
491 | // Do a simple 8-bit REL relocation with the addend in the section |
492 | // contents. | |
92e059d8 ILT |
493 | static inline void |
494 | rel8(unsigned char* view, unsigned char value) | |
b8e6aad9 ILT |
495 | { This::template rel<8>(view, value); } |
496 | ||
497 | static inline void | |
498 | rel8(unsigned char* view, | |
6fa2a40b | 499 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
500 | const Symbol_value<size>* psymval) |
501 | { This::template rel<8>(view, object, psymval); } | |
92e059d8 | 502 | |
d830e0e0 ILT |
503 | // Do an 8-bit RELA relocation with the addend in the relocation. |
504 | static inline void | |
5b3463d9 | 505 | rela8(unsigned char* view, unsigned char value, unsigned char addend) |
d830e0e0 ILT |
506 | { This::template rela<8>(view, value, addend); } |
507 | ||
508 | static inline void | |
5b3463d9 | 509 | rela8(unsigned char* view, |
6fa2a40b | 510 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
511 | const Symbol_value<size>* psymval, |
512 | unsigned char addend) | |
513 | { This::template rela<8>(view, object, psymval, addend); } | |
514 | ||
92e059d8 | 515 | // Do a simple 8-bit PC relative relocation with the addend in the |
b8e6aad9 | 516 | // section contents. |
92e059d8 ILT |
517 | static inline void |
518 | pcrel8(unsigned char* view, unsigned char value, | |
519 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
520 | { This::template pcrel<8>(view, value, address); } |
521 | ||
522 | static inline void | |
523 | pcrel8(unsigned char* view, | |
6fa2a40b | 524 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
525 | const Symbol_value<size>* psymval, |
526 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
527 | { This::template pcrel<8>(view, object, psymval, address); } | |
92e059d8 | 528 | |
d830e0e0 ILT |
529 | // Do a simple 8-bit PC relative RELA relocation with the addend in |
530 | // the reloc. | |
531 | static inline void | |
532 | pcrela8(unsigned char* view, unsigned char value, unsigned char addend, | |
533 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
534 | { This::template pcrela<8>(view, value, addend, address); } | |
535 | ||
536 | static inline void | |
537 | pcrela8(unsigned char* view, | |
6fa2a40b | 538 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
539 | const Symbol_value<size>* psymval, |
540 | unsigned char addend, | |
541 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
542 | { This::template pcrela<8>(view, object, psymval, addend, address); } | |
543 | ||
b8e6aad9 ILT |
544 | // Do a simple 16-bit REL relocation with the addend in the section |
545 | // contents. | |
92e059d8 ILT |
546 | static inline void |
547 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
b8e6aad9 ILT |
548 | { This::template rel<16>(view, value); } |
549 | ||
550 | static inline void | |
551 | rel16(unsigned char* view, | |
6fa2a40b | 552 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
553 | const Symbol_value<size>* psymval) |
554 | { This::template rel<16>(view, object, psymval); } | |
92e059d8 | 555 | |
d830e0e0 ILT |
556 | // Do an 16-bit RELA relocation with the addend in the relocation. |
557 | static inline void | |
558 | rela16(unsigned char* view, elfcpp::Elf_Half value, elfcpp::Elf_Half addend) | |
559 | { This::template rela<16>(view, value, addend); } | |
560 | ||
561 | static inline void | |
562 | rela16(unsigned char* view, | |
6fa2a40b | 563 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
564 | const Symbol_value<size>* psymval, |
565 | elfcpp::Elf_Half addend) | |
566 | { This::template rela<16>(view, object, psymval, addend); } | |
567 | ||
d830e0e0 | 568 | // Do a simple 16-bit PC relative REL relocation with the addend in |
b8e6aad9 | 569 | // the section contents. |
92e059d8 | 570 | static inline void |
d830e0e0 | 571 | pcrel16(unsigned char* view, elfcpp::Elf_Half value, |
92e059d8 | 572 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
573 | { This::template pcrel<16>(view, value, address); } |
574 | ||
575 | static inline void | |
576 | pcrel16(unsigned char* view, | |
6fa2a40b | 577 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
578 | const Symbol_value<size>* psymval, |
579 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
580 | { This::template pcrel<16>(view, object, psymval, address); } | |
92e059d8 | 581 | |
d830e0e0 ILT |
582 | // Do a simple 16-bit PC relative RELA relocation with the addend in |
583 | // the reloc. | |
584 | static inline void | |
585 | pcrela16(unsigned char* view, elfcpp::Elf_Half value, | |
586 | elfcpp::Elf_Half addend, | |
587 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
588 | { This::template pcrela<16>(view, value, addend, address); } | |
589 | ||
590 | static inline void | |
591 | pcrela16(unsigned char* view, | |
6fa2a40b | 592 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
593 | const Symbol_value<size>* psymval, |
594 | elfcpp::Elf_Half addend, | |
595 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
596 | { This::template pcrela<16>(view, object, psymval, addend, address); } | |
597 | ||
92e059d8 ILT |
598 | // Do a simple 32-bit REL relocation with the addend in the section |
599 | // contents. | |
600 | static inline void | |
601 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
b8e6aad9 ILT |
602 | { This::template rel<32>(view, value); } |
603 | ||
29ab395d DK |
604 | // Like above but for relocs at unaligned addresses. |
605 | static inline void | |
606 | rel32_unaligned(unsigned char* view, elfcpp::Elf_Word value) | |
607 | { This::template rel_unaligned<32>(view, value); } | |
608 | ||
b8e6aad9 ILT |
609 | static inline void |
610 | rel32(unsigned char* view, | |
6fa2a40b | 611 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
612 | const Symbol_value<size>* psymval) |
613 | { This::template rel<32>(view, object, psymval); } | |
92e059d8 | 614 | |
2c339f71 DK |
615 | // Like above but for relocs at unaligned addresses. |
616 | static inline void | |
617 | rel32_unaligned(unsigned char* view, | |
618 | const Sized_relobj_file<size, big_endian>* object, | |
619 | const Symbol_value<size>* psymval) | |
620 | { This::template rel_unaligned<32>(view, object, psymval); } | |
621 | ||
d830e0e0 ILT |
622 | // Do an 32-bit RELA relocation with the addend in the relocation. |
623 | static inline void | |
624 | rela32(unsigned char* view, elfcpp::Elf_Word value, elfcpp::Elf_Word addend) | |
625 | { This::template rela<32>(view, value, addend); } | |
626 | ||
627 | static inline void | |
628 | rela32(unsigned char* view, | |
6fa2a40b | 629 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
630 | const Symbol_value<size>* psymval, |
631 | elfcpp::Elf_Word addend) | |
632 | { This::template rela<32>(view, object, psymval, addend); } | |
633 | ||
92e059d8 ILT |
634 | // Do a simple 32-bit PC relative REL relocation with the addend in |
635 | // the section contents. | |
636 | static inline void | |
637 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
638 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
b8e6aad9 ILT |
639 | { This::template pcrel<32>(view, value, address); } |
640 | ||
29ab395d DK |
641 | // Unaligned version of the above. |
642 | static inline void | |
643 | pcrel32_unaligned(unsigned char* view, elfcpp::Elf_Word value, | |
644 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
645 | { This::template pcrel_unaligned<32>(view, value, address); } | |
646 | ||
b8e6aad9 ILT |
647 | static inline void |
648 | pcrel32(unsigned char* view, | |
6fa2a40b | 649 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
650 | const Symbol_value<size>* psymval, |
651 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
652 | { This::template pcrel<32>(view, object, psymval, address); } | |
92e059d8 | 653 | |
d830e0e0 ILT |
654 | // Do a simple 32-bit PC relative RELA relocation with the addend in |
655 | // the relocation. | |
656 | static inline void | |
657 | pcrela32(unsigned char* view, elfcpp::Elf_Word value, | |
658 | elfcpp::Elf_Word addend, | |
659 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
660 | { This::template pcrela<32>(view, value, addend, address); } | |
661 | ||
662 | static inline void | |
663 | pcrela32(unsigned char* view, | |
6fa2a40b | 664 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
665 | const Symbol_value<size>* psymval, |
666 | elfcpp::Elf_Word addend, | |
667 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
668 | { This::template pcrela<32>(view, object, psymval, addend, address); } | |
669 | ||
92e059d8 ILT |
670 | // Do a simple 64-bit REL relocation with the addend in the section |
671 | // contents. | |
672 | static inline void | |
f6ce93d6 | 673 | rel64(unsigned char* view, elfcpp::Elf_Xword value) |
b8e6aad9 ILT |
674 | { This::template rel<64>(view, value); } |
675 | ||
676 | static inline void | |
677 | rel64(unsigned char* view, | |
6fa2a40b | 678 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
679 | const Symbol_value<size>* psymval) |
680 | { This::template rel<64>(view, object, psymval); } | |
92e059d8 | 681 | |
d830e0e0 ILT |
682 | // Do a 64-bit RELA relocation with the addend in the relocation. |
683 | static inline void | |
684 | rela64(unsigned char* view, elfcpp::Elf_Xword value, | |
685 | elfcpp::Elf_Xword addend) | |
686 | { This::template rela<64>(view, value, addend); } | |
687 | ||
688 | static inline void | |
689 | rela64(unsigned char* view, | |
6fa2a40b | 690 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
691 | const Symbol_value<size>* psymval, |
692 | elfcpp::Elf_Xword addend) | |
693 | { This::template rela<64>(view, object, psymval, addend); } | |
694 | ||
92e059d8 ILT |
695 | // Do a simple 64-bit PC relative REL relocation with the addend in |
696 | // the section contents. | |
697 | static inline void | |
f6ce93d6 | 698 | pcrel64(unsigned char* view, elfcpp::Elf_Xword value, |
92e059d8 | 699 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
b8e6aad9 ILT |
700 | { This::template pcrel<64>(view, value, address); } |
701 | ||
702 | static inline void | |
703 | pcrel64(unsigned char* view, | |
6fa2a40b | 704 | const Sized_relobj_file<size, big_endian>* object, |
b8e6aad9 ILT |
705 | const Symbol_value<size>* psymval, |
706 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
707 | { This::template pcrel<64>(view, object, psymval, address); } | |
d830e0e0 ILT |
708 | |
709 | // Do a simple 64-bit PC relative RELA relocation with the addend in | |
710 | // the relocation. | |
711 | static inline void | |
712 | pcrela64(unsigned char* view, elfcpp::Elf_Xword value, | |
713 | elfcpp::Elf_Xword addend, | |
714 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
715 | { This::template pcrela<64>(view, value, addend, address); } | |
716 | ||
717 | static inline void | |
718 | pcrela64(unsigned char* view, | |
6fa2a40b | 719 | const Sized_relobj_file<size, big_endian>* object, |
d830e0e0 ILT |
720 | const Symbol_value<size>* psymval, |
721 | elfcpp::Elf_Xword addend, | |
722 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
723 | { This::template pcrela<64>(view, object, psymval, addend, address); } | |
5a6f7e2d ILT |
724 | }; |
725 | ||
bef2b434 ILT |
726 | // Integer manipulation functions used by various targets when |
727 | // performing relocations. | |
728 | ||
729 | template<int bits> | |
730 | class Bits | |
731 | { | |
732 | public: | |
733 | // Sign extend an n-bit unsigned integer stored in a uint32_t into | |
2c175ebc | 734 | // an int32_t. BITS must be between 1 and 32. |
bef2b434 ILT |
735 | static inline int32_t |
736 | sign_extend32(uint32_t val) | |
737 | { | |
2c175ebc | 738 | gold_assert(bits > 0 && bits <= 32); |
bef2b434 ILT |
739 | if (bits == 32) |
740 | return static_cast<int32_t>(val); | |
741 | uint32_t mask = (~static_cast<uint32_t>(0)) >> (32 - bits); | |
742 | val &= mask; | |
743 | uint32_t top_bit = 1U << (bits - 1); | |
744 | int32_t as_signed = static_cast<int32_t>(val); | |
745 | if ((val & top_bit) != 0) | |
746 | as_signed -= static_cast<int32_t>(top_bit * 2); | |
747 | return as_signed; | |
748 | } | |
749 | ||
750 | // Return true if VAL (stored in a uint32_t) has overflowed a signed | |
751 | // value with BITS bits. | |
752 | static inline bool | |
753 | has_overflow32(uint32_t val) | |
754 | { | |
2c175ebc | 755 | gold_assert(bits > 0 && bits <= 32); |
bef2b434 ILT |
756 | if (bits == 32) |
757 | return false; | |
758 | int32_t max = (1 << (bits - 1)) - 1; | |
759 | int32_t min = -(1 << (bits - 1)); | |
760 | int32_t as_signed = static_cast<int32_t>(val); | |
761 | return as_signed > max || as_signed < min; | |
762 | } | |
763 | ||
764 | // Return true if VAL (stored in a uint32_t) has overflowed both a | |
765 | // signed and an unsigned value. E.g., | |
766 | // Bits<8>::has_signed_unsigned_overflow32 would check -128 <= VAL < | |
767 | // 255. | |
768 | static inline bool | |
769 | has_signed_unsigned_overflow32(uint32_t val) | |
770 | { | |
2c175ebc | 771 | gold_assert(bits > 0 && bits <= 32); |
bef2b434 ILT |
772 | if (bits == 32) |
773 | return false; | |
774 | int32_t max = static_cast<int32_t>((1U << bits) - 1); | |
775 | int32_t min = -(1 << (bits - 1)); | |
776 | int32_t as_signed = static_cast<int32_t>(val); | |
777 | return as_signed > max || as_signed < min; | |
778 | } | |
779 | ||
780 | // Select bits from A and B using bits in MASK. For each n in | |
781 | // [0..31], the n-th bit in the result is chosen from the n-th bits | |
782 | // of A and B. A zero selects A and a one selects B. | |
783 | static inline uint32_t | |
784 | bit_select32(uint32_t a, uint32_t b, uint32_t mask) | |
785 | { return (a & ~mask) | (b & mask); } | |
786 | ||
787 | // Sign extend an n-bit unsigned integer stored in a uint64_t into | |
2c175ebc | 788 | // an int64_t. BITS must be between 1 and 64. |
bef2b434 ILT |
789 | static inline int64_t |
790 | sign_extend(uint64_t val) | |
791 | { | |
2c175ebc | 792 | gold_assert(bits > 0 && bits <= 64); |
bef2b434 ILT |
793 | if (bits == 64) |
794 | return static_cast<int64_t>(val); | |
795 | uint64_t mask = (~static_cast<uint64_t>(0)) >> (64 - bits); | |
796 | val &= mask; | |
797 | uint64_t top_bit = static_cast<uint64_t>(1) << (bits - 1); | |
798 | int64_t as_signed = static_cast<int64_t>(val); | |
799 | if ((val & top_bit) != 0) | |
800 | as_signed -= static_cast<int64_t>(top_bit * 2); | |
801 | return as_signed; | |
802 | } | |
803 | ||
804 | // Return true if VAL (stored in a uint64_t) has overflowed a signed | |
805 | // value with BITS bits. | |
806 | static inline bool | |
807 | has_overflow(uint64_t val) | |
808 | { | |
2c175ebc | 809 | gold_assert(bits > 0 && bits <= 64); |
bef2b434 ILT |
810 | if (bits == 64) |
811 | return false; | |
812 | int64_t max = (static_cast<int64_t>(1) << (bits - 1)) - 1; | |
813 | int64_t min = -(static_cast<int64_t>(1) << (bits - 1)); | |
814 | int64_t as_signed = static_cast<int64_t>(val); | |
815 | return as_signed > max || as_signed < min; | |
816 | } | |
817 | ||
818 | // Return true if VAL (stored in a uint64_t) has overflowed both a | |
819 | // signed and an unsigned value. E.g., | |
820 | // Bits<8>::has_signed_unsigned_overflow would check -128 <= VAL < | |
821 | // 255. | |
822 | static inline bool | |
823 | has_signed_unsigned_overflow64(uint64_t val) | |
824 | { | |
2c175ebc | 825 | gold_assert(bits > 0 && bits <= 64); |
bef2b434 ILT |
826 | if (bits == 64) |
827 | return false; | |
828 | int64_t max = static_cast<int64_t>((static_cast<uint64_t>(1) << bits) - 1); | |
829 | int64_t min = -(static_cast<int64_t>(1) << (bits - 1)); | |
830 | int64_t as_signed = static_cast<int64_t>(val); | |
831 | return as_signed > max || as_signed < min; | |
832 | } | |
833 | ||
834 | // Select bits from A and B using bits in MASK. For each n in | |
835 | // [0..31], the n-th bit in the result is chosen from the n-th bits | |
836 | // of A and B. A zero selects A and a one selects B. | |
837 | static inline uint64_t | |
838 | bit_select64(uint64_t a, uint64_t b, uint64_t mask) | |
839 | { return (a & ~mask) | (b & mask); } | |
840 | }; | |
841 | ||
730cdc88 ILT |
842 | // Track relocations while reading a section. This lets you ask for |
843 | // the relocation at a certain offset, and see how relocs occur | |
844 | // between points of interest. | |
845 | ||
846 | template<int size, bool big_endian> | |
847 | class Track_relocs | |
848 | { | |
849 | public: | |
850 | Track_relocs() | |
b696e6d4 | 851 | : prelocs_(NULL), len_(0), pos_(0), reloc_size_(0) |
730cdc88 ILT |
852 | { } |
853 | ||
854 | // Initialize the Track_relocs object. OBJECT is the object holding | |
855 | // the reloc section, RELOC_SHNDX is the section index of the reloc | |
856 | // section, and RELOC_TYPE is the type of the reloc section | |
857 | // (elfcpp::SHT_REL or elfcpp::SHT_RELA). This returns false if | |
858 | // something went wrong. | |
859 | bool | |
b696e6d4 | 860 | initialize(Object* object, unsigned int reloc_shndx, |
730cdc88 ILT |
861 | unsigned int reloc_type); |
862 | ||
863 | // Return the offset in the data section to which the next reloc | |
4dbfafcc | 864 | // applies. This returns -1 if there is no next reloc. |
730cdc88 ILT |
865 | off_t |
866 | next_offset() const; | |
867 | ||
868 | // Return the symbol index of the next reloc. This returns -1U if | |
869 | // there is no next reloc. | |
870 | unsigned int | |
871 | next_symndx() const; | |
872 | ||
4dbfafcc ILT |
873 | // Return the addend of the next reloc. This returns 0 if there is |
874 | // no next reloc. | |
875 | uint64_t | |
876 | next_addend() const; | |
877 | ||
730cdc88 ILT |
878 | // Advance to OFFSET within the data section, and return the number |
879 | // of relocs which would be skipped. | |
880 | int | |
881 | advance(off_t offset); | |
882 | ||
c1027032 CC |
883 | // Checkpoint the current position in the reloc section. |
884 | section_size_type | |
885 | checkpoint() const | |
886 | { return this->pos_; } | |
887 | ||
888 | // Reset the position to CHECKPOINT. | |
889 | void | |
890 | reset(section_size_type checkpoint) | |
891 | { this->pos_ = checkpoint; } | |
892 | ||
730cdc88 | 893 | private: |
b696e6d4 | 894 | // The contents of the input object's reloc section. |
730cdc88 ILT |
895 | const unsigned char* prelocs_; |
896 | // The length of the reloc section. | |
8383303e | 897 | section_size_type len_; |
730cdc88 | 898 | // Our current position in the reloc section. |
8383303e | 899 | section_size_type pos_; |
730cdc88 ILT |
900 | // The size of the relocs in the section. |
901 | int reloc_size_; | |
902 | }; | |
903 | ||
61ba1cf9 ILT |
904 | } // End namespace gold. |
905 | ||
906 | #endif // !defined(GOLD_RELOC_H) |