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4a657b0d DK |
1 | // arm.cc -- arm target support for gold. |
2 | ||
3 | // Copyright 2009 Free Software Foundation, Inc. | |
4 | // Written by Doug Kwan <dougkwan@google.com> based on the i386 code | |
5 | // by Ian Lance Taylor <iant@google.com>. | |
b569affa DK |
6 | // This file also contains borrowed and adapted code from |
7 | // bfd/elf32-arm.c. | |
4a657b0d DK |
8 | |
9 | // This file is part of gold. | |
10 | ||
11 | // This program is free software; you can redistribute it and/or modify | |
12 | // it under the terms of the GNU General Public License as published by | |
13 | // the Free Software Foundation; either version 3 of the License, or | |
14 | // (at your option) any later version. | |
15 | ||
16 | // This program is distributed in the hope that it will be useful, | |
17 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | // GNU General Public License for more details. | |
20 | ||
21 | // You should have received a copy of the GNU General Public License | |
22 | // along with this program; if not, write to the Free Software | |
23 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
24 | // MA 02110-1301, USA. | |
25 | ||
26 | #include "gold.h" | |
27 | ||
28 | #include <cstring> | |
29 | #include <limits> | |
30 | #include <cstdio> | |
31 | #include <string> | |
32 | ||
33 | #include "elfcpp.h" | |
34 | #include "parameters.h" | |
35 | #include "reloc.h" | |
36 | #include "arm.h" | |
37 | #include "object.h" | |
38 | #include "symtab.h" | |
39 | #include "layout.h" | |
40 | #include "output.h" | |
41 | #include "copy-relocs.h" | |
42 | #include "target.h" | |
43 | #include "target-reloc.h" | |
44 | #include "target-select.h" | |
45 | #include "tls.h" | |
46 | #include "defstd.h" | |
f345227a | 47 | #include "gc.h" |
4a657b0d DK |
48 | |
49 | namespace | |
50 | { | |
51 | ||
52 | using namespace gold; | |
53 | ||
94cdfcff DK |
54 | template<bool big_endian> |
55 | class Output_data_plt_arm; | |
56 | ||
b569affa DK |
57 | template<bool big_endian> |
58 | class Target_arm; | |
59 | ||
60 | // For convenience. | |
61 | typedef elfcpp::Elf_types<32>::Elf_Addr Arm_address; | |
62 | ||
63 | // Maximum branch offsets for ARM, THUMB and THUMB2. | |
64 | const int32_t ARM_MAX_FWD_BRANCH_OFFSET = ((((1 << 23) - 1) << 2) + 8); | |
65 | const int32_t ARM_MAX_BWD_BRANCH_OFFSET = ((-((1 << 23) << 2)) + 8); | |
66 | const int32_t THM_MAX_FWD_BRANCH_OFFSET = ((1 << 22) -2 + 4); | |
67 | const int32_t THM_MAX_BWD_BRANCH_OFFSET = (-(1 << 22) + 4); | |
68 | const int32_t THM2_MAX_FWD_BRANCH_OFFSET = (((1 << 24) - 2) + 4); | |
69 | const int32_t THM2_MAX_BWD_BRANCH_OFFSET = (-(1 << 24) + 4); | |
70 | ||
4a657b0d DK |
71 | // The arm target class. |
72 | // | |
73 | // This is a very simple port of gold for ARM-EABI. It is intended for | |
74 | // supporting Android only for the time being. Only these relocation types | |
75 | // are supported. | |
76 | // | |
77 | // R_ARM_NONE | |
78 | // R_ARM_ABS32 | |
be8fcb75 ILT |
79 | // R_ARM_ABS32_NOI |
80 | // R_ARM_ABS16 | |
81 | // R_ARM_ABS12 | |
82 | // R_ARM_ABS8 | |
83 | // R_ARM_THM_ABS5 | |
84 | // R_ARM_BASE_ABS | |
4a657b0d DK |
85 | // R_ARM_REL32 |
86 | // R_ARM_THM_CALL | |
87 | // R_ARM_COPY | |
88 | // R_ARM_GLOB_DAT | |
89 | // R_ARM_BASE_PREL | |
90 | // R_ARM_JUMP_SLOT | |
91 | // R_ARM_RELATIVE | |
92 | // R_ARM_GOTOFF32 | |
93 | // R_ARM_GOT_BREL | |
7f5309a5 | 94 | // R_ARM_GOT_PREL |
4a657b0d DK |
95 | // R_ARM_PLT32 |
96 | // R_ARM_CALL | |
97 | // R_ARM_JUMP24 | |
98 | // R_ARM_TARGET1 | |
99 | // R_ARM_PREL31 | |
7f5309a5 | 100 | // R_ARM_ABS8 |
fd3c5f0b ILT |
101 | // R_ARM_MOVW_ABS_NC |
102 | // R_ARM_MOVT_ABS | |
103 | // R_ARM_THM_MOVW_ABS_NC | |
c2a122b6 ILT |
104 | // R_ARM_THM_MOVT_ABS |
105 | // R_ARM_MOVW_PREL_NC | |
106 | // R_ARM_MOVT_PREL | |
107 | // R_ARM_THM_MOVW_PREL_NC | |
108 | // R_ARM_THM_MOVT_PREL | |
4a657b0d | 109 | // |
4a657b0d | 110 | // TODOs: |
11af873f DK |
111 | // - Generate various branch stubs. |
112 | // - Support interworking. | |
113 | // - Define section symbols __exidx_start and __exidx_stop. | |
4a657b0d | 114 | // - Support more relocation types as needed. |
94cdfcff DK |
115 | // - Make PLTs more flexible for different architecture features like |
116 | // Thumb-2 and BE8. | |
11af873f | 117 | // There are probably a lot more. |
4a657b0d | 118 | |
b569affa DK |
119 | // Instruction template class. This class is similar to the insn_sequence |
120 | // struct in bfd/elf32-arm.c. | |
121 | ||
122 | class Insn_template | |
123 | { | |
124 | public: | |
125 | // Types of instruction templates. | |
126 | enum Type | |
127 | { | |
128 | THUMB16_TYPE = 1, | |
129 | THUMB32_TYPE, | |
130 | ARM_TYPE, | |
131 | DATA_TYPE | |
132 | }; | |
133 | ||
134 | // Factory methods to create instrunction templates in different formats. | |
135 | ||
136 | static const Insn_template | |
137 | thumb16_insn(uint32_t data) | |
138 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 0); } | |
139 | ||
140 | // A bit of a hack. A Thumb conditional branch, in which the proper | |
141 | // condition is inserted when we build the stub. | |
142 | static const Insn_template | |
143 | thumb16_bcond_insn(uint32_t data) | |
144 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 1); } | |
145 | ||
146 | static const Insn_template | |
147 | thumb32_insn(uint32_t data) | |
148 | { return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_NONE, 0); } | |
149 | ||
150 | static const Insn_template | |
151 | thumb32_b_insn(uint32_t data, int reloc_addend) | |
152 | { | |
153 | return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_THM_JUMP24, | |
154 | reloc_addend); | |
155 | } | |
156 | ||
157 | static const Insn_template | |
158 | arm_insn(uint32_t data) | |
159 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_NONE, 0); } | |
160 | ||
161 | static const Insn_template | |
162 | arm_rel_insn(unsigned data, int reloc_addend) | |
163 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_JUMP24, reloc_addend); } | |
164 | ||
165 | static const Insn_template | |
166 | data_word(unsigned data, unsigned int r_type, int reloc_addend) | |
167 | { return Insn_template(data, DATA_TYPE, r_type, reloc_addend); } | |
168 | ||
169 | // Accessors. This class is used for read-only objects so no modifiers | |
170 | // are provided. | |
171 | ||
172 | uint32_t | |
173 | data() const | |
174 | { return this->data_; } | |
175 | ||
176 | // Return the instruction sequence type of this. | |
177 | Type | |
178 | type() const | |
179 | { return this->type_; } | |
180 | ||
181 | // Return the ARM relocation type of this. | |
182 | unsigned int | |
183 | r_type() const | |
184 | { return this->r_type_; } | |
185 | ||
186 | int32_t | |
187 | reloc_addend() const | |
188 | { return this->reloc_addend_; } | |
189 | ||
190 | // Return size of instrunction template in bytes. | |
191 | size_t | |
192 | size() const; | |
193 | ||
194 | // Return byte-alignment of instrunction template. | |
195 | unsigned | |
196 | alignment() const; | |
197 | ||
198 | private: | |
199 | // We make the constructor private to ensure that only the factory | |
200 | // methods are used. | |
201 | inline | |
202 | Insn_template(unsigned data, Type type, unsigned int r_type, int reloc_addend) | |
203 | : data_(data), type_(type), r_type_(r_type), reloc_addend_(reloc_addend) | |
204 | { } | |
205 | ||
206 | // Instruction specific data. This is used to store information like | |
207 | // some of the instruction bits. | |
208 | uint32_t data_; | |
209 | // Instruction template type. | |
210 | Type type_; | |
211 | // Relocation type if there is a relocation or R_ARM_NONE otherwise. | |
212 | unsigned int r_type_; | |
213 | // Relocation addend. | |
214 | int32_t reloc_addend_; | |
215 | }; | |
216 | ||
217 | // Macro for generating code to stub types. One entry per long/short | |
218 | // branch stub | |
219 | ||
220 | #define DEF_STUBS \ | |
221 | DEF_STUB(long_branch_any_any) \ | |
222 | DEF_STUB(long_branch_v4t_arm_thumb) \ | |
223 | DEF_STUB(long_branch_thumb_only) \ | |
224 | DEF_STUB(long_branch_v4t_thumb_thumb) \ | |
225 | DEF_STUB(long_branch_v4t_thumb_arm) \ | |
226 | DEF_STUB(short_branch_v4t_thumb_arm) \ | |
227 | DEF_STUB(long_branch_any_arm_pic) \ | |
228 | DEF_STUB(long_branch_any_thumb_pic) \ | |
229 | DEF_STUB(long_branch_v4t_thumb_thumb_pic) \ | |
230 | DEF_STUB(long_branch_v4t_arm_thumb_pic) \ | |
231 | DEF_STUB(long_branch_v4t_thumb_arm_pic) \ | |
232 | DEF_STUB(long_branch_thumb_only_pic) \ | |
233 | DEF_STUB(a8_veneer_b_cond) \ | |
234 | DEF_STUB(a8_veneer_b) \ | |
235 | DEF_STUB(a8_veneer_bl) \ | |
236 | DEF_STUB(a8_veneer_blx) | |
237 | ||
238 | // Stub types. | |
239 | ||
240 | #define DEF_STUB(x) arm_stub_##x, | |
241 | typedef enum | |
242 | { | |
243 | arm_stub_none, | |
244 | DEF_STUBS | |
245 | ||
246 | // First reloc stub type. | |
247 | arm_stub_reloc_first = arm_stub_long_branch_any_any, | |
248 | // Last reloc stub type. | |
249 | arm_stub_reloc_last = arm_stub_long_branch_thumb_only_pic, | |
250 | ||
251 | // First Cortex-A8 stub type. | |
252 | arm_stub_cortex_a8_first = arm_stub_a8_veneer_b_cond, | |
253 | // Last Cortex-A8 stub type. | |
254 | arm_stub_cortex_a8_last = arm_stub_a8_veneer_blx, | |
255 | ||
256 | // Last stub type. | |
257 | arm_stub_type_last = arm_stub_a8_veneer_blx | |
258 | } Stub_type; | |
259 | #undef DEF_STUB | |
260 | ||
261 | // Stub template class. Templates are meant to be read-only objects. | |
262 | // A stub template for a stub type contains all read-only attributes | |
263 | // common to all stubs of the same type. | |
264 | ||
265 | class Stub_template | |
266 | { | |
267 | public: | |
268 | Stub_template(Stub_type, const Insn_template*, size_t); | |
269 | ||
270 | ~Stub_template() | |
271 | { } | |
272 | ||
273 | // Return stub type. | |
274 | Stub_type | |
275 | type() const | |
276 | { return this->type_; } | |
277 | ||
278 | // Return an array of instruction templates. | |
279 | const Insn_template* | |
280 | insns() const | |
281 | { return this->insns_; } | |
282 | ||
283 | // Return size of template in number of instructions. | |
284 | size_t | |
285 | insn_count() const | |
286 | { return this->insn_count_; } | |
287 | ||
288 | // Return size of template in bytes. | |
289 | size_t | |
290 | size() const | |
291 | { return this->size_; } | |
292 | ||
293 | // Return alignment of the stub template. | |
294 | unsigned | |
295 | alignment() const | |
296 | { return this->alignment_; } | |
297 | ||
298 | // Return whether entry point is in thumb mode. | |
299 | bool | |
300 | entry_in_thumb_mode() const | |
301 | { return this->entry_in_thumb_mode_; } | |
302 | ||
303 | // Return number of relocations in this template. | |
304 | size_t | |
305 | reloc_count() const | |
306 | { return this->relocs_.size(); } | |
307 | ||
308 | // Return index of the I-th instruction with relocation. | |
309 | size_t | |
310 | reloc_insn_index(size_t i) const | |
311 | { | |
312 | gold_assert(i < this->relocs_.size()); | |
313 | return this->relocs_[i].first; | |
314 | } | |
315 | ||
316 | // Return the offset of the I-th instruction with relocation from the | |
317 | // beginning of the stub. | |
318 | section_size_type | |
319 | reloc_offset(size_t i) const | |
320 | { | |
321 | gold_assert(i < this->relocs_.size()); | |
322 | return this->relocs_[i].second; | |
323 | } | |
324 | ||
325 | private: | |
326 | // This contains information about an instruction template with a relocation | |
327 | // and its offset from start of stub. | |
328 | typedef std::pair<size_t, section_size_type> Reloc; | |
329 | ||
330 | // A Stub_template may not be copied. We want to share templates as much | |
331 | // as possible. | |
332 | Stub_template(const Stub_template&); | |
333 | Stub_template& operator=(const Stub_template&); | |
334 | ||
335 | // Stub type. | |
336 | Stub_type type_; | |
337 | // Points to an array of Insn_templates. | |
338 | const Insn_template* insns_; | |
339 | // Number of Insn_templates in insns_[]. | |
340 | size_t insn_count_; | |
341 | // Size of templated instructions in bytes. | |
342 | size_t size_; | |
343 | // Alignment of templated instructions. | |
344 | unsigned alignment_; | |
345 | // Flag to indicate if entry is in thumb mode. | |
346 | bool entry_in_thumb_mode_; | |
347 | // A table of reloc instruction indices and offsets. We can find these by | |
348 | // looking at the instruction templates but we pre-compute and then stash | |
349 | // them here for speed. | |
350 | std::vector<Reloc> relocs_; | |
351 | }; | |
352 | ||
353 | // | |
354 | // A class for code stubs. This is a base class for different type of | |
355 | // stubs used in the ARM target. | |
356 | // | |
357 | ||
358 | class Stub | |
359 | { | |
360 | private: | |
361 | static const section_offset_type invalid_offset = | |
362 | static_cast<section_offset_type>(-1); | |
363 | ||
364 | public: | |
365 | Stub(const Stub_template* stub_template) | |
366 | : stub_template_(stub_template), offset_(invalid_offset) | |
367 | { } | |
368 | ||
369 | virtual | |
370 | ~Stub() | |
371 | { } | |
372 | ||
373 | // Return the stub template. | |
374 | const Stub_template* | |
375 | stub_template() const | |
376 | { return this->stub_template_; } | |
377 | ||
378 | // Return offset of code stub from beginning of its containing stub table. | |
379 | section_offset_type | |
380 | offset() const | |
381 | { | |
382 | gold_assert(this->offset_ != invalid_offset); | |
383 | return this->offset_; | |
384 | } | |
385 | ||
386 | // Set offset of code stub from beginning of its containing stub table. | |
387 | void | |
388 | set_offset(section_offset_type offset) | |
389 | { this->offset_ = offset; } | |
390 | ||
391 | // Return the relocation target address of the i-th relocation in the | |
392 | // stub. This must be defined in a child class. | |
393 | Arm_address | |
394 | reloc_target(size_t i) | |
395 | { return this->do_reloc_target(i); } | |
396 | ||
397 | // Write a stub at output VIEW. BIG_ENDIAN select how a stub is written. | |
398 | void | |
399 | write(unsigned char* view, section_size_type view_size, bool big_endian) | |
400 | { this->do_write(view, view_size, big_endian); } | |
401 | ||
402 | protected: | |
403 | // This must be defined in the child class. | |
404 | virtual Arm_address | |
405 | do_reloc_target(size_t) = 0; | |
406 | ||
407 | // This must be defined in the child class. | |
408 | virtual void | |
409 | do_write(unsigned char*, section_size_type, bool) = 0; | |
410 | ||
411 | private: | |
412 | // Its template. | |
413 | const Stub_template* stub_template_; | |
414 | // Offset within the section of containing this stub. | |
415 | section_offset_type offset_; | |
416 | }; | |
417 | ||
418 | // Reloc stub class. These are stubs we use to fix up relocation because | |
419 | // of limited branch ranges. | |
420 | ||
421 | class Reloc_stub : public Stub | |
422 | { | |
423 | public: | |
424 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); | |
425 | // We assume we never jump to this address. | |
426 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
427 | ||
428 | // Return destination address. | |
429 | Arm_address | |
430 | destination_address() const | |
431 | { | |
432 | gold_assert(this->destination_address_ != this->invalid_address); | |
433 | return this->destination_address_; | |
434 | } | |
435 | ||
436 | // Set destination address. | |
437 | void | |
438 | set_destination_address(Arm_address address) | |
439 | { | |
440 | gold_assert(address != this->invalid_address); | |
441 | this->destination_address_ = address; | |
442 | } | |
443 | ||
444 | // Reset destination address. | |
445 | void | |
446 | reset_destination_address() | |
447 | { this->destination_address_ = this->invalid_address; } | |
448 | ||
449 | // Determine stub type for a branch of a relocation of R_TYPE going | |
450 | // from BRANCH_ADDRESS to BRANCH_TARGET. If TARGET_IS_THUMB is set, | |
451 | // the branch target is a thumb instruction. TARGET is used for look | |
452 | // up ARM-specific linker settings. | |
453 | static Stub_type | |
454 | stub_type_for_reloc(unsigned int r_type, Arm_address branch_address, | |
455 | Arm_address branch_target, bool target_is_thumb); | |
456 | ||
457 | // Reloc_stub key. A key is logically a triplet of a stub type, a symbol | |
458 | // and an addend. Since we treat global and local symbol differently, we | |
459 | // use a Symbol object for a global symbol and a object-index pair for | |
460 | // a local symbol. | |
461 | class Key | |
462 | { | |
463 | public: | |
464 | // If SYMBOL is not null, this is a global symbol, we ignore RELOBJ and | |
465 | // R_SYM. Otherwise, this is a local symbol and RELOBJ must non-NULL | |
466 | // and R_SYM must not be invalid_index. | |
467 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, | |
468 | unsigned int r_sym, int32_t addend) | |
469 | : stub_type_(stub_type), addend_(addend) | |
470 | { | |
471 | if (symbol != NULL) | |
472 | { | |
473 | this->r_sym_ = Reloc_stub::invalid_index; | |
474 | this->u_.symbol = symbol; | |
475 | } | |
476 | else | |
477 | { | |
478 | gold_assert(relobj != NULL && r_sym != invalid_index); | |
479 | this->r_sym_ = r_sym; | |
480 | this->u_.relobj = relobj; | |
481 | } | |
482 | } | |
483 | ||
484 | ~Key() | |
485 | { } | |
486 | ||
487 | // Accessors: Keys are meant to be read-only object so no modifiers are | |
488 | // provided. | |
489 | ||
490 | // Return stub type. | |
491 | Stub_type | |
492 | stub_type() const | |
493 | { return this->stub_type_; } | |
494 | ||
495 | // Return the local symbol index or invalid_index. | |
496 | unsigned int | |
497 | r_sym() const | |
498 | { return this->r_sym_; } | |
499 | ||
500 | // Return the symbol if there is one. | |
501 | const Symbol* | |
502 | symbol() const | |
503 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
504 | ||
505 | // Return the relobj if there is one. | |
506 | const Relobj* | |
507 | relobj() const | |
508 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
509 | ||
510 | // Whether this equals to another key k. | |
511 | bool | |
512 | eq(const Key& k) const | |
513 | { | |
514 | return ((this->stub_type_ == k.stub_type_) | |
515 | && (this->r_sym_ == k.r_sym_) | |
516 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
517 | ? (this->u_.relobj == k.u_.relobj) | |
518 | : (this->u_.symbol == k.u_.symbol)) | |
519 | && (this->addend_ == k.addend_)); | |
520 | } | |
521 | ||
522 | // Return a hash value. | |
523 | size_t | |
524 | hash_value() const | |
525 | { | |
526 | return (this->stub_type_ | |
527 | ^ this->r_sym_ | |
528 | ^ gold::string_hash<char>( | |
529 | (this->r_sym_ != Reloc_stub::invalid_index) | |
530 | ? this->u_.relobj->name().c_str() | |
531 | : this->u_.symbol->name()) | |
532 | ^ this->addend_); | |
533 | } | |
534 | ||
535 | // Functors for STL associative containers. | |
536 | struct hash | |
537 | { | |
538 | size_t | |
539 | operator()(const Key& k) const | |
540 | { return k.hash_value(); } | |
541 | }; | |
542 | ||
543 | struct equal_to | |
544 | { | |
545 | bool | |
546 | operator()(const Key& k1, const Key& k2) const | |
547 | { return k1.eq(k2); } | |
548 | }; | |
549 | ||
550 | // Name of key. This is mainly for debugging. | |
551 | std::string | |
552 | name() const; | |
553 | ||
554 | private: | |
555 | // Stub type. | |
556 | Stub_type stub_type_; | |
557 | // If this is a local symbol, this is the index in the defining object. | |
558 | // Otherwise, it is invalid_index for a global symbol. | |
559 | unsigned int r_sym_; | |
560 | // If r_sym_ is invalid index. This points to a global symbol. | |
561 | // Otherwise, this points a relobj. We used the unsized and target | |
562 | // independent Symbol and Relobj classes instead of Arm_symbol and | |
563 | // Arm_relobj. This is done to avoid making the stub class a template | |
564 | // as most of the stub machinery is endianity-neutral. However, it | |
565 | // may require a bit of casting done by users of this class. | |
566 | union | |
567 | { | |
568 | const Symbol* symbol; | |
569 | const Relobj* relobj; | |
570 | } u_; | |
571 | // Addend associated with a reloc. | |
572 | int32_t addend_; | |
573 | }; | |
574 | ||
575 | protected: | |
576 | // Reloc_stubs are created via a stub factory. So these are protected. | |
577 | Reloc_stub(const Stub_template* stub_template) | |
578 | : Stub(stub_template), destination_address_(invalid_address) | |
579 | { } | |
580 | ||
581 | ~Reloc_stub() | |
582 | { } | |
583 | ||
584 | friend class Stub_factory; | |
585 | ||
586 | private: | |
587 | // Return the relocation target address of the i-th relocation in the | |
588 | // stub. | |
589 | Arm_address | |
590 | do_reloc_target(size_t i) | |
591 | { | |
592 | // All reloc stub have only one relocation. | |
593 | gold_assert(i == 0); | |
594 | return this->destination_address_; | |
595 | } | |
596 | ||
597 | // A template to implement do_write below. | |
598 | template<bool big_endian> | |
599 | void inline | |
600 | do_fixed_endian_write(unsigned char*, section_size_type); | |
601 | ||
602 | // Write a stub. | |
603 | void | |
604 | do_write(unsigned char* view, section_size_type view_size, bool big_endian); | |
605 | ||
606 | // Address of destination. | |
607 | Arm_address destination_address_; | |
608 | }; | |
609 | ||
610 | // Stub factory class. | |
611 | ||
612 | class Stub_factory | |
613 | { | |
614 | public: | |
615 | // Return the unique instance of this class. | |
616 | static const Stub_factory& | |
617 | get_instance() | |
618 | { | |
619 | static Stub_factory singleton; | |
620 | return singleton; | |
621 | } | |
622 | ||
623 | // Make a relocation stub. | |
624 | Reloc_stub* | |
625 | make_reloc_stub(Stub_type stub_type) const | |
626 | { | |
627 | gold_assert(stub_type >= arm_stub_reloc_first | |
628 | && stub_type <= arm_stub_reloc_last); | |
629 | return new Reloc_stub(this->stub_templates_[stub_type]); | |
630 | } | |
631 | ||
632 | private: | |
633 | // Constructor and destructor are protected since we only return a single | |
634 | // instance created in Stub_factory::get_instance(). | |
635 | ||
636 | Stub_factory(); | |
637 | ||
638 | // A Stub_factory may not be copied since it is a singleton. | |
639 | Stub_factory(const Stub_factory&); | |
640 | Stub_factory& operator=(Stub_factory&); | |
641 | ||
642 | // Stub templates. These are initialized in the constructor. | |
643 | const Stub_template* stub_templates_[arm_stub_type_last+1]; | |
644 | }; | |
645 | ||
c121c671 DK |
646 | // Utilities for manipulating integers of up to 32-bits |
647 | ||
648 | namespace utils | |
649 | { | |
650 | // Sign extend an n-bit unsigned integer stored in an uint32_t into | |
651 | // an int32_t. NO_BITS must be between 1 to 32. | |
652 | template<int no_bits> | |
653 | static inline int32_t | |
654 | sign_extend(uint32_t bits) | |
655 | { | |
96d49306 | 656 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
657 | if (no_bits == 32) |
658 | return static_cast<int32_t>(bits); | |
659 | uint32_t mask = (~((uint32_t) 0)) >> (32 - no_bits); | |
660 | bits &= mask; | |
661 | uint32_t top_bit = 1U << (no_bits - 1); | |
662 | int32_t as_signed = static_cast<int32_t>(bits); | |
663 | return (bits & top_bit) ? as_signed + (-top_bit * 2) : as_signed; | |
664 | } | |
665 | ||
666 | // Detects overflow of an NO_BITS integer stored in a uint32_t. | |
667 | template<int no_bits> | |
668 | static inline bool | |
669 | has_overflow(uint32_t bits) | |
670 | { | |
96d49306 | 671 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
672 | if (no_bits == 32) |
673 | return false; | |
674 | int32_t max = (1 << (no_bits - 1)) - 1; | |
675 | int32_t min = -(1 << (no_bits - 1)); | |
676 | int32_t as_signed = static_cast<int32_t>(bits); | |
677 | return as_signed > max || as_signed < min; | |
678 | } | |
679 | ||
5e445df6 ILT |
680 | // Detects overflow of an NO_BITS integer stored in a uint32_t when it |
681 | // fits in the given number of bits as either a signed or unsigned value. | |
682 | // For example, has_signed_unsigned_overflow<8> would check | |
683 | // -128 <= bits <= 255 | |
684 | template<int no_bits> | |
685 | static inline bool | |
686 | has_signed_unsigned_overflow(uint32_t bits) | |
687 | { | |
688 | gold_assert(no_bits >= 2 && no_bits <= 32); | |
689 | if (no_bits == 32) | |
690 | return false; | |
691 | int32_t max = static_cast<int32_t>((1U << no_bits) - 1); | |
692 | int32_t min = -(1 << (no_bits - 1)); | |
693 | int32_t as_signed = static_cast<int32_t>(bits); | |
694 | return as_signed > max || as_signed < min; | |
695 | } | |
696 | ||
c121c671 DK |
697 | // Select bits from A and B using bits in MASK. For each n in [0..31], |
698 | // the n-th bit in the result is chosen from the n-th bits of A and B. | |
699 | // A zero selects A and a one selects B. | |
700 | static inline uint32_t | |
701 | bit_select(uint32_t a, uint32_t b, uint32_t mask) | |
702 | { return (a & ~mask) | (b & mask); } | |
703 | }; | |
704 | ||
4a657b0d DK |
705 | template<bool big_endian> |
706 | class Target_arm : public Sized_target<32, big_endian> | |
707 | { | |
708 | public: | |
709 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
710 | Reloc_section; | |
711 | ||
712 | Target_arm() | |
94cdfcff DK |
713 | : Sized_target<32, big_endian>(&arm_info), |
714 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), | |
b569affa DK |
715 | copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL), |
716 | may_use_blx_(true), should_force_pic_veneer_(false) | |
4a657b0d DK |
717 | { } |
718 | ||
b569affa DK |
719 | // Whether we can use BLX. |
720 | bool | |
721 | may_use_blx() const | |
722 | { return this->may_use_blx_; } | |
723 | ||
724 | // Set use-BLX flag. | |
725 | void | |
726 | set_may_use_blx(bool value) | |
727 | { this->may_use_blx_ = value; } | |
728 | ||
729 | // Whether we force PCI branch veneers. | |
730 | bool | |
731 | should_force_pic_veneer() const | |
732 | { return this->should_force_pic_veneer_; } | |
733 | ||
734 | // Set PIC veneer flag. | |
735 | void | |
736 | set_should_force_pic_veneer(bool value) | |
737 | { this->should_force_pic_veneer_ = value; } | |
738 | ||
739 | // Whether we use THUMB-2 instructions. | |
740 | bool | |
741 | using_thumb2() const | |
742 | { | |
743 | // FIXME: This should not hard-coded. | |
744 | return false; | |
745 | } | |
746 | ||
747 | // Whether we use THUMB/THUMB-2 instructions only. | |
748 | bool | |
749 | using_thumb_only() const | |
750 | { | |
751 | // FIXME: This should not hard-coded. | |
752 | return false; | |
753 | } | |
754 | ||
4a657b0d DK |
755 | // Process the relocations to determine unreferenced sections for |
756 | // garbage collection. | |
757 | void | |
758 | gc_process_relocs(const General_options& options, | |
759 | Symbol_table* symtab, | |
760 | Layout* layout, | |
761 | Sized_relobj<32, big_endian>* object, | |
762 | unsigned int data_shndx, | |
763 | unsigned int sh_type, | |
764 | const unsigned char* prelocs, | |
765 | size_t reloc_count, | |
766 | Output_section* output_section, | |
767 | bool needs_special_offset_handling, | |
768 | size_t local_symbol_count, | |
769 | const unsigned char* plocal_symbols); | |
770 | ||
771 | // Scan the relocations to look for symbol adjustments. | |
772 | void | |
773 | scan_relocs(const General_options& options, | |
774 | Symbol_table* symtab, | |
775 | Layout* layout, | |
776 | Sized_relobj<32, big_endian>* object, | |
777 | unsigned int data_shndx, | |
778 | unsigned int sh_type, | |
779 | const unsigned char* prelocs, | |
780 | size_t reloc_count, | |
781 | Output_section* output_section, | |
782 | bool needs_special_offset_handling, | |
783 | size_t local_symbol_count, | |
784 | const unsigned char* plocal_symbols); | |
785 | ||
786 | // Finalize the sections. | |
787 | void | |
788 | do_finalize_sections(Layout*); | |
789 | ||
94cdfcff | 790 | // Return the value to use for a dynamic symbol which requires special |
4a657b0d DK |
791 | // treatment. |
792 | uint64_t | |
793 | do_dynsym_value(const Symbol*) const; | |
794 | ||
795 | // Relocate a section. | |
796 | void | |
797 | relocate_section(const Relocate_info<32, big_endian>*, | |
798 | unsigned int sh_type, | |
799 | const unsigned char* prelocs, | |
800 | size_t reloc_count, | |
801 | Output_section* output_section, | |
802 | bool needs_special_offset_handling, | |
803 | unsigned char* view, | |
804 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
805 | section_size_type view_size, |
806 | const Reloc_symbol_changes*); | |
4a657b0d DK |
807 | |
808 | // Scan the relocs during a relocatable link. | |
809 | void | |
810 | scan_relocatable_relocs(const General_options& options, | |
811 | Symbol_table* symtab, | |
812 | Layout* layout, | |
813 | Sized_relobj<32, big_endian>* object, | |
814 | unsigned int data_shndx, | |
815 | unsigned int sh_type, | |
816 | const unsigned char* prelocs, | |
817 | size_t reloc_count, | |
818 | Output_section* output_section, | |
819 | bool needs_special_offset_handling, | |
820 | size_t local_symbol_count, | |
821 | const unsigned char* plocal_symbols, | |
822 | Relocatable_relocs*); | |
823 | ||
824 | // Relocate a section during a relocatable link. | |
825 | void | |
826 | relocate_for_relocatable(const Relocate_info<32, big_endian>*, | |
827 | unsigned int sh_type, | |
828 | const unsigned char* prelocs, | |
829 | size_t reloc_count, | |
830 | Output_section* output_section, | |
831 | off_t offset_in_output_section, | |
832 | const Relocatable_relocs*, | |
833 | unsigned char* view, | |
834 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
835 | section_size_type view_size, | |
836 | unsigned char* reloc_view, | |
837 | section_size_type reloc_view_size); | |
838 | ||
839 | // Return whether SYM is defined by the ABI. | |
840 | bool | |
841 | do_is_defined_by_abi(Symbol* sym) const | |
842 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
843 | ||
94cdfcff DK |
844 | // Return the size of the GOT section. |
845 | section_size_type | |
846 | got_size() | |
847 | { | |
848 | gold_assert(this->got_ != NULL); | |
849 | return this->got_->data_size(); | |
850 | } | |
851 | ||
4a657b0d DK |
852 | // Map platform-specific reloc types |
853 | static unsigned int | |
854 | get_real_reloc_type (unsigned int r_type); | |
855 | ||
b569affa DK |
856 | // Get the default ARM target. |
857 | static const Target_arm<big_endian>& | |
858 | default_target() | |
859 | { | |
860 | gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM | |
861 | && parameters->target().is_big_endian() == big_endian); | |
862 | return static_cast<const Target_arm<big_endian>&>(parameters->target()); | |
863 | } | |
864 | ||
4a657b0d DK |
865 | private: |
866 | // The class which scans relocations. | |
867 | class Scan | |
868 | { | |
869 | public: | |
870 | Scan() | |
bec53400 | 871 | : issued_non_pic_error_(false) |
4a657b0d DK |
872 | { } |
873 | ||
874 | inline void | |
875 | local(const General_options& options, Symbol_table* symtab, | |
876 | Layout* layout, Target_arm* target, | |
877 | Sized_relobj<32, big_endian>* object, | |
878 | unsigned int data_shndx, | |
879 | Output_section* output_section, | |
880 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
881 | const elfcpp::Sym<32, big_endian>& lsym); | |
882 | ||
883 | inline void | |
884 | global(const General_options& options, Symbol_table* symtab, | |
885 | Layout* layout, Target_arm* target, | |
886 | Sized_relobj<32, big_endian>* object, | |
887 | unsigned int data_shndx, | |
888 | Output_section* output_section, | |
889 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
890 | Symbol* gsym); | |
891 | ||
892 | private: | |
893 | static void | |
894 | unsupported_reloc_local(Sized_relobj<32, big_endian>*, | |
895 | unsigned int r_type); | |
896 | ||
897 | static void | |
898 | unsupported_reloc_global(Sized_relobj<32, big_endian>*, | |
899 | unsigned int r_type, Symbol*); | |
bec53400 DK |
900 | |
901 | void | |
902 | check_non_pic(Relobj*, unsigned int r_type); | |
903 | ||
904 | // Almost identical to Symbol::needs_plt_entry except that it also | |
905 | // handles STT_ARM_TFUNC. | |
906 | static bool | |
907 | symbol_needs_plt_entry(const Symbol* sym) | |
908 | { | |
909 | // An undefined symbol from an executable does not need a PLT entry. | |
910 | if (sym->is_undefined() && !parameters->options().shared()) | |
911 | return false; | |
912 | ||
913 | return (!parameters->doing_static_link() | |
914 | && (sym->type() == elfcpp::STT_FUNC | |
915 | || sym->type() == elfcpp::STT_ARM_TFUNC) | |
916 | && (sym->is_from_dynobj() | |
917 | || sym->is_undefined() | |
918 | || sym->is_preemptible())); | |
919 | } | |
920 | ||
921 | // Whether we have issued an error about a non-PIC compilation. | |
922 | bool issued_non_pic_error_; | |
4a657b0d DK |
923 | }; |
924 | ||
925 | // The class which implements relocation. | |
926 | class Relocate | |
927 | { | |
928 | public: | |
929 | Relocate() | |
930 | { } | |
931 | ||
932 | ~Relocate() | |
933 | { } | |
934 | ||
bec53400 DK |
935 | // Return whether the static relocation needs to be applied. |
936 | inline bool | |
937 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
938 | int ref_flags, | |
939 | bool is_32bit, | |
940 | Output_section* output_section); | |
941 | ||
4a657b0d DK |
942 | // Do a relocation. Return false if the caller should not issue |
943 | // any warnings about this relocation. | |
944 | inline bool | |
945 | relocate(const Relocate_info<32, big_endian>*, Target_arm*, | |
946 | Output_section*, size_t relnum, | |
947 | const elfcpp::Rel<32, big_endian>&, | |
948 | unsigned int r_type, const Sized_symbol<32>*, | |
949 | const Symbol_value<32>*, | |
950 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, | |
951 | section_size_type); | |
c121c671 DK |
952 | |
953 | // Return whether we want to pass flag NON_PIC_REF for this | |
954 | // reloc. | |
955 | static inline bool | |
956 | reloc_is_non_pic (unsigned int r_type) | |
957 | { | |
958 | switch (r_type) | |
959 | { | |
960 | case elfcpp::R_ARM_REL32: | |
961 | case elfcpp::R_ARM_THM_CALL: | |
962 | case elfcpp::R_ARM_CALL: | |
963 | case elfcpp::R_ARM_JUMP24: | |
964 | case elfcpp::R_ARM_PREL31: | |
be8fcb75 ILT |
965 | case elfcpp::R_ARM_THM_ABS5: |
966 | case elfcpp::R_ARM_ABS8: | |
967 | case elfcpp::R_ARM_ABS12: | |
968 | case elfcpp::R_ARM_ABS16: | |
969 | case elfcpp::R_ARM_BASE_ABS: | |
c121c671 DK |
970 | return true; |
971 | default: | |
972 | return false; | |
973 | } | |
974 | } | |
4a657b0d DK |
975 | }; |
976 | ||
977 | // A class which returns the size required for a relocation type, | |
978 | // used while scanning relocs during a relocatable link. | |
979 | class Relocatable_size_for_reloc | |
980 | { | |
981 | public: | |
982 | unsigned int | |
983 | get_size_for_reloc(unsigned int, Relobj*); | |
984 | }; | |
985 | ||
94cdfcff DK |
986 | // Get the GOT section, creating it if necessary. |
987 | Output_data_got<32, big_endian>* | |
988 | got_section(Symbol_table*, Layout*); | |
989 | ||
990 | // Get the GOT PLT section. | |
991 | Output_data_space* | |
992 | got_plt_section() const | |
993 | { | |
994 | gold_assert(this->got_plt_ != NULL); | |
995 | return this->got_plt_; | |
996 | } | |
997 | ||
998 | // Create a PLT entry for a global symbol. | |
999 | void | |
1000 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1001 | ||
1002 | // Get the PLT section. | |
1003 | const Output_data_plt_arm<big_endian>* | |
1004 | plt_section() const | |
1005 | { | |
1006 | gold_assert(this->plt_ != NULL); | |
1007 | return this->plt_; | |
1008 | } | |
1009 | ||
1010 | // Get the dynamic reloc section, creating it if necessary. | |
1011 | Reloc_section* | |
1012 | rel_dyn_section(Layout*); | |
1013 | ||
1014 | // Return true if the symbol may need a COPY relocation. | |
1015 | // References from an executable object to non-function symbols | |
1016 | // defined in a dynamic object may need a COPY relocation. | |
1017 | bool | |
1018 | may_need_copy_reloc(Symbol* gsym) | |
1019 | { | |
966d4097 DK |
1020 | return (gsym->type() != elfcpp::STT_ARM_TFUNC |
1021 | && gsym->may_need_copy_reloc()); | |
94cdfcff DK |
1022 | } |
1023 | ||
1024 | // Add a potential copy relocation. | |
1025 | void | |
1026 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
1027 | Sized_relobj<32, big_endian>* object, | |
1028 | unsigned int shndx, Output_section* output_section, | |
1029 | Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc) | |
1030 | { | |
1031 | this->copy_relocs_.copy_reloc(symtab, layout, | |
1032 | symtab->get_sized_symbol<32>(sym), | |
1033 | object, shndx, output_section, reloc, | |
1034 | this->rel_dyn_section(layout)); | |
1035 | } | |
1036 | ||
4a657b0d DK |
1037 | // Information about this specific target which we pass to the |
1038 | // general Target structure. | |
1039 | static const Target::Target_info arm_info; | |
94cdfcff DK |
1040 | |
1041 | // The types of GOT entries needed for this platform. | |
1042 | enum Got_type | |
1043 | { | |
1044 | GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol | |
1045 | }; | |
1046 | ||
1047 | // The GOT section. | |
1048 | Output_data_got<32, big_endian>* got_; | |
1049 | // The PLT section. | |
1050 | Output_data_plt_arm<big_endian>* plt_; | |
1051 | // The GOT PLT section. | |
1052 | Output_data_space* got_plt_; | |
1053 | // The dynamic reloc section. | |
1054 | Reloc_section* rel_dyn_; | |
1055 | // Relocs saved to avoid a COPY reloc. | |
1056 | Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_; | |
1057 | // Space for variables copied with a COPY reloc. | |
1058 | Output_data_space* dynbss_; | |
b569affa DK |
1059 | // Whether we can use BLX. |
1060 | bool may_use_blx_; | |
1061 | // Whether we force PIC branch veneers. | |
1062 | bool should_force_pic_veneer_; | |
4a657b0d DK |
1063 | }; |
1064 | ||
1065 | template<bool big_endian> | |
1066 | const Target::Target_info Target_arm<big_endian>::arm_info = | |
1067 | { | |
1068 | 32, // size | |
1069 | big_endian, // is_big_endian | |
1070 | elfcpp::EM_ARM, // machine_code | |
1071 | false, // has_make_symbol | |
1072 | false, // has_resolve | |
1073 | false, // has_code_fill | |
1074 | true, // is_default_stack_executable | |
1075 | '\0', // wrap_char | |
1076 | "/usr/lib/libc.so.1", // dynamic_linker | |
1077 | 0x8000, // default_text_segment_address | |
1078 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
1079 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
1080 | elfcpp::SHN_UNDEF, // small_common_shndx | |
1081 | elfcpp::SHN_UNDEF, // large_common_shndx | |
1082 | 0, // small_common_section_flags | |
1083 | 0 // large_common_section_flags | |
4a657b0d DK |
1084 | }; |
1085 | ||
c121c671 DK |
1086 | // Arm relocate functions class |
1087 | // | |
1088 | ||
1089 | template<bool big_endian> | |
1090 | class Arm_relocate_functions : public Relocate_functions<32, big_endian> | |
1091 | { | |
1092 | public: | |
1093 | typedef enum | |
1094 | { | |
1095 | STATUS_OKAY, // No error during relocation. | |
1096 | STATUS_OVERFLOW, // Relocation oveflow. | |
1097 | STATUS_BAD_RELOC // Relocation cannot be applied. | |
1098 | } Status; | |
1099 | ||
1100 | private: | |
1101 | typedef Relocate_functions<32, big_endian> Base; | |
1102 | typedef Arm_relocate_functions<big_endian> This; | |
1103 | ||
1104 | // Get an symbol value of *PSYMVAL with an ADDEND. This is a wrapper | |
1105 | // to Symbol_value::value(). If HAS_THUMB_BIT is true, that LSB is used | |
1106 | // to distinguish ARM and THUMB functions and it is treated specially. | |
1107 | static inline Symbol_value<32>::Value | |
1108 | arm_symbol_value (const Sized_relobj<32, big_endian> *object, | |
1109 | const Symbol_value<32>* psymval, | |
1110 | Symbol_value<32>::Value addend, | |
1111 | bool has_thumb_bit) | |
1112 | { | |
1113 | typedef Symbol_value<32>::Value Valtype; | |
1114 | ||
1115 | if (has_thumb_bit) | |
1116 | { | |
1117 | Valtype raw = psymval->value(object, 0); | |
1118 | Valtype thumb_bit = raw & 1; | |
1119 | return ((raw & ~((Valtype) 1)) + addend) | thumb_bit; | |
1120 | } | |
1121 | else | |
1122 | return psymval->value(object, addend); | |
1123 | } | |
1124 | ||
fd3c5f0b ILT |
1125 | // Encoding of imm16 argument for movt and movw ARM instructions |
1126 | // from ARM ARM: | |
1127 | // | |
1128 | // imm16 := imm4 | imm12 | |
1129 | // | |
1130 | // f e d c b a 9 8 7 6 5 4 3 2 1 0 f e d c b a 9 8 7 6 5 4 3 2 1 0 | |
1131 | // +-------+---------------+-------+-------+-----------------------+ | |
1132 | // | | |imm4 | |imm12 | | |
1133 | // +-------+---------------+-------+-------+-----------------------+ | |
1134 | ||
1135 | // Extract the relocation addend from VAL based on the ARM | |
1136 | // instruction encoding described above. | |
1137 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1138 | extract_arm_movw_movt_addend( | |
1139 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1140 | { | |
1141 | // According to the Elf ABI for ARM Architecture the immediate | |
1142 | // field is sign-extended to form the addend. | |
1143 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | (val & 0xfff)); | |
1144 | } | |
1145 | ||
1146 | // Insert X into VAL based on the ARM instruction encoding described | |
1147 | // above. | |
1148 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1149 | insert_val_arm_movw_movt( | |
1150 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1151 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1152 | { | |
1153 | val &= 0xfff0f000; | |
1154 | val |= x & 0x0fff; | |
1155 | val |= (x & 0xf000) << 4; | |
1156 | return val; | |
1157 | } | |
1158 | ||
1159 | // Encoding of imm16 argument for movt and movw Thumb2 instructions | |
1160 | // from ARM ARM: | |
1161 | // | |
1162 | // imm16 := imm4 | i | imm3 | imm8 | |
1163 | // | |
1164 | // f e d c b a 9 8 7 6 5 4 3 2 1 0 f e d c b a 9 8 7 6 5 4 3 2 1 0 | |
1165 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
1166 | // | |i| |imm4 || |imm3 | |imm8 | | |
1167 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
1168 | ||
1169 | // Extract the relocation addend from VAL based on the Thumb2 | |
1170 | // instruction encoding described above. | |
1171 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1172 | extract_thumb_movw_movt_addend( | |
1173 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1174 | { | |
1175 | // According to the Elf ABI for ARM Architecture the immediate | |
1176 | // field is sign-extended to form the addend. | |
1177 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | |
1178 | | ((val >> 15) & 0x0800) | |
1179 | | ((val >> 4) & 0x0700) | |
1180 | | (val & 0x00ff)); | |
1181 | } | |
1182 | ||
1183 | // Insert X into VAL based on the Thumb2 instruction encoding | |
1184 | // described above. | |
1185 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1186 | insert_val_thumb_movw_movt( | |
1187 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1188 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1189 | { | |
1190 | val &= 0xfbf08f00; | |
1191 | val |= (x & 0xf000) << 4; | |
1192 | val |= (x & 0x0800) << 15; | |
1193 | val |= (x & 0x0700) << 4; | |
1194 | val |= (x & 0x00ff); | |
1195 | return val; | |
1196 | } | |
1197 | ||
c121c671 DK |
1198 | // FIXME: This probably only works for Android on ARM v5te. We should |
1199 | // following GNU ld for the general case. | |
1200 | template<unsigned r_type> | |
1201 | static inline typename This::Status | |
1202 | arm_branch_common(unsigned char *view, | |
1203 | const Sized_relobj<32, big_endian>* object, | |
1204 | const Symbol_value<32>* psymval, | |
1205 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1206 | bool has_thumb_bit) | |
1207 | { | |
1208 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1209 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1210 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1211 | ||
1212 | bool insn_is_b = (((val >> 28) & 0xf) <= 0xe) | |
1213 | && ((val & 0x0f000000UL) == 0x0a000000UL); | |
1214 | bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL; | |
1215 | bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe) | |
1216 | && ((val & 0x0f000000UL) == 0x0b000000UL); | |
1217 | bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL; | |
1218 | bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL; | |
1219 | ||
1220 | if (r_type == elfcpp::R_ARM_CALL) | |
1221 | { | |
1222 | if (!insn_is_uncond_bl && !insn_is_blx) | |
1223 | return This::STATUS_BAD_RELOC; | |
1224 | } | |
1225 | else if (r_type == elfcpp::R_ARM_JUMP24) | |
1226 | { | |
1227 | if (!insn_is_b && !insn_is_cond_bl) | |
1228 | return This::STATUS_BAD_RELOC; | |
1229 | } | |
1230 | else if (r_type == elfcpp::R_ARM_PLT32) | |
1231 | { | |
1232 | if (!insn_is_any_branch) | |
1233 | return This::STATUS_BAD_RELOC; | |
1234 | } | |
1235 | else | |
1236 | gold_unreachable(); | |
1237 | ||
1238 | Valtype addend = utils::sign_extend<26>(val << 2); | |
1239 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1240 | - address); | |
1241 | ||
1242 | // If target has thumb bit set, we need to either turn the BL | |
1243 | // into a BLX (for ARMv5 or above) or generate a stub. | |
1244 | if (x & 1) | |
1245 | { | |
1246 | // Turn BL to BLX. | |
1247 | if (insn_is_uncond_bl) | |
1248 | val = (val & 0xffffff) | 0xfa000000 | ((x & 2) << 23); | |
1249 | else | |
1250 | return This::STATUS_BAD_RELOC; | |
1251 | } | |
1252 | else | |
1253 | gold_assert(!insn_is_blx); | |
1254 | ||
1255 | val = utils::bit_select(val, (x >> 2), 0xffffffUL); | |
1256 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1257 | return (utils::has_overflow<26>(x) | |
1258 | ? This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
1259 | } | |
1260 | ||
1261 | public: | |
5e445df6 ILT |
1262 | |
1263 | // R_ARM_ABS8: S + A | |
1264 | static inline typename This::Status | |
1265 | abs8(unsigned char *view, | |
1266 | const Sized_relobj<32, big_endian>* object, | |
be8fcb75 | 1267 | const Symbol_value<32>* psymval) |
5e445df6 ILT |
1268 | { |
1269 | typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype; | |
1270 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1271 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1272 | Valtype val = elfcpp::Swap<8, big_endian>::readval(wv); | |
1273 | Reltype addend = utils::sign_extend<8>(val); | |
be8fcb75 | 1274 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); |
5e445df6 ILT |
1275 | val = utils::bit_select(val, x, 0xffU); |
1276 | elfcpp::Swap<8, big_endian>::writeval(wv, val); | |
1277 | return (utils::has_signed_unsigned_overflow<8>(x) | |
1278 | ? This::STATUS_OVERFLOW | |
1279 | : This::STATUS_OKAY); | |
1280 | } | |
1281 | ||
be8fcb75 ILT |
1282 | // R_ARM_THM_ABS5: S + A |
1283 | static inline typename This::Status | |
1284 | thm_abs5(unsigned char *view, | |
1285 | const Sized_relobj<32, big_endian>* object, | |
1286 | const Symbol_value<32>* psymval) | |
1287 | { | |
1288 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1289 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1290 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1291 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
1292 | Reltype addend = (val & 0x7e0U) >> 6; | |
1293 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); | |
1294 | val = utils::bit_select(val, x << 6, 0x7e0U); | |
1295 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
1296 | return (utils::has_overflow<5>(x) | |
1297 | ? This::STATUS_OVERFLOW | |
1298 | : This::STATUS_OKAY); | |
1299 | } | |
1300 | ||
1301 | // R_ARM_ABS12: S + A | |
1302 | static inline typename This::Status | |
1303 | abs12(unsigned char *view, | |
1304 | const Sized_relobj<32, big_endian>* object, | |
1305 | const Symbol_value<32>* psymval) | |
1306 | { | |
1307 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1308 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1309 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1310 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1311 | Reltype addend = val & 0x0fffU; | |
1312 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); | |
1313 | val = utils::bit_select(val, x, 0x0fffU); | |
1314 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1315 | return (utils::has_overflow<12>(x) | |
1316 | ? This::STATUS_OVERFLOW | |
1317 | : This::STATUS_OKAY); | |
1318 | } | |
1319 | ||
1320 | // R_ARM_ABS16: S + A | |
1321 | static inline typename This::Status | |
1322 | abs16(unsigned char *view, | |
1323 | const Sized_relobj<32, big_endian>* object, | |
1324 | const Symbol_value<32>* psymval) | |
1325 | { | |
1326 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1327 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1328 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1329 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
1330 | Reltype addend = utils::sign_extend<16>(val); | |
1331 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); | |
1332 | val = utils::bit_select(val, x, 0xffffU); | |
1333 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
1334 | return (utils::has_signed_unsigned_overflow<16>(x) | |
1335 | ? This::STATUS_OVERFLOW | |
1336 | : This::STATUS_OKAY); | |
1337 | } | |
1338 | ||
c121c671 DK |
1339 | // R_ARM_ABS32: (S + A) | T |
1340 | static inline typename This::Status | |
1341 | abs32(unsigned char *view, | |
1342 | const Sized_relobj<32, big_endian>* object, | |
1343 | const Symbol_value<32>* psymval, | |
1344 | bool has_thumb_bit) | |
1345 | { | |
1346 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1347 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1348 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
1349 | Valtype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit); | |
1350 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
1351 | return This::STATUS_OKAY; | |
1352 | } | |
1353 | ||
1354 | // R_ARM_REL32: (S + A) | T - P | |
1355 | static inline typename This::Status | |
1356 | rel32(unsigned char *view, | |
1357 | const Sized_relobj<32, big_endian>* object, | |
1358 | const Symbol_value<32>* psymval, | |
1359 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1360 | bool has_thumb_bit) | |
1361 | { | |
1362 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1363 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1364 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
1365 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1366 | - address); | |
1367 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
1368 | return This::STATUS_OKAY; | |
1369 | } | |
1370 | ||
1371 | // R_ARM_THM_CALL: (S + A) | T - P | |
1372 | static inline typename This::Status | |
1373 | thm_call(unsigned char *view, | |
1374 | const Sized_relobj<32, big_endian>* object, | |
1375 | const Symbol_value<32>* psymval, | |
1376 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1377 | bool has_thumb_bit) | |
1378 | { | |
1379 | // A thumb call consists of two instructions. | |
1380 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1381 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1382 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1383 | Valtype hi = elfcpp::Swap<16, big_endian>::readval(wv); | |
1384 | Valtype lo = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
1385 | // Must be a BL instruction. lo == 11111xxxxxxxxxxx. | |
1386 | gold_assert((lo & 0xf800) == 0xf800); | |
1387 | Reltype addend = utils::sign_extend<23>(((hi & 0x7ff) << 12) | |
1388 | | ((lo & 0x7ff) << 1)); | |
1389 | Reltype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1390 | - address); | |
1391 | ||
1392 | // If target has no thumb bit set, we need to either turn the BL | |
1393 | // into a BLX (for ARMv5 or above) or generate a stub. | |
1394 | if ((x & 1) == 0) | |
1395 | { | |
1396 | // This only works for ARMv5 and above with interworking enabled. | |
1397 | lo &= 0xefff; | |
1398 | } | |
1399 | hi = utils::bit_select(hi, (x >> 12), 0x7ffU); | |
1400 | lo = utils::bit_select(lo, (x >> 1), 0x7ffU); | |
1401 | elfcpp::Swap<16, big_endian>::writeval(wv, hi); | |
1402 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lo); | |
1403 | return (utils::has_overflow<23>(x) | |
1404 | ? This::STATUS_OVERFLOW | |
1405 | : This::STATUS_OKAY); | |
1406 | } | |
1407 | ||
1408 | // R_ARM_BASE_PREL: B(S) + A - P | |
1409 | static inline typename This::Status | |
1410 | base_prel(unsigned char* view, | |
1411 | elfcpp::Elf_types<32>::Elf_Addr origin, | |
1412 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1413 | { | |
1414 | Base::rel32(view, origin - address); | |
1415 | return STATUS_OKAY; | |
1416 | } | |
1417 | ||
be8fcb75 ILT |
1418 | // R_ARM_BASE_ABS: B(S) + A |
1419 | static inline typename This::Status | |
1420 | base_abs(unsigned char* view, | |
1421 | elfcpp::Elf_types<32>::Elf_Addr origin) | |
1422 | { | |
1423 | Base::rel32(view, origin); | |
1424 | return STATUS_OKAY; | |
1425 | } | |
1426 | ||
c121c671 DK |
1427 | // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG |
1428 | static inline typename This::Status | |
1429 | got_brel(unsigned char* view, | |
1430 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset) | |
1431 | { | |
1432 | Base::rel32(view, got_offset); | |
1433 | return This::STATUS_OKAY; | |
1434 | } | |
1435 | ||
7f5309a5 ILT |
1436 | // R_ARM_GOT_PREL: GOT(S) + A – P |
1437 | static inline typename This::Status | |
1438 | got_prel(unsigned char* view, | |
1439 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset, | |
1440 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1441 | { | |
1442 | Base::rel32(view, got_offset - address); | |
1443 | return This::STATUS_OKAY; | |
1444 | } | |
1445 | ||
c121c671 DK |
1446 | // R_ARM_PLT32: (S + A) | T - P |
1447 | static inline typename This::Status | |
1448 | plt32(unsigned char *view, | |
1449 | const Sized_relobj<32, big_endian>* object, | |
1450 | const Symbol_value<32>* psymval, | |
1451 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1452 | bool has_thumb_bit) | |
1453 | { | |
1454 | return arm_branch_common<elfcpp::R_ARM_PLT32>(view, object, psymval, | |
1455 | address, has_thumb_bit); | |
1456 | } | |
1457 | ||
1458 | // R_ARM_CALL: (S + A) | T - P | |
1459 | static inline typename This::Status | |
1460 | call(unsigned char *view, | |
1461 | const Sized_relobj<32, big_endian>* object, | |
1462 | const Symbol_value<32>* psymval, | |
1463 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1464 | bool has_thumb_bit) | |
1465 | { | |
1466 | return arm_branch_common<elfcpp::R_ARM_CALL>(view, object, psymval, | |
1467 | address, has_thumb_bit); | |
1468 | } | |
1469 | ||
1470 | // R_ARM_JUMP24: (S + A) | T - P | |
1471 | static inline typename This::Status | |
1472 | jump24(unsigned char *view, | |
1473 | const Sized_relobj<32, big_endian>* object, | |
1474 | const Symbol_value<32>* psymval, | |
1475 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1476 | bool has_thumb_bit) | |
1477 | { | |
1478 | return arm_branch_common<elfcpp::R_ARM_JUMP24>(view, object, psymval, | |
1479 | address, has_thumb_bit); | |
1480 | } | |
1481 | ||
1482 | // R_ARM_PREL: (S + A) | T - P | |
1483 | static inline typename This::Status | |
1484 | prel31(unsigned char *view, | |
1485 | const Sized_relobj<32, big_endian>* object, | |
1486 | const Symbol_value<32>* psymval, | |
1487 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1488 | bool has_thumb_bit) | |
1489 | { | |
1490 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1491 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1492 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1493 | Valtype addend = utils::sign_extend<31>(val); | |
1494 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1495 | - address); | |
1496 | val = utils::bit_select(val, x, 0x7fffffffU); | |
1497 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1498 | return (utils::has_overflow<31>(x) ? | |
1499 | This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
1500 | } | |
fd3c5f0b ILT |
1501 | |
1502 | // R_ARM_MOVW_ABS_NC: (S + A) | T | |
1503 | static inline typename This::Status | |
1504 | movw_abs_nc(unsigned char *view, | |
1505 | const Sized_relobj<32, big_endian>* object, | |
1506 | const Symbol_value<32>* psymval, | |
1507 | bool has_thumb_bit) | |
1508 | { | |
1509 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1510 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1511 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1512 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1513 | Valtype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit); | |
1514 | val = This::insert_val_arm_movw_movt(val, x); | |
1515 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1516 | return This::STATUS_OKAY; | |
1517 | } | |
1518 | ||
1519 | // R_ARM_MOVT_ABS: S + A | |
1520 | static inline typename This::Status | |
1521 | movt_abs(unsigned char *view, | |
1522 | const Sized_relobj<32, big_endian>* object, | |
1523 | const Symbol_value<32>* psymval) | |
1524 | { | |
1525 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1526 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1527 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1528 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1529 | Valtype x = This::arm_symbol_value(object, psymval, addend, 0) >> 16; | |
1530 | val = This::insert_val_arm_movw_movt(val, x); | |
1531 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1532 | return This::STATUS_OKAY; | |
1533 | } | |
1534 | ||
1535 | // R_ARM_THM_MOVW_ABS_NC: S + A | T | |
1536 | static inline typename This::Status | |
1537 | thm_movw_abs_nc(unsigned char *view, | |
1538 | const Sized_relobj<32, big_endian>* object, | |
1539 | const Symbol_value<32>* psymval, | |
1540 | bool has_thumb_bit) | |
1541 | { | |
1542 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1543 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1544 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1545 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1546 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
1547 | Reltype addend = extract_thumb_movw_movt_addend(val); | |
1548 | Reltype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit); | |
1549 | val = This::insert_val_thumb_movw_movt(val, x); | |
1550 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1551 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1552 | return This::STATUS_OKAY; | |
1553 | } | |
1554 | ||
1555 | // R_ARM_THM_MOVT_ABS: S + A | |
1556 | static inline typename This::Status | |
1557 | thm_movt_abs(unsigned char *view, | |
1558 | const Sized_relobj<32, big_endian>* object, | |
1559 | const Symbol_value<32>* psymval) | |
1560 | { | |
1561 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1562 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1563 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1564 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1565 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
1566 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
1567 | Reltype x = This::arm_symbol_value(object, psymval, addend, 0) >> 16; | |
1568 | val = This::insert_val_thumb_movw_movt(val, x); | |
1569 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1570 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1571 | return This::STATUS_OKAY; | |
1572 | } | |
1573 | ||
c2a122b6 ILT |
1574 | // R_ARM_MOVW_PREL_NC: (S + A) | T - P |
1575 | static inline typename This::Status | |
1576 | movw_prel_nc(unsigned char *view, | |
1577 | const Sized_relobj<32, big_endian>* object, | |
1578 | const Symbol_value<32>* psymval, | |
1579 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1580 | bool has_thumb_bit) | |
1581 | { | |
1582 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1583 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1584 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1585 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1586 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1587 | - address); | |
1588 | val = This::insert_val_arm_movw_movt(val, x); | |
1589 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1590 | return This::STATUS_OKAY; | |
1591 | } | |
1592 | ||
1593 | // R_ARM_MOVT_PREL: S + A - P | |
1594 | static inline typename This::Status | |
1595 | movt_prel(unsigned char *view, | |
1596 | const Sized_relobj<32, big_endian>* object, | |
1597 | const Symbol_value<32>* psymval, | |
1598 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1599 | { | |
1600 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1601 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1602 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1603 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1604 | Valtype x = (This::arm_symbol_value(object, psymval, addend, 0) | |
1605 | - address) >> 16; | |
1606 | val = This::insert_val_arm_movw_movt(val, x); | |
1607 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1608 | return This::STATUS_OKAY; | |
1609 | } | |
1610 | ||
1611 | // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P | |
1612 | static inline typename This::Status | |
1613 | thm_movw_prel_nc(unsigned char *view, | |
1614 | const Sized_relobj<32, big_endian>* object, | |
1615 | const Symbol_value<32>* psymval, | |
1616 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1617 | bool has_thumb_bit) | |
1618 | { | |
1619 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1620 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1621 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1622 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1623 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
1624 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
1625 | Reltype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1626 | - address); | |
1627 | val = This::insert_val_thumb_movw_movt(val, x); | |
1628 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1629 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1630 | return This::STATUS_OKAY; | |
1631 | } | |
1632 | ||
1633 | // R_ARM_THM_MOVT_PREL: S + A - P | |
1634 | static inline typename This::Status | |
1635 | thm_movt_prel(unsigned char *view, | |
1636 | const Sized_relobj<32, big_endian>* object, | |
1637 | const Symbol_value<32>* psymval, | |
1638 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1639 | { | |
1640 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1641 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1642 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1643 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1644 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
1645 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
1646 | Reltype x = (This::arm_symbol_value(object, psymval, addend, 0) | |
1647 | - address) >> 16; | |
1648 | val = This::insert_val_thumb_movw_movt(val, x); | |
1649 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1650 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1651 | return This::STATUS_OKAY; | |
1652 | } | |
c121c671 DK |
1653 | }; |
1654 | ||
94cdfcff DK |
1655 | // Get the GOT section, creating it if necessary. |
1656 | ||
1657 | template<bool big_endian> | |
1658 | Output_data_got<32, big_endian>* | |
1659 | Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout) | |
1660 | { | |
1661 | if (this->got_ == NULL) | |
1662 | { | |
1663 | gold_assert(symtab != NULL && layout != NULL); | |
1664 | ||
1665 | this->got_ = new Output_data_got<32, big_endian>(); | |
1666 | ||
1667 | Output_section* os; | |
1668 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1669 | (elfcpp::SHF_ALLOC | |
1670 | | elfcpp::SHF_WRITE), | |
1671 | this->got_); | |
1672 | os->set_is_relro(); | |
1673 | ||
1674 | // The old GNU linker creates a .got.plt section. We just | |
1675 | // create another set of data in the .got section. Note that we | |
1676 | // always create a PLT if we create a GOT, although the PLT | |
1677 | // might be empty. | |
1678 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); | |
1679 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1680 | (elfcpp::SHF_ALLOC | |
1681 | | elfcpp::SHF_WRITE), | |
1682 | this->got_plt_); | |
1683 | os->set_is_relro(); | |
1684 | ||
1685 | // The first three entries are reserved. | |
1686 | this->got_plt_->set_current_data_size(3 * 4); | |
1687 | ||
1688 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1689 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1690 | this->got_plt_, | |
1691 | 0, 0, elfcpp::STT_OBJECT, | |
1692 | elfcpp::STB_LOCAL, | |
1693 | elfcpp::STV_HIDDEN, 0, | |
1694 | false, false); | |
1695 | } | |
1696 | return this->got_; | |
1697 | } | |
1698 | ||
1699 | // Get the dynamic reloc section, creating it if necessary. | |
1700 | ||
1701 | template<bool big_endian> | |
1702 | typename Target_arm<big_endian>::Reloc_section* | |
1703 | Target_arm<big_endian>::rel_dyn_section(Layout* layout) | |
1704 | { | |
1705 | if (this->rel_dyn_ == NULL) | |
1706 | { | |
1707 | gold_assert(layout != NULL); | |
1708 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
1709 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1710 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
1711 | } | |
1712 | return this->rel_dyn_; | |
1713 | } | |
1714 | ||
b569affa DK |
1715 | // Insn_template methods. |
1716 | ||
1717 | // Return byte size of an instruction template. | |
1718 | ||
1719 | size_t | |
1720 | Insn_template::size() const | |
1721 | { | |
1722 | switch (this->type()) | |
1723 | { | |
1724 | case THUMB16_TYPE: | |
1725 | return 2; | |
1726 | case ARM_TYPE: | |
1727 | case THUMB32_TYPE: | |
1728 | case DATA_TYPE: | |
1729 | return 4; | |
1730 | default: | |
1731 | gold_unreachable(); | |
1732 | } | |
1733 | } | |
1734 | ||
1735 | // Return alignment of an instruction template. | |
1736 | ||
1737 | unsigned | |
1738 | Insn_template::alignment() const | |
1739 | { | |
1740 | switch (this->type()) | |
1741 | { | |
1742 | case THUMB16_TYPE: | |
1743 | case THUMB32_TYPE: | |
1744 | return 2; | |
1745 | case ARM_TYPE: | |
1746 | case DATA_TYPE: | |
1747 | return 4; | |
1748 | default: | |
1749 | gold_unreachable(); | |
1750 | } | |
1751 | } | |
1752 | ||
1753 | // Stub_template methods. | |
1754 | ||
1755 | Stub_template::Stub_template( | |
1756 | Stub_type type, const Insn_template* insns, | |
1757 | size_t insn_count) | |
1758 | : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1), | |
1759 | entry_in_thumb_mode_(false), relocs_() | |
1760 | { | |
1761 | off_t offset = 0; | |
1762 | ||
1763 | // Compute byte size and alignment of stub template. | |
1764 | for (size_t i = 0; i < insn_count; i++) | |
1765 | { | |
1766 | unsigned insn_alignment = insns[i].alignment(); | |
1767 | size_t insn_size = insns[i].size(); | |
1768 | gold_assert((offset & (insn_alignment - 1)) == 0); | |
1769 | this->alignment_ = std::max(this->alignment_, insn_alignment); | |
1770 | switch (insns[i].type()) | |
1771 | { | |
1772 | case Insn_template::THUMB16_TYPE: | |
1773 | if (i == 0) | |
1774 | this->entry_in_thumb_mode_ = true; | |
1775 | break; | |
1776 | ||
1777 | case Insn_template::THUMB32_TYPE: | |
1778 | if (insns[i].r_type() != elfcpp::R_ARM_NONE) | |
1779 | this->relocs_.push_back(Reloc(i, offset)); | |
1780 | if (i == 0) | |
1781 | this->entry_in_thumb_mode_ = true; | |
1782 | break; | |
1783 | ||
1784 | case Insn_template::ARM_TYPE: | |
1785 | // Handle cases where the target is encoded within the | |
1786 | // instruction. | |
1787 | if (insns[i].r_type() == elfcpp::R_ARM_JUMP24) | |
1788 | this->relocs_.push_back(Reloc(i, offset)); | |
1789 | break; | |
1790 | ||
1791 | case Insn_template::DATA_TYPE: | |
1792 | // Entry point cannot be data. | |
1793 | gold_assert(i != 0); | |
1794 | this->relocs_.push_back(Reloc(i, offset)); | |
1795 | break; | |
1796 | ||
1797 | default: | |
1798 | gold_unreachable(); | |
1799 | } | |
1800 | offset += insn_size; | |
1801 | } | |
1802 | this->size_ = offset; | |
1803 | } | |
1804 | ||
1805 | // Reloc_stub::Key methods. | |
1806 | ||
1807 | // Dump a Key as a string for debugging. | |
1808 | ||
1809 | std::string | |
1810 | Reloc_stub::Key::name() const | |
1811 | { | |
1812 | if (this->r_sym_ == invalid_index) | |
1813 | { | |
1814 | // Global symbol key name | |
1815 | // <stub-type>:<symbol name>:<addend>. | |
1816 | const std::string sym_name = this->u_.symbol->name(); | |
1817 | // We need to print two hex number and two colons. So just add 100 bytes | |
1818 | // to the symbol name size. | |
1819 | size_t len = sym_name.size() + 100; | |
1820 | char* buffer = new char[len]; | |
1821 | int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_, | |
1822 | sym_name.c_str(), this->addend_); | |
1823 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
1824 | delete[] buffer; | |
1825 | return std::string(buffer); | |
1826 | } | |
1827 | else | |
1828 | { | |
1829 | // local symbol key name | |
1830 | // <stub-type>:<object>:<r_sym>:<addend>. | |
1831 | const size_t len = 200; | |
1832 | char buffer[len]; | |
1833 | int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_, | |
1834 | this->u_.relobj, this->r_sym_, this->addend_); | |
1835 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
1836 | return std::string(buffer); | |
1837 | } | |
1838 | } | |
1839 | ||
1840 | // Reloc_stub methods. | |
1841 | ||
1842 | // Determine the type of stub needed, if any, for a relocation of R_TYPE at | |
1843 | // LOCATION to DESTINATION. | |
1844 | // This code is based on the arm_type_of_stub function in | |
1845 | // bfd/elf32-arm.c. We have changed the interface a liitle to keep the Stub | |
1846 | // class simple. | |
1847 | ||
1848 | Stub_type | |
1849 | Reloc_stub::stub_type_for_reloc( | |
1850 | unsigned int r_type, | |
1851 | Arm_address location, | |
1852 | Arm_address destination, | |
1853 | bool target_is_thumb) | |
1854 | { | |
1855 | Stub_type stub_type = arm_stub_none; | |
1856 | ||
1857 | // This is a bit ugly but we want to avoid using a templated class for | |
1858 | // big and little endianities. | |
1859 | bool may_use_blx; | |
1860 | bool should_force_pic_veneer; | |
1861 | bool thumb2; | |
1862 | bool thumb_only; | |
1863 | if (parameters->target().is_big_endian()) | |
1864 | { | |
1865 | const Target_arm<true>& big_endian_target = | |
1866 | Target_arm<true>::default_target(); | |
1867 | may_use_blx = big_endian_target.may_use_blx(); | |
1868 | should_force_pic_veneer = big_endian_target.should_force_pic_veneer(); | |
1869 | thumb2 = big_endian_target.using_thumb2(); | |
1870 | thumb_only = big_endian_target.using_thumb_only(); | |
1871 | } | |
1872 | else | |
1873 | { | |
1874 | const Target_arm<false>& little_endian_target = | |
1875 | Target_arm<false>::default_target(); | |
1876 | may_use_blx = little_endian_target.may_use_blx(); | |
1877 | should_force_pic_veneer = little_endian_target.should_force_pic_veneer(); | |
1878 | thumb2 = little_endian_target.using_thumb2(); | |
1879 | thumb_only = little_endian_target.using_thumb_only(); | |
1880 | } | |
1881 | ||
1882 | int64_t branch_offset = (int64_t)destination - location; | |
1883 | ||
1884 | if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24) | |
1885 | { | |
1886 | // Handle cases where: | |
1887 | // - this call goes too far (different Thumb/Thumb2 max | |
1888 | // distance) | |
1889 | // - it's a Thumb->Arm call and blx is not available, or it's a | |
1890 | // Thumb->Arm branch (not bl). A stub is needed in this case. | |
1891 | if ((!thumb2 | |
1892 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
1893 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
1894 | || (thumb2 | |
1895 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
1896 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
1897 | || ((!target_is_thumb) | |
1898 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
1899 | || (r_type == elfcpp::R_ARM_THM_JUMP24)))) | |
1900 | { | |
1901 | if (target_is_thumb) | |
1902 | { | |
1903 | // Thumb to thumb. | |
1904 | if (!thumb_only) | |
1905 | { | |
1906 | stub_type = (parameters->options().shared() | should_force_pic_veneer) | |
1907 | // PIC stubs. | |
1908 | ? ((may_use_blx | |
1909 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
1910 | // V5T and above. Stub starts with ARM code, so | |
1911 | // we must be able to switch mode before | |
1912 | // reaching it, which is only possible for 'bl' | |
1913 | // (ie R_ARM_THM_CALL relocation). | |
1914 | ? arm_stub_long_branch_any_thumb_pic | |
1915 | // On V4T, use Thumb code only. | |
1916 | : arm_stub_long_branch_v4t_thumb_thumb_pic) | |
1917 | ||
1918 | // non-PIC stubs. | |
1919 | : ((may_use_blx | |
1920 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
1921 | ? arm_stub_long_branch_any_any // V5T and above. | |
1922 | : arm_stub_long_branch_v4t_thumb_thumb); // V4T. | |
1923 | } | |
1924 | else | |
1925 | { | |
1926 | stub_type = (parameters->options().shared() | should_force_pic_veneer) | |
1927 | ? arm_stub_long_branch_thumb_only_pic // PIC stub. | |
1928 | : arm_stub_long_branch_thumb_only; // non-PIC stub. | |
1929 | } | |
1930 | } | |
1931 | else | |
1932 | { | |
1933 | // Thumb to arm. | |
1934 | ||
1935 | // FIXME: We should check that the input section is from an | |
1936 | // object that has interwork enabled. | |
1937 | ||
1938 | stub_type = (parameters->options().shared() | |
1939 | || should_force_pic_veneer) | |
1940 | // PIC stubs. | |
1941 | ? ((may_use_blx | |
1942 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
1943 | ? arm_stub_long_branch_any_arm_pic // V5T and above. | |
1944 | : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T. | |
1945 | ||
1946 | // non-PIC stubs. | |
1947 | : ((may_use_blx | |
1948 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
1949 | ? arm_stub_long_branch_any_any // V5T and above. | |
1950 | : arm_stub_long_branch_v4t_thumb_arm); // V4T. | |
1951 | ||
1952 | // Handle v4t short branches. | |
1953 | if ((stub_type == arm_stub_long_branch_v4t_thumb_arm) | |
1954 | && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET) | |
1955 | && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET)) | |
1956 | stub_type = arm_stub_short_branch_v4t_thumb_arm; | |
1957 | } | |
1958 | } | |
1959 | } | |
1960 | else if (r_type == elfcpp::R_ARM_CALL | |
1961 | || r_type == elfcpp::R_ARM_JUMP24 | |
1962 | || r_type == elfcpp::R_ARM_PLT32) | |
1963 | { | |
1964 | if (target_is_thumb) | |
1965 | { | |
1966 | // Arm to thumb. | |
1967 | ||
1968 | // FIXME: We should check that the input section is from an | |
1969 | // object that has interwork enabled. | |
1970 | ||
1971 | // We have an extra 2-bytes reach because of | |
1972 | // the mode change (bit 24 (H) of BLX encoding). | |
1973 | if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2) | |
1974 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
1975 | || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx) | |
1976 | || (r_type == elfcpp::R_ARM_JUMP24) | |
1977 | || (r_type == elfcpp::R_ARM_PLT32)) | |
1978 | { | |
1979 | stub_type = (parameters->options().shared() | |
1980 | || should_force_pic_veneer) | |
1981 | // PIC stubs. | |
1982 | ? (may_use_blx | |
1983 | ? arm_stub_long_branch_any_thumb_pic// V5T and above. | |
1984 | : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub. | |
1985 | ||
1986 | // non-PIC stubs. | |
1987 | : (may_use_blx | |
1988 | ? arm_stub_long_branch_any_any // V5T and above. | |
1989 | : arm_stub_long_branch_v4t_arm_thumb); // V4T. | |
1990 | } | |
1991 | } | |
1992 | else | |
1993 | { | |
1994 | // Arm to arm. | |
1995 | if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET | |
1996 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)) | |
1997 | { | |
1998 | stub_type = (parameters->options().shared() | |
1999 | || should_force_pic_veneer) | |
2000 | ? arm_stub_long_branch_any_arm_pic // PIC stubs. | |
2001 | : arm_stub_long_branch_any_any; /// non-PIC. | |
2002 | } | |
2003 | } | |
2004 | } | |
2005 | ||
2006 | return stub_type; | |
2007 | } | |
2008 | ||
2009 | // Template to implement do_write for a specific target endianity. | |
2010 | ||
2011 | template<bool big_endian> | |
2012 | void inline | |
2013 | Reloc_stub::do_fixed_endian_write(unsigned char* view, | |
2014 | section_size_type view_size) | |
2015 | { | |
2016 | const Stub_template* stub_template = this->stub_template(); | |
2017 | const Insn_template* insns = stub_template->insns(); | |
2018 | ||
2019 | // FIXME: We do not handle BE8 encoding yet. | |
2020 | unsigned char* pov = view; | |
2021 | for (size_t i = 0; i < stub_template->insn_count(); i++) | |
2022 | { | |
2023 | switch (insns[i].type()) | |
2024 | { | |
2025 | case Insn_template::THUMB16_TYPE: | |
2026 | // Non-zero reloc addends are only used in Cortex-A8 stubs. | |
2027 | gold_assert(insns[i].reloc_addend() == 0); | |
2028 | elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff); | |
2029 | break; | |
2030 | case Insn_template::THUMB32_TYPE: | |
2031 | { | |
2032 | uint32_t hi = (insns[i].data() >> 16) & 0xffff; | |
2033 | uint32_t lo = insns[i].data() & 0xffff; | |
2034 | elfcpp::Swap<16, big_endian>::writeval(pov, hi); | |
2035 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo); | |
2036 | } | |
2037 | break; | |
2038 | case Insn_template::ARM_TYPE: | |
2039 | case Insn_template::DATA_TYPE: | |
2040 | elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data()); | |
2041 | break; | |
2042 | default: | |
2043 | gold_unreachable(); | |
2044 | } | |
2045 | pov += insns[i].size(); | |
2046 | } | |
2047 | gold_assert(static_cast<section_size_type>(pov - view) == view_size); | |
2048 | } | |
2049 | ||
2050 | // Write a reloc stub to VIEW with endianity specified by BIG_ENDIAN. | |
2051 | ||
2052 | void | |
2053 | Reloc_stub::do_write(unsigned char* view, section_size_type view_size, | |
2054 | bool big_endian) | |
2055 | { | |
2056 | if (big_endian) | |
2057 | this->do_fixed_endian_write<true>(view, view_size); | |
2058 | else | |
2059 | this->do_fixed_endian_write<false>(view, view_size); | |
2060 | } | |
2061 | ||
2062 | // Stub_factory methods. | |
2063 | ||
2064 | Stub_factory::Stub_factory() | |
2065 | { | |
2066 | // The instruction template sequences are declared as static | |
2067 | // objects and initialized first time the constructor runs. | |
2068 | ||
2069 | // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx | |
2070 | // to reach the stub if necessary. | |
2071 | static const Insn_template elf32_arm_stub_long_branch_any_any[] = | |
2072 | { | |
2073 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
2074 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2075 | // dcd R_ARM_ABS32(X) | |
2076 | }; | |
2077 | ||
2078 | // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not | |
2079 | // available. | |
2080 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] = | |
2081 | { | |
2082 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
2083 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2084 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2085 | // dcd R_ARM_ABS32(X) | |
2086 | }; | |
2087 | ||
2088 | // Thumb -> Thumb long branch stub. Used on M-profile architectures. | |
2089 | static const Insn_template elf32_arm_stub_long_branch_thumb_only[] = | |
2090 | { | |
2091 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
2092 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
2093 | Insn_template::thumb16_insn(0x4684), // mov ip, r0 | |
2094 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
2095 | Insn_template::thumb16_insn(0x4760), // bx ip | |
2096 | Insn_template::thumb16_insn(0xbf00), // nop | |
2097 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2098 | // dcd R_ARM_ABS32(X) | |
2099 | }; | |
2100 | ||
2101 | // V4T Thumb -> Thumb long branch stub. Using the stack is not | |
2102 | // allowed. | |
2103 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] = | |
2104 | { | |
2105 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2106 | Insn_template::thumb16_insn(0x46c0), // nop | |
2107 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
2108 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2109 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2110 | // dcd R_ARM_ABS32(X) | |
2111 | }; | |
2112 | ||
2113 | // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not | |
2114 | // available. | |
2115 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] = | |
2116 | { | |
2117 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2118 | Insn_template::thumb16_insn(0x46c0), // nop | |
2119 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
2120 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2121 | // dcd R_ARM_ABS32(X) | |
2122 | }; | |
2123 | ||
2124 | // V4T Thumb -> ARM short branch stub. Shorter variant of the above | |
2125 | // one, when the destination is close enough. | |
2126 | static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] = | |
2127 | { | |
2128 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2129 | Insn_template::thumb16_insn(0x46c0), // nop | |
2130 | Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8) | |
2131 | }; | |
2132 | ||
2133 | // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use | |
2134 | // blx to reach the stub if necessary. | |
2135 | static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] = | |
2136 | { | |
2137 | Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc] | |
2138 | Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip | |
2139 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
2140 | // dcd R_ARM_REL32(X-4) | |
2141 | }; | |
2142 | ||
2143 | // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use | |
2144 | // blx to reach the stub if necessary. We can not add into pc; | |
2145 | // it is not guaranteed to mode switch (different in ARMv6 and | |
2146 | // ARMv7). | |
2147 | static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] = | |
2148 | { | |
2149 | Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4] | |
2150 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
2151 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2152 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
2153 | // dcd R_ARM_REL32(X) | |
2154 | }; | |
2155 | ||
2156 | // V4T ARM -> ARM long branch stub, PIC. | |
2157 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] = | |
2158 | { | |
2159 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
2160 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
2161 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2162 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
2163 | // dcd R_ARM_REL32(X) | |
2164 | }; | |
2165 | ||
2166 | // V4T Thumb -> ARM long branch stub, PIC. | |
2167 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] = | |
2168 | { | |
2169 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2170 | Insn_template::thumb16_insn(0x46c0), // nop | |
2171 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
2172 | Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc | |
2173 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
2174 | // dcd R_ARM_REL32(X) | |
2175 | }; | |
2176 | ||
2177 | // Thumb -> Thumb long branch stub, PIC. Used on M-profile | |
2178 | // architectures. | |
2179 | static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] = | |
2180 | { | |
2181 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
2182 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
2183 | Insn_template::thumb16_insn(0x46fc), // mov ip, pc | |
2184 | Insn_template::thumb16_insn(0x4484), // add ip, r0 | |
2185 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
2186 | Insn_template::thumb16_insn(0x4760), // bx ip | |
2187 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4), | |
2188 | // dcd R_ARM_REL32(X) | |
2189 | }; | |
2190 | ||
2191 | // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not | |
2192 | // allowed. | |
2193 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] = | |
2194 | { | |
2195 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2196 | Insn_template::thumb16_insn(0x46c0), // nop | |
2197 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
2198 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
2199 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2200 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
2201 | // dcd R_ARM_REL32(X) | |
2202 | }; | |
2203 | ||
2204 | // Cortex-A8 erratum-workaround stubs. | |
2205 | ||
2206 | // Stub used for conditional branches (which may be beyond +/-1MB away, | |
2207 | // so we can't use a conditional branch to reach this stub). | |
2208 | ||
2209 | // original code: | |
2210 | // | |
2211 | // b<cond> X | |
2212 | // after: | |
2213 | // | |
2214 | static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] = | |
2215 | { | |
2216 | Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true | |
2217 | Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after | |
2218 | Insn_template::thumb32_b_insn(0xf000b800, -4) // true: | |
2219 | // b.w X | |
2220 | }; | |
2221 | ||
2222 | // Stub used for b.w and bl.w instructions. | |
2223 | ||
2224 | static const Insn_template elf32_arm_stub_a8_veneer_b[] = | |
2225 | { | |
2226 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
2227 | }; | |
2228 | ||
2229 | static const Insn_template elf32_arm_stub_a8_veneer_bl[] = | |
2230 | { | |
2231 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
2232 | }; | |
2233 | ||
2234 | // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w | |
2235 | // instruction (which switches to ARM mode) to point to this stub. Jump to | |
2236 | // the real destination using an ARM-mode branch. | |
2237 | const Insn_template elf32_arm_stub_a8_veneer_blx[] = | |
2238 | { | |
2239 | Insn_template::arm_rel_insn(0xea000000, -8) // b dest | |
2240 | }; | |
2241 | ||
2242 | // Fill in the stub template look-up table. Stub templates are constructed | |
2243 | // per instance of Stub_factory for fast look-up without locking | |
2244 | // in a thread-enabled environment. | |
2245 | ||
2246 | this->stub_templates_[arm_stub_none] = | |
2247 | new Stub_template(arm_stub_none, NULL, 0); | |
2248 | ||
2249 | #define DEF_STUB(x) \ | |
2250 | do \ | |
2251 | { \ | |
2252 | size_t array_size \ | |
2253 | = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \ | |
2254 | Stub_type type = arm_stub_##x; \ | |
2255 | this->stub_templates_[type] = \ | |
2256 | new Stub_template(type, elf32_arm_stub_##x, array_size); \ | |
2257 | } \ | |
2258 | while (0); | |
2259 | ||
2260 | DEF_STUBS | |
2261 | #undef DEF_STUB | |
2262 | } | |
2263 | ||
94cdfcff DK |
2264 | // A class to handle the PLT data. |
2265 | ||
2266 | template<bool big_endian> | |
2267 | class Output_data_plt_arm : public Output_section_data | |
2268 | { | |
2269 | public: | |
2270 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
2271 | Reloc_section; | |
2272 | ||
2273 | Output_data_plt_arm(Layout*, Output_data_space*); | |
2274 | ||
2275 | // Add an entry to the PLT. | |
2276 | void | |
2277 | add_entry(Symbol* gsym); | |
2278 | ||
2279 | // Return the .rel.plt section data. | |
2280 | const Reloc_section* | |
2281 | rel_plt() const | |
2282 | { return this->rel_; } | |
2283 | ||
2284 | protected: | |
2285 | void | |
2286 | do_adjust_output_section(Output_section* os); | |
2287 | ||
2288 | // Write to a map file. | |
2289 | void | |
2290 | do_print_to_mapfile(Mapfile* mapfile) const | |
2291 | { mapfile->print_output_data(this, _("** PLT")); } | |
2292 | ||
2293 | private: | |
2294 | // Template for the first PLT entry. | |
2295 | static const uint32_t first_plt_entry[5]; | |
2296 | ||
2297 | // Template for subsequent PLT entries. | |
2298 | static const uint32_t plt_entry[3]; | |
2299 | ||
2300 | // Set the final size. | |
2301 | void | |
2302 | set_final_data_size() | |
2303 | { | |
2304 | this->set_data_size(sizeof(first_plt_entry) | |
2305 | + this->count_ * sizeof(plt_entry)); | |
2306 | } | |
2307 | ||
2308 | // Write out the PLT data. | |
2309 | void | |
2310 | do_write(Output_file*); | |
2311 | ||
2312 | // The reloc section. | |
2313 | Reloc_section* rel_; | |
2314 | // The .got.plt section. | |
2315 | Output_data_space* got_plt_; | |
2316 | // The number of PLT entries. | |
2317 | unsigned int count_; | |
2318 | }; | |
2319 | ||
2320 | // Create the PLT section. The ordinary .got section is an argument, | |
2321 | // since we need to refer to the start. We also create our own .got | |
2322 | // section just for PLT entries. | |
2323 | ||
2324 | template<bool big_endian> | |
2325 | Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout, | |
2326 | Output_data_space* got_plt) | |
2327 | : Output_section_data(4), got_plt_(got_plt), count_(0) | |
2328 | { | |
2329 | this->rel_ = new Reloc_section(false); | |
2330 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
2331 | elfcpp::SHF_ALLOC, this->rel_); | |
2332 | } | |
2333 | ||
2334 | template<bool big_endian> | |
2335 | void | |
2336 | Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os) | |
2337 | { | |
2338 | os->set_entsize(0); | |
2339 | } | |
2340 | ||
2341 | // Add an entry to the PLT. | |
2342 | ||
2343 | template<bool big_endian> | |
2344 | void | |
2345 | Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym) | |
2346 | { | |
2347 | gold_assert(!gsym->has_plt_offset()); | |
2348 | ||
2349 | // Note that when setting the PLT offset we skip the initial | |
2350 | // reserved PLT entry. | |
2351 | gsym->set_plt_offset((this->count_) * sizeof(plt_entry) | |
2352 | + sizeof(first_plt_entry)); | |
2353 | ||
2354 | ++this->count_; | |
2355 | ||
2356 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
2357 | ||
2358 | // Every PLT entry needs a GOT entry which points back to the PLT | |
2359 | // entry (this will be changed by the dynamic linker, normally | |
2360 | // lazily when the function is called). | |
2361 | this->got_plt_->set_current_data_size(got_offset + 4); | |
2362 | ||
2363 | // Every PLT entry needs a reloc. | |
2364 | gsym->set_needs_dynsym_entry(); | |
2365 | this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_, | |
2366 | got_offset); | |
2367 | ||
2368 | // Note that we don't need to save the symbol. The contents of the | |
2369 | // PLT are independent of which symbols are used. The symbols only | |
2370 | // appear in the relocations. | |
2371 | } | |
2372 | ||
2373 | // ARM PLTs. | |
2374 | // FIXME: This is not very flexible. Right now this has only been tested | |
2375 | // on armv5te. If we are to support additional architecture features like | |
2376 | // Thumb-2 or BE8, we need to make this more flexible like GNU ld. | |
2377 | ||
2378 | // The first entry in the PLT. | |
2379 | template<bool big_endian> | |
2380 | const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] = | |
2381 | { | |
2382 | 0xe52de004, // str lr, [sp, #-4]! | |
2383 | 0xe59fe004, // ldr lr, [pc, #4] | |
2384 | 0xe08fe00e, // add lr, pc, lr | |
2385 | 0xe5bef008, // ldr pc, [lr, #8]! | |
2386 | 0x00000000, // &GOT[0] - . | |
2387 | }; | |
2388 | ||
2389 | // Subsequent entries in the PLT. | |
2390 | ||
2391 | template<bool big_endian> | |
2392 | const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] = | |
2393 | { | |
2394 | 0xe28fc600, // add ip, pc, #0xNN00000 | |
2395 | 0xe28cca00, // add ip, ip, #0xNN000 | |
2396 | 0xe5bcf000, // ldr pc, [ip, #0xNNN]! | |
2397 | }; | |
2398 | ||
2399 | // Write out the PLT. This uses the hand-coded instructions above, | |
2400 | // and adjusts them as needed. This is all specified by the arm ELF | |
2401 | // Processor Supplement. | |
2402 | ||
2403 | template<bool big_endian> | |
2404 | void | |
2405 | Output_data_plt_arm<big_endian>::do_write(Output_file* of) | |
2406 | { | |
2407 | const off_t offset = this->offset(); | |
2408 | const section_size_type oview_size = | |
2409 | convert_to_section_size_type(this->data_size()); | |
2410 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
2411 | ||
2412 | const off_t got_file_offset = this->got_plt_->offset(); | |
2413 | const section_size_type got_size = | |
2414 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2415 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
2416 | got_size); | |
2417 | unsigned char* pov = oview; | |
2418 | ||
2419 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
2420 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
2421 | ||
2422 | // Write first PLT entry. All but the last word are constants. | |
2423 | const size_t num_first_plt_words = (sizeof(first_plt_entry) | |
2424 | / sizeof(plt_entry[0])); | |
2425 | for (size_t i = 0; i < num_first_plt_words - 1; i++) | |
2426 | elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]); | |
2427 | // Last word in first PLT entry is &GOT[0] - . | |
2428 | elfcpp::Swap<32, big_endian>::writeval(pov + 16, | |
2429 | got_address - (plt_address + 16)); | |
2430 | pov += sizeof(first_plt_entry); | |
2431 | ||
2432 | unsigned char* got_pov = got_view; | |
2433 | ||
2434 | memset(got_pov, 0, 12); | |
2435 | got_pov += 12; | |
2436 | ||
2437 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
2438 | unsigned int plt_offset = sizeof(first_plt_entry); | |
2439 | unsigned int plt_rel_offset = 0; | |
2440 | unsigned int got_offset = 12; | |
2441 | const unsigned int count = this->count_; | |
2442 | for (unsigned int i = 0; | |
2443 | i < count; | |
2444 | ++i, | |
2445 | pov += sizeof(plt_entry), | |
2446 | got_pov += 4, | |
2447 | plt_offset += sizeof(plt_entry), | |
2448 | plt_rel_offset += rel_size, | |
2449 | got_offset += 4) | |
2450 | { | |
2451 | // Set and adjust the PLT entry itself. | |
2452 | int32_t offset = ((got_address + got_offset) | |
2453 | - (plt_address + plt_offset + 8)); | |
2454 | ||
2455 | gold_assert(offset >= 0 && offset < 0x0fffffff); | |
2456 | uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff); | |
2457 | elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0); | |
2458 | uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff); | |
2459 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1); | |
2460 | uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff); | |
2461 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2); | |
2462 | ||
2463 | // Set the entry in the GOT. | |
2464 | elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address); | |
2465 | } | |
2466 | ||
2467 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
2468 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2469 | ||
2470 | of->write_output_view(offset, oview_size, oview); | |
2471 | of->write_output_view(got_file_offset, got_size, got_view); | |
2472 | } | |
2473 | ||
2474 | // Create a PLT entry for a global symbol. | |
2475 | ||
2476 | template<bool big_endian> | |
2477 | void | |
2478 | Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
2479 | Symbol* gsym) | |
2480 | { | |
2481 | if (gsym->has_plt_offset()) | |
2482 | return; | |
2483 | ||
2484 | if (this->plt_ == NULL) | |
2485 | { | |
2486 | // Create the GOT sections first. | |
2487 | this->got_section(symtab, layout); | |
2488 | ||
2489 | this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_); | |
2490 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
2491 | (elfcpp::SHF_ALLOC | |
2492 | | elfcpp::SHF_EXECINSTR), | |
2493 | this->plt_); | |
2494 | } | |
2495 | this->plt_->add_entry(gsym); | |
2496 | } | |
2497 | ||
4a657b0d DK |
2498 | // Report an unsupported relocation against a local symbol. |
2499 | ||
2500 | template<bool big_endian> | |
2501 | void | |
2502 | Target_arm<big_endian>::Scan::unsupported_reloc_local( | |
2503 | Sized_relobj<32, big_endian>* object, | |
2504 | unsigned int r_type) | |
2505 | { | |
2506 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
2507 | object->name().c_str(), r_type); | |
2508 | } | |
2509 | ||
bec53400 DK |
2510 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
2511 | // dynamic linker does not support it, issue an error. The GNU linker | |
2512 | // only issues a non-PIC error for an allocated read-only section. | |
2513 | // Here we know the section is allocated, but we don't know that it is | |
2514 | // read-only. But we check for all the relocation types which the | |
2515 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
2516 | // error even if the section is not read-only. | |
2517 | ||
2518 | template<bool big_endian> | |
2519 | void | |
2520 | Target_arm<big_endian>::Scan::check_non_pic(Relobj* object, | |
2521 | unsigned int r_type) | |
2522 | { | |
2523 | switch (r_type) | |
2524 | { | |
2525 | // These are the relocation types supported by glibc for ARM. | |
2526 | case elfcpp::R_ARM_RELATIVE: | |
2527 | case elfcpp::R_ARM_COPY: | |
2528 | case elfcpp::R_ARM_GLOB_DAT: | |
2529 | case elfcpp::R_ARM_JUMP_SLOT: | |
2530 | case elfcpp::R_ARM_ABS32: | |
be8fcb75 | 2531 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
2532 | case elfcpp::R_ARM_PC24: |
2533 | // FIXME: The following 3 types are not supported by Android's dynamic | |
2534 | // linker. | |
2535 | case elfcpp::R_ARM_TLS_DTPMOD32: | |
2536 | case elfcpp::R_ARM_TLS_DTPOFF32: | |
2537 | case elfcpp::R_ARM_TLS_TPOFF32: | |
2538 | return; | |
2539 | ||
2540 | default: | |
2541 | // This prevents us from issuing more than one error per reloc | |
2542 | // section. But we can still wind up issuing more than one | |
2543 | // error per object file. | |
2544 | if (this->issued_non_pic_error_) | |
2545 | return; | |
2546 | object->error(_("requires unsupported dynamic reloc; " | |
2547 | "recompile with -fPIC")); | |
2548 | this->issued_non_pic_error_ = true; | |
2549 | return; | |
2550 | ||
2551 | case elfcpp::R_ARM_NONE: | |
2552 | gold_unreachable(); | |
2553 | } | |
2554 | } | |
2555 | ||
4a657b0d | 2556 | // Scan a relocation for a local symbol. |
bec53400 DK |
2557 | // FIXME: This only handles a subset of relocation types used by Android |
2558 | // on ARM v5te devices. | |
4a657b0d DK |
2559 | |
2560 | template<bool big_endian> | |
2561 | inline void | |
2562 | Target_arm<big_endian>::Scan::local(const General_options&, | |
bec53400 DK |
2563 | Symbol_table* symtab, |
2564 | Layout* layout, | |
2565 | Target_arm* target, | |
4a657b0d | 2566 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
2567 | unsigned int data_shndx, |
2568 | Output_section* output_section, | |
2569 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
2570 | unsigned int r_type, |
2571 | const elfcpp::Sym<32, big_endian>&) | |
2572 | { | |
2573 | r_type = get_real_reloc_type(r_type); | |
2574 | switch (r_type) | |
2575 | { | |
2576 | case elfcpp::R_ARM_NONE: | |
2577 | break; | |
2578 | ||
bec53400 | 2579 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 2580 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
2581 | // If building a shared library (or a position-independent |
2582 | // executable), we need to create a dynamic relocation for | |
2583 | // this location. The relocation applied at link time will | |
2584 | // apply the link-time value, so we flag the location with | |
2585 | // an R_ARM_RELATIVE relocation so the dynamic loader can | |
2586 | // relocate it easily. | |
2587 | if (parameters->options().output_is_position_independent()) | |
2588 | { | |
2589 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2590 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2591 | // If we are to add more other reloc types than R_ARM_ABS32, | |
2592 | // we need to add check_non_pic(object, r_type) here. | |
2593 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE, | |
2594 | output_section, data_shndx, | |
2595 | reloc.get_r_offset()); | |
2596 | } | |
2597 | break; | |
2598 | ||
2599 | case elfcpp::R_ARM_REL32: | |
2600 | case elfcpp::R_ARM_THM_CALL: | |
2601 | case elfcpp::R_ARM_CALL: | |
2602 | case elfcpp::R_ARM_PREL31: | |
2603 | case elfcpp::R_ARM_JUMP24: | |
2604 | case elfcpp::R_ARM_PLT32: | |
be8fcb75 ILT |
2605 | case elfcpp::R_ARM_THM_ABS5: |
2606 | case elfcpp::R_ARM_ABS8: | |
2607 | case elfcpp::R_ARM_ABS12: | |
2608 | case elfcpp::R_ARM_ABS16: | |
2609 | case elfcpp::R_ARM_BASE_ABS: | |
fd3c5f0b ILT |
2610 | case elfcpp::R_ARM_MOVW_ABS_NC: |
2611 | case elfcpp::R_ARM_MOVT_ABS: | |
2612 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
2613 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
2614 | case elfcpp::R_ARM_MOVW_PREL_NC: |
2615 | case elfcpp::R_ARM_MOVT_PREL: | |
2616 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
2617 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
bec53400 DK |
2618 | break; |
2619 | ||
2620 | case elfcpp::R_ARM_GOTOFF32: | |
2621 | // We need a GOT section: | |
2622 | target->got_section(symtab, layout); | |
2623 | break; | |
2624 | ||
2625 | case elfcpp::R_ARM_BASE_PREL: | |
2626 | // FIXME: What about this? | |
2627 | break; | |
2628 | ||
2629 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 2630 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
2631 | { |
2632 | // The symbol requires a GOT entry. | |
2633 | Output_data_got<32, big_endian>* got = | |
2634 | target->got_section(symtab, layout); | |
2635 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2636 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) | |
2637 | { | |
2638 | // If we are generating a shared object, we need to add a | |
2639 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
2640 | if (parameters->options().output_is_position_independent()) | |
2641 | { | |
2642 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2643 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
2644 | rel_dyn->add_local_relative( | |
2645 | object, r_sym, elfcpp::R_ARM_RELATIVE, got, | |
2646 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
2647 | } | |
2648 | } | |
2649 | } | |
2650 | break; | |
2651 | ||
2652 | case elfcpp::R_ARM_TARGET1: | |
2653 | // This should have been mapped to another type already. | |
2654 | // Fall through. | |
2655 | case elfcpp::R_ARM_COPY: | |
2656 | case elfcpp::R_ARM_GLOB_DAT: | |
2657 | case elfcpp::R_ARM_JUMP_SLOT: | |
2658 | case elfcpp::R_ARM_RELATIVE: | |
2659 | // These are relocations which should only be seen by the | |
2660 | // dynamic linker, and should never be seen here. | |
2661 | gold_error(_("%s: unexpected reloc %u in object file"), | |
2662 | object->name().c_str(), r_type); | |
2663 | break; | |
2664 | ||
4a657b0d DK |
2665 | default: |
2666 | unsupported_reloc_local(object, r_type); | |
2667 | break; | |
2668 | } | |
2669 | } | |
2670 | ||
2671 | // Report an unsupported relocation against a global symbol. | |
2672 | ||
2673 | template<bool big_endian> | |
2674 | void | |
2675 | Target_arm<big_endian>::Scan::unsupported_reloc_global( | |
2676 | Sized_relobj<32, big_endian>* object, | |
2677 | unsigned int r_type, | |
2678 | Symbol* gsym) | |
2679 | { | |
2680 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
2681 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
2682 | } | |
2683 | ||
2684 | // Scan a relocation for a global symbol. | |
bec53400 DK |
2685 | // FIXME: This only handles a subset of relocation types used by Android |
2686 | // on ARM v5te devices. | |
4a657b0d DK |
2687 | |
2688 | template<bool big_endian> | |
2689 | inline void | |
2690 | Target_arm<big_endian>::Scan::global(const General_options&, | |
bec53400 DK |
2691 | Symbol_table* symtab, |
2692 | Layout* layout, | |
2693 | Target_arm* target, | |
4a657b0d | 2694 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
2695 | unsigned int data_shndx, |
2696 | Output_section* output_section, | |
2697 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
2698 | unsigned int r_type, |
2699 | Symbol* gsym) | |
2700 | { | |
2701 | r_type = get_real_reloc_type(r_type); | |
2702 | switch (r_type) | |
2703 | { | |
2704 | case elfcpp::R_ARM_NONE: | |
2705 | break; | |
2706 | ||
bec53400 | 2707 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 2708 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
2709 | { |
2710 | // Make a dynamic relocation if necessary. | |
2711 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) | |
2712 | { | |
2713 | if (target->may_need_copy_reloc(gsym)) | |
2714 | { | |
2715 | target->copy_reloc(symtab, layout, object, | |
2716 | data_shndx, output_section, gsym, reloc); | |
2717 | } | |
2718 | else if (gsym->can_use_relative_reloc(false)) | |
2719 | { | |
2720 | // If we are to add more other reloc types than R_ARM_ABS32, | |
2721 | // we need to add check_non_pic(object, r_type) here. | |
2722 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2723 | rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE, | |
2724 | output_section, object, | |
2725 | data_shndx, reloc.get_r_offset()); | |
2726 | } | |
2727 | else | |
2728 | { | |
2729 | // If we are to add more other reloc types than R_ARM_ABS32, | |
2730 | // we need to add check_non_pic(object, r_type) here. | |
2731 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2732 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2733 | data_shndx, reloc.get_r_offset()); | |
2734 | } | |
2735 | } | |
2736 | } | |
2737 | break; | |
2738 | ||
fd3c5f0b ILT |
2739 | case elfcpp::R_ARM_MOVW_ABS_NC: |
2740 | case elfcpp::R_ARM_MOVT_ABS: | |
2741 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
2742 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
2743 | case elfcpp::R_ARM_MOVW_PREL_NC: |
2744 | case elfcpp::R_ARM_MOVT_PREL: | |
2745 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
2746 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
fd3c5f0b ILT |
2747 | break; |
2748 | ||
be8fcb75 ILT |
2749 | case elfcpp::R_ARM_THM_ABS5: |
2750 | case elfcpp::R_ARM_ABS8: | |
2751 | case elfcpp::R_ARM_ABS12: | |
2752 | case elfcpp::R_ARM_ABS16: | |
2753 | case elfcpp::R_ARM_BASE_ABS: | |
2754 | { | |
2755 | // No dynamic relocs of this kinds. | |
2756 | // Report the error in case of PIC. | |
2757 | int flags = Symbol::NON_PIC_REF; | |
2758 | if (gsym->type() == elfcpp::STT_FUNC | |
2759 | || gsym->type() == elfcpp::STT_ARM_TFUNC) | |
2760 | flags |= Symbol::FUNCTION_CALL; | |
2761 | if (gsym->needs_dynamic_reloc(flags)) | |
2762 | check_non_pic(object, r_type); | |
2763 | } | |
2764 | break; | |
2765 | ||
bec53400 DK |
2766 | case elfcpp::R_ARM_REL32: |
2767 | case elfcpp::R_ARM_PREL31: | |
2768 | { | |
2769 | // Make a dynamic relocation if necessary. | |
2770 | int flags = Symbol::NON_PIC_REF; | |
2771 | if (gsym->needs_dynamic_reloc(flags)) | |
2772 | { | |
2773 | if (target->may_need_copy_reloc(gsym)) | |
2774 | { | |
2775 | target->copy_reloc(symtab, layout, object, | |
2776 | data_shndx, output_section, gsym, reloc); | |
2777 | } | |
2778 | else | |
2779 | { | |
2780 | check_non_pic(object, r_type); | |
2781 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2782 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2783 | data_shndx, reloc.get_r_offset()); | |
2784 | } | |
2785 | } | |
2786 | } | |
2787 | break; | |
2788 | ||
2789 | case elfcpp::R_ARM_JUMP24: | |
2790 | case elfcpp::R_ARM_THM_CALL: | |
2791 | case elfcpp::R_ARM_CALL: | |
2792 | { | |
2793 | if (Target_arm<big_endian>::Scan::symbol_needs_plt_entry(gsym)) | |
2794 | target->make_plt_entry(symtab, layout, gsym); | |
2795 | // Make a dynamic relocation if necessary. | |
2796 | int flags = Symbol::NON_PIC_REF; | |
2797 | if (gsym->type() == elfcpp::STT_FUNC | |
07800fab | 2798 | || gsym->type() == elfcpp::STT_ARM_TFUNC) |
bec53400 DK |
2799 | flags |= Symbol::FUNCTION_CALL; |
2800 | if (gsym->needs_dynamic_reloc(flags)) | |
2801 | { | |
2802 | if (target->may_need_copy_reloc(gsym)) | |
2803 | { | |
2804 | target->copy_reloc(symtab, layout, object, | |
2805 | data_shndx, output_section, gsym, | |
2806 | reloc); | |
2807 | } | |
2808 | else | |
2809 | { | |
2810 | check_non_pic(object, r_type); | |
2811 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2812 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
2813 | data_shndx, reloc.get_r_offset()); | |
2814 | } | |
2815 | } | |
2816 | } | |
2817 | break; | |
2818 | ||
2819 | case elfcpp::R_ARM_PLT32: | |
2820 | // If the symbol is fully resolved, this is just a relative | |
2821 | // local reloc. Otherwise we need a PLT entry. | |
2822 | if (gsym->final_value_is_known()) | |
2823 | break; | |
2824 | // If building a shared library, we can also skip the PLT entry | |
2825 | // if the symbol is defined in the output file and is protected | |
2826 | // or hidden. | |
2827 | if (gsym->is_defined() | |
2828 | && !gsym->is_from_dynobj() | |
2829 | && !gsym->is_preemptible()) | |
2830 | break; | |
2831 | target->make_plt_entry(symtab, layout, gsym); | |
2832 | break; | |
2833 | ||
2834 | case elfcpp::R_ARM_GOTOFF32: | |
2835 | // We need a GOT section. | |
2836 | target->got_section(symtab, layout); | |
2837 | break; | |
2838 | ||
2839 | case elfcpp::R_ARM_BASE_PREL: | |
2840 | // FIXME: What about this? | |
2841 | break; | |
2842 | ||
2843 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 2844 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
2845 | { |
2846 | // The symbol requires a GOT entry. | |
2847 | Output_data_got<32, big_endian>* got = | |
2848 | target->got_section(symtab, layout); | |
2849 | if (gsym->final_value_is_known()) | |
2850 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2851 | else | |
2852 | { | |
2853 | // If this symbol is not fully resolved, we need to add a | |
2854 | // GOT entry with a dynamic relocation. | |
2855 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
2856 | if (gsym->is_from_dynobj() | |
2857 | || gsym->is_undefined() | |
2858 | || gsym->is_preemptible()) | |
2859 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, | |
2860 | rel_dyn, elfcpp::R_ARM_GLOB_DAT); | |
2861 | else | |
2862 | { | |
2863 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) | |
2864 | rel_dyn->add_global_relative( | |
2865 | gsym, elfcpp::R_ARM_RELATIVE, got, | |
2866 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
2867 | } | |
2868 | } | |
2869 | } | |
2870 | break; | |
2871 | ||
2872 | case elfcpp::R_ARM_TARGET1: | |
2873 | // This should have been mapped to another type already. | |
2874 | // Fall through. | |
2875 | case elfcpp::R_ARM_COPY: | |
2876 | case elfcpp::R_ARM_GLOB_DAT: | |
2877 | case elfcpp::R_ARM_JUMP_SLOT: | |
2878 | case elfcpp::R_ARM_RELATIVE: | |
2879 | // These are relocations which should only be seen by the | |
2880 | // dynamic linker, and should never be seen here. | |
2881 | gold_error(_("%s: unexpected reloc %u in object file"), | |
2882 | object->name().c_str(), r_type); | |
2883 | break; | |
2884 | ||
4a657b0d DK |
2885 | default: |
2886 | unsupported_reloc_global(object, r_type, gsym); | |
2887 | break; | |
2888 | } | |
2889 | } | |
2890 | ||
2891 | // Process relocations for gc. | |
2892 | ||
2893 | template<bool big_endian> | |
2894 | void | |
2895 | Target_arm<big_endian>::gc_process_relocs(const General_options& options, | |
2896 | Symbol_table* symtab, | |
2897 | Layout* layout, | |
2898 | Sized_relobj<32, big_endian>* object, | |
2899 | unsigned int data_shndx, | |
2900 | unsigned int, | |
2901 | const unsigned char* prelocs, | |
2902 | size_t reloc_count, | |
2903 | Output_section* output_section, | |
2904 | bool needs_special_offset_handling, | |
2905 | size_t local_symbol_count, | |
2906 | const unsigned char* plocal_symbols) | |
2907 | { | |
2908 | typedef Target_arm<big_endian> Arm; | |
2909 | typedef typename Target_arm<big_endian>::Scan Scan; | |
2910 | ||
2911 | gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>( | |
2912 | options, | |
2913 | symtab, | |
2914 | layout, | |
2915 | this, | |
2916 | object, | |
2917 | data_shndx, | |
2918 | prelocs, | |
2919 | reloc_count, | |
2920 | output_section, | |
2921 | needs_special_offset_handling, | |
2922 | local_symbol_count, | |
2923 | plocal_symbols); | |
2924 | } | |
2925 | ||
2926 | // Scan relocations for a section. | |
2927 | ||
2928 | template<bool big_endian> | |
2929 | void | |
2930 | Target_arm<big_endian>::scan_relocs(const General_options& options, | |
2931 | Symbol_table* symtab, | |
2932 | Layout* layout, | |
2933 | Sized_relobj<32, big_endian>* object, | |
2934 | unsigned int data_shndx, | |
2935 | unsigned int sh_type, | |
2936 | const unsigned char* prelocs, | |
2937 | size_t reloc_count, | |
2938 | Output_section* output_section, | |
2939 | bool needs_special_offset_handling, | |
2940 | size_t local_symbol_count, | |
2941 | const unsigned char* plocal_symbols) | |
2942 | { | |
2943 | typedef typename Target_arm<big_endian>::Scan Scan; | |
2944 | if (sh_type == elfcpp::SHT_RELA) | |
2945 | { | |
2946 | gold_error(_("%s: unsupported RELA reloc section"), | |
2947 | object->name().c_str()); | |
2948 | return; | |
2949 | } | |
2950 | ||
2951 | gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>( | |
2952 | options, | |
2953 | symtab, | |
2954 | layout, | |
2955 | this, | |
2956 | object, | |
2957 | data_shndx, | |
2958 | prelocs, | |
2959 | reloc_count, | |
2960 | output_section, | |
2961 | needs_special_offset_handling, | |
2962 | local_symbol_count, | |
2963 | plocal_symbols); | |
2964 | } | |
2965 | ||
2966 | // Finalize the sections. | |
2967 | ||
2968 | template<bool big_endian> | |
2969 | void | |
94cdfcff | 2970 | Target_arm<big_endian>::do_finalize_sections(Layout* layout) |
4a657b0d | 2971 | { |
94cdfcff DK |
2972 | // Fill in some more dynamic tags. |
2973 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
2974 | if (odyn != NULL) | |
2975 | { | |
2976 | if (this->got_plt_ != NULL) | |
2977 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
2978 | ||
2979 | if (this->plt_ != NULL) | |
2980 | { | |
2981 | const Output_data* od = this->plt_->rel_plt(); | |
2982 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
2983 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
2984 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
2985 | } | |
2986 | ||
2987 | if (this->rel_dyn_ != NULL) | |
2988 | { | |
2989 | const Output_data* od = this->rel_dyn_; | |
2990 | odyn->add_section_address(elfcpp::DT_REL, od); | |
2991 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
2992 | odyn->add_constant(elfcpp::DT_RELENT, | |
2993 | elfcpp::Elf_sizes<32>::rel_size); | |
2994 | } | |
2995 | ||
2996 | if (!parameters->options().shared()) | |
2997 | { | |
2998 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
2999 | // linker at run time, and used by the debugger. | |
3000 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
3001 | } | |
3002 | } | |
3003 | ||
3004 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
3005 | // relocs. | |
3006 | if (this->copy_relocs_.any_saved_relocs()) | |
3007 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
11af873f DK |
3008 | |
3009 | // For the ARM target, we need to add a PT_ARM_EXIDX segment for | |
3010 | // the .ARM.exidx section. | |
3011 | if (!layout->script_options()->saw_phdrs_clause() | |
3012 | && !parameters->options().relocatable()) | |
3013 | { | |
3014 | Output_section* exidx_section = | |
3015 | layout->find_output_section(".ARM.exidx"); | |
3016 | ||
3017 | if (exidx_section != NULL | |
3018 | && exidx_section->type() == elfcpp::SHT_ARM_EXIDX) | |
3019 | { | |
3020 | gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0, 0) | |
3021 | == NULL); | |
3022 | Output_segment* exidx_segment = | |
3023 | layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R); | |
3024 | exidx_segment->add_output_section(exidx_section, elfcpp::PF_R); | |
3025 | } | |
3026 | } | |
4a657b0d DK |
3027 | } |
3028 | ||
bec53400 DK |
3029 | // Return whether a direct absolute static relocation needs to be applied. |
3030 | // In cases where Scan::local() or Scan::global() has created | |
3031 | // a dynamic relocation other than R_ARM_RELATIVE, the addend | |
3032 | // of the relocation is carried in the data, and we must not | |
3033 | // apply the static relocation. | |
3034 | ||
3035 | template<bool big_endian> | |
3036 | inline bool | |
3037 | Target_arm<big_endian>::Relocate::should_apply_static_reloc( | |
3038 | const Sized_symbol<32>* gsym, | |
3039 | int ref_flags, | |
3040 | bool is_32bit, | |
3041 | Output_section* output_section) | |
3042 | { | |
3043 | // If the output section is not allocated, then we didn't call | |
3044 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
3045 | // the reloc here. | |
3046 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
3047 | return true; | |
3048 | ||
3049 | // For local symbols, we will have created a non-RELATIVE dynamic | |
3050 | // relocation only if (a) the output is position independent, | |
3051 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
3052 | // (c) the relocation is not 32 bits wide. | |
3053 | if (gsym == NULL) | |
3054 | return !(parameters->options().output_is_position_independent() | |
3055 | && (ref_flags & Symbol::ABSOLUTE_REF) | |
3056 | && !is_32bit); | |
3057 | ||
3058 | // For global symbols, we use the same helper routines used in the | |
3059 | // scan pass. If we did not create a dynamic relocation, or if we | |
3060 | // created a RELATIVE dynamic relocation, we should apply the static | |
3061 | // relocation. | |
3062 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
3063 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
3064 | && gsym->can_use_relative_reloc(ref_flags | |
3065 | & Symbol::FUNCTION_CALL); | |
3066 | return !has_dyn || is_rel; | |
3067 | } | |
3068 | ||
4a657b0d DK |
3069 | // Perform a relocation. |
3070 | ||
3071 | template<bool big_endian> | |
3072 | inline bool | |
3073 | Target_arm<big_endian>::Relocate::relocate( | |
c121c671 DK |
3074 | const Relocate_info<32, big_endian>* relinfo, |
3075 | Target_arm* target, | |
3076 | Output_section *output_section, | |
3077 | size_t relnum, | |
3078 | const elfcpp::Rel<32, big_endian>& rel, | |
4a657b0d | 3079 | unsigned int r_type, |
c121c671 DK |
3080 | const Sized_symbol<32>* gsym, |
3081 | const Symbol_value<32>* psymval, | |
3082 | unsigned char* view, | |
3083 | elfcpp::Elf_types<32>::Elf_Addr address, | |
4a657b0d DK |
3084 | section_size_type /* view_size */ ) |
3085 | { | |
c121c671 DK |
3086 | typedef Arm_relocate_functions<big_endian> Arm_relocate_functions; |
3087 | ||
3088 | r_type = get_real_reloc_type(r_type); | |
3089 | ||
3090 | // If this the symbol may be a Thumb function, set thumb bit to 1. | |
3091 | bool has_thumb_bit = ((gsym != NULL) | |
3092 | && (gsym->type() == elfcpp::STT_FUNC | |
3093 | || gsym->type() == elfcpp::STT_ARM_TFUNC)); | |
3094 | ||
3095 | // Pick the value to use for symbols defined in shared objects. | |
3096 | Symbol_value<32> symval; | |
3097 | if (gsym != NULL | |
3098 | && gsym->use_plt_offset(reloc_is_non_pic(r_type))) | |
3099 | { | |
3100 | symval.set_output_value(target->plt_section()->address() | |
3101 | + gsym->plt_offset()); | |
3102 | psymval = &symval; | |
3103 | has_thumb_bit = 0; | |
3104 | } | |
3105 | ||
3106 | const Sized_relobj<32, big_endian>* object = relinfo->object; | |
3107 | ||
3108 | // Get the GOT offset if needed. | |
3109 | // The GOT pointer points to the end of the GOT section. | |
3110 | // We need to subtract the size of the GOT section to get | |
3111 | // the actual offset to use in the relocation. | |
3112 | bool have_got_offset = false; | |
3113 | unsigned int got_offset = 0; | |
3114 | switch (r_type) | |
3115 | { | |
3116 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 3117 | case elfcpp::R_ARM_GOT_PREL: |
c121c671 DK |
3118 | if (gsym != NULL) |
3119 | { | |
3120 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3121 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
3122 | - target->got_size()); | |
3123 | } | |
3124 | else | |
3125 | { | |
3126 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3127 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3128 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3129 | - target->got_size()); | |
3130 | } | |
3131 | have_got_offset = true; | |
3132 | break; | |
3133 | ||
3134 | default: | |
3135 | break; | |
3136 | } | |
3137 | ||
3138 | typename Arm_relocate_functions::Status reloc_status = | |
3139 | Arm_relocate_functions::STATUS_OKAY; | |
4a657b0d DK |
3140 | switch (r_type) |
3141 | { | |
3142 | case elfcpp::R_ARM_NONE: | |
3143 | break; | |
3144 | ||
5e445df6 ILT |
3145 | case elfcpp::R_ARM_ABS8: |
3146 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3147 | output_section)) | |
be8fcb75 ILT |
3148 | reloc_status = Arm_relocate_functions::abs8(view, object, psymval); |
3149 | break; | |
3150 | ||
3151 | case elfcpp::R_ARM_ABS12: | |
3152 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3153 | output_section)) | |
3154 | reloc_status = Arm_relocate_functions::abs12(view, object, psymval); | |
3155 | break; | |
3156 | ||
3157 | case elfcpp::R_ARM_ABS16: | |
3158 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3159 | output_section)) | |
3160 | reloc_status = Arm_relocate_functions::abs16(view, object, psymval); | |
5e445df6 ILT |
3161 | break; |
3162 | ||
c121c671 DK |
3163 | case elfcpp::R_ARM_ABS32: |
3164 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3165 | output_section)) | |
3166 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
3167 | has_thumb_bit); | |
3168 | break; | |
3169 | ||
be8fcb75 ILT |
3170 | case elfcpp::R_ARM_ABS32_NOI: |
3171 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3172 | output_section)) | |
3173 | // No thumb bit for this relocation: (S + A) | |
3174 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
3175 | false); | |
3176 | break; | |
3177 | ||
fd3c5f0b ILT |
3178 | case elfcpp::R_ARM_MOVW_ABS_NC: |
3179 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3180 | output_section)) | |
3181 | reloc_status = Arm_relocate_functions::movw_abs_nc(view, object, | |
3182 | psymval, | |
3183 | has_thumb_bit); | |
3184 | else | |
3185 | gold_error(_("relocation R_ARM_MOVW_ABS_NC cannot be used when making" | |
3186 | "a shared object; recompile with -fPIC")); | |
3187 | break; | |
3188 | ||
3189 | case elfcpp::R_ARM_MOVT_ABS: | |
3190 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3191 | output_section)) | |
3192 | reloc_status = Arm_relocate_functions::movt_abs(view, object, psymval); | |
3193 | else | |
3194 | gold_error(_("relocation R_ARM_MOVT_ABS cannot be used when making" | |
3195 | "a shared object; recompile with -fPIC")); | |
3196 | break; | |
3197 | ||
3198 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
3199 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3200 | output_section)) | |
3201 | reloc_status = Arm_relocate_functions::thm_movw_abs_nc(view, object, | |
3202 | psymval, | |
3203 | has_thumb_bit); | |
3204 | else | |
3205 | gold_error(_("relocation R_ARM_THM_MOVW_ABS_NC cannot be used when" | |
3206 | "making a shared object; recompile with -fPIC")); | |
3207 | break; | |
3208 | ||
3209 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
3210 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3211 | output_section)) | |
3212 | reloc_status = Arm_relocate_functions::thm_movt_abs(view, object, | |
3213 | psymval); | |
3214 | else | |
3215 | gold_error(_("relocation R_ARM_THM_MOVT_ABS cannot be used when" | |
3216 | "making a shared object; recompile with -fPIC")); | |
3217 | break; | |
3218 | ||
c2a122b6 ILT |
3219 | case elfcpp::R_ARM_MOVW_PREL_NC: |
3220 | reloc_status = Arm_relocate_functions::movw_prel_nc(view, object, | |
3221 | psymval, address, | |
3222 | has_thumb_bit); | |
3223 | break; | |
3224 | ||
3225 | case elfcpp::R_ARM_MOVT_PREL: | |
3226 | reloc_status = Arm_relocate_functions::movt_prel(view, object, | |
3227 | psymval, address); | |
3228 | break; | |
3229 | ||
3230 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
3231 | reloc_status = Arm_relocate_functions::thm_movw_prel_nc(view, object, | |
3232 | psymval, address, | |
3233 | has_thumb_bit); | |
3234 | break; | |
3235 | ||
3236 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
3237 | reloc_status = Arm_relocate_functions::thm_movt_prel(view, object, | |
3238 | psymval, address); | |
3239 | break; | |
3240 | ||
c121c671 DK |
3241 | case elfcpp::R_ARM_REL32: |
3242 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
3243 | address, has_thumb_bit); | |
3244 | break; | |
3245 | ||
be8fcb75 ILT |
3246 | case elfcpp::R_ARM_THM_ABS5: |
3247 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3248 | output_section)) | |
3249 | reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval); | |
3250 | break; | |
3251 | ||
c121c671 DK |
3252 | case elfcpp::R_ARM_THM_CALL: |
3253 | reloc_status = Arm_relocate_functions::thm_call(view, object, psymval, | |
3254 | address, has_thumb_bit); | |
3255 | break; | |
3256 | ||
3257 | case elfcpp::R_ARM_GOTOFF32: | |
3258 | { | |
3259 | elfcpp::Elf_types<32>::Elf_Addr got_origin; | |
3260 | got_origin = target->got_plt_section()->address(); | |
3261 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
3262 | got_origin, has_thumb_bit); | |
3263 | } | |
3264 | break; | |
3265 | ||
3266 | case elfcpp::R_ARM_BASE_PREL: | |
3267 | { | |
3268 | uint32_t origin; | |
3269 | // Get the addressing origin of the output segment defining the | |
3270 | // symbol gsym (AAELF 4.6.1.2 Relocation types) | |
3271 | gold_assert(gsym != NULL); | |
3272 | if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
3273 | origin = gsym->output_segment()->vaddr(); | |
3274 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
3275 | origin = gsym->output_data()->address(); | |
3276 | else | |
3277 | { | |
3278 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3279 | _("cannot find origin of R_ARM_BASE_PREL")); | |
3280 | return true; | |
3281 | } | |
3282 | reloc_status = Arm_relocate_functions::base_prel(view, origin, address); | |
3283 | } | |
3284 | break; | |
3285 | ||
be8fcb75 ILT |
3286 | case elfcpp::R_ARM_BASE_ABS: |
3287 | { | |
3288 | if (!should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3289 | output_section)) | |
3290 | break; | |
3291 | ||
3292 | uint32_t origin; | |
3293 | // Get the addressing origin of the output segment defining | |
3294 | // the symbol gsym (AAELF 4.6.1.2 Relocation types). | |
3295 | if (gsym == NULL) | |
3296 | // R_ARM_BASE_ABS with the NULL symbol will give the | |
3297 | // absolute address of the GOT origin (GOT_ORG) (see ARM IHI | |
3298 | // 0044C (AAELF): 4.6.1.8 Proxy generating relocations). | |
3299 | origin = target->got_plt_section()->address(); | |
3300 | else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
3301 | origin = gsym->output_segment()->vaddr(); | |
3302 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
3303 | origin = gsym->output_data()->address(); | |
3304 | else | |
3305 | { | |
3306 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3307 | _("cannot find origin of R_ARM_BASE_ABS")); | |
3308 | return true; | |
3309 | } | |
3310 | ||
3311 | reloc_status = Arm_relocate_functions::base_abs(view, origin); | |
3312 | } | |
3313 | break; | |
3314 | ||
c121c671 DK |
3315 | case elfcpp::R_ARM_GOT_BREL: |
3316 | gold_assert(have_got_offset); | |
3317 | reloc_status = Arm_relocate_functions::got_brel(view, got_offset); | |
3318 | break; | |
3319 | ||
7f5309a5 ILT |
3320 | case elfcpp::R_ARM_GOT_PREL: |
3321 | gold_assert(have_got_offset); | |
3322 | // Get the address origin for GOT PLT, which is allocated right | |
3323 | // after the GOT section, to calculate an absolute address of | |
3324 | // the symbol GOT entry (got_origin + got_offset). | |
3325 | elfcpp::Elf_types<32>::Elf_Addr got_origin; | |
3326 | got_origin = target->got_plt_section()->address(); | |
3327 | reloc_status = Arm_relocate_functions::got_prel(view, | |
3328 | got_origin + got_offset, | |
3329 | address); | |
3330 | break; | |
3331 | ||
c121c671 DK |
3332 | case elfcpp::R_ARM_PLT32: |
3333 | gold_assert(gsym == NULL | |
3334 | || gsym->has_plt_offset() | |
3335 | || gsym->final_value_is_known() | |
3336 | || (gsym->is_defined() | |
3337 | && !gsym->is_from_dynobj() | |
3338 | && !gsym->is_preemptible())); | |
3339 | reloc_status = Arm_relocate_functions::plt32(view, object, psymval, | |
3340 | address, has_thumb_bit); | |
3341 | break; | |
3342 | ||
3343 | case elfcpp::R_ARM_CALL: | |
3344 | reloc_status = Arm_relocate_functions::call(view, object, psymval, | |
3345 | address, has_thumb_bit); | |
3346 | break; | |
3347 | ||
3348 | case elfcpp::R_ARM_JUMP24: | |
3349 | reloc_status = Arm_relocate_functions::jump24(view, object, psymval, | |
3350 | address, has_thumb_bit); | |
3351 | break; | |
3352 | ||
3353 | case elfcpp::R_ARM_PREL31: | |
3354 | reloc_status = Arm_relocate_functions::prel31(view, object, psymval, | |
3355 | address, has_thumb_bit); | |
3356 | break; | |
3357 | ||
3358 | case elfcpp::R_ARM_TARGET1: | |
3359 | // This should have been mapped to another type already. | |
3360 | // Fall through. | |
3361 | case elfcpp::R_ARM_COPY: | |
3362 | case elfcpp::R_ARM_GLOB_DAT: | |
3363 | case elfcpp::R_ARM_JUMP_SLOT: | |
3364 | case elfcpp::R_ARM_RELATIVE: | |
3365 | // These are relocations which should only be seen by the | |
3366 | // dynamic linker, and should never be seen here. | |
3367 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3368 | _("unexpected reloc %u in object file"), | |
3369 | r_type); | |
3370 | break; | |
3371 | ||
3372 | default: | |
3373 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3374 | _("unsupported reloc %u"), | |
3375 | r_type); | |
3376 | break; | |
3377 | } | |
3378 | ||
3379 | // Report any errors. | |
3380 | switch (reloc_status) | |
3381 | { | |
3382 | case Arm_relocate_functions::STATUS_OKAY: | |
3383 | break; | |
3384 | case Arm_relocate_functions::STATUS_OVERFLOW: | |
3385 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3386 | _("relocation overflow in relocation %u"), | |
3387 | r_type); | |
3388 | break; | |
3389 | case Arm_relocate_functions::STATUS_BAD_RELOC: | |
3390 | gold_error_at_location( | |
3391 | relinfo, | |
3392 | relnum, | |
3393 | rel.get_r_offset(), | |
3394 | _("unexpected opcode while processing relocation %u"), | |
3395 | r_type); | |
3396 | break; | |
4a657b0d DK |
3397 | default: |
3398 | gold_unreachable(); | |
3399 | } | |
3400 | ||
3401 | return true; | |
3402 | } | |
3403 | ||
3404 | // Relocate section data. | |
3405 | ||
3406 | template<bool big_endian> | |
3407 | void | |
3408 | Target_arm<big_endian>::relocate_section( | |
3409 | const Relocate_info<32, big_endian>* relinfo, | |
3410 | unsigned int sh_type, | |
3411 | const unsigned char* prelocs, | |
3412 | size_t reloc_count, | |
3413 | Output_section* output_section, | |
3414 | bool needs_special_offset_handling, | |
3415 | unsigned char* view, | |
3416 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
3417 | section_size_type view_size, |
3418 | const Reloc_symbol_changes* reloc_symbol_changes) | |
4a657b0d DK |
3419 | { |
3420 | typedef typename Target_arm<big_endian>::Relocate Arm_relocate; | |
3421 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3422 | ||
3423 | gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL, | |
3424 | Arm_relocate>( | |
3425 | relinfo, | |
3426 | this, | |
3427 | prelocs, | |
3428 | reloc_count, | |
3429 | output_section, | |
3430 | needs_special_offset_handling, | |
3431 | view, | |
3432 | address, | |
364c7fa5 ILT |
3433 | view_size, |
3434 | reloc_symbol_changes); | |
4a657b0d DK |
3435 | } |
3436 | ||
3437 | // Return the size of a relocation while scanning during a relocatable | |
3438 | // link. | |
3439 | ||
3440 | template<bool big_endian> | |
3441 | unsigned int | |
3442 | Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
3443 | unsigned int r_type, | |
3444 | Relobj* object) | |
3445 | { | |
3446 | r_type = get_real_reloc_type(r_type); | |
3447 | switch (r_type) | |
3448 | { | |
3449 | case elfcpp::R_ARM_NONE: | |
3450 | return 0; | |
3451 | ||
5e445df6 ILT |
3452 | case elfcpp::R_ARM_ABS8: |
3453 | return 1; | |
3454 | ||
be8fcb75 ILT |
3455 | case elfcpp::R_ARM_ABS16: |
3456 | case elfcpp::R_ARM_THM_ABS5: | |
3457 | return 2; | |
3458 | ||
4a657b0d | 3459 | case elfcpp::R_ARM_ABS32: |
be8fcb75 ILT |
3460 | case elfcpp::R_ARM_ABS32_NOI: |
3461 | case elfcpp::R_ARM_ABS12: | |
3462 | case elfcpp::R_ARM_BASE_ABS: | |
4a657b0d DK |
3463 | case elfcpp::R_ARM_REL32: |
3464 | case elfcpp::R_ARM_THM_CALL: | |
3465 | case elfcpp::R_ARM_GOTOFF32: | |
3466 | case elfcpp::R_ARM_BASE_PREL: | |
3467 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 3468 | case elfcpp::R_ARM_GOT_PREL: |
4a657b0d DK |
3469 | case elfcpp::R_ARM_PLT32: |
3470 | case elfcpp::R_ARM_CALL: | |
3471 | case elfcpp::R_ARM_JUMP24: | |
3472 | case elfcpp::R_ARM_PREL31: | |
fd3c5f0b ILT |
3473 | case elfcpp::R_ARM_MOVW_ABS_NC: |
3474 | case elfcpp::R_ARM_MOVT_ABS: | |
3475 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
3476 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
3477 | case elfcpp::R_ARM_MOVW_PREL_NC: |
3478 | case elfcpp::R_ARM_MOVT_PREL: | |
3479 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
3480 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
4a657b0d DK |
3481 | return 4; |
3482 | ||
3483 | case elfcpp::R_ARM_TARGET1: | |
3484 | // This should have been mapped to another type already. | |
3485 | // Fall through. | |
3486 | case elfcpp::R_ARM_COPY: | |
3487 | case elfcpp::R_ARM_GLOB_DAT: | |
3488 | case elfcpp::R_ARM_JUMP_SLOT: | |
3489 | case elfcpp::R_ARM_RELATIVE: | |
3490 | // These are relocations which should only be seen by the | |
3491 | // dynamic linker, and should never be seen here. | |
3492 | gold_error(_("%s: unexpected reloc %u in object file"), | |
3493 | object->name().c_str(), r_type); | |
3494 | return 0; | |
3495 | ||
3496 | default: | |
3497 | object->error(_("unsupported reloc %u in object file"), r_type); | |
3498 | return 0; | |
3499 | } | |
3500 | } | |
3501 | ||
3502 | // Scan the relocs during a relocatable link. | |
3503 | ||
3504 | template<bool big_endian> | |
3505 | void | |
3506 | Target_arm<big_endian>::scan_relocatable_relocs( | |
3507 | const General_options& options, | |
3508 | Symbol_table* symtab, | |
3509 | Layout* layout, | |
3510 | Sized_relobj<32, big_endian>* object, | |
3511 | unsigned int data_shndx, | |
3512 | unsigned int sh_type, | |
3513 | const unsigned char* prelocs, | |
3514 | size_t reloc_count, | |
3515 | Output_section* output_section, | |
3516 | bool needs_special_offset_handling, | |
3517 | size_t local_symbol_count, | |
3518 | const unsigned char* plocal_symbols, | |
3519 | Relocatable_relocs* rr) | |
3520 | { | |
3521 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3522 | ||
3523 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
3524 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3525 | ||
3526 | gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL, | |
3527 | Scan_relocatable_relocs>( | |
3528 | options, | |
3529 | symtab, | |
3530 | layout, | |
3531 | object, | |
3532 | data_shndx, | |
3533 | prelocs, | |
3534 | reloc_count, | |
3535 | output_section, | |
3536 | needs_special_offset_handling, | |
3537 | local_symbol_count, | |
3538 | plocal_symbols, | |
3539 | rr); | |
3540 | } | |
3541 | ||
3542 | // Relocate a section during a relocatable link. | |
3543 | ||
3544 | template<bool big_endian> | |
3545 | void | |
3546 | Target_arm<big_endian>::relocate_for_relocatable( | |
3547 | const Relocate_info<32, big_endian>* relinfo, | |
3548 | unsigned int sh_type, | |
3549 | const unsigned char* prelocs, | |
3550 | size_t reloc_count, | |
3551 | Output_section* output_section, | |
3552 | off_t offset_in_output_section, | |
3553 | const Relocatable_relocs* rr, | |
3554 | unsigned char* view, | |
3555 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
3556 | section_size_type view_size, | |
3557 | unsigned char* reloc_view, | |
3558 | section_size_type reloc_view_size) | |
3559 | { | |
3560 | gold_assert(sh_type == elfcpp::SHT_REL); | |
3561 | ||
3562 | gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>( | |
3563 | relinfo, | |
3564 | prelocs, | |
3565 | reloc_count, | |
3566 | output_section, | |
3567 | offset_in_output_section, | |
3568 | rr, | |
3569 | view, | |
3570 | view_address, | |
3571 | view_size, | |
3572 | reloc_view, | |
3573 | reloc_view_size); | |
3574 | } | |
3575 | ||
94cdfcff DK |
3576 | // Return the value to use for a dynamic symbol which requires special |
3577 | // treatment. This is how we support equality comparisons of function | |
3578 | // pointers across shared library boundaries, as described in the | |
3579 | // processor specific ABI supplement. | |
3580 | ||
4a657b0d DK |
3581 | template<bool big_endian> |
3582 | uint64_t | |
94cdfcff | 3583 | Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const |
4a657b0d | 3584 | { |
94cdfcff DK |
3585 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
3586 | return this->plt_section()->address() + gsym->plt_offset(); | |
4a657b0d DK |
3587 | } |
3588 | ||
3589 | // Map platform-specific relocs to real relocs | |
3590 | // | |
3591 | template<bool big_endian> | |
3592 | unsigned int | |
3593 | Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type) | |
3594 | { | |
3595 | switch (r_type) | |
3596 | { | |
3597 | case elfcpp::R_ARM_TARGET1: | |
3598 | // This is either R_ARM_ABS32 or R_ARM_REL32; | |
3599 | return elfcpp::R_ARM_ABS32; | |
3600 | ||
3601 | case elfcpp::R_ARM_TARGET2: | |
3602 | // This can be any reloc type but ususally is R_ARM_GOT_PREL | |
3603 | return elfcpp::R_ARM_GOT_PREL; | |
3604 | ||
3605 | default: | |
3606 | return r_type; | |
3607 | } | |
3608 | } | |
3609 | ||
3610 | // The selector for arm object files. | |
3611 | ||
3612 | template<bool big_endian> | |
3613 | class Target_selector_arm : public Target_selector | |
3614 | { | |
3615 | public: | |
3616 | Target_selector_arm() | |
3617 | : Target_selector(elfcpp::EM_ARM, 32, big_endian, | |
3618 | (big_endian ? "elf32-bigarm" : "elf32-littlearm")) | |
3619 | { } | |
3620 | ||
3621 | Target* | |
3622 | do_instantiate_target() | |
3623 | { return new Target_arm<big_endian>(); } | |
3624 | }; | |
3625 | ||
3626 | Target_selector_arm<false> target_selector_arm; | |
3627 | Target_selector_arm<true> target_selector_armbe; | |
3628 | ||
3629 | } // End anonymous namespace. |