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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> | |
56ee5e00 | 32 | #include <algorithm> |
4a657b0d DK |
33 | |
34 | #include "elfcpp.h" | |
35 | #include "parameters.h" | |
36 | #include "reloc.h" | |
37 | #include "arm.h" | |
38 | #include "object.h" | |
39 | #include "symtab.h" | |
40 | #include "layout.h" | |
41 | #include "output.h" | |
42 | #include "copy-relocs.h" | |
43 | #include "target.h" | |
44 | #include "target-reloc.h" | |
45 | #include "target-select.h" | |
46 | #include "tls.h" | |
47 | #include "defstd.h" | |
f345227a | 48 | #include "gc.h" |
4a657b0d DK |
49 | |
50 | namespace | |
51 | { | |
52 | ||
53 | using namespace gold; | |
54 | ||
94cdfcff DK |
55 | template<bool big_endian> |
56 | class Output_data_plt_arm; | |
57 | ||
56ee5e00 DK |
58 | template<bool big_endian> |
59 | class Stub_table; | |
60 | ||
61 | template<bool big_endian> | |
62 | class Arm_input_section; | |
63 | ||
07f508a2 DK |
64 | template<bool big_endian> |
65 | class Arm_output_section; | |
66 | ||
67 | template<bool big_endian> | |
68 | class Arm_relobj; | |
69 | ||
b569affa DK |
70 | template<bool big_endian> |
71 | class Target_arm; | |
72 | ||
73 | // For convenience. | |
74 | typedef elfcpp::Elf_types<32>::Elf_Addr Arm_address; | |
75 | ||
76 | // Maximum branch offsets for ARM, THUMB and THUMB2. | |
77 | const int32_t ARM_MAX_FWD_BRANCH_OFFSET = ((((1 << 23) - 1) << 2) + 8); | |
78 | const int32_t ARM_MAX_BWD_BRANCH_OFFSET = ((-((1 << 23) << 2)) + 8); | |
79 | const int32_t THM_MAX_FWD_BRANCH_OFFSET = ((1 << 22) -2 + 4); | |
80 | const int32_t THM_MAX_BWD_BRANCH_OFFSET = (-(1 << 22) + 4); | |
81 | const int32_t THM2_MAX_FWD_BRANCH_OFFSET = (((1 << 24) - 2) + 4); | |
82 | const int32_t THM2_MAX_BWD_BRANCH_OFFSET = (-(1 << 24) + 4); | |
83 | ||
4a657b0d DK |
84 | // The arm target class. |
85 | // | |
86 | // This is a very simple port of gold for ARM-EABI. It is intended for | |
87 | // supporting Android only for the time being. Only these relocation types | |
88 | // are supported. | |
89 | // | |
90 | // R_ARM_NONE | |
91 | // R_ARM_ABS32 | |
be8fcb75 ILT |
92 | // R_ARM_ABS32_NOI |
93 | // R_ARM_ABS16 | |
94 | // R_ARM_ABS12 | |
95 | // R_ARM_ABS8 | |
96 | // R_ARM_THM_ABS5 | |
97 | // R_ARM_BASE_ABS | |
4a657b0d DK |
98 | // R_ARM_REL32 |
99 | // R_ARM_THM_CALL | |
100 | // R_ARM_COPY | |
101 | // R_ARM_GLOB_DAT | |
102 | // R_ARM_BASE_PREL | |
103 | // R_ARM_JUMP_SLOT | |
104 | // R_ARM_RELATIVE | |
105 | // R_ARM_GOTOFF32 | |
106 | // R_ARM_GOT_BREL | |
7f5309a5 | 107 | // R_ARM_GOT_PREL |
4a657b0d DK |
108 | // R_ARM_PLT32 |
109 | // R_ARM_CALL | |
110 | // R_ARM_JUMP24 | |
111 | // R_ARM_TARGET1 | |
112 | // R_ARM_PREL31 | |
7f5309a5 | 113 | // R_ARM_ABS8 |
fd3c5f0b ILT |
114 | // R_ARM_MOVW_ABS_NC |
115 | // R_ARM_MOVT_ABS | |
116 | // R_ARM_THM_MOVW_ABS_NC | |
c2a122b6 ILT |
117 | // R_ARM_THM_MOVT_ABS |
118 | // R_ARM_MOVW_PREL_NC | |
119 | // R_ARM_MOVT_PREL | |
120 | // R_ARM_THM_MOVW_PREL_NC | |
121 | // R_ARM_THM_MOVT_PREL | |
4a657b0d | 122 | // |
4a657b0d | 123 | // TODOs: |
11af873f DK |
124 | // - Generate various branch stubs. |
125 | // - Support interworking. | |
126 | // - Define section symbols __exidx_start and __exidx_stop. | |
4a657b0d | 127 | // - Support more relocation types as needed. |
94cdfcff DK |
128 | // - Make PLTs more flexible for different architecture features like |
129 | // Thumb-2 and BE8. | |
11af873f | 130 | // There are probably a lot more. |
4a657b0d | 131 | |
b569affa DK |
132 | // Instruction template class. This class is similar to the insn_sequence |
133 | // struct in bfd/elf32-arm.c. | |
134 | ||
135 | class Insn_template | |
136 | { | |
137 | public: | |
138 | // Types of instruction templates. | |
139 | enum Type | |
140 | { | |
141 | THUMB16_TYPE = 1, | |
142 | THUMB32_TYPE, | |
143 | ARM_TYPE, | |
144 | DATA_TYPE | |
145 | }; | |
146 | ||
147 | // Factory methods to create instrunction templates in different formats. | |
148 | ||
149 | static const Insn_template | |
150 | thumb16_insn(uint32_t data) | |
151 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 0); } | |
152 | ||
153 | // A bit of a hack. A Thumb conditional branch, in which the proper | |
154 | // condition is inserted when we build the stub. | |
155 | static const Insn_template | |
156 | thumb16_bcond_insn(uint32_t data) | |
157 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 1); } | |
158 | ||
159 | static const Insn_template | |
160 | thumb32_insn(uint32_t data) | |
161 | { return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_NONE, 0); } | |
162 | ||
163 | static const Insn_template | |
164 | thumb32_b_insn(uint32_t data, int reloc_addend) | |
165 | { | |
166 | return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_THM_JUMP24, | |
167 | reloc_addend); | |
168 | } | |
169 | ||
170 | static const Insn_template | |
171 | arm_insn(uint32_t data) | |
172 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_NONE, 0); } | |
173 | ||
174 | static const Insn_template | |
175 | arm_rel_insn(unsigned data, int reloc_addend) | |
176 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_JUMP24, reloc_addend); } | |
177 | ||
178 | static const Insn_template | |
179 | data_word(unsigned data, unsigned int r_type, int reloc_addend) | |
180 | { return Insn_template(data, DATA_TYPE, r_type, reloc_addend); } | |
181 | ||
182 | // Accessors. This class is used for read-only objects so no modifiers | |
183 | // are provided. | |
184 | ||
185 | uint32_t | |
186 | data() const | |
187 | { return this->data_; } | |
188 | ||
189 | // Return the instruction sequence type of this. | |
190 | Type | |
191 | type() const | |
192 | { return this->type_; } | |
193 | ||
194 | // Return the ARM relocation type of this. | |
195 | unsigned int | |
196 | r_type() const | |
197 | { return this->r_type_; } | |
198 | ||
199 | int32_t | |
200 | reloc_addend() const | |
201 | { return this->reloc_addend_; } | |
202 | ||
203 | // Return size of instrunction template in bytes. | |
204 | size_t | |
205 | size() const; | |
206 | ||
207 | // Return byte-alignment of instrunction template. | |
208 | unsigned | |
209 | alignment() const; | |
210 | ||
211 | private: | |
212 | // We make the constructor private to ensure that only the factory | |
213 | // methods are used. | |
214 | inline | |
215 | Insn_template(unsigned data, Type type, unsigned int r_type, int reloc_addend) | |
216 | : data_(data), type_(type), r_type_(r_type), reloc_addend_(reloc_addend) | |
217 | { } | |
218 | ||
219 | // Instruction specific data. This is used to store information like | |
220 | // some of the instruction bits. | |
221 | uint32_t data_; | |
222 | // Instruction template type. | |
223 | Type type_; | |
224 | // Relocation type if there is a relocation or R_ARM_NONE otherwise. | |
225 | unsigned int r_type_; | |
226 | // Relocation addend. | |
227 | int32_t reloc_addend_; | |
228 | }; | |
229 | ||
230 | // Macro for generating code to stub types. One entry per long/short | |
231 | // branch stub | |
232 | ||
233 | #define DEF_STUBS \ | |
234 | DEF_STUB(long_branch_any_any) \ | |
235 | DEF_STUB(long_branch_v4t_arm_thumb) \ | |
236 | DEF_STUB(long_branch_thumb_only) \ | |
237 | DEF_STUB(long_branch_v4t_thumb_thumb) \ | |
238 | DEF_STUB(long_branch_v4t_thumb_arm) \ | |
239 | DEF_STUB(short_branch_v4t_thumb_arm) \ | |
240 | DEF_STUB(long_branch_any_arm_pic) \ | |
241 | DEF_STUB(long_branch_any_thumb_pic) \ | |
242 | DEF_STUB(long_branch_v4t_thumb_thumb_pic) \ | |
243 | DEF_STUB(long_branch_v4t_arm_thumb_pic) \ | |
244 | DEF_STUB(long_branch_v4t_thumb_arm_pic) \ | |
245 | DEF_STUB(long_branch_thumb_only_pic) \ | |
246 | DEF_STUB(a8_veneer_b_cond) \ | |
247 | DEF_STUB(a8_veneer_b) \ | |
248 | DEF_STUB(a8_veneer_bl) \ | |
249 | DEF_STUB(a8_veneer_blx) | |
250 | ||
251 | // Stub types. | |
252 | ||
253 | #define DEF_STUB(x) arm_stub_##x, | |
254 | typedef enum | |
255 | { | |
256 | arm_stub_none, | |
257 | DEF_STUBS | |
258 | ||
259 | // First reloc stub type. | |
260 | arm_stub_reloc_first = arm_stub_long_branch_any_any, | |
261 | // Last reloc stub type. | |
262 | arm_stub_reloc_last = arm_stub_long_branch_thumb_only_pic, | |
263 | ||
264 | // First Cortex-A8 stub type. | |
265 | arm_stub_cortex_a8_first = arm_stub_a8_veneer_b_cond, | |
266 | // Last Cortex-A8 stub type. | |
267 | arm_stub_cortex_a8_last = arm_stub_a8_veneer_blx, | |
268 | ||
269 | // Last stub type. | |
270 | arm_stub_type_last = arm_stub_a8_veneer_blx | |
271 | } Stub_type; | |
272 | #undef DEF_STUB | |
273 | ||
274 | // Stub template class. Templates are meant to be read-only objects. | |
275 | // A stub template for a stub type contains all read-only attributes | |
276 | // common to all stubs of the same type. | |
277 | ||
278 | class Stub_template | |
279 | { | |
280 | public: | |
281 | Stub_template(Stub_type, const Insn_template*, size_t); | |
282 | ||
283 | ~Stub_template() | |
284 | { } | |
285 | ||
286 | // Return stub type. | |
287 | Stub_type | |
288 | type() const | |
289 | { return this->type_; } | |
290 | ||
291 | // Return an array of instruction templates. | |
292 | const Insn_template* | |
293 | insns() const | |
294 | { return this->insns_; } | |
295 | ||
296 | // Return size of template in number of instructions. | |
297 | size_t | |
298 | insn_count() const | |
299 | { return this->insn_count_; } | |
300 | ||
301 | // Return size of template in bytes. | |
302 | size_t | |
303 | size() const | |
304 | { return this->size_; } | |
305 | ||
306 | // Return alignment of the stub template. | |
307 | unsigned | |
308 | alignment() const | |
309 | { return this->alignment_; } | |
310 | ||
311 | // Return whether entry point is in thumb mode. | |
312 | bool | |
313 | entry_in_thumb_mode() const | |
314 | { return this->entry_in_thumb_mode_; } | |
315 | ||
316 | // Return number of relocations in this template. | |
317 | size_t | |
318 | reloc_count() const | |
319 | { return this->relocs_.size(); } | |
320 | ||
321 | // Return index of the I-th instruction with relocation. | |
322 | size_t | |
323 | reloc_insn_index(size_t i) const | |
324 | { | |
325 | gold_assert(i < this->relocs_.size()); | |
326 | return this->relocs_[i].first; | |
327 | } | |
328 | ||
329 | // Return the offset of the I-th instruction with relocation from the | |
330 | // beginning of the stub. | |
331 | section_size_type | |
332 | reloc_offset(size_t i) const | |
333 | { | |
334 | gold_assert(i < this->relocs_.size()); | |
335 | return this->relocs_[i].second; | |
336 | } | |
337 | ||
338 | private: | |
339 | // This contains information about an instruction template with a relocation | |
340 | // and its offset from start of stub. | |
341 | typedef std::pair<size_t, section_size_type> Reloc; | |
342 | ||
343 | // A Stub_template may not be copied. We want to share templates as much | |
344 | // as possible. | |
345 | Stub_template(const Stub_template&); | |
346 | Stub_template& operator=(const Stub_template&); | |
347 | ||
348 | // Stub type. | |
349 | Stub_type type_; | |
350 | // Points to an array of Insn_templates. | |
351 | const Insn_template* insns_; | |
352 | // Number of Insn_templates in insns_[]. | |
353 | size_t insn_count_; | |
354 | // Size of templated instructions in bytes. | |
355 | size_t size_; | |
356 | // Alignment of templated instructions. | |
357 | unsigned alignment_; | |
358 | // Flag to indicate if entry is in thumb mode. | |
359 | bool entry_in_thumb_mode_; | |
360 | // A table of reloc instruction indices and offsets. We can find these by | |
361 | // looking at the instruction templates but we pre-compute and then stash | |
362 | // them here for speed. | |
363 | std::vector<Reloc> relocs_; | |
364 | }; | |
365 | ||
366 | // | |
367 | // A class for code stubs. This is a base class for different type of | |
368 | // stubs used in the ARM target. | |
369 | // | |
370 | ||
371 | class Stub | |
372 | { | |
373 | private: | |
374 | static const section_offset_type invalid_offset = | |
375 | static_cast<section_offset_type>(-1); | |
376 | ||
377 | public: | |
378 | Stub(const Stub_template* stub_template) | |
379 | : stub_template_(stub_template), offset_(invalid_offset) | |
380 | { } | |
381 | ||
382 | virtual | |
383 | ~Stub() | |
384 | { } | |
385 | ||
386 | // Return the stub template. | |
387 | const Stub_template* | |
388 | stub_template() const | |
389 | { return this->stub_template_; } | |
390 | ||
391 | // Return offset of code stub from beginning of its containing stub table. | |
392 | section_offset_type | |
393 | offset() const | |
394 | { | |
395 | gold_assert(this->offset_ != invalid_offset); | |
396 | return this->offset_; | |
397 | } | |
398 | ||
399 | // Set offset of code stub from beginning of its containing stub table. | |
400 | void | |
401 | set_offset(section_offset_type offset) | |
402 | { this->offset_ = offset; } | |
403 | ||
404 | // Return the relocation target address of the i-th relocation in the | |
405 | // stub. This must be defined in a child class. | |
406 | Arm_address | |
407 | reloc_target(size_t i) | |
408 | { return this->do_reloc_target(i); } | |
409 | ||
410 | // Write a stub at output VIEW. BIG_ENDIAN select how a stub is written. | |
411 | void | |
412 | write(unsigned char* view, section_size_type view_size, bool big_endian) | |
413 | { this->do_write(view, view_size, big_endian); } | |
414 | ||
415 | protected: | |
416 | // This must be defined in the child class. | |
417 | virtual Arm_address | |
418 | do_reloc_target(size_t) = 0; | |
419 | ||
420 | // This must be defined in the child class. | |
421 | virtual void | |
422 | do_write(unsigned char*, section_size_type, bool) = 0; | |
423 | ||
424 | private: | |
425 | // Its template. | |
426 | const Stub_template* stub_template_; | |
427 | // Offset within the section of containing this stub. | |
428 | section_offset_type offset_; | |
429 | }; | |
430 | ||
431 | // Reloc stub class. These are stubs we use to fix up relocation because | |
432 | // of limited branch ranges. | |
433 | ||
434 | class Reloc_stub : public Stub | |
435 | { | |
436 | public: | |
437 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); | |
438 | // We assume we never jump to this address. | |
439 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
440 | ||
441 | // Return destination address. | |
442 | Arm_address | |
443 | destination_address() const | |
444 | { | |
445 | gold_assert(this->destination_address_ != this->invalid_address); | |
446 | return this->destination_address_; | |
447 | } | |
448 | ||
449 | // Set destination address. | |
450 | void | |
451 | set_destination_address(Arm_address address) | |
452 | { | |
453 | gold_assert(address != this->invalid_address); | |
454 | this->destination_address_ = address; | |
455 | } | |
456 | ||
457 | // Reset destination address. | |
458 | void | |
459 | reset_destination_address() | |
460 | { this->destination_address_ = this->invalid_address; } | |
461 | ||
462 | // Determine stub type for a branch of a relocation of R_TYPE going | |
463 | // from BRANCH_ADDRESS to BRANCH_TARGET. If TARGET_IS_THUMB is set, | |
464 | // the branch target is a thumb instruction. TARGET is used for look | |
465 | // up ARM-specific linker settings. | |
466 | static Stub_type | |
467 | stub_type_for_reloc(unsigned int r_type, Arm_address branch_address, | |
468 | Arm_address branch_target, bool target_is_thumb); | |
469 | ||
470 | // Reloc_stub key. A key is logically a triplet of a stub type, a symbol | |
471 | // and an addend. Since we treat global and local symbol differently, we | |
472 | // use a Symbol object for a global symbol and a object-index pair for | |
473 | // a local symbol. | |
474 | class Key | |
475 | { | |
476 | public: | |
477 | // If SYMBOL is not null, this is a global symbol, we ignore RELOBJ and | |
478 | // R_SYM. Otherwise, this is a local symbol and RELOBJ must non-NULL | |
479 | // and R_SYM must not be invalid_index. | |
480 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, | |
481 | unsigned int r_sym, int32_t addend) | |
482 | : stub_type_(stub_type), addend_(addend) | |
483 | { | |
484 | if (symbol != NULL) | |
485 | { | |
486 | this->r_sym_ = Reloc_stub::invalid_index; | |
487 | this->u_.symbol = symbol; | |
488 | } | |
489 | else | |
490 | { | |
491 | gold_assert(relobj != NULL && r_sym != invalid_index); | |
492 | this->r_sym_ = r_sym; | |
493 | this->u_.relobj = relobj; | |
494 | } | |
495 | } | |
496 | ||
497 | ~Key() | |
498 | { } | |
499 | ||
500 | // Accessors: Keys are meant to be read-only object so no modifiers are | |
501 | // provided. | |
502 | ||
503 | // Return stub type. | |
504 | Stub_type | |
505 | stub_type() const | |
506 | { return this->stub_type_; } | |
507 | ||
508 | // Return the local symbol index or invalid_index. | |
509 | unsigned int | |
510 | r_sym() const | |
511 | { return this->r_sym_; } | |
512 | ||
513 | // Return the symbol if there is one. | |
514 | const Symbol* | |
515 | symbol() const | |
516 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
517 | ||
518 | // Return the relobj if there is one. | |
519 | const Relobj* | |
520 | relobj() const | |
521 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
522 | ||
523 | // Whether this equals to another key k. | |
524 | bool | |
525 | eq(const Key& k) const | |
526 | { | |
527 | return ((this->stub_type_ == k.stub_type_) | |
528 | && (this->r_sym_ == k.r_sym_) | |
529 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
530 | ? (this->u_.relobj == k.u_.relobj) | |
531 | : (this->u_.symbol == k.u_.symbol)) | |
532 | && (this->addend_ == k.addend_)); | |
533 | } | |
534 | ||
535 | // Return a hash value. | |
536 | size_t | |
537 | hash_value() const | |
538 | { | |
539 | return (this->stub_type_ | |
540 | ^ this->r_sym_ | |
541 | ^ gold::string_hash<char>( | |
542 | (this->r_sym_ != Reloc_stub::invalid_index) | |
543 | ? this->u_.relobj->name().c_str() | |
544 | : this->u_.symbol->name()) | |
545 | ^ this->addend_); | |
546 | } | |
547 | ||
548 | // Functors for STL associative containers. | |
549 | struct hash | |
550 | { | |
551 | size_t | |
552 | operator()(const Key& k) const | |
553 | { return k.hash_value(); } | |
554 | }; | |
555 | ||
556 | struct equal_to | |
557 | { | |
558 | bool | |
559 | operator()(const Key& k1, const Key& k2) const | |
560 | { return k1.eq(k2); } | |
561 | }; | |
562 | ||
563 | // Name of key. This is mainly for debugging. | |
564 | std::string | |
565 | name() const; | |
566 | ||
567 | private: | |
568 | // Stub type. | |
569 | Stub_type stub_type_; | |
570 | // If this is a local symbol, this is the index in the defining object. | |
571 | // Otherwise, it is invalid_index for a global symbol. | |
572 | unsigned int r_sym_; | |
573 | // If r_sym_ is invalid index. This points to a global symbol. | |
574 | // Otherwise, this points a relobj. We used the unsized and target | |
575 | // independent Symbol and Relobj classes instead of Arm_symbol and | |
576 | // Arm_relobj. This is done to avoid making the stub class a template | |
577 | // as most of the stub machinery is endianity-neutral. However, it | |
578 | // may require a bit of casting done by users of this class. | |
579 | union | |
580 | { | |
581 | const Symbol* symbol; | |
582 | const Relobj* relobj; | |
583 | } u_; | |
584 | // Addend associated with a reloc. | |
585 | int32_t addend_; | |
586 | }; | |
587 | ||
588 | protected: | |
589 | // Reloc_stubs are created via a stub factory. So these are protected. | |
590 | Reloc_stub(const Stub_template* stub_template) | |
591 | : Stub(stub_template), destination_address_(invalid_address) | |
592 | { } | |
593 | ||
594 | ~Reloc_stub() | |
595 | { } | |
596 | ||
597 | friend class Stub_factory; | |
598 | ||
599 | private: | |
600 | // Return the relocation target address of the i-th relocation in the | |
601 | // stub. | |
602 | Arm_address | |
603 | do_reloc_target(size_t i) | |
604 | { | |
605 | // All reloc stub have only one relocation. | |
606 | gold_assert(i == 0); | |
607 | return this->destination_address_; | |
608 | } | |
609 | ||
610 | // A template to implement do_write below. | |
611 | template<bool big_endian> | |
612 | void inline | |
613 | do_fixed_endian_write(unsigned char*, section_size_type); | |
614 | ||
615 | // Write a stub. | |
616 | void | |
617 | do_write(unsigned char* view, section_size_type view_size, bool big_endian); | |
618 | ||
619 | // Address of destination. | |
620 | Arm_address destination_address_; | |
621 | }; | |
622 | ||
623 | // Stub factory class. | |
624 | ||
625 | class Stub_factory | |
626 | { | |
627 | public: | |
628 | // Return the unique instance of this class. | |
629 | static const Stub_factory& | |
630 | get_instance() | |
631 | { | |
632 | static Stub_factory singleton; | |
633 | return singleton; | |
634 | } | |
635 | ||
636 | // Make a relocation stub. | |
637 | Reloc_stub* | |
638 | make_reloc_stub(Stub_type stub_type) const | |
639 | { | |
640 | gold_assert(stub_type >= arm_stub_reloc_first | |
641 | && stub_type <= arm_stub_reloc_last); | |
642 | return new Reloc_stub(this->stub_templates_[stub_type]); | |
643 | } | |
644 | ||
645 | private: | |
646 | // Constructor and destructor are protected since we only return a single | |
647 | // instance created in Stub_factory::get_instance(). | |
648 | ||
649 | Stub_factory(); | |
650 | ||
651 | // A Stub_factory may not be copied since it is a singleton. | |
652 | Stub_factory(const Stub_factory&); | |
653 | Stub_factory& operator=(Stub_factory&); | |
654 | ||
655 | // Stub templates. These are initialized in the constructor. | |
656 | const Stub_template* stub_templates_[arm_stub_type_last+1]; | |
657 | }; | |
658 | ||
56ee5e00 DK |
659 | // A class to hold stubs for the ARM target. |
660 | ||
661 | template<bool big_endian> | |
662 | class Stub_table : public Output_data | |
663 | { | |
664 | public: | |
665 | Stub_table(Arm_input_section<big_endian>* owner) | |
666 | : Output_data(), addralign_(1), owner_(owner), has_been_changed_(false), | |
667 | reloc_stubs_() | |
668 | { } | |
669 | ||
670 | ~Stub_table() | |
671 | { } | |
672 | ||
673 | // Owner of this stub table. | |
674 | Arm_input_section<big_endian>* | |
675 | owner() const | |
676 | { return this->owner_; } | |
677 | ||
678 | // Whether this stub table is empty. | |
679 | bool | |
680 | empty() const | |
681 | { return this->reloc_stubs_.empty(); } | |
682 | ||
683 | // Whether this has been changed. | |
684 | bool | |
685 | has_been_changed() const | |
686 | { return this->has_been_changed_; } | |
687 | ||
688 | // Set the has-been-changed flag. | |
689 | void | |
690 | set_has_been_changed(bool value) | |
691 | { this->has_been_changed_ = value; } | |
692 | ||
693 | // Return the current data size. | |
694 | off_t | |
695 | current_data_size() const | |
696 | { return this->current_data_size_for_child(); } | |
697 | ||
698 | // Add a STUB with using KEY. Caller is reponsible for avoid adding | |
699 | // if already a STUB with the same key has been added. | |
700 | void | |
701 | add_reloc_stub(Reloc_stub* stub, const Reloc_stub::Key& key); | |
702 | ||
703 | // Look up a relocation stub using KEY. Return NULL if there is none. | |
704 | Reloc_stub* | |
705 | find_reloc_stub(const Reloc_stub::Key& key) const | |
706 | { | |
707 | typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.find(key); | |
708 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; | |
709 | } | |
710 | ||
711 | // Relocate stubs in this stub table. | |
712 | void | |
713 | relocate_stubs(const Relocate_info<32, big_endian>*, | |
714 | Target_arm<big_endian>*, Output_section*, | |
715 | unsigned char*, Arm_address, section_size_type); | |
716 | ||
717 | protected: | |
718 | // Write out section contents. | |
719 | void | |
720 | do_write(Output_file*); | |
721 | ||
722 | // Return the required alignment. | |
723 | uint64_t | |
724 | do_addralign() const | |
725 | { return this->addralign_; } | |
726 | ||
727 | // Finalize data size. | |
728 | void | |
729 | set_final_data_size() | |
730 | { this->set_data_size(this->current_data_size_for_child()); } | |
731 | ||
732 | // Reset address and file offset. | |
733 | void | |
734 | do_reset_address_and_file_offset(); | |
735 | ||
736 | private: | |
737 | // Unordered map of stubs. | |
738 | typedef | |
739 | Unordered_map<Reloc_stub::Key, Reloc_stub*, Reloc_stub::Key::hash, | |
740 | Reloc_stub::Key::equal_to> | |
741 | Reloc_stub_map; | |
742 | ||
743 | // Address alignment | |
744 | uint64_t addralign_; | |
745 | // Owner of this stub table. | |
746 | Arm_input_section<big_endian>* owner_; | |
747 | // This is set to true during relaxiong if the size of the stub table | |
748 | // has been changed. | |
749 | bool has_been_changed_; | |
750 | // The relocation stubs. | |
751 | Reloc_stub_map reloc_stubs_; | |
752 | }; | |
753 | ||
10ad9fe5 DK |
754 | // A class to wrap an ordinary input section containing executable code. |
755 | ||
756 | template<bool big_endian> | |
757 | class Arm_input_section : public Output_relaxed_input_section | |
758 | { | |
759 | public: | |
760 | Arm_input_section(Relobj* relobj, unsigned int shndx) | |
761 | : Output_relaxed_input_section(relobj, shndx, 1), | |
762 | original_addralign_(1), original_size_(0), stub_table_(NULL) | |
763 | { } | |
764 | ||
765 | ~Arm_input_section() | |
766 | { } | |
767 | ||
768 | // Initialize. | |
769 | void | |
770 | init(); | |
771 | ||
772 | // Whether this is a stub table owner. | |
773 | bool | |
774 | is_stub_table_owner() const | |
775 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } | |
776 | ||
777 | // Return the stub table. | |
778 | Stub_table<big_endian>* | |
779 | stub_table() const | |
780 | { return this->stub_table_; } | |
781 | ||
782 | // Set the stub_table. | |
783 | void | |
784 | set_stub_table(Stub_table<big_endian>* stub_table) | |
785 | { this->stub_table_ = stub_table; } | |
786 | ||
07f508a2 DK |
787 | // Downcast a base pointer to an Arm_input_section pointer. This is |
788 | // not type-safe but we only use Arm_input_section not the base class. | |
789 | static Arm_input_section<big_endian>* | |
790 | as_arm_input_section(Output_relaxed_input_section* poris) | |
791 | { return static_cast<Arm_input_section<big_endian>*>(poris); } | |
792 | ||
10ad9fe5 DK |
793 | protected: |
794 | // Write data to output file. | |
795 | void | |
796 | do_write(Output_file*); | |
797 | ||
798 | // Return required alignment of this. | |
799 | uint64_t | |
800 | do_addralign() const | |
801 | { | |
802 | if (this->is_stub_table_owner()) | |
803 | return std::max(this->stub_table_->addralign(), | |
804 | this->original_addralign_); | |
805 | else | |
806 | return this->original_addralign_; | |
807 | } | |
808 | ||
809 | // Finalize data size. | |
810 | void | |
811 | set_final_data_size(); | |
812 | ||
813 | // Reset address and file offset. | |
814 | void | |
815 | do_reset_address_and_file_offset(); | |
816 | ||
817 | // Output offset. | |
818 | bool | |
819 | do_output_offset(const Relobj* object, unsigned int shndx, | |
820 | section_offset_type offset, | |
821 | section_offset_type* poutput) const | |
822 | { | |
823 | if ((object == this->relobj()) | |
824 | && (shndx == this->shndx()) | |
825 | && (offset >= 0) | |
826 | && (convert_types<uint64_t, section_offset_type>(offset) | |
827 | <= this->original_size_)) | |
828 | { | |
829 | *poutput = offset; | |
830 | return true; | |
831 | } | |
832 | else | |
833 | return false; | |
834 | } | |
835 | ||
836 | private: | |
837 | // Copying is not allowed. | |
838 | Arm_input_section(const Arm_input_section&); | |
839 | Arm_input_section& operator=(const Arm_input_section&); | |
840 | ||
841 | // Address alignment of the original input section. | |
842 | uint64_t original_addralign_; | |
843 | // Section size of the original input section. | |
844 | uint64_t original_size_; | |
845 | // Stub table. | |
846 | Stub_table<big_endian>* stub_table_; | |
847 | }; | |
848 | ||
07f508a2 DK |
849 | // Arm output section class. This is defined mainly to add a number of |
850 | // stub generation methods. | |
851 | ||
852 | template<bool big_endian> | |
853 | class Arm_output_section : public Output_section | |
854 | { | |
855 | public: | |
856 | Arm_output_section(const char* name, elfcpp::Elf_Word type, | |
857 | elfcpp::Elf_Xword flags) | |
858 | : Output_section(name, type, flags) | |
859 | { } | |
860 | ||
861 | ~Arm_output_section() | |
862 | { } | |
863 | ||
864 | // Group input sections for stub generation. | |
865 | void | |
866 | group_sections(section_size_type, bool, Target_arm<big_endian>*); | |
867 | ||
868 | // Downcast a base pointer to an Arm_output_section pointer. This is | |
869 | // not type-safe but we only use Arm_output_section not the base class. | |
870 | static Arm_output_section<big_endian>* | |
871 | as_arm_output_section(Output_section* os) | |
872 | { return static_cast<Arm_output_section<big_endian>*>(os); } | |
873 | ||
874 | private: | |
875 | // For convenience. | |
876 | typedef Output_section::Input_section Input_section; | |
877 | typedef Output_section::Input_section_list Input_section_list; | |
878 | ||
879 | // Create a stub group. | |
880 | void create_stub_group(Input_section_list::const_iterator, | |
881 | Input_section_list::const_iterator, | |
882 | Input_section_list::const_iterator, | |
883 | Target_arm<big_endian>*, | |
884 | std::vector<Output_relaxed_input_section*>*); | |
885 | }; | |
886 | ||
c121c671 DK |
887 | // Utilities for manipulating integers of up to 32-bits |
888 | ||
889 | namespace utils | |
890 | { | |
891 | // Sign extend an n-bit unsigned integer stored in an uint32_t into | |
892 | // an int32_t. NO_BITS must be between 1 to 32. | |
893 | template<int no_bits> | |
894 | static inline int32_t | |
895 | sign_extend(uint32_t bits) | |
896 | { | |
96d49306 | 897 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
898 | if (no_bits == 32) |
899 | return static_cast<int32_t>(bits); | |
900 | uint32_t mask = (~((uint32_t) 0)) >> (32 - no_bits); | |
901 | bits &= mask; | |
902 | uint32_t top_bit = 1U << (no_bits - 1); | |
903 | int32_t as_signed = static_cast<int32_t>(bits); | |
904 | return (bits & top_bit) ? as_signed + (-top_bit * 2) : as_signed; | |
905 | } | |
906 | ||
907 | // Detects overflow of an NO_BITS integer stored in a uint32_t. | |
908 | template<int no_bits> | |
909 | static inline bool | |
910 | has_overflow(uint32_t bits) | |
911 | { | |
96d49306 | 912 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
913 | if (no_bits == 32) |
914 | return false; | |
915 | int32_t max = (1 << (no_bits - 1)) - 1; | |
916 | int32_t min = -(1 << (no_bits - 1)); | |
917 | int32_t as_signed = static_cast<int32_t>(bits); | |
918 | return as_signed > max || as_signed < min; | |
919 | } | |
920 | ||
5e445df6 ILT |
921 | // Detects overflow of an NO_BITS integer stored in a uint32_t when it |
922 | // fits in the given number of bits as either a signed or unsigned value. | |
923 | // For example, has_signed_unsigned_overflow<8> would check | |
924 | // -128 <= bits <= 255 | |
925 | template<int no_bits> | |
926 | static inline bool | |
927 | has_signed_unsigned_overflow(uint32_t bits) | |
928 | { | |
929 | gold_assert(no_bits >= 2 && no_bits <= 32); | |
930 | if (no_bits == 32) | |
931 | return false; | |
932 | int32_t max = static_cast<int32_t>((1U << no_bits) - 1); | |
933 | int32_t min = -(1 << (no_bits - 1)); | |
934 | int32_t as_signed = static_cast<int32_t>(bits); | |
935 | return as_signed > max || as_signed < min; | |
936 | } | |
937 | ||
c121c671 DK |
938 | // Select bits from A and B using bits in MASK. For each n in [0..31], |
939 | // the n-th bit in the result is chosen from the n-th bits of A and B. | |
940 | // A zero selects A and a one selects B. | |
941 | static inline uint32_t | |
942 | bit_select(uint32_t a, uint32_t b, uint32_t mask) | |
943 | { return (a & ~mask) | (b & mask); } | |
944 | }; | |
945 | ||
4a657b0d DK |
946 | template<bool big_endian> |
947 | class Target_arm : public Sized_target<32, big_endian> | |
948 | { | |
949 | public: | |
950 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
951 | Reloc_section; | |
952 | ||
953 | Target_arm() | |
94cdfcff DK |
954 | : Sized_target<32, big_endian>(&arm_info), |
955 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), | |
b569affa DK |
956 | copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL), |
957 | may_use_blx_(true), should_force_pic_veneer_(false) | |
4a657b0d DK |
958 | { } |
959 | ||
b569affa DK |
960 | // Whether we can use BLX. |
961 | bool | |
962 | may_use_blx() const | |
963 | { return this->may_use_blx_; } | |
964 | ||
965 | // Set use-BLX flag. | |
966 | void | |
967 | set_may_use_blx(bool value) | |
968 | { this->may_use_blx_ = value; } | |
969 | ||
970 | // Whether we force PCI branch veneers. | |
971 | bool | |
972 | should_force_pic_veneer() const | |
973 | { return this->should_force_pic_veneer_; } | |
974 | ||
975 | // Set PIC veneer flag. | |
976 | void | |
977 | set_should_force_pic_veneer(bool value) | |
978 | { this->should_force_pic_veneer_ = value; } | |
979 | ||
980 | // Whether we use THUMB-2 instructions. | |
981 | bool | |
982 | using_thumb2() const | |
983 | { | |
984 | // FIXME: This should not hard-coded. | |
985 | return false; | |
986 | } | |
987 | ||
988 | // Whether we use THUMB/THUMB-2 instructions only. | |
989 | bool | |
990 | using_thumb_only() const | |
991 | { | |
992 | // FIXME: This should not hard-coded. | |
993 | return false; | |
994 | } | |
995 | ||
4a657b0d DK |
996 | // Process the relocations to determine unreferenced sections for |
997 | // garbage collection. | |
998 | void | |
999 | gc_process_relocs(const General_options& options, | |
1000 | Symbol_table* symtab, | |
1001 | Layout* layout, | |
1002 | Sized_relobj<32, big_endian>* object, | |
1003 | unsigned int data_shndx, | |
1004 | unsigned int sh_type, | |
1005 | const unsigned char* prelocs, | |
1006 | size_t reloc_count, | |
1007 | Output_section* output_section, | |
1008 | bool needs_special_offset_handling, | |
1009 | size_t local_symbol_count, | |
1010 | const unsigned char* plocal_symbols); | |
1011 | ||
1012 | // Scan the relocations to look for symbol adjustments. | |
1013 | void | |
1014 | scan_relocs(const General_options& options, | |
1015 | Symbol_table* symtab, | |
1016 | Layout* layout, | |
1017 | Sized_relobj<32, big_endian>* object, | |
1018 | unsigned int data_shndx, | |
1019 | unsigned int sh_type, | |
1020 | const unsigned char* prelocs, | |
1021 | size_t reloc_count, | |
1022 | Output_section* output_section, | |
1023 | bool needs_special_offset_handling, | |
1024 | size_t local_symbol_count, | |
1025 | const unsigned char* plocal_symbols); | |
1026 | ||
1027 | // Finalize the sections. | |
1028 | void | |
1029 | do_finalize_sections(Layout*); | |
1030 | ||
94cdfcff | 1031 | // Return the value to use for a dynamic symbol which requires special |
4a657b0d DK |
1032 | // treatment. |
1033 | uint64_t | |
1034 | do_dynsym_value(const Symbol*) const; | |
1035 | ||
1036 | // Relocate a section. | |
1037 | void | |
1038 | relocate_section(const Relocate_info<32, big_endian>*, | |
1039 | unsigned int sh_type, | |
1040 | const unsigned char* prelocs, | |
1041 | size_t reloc_count, | |
1042 | Output_section* output_section, | |
1043 | bool needs_special_offset_handling, | |
1044 | unsigned char* view, | |
1045 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
364c7fa5 ILT |
1046 | section_size_type view_size, |
1047 | const Reloc_symbol_changes*); | |
4a657b0d DK |
1048 | |
1049 | // Scan the relocs during a relocatable link. | |
1050 | void | |
1051 | scan_relocatable_relocs(const General_options& options, | |
1052 | Symbol_table* symtab, | |
1053 | Layout* layout, | |
1054 | Sized_relobj<32, big_endian>* object, | |
1055 | unsigned int data_shndx, | |
1056 | unsigned int sh_type, | |
1057 | const unsigned char* prelocs, | |
1058 | size_t reloc_count, | |
1059 | Output_section* output_section, | |
1060 | bool needs_special_offset_handling, | |
1061 | size_t local_symbol_count, | |
1062 | const unsigned char* plocal_symbols, | |
1063 | Relocatable_relocs*); | |
1064 | ||
1065 | // Relocate a section during a relocatable link. | |
1066 | void | |
1067 | relocate_for_relocatable(const Relocate_info<32, big_endian>*, | |
1068 | unsigned int sh_type, | |
1069 | const unsigned char* prelocs, | |
1070 | size_t reloc_count, | |
1071 | Output_section* output_section, | |
1072 | off_t offset_in_output_section, | |
1073 | const Relocatable_relocs*, | |
1074 | unsigned char* view, | |
1075 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
1076 | section_size_type view_size, | |
1077 | unsigned char* reloc_view, | |
1078 | section_size_type reloc_view_size); | |
1079 | ||
1080 | // Return whether SYM is defined by the ABI. | |
1081 | bool | |
1082 | do_is_defined_by_abi(Symbol* sym) const | |
1083 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
1084 | ||
94cdfcff DK |
1085 | // Return the size of the GOT section. |
1086 | section_size_type | |
1087 | got_size() | |
1088 | { | |
1089 | gold_assert(this->got_ != NULL); | |
1090 | return this->got_->data_size(); | |
1091 | } | |
1092 | ||
4a657b0d DK |
1093 | // Map platform-specific reloc types |
1094 | static unsigned int | |
1095 | get_real_reloc_type (unsigned int r_type); | |
1096 | ||
b569affa DK |
1097 | // Get the default ARM target. |
1098 | static const Target_arm<big_endian>& | |
1099 | default_target() | |
1100 | { | |
1101 | gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM | |
1102 | && parameters->target().is_big_endian() == big_endian); | |
1103 | return static_cast<const Target_arm<big_endian>&>(parameters->target()); | |
1104 | } | |
1105 | ||
4a657b0d DK |
1106 | private: |
1107 | // The class which scans relocations. | |
1108 | class Scan | |
1109 | { | |
1110 | public: | |
1111 | Scan() | |
bec53400 | 1112 | : issued_non_pic_error_(false) |
4a657b0d DK |
1113 | { } |
1114 | ||
1115 | inline void | |
1116 | local(const General_options& options, Symbol_table* symtab, | |
1117 | Layout* layout, Target_arm* target, | |
1118 | Sized_relobj<32, big_endian>* object, | |
1119 | unsigned int data_shndx, | |
1120 | Output_section* output_section, | |
1121 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1122 | const elfcpp::Sym<32, big_endian>& lsym); | |
1123 | ||
1124 | inline void | |
1125 | global(const General_options& options, Symbol_table* symtab, | |
1126 | Layout* layout, Target_arm* target, | |
1127 | Sized_relobj<32, big_endian>* object, | |
1128 | unsigned int data_shndx, | |
1129 | Output_section* output_section, | |
1130 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1131 | Symbol* gsym); | |
1132 | ||
1133 | private: | |
1134 | static void | |
1135 | unsupported_reloc_local(Sized_relobj<32, big_endian>*, | |
1136 | unsigned int r_type); | |
1137 | ||
1138 | static void | |
1139 | unsupported_reloc_global(Sized_relobj<32, big_endian>*, | |
1140 | unsigned int r_type, Symbol*); | |
bec53400 DK |
1141 | |
1142 | void | |
1143 | check_non_pic(Relobj*, unsigned int r_type); | |
1144 | ||
1145 | // Almost identical to Symbol::needs_plt_entry except that it also | |
1146 | // handles STT_ARM_TFUNC. | |
1147 | static bool | |
1148 | symbol_needs_plt_entry(const Symbol* sym) | |
1149 | { | |
1150 | // An undefined symbol from an executable does not need a PLT entry. | |
1151 | if (sym->is_undefined() && !parameters->options().shared()) | |
1152 | return false; | |
1153 | ||
1154 | return (!parameters->doing_static_link() | |
1155 | && (sym->type() == elfcpp::STT_FUNC | |
1156 | || sym->type() == elfcpp::STT_ARM_TFUNC) | |
1157 | && (sym->is_from_dynobj() | |
1158 | || sym->is_undefined() | |
1159 | || sym->is_preemptible())); | |
1160 | } | |
1161 | ||
1162 | // Whether we have issued an error about a non-PIC compilation. | |
1163 | bool issued_non_pic_error_; | |
4a657b0d DK |
1164 | }; |
1165 | ||
1166 | // The class which implements relocation. | |
1167 | class Relocate | |
1168 | { | |
1169 | public: | |
1170 | Relocate() | |
1171 | { } | |
1172 | ||
1173 | ~Relocate() | |
1174 | { } | |
1175 | ||
bec53400 DK |
1176 | // Return whether the static relocation needs to be applied. |
1177 | inline bool | |
1178 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
1179 | int ref_flags, | |
1180 | bool is_32bit, | |
1181 | Output_section* output_section); | |
1182 | ||
4a657b0d DK |
1183 | // Do a relocation. Return false if the caller should not issue |
1184 | // any warnings about this relocation. | |
1185 | inline bool | |
1186 | relocate(const Relocate_info<32, big_endian>*, Target_arm*, | |
1187 | Output_section*, size_t relnum, | |
1188 | const elfcpp::Rel<32, big_endian>&, | |
1189 | unsigned int r_type, const Sized_symbol<32>*, | |
1190 | const Symbol_value<32>*, | |
1191 | unsigned char*, elfcpp::Elf_types<32>::Elf_Addr, | |
1192 | section_size_type); | |
c121c671 DK |
1193 | |
1194 | // Return whether we want to pass flag NON_PIC_REF for this | |
1195 | // reloc. | |
1196 | static inline bool | |
1197 | reloc_is_non_pic (unsigned int r_type) | |
1198 | { | |
1199 | switch (r_type) | |
1200 | { | |
1201 | case elfcpp::R_ARM_REL32: | |
1202 | case elfcpp::R_ARM_THM_CALL: | |
1203 | case elfcpp::R_ARM_CALL: | |
1204 | case elfcpp::R_ARM_JUMP24: | |
1205 | case elfcpp::R_ARM_PREL31: | |
be8fcb75 ILT |
1206 | case elfcpp::R_ARM_THM_ABS5: |
1207 | case elfcpp::R_ARM_ABS8: | |
1208 | case elfcpp::R_ARM_ABS12: | |
1209 | case elfcpp::R_ARM_ABS16: | |
1210 | case elfcpp::R_ARM_BASE_ABS: | |
c121c671 DK |
1211 | return true; |
1212 | default: | |
1213 | return false; | |
1214 | } | |
1215 | } | |
4a657b0d DK |
1216 | }; |
1217 | ||
1218 | // A class which returns the size required for a relocation type, | |
1219 | // used while scanning relocs during a relocatable link. | |
1220 | class Relocatable_size_for_reloc | |
1221 | { | |
1222 | public: | |
1223 | unsigned int | |
1224 | get_size_for_reloc(unsigned int, Relobj*); | |
1225 | }; | |
1226 | ||
94cdfcff DK |
1227 | // Get the GOT section, creating it if necessary. |
1228 | Output_data_got<32, big_endian>* | |
1229 | got_section(Symbol_table*, Layout*); | |
1230 | ||
1231 | // Get the GOT PLT section. | |
1232 | Output_data_space* | |
1233 | got_plt_section() const | |
1234 | { | |
1235 | gold_assert(this->got_plt_ != NULL); | |
1236 | return this->got_plt_; | |
1237 | } | |
1238 | ||
1239 | // Create a PLT entry for a global symbol. | |
1240 | void | |
1241 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1242 | ||
1243 | // Get the PLT section. | |
1244 | const Output_data_plt_arm<big_endian>* | |
1245 | plt_section() const | |
1246 | { | |
1247 | gold_assert(this->plt_ != NULL); | |
1248 | return this->plt_; | |
1249 | } | |
1250 | ||
1251 | // Get the dynamic reloc section, creating it if necessary. | |
1252 | Reloc_section* | |
1253 | rel_dyn_section(Layout*); | |
1254 | ||
1255 | // Return true if the symbol may need a COPY relocation. | |
1256 | // References from an executable object to non-function symbols | |
1257 | // defined in a dynamic object may need a COPY relocation. | |
1258 | bool | |
1259 | may_need_copy_reloc(Symbol* gsym) | |
1260 | { | |
966d4097 DK |
1261 | return (gsym->type() != elfcpp::STT_ARM_TFUNC |
1262 | && gsym->may_need_copy_reloc()); | |
94cdfcff DK |
1263 | } |
1264 | ||
1265 | // Add a potential copy relocation. | |
1266 | void | |
1267 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
1268 | Sized_relobj<32, big_endian>* object, | |
1269 | unsigned int shndx, Output_section* output_section, | |
1270 | Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc) | |
1271 | { | |
1272 | this->copy_relocs_.copy_reloc(symtab, layout, | |
1273 | symtab->get_sized_symbol<32>(sym), | |
1274 | object, shndx, output_section, reloc, | |
1275 | this->rel_dyn_section(layout)); | |
1276 | } | |
1277 | ||
4a657b0d DK |
1278 | // Information about this specific target which we pass to the |
1279 | // general Target structure. | |
1280 | static const Target::Target_info arm_info; | |
94cdfcff DK |
1281 | |
1282 | // The types of GOT entries needed for this platform. | |
1283 | enum Got_type | |
1284 | { | |
1285 | GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol | |
1286 | }; | |
1287 | ||
1288 | // The GOT section. | |
1289 | Output_data_got<32, big_endian>* got_; | |
1290 | // The PLT section. | |
1291 | Output_data_plt_arm<big_endian>* plt_; | |
1292 | // The GOT PLT section. | |
1293 | Output_data_space* got_plt_; | |
1294 | // The dynamic reloc section. | |
1295 | Reloc_section* rel_dyn_; | |
1296 | // Relocs saved to avoid a COPY reloc. | |
1297 | Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_; | |
1298 | // Space for variables copied with a COPY reloc. | |
1299 | Output_data_space* dynbss_; | |
b569affa DK |
1300 | // Whether we can use BLX. |
1301 | bool may_use_blx_; | |
1302 | // Whether we force PIC branch veneers. | |
1303 | bool should_force_pic_veneer_; | |
4a657b0d DK |
1304 | }; |
1305 | ||
1306 | template<bool big_endian> | |
1307 | const Target::Target_info Target_arm<big_endian>::arm_info = | |
1308 | { | |
1309 | 32, // size | |
1310 | big_endian, // is_big_endian | |
1311 | elfcpp::EM_ARM, // machine_code | |
1312 | false, // has_make_symbol | |
1313 | false, // has_resolve | |
1314 | false, // has_code_fill | |
1315 | true, // is_default_stack_executable | |
1316 | '\0', // wrap_char | |
1317 | "/usr/lib/libc.so.1", // dynamic_linker | |
1318 | 0x8000, // default_text_segment_address | |
1319 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
1320 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
1321 | elfcpp::SHN_UNDEF, // small_common_shndx | |
1322 | elfcpp::SHN_UNDEF, // large_common_shndx | |
1323 | 0, // small_common_section_flags | |
1324 | 0 // large_common_section_flags | |
4a657b0d DK |
1325 | }; |
1326 | ||
c121c671 DK |
1327 | // Arm relocate functions class |
1328 | // | |
1329 | ||
1330 | template<bool big_endian> | |
1331 | class Arm_relocate_functions : public Relocate_functions<32, big_endian> | |
1332 | { | |
1333 | public: | |
1334 | typedef enum | |
1335 | { | |
1336 | STATUS_OKAY, // No error during relocation. | |
1337 | STATUS_OVERFLOW, // Relocation oveflow. | |
1338 | STATUS_BAD_RELOC // Relocation cannot be applied. | |
1339 | } Status; | |
1340 | ||
1341 | private: | |
1342 | typedef Relocate_functions<32, big_endian> Base; | |
1343 | typedef Arm_relocate_functions<big_endian> This; | |
1344 | ||
1345 | // Get an symbol value of *PSYMVAL with an ADDEND. This is a wrapper | |
1346 | // to Symbol_value::value(). If HAS_THUMB_BIT is true, that LSB is used | |
1347 | // to distinguish ARM and THUMB functions and it is treated specially. | |
1348 | static inline Symbol_value<32>::Value | |
1349 | arm_symbol_value (const Sized_relobj<32, big_endian> *object, | |
1350 | const Symbol_value<32>* psymval, | |
1351 | Symbol_value<32>::Value addend, | |
1352 | bool has_thumb_bit) | |
1353 | { | |
1354 | typedef Symbol_value<32>::Value Valtype; | |
1355 | ||
1356 | if (has_thumb_bit) | |
1357 | { | |
1358 | Valtype raw = psymval->value(object, 0); | |
1359 | Valtype thumb_bit = raw & 1; | |
1360 | return ((raw & ~((Valtype) 1)) + addend) | thumb_bit; | |
1361 | } | |
1362 | else | |
1363 | return psymval->value(object, addend); | |
1364 | } | |
1365 | ||
fd3c5f0b ILT |
1366 | // Encoding of imm16 argument for movt and movw ARM instructions |
1367 | // from ARM ARM: | |
1368 | // | |
1369 | // imm16 := imm4 | imm12 | |
1370 | // | |
1371 | // 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 | |
1372 | // +-------+---------------+-------+-------+-----------------------+ | |
1373 | // | | |imm4 | |imm12 | | |
1374 | // +-------+---------------+-------+-------+-----------------------+ | |
1375 | ||
1376 | // Extract the relocation addend from VAL based on the ARM | |
1377 | // instruction encoding described above. | |
1378 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1379 | extract_arm_movw_movt_addend( | |
1380 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1381 | { | |
1382 | // According to the Elf ABI for ARM Architecture the immediate | |
1383 | // field is sign-extended to form the addend. | |
1384 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | (val & 0xfff)); | |
1385 | } | |
1386 | ||
1387 | // Insert X into VAL based on the ARM instruction encoding described | |
1388 | // above. | |
1389 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1390 | insert_val_arm_movw_movt( | |
1391 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1392 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1393 | { | |
1394 | val &= 0xfff0f000; | |
1395 | val |= x & 0x0fff; | |
1396 | val |= (x & 0xf000) << 4; | |
1397 | return val; | |
1398 | } | |
1399 | ||
1400 | // Encoding of imm16 argument for movt and movw Thumb2 instructions | |
1401 | // from ARM ARM: | |
1402 | // | |
1403 | // imm16 := imm4 | i | imm3 | imm8 | |
1404 | // | |
1405 | // 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 | |
1406 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
1407 | // | |i| |imm4 || |imm3 | |imm8 | | |
1408 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
1409 | ||
1410 | // Extract the relocation addend from VAL based on the Thumb2 | |
1411 | // instruction encoding described above. | |
1412 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1413 | extract_thumb_movw_movt_addend( | |
1414 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1415 | { | |
1416 | // According to the Elf ABI for ARM Architecture the immediate | |
1417 | // field is sign-extended to form the addend. | |
1418 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | |
1419 | | ((val >> 15) & 0x0800) | |
1420 | | ((val >> 4) & 0x0700) | |
1421 | | (val & 0x00ff)); | |
1422 | } | |
1423 | ||
1424 | // Insert X into VAL based on the Thumb2 instruction encoding | |
1425 | // described above. | |
1426 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1427 | insert_val_thumb_movw_movt( | |
1428 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1429 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1430 | { | |
1431 | val &= 0xfbf08f00; | |
1432 | val |= (x & 0xf000) << 4; | |
1433 | val |= (x & 0x0800) << 15; | |
1434 | val |= (x & 0x0700) << 4; | |
1435 | val |= (x & 0x00ff); | |
1436 | return val; | |
1437 | } | |
1438 | ||
c121c671 DK |
1439 | // FIXME: This probably only works for Android on ARM v5te. We should |
1440 | // following GNU ld for the general case. | |
1441 | template<unsigned r_type> | |
1442 | static inline typename This::Status | |
1443 | arm_branch_common(unsigned char *view, | |
1444 | const Sized_relobj<32, big_endian>* object, | |
1445 | const Symbol_value<32>* psymval, | |
1446 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1447 | bool has_thumb_bit) | |
1448 | { | |
1449 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1450 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1451 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1452 | ||
1453 | bool insn_is_b = (((val >> 28) & 0xf) <= 0xe) | |
1454 | && ((val & 0x0f000000UL) == 0x0a000000UL); | |
1455 | bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL; | |
1456 | bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe) | |
1457 | && ((val & 0x0f000000UL) == 0x0b000000UL); | |
1458 | bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL; | |
1459 | bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL; | |
1460 | ||
1461 | if (r_type == elfcpp::R_ARM_CALL) | |
1462 | { | |
1463 | if (!insn_is_uncond_bl && !insn_is_blx) | |
1464 | return This::STATUS_BAD_RELOC; | |
1465 | } | |
1466 | else if (r_type == elfcpp::R_ARM_JUMP24) | |
1467 | { | |
1468 | if (!insn_is_b && !insn_is_cond_bl) | |
1469 | return This::STATUS_BAD_RELOC; | |
1470 | } | |
1471 | else if (r_type == elfcpp::R_ARM_PLT32) | |
1472 | { | |
1473 | if (!insn_is_any_branch) | |
1474 | return This::STATUS_BAD_RELOC; | |
1475 | } | |
1476 | else | |
1477 | gold_unreachable(); | |
1478 | ||
1479 | Valtype addend = utils::sign_extend<26>(val << 2); | |
1480 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1481 | - address); | |
1482 | ||
1483 | // If target has thumb bit set, we need to either turn the BL | |
1484 | // into a BLX (for ARMv5 or above) or generate a stub. | |
1485 | if (x & 1) | |
1486 | { | |
1487 | // Turn BL to BLX. | |
1488 | if (insn_is_uncond_bl) | |
1489 | val = (val & 0xffffff) | 0xfa000000 | ((x & 2) << 23); | |
1490 | else | |
1491 | return This::STATUS_BAD_RELOC; | |
1492 | } | |
1493 | else | |
1494 | gold_assert(!insn_is_blx); | |
1495 | ||
1496 | val = utils::bit_select(val, (x >> 2), 0xffffffUL); | |
1497 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1498 | return (utils::has_overflow<26>(x) | |
1499 | ? This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
1500 | } | |
1501 | ||
1502 | public: | |
5e445df6 ILT |
1503 | |
1504 | // R_ARM_ABS8: S + A | |
1505 | static inline typename This::Status | |
1506 | abs8(unsigned char *view, | |
1507 | const Sized_relobj<32, big_endian>* object, | |
be8fcb75 | 1508 | const Symbol_value<32>* psymval) |
5e445df6 ILT |
1509 | { |
1510 | typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype; | |
1511 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1512 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1513 | Valtype val = elfcpp::Swap<8, big_endian>::readval(wv); | |
1514 | Reltype addend = utils::sign_extend<8>(val); | |
be8fcb75 | 1515 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); |
5e445df6 ILT |
1516 | val = utils::bit_select(val, x, 0xffU); |
1517 | elfcpp::Swap<8, big_endian>::writeval(wv, val); | |
1518 | return (utils::has_signed_unsigned_overflow<8>(x) | |
1519 | ? This::STATUS_OVERFLOW | |
1520 | : This::STATUS_OKAY); | |
1521 | } | |
1522 | ||
be8fcb75 ILT |
1523 | // R_ARM_THM_ABS5: S + A |
1524 | static inline typename This::Status | |
1525 | thm_abs5(unsigned char *view, | |
1526 | const Sized_relobj<32, big_endian>* object, | |
1527 | const Symbol_value<32>* psymval) | |
1528 | { | |
1529 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1530 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1531 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1532 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
1533 | Reltype addend = (val & 0x7e0U) >> 6; | |
1534 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); | |
1535 | val = utils::bit_select(val, x << 6, 0x7e0U); | |
1536 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
1537 | return (utils::has_overflow<5>(x) | |
1538 | ? This::STATUS_OVERFLOW | |
1539 | : This::STATUS_OKAY); | |
1540 | } | |
1541 | ||
1542 | // R_ARM_ABS12: S + A | |
1543 | static inline typename This::Status | |
1544 | abs12(unsigned char *view, | |
1545 | const Sized_relobj<32, big_endian>* object, | |
1546 | const Symbol_value<32>* psymval) | |
1547 | { | |
1548 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1549 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1550 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1551 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1552 | Reltype addend = val & 0x0fffU; | |
1553 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); | |
1554 | val = utils::bit_select(val, x, 0x0fffU); | |
1555 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1556 | return (utils::has_overflow<12>(x) | |
1557 | ? This::STATUS_OVERFLOW | |
1558 | : This::STATUS_OKAY); | |
1559 | } | |
1560 | ||
1561 | // R_ARM_ABS16: S + A | |
1562 | static inline typename This::Status | |
1563 | abs16(unsigned char *view, | |
1564 | const Sized_relobj<32, big_endian>* object, | |
1565 | const Symbol_value<32>* psymval) | |
1566 | { | |
1567 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1568 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1569 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1570 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
1571 | Reltype addend = utils::sign_extend<16>(val); | |
1572 | Reltype x = This::arm_symbol_value(object, psymval, addend, false); | |
1573 | val = utils::bit_select(val, x, 0xffffU); | |
1574 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
1575 | return (utils::has_signed_unsigned_overflow<16>(x) | |
1576 | ? This::STATUS_OVERFLOW | |
1577 | : This::STATUS_OKAY); | |
1578 | } | |
1579 | ||
c121c671 DK |
1580 | // R_ARM_ABS32: (S + A) | T |
1581 | static inline typename This::Status | |
1582 | abs32(unsigned char *view, | |
1583 | const Sized_relobj<32, big_endian>* object, | |
1584 | const Symbol_value<32>* psymval, | |
1585 | bool has_thumb_bit) | |
1586 | { | |
1587 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1588 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1589 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
1590 | Valtype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit); | |
1591 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
1592 | return This::STATUS_OKAY; | |
1593 | } | |
1594 | ||
1595 | // R_ARM_REL32: (S + A) | T - P | |
1596 | static inline typename This::Status | |
1597 | rel32(unsigned char *view, | |
1598 | const Sized_relobj<32, big_endian>* object, | |
1599 | const Symbol_value<32>* psymval, | |
1600 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1601 | bool has_thumb_bit) | |
1602 | { | |
1603 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1604 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1605 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
1606 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1607 | - address); | |
1608 | elfcpp::Swap<32, big_endian>::writeval(wv, x); | |
1609 | return This::STATUS_OKAY; | |
1610 | } | |
1611 | ||
1612 | // R_ARM_THM_CALL: (S + A) | T - P | |
1613 | static inline typename This::Status | |
1614 | thm_call(unsigned char *view, | |
1615 | const Sized_relobj<32, big_endian>* object, | |
1616 | const Symbol_value<32>* psymval, | |
1617 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1618 | bool has_thumb_bit) | |
1619 | { | |
1620 | // A thumb call consists of two instructions. | |
1621 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1622 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1623 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1624 | Valtype hi = elfcpp::Swap<16, big_endian>::readval(wv); | |
1625 | Valtype lo = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
1626 | // Must be a BL instruction. lo == 11111xxxxxxxxxxx. | |
1627 | gold_assert((lo & 0xf800) == 0xf800); | |
1628 | Reltype addend = utils::sign_extend<23>(((hi & 0x7ff) << 12) | |
1629 | | ((lo & 0x7ff) << 1)); | |
1630 | Reltype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1631 | - address); | |
1632 | ||
1633 | // If target has no thumb bit set, we need to either turn the BL | |
1634 | // into a BLX (for ARMv5 or above) or generate a stub. | |
1635 | if ((x & 1) == 0) | |
1636 | { | |
1637 | // This only works for ARMv5 and above with interworking enabled. | |
1638 | lo &= 0xefff; | |
1639 | } | |
1640 | hi = utils::bit_select(hi, (x >> 12), 0x7ffU); | |
1641 | lo = utils::bit_select(lo, (x >> 1), 0x7ffU); | |
1642 | elfcpp::Swap<16, big_endian>::writeval(wv, hi); | |
1643 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lo); | |
1644 | return (utils::has_overflow<23>(x) | |
1645 | ? This::STATUS_OVERFLOW | |
1646 | : This::STATUS_OKAY); | |
1647 | } | |
1648 | ||
1649 | // R_ARM_BASE_PREL: B(S) + A - P | |
1650 | static inline typename This::Status | |
1651 | base_prel(unsigned char* view, | |
1652 | elfcpp::Elf_types<32>::Elf_Addr origin, | |
1653 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1654 | { | |
1655 | Base::rel32(view, origin - address); | |
1656 | return STATUS_OKAY; | |
1657 | } | |
1658 | ||
be8fcb75 ILT |
1659 | // R_ARM_BASE_ABS: B(S) + A |
1660 | static inline typename This::Status | |
1661 | base_abs(unsigned char* view, | |
1662 | elfcpp::Elf_types<32>::Elf_Addr origin) | |
1663 | { | |
1664 | Base::rel32(view, origin); | |
1665 | return STATUS_OKAY; | |
1666 | } | |
1667 | ||
c121c671 DK |
1668 | // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG |
1669 | static inline typename This::Status | |
1670 | got_brel(unsigned char* view, | |
1671 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset) | |
1672 | { | |
1673 | Base::rel32(view, got_offset); | |
1674 | return This::STATUS_OKAY; | |
1675 | } | |
1676 | ||
7f5309a5 ILT |
1677 | // R_ARM_GOT_PREL: GOT(S) + A – P |
1678 | static inline typename This::Status | |
1679 | got_prel(unsigned char* view, | |
1680 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset, | |
1681 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1682 | { | |
1683 | Base::rel32(view, got_offset - address); | |
1684 | return This::STATUS_OKAY; | |
1685 | } | |
1686 | ||
c121c671 DK |
1687 | // R_ARM_PLT32: (S + A) | T - P |
1688 | static inline typename This::Status | |
1689 | plt32(unsigned char *view, | |
1690 | const Sized_relobj<32, big_endian>* object, | |
1691 | const Symbol_value<32>* psymval, | |
1692 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1693 | bool has_thumb_bit) | |
1694 | { | |
1695 | return arm_branch_common<elfcpp::R_ARM_PLT32>(view, object, psymval, | |
1696 | address, has_thumb_bit); | |
1697 | } | |
1698 | ||
1699 | // R_ARM_CALL: (S + A) | T - P | |
1700 | static inline typename This::Status | |
1701 | call(unsigned char *view, | |
1702 | const Sized_relobj<32, big_endian>* object, | |
1703 | const Symbol_value<32>* psymval, | |
1704 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1705 | bool has_thumb_bit) | |
1706 | { | |
1707 | return arm_branch_common<elfcpp::R_ARM_CALL>(view, object, psymval, | |
1708 | address, has_thumb_bit); | |
1709 | } | |
1710 | ||
1711 | // R_ARM_JUMP24: (S + A) | T - P | |
1712 | static inline typename This::Status | |
1713 | jump24(unsigned char *view, | |
1714 | const Sized_relobj<32, big_endian>* object, | |
1715 | const Symbol_value<32>* psymval, | |
1716 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1717 | bool has_thumb_bit) | |
1718 | { | |
1719 | return arm_branch_common<elfcpp::R_ARM_JUMP24>(view, object, psymval, | |
1720 | address, has_thumb_bit); | |
1721 | } | |
1722 | ||
1723 | // R_ARM_PREL: (S + A) | T - P | |
1724 | static inline typename This::Status | |
1725 | prel31(unsigned char *view, | |
1726 | const Sized_relobj<32, big_endian>* object, | |
1727 | const Symbol_value<32>* psymval, | |
1728 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1729 | bool has_thumb_bit) | |
1730 | { | |
1731 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1732 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1733 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1734 | Valtype addend = utils::sign_extend<31>(val); | |
1735 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1736 | - address); | |
1737 | val = utils::bit_select(val, x, 0x7fffffffU); | |
1738 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1739 | return (utils::has_overflow<31>(x) ? | |
1740 | This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
1741 | } | |
fd3c5f0b ILT |
1742 | |
1743 | // R_ARM_MOVW_ABS_NC: (S + A) | T | |
1744 | static inline typename This::Status | |
1745 | movw_abs_nc(unsigned char *view, | |
1746 | const Sized_relobj<32, big_endian>* object, | |
1747 | const Symbol_value<32>* psymval, | |
1748 | bool has_thumb_bit) | |
1749 | { | |
1750 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1751 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1752 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1753 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1754 | Valtype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit); | |
1755 | val = This::insert_val_arm_movw_movt(val, x); | |
1756 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1757 | return This::STATUS_OKAY; | |
1758 | } | |
1759 | ||
1760 | // R_ARM_MOVT_ABS: S + A | |
1761 | static inline typename This::Status | |
1762 | movt_abs(unsigned char *view, | |
1763 | const Sized_relobj<32, big_endian>* object, | |
1764 | const Symbol_value<32>* psymval) | |
1765 | { | |
1766 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1767 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1768 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1769 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1770 | Valtype x = This::arm_symbol_value(object, psymval, addend, 0) >> 16; | |
1771 | val = This::insert_val_arm_movw_movt(val, x); | |
1772 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1773 | return This::STATUS_OKAY; | |
1774 | } | |
1775 | ||
1776 | // R_ARM_THM_MOVW_ABS_NC: S + A | T | |
1777 | static inline typename This::Status | |
1778 | thm_movw_abs_nc(unsigned char *view, | |
1779 | const Sized_relobj<32, big_endian>* object, | |
1780 | const Symbol_value<32>* psymval, | |
1781 | bool has_thumb_bit) | |
1782 | { | |
1783 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1784 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1785 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1786 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1787 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
1788 | Reltype addend = extract_thumb_movw_movt_addend(val); | |
1789 | Reltype x = This::arm_symbol_value(object, psymval, addend, has_thumb_bit); | |
1790 | val = This::insert_val_thumb_movw_movt(val, x); | |
1791 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1792 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1793 | return This::STATUS_OKAY; | |
1794 | } | |
1795 | ||
1796 | // R_ARM_THM_MOVT_ABS: S + A | |
1797 | static inline typename This::Status | |
1798 | thm_movt_abs(unsigned char *view, | |
1799 | const Sized_relobj<32, big_endian>* object, | |
1800 | const Symbol_value<32>* psymval) | |
1801 | { | |
1802 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1803 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1804 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1805 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1806 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
1807 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
1808 | Reltype x = This::arm_symbol_value(object, psymval, addend, 0) >> 16; | |
1809 | val = This::insert_val_thumb_movw_movt(val, x); | |
1810 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1811 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1812 | return This::STATUS_OKAY; | |
1813 | } | |
1814 | ||
c2a122b6 ILT |
1815 | // R_ARM_MOVW_PREL_NC: (S + A) | T - P |
1816 | static inline typename This::Status | |
1817 | movw_prel_nc(unsigned char *view, | |
1818 | const Sized_relobj<32, big_endian>* object, | |
1819 | const Symbol_value<32>* psymval, | |
1820 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1821 | bool has_thumb_bit) | |
1822 | { | |
1823 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1824 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1825 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1826 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1827 | Valtype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1828 | - address); | |
1829 | val = This::insert_val_arm_movw_movt(val, x); | |
1830 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1831 | return This::STATUS_OKAY; | |
1832 | } | |
1833 | ||
1834 | // R_ARM_MOVT_PREL: S + A - P | |
1835 | static inline typename This::Status | |
1836 | movt_prel(unsigned char *view, | |
1837 | const Sized_relobj<32, big_endian>* object, | |
1838 | const Symbol_value<32>* psymval, | |
1839 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1840 | { | |
1841 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1842 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1843 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1844 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
1845 | Valtype x = (This::arm_symbol_value(object, psymval, addend, 0) | |
1846 | - address) >> 16; | |
1847 | val = This::insert_val_arm_movw_movt(val, x); | |
1848 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1849 | return This::STATUS_OKAY; | |
1850 | } | |
1851 | ||
1852 | // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P | |
1853 | static inline typename This::Status | |
1854 | thm_movw_prel_nc(unsigned char *view, | |
1855 | const Sized_relobj<32, big_endian>* object, | |
1856 | const Symbol_value<32>* psymval, | |
1857 | elfcpp::Elf_types<32>::Elf_Addr address, | |
1858 | bool has_thumb_bit) | |
1859 | { | |
1860 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1861 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1862 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1863 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1864 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
1865 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
1866 | Reltype x = (This::arm_symbol_value(object, psymval, addend, has_thumb_bit) | |
1867 | - address); | |
1868 | val = This::insert_val_thumb_movw_movt(val, x); | |
1869 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1870 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1871 | return This::STATUS_OKAY; | |
1872 | } | |
1873 | ||
1874 | // R_ARM_THM_MOVT_PREL: S + A - P | |
1875 | static inline typename This::Status | |
1876 | thm_movt_prel(unsigned char *view, | |
1877 | const Sized_relobj<32, big_endian>* object, | |
1878 | const Symbol_value<32>* psymval, | |
1879 | elfcpp::Elf_types<32>::Elf_Addr address) | |
1880 | { | |
1881 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1882 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1883 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1884 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
1885 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
1886 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
1887 | Reltype x = (This::arm_symbol_value(object, psymval, addend, 0) | |
1888 | - address) >> 16; | |
1889 | val = This::insert_val_thumb_movw_movt(val, x); | |
1890 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
1891 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
1892 | return This::STATUS_OKAY; | |
1893 | } | |
c121c671 DK |
1894 | }; |
1895 | ||
94cdfcff DK |
1896 | // Get the GOT section, creating it if necessary. |
1897 | ||
1898 | template<bool big_endian> | |
1899 | Output_data_got<32, big_endian>* | |
1900 | Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout) | |
1901 | { | |
1902 | if (this->got_ == NULL) | |
1903 | { | |
1904 | gold_assert(symtab != NULL && layout != NULL); | |
1905 | ||
1906 | this->got_ = new Output_data_got<32, big_endian>(); | |
1907 | ||
1908 | Output_section* os; | |
1909 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1910 | (elfcpp::SHF_ALLOC | |
1911 | | elfcpp::SHF_WRITE), | |
1912 | this->got_); | |
1913 | os->set_is_relro(); | |
1914 | ||
1915 | // The old GNU linker creates a .got.plt section. We just | |
1916 | // create another set of data in the .got section. Note that we | |
1917 | // always create a PLT if we create a GOT, although the PLT | |
1918 | // might be empty. | |
1919 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); | |
1920 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1921 | (elfcpp::SHF_ALLOC | |
1922 | | elfcpp::SHF_WRITE), | |
1923 | this->got_plt_); | |
1924 | os->set_is_relro(); | |
1925 | ||
1926 | // The first three entries are reserved. | |
1927 | this->got_plt_->set_current_data_size(3 * 4); | |
1928 | ||
1929 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1930 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1931 | this->got_plt_, | |
1932 | 0, 0, elfcpp::STT_OBJECT, | |
1933 | elfcpp::STB_LOCAL, | |
1934 | elfcpp::STV_HIDDEN, 0, | |
1935 | false, false); | |
1936 | } | |
1937 | return this->got_; | |
1938 | } | |
1939 | ||
1940 | // Get the dynamic reloc section, creating it if necessary. | |
1941 | ||
1942 | template<bool big_endian> | |
1943 | typename Target_arm<big_endian>::Reloc_section* | |
1944 | Target_arm<big_endian>::rel_dyn_section(Layout* layout) | |
1945 | { | |
1946 | if (this->rel_dyn_ == NULL) | |
1947 | { | |
1948 | gold_assert(layout != NULL); | |
1949 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
1950 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1951 | elfcpp::SHF_ALLOC, this->rel_dyn_); | |
1952 | } | |
1953 | return this->rel_dyn_; | |
1954 | } | |
1955 | ||
b569affa DK |
1956 | // Insn_template methods. |
1957 | ||
1958 | // Return byte size of an instruction template. | |
1959 | ||
1960 | size_t | |
1961 | Insn_template::size() const | |
1962 | { | |
1963 | switch (this->type()) | |
1964 | { | |
1965 | case THUMB16_TYPE: | |
1966 | return 2; | |
1967 | case ARM_TYPE: | |
1968 | case THUMB32_TYPE: | |
1969 | case DATA_TYPE: | |
1970 | return 4; | |
1971 | default: | |
1972 | gold_unreachable(); | |
1973 | } | |
1974 | } | |
1975 | ||
1976 | // Return alignment of an instruction template. | |
1977 | ||
1978 | unsigned | |
1979 | Insn_template::alignment() const | |
1980 | { | |
1981 | switch (this->type()) | |
1982 | { | |
1983 | case THUMB16_TYPE: | |
1984 | case THUMB32_TYPE: | |
1985 | return 2; | |
1986 | case ARM_TYPE: | |
1987 | case DATA_TYPE: | |
1988 | return 4; | |
1989 | default: | |
1990 | gold_unreachable(); | |
1991 | } | |
1992 | } | |
1993 | ||
1994 | // Stub_template methods. | |
1995 | ||
1996 | Stub_template::Stub_template( | |
1997 | Stub_type type, const Insn_template* insns, | |
1998 | size_t insn_count) | |
1999 | : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1), | |
2000 | entry_in_thumb_mode_(false), relocs_() | |
2001 | { | |
2002 | off_t offset = 0; | |
2003 | ||
2004 | // Compute byte size and alignment of stub template. | |
2005 | for (size_t i = 0; i < insn_count; i++) | |
2006 | { | |
2007 | unsigned insn_alignment = insns[i].alignment(); | |
2008 | size_t insn_size = insns[i].size(); | |
2009 | gold_assert((offset & (insn_alignment - 1)) == 0); | |
2010 | this->alignment_ = std::max(this->alignment_, insn_alignment); | |
2011 | switch (insns[i].type()) | |
2012 | { | |
2013 | case Insn_template::THUMB16_TYPE: | |
2014 | if (i == 0) | |
2015 | this->entry_in_thumb_mode_ = true; | |
2016 | break; | |
2017 | ||
2018 | case Insn_template::THUMB32_TYPE: | |
2019 | if (insns[i].r_type() != elfcpp::R_ARM_NONE) | |
2020 | this->relocs_.push_back(Reloc(i, offset)); | |
2021 | if (i == 0) | |
2022 | this->entry_in_thumb_mode_ = true; | |
2023 | break; | |
2024 | ||
2025 | case Insn_template::ARM_TYPE: | |
2026 | // Handle cases where the target is encoded within the | |
2027 | // instruction. | |
2028 | if (insns[i].r_type() == elfcpp::R_ARM_JUMP24) | |
2029 | this->relocs_.push_back(Reloc(i, offset)); | |
2030 | break; | |
2031 | ||
2032 | case Insn_template::DATA_TYPE: | |
2033 | // Entry point cannot be data. | |
2034 | gold_assert(i != 0); | |
2035 | this->relocs_.push_back(Reloc(i, offset)); | |
2036 | break; | |
2037 | ||
2038 | default: | |
2039 | gold_unreachable(); | |
2040 | } | |
2041 | offset += insn_size; | |
2042 | } | |
2043 | this->size_ = offset; | |
2044 | } | |
2045 | ||
2046 | // Reloc_stub::Key methods. | |
2047 | ||
2048 | // Dump a Key as a string for debugging. | |
2049 | ||
2050 | std::string | |
2051 | Reloc_stub::Key::name() const | |
2052 | { | |
2053 | if (this->r_sym_ == invalid_index) | |
2054 | { | |
2055 | // Global symbol key name | |
2056 | // <stub-type>:<symbol name>:<addend>. | |
2057 | const std::string sym_name = this->u_.symbol->name(); | |
2058 | // We need to print two hex number and two colons. So just add 100 bytes | |
2059 | // to the symbol name size. | |
2060 | size_t len = sym_name.size() + 100; | |
2061 | char* buffer = new char[len]; | |
2062 | int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_, | |
2063 | sym_name.c_str(), this->addend_); | |
2064 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
2065 | delete[] buffer; | |
2066 | return std::string(buffer); | |
2067 | } | |
2068 | else | |
2069 | { | |
2070 | // local symbol key name | |
2071 | // <stub-type>:<object>:<r_sym>:<addend>. | |
2072 | const size_t len = 200; | |
2073 | char buffer[len]; | |
2074 | int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_, | |
2075 | this->u_.relobj, this->r_sym_, this->addend_); | |
2076 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
2077 | return std::string(buffer); | |
2078 | } | |
2079 | } | |
2080 | ||
2081 | // Reloc_stub methods. | |
2082 | ||
2083 | // Determine the type of stub needed, if any, for a relocation of R_TYPE at | |
2084 | // LOCATION to DESTINATION. | |
2085 | // This code is based on the arm_type_of_stub function in | |
2086 | // bfd/elf32-arm.c. We have changed the interface a liitle to keep the Stub | |
2087 | // class simple. | |
2088 | ||
2089 | Stub_type | |
2090 | Reloc_stub::stub_type_for_reloc( | |
2091 | unsigned int r_type, | |
2092 | Arm_address location, | |
2093 | Arm_address destination, | |
2094 | bool target_is_thumb) | |
2095 | { | |
2096 | Stub_type stub_type = arm_stub_none; | |
2097 | ||
2098 | // This is a bit ugly but we want to avoid using a templated class for | |
2099 | // big and little endianities. | |
2100 | bool may_use_blx; | |
2101 | bool should_force_pic_veneer; | |
2102 | bool thumb2; | |
2103 | bool thumb_only; | |
2104 | if (parameters->target().is_big_endian()) | |
2105 | { | |
2106 | const Target_arm<true>& big_endian_target = | |
2107 | Target_arm<true>::default_target(); | |
2108 | may_use_blx = big_endian_target.may_use_blx(); | |
2109 | should_force_pic_veneer = big_endian_target.should_force_pic_veneer(); | |
2110 | thumb2 = big_endian_target.using_thumb2(); | |
2111 | thumb_only = big_endian_target.using_thumb_only(); | |
2112 | } | |
2113 | else | |
2114 | { | |
2115 | const Target_arm<false>& little_endian_target = | |
2116 | Target_arm<false>::default_target(); | |
2117 | may_use_blx = little_endian_target.may_use_blx(); | |
2118 | should_force_pic_veneer = little_endian_target.should_force_pic_veneer(); | |
2119 | thumb2 = little_endian_target.using_thumb2(); | |
2120 | thumb_only = little_endian_target.using_thumb_only(); | |
2121 | } | |
2122 | ||
2123 | int64_t branch_offset = (int64_t)destination - location; | |
2124 | ||
2125 | if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24) | |
2126 | { | |
2127 | // Handle cases where: | |
2128 | // - this call goes too far (different Thumb/Thumb2 max | |
2129 | // distance) | |
2130 | // - it's a Thumb->Arm call and blx is not available, or it's a | |
2131 | // Thumb->Arm branch (not bl). A stub is needed in this case. | |
2132 | if ((!thumb2 | |
2133 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
2134 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
2135 | || (thumb2 | |
2136 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
2137 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
2138 | || ((!target_is_thumb) | |
2139 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
2140 | || (r_type == elfcpp::R_ARM_THM_JUMP24)))) | |
2141 | { | |
2142 | if (target_is_thumb) | |
2143 | { | |
2144 | // Thumb to thumb. | |
2145 | if (!thumb_only) | |
2146 | { | |
2147 | stub_type = (parameters->options().shared() | should_force_pic_veneer) | |
2148 | // PIC stubs. | |
2149 | ? ((may_use_blx | |
2150 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2151 | // V5T and above. Stub starts with ARM code, so | |
2152 | // we must be able to switch mode before | |
2153 | // reaching it, which is only possible for 'bl' | |
2154 | // (ie R_ARM_THM_CALL relocation). | |
2155 | ? arm_stub_long_branch_any_thumb_pic | |
2156 | // On V4T, use Thumb code only. | |
2157 | : arm_stub_long_branch_v4t_thumb_thumb_pic) | |
2158 | ||
2159 | // non-PIC stubs. | |
2160 | : ((may_use_blx | |
2161 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2162 | ? arm_stub_long_branch_any_any // V5T and above. | |
2163 | : arm_stub_long_branch_v4t_thumb_thumb); // V4T. | |
2164 | } | |
2165 | else | |
2166 | { | |
2167 | stub_type = (parameters->options().shared() | should_force_pic_veneer) | |
2168 | ? arm_stub_long_branch_thumb_only_pic // PIC stub. | |
2169 | : arm_stub_long_branch_thumb_only; // non-PIC stub. | |
2170 | } | |
2171 | } | |
2172 | else | |
2173 | { | |
2174 | // Thumb to arm. | |
2175 | ||
2176 | // FIXME: We should check that the input section is from an | |
2177 | // object that has interwork enabled. | |
2178 | ||
2179 | stub_type = (parameters->options().shared() | |
2180 | || should_force_pic_veneer) | |
2181 | // PIC stubs. | |
2182 | ? ((may_use_blx | |
2183 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2184 | ? arm_stub_long_branch_any_arm_pic // V5T and above. | |
2185 | : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T. | |
2186 | ||
2187 | // non-PIC stubs. | |
2188 | : ((may_use_blx | |
2189 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2190 | ? arm_stub_long_branch_any_any // V5T and above. | |
2191 | : arm_stub_long_branch_v4t_thumb_arm); // V4T. | |
2192 | ||
2193 | // Handle v4t short branches. | |
2194 | if ((stub_type == arm_stub_long_branch_v4t_thumb_arm) | |
2195 | && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET) | |
2196 | && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET)) | |
2197 | stub_type = arm_stub_short_branch_v4t_thumb_arm; | |
2198 | } | |
2199 | } | |
2200 | } | |
2201 | else if (r_type == elfcpp::R_ARM_CALL | |
2202 | || r_type == elfcpp::R_ARM_JUMP24 | |
2203 | || r_type == elfcpp::R_ARM_PLT32) | |
2204 | { | |
2205 | if (target_is_thumb) | |
2206 | { | |
2207 | // Arm to thumb. | |
2208 | ||
2209 | // FIXME: We should check that the input section is from an | |
2210 | // object that has interwork enabled. | |
2211 | ||
2212 | // We have an extra 2-bytes reach because of | |
2213 | // the mode change (bit 24 (H) of BLX encoding). | |
2214 | if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2) | |
2215 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
2216 | || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx) | |
2217 | || (r_type == elfcpp::R_ARM_JUMP24) | |
2218 | || (r_type == elfcpp::R_ARM_PLT32)) | |
2219 | { | |
2220 | stub_type = (parameters->options().shared() | |
2221 | || should_force_pic_veneer) | |
2222 | // PIC stubs. | |
2223 | ? (may_use_blx | |
2224 | ? arm_stub_long_branch_any_thumb_pic// V5T and above. | |
2225 | : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub. | |
2226 | ||
2227 | // non-PIC stubs. | |
2228 | : (may_use_blx | |
2229 | ? arm_stub_long_branch_any_any // V5T and above. | |
2230 | : arm_stub_long_branch_v4t_arm_thumb); // V4T. | |
2231 | } | |
2232 | } | |
2233 | else | |
2234 | { | |
2235 | // Arm to arm. | |
2236 | if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET | |
2237 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)) | |
2238 | { | |
2239 | stub_type = (parameters->options().shared() | |
2240 | || should_force_pic_veneer) | |
2241 | ? arm_stub_long_branch_any_arm_pic // PIC stubs. | |
2242 | : arm_stub_long_branch_any_any; /// non-PIC. | |
2243 | } | |
2244 | } | |
2245 | } | |
2246 | ||
2247 | return stub_type; | |
2248 | } | |
2249 | ||
2250 | // Template to implement do_write for a specific target endianity. | |
2251 | ||
2252 | template<bool big_endian> | |
2253 | void inline | |
2254 | Reloc_stub::do_fixed_endian_write(unsigned char* view, | |
2255 | section_size_type view_size) | |
2256 | { | |
2257 | const Stub_template* stub_template = this->stub_template(); | |
2258 | const Insn_template* insns = stub_template->insns(); | |
2259 | ||
2260 | // FIXME: We do not handle BE8 encoding yet. | |
2261 | unsigned char* pov = view; | |
2262 | for (size_t i = 0; i < stub_template->insn_count(); i++) | |
2263 | { | |
2264 | switch (insns[i].type()) | |
2265 | { | |
2266 | case Insn_template::THUMB16_TYPE: | |
2267 | // Non-zero reloc addends are only used in Cortex-A8 stubs. | |
2268 | gold_assert(insns[i].reloc_addend() == 0); | |
2269 | elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff); | |
2270 | break; | |
2271 | case Insn_template::THUMB32_TYPE: | |
2272 | { | |
2273 | uint32_t hi = (insns[i].data() >> 16) & 0xffff; | |
2274 | uint32_t lo = insns[i].data() & 0xffff; | |
2275 | elfcpp::Swap<16, big_endian>::writeval(pov, hi); | |
2276 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo); | |
2277 | } | |
2278 | break; | |
2279 | case Insn_template::ARM_TYPE: | |
2280 | case Insn_template::DATA_TYPE: | |
2281 | elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data()); | |
2282 | break; | |
2283 | default: | |
2284 | gold_unreachable(); | |
2285 | } | |
2286 | pov += insns[i].size(); | |
2287 | } | |
2288 | gold_assert(static_cast<section_size_type>(pov - view) == view_size); | |
2289 | } | |
2290 | ||
2291 | // Write a reloc stub to VIEW with endianity specified by BIG_ENDIAN. | |
2292 | ||
2293 | void | |
2294 | Reloc_stub::do_write(unsigned char* view, section_size_type view_size, | |
2295 | bool big_endian) | |
2296 | { | |
2297 | if (big_endian) | |
2298 | this->do_fixed_endian_write<true>(view, view_size); | |
2299 | else | |
2300 | this->do_fixed_endian_write<false>(view, view_size); | |
2301 | } | |
2302 | ||
2303 | // Stub_factory methods. | |
2304 | ||
2305 | Stub_factory::Stub_factory() | |
2306 | { | |
2307 | // The instruction template sequences are declared as static | |
2308 | // objects and initialized first time the constructor runs. | |
2309 | ||
2310 | // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx | |
2311 | // to reach the stub if necessary. | |
2312 | static const Insn_template elf32_arm_stub_long_branch_any_any[] = | |
2313 | { | |
2314 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
2315 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2316 | // dcd R_ARM_ABS32(X) | |
2317 | }; | |
2318 | ||
2319 | // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not | |
2320 | // available. | |
2321 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] = | |
2322 | { | |
2323 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
2324 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2325 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2326 | // dcd R_ARM_ABS32(X) | |
2327 | }; | |
2328 | ||
2329 | // Thumb -> Thumb long branch stub. Used on M-profile architectures. | |
2330 | static const Insn_template elf32_arm_stub_long_branch_thumb_only[] = | |
2331 | { | |
2332 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
2333 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
2334 | Insn_template::thumb16_insn(0x4684), // mov ip, r0 | |
2335 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
2336 | Insn_template::thumb16_insn(0x4760), // bx ip | |
2337 | Insn_template::thumb16_insn(0xbf00), // nop | |
2338 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2339 | // dcd R_ARM_ABS32(X) | |
2340 | }; | |
2341 | ||
2342 | // V4T Thumb -> Thumb long branch stub. Using the stack is not | |
2343 | // allowed. | |
2344 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] = | |
2345 | { | |
2346 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2347 | Insn_template::thumb16_insn(0x46c0), // nop | |
2348 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
2349 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2350 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2351 | // dcd R_ARM_ABS32(X) | |
2352 | }; | |
2353 | ||
2354 | // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not | |
2355 | // available. | |
2356 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] = | |
2357 | { | |
2358 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2359 | Insn_template::thumb16_insn(0x46c0), // nop | |
2360 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
2361 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
2362 | // dcd R_ARM_ABS32(X) | |
2363 | }; | |
2364 | ||
2365 | // V4T Thumb -> ARM short branch stub. Shorter variant of the above | |
2366 | // one, when the destination is close enough. | |
2367 | static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] = | |
2368 | { | |
2369 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2370 | Insn_template::thumb16_insn(0x46c0), // nop | |
2371 | Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8) | |
2372 | }; | |
2373 | ||
2374 | // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use | |
2375 | // blx to reach the stub if necessary. | |
2376 | static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] = | |
2377 | { | |
2378 | Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc] | |
2379 | Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip | |
2380 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
2381 | // dcd R_ARM_REL32(X-4) | |
2382 | }; | |
2383 | ||
2384 | // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use | |
2385 | // blx to reach the stub if necessary. We can not add into pc; | |
2386 | // it is not guaranteed to mode switch (different in ARMv6 and | |
2387 | // ARMv7). | |
2388 | static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] = | |
2389 | { | |
2390 | Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4] | |
2391 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
2392 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2393 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
2394 | // dcd R_ARM_REL32(X) | |
2395 | }; | |
2396 | ||
2397 | // V4T ARM -> ARM long branch stub, PIC. | |
2398 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] = | |
2399 | { | |
2400 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
2401 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
2402 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2403 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
2404 | // dcd R_ARM_REL32(X) | |
2405 | }; | |
2406 | ||
2407 | // V4T Thumb -> ARM long branch stub, PIC. | |
2408 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] = | |
2409 | { | |
2410 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2411 | Insn_template::thumb16_insn(0x46c0), // nop | |
2412 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
2413 | Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc | |
2414 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
2415 | // dcd R_ARM_REL32(X) | |
2416 | }; | |
2417 | ||
2418 | // Thumb -> Thumb long branch stub, PIC. Used on M-profile | |
2419 | // architectures. | |
2420 | static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] = | |
2421 | { | |
2422 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
2423 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
2424 | Insn_template::thumb16_insn(0x46fc), // mov ip, pc | |
2425 | Insn_template::thumb16_insn(0x4484), // add ip, r0 | |
2426 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
2427 | Insn_template::thumb16_insn(0x4760), // bx ip | |
2428 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4), | |
2429 | // dcd R_ARM_REL32(X) | |
2430 | }; | |
2431 | ||
2432 | // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not | |
2433 | // allowed. | |
2434 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] = | |
2435 | { | |
2436 | Insn_template::thumb16_insn(0x4778), // bx pc | |
2437 | Insn_template::thumb16_insn(0x46c0), // nop | |
2438 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
2439 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
2440 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
2441 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
2442 | // dcd R_ARM_REL32(X) | |
2443 | }; | |
2444 | ||
2445 | // Cortex-A8 erratum-workaround stubs. | |
2446 | ||
2447 | // Stub used for conditional branches (which may be beyond +/-1MB away, | |
2448 | // so we can't use a conditional branch to reach this stub). | |
2449 | ||
2450 | // original code: | |
2451 | // | |
2452 | // b<cond> X | |
2453 | // after: | |
2454 | // | |
2455 | static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] = | |
2456 | { | |
2457 | Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true | |
2458 | Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after | |
2459 | Insn_template::thumb32_b_insn(0xf000b800, -4) // true: | |
2460 | // b.w X | |
2461 | }; | |
2462 | ||
2463 | // Stub used for b.w and bl.w instructions. | |
2464 | ||
2465 | static const Insn_template elf32_arm_stub_a8_veneer_b[] = | |
2466 | { | |
2467 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
2468 | }; | |
2469 | ||
2470 | static const Insn_template elf32_arm_stub_a8_veneer_bl[] = | |
2471 | { | |
2472 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
2473 | }; | |
2474 | ||
2475 | // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w | |
2476 | // instruction (which switches to ARM mode) to point to this stub. Jump to | |
2477 | // the real destination using an ARM-mode branch. | |
2478 | const Insn_template elf32_arm_stub_a8_veneer_blx[] = | |
2479 | { | |
2480 | Insn_template::arm_rel_insn(0xea000000, -8) // b dest | |
2481 | }; | |
2482 | ||
2483 | // Fill in the stub template look-up table. Stub templates are constructed | |
2484 | // per instance of Stub_factory for fast look-up without locking | |
2485 | // in a thread-enabled environment. | |
2486 | ||
2487 | this->stub_templates_[arm_stub_none] = | |
2488 | new Stub_template(arm_stub_none, NULL, 0); | |
2489 | ||
2490 | #define DEF_STUB(x) \ | |
2491 | do \ | |
2492 | { \ | |
2493 | size_t array_size \ | |
2494 | = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \ | |
2495 | Stub_type type = arm_stub_##x; \ | |
2496 | this->stub_templates_[type] = \ | |
2497 | new Stub_template(type, elf32_arm_stub_##x, array_size); \ | |
2498 | } \ | |
2499 | while (0); | |
2500 | ||
2501 | DEF_STUBS | |
2502 | #undef DEF_STUB | |
2503 | } | |
2504 | ||
56ee5e00 DK |
2505 | // Stub_table methods. |
2506 | ||
2507 | // Add a STUB with using KEY. Caller is reponsible for avoid adding | |
2508 | // if already a STUB with the same key has been added. | |
2509 | ||
2510 | template<bool big_endian> | |
2511 | void | |
2512 | Stub_table<big_endian>::add_reloc_stub( | |
2513 | Reloc_stub* stub, | |
2514 | const Reloc_stub::Key& key) | |
2515 | { | |
2516 | const Stub_template* stub_template = stub->stub_template(); | |
2517 | gold_assert(stub_template->type() == key.stub_type()); | |
2518 | this->reloc_stubs_[key] = stub; | |
2519 | if (this->addralign_ < stub_template->alignment()) | |
2520 | this->addralign_ = stub_template->alignment(); | |
2521 | this->has_been_changed_ = true; | |
2522 | } | |
2523 | ||
2524 | template<bool big_endian> | |
2525 | void | |
2526 | Stub_table<big_endian>::relocate_stubs( | |
2527 | const Relocate_info<32, big_endian>* relinfo, | |
2528 | Target_arm<big_endian>* arm_target, | |
2529 | Output_section* output_section, | |
2530 | unsigned char* view, | |
2531 | Arm_address address, | |
2532 | section_size_type view_size) | |
2533 | { | |
2534 | // If we are passed a view bigger than the stub table's. we need to | |
2535 | // adjust the view. | |
2536 | gold_assert(address == this->address() | |
2537 | && (view_size | |
2538 | == static_cast<section_size_type>(this->data_size()))); | |
2539 | ||
2540 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
2541 | p != this->reloc_stubs_.end(); | |
2542 | ++p) | |
2543 | { | |
2544 | Reloc_stub* stub = p->second; | |
2545 | const Stub_template* stub_template = stub->stub_template(); | |
2546 | if (stub_template->reloc_count() != 0) | |
2547 | { | |
2548 | // Adjust view to cover the stub only. | |
2549 | section_size_type offset = stub->offset(); | |
2550 | section_size_type stub_size = stub_template->size(); | |
2551 | gold_assert(offset + stub_size <= view_size); | |
2552 | ||
2553 | arm_target->relocate_stub(stub, relinfo, output_section, | |
2554 | view + offset, address + offset, | |
2555 | stub_size); | |
2556 | } | |
2557 | } | |
2558 | } | |
2559 | ||
2560 | // Reset address and file offset. | |
2561 | ||
2562 | template<bool big_endian> | |
2563 | void | |
2564 | Stub_table<big_endian>::do_reset_address_and_file_offset() | |
2565 | { | |
2566 | off_t off = 0; | |
2567 | uint64_t max_addralign = 1; | |
2568 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
2569 | p != this->reloc_stubs_.end(); | |
2570 | ++p) | |
2571 | { | |
2572 | Reloc_stub* stub = p->second; | |
2573 | const Stub_template* stub_template = stub->stub_template(); | |
2574 | uint64_t stub_addralign = stub_template->alignment(); | |
2575 | max_addralign = std::max(max_addralign, stub_addralign); | |
2576 | off = align_address(off, stub_addralign); | |
2577 | stub->set_offset(off); | |
2578 | stub->reset_destination_address(); | |
2579 | off += stub_template->size(); | |
2580 | } | |
2581 | ||
2582 | this->addralign_ = max_addralign; | |
2583 | this->set_current_data_size_for_child(off); | |
2584 | } | |
2585 | ||
2586 | // Write out the stubs to file. | |
2587 | ||
2588 | template<bool big_endian> | |
2589 | void | |
2590 | Stub_table<big_endian>::do_write(Output_file* of) | |
2591 | { | |
2592 | off_t offset = this->offset(); | |
2593 | const section_size_type oview_size = | |
2594 | convert_to_section_size_type(this->data_size()); | |
2595 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
2596 | ||
2597 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
2598 | p != this->reloc_stubs_.end(); | |
2599 | ++p) | |
2600 | { | |
2601 | Reloc_stub* stub = p->second; | |
2602 | Arm_address address = this->address() + stub->offset(); | |
2603 | gold_assert(address | |
2604 | == align_address(address, | |
2605 | stub->stub_template()->alignment())); | |
2606 | stub->write(oview + stub->offset(), stub->stub_template()->size(), | |
2607 | big_endian); | |
2608 | } | |
2609 | of->write_output_view(this->offset(), oview_size, oview); | |
2610 | } | |
2611 | ||
10ad9fe5 DK |
2612 | // Arm_input_section methods. |
2613 | ||
2614 | // Initialize an Arm_input_section. | |
2615 | ||
2616 | template<bool big_endian> | |
2617 | void | |
2618 | Arm_input_section<big_endian>::init() | |
2619 | { | |
2620 | Relobj* relobj = this->relobj(); | |
2621 | unsigned int shndx = this->shndx(); | |
2622 | ||
2623 | // Cache these to speed up size and alignment queries. It is too slow | |
2624 | // to call section_addraglin and section_size every time. | |
2625 | this->original_addralign_ = relobj->section_addralign(shndx); | |
2626 | this->original_size_ = relobj->section_size(shndx); | |
2627 | ||
2628 | // We want to make this look like the original input section after | |
2629 | // output sections are finalized. | |
2630 | Output_section* os = relobj->output_section(shndx); | |
2631 | off_t offset = relobj->output_section_offset(shndx); | |
2632 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); | |
2633 | this->set_address(os->address() + offset); | |
2634 | this->set_file_offset(os->offset() + offset); | |
2635 | ||
2636 | this->set_current_data_size(this->original_size_); | |
2637 | this->finalize_data_size(); | |
2638 | } | |
2639 | ||
2640 | template<bool big_endian> | |
2641 | void | |
2642 | Arm_input_section<big_endian>::do_write(Output_file* of) | |
2643 | { | |
2644 | // We have to write out the original section content. | |
2645 | section_size_type section_size; | |
2646 | const unsigned char* section_contents = | |
2647 | this->relobj()->section_contents(this->shndx(), §ion_size, false); | |
2648 | of->write(this->offset(), section_contents, section_size); | |
2649 | ||
2650 | // If this owns a stub table and it is not empty, write it. | |
2651 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) | |
2652 | this->stub_table_->write(of); | |
2653 | } | |
2654 | ||
2655 | // Finalize data size. | |
2656 | ||
2657 | template<bool big_endian> | |
2658 | void | |
2659 | Arm_input_section<big_endian>::set_final_data_size() | |
2660 | { | |
2661 | // If this owns a stub table, finalize its data size as well. | |
2662 | if (this->is_stub_table_owner()) | |
2663 | { | |
2664 | uint64_t address = this->address(); | |
2665 | ||
2666 | // The stub table comes after the original section contents. | |
2667 | address += this->original_size_; | |
2668 | address = align_address(address, this->stub_table_->addralign()); | |
2669 | off_t offset = this->offset() + (address - this->address()); | |
2670 | this->stub_table_->set_address_and_file_offset(address, offset); | |
2671 | address += this->stub_table_->data_size(); | |
2672 | gold_assert(address == this->address() + this->current_data_size()); | |
2673 | } | |
2674 | ||
2675 | this->set_data_size(this->current_data_size()); | |
2676 | } | |
2677 | ||
2678 | // Reset address and file offset. | |
2679 | ||
2680 | template<bool big_endian> | |
2681 | void | |
2682 | Arm_input_section<big_endian>::do_reset_address_and_file_offset() | |
2683 | { | |
2684 | // Size of the original input section contents. | |
2685 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
2686 | ||
2687 | // If this is a stub table owner, account for the stub table size. | |
2688 | if (this->is_stub_table_owner()) | |
2689 | { | |
2690 | Stub_table<big_endian>* stub_table = this->stub_table_; | |
2691 | ||
2692 | // Reset the stub table's address and file offset. The | |
2693 | // current data size for child will be updated after that. | |
2694 | stub_table_->reset_address_and_file_offset(); | |
2695 | off = align_address(off, stub_table_->addralign()); | |
2696 | off += stub_table->current_data_size(); | |
2697 | } | |
2698 | ||
2699 | this->set_current_data_size(off); | |
2700 | } | |
2701 | ||
07f508a2 DK |
2702 | // Arm_output_section methods. |
2703 | ||
2704 | // Create a stub group for input sections from BEGIN to END. OWNER | |
2705 | // points to the input section to be the owner a new stub table. | |
2706 | ||
2707 | template<bool big_endian> | |
2708 | void | |
2709 | Arm_output_section<big_endian>::create_stub_group( | |
2710 | Input_section_list::const_iterator begin, | |
2711 | Input_section_list::const_iterator end, | |
2712 | Input_section_list::const_iterator owner, | |
2713 | Target_arm<big_endian>* target, | |
2714 | std::vector<Output_relaxed_input_section*>* new_relaxed_sections) | |
2715 | { | |
2716 | // Currently we convert ordinary input sections into relaxed sections only | |
2717 | // at this point but we may want to support creating relaxed input section | |
2718 | // very early. So we check here to see if owner is already a relaxed | |
2719 | // section. | |
2720 | ||
2721 | Arm_input_section<big_endian>* arm_input_section; | |
2722 | if (owner->is_relaxed_input_section()) | |
2723 | { | |
2724 | arm_input_section = | |
2725 | Arm_input_section<big_endian>::as_arm_input_section( | |
2726 | owner->relaxed_input_section()); | |
2727 | } | |
2728 | else | |
2729 | { | |
2730 | gold_assert(owner->is_input_section()); | |
2731 | // Create a new relaxed input section. | |
2732 | arm_input_section = | |
2733 | target->new_arm_input_section(owner->relobj(), owner->shndx()); | |
2734 | new_relaxed_sections->push_back(arm_input_section); | |
2735 | } | |
2736 | ||
2737 | // Create a stub table. | |
2738 | Stub_table<big_endian>* stub_table = | |
2739 | target->new_stub_table(arm_input_section); | |
2740 | ||
2741 | arm_input_section->set_stub_table(stub_table); | |
2742 | ||
2743 | Input_section_list::const_iterator p = begin; | |
2744 | Input_section_list::const_iterator prev_p; | |
2745 | ||
2746 | // Look for input sections or relaxed input sections in [begin ... end]. | |
2747 | do | |
2748 | { | |
2749 | if (p->is_input_section() || p->is_relaxed_input_section()) | |
2750 | { | |
2751 | // The stub table information for input sections live | |
2752 | // in their objects. | |
2753 | Arm_relobj<big_endian>* arm_relobj = | |
2754 | Arm_relobj<big_endian>::as_arm_relobj(p->relobj()); | |
2755 | arm_relobj->set_stub_table(p->shndx(), stub_table); | |
2756 | } | |
2757 | prev_p = p++; | |
2758 | } | |
2759 | while (prev_p != end); | |
2760 | } | |
2761 | ||
2762 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit | |
2763 | // of stub groups. We grow a stub group by adding input section until the | |
2764 | // size is just below GROUP_SIZE. The last input section will be converted | |
2765 | // into a stub table. If STUB_ALWAYS_AFTER_BRANCH is false, we also add | |
2766 | // input section after the stub table, effectively double the group size. | |
2767 | // | |
2768 | // This is similar to the group_sections() function in elf32-arm.c but is | |
2769 | // implemented differently. | |
2770 | ||
2771 | template<bool big_endian> | |
2772 | void | |
2773 | Arm_output_section<big_endian>::group_sections( | |
2774 | section_size_type group_size, | |
2775 | bool stubs_always_after_branch, | |
2776 | Target_arm<big_endian>* target) | |
2777 | { | |
2778 | // We only care about sections containing code. | |
2779 | if ((this->flags() & elfcpp::SHF_EXECINSTR) == 0) | |
2780 | return; | |
2781 | ||
2782 | // States for grouping. | |
2783 | typedef enum | |
2784 | { | |
2785 | // No group is being built. | |
2786 | NO_GROUP, | |
2787 | // A group is being built but the stub table is not found yet. | |
2788 | // We keep group a stub group until the size is just under GROUP_SIZE. | |
2789 | // The last input section in the group will be used as the stub table. | |
2790 | FINDING_STUB_SECTION, | |
2791 | // A group is being built and we have already found a stub table. | |
2792 | // We enter this state to grow a stub group by adding input section | |
2793 | // after the stub table. This effectively doubles the group size. | |
2794 | HAS_STUB_SECTION | |
2795 | } State; | |
2796 | ||
2797 | // Any newly created relaxed sections are stored here. | |
2798 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; | |
2799 | ||
2800 | State state = NO_GROUP; | |
2801 | section_size_type off = 0; | |
2802 | section_size_type group_begin_offset = 0; | |
2803 | section_size_type group_end_offset = 0; | |
2804 | section_size_type stub_table_end_offset = 0; | |
2805 | Input_section_list::const_iterator group_begin = | |
2806 | this->input_sections().end(); | |
2807 | Input_section_list::const_iterator stub_table = | |
2808 | this->input_sections().end(); | |
2809 | Input_section_list::const_iterator group_end = this->input_sections().end(); | |
2810 | for (Input_section_list::const_iterator p = this->input_sections().begin(); | |
2811 | p != this->input_sections().end(); | |
2812 | ++p) | |
2813 | { | |
2814 | section_size_type section_begin_offset = | |
2815 | align_address(off, p->addralign()); | |
2816 | section_size_type section_end_offset = | |
2817 | section_begin_offset + p->data_size(); | |
2818 | ||
2819 | // Check to see if we should group the previously seens sections. | |
2820 | switch(state) | |
2821 | { | |
2822 | case NO_GROUP: | |
2823 | break; | |
2824 | ||
2825 | case FINDING_STUB_SECTION: | |
2826 | // Adding this section makes the group larger than GROUP_SIZE. | |
2827 | if (section_end_offset - group_begin_offset >= group_size) | |
2828 | { | |
2829 | if (stubs_always_after_branch) | |
2830 | { | |
2831 | gold_assert(group_end != this->input_sections().end()); | |
2832 | this->create_stub_group(group_begin, group_end, group_end, | |
2833 | target, &new_relaxed_sections); | |
2834 | state = NO_GROUP; | |
2835 | } | |
2836 | else | |
2837 | { | |
2838 | // But wait, there's more! Input sections up to | |
2839 | // stub_group_size bytes after the stub table can be | |
2840 | // handled by it too. | |
2841 | state = HAS_STUB_SECTION; | |
2842 | stub_table = group_end; | |
2843 | stub_table_end_offset = group_end_offset; | |
2844 | } | |
2845 | } | |
2846 | break; | |
2847 | ||
2848 | case HAS_STUB_SECTION: | |
2849 | // Adding this section makes the post stub-section group larger | |
2850 | // than GROUP_SIZE. | |
2851 | if (section_end_offset - stub_table_end_offset >= group_size) | |
2852 | { | |
2853 | gold_assert(group_end != this->input_sections().end()); | |
2854 | this->create_stub_group(group_begin, group_end, stub_table, | |
2855 | target, &new_relaxed_sections); | |
2856 | state = NO_GROUP; | |
2857 | } | |
2858 | break; | |
2859 | ||
2860 | default: | |
2861 | gold_unreachable(); | |
2862 | } | |
2863 | ||
2864 | // If we see an input section and currently there is no group, start | |
2865 | // a new one. Skip any empty sections. | |
2866 | if ((p->is_input_section() || p->is_relaxed_input_section()) | |
2867 | && (p->relobj()->section_size(p->shndx()) != 0)) | |
2868 | { | |
2869 | if (state == NO_GROUP) | |
2870 | { | |
2871 | state = FINDING_STUB_SECTION; | |
2872 | group_begin = p; | |
2873 | group_begin_offset = section_begin_offset; | |
2874 | } | |
2875 | ||
2876 | // Keep track of the last input section seen. | |
2877 | group_end = p; | |
2878 | group_end_offset = section_end_offset; | |
2879 | } | |
2880 | ||
2881 | off = section_end_offset; | |
2882 | } | |
2883 | ||
2884 | // Create a stub group for any ungrouped sections. | |
2885 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) | |
2886 | { | |
2887 | gold_assert(group_end != this->input_sections().end()); | |
2888 | this->create_stub_group(group_begin, group_end, | |
2889 | (state == FINDING_STUB_SECTION | |
2890 | ? group_end | |
2891 | : stub_table), | |
2892 | target, &new_relaxed_sections); | |
2893 | } | |
2894 | ||
2895 | // Convert input section into relaxed input section in a batch. | |
2896 | if (!new_relaxed_sections.empty()) | |
2897 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); | |
2898 | ||
2899 | // Update the section offsets | |
2900 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) | |
2901 | { | |
2902 | Arm_relobj<big_endian>* arm_relobj = | |
2903 | Arm_relobj<big_endian>::as_arm_relobj( | |
2904 | new_relaxed_sections[i]->relobj()); | |
2905 | unsigned int shndx = new_relaxed_sections[i]->shndx(); | |
2906 | // Tell Arm_relobj that this input section is converted. | |
2907 | arm_relobj->convert_input_section_to_relaxed_section(shndx); | |
2908 | } | |
2909 | } | |
2910 | ||
94cdfcff DK |
2911 | // A class to handle the PLT data. |
2912 | ||
2913 | template<bool big_endian> | |
2914 | class Output_data_plt_arm : public Output_section_data | |
2915 | { | |
2916 | public: | |
2917 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
2918 | Reloc_section; | |
2919 | ||
2920 | Output_data_plt_arm(Layout*, Output_data_space*); | |
2921 | ||
2922 | // Add an entry to the PLT. | |
2923 | void | |
2924 | add_entry(Symbol* gsym); | |
2925 | ||
2926 | // Return the .rel.plt section data. | |
2927 | const Reloc_section* | |
2928 | rel_plt() const | |
2929 | { return this->rel_; } | |
2930 | ||
2931 | protected: | |
2932 | void | |
2933 | do_adjust_output_section(Output_section* os); | |
2934 | ||
2935 | // Write to a map file. | |
2936 | void | |
2937 | do_print_to_mapfile(Mapfile* mapfile) const | |
2938 | { mapfile->print_output_data(this, _("** PLT")); } | |
2939 | ||
2940 | private: | |
2941 | // Template for the first PLT entry. | |
2942 | static const uint32_t first_plt_entry[5]; | |
2943 | ||
2944 | // Template for subsequent PLT entries. | |
2945 | static const uint32_t plt_entry[3]; | |
2946 | ||
2947 | // Set the final size. | |
2948 | void | |
2949 | set_final_data_size() | |
2950 | { | |
2951 | this->set_data_size(sizeof(first_plt_entry) | |
2952 | + this->count_ * sizeof(plt_entry)); | |
2953 | } | |
2954 | ||
2955 | // Write out the PLT data. | |
2956 | void | |
2957 | do_write(Output_file*); | |
2958 | ||
2959 | // The reloc section. | |
2960 | Reloc_section* rel_; | |
2961 | // The .got.plt section. | |
2962 | Output_data_space* got_plt_; | |
2963 | // The number of PLT entries. | |
2964 | unsigned int count_; | |
2965 | }; | |
2966 | ||
2967 | // Create the PLT section. The ordinary .got section is an argument, | |
2968 | // since we need to refer to the start. We also create our own .got | |
2969 | // section just for PLT entries. | |
2970 | ||
2971 | template<bool big_endian> | |
2972 | Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout, | |
2973 | Output_data_space* got_plt) | |
2974 | : Output_section_data(4), got_plt_(got_plt), count_(0) | |
2975 | { | |
2976 | this->rel_ = new Reloc_section(false); | |
2977 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, | |
2978 | elfcpp::SHF_ALLOC, this->rel_); | |
2979 | } | |
2980 | ||
2981 | template<bool big_endian> | |
2982 | void | |
2983 | Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os) | |
2984 | { | |
2985 | os->set_entsize(0); | |
2986 | } | |
2987 | ||
2988 | // Add an entry to the PLT. | |
2989 | ||
2990 | template<bool big_endian> | |
2991 | void | |
2992 | Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym) | |
2993 | { | |
2994 | gold_assert(!gsym->has_plt_offset()); | |
2995 | ||
2996 | // Note that when setting the PLT offset we skip the initial | |
2997 | // reserved PLT entry. | |
2998 | gsym->set_plt_offset((this->count_) * sizeof(plt_entry) | |
2999 | + sizeof(first_plt_entry)); | |
3000 | ||
3001 | ++this->count_; | |
3002 | ||
3003 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
3004 | ||
3005 | // Every PLT entry needs a GOT entry which points back to the PLT | |
3006 | // entry (this will be changed by the dynamic linker, normally | |
3007 | // lazily when the function is called). | |
3008 | this->got_plt_->set_current_data_size(got_offset + 4); | |
3009 | ||
3010 | // Every PLT entry needs a reloc. | |
3011 | gsym->set_needs_dynsym_entry(); | |
3012 | this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_, | |
3013 | got_offset); | |
3014 | ||
3015 | // Note that we don't need to save the symbol. The contents of the | |
3016 | // PLT are independent of which symbols are used. The symbols only | |
3017 | // appear in the relocations. | |
3018 | } | |
3019 | ||
3020 | // ARM PLTs. | |
3021 | // FIXME: This is not very flexible. Right now this has only been tested | |
3022 | // on armv5te. If we are to support additional architecture features like | |
3023 | // Thumb-2 or BE8, we need to make this more flexible like GNU ld. | |
3024 | ||
3025 | // The first entry in the PLT. | |
3026 | template<bool big_endian> | |
3027 | const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] = | |
3028 | { | |
3029 | 0xe52de004, // str lr, [sp, #-4]! | |
3030 | 0xe59fe004, // ldr lr, [pc, #4] | |
3031 | 0xe08fe00e, // add lr, pc, lr | |
3032 | 0xe5bef008, // ldr pc, [lr, #8]! | |
3033 | 0x00000000, // &GOT[0] - . | |
3034 | }; | |
3035 | ||
3036 | // Subsequent entries in the PLT. | |
3037 | ||
3038 | template<bool big_endian> | |
3039 | const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] = | |
3040 | { | |
3041 | 0xe28fc600, // add ip, pc, #0xNN00000 | |
3042 | 0xe28cca00, // add ip, ip, #0xNN000 | |
3043 | 0xe5bcf000, // ldr pc, [ip, #0xNNN]! | |
3044 | }; | |
3045 | ||
3046 | // Write out the PLT. This uses the hand-coded instructions above, | |
3047 | // and adjusts them as needed. This is all specified by the arm ELF | |
3048 | // Processor Supplement. | |
3049 | ||
3050 | template<bool big_endian> | |
3051 | void | |
3052 | Output_data_plt_arm<big_endian>::do_write(Output_file* of) | |
3053 | { | |
3054 | const off_t offset = this->offset(); | |
3055 | const section_size_type oview_size = | |
3056 | convert_to_section_size_type(this->data_size()); | |
3057 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
3058 | ||
3059 | const off_t got_file_offset = this->got_plt_->offset(); | |
3060 | const section_size_type got_size = | |
3061 | convert_to_section_size_type(this->got_plt_->data_size()); | |
3062 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
3063 | got_size); | |
3064 | unsigned char* pov = oview; | |
3065 | ||
3066 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
3067 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
3068 | ||
3069 | // Write first PLT entry. All but the last word are constants. | |
3070 | const size_t num_first_plt_words = (sizeof(first_plt_entry) | |
3071 | / sizeof(plt_entry[0])); | |
3072 | for (size_t i = 0; i < num_first_plt_words - 1; i++) | |
3073 | elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]); | |
3074 | // Last word in first PLT entry is &GOT[0] - . | |
3075 | elfcpp::Swap<32, big_endian>::writeval(pov + 16, | |
3076 | got_address - (plt_address + 16)); | |
3077 | pov += sizeof(first_plt_entry); | |
3078 | ||
3079 | unsigned char* got_pov = got_view; | |
3080 | ||
3081 | memset(got_pov, 0, 12); | |
3082 | got_pov += 12; | |
3083 | ||
3084 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
3085 | unsigned int plt_offset = sizeof(first_plt_entry); | |
3086 | unsigned int plt_rel_offset = 0; | |
3087 | unsigned int got_offset = 12; | |
3088 | const unsigned int count = this->count_; | |
3089 | for (unsigned int i = 0; | |
3090 | i < count; | |
3091 | ++i, | |
3092 | pov += sizeof(plt_entry), | |
3093 | got_pov += 4, | |
3094 | plt_offset += sizeof(plt_entry), | |
3095 | plt_rel_offset += rel_size, | |
3096 | got_offset += 4) | |
3097 | { | |
3098 | // Set and adjust the PLT entry itself. | |
3099 | int32_t offset = ((got_address + got_offset) | |
3100 | - (plt_address + plt_offset + 8)); | |
3101 | ||
3102 | gold_assert(offset >= 0 && offset < 0x0fffffff); | |
3103 | uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff); | |
3104 | elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0); | |
3105 | uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff); | |
3106 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1); | |
3107 | uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff); | |
3108 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2); | |
3109 | ||
3110 | // Set the entry in the GOT. | |
3111 | elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address); | |
3112 | } | |
3113 | ||
3114 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
3115 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
3116 | ||
3117 | of->write_output_view(offset, oview_size, oview); | |
3118 | of->write_output_view(got_file_offset, got_size, got_view); | |
3119 | } | |
3120 | ||
3121 | // Create a PLT entry for a global symbol. | |
3122 | ||
3123 | template<bool big_endian> | |
3124 | void | |
3125 | Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
3126 | Symbol* gsym) | |
3127 | { | |
3128 | if (gsym->has_plt_offset()) | |
3129 | return; | |
3130 | ||
3131 | if (this->plt_ == NULL) | |
3132 | { | |
3133 | // Create the GOT sections first. | |
3134 | this->got_section(symtab, layout); | |
3135 | ||
3136 | this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_); | |
3137 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
3138 | (elfcpp::SHF_ALLOC | |
3139 | | elfcpp::SHF_EXECINSTR), | |
3140 | this->plt_); | |
3141 | } | |
3142 | this->plt_->add_entry(gsym); | |
3143 | } | |
3144 | ||
4a657b0d DK |
3145 | // Report an unsupported relocation against a local symbol. |
3146 | ||
3147 | template<bool big_endian> | |
3148 | void | |
3149 | Target_arm<big_endian>::Scan::unsupported_reloc_local( | |
3150 | Sized_relobj<32, big_endian>* object, | |
3151 | unsigned int r_type) | |
3152 | { | |
3153 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
3154 | object->name().c_str(), r_type); | |
3155 | } | |
3156 | ||
bec53400 DK |
3157 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
3158 | // dynamic linker does not support it, issue an error. The GNU linker | |
3159 | // only issues a non-PIC error for an allocated read-only section. | |
3160 | // Here we know the section is allocated, but we don't know that it is | |
3161 | // read-only. But we check for all the relocation types which the | |
3162 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
3163 | // error even if the section is not read-only. | |
3164 | ||
3165 | template<bool big_endian> | |
3166 | void | |
3167 | Target_arm<big_endian>::Scan::check_non_pic(Relobj* object, | |
3168 | unsigned int r_type) | |
3169 | { | |
3170 | switch (r_type) | |
3171 | { | |
3172 | // These are the relocation types supported by glibc for ARM. | |
3173 | case elfcpp::R_ARM_RELATIVE: | |
3174 | case elfcpp::R_ARM_COPY: | |
3175 | case elfcpp::R_ARM_GLOB_DAT: | |
3176 | case elfcpp::R_ARM_JUMP_SLOT: | |
3177 | case elfcpp::R_ARM_ABS32: | |
be8fcb75 | 3178 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
3179 | case elfcpp::R_ARM_PC24: |
3180 | // FIXME: The following 3 types are not supported by Android's dynamic | |
3181 | // linker. | |
3182 | case elfcpp::R_ARM_TLS_DTPMOD32: | |
3183 | case elfcpp::R_ARM_TLS_DTPOFF32: | |
3184 | case elfcpp::R_ARM_TLS_TPOFF32: | |
3185 | return; | |
3186 | ||
3187 | default: | |
3188 | // This prevents us from issuing more than one error per reloc | |
3189 | // section. But we can still wind up issuing more than one | |
3190 | // error per object file. | |
3191 | if (this->issued_non_pic_error_) | |
3192 | return; | |
3193 | object->error(_("requires unsupported dynamic reloc; " | |
3194 | "recompile with -fPIC")); | |
3195 | this->issued_non_pic_error_ = true; | |
3196 | return; | |
3197 | ||
3198 | case elfcpp::R_ARM_NONE: | |
3199 | gold_unreachable(); | |
3200 | } | |
3201 | } | |
3202 | ||
4a657b0d | 3203 | // Scan a relocation for a local symbol. |
bec53400 DK |
3204 | // FIXME: This only handles a subset of relocation types used by Android |
3205 | // on ARM v5te devices. | |
4a657b0d DK |
3206 | |
3207 | template<bool big_endian> | |
3208 | inline void | |
3209 | Target_arm<big_endian>::Scan::local(const General_options&, | |
bec53400 DK |
3210 | Symbol_table* symtab, |
3211 | Layout* layout, | |
3212 | Target_arm* target, | |
4a657b0d | 3213 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
3214 | unsigned int data_shndx, |
3215 | Output_section* output_section, | |
3216 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
3217 | unsigned int r_type, |
3218 | const elfcpp::Sym<32, big_endian>&) | |
3219 | { | |
3220 | r_type = get_real_reloc_type(r_type); | |
3221 | switch (r_type) | |
3222 | { | |
3223 | case elfcpp::R_ARM_NONE: | |
3224 | break; | |
3225 | ||
bec53400 | 3226 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 3227 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
3228 | // If building a shared library (or a position-independent |
3229 | // executable), we need to create a dynamic relocation for | |
3230 | // this location. The relocation applied at link time will | |
3231 | // apply the link-time value, so we flag the location with | |
3232 | // an R_ARM_RELATIVE relocation so the dynamic loader can | |
3233 | // relocate it easily. | |
3234 | if (parameters->options().output_is_position_independent()) | |
3235 | { | |
3236 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3237 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
3238 | // If we are to add more other reloc types than R_ARM_ABS32, | |
3239 | // we need to add check_non_pic(object, r_type) here. | |
3240 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE, | |
3241 | output_section, data_shndx, | |
3242 | reloc.get_r_offset()); | |
3243 | } | |
3244 | break; | |
3245 | ||
3246 | case elfcpp::R_ARM_REL32: | |
3247 | case elfcpp::R_ARM_THM_CALL: | |
3248 | case elfcpp::R_ARM_CALL: | |
3249 | case elfcpp::R_ARM_PREL31: | |
3250 | case elfcpp::R_ARM_JUMP24: | |
3251 | case elfcpp::R_ARM_PLT32: | |
be8fcb75 ILT |
3252 | case elfcpp::R_ARM_THM_ABS5: |
3253 | case elfcpp::R_ARM_ABS8: | |
3254 | case elfcpp::R_ARM_ABS12: | |
3255 | case elfcpp::R_ARM_ABS16: | |
3256 | case elfcpp::R_ARM_BASE_ABS: | |
fd3c5f0b ILT |
3257 | case elfcpp::R_ARM_MOVW_ABS_NC: |
3258 | case elfcpp::R_ARM_MOVT_ABS: | |
3259 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
3260 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
3261 | case elfcpp::R_ARM_MOVW_PREL_NC: |
3262 | case elfcpp::R_ARM_MOVT_PREL: | |
3263 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
3264 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
bec53400 DK |
3265 | break; |
3266 | ||
3267 | case elfcpp::R_ARM_GOTOFF32: | |
3268 | // We need a GOT section: | |
3269 | target->got_section(symtab, layout); | |
3270 | break; | |
3271 | ||
3272 | case elfcpp::R_ARM_BASE_PREL: | |
3273 | // FIXME: What about this? | |
3274 | break; | |
3275 | ||
3276 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 3277 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
3278 | { |
3279 | // The symbol requires a GOT entry. | |
3280 | Output_data_got<32, big_endian>* got = | |
3281 | target->got_section(symtab, layout); | |
3282 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
3283 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) | |
3284 | { | |
3285 | // If we are generating a shared object, we need to add a | |
3286 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
3287 | if (parameters->options().output_is_position_independent()) | |
3288 | { | |
3289 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3290 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
3291 | rel_dyn->add_local_relative( | |
3292 | object, r_sym, elfcpp::R_ARM_RELATIVE, got, | |
3293 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3294 | } | |
3295 | } | |
3296 | } | |
3297 | break; | |
3298 | ||
3299 | case elfcpp::R_ARM_TARGET1: | |
3300 | // This should have been mapped to another type already. | |
3301 | // Fall through. | |
3302 | case elfcpp::R_ARM_COPY: | |
3303 | case elfcpp::R_ARM_GLOB_DAT: | |
3304 | case elfcpp::R_ARM_JUMP_SLOT: | |
3305 | case elfcpp::R_ARM_RELATIVE: | |
3306 | // These are relocations which should only be seen by the | |
3307 | // dynamic linker, and should never be seen here. | |
3308 | gold_error(_("%s: unexpected reloc %u in object file"), | |
3309 | object->name().c_str(), r_type); | |
3310 | break; | |
3311 | ||
4a657b0d DK |
3312 | default: |
3313 | unsupported_reloc_local(object, r_type); | |
3314 | break; | |
3315 | } | |
3316 | } | |
3317 | ||
3318 | // Report an unsupported relocation against a global symbol. | |
3319 | ||
3320 | template<bool big_endian> | |
3321 | void | |
3322 | Target_arm<big_endian>::Scan::unsupported_reloc_global( | |
3323 | Sized_relobj<32, big_endian>* object, | |
3324 | unsigned int r_type, | |
3325 | Symbol* gsym) | |
3326 | { | |
3327 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
3328 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
3329 | } | |
3330 | ||
3331 | // Scan a relocation for a global symbol. | |
bec53400 DK |
3332 | // FIXME: This only handles a subset of relocation types used by Android |
3333 | // on ARM v5te devices. | |
4a657b0d DK |
3334 | |
3335 | template<bool big_endian> | |
3336 | inline void | |
3337 | Target_arm<big_endian>::Scan::global(const General_options&, | |
bec53400 DK |
3338 | Symbol_table* symtab, |
3339 | Layout* layout, | |
3340 | Target_arm* target, | |
4a657b0d | 3341 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
3342 | unsigned int data_shndx, |
3343 | Output_section* output_section, | |
3344 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
3345 | unsigned int r_type, |
3346 | Symbol* gsym) | |
3347 | { | |
3348 | r_type = get_real_reloc_type(r_type); | |
3349 | switch (r_type) | |
3350 | { | |
3351 | case elfcpp::R_ARM_NONE: | |
3352 | break; | |
3353 | ||
bec53400 | 3354 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 3355 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
3356 | { |
3357 | // Make a dynamic relocation if necessary. | |
3358 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) | |
3359 | { | |
3360 | if (target->may_need_copy_reloc(gsym)) | |
3361 | { | |
3362 | target->copy_reloc(symtab, layout, object, | |
3363 | data_shndx, output_section, gsym, reloc); | |
3364 | } | |
3365 | else if (gsym->can_use_relative_reloc(false)) | |
3366 | { | |
3367 | // If we are to add more other reloc types than R_ARM_ABS32, | |
3368 | // we need to add check_non_pic(object, r_type) here. | |
3369 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3370 | rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE, | |
3371 | output_section, object, | |
3372 | data_shndx, reloc.get_r_offset()); | |
3373 | } | |
3374 | else | |
3375 | { | |
3376 | // If we are to add more other reloc types than R_ARM_ABS32, | |
3377 | // we need to add check_non_pic(object, r_type) here. | |
3378 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3379 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
3380 | data_shndx, reloc.get_r_offset()); | |
3381 | } | |
3382 | } | |
3383 | } | |
3384 | break; | |
3385 | ||
fd3c5f0b ILT |
3386 | case elfcpp::R_ARM_MOVW_ABS_NC: |
3387 | case elfcpp::R_ARM_MOVT_ABS: | |
3388 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
3389 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
3390 | case elfcpp::R_ARM_MOVW_PREL_NC: |
3391 | case elfcpp::R_ARM_MOVT_PREL: | |
3392 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
3393 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
fd3c5f0b ILT |
3394 | break; |
3395 | ||
be8fcb75 ILT |
3396 | case elfcpp::R_ARM_THM_ABS5: |
3397 | case elfcpp::R_ARM_ABS8: | |
3398 | case elfcpp::R_ARM_ABS12: | |
3399 | case elfcpp::R_ARM_ABS16: | |
3400 | case elfcpp::R_ARM_BASE_ABS: | |
3401 | { | |
3402 | // No dynamic relocs of this kinds. | |
3403 | // Report the error in case of PIC. | |
3404 | int flags = Symbol::NON_PIC_REF; | |
3405 | if (gsym->type() == elfcpp::STT_FUNC | |
3406 | || gsym->type() == elfcpp::STT_ARM_TFUNC) | |
3407 | flags |= Symbol::FUNCTION_CALL; | |
3408 | if (gsym->needs_dynamic_reloc(flags)) | |
3409 | check_non_pic(object, r_type); | |
3410 | } | |
3411 | break; | |
3412 | ||
bec53400 DK |
3413 | case elfcpp::R_ARM_REL32: |
3414 | case elfcpp::R_ARM_PREL31: | |
3415 | { | |
3416 | // Make a dynamic relocation if necessary. | |
3417 | int flags = Symbol::NON_PIC_REF; | |
3418 | if (gsym->needs_dynamic_reloc(flags)) | |
3419 | { | |
3420 | if (target->may_need_copy_reloc(gsym)) | |
3421 | { | |
3422 | target->copy_reloc(symtab, layout, object, | |
3423 | data_shndx, output_section, gsym, reloc); | |
3424 | } | |
3425 | else | |
3426 | { | |
3427 | check_non_pic(object, r_type); | |
3428 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3429 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
3430 | data_shndx, reloc.get_r_offset()); | |
3431 | } | |
3432 | } | |
3433 | } | |
3434 | break; | |
3435 | ||
3436 | case elfcpp::R_ARM_JUMP24: | |
3437 | case elfcpp::R_ARM_THM_CALL: | |
3438 | case elfcpp::R_ARM_CALL: | |
3439 | { | |
3440 | if (Target_arm<big_endian>::Scan::symbol_needs_plt_entry(gsym)) | |
3441 | target->make_plt_entry(symtab, layout, gsym); | |
3442 | // Make a dynamic relocation if necessary. | |
3443 | int flags = Symbol::NON_PIC_REF; | |
3444 | if (gsym->type() == elfcpp::STT_FUNC | |
07800fab | 3445 | || gsym->type() == elfcpp::STT_ARM_TFUNC) |
bec53400 DK |
3446 | flags |= Symbol::FUNCTION_CALL; |
3447 | if (gsym->needs_dynamic_reloc(flags)) | |
3448 | { | |
3449 | if (target->may_need_copy_reloc(gsym)) | |
3450 | { | |
3451 | target->copy_reloc(symtab, layout, object, | |
3452 | data_shndx, output_section, gsym, | |
3453 | reloc); | |
3454 | } | |
3455 | else | |
3456 | { | |
3457 | check_non_pic(object, r_type); | |
3458 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3459 | rel_dyn->add_global(gsym, r_type, output_section, object, | |
3460 | data_shndx, reloc.get_r_offset()); | |
3461 | } | |
3462 | } | |
3463 | } | |
3464 | break; | |
3465 | ||
3466 | case elfcpp::R_ARM_PLT32: | |
3467 | // If the symbol is fully resolved, this is just a relative | |
3468 | // local reloc. Otherwise we need a PLT entry. | |
3469 | if (gsym->final_value_is_known()) | |
3470 | break; | |
3471 | // If building a shared library, we can also skip the PLT entry | |
3472 | // if the symbol is defined in the output file and is protected | |
3473 | // or hidden. | |
3474 | if (gsym->is_defined() | |
3475 | && !gsym->is_from_dynobj() | |
3476 | && !gsym->is_preemptible()) | |
3477 | break; | |
3478 | target->make_plt_entry(symtab, layout, gsym); | |
3479 | break; | |
3480 | ||
3481 | case elfcpp::R_ARM_GOTOFF32: | |
3482 | // We need a GOT section. | |
3483 | target->got_section(symtab, layout); | |
3484 | break; | |
3485 | ||
3486 | case elfcpp::R_ARM_BASE_PREL: | |
3487 | // FIXME: What about this? | |
3488 | break; | |
3489 | ||
3490 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 3491 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
3492 | { |
3493 | // The symbol requires a GOT entry. | |
3494 | Output_data_got<32, big_endian>* got = | |
3495 | target->got_section(symtab, layout); | |
3496 | if (gsym->final_value_is_known()) | |
3497 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
3498 | else | |
3499 | { | |
3500 | // If this symbol is not fully resolved, we need to add a | |
3501 | // GOT entry with a dynamic relocation. | |
3502 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); | |
3503 | if (gsym->is_from_dynobj() | |
3504 | || gsym->is_undefined() | |
3505 | || gsym->is_preemptible()) | |
3506 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, | |
3507 | rel_dyn, elfcpp::R_ARM_GLOB_DAT); | |
3508 | else | |
3509 | { | |
3510 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) | |
3511 | rel_dyn->add_global_relative( | |
3512 | gsym, elfcpp::R_ARM_RELATIVE, got, | |
3513 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
3514 | } | |
3515 | } | |
3516 | } | |
3517 | break; | |
3518 | ||
3519 | case elfcpp::R_ARM_TARGET1: | |
3520 | // This should have been mapped to another type already. | |
3521 | // Fall through. | |
3522 | case elfcpp::R_ARM_COPY: | |
3523 | case elfcpp::R_ARM_GLOB_DAT: | |
3524 | case elfcpp::R_ARM_JUMP_SLOT: | |
3525 | case elfcpp::R_ARM_RELATIVE: | |
3526 | // These are relocations which should only be seen by the | |
3527 | // dynamic linker, and should never be seen here. | |
3528 | gold_error(_("%s: unexpected reloc %u in object file"), | |
3529 | object->name().c_str(), r_type); | |
3530 | break; | |
3531 | ||
4a657b0d DK |
3532 | default: |
3533 | unsupported_reloc_global(object, r_type, gsym); | |
3534 | break; | |
3535 | } | |
3536 | } | |
3537 | ||
3538 | // Process relocations for gc. | |
3539 | ||
3540 | template<bool big_endian> | |
3541 | void | |
3542 | Target_arm<big_endian>::gc_process_relocs(const General_options& options, | |
3543 | Symbol_table* symtab, | |
3544 | Layout* layout, | |
3545 | Sized_relobj<32, big_endian>* object, | |
3546 | unsigned int data_shndx, | |
3547 | unsigned int, | |
3548 | const unsigned char* prelocs, | |
3549 | size_t reloc_count, | |
3550 | Output_section* output_section, | |
3551 | bool needs_special_offset_handling, | |
3552 | size_t local_symbol_count, | |
3553 | const unsigned char* plocal_symbols) | |
3554 | { | |
3555 | typedef Target_arm<big_endian> Arm; | |
3556 | typedef typename Target_arm<big_endian>::Scan Scan; | |
3557 | ||
3558 | gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>( | |
3559 | options, | |
3560 | symtab, | |
3561 | layout, | |
3562 | this, | |
3563 | object, | |
3564 | data_shndx, | |
3565 | prelocs, | |
3566 | reloc_count, | |
3567 | output_section, | |
3568 | needs_special_offset_handling, | |
3569 | local_symbol_count, | |
3570 | plocal_symbols); | |
3571 | } | |
3572 | ||
3573 | // Scan relocations for a section. | |
3574 | ||
3575 | template<bool big_endian> | |
3576 | void | |
3577 | Target_arm<big_endian>::scan_relocs(const General_options& options, | |
3578 | Symbol_table* symtab, | |
3579 | Layout* layout, | |
3580 | Sized_relobj<32, big_endian>* object, | |
3581 | unsigned int data_shndx, | |
3582 | unsigned int sh_type, | |
3583 | const unsigned char* prelocs, | |
3584 | size_t reloc_count, | |
3585 | Output_section* output_section, | |
3586 | bool needs_special_offset_handling, | |
3587 | size_t local_symbol_count, | |
3588 | const unsigned char* plocal_symbols) | |
3589 | { | |
3590 | typedef typename Target_arm<big_endian>::Scan Scan; | |
3591 | if (sh_type == elfcpp::SHT_RELA) | |
3592 | { | |
3593 | gold_error(_("%s: unsupported RELA reloc section"), | |
3594 | object->name().c_str()); | |
3595 | return; | |
3596 | } | |
3597 | ||
3598 | gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>( | |
3599 | options, | |
3600 | symtab, | |
3601 | layout, | |
3602 | this, | |
3603 | object, | |
3604 | data_shndx, | |
3605 | prelocs, | |
3606 | reloc_count, | |
3607 | output_section, | |
3608 | needs_special_offset_handling, | |
3609 | local_symbol_count, | |
3610 | plocal_symbols); | |
3611 | } | |
3612 | ||
3613 | // Finalize the sections. | |
3614 | ||
3615 | template<bool big_endian> | |
3616 | void | |
94cdfcff | 3617 | Target_arm<big_endian>::do_finalize_sections(Layout* layout) |
4a657b0d | 3618 | { |
94cdfcff DK |
3619 | // Fill in some more dynamic tags. |
3620 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
3621 | if (odyn != NULL) | |
3622 | { | |
3623 | if (this->got_plt_ != NULL) | |
3624 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
3625 | ||
3626 | if (this->plt_ != NULL) | |
3627 | { | |
3628 | const Output_data* od = this->plt_->rel_plt(); | |
3629 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
3630 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
3631 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
3632 | } | |
3633 | ||
3634 | if (this->rel_dyn_ != NULL) | |
3635 | { | |
3636 | const Output_data* od = this->rel_dyn_; | |
3637 | odyn->add_section_address(elfcpp::DT_REL, od); | |
3638 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
3639 | odyn->add_constant(elfcpp::DT_RELENT, | |
3640 | elfcpp::Elf_sizes<32>::rel_size); | |
3641 | } | |
3642 | ||
3643 | if (!parameters->options().shared()) | |
3644 | { | |
3645 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
3646 | // linker at run time, and used by the debugger. | |
3647 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
3648 | } | |
3649 | } | |
3650 | ||
3651 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
3652 | // relocs. | |
3653 | if (this->copy_relocs_.any_saved_relocs()) | |
3654 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); | |
11af873f DK |
3655 | |
3656 | // For the ARM target, we need to add a PT_ARM_EXIDX segment for | |
3657 | // the .ARM.exidx section. | |
3658 | if (!layout->script_options()->saw_phdrs_clause() | |
3659 | && !parameters->options().relocatable()) | |
3660 | { | |
3661 | Output_section* exidx_section = | |
3662 | layout->find_output_section(".ARM.exidx"); | |
3663 | ||
3664 | if (exidx_section != NULL | |
3665 | && exidx_section->type() == elfcpp::SHT_ARM_EXIDX) | |
3666 | { | |
3667 | gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0, 0) | |
3668 | == NULL); | |
3669 | Output_segment* exidx_segment = | |
3670 | layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R); | |
3671 | exidx_segment->add_output_section(exidx_section, elfcpp::PF_R); | |
3672 | } | |
3673 | } | |
4a657b0d DK |
3674 | } |
3675 | ||
bec53400 DK |
3676 | // Return whether a direct absolute static relocation needs to be applied. |
3677 | // In cases where Scan::local() or Scan::global() has created | |
3678 | // a dynamic relocation other than R_ARM_RELATIVE, the addend | |
3679 | // of the relocation is carried in the data, and we must not | |
3680 | // apply the static relocation. | |
3681 | ||
3682 | template<bool big_endian> | |
3683 | inline bool | |
3684 | Target_arm<big_endian>::Relocate::should_apply_static_reloc( | |
3685 | const Sized_symbol<32>* gsym, | |
3686 | int ref_flags, | |
3687 | bool is_32bit, | |
3688 | Output_section* output_section) | |
3689 | { | |
3690 | // If the output section is not allocated, then we didn't call | |
3691 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
3692 | // the reloc here. | |
3693 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
3694 | return true; | |
3695 | ||
3696 | // For local symbols, we will have created a non-RELATIVE dynamic | |
3697 | // relocation only if (a) the output is position independent, | |
3698 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
3699 | // (c) the relocation is not 32 bits wide. | |
3700 | if (gsym == NULL) | |
3701 | return !(parameters->options().output_is_position_independent() | |
3702 | && (ref_flags & Symbol::ABSOLUTE_REF) | |
3703 | && !is_32bit); | |
3704 | ||
3705 | // For global symbols, we use the same helper routines used in the | |
3706 | // scan pass. If we did not create a dynamic relocation, or if we | |
3707 | // created a RELATIVE dynamic relocation, we should apply the static | |
3708 | // relocation. | |
3709 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
3710 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
3711 | && gsym->can_use_relative_reloc(ref_flags | |
3712 | & Symbol::FUNCTION_CALL); | |
3713 | return !has_dyn || is_rel; | |
3714 | } | |
3715 | ||
4a657b0d DK |
3716 | // Perform a relocation. |
3717 | ||
3718 | template<bool big_endian> | |
3719 | inline bool | |
3720 | Target_arm<big_endian>::Relocate::relocate( | |
c121c671 DK |
3721 | const Relocate_info<32, big_endian>* relinfo, |
3722 | Target_arm* target, | |
3723 | Output_section *output_section, | |
3724 | size_t relnum, | |
3725 | const elfcpp::Rel<32, big_endian>& rel, | |
4a657b0d | 3726 | unsigned int r_type, |
c121c671 DK |
3727 | const Sized_symbol<32>* gsym, |
3728 | const Symbol_value<32>* psymval, | |
3729 | unsigned char* view, | |
3730 | elfcpp::Elf_types<32>::Elf_Addr address, | |
4a657b0d DK |
3731 | section_size_type /* view_size */ ) |
3732 | { | |
c121c671 DK |
3733 | typedef Arm_relocate_functions<big_endian> Arm_relocate_functions; |
3734 | ||
3735 | r_type = get_real_reloc_type(r_type); | |
3736 | ||
3737 | // If this the symbol may be a Thumb function, set thumb bit to 1. | |
3738 | bool has_thumb_bit = ((gsym != NULL) | |
3739 | && (gsym->type() == elfcpp::STT_FUNC | |
3740 | || gsym->type() == elfcpp::STT_ARM_TFUNC)); | |
3741 | ||
3742 | // Pick the value to use for symbols defined in shared objects. | |
3743 | Symbol_value<32> symval; | |
3744 | if (gsym != NULL | |
3745 | && gsym->use_plt_offset(reloc_is_non_pic(r_type))) | |
3746 | { | |
3747 | symval.set_output_value(target->plt_section()->address() | |
3748 | + gsym->plt_offset()); | |
3749 | psymval = &symval; | |
3750 | has_thumb_bit = 0; | |
3751 | } | |
3752 | ||
3753 | const Sized_relobj<32, big_endian>* object = relinfo->object; | |
3754 | ||
3755 | // Get the GOT offset if needed. | |
3756 | // The GOT pointer points to the end of the GOT section. | |
3757 | // We need to subtract the size of the GOT section to get | |
3758 | // the actual offset to use in the relocation. | |
3759 | bool have_got_offset = false; | |
3760 | unsigned int got_offset = 0; | |
3761 | switch (r_type) | |
3762 | { | |
3763 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 3764 | case elfcpp::R_ARM_GOT_PREL: |
c121c671 DK |
3765 | if (gsym != NULL) |
3766 | { | |
3767 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3768 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
3769 | - target->got_size()); | |
3770 | } | |
3771 | else | |
3772 | { | |
3773 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
3774 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3775 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3776 | - target->got_size()); | |
3777 | } | |
3778 | have_got_offset = true; | |
3779 | break; | |
3780 | ||
3781 | default: | |
3782 | break; | |
3783 | } | |
3784 | ||
3785 | typename Arm_relocate_functions::Status reloc_status = | |
3786 | Arm_relocate_functions::STATUS_OKAY; | |
4a657b0d DK |
3787 | switch (r_type) |
3788 | { | |
3789 | case elfcpp::R_ARM_NONE: | |
3790 | break; | |
3791 | ||
5e445df6 ILT |
3792 | case elfcpp::R_ARM_ABS8: |
3793 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3794 | output_section)) | |
be8fcb75 ILT |
3795 | reloc_status = Arm_relocate_functions::abs8(view, object, psymval); |
3796 | break; | |
3797 | ||
3798 | case elfcpp::R_ARM_ABS12: | |
3799 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3800 | output_section)) | |
3801 | reloc_status = Arm_relocate_functions::abs12(view, object, psymval); | |
3802 | break; | |
3803 | ||
3804 | case elfcpp::R_ARM_ABS16: | |
3805 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3806 | output_section)) | |
3807 | reloc_status = Arm_relocate_functions::abs16(view, object, psymval); | |
5e445df6 ILT |
3808 | break; |
3809 | ||
c121c671 DK |
3810 | case elfcpp::R_ARM_ABS32: |
3811 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3812 | output_section)) | |
3813 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
3814 | has_thumb_bit); | |
3815 | break; | |
3816 | ||
be8fcb75 ILT |
3817 | case elfcpp::R_ARM_ABS32_NOI: |
3818 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3819 | output_section)) | |
3820 | // No thumb bit for this relocation: (S + A) | |
3821 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
3822 | false); | |
3823 | break; | |
3824 | ||
fd3c5f0b ILT |
3825 | case elfcpp::R_ARM_MOVW_ABS_NC: |
3826 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3827 | output_section)) | |
3828 | reloc_status = Arm_relocate_functions::movw_abs_nc(view, object, | |
3829 | psymval, | |
3830 | has_thumb_bit); | |
3831 | else | |
3832 | gold_error(_("relocation R_ARM_MOVW_ABS_NC cannot be used when making" | |
3833 | "a shared object; recompile with -fPIC")); | |
3834 | break; | |
3835 | ||
3836 | case elfcpp::R_ARM_MOVT_ABS: | |
3837 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3838 | output_section)) | |
3839 | reloc_status = Arm_relocate_functions::movt_abs(view, object, psymval); | |
3840 | else | |
3841 | gold_error(_("relocation R_ARM_MOVT_ABS cannot be used when making" | |
3842 | "a shared object; recompile with -fPIC")); | |
3843 | break; | |
3844 | ||
3845 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
3846 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3847 | output_section)) | |
3848 | reloc_status = Arm_relocate_functions::thm_movw_abs_nc(view, object, | |
3849 | psymval, | |
3850 | has_thumb_bit); | |
3851 | else | |
3852 | gold_error(_("relocation R_ARM_THM_MOVW_ABS_NC cannot be used when" | |
3853 | "making a shared object; recompile with -fPIC")); | |
3854 | break; | |
3855 | ||
3856 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
3857 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3858 | output_section)) | |
3859 | reloc_status = Arm_relocate_functions::thm_movt_abs(view, object, | |
3860 | psymval); | |
3861 | else | |
3862 | gold_error(_("relocation R_ARM_THM_MOVT_ABS cannot be used when" | |
3863 | "making a shared object; recompile with -fPIC")); | |
3864 | break; | |
3865 | ||
c2a122b6 ILT |
3866 | case elfcpp::R_ARM_MOVW_PREL_NC: |
3867 | reloc_status = Arm_relocate_functions::movw_prel_nc(view, object, | |
3868 | psymval, address, | |
3869 | has_thumb_bit); | |
3870 | break; | |
3871 | ||
3872 | case elfcpp::R_ARM_MOVT_PREL: | |
3873 | reloc_status = Arm_relocate_functions::movt_prel(view, object, | |
3874 | psymval, address); | |
3875 | break; | |
3876 | ||
3877 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
3878 | reloc_status = Arm_relocate_functions::thm_movw_prel_nc(view, object, | |
3879 | psymval, address, | |
3880 | has_thumb_bit); | |
3881 | break; | |
3882 | ||
3883 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
3884 | reloc_status = Arm_relocate_functions::thm_movt_prel(view, object, | |
3885 | psymval, address); | |
3886 | break; | |
3887 | ||
c121c671 DK |
3888 | case elfcpp::R_ARM_REL32: |
3889 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
3890 | address, has_thumb_bit); | |
3891 | break; | |
3892 | ||
be8fcb75 ILT |
3893 | case elfcpp::R_ARM_THM_ABS5: |
3894 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
3895 | output_section)) | |
3896 | reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval); | |
3897 | break; | |
3898 | ||
c121c671 DK |
3899 | case elfcpp::R_ARM_THM_CALL: |
3900 | reloc_status = Arm_relocate_functions::thm_call(view, object, psymval, | |
3901 | address, has_thumb_bit); | |
3902 | break; | |
3903 | ||
3904 | case elfcpp::R_ARM_GOTOFF32: | |
3905 | { | |
3906 | elfcpp::Elf_types<32>::Elf_Addr got_origin; | |
3907 | got_origin = target->got_plt_section()->address(); | |
3908 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
3909 | got_origin, has_thumb_bit); | |
3910 | } | |
3911 | break; | |
3912 | ||
3913 | case elfcpp::R_ARM_BASE_PREL: | |
3914 | { | |
3915 | uint32_t origin; | |
3916 | // Get the addressing origin of the output segment defining the | |
3917 | // symbol gsym (AAELF 4.6.1.2 Relocation types) | |
3918 | gold_assert(gsym != NULL); | |
3919 | if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
3920 | origin = gsym->output_segment()->vaddr(); | |
3921 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
3922 | origin = gsym->output_data()->address(); | |
3923 | else | |
3924 | { | |
3925 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3926 | _("cannot find origin of R_ARM_BASE_PREL")); | |
3927 | return true; | |
3928 | } | |
3929 | reloc_status = Arm_relocate_functions::base_prel(view, origin, address); | |
3930 | } | |
3931 | break; | |
3932 | ||
be8fcb75 ILT |
3933 | case elfcpp::R_ARM_BASE_ABS: |
3934 | { | |
3935 | if (!should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
3936 | output_section)) | |
3937 | break; | |
3938 | ||
3939 | uint32_t origin; | |
3940 | // Get the addressing origin of the output segment defining | |
3941 | // the symbol gsym (AAELF 4.6.1.2 Relocation types). | |
3942 | if (gsym == NULL) | |
3943 | // R_ARM_BASE_ABS with the NULL symbol will give the | |
3944 | // absolute address of the GOT origin (GOT_ORG) (see ARM IHI | |
3945 | // 0044C (AAELF): 4.6.1.8 Proxy generating relocations). | |
3946 | origin = target->got_plt_section()->address(); | |
3947 | else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
3948 | origin = gsym->output_segment()->vaddr(); | |
3949 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
3950 | origin = gsym->output_data()->address(); | |
3951 | else | |
3952 | { | |
3953 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
3954 | _("cannot find origin of R_ARM_BASE_ABS")); | |
3955 | return true; | |
3956 | } | |
3957 | ||
3958 | reloc_status = Arm_relocate_functions::base_abs(view, origin); | |
3959 | } | |
3960 | break; | |
3961 | ||
c121c671 DK |
3962 | case elfcpp::R_ARM_GOT_BREL: |
3963 | gold_assert(have_got_offset); | |
3964 | reloc_status = Arm_relocate_functions::got_brel(view, got_offset); | |
3965 | break; | |
3966 | ||
7f5309a5 ILT |
3967 | case elfcpp::R_ARM_GOT_PREL: |
3968 | gold_assert(have_got_offset); | |
3969 | // Get the address origin for GOT PLT, which is allocated right | |
3970 | // after the GOT section, to calculate an absolute address of | |
3971 | // the symbol GOT entry (got_origin + got_offset). | |
3972 | elfcpp::Elf_types<32>::Elf_Addr got_origin; | |
3973 | got_origin = target->got_plt_section()->address(); | |
3974 | reloc_status = Arm_relocate_functions::got_prel(view, | |
3975 | got_origin + got_offset, | |
3976 | address); | |
3977 | break; | |
3978 | ||
c121c671 DK |
3979 | case elfcpp::R_ARM_PLT32: |
3980 | gold_assert(gsym == NULL | |
3981 | || gsym->has_plt_offset() | |
3982 | || gsym->final_value_is_known() | |
3983 | || (gsym->is_defined() | |
3984 | && !gsym->is_from_dynobj() | |
3985 | && !gsym->is_preemptible())); | |
3986 | reloc_status = Arm_relocate_functions::plt32(view, object, psymval, | |
3987 | address, has_thumb_bit); | |
3988 | break; | |
3989 | ||
3990 | case elfcpp::R_ARM_CALL: | |
3991 | reloc_status = Arm_relocate_functions::call(view, object, psymval, | |
3992 | address, has_thumb_bit); | |
3993 | break; | |
3994 | ||
3995 | case elfcpp::R_ARM_JUMP24: | |
3996 | reloc_status = Arm_relocate_functions::jump24(view, object, psymval, | |
3997 | address, has_thumb_bit); | |
3998 | break; | |
3999 | ||
4000 | case elfcpp::R_ARM_PREL31: | |
4001 | reloc_status = Arm_relocate_functions::prel31(view, object, psymval, | |
4002 | address, has_thumb_bit); | |
4003 | break; | |
4004 | ||
4005 | case elfcpp::R_ARM_TARGET1: | |
4006 | // This should have been mapped to another type already. | |
4007 | // Fall through. | |
4008 | case elfcpp::R_ARM_COPY: | |
4009 | case elfcpp::R_ARM_GLOB_DAT: | |
4010 | case elfcpp::R_ARM_JUMP_SLOT: | |
4011 | case elfcpp::R_ARM_RELATIVE: | |
4012 | // These are relocations which should only be seen by the | |
4013 | // dynamic linker, and should never be seen here. | |
4014 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
4015 | _("unexpected reloc %u in object file"), | |
4016 | r_type); | |
4017 | break; | |
4018 | ||
4019 | default: | |
4020 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
4021 | _("unsupported reloc %u"), | |
4022 | r_type); | |
4023 | break; | |
4024 | } | |
4025 | ||
4026 | // Report any errors. | |
4027 | switch (reloc_status) | |
4028 | { | |
4029 | case Arm_relocate_functions::STATUS_OKAY: | |
4030 | break; | |
4031 | case Arm_relocate_functions::STATUS_OVERFLOW: | |
4032 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
4033 | _("relocation overflow in relocation %u"), | |
4034 | r_type); | |
4035 | break; | |
4036 | case Arm_relocate_functions::STATUS_BAD_RELOC: | |
4037 | gold_error_at_location( | |
4038 | relinfo, | |
4039 | relnum, | |
4040 | rel.get_r_offset(), | |
4041 | _("unexpected opcode while processing relocation %u"), | |
4042 | r_type); | |
4043 | break; | |
4a657b0d DK |
4044 | default: |
4045 | gold_unreachable(); | |
4046 | } | |
4047 | ||
4048 | return true; | |
4049 | } | |
4050 | ||
4051 | // Relocate section data. | |
4052 | ||
4053 | template<bool big_endian> | |
4054 | void | |
4055 | Target_arm<big_endian>::relocate_section( | |
4056 | const Relocate_info<32, big_endian>* relinfo, | |
4057 | unsigned int sh_type, | |
4058 | const unsigned char* prelocs, | |
4059 | size_t reloc_count, | |
4060 | Output_section* output_section, | |
4061 | bool needs_special_offset_handling, | |
4062 | unsigned char* view, | |
4063 | elfcpp::Elf_types<32>::Elf_Addr address, | |
364c7fa5 ILT |
4064 | section_size_type view_size, |
4065 | const Reloc_symbol_changes* reloc_symbol_changes) | |
4a657b0d DK |
4066 | { |
4067 | typedef typename Target_arm<big_endian>::Relocate Arm_relocate; | |
4068 | gold_assert(sh_type == elfcpp::SHT_REL); | |
4069 | ||
4070 | gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL, | |
4071 | Arm_relocate>( | |
4072 | relinfo, | |
4073 | this, | |
4074 | prelocs, | |
4075 | reloc_count, | |
4076 | output_section, | |
4077 | needs_special_offset_handling, | |
4078 | view, | |
4079 | address, | |
364c7fa5 ILT |
4080 | view_size, |
4081 | reloc_symbol_changes); | |
4a657b0d DK |
4082 | } |
4083 | ||
4084 | // Return the size of a relocation while scanning during a relocatable | |
4085 | // link. | |
4086 | ||
4087 | template<bool big_endian> | |
4088 | unsigned int | |
4089 | Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
4090 | unsigned int r_type, | |
4091 | Relobj* object) | |
4092 | { | |
4093 | r_type = get_real_reloc_type(r_type); | |
4094 | switch (r_type) | |
4095 | { | |
4096 | case elfcpp::R_ARM_NONE: | |
4097 | return 0; | |
4098 | ||
5e445df6 ILT |
4099 | case elfcpp::R_ARM_ABS8: |
4100 | return 1; | |
4101 | ||
be8fcb75 ILT |
4102 | case elfcpp::R_ARM_ABS16: |
4103 | case elfcpp::R_ARM_THM_ABS5: | |
4104 | return 2; | |
4105 | ||
4a657b0d | 4106 | case elfcpp::R_ARM_ABS32: |
be8fcb75 ILT |
4107 | case elfcpp::R_ARM_ABS32_NOI: |
4108 | case elfcpp::R_ARM_ABS12: | |
4109 | case elfcpp::R_ARM_BASE_ABS: | |
4a657b0d DK |
4110 | case elfcpp::R_ARM_REL32: |
4111 | case elfcpp::R_ARM_THM_CALL: | |
4112 | case elfcpp::R_ARM_GOTOFF32: | |
4113 | case elfcpp::R_ARM_BASE_PREL: | |
4114 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 4115 | case elfcpp::R_ARM_GOT_PREL: |
4a657b0d DK |
4116 | case elfcpp::R_ARM_PLT32: |
4117 | case elfcpp::R_ARM_CALL: | |
4118 | case elfcpp::R_ARM_JUMP24: | |
4119 | case elfcpp::R_ARM_PREL31: | |
fd3c5f0b ILT |
4120 | case elfcpp::R_ARM_MOVW_ABS_NC: |
4121 | case elfcpp::R_ARM_MOVT_ABS: | |
4122 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
4123 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
4124 | case elfcpp::R_ARM_MOVW_PREL_NC: |
4125 | case elfcpp::R_ARM_MOVT_PREL: | |
4126 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
4127 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
4a657b0d DK |
4128 | return 4; |
4129 | ||
4130 | case elfcpp::R_ARM_TARGET1: | |
4131 | // This should have been mapped to another type already. | |
4132 | // Fall through. | |
4133 | case elfcpp::R_ARM_COPY: | |
4134 | case elfcpp::R_ARM_GLOB_DAT: | |
4135 | case elfcpp::R_ARM_JUMP_SLOT: | |
4136 | case elfcpp::R_ARM_RELATIVE: | |
4137 | // These are relocations which should only be seen by the | |
4138 | // dynamic linker, and should never be seen here. | |
4139 | gold_error(_("%s: unexpected reloc %u in object file"), | |
4140 | object->name().c_str(), r_type); | |
4141 | return 0; | |
4142 | ||
4143 | default: | |
4144 | object->error(_("unsupported reloc %u in object file"), r_type); | |
4145 | return 0; | |
4146 | } | |
4147 | } | |
4148 | ||
4149 | // Scan the relocs during a relocatable link. | |
4150 | ||
4151 | template<bool big_endian> | |
4152 | void | |
4153 | Target_arm<big_endian>::scan_relocatable_relocs( | |
4154 | const General_options& options, | |
4155 | Symbol_table* symtab, | |
4156 | Layout* layout, | |
4157 | Sized_relobj<32, big_endian>* object, | |
4158 | unsigned int data_shndx, | |
4159 | unsigned int sh_type, | |
4160 | const unsigned char* prelocs, | |
4161 | size_t reloc_count, | |
4162 | Output_section* output_section, | |
4163 | bool needs_special_offset_handling, | |
4164 | size_t local_symbol_count, | |
4165 | const unsigned char* plocal_symbols, | |
4166 | Relocatable_relocs* rr) | |
4167 | { | |
4168 | gold_assert(sh_type == elfcpp::SHT_REL); | |
4169 | ||
4170 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
4171 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
4172 | ||
4173 | gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL, | |
4174 | Scan_relocatable_relocs>( | |
4175 | options, | |
4176 | symtab, | |
4177 | layout, | |
4178 | object, | |
4179 | data_shndx, | |
4180 | prelocs, | |
4181 | reloc_count, | |
4182 | output_section, | |
4183 | needs_special_offset_handling, | |
4184 | local_symbol_count, | |
4185 | plocal_symbols, | |
4186 | rr); | |
4187 | } | |
4188 | ||
4189 | // Relocate a section during a relocatable link. | |
4190 | ||
4191 | template<bool big_endian> | |
4192 | void | |
4193 | Target_arm<big_endian>::relocate_for_relocatable( | |
4194 | const Relocate_info<32, big_endian>* relinfo, | |
4195 | unsigned int sh_type, | |
4196 | const unsigned char* prelocs, | |
4197 | size_t reloc_count, | |
4198 | Output_section* output_section, | |
4199 | off_t offset_in_output_section, | |
4200 | const Relocatable_relocs* rr, | |
4201 | unsigned char* view, | |
4202 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
4203 | section_size_type view_size, | |
4204 | unsigned char* reloc_view, | |
4205 | section_size_type reloc_view_size) | |
4206 | { | |
4207 | gold_assert(sh_type == elfcpp::SHT_REL); | |
4208 | ||
4209 | gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>( | |
4210 | relinfo, | |
4211 | prelocs, | |
4212 | reloc_count, | |
4213 | output_section, | |
4214 | offset_in_output_section, | |
4215 | rr, | |
4216 | view, | |
4217 | view_address, | |
4218 | view_size, | |
4219 | reloc_view, | |
4220 | reloc_view_size); | |
4221 | } | |
4222 | ||
94cdfcff DK |
4223 | // Return the value to use for a dynamic symbol which requires special |
4224 | // treatment. This is how we support equality comparisons of function | |
4225 | // pointers across shared library boundaries, as described in the | |
4226 | // processor specific ABI supplement. | |
4227 | ||
4a657b0d DK |
4228 | template<bool big_endian> |
4229 | uint64_t | |
94cdfcff | 4230 | Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const |
4a657b0d | 4231 | { |
94cdfcff DK |
4232 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
4233 | return this->plt_section()->address() + gsym->plt_offset(); | |
4a657b0d DK |
4234 | } |
4235 | ||
4236 | // Map platform-specific relocs to real relocs | |
4237 | // | |
4238 | template<bool big_endian> | |
4239 | unsigned int | |
4240 | Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type) | |
4241 | { | |
4242 | switch (r_type) | |
4243 | { | |
4244 | case elfcpp::R_ARM_TARGET1: | |
4245 | // This is either R_ARM_ABS32 or R_ARM_REL32; | |
4246 | return elfcpp::R_ARM_ABS32; | |
4247 | ||
4248 | case elfcpp::R_ARM_TARGET2: | |
4249 | // This can be any reloc type but ususally is R_ARM_GOT_PREL | |
4250 | return elfcpp::R_ARM_GOT_PREL; | |
4251 | ||
4252 | default: | |
4253 | return r_type; | |
4254 | } | |
4255 | } | |
4256 | ||
4257 | // The selector for arm object files. | |
4258 | ||
4259 | template<bool big_endian> | |
4260 | class Target_selector_arm : public Target_selector | |
4261 | { | |
4262 | public: | |
4263 | Target_selector_arm() | |
4264 | : Target_selector(elfcpp::EM_ARM, 32, big_endian, | |
4265 | (big_endian ? "elf32-bigarm" : "elf32-littlearm")) | |
4266 | { } | |
4267 | ||
4268 | Target* | |
4269 | do_instantiate_target() | |
4270 | { return new Target_arm<big_endian>(); } | |
4271 | }; | |
4272 | ||
4273 | Target_selector_arm<false> target_selector_arm; | |
4274 | Target_selector_arm<true> target_selector_armbe; | |
4275 | ||
4276 | } // End anonymous namespace. |