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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, | |
bb0d3eb0 DK |
140 | // THUMB16_SPECIAL_TYPE is used by sub-classes of Stub for instruction |
141 | // templates with class-specific semantics. Currently this is used | |
142 | // only by the Cortex_a8_stub class for handling condition codes in | |
143 | // conditional branches. | |
144 | THUMB16_SPECIAL_TYPE, | |
b569affa DK |
145 | THUMB32_TYPE, |
146 | ARM_TYPE, | |
147 | DATA_TYPE | |
148 | }; | |
149 | ||
bb0d3eb0 | 150 | // Factory methods to create instruction templates in different formats. |
b569affa DK |
151 | |
152 | static const Insn_template | |
153 | thumb16_insn(uint32_t data) | |
154 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 0); } | |
155 | ||
bb0d3eb0 DK |
156 | // A Thumb conditional branch, in which the proper condition is inserted |
157 | // when we build the stub. | |
b569affa DK |
158 | static const Insn_template |
159 | thumb16_bcond_insn(uint32_t data) | |
bb0d3eb0 | 160 | { return Insn_template(data, THUMB16_SPECIAL_TYPE, elfcpp::R_ARM_NONE, 1); } |
b569affa DK |
161 | |
162 | static const Insn_template | |
163 | thumb32_insn(uint32_t data) | |
164 | { return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_NONE, 0); } | |
165 | ||
166 | static const Insn_template | |
167 | thumb32_b_insn(uint32_t data, int reloc_addend) | |
168 | { | |
169 | return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_THM_JUMP24, | |
170 | reloc_addend); | |
171 | } | |
172 | ||
173 | static const Insn_template | |
174 | arm_insn(uint32_t data) | |
175 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_NONE, 0); } | |
176 | ||
177 | static const Insn_template | |
178 | arm_rel_insn(unsigned data, int reloc_addend) | |
179 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_JUMP24, reloc_addend); } | |
180 | ||
181 | static const Insn_template | |
182 | data_word(unsigned data, unsigned int r_type, int reloc_addend) | |
183 | { return Insn_template(data, DATA_TYPE, r_type, reloc_addend); } | |
184 | ||
185 | // Accessors. This class is used for read-only objects so no modifiers | |
186 | // are provided. | |
187 | ||
188 | uint32_t | |
189 | data() const | |
190 | { return this->data_; } | |
191 | ||
192 | // Return the instruction sequence type of this. | |
193 | Type | |
194 | type() const | |
195 | { return this->type_; } | |
196 | ||
197 | // Return the ARM relocation type of this. | |
198 | unsigned int | |
199 | r_type() const | |
200 | { return this->r_type_; } | |
201 | ||
202 | int32_t | |
203 | reloc_addend() const | |
204 | { return this->reloc_addend_; } | |
205 | ||
bb0d3eb0 | 206 | // Return size of instruction template in bytes. |
b569affa DK |
207 | size_t |
208 | size() const; | |
209 | ||
bb0d3eb0 | 210 | // Return byte-alignment of instruction template. |
b569affa DK |
211 | unsigned |
212 | alignment() const; | |
213 | ||
214 | private: | |
215 | // We make the constructor private to ensure that only the factory | |
216 | // methods are used. | |
217 | inline | |
2ea97941 ILT |
218 | Insn_template(unsigned data, Type type, unsigned int r_type, int reloc_addend) |
219 | : data_(data), type_(type), r_type_(r_type), reloc_addend_(reloc_addend) | |
b569affa DK |
220 | { } |
221 | ||
222 | // Instruction specific data. This is used to store information like | |
223 | // some of the instruction bits. | |
224 | uint32_t data_; | |
225 | // Instruction template type. | |
226 | Type type_; | |
227 | // Relocation type if there is a relocation or R_ARM_NONE otherwise. | |
228 | unsigned int r_type_; | |
229 | // Relocation addend. | |
230 | int32_t reloc_addend_; | |
231 | }; | |
232 | ||
233 | // Macro for generating code to stub types. One entry per long/short | |
234 | // branch stub | |
235 | ||
236 | #define DEF_STUBS \ | |
237 | DEF_STUB(long_branch_any_any) \ | |
238 | DEF_STUB(long_branch_v4t_arm_thumb) \ | |
239 | DEF_STUB(long_branch_thumb_only) \ | |
240 | DEF_STUB(long_branch_v4t_thumb_thumb) \ | |
241 | DEF_STUB(long_branch_v4t_thumb_arm) \ | |
242 | DEF_STUB(short_branch_v4t_thumb_arm) \ | |
243 | DEF_STUB(long_branch_any_arm_pic) \ | |
244 | DEF_STUB(long_branch_any_thumb_pic) \ | |
245 | DEF_STUB(long_branch_v4t_thumb_thumb_pic) \ | |
246 | DEF_STUB(long_branch_v4t_arm_thumb_pic) \ | |
247 | DEF_STUB(long_branch_v4t_thumb_arm_pic) \ | |
248 | DEF_STUB(long_branch_thumb_only_pic) \ | |
249 | DEF_STUB(a8_veneer_b_cond) \ | |
250 | DEF_STUB(a8_veneer_b) \ | |
251 | DEF_STUB(a8_veneer_bl) \ | |
252 | DEF_STUB(a8_veneer_blx) | |
253 | ||
254 | // Stub types. | |
255 | ||
256 | #define DEF_STUB(x) arm_stub_##x, | |
257 | typedef enum | |
258 | { | |
259 | arm_stub_none, | |
260 | DEF_STUBS | |
261 | ||
262 | // First reloc stub type. | |
263 | arm_stub_reloc_first = arm_stub_long_branch_any_any, | |
264 | // Last reloc stub type. | |
265 | arm_stub_reloc_last = arm_stub_long_branch_thumb_only_pic, | |
266 | ||
267 | // First Cortex-A8 stub type. | |
268 | arm_stub_cortex_a8_first = arm_stub_a8_veneer_b_cond, | |
269 | // Last Cortex-A8 stub type. | |
270 | arm_stub_cortex_a8_last = arm_stub_a8_veneer_blx, | |
271 | ||
272 | // Last stub type. | |
273 | arm_stub_type_last = arm_stub_a8_veneer_blx | |
274 | } Stub_type; | |
275 | #undef DEF_STUB | |
276 | ||
277 | // Stub template class. Templates are meant to be read-only objects. | |
278 | // A stub template for a stub type contains all read-only attributes | |
279 | // common to all stubs of the same type. | |
280 | ||
281 | class Stub_template | |
282 | { | |
283 | public: | |
284 | Stub_template(Stub_type, const Insn_template*, size_t); | |
285 | ||
286 | ~Stub_template() | |
287 | { } | |
288 | ||
289 | // Return stub type. | |
290 | Stub_type | |
291 | type() const | |
292 | { return this->type_; } | |
293 | ||
294 | // Return an array of instruction templates. | |
295 | const Insn_template* | |
296 | insns() const | |
297 | { return this->insns_; } | |
298 | ||
299 | // Return size of template in number of instructions. | |
300 | size_t | |
301 | insn_count() const | |
302 | { return this->insn_count_; } | |
303 | ||
304 | // Return size of template in bytes. | |
305 | size_t | |
306 | size() const | |
307 | { return this->size_; } | |
308 | ||
309 | // Return alignment of the stub template. | |
310 | unsigned | |
311 | alignment() const | |
312 | { return this->alignment_; } | |
313 | ||
314 | // Return whether entry point is in thumb mode. | |
315 | bool | |
316 | entry_in_thumb_mode() const | |
317 | { return this->entry_in_thumb_mode_; } | |
318 | ||
319 | // Return number of relocations in this template. | |
320 | size_t | |
321 | reloc_count() const | |
322 | { return this->relocs_.size(); } | |
323 | ||
324 | // Return index of the I-th instruction with relocation. | |
325 | size_t | |
326 | reloc_insn_index(size_t i) const | |
327 | { | |
328 | gold_assert(i < this->relocs_.size()); | |
329 | return this->relocs_[i].first; | |
330 | } | |
331 | ||
332 | // Return the offset of the I-th instruction with relocation from the | |
333 | // beginning of the stub. | |
334 | section_size_type | |
335 | reloc_offset(size_t i) const | |
336 | { | |
337 | gold_assert(i < this->relocs_.size()); | |
338 | return this->relocs_[i].second; | |
339 | } | |
340 | ||
341 | private: | |
342 | // This contains information about an instruction template with a relocation | |
343 | // and its offset from start of stub. | |
344 | typedef std::pair<size_t, section_size_type> Reloc; | |
345 | ||
346 | // A Stub_template may not be copied. We want to share templates as much | |
347 | // as possible. | |
348 | Stub_template(const Stub_template&); | |
349 | Stub_template& operator=(const Stub_template&); | |
350 | ||
351 | // Stub type. | |
352 | Stub_type type_; | |
353 | // Points to an array of Insn_templates. | |
354 | const Insn_template* insns_; | |
355 | // Number of Insn_templates in insns_[]. | |
356 | size_t insn_count_; | |
357 | // Size of templated instructions in bytes. | |
358 | size_t size_; | |
359 | // Alignment of templated instructions. | |
360 | unsigned alignment_; | |
361 | // Flag to indicate if entry is in thumb mode. | |
362 | bool entry_in_thumb_mode_; | |
363 | // A table of reloc instruction indices and offsets. We can find these by | |
364 | // looking at the instruction templates but we pre-compute and then stash | |
365 | // them here for speed. | |
366 | std::vector<Reloc> relocs_; | |
367 | }; | |
368 | ||
369 | // | |
370 | // A class for code stubs. This is a base class for different type of | |
371 | // stubs used in the ARM target. | |
372 | // | |
373 | ||
374 | class Stub | |
375 | { | |
376 | private: | |
377 | static const section_offset_type invalid_offset = | |
378 | static_cast<section_offset_type>(-1); | |
379 | ||
380 | public: | |
2ea97941 ILT |
381 | Stub(const Stub_template* stub_template) |
382 | : stub_template_(stub_template), offset_(invalid_offset) | |
b569affa DK |
383 | { } |
384 | ||
385 | virtual | |
386 | ~Stub() | |
387 | { } | |
388 | ||
389 | // Return the stub template. | |
390 | const Stub_template* | |
391 | stub_template() const | |
392 | { return this->stub_template_; } | |
393 | ||
394 | // Return offset of code stub from beginning of its containing stub table. | |
395 | section_offset_type | |
396 | offset() const | |
397 | { | |
398 | gold_assert(this->offset_ != invalid_offset); | |
399 | return this->offset_; | |
400 | } | |
401 | ||
402 | // Set offset of code stub from beginning of its containing stub table. | |
403 | void | |
2ea97941 ILT |
404 | set_offset(section_offset_type offset) |
405 | { this->offset_ = offset; } | |
b569affa DK |
406 | |
407 | // Return the relocation target address of the i-th relocation in the | |
408 | // stub. This must be defined in a child class. | |
409 | Arm_address | |
410 | reloc_target(size_t i) | |
411 | { return this->do_reloc_target(i); } | |
412 | ||
413 | // Write a stub at output VIEW. BIG_ENDIAN select how a stub is written. | |
414 | void | |
415 | write(unsigned char* view, section_size_type view_size, bool big_endian) | |
416 | { this->do_write(view, view_size, big_endian); } | |
417 | ||
bb0d3eb0 DK |
418 | // Return the instruction for THUMB16_SPECIAL_TYPE instruction template |
419 | // for the i-th instruction. | |
420 | uint16_t | |
421 | thumb16_special(size_t i) | |
422 | { return this->do_thumb16_special(i); } | |
423 | ||
b569affa DK |
424 | protected: |
425 | // This must be defined in the child class. | |
426 | virtual Arm_address | |
427 | do_reloc_target(size_t) = 0; | |
428 | ||
bb0d3eb0 | 429 | // This may be overridden in the child class. |
b569affa | 430 | virtual void |
bb0d3eb0 DK |
431 | do_write(unsigned char* view, section_size_type view_size, bool big_endian) |
432 | { | |
433 | if (big_endian) | |
434 | this->do_fixed_endian_write<true>(view, view_size); | |
435 | else | |
436 | this->do_fixed_endian_write<false>(view, view_size); | |
437 | } | |
b569affa | 438 | |
bb0d3eb0 DK |
439 | // This must be overridden if a child class uses the THUMB16_SPECIAL_TYPE |
440 | // instruction template. | |
441 | virtual uint16_t | |
442 | do_thumb16_special(size_t) | |
443 | { gold_unreachable(); } | |
444 | ||
b569affa | 445 | private: |
bb0d3eb0 DK |
446 | // A template to implement do_write. |
447 | template<bool big_endian> | |
448 | void inline | |
449 | do_fixed_endian_write(unsigned char*, section_size_type); | |
450 | ||
b569affa DK |
451 | // Its template. |
452 | const Stub_template* stub_template_; | |
453 | // Offset within the section of containing this stub. | |
454 | section_offset_type offset_; | |
455 | }; | |
456 | ||
457 | // Reloc stub class. These are stubs we use to fix up relocation because | |
458 | // of limited branch ranges. | |
459 | ||
460 | class Reloc_stub : public Stub | |
461 | { | |
462 | public: | |
463 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); | |
464 | // We assume we never jump to this address. | |
465 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
466 | ||
467 | // Return destination address. | |
468 | Arm_address | |
469 | destination_address() const | |
470 | { | |
471 | gold_assert(this->destination_address_ != this->invalid_address); | |
472 | return this->destination_address_; | |
473 | } | |
474 | ||
475 | // Set destination address. | |
476 | void | |
477 | set_destination_address(Arm_address address) | |
478 | { | |
479 | gold_assert(address != this->invalid_address); | |
480 | this->destination_address_ = address; | |
481 | } | |
482 | ||
483 | // Reset destination address. | |
484 | void | |
485 | reset_destination_address() | |
486 | { this->destination_address_ = this->invalid_address; } | |
487 | ||
488 | // Determine stub type for a branch of a relocation of R_TYPE going | |
489 | // from BRANCH_ADDRESS to BRANCH_TARGET. If TARGET_IS_THUMB is set, | |
490 | // the branch target is a thumb instruction. TARGET is used for look | |
491 | // up ARM-specific linker settings. | |
492 | static Stub_type | |
493 | stub_type_for_reloc(unsigned int r_type, Arm_address branch_address, | |
494 | Arm_address branch_target, bool target_is_thumb); | |
495 | ||
496 | // Reloc_stub key. A key is logically a triplet of a stub type, a symbol | |
497 | // and an addend. Since we treat global and local symbol differently, we | |
498 | // use a Symbol object for a global symbol and a object-index pair for | |
499 | // a local symbol. | |
500 | class Key | |
501 | { | |
502 | public: | |
503 | // If SYMBOL is not null, this is a global symbol, we ignore RELOBJ and | |
504 | // R_SYM. Otherwise, this is a local symbol and RELOBJ must non-NULL | |
505 | // and R_SYM must not be invalid_index. | |
2ea97941 ILT |
506 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, |
507 | unsigned int r_sym, int32_t addend) | |
508 | : stub_type_(stub_type), addend_(addend) | |
b569affa | 509 | { |
2ea97941 | 510 | if (symbol != NULL) |
b569affa DK |
511 | { |
512 | this->r_sym_ = Reloc_stub::invalid_index; | |
2ea97941 | 513 | this->u_.symbol = symbol; |
b569affa DK |
514 | } |
515 | else | |
516 | { | |
2ea97941 ILT |
517 | gold_assert(relobj != NULL && r_sym != invalid_index); |
518 | this->r_sym_ = r_sym; | |
519 | this->u_.relobj = relobj; | |
b569affa DK |
520 | } |
521 | } | |
522 | ||
523 | ~Key() | |
524 | { } | |
525 | ||
526 | // Accessors: Keys are meant to be read-only object so no modifiers are | |
527 | // provided. | |
528 | ||
529 | // Return stub type. | |
530 | Stub_type | |
531 | stub_type() const | |
532 | { return this->stub_type_; } | |
533 | ||
534 | // Return the local symbol index or invalid_index. | |
535 | unsigned int | |
536 | r_sym() const | |
537 | { return this->r_sym_; } | |
538 | ||
539 | // Return the symbol if there is one. | |
540 | const Symbol* | |
541 | symbol() const | |
542 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
543 | ||
544 | // Return the relobj if there is one. | |
545 | const Relobj* | |
546 | relobj() const | |
547 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
548 | ||
549 | // Whether this equals to another key k. | |
550 | bool | |
551 | eq(const Key& k) const | |
552 | { | |
553 | return ((this->stub_type_ == k.stub_type_) | |
554 | && (this->r_sym_ == k.r_sym_) | |
555 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
556 | ? (this->u_.relobj == k.u_.relobj) | |
557 | : (this->u_.symbol == k.u_.symbol)) | |
558 | && (this->addend_ == k.addend_)); | |
559 | } | |
560 | ||
561 | // Return a hash value. | |
562 | size_t | |
563 | hash_value() const | |
564 | { | |
565 | return (this->stub_type_ | |
566 | ^ this->r_sym_ | |
567 | ^ gold::string_hash<char>( | |
568 | (this->r_sym_ != Reloc_stub::invalid_index) | |
569 | ? this->u_.relobj->name().c_str() | |
570 | : this->u_.symbol->name()) | |
571 | ^ this->addend_); | |
572 | } | |
573 | ||
574 | // Functors for STL associative containers. | |
575 | struct hash | |
576 | { | |
577 | size_t | |
578 | operator()(const Key& k) const | |
579 | { return k.hash_value(); } | |
580 | }; | |
581 | ||
582 | struct equal_to | |
583 | { | |
584 | bool | |
585 | operator()(const Key& k1, const Key& k2) const | |
586 | { return k1.eq(k2); } | |
587 | }; | |
588 | ||
589 | // Name of key. This is mainly for debugging. | |
590 | std::string | |
591 | name() const; | |
592 | ||
593 | private: | |
594 | // Stub type. | |
595 | Stub_type stub_type_; | |
596 | // If this is a local symbol, this is the index in the defining object. | |
597 | // Otherwise, it is invalid_index for a global symbol. | |
598 | unsigned int r_sym_; | |
599 | // If r_sym_ is invalid index. This points to a global symbol. | |
600 | // Otherwise, this points a relobj. We used the unsized and target | |
eb44217c | 601 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and |
b569affa DK |
602 | // Arm_relobj. This is done to avoid making the stub class a template |
603 | // as most of the stub machinery is endianity-neutral. However, it | |
604 | // may require a bit of casting done by users of this class. | |
605 | union | |
606 | { | |
607 | const Symbol* symbol; | |
608 | const Relobj* relobj; | |
609 | } u_; | |
610 | // Addend associated with a reloc. | |
611 | int32_t addend_; | |
612 | }; | |
613 | ||
614 | protected: | |
615 | // Reloc_stubs are created via a stub factory. So these are protected. | |
2ea97941 ILT |
616 | Reloc_stub(const Stub_template* stub_template) |
617 | : Stub(stub_template), destination_address_(invalid_address) | |
b569affa DK |
618 | { } |
619 | ||
620 | ~Reloc_stub() | |
621 | { } | |
622 | ||
623 | friend class Stub_factory; | |
624 | ||
b569affa DK |
625 | // Return the relocation target address of the i-th relocation in the |
626 | // stub. | |
627 | Arm_address | |
628 | do_reloc_target(size_t i) | |
629 | { | |
630 | // All reloc stub have only one relocation. | |
631 | gold_assert(i == 0); | |
632 | return this->destination_address_; | |
633 | } | |
634 | ||
bb0d3eb0 DK |
635 | private: |
636 | // Address of destination. | |
637 | Arm_address destination_address_; | |
638 | }; | |
b569affa | 639 | |
bb0d3eb0 DK |
640 | // Cortex-A8 stub class. We need a Cortex-A8 stub to redirect any 32-bit |
641 | // THUMB branch that meets the following conditions: | |
642 | // | |
643 | // 1. The branch straddles across a page boundary. i.e. lower 12-bit of | |
644 | // branch address is 0xffe. | |
645 | // 2. The branch target address is in the same page as the first word of the | |
646 | // branch. | |
647 | // 3. The branch follows a 32-bit instruction which is not a branch. | |
648 | // | |
649 | // To do the fix up, we need to store the address of the branch instruction | |
650 | // and its target at least. We also need to store the original branch | |
651 | // instruction bits for the condition code in a conditional branch. The | |
652 | // condition code is used in a special instruction template. We also want | |
653 | // to identify input sections needing Cortex-A8 workaround quickly. We store | |
654 | // extra information about object and section index of the code section | |
655 | // containing a branch being fixed up. The information is used to mark | |
656 | // the code section when we finalize the Cortex-A8 stubs. | |
657 | // | |
b569affa | 658 | |
bb0d3eb0 DK |
659 | class Cortex_a8_stub : public Stub |
660 | { | |
661 | public: | |
662 | ~Cortex_a8_stub() | |
663 | { } | |
664 | ||
665 | // Return the object of the code section containing the branch being fixed | |
666 | // up. | |
667 | Relobj* | |
668 | relobj() const | |
669 | { return this->relobj_; } | |
670 | ||
671 | // Return the section index of the code section containing the branch being | |
672 | // fixed up. | |
673 | unsigned int | |
674 | shndx() const | |
675 | { return this->shndx_; } | |
676 | ||
677 | // Return the source address of stub. This is the address of the original | |
678 | // branch instruction. LSB is 1 always set to indicate that it is a THUMB | |
679 | // instruction. | |
680 | Arm_address | |
681 | source_address() const | |
682 | { return this->source_address_; } | |
683 | ||
684 | // Return the destination address of the stub. This is the branch taken | |
685 | // address of the original branch instruction. LSB is 1 if it is a THUMB | |
686 | // instruction address. | |
687 | Arm_address | |
688 | destination_address() const | |
689 | { return this->destination_address_; } | |
690 | ||
691 | // Return the instruction being fixed up. | |
692 | uint32_t | |
693 | original_insn() const | |
694 | { return this->original_insn_; } | |
695 | ||
696 | protected: | |
697 | // Cortex_a8_stubs are created via a stub factory. So these are protected. | |
698 | Cortex_a8_stub(const Stub_template* stub_template, Relobj* relobj, | |
699 | unsigned int shndx, Arm_address source_address, | |
700 | Arm_address destination_address, uint32_t original_insn) | |
701 | : Stub(stub_template), relobj_(relobj), shndx_(shndx), | |
702 | source_address_(source_address | 1U), | |
703 | destination_address_(destination_address), | |
704 | original_insn_(original_insn) | |
705 | { } | |
706 | ||
707 | friend class Stub_factory; | |
708 | ||
709 | // Return the relocation target address of the i-th relocation in the | |
710 | // stub. | |
711 | Arm_address | |
712 | do_reloc_target(size_t i) | |
713 | { | |
714 | if (this->stub_template()->type() == arm_stub_a8_veneer_b_cond) | |
715 | { | |
716 | // The conditional branch veneer has two relocations. | |
717 | gold_assert(i < 2); | |
718 | return i == 0 ? this->source_address_ + 4 : this->destination_address_; | |
719 | } | |
720 | else | |
721 | { | |
722 | // All other Cortex-A8 stubs have only one relocation. | |
723 | gold_assert(i == 0); | |
724 | return this->destination_address_; | |
725 | } | |
726 | } | |
727 | ||
728 | // Return an instruction for the THUMB16_SPECIAL_TYPE instruction template. | |
729 | uint16_t | |
730 | do_thumb16_special(size_t); | |
731 | ||
732 | private: | |
733 | // Object of the code section containing the branch being fixed up. | |
734 | Relobj* relobj_; | |
735 | // Section index of the code section containing the branch begin fixed up. | |
736 | unsigned int shndx_; | |
737 | // Source address of original branch. | |
738 | Arm_address source_address_; | |
739 | // Destination address of the original branch. | |
b569affa | 740 | Arm_address destination_address_; |
bb0d3eb0 DK |
741 | // Original branch instruction. This is needed for copying the condition |
742 | // code from a condition branch to its stub. | |
743 | uint32_t original_insn_; | |
b569affa DK |
744 | }; |
745 | ||
746 | // Stub factory class. | |
747 | ||
748 | class Stub_factory | |
749 | { | |
750 | public: | |
751 | // Return the unique instance of this class. | |
752 | static const Stub_factory& | |
753 | get_instance() | |
754 | { | |
755 | static Stub_factory singleton; | |
756 | return singleton; | |
757 | } | |
758 | ||
759 | // Make a relocation stub. | |
760 | Reloc_stub* | |
761 | make_reloc_stub(Stub_type stub_type) const | |
762 | { | |
763 | gold_assert(stub_type >= arm_stub_reloc_first | |
764 | && stub_type <= arm_stub_reloc_last); | |
765 | return new Reloc_stub(this->stub_templates_[stub_type]); | |
766 | } | |
767 | ||
bb0d3eb0 DK |
768 | // Make a Cortex-A8 stub. |
769 | Cortex_a8_stub* | |
770 | make_cortex_a8_stub(Stub_type stub_type, Relobj* relobj, unsigned int shndx, | |
771 | Arm_address source, Arm_address destination, | |
772 | uint32_t original_insn) const | |
773 | { | |
774 | gold_assert(stub_type >= arm_stub_cortex_a8_first | |
775 | && stub_type <= arm_stub_cortex_a8_last); | |
776 | return new Cortex_a8_stub(this->stub_templates_[stub_type], relobj, shndx, | |
777 | source, destination, original_insn); | |
778 | } | |
779 | ||
b569affa DK |
780 | private: |
781 | // Constructor and destructor are protected since we only return a single | |
782 | // instance created in Stub_factory::get_instance(). | |
783 | ||
784 | Stub_factory(); | |
785 | ||
786 | // A Stub_factory may not be copied since it is a singleton. | |
787 | Stub_factory(const Stub_factory&); | |
788 | Stub_factory& operator=(Stub_factory&); | |
789 | ||
790 | // Stub templates. These are initialized in the constructor. | |
791 | const Stub_template* stub_templates_[arm_stub_type_last+1]; | |
792 | }; | |
793 | ||
56ee5e00 DK |
794 | // A class to hold stubs for the ARM target. |
795 | ||
796 | template<bool big_endian> | |
797 | class Stub_table : public Output_data | |
798 | { | |
799 | public: | |
2ea97941 | 800 | Stub_table(Arm_input_section<big_endian>* owner) |
2fb7225c DK |
801 | : Output_data(), owner_(owner), reloc_stubs_(), cortex_a8_stubs_(), |
802 | prev_data_size_(0), prev_addralign_(1) | |
56ee5e00 DK |
803 | { } |
804 | ||
805 | ~Stub_table() | |
806 | { } | |
807 | ||
808 | // Owner of this stub table. | |
809 | Arm_input_section<big_endian>* | |
810 | owner() const | |
811 | { return this->owner_; } | |
812 | ||
813 | // Whether this stub table is empty. | |
814 | bool | |
815 | empty() const | |
2fb7225c | 816 | { return this->reloc_stubs_.empty() && this->cortex_a8_stubs_.empty(); } |
56ee5e00 DK |
817 | |
818 | // Return the current data size. | |
819 | off_t | |
820 | current_data_size() const | |
821 | { return this->current_data_size_for_child(); } | |
822 | ||
823 | // Add a STUB with using KEY. Caller is reponsible for avoid adding | |
824 | // if already a STUB with the same key has been added. | |
825 | void | |
2fb7225c DK |
826 | add_reloc_stub(Reloc_stub* stub, const Reloc_stub::Key& key) |
827 | { | |
828 | const Stub_template* stub_template = stub->stub_template(); | |
829 | gold_assert(stub_template->type() == key.stub_type()); | |
830 | this->reloc_stubs_[key] = stub; | |
831 | } | |
832 | ||
833 | // Add a Cortex-A8 STUB that fixes up a THUMB branch at ADDRESS. | |
834 | // Caller is reponsible for avoid adding if already a STUB with the same | |
835 | // address has been added. | |
836 | void | |
837 | add_cortex_a8_stub(Arm_address address, Cortex_a8_stub* stub) | |
838 | { | |
839 | std::pair<Arm_address, Cortex_a8_stub*> value(address, stub); | |
840 | this->cortex_a8_stubs_.insert(value); | |
841 | } | |
842 | ||
843 | // Remove all Cortex-A8 stubs. | |
844 | void | |
845 | remove_all_cortex_a8_stubs(); | |
56ee5e00 DK |
846 | |
847 | // Look up a relocation stub using KEY. Return NULL if there is none. | |
848 | Reloc_stub* | |
849 | find_reloc_stub(const Reloc_stub::Key& key) const | |
850 | { | |
851 | typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.find(key); | |
852 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; | |
853 | } | |
854 | ||
855 | // Relocate stubs in this stub table. | |
856 | void | |
857 | relocate_stubs(const Relocate_info<32, big_endian>*, | |
858 | Target_arm<big_endian>*, Output_section*, | |
859 | unsigned char*, Arm_address, section_size_type); | |
860 | ||
2fb7225c DK |
861 | // Update data size and alignment at the end of a relaxation pass. Return |
862 | // true if either data size or alignment is different from that of the | |
863 | // previous relaxation pass. | |
864 | bool | |
865 | update_data_size_and_addralign(); | |
866 | ||
867 | // Finalize stubs. Set the offsets of all stubs and mark input sections | |
868 | // needing the Cortex-A8 workaround. | |
869 | void | |
870 | finalize_stubs(); | |
871 | ||
872 | // Apply Cortex-A8 workaround to an address range. | |
873 | void | |
874 | apply_cortex_a8_workaround_to_address_range(Target_arm<big_endian>*, | |
875 | unsigned char*, Arm_address, | |
876 | section_size_type); | |
877 | ||
56ee5e00 DK |
878 | protected: |
879 | // Write out section contents. | |
880 | void | |
881 | do_write(Output_file*); | |
882 | ||
883 | // Return the required alignment. | |
884 | uint64_t | |
885 | do_addralign() const | |
2fb7225c | 886 | { return this->prev_addralign_; } |
56ee5e00 DK |
887 | |
888 | // Reset address and file offset. | |
889 | void | |
2fb7225c DK |
890 | do_reset_address_and_file_offset() |
891 | { this->set_current_data_size_for_child(this->prev_data_size_); } | |
56ee5e00 | 892 | |
2fb7225c DK |
893 | // Set final data size. |
894 | void | |
895 | set_final_data_size() | |
896 | { this->set_data_size(this->current_data_size()); } | |
897 | ||
56ee5e00 | 898 | private: |
2fb7225c DK |
899 | // Relocate one stub. |
900 | void | |
901 | relocate_stub(Stub*, const Relocate_info<32, big_endian>*, | |
902 | Target_arm<big_endian>*, Output_section*, | |
903 | unsigned char*, Arm_address, section_size_type); | |
904 | ||
905 | // Unordered map of relocation stubs. | |
56ee5e00 DK |
906 | typedef |
907 | Unordered_map<Reloc_stub::Key, Reloc_stub*, Reloc_stub::Key::hash, | |
908 | Reloc_stub::Key::equal_to> | |
909 | Reloc_stub_map; | |
910 | ||
2fb7225c DK |
911 | // List of Cortex-A8 stubs ordered by addresses of branches being |
912 | // fixed up in output. | |
913 | typedef std::map<Arm_address, Cortex_a8_stub*> Cortex_a8_stub_list; | |
914 | ||
56ee5e00 DK |
915 | // Owner of this stub table. |
916 | Arm_input_section<big_endian>* owner_; | |
56ee5e00 DK |
917 | // The relocation stubs. |
918 | Reloc_stub_map reloc_stubs_; | |
2fb7225c DK |
919 | // The cortex_a8_stubs. |
920 | Cortex_a8_stub_list cortex_a8_stubs_; | |
921 | // data size of this in the previous pass. | |
922 | off_t prev_data_size_; | |
923 | // address alignment of this in the previous pass. | |
924 | uint64_t prev_addralign_; | |
56ee5e00 DK |
925 | }; |
926 | ||
10ad9fe5 DK |
927 | // A class to wrap an ordinary input section containing executable code. |
928 | ||
929 | template<bool big_endian> | |
930 | class Arm_input_section : public Output_relaxed_input_section | |
931 | { | |
932 | public: | |
2ea97941 ILT |
933 | Arm_input_section(Relobj* relobj, unsigned int shndx) |
934 | : Output_relaxed_input_section(relobj, shndx, 1), | |
10ad9fe5 DK |
935 | original_addralign_(1), original_size_(0), stub_table_(NULL) |
936 | { } | |
937 | ||
938 | ~Arm_input_section() | |
939 | { } | |
940 | ||
941 | // Initialize. | |
942 | void | |
943 | init(); | |
944 | ||
945 | // Whether this is a stub table owner. | |
946 | bool | |
947 | is_stub_table_owner() const | |
948 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } | |
949 | ||
950 | // Return the stub table. | |
951 | Stub_table<big_endian>* | |
952 | stub_table() const | |
953 | { return this->stub_table_; } | |
954 | ||
955 | // Set the stub_table. | |
956 | void | |
2ea97941 ILT |
957 | set_stub_table(Stub_table<big_endian>* stub_table) |
958 | { this->stub_table_ = stub_table; } | |
10ad9fe5 | 959 | |
07f508a2 DK |
960 | // Downcast a base pointer to an Arm_input_section pointer. This is |
961 | // not type-safe but we only use Arm_input_section not the base class. | |
962 | static Arm_input_section<big_endian>* | |
963 | as_arm_input_section(Output_relaxed_input_section* poris) | |
964 | { return static_cast<Arm_input_section<big_endian>*>(poris); } | |
965 | ||
10ad9fe5 DK |
966 | protected: |
967 | // Write data to output file. | |
968 | void | |
969 | do_write(Output_file*); | |
970 | ||
971 | // Return required alignment of this. | |
972 | uint64_t | |
973 | do_addralign() const | |
974 | { | |
975 | if (this->is_stub_table_owner()) | |
976 | return std::max(this->stub_table_->addralign(), | |
977 | this->original_addralign_); | |
978 | else | |
979 | return this->original_addralign_; | |
980 | } | |
981 | ||
982 | // Finalize data size. | |
983 | void | |
984 | set_final_data_size(); | |
985 | ||
986 | // Reset address and file offset. | |
987 | void | |
988 | do_reset_address_and_file_offset(); | |
989 | ||
990 | // Output offset. | |
991 | bool | |
2ea97941 ILT |
992 | do_output_offset(const Relobj* object, unsigned int shndx, |
993 | section_offset_type offset, | |
10ad9fe5 DK |
994 | section_offset_type* poutput) const |
995 | { | |
996 | if ((object == this->relobj()) | |
2ea97941 ILT |
997 | && (shndx == this->shndx()) |
998 | && (offset >= 0) | |
999 | && (convert_types<uint64_t, section_offset_type>(offset) | |
10ad9fe5 DK |
1000 | <= this->original_size_)) |
1001 | { | |
2ea97941 | 1002 | *poutput = offset; |
10ad9fe5 DK |
1003 | return true; |
1004 | } | |
1005 | else | |
1006 | return false; | |
1007 | } | |
1008 | ||
1009 | private: | |
1010 | // Copying is not allowed. | |
1011 | Arm_input_section(const Arm_input_section&); | |
1012 | Arm_input_section& operator=(const Arm_input_section&); | |
1013 | ||
1014 | // Address alignment of the original input section. | |
1015 | uint64_t original_addralign_; | |
1016 | // Section size of the original input section. | |
1017 | uint64_t original_size_; | |
1018 | // Stub table. | |
1019 | Stub_table<big_endian>* stub_table_; | |
1020 | }; | |
1021 | ||
07f508a2 DK |
1022 | // Arm output section class. This is defined mainly to add a number of |
1023 | // stub generation methods. | |
1024 | ||
1025 | template<bool big_endian> | |
1026 | class Arm_output_section : public Output_section | |
1027 | { | |
1028 | public: | |
2ea97941 ILT |
1029 | Arm_output_section(const char* name, elfcpp::Elf_Word type, |
1030 | elfcpp::Elf_Xword flags) | |
1031 | : Output_section(name, type, flags) | |
07f508a2 DK |
1032 | { } |
1033 | ||
1034 | ~Arm_output_section() | |
1035 | { } | |
1036 | ||
1037 | // Group input sections for stub generation. | |
1038 | void | |
1039 | group_sections(section_size_type, bool, Target_arm<big_endian>*); | |
1040 | ||
1041 | // Downcast a base pointer to an Arm_output_section pointer. This is | |
1042 | // not type-safe but we only use Arm_output_section not the base class. | |
1043 | static Arm_output_section<big_endian>* | |
1044 | as_arm_output_section(Output_section* os) | |
1045 | { return static_cast<Arm_output_section<big_endian>*>(os); } | |
1046 | ||
1047 | private: | |
1048 | // For convenience. | |
1049 | typedef Output_section::Input_section Input_section; | |
1050 | typedef Output_section::Input_section_list Input_section_list; | |
1051 | ||
1052 | // Create a stub group. | |
1053 | void create_stub_group(Input_section_list::const_iterator, | |
1054 | Input_section_list::const_iterator, | |
1055 | Input_section_list::const_iterator, | |
1056 | Target_arm<big_endian>*, | |
1057 | std::vector<Output_relaxed_input_section*>*); | |
1058 | }; | |
1059 | ||
8ffa3667 DK |
1060 | // Arm_relobj class. |
1061 | ||
1062 | template<bool big_endian> | |
1063 | class Arm_relobj : public Sized_relobj<32, big_endian> | |
1064 | { | |
1065 | public: | |
1066 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
1067 | ||
2ea97941 | 1068 | Arm_relobj(const std::string& name, Input_file* input_file, off_t offset, |
8ffa3667 | 1069 | const typename elfcpp::Ehdr<32, big_endian>& ehdr) |
2ea97941 | 1070 | : Sized_relobj<32, big_endian>(name, input_file, offset, ehdr), |
a0351a69 | 1071 | stub_tables_(), local_symbol_is_thumb_function_(), |
2fb7225c | 1072 | attributes_section_data_(NULL), section_has_cortex_a8_workaround_(NULL) |
8ffa3667 DK |
1073 | { } |
1074 | ||
1075 | ~Arm_relobj() | |
a0351a69 | 1076 | { delete this->attributes_section_data_; } |
8ffa3667 DK |
1077 | |
1078 | // Return the stub table of the SHNDX-th section if there is one. | |
1079 | Stub_table<big_endian>* | |
2ea97941 | 1080 | stub_table(unsigned int shndx) const |
8ffa3667 | 1081 | { |
2ea97941 ILT |
1082 | gold_assert(shndx < this->stub_tables_.size()); |
1083 | return this->stub_tables_[shndx]; | |
8ffa3667 DK |
1084 | } |
1085 | ||
1086 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. | |
1087 | void | |
2ea97941 | 1088 | set_stub_table(unsigned int shndx, Stub_table<big_endian>* stub_table) |
8ffa3667 | 1089 | { |
2ea97941 ILT |
1090 | gold_assert(shndx < this->stub_tables_.size()); |
1091 | this->stub_tables_[shndx] = stub_table; | |
8ffa3667 DK |
1092 | } |
1093 | ||
1094 | // Whether a local symbol is a THUMB function. R_SYM is the symbol table | |
1095 | // index. This is only valid after do_count_local_symbol is called. | |
1096 | bool | |
1097 | local_symbol_is_thumb_function(unsigned int r_sym) const | |
1098 | { | |
1099 | gold_assert(r_sym < this->local_symbol_is_thumb_function_.size()); | |
1100 | return this->local_symbol_is_thumb_function_[r_sym]; | |
1101 | } | |
1102 | ||
1103 | // Scan all relocation sections for stub generation. | |
1104 | void | |
1105 | scan_sections_for_stubs(Target_arm<big_endian>*, const Symbol_table*, | |
1106 | const Layout*); | |
1107 | ||
1108 | // Convert regular input section with index SHNDX to a relaxed section. | |
1109 | void | |
2ea97941 | 1110 | convert_input_section_to_relaxed_section(unsigned shndx) |
8ffa3667 DK |
1111 | { |
1112 | // The stubs have relocations and we need to process them after writing | |
1113 | // out the stubs. So relocation now must follow section write. | |
2ea97941 | 1114 | this->invalidate_section_offset(shndx); |
8ffa3667 DK |
1115 | this->set_relocs_must_follow_section_writes(); |
1116 | } | |
1117 | ||
1118 | // Downcast a base pointer to an Arm_relobj pointer. This is | |
1119 | // not type-safe but we only use Arm_relobj not the base class. | |
1120 | static Arm_relobj<big_endian>* | |
2ea97941 ILT |
1121 | as_arm_relobj(Relobj* relobj) |
1122 | { return static_cast<Arm_relobj<big_endian>*>(relobj); } | |
8ffa3667 | 1123 | |
d5b40221 DK |
1124 | // Processor-specific flags in ELF file header. This is valid only after |
1125 | // reading symbols. | |
1126 | elfcpp::Elf_Word | |
1127 | processor_specific_flags() const | |
1128 | { return this->processor_specific_flags_; } | |
1129 | ||
a0351a69 DK |
1130 | // Attribute section data This is the contents of the .ARM.attribute section |
1131 | // if there is one. | |
1132 | const Attributes_section_data* | |
1133 | attributes_section_data() const | |
1134 | { return this->attributes_section_data_; } | |
1135 | ||
2fb7225c DK |
1136 | // Whether a section contains any Cortex-A8 workaround. |
1137 | bool | |
1138 | section_has_cortex_a8_workaround(unsigned int shndx) const | |
1139 | { | |
1140 | return (this->section_has_cortex_a8_workaround_ != NULL | |
1141 | && (*this->section_has_cortex_a8_workaround_)[shndx]); | |
1142 | } | |
1143 | ||
1144 | // Mark a section that has Cortex-A8 workaround. | |
1145 | void | |
1146 | mark_section_for_cortex_a8_workaround(unsigned int shndx) | |
1147 | { | |
1148 | if (this->section_has_cortex_a8_workaround_ == NULL) | |
1149 | this->section_has_cortex_a8_workaround_ = | |
1150 | new std::vector<bool>(this->shnum(), false); | |
1151 | (*this->section_has_cortex_a8_workaround_)[shndx] = true; | |
1152 | } | |
1153 | ||
8ffa3667 DK |
1154 | protected: |
1155 | // Post constructor setup. | |
1156 | void | |
1157 | do_setup() | |
1158 | { | |
1159 | // Call parent's setup method. | |
1160 | Sized_relobj<32, big_endian>::do_setup(); | |
1161 | ||
1162 | // Initialize look-up tables. | |
1163 | Stub_table_list empty_stub_table_list(this->shnum(), NULL); | |
1164 | this->stub_tables_.swap(empty_stub_table_list); | |
1165 | } | |
1166 | ||
1167 | // Count the local symbols. | |
1168 | void | |
1169 | do_count_local_symbols(Stringpool_template<char>*, | |
1170 | Stringpool_template<char>*); | |
1171 | ||
1172 | void | |
43d12afe | 1173 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, |
8ffa3667 DK |
1174 | const unsigned char* pshdrs, |
1175 | typename Sized_relobj<32, big_endian>::Views* pivews); | |
1176 | ||
d5b40221 DK |
1177 | // Read the symbol information. |
1178 | void | |
1179 | do_read_symbols(Read_symbols_data* sd); | |
1180 | ||
99e5bff2 DK |
1181 | // Process relocs for garbage collection. |
1182 | void | |
1183 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); | |
1184 | ||
8ffa3667 DK |
1185 | private: |
1186 | // List of stub tables. | |
1187 | typedef std::vector<Stub_table<big_endian>*> Stub_table_list; | |
1188 | Stub_table_list stub_tables_; | |
1189 | // Bit vector to tell if a local symbol is a thumb function or not. | |
1190 | // This is only valid after do_count_local_symbol is called. | |
1191 | std::vector<bool> local_symbol_is_thumb_function_; | |
d5b40221 DK |
1192 | // processor-specific flags in ELF file header. |
1193 | elfcpp::Elf_Word processor_specific_flags_; | |
a0351a69 DK |
1194 | // Object attributes if there is an .ARM.attributes section or NULL. |
1195 | Attributes_section_data* attributes_section_data_; | |
2fb7225c DK |
1196 | // Bitmap to indicate sections with Cortex-A8 workaround or NULL. |
1197 | std::vector<bool>* section_has_cortex_a8_workaround_; | |
d5b40221 DK |
1198 | }; |
1199 | ||
1200 | // Arm_dynobj class. | |
1201 | ||
1202 | template<bool big_endian> | |
1203 | class Arm_dynobj : public Sized_dynobj<32, big_endian> | |
1204 | { | |
1205 | public: | |
2ea97941 | 1206 | Arm_dynobj(const std::string& name, Input_file* input_file, off_t offset, |
d5b40221 | 1207 | const elfcpp::Ehdr<32, big_endian>& ehdr) |
2ea97941 ILT |
1208 | : Sized_dynobj<32, big_endian>(name, input_file, offset, ehdr), |
1209 | processor_specific_flags_(0), attributes_section_data_(NULL) | |
d5b40221 DK |
1210 | { } |
1211 | ||
1212 | ~Arm_dynobj() | |
a0351a69 | 1213 | { delete this->attributes_section_data_; } |
d5b40221 DK |
1214 | |
1215 | // Downcast a base pointer to an Arm_relobj pointer. This is | |
1216 | // not type-safe but we only use Arm_relobj not the base class. | |
1217 | static Arm_dynobj<big_endian>* | |
1218 | as_arm_dynobj(Dynobj* dynobj) | |
1219 | { return static_cast<Arm_dynobj<big_endian>*>(dynobj); } | |
1220 | ||
1221 | // Processor-specific flags in ELF file header. This is valid only after | |
1222 | // reading symbols. | |
1223 | elfcpp::Elf_Word | |
1224 | processor_specific_flags() const | |
1225 | { return this->processor_specific_flags_; } | |
1226 | ||
a0351a69 DK |
1227 | // Attributes section data. |
1228 | const Attributes_section_data* | |
1229 | attributes_section_data() const | |
1230 | { return this->attributes_section_data_; } | |
1231 | ||
d5b40221 DK |
1232 | protected: |
1233 | // Read the symbol information. | |
1234 | void | |
1235 | do_read_symbols(Read_symbols_data* sd); | |
1236 | ||
1237 | private: | |
1238 | // processor-specific flags in ELF file header. | |
1239 | elfcpp::Elf_Word processor_specific_flags_; | |
a0351a69 DK |
1240 | // Object attributes if there is an .ARM.attributes section or NULL. |
1241 | Attributes_section_data* attributes_section_data_; | |
8ffa3667 DK |
1242 | }; |
1243 | ||
e9bbb538 DK |
1244 | // Functor to read reloc addends during stub generation. |
1245 | ||
1246 | template<int sh_type, bool big_endian> | |
1247 | struct Stub_addend_reader | |
1248 | { | |
1249 | // Return the addend for a relocation of a particular type. Depending | |
1250 | // on whether this is a REL or RELA relocation, read the addend from a | |
1251 | // view or from a Reloc object. | |
1252 | elfcpp::Elf_types<32>::Elf_Swxword | |
1253 | operator()( | |
1254 | unsigned int /* r_type */, | |
1255 | const unsigned char* /* view */, | |
1256 | const typename Reloc_types<sh_type, | |
ebd95253 | 1257 | 32, big_endian>::Reloc& /* reloc */) const; |
e9bbb538 DK |
1258 | }; |
1259 | ||
1260 | // Specialized Stub_addend_reader for SHT_REL type relocation sections. | |
1261 | ||
1262 | template<bool big_endian> | |
1263 | struct Stub_addend_reader<elfcpp::SHT_REL, big_endian> | |
1264 | { | |
1265 | elfcpp::Elf_types<32>::Elf_Swxword | |
1266 | operator()( | |
1267 | unsigned int, | |
1268 | const unsigned char*, | |
1269 | const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const; | |
1270 | }; | |
1271 | ||
1272 | // Specialized Stub_addend_reader for RELA type relocation sections. | |
1273 | // We currently do not handle RELA type relocation sections but it is trivial | |
1274 | // to implement the addend reader. This is provided for completeness and to | |
1275 | // make it easier to add support for RELA relocation sections in the future. | |
1276 | ||
1277 | template<bool big_endian> | |
1278 | struct Stub_addend_reader<elfcpp::SHT_RELA, big_endian> | |
1279 | { | |
1280 | elfcpp::Elf_types<32>::Elf_Swxword | |
1281 | operator()( | |
1282 | unsigned int, | |
1283 | const unsigned char*, | |
1284 | const typename Reloc_types<elfcpp::SHT_RELA, 32, | |
ebd95253 DK |
1285 | big_endian>::Reloc& reloc) const |
1286 | { return reloc.get_r_addend(); } | |
e9bbb538 DK |
1287 | }; |
1288 | ||
c121c671 DK |
1289 | // Utilities for manipulating integers of up to 32-bits |
1290 | ||
1291 | namespace utils | |
1292 | { | |
1293 | // Sign extend an n-bit unsigned integer stored in an uint32_t into | |
1294 | // an int32_t. NO_BITS must be between 1 to 32. | |
1295 | template<int no_bits> | |
1296 | static inline int32_t | |
1297 | sign_extend(uint32_t bits) | |
1298 | { | |
96d49306 | 1299 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
1300 | if (no_bits == 32) |
1301 | return static_cast<int32_t>(bits); | |
1302 | uint32_t mask = (~((uint32_t) 0)) >> (32 - no_bits); | |
1303 | bits &= mask; | |
1304 | uint32_t top_bit = 1U << (no_bits - 1); | |
1305 | int32_t as_signed = static_cast<int32_t>(bits); | |
1306 | return (bits & top_bit) ? as_signed + (-top_bit * 2) : as_signed; | |
1307 | } | |
1308 | ||
1309 | // Detects overflow of an NO_BITS integer stored in a uint32_t. | |
1310 | template<int no_bits> | |
1311 | static inline bool | |
1312 | has_overflow(uint32_t bits) | |
1313 | { | |
96d49306 | 1314 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
1315 | if (no_bits == 32) |
1316 | return false; | |
1317 | int32_t max = (1 << (no_bits - 1)) - 1; | |
1318 | int32_t min = -(1 << (no_bits - 1)); | |
1319 | int32_t as_signed = static_cast<int32_t>(bits); | |
1320 | return as_signed > max || as_signed < min; | |
1321 | } | |
1322 | ||
5e445df6 ILT |
1323 | // Detects overflow of an NO_BITS integer stored in a uint32_t when it |
1324 | // fits in the given number of bits as either a signed or unsigned value. | |
1325 | // For example, has_signed_unsigned_overflow<8> would check | |
1326 | // -128 <= bits <= 255 | |
1327 | template<int no_bits> | |
1328 | static inline bool | |
1329 | has_signed_unsigned_overflow(uint32_t bits) | |
1330 | { | |
1331 | gold_assert(no_bits >= 2 && no_bits <= 32); | |
1332 | if (no_bits == 32) | |
1333 | return false; | |
1334 | int32_t max = static_cast<int32_t>((1U << no_bits) - 1); | |
1335 | int32_t min = -(1 << (no_bits - 1)); | |
1336 | int32_t as_signed = static_cast<int32_t>(bits); | |
1337 | return as_signed > max || as_signed < min; | |
1338 | } | |
1339 | ||
c121c671 DK |
1340 | // Select bits from A and B using bits in MASK. For each n in [0..31], |
1341 | // the n-th bit in the result is chosen from the n-th bits of A and B. | |
1342 | // A zero selects A and a one selects B. | |
1343 | static inline uint32_t | |
1344 | bit_select(uint32_t a, uint32_t b, uint32_t mask) | |
1345 | { return (a & ~mask) | (b & mask); } | |
1346 | }; | |
1347 | ||
4a657b0d DK |
1348 | template<bool big_endian> |
1349 | class Target_arm : public Sized_target<32, big_endian> | |
1350 | { | |
1351 | public: | |
1352 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
1353 | Reloc_section; | |
1354 | ||
2daedcd6 DK |
1355 | // When were are relocating a stub, we pass this as the relocation number. |
1356 | static const size_t fake_relnum_for_stubs = static_cast<size_t>(-1); | |
1357 | ||
a6d1ef57 DK |
1358 | Target_arm() |
1359 | : Sized_target<32, big_endian>(&arm_info), | |
1360 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), | |
1361 | copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL), stub_tables_(), | |
a0351a69 DK |
1362 | stub_factory_(Stub_factory::get_instance()), may_use_blx_(false), |
1363 | should_force_pic_veneer_(false), arm_input_section_map_(), | |
1364 | attributes_section_data_(NULL) | |
a6d1ef57 | 1365 | { } |
4a657b0d | 1366 | |
b569affa DK |
1367 | // Whether we can use BLX. |
1368 | bool | |
1369 | may_use_blx() const | |
1370 | { return this->may_use_blx_; } | |
1371 | ||
1372 | // Set use-BLX flag. | |
1373 | void | |
1374 | set_may_use_blx(bool value) | |
1375 | { this->may_use_blx_ = value; } | |
1376 | ||
1377 | // Whether we force PCI branch veneers. | |
1378 | bool | |
1379 | should_force_pic_veneer() const | |
1380 | { return this->should_force_pic_veneer_; } | |
1381 | ||
1382 | // Set PIC veneer flag. | |
1383 | void | |
1384 | set_should_force_pic_veneer(bool value) | |
1385 | { this->should_force_pic_veneer_ = value; } | |
1386 | ||
1387 | // Whether we use THUMB-2 instructions. | |
1388 | bool | |
1389 | using_thumb2() const | |
1390 | { | |
a0351a69 DK |
1391 | Object_attribute* attr = |
1392 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1393 | int arch = attr->int_value(); | |
1394 | return arch == elfcpp::TAG_CPU_ARCH_V6T2 || arch >= elfcpp::TAG_CPU_ARCH_V7; | |
b569affa DK |
1395 | } |
1396 | ||
1397 | // Whether we use THUMB/THUMB-2 instructions only. | |
1398 | bool | |
1399 | using_thumb_only() const | |
1400 | { | |
a0351a69 DK |
1401 | Object_attribute* attr = |
1402 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1403 | if (attr->int_value() != elfcpp::TAG_CPU_ARCH_V7 | |
1404 | && attr->int_value() != elfcpp::TAG_CPU_ARCH_V7E_M) | |
1405 | return false; | |
1406 | attr = this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile); | |
1407 | return attr->int_value() == 'M'; | |
b569affa DK |
1408 | } |
1409 | ||
d204b6e9 DK |
1410 | // Whether we have an NOP instruction. If not, use mov r0, r0 instead. |
1411 | bool | |
1412 | may_use_arm_nop() const | |
1413 | { | |
a0351a69 DK |
1414 | Object_attribute* attr = |
1415 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1416 | int arch = attr->int_value(); | |
1417 | return (arch == elfcpp::TAG_CPU_ARCH_V6T2 | |
1418 | || arch == elfcpp::TAG_CPU_ARCH_V6K | |
1419 | || arch == elfcpp::TAG_CPU_ARCH_V7 | |
1420 | || arch == elfcpp::TAG_CPU_ARCH_V7E_M); | |
d204b6e9 DK |
1421 | } |
1422 | ||
51938283 DK |
1423 | // Whether we have THUMB-2 NOP.W instruction. |
1424 | bool | |
1425 | may_use_thumb2_nop() const | |
1426 | { | |
a0351a69 DK |
1427 | Object_attribute* attr = |
1428 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1429 | int arch = attr->int_value(); | |
1430 | return (arch == elfcpp::TAG_CPU_ARCH_V6T2 | |
1431 | || arch == elfcpp::TAG_CPU_ARCH_V7 | |
1432 | || arch == elfcpp::TAG_CPU_ARCH_V7E_M); | |
51938283 DK |
1433 | } |
1434 | ||
4a657b0d DK |
1435 | // Process the relocations to determine unreferenced sections for |
1436 | // garbage collection. | |
1437 | void | |
ad0f2072 | 1438 | gc_process_relocs(Symbol_table* symtab, |
4a657b0d DK |
1439 | Layout* layout, |
1440 | Sized_relobj<32, big_endian>* object, | |
1441 | unsigned int data_shndx, | |
1442 | unsigned int sh_type, | |
1443 | const unsigned char* prelocs, | |
1444 | size_t reloc_count, | |
1445 | Output_section* output_section, | |
1446 | bool needs_special_offset_handling, | |
1447 | size_t local_symbol_count, | |
1448 | const unsigned char* plocal_symbols); | |
1449 | ||
1450 | // Scan the relocations to look for symbol adjustments. | |
1451 | void | |
ad0f2072 | 1452 | scan_relocs(Symbol_table* symtab, |
4a657b0d DK |
1453 | Layout* layout, |
1454 | Sized_relobj<32, big_endian>* object, | |
1455 | unsigned int data_shndx, | |
1456 | unsigned int sh_type, | |
1457 | const unsigned char* prelocs, | |
1458 | size_t reloc_count, | |
1459 | Output_section* output_section, | |
1460 | bool needs_special_offset_handling, | |
1461 | size_t local_symbol_count, | |
1462 | const unsigned char* plocal_symbols); | |
1463 | ||
1464 | // Finalize the sections. | |
1465 | void | |
f59f41f3 | 1466 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
4a657b0d | 1467 | |
94cdfcff | 1468 | // Return the value to use for a dynamic symbol which requires special |
4a657b0d DK |
1469 | // treatment. |
1470 | uint64_t | |
1471 | do_dynsym_value(const Symbol*) const; | |
1472 | ||
1473 | // Relocate a section. | |
1474 | void | |
1475 | relocate_section(const Relocate_info<32, big_endian>*, | |
1476 | unsigned int sh_type, | |
1477 | const unsigned char* prelocs, | |
1478 | size_t reloc_count, | |
1479 | Output_section* output_section, | |
1480 | bool needs_special_offset_handling, | |
1481 | unsigned char* view, | |
ebabffbd | 1482 | Arm_address view_address, |
364c7fa5 ILT |
1483 | section_size_type view_size, |
1484 | const Reloc_symbol_changes*); | |
4a657b0d DK |
1485 | |
1486 | // Scan the relocs during a relocatable link. | |
1487 | void | |
ad0f2072 | 1488 | scan_relocatable_relocs(Symbol_table* symtab, |
4a657b0d DK |
1489 | Layout* layout, |
1490 | Sized_relobj<32, big_endian>* object, | |
1491 | unsigned int data_shndx, | |
1492 | unsigned int sh_type, | |
1493 | const unsigned char* prelocs, | |
1494 | size_t reloc_count, | |
1495 | Output_section* output_section, | |
1496 | bool needs_special_offset_handling, | |
1497 | size_t local_symbol_count, | |
1498 | const unsigned char* plocal_symbols, | |
1499 | Relocatable_relocs*); | |
1500 | ||
1501 | // Relocate a section during a relocatable link. | |
1502 | void | |
1503 | relocate_for_relocatable(const Relocate_info<32, big_endian>*, | |
1504 | unsigned int sh_type, | |
1505 | const unsigned char* prelocs, | |
1506 | size_t reloc_count, | |
1507 | Output_section* output_section, | |
1508 | off_t offset_in_output_section, | |
1509 | const Relocatable_relocs*, | |
1510 | unsigned char* view, | |
ebabffbd | 1511 | Arm_address view_address, |
4a657b0d DK |
1512 | section_size_type view_size, |
1513 | unsigned char* reloc_view, | |
1514 | section_size_type reloc_view_size); | |
1515 | ||
1516 | // Return whether SYM is defined by the ABI. | |
1517 | bool | |
1518 | do_is_defined_by_abi(Symbol* sym) const | |
1519 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
1520 | ||
94cdfcff DK |
1521 | // Return the size of the GOT section. |
1522 | section_size_type | |
1523 | got_size() | |
1524 | { | |
1525 | gold_assert(this->got_ != NULL); | |
1526 | return this->got_->data_size(); | |
1527 | } | |
1528 | ||
4a657b0d | 1529 | // Map platform-specific reloc types |
a6d1ef57 DK |
1530 | static unsigned int |
1531 | get_real_reloc_type (unsigned int r_type); | |
4a657b0d | 1532 | |
55da9579 DK |
1533 | // |
1534 | // Methods to support stub-generations. | |
1535 | // | |
1536 | ||
1537 | // Return the stub factory | |
1538 | const Stub_factory& | |
1539 | stub_factory() const | |
1540 | { return this->stub_factory_; } | |
1541 | ||
1542 | // Make a new Arm_input_section object. | |
1543 | Arm_input_section<big_endian>* | |
1544 | new_arm_input_section(Relobj*, unsigned int); | |
1545 | ||
1546 | // Find the Arm_input_section object corresponding to the SHNDX-th input | |
1547 | // section of RELOBJ. | |
1548 | Arm_input_section<big_endian>* | |
2ea97941 | 1549 | find_arm_input_section(Relobj* relobj, unsigned int shndx) const; |
55da9579 DK |
1550 | |
1551 | // Make a new Stub_table | |
1552 | Stub_table<big_endian>* | |
1553 | new_stub_table(Arm_input_section<big_endian>*); | |
1554 | ||
eb44217c DK |
1555 | // Scan a section for stub generation. |
1556 | void | |
1557 | scan_section_for_stubs(const Relocate_info<32, big_endian>*, unsigned int, | |
1558 | const unsigned char*, size_t, Output_section*, | |
1559 | bool, const unsigned char*, Arm_address, | |
1560 | section_size_type); | |
1561 | ||
43d12afe DK |
1562 | // Relocate a stub. |
1563 | void | |
2fb7225c | 1564 | relocate_stub(Stub*, const Relocate_info<32, big_endian>*, |
43d12afe DK |
1565 | Output_section*, unsigned char*, Arm_address, |
1566 | section_size_type); | |
1567 | ||
b569affa | 1568 | // Get the default ARM target. |
43d12afe | 1569 | static Target_arm<big_endian>* |
b569affa DK |
1570 | default_target() |
1571 | { | |
1572 | gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM | |
1573 | && parameters->target().is_big_endian() == big_endian); | |
43d12afe DK |
1574 | return static_cast<Target_arm<big_endian>*>( |
1575 | parameters->sized_target<32, big_endian>()); | |
b569affa DK |
1576 | } |
1577 | ||
55da9579 DK |
1578 | // Whether relocation type uses LSB to distinguish THUMB addresses. |
1579 | static bool | |
1580 | reloc_uses_thumb_bit(unsigned int r_type); | |
1581 | ||
d5b40221 | 1582 | protected: |
eb44217c DK |
1583 | // Make an ELF object. |
1584 | Object* | |
1585 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1586 | const elfcpp::Ehdr<32, big_endian>& ehdr); | |
1587 | ||
1588 | Object* | |
1589 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1590 | const elfcpp::Ehdr<32, !big_endian>&) | |
1591 | { gold_unreachable(); } | |
1592 | ||
1593 | Object* | |
1594 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1595 | const elfcpp::Ehdr<64, false>&) | |
1596 | { gold_unreachable(); } | |
1597 | ||
1598 | Object* | |
1599 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1600 | const elfcpp::Ehdr<64, true>&) | |
1601 | { gold_unreachable(); } | |
1602 | ||
1603 | // Make an output section. | |
1604 | Output_section* | |
1605 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
1606 | elfcpp::Elf_Xword flags) | |
1607 | { return new Arm_output_section<big_endian>(name, type, flags); } | |
1608 | ||
d5b40221 DK |
1609 | void |
1610 | do_adjust_elf_header(unsigned char* view, int len) const; | |
1611 | ||
eb44217c DK |
1612 | // We only need to generate stubs, and hence perform relaxation if we are |
1613 | // not doing relocatable linking. | |
1614 | bool | |
1615 | do_may_relax() const | |
1616 | { return !parameters->options().relocatable(); } | |
1617 | ||
1618 | bool | |
1619 | do_relax(int, const Input_objects*, Symbol_table*, Layout*); | |
1620 | ||
a0351a69 DK |
1621 | // Determine whether an object attribute tag takes an integer, a |
1622 | // string or both. | |
1623 | int | |
1624 | do_attribute_arg_type(int tag) const; | |
1625 | ||
1626 | // Reorder tags during output. | |
1627 | int | |
1628 | do_attributes_order(int num) const; | |
1629 | ||
4a657b0d DK |
1630 | private: |
1631 | // The class which scans relocations. | |
1632 | class Scan | |
1633 | { | |
1634 | public: | |
1635 | Scan() | |
bec53400 | 1636 | : issued_non_pic_error_(false) |
4a657b0d DK |
1637 | { } |
1638 | ||
1639 | inline void | |
ad0f2072 | 1640 | local(Symbol_table* symtab, Layout* layout, Target_arm* target, |
4a657b0d DK |
1641 | Sized_relobj<32, big_endian>* object, |
1642 | unsigned int data_shndx, | |
1643 | Output_section* output_section, | |
1644 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1645 | const elfcpp::Sym<32, big_endian>& lsym); | |
1646 | ||
1647 | inline void | |
ad0f2072 | 1648 | global(Symbol_table* symtab, Layout* layout, Target_arm* target, |
4a657b0d DK |
1649 | Sized_relobj<32, big_endian>* object, |
1650 | unsigned int data_shndx, | |
1651 | Output_section* output_section, | |
1652 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1653 | Symbol* gsym); | |
1654 | ||
1655 | private: | |
1656 | static void | |
1657 | unsupported_reloc_local(Sized_relobj<32, big_endian>*, | |
1658 | unsigned int r_type); | |
1659 | ||
1660 | static void | |
1661 | unsupported_reloc_global(Sized_relobj<32, big_endian>*, | |
1662 | unsigned int r_type, Symbol*); | |
bec53400 DK |
1663 | |
1664 | void | |
1665 | check_non_pic(Relobj*, unsigned int r_type); | |
1666 | ||
1667 | // Almost identical to Symbol::needs_plt_entry except that it also | |
1668 | // handles STT_ARM_TFUNC. | |
1669 | static bool | |
1670 | symbol_needs_plt_entry(const Symbol* sym) | |
1671 | { | |
1672 | // An undefined symbol from an executable does not need a PLT entry. | |
1673 | if (sym->is_undefined() && !parameters->options().shared()) | |
1674 | return false; | |
1675 | ||
1676 | return (!parameters->doing_static_link() | |
1677 | && (sym->type() == elfcpp::STT_FUNC | |
1678 | || sym->type() == elfcpp::STT_ARM_TFUNC) | |
1679 | && (sym->is_from_dynobj() | |
1680 | || sym->is_undefined() | |
1681 | || sym->is_preemptible())); | |
1682 | } | |
1683 | ||
1684 | // Whether we have issued an error about a non-PIC compilation. | |
1685 | bool issued_non_pic_error_; | |
4a657b0d DK |
1686 | }; |
1687 | ||
1688 | // The class which implements relocation. | |
1689 | class Relocate | |
1690 | { | |
1691 | public: | |
1692 | Relocate() | |
1693 | { } | |
1694 | ||
1695 | ~Relocate() | |
1696 | { } | |
1697 | ||
bec53400 DK |
1698 | // Return whether the static relocation needs to be applied. |
1699 | inline bool | |
1700 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
1701 | int ref_flags, | |
1702 | bool is_32bit, | |
1703 | Output_section* output_section); | |
1704 | ||
4a657b0d DK |
1705 | // Do a relocation. Return false if the caller should not issue |
1706 | // any warnings about this relocation. | |
1707 | inline bool | |
1708 | relocate(const Relocate_info<32, big_endian>*, Target_arm*, | |
1709 | Output_section*, size_t relnum, | |
1710 | const elfcpp::Rel<32, big_endian>&, | |
1711 | unsigned int r_type, const Sized_symbol<32>*, | |
1712 | const Symbol_value<32>*, | |
ebabffbd | 1713 | unsigned char*, Arm_address, |
4a657b0d | 1714 | section_size_type); |
c121c671 DK |
1715 | |
1716 | // Return whether we want to pass flag NON_PIC_REF for this | |
f4e5969c DK |
1717 | // reloc. This means the relocation type accesses a symbol not via |
1718 | // GOT or PLT. | |
c121c671 DK |
1719 | static inline bool |
1720 | reloc_is_non_pic (unsigned int r_type) | |
1721 | { | |
1722 | switch (r_type) | |
1723 | { | |
f4e5969c DK |
1724 | // These relocation types reference GOT or PLT entries explicitly. |
1725 | case elfcpp::R_ARM_GOT_BREL: | |
1726 | case elfcpp::R_ARM_GOT_ABS: | |
1727 | case elfcpp::R_ARM_GOT_PREL: | |
1728 | case elfcpp::R_ARM_GOT_BREL12: | |
1729 | case elfcpp::R_ARM_PLT32_ABS: | |
1730 | case elfcpp::R_ARM_TLS_GD32: | |
1731 | case elfcpp::R_ARM_TLS_LDM32: | |
1732 | case elfcpp::R_ARM_TLS_IE32: | |
1733 | case elfcpp::R_ARM_TLS_IE12GP: | |
1734 | ||
1735 | // These relocate types may use PLT entries. | |
c121c671 | 1736 | case elfcpp::R_ARM_CALL: |
f4e5969c | 1737 | case elfcpp::R_ARM_THM_CALL: |
c121c671 | 1738 | case elfcpp::R_ARM_JUMP24: |
f4e5969c DK |
1739 | case elfcpp::R_ARM_THM_JUMP24: |
1740 | case elfcpp::R_ARM_THM_JUMP19: | |
1741 | case elfcpp::R_ARM_PLT32: | |
1742 | case elfcpp::R_ARM_THM_XPC22: | |
c121c671 | 1743 | return false; |
f4e5969c DK |
1744 | |
1745 | default: | |
1746 | return true; | |
c121c671 DK |
1747 | } |
1748 | } | |
4a657b0d DK |
1749 | }; |
1750 | ||
1751 | // A class which returns the size required for a relocation type, | |
1752 | // used while scanning relocs during a relocatable link. | |
1753 | class Relocatable_size_for_reloc | |
1754 | { | |
1755 | public: | |
1756 | unsigned int | |
1757 | get_size_for_reloc(unsigned int, Relobj*); | |
1758 | }; | |
1759 | ||
94cdfcff DK |
1760 | // Get the GOT section, creating it if necessary. |
1761 | Output_data_got<32, big_endian>* | |
1762 | got_section(Symbol_table*, Layout*); | |
1763 | ||
1764 | // Get the GOT PLT section. | |
1765 | Output_data_space* | |
1766 | got_plt_section() const | |
1767 | { | |
1768 | gold_assert(this->got_plt_ != NULL); | |
1769 | return this->got_plt_; | |
1770 | } | |
1771 | ||
1772 | // Create a PLT entry for a global symbol. | |
1773 | void | |
1774 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1775 | ||
1776 | // Get the PLT section. | |
1777 | const Output_data_plt_arm<big_endian>* | |
1778 | plt_section() const | |
1779 | { | |
1780 | gold_assert(this->plt_ != NULL); | |
1781 | return this->plt_; | |
1782 | } | |
1783 | ||
1784 | // Get the dynamic reloc section, creating it if necessary. | |
1785 | Reloc_section* | |
1786 | rel_dyn_section(Layout*); | |
1787 | ||
1788 | // Return true if the symbol may need a COPY relocation. | |
1789 | // References from an executable object to non-function symbols | |
1790 | // defined in a dynamic object may need a COPY relocation. | |
1791 | bool | |
1792 | may_need_copy_reloc(Symbol* gsym) | |
1793 | { | |
966d4097 DK |
1794 | return (gsym->type() != elfcpp::STT_ARM_TFUNC |
1795 | && gsym->may_need_copy_reloc()); | |
94cdfcff DK |
1796 | } |
1797 | ||
1798 | // Add a potential copy relocation. | |
1799 | void | |
1800 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
1801 | Sized_relobj<32, big_endian>* object, | |
2ea97941 | 1802 | unsigned int shndx, Output_section* output_section, |
94cdfcff DK |
1803 | Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc) |
1804 | { | |
1805 | this->copy_relocs_.copy_reloc(symtab, layout, | |
1806 | symtab->get_sized_symbol<32>(sym), | |
2ea97941 | 1807 | object, shndx, output_section, reloc, |
94cdfcff DK |
1808 | this->rel_dyn_section(layout)); |
1809 | } | |
1810 | ||
d5b40221 DK |
1811 | // Whether two EABI versions are compatible. |
1812 | static bool | |
1813 | are_eabi_versions_compatible(elfcpp::Elf_Word v1, elfcpp::Elf_Word v2); | |
1814 | ||
1815 | // Merge processor-specific flags from input object and those in the ELF | |
1816 | // header of the output. | |
1817 | void | |
1818 | merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word); | |
1819 | ||
a0351a69 DK |
1820 | // Get the secondary compatible architecture. |
1821 | static int | |
1822 | get_secondary_compatible_arch(const Attributes_section_data*); | |
1823 | ||
1824 | // Set the secondary compatible architecture. | |
1825 | static void | |
1826 | set_secondary_compatible_arch(Attributes_section_data*, int); | |
1827 | ||
1828 | static int | |
1829 | tag_cpu_arch_combine(const char*, int, int*, int, int); | |
1830 | ||
1831 | // Helper to print AEABI enum tag value. | |
1832 | static std::string | |
1833 | aeabi_enum_name(unsigned int); | |
1834 | ||
1835 | // Return string value for TAG_CPU_name. | |
1836 | static std::string | |
1837 | tag_cpu_name_value(unsigned int); | |
1838 | ||
1839 | // Merge object attributes from input object and those in the output. | |
1840 | void | |
1841 | merge_object_attributes(const char*, const Attributes_section_data*); | |
1842 | ||
1843 | // Helper to get an AEABI object attribute | |
1844 | Object_attribute* | |
1845 | get_aeabi_object_attribute(int tag) const | |
1846 | { | |
1847 | Attributes_section_data* pasd = this->attributes_section_data_; | |
1848 | gold_assert(pasd != NULL); | |
1849 | Object_attribute* attr = | |
1850 | pasd->get_attribute(Object_attribute::OBJ_ATTR_PROC, tag); | |
1851 | gold_assert(attr != NULL); | |
1852 | return attr; | |
1853 | } | |
1854 | ||
eb44217c DK |
1855 | // |
1856 | // Methods to support stub-generations. | |
1857 | // | |
d5b40221 | 1858 | |
eb44217c DK |
1859 | // Group input sections for stub generation. |
1860 | void | |
1861 | group_sections(Layout*, section_size_type, bool); | |
d5b40221 | 1862 | |
eb44217c DK |
1863 | // Scan a relocation for stub generation. |
1864 | void | |
1865 | scan_reloc_for_stub(const Relocate_info<32, big_endian>*, unsigned int, | |
1866 | const Sized_symbol<32>*, unsigned int, | |
1867 | const Symbol_value<32>*, | |
1868 | elfcpp::Elf_types<32>::Elf_Swxword, Arm_address); | |
d5b40221 | 1869 | |
eb44217c DK |
1870 | // Scan a relocation section for stub. |
1871 | template<int sh_type> | |
1872 | void | |
1873 | scan_reloc_section_for_stubs( | |
1874 | const Relocate_info<32, big_endian>* relinfo, | |
1875 | const unsigned char* prelocs, | |
1876 | size_t reloc_count, | |
1877 | Output_section* output_section, | |
1878 | bool needs_special_offset_handling, | |
1879 | const unsigned char* view, | |
1880 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
1881 | section_size_type); | |
d5b40221 | 1882 | |
4a657b0d DK |
1883 | // Information about this specific target which we pass to the |
1884 | // general Target structure. | |
1885 | static const Target::Target_info arm_info; | |
94cdfcff DK |
1886 | |
1887 | // The types of GOT entries needed for this platform. | |
1888 | enum Got_type | |
1889 | { | |
1890 | GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol | |
1891 | }; | |
1892 | ||
55da9579 DK |
1893 | typedef typename std::vector<Stub_table<big_endian>*> Stub_table_list; |
1894 | ||
1895 | // Map input section to Arm_input_section. | |
1896 | typedef Unordered_map<Input_section_specifier, | |
1897 | Arm_input_section<big_endian>*, | |
1898 | Input_section_specifier::hash, | |
1899 | Input_section_specifier::equal_to> | |
1900 | Arm_input_section_map; | |
1901 | ||
94cdfcff DK |
1902 | // The GOT section. |
1903 | Output_data_got<32, big_endian>* got_; | |
1904 | // The PLT section. | |
1905 | Output_data_plt_arm<big_endian>* plt_; | |
1906 | // The GOT PLT section. | |
1907 | Output_data_space* got_plt_; | |
1908 | // The dynamic reloc section. | |
1909 | Reloc_section* rel_dyn_; | |
1910 | // Relocs saved to avoid a COPY reloc. | |
1911 | Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_; | |
1912 | // Space for variables copied with a COPY reloc. | |
1913 | Output_data_space* dynbss_; | |
55da9579 DK |
1914 | // Vector of Stub_tables created. |
1915 | Stub_table_list stub_tables_; | |
1916 | // Stub factory. | |
1917 | const Stub_factory &stub_factory_; | |
b569affa DK |
1918 | // Whether we can use BLX. |
1919 | bool may_use_blx_; | |
1920 | // Whether we force PIC branch veneers. | |
1921 | bool should_force_pic_veneer_; | |
eb44217c DK |
1922 | // Map for locating Arm_input_sections. |
1923 | Arm_input_section_map arm_input_section_map_; | |
a0351a69 DK |
1924 | // Attributes section data in output. |
1925 | Attributes_section_data* attributes_section_data_; | |
4a657b0d DK |
1926 | }; |
1927 | ||
1928 | template<bool big_endian> | |
1929 | const Target::Target_info Target_arm<big_endian>::arm_info = | |
1930 | { | |
1931 | 32, // size | |
1932 | big_endian, // is_big_endian | |
1933 | elfcpp::EM_ARM, // machine_code | |
1934 | false, // has_make_symbol | |
1935 | false, // has_resolve | |
1936 | false, // has_code_fill | |
1937 | true, // is_default_stack_executable | |
1938 | '\0', // wrap_char | |
1939 | "/usr/lib/libc.so.1", // dynamic_linker | |
1940 | 0x8000, // default_text_segment_address | |
1941 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
1942 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
1943 | elfcpp::SHN_UNDEF, // small_common_shndx | |
1944 | elfcpp::SHN_UNDEF, // large_common_shndx | |
1945 | 0, // small_common_section_flags | |
05a352e6 DK |
1946 | 0, // large_common_section_flags |
1947 | ".ARM.attributes", // attributes_section | |
1948 | "aeabi" // attributes_vendor | |
4a657b0d DK |
1949 | }; |
1950 | ||
c121c671 DK |
1951 | // Arm relocate functions class |
1952 | // | |
1953 | ||
1954 | template<bool big_endian> | |
1955 | class Arm_relocate_functions : public Relocate_functions<32, big_endian> | |
1956 | { | |
1957 | public: | |
1958 | typedef enum | |
1959 | { | |
1960 | STATUS_OKAY, // No error during relocation. | |
1961 | STATUS_OVERFLOW, // Relocation oveflow. | |
1962 | STATUS_BAD_RELOC // Relocation cannot be applied. | |
1963 | } Status; | |
1964 | ||
1965 | private: | |
1966 | typedef Relocate_functions<32, big_endian> Base; | |
1967 | typedef Arm_relocate_functions<big_endian> This; | |
1968 | ||
fd3c5f0b ILT |
1969 | // Encoding of imm16 argument for movt and movw ARM instructions |
1970 | // from ARM ARM: | |
1971 | // | |
1972 | // imm16 := imm4 | imm12 | |
1973 | // | |
1974 | // 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 | |
1975 | // +-------+---------------+-------+-------+-----------------------+ | |
1976 | // | | |imm4 | |imm12 | | |
1977 | // +-------+---------------+-------+-------+-----------------------+ | |
1978 | ||
1979 | // Extract the relocation addend from VAL based on the ARM | |
1980 | // instruction encoding described above. | |
1981 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1982 | extract_arm_movw_movt_addend( | |
1983 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
1984 | { | |
1985 | // According to the Elf ABI for ARM Architecture the immediate | |
1986 | // field is sign-extended to form the addend. | |
1987 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | (val & 0xfff)); | |
1988 | } | |
1989 | ||
1990 | // Insert X into VAL based on the ARM instruction encoding described | |
1991 | // above. | |
1992 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
1993 | insert_val_arm_movw_movt( | |
1994 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
1995 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
1996 | { | |
1997 | val &= 0xfff0f000; | |
1998 | val |= x & 0x0fff; | |
1999 | val |= (x & 0xf000) << 4; | |
2000 | return val; | |
2001 | } | |
2002 | ||
2003 | // Encoding of imm16 argument for movt and movw Thumb2 instructions | |
2004 | // from ARM ARM: | |
2005 | // | |
2006 | // imm16 := imm4 | i | imm3 | imm8 | |
2007 | // | |
2008 | // 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 | |
2009 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
2010 | // | |i| |imm4 || |imm3 | |imm8 | | |
2011 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
2012 | ||
2013 | // Extract the relocation addend from VAL based on the Thumb2 | |
2014 | // instruction encoding described above. | |
2015 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
2016 | extract_thumb_movw_movt_addend( | |
2017 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
2018 | { | |
2019 | // According to the Elf ABI for ARM Architecture the immediate | |
2020 | // field is sign-extended to form the addend. | |
2021 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | |
2022 | | ((val >> 15) & 0x0800) | |
2023 | | ((val >> 4) & 0x0700) | |
2024 | | (val & 0x00ff)); | |
2025 | } | |
2026 | ||
2027 | // Insert X into VAL based on the Thumb2 instruction encoding | |
2028 | // described above. | |
2029 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
2030 | insert_val_thumb_movw_movt( | |
2031 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
2032 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
2033 | { | |
2034 | val &= 0xfbf08f00; | |
2035 | val |= (x & 0xf000) << 4; | |
2036 | val |= (x & 0x0800) << 15; | |
2037 | val |= (x & 0x0700) << 4; | |
2038 | val |= (x & 0x00ff); | |
2039 | return val; | |
2040 | } | |
2041 | ||
d204b6e9 DK |
2042 | // Handle ARM long branches. |
2043 | static typename This::Status | |
2044 | arm_branch_common(unsigned int, const Relocate_info<32, big_endian>*, | |
2045 | unsigned char *, const Sized_symbol<32>*, | |
2046 | const Arm_relobj<big_endian>*, unsigned int, | |
2047 | const Symbol_value<32>*, Arm_address, Arm_address, bool); | |
c121c671 | 2048 | |
51938283 DK |
2049 | // Handle THUMB long branches. |
2050 | static typename This::Status | |
2051 | thumb_branch_common(unsigned int, const Relocate_info<32, big_endian>*, | |
2052 | unsigned char *, const Sized_symbol<32>*, | |
2053 | const Arm_relobj<big_endian>*, unsigned int, | |
2054 | const Symbol_value<32>*, Arm_address, Arm_address, bool); | |
2055 | ||
c121c671 | 2056 | public: |
5e445df6 | 2057 | |
089d69dc DK |
2058 | // Return the branch offset of a 32-bit THUMB branch. |
2059 | static inline int32_t | |
2060 | thumb32_branch_offset(uint16_t upper_insn, uint16_t lower_insn) | |
2061 | { | |
2062 | // We use the Thumb-2 encoding (backwards compatible with Thumb-1) | |
2063 | // involving the J1 and J2 bits. | |
2064 | uint32_t s = (upper_insn & (1U << 10)) >> 10; | |
2065 | uint32_t upper = upper_insn & 0x3ffU; | |
2066 | uint32_t lower = lower_insn & 0x7ffU; | |
2067 | uint32_t j1 = (lower_insn & (1U << 13)) >> 13; | |
2068 | uint32_t j2 = (lower_insn & (1U << 11)) >> 11; | |
2069 | uint32_t i1 = j1 ^ s ? 0 : 1; | |
2070 | uint32_t i2 = j2 ^ s ? 0 : 1; | |
2071 | ||
2072 | return utils::sign_extend<25>((s << 24) | (i1 << 23) | (i2 << 22) | |
2073 | | (upper << 12) | (lower << 1)); | |
2074 | } | |
2075 | ||
2076 | // Insert OFFSET to a 32-bit THUMB branch and return the upper instruction. | |
2077 | // UPPER_INSN is the original upper instruction of the branch. Caller is | |
2078 | // responsible for overflow checking and BLX offset adjustment. | |
2079 | static inline uint16_t | |
2080 | thumb32_branch_upper(uint16_t upper_insn, int32_t offset) | |
2081 | { | |
2082 | uint32_t s = offset < 0 ? 1 : 0; | |
2083 | uint32_t bits = static_cast<uint32_t>(offset); | |
2084 | return (upper_insn & ~0x7ffU) | ((bits >> 12) & 0x3ffU) | (s << 10); | |
2085 | } | |
2086 | ||
2087 | // Insert OFFSET to a 32-bit THUMB branch and return the lower instruction. | |
2088 | // LOWER_INSN is the original lower instruction of the branch. Caller is | |
2089 | // responsible for overflow checking and BLX offset adjustment. | |
2090 | static inline uint16_t | |
2091 | thumb32_branch_lower(uint16_t lower_insn, int32_t offset) | |
2092 | { | |
2093 | uint32_t s = offset < 0 ? 1 : 0; | |
2094 | uint32_t bits = static_cast<uint32_t>(offset); | |
2095 | return ((lower_insn & ~0x2fffU) | |
2096 | | ((((bits >> 23) & 1) ^ !s) << 13) | |
2097 | | ((((bits >> 22) & 1) ^ !s) << 11) | |
2098 | | ((bits >> 1) & 0x7ffU)); | |
2099 | } | |
2100 | ||
2101 | // Return the branch offset of a 32-bit THUMB conditional branch. | |
2102 | static inline int32_t | |
2103 | thumb32_cond_branch_offset(uint16_t upper_insn, uint16_t lower_insn) | |
2104 | { | |
2105 | uint32_t s = (upper_insn & 0x0400U) >> 10; | |
2106 | uint32_t j1 = (lower_insn & 0x2000U) >> 13; | |
2107 | uint32_t j2 = (lower_insn & 0x0800U) >> 11; | |
2108 | uint32_t lower = (lower_insn & 0x07ffU); | |
2109 | uint32_t upper = (s << 8) | (j2 << 7) | (j1 << 6) | (upper_insn & 0x003fU); | |
2110 | ||
2111 | return utils::sign_extend<21>((upper << 12) | (lower << 1)); | |
2112 | } | |
2113 | ||
2114 | // Insert OFFSET to a 32-bit THUMB conditional branch and return the upper | |
2115 | // instruction. UPPER_INSN is the original upper instruction of the branch. | |
2116 | // Caller is responsible for overflow checking. | |
2117 | static inline uint16_t | |
2118 | thumb32_cond_branch_upper(uint16_t upper_insn, int32_t offset) | |
2119 | { | |
2120 | uint32_t s = offset < 0 ? 1 : 0; | |
2121 | uint32_t bits = static_cast<uint32_t>(offset); | |
2122 | return (upper_insn & 0xfbc0U) | (s << 10) | ((bits & 0x0003f000U) >> 12); | |
2123 | } | |
2124 | ||
2125 | // Insert OFFSET to a 32-bit THUMB conditional branch and return the lower | |
2126 | // instruction. LOWER_INSN is the original lower instruction of the branch. | |
2127 | // Caller is reponsible for overflow checking. | |
2128 | static inline uint16_t | |
2129 | thumb32_cond_branch_lower(uint16_t lower_insn, int32_t offset) | |
2130 | { | |
2131 | uint32_t bits = static_cast<uint32_t>(offset); | |
2132 | uint32_t j2 = (bits & 0x00080000U) >> 19; | |
2133 | uint32_t j1 = (bits & 0x00040000U) >> 18; | |
2134 | uint32_t lo = (bits & 0x00000ffeU) >> 1; | |
2135 | ||
2136 | return (lower_insn & 0xd000U) | (j1 << 13) | (j2 << 11) | lo; | |
2137 | } | |
2138 | ||
5e445df6 ILT |
2139 | // R_ARM_ABS8: S + A |
2140 | static inline typename This::Status | |
2141 | abs8(unsigned char *view, | |
2142 | const Sized_relobj<32, big_endian>* object, | |
be8fcb75 | 2143 | const Symbol_value<32>* psymval) |
5e445df6 ILT |
2144 | { |
2145 | typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype; | |
2146 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2147 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2148 | Valtype val = elfcpp::Swap<8, big_endian>::readval(wv); | |
2149 | Reltype addend = utils::sign_extend<8>(val); | |
2daedcd6 | 2150 | Reltype x = psymval->value(object, addend); |
5e445df6 ILT |
2151 | val = utils::bit_select(val, x, 0xffU); |
2152 | elfcpp::Swap<8, big_endian>::writeval(wv, val); | |
2153 | return (utils::has_signed_unsigned_overflow<8>(x) | |
2154 | ? This::STATUS_OVERFLOW | |
2155 | : This::STATUS_OKAY); | |
2156 | } | |
2157 | ||
be8fcb75 ILT |
2158 | // R_ARM_THM_ABS5: S + A |
2159 | static inline typename This::Status | |
2160 | thm_abs5(unsigned char *view, | |
2161 | const Sized_relobj<32, big_endian>* object, | |
2162 | const Symbol_value<32>* psymval) | |
2163 | { | |
2164 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2165 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2166 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2167 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
2168 | Reltype addend = (val & 0x7e0U) >> 6; | |
2daedcd6 | 2169 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
2170 | val = utils::bit_select(val, x << 6, 0x7e0U); |
2171 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
2172 | return (utils::has_overflow<5>(x) | |
2173 | ? This::STATUS_OVERFLOW | |
2174 | : This::STATUS_OKAY); | |
2175 | } | |
2176 | ||
2177 | // R_ARM_ABS12: S + A | |
2178 | static inline typename This::Status | |
2179 | abs12(unsigned char *view, | |
51938283 DK |
2180 | const Sized_relobj<32, big_endian>* object, |
2181 | const Symbol_value<32>* psymval) | |
be8fcb75 ILT |
2182 | { |
2183 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2184 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2185 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2186 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2187 | Reltype addend = val & 0x0fffU; | |
2daedcd6 | 2188 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
2189 | val = utils::bit_select(val, x, 0x0fffU); |
2190 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2191 | return (utils::has_overflow<12>(x) | |
2192 | ? This::STATUS_OVERFLOW | |
2193 | : This::STATUS_OKAY); | |
2194 | } | |
2195 | ||
2196 | // R_ARM_ABS16: S + A | |
2197 | static inline typename This::Status | |
2198 | abs16(unsigned char *view, | |
51938283 DK |
2199 | const Sized_relobj<32, big_endian>* object, |
2200 | const Symbol_value<32>* psymval) | |
be8fcb75 ILT |
2201 | { |
2202 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2203 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2204 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2205 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
2206 | Reltype addend = utils::sign_extend<16>(val); | |
2daedcd6 | 2207 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
2208 | val = utils::bit_select(val, x, 0xffffU); |
2209 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
2210 | return (utils::has_signed_unsigned_overflow<16>(x) | |
2211 | ? This::STATUS_OVERFLOW | |
2212 | : This::STATUS_OKAY); | |
2213 | } | |
2214 | ||
c121c671 DK |
2215 | // R_ARM_ABS32: (S + A) | T |
2216 | static inline typename This::Status | |
2217 | abs32(unsigned char *view, | |
2218 | const Sized_relobj<32, big_endian>* object, | |
2219 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2220 | Arm_address thumb_bit) |
c121c671 DK |
2221 | { |
2222 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2223 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2224 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
2daedcd6 | 2225 | Valtype x = psymval->value(object, addend) | thumb_bit; |
c121c671 DK |
2226 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
2227 | return This::STATUS_OKAY; | |
2228 | } | |
2229 | ||
2230 | // R_ARM_REL32: (S + A) | T - P | |
2231 | static inline typename This::Status | |
2232 | rel32(unsigned char *view, | |
2233 | const Sized_relobj<32, big_endian>* object, | |
2234 | const Symbol_value<32>* psymval, | |
ebabffbd | 2235 | Arm_address address, |
2daedcd6 | 2236 | Arm_address thumb_bit) |
c121c671 DK |
2237 | { |
2238 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2239 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2240 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
2daedcd6 | 2241 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c121c671 DK |
2242 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
2243 | return This::STATUS_OKAY; | |
2244 | } | |
2245 | ||
2246 | // R_ARM_THM_CALL: (S + A) | T - P | |
2247 | static inline typename This::Status | |
51938283 DK |
2248 | thm_call(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, |
2249 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
2250 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
2251 | Arm_address address, Arm_address thumb_bit, | |
2252 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2253 | { |
51938283 DK |
2254 | return thumb_branch_common(elfcpp::R_ARM_THM_CALL, relinfo, view, gsym, |
2255 | object, r_sym, psymval, address, thumb_bit, | |
2256 | is_weakly_undefined_without_plt); | |
2257 | } | |
c121c671 | 2258 | |
51938283 DK |
2259 | // R_ARM_THM_JUMP24: (S + A) | T - P |
2260 | static inline typename This::Status | |
2261 | thm_jump24(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, | |
2262 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
2263 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
2264 | Arm_address address, Arm_address thumb_bit, | |
2265 | bool is_weakly_undefined_without_plt) | |
2266 | { | |
2267 | return thumb_branch_common(elfcpp::R_ARM_THM_JUMP24, relinfo, view, gsym, | |
2268 | object, r_sym, psymval, address, thumb_bit, | |
2269 | is_weakly_undefined_without_plt); | |
2270 | } | |
2271 | ||
089d69dc DK |
2272 | // R_ARM_THM_JUMP24: (S + A) | T - P |
2273 | static typename This::Status | |
2274 | thm_jump19(unsigned char *view, const Arm_relobj<big_endian>* object, | |
2275 | const Symbol_value<32>* psymval, Arm_address address, | |
2276 | Arm_address thumb_bit); | |
2277 | ||
51938283 DK |
2278 | // R_ARM_THM_XPC22: (S + A) | T - P |
2279 | static inline typename This::Status | |
2280 | thm_xpc22(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, | |
2281 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
2282 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
2283 | Arm_address address, Arm_address thumb_bit, | |
2284 | bool is_weakly_undefined_without_plt) | |
2285 | { | |
2286 | return thumb_branch_common(elfcpp::R_ARM_THM_XPC22, relinfo, view, gsym, | |
2287 | object, r_sym, psymval, address, thumb_bit, | |
2288 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2289 | } |
2290 | ||
2291 | // R_ARM_BASE_PREL: B(S) + A - P | |
2292 | static inline typename This::Status | |
2293 | base_prel(unsigned char* view, | |
ebabffbd DK |
2294 | Arm_address origin, |
2295 | Arm_address address) | |
c121c671 DK |
2296 | { |
2297 | Base::rel32(view, origin - address); | |
2298 | return STATUS_OKAY; | |
2299 | } | |
2300 | ||
be8fcb75 ILT |
2301 | // R_ARM_BASE_ABS: B(S) + A |
2302 | static inline typename This::Status | |
2303 | base_abs(unsigned char* view, | |
f4e5969c | 2304 | Arm_address origin) |
be8fcb75 ILT |
2305 | { |
2306 | Base::rel32(view, origin); | |
2307 | return STATUS_OKAY; | |
2308 | } | |
2309 | ||
c121c671 DK |
2310 | // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG |
2311 | static inline typename This::Status | |
2312 | got_brel(unsigned char* view, | |
2313 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset) | |
2314 | { | |
2315 | Base::rel32(view, got_offset); | |
2316 | return This::STATUS_OKAY; | |
2317 | } | |
2318 | ||
f4e5969c | 2319 | // R_ARM_GOT_PREL: GOT(S) + A - P |
7f5309a5 | 2320 | static inline typename This::Status |
f4e5969c DK |
2321 | got_prel(unsigned char *view, |
2322 | Arm_address got_entry, | |
ebabffbd | 2323 | Arm_address address) |
7f5309a5 | 2324 | { |
f4e5969c | 2325 | Base::rel32(view, got_entry - address); |
7f5309a5 ILT |
2326 | return This::STATUS_OKAY; |
2327 | } | |
2328 | ||
c121c671 DK |
2329 | // R_ARM_PLT32: (S + A) | T - P |
2330 | static inline typename This::Status | |
d204b6e9 DK |
2331 | plt32(const Relocate_info<32, big_endian>* relinfo, |
2332 | unsigned char *view, | |
2333 | const Sized_symbol<32>* gsym, | |
2334 | const Arm_relobj<big_endian>* object, | |
2335 | unsigned int r_sym, | |
c121c671 | 2336 | const Symbol_value<32>* psymval, |
ebabffbd | 2337 | Arm_address address, |
d204b6e9 DK |
2338 | Arm_address thumb_bit, |
2339 | bool is_weakly_undefined_without_plt) | |
2340 | { | |
2341 | return arm_branch_common(elfcpp::R_ARM_PLT32, relinfo, view, gsym, | |
2342 | object, r_sym, psymval, address, thumb_bit, | |
2343 | is_weakly_undefined_without_plt); | |
2344 | } | |
2345 | ||
2346 | // R_ARM_XPC25: (S + A) | T - P | |
2347 | static inline typename This::Status | |
2348 | xpc25(const Relocate_info<32, big_endian>* relinfo, | |
2349 | unsigned char *view, | |
2350 | const Sized_symbol<32>* gsym, | |
2351 | const Arm_relobj<big_endian>* object, | |
2352 | unsigned int r_sym, | |
2353 | const Symbol_value<32>* psymval, | |
2354 | Arm_address address, | |
2355 | Arm_address thumb_bit, | |
2356 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2357 | { |
d204b6e9 DK |
2358 | return arm_branch_common(elfcpp::R_ARM_XPC25, relinfo, view, gsym, |
2359 | object, r_sym, psymval, address, thumb_bit, | |
2360 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2361 | } |
2362 | ||
2363 | // R_ARM_CALL: (S + A) | T - P | |
2364 | static inline typename This::Status | |
d204b6e9 DK |
2365 | call(const Relocate_info<32, big_endian>* relinfo, |
2366 | unsigned char *view, | |
2367 | const Sized_symbol<32>* gsym, | |
2368 | const Arm_relobj<big_endian>* object, | |
2369 | unsigned int r_sym, | |
c121c671 | 2370 | const Symbol_value<32>* psymval, |
ebabffbd | 2371 | Arm_address address, |
d204b6e9 DK |
2372 | Arm_address thumb_bit, |
2373 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2374 | { |
d204b6e9 DK |
2375 | return arm_branch_common(elfcpp::R_ARM_CALL, relinfo, view, gsym, |
2376 | object, r_sym, psymval, address, thumb_bit, | |
2377 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2378 | } |
2379 | ||
2380 | // R_ARM_JUMP24: (S + A) | T - P | |
2381 | static inline typename This::Status | |
d204b6e9 DK |
2382 | jump24(const Relocate_info<32, big_endian>* relinfo, |
2383 | unsigned char *view, | |
2384 | const Sized_symbol<32>* gsym, | |
2385 | const Arm_relobj<big_endian>* object, | |
2386 | unsigned int r_sym, | |
c121c671 | 2387 | const Symbol_value<32>* psymval, |
ebabffbd | 2388 | Arm_address address, |
d204b6e9 DK |
2389 | Arm_address thumb_bit, |
2390 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2391 | { |
d204b6e9 DK |
2392 | return arm_branch_common(elfcpp::R_ARM_JUMP24, relinfo, view, gsym, |
2393 | object, r_sym, psymval, address, thumb_bit, | |
2394 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2395 | } |
2396 | ||
2397 | // R_ARM_PREL: (S + A) | T - P | |
2398 | static inline typename This::Status | |
2399 | prel31(unsigned char *view, | |
2400 | const Sized_relobj<32, big_endian>* object, | |
2401 | const Symbol_value<32>* psymval, | |
ebabffbd | 2402 | Arm_address address, |
2daedcd6 | 2403 | Arm_address thumb_bit) |
c121c671 DK |
2404 | { |
2405 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2406 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2407 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2408 | Valtype addend = utils::sign_extend<31>(val); | |
2daedcd6 | 2409 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c121c671 DK |
2410 | val = utils::bit_select(val, x, 0x7fffffffU); |
2411 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2412 | return (utils::has_overflow<31>(x) ? | |
2413 | This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
2414 | } | |
fd3c5f0b ILT |
2415 | |
2416 | // R_ARM_MOVW_ABS_NC: (S + A) | T | |
2417 | static inline typename This::Status | |
2418 | movw_abs_nc(unsigned char *view, | |
2419 | const Sized_relobj<32, big_endian>* object, | |
2420 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2421 | Arm_address thumb_bit) |
fd3c5f0b ILT |
2422 | { |
2423 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2424 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2425 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2426 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2427 | Valtype x = psymval->value(object, addend) | thumb_bit; |
fd3c5f0b ILT |
2428 | val = This::insert_val_arm_movw_movt(val, x); |
2429 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2430 | return This::STATUS_OKAY; | |
2431 | } | |
2432 | ||
2433 | // R_ARM_MOVT_ABS: S + A | |
2434 | static inline typename This::Status | |
2435 | movt_abs(unsigned char *view, | |
2436 | const Sized_relobj<32, big_endian>* object, | |
2437 | const Symbol_value<32>* psymval) | |
2438 | { | |
2439 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2440 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2441 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2442 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2443 | Valtype x = psymval->value(object, addend) >> 16; |
fd3c5f0b ILT |
2444 | val = This::insert_val_arm_movw_movt(val, x); |
2445 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2446 | return This::STATUS_OKAY; | |
2447 | } | |
2448 | ||
2449 | // R_ARM_THM_MOVW_ABS_NC: S + A | T | |
2450 | static inline typename This::Status | |
2451 | thm_movw_abs_nc(unsigned char *view, | |
2452 | const Sized_relobj<32, big_endian>* object, | |
2453 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2454 | Arm_address thumb_bit) |
fd3c5f0b ILT |
2455 | { |
2456 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2457 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2458 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2459 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2460 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
2461 | Reltype addend = extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2462 | Reltype x = psymval->value(object, addend) | thumb_bit; |
fd3c5f0b ILT |
2463 | val = This::insert_val_thumb_movw_movt(val, x); |
2464 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2465 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2466 | return This::STATUS_OKAY; | |
2467 | } | |
2468 | ||
2469 | // R_ARM_THM_MOVT_ABS: S + A | |
2470 | static inline typename This::Status | |
2471 | thm_movt_abs(unsigned char *view, | |
2472 | const Sized_relobj<32, big_endian>* object, | |
2473 | const Symbol_value<32>* psymval) | |
2474 | { | |
2475 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2476 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2477 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2478 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2479 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
2480 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2481 | Reltype x = psymval->value(object, addend) >> 16; |
fd3c5f0b ILT |
2482 | val = This::insert_val_thumb_movw_movt(val, x); |
2483 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2484 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2485 | return This::STATUS_OKAY; | |
2486 | } | |
2487 | ||
c2a122b6 ILT |
2488 | // R_ARM_MOVW_PREL_NC: (S + A) | T - P |
2489 | static inline typename This::Status | |
2490 | movw_prel_nc(unsigned char *view, | |
2491 | const Sized_relobj<32, big_endian>* object, | |
2492 | const Symbol_value<32>* psymval, | |
ebabffbd | 2493 | Arm_address address, |
2daedcd6 | 2494 | Arm_address thumb_bit) |
c2a122b6 ILT |
2495 | { |
2496 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2497 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2498 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2499 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2500 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c2a122b6 ILT |
2501 | val = This::insert_val_arm_movw_movt(val, x); |
2502 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2503 | return This::STATUS_OKAY; | |
2504 | } | |
2505 | ||
2506 | // R_ARM_MOVT_PREL: S + A - P | |
2507 | static inline typename This::Status | |
2508 | movt_prel(unsigned char *view, | |
2509 | const Sized_relobj<32, big_endian>* object, | |
2510 | const Symbol_value<32>* psymval, | |
ebabffbd | 2511 | Arm_address address) |
c2a122b6 ILT |
2512 | { |
2513 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2514 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2515 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2516 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2517 | Valtype x = (psymval->value(object, addend) - address) >> 16; |
c2a122b6 ILT |
2518 | val = This::insert_val_arm_movw_movt(val, x); |
2519 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2520 | return This::STATUS_OKAY; | |
2521 | } | |
2522 | ||
2523 | // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P | |
2524 | static inline typename This::Status | |
2525 | thm_movw_prel_nc(unsigned char *view, | |
2526 | const Sized_relobj<32, big_endian>* object, | |
2527 | const Symbol_value<32>* psymval, | |
ebabffbd | 2528 | Arm_address address, |
2daedcd6 | 2529 | Arm_address thumb_bit) |
c2a122b6 ILT |
2530 | { |
2531 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2532 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2533 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2534 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2535 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2536 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2537 | Reltype x = (psymval->value(object, addend) | thumb_bit) - address; |
c2a122b6 ILT |
2538 | val = This::insert_val_thumb_movw_movt(val, x); |
2539 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2540 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2541 | return This::STATUS_OKAY; | |
2542 | } | |
2543 | ||
2544 | // R_ARM_THM_MOVT_PREL: S + A - P | |
2545 | static inline typename This::Status | |
2546 | thm_movt_prel(unsigned char *view, | |
2547 | const Sized_relobj<32, big_endian>* object, | |
2548 | const Symbol_value<32>* psymval, | |
ebabffbd | 2549 | Arm_address address) |
c2a122b6 ILT |
2550 | { |
2551 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2552 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2553 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2554 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2555 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2556 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2557 | Reltype x = (psymval->value(object, addend) - address) >> 16; |
c2a122b6 ILT |
2558 | val = This::insert_val_thumb_movw_movt(val, x); |
2559 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2560 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2561 | return This::STATUS_OKAY; | |
2562 | } | |
c121c671 DK |
2563 | }; |
2564 | ||
d204b6e9 DK |
2565 | // Relocate ARM long branches. This handles relocation types |
2566 | // R_ARM_CALL, R_ARM_JUMP24, R_ARM_PLT32 and R_ARM_XPC25. | |
2567 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2568 | // undefined and we do not use PLT in this relocation. In such a case, | |
2569 | // the branch is converted into an NOP. | |
2570 | ||
2571 | template<bool big_endian> | |
2572 | typename Arm_relocate_functions<big_endian>::Status | |
2573 | Arm_relocate_functions<big_endian>::arm_branch_common( | |
2574 | unsigned int r_type, | |
2575 | const Relocate_info<32, big_endian>* relinfo, | |
2576 | unsigned char *view, | |
2577 | const Sized_symbol<32>* gsym, | |
2578 | const Arm_relobj<big_endian>* object, | |
2579 | unsigned int r_sym, | |
2580 | const Symbol_value<32>* psymval, | |
2581 | Arm_address address, | |
2582 | Arm_address thumb_bit, | |
2583 | bool is_weakly_undefined_without_plt) | |
2584 | { | |
2585 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2586 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2587 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2588 | ||
2589 | bool insn_is_b = (((val >> 28) & 0xf) <= 0xe) | |
2590 | && ((val & 0x0f000000UL) == 0x0a000000UL); | |
2591 | bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL; | |
2592 | bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe) | |
2593 | && ((val & 0x0f000000UL) == 0x0b000000UL); | |
2594 | bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL; | |
2595 | bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL; | |
2596 | ||
2597 | // Check that the instruction is valid. | |
2598 | if (r_type == elfcpp::R_ARM_CALL) | |
2599 | { | |
2600 | if (!insn_is_uncond_bl && !insn_is_blx) | |
2601 | return This::STATUS_BAD_RELOC; | |
2602 | } | |
2603 | else if (r_type == elfcpp::R_ARM_JUMP24) | |
2604 | { | |
2605 | if (!insn_is_b && !insn_is_cond_bl) | |
2606 | return This::STATUS_BAD_RELOC; | |
2607 | } | |
2608 | else if (r_type == elfcpp::R_ARM_PLT32) | |
2609 | { | |
2610 | if (!insn_is_any_branch) | |
2611 | return This::STATUS_BAD_RELOC; | |
2612 | } | |
2613 | else if (r_type == elfcpp::R_ARM_XPC25) | |
2614 | { | |
2615 | // FIXME: AAELF document IH0044C does not say much about it other | |
2616 | // than it being obsolete. | |
2617 | if (!insn_is_any_branch) | |
2618 | return This::STATUS_BAD_RELOC; | |
2619 | } | |
2620 | else | |
2621 | gold_unreachable(); | |
2622 | ||
2623 | // A branch to an undefined weak symbol is turned into a jump to | |
2624 | // the next instruction unless a PLT entry will be created. | |
2625 | // Do the same for local undefined symbols. | |
2626 | // The jump to the next instruction is optimized as a NOP depending | |
2627 | // on the architecture. | |
2628 | const Target_arm<big_endian>* arm_target = | |
2629 | Target_arm<big_endian>::default_target(); | |
2630 | if (is_weakly_undefined_without_plt) | |
2631 | { | |
2632 | Valtype cond = val & 0xf0000000U; | |
2633 | if (arm_target->may_use_arm_nop()) | |
2634 | val = cond | 0x0320f000; | |
2635 | else | |
2636 | val = cond | 0x01a00000; // Using pre-UAL nop: mov r0, r0. | |
2637 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2638 | return This::STATUS_OKAY; | |
2639 | } | |
2640 | ||
2641 | Valtype addend = utils::sign_extend<26>(val << 2); | |
2642 | Valtype branch_target = psymval->value(object, addend); | |
2643 | int32_t branch_offset = branch_target - address; | |
2644 | ||
2645 | // We need a stub if the branch offset is too large or if we need | |
2646 | // to switch mode. | |
2647 | bool may_use_blx = arm_target->may_use_blx(); | |
2648 | Reloc_stub* stub = NULL; | |
2649 | if ((branch_offset > ARM_MAX_FWD_BRANCH_OFFSET) | |
2650 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
2651 | || ((thumb_bit != 0) && !(may_use_blx && r_type == elfcpp::R_ARM_CALL))) | |
2652 | { | |
2653 | Stub_type stub_type = | |
2654 | Reloc_stub::stub_type_for_reloc(r_type, address, branch_target, | |
2655 | (thumb_bit != 0)); | |
2656 | if (stub_type != arm_stub_none) | |
2657 | { | |
2ea97941 | 2658 | Stub_table<big_endian>* stub_table = |
d204b6e9 | 2659 | object->stub_table(relinfo->data_shndx); |
2ea97941 | 2660 | gold_assert(stub_table != NULL); |
d204b6e9 DK |
2661 | |
2662 | Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
2ea97941 | 2663 | stub = stub_table->find_reloc_stub(stub_key); |
d204b6e9 DK |
2664 | gold_assert(stub != NULL); |
2665 | thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0; | |
2ea97941 | 2666 | branch_target = stub_table->address() + stub->offset() + addend; |
d204b6e9 DK |
2667 | branch_offset = branch_target - address; |
2668 | gold_assert((branch_offset <= ARM_MAX_FWD_BRANCH_OFFSET) | |
2669 | && (branch_offset >= ARM_MAX_BWD_BRANCH_OFFSET)); | |
2670 | } | |
2671 | } | |
2672 | ||
2673 | // At this point, if we still need to switch mode, the instruction | |
2674 | // must either be a BLX or a BL that can be converted to a BLX. | |
2675 | if (thumb_bit != 0) | |
2676 | { | |
2677 | // Turn BL to BLX. | |
2678 | gold_assert(may_use_blx && r_type == elfcpp::R_ARM_CALL); | |
2679 | val = (val & 0xffffff) | 0xfa000000 | ((branch_offset & 2) << 23); | |
2680 | } | |
2681 | ||
2682 | val = utils::bit_select(val, (branch_offset >> 2), 0xffffffUL); | |
2683 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2684 | return (utils::has_overflow<26>(branch_offset) | |
2685 | ? This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
2686 | } | |
2687 | ||
51938283 DK |
2688 | // Relocate THUMB long branches. This handles relocation types |
2689 | // R_ARM_THM_CALL, R_ARM_THM_JUMP24 and R_ARM_THM_XPC22. | |
2690 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2691 | // undefined and we do not use PLT in this relocation. In such a case, | |
2692 | // the branch is converted into an NOP. | |
2693 | ||
2694 | template<bool big_endian> | |
2695 | typename Arm_relocate_functions<big_endian>::Status | |
2696 | Arm_relocate_functions<big_endian>::thumb_branch_common( | |
2697 | unsigned int r_type, | |
2698 | const Relocate_info<32, big_endian>* relinfo, | |
2699 | unsigned char *view, | |
2700 | const Sized_symbol<32>* gsym, | |
2701 | const Arm_relobj<big_endian>* object, | |
2702 | unsigned int r_sym, | |
2703 | const Symbol_value<32>* psymval, | |
2704 | Arm_address address, | |
2705 | Arm_address thumb_bit, | |
2706 | bool is_weakly_undefined_without_plt) | |
2707 | { | |
2708 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2709 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2710 | uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
2711 | uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2712 | ||
2713 | // FIXME: These tests are too loose and do not take THUMB/THUMB-2 difference | |
2714 | // into account. | |
2715 | bool is_bl_insn = (lower_insn & 0x1000U) == 0x1000U; | |
2716 | bool is_blx_insn = (lower_insn & 0x1000U) == 0x0000U; | |
2717 | ||
2718 | // Check that the instruction is valid. | |
2719 | if (r_type == elfcpp::R_ARM_THM_CALL) | |
2720 | { | |
2721 | if (!is_bl_insn && !is_blx_insn) | |
2722 | return This::STATUS_BAD_RELOC; | |
2723 | } | |
2724 | else if (r_type == elfcpp::R_ARM_THM_JUMP24) | |
2725 | { | |
2726 | // This cannot be a BLX. | |
2727 | if (!is_bl_insn) | |
2728 | return This::STATUS_BAD_RELOC; | |
2729 | } | |
2730 | else if (r_type == elfcpp::R_ARM_THM_XPC22) | |
2731 | { | |
2732 | // Check for Thumb to Thumb call. | |
2733 | if (!is_blx_insn) | |
2734 | return This::STATUS_BAD_RELOC; | |
2735 | if (thumb_bit != 0) | |
2736 | { | |
2737 | gold_warning(_("%s: Thumb BLX instruction targets " | |
2738 | "thumb function '%s'."), | |
2739 | object->name().c_str(), | |
2740 | (gsym ? gsym->name() : "(local)")); | |
2741 | // Convert BLX to BL. | |
2742 | lower_insn |= 0x1000U; | |
2743 | } | |
2744 | } | |
2745 | else | |
2746 | gold_unreachable(); | |
2747 | ||
2748 | // A branch to an undefined weak symbol is turned into a jump to | |
2749 | // the next instruction unless a PLT entry will be created. | |
2750 | // The jump to the next instruction is optimized as a NOP.W for | |
2751 | // Thumb-2 enabled architectures. | |
2752 | const Target_arm<big_endian>* arm_target = | |
2753 | Target_arm<big_endian>::default_target(); | |
2754 | if (is_weakly_undefined_without_plt) | |
2755 | { | |
2756 | if (arm_target->may_use_thumb2_nop()) | |
2757 | { | |
2758 | elfcpp::Swap<16, big_endian>::writeval(wv, 0xf3af); | |
2759 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0x8000); | |
2760 | } | |
2761 | else | |
2762 | { | |
2763 | elfcpp::Swap<16, big_endian>::writeval(wv, 0xe000); | |
2764 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0xbf00); | |
2765 | } | |
2766 | return This::STATUS_OKAY; | |
2767 | } | |
2768 | ||
089d69dc | 2769 | int32_t addend = This::thumb32_branch_offset(upper_insn, lower_insn); |
51938283 DK |
2770 | Arm_address branch_target = psymval->value(object, addend); |
2771 | int32_t branch_offset = branch_target - address; | |
2772 | ||
2773 | // We need a stub if the branch offset is too large or if we need | |
2774 | // to switch mode. | |
2775 | bool may_use_blx = arm_target->may_use_blx(); | |
2776 | bool thumb2 = arm_target->using_thumb2(); | |
2777 | if ((!thumb2 | |
2778 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
2779 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
2780 | || (thumb2 | |
2781 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
2782 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
2783 | || ((thumb_bit == 0) | |
2784 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
2785 | || r_type == elfcpp::R_ARM_THM_JUMP24))) | |
2786 | { | |
2787 | Stub_type stub_type = | |
2788 | Reloc_stub::stub_type_for_reloc(r_type, address, branch_target, | |
2789 | (thumb_bit != 0)); | |
2790 | if (stub_type != arm_stub_none) | |
2791 | { | |
2ea97941 | 2792 | Stub_table<big_endian>* stub_table = |
51938283 | 2793 | object->stub_table(relinfo->data_shndx); |
2ea97941 | 2794 | gold_assert(stub_table != NULL); |
51938283 DK |
2795 | |
2796 | Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
2ea97941 | 2797 | Reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
51938283 DK |
2798 | gold_assert(stub != NULL); |
2799 | thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0; | |
2ea97941 | 2800 | branch_target = stub_table->address() + stub->offset() + addend; |
51938283 DK |
2801 | branch_offset = branch_target - address; |
2802 | } | |
2803 | } | |
2804 | ||
2805 | // At this point, if we still need to switch mode, the instruction | |
2806 | // must either be a BLX or a BL that can be converted to a BLX. | |
2807 | if (thumb_bit == 0) | |
2808 | { | |
2809 | gold_assert(may_use_blx | |
2810 | && (r_type == elfcpp::R_ARM_THM_CALL | |
2811 | || r_type == elfcpp::R_ARM_THM_XPC22)); | |
2812 | // Make sure this is a BLX. | |
2813 | lower_insn &= ~0x1000U; | |
2814 | } | |
2815 | else | |
2816 | { | |
2817 | // Make sure this is a BL. | |
2818 | lower_insn |= 0x1000U; | |
2819 | } | |
2820 | ||
51938283 DK |
2821 | if ((lower_insn & 0x5000U) == 0x4000U) |
2822 | // For a BLX instruction, make sure that the relocation is rounded up | |
2823 | // to a word boundary. This follows the semantics of the instruction | |
2824 | // which specifies that bit 1 of the target address will come from bit | |
2825 | // 1 of the base address. | |
089d69dc | 2826 | branch_offset = (branch_offset + 2) & ~3; |
51938283 DK |
2827 | |
2828 | // Put BRANCH_OFFSET back into the insn. Assumes two's complement. | |
2829 | // We use the Thumb-2 encoding, which is safe even if dealing with | |
2830 | // a Thumb-1 instruction by virtue of our overflow check above. */ | |
089d69dc DK |
2831 | upper_insn = This::thumb32_branch_upper(upper_insn, branch_offset); |
2832 | lower_insn = This::thumb32_branch_lower(lower_insn, branch_offset); | |
51938283 DK |
2833 | |
2834 | elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn); | |
2835 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn); | |
2836 | ||
2837 | return ((thumb2 | |
089d69dc DK |
2838 | ? utils::has_overflow<25>(branch_offset) |
2839 | : utils::has_overflow<23>(branch_offset)) | |
2840 | ? This::STATUS_OVERFLOW | |
2841 | : This::STATUS_OKAY); | |
2842 | } | |
2843 | ||
2844 | // Relocate THUMB-2 long conditional branches. | |
2845 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2846 | // undefined and we do not use PLT in this relocation. In such a case, | |
2847 | // the branch is converted into an NOP. | |
2848 | ||
2849 | template<bool big_endian> | |
2850 | typename Arm_relocate_functions<big_endian>::Status | |
2851 | Arm_relocate_functions<big_endian>::thm_jump19( | |
2852 | unsigned char *view, | |
2853 | const Arm_relobj<big_endian>* object, | |
2854 | const Symbol_value<32>* psymval, | |
2855 | Arm_address address, | |
2856 | Arm_address thumb_bit) | |
2857 | { | |
2858 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2859 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2860 | uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
2861 | uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2862 | int32_t addend = This::thumb32_cond_branch_offset(upper_insn, lower_insn); | |
2863 | ||
2864 | Arm_address branch_target = psymval->value(object, addend); | |
2865 | int32_t branch_offset = branch_target - address; | |
2866 | ||
2867 | // ??? Should handle interworking? GCC might someday try to | |
2868 | // use this for tail calls. | |
2869 | // FIXME: We do support thumb entry to PLT yet. | |
2870 | if (thumb_bit == 0) | |
2871 | { | |
2872 | gold_error(_("conditional branch to PLT in THUMB-2 not supported yet.")); | |
2873 | return This::STATUS_BAD_RELOC; | |
2874 | } | |
2875 | ||
2876 | // Put RELOCATION back into the insn. | |
2877 | upper_insn = This::thumb32_cond_branch_upper(upper_insn, branch_offset); | |
2878 | lower_insn = This::thumb32_cond_branch_lower(lower_insn, branch_offset); | |
2879 | ||
2880 | // Put the relocated value back in the object file: | |
2881 | elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn); | |
2882 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn); | |
2883 | ||
2884 | return (utils::has_overflow<21>(branch_offset) | |
51938283 DK |
2885 | ? This::STATUS_OVERFLOW |
2886 | : This::STATUS_OKAY); | |
2887 | } | |
2888 | ||
94cdfcff DK |
2889 | // Get the GOT section, creating it if necessary. |
2890 | ||
2891 | template<bool big_endian> | |
2892 | Output_data_got<32, big_endian>* | |
2893 | Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout) | |
2894 | { | |
2895 | if (this->got_ == NULL) | |
2896 | { | |
2897 | gold_assert(symtab != NULL && layout != NULL); | |
2898 | ||
2899 | this->got_ = new Output_data_got<32, big_endian>(); | |
2900 | ||
2901 | Output_section* os; | |
2902 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
2903 | (elfcpp::SHF_ALLOC | |
2904 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
2905 | this->got_, false, true, true, |
2906 | false); | |
94cdfcff DK |
2907 | |
2908 | // The old GNU linker creates a .got.plt section. We just | |
2909 | // create another set of data in the .got section. Note that we | |
2910 | // always create a PLT if we create a GOT, although the PLT | |
2911 | // might be empty. | |
2912 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); | |
2913 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
2914 | (elfcpp::SHF_ALLOC | |
2915 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
2916 | this->got_plt_, false, false, |
2917 | false, true); | |
94cdfcff DK |
2918 | |
2919 | // The first three entries are reserved. | |
2920 | this->got_plt_->set_current_data_size(3 * 4); | |
2921 | ||
2922 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
2923 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
99fff23b | 2924 | Symbol_table::PREDEFINED, |
94cdfcff DK |
2925 | this->got_plt_, |
2926 | 0, 0, elfcpp::STT_OBJECT, | |
2927 | elfcpp::STB_LOCAL, | |
2928 | elfcpp::STV_HIDDEN, 0, | |
2929 | false, false); | |
2930 | } | |
2931 | return this->got_; | |
2932 | } | |
2933 | ||
2934 | // Get the dynamic reloc section, creating it if necessary. | |
2935 | ||
2936 | template<bool big_endian> | |
2937 | typename Target_arm<big_endian>::Reloc_section* | |
2938 | Target_arm<big_endian>::rel_dyn_section(Layout* layout) | |
2939 | { | |
2940 | if (this->rel_dyn_ == NULL) | |
2941 | { | |
2942 | gold_assert(layout != NULL); | |
2943 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
2944 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1a2dff53 ILT |
2945 | elfcpp::SHF_ALLOC, this->rel_dyn_, true, |
2946 | false, false, false); | |
94cdfcff DK |
2947 | } |
2948 | return this->rel_dyn_; | |
2949 | } | |
2950 | ||
b569affa DK |
2951 | // Insn_template methods. |
2952 | ||
2953 | // Return byte size of an instruction template. | |
2954 | ||
2955 | size_t | |
2956 | Insn_template::size() const | |
2957 | { | |
2958 | switch (this->type()) | |
2959 | { | |
2960 | case THUMB16_TYPE: | |
2fb7225c | 2961 | case THUMB16_SPECIAL_TYPE: |
b569affa DK |
2962 | return 2; |
2963 | case ARM_TYPE: | |
2964 | case THUMB32_TYPE: | |
2965 | case DATA_TYPE: | |
2966 | return 4; | |
2967 | default: | |
2968 | gold_unreachable(); | |
2969 | } | |
2970 | } | |
2971 | ||
2972 | // Return alignment of an instruction template. | |
2973 | ||
2974 | unsigned | |
2975 | Insn_template::alignment() const | |
2976 | { | |
2977 | switch (this->type()) | |
2978 | { | |
2979 | case THUMB16_TYPE: | |
2fb7225c | 2980 | case THUMB16_SPECIAL_TYPE: |
b569affa DK |
2981 | case THUMB32_TYPE: |
2982 | return 2; | |
2983 | case ARM_TYPE: | |
2984 | case DATA_TYPE: | |
2985 | return 4; | |
2986 | default: | |
2987 | gold_unreachable(); | |
2988 | } | |
2989 | } | |
2990 | ||
2991 | // Stub_template methods. | |
2992 | ||
2993 | Stub_template::Stub_template( | |
2ea97941 ILT |
2994 | Stub_type type, const Insn_template* insns, |
2995 | size_t insn_count) | |
2996 | : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1), | |
b569affa DK |
2997 | entry_in_thumb_mode_(false), relocs_() |
2998 | { | |
2ea97941 | 2999 | off_t offset = 0; |
b569affa DK |
3000 | |
3001 | // Compute byte size and alignment of stub template. | |
2ea97941 | 3002 | for (size_t i = 0; i < insn_count; i++) |
b569affa | 3003 | { |
2ea97941 ILT |
3004 | unsigned insn_alignment = insns[i].alignment(); |
3005 | size_t insn_size = insns[i].size(); | |
3006 | gold_assert((offset & (insn_alignment - 1)) == 0); | |
b569affa | 3007 | this->alignment_ = std::max(this->alignment_, insn_alignment); |
2ea97941 | 3008 | switch (insns[i].type()) |
b569affa DK |
3009 | { |
3010 | case Insn_template::THUMB16_TYPE: | |
089d69dc | 3011 | case Insn_template::THUMB16_SPECIAL_TYPE: |
b569affa DK |
3012 | if (i == 0) |
3013 | this->entry_in_thumb_mode_ = true; | |
3014 | break; | |
3015 | ||
3016 | case Insn_template::THUMB32_TYPE: | |
2ea97941 ILT |
3017 | if (insns[i].r_type() != elfcpp::R_ARM_NONE) |
3018 | this->relocs_.push_back(Reloc(i, offset)); | |
b569affa DK |
3019 | if (i == 0) |
3020 | this->entry_in_thumb_mode_ = true; | |
3021 | break; | |
3022 | ||
3023 | case Insn_template::ARM_TYPE: | |
3024 | // Handle cases where the target is encoded within the | |
3025 | // instruction. | |
2ea97941 ILT |
3026 | if (insns[i].r_type() == elfcpp::R_ARM_JUMP24) |
3027 | this->relocs_.push_back(Reloc(i, offset)); | |
b569affa DK |
3028 | break; |
3029 | ||
3030 | case Insn_template::DATA_TYPE: | |
3031 | // Entry point cannot be data. | |
3032 | gold_assert(i != 0); | |
2ea97941 | 3033 | this->relocs_.push_back(Reloc(i, offset)); |
b569affa DK |
3034 | break; |
3035 | ||
3036 | default: | |
3037 | gold_unreachable(); | |
3038 | } | |
2ea97941 | 3039 | offset += insn_size; |
b569affa | 3040 | } |
2ea97941 | 3041 | this->size_ = offset; |
b569affa DK |
3042 | } |
3043 | ||
bb0d3eb0 DK |
3044 | // Stub methods. |
3045 | ||
3046 | // Template to implement do_write for a specific target endianity. | |
3047 | ||
3048 | template<bool big_endian> | |
3049 | void inline | |
3050 | Stub::do_fixed_endian_write(unsigned char* view, section_size_type view_size) | |
3051 | { | |
3052 | const Stub_template* stub_template = this->stub_template(); | |
3053 | const Insn_template* insns = stub_template->insns(); | |
3054 | ||
3055 | // FIXME: We do not handle BE8 encoding yet. | |
3056 | unsigned char* pov = view; | |
3057 | for (size_t i = 0; i < stub_template->insn_count(); i++) | |
3058 | { | |
3059 | switch (insns[i].type()) | |
3060 | { | |
3061 | case Insn_template::THUMB16_TYPE: | |
3062 | elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff); | |
3063 | break; | |
3064 | case Insn_template::THUMB16_SPECIAL_TYPE: | |
3065 | elfcpp::Swap<16, big_endian>::writeval( | |
3066 | pov, | |
3067 | this->thumb16_special(i)); | |
3068 | break; | |
3069 | case Insn_template::THUMB32_TYPE: | |
3070 | { | |
3071 | uint32_t hi = (insns[i].data() >> 16) & 0xffff; | |
3072 | uint32_t lo = insns[i].data() & 0xffff; | |
3073 | elfcpp::Swap<16, big_endian>::writeval(pov, hi); | |
3074 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo); | |
3075 | } | |
3076 | break; | |
3077 | case Insn_template::ARM_TYPE: | |
3078 | case Insn_template::DATA_TYPE: | |
3079 | elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data()); | |
3080 | break; | |
3081 | default: | |
3082 | gold_unreachable(); | |
3083 | } | |
3084 | pov += insns[i].size(); | |
3085 | } | |
3086 | gold_assert(static_cast<section_size_type>(pov - view) == view_size); | |
3087 | } | |
3088 | ||
b569affa DK |
3089 | // Reloc_stub::Key methods. |
3090 | ||
3091 | // Dump a Key as a string for debugging. | |
3092 | ||
3093 | std::string | |
3094 | Reloc_stub::Key::name() const | |
3095 | { | |
3096 | if (this->r_sym_ == invalid_index) | |
3097 | { | |
3098 | // Global symbol key name | |
3099 | // <stub-type>:<symbol name>:<addend>. | |
3100 | const std::string sym_name = this->u_.symbol->name(); | |
3101 | // We need to print two hex number and two colons. So just add 100 bytes | |
3102 | // to the symbol name size. | |
3103 | size_t len = sym_name.size() + 100; | |
3104 | char* buffer = new char[len]; | |
3105 | int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_, | |
3106 | sym_name.c_str(), this->addend_); | |
3107 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
3108 | delete[] buffer; | |
3109 | return std::string(buffer); | |
3110 | } | |
3111 | else | |
3112 | { | |
3113 | // local symbol key name | |
3114 | // <stub-type>:<object>:<r_sym>:<addend>. | |
3115 | const size_t len = 200; | |
3116 | char buffer[len]; | |
3117 | int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_, | |
3118 | this->u_.relobj, this->r_sym_, this->addend_); | |
3119 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
3120 | return std::string(buffer); | |
3121 | } | |
3122 | } | |
3123 | ||
3124 | // Reloc_stub methods. | |
3125 | ||
3126 | // Determine the type of stub needed, if any, for a relocation of R_TYPE at | |
3127 | // LOCATION to DESTINATION. | |
3128 | // This code is based on the arm_type_of_stub function in | |
3129 | // bfd/elf32-arm.c. We have changed the interface a liitle to keep the Stub | |
3130 | // class simple. | |
3131 | ||
3132 | Stub_type | |
3133 | Reloc_stub::stub_type_for_reloc( | |
3134 | unsigned int r_type, | |
3135 | Arm_address location, | |
3136 | Arm_address destination, | |
3137 | bool target_is_thumb) | |
3138 | { | |
3139 | Stub_type stub_type = arm_stub_none; | |
3140 | ||
3141 | // This is a bit ugly but we want to avoid using a templated class for | |
3142 | // big and little endianities. | |
3143 | bool may_use_blx; | |
3144 | bool should_force_pic_veneer; | |
3145 | bool thumb2; | |
3146 | bool thumb_only; | |
3147 | if (parameters->target().is_big_endian()) | |
3148 | { | |
43d12afe | 3149 | const Target_arm<true>* big_endian_target = |
b569affa | 3150 | Target_arm<true>::default_target(); |
43d12afe DK |
3151 | may_use_blx = big_endian_target->may_use_blx(); |
3152 | should_force_pic_veneer = big_endian_target->should_force_pic_veneer(); | |
3153 | thumb2 = big_endian_target->using_thumb2(); | |
3154 | thumb_only = big_endian_target->using_thumb_only(); | |
b569affa DK |
3155 | } |
3156 | else | |
3157 | { | |
43d12afe | 3158 | const Target_arm<false>* little_endian_target = |
b569affa | 3159 | Target_arm<false>::default_target(); |
43d12afe DK |
3160 | may_use_blx = little_endian_target->may_use_blx(); |
3161 | should_force_pic_veneer = little_endian_target->should_force_pic_veneer(); | |
3162 | thumb2 = little_endian_target->using_thumb2(); | |
3163 | thumb_only = little_endian_target->using_thumb_only(); | |
b569affa DK |
3164 | } |
3165 | ||
3166 | int64_t branch_offset = (int64_t)destination - location; | |
3167 | ||
3168 | if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24) | |
3169 | { | |
3170 | // Handle cases where: | |
3171 | // - this call goes too far (different Thumb/Thumb2 max | |
3172 | // distance) | |
3173 | // - it's a Thumb->Arm call and blx is not available, or it's a | |
3174 | // Thumb->Arm branch (not bl). A stub is needed in this case. | |
3175 | if ((!thumb2 | |
3176 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
3177 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
3178 | || (thumb2 | |
3179 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
3180 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
3181 | || ((!target_is_thumb) | |
3182 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
3183 | || (r_type == elfcpp::R_ARM_THM_JUMP24)))) | |
3184 | { | |
3185 | if (target_is_thumb) | |
3186 | { | |
3187 | // Thumb to thumb. | |
3188 | if (!thumb_only) | |
3189 | { | |
51938283 DK |
3190 | stub_type = (parameters->options().shared() |
3191 | || should_force_pic_veneer) | |
b569affa DK |
3192 | // PIC stubs. |
3193 | ? ((may_use_blx | |
3194 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3195 | // V5T and above. Stub starts with ARM code, so | |
3196 | // we must be able to switch mode before | |
3197 | // reaching it, which is only possible for 'bl' | |
3198 | // (ie R_ARM_THM_CALL relocation). | |
3199 | ? arm_stub_long_branch_any_thumb_pic | |
3200 | // On V4T, use Thumb code only. | |
3201 | : arm_stub_long_branch_v4t_thumb_thumb_pic) | |
3202 | ||
3203 | // non-PIC stubs. | |
3204 | : ((may_use_blx | |
3205 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3206 | ? arm_stub_long_branch_any_any // V5T and above. | |
3207 | : arm_stub_long_branch_v4t_thumb_thumb); // V4T. | |
3208 | } | |
3209 | else | |
3210 | { | |
51938283 DK |
3211 | stub_type = (parameters->options().shared() |
3212 | || should_force_pic_veneer) | |
b569affa DK |
3213 | ? arm_stub_long_branch_thumb_only_pic // PIC stub. |
3214 | : arm_stub_long_branch_thumb_only; // non-PIC stub. | |
3215 | } | |
3216 | } | |
3217 | else | |
3218 | { | |
3219 | // Thumb to arm. | |
3220 | ||
3221 | // FIXME: We should check that the input section is from an | |
3222 | // object that has interwork enabled. | |
3223 | ||
3224 | stub_type = (parameters->options().shared() | |
3225 | || should_force_pic_veneer) | |
3226 | // PIC stubs. | |
3227 | ? ((may_use_blx | |
3228 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3229 | ? arm_stub_long_branch_any_arm_pic // V5T and above. | |
3230 | : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T. | |
3231 | ||
3232 | // non-PIC stubs. | |
3233 | : ((may_use_blx | |
3234 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3235 | ? arm_stub_long_branch_any_any // V5T and above. | |
3236 | : arm_stub_long_branch_v4t_thumb_arm); // V4T. | |
3237 | ||
3238 | // Handle v4t short branches. | |
3239 | if ((stub_type == arm_stub_long_branch_v4t_thumb_arm) | |
3240 | && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET) | |
3241 | && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET)) | |
3242 | stub_type = arm_stub_short_branch_v4t_thumb_arm; | |
3243 | } | |
3244 | } | |
3245 | } | |
3246 | else if (r_type == elfcpp::R_ARM_CALL | |
3247 | || r_type == elfcpp::R_ARM_JUMP24 | |
3248 | || r_type == elfcpp::R_ARM_PLT32) | |
3249 | { | |
3250 | if (target_is_thumb) | |
3251 | { | |
3252 | // Arm to thumb. | |
3253 | ||
3254 | // FIXME: We should check that the input section is from an | |
3255 | // object that has interwork enabled. | |
3256 | ||
3257 | // We have an extra 2-bytes reach because of | |
3258 | // the mode change (bit 24 (H) of BLX encoding). | |
3259 | if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2) | |
3260 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
3261 | || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx) | |
3262 | || (r_type == elfcpp::R_ARM_JUMP24) | |
3263 | || (r_type == elfcpp::R_ARM_PLT32)) | |
3264 | { | |
3265 | stub_type = (parameters->options().shared() | |
3266 | || should_force_pic_veneer) | |
3267 | // PIC stubs. | |
3268 | ? (may_use_blx | |
3269 | ? arm_stub_long_branch_any_thumb_pic// V5T and above. | |
3270 | : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub. | |
3271 | ||
3272 | // non-PIC stubs. | |
3273 | : (may_use_blx | |
3274 | ? arm_stub_long_branch_any_any // V5T and above. | |
3275 | : arm_stub_long_branch_v4t_arm_thumb); // V4T. | |
3276 | } | |
3277 | } | |
3278 | else | |
3279 | { | |
3280 | // Arm to arm. | |
3281 | if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET | |
3282 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)) | |
3283 | { | |
3284 | stub_type = (parameters->options().shared() | |
3285 | || should_force_pic_veneer) | |
3286 | ? arm_stub_long_branch_any_arm_pic // PIC stubs. | |
3287 | : arm_stub_long_branch_any_any; /// non-PIC. | |
3288 | } | |
3289 | } | |
3290 | } | |
3291 | ||
3292 | return stub_type; | |
3293 | } | |
3294 | ||
bb0d3eb0 | 3295 | // Cortex_a8_stub methods. |
b569affa | 3296 | |
bb0d3eb0 DK |
3297 | // Return the instruction for a THUMB16_SPECIAL_TYPE instruction template. |
3298 | // I is the position of the instruction template in the stub template. | |
b569affa | 3299 | |
bb0d3eb0 DK |
3300 | uint16_t |
3301 | Cortex_a8_stub::do_thumb16_special(size_t i) | |
b569affa | 3302 | { |
bb0d3eb0 DK |
3303 | // The only use of this is to copy condition code from a conditional |
3304 | // branch being worked around to the corresponding conditional branch in | |
3305 | // to the stub. | |
3306 | gold_assert(this->stub_template()->type() == arm_stub_a8_veneer_b_cond | |
3307 | && i == 0); | |
3308 | uint16_t data = this->stub_template()->insns()[i].data(); | |
3309 | gold_assert((data & 0xff00U) == 0xd000U); | |
3310 | data |= ((this->original_insn_ >> 22) & 0xf) << 8; | |
3311 | return data; | |
b569affa DK |
3312 | } |
3313 | ||
3314 | // Stub_factory methods. | |
3315 | ||
3316 | Stub_factory::Stub_factory() | |
3317 | { | |
3318 | // The instruction template sequences are declared as static | |
3319 | // objects and initialized first time the constructor runs. | |
3320 | ||
3321 | // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx | |
3322 | // to reach the stub if necessary. | |
3323 | static const Insn_template elf32_arm_stub_long_branch_any_any[] = | |
3324 | { | |
3325 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
3326 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3327 | // dcd R_ARM_ABS32(X) | |
3328 | }; | |
3329 | ||
3330 | // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not | |
3331 | // available. | |
3332 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] = | |
3333 | { | |
3334 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3335 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3336 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3337 | // dcd R_ARM_ABS32(X) | |
3338 | }; | |
3339 | ||
3340 | // Thumb -> Thumb long branch stub. Used on M-profile architectures. | |
3341 | static const Insn_template elf32_arm_stub_long_branch_thumb_only[] = | |
3342 | { | |
3343 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
3344 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
3345 | Insn_template::thumb16_insn(0x4684), // mov ip, r0 | |
3346 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
3347 | Insn_template::thumb16_insn(0x4760), // bx ip | |
3348 | Insn_template::thumb16_insn(0xbf00), // nop | |
3349 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3350 | // dcd R_ARM_ABS32(X) | |
3351 | }; | |
3352 | ||
3353 | // V4T Thumb -> Thumb long branch stub. Using the stack is not | |
3354 | // allowed. | |
3355 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] = | |
3356 | { | |
3357 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3358 | Insn_template::thumb16_insn(0x46c0), // nop | |
3359 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3360 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3361 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3362 | // dcd R_ARM_ABS32(X) | |
3363 | }; | |
3364 | ||
3365 | // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not | |
3366 | // available. | |
3367 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] = | |
3368 | { | |
3369 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3370 | Insn_template::thumb16_insn(0x46c0), // nop | |
3371 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
3372 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3373 | // dcd R_ARM_ABS32(X) | |
3374 | }; | |
3375 | ||
3376 | // V4T Thumb -> ARM short branch stub. Shorter variant of the above | |
3377 | // one, when the destination is close enough. | |
3378 | static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] = | |
3379 | { | |
3380 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3381 | Insn_template::thumb16_insn(0x46c0), // nop | |
3382 | Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8) | |
3383 | }; | |
3384 | ||
3385 | // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use | |
3386 | // blx to reach the stub if necessary. | |
3387 | static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] = | |
3388 | { | |
3389 | Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc] | |
3390 | Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip | |
3391 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
3392 | // dcd R_ARM_REL32(X-4) | |
3393 | }; | |
3394 | ||
3395 | // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use | |
3396 | // blx to reach the stub if necessary. We can not add into pc; | |
3397 | // it is not guaranteed to mode switch (different in ARMv6 and | |
3398 | // ARMv7). | |
3399 | static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] = | |
3400 | { | |
3401 | Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4] | |
3402 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3403 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3404 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3405 | // dcd R_ARM_REL32(X) | |
3406 | }; | |
3407 | ||
3408 | // V4T ARM -> ARM long branch stub, PIC. | |
3409 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] = | |
3410 | { | |
3411 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
3412 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3413 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3414 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3415 | // dcd R_ARM_REL32(X) | |
3416 | }; | |
3417 | ||
3418 | // V4T Thumb -> ARM long branch stub, PIC. | |
3419 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] = | |
3420 | { | |
3421 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3422 | Insn_template::thumb16_insn(0x46c0), // nop | |
3423 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3424 | Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc | |
3425 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
3426 | // dcd R_ARM_REL32(X) | |
3427 | }; | |
3428 | ||
3429 | // Thumb -> Thumb long branch stub, PIC. Used on M-profile | |
3430 | // architectures. | |
3431 | static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] = | |
3432 | { | |
3433 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
3434 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
3435 | Insn_template::thumb16_insn(0x46fc), // mov ip, pc | |
3436 | Insn_template::thumb16_insn(0x4484), // add ip, r0 | |
3437 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
3438 | Insn_template::thumb16_insn(0x4760), // bx ip | |
3439 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4), | |
3440 | // dcd R_ARM_REL32(X) | |
3441 | }; | |
3442 | ||
3443 | // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not | |
3444 | // allowed. | |
3445 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] = | |
3446 | { | |
3447 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3448 | Insn_template::thumb16_insn(0x46c0), // nop | |
3449 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
3450 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3451 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3452 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3453 | // dcd R_ARM_REL32(X) | |
3454 | }; | |
3455 | ||
3456 | // Cortex-A8 erratum-workaround stubs. | |
3457 | ||
3458 | // Stub used for conditional branches (which may be beyond +/-1MB away, | |
3459 | // so we can't use a conditional branch to reach this stub). | |
3460 | ||
3461 | // original code: | |
3462 | // | |
3463 | // b<cond> X | |
3464 | // after: | |
3465 | // | |
3466 | static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] = | |
3467 | { | |
3468 | Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true | |
3469 | Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after | |
3470 | Insn_template::thumb32_b_insn(0xf000b800, -4) // true: | |
3471 | // b.w X | |
3472 | }; | |
3473 | ||
3474 | // Stub used for b.w and bl.w instructions. | |
3475 | ||
3476 | static const Insn_template elf32_arm_stub_a8_veneer_b[] = | |
3477 | { | |
3478 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
3479 | }; | |
3480 | ||
3481 | static const Insn_template elf32_arm_stub_a8_veneer_bl[] = | |
3482 | { | |
3483 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
3484 | }; | |
3485 | ||
3486 | // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w | |
3487 | // instruction (which switches to ARM mode) to point to this stub. Jump to | |
3488 | // the real destination using an ARM-mode branch. | |
bb0d3eb0 | 3489 | static const Insn_template elf32_arm_stub_a8_veneer_blx[] = |
b569affa DK |
3490 | { |
3491 | Insn_template::arm_rel_insn(0xea000000, -8) // b dest | |
3492 | }; | |
3493 | ||
3494 | // Fill in the stub template look-up table. Stub templates are constructed | |
3495 | // per instance of Stub_factory for fast look-up without locking | |
3496 | // in a thread-enabled environment. | |
3497 | ||
3498 | this->stub_templates_[arm_stub_none] = | |
3499 | new Stub_template(arm_stub_none, NULL, 0); | |
3500 | ||
3501 | #define DEF_STUB(x) \ | |
3502 | do \ | |
3503 | { \ | |
3504 | size_t array_size \ | |
3505 | = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \ | |
3506 | Stub_type type = arm_stub_##x; \ | |
3507 | this->stub_templates_[type] = \ | |
3508 | new Stub_template(type, elf32_arm_stub_##x, array_size); \ | |
3509 | } \ | |
3510 | while (0); | |
3511 | ||
3512 | DEF_STUBS | |
3513 | #undef DEF_STUB | |
3514 | } | |
3515 | ||
56ee5e00 DK |
3516 | // Stub_table methods. |
3517 | ||
2fb7225c | 3518 | // Removel all Cortex-A8 stub. |
56ee5e00 DK |
3519 | |
3520 | template<bool big_endian> | |
3521 | void | |
2fb7225c DK |
3522 | Stub_table<big_endian>::remove_all_cortex_a8_stubs() |
3523 | { | |
3524 | for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin(); | |
3525 | p != this->cortex_a8_stubs_.end(); | |
3526 | ++p) | |
3527 | delete p->second; | |
3528 | this->cortex_a8_stubs_.clear(); | |
3529 | } | |
3530 | ||
3531 | // Relocate one stub. This is a helper for Stub_table::relocate_stubs(). | |
3532 | ||
3533 | template<bool big_endian> | |
3534 | void | |
3535 | Stub_table<big_endian>::relocate_stub( | |
3536 | Stub* stub, | |
3537 | const Relocate_info<32, big_endian>* relinfo, | |
3538 | Target_arm<big_endian>* arm_target, | |
3539 | Output_section* output_section, | |
3540 | unsigned char* view, | |
3541 | Arm_address address, | |
3542 | section_size_type view_size) | |
56ee5e00 | 3543 | { |
2ea97941 | 3544 | const Stub_template* stub_template = stub->stub_template(); |
2fb7225c DK |
3545 | if (stub_template->reloc_count() != 0) |
3546 | { | |
3547 | // Adjust view to cover the stub only. | |
3548 | section_size_type offset = stub->offset(); | |
3549 | section_size_type stub_size = stub_template->size(); | |
3550 | gold_assert(offset + stub_size <= view_size); | |
3551 | ||
3552 | arm_target->relocate_stub(stub, relinfo, output_section, view + offset, | |
3553 | address + offset, stub_size); | |
3554 | } | |
56ee5e00 DK |
3555 | } |
3556 | ||
2fb7225c DK |
3557 | // Relocate all stubs in this stub table. |
3558 | ||
56ee5e00 DK |
3559 | template<bool big_endian> |
3560 | void | |
3561 | Stub_table<big_endian>::relocate_stubs( | |
3562 | const Relocate_info<32, big_endian>* relinfo, | |
3563 | Target_arm<big_endian>* arm_target, | |
2ea97941 | 3564 | Output_section* output_section, |
56ee5e00 | 3565 | unsigned char* view, |
2ea97941 | 3566 | Arm_address address, |
56ee5e00 DK |
3567 | section_size_type view_size) |
3568 | { | |
3569 | // If we are passed a view bigger than the stub table's. we need to | |
3570 | // adjust the view. | |
2ea97941 | 3571 | gold_assert(address == this->address() |
56ee5e00 DK |
3572 | && (view_size |
3573 | == static_cast<section_size_type>(this->data_size()))); | |
3574 | ||
2fb7225c DK |
3575 | // Relocate all relocation stubs. |
3576 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3577 | p != this->reloc_stubs_.end(); | |
3578 | ++p) | |
3579 | this->relocate_stub(p->second, relinfo, arm_target, output_section, view, | |
3580 | address, view_size); | |
3581 | ||
3582 | // Relocate all Cortex-A8 stubs. | |
3583 | for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin(); | |
3584 | p != this->cortex_a8_stubs_.end(); | |
3585 | ++p) | |
3586 | this->relocate_stub(p->second, relinfo, arm_target, output_section, view, | |
3587 | address, view_size); | |
3588 | } | |
3589 | ||
3590 | // Write out the stubs to file. | |
3591 | ||
3592 | template<bool big_endian> | |
3593 | void | |
3594 | Stub_table<big_endian>::do_write(Output_file* of) | |
3595 | { | |
3596 | off_t offset = this->offset(); | |
3597 | const section_size_type oview_size = | |
3598 | convert_to_section_size_type(this->data_size()); | |
3599 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
3600 | ||
3601 | // Write relocation stubs. | |
56ee5e00 DK |
3602 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); |
3603 | p != this->reloc_stubs_.end(); | |
3604 | ++p) | |
3605 | { | |
3606 | Reloc_stub* stub = p->second; | |
2fb7225c DK |
3607 | Arm_address address = this->address() + stub->offset(); |
3608 | gold_assert(address | |
3609 | == align_address(address, | |
3610 | stub->stub_template()->alignment())); | |
3611 | stub->write(oview + stub->offset(), stub->stub_template()->size(), | |
3612 | big_endian); | |
56ee5e00 | 3613 | } |
2fb7225c DK |
3614 | |
3615 | // Write Cortex-A8 stubs. | |
3616 | for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin(); | |
3617 | p != this->cortex_a8_stubs_.end(); | |
3618 | ++p) | |
3619 | { | |
3620 | Cortex_a8_stub* stub = p->second; | |
3621 | Arm_address address = this->address() + stub->offset(); | |
3622 | gold_assert(address | |
3623 | == align_address(address, | |
3624 | stub->stub_template()->alignment())); | |
3625 | stub->write(oview + stub->offset(), stub->stub_template()->size(), | |
3626 | big_endian); | |
3627 | } | |
3628 | ||
3629 | of->write_output_view(this->offset(), oview_size, oview); | |
56ee5e00 DK |
3630 | } |
3631 | ||
2fb7225c DK |
3632 | // Update the data size and address alignment of the stub table at the end |
3633 | // of a relaxation pass. Return true if either the data size or the | |
3634 | // alignment changed in this relaxation pass. | |
3635 | ||
3636 | template<bool big_endian> | |
3637 | bool | |
3638 | Stub_table<big_endian>::update_data_size_and_addralign() | |
3639 | { | |
3640 | off_t size = 0; | |
3641 | unsigned addralign = 1; | |
3642 | ||
3643 | // Go over all stubs in table to compute data size and address alignment. | |
3644 | ||
3645 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3646 | p != this->reloc_stubs_.end(); | |
3647 | ++p) | |
3648 | { | |
3649 | const Stub_template* stub_template = p->second->stub_template(); | |
3650 | addralign = std::max(addralign, stub_template->alignment()); | |
3651 | size = (align_address(size, stub_template->alignment()) | |
3652 | + stub_template->size()); | |
3653 | } | |
3654 | ||
3655 | for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin(); | |
3656 | p != this->cortex_a8_stubs_.end(); | |
3657 | ++p) | |
3658 | { | |
3659 | const Stub_template* stub_template = p->second->stub_template(); | |
3660 | addralign = std::max(addralign, stub_template->alignment()); | |
3661 | size = (align_address(size, stub_template->alignment()) | |
3662 | + stub_template->size()); | |
3663 | } | |
3664 | ||
3665 | // Check if either data size or alignment changed in this pass. | |
3666 | // Update prev_data_size_ and prev_addralign_. These will be used | |
3667 | // as the current data size and address alignment for the next pass. | |
3668 | bool changed = size != this->prev_data_size_; | |
3669 | this->prev_data_size_ = size; | |
3670 | ||
3671 | if (addralign != this->prev_addralign_) | |
3672 | changed = true; | |
3673 | this->prev_addralign_ = addralign; | |
3674 | ||
3675 | return changed; | |
3676 | } | |
3677 | ||
3678 | // Finalize the stubs. This sets the offsets of the stubs within the stub | |
3679 | // table. It also marks all input sections needing Cortex-A8 workaround. | |
56ee5e00 DK |
3680 | |
3681 | template<bool big_endian> | |
3682 | void | |
2fb7225c | 3683 | Stub_table<big_endian>::finalize_stubs() |
56ee5e00 DK |
3684 | { |
3685 | off_t off = 0; | |
56ee5e00 DK |
3686 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); |
3687 | p != this->reloc_stubs_.end(); | |
3688 | ++p) | |
3689 | { | |
3690 | Reloc_stub* stub = p->second; | |
2ea97941 ILT |
3691 | const Stub_template* stub_template = stub->stub_template(); |
3692 | uint64_t stub_addralign = stub_template->alignment(); | |
56ee5e00 DK |
3693 | off = align_address(off, stub_addralign); |
3694 | stub->set_offset(off); | |
2ea97941 | 3695 | off += stub_template->size(); |
56ee5e00 DK |
3696 | } |
3697 | ||
2fb7225c DK |
3698 | for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin(); |
3699 | p != this->cortex_a8_stubs_.end(); | |
3700 | ++p) | |
3701 | { | |
3702 | Cortex_a8_stub* stub = p->second; | |
3703 | const Stub_template* stub_template = stub->stub_template(); | |
3704 | uint64_t stub_addralign = stub_template->alignment(); | |
3705 | off = align_address(off, stub_addralign); | |
3706 | stub->set_offset(off); | |
3707 | off += stub_template->size(); | |
3708 | ||
3709 | // Mark input section so that we can determine later if a code section | |
3710 | // needs the Cortex-A8 workaround quickly. | |
3711 | Arm_relobj<big_endian>* arm_relobj = | |
3712 | Arm_relobj<big_endian>::as_arm_relobj(stub->relobj()); | |
3713 | arm_relobj->mark_section_for_cortex_a8_workaround(stub->shndx()); | |
3714 | } | |
3715 | ||
3716 | gold_assert(off <= this->prev_data_size_); | |
56ee5e00 DK |
3717 | } |
3718 | ||
2fb7225c DK |
3719 | // Apply Cortex-A8 workaround to an address range between VIEW_ADDRESS |
3720 | // and VIEW_ADDRESS + VIEW_SIZE - 1. VIEW points to the mapped address | |
3721 | // of the address range seen by the linker. | |
56ee5e00 DK |
3722 | |
3723 | template<bool big_endian> | |
3724 | void | |
2fb7225c DK |
3725 | Stub_table<big_endian>::apply_cortex_a8_workaround_to_address_range( |
3726 | Target_arm<big_endian>* arm_target, | |
3727 | unsigned char* view, | |
3728 | Arm_address view_address, | |
3729 | section_size_type view_size) | |
56ee5e00 | 3730 | { |
2fb7225c DK |
3731 | // Cortex-A8 stubs are sorted by addresses of branches being fixed up. |
3732 | for (Cortex_a8_stub_list::const_iterator p = | |
3733 | this->cortex_a8_stubs_.lower_bound(view_address); | |
3734 | ((p != this->cortex_a8_stubs_.end()) | |
3735 | && (p->first < (view_address + view_size))); | |
3736 | ++p) | |
56ee5e00 | 3737 | { |
2fb7225c DK |
3738 | // We do not store the THUMB bit in the LSB of either the branch address |
3739 | // or the stub offset. There is no need to strip the LSB. | |
3740 | Arm_address branch_address = p->first; | |
3741 | const Cortex_a8_stub* stub = p->second; | |
3742 | Arm_address stub_address = this->address() + stub->offset(); | |
3743 | ||
3744 | // Offset of the branch instruction relative to this view. | |
3745 | section_size_type offset = | |
3746 | convert_to_section_size_type(branch_address - view_address); | |
3747 | gold_assert((offset + 4) <= view_size); | |
3748 | ||
3749 | arm_target->apply_cortex_a8_workaround(stub, stub_address, | |
3750 | view + offset, branch_address); | |
3751 | } | |
56ee5e00 DK |
3752 | } |
3753 | ||
10ad9fe5 DK |
3754 | // Arm_input_section methods. |
3755 | ||
3756 | // Initialize an Arm_input_section. | |
3757 | ||
3758 | template<bool big_endian> | |
3759 | void | |
3760 | Arm_input_section<big_endian>::init() | |
3761 | { | |
2ea97941 ILT |
3762 | Relobj* relobj = this->relobj(); |
3763 | unsigned int shndx = this->shndx(); | |
10ad9fe5 DK |
3764 | |
3765 | // Cache these to speed up size and alignment queries. It is too slow | |
3766 | // to call section_addraglin and section_size every time. | |
2ea97941 ILT |
3767 | this->original_addralign_ = relobj->section_addralign(shndx); |
3768 | this->original_size_ = relobj->section_size(shndx); | |
10ad9fe5 DK |
3769 | |
3770 | // We want to make this look like the original input section after | |
3771 | // output sections are finalized. | |
2ea97941 ILT |
3772 | Output_section* os = relobj->output_section(shndx); |
3773 | off_t offset = relobj->output_section_offset(shndx); | |
3774 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); | |
3775 | this->set_address(os->address() + offset); | |
3776 | this->set_file_offset(os->offset() + offset); | |
10ad9fe5 DK |
3777 | |
3778 | this->set_current_data_size(this->original_size_); | |
3779 | this->finalize_data_size(); | |
3780 | } | |
3781 | ||
3782 | template<bool big_endian> | |
3783 | void | |
3784 | Arm_input_section<big_endian>::do_write(Output_file* of) | |
3785 | { | |
3786 | // We have to write out the original section content. | |
3787 | section_size_type section_size; | |
3788 | const unsigned char* section_contents = | |
3789 | this->relobj()->section_contents(this->shndx(), §ion_size, false); | |
3790 | of->write(this->offset(), section_contents, section_size); | |
3791 | ||
3792 | // If this owns a stub table and it is not empty, write it. | |
3793 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) | |
3794 | this->stub_table_->write(of); | |
3795 | } | |
3796 | ||
3797 | // Finalize data size. | |
3798 | ||
3799 | template<bool big_endian> | |
3800 | void | |
3801 | Arm_input_section<big_endian>::set_final_data_size() | |
3802 | { | |
3803 | // If this owns a stub table, finalize its data size as well. | |
3804 | if (this->is_stub_table_owner()) | |
3805 | { | |
2ea97941 | 3806 | uint64_t address = this->address(); |
10ad9fe5 DK |
3807 | |
3808 | // The stub table comes after the original section contents. | |
2ea97941 ILT |
3809 | address += this->original_size_; |
3810 | address = align_address(address, this->stub_table_->addralign()); | |
3811 | off_t offset = this->offset() + (address - this->address()); | |
3812 | this->stub_table_->set_address_and_file_offset(address, offset); | |
3813 | address += this->stub_table_->data_size(); | |
3814 | gold_assert(address == this->address() + this->current_data_size()); | |
10ad9fe5 DK |
3815 | } |
3816 | ||
3817 | this->set_data_size(this->current_data_size()); | |
3818 | } | |
3819 | ||
3820 | // Reset address and file offset. | |
3821 | ||
3822 | template<bool big_endian> | |
3823 | void | |
3824 | Arm_input_section<big_endian>::do_reset_address_and_file_offset() | |
3825 | { | |
3826 | // Size of the original input section contents. | |
3827 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
3828 | ||
3829 | // If this is a stub table owner, account for the stub table size. | |
3830 | if (this->is_stub_table_owner()) | |
3831 | { | |
2ea97941 | 3832 | Stub_table<big_endian>* stub_table = this->stub_table_; |
10ad9fe5 DK |
3833 | |
3834 | // Reset the stub table's address and file offset. The | |
3835 | // current data size for child will be updated after that. | |
3836 | stub_table_->reset_address_and_file_offset(); | |
3837 | off = align_address(off, stub_table_->addralign()); | |
2ea97941 | 3838 | off += stub_table->current_data_size(); |
10ad9fe5 DK |
3839 | } |
3840 | ||
3841 | this->set_current_data_size(off); | |
3842 | } | |
3843 | ||
07f508a2 DK |
3844 | // Arm_output_section methods. |
3845 | ||
3846 | // Create a stub group for input sections from BEGIN to END. OWNER | |
3847 | // points to the input section to be the owner a new stub table. | |
3848 | ||
3849 | template<bool big_endian> | |
3850 | void | |
3851 | Arm_output_section<big_endian>::create_stub_group( | |
3852 | Input_section_list::const_iterator begin, | |
3853 | Input_section_list::const_iterator end, | |
3854 | Input_section_list::const_iterator owner, | |
3855 | Target_arm<big_endian>* target, | |
3856 | std::vector<Output_relaxed_input_section*>* new_relaxed_sections) | |
3857 | { | |
3858 | // Currently we convert ordinary input sections into relaxed sections only | |
3859 | // at this point but we may want to support creating relaxed input section | |
3860 | // very early. So we check here to see if owner is already a relaxed | |
3861 | // section. | |
3862 | ||
3863 | Arm_input_section<big_endian>* arm_input_section; | |
3864 | if (owner->is_relaxed_input_section()) | |
3865 | { | |
3866 | arm_input_section = | |
3867 | Arm_input_section<big_endian>::as_arm_input_section( | |
3868 | owner->relaxed_input_section()); | |
3869 | } | |
3870 | else | |
3871 | { | |
3872 | gold_assert(owner->is_input_section()); | |
3873 | // Create a new relaxed input section. | |
3874 | arm_input_section = | |
3875 | target->new_arm_input_section(owner->relobj(), owner->shndx()); | |
3876 | new_relaxed_sections->push_back(arm_input_section); | |
3877 | } | |
3878 | ||
3879 | // Create a stub table. | |
2ea97941 | 3880 | Stub_table<big_endian>* stub_table = |
07f508a2 DK |
3881 | target->new_stub_table(arm_input_section); |
3882 | ||
2ea97941 | 3883 | arm_input_section->set_stub_table(stub_table); |
07f508a2 DK |
3884 | |
3885 | Input_section_list::const_iterator p = begin; | |
3886 | Input_section_list::const_iterator prev_p; | |
3887 | ||
3888 | // Look for input sections or relaxed input sections in [begin ... end]. | |
3889 | do | |
3890 | { | |
3891 | if (p->is_input_section() || p->is_relaxed_input_section()) | |
3892 | { | |
3893 | // The stub table information for input sections live | |
3894 | // in their objects. | |
3895 | Arm_relobj<big_endian>* arm_relobj = | |
3896 | Arm_relobj<big_endian>::as_arm_relobj(p->relobj()); | |
2ea97941 | 3897 | arm_relobj->set_stub_table(p->shndx(), stub_table); |
07f508a2 DK |
3898 | } |
3899 | prev_p = p++; | |
3900 | } | |
3901 | while (prev_p != end); | |
3902 | } | |
3903 | ||
3904 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit | |
3905 | // of stub groups. We grow a stub group by adding input section until the | |
3906 | // size is just below GROUP_SIZE. The last input section will be converted | |
3907 | // into a stub table. If STUB_ALWAYS_AFTER_BRANCH is false, we also add | |
3908 | // input section after the stub table, effectively double the group size. | |
3909 | // | |
3910 | // This is similar to the group_sections() function in elf32-arm.c but is | |
3911 | // implemented differently. | |
3912 | ||
3913 | template<bool big_endian> | |
3914 | void | |
3915 | Arm_output_section<big_endian>::group_sections( | |
3916 | section_size_type group_size, | |
3917 | bool stubs_always_after_branch, | |
3918 | Target_arm<big_endian>* target) | |
3919 | { | |
3920 | // We only care about sections containing code. | |
3921 | if ((this->flags() & elfcpp::SHF_EXECINSTR) == 0) | |
3922 | return; | |
3923 | ||
3924 | // States for grouping. | |
3925 | typedef enum | |
3926 | { | |
3927 | // No group is being built. | |
3928 | NO_GROUP, | |
3929 | // A group is being built but the stub table is not found yet. | |
3930 | // We keep group a stub group until the size is just under GROUP_SIZE. | |
3931 | // The last input section in the group will be used as the stub table. | |
3932 | FINDING_STUB_SECTION, | |
3933 | // A group is being built and we have already found a stub table. | |
3934 | // We enter this state to grow a stub group by adding input section | |
3935 | // after the stub table. This effectively doubles the group size. | |
3936 | HAS_STUB_SECTION | |
3937 | } State; | |
3938 | ||
3939 | // Any newly created relaxed sections are stored here. | |
3940 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; | |
3941 | ||
3942 | State state = NO_GROUP; | |
3943 | section_size_type off = 0; | |
3944 | section_size_type group_begin_offset = 0; | |
3945 | section_size_type group_end_offset = 0; | |
3946 | section_size_type stub_table_end_offset = 0; | |
3947 | Input_section_list::const_iterator group_begin = | |
3948 | this->input_sections().end(); | |
2ea97941 | 3949 | Input_section_list::const_iterator stub_table = |
07f508a2 DK |
3950 | this->input_sections().end(); |
3951 | Input_section_list::const_iterator group_end = this->input_sections().end(); | |
3952 | for (Input_section_list::const_iterator p = this->input_sections().begin(); | |
3953 | p != this->input_sections().end(); | |
3954 | ++p) | |
3955 | { | |
3956 | section_size_type section_begin_offset = | |
3957 | align_address(off, p->addralign()); | |
3958 | section_size_type section_end_offset = | |
3959 | section_begin_offset + p->data_size(); | |
3960 | ||
3961 | // Check to see if we should group the previously seens sections. | |
e9bbb538 | 3962 | switch (state) |
07f508a2 DK |
3963 | { |
3964 | case NO_GROUP: | |
3965 | break; | |
3966 | ||
3967 | case FINDING_STUB_SECTION: | |
3968 | // Adding this section makes the group larger than GROUP_SIZE. | |
3969 | if (section_end_offset - group_begin_offset >= group_size) | |
3970 | { | |
3971 | if (stubs_always_after_branch) | |
3972 | { | |
3973 | gold_assert(group_end != this->input_sections().end()); | |
3974 | this->create_stub_group(group_begin, group_end, group_end, | |
3975 | target, &new_relaxed_sections); | |
3976 | state = NO_GROUP; | |
3977 | } | |
3978 | else | |
3979 | { | |
3980 | // But wait, there's more! Input sections up to | |
3981 | // stub_group_size bytes after the stub table can be | |
3982 | // handled by it too. | |
3983 | state = HAS_STUB_SECTION; | |
2ea97941 | 3984 | stub_table = group_end; |
07f508a2 DK |
3985 | stub_table_end_offset = group_end_offset; |
3986 | } | |
3987 | } | |
3988 | break; | |
3989 | ||
3990 | case HAS_STUB_SECTION: | |
3991 | // Adding this section makes the post stub-section group larger | |
3992 | // than GROUP_SIZE. | |
3993 | if (section_end_offset - stub_table_end_offset >= group_size) | |
3994 | { | |
3995 | gold_assert(group_end != this->input_sections().end()); | |
2ea97941 | 3996 | this->create_stub_group(group_begin, group_end, stub_table, |
07f508a2 DK |
3997 | target, &new_relaxed_sections); |
3998 | state = NO_GROUP; | |
3999 | } | |
4000 | break; | |
4001 | ||
4002 | default: | |
4003 | gold_unreachable(); | |
4004 | } | |
4005 | ||
4006 | // If we see an input section and currently there is no group, start | |
4007 | // a new one. Skip any empty sections. | |
4008 | if ((p->is_input_section() || p->is_relaxed_input_section()) | |
4009 | && (p->relobj()->section_size(p->shndx()) != 0)) | |
4010 | { | |
4011 | if (state == NO_GROUP) | |
4012 | { | |
4013 | state = FINDING_STUB_SECTION; | |
4014 | group_begin = p; | |
4015 | group_begin_offset = section_begin_offset; | |
4016 | } | |
4017 | ||
4018 | // Keep track of the last input section seen. | |
4019 | group_end = p; | |
4020 | group_end_offset = section_end_offset; | |
4021 | } | |
4022 | ||
4023 | off = section_end_offset; | |
4024 | } | |
4025 | ||
4026 | // Create a stub group for any ungrouped sections. | |
4027 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) | |
4028 | { | |
4029 | gold_assert(group_end != this->input_sections().end()); | |
4030 | this->create_stub_group(group_begin, group_end, | |
4031 | (state == FINDING_STUB_SECTION | |
4032 | ? group_end | |
2ea97941 | 4033 | : stub_table), |
07f508a2 DK |
4034 | target, &new_relaxed_sections); |
4035 | } | |
4036 | ||
4037 | // Convert input section into relaxed input section in a batch. | |
4038 | if (!new_relaxed_sections.empty()) | |
4039 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); | |
4040 | ||
4041 | // Update the section offsets | |
4042 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) | |
4043 | { | |
4044 | Arm_relobj<big_endian>* arm_relobj = | |
4045 | Arm_relobj<big_endian>::as_arm_relobj( | |
4046 | new_relaxed_sections[i]->relobj()); | |
2ea97941 | 4047 | unsigned int shndx = new_relaxed_sections[i]->shndx(); |
07f508a2 | 4048 | // Tell Arm_relobj that this input section is converted. |
2ea97941 | 4049 | arm_relobj->convert_input_section_to_relaxed_section(shndx); |
07f508a2 DK |
4050 | } |
4051 | } | |
4052 | ||
8ffa3667 DK |
4053 | // Arm_relobj methods. |
4054 | ||
4055 | // Scan relocations for stub generation. | |
4056 | ||
4057 | template<bool big_endian> | |
4058 | void | |
4059 | Arm_relobj<big_endian>::scan_sections_for_stubs( | |
4060 | Target_arm<big_endian>* arm_target, | |
4061 | const Symbol_table* symtab, | |
2ea97941 | 4062 | const Layout* layout) |
8ffa3667 | 4063 | { |
2ea97941 ILT |
4064 | unsigned int shnum = this->shnum(); |
4065 | const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
8ffa3667 DK |
4066 | |
4067 | // Read the section headers. | |
4068 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
2ea97941 | 4069 | shnum * shdr_size, |
8ffa3667 DK |
4070 | true, true); |
4071 | ||
4072 | // To speed up processing, we set up hash tables for fast lookup of | |
4073 | // input offsets to output addresses. | |
4074 | this->initialize_input_to_output_maps(); | |
4075 | ||
4076 | const Relobj::Output_sections& out_sections(this->output_sections()); | |
4077 | ||
4078 | Relocate_info<32, big_endian> relinfo; | |
8ffa3667 | 4079 | relinfo.symtab = symtab; |
2ea97941 | 4080 | relinfo.layout = layout; |
8ffa3667 DK |
4081 | relinfo.object = this; |
4082 | ||
2ea97941 ILT |
4083 | const unsigned char* p = pshdrs + shdr_size; |
4084 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
8ffa3667 DK |
4085 | { |
4086 | typename elfcpp::Shdr<32, big_endian> shdr(p); | |
4087 | ||
4088 | unsigned int sh_type = shdr.get_sh_type(); | |
4089 | if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA) | |
4090 | continue; | |
4091 | ||
4092 | off_t sh_size = shdr.get_sh_size(); | |
4093 | if (sh_size == 0) | |
4094 | continue; | |
4095 | ||
4096 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); | |
4097 | if (index >= this->shnum()) | |
4098 | { | |
4099 | // Ignore reloc section with bad info. This error will be | |
4100 | // reported in the final link. | |
4101 | continue; | |
4102 | } | |
4103 | ||
4104 | Output_section* os = out_sections[index]; | |
d6344fb5 DK |
4105 | if (os == NULL |
4106 | || symtab->is_section_folded(this, index)) | |
8ffa3667 DK |
4107 | { |
4108 | // This relocation section is against a section which we | |
d6344fb5 DK |
4109 | // discarded or if the section is folded into another |
4110 | // section due to ICF. | |
8ffa3667 DK |
4111 | continue; |
4112 | } | |
4113 | Arm_address output_offset = this->get_output_section_offset(index); | |
4114 | ||
4115 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) | |
4116 | { | |
4117 | // Ignore reloc section with unexpected symbol table. The | |
4118 | // error will be reported in the final link. | |
4119 | continue; | |
4120 | } | |
4121 | ||
4122 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), | |
4123 | sh_size, true, false); | |
4124 | ||
4125 | unsigned int reloc_size; | |
4126 | if (sh_type == elfcpp::SHT_REL) | |
4127 | reloc_size = elfcpp::Elf_sizes<32>::rel_size; | |
4128 | else | |
4129 | reloc_size = elfcpp::Elf_sizes<32>::rela_size; | |
4130 | ||
4131 | if (reloc_size != shdr.get_sh_entsize()) | |
4132 | { | |
4133 | // Ignore reloc section with unexpected entsize. The error | |
4134 | // will be reported in the final link. | |
4135 | continue; | |
4136 | } | |
4137 | ||
4138 | size_t reloc_count = sh_size / reloc_size; | |
4139 | if (static_cast<off_t>(reloc_count * reloc_size) != sh_size) | |
4140 | { | |
4141 | // Ignore reloc section with uneven size. The error will be | |
4142 | // reported in the final link. | |
4143 | continue; | |
4144 | } | |
4145 | ||
4146 | gold_assert(output_offset != invalid_address | |
4147 | || this->relocs_must_follow_section_writes()); | |
4148 | ||
4149 | // Get the section contents. This does work for the case in which | |
4150 | // we modify the contents of an input section. We need to pass the | |
4151 | // output view under such circumstances. | |
4152 | section_size_type input_view_size = 0; | |
4153 | const unsigned char* input_view = | |
4154 | this->section_contents(index, &input_view_size, false); | |
4155 | ||
4156 | relinfo.reloc_shndx = i; | |
4157 | relinfo.data_shndx = index; | |
4158 | arm_target->scan_section_for_stubs(&relinfo, sh_type, prelocs, | |
4159 | reloc_count, os, | |
4160 | output_offset == invalid_address, | |
4161 | input_view, | |
4162 | os->address(), | |
4163 | input_view_size); | |
4164 | } | |
4165 | ||
4166 | // After we've done the relocations, we release the hash tables, | |
4167 | // since we no longer need them. | |
4168 | this->free_input_to_output_maps(); | |
4169 | } | |
4170 | ||
4171 | // Count the local symbols. The ARM backend needs to know if a symbol | |
4172 | // is a THUMB function or not. For global symbols, it is easy because | |
4173 | // the Symbol object keeps the ELF symbol type. For local symbol it is | |
4174 | // harder because we cannot access this information. So we override the | |
4175 | // do_count_local_symbol in parent and scan local symbols to mark | |
4176 | // THUMB functions. This is not the most efficient way but I do not want to | |
4177 | // slow down other ports by calling a per symbol targer hook inside | |
4178 | // Sized_relobj<size, big_endian>::do_count_local_symbols. | |
4179 | ||
4180 | template<bool big_endian> | |
4181 | void | |
4182 | Arm_relobj<big_endian>::do_count_local_symbols( | |
4183 | Stringpool_template<char>* pool, | |
4184 | Stringpool_template<char>* dynpool) | |
4185 | { | |
4186 | // We need to fix-up the values of any local symbols whose type are | |
4187 | // STT_ARM_TFUNC. | |
4188 | ||
4189 | // Ask parent to count the local symbols. | |
4190 | Sized_relobj<32, big_endian>::do_count_local_symbols(pool, dynpool); | |
4191 | const unsigned int loccount = this->local_symbol_count(); | |
4192 | if (loccount == 0) | |
4193 | return; | |
4194 | ||
4195 | // Intialize the thumb function bit-vector. | |
4196 | std::vector<bool> empty_vector(loccount, false); | |
4197 | this->local_symbol_is_thumb_function_.swap(empty_vector); | |
4198 | ||
4199 | // Read the symbol table section header. | |
2ea97941 | 4200 | const unsigned int symtab_shndx = this->symtab_shndx(); |
8ffa3667 | 4201 | elfcpp::Shdr<32, big_endian> |
2ea97941 | 4202 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); |
8ffa3667 DK |
4203 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
4204 | ||
4205 | // Read the local symbols. | |
2ea97941 | 4206 | const int sym_size =elfcpp::Elf_sizes<32>::sym_size; |
8ffa3667 | 4207 | gold_assert(loccount == symtabshdr.get_sh_info()); |
2ea97941 | 4208 | off_t locsize = loccount * sym_size; |
8ffa3667 DK |
4209 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
4210 | locsize, true, true); | |
4211 | ||
4212 | // Loop over the local symbols and mark any local symbols pointing | |
4213 | // to THUMB functions. | |
4214 | ||
4215 | // Skip the first dummy symbol. | |
2ea97941 | 4216 | psyms += sym_size; |
8ffa3667 DK |
4217 | typename Sized_relobj<32, big_endian>::Local_values* plocal_values = |
4218 | this->local_values(); | |
2ea97941 | 4219 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
8ffa3667 DK |
4220 | { |
4221 | elfcpp::Sym<32, big_endian> sym(psyms); | |
4222 | elfcpp::STT st_type = sym.get_st_type(); | |
4223 | Symbol_value<32>& lv((*plocal_values)[i]); | |
4224 | Arm_address input_value = lv.input_value(); | |
4225 | ||
4226 | if (st_type == elfcpp::STT_ARM_TFUNC | |
4227 | || (st_type == elfcpp::STT_FUNC && ((input_value & 1) != 0))) | |
4228 | { | |
4229 | // This is a THUMB function. Mark this and canonicalize the | |
4230 | // symbol value by setting LSB. | |
4231 | this->local_symbol_is_thumb_function_[i] = true; | |
4232 | if ((input_value & 1) == 0) | |
4233 | lv.set_input_value(input_value | 1); | |
4234 | } | |
4235 | } | |
4236 | } | |
4237 | ||
4238 | // Relocate sections. | |
4239 | template<bool big_endian> | |
4240 | void | |
4241 | Arm_relobj<big_endian>::do_relocate_sections( | |
8ffa3667 | 4242 | const Symbol_table* symtab, |
2ea97941 | 4243 | const Layout* layout, |
8ffa3667 DK |
4244 | const unsigned char* pshdrs, |
4245 | typename Sized_relobj<32, big_endian>::Views* pviews) | |
4246 | { | |
4247 | // Call parent to relocate sections. | |
2ea97941 | 4248 | Sized_relobj<32, big_endian>::do_relocate_sections(symtab, layout, pshdrs, |
43d12afe | 4249 | pviews); |
8ffa3667 DK |
4250 | |
4251 | // We do not generate stubs if doing a relocatable link. | |
4252 | if (parameters->options().relocatable()) | |
4253 | return; | |
4254 | ||
4255 | // Relocate stub tables. | |
2ea97941 | 4256 | unsigned int shnum = this->shnum(); |
8ffa3667 DK |
4257 | |
4258 | Target_arm<big_endian>* arm_target = | |
4259 | Target_arm<big_endian>::default_target(); | |
4260 | ||
4261 | Relocate_info<32, big_endian> relinfo; | |
8ffa3667 | 4262 | relinfo.symtab = symtab; |
2ea97941 | 4263 | relinfo.layout = layout; |
8ffa3667 DK |
4264 | relinfo.object = this; |
4265 | ||
2ea97941 | 4266 | for (unsigned int i = 1; i < shnum; ++i) |
8ffa3667 DK |
4267 | { |
4268 | Arm_input_section<big_endian>* arm_input_section = | |
4269 | arm_target->find_arm_input_section(this, i); | |
4270 | ||
4271 | if (arm_input_section == NULL | |
4272 | || !arm_input_section->is_stub_table_owner() | |
4273 | || arm_input_section->stub_table()->empty()) | |
4274 | continue; | |
4275 | ||
4276 | // We cannot discard a section if it owns a stub table. | |
4277 | Output_section* os = this->output_section(i); | |
4278 | gold_assert(os != NULL); | |
4279 | ||
4280 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; | |
4281 | relinfo.reloc_shdr = NULL; | |
4282 | relinfo.data_shndx = i; | |
4283 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<32>::shdr_size; | |
4284 | ||
4285 | gold_assert((*pviews)[i].view != NULL); | |
4286 | ||
4287 | // We are passed the output section view. Adjust it to cover the | |
4288 | // stub table only. | |
2ea97941 ILT |
4289 | Stub_table<big_endian>* stub_table = arm_input_section->stub_table(); |
4290 | gold_assert((stub_table->address() >= (*pviews)[i].address) | |
4291 | && ((stub_table->address() + stub_table->data_size()) | |
8ffa3667 DK |
4292 | <= (*pviews)[i].address + (*pviews)[i].view_size)); |
4293 | ||
2ea97941 ILT |
4294 | off_t offset = stub_table->address() - (*pviews)[i].address; |
4295 | unsigned char* view = (*pviews)[i].view + offset; | |
4296 | Arm_address address = stub_table->address(); | |
4297 | section_size_type view_size = stub_table->data_size(); | |
8ffa3667 | 4298 | |
2ea97941 ILT |
4299 | stub_table->relocate_stubs(&relinfo, arm_target, os, view, address, |
4300 | view_size); | |
8ffa3667 DK |
4301 | } |
4302 | } | |
4303 | ||
a0351a69 DK |
4304 | // Helper functions for both Arm_relobj and Arm_dynobj to read ARM |
4305 | // ABI information. | |
4306 | ||
4307 | template<bool big_endian> | |
4308 | Attributes_section_data* | |
4309 | read_arm_attributes_section( | |
4310 | Object* object, | |
4311 | Read_symbols_data *sd) | |
4312 | { | |
4313 | // Read the attributes section if there is one. | |
4314 | // We read from the end because gas seems to put it near the end of | |
4315 | // the section headers. | |
4316 | const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
4317 | const unsigned char *ps = | |
4318 | sd->section_headers->data() + shdr_size * (object->shnum() - 1); | |
4319 | for (unsigned int i = object->shnum(); i > 0; --i, ps -= shdr_size) | |
4320 | { | |
4321 | elfcpp::Shdr<32, big_endian> shdr(ps); | |
4322 | if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES) | |
4323 | { | |
4324 | section_offset_type section_offset = shdr.get_sh_offset(); | |
4325 | section_size_type section_size = | |
4326 | convert_to_section_size_type(shdr.get_sh_size()); | |
4327 | File_view* view = object->get_lasting_view(section_offset, | |
4328 | section_size, true, false); | |
4329 | return new Attributes_section_data(view->data(), section_size); | |
4330 | } | |
4331 | } | |
4332 | return NULL; | |
4333 | } | |
4334 | ||
d5b40221 DK |
4335 | // Read the symbol information. |
4336 | ||
4337 | template<bool big_endian> | |
4338 | void | |
4339 | Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) | |
4340 | { | |
4341 | // Call parent class to read symbol information. | |
4342 | Sized_relobj<32, big_endian>::do_read_symbols(sd); | |
4343 | ||
4344 | // Read processor-specific flags in ELF file header. | |
4345 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
4346 | elfcpp::Elf_sizes<32>::ehdr_size, | |
4347 | true, false); | |
4348 | elfcpp::Ehdr<32, big_endian> ehdr(pehdr); | |
4349 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
a0351a69 DK |
4350 | this->attributes_section_data_ = |
4351 | read_arm_attributes_section<big_endian>(this, sd); | |
d5b40221 DK |
4352 | } |
4353 | ||
99e5bff2 DK |
4354 | // Process relocations for garbage collection. The ARM target uses .ARM.exidx |
4355 | // sections for unwinding. These sections are referenced implicitly by | |
4356 | // text sections linked in the section headers. If we ignore these implict | |
4357 | // references, the .ARM.exidx sections and any .ARM.extab sections they use | |
4358 | // will be garbage-collected incorrectly. Hence we override the same function | |
4359 | // in the base class to handle these implicit references. | |
4360 | ||
4361 | template<bool big_endian> | |
4362 | void | |
4363 | Arm_relobj<big_endian>::do_gc_process_relocs(Symbol_table* symtab, | |
4364 | Layout* layout, | |
4365 | Read_relocs_data* rd) | |
4366 | { | |
4367 | // First, call base class method to process relocations in this object. | |
4368 | Sized_relobj<32, big_endian>::do_gc_process_relocs(symtab, layout, rd); | |
4369 | ||
4370 | unsigned int shnum = this->shnum(); | |
4371 | const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
4372 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
4373 | shnum * shdr_size, | |
4374 | true, true); | |
4375 | ||
4376 | // Scan section headers for sections of type SHT_ARM_EXIDX. Add references | |
4377 | // to these from the linked text sections. | |
4378 | const unsigned char* ps = pshdrs + shdr_size; | |
4379 | for (unsigned int i = 1; i < shnum; ++i, ps += shdr_size) | |
4380 | { | |
4381 | elfcpp::Shdr<32, big_endian> shdr(ps); | |
4382 | if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX) | |
4383 | { | |
4384 | // Found an .ARM.exidx section, add it to the set of reachable | |
4385 | // sections from its linked text section. | |
4386 | unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link()); | |
4387 | symtab->gc()->add_reference(this, text_shndx, this, i); | |
4388 | } | |
4389 | } | |
4390 | } | |
4391 | ||
d5b40221 DK |
4392 | // Arm_dynobj methods. |
4393 | ||
4394 | // Read the symbol information. | |
4395 | ||
4396 | template<bool big_endian> | |
4397 | void | |
4398 | Arm_dynobj<big_endian>::do_read_symbols(Read_symbols_data* sd) | |
4399 | { | |
4400 | // Call parent class to read symbol information. | |
4401 | Sized_dynobj<32, big_endian>::do_read_symbols(sd); | |
4402 | ||
4403 | // Read processor-specific flags in ELF file header. | |
4404 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
4405 | elfcpp::Elf_sizes<32>::ehdr_size, | |
4406 | true, false); | |
4407 | elfcpp::Ehdr<32, big_endian> ehdr(pehdr); | |
4408 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
a0351a69 DK |
4409 | this->attributes_section_data_ = |
4410 | read_arm_attributes_section<big_endian>(this, sd); | |
d5b40221 DK |
4411 | } |
4412 | ||
e9bbb538 DK |
4413 | // Stub_addend_reader methods. |
4414 | ||
4415 | // Read the addend of a REL relocation of type R_TYPE at VIEW. | |
4416 | ||
4417 | template<bool big_endian> | |
4418 | elfcpp::Elf_types<32>::Elf_Swxword | |
4419 | Stub_addend_reader<elfcpp::SHT_REL, big_endian>::operator()( | |
4420 | unsigned int r_type, | |
4421 | const unsigned char* view, | |
4422 | const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const | |
4423 | { | |
089d69dc DK |
4424 | typedef struct Arm_relocate_functions<big_endian> RelocFuncs; |
4425 | ||
e9bbb538 DK |
4426 | switch (r_type) |
4427 | { | |
4428 | case elfcpp::R_ARM_CALL: | |
4429 | case elfcpp::R_ARM_JUMP24: | |
4430 | case elfcpp::R_ARM_PLT32: | |
4431 | { | |
4432 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
4433 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
4434 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4435 | return utils::sign_extend<26>(val << 2); | |
4436 | } | |
4437 | ||
4438 | case elfcpp::R_ARM_THM_CALL: | |
4439 | case elfcpp::R_ARM_THM_JUMP24: | |
4440 | case elfcpp::R_ARM_THM_XPC22: | |
4441 | { | |
e9bbb538 DK |
4442 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; |
4443 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
4444 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
4445 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
089d69dc | 4446 | return RelocFuncs::thumb32_branch_offset(upper_insn, lower_insn); |
e9bbb538 DK |
4447 | } |
4448 | ||
4449 | case elfcpp::R_ARM_THM_JUMP19: | |
4450 | { | |
4451 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
4452 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
4453 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
4454 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
089d69dc | 4455 | return RelocFuncs::thumb32_cond_branch_offset(upper_insn, lower_insn); |
e9bbb538 DK |
4456 | } |
4457 | ||
4458 | default: | |
4459 | gold_unreachable(); | |
4460 | } | |
4461 | } | |
4462 | ||
94cdfcff DK |
4463 | // A class to handle the PLT data. |
4464 | ||
4465 | template<bool big_endian> | |
4466 | class Output_data_plt_arm : public Output_section_data | |
4467 | { | |
4468 | public: | |
4469 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
4470 | Reloc_section; | |
4471 | ||
4472 | Output_data_plt_arm(Layout*, Output_data_space*); | |
4473 | ||
4474 | // Add an entry to the PLT. | |
4475 | void | |
4476 | add_entry(Symbol* gsym); | |
4477 | ||
4478 | // Return the .rel.plt section data. | |
4479 | const Reloc_section* | |
4480 | rel_plt() const | |
4481 | { return this->rel_; } | |
4482 | ||
4483 | protected: | |
4484 | void | |
4485 | do_adjust_output_section(Output_section* os); | |
4486 | ||
4487 | // Write to a map file. | |
4488 | void | |
4489 | do_print_to_mapfile(Mapfile* mapfile) const | |
4490 | { mapfile->print_output_data(this, _("** PLT")); } | |
4491 | ||
4492 | private: | |
4493 | // Template for the first PLT entry. | |
4494 | static const uint32_t first_plt_entry[5]; | |
4495 | ||
4496 | // Template for subsequent PLT entries. | |
4497 | static const uint32_t plt_entry[3]; | |
4498 | ||
4499 | // Set the final size. | |
4500 | void | |
4501 | set_final_data_size() | |
4502 | { | |
4503 | this->set_data_size(sizeof(first_plt_entry) | |
4504 | + this->count_ * sizeof(plt_entry)); | |
4505 | } | |
4506 | ||
4507 | // Write out the PLT data. | |
4508 | void | |
4509 | do_write(Output_file*); | |
4510 | ||
4511 | // The reloc section. | |
4512 | Reloc_section* rel_; | |
4513 | // The .got.plt section. | |
4514 | Output_data_space* got_plt_; | |
4515 | // The number of PLT entries. | |
4516 | unsigned int count_; | |
4517 | }; | |
4518 | ||
4519 | // Create the PLT section. The ordinary .got section is an argument, | |
4520 | // since we need to refer to the start. We also create our own .got | |
4521 | // section just for PLT entries. | |
4522 | ||
4523 | template<bool big_endian> | |
2ea97941 | 4524 | Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout, |
94cdfcff DK |
4525 | Output_data_space* got_plt) |
4526 | : Output_section_data(4), got_plt_(got_plt), count_(0) | |
4527 | { | |
4528 | this->rel_ = new Reloc_section(false); | |
2ea97941 | 4529 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
1a2dff53 ILT |
4530 | elfcpp::SHF_ALLOC, this->rel_, true, false, |
4531 | false, false); | |
94cdfcff DK |
4532 | } |
4533 | ||
4534 | template<bool big_endian> | |
4535 | void | |
4536 | Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os) | |
4537 | { | |
4538 | os->set_entsize(0); | |
4539 | } | |
4540 | ||
4541 | // Add an entry to the PLT. | |
4542 | ||
4543 | template<bool big_endian> | |
4544 | void | |
4545 | Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym) | |
4546 | { | |
4547 | gold_assert(!gsym->has_plt_offset()); | |
4548 | ||
4549 | // Note that when setting the PLT offset we skip the initial | |
4550 | // reserved PLT entry. | |
4551 | gsym->set_plt_offset((this->count_) * sizeof(plt_entry) | |
4552 | + sizeof(first_plt_entry)); | |
4553 | ||
4554 | ++this->count_; | |
4555 | ||
4556 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
4557 | ||
4558 | // Every PLT entry needs a GOT entry which points back to the PLT | |
4559 | // entry (this will be changed by the dynamic linker, normally | |
4560 | // lazily when the function is called). | |
4561 | this->got_plt_->set_current_data_size(got_offset + 4); | |
4562 | ||
4563 | // Every PLT entry needs a reloc. | |
4564 | gsym->set_needs_dynsym_entry(); | |
4565 | this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_, | |
4566 | got_offset); | |
4567 | ||
4568 | // Note that we don't need to save the symbol. The contents of the | |
4569 | // PLT are independent of which symbols are used. The symbols only | |
4570 | // appear in the relocations. | |
4571 | } | |
4572 | ||
4573 | // ARM PLTs. | |
4574 | // FIXME: This is not very flexible. Right now this has only been tested | |
4575 | // on armv5te. If we are to support additional architecture features like | |
4576 | // Thumb-2 or BE8, we need to make this more flexible like GNU ld. | |
4577 | ||
4578 | // The first entry in the PLT. | |
4579 | template<bool big_endian> | |
4580 | const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] = | |
4581 | { | |
4582 | 0xe52de004, // str lr, [sp, #-4]! | |
4583 | 0xe59fe004, // ldr lr, [pc, #4] | |
4584 | 0xe08fe00e, // add lr, pc, lr | |
4585 | 0xe5bef008, // ldr pc, [lr, #8]! | |
4586 | 0x00000000, // &GOT[0] - . | |
4587 | }; | |
4588 | ||
4589 | // Subsequent entries in the PLT. | |
4590 | ||
4591 | template<bool big_endian> | |
4592 | const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] = | |
4593 | { | |
4594 | 0xe28fc600, // add ip, pc, #0xNN00000 | |
4595 | 0xe28cca00, // add ip, ip, #0xNN000 | |
4596 | 0xe5bcf000, // ldr pc, [ip, #0xNNN]! | |
4597 | }; | |
4598 | ||
4599 | // Write out the PLT. This uses the hand-coded instructions above, | |
4600 | // and adjusts them as needed. This is all specified by the arm ELF | |
4601 | // Processor Supplement. | |
4602 | ||
4603 | template<bool big_endian> | |
4604 | void | |
4605 | Output_data_plt_arm<big_endian>::do_write(Output_file* of) | |
4606 | { | |
2ea97941 | 4607 | const off_t offset = this->offset(); |
94cdfcff DK |
4608 | const section_size_type oview_size = |
4609 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 4610 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
94cdfcff DK |
4611 | |
4612 | const off_t got_file_offset = this->got_plt_->offset(); | |
4613 | const section_size_type got_size = | |
4614 | convert_to_section_size_type(this->got_plt_->data_size()); | |
4615 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
4616 | got_size); | |
4617 | unsigned char* pov = oview; | |
4618 | ||
ebabffbd DK |
4619 | Arm_address plt_address = this->address(); |
4620 | Arm_address got_address = this->got_plt_->address(); | |
94cdfcff DK |
4621 | |
4622 | // Write first PLT entry. All but the last word are constants. | |
4623 | const size_t num_first_plt_words = (sizeof(first_plt_entry) | |
4624 | / sizeof(plt_entry[0])); | |
4625 | for (size_t i = 0; i < num_first_plt_words - 1; i++) | |
4626 | elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]); | |
4627 | // Last word in first PLT entry is &GOT[0] - . | |
4628 | elfcpp::Swap<32, big_endian>::writeval(pov + 16, | |
4629 | got_address - (plt_address + 16)); | |
4630 | pov += sizeof(first_plt_entry); | |
4631 | ||
4632 | unsigned char* got_pov = got_view; | |
4633 | ||
4634 | memset(got_pov, 0, 12); | |
4635 | got_pov += 12; | |
4636 | ||
4637 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
4638 | unsigned int plt_offset = sizeof(first_plt_entry); | |
4639 | unsigned int plt_rel_offset = 0; | |
4640 | unsigned int got_offset = 12; | |
4641 | const unsigned int count = this->count_; | |
4642 | for (unsigned int i = 0; | |
4643 | i < count; | |
4644 | ++i, | |
4645 | pov += sizeof(plt_entry), | |
4646 | got_pov += 4, | |
4647 | plt_offset += sizeof(plt_entry), | |
4648 | plt_rel_offset += rel_size, | |
4649 | got_offset += 4) | |
4650 | { | |
4651 | // Set and adjust the PLT entry itself. | |
2ea97941 ILT |
4652 | int32_t offset = ((got_address + got_offset) |
4653 | - (plt_address + plt_offset + 8)); | |
94cdfcff | 4654 | |
2ea97941 ILT |
4655 | gold_assert(offset >= 0 && offset < 0x0fffffff); |
4656 | uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff); | |
94cdfcff | 4657 | elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0); |
2ea97941 | 4658 | uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff); |
94cdfcff | 4659 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1); |
2ea97941 | 4660 | uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff); |
94cdfcff DK |
4661 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2); |
4662 | ||
4663 | // Set the entry in the GOT. | |
4664 | elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address); | |
4665 | } | |
4666 | ||
4667 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
4668 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
4669 | ||
2ea97941 | 4670 | of->write_output_view(offset, oview_size, oview); |
94cdfcff DK |
4671 | of->write_output_view(got_file_offset, got_size, got_view); |
4672 | } | |
4673 | ||
4674 | // Create a PLT entry for a global symbol. | |
4675 | ||
4676 | template<bool big_endian> | |
4677 | void | |
2ea97941 | 4678 | Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
94cdfcff DK |
4679 | Symbol* gsym) |
4680 | { | |
4681 | if (gsym->has_plt_offset()) | |
4682 | return; | |
4683 | ||
4684 | if (this->plt_ == NULL) | |
4685 | { | |
4686 | // Create the GOT sections first. | |
2ea97941 | 4687 | this->got_section(symtab, layout); |
94cdfcff | 4688 | |
2ea97941 ILT |
4689 | this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_); |
4690 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
4691 | (elfcpp::SHF_ALLOC | |
4692 | | elfcpp::SHF_EXECINSTR), | |
1a2dff53 | 4693 | this->plt_, false, false, false, false); |
94cdfcff DK |
4694 | } |
4695 | this->plt_->add_entry(gsym); | |
4696 | } | |
4697 | ||
4a657b0d DK |
4698 | // Report an unsupported relocation against a local symbol. |
4699 | ||
4700 | template<bool big_endian> | |
4701 | void | |
4702 | Target_arm<big_endian>::Scan::unsupported_reloc_local( | |
4703 | Sized_relobj<32, big_endian>* object, | |
4704 | unsigned int r_type) | |
4705 | { | |
4706 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
4707 | object->name().c_str(), r_type); | |
4708 | } | |
4709 | ||
bec53400 DK |
4710 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
4711 | // dynamic linker does not support it, issue an error. The GNU linker | |
4712 | // only issues a non-PIC error for an allocated read-only section. | |
4713 | // Here we know the section is allocated, but we don't know that it is | |
4714 | // read-only. But we check for all the relocation types which the | |
4715 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
4716 | // error even if the section is not read-only. | |
4717 | ||
4718 | template<bool big_endian> | |
4719 | void | |
4720 | Target_arm<big_endian>::Scan::check_non_pic(Relobj* object, | |
4721 | unsigned int r_type) | |
4722 | { | |
4723 | switch (r_type) | |
4724 | { | |
4725 | // These are the relocation types supported by glibc for ARM. | |
4726 | case elfcpp::R_ARM_RELATIVE: | |
4727 | case elfcpp::R_ARM_COPY: | |
4728 | case elfcpp::R_ARM_GLOB_DAT: | |
4729 | case elfcpp::R_ARM_JUMP_SLOT: | |
4730 | case elfcpp::R_ARM_ABS32: | |
be8fcb75 | 4731 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
4732 | case elfcpp::R_ARM_PC24: |
4733 | // FIXME: The following 3 types are not supported by Android's dynamic | |
4734 | // linker. | |
4735 | case elfcpp::R_ARM_TLS_DTPMOD32: | |
4736 | case elfcpp::R_ARM_TLS_DTPOFF32: | |
4737 | case elfcpp::R_ARM_TLS_TPOFF32: | |
4738 | return; | |
4739 | ||
4740 | default: | |
4741 | // This prevents us from issuing more than one error per reloc | |
4742 | // section. But we can still wind up issuing more than one | |
4743 | // error per object file. | |
4744 | if (this->issued_non_pic_error_) | |
4745 | return; | |
4746 | object->error(_("requires unsupported dynamic reloc; " | |
4747 | "recompile with -fPIC")); | |
4748 | this->issued_non_pic_error_ = true; | |
4749 | return; | |
4750 | ||
4751 | case elfcpp::R_ARM_NONE: | |
4752 | gold_unreachable(); | |
4753 | } | |
4754 | } | |
4755 | ||
4a657b0d | 4756 | // Scan a relocation for a local symbol. |
bec53400 DK |
4757 | // FIXME: This only handles a subset of relocation types used by Android |
4758 | // on ARM v5te devices. | |
4a657b0d DK |
4759 | |
4760 | template<bool big_endian> | |
4761 | inline void | |
ad0f2072 | 4762 | Target_arm<big_endian>::Scan::local(Symbol_table* symtab, |
2ea97941 | 4763 | Layout* layout, |
bec53400 | 4764 | Target_arm* target, |
4a657b0d | 4765 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
4766 | unsigned int data_shndx, |
4767 | Output_section* output_section, | |
4768 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
4769 | unsigned int r_type, |
4770 | const elfcpp::Sym<32, big_endian>&) | |
4771 | { | |
a6d1ef57 | 4772 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
4773 | switch (r_type) |
4774 | { | |
4775 | case elfcpp::R_ARM_NONE: | |
4776 | break; | |
4777 | ||
bec53400 | 4778 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 4779 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
4780 | // If building a shared library (or a position-independent |
4781 | // executable), we need to create a dynamic relocation for | |
4782 | // this location. The relocation applied at link time will | |
4783 | // apply the link-time value, so we flag the location with | |
4784 | // an R_ARM_RELATIVE relocation so the dynamic loader can | |
4785 | // relocate it easily. | |
4786 | if (parameters->options().output_is_position_independent()) | |
4787 | { | |
2ea97941 | 4788 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4789 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
4790 | // If we are to add more other reloc types than R_ARM_ABS32, | |
4791 | // we need to add check_non_pic(object, r_type) here. | |
4792 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE, | |
4793 | output_section, data_shndx, | |
4794 | reloc.get_r_offset()); | |
4795 | } | |
4796 | break; | |
4797 | ||
4798 | case elfcpp::R_ARM_REL32: | |
4799 | case elfcpp::R_ARM_THM_CALL: | |
4800 | case elfcpp::R_ARM_CALL: | |
4801 | case elfcpp::R_ARM_PREL31: | |
4802 | case elfcpp::R_ARM_JUMP24: | |
4803 | case elfcpp::R_ARM_PLT32: | |
be8fcb75 ILT |
4804 | case elfcpp::R_ARM_THM_ABS5: |
4805 | case elfcpp::R_ARM_ABS8: | |
4806 | case elfcpp::R_ARM_ABS12: | |
4807 | case elfcpp::R_ARM_ABS16: | |
4808 | case elfcpp::R_ARM_BASE_ABS: | |
fd3c5f0b ILT |
4809 | case elfcpp::R_ARM_MOVW_ABS_NC: |
4810 | case elfcpp::R_ARM_MOVT_ABS: | |
4811 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
4812 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
4813 | case elfcpp::R_ARM_MOVW_PREL_NC: |
4814 | case elfcpp::R_ARM_MOVT_PREL: | |
4815 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
4816 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
bec53400 DK |
4817 | break; |
4818 | ||
4819 | case elfcpp::R_ARM_GOTOFF32: | |
4820 | // We need a GOT section: | |
2ea97941 | 4821 | target->got_section(symtab, layout); |
bec53400 DK |
4822 | break; |
4823 | ||
4824 | case elfcpp::R_ARM_BASE_PREL: | |
4825 | // FIXME: What about this? | |
4826 | break; | |
4827 | ||
4828 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 4829 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
4830 | { |
4831 | // The symbol requires a GOT entry. | |
4832 | Output_data_got<32, big_endian>* got = | |
2ea97941 | 4833 | target->got_section(symtab, layout); |
bec53400 DK |
4834 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
4835 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) | |
4836 | { | |
4837 | // If we are generating a shared object, we need to add a | |
4838 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
4839 | if (parameters->options().output_is_position_independent()) | |
4840 | { | |
2ea97941 ILT |
4841 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
4842 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
bec53400 | 4843 | rel_dyn->add_local_relative( |
2ea97941 ILT |
4844 | object, r_sym, elfcpp::R_ARM_RELATIVE, got, |
4845 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
bec53400 DK |
4846 | } |
4847 | } | |
4848 | } | |
4849 | break; | |
4850 | ||
4851 | case elfcpp::R_ARM_TARGET1: | |
4852 | // This should have been mapped to another type already. | |
4853 | // Fall through. | |
4854 | case elfcpp::R_ARM_COPY: | |
4855 | case elfcpp::R_ARM_GLOB_DAT: | |
4856 | case elfcpp::R_ARM_JUMP_SLOT: | |
4857 | case elfcpp::R_ARM_RELATIVE: | |
4858 | // These are relocations which should only be seen by the | |
4859 | // dynamic linker, and should never be seen here. | |
4860 | gold_error(_("%s: unexpected reloc %u in object file"), | |
4861 | object->name().c_str(), r_type); | |
4862 | break; | |
4863 | ||
4a657b0d DK |
4864 | default: |
4865 | unsupported_reloc_local(object, r_type); | |
4866 | break; | |
4867 | } | |
4868 | } | |
4869 | ||
4870 | // Report an unsupported relocation against a global symbol. | |
4871 | ||
4872 | template<bool big_endian> | |
4873 | void | |
4874 | Target_arm<big_endian>::Scan::unsupported_reloc_global( | |
4875 | Sized_relobj<32, big_endian>* object, | |
4876 | unsigned int r_type, | |
4877 | Symbol* gsym) | |
4878 | { | |
4879 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
4880 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
4881 | } | |
4882 | ||
4883 | // Scan a relocation for a global symbol. | |
bec53400 DK |
4884 | // FIXME: This only handles a subset of relocation types used by Android |
4885 | // on ARM v5te devices. | |
4a657b0d DK |
4886 | |
4887 | template<bool big_endian> | |
4888 | inline void | |
ad0f2072 | 4889 | Target_arm<big_endian>::Scan::global(Symbol_table* symtab, |
2ea97941 | 4890 | Layout* layout, |
bec53400 | 4891 | Target_arm* target, |
4a657b0d | 4892 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
4893 | unsigned int data_shndx, |
4894 | Output_section* output_section, | |
4895 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
4896 | unsigned int r_type, |
4897 | Symbol* gsym) | |
4898 | { | |
a6d1ef57 | 4899 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
4900 | switch (r_type) |
4901 | { | |
4902 | case elfcpp::R_ARM_NONE: | |
4903 | break; | |
4904 | ||
bec53400 | 4905 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 4906 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
4907 | { |
4908 | // Make a dynamic relocation if necessary. | |
4909 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) | |
4910 | { | |
4911 | if (target->may_need_copy_reloc(gsym)) | |
4912 | { | |
2ea97941 | 4913 | target->copy_reloc(symtab, layout, object, |
bec53400 DK |
4914 | data_shndx, output_section, gsym, reloc); |
4915 | } | |
4916 | else if (gsym->can_use_relative_reloc(false)) | |
4917 | { | |
4918 | // If we are to add more other reloc types than R_ARM_ABS32, | |
4919 | // we need to add check_non_pic(object, r_type) here. | |
2ea97941 | 4920 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4921 | rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE, |
4922 | output_section, object, | |
4923 | data_shndx, reloc.get_r_offset()); | |
4924 | } | |
4925 | else | |
4926 | { | |
4927 | // If we are to add more other reloc types than R_ARM_ABS32, | |
4928 | // we need to add check_non_pic(object, r_type) here. | |
2ea97941 | 4929 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4930 | rel_dyn->add_global(gsym, r_type, output_section, object, |
4931 | data_shndx, reloc.get_r_offset()); | |
4932 | } | |
4933 | } | |
4934 | } | |
4935 | break; | |
4936 | ||
fd3c5f0b ILT |
4937 | case elfcpp::R_ARM_MOVW_ABS_NC: |
4938 | case elfcpp::R_ARM_MOVT_ABS: | |
4939 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
4940 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
4941 | case elfcpp::R_ARM_MOVW_PREL_NC: |
4942 | case elfcpp::R_ARM_MOVT_PREL: | |
4943 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
4944 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
fd3c5f0b ILT |
4945 | break; |
4946 | ||
be8fcb75 ILT |
4947 | case elfcpp::R_ARM_THM_ABS5: |
4948 | case elfcpp::R_ARM_ABS8: | |
4949 | case elfcpp::R_ARM_ABS12: | |
4950 | case elfcpp::R_ARM_ABS16: | |
4951 | case elfcpp::R_ARM_BASE_ABS: | |
4952 | { | |
4953 | // No dynamic relocs of this kinds. | |
4954 | // Report the error in case of PIC. | |
4955 | int flags = Symbol::NON_PIC_REF; | |
4956 | if (gsym->type() == elfcpp::STT_FUNC | |
4957 | || gsym->type() == elfcpp::STT_ARM_TFUNC) | |
4958 | flags |= Symbol::FUNCTION_CALL; | |
4959 | if (gsym->needs_dynamic_reloc(flags)) | |
4960 | check_non_pic(object, r_type); | |
4961 | } | |
4962 | break; | |
4963 | ||
bec53400 DK |
4964 | case elfcpp::R_ARM_REL32: |
4965 | case elfcpp::R_ARM_PREL31: | |
4966 | { | |
4967 | // Make a dynamic relocation if necessary. | |
4968 | int flags = Symbol::NON_PIC_REF; | |
4969 | if (gsym->needs_dynamic_reloc(flags)) | |
4970 | { | |
4971 | if (target->may_need_copy_reloc(gsym)) | |
4972 | { | |
2ea97941 | 4973 | target->copy_reloc(symtab, layout, object, |
bec53400 DK |
4974 | data_shndx, output_section, gsym, reloc); |
4975 | } | |
4976 | else | |
4977 | { | |
4978 | check_non_pic(object, r_type); | |
2ea97941 | 4979 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
4980 | rel_dyn->add_global(gsym, r_type, output_section, object, |
4981 | data_shndx, reloc.get_r_offset()); | |
4982 | } | |
4983 | } | |
4984 | } | |
4985 | break; | |
4986 | ||
4987 | case elfcpp::R_ARM_JUMP24: | |
f4e5969c | 4988 | case elfcpp::R_ARM_THM_JUMP24: |
bec53400 | 4989 | case elfcpp::R_ARM_CALL: |
f4e5969c DK |
4990 | case elfcpp::R_ARM_THM_CALL: |
4991 | ||
4992 | if (Target_arm<big_endian>::Scan::symbol_needs_plt_entry(gsym)) | |
2ea97941 | 4993 | target->make_plt_entry(symtab, layout, gsym); |
f4e5969c DK |
4994 | else |
4995 | { | |
4996 | // Check to see if this is a function that would need a PLT | |
4997 | // but does not get one because the function symbol is untyped. | |
4998 | // This happens in assembly code missing a proper .type directive. | |
4999 | if ((!gsym->is_undefined() || parameters->options().shared()) | |
5000 | && !parameters->doing_static_link() | |
5001 | && gsym->type() == elfcpp::STT_NOTYPE | |
5002 | && (gsym->is_from_dynobj() | |
5003 | || gsym->is_undefined() | |
5004 | || gsym->is_preemptible())) | |
5005 | gold_error(_("%s is not a function."), | |
5006 | gsym->demangled_name().c_str()); | |
5007 | } | |
bec53400 DK |
5008 | break; |
5009 | ||
5010 | case elfcpp::R_ARM_PLT32: | |
5011 | // If the symbol is fully resolved, this is just a relative | |
5012 | // local reloc. Otherwise we need a PLT entry. | |
5013 | if (gsym->final_value_is_known()) | |
5014 | break; | |
5015 | // If building a shared library, we can also skip the PLT entry | |
5016 | // if the symbol is defined in the output file and is protected | |
5017 | // or hidden. | |
5018 | if (gsym->is_defined() | |
5019 | && !gsym->is_from_dynobj() | |
5020 | && !gsym->is_preemptible()) | |
5021 | break; | |
2ea97941 | 5022 | target->make_plt_entry(symtab, layout, gsym); |
bec53400 DK |
5023 | break; |
5024 | ||
5025 | case elfcpp::R_ARM_GOTOFF32: | |
5026 | // We need a GOT section. | |
2ea97941 | 5027 | target->got_section(symtab, layout); |
bec53400 DK |
5028 | break; |
5029 | ||
5030 | case elfcpp::R_ARM_BASE_PREL: | |
5031 | // FIXME: What about this? | |
5032 | break; | |
5033 | ||
5034 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5035 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
5036 | { |
5037 | // The symbol requires a GOT entry. | |
5038 | Output_data_got<32, big_endian>* got = | |
2ea97941 | 5039 | target->got_section(symtab, layout); |
bec53400 DK |
5040 | if (gsym->final_value_is_known()) |
5041 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
5042 | else | |
5043 | { | |
5044 | // If this symbol is not fully resolved, we need to add a | |
5045 | // GOT entry with a dynamic relocation. | |
2ea97941 | 5046 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
5047 | if (gsym->is_from_dynobj() |
5048 | || gsym->is_undefined() | |
5049 | || gsym->is_preemptible()) | |
5050 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, | |
5051 | rel_dyn, elfcpp::R_ARM_GLOB_DAT); | |
5052 | else | |
5053 | { | |
5054 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) | |
5055 | rel_dyn->add_global_relative( | |
5056 | gsym, elfcpp::R_ARM_RELATIVE, got, | |
5057 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
5058 | } | |
5059 | } | |
5060 | } | |
5061 | break; | |
5062 | ||
5063 | case elfcpp::R_ARM_TARGET1: | |
5064 | // This should have been mapped to another type already. | |
5065 | // Fall through. | |
5066 | case elfcpp::R_ARM_COPY: | |
5067 | case elfcpp::R_ARM_GLOB_DAT: | |
5068 | case elfcpp::R_ARM_JUMP_SLOT: | |
5069 | case elfcpp::R_ARM_RELATIVE: | |
5070 | // These are relocations which should only be seen by the | |
5071 | // dynamic linker, and should never be seen here. | |
5072 | gold_error(_("%s: unexpected reloc %u in object file"), | |
5073 | object->name().c_str(), r_type); | |
5074 | break; | |
5075 | ||
4a657b0d DK |
5076 | default: |
5077 | unsupported_reloc_global(object, r_type, gsym); | |
5078 | break; | |
5079 | } | |
5080 | } | |
5081 | ||
5082 | // Process relocations for gc. | |
5083 | ||
5084 | template<bool big_endian> | |
5085 | void | |
ad0f2072 | 5086 | Target_arm<big_endian>::gc_process_relocs(Symbol_table* symtab, |
2ea97941 | 5087 | Layout* layout, |
4a657b0d DK |
5088 | Sized_relobj<32, big_endian>* object, |
5089 | unsigned int data_shndx, | |
5090 | unsigned int, | |
5091 | const unsigned char* prelocs, | |
5092 | size_t reloc_count, | |
5093 | Output_section* output_section, | |
5094 | bool needs_special_offset_handling, | |
5095 | size_t local_symbol_count, | |
5096 | const unsigned char* plocal_symbols) | |
5097 | { | |
5098 | typedef Target_arm<big_endian> Arm; | |
2ea97941 | 5099 | typedef typename Target_arm<big_endian>::Scan Scan; |
4a657b0d | 5100 | |
2ea97941 | 5101 | gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>( |
4a657b0d | 5102 | symtab, |
2ea97941 | 5103 | layout, |
4a657b0d DK |
5104 | this, |
5105 | object, | |
5106 | data_shndx, | |
5107 | prelocs, | |
5108 | reloc_count, | |
5109 | output_section, | |
5110 | needs_special_offset_handling, | |
5111 | local_symbol_count, | |
5112 | plocal_symbols); | |
5113 | } | |
5114 | ||
5115 | // Scan relocations for a section. | |
5116 | ||
5117 | template<bool big_endian> | |
5118 | void | |
ad0f2072 | 5119 | Target_arm<big_endian>::scan_relocs(Symbol_table* symtab, |
2ea97941 | 5120 | Layout* layout, |
4a657b0d DK |
5121 | Sized_relobj<32, big_endian>* object, |
5122 | unsigned int data_shndx, | |
5123 | unsigned int sh_type, | |
5124 | const unsigned char* prelocs, | |
5125 | size_t reloc_count, | |
5126 | Output_section* output_section, | |
5127 | bool needs_special_offset_handling, | |
5128 | size_t local_symbol_count, | |
5129 | const unsigned char* plocal_symbols) | |
5130 | { | |
2ea97941 | 5131 | typedef typename Target_arm<big_endian>::Scan Scan; |
4a657b0d DK |
5132 | if (sh_type == elfcpp::SHT_RELA) |
5133 | { | |
5134 | gold_error(_("%s: unsupported RELA reloc section"), | |
5135 | object->name().c_str()); | |
5136 | return; | |
5137 | } | |
5138 | ||
2ea97941 | 5139 | gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>( |
4a657b0d | 5140 | symtab, |
2ea97941 | 5141 | layout, |
4a657b0d DK |
5142 | this, |
5143 | object, | |
5144 | data_shndx, | |
5145 | prelocs, | |
5146 | reloc_count, | |
5147 | output_section, | |
5148 | needs_special_offset_handling, | |
5149 | local_symbol_count, | |
5150 | plocal_symbols); | |
5151 | } | |
5152 | ||
5153 | // Finalize the sections. | |
5154 | ||
5155 | template<bool big_endian> | |
5156 | void | |
d5b40221 | 5157 | Target_arm<big_endian>::do_finalize_sections( |
2ea97941 | 5158 | Layout* layout, |
f59f41f3 DK |
5159 | const Input_objects* input_objects, |
5160 | Symbol_table* symtab) | |
4a657b0d | 5161 | { |
d5b40221 DK |
5162 | // Merge processor-specific flags. |
5163 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
5164 | p != input_objects->relobj_end(); | |
5165 | ++p) | |
5166 | { | |
5167 | Arm_relobj<big_endian>* arm_relobj = | |
5168 | Arm_relobj<big_endian>::as_arm_relobj(*p); | |
5169 | this->merge_processor_specific_flags( | |
5170 | arm_relobj->name(), | |
5171 | arm_relobj->processor_specific_flags()); | |
a0351a69 DK |
5172 | this->merge_object_attributes(arm_relobj->name().c_str(), |
5173 | arm_relobj->attributes_section_data()); | |
5174 | ||
d5b40221 DK |
5175 | } |
5176 | ||
5177 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); | |
5178 | p != input_objects->dynobj_end(); | |
5179 | ++p) | |
5180 | { | |
5181 | Arm_dynobj<big_endian>* arm_dynobj = | |
5182 | Arm_dynobj<big_endian>::as_arm_dynobj(*p); | |
5183 | this->merge_processor_specific_flags( | |
5184 | arm_dynobj->name(), | |
5185 | arm_dynobj->processor_specific_flags()); | |
a0351a69 DK |
5186 | this->merge_object_attributes(arm_dynobj->name().c_str(), |
5187 | arm_dynobj->attributes_section_data()); | |
d5b40221 DK |
5188 | } |
5189 | ||
a0351a69 DK |
5190 | // Check BLX use. |
5191 | Object_attribute* attr = | |
5192 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
5193 | if (attr->int_value() > elfcpp::TAG_CPU_ARCH_V4) | |
5194 | this->set_may_use_blx(true); | |
5195 | ||
94cdfcff | 5196 | // Fill in some more dynamic tags. |
ea715a34 ILT |
5197 | const Reloc_section* rel_plt = (this->plt_ == NULL |
5198 | ? NULL | |
5199 | : this->plt_->rel_plt()); | |
5200 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
5201 | this->rel_dyn_, true); | |
94cdfcff DK |
5202 | |
5203 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
5204 | // relocs. | |
5205 | if (this->copy_relocs_.any_saved_relocs()) | |
2ea97941 | 5206 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); |
11af873f | 5207 | |
f59f41f3 | 5208 | // Handle the .ARM.exidx section. |
2ea97941 | 5209 | Output_section* exidx_section = layout->find_output_section(".ARM.exidx"); |
f59f41f3 DK |
5210 | if (exidx_section != NULL |
5211 | && exidx_section->type() == elfcpp::SHT_ARM_EXIDX | |
11af873f DK |
5212 | && !parameters->options().relocatable()) |
5213 | { | |
f59f41f3 | 5214 | // Create __exidx_start and __exdix_end symbols. |
99fff23b ILT |
5215 | symtab->define_in_output_data("__exidx_start", NULL, |
5216 | Symbol_table::PREDEFINED, | |
5217 | exidx_section, 0, 0, elfcpp::STT_OBJECT, | |
a0351a69 | 5218 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, |
99e5bff2 | 5219 | false, true); |
99fff23b ILT |
5220 | symtab->define_in_output_data("__exidx_end", NULL, |
5221 | Symbol_table::PREDEFINED, | |
5222 | exidx_section, 0, 0, elfcpp::STT_OBJECT, | |
a0351a69 | 5223 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, |
99e5bff2 | 5224 | true, true); |
11af873f | 5225 | |
f59f41f3 DK |
5226 | // For the ARM target, we need to add a PT_ARM_EXIDX segment for |
5227 | // the .ARM.exidx section. | |
2ea97941 | 5228 | if (!layout->script_options()->saw_phdrs_clause()) |
11af873f | 5229 | { |
2ea97941 | 5230 | gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0, 0) |
11af873f DK |
5231 | == NULL); |
5232 | Output_segment* exidx_segment = | |
2ea97941 | 5233 | layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R); |
f5c870d2 ILT |
5234 | exidx_segment->add_output_section(exidx_section, elfcpp::PF_R, |
5235 | false); | |
11af873f DK |
5236 | } |
5237 | } | |
a0351a69 DK |
5238 | |
5239 | // Create an .ARM.attributes section if there is not one already. | |
2ea97941 | 5240 | Output_attributes_section_data* attributes_section = |
a0351a69 | 5241 | new Output_attributes_section_data(*this->attributes_section_data_); |
2ea97941 ILT |
5242 | layout->add_output_section_data(".ARM.attributes", |
5243 | elfcpp::SHT_ARM_ATTRIBUTES, 0, | |
1a2dff53 ILT |
5244 | attributes_section, false, false, false, |
5245 | false); | |
4a657b0d DK |
5246 | } |
5247 | ||
bec53400 DK |
5248 | // Return whether a direct absolute static relocation needs to be applied. |
5249 | // In cases where Scan::local() or Scan::global() has created | |
5250 | // a dynamic relocation other than R_ARM_RELATIVE, the addend | |
5251 | // of the relocation is carried in the data, and we must not | |
5252 | // apply the static relocation. | |
5253 | ||
5254 | template<bool big_endian> | |
5255 | inline bool | |
5256 | Target_arm<big_endian>::Relocate::should_apply_static_reloc( | |
5257 | const Sized_symbol<32>* gsym, | |
5258 | int ref_flags, | |
5259 | bool is_32bit, | |
5260 | Output_section* output_section) | |
5261 | { | |
5262 | // If the output section is not allocated, then we didn't call | |
5263 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
5264 | // the reloc here. | |
5265 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
5266 | return true; | |
5267 | ||
5268 | // For local symbols, we will have created a non-RELATIVE dynamic | |
5269 | // relocation only if (a) the output is position independent, | |
5270 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
5271 | // (c) the relocation is not 32 bits wide. | |
5272 | if (gsym == NULL) | |
5273 | return !(parameters->options().output_is_position_independent() | |
5274 | && (ref_flags & Symbol::ABSOLUTE_REF) | |
5275 | && !is_32bit); | |
5276 | ||
5277 | // For global symbols, we use the same helper routines used in the | |
5278 | // scan pass. If we did not create a dynamic relocation, or if we | |
5279 | // created a RELATIVE dynamic relocation, we should apply the static | |
5280 | // relocation. | |
5281 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
5282 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
5283 | && gsym->can_use_relative_reloc(ref_flags | |
5284 | & Symbol::FUNCTION_CALL); | |
5285 | return !has_dyn || is_rel; | |
5286 | } | |
5287 | ||
4a657b0d DK |
5288 | // Perform a relocation. |
5289 | ||
5290 | template<bool big_endian> | |
5291 | inline bool | |
5292 | Target_arm<big_endian>::Relocate::relocate( | |
c121c671 DK |
5293 | const Relocate_info<32, big_endian>* relinfo, |
5294 | Target_arm* target, | |
5295 | Output_section *output_section, | |
5296 | size_t relnum, | |
5297 | const elfcpp::Rel<32, big_endian>& rel, | |
4a657b0d | 5298 | unsigned int r_type, |
c121c671 DK |
5299 | const Sized_symbol<32>* gsym, |
5300 | const Symbol_value<32>* psymval, | |
5301 | unsigned char* view, | |
ebabffbd | 5302 | Arm_address address, |
4a657b0d DK |
5303 | section_size_type /* view_size */ ) |
5304 | { | |
c121c671 DK |
5305 | typedef Arm_relocate_functions<big_endian> Arm_relocate_functions; |
5306 | ||
a6d1ef57 | 5307 | r_type = get_real_reloc_type(r_type); |
c121c671 | 5308 | |
2daedcd6 DK |
5309 | const Arm_relobj<big_endian>* object = |
5310 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
c121c671 | 5311 | |
2daedcd6 DK |
5312 | // If the final branch target of a relocation is THUMB instruction, this |
5313 | // is 1. Otherwise it is 0. | |
5314 | Arm_address thumb_bit = 0; | |
c121c671 | 5315 | Symbol_value<32> symval; |
d204b6e9 | 5316 | bool is_weakly_undefined_without_plt = false; |
2daedcd6 | 5317 | if (relnum != Target_arm<big_endian>::fake_relnum_for_stubs) |
c121c671 | 5318 | { |
2daedcd6 DK |
5319 | if (gsym != NULL) |
5320 | { | |
5321 | // This is a global symbol. Determine if we use PLT and if the | |
5322 | // final target is THUMB. | |
5323 | if (gsym->use_plt_offset(reloc_is_non_pic(r_type))) | |
5324 | { | |
5325 | // This uses a PLT, change the symbol value. | |
5326 | symval.set_output_value(target->plt_section()->address() | |
5327 | + gsym->plt_offset()); | |
5328 | psymval = &symval; | |
5329 | } | |
d204b6e9 DK |
5330 | else if (gsym->is_weak_undefined()) |
5331 | { | |
5332 | // This is a weakly undefined symbol and we do not use PLT | |
5333 | // for this relocation. A branch targeting this symbol will | |
5334 | // be converted into an NOP. | |
5335 | is_weakly_undefined_without_plt = true; | |
5336 | } | |
2daedcd6 DK |
5337 | else |
5338 | { | |
5339 | // Set thumb bit if symbol: | |
5340 | // -Has type STT_ARM_TFUNC or | |
5341 | // -Has type STT_FUNC, is defined and with LSB in value set. | |
5342 | thumb_bit = | |
5343 | (((gsym->type() == elfcpp::STT_ARM_TFUNC) | |
5344 | || (gsym->type() == elfcpp::STT_FUNC | |
5345 | && !gsym->is_undefined() | |
5346 | && ((psymval->value(object, 0) & 1) != 0))) | |
5347 | ? 1 | |
5348 | : 0); | |
5349 | } | |
5350 | } | |
5351 | else | |
5352 | { | |
5353 | // This is a local symbol. Determine if the final target is THUMB. | |
5354 | // We saved this information when all the local symbols were read. | |
5355 | elfcpp::Elf_types<32>::Elf_WXword r_info = rel.get_r_info(); | |
5356 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
5357 | thumb_bit = object->local_symbol_is_thumb_function(r_sym) ? 1 : 0; | |
5358 | } | |
5359 | } | |
5360 | else | |
5361 | { | |
5362 | // This is a fake relocation synthesized for a stub. It does not have | |
5363 | // a real symbol. We just look at the LSB of the symbol value to | |
5364 | // determine if the target is THUMB or not. | |
5365 | thumb_bit = ((psymval->value(object, 0) & 1) != 0); | |
c121c671 DK |
5366 | } |
5367 | ||
2daedcd6 DK |
5368 | // Strip LSB if this points to a THUMB target. |
5369 | if (thumb_bit != 0 | |
5370 | && Target_arm<big_endian>::reloc_uses_thumb_bit(r_type) | |
5371 | && ((psymval->value(object, 0) & 1) != 0)) | |
5372 | { | |
5373 | Arm_address stripped_value = | |
5374 | psymval->value(object, 0) & ~static_cast<Arm_address>(1); | |
5375 | symval.set_output_value(stripped_value); | |
5376 | psymval = &symval; | |
5377 | } | |
5378 | ||
c121c671 DK |
5379 | // Get the GOT offset if needed. |
5380 | // The GOT pointer points to the end of the GOT section. | |
5381 | // We need to subtract the size of the GOT section to get | |
5382 | // the actual offset to use in the relocation. | |
5383 | bool have_got_offset = false; | |
5384 | unsigned int got_offset = 0; | |
5385 | switch (r_type) | |
5386 | { | |
5387 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5388 | case elfcpp::R_ARM_GOT_PREL: |
c121c671 DK |
5389 | if (gsym != NULL) |
5390 | { | |
5391 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
5392 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
5393 | - target->got_size()); | |
5394 | } | |
5395 | else | |
5396 | { | |
5397 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
5398 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
5399 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
5400 | - target->got_size()); | |
5401 | } | |
5402 | have_got_offset = true; | |
5403 | break; | |
5404 | ||
5405 | default: | |
5406 | break; | |
5407 | } | |
5408 | ||
d204b6e9 DK |
5409 | // To look up relocation stubs, we need to pass the symbol table index of |
5410 | // a local symbol. | |
5411 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
5412 | ||
c121c671 DK |
5413 | typename Arm_relocate_functions::Status reloc_status = |
5414 | Arm_relocate_functions::STATUS_OKAY; | |
4a657b0d DK |
5415 | switch (r_type) |
5416 | { | |
5417 | case elfcpp::R_ARM_NONE: | |
5418 | break; | |
5419 | ||
5e445df6 ILT |
5420 | case elfcpp::R_ARM_ABS8: |
5421 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5422 | output_section)) | |
be8fcb75 ILT |
5423 | reloc_status = Arm_relocate_functions::abs8(view, object, psymval); |
5424 | break; | |
5425 | ||
5426 | case elfcpp::R_ARM_ABS12: | |
5427 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5428 | output_section)) | |
5429 | reloc_status = Arm_relocate_functions::abs12(view, object, psymval); | |
5430 | break; | |
5431 | ||
5432 | case elfcpp::R_ARM_ABS16: | |
5433 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5434 | output_section)) | |
5435 | reloc_status = Arm_relocate_functions::abs16(view, object, psymval); | |
5e445df6 ILT |
5436 | break; |
5437 | ||
c121c671 DK |
5438 | case elfcpp::R_ARM_ABS32: |
5439 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5440 | output_section)) | |
5441 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
2daedcd6 | 5442 | thumb_bit); |
c121c671 DK |
5443 | break; |
5444 | ||
be8fcb75 ILT |
5445 | case elfcpp::R_ARM_ABS32_NOI: |
5446 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5447 | output_section)) | |
5448 | // No thumb bit for this relocation: (S + A) | |
5449 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
f4e5969c | 5450 | 0); |
be8fcb75 ILT |
5451 | break; |
5452 | ||
fd3c5f0b ILT |
5453 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5454 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5455 | output_section)) | |
5456 | reloc_status = Arm_relocate_functions::movw_abs_nc(view, object, | |
5457 | psymval, | |
2daedcd6 | 5458 | thumb_bit); |
fd3c5f0b ILT |
5459 | else |
5460 | gold_error(_("relocation R_ARM_MOVW_ABS_NC cannot be used when making" | |
5461 | "a shared object; recompile with -fPIC")); | |
5462 | break; | |
5463 | ||
5464 | case elfcpp::R_ARM_MOVT_ABS: | |
5465 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5466 | output_section)) | |
5467 | reloc_status = Arm_relocate_functions::movt_abs(view, object, psymval); | |
5468 | else | |
5469 | gold_error(_("relocation R_ARM_MOVT_ABS cannot be used when making" | |
5470 | "a shared object; recompile with -fPIC")); | |
5471 | break; | |
5472 | ||
5473 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5474 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5475 | output_section)) | |
5476 | reloc_status = Arm_relocate_functions::thm_movw_abs_nc(view, object, | |
5477 | psymval, | |
2daedcd6 | 5478 | thumb_bit); |
fd3c5f0b ILT |
5479 | else |
5480 | gold_error(_("relocation R_ARM_THM_MOVW_ABS_NC cannot be used when" | |
5481 | "making a shared object; recompile with -fPIC")); | |
5482 | break; | |
5483 | ||
5484 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
5485 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5486 | output_section)) | |
5487 | reloc_status = Arm_relocate_functions::thm_movt_abs(view, object, | |
5488 | psymval); | |
5489 | else | |
5490 | gold_error(_("relocation R_ARM_THM_MOVT_ABS cannot be used when" | |
5491 | "making a shared object; recompile with -fPIC")); | |
5492 | break; | |
5493 | ||
c2a122b6 ILT |
5494 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5495 | reloc_status = Arm_relocate_functions::movw_prel_nc(view, object, | |
5496 | psymval, address, | |
2daedcd6 | 5497 | thumb_bit); |
c2a122b6 ILT |
5498 | break; |
5499 | ||
5500 | case elfcpp::R_ARM_MOVT_PREL: | |
5501 | reloc_status = Arm_relocate_functions::movt_prel(view, object, | |
5502 | psymval, address); | |
5503 | break; | |
5504 | ||
5505 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5506 | reloc_status = Arm_relocate_functions::thm_movw_prel_nc(view, object, | |
5507 | psymval, address, | |
2daedcd6 | 5508 | thumb_bit); |
c2a122b6 ILT |
5509 | break; |
5510 | ||
5511 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
5512 | reloc_status = Arm_relocate_functions::thm_movt_prel(view, object, | |
5513 | psymval, address); | |
5514 | break; | |
5515 | ||
c121c671 DK |
5516 | case elfcpp::R_ARM_REL32: |
5517 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
2daedcd6 | 5518 | address, thumb_bit); |
c121c671 DK |
5519 | break; |
5520 | ||
be8fcb75 ILT |
5521 | case elfcpp::R_ARM_THM_ABS5: |
5522 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5523 | output_section)) | |
5524 | reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval); | |
5525 | break; | |
5526 | ||
c121c671 | 5527 | case elfcpp::R_ARM_THM_CALL: |
51938283 DK |
5528 | reloc_status = |
5529 | Arm_relocate_functions::thm_call(relinfo, view, gsym, object, r_sym, | |
5530 | psymval, address, thumb_bit, | |
5531 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5532 | break; |
5533 | ||
d204b6e9 DK |
5534 | case elfcpp::R_ARM_XPC25: |
5535 | reloc_status = | |
5536 | Arm_relocate_functions::xpc25(relinfo, view, gsym, object, r_sym, | |
5537 | psymval, address, thumb_bit, | |
5538 | is_weakly_undefined_without_plt); | |
5539 | break; | |
5540 | ||
51938283 DK |
5541 | case elfcpp::R_ARM_THM_XPC22: |
5542 | reloc_status = | |
5543 | Arm_relocate_functions::thm_xpc22(relinfo, view, gsym, object, r_sym, | |
5544 | psymval, address, thumb_bit, | |
5545 | is_weakly_undefined_without_plt); | |
5546 | break; | |
5547 | ||
c121c671 DK |
5548 | case elfcpp::R_ARM_GOTOFF32: |
5549 | { | |
ebabffbd | 5550 | Arm_address got_origin; |
c121c671 DK |
5551 | got_origin = target->got_plt_section()->address(); |
5552 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
2daedcd6 | 5553 | got_origin, thumb_bit); |
c121c671 DK |
5554 | } |
5555 | break; | |
5556 | ||
5557 | case elfcpp::R_ARM_BASE_PREL: | |
5558 | { | |
5559 | uint32_t origin; | |
5560 | // Get the addressing origin of the output segment defining the | |
5561 | // symbol gsym (AAELF 4.6.1.2 Relocation types) | |
5562 | gold_assert(gsym != NULL); | |
5563 | if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
5564 | origin = gsym->output_segment()->vaddr(); | |
5565 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
5566 | origin = gsym->output_data()->address(); | |
5567 | else | |
5568 | { | |
5569 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5570 | _("cannot find origin of R_ARM_BASE_PREL")); | |
5571 | return true; | |
5572 | } | |
5573 | reloc_status = Arm_relocate_functions::base_prel(view, origin, address); | |
5574 | } | |
5575 | break; | |
5576 | ||
be8fcb75 ILT |
5577 | case elfcpp::R_ARM_BASE_ABS: |
5578 | { | |
5579 | if (!should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5580 | output_section)) | |
5581 | break; | |
5582 | ||
5583 | uint32_t origin; | |
5584 | // Get the addressing origin of the output segment defining | |
5585 | // the symbol gsym (AAELF 4.6.1.2 Relocation types). | |
5586 | if (gsym == NULL) | |
5587 | // R_ARM_BASE_ABS with the NULL symbol will give the | |
5588 | // absolute address of the GOT origin (GOT_ORG) (see ARM IHI | |
5589 | // 0044C (AAELF): 4.6.1.8 Proxy generating relocations). | |
5590 | origin = target->got_plt_section()->address(); | |
5591 | else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
5592 | origin = gsym->output_segment()->vaddr(); | |
5593 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
5594 | origin = gsym->output_data()->address(); | |
5595 | else | |
5596 | { | |
5597 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5598 | _("cannot find origin of R_ARM_BASE_ABS")); | |
5599 | return true; | |
5600 | } | |
5601 | ||
5602 | reloc_status = Arm_relocate_functions::base_abs(view, origin); | |
5603 | } | |
5604 | break; | |
5605 | ||
c121c671 DK |
5606 | case elfcpp::R_ARM_GOT_BREL: |
5607 | gold_assert(have_got_offset); | |
5608 | reloc_status = Arm_relocate_functions::got_brel(view, got_offset); | |
5609 | break; | |
5610 | ||
7f5309a5 ILT |
5611 | case elfcpp::R_ARM_GOT_PREL: |
5612 | gold_assert(have_got_offset); | |
5613 | // Get the address origin for GOT PLT, which is allocated right | |
5614 | // after the GOT section, to calculate an absolute address of | |
5615 | // the symbol GOT entry (got_origin + got_offset). | |
ebabffbd | 5616 | Arm_address got_origin; |
7f5309a5 ILT |
5617 | got_origin = target->got_plt_section()->address(); |
5618 | reloc_status = Arm_relocate_functions::got_prel(view, | |
5619 | got_origin + got_offset, | |
5620 | address); | |
5621 | break; | |
5622 | ||
c121c671 DK |
5623 | case elfcpp::R_ARM_PLT32: |
5624 | gold_assert(gsym == NULL | |
5625 | || gsym->has_plt_offset() | |
5626 | || gsym->final_value_is_known() | |
5627 | || (gsym->is_defined() | |
5628 | && !gsym->is_from_dynobj() | |
5629 | && !gsym->is_preemptible())); | |
d204b6e9 DK |
5630 | reloc_status = |
5631 | Arm_relocate_functions::plt32(relinfo, view, gsym, object, r_sym, | |
5632 | psymval, address, thumb_bit, | |
5633 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5634 | break; |
5635 | ||
5636 | case elfcpp::R_ARM_CALL: | |
d204b6e9 DK |
5637 | reloc_status = |
5638 | Arm_relocate_functions::call(relinfo, view, gsym, object, r_sym, | |
5639 | psymval, address, thumb_bit, | |
5640 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5641 | break; |
5642 | ||
5643 | case elfcpp::R_ARM_JUMP24: | |
d204b6e9 DK |
5644 | reloc_status = |
5645 | Arm_relocate_functions::jump24(relinfo, view, gsym, object, r_sym, | |
5646 | psymval, address, thumb_bit, | |
5647 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5648 | break; |
5649 | ||
51938283 DK |
5650 | case elfcpp::R_ARM_THM_JUMP24: |
5651 | reloc_status = | |
5652 | Arm_relocate_functions::thm_jump24(relinfo, view, gsym, object, r_sym, | |
5653 | psymval, address, thumb_bit, | |
5654 | is_weakly_undefined_without_plt); | |
5655 | break; | |
5656 | ||
c121c671 DK |
5657 | case elfcpp::R_ARM_PREL31: |
5658 | reloc_status = Arm_relocate_functions::prel31(view, object, psymval, | |
2daedcd6 | 5659 | address, thumb_bit); |
c121c671 DK |
5660 | break; |
5661 | ||
5662 | case elfcpp::R_ARM_TARGET1: | |
5663 | // This should have been mapped to another type already. | |
5664 | // Fall through. | |
5665 | case elfcpp::R_ARM_COPY: | |
5666 | case elfcpp::R_ARM_GLOB_DAT: | |
5667 | case elfcpp::R_ARM_JUMP_SLOT: | |
5668 | case elfcpp::R_ARM_RELATIVE: | |
5669 | // These are relocations which should only be seen by the | |
5670 | // dynamic linker, and should never be seen here. | |
5671 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5672 | _("unexpected reloc %u in object file"), | |
5673 | r_type); | |
5674 | break; | |
5675 | ||
5676 | default: | |
5677 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5678 | _("unsupported reloc %u"), | |
5679 | r_type); | |
5680 | break; | |
5681 | } | |
5682 | ||
5683 | // Report any errors. | |
5684 | switch (reloc_status) | |
5685 | { | |
5686 | case Arm_relocate_functions::STATUS_OKAY: | |
5687 | break; | |
5688 | case Arm_relocate_functions::STATUS_OVERFLOW: | |
5689 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5690 | _("relocation overflow in relocation %u"), | |
5691 | r_type); | |
5692 | break; | |
5693 | case Arm_relocate_functions::STATUS_BAD_RELOC: | |
5694 | gold_error_at_location( | |
5695 | relinfo, | |
5696 | relnum, | |
5697 | rel.get_r_offset(), | |
5698 | _("unexpected opcode while processing relocation %u"), | |
5699 | r_type); | |
5700 | break; | |
4a657b0d DK |
5701 | default: |
5702 | gold_unreachable(); | |
5703 | } | |
5704 | ||
5705 | return true; | |
5706 | } | |
5707 | ||
5708 | // Relocate section data. | |
5709 | ||
5710 | template<bool big_endian> | |
5711 | void | |
5712 | Target_arm<big_endian>::relocate_section( | |
5713 | const Relocate_info<32, big_endian>* relinfo, | |
5714 | unsigned int sh_type, | |
5715 | const unsigned char* prelocs, | |
5716 | size_t reloc_count, | |
5717 | Output_section* output_section, | |
5718 | bool needs_special_offset_handling, | |
5719 | unsigned char* view, | |
ebabffbd | 5720 | Arm_address address, |
364c7fa5 ILT |
5721 | section_size_type view_size, |
5722 | const Reloc_symbol_changes* reloc_symbol_changes) | |
4a657b0d DK |
5723 | { |
5724 | typedef typename Target_arm<big_endian>::Relocate Arm_relocate; | |
5725 | gold_assert(sh_type == elfcpp::SHT_REL); | |
5726 | ||
43d12afe DK |
5727 | Arm_input_section<big_endian>* arm_input_section = |
5728 | this->find_arm_input_section(relinfo->object, relinfo->data_shndx); | |
5729 | ||
5730 | // This is an ARM input section and the view covers the whole output | |
5731 | // section. | |
5732 | if (arm_input_section != NULL) | |
5733 | { | |
5734 | gold_assert(needs_special_offset_handling); | |
5735 | Arm_address section_address = arm_input_section->address(); | |
5736 | section_size_type section_size = arm_input_section->data_size(); | |
5737 | ||
5738 | gold_assert((arm_input_section->address() >= address) | |
5739 | && ((arm_input_section->address() | |
5740 | + arm_input_section->data_size()) | |
5741 | <= (address + view_size))); | |
5742 | ||
2ea97941 ILT |
5743 | off_t offset = section_address - address; |
5744 | view += offset; | |
5745 | address += offset; | |
43d12afe DK |
5746 | view_size = section_size; |
5747 | } | |
5748 | ||
4a657b0d DK |
5749 | gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL, |
5750 | Arm_relocate>( | |
5751 | relinfo, | |
5752 | this, | |
5753 | prelocs, | |
5754 | reloc_count, | |
5755 | output_section, | |
5756 | needs_special_offset_handling, | |
5757 | view, | |
5758 | address, | |
364c7fa5 ILT |
5759 | view_size, |
5760 | reloc_symbol_changes); | |
4a657b0d DK |
5761 | } |
5762 | ||
5763 | // Return the size of a relocation while scanning during a relocatable | |
5764 | // link. | |
5765 | ||
5766 | template<bool big_endian> | |
5767 | unsigned int | |
5768 | Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
5769 | unsigned int r_type, | |
5770 | Relobj* object) | |
5771 | { | |
a6d1ef57 | 5772 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
5773 | switch (r_type) |
5774 | { | |
5775 | case elfcpp::R_ARM_NONE: | |
5776 | return 0; | |
5777 | ||
5e445df6 ILT |
5778 | case elfcpp::R_ARM_ABS8: |
5779 | return 1; | |
5780 | ||
be8fcb75 ILT |
5781 | case elfcpp::R_ARM_ABS16: |
5782 | case elfcpp::R_ARM_THM_ABS5: | |
5783 | return 2; | |
5784 | ||
4a657b0d | 5785 | case elfcpp::R_ARM_ABS32: |
be8fcb75 ILT |
5786 | case elfcpp::R_ARM_ABS32_NOI: |
5787 | case elfcpp::R_ARM_ABS12: | |
5788 | case elfcpp::R_ARM_BASE_ABS: | |
4a657b0d DK |
5789 | case elfcpp::R_ARM_REL32: |
5790 | case elfcpp::R_ARM_THM_CALL: | |
5791 | case elfcpp::R_ARM_GOTOFF32: | |
5792 | case elfcpp::R_ARM_BASE_PREL: | |
5793 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5794 | case elfcpp::R_ARM_GOT_PREL: |
4a657b0d DK |
5795 | case elfcpp::R_ARM_PLT32: |
5796 | case elfcpp::R_ARM_CALL: | |
5797 | case elfcpp::R_ARM_JUMP24: | |
5798 | case elfcpp::R_ARM_PREL31: | |
fd3c5f0b ILT |
5799 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5800 | case elfcpp::R_ARM_MOVT_ABS: | |
5801 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5802 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
5803 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5804 | case elfcpp::R_ARM_MOVT_PREL: | |
5805 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5806 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
4a657b0d DK |
5807 | return 4; |
5808 | ||
5809 | case elfcpp::R_ARM_TARGET1: | |
5810 | // This should have been mapped to another type already. | |
5811 | // Fall through. | |
5812 | case elfcpp::R_ARM_COPY: | |
5813 | case elfcpp::R_ARM_GLOB_DAT: | |
5814 | case elfcpp::R_ARM_JUMP_SLOT: | |
5815 | case elfcpp::R_ARM_RELATIVE: | |
5816 | // These are relocations which should only be seen by the | |
5817 | // dynamic linker, and should never be seen here. | |
5818 | gold_error(_("%s: unexpected reloc %u in object file"), | |
5819 | object->name().c_str(), r_type); | |
5820 | return 0; | |
5821 | ||
5822 | default: | |
5823 | object->error(_("unsupported reloc %u in object file"), r_type); | |
5824 | return 0; | |
5825 | } | |
5826 | } | |
5827 | ||
5828 | // Scan the relocs during a relocatable link. | |
5829 | ||
5830 | template<bool big_endian> | |
5831 | void | |
5832 | Target_arm<big_endian>::scan_relocatable_relocs( | |
4a657b0d | 5833 | Symbol_table* symtab, |
2ea97941 | 5834 | Layout* layout, |
4a657b0d DK |
5835 | Sized_relobj<32, big_endian>* object, |
5836 | unsigned int data_shndx, | |
5837 | unsigned int sh_type, | |
5838 | const unsigned char* prelocs, | |
5839 | size_t reloc_count, | |
5840 | Output_section* output_section, | |
5841 | bool needs_special_offset_handling, | |
5842 | size_t local_symbol_count, | |
5843 | const unsigned char* plocal_symbols, | |
5844 | Relocatable_relocs* rr) | |
5845 | { | |
5846 | gold_assert(sh_type == elfcpp::SHT_REL); | |
5847 | ||
5848 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
5849 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
5850 | ||
5851 | gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL, | |
5852 | Scan_relocatable_relocs>( | |
4a657b0d | 5853 | symtab, |
2ea97941 | 5854 | layout, |
4a657b0d DK |
5855 | object, |
5856 | data_shndx, | |
5857 | prelocs, | |
5858 | reloc_count, | |
5859 | output_section, | |
5860 | needs_special_offset_handling, | |
5861 | local_symbol_count, | |
5862 | plocal_symbols, | |
5863 | rr); | |
5864 | } | |
5865 | ||
5866 | // Relocate a section during a relocatable link. | |
5867 | ||
5868 | template<bool big_endian> | |
5869 | void | |
5870 | Target_arm<big_endian>::relocate_for_relocatable( | |
5871 | const Relocate_info<32, big_endian>* relinfo, | |
5872 | unsigned int sh_type, | |
5873 | const unsigned char* prelocs, | |
5874 | size_t reloc_count, | |
5875 | Output_section* output_section, | |
5876 | off_t offset_in_output_section, | |
5877 | const Relocatable_relocs* rr, | |
5878 | unsigned char* view, | |
ebabffbd | 5879 | Arm_address view_address, |
4a657b0d DK |
5880 | section_size_type view_size, |
5881 | unsigned char* reloc_view, | |
5882 | section_size_type reloc_view_size) | |
5883 | { | |
5884 | gold_assert(sh_type == elfcpp::SHT_REL); | |
5885 | ||
5886 | gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>( | |
5887 | relinfo, | |
5888 | prelocs, | |
5889 | reloc_count, | |
5890 | output_section, | |
5891 | offset_in_output_section, | |
5892 | rr, | |
5893 | view, | |
5894 | view_address, | |
5895 | view_size, | |
5896 | reloc_view, | |
5897 | reloc_view_size); | |
5898 | } | |
5899 | ||
94cdfcff DK |
5900 | // Return the value to use for a dynamic symbol which requires special |
5901 | // treatment. This is how we support equality comparisons of function | |
5902 | // pointers across shared library boundaries, as described in the | |
5903 | // processor specific ABI supplement. | |
5904 | ||
4a657b0d DK |
5905 | template<bool big_endian> |
5906 | uint64_t | |
94cdfcff | 5907 | Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const |
4a657b0d | 5908 | { |
94cdfcff DK |
5909 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
5910 | return this->plt_section()->address() + gsym->plt_offset(); | |
4a657b0d DK |
5911 | } |
5912 | ||
5913 | // Map platform-specific relocs to real relocs | |
5914 | // | |
5915 | template<bool big_endian> | |
5916 | unsigned int | |
a6d1ef57 | 5917 | Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type) |
4a657b0d DK |
5918 | { |
5919 | switch (r_type) | |
5920 | { | |
5921 | case elfcpp::R_ARM_TARGET1: | |
a6d1ef57 DK |
5922 | // This is either R_ARM_ABS32 or R_ARM_REL32; |
5923 | return elfcpp::R_ARM_ABS32; | |
4a657b0d DK |
5924 | |
5925 | case elfcpp::R_ARM_TARGET2: | |
a6d1ef57 DK |
5926 | // This can be any reloc type but ususally is R_ARM_GOT_PREL |
5927 | return elfcpp::R_ARM_GOT_PREL; | |
4a657b0d DK |
5928 | |
5929 | default: | |
5930 | return r_type; | |
5931 | } | |
5932 | } | |
5933 | ||
d5b40221 DK |
5934 | // Whether if two EABI versions V1 and V2 are compatible. |
5935 | ||
5936 | template<bool big_endian> | |
5937 | bool | |
5938 | Target_arm<big_endian>::are_eabi_versions_compatible( | |
5939 | elfcpp::Elf_Word v1, | |
5940 | elfcpp::Elf_Word v2) | |
5941 | { | |
5942 | // v4 and v5 are the same spec before and after it was released, | |
5943 | // so allow mixing them. | |
5944 | if ((v1 == elfcpp::EF_ARM_EABI_VER4 && v2 == elfcpp::EF_ARM_EABI_VER5) | |
5945 | || (v1 == elfcpp::EF_ARM_EABI_VER5 && v2 == elfcpp::EF_ARM_EABI_VER4)) | |
5946 | return true; | |
5947 | ||
5948 | return v1 == v2; | |
5949 | } | |
5950 | ||
5951 | // Combine FLAGS from an input object called NAME and the processor-specific | |
5952 | // flags in the ELF header of the output. Much of this is adapted from the | |
5953 | // processor-specific flags merging code in elf32_arm_merge_private_bfd_data | |
5954 | // in bfd/elf32-arm.c. | |
5955 | ||
5956 | template<bool big_endian> | |
5957 | void | |
5958 | Target_arm<big_endian>::merge_processor_specific_flags( | |
5959 | const std::string& name, | |
5960 | elfcpp::Elf_Word flags) | |
5961 | { | |
5962 | if (this->are_processor_specific_flags_set()) | |
5963 | { | |
5964 | elfcpp::Elf_Word out_flags = this->processor_specific_flags(); | |
5965 | ||
5966 | // Nothing to merge if flags equal to those in output. | |
5967 | if (flags == out_flags) | |
5968 | return; | |
5969 | ||
5970 | // Complain about various flag mismatches. | |
5971 | elfcpp::Elf_Word version1 = elfcpp::arm_eabi_version(flags); | |
5972 | elfcpp::Elf_Word version2 = elfcpp::arm_eabi_version(out_flags); | |
5973 | if (!this->are_eabi_versions_compatible(version1, version2)) | |
5974 | gold_error(_("Source object %s has EABI version %d but output has " | |
5975 | "EABI version %d."), | |
5976 | name.c_str(), | |
5977 | (flags & elfcpp::EF_ARM_EABIMASK) >> 24, | |
5978 | (out_flags & elfcpp::EF_ARM_EABIMASK) >> 24); | |
5979 | } | |
5980 | else | |
5981 | { | |
5982 | // If the input is the default architecture and had the default | |
5983 | // flags then do not bother setting the flags for the output | |
5984 | // architecture, instead allow future merges to do this. If no | |
5985 | // future merges ever set these flags then they will retain their | |
5986 | // uninitialised values, which surprise surprise, correspond | |
5987 | // to the default values. | |
5988 | if (flags == 0) | |
5989 | return; | |
5990 | ||
5991 | // This is the first time, just copy the flags. | |
5992 | // We only copy the EABI version for now. | |
5993 | this->set_processor_specific_flags(flags & elfcpp::EF_ARM_EABIMASK); | |
5994 | } | |
5995 | } | |
5996 | ||
5997 | // Adjust ELF file header. | |
5998 | template<bool big_endian> | |
5999 | void | |
6000 | Target_arm<big_endian>::do_adjust_elf_header( | |
6001 | unsigned char* view, | |
6002 | int len) const | |
6003 | { | |
6004 | gold_assert(len == elfcpp::Elf_sizes<32>::ehdr_size); | |
6005 | ||
6006 | elfcpp::Ehdr<32, big_endian> ehdr(view); | |
6007 | unsigned char e_ident[elfcpp::EI_NIDENT]; | |
6008 | memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); | |
6009 | ||
6010 | if (elfcpp::arm_eabi_version(this->processor_specific_flags()) | |
6011 | == elfcpp::EF_ARM_EABI_UNKNOWN) | |
6012 | e_ident[elfcpp::EI_OSABI] = elfcpp::ELFOSABI_ARM; | |
6013 | else | |
6014 | e_ident[elfcpp::EI_OSABI] = 0; | |
6015 | e_ident[elfcpp::EI_ABIVERSION] = 0; | |
6016 | ||
6017 | // FIXME: Do EF_ARM_BE8 adjustment. | |
6018 | ||
6019 | elfcpp::Ehdr_write<32, big_endian> oehdr(view); | |
6020 | oehdr.put_e_ident(e_ident); | |
6021 | } | |
6022 | ||
6023 | // do_make_elf_object to override the same function in the base class. | |
6024 | // We need to use a target-specific sub-class of Sized_relobj<32, big_endian> | |
6025 | // to store ARM specific information. Hence we need to have our own | |
6026 | // ELF object creation. | |
6027 | ||
6028 | template<bool big_endian> | |
6029 | Object* | |
6030 | Target_arm<big_endian>::do_make_elf_object( | |
6031 | const std::string& name, | |
6032 | Input_file* input_file, | |
2ea97941 | 6033 | off_t offset, const elfcpp::Ehdr<32, big_endian>& ehdr) |
d5b40221 DK |
6034 | { |
6035 | int et = ehdr.get_e_type(); | |
6036 | if (et == elfcpp::ET_REL) | |
6037 | { | |
6038 | Arm_relobj<big_endian>* obj = | |
2ea97941 | 6039 | new Arm_relobj<big_endian>(name, input_file, offset, ehdr); |
d5b40221 DK |
6040 | obj->setup(); |
6041 | return obj; | |
6042 | } | |
6043 | else if (et == elfcpp::ET_DYN) | |
6044 | { | |
6045 | Sized_dynobj<32, big_endian>* obj = | |
2ea97941 | 6046 | new Arm_dynobj<big_endian>(name, input_file, offset, ehdr); |
d5b40221 DK |
6047 | obj->setup(); |
6048 | return obj; | |
6049 | } | |
6050 | else | |
6051 | { | |
6052 | gold_error(_("%s: unsupported ELF file type %d"), | |
6053 | name.c_str(), et); | |
6054 | return NULL; | |
6055 | } | |
6056 | } | |
6057 | ||
a0351a69 DK |
6058 | // Read the architecture from the Tag_also_compatible_with attribute, if any. |
6059 | // Returns -1 if no architecture could be read. | |
6060 | // This is adapted from get_secondary_compatible_arch() in bfd/elf32-arm.c. | |
6061 | ||
6062 | template<bool big_endian> | |
6063 | int | |
6064 | Target_arm<big_endian>::get_secondary_compatible_arch( | |
6065 | const Attributes_section_data* pasd) | |
6066 | { | |
6067 | const Object_attribute *known_attributes = | |
6068 | pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC); | |
6069 | ||
6070 | // Note: the tag and its argument below are uleb128 values, though | |
6071 | // currently-defined values fit in one byte for each. | |
6072 | const std::string& sv = | |
6073 | known_attributes[elfcpp::Tag_also_compatible_with].string_value(); | |
6074 | if (sv.size() == 2 | |
6075 | && sv.data()[0] == elfcpp::Tag_CPU_arch | |
6076 | && (sv.data()[1] & 128) != 128) | |
6077 | return sv.data()[1]; | |
6078 | ||
6079 | // This tag is "safely ignorable", so don't complain if it looks funny. | |
6080 | return -1; | |
6081 | } | |
6082 | ||
6083 | // Set, or unset, the architecture of the Tag_also_compatible_with attribute. | |
6084 | // The tag is removed if ARCH is -1. | |
6085 | // This is adapted from set_secondary_compatible_arch() in bfd/elf32-arm.c. | |
6086 | ||
6087 | template<bool big_endian> | |
6088 | void | |
6089 | Target_arm<big_endian>::set_secondary_compatible_arch( | |
6090 | Attributes_section_data* pasd, | |
6091 | int arch) | |
6092 | { | |
6093 | Object_attribute *known_attributes = | |
6094 | pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC); | |
6095 | ||
6096 | if (arch == -1) | |
6097 | { | |
6098 | known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(""); | |
6099 | return; | |
6100 | } | |
6101 | ||
6102 | // Note: the tag and its argument below are uleb128 values, though | |
6103 | // currently-defined values fit in one byte for each. | |
6104 | char sv[3]; | |
6105 | sv[0] = elfcpp::Tag_CPU_arch; | |
6106 | gold_assert(arch != 0); | |
6107 | sv[1] = arch; | |
6108 | sv[2] = '\0'; | |
6109 | ||
6110 | known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(sv); | |
6111 | } | |
6112 | ||
6113 | // Combine two values for Tag_CPU_arch, taking secondary compatibility tags | |
6114 | // into account. | |
6115 | // This is adapted from tag_cpu_arch_combine() in bfd/elf32-arm.c. | |
6116 | ||
6117 | template<bool big_endian> | |
6118 | int | |
6119 | Target_arm<big_endian>::tag_cpu_arch_combine( | |
6120 | const char* name, | |
6121 | int oldtag, | |
6122 | int* secondary_compat_out, | |
6123 | int newtag, | |
6124 | int secondary_compat) | |
6125 | { | |
6126 | #define T(X) elfcpp::TAG_CPU_ARCH_##X | |
6127 | static const int v6t2[] = | |
6128 | { | |
6129 | T(V6T2), // PRE_V4. | |
6130 | T(V6T2), // V4. | |
6131 | T(V6T2), // V4T. | |
6132 | T(V6T2), // V5T. | |
6133 | T(V6T2), // V5TE. | |
6134 | T(V6T2), // V5TEJ. | |
6135 | T(V6T2), // V6. | |
6136 | T(V7), // V6KZ. | |
6137 | T(V6T2) // V6T2. | |
6138 | }; | |
6139 | static const int v6k[] = | |
6140 | { | |
6141 | T(V6K), // PRE_V4. | |
6142 | T(V6K), // V4. | |
6143 | T(V6K), // V4T. | |
6144 | T(V6K), // V5T. | |
6145 | T(V6K), // V5TE. | |
6146 | T(V6K), // V5TEJ. | |
6147 | T(V6K), // V6. | |
6148 | T(V6KZ), // V6KZ. | |
6149 | T(V7), // V6T2. | |
6150 | T(V6K) // V6K. | |
6151 | }; | |
6152 | static const int v7[] = | |
6153 | { | |
6154 | T(V7), // PRE_V4. | |
6155 | T(V7), // V4. | |
6156 | T(V7), // V4T. | |
6157 | T(V7), // V5T. | |
6158 | T(V7), // V5TE. | |
6159 | T(V7), // V5TEJ. | |
6160 | T(V7), // V6. | |
6161 | T(V7), // V6KZ. | |
6162 | T(V7), // V6T2. | |
6163 | T(V7), // V6K. | |
6164 | T(V7) // V7. | |
6165 | }; | |
6166 | static const int v6_m[] = | |
6167 | { | |
6168 | -1, // PRE_V4. | |
6169 | -1, // V4. | |
6170 | T(V6K), // V4T. | |
6171 | T(V6K), // V5T. | |
6172 | T(V6K), // V5TE. | |
6173 | T(V6K), // V5TEJ. | |
6174 | T(V6K), // V6. | |
6175 | T(V6KZ), // V6KZ. | |
6176 | T(V7), // V6T2. | |
6177 | T(V6K), // V6K. | |
6178 | T(V7), // V7. | |
6179 | T(V6_M) // V6_M. | |
6180 | }; | |
6181 | static const int v6s_m[] = | |
6182 | { | |
6183 | -1, // PRE_V4. | |
6184 | -1, // V4. | |
6185 | T(V6K), // V4T. | |
6186 | T(V6K), // V5T. | |
6187 | T(V6K), // V5TE. | |
6188 | T(V6K), // V5TEJ. | |
6189 | T(V6K), // V6. | |
6190 | T(V6KZ), // V6KZ. | |
6191 | T(V7), // V6T2. | |
6192 | T(V6K), // V6K. | |
6193 | T(V7), // V7. | |
6194 | T(V6S_M), // V6_M. | |
6195 | T(V6S_M) // V6S_M. | |
6196 | }; | |
6197 | static const int v7e_m[] = | |
6198 | { | |
6199 | -1, // PRE_V4. | |
6200 | -1, // V4. | |
6201 | T(V7E_M), // V4T. | |
6202 | T(V7E_M), // V5T. | |
6203 | T(V7E_M), // V5TE. | |
6204 | T(V7E_M), // V5TEJ. | |
6205 | T(V7E_M), // V6. | |
6206 | T(V7E_M), // V6KZ. | |
6207 | T(V7E_M), // V6T2. | |
6208 | T(V7E_M), // V6K. | |
6209 | T(V7E_M), // V7. | |
6210 | T(V7E_M), // V6_M. | |
6211 | T(V7E_M), // V6S_M. | |
6212 | T(V7E_M) // V7E_M. | |
6213 | }; | |
6214 | static const int v4t_plus_v6_m[] = | |
6215 | { | |
6216 | -1, // PRE_V4. | |
6217 | -1, // V4. | |
6218 | T(V4T), // V4T. | |
6219 | T(V5T), // V5T. | |
6220 | T(V5TE), // V5TE. | |
6221 | T(V5TEJ), // V5TEJ. | |
6222 | T(V6), // V6. | |
6223 | T(V6KZ), // V6KZ. | |
6224 | T(V6T2), // V6T2. | |
6225 | T(V6K), // V6K. | |
6226 | T(V7), // V7. | |
6227 | T(V6_M), // V6_M. | |
6228 | T(V6S_M), // V6S_M. | |
6229 | T(V7E_M), // V7E_M. | |
6230 | T(V4T_PLUS_V6_M) // V4T plus V6_M. | |
6231 | }; | |
6232 | static const int *comb[] = | |
6233 | { | |
6234 | v6t2, | |
6235 | v6k, | |
6236 | v7, | |
6237 | v6_m, | |
6238 | v6s_m, | |
6239 | v7e_m, | |
6240 | // Pseudo-architecture. | |
6241 | v4t_plus_v6_m | |
6242 | }; | |
6243 | ||
6244 | // Check we've not got a higher architecture than we know about. | |
6245 | ||
6246 | if (oldtag >= elfcpp::MAX_TAG_CPU_ARCH || newtag >= elfcpp::MAX_TAG_CPU_ARCH) | |
6247 | { | |
6248 | gold_error(_("%s: unknown CPU architecture"), name); | |
6249 | return -1; | |
6250 | } | |
6251 | ||
6252 | // Override old tag if we have a Tag_also_compatible_with on the output. | |
6253 | ||
6254 | if ((oldtag == T(V6_M) && *secondary_compat_out == T(V4T)) | |
6255 | || (oldtag == T(V4T) && *secondary_compat_out == T(V6_M))) | |
6256 | oldtag = T(V4T_PLUS_V6_M); | |
6257 | ||
6258 | // And override the new tag if we have a Tag_also_compatible_with on the | |
6259 | // input. | |
6260 | ||
6261 | if ((newtag == T(V6_M) && secondary_compat == T(V4T)) | |
6262 | || (newtag == T(V4T) && secondary_compat == T(V6_M))) | |
6263 | newtag = T(V4T_PLUS_V6_M); | |
6264 | ||
6265 | // Architectures before V6KZ add features monotonically. | |
6266 | int tagh = std::max(oldtag, newtag); | |
6267 | if (tagh <= elfcpp::TAG_CPU_ARCH_V6KZ) | |
6268 | return tagh; | |
6269 | ||
6270 | int tagl = std::min(oldtag, newtag); | |
6271 | int result = comb[tagh - T(V6T2)][tagl]; | |
6272 | ||
6273 | // Use Tag_CPU_arch == V4T and Tag_also_compatible_with (Tag_CPU_arch V6_M) | |
6274 | // as the canonical version. | |
6275 | if (result == T(V4T_PLUS_V6_M)) | |
6276 | { | |
6277 | result = T(V4T); | |
6278 | *secondary_compat_out = T(V6_M); | |
6279 | } | |
6280 | else | |
6281 | *secondary_compat_out = -1; | |
6282 | ||
6283 | if (result == -1) | |
6284 | { | |
6285 | gold_error(_("%s: conflicting CPU architectures %d/%d"), | |
6286 | name, oldtag, newtag); | |
6287 | return -1; | |
6288 | } | |
6289 | ||
6290 | return result; | |
6291 | #undef T | |
6292 | } | |
6293 | ||
6294 | // Helper to print AEABI enum tag value. | |
6295 | ||
6296 | template<bool big_endian> | |
6297 | std::string | |
6298 | Target_arm<big_endian>::aeabi_enum_name(unsigned int value) | |
6299 | { | |
6300 | static const char *aeabi_enum_names[] = | |
6301 | { "", "variable-size", "32-bit", "" }; | |
6302 | const size_t aeabi_enum_names_size = | |
6303 | sizeof(aeabi_enum_names) / sizeof(aeabi_enum_names[0]); | |
6304 | ||
6305 | if (value < aeabi_enum_names_size) | |
6306 | return std::string(aeabi_enum_names[value]); | |
6307 | else | |
6308 | { | |
6309 | char buffer[100]; | |
6310 | sprintf(buffer, "<unknown value %u>", value); | |
6311 | return std::string(buffer); | |
6312 | } | |
6313 | } | |
6314 | ||
6315 | // Return the string value to store in TAG_CPU_name. | |
6316 | ||
6317 | template<bool big_endian> | |
6318 | std::string | |
6319 | Target_arm<big_endian>::tag_cpu_name_value(unsigned int value) | |
6320 | { | |
6321 | static const char *name_table[] = { | |
6322 | // These aren't real CPU names, but we can't guess | |
6323 | // that from the architecture version alone. | |
6324 | "Pre v4", | |
6325 | "ARM v4", | |
6326 | "ARM v4T", | |
6327 | "ARM v5T", | |
6328 | "ARM v5TE", | |
6329 | "ARM v5TEJ", | |
6330 | "ARM v6", | |
6331 | "ARM v6KZ", | |
6332 | "ARM v6T2", | |
6333 | "ARM v6K", | |
6334 | "ARM v7", | |
6335 | "ARM v6-M", | |
6336 | "ARM v6S-M", | |
6337 | "ARM v7E-M" | |
6338 | }; | |
6339 | const size_t name_table_size = sizeof(name_table) / sizeof(name_table[0]); | |
6340 | ||
6341 | if (value < name_table_size) | |
6342 | return std::string(name_table[value]); | |
6343 | else | |
6344 | { | |
6345 | char buffer[100]; | |
6346 | sprintf(buffer, "<unknown CPU value %u>", value); | |
6347 | return std::string(buffer); | |
6348 | } | |
6349 | } | |
6350 | ||
6351 | // Merge object attributes from input file called NAME with those of the | |
6352 | // output. The input object attributes are in the object pointed by PASD. | |
6353 | ||
6354 | template<bool big_endian> | |
6355 | void | |
6356 | Target_arm<big_endian>::merge_object_attributes( | |
6357 | const char* name, | |
6358 | const Attributes_section_data* pasd) | |
6359 | { | |
6360 | // Return if there is no attributes section data. | |
6361 | if (pasd == NULL) | |
6362 | return; | |
6363 | ||
6364 | // If output has no object attributes, just copy. | |
6365 | if (this->attributes_section_data_ == NULL) | |
6366 | { | |
6367 | this->attributes_section_data_ = new Attributes_section_data(*pasd); | |
6368 | return; | |
6369 | } | |
6370 | ||
6371 | const int vendor = Object_attribute::OBJ_ATTR_PROC; | |
6372 | const Object_attribute* in_attr = pasd->known_attributes(vendor); | |
6373 | Object_attribute* out_attr = | |
6374 | this->attributes_section_data_->known_attributes(vendor); | |
6375 | ||
6376 | // This needs to happen before Tag_ABI_FP_number_model is merged. */ | |
6377 | if (in_attr[elfcpp::Tag_ABI_VFP_args].int_value() | |
6378 | != out_attr[elfcpp::Tag_ABI_VFP_args].int_value()) | |
6379 | { | |
6380 | // Ignore mismatches if the object doesn't use floating point. */ | |
6381 | if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0) | |
6382 | out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value( | |
6383 | in_attr[elfcpp::Tag_ABI_VFP_args].int_value()); | |
6384 | else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0) | |
6385 | gold_error(_("%s uses VFP register arguments, output does not"), | |
6386 | name); | |
6387 | } | |
6388 | ||
6389 | for (int i = 4; i < Vendor_object_attributes::NUM_KNOWN_ATTRIBUTES; ++i) | |
6390 | { | |
6391 | // Merge this attribute with existing attributes. | |
6392 | switch (i) | |
6393 | { | |
6394 | case elfcpp::Tag_CPU_raw_name: | |
6395 | case elfcpp::Tag_CPU_name: | |
6396 | // These are merged after Tag_CPU_arch. | |
6397 | break; | |
6398 | ||
6399 | case elfcpp::Tag_ABI_optimization_goals: | |
6400 | case elfcpp::Tag_ABI_FP_optimization_goals: | |
6401 | // Use the first value seen. | |
6402 | break; | |
6403 | ||
6404 | case elfcpp::Tag_CPU_arch: | |
6405 | { | |
6406 | unsigned int saved_out_attr = out_attr->int_value(); | |
6407 | // Merge Tag_CPU_arch and Tag_also_compatible_with. | |
6408 | int secondary_compat = | |
6409 | this->get_secondary_compatible_arch(pasd); | |
6410 | int secondary_compat_out = | |
6411 | this->get_secondary_compatible_arch( | |
6412 | this->attributes_section_data_); | |
6413 | out_attr[i].set_int_value( | |
6414 | tag_cpu_arch_combine(name, out_attr[i].int_value(), | |
6415 | &secondary_compat_out, | |
6416 | in_attr[i].int_value(), | |
6417 | secondary_compat)); | |
6418 | this->set_secondary_compatible_arch(this->attributes_section_data_, | |
6419 | secondary_compat_out); | |
6420 | ||
6421 | // Merge Tag_CPU_name and Tag_CPU_raw_name. | |
6422 | if (out_attr[i].int_value() == saved_out_attr) | |
6423 | ; // Leave the names alone. | |
6424 | else if (out_attr[i].int_value() == in_attr[i].int_value()) | |
6425 | { | |
6426 | // The output architecture has been changed to match the | |
6427 | // input architecture. Use the input names. | |
6428 | out_attr[elfcpp::Tag_CPU_name].set_string_value( | |
6429 | in_attr[elfcpp::Tag_CPU_name].string_value()); | |
6430 | out_attr[elfcpp::Tag_CPU_raw_name].set_string_value( | |
6431 | in_attr[elfcpp::Tag_CPU_raw_name].string_value()); | |
6432 | } | |
6433 | else | |
6434 | { | |
6435 | out_attr[elfcpp::Tag_CPU_name].set_string_value(""); | |
6436 | out_attr[elfcpp::Tag_CPU_raw_name].set_string_value(""); | |
6437 | } | |
6438 | ||
6439 | // If we still don't have a value for Tag_CPU_name, | |
6440 | // make one up now. Tag_CPU_raw_name remains blank. | |
6441 | if (out_attr[elfcpp::Tag_CPU_name].string_value() == "") | |
6442 | { | |
6443 | const std::string cpu_name = | |
6444 | this->tag_cpu_name_value(out_attr[i].int_value()); | |
6445 | // FIXME: If we see an unknown CPU, this will be set | |
6446 | // to "<unknown CPU n>", where n is the attribute value. | |
6447 | // This is different from BFD, which leaves the name alone. | |
6448 | out_attr[elfcpp::Tag_CPU_name].set_string_value(cpu_name); | |
6449 | } | |
6450 | } | |
6451 | break; | |
6452 | ||
6453 | case elfcpp::Tag_ARM_ISA_use: | |
6454 | case elfcpp::Tag_THUMB_ISA_use: | |
6455 | case elfcpp::Tag_WMMX_arch: | |
6456 | case elfcpp::Tag_Advanced_SIMD_arch: | |
6457 | // ??? Do Advanced_SIMD (NEON) and WMMX conflict? | |
6458 | case elfcpp::Tag_ABI_FP_rounding: | |
6459 | case elfcpp::Tag_ABI_FP_exceptions: | |
6460 | case elfcpp::Tag_ABI_FP_user_exceptions: | |
6461 | case elfcpp::Tag_ABI_FP_number_model: | |
6462 | case elfcpp::Tag_VFP_HP_extension: | |
6463 | case elfcpp::Tag_CPU_unaligned_access: | |
6464 | case elfcpp::Tag_T2EE_use: | |
6465 | case elfcpp::Tag_Virtualization_use: | |
6466 | case elfcpp::Tag_MPextension_use: | |
6467 | // Use the largest value specified. | |
6468 | if (in_attr[i].int_value() > out_attr[i].int_value()) | |
6469 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6470 | break; | |
6471 | ||
6472 | case elfcpp::Tag_ABI_align8_preserved: | |
6473 | case elfcpp::Tag_ABI_PCS_RO_data: | |
6474 | // Use the smallest value specified. | |
6475 | if (in_attr[i].int_value() < out_attr[i].int_value()) | |
6476 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6477 | break; | |
6478 | ||
6479 | case elfcpp::Tag_ABI_align8_needed: | |
6480 | if ((in_attr[i].int_value() > 0 || out_attr[i].int_value() > 0) | |
6481 | && (in_attr[elfcpp::Tag_ABI_align8_preserved].int_value() == 0 | |
6482 | || (out_attr[elfcpp::Tag_ABI_align8_preserved].int_value() | |
6483 | == 0))) | |
6484 | { | |
6485 | // This error message should be enabled once all non-conformant | |
6486 | // binaries in the toolchain have had the attributes set | |
6487 | // properly. | |
6488 | // gold_error(_("output 8-byte data alignment conflicts with %s"), | |
6489 | // name); | |
6490 | } | |
6491 | // Fall through. | |
6492 | case elfcpp::Tag_ABI_FP_denormal: | |
6493 | case elfcpp::Tag_ABI_PCS_GOT_use: | |
6494 | { | |
6495 | // These tags have 0 = don't care, 1 = strong requirement, | |
6496 | // 2 = weak requirement. | |
6497 | static const int order_021[3] = {0, 2, 1}; | |
6498 | ||
6499 | // Use the "greatest" from the sequence 0, 2, 1, or the largest | |
6500 | // value if greater than 2 (for future-proofing). | |
6501 | if ((in_attr[i].int_value() > 2 | |
6502 | && in_attr[i].int_value() > out_attr[i].int_value()) | |
6503 | || (in_attr[i].int_value() <= 2 | |
6504 | && out_attr[i].int_value() <= 2 | |
6505 | && (order_021[in_attr[i].int_value()] | |
6506 | > order_021[out_attr[i].int_value()]))) | |
6507 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6508 | } | |
6509 | break; | |
6510 | ||
6511 | case elfcpp::Tag_CPU_arch_profile: | |
6512 | if (out_attr[i].int_value() != in_attr[i].int_value()) | |
6513 | { | |
6514 | // 0 will merge with anything. | |
6515 | // 'A' and 'S' merge to 'A'. | |
6516 | // 'R' and 'S' merge to 'R'. | |
6517 | // 'M' and 'A|R|S' is an error. | |
6518 | if (out_attr[i].int_value() == 0 | |
6519 | || (out_attr[i].int_value() == 'S' | |
6520 | && (in_attr[i].int_value() == 'A' | |
6521 | || in_attr[i].int_value() == 'R'))) | |
6522 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6523 | else if (in_attr[i].int_value() == 0 | |
6524 | || (in_attr[i].int_value() == 'S' | |
6525 | && (out_attr[i].int_value() == 'A' | |
6526 | || out_attr[i].int_value() == 'R'))) | |
6527 | ; // Do nothing. | |
6528 | else | |
6529 | { | |
6530 | gold_error | |
6531 | (_("conflicting architecture profiles %c/%c"), | |
6532 | in_attr[i].int_value() ? in_attr[i].int_value() : '0', | |
6533 | out_attr[i].int_value() ? out_attr[i].int_value() : '0'); | |
6534 | } | |
6535 | } | |
6536 | break; | |
6537 | case elfcpp::Tag_VFP_arch: | |
6538 | { | |
6539 | static const struct | |
6540 | { | |
6541 | int ver; | |
6542 | int regs; | |
6543 | } vfp_versions[7] = | |
6544 | { | |
6545 | {0, 0}, | |
6546 | {1, 16}, | |
6547 | {2, 16}, | |
6548 | {3, 32}, | |
6549 | {3, 16}, | |
6550 | {4, 32}, | |
6551 | {4, 16} | |
6552 | }; | |
6553 | ||
6554 | // Values greater than 6 aren't defined, so just pick the | |
6555 | // biggest. | |
6556 | if (in_attr[i].int_value() > 6 | |
6557 | && in_attr[i].int_value() > out_attr[i].int_value()) | |
6558 | { | |
6559 | *out_attr = *in_attr; | |
6560 | break; | |
6561 | } | |
6562 | // The output uses the superset of input features | |
6563 | // (ISA version) and registers. | |
6564 | int ver = std::max(vfp_versions[in_attr[i].int_value()].ver, | |
6565 | vfp_versions[out_attr[i].int_value()].ver); | |
6566 | int regs = std::max(vfp_versions[in_attr[i].int_value()].regs, | |
6567 | vfp_versions[out_attr[i].int_value()].regs); | |
6568 | // This assumes all possible supersets are also a valid | |
6569 | // options. | |
6570 | int newval; | |
6571 | for (newval = 6; newval > 0; newval--) | |
6572 | { | |
6573 | if (regs == vfp_versions[newval].regs | |
6574 | && ver == vfp_versions[newval].ver) | |
6575 | break; | |
6576 | } | |
6577 | out_attr[i].set_int_value(newval); | |
6578 | } | |
6579 | break; | |
6580 | case elfcpp::Tag_PCS_config: | |
6581 | if (out_attr[i].int_value() == 0) | |
6582 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6583 | else if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) | |
6584 | { | |
6585 | // It's sometimes ok to mix different configs, so this is only | |
6586 | // a warning. | |
6587 | gold_warning(_("%s: conflicting platform configuration"), name); | |
6588 | } | |
6589 | break; | |
6590 | case elfcpp::Tag_ABI_PCS_R9_use: | |
6591 | if (in_attr[i].int_value() != out_attr[i].int_value() | |
6592 | && out_attr[i].int_value() != elfcpp::AEABI_R9_unused | |
6593 | && in_attr[i].int_value() != elfcpp::AEABI_R9_unused) | |
6594 | { | |
6595 | gold_error(_("%s: conflicting use of R9"), name); | |
6596 | } | |
6597 | if (out_attr[i].int_value() == elfcpp::AEABI_R9_unused) | |
6598 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6599 | break; | |
6600 | case elfcpp::Tag_ABI_PCS_RW_data: | |
6601 | if (in_attr[i].int_value() == elfcpp::AEABI_PCS_RW_data_SBrel | |
6602 | && (in_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() | |
6603 | != elfcpp::AEABI_R9_SB) | |
6604 | && (out_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() | |
6605 | != elfcpp::AEABI_R9_unused)) | |
6606 | { | |
6607 | gold_error(_("%s: SB relative addressing conflicts with use " | |
6608 | "of R9"), | |
6609 | name); | |
6610 | } | |
6611 | // Use the smallest value specified. | |
6612 | if (in_attr[i].int_value() < out_attr[i].int_value()) | |
6613 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6614 | break; | |
6615 | case elfcpp::Tag_ABI_PCS_wchar_t: | |
6616 | // FIXME: Make it possible to turn off this warning. | |
6617 | if (out_attr[i].int_value() | |
6618 | && in_attr[i].int_value() | |
6619 | && out_attr[i].int_value() != in_attr[i].int_value()) | |
6620 | { | |
6621 | gold_warning(_("%s uses %u-byte wchar_t yet the output is to " | |
6622 | "use %u-byte wchar_t; use of wchar_t values " | |
6623 | "across objects may fail"), | |
6624 | name, in_attr[i].int_value(), | |
6625 | out_attr[i].int_value()); | |
6626 | } | |
6627 | else if (in_attr[i].int_value() && !out_attr[i].int_value()) | |
6628 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6629 | break; | |
6630 | case elfcpp::Tag_ABI_enum_size: | |
6631 | if (in_attr[i].int_value() != elfcpp::AEABI_enum_unused) | |
6632 | { | |
6633 | if (out_attr[i].int_value() == elfcpp::AEABI_enum_unused | |
6634 | || out_attr[i].int_value() == elfcpp::AEABI_enum_forced_wide) | |
6635 | { | |
6636 | // The existing object is compatible with anything. | |
6637 | // Use whatever requirements the new object has. | |
6638 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6639 | } | |
6640 | // FIXME: Make it possible to turn off this warning. | |
6641 | else if (in_attr[i].int_value() != elfcpp::AEABI_enum_forced_wide | |
6642 | && out_attr[i].int_value() != in_attr[i].int_value()) | |
6643 | { | |
6644 | unsigned int in_value = in_attr[i].int_value(); | |
6645 | unsigned int out_value = out_attr[i].int_value(); | |
6646 | gold_warning(_("%s uses %s enums yet the output is to use " | |
6647 | "%s enums; use of enum values across objects " | |
6648 | "may fail"), | |
6649 | name, | |
6650 | this->aeabi_enum_name(in_value).c_str(), | |
6651 | this->aeabi_enum_name(out_value).c_str()); | |
6652 | } | |
6653 | } | |
6654 | break; | |
6655 | case elfcpp::Tag_ABI_VFP_args: | |
6656 | // Aready done. | |
6657 | break; | |
6658 | case elfcpp::Tag_ABI_WMMX_args: | |
6659 | if (in_attr[i].int_value() != out_attr[i].int_value()) | |
6660 | { | |
6661 | gold_error(_("%s uses iWMMXt register arguments, output does " | |
6662 | "not"), | |
6663 | name); | |
6664 | } | |
6665 | break; | |
6666 | case Object_attribute::Tag_compatibility: | |
6667 | // Merged in target-independent code. | |
6668 | break; | |
6669 | case elfcpp::Tag_ABI_HardFP_use: | |
6670 | // 1 (SP) and 2 (DP) conflict, so combine to 3 (SP & DP). | |
6671 | if ((in_attr[i].int_value() == 1 && out_attr[i].int_value() == 2) | |
6672 | || (in_attr[i].int_value() == 2 && out_attr[i].int_value() == 1)) | |
6673 | out_attr[i].set_int_value(3); | |
6674 | else if (in_attr[i].int_value() > out_attr[i].int_value()) | |
6675 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6676 | break; | |
6677 | case elfcpp::Tag_ABI_FP_16bit_format: | |
6678 | if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) | |
6679 | { | |
6680 | if (in_attr[i].int_value() != out_attr[i].int_value()) | |
6681 | gold_error(_("fp16 format mismatch between %s and output"), | |
6682 | name); | |
6683 | } | |
6684 | if (in_attr[i].int_value() != 0) | |
6685 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6686 | break; | |
6687 | ||
6688 | case elfcpp::Tag_nodefaults: | |
6689 | // This tag is set if it exists, but the value is unused (and is | |
6690 | // typically zero). We don't actually need to do anything here - | |
6691 | // the merge happens automatically when the type flags are merged | |
6692 | // below. | |
6693 | break; | |
6694 | case elfcpp::Tag_also_compatible_with: | |
6695 | // Already done in Tag_CPU_arch. | |
6696 | break; | |
6697 | case elfcpp::Tag_conformance: | |
6698 | // Keep the attribute if it matches. Throw it away otherwise. | |
6699 | // No attribute means no claim to conform. | |
6700 | if (in_attr[i].string_value() != out_attr[i].string_value()) | |
6701 | out_attr[i].set_string_value(""); | |
6702 | break; | |
6703 | ||
6704 | default: | |
6705 | { | |
6706 | const char* err_object = NULL; | |
6707 | ||
6708 | // The "known_obj_attributes" table does contain some undefined | |
6709 | // attributes. Ensure that there are unused. | |
6710 | if (out_attr[i].int_value() != 0 | |
6711 | || out_attr[i].string_value() != "") | |
6712 | err_object = "output"; | |
6713 | else if (in_attr[i].int_value() != 0 | |
6714 | || in_attr[i].string_value() != "") | |
6715 | err_object = name; | |
6716 | ||
6717 | if (err_object != NULL) | |
6718 | { | |
6719 | // Attribute numbers >=64 (mod 128) can be safely ignored. | |
6720 | if ((i & 127) < 64) | |
6721 | gold_error(_("%s: unknown mandatory EABI object attribute " | |
6722 | "%d"), | |
6723 | err_object, i); | |
6724 | else | |
6725 | gold_warning(_("%s: unknown EABI object attribute %d"), | |
6726 | err_object, i); | |
6727 | } | |
6728 | ||
6729 | // Only pass on attributes that match in both inputs. | |
6730 | if (!in_attr[i].matches(out_attr[i])) | |
6731 | { | |
6732 | out_attr[i].set_int_value(0); | |
6733 | out_attr[i].set_string_value(""); | |
6734 | } | |
6735 | } | |
6736 | } | |
6737 | ||
6738 | // If out_attr was copied from in_attr then it won't have a type yet. | |
6739 | if (in_attr[i].type() && !out_attr[i].type()) | |
6740 | out_attr[i].set_type(in_attr[i].type()); | |
6741 | } | |
6742 | ||
6743 | // Merge Tag_compatibility attributes and any common GNU ones. | |
6744 | this->attributes_section_data_->merge(name, pasd); | |
6745 | ||
6746 | // Check for any attributes not known on ARM. | |
6747 | typedef Vendor_object_attributes::Other_attributes Other_attributes; | |
6748 | const Other_attributes* in_other_attributes = pasd->other_attributes(vendor); | |
6749 | Other_attributes::const_iterator in_iter = in_other_attributes->begin(); | |
6750 | Other_attributes* out_other_attributes = | |
6751 | this->attributes_section_data_->other_attributes(vendor); | |
6752 | Other_attributes::iterator out_iter = out_other_attributes->begin(); | |
6753 | ||
6754 | while (in_iter != in_other_attributes->end() | |
6755 | || out_iter != out_other_attributes->end()) | |
6756 | { | |
6757 | const char* err_object = NULL; | |
6758 | int err_tag = 0; | |
6759 | ||
6760 | // The tags for each list are in numerical order. | |
6761 | // If the tags are equal, then merge. | |
6762 | if (out_iter != out_other_attributes->end() | |
6763 | && (in_iter == in_other_attributes->end() | |
6764 | || in_iter->first > out_iter->first)) | |
6765 | { | |
6766 | // This attribute only exists in output. We can't merge, and we | |
6767 | // don't know what the tag means, so delete it. | |
6768 | err_object = "output"; | |
6769 | err_tag = out_iter->first; | |
6770 | int saved_tag = out_iter->first; | |
6771 | delete out_iter->second; | |
6772 | out_other_attributes->erase(out_iter); | |
6773 | out_iter = out_other_attributes->upper_bound(saved_tag); | |
6774 | } | |
6775 | else if (in_iter != in_other_attributes->end() | |
6776 | && (out_iter != out_other_attributes->end() | |
6777 | || in_iter->first < out_iter->first)) | |
6778 | { | |
6779 | // This attribute only exists in input. We can't merge, and we | |
6780 | // don't know what the tag means, so ignore it. | |
6781 | err_object = name; | |
6782 | err_tag = in_iter->first; | |
6783 | ++in_iter; | |
6784 | } | |
6785 | else // The tags are equal. | |
6786 | { | |
6787 | // As present, all attributes in the list are unknown, and | |
6788 | // therefore can't be merged meaningfully. | |
6789 | err_object = "output"; | |
6790 | err_tag = out_iter->first; | |
6791 | ||
6792 | // Only pass on attributes that match in both inputs. | |
6793 | if (!in_iter->second->matches(*(out_iter->second))) | |
6794 | { | |
6795 | // No match. Delete the attribute. | |
6796 | int saved_tag = out_iter->first; | |
6797 | delete out_iter->second; | |
6798 | out_other_attributes->erase(out_iter); | |
6799 | out_iter = out_other_attributes->upper_bound(saved_tag); | |
6800 | } | |
6801 | else | |
6802 | { | |
6803 | // Matched. Keep the attribute and move to the next. | |
6804 | ++out_iter; | |
6805 | ++in_iter; | |
6806 | } | |
6807 | } | |
6808 | ||
6809 | if (err_object) | |
6810 | { | |
6811 | // Attribute numbers >=64 (mod 128) can be safely ignored. */ | |
6812 | if ((err_tag & 127) < 64) | |
6813 | { | |
6814 | gold_error(_("%s: unknown mandatory EABI object attribute %d"), | |
6815 | err_object, err_tag); | |
6816 | } | |
6817 | else | |
6818 | { | |
6819 | gold_warning(_("%s: unknown EABI object attribute %d"), | |
6820 | err_object, err_tag); | |
6821 | } | |
6822 | } | |
6823 | } | |
6824 | } | |
6825 | ||
55da9579 DK |
6826 | // Return whether a relocation type used the LSB to distinguish THUMB |
6827 | // addresses. | |
6828 | template<bool big_endian> | |
6829 | bool | |
6830 | Target_arm<big_endian>::reloc_uses_thumb_bit(unsigned int r_type) | |
6831 | { | |
6832 | switch (r_type) | |
6833 | { | |
6834 | case elfcpp::R_ARM_PC24: | |
6835 | case elfcpp::R_ARM_ABS32: | |
6836 | case elfcpp::R_ARM_REL32: | |
6837 | case elfcpp::R_ARM_SBREL32: | |
6838 | case elfcpp::R_ARM_THM_CALL: | |
6839 | case elfcpp::R_ARM_GLOB_DAT: | |
6840 | case elfcpp::R_ARM_JUMP_SLOT: | |
6841 | case elfcpp::R_ARM_GOTOFF32: | |
6842 | case elfcpp::R_ARM_PLT32: | |
6843 | case elfcpp::R_ARM_CALL: | |
6844 | case elfcpp::R_ARM_JUMP24: | |
6845 | case elfcpp::R_ARM_THM_JUMP24: | |
6846 | case elfcpp::R_ARM_SBREL31: | |
6847 | case elfcpp::R_ARM_PREL31: | |
6848 | case elfcpp::R_ARM_MOVW_ABS_NC: | |
6849 | case elfcpp::R_ARM_MOVW_PREL_NC: | |
6850 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
6851 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
6852 | case elfcpp::R_ARM_THM_JUMP19: | |
6853 | case elfcpp::R_ARM_THM_ALU_PREL_11_0: | |
6854 | case elfcpp::R_ARM_ALU_PC_G0_NC: | |
6855 | case elfcpp::R_ARM_ALU_PC_G0: | |
6856 | case elfcpp::R_ARM_ALU_PC_G1_NC: | |
6857 | case elfcpp::R_ARM_ALU_PC_G1: | |
6858 | case elfcpp::R_ARM_ALU_PC_G2: | |
6859 | case elfcpp::R_ARM_ALU_SB_G0_NC: | |
6860 | case elfcpp::R_ARM_ALU_SB_G0: | |
6861 | case elfcpp::R_ARM_ALU_SB_G1_NC: | |
6862 | case elfcpp::R_ARM_ALU_SB_G1: | |
6863 | case elfcpp::R_ARM_ALU_SB_G2: | |
6864 | case elfcpp::R_ARM_MOVW_BREL_NC: | |
6865 | case elfcpp::R_ARM_MOVW_BREL: | |
6866 | case elfcpp::R_ARM_THM_MOVW_BREL_NC: | |
6867 | case elfcpp::R_ARM_THM_MOVW_BREL: | |
6868 | return true; | |
6869 | default: | |
6870 | return false; | |
6871 | } | |
6872 | } | |
6873 | ||
6874 | // Stub-generation methods for Target_arm. | |
6875 | ||
6876 | // Make a new Arm_input_section object. | |
6877 | ||
6878 | template<bool big_endian> | |
6879 | Arm_input_section<big_endian>* | |
6880 | Target_arm<big_endian>::new_arm_input_section( | |
2ea97941 ILT |
6881 | Relobj* relobj, |
6882 | unsigned int shndx) | |
55da9579 | 6883 | { |
2ea97941 | 6884 | Input_section_specifier iss(relobj, shndx); |
55da9579 DK |
6885 | |
6886 | Arm_input_section<big_endian>* arm_input_section = | |
2ea97941 | 6887 | new Arm_input_section<big_endian>(relobj, shndx); |
55da9579 DK |
6888 | arm_input_section->init(); |
6889 | ||
6890 | // Register new Arm_input_section in map for look-up. | |
6891 | std::pair<typename Arm_input_section_map::iterator, bool> ins = | |
6892 | this->arm_input_section_map_.insert(std::make_pair(iss, arm_input_section)); | |
6893 | ||
6894 | // Make sure that it we have not created another Arm_input_section | |
6895 | // for this input section already. | |
6896 | gold_assert(ins.second); | |
6897 | ||
6898 | return arm_input_section; | |
6899 | } | |
6900 | ||
6901 | // Find the Arm_input_section object corresponding to the SHNDX-th input | |
6902 | // section of RELOBJ. | |
6903 | ||
6904 | template<bool big_endian> | |
6905 | Arm_input_section<big_endian>* | |
6906 | Target_arm<big_endian>::find_arm_input_section( | |
2ea97941 ILT |
6907 | Relobj* relobj, |
6908 | unsigned int shndx) const | |
55da9579 | 6909 | { |
2ea97941 | 6910 | Input_section_specifier iss(relobj, shndx); |
55da9579 DK |
6911 | typename Arm_input_section_map::const_iterator p = |
6912 | this->arm_input_section_map_.find(iss); | |
6913 | return (p != this->arm_input_section_map_.end()) ? p->second : NULL; | |
6914 | } | |
6915 | ||
6916 | // Make a new stub table. | |
6917 | ||
6918 | template<bool big_endian> | |
6919 | Stub_table<big_endian>* | |
6920 | Target_arm<big_endian>::new_stub_table(Arm_input_section<big_endian>* owner) | |
6921 | { | |
2ea97941 | 6922 | Stub_table<big_endian>* stub_table = |
55da9579 | 6923 | new Stub_table<big_endian>(owner); |
2ea97941 | 6924 | this->stub_tables_.push_back(stub_table); |
55da9579 | 6925 | |
2ea97941 ILT |
6926 | stub_table->set_address(owner->address() + owner->data_size()); |
6927 | stub_table->set_file_offset(owner->offset() + owner->data_size()); | |
6928 | stub_table->finalize_data_size(); | |
55da9579 | 6929 | |
2ea97941 | 6930 | return stub_table; |
55da9579 DK |
6931 | } |
6932 | ||
eb44217c DK |
6933 | // Scan a relocation for stub generation. |
6934 | ||
6935 | template<bool big_endian> | |
6936 | void | |
6937 | Target_arm<big_endian>::scan_reloc_for_stub( | |
6938 | const Relocate_info<32, big_endian>* relinfo, | |
6939 | unsigned int r_type, | |
6940 | const Sized_symbol<32>* gsym, | |
6941 | unsigned int r_sym, | |
6942 | const Symbol_value<32>* psymval, | |
6943 | elfcpp::Elf_types<32>::Elf_Swxword addend, | |
6944 | Arm_address address) | |
6945 | { | |
2ea97941 | 6946 | typedef typename Target_arm<big_endian>::Relocate Relocate; |
eb44217c DK |
6947 | |
6948 | const Arm_relobj<big_endian>* arm_relobj = | |
6949 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
6950 | ||
6951 | bool target_is_thumb; | |
6952 | Symbol_value<32> symval; | |
6953 | if (gsym != NULL) | |
6954 | { | |
6955 | // This is a global symbol. Determine if we use PLT and if the | |
6956 | // final target is THUMB. | |
2ea97941 | 6957 | if (gsym->use_plt_offset(Relocate::reloc_is_non_pic(r_type))) |
eb44217c DK |
6958 | { |
6959 | // This uses a PLT, change the symbol value. | |
6960 | symval.set_output_value(this->plt_section()->address() | |
6961 | + gsym->plt_offset()); | |
6962 | psymval = &symval; | |
6963 | target_is_thumb = false; | |
6964 | } | |
6965 | else if (gsym->is_undefined()) | |
6966 | // There is no need to generate a stub symbol is undefined. | |
6967 | return; | |
6968 | else | |
6969 | { | |
6970 | target_is_thumb = | |
6971 | ((gsym->type() == elfcpp::STT_ARM_TFUNC) | |
6972 | || (gsym->type() == elfcpp::STT_FUNC | |
6973 | && !gsym->is_undefined() | |
6974 | && ((psymval->value(arm_relobj, 0) & 1) != 0))); | |
6975 | } | |
6976 | } | |
6977 | else | |
6978 | { | |
6979 | // This is a local symbol. Determine if the final target is THUMB. | |
6980 | target_is_thumb = arm_relobj->local_symbol_is_thumb_function(r_sym); | |
6981 | } | |
6982 | ||
6983 | // Strip LSB if this points to a THUMB target. | |
6984 | if (target_is_thumb | |
6985 | && Target_arm<big_endian>::reloc_uses_thumb_bit(r_type) | |
6986 | && ((psymval->value(arm_relobj, 0) & 1) != 0)) | |
6987 | { | |
6988 | Arm_address stripped_value = | |
6989 | psymval->value(arm_relobj, 0) & ~static_cast<Arm_address>(1); | |
6990 | symval.set_output_value(stripped_value); | |
6991 | psymval = &symval; | |
6992 | } | |
6993 | ||
6994 | // Get the symbol value. | |
6995 | Symbol_value<32>::Value value = psymval->value(arm_relobj, 0); | |
6996 | ||
6997 | // Owing to pipelining, the PC relative branches below actually skip | |
6998 | // two instructions when the branch offset is 0. | |
6999 | Arm_address destination; | |
7000 | switch (r_type) | |
7001 | { | |
7002 | case elfcpp::R_ARM_CALL: | |
7003 | case elfcpp::R_ARM_JUMP24: | |
7004 | case elfcpp::R_ARM_PLT32: | |
7005 | // ARM branches. | |
7006 | destination = value + addend + 8; | |
7007 | break; | |
7008 | case elfcpp::R_ARM_THM_CALL: | |
7009 | case elfcpp::R_ARM_THM_XPC22: | |
7010 | case elfcpp::R_ARM_THM_JUMP24: | |
7011 | case elfcpp::R_ARM_THM_JUMP19: | |
7012 | // THUMB branches. | |
7013 | destination = value + addend + 4; | |
7014 | break; | |
7015 | default: | |
7016 | gold_unreachable(); | |
7017 | } | |
7018 | ||
7019 | Stub_type stub_type = | |
7020 | Reloc_stub::stub_type_for_reloc(r_type, address, destination, | |
7021 | target_is_thumb); | |
7022 | ||
7023 | // This reloc does not need a stub. | |
7024 | if (stub_type == arm_stub_none) | |
7025 | return; | |
7026 | ||
7027 | // Try looking up an existing stub from a stub table. | |
2ea97941 | 7028 | Stub_table<big_endian>* stub_table = |
eb44217c | 7029 | arm_relobj->stub_table(relinfo->data_shndx); |
2ea97941 | 7030 | gold_assert(stub_table != NULL); |
eb44217c DK |
7031 | |
7032 | // Locate stub by destination. | |
7033 | Reloc_stub::Key stub_key(stub_type, gsym, arm_relobj, r_sym, addend); | |
7034 | ||
7035 | // Create a stub if there is not one already | |
2ea97941 | 7036 | Reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
eb44217c DK |
7037 | if (stub == NULL) |
7038 | { | |
7039 | // create a new stub and add it to stub table. | |
7040 | stub = this->stub_factory().make_reloc_stub(stub_type); | |
2ea97941 | 7041 | stub_table->add_reloc_stub(stub, stub_key); |
eb44217c DK |
7042 | } |
7043 | ||
7044 | // Record the destination address. | |
7045 | stub->set_destination_address(destination | |
7046 | | (target_is_thumb ? 1 : 0)); | |
7047 | } | |
7048 | ||
7049 | // This function scans a relocation sections for stub generation. | |
7050 | // The template parameter Relocate must be a class type which provides | |
7051 | // a single function, relocate(), which implements the machine | |
7052 | // specific part of a relocation. | |
7053 | ||
7054 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: | |
7055 | // SHT_REL or SHT_RELA. | |
7056 | ||
7057 | // PRELOCS points to the relocation data. RELOC_COUNT is the number | |
7058 | // of relocs. OUTPUT_SECTION is the output section. | |
7059 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be | |
7060 | // mapped to output offsets. | |
7061 | ||
7062 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and | |
7063 | // VIEW_SIZE is the size. These refer to the input section, unless | |
7064 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to | |
7065 | // the output section. | |
7066 | ||
7067 | template<bool big_endian> | |
7068 | template<int sh_type> | |
7069 | void inline | |
7070 | Target_arm<big_endian>::scan_reloc_section_for_stubs( | |
7071 | const Relocate_info<32, big_endian>* relinfo, | |
7072 | const unsigned char* prelocs, | |
7073 | size_t reloc_count, | |
7074 | Output_section* output_section, | |
7075 | bool needs_special_offset_handling, | |
7076 | const unsigned char* view, | |
7077 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
7078 | section_size_type) | |
7079 | { | |
7080 | typedef typename Reloc_types<sh_type, 32, big_endian>::Reloc Reltype; | |
7081 | const int reloc_size = | |
7082 | Reloc_types<sh_type, 32, big_endian>::reloc_size; | |
7083 | ||
7084 | Arm_relobj<big_endian>* arm_object = | |
7085 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
7086 | unsigned int local_count = arm_object->local_symbol_count(); | |
7087 | ||
7088 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; | |
7089 | ||
7090 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
7091 | { | |
7092 | Reltype reloc(prelocs); | |
7093 | ||
7094 | typename elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info(); | |
7095 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
7096 | unsigned int r_type = elfcpp::elf_r_type<32>(r_info); | |
7097 | ||
7098 | r_type = this->get_real_reloc_type(r_type); | |
7099 | ||
7100 | // Only a few relocation types need stubs. | |
7101 | if ((r_type != elfcpp::R_ARM_CALL) | |
7102 | && (r_type != elfcpp::R_ARM_JUMP24) | |
7103 | && (r_type != elfcpp::R_ARM_PLT32) | |
7104 | && (r_type != elfcpp::R_ARM_THM_CALL) | |
7105 | && (r_type != elfcpp::R_ARM_THM_XPC22) | |
7106 | && (r_type != elfcpp::R_ARM_THM_JUMP24) | |
7107 | && (r_type != elfcpp::R_ARM_THM_JUMP19)) | |
7108 | continue; | |
7109 | ||
2ea97941 | 7110 | section_offset_type offset = |
eb44217c DK |
7111 | convert_to_section_size_type(reloc.get_r_offset()); |
7112 | ||
7113 | if (needs_special_offset_handling) | |
7114 | { | |
2ea97941 ILT |
7115 | offset = output_section->output_offset(relinfo->object, |
7116 | relinfo->data_shndx, | |
7117 | offset); | |
7118 | if (offset == -1) | |
eb44217c DK |
7119 | continue; |
7120 | } | |
7121 | ||
7122 | // Get the addend. | |
7123 | Stub_addend_reader<sh_type, big_endian> stub_addend_reader; | |
7124 | elfcpp::Elf_types<32>::Elf_Swxword addend = | |
2ea97941 | 7125 | stub_addend_reader(r_type, view + offset, reloc); |
eb44217c DK |
7126 | |
7127 | const Sized_symbol<32>* sym; | |
7128 | ||
7129 | Symbol_value<32> symval; | |
7130 | const Symbol_value<32> *psymval; | |
7131 | if (r_sym < local_count) | |
7132 | { | |
7133 | sym = NULL; | |
7134 | psymval = arm_object->local_symbol(r_sym); | |
7135 | ||
7136 | // If the local symbol belongs to a section we are discarding, | |
7137 | // and that section is a debug section, try to find the | |
7138 | // corresponding kept section and map this symbol to its | |
7139 | // counterpart in the kept section. The symbol must not | |
7140 | // correspond to a section we are folding. | |
7141 | bool is_ordinary; | |
2ea97941 | 7142 | unsigned int shndx = psymval->input_shndx(&is_ordinary); |
eb44217c | 7143 | if (is_ordinary |
2ea97941 ILT |
7144 | && shndx != elfcpp::SHN_UNDEF |
7145 | && !arm_object->is_section_included(shndx) | |
7146 | && !(relinfo->symtab->is_section_folded(arm_object, shndx))) | |
eb44217c DK |
7147 | { |
7148 | if (comdat_behavior == CB_UNDETERMINED) | |
7149 | { | |
7150 | std::string name = | |
7151 | arm_object->section_name(relinfo->data_shndx); | |
7152 | comdat_behavior = get_comdat_behavior(name.c_str()); | |
7153 | } | |
7154 | if (comdat_behavior == CB_PRETEND) | |
7155 | { | |
7156 | bool found; | |
7157 | typename elfcpp::Elf_types<32>::Elf_Addr value = | |
2ea97941 | 7158 | arm_object->map_to_kept_section(shndx, &found); |
eb44217c DK |
7159 | if (found) |
7160 | symval.set_output_value(value + psymval->input_value()); | |
7161 | else | |
7162 | symval.set_output_value(0); | |
7163 | } | |
7164 | else | |
7165 | { | |
7166 | symval.set_output_value(0); | |
7167 | } | |
7168 | symval.set_no_output_symtab_entry(); | |
7169 | psymval = &symval; | |
7170 | } | |
7171 | } | |
7172 | else | |
7173 | { | |
7174 | const Symbol* gsym = arm_object->global_symbol(r_sym); | |
7175 | gold_assert(gsym != NULL); | |
7176 | if (gsym->is_forwarder()) | |
7177 | gsym = relinfo->symtab->resolve_forwards(gsym); | |
7178 | ||
7179 | sym = static_cast<const Sized_symbol<32>*>(gsym); | |
7180 | if (sym->has_symtab_index()) | |
7181 | symval.set_output_symtab_index(sym->symtab_index()); | |
7182 | else | |
7183 | symval.set_no_output_symtab_entry(); | |
7184 | ||
7185 | // We need to compute the would-be final value of this global | |
7186 | // symbol. | |
7187 | const Symbol_table* symtab = relinfo->symtab; | |
7188 | const Sized_symbol<32>* sized_symbol = | |
7189 | symtab->get_sized_symbol<32>(gsym); | |
7190 | Symbol_table::Compute_final_value_status status; | |
7191 | Arm_address value = | |
7192 | symtab->compute_final_value<32>(sized_symbol, &status); | |
7193 | ||
7194 | // Skip this if the symbol has not output section. | |
7195 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) | |
7196 | continue; | |
7197 | ||
7198 | symval.set_output_value(value); | |
7199 | psymval = &symval; | |
7200 | } | |
7201 | ||
7202 | // If symbol is a section symbol, we don't know the actual type of | |
7203 | // destination. Give up. | |
7204 | if (psymval->is_section_symbol()) | |
7205 | continue; | |
7206 | ||
7207 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, | |
2ea97941 | 7208 | addend, view_address + offset); |
eb44217c DK |
7209 | } |
7210 | } | |
7211 | ||
7212 | // Scan an input section for stub generation. | |
7213 | ||
7214 | template<bool big_endian> | |
7215 | void | |
7216 | Target_arm<big_endian>::scan_section_for_stubs( | |
7217 | const Relocate_info<32, big_endian>* relinfo, | |
7218 | unsigned int sh_type, | |
7219 | const unsigned char* prelocs, | |
7220 | size_t reloc_count, | |
7221 | Output_section* output_section, | |
7222 | bool needs_special_offset_handling, | |
7223 | const unsigned char* view, | |
7224 | Arm_address view_address, | |
7225 | section_size_type view_size) | |
7226 | { | |
7227 | if (sh_type == elfcpp::SHT_REL) | |
7228 | this->scan_reloc_section_for_stubs<elfcpp::SHT_REL>( | |
7229 | relinfo, | |
7230 | prelocs, | |
7231 | reloc_count, | |
7232 | output_section, | |
7233 | needs_special_offset_handling, | |
7234 | view, | |
7235 | view_address, | |
7236 | view_size); | |
7237 | else if (sh_type == elfcpp::SHT_RELA) | |
7238 | // We do not support RELA type relocations yet. This is provided for | |
7239 | // completeness. | |
7240 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( | |
7241 | relinfo, | |
7242 | prelocs, | |
7243 | reloc_count, | |
7244 | output_section, | |
7245 | needs_special_offset_handling, | |
7246 | view, | |
7247 | view_address, | |
7248 | view_size); | |
7249 | else | |
7250 | gold_unreachable(); | |
7251 | } | |
7252 | ||
7253 | // Group input sections for stub generation. | |
7254 | // | |
7255 | // We goup input sections in an output sections so that the total size, | |
7256 | // including any padding space due to alignment is smaller than GROUP_SIZE | |
7257 | // unless the only input section in group is bigger than GROUP_SIZE already. | |
7258 | // Then an ARM stub table is created to follow the last input section | |
7259 | // in group. For each group an ARM stub table is created an is placed | |
7260 | // after the last group. If STUB_ALWATS_AFTER_BRANCH is false, we further | |
7261 | // extend the group after the stub table. | |
7262 | ||
7263 | template<bool big_endian> | |
7264 | void | |
7265 | Target_arm<big_endian>::group_sections( | |
2ea97941 | 7266 | Layout* layout, |
eb44217c DK |
7267 | section_size_type group_size, |
7268 | bool stubs_always_after_branch) | |
7269 | { | |
7270 | // Group input sections and insert stub table | |
7271 | Layout::Section_list section_list; | |
2ea97941 | 7272 | layout->get_allocated_sections(§ion_list); |
eb44217c DK |
7273 | for (Layout::Section_list::const_iterator p = section_list.begin(); |
7274 | p != section_list.end(); | |
7275 | ++p) | |
7276 | { | |
7277 | Arm_output_section<big_endian>* output_section = | |
7278 | Arm_output_section<big_endian>::as_arm_output_section(*p); | |
7279 | output_section->group_sections(group_size, stubs_always_after_branch, | |
7280 | this); | |
7281 | } | |
7282 | } | |
7283 | ||
7284 | // Relaxation hook. This is where we do stub generation. | |
7285 | ||
7286 | template<bool big_endian> | |
7287 | bool | |
7288 | Target_arm<big_endian>::do_relax( | |
7289 | int pass, | |
7290 | const Input_objects* input_objects, | |
7291 | Symbol_table* symtab, | |
2ea97941 | 7292 | Layout* layout) |
eb44217c DK |
7293 | { |
7294 | // No need to generate stubs if this is a relocatable link. | |
7295 | gold_assert(!parameters->options().relocatable()); | |
7296 | ||
7297 | // If this is the first pass, we need to group input sections into | |
7298 | // stub groups. | |
7299 | if (pass == 1) | |
7300 | { | |
7301 | // Determine the stub group size. The group size is the absolute | |
7302 | // value of the parameter --stub-group-size. If --stub-group-size | |
7303 | // is passed a negative value, we restict stubs to be always after | |
7304 | // the stubbed branches. | |
7305 | int32_t stub_group_size_param = | |
7306 | parameters->options().stub_group_size(); | |
7307 | bool stubs_always_after_branch = stub_group_size_param < 0; | |
7308 | section_size_type stub_group_size = abs(stub_group_size_param); | |
7309 | ||
7310 | if (stub_group_size == 1) | |
7311 | { | |
7312 | // Default value. | |
7313 | // Thumb branch range is +-4MB has to be used as the default | |
7314 | // maximum size (a given section can contain both ARM and Thumb | |
7315 | // code, so the worst case has to be taken into account). | |
7316 | // | |
7317 | // This value is 24K less than that, which allows for 2025 | |
7318 | // 12-byte stubs. If we exceed that, then we will fail to link. | |
7319 | // The user will have to relink with an explicit group size | |
7320 | // option. | |
7321 | stub_group_size = 4170000; | |
7322 | } | |
7323 | ||
2ea97941 | 7324 | group_sections(layout, stub_group_size, stubs_always_after_branch); |
eb44217c DK |
7325 | } |
7326 | ||
eb44217c | 7327 | typedef typename Stub_table_list::iterator Stub_table_iterator; |
eb44217c DK |
7328 | |
7329 | // scan relocs for stubs | |
7330 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); | |
7331 | op != input_objects->relobj_end(); | |
7332 | ++op) | |
7333 | { | |
7334 | Arm_relobj<big_endian>* arm_relobj = | |
7335 | Arm_relobj<big_endian>::as_arm_relobj(*op); | |
2ea97941 | 7336 | arm_relobj->scan_sections_for_stubs(this, symtab, layout); |
eb44217c DK |
7337 | } |
7338 | ||
2fb7225c DK |
7339 | // Check all stub tables to see if any of them have their data sizes |
7340 | // or addresses alignments changed. These are the only things that | |
7341 | // matter. | |
eb44217c DK |
7342 | bool any_stub_table_changed = false; |
7343 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
7344 | (sp != this->stub_tables_.end()) && !any_stub_table_changed; | |
7345 | ++sp) | |
7346 | { | |
2fb7225c | 7347 | if ((*sp)->update_data_size_and_addralign()) |
eb44217c DK |
7348 | any_stub_table_changed = true; |
7349 | } | |
7350 | ||
2fb7225c DK |
7351 | // Finalize the stubs in the last relaxation pass. |
7352 | if (!any_stub_table_changed) | |
7353 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
7354 | (sp != this->stub_tables_.end()) && !any_stub_table_changed; | |
7355 | ++sp) | |
7356 | (*sp)->finalize_stubs(); | |
7357 | ||
eb44217c DK |
7358 | return any_stub_table_changed; |
7359 | } | |
7360 | ||
43d12afe DK |
7361 | // Relocate a stub. |
7362 | ||
7363 | template<bool big_endian> | |
7364 | void | |
7365 | Target_arm<big_endian>::relocate_stub( | |
2fb7225c | 7366 | Stub* stub, |
43d12afe DK |
7367 | const Relocate_info<32, big_endian>* relinfo, |
7368 | Output_section* output_section, | |
7369 | unsigned char* view, | |
7370 | Arm_address address, | |
7371 | section_size_type view_size) | |
7372 | { | |
7373 | Relocate relocate; | |
2ea97941 ILT |
7374 | const Stub_template* stub_template = stub->stub_template(); |
7375 | for (size_t i = 0; i < stub_template->reloc_count(); i++) | |
43d12afe | 7376 | { |
2ea97941 ILT |
7377 | size_t reloc_insn_index = stub_template->reloc_insn_index(i); |
7378 | const Insn_template* insn = &stub_template->insns()[reloc_insn_index]; | |
43d12afe DK |
7379 | |
7380 | unsigned int r_type = insn->r_type(); | |
2ea97941 | 7381 | section_size_type reloc_offset = stub_template->reloc_offset(i); |
43d12afe DK |
7382 | section_size_type reloc_size = insn->size(); |
7383 | gold_assert(reloc_offset + reloc_size <= view_size); | |
7384 | ||
7385 | // This is the address of the stub destination. | |
7386 | Arm_address target = stub->reloc_target(i); | |
7387 | Symbol_value<32> symval; | |
7388 | symval.set_output_value(target); | |
7389 | ||
7390 | // Synthesize a fake reloc just in case. We don't have a symbol so | |
7391 | // we use 0. | |
7392 | unsigned char reloc_buffer[elfcpp::Elf_sizes<32>::rel_size]; | |
7393 | memset(reloc_buffer, 0, sizeof(reloc_buffer)); | |
7394 | elfcpp::Rel_write<32, big_endian> reloc_write(reloc_buffer); | |
7395 | reloc_write.put_r_offset(reloc_offset); | |
7396 | reloc_write.put_r_info(elfcpp::elf_r_info<32>(0, r_type)); | |
7397 | elfcpp::Rel<32, big_endian> rel(reloc_buffer); | |
7398 | ||
7399 | relocate.relocate(relinfo, this, output_section, | |
7400 | this->fake_relnum_for_stubs, rel, r_type, | |
7401 | NULL, &symval, view + reloc_offset, | |
7402 | address + reloc_offset, reloc_size); | |
7403 | } | |
7404 | } | |
7405 | ||
a0351a69 DK |
7406 | // Determine whether an object attribute tag takes an integer, a |
7407 | // string or both. | |
7408 | ||
7409 | template<bool big_endian> | |
7410 | int | |
7411 | Target_arm<big_endian>::do_attribute_arg_type(int tag) const | |
7412 | { | |
7413 | if (tag == Object_attribute::Tag_compatibility) | |
7414 | return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL | |
7415 | | Object_attribute::ATTR_TYPE_FLAG_STR_VAL); | |
7416 | else if (tag == elfcpp::Tag_nodefaults) | |
7417 | return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL | |
7418 | | Object_attribute::ATTR_TYPE_FLAG_NO_DEFAULT); | |
7419 | else if (tag == elfcpp::Tag_CPU_raw_name || tag == elfcpp::Tag_CPU_name) | |
7420 | return Object_attribute::ATTR_TYPE_FLAG_STR_VAL; | |
7421 | else if (tag < 32) | |
7422 | return Object_attribute::ATTR_TYPE_FLAG_INT_VAL; | |
7423 | else | |
7424 | return ((tag & 1) != 0 | |
7425 | ? Object_attribute::ATTR_TYPE_FLAG_STR_VAL | |
7426 | : Object_attribute::ATTR_TYPE_FLAG_INT_VAL); | |
7427 | } | |
7428 | ||
7429 | // Reorder attributes. | |
7430 | // | |
7431 | // The ABI defines that Tag_conformance should be emitted first, and that | |
7432 | // Tag_nodefaults should be second (if either is defined). This sets those | |
7433 | // two positions, and bumps up the position of all the remaining tags to | |
7434 | // compensate. | |
7435 | ||
7436 | template<bool big_endian> | |
7437 | int | |
7438 | Target_arm<big_endian>::do_attributes_order(int num) const | |
7439 | { | |
7440 | // Reorder the known object attributes in output. We want to move | |
7441 | // Tag_conformance to position 4 and Tag_conformance to position 5 | |
7442 | // and shift eveything between 4 .. Tag_conformance - 1 to make room. | |
7443 | if (num == 4) | |
7444 | return elfcpp::Tag_conformance; | |
7445 | if (num == 5) | |
7446 | return elfcpp::Tag_nodefaults; | |
7447 | if ((num - 2) < elfcpp::Tag_nodefaults) | |
7448 | return num - 2; | |
7449 | if ((num - 1) < elfcpp::Tag_conformance) | |
7450 | return num - 1; | |
7451 | return num; | |
7452 | } | |
4a657b0d DK |
7453 | |
7454 | template<bool big_endian> | |
7455 | class Target_selector_arm : public Target_selector | |
7456 | { | |
7457 | public: | |
7458 | Target_selector_arm() | |
7459 | : Target_selector(elfcpp::EM_ARM, 32, big_endian, | |
7460 | (big_endian ? "elf32-bigarm" : "elf32-littlearm")) | |
7461 | { } | |
7462 | ||
7463 | Target* | |
7464 | do_instantiate_target() | |
7465 | { return new Target_arm<big_endian>(); } | |
7466 | }; | |
7467 | ||
7468 | Target_selector_arm<false> target_selector_arm; | |
7469 | Target_selector_arm<true> target_selector_armbe; | |
7470 | ||
7471 | } // End anonymous namespace. |