Commit | Line | Data |
---|---|---|
61ba1cf9 ILT |
1 | // reloc.h -- relocate input files for gold -*- C++ -*- |
2 | ||
3 | #ifndef GOLD_RELOC_H | |
4 | #define GOLD_RELOC_H | |
5 | ||
92e059d8 ILT |
6 | #include <byteswap.h> |
7 | ||
61ba1cf9 ILT |
8 | #include "workqueue.h" |
9 | ||
10 | namespace gold | |
11 | { | |
12 | ||
92e059d8 ILT |
13 | class Object; |
14 | class Read_relocs_data; | |
15 | class Stringpool; | |
16 | ||
17 | // A class to read the relocations for an object file, and then queue | |
18 | // up a task to see if they require any GOT/PLT/COPY relocations in | |
19 | // the symbol table. | |
20 | ||
21 | class Read_relocs : public Task | |
22 | { | |
23 | public: | |
24 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
25 | // unblocked when the Scan_relocs task completes. | |
26 | Read_relocs(const General_options& options, Symbol_table* symtab, | |
27 | Object* object, Task_token* symtab_lock, | |
28 | Task_token* blocker) | |
29 | : options_(options), symtab_(symtab), object_(object), | |
30 | symtab_lock_(symtab_lock), blocker_(blocker) | |
31 | { } | |
32 | ||
33 | // The standard Task methods. | |
34 | ||
35 | Is_runnable_type | |
36 | is_runnable(Workqueue*); | |
37 | ||
38 | Task_locker* | |
39 | locks(Workqueue*); | |
40 | ||
41 | void | |
42 | run(Workqueue*); | |
43 | ||
44 | private: | |
45 | const General_options& options_; | |
46 | Symbol_table* symtab_; | |
47 | Object* object_; | |
48 | Task_token* symtab_lock_; | |
49 | Task_token* blocker_; | |
50 | }; | |
51 | ||
52 | // Scan the relocations for an object to see if they require any | |
53 | // GOT/PLT/COPY relocations. | |
54 | ||
55 | class Scan_relocs : public Task | |
56 | { | |
57 | public: | |
58 | // SYMTAB_LOCK is used to lock the symbol table. BLOCKER should be | |
59 | // unblocked when the task completes. | |
60 | Scan_relocs(const General_options& options, Symbol_table* symtab, | |
61 | Object* object, Read_relocs_data* rd, Task_token* symtab_lock, | |
62 | Task_token* blocker) | |
63 | : options_(options), symtab_(symtab), object_(object), rd_(rd), | |
64 | symtab_lock_(symtab_lock), blocker_(blocker) | |
65 | { } | |
66 | ||
67 | // The standard Task methods. | |
68 | ||
69 | Is_runnable_type | |
70 | is_runnable(Workqueue*); | |
71 | ||
72 | Task_locker* | |
73 | locks(Workqueue*); | |
74 | ||
75 | void | |
76 | run(Workqueue*); | |
77 | ||
78 | private: | |
79 | class Scan_relocs_locker; | |
80 | ||
81 | const General_options& options_; | |
82 | Symbol_table* symtab_; | |
83 | Object* object_; | |
84 | Read_relocs_data* rd_; | |
85 | Task_token* symtab_lock_; | |
86 | Task_token* blocker_; | |
87 | }; | |
88 | ||
89 | // A class to perform all the relocations for an object file. | |
90 | ||
61ba1cf9 ILT |
91 | class Relocate_task : public Task |
92 | { | |
93 | public: | |
94 | Relocate_task(const General_options& options, const Symbol_table* symtab, | |
92e059d8 | 95 | const Layout* layout, Object* object, Output_file* of, |
61ba1cf9 | 96 | Task_token* final_blocker) |
92e059d8 | 97 | : options_(options), symtab_(symtab), layout_(layout), object_(object), |
61ba1cf9 ILT |
98 | of_(of), final_blocker_(final_blocker) |
99 | { } | |
100 | ||
101 | // The standard Task methods. | |
102 | ||
103 | Is_runnable_type | |
104 | is_runnable(Workqueue*); | |
105 | ||
106 | Task_locker* | |
107 | locks(Workqueue*); | |
108 | ||
109 | void | |
110 | run(Workqueue*); | |
111 | ||
112 | private: | |
113 | class Relocate_locker; | |
114 | ||
115 | const General_options& options_; | |
116 | const Symbol_table* symtab_; | |
92e059d8 | 117 | const Layout* layout_; |
61ba1cf9 ILT |
118 | Object* object_; |
119 | Output_file* of_; | |
120 | Task_token* final_blocker_; | |
121 | }; | |
122 | ||
92e059d8 ILT |
123 | // Integer swapping routines used by relocation functions. FIXME: |
124 | // Maybe these should be more general, and/or shared with elfcpp. | |
125 | ||
126 | // Endian simply indicates whether the host is big endian or not, | |
127 | // based on the results of the configure script. | |
128 | ||
129 | struct Endian | |
130 | { | |
131 | public: | |
132 | // Used for template specializations. | |
133 | #ifdef WORDS_BIGENDIAN | |
134 | static const bool host_big_endian = true; | |
135 | #else | |
136 | static const bool host_big_endian = false; | |
137 | #endif | |
138 | }; | |
139 | ||
140 | // Valtype_base is a template based on size (8, 16, 32, 64) which | |
141 | // defines a typedef Valtype for the unsigned integer of the specified | |
142 | // size. | |
143 | ||
144 | template<int size> | |
145 | struct Valtype_base; | |
146 | ||
147 | template<> | |
148 | struct Valtype_base<8> | |
149 | { | |
150 | typedef unsigned char Valtype; | |
151 | }; | |
152 | ||
153 | template<> | |
154 | struct Valtype_base<16> | |
155 | { | |
156 | typedef uint16_t Valtype; | |
157 | }; | |
158 | ||
159 | template<> | |
160 | struct Valtype_base<32> | |
161 | { | |
162 | typedef uint32_t Valtype; | |
163 | }; | |
164 | ||
165 | template<> | |
166 | struct Valtype_base<64> | |
167 | { | |
168 | typedef uint64_t Valtype; | |
169 | }; | |
170 | ||
171 | // Convert_host is a template based on size and on whether the host | |
172 | // and target have the same endianness. It defines the type Valtype, | |
173 | // and defines a function convert_host which takes an argument of type | |
174 | // Valtype and swaps it if the host and target have different | |
175 | // endianness. | |
176 | ||
177 | template<int size, bool same_endian> | |
178 | struct Convert_host; | |
179 | ||
180 | template<int size> | |
181 | struct Convert_host<size, true> | |
182 | { | |
183 | typedef typename Valtype_base<size>::Valtype Valtype; | |
184 | ||
185 | static inline Valtype | |
186 | convert_host(Valtype v) | |
187 | { return v; } | |
188 | }; | |
189 | ||
190 | template<> | |
191 | struct Convert_host<8, false> | |
192 | { | |
193 | typedef Valtype_base<8>::Valtype Valtype; | |
194 | ||
195 | static inline Valtype | |
196 | convert_host(Valtype v) | |
197 | { return v; } | |
198 | }; | |
199 | ||
200 | template<> | |
201 | struct Convert_host<16, false> | |
202 | { | |
203 | typedef Valtype_base<16>::Valtype Valtype; | |
204 | ||
205 | static inline Valtype | |
206 | convert_host(Valtype v) | |
207 | { return bswap_16(v); } | |
208 | }; | |
209 | ||
210 | template<> | |
211 | struct Convert_host<32, false> | |
212 | { | |
213 | typedef Valtype_base<32>::Valtype Valtype; | |
214 | ||
215 | static inline Valtype | |
216 | convert_host(Valtype v) | |
217 | { return bswap_32(v); } | |
218 | }; | |
219 | ||
220 | template<> | |
221 | struct Convert_host<64, false> | |
222 | { | |
223 | typedef Valtype_base<64>::Valtype Valtype; | |
224 | ||
225 | static inline Valtype | |
226 | convert_host(Valtype v) | |
227 | { return bswap_64(v); } | |
228 | }; | |
229 | ||
230 | // Convert is a template based on size and on whether we have a big | |
231 | // endian target. It defines Valtype and convert_host like | |
232 | // Convert_host. That is, it is just like Convert_host except in the | |
233 | // meaning of the second template parameter. | |
234 | ||
235 | template<int size, bool big_endian> | |
236 | struct Convert | |
237 | { | |
238 | typedef typename Valtype_base<size>::Valtype Valtype; | |
239 | ||
240 | static inline Valtype | |
241 | convert_host(Valtype v) | |
242 | { return Convert_host<size, big_endian == Endian::host_big_endian> | |
243 | ::convert_host(v); } | |
244 | }; | |
245 | ||
246 | // Swap is a template based on size and on whether the target is big | |
247 | // endian. It defines the type Valtype and the functions readval and | |
248 | // writeval. The functions read and write values of the appropriate | |
249 | // size out of buffers, swapping them if necessary. | |
250 | ||
251 | template<int size, bool big_endian> | |
252 | struct Swap | |
253 | { | |
254 | typedef typename Valtype_base<size>::Valtype Valtype; | |
255 | ||
256 | static inline Valtype | |
257 | readval(const Valtype* wv) | |
258 | { return Convert<size, big_endian>::convert_host(*wv); } | |
259 | ||
260 | static inline void | |
261 | writeval(Valtype* wv, Valtype v) | |
262 | { *wv = Convert<size, big_endian>::convert_host(v); } | |
263 | }; | |
264 | ||
265 | // Swap_unaligned is a template based on size and on whether the | |
266 | // target is big endian. It defines the type Valtype and the | |
267 | // functions readval_unaligned and writeval_unaligned. The functions | |
268 | // read and write values of the appropriate size out of buffers which | |
269 | // may be misaligned. | |
270 | ||
271 | template<int size, bool big_endian> | |
272 | class Swap_unaligned; | |
273 | ||
274 | template<bool big_endian> | |
275 | class Swap_unaligned<8, big_endian> | |
276 | { | |
277 | public: | |
278 | typedef typename Valtype_base<8>::Valtype Valtype; | |
279 | ||
280 | static inline Valtype | |
281 | readval_unaligned(const unsigned char* wv) | |
282 | { return *wv; } | |
283 | ||
284 | static inline void | |
285 | writeval_unaligned(unsigned char* wv, Valtype v) | |
286 | { *wv = v; } | |
287 | }; | |
288 | ||
289 | template<> | |
290 | class Swap_unaligned<16, false> | |
291 | { | |
292 | public: | |
293 | typedef Valtype_base<16>::Valtype Valtype; | |
294 | ||
295 | static inline Valtype | |
296 | readval_unaligned(const unsigned char* wv) | |
297 | { | |
298 | return (wv[1] << 8) | wv[0]; | |
299 | } | |
300 | ||
301 | static inline void | |
302 | writeval_unaligned(unsigned char* wv, Valtype v) | |
303 | { | |
304 | wv[1] = v >> 8; | |
305 | wv[0] = v; | |
306 | } | |
307 | }; | |
308 | ||
309 | template<> | |
310 | class Swap_unaligned<16, true> | |
311 | { | |
312 | public: | |
313 | typedef Valtype_base<16>::Valtype Valtype; | |
314 | ||
315 | static inline Valtype | |
316 | readval_unaligned(const unsigned char* wv) | |
317 | { | |
318 | return (wv[0] << 8) | wv[1]; | |
319 | } | |
320 | ||
321 | static inline void | |
322 | writeval_unaligned(unsigned char* wv, Valtype v) | |
323 | { | |
324 | wv[0] = v >> 8; | |
325 | wv[1] = v; | |
326 | } | |
327 | }; | |
328 | ||
329 | template<> | |
330 | class Swap_unaligned<32, false> | |
331 | { | |
332 | public: | |
333 | typedef Valtype_base<32>::Valtype Valtype; | |
334 | ||
335 | static inline Valtype | |
336 | readval_unaligned(const unsigned char* wv) | |
337 | { | |
338 | return (wv[3] << 24) | (wv[2] << 16) | (wv[1] << 8) | wv[0]; | |
339 | } | |
340 | ||
341 | static inline void | |
342 | writeval_unaligned(unsigned char* wv, Valtype v) | |
343 | { | |
344 | wv[3] = v >> 24; | |
345 | wv[2] = v >> 16; | |
346 | wv[1] = v >> 8; | |
347 | wv[0] = v; | |
348 | } | |
349 | }; | |
350 | ||
351 | template<> | |
352 | class Swap_unaligned<32, true> | |
353 | { | |
354 | public: | |
355 | typedef Valtype_base<32>::Valtype Valtype; | |
356 | ||
357 | static inline Valtype | |
358 | readval_unaligned(const unsigned char* wv) | |
359 | { | |
360 | return (wv[0] << 24) | (wv[1] << 16) | (wv[2] << 8) | wv[3]; | |
361 | } | |
362 | ||
363 | static inline void | |
364 | writeval_unaligned(unsigned char* wv, Valtype v) | |
365 | { | |
366 | wv[0] = v >> 24; | |
367 | wv[1] = v >> 16; | |
368 | wv[2] = v >> 8; | |
369 | wv[3] = v; | |
370 | } | |
371 | }; | |
372 | ||
373 | template<> | |
374 | class Swap_unaligned<64, false> | |
375 | { | |
376 | public: | |
377 | typedef Valtype_base<64>::Valtype Valtype; | |
378 | ||
379 | static inline Valtype | |
380 | readval_unaligned(const unsigned char* wv) | |
381 | { | |
382 | return ((static_cast<Valtype>(wv[7]) << 56) | |
383 | | (static_cast<Valtype>(wv[6]) << 48) | |
384 | | (static_cast<Valtype>(wv[5]) << 40) | |
385 | | (static_cast<Valtype>(wv[4]) << 32) | |
386 | | (static_cast<Valtype>(wv[3]) << 24) | |
387 | | (static_cast<Valtype>(wv[2]) << 16) | |
388 | | (static_cast<Valtype>(wv[1]) << 8) | |
389 | | static_cast<Valtype>(wv[0])); | |
390 | } | |
391 | ||
392 | static inline void | |
393 | writeval_unaligned(unsigned char* wv, Valtype v) | |
394 | { | |
395 | wv[7] = v >> 56; | |
396 | wv[6] = v >> 48; | |
397 | wv[5] = v >> 40; | |
398 | wv[4] = v >> 32; | |
399 | wv[3] = v >> 24; | |
400 | wv[2] = v >> 16; | |
401 | wv[1] = v >> 8; | |
402 | wv[0] = v; | |
403 | } | |
404 | }; | |
405 | ||
406 | template<> | |
407 | class Swap_unaligned<64, true> | |
408 | { | |
409 | public: | |
410 | typedef Valtype_base<64>::Valtype Valtype; | |
411 | ||
412 | static inline Valtype | |
413 | readval_unaligned(const unsigned char* wv) | |
414 | { | |
415 | return ((static_cast<Valtype>(wv[0]) << 56) | |
416 | | (static_cast<Valtype>(wv[1]) << 48) | |
417 | | (static_cast<Valtype>(wv[2]) << 40) | |
418 | | (static_cast<Valtype>(wv[3]) << 32) | |
419 | | (static_cast<Valtype>(wv[4]) << 24) | |
420 | | (static_cast<Valtype>(wv[5]) << 16) | |
421 | | (static_cast<Valtype>(wv[6]) << 8) | |
422 | | static_cast<Valtype>(wv[7])); | |
423 | } | |
424 | ||
425 | static inline void | |
426 | writeval_unaligned(unsigned char* wv, Valtype v) | |
427 | { | |
428 | wv[7] = v >> 56; | |
429 | wv[6] = v >> 48; | |
430 | wv[5] = v >> 40; | |
431 | wv[4] = v >> 32; | |
432 | wv[3] = v >> 24; | |
433 | wv[2] = v >> 16; | |
434 | wv[1] = v >> 8; | |
435 | wv[0] = v; | |
436 | } | |
437 | }; | |
438 | ||
439 | // Standard relocation routines which are used on many targets. Here | |
440 | // SIZE and BIG_ENDIAN refer to the target, not the relocation type. | |
441 | ||
442 | template<int size, bool big_endian> | |
443 | class Relocate_functions | |
444 | { | |
445 | private: | |
446 | // Do a simple relocation with the addend in the section contents. | |
447 | // VALSIZE is the size of the value. | |
448 | template<int valsize> | |
449 | static inline void | |
450 | rel(unsigned char* view, typename Swap<valsize, big_endian>::Valtype value) | |
451 | { | |
452 | typedef typename Swap<valsize, big_endian>::Valtype Valtype; | |
453 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
454 | Valtype x = Swap<valsize, big_endian>::readval(wv); | |
455 | Swap<valsize, big_endian>::writeval(wv, x + value); | |
456 | } | |
457 | ||
458 | // Do a simple PC relative relocation with the addend in the section | |
459 | // contents. VALSIZE is the size of the value. | |
460 | template<int valsize> | |
461 | static inline void | |
462 | pcrel(unsigned char* view, typename Swap<valsize, big_endian>::Valtype value, | |
463 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
464 | { | |
465 | typedef typename Swap<valsize, big_endian>::Valtype Valtype; | |
466 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
467 | Valtype x = Swap<valsize, big_endian>::readval(wv); | |
468 | Swap<valsize, big_endian>::writeval(wv, x + value - address); | |
469 | } | |
470 | ||
471 | typedef Relocate_functions<size, big_endian> This; | |
472 | ||
473 | public: | |
474 | // Do a simple 8-bit REL relocation with the addend in the object | |
475 | // file data. | |
476 | static inline void | |
477 | rel8(unsigned char* view, unsigned char value) | |
478 | { | |
479 | This::template rel<8>(view, value); | |
480 | } | |
481 | ||
482 | // Do a simple 8-bit PC relative relocation with the addend in the | |
483 | // object file data. | |
484 | static inline void | |
485 | pcrel8(unsigned char* view, unsigned char value, | |
486 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
487 | { | |
488 | This::template pcrel<8>(view, value, address); | |
489 | } | |
490 | ||
491 | // Do a simple 16-bit REL relocation with the addend in the object | |
492 | // file data. | |
493 | static inline void | |
494 | rel16(unsigned char* view, elfcpp::Elf_Half value) | |
495 | { | |
496 | This::template rel<16>(view, value); | |
497 | } | |
498 | ||
499 | // Do a simple 32-bit PC relative REL relocation with the addend in | |
500 | // the object file data. | |
501 | static inline void | |
502 | pcrel16(unsigned char* view, elfcpp::Elf_Word value, | |
503 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
504 | { | |
505 | This::template pcrel<16>(view, value, address); | |
506 | } | |
507 | ||
508 | // Do a simple 32-bit REL relocation with the addend in the section | |
509 | // contents. | |
510 | static inline void | |
511 | rel32(unsigned char* view, elfcpp::Elf_Word value) | |
512 | { | |
513 | This::template rel<32>(view, value); | |
514 | } | |
515 | ||
516 | // Do a simple 32-bit PC relative REL relocation with the addend in | |
517 | // the section contents. | |
518 | static inline void | |
519 | pcrel32(unsigned char* view, elfcpp::Elf_Word value, | |
520 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
521 | { | |
522 | This::template pcrel<32>(view, value, address); | |
523 | } | |
524 | ||
525 | // Do a simple 64-bit REL relocation with the addend in the section | |
526 | // contents. | |
527 | static inline void | |
528 | rel64(unsigned char* view, elfcpp::Elf_Word value) | |
529 | { | |
530 | This::template rel<64>(view, value); | |
531 | } | |
532 | ||
533 | // Do a simple 64-bit PC relative REL relocation with the addend in | |
534 | // the section contents. | |
535 | static inline void | |
536 | pcrel64(unsigned char* view, elfcpp::Elf_Word value, | |
537 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
538 | { | |
539 | This::template pcrel<64>(view, value, address); | |
540 | } | |
541 | }; | |
542 | ||
61ba1cf9 ILT |
543 | } // End namespace gold. |
544 | ||
545 | #endif // !defined(GOLD_RELOC_H) |