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