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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" |
a0351a69 | 49 | #include "attributes.h" |
4a657b0d DK |
50 | |
51 | namespace | |
52 | { | |
53 | ||
54 | using namespace gold; | |
55 | ||
94cdfcff DK |
56 | template<bool big_endian> |
57 | class Output_data_plt_arm; | |
58 | ||
56ee5e00 DK |
59 | template<bool big_endian> |
60 | class Stub_table; | |
61 | ||
62 | template<bool big_endian> | |
63 | class Arm_input_section; | |
64 | ||
07f508a2 DK |
65 | template<bool big_endian> |
66 | class Arm_output_section; | |
67 | ||
68 | template<bool big_endian> | |
69 | class Arm_relobj; | |
70 | ||
b569affa DK |
71 | template<bool big_endian> |
72 | class Target_arm; | |
73 | ||
74 | // For convenience. | |
75 | typedef elfcpp::Elf_types<32>::Elf_Addr Arm_address; | |
76 | ||
77 | // Maximum branch offsets for ARM, THUMB and THUMB2. | |
78 | const int32_t ARM_MAX_FWD_BRANCH_OFFSET = ((((1 << 23) - 1) << 2) + 8); | |
79 | const int32_t ARM_MAX_BWD_BRANCH_OFFSET = ((-((1 << 23) << 2)) + 8); | |
80 | const int32_t THM_MAX_FWD_BRANCH_OFFSET = ((1 << 22) -2 + 4); | |
81 | const int32_t THM_MAX_BWD_BRANCH_OFFSET = (-(1 << 22) + 4); | |
82 | const int32_t THM2_MAX_FWD_BRANCH_OFFSET = (((1 << 24) - 2) + 4); | |
83 | const int32_t THM2_MAX_BWD_BRANCH_OFFSET = (-(1 << 24) + 4); | |
84 | ||
4a657b0d DK |
85 | // The arm target class. |
86 | // | |
87 | // This is a very simple port of gold for ARM-EABI. It is intended for | |
88 | // supporting Android only for the time being. Only these relocation types | |
89 | // are supported. | |
90 | // | |
91 | // R_ARM_NONE | |
92 | // R_ARM_ABS32 | |
be8fcb75 ILT |
93 | // R_ARM_ABS32_NOI |
94 | // R_ARM_ABS16 | |
95 | // R_ARM_ABS12 | |
96 | // R_ARM_ABS8 | |
97 | // R_ARM_THM_ABS5 | |
98 | // R_ARM_BASE_ABS | |
4a657b0d DK |
99 | // R_ARM_REL32 |
100 | // R_ARM_THM_CALL | |
101 | // R_ARM_COPY | |
102 | // R_ARM_GLOB_DAT | |
103 | // R_ARM_BASE_PREL | |
104 | // R_ARM_JUMP_SLOT | |
105 | // R_ARM_RELATIVE | |
106 | // R_ARM_GOTOFF32 | |
107 | // R_ARM_GOT_BREL | |
7f5309a5 | 108 | // R_ARM_GOT_PREL |
4a657b0d DK |
109 | // R_ARM_PLT32 |
110 | // R_ARM_CALL | |
111 | // R_ARM_JUMP24 | |
112 | // R_ARM_TARGET1 | |
113 | // R_ARM_PREL31 | |
7f5309a5 | 114 | // R_ARM_ABS8 |
fd3c5f0b ILT |
115 | // R_ARM_MOVW_ABS_NC |
116 | // R_ARM_MOVT_ABS | |
117 | // R_ARM_THM_MOVW_ABS_NC | |
c2a122b6 ILT |
118 | // R_ARM_THM_MOVT_ABS |
119 | // R_ARM_MOVW_PREL_NC | |
120 | // R_ARM_MOVT_PREL | |
121 | // R_ARM_THM_MOVW_PREL_NC | |
122 | // R_ARM_THM_MOVT_PREL | |
4a657b0d | 123 | // |
4a657b0d | 124 | // TODOs: |
4a657b0d | 125 | // - Support more relocation types as needed. |
94cdfcff DK |
126 | // - Make PLTs more flexible for different architecture features like |
127 | // Thumb-2 and BE8. | |
11af873f | 128 | // There are probably a lot more. |
4a657b0d | 129 | |
b569affa DK |
130 | // Instruction template class. This class is similar to the insn_sequence |
131 | // struct in bfd/elf32-arm.c. | |
132 | ||
133 | class Insn_template | |
134 | { | |
135 | public: | |
136 | // Types of instruction templates. | |
137 | enum Type | |
138 | { | |
139 | THUMB16_TYPE = 1, | |
140 | THUMB32_TYPE, | |
141 | ARM_TYPE, | |
142 | DATA_TYPE | |
143 | }; | |
144 | ||
145 | // Factory methods to create instrunction templates in different formats. | |
146 | ||
147 | static const Insn_template | |
148 | thumb16_insn(uint32_t data) | |
149 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 0); } | |
150 | ||
151 | // A bit of a hack. A Thumb conditional branch, in which the proper | |
152 | // condition is inserted when we build the stub. | |
153 | static const Insn_template | |
154 | thumb16_bcond_insn(uint32_t data) | |
155 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 1); } | |
156 | ||
157 | static const Insn_template | |
158 | thumb32_insn(uint32_t data) | |
159 | { return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_NONE, 0); } | |
160 | ||
161 | static const Insn_template | |
162 | thumb32_b_insn(uint32_t data, int reloc_addend) | |
163 | { | |
164 | return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_THM_JUMP24, | |
165 | reloc_addend); | |
166 | } | |
167 | ||
168 | static const Insn_template | |
169 | arm_insn(uint32_t data) | |
170 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_NONE, 0); } | |
171 | ||
172 | static const Insn_template | |
173 | arm_rel_insn(unsigned data, int reloc_addend) | |
174 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_JUMP24, reloc_addend); } | |
175 | ||
176 | static const Insn_template | |
177 | data_word(unsigned data, unsigned int r_type, int reloc_addend) | |
178 | { return Insn_template(data, DATA_TYPE, r_type, reloc_addend); } | |
179 | ||
180 | // Accessors. This class is used for read-only objects so no modifiers | |
181 | // are provided. | |
182 | ||
183 | uint32_t | |
184 | data() const | |
185 | { return this->data_; } | |
186 | ||
187 | // Return the instruction sequence type of this. | |
188 | Type | |
189 | type() const | |
190 | { return this->type_; } | |
191 | ||
192 | // Return the ARM relocation type of this. | |
193 | unsigned int | |
194 | r_type() const | |
195 | { return this->r_type_; } | |
196 | ||
197 | int32_t | |
198 | reloc_addend() const | |
199 | { return this->reloc_addend_; } | |
200 | ||
201 | // Return size of instrunction template in bytes. | |
202 | size_t | |
203 | size() const; | |
204 | ||
205 | // Return byte-alignment of instrunction template. | |
206 | unsigned | |
207 | alignment() const; | |
208 | ||
209 | private: | |
210 | // We make the constructor private to ensure that only the factory | |
211 | // methods are used. | |
212 | inline | |
2ea97941 ILT |
213 | Insn_template(unsigned data, Type type, unsigned int r_type, int reloc_addend) |
214 | : data_(data), type_(type), r_type_(r_type), reloc_addend_(reloc_addend) | |
b569affa DK |
215 | { } |
216 | ||
217 | // Instruction specific data. This is used to store information like | |
218 | // some of the instruction bits. | |
219 | uint32_t data_; | |
220 | // Instruction template type. | |
221 | Type type_; | |
222 | // Relocation type if there is a relocation or R_ARM_NONE otherwise. | |
223 | unsigned int r_type_; | |
224 | // Relocation addend. | |
225 | int32_t reloc_addend_; | |
226 | }; | |
227 | ||
228 | // Macro for generating code to stub types. One entry per long/short | |
229 | // branch stub | |
230 | ||
231 | #define DEF_STUBS \ | |
232 | DEF_STUB(long_branch_any_any) \ | |
233 | DEF_STUB(long_branch_v4t_arm_thumb) \ | |
234 | DEF_STUB(long_branch_thumb_only) \ | |
235 | DEF_STUB(long_branch_v4t_thumb_thumb) \ | |
236 | DEF_STUB(long_branch_v4t_thumb_arm) \ | |
237 | DEF_STUB(short_branch_v4t_thumb_arm) \ | |
238 | DEF_STUB(long_branch_any_arm_pic) \ | |
239 | DEF_STUB(long_branch_any_thumb_pic) \ | |
240 | DEF_STUB(long_branch_v4t_thumb_thumb_pic) \ | |
241 | DEF_STUB(long_branch_v4t_arm_thumb_pic) \ | |
242 | DEF_STUB(long_branch_v4t_thumb_arm_pic) \ | |
243 | DEF_STUB(long_branch_thumb_only_pic) \ | |
244 | DEF_STUB(a8_veneer_b_cond) \ | |
245 | DEF_STUB(a8_veneer_b) \ | |
246 | DEF_STUB(a8_veneer_bl) \ | |
247 | DEF_STUB(a8_veneer_blx) | |
248 | ||
249 | // Stub types. | |
250 | ||
251 | #define DEF_STUB(x) arm_stub_##x, | |
252 | typedef enum | |
253 | { | |
254 | arm_stub_none, | |
255 | DEF_STUBS | |
256 | ||
257 | // First reloc stub type. | |
258 | arm_stub_reloc_first = arm_stub_long_branch_any_any, | |
259 | // Last reloc stub type. | |
260 | arm_stub_reloc_last = arm_stub_long_branch_thumb_only_pic, | |
261 | ||
262 | // First Cortex-A8 stub type. | |
263 | arm_stub_cortex_a8_first = arm_stub_a8_veneer_b_cond, | |
264 | // Last Cortex-A8 stub type. | |
265 | arm_stub_cortex_a8_last = arm_stub_a8_veneer_blx, | |
266 | ||
267 | // Last stub type. | |
268 | arm_stub_type_last = arm_stub_a8_veneer_blx | |
269 | } Stub_type; | |
270 | #undef DEF_STUB | |
271 | ||
272 | // Stub template class. Templates are meant to be read-only objects. | |
273 | // A stub template for a stub type contains all read-only attributes | |
274 | // common to all stubs of the same type. | |
275 | ||
276 | class Stub_template | |
277 | { | |
278 | public: | |
279 | Stub_template(Stub_type, const Insn_template*, size_t); | |
280 | ||
281 | ~Stub_template() | |
282 | { } | |
283 | ||
284 | // Return stub type. | |
285 | Stub_type | |
286 | type() const | |
287 | { return this->type_; } | |
288 | ||
289 | // Return an array of instruction templates. | |
290 | const Insn_template* | |
291 | insns() const | |
292 | { return this->insns_; } | |
293 | ||
294 | // Return size of template in number of instructions. | |
295 | size_t | |
296 | insn_count() const | |
297 | { return this->insn_count_; } | |
298 | ||
299 | // Return size of template in bytes. | |
300 | size_t | |
301 | size() const | |
302 | { return this->size_; } | |
303 | ||
304 | // Return alignment of the stub template. | |
305 | unsigned | |
306 | alignment() const | |
307 | { return this->alignment_; } | |
308 | ||
309 | // Return whether entry point is in thumb mode. | |
310 | bool | |
311 | entry_in_thumb_mode() const | |
312 | { return this->entry_in_thumb_mode_; } | |
313 | ||
314 | // Return number of relocations in this template. | |
315 | size_t | |
316 | reloc_count() const | |
317 | { return this->relocs_.size(); } | |
318 | ||
319 | // Return index of the I-th instruction with relocation. | |
320 | size_t | |
321 | reloc_insn_index(size_t i) const | |
322 | { | |
323 | gold_assert(i < this->relocs_.size()); | |
324 | return this->relocs_[i].first; | |
325 | } | |
326 | ||
327 | // Return the offset of the I-th instruction with relocation from the | |
328 | // beginning of the stub. | |
329 | section_size_type | |
330 | reloc_offset(size_t i) const | |
331 | { | |
332 | gold_assert(i < this->relocs_.size()); | |
333 | return this->relocs_[i].second; | |
334 | } | |
335 | ||
336 | private: | |
337 | // This contains information about an instruction template with a relocation | |
338 | // and its offset from start of stub. | |
339 | typedef std::pair<size_t, section_size_type> Reloc; | |
340 | ||
341 | // A Stub_template may not be copied. We want to share templates as much | |
342 | // as possible. | |
343 | Stub_template(const Stub_template&); | |
344 | Stub_template& operator=(const Stub_template&); | |
345 | ||
346 | // Stub type. | |
347 | Stub_type type_; | |
348 | // Points to an array of Insn_templates. | |
349 | const Insn_template* insns_; | |
350 | // Number of Insn_templates in insns_[]. | |
351 | size_t insn_count_; | |
352 | // Size of templated instructions in bytes. | |
353 | size_t size_; | |
354 | // Alignment of templated instructions. | |
355 | unsigned alignment_; | |
356 | // Flag to indicate if entry is in thumb mode. | |
357 | bool entry_in_thumb_mode_; | |
358 | // A table of reloc instruction indices and offsets. We can find these by | |
359 | // looking at the instruction templates but we pre-compute and then stash | |
360 | // them here for speed. | |
361 | std::vector<Reloc> relocs_; | |
362 | }; | |
363 | ||
364 | // | |
365 | // A class for code stubs. This is a base class for different type of | |
366 | // stubs used in the ARM target. | |
367 | // | |
368 | ||
369 | class Stub | |
370 | { | |
371 | private: | |
372 | static const section_offset_type invalid_offset = | |
373 | static_cast<section_offset_type>(-1); | |
374 | ||
375 | public: | |
2ea97941 ILT |
376 | Stub(const Stub_template* stub_template) |
377 | : stub_template_(stub_template), offset_(invalid_offset) | |
b569affa DK |
378 | { } |
379 | ||
380 | virtual | |
381 | ~Stub() | |
382 | { } | |
383 | ||
384 | // Return the stub template. | |
385 | const Stub_template* | |
386 | stub_template() const | |
387 | { return this->stub_template_; } | |
388 | ||
389 | // Return offset of code stub from beginning of its containing stub table. | |
390 | section_offset_type | |
391 | offset() const | |
392 | { | |
393 | gold_assert(this->offset_ != invalid_offset); | |
394 | return this->offset_; | |
395 | } | |
396 | ||
397 | // Set offset of code stub from beginning of its containing stub table. | |
398 | void | |
2ea97941 ILT |
399 | set_offset(section_offset_type offset) |
400 | { this->offset_ = offset; } | |
b569affa DK |
401 | |
402 | // Return the relocation target address of the i-th relocation in the | |
403 | // stub. This must be defined in a child class. | |
404 | Arm_address | |
405 | reloc_target(size_t i) | |
406 | { return this->do_reloc_target(i); } | |
407 | ||
408 | // Write a stub at output VIEW. BIG_ENDIAN select how a stub is written. | |
409 | void | |
410 | write(unsigned char* view, section_size_type view_size, bool big_endian) | |
411 | { this->do_write(view, view_size, big_endian); } | |
412 | ||
413 | protected: | |
414 | // This must be defined in the child class. | |
415 | virtual Arm_address | |
416 | do_reloc_target(size_t) = 0; | |
417 | ||
418 | // This must be defined in the child class. | |
419 | virtual void | |
420 | do_write(unsigned char*, section_size_type, bool) = 0; | |
421 | ||
422 | private: | |
423 | // Its template. | |
424 | const Stub_template* stub_template_; | |
425 | // Offset within the section of containing this stub. | |
426 | section_offset_type offset_; | |
427 | }; | |
428 | ||
429 | // Reloc stub class. These are stubs we use to fix up relocation because | |
430 | // of limited branch ranges. | |
431 | ||
432 | class Reloc_stub : public Stub | |
433 | { | |
434 | public: | |
435 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); | |
436 | // We assume we never jump to this address. | |
437 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
438 | ||
439 | // Return destination address. | |
440 | Arm_address | |
441 | destination_address() const | |
442 | { | |
443 | gold_assert(this->destination_address_ != this->invalid_address); | |
444 | return this->destination_address_; | |
445 | } | |
446 | ||
447 | // Set destination address. | |
448 | void | |
449 | set_destination_address(Arm_address address) | |
450 | { | |
451 | gold_assert(address != this->invalid_address); | |
452 | this->destination_address_ = address; | |
453 | } | |
454 | ||
455 | // Reset destination address. | |
456 | void | |
457 | reset_destination_address() | |
458 | { this->destination_address_ = this->invalid_address; } | |
459 | ||
460 | // Determine stub type for a branch of a relocation of R_TYPE going | |
461 | // from BRANCH_ADDRESS to BRANCH_TARGET. If TARGET_IS_THUMB is set, | |
462 | // the branch target is a thumb instruction. TARGET is used for look | |
463 | // up ARM-specific linker settings. | |
464 | static Stub_type | |
465 | stub_type_for_reloc(unsigned int r_type, Arm_address branch_address, | |
466 | Arm_address branch_target, bool target_is_thumb); | |
467 | ||
468 | // Reloc_stub key. A key is logically a triplet of a stub type, a symbol | |
469 | // and an addend. Since we treat global and local symbol differently, we | |
470 | // use a Symbol object for a global symbol and a object-index pair for | |
471 | // a local symbol. | |
472 | class Key | |
473 | { | |
474 | public: | |
475 | // If SYMBOL is not null, this is a global symbol, we ignore RELOBJ and | |
476 | // R_SYM. Otherwise, this is a local symbol and RELOBJ must non-NULL | |
477 | // and R_SYM must not be invalid_index. | |
2ea97941 ILT |
478 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, |
479 | unsigned int r_sym, int32_t addend) | |
480 | : stub_type_(stub_type), addend_(addend) | |
b569affa | 481 | { |
2ea97941 | 482 | if (symbol != NULL) |
b569affa DK |
483 | { |
484 | this->r_sym_ = Reloc_stub::invalid_index; | |
2ea97941 | 485 | this->u_.symbol = symbol; |
b569affa DK |
486 | } |
487 | else | |
488 | { | |
2ea97941 ILT |
489 | gold_assert(relobj != NULL && r_sym != invalid_index); |
490 | this->r_sym_ = r_sym; | |
491 | this->u_.relobj = relobj; | |
b569affa DK |
492 | } |
493 | } | |
494 | ||
495 | ~Key() | |
496 | { } | |
497 | ||
498 | // Accessors: Keys are meant to be read-only object so no modifiers are | |
499 | // provided. | |
500 | ||
501 | // Return stub type. | |
502 | Stub_type | |
503 | stub_type() const | |
504 | { return this->stub_type_; } | |
505 | ||
506 | // Return the local symbol index or invalid_index. | |
507 | unsigned int | |
508 | r_sym() const | |
509 | { return this->r_sym_; } | |
510 | ||
511 | // Return the symbol if there is one. | |
512 | const Symbol* | |
513 | symbol() const | |
514 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
515 | ||
516 | // Return the relobj if there is one. | |
517 | const Relobj* | |
518 | relobj() const | |
519 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
520 | ||
521 | // Whether this equals to another key k. | |
522 | bool | |
523 | eq(const Key& k) const | |
524 | { | |
525 | return ((this->stub_type_ == k.stub_type_) | |
526 | && (this->r_sym_ == k.r_sym_) | |
527 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
528 | ? (this->u_.relobj == k.u_.relobj) | |
529 | : (this->u_.symbol == k.u_.symbol)) | |
530 | && (this->addend_ == k.addend_)); | |
531 | } | |
532 | ||
533 | // Return a hash value. | |
534 | size_t | |
535 | hash_value() const | |
536 | { | |
537 | return (this->stub_type_ | |
538 | ^ this->r_sym_ | |
539 | ^ gold::string_hash<char>( | |
540 | (this->r_sym_ != Reloc_stub::invalid_index) | |
541 | ? this->u_.relobj->name().c_str() | |
542 | : this->u_.symbol->name()) | |
543 | ^ this->addend_); | |
544 | } | |
545 | ||
546 | // Functors for STL associative containers. | |
547 | struct hash | |
548 | { | |
549 | size_t | |
550 | operator()(const Key& k) const | |
551 | { return k.hash_value(); } | |
552 | }; | |
553 | ||
554 | struct equal_to | |
555 | { | |
556 | bool | |
557 | operator()(const Key& k1, const Key& k2) const | |
558 | { return k1.eq(k2); } | |
559 | }; | |
560 | ||
561 | // Name of key. This is mainly for debugging. | |
562 | std::string | |
563 | name() const; | |
564 | ||
565 | private: | |
566 | // Stub type. | |
567 | Stub_type stub_type_; | |
568 | // If this is a local symbol, this is the index in the defining object. | |
569 | // Otherwise, it is invalid_index for a global symbol. | |
570 | unsigned int r_sym_; | |
571 | // If r_sym_ is invalid index. This points to a global symbol. | |
572 | // Otherwise, this points a relobj. We used the unsized and target | |
eb44217c | 573 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and |
b569affa DK |
574 | // Arm_relobj. This is done to avoid making the stub class a template |
575 | // as most of the stub machinery is endianity-neutral. However, it | |
576 | // may require a bit of casting done by users of this class. | |
577 | union | |
578 | { | |
579 | const Symbol* symbol; | |
580 | const Relobj* relobj; | |
581 | } u_; | |
582 | // Addend associated with a reloc. | |
583 | int32_t addend_; | |
584 | }; | |
585 | ||
586 | protected: | |
587 | // Reloc_stubs are created via a stub factory. So these are protected. | |
2ea97941 ILT |
588 | Reloc_stub(const Stub_template* stub_template) |
589 | : Stub(stub_template), destination_address_(invalid_address) | |
b569affa DK |
590 | { } |
591 | ||
592 | ~Reloc_stub() | |
593 | { } | |
594 | ||
595 | friend class Stub_factory; | |
596 | ||
597 | private: | |
598 | // Return the relocation target address of the i-th relocation in the | |
599 | // stub. | |
600 | Arm_address | |
601 | do_reloc_target(size_t i) | |
602 | { | |
603 | // All reloc stub have only one relocation. | |
604 | gold_assert(i == 0); | |
605 | return this->destination_address_; | |
606 | } | |
607 | ||
608 | // A template to implement do_write below. | |
609 | template<bool big_endian> | |
610 | void inline | |
611 | do_fixed_endian_write(unsigned char*, section_size_type); | |
612 | ||
613 | // Write a stub. | |
614 | void | |
615 | do_write(unsigned char* view, section_size_type view_size, bool big_endian); | |
616 | ||
617 | // Address of destination. | |
618 | Arm_address destination_address_; | |
619 | }; | |
620 | ||
621 | // Stub factory class. | |
622 | ||
623 | class Stub_factory | |
624 | { | |
625 | public: | |
626 | // Return the unique instance of this class. | |
627 | static const Stub_factory& | |
628 | get_instance() | |
629 | { | |
630 | static Stub_factory singleton; | |
631 | return singleton; | |
632 | } | |
633 | ||
634 | // Make a relocation stub. | |
635 | Reloc_stub* | |
636 | make_reloc_stub(Stub_type stub_type) const | |
637 | { | |
638 | gold_assert(stub_type >= arm_stub_reloc_first | |
639 | && stub_type <= arm_stub_reloc_last); | |
640 | return new Reloc_stub(this->stub_templates_[stub_type]); | |
641 | } | |
642 | ||
643 | private: | |
644 | // Constructor and destructor are protected since we only return a single | |
645 | // instance created in Stub_factory::get_instance(). | |
646 | ||
647 | Stub_factory(); | |
648 | ||
649 | // A Stub_factory may not be copied since it is a singleton. | |
650 | Stub_factory(const Stub_factory&); | |
651 | Stub_factory& operator=(Stub_factory&); | |
652 | ||
653 | // Stub templates. These are initialized in the constructor. | |
654 | const Stub_template* stub_templates_[arm_stub_type_last+1]; | |
655 | }; | |
656 | ||
56ee5e00 DK |
657 | // A class to hold stubs for the ARM target. |
658 | ||
659 | template<bool big_endian> | |
660 | class Stub_table : public Output_data | |
661 | { | |
662 | public: | |
2ea97941 ILT |
663 | Stub_table(Arm_input_section<big_endian>* owner) |
664 | : Output_data(), addralign_(1), owner_(owner), has_been_changed_(false), | |
56ee5e00 DK |
665 | reloc_stubs_() |
666 | { } | |
667 | ||
668 | ~Stub_table() | |
669 | { } | |
670 | ||
671 | // Owner of this stub table. | |
672 | Arm_input_section<big_endian>* | |
673 | owner() const | |
674 | { return this->owner_; } | |
675 | ||
676 | // Whether this stub table is empty. | |
677 | bool | |
678 | empty() const | |
679 | { return this->reloc_stubs_.empty(); } | |
680 | ||
681 | // Whether this has been changed. | |
682 | bool | |
683 | has_been_changed() const | |
684 | { return this->has_been_changed_; } | |
685 | ||
686 | // Set the has-been-changed flag. | |
687 | void | |
688 | set_has_been_changed(bool value) | |
689 | { this->has_been_changed_ = value; } | |
690 | ||
691 | // Return the current data size. | |
692 | off_t | |
693 | current_data_size() const | |
694 | { return this->current_data_size_for_child(); } | |
695 | ||
696 | // Add a STUB with using KEY. Caller is reponsible for avoid adding | |
697 | // if already a STUB with the same key has been added. | |
698 | void | |
699 | add_reloc_stub(Reloc_stub* stub, const Reloc_stub::Key& key); | |
700 | ||
701 | // Look up a relocation stub using KEY. Return NULL if there is none. | |
702 | Reloc_stub* | |
703 | find_reloc_stub(const Reloc_stub::Key& key) const | |
704 | { | |
705 | typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.find(key); | |
706 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; | |
707 | } | |
708 | ||
709 | // Relocate stubs in this stub table. | |
710 | void | |
711 | relocate_stubs(const Relocate_info<32, big_endian>*, | |
712 | Target_arm<big_endian>*, Output_section*, | |
713 | unsigned char*, Arm_address, section_size_type); | |
714 | ||
715 | protected: | |
716 | // Write out section contents. | |
717 | void | |
718 | do_write(Output_file*); | |
719 | ||
720 | // Return the required alignment. | |
721 | uint64_t | |
722 | do_addralign() const | |
723 | { return this->addralign_; } | |
724 | ||
725 | // Finalize data size. | |
726 | void | |
727 | set_final_data_size() | |
728 | { this->set_data_size(this->current_data_size_for_child()); } | |
729 | ||
730 | // Reset address and file offset. | |
731 | void | |
732 | do_reset_address_and_file_offset(); | |
733 | ||
734 | private: | |
735 | // Unordered map of stubs. | |
736 | typedef | |
737 | Unordered_map<Reloc_stub::Key, Reloc_stub*, Reloc_stub::Key::hash, | |
738 | Reloc_stub::Key::equal_to> | |
739 | Reloc_stub_map; | |
740 | ||
741 | // Address alignment | |
742 | uint64_t addralign_; | |
743 | // Owner of this stub table. | |
744 | Arm_input_section<big_endian>* owner_; | |
745 | // This is set to true during relaxiong if the size of the stub table | |
746 | // has been changed. | |
747 | bool has_been_changed_; | |
748 | // The relocation stubs. | |
749 | Reloc_stub_map reloc_stubs_; | |
750 | }; | |
751 | ||
10ad9fe5 DK |
752 | // A class to wrap an ordinary input section containing executable code. |
753 | ||
754 | template<bool big_endian> | |
755 | class Arm_input_section : public Output_relaxed_input_section | |
756 | { | |
757 | public: | |
2ea97941 ILT |
758 | Arm_input_section(Relobj* relobj, unsigned int shndx) |
759 | : Output_relaxed_input_section(relobj, shndx, 1), | |
10ad9fe5 DK |
760 | original_addralign_(1), original_size_(0), stub_table_(NULL) |
761 | { } | |
762 | ||
763 | ~Arm_input_section() | |
764 | { } | |
765 | ||
766 | // Initialize. | |
767 | void | |
768 | init(); | |
769 | ||
770 | // Whether this is a stub table owner. | |
771 | bool | |
772 | is_stub_table_owner() const | |
773 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } | |
774 | ||
775 | // Return the stub table. | |
776 | Stub_table<big_endian>* | |
777 | stub_table() const | |
778 | { return this->stub_table_; } | |
779 | ||
780 | // Set the stub_table. | |
781 | void | |
2ea97941 ILT |
782 | set_stub_table(Stub_table<big_endian>* stub_table) |
783 | { this->stub_table_ = stub_table; } | |
10ad9fe5 | 784 | |
07f508a2 DK |
785 | // Downcast a base pointer to an Arm_input_section pointer. This is |
786 | // not type-safe but we only use Arm_input_section not the base class. | |
787 | static Arm_input_section<big_endian>* | |
788 | as_arm_input_section(Output_relaxed_input_section* poris) | |
789 | { return static_cast<Arm_input_section<big_endian>*>(poris); } | |
790 | ||
10ad9fe5 DK |
791 | protected: |
792 | // Write data to output file. | |
793 | void | |
794 | do_write(Output_file*); | |
795 | ||
796 | // Return required alignment of this. | |
797 | uint64_t | |
798 | do_addralign() const | |
799 | { | |
800 | if (this->is_stub_table_owner()) | |
801 | return std::max(this->stub_table_->addralign(), | |
802 | this->original_addralign_); | |
803 | else | |
804 | return this->original_addralign_; | |
805 | } | |
806 | ||
807 | // Finalize data size. | |
808 | void | |
809 | set_final_data_size(); | |
810 | ||
811 | // Reset address and file offset. | |
812 | void | |
813 | do_reset_address_and_file_offset(); | |
814 | ||
815 | // Output offset. | |
816 | bool | |
2ea97941 ILT |
817 | do_output_offset(const Relobj* object, unsigned int shndx, |
818 | section_offset_type offset, | |
10ad9fe5 DK |
819 | section_offset_type* poutput) const |
820 | { | |
821 | if ((object == this->relobj()) | |
2ea97941 ILT |
822 | && (shndx == this->shndx()) |
823 | && (offset >= 0) | |
824 | && (convert_types<uint64_t, section_offset_type>(offset) | |
10ad9fe5 DK |
825 | <= this->original_size_)) |
826 | { | |
2ea97941 | 827 | *poutput = offset; |
10ad9fe5 DK |
828 | return true; |
829 | } | |
830 | else | |
831 | return false; | |
832 | } | |
833 | ||
834 | private: | |
835 | // Copying is not allowed. | |
836 | Arm_input_section(const Arm_input_section&); | |
837 | Arm_input_section& operator=(const Arm_input_section&); | |
838 | ||
839 | // Address alignment of the original input section. | |
840 | uint64_t original_addralign_; | |
841 | // Section size of the original input section. | |
842 | uint64_t original_size_; | |
843 | // Stub table. | |
844 | Stub_table<big_endian>* stub_table_; | |
845 | }; | |
846 | ||
07f508a2 DK |
847 | // Arm output section class. This is defined mainly to add a number of |
848 | // stub generation methods. | |
849 | ||
850 | template<bool big_endian> | |
851 | class Arm_output_section : public Output_section | |
852 | { | |
853 | public: | |
2ea97941 ILT |
854 | Arm_output_section(const char* name, elfcpp::Elf_Word type, |
855 | elfcpp::Elf_Xword flags) | |
856 | : Output_section(name, type, flags) | |
07f508a2 DK |
857 | { } |
858 | ||
859 | ~Arm_output_section() | |
860 | { } | |
861 | ||
862 | // Group input sections for stub generation. | |
863 | void | |
864 | group_sections(section_size_type, bool, Target_arm<big_endian>*); | |
865 | ||
866 | // Downcast a base pointer to an Arm_output_section pointer. This is | |
867 | // not type-safe but we only use Arm_output_section not the base class. | |
868 | static Arm_output_section<big_endian>* | |
869 | as_arm_output_section(Output_section* os) | |
870 | { return static_cast<Arm_output_section<big_endian>*>(os); } | |
871 | ||
872 | private: | |
873 | // For convenience. | |
874 | typedef Output_section::Input_section Input_section; | |
875 | typedef Output_section::Input_section_list Input_section_list; | |
876 | ||
877 | // Create a stub group. | |
878 | void create_stub_group(Input_section_list::const_iterator, | |
879 | Input_section_list::const_iterator, | |
880 | Input_section_list::const_iterator, | |
881 | Target_arm<big_endian>*, | |
882 | std::vector<Output_relaxed_input_section*>*); | |
883 | }; | |
884 | ||
8ffa3667 DK |
885 | // Arm_relobj class. |
886 | ||
887 | template<bool big_endian> | |
888 | class Arm_relobj : public Sized_relobj<32, big_endian> | |
889 | { | |
890 | public: | |
891 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
892 | ||
2ea97941 | 893 | Arm_relobj(const std::string& name, Input_file* input_file, off_t offset, |
8ffa3667 | 894 | const typename elfcpp::Ehdr<32, big_endian>& ehdr) |
2ea97941 | 895 | : Sized_relobj<32, big_endian>(name, input_file, offset, ehdr), |
a0351a69 DK |
896 | stub_tables_(), local_symbol_is_thumb_function_(), |
897 | attributes_section_data_(NULL) | |
8ffa3667 DK |
898 | { } |
899 | ||
900 | ~Arm_relobj() | |
a0351a69 | 901 | { delete this->attributes_section_data_; } |
8ffa3667 DK |
902 | |
903 | // Return the stub table of the SHNDX-th section if there is one. | |
904 | Stub_table<big_endian>* | |
2ea97941 | 905 | stub_table(unsigned int shndx) const |
8ffa3667 | 906 | { |
2ea97941 ILT |
907 | gold_assert(shndx < this->stub_tables_.size()); |
908 | return this->stub_tables_[shndx]; | |
8ffa3667 DK |
909 | } |
910 | ||
911 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. | |
912 | void | |
2ea97941 | 913 | set_stub_table(unsigned int shndx, Stub_table<big_endian>* stub_table) |
8ffa3667 | 914 | { |
2ea97941 ILT |
915 | gold_assert(shndx < this->stub_tables_.size()); |
916 | this->stub_tables_[shndx] = stub_table; | |
8ffa3667 DK |
917 | } |
918 | ||
919 | // Whether a local symbol is a THUMB function. R_SYM is the symbol table | |
920 | // index. This is only valid after do_count_local_symbol is called. | |
921 | bool | |
922 | local_symbol_is_thumb_function(unsigned int r_sym) const | |
923 | { | |
924 | gold_assert(r_sym < this->local_symbol_is_thumb_function_.size()); | |
925 | return this->local_symbol_is_thumb_function_[r_sym]; | |
926 | } | |
927 | ||
928 | // Scan all relocation sections for stub generation. | |
929 | void | |
930 | scan_sections_for_stubs(Target_arm<big_endian>*, const Symbol_table*, | |
931 | const Layout*); | |
932 | ||
933 | // Convert regular input section with index SHNDX to a relaxed section. | |
934 | void | |
2ea97941 | 935 | convert_input_section_to_relaxed_section(unsigned shndx) |
8ffa3667 DK |
936 | { |
937 | // The stubs have relocations and we need to process them after writing | |
938 | // out the stubs. So relocation now must follow section write. | |
2ea97941 | 939 | this->invalidate_section_offset(shndx); |
8ffa3667 DK |
940 | this->set_relocs_must_follow_section_writes(); |
941 | } | |
942 | ||
943 | // Downcast a base pointer to an Arm_relobj pointer. This is | |
944 | // not type-safe but we only use Arm_relobj not the base class. | |
945 | static Arm_relobj<big_endian>* | |
2ea97941 ILT |
946 | as_arm_relobj(Relobj* relobj) |
947 | { return static_cast<Arm_relobj<big_endian>*>(relobj); } | |
8ffa3667 | 948 | |
d5b40221 DK |
949 | // Processor-specific flags in ELF file header. This is valid only after |
950 | // reading symbols. | |
951 | elfcpp::Elf_Word | |
952 | processor_specific_flags() const | |
953 | { return this->processor_specific_flags_; } | |
954 | ||
a0351a69 DK |
955 | // Attribute section data This is the contents of the .ARM.attribute section |
956 | // if there is one. | |
957 | const Attributes_section_data* | |
958 | attributes_section_data() const | |
959 | { return this->attributes_section_data_; } | |
960 | ||
8ffa3667 DK |
961 | protected: |
962 | // Post constructor setup. | |
963 | void | |
964 | do_setup() | |
965 | { | |
966 | // Call parent's setup method. | |
967 | Sized_relobj<32, big_endian>::do_setup(); | |
968 | ||
969 | // Initialize look-up tables. | |
970 | Stub_table_list empty_stub_table_list(this->shnum(), NULL); | |
971 | this->stub_tables_.swap(empty_stub_table_list); | |
972 | } | |
973 | ||
974 | // Count the local symbols. | |
975 | void | |
976 | do_count_local_symbols(Stringpool_template<char>*, | |
977 | Stringpool_template<char>*); | |
978 | ||
979 | void | |
43d12afe | 980 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, |
8ffa3667 DK |
981 | const unsigned char* pshdrs, |
982 | typename Sized_relobj<32, big_endian>::Views* pivews); | |
983 | ||
d5b40221 DK |
984 | // Read the symbol information. |
985 | void | |
986 | do_read_symbols(Read_symbols_data* sd); | |
987 | ||
8ffa3667 DK |
988 | private: |
989 | // List of stub tables. | |
990 | typedef std::vector<Stub_table<big_endian>*> Stub_table_list; | |
991 | Stub_table_list stub_tables_; | |
992 | // Bit vector to tell if a local symbol is a thumb function or not. | |
993 | // This is only valid after do_count_local_symbol is called. | |
994 | std::vector<bool> local_symbol_is_thumb_function_; | |
d5b40221 DK |
995 | // processor-specific flags in ELF file header. |
996 | elfcpp::Elf_Word processor_specific_flags_; | |
a0351a69 DK |
997 | // Object attributes if there is an .ARM.attributes section or NULL. |
998 | Attributes_section_data* attributes_section_data_; | |
d5b40221 DK |
999 | }; |
1000 | ||
1001 | // Arm_dynobj class. | |
1002 | ||
1003 | template<bool big_endian> | |
1004 | class Arm_dynobj : public Sized_dynobj<32, big_endian> | |
1005 | { | |
1006 | public: | |
2ea97941 | 1007 | Arm_dynobj(const std::string& name, Input_file* input_file, off_t offset, |
d5b40221 | 1008 | const elfcpp::Ehdr<32, big_endian>& ehdr) |
2ea97941 ILT |
1009 | : Sized_dynobj<32, big_endian>(name, input_file, offset, ehdr), |
1010 | processor_specific_flags_(0), attributes_section_data_(NULL) | |
d5b40221 DK |
1011 | { } |
1012 | ||
1013 | ~Arm_dynobj() | |
a0351a69 | 1014 | { delete this->attributes_section_data_; } |
d5b40221 DK |
1015 | |
1016 | // Downcast a base pointer to an Arm_relobj pointer. This is | |
1017 | // not type-safe but we only use Arm_relobj not the base class. | |
1018 | static Arm_dynobj<big_endian>* | |
1019 | as_arm_dynobj(Dynobj* dynobj) | |
1020 | { return static_cast<Arm_dynobj<big_endian>*>(dynobj); } | |
1021 | ||
1022 | // Processor-specific flags in ELF file header. This is valid only after | |
1023 | // reading symbols. | |
1024 | elfcpp::Elf_Word | |
1025 | processor_specific_flags() const | |
1026 | { return this->processor_specific_flags_; } | |
1027 | ||
a0351a69 DK |
1028 | // Attributes section data. |
1029 | const Attributes_section_data* | |
1030 | attributes_section_data() const | |
1031 | { return this->attributes_section_data_; } | |
1032 | ||
d5b40221 DK |
1033 | protected: |
1034 | // Read the symbol information. | |
1035 | void | |
1036 | do_read_symbols(Read_symbols_data* sd); | |
1037 | ||
1038 | private: | |
1039 | // processor-specific flags in ELF file header. | |
1040 | elfcpp::Elf_Word processor_specific_flags_; | |
a0351a69 DK |
1041 | // Object attributes if there is an .ARM.attributes section or NULL. |
1042 | Attributes_section_data* attributes_section_data_; | |
8ffa3667 DK |
1043 | }; |
1044 | ||
e9bbb538 DK |
1045 | // Functor to read reloc addends during stub generation. |
1046 | ||
1047 | template<int sh_type, bool big_endian> | |
1048 | struct Stub_addend_reader | |
1049 | { | |
1050 | // Return the addend for a relocation of a particular type. Depending | |
1051 | // on whether this is a REL or RELA relocation, read the addend from a | |
1052 | // view or from a Reloc object. | |
1053 | elfcpp::Elf_types<32>::Elf_Swxword | |
1054 | operator()( | |
1055 | unsigned int /* r_type */, | |
1056 | const unsigned char* /* view */, | |
1057 | const typename Reloc_types<sh_type, | |
ebd95253 | 1058 | 32, big_endian>::Reloc& /* reloc */) const; |
e9bbb538 DK |
1059 | }; |
1060 | ||
1061 | // Specialized Stub_addend_reader for SHT_REL type relocation sections. | |
1062 | ||
1063 | template<bool big_endian> | |
1064 | struct Stub_addend_reader<elfcpp::SHT_REL, big_endian> | |
1065 | { | |
1066 | elfcpp::Elf_types<32>::Elf_Swxword | |
1067 | operator()( | |
1068 | unsigned int, | |
1069 | const unsigned char*, | |
1070 | const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const; | |
1071 | }; | |
1072 | ||
1073 | // Specialized Stub_addend_reader for RELA type relocation sections. | |
1074 | // We currently do not handle RELA type relocation sections but it is trivial | |
1075 | // to implement the addend reader. This is provided for completeness and to | |
1076 | // make it easier to add support for RELA relocation sections in the future. | |
1077 | ||
1078 | template<bool big_endian> | |
1079 | struct Stub_addend_reader<elfcpp::SHT_RELA, big_endian> | |
1080 | { | |
1081 | elfcpp::Elf_types<32>::Elf_Swxword | |
1082 | operator()( | |
1083 | unsigned int, | |
1084 | const unsigned char*, | |
1085 | const typename Reloc_types<elfcpp::SHT_RELA, 32, | |
ebd95253 DK |
1086 | big_endian>::Reloc& reloc) const |
1087 | { return reloc.get_r_addend(); } | |
e9bbb538 DK |
1088 | }; |
1089 | ||
c121c671 DK |
1090 | // Utilities for manipulating integers of up to 32-bits |
1091 | ||
1092 | namespace utils | |
1093 | { | |
1094 | // Sign extend an n-bit unsigned integer stored in an uint32_t into | |
1095 | // an int32_t. NO_BITS must be between 1 to 32. | |
1096 | template<int no_bits> | |
1097 | static inline int32_t | |
1098 | sign_extend(uint32_t bits) | |
1099 | { | |
96d49306 | 1100 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
1101 | if (no_bits == 32) |
1102 | return static_cast<int32_t>(bits); | |
1103 | uint32_t mask = (~((uint32_t) 0)) >> (32 - no_bits); | |
1104 | bits &= mask; | |
1105 | uint32_t top_bit = 1U << (no_bits - 1); | |
1106 | int32_t as_signed = static_cast<int32_t>(bits); | |
1107 | return (bits & top_bit) ? as_signed + (-top_bit * 2) : as_signed; | |
1108 | } | |
1109 | ||
1110 | // Detects overflow of an NO_BITS integer stored in a uint32_t. | |
1111 | template<int no_bits> | |
1112 | static inline bool | |
1113 | has_overflow(uint32_t bits) | |
1114 | { | |
96d49306 | 1115 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
1116 | if (no_bits == 32) |
1117 | return false; | |
1118 | int32_t max = (1 << (no_bits - 1)) - 1; | |
1119 | int32_t min = -(1 << (no_bits - 1)); | |
1120 | int32_t as_signed = static_cast<int32_t>(bits); | |
1121 | return as_signed > max || as_signed < min; | |
1122 | } | |
1123 | ||
5e445df6 ILT |
1124 | // Detects overflow of an NO_BITS integer stored in a uint32_t when it |
1125 | // fits in the given number of bits as either a signed or unsigned value. | |
1126 | // For example, has_signed_unsigned_overflow<8> would check | |
1127 | // -128 <= bits <= 255 | |
1128 | template<int no_bits> | |
1129 | static inline bool | |
1130 | has_signed_unsigned_overflow(uint32_t bits) | |
1131 | { | |
1132 | gold_assert(no_bits >= 2 && no_bits <= 32); | |
1133 | if (no_bits == 32) | |
1134 | return false; | |
1135 | int32_t max = static_cast<int32_t>((1U << no_bits) - 1); | |
1136 | int32_t min = -(1 << (no_bits - 1)); | |
1137 | int32_t as_signed = static_cast<int32_t>(bits); | |
1138 | return as_signed > max || as_signed < min; | |
1139 | } | |
1140 | ||
c121c671 DK |
1141 | // Select bits from A and B using bits in MASK. For each n in [0..31], |
1142 | // the n-th bit in the result is chosen from the n-th bits of A and B. | |
1143 | // A zero selects A and a one selects B. | |
1144 | static inline uint32_t | |
1145 | bit_select(uint32_t a, uint32_t b, uint32_t mask) | |
1146 | { return (a & ~mask) | (b & mask); } | |
1147 | }; | |
1148 | ||
4a657b0d DK |
1149 | template<bool big_endian> |
1150 | class Target_arm : public Sized_target<32, big_endian> | |
1151 | { | |
1152 | public: | |
1153 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
1154 | Reloc_section; | |
1155 | ||
2daedcd6 DK |
1156 | // When were are relocating a stub, we pass this as the relocation number. |
1157 | static const size_t fake_relnum_for_stubs = static_cast<size_t>(-1); | |
1158 | ||
a6d1ef57 DK |
1159 | Target_arm() |
1160 | : Sized_target<32, big_endian>(&arm_info), | |
1161 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), | |
1162 | copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL), stub_tables_(), | |
a0351a69 DK |
1163 | stub_factory_(Stub_factory::get_instance()), may_use_blx_(false), |
1164 | should_force_pic_veneer_(false), arm_input_section_map_(), | |
1165 | attributes_section_data_(NULL) | |
a6d1ef57 | 1166 | { } |
4a657b0d | 1167 | |
b569affa DK |
1168 | // Whether we can use BLX. |
1169 | bool | |
1170 | may_use_blx() const | |
1171 | { return this->may_use_blx_; } | |
1172 | ||
1173 | // Set use-BLX flag. | |
1174 | void | |
1175 | set_may_use_blx(bool value) | |
1176 | { this->may_use_blx_ = value; } | |
1177 | ||
1178 | // Whether we force PCI branch veneers. | |
1179 | bool | |
1180 | should_force_pic_veneer() const | |
1181 | { return this->should_force_pic_veneer_; } | |
1182 | ||
1183 | // Set PIC veneer flag. | |
1184 | void | |
1185 | set_should_force_pic_veneer(bool value) | |
1186 | { this->should_force_pic_veneer_ = value; } | |
1187 | ||
1188 | // Whether we use THUMB-2 instructions. | |
1189 | bool | |
1190 | using_thumb2() const | |
1191 | { | |
a0351a69 DK |
1192 | Object_attribute* attr = |
1193 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1194 | int arch = attr->int_value(); | |
1195 | return arch == elfcpp::TAG_CPU_ARCH_V6T2 || arch >= elfcpp::TAG_CPU_ARCH_V7; | |
b569affa DK |
1196 | } |
1197 | ||
1198 | // Whether we use THUMB/THUMB-2 instructions only. | |
1199 | bool | |
1200 | using_thumb_only() const | |
1201 | { | |
a0351a69 DK |
1202 | Object_attribute* attr = |
1203 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1204 | if (attr->int_value() != elfcpp::TAG_CPU_ARCH_V7 | |
1205 | && attr->int_value() != elfcpp::TAG_CPU_ARCH_V7E_M) | |
1206 | return false; | |
1207 | attr = this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile); | |
1208 | return attr->int_value() == 'M'; | |
b569affa DK |
1209 | } |
1210 | ||
d204b6e9 DK |
1211 | // Whether we have an NOP instruction. If not, use mov r0, r0 instead. |
1212 | bool | |
1213 | may_use_arm_nop() const | |
1214 | { | |
a0351a69 DK |
1215 | Object_attribute* attr = |
1216 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1217 | int arch = attr->int_value(); | |
1218 | return (arch == elfcpp::TAG_CPU_ARCH_V6T2 | |
1219 | || arch == elfcpp::TAG_CPU_ARCH_V6K | |
1220 | || arch == elfcpp::TAG_CPU_ARCH_V7 | |
1221 | || arch == elfcpp::TAG_CPU_ARCH_V7E_M); | |
d204b6e9 DK |
1222 | } |
1223 | ||
51938283 DK |
1224 | // Whether we have THUMB-2 NOP.W instruction. |
1225 | bool | |
1226 | may_use_thumb2_nop() const | |
1227 | { | |
a0351a69 DK |
1228 | Object_attribute* attr = |
1229 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1230 | int arch = attr->int_value(); | |
1231 | return (arch == elfcpp::TAG_CPU_ARCH_V6T2 | |
1232 | || arch == elfcpp::TAG_CPU_ARCH_V7 | |
1233 | || arch == elfcpp::TAG_CPU_ARCH_V7E_M); | |
51938283 DK |
1234 | } |
1235 | ||
4a657b0d DK |
1236 | // Process the relocations to determine unreferenced sections for |
1237 | // garbage collection. | |
1238 | void | |
ad0f2072 | 1239 | gc_process_relocs(Symbol_table* symtab, |
4a657b0d DK |
1240 | Layout* layout, |
1241 | Sized_relobj<32, big_endian>* object, | |
1242 | unsigned int data_shndx, | |
1243 | unsigned int sh_type, | |
1244 | const unsigned char* prelocs, | |
1245 | size_t reloc_count, | |
1246 | Output_section* output_section, | |
1247 | bool needs_special_offset_handling, | |
1248 | size_t local_symbol_count, | |
1249 | const unsigned char* plocal_symbols); | |
1250 | ||
1251 | // Scan the relocations to look for symbol adjustments. | |
1252 | void | |
ad0f2072 | 1253 | scan_relocs(Symbol_table* symtab, |
4a657b0d DK |
1254 | Layout* layout, |
1255 | Sized_relobj<32, big_endian>* object, | |
1256 | unsigned int data_shndx, | |
1257 | unsigned int sh_type, | |
1258 | const unsigned char* prelocs, | |
1259 | size_t reloc_count, | |
1260 | Output_section* output_section, | |
1261 | bool needs_special_offset_handling, | |
1262 | size_t local_symbol_count, | |
1263 | const unsigned char* plocal_symbols); | |
1264 | ||
1265 | // Finalize the sections. | |
1266 | void | |
f59f41f3 | 1267 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
4a657b0d | 1268 | |
94cdfcff | 1269 | // Return the value to use for a dynamic symbol which requires special |
4a657b0d DK |
1270 | // treatment. |
1271 | uint64_t | |
1272 | do_dynsym_value(const Symbol*) const; | |
1273 | ||
1274 | // Relocate a section. | |
1275 | void | |
1276 | relocate_section(const Relocate_info<32, big_endian>*, | |
1277 | unsigned int sh_type, | |
1278 | const unsigned char* prelocs, | |
1279 | size_t reloc_count, | |
1280 | Output_section* output_section, | |
1281 | bool needs_special_offset_handling, | |
1282 | unsigned char* view, | |
ebabffbd | 1283 | Arm_address view_address, |
364c7fa5 ILT |
1284 | section_size_type view_size, |
1285 | const Reloc_symbol_changes*); | |
4a657b0d DK |
1286 | |
1287 | // Scan the relocs during a relocatable link. | |
1288 | void | |
ad0f2072 | 1289 | scan_relocatable_relocs(Symbol_table* symtab, |
4a657b0d DK |
1290 | Layout* layout, |
1291 | Sized_relobj<32, big_endian>* object, | |
1292 | unsigned int data_shndx, | |
1293 | unsigned int sh_type, | |
1294 | const unsigned char* prelocs, | |
1295 | size_t reloc_count, | |
1296 | Output_section* output_section, | |
1297 | bool needs_special_offset_handling, | |
1298 | size_t local_symbol_count, | |
1299 | const unsigned char* plocal_symbols, | |
1300 | Relocatable_relocs*); | |
1301 | ||
1302 | // Relocate a section during a relocatable link. | |
1303 | void | |
1304 | relocate_for_relocatable(const Relocate_info<32, big_endian>*, | |
1305 | unsigned int sh_type, | |
1306 | const unsigned char* prelocs, | |
1307 | size_t reloc_count, | |
1308 | Output_section* output_section, | |
1309 | off_t offset_in_output_section, | |
1310 | const Relocatable_relocs*, | |
1311 | unsigned char* view, | |
ebabffbd | 1312 | Arm_address view_address, |
4a657b0d DK |
1313 | section_size_type view_size, |
1314 | unsigned char* reloc_view, | |
1315 | section_size_type reloc_view_size); | |
1316 | ||
1317 | // Return whether SYM is defined by the ABI. | |
1318 | bool | |
1319 | do_is_defined_by_abi(Symbol* sym) const | |
1320 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
1321 | ||
94cdfcff DK |
1322 | // Return the size of the GOT section. |
1323 | section_size_type | |
1324 | got_size() | |
1325 | { | |
1326 | gold_assert(this->got_ != NULL); | |
1327 | return this->got_->data_size(); | |
1328 | } | |
1329 | ||
4a657b0d | 1330 | // Map platform-specific reloc types |
a6d1ef57 DK |
1331 | static unsigned int |
1332 | get_real_reloc_type (unsigned int r_type); | |
4a657b0d | 1333 | |
55da9579 DK |
1334 | // |
1335 | // Methods to support stub-generations. | |
1336 | // | |
1337 | ||
1338 | // Return the stub factory | |
1339 | const Stub_factory& | |
1340 | stub_factory() const | |
1341 | { return this->stub_factory_; } | |
1342 | ||
1343 | // Make a new Arm_input_section object. | |
1344 | Arm_input_section<big_endian>* | |
1345 | new_arm_input_section(Relobj*, unsigned int); | |
1346 | ||
1347 | // Find the Arm_input_section object corresponding to the SHNDX-th input | |
1348 | // section of RELOBJ. | |
1349 | Arm_input_section<big_endian>* | |
2ea97941 | 1350 | find_arm_input_section(Relobj* relobj, unsigned int shndx) const; |
55da9579 DK |
1351 | |
1352 | // Make a new Stub_table | |
1353 | Stub_table<big_endian>* | |
1354 | new_stub_table(Arm_input_section<big_endian>*); | |
1355 | ||
eb44217c DK |
1356 | // Scan a section for stub generation. |
1357 | void | |
1358 | scan_section_for_stubs(const Relocate_info<32, big_endian>*, unsigned int, | |
1359 | const unsigned char*, size_t, Output_section*, | |
1360 | bool, const unsigned char*, Arm_address, | |
1361 | section_size_type); | |
1362 | ||
43d12afe DK |
1363 | // Relocate a stub. |
1364 | void | |
1365 | relocate_stub(Reloc_stub*, const Relocate_info<32, big_endian>*, | |
1366 | Output_section*, unsigned char*, Arm_address, | |
1367 | section_size_type); | |
1368 | ||
b569affa | 1369 | // Get the default ARM target. |
43d12afe | 1370 | static Target_arm<big_endian>* |
b569affa DK |
1371 | default_target() |
1372 | { | |
1373 | gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM | |
1374 | && parameters->target().is_big_endian() == big_endian); | |
43d12afe DK |
1375 | return static_cast<Target_arm<big_endian>*>( |
1376 | parameters->sized_target<32, big_endian>()); | |
b569affa DK |
1377 | } |
1378 | ||
55da9579 DK |
1379 | // Whether relocation type uses LSB to distinguish THUMB addresses. |
1380 | static bool | |
1381 | reloc_uses_thumb_bit(unsigned int r_type); | |
1382 | ||
d5b40221 | 1383 | protected: |
eb44217c DK |
1384 | // Make an ELF object. |
1385 | Object* | |
1386 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1387 | const elfcpp::Ehdr<32, big_endian>& ehdr); | |
1388 | ||
1389 | Object* | |
1390 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1391 | const elfcpp::Ehdr<32, !big_endian>&) | |
1392 | { gold_unreachable(); } | |
1393 | ||
1394 | Object* | |
1395 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1396 | const elfcpp::Ehdr<64, false>&) | |
1397 | { gold_unreachable(); } | |
1398 | ||
1399 | Object* | |
1400 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1401 | const elfcpp::Ehdr<64, true>&) | |
1402 | { gold_unreachable(); } | |
1403 | ||
1404 | // Make an output section. | |
1405 | Output_section* | |
1406 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
1407 | elfcpp::Elf_Xword flags) | |
1408 | { return new Arm_output_section<big_endian>(name, type, flags); } | |
1409 | ||
d5b40221 DK |
1410 | void |
1411 | do_adjust_elf_header(unsigned char* view, int len) const; | |
1412 | ||
eb44217c DK |
1413 | // We only need to generate stubs, and hence perform relaxation if we are |
1414 | // not doing relocatable linking. | |
1415 | bool | |
1416 | do_may_relax() const | |
1417 | { return !parameters->options().relocatable(); } | |
1418 | ||
1419 | bool | |
1420 | do_relax(int, const Input_objects*, Symbol_table*, Layout*); | |
1421 | ||
a0351a69 DK |
1422 | // Determine whether an object attribute tag takes an integer, a |
1423 | // string or both. | |
1424 | int | |
1425 | do_attribute_arg_type(int tag) const; | |
1426 | ||
1427 | // Reorder tags during output. | |
1428 | int | |
1429 | do_attributes_order(int num) const; | |
1430 | ||
4a657b0d DK |
1431 | private: |
1432 | // The class which scans relocations. | |
1433 | class Scan | |
1434 | { | |
1435 | public: | |
1436 | Scan() | |
bec53400 | 1437 | : issued_non_pic_error_(false) |
4a657b0d DK |
1438 | { } |
1439 | ||
1440 | inline void | |
ad0f2072 | 1441 | local(Symbol_table* symtab, Layout* layout, Target_arm* target, |
4a657b0d DK |
1442 | Sized_relobj<32, big_endian>* object, |
1443 | unsigned int data_shndx, | |
1444 | Output_section* output_section, | |
1445 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1446 | const elfcpp::Sym<32, big_endian>& lsym); | |
1447 | ||
1448 | inline void | |
ad0f2072 | 1449 | global(Symbol_table* symtab, Layout* layout, Target_arm* target, |
4a657b0d DK |
1450 | Sized_relobj<32, big_endian>* object, |
1451 | unsigned int data_shndx, | |
1452 | Output_section* output_section, | |
1453 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1454 | Symbol* gsym); | |
1455 | ||
1456 | private: | |
1457 | static void | |
1458 | unsupported_reloc_local(Sized_relobj<32, big_endian>*, | |
1459 | unsigned int r_type); | |
1460 | ||
1461 | static void | |
1462 | unsupported_reloc_global(Sized_relobj<32, big_endian>*, | |
1463 | unsigned int r_type, Symbol*); | |
bec53400 DK |
1464 | |
1465 | void | |
1466 | check_non_pic(Relobj*, unsigned int r_type); | |
1467 | ||
1468 | // Almost identical to Symbol::needs_plt_entry except that it also | |
1469 | // handles STT_ARM_TFUNC. | |
1470 | static bool | |
1471 | symbol_needs_plt_entry(const Symbol* sym) | |
1472 | { | |
1473 | // An undefined symbol from an executable does not need a PLT entry. | |
1474 | if (sym->is_undefined() && !parameters->options().shared()) | |
1475 | return false; | |
1476 | ||
1477 | return (!parameters->doing_static_link() | |
1478 | && (sym->type() == elfcpp::STT_FUNC | |
1479 | || sym->type() == elfcpp::STT_ARM_TFUNC) | |
1480 | && (sym->is_from_dynobj() | |
1481 | || sym->is_undefined() | |
1482 | || sym->is_preemptible())); | |
1483 | } | |
1484 | ||
1485 | // Whether we have issued an error about a non-PIC compilation. | |
1486 | bool issued_non_pic_error_; | |
4a657b0d DK |
1487 | }; |
1488 | ||
1489 | // The class which implements relocation. | |
1490 | class Relocate | |
1491 | { | |
1492 | public: | |
1493 | Relocate() | |
1494 | { } | |
1495 | ||
1496 | ~Relocate() | |
1497 | { } | |
1498 | ||
bec53400 DK |
1499 | // Return whether the static relocation needs to be applied. |
1500 | inline bool | |
1501 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
1502 | int ref_flags, | |
1503 | bool is_32bit, | |
1504 | Output_section* output_section); | |
1505 | ||
4a657b0d DK |
1506 | // Do a relocation. Return false if the caller should not issue |
1507 | // any warnings about this relocation. | |
1508 | inline bool | |
1509 | relocate(const Relocate_info<32, big_endian>*, Target_arm*, | |
1510 | Output_section*, size_t relnum, | |
1511 | const elfcpp::Rel<32, big_endian>&, | |
1512 | unsigned int r_type, const Sized_symbol<32>*, | |
1513 | const Symbol_value<32>*, | |
ebabffbd | 1514 | unsigned char*, Arm_address, |
4a657b0d | 1515 | section_size_type); |
c121c671 DK |
1516 | |
1517 | // Return whether we want to pass flag NON_PIC_REF for this | |
f4e5969c DK |
1518 | // reloc. This means the relocation type accesses a symbol not via |
1519 | // GOT or PLT. | |
c121c671 DK |
1520 | static inline bool |
1521 | reloc_is_non_pic (unsigned int r_type) | |
1522 | { | |
1523 | switch (r_type) | |
1524 | { | |
f4e5969c DK |
1525 | // These relocation types reference GOT or PLT entries explicitly. |
1526 | case elfcpp::R_ARM_GOT_BREL: | |
1527 | case elfcpp::R_ARM_GOT_ABS: | |
1528 | case elfcpp::R_ARM_GOT_PREL: | |
1529 | case elfcpp::R_ARM_GOT_BREL12: | |
1530 | case elfcpp::R_ARM_PLT32_ABS: | |
1531 | case elfcpp::R_ARM_TLS_GD32: | |
1532 | case elfcpp::R_ARM_TLS_LDM32: | |
1533 | case elfcpp::R_ARM_TLS_IE32: | |
1534 | case elfcpp::R_ARM_TLS_IE12GP: | |
1535 | ||
1536 | // These relocate types may use PLT entries. | |
c121c671 | 1537 | case elfcpp::R_ARM_CALL: |
f4e5969c | 1538 | case elfcpp::R_ARM_THM_CALL: |
c121c671 | 1539 | case elfcpp::R_ARM_JUMP24: |
f4e5969c DK |
1540 | case elfcpp::R_ARM_THM_JUMP24: |
1541 | case elfcpp::R_ARM_THM_JUMP19: | |
1542 | case elfcpp::R_ARM_PLT32: | |
1543 | case elfcpp::R_ARM_THM_XPC22: | |
c121c671 | 1544 | return false; |
f4e5969c DK |
1545 | |
1546 | default: | |
1547 | return true; | |
c121c671 DK |
1548 | } |
1549 | } | |
4a657b0d DK |
1550 | }; |
1551 | ||
1552 | // A class which returns the size required for a relocation type, | |
1553 | // used while scanning relocs during a relocatable link. | |
1554 | class Relocatable_size_for_reloc | |
1555 | { | |
1556 | public: | |
1557 | unsigned int | |
1558 | get_size_for_reloc(unsigned int, Relobj*); | |
1559 | }; | |
1560 | ||
94cdfcff DK |
1561 | // Get the GOT section, creating it if necessary. |
1562 | Output_data_got<32, big_endian>* | |
1563 | got_section(Symbol_table*, Layout*); | |
1564 | ||
1565 | // Get the GOT PLT section. | |
1566 | Output_data_space* | |
1567 | got_plt_section() const | |
1568 | { | |
1569 | gold_assert(this->got_plt_ != NULL); | |
1570 | return this->got_plt_; | |
1571 | } | |
1572 | ||
1573 | // Create a PLT entry for a global symbol. | |
1574 | void | |
1575 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1576 | ||
1577 | // Get the PLT section. | |
1578 | const Output_data_plt_arm<big_endian>* | |
1579 | plt_section() const | |
1580 | { | |
1581 | gold_assert(this->plt_ != NULL); | |
1582 | return this->plt_; | |
1583 | } | |
1584 | ||
1585 | // Get the dynamic reloc section, creating it if necessary. | |
1586 | Reloc_section* | |
1587 | rel_dyn_section(Layout*); | |
1588 | ||
1589 | // Return true if the symbol may need a COPY relocation. | |
1590 | // References from an executable object to non-function symbols | |
1591 | // defined in a dynamic object may need a COPY relocation. | |
1592 | bool | |
1593 | may_need_copy_reloc(Symbol* gsym) | |
1594 | { | |
966d4097 DK |
1595 | return (gsym->type() != elfcpp::STT_ARM_TFUNC |
1596 | && gsym->may_need_copy_reloc()); | |
94cdfcff DK |
1597 | } |
1598 | ||
1599 | // Add a potential copy relocation. | |
1600 | void | |
1601 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
1602 | Sized_relobj<32, big_endian>* object, | |
2ea97941 | 1603 | unsigned int shndx, Output_section* output_section, |
94cdfcff DK |
1604 | Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc) |
1605 | { | |
1606 | this->copy_relocs_.copy_reloc(symtab, layout, | |
1607 | symtab->get_sized_symbol<32>(sym), | |
2ea97941 | 1608 | object, shndx, output_section, reloc, |
94cdfcff DK |
1609 | this->rel_dyn_section(layout)); |
1610 | } | |
1611 | ||
d5b40221 DK |
1612 | // Whether two EABI versions are compatible. |
1613 | static bool | |
1614 | are_eabi_versions_compatible(elfcpp::Elf_Word v1, elfcpp::Elf_Word v2); | |
1615 | ||
1616 | // Merge processor-specific flags from input object and those in the ELF | |
1617 | // header of the output. | |
1618 | void | |
1619 | merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word); | |
1620 | ||
a0351a69 DK |
1621 | // Get the secondary compatible architecture. |
1622 | static int | |
1623 | get_secondary_compatible_arch(const Attributes_section_data*); | |
1624 | ||
1625 | // Set the secondary compatible architecture. | |
1626 | static void | |
1627 | set_secondary_compatible_arch(Attributes_section_data*, int); | |
1628 | ||
1629 | static int | |
1630 | tag_cpu_arch_combine(const char*, int, int*, int, int); | |
1631 | ||
1632 | // Helper to print AEABI enum tag value. | |
1633 | static std::string | |
1634 | aeabi_enum_name(unsigned int); | |
1635 | ||
1636 | // Return string value for TAG_CPU_name. | |
1637 | static std::string | |
1638 | tag_cpu_name_value(unsigned int); | |
1639 | ||
1640 | // Merge object attributes from input object and those in the output. | |
1641 | void | |
1642 | merge_object_attributes(const char*, const Attributes_section_data*); | |
1643 | ||
1644 | // Helper to get an AEABI object attribute | |
1645 | Object_attribute* | |
1646 | get_aeabi_object_attribute(int tag) const | |
1647 | { | |
1648 | Attributes_section_data* pasd = this->attributes_section_data_; | |
1649 | gold_assert(pasd != NULL); | |
1650 | Object_attribute* attr = | |
1651 | pasd->get_attribute(Object_attribute::OBJ_ATTR_PROC, tag); | |
1652 | gold_assert(attr != NULL); | |
1653 | return attr; | |
1654 | } | |
1655 | ||
eb44217c DK |
1656 | // |
1657 | // Methods to support stub-generations. | |
1658 | // | |
d5b40221 | 1659 | |
eb44217c DK |
1660 | // Group input sections for stub generation. |
1661 | void | |
1662 | group_sections(Layout*, section_size_type, bool); | |
d5b40221 | 1663 | |
eb44217c DK |
1664 | // Scan a relocation for stub generation. |
1665 | void | |
1666 | scan_reloc_for_stub(const Relocate_info<32, big_endian>*, unsigned int, | |
1667 | const Sized_symbol<32>*, unsigned int, | |
1668 | const Symbol_value<32>*, | |
1669 | elfcpp::Elf_types<32>::Elf_Swxword, Arm_address); | |
d5b40221 | 1670 | |
eb44217c DK |
1671 | // Scan a relocation section for stub. |
1672 | template<int sh_type> | |
1673 | void | |
1674 | scan_reloc_section_for_stubs( | |
1675 | const Relocate_info<32, big_endian>* relinfo, | |
1676 | const unsigned char* prelocs, | |
1677 | size_t reloc_count, | |
1678 | Output_section* output_section, | |
1679 | bool needs_special_offset_handling, | |
1680 | const unsigned char* view, | |
1681 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
1682 | section_size_type); | |
d5b40221 | 1683 | |
4a657b0d DK |
1684 | // Information about this specific target which we pass to the |
1685 | // general Target structure. | |
1686 | static const Target::Target_info arm_info; | |
94cdfcff DK |
1687 | |
1688 | // The types of GOT entries needed for this platform. | |
1689 | enum Got_type | |
1690 | { | |
1691 | GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol | |
1692 | }; | |
1693 | ||
55da9579 DK |
1694 | typedef typename std::vector<Stub_table<big_endian>*> Stub_table_list; |
1695 | ||
1696 | // Map input section to Arm_input_section. | |
1697 | typedef Unordered_map<Input_section_specifier, | |
1698 | Arm_input_section<big_endian>*, | |
1699 | Input_section_specifier::hash, | |
1700 | Input_section_specifier::equal_to> | |
1701 | Arm_input_section_map; | |
1702 | ||
94cdfcff DK |
1703 | // The GOT section. |
1704 | Output_data_got<32, big_endian>* got_; | |
1705 | // The PLT section. | |
1706 | Output_data_plt_arm<big_endian>* plt_; | |
1707 | // The GOT PLT section. | |
1708 | Output_data_space* got_plt_; | |
1709 | // The dynamic reloc section. | |
1710 | Reloc_section* rel_dyn_; | |
1711 | // Relocs saved to avoid a COPY reloc. | |
1712 | Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_; | |
1713 | // Space for variables copied with a COPY reloc. | |
1714 | Output_data_space* dynbss_; | |
55da9579 DK |
1715 | // Vector of Stub_tables created. |
1716 | Stub_table_list stub_tables_; | |
1717 | // Stub factory. | |
1718 | const Stub_factory &stub_factory_; | |
b569affa DK |
1719 | // Whether we can use BLX. |
1720 | bool may_use_blx_; | |
1721 | // Whether we force PIC branch veneers. | |
1722 | bool should_force_pic_veneer_; | |
eb44217c DK |
1723 | // Map for locating Arm_input_sections. |
1724 | Arm_input_section_map arm_input_section_map_; | |
a0351a69 DK |
1725 | // Attributes section data in output. |
1726 | Attributes_section_data* attributes_section_data_; | |
4a657b0d DK |
1727 | }; |
1728 | ||
1729 | template<bool big_endian> | |
1730 | const Target::Target_info Target_arm<big_endian>::arm_info = | |
1731 | { | |
1732 | 32, // size | |
1733 | big_endian, // is_big_endian | |
1734 | elfcpp::EM_ARM, // machine_code | |
1735 | false, // has_make_symbol | |
1736 | false, // has_resolve | |
1737 | false, // has_code_fill | |
1738 | true, // is_default_stack_executable | |
1739 | '\0', // wrap_char | |
1740 | "/usr/lib/libc.so.1", // dynamic_linker | |
1741 | 0x8000, // default_text_segment_address | |
1742 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
1743 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
1744 | elfcpp::SHN_UNDEF, // small_common_shndx | |
1745 | elfcpp::SHN_UNDEF, // large_common_shndx | |
1746 | 0, // small_common_section_flags | |
05a352e6 DK |
1747 | 0, // large_common_section_flags |
1748 | ".ARM.attributes", // attributes_section | |
1749 | "aeabi" // attributes_vendor | |
4a657b0d DK |
1750 | }; |
1751 | ||
c121c671 DK |
1752 | // Arm relocate functions class |
1753 | // | |
1754 | ||
1755 | template<bool big_endian> | |
1756 | class Arm_relocate_functions : public Relocate_functions<32, big_endian> | |
1757 | { | |
1758 | public: | |
1759 | typedef enum | |
1760 | { | |
1761 | STATUS_OKAY, // No error during relocation. | |
1762 | STATUS_OVERFLOW, // Relocation oveflow. | |
1763 | STATUS_BAD_RELOC // Relocation cannot be applied. | |
1764 | } Status; | |
1765 | ||
1766 | private: | |
1767 | typedef Relocate_functions<32, big_endian> Base; | |
1768 | typedef Arm_relocate_functions<big_endian> This; | |
1769 | ||
fd3c5f0b ILT |
1770 | // Encoding of imm16 argument for movt and movw ARM instructions |
1771 | // from ARM ARM: | |
1772 | // | |
1773 | // imm16 := imm4 | imm12 | |
1774 | // | |
1775 | // 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 | |
1776 | // +-------+---------------+-------+-------+-----------------------+ | |
1777 | // | | |imm4 | |imm12 | | |
1778 | // +-------+---------------+-------+-------+-----------------------+ | |
1779 | ||
1780 | // Extract the relocation addend from VAL based on the ARM | |
1781 | // instruction encoding described above. | |
1782 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1783 | extract_arm_movw_movt_addend( | |
1784 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1785 | { | |
1786 | // According to the Elf ABI for ARM Architecture the immediate | |
1787 | // field is sign-extended to form the addend. | |
1788 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | (val & 0xfff)); | |
1789 | } | |
1790 | ||
1791 | // Insert X into VAL based on the ARM instruction encoding described | |
1792 | // above. | |
1793 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1794 | insert_val_arm_movw_movt( | |
1795 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1796 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1797 | { | |
1798 | val &= 0xfff0f000; | |
1799 | val |= x & 0x0fff; | |
1800 | val |= (x & 0xf000) << 4; | |
1801 | return val; | |
1802 | } | |
1803 | ||
1804 | // Encoding of imm16 argument for movt and movw Thumb2 instructions | |
1805 | // from ARM ARM: | |
1806 | // | |
1807 | // imm16 := imm4 | i | imm3 | imm8 | |
1808 | // | |
1809 | // 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 | |
1810 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
1811 | // | |i| |imm4 || |imm3 | |imm8 | | |
1812 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
1813 | ||
1814 | // Extract the relocation addend from VAL based on the Thumb2 | |
1815 | // instruction encoding described above. | |
1816 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1817 | extract_thumb_movw_movt_addend( | |
1818 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1819 | { | |
1820 | // According to the Elf ABI for ARM Architecture the immediate | |
1821 | // field is sign-extended to form the addend. | |
1822 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | |
1823 | | ((val >> 15) & 0x0800) | |
1824 | | ((val >> 4) & 0x0700) | |
1825 | | (val & 0x00ff)); | |
1826 | } | |
1827 | ||
1828 | // Insert X into VAL based on the Thumb2 instruction encoding | |
1829 | // described above. | |
1830 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1831 | insert_val_thumb_movw_movt( | |
1832 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1833 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1834 | { | |
1835 | val &= 0xfbf08f00; | |
1836 | val |= (x & 0xf000) << 4; | |
1837 | val |= (x & 0x0800) << 15; | |
1838 | val |= (x & 0x0700) << 4; | |
1839 | val |= (x & 0x00ff); | |
1840 | return val; | |
1841 | } | |
1842 | ||
d204b6e9 DK |
1843 | // Handle ARM long branches. |
1844 | static typename This::Status | |
1845 | arm_branch_common(unsigned int, const Relocate_info<32, big_endian>*, | |
1846 | unsigned char *, const Sized_symbol<32>*, | |
1847 | const Arm_relobj<big_endian>*, unsigned int, | |
1848 | const Symbol_value<32>*, Arm_address, Arm_address, bool); | |
c121c671 | 1849 | |
51938283 DK |
1850 | // Handle THUMB long branches. |
1851 | static typename This::Status | |
1852 | thumb_branch_common(unsigned int, const Relocate_info<32, big_endian>*, | |
1853 | unsigned char *, const Sized_symbol<32>*, | |
1854 | const Arm_relobj<big_endian>*, unsigned int, | |
1855 | const Symbol_value<32>*, Arm_address, Arm_address, bool); | |
1856 | ||
c121c671 | 1857 | public: |
5e445df6 ILT |
1858 | |
1859 | // R_ARM_ABS8: S + A | |
1860 | static inline typename This::Status | |
1861 | abs8(unsigned char *view, | |
1862 | const Sized_relobj<32, big_endian>* object, | |
be8fcb75 | 1863 | const Symbol_value<32>* psymval) |
5e445df6 ILT |
1864 | { |
1865 | typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype; | |
1866 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1867 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1868 | Valtype val = elfcpp::Swap<8, big_endian>::readval(wv); | |
1869 | Reltype addend = utils::sign_extend<8>(val); | |
2daedcd6 | 1870 | Reltype x = psymval->value(object, addend); |
5e445df6 ILT |
1871 | val = utils::bit_select(val, x, 0xffU); |
1872 | elfcpp::Swap<8, big_endian>::writeval(wv, val); | |
1873 | return (utils::has_signed_unsigned_overflow<8>(x) | |
1874 | ? This::STATUS_OVERFLOW | |
1875 | : This::STATUS_OKAY); | |
1876 | } | |
1877 | ||
be8fcb75 ILT |
1878 | // R_ARM_THM_ABS5: S + A |
1879 | static inline typename This::Status | |
1880 | thm_abs5(unsigned char *view, | |
1881 | const Sized_relobj<32, big_endian>* object, | |
1882 | const Symbol_value<32>* psymval) | |
1883 | { | |
1884 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1885 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1886 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1887 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
1888 | Reltype addend = (val & 0x7e0U) >> 6; | |
2daedcd6 | 1889 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
1890 | val = utils::bit_select(val, x << 6, 0x7e0U); |
1891 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
1892 | return (utils::has_overflow<5>(x) | |
1893 | ? This::STATUS_OVERFLOW | |
1894 | : This::STATUS_OKAY); | |
1895 | } | |
1896 | ||
1897 | // R_ARM_ABS12: S + A | |
1898 | static inline typename This::Status | |
1899 | abs12(unsigned char *view, | |
51938283 DK |
1900 | const Sized_relobj<32, big_endian>* object, |
1901 | const Symbol_value<32>* psymval) | |
be8fcb75 ILT |
1902 | { |
1903 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1904 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1905 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1906 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
1907 | Reltype addend = val & 0x0fffU; | |
2daedcd6 | 1908 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
1909 | val = utils::bit_select(val, x, 0x0fffU); |
1910 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
1911 | return (utils::has_overflow<12>(x) | |
1912 | ? This::STATUS_OVERFLOW | |
1913 | : This::STATUS_OKAY); | |
1914 | } | |
1915 | ||
1916 | // R_ARM_ABS16: S + A | |
1917 | static inline typename This::Status | |
1918 | abs16(unsigned char *view, | |
51938283 DK |
1919 | const Sized_relobj<32, big_endian>* object, |
1920 | const Symbol_value<32>* psymval) | |
be8fcb75 ILT |
1921 | { |
1922 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
1923 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
1924 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1925 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
1926 | Reltype addend = utils::sign_extend<16>(val); | |
2daedcd6 | 1927 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
1928 | val = utils::bit_select(val, x, 0xffffU); |
1929 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
1930 | return (utils::has_signed_unsigned_overflow<16>(x) | |
1931 | ? This::STATUS_OVERFLOW | |
1932 | : This::STATUS_OKAY); | |
1933 | } | |
1934 | ||
c121c671 DK |
1935 | // R_ARM_ABS32: (S + A) | T |
1936 | static inline typename This::Status | |
1937 | abs32(unsigned char *view, | |
1938 | const Sized_relobj<32, big_endian>* object, | |
1939 | const Symbol_value<32>* psymval, | |
2daedcd6 | 1940 | Arm_address thumb_bit) |
c121c671 DK |
1941 | { |
1942 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1943 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1944 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
2daedcd6 | 1945 | Valtype x = psymval->value(object, addend) | thumb_bit; |
c121c671 DK |
1946 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
1947 | return This::STATUS_OKAY; | |
1948 | } | |
1949 | ||
1950 | // R_ARM_REL32: (S + A) | T - P | |
1951 | static inline typename This::Status | |
1952 | rel32(unsigned char *view, | |
1953 | const Sized_relobj<32, big_endian>* object, | |
1954 | const Symbol_value<32>* psymval, | |
ebabffbd | 1955 | Arm_address address, |
2daedcd6 | 1956 | Arm_address thumb_bit) |
c121c671 DK |
1957 | { |
1958 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
1959 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
1960 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
2daedcd6 | 1961 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c121c671 DK |
1962 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
1963 | return This::STATUS_OKAY; | |
1964 | } | |
1965 | ||
1966 | // R_ARM_THM_CALL: (S + A) | T - P | |
1967 | static inline typename This::Status | |
51938283 DK |
1968 | thm_call(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, |
1969 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
1970 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
1971 | Arm_address address, Arm_address thumb_bit, | |
1972 | bool is_weakly_undefined_without_plt) | |
c121c671 | 1973 | { |
51938283 DK |
1974 | return thumb_branch_common(elfcpp::R_ARM_THM_CALL, relinfo, view, gsym, |
1975 | object, r_sym, psymval, address, thumb_bit, | |
1976 | is_weakly_undefined_without_plt); | |
1977 | } | |
c121c671 | 1978 | |
51938283 DK |
1979 | // R_ARM_THM_JUMP24: (S + A) | T - P |
1980 | static inline typename This::Status | |
1981 | thm_jump24(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, | |
1982 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
1983 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
1984 | Arm_address address, Arm_address thumb_bit, | |
1985 | bool is_weakly_undefined_without_plt) | |
1986 | { | |
1987 | return thumb_branch_common(elfcpp::R_ARM_THM_JUMP24, relinfo, view, gsym, | |
1988 | object, r_sym, psymval, address, thumb_bit, | |
1989 | is_weakly_undefined_without_plt); | |
1990 | } | |
1991 | ||
1992 | // R_ARM_THM_XPC22: (S + A) | T - P | |
1993 | static inline typename This::Status | |
1994 | thm_xpc22(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, | |
1995 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
1996 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
1997 | Arm_address address, Arm_address thumb_bit, | |
1998 | bool is_weakly_undefined_without_plt) | |
1999 | { | |
2000 | return thumb_branch_common(elfcpp::R_ARM_THM_XPC22, relinfo, view, gsym, | |
2001 | object, r_sym, psymval, address, thumb_bit, | |
2002 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2003 | } |
2004 | ||
2005 | // R_ARM_BASE_PREL: B(S) + A - P | |
2006 | static inline typename This::Status | |
2007 | base_prel(unsigned char* view, | |
ebabffbd DK |
2008 | Arm_address origin, |
2009 | Arm_address address) | |
c121c671 DK |
2010 | { |
2011 | Base::rel32(view, origin - address); | |
2012 | return STATUS_OKAY; | |
2013 | } | |
2014 | ||
be8fcb75 ILT |
2015 | // R_ARM_BASE_ABS: B(S) + A |
2016 | static inline typename This::Status | |
2017 | base_abs(unsigned char* view, | |
f4e5969c | 2018 | Arm_address origin) |
be8fcb75 ILT |
2019 | { |
2020 | Base::rel32(view, origin); | |
2021 | return STATUS_OKAY; | |
2022 | } | |
2023 | ||
c121c671 DK |
2024 | // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG |
2025 | static inline typename This::Status | |
2026 | got_brel(unsigned char* view, | |
2027 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset) | |
2028 | { | |
2029 | Base::rel32(view, got_offset); | |
2030 | return This::STATUS_OKAY; | |
2031 | } | |
2032 | ||
f4e5969c | 2033 | // R_ARM_GOT_PREL: GOT(S) + A - P |
7f5309a5 | 2034 | static inline typename This::Status |
f4e5969c DK |
2035 | got_prel(unsigned char *view, |
2036 | Arm_address got_entry, | |
ebabffbd | 2037 | Arm_address address) |
7f5309a5 | 2038 | { |
f4e5969c | 2039 | Base::rel32(view, got_entry - address); |
7f5309a5 ILT |
2040 | return This::STATUS_OKAY; |
2041 | } | |
2042 | ||
c121c671 DK |
2043 | // R_ARM_PLT32: (S + A) | T - P |
2044 | static inline typename This::Status | |
d204b6e9 DK |
2045 | plt32(const Relocate_info<32, big_endian>* relinfo, |
2046 | unsigned char *view, | |
2047 | const Sized_symbol<32>* gsym, | |
2048 | const Arm_relobj<big_endian>* object, | |
2049 | unsigned int r_sym, | |
c121c671 | 2050 | const Symbol_value<32>* psymval, |
ebabffbd | 2051 | Arm_address address, |
d204b6e9 DK |
2052 | Arm_address thumb_bit, |
2053 | bool is_weakly_undefined_without_plt) | |
2054 | { | |
2055 | return arm_branch_common(elfcpp::R_ARM_PLT32, relinfo, view, gsym, | |
2056 | object, r_sym, psymval, address, thumb_bit, | |
2057 | is_weakly_undefined_without_plt); | |
2058 | } | |
2059 | ||
2060 | // R_ARM_XPC25: (S + A) | T - P | |
2061 | static inline typename This::Status | |
2062 | xpc25(const Relocate_info<32, big_endian>* relinfo, | |
2063 | unsigned char *view, | |
2064 | const Sized_symbol<32>* gsym, | |
2065 | const Arm_relobj<big_endian>* object, | |
2066 | unsigned int r_sym, | |
2067 | const Symbol_value<32>* psymval, | |
2068 | Arm_address address, | |
2069 | Arm_address thumb_bit, | |
2070 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2071 | { |
d204b6e9 DK |
2072 | return arm_branch_common(elfcpp::R_ARM_XPC25, relinfo, view, gsym, |
2073 | object, r_sym, psymval, address, thumb_bit, | |
2074 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2075 | } |
2076 | ||
2077 | // R_ARM_CALL: (S + A) | T - P | |
2078 | static inline typename This::Status | |
d204b6e9 DK |
2079 | call(const Relocate_info<32, big_endian>* relinfo, |
2080 | unsigned char *view, | |
2081 | const Sized_symbol<32>* gsym, | |
2082 | const Arm_relobj<big_endian>* object, | |
2083 | unsigned int r_sym, | |
c121c671 | 2084 | const Symbol_value<32>* psymval, |
ebabffbd | 2085 | Arm_address address, |
d204b6e9 DK |
2086 | Arm_address thumb_bit, |
2087 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2088 | { |
d204b6e9 DK |
2089 | return arm_branch_common(elfcpp::R_ARM_CALL, relinfo, view, gsym, |
2090 | object, r_sym, psymval, address, thumb_bit, | |
2091 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2092 | } |
2093 | ||
2094 | // R_ARM_JUMP24: (S + A) | T - P | |
2095 | static inline typename This::Status | |
d204b6e9 DK |
2096 | jump24(const Relocate_info<32, big_endian>* relinfo, |
2097 | unsigned char *view, | |
2098 | const Sized_symbol<32>* gsym, | |
2099 | const Arm_relobj<big_endian>* object, | |
2100 | unsigned int r_sym, | |
c121c671 | 2101 | const Symbol_value<32>* psymval, |
ebabffbd | 2102 | Arm_address address, |
d204b6e9 DK |
2103 | Arm_address thumb_bit, |
2104 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2105 | { |
d204b6e9 DK |
2106 | return arm_branch_common(elfcpp::R_ARM_JUMP24, relinfo, view, gsym, |
2107 | object, r_sym, psymval, address, thumb_bit, | |
2108 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2109 | } |
2110 | ||
2111 | // R_ARM_PREL: (S + A) | T - P | |
2112 | static inline typename This::Status | |
2113 | prel31(unsigned char *view, | |
2114 | const Sized_relobj<32, big_endian>* object, | |
2115 | const Symbol_value<32>* psymval, | |
ebabffbd | 2116 | Arm_address address, |
2daedcd6 | 2117 | Arm_address thumb_bit) |
c121c671 DK |
2118 | { |
2119 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2120 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2121 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2122 | Valtype addend = utils::sign_extend<31>(val); | |
2daedcd6 | 2123 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c121c671 DK |
2124 | val = utils::bit_select(val, x, 0x7fffffffU); |
2125 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2126 | return (utils::has_overflow<31>(x) ? | |
2127 | This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
2128 | } | |
fd3c5f0b ILT |
2129 | |
2130 | // R_ARM_MOVW_ABS_NC: (S + A) | T | |
2131 | static inline typename This::Status | |
2132 | movw_abs_nc(unsigned char *view, | |
2133 | const Sized_relobj<32, big_endian>* object, | |
2134 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2135 | Arm_address thumb_bit) |
fd3c5f0b ILT |
2136 | { |
2137 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2138 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2139 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2140 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2141 | Valtype x = psymval->value(object, addend) | thumb_bit; |
fd3c5f0b ILT |
2142 | val = This::insert_val_arm_movw_movt(val, x); |
2143 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2144 | return This::STATUS_OKAY; | |
2145 | } | |
2146 | ||
2147 | // R_ARM_MOVT_ABS: S + A | |
2148 | static inline typename This::Status | |
2149 | movt_abs(unsigned char *view, | |
2150 | const Sized_relobj<32, big_endian>* object, | |
2151 | const Symbol_value<32>* psymval) | |
2152 | { | |
2153 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2154 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2155 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2156 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2157 | Valtype x = psymval->value(object, addend) >> 16; |
fd3c5f0b ILT |
2158 | val = This::insert_val_arm_movw_movt(val, x); |
2159 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2160 | return This::STATUS_OKAY; | |
2161 | } | |
2162 | ||
2163 | // R_ARM_THM_MOVW_ABS_NC: S + A | T | |
2164 | static inline typename This::Status | |
2165 | thm_movw_abs_nc(unsigned char *view, | |
2166 | const Sized_relobj<32, big_endian>* object, | |
2167 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2168 | Arm_address thumb_bit) |
fd3c5f0b ILT |
2169 | { |
2170 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2171 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2172 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2173 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2174 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
2175 | Reltype addend = extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2176 | Reltype x = psymval->value(object, addend) | thumb_bit; |
fd3c5f0b ILT |
2177 | val = This::insert_val_thumb_movw_movt(val, x); |
2178 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2179 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2180 | return This::STATUS_OKAY; | |
2181 | } | |
2182 | ||
2183 | // R_ARM_THM_MOVT_ABS: S + A | |
2184 | static inline typename This::Status | |
2185 | thm_movt_abs(unsigned char *view, | |
2186 | const Sized_relobj<32, big_endian>* object, | |
2187 | const Symbol_value<32>* psymval) | |
2188 | { | |
2189 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2190 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2191 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2192 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2193 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
2194 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2195 | Reltype x = psymval->value(object, addend) >> 16; |
fd3c5f0b ILT |
2196 | val = This::insert_val_thumb_movw_movt(val, x); |
2197 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2198 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2199 | return This::STATUS_OKAY; | |
2200 | } | |
2201 | ||
c2a122b6 ILT |
2202 | // R_ARM_MOVW_PREL_NC: (S + A) | T - P |
2203 | static inline typename This::Status | |
2204 | movw_prel_nc(unsigned char *view, | |
2205 | const Sized_relobj<32, big_endian>* object, | |
2206 | const Symbol_value<32>* psymval, | |
ebabffbd | 2207 | Arm_address address, |
2daedcd6 | 2208 | Arm_address thumb_bit) |
c2a122b6 ILT |
2209 | { |
2210 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2211 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2212 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2213 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2214 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c2a122b6 ILT |
2215 | val = This::insert_val_arm_movw_movt(val, x); |
2216 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2217 | return This::STATUS_OKAY; | |
2218 | } | |
2219 | ||
2220 | // R_ARM_MOVT_PREL: S + A - P | |
2221 | static inline typename This::Status | |
2222 | movt_prel(unsigned char *view, | |
2223 | const Sized_relobj<32, big_endian>* object, | |
2224 | const Symbol_value<32>* psymval, | |
ebabffbd | 2225 | Arm_address address) |
c2a122b6 ILT |
2226 | { |
2227 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2228 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2229 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2230 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2231 | Valtype x = (psymval->value(object, addend) - address) >> 16; |
c2a122b6 ILT |
2232 | val = This::insert_val_arm_movw_movt(val, x); |
2233 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2234 | return This::STATUS_OKAY; | |
2235 | } | |
2236 | ||
2237 | // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P | |
2238 | static inline typename This::Status | |
2239 | thm_movw_prel_nc(unsigned char *view, | |
2240 | const Sized_relobj<32, big_endian>* object, | |
2241 | const Symbol_value<32>* psymval, | |
ebabffbd | 2242 | Arm_address address, |
2daedcd6 | 2243 | Arm_address thumb_bit) |
c2a122b6 ILT |
2244 | { |
2245 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2246 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2247 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2248 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2249 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2250 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2251 | Reltype x = (psymval->value(object, addend) | thumb_bit) - address; |
c2a122b6 ILT |
2252 | val = This::insert_val_thumb_movw_movt(val, x); |
2253 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2254 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2255 | return This::STATUS_OKAY; | |
2256 | } | |
2257 | ||
2258 | // R_ARM_THM_MOVT_PREL: S + A - P | |
2259 | static inline typename This::Status | |
2260 | thm_movt_prel(unsigned char *view, | |
2261 | const Sized_relobj<32, big_endian>* object, | |
2262 | const Symbol_value<32>* psymval, | |
ebabffbd | 2263 | Arm_address address) |
c2a122b6 ILT |
2264 | { |
2265 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2266 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2267 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2268 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2269 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2270 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2271 | Reltype x = (psymval->value(object, addend) - address) >> 16; |
c2a122b6 ILT |
2272 | val = This::insert_val_thumb_movw_movt(val, x); |
2273 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2274 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2275 | return This::STATUS_OKAY; | |
2276 | } | |
c121c671 DK |
2277 | }; |
2278 | ||
d204b6e9 DK |
2279 | // Relocate ARM long branches. This handles relocation types |
2280 | // R_ARM_CALL, R_ARM_JUMP24, R_ARM_PLT32 and R_ARM_XPC25. | |
2281 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2282 | // undefined and we do not use PLT in this relocation. In such a case, | |
2283 | // the branch is converted into an NOP. | |
2284 | ||
2285 | template<bool big_endian> | |
2286 | typename Arm_relocate_functions<big_endian>::Status | |
2287 | Arm_relocate_functions<big_endian>::arm_branch_common( | |
2288 | unsigned int r_type, | |
2289 | const Relocate_info<32, big_endian>* relinfo, | |
2290 | unsigned char *view, | |
2291 | const Sized_symbol<32>* gsym, | |
2292 | const Arm_relobj<big_endian>* object, | |
2293 | unsigned int r_sym, | |
2294 | const Symbol_value<32>* psymval, | |
2295 | Arm_address address, | |
2296 | Arm_address thumb_bit, | |
2297 | bool is_weakly_undefined_without_plt) | |
2298 | { | |
2299 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2300 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2301 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2302 | ||
2303 | bool insn_is_b = (((val >> 28) & 0xf) <= 0xe) | |
2304 | && ((val & 0x0f000000UL) == 0x0a000000UL); | |
2305 | bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL; | |
2306 | bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe) | |
2307 | && ((val & 0x0f000000UL) == 0x0b000000UL); | |
2308 | bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL; | |
2309 | bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL; | |
2310 | ||
2311 | // Check that the instruction is valid. | |
2312 | if (r_type == elfcpp::R_ARM_CALL) | |
2313 | { | |
2314 | if (!insn_is_uncond_bl && !insn_is_blx) | |
2315 | return This::STATUS_BAD_RELOC; | |
2316 | } | |
2317 | else if (r_type == elfcpp::R_ARM_JUMP24) | |
2318 | { | |
2319 | if (!insn_is_b && !insn_is_cond_bl) | |
2320 | return This::STATUS_BAD_RELOC; | |
2321 | } | |
2322 | else if (r_type == elfcpp::R_ARM_PLT32) | |
2323 | { | |
2324 | if (!insn_is_any_branch) | |
2325 | return This::STATUS_BAD_RELOC; | |
2326 | } | |
2327 | else if (r_type == elfcpp::R_ARM_XPC25) | |
2328 | { | |
2329 | // FIXME: AAELF document IH0044C does not say much about it other | |
2330 | // than it being obsolete. | |
2331 | if (!insn_is_any_branch) | |
2332 | return This::STATUS_BAD_RELOC; | |
2333 | } | |
2334 | else | |
2335 | gold_unreachable(); | |
2336 | ||
2337 | // A branch to an undefined weak symbol is turned into a jump to | |
2338 | // the next instruction unless a PLT entry will be created. | |
2339 | // Do the same for local undefined symbols. | |
2340 | // The jump to the next instruction is optimized as a NOP depending | |
2341 | // on the architecture. | |
2342 | const Target_arm<big_endian>* arm_target = | |
2343 | Target_arm<big_endian>::default_target(); | |
2344 | if (is_weakly_undefined_without_plt) | |
2345 | { | |
2346 | Valtype cond = val & 0xf0000000U; | |
2347 | if (arm_target->may_use_arm_nop()) | |
2348 | val = cond | 0x0320f000; | |
2349 | else | |
2350 | val = cond | 0x01a00000; // Using pre-UAL nop: mov r0, r0. | |
2351 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2352 | return This::STATUS_OKAY; | |
2353 | } | |
2354 | ||
2355 | Valtype addend = utils::sign_extend<26>(val << 2); | |
2356 | Valtype branch_target = psymval->value(object, addend); | |
2357 | int32_t branch_offset = branch_target - address; | |
2358 | ||
2359 | // We need a stub if the branch offset is too large or if we need | |
2360 | // to switch mode. | |
2361 | bool may_use_blx = arm_target->may_use_blx(); | |
2362 | Reloc_stub* stub = NULL; | |
2363 | if ((branch_offset > ARM_MAX_FWD_BRANCH_OFFSET) | |
2364 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
2365 | || ((thumb_bit != 0) && !(may_use_blx && r_type == elfcpp::R_ARM_CALL))) | |
2366 | { | |
2367 | Stub_type stub_type = | |
2368 | Reloc_stub::stub_type_for_reloc(r_type, address, branch_target, | |
2369 | (thumb_bit != 0)); | |
2370 | if (stub_type != arm_stub_none) | |
2371 | { | |
2ea97941 | 2372 | Stub_table<big_endian>* stub_table = |
d204b6e9 | 2373 | object->stub_table(relinfo->data_shndx); |
2ea97941 | 2374 | gold_assert(stub_table != NULL); |
d204b6e9 DK |
2375 | |
2376 | Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
2ea97941 | 2377 | stub = stub_table->find_reloc_stub(stub_key); |
d204b6e9 DK |
2378 | gold_assert(stub != NULL); |
2379 | thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0; | |
2ea97941 | 2380 | branch_target = stub_table->address() + stub->offset() + addend; |
d204b6e9 DK |
2381 | branch_offset = branch_target - address; |
2382 | gold_assert((branch_offset <= ARM_MAX_FWD_BRANCH_OFFSET) | |
2383 | && (branch_offset >= ARM_MAX_BWD_BRANCH_OFFSET)); | |
2384 | } | |
2385 | } | |
2386 | ||
2387 | // At this point, if we still need to switch mode, the instruction | |
2388 | // must either be a BLX or a BL that can be converted to a BLX. | |
2389 | if (thumb_bit != 0) | |
2390 | { | |
2391 | // Turn BL to BLX. | |
2392 | gold_assert(may_use_blx && r_type == elfcpp::R_ARM_CALL); | |
2393 | val = (val & 0xffffff) | 0xfa000000 | ((branch_offset & 2) << 23); | |
2394 | } | |
2395 | ||
2396 | val = utils::bit_select(val, (branch_offset >> 2), 0xffffffUL); | |
2397 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2398 | return (utils::has_overflow<26>(branch_offset) | |
2399 | ? This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
2400 | } | |
2401 | ||
51938283 DK |
2402 | // Relocate THUMB long branches. This handles relocation types |
2403 | // R_ARM_THM_CALL, R_ARM_THM_JUMP24 and R_ARM_THM_XPC22. | |
2404 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2405 | // undefined and we do not use PLT in this relocation. In such a case, | |
2406 | // the branch is converted into an NOP. | |
2407 | ||
2408 | template<bool big_endian> | |
2409 | typename Arm_relocate_functions<big_endian>::Status | |
2410 | Arm_relocate_functions<big_endian>::thumb_branch_common( | |
2411 | unsigned int r_type, | |
2412 | const Relocate_info<32, big_endian>* relinfo, | |
2413 | unsigned char *view, | |
2414 | const Sized_symbol<32>* gsym, | |
2415 | const Arm_relobj<big_endian>* object, | |
2416 | unsigned int r_sym, | |
2417 | const Symbol_value<32>* psymval, | |
2418 | Arm_address address, | |
2419 | Arm_address thumb_bit, | |
2420 | bool is_weakly_undefined_without_plt) | |
2421 | { | |
2422 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2423 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2424 | uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
2425 | uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2426 | ||
2427 | // FIXME: These tests are too loose and do not take THUMB/THUMB-2 difference | |
2428 | // into account. | |
2429 | bool is_bl_insn = (lower_insn & 0x1000U) == 0x1000U; | |
2430 | bool is_blx_insn = (lower_insn & 0x1000U) == 0x0000U; | |
2431 | ||
2432 | // Check that the instruction is valid. | |
2433 | if (r_type == elfcpp::R_ARM_THM_CALL) | |
2434 | { | |
2435 | if (!is_bl_insn && !is_blx_insn) | |
2436 | return This::STATUS_BAD_RELOC; | |
2437 | } | |
2438 | else if (r_type == elfcpp::R_ARM_THM_JUMP24) | |
2439 | { | |
2440 | // This cannot be a BLX. | |
2441 | if (!is_bl_insn) | |
2442 | return This::STATUS_BAD_RELOC; | |
2443 | } | |
2444 | else if (r_type == elfcpp::R_ARM_THM_XPC22) | |
2445 | { | |
2446 | // Check for Thumb to Thumb call. | |
2447 | if (!is_blx_insn) | |
2448 | return This::STATUS_BAD_RELOC; | |
2449 | if (thumb_bit != 0) | |
2450 | { | |
2451 | gold_warning(_("%s: Thumb BLX instruction targets " | |
2452 | "thumb function '%s'."), | |
2453 | object->name().c_str(), | |
2454 | (gsym ? gsym->name() : "(local)")); | |
2455 | // Convert BLX to BL. | |
2456 | lower_insn |= 0x1000U; | |
2457 | } | |
2458 | } | |
2459 | else | |
2460 | gold_unreachable(); | |
2461 | ||
2462 | // A branch to an undefined weak symbol is turned into a jump to | |
2463 | // the next instruction unless a PLT entry will be created. | |
2464 | // The jump to the next instruction is optimized as a NOP.W for | |
2465 | // Thumb-2 enabled architectures. | |
2466 | const Target_arm<big_endian>* arm_target = | |
2467 | Target_arm<big_endian>::default_target(); | |
2468 | if (is_weakly_undefined_without_plt) | |
2469 | { | |
2470 | if (arm_target->may_use_thumb2_nop()) | |
2471 | { | |
2472 | elfcpp::Swap<16, big_endian>::writeval(wv, 0xf3af); | |
2473 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0x8000); | |
2474 | } | |
2475 | else | |
2476 | { | |
2477 | elfcpp::Swap<16, big_endian>::writeval(wv, 0xe000); | |
2478 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0xbf00); | |
2479 | } | |
2480 | return This::STATUS_OKAY; | |
2481 | } | |
2482 | ||
2483 | // Fetch the addend. We use the Thumb-2 encoding (backwards compatible | |
2484 | // with Thumb-1) involving the J1 and J2 bits. | |
2485 | uint32_t s = (upper_insn & (1 << 10)) >> 10; | |
2486 | uint32_t upper = upper_insn & 0x3ff; | |
2487 | uint32_t lower = lower_insn & 0x7ff; | |
2488 | uint32_t j1 = (lower_insn & (1 << 13)) >> 13; | |
2489 | uint32_t j2 = (lower_insn & (1 << 11)) >> 11; | |
2490 | uint32_t i1 = j1 ^ s ? 0 : 1; | |
2491 | uint32_t i2 = j2 ^ s ? 0 : 1; | |
2492 | ||
2493 | int32_t addend = (i1 << 23) | (i2 << 22) | (upper << 12) | (lower << 1); | |
2494 | // Sign extend. | |
2495 | addend = (addend | ((s ? 0 : 1) << 24)) - (1 << 24); | |
2496 | ||
2497 | Arm_address branch_target = psymval->value(object, addend); | |
2498 | int32_t branch_offset = branch_target - address; | |
2499 | ||
2500 | // We need a stub if the branch offset is too large or if we need | |
2501 | // to switch mode. | |
2502 | bool may_use_blx = arm_target->may_use_blx(); | |
2503 | bool thumb2 = arm_target->using_thumb2(); | |
2504 | if ((!thumb2 | |
2505 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
2506 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
2507 | || (thumb2 | |
2508 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
2509 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
2510 | || ((thumb_bit == 0) | |
2511 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
2512 | || r_type == elfcpp::R_ARM_THM_JUMP24))) | |
2513 | { | |
2514 | Stub_type stub_type = | |
2515 | Reloc_stub::stub_type_for_reloc(r_type, address, branch_target, | |
2516 | (thumb_bit != 0)); | |
2517 | if (stub_type != arm_stub_none) | |
2518 | { | |
2ea97941 | 2519 | Stub_table<big_endian>* stub_table = |
51938283 | 2520 | object->stub_table(relinfo->data_shndx); |
2ea97941 | 2521 | gold_assert(stub_table != NULL); |
51938283 DK |
2522 | |
2523 | Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
2ea97941 | 2524 | Reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
51938283 DK |
2525 | gold_assert(stub != NULL); |
2526 | thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0; | |
2ea97941 | 2527 | branch_target = stub_table->address() + stub->offset() + addend; |
51938283 DK |
2528 | branch_offset = branch_target - address; |
2529 | } | |
2530 | } | |
2531 | ||
2532 | // At this point, if we still need to switch mode, the instruction | |
2533 | // must either be a BLX or a BL that can be converted to a BLX. | |
2534 | if (thumb_bit == 0) | |
2535 | { | |
2536 | gold_assert(may_use_blx | |
2537 | && (r_type == elfcpp::R_ARM_THM_CALL | |
2538 | || r_type == elfcpp::R_ARM_THM_XPC22)); | |
2539 | // Make sure this is a BLX. | |
2540 | lower_insn &= ~0x1000U; | |
2541 | } | |
2542 | else | |
2543 | { | |
2544 | // Make sure this is a BL. | |
2545 | lower_insn |= 0x1000U; | |
2546 | } | |
2547 | ||
2548 | uint32_t reloc_sign = (branch_offset < 0) ? 1 : 0; | |
2549 | uint32_t relocation = static_cast<uint32_t>(branch_offset); | |
2550 | ||
2551 | if ((lower_insn & 0x5000U) == 0x4000U) | |
2552 | // For a BLX instruction, make sure that the relocation is rounded up | |
2553 | // to a word boundary. This follows the semantics of the instruction | |
2554 | // which specifies that bit 1 of the target address will come from bit | |
2555 | // 1 of the base address. | |
2556 | relocation = (relocation + 2U) & ~3U; | |
2557 | ||
2558 | // Put BRANCH_OFFSET back into the insn. Assumes two's complement. | |
2559 | // We use the Thumb-2 encoding, which is safe even if dealing with | |
2560 | // a Thumb-1 instruction by virtue of our overflow check above. */ | |
2561 | upper_insn = (upper_insn & ~0x7ffU) | |
2562 | | ((relocation >> 12) & 0x3ffU) | |
2563 | | (reloc_sign << 10); | |
2564 | lower_insn = (lower_insn & ~0x2fffU) | |
2565 | | (((!((relocation >> 23) & 1U)) ^ reloc_sign) << 13) | |
2566 | | (((!((relocation >> 22) & 1U)) ^ reloc_sign) << 11) | |
2567 | | ((relocation >> 1) & 0x7ffU); | |
2568 | ||
2569 | elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn); | |
2570 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn); | |
2571 | ||
2572 | return ((thumb2 | |
2573 | ? utils::has_overflow<25>(relocation) | |
2574 | : utils::has_overflow<23>(relocation)) | |
2575 | ? This::STATUS_OVERFLOW | |
2576 | : This::STATUS_OKAY); | |
2577 | } | |
2578 | ||
94cdfcff DK |
2579 | // Get the GOT section, creating it if necessary. |
2580 | ||
2581 | template<bool big_endian> | |
2582 | Output_data_got<32, big_endian>* | |
2583 | Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout) | |
2584 | { | |
2585 | if (this->got_ == NULL) | |
2586 | { | |
2587 | gold_assert(symtab != NULL && layout != NULL); | |
2588 | ||
2589 | this->got_ = new Output_data_got<32, big_endian>(); | |
2590 | ||
2591 | Output_section* os; | |
2592 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
2593 | (elfcpp::SHF_ALLOC | |
2594 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 2595 | this->got_, false); |
94cdfcff DK |
2596 | os->set_is_relro(); |
2597 | ||
2598 | // The old GNU linker creates a .got.plt section. We just | |
2599 | // create another set of data in the .got section. Note that we | |
2600 | // always create a PLT if we create a GOT, although the PLT | |
2601 | // might be empty. | |
2602 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); | |
2603 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
2604 | (elfcpp::SHF_ALLOC | |
2605 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 2606 | this->got_plt_, false); |
94cdfcff DK |
2607 | os->set_is_relro(); |
2608 | ||
2609 | // The first three entries are reserved. | |
2610 | this->got_plt_->set_current_data_size(3 * 4); | |
2611 | ||
2612 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
2613 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
2614 | this->got_plt_, | |
2615 | 0, 0, elfcpp::STT_OBJECT, | |
2616 | elfcpp::STB_LOCAL, | |
2617 | elfcpp::STV_HIDDEN, 0, | |
2618 | false, false); | |
2619 | } | |
2620 | return this->got_; | |
2621 | } | |
2622 | ||
2623 | // Get the dynamic reloc section, creating it if necessary. | |
2624 | ||
2625 | template<bool big_endian> | |
2626 | typename Target_arm<big_endian>::Reloc_section* | |
2627 | Target_arm<big_endian>::rel_dyn_section(Layout* layout) | |
2628 | { | |
2629 | if (this->rel_dyn_ == NULL) | |
2630 | { | |
2631 | gold_assert(layout != NULL); | |
2632 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
2633 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
f5c870d2 | 2634 | elfcpp::SHF_ALLOC, this->rel_dyn_, true); |
94cdfcff DK |
2635 | } |
2636 | return this->rel_dyn_; | |
2637 | } | |
2638 | ||
b569affa DK |
2639 | // Insn_template methods. |
2640 | ||
2641 | // Return byte size of an instruction template. | |
2642 | ||
2643 | size_t | |
2644 | Insn_template::size() const | |
2645 | { | |
2646 | switch (this->type()) | |
2647 | { | |
2648 | case THUMB16_TYPE: | |
2649 | return 2; | |
2650 | case ARM_TYPE: | |
2651 | case THUMB32_TYPE: | |
2652 | case DATA_TYPE: | |
2653 | return 4; | |
2654 | default: | |
2655 | gold_unreachable(); | |
2656 | } | |
2657 | } | |
2658 | ||
2659 | // Return alignment of an instruction template. | |
2660 | ||
2661 | unsigned | |
2662 | Insn_template::alignment() const | |
2663 | { | |
2664 | switch (this->type()) | |
2665 | { | |
2666 | case THUMB16_TYPE: | |
2667 | case THUMB32_TYPE: | |
2668 | return 2; | |
2669 | case ARM_TYPE: | |
2670 | case DATA_TYPE: | |
2671 | return 4; | |
2672 | default: | |
2673 | gold_unreachable(); | |
2674 | } | |
2675 | } | |
2676 | ||
2677 | // Stub_template methods. | |
2678 | ||
2679 | Stub_template::Stub_template( | |
2ea97941 ILT |
2680 | Stub_type type, const Insn_template* insns, |
2681 | size_t insn_count) | |
2682 | : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1), | |
b569affa DK |
2683 | entry_in_thumb_mode_(false), relocs_() |
2684 | { | |
2ea97941 | 2685 | off_t offset = 0; |
b569affa DK |
2686 | |
2687 | // Compute byte size and alignment of stub template. | |
2ea97941 | 2688 | for (size_t i = 0; i < insn_count; i++) |
b569affa | 2689 | { |
2ea97941 ILT |
2690 | unsigned insn_alignment = insns[i].alignment(); |
2691 | size_t insn_size = insns[i].size(); | |
2692 | gold_assert((offset & (insn_alignment - 1)) == 0); | |
b569affa | 2693 | this->alignment_ = std::max(this->alignment_, insn_alignment); |
2ea97941 | 2694 | switch (insns[i].type()) |
b569affa DK |
2695 | { |
2696 | case Insn_template::THUMB16_TYPE: | |
2697 | if (i == 0) | |
2698 | this->entry_in_thumb_mode_ = true; | |
2699 | break; | |
2700 | ||
2701 | case Insn_template::THUMB32_TYPE: | |
2ea97941 ILT |
2702 | if (insns[i].r_type() != elfcpp::R_ARM_NONE) |
2703 | this->relocs_.push_back(Reloc(i, offset)); | |
b569affa DK |
2704 | if (i == 0) |
2705 | this->entry_in_thumb_mode_ = true; | |
2706 | break; | |
2707 | ||
2708 | case Insn_template::ARM_TYPE: | |
2709 | // Handle cases where the target is encoded within the | |
2710 | // instruction. | |
2ea97941 ILT |
2711 | if (insns[i].r_type() == elfcpp::R_ARM_JUMP24) |
2712 | this->relocs_.push_back(Reloc(i, offset)); | |
b569affa DK |
2713 | break; |
2714 | ||
2715 | case Insn_template::DATA_TYPE: | |
2716 | // Entry point cannot be data. | |
2717 | gold_assert(i != 0); | |
2ea97941 | 2718 | this->relocs_.push_back(Reloc(i, offset)); |
b569affa DK |
2719 | break; |
2720 | ||
2721 | default: | |
2722 | gold_unreachable(); | |
2723 | } | |
2ea97941 | 2724 | offset += insn_size; |
b569affa | 2725 | } |
2ea97941 | 2726 | this->size_ = offset; |
b569affa DK |
2727 | } |
2728 | ||
2729 | // Reloc_stub::Key methods. | |
2730 | ||
2731 | // Dump a Key as a string for debugging. | |
2732 | ||
2733 | std::string | |
2734 | Reloc_stub::Key::name() const | |
2735 | { | |
2736 | if (this->r_sym_ == invalid_index) | |
2737 | { | |
2738 | // Global symbol key name | |
2739 | // <stub-type>:<symbol name>:<addend>. | |
2740 | const std::string sym_name = this->u_.symbol->name(); | |
2741 | // We need to print two hex number and two colons. So just add 100 bytes | |
2742 | // to the symbol name size. | |
2743 | size_t len = sym_name.size() + 100; | |
2744 | char* buffer = new char[len]; | |
2745 | int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_, | |
2746 | sym_name.c_str(), this->addend_); | |
2747 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
2748 | delete[] buffer; | |
2749 | return std::string(buffer); | |
2750 | } | |
2751 | else | |
2752 | { | |
2753 | // local symbol key name | |
2754 | // <stub-type>:<object>:<r_sym>:<addend>. | |
2755 | const size_t len = 200; | |
2756 | char buffer[len]; | |
2757 | int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_, | |
2758 | this->u_.relobj, this->r_sym_, this->addend_); | |
2759 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
2760 | return std::string(buffer); | |
2761 | } | |
2762 | } | |
2763 | ||
2764 | // Reloc_stub methods. | |
2765 | ||
2766 | // Determine the type of stub needed, if any, for a relocation of R_TYPE at | |
2767 | // LOCATION to DESTINATION. | |
2768 | // This code is based on the arm_type_of_stub function in | |
2769 | // bfd/elf32-arm.c. We have changed the interface a liitle to keep the Stub | |
2770 | // class simple. | |
2771 | ||
2772 | Stub_type | |
2773 | Reloc_stub::stub_type_for_reloc( | |
2774 | unsigned int r_type, | |
2775 | Arm_address location, | |
2776 | Arm_address destination, | |
2777 | bool target_is_thumb) | |
2778 | { | |
2779 | Stub_type stub_type = arm_stub_none; | |
2780 | ||
2781 | // This is a bit ugly but we want to avoid using a templated class for | |
2782 | // big and little endianities. | |
2783 | bool may_use_blx; | |
2784 | bool should_force_pic_veneer; | |
2785 | bool thumb2; | |
2786 | bool thumb_only; | |
2787 | if (parameters->target().is_big_endian()) | |
2788 | { | |
43d12afe | 2789 | const Target_arm<true>* big_endian_target = |
b569affa | 2790 | Target_arm<true>::default_target(); |
43d12afe DK |
2791 | may_use_blx = big_endian_target->may_use_blx(); |
2792 | should_force_pic_veneer = big_endian_target->should_force_pic_veneer(); | |
2793 | thumb2 = big_endian_target->using_thumb2(); | |
2794 | thumb_only = big_endian_target->using_thumb_only(); | |
b569affa DK |
2795 | } |
2796 | else | |
2797 | { | |
43d12afe | 2798 | const Target_arm<false>* little_endian_target = |
b569affa | 2799 | Target_arm<false>::default_target(); |
43d12afe DK |
2800 | may_use_blx = little_endian_target->may_use_blx(); |
2801 | should_force_pic_veneer = little_endian_target->should_force_pic_veneer(); | |
2802 | thumb2 = little_endian_target->using_thumb2(); | |
2803 | thumb_only = little_endian_target->using_thumb_only(); | |
b569affa DK |
2804 | } |
2805 | ||
2806 | int64_t branch_offset = (int64_t)destination - location; | |
2807 | ||
2808 | if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24) | |
2809 | { | |
2810 | // Handle cases where: | |
2811 | // - this call goes too far (different Thumb/Thumb2 max | |
2812 | // distance) | |
2813 | // - it's a Thumb->Arm call and blx is not available, or it's a | |
2814 | // Thumb->Arm branch (not bl). A stub is needed in this case. | |
2815 | if ((!thumb2 | |
2816 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
2817 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
2818 | || (thumb2 | |
2819 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
2820 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
2821 | || ((!target_is_thumb) | |
2822 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
2823 | || (r_type == elfcpp::R_ARM_THM_JUMP24)))) | |
2824 | { | |
2825 | if (target_is_thumb) | |
2826 | { | |
2827 | // Thumb to thumb. | |
2828 | if (!thumb_only) | |
2829 | { | |
51938283 DK |
2830 | stub_type = (parameters->options().shared() |
2831 | || should_force_pic_veneer) | |
b569affa DK |
2832 | // PIC stubs. |
2833 | ? ((may_use_blx | |
2834 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2835 | // V5T and above. Stub starts with ARM code, so | |
2836 | // we must be able to switch mode before | |
2837 | // reaching it, which is only possible for 'bl' | |
2838 | // (ie R_ARM_THM_CALL relocation). | |
2839 | ? arm_stub_long_branch_any_thumb_pic | |
2840 | // On V4T, use Thumb code only. | |
2841 | : arm_stub_long_branch_v4t_thumb_thumb_pic) | |
2842 | ||
2843 | // non-PIC stubs. | |
2844 | : ((may_use_blx | |
2845 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2846 | ? arm_stub_long_branch_any_any // V5T and above. | |
2847 | : arm_stub_long_branch_v4t_thumb_thumb); // V4T. | |
2848 | } | |
2849 | else | |
2850 | { | |
51938283 DK |
2851 | stub_type = (parameters->options().shared() |
2852 | || should_force_pic_veneer) | |
b569affa DK |
2853 | ? arm_stub_long_branch_thumb_only_pic // PIC stub. |
2854 | : arm_stub_long_branch_thumb_only; // non-PIC stub. | |
2855 | } | |
2856 | } | |
2857 | else | |
2858 | { | |
2859 | // Thumb to arm. | |
2860 | ||
2861 | // FIXME: We should check that the input section is from an | |
2862 | // object that has interwork enabled. | |
2863 | ||
2864 | stub_type = (parameters->options().shared() | |
2865 | || should_force_pic_veneer) | |
2866 | // PIC stubs. | |
2867 | ? ((may_use_blx | |
2868 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2869 | ? arm_stub_long_branch_any_arm_pic // V5T and above. | |
2870 | : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T. | |
2871 | ||
2872 | // non-PIC stubs. | |
2873 | : ((may_use_blx | |
2874 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
2875 | ? arm_stub_long_branch_any_any // V5T and above. | |
2876 | : arm_stub_long_branch_v4t_thumb_arm); // V4T. | |
2877 | ||
2878 | // Handle v4t short branches. | |
2879 | if ((stub_type == arm_stub_long_branch_v4t_thumb_arm) | |
2880 | && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET) | |
2881 | && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET)) | |
2882 | stub_type = arm_stub_short_branch_v4t_thumb_arm; | |
2883 | } | |
2884 | } | |
2885 | } | |
2886 | else if (r_type == elfcpp::R_ARM_CALL | |
2887 | || r_type == elfcpp::R_ARM_JUMP24 | |
2888 | || r_type == elfcpp::R_ARM_PLT32) | |
2889 | { | |
2890 | if (target_is_thumb) | |
2891 | { | |
2892 | // Arm to thumb. | |
2893 | ||
2894 | // FIXME: We should check that the input section is from an | |
2895 | // object that has interwork enabled. | |
2896 | ||
2897 | // We have an extra 2-bytes reach because of | |
2898 | // the mode change (bit 24 (H) of BLX encoding). | |
2899 | if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2) | |
2900 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
2901 | || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx) | |
2902 | || (r_type == elfcpp::R_ARM_JUMP24) | |
2903 | || (r_type == elfcpp::R_ARM_PLT32)) | |
2904 | { | |
2905 | stub_type = (parameters->options().shared() | |
2906 | || should_force_pic_veneer) | |
2907 | // PIC stubs. | |
2908 | ? (may_use_blx | |
2909 | ? arm_stub_long_branch_any_thumb_pic// V5T and above. | |
2910 | : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub. | |
2911 | ||
2912 | // non-PIC stubs. | |
2913 | : (may_use_blx | |
2914 | ? arm_stub_long_branch_any_any // V5T and above. | |
2915 | : arm_stub_long_branch_v4t_arm_thumb); // V4T. | |
2916 | } | |
2917 | } | |
2918 | else | |
2919 | { | |
2920 | // Arm to arm. | |
2921 | if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET | |
2922 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)) | |
2923 | { | |
2924 | stub_type = (parameters->options().shared() | |
2925 | || should_force_pic_veneer) | |
2926 | ? arm_stub_long_branch_any_arm_pic // PIC stubs. | |
2927 | : arm_stub_long_branch_any_any; /// non-PIC. | |
2928 | } | |
2929 | } | |
2930 | } | |
2931 | ||
2932 | return stub_type; | |
2933 | } | |
2934 | ||
2935 | // Template to implement do_write for a specific target endianity. | |
2936 | ||
2937 | template<bool big_endian> | |
2938 | void inline | |
2939 | Reloc_stub::do_fixed_endian_write(unsigned char* view, | |
2940 | section_size_type view_size) | |
2941 | { | |
2ea97941 ILT |
2942 | const Stub_template* stub_template = this->stub_template(); |
2943 | const Insn_template* insns = stub_template->insns(); | |
b569affa DK |
2944 | |
2945 | // FIXME: We do not handle BE8 encoding yet. | |
2946 | unsigned char* pov = view; | |
2ea97941 | 2947 | for (size_t i = 0; i < stub_template->insn_count(); i++) |
b569affa DK |
2948 | { |
2949 | switch (insns[i].type()) | |
2950 | { | |
2951 | case Insn_template::THUMB16_TYPE: | |
2952 | // Non-zero reloc addends are only used in Cortex-A8 stubs. | |
2953 | gold_assert(insns[i].reloc_addend() == 0); | |
2954 | elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff); | |
2955 | break; | |
2956 | case Insn_template::THUMB32_TYPE: | |
2957 | { | |
2958 | uint32_t hi = (insns[i].data() >> 16) & 0xffff; | |
2959 | uint32_t lo = insns[i].data() & 0xffff; | |
2960 | elfcpp::Swap<16, big_endian>::writeval(pov, hi); | |
2961 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo); | |
2962 | } | |
2963 | break; | |
2964 | case Insn_template::ARM_TYPE: | |
2965 | case Insn_template::DATA_TYPE: | |
2966 | elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data()); | |
2967 | break; | |
2968 | default: | |
2969 | gold_unreachable(); | |
2970 | } | |
2971 | pov += insns[i].size(); | |
2972 | } | |
2973 | gold_assert(static_cast<section_size_type>(pov - view) == view_size); | |
2974 | } | |
2975 | ||
2976 | // Write a reloc stub to VIEW with endianity specified by BIG_ENDIAN. | |
2977 | ||
2978 | void | |
2979 | Reloc_stub::do_write(unsigned char* view, section_size_type view_size, | |
2980 | bool big_endian) | |
2981 | { | |
2982 | if (big_endian) | |
2983 | this->do_fixed_endian_write<true>(view, view_size); | |
2984 | else | |
2985 | this->do_fixed_endian_write<false>(view, view_size); | |
2986 | } | |
2987 | ||
2988 | // Stub_factory methods. | |
2989 | ||
2990 | Stub_factory::Stub_factory() | |
2991 | { | |
2992 | // The instruction template sequences are declared as static | |
2993 | // objects and initialized first time the constructor runs. | |
2994 | ||
2995 | // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx | |
2996 | // to reach the stub if necessary. | |
2997 | static const Insn_template elf32_arm_stub_long_branch_any_any[] = | |
2998 | { | |
2999 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
3000 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3001 | // dcd R_ARM_ABS32(X) | |
3002 | }; | |
3003 | ||
3004 | // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not | |
3005 | // available. | |
3006 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] = | |
3007 | { | |
3008 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3009 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3010 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3011 | // dcd R_ARM_ABS32(X) | |
3012 | }; | |
3013 | ||
3014 | // Thumb -> Thumb long branch stub. Used on M-profile architectures. | |
3015 | static const Insn_template elf32_arm_stub_long_branch_thumb_only[] = | |
3016 | { | |
3017 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
3018 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
3019 | Insn_template::thumb16_insn(0x4684), // mov ip, r0 | |
3020 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
3021 | Insn_template::thumb16_insn(0x4760), // bx ip | |
3022 | Insn_template::thumb16_insn(0xbf00), // nop | |
3023 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3024 | // dcd R_ARM_ABS32(X) | |
3025 | }; | |
3026 | ||
3027 | // V4T Thumb -> Thumb long branch stub. Using the stack is not | |
3028 | // allowed. | |
3029 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] = | |
3030 | { | |
3031 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3032 | Insn_template::thumb16_insn(0x46c0), // nop | |
3033 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3034 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3035 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3036 | // dcd R_ARM_ABS32(X) | |
3037 | }; | |
3038 | ||
3039 | // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not | |
3040 | // available. | |
3041 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] = | |
3042 | { | |
3043 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3044 | Insn_template::thumb16_insn(0x46c0), // nop | |
3045 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
3046 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3047 | // dcd R_ARM_ABS32(X) | |
3048 | }; | |
3049 | ||
3050 | // V4T Thumb -> ARM short branch stub. Shorter variant of the above | |
3051 | // one, when the destination is close enough. | |
3052 | static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] = | |
3053 | { | |
3054 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3055 | Insn_template::thumb16_insn(0x46c0), // nop | |
3056 | Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8) | |
3057 | }; | |
3058 | ||
3059 | // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use | |
3060 | // blx to reach the stub if necessary. | |
3061 | static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] = | |
3062 | { | |
3063 | Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc] | |
3064 | Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip | |
3065 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
3066 | // dcd R_ARM_REL32(X-4) | |
3067 | }; | |
3068 | ||
3069 | // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use | |
3070 | // blx to reach the stub if necessary. We can not add into pc; | |
3071 | // it is not guaranteed to mode switch (different in ARMv6 and | |
3072 | // ARMv7). | |
3073 | static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] = | |
3074 | { | |
3075 | Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4] | |
3076 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3077 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3078 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3079 | // dcd R_ARM_REL32(X) | |
3080 | }; | |
3081 | ||
3082 | // V4T ARM -> ARM long branch stub, PIC. | |
3083 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] = | |
3084 | { | |
3085 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
3086 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3087 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3088 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3089 | // dcd R_ARM_REL32(X) | |
3090 | }; | |
3091 | ||
3092 | // V4T Thumb -> ARM long branch stub, PIC. | |
3093 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] = | |
3094 | { | |
3095 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3096 | Insn_template::thumb16_insn(0x46c0), // nop | |
3097 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3098 | Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc | |
3099 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
3100 | // dcd R_ARM_REL32(X) | |
3101 | }; | |
3102 | ||
3103 | // Thumb -> Thumb long branch stub, PIC. Used on M-profile | |
3104 | // architectures. | |
3105 | static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] = | |
3106 | { | |
3107 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
3108 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
3109 | Insn_template::thumb16_insn(0x46fc), // mov ip, pc | |
3110 | Insn_template::thumb16_insn(0x4484), // add ip, r0 | |
3111 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
3112 | Insn_template::thumb16_insn(0x4760), // bx ip | |
3113 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4), | |
3114 | // dcd R_ARM_REL32(X) | |
3115 | }; | |
3116 | ||
3117 | // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not | |
3118 | // allowed. | |
3119 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] = | |
3120 | { | |
3121 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3122 | Insn_template::thumb16_insn(0x46c0), // nop | |
3123 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
3124 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3125 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3126 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3127 | // dcd R_ARM_REL32(X) | |
3128 | }; | |
3129 | ||
3130 | // Cortex-A8 erratum-workaround stubs. | |
3131 | ||
3132 | // Stub used for conditional branches (which may be beyond +/-1MB away, | |
3133 | // so we can't use a conditional branch to reach this stub). | |
3134 | ||
3135 | // original code: | |
3136 | // | |
3137 | // b<cond> X | |
3138 | // after: | |
3139 | // | |
3140 | static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] = | |
3141 | { | |
3142 | Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true | |
3143 | Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after | |
3144 | Insn_template::thumb32_b_insn(0xf000b800, -4) // true: | |
3145 | // b.w X | |
3146 | }; | |
3147 | ||
3148 | // Stub used for b.w and bl.w instructions. | |
3149 | ||
3150 | static const Insn_template elf32_arm_stub_a8_veneer_b[] = | |
3151 | { | |
3152 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
3153 | }; | |
3154 | ||
3155 | static const Insn_template elf32_arm_stub_a8_veneer_bl[] = | |
3156 | { | |
3157 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
3158 | }; | |
3159 | ||
3160 | // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w | |
3161 | // instruction (which switches to ARM mode) to point to this stub. Jump to | |
3162 | // the real destination using an ARM-mode branch. | |
3163 | const Insn_template elf32_arm_stub_a8_veneer_blx[] = | |
3164 | { | |
3165 | Insn_template::arm_rel_insn(0xea000000, -8) // b dest | |
3166 | }; | |
3167 | ||
3168 | // Fill in the stub template look-up table. Stub templates are constructed | |
3169 | // per instance of Stub_factory for fast look-up without locking | |
3170 | // in a thread-enabled environment. | |
3171 | ||
3172 | this->stub_templates_[arm_stub_none] = | |
3173 | new Stub_template(arm_stub_none, NULL, 0); | |
3174 | ||
3175 | #define DEF_STUB(x) \ | |
3176 | do \ | |
3177 | { \ | |
3178 | size_t array_size \ | |
3179 | = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \ | |
3180 | Stub_type type = arm_stub_##x; \ | |
3181 | this->stub_templates_[type] = \ | |
3182 | new Stub_template(type, elf32_arm_stub_##x, array_size); \ | |
3183 | } \ | |
3184 | while (0); | |
3185 | ||
3186 | DEF_STUBS | |
3187 | #undef DEF_STUB | |
3188 | } | |
3189 | ||
56ee5e00 DK |
3190 | // Stub_table methods. |
3191 | ||
3192 | // Add a STUB with using KEY. Caller is reponsible for avoid adding | |
3193 | // if already a STUB with the same key has been added. | |
3194 | ||
3195 | template<bool big_endian> | |
3196 | void | |
3197 | Stub_table<big_endian>::add_reloc_stub( | |
3198 | Reloc_stub* stub, | |
3199 | const Reloc_stub::Key& key) | |
3200 | { | |
2ea97941 ILT |
3201 | const Stub_template* stub_template = stub->stub_template(); |
3202 | gold_assert(stub_template->type() == key.stub_type()); | |
56ee5e00 | 3203 | this->reloc_stubs_[key] = stub; |
2ea97941 ILT |
3204 | if (this->addralign_ < stub_template->alignment()) |
3205 | this->addralign_ = stub_template->alignment(); | |
56ee5e00 DK |
3206 | this->has_been_changed_ = true; |
3207 | } | |
3208 | ||
3209 | template<bool big_endian> | |
3210 | void | |
3211 | Stub_table<big_endian>::relocate_stubs( | |
3212 | const Relocate_info<32, big_endian>* relinfo, | |
3213 | Target_arm<big_endian>* arm_target, | |
2ea97941 | 3214 | Output_section* output_section, |
56ee5e00 | 3215 | unsigned char* view, |
2ea97941 | 3216 | Arm_address address, |
56ee5e00 DK |
3217 | section_size_type view_size) |
3218 | { | |
3219 | // If we are passed a view bigger than the stub table's. we need to | |
3220 | // adjust the view. | |
2ea97941 | 3221 | gold_assert(address == this->address() |
56ee5e00 DK |
3222 | && (view_size |
3223 | == static_cast<section_size_type>(this->data_size()))); | |
3224 | ||
3225 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3226 | p != this->reloc_stubs_.end(); | |
3227 | ++p) | |
3228 | { | |
3229 | Reloc_stub* stub = p->second; | |
2ea97941 ILT |
3230 | const Stub_template* stub_template = stub->stub_template(); |
3231 | if (stub_template->reloc_count() != 0) | |
56ee5e00 DK |
3232 | { |
3233 | // Adjust view to cover the stub only. | |
2ea97941 ILT |
3234 | section_size_type offset = stub->offset(); |
3235 | section_size_type stub_size = stub_template->size(); | |
3236 | gold_assert(offset + stub_size <= view_size); | |
56ee5e00 | 3237 | |
2ea97941 ILT |
3238 | arm_target->relocate_stub(stub, relinfo, output_section, |
3239 | view + offset, address + offset, | |
56ee5e00 DK |
3240 | stub_size); |
3241 | } | |
3242 | } | |
3243 | } | |
3244 | ||
3245 | // Reset address and file offset. | |
3246 | ||
3247 | template<bool big_endian> | |
3248 | void | |
3249 | Stub_table<big_endian>::do_reset_address_and_file_offset() | |
3250 | { | |
3251 | off_t off = 0; | |
3252 | uint64_t max_addralign = 1; | |
3253 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3254 | p != this->reloc_stubs_.end(); | |
3255 | ++p) | |
3256 | { | |
3257 | Reloc_stub* stub = p->second; | |
2ea97941 ILT |
3258 | const Stub_template* stub_template = stub->stub_template(); |
3259 | uint64_t stub_addralign = stub_template->alignment(); | |
56ee5e00 DK |
3260 | max_addralign = std::max(max_addralign, stub_addralign); |
3261 | off = align_address(off, stub_addralign); | |
3262 | stub->set_offset(off); | |
3263 | stub->reset_destination_address(); | |
2ea97941 | 3264 | off += stub_template->size(); |
56ee5e00 DK |
3265 | } |
3266 | ||
3267 | this->addralign_ = max_addralign; | |
3268 | this->set_current_data_size_for_child(off); | |
3269 | } | |
3270 | ||
3271 | // Write out the stubs to file. | |
3272 | ||
3273 | template<bool big_endian> | |
3274 | void | |
3275 | Stub_table<big_endian>::do_write(Output_file* of) | |
3276 | { | |
2ea97941 | 3277 | off_t offset = this->offset(); |
56ee5e00 DK |
3278 | const section_size_type oview_size = |
3279 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 3280 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
56ee5e00 DK |
3281 | |
3282 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3283 | p != this->reloc_stubs_.end(); | |
3284 | ++p) | |
3285 | { | |
3286 | Reloc_stub* stub = p->second; | |
2ea97941 ILT |
3287 | Arm_address address = this->address() + stub->offset(); |
3288 | gold_assert(address | |
3289 | == align_address(address, | |
56ee5e00 DK |
3290 | stub->stub_template()->alignment())); |
3291 | stub->write(oview + stub->offset(), stub->stub_template()->size(), | |
3292 | big_endian); | |
3293 | } | |
3294 | of->write_output_view(this->offset(), oview_size, oview); | |
3295 | } | |
3296 | ||
10ad9fe5 DK |
3297 | // Arm_input_section methods. |
3298 | ||
3299 | // Initialize an Arm_input_section. | |
3300 | ||
3301 | template<bool big_endian> | |
3302 | void | |
3303 | Arm_input_section<big_endian>::init() | |
3304 | { | |
2ea97941 ILT |
3305 | Relobj* relobj = this->relobj(); |
3306 | unsigned int shndx = this->shndx(); | |
10ad9fe5 DK |
3307 | |
3308 | // Cache these to speed up size and alignment queries. It is too slow | |
3309 | // to call section_addraglin and section_size every time. | |
2ea97941 ILT |
3310 | this->original_addralign_ = relobj->section_addralign(shndx); |
3311 | this->original_size_ = relobj->section_size(shndx); | |
10ad9fe5 DK |
3312 | |
3313 | // We want to make this look like the original input section after | |
3314 | // output sections are finalized. | |
2ea97941 ILT |
3315 | Output_section* os = relobj->output_section(shndx); |
3316 | off_t offset = relobj->output_section_offset(shndx); | |
3317 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); | |
3318 | this->set_address(os->address() + offset); | |
3319 | this->set_file_offset(os->offset() + offset); | |
10ad9fe5 DK |
3320 | |
3321 | this->set_current_data_size(this->original_size_); | |
3322 | this->finalize_data_size(); | |
3323 | } | |
3324 | ||
3325 | template<bool big_endian> | |
3326 | void | |
3327 | Arm_input_section<big_endian>::do_write(Output_file* of) | |
3328 | { | |
3329 | // We have to write out the original section content. | |
3330 | section_size_type section_size; | |
3331 | const unsigned char* section_contents = | |
3332 | this->relobj()->section_contents(this->shndx(), §ion_size, false); | |
3333 | of->write(this->offset(), section_contents, section_size); | |
3334 | ||
3335 | // If this owns a stub table and it is not empty, write it. | |
3336 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) | |
3337 | this->stub_table_->write(of); | |
3338 | } | |
3339 | ||
3340 | // Finalize data size. | |
3341 | ||
3342 | template<bool big_endian> | |
3343 | void | |
3344 | Arm_input_section<big_endian>::set_final_data_size() | |
3345 | { | |
3346 | // If this owns a stub table, finalize its data size as well. | |
3347 | if (this->is_stub_table_owner()) | |
3348 | { | |
2ea97941 | 3349 | uint64_t address = this->address(); |
10ad9fe5 DK |
3350 | |
3351 | // The stub table comes after the original section contents. | |
2ea97941 ILT |
3352 | address += this->original_size_; |
3353 | address = align_address(address, this->stub_table_->addralign()); | |
3354 | off_t offset = this->offset() + (address - this->address()); | |
3355 | this->stub_table_->set_address_and_file_offset(address, offset); | |
3356 | address += this->stub_table_->data_size(); | |
3357 | gold_assert(address == this->address() + this->current_data_size()); | |
10ad9fe5 DK |
3358 | } |
3359 | ||
3360 | this->set_data_size(this->current_data_size()); | |
3361 | } | |
3362 | ||
3363 | // Reset address and file offset. | |
3364 | ||
3365 | template<bool big_endian> | |
3366 | void | |
3367 | Arm_input_section<big_endian>::do_reset_address_and_file_offset() | |
3368 | { | |
3369 | // Size of the original input section contents. | |
3370 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
3371 | ||
3372 | // If this is a stub table owner, account for the stub table size. | |
3373 | if (this->is_stub_table_owner()) | |
3374 | { | |
2ea97941 | 3375 | Stub_table<big_endian>* stub_table = this->stub_table_; |
10ad9fe5 DK |
3376 | |
3377 | // Reset the stub table's address and file offset. The | |
3378 | // current data size for child will be updated after that. | |
3379 | stub_table_->reset_address_and_file_offset(); | |
3380 | off = align_address(off, stub_table_->addralign()); | |
2ea97941 | 3381 | off += stub_table->current_data_size(); |
10ad9fe5 DK |
3382 | } |
3383 | ||
3384 | this->set_current_data_size(off); | |
3385 | } | |
3386 | ||
07f508a2 DK |
3387 | // Arm_output_section methods. |
3388 | ||
3389 | // Create a stub group for input sections from BEGIN to END. OWNER | |
3390 | // points to the input section to be the owner a new stub table. | |
3391 | ||
3392 | template<bool big_endian> | |
3393 | void | |
3394 | Arm_output_section<big_endian>::create_stub_group( | |
3395 | Input_section_list::const_iterator begin, | |
3396 | Input_section_list::const_iterator end, | |
3397 | Input_section_list::const_iterator owner, | |
3398 | Target_arm<big_endian>* target, | |
3399 | std::vector<Output_relaxed_input_section*>* new_relaxed_sections) | |
3400 | { | |
3401 | // Currently we convert ordinary input sections into relaxed sections only | |
3402 | // at this point but we may want to support creating relaxed input section | |
3403 | // very early. So we check here to see if owner is already a relaxed | |
3404 | // section. | |
3405 | ||
3406 | Arm_input_section<big_endian>* arm_input_section; | |
3407 | if (owner->is_relaxed_input_section()) | |
3408 | { | |
3409 | arm_input_section = | |
3410 | Arm_input_section<big_endian>::as_arm_input_section( | |
3411 | owner->relaxed_input_section()); | |
3412 | } | |
3413 | else | |
3414 | { | |
3415 | gold_assert(owner->is_input_section()); | |
3416 | // Create a new relaxed input section. | |
3417 | arm_input_section = | |
3418 | target->new_arm_input_section(owner->relobj(), owner->shndx()); | |
3419 | new_relaxed_sections->push_back(arm_input_section); | |
3420 | } | |
3421 | ||
3422 | // Create a stub table. | |
2ea97941 | 3423 | Stub_table<big_endian>* stub_table = |
07f508a2 DK |
3424 | target->new_stub_table(arm_input_section); |
3425 | ||
2ea97941 | 3426 | arm_input_section->set_stub_table(stub_table); |
07f508a2 DK |
3427 | |
3428 | Input_section_list::const_iterator p = begin; | |
3429 | Input_section_list::const_iterator prev_p; | |
3430 | ||
3431 | // Look for input sections or relaxed input sections in [begin ... end]. | |
3432 | do | |
3433 | { | |
3434 | if (p->is_input_section() || p->is_relaxed_input_section()) | |
3435 | { | |
3436 | // The stub table information for input sections live | |
3437 | // in their objects. | |
3438 | Arm_relobj<big_endian>* arm_relobj = | |
3439 | Arm_relobj<big_endian>::as_arm_relobj(p->relobj()); | |
2ea97941 | 3440 | arm_relobj->set_stub_table(p->shndx(), stub_table); |
07f508a2 DK |
3441 | } |
3442 | prev_p = p++; | |
3443 | } | |
3444 | while (prev_p != end); | |
3445 | } | |
3446 | ||
3447 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit | |
3448 | // of stub groups. We grow a stub group by adding input section until the | |
3449 | // size is just below GROUP_SIZE. The last input section will be converted | |
3450 | // into a stub table. If STUB_ALWAYS_AFTER_BRANCH is false, we also add | |
3451 | // input section after the stub table, effectively double the group size. | |
3452 | // | |
3453 | // This is similar to the group_sections() function in elf32-arm.c but is | |
3454 | // implemented differently. | |
3455 | ||
3456 | template<bool big_endian> | |
3457 | void | |
3458 | Arm_output_section<big_endian>::group_sections( | |
3459 | section_size_type group_size, | |
3460 | bool stubs_always_after_branch, | |
3461 | Target_arm<big_endian>* target) | |
3462 | { | |
3463 | // We only care about sections containing code. | |
3464 | if ((this->flags() & elfcpp::SHF_EXECINSTR) == 0) | |
3465 | return; | |
3466 | ||
3467 | // States for grouping. | |
3468 | typedef enum | |
3469 | { | |
3470 | // No group is being built. | |
3471 | NO_GROUP, | |
3472 | // A group is being built but the stub table is not found yet. | |
3473 | // We keep group a stub group until the size is just under GROUP_SIZE. | |
3474 | // The last input section in the group will be used as the stub table. | |
3475 | FINDING_STUB_SECTION, | |
3476 | // A group is being built and we have already found a stub table. | |
3477 | // We enter this state to grow a stub group by adding input section | |
3478 | // after the stub table. This effectively doubles the group size. | |
3479 | HAS_STUB_SECTION | |
3480 | } State; | |
3481 | ||
3482 | // Any newly created relaxed sections are stored here. | |
3483 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; | |
3484 | ||
3485 | State state = NO_GROUP; | |
3486 | section_size_type off = 0; | |
3487 | section_size_type group_begin_offset = 0; | |
3488 | section_size_type group_end_offset = 0; | |
3489 | section_size_type stub_table_end_offset = 0; | |
3490 | Input_section_list::const_iterator group_begin = | |
3491 | this->input_sections().end(); | |
2ea97941 | 3492 | Input_section_list::const_iterator stub_table = |
07f508a2 DK |
3493 | this->input_sections().end(); |
3494 | Input_section_list::const_iterator group_end = this->input_sections().end(); | |
3495 | for (Input_section_list::const_iterator p = this->input_sections().begin(); | |
3496 | p != this->input_sections().end(); | |
3497 | ++p) | |
3498 | { | |
3499 | section_size_type section_begin_offset = | |
3500 | align_address(off, p->addralign()); | |
3501 | section_size_type section_end_offset = | |
3502 | section_begin_offset + p->data_size(); | |
3503 | ||
3504 | // Check to see if we should group the previously seens sections. | |
e9bbb538 | 3505 | switch (state) |
07f508a2 DK |
3506 | { |
3507 | case NO_GROUP: | |
3508 | break; | |
3509 | ||
3510 | case FINDING_STUB_SECTION: | |
3511 | // Adding this section makes the group larger than GROUP_SIZE. | |
3512 | if (section_end_offset - group_begin_offset >= group_size) | |
3513 | { | |
3514 | if (stubs_always_after_branch) | |
3515 | { | |
3516 | gold_assert(group_end != this->input_sections().end()); | |
3517 | this->create_stub_group(group_begin, group_end, group_end, | |
3518 | target, &new_relaxed_sections); | |
3519 | state = NO_GROUP; | |
3520 | } | |
3521 | else | |
3522 | { | |
3523 | // But wait, there's more! Input sections up to | |
3524 | // stub_group_size bytes after the stub table can be | |
3525 | // handled by it too. | |
3526 | state = HAS_STUB_SECTION; | |
2ea97941 | 3527 | stub_table = group_end; |
07f508a2 DK |
3528 | stub_table_end_offset = group_end_offset; |
3529 | } | |
3530 | } | |
3531 | break; | |
3532 | ||
3533 | case HAS_STUB_SECTION: | |
3534 | // Adding this section makes the post stub-section group larger | |
3535 | // than GROUP_SIZE. | |
3536 | if (section_end_offset - stub_table_end_offset >= group_size) | |
3537 | { | |
3538 | gold_assert(group_end != this->input_sections().end()); | |
2ea97941 | 3539 | this->create_stub_group(group_begin, group_end, stub_table, |
07f508a2 DK |
3540 | target, &new_relaxed_sections); |
3541 | state = NO_GROUP; | |
3542 | } | |
3543 | break; | |
3544 | ||
3545 | default: | |
3546 | gold_unreachable(); | |
3547 | } | |
3548 | ||
3549 | // If we see an input section and currently there is no group, start | |
3550 | // a new one. Skip any empty sections. | |
3551 | if ((p->is_input_section() || p->is_relaxed_input_section()) | |
3552 | && (p->relobj()->section_size(p->shndx()) != 0)) | |
3553 | { | |
3554 | if (state == NO_GROUP) | |
3555 | { | |
3556 | state = FINDING_STUB_SECTION; | |
3557 | group_begin = p; | |
3558 | group_begin_offset = section_begin_offset; | |
3559 | } | |
3560 | ||
3561 | // Keep track of the last input section seen. | |
3562 | group_end = p; | |
3563 | group_end_offset = section_end_offset; | |
3564 | } | |
3565 | ||
3566 | off = section_end_offset; | |
3567 | } | |
3568 | ||
3569 | // Create a stub group for any ungrouped sections. | |
3570 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) | |
3571 | { | |
3572 | gold_assert(group_end != this->input_sections().end()); | |
3573 | this->create_stub_group(group_begin, group_end, | |
3574 | (state == FINDING_STUB_SECTION | |
3575 | ? group_end | |
2ea97941 | 3576 | : stub_table), |
07f508a2 DK |
3577 | target, &new_relaxed_sections); |
3578 | } | |
3579 | ||
3580 | // Convert input section into relaxed input section in a batch. | |
3581 | if (!new_relaxed_sections.empty()) | |
3582 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); | |
3583 | ||
3584 | // Update the section offsets | |
3585 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) | |
3586 | { | |
3587 | Arm_relobj<big_endian>* arm_relobj = | |
3588 | Arm_relobj<big_endian>::as_arm_relobj( | |
3589 | new_relaxed_sections[i]->relobj()); | |
2ea97941 | 3590 | unsigned int shndx = new_relaxed_sections[i]->shndx(); |
07f508a2 | 3591 | // Tell Arm_relobj that this input section is converted. |
2ea97941 | 3592 | arm_relobj->convert_input_section_to_relaxed_section(shndx); |
07f508a2 DK |
3593 | } |
3594 | } | |
3595 | ||
8ffa3667 DK |
3596 | // Arm_relobj methods. |
3597 | ||
3598 | // Scan relocations for stub generation. | |
3599 | ||
3600 | template<bool big_endian> | |
3601 | void | |
3602 | Arm_relobj<big_endian>::scan_sections_for_stubs( | |
3603 | Target_arm<big_endian>* arm_target, | |
3604 | const Symbol_table* symtab, | |
2ea97941 | 3605 | const Layout* layout) |
8ffa3667 | 3606 | { |
2ea97941 ILT |
3607 | unsigned int shnum = this->shnum(); |
3608 | const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
8ffa3667 DK |
3609 | |
3610 | // Read the section headers. | |
3611 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
2ea97941 | 3612 | shnum * shdr_size, |
8ffa3667 DK |
3613 | true, true); |
3614 | ||
3615 | // To speed up processing, we set up hash tables for fast lookup of | |
3616 | // input offsets to output addresses. | |
3617 | this->initialize_input_to_output_maps(); | |
3618 | ||
3619 | const Relobj::Output_sections& out_sections(this->output_sections()); | |
3620 | ||
3621 | Relocate_info<32, big_endian> relinfo; | |
8ffa3667 | 3622 | relinfo.symtab = symtab; |
2ea97941 | 3623 | relinfo.layout = layout; |
8ffa3667 DK |
3624 | relinfo.object = this; |
3625 | ||
2ea97941 ILT |
3626 | const unsigned char* p = pshdrs + shdr_size; |
3627 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
8ffa3667 DK |
3628 | { |
3629 | typename elfcpp::Shdr<32, big_endian> shdr(p); | |
3630 | ||
3631 | unsigned int sh_type = shdr.get_sh_type(); | |
3632 | if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA) | |
3633 | continue; | |
3634 | ||
3635 | off_t sh_size = shdr.get_sh_size(); | |
3636 | if (sh_size == 0) | |
3637 | continue; | |
3638 | ||
3639 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); | |
3640 | if (index >= this->shnum()) | |
3641 | { | |
3642 | // Ignore reloc section with bad info. This error will be | |
3643 | // reported in the final link. | |
3644 | continue; | |
3645 | } | |
3646 | ||
3647 | Output_section* os = out_sections[index]; | |
d6344fb5 DK |
3648 | if (os == NULL |
3649 | || symtab->is_section_folded(this, index)) | |
8ffa3667 DK |
3650 | { |
3651 | // This relocation section is against a section which we | |
d6344fb5 DK |
3652 | // discarded or if the section is folded into another |
3653 | // section due to ICF. | |
8ffa3667 DK |
3654 | continue; |
3655 | } | |
3656 | Arm_address output_offset = this->get_output_section_offset(index); | |
3657 | ||
3658 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) | |
3659 | { | |
3660 | // Ignore reloc section with unexpected symbol table. The | |
3661 | // error will be reported in the final link. | |
3662 | continue; | |
3663 | } | |
3664 | ||
3665 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), | |
3666 | sh_size, true, false); | |
3667 | ||
3668 | unsigned int reloc_size; | |
3669 | if (sh_type == elfcpp::SHT_REL) | |
3670 | reloc_size = elfcpp::Elf_sizes<32>::rel_size; | |
3671 | else | |
3672 | reloc_size = elfcpp::Elf_sizes<32>::rela_size; | |
3673 | ||
3674 | if (reloc_size != shdr.get_sh_entsize()) | |
3675 | { | |
3676 | // Ignore reloc section with unexpected entsize. The error | |
3677 | // will be reported in the final link. | |
3678 | continue; | |
3679 | } | |
3680 | ||
3681 | size_t reloc_count = sh_size / reloc_size; | |
3682 | if (static_cast<off_t>(reloc_count * reloc_size) != sh_size) | |
3683 | { | |
3684 | // Ignore reloc section with uneven size. The error will be | |
3685 | // reported in the final link. | |
3686 | continue; | |
3687 | } | |
3688 | ||
3689 | gold_assert(output_offset != invalid_address | |
3690 | || this->relocs_must_follow_section_writes()); | |
3691 | ||
3692 | // Get the section contents. This does work for the case in which | |
3693 | // we modify the contents of an input section. We need to pass the | |
3694 | // output view under such circumstances. | |
3695 | section_size_type input_view_size = 0; | |
3696 | const unsigned char* input_view = | |
3697 | this->section_contents(index, &input_view_size, false); | |
3698 | ||
3699 | relinfo.reloc_shndx = i; | |
3700 | relinfo.data_shndx = index; | |
3701 | arm_target->scan_section_for_stubs(&relinfo, sh_type, prelocs, | |
3702 | reloc_count, os, | |
3703 | output_offset == invalid_address, | |
3704 | input_view, | |
3705 | os->address(), | |
3706 | input_view_size); | |
3707 | } | |
3708 | ||
3709 | // After we've done the relocations, we release the hash tables, | |
3710 | // since we no longer need them. | |
3711 | this->free_input_to_output_maps(); | |
3712 | } | |
3713 | ||
3714 | // Count the local symbols. The ARM backend needs to know if a symbol | |
3715 | // is a THUMB function or not. For global symbols, it is easy because | |
3716 | // the Symbol object keeps the ELF symbol type. For local symbol it is | |
3717 | // harder because we cannot access this information. So we override the | |
3718 | // do_count_local_symbol in parent and scan local symbols to mark | |
3719 | // THUMB functions. This is not the most efficient way but I do not want to | |
3720 | // slow down other ports by calling a per symbol targer hook inside | |
3721 | // Sized_relobj<size, big_endian>::do_count_local_symbols. | |
3722 | ||
3723 | template<bool big_endian> | |
3724 | void | |
3725 | Arm_relobj<big_endian>::do_count_local_symbols( | |
3726 | Stringpool_template<char>* pool, | |
3727 | Stringpool_template<char>* dynpool) | |
3728 | { | |
3729 | // We need to fix-up the values of any local symbols whose type are | |
3730 | // STT_ARM_TFUNC. | |
3731 | ||
3732 | // Ask parent to count the local symbols. | |
3733 | Sized_relobj<32, big_endian>::do_count_local_symbols(pool, dynpool); | |
3734 | const unsigned int loccount = this->local_symbol_count(); | |
3735 | if (loccount == 0) | |
3736 | return; | |
3737 | ||
3738 | // Intialize the thumb function bit-vector. | |
3739 | std::vector<bool> empty_vector(loccount, false); | |
3740 | this->local_symbol_is_thumb_function_.swap(empty_vector); | |
3741 | ||
3742 | // Read the symbol table section header. | |
2ea97941 | 3743 | const unsigned int symtab_shndx = this->symtab_shndx(); |
8ffa3667 | 3744 | elfcpp::Shdr<32, big_endian> |
2ea97941 | 3745 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); |
8ffa3667 DK |
3746 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
3747 | ||
3748 | // Read the local symbols. | |
2ea97941 | 3749 | const int sym_size =elfcpp::Elf_sizes<32>::sym_size; |
8ffa3667 | 3750 | gold_assert(loccount == symtabshdr.get_sh_info()); |
2ea97941 | 3751 | off_t locsize = loccount * sym_size; |
8ffa3667 DK |
3752 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
3753 | locsize, true, true); | |
3754 | ||
3755 | // Loop over the local symbols and mark any local symbols pointing | |
3756 | // to THUMB functions. | |
3757 | ||
3758 | // Skip the first dummy symbol. | |
2ea97941 | 3759 | psyms += sym_size; |
8ffa3667 DK |
3760 | typename Sized_relobj<32, big_endian>::Local_values* plocal_values = |
3761 | this->local_values(); | |
2ea97941 | 3762 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
8ffa3667 DK |
3763 | { |
3764 | elfcpp::Sym<32, big_endian> sym(psyms); | |
3765 | elfcpp::STT st_type = sym.get_st_type(); | |
3766 | Symbol_value<32>& lv((*plocal_values)[i]); | |
3767 | Arm_address input_value = lv.input_value(); | |
3768 | ||
3769 | if (st_type == elfcpp::STT_ARM_TFUNC | |
3770 | || (st_type == elfcpp::STT_FUNC && ((input_value & 1) != 0))) | |
3771 | { | |
3772 | // This is a THUMB function. Mark this and canonicalize the | |
3773 | // symbol value by setting LSB. | |
3774 | this->local_symbol_is_thumb_function_[i] = true; | |
3775 | if ((input_value & 1) == 0) | |
3776 | lv.set_input_value(input_value | 1); | |
3777 | } | |
3778 | } | |
3779 | } | |
3780 | ||
3781 | // Relocate sections. | |
3782 | template<bool big_endian> | |
3783 | void | |
3784 | Arm_relobj<big_endian>::do_relocate_sections( | |
8ffa3667 | 3785 | const Symbol_table* symtab, |
2ea97941 | 3786 | const Layout* layout, |
8ffa3667 DK |
3787 | const unsigned char* pshdrs, |
3788 | typename Sized_relobj<32, big_endian>::Views* pviews) | |
3789 | { | |
3790 | // Call parent to relocate sections. | |
2ea97941 | 3791 | Sized_relobj<32, big_endian>::do_relocate_sections(symtab, layout, pshdrs, |
43d12afe | 3792 | pviews); |
8ffa3667 DK |
3793 | |
3794 | // We do not generate stubs if doing a relocatable link. | |
3795 | if (parameters->options().relocatable()) | |
3796 | return; | |
3797 | ||
3798 | // Relocate stub tables. | |
2ea97941 | 3799 | unsigned int shnum = this->shnum(); |
8ffa3667 DK |
3800 | |
3801 | Target_arm<big_endian>* arm_target = | |
3802 | Target_arm<big_endian>::default_target(); | |
3803 | ||
3804 | Relocate_info<32, big_endian> relinfo; | |
8ffa3667 | 3805 | relinfo.symtab = symtab; |
2ea97941 | 3806 | relinfo.layout = layout; |
8ffa3667 DK |
3807 | relinfo.object = this; |
3808 | ||
2ea97941 | 3809 | for (unsigned int i = 1; i < shnum; ++i) |
8ffa3667 DK |
3810 | { |
3811 | Arm_input_section<big_endian>* arm_input_section = | |
3812 | arm_target->find_arm_input_section(this, i); | |
3813 | ||
3814 | if (arm_input_section == NULL | |
3815 | || !arm_input_section->is_stub_table_owner() | |
3816 | || arm_input_section->stub_table()->empty()) | |
3817 | continue; | |
3818 | ||
3819 | // We cannot discard a section if it owns a stub table. | |
3820 | Output_section* os = this->output_section(i); | |
3821 | gold_assert(os != NULL); | |
3822 | ||
3823 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; | |
3824 | relinfo.reloc_shdr = NULL; | |
3825 | relinfo.data_shndx = i; | |
3826 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<32>::shdr_size; | |
3827 | ||
3828 | gold_assert((*pviews)[i].view != NULL); | |
3829 | ||
3830 | // We are passed the output section view. Adjust it to cover the | |
3831 | // stub table only. | |
2ea97941 ILT |
3832 | Stub_table<big_endian>* stub_table = arm_input_section->stub_table(); |
3833 | gold_assert((stub_table->address() >= (*pviews)[i].address) | |
3834 | && ((stub_table->address() + stub_table->data_size()) | |
8ffa3667 DK |
3835 | <= (*pviews)[i].address + (*pviews)[i].view_size)); |
3836 | ||
2ea97941 ILT |
3837 | off_t offset = stub_table->address() - (*pviews)[i].address; |
3838 | unsigned char* view = (*pviews)[i].view + offset; | |
3839 | Arm_address address = stub_table->address(); | |
3840 | section_size_type view_size = stub_table->data_size(); | |
8ffa3667 | 3841 | |
2ea97941 ILT |
3842 | stub_table->relocate_stubs(&relinfo, arm_target, os, view, address, |
3843 | view_size); | |
8ffa3667 DK |
3844 | } |
3845 | } | |
3846 | ||
a0351a69 DK |
3847 | // Helper functions for both Arm_relobj and Arm_dynobj to read ARM |
3848 | // ABI information. | |
3849 | ||
3850 | template<bool big_endian> | |
3851 | Attributes_section_data* | |
3852 | read_arm_attributes_section( | |
3853 | Object* object, | |
3854 | Read_symbols_data *sd) | |
3855 | { | |
3856 | // Read the attributes section if there is one. | |
3857 | // We read from the end because gas seems to put it near the end of | |
3858 | // the section headers. | |
3859 | const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
3860 | const unsigned char *ps = | |
3861 | sd->section_headers->data() + shdr_size * (object->shnum() - 1); | |
3862 | for (unsigned int i = object->shnum(); i > 0; --i, ps -= shdr_size) | |
3863 | { | |
3864 | elfcpp::Shdr<32, big_endian> shdr(ps); | |
3865 | if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES) | |
3866 | { | |
3867 | section_offset_type section_offset = shdr.get_sh_offset(); | |
3868 | section_size_type section_size = | |
3869 | convert_to_section_size_type(shdr.get_sh_size()); | |
3870 | File_view* view = object->get_lasting_view(section_offset, | |
3871 | section_size, true, false); | |
3872 | return new Attributes_section_data(view->data(), section_size); | |
3873 | } | |
3874 | } | |
3875 | return NULL; | |
3876 | } | |
3877 | ||
d5b40221 DK |
3878 | // Read the symbol information. |
3879 | ||
3880 | template<bool big_endian> | |
3881 | void | |
3882 | Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) | |
3883 | { | |
3884 | // Call parent class to read symbol information. | |
3885 | Sized_relobj<32, big_endian>::do_read_symbols(sd); | |
3886 | ||
3887 | // Read processor-specific flags in ELF file header. | |
3888 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
3889 | elfcpp::Elf_sizes<32>::ehdr_size, | |
3890 | true, false); | |
3891 | elfcpp::Ehdr<32, big_endian> ehdr(pehdr); | |
3892 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
a0351a69 DK |
3893 | this->attributes_section_data_ = |
3894 | read_arm_attributes_section<big_endian>(this, sd); | |
d5b40221 DK |
3895 | } |
3896 | ||
3897 | // Arm_dynobj methods. | |
3898 | ||
3899 | // Read the symbol information. | |
3900 | ||
3901 | template<bool big_endian> | |
3902 | void | |
3903 | Arm_dynobj<big_endian>::do_read_symbols(Read_symbols_data* sd) | |
3904 | { | |
3905 | // Call parent class to read symbol information. | |
3906 | Sized_dynobj<32, big_endian>::do_read_symbols(sd); | |
3907 | ||
3908 | // Read processor-specific flags in ELF file header. | |
3909 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
3910 | elfcpp::Elf_sizes<32>::ehdr_size, | |
3911 | true, false); | |
3912 | elfcpp::Ehdr<32, big_endian> ehdr(pehdr); | |
3913 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
a0351a69 DK |
3914 | this->attributes_section_data_ = |
3915 | read_arm_attributes_section<big_endian>(this, sd); | |
d5b40221 DK |
3916 | } |
3917 | ||
e9bbb538 DK |
3918 | // Stub_addend_reader methods. |
3919 | ||
3920 | // Read the addend of a REL relocation of type R_TYPE at VIEW. | |
3921 | ||
3922 | template<bool big_endian> | |
3923 | elfcpp::Elf_types<32>::Elf_Swxword | |
3924 | Stub_addend_reader<elfcpp::SHT_REL, big_endian>::operator()( | |
3925 | unsigned int r_type, | |
3926 | const unsigned char* view, | |
3927 | const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const | |
3928 | { | |
3929 | switch (r_type) | |
3930 | { | |
3931 | case elfcpp::R_ARM_CALL: | |
3932 | case elfcpp::R_ARM_JUMP24: | |
3933 | case elfcpp::R_ARM_PLT32: | |
3934 | { | |
3935 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
3936 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
3937 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
3938 | return utils::sign_extend<26>(val << 2); | |
3939 | } | |
3940 | ||
3941 | case elfcpp::R_ARM_THM_CALL: | |
3942 | case elfcpp::R_ARM_THM_JUMP24: | |
3943 | case elfcpp::R_ARM_THM_XPC22: | |
3944 | { | |
3945 | // Fetch the addend. We use the Thumb-2 encoding (backwards | |
3946 | // compatible with Thumb-1) involving the J1 and J2 bits. | |
3947 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
3948 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
3949 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
3950 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
3951 | ||
3952 | uint32_t s = (upper_insn & (1 << 10)) >> 10; | |
3953 | uint32_t upper = upper_insn & 0x3ff; | |
3954 | uint32_t lower = lower_insn & 0x7ff; | |
3955 | uint32_t j1 = (lower_insn & (1 << 13)) >> 13; | |
3956 | uint32_t j2 = (lower_insn & (1 << 11)) >> 11; | |
3957 | uint32_t i1 = j1 ^ s ? 0 : 1; | |
3958 | uint32_t i2 = j2 ^ s ? 0 : 1; | |
3959 | ||
3960 | return utils::sign_extend<25>((s << 24) | (i1 << 23) | (i2 << 22) | |
3961 | | (upper << 12) | (lower << 1)); | |
3962 | } | |
3963 | ||
3964 | case elfcpp::R_ARM_THM_JUMP19: | |
3965 | { | |
3966 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
3967 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
3968 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
3969 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
3970 | ||
3971 | // Reconstruct the top three bits and squish the two 11 bit pieces | |
3972 | // together. | |
3973 | uint32_t S = (upper_insn & 0x0400) >> 10; | |
3974 | uint32_t J1 = (lower_insn & 0x2000) >> 13; | |
3975 | uint32_t J2 = (lower_insn & 0x0800) >> 11; | |
3976 | uint32_t upper = | |
3977 | (S << 8) | (J2 << 7) | (J1 << 6) | (upper_insn & 0x003f); | |
3978 | uint32_t lower = (lower_insn & 0x07ff); | |
3979 | return utils::sign_extend<23>((upper << 12) | (lower << 1)); | |
3980 | } | |
3981 | ||
3982 | default: | |
3983 | gold_unreachable(); | |
3984 | } | |
3985 | } | |
3986 | ||
94cdfcff DK |
3987 | // A class to handle the PLT data. |
3988 | ||
3989 | template<bool big_endian> | |
3990 | class Output_data_plt_arm : public Output_section_data | |
3991 | { | |
3992 | public: | |
3993 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
3994 | Reloc_section; | |
3995 | ||
3996 | Output_data_plt_arm(Layout*, Output_data_space*); | |
3997 | ||
3998 | // Add an entry to the PLT. | |
3999 | void | |
4000 | add_entry(Symbol* gsym); | |
4001 | ||
4002 | // Return the .rel.plt section data. | |
4003 | const Reloc_section* | |
4004 | rel_plt() const | |
4005 | { return this->rel_; } | |
4006 | ||
4007 | protected: | |
4008 | void | |
4009 | do_adjust_output_section(Output_section* os); | |
4010 | ||
4011 | // Write to a map file. | |
4012 | void | |
4013 | do_print_to_mapfile(Mapfile* mapfile) const | |
4014 | { mapfile->print_output_data(this, _("** PLT")); } | |
4015 | ||
4016 | private: | |
4017 | // Template for the first PLT entry. | |
4018 | static const uint32_t first_plt_entry[5]; | |
4019 | ||
4020 | // Template for subsequent PLT entries. | |
4021 | static const uint32_t plt_entry[3]; | |
4022 | ||
4023 | // Set the final size. | |
4024 | void | |
4025 | set_final_data_size() | |
4026 | { | |
4027 | this->set_data_size(sizeof(first_plt_entry) | |
4028 | + this->count_ * sizeof(plt_entry)); | |
4029 | } | |
4030 | ||
4031 | // Write out the PLT data. | |
4032 | void | |
4033 | do_write(Output_file*); | |
4034 | ||
4035 | // The reloc section. | |
4036 | Reloc_section* rel_; | |
4037 | // The .got.plt section. | |
4038 | Output_data_space* got_plt_; | |
4039 | // The number of PLT entries. | |
4040 | unsigned int count_; | |
4041 | }; | |
4042 | ||
4043 | // Create the PLT section. The ordinary .got section is an argument, | |
4044 | // since we need to refer to the start. We also create our own .got | |
4045 | // section just for PLT entries. | |
4046 | ||
4047 | template<bool big_endian> | |
2ea97941 | 4048 | Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout, |
94cdfcff DK |
4049 | Output_data_space* got_plt) |
4050 | : Output_section_data(4), got_plt_(got_plt), count_(0) | |
4051 | { | |
4052 | this->rel_ = new Reloc_section(false); | |
2ea97941 ILT |
4053 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
4054 | elfcpp::SHF_ALLOC, this->rel_, true); | |
94cdfcff DK |
4055 | } |
4056 | ||
4057 | template<bool big_endian> | |
4058 | void | |
4059 | Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os) | |
4060 | { | |
4061 | os->set_entsize(0); | |
4062 | } | |
4063 | ||
4064 | // Add an entry to the PLT. | |
4065 | ||
4066 | template<bool big_endian> | |
4067 | void | |
4068 | Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym) | |
4069 | { | |
4070 | gold_assert(!gsym->has_plt_offset()); | |
4071 | ||
4072 | // Note that when setting the PLT offset we skip the initial | |
4073 | // reserved PLT entry. | |
4074 | gsym->set_plt_offset((this->count_) * sizeof(plt_entry) | |
4075 | + sizeof(first_plt_entry)); | |
4076 | ||
4077 | ++this->count_; | |
4078 | ||
4079 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
4080 | ||
4081 | // Every PLT entry needs a GOT entry which points back to the PLT | |
4082 | // entry (this will be changed by the dynamic linker, normally | |
4083 | // lazily when the function is called). | |
4084 | this->got_plt_->set_current_data_size(got_offset + 4); | |
4085 | ||
4086 | // Every PLT entry needs a reloc. | |
4087 | gsym->set_needs_dynsym_entry(); | |
4088 | this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_, | |
4089 | got_offset); | |
4090 | ||
4091 | // Note that we don't need to save the symbol. The contents of the | |
4092 | // PLT are independent of which symbols are used. The symbols only | |
4093 | // appear in the relocations. | |
4094 | } | |
4095 | ||
4096 | // ARM PLTs. | |
4097 | // FIXME: This is not very flexible. Right now this has only been tested | |
4098 | // on armv5te. If we are to support additional architecture features like | |
4099 | // Thumb-2 or BE8, we need to make this more flexible like GNU ld. | |
4100 | ||
4101 | // The first entry in the PLT. | |
4102 | template<bool big_endian> | |
4103 | const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] = | |
4104 | { | |
4105 | 0xe52de004, // str lr, [sp, #-4]! | |
4106 | 0xe59fe004, // ldr lr, [pc, #4] | |
4107 | 0xe08fe00e, // add lr, pc, lr | |
4108 | 0xe5bef008, // ldr pc, [lr, #8]! | |
4109 | 0x00000000, // &GOT[0] - . | |
4110 | }; | |
4111 | ||
4112 | // Subsequent entries in the PLT. | |
4113 | ||
4114 | template<bool big_endian> | |
4115 | const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] = | |
4116 | { | |
4117 | 0xe28fc600, // add ip, pc, #0xNN00000 | |
4118 | 0xe28cca00, // add ip, ip, #0xNN000 | |
4119 | 0xe5bcf000, // ldr pc, [ip, #0xNNN]! | |
4120 | }; | |
4121 | ||
4122 | // Write out the PLT. This uses the hand-coded instructions above, | |
4123 | // and adjusts them as needed. This is all specified by the arm ELF | |
4124 | // Processor Supplement. | |
4125 | ||
4126 | template<bool big_endian> | |
4127 | void | |
4128 | Output_data_plt_arm<big_endian>::do_write(Output_file* of) | |
4129 | { | |
2ea97941 | 4130 | const off_t offset = this->offset(); |
94cdfcff DK |
4131 | const section_size_type oview_size = |
4132 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 4133 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
94cdfcff DK |
4134 | |
4135 | const off_t got_file_offset = this->got_plt_->offset(); | |
4136 | const section_size_type got_size = | |
4137 | convert_to_section_size_type(this->got_plt_->data_size()); | |
4138 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
4139 | got_size); | |
4140 | unsigned char* pov = oview; | |
4141 | ||
ebabffbd DK |
4142 | Arm_address plt_address = this->address(); |
4143 | Arm_address got_address = this->got_plt_->address(); | |
94cdfcff DK |
4144 | |
4145 | // Write first PLT entry. All but the last word are constants. | |
4146 | const size_t num_first_plt_words = (sizeof(first_plt_entry) | |
4147 | / sizeof(plt_entry[0])); | |
4148 | for (size_t i = 0; i < num_first_plt_words - 1; i++) | |
4149 | elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]); | |
4150 | // Last word in first PLT entry is &GOT[0] - . | |
4151 | elfcpp::Swap<32, big_endian>::writeval(pov + 16, | |
4152 | got_address - (plt_address + 16)); | |
4153 | pov += sizeof(first_plt_entry); | |
4154 | ||
4155 | unsigned char* got_pov = got_view; | |
4156 | ||
4157 | memset(got_pov, 0, 12); | |
4158 | got_pov += 12; | |
4159 | ||
4160 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
4161 | unsigned int plt_offset = sizeof(first_plt_entry); | |
4162 | unsigned int plt_rel_offset = 0; | |
4163 | unsigned int got_offset = 12; | |
4164 | const unsigned int count = this->count_; | |
4165 | for (unsigned int i = 0; | |
4166 | i < count; | |
4167 | ++i, | |
4168 | pov += sizeof(plt_entry), | |
4169 | got_pov += 4, | |
4170 | plt_offset += sizeof(plt_entry), | |
4171 | plt_rel_offset += rel_size, | |
4172 | got_offset += 4) | |
4173 | { | |
4174 | // Set and adjust the PLT entry itself. | |
2ea97941 ILT |
4175 | int32_t offset = ((got_address + got_offset) |
4176 | - (plt_address + plt_offset + 8)); | |
94cdfcff | 4177 | |
2ea97941 ILT |
4178 | gold_assert(offset >= 0 && offset < 0x0fffffff); |
4179 | uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff); | |
94cdfcff | 4180 | elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0); |
2ea97941 | 4181 | uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff); |
94cdfcff | 4182 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1); |
2ea97941 | 4183 | uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff); |
94cdfcff DK |
4184 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2); |
4185 | ||
4186 | // Set the entry in the GOT. | |
4187 | elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address); | |
4188 | } | |
4189 | ||
4190 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
4191 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
4192 | ||
2ea97941 | 4193 | of->write_output_view(offset, oview_size, oview); |
94cdfcff DK |
4194 | of->write_output_view(got_file_offset, got_size, got_view); |
4195 | } | |
4196 | ||
4197 | // Create a PLT entry for a global symbol. | |
4198 | ||
4199 | template<bool big_endian> | |
4200 | void | |
2ea97941 | 4201 | Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
94cdfcff DK |
4202 | Symbol* gsym) |
4203 | { | |
4204 | if (gsym->has_plt_offset()) | |
4205 | return; | |
4206 | ||
4207 | if (this->plt_ == NULL) | |
4208 | { | |
4209 | // Create the GOT sections first. | |
2ea97941 | 4210 | this->got_section(symtab, layout); |
94cdfcff | 4211 | |
2ea97941 ILT |
4212 | this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_); |
4213 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
4214 | (elfcpp::SHF_ALLOC | |
4215 | | elfcpp::SHF_EXECINSTR), | |
4216 | this->plt_, false); | |
94cdfcff DK |
4217 | } |
4218 | this->plt_->add_entry(gsym); | |
4219 | } | |
4220 | ||
4a657b0d DK |
4221 | // Report an unsupported relocation against a local symbol. |
4222 | ||
4223 | template<bool big_endian> | |
4224 | void | |
4225 | Target_arm<big_endian>::Scan::unsupported_reloc_local( | |
4226 | Sized_relobj<32, big_endian>* object, | |
4227 | unsigned int r_type) | |
4228 | { | |
4229 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
4230 | object->name().c_str(), r_type); | |
4231 | } | |
4232 | ||
bec53400 DK |
4233 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
4234 | // dynamic linker does not support it, issue an error. The GNU linker | |
4235 | // only issues a non-PIC error for an allocated read-only section. | |
4236 | // Here we know the section is allocated, but we don't know that it is | |
4237 | // read-only. But we check for all the relocation types which the | |
4238 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
4239 | // error even if the section is not read-only. | |
4240 | ||
4241 | template<bool big_endian> | |
4242 | void | |
4243 | Target_arm<big_endian>::Scan::check_non_pic(Relobj* object, | |
4244 | unsigned int r_type) | |
4245 | { | |
4246 | switch (r_type) | |
4247 | { | |
4248 | // These are the relocation types supported by glibc for ARM. | |
4249 | case elfcpp::R_ARM_RELATIVE: | |
4250 | case elfcpp::R_ARM_COPY: | |
4251 | case elfcpp::R_ARM_GLOB_DAT: | |
4252 | case elfcpp::R_ARM_JUMP_SLOT: | |
4253 | case elfcpp::R_ARM_ABS32: | |
be8fcb75 | 4254 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
4255 | case elfcpp::R_ARM_PC24: |
4256 | // FIXME: The following 3 types are not supported by Android's dynamic | |
4257 | // linker. | |
4258 | case elfcpp::R_ARM_TLS_DTPMOD32: | |
4259 | case elfcpp::R_ARM_TLS_DTPOFF32: | |
4260 | case elfcpp::R_ARM_TLS_TPOFF32: | |
4261 | return; | |
4262 | ||
4263 | default: | |
4264 | // This prevents us from issuing more than one error per reloc | |
4265 | // section. But we can still wind up issuing more than one | |
4266 | // error per object file. | |
4267 | if (this->issued_non_pic_error_) | |
4268 | return; | |
4269 | object->error(_("requires unsupported dynamic reloc; " | |
4270 | "recompile with -fPIC")); | |
4271 | this->issued_non_pic_error_ = true; | |
4272 | return; | |
4273 | ||
4274 | case elfcpp::R_ARM_NONE: | |
4275 | gold_unreachable(); | |
4276 | } | |
4277 | } | |
4278 | ||
4a657b0d | 4279 | // Scan a relocation for a local symbol. |
bec53400 DK |
4280 | // FIXME: This only handles a subset of relocation types used by Android |
4281 | // on ARM v5te devices. | |
4a657b0d DK |
4282 | |
4283 | template<bool big_endian> | |
4284 | inline void | |
ad0f2072 | 4285 | Target_arm<big_endian>::Scan::local(Symbol_table* symtab, |
2ea97941 | 4286 | Layout* layout, |
bec53400 | 4287 | Target_arm* target, |
4a657b0d | 4288 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
4289 | unsigned int data_shndx, |
4290 | Output_section* output_section, | |
4291 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
4292 | unsigned int r_type, |
4293 | const elfcpp::Sym<32, big_endian>&) | |
4294 | { | |
a6d1ef57 | 4295 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
4296 | switch (r_type) |
4297 | { | |
4298 | case elfcpp::R_ARM_NONE: | |
4299 | break; | |
4300 | ||
bec53400 | 4301 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 4302 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
4303 | // If building a shared library (or a position-independent |
4304 | // executable), we need to create a dynamic relocation for | |
4305 | // this location. The relocation applied at link time will | |
4306 | // apply the link-time value, so we flag the location with | |
4307 | // an R_ARM_RELATIVE relocation so the dynamic loader can | |
4308 | // relocate it easily. | |
4309 | if (parameters->options().output_is_position_independent()) | |
4310 | { | |
2ea97941 | 4311 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4312 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
4313 | // If we are to add more other reloc types than R_ARM_ABS32, | |
4314 | // we need to add check_non_pic(object, r_type) here. | |
4315 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE, | |
4316 | output_section, data_shndx, | |
4317 | reloc.get_r_offset()); | |
4318 | } | |
4319 | break; | |
4320 | ||
4321 | case elfcpp::R_ARM_REL32: | |
4322 | case elfcpp::R_ARM_THM_CALL: | |
4323 | case elfcpp::R_ARM_CALL: | |
4324 | case elfcpp::R_ARM_PREL31: | |
4325 | case elfcpp::R_ARM_JUMP24: | |
4326 | case elfcpp::R_ARM_PLT32: | |
be8fcb75 ILT |
4327 | case elfcpp::R_ARM_THM_ABS5: |
4328 | case elfcpp::R_ARM_ABS8: | |
4329 | case elfcpp::R_ARM_ABS12: | |
4330 | case elfcpp::R_ARM_ABS16: | |
4331 | case elfcpp::R_ARM_BASE_ABS: | |
fd3c5f0b ILT |
4332 | case elfcpp::R_ARM_MOVW_ABS_NC: |
4333 | case elfcpp::R_ARM_MOVT_ABS: | |
4334 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
4335 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
4336 | case elfcpp::R_ARM_MOVW_PREL_NC: |
4337 | case elfcpp::R_ARM_MOVT_PREL: | |
4338 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
4339 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
bec53400 DK |
4340 | break; |
4341 | ||
4342 | case elfcpp::R_ARM_GOTOFF32: | |
4343 | // We need a GOT section: | |
2ea97941 | 4344 | target->got_section(symtab, layout); |
bec53400 DK |
4345 | break; |
4346 | ||
4347 | case elfcpp::R_ARM_BASE_PREL: | |
4348 | // FIXME: What about this? | |
4349 | break; | |
4350 | ||
4351 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 4352 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
4353 | { |
4354 | // The symbol requires a GOT entry. | |
4355 | Output_data_got<32, big_endian>* got = | |
2ea97941 | 4356 | target->got_section(symtab, layout); |
bec53400 DK |
4357 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
4358 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) | |
4359 | { | |
4360 | // If we are generating a shared object, we need to add a | |
4361 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
4362 | if (parameters->options().output_is_position_independent()) | |
4363 | { | |
2ea97941 ILT |
4364 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4365 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
bec53400 | 4366 | rel_dyn->add_local_relative( |
2ea97941 ILT |
4367 | object, r_sym, elfcpp::R_ARM_RELATIVE, got, |
4368 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
bec53400 DK |
4369 | } |
4370 | } | |
4371 | } | |
4372 | break; | |
4373 | ||
4374 | case elfcpp::R_ARM_TARGET1: | |
4375 | // This should have been mapped to another type already. | |
4376 | // Fall through. | |
4377 | case elfcpp::R_ARM_COPY: | |
4378 | case elfcpp::R_ARM_GLOB_DAT: | |
4379 | case elfcpp::R_ARM_JUMP_SLOT: | |
4380 | case elfcpp::R_ARM_RELATIVE: | |
4381 | // These are relocations which should only be seen by the | |
4382 | // dynamic linker, and should never be seen here. | |
4383 | gold_error(_("%s: unexpected reloc %u in object file"), | |
4384 | object->name().c_str(), r_type); | |
4385 | break; | |
4386 | ||
4a657b0d DK |
4387 | default: |
4388 | unsupported_reloc_local(object, r_type); | |
4389 | break; | |
4390 | } | |
4391 | } | |
4392 | ||
4393 | // Report an unsupported relocation against a global symbol. | |
4394 | ||
4395 | template<bool big_endian> | |
4396 | void | |
4397 | Target_arm<big_endian>::Scan::unsupported_reloc_global( | |
4398 | Sized_relobj<32, big_endian>* object, | |
4399 | unsigned int r_type, | |
4400 | Symbol* gsym) | |
4401 | { | |
4402 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
4403 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
4404 | } | |
4405 | ||
4406 | // Scan a relocation for a global symbol. | |
bec53400 DK |
4407 | // FIXME: This only handles a subset of relocation types used by Android |
4408 | // on ARM v5te devices. | |
4a657b0d DK |
4409 | |
4410 | template<bool big_endian> | |
4411 | inline void | |
ad0f2072 | 4412 | Target_arm<big_endian>::Scan::global(Symbol_table* symtab, |
2ea97941 | 4413 | Layout* layout, |
bec53400 | 4414 | Target_arm* target, |
4a657b0d | 4415 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
4416 | unsigned int data_shndx, |
4417 | Output_section* output_section, | |
4418 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
4419 | unsigned int r_type, |
4420 | Symbol* gsym) | |
4421 | { | |
a6d1ef57 | 4422 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
4423 | switch (r_type) |
4424 | { | |
4425 | case elfcpp::R_ARM_NONE: | |
4426 | break; | |
4427 | ||
bec53400 | 4428 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 4429 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
4430 | { |
4431 | // Make a dynamic relocation if necessary. | |
4432 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) | |
4433 | { | |
4434 | if (target->may_need_copy_reloc(gsym)) | |
4435 | { | |
2ea97941 | 4436 | target->copy_reloc(symtab, layout, object, |
bec53400 DK |
4437 | data_shndx, output_section, gsym, reloc); |
4438 | } | |
4439 | else if (gsym->can_use_relative_reloc(false)) | |
4440 | { | |
4441 | // If we are to add more other reloc types than R_ARM_ABS32, | |
4442 | // we need to add check_non_pic(object, r_type) here. | |
2ea97941 | 4443 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4444 | rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE, |
4445 | output_section, object, | |
4446 | data_shndx, reloc.get_r_offset()); | |
4447 | } | |
4448 | else | |
4449 | { | |
4450 | // If we are to add more other reloc types than R_ARM_ABS32, | |
4451 | // we need to add check_non_pic(object, r_type) here. | |
2ea97941 | 4452 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4453 | rel_dyn->add_global(gsym, r_type, output_section, object, |
4454 | data_shndx, reloc.get_r_offset()); | |
4455 | } | |
4456 | } | |
4457 | } | |
4458 | break; | |
4459 | ||
fd3c5f0b ILT |
4460 | case elfcpp::R_ARM_MOVW_ABS_NC: |
4461 | case elfcpp::R_ARM_MOVT_ABS: | |
4462 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
4463 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
4464 | case elfcpp::R_ARM_MOVW_PREL_NC: |
4465 | case elfcpp::R_ARM_MOVT_PREL: | |
4466 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
4467 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
fd3c5f0b ILT |
4468 | break; |
4469 | ||
be8fcb75 ILT |
4470 | case elfcpp::R_ARM_THM_ABS5: |
4471 | case elfcpp::R_ARM_ABS8: | |
4472 | case elfcpp::R_ARM_ABS12: | |
4473 | case elfcpp::R_ARM_ABS16: | |
4474 | case elfcpp::R_ARM_BASE_ABS: | |
4475 | { | |
4476 | // No dynamic relocs of this kinds. | |
4477 | // Report the error in case of PIC. | |
4478 | int flags = Symbol::NON_PIC_REF; | |
4479 | if (gsym->type() == elfcpp::STT_FUNC | |
4480 | || gsym->type() == elfcpp::STT_ARM_TFUNC) | |
4481 | flags |= Symbol::FUNCTION_CALL; | |
4482 | if (gsym->needs_dynamic_reloc(flags)) | |
4483 | check_non_pic(object, r_type); | |
4484 | } | |
4485 | break; | |
4486 | ||
bec53400 DK |
4487 | case elfcpp::R_ARM_REL32: |
4488 | case elfcpp::R_ARM_PREL31: | |
4489 | { | |
4490 | // Make a dynamic relocation if necessary. | |
4491 | int flags = Symbol::NON_PIC_REF; | |
4492 | if (gsym->needs_dynamic_reloc(flags)) | |
4493 | { | |
4494 | if (target->may_need_copy_reloc(gsym)) | |
4495 | { | |
2ea97941 | 4496 | target->copy_reloc(symtab, layout, object, |
bec53400 DK |
4497 | data_shndx, output_section, gsym, reloc); |
4498 | } | |
4499 | else | |
4500 | { | |
4501 | check_non_pic(object, r_type); | |
2ea97941 | 4502 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4503 | rel_dyn->add_global(gsym, r_type, output_section, object, |
4504 | data_shndx, reloc.get_r_offset()); | |
4505 | } | |
4506 | } | |
4507 | } | |
4508 | break; | |
4509 | ||
4510 | case elfcpp::R_ARM_JUMP24: | |
f4e5969c | 4511 | case elfcpp::R_ARM_THM_JUMP24: |
bec53400 | 4512 | case elfcpp::R_ARM_CALL: |
f4e5969c DK |
4513 | case elfcpp::R_ARM_THM_CALL: |
4514 | ||
4515 | if (Target_arm<big_endian>::Scan::symbol_needs_plt_entry(gsym)) | |
2ea97941 | 4516 | target->make_plt_entry(symtab, layout, gsym); |
f4e5969c DK |
4517 | else |
4518 | { | |
4519 | // Check to see if this is a function that would need a PLT | |
4520 | // but does not get one because the function symbol is untyped. | |
4521 | // This happens in assembly code missing a proper .type directive. | |
4522 | if ((!gsym->is_undefined() || parameters->options().shared()) | |
4523 | && !parameters->doing_static_link() | |
4524 | && gsym->type() == elfcpp::STT_NOTYPE | |
4525 | && (gsym->is_from_dynobj() | |
4526 | || gsym->is_undefined() | |
4527 | || gsym->is_preemptible())) | |
4528 | gold_error(_("%s is not a function."), | |
4529 | gsym->demangled_name().c_str()); | |
4530 | } | |
bec53400 DK |
4531 | break; |
4532 | ||
4533 | case elfcpp::R_ARM_PLT32: | |
4534 | // If the symbol is fully resolved, this is just a relative | |
4535 | // local reloc. Otherwise we need a PLT entry. | |
4536 | if (gsym->final_value_is_known()) | |
4537 | break; | |
4538 | // If building a shared library, we can also skip the PLT entry | |
4539 | // if the symbol is defined in the output file and is protected | |
4540 | // or hidden. | |
4541 | if (gsym->is_defined() | |
4542 | && !gsym->is_from_dynobj() | |
4543 | && !gsym->is_preemptible()) | |
4544 | break; | |
2ea97941 | 4545 | target->make_plt_entry(symtab, layout, gsym); |
bec53400 DK |
4546 | break; |
4547 | ||
4548 | case elfcpp::R_ARM_GOTOFF32: | |
4549 | // We need a GOT section. | |
2ea97941 | 4550 | target->got_section(symtab, layout); |
bec53400 DK |
4551 | break; |
4552 | ||
4553 | case elfcpp::R_ARM_BASE_PREL: | |
4554 | // FIXME: What about this? | |
4555 | break; | |
4556 | ||
4557 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 4558 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
4559 | { |
4560 | // The symbol requires a GOT entry. | |
4561 | Output_data_got<32, big_endian>* got = | |
2ea97941 | 4562 | target->got_section(symtab, layout); |
bec53400 DK |
4563 | if (gsym->final_value_is_known()) |
4564 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
4565 | else | |
4566 | { | |
4567 | // If this symbol is not fully resolved, we need to add a | |
4568 | // GOT entry with a dynamic relocation. | |
2ea97941 | 4569 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4570 | if (gsym->is_from_dynobj() |
4571 | || gsym->is_undefined() | |
4572 | || gsym->is_preemptible()) | |
4573 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, | |
4574 | rel_dyn, elfcpp::R_ARM_GLOB_DAT); | |
4575 | else | |
4576 | { | |
4577 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) | |
4578 | rel_dyn->add_global_relative( | |
4579 | gsym, elfcpp::R_ARM_RELATIVE, got, | |
4580 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
4581 | } | |
4582 | } | |
4583 | } | |
4584 | break; | |
4585 | ||
4586 | case elfcpp::R_ARM_TARGET1: | |
4587 | // This should have been mapped to another type already. | |
4588 | // Fall through. | |
4589 | case elfcpp::R_ARM_COPY: | |
4590 | case elfcpp::R_ARM_GLOB_DAT: | |
4591 | case elfcpp::R_ARM_JUMP_SLOT: | |
4592 | case elfcpp::R_ARM_RELATIVE: | |
4593 | // These are relocations which should only be seen by the | |
4594 | // dynamic linker, and should never be seen here. | |
4595 | gold_error(_("%s: unexpected reloc %u in object file"), | |
4596 | object->name().c_str(), r_type); | |
4597 | break; | |
4598 | ||
4a657b0d DK |
4599 | default: |
4600 | unsupported_reloc_global(object, r_type, gsym); | |
4601 | break; | |
4602 | } | |
4603 | } | |
4604 | ||
4605 | // Process relocations for gc. | |
4606 | ||
4607 | template<bool big_endian> | |
4608 | void | |
ad0f2072 | 4609 | Target_arm<big_endian>::gc_process_relocs(Symbol_table* symtab, |
2ea97941 | 4610 | Layout* layout, |
4a657b0d DK |
4611 | Sized_relobj<32, big_endian>* object, |
4612 | unsigned int data_shndx, | |
4613 | unsigned int, | |
4614 | const unsigned char* prelocs, | |
4615 | size_t reloc_count, | |
4616 | Output_section* output_section, | |
4617 | bool needs_special_offset_handling, | |
4618 | size_t local_symbol_count, | |
4619 | const unsigned char* plocal_symbols) | |
4620 | { | |
4621 | typedef Target_arm<big_endian> Arm; | |
2ea97941 | 4622 | typedef typename Target_arm<big_endian>::Scan Scan; |
4a657b0d | 4623 | |
2ea97941 | 4624 | gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>( |
4a657b0d | 4625 | symtab, |
2ea97941 | 4626 | layout, |
4a657b0d DK |
4627 | this, |
4628 | object, | |
4629 | data_shndx, | |
4630 | prelocs, | |
4631 | reloc_count, | |
4632 | output_section, | |
4633 | needs_special_offset_handling, | |
4634 | local_symbol_count, | |
4635 | plocal_symbols); | |
4636 | } | |
4637 | ||
4638 | // Scan relocations for a section. | |
4639 | ||
4640 | template<bool big_endian> | |
4641 | void | |
ad0f2072 | 4642 | Target_arm<big_endian>::scan_relocs(Symbol_table* symtab, |
2ea97941 | 4643 | Layout* layout, |
4a657b0d DK |
4644 | Sized_relobj<32, big_endian>* object, |
4645 | unsigned int data_shndx, | |
4646 | unsigned int sh_type, | |
4647 | const unsigned char* prelocs, | |
4648 | size_t reloc_count, | |
4649 | Output_section* output_section, | |
4650 | bool needs_special_offset_handling, | |
4651 | size_t local_symbol_count, | |
4652 | const unsigned char* plocal_symbols) | |
4653 | { | |
2ea97941 | 4654 | typedef typename Target_arm<big_endian>::Scan Scan; |
4a657b0d DK |
4655 | if (sh_type == elfcpp::SHT_RELA) |
4656 | { | |
4657 | gold_error(_("%s: unsupported RELA reloc section"), | |
4658 | object->name().c_str()); | |
4659 | return; | |
4660 | } | |
4661 | ||
2ea97941 | 4662 | gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>( |
4a657b0d | 4663 | symtab, |
2ea97941 | 4664 | layout, |
4a657b0d DK |
4665 | this, |
4666 | object, | |
4667 | data_shndx, | |
4668 | prelocs, | |
4669 | reloc_count, | |
4670 | output_section, | |
4671 | needs_special_offset_handling, | |
4672 | local_symbol_count, | |
4673 | plocal_symbols); | |
4674 | } | |
4675 | ||
4676 | // Finalize the sections. | |
4677 | ||
4678 | template<bool big_endian> | |
4679 | void | |
d5b40221 | 4680 | Target_arm<big_endian>::do_finalize_sections( |
2ea97941 | 4681 | Layout* layout, |
f59f41f3 DK |
4682 | const Input_objects* input_objects, |
4683 | Symbol_table* symtab) | |
4a657b0d | 4684 | { |
d5b40221 DK |
4685 | // Merge processor-specific flags. |
4686 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
4687 | p != input_objects->relobj_end(); | |
4688 | ++p) | |
4689 | { | |
4690 | Arm_relobj<big_endian>* arm_relobj = | |
4691 | Arm_relobj<big_endian>::as_arm_relobj(*p); | |
4692 | this->merge_processor_specific_flags( | |
4693 | arm_relobj->name(), | |
4694 | arm_relobj->processor_specific_flags()); | |
a0351a69 DK |
4695 | this->merge_object_attributes(arm_relobj->name().c_str(), |
4696 | arm_relobj->attributes_section_data()); | |
4697 | ||
d5b40221 DK |
4698 | } |
4699 | ||
4700 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); | |
4701 | p != input_objects->dynobj_end(); | |
4702 | ++p) | |
4703 | { | |
4704 | Arm_dynobj<big_endian>* arm_dynobj = | |
4705 | Arm_dynobj<big_endian>::as_arm_dynobj(*p); | |
4706 | this->merge_processor_specific_flags( | |
4707 | arm_dynobj->name(), | |
4708 | arm_dynobj->processor_specific_flags()); | |
a0351a69 DK |
4709 | this->merge_object_attributes(arm_dynobj->name().c_str(), |
4710 | arm_dynobj->attributes_section_data()); | |
d5b40221 DK |
4711 | } |
4712 | ||
a0351a69 DK |
4713 | // Check BLX use. |
4714 | Object_attribute* attr = | |
4715 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
4716 | if (attr->int_value() > elfcpp::TAG_CPU_ARCH_V4) | |
4717 | this->set_may_use_blx(true); | |
4718 | ||
94cdfcff | 4719 | // Fill in some more dynamic tags. |
2ea97941 | 4720 | Output_data_dynamic* const odyn = layout->dynamic_data(); |
94cdfcff DK |
4721 | if (odyn != NULL) |
4722 | { | |
22b127cc ILT |
4723 | if (this->got_plt_ != NULL |
4724 | && this->got_plt_->output_section() != NULL) | |
94cdfcff DK |
4725 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); |
4726 | ||
22b127cc ILT |
4727 | if (this->plt_ != NULL |
4728 | && this->plt_->output_section() != NULL) | |
94cdfcff DK |
4729 | { |
4730 | const Output_data* od = this->plt_->rel_plt(); | |
4731 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
4732 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
4733 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_REL); | |
4734 | } | |
4735 | ||
22b127cc ILT |
4736 | if (this->rel_dyn_ != NULL |
4737 | && this->rel_dyn_->output_section() != NULL) | |
94cdfcff DK |
4738 | { |
4739 | const Output_data* od = this->rel_dyn_; | |
4740 | odyn->add_section_address(elfcpp::DT_REL, od); | |
4741 | odyn->add_section_size(elfcpp::DT_RELSZ, od); | |
4742 | odyn->add_constant(elfcpp::DT_RELENT, | |
4743 | elfcpp::Elf_sizes<32>::rel_size); | |
4744 | } | |
4745 | ||
4746 | if (!parameters->options().shared()) | |
4747 | { | |
4748 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
4749 | // linker at run time, and used by the debugger. | |
4750 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
4751 | } | |
4752 | } | |
4753 | ||
4754 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
4755 | // relocs. | |
4756 | if (this->copy_relocs_.any_saved_relocs()) | |
2ea97941 | 4757 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); |
11af873f | 4758 | |
f59f41f3 | 4759 | // Handle the .ARM.exidx section. |
2ea97941 | 4760 | Output_section* exidx_section = layout->find_output_section(".ARM.exidx"); |
f59f41f3 DK |
4761 | if (exidx_section != NULL |
4762 | && exidx_section->type() == elfcpp::SHT_ARM_EXIDX | |
11af873f DK |
4763 | && !parameters->options().relocatable()) |
4764 | { | |
f59f41f3 DK |
4765 | // Create __exidx_start and __exdix_end symbols. |
4766 | symtab->define_in_output_data("__exidx_start", NULL, exidx_section, | |
4767 | 0, 0, elfcpp::STT_OBJECT, | |
a0351a69 | 4768 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, |
f59f41f3 DK |
4769 | false, false); |
4770 | symtab->define_in_output_data("__exidx_end", NULL, exidx_section, | |
4771 | 0, 0, elfcpp::STT_OBJECT, | |
a0351a69 | 4772 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, |
f59f41f3 | 4773 | true, false); |
11af873f | 4774 | |
f59f41f3 DK |
4775 | // For the ARM target, we need to add a PT_ARM_EXIDX segment for |
4776 | // the .ARM.exidx section. | |
2ea97941 | 4777 | if (!layout->script_options()->saw_phdrs_clause()) |
11af873f | 4778 | { |
2ea97941 | 4779 | gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0, 0) |
11af873f DK |
4780 | == NULL); |
4781 | Output_segment* exidx_segment = | |
2ea97941 | 4782 | layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R); |
f5c870d2 ILT |
4783 | exidx_segment->add_output_section(exidx_section, elfcpp::PF_R, |
4784 | false); | |
11af873f DK |
4785 | } |
4786 | } | |
a0351a69 DK |
4787 | |
4788 | // Create an .ARM.attributes section if there is not one already. | |
2ea97941 | 4789 | Output_attributes_section_data* attributes_section = |
a0351a69 | 4790 | new Output_attributes_section_data(*this->attributes_section_data_); |
2ea97941 ILT |
4791 | layout->add_output_section_data(".ARM.attributes", |
4792 | elfcpp::SHT_ARM_ATTRIBUTES, 0, | |
4793 | attributes_section, false); | |
4a657b0d DK |
4794 | } |
4795 | ||
bec53400 DK |
4796 | // Return whether a direct absolute static relocation needs to be applied. |
4797 | // In cases where Scan::local() or Scan::global() has created | |
4798 | // a dynamic relocation other than R_ARM_RELATIVE, the addend | |
4799 | // of the relocation is carried in the data, and we must not | |
4800 | // apply the static relocation. | |
4801 | ||
4802 | template<bool big_endian> | |
4803 | inline bool | |
4804 | Target_arm<big_endian>::Relocate::should_apply_static_reloc( | |
4805 | const Sized_symbol<32>* gsym, | |
4806 | int ref_flags, | |
4807 | bool is_32bit, | |
4808 | Output_section* output_section) | |
4809 | { | |
4810 | // If the output section is not allocated, then we didn't call | |
4811 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
4812 | // the reloc here. | |
4813 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
4814 | return true; | |
4815 | ||
4816 | // For local symbols, we will have created a non-RELATIVE dynamic | |
4817 | // relocation only if (a) the output is position independent, | |
4818 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
4819 | // (c) the relocation is not 32 bits wide. | |
4820 | if (gsym == NULL) | |
4821 | return !(parameters->options().output_is_position_independent() | |
4822 | && (ref_flags & Symbol::ABSOLUTE_REF) | |
4823 | && !is_32bit); | |
4824 | ||
4825 | // For global symbols, we use the same helper routines used in the | |
4826 | // scan pass. If we did not create a dynamic relocation, or if we | |
4827 | // created a RELATIVE dynamic relocation, we should apply the static | |
4828 | // relocation. | |
4829 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
4830 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
4831 | && gsym->can_use_relative_reloc(ref_flags | |
4832 | & Symbol::FUNCTION_CALL); | |
4833 | return !has_dyn || is_rel; | |
4834 | } | |
4835 | ||
4a657b0d DK |
4836 | // Perform a relocation. |
4837 | ||
4838 | template<bool big_endian> | |
4839 | inline bool | |
4840 | Target_arm<big_endian>::Relocate::relocate( | |
c121c671 DK |
4841 | const Relocate_info<32, big_endian>* relinfo, |
4842 | Target_arm* target, | |
4843 | Output_section *output_section, | |
4844 | size_t relnum, | |
4845 | const elfcpp::Rel<32, big_endian>& rel, | |
4a657b0d | 4846 | unsigned int r_type, |
c121c671 DK |
4847 | const Sized_symbol<32>* gsym, |
4848 | const Symbol_value<32>* psymval, | |
4849 | unsigned char* view, | |
ebabffbd | 4850 | Arm_address address, |
4a657b0d DK |
4851 | section_size_type /* view_size */ ) |
4852 | { | |
c121c671 DK |
4853 | typedef Arm_relocate_functions<big_endian> Arm_relocate_functions; |
4854 | ||
a6d1ef57 | 4855 | r_type = get_real_reloc_type(r_type); |
c121c671 | 4856 | |
2daedcd6 DK |
4857 | const Arm_relobj<big_endian>* object = |
4858 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
c121c671 | 4859 | |
2daedcd6 DK |
4860 | // If the final branch target of a relocation is THUMB instruction, this |
4861 | // is 1. Otherwise it is 0. | |
4862 | Arm_address thumb_bit = 0; | |
c121c671 | 4863 | Symbol_value<32> symval; |
d204b6e9 | 4864 | bool is_weakly_undefined_without_plt = false; |
2daedcd6 | 4865 | if (relnum != Target_arm<big_endian>::fake_relnum_for_stubs) |
c121c671 | 4866 | { |
2daedcd6 DK |
4867 | if (gsym != NULL) |
4868 | { | |
4869 | // This is a global symbol. Determine if we use PLT and if the | |
4870 | // final target is THUMB. | |
4871 | if (gsym->use_plt_offset(reloc_is_non_pic(r_type))) | |
4872 | { | |
4873 | // This uses a PLT, change the symbol value. | |
4874 | symval.set_output_value(target->plt_section()->address() | |
4875 | + gsym->plt_offset()); | |
4876 | psymval = &symval; | |
4877 | } | |
d204b6e9 DK |
4878 | else if (gsym->is_weak_undefined()) |
4879 | { | |
4880 | // This is a weakly undefined symbol and we do not use PLT | |
4881 | // for this relocation. A branch targeting this symbol will | |
4882 | // be converted into an NOP. | |
4883 | is_weakly_undefined_without_plt = true; | |
4884 | } | |
2daedcd6 DK |
4885 | else |
4886 | { | |
4887 | // Set thumb bit if symbol: | |
4888 | // -Has type STT_ARM_TFUNC or | |
4889 | // -Has type STT_FUNC, is defined and with LSB in value set. | |
4890 | thumb_bit = | |
4891 | (((gsym->type() == elfcpp::STT_ARM_TFUNC) | |
4892 | || (gsym->type() == elfcpp::STT_FUNC | |
4893 | && !gsym->is_undefined() | |
4894 | && ((psymval->value(object, 0) & 1) != 0))) | |
4895 | ? 1 | |
4896 | : 0); | |
4897 | } | |
4898 | } | |
4899 | else | |
4900 | { | |
4901 | // This is a local symbol. Determine if the final target is THUMB. | |
4902 | // We saved this information when all the local symbols were read. | |
4903 | elfcpp::Elf_types<32>::Elf_WXword r_info = rel.get_r_info(); | |
4904 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
4905 | thumb_bit = object->local_symbol_is_thumb_function(r_sym) ? 1 : 0; | |
4906 | } | |
4907 | } | |
4908 | else | |
4909 | { | |
4910 | // This is a fake relocation synthesized for a stub. It does not have | |
4911 | // a real symbol. We just look at the LSB of the symbol value to | |
4912 | // determine if the target is THUMB or not. | |
4913 | thumb_bit = ((psymval->value(object, 0) & 1) != 0); | |
c121c671 DK |
4914 | } |
4915 | ||
2daedcd6 DK |
4916 | // Strip LSB if this points to a THUMB target. |
4917 | if (thumb_bit != 0 | |
4918 | && Target_arm<big_endian>::reloc_uses_thumb_bit(r_type) | |
4919 | && ((psymval->value(object, 0) & 1) != 0)) | |
4920 | { | |
4921 | Arm_address stripped_value = | |
4922 | psymval->value(object, 0) & ~static_cast<Arm_address>(1); | |
4923 | symval.set_output_value(stripped_value); | |
4924 | psymval = &symval; | |
4925 | } | |
4926 | ||
c121c671 DK |
4927 | // Get the GOT offset if needed. |
4928 | // The GOT pointer points to the end of the GOT section. | |
4929 | // We need to subtract the size of the GOT section to get | |
4930 | // the actual offset to use in the relocation. | |
4931 | bool have_got_offset = false; | |
4932 | unsigned int got_offset = 0; | |
4933 | switch (r_type) | |
4934 | { | |
4935 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 4936 | case elfcpp::R_ARM_GOT_PREL: |
c121c671 DK |
4937 | if (gsym != NULL) |
4938 | { | |
4939 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
4940 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
4941 | - target->got_size()); | |
4942 | } | |
4943 | else | |
4944 | { | |
4945 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
4946 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
4947 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
4948 | - target->got_size()); | |
4949 | } | |
4950 | have_got_offset = true; | |
4951 | break; | |
4952 | ||
4953 | default: | |
4954 | break; | |
4955 | } | |
4956 | ||
d204b6e9 DK |
4957 | // To look up relocation stubs, we need to pass the symbol table index of |
4958 | // a local symbol. | |
4959 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
4960 | ||
c121c671 DK |
4961 | typename Arm_relocate_functions::Status reloc_status = |
4962 | Arm_relocate_functions::STATUS_OKAY; | |
4a657b0d DK |
4963 | switch (r_type) |
4964 | { | |
4965 | case elfcpp::R_ARM_NONE: | |
4966 | break; | |
4967 | ||
5e445df6 ILT |
4968 | case elfcpp::R_ARM_ABS8: |
4969 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
4970 | output_section)) | |
be8fcb75 ILT |
4971 | reloc_status = Arm_relocate_functions::abs8(view, object, psymval); |
4972 | break; | |
4973 | ||
4974 | case elfcpp::R_ARM_ABS12: | |
4975 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
4976 | output_section)) | |
4977 | reloc_status = Arm_relocate_functions::abs12(view, object, psymval); | |
4978 | break; | |
4979 | ||
4980 | case elfcpp::R_ARM_ABS16: | |
4981 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
4982 | output_section)) | |
4983 | reloc_status = Arm_relocate_functions::abs16(view, object, psymval); | |
5e445df6 ILT |
4984 | break; |
4985 | ||
c121c671 DK |
4986 | case elfcpp::R_ARM_ABS32: |
4987 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
4988 | output_section)) | |
4989 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
2daedcd6 | 4990 | thumb_bit); |
c121c671 DK |
4991 | break; |
4992 | ||
be8fcb75 ILT |
4993 | case elfcpp::R_ARM_ABS32_NOI: |
4994 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
4995 | output_section)) | |
4996 | // No thumb bit for this relocation: (S + A) | |
4997 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
f4e5969c | 4998 | 0); |
be8fcb75 ILT |
4999 | break; |
5000 | ||
fd3c5f0b ILT |
5001 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5002 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5003 | output_section)) | |
5004 | reloc_status = Arm_relocate_functions::movw_abs_nc(view, object, | |
5005 | psymval, | |
2daedcd6 | 5006 | thumb_bit); |
fd3c5f0b ILT |
5007 | else |
5008 | gold_error(_("relocation R_ARM_MOVW_ABS_NC cannot be used when making" | |
5009 | "a shared object; recompile with -fPIC")); | |
5010 | break; | |
5011 | ||
5012 | case elfcpp::R_ARM_MOVT_ABS: | |
5013 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5014 | output_section)) | |
5015 | reloc_status = Arm_relocate_functions::movt_abs(view, object, psymval); | |
5016 | else | |
5017 | gold_error(_("relocation R_ARM_MOVT_ABS cannot be used when making" | |
5018 | "a shared object; recompile with -fPIC")); | |
5019 | break; | |
5020 | ||
5021 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5022 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5023 | output_section)) | |
5024 | reloc_status = Arm_relocate_functions::thm_movw_abs_nc(view, object, | |
5025 | psymval, | |
2daedcd6 | 5026 | thumb_bit); |
fd3c5f0b ILT |
5027 | else |
5028 | gold_error(_("relocation R_ARM_THM_MOVW_ABS_NC cannot be used when" | |
5029 | "making a shared object; recompile with -fPIC")); | |
5030 | break; | |
5031 | ||
5032 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
5033 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5034 | output_section)) | |
5035 | reloc_status = Arm_relocate_functions::thm_movt_abs(view, object, | |
5036 | psymval); | |
5037 | else | |
5038 | gold_error(_("relocation R_ARM_THM_MOVT_ABS cannot be used when" | |
5039 | "making a shared object; recompile with -fPIC")); | |
5040 | break; | |
5041 | ||
c2a122b6 ILT |
5042 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5043 | reloc_status = Arm_relocate_functions::movw_prel_nc(view, object, | |
5044 | psymval, address, | |
2daedcd6 | 5045 | thumb_bit); |
c2a122b6 ILT |
5046 | break; |
5047 | ||
5048 | case elfcpp::R_ARM_MOVT_PREL: | |
5049 | reloc_status = Arm_relocate_functions::movt_prel(view, object, | |
5050 | psymval, address); | |
5051 | break; | |
5052 | ||
5053 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5054 | reloc_status = Arm_relocate_functions::thm_movw_prel_nc(view, object, | |
5055 | psymval, address, | |
2daedcd6 | 5056 | thumb_bit); |
c2a122b6 ILT |
5057 | break; |
5058 | ||
5059 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
5060 | reloc_status = Arm_relocate_functions::thm_movt_prel(view, object, | |
5061 | psymval, address); | |
5062 | break; | |
5063 | ||
c121c671 DK |
5064 | case elfcpp::R_ARM_REL32: |
5065 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
2daedcd6 | 5066 | address, thumb_bit); |
c121c671 DK |
5067 | break; |
5068 | ||
be8fcb75 ILT |
5069 | case elfcpp::R_ARM_THM_ABS5: |
5070 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5071 | output_section)) | |
5072 | reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval); | |
5073 | break; | |
5074 | ||
c121c671 | 5075 | case elfcpp::R_ARM_THM_CALL: |
51938283 DK |
5076 | reloc_status = |
5077 | Arm_relocate_functions::thm_call(relinfo, view, gsym, object, r_sym, | |
5078 | psymval, address, thumb_bit, | |
5079 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5080 | break; |
5081 | ||
d204b6e9 DK |
5082 | case elfcpp::R_ARM_XPC25: |
5083 | reloc_status = | |
5084 | Arm_relocate_functions::xpc25(relinfo, view, gsym, object, r_sym, | |
5085 | psymval, address, thumb_bit, | |
5086 | is_weakly_undefined_without_plt); | |
5087 | break; | |
5088 | ||
51938283 DK |
5089 | case elfcpp::R_ARM_THM_XPC22: |
5090 | reloc_status = | |
5091 | Arm_relocate_functions::thm_xpc22(relinfo, view, gsym, object, r_sym, | |
5092 | psymval, address, thumb_bit, | |
5093 | is_weakly_undefined_without_plt); | |
5094 | break; | |
5095 | ||
c121c671 DK |
5096 | case elfcpp::R_ARM_GOTOFF32: |
5097 | { | |
ebabffbd | 5098 | Arm_address got_origin; |
c121c671 DK |
5099 | got_origin = target->got_plt_section()->address(); |
5100 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
2daedcd6 | 5101 | got_origin, thumb_bit); |
c121c671 DK |
5102 | } |
5103 | break; | |
5104 | ||
5105 | case elfcpp::R_ARM_BASE_PREL: | |
5106 | { | |
5107 | uint32_t origin; | |
5108 | // Get the addressing origin of the output segment defining the | |
5109 | // symbol gsym (AAELF 4.6.1.2 Relocation types) | |
5110 | gold_assert(gsym != NULL); | |
5111 | if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
5112 | origin = gsym->output_segment()->vaddr(); | |
5113 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
5114 | origin = gsym->output_data()->address(); | |
5115 | else | |
5116 | { | |
5117 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5118 | _("cannot find origin of R_ARM_BASE_PREL")); | |
5119 | return true; | |
5120 | } | |
5121 | reloc_status = Arm_relocate_functions::base_prel(view, origin, address); | |
5122 | } | |
5123 | break; | |
5124 | ||
be8fcb75 ILT |
5125 | case elfcpp::R_ARM_BASE_ABS: |
5126 | { | |
5127 | if (!should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5128 | output_section)) | |
5129 | break; | |
5130 | ||
5131 | uint32_t origin; | |
5132 | // Get the addressing origin of the output segment defining | |
5133 | // the symbol gsym (AAELF 4.6.1.2 Relocation types). | |
5134 | if (gsym == NULL) | |
5135 | // R_ARM_BASE_ABS with the NULL symbol will give the | |
5136 | // absolute address of the GOT origin (GOT_ORG) (see ARM IHI | |
5137 | // 0044C (AAELF): 4.6.1.8 Proxy generating relocations). | |
5138 | origin = target->got_plt_section()->address(); | |
5139 | else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
5140 | origin = gsym->output_segment()->vaddr(); | |
5141 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
5142 | origin = gsym->output_data()->address(); | |
5143 | else | |
5144 | { | |
5145 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5146 | _("cannot find origin of R_ARM_BASE_ABS")); | |
5147 | return true; | |
5148 | } | |
5149 | ||
5150 | reloc_status = Arm_relocate_functions::base_abs(view, origin); | |
5151 | } | |
5152 | break; | |
5153 | ||
c121c671 DK |
5154 | case elfcpp::R_ARM_GOT_BREL: |
5155 | gold_assert(have_got_offset); | |
5156 | reloc_status = Arm_relocate_functions::got_brel(view, got_offset); | |
5157 | break; | |
5158 | ||
7f5309a5 ILT |
5159 | case elfcpp::R_ARM_GOT_PREL: |
5160 | gold_assert(have_got_offset); | |
5161 | // Get the address origin for GOT PLT, which is allocated right | |
5162 | // after the GOT section, to calculate an absolute address of | |
5163 | // the symbol GOT entry (got_origin + got_offset). | |
ebabffbd | 5164 | Arm_address got_origin; |
7f5309a5 ILT |
5165 | got_origin = target->got_plt_section()->address(); |
5166 | reloc_status = Arm_relocate_functions::got_prel(view, | |
5167 | got_origin + got_offset, | |
5168 | address); | |
5169 | break; | |
5170 | ||
c121c671 DK |
5171 | case elfcpp::R_ARM_PLT32: |
5172 | gold_assert(gsym == NULL | |
5173 | || gsym->has_plt_offset() | |
5174 | || gsym->final_value_is_known() | |
5175 | || (gsym->is_defined() | |
5176 | && !gsym->is_from_dynobj() | |
5177 | && !gsym->is_preemptible())); | |
d204b6e9 DK |
5178 | reloc_status = |
5179 | Arm_relocate_functions::plt32(relinfo, view, gsym, object, r_sym, | |
5180 | psymval, address, thumb_bit, | |
5181 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5182 | break; |
5183 | ||
5184 | case elfcpp::R_ARM_CALL: | |
d204b6e9 DK |
5185 | reloc_status = |
5186 | Arm_relocate_functions::call(relinfo, view, gsym, object, r_sym, | |
5187 | psymval, address, thumb_bit, | |
5188 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5189 | break; |
5190 | ||
5191 | case elfcpp::R_ARM_JUMP24: | |
d204b6e9 DK |
5192 | reloc_status = |
5193 | Arm_relocate_functions::jump24(relinfo, view, gsym, object, r_sym, | |
5194 | psymval, address, thumb_bit, | |
5195 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5196 | break; |
5197 | ||
51938283 DK |
5198 | case elfcpp::R_ARM_THM_JUMP24: |
5199 | reloc_status = | |
5200 | Arm_relocate_functions::thm_jump24(relinfo, view, gsym, object, r_sym, | |
5201 | psymval, address, thumb_bit, | |
5202 | is_weakly_undefined_without_plt); | |
5203 | break; | |
5204 | ||
c121c671 DK |
5205 | case elfcpp::R_ARM_PREL31: |
5206 | reloc_status = Arm_relocate_functions::prel31(view, object, psymval, | |
2daedcd6 | 5207 | address, thumb_bit); |
c121c671 DK |
5208 | break; |
5209 | ||
5210 | case elfcpp::R_ARM_TARGET1: | |
5211 | // This should have been mapped to another type already. | |
5212 | // Fall through. | |
5213 | case elfcpp::R_ARM_COPY: | |
5214 | case elfcpp::R_ARM_GLOB_DAT: | |
5215 | case elfcpp::R_ARM_JUMP_SLOT: | |
5216 | case elfcpp::R_ARM_RELATIVE: | |
5217 | // These are relocations which should only be seen by the | |
5218 | // dynamic linker, and should never be seen here. | |
5219 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5220 | _("unexpected reloc %u in object file"), | |
5221 | r_type); | |
5222 | break; | |
5223 | ||
5224 | default: | |
5225 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5226 | _("unsupported reloc %u"), | |
5227 | r_type); | |
5228 | break; | |
5229 | } | |
5230 | ||
5231 | // Report any errors. | |
5232 | switch (reloc_status) | |
5233 | { | |
5234 | case Arm_relocate_functions::STATUS_OKAY: | |
5235 | break; | |
5236 | case Arm_relocate_functions::STATUS_OVERFLOW: | |
5237 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5238 | _("relocation overflow in relocation %u"), | |
5239 | r_type); | |
5240 | break; | |
5241 | case Arm_relocate_functions::STATUS_BAD_RELOC: | |
5242 | gold_error_at_location( | |
5243 | relinfo, | |
5244 | relnum, | |
5245 | rel.get_r_offset(), | |
5246 | _("unexpected opcode while processing relocation %u"), | |
5247 | r_type); | |
5248 | break; | |
4a657b0d DK |
5249 | default: |
5250 | gold_unreachable(); | |
5251 | } | |
5252 | ||
5253 | return true; | |
5254 | } | |
5255 | ||
5256 | // Relocate section data. | |
5257 | ||
5258 | template<bool big_endian> | |
5259 | void | |
5260 | Target_arm<big_endian>::relocate_section( | |
5261 | const Relocate_info<32, big_endian>* relinfo, | |
5262 | unsigned int sh_type, | |
5263 | const unsigned char* prelocs, | |
5264 | size_t reloc_count, | |
5265 | Output_section* output_section, | |
5266 | bool needs_special_offset_handling, | |
5267 | unsigned char* view, | |
ebabffbd | 5268 | Arm_address address, |
364c7fa5 ILT |
5269 | section_size_type view_size, |
5270 | const Reloc_symbol_changes* reloc_symbol_changes) | |
4a657b0d DK |
5271 | { |
5272 | typedef typename Target_arm<big_endian>::Relocate Arm_relocate; | |
5273 | gold_assert(sh_type == elfcpp::SHT_REL); | |
5274 | ||
43d12afe DK |
5275 | Arm_input_section<big_endian>* arm_input_section = |
5276 | this->find_arm_input_section(relinfo->object, relinfo->data_shndx); | |
5277 | ||
5278 | // This is an ARM input section and the view covers the whole output | |
5279 | // section. | |
5280 | if (arm_input_section != NULL) | |
5281 | { | |
5282 | gold_assert(needs_special_offset_handling); | |
5283 | Arm_address section_address = arm_input_section->address(); | |
5284 | section_size_type section_size = arm_input_section->data_size(); | |
5285 | ||
5286 | gold_assert((arm_input_section->address() >= address) | |
5287 | && ((arm_input_section->address() | |
5288 | + arm_input_section->data_size()) | |
5289 | <= (address + view_size))); | |
5290 | ||
2ea97941 ILT |
5291 | off_t offset = section_address - address; |
5292 | view += offset; | |
5293 | address += offset; | |
43d12afe DK |
5294 | view_size = section_size; |
5295 | } | |
5296 | ||
4a657b0d DK |
5297 | gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL, |
5298 | Arm_relocate>( | |
5299 | relinfo, | |
5300 | this, | |
5301 | prelocs, | |
5302 | reloc_count, | |
5303 | output_section, | |
5304 | needs_special_offset_handling, | |
5305 | view, | |
5306 | address, | |
364c7fa5 ILT |
5307 | view_size, |
5308 | reloc_symbol_changes); | |
4a657b0d DK |
5309 | } |
5310 | ||
5311 | // Return the size of a relocation while scanning during a relocatable | |
5312 | // link. | |
5313 | ||
5314 | template<bool big_endian> | |
5315 | unsigned int | |
5316 | Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
5317 | unsigned int r_type, | |
5318 | Relobj* object) | |
5319 | { | |
a6d1ef57 | 5320 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
5321 | switch (r_type) |
5322 | { | |
5323 | case elfcpp::R_ARM_NONE: | |
5324 | return 0; | |
5325 | ||
5e445df6 ILT |
5326 | case elfcpp::R_ARM_ABS8: |
5327 | return 1; | |
5328 | ||
be8fcb75 ILT |
5329 | case elfcpp::R_ARM_ABS16: |
5330 | case elfcpp::R_ARM_THM_ABS5: | |
5331 | return 2; | |
5332 | ||
4a657b0d | 5333 | case elfcpp::R_ARM_ABS32: |
be8fcb75 ILT |
5334 | case elfcpp::R_ARM_ABS32_NOI: |
5335 | case elfcpp::R_ARM_ABS12: | |
5336 | case elfcpp::R_ARM_BASE_ABS: | |
4a657b0d DK |
5337 | case elfcpp::R_ARM_REL32: |
5338 | case elfcpp::R_ARM_THM_CALL: | |
5339 | case elfcpp::R_ARM_GOTOFF32: | |
5340 | case elfcpp::R_ARM_BASE_PREL: | |
5341 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5342 | case elfcpp::R_ARM_GOT_PREL: |
4a657b0d DK |
5343 | case elfcpp::R_ARM_PLT32: |
5344 | case elfcpp::R_ARM_CALL: | |
5345 | case elfcpp::R_ARM_JUMP24: | |
5346 | case elfcpp::R_ARM_PREL31: | |
fd3c5f0b ILT |
5347 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5348 | case elfcpp::R_ARM_MOVT_ABS: | |
5349 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5350 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
5351 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5352 | case elfcpp::R_ARM_MOVT_PREL: | |
5353 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5354 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
4a657b0d DK |
5355 | return 4; |
5356 | ||
5357 | case elfcpp::R_ARM_TARGET1: | |
5358 | // This should have been mapped to another type already. | |
5359 | // Fall through. | |
5360 | case elfcpp::R_ARM_COPY: | |
5361 | case elfcpp::R_ARM_GLOB_DAT: | |
5362 | case elfcpp::R_ARM_JUMP_SLOT: | |
5363 | case elfcpp::R_ARM_RELATIVE: | |
5364 | // These are relocations which should only be seen by the | |
5365 | // dynamic linker, and should never be seen here. | |
5366 | gold_error(_("%s: unexpected reloc %u in object file"), | |
5367 | object->name().c_str(), r_type); | |
5368 | return 0; | |
5369 | ||
5370 | default: | |
5371 | object->error(_("unsupported reloc %u in object file"), r_type); | |
5372 | return 0; | |
5373 | } | |
5374 | } | |
5375 | ||
5376 | // Scan the relocs during a relocatable link. | |
5377 | ||
5378 | template<bool big_endian> | |
5379 | void | |
5380 | Target_arm<big_endian>::scan_relocatable_relocs( | |
4a657b0d | 5381 | Symbol_table* symtab, |
2ea97941 | 5382 | Layout* layout, |
4a657b0d DK |
5383 | Sized_relobj<32, big_endian>* object, |
5384 | unsigned int data_shndx, | |
5385 | unsigned int sh_type, | |
5386 | const unsigned char* prelocs, | |
5387 | size_t reloc_count, | |
5388 | Output_section* output_section, | |
5389 | bool needs_special_offset_handling, | |
5390 | size_t local_symbol_count, | |
5391 | const unsigned char* plocal_symbols, | |
5392 | Relocatable_relocs* rr) | |
5393 | { | |
5394 | gold_assert(sh_type == elfcpp::SHT_REL); | |
5395 | ||
5396 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
5397 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
5398 | ||
5399 | gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL, | |
5400 | Scan_relocatable_relocs>( | |
4a657b0d | 5401 | symtab, |
2ea97941 | 5402 | layout, |
4a657b0d DK |
5403 | object, |
5404 | data_shndx, | |
5405 | prelocs, | |
5406 | reloc_count, | |
5407 | output_section, | |
5408 | needs_special_offset_handling, | |
5409 | local_symbol_count, | |
5410 | plocal_symbols, | |
5411 | rr); | |
5412 | } | |
5413 | ||
5414 | // Relocate a section during a relocatable link. | |
5415 | ||
5416 | template<bool big_endian> | |
5417 | void | |
5418 | Target_arm<big_endian>::relocate_for_relocatable( | |
5419 | const Relocate_info<32, big_endian>* relinfo, | |
5420 | unsigned int sh_type, | |
5421 | const unsigned char* prelocs, | |
5422 | size_t reloc_count, | |
5423 | Output_section* output_section, | |
5424 | off_t offset_in_output_section, | |
5425 | const Relocatable_relocs* rr, | |
5426 | unsigned char* view, | |
ebabffbd | 5427 | Arm_address view_address, |
4a657b0d DK |
5428 | section_size_type view_size, |
5429 | unsigned char* reloc_view, | |
5430 | section_size_type reloc_view_size) | |
5431 | { | |
5432 | gold_assert(sh_type == elfcpp::SHT_REL); | |
5433 | ||
5434 | gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>( | |
5435 | relinfo, | |
5436 | prelocs, | |
5437 | reloc_count, | |
5438 | output_section, | |
5439 | offset_in_output_section, | |
5440 | rr, | |
5441 | view, | |
5442 | view_address, | |
5443 | view_size, | |
5444 | reloc_view, | |
5445 | reloc_view_size); | |
5446 | } | |
5447 | ||
94cdfcff DK |
5448 | // Return the value to use for a dynamic symbol which requires special |
5449 | // treatment. This is how we support equality comparisons of function | |
5450 | // pointers across shared library boundaries, as described in the | |
5451 | // processor specific ABI supplement. | |
5452 | ||
4a657b0d DK |
5453 | template<bool big_endian> |
5454 | uint64_t | |
94cdfcff | 5455 | Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const |
4a657b0d | 5456 | { |
94cdfcff DK |
5457 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
5458 | return this->plt_section()->address() + gsym->plt_offset(); | |
4a657b0d DK |
5459 | } |
5460 | ||
5461 | // Map platform-specific relocs to real relocs | |
5462 | // | |
5463 | template<bool big_endian> | |
5464 | unsigned int | |
a6d1ef57 | 5465 | Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type) |
4a657b0d DK |
5466 | { |
5467 | switch (r_type) | |
5468 | { | |
5469 | case elfcpp::R_ARM_TARGET1: | |
a6d1ef57 DK |
5470 | // This is either R_ARM_ABS32 or R_ARM_REL32; |
5471 | return elfcpp::R_ARM_ABS32; | |
4a657b0d DK |
5472 | |
5473 | case elfcpp::R_ARM_TARGET2: | |
a6d1ef57 DK |
5474 | // This can be any reloc type but ususally is R_ARM_GOT_PREL |
5475 | return elfcpp::R_ARM_GOT_PREL; | |
4a657b0d DK |
5476 | |
5477 | default: | |
5478 | return r_type; | |
5479 | } | |
5480 | } | |
5481 | ||
d5b40221 DK |
5482 | // Whether if two EABI versions V1 and V2 are compatible. |
5483 | ||
5484 | template<bool big_endian> | |
5485 | bool | |
5486 | Target_arm<big_endian>::are_eabi_versions_compatible( | |
5487 | elfcpp::Elf_Word v1, | |
5488 | elfcpp::Elf_Word v2) | |
5489 | { | |
5490 | // v4 and v5 are the same spec before and after it was released, | |
5491 | // so allow mixing them. | |
5492 | if ((v1 == elfcpp::EF_ARM_EABI_VER4 && v2 == elfcpp::EF_ARM_EABI_VER5) | |
5493 | || (v1 == elfcpp::EF_ARM_EABI_VER5 && v2 == elfcpp::EF_ARM_EABI_VER4)) | |
5494 | return true; | |
5495 | ||
5496 | return v1 == v2; | |
5497 | } | |
5498 | ||
5499 | // Combine FLAGS from an input object called NAME and the processor-specific | |
5500 | // flags in the ELF header of the output. Much of this is adapted from the | |
5501 | // processor-specific flags merging code in elf32_arm_merge_private_bfd_data | |
5502 | // in bfd/elf32-arm.c. | |
5503 | ||
5504 | template<bool big_endian> | |
5505 | void | |
5506 | Target_arm<big_endian>::merge_processor_specific_flags( | |
5507 | const std::string& name, | |
5508 | elfcpp::Elf_Word flags) | |
5509 | { | |
5510 | if (this->are_processor_specific_flags_set()) | |
5511 | { | |
5512 | elfcpp::Elf_Word out_flags = this->processor_specific_flags(); | |
5513 | ||
5514 | // Nothing to merge if flags equal to those in output. | |
5515 | if (flags == out_flags) | |
5516 | return; | |
5517 | ||
5518 | // Complain about various flag mismatches. | |
5519 | elfcpp::Elf_Word version1 = elfcpp::arm_eabi_version(flags); | |
5520 | elfcpp::Elf_Word version2 = elfcpp::arm_eabi_version(out_flags); | |
5521 | if (!this->are_eabi_versions_compatible(version1, version2)) | |
5522 | gold_error(_("Source object %s has EABI version %d but output has " | |
5523 | "EABI version %d."), | |
5524 | name.c_str(), | |
5525 | (flags & elfcpp::EF_ARM_EABIMASK) >> 24, | |
5526 | (out_flags & elfcpp::EF_ARM_EABIMASK) >> 24); | |
5527 | } | |
5528 | else | |
5529 | { | |
5530 | // If the input is the default architecture and had the default | |
5531 | // flags then do not bother setting the flags for the output | |
5532 | // architecture, instead allow future merges to do this. If no | |
5533 | // future merges ever set these flags then they will retain their | |
5534 | // uninitialised values, which surprise surprise, correspond | |
5535 | // to the default values. | |
5536 | if (flags == 0) | |
5537 | return; | |
5538 | ||
5539 | // This is the first time, just copy the flags. | |
5540 | // We only copy the EABI version for now. | |
5541 | this->set_processor_specific_flags(flags & elfcpp::EF_ARM_EABIMASK); | |
5542 | } | |
5543 | } | |
5544 | ||
5545 | // Adjust ELF file header. | |
5546 | template<bool big_endian> | |
5547 | void | |
5548 | Target_arm<big_endian>::do_adjust_elf_header( | |
5549 | unsigned char* view, | |
5550 | int len) const | |
5551 | { | |
5552 | gold_assert(len == elfcpp::Elf_sizes<32>::ehdr_size); | |
5553 | ||
5554 | elfcpp::Ehdr<32, big_endian> ehdr(view); | |
5555 | unsigned char e_ident[elfcpp::EI_NIDENT]; | |
5556 | memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); | |
5557 | ||
5558 | if (elfcpp::arm_eabi_version(this->processor_specific_flags()) | |
5559 | == elfcpp::EF_ARM_EABI_UNKNOWN) | |
5560 | e_ident[elfcpp::EI_OSABI] = elfcpp::ELFOSABI_ARM; | |
5561 | else | |
5562 | e_ident[elfcpp::EI_OSABI] = 0; | |
5563 | e_ident[elfcpp::EI_ABIVERSION] = 0; | |
5564 | ||
5565 | // FIXME: Do EF_ARM_BE8 adjustment. | |
5566 | ||
5567 | elfcpp::Ehdr_write<32, big_endian> oehdr(view); | |
5568 | oehdr.put_e_ident(e_ident); | |
5569 | } | |
5570 | ||
5571 | // do_make_elf_object to override the same function in the base class. | |
5572 | // We need to use a target-specific sub-class of Sized_relobj<32, big_endian> | |
5573 | // to store ARM specific information. Hence we need to have our own | |
5574 | // ELF object creation. | |
5575 | ||
5576 | template<bool big_endian> | |
5577 | Object* | |
5578 | Target_arm<big_endian>::do_make_elf_object( | |
5579 | const std::string& name, | |
5580 | Input_file* input_file, | |
2ea97941 | 5581 | off_t offset, const elfcpp::Ehdr<32, big_endian>& ehdr) |
d5b40221 DK |
5582 | { |
5583 | int et = ehdr.get_e_type(); | |
5584 | if (et == elfcpp::ET_REL) | |
5585 | { | |
5586 | Arm_relobj<big_endian>* obj = | |
2ea97941 | 5587 | new Arm_relobj<big_endian>(name, input_file, offset, ehdr); |
d5b40221 DK |
5588 | obj->setup(); |
5589 | return obj; | |
5590 | } | |
5591 | else if (et == elfcpp::ET_DYN) | |
5592 | { | |
5593 | Sized_dynobj<32, big_endian>* obj = | |
2ea97941 | 5594 | new Arm_dynobj<big_endian>(name, input_file, offset, ehdr); |
d5b40221 DK |
5595 | obj->setup(); |
5596 | return obj; | |
5597 | } | |
5598 | else | |
5599 | { | |
5600 | gold_error(_("%s: unsupported ELF file type %d"), | |
5601 | name.c_str(), et); | |
5602 | return NULL; | |
5603 | } | |
5604 | } | |
5605 | ||
a0351a69 DK |
5606 | // Read the architecture from the Tag_also_compatible_with attribute, if any. |
5607 | // Returns -1 if no architecture could be read. | |
5608 | // This is adapted from get_secondary_compatible_arch() in bfd/elf32-arm.c. | |
5609 | ||
5610 | template<bool big_endian> | |
5611 | int | |
5612 | Target_arm<big_endian>::get_secondary_compatible_arch( | |
5613 | const Attributes_section_data* pasd) | |
5614 | { | |
5615 | const Object_attribute *known_attributes = | |
5616 | pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC); | |
5617 | ||
5618 | // Note: the tag and its argument below are uleb128 values, though | |
5619 | // currently-defined values fit in one byte for each. | |
5620 | const std::string& sv = | |
5621 | known_attributes[elfcpp::Tag_also_compatible_with].string_value(); | |
5622 | if (sv.size() == 2 | |
5623 | && sv.data()[0] == elfcpp::Tag_CPU_arch | |
5624 | && (sv.data()[1] & 128) != 128) | |
5625 | return sv.data()[1]; | |
5626 | ||
5627 | // This tag is "safely ignorable", so don't complain if it looks funny. | |
5628 | return -1; | |
5629 | } | |
5630 | ||
5631 | // Set, or unset, the architecture of the Tag_also_compatible_with attribute. | |
5632 | // The tag is removed if ARCH is -1. | |
5633 | // This is adapted from set_secondary_compatible_arch() in bfd/elf32-arm.c. | |
5634 | ||
5635 | template<bool big_endian> | |
5636 | void | |
5637 | Target_arm<big_endian>::set_secondary_compatible_arch( | |
5638 | Attributes_section_data* pasd, | |
5639 | int arch) | |
5640 | { | |
5641 | Object_attribute *known_attributes = | |
5642 | pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC); | |
5643 | ||
5644 | if (arch == -1) | |
5645 | { | |
5646 | known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(""); | |
5647 | return; | |
5648 | } | |
5649 | ||
5650 | // Note: the tag and its argument below are uleb128 values, though | |
5651 | // currently-defined values fit in one byte for each. | |
5652 | char sv[3]; | |
5653 | sv[0] = elfcpp::Tag_CPU_arch; | |
5654 | gold_assert(arch != 0); | |
5655 | sv[1] = arch; | |
5656 | sv[2] = '\0'; | |
5657 | ||
5658 | known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(sv); | |
5659 | } | |
5660 | ||
5661 | // Combine two values for Tag_CPU_arch, taking secondary compatibility tags | |
5662 | // into account. | |
5663 | // This is adapted from tag_cpu_arch_combine() in bfd/elf32-arm.c. | |
5664 | ||
5665 | template<bool big_endian> | |
5666 | int | |
5667 | Target_arm<big_endian>::tag_cpu_arch_combine( | |
5668 | const char* name, | |
5669 | int oldtag, | |
5670 | int* secondary_compat_out, | |
5671 | int newtag, | |
5672 | int secondary_compat) | |
5673 | { | |
5674 | #define T(X) elfcpp::TAG_CPU_ARCH_##X | |
5675 | static const int v6t2[] = | |
5676 | { | |
5677 | T(V6T2), // PRE_V4. | |
5678 | T(V6T2), // V4. | |
5679 | T(V6T2), // V4T. | |
5680 | T(V6T2), // V5T. | |
5681 | T(V6T2), // V5TE. | |
5682 | T(V6T2), // V5TEJ. | |
5683 | T(V6T2), // V6. | |
5684 | T(V7), // V6KZ. | |
5685 | T(V6T2) // V6T2. | |
5686 | }; | |
5687 | static const int v6k[] = | |
5688 | { | |
5689 | T(V6K), // PRE_V4. | |
5690 | T(V6K), // V4. | |
5691 | T(V6K), // V4T. | |
5692 | T(V6K), // V5T. | |
5693 | T(V6K), // V5TE. | |
5694 | T(V6K), // V5TEJ. | |
5695 | T(V6K), // V6. | |
5696 | T(V6KZ), // V6KZ. | |
5697 | T(V7), // V6T2. | |
5698 | T(V6K) // V6K. | |
5699 | }; | |
5700 | static const int v7[] = | |
5701 | { | |
5702 | T(V7), // PRE_V4. | |
5703 | T(V7), // V4. | |
5704 | T(V7), // V4T. | |
5705 | T(V7), // V5T. | |
5706 | T(V7), // V5TE. | |
5707 | T(V7), // V5TEJ. | |
5708 | T(V7), // V6. | |
5709 | T(V7), // V6KZ. | |
5710 | T(V7), // V6T2. | |
5711 | T(V7), // V6K. | |
5712 | T(V7) // V7. | |
5713 | }; | |
5714 | static const int v6_m[] = | |
5715 | { | |
5716 | -1, // PRE_V4. | |
5717 | -1, // V4. | |
5718 | T(V6K), // V4T. | |
5719 | T(V6K), // V5T. | |
5720 | T(V6K), // V5TE. | |
5721 | T(V6K), // V5TEJ. | |
5722 | T(V6K), // V6. | |
5723 | T(V6KZ), // V6KZ. | |
5724 | T(V7), // V6T2. | |
5725 | T(V6K), // V6K. | |
5726 | T(V7), // V7. | |
5727 | T(V6_M) // V6_M. | |
5728 | }; | |
5729 | static const int v6s_m[] = | |
5730 | { | |
5731 | -1, // PRE_V4. | |
5732 | -1, // V4. | |
5733 | T(V6K), // V4T. | |
5734 | T(V6K), // V5T. | |
5735 | T(V6K), // V5TE. | |
5736 | T(V6K), // V5TEJ. | |
5737 | T(V6K), // V6. | |
5738 | T(V6KZ), // V6KZ. | |
5739 | T(V7), // V6T2. | |
5740 | T(V6K), // V6K. | |
5741 | T(V7), // V7. | |
5742 | T(V6S_M), // V6_M. | |
5743 | T(V6S_M) // V6S_M. | |
5744 | }; | |
5745 | static const int v7e_m[] = | |
5746 | { | |
5747 | -1, // PRE_V4. | |
5748 | -1, // V4. | |
5749 | T(V7E_M), // V4T. | |
5750 | T(V7E_M), // V5T. | |
5751 | T(V7E_M), // V5TE. | |
5752 | T(V7E_M), // V5TEJ. | |
5753 | T(V7E_M), // V6. | |
5754 | T(V7E_M), // V6KZ. | |
5755 | T(V7E_M), // V6T2. | |
5756 | T(V7E_M), // V6K. | |
5757 | T(V7E_M), // V7. | |
5758 | T(V7E_M), // V6_M. | |
5759 | T(V7E_M), // V6S_M. | |
5760 | T(V7E_M) // V7E_M. | |
5761 | }; | |
5762 | static const int v4t_plus_v6_m[] = | |
5763 | { | |
5764 | -1, // PRE_V4. | |
5765 | -1, // V4. | |
5766 | T(V4T), // V4T. | |
5767 | T(V5T), // V5T. | |
5768 | T(V5TE), // V5TE. | |
5769 | T(V5TEJ), // V5TEJ. | |
5770 | T(V6), // V6. | |
5771 | T(V6KZ), // V6KZ. | |
5772 | T(V6T2), // V6T2. | |
5773 | T(V6K), // V6K. | |
5774 | T(V7), // V7. | |
5775 | T(V6_M), // V6_M. | |
5776 | T(V6S_M), // V6S_M. | |
5777 | T(V7E_M), // V7E_M. | |
5778 | T(V4T_PLUS_V6_M) // V4T plus V6_M. | |
5779 | }; | |
5780 | static const int *comb[] = | |
5781 | { | |
5782 | v6t2, | |
5783 | v6k, | |
5784 | v7, | |
5785 | v6_m, | |
5786 | v6s_m, | |
5787 | v7e_m, | |
5788 | // Pseudo-architecture. | |
5789 | v4t_plus_v6_m | |
5790 | }; | |
5791 | ||
5792 | // Check we've not got a higher architecture than we know about. | |
5793 | ||
5794 | if (oldtag >= elfcpp::MAX_TAG_CPU_ARCH || newtag >= elfcpp::MAX_TAG_CPU_ARCH) | |
5795 | { | |
5796 | gold_error(_("%s: unknown CPU architecture"), name); | |
5797 | return -1; | |
5798 | } | |
5799 | ||
5800 | // Override old tag if we have a Tag_also_compatible_with on the output. | |
5801 | ||
5802 | if ((oldtag == T(V6_M) && *secondary_compat_out == T(V4T)) | |
5803 | || (oldtag == T(V4T) && *secondary_compat_out == T(V6_M))) | |
5804 | oldtag = T(V4T_PLUS_V6_M); | |
5805 | ||
5806 | // And override the new tag if we have a Tag_also_compatible_with on the | |
5807 | // input. | |
5808 | ||
5809 | if ((newtag == T(V6_M) && secondary_compat == T(V4T)) | |
5810 | || (newtag == T(V4T) && secondary_compat == T(V6_M))) | |
5811 | newtag = T(V4T_PLUS_V6_M); | |
5812 | ||
5813 | // Architectures before V6KZ add features monotonically. | |
5814 | int tagh = std::max(oldtag, newtag); | |
5815 | if (tagh <= elfcpp::TAG_CPU_ARCH_V6KZ) | |
5816 | return tagh; | |
5817 | ||
5818 | int tagl = std::min(oldtag, newtag); | |
5819 | int result = comb[tagh - T(V6T2)][tagl]; | |
5820 | ||
5821 | // Use Tag_CPU_arch == V4T and Tag_also_compatible_with (Tag_CPU_arch V6_M) | |
5822 | // as the canonical version. | |
5823 | if (result == T(V4T_PLUS_V6_M)) | |
5824 | { | |
5825 | result = T(V4T); | |
5826 | *secondary_compat_out = T(V6_M); | |
5827 | } | |
5828 | else | |
5829 | *secondary_compat_out = -1; | |
5830 | ||
5831 | if (result == -1) | |
5832 | { | |
5833 | gold_error(_("%s: conflicting CPU architectures %d/%d"), | |
5834 | name, oldtag, newtag); | |
5835 | return -1; | |
5836 | } | |
5837 | ||
5838 | return result; | |
5839 | #undef T | |
5840 | } | |
5841 | ||
5842 | // Helper to print AEABI enum tag value. | |
5843 | ||
5844 | template<bool big_endian> | |
5845 | std::string | |
5846 | Target_arm<big_endian>::aeabi_enum_name(unsigned int value) | |
5847 | { | |
5848 | static const char *aeabi_enum_names[] = | |
5849 | { "", "variable-size", "32-bit", "" }; | |
5850 | const size_t aeabi_enum_names_size = | |
5851 | sizeof(aeabi_enum_names) / sizeof(aeabi_enum_names[0]); | |
5852 | ||
5853 | if (value < aeabi_enum_names_size) | |
5854 | return std::string(aeabi_enum_names[value]); | |
5855 | else | |
5856 | { | |
5857 | char buffer[100]; | |
5858 | sprintf(buffer, "<unknown value %u>", value); | |
5859 | return std::string(buffer); | |
5860 | } | |
5861 | } | |
5862 | ||
5863 | // Return the string value to store in TAG_CPU_name. | |
5864 | ||
5865 | template<bool big_endian> | |
5866 | std::string | |
5867 | Target_arm<big_endian>::tag_cpu_name_value(unsigned int value) | |
5868 | { | |
5869 | static const char *name_table[] = { | |
5870 | // These aren't real CPU names, but we can't guess | |
5871 | // that from the architecture version alone. | |
5872 | "Pre v4", | |
5873 | "ARM v4", | |
5874 | "ARM v4T", | |
5875 | "ARM v5T", | |
5876 | "ARM v5TE", | |
5877 | "ARM v5TEJ", | |
5878 | "ARM v6", | |
5879 | "ARM v6KZ", | |
5880 | "ARM v6T2", | |
5881 | "ARM v6K", | |
5882 | "ARM v7", | |
5883 | "ARM v6-M", | |
5884 | "ARM v6S-M", | |
5885 | "ARM v7E-M" | |
5886 | }; | |
5887 | const size_t name_table_size = sizeof(name_table) / sizeof(name_table[0]); | |
5888 | ||
5889 | if (value < name_table_size) | |
5890 | return std::string(name_table[value]); | |
5891 | else | |
5892 | { | |
5893 | char buffer[100]; | |
5894 | sprintf(buffer, "<unknown CPU value %u>", value); | |
5895 | return std::string(buffer); | |
5896 | } | |
5897 | } | |
5898 | ||
5899 | // Merge object attributes from input file called NAME with those of the | |
5900 | // output. The input object attributes are in the object pointed by PASD. | |
5901 | ||
5902 | template<bool big_endian> | |
5903 | void | |
5904 | Target_arm<big_endian>::merge_object_attributes( | |
5905 | const char* name, | |
5906 | const Attributes_section_data* pasd) | |
5907 | { | |
5908 | // Return if there is no attributes section data. | |
5909 | if (pasd == NULL) | |
5910 | return; | |
5911 | ||
5912 | // If output has no object attributes, just copy. | |
5913 | if (this->attributes_section_data_ == NULL) | |
5914 | { | |
5915 | this->attributes_section_data_ = new Attributes_section_data(*pasd); | |
5916 | return; | |
5917 | } | |
5918 | ||
5919 | const int vendor = Object_attribute::OBJ_ATTR_PROC; | |
5920 | const Object_attribute* in_attr = pasd->known_attributes(vendor); | |
5921 | Object_attribute* out_attr = | |
5922 | this->attributes_section_data_->known_attributes(vendor); | |
5923 | ||
5924 | // This needs to happen before Tag_ABI_FP_number_model is merged. */ | |
5925 | if (in_attr[elfcpp::Tag_ABI_VFP_args].int_value() | |
5926 | != out_attr[elfcpp::Tag_ABI_VFP_args].int_value()) | |
5927 | { | |
5928 | // Ignore mismatches if the object doesn't use floating point. */ | |
5929 | if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0) | |
5930 | out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value( | |
5931 | in_attr[elfcpp::Tag_ABI_VFP_args].int_value()); | |
5932 | else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0) | |
5933 | gold_error(_("%s uses VFP register arguments, output does not"), | |
5934 | name); | |
5935 | } | |
5936 | ||
5937 | for (int i = 4; i < Vendor_object_attributes::NUM_KNOWN_ATTRIBUTES; ++i) | |
5938 | { | |
5939 | // Merge this attribute with existing attributes. | |
5940 | switch (i) | |
5941 | { | |
5942 | case elfcpp::Tag_CPU_raw_name: | |
5943 | case elfcpp::Tag_CPU_name: | |
5944 | // These are merged after Tag_CPU_arch. | |
5945 | break; | |
5946 | ||
5947 | case elfcpp::Tag_ABI_optimization_goals: | |
5948 | case elfcpp::Tag_ABI_FP_optimization_goals: | |
5949 | // Use the first value seen. | |
5950 | break; | |
5951 | ||
5952 | case elfcpp::Tag_CPU_arch: | |
5953 | { | |
5954 | unsigned int saved_out_attr = out_attr->int_value(); | |
5955 | // Merge Tag_CPU_arch and Tag_also_compatible_with. | |
5956 | int secondary_compat = | |
5957 | this->get_secondary_compatible_arch(pasd); | |
5958 | int secondary_compat_out = | |
5959 | this->get_secondary_compatible_arch( | |
5960 | this->attributes_section_data_); | |
5961 | out_attr[i].set_int_value( | |
5962 | tag_cpu_arch_combine(name, out_attr[i].int_value(), | |
5963 | &secondary_compat_out, | |
5964 | in_attr[i].int_value(), | |
5965 | secondary_compat)); | |
5966 | this->set_secondary_compatible_arch(this->attributes_section_data_, | |
5967 | secondary_compat_out); | |
5968 | ||
5969 | // Merge Tag_CPU_name and Tag_CPU_raw_name. | |
5970 | if (out_attr[i].int_value() == saved_out_attr) | |
5971 | ; // Leave the names alone. | |
5972 | else if (out_attr[i].int_value() == in_attr[i].int_value()) | |
5973 | { | |
5974 | // The output architecture has been changed to match the | |
5975 | // input architecture. Use the input names. | |
5976 | out_attr[elfcpp::Tag_CPU_name].set_string_value( | |
5977 | in_attr[elfcpp::Tag_CPU_name].string_value()); | |
5978 | out_attr[elfcpp::Tag_CPU_raw_name].set_string_value( | |
5979 | in_attr[elfcpp::Tag_CPU_raw_name].string_value()); | |
5980 | } | |
5981 | else | |
5982 | { | |
5983 | out_attr[elfcpp::Tag_CPU_name].set_string_value(""); | |
5984 | out_attr[elfcpp::Tag_CPU_raw_name].set_string_value(""); | |
5985 | } | |
5986 | ||
5987 | // If we still don't have a value for Tag_CPU_name, | |
5988 | // make one up now. Tag_CPU_raw_name remains blank. | |
5989 | if (out_attr[elfcpp::Tag_CPU_name].string_value() == "") | |
5990 | { | |
5991 | const std::string cpu_name = | |
5992 | this->tag_cpu_name_value(out_attr[i].int_value()); | |
5993 | // FIXME: If we see an unknown CPU, this will be set | |
5994 | // to "<unknown CPU n>", where n is the attribute value. | |
5995 | // This is different from BFD, which leaves the name alone. | |
5996 | out_attr[elfcpp::Tag_CPU_name].set_string_value(cpu_name); | |
5997 | } | |
5998 | } | |
5999 | break; | |
6000 | ||
6001 | case elfcpp::Tag_ARM_ISA_use: | |
6002 | case elfcpp::Tag_THUMB_ISA_use: | |
6003 | case elfcpp::Tag_WMMX_arch: | |
6004 | case elfcpp::Tag_Advanced_SIMD_arch: | |
6005 | // ??? Do Advanced_SIMD (NEON) and WMMX conflict? | |
6006 | case elfcpp::Tag_ABI_FP_rounding: | |
6007 | case elfcpp::Tag_ABI_FP_exceptions: | |
6008 | case elfcpp::Tag_ABI_FP_user_exceptions: | |
6009 | case elfcpp::Tag_ABI_FP_number_model: | |
6010 | case elfcpp::Tag_VFP_HP_extension: | |
6011 | case elfcpp::Tag_CPU_unaligned_access: | |
6012 | case elfcpp::Tag_T2EE_use: | |
6013 | case elfcpp::Tag_Virtualization_use: | |
6014 | case elfcpp::Tag_MPextension_use: | |
6015 | // Use the largest value specified. | |
6016 | if (in_attr[i].int_value() > out_attr[i].int_value()) | |
6017 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6018 | break; | |
6019 | ||
6020 | case elfcpp::Tag_ABI_align8_preserved: | |
6021 | case elfcpp::Tag_ABI_PCS_RO_data: | |
6022 | // Use the smallest value specified. | |
6023 | if (in_attr[i].int_value() < out_attr[i].int_value()) | |
6024 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6025 | break; | |
6026 | ||
6027 | case elfcpp::Tag_ABI_align8_needed: | |
6028 | if ((in_attr[i].int_value() > 0 || out_attr[i].int_value() > 0) | |
6029 | && (in_attr[elfcpp::Tag_ABI_align8_preserved].int_value() == 0 | |
6030 | || (out_attr[elfcpp::Tag_ABI_align8_preserved].int_value() | |
6031 | == 0))) | |
6032 | { | |
6033 | // This error message should be enabled once all non-conformant | |
6034 | // binaries in the toolchain have had the attributes set | |
6035 | // properly. | |
6036 | // gold_error(_("output 8-byte data alignment conflicts with %s"), | |
6037 | // name); | |
6038 | } | |
6039 | // Fall through. | |
6040 | case elfcpp::Tag_ABI_FP_denormal: | |
6041 | case elfcpp::Tag_ABI_PCS_GOT_use: | |
6042 | { | |
6043 | // These tags have 0 = don't care, 1 = strong requirement, | |
6044 | // 2 = weak requirement. | |
6045 | static const int order_021[3] = {0, 2, 1}; | |
6046 | ||
6047 | // Use the "greatest" from the sequence 0, 2, 1, or the largest | |
6048 | // value if greater than 2 (for future-proofing). | |
6049 | if ((in_attr[i].int_value() > 2 | |
6050 | && in_attr[i].int_value() > out_attr[i].int_value()) | |
6051 | || (in_attr[i].int_value() <= 2 | |
6052 | && out_attr[i].int_value() <= 2 | |
6053 | && (order_021[in_attr[i].int_value()] | |
6054 | > order_021[out_attr[i].int_value()]))) | |
6055 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6056 | } | |
6057 | break; | |
6058 | ||
6059 | case elfcpp::Tag_CPU_arch_profile: | |
6060 | if (out_attr[i].int_value() != in_attr[i].int_value()) | |
6061 | { | |
6062 | // 0 will merge with anything. | |
6063 | // 'A' and 'S' merge to 'A'. | |
6064 | // 'R' and 'S' merge to 'R'. | |
6065 | // 'M' and 'A|R|S' is an error. | |
6066 | if (out_attr[i].int_value() == 0 | |
6067 | || (out_attr[i].int_value() == 'S' | |
6068 | && (in_attr[i].int_value() == 'A' | |
6069 | || in_attr[i].int_value() == 'R'))) | |
6070 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6071 | else if (in_attr[i].int_value() == 0 | |
6072 | || (in_attr[i].int_value() == 'S' | |
6073 | && (out_attr[i].int_value() == 'A' | |
6074 | || out_attr[i].int_value() == 'R'))) | |
6075 | ; // Do nothing. | |
6076 | else | |
6077 | { | |
6078 | gold_error | |
6079 | (_("conflicting architecture profiles %c/%c"), | |
6080 | in_attr[i].int_value() ? in_attr[i].int_value() : '0', | |
6081 | out_attr[i].int_value() ? out_attr[i].int_value() : '0'); | |
6082 | } | |
6083 | } | |
6084 | break; | |
6085 | case elfcpp::Tag_VFP_arch: | |
6086 | { | |
6087 | static const struct | |
6088 | { | |
6089 | int ver; | |
6090 | int regs; | |
6091 | } vfp_versions[7] = | |
6092 | { | |
6093 | {0, 0}, | |
6094 | {1, 16}, | |
6095 | {2, 16}, | |
6096 | {3, 32}, | |
6097 | {3, 16}, | |
6098 | {4, 32}, | |
6099 | {4, 16} | |
6100 | }; | |
6101 | ||
6102 | // Values greater than 6 aren't defined, so just pick the | |
6103 | // biggest. | |
6104 | if (in_attr[i].int_value() > 6 | |
6105 | && in_attr[i].int_value() > out_attr[i].int_value()) | |
6106 | { | |
6107 | *out_attr = *in_attr; | |
6108 | break; | |
6109 | } | |
6110 | // The output uses the superset of input features | |
6111 | // (ISA version) and registers. | |
6112 | int ver = std::max(vfp_versions[in_attr[i].int_value()].ver, | |
6113 | vfp_versions[out_attr[i].int_value()].ver); | |
6114 | int regs = std::max(vfp_versions[in_attr[i].int_value()].regs, | |
6115 | vfp_versions[out_attr[i].int_value()].regs); | |
6116 | // This assumes all possible supersets are also a valid | |
6117 | // options. | |
6118 | int newval; | |
6119 | for (newval = 6; newval > 0; newval--) | |
6120 | { | |
6121 | if (regs == vfp_versions[newval].regs | |
6122 | && ver == vfp_versions[newval].ver) | |
6123 | break; | |
6124 | } | |
6125 | out_attr[i].set_int_value(newval); | |
6126 | } | |
6127 | break; | |
6128 | case elfcpp::Tag_PCS_config: | |
6129 | if (out_attr[i].int_value() == 0) | |
6130 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6131 | else if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) | |
6132 | { | |
6133 | // It's sometimes ok to mix different configs, so this is only | |
6134 | // a warning. | |
6135 | gold_warning(_("%s: conflicting platform configuration"), name); | |
6136 | } | |
6137 | break; | |
6138 | case elfcpp::Tag_ABI_PCS_R9_use: | |
6139 | if (in_attr[i].int_value() != out_attr[i].int_value() | |
6140 | && out_attr[i].int_value() != elfcpp::AEABI_R9_unused | |
6141 | && in_attr[i].int_value() != elfcpp::AEABI_R9_unused) | |
6142 | { | |
6143 | gold_error(_("%s: conflicting use of R9"), name); | |
6144 | } | |
6145 | if (out_attr[i].int_value() == elfcpp::AEABI_R9_unused) | |
6146 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6147 | break; | |
6148 | case elfcpp::Tag_ABI_PCS_RW_data: | |
6149 | if (in_attr[i].int_value() == elfcpp::AEABI_PCS_RW_data_SBrel | |
6150 | && (in_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() | |
6151 | != elfcpp::AEABI_R9_SB) | |
6152 | && (out_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() | |
6153 | != elfcpp::AEABI_R9_unused)) | |
6154 | { | |
6155 | gold_error(_("%s: SB relative addressing conflicts with use " | |
6156 | "of R9"), | |
6157 | name); | |
6158 | } | |
6159 | // Use the smallest value specified. | |
6160 | if (in_attr[i].int_value() < out_attr[i].int_value()) | |
6161 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6162 | break; | |
6163 | case elfcpp::Tag_ABI_PCS_wchar_t: | |
6164 | // FIXME: Make it possible to turn off this warning. | |
6165 | if (out_attr[i].int_value() | |
6166 | && in_attr[i].int_value() | |
6167 | && out_attr[i].int_value() != in_attr[i].int_value()) | |
6168 | { | |
6169 | gold_warning(_("%s uses %u-byte wchar_t yet the output is to " | |
6170 | "use %u-byte wchar_t; use of wchar_t values " | |
6171 | "across objects may fail"), | |
6172 | name, in_attr[i].int_value(), | |
6173 | out_attr[i].int_value()); | |
6174 | } | |
6175 | else if (in_attr[i].int_value() && !out_attr[i].int_value()) | |
6176 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6177 | break; | |
6178 | case elfcpp::Tag_ABI_enum_size: | |
6179 | if (in_attr[i].int_value() != elfcpp::AEABI_enum_unused) | |
6180 | { | |
6181 | if (out_attr[i].int_value() == elfcpp::AEABI_enum_unused | |
6182 | || out_attr[i].int_value() == elfcpp::AEABI_enum_forced_wide) | |
6183 | { | |
6184 | // The existing object is compatible with anything. | |
6185 | // Use whatever requirements the new object has. | |
6186 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6187 | } | |
6188 | // FIXME: Make it possible to turn off this warning. | |
6189 | else if (in_attr[i].int_value() != elfcpp::AEABI_enum_forced_wide | |
6190 | && out_attr[i].int_value() != in_attr[i].int_value()) | |
6191 | { | |
6192 | unsigned int in_value = in_attr[i].int_value(); | |
6193 | unsigned int out_value = out_attr[i].int_value(); | |
6194 | gold_warning(_("%s uses %s enums yet the output is to use " | |
6195 | "%s enums; use of enum values across objects " | |
6196 | "may fail"), | |
6197 | name, | |
6198 | this->aeabi_enum_name(in_value).c_str(), | |
6199 | this->aeabi_enum_name(out_value).c_str()); | |
6200 | } | |
6201 | } | |
6202 | break; | |
6203 | case elfcpp::Tag_ABI_VFP_args: | |
6204 | // Aready done. | |
6205 | break; | |
6206 | case elfcpp::Tag_ABI_WMMX_args: | |
6207 | if (in_attr[i].int_value() != out_attr[i].int_value()) | |
6208 | { | |
6209 | gold_error(_("%s uses iWMMXt register arguments, output does " | |
6210 | "not"), | |
6211 | name); | |
6212 | } | |
6213 | break; | |
6214 | case Object_attribute::Tag_compatibility: | |
6215 | // Merged in target-independent code. | |
6216 | break; | |
6217 | case elfcpp::Tag_ABI_HardFP_use: | |
6218 | // 1 (SP) and 2 (DP) conflict, so combine to 3 (SP & DP). | |
6219 | if ((in_attr[i].int_value() == 1 && out_attr[i].int_value() == 2) | |
6220 | || (in_attr[i].int_value() == 2 && out_attr[i].int_value() == 1)) | |
6221 | out_attr[i].set_int_value(3); | |
6222 | else if (in_attr[i].int_value() > out_attr[i].int_value()) | |
6223 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6224 | break; | |
6225 | case elfcpp::Tag_ABI_FP_16bit_format: | |
6226 | if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) | |
6227 | { | |
6228 | if (in_attr[i].int_value() != out_attr[i].int_value()) | |
6229 | gold_error(_("fp16 format mismatch between %s and output"), | |
6230 | name); | |
6231 | } | |
6232 | if (in_attr[i].int_value() != 0) | |
6233 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6234 | break; | |
6235 | ||
6236 | case elfcpp::Tag_nodefaults: | |
6237 | // This tag is set if it exists, but the value is unused (and is | |
6238 | // typically zero). We don't actually need to do anything here - | |
6239 | // the merge happens automatically when the type flags are merged | |
6240 | // below. | |
6241 | break; | |
6242 | case elfcpp::Tag_also_compatible_with: | |
6243 | // Already done in Tag_CPU_arch. | |
6244 | break; | |
6245 | case elfcpp::Tag_conformance: | |
6246 | // Keep the attribute if it matches. Throw it away otherwise. | |
6247 | // No attribute means no claim to conform. | |
6248 | if (in_attr[i].string_value() != out_attr[i].string_value()) | |
6249 | out_attr[i].set_string_value(""); | |
6250 | break; | |
6251 | ||
6252 | default: | |
6253 | { | |
6254 | const char* err_object = NULL; | |
6255 | ||
6256 | // The "known_obj_attributes" table does contain some undefined | |
6257 | // attributes. Ensure that there are unused. | |
6258 | if (out_attr[i].int_value() != 0 | |
6259 | || out_attr[i].string_value() != "") | |
6260 | err_object = "output"; | |
6261 | else if (in_attr[i].int_value() != 0 | |
6262 | || in_attr[i].string_value() != "") | |
6263 | err_object = name; | |
6264 | ||
6265 | if (err_object != NULL) | |
6266 | { | |
6267 | // Attribute numbers >=64 (mod 128) can be safely ignored. | |
6268 | if ((i & 127) < 64) | |
6269 | gold_error(_("%s: unknown mandatory EABI object attribute " | |
6270 | "%d"), | |
6271 | err_object, i); | |
6272 | else | |
6273 | gold_warning(_("%s: unknown EABI object attribute %d"), | |
6274 | err_object, i); | |
6275 | } | |
6276 | ||
6277 | // Only pass on attributes that match in both inputs. | |
6278 | if (!in_attr[i].matches(out_attr[i])) | |
6279 | { | |
6280 | out_attr[i].set_int_value(0); | |
6281 | out_attr[i].set_string_value(""); | |
6282 | } | |
6283 | } | |
6284 | } | |
6285 | ||
6286 | // If out_attr was copied from in_attr then it won't have a type yet. | |
6287 | if (in_attr[i].type() && !out_attr[i].type()) | |
6288 | out_attr[i].set_type(in_attr[i].type()); | |
6289 | } | |
6290 | ||
6291 | // Merge Tag_compatibility attributes and any common GNU ones. | |
6292 | this->attributes_section_data_->merge(name, pasd); | |
6293 | ||
6294 | // Check for any attributes not known on ARM. | |
6295 | typedef Vendor_object_attributes::Other_attributes Other_attributes; | |
6296 | const Other_attributes* in_other_attributes = pasd->other_attributes(vendor); | |
6297 | Other_attributes::const_iterator in_iter = in_other_attributes->begin(); | |
6298 | Other_attributes* out_other_attributes = | |
6299 | this->attributes_section_data_->other_attributes(vendor); | |
6300 | Other_attributes::iterator out_iter = out_other_attributes->begin(); | |
6301 | ||
6302 | while (in_iter != in_other_attributes->end() | |
6303 | || out_iter != out_other_attributes->end()) | |
6304 | { | |
6305 | const char* err_object = NULL; | |
6306 | int err_tag = 0; | |
6307 | ||
6308 | // The tags for each list are in numerical order. | |
6309 | // If the tags are equal, then merge. | |
6310 | if (out_iter != out_other_attributes->end() | |
6311 | && (in_iter == in_other_attributes->end() | |
6312 | || in_iter->first > out_iter->first)) | |
6313 | { | |
6314 | // This attribute only exists in output. We can't merge, and we | |
6315 | // don't know what the tag means, so delete it. | |
6316 | err_object = "output"; | |
6317 | err_tag = out_iter->first; | |
6318 | int saved_tag = out_iter->first; | |
6319 | delete out_iter->second; | |
6320 | out_other_attributes->erase(out_iter); | |
6321 | out_iter = out_other_attributes->upper_bound(saved_tag); | |
6322 | } | |
6323 | else if (in_iter != in_other_attributes->end() | |
6324 | && (out_iter != out_other_attributes->end() | |
6325 | || in_iter->first < out_iter->first)) | |
6326 | { | |
6327 | // This attribute only exists in input. We can't merge, and we | |
6328 | // don't know what the tag means, so ignore it. | |
6329 | err_object = name; | |
6330 | err_tag = in_iter->first; | |
6331 | ++in_iter; | |
6332 | } | |
6333 | else // The tags are equal. | |
6334 | { | |
6335 | // As present, all attributes in the list are unknown, and | |
6336 | // therefore can't be merged meaningfully. | |
6337 | err_object = "output"; | |
6338 | err_tag = out_iter->first; | |
6339 | ||
6340 | // Only pass on attributes that match in both inputs. | |
6341 | if (!in_iter->second->matches(*(out_iter->second))) | |
6342 | { | |
6343 | // No match. Delete the attribute. | |
6344 | int saved_tag = out_iter->first; | |
6345 | delete out_iter->second; | |
6346 | out_other_attributes->erase(out_iter); | |
6347 | out_iter = out_other_attributes->upper_bound(saved_tag); | |
6348 | } | |
6349 | else | |
6350 | { | |
6351 | // Matched. Keep the attribute and move to the next. | |
6352 | ++out_iter; | |
6353 | ++in_iter; | |
6354 | } | |
6355 | } | |
6356 | ||
6357 | if (err_object) | |
6358 | { | |
6359 | // Attribute numbers >=64 (mod 128) can be safely ignored. */ | |
6360 | if ((err_tag & 127) < 64) | |
6361 | { | |
6362 | gold_error(_("%s: unknown mandatory EABI object attribute %d"), | |
6363 | err_object, err_tag); | |
6364 | } | |
6365 | else | |
6366 | { | |
6367 | gold_warning(_("%s: unknown EABI object attribute %d"), | |
6368 | err_object, err_tag); | |
6369 | } | |
6370 | } | |
6371 | } | |
6372 | } | |
6373 | ||
55da9579 DK |
6374 | // Return whether a relocation type used the LSB to distinguish THUMB |
6375 | // addresses. | |
6376 | template<bool big_endian> | |
6377 | bool | |
6378 | Target_arm<big_endian>::reloc_uses_thumb_bit(unsigned int r_type) | |
6379 | { | |
6380 | switch (r_type) | |
6381 | { | |
6382 | case elfcpp::R_ARM_PC24: | |
6383 | case elfcpp::R_ARM_ABS32: | |
6384 | case elfcpp::R_ARM_REL32: | |
6385 | case elfcpp::R_ARM_SBREL32: | |
6386 | case elfcpp::R_ARM_THM_CALL: | |
6387 | case elfcpp::R_ARM_GLOB_DAT: | |
6388 | case elfcpp::R_ARM_JUMP_SLOT: | |
6389 | case elfcpp::R_ARM_GOTOFF32: | |
6390 | case elfcpp::R_ARM_PLT32: | |
6391 | case elfcpp::R_ARM_CALL: | |
6392 | case elfcpp::R_ARM_JUMP24: | |
6393 | case elfcpp::R_ARM_THM_JUMP24: | |
6394 | case elfcpp::R_ARM_SBREL31: | |
6395 | case elfcpp::R_ARM_PREL31: | |
6396 | case elfcpp::R_ARM_MOVW_ABS_NC: | |
6397 | case elfcpp::R_ARM_MOVW_PREL_NC: | |
6398 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
6399 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
6400 | case elfcpp::R_ARM_THM_JUMP19: | |
6401 | case elfcpp::R_ARM_THM_ALU_PREL_11_0: | |
6402 | case elfcpp::R_ARM_ALU_PC_G0_NC: | |
6403 | case elfcpp::R_ARM_ALU_PC_G0: | |
6404 | case elfcpp::R_ARM_ALU_PC_G1_NC: | |
6405 | case elfcpp::R_ARM_ALU_PC_G1: | |
6406 | case elfcpp::R_ARM_ALU_PC_G2: | |
6407 | case elfcpp::R_ARM_ALU_SB_G0_NC: | |
6408 | case elfcpp::R_ARM_ALU_SB_G0: | |
6409 | case elfcpp::R_ARM_ALU_SB_G1_NC: | |
6410 | case elfcpp::R_ARM_ALU_SB_G1: | |
6411 | case elfcpp::R_ARM_ALU_SB_G2: | |
6412 | case elfcpp::R_ARM_MOVW_BREL_NC: | |
6413 | case elfcpp::R_ARM_MOVW_BREL: | |
6414 | case elfcpp::R_ARM_THM_MOVW_BREL_NC: | |
6415 | case elfcpp::R_ARM_THM_MOVW_BREL: | |
6416 | return true; | |
6417 | default: | |
6418 | return false; | |
6419 | } | |
6420 | } | |
6421 | ||
6422 | // Stub-generation methods for Target_arm. | |
6423 | ||
6424 | // Make a new Arm_input_section object. | |
6425 | ||
6426 | template<bool big_endian> | |
6427 | Arm_input_section<big_endian>* | |
6428 | Target_arm<big_endian>::new_arm_input_section( | |
2ea97941 ILT |
6429 | Relobj* relobj, |
6430 | unsigned int shndx) | |
55da9579 | 6431 | { |
2ea97941 | 6432 | Input_section_specifier iss(relobj, shndx); |
55da9579 DK |
6433 | |
6434 | Arm_input_section<big_endian>* arm_input_section = | |
2ea97941 | 6435 | new Arm_input_section<big_endian>(relobj, shndx); |
55da9579 DK |
6436 | arm_input_section->init(); |
6437 | ||
6438 | // Register new Arm_input_section in map for look-up. | |
6439 | std::pair<typename Arm_input_section_map::iterator, bool> ins = | |
6440 | this->arm_input_section_map_.insert(std::make_pair(iss, arm_input_section)); | |
6441 | ||
6442 | // Make sure that it we have not created another Arm_input_section | |
6443 | // for this input section already. | |
6444 | gold_assert(ins.second); | |
6445 | ||
6446 | return arm_input_section; | |
6447 | } | |
6448 | ||
6449 | // Find the Arm_input_section object corresponding to the SHNDX-th input | |
6450 | // section of RELOBJ. | |
6451 | ||
6452 | template<bool big_endian> | |
6453 | Arm_input_section<big_endian>* | |
6454 | Target_arm<big_endian>::find_arm_input_section( | |
2ea97941 ILT |
6455 | Relobj* relobj, |
6456 | unsigned int shndx) const | |
55da9579 | 6457 | { |
2ea97941 | 6458 | Input_section_specifier iss(relobj, shndx); |
55da9579 DK |
6459 | typename Arm_input_section_map::const_iterator p = |
6460 | this->arm_input_section_map_.find(iss); | |
6461 | return (p != this->arm_input_section_map_.end()) ? p->second : NULL; | |
6462 | } | |
6463 | ||
6464 | // Make a new stub table. | |
6465 | ||
6466 | template<bool big_endian> | |
6467 | Stub_table<big_endian>* | |
6468 | Target_arm<big_endian>::new_stub_table(Arm_input_section<big_endian>* owner) | |
6469 | { | |
2ea97941 | 6470 | Stub_table<big_endian>* stub_table = |
55da9579 | 6471 | new Stub_table<big_endian>(owner); |
2ea97941 | 6472 | this->stub_tables_.push_back(stub_table); |
55da9579 | 6473 | |
2ea97941 ILT |
6474 | stub_table->set_address(owner->address() + owner->data_size()); |
6475 | stub_table->set_file_offset(owner->offset() + owner->data_size()); | |
6476 | stub_table->finalize_data_size(); | |
55da9579 | 6477 | |
2ea97941 | 6478 | return stub_table; |
55da9579 DK |
6479 | } |
6480 | ||
eb44217c DK |
6481 | // Scan a relocation for stub generation. |
6482 | ||
6483 | template<bool big_endian> | |
6484 | void | |
6485 | Target_arm<big_endian>::scan_reloc_for_stub( | |
6486 | const Relocate_info<32, big_endian>* relinfo, | |
6487 | unsigned int r_type, | |
6488 | const Sized_symbol<32>* gsym, | |
6489 | unsigned int r_sym, | |
6490 | const Symbol_value<32>* psymval, | |
6491 | elfcpp::Elf_types<32>::Elf_Swxword addend, | |
6492 | Arm_address address) | |
6493 | { | |
2ea97941 | 6494 | typedef typename Target_arm<big_endian>::Relocate Relocate; |
eb44217c DK |
6495 | |
6496 | const Arm_relobj<big_endian>* arm_relobj = | |
6497 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
6498 | ||
6499 | bool target_is_thumb; | |
6500 | Symbol_value<32> symval; | |
6501 | if (gsym != NULL) | |
6502 | { | |
6503 | // This is a global symbol. Determine if we use PLT and if the | |
6504 | // final target is THUMB. | |
2ea97941 | 6505 | if (gsym->use_plt_offset(Relocate::reloc_is_non_pic(r_type))) |
eb44217c DK |
6506 | { |
6507 | // This uses a PLT, change the symbol value. | |
6508 | symval.set_output_value(this->plt_section()->address() | |
6509 | + gsym->plt_offset()); | |
6510 | psymval = &symval; | |
6511 | target_is_thumb = false; | |
6512 | } | |
6513 | else if (gsym->is_undefined()) | |
6514 | // There is no need to generate a stub symbol is undefined. | |
6515 | return; | |
6516 | else | |
6517 | { | |
6518 | target_is_thumb = | |
6519 | ((gsym->type() == elfcpp::STT_ARM_TFUNC) | |
6520 | || (gsym->type() == elfcpp::STT_FUNC | |
6521 | && !gsym->is_undefined() | |
6522 | && ((psymval->value(arm_relobj, 0) & 1) != 0))); | |
6523 | } | |
6524 | } | |
6525 | else | |
6526 | { | |
6527 | // This is a local symbol. Determine if the final target is THUMB. | |
6528 | target_is_thumb = arm_relobj->local_symbol_is_thumb_function(r_sym); | |
6529 | } | |
6530 | ||
6531 | // Strip LSB if this points to a THUMB target. | |
6532 | if (target_is_thumb | |
6533 | && Target_arm<big_endian>::reloc_uses_thumb_bit(r_type) | |
6534 | && ((psymval->value(arm_relobj, 0) & 1) != 0)) | |
6535 | { | |
6536 | Arm_address stripped_value = | |
6537 | psymval->value(arm_relobj, 0) & ~static_cast<Arm_address>(1); | |
6538 | symval.set_output_value(stripped_value); | |
6539 | psymval = &symval; | |
6540 | } | |
6541 | ||
6542 | // Get the symbol value. | |
6543 | Symbol_value<32>::Value value = psymval->value(arm_relobj, 0); | |
6544 | ||
6545 | // Owing to pipelining, the PC relative branches below actually skip | |
6546 | // two instructions when the branch offset is 0. | |
6547 | Arm_address destination; | |
6548 | switch (r_type) | |
6549 | { | |
6550 | case elfcpp::R_ARM_CALL: | |
6551 | case elfcpp::R_ARM_JUMP24: | |
6552 | case elfcpp::R_ARM_PLT32: | |
6553 | // ARM branches. | |
6554 | destination = value + addend + 8; | |
6555 | break; | |
6556 | case elfcpp::R_ARM_THM_CALL: | |
6557 | case elfcpp::R_ARM_THM_XPC22: | |
6558 | case elfcpp::R_ARM_THM_JUMP24: | |
6559 | case elfcpp::R_ARM_THM_JUMP19: | |
6560 | // THUMB branches. | |
6561 | destination = value + addend + 4; | |
6562 | break; | |
6563 | default: | |
6564 | gold_unreachable(); | |
6565 | } | |
6566 | ||
6567 | Stub_type stub_type = | |
6568 | Reloc_stub::stub_type_for_reloc(r_type, address, destination, | |
6569 | target_is_thumb); | |
6570 | ||
6571 | // This reloc does not need a stub. | |
6572 | if (stub_type == arm_stub_none) | |
6573 | return; | |
6574 | ||
6575 | // Try looking up an existing stub from a stub table. | |
2ea97941 | 6576 | Stub_table<big_endian>* stub_table = |
eb44217c | 6577 | arm_relobj->stub_table(relinfo->data_shndx); |
2ea97941 | 6578 | gold_assert(stub_table != NULL); |
eb44217c DK |
6579 | |
6580 | // Locate stub by destination. | |
6581 | Reloc_stub::Key stub_key(stub_type, gsym, arm_relobj, r_sym, addend); | |
6582 | ||
6583 | // Create a stub if there is not one already | |
2ea97941 | 6584 | Reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
eb44217c DK |
6585 | if (stub == NULL) |
6586 | { | |
6587 | // create a new stub and add it to stub table. | |
6588 | stub = this->stub_factory().make_reloc_stub(stub_type); | |
2ea97941 | 6589 | stub_table->add_reloc_stub(stub, stub_key); |
eb44217c DK |
6590 | } |
6591 | ||
6592 | // Record the destination address. | |
6593 | stub->set_destination_address(destination | |
6594 | | (target_is_thumb ? 1 : 0)); | |
6595 | } | |
6596 | ||
6597 | // This function scans a relocation sections for stub generation. | |
6598 | // The template parameter Relocate must be a class type which provides | |
6599 | // a single function, relocate(), which implements the machine | |
6600 | // specific part of a relocation. | |
6601 | ||
6602 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: | |
6603 | // SHT_REL or SHT_RELA. | |
6604 | ||
6605 | // PRELOCS points to the relocation data. RELOC_COUNT is the number | |
6606 | // of relocs. OUTPUT_SECTION is the output section. | |
6607 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be | |
6608 | // mapped to output offsets. | |
6609 | ||
6610 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and | |
6611 | // VIEW_SIZE is the size. These refer to the input section, unless | |
6612 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to | |
6613 | // the output section. | |
6614 | ||
6615 | template<bool big_endian> | |
6616 | template<int sh_type> | |
6617 | void inline | |
6618 | Target_arm<big_endian>::scan_reloc_section_for_stubs( | |
6619 | const Relocate_info<32, big_endian>* relinfo, | |
6620 | const unsigned char* prelocs, | |
6621 | size_t reloc_count, | |
6622 | Output_section* output_section, | |
6623 | bool needs_special_offset_handling, | |
6624 | const unsigned char* view, | |
6625 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
6626 | section_size_type) | |
6627 | { | |
6628 | typedef typename Reloc_types<sh_type, 32, big_endian>::Reloc Reltype; | |
6629 | const int reloc_size = | |
6630 | Reloc_types<sh_type, 32, big_endian>::reloc_size; | |
6631 | ||
6632 | Arm_relobj<big_endian>* arm_object = | |
6633 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
6634 | unsigned int local_count = arm_object->local_symbol_count(); | |
6635 | ||
6636 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; | |
6637 | ||
6638 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
6639 | { | |
6640 | Reltype reloc(prelocs); | |
6641 | ||
6642 | typename elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info(); | |
6643 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
6644 | unsigned int r_type = elfcpp::elf_r_type<32>(r_info); | |
6645 | ||
6646 | r_type = this->get_real_reloc_type(r_type); | |
6647 | ||
6648 | // Only a few relocation types need stubs. | |
6649 | if ((r_type != elfcpp::R_ARM_CALL) | |
6650 | && (r_type != elfcpp::R_ARM_JUMP24) | |
6651 | && (r_type != elfcpp::R_ARM_PLT32) | |
6652 | && (r_type != elfcpp::R_ARM_THM_CALL) | |
6653 | && (r_type != elfcpp::R_ARM_THM_XPC22) | |
6654 | && (r_type != elfcpp::R_ARM_THM_JUMP24) | |
6655 | && (r_type != elfcpp::R_ARM_THM_JUMP19)) | |
6656 | continue; | |
6657 | ||
2ea97941 | 6658 | section_offset_type offset = |
eb44217c DK |
6659 | convert_to_section_size_type(reloc.get_r_offset()); |
6660 | ||
6661 | if (needs_special_offset_handling) | |
6662 | { | |
2ea97941 ILT |
6663 | offset = output_section->output_offset(relinfo->object, |
6664 | relinfo->data_shndx, | |
6665 | offset); | |
6666 | if (offset == -1) | |
eb44217c DK |
6667 | continue; |
6668 | } | |
6669 | ||
6670 | // Get the addend. | |
6671 | Stub_addend_reader<sh_type, big_endian> stub_addend_reader; | |
6672 | elfcpp::Elf_types<32>::Elf_Swxword addend = | |
2ea97941 | 6673 | stub_addend_reader(r_type, view + offset, reloc); |
eb44217c DK |
6674 | |
6675 | const Sized_symbol<32>* sym; | |
6676 | ||
6677 | Symbol_value<32> symval; | |
6678 | const Symbol_value<32> *psymval; | |
6679 | if (r_sym < local_count) | |
6680 | { | |
6681 | sym = NULL; | |
6682 | psymval = arm_object->local_symbol(r_sym); | |
6683 | ||
6684 | // If the local symbol belongs to a section we are discarding, | |
6685 | // and that section is a debug section, try to find the | |
6686 | // corresponding kept section and map this symbol to its | |
6687 | // counterpart in the kept section. The symbol must not | |
6688 | // correspond to a section we are folding. | |
6689 | bool is_ordinary; | |
2ea97941 | 6690 | unsigned int shndx = psymval->input_shndx(&is_ordinary); |
eb44217c | 6691 | if (is_ordinary |
2ea97941 ILT |
6692 | && shndx != elfcpp::SHN_UNDEF |
6693 | && !arm_object->is_section_included(shndx) | |
6694 | && !(relinfo->symtab->is_section_folded(arm_object, shndx))) | |
eb44217c DK |
6695 | { |
6696 | if (comdat_behavior == CB_UNDETERMINED) | |
6697 | { | |
6698 | std::string name = | |
6699 | arm_object->section_name(relinfo->data_shndx); | |
6700 | comdat_behavior = get_comdat_behavior(name.c_str()); | |
6701 | } | |
6702 | if (comdat_behavior == CB_PRETEND) | |
6703 | { | |
6704 | bool found; | |
6705 | typename elfcpp::Elf_types<32>::Elf_Addr value = | |
2ea97941 | 6706 | arm_object->map_to_kept_section(shndx, &found); |
eb44217c DK |
6707 | if (found) |
6708 | symval.set_output_value(value + psymval->input_value()); | |
6709 | else | |
6710 | symval.set_output_value(0); | |
6711 | } | |
6712 | else | |
6713 | { | |
6714 | symval.set_output_value(0); | |
6715 | } | |
6716 | symval.set_no_output_symtab_entry(); | |
6717 | psymval = &symval; | |
6718 | } | |
6719 | } | |
6720 | else | |
6721 | { | |
6722 | const Symbol* gsym = arm_object->global_symbol(r_sym); | |
6723 | gold_assert(gsym != NULL); | |
6724 | if (gsym->is_forwarder()) | |
6725 | gsym = relinfo->symtab->resolve_forwards(gsym); | |
6726 | ||
6727 | sym = static_cast<const Sized_symbol<32>*>(gsym); | |
6728 | if (sym->has_symtab_index()) | |
6729 | symval.set_output_symtab_index(sym->symtab_index()); | |
6730 | else | |
6731 | symval.set_no_output_symtab_entry(); | |
6732 | ||
6733 | // We need to compute the would-be final value of this global | |
6734 | // symbol. | |
6735 | const Symbol_table* symtab = relinfo->symtab; | |
6736 | const Sized_symbol<32>* sized_symbol = | |
6737 | symtab->get_sized_symbol<32>(gsym); | |
6738 | Symbol_table::Compute_final_value_status status; | |
6739 | Arm_address value = | |
6740 | symtab->compute_final_value<32>(sized_symbol, &status); | |
6741 | ||
6742 | // Skip this if the symbol has not output section. | |
6743 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) | |
6744 | continue; | |
6745 | ||
6746 | symval.set_output_value(value); | |
6747 | psymval = &symval; | |
6748 | } | |
6749 | ||
6750 | // If symbol is a section symbol, we don't know the actual type of | |
6751 | // destination. Give up. | |
6752 | if (psymval->is_section_symbol()) | |
6753 | continue; | |
6754 | ||
6755 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, | |
2ea97941 | 6756 | addend, view_address + offset); |
eb44217c DK |
6757 | } |
6758 | } | |
6759 | ||
6760 | // Scan an input section for stub generation. | |
6761 | ||
6762 | template<bool big_endian> | |
6763 | void | |
6764 | Target_arm<big_endian>::scan_section_for_stubs( | |
6765 | const Relocate_info<32, big_endian>* relinfo, | |
6766 | unsigned int sh_type, | |
6767 | const unsigned char* prelocs, | |
6768 | size_t reloc_count, | |
6769 | Output_section* output_section, | |
6770 | bool needs_special_offset_handling, | |
6771 | const unsigned char* view, | |
6772 | Arm_address view_address, | |
6773 | section_size_type view_size) | |
6774 | { | |
6775 | if (sh_type == elfcpp::SHT_REL) | |
6776 | this->scan_reloc_section_for_stubs<elfcpp::SHT_REL>( | |
6777 | relinfo, | |
6778 | prelocs, | |
6779 | reloc_count, | |
6780 | output_section, | |
6781 | needs_special_offset_handling, | |
6782 | view, | |
6783 | view_address, | |
6784 | view_size); | |
6785 | else if (sh_type == elfcpp::SHT_RELA) | |
6786 | // We do not support RELA type relocations yet. This is provided for | |
6787 | // completeness. | |
6788 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( | |
6789 | relinfo, | |
6790 | prelocs, | |
6791 | reloc_count, | |
6792 | output_section, | |
6793 | needs_special_offset_handling, | |
6794 | view, | |
6795 | view_address, | |
6796 | view_size); | |
6797 | else | |
6798 | gold_unreachable(); | |
6799 | } | |
6800 | ||
6801 | // Group input sections for stub generation. | |
6802 | // | |
6803 | // We goup input sections in an output sections so that the total size, | |
6804 | // including any padding space due to alignment is smaller than GROUP_SIZE | |
6805 | // unless the only input section in group is bigger than GROUP_SIZE already. | |
6806 | // Then an ARM stub table is created to follow the last input section | |
6807 | // in group. For each group an ARM stub table is created an is placed | |
6808 | // after the last group. If STUB_ALWATS_AFTER_BRANCH is false, we further | |
6809 | // extend the group after the stub table. | |
6810 | ||
6811 | template<bool big_endian> | |
6812 | void | |
6813 | Target_arm<big_endian>::group_sections( | |
2ea97941 | 6814 | Layout* layout, |
eb44217c DK |
6815 | section_size_type group_size, |
6816 | bool stubs_always_after_branch) | |
6817 | { | |
6818 | // Group input sections and insert stub table | |
6819 | Layout::Section_list section_list; | |
2ea97941 | 6820 | layout->get_allocated_sections(§ion_list); |
eb44217c DK |
6821 | for (Layout::Section_list::const_iterator p = section_list.begin(); |
6822 | p != section_list.end(); | |
6823 | ++p) | |
6824 | { | |
6825 | Arm_output_section<big_endian>* output_section = | |
6826 | Arm_output_section<big_endian>::as_arm_output_section(*p); | |
6827 | output_section->group_sections(group_size, stubs_always_after_branch, | |
6828 | this); | |
6829 | } | |
6830 | } | |
6831 | ||
6832 | // Relaxation hook. This is where we do stub generation. | |
6833 | ||
6834 | template<bool big_endian> | |
6835 | bool | |
6836 | Target_arm<big_endian>::do_relax( | |
6837 | int pass, | |
6838 | const Input_objects* input_objects, | |
6839 | Symbol_table* symtab, | |
2ea97941 | 6840 | Layout* layout) |
eb44217c DK |
6841 | { |
6842 | // No need to generate stubs if this is a relocatable link. | |
6843 | gold_assert(!parameters->options().relocatable()); | |
6844 | ||
6845 | // If this is the first pass, we need to group input sections into | |
6846 | // stub groups. | |
6847 | if (pass == 1) | |
6848 | { | |
6849 | // Determine the stub group size. The group size is the absolute | |
6850 | // value of the parameter --stub-group-size. If --stub-group-size | |
6851 | // is passed a negative value, we restict stubs to be always after | |
6852 | // the stubbed branches. | |
6853 | int32_t stub_group_size_param = | |
6854 | parameters->options().stub_group_size(); | |
6855 | bool stubs_always_after_branch = stub_group_size_param < 0; | |
6856 | section_size_type stub_group_size = abs(stub_group_size_param); | |
6857 | ||
6858 | if (stub_group_size == 1) | |
6859 | { | |
6860 | // Default value. | |
6861 | // Thumb branch range is +-4MB has to be used as the default | |
6862 | // maximum size (a given section can contain both ARM and Thumb | |
6863 | // code, so the worst case has to be taken into account). | |
6864 | // | |
6865 | // This value is 24K less than that, which allows for 2025 | |
6866 | // 12-byte stubs. If we exceed that, then we will fail to link. | |
6867 | // The user will have to relink with an explicit group size | |
6868 | // option. | |
6869 | stub_group_size = 4170000; | |
6870 | } | |
6871 | ||
2ea97941 | 6872 | group_sections(layout, stub_group_size, stubs_always_after_branch); |
eb44217c DK |
6873 | } |
6874 | ||
6875 | // clear changed flags for all stub_tables | |
6876 | typedef typename Stub_table_list::iterator Stub_table_iterator; | |
6877 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
6878 | sp != this->stub_tables_.end(); | |
6879 | ++sp) | |
6880 | (*sp)->set_has_been_changed(false); | |
6881 | ||
6882 | // scan relocs for stubs | |
6883 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); | |
6884 | op != input_objects->relobj_end(); | |
6885 | ++op) | |
6886 | { | |
6887 | Arm_relobj<big_endian>* arm_relobj = | |
6888 | Arm_relobj<big_endian>::as_arm_relobj(*op); | |
2ea97941 | 6889 | arm_relobj->scan_sections_for_stubs(this, symtab, layout); |
eb44217c DK |
6890 | } |
6891 | ||
6892 | bool any_stub_table_changed = false; | |
6893 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
6894 | (sp != this->stub_tables_.end()) && !any_stub_table_changed; | |
6895 | ++sp) | |
6896 | { | |
6897 | if ((*sp)->has_been_changed()) | |
6898 | any_stub_table_changed = true; | |
6899 | } | |
6900 | ||
6901 | return any_stub_table_changed; | |
6902 | } | |
6903 | ||
43d12afe DK |
6904 | // Relocate a stub. |
6905 | ||
6906 | template<bool big_endian> | |
6907 | void | |
6908 | Target_arm<big_endian>::relocate_stub( | |
6909 | Reloc_stub* stub, | |
6910 | const Relocate_info<32, big_endian>* relinfo, | |
6911 | Output_section* output_section, | |
6912 | unsigned char* view, | |
6913 | Arm_address address, | |
6914 | section_size_type view_size) | |
6915 | { | |
6916 | Relocate relocate; | |
2ea97941 ILT |
6917 | const Stub_template* stub_template = stub->stub_template(); |
6918 | for (size_t i = 0; i < stub_template->reloc_count(); i++) | |
43d12afe | 6919 | { |
2ea97941 ILT |
6920 | size_t reloc_insn_index = stub_template->reloc_insn_index(i); |
6921 | const Insn_template* insn = &stub_template->insns()[reloc_insn_index]; | |
43d12afe DK |
6922 | |
6923 | unsigned int r_type = insn->r_type(); | |
2ea97941 | 6924 | section_size_type reloc_offset = stub_template->reloc_offset(i); |
43d12afe DK |
6925 | section_size_type reloc_size = insn->size(); |
6926 | gold_assert(reloc_offset + reloc_size <= view_size); | |
6927 | ||
6928 | // This is the address of the stub destination. | |
6929 | Arm_address target = stub->reloc_target(i); | |
6930 | Symbol_value<32> symval; | |
6931 | symval.set_output_value(target); | |
6932 | ||
6933 | // Synthesize a fake reloc just in case. We don't have a symbol so | |
6934 | // we use 0. | |
6935 | unsigned char reloc_buffer[elfcpp::Elf_sizes<32>::rel_size]; | |
6936 | memset(reloc_buffer, 0, sizeof(reloc_buffer)); | |
6937 | elfcpp::Rel_write<32, big_endian> reloc_write(reloc_buffer); | |
6938 | reloc_write.put_r_offset(reloc_offset); | |
6939 | reloc_write.put_r_info(elfcpp::elf_r_info<32>(0, r_type)); | |
6940 | elfcpp::Rel<32, big_endian> rel(reloc_buffer); | |
6941 | ||
6942 | relocate.relocate(relinfo, this, output_section, | |
6943 | this->fake_relnum_for_stubs, rel, r_type, | |
6944 | NULL, &symval, view + reloc_offset, | |
6945 | address + reloc_offset, reloc_size); | |
6946 | } | |
6947 | } | |
6948 | ||
a0351a69 DK |
6949 | // Determine whether an object attribute tag takes an integer, a |
6950 | // string or both. | |
6951 | ||
6952 | template<bool big_endian> | |
6953 | int | |
6954 | Target_arm<big_endian>::do_attribute_arg_type(int tag) const | |
6955 | { | |
6956 | if (tag == Object_attribute::Tag_compatibility) | |
6957 | return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL | |
6958 | | Object_attribute::ATTR_TYPE_FLAG_STR_VAL); | |
6959 | else if (tag == elfcpp::Tag_nodefaults) | |
6960 | return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL | |
6961 | | Object_attribute::ATTR_TYPE_FLAG_NO_DEFAULT); | |
6962 | else if (tag == elfcpp::Tag_CPU_raw_name || tag == elfcpp::Tag_CPU_name) | |
6963 | return Object_attribute::ATTR_TYPE_FLAG_STR_VAL; | |
6964 | else if (tag < 32) | |
6965 | return Object_attribute::ATTR_TYPE_FLAG_INT_VAL; | |
6966 | else | |
6967 | return ((tag & 1) != 0 | |
6968 | ? Object_attribute::ATTR_TYPE_FLAG_STR_VAL | |
6969 | : Object_attribute::ATTR_TYPE_FLAG_INT_VAL); | |
6970 | } | |
6971 | ||
6972 | // Reorder attributes. | |
6973 | // | |
6974 | // The ABI defines that Tag_conformance should be emitted first, and that | |
6975 | // Tag_nodefaults should be second (if either is defined). This sets those | |
6976 | // two positions, and bumps up the position of all the remaining tags to | |
6977 | // compensate. | |
6978 | ||
6979 | template<bool big_endian> | |
6980 | int | |
6981 | Target_arm<big_endian>::do_attributes_order(int num) const | |
6982 | { | |
6983 | // Reorder the known object attributes in output. We want to move | |
6984 | // Tag_conformance to position 4 and Tag_conformance to position 5 | |
6985 | // and shift eveything between 4 .. Tag_conformance - 1 to make room. | |
6986 | if (num == 4) | |
6987 | return elfcpp::Tag_conformance; | |
6988 | if (num == 5) | |
6989 | return elfcpp::Tag_nodefaults; | |
6990 | if ((num - 2) < elfcpp::Tag_nodefaults) | |
6991 | return num - 2; | |
6992 | if ((num - 1) < elfcpp::Tag_conformance) | |
6993 | return num - 1; | |
6994 | return num; | |
6995 | } | |
4a657b0d DK |
6996 | |
6997 | template<bool big_endian> | |
6998 | class Target_selector_arm : public Target_selector | |
6999 | { | |
7000 | public: | |
7001 | Target_selector_arm() | |
7002 | : Target_selector(elfcpp::EM_ARM, 32, big_endian, | |
7003 | (big_endian ? "elf32-bigarm" : "elf32-littlearm")) | |
7004 | { } | |
7005 | ||
7006 | Target* | |
7007 | do_instantiate_target() | |
7008 | { return new Target_arm<big_endian>(); } | |
7009 | }; | |
7010 | ||
7011 | Target_selector_arm<false> target_selector_arm; | |
7012 | Target_selector_arm<true> target_selector_armbe; | |
7013 | ||
7014 | } // End anonymous namespace. |