Commit | Line | Data |
---|---|---|
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> |
41263c05 DK |
33 | #include <map> |
34 | #include <utility> | |
4a657b0d DK |
35 | |
36 | #include "elfcpp.h" | |
37 | #include "parameters.h" | |
38 | #include "reloc.h" | |
39 | #include "arm.h" | |
40 | #include "object.h" | |
41 | #include "symtab.h" | |
42 | #include "layout.h" | |
43 | #include "output.h" | |
44 | #include "copy-relocs.h" | |
45 | #include "target.h" | |
46 | #include "target-reloc.h" | |
47 | #include "target-select.h" | |
48 | #include "tls.h" | |
49 | #include "defstd.h" | |
f345227a | 50 | #include "gc.h" |
a0351a69 | 51 | #include "attributes.h" |
4a657b0d DK |
52 | |
53 | namespace | |
54 | { | |
55 | ||
56 | using namespace gold; | |
57 | ||
94cdfcff DK |
58 | template<bool big_endian> |
59 | class Output_data_plt_arm; | |
60 | ||
56ee5e00 DK |
61 | template<bool big_endian> |
62 | class Stub_table; | |
63 | ||
64 | template<bool big_endian> | |
65 | class Arm_input_section; | |
66 | ||
07f508a2 DK |
67 | template<bool big_endian> |
68 | class Arm_output_section; | |
69 | ||
70 | template<bool big_endian> | |
71 | class Arm_relobj; | |
72 | ||
b569affa DK |
73 | template<bool big_endian> |
74 | class Target_arm; | |
75 | ||
76 | // For convenience. | |
77 | typedef elfcpp::Elf_types<32>::Elf_Addr Arm_address; | |
78 | ||
79 | // Maximum branch offsets for ARM, THUMB and THUMB2. | |
80 | const int32_t ARM_MAX_FWD_BRANCH_OFFSET = ((((1 << 23) - 1) << 2) + 8); | |
81 | const int32_t ARM_MAX_BWD_BRANCH_OFFSET = ((-((1 << 23) << 2)) + 8); | |
82 | const int32_t THM_MAX_FWD_BRANCH_OFFSET = ((1 << 22) -2 + 4); | |
83 | const int32_t THM_MAX_BWD_BRANCH_OFFSET = (-(1 << 22) + 4); | |
84 | const int32_t THM2_MAX_FWD_BRANCH_OFFSET = (((1 << 24) - 2) + 4); | |
85 | const int32_t THM2_MAX_BWD_BRANCH_OFFSET = (-(1 << 24) + 4); | |
86 | ||
4a657b0d DK |
87 | // The arm target class. |
88 | // | |
89 | // This is a very simple port of gold for ARM-EABI. It is intended for | |
90 | // supporting Android only for the time being. Only these relocation types | |
91 | // are supported. | |
92 | // | |
93 | // R_ARM_NONE | |
94 | // R_ARM_ABS32 | |
be8fcb75 ILT |
95 | // R_ARM_ABS32_NOI |
96 | // R_ARM_ABS16 | |
97 | // R_ARM_ABS12 | |
98 | // R_ARM_ABS8 | |
99 | // R_ARM_THM_ABS5 | |
100 | // R_ARM_BASE_ABS | |
4a657b0d DK |
101 | // R_ARM_REL32 |
102 | // R_ARM_THM_CALL | |
103 | // R_ARM_COPY | |
104 | // R_ARM_GLOB_DAT | |
105 | // R_ARM_BASE_PREL | |
106 | // R_ARM_JUMP_SLOT | |
107 | // R_ARM_RELATIVE | |
108 | // R_ARM_GOTOFF32 | |
109 | // R_ARM_GOT_BREL | |
7f5309a5 | 110 | // R_ARM_GOT_PREL |
4a657b0d DK |
111 | // R_ARM_PLT32 |
112 | // R_ARM_CALL | |
113 | // R_ARM_JUMP24 | |
114 | // R_ARM_TARGET1 | |
115 | // R_ARM_PREL31 | |
7f5309a5 | 116 | // R_ARM_ABS8 |
fd3c5f0b ILT |
117 | // R_ARM_MOVW_ABS_NC |
118 | // R_ARM_MOVT_ABS | |
119 | // R_ARM_THM_MOVW_ABS_NC | |
c2a122b6 ILT |
120 | // R_ARM_THM_MOVT_ABS |
121 | // R_ARM_MOVW_PREL_NC | |
122 | // R_ARM_MOVT_PREL | |
123 | // R_ARM_THM_MOVW_PREL_NC | |
124 | // R_ARM_THM_MOVT_PREL | |
4a657b0d | 125 | // |
4a657b0d | 126 | // TODOs: |
4a657b0d | 127 | // - Support more relocation types as needed. |
94cdfcff DK |
128 | // - Make PLTs more flexible for different architecture features like |
129 | // Thumb-2 and BE8. | |
11af873f | 130 | // There are probably a lot more. |
4a657b0d | 131 | |
b569affa DK |
132 | // Instruction template class. This class is similar to the insn_sequence |
133 | // struct in bfd/elf32-arm.c. | |
134 | ||
135 | class Insn_template | |
136 | { | |
137 | public: | |
138 | // Types of instruction templates. | |
139 | enum Type | |
140 | { | |
141 | THUMB16_TYPE = 1, | |
bb0d3eb0 DK |
142 | // THUMB16_SPECIAL_TYPE is used by sub-classes of Stub for instruction |
143 | // templates with class-specific semantics. Currently this is used | |
144 | // only by the Cortex_a8_stub class for handling condition codes in | |
145 | // conditional branches. | |
146 | THUMB16_SPECIAL_TYPE, | |
b569affa DK |
147 | THUMB32_TYPE, |
148 | ARM_TYPE, | |
149 | DATA_TYPE | |
150 | }; | |
151 | ||
bb0d3eb0 | 152 | // Factory methods to create instruction templates in different formats. |
b569affa DK |
153 | |
154 | static const Insn_template | |
155 | thumb16_insn(uint32_t data) | |
156 | { return Insn_template(data, THUMB16_TYPE, elfcpp::R_ARM_NONE, 0); } | |
157 | ||
bb0d3eb0 DK |
158 | // A Thumb conditional branch, in which the proper condition is inserted |
159 | // when we build the stub. | |
b569affa DK |
160 | static const Insn_template |
161 | thumb16_bcond_insn(uint32_t data) | |
bb0d3eb0 | 162 | { return Insn_template(data, THUMB16_SPECIAL_TYPE, elfcpp::R_ARM_NONE, 1); } |
b569affa DK |
163 | |
164 | static const Insn_template | |
165 | thumb32_insn(uint32_t data) | |
166 | { return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_NONE, 0); } | |
167 | ||
168 | static const Insn_template | |
169 | thumb32_b_insn(uint32_t data, int reloc_addend) | |
170 | { | |
171 | return Insn_template(data, THUMB32_TYPE, elfcpp::R_ARM_THM_JUMP24, | |
172 | reloc_addend); | |
173 | } | |
174 | ||
175 | static const Insn_template | |
176 | arm_insn(uint32_t data) | |
177 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_NONE, 0); } | |
178 | ||
179 | static const Insn_template | |
180 | arm_rel_insn(unsigned data, int reloc_addend) | |
181 | { return Insn_template(data, ARM_TYPE, elfcpp::R_ARM_JUMP24, reloc_addend); } | |
182 | ||
183 | static const Insn_template | |
184 | data_word(unsigned data, unsigned int r_type, int reloc_addend) | |
185 | { return Insn_template(data, DATA_TYPE, r_type, reloc_addend); } | |
186 | ||
187 | // Accessors. This class is used for read-only objects so no modifiers | |
188 | // are provided. | |
189 | ||
190 | uint32_t | |
191 | data() const | |
192 | { return this->data_; } | |
193 | ||
194 | // Return the instruction sequence type of this. | |
195 | Type | |
196 | type() const | |
197 | { return this->type_; } | |
198 | ||
199 | // Return the ARM relocation type of this. | |
200 | unsigned int | |
201 | r_type() const | |
202 | { return this->r_type_; } | |
203 | ||
204 | int32_t | |
205 | reloc_addend() const | |
206 | { return this->reloc_addend_; } | |
207 | ||
bb0d3eb0 | 208 | // Return size of instruction template in bytes. |
b569affa DK |
209 | size_t |
210 | size() const; | |
211 | ||
bb0d3eb0 | 212 | // Return byte-alignment of instruction template. |
b569affa DK |
213 | unsigned |
214 | alignment() const; | |
215 | ||
216 | private: | |
217 | // We make the constructor private to ensure that only the factory | |
218 | // methods are used. | |
219 | inline | |
2ea97941 ILT |
220 | Insn_template(unsigned data, Type type, unsigned int r_type, int reloc_addend) |
221 | : data_(data), type_(type), r_type_(r_type), reloc_addend_(reloc_addend) | |
b569affa DK |
222 | { } |
223 | ||
224 | // Instruction specific data. This is used to store information like | |
225 | // some of the instruction bits. | |
226 | uint32_t data_; | |
227 | // Instruction template type. | |
228 | Type type_; | |
229 | // Relocation type if there is a relocation or R_ARM_NONE otherwise. | |
230 | unsigned int r_type_; | |
231 | // Relocation addend. | |
232 | int32_t reloc_addend_; | |
233 | }; | |
234 | ||
235 | // Macro for generating code to stub types. One entry per long/short | |
236 | // branch stub | |
237 | ||
238 | #define DEF_STUBS \ | |
239 | DEF_STUB(long_branch_any_any) \ | |
240 | DEF_STUB(long_branch_v4t_arm_thumb) \ | |
241 | DEF_STUB(long_branch_thumb_only) \ | |
242 | DEF_STUB(long_branch_v4t_thumb_thumb) \ | |
243 | DEF_STUB(long_branch_v4t_thumb_arm) \ | |
244 | DEF_STUB(short_branch_v4t_thumb_arm) \ | |
245 | DEF_STUB(long_branch_any_arm_pic) \ | |
246 | DEF_STUB(long_branch_any_thumb_pic) \ | |
247 | DEF_STUB(long_branch_v4t_thumb_thumb_pic) \ | |
248 | DEF_STUB(long_branch_v4t_arm_thumb_pic) \ | |
249 | DEF_STUB(long_branch_v4t_thumb_arm_pic) \ | |
250 | DEF_STUB(long_branch_thumb_only_pic) \ | |
251 | DEF_STUB(a8_veneer_b_cond) \ | |
252 | DEF_STUB(a8_veneer_b) \ | |
253 | DEF_STUB(a8_veneer_bl) \ | |
254 | DEF_STUB(a8_veneer_blx) | |
255 | ||
256 | // Stub types. | |
257 | ||
258 | #define DEF_STUB(x) arm_stub_##x, | |
259 | typedef enum | |
260 | { | |
261 | arm_stub_none, | |
262 | DEF_STUBS | |
263 | ||
264 | // First reloc stub type. | |
265 | arm_stub_reloc_first = arm_stub_long_branch_any_any, | |
266 | // Last reloc stub type. | |
267 | arm_stub_reloc_last = arm_stub_long_branch_thumb_only_pic, | |
268 | ||
269 | // First Cortex-A8 stub type. | |
270 | arm_stub_cortex_a8_first = arm_stub_a8_veneer_b_cond, | |
271 | // Last Cortex-A8 stub type. | |
272 | arm_stub_cortex_a8_last = arm_stub_a8_veneer_blx, | |
273 | ||
274 | // Last stub type. | |
275 | arm_stub_type_last = arm_stub_a8_veneer_blx | |
276 | } Stub_type; | |
277 | #undef DEF_STUB | |
278 | ||
279 | // Stub template class. Templates are meant to be read-only objects. | |
280 | // A stub template for a stub type contains all read-only attributes | |
281 | // common to all stubs of the same type. | |
282 | ||
283 | class Stub_template | |
284 | { | |
285 | public: | |
286 | Stub_template(Stub_type, const Insn_template*, size_t); | |
287 | ||
288 | ~Stub_template() | |
289 | { } | |
290 | ||
291 | // Return stub type. | |
292 | Stub_type | |
293 | type() const | |
294 | { return this->type_; } | |
295 | ||
296 | // Return an array of instruction templates. | |
297 | const Insn_template* | |
298 | insns() const | |
299 | { return this->insns_; } | |
300 | ||
301 | // Return size of template in number of instructions. | |
302 | size_t | |
303 | insn_count() const | |
304 | { return this->insn_count_; } | |
305 | ||
306 | // Return size of template in bytes. | |
307 | size_t | |
308 | size() const | |
309 | { return this->size_; } | |
310 | ||
311 | // Return alignment of the stub template. | |
312 | unsigned | |
313 | alignment() const | |
314 | { return this->alignment_; } | |
315 | ||
316 | // Return whether entry point is in thumb mode. | |
317 | bool | |
318 | entry_in_thumb_mode() const | |
319 | { return this->entry_in_thumb_mode_; } | |
320 | ||
321 | // Return number of relocations in this template. | |
322 | size_t | |
323 | reloc_count() const | |
324 | { return this->relocs_.size(); } | |
325 | ||
326 | // Return index of the I-th instruction with relocation. | |
327 | size_t | |
328 | reloc_insn_index(size_t i) const | |
329 | { | |
330 | gold_assert(i < this->relocs_.size()); | |
331 | return this->relocs_[i].first; | |
332 | } | |
333 | ||
334 | // Return the offset of the I-th instruction with relocation from the | |
335 | // beginning of the stub. | |
336 | section_size_type | |
337 | reloc_offset(size_t i) const | |
338 | { | |
339 | gold_assert(i < this->relocs_.size()); | |
340 | return this->relocs_[i].second; | |
341 | } | |
342 | ||
343 | private: | |
344 | // This contains information about an instruction template with a relocation | |
345 | // and its offset from start of stub. | |
346 | typedef std::pair<size_t, section_size_type> Reloc; | |
347 | ||
348 | // A Stub_template may not be copied. We want to share templates as much | |
349 | // as possible. | |
350 | Stub_template(const Stub_template&); | |
351 | Stub_template& operator=(const Stub_template&); | |
352 | ||
353 | // Stub type. | |
354 | Stub_type type_; | |
355 | // Points to an array of Insn_templates. | |
356 | const Insn_template* insns_; | |
357 | // Number of Insn_templates in insns_[]. | |
358 | size_t insn_count_; | |
359 | // Size of templated instructions in bytes. | |
360 | size_t size_; | |
361 | // Alignment of templated instructions. | |
362 | unsigned alignment_; | |
363 | // Flag to indicate if entry is in thumb mode. | |
364 | bool entry_in_thumb_mode_; | |
365 | // A table of reloc instruction indices and offsets. We can find these by | |
366 | // looking at the instruction templates but we pre-compute and then stash | |
367 | // them here for speed. | |
368 | std::vector<Reloc> relocs_; | |
369 | }; | |
370 | ||
371 | // | |
372 | // A class for code stubs. This is a base class for different type of | |
373 | // stubs used in the ARM target. | |
374 | // | |
375 | ||
376 | class Stub | |
377 | { | |
378 | private: | |
379 | static const section_offset_type invalid_offset = | |
380 | static_cast<section_offset_type>(-1); | |
381 | ||
382 | public: | |
2ea97941 ILT |
383 | Stub(const Stub_template* stub_template) |
384 | : stub_template_(stub_template), offset_(invalid_offset) | |
b569affa DK |
385 | { } |
386 | ||
387 | virtual | |
388 | ~Stub() | |
389 | { } | |
390 | ||
391 | // Return the stub template. | |
392 | const Stub_template* | |
393 | stub_template() const | |
394 | { return this->stub_template_; } | |
395 | ||
396 | // Return offset of code stub from beginning of its containing stub table. | |
397 | section_offset_type | |
398 | offset() const | |
399 | { | |
400 | gold_assert(this->offset_ != invalid_offset); | |
401 | return this->offset_; | |
402 | } | |
403 | ||
404 | // Set offset of code stub from beginning of its containing stub table. | |
405 | void | |
2ea97941 ILT |
406 | set_offset(section_offset_type offset) |
407 | { this->offset_ = offset; } | |
b569affa DK |
408 | |
409 | // Return the relocation target address of the i-th relocation in the | |
410 | // stub. This must be defined in a child class. | |
411 | Arm_address | |
412 | reloc_target(size_t i) | |
413 | { return this->do_reloc_target(i); } | |
414 | ||
415 | // Write a stub at output VIEW. BIG_ENDIAN select how a stub is written. | |
416 | void | |
417 | write(unsigned char* view, section_size_type view_size, bool big_endian) | |
418 | { this->do_write(view, view_size, big_endian); } | |
419 | ||
bb0d3eb0 DK |
420 | // Return the instruction for THUMB16_SPECIAL_TYPE instruction template |
421 | // for the i-th instruction. | |
422 | uint16_t | |
423 | thumb16_special(size_t i) | |
424 | { return this->do_thumb16_special(i); } | |
425 | ||
b569affa DK |
426 | protected: |
427 | // This must be defined in the child class. | |
428 | virtual Arm_address | |
429 | do_reloc_target(size_t) = 0; | |
430 | ||
bb0d3eb0 | 431 | // This may be overridden in the child class. |
b569affa | 432 | virtual void |
bb0d3eb0 DK |
433 | do_write(unsigned char* view, section_size_type view_size, bool big_endian) |
434 | { | |
435 | if (big_endian) | |
436 | this->do_fixed_endian_write<true>(view, view_size); | |
437 | else | |
438 | this->do_fixed_endian_write<false>(view, view_size); | |
439 | } | |
b569affa | 440 | |
bb0d3eb0 DK |
441 | // This must be overridden if a child class uses the THUMB16_SPECIAL_TYPE |
442 | // instruction template. | |
443 | virtual uint16_t | |
444 | do_thumb16_special(size_t) | |
445 | { gold_unreachable(); } | |
446 | ||
b569affa | 447 | private: |
bb0d3eb0 DK |
448 | // A template to implement do_write. |
449 | template<bool big_endian> | |
450 | void inline | |
451 | do_fixed_endian_write(unsigned char*, section_size_type); | |
452 | ||
b569affa DK |
453 | // Its template. |
454 | const Stub_template* stub_template_; | |
455 | // Offset within the section of containing this stub. | |
456 | section_offset_type offset_; | |
457 | }; | |
458 | ||
459 | // Reloc stub class. These are stubs we use to fix up relocation because | |
460 | // of limited branch ranges. | |
461 | ||
462 | class Reloc_stub : public Stub | |
463 | { | |
464 | public: | |
465 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); | |
466 | // We assume we never jump to this address. | |
467 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
468 | ||
469 | // Return destination address. | |
470 | Arm_address | |
471 | destination_address() const | |
472 | { | |
473 | gold_assert(this->destination_address_ != this->invalid_address); | |
474 | return this->destination_address_; | |
475 | } | |
476 | ||
477 | // Set destination address. | |
478 | void | |
479 | set_destination_address(Arm_address address) | |
480 | { | |
481 | gold_assert(address != this->invalid_address); | |
482 | this->destination_address_ = address; | |
483 | } | |
484 | ||
485 | // Reset destination address. | |
486 | void | |
487 | reset_destination_address() | |
488 | { this->destination_address_ = this->invalid_address; } | |
489 | ||
490 | // Determine stub type for a branch of a relocation of R_TYPE going | |
491 | // from BRANCH_ADDRESS to BRANCH_TARGET. If TARGET_IS_THUMB is set, | |
492 | // the branch target is a thumb instruction. TARGET is used for look | |
493 | // up ARM-specific linker settings. | |
494 | static Stub_type | |
495 | stub_type_for_reloc(unsigned int r_type, Arm_address branch_address, | |
496 | Arm_address branch_target, bool target_is_thumb); | |
497 | ||
498 | // Reloc_stub key. A key is logically a triplet of a stub type, a symbol | |
499 | // and an addend. Since we treat global and local symbol differently, we | |
500 | // use a Symbol object for a global symbol and a object-index pair for | |
501 | // a local symbol. | |
502 | class Key | |
503 | { | |
504 | public: | |
505 | // If SYMBOL is not null, this is a global symbol, we ignore RELOBJ and | |
506 | // R_SYM. Otherwise, this is a local symbol and RELOBJ must non-NULL | |
507 | // and R_SYM must not be invalid_index. | |
2ea97941 ILT |
508 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, |
509 | unsigned int r_sym, int32_t addend) | |
510 | : stub_type_(stub_type), addend_(addend) | |
b569affa | 511 | { |
2ea97941 | 512 | if (symbol != NULL) |
b569affa DK |
513 | { |
514 | this->r_sym_ = Reloc_stub::invalid_index; | |
2ea97941 | 515 | this->u_.symbol = symbol; |
b569affa DK |
516 | } |
517 | else | |
518 | { | |
2ea97941 ILT |
519 | gold_assert(relobj != NULL && r_sym != invalid_index); |
520 | this->r_sym_ = r_sym; | |
521 | this->u_.relobj = relobj; | |
b569affa DK |
522 | } |
523 | } | |
524 | ||
525 | ~Key() | |
526 | { } | |
527 | ||
528 | // Accessors: Keys are meant to be read-only object so no modifiers are | |
529 | // provided. | |
530 | ||
531 | // Return stub type. | |
532 | Stub_type | |
533 | stub_type() const | |
534 | { return this->stub_type_; } | |
535 | ||
536 | // Return the local symbol index or invalid_index. | |
537 | unsigned int | |
538 | r_sym() const | |
539 | { return this->r_sym_; } | |
540 | ||
541 | // Return the symbol if there is one. | |
542 | const Symbol* | |
543 | symbol() const | |
544 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
545 | ||
546 | // Return the relobj if there is one. | |
547 | const Relobj* | |
548 | relobj() const | |
549 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
550 | ||
551 | // Whether this equals to another key k. | |
552 | bool | |
553 | eq(const Key& k) const | |
554 | { | |
555 | return ((this->stub_type_ == k.stub_type_) | |
556 | && (this->r_sym_ == k.r_sym_) | |
557 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
558 | ? (this->u_.relobj == k.u_.relobj) | |
559 | : (this->u_.symbol == k.u_.symbol)) | |
560 | && (this->addend_ == k.addend_)); | |
561 | } | |
562 | ||
563 | // Return a hash value. | |
564 | size_t | |
565 | hash_value() const | |
566 | { | |
567 | return (this->stub_type_ | |
568 | ^ this->r_sym_ | |
569 | ^ gold::string_hash<char>( | |
570 | (this->r_sym_ != Reloc_stub::invalid_index) | |
571 | ? this->u_.relobj->name().c_str() | |
572 | : this->u_.symbol->name()) | |
573 | ^ this->addend_); | |
574 | } | |
575 | ||
576 | // Functors for STL associative containers. | |
577 | struct hash | |
578 | { | |
579 | size_t | |
580 | operator()(const Key& k) const | |
581 | { return k.hash_value(); } | |
582 | }; | |
583 | ||
584 | struct equal_to | |
585 | { | |
586 | bool | |
587 | operator()(const Key& k1, const Key& k2) const | |
588 | { return k1.eq(k2); } | |
589 | }; | |
590 | ||
591 | // Name of key. This is mainly for debugging. | |
592 | std::string | |
593 | name() const; | |
594 | ||
595 | private: | |
596 | // Stub type. | |
597 | Stub_type stub_type_; | |
598 | // If this is a local symbol, this is the index in the defining object. | |
599 | // Otherwise, it is invalid_index for a global symbol. | |
600 | unsigned int r_sym_; | |
601 | // If r_sym_ is invalid index. This points to a global symbol. | |
602 | // Otherwise, this points a relobj. We used the unsized and target | |
eb44217c | 603 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and |
b569affa DK |
604 | // Arm_relobj. This is done to avoid making the stub class a template |
605 | // as most of the stub machinery is endianity-neutral. However, it | |
606 | // may require a bit of casting done by users of this class. | |
607 | union | |
608 | { | |
609 | const Symbol* symbol; | |
610 | const Relobj* relobj; | |
611 | } u_; | |
612 | // Addend associated with a reloc. | |
613 | int32_t addend_; | |
614 | }; | |
615 | ||
616 | protected: | |
617 | // Reloc_stubs are created via a stub factory. So these are protected. | |
2ea97941 ILT |
618 | Reloc_stub(const Stub_template* stub_template) |
619 | : Stub(stub_template), destination_address_(invalid_address) | |
b569affa DK |
620 | { } |
621 | ||
622 | ~Reloc_stub() | |
623 | { } | |
624 | ||
625 | friend class Stub_factory; | |
626 | ||
b569affa DK |
627 | // Return the relocation target address of the i-th relocation in the |
628 | // stub. | |
629 | Arm_address | |
630 | do_reloc_target(size_t i) | |
631 | { | |
632 | // All reloc stub have only one relocation. | |
633 | gold_assert(i == 0); | |
634 | return this->destination_address_; | |
635 | } | |
636 | ||
bb0d3eb0 DK |
637 | private: |
638 | // Address of destination. | |
639 | Arm_address destination_address_; | |
640 | }; | |
b569affa | 641 | |
bb0d3eb0 DK |
642 | // Cortex-A8 stub class. We need a Cortex-A8 stub to redirect any 32-bit |
643 | // THUMB branch that meets the following conditions: | |
644 | // | |
645 | // 1. The branch straddles across a page boundary. i.e. lower 12-bit of | |
646 | // branch address is 0xffe. | |
647 | // 2. The branch target address is in the same page as the first word of the | |
648 | // branch. | |
649 | // 3. The branch follows a 32-bit instruction which is not a branch. | |
650 | // | |
651 | // To do the fix up, we need to store the address of the branch instruction | |
652 | // and its target at least. We also need to store the original branch | |
653 | // instruction bits for the condition code in a conditional branch. The | |
654 | // condition code is used in a special instruction template. We also want | |
655 | // to identify input sections needing Cortex-A8 workaround quickly. We store | |
656 | // extra information about object and section index of the code section | |
657 | // containing a branch being fixed up. The information is used to mark | |
658 | // the code section when we finalize the Cortex-A8 stubs. | |
659 | // | |
b569affa | 660 | |
bb0d3eb0 DK |
661 | class Cortex_a8_stub : public Stub |
662 | { | |
663 | public: | |
664 | ~Cortex_a8_stub() | |
665 | { } | |
666 | ||
667 | // Return the object of the code section containing the branch being fixed | |
668 | // up. | |
669 | Relobj* | |
670 | relobj() const | |
671 | { return this->relobj_; } | |
672 | ||
673 | // Return the section index of the code section containing the branch being | |
674 | // fixed up. | |
675 | unsigned int | |
676 | shndx() const | |
677 | { return this->shndx_; } | |
678 | ||
679 | // Return the source address of stub. This is the address of the original | |
680 | // branch instruction. LSB is 1 always set to indicate that it is a THUMB | |
681 | // instruction. | |
682 | Arm_address | |
683 | source_address() const | |
684 | { return this->source_address_; } | |
685 | ||
686 | // Return the destination address of the stub. This is the branch taken | |
687 | // address of the original branch instruction. LSB is 1 if it is a THUMB | |
688 | // instruction address. | |
689 | Arm_address | |
690 | destination_address() const | |
691 | { return this->destination_address_; } | |
692 | ||
693 | // Return the instruction being fixed up. | |
694 | uint32_t | |
695 | original_insn() const | |
696 | { return this->original_insn_; } | |
697 | ||
698 | protected: | |
699 | // Cortex_a8_stubs are created via a stub factory. So these are protected. | |
700 | Cortex_a8_stub(const Stub_template* stub_template, Relobj* relobj, | |
701 | unsigned int shndx, Arm_address source_address, | |
702 | Arm_address destination_address, uint32_t original_insn) | |
703 | : Stub(stub_template), relobj_(relobj), shndx_(shndx), | |
704 | source_address_(source_address | 1U), | |
705 | destination_address_(destination_address), | |
706 | original_insn_(original_insn) | |
707 | { } | |
708 | ||
709 | friend class Stub_factory; | |
710 | ||
711 | // Return the relocation target address of the i-th relocation in the | |
712 | // stub. | |
713 | Arm_address | |
714 | do_reloc_target(size_t i) | |
715 | { | |
716 | if (this->stub_template()->type() == arm_stub_a8_veneer_b_cond) | |
717 | { | |
718 | // The conditional branch veneer has two relocations. | |
719 | gold_assert(i < 2); | |
720 | return i == 0 ? this->source_address_ + 4 : this->destination_address_; | |
721 | } | |
722 | else | |
723 | { | |
724 | // All other Cortex-A8 stubs have only one relocation. | |
725 | gold_assert(i == 0); | |
726 | return this->destination_address_; | |
727 | } | |
728 | } | |
729 | ||
730 | // Return an instruction for the THUMB16_SPECIAL_TYPE instruction template. | |
731 | uint16_t | |
732 | do_thumb16_special(size_t); | |
733 | ||
734 | private: | |
735 | // Object of the code section containing the branch being fixed up. | |
736 | Relobj* relobj_; | |
737 | // Section index of the code section containing the branch begin fixed up. | |
738 | unsigned int shndx_; | |
739 | // Source address of original branch. | |
740 | Arm_address source_address_; | |
741 | // Destination address of the original branch. | |
b569affa | 742 | Arm_address destination_address_; |
bb0d3eb0 DK |
743 | // Original branch instruction. This is needed for copying the condition |
744 | // code from a condition branch to its stub. | |
745 | uint32_t original_insn_; | |
b569affa DK |
746 | }; |
747 | ||
748 | // Stub factory class. | |
749 | ||
750 | class Stub_factory | |
751 | { | |
752 | public: | |
753 | // Return the unique instance of this class. | |
754 | static const Stub_factory& | |
755 | get_instance() | |
756 | { | |
757 | static Stub_factory singleton; | |
758 | return singleton; | |
759 | } | |
760 | ||
761 | // Make a relocation stub. | |
762 | Reloc_stub* | |
763 | make_reloc_stub(Stub_type stub_type) const | |
764 | { | |
765 | gold_assert(stub_type >= arm_stub_reloc_first | |
766 | && stub_type <= arm_stub_reloc_last); | |
767 | return new Reloc_stub(this->stub_templates_[stub_type]); | |
768 | } | |
769 | ||
bb0d3eb0 DK |
770 | // Make a Cortex-A8 stub. |
771 | Cortex_a8_stub* | |
772 | make_cortex_a8_stub(Stub_type stub_type, Relobj* relobj, unsigned int shndx, | |
773 | Arm_address source, Arm_address destination, | |
774 | uint32_t original_insn) const | |
775 | { | |
776 | gold_assert(stub_type >= arm_stub_cortex_a8_first | |
777 | && stub_type <= arm_stub_cortex_a8_last); | |
778 | return new Cortex_a8_stub(this->stub_templates_[stub_type], relobj, shndx, | |
779 | source, destination, original_insn); | |
780 | } | |
781 | ||
b569affa DK |
782 | private: |
783 | // Constructor and destructor are protected since we only return a single | |
784 | // instance created in Stub_factory::get_instance(). | |
785 | ||
786 | Stub_factory(); | |
787 | ||
788 | // A Stub_factory may not be copied since it is a singleton. | |
789 | Stub_factory(const Stub_factory&); | |
790 | Stub_factory& operator=(Stub_factory&); | |
791 | ||
792 | // Stub templates. These are initialized in the constructor. | |
793 | const Stub_template* stub_templates_[arm_stub_type_last+1]; | |
794 | }; | |
795 | ||
56ee5e00 DK |
796 | // A class to hold stubs for the ARM target. |
797 | ||
798 | template<bool big_endian> | |
799 | class Stub_table : public Output_data | |
800 | { | |
801 | public: | |
2ea97941 | 802 | Stub_table(Arm_input_section<big_endian>* owner) |
2fb7225c DK |
803 | : Output_data(), owner_(owner), reloc_stubs_(), cortex_a8_stubs_(), |
804 | prev_data_size_(0), prev_addralign_(1) | |
56ee5e00 DK |
805 | { } |
806 | ||
807 | ~Stub_table() | |
808 | { } | |
809 | ||
810 | // Owner of this stub table. | |
811 | Arm_input_section<big_endian>* | |
812 | owner() const | |
813 | { return this->owner_; } | |
814 | ||
815 | // Whether this stub table is empty. | |
816 | bool | |
817 | empty() const | |
2fb7225c | 818 | { return this->reloc_stubs_.empty() && this->cortex_a8_stubs_.empty(); } |
56ee5e00 DK |
819 | |
820 | // Return the current data size. | |
821 | off_t | |
822 | current_data_size() const | |
823 | { return this->current_data_size_for_child(); } | |
824 | ||
825 | // Add a STUB with using KEY. Caller is reponsible for avoid adding | |
826 | // if already a STUB with the same key has been added. | |
827 | void | |
2fb7225c DK |
828 | add_reloc_stub(Reloc_stub* stub, const Reloc_stub::Key& key) |
829 | { | |
830 | const Stub_template* stub_template = stub->stub_template(); | |
831 | gold_assert(stub_template->type() == key.stub_type()); | |
832 | this->reloc_stubs_[key] = stub; | |
833 | } | |
834 | ||
835 | // Add a Cortex-A8 STUB that fixes up a THUMB branch at ADDRESS. | |
836 | // Caller is reponsible for avoid adding if already a STUB with the same | |
837 | // address has been added. | |
838 | void | |
839 | add_cortex_a8_stub(Arm_address address, Cortex_a8_stub* stub) | |
840 | { | |
841 | std::pair<Arm_address, Cortex_a8_stub*> value(address, stub); | |
842 | this->cortex_a8_stubs_.insert(value); | |
843 | } | |
844 | ||
845 | // Remove all Cortex-A8 stubs. | |
846 | void | |
847 | remove_all_cortex_a8_stubs(); | |
56ee5e00 DK |
848 | |
849 | // Look up a relocation stub using KEY. Return NULL if there is none. | |
850 | Reloc_stub* | |
851 | find_reloc_stub(const Reloc_stub::Key& key) const | |
852 | { | |
853 | typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.find(key); | |
854 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; | |
855 | } | |
856 | ||
857 | // Relocate stubs in this stub table. | |
858 | void | |
859 | relocate_stubs(const Relocate_info<32, big_endian>*, | |
860 | Target_arm<big_endian>*, Output_section*, | |
861 | unsigned char*, Arm_address, section_size_type); | |
862 | ||
2fb7225c DK |
863 | // Update data size and alignment at the end of a relaxation pass. Return |
864 | // true if either data size or alignment is different from that of the | |
865 | // previous relaxation pass. | |
866 | bool | |
867 | update_data_size_and_addralign(); | |
868 | ||
869 | // Finalize stubs. Set the offsets of all stubs and mark input sections | |
870 | // needing the Cortex-A8 workaround. | |
871 | void | |
872 | finalize_stubs(); | |
873 | ||
874 | // Apply Cortex-A8 workaround to an address range. | |
875 | void | |
876 | apply_cortex_a8_workaround_to_address_range(Target_arm<big_endian>*, | |
877 | unsigned char*, Arm_address, | |
878 | section_size_type); | |
879 | ||
56ee5e00 DK |
880 | protected: |
881 | // Write out section contents. | |
882 | void | |
883 | do_write(Output_file*); | |
884 | ||
885 | // Return the required alignment. | |
886 | uint64_t | |
887 | do_addralign() const | |
2fb7225c | 888 | { return this->prev_addralign_; } |
56ee5e00 DK |
889 | |
890 | // Reset address and file offset. | |
891 | void | |
2fb7225c DK |
892 | do_reset_address_and_file_offset() |
893 | { this->set_current_data_size_for_child(this->prev_data_size_); } | |
56ee5e00 | 894 | |
2fb7225c DK |
895 | // Set final data size. |
896 | void | |
897 | set_final_data_size() | |
898 | { this->set_data_size(this->current_data_size()); } | |
899 | ||
56ee5e00 | 900 | private: |
2fb7225c DK |
901 | // Relocate one stub. |
902 | void | |
903 | relocate_stub(Stub*, const Relocate_info<32, big_endian>*, | |
904 | Target_arm<big_endian>*, Output_section*, | |
905 | unsigned char*, Arm_address, section_size_type); | |
906 | ||
907 | // Unordered map of relocation stubs. | |
56ee5e00 DK |
908 | typedef |
909 | Unordered_map<Reloc_stub::Key, Reloc_stub*, Reloc_stub::Key::hash, | |
910 | Reloc_stub::Key::equal_to> | |
911 | Reloc_stub_map; | |
912 | ||
2fb7225c DK |
913 | // List of Cortex-A8 stubs ordered by addresses of branches being |
914 | // fixed up in output. | |
915 | typedef std::map<Arm_address, Cortex_a8_stub*> Cortex_a8_stub_list; | |
916 | ||
56ee5e00 DK |
917 | // Owner of this stub table. |
918 | Arm_input_section<big_endian>* owner_; | |
56ee5e00 DK |
919 | // The relocation stubs. |
920 | Reloc_stub_map reloc_stubs_; | |
2fb7225c DK |
921 | // The cortex_a8_stubs. |
922 | Cortex_a8_stub_list cortex_a8_stubs_; | |
923 | // data size of this in the previous pass. | |
924 | off_t prev_data_size_; | |
925 | // address alignment of this in the previous pass. | |
926 | uint64_t prev_addralign_; | |
56ee5e00 DK |
927 | }; |
928 | ||
10ad9fe5 DK |
929 | // A class to wrap an ordinary input section containing executable code. |
930 | ||
931 | template<bool big_endian> | |
932 | class Arm_input_section : public Output_relaxed_input_section | |
933 | { | |
934 | public: | |
2ea97941 ILT |
935 | Arm_input_section(Relobj* relobj, unsigned int shndx) |
936 | : Output_relaxed_input_section(relobj, shndx, 1), | |
10ad9fe5 DK |
937 | original_addralign_(1), original_size_(0), stub_table_(NULL) |
938 | { } | |
939 | ||
940 | ~Arm_input_section() | |
941 | { } | |
942 | ||
943 | // Initialize. | |
944 | void | |
945 | init(); | |
946 | ||
947 | // Whether this is a stub table owner. | |
948 | bool | |
949 | is_stub_table_owner() const | |
950 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } | |
951 | ||
952 | // Return the stub table. | |
953 | Stub_table<big_endian>* | |
954 | stub_table() const | |
955 | { return this->stub_table_; } | |
956 | ||
957 | // Set the stub_table. | |
958 | void | |
2ea97941 ILT |
959 | set_stub_table(Stub_table<big_endian>* stub_table) |
960 | { this->stub_table_ = stub_table; } | |
10ad9fe5 | 961 | |
07f508a2 DK |
962 | // Downcast a base pointer to an Arm_input_section pointer. This is |
963 | // not type-safe but we only use Arm_input_section not the base class. | |
964 | static Arm_input_section<big_endian>* | |
965 | as_arm_input_section(Output_relaxed_input_section* poris) | |
966 | { return static_cast<Arm_input_section<big_endian>*>(poris); } | |
967 | ||
10ad9fe5 DK |
968 | protected: |
969 | // Write data to output file. | |
970 | void | |
971 | do_write(Output_file*); | |
972 | ||
973 | // Return required alignment of this. | |
974 | uint64_t | |
975 | do_addralign() const | |
976 | { | |
977 | if (this->is_stub_table_owner()) | |
978 | return std::max(this->stub_table_->addralign(), | |
979 | this->original_addralign_); | |
980 | else | |
981 | return this->original_addralign_; | |
982 | } | |
983 | ||
984 | // Finalize data size. | |
985 | void | |
986 | set_final_data_size(); | |
987 | ||
988 | // Reset address and file offset. | |
989 | void | |
990 | do_reset_address_and_file_offset(); | |
991 | ||
992 | // Output offset. | |
993 | bool | |
2ea97941 ILT |
994 | do_output_offset(const Relobj* object, unsigned int shndx, |
995 | section_offset_type offset, | |
10ad9fe5 DK |
996 | section_offset_type* poutput) const |
997 | { | |
998 | if ((object == this->relobj()) | |
2ea97941 ILT |
999 | && (shndx == this->shndx()) |
1000 | && (offset >= 0) | |
1001 | && (convert_types<uint64_t, section_offset_type>(offset) | |
10ad9fe5 DK |
1002 | <= this->original_size_)) |
1003 | { | |
2ea97941 | 1004 | *poutput = offset; |
10ad9fe5 DK |
1005 | return true; |
1006 | } | |
1007 | else | |
1008 | return false; | |
1009 | } | |
1010 | ||
1011 | private: | |
1012 | // Copying is not allowed. | |
1013 | Arm_input_section(const Arm_input_section&); | |
1014 | Arm_input_section& operator=(const Arm_input_section&); | |
1015 | ||
1016 | // Address alignment of the original input section. | |
1017 | uint64_t original_addralign_; | |
1018 | // Section size of the original input section. | |
1019 | uint64_t original_size_; | |
1020 | // Stub table. | |
1021 | Stub_table<big_endian>* stub_table_; | |
1022 | }; | |
1023 | ||
07f508a2 DK |
1024 | // Arm output section class. This is defined mainly to add a number of |
1025 | // stub generation methods. | |
1026 | ||
1027 | template<bool big_endian> | |
1028 | class Arm_output_section : public Output_section | |
1029 | { | |
1030 | public: | |
2ea97941 ILT |
1031 | Arm_output_section(const char* name, elfcpp::Elf_Word type, |
1032 | elfcpp::Elf_Xword flags) | |
1033 | : Output_section(name, type, flags) | |
07f508a2 DK |
1034 | { } |
1035 | ||
1036 | ~Arm_output_section() | |
1037 | { } | |
1038 | ||
1039 | // Group input sections for stub generation. | |
1040 | void | |
1041 | group_sections(section_size_type, bool, Target_arm<big_endian>*); | |
1042 | ||
1043 | // Downcast a base pointer to an Arm_output_section pointer. This is | |
1044 | // not type-safe but we only use Arm_output_section not the base class. | |
1045 | static Arm_output_section<big_endian>* | |
1046 | as_arm_output_section(Output_section* os) | |
1047 | { return static_cast<Arm_output_section<big_endian>*>(os); } | |
1048 | ||
1049 | private: | |
1050 | // For convenience. | |
1051 | typedef Output_section::Input_section Input_section; | |
1052 | typedef Output_section::Input_section_list Input_section_list; | |
1053 | ||
1054 | // Create a stub group. | |
1055 | void create_stub_group(Input_section_list::const_iterator, | |
1056 | Input_section_list::const_iterator, | |
1057 | Input_section_list::const_iterator, | |
1058 | Target_arm<big_endian>*, | |
1059 | std::vector<Output_relaxed_input_section*>*); | |
1060 | }; | |
1061 | ||
8ffa3667 DK |
1062 | // Arm_relobj class. |
1063 | ||
1064 | template<bool big_endian> | |
1065 | class Arm_relobj : public Sized_relobj<32, big_endian> | |
1066 | { | |
1067 | public: | |
1068 | static const Arm_address invalid_address = static_cast<Arm_address>(-1); | |
1069 | ||
2ea97941 | 1070 | Arm_relobj(const std::string& name, Input_file* input_file, off_t offset, |
8ffa3667 | 1071 | const typename elfcpp::Ehdr<32, big_endian>& ehdr) |
2ea97941 | 1072 | : Sized_relobj<32, big_endian>(name, input_file, offset, ehdr), |
a0351a69 | 1073 | stub_tables_(), local_symbol_is_thumb_function_(), |
20138696 DK |
1074 | attributes_section_data_(NULL), mapping_symbols_info_(), |
1075 | section_has_cortex_a8_workaround_(NULL) | |
8ffa3667 DK |
1076 | { } |
1077 | ||
1078 | ~Arm_relobj() | |
a0351a69 | 1079 | { delete this->attributes_section_data_; } |
8ffa3667 DK |
1080 | |
1081 | // Return the stub table of the SHNDX-th section if there is one. | |
1082 | Stub_table<big_endian>* | |
2ea97941 | 1083 | stub_table(unsigned int shndx) const |
8ffa3667 | 1084 | { |
2ea97941 ILT |
1085 | gold_assert(shndx < this->stub_tables_.size()); |
1086 | return this->stub_tables_[shndx]; | |
8ffa3667 DK |
1087 | } |
1088 | ||
1089 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. | |
1090 | void | |
2ea97941 | 1091 | set_stub_table(unsigned int shndx, Stub_table<big_endian>* stub_table) |
8ffa3667 | 1092 | { |
2ea97941 ILT |
1093 | gold_assert(shndx < this->stub_tables_.size()); |
1094 | this->stub_tables_[shndx] = stub_table; | |
8ffa3667 DK |
1095 | } |
1096 | ||
1097 | // Whether a local symbol is a THUMB function. R_SYM is the symbol table | |
1098 | // index. This is only valid after do_count_local_symbol is called. | |
1099 | bool | |
1100 | local_symbol_is_thumb_function(unsigned int r_sym) const | |
1101 | { | |
1102 | gold_assert(r_sym < this->local_symbol_is_thumb_function_.size()); | |
1103 | return this->local_symbol_is_thumb_function_[r_sym]; | |
1104 | } | |
1105 | ||
1106 | // Scan all relocation sections for stub generation. | |
1107 | void | |
1108 | scan_sections_for_stubs(Target_arm<big_endian>*, const Symbol_table*, | |
1109 | const Layout*); | |
1110 | ||
1111 | // Convert regular input section with index SHNDX to a relaxed section. | |
1112 | void | |
2ea97941 | 1113 | convert_input_section_to_relaxed_section(unsigned shndx) |
8ffa3667 DK |
1114 | { |
1115 | // The stubs have relocations and we need to process them after writing | |
1116 | // out the stubs. So relocation now must follow section write. | |
2ea97941 | 1117 | this->invalidate_section_offset(shndx); |
8ffa3667 DK |
1118 | this->set_relocs_must_follow_section_writes(); |
1119 | } | |
1120 | ||
1121 | // Downcast a base pointer to an Arm_relobj pointer. This is | |
1122 | // not type-safe but we only use Arm_relobj not the base class. | |
1123 | static Arm_relobj<big_endian>* | |
2ea97941 ILT |
1124 | as_arm_relobj(Relobj* relobj) |
1125 | { return static_cast<Arm_relobj<big_endian>*>(relobj); } | |
8ffa3667 | 1126 | |
d5b40221 DK |
1127 | // Processor-specific flags in ELF file header. This is valid only after |
1128 | // reading symbols. | |
1129 | elfcpp::Elf_Word | |
1130 | processor_specific_flags() const | |
1131 | { return this->processor_specific_flags_; } | |
1132 | ||
a0351a69 DK |
1133 | // Attribute section data This is the contents of the .ARM.attribute section |
1134 | // if there is one. | |
1135 | const Attributes_section_data* | |
1136 | attributes_section_data() const | |
1137 | { return this->attributes_section_data_; } | |
1138 | ||
20138696 DK |
1139 | // Mapping symbol location. |
1140 | typedef std::pair<unsigned int, Arm_address> Mapping_symbol_position; | |
1141 | ||
1142 | // Functor for STL container. | |
1143 | struct Mapping_symbol_position_less | |
1144 | { | |
1145 | bool | |
1146 | operator()(const Mapping_symbol_position& p1, | |
1147 | const Mapping_symbol_position& p2) const | |
1148 | { | |
1149 | return (p1.first < p2.first | |
1150 | || (p1.first == p2.first && p1.second < p2.second)); | |
1151 | } | |
1152 | }; | |
1153 | ||
1154 | // We only care about the first character of a mapping symbol, so | |
1155 | // we only store that instead of the whole symbol name. | |
1156 | typedef std::map<Mapping_symbol_position, char, | |
1157 | Mapping_symbol_position_less> Mapping_symbols_info; | |
1158 | ||
2fb7225c DK |
1159 | // Whether a section contains any Cortex-A8 workaround. |
1160 | bool | |
1161 | section_has_cortex_a8_workaround(unsigned int shndx) const | |
1162 | { | |
1163 | return (this->section_has_cortex_a8_workaround_ != NULL | |
1164 | && (*this->section_has_cortex_a8_workaround_)[shndx]); | |
1165 | } | |
1166 | ||
1167 | // Mark a section that has Cortex-A8 workaround. | |
1168 | void | |
1169 | mark_section_for_cortex_a8_workaround(unsigned int shndx) | |
1170 | { | |
1171 | if (this->section_has_cortex_a8_workaround_ == NULL) | |
1172 | this->section_has_cortex_a8_workaround_ = | |
1173 | new std::vector<bool>(this->shnum(), false); | |
1174 | (*this->section_has_cortex_a8_workaround_)[shndx] = true; | |
1175 | } | |
1176 | ||
8ffa3667 DK |
1177 | protected: |
1178 | // Post constructor setup. | |
1179 | void | |
1180 | do_setup() | |
1181 | { | |
1182 | // Call parent's setup method. | |
1183 | Sized_relobj<32, big_endian>::do_setup(); | |
1184 | ||
1185 | // Initialize look-up tables. | |
1186 | Stub_table_list empty_stub_table_list(this->shnum(), NULL); | |
1187 | this->stub_tables_.swap(empty_stub_table_list); | |
1188 | } | |
1189 | ||
1190 | // Count the local symbols. | |
1191 | void | |
1192 | do_count_local_symbols(Stringpool_template<char>*, | |
1193 | Stringpool_template<char>*); | |
1194 | ||
1195 | void | |
43d12afe | 1196 | do_relocate_sections(const Symbol_table* symtab, const Layout* layout, |
8ffa3667 DK |
1197 | const unsigned char* pshdrs, |
1198 | typename Sized_relobj<32, big_endian>::Views* pivews); | |
1199 | ||
d5b40221 DK |
1200 | // Read the symbol information. |
1201 | void | |
1202 | do_read_symbols(Read_symbols_data* sd); | |
1203 | ||
99e5bff2 DK |
1204 | // Process relocs for garbage collection. |
1205 | void | |
1206 | do_gc_process_relocs(Symbol_table*, Layout*, Read_relocs_data*); | |
1207 | ||
8ffa3667 | 1208 | private: |
44272192 DK |
1209 | |
1210 | // Whether a section needs to be scanned for relocation stubs. | |
1211 | bool | |
1212 | section_needs_reloc_stub_scanning(const elfcpp::Shdr<32, big_endian>&, | |
1213 | const Relobj::Output_sections&, | |
1214 | const Symbol_table *); | |
1215 | ||
1216 | // Whether a section needs to be scanned for the Cortex-A8 erratum. | |
1217 | bool | |
1218 | section_needs_cortex_a8_stub_scanning(const elfcpp::Shdr<32, big_endian>&, | |
1219 | unsigned int, Output_section*, | |
1220 | const Symbol_table *); | |
1221 | ||
1222 | // Scan a section for the Cortex-A8 erratum. | |
1223 | void | |
1224 | scan_section_for_cortex_a8_erratum(const elfcpp::Shdr<32, big_endian>&, | |
1225 | unsigned int, Output_section*, | |
1226 | Target_arm<big_endian>*); | |
1227 | ||
8ffa3667 DK |
1228 | // List of stub tables. |
1229 | typedef std::vector<Stub_table<big_endian>*> Stub_table_list; | |
1230 | Stub_table_list stub_tables_; | |
1231 | // Bit vector to tell if a local symbol is a thumb function or not. | |
1232 | // This is only valid after do_count_local_symbol is called. | |
1233 | std::vector<bool> local_symbol_is_thumb_function_; | |
d5b40221 DK |
1234 | // processor-specific flags in ELF file header. |
1235 | elfcpp::Elf_Word processor_specific_flags_; | |
a0351a69 DK |
1236 | // Object attributes if there is an .ARM.attributes section or NULL. |
1237 | Attributes_section_data* attributes_section_data_; | |
20138696 DK |
1238 | // Mapping symbols information. |
1239 | Mapping_symbols_info mapping_symbols_info_; | |
2fb7225c DK |
1240 | // Bitmap to indicate sections with Cortex-A8 workaround or NULL. |
1241 | std::vector<bool>* section_has_cortex_a8_workaround_; | |
d5b40221 DK |
1242 | }; |
1243 | ||
1244 | // Arm_dynobj class. | |
1245 | ||
1246 | template<bool big_endian> | |
1247 | class Arm_dynobj : public Sized_dynobj<32, big_endian> | |
1248 | { | |
1249 | public: | |
2ea97941 | 1250 | Arm_dynobj(const std::string& name, Input_file* input_file, off_t offset, |
d5b40221 | 1251 | const elfcpp::Ehdr<32, big_endian>& ehdr) |
2ea97941 ILT |
1252 | : Sized_dynobj<32, big_endian>(name, input_file, offset, ehdr), |
1253 | processor_specific_flags_(0), attributes_section_data_(NULL) | |
d5b40221 DK |
1254 | { } |
1255 | ||
1256 | ~Arm_dynobj() | |
a0351a69 | 1257 | { delete this->attributes_section_data_; } |
d5b40221 DK |
1258 | |
1259 | // Downcast a base pointer to an Arm_relobj pointer. This is | |
1260 | // not type-safe but we only use Arm_relobj not the base class. | |
1261 | static Arm_dynobj<big_endian>* | |
1262 | as_arm_dynobj(Dynobj* dynobj) | |
1263 | { return static_cast<Arm_dynobj<big_endian>*>(dynobj); } | |
1264 | ||
1265 | // Processor-specific flags in ELF file header. This is valid only after | |
1266 | // reading symbols. | |
1267 | elfcpp::Elf_Word | |
1268 | processor_specific_flags() const | |
1269 | { return this->processor_specific_flags_; } | |
1270 | ||
a0351a69 DK |
1271 | // Attributes section data. |
1272 | const Attributes_section_data* | |
1273 | attributes_section_data() const | |
1274 | { return this->attributes_section_data_; } | |
1275 | ||
d5b40221 DK |
1276 | protected: |
1277 | // Read the symbol information. | |
1278 | void | |
1279 | do_read_symbols(Read_symbols_data* sd); | |
1280 | ||
1281 | private: | |
1282 | // processor-specific flags in ELF file header. | |
1283 | elfcpp::Elf_Word processor_specific_flags_; | |
a0351a69 DK |
1284 | // Object attributes if there is an .ARM.attributes section or NULL. |
1285 | Attributes_section_data* attributes_section_data_; | |
8ffa3667 DK |
1286 | }; |
1287 | ||
e9bbb538 DK |
1288 | // Functor to read reloc addends during stub generation. |
1289 | ||
1290 | template<int sh_type, bool big_endian> | |
1291 | struct Stub_addend_reader | |
1292 | { | |
1293 | // Return the addend for a relocation of a particular type. Depending | |
1294 | // on whether this is a REL or RELA relocation, read the addend from a | |
1295 | // view or from a Reloc object. | |
1296 | elfcpp::Elf_types<32>::Elf_Swxword | |
1297 | operator()( | |
1298 | unsigned int /* r_type */, | |
1299 | const unsigned char* /* view */, | |
1300 | const typename Reloc_types<sh_type, | |
ebd95253 | 1301 | 32, big_endian>::Reloc& /* reloc */) const; |
e9bbb538 DK |
1302 | }; |
1303 | ||
1304 | // Specialized Stub_addend_reader for SHT_REL type relocation sections. | |
1305 | ||
1306 | template<bool big_endian> | |
1307 | struct Stub_addend_reader<elfcpp::SHT_REL, big_endian> | |
1308 | { | |
1309 | elfcpp::Elf_types<32>::Elf_Swxword | |
1310 | operator()( | |
1311 | unsigned int, | |
1312 | const unsigned char*, | |
1313 | const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const; | |
1314 | }; | |
1315 | ||
1316 | // Specialized Stub_addend_reader for RELA type relocation sections. | |
1317 | // We currently do not handle RELA type relocation sections but it is trivial | |
1318 | // to implement the addend reader. This is provided for completeness and to | |
1319 | // make it easier to add support for RELA relocation sections in the future. | |
1320 | ||
1321 | template<bool big_endian> | |
1322 | struct Stub_addend_reader<elfcpp::SHT_RELA, big_endian> | |
1323 | { | |
1324 | elfcpp::Elf_types<32>::Elf_Swxword | |
1325 | operator()( | |
1326 | unsigned int, | |
1327 | const unsigned char*, | |
1328 | const typename Reloc_types<elfcpp::SHT_RELA, 32, | |
ebd95253 DK |
1329 | big_endian>::Reloc& reloc) const |
1330 | { return reloc.get_r_addend(); } | |
e9bbb538 DK |
1331 | }; |
1332 | ||
a120bc7f DK |
1333 | // Cortex_a8_reloc class. We keep record of relocation that may need |
1334 | // the Cortex-A8 erratum workaround. | |
1335 | ||
1336 | class Cortex_a8_reloc | |
1337 | { | |
1338 | public: | |
1339 | Cortex_a8_reloc(Reloc_stub* reloc_stub, unsigned r_type, | |
1340 | Arm_address destination) | |
1341 | : reloc_stub_(reloc_stub), r_type_(r_type), destination_(destination) | |
1342 | { } | |
1343 | ||
1344 | ~Cortex_a8_reloc() | |
1345 | { } | |
1346 | ||
1347 | // Accessors: This is a read-only class. | |
1348 | ||
1349 | // Return the relocation stub associated with this relocation if there is | |
1350 | // one. | |
1351 | const Reloc_stub* | |
1352 | reloc_stub() const | |
1353 | { return this->reloc_stub_; } | |
1354 | ||
1355 | // Return the relocation type. | |
1356 | unsigned int | |
1357 | r_type() const | |
1358 | { return this->r_type_; } | |
1359 | ||
1360 | // Return the destination address of the relocation. LSB stores the THUMB | |
1361 | // bit. | |
1362 | Arm_address | |
1363 | destination() const | |
1364 | { return this->destination_; } | |
1365 | ||
1366 | private: | |
1367 | // Associated relocation stub if there is one, or NULL. | |
1368 | const Reloc_stub* reloc_stub_; | |
1369 | // Relocation type. | |
1370 | unsigned int r_type_; | |
1371 | // Destination address of this relocation. LSB is used to distinguish | |
1372 | // ARM/THUMB mode. | |
1373 | Arm_address destination_; | |
1374 | }; | |
1375 | ||
c121c671 DK |
1376 | // Utilities for manipulating integers of up to 32-bits |
1377 | ||
1378 | namespace utils | |
1379 | { | |
1380 | // Sign extend an n-bit unsigned integer stored in an uint32_t into | |
1381 | // an int32_t. NO_BITS must be between 1 to 32. | |
1382 | template<int no_bits> | |
1383 | static inline int32_t | |
1384 | sign_extend(uint32_t bits) | |
1385 | { | |
96d49306 | 1386 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
1387 | if (no_bits == 32) |
1388 | return static_cast<int32_t>(bits); | |
1389 | uint32_t mask = (~((uint32_t) 0)) >> (32 - no_bits); | |
1390 | bits &= mask; | |
1391 | uint32_t top_bit = 1U << (no_bits - 1); | |
1392 | int32_t as_signed = static_cast<int32_t>(bits); | |
1393 | return (bits & top_bit) ? as_signed + (-top_bit * 2) : as_signed; | |
1394 | } | |
1395 | ||
1396 | // Detects overflow of an NO_BITS integer stored in a uint32_t. | |
1397 | template<int no_bits> | |
1398 | static inline bool | |
1399 | has_overflow(uint32_t bits) | |
1400 | { | |
96d49306 | 1401 | gold_assert(no_bits >= 0 && no_bits <= 32); |
c121c671 DK |
1402 | if (no_bits == 32) |
1403 | return false; | |
1404 | int32_t max = (1 << (no_bits - 1)) - 1; | |
1405 | int32_t min = -(1 << (no_bits - 1)); | |
1406 | int32_t as_signed = static_cast<int32_t>(bits); | |
1407 | return as_signed > max || as_signed < min; | |
1408 | } | |
1409 | ||
5e445df6 ILT |
1410 | // Detects overflow of an NO_BITS integer stored in a uint32_t when it |
1411 | // fits in the given number of bits as either a signed or unsigned value. | |
1412 | // For example, has_signed_unsigned_overflow<8> would check | |
1413 | // -128 <= bits <= 255 | |
1414 | template<int no_bits> | |
1415 | static inline bool | |
1416 | has_signed_unsigned_overflow(uint32_t bits) | |
1417 | { | |
1418 | gold_assert(no_bits >= 2 && no_bits <= 32); | |
1419 | if (no_bits == 32) | |
1420 | return false; | |
1421 | int32_t max = static_cast<int32_t>((1U << no_bits) - 1); | |
1422 | int32_t min = -(1 << (no_bits - 1)); | |
1423 | int32_t as_signed = static_cast<int32_t>(bits); | |
1424 | return as_signed > max || as_signed < min; | |
1425 | } | |
1426 | ||
c121c671 DK |
1427 | // Select bits from A and B using bits in MASK. For each n in [0..31], |
1428 | // the n-th bit in the result is chosen from the n-th bits of A and B. | |
1429 | // A zero selects A and a one selects B. | |
1430 | static inline uint32_t | |
1431 | bit_select(uint32_t a, uint32_t b, uint32_t mask) | |
1432 | { return (a & ~mask) | (b & mask); } | |
1433 | }; | |
1434 | ||
4a657b0d DK |
1435 | template<bool big_endian> |
1436 | class Target_arm : public Sized_target<32, big_endian> | |
1437 | { | |
1438 | public: | |
1439 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
1440 | Reloc_section; | |
1441 | ||
2daedcd6 DK |
1442 | // When were are relocating a stub, we pass this as the relocation number. |
1443 | static const size_t fake_relnum_for_stubs = static_cast<size_t>(-1); | |
1444 | ||
a6d1ef57 DK |
1445 | Target_arm() |
1446 | : Sized_target<32, big_endian>(&arm_info), | |
1447 | got_(NULL), plt_(NULL), got_plt_(NULL), rel_dyn_(NULL), | |
1448 | copy_relocs_(elfcpp::R_ARM_COPY), dynbss_(NULL), stub_tables_(), | |
a0351a69 DK |
1449 | stub_factory_(Stub_factory::get_instance()), may_use_blx_(false), |
1450 | should_force_pic_veneer_(false), arm_input_section_map_(), | |
a120bc7f DK |
1451 | attributes_section_data_(NULL), fix_cortex_a8_(false), |
1452 | cortex_a8_relocs_info_() | |
a6d1ef57 | 1453 | { } |
4a657b0d | 1454 | |
b569affa DK |
1455 | // Whether we can use BLX. |
1456 | bool | |
1457 | may_use_blx() const | |
1458 | { return this->may_use_blx_; } | |
1459 | ||
1460 | // Set use-BLX flag. | |
1461 | void | |
1462 | set_may_use_blx(bool value) | |
1463 | { this->may_use_blx_ = value; } | |
1464 | ||
1465 | // Whether we force PCI branch veneers. | |
1466 | bool | |
1467 | should_force_pic_veneer() const | |
1468 | { return this->should_force_pic_veneer_; } | |
1469 | ||
1470 | // Set PIC veneer flag. | |
1471 | void | |
1472 | set_should_force_pic_veneer(bool value) | |
1473 | { this->should_force_pic_veneer_ = value; } | |
1474 | ||
1475 | // Whether we use THUMB-2 instructions. | |
1476 | bool | |
1477 | using_thumb2() const | |
1478 | { | |
a0351a69 DK |
1479 | Object_attribute* attr = |
1480 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1481 | int arch = attr->int_value(); | |
1482 | return arch == elfcpp::TAG_CPU_ARCH_V6T2 || arch >= elfcpp::TAG_CPU_ARCH_V7; | |
b569affa DK |
1483 | } |
1484 | ||
1485 | // Whether we use THUMB/THUMB-2 instructions only. | |
1486 | bool | |
1487 | using_thumb_only() const | |
1488 | { | |
a0351a69 DK |
1489 | Object_attribute* attr = |
1490 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1491 | if (attr->int_value() != elfcpp::TAG_CPU_ARCH_V7 | |
1492 | && attr->int_value() != elfcpp::TAG_CPU_ARCH_V7E_M) | |
1493 | return false; | |
1494 | attr = this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile); | |
1495 | return attr->int_value() == 'M'; | |
b569affa DK |
1496 | } |
1497 | ||
d204b6e9 DK |
1498 | // Whether we have an NOP instruction. If not, use mov r0, r0 instead. |
1499 | bool | |
1500 | may_use_arm_nop() const | |
1501 | { | |
a0351a69 DK |
1502 | Object_attribute* attr = |
1503 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1504 | int arch = attr->int_value(); | |
1505 | return (arch == elfcpp::TAG_CPU_ARCH_V6T2 | |
1506 | || arch == elfcpp::TAG_CPU_ARCH_V6K | |
1507 | || arch == elfcpp::TAG_CPU_ARCH_V7 | |
1508 | || arch == elfcpp::TAG_CPU_ARCH_V7E_M); | |
d204b6e9 DK |
1509 | } |
1510 | ||
51938283 DK |
1511 | // Whether we have THUMB-2 NOP.W instruction. |
1512 | bool | |
1513 | may_use_thumb2_nop() const | |
1514 | { | |
a0351a69 DK |
1515 | Object_attribute* attr = |
1516 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); | |
1517 | int arch = attr->int_value(); | |
1518 | return (arch == elfcpp::TAG_CPU_ARCH_V6T2 | |
1519 | || arch == elfcpp::TAG_CPU_ARCH_V7 | |
1520 | || arch == elfcpp::TAG_CPU_ARCH_V7E_M); | |
51938283 DK |
1521 | } |
1522 | ||
4a657b0d DK |
1523 | // Process the relocations to determine unreferenced sections for |
1524 | // garbage collection. | |
1525 | void | |
ad0f2072 | 1526 | gc_process_relocs(Symbol_table* symtab, |
4a657b0d DK |
1527 | Layout* layout, |
1528 | Sized_relobj<32, big_endian>* object, | |
1529 | unsigned int data_shndx, | |
1530 | unsigned int sh_type, | |
1531 | const unsigned char* prelocs, | |
1532 | size_t reloc_count, | |
1533 | Output_section* output_section, | |
1534 | bool needs_special_offset_handling, | |
1535 | size_t local_symbol_count, | |
1536 | const unsigned char* plocal_symbols); | |
1537 | ||
1538 | // Scan the relocations to look for symbol adjustments. | |
1539 | void | |
ad0f2072 | 1540 | scan_relocs(Symbol_table* symtab, |
4a657b0d DK |
1541 | Layout* layout, |
1542 | Sized_relobj<32, big_endian>* object, | |
1543 | unsigned int data_shndx, | |
1544 | unsigned int sh_type, | |
1545 | const unsigned char* prelocs, | |
1546 | size_t reloc_count, | |
1547 | Output_section* output_section, | |
1548 | bool needs_special_offset_handling, | |
1549 | size_t local_symbol_count, | |
1550 | const unsigned char* plocal_symbols); | |
1551 | ||
1552 | // Finalize the sections. | |
1553 | void | |
f59f41f3 | 1554 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
4a657b0d | 1555 | |
94cdfcff | 1556 | // Return the value to use for a dynamic symbol which requires special |
4a657b0d DK |
1557 | // treatment. |
1558 | uint64_t | |
1559 | do_dynsym_value(const Symbol*) const; | |
1560 | ||
1561 | // Relocate a section. | |
1562 | void | |
1563 | relocate_section(const Relocate_info<32, big_endian>*, | |
1564 | unsigned int sh_type, | |
1565 | const unsigned char* prelocs, | |
1566 | size_t reloc_count, | |
1567 | Output_section* output_section, | |
1568 | bool needs_special_offset_handling, | |
1569 | unsigned char* view, | |
ebabffbd | 1570 | Arm_address view_address, |
364c7fa5 ILT |
1571 | section_size_type view_size, |
1572 | const Reloc_symbol_changes*); | |
4a657b0d DK |
1573 | |
1574 | // Scan the relocs during a relocatable link. | |
1575 | void | |
ad0f2072 | 1576 | scan_relocatable_relocs(Symbol_table* symtab, |
4a657b0d DK |
1577 | Layout* layout, |
1578 | Sized_relobj<32, big_endian>* object, | |
1579 | unsigned int data_shndx, | |
1580 | unsigned int sh_type, | |
1581 | const unsigned char* prelocs, | |
1582 | size_t reloc_count, | |
1583 | Output_section* output_section, | |
1584 | bool needs_special_offset_handling, | |
1585 | size_t local_symbol_count, | |
1586 | const unsigned char* plocal_symbols, | |
1587 | Relocatable_relocs*); | |
1588 | ||
1589 | // Relocate a section during a relocatable link. | |
1590 | void | |
1591 | relocate_for_relocatable(const Relocate_info<32, big_endian>*, | |
1592 | unsigned int sh_type, | |
1593 | const unsigned char* prelocs, | |
1594 | size_t reloc_count, | |
1595 | Output_section* output_section, | |
1596 | off_t offset_in_output_section, | |
1597 | const Relocatable_relocs*, | |
1598 | unsigned char* view, | |
ebabffbd | 1599 | Arm_address view_address, |
4a657b0d DK |
1600 | section_size_type view_size, |
1601 | unsigned char* reloc_view, | |
1602 | section_size_type reloc_view_size); | |
1603 | ||
1604 | // Return whether SYM is defined by the ABI. | |
1605 | bool | |
1606 | do_is_defined_by_abi(Symbol* sym) const | |
1607 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
1608 | ||
94cdfcff DK |
1609 | // Return the size of the GOT section. |
1610 | section_size_type | |
1611 | got_size() | |
1612 | { | |
1613 | gold_assert(this->got_ != NULL); | |
1614 | return this->got_->data_size(); | |
1615 | } | |
1616 | ||
4a657b0d | 1617 | // Map platform-specific reloc types |
a6d1ef57 DK |
1618 | static unsigned int |
1619 | get_real_reloc_type (unsigned int r_type); | |
4a657b0d | 1620 | |
55da9579 DK |
1621 | // |
1622 | // Methods to support stub-generations. | |
1623 | // | |
1624 | ||
1625 | // Return the stub factory | |
1626 | const Stub_factory& | |
1627 | stub_factory() const | |
1628 | { return this->stub_factory_; } | |
1629 | ||
1630 | // Make a new Arm_input_section object. | |
1631 | Arm_input_section<big_endian>* | |
1632 | new_arm_input_section(Relobj*, unsigned int); | |
1633 | ||
1634 | // Find the Arm_input_section object corresponding to the SHNDX-th input | |
1635 | // section of RELOBJ. | |
1636 | Arm_input_section<big_endian>* | |
2ea97941 | 1637 | find_arm_input_section(Relobj* relobj, unsigned int shndx) const; |
55da9579 DK |
1638 | |
1639 | // Make a new Stub_table | |
1640 | Stub_table<big_endian>* | |
1641 | new_stub_table(Arm_input_section<big_endian>*); | |
1642 | ||
eb44217c DK |
1643 | // Scan a section for stub generation. |
1644 | void | |
1645 | scan_section_for_stubs(const Relocate_info<32, big_endian>*, unsigned int, | |
1646 | const unsigned char*, size_t, Output_section*, | |
1647 | bool, const unsigned char*, Arm_address, | |
1648 | section_size_type); | |
1649 | ||
43d12afe DK |
1650 | // Relocate a stub. |
1651 | void | |
2fb7225c | 1652 | relocate_stub(Stub*, const Relocate_info<32, big_endian>*, |
43d12afe DK |
1653 | Output_section*, unsigned char*, Arm_address, |
1654 | section_size_type); | |
1655 | ||
b569affa | 1656 | // Get the default ARM target. |
43d12afe | 1657 | static Target_arm<big_endian>* |
b569affa DK |
1658 | default_target() |
1659 | { | |
1660 | gold_assert(parameters->target().machine_code() == elfcpp::EM_ARM | |
1661 | && parameters->target().is_big_endian() == big_endian); | |
43d12afe DK |
1662 | return static_cast<Target_arm<big_endian>*>( |
1663 | parameters->sized_target<32, big_endian>()); | |
b569affa DK |
1664 | } |
1665 | ||
55da9579 DK |
1666 | // Whether relocation type uses LSB to distinguish THUMB addresses. |
1667 | static bool | |
1668 | reloc_uses_thumb_bit(unsigned int r_type); | |
1669 | ||
20138696 DK |
1670 | // Whether NAME belongs to a mapping symbol. |
1671 | static bool | |
1672 | is_mapping_symbol_name(const char* name) | |
1673 | { | |
1674 | return (name | |
1675 | && name[0] == '$' | |
1676 | && (name[1] == 'a' || name[1] == 't' || name[1] == 'd') | |
1677 | && (name[2] == '\0' || name[2] == '.')); | |
1678 | } | |
1679 | ||
a120bc7f DK |
1680 | // Whether we work around the Cortex-A8 erratum. |
1681 | bool | |
1682 | fix_cortex_a8() const | |
1683 | { return this->fix_cortex_a8_; } | |
1684 | ||
44272192 DK |
1685 | // Scan a span of THUMB code section for Cortex-A8 erratum. |
1686 | void | |
1687 | scan_span_for_cortex_a8_erratum(Arm_relobj<big_endian>*, unsigned int, | |
1688 | section_size_type, section_size_type, | |
1689 | const unsigned char*, Arm_address); | |
1690 | ||
41263c05 DK |
1691 | // Apply Cortex-A8 workaround to a branch. |
1692 | void | |
1693 | apply_cortex_a8_workaround(const Cortex_a8_stub*, Arm_address, | |
1694 | unsigned char*, Arm_address); | |
1695 | ||
d5b40221 | 1696 | protected: |
eb44217c DK |
1697 | // Make an ELF object. |
1698 | Object* | |
1699 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1700 | const elfcpp::Ehdr<32, big_endian>& ehdr); | |
1701 | ||
1702 | Object* | |
1703 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1704 | const elfcpp::Ehdr<32, !big_endian>&) | |
1705 | { gold_unreachable(); } | |
1706 | ||
1707 | Object* | |
1708 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1709 | const elfcpp::Ehdr<64, false>&) | |
1710 | { gold_unreachable(); } | |
1711 | ||
1712 | Object* | |
1713 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1714 | const elfcpp::Ehdr<64, true>&) | |
1715 | { gold_unreachable(); } | |
1716 | ||
1717 | // Make an output section. | |
1718 | Output_section* | |
1719 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
1720 | elfcpp::Elf_Xword flags) | |
1721 | { return new Arm_output_section<big_endian>(name, type, flags); } | |
1722 | ||
d5b40221 DK |
1723 | void |
1724 | do_adjust_elf_header(unsigned char* view, int len) const; | |
1725 | ||
eb44217c DK |
1726 | // We only need to generate stubs, and hence perform relaxation if we are |
1727 | // not doing relocatable linking. | |
1728 | bool | |
1729 | do_may_relax() const | |
1730 | { return !parameters->options().relocatable(); } | |
1731 | ||
1732 | bool | |
1733 | do_relax(int, const Input_objects*, Symbol_table*, Layout*); | |
1734 | ||
a0351a69 DK |
1735 | // Determine whether an object attribute tag takes an integer, a |
1736 | // string or both. | |
1737 | int | |
1738 | do_attribute_arg_type(int tag) const; | |
1739 | ||
1740 | // Reorder tags during output. | |
1741 | int | |
1742 | do_attributes_order(int num) const; | |
1743 | ||
4a657b0d DK |
1744 | private: |
1745 | // The class which scans relocations. | |
1746 | class Scan | |
1747 | { | |
1748 | public: | |
1749 | Scan() | |
bec53400 | 1750 | : issued_non_pic_error_(false) |
4a657b0d DK |
1751 | { } |
1752 | ||
1753 | inline void | |
ad0f2072 | 1754 | local(Symbol_table* symtab, Layout* layout, Target_arm* target, |
4a657b0d DK |
1755 | Sized_relobj<32, big_endian>* object, |
1756 | unsigned int data_shndx, | |
1757 | Output_section* output_section, | |
1758 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1759 | const elfcpp::Sym<32, big_endian>& lsym); | |
1760 | ||
1761 | inline void | |
ad0f2072 | 1762 | global(Symbol_table* symtab, Layout* layout, Target_arm* target, |
4a657b0d DK |
1763 | Sized_relobj<32, big_endian>* object, |
1764 | unsigned int data_shndx, | |
1765 | Output_section* output_section, | |
1766 | const elfcpp::Rel<32, big_endian>& reloc, unsigned int r_type, | |
1767 | Symbol* gsym); | |
1768 | ||
1769 | private: | |
1770 | static void | |
1771 | unsupported_reloc_local(Sized_relobj<32, big_endian>*, | |
1772 | unsigned int r_type); | |
1773 | ||
1774 | static void | |
1775 | unsupported_reloc_global(Sized_relobj<32, big_endian>*, | |
1776 | unsigned int r_type, Symbol*); | |
bec53400 DK |
1777 | |
1778 | void | |
1779 | check_non_pic(Relobj*, unsigned int r_type); | |
1780 | ||
1781 | // Almost identical to Symbol::needs_plt_entry except that it also | |
1782 | // handles STT_ARM_TFUNC. | |
1783 | static bool | |
1784 | symbol_needs_plt_entry(const Symbol* sym) | |
1785 | { | |
1786 | // An undefined symbol from an executable does not need a PLT entry. | |
1787 | if (sym->is_undefined() && !parameters->options().shared()) | |
1788 | return false; | |
1789 | ||
1790 | return (!parameters->doing_static_link() | |
1791 | && (sym->type() == elfcpp::STT_FUNC | |
1792 | || sym->type() == elfcpp::STT_ARM_TFUNC) | |
1793 | && (sym->is_from_dynobj() | |
1794 | || sym->is_undefined() | |
1795 | || sym->is_preemptible())); | |
1796 | } | |
1797 | ||
1798 | // Whether we have issued an error about a non-PIC compilation. | |
1799 | bool issued_non_pic_error_; | |
4a657b0d DK |
1800 | }; |
1801 | ||
1802 | // The class which implements relocation. | |
1803 | class Relocate | |
1804 | { | |
1805 | public: | |
1806 | Relocate() | |
1807 | { } | |
1808 | ||
1809 | ~Relocate() | |
1810 | { } | |
1811 | ||
bec53400 DK |
1812 | // Return whether the static relocation needs to be applied. |
1813 | inline bool | |
1814 | should_apply_static_reloc(const Sized_symbol<32>* gsym, | |
1815 | int ref_flags, | |
1816 | bool is_32bit, | |
1817 | Output_section* output_section); | |
1818 | ||
4a657b0d DK |
1819 | // Do a relocation. Return false if the caller should not issue |
1820 | // any warnings about this relocation. | |
1821 | inline bool | |
1822 | relocate(const Relocate_info<32, big_endian>*, Target_arm*, | |
1823 | Output_section*, size_t relnum, | |
1824 | const elfcpp::Rel<32, big_endian>&, | |
1825 | unsigned int r_type, const Sized_symbol<32>*, | |
1826 | const Symbol_value<32>*, | |
ebabffbd | 1827 | unsigned char*, Arm_address, |
4a657b0d | 1828 | section_size_type); |
c121c671 DK |
1829 | |
1830 | // Return whether we want to pass flag NON_PIC_REF for this | |
f4e5969c DK |
1831 | // reloc. This means the relocation type accesses a symbol not via |
1832 | // GOT or PLT. | |
c121c671 DK |
1833 | static inline bool |
1834 | reloc_is_non_pic (unsigned int r_type) | |
1835 | { | |
1836 | switch (r_type) | |
1837 | { | |
f4e5969c DK |
1838 | // These relocation types reference GOT or PLT entries explicitly. |
1839 | case elfcpp::R_ARM_GOT_BREL: | |
1840 | case elfcpp::R_ARM_GOT_ABS: | |
1841 | case elfcpp::R_ARM_GOT_PREL: | |
1842 | case elfcpp::R_ARM_GOT_BREL12: | |
1843 | case elfcpp::R_ARM_PLT32_ABS: | |
1844 | case elfcpp::R_ARM_TLS_GD32: | |
1845 | case elfcpp::R_ARM_TLS_LDM32: | |
1846 | case elfcpp::R_ARM_TLS_IE32: | |
1847 | case elfcpp::R_ARM_TLS_IE12GP: | |
1848 | ||
1849 | // These relocate types may use PLT entries. | |
c121c671 | 1850 | case elfcpp::R_ARM_CALL: |
f4e5969c | 1851 | case elfcpp::R_ARM_THM_CALL: |
c121c671 | 1852 | case elfcpp::R_ARM_JUMP24: |
f4e5969c DK |
1853 | case elfcpp::R_ARM_THM_JUMP24: |
1854 | case elfcpp::R_ARM_THM_JUMP19: | |
1855 | case elfcpp::R_ARM_PLT32: | |
1856 | case elfcpp::R_ARM_THM_XPC22: | |
c121c671 | 1857 | return false; |
f4e5969c DK |
1858 | |
1859 | default: | |
1860 | return true; | |
c121c671 DK |
1861 | } |
1862 | } | |
4a657b0d DK |
1863 | }; |
1864 | ||
1865 | // A class which returns the size required for a relocation type, | |
1866 | // used while scanning relocs during a relocatable link. | |
1867 | class Relocatable_size_for_reloc | |
1868 | { | |
1869 | public: | |
1870 | unsigned int | |
1871 | get_size_for_reloc(unsigned int, Relobj*); | |
1872 | }; | |
1873 | ||
94cdfcff DK |
1874 | // Get the GOT section, creating it if necessary. |
1875 | Output_data_got<32, big_endian>* | |
1876 | got_section(Symbol_table*, Layout*); | |
1877 | ||
1878 | // Get the GOT PLT section. | |
1879 | Output_data_space* | |
1880 | got_plt_section() const | |
1881 | { | |
1882 | gold_assert(this->got_plt_ != NULL); | |
1883 | return this->got_plt_; | |
1884 | } | |
1885 | ||
1886 | // Create a PLT entry for a global symbol. | |
1887 | void | |
1888 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1889 | ||
1890 | // Get the PLT section. | |
1891 | const Output_data_plt_arm<big_endian>* | |
1892 | plt_section() const | |
1893 | { | |
1894 | gold_assert(this->plt_ != NULL); | |
1895 | return this->plt_; | |
1896 | } | |
1897 | ||
1898 | // Get the dynamic reloc section, creating it if necessary. | |
1899 | Reloc_section* | |
1900 | rel_dyn_section(Layout*); | |
1901 | ||
1902 | // Return true if the symbol may need a COPY relocation. | |
1903 | // References from an executable object to non-function symbols | |
1904 | // defined in a dynamic object may need a COPY relocation. | |
1905 | bool | |
1906 | may_need_copy_reloc(Symbol* gsym) | |
1907 | { | |
966d4097 DK |
1908 | return (gsym->type() != elfcpp::STT_ARM_TFUNC |
1909 | && gsym->may_need_copy_reloc()); | |
94cdfcff DK |
1910 | } |
1911 | ||
1912 | // Add a potential copy relocation. | |
1913 | void | |
1914 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
1915 | Sized_relobj<32, big_endian>* object, | |
2ea97941 | 1916 | unsigned int shndx, Output_section* output_section, |
94cdfcff DK |
1917 | Symbol* sym, const elfcpp::Rel<32, big_endian>& reloc) |
1918 | { | |
1919 | this->copy_relocs_.copy_reloc(symtab, layout, | |
1920 | symtab->get_sized_symbol<32>(sym), | |
2ea97941 | 1921 | object, shndx, output_section, reloc, |
94cdfcff DK |
1922 | this->rel_dyn_section(layout)); |
1923 | } | |
1924 | ||
d5b40221 DK |
1925 | // Whether two EABI versions are compatible. |
1926 | static bool | |
1927 | are_eabi_versions_compatible(elfcpp::Elf_Word v1, elfcpp::Elf_Word v2); | |
1928 | ||
1929 | // Merge processor-specific flags from input object and those in the ELF | |
1930 | // header of the output. | |
1931 | void | |
1932 | merge_processor_specific_flags(const std::string&, elfcpp::Elf_Word); | |
1933 | ||
a0351a69 DK |
1934 | // Get the secondary compatible architecture. |
1935 | static int | |
1936 | get_secondary_compatible_arch(const Attributes_section_data*); | |
1937 | ||
1938 | // Set the secondary compatible architecture. | |
1939 | static void | |
1940 | set_secondary_compatible_arch(Attributes_section_data*, int); | |
1941 | ||
1942 | static int | |
1943 | tag_cpu_arch_combine(const char*, int, int*, int, int); | |
1944 | ||
1945 | // Helper to print AEABI enum tag value. | |
1946 | static std::string | |
1947 | aeabi_enum_name(unsigned int); | |
1948 | ||
1949 | // Return string value for TAG_CPU_name. | |
1950 | static std::string | |
1951 | tag_cpu_name_value(unsigned int); | |
1952 | ||
1953 | // Merge object attributes from input object and those in the output. | |
1954 | void | |
1955 | merge_object_attributes(const char*, const Attributes_section_data*); | |
1956 | ||
1957 | // Helper to get an AEABI object attribute | |
1958 | Object_attribute* | |
1959 | get_aeabi_object_attribute(int tag) const | |
1960 | { | |
1961 | Attributes_section_data* pasd = this->attributes_section_data_; | |
1962 | gold_assert(pasd != NULL); | |
1963 | Object_attribute* attr = | |
1964 | pasd->get_attribute(Object_attribute::OBJ_ATTR_PROC, tag); | |
1965 | gold_assert(attr != NULL); | |
1966 | return attr; | |
1967 | } | |
1968 | ||
eb44217c DK |
1969 | // |
1970 | // Methods to support stub-generations. | |
1971 | // | |
d5b40221 | 1972 | |
eb44217c DK |
1973 | // Group input sections for stub generation. |
1974 | void | |
1975 | group_sections(Layout*, section_size_type, bool); | |
d5b40221 | 1976 | |
eb44217c DK |
1977 | // Scan a relocation for stub generation. |
1978 | void | |
1979 | scan_reloc_for_stub(const Relocate_info<32, big_endian>*, unsigned int, | |
1980 | const Sized_symbol<32>*, unsigned int, | |
1981 | const Symbol_value<32>*, | |
1982 | elfcpp::Elf_types<32>::Elf_Swxword, Arm_address); | |
d5b40221 | 1983 | |
eb44217c DK |
1984 | // Scan a relocation section for stub. |
1985 | template<int sh_type> | |
1986 | void | |
1987 | scan_reloc_section_for_stubs( | |
1988 | const Relocate_info<32, big_endian>* relinfo, | |
1989 | const unsigned char* prelocs, | |
1990 | size_t reloc_count, | |
1991 | Output_section* output_section, | |
1992 | bool needs_special_offset_handling, | |
1993 | const unsigned char* view, | |
1994 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
1995 | section_size_type); | |
d5b40221 | 1996 | |
4a657b0d DK |
1997 | // Information about this specific target which we pass to the |
1998 | // general Target structure. | |
1999 | static const Target::Target_info arm_info; | |
94cdfcff DK |
2000 | |
2001 | // The types of GOT entries needed for this platform. | |
2002 | enum Got_type | |
2003 | { | |
2004 | GOT_TYPE_STANDARD = 0 // GOT entry for a regular symbol | |
2005 | }; | |
2006 | ||
55da9579 DK |
2007 | typedef typename std::vector<Stub_table<big_endian>*> Stub_table_list; |
2008 | ||
2009 | // Map input section to Arm_input_section. | |
2010 | typedef Unordered_map<Input_section_specifier, | |
2011 | Arm_input_section<big_endian>*, | |
2012 | Input_section_specifier::hash, | |
2013 | Input_section_specifier::equal_to> | |
2014 | Arm_input_section_map; | |
2015 | ||
a120bc7f DK |
2016 | // Map output addresses to relocs for Cortex-A8 erratum. |
2017 | typedef Unordered_map<Arm_address, const Cortex_a8_reloc*> | |
2018 | Cortex_a8_relocs_info; | |
2019 | ||
94cdfcff DK |
2020 | // The GOT section. |
2021 | Output_data_got<32, big_endian>* got_; | |
2022 | // The PLT section. | |
2023 | Output_data_plt_arm<big_endian>* plt_; | |
2024 | // The GOT PLT section. | |
2025 | Output_data_space* got_plt_; | |
2026 | // The dynamic reloc section. | |
2027 | Reloc_section* rel_dyn_; | |
2028 | // Relocs saved to avoid a COPY reloc. | |
2029 | Copy_relocs<elfcpp::SHT_REL, 32, big_endian> copy_relocs_; | |
2030 | // Space for variables copied with a COPY reloc. | |
2031 | Output_data_space* dynbss_; | |
55da9579 DK |
2032 | // Vector of Stub_tables created. |
2033 | Stub_table_list stub_tables_; | |
2034 | // Stub factory. | |
2035 | const Stub_factory &stub_factory_; | |
b569affa DK |
2036 | // Whether we can use BLX. |
2037 | bool may_use_blx_; | |
2038 | // Whether we force PIC branch veneers. | |
2039 | bool should_force_pic_veneer_; | |
eb44217c DK |
2040 | // Map for locating Arm_input_sections. |
2041 | Arm_input_section_map arm_input_section_map_; | |
a0351a69 DK |
2042 | // Attributes section data in output. |
2043 | Attributes_section_data* attributes_section_data_; | |
a120bc7f DK |
2044 | // Whether we want to fix code for Cortex-A8 erratum. |
2045 | bool fix_cortex_a8_; | |
2046 | // Map addresses to relocs for Cortex-A8 erratum. | |
2047 | Cortex_a8_relocs_info cortex_a8_relocs_info_; | |
4a657b0d DK |
2048 | }; |
2049 | ||
2050 | template<bool big_endian> | |
2051 | const Target::Target_info Target_arm<big_endian>::arm_info = | |
2052 | { | |
2053 | 32, // size | |
2054 | big_endian, // is_big_endian | |
2055 | elfcpp::EM_ARM, // machine_code | |
2056 | false, // has_make_symbol | |
2057 | false, // has_resolve | |
2058 | false, // has_code_fill | |
2059 | true, // is_default_stack_executable | |
2060 | '\0', // wrap_char | |
2061 | "/usr/lib/libc.so.1", // dynamic_linker | |
2062 | 0x8000, // default_text_segment_address | |
2063 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
8a5e3e08 ILT |
2064 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2065 | elfcpp::SHN_UNDEF, // small_common_shndx | |
2066 | elfcpp::SHN_UNDEF, // large_common_shndx | |
2067 | 0, // small_common_section_flags | |
05a352e6 DK |
2068 | 0, // large_common_section_flags |
2069 | ".ARM.attributes", // attributes_section | |
2070 | "aeabi" // attributes_vendor | |
4a657b0d DK |
2071 | }; |
2072 | ||
c121c671 DK |
2073 | // Arm relocate functions class |
2074 | // | |
2075 | ||
2076 | template<bool big_endian> | |
2077 | class Arm_relocate_functions : public Relocate_functions<32, big_endian> | |
2078 | { | |
2079 | public: | |
2080 | typedef enum | |
2081 | { | |
2082 | STATUS_OKAY, // No error during relocation. | |
2083 | STATUS_OVERFLOW, // Relocation oveflow. | |
2084 | STATUS_BAD_RELOC // Relocation cannot be applied. | |
2085 | } Status; | |
2086 | ||
2087 | private: | |
2088 | typedef Relocate_functions<32, big_endian> Base; | |
2089 | typedef Arm_relocate_functions<big_endian> This; | |
2090 | ||
fd3c5f0b ILT |
2091 | // Encoding of imm16 argument for movt and movw ARM instructions |
2092 | // from ARM ARM: | |
2093 | // | |
2094 | // imm16 := imm4 | imm12 | |
2095 | // | |
2096 | // 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 | |
2097 | // +-------+---------------+-------+-------+-----------------------+ | |
2098 | // | | |imm4 | |imm12 | | |
2099 | // +-------+---------------+-------+-------+-----------------------+ | |
2100 | ||
2101 | // Extract the relocation addend from VAL based on the ARM | |
2102 | // instruction encoding described above. | |
2103 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
2104 | extract_arm_movw_movt_addend( | |
2105 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
2106 | { | |
2107 | // According to the Elf ABI for ARM Architecture the immediate | |
2108 | // field is sign-extended to form the addend. | |
2109 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | (val & 0xfff)); | |
2110 | } | |
2111 | ||
2112 | // Insert X into VAL based on the ARM instruction encoding described | |
2113 | // above. | |
2114 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
2115 | insert_val_arm_movw_movt( | |
2116 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
2117 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
2118 | { | |
2119 | val &= 0xfff0f000; | |
2120 | val |= x & 0x0fff; | |
2121 | val |= (x & 0xf000) << 4; | |
2122 | return val; | |
2123 | } | |
2124 | ||
2125 | // Encoding of imm16 argument for movt and movw Thumb2 instructions | |
2126 | // from ARM ARM: | |
2127 | // | |
2128 | // imm16 := imm4 | i | imm3 | imm8 | |
2129 | // | |
2130 | // 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 | |
2131 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
2132 | // | |i| |imm4 || |imm3 | |imm8 | | |
2133 | // +---------+-+-----------+-------++-+-----+-------+---------------+ | |
2134 | ||
2135 | // Extract the relocation addend from VAL based on the Thumb2 | |
2136 | // instruction encoding described above. | |
2137 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
2138 | extract_thumb_movw_movt_addend( | |
2139 | typename elfcpp::Swap<32, big_endian>::Valtype val) | |
2140 | { | |
2141 | // According to the Elf ABI for ARM Architecture the immediate | |
2142 | // field is sign-extended to form the addend. | |
2143 | return utils::sign_extend<16>(((val >> 4) & 0xf000) | |
2144 | | ((val >> 15) & 0x0800) | |
2145 | | ((val >> 4) & 0x0700) | |
2146 | | (val & 0x00ff)); | |
2147 | } | |
2148 | ||
2149 | // Insert X into VAL based on the Thumb2 instruction encoding | |
2150 | // described above. | |
2151 | static inline typename elfcpp::Swap<32, big_endian>::Valtype | |
2152 | insert_val_thumb_movw_movt( | |
2153 | typename elfcpp::Swap<32, big_endian>::Valtype val, | |
2154 | typename elfcpp::Swap<32, big_endian>::Valtype x) | |
2155 | { | |
2156 | val &= 0xfbf08f00; | |
2157 | val |= (x & 0xf000) << 4; | |
2158 | val |= (x & 0x0800) << 15; | |
2159 | val |= (x & 0x0700) << 4; | |
2160 | val |= (x & 0x00ff); | |
2161 | return val; | |
2162 | } | |
2163 | ||
d204b6e9 DK |
2164 | // Handle ARM long branches. |
2165 | static typename This::Status | |
2166 | arm_branch_common(unsigned int, const Relocate_info<32, big_endian>*, | |
2167 | unsigned char *, const Sized_symbol<32>*, | |
2168 | const Arm_relobj<big_endian>*, unsigned int, | |
2169 | const Symbol_value<32>*, Arm_address, Arm_address, bool); | |
c121c671 | 2170 | |
51938283 DK |
2171 | // Handle THUMB long branches. |
2172 | static typename This::Status | |
2173 | thumb_branch_common(unsigned int, const Relocate_info<32, big_endian>*, | |
2174 | unsigned char *, const Sized_symbol<32>*, | |
2175 | const Arm_relobj<big_endian>*, unsigned int, | |
2176 | const Symbol_value<32>*, Arm_address, Arm_address, bool); | |
2177 | ||
c121c671 | 2178 | public: |
5e445df6 | 2179 | |
089d69dc DK |
2180 | // Return the branch offset of a 32-bit THUMB branch. |
2181 | static inline int32_t | |
2182 | thumb32_branch_offset(uint16_t upper_insn, uint16_t lower_insn) | |
2183 | { | |
2184 | // We use the Thumb-2 encoding (backwards compatible with Thumb-1) | |
2185 | // involving the J1 and J2 bits. | |
2186 | uint32_t s = (upper_insn & (1U << 10)) >> 10; | |
2187 | uint32_t upper = upper_insn & 0x3ffU; | |
2188 | uint32_t lower = lower_insn & 0x7ffU; | |
2189 | uint32_t j1 = (lower_insn & (1U << 13)) >> 13; | |
2190 | uint32_t j2 = (lower_insn & (1U << 11)) >> 11; | |
2191 | uint32_t i1 = j1 ^ s ? 0 : 1; | |
2192 | uint32_t i2 = j2 ^ s ? 0 : 1; | |
2193 | ||
2194 | return utils::sign_extend<25>((s << 24) | (i1 << 23) | (i2 << 22) | |
2195 | | (upper << 12) | (lower << 1)); | |
2196 | } | |
2197 | ||
2198 | // Insert OFFSET to a 32-bit THUMB branch and return the upper instruction. | |
2199 | // UPPER_INSN is the original upper instruction of the branch. Caller is | |
2200 | // responsible for overflow checking and BLX offset adjustment. | |
2201 | static inline uint16_t | |
2202 | thumb32_branch_upper(uint16_t upper_insn, int32_t offset) | |
2203 | { | |
2204 | uint32_t s = offset < 0 ? 1 : 0; | |
2205 | uint32_t bits = static_cast<uint32_t>(offset); | |
2206 | return (upper_insn & ~0x7ffU) | ((bits >> 12) & 0x3ffU) | (s << 10); | |
2207 | } | |
2208 | ||
2209 | // Insert OFFSET to a 32-bit THUMB branch and return the lower instruction. | |
2210 | // LOWER_INSN is the original lower instruction of the branch. Caller is | |
2211 | // responsible for overflow checking and BLX offset adjustment. | |
2212 | static inline uint16_t | |
2213 | thumb32_branch_lower(uint16_t lower_insn, int32_t offset) | |
2214 | { | |
2215 | uint32_t s = offset < 0 ? 1 : 0; | |
2216 | uint32_t bits = static_cast<uint32_t>(offset); | |
2217 | return ((lower_insn & ~0x2fffU) | |
2218 | | ((((bits >> 23) & 1) ^ !s) << 13) | |
2219 | | ((((bits >> 22) & 1) ^ !s) << 11) | |
2220 | | ((bits >> 1) & 0x7ffU)); | |
2221 | } | |
2222 | ||
2223 | // Return the branch offset of a 32-bit THUMB conditional branch. | |
2224 | static inline int32_t | |
2225 | thumb32_cond_branch_offset(uint16_t upper_insn, uint16_t lower_insn) | |
2226 | { | |
2227 | uint32_t s = (upper_insn & 0x0400U) >> 10; | |
2228 | uint32_t j1 = (lower_insn & 0x2000U) >> 13; | |
2229 | uint32_t j2 = (lower_insn & 0x0800U) >> 11; | |
2230 | uint32_t lower = (lower_insn & 0x07ffU); | |
2231 | uint32_t upper = (s << 8) | (j2 << 7) | (j1 << 6) | (upper_insn & 0x003fU); | |
2232 | ||
2233 | return utils::sign_extend<21>((upper << 12) | (lower << 1)); | |
2234 | } | |
2235 | ||
2236 | // Insert OFFSET to a 32-bit THUMB conditional branch and return the upper | |
2237 | // instruction. UPPER_INSN is the original upper instruction of the branch. | |
2238 | // Caller is responsible for overflow checking. | |
2239 | static inline uint16_t | |
2240 | thumb32_cond_branch_upper(uint16_t upper_insn, int32_t offset) | |
2241 | { | |
2242 | uint32_t s = offset < 0 ? 1 : 0; | |
2243 | uint32_t bits = static_cast<uint32_t>(offset); | |
2244 | return (upper_insn & 0xfbc0U) | (s << 10) | ((bits & 0x0003f000U) >> 12); | |
2245 | } | |
2246 | ||
2247 | // Insert OFFSET to a 32-bit THUMB conditional branch and return the lower | |
2248 | // instruction. LOWER_INSN is the original lower instruction of the branch. | |
2249 | // Caller is reponsible for overflow checking. | |
2250 | static inline uint16_t | |
2251 | thumb32_cond_branch_lower(uint16_t lower_insn, int32_t offset) | |
2252 | { | |
2253 | uint32_t bits = static_cast<uint32_t>(offset); | |
2254 | uint32_t j2 = (bits & 0x00080000U) >> 19; | |
2255 | uint32_t j1 = (bits & 0x00040000U) >> 18; | |
2256 | uint32_t lo = (bits & 0x00000ffeU) >> 1; | |
2257 | ||
2258 | return (lower_insn & 0xd000U) | (j1 << 13) | (j2 << 11) | lo; | |
2259 | } | |
2260 | ||
5e445df6 ILT |
2261 | // R_ARM_ABS8: S + A |
2262 | static inline typename This::Status | |
2263 | abs8(unsigned char *view, | |
2264 | const Sized_relobj<32, big_endian>* object, | |
be8fcb75 | 2265 | const Symbol_value<32>* psymval) |
5e445df6 ILT |
2266 | { |
2267 | typedef typename elfcpp::Swap<8, big_endian>::Valtype Valtype; | |
2268 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2269 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2270 | Valtype val = elfcpp::Swap<8, big_endian>::readval(wv); | |
2271 | Reltype addend = utils::sign_extend<8>(val); | |
2daedcd6 | 2272 | Reltype x = psymval->value(object, addend); |
5e445df6 ILT |
2273 | val = utils::bit_select(val, x, 0xffU); |
2274 | elfcpp::Swap<8, big_endian>::writeval(wv, val); | |
2275 | return (utils::has_signed_unsigned_overflow<8>(x) | |
2276 | ? This::STATUS_OVERFLOW | |
2277 | : This::STATUS_OKAY); | |
2278 | } | |
2279 | ||
be8fcb75 ILT |
2280 | // R_ARM_THM_ABS5: S + A |
2281 | static inline typename This::Status | |
2282 | thm_abs5(unsigned char *view, | |
2283 | const Sized_relobj<32, big_endian>* object, | |
2284 | const Symbol_value<32>* psymval) | |
2285 | { | |
2286 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2287 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2288 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2289 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
2290 | Reltype addend = (val & 0x7e0U) >> 6; | |
2daedcd6 | 2291 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
2292 | val = utils::bit_select(val, x << 6, 0x7e0U); |
2293 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
2294 | return (utils::has_overflow<5>(x) | |
2295 | ? This::STATUS_OVERFLOW | |
2296 | : This::STATUS_OKAY); | |
2297 | } | |
2298 | ||
2299 | // R_ARM_ABS12: S + A | |
2300 | static inline typename This::Status | |
2301 | abs12(unsigned char *view, | |
51938283 DK |
2302 | const Sized_relobj<32, big_endian>* object, |
2303 | const Symbol_value<32>* psymval) | |
be8fcb75 ILT |
2304 | { |
2305 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2306 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2307 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2308 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2309 | Reltype addend = val & 0x0fffU; | |
2daedcd6 | 2310 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
2311 | val = utils::bit_select(val, x, 0x0fffU); |
2312 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2313 | return (utils::has_overflow<12>(x) | |
2314 | ? This::STATUS_OVERFLOW | |
2315 | : This::STATUS_OKAY); | |
2316 | } | |
2317 | ||
2318 | // R_ARM_ABS16: S + A | |
2319 | static inline typename This::Status | |
2320 | abs16(unsigned char *view, | |
51938283 DK |
2321 | const Sized_relobj<32, big_endian>* object, |
2322 | const Symbol_value<32>* psymval) | |
be8fcb75 ILT |
2323 | { |
2324 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2325 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2326 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2327 | Valtype val = elfcpp::Swap<16, big_endian>::readval(wv); | |
2328 | Reltype addend = utils::sign_extend<16>(val); | |
2daedcd6 | 2329 | Reltype x = psymval->value(object, addend); |
be8fcb75 ILT |
2330 | val = utils::bit_select(val, x, 0xffffU); |
2331 | elfcpp::Swap<16, big_endian>::writeval(wv, val); | |
2332 | return (utils::has_signed_unsigned_overflow<16>(x) | |
2333 | ? This::STATUS_OVERFLOW | |
2334 | : This::STATUS_OKAY); | |
2335 | } | |
2336 | ||
c121c671 DK |
2337 | // R_ARM_ABS32: (S + A) | T |
2338 | static inline typename This::Status | |
2339 | abs32(unsigned char *view, | |
2340 | const Sized_relobj<32, big_endian>* object, | |
2341 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2342 | Arm_address thumb_bit) |
c121c671 DK |
2343 | { |
2344 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2345 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2346 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
2daedcd6 | 2347 | Valtype x = psymval->value(object, addend) | thumb_bit; |
c121c671 DK |
2348 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
2349 | return This::STATUS_OKAY; | |
2350 | } | |
2351 | ||
2352 | // R_ARM_REL32: (S + A) | T - P | |
2353 | static inline typename This::Status | |
2354 | rel32(unsigned char *view, | |
2355 | const Sized_relobj<32, big_endian>* object, | |
2356 | const Symbol_value<32>* psymval, | |
ebabffbd | 2357 | Arm_address address, |
2daedcd6 | 2358 | Arm_address thumb_bit) |
c121c671 DK |
2359 | { |
2360 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2361 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2362 | Valtype addend = elfcpp::Swap<32, big_endian>::readval(wv); | |
2daedcd6 | 2363 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c121c671 DK |
2364 | elfcpp::Swap<32, big_endian>::writeval(wv, x); |
2365 | return This::STATUS_OKAY; | |
2366 | } | |
2367 | ||
2368 | // R_ARM_THM_CALL: (S + A) | T - P | |
2369 | static inline typename This::Status | |
51938283 DK |
2370 | thm_call(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, |
2371 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
2372 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
2373 | Arm_address address, Arm_address thumb_bit, | |
2374 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2375 | { |
51938283 DK |
2376 | return thumb_branch_common(elfcpp::R_ARM_THM_CALL, relinfo, view, gsym, |
2377 | object, r_sym, psymval, address, thumb_bit, | |
2378 | is_weakly_undefined_without_plt); | |
2379 | } | |
c121c671 | 2380 | |
51938283 DK |
2381 | // R_ARM_THM_JUMP24: (S + A) | T - P |
2382 | static inline typename This::Status | |
2383 | thm_jump24(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, | |
2384 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
2385 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
2386 | Arm_address address, Arm_address thumb_bit, | |
2387 | bool is_weakly_undefined_without_plt) | |
2388 | { | |
2389 | return thumb_branch_common(elfcpp::R_ARM_THM_JUMP24, relinfo, view, gsym, | |
2390 | object, r_sym, psymval, address, thumb_bit, | |
2391 | is_weakly_undefined_without_plt); | |
2392 | } | |
2393 | ||
089d69dc DK |
2394 | // R_ARM_THM_JUMP24: (S + A) | T - P |
2395 | static typename This::Status | |
2396 | thm_jump19(unsigned char *view, const Arm_relobj<big_endian>* object, | |
2397 | const Symbol_value<32>* psymval, Arm_address address, | |
2398 | Arm_address thumb_bit); | |
2399 | ||
51938283 DK |
2400 | // R_ARM_THM_XPC22: (S + A) | T - P |
2401 | static inline typename This::Status | |
2402 | thm_xpc22(const Relocate_info<32, big_endian>* relinfo, unsigned char *view, | |
2403 | const Sized_symbol<32>* gsym, const Arm_relobj<big_endian>* object, | |
2404 | unsigned int r_sym, const Symbol_value<32>* psymval, | |
2405 | Arm_address address, Arm_address thumb_bit, | |
2406 | bool is_weakly_undefined_without_plt) | |
2407 | { | |
2408 | return thumb_branch_common(elfcpp::R_ARM_THM_XPC22, relinfo, view, gsym, | |
2409 | object, r_sym, psymval, address, thumb_bit, | |
2410 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2411 | } |
2412 | ||
2413 | // R_ARM_BASE_PREL: B(S) + A - P | |
2414 | static inline typename This::Status | |
2415 | base_prel(unsigned char* view, | |
ebabffbd DK |
2416 | Arm_address origin, |
2417 | Arm_address address) | |
c121c671 DK |
2418 | { |
2419 | Base::rel32(view, origin - address); | |
2420 | return STATUS_OKAY; | |
2421 | } | |
2422 | ||
be8fcb75 ILT |
2423 | // R_ARM_BASE_ABS: B(S) + A |
2424 | static inline typename This::Status | |
2425 | base_abs(unsigned char* view, | |
f4e5969c | 2426 | Arm_address origin) |
be8fcb75 ILT |
2427 | { |
2428 | Base::rel32(view, origin); | |
2429 | return STATUS_OKAY; | |
2430 | } | |
2431 | ||
c121c671 DK |
2432 | // R_ARM_GOT_BREL: GOT(S) + A - GOT_ORG |
2433 | static inline typename This::Status | |
2434 | got_brel(unsigned char* view, | |
2435 | typename elfcpp::Swap<32, big_endian>::Valtype got_offset) | |
2436 | { | |
2437 | Base::rel32(view, got_offset); | |
2438 | return This::STATUS_OKAY; | |
2439 | } | |
2440 | ||
f4e5969c | 2441 | // R_ARM_GOT_PREL: GOT(S) + A - P |
7f5309a5 | 2442 | static inline typename This::Status |
f4e5969c DK |
2443 | got_prel(unsigned char *view, |
2444 | Arm_address got_entry, | |
ebabffbd | 2445 | Arm_address address) |
7f5309a5 | 2446 | { |
f4e5969c | 2447 | Base::rel32(view, got_entry - address); |
7f5309a5 ILT |
2448 | return This::STATUS_OKAY; |
2449 | } | |
2450 | ||
c121c671 DK |
2451 | // R_ARM_PLT32: (S + A) | T - P |
2452 | static inline typename This::Status | |
d204b6e9 DK |
2453 | plt32(const Relocate_info<32, big_endian>* relinfo, |
2454 | unsigned char *view, | |
2455 | const Sized_symbol<32>* gsym, | |
2456 | const Arm_relobj<big_endian>* object, | |
2457 | unsigned int r_sym, | |
c121c671 | 2458 | const Symbol_value<32>* psymval, |
ebabffbd | 2459 | Arm_address address, |
d204b6e9 DK |
2460 | Arm_address thumb_bit, |
2461 | bool is_weakly_undefined_without_plt) | |
2462 | { | |
2463 | return arm_branch_common(elfcpp::R_ARM_PLT32, relinfo, view, gsym, | |
2464 | object, r_sym, psymval, address, thumb_bit, | |
2465 | is_weakly_undefined_without_plt); | |
2466 | } | |
2467 | ||
2468 | // R_ARM_XPC25: (S + A) | T - P | |
2469 | static inline typename This::Status | |
2470 | xpc25(const Relocate_info<32, big_endian>* relinfo, | |
2471 | unsigned char *view, | |
2472 | const Sized_symbol<32>* gsym, | |
2473 | const Arm_relobj<big_endian>* object, | |
2474 | unsigned int r_sym, | |
2475 | const Symbol_value<32>* psymval, | |
2476 | Arm_address address, | |
2477 | Arm_address thumb_bit, | |
2478 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2479 | { |
d204b6e9 DK |
2480 | return arm_branch_common(elfcpp::R_ARM_XPC25, relinfo, view, gsym, |
2481 | object, r_sym, psymval, address, thumb_bit, | |
2482 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2483 | } |
2484 | ||
2485 | // R_ARM_CALL: (S + A) | T - P | |
2486 | static inline typename This::Status | |
d204b6e9 DK |
2487 | call(const Relocate_info<32, big_endian>* relinfo, |
2488 | unsigned char *view, | |
2489 | const Sized_symbol<32>* gsym, | |
2490 | const Arm_relobj<big_endian>* object, | |
2491 | unsigned int r_sym, | |
c121c671 | 2492 | const Symbol_value<32>* psymval, |
ebabffbd | 2493 | Arm_address address, |
d204b6e9 DK |
2494 | Arm_address thumb_bit, |
2495 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2496 | { |
d204b6e9 DK |
2497 | return arm_branch_common(elfcpp::R_ARM_CALL, relinfo, view, gsym, |
2498 | object, r_sym, psymval, address, thumb_bit, | |
2499 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2500 | } |
2501 | ||
2502 | // R_ARM_JUMP24: (S + A) | T - P | |
2503 | static inline typename This::Status | |
d204b6e9 DK |
2504 | jump24(const Relocate_info<32, big_endian>* relinfo, |
2505 | unsigned char *view, | |
2506 | const Sized_symbol<32>* gsym, | |
2507 | const Arm_relobj<big_endian>* object, | |
2508 | unsigned int r_sym, | |
c121c671 | 2509 | const Symbol_value<32>* psymval, |
ebabffbd | 2510 | Arm_address address, |
d204b6e9 DK |
2511 | Arm_address thumb_bit, |
2512 | bool is_weakly_undefined_without_plt) | |
c121c671 | 2513 | { |
d204b6e9 DK |
2514 | return arm_branch_common(elfcpp::R_ARM_JUMP24, relinfo, view, gsym, |
2515 | object, r_sym, psymval, address, thumb_bit, | |
2516 | is_weakly_undefined_without_plt); | |
c121c671 DK |
2517 | } |
2518 | ||
2519 | // R_ARM_PREL: (S + A) | T - P | |
2520 | static inline typename This::Status | |
2521 | prel31(unsigned char *view, | |
2522 | const Sized_relobj<32, big_endian>* object, | |
2523 | const Symbol_value<32>* psymval, | |
ebabffbd | 2524 | Arm_address address, |
2daedcd6 | 2525 | Arm_address thumb_bit) |
c121c671 DK |
2526 | { |
2527 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2528 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2529 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2530 | Valtype addend = utils::sign_extend<31>(val); | |
2daedcd6 | 2531 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c121c671 DK |
2532 | val = utils::bit_select(val, x, 0x7fffffffU); |
2533 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2534 | return (utils::has_overflow<31>(x) ? | |
2535 | This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
2536 | } | |
fd3c5f0b ILT |
2537 | |
2538 | // R_ARM_MOVW_ABS_NC: (S + A) | T | |
2539 | static inline typename This::Status | |
2540 | movw_abs_nc(unsigned char *view, | |
2541 | const Sized_relobj<32, big_endian>* object, | |
2542 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2543 | Arm_address thumb_bit) |
fd3c5f0b ILT |
2544 | { |
2545 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2546 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2547 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2548 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2549 | Valtype x = psymval->value(object, addend) | thumb_bit; |
fd3c5f0b ILT |
2550 | val = This::insert_val_arm_movw_movt(val, x); |
2551 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2552 | return This::STATUS_OKAY; | |
2553 | } | |
2554 | ||
2555 | // R_ARM_MOVT_ABS: S + A | |
2556 | static inline typename This::Status | |
2557 | movt_abs(unsigned char *view, | |
2558 | const Sized_relobj<32, big_endian>* object, | |
2559 | const Symbol_value<32>* psymval) | |
2560 | { | |
2561 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2562 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2563 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2564 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2565 | Valtype x = psymval->value(object, addend) >> 16; |
fd3c5f0b ILT |
2566 | val = This::insert_val_arm_movw_movt(val, x); |
2567 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2568 | return This::STATUS_OKAY; | |
2569 | } | |
2570 | ||
2571 | // R_ARM_THM_MOVW_ABS_NC: S + A | T | |
2572 | static inline typename This::Status | |
2573 | thm_movw_abs_nc(unsigned char *view, | |
2574 | const Sized_relobj<32, big_endian>* object, | |
2575 | const Symbol_value<32>* psymval, | |
2daedcd6 | 2576 | Arm_address thumb_bit) |
fd3c5f0b ILT |
2577 | { |
2578 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2579 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2580 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2581 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2582 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
2583 | Reltype addend = extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2584 | Reltype x = psymval->value(object, addend) | thumb_bit; |
fd3c5f0b ILT |
2585 | val = This::insert_val_thumb_movw_movt(val, x); |
2586 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2587 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2588 | return This::STATUS_OKAY; | |
2589 | } | |
2590 | ||
2591 | // R_ARM_THM_MOVT_ABS: S + A | |
2592 | static inline typename This::Status | |
2593 | thm_movt_abs(unsigned char *view, | |
2594 | const Sized_relobj<32, big_endian>* object, | |
2595 | const Symbol_value<32>* psymval) | |
2596 | { | |
2597 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2598 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2599 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2600 | Reltype val = ((elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2601 | | elfcpp::Swap<16, big_endian>::readval(wv + 1)); | |
2602 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2603 | Reltype x = psymval->value(object, addend) >> 16; |
fd3c5f0b ILT |
2604 | val = This::insert_val_thumb_movw_movt(val, x); |
2605 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2606 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2607 | return This::STATUS_OKAY; | |
2608 | } | |
2609 | ||
c2a122b6 ILT |
2610 | // R_ARM_MOVW_PREL_NC: (S + A) | T - P |
2611 | static inline typename This::Status | |
2612 | movw_prel_nc(unsigned char *view, | |
2613 | const Sized_relobj<32, big_endian>* object, | |
2614 | const Symbol_value<32>* psymval, | |
ebabffbd | 2615 | Arm_address address, |
2daedcd6 | 2616 | Arm_address thumb_bit) |
c2a122b6 ILT |
2617 | { |
2618 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2619 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2620 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2621 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2622 | Valtype x = (psymval->value(object, addend) | thumb_bit) - address; |
c2a122b6 ILT |
2623 | val = This::insert_val_arm_movw_movt(val, x); |
2624 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2625 | return This::STATUS_OKAY; | |
2626 | } | |
2627 | ||
2628 | // R_ARM_MOVT_PREL: S + A - P | |
2629 | static inline typename This::Status | |
2630 | movt_prel(unsigned char *view, | |
2631 | const Sized_relobj<32, big_endian>* object, | |
2632 | const Symbol_value<32>* psymval, | |
ebabffbd | 2633 | Arm_address address) |
c2a122b6 ILT |
2634 | { |
2635 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2636 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2637 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2638 | Valtype addend = This::extract_arm_movw_movt_addend(val); | |
2daedcd6 | 2639 | Valtype x = (psymval->value(object, addend) - address) >> 16; |
c2a122b6 ILT |
2640 | val = This::insert_val_arm_movw_movt(val, x); |
2641 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2642 | return This::STATUS_OKAY; | |
2643 | } | |
2644 | ||
2645 | // R_ARM_THM_MOVW_PREL_NC: (S + A) | T - P | |
2646 | static inline typename This::Status | |
2647 | thm_movw_prel_nc(unsigned char *view, | |
2648 | const Sized_relobj<32, big_endian>* object, | |
2649 | const Symbol_value<32>* psymval, | |
ebabffbd | 2650 | Arm_address address, |
2daedcd6 | 2651 | Arm_address thumb_bit) |
c2a122b6 ILT |
2652 | { |
2653 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2654 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2655 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2656 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2657 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2658 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2659 | Reltype x = (psymval->value(object, addend) | thumb_bit) - address; |
c2a122b6 ILT |
2660 | val = This::insert_val_thumb_movw_movt(val, x); |
2661 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2662 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2663 | return This::STATUS_OKAY; | |
2664 | } | |
2665 | ||
2666 | // R_ARM_THM_MOVT_PREL: S + A - P | |
2667 | static inline typename This::Status | |
2668 | thm_movt_prel(unsigned char *view, | |
2669 | const Sized_relobj<32, big_endian>* object, | |
2670 | const Symbol_value<32>* psymval, | |
ebabffbd | 2671 | Arm_address address) |
c2a122b6 ILT |
2672 | { |
2673 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2674 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Reltype; | |
2675 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2676 | Reltype val = (elfcpp::Swap<16, big_endian>::readval(wv) << 16) | |
2677 | | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2678 | Reltype addend = This::extract_thumb_movw_movt_addend(val); | |
2daedcd6 | 2679 | Reltype x = (psymval->value(object, addend) - address) >> 16; |
c2a122b6 ILT |
2680 | val = This::insert_val_thumb_movw_movt(val, x); |
2681 | elfcpp::Swap<16, big_endian>::writeval(wv, val >> 16); | |
2682 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, val & 0xffff); | |
2683 | return This::STATUS_OKAY; | |
2684 | } | |
c121c671 DK |
2685 | }; |
2686 | ||
d204b6e9 DK |
2687 | // Relocate ARM long branches. This handles relocation types |
2688 | // R_ARM_CALL, R_ARM_JUMP24, R_ARM_PLT32 and R_ARM_XPC25. | |
2689 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2690 | // undefined and we do not use PLT in this relocation. In such a case, | |
2691 | // the branch is converted into an NOP. | |
2692 | ||
2693 | template<bool big_endian> | |
2694 | typename Arm_relocate_functions<big_endian>::Status | |
2695 | Arm_relocate_functions<big_endian>::arm_branch_common( | |
2696 | unsigned int r_type, | |
2697 | const Relocate_info<32, big_endian>* relinfo, | |
2698 | unsigned char *view, | |
2699 | const Sized_symbol<32>* gsym, | |
2700 | const Arm_relobj<big_endian>* object, | |
2701 | unsigned int r_sym, | |
2702 | const Symbol_value<32>* psymval, | |
2703 | Arm_address address, | |
2704 | Arm_address thumb_bit, | |
2705 | bool is_weakly_undefined_without_plt) | |
2706 | { | |
2707 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
2708 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2709 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
2710 | ||
2711 | bool insn_is_b = (((val >> 28) & 0xf) <= 0xe) | |
2712 | && ((val & 0x0f000000UL) == 0x0a000000UL); | |
2713 | bool insn_is_uncond_bl = (val & 0xff000000UL) == 0xeb000000UL; | |
2714 | bool insn_is_cond_bl = (((val >> 28) & 0xf) < 0xe) | |
2715 | && ((val & 0x0f000000UL) == 0x0b000000UL); | |
2716 | bool insn_is_blx = (val & 0xfe000000UL) == 0xfa000000UL; | |
2717 | bool insn_is_any_branch = (val & 0x0e000000UL) == 0x0a000000UL; | |
2718 | ||
2719 | // Check that the instruction is valid. | |
2720 | if (r_type == elfcpp::R_ARM_CALL) | |
2721 | { | |
2722 | if (!insn_is_uncond_bl && !insn_is_blx) | |
2723 | return This::STATUS_BAD_RELOC; | |
2724 | } | |
2725 | else if (r_type == elfcpp::R_ARM_JUMP24) | |
2726 | { | |
2727 | if (!insn_is_b && !insn_is_cond_bl) | |
2728 | return This::STATUS_BAD_RELOC; | |
2729 | } | |
2730 | else if (r_type == elfcpp::R_ARM_PLT32) | |
2731 | { | |
2732 | if (!insn_is_any_branch) | |
2733 | return This::STATUS_BAD_RELOC; | |
2734 | } | |
2735 | else if (r_type == elfcpp::R_ARM_XPC25) | |
2736 | { | |
2737 | // FIXME: AAELF document IH0044C does not say much about it other | |
2738 | // than it being obsolete. | |
2739 | if (!insn_is_any_branch) | |
2740 | return This::STATUS_BAD_RELOC; | |
2741 | } | |
2742 | else | |
2743 | gold_unreachable(); | |
2744 | ||
2745 | // A branch to an undefined weak symbol is turned into a jump to | |
2746 | // the next instruction unless a PLT entry will be created. | |
2747 | // Do the same for local undefined symbols. | |
2748 | // The jump to the next instruction is optimized as a NOP depending | |
2749 | // on the architecture. | |
2750 | const Target_arm<big_endian>* arm_target = | |
2751 | Target_arm<big_endian>::default_target(); | |
2752 | if (is_weakly_undefined_without_plt) | |
2753 | { | |
2754 | Valtype cond = val & 0xf0000000U; | |
2755 | if (arm_target->may_use_arm_nop()) | |
2756 | val = cond | 0x0320f000; | |
2757 | else | |
2758 | val = cond | 0x01a00000; // Using pre-UAL nop: mov r0, r0. | |
2759 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2760 | return This::STATUS_OKAY; | |
2761 | } | |
2762 | ||
2763 | Valtype addend = utils::sign_extend<26>(val << 2); | |
2764 | Valtype branch_target = psymval->value(object, addend); | |
2765 | int32_t branch_offset = branch_target - address; | |
2766 | ||
2767 | // We need a stub if the branch offset is too large or if we need | |
2768 | // to switch mode. | |
2769 | bool may_use_blx = arm_target->may_use_blx(); | |
2770 | Reloc_stub* stub = NULL; | |
2771 | if ((branch_offset > ARM_MAX_FWD_BRANCH_OFFSET) | |
2772 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
2773 | || ((thumb_bit != 0) && !(may_use_blx && r_type == elfcpp::R_ARM_CALL))) | |
2774 | { | |
2775 | Stub_type stub_type = | |
2776 | Reloc_stub::stub_type_for_reloc(r_type, address, branch_target, | |
2777 | (thumb_bit != 0)); | |
2778 | if (stub_type != arm_stub_none) | |
2779 | { | |
2ea97941 | 2780 | Stub_table<big_endian>* stub_table = |
d204b6e9 | 2781 | object->stub_table(relinfo->data_shndx); |
2ea97941 | 2782 | gold_assert(stub_table != NULL); |
d204b6e9 DK |
2783 | |
2784 | Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
2ea97941 | 2785 | stub = stub_table->find_reloc_stub(stub_key); |
d204b6e9 DK |
2786 | gold_assert(stub != NULL); |
2787 | thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0; | |
2ea97941 | 2788 | branch_target = stub_table->address() + stub->offset() + addend; |
d204b6e9 DK |
2789 | branch_offset = branch_target - address; |
2790 | gold_assert((branch_offset <= ARM_MAX_FWD_BRANCH_OFFSET) | |
2791 | && (branch_offset >= ARM_MAX_BWD_BRANCH_OFFSET)); | |
2792 | } | |
2793 | } | |
2794 | ||
2795 | // At this point, if we still need to switch mode, the instruction | |
2796 | // must either be a BLX or a BL that can be converted to a BLX. | |
2797 | if (thumb_bit != 0) | |
2798 | { | |
2799 | // Turn BL to BLX. | |
2800 | gold_assert(may_use_blx && r_type == elfcpp::R_ARM_CALL); | |
2801 | val = (val & 0xffffff) | 0xfa000000 | ((branch_offset & 2) << 23); | |
2802 | } | |
2803 | ||
2804 | val = utils::bit_select(val, (branch_offset >> 2), 0xffffffUL); | |
2805 | elfcpp::Swap<32, big_endian>::writeval(wv, val); | |
2806 | return (utils::has_overflow<26>(branch_offset) | |
2807 | ? This::STATUS_OVERFLOW : This::STATUS_OKAY); | |
2808 | } | |
2809 | ||
51938283 DK |
2810 | // Relocate THUMB long branches. This handles relocation types |
2811 | // R_ARM_THM_CALL, R_ARM_THM_JUMP24 and R_ARM_THM_XPC22. | |
2812 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2813 | // undefined and we do not use PLT in this relocation. In such a case, | |
2814 | // the branch is converted into an NOP. | |
2815 | ||
2816 | template<bool big_endian> | |
2817 | typename Arm_relocate_functions<big_endian>::Status | |
2818 | Arm_relocate_functions<big_endian>::thumb_branch_common( | |
2819 | unsigned int r_type, | |
2820 | const Relocate_info<32, big_endian>* relinfo, | |
2821 | unsigned char *view, | |
2822 | const Sized_symbol<32>* gsym, | |
2823 | const Arm_relobj<big_endian>* object, | |
2824 | unsigned int r_sym, | |
2825 | const Symbol_value<32>* psymval, | |
2826 | Arm_address address, | |
2827 | Arm_address thumb_bit, | |
2828 | bool is_weakly_undefined_without_plt) | |
2829 | { | |
2830 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2831 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2832 | uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
2833 | uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2834 | ||
2835 | // FIXME: These tests are too loose and do not take THUMB/THUMB-2 difference | |
2836 | // into account. | |
2837 | bool is_bl_insn = (lower_insn & 0x1000U) == 0x1000U; | |
2838 | bool is_blx_insn = (lower_insn & 0x1000U) == 0x0000U; | |
2839 | ||
2840 | // Check that the instruction is valid. | |
2841 | if (r_type == elfcpp::R_ARM_THM_CALL) | |
2842 | { | |
2843 | if (!is_bl_insn && !is_blx_insn) | |
2844 | return This::STATUS_BAD_RELOC; | |
2845 | } | |
2846 | else if (r_type == elfcpp::R_ARM_THM_JUMP24) | |
2847 | { | |
2848 | // This cannot be a BLX. | |
2849 | if (!is_bl_insn) | |
2850 | return This::STATUS_BAD_RELOC; | |
2851 | } | |
2852 | else if (r_type == elfcpp::R_ARM_THM_XPC22) | |
2853 | { | |
2854 | // Check for Thumb to Thumb call. | |
2855 | if (!is_blx_insn) | |
2856 | return This::STATUS_BAD_RELOC; | |
2857 | if (thumb_bit != 0) | |
2858 | { | |
2859 | gold_warning(_("%s: Thumb BLX instruction targets " | |
2860 | "thumb function '%s'."), | |
2861 | object->name().c_str(), | |
2862 | (gsym ? gsym->name() : "(local)")); | |
2863 | // Convert BLX to BL. | |
2864 | lower_insn |= 0x1000U; | |
2865 | } | |
2866 | } | |
2867 | else | |
2868 | gold_unreachable(); | |
2869 | ||
2870 | // A branch to an undefined weak symbol is turned into a jump to | |
2871 | // the next instruction unless a PLT entry will be created. | |
2872 | // The jump to the next instruction is optimized as a NOP.W for | |
2873 | // Thumb-2 enabled architectures. | |
2874 | const Target_arm<big_endian>* arm_target = | |
2875 | Target_arm<big_endian>::default_target(); | |
2876 | if (is_weakly_undefined_without_plt) | |
2877 | { | |
2878 | if (arm_target->may_use_thumb2_nop()) | |
2879 | { | |
2880 | elfcpp::Swap<16, big_endian>::writeval(wv, 0xf3af); | |
2881 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0x8000); | |
2882 | } | |
2883 | else | |
2884 | { | |
2885 | elfcpp::Swap<16, big_endian>::writeval(wv, 0xe000); | |
2886 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, 0xbf00); | |
2887 | } | |
2888 | return This::STATUS_OKAY; | |
2889 | } | |
2890 | ||
089d69dc | 2891 | int32_t addend = This::thumb32_branch_offset(upper_insn, lower_insn); |
51938283 DK |
2892 | Arm_address branch_target = psymval->value(object, addend); |
2893 | int32_t branch_offset = branch_target - address; | |
2894 | ||
2895 | // We need a stub if the branch offset is too large or if we need | |
2896 | // to switch mode. | |
2897 | bool may_use_blx = arm_target->may_use_blx(); | |
2898 | bool thumb2 = arm_target->using_thumb2(); | |
2899 | if ((!thumb2 | |
2900 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
2901 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
2902 | || (thumb2 | |
2903 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
2904 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
2905 | || ((thumb_bit == 0) | |
2906 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
2907 | || r_type == elfcpp::R_ARM_THM_JUMP24))) | |
2908 | { | |
2909 | Stub_type stub_type = | |
2910 | Reloc_stub::stub_type_for_reloc(r_type, address, branch_target, | |
2911 | (thumb_bit != 0)); | |
2912 | if (stub_type != arm_stub_none) | |
2913 | { | |
2ea97941 | 2914 | Stub_table<big_endian>* stub_table = |
51938283 | 2915 | object->stub_table(relinfo->data_shndx); |
2ea97941 | 2916 | gold_assert(stub_table != NULL); |
51938283 DK |
2917 | |
2918 | Reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
2ea97941 | 2919 | Reloc_stub* stub = stub_table->find_reloc_stub(stub_key); |
51938283 DK |
2920 | gold_assert(stub != NULL); |
2921 | thumb_bit = stub->stub_template()->entry_in_thumb_mode() ? 1 : 0; | |
2ea97941 | 2922 | branch_target = stub_table->address() + stub->offset() + addend; |
51938283 DK |
2923 | branch_offset = branch_target - address; |
2924 | } | |
2925 | } | |
2926 | ||
2927 | // At this point, if we still need to switch mode, the instruction | |
2928 | // must either be a BLX or a BL that can be converted to a BLX. | |
2929 | if (thumb_bit == 0) | |
2930 | { | |
2931 | gold_assert(may_use_blx | |
2932 | && (r_type == elfcpp::R_ARM_THM_CALL | |
2933 | || r_type == elfcpp::R_ARM_THM_XPC22)); | |
2934 | // Make sure this is a BLX. | |
2935 | lower_insn &= ~0x1000U; | |
2936 | } | |
2937 | else | |
2938 | { | |
2939 | // Make sure this is a BL. | |
2940 | lower_insn |= 0x1000U; | |
2941 | } | |
2942 | ||
51938283 DK |
2943 | if ((lower_insn & 0x5000U) == 0x4000U) |
2944 | // For a BLX instruction, make sure that the relocation is rounded up | |
2945 | // to a word boundary. This follows the semantics of the instruction | |
2946 | // which specifies that bit 1 of the target address will come from bit | |
2947 | // 1 of the base address. | |
089d69dc | 2948 | branch_offset = (branch_offset + 2) & ~3; |
51938283 DK |
2949 | |
2950 | // Put BRANCH_OFFSET back into the insn. Assumes two's complement. | |
2951 | // We use the Thumb-2 encoding, which is safe even if dealing with | |
2952 | // a Thumb-1 instruction by virtue of our overflow check above. */ | |
089d69dc DK |
2953 | upper_insn = This::thumb32_branch_upper(upper_insn, branch_offset); |
2954 | lower_insn = This::thumb32_branch_lower(lower_insn, branch_offset); | |
51938283 DK |
2955 | |
2956 | elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn); | |
2957 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn); | |
2958 | ||
2959 | return ((thumb2 | |
089d69dc DK |
2960 | ? utils::has_overflow<25>(branch_offset) |
2961 | : utils::has_overflow<23>(branch_offset)) | |
2962 | ? This::STATUS_OVERFLOW | |
2963 | : This::STATUS_OKAY); | |
2964 | } | |
2965 | ||
2966 | // Relocate THUMB-2 long conditional branches. | |
2967 | // If IS_WEAK_UNDEFINED_WITH_PLT is true. The target symbol is weakly | |
2968 | // undefined and we do not use PLT in this relocation. In such a case, | |
2969 | // the branch is converted into an NOP. | |
2970 | ||
2971 | template<bool big_endian> | |
2972 | typename Arm_relocate_functions<big_endian>::Status | |
2973 | Arm_relocate_functions<big_endian>::thm_jump19( | |
2974 | unsigned char *view, | |
2975 | const Arm_relobj<big_endian>* object, | |
2976 | const Symbol_value<32>* psymval, | |
2977 | Arm_address address, | |
2978 | Arm_address thumb_bit) | |
2979 | { | |
2980 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
2981 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
2982 | uint32_t upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
2983 | uint32_t lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
2984 | int32_t addend = This::thumb32_cond_branch_offset(upper_insn, lower_insn); | |
2985 | ||
2986 | Arm_address branch_target = psymval->value(object, addend); | |
2987 | int32_t branch_offset = branch_target - address; | |
2988 | ||
2989 | // ??? Should handle interworking? GCC might someday try to | |
2990 | // use this for tail calls. | |
2991 | // FIXME: We do support thumb entry to PLT yet. | |
2992 | if (thumb_bit == 0) | |
2993 | { | |
2994 | gold_error(_("conditional branch to PLT in THUMB-2 not supported yet.")); | |
2995 | return This::STATUS_BAD_RELOC; | |
2996 | } | |
2997 | ||
2998 | // Put RELOCATION back into the insn. | |
2999 | upper_insn = This::thumb32_cond_branch_upper(upper_insn, branch_offset); | |
3000 | lower_insn = This::thumb32_cond_branch_lower(lower_insn, branch_offset); | |
3001 | ||
3002 | // Put the relocated value back in the object file: | |
3003 | elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn); | |
3004 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn); | |
3005 | ||
3006 | return (utils::has_overflow<21>(branch_offset) | |
51938283 DK |
3007 | ? This::STATUS_OVERFLOW |
3008 | : This::STATUS_OKAY); | |
3009 | } | |
3010 | ||
94cdfcff DK |
3011 | // Get the GOT section, creating it if necessary. |
3012 | ||
3013 | template<bool big_endian> | |
3014 | Output_data_got<32, big_endian>* | |
3015 | Target_arm<big_endian>::got_section(Symbol_table* symtab, Layout* layout) | |
3016 | { | |
3017 | if (this->got_ == NULL) | |
3018 | { | |
3019 | gold_assert(symtab != NULL && layout != NULL); | |
3020 | ||
3021 | this->got_ = new Output_data_got<32, big_endian>(); | |
3022 | ||
3023 | Output_section* os; | |
3024 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
3025 | (elfcpp::SHF_ALLOC | |
3026 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
3027 | this->got_, false, true, true, |
3028 | false); | |
94cdfcff DK |
3029 | |
3030 | // The old GNU linker creates a .got.plt section. We just | |
3031 | // create another set of data in the .got section. Note that we | |
3032 | // always create a PLT if we create a GOT, although the PLT | |
3033 | // might be empty. | |
3034 | this->got_plt_ = new Output_data_space(4, "** GOT PLT"); | |
3035 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
3036 | (elfcpp::SHF_ALLOC | |
3037 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
3038 | this->got_plt_, false, false, |
3039 | false, true); | |
94cdfcff DK |
3040 | |
3041 | // The first three entries are reserved. | |
3042 | this->got_plt_->set_current_data_size(3 * 4); | |
3043 | ||
3044 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
3045 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
99fff23b | 3046 | Symbol_table::PREDEFINED, |
94cdfcff DK |
3047 | this->got_plt_, |
3048 | 0, 0, elfcpp::STT_OBJECT, | |
3049 | elfcpp::STB_LOCAL, | |
3050 | elfcpp::STV_HIDDEN, 0, | |
3051 | false, false); | |
3052 | } | |
3053 | return this->got_; | |
3054 | } | |
3055 | ||
3056 | // Get the dynamic reloc section, creating it if necessary. | |
3057 | ||
3058 | template<bool big_endian> | |
3059 | typename Target_arm<big_endian>::Reloc_section* | |
3060 | Target_arm<big_endian>::rel_dyn_section(Layout* layout) | |
3061 | { | |
3062 | if (this->rel_dyn_ == NULL) | |
3063 | { | |
3064 | gold_assert(layout != NULL); | |
3065 | this->rel_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
3066 | layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL, | |
1a2dff53 ILT |
3067 | elfcpp::SHF_ALLOC, this->rel_dyn_, true, |
3068 | false, false, false); | |
94cdfcff DK |
3069 | } |
3070 | return this->rel_dyn_; | |
3071 | } | |
3072 | ||
b569affa DK |
3073 | // Insn_template methods. |
3074 | ||
3075 | // Return byte size of an instruction template. | |
3076 | ||
3077 | size_t | |
3078 | Insn_template::size() const | |
3079 | { | |
3080 | switch (this->type()) | |
3081 | { | |
3082 | case THUMB16_TYPE: | |
2fb7225c | 3083 | case THUMB16_SPECIAL_TYPE: |
b569affa DK |
3084 | return 2; |
3085 | case ARM_TYPE: | |
3086 | case THUMB32_TYPE: | |
3087 | case DATA_TYPE: | |
3088 | return 4; | |
3089 | default: | |
3090 | gold_unreachable(); | |
3091 | } | |
3092 | } | |
3093 | ||
3094 | // Return alignment of an instruction template. | |
3095 | ||
3096 | unsigned | |
3097 | Insn_template::alignment() const | |
3098 | { | |
3099 | switch (this->type()) | |
3100 | { | |
3101 | case THUMB16_TYPE: | |
2fb7225c | 3102 | case THUMB16_SPECIAL_TYPE: |
b569affa DK |
3103 | case THUMB32_TYPE: |
3104 | return 2; | |
3105 | case ARM_TYPE: | |
3106 | case DATA_TYPE: | |
3107 | return 4; | |
3108 | default: | |
3109 | gold_unreachable(); | |
3110 | } | |
3111 | } | |
3112 | ||
3113 | // Stub_template methods. | |
3114 | ||
3115 | Stub_template::Stub_template( | |
2ea97941 ILT |
3116 | Stub_type type, const Insn_template* insns, |
3117 | size_t insn_count) | |
3118 | : type_(type), insns_(insns), insn_count_(insn_count), alignment_(1), | |
b569affa DK |
3119 | entry_in_thumb_mode_(false), relocs_() |
3120 | { | |
2ea97941 | 3121 | off_t offset = 0; |
b569affa DK |
3122 | |
3123 | // Compute byte size and alignment of stub template. | |
2ea97941 | 3124 | for (size_t i = 0; i < insn_count; i++) |
b569affa | 3125 | { |
2ea97941 ILT |
3126 | unsigned insn_alignment = insns[i].alignment(); |
3127 | size_t insn_size = insns[i].size(); | |
3128 | gold_assert((offset & (insn_alignment - 1)) == 0); | |
b569affa | 3129 | this->alignment_ = std::max(this->alignment_, insn_alignment); |
2ea97941 | 3130 | switch (insns[i].type()) |
b569affa DK |
3131 | { |
3132 | case Insn_template::THUMB16_TYPE: | |
089d69dc | 3133 | case Insn_template::THUMB16_SPECIAL_TYPE: |
b569affa DK |
3134 | if (i == 0) |
3135 | this->entry_in_thumb_mode_ = true; | |
3136 | break; | |
3137 | ||
3138 | case Insn_template::THUMB32_TYPE: | |
2ea97941 ILT |
3139 | if (insns[i].r_type() != elfcpp::R_ARM_NONE) |
3140 | this->relocs_.push_back(Reloc(i, offset)); | |
b569affa DK |
3141 | if (i == 0) |
3142 | this->entry_in_thumb_mode_ = true; | |
3143 | break; | |
3144 | ||
3145 | case Insn_template::ARM_TYPE: | |
3146 | // Handle cases where the target is encoded within the | |
3147 | // instruction. | |
2ea97941 ILT |
3148 | if (insns[i].r_type() == elfcpp::R_ARM_JUMP24) |
3149 | this->relocs_.push_back(Reloc(i, offset)); | |
b569affa DK |
3150 | break; |
3151 | ||
3152 | case Insn_template::DATA_TYPE: | |
3153 | // Entry point cannot be data. | |
3154 | gold_assert(i != 0); | |
2ea97941 | 3155 | this->relocs_.push_back(Reloc(i, offset)); |
b569affa DK |
3156 | break; |
3157 | ||
3158 | default: | |
3159 | gold_unreachable(); | |
3160 | } | |
2ea97941 | 3161 | offset += insn_size; |
b569affa | 3162 | } |
2ea97941 | 3163 | this->size_ = offset; |
b569affa DK |
3164 | } |
3165 | ||
bb0d3eb0 DK |
3166 | // Stub methods. |
3167 | ||
3168 | // Template to implement do_write for a specific target endianity. | |
3169 | ||
3170 | template<bool big_endian> | |
3171 | void inline | |
3172 | Stub::do_fixed_endian_write(unsigned char* view, section_size_type view_size) | |
3173 | { | |
3174 | const Stub_template* stub_template = this->stub_template(); | |
3175 | const Insn_template* insns = stub_template->insns(); | |
3176 | ||
3177 | // FIXME: We do not handle BE8 encoding yet. | |
3178 | unsigned char* pov = view; | |
3179 | for (size_t i = 0; i < stub_template->insn_count(); i++) | |
3180 | { | |
3181 | switch (insns[i].type()) | |
3182 | { | |
3183 | case Insn_template::THUMB16_TYPE: | |
3184 | elfcpp::Swap<16, big_endian>::writeval(pov, insns[i].data() & 0xffff); | |
3185 | break; | |
3186 | case Insn_template::THUMB16_SPECIAL_TYPE: | |
3187 | elfcpp::Swap<16, big_endian>::writeval( | |
3188 | pov, | |
3189 | this->thumb16_special(i)); | |
3190 | break; | |
3191 | case Insn_template::THUMB32_TYPE: | |
3192 | { | |
3193 | uint32_t hi = (insns[i].data() >> 16) & 0xffff; | |
3194 | uint32_t lo = insns[i].data() & 0xffff; | |
3195 | elfcpp::Swap<16, big_endian>::writeval(pov, hi); | |
3196 | elfcpp::Swap<16, big_endian>::writeval(pov + 2, lo); | |
3197 | } | |
3198 | break; | |
3199 | case Insn_template::ARM_TYPE: | |
3200 | case Insn_template::DATA_TYPE: | |
3201 | elfcpp::Swap<32, big_endian>::writeval(pov, insns[i].data()); | |
3202 | break; | |
3203 | default: | |
3204 | gold_unreachable(); | |
3205 | } | |
3206 | pov += insns[i].size(); | |
3207 | } | |
3208 | gold_assert(static_cast<section_size_type>(pov - view) == view_size); | |
3209 | } | |
3210 | ||
b569affa DK |
3211 | // Reloc_stub::Key methods. |
3212 | ||
3213 | // Dump a Key as a string for debugging. | |
3214 | ||
3215 | std::string | |
3216 | Reloc_stub::Key::name() const | |
3217 | { | |
3218 | if (this->r_sym_ == invalid_index) | |
3219 | { | |
3220 | // Global symbol key name | |
3221 | // <stub-type>:<symbol name>:<addend>. | |
3222 | const std::string sym_name = this->u_.symbol->name(); | |
3223 | // We need to print two hex number and two colons. So just add 100 bytes | |
3224 | // to the symbol name size. | |
3225 | size_t len = sym_name.size() + 100; | |
3226 | char* buffer = new char[len]; | |
3227 | int c = snprintf(buffer, len, "%d:%s:%x", this->stub_type_, | |
3228 | sym_name.c_str(), this->addend_); | |
3229 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
3230 | delete[] buffer; | |
3231 | return std::string(buffer); | |
3232 | } | |
3233 | else | |
3234 | { | |
3235 | // local symbol key name | |
3236 | // <stub-type>:<object>:<r_sym>:<addend>. | |
3237 | const size_t len = 200; | |
3238 | char buffer[len]; | |
3239 | int c = snprintf(buffer, len, "%d:%p:%u:%x", this->stub_type_, | |
3240 | this->u_.relobj, this->r_sym_, this->addend_); | |
3241 | gold_assert(c > 0 && c < static_cast<int>(len)); | |
3242 | return std::string(buffer); | |
3243 | } | |
3244 | } | |
3245 | ||
3246 | // Reloc_stub methods. | |
3247 | ||
3248 | // Determine the type of stub needed, if any, for a relocation of R_TYPE at | |
3249 | // LOCATION to DESTINATION. | |
3250 | // This code is based on the arm_type_of_stub function in | |
3251 | // bfd/elf32-arm.c. We have changed the interface a liitle to keep the Stub | |
3252 | // class simple. | |
3253 | ||
3254 | Stub_type | |
3255 | Reloc_stub::stub_type_for_reloc( | |
3256 | unsigned int r_type, | |
3257 | Arm_address location, | |
3258 | Arm_address destination, | |
3259 | bool target_is_thumb) | |
3260 | { | |
3261 | Stub_type stub_type = arm_stub_none; | |
3262 | ||
3263 | // This is a bit ugly but we want to avoid using a templated class for | |
3264 | // big and little endianities. | |
3265 | bool may_use_blx; | |
3266 | bool should_force_pic_veneer; | |
3267 | bool thumb2; | |
3268 | bool thumb_only; | |
3269 | if (parameters->target().is_big_endian()) | |
3270 | { | |
43d12afe | 3271 | const Target_arm<true>* big_endian_target = |
b569affa | 3272 | Target_arm<true>::default_target(); |
43d12afe DK |
3273 | may_use_blx = big_endian_target->may_use_blx(); |
3274 | should_force_pic_veneer = big_endian_target->should_force_pic_veneer(); | |
3275 | thumb2 = big_endian_target->using_thumb2(); | |
3276 | thumb_only = big_endian_target->using_thumb_only(); | |
b569affa DK |
3277 | } |
3278 | else | |
3279 | { | |
43d12afe | 3280 | const Target_arm<false>* little_endian_target = |
b569affa | 3281 | Target_arm<false>::default_target(); |
43d12afe DK |
3282 | may_use_blx = little_endian_target->may_use_blx(); |
3283 | should_force_pic_veneer = little_endian_target->should_force_pic_veneer(); | |
3284 | thumb2 = little_endian_target->using_thumb2(); | |
3285 | thumb_only = little_endian_target->using_thumb_only(); | |
b569affa DK |
3286 | } |
3287 | ||
3288 | int64_t branch_offset = (int64_t)destination - location; | |
3289 | ||
3290 | if (r_type == elfcpp::R_ARM_THM_CALL || r_type == elfcpp::R_ARM_THM_JUMP24) | |
3291 | { | |
3292 | // Handle cases where: | |
3293 | // - this call goes too far (different Thumb/Thumb2 max | |
3294 | // distance) | |
3295 | // - it's a Thumb->Arm call and blx is not available, or it's a | |
3296 | // Thumb->Arm branch (not bl). A stub is needed in this case. | |
3297 | if ((!thumb2 | |
3298 | && (branch_offset > THM_MAX_FWD_BRANCH_OFFSET | |
3299 | || (branch_offset < THM_MAX_BWD_BRANCH_OFFSET))) | |
3300 | || (thumb2 | |
3301 | && (branch_offset > THM2_MAX_FWD_BRANCH_OFFSET | |
3302 | || (branch_offset < THM2_MAX_BWD_BRANCH_OFFSET))) | |
3303 | || ((!target_is_thumb) | |
3304 | && (((r_type == elfcpp::R_ARM_THM_CALL) && !may_use_blx) | |
3305 | || (r_type == elfcpp::R_ARM_THM_JUMP24)))) | |
3306 | { | |
3307 | if (target_is_thumb) | |
3308 | { | |
3309 | // Thumb to thumb. | |
3310 | if (!thumb_only) | |
3311 | { | |
51938283 DK |
3312 | stub_type = (parameters->options().shared() |
3313 | || should_force_pic_veneer) | |
b569affa DK |
3314 | // PIC stubs. |
3315 | ? ((may_use_blx | |
3316 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3317 | // V5T and above. Stub starts with ARM code, so | |
3318 | // we must be able to switch mode before | |
3319 | // reaching it, which is only possible for 'bl' | |
3320 | // (ie R_ARM_THM_CALL relocation). | |
3321 | ? arm_stub_long_branch_any_thumb_pic | |
3322 | // On V4T, use Thumb code only. | |
3323 | : arm_stub_long_branch_v4t_thumb_thumb_pic) | |
3324 | ||
3325 | // non-PIC stubs. | |
3326 | : ((may_use_blx | |
3327 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3328 | ? arm_stub_long_branch_any_any // V5T and above. | |
3329 | : arm_stub_long_branch_v4t_thumb_thumb); // V4T. | |
3330 | } | |
3331 | else | |
3332 | { | |
51938283 DK |
3333 | stub_type = (parameters->options().shared() |
3334 | || should_force_pic_veneer) | |
b569affa DK |
3335 | ? arm_stub_long_branch_thumb_only_pic // PIC stub. |
3336 | : arm_stub_long_branch_thumb_only; // non-PIC stub. | |
3337 | } | |
3338 | } | |
3339 | else | |
3340 | { | |
3341 | // Thumb to arm. | |
3342 | ||
3343 | // FIXME: We should check that the input section is from an | |
3344 | // object that has interwork enabled. | |
3345 | ||
3346 | stub_type = (parameters->options().shared() | |
3347 | || should_force_pic_veneer) | |
3348 | // PIC stubs. | |
3349 | ? ((may_use_blx | |
3350 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3351 | ? arm_stub_long_branch_any_arm_pic // V5T and above. | |
3352 | : arm_stub_long_branch_v4t_thumb_arm_pic) // V4T. | |
3353 | ||
3354 | // non-PIC stubs. | |
3355 | : ((may_use_blx | |
3356 | && (r_type == elfcpp::R_ARM_THM_CALL)) | |
3357 | ? arm_stub_long_branch_any_any // V5T and above. | |
3358 | : arm_stub_long_branch_v4t_thumb_arm); // V4T. | |
3359 | ||
3360 | // Handle v4t short branches. | |
3361 | if ((stub_type == arm_stub_long_branch_v4t_thumb_arm) | |
3362 | && (branch_offset <= THM_MAX_FWD_BRANCH_OFFSET) | |
3363 | && (branch_offset >= THM_MAX_BWD_BRANCH_OFFSET)) | |
3364 | stub_type = arm_stub_short_branch_v4t_thumb_arm; | |
3365 | } | |
3366 | } | |
3367 | } | |
3368 | else if (r_type == elfcpp::R_ARM_CALL | |
3369 | || r_type == elfcpp::R_ARM_JUMP24 | |
3370 | || r_type == elfcpp::R_ARM_PLT32) | |
3371 | { | |
3372 | if (target_is_thumb) | |
3373 | { | |
3374 | // Arm to thumb. | |
3375 | ||
3376 | // FIXME: We should check that the input section is from an | |
3377 | // object that has interwork enabled. | |
3378 | ||
3379 | // We have an extra 2-bytes reach because of | |
3380 | // the mode change (bit 24 (H) of BLX encoding). | |
3381 | if (branch_offset > (ARM_MAX_FWD_BRANCH_OFFSET + 2) | |
3382 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET) | |
3383 | || ((r_type == elfcpp::R_ARM_CALL) && !may_use_blx) | |
3384 | || (r_type == elfcpp::R_ARM_JUMP24) | |
3385 | || (r_type == elfcpp::R_ARM_PLT32)) | |
3386 | { | |
3387 | stub_type = (parameters->options().shared() | |
3388 | || should_force_pic_veneer) | |
3389 | // PIC stubs. | |
3390 | ? (may_use_blx | |
3391 | ? arm_stub_long_branch_any_thumb_pic// V5T and above. | |
3392 | : arm_stub_long_branch_v4t_arm_thumb_pic) // V4T stub. | |
3393 | ||
3394 | // non-PIC stubs. | |
3395 | : (may_use_blx | |
3396 | ? arm_stub_long_branch_any_any // V5T and above. | |
3397 | : arm_stub_long_branch_v4t_arm_thumb); // V4T. | |
3398 | } | |
3399 | } | |
3400 | else | |
3401 | { | |
3402 | // Arm to arm. | |
3403 | if (branch_offset > ARM_MAX_FWD_BRANCH_OFFSET | |
3404 | || (branch_offset < ARM_MAX_BWD_BRANCH_OFFSET)) | |
3405 | { | |
3406 | stub_type = (parameters->options().shared() | |
3407 | || should_force_pic_veneer) | |
3408 | ? arm_stub_long_branch_any_arm_pic // PIC stubs. | |
3409 | : arm_stub_long_branch_any_any; /// non-PIC. | |
3410 | } | |
3411 | } | |
3412 | } | |
3413 | ||
3414 | return stub_type; | |
3415 | } | |
3416 | ||
bb0d3eb0 | 3417 | // Cortex_a8_stub methods. |
b569affa | 3418 | |
bb0d3eb0 DK |
3419 | // Return the instruction for a THUMB16_SPECIAL_TYPE instruction template. |
3420 | // I is the position of the instruction template in the stub template. | |
b569affa | 3421 | |
bb0d3eb0 DK |
3422 | uint16_t |
3423 | Cortex_a8_stub::do_thumb16_special(size_t i) | |
b569affa | 3424 | { |
bb0d3eb0 DK |
3425 | // The only use of this is to copy condition code from a conditional |
3426 | // branch being worked around to the corresponding conditional branch in | |
3427 | // to the stub. | |
3428 | gold_assert(this->stub_template()->type() == arm_stub_a8_veneer_b_cond | |
3429 | && i == 0); | |
3430 | uint16_t data = this->stub_template()->insns()[i].data(); | |
3431 | gold_assert((data & 0xff00U) == 0xd000U); | |
3432 | data |= ((this->original_insn_ >> 22) & 0xf) << 8; | |
3433 | return data; | |
b569affa DK |
3434 | } |
3435 | ||
3436 | // Stub_factory methods. | |
3437 | ||
3438 | Stub_factory::Stub_factory() | |
3439 | { | |
3440 | // The instruction template sequences are declared as static | |
3441 | // objects and initialized first time the constructor runs. | |
3442 | ||
3443 | // Arm/Thumb -> Arm/Thumb long branch stub. On V5T and above, use blx | |
3444 | // to reach the stub if necessary. | |
3445 | static const Insn_template elf32_arm_stub_long_branch_any_any[] = | |
3446 | { | |
3447 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
3448 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3449 | // dcd R_ARM_ABS32(X) | |
3450 | }; | |
3451 | ||
3452 | // V4T Arm -> Thumb long branch stub. Used on V4T where blx is not | |
3453 | // available. | |
3454 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb[] = | |
3455 | { | |
3456 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3457 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3458 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3459 | // dcd R_ARM_ABS32(X) | |
3460 | }; | |
3461 | ||
3462 | // Thumb -> Thumb long branch stub. Used on M-profile architectures. | |
3463 | static const Insn_template elf32_arm_stub_long_branch_thumb_only[] = | |
3464 | { | |
3465 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
3466 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
3467 | Insn_template::thumb16_insn(0x4684), // mov ip, r0 | |
3468 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
3469 | Insn_template::thumb16_insn(0x4760), // bx ip | |
3470 | Insn_template::thumb16_insn(0xbf00), // nop | |
3471 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3472 | // dcd R_ARM_ABS32(X) | |
3473 | }; | |
3474 | ||
3475 | // V4T Thumb -> Thumb long branch stub. Using the stack is not | |
3476 | // allowed. | |
3477 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb[] = | |
3478 | { | |
3479 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3480 | Insn_template::thumb16_insn(0x46c0), // nop | |
3481 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3482 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3483 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3484 | // dcd R_ARM_ABS32(X) | |
3485 | }; | |
3486 | ||
3487 | // V4T Thumb -> ARM long branch stub. Used on V4T where blx is not | |
3488 | // available. | |
3489 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm[] = | |
3490 | { | |
3491 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3492 | Insn_template::thumb16_insn(0x46c0), // nop | |
3493 | Insn_template::arm_insn(0xe51ff004), // ldr pc, [pc, #-4] | |
3494 | Insn_template::data_word(0, elfcpp::R_ARM_ABS32, 0), | |
3495 | // dcd R_ARM_ABS32(X) | |
3496 | }; | |
3497 | ||
3498 | // V4T Thumb -> ARM short branch stub. Shorter variant of the above | |
3499 | // one, when the destination is close enough. | |
3500 | static const Insn_template elf32_arm_stub_short_branch_v4t_thumb_arm[] = | |
3501 | { | |
3502 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3503 | Insn_template::thumb16_insn(0x46c0), // nop | |
3504 | Insn_template::arm_rel_insn(0xea000000, -8), // b (X-8) | |
3505 | }; | |
3506 | ||
3507 | // ARM/Thumb -> ARM long branch stub, PIC. On V5T and above, use | |
3508 | // blx to reach the stub if necessary. | |
3509 | static const Insn_template elf32_arm_stub_long_branch_any_arm_pic[] = | |
3510 | { | |
3511 | Insn_template::arm_insn(0xe59fc000), // ldr r12, [pc] | |
3512 | Insn_template::arm_insn(0xe08ff00c), // add pc, pc, ip | |
3513 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
3514 | // dcd R_ARM_REL32(X-4) | |
3515 | }; | |
3516 | ||
3517 | // ARM/Thumb -> Thumb long branch stub, PIC. On V5T and above, use | |
3518 | // blx to reach the stub if necessary. We can not add into pc; | |
3519 | // it is not guaranteed to mode switch (different in ARMv6 and | |
3520 | // ARMv7). | |
3521 | static const Insn_template elf32_arm_stub_long_branch_any_thumb_pic[] = | |
3522 | { | |
3523 | Insn_template::arm_insn(0xe59fc004), // ldr r12, [pc, #4] | |
3524 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3525 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3526 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3527 | // dcd R_ARM_REL32(X) | |
3528 | }; | |
3529 | ||
3530 | // V4T ARM -> ARM long branch stub, PIC. | |
3531 | static const Insn_template elf32_arm_stub_long_branch_v4t_arm_thumb_pic[] = | |
3532 | { | |
3533 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
3534 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3535 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3536 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3537 | // dcd R_ARM_REL32(X) | |
3538 | }; | |
3539 | ||
3540 | // V4T Thumb -> ARM long branch stub, PIC. | |
3541 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_arm_pic[] = | |
3542 | { | |
3543 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3544 | Insn_template::thumb16_insn(0x46c0), // nop | |
3545 | Insn_template::arm_insn(0xe59fc000), // ldr ip, [pc, #0] | |
3546 | Insn_template::arm_insn(0xe08cf00f), // add pc, ip, pc | |
3547 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, -4), | |
3548 | // dcd R_ARM_REL32(X) | |
3549 | }; | |
3550 | ||
3551 | // Thumb -> Thumb long branch stub, PIC. Used on M-profile | |
3552 | // architectures. | |
3553 | static const Insn_template elf32_arm_stub_long_branch_thumb_only_pic[] = | |
3554 | { | |
3555 | Insn_template::thumb16_insn(0xb401), // push {r0} | |
3556 | Insn_template::thumb16_insn(0x4802), // ldr r0, [pc, #8] | |
3557 | Insn_template::thumb16_insn(0x46fc), // mov ip, pc | |
3558 | Insn_template::thumb16_insn(0x4484), // add ip, r0 | |
3559 | Insn_template::thumb16_insn(0xbc01), // pop {r0} | |
3560 | Insn_template::thumb16_insn(0x4760), // bx ip | |
3561 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 4), | |
3562 | // dcd R_ARM_REL32(X) | |
3563 | }; | |
3564 | ||
3565 | // V4T Thumb -> Thumb long branch stub, PIC. Using the stack is not | |
3566 | // allowed. | |
3567 | static const Insn_template elf32_arm_stub_long_branch_v4t_thumb_thumb_pic[] = | |
3568 | { | |
3569 | Insn_template::thumb16_insn(0x4778), // bx pc | |
3570 | Insn_template::thumb16_insn(0x46c0), // nop | |
3571 | Insn_template::arm_insn(0xe59fc004), // ldr ip, [pc, #4] | |
3572 | Insn_template::arm_insn(0xe08fc00c), // add ip, pc, ip | |
3573 | Insn_template::arm_insn(0xe12fff1c), // bx ip | |
3574 | Insn_template::data_word(0, elfcpp::R_ARM_REL32, 0), | |
3575 | // dcd R_ARM_REL32(X) | |
3576 | }; | |
3577 | ||
3578 | // Cortex-A8 erratum-workaround stubs. | |
3579 | ||
3580 | // Stub used for conditional branches (which may be beyond +/-1MB away, | |
3581 | // so we can't use a conditional branch to reach this stub). | |
3582 | ||
3583 | // original code: | |
3584 | // | |
3585 | // b<cond> X | |
3586 | // after: | |
3587 | // | |
3588 | static const Insn_template elf32_arm_stub_a8_veneer_b_cond[] = | |
3589 | { | |
3590 | Insn_template::thumb16_bcond_insn(0xd001), // b<cond>.n true | |
3591 | Insn_template::thumb32_b_insn(0xf000b800, -4), // b.w after | |
3592 | Insn_template::thumb32_b_insn(0xf000b800, -4) // true: | |
3593 | // b.w X | |
3594 | }; | |
3595 | ||
3596 | // Stub used for b.w and bl.w instructions. | |
3597 | ||
3598 | static const Insn_template elf32_arm_stub_a8_veneer_b[] = | |
3599 | { | |
3600 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
3601 | }; | |
3602 | ||
3603 | static const Insn_template elf32_arm_stub_a8_veneer_bl[] = | |
3604 | { | |
3605 | Insn_template::thumb32_b_insn(0xf000b800, -4) // b.w dest | |
3606 | }; | |
3607 | ||
3608 | // Stub used for Thumb-2 blx.w instructions. We modified the original blx.w | |
3609 | // instruction (which switches to ARM mode) to point to this stub. Jump to | |
3610 | // the real destination using an ARM-mode branch. | |
bb0d3eb0 | 3611 | static const Insn_template elf32_arm_stub_a8_veneer_blx[] = |
b569affa DK |
3612 | { |
3613 | Insn_template::arm_rel_insn(0xea000000, -8) // b dest | |
3614 | }; | |
3615 | ||
3616 | // Fill in the stub template look-up table. Stub templates are constructed | |
3617 | // per instance of Stub_factory for fast look-up without locking | |
3618 | // in a thread-enabled environment. | |
3619 | ||
3620 | this->stub_templates_[arm_stub_none] = | |
3621 | new Stub_template(arm_stub_none, NULL, 0); | |
3622 | ||
3623 | #define DEF_STUB(x) \ | |
3624 | do \ | |
3625 | { \ | |
3626 | size_t array_size \ | |
3627 | = sizeof(elf32_arm_stub_##x) / sizeof(elf32_arm_stub_##x[0]); \ | |
3628 | Stub_type type = arm_stub_##x; \ | |
3629 | this->stub_templates_[type] = \ | |
3630 | new Stub_template(type, elf32_arm_stub_##x, array_size); \ | |
3631 | } \ | |
3632 | while (0); | |
3633 | ||
3634 | DEF_STUBS | |
3635 | #undef DEF_STUB | |
3636 | } | |
3637 | ||
56ee5e00 DK |
3638 | // Stub_table methods. |
3639 | ||
2fb7225c | 3640 | // Removel all Cortex-A8 stub. |
56ee5e00 DK |
3641 | |
3642 | template<bool big_endian> | |
3643 | void | |
2fb7225c DK |
3644 | Stub_table<big_endian>::remove_all_cortex_a8_stubs() |
3645 | { | |
3646 | for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin(); | |
3647 | p != this->cortex_a8_stubs_.end(); | |
3648 | ++p) | |
3649 | delete p->second; | |
3650 | this->cortex_a8_stubs_.clear(); | |
3651 | } | |
3652 | ||
3653 | // Relocate one stub. This is a helper for Stub_table::relocate_stubs(). | |
3654 | ||
3655 | template<bool big_endian> | |
3656 | void | |
3657 | Stub_table<big_endian>::relocate_stub( | |
3658 | Stub* stub, | |
3659 | const Relocate_info<32, big_endian>* relinfo, | |
3660 | Target_arm<big_endian>* arm_target, | |
3661 | Output_section* output_section, | |
3662 | unsigned char* view, | |
3663 | Arm_address address, | |
3664 | section_size_type view_size) | |
56ee5e00 | 3665 | { |
2ea97941 | 3666 | const Stub_template* stub_template = stub->stub_template(); |
2fb7225c DK |
3667 | if (stub_template->reloc_count() != 0) |
3668 | { | |
3669 | // Adjust view to cover the stub only. | |
3670 | section_size_type offset = stub->offset(); | |
3671 | section_size_type stub_size = stub_template->size(); | |
3672 | gold_assert(offset + stub_size <= view_size); | |
3673 | ||
3674 | arm_target->relocate_stub(stub, relinfo, output_section, view + offset, | |
3675 | address + offset, stub_size); | |
3676 | } | |
56ee5e00 DK |
3677 | } |
3678 | ||
2fb7225c DK |
3679 | // Relocate all stubs in this stub table. |
3680 | ||
56ee5e00 DK |
3681 | template<bool big_endian> |
3682 | void | |
3683 | Stub_table<big_endian>::relocate_stubs( | |
3684 | const Relocate_info<32, big_endian>* relinfo, | |
3685 | Target_arm<big_endian>* arm_target, | |
2ea97941 | 3686 | Output_section* output_section, |
56ee5e00 | 3687 | unsigned char* view, |
2ea97941 | 3688 | Arm_address address, |
56ee5e00 DK |
3689 | section_size_type view_size) |
3690 | { | |
3691 | // If we are passed a view bigger than the stub table's. we need to | |
3692 | // adjust the view. | |
2ea97941 | 3693 | gold_assert(address == this->address() |
56ee5e00 DK |
3694 | && (view_size |
3695 | == static_cast<section_size_type>(this->data_size()))); | |
3696 | ||
2fb7225c DK |
3697 | // Relocate all relocation stubs. |
3698 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3699 | p != this->reloc_stubs_.end(); | |
3700 | ++p) | |
3701 | this->relocate_stub(p->second, relinfo, arm_target, output_section, view, | |
3702 | address, view_size); | |
3703 | ||
3704 | // Relocate all Cortex-A8 stubs. | |
3705 | for (Cortex_a8_stub_list::iterator p = this->cortex_a8_stubs_.begin(); | |
3706 | p != this->cortex_a8_stubs_.end(); | |
3707 | ++p) | |
3708 | this->relocate_stub(p->second, relinfo, arm_target, output_section, view, | |
3709 | address, view_size); | |
3710 | } | |
3711 | ||
3712 | // Write out the stubs to file. | |
3713 | ||
3714 | template<bool big_endian> | |
3715 | void | |
3716 | Stub_table<big_endian>::do_write(Output_file* of) | |
3717 | { | |
3718 | off_t offset = this->offset(); | |
3719 | const section_size_type oview_size = | |
3720 | convert_to_section_size_type(this->data_size()); | |
3721 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
3722 | ||
3723 | // Write relocation stubs. | |
56ee5e00 DK |
3724 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); |
3725 | p != this->reloc_stubs_.end(); | |
3726 | ++p) | |
3727 | { | |
3728 | Reloc_stub* stub = p->second; | |
2fb7225c DK |
3729 | Arm_address address = this->address() + stub->offset(); |
3730 | gold_assert(address | |
3731 | == align_address(address, | |
3732 | stub->stub_template()->alignment())); | |
3733 | stub->write(oview + stub->offset(), stub->stub_template()->size(), | |
3734 | big_endian); | |
56ee5e00 | 3735 | } |
2fb7225c DK |
3736 | |
3737 | // Write Cortex-A8 stubs. | |
3738 | for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin(); | |
3739 | p != this->cortex_a8_stubs_.end(); | |
3740 | ++p) | |
3741 | { | |
3742 | Cortex_a8_stub* stub = p->second; | |
3743 | Arm_address address = this->address() + stub->offset(); | |
3744 | gold_assert(address | |
3745 | == align_address(address, | |
3746 | stub->stub_template()->alignment())); | |
3747 | stub->write(oview + stub->offset(), stub->stub_template()->size(), | |
3748 | big_endian); | |
3749 | } | |
3750 | ||
3751 | of->write_output_view(this->offset(), oview_size, oview); | |
56ee5e00 DK |
3752 | } |
3753 | ||
2fb7225c DK |
3754 | // Update the data size and address alignment of the stub table at the end |
3755 | // of a relaxation pass. Return true if either the data size or the | |
3756 | // alignment changed in this relaxation pass. | |
3757 | ||
3758 | template<bool big_endian> | |
3759 | bool | |
3760 | Stub_table<big_endian>::update_data_size_and_addralign() | |
3761 | { | |
3762 | off_t size = 0; | |
3763 | unsigned addralign = 1; | |
3764 | ||
3765 | // Go over all stubs in table to compute data size and address alignment. | |
3766 | ||
3767 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
3768 | p != this->reloc_stubs_.end(); | |
3769 | ++p) | |
3770 | { | |
3771 | const Stub_template* stub_template = p->second->stub_template(); | |
3772 | addralign = std::max(addralign, stub_template->alignment()); | |
3773 | size = (align_address(size, stub_template->alignment()) | |
3774 | + stub_template->size()); | |
3775 | } | |
3776 | ||
3777 | for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin(); | |
3778 | p != this->cortex_a8_stubs_.end(); | |
3779 | ++p) | |
3780 | { | |
3781 | const Stub_template* stub_template = p->second->stub_template(); | |
3782 | addralign = std::max(addralign, stub_template->alignment()); | |
3783 | size = (align_address(size, stub_template->alignment()) | |
3784 | + stub_template->size()); | |
3785 | } | |
3786 | ||
3787 | // Check if either data size or alignment changed in this pass. | |
3788 | // Update prev_data_size_ and prev_addralign_. These will be used | |
3789 | // as the current data size and address alignment for the next pass. | |
3790 | bool changed = size != this->prev_data_size_; | |
3791 | this->prev_data_size_ = size; | |
3792 | ||
3793 | if (addralign != this->prev_addralign_) | |
3794 | changed = true; | |
3795 | this->prev_addralign_ = addralign; | |
3796 | ||
3797 | return changed; | |
3798 | } | |
3799 | ||
3800 | // Finalize the stubs. This sets the offsets of the stubs within the stub | |
3801 | // table. It also marks all input sections needing Cortex-A8 workaround. | |
56ee5e00 DK |
3802 | |
3803 | template<bool big_endian> | |
3804 | void | |
2fb7225c | 3805 | Stub_table<big_endian>::finalize_stubs() |
56ee5e00 DK |
3806 | { |
3807 | off_t off = 0; | |
56ee5e00 DK |
3808 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); |
3809 | p != this->reloc_stubs_.end(); | |
3810 | ++p) | |
3811 | { | |
3812 | Reloc_stub* stub = p->second; | |
2ea97941 ILT |
3813 | const Stub_template* stub_template = stub->stub_template(); |
3814 | uint64_t stub_addralign = stub_template->alignment(); | |
56ee5e00 DK |
3815 | off = align_address(off, stub_addralign); |
3816 | stub->set_offset(off); | |
2ea97941 | 3817 | off += stub_template->size(); |
56ee5e00 DK |
3818 | } |
3819 | ||
2fb7225c DK |
3820 | for (Cortex_a8_stub_list::const_iterator p = this->cortex_a8_stubs_.begin(); |
3821 | p != this->cortex_a8_stubs_.end(); | |
3822 | ++p) | |
3823 | { | |
3824 | Cortex_a8_stub* stub = p->second; | |
3825 | const Stub_template* stub_template = stub->stub_template(); | |
3826 | uint64_t stub_addralign = stub_template->alignment(); | |
3827 | off = align_address(off, stub_addralign); | |
3828 | stub->set_offset(off); | |
3829 | off += stub_template->size(); | |
3830 | ||
3831 | // Mark input section so that we can determine later if a code section | |
3832 | // needs the Cortex-A8 workaround quickly. | |
3833 | Arm_relobj<big_endian>* arm_relobj = | |
3834 | Arm_relobj<big_endian>::as_arm_relobj(stub->relobj()); | |
3835 | arm_relobj->mark_section_for_cortex_a8_workaround(stub->shndx()); | |
3836 | } | |
3837 | ||
3838 | gold_assert(off <= this->prev_data_size_); | |
56ee5e00 DK |
3839 | } |
3840 | ||
2fb7225c DK |
3841 | // Apply Cortex-A8 workaround to an address range between VIEW_ADDRESS |
3842 | // and VIEW_ADDRESS + VIEW_SIZE - 1. VIEW points to the mapped address | |
3843 | // of the address range seen by the linker. | |
56ee5e00 DK |
3844 | |
3845 | template<bool big_endian> | |
3846 | void | |
2fb7225c DK |
3847 | Stub_table<big_endian>::apply_cortex_a8_workaround_to_address_range( |
3848 | Target_arm<big_endian>* arm_target, | |
3849 | unsigned char* view, | |
3850 | Arm_address view_address, | |
3851 | section_size_type view_size) | |
56ee5e00 | 3852 | { |
2fb7225c DK |
3853 | // Cortex-A8 stubs are sorted by addresses of branches being fixed up. |
3854 | for (Cortex_a8_stub_list::const_iterator p = | |
3855 | this->cortex_a8_stubs_.lower_bound(view_address); | |
3856 | ((p != this->cortex_a8_stubs_.end()) | |
3857 | && (p->first < (view_address + view_size))); | |
3858 | ++p) | |
56ee5e00 | 3859 | { |
2fb7225c DK |
3860 | // We do not store the THUMB bit in the LSB of either the branch address |
3861 | // or the stub offset. There is no need to strip the LSB. | |
3862 | Arm_address branch_address = p->first; | |
3863 | const Cortex_a8_stub* stub = p->second; | |
3864 | Arm_address stub_address = this->address() + stub->offset(); | |
3865 | ||
3866 | // Offset of the branch instruction relative to this view. | |
3867 | section_size_type offset = | |
3868 | convert_to_section_size_type(branch_address - view_address); | |
3869 | gold_assert((offset + 4) <= view_size); | |
3870 | ||
3871 | arm_target->apply_cortex_a8_workaround(stub, stub_address, | |
3872 | view + offset, branch_address); | |
3873 | } | |
56ee5e00 DK |
3874 | } |
3875 | ||
10ad9fe5 DK |
3876 | // Arm_input_section methods. |
3877 | ||
3878 | // Initialize an Arm_input_section. | |
3879 | ||
3880 | template<bool big_endian> | |
3881 | void | |
3882 | Arm_input_section<big_endian>::init() | |
3883 | { | |
2ea97941 ILT |
3884 | Relobj* relobj = this->relobj(); |
3885 | unsigned int shndx = this->shndx(); | |
10ad9fe5 DK |
3886 | |
3887 | // Cache these to speed up size and alignment queries. It is too slow | |
3888 | // to call section_addraglin and section_size every time. | |
2ea97941 ILT |
3889 | this->original_addralign_ = relobj->section_addralign(shndx); |
3890 | this->original_size_ = relobj->section_size(shndx); | |
10ad9fe5 DK |
3891 | |
3892 | // We want to make this look like the original input section after | |
3893 | // output sections are finalized. | |
2ea97941 ILT |
3894 | Output_section* os = relobj->output_section(shndx); |
3895 | off_t offset = relobj->output_section_offset(shndx); | |
3896 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); | |
3897 | this->set_address(os->address() + offset); | |
3898 | this->set_file_offset(os->offset() + offset); | |
10ad9fe5 DK |
3899 | |
3900 | this->set_current_data_size(this->original_size_); | |
3901 | this->finalize_data_size(); | |
3902 | } | |
3903 | ||
3904 | template<bool big_endian> | |
3905 | void | |
3906 | Arm_input_section<big_endian>::do_write(Output_file* of) | |
3907 | { | |
3908 | // We have to write out the original section content. | |
3909 | section_size_type section_size; | |
3910 | const unsigned char* section_contents = | |
3911 | this->relobj()->section_contents(this->shndx(), §ion_size, false); | |
3912 | of->write(this->offset(), section_contents, section_size); | |
3913 | ||
3914 | // If this owns a stub table and it is not empty, write it. | |
3915 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) | |
3916 | this->stub_table_->write(of); | |
3917 | } | |
3918 | ||
3919 | // Finalize data size. | |
3920 | ||
3921 | template<bool big_endian> | |
3922 | void | |
3923 | Arm_input_section<big_endian>::set_final_data_size() | |
3924 | { | |
3925 | // If this owns a stub table, finalize its data size as well. | |
3926 | if (this->is_stub_table_owner()) | |
3927 | { | |
2ea97941 | 3928 | uint64_t address = this->address(); |
10ad9fe5 DK |
3929 | |
3930 | // The stub table comes after the original section contents. | |
2ea97941 ILT |
3931 | address += this->original_size_; |
3932 | address = align_address(address, this->stub_table_->addralign()); | |
3933 | off_t offset = this->offset() + (address - this->address()); | |
3934 | this->stub_table_->set_address_and_file_offset(address, offset); | |
3935 | address += this->stub_table_->data_size(); | |
3936 | gold_assert(address == this->address() + this->current_data_size()); | |
10ad9fe5 DK |
3937 | } |
3938 | ||
3939 | this->set_data_size(this->current_data_size()); | |
3940 | } | |
3941 | ||
3942 | // Reset address and file offset. | |
3943 | ||
3944 | template<bool big_endian> | |
3945 | void | |
3946 | Arm_input_section<big_endian>::do_reset_address_and_file_offset() | |
3947 | { | |
3948 | // Size of the original input section contents. | |
3949 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
3950 | ||
3951 | // If this is a stub table owner, account for the stub table size. | |
3952 | if (this->is_stub_table_owner()) | |
3953 | { | |
2ea97941 | 3954 | Stub_table<big_endian>* stub_table = this->stub_table_; |
10ad9fe5 DK |
3955 | |
3956 | // Reset the stub table's address and file offset. The | |
3957 | // current data size for child will be updated after that. | |
3958 | stub_table_->reset_address_and_file_offset(); | |
3959 | off = align_address(off, stub_table_->addralign()); | |
2ea97941 | 3960 | off += stub_table->current_data_size(); |
10ad9fe5 DK |
3961 | } |
3962 | ||
3963 | this->set_current_data_size(off); | |
3964 | } | |
3965 | ||
07f508a2 DK |
3966 | // Arm_output_section methods. |
3967 | ||
3968 | // Create a stub group for input sections from BEGIN to END. OWNER | |
3969 | // points to the input section to be the owner a new stub table. | |
3970 | ||
3971 | template<bool big_endian> | |
3972 | void | |
3973 | Arm_output_section<big_endian>::create_stub_group( | |
3974 | Input_section_list::const_iterator begin, | |
3975 | Input_section_list::const_iterator end, | |
3976 | Input_section_list::const_iterator owner, | |
3977 | Target_arm<big_endian>* target, | |
3978 | std::vector<Output_relaxed_input_section*>* new_relaxed_sections) | |
3979 | { | |
3980 | // Currently we convert ordinary input sections into relaxed sections only | |
3981 | // at this point but we may want to support creating relaxed input section | |
3982 | // very early. So we check here to see if owner is already a relaxed | |
3983 | // section. | |
3984 | ||
3985 | Arm_input_section<big_endian>* arm_input_section; | |
3986 | if (owner->is_relaxed_input_section()) | |
3987 | { | |
3988 | arm_input_section = | |
3989 | Arm_input_section<big_endian>::as_arm_input_section( | |
3990 | owner->relaxed_input_section()); | |
3991 | } | |
3992 | else | |
3993 | { | |
3994 | gold_assert(owner->is_input_section()); | |
3995 | // Create a new relaxed input section. | |
3996 | arm_input_section = | |
3997 | target->new_arm_input_section(owner->relobj(), owner->shndx()); | |
3998 | new_relaxed_sections->push_back(arm_input_section); | |
3999 | } | |
4000 | ||
4001 | // Create a stub table. | |
2ea97941 | 4002 | Stub_table<big_endian>* stub_table = |
07f508a2 DK |
4003 | target->new_stub_table(arm_input_section); |
4004 | ||
2ea97941 | 4005 | arm_input_section->set_stub_table(stub_table); |
07f508a2 DK |
4006 | |
4007 | Input_section_list::const_iterator p = begin; | |
4008 | Input_section_list::const_iterator prev_p; | |
4009 | ||
4010 | // Look for input sections or relaxed input sections in [begin ... end]. | |
4011 | do | |
4012 | { | |
4013 | if (p->is_input_section() || p->is_relaxed_input_section()) | |
4014 | { | |
4015 | // The stub table information for input sections live | |
4016 | // in their objects. | |
4017 | Arm_relobj<big_endian>* arm_relobj = | |
4018 | Arm_relobj<big_endian>::as_arm_relobj(p->relobj()); | |
2ea97941 | 4019 | arm_relobj->set_stub_table(p->shndx(), stub_table); |
07f508a2 DK |
4020 | } |
4021 | prev_p = p++; | |
4022 | } | |
4023 | while (prev_p != end); | |
4024 | } | |
4025 | ||
4026 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit | |
4027 | // of stub groups. We grow a stub group by adding input section until the | |
4028 | // size is just below GROUP_SIZE. The last input section will be converted | |
4029 | // into a stub table. If STUB_ALWAYS_AFTER_BRANCH is false, we also add | |
4030 | // input section after the stub table, effectively double the group size. | |
4031 | // | |
4032 | // This is similar to the group_sections() function in elf32-arm.c but is | |
4033 | // implemented differently. | |
4034 | ||
4035 | template<bool big_endian> | |
4036 | void | |
4037 | Arm_output_section<big_endian>::group_sections( | |
4038 | section_size_type group_size, | |
4039 | bool stubs_always_after_branch, | |
4040 | Target_arm<big_endian>* target) | |
4041 | { | |
4042 | // We only care about sections containing code. | |
4043 | if ((this->flags() & elfcpp::SHF_EXECINSTR) == 0) | |
4044 | return; | |
4045 | ||
4046 | // States for grouping. | |
4047 | typedef enum | |
4048 | { | |
4049 | // No group is being built. | |
4050 | NO_GROUP, | |
4051 | // A group is being built but the stub table is not found yet. | |
4052 | // We keep group a stub group until the size is just under GROUP_SIZE. | |
4053 | // The last input section in the group will be used as the stub table. | |
4054 | FINDING_STUB_SECTION, | |
4055 | // A group is being built and we have already found a stub table. | |
4056 | // We enter this state to grow a stub group by adding input section | |
4057 | // after the stub table. This effectively doubles the group size. | |
4058 | HAS_STUB_SECTION | |
4059 | } State; | |
4060 | ||
4061 | // Any newly created relaxed sections are stored here. | |
4062 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; | |
4063 | ||
4064 | State state = NO_GROUP; | |
4065 | section_size_type off = 0; | |
4066 | section_size_type group_begin_offset = 0; | |
4067 | section_size_type group_end_offset = 0; | |
4068 | section_size_type stub_table_end_offset = 0; | |
4069 | Input_section_list::const_iterator group_begin = | |
4070 | this->input_sections().end(); | |
2ea97941 | 4071 | Input_section_list::const_iterator stub_table = |
07f508a2 DK |
4072 | this->input_sections().end(); |
4073 | Input_section_list::const_iterator group_end = this->input_sections().end(); | |
4074 | for (Input_section_list::const_iterator p = this->input_sections().begin(); | |
4075 | p != this->input_sections().end(); | |
4076 | ++p) | |
4077 | { | |
4078 | section_size_type section_begin_offset = | |
4079 | align_address(off, p->addralign()); | |
4080 | section_size_type section_end_offset = | |
4081 | section_begin_offset + p->data_size(); | |
4082 | ||
4083 | // Check to see if we should group the previously seens sections. | |
e9bbb538 | 4084 | switch (state) |
07f508a2 DK |
4085 | { |
4086 | case NO_GROUP: | |
4087 | break; | |
4088 | ||
4089 | case FINDING_STUB_SECTION: | |
4090 | // Adding this section makes the group larger than GROUP_SIZE. | |
4091 | if (section_end_offset - group_begin_offset >= group_size) | |
4092 | { | |
4093 | if (stubs_always_after_branch) | |
4094 | { | |
4095 | gold_assert(group_end != this->input_sections().end()); | |
4096 | this->create_stub_group(group_begin, group_end, group_end, | |
4097 | target, &new_relaxed_sections); | |
4098 | state = NO_GROUP; | |
4099 | } | |
4100 | else | |
4101 | { | |
4102 | // But wait, there's more! Input sections up to | |
4103 | // stub_group_size bytes after the stub table can be | |
4104 | // handled by it too. | |
4105 | state = HAS_STUB_SECTION; | |
2ea97941 | 4106 | stub_table = group_end; |
07f508a2 DK |
4107 | stub_table_end_offset = group_end_offset; |
4108 | } | |
4109 | } | |
4110 | break; | |
4111 | ||
4112 | case HAS_STUB_SECTION: | |
4113 | // Adding this section makes the post stub-section group larger | |
4114 | // than GROUP_SIZE. | |
4115 | if (section_end_offset - stub_table_end_offset >= group_size) | |
4116 | { | |
4117 | gold_assert(group_end != this->input_sections().end()); | |
2ea97941 | 4118 | this->create_stub_group(group_begin, group_end, stub_table, |
07f508a2 DK |
4119 | target, &new_relaxed_sections); |
4120 | state = NO_GROUP; | |
4121 | } | |
4122 | break; | |
4123 | ||
4124 | default: | |
4125 | gold_unreachable(); | |
4126 | } | |
4127 | ||
4128 | // If we see an input section and currently there is no group, start | |
4129 | // a new one. Skip any empty sections. | |
4130 | if ((p->is_input_section() || p->is_relaxed_input_section()) | |
4131 | && (p->relobj()->section_size(p->shndx()) != 0)) | |
4132 | { | |
4133 | if (state == NO_GROUP) | |
4134 | { | |
4135 | state = FINDING_STUB_SECTION; | |
4136 | group_begin = p; | |
4137 | group_begin_offset = section_begin_offset; | |
4138 | } | |
4139 | ||
4140 | // Keep track of the last input section seen. | |
4141 | group_end = p; | |
4142 | group_end_offset = section_end_offset; | |
4143 | } | |
4144 | ||
4145 | off = section_end_offset; | |
4146 | } | |
4147 | ||
4148 | // Create a stub group for any ungrouped sections. | |
4149 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) | |
4150 | { | |
4151 | gold_assert(group_end != this->input_sections().end()); | |
4152 | this->create_stub_group(group_begin, group_end, | |
4153 | (state == FINDING_STUB_SECTION | |
4154 | ? group_end | |
2ea97941 | 4155 | : stub_table), |
07f508a2 DK |
4156 | target, &new_relaxed_sections); |
4157 | } | |
4158 | ||
4159 | // Convert input section into relaxed input section in a batch. | |
4160 | if (!new_relaxed_sections.empty()) | |
4161 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); | |
4162 | ||
4163 | // Update the section offsets | |
4164 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) | |
4165 | { | |
4166 | Arm_relobj<big_endian>* arm_relobj = | |
4167 | Arm_relobj<big_endian>::as_arm_relobj( | |
4168 | new_relaxed_sections[i]->relobj()); | |
2ea97941 | 4169 | unsigned int shndx = new_relaxed_sections[i]->shndx(); |
07f508a2 | 4170 | // Tell Arm_relobj that this input section is converted. |
2ea97941 | 4171 | arm_relobj->convert_input_section_to_relaxed_section(shndx); |
07f508a2 DK |
4172 | } |
4173 | } | |
4174 | ||
8ffa3667 DK |
4175 | // Arm_relobj methods. |
4176 | ||
44272192 DK |
4177 | // Determine if we want to scan the SHNDX-th section for relocation stubs. |
4178 | // This is a helper for Arm_relobj::scan_sections_for_stubs() below. | |
4179 | ||
4180 | template<bool big_endian> | |
4181 | bool | |
4182 | Arm_relobj<big_endian>::section_needs_reloc_stub_scanning( | |
4183 | const elfcpp::Shdr<32, big_endian>& shdr, | |
4184 | const Relobj::Output_sections& out_sections, | |
4185 | const Symbol_table *symtab) | |
4186 | { | |
4187 | unsigned int sh_type = shdr.get_sh_type(); | |
4188 | if (sh_type != elfcpp::SHT_REL && sh_type != elfcpp::SHT_RELA) | |
4189 | return false; | |
4190 | ||
4191 | // Ignore empty section. | |
4192 | off_t sh_size = shdr.get_sh_size(); | |
4193 | if (sh_size == 0) | |
4194 | return false; | |
4195 | ||
4196 | // Ignore reloc section with bad info. This error will be | |
4197 | // reported in the final link. | |
4198 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); | |
4199 | if (index >= this->shnum()) | |
4200 | return false; | |
4201 | ||
4202 | // This relocation section is against a section which we | |
4203 | // discarded or if the section is folded into another | |
4204 | // section due to ICF. | |
4205 | if (out_sections[index] == NULL || symtab->is_section_folded(this, index)) | |
4206 | return false; | |
4207 | ||
4208 | // Ignore reloc section with unexpected symbol table. The | |
4209 | // error will be reported in the final link. | |
4210 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) | |
4211 | return false; | |
4212 | ||
b521dfe4 DK |
4213 | unsigned int reloc_size; |
4214 | if (sh_type == elfcpp::SHT_REL) | |
4215 | reloc_size = elfcpp::Elf_sizes<32>::rel_size; | |
4216 | else | |
4217 | reloc_size = elfcpp::Elf_sizes<32>::rela_size; | |
44272192 DK |
4218 | |
4219 | // Ignore reloc section with unexpected entsize or uneven size. | |
4220 | // The error will be reported in the final link. | |
4221 | if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0) | |
4222 | return false; | |
4223 | ||
4224 | return true; | |
4225 | } | |
4226 | ||
4227 | // Determine if we want to scan the SHNDX-th section for non-relocation stubs. | |
4228 | // This is a helper for Arm_relobj::scan_sections_for_stubs() below. | |
4229 | ||
4230 | template<bool big_endian> | |
4231 | bool | |
4232 | Arm_relobj<big_endian>::section_needs_cortex_a8_stub_scanning( | |
4233 | const elfcpp::Shdr<32, big_endian>& shdr, | |
4234 | unsigned int shndx, | |
4235 | Output_section* os, | |
4236 | const Symbol_table* symtab) | |
4237 | { | |
4238 | // We only scan non-empty code sections. | |
4239 | if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) == 0 | |
4240 | || shdr.get_sh_size() == 0) | |
4241 | return false; | |
4242 | ||
4243 | // Ignore discarded or ICF'ed sections. | |
4244 | if (os == NULL || symtab->is_section_folded(this, shndx)) | |
4245 | return false; | |
4246 | ||
4247 | // Find output address of section. | |
4248 | Arm_address address = os->output_address(this, shndx, 0); | |
4249 | ||
4250 | // If the section does not cross any 4K-boundaries, it does not need to | |
4251 | // be scanned. | |
4252 | if ((address & ~0xfffU) == ((address + shdr.get_sh_size() - 1) & ~0xfffU)) | |
4253 | return false; | |
4254 | ||
4255 | return true; | |
4256 | } | |
4257 | ||
4258 | // Scan a section for Cortex-A8 workaround. | |
4259 | ||
4260 | template<bool big_endian> | |
4261 | void | |
4262 | Arm_relobj<big_endian>::scan_section_for_cortex_a8_erratum( | |
4263 | const elfcpp::Shdr<32, big_endian>& shdr, | |
4264 | unsigned int shndx, | |
4265 | Output_section* os, | |
4266 | Target_arm<big_endian>* arm_target) | |
4267 | { | |
4268 | Arm_address output_address = os->output_address(this, shndx, 0); | |
4269 | ||
4270 | // Get the section contents. | |
4271 | section_size_type input_view_size = 0; | |
4272 | const unsigned char* input_view = | |
4273 | this->section_contents(shndx, &input_view_size, false); | |
4274 | ||
4275 | // We need to go through the mapping symbols to determine what to | |
4276 | // scan. There are two reasons. First, we should look at THUMB code and | |
4277 | // THUMB code only. Second, we only want to look at the 4K-page boundary | |
4278 | // to speed up the scanning. | |
4279 | ||
4280 | // Look for the first mapping symbol in this section. It should be | |
4281 | // at (shndx, 0). | |
4282 | Mapping_symbol_position section_start(shndx, 0); | |
4283 | typename Mapping_symbols_info::const_iterator p = | |
4284 | this->mapping_symbols_info_.lower_bound(section_start); | |
4285 | ||
4286 | if (p == this->mapping_symbols_info_.end() | |
4287 | || p->first != section_start) | |
4288 | { | |
4289 | gold_warning(_("Cortex-A8 erratum scanning failed because there " | |
4290 | "is no mapping symbols for section %u of %s"), | |
4291 | shndx, this->name().c_str()); | |
4292 | return; | |
4293 | } | |
4294 | ||
4295 | while (p != this->mapping_symbols_info_.end() | |
4296 | && p->first.first == shndx) | |
4297 | { | |
4298 | typename Mapping_symbols_info::const_iterator next = | |
4299 | this->mapping_symbols_info_.upper_bound(p->first); | |
4300 | ||
4301 | // Only scan part of a section with THUMB code. | |
4302 | if (p->second == 't') | |
4303 | { | |
4304 | // Determine the end of this range. | |
4305 | section_size_type span_start = | |
4306 | convert_to_section_size_type(p->first.second); | |
4307 | section_size_type span_end; | |
4308 | if (next != this->mapping_symbols_info_.end() | |
4309 | && next->first.first == shndx) | |
4310 | span_end = convert_to_section_size_type(next->first.second); | |
4311 | else | |
4312 | span_end = convert_to_section_size_type(shdr.get_sh_size()); | |
4313 | ||
4314 | if (((span_start + output_address) & ~0xfffUL) | |
4315 | != ((span_end + output_address - 1) & ~0xfffUL)) | |
4316 | { | |
4317 | arm_target->scan_span_for_cortex_a8_erratum(this, shndx, | |
4318 | span_start, span_end, | |
4319 | input_view, | |
4320 | output_address); | |
4321 | } | |
4322 | } | |
4323 | ||
4324 | p = next; | |
4325 | } | |
4326 | } | |
4327 | ||
8ffa3667 DK |
4328 | // Scan relocations for stub generation. |
4329 | ||
4330 | template<bool big_endian> | |
4331 | void | |
4332 | Arm_relobj<big_endian>::scan_sections_for_stubs( | |
4333 | Target_arm<big_endian>* arm_target, | |
4334 | const Symbol_table* symtab, | |
2ea97941 | 4335 | const Layout* layout) |
8ffa3667 | 4336 | { |
2ea97941 ILT |
4337 | unsigned int shnum = this->shnum(); |
4338 | const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
8ffa3667 DK |
4339 | |
4340 | // Read the section headers. | |
4341 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
2ea97941 | 4342 | shnum * shdr_size, |
8ffa3667 DK |
4343 | true, true); |
4344 | ||
4345 | // To speed up processing, we set up hash tables for fast lookup of | |
4346 | // input offsets to output addresses. | |
4347 | this->initialize_input_to_output_maps(); | |
4348 | ||
4349 | const Relobj::Output_sections& out_sections(this->output_sections()); | |
4350 | ||
4351 | Relocate_info<32, big_endian> relinfo; | |
8ffa3667 | 4352 | relinfo.symtab = symtab; |
2ea97941 | 4353 | relinfo.layout = layout; |
8ffa3667 DK |
4354 | relinfo.object = this; |
4355 | ||
44272192 | 4356 | // Do relocation stubs scanning. |
2ea97941 ILT |
4357 | const unsigned char* p = pshdrs + shdr_size; |
4358 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
8ffa3667 | 4359 | { |
44272192 DK |
4360 | const elfcpp::Shdr<32, big_endian> shdr(p); |
4361 | if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab)) | |
8ffa3667 | 4362 | { |
44272192 DK |
4363 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); |
4364 | Arm_address output_offset = this->get_output_section_offset(index); | |
4365 | Arm_address output_address; | |
4366 | if(output_offset != invalid_address) | |
4367 | output_address = out_sections[index]->address() + output_offset; | |
4368 | else | |
4369 | { | |
4370 | // Currently this only happens for a relaxed section. | |
4371 | const Output_relaxed_input_section* poris = | |
4372 | out_sections[index]->find_relaxed_input_section(this, index); | |
4373 | gold_assert(poris != NULL); | |
4374 | output_address = poris->address(); | |
4375 | } | |
8ffa3667 | 4376 | |
44272192 DK |
4377 | // Get the relocations. |
4378 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), | |
4379 | shdr.get_sh_size(), | |
4380 | true, false); | |
4381 | ||
4382 | // Get the section contents. This does work for the case in which | |
4383 | // we modify the contents of an input section. We need to pass the | |
4384 | // output view under such circumstances. | |
4385 | section_size_type input_view_size = 0; | |
4386 | const unsigned char* input_view = | |
4387 | this->section_contents(index, &input_view_size, false); | |
4388 | ||
4389 | relinfo.reloc_shndx = i; | |
4390 | relinfo.data_shndx = index; | |
4391 | unsigned int sh_type = shdr.get_sh_type(); | |
b521dfe4 DK |
4392 | unsigned int reloc_size; |
4393 | if (sh_type == elfcpp::SHT_REL) | |
4394 | reloc_size = elfcpp::Elf_sizes<32>::rel_size; | |
4395 | else | |
4396 | reloc_size = elfcpp::Elf_sizes<32>::rela_size; | |
44272192 DK |
4397 | |
4398 | Output_section* os = out_sections[index]; | |
4399 | arm_target->scan_section_for_stubs(&relinfo, sh_type, prelocs, | |
4400 | shdr.get_sh_size() / reloc_size, | |
4401 | os, | |
4402 | output_offset == invalid_address, | |
4403 | input_view, output_address, | |
4404 | input_view_size); | |
8ffa3667 | 4405 | } |
44272192 | 4406 | } |
8ffa3667 | 4407 | |
44272192 DK |
4408 | // Do Cortex-A8 erratum stubs scanning. This has to be done for a section |
4409 | // after its relocation section, if there is one, is processed for | |
4410 | // relocation stubs. Merging this loop with the one above would have been | |
4411 | // complicated since we would have had to make sure that relocation stub | |
4412 | // scanning is done first. | |
4413 | if (arm_target->fix_cortex_a8()) | |
4414 | { | |
4415 | const unsigned char* p = pshdrs + shdr_size; | |
4416 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
8ffa3667 | 4417 | { |
44272192 DK |
4418 | const elfcpp::Shdr<32, big_endian> shdr(p); |
4419 | if (this->section_needs_cortex_a8_stub_scanning(shdr, i, | |
4420 | out_sections[i], | |
4421 | symtab)) | |
4422 | this->scan_section_for_cortex_a8_erratum(shdr, i, out_sections[i], | |
4423 | arm_target); | |
8ffa3667 | 4424 | } |
8ffa3667 DK |
4425 | } |
4426 | ||
4427 | // After we've done the relocations, we release the hash tables, | |
4428 | // since we no longer need them. | |
4429 | this->free_input_to_output_maps(); | |
4430 | } | |
4431 | ||
4432 | // Count the local symbols. The ARM backend needs to know if a symbol | |
4433 | // is a THUMB function or not. For global symbols, it is easy because | |
4434 | // the Symbol object keeps the ELF symbol type. For local symbol it is | |
4435 | // harder because we cannot access this information. So we override the | |
4436 | // do_count_local_symbol in parent and scan local symbols to mark | |
4437 | // THUMB functions. This is not the most efficient way but I do not want to | |
4438 | // slow down other ports by calling a per symbol targer hook inside | |
4439 | // Sized_relobj<size, big_endian>::do_count_local_symbols. | |
4440 | ||
4441 | template<bool big_endian> | |
4442 | void | |
4443 | Arm_relobj<big_endian>::do_count_local_symbols( | |
4444 | Stringpool_template<char>* pool, | |
4445 | Stringpool_template<char>* dynpool) | |
4446 | { | |
4447 | // We need to fix-up the values of any local symbols whose type are | |
4448 | // STT_ARM_TFUNC. | |
4449 | ||
4450 | // Ask parent to count the local symbols. | |
4451 | Sized_relobj<32, big_endian>::do_count_local_symbols(pool, dynpool); | |
4452 | const unsigned int loccount = this->local_symbol_count(); | |
4453 | if (loccount == 0) | |
4454 | return; | |
4455 | ||
4456 | // Intialize the thumb function bit-vector. | |
4457 | std::vector<bool> empty_vector(loccount, false); | |
4458 | this->local_symbol_is_thumb_function_.swap(empty_vector); | |
4459 | ||
4460 | // Read the symbol table section header. | |
2ea97941 | 4461 | const unsigned int symtab_shndx = this->symtab_shndx(); |
8ffa3667 | 4462 | elfcpp::Shdr<32, big_endian> |
2ea97941 | 4463 | symtabshdr(this, this->elf_file()->section_header(symtab_shndx)); |
8ffa3667 DK |
4464 | gold_assert(symtabshdr.get_sh_type() == elfcpp::SHT_SYMTAB); |
4465 | ||
4466 | // Read the local symbols. | |
2ea97941 | 4467 | const int sym_size =elfcpp::Elf_sizes<32>::sym_size; |
8ffa3667 | 4468 | gold_assert(loccount == symtabshdr.get_sh_info()); |
2ea97941 | 4469 | off_t locsize = loccount * sym_size; |
8ffa3667 DK |
4470 | const unsigned char* psyms = this->get_view(symtabshdr.get_sh_offset(), |
4471 | locsize, true, true); | |
4472 | ||
20138696 DK |
4473 | // For mapping symbol processing, we need to read the symbol names. |
4474 | unsigned int strtab_shndx = this->adjust_shndx(symtabshdr.get_sh_link()); | |
4475 | if (strtab_shndx >= this->shnum()) | |
4476 | { | |
4477 | this->error(_("invalid symbol table name index: %u"), strtab_shndx); | |
4478 | return; | |
4479 | } | |
4480 | ||
4481 | elfcpp::Shdr<32, big_endian> | |
4482 | strtabshdr(this, this->elf_file()->section_header(strtab_shndx)); | |
4483 | if (strtabshdr.get_sh_type() != elfcpp::SHT_STRTAB) | |
4484 | { | |
4485 | this->error(_("symbol table name section has wrong type: %u"), | |
4486 | static_cast<unsigned int>(strtabshdr.get_sh_type())); | |
4487 | return; | |
4488 | } | |
4489 | const char* pnames = | |
4490 | reinterpret_cast<const char*>(this->get_view(strtabshdr.get_sh_offset(), | |
4491 | strtabshdr.get_sh_size(), | |
4492 | false, false)); | |
4493 | ||
8ffa3667 DK |
4494 | // Loop over the local symbols and mark any local symbols pointing |
4495 | // to THUMB functions. | |
4496 | ||
4497 | // Skip the first dummy symbol. | |
2ea97941 | 4498 | psyms += sym_size; |
8ffa3667 DK |
4499 | typename Sized_relobj<32, big_endian>::Local_values* plocal_values = |
4500 | this->local_values(); | |
2ea97941 | 4501 | for (unsigned int i = 1; i < loccount; ++i, psyms += sym_size) |
8ffa3667 DK |
4502 | { |
4503 | elfcpp::Sym<32, big_endian> sym(psyms); | |
4504 | elfcpp::STT st_type = sym.get_st_type(); | |
4505 | Symbol_value<32>& lv((*plocal_values)[i]); | |
4506 | Arm_address input_value = lv.input_value(); | |
4507 | ||
20138696 DK |
4508 | // Check to see if this is a mapping symbol. |
4509 | const char* sym_name = pnames + sym.get_st_name(); | |
4510 | if (Target_arm<big_endian>::is_mapping_symbol_name(sym_name)) | |
4511 | { | |
4512 | unsigned int input_shndx = sym.get_st_shndx(); | |
4513 | ||
4514 | // Strip of LSB in case this is a THUMB symbol. | |
4515 | Mapping_symbol_position msp(input_shndx, input_value & ~1U); | |
4516 | this->mapping_symbols_info_[msp] = sym_name[1]; | |
4517 | } | |
4518 | ||
8ffa3667 DK |
4519 | if (st_type == elfcpp::STT_ARM_TFUNC |
4520 | || (st_type == elfcpp::STT_FUNC && ((input_value & 1) != 0))) | |
4521 | { | |
4522 | // This is a THUMB function. Mark this and canonicalize the | |
4523 | // symbol value by setting LSB. | |
4524 | this->local_symbol_is_thumb_function_[i] = true; | |
4525 | if ((input_value & 1) == 0) | |
4526 | lv.set_input_value(input_value | 1); | |
4527 | } | |
4528 | } | |
4529 | } | |
4530 | ||
4531 | // Relocate sections. | |
4532 | template<bool big_endian> | |
4533 | void | |
4534 | Arm_relobj<big_endian>::do_relocate_sections( | |
8ffa3667 | 4535 | const Symbol_table* symtab, |
2ea97941 | 4536 | const Layout* layout, |
8ffa3667 DK |
4537 | const unsigned char* pshdrs, |
4538 | typename Sized_relobj<32, big_endian>::Views* pviews) | |
4539 | { | |
4540 | // Call parent to relocate sections. | |
2ea97941 | 4541 | Sized_relobj<32, big_endian>::do_relocate_sections(symtab, layout, pshdrs, |
43d12afe | 4542 | pviews); |
8ffa3667 DK |
4543 | |
4544 | // We do not generate stubs if doing a relocatable link. | |
4545 | if (parameters->options().relocatable()) | |
4546 | return; | |
4547 | ||
4548 | // Relocate stub tables. | |
2ea97941 | 4549 | unsigned int shnum = this->shnum(); |
8ffa3667 DK |
4550 | |
4551 | Target_arm<big_endian>* arm_target = | |
4552 | Target_arm<big_endian>::default_target(); | |
4553 | ||
4554 | Relocate_info<32, big_endian> relinfo; | |
8ffa3667 | 4555 | relinfo.symtab = symtab; |
2ea97941 | 4556 | relinfo.layout = layout; |
8ffa3667 DK |
4557 | relinfo.object = this; |
4558 | ||
2ea97941 | 4559 | for (unsigned int i = 1; i < shnum; ++i) |
8ffa3667 DK |
4560 | { |
4561 | Arm_input_section<big_endian>* arm_input_section = | |
4562 | arm_target->find_arm_input_section(this, i); | |
4563 | ||
41263c05 DK |
4564 | if (arm_input_section != NULL |
4565 | && arm_input_section->is_stub_table_owner() | |
4566 | && !arm_input_section->stub_table()->empty()) | |
4567 | { | |
4568 | // We cannot discard a section if it owns a stub table. | |
4569 | Output_section* os = this->output_section(i); | |
4570 | gold_assert(os != NULL); | |
4571 | ||
4572 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; | |
4573 | relinfo.reloc_shdr = NULL; | |
4574 | relinfo.data_shndx = i; | |
4575 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<32>::shdr_size; | |
4576 | ||
4577 | gold_assert((*pviews)[i].view != NULL); | |
4578 | ||
4579 | // We are passed the output section view. Adjust it to cover the | |
4580 | // stub table only. | |
4581 | Stub_table<big_endian>* stub_table = arm_input_section->stub_table(); | |
4582 | gold_assert((stub_table->address() >= (*pviews)[i].address) | |
4583 | && ((stub_table->address() + stub_table->data_size()) | |
4584 | <= (*pviews)[i].address + (*pviews)[i].view_size)); | |
4585 | ||
4586 | off_t offset = stub_table->address() - (*pviews)[i].address; | |
4587 | unsigned char* view = (*pviews)[i].view + offset; | |
4588 | Arm_address address = stub_table->address(); | |
4589 | section_size_type view_size = stub_table->data_size(); | |
8ffa3667 | 4590 | |
41263c05 DK |
4591 | stub_table->relocate_stubs(&relinfo, arm_target, os, view, address, |
4592 | view_size); | |
4593 | } | |
4594 | ||
4595 | // Apply Cortex A8 workaround if applicable. | |
4596 | if (this->section_has_cortex_a8_workaround(i)) | |
4597 | { | |
4598 | unsigned char* view = (*pviews)[i].view; | |
4599 | Arm_address view_address = (*pviews)[i].address; | |
4600 | section_size_type view_size = (*pviews)[i].view_size; | |
4601 | Stub_table<big_endian>* stub_table = this->stub_tables_[i]; | |
4602 | ||
4603 | // Adjust view to cover section. | |
4604 | Output_section* os = this->output_section(i); | |
4605 | gold_assert(os != NULL); | |
4606 | Arm_address section_address = os->output_address(this, i, 0); | |
4607 | uint64_t section_size = this->section_size(i); | |
4608 | ||
4609 | gold_assert(section_address >= view_address | |
4610 | && ((section_address + section_size) | |
4611 | <= (view_address + view_size))); | |
4612 | ||
4613 | unsigned char* section_view = view + (section_address - view_address); | |
4614 | ||
4615 | // Apply the Cortex-A8 workaround to the output address range | |
4616 | // corresponding to this input section. | |
4617 | stub_table->apply_cortex_a8_workaround_to_address_range( | |
4618 | arm_target, | |
4619 | section_view, | |
4620 | section_address, | |
4621 | section_size); | |
4622 | } | |
8ffa3667 DK |
4623 | } |
4624 | } | |
4625 | ||
a0351a69 DK |
4626 | // Helper functions for both Arm_relobj and Arm_dynobj to read ARM |
4627 | // ABI information. | |
4628 | ||
4629 | template<bool big_endian> | |
4630 | Attributes_section_data* | |
4631 | read_arm_attributes_section( | |
4632 | Object* object, | |
4633 | Read_symbols_data *sd) | |
4634 | { | |
4635 | // Read the attributes section if there is one. | |
4636 | // We read from the end because gas seems to put it near the end of | |
4637 | // the section headers. | |
4638 | const size_t shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
4639 | const unsigned char *ps = | |
4640 | sd->section_headers->data() + shdr_size * (object->shnum() - 1); | |
4641 | for (unsigned int i = object->shnum(); i > 0; --i, ps -= shdr_size) | |
4642 | { | |
4643 | elfcpp::Shdr<32, big_endian> shdr(ps); | |
4644 | if (shdr.get_sh_type() == elfcpp::SHT_ARM_ATTRIBUTES) | |
4645 | { | |
4646 | section_offset_type section_offset = shdr.get_sh_offset(); | |
4647 | section_size_type section_size = | |
4648 | convert_to_section_size_type(shdr.get_sh_size()); | |
4649 | File_view* view = object->get_lasting_view(section_offset, | |
4650 | section_size, true, false); | |
4651 | return new Attributes_section_data(view->data(), section_size); | |
4652 | } | |
4653 | } | |
4654 | return NULL; | |
4655 | } | |
4656 | ||
d5b40221 DK |
4657 | // Read the symbol information. |
4658 | ||
4659 | template<bool big_endian> | |
4660 | void | |
4661 | Arm_relobj<big_endian>::do_read_symbols(Read_symbols_data* sd) | |
4662 | { | |
4663 | // Call parent class to read symbol information. | |
4664 | Sized_relobj<32, big_endian>::do_read_symbols(sd); | |
4665 | ||
4666 | // Read processor-specific flags in ELF file header. | |
4667 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
4668 | elfcpp::Elf_sizes<32>::ehdr_size, | |
4669 | true, false); | |
4670 | elfcpp::Ehdr<32, big_endian> ehdr(pehdr); | |
4671 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
a0351a69 DK |
4672 | this->attributes_section_data_ = |
4673 | read_arm_attributes_section<big_endian>(this, sd); | |
d5b40221 DK |
4674 | } |
4675 | ||
99e5bff2 DK |
4676 | // Process relocations for garbage collection. The ARM target uses .ARM.exidx |
4677 | // sections for unwinding. These sections are referenced implicitly by | |
4678 | // text sections linked in the section headers. If we ignore these implict | |
4679 | // references, the .ARM.exidx sections and any .ARM.extab sections they use | |
4680 | // will be garbage-collected incorrectly. Hence we override the same function | |
4681 | // in the base class to handle these implicit references. | |
4682 | ||
4683 | template<bool big_endian> | |
4684 | void | |
4685 | Arm_relobj<big_endian>::do_gc_process_relocs(Symbol_table* symtab, | |
4686 | Layout* layout, | |
4687 | Read_relocs_data* rd) | |
4688 | { | |
4689 | // First, call base class method to process relocations in this object. | |
4690 | Sized_relobj<32, big_endian>::do_gc_process_relocs(symtab, layout, rd); | |
4691 | ||
4692 | unsigned int shnum = this->shnum(); | |
4693 | const unsigned int shdr_size = elfcpp::Elf_sizes<32>::shdr_size; | |
4694 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
4695 | shnum * shdr_size, | |
4696 | true, true); | |
4697 | ||
4698 | // Scan section headers for sections of type SHT_ARM_EXIDX. Add references | |
4699 | // to these from the linked text sections. | |
4700 | const unsigned char* ps = pshdrs + shdr_size; | |
4701 | for (unsigned int i = 1; i < shnum; ++i, ps += shdr_size) | |
4702 | { | |
4703 | elfcpp::Shdr<32, big_endian> shdr(ps); | |
4704 | if (shdr.get_sh_type() == elfcpp::SHT_ARM_EXIDX) | |
4705 | { | |
4706 | // Found an .ARM.exidx section, add it to the set of reachable | |
4707 | // sections from its linked text section. | |
4708 | unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_link()); | |
4709 | symtab->gc()->add_reference(this, text_shndx, this, i); | |
4710 | } | |
4711 | } | |
4712 | } | |
4713 | ||
d5b40221 DK |
4714 | // Arm_dynobj methods. |
4715 | ||
4716 | // Read the symbol information. | |
4717 | ||
4718 | template<bool big_endian> | |
4719 | void | |
4720 | Arm_dynobj<big_endian>::do_read_symbols(Read_symbols_data* sd) | |
4721 | { | |
4722 | // Call parent class to read symbol information. | |
4723 | Sized_dynobj<32, big_endian>::do_read_symbols(sd); | |
4724 | ||
4725 | // Read processor-specific flags in ELF file header. | |
4726 | const unsigned char* pehdr = this->get_view(elfcpp::file_header_offset, | |
4727 | elfcpp::Elf_sizes<32>::ehdr_size, | |
4728 | true, false); | |
4729 | elfcpp::Ehdr<32, big_endian> ehdr(pehdr); | |
4730 | this->processor_specific_flags_ = ehdr.get_e_flags(); | |
a0351a69 DK |
4731 | this->attributes_section_data_ = |
4732 | read_arm_attributes_section<big_endian>(this, sd); | |
d5b40221 DK |
4733 | } |
4734 | ||
e9bbb538 DK |
4735 | // Stub_addend_reader methods. |
4736 | ||
4737 | // Read the addend of a REL relocation of type R_TYPE at VIEW. | |
4738 | ||
4739 | template<bool big_endian> | |
4740 | elfcpp::Elf_types<32>::Elf_Swxword | |
4741 | Stub_addend_reader<elfcpp::SHT_REL, big_endian>::operator()( | |
4742 | unsigned int r_type, | |
4743 | const unsigned char* view, | |
4744 | const typename Reloc_types<elfcpp::SHT_REL, 32, big_endian>::Reloc&) const | |
4745 | { | |
089d69dc DK |
4746 | typedef struct Arm_relocate_functions<big_endian> RelocFuncs; |
4747 | ||
e9bbb538 DK |
4748 | switch (r_type) |
4749 | { | |
4750 | case elfcpp::R_ARM_CALL: | |
4751 | case elfcpp::R_ARM_JUMP24: | |
4752 | case elfcpp::R_ARM_PLT32: | |
4753 | { | |
4754 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
4755 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
4756 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
4757 | return utils::sign_extend<26>(val << 2); | |
4758 | } | |
4759 | ||
4760 | case elfcpp::R_ARM_THM_CALL: | |
4761 | case elfcpp::R_ARM_THM_JUMP24: | |
4762 | case elfcpp::R_ARM_THM_XPC22: | |
4763 | { | |
e9bbb538 DK |
4764 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; |
4765 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
4766 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
4767 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
089d69dc | 4768 | return RelocFuncs::thumb32_branch_offset(upper_insn, lower_insn); |
e9bbb538 DK |
4769 | } |
4770 | ||
4771 | case elfcpp::R_ARM_THM_JUMP19: | |
4772 | { | |
4773 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
4774 | const Valtype* wv = reinterpret_cast<const Valtype*>(view); | |
4775 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
4776 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
089d69dc | 4777 | return RelocFuncs::thumb32_cond_branch_offset(upper_insn, lower_insn); |
e9bbb538 DK |
4778 | } |
4779 | ||
4780 | default: | |
4781 | gold_unreachable(); | |
4782 | } | |
4783 | } | |
4784 | ||
94cdfcff DK |
4785 | // A class to handle the PLT data. |
4786 | ||
4787 | template<bool big_endian> | |
4788 | class Output_data_plt_arm : public Output_section_data | |
4789 | { | |
4790 | public: | |
4791 | typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, big_endian> | |
4792 | Reloc_section; | |
4793 | ||
4794 | Output_data_plt_arm(Layout*, Output_data_space*); | |
4795 | ||
4796 | // Add an entry to the PLT. | |
4797 | void | |
4798 | add_entry(Symbol* gsym); | |
4799 | ||
4800 | // Return the .rel.plt section data. | |
4801 | const Reloc_section* | |
4802 | rel_plt() const | |
4803 | { return this->rel_; } | |
4804 | ||
4805 | protected: | |
4806 | void | |
4807 | do_adjust_output_section(Output_section* os); | |
4808 | ||
4809 | // Write to a map file. | |
4810 | void | |
4811 | do_print_to_mapfile(Mapfile* mapfile) const | |
4812 | { mapfile->print_output_data(this, _("** PLT")); } | |
4813 | ||
4814 | private: | |
4815 | // Template for the first PLT entry. | |
4816 | static const uint32_t first_plt_entry[5]; | |
4817 | ||
4818 | // Template for subsequent PLT entries. | |
4819 | static const uint32_t plt_entry[3]; | |
4820 | ||
4821 | // Set the final size. | |
4822 | void | |
4823 | set_final_data_size() | |
4824 | { | |
4825 | this->set_data_size(sizeof(first_plt_entry) | |
4826 | + this->count_ * sizeof(plt_entry)); | |
4827 | } | |
4828 | ||
4829 | // Write out the PLT data. | |
4830 | void | |
4831 | do_write(Output_file*); | |
4832 | ||
4833 | // The reloc section. | |
4834 | Reloc_section* rel_; | |
4835 | // The .got.plt section. | |
4836 | Output_data_space* got_plt_; | |
4837 | // The number of PLT entries. | |
4838 | unsigned int count_; | |
4839 | }; | |
4840 | ||
4841 | // Create the PLT section. The ordinary .got section is an argument, | |
4842 | // since we need to refer to the start. We also create our own .got | |
4843 | // section just for PLT entries. | |
4844 | ||
4845 | template<bool big_endian> | |
2ea97941 | 4846 | Output_data_plt_arm<big_endian>::Output_data_plt_arm(Layout* layout, |
94cdfcff DK |
4847 | Output_data_space* got_plt) |
4848 | : Output_section_data(4), got_plt_(got_plt), count_(0) | |
4849 | { | |
4850 | this->rel_ = new Reloc_section(false); | |
2ea97941 | 4851 | layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL, |
1a2dff53 ILT |
4852 | elfcpp::SHF_ALLOC, this->rel_, true, false, |
4853 | false, false); | |
94cdfcff DK |
4854 | } |
4855 | ||
4856 | template<bool big_endian> | |
4857 | void | |
4858 | Output_data_plt_arm<big_endian>::do_adjust_output_section(Output_section* os) | |
4859 | { | |
4860 | os->set_entsize(0); | |
4861 | } | |
4862 | ||
4863 | // Add an entry to the PLT. | |
4864 | ||
4865 | template<bool big_endian> | |
4866 | void | |
4867 | Output_data_plt_arm<big_endian>::add_entry(Symbol* gsym) | |
4868 | { | |
4869 | gold_assert(!gsym->has_plt_offset()); | |
4870 | ||
4871 | // Note that when setting the PLT offset we skip the initial | |
4872 | // reserved PLT entry. | |
4873 | gsym->set_plt_offset((this->count_) * sizeof(plt_entry) | |
4874 | + sizeof(first_plt_entry)); | |
4875 | ||
4876 | ++this->count_; | |
4877 | ||
4878 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
4879 | ||
4880 | // Every PLT entry needs a GOT entry which points back to the PLT | |
4881 | // entry (this will be changed by the dynamic linker, normally | |
4882 | // lazily when the function is called). | |
4883 | this->got_plt_->set_current_data_size(got_offset + 4); | |
4884 | ||
4885 | // Every PLT entry needs a reloc. | |
4886 | gsym->set_needs_dynsym_entry(); | |
4887 | this->rel_->add_global(gsym, elfcpp::R_ARM_JUMP_SLOT, this->got_plt_, | |
4888 | got_offset); | |
4889 | ||
4890 | // Note that we don't need to save the symbol. The contents of the | |
4891 | // PLT are independent of which symbols are used. The symbols only | |
4892 | // appear in the relocations. | |
4893 | } | |
4894 | ||
4895 | // ARM PLTs. | |
4896 | // FIXME: This is not very flexible. Right now this has only been tested | |
4897 | // on armv5te. If we are to support additional architecture features like | |
4898 | // Thumb-2 or BE8, we need to make this more flexible like GNU ld. | |
4899 | ||
4900 | // The first entry in the PLT. | |
4901 | template<bool big_endian> | |
4902 | const uint32_t Output_data_plt_arm<big_endian>::first_plt_entry[5] = | |
4903 | { | |
4904 | 0xe52de004, // str lr, [sp, #-4]! | |
4905 | 0xe59fe004, // ldr lr, [pc, #4] | |
4906 | 0xe08fe00e, // add lr, pc, lr | |
4907 | 0xe5bef008, // ldr pc, [lr, #8]! | |
4908 | 0x00000000, // &GOT[0] - . | |
4909 | }; | |
4910 | ||
4911 | // Subsequent entries in the PLT. | |
4912 | ||
4913 | template<bool big_endian> | |
4914 | const uint32_t Output_data_plt_arm<big_endian>::plt_entry[3] = | |
4915 | { | |
4916 | 0xe28fc600, // add ip, pc, #0xNN00000 | |
4917 | 0xe28cca00, // add ip, ip, #0xNN000 | |
4918 | 0xe5bcf000, // ldr pc, [ip, #0xNNN]! | |
4919 | }; | |
4920 | ||
4921 | // Write out the PLT. This uses the hand-coded instructions above, | |
4922 | // and adjusts them as needed. This is all specified by the arm ELF | |
4923 | // Processor Supplement. | |
4924 | ||
4925 | template<bool big_endian> | |
4926 | void | |
4927 | Output_data_plt_arm<big_endian>::do_write(Output_file* of) | |
4928 | { | |
2ea97941 | 4929 | const off_t offset = this->offset(); |
94cdfcff DK |
4930 | const section_size_type oview_size = |
4931 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 4932 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
94cdfcff DK |
4933 | |
4934 | const off_t got_file_offset = this->got_plt_->offset(); | |
4935 | const section_size_type got_size = | |
4936 | convert_to_section_size_type(this->got_plt_->data_size()); | |
4937 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
4938 | got_size); | |
4939 | unsigned char* pov = oview; | |
4940 | ||
ebabffbd DK |
4941 | Arm_address plt_address = this->address(); |
4942 | Arm_address got_address = this->got_plt_->address(); | |
94cdfcff DK |
4943 | |
4944 | // Write first PLT entry. All but the last word are constants. | |
4945 | const size_t num_first_plt_words = (sizeof(first_plt_entry) | |
4946 | / sizeof(plt_entry[0])); | |
4947 | for (size_t i = 0; i < num_first_plt_words - 1; i++) | |
4948 | elfcpp::Swap<32, big_endian>::writeval(pov + i * 4, first_plt_entry[i]); | |
4949 | // Last word in first PLT entry is &GOT[0] - . | |
4950 | elfcpp::Swap<32, big_endian>::writeval(pov + 16, | |
4951 | got_address - (plt_address + 16)); | |
4952 | pov += sizeof(first_plt_entry); | |
4953 | ||
4954 | unsigned char* got_pov = got_view; | |
4955 | ||
4956 | memset(got_pov, 0, 12); | |
4957 | got_pov += 12; | |
4958 | ||
4959 | const int rel_size = elfcpp::Elf_sizes<32>::rel_size; | |
4960 | unsigned int plt_offset = sizeof(first_plt_entry); | |
4961 | unsigned int plt_rel_offset = 0; | |
4962 | unsigned int got_offset = 12; | |
4963 | const unsigned int count = this->count_; | |
4964 | for (unsigned int i = 0; | |
4965 | i < count; | |
4966 | ++i, | |
4967 | pov += sizeof(plt_entry), | |
4968 | got_pov += 4, | |
4969 | plt_offset += sizeof(plt_entry), | |
4970 | plt_rel_offset += rel_size, | |
4971 | got_offset += 4) | |
4972 | { | |
4973 | // Set and adjust the PLT entry itself. | |
2ea97941 ILT |
4974 | int32_t offset = ((got_address + got_offset) |
4975 | - (plt_address + plt_offset + 8)); | |
94cdfcff | 4976 | |
2ea97941 ILT |
4977 | gold_assert(offset >= 0 && offset < 0x0fffffff); |
4978 | uint32_t plt_insn0 = plt_entry[0] | ((offset >> 20) & 0xff); | |
94cdfcff | 4979 | elfcpp::Swap<32, big_endian>::writeval(pov, plt_insn0); |
2ea97941 | 4980 | uint32_t plt_insn1 = plt_entry[1] | ((offset >> 12) & 0xff); |
94cdfcff | 4981 | elfcpp::Swap<32, big_endian>::writeval(pov + 4, plt_insn1); |
2ea97941 | 4982 | uint32_t plt_insn2 = plt_entry[2] | (offset & 0xfff); |
94cdfcff DK |
4983 | elfcpp::Swap<32, big_endian>::writeval(pov + 8, plt_insn2); |
4984 | ||
4985 | // Set the entry in the GOT. | |
4986 | elfcpp::Swap<32, big_endian>::writeval(got_pov, plt_address); | |
4987 | } | |
4988 | ||
4989 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
4990 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
4991 | ||
2ea97941 | 4992 | of->write_output_view(offset, oview_size, oview); |
94cdfcff DK |
4993 | of->write_output_view(got_file_offset, got_size, got_view); |
4994 | } | |
4995 | ||
4996 | // Create a PLT entry for a global symbol. | |
4997 | ||
4998 | template<bool big_endian> | |
4999 | void | |
2ea97941 | 5000 | Target_arm<big_endian>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
94cdfcff DK |
5001 | Symbol* gsym) |
5002 | { | |
5003 | if (gsym->has_plt_offset()) | |
5004 | return; | |
5005 | ||
5006 | if (this->plt_ == NULL) | |
5007 | { | |
5008 | // Create the GOT sections first. | |
2ea97941 | 5009 | this->got_section(symtab, layout); |
94cdfcff | 5010 | |
2ea97941 ILT |
5011 | this->plt_ = new Output_data_plt_arm<big_endian>(layout, this->got_plt_); |
5012 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
5013 | (elfcpp::SHF_ALLOC | |
5014 | | elfcpp::SHF_EXECINSTR), | |
1a2dff53 | 5015 | this->plt_, false, false, false, false); |
94cdfcff DK |
5016 | } |
5017 | this->plt_->add_entry(gsym); | |
5018 | } | |
5019 | ||
4a657b0d DK |
5020 | // Report an unsupported relocation against a local symbol. |
5021 | ||
5022 | template<bool big_endian> | |
5023 | void | |
5024 | Target_arm<big_endian>::Scan::unsupported_reloc_local( | |
5025 | Sized_relobj<32, big_endian>* object, | |
5026 | unsigned int r_type) | |
5027 | { | |
5028 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
5029 | object->name().c_str(), r_type); | |
5030 | } | |
5031 | ||
bec53400 DK |
5032 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
5033 | // dynamic linker does not support it, issue an error. The GNU linker | |
5034 | // only issues a non-PIC error for an allocated read-only section. | |
5035 | // Here we know the section is allocated, but we don't know that it is | |
5036 | // read-only. But we check for all the relocation types which the | |
5037 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
5038 | // error even if the section is not read-only. | |
5039 | ||
5040 | template<bool big_endian> | |
5041 | void | |
5042 | Target_arm<big_endian>::Scan::check_non_pic(Relobj* object, | |
5043 | unsigned int r_type) | |
5044 | { | |
5045 | switch (r_type) | |
5046 | { | |
5047 | // These are the relocation types supported by glibc for ARM. | |
5048 | case elfcpp::R_ARM_RELATIVE: | |
5049 | case elfcpp::R_ARM_COPY: | |
5050 | case elfcpp::R_ARM_GLOB_DAT: | |
5051 | case elfcpp::R_ARM_JUMP_SLOT: | |
5052 | case elfcpp::R_ARM_ABS32: | |
be8fcb75 | 5053 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
5054 | case elfcpp::R_ARM_PC24: |
5055 | // FIXME: The following 3 types are not supported by Android's dynamic | |
5056 | // linker. | |
5057 | case elfcpp::R_ARM_TLS_DTPMOD32: | |
5058 | case elfcpp::R_ARM_TLS_DTPOFF32: | |
5059 | case elfcpp::R_ARM_TLS_TPOFF32: | |
5060 | return; | |
5061 | ||
5062 | default: | |
5063 | // This prevents us from issuing more than one error per reloc | |
5064 | // section. But we can still wind up issuing more than one | |
5065 | // error per object file. | |
5066 | if (this->issued_non_pic_error_) | |
5067 | return; | |
5068 | object->error(_("requires unsupported dynamic reloc; " | |
5069 | "recompile with -fPIC")); | |
5070 | this->issued_non_pic_error_ = true; | |
5071 | return; | |
5072 | ||
5073 | case elfcpp::R_ARM_NONE: | |
5074 | gold_unreachable(); | |
5075 | } | |
5076 | } | |
5077 | ||
4a657b0d | 5078 | // Scan a relocation for a local symbol. |
bec53400 DK |
5079 | // FIXME: This only handles a subset of relocation types used by Android |
5080 | // on ARM v5te devices. | |
4a657b0d DK |
5081 | |
5082 | template<bool big_endian> | |
5083 | inline void | |
ad0f2072 | 5084 | Target_arm<big_endian>::Scan::local(Symbol_table* symtab, |
2ea97941 | 5085 | Layout* layout, |
bec53400 | 5086 | Target_arm* target, |
4a657b0d | 5087 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
5088 | unsigned int data_shndx, |
5089 | Output_section* output_section, | |
5090 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
5091 | unsigned int r_type, |
5092 | const elfcpp::Sym<32, big_endian>&) | |
5093 | { | |
a6d1ef57 | 5094 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
5095 | switch (r_type) |
5096 | { | |
5097 | case elfcpp::R_ARM_NONE: | |
5098 | break; | |
5099 | ||
bec53400 | 5100 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 5101 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
5102 | // If building a shared library (or a position-independent |
5103 | // executable), we need to create a dynamic relocation for | |
5104 | // this location. The relocation applied at link time will | |
5105 | // apply the link-time value, so we flag the location with | |
5106 | // an R_ARM_RELATIVE relocation so the dynamic loader can | |
5107 | // relocate it easily. | |
5108 | if (parameters->options().output_is_position_independent()) | |
5109 | { | |
2ea97941 | 5110 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
5111 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
5112 | // If we are to add more other reloc types than R_ARM_ABS32, | |
5113 | // we need to add check_non_pic(object, r_type) here. | |
5114 | rel_dyn->add_local_relative(object, r_sym, elfcpp::R_ARM_RELATIVE, | |
5115 | output_section, data_shndx, | |
5116 | reloc.get_r_offset()); | |
5117 | } | |
5118 | break; | |
5119 | ||
5120 | case elfcpp::R_ARM_REL32: | |
5121 | case elfcpp::R_ARM_THM_CALL: | |
5122 | case elfcpp::R_ARM_CALL: | |
5123 | case elfcpp::R_ARM_PREL31: | |
5124 | case elfcpp::R_ARM_JUMP24: | |
41263c05 DK |
5125 | case elfcpp::R_ARM_THM_JUMP24: |
5126 | case elfcpp::R_ARM_THM_JUMP19: | |
bec53400 | 5127 | case elfcpp::R_ARM_PLT32: |
be8fcb75 ILT |
5128 | case elfcpp::R_ARM_THM_ABS5: |
5129 | case elfcpp::R_ARM_ABS8: | |
5130 | case elfcpp::R_ARM_ABS12: | |
5131 | case elfcpp::R_ARM_ABS16: | |
5132 | case elfcpp::R_ARM_BASE_ABS: | |
fd3c5f0b ILT |
5133 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5134 | case elfcpp::R_ARM_MOVT_ABS: | |
5135 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5136 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
5137 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5138 | case elfcpp::R_ARM_MOVT_PREL: | |
5139 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5140 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
bec53400 DK |
5141 | break; |
5142 | ||
5143 | case elfcpp::R_ARM_GOTOFF32: | |
5144 | // We need a GOT section: | |
2ea97941 | 5145 | target->got_section(symtab, layout); |
bec53400 DK |
5146 | break; |
5147 | ||
5148 | case elfcpp::R_ARM_BASE_PREL: | |
5149 | // FIXME: What about this? | |
5150 | break; | |
5151 | ||
5152 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5153 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
5154 | { |
5155 | // The symbol requires a GOT entry. | |
5156 | Output_data_got<32, big_endian>* got = | |
2ea97941 | 5157 | target->got_section(symtab, layout); |
bec53400 DK |
5158 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); |
5159 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) | |
5160 | { | |
5161 | // If we are generating a shared object, we need to add a | |
5162 | // dynamic RELATIVE relocation for this symbol's GOT entry. | |
5163 | if (parameters->options().output_is_position_independent()) | |
5164 | { | |
2ea97941 ILT |
5165 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
5166 | unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info()); | |
bec53400 | 5167 | rel_dyn->add_local_relative( |
2ea97941 ILT |
5168 | object, r_sym, elfcpp::R_ARM_RELATIVE, got, |
5169 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
bec53400 DK |
5170 | } |
5171 | } | |
5172 | } | |
5173 | break; | |
5174 | ||
5175 | case elfcpp::R_ARM_TARGET1: | |
5176 | // This should have been mapped to another type already. | |
5177 | // Fall through. | |
5178 | case elfcpp::R_ARM_COPY: | |
5179 | case elfcpp::R_ARM_GLOB_DAT: | |
5180 | case elfcpp::R_ARM_JUMP_SLOT: | |
5181 | case elfcpp::R_ARM_RELATIVE: | |
5182 | // These are relocations which should only be seen by the | |
5183 | // dynamic linker, and should never be seen here. | |
5184 | gold_error(_("%s: unexpected reloc %u in object file"), | |
5185 | object->name().c_str(), r_type); | |
5186 | break; | |
5187 | ||
4a657b0d DK |
5188 | default: |
5189 | unsupported_reloc_local(object, r_type); | |
5190 | break; | |
5191 | } | |
5192 | } | |
5193 | ||
5194 | // Report an unsupported relocation against a global symbol. | |
5195 | ||
5196 | template<bool big_endian> | |
5197 | void | |
5198 | Target_arm<big_endian>::Scan::unsupported_reloc_global( | |
5199 | Sized_relobj<32, big_endian>* object, | |
5200 | unsigned int r_type, | |
5201 | Symbol* gsym) | |
5202 | { | |
5203 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
5204 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
5205 | } | |
5206 | ||
5207 | // Scan a relocation for a global symbol. | |
bec53400 DK |
5208 | // FIXME: This only handles a subset of relocation types used by Android |
5209 | // on ARM v5te devices. | |
4a657b0d DK |
5210 | |
5211 | template<bool big_endian> | |
5212 | inline void | |
ad0f2072 | 5213 | Target_arm<big_endian>::Scan::global(Symbol_table* symtab, |
2ea97941 | 5214 | Layout* layout, |
bec53400 | 5215 | Target_arm* target, |
4a657b0d | 5216 | Sized_relobj<32, big_endian>* object, |
bec53400 DK |
5217 | unsigned int data_shndx, |
5218 | Output_section* output_section, | |
5219 | const elfcpp::Rel<32, big_endian>& reloc, | |
4a657b0d DK |
5220 | unsigned int r_type, |
5221 | Symbol* gsym) | |
5222 | { | |
a6d1ef57 | 5223 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
5224 | switch (r_type) |
5225 | { | |
5226 | case elfcpp::R_ARM_NONE: | |
5227 | break; | |
5228 | ||
bec53400 | 5229 | case elfcpp::R_ARM_ABS32: |
be8fcb75 | 5230 | case elfcpp::R_ARM_ABS32_NOI: |
bec53400 DK |
5231 | { |
5232 | // Make a dynamic relocation if necessary. | |
5233 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) | |
5234 | { | |
5235 | if (target->may_need_copy_reloc(gsym)) | |
5236 | { | |
2ea97941 | 5237 | target->copy_reloc(symtab, layout, object, |
bec53400 DK |
5238 | data_shndx, output_section, gsym, reloc); |
5239 | } | |
5240 | else if (gsym->can_use_relative_reloc(false)) | |
5241 | { | |
5242 | // If we are to add more other reloc types than R_ARM_ABS32, | |
5243 | // we need to add check_non_pic(object, r_type) here. | |
2ea97941 | 5244 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
5245 | rel_dyn->add_global_relative(gsym, elfcpp::R_ARM_RELATIVE, |
5246 | output_section, object, | |
5247 | data_shndx, reloc.get_r_offset()); | |
5248 | } | |
5249 | else | |
5250 | { | |
5251 | // If we are to add more other reloc types than R_ARM_ABS32, | |
5252 | // we need to add check_non_pic(object, r_type) here. | |
2ea97941 | 5253 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
5254 | rel_dyn->add_global(gsym, r_type, output_section, object, |
5255 | data_shndx, reloc.get_r_offset()); | |
5256 | } | |
5257 | } | |
5258 | } | |
5259 | break; | |
5260 | ||
fd3c5f0b ILT |
5261 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5262 | case elfcpp::R_ARM_MOVT_ABS: | |
5263 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5264 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
5265 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5266 | case elfcpp::R_ARM_MOVT_PREL: | |
5267 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5268 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
fd3c5f0b ILT |
5269 | break; |
5270 | ||
be8fcb75 ILT |
5271 | case elfcpp::R_ARM_THM_ABS5: |
5272 | case elfcpp::R_ARM_ABS8: | |
5273 | case elfcpp::R_ARM_ABS12: | |
5274 | case elfcpp::R_ARM_ABS16: | |
5275 | case elfcpp::R_ARM_BASE_ABS: | |
5276 | { | |
5277 | // No dynamic relocs of this kinds. | |
5278 | // Report the error in case of PIC. | |
5279 | int flags = Symbol::NON_PIC_REF; | |
5280 | if (gsym->type() == elfcpp::STT_FUNC | |
5281 | || gsym->type() == elfcpp::STT_ARM_TFUNC) | |
5282 | flags |= Symbol::FUNCTION_CALL; | |
5283 | if (gsym->needs_dynamic_reloc(flags)) | |
5284 | check_non_pic(object, r_type); | |
5285 | } | |
5286 | break; | |
5287 | ||
bec53400 DK |
5288 | case elfcpp::R_ARM_REL32: |
5289 | case elfcpp::R_ARM_PREL31: | |
5290 | { | |
5291 | // Make a dynamic relocation if necessary. | |
5292 | int flags = Symbol::NON_PIC_REF; | |
5293 | if (gsym->needs_dynamic_reloc(flags)) | |
5294 | { | |
5295 | if (target->may_need_copy_reloc(gsym)) | |
5296 | { | |
2ea97941 | 5297 | target->copy_reloc(symtab, layout, object, |
bec53400 DK |
5298 | data_shndx, output_section, gsym, reloc); |
5299 | } | |
5300 | else | |
5301 | { | |
5302 | check_non_pic(object, r_type); | |
2ea97941 | 5303 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
5304 | rel_dyn->add_global(gsym, r_type, output_section, object, |
5305 | data_shndx, reloc.get_r_offset()); | |
5306 | } | |
5307 | } | |
5308 | } | |
5309 | break; | |
5310 | ||
5311 | case elfcpp::R_ARM_JUMP24: | |
f4e5969c | 5312 | case elfcpp::R_ARM_THM_JUMP24: |
41263c05 | 5313 | case elfcpp::R_ARM_THM_JUMP19: |
bec53400 | 5314 | case elfcpp::R_ARM_CALL: |
f4e5969c DK |
5315 | case elfcpp::R_ARM_THM_CALL: |
5316 | ||
5317 | if (Target_arm<big_endian>::Scan::symbol_needs_plt_entry(gsym)) | |
2ea97941 | 5318 | target->make_plt_entry(symtab, layout, gsym); |
f4e5969c DK |
5319 | else |
5320 | { | |
5321 | // Check to see if this is a function that would need a PLT | |
5322 | // but does not get one because the function symbol is untyped. | |
5323 | // This happens in assembly code missing a proper .type directive. | |
5324 | if ((!gsym->is_undefined() || parameters->options().shared()) | |
5325 | && !parameters->doing_static_link() | |
5326 | && gsym->type() == elfcpp::STT_NOTYPE | |
5327 | && (gsym->is_from_dynobj() | |
5328 | || gsym->is_undefined() | |
5329 | || gsym->is_preemptible())) | |
5330 | gold_error(_("%s is not a function."), | |
5331 | gsym->demangled_name().c_str()); | |
5332 | } | |
bec53400 DK |
5333 | break; |
5334 | ||
5335 | case elfcpp::R_ARM_PLT32: | |
5336 | // If the symbol is fully resolved, this is just a relative | |
5337 | // local reloc. Otherwise we need a PLT entry. | |
5338 | if (gsym->final_value_is_known()) | |
5339 | break; | |
5340 | // If building a shared library, we can also skip the PLT entry | |
5341 | // if the symbol is defined in the output file and is protected | |
5342 | // or hidden. | |
5343 | if (gsym->is_defined() | |
5344 | && !gsym->is_from_dynobj() | |
5345 | && !gsym->is_preemptible()) | |
5346 | break; | |
2ea97941 | 5347 | target->make_plt_entry(symtab, layout, gsym); |
bec53400 DK |
5348 | break; |
5349 | ||
5350 | case elfcpp::R_ARM_GOTOFF32: | |
5351 | // We need a GOT section. | |
2ea97941 | 5352 | target->got_section(symtab, layout); |
bec53400 DK |
5353 | break; |
5354 | ||
5355 | case elfcpp::R_ARM_BASE_PREL: | |
5356 | // FIXME: What about this? | |
5357 | break; | |
5358 | ||
5359 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5360 | case elfcpp::R_ARM_GOT_PREL: |
bec53400 DK |
5361 | { |
5362 | // The symbol requires a GOT entry. | |
5363 | Output_data_got<32, big_endian>* got = | |
2ea97941 | 5364 | target->got_section(symtab, layout); |
bec53400 DK |
5365 | if (gsym->final_value_is_known()) |
5366 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
5367 | else | |
5368 | { | |
5369 | // If this symbol is not fully resolved, we need to add a | |
5370 | // GOT entry with a dynamic relocation. | |
2ea97941 | 5371 | Reloc_section* rel_dyn = target->rel_dyn_section(layout); |
bec53400 DK |
5372 | if (gsym->is_from_dynobj() |
5373 | || gsym->is_undefined() | |
5374 | || gsym->is_preemptible()) | |
5375 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, | |
5376 | rel_dyn, elfcpp::R_ARM_GLOB_DAT); | |
5377 | else | |
5378 | { | |
5379 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) | |
5380 | rel_dyn->add_global_relative( | |
5381 | gsym, elfcpp::R_ARM_RELATIVE, got, | |
5382 | gsym->got_offset(GOT_TYPE_STANDARD)); | |
5383 | } | |
5384 | } | |
5385 | } | |
5386 | break; | |
5387 | ||
5388 | case elfcpp::R_ARM_TARGET1: | |
5389 | // This should have been mapped to another type already. | |
5390 | // Fall through. | |
5391 | case elfcpp::R_ARM_COPY: | |
5392 | case elfcpp::R_ARM_GLOB_DAT: | |
5393 | case elfcpp::R_ARM_JUMP_SLOT: | |
5394 | case elfcpp::R_ARM_RELATIVE: | |
5395 | // These are relocations which should only be seen by the | |
5396 | // dynamic linker, and should never be seen here. | |
5397 | gold_error(_("%s: unexpected reloc %u in object file"), | |
5398 | object->name().c_str(), r_type); | |
5399 | break; | |
5400 | ||
4a657b0d DK |
5401 | default: |
5402 | unsupported_reloc_global(object, r_type, gsym); | |
5403 | break; | |
5404 | } | |
5405 | } | |
5406 | ||
5407 | // Process relocations for gc. | |
5408 | ||
5409 | template<bool big_endian> | |
5410 | void | |
ad0f2072 | 5411 | Target_arm<big_endian>::gc_process_relocs(Symbol_table* symtab, |
2ea97941 | 5412 | Layout* layout, |
4a657b0d DK |
5413 | Sized_relobj<32, big_endian>* object, |
5414 | unsigned int data_shndx, | |
5415 | unsigned int, | |
5416 | const unsigned char* prelocs, | |
5417 | size_t reloc_count, | |
5418 | Output_section* output_section, | |
5419 | bool needs_special_offset_handling, | |
5420 | size_t local_symbol_count, | |
5421 | const unsigned char* plocal_symbols) | |
5422 | { | |
5423 | typedef Target_arm<big_endian> Arm; | |
2ea97941 | 5424 | typedef typename Target_arm<big_endian>::Scan Scan; |
4a657b0d | 5425 | |
2ea97941 | 5426 | gold::gc_process_relocs<32, big_endian, Arm, elfcpp::SHT_REL, Scan>( |
4a657b0d | 5427 | symtab, |
2ea97941 | 5428 | layout, |
4a657b0d DK |
5429 | this, |
5430 | object, | |
5431 | data_shndx, | |
5432 | prelocs, | |
5433 | reloc_count, | |
5434 | output_section, | |
5435 | needs_special_offset_handling, | |
5436 | local_symbol_count, | |
5437 | plocal_symbols); | |
5438 | } | |
5439 | ||
5440 | // Scan relocations for a section. | |
5441 | ||
5442 | template<bool big_endian> | |
5443 | void | |
ad0f2072 | 5444 | Target_arm<big_endian>::scan_relocs(Symbol_table* symtab, |
2ea97941 | 5445 | Layout* layout, |
4a657b0d DK |
5446 | Sized_relobj<32, big_endian>* object, |
5447 | unsigned int data_shndx, | |
5448 | unsigned int sh_type, | |
5449 | const unsigned char* prelocs, | |
5450 | size_t reloc_count, | |
5451 | Output_section* output_section, | |
5452 | bool needs_special_offset_handling, | |
5453 | size_t local_symbol_count, | |
5454 | const unsigned char* plocal_symbols) | |
5455 | { | |
2ea97941 | 5456 | typedef typename Target_arm<big_endian>::Scan Scan; |
4a657b0d DK |
5457 | if (sh_type == elfcpp::SHT_RELA) |
5458 | { | |
5459 | gold_error(_("%s: unsupported RELA reloc section"), | |
5460 | object->name().c_str()); | |
5461 | return; | |
5462 | } | |
5463 | ||
2ea97941 | 5464 | gold::scan_relocs<32, big_endian, Target_arm, elfcpp::SHT_REL, Scan>( |
4a657b0d | 5465 | symtab, |
2ea97941 | 5466 | layout, |
4a657b0d DK |
5467 | this, |
5468 | object, | |
5469 | data_shndx, | |
5470 | prelocs, | |
5471 | reloc_count, | |
5472 | output_section, | |
5473 | needs_special_offset_handling, | |
5474 | local_symbol_count, | |
5475 | plocal_symbols); | |
5476 | } | |
5477 | ||
5478 | // Finalize the sections. | |
5479 | ||
5480 | template<bool big_endian> | |
5481 | void | |
d5b40221 | 5482 | Target_arm<big_endian>::do_finalize_sections( |
2ea97941 | 5483 | Layout* layout, |
f59f41f3 DK |
5484 | const Input_objects* input_objects, |
5485 | Symbol_table* symtab) | |
4a657b0d | 5486 | { |
d5b40221 DK |
5487 | // Merge processor-specific flags. |
5488 | for (Input_objects::Relobj_iterator p = input_objects->relobj_begin(); | |
5489 | p != input_objects->relobj_end(); | |
5490 | ++p) | |
5491 | { | |
5492 | Arm_relobj<big_endian>* arm_relobj = | |
5493 | Arm_relobj<big_endian>::as_arm_relobj(*p); | |
5494 | this->merge_processor_specific_flags( | |
5495 | arm_relobj->name(), | |
5496 | arm_relobj->processor_specific_flags()); | |
a0351a69 DK |
5497 | this->merge_object_attributes(arm_relobj->name().c_str(), |
5498 | arm_relobj->attributes_section_data()); | |
5499 | ||
d5b40221 DK |
5500 | } |
5501 | ||
5502 | for (Input_objects::Dynobj_iterator p = input_objects->dynobj_begin(); | |
5503 | p != input_objects->dynobj_end(); | |
5504 | ++p) | |
5505 | { | |
5506 | Arm_dynobj<big_endian>* arm_dynobj = | |
5507 | Arm_dynobj<big_endian>::as_arm_dynobj(*p); | |
5508 | this->merge_processor_specific_flags( | |
5509 | arm_dynobj->name(), | |
5510 | arm_dynobj->processor_specific_flags()); | |
a0351a69 DK |
5511 | this->merge_object_attributes(arm_dynobj->name().c_str(), |
5512 | arm_dynobj->attributes_section_data()); | |
d5b40221 DK |
5513 | } |
5514 | ||
a0351a69 | 5515 | // Check BLX use. |
41263c05 | 5516 | const Object_attribute* cpu_arch_attr = |
a0351a69 | 5517 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch); |
41263c05 | 5518 | if (cpu_arch_attr->int_value() > elfcpp::TAG_CPU_ARCH_V4) |
a0351a69 DK |
5519 | this->set_may_use_blx(true); |
5520 | ||
41263c05 DK |
5521 | // Check if we need to use Cortex-A8 workaround. |
5522 | if (parameters->options().user_set_fix_cortex_a8()) | |
5523 | this->fix_cortex_a8_ = parameters->options().fix_cortex_a8(); | |
5524 | else | |
5525 | { | |
5526 | // If neither --fix-cortex-a8 nor --no-fix-cortex-a8 is used, turn on | |
5527 | // Cortex-A8 erratum workaround for ARMv7-A or ARMv7 with unknown | |
5528 | // profile. | |
5529 | const Object_attribute* cpu_arch_profile_attr = | |
5530 | this->get_aeabi_object_attribute(elfcpp::Tag_CPU_arch_profile); | |
5531 | this->fix_cortex_a8_ = | |
5532 | (cpu_arch_attr->int_value() == elfcpp::TAG_CPU_ARCH_V7 | |
5533 | && (cpu_arch_profile_attr->int_value() == 'A' | |
5534 | || cpu_arch_profile_attr->int_value() == 0)); | |
5535 | } | |
5536 | ||
94cdfcff | 5537 | // Fill in some more dynamic tags. |
ea715a34 ILT |
5538 | const Reloc_section* rel_plt = (this->plt_ == NULL |
5539 | ? NULL | |
5540 | : this->plt_->rel_plt()); | |
5541 | layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt, | |
5542 | this->rel_dyn_, true); | |
94cdfcff DK |
5543 | |
5544 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
5545 | // relocs. | |
5546 | if (this->copy_relocs_.any_saved_relocs()) | |
2ea97941 | 5547 | this->copy_relocs_.emit(this->rel_dyn_section(layout)); |
11af873f | 5548 | |
f59f41f3 | 5549 | // Handle the .ARM.exidx section. |
2ea97941 | 5550 | Output_section* exidx_section = layout->find_output_section(".ARM.exidx"); |
f59f41f3 DK |
5551 | if (exidx_section != NULL |
5552 | && exidx_section->type() == elfcpp::SHT_ARM_EXIDX | |
11af873f DK |
5553 | && !parameters->options().relocatable()) |
5554 | { | |
f59f41f3 | 5555 | // Create __exidx_start and __exdix_end symbols. |
99fff23b ILT |
5556 | symtab->define_in_output_data("__exidx_start", NULL, |
5557 | Symbol_table::PREDEFINED, | |
5558 | exidx_section, 0, 0, elfcpp::STT_OBJECT, | |
a0351a69 | 5559 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, |
99e5bff2 | 5560 | false, true); |
99fff23b ILT |
5561 | symtab->define_in_output_data("__exidx_end", NULL, |
5562 | Symbol_table::PREDEFINED, | |
5563 | exidx_section, 0, 0, elfcpp::STT_OBJECT, | |
a0351a69 | 5564 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, 0, |
99e5bff2 | 5565 | true, true); |
11af873f | 5566 | |
f59f41f3 DK |
5567 | // For the ARM target, we need to add a PT_ARM_EXIDX segment for |
5568 | // the .ARM.exidx section. | |
2ea97941 | 5569 | if (!layout->script_options()->saw_phdrs_clause()) |
11af873f | 5570 | { |
2ea97941 | 5571 | gold_assert(layout->find_output_segment(elfcpp::PT_ARM_EXIDX, 0, 0) |
11af873f DK |
5572 | == NULL); |
5573 | Output_segment* exidx_segment = | |
2ea97941 | 5574 | layout->make_output_segment(elfcpp::PT_ARM_EXIDX, elfcpp::PF_R); |
f5c870d2 ILT |
5575 | exidx_segment->add_output_section(exidx_section, elfcpp::PF_R, |
5576 | false); | |
11af873f DK |
5577 | } |
5578 | } | |
a0351a69 DK |
5579 | |
5580 | // Create an .ARM.attributes section if there is not one already. | |
2ea97941 | 5581 | Output_attributes_section_data* attributes_section = |
a0351a69 | 5582 | new Output_attributes_section_data(*this->attributes_section_data_); |
2ea97941 ILT |
5583 | layout->add_output_section_data(".ARM.attributes", |
5584 | elfcpp::SHT_ARM_ATTRIBUTES, 0, | |
1a2dff53 ILT |
5585 | attributes_section, false, false, false, |
5586 | false); | |
4a657b0d DK |
5587 | } |
5588 | ||
bec53400 DK |
5589 | // Return whether a direct absolute static relocation needs to be applied. |
5590 | // In cases where Scan::local() or Scan::global() has created | |
5591 | // a dynamic relocation other than R_ARM_RELATIVE, the addend | |
5592 | // of the relocation is carried in the data, and we must not | |
5593 | // apply the static relocation. | |
5594 | ||
5595 | template<bool big_endian> | |
5596 | inline bool | |
5597 | Target_arm<big_endian>::Relocate::should_apply_static_reloc( | |
5598 | const Sized_symbol<32>* gsym, | |
5599 | int ref_flags, | |
5600 | bool is_32bit, | |
5601 | Output_section* output_section) | |
5602 | { | |
5603 | // If the output section is not allocated, then we didn't call | |
5604 | // scan_relocs, we didn't create a dynamic reloc, and we must apply | |
5605 | // the reloc here. | |
5606 | if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0) | |
5607 | return true; | |
5608 | ||
5609 | // For local symbols, we will have created a non-RELATIVE dynamic | |
5610 | // relocation only if (a) the output is position independent, | |
5611 | // (b) the relocation is absolute (not pc- or segment-relative), and | |
5612 | // (c) the relocation is not 32 bits wide. | |
5613 | if (gsym == NULL) | |
5614 | return !(parameters->options().output_is_position_independent() | |
5615 | && (ref_flags & Symbol::ABSOLUTE_REF) | |
5616 | && !is_32bit); | |
5617 | ||
5618 | // For global symbols, we use the same helper routines used in the | |
5619 | // scan pass. If we did not create a dynamic relocation, or if we | |
5620 | // created a RELATIVE dynamic relocation, we should apply the static | |
5621 | // relocation. | |
5622 | bool has_dyn = gsym->needs_dynamic_reloc(ref_flags); | |
5623 | bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF) | |
5624 | && gsym->can_use_relative_reloc(ref_flags | |
5625 | & Symbol::FUNCTION_CALL); | |
5626 | return !has_dyn || is_rel; | |
5627 | } | |
5628 | ||
4a657b0d DK |
5629 | // Perform a relocation. |
5630 | ||
5631 | template<bool big_endian> | |
5632 | inline bool | |
5633 | Target_arm<big_endian>::Relocate::relocate( | |
c121c671 DK |
5634 | const Relocate_info<32, big_endian>* relinfo, |
5635 | Target_arm* target, | |
5636 | Output_section *output_section, | |
5637 | size_t relnum, | |
5638 | const elfcpp::Rel<32, big_endian>& rel, | |
4a657b0d | 5639 | unsigned int r_type, |
c121c671 DK |
5640 | const Sized_symbol<32>* gsym, |
5641 | const Symbol_value<32>* psymval, | |
5642 | unsigned char* view, | |
ebabffbd | 5643 | Arm_address address, |
4a657b0d DK |
5644 | section_size_type /* view_size */ ) |
5645 | { | |
c121c671 DK |
5646 | typedef Arm_relocate_functions<big_endian> Arm_relocate_functions; |
5647 | ||
a6d1ef57 | 5648 | r_type = get_real_reloc_type(r_type); |
c121c671 | 5649 | |
2daedcd6 DK |
5650 | const Arm_relobj<big_endian>* object = |
5651 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
c121c671 | 5652 | |
2daedcd6 DK |
5653 | // If the final branch target of a relocation is THUMB instruction, this |
5654 | // is 1. Otherwise it is 0. | |
5655 | Arm_address thumb_bit = 0; | |
c121c671 | 5656 | Symbol_value<32> symval; |
d204b6e9 | 5657 | bool is_weakly_undefined_without_plt = false; |
2daedcd6 | 5658 | if (relnum != Target_arm<big_endian>::fake_relnum_for_stubs) |
c121c671 | 5659 | { |
2daedcd6 DK |
5660 | if (gsym != NULL) |
5661 | { | |
5662 | // This is a global symbol. Determine if we use PLT and if the | |
5663 | // final target is THUMB. | |
5664 | if (gsym->use_plt_offset(reloc_is_non_pic(r_type))) | |
5665 | { | |
5666 | // This uses a PLT, change the symbol value. | |
5667 | symval.set_output_value(target->plt_section()->address() | |
5668 | + gsym->plt_offset()); | |
5669 | psymval = &symval; | |
5670 | } | |
d204b6e9 DK |
5671 | else if (gsym->is_weak_undefined()) |
5672 | { | |
5673 | // This is a weakly undefined symbol and we do not use PLT | |
5674 | // for this relocation. A branch targeting this symbol will | |
5675 | // be converted into an NOP. | |
5676 | is_weakly_undefined_without_plt = true; | |
5677 | } | |
2daedcd6 DK |
5678 | else |
5679 | { | |
5680 | // Set thumb bit if symbol: | |
5681 | // -Has type STT_ARM_TFUNC or | |
5682 | // -Has type STT_FUNC, is defined and with LSB in value set. | |
5683 | thumb_bit = | |
5684 | (((gsym->type() == elfcpp::STT_ARM_TFUNC) | |
5685 | || (gsym->type() == elfcpp::STT_FUNC | |
5686 | && !gsym->is_undefined() | |
5687 | && ((psymval->value(object, 0) & 1) != 0))) | |
5688 | ? 1 | |
5689 | : 0); | |
5690 | } | |
5691 | } | |
5692 | else | |
5693 | { | |
5694 | // This is a local symbol. Determine if the final target is THUMB. | |
5695 | // We saved this information when all the local symbols were read. | |
5696 | elfcpp::Elf_types<32>::Elf_WXword r_info = rel.get_r_info(); | |
5697 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
5698 | thumb_bit = object->local_symbol_is_thumb_function(r_sym) ? 1 : 0; | |
5699 | } | |
5700 | } | |
5701 | else | |
5702 | { | |
5703 | // This is a fake relocation synthesized for a stub. It does not have | |
5704 | // a real symbol. We just look at the LSB of the symbol value to | |
5705 | // determine if the target is THUMB or not. | |
5706 | thumb_bit = ((psymval->value(object, 0) & 1) != 0); | |
c121c671 DK |
5707 | } |
5708 | ||
2daedcd6 DK |
5709 | // Strip LSB if this points to a THUMB target. |
5710 | if (thumb_bit != 0 | |
5711 | && Target_arm<big_endian>::reloc_uses_thumb_bit(r_type) | |
5712 | && ((psymval->value(object, 0) & 1) != 0)) | |
5713 | { | |
5714 | Arm_address stripped_value = | |
5715 | psymval->value(object, 0) & ~static_cast<Arm_address>(1); | |
5716 | symval.set_output_value(stripped_value); | |
5717 | psymval = &symval; | |
5718 | } | |
5719 | ||
c121c671 DK |
5720 | // Get the GOT offset if needed. |
5721 | // The GOT pointer points to the end of the GOT section. | |
5722 | // We need to subtract the size of the GOT section to get | |
5723 | // the actual offset to use in the relocation. | |
5724 | bool have_got_offset = false; | |
5725 | unsigned int got_offset = 0; | |
5726 | switch (r_type) | |
5727 | { | |
5728 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 5729 | case elfcpp::R_ARM_GOT_PREL: |
c121c671 DK |
5730 | if (gsym != NULL) |
5731 | { | |
5732 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
5733 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) | |
5734 | - target->got_size()); | |
5735 | } | |
5736 | else | |
5737 | { | |
5738 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
5739 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
5740 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
5741 | - target->got_size()); | |
5742 | } | |
5743 | have_got_offset = true; | |
5744 | break; | |
5745 | ||
5746 | default: | |
5747 | break; | |
5748 | } | |
5749 | ||
d204b6e9 DK |
5750 | // To look up relocation stubs, we need to pass the symbol table index of |
5751 | // a local symbol. | |
5752 | unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info()); | |
5753 | ||
c121c671 DK |
5754 | typename Arm_relocate_functions::Status reloc_status = |
5755 | Arm_relocate_functions::STATUS_OKAY; | |
4a657b0d DK |
5756 | switch (r_type) |
5757 | { | |
5758 | case elfcpp::R_ARM_NONE: | |
5759 | break; | |
5760 | ||
5e445df6 ILT |
5761 | case elfcpp::R_ARM_ABS8: |
5762 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5763 | output_section)) | |
be8fcb75 ILT |
5764 | reloc_status = Arm_relocate_functions::abs8(view, object, psymval); |
5765 | break; | |
5766 | ||
5767 | case elfcpp::R_ARM_ABS12: | |
5768 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5769 | output_section)) | |
5770 | reloc_status = Arm_relocate_functions::abs12(view, object, psymval); | |
5771 | break; | |
5772 | ||
5773 | case elfcpp::R_ARM_ABS16: | |
5774 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5775 | output_section)) | |
5776 | reloc_status = Arm_relocate_functions::abs16(view, object, psymval); | |
5e445df6 ILT |
5777 | break; |
5778 | ||
c121c671 DK |
5779 | case elfcpp::R_ARM_ABS32: |
5780 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5781 | output_section)) | |
5782 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
2daedcd6 | 5783 | thumb_bit); |
c121c671 DK |
5784 | break; |
5785 | ||
be8fcb75 ILT |
5786 | case elfcpp::R_ARM_ABS32_NOI: |
5787 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5788 | output_section)) | |
5789 | // No thumb bit for this relocation: (S + A) | |
5790 | reloc_status = Arm_relocate_functions::abs32(view, object, psymval, | |
f4e5969c | 5791 | 0); |
be8fcb75 ILT |
5792 | break; |
5793 | ||
fd3c5f0b ILT |
5794 | case elfcpp::R_ARM_MOVW_ABS_NC: |
5795 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5796 | output_section)) | |
5797 | reloc_status = Arm_relocate_functions::movw_abs_nc(view, object, | |
5798 | psymval, | |
2daedcd6 | 5799 | thumb_bit); |
fd3c5f0b ILT |
5800 | else |
5801 | gold_error(_("relocation R_ARM_MOVW_ABS_NC cannot be used when making" | |
5802 | "a shared object; recompile with -fPIC")); | |
5803 | break; | |
5804 | ||
5805 | case elfcpp::R_ARM_MOVT_ABS: | |
5806 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5807 | output_section)) | |
5808 | reloc_status = Arm_relocate_functions::movt_abs(view, object, psymval); | |
5809 | else | |
5810 | gold_error(_("relocation R_ARM_MOVT_ABS cannot be used when making" | |
5811 | "a shared object; recompile with -fPIC")); | |
5812 | break; | |
5813 | ||
5814 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
5815 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5816 | output_section)) | |
5817 | reloc_status = Arm_relocate_functions::thm_movw_abs_nc(view, object, | |
5818 | psymval, | |
2daedcd6 | 5819 | thumb_bit); |
fd3c5f0b ILT |
5820 | else |
5821 | gold_error(_("relocation R_ARM_THM_MOVW_ABS_NC cannot be used when" | |
5822 | "making a shared object; recompile with -fPIC")); | |
5823 | break; | |
5824 | ||
5825 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
5826 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5827 | output_section)) | |
5828 | reloc_status = Arm_relocate_functions::thm_movt_abs(view, object, | |
5829 | psymval); | |
5830 | else | |
5831 | gold_error(_("relocation R_ARM_THM_MOVT_ABS cannot be used when" | |
5832 | "making a shared object; recompile with -fPIC")); | |
5833 | break; | |
5834 | ||
c2a122b6 ILT |
5835 | case elfcpp::R_ARM_MOVW_PREL_NC: |
5836 | reloc_status = Arm_relocate_functions::movw_prel_nc(view, object, | |
5837 | psymval, address, | |
2daedcd6 | 5838 | thumb_bit); |
c2a122b6 ILT |
5839 | break; |
5840 | ||
5841 | case elfcpp::R_ARM_MOVT_PREL: | |
5842 | reloc_status = Arm_relocate_functions::movt_prel(view, object, | |
5843 | psymval, address); | |
5844 | break; | |
5845 | ||
5846 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
5847 | reloc_status = Arm_relocate_functions::thm_movw_prel_nc(view, object, | |
5848 | psymval, address, | |
2daedcd6 | 5849 | thumb_bit); |
c2a122b6 ILT |
5850 | break; |
5851 | ||
5852 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
5853 | reloc_status = Arm_relocate_functions::thm_movt_prel(view, object, | |
5854 | psymval, address); | |
5855 | break; | |
5856 | ||
c121c671 DK |
5857 | case elfcpp::R_ARM_REL32: |
5858 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
2daedcd6 | 5859 | address, thumb_bit); |
c121c671 DK |
5860 | break; |
5861 | ||
be8fcb75 ILT |
5862 | case elfcpp::R_ARM_THM_ABS5: |
5863 | if (should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, false, | |
5864 | output_section)) | |
5865 | reloc_status = Arm_relocate_functions::thm_abs5(view, object, psymval); | |
5866 | break; | |
5867 | ||
c121c671 | 5868 | case elfcpp::R_ARM_THM_CALL: |
51938283 DK |
5869 | reloc_status = |
5870 | Arm_relocate_functions::thm_call(relinfo, view, gsym, object, r_sym, | |
5871 | psymval, address, thumb_bit, | |
5872 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5873 | break; |
5874 | ||
d204b6e9 DK |
5875 | case elfcpp::R_ARM_XPC25: |
5876 | reloc_status = | |
5877 | Arm_relocate_functions::xpc25(relinfo, view, gsym, object, r_sym, | |
5878 | psymval, address, thumb_bit, | |
5879 | is_weakly_undefined_without_plt); | |
5880 | break; | |
5881 | ||
51938283 DK |
5882 | case elfcpp::R_ARM_THM_XPC22: |
5883 | reloc_status = | |
5884 | Arm_relocate_functions::thm_xpc22(relinfo, view, gsym, object, r_sym, | |
5885 | psymval, address, thumb_bit, | |
5886 | is_weakly_undefined_without_plt); | |
5887 | break; | |
5888 | ||
c121c671 DK |
5889 | case elfcpp::R_ARM_GOTOFF32: |
5890 | { | |
ebabffbd | 5891 | Arm_address got_origin; |
c121c671 DK |
5892 | got_origin = target->got_plt_section()->address(); |
5893 | reloc_status = Arm_relocate_functions::rel32(view, object, psymval, | |
2daedcd6 | 5894 | got_origin, thumb_bit); |
c121c671 DK |
5895 | } |
5896 | break; | |
5897 | ||
5898 | case elfcpp::R_ARM_BASE_PREL: | |
5899 | { | |
5900 | uint32_t origin; | |
5901 | // Get the addressing origin of the output segment defining the | |
5902 | // symbol gsym (AAELF 4.6.1.2 Relocation types) | |
5903 | gold_assert(gsym != NULL); | |
5904 | if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
5905 | origin = gsym->output_segment()->vaddr(); | |
5906 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
5907 | origin = gsym->output_data()->address(); | |
5908 | else | |
5909 | { | |
5910 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5911 | _("cannot find origin of R_ARM_BASE_PREL")); | |
5912 | return true; | |
5913 | } | |
5914 | reloc_status = Arm_relocate_functions::base_prel(view, origin, address); | |
5915 | } | |
5916 | break; | |
5917 | ||
be8fcb75 ILT |
5918 | case elfcpp::R_ARM_BASE_ABS: |
5919 | { | |
5920 | if (!should_apply_static_reloc(gsym, Symbol::ABSOLUTE_REF, true, | |
5921 | output_section)) | |
5922 | break; | |
5923 | ||
5924 | uint32_t origin; | |
5925 | // Get the addressing origin of the output segment defining | |
5926 | // the symbol gsym (AAELF 4.6.1.2 Relocation types). | |
5927 | if (gsym == NULL) | |
5928 | // R_ARM_BASE_ABS with the NULL symbol will give the | |
5929 | // absolute address of the GOT origin (GOT_ORG) (see ARM IHI | |
5930 | // 0044C (AAELF): 4.6.1.8 Proxy generating relocations). | |
5931 | origin = target->got_plt_section()->address(); | |
5932 | else if (gsym->source() == Symbol::IN_OUTPUT_SEGMENT) | |
5933 | origin = gsym->output_segment()->vaddr(); | |
5934 | else if (gsym->source () == Symbol::IN_OUTPUT_DATA) | |
5935 | origin = gsym->output_data()->address(); | |
5936 | else | |
5937 | { | |
5938 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
5939 | _("cannot find origin of R_ARM_BASE_ABS")); | |
5940 | return true; | |
5941 | } | |
5942 | ||
5943 | reloc_status = Arm_relocate_functions::base_abs(view, origin); | |
5944 | } | |
5945 | break; | |
5946 | ||
c121c671 DK |
5947 | case elfcpp::R_ARM_GOT_BREL: |
5948 | gold_assert(have_got_offset); | |
5949 | reloc_status = Arm_relocate_functions::got_brel(view, got_offset); | |
5950 | break; | |
5951 | ||
7f5309a5 ILT |
5952 | case elfcpp::R_ARM_GOT_PREL: |
5953 | gold_assert(have_got_offset); | |
5954 | // Get the address origin for GOT PLT, which is allocated right | |
5955 | // after the GOT section, to calculate an absolute address of | |
5956 | // the symbol GOT entry (got_origin + got_offset). | |
ebabffbd | 5957 | Arm_address got_origin; |
7f5309a5 ILT |
5958 | got_origin = target->got_plt_section()->address(); |
5959 | reloc_status = Arm_relocate_functions::got_prel(view, | |
5960 | got_origin + got_offset, | |
5961 | address); | |
5962 | break; | |
5963 | ||
c121c671 DK |
5964 | case elfcpp::R_ARM_PLT32: |
5965 | gold_assert(gsym == NULL | |
5966 | || gsym->has_plt_offset() | |
5967 | || gsym->final_value_is_known() | |
5968 | || (gsym->is_defined() | |
5969 | && !gsym->is_from_dynobj() | |
5970 | && !gsym->is_preemptible())); | |
d204b6e9 DK |
5971 | reloc_status = |
5972 | Arm_relocate_functions::plt32(relinfo, view, gsym, object, r_sym, | |
5973 | psymval, address, thumb_bit, | |
5974 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5975 | break; |
5976 | ||
5977 | case elfcpp::R_ARM_CALL: | |
d204b6e9 DK |
5978 | reloc_status = |
5979 | Arm_relocate_functions::call(relinfo, view, gsym, object, r_sym, | |
5980 | psymval, address, thumb_bit, | |
5981 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5982 | break; |
5983 | ||
5984 | case elfcpp::R_ARM_JUMP24: | |
d204b6e9 DK |
5985 | reloc_status = |
5986 | Arm_relocate_functions::jump24(relinfo, view, gsym, object, r_sym, | |
5987 | psymval, address, thumb_bit, | |
5988 | is_weakly_undefined_without_plt); | |
c121c671 DK |
5989 | break; |
5990 | ||
51938283 DK |
5991 | case elfcpp::R_ARM_THM_JUMP24: |
5992 | reloc_status = | |
5993 | Arm_relocate_functions::thm_jump24(relinfo, view, gsym, object, r_sym, | |
5994 | psymval, address, thumb_bit, | |
5995 | is_weakly_undefined_without_plt); | |
5996 | break; | |
5997 | ||
41263c05 DK |
5998 | case elfcpp::R_ARM_THM_JUMP19: |
5999 | reloc_status = | |
6000 | Arm_relocate_functions::thm_jump19(view, object, psymval, address, | |
6001 | thumb_bit); | |
6002 | break; | |
6003 | ||
c121c671 DK |
6004 | case elfcpp::R_ARM_PREL31: |
6005 | reloc_status = Arm_relocate_functions::prel31(view, object, psymval, | |
2daedcd6 | 6006 | address, thumb_bit); |
c121c671 DK |
6007 | break; |
6008 | ||
6009 | case elfcpp::R_ARM_TARGET1: | |
6010 | // This should have been mapped to another type already. | |
6011 | // Fall through. | |
6012 | case elfcpp::R_ARM_COPY: | |
6013 | case elfcpp::R_ARM_GLOB_DAT: | |
6014 | case elfcpp::R_ARM_JUMP_SLOT: | |
6015 | case elfcpp::R_ARM_RELATIVE: | |
6016 | // These are relocations which should only be seen by the | |
6017 | // dynamic linker, and should never be seen here. | |
6018 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
6019 | _("unexpected reloc %u in object file"), | |
6020 | r_type); | |
6021 | break; | |
6022 | ||
6023 | default: | |
6024 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
6025 | _("unsupported reloc %u"), | |
6026 | r_type); | |
6027 | break; | |
6028 | } | |
6029 | ||
6030 | // Report any errors. | |
6031 | switch (reloc_status) | |
6032 | { | |
6033 | case Arm_relocate_functions::STATUS_OKAY: | |
6034 | break; | |
6035 | case Arm_relocate_functions::STATUS_OVERFLOW: | |
6036 | gold_error_at_location(relinfo, relnum, rel.get_r_offset(), | |
6037 | _("relocation overflow in relocation %u"), | |
6038 | r_type); | |
6039 | break; | |
6040 | case Arm_relocate_functions::STATUS_BAD_RELOC: | |
6041 | gold_error_at_location( | |
6042 | relinfo, | |
6043 | relnum, | |
6044 | rel.get_r_offset(), | |
6045 | _("unexpected opcode while processing relocation %u"), | |
6046 | r_type); | |
6047 | break; | |
4a657b0d DK |
6048 | default: |
6049 | gold_unreachable(); | |
6050 | } | |
6051 | ||
6052 | return true; | |
6053 | } | |
6054 | ||
6055 | // Relocate section data. | |
6056 | ||
6057 | template<bool big_endian> | |
6058 | void | |
6059 | Target_arm<big_endian>::relocate_section( | |
6060 | const Relocate_info<32, big_endian>* relinfo, | |
6061 | unsigned int sh_type, | |
6062 | const unsigned char* prelocs, | |
6063 | size_t reloc_count, | |
6064 | Output_section* output_section, | |
6065 | bool needs_special_offset_handling, | |
6066 | unsigned char* view, | |
ebabffbd | 6067 | Arm_address address, |
364c7fa5 ILT |
6068 | section_size_type view_size, |
6069 | const Reloc_symbol_changes* reloc_symbol_changes) | |
4a657b0d DK |
6070 | { |
6071 | typedef typename Target_arm<big_endian>::Relocate Arm_relocate; | |
6072 | gold_assert(sh_type == elfcpp::SHT_REL); | |
6073 | ||
43d12afe DK |
6074 | Arm_input_section<big_endian>* arm_input_section = |
6075 | this->find_arm_input_section(relinfo->object, relinfo->data_shndx); | |
6076 | ||
6077 | // This is an ARM input section and the view covers the whole output | |
6078 | // section. | |
6079 | if (arm_input_section != NULL) | |
6080 | { | |
6081 | gold_assert(needs_special_offset_handling); | |
6082 | Arm_address section_address = arm_input_section->address(); | |
6083 | section_size_type section_size = arm_input_section->data_size(); | |
6084 | ||
6085 | gold_assert((arm_input_section->address() >= address) | |
6086 | && ((arm_input_section->address() | |
6087 | + arm_input_section->data_size()) | |
6088 | <= (address + view_size))); | |
6089 | ||
2ea97941 ILT |
6090 | off_t offset = section_address - address; |
6091 | view += offset; | |
6092 | address += offset; | |
43d12afe DK |
6093 | view_size = section_size; |
6094 | } | |
6095 | ||
4a657b0d DK |
6096 | gold::relocate_section<32, big_endian, Target_arm, elfcpp::SHT_REL, |
6097 | Arm_relocate>( | |
6098 | relinfo, | |
6099 | this, | |
6100 | prelocs, | |
6101 | reloc_count, | |
6102 | output_section, | |
6103 | needs_special_offset_handling, | |
6104 | view, | |
6105 | address, | |
364c7fa5 ILT |
6106 | view_size, |
6107 | reloc_symbol_changes); | |
4a657b0d DK |
6108 | } |
6109 | ||
6110 | // Return the size of a relocation while scanning during a relocatable | |
6111 | // link. | |
6112 | ||
6113 | template<bool big_endian> | |
6114 | unsigned int | |
6115 | Target_arm<big_endian>::Relocatable_size_for_reloc::get_size_for_reloc( | |
6116 | unsigned int r_type, | |
6117 | Relobj* object) | |
6118 | { | |
a6d1ef57 | 6119 | r_type = get_real_reloc_type(r_type); |
4a657b0d DK |
6120 | switch (r_type) |
6121 | { | |
6122 | case elfcpp::R_ARM_NONE: | |
6123 | return 0; | |
6124 | ||
5e445df6 ILT |
6125 | case elfcpp::R_ARM_ABS8: |
6126 | return 1; | |
6127 | ||
be8fcb75 ILT |
6128 | case elfcpp::R_ARM_ABS16: |
6129 | case elfcpp::R_ARM_THM_ABS5: | |
6130 | return 2; | |
6131 | ||
4a657b0d | 6132 | case elfcpp::R_ARM_ABS32: |
be8fcb75 ILT |
6133 | case elfcpp::R_ARM_ABS32_NOI: |
6134 | case elfcpp::R_ARM_ABS12: | |
6135 | case elfcpp::R_ARM_BASE_ABS: | |
4a657b0d DK |
6136 | case elfcpp::R_ARM_REL32: |
6137 | case elfcpp::R_ARM_THM_CALL: | |
6138 | case elfcpp::R_ARM_GOTOFF32: | |
6139 | case elfcpp::R_ARM_BASE_PREL: | |
6140 | case elfcpp::R_ARM_GOT_BREL: | |
7f5309a5 | 6141 | case elfcpp::R_ARM_GOT_PREL: |
4a657b0d DK |
6142 | case elfcpp::R_ARM_PLT32: |
6143 | case elfcpp::R_ARM_CALL: | |
6144 | case elfcpp::R_ARM_JUMP24: | |
6145 | case elfcpp::R_ARM_PREL31: | |
fd3c5f0b ILT |
6146 | case elfcpp::R_ARM_MOVW_ABS_NC: |
6147 | case elfcpp::R_ARM_MOVT_ABS: | |
6148 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
6149 | case elfcpp::R_ARM_THM_MOVT_ABS: | |
c2a122b6 ILT |
6150 | case elfcpp::R_ARM_MOVW_PREL_NC: |
6151 | case elfcpp::R_ARM_MOVT_PREL: | |
6152 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
6153 | case elfcpp::R_ARM_THM_MOVT_PREL: | |
4a657b0d DK |
6154 | return 4; |
6155 | ||
6156 | case elfcpp::R_ARM_TARGET1: | |
6157 | // This should have been mapped to another type already. | |
6158 | // Fall through. | |
6159 | case elfcpp::R_ARM_COPY: | |
6160 | case elfcpp::R_ARM_GLOB_DAT: | |
6161 | case elfcpp::R_ARM_JUMP_SLOT: | |
6162 | case elfcpp::R_ARM_RELATIVE: | |
6163 | // These are relocations which should only be seen by the | |
6164 | // dynamic linker, and should never be seen here. | |
6165 | gold_error(_("%s: unexpected reloc %u in object file"), | |
6166 | object->name().c_str(), r_type); | |
6167 | return 0; | |
6168 | ||
6169 | default: | |
6170 | object->error(_("unsupported reloc %u in object file"), r_type); | |
6171 | return 0; | |
6172 | } | |
6173 | } | |
6174 | ||
6175 | // Scan the relocs during a relocatable link. | |
6176 | ||
6177 | template<bool big_endian> | |
6178 | void | |
6179 | Target_arm<big_endian>::scan_relocatable_relocs( | |
4a657b0d | 6180 | Symbol_table* symtab, |
2ea97941 | 6181 | Layout* layout, |
4a657b0d DK |
6182 | Sized_relobj<32, big_endian>* object, |
6183 | unsigned int data_shndx, | |
6184 | unsigned int sh_type, | |
6185 | const unsigned char* prelocs, | |
6186 | size_t reloc_count, | |
6187 | Output_section* output_section, | |
6188 | bool needs_special_offset_handling, | |
6189 | size_t local_symbol_count, | |
6190 | const unsigned char* plocal_symbols, | |
6191 | Relocatable_relocs* rr) | |
6192 | { | |
6193 | gold_assert(sh_type == elfcpp::SHT_REL); | |
6194 | ||
6195 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL, | |
6196 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
6197 | ||
6198 | gold::scan_relocatable_relocs<32, big_endian, elfcpp::SHT_REL, | |
6199 | Scan_relocatable_relocs>( | |
4a657b0d | 6200 | symtab, |
2ea97941 | 6201 | layout, |
4a657b0d DK |
6202 | object, |
6203 | data_shndx, | |
6204 | prelocs, | |
6205 | reloc_count, | |
6206 | output_section, | |
6207 | needs_special_offset_handling, | |
6208 | local_symbol_count, | |
6209 | plocal_symbols, | |
6210 | rr); | |
6211 | } | |
6212 | ||
6213 | // Relocate a section during a relocatable link. | |
6214 | ||
6215 | template<bool big_endian> | |
6216 | void | |
6217 | Target_arm<big_endian>::relocate_for_relocatable( | |
6218 | const Relocate_info<32, big_endian>* relinfo, | |
6219 | unsigned int sh_type, | |
6220 | const unsigned char* prelocs, | |
6221 | size_t reloc_count, | |
6222 | Output_section* output_section, | |
6223 | off_t offset_in_output_section, | |
6224 | const Relocatable_relocs* rr, | |
6225 | unsigned char* view, | |
ebabffbd | 6226 | Arm_address view_address, |
4a657b0d DK |
6227 | section_size_type view_size, |
6228 | unsigned char* reloc_view, | |
6229 | section_size_type reloc_view_size) | |
6230 | { | |
6231 | gold_assert(sh_type == elfcpp::SHT_REL); | |
6232 | ||
6233 | gold::relocate_for_relocatable<32, big_endian, elfcpp::SHT_REL>( | |
6234 | relinfo, | |
6235 | prelocs, | |
6236 | reloc_count, | |
6237 | output_section, | |
6238 | offset_in_output_section, | |
6239 | rr, | |
6240 | view, | |
6241 | view_address, | |
6242 | view_size, | |
6243 | reloc_view, | |
6244 | reloc_view_size); | |
6245 | } | |
6246 | ||
94cdfcff DK |
6247 | // Return the value to use for a dynamic symbol which requires special |
6248 | // treatment. This is how we support equality comparisons of function | |
6249 | // pointers across shared library boundaries, as described in the | |
6250 | // processor specific ABI supplement. | |
6251 | ||
4a657b0d DK |
6252 | template<bool big_endian> |
6253 | uint64_t | |
94cdfcff | 6254 | Target_arm<big_endian>::do_dynsym_value(const Symbol* gsym) const |
4a657b0d | 6255 | { |
94cdfcff DK |
6256 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); |
6257 | return this->plt_section()->address() + gsym->plt_offset(); | |
4a657b0d DK |
6258 | } |
6259 | ||
6260 | // Map platform-specific relocs to real relocs | |
6261 | // | |
6262 | template<bool big_endian> | |
6263 | unsigned int | |
a6d1ef57 | 6264 | Target_arm<big_endian>::get_real_reloc_type (unsigned int r_type) |
4a657b0d DK |
6265 | { |
6266 | switch (r_type) | |
6267 | { | |
6268 | case elfcpp::R_ARM_TARGET1: | |
a6d1ef57 DK |
6269 | // This is either R_ARM_ABS32 or R_ARM_REL32; |
6270 | return elfcpp::R_ARM_ABS32; | |
4a657b0d DK |
6271 | |
6272 | case elfcpp::R_ARM_TARGET2: | |
a6d1ef57 DK |
6273 | // This can be any reloc type but ususally is R_ARM_GOT_PREL |
6274 | return elfcpp::R_ARM_GOT_PREL; | |
4a657b0d DK |
6275 | |
6276 | default: | |
6277 | return r_type; | |
6278 | } | |
6279 | } | |
6280 | ||
d5b40221 DK |
6281 | // Whether if two EABI versions V1 and V2 are compatible. |
6282 | ||
6283 | template<bool big_endian> | |
6284 | bool | |
6285 | Target_arm<big_endian>::are_eabi_versions_compatible( | |
6286 | elfcpp::Elf_Word v1, | |
6287 | elfcpp::Elf_Word v2) | |
6288 | { | |
6289 | // v4 and v5 are the same spec before and after it was released, | |
6290 | // so allow mixing them. | |
6291 | if ((v1 == elfcpp::EF_ARM_EABI_VER4 && v2 == elfcpp::EF_ARM_EABI_VER5) | |
6292 | || (v1 == elfcpp::EF_ARM_EABI_VER5 && v2 == elfcpp::EF_ARM_EABI_VER4)) | |
6293 | return true; | |
6294 | ||
6295 | return v1 == v2; | |
6296 | } | |
6297 | ||
6298 | // Combine FLAGS from an input object called NAME and the processor-specific | |
6299 | // flags in the ELF header of the output. Much of this is adapted from the | |
6300 | // processor-specific flags merging code in elf32_arm_merge_private_bfd_data | |
6301 | // in bfd/elf32-arm.c. | |
6302 | ||
6303 | template<bool big_endian> | |
6304 | void | |
6305 | Target_arm<big_endian>::merge_processor_specific_flags( | |
6306 | const std::string& name, | |
6307 | elfcpp::Elf_Word flags) | |
6308 | { | |
6309 | if (this->are_processor_specific_flags_set()) | |
6310 | { | |
6311 | elfcpp::Elf_Word out_flags = this->processor_specific_flags(); | |
6312 | ||
6313 | // Nothing to merge if flags equal to those in output. | |
6314 | if (flags == out_flags) | |
6315 | return; | |
6316 | ||
6317 | // Complain about various flag mismatches. | |
6318 | elfcpp::Elf_Word version1 = elfcpp::arm_eabi_version(flags); | |
6319 | elfcpp::Elf_Word version2 = elfcpp::arm_eabi_version(out_flags); | |
6320 | if (!this->are_eabi_versions_compatible(version1, version2)) | |
6321 | gold_error(_("Source object %s has EABI version %d but output has " | |
6322 | "EABI version %d."), | |
6323 | name.c_str(), | |
6324 | (flags & elfcpp::EF_ARM_EABIMASK) >> 24, | |
6325 | (out_flags & elfcpp::EF_ARM_EABIMASK) >> 24); | |
6326 | } | |
6327 | else | |
6328 | { | |
6329 | // If the input is the default architecture and had the default | |
6330 | // flags then do not bother setting the flags for the output | |
6331 | // architecture, instead allow future merges to do this. If no | |
6332 | // future merges ever set these flags then they will retain their | |
6333 | // uninitialised values, which surprise surprise, correspond | |
6334 | // to the default values. | |
6335 | if (flags == 0) | |
6336 | return; | |
6337 | ||
6338 | // This is the first time, just copy the flags. | |
6339 | // We only copy the EABI version for now. | |
6340 | this->set_processor_specific_flags(flags & elfcpp::EF_ARM_EABIMASK); | |
6341 | } | |
6342 | } | |
6343 | ||
6344 | // Adjust ELF file header. | |
6345 | template<bool big_endian> | |
6346 | void | |
6347 | Target_arm<big_endian>::do_adjust_elf_header( | |
6348 | unsigned char* view, | |
6349 | int len) const | |
6350 | { | |
6351 | gold_assert(len == elfcpp::Elf_sizes<32>::ehdr_size); | |
6352 | ||
6353 | elfcpp::Ehdr<32, big_endian> ehdr(view); | |
6354 | unsigned char e_ident[elfcpp::EI_NIDENT]; | |
6355 | memcpy(e_ident, ehdr.get_e_ident(), elfcpp::EI_NIDENT); | |
6356 | ||
6357 | if (elfcpp::arm_eabi_version(this->processor_specific_flags()) | |
6358 | == elfcpp::EF_ARM_EABI_UNKNOWN) | |
6359 | e_ident[elfcpp::EI_OSABI] = elfcpp::ELFOSABI_ARM; | |
6360 | else | |
6361 | e_ident[elfcpp::EI_OSABI] = 0; | |
6362 | e_ident[elfcpp::EI_ABIVERSION] = 0; | |
6363 | ||
6364 | // FIXME: Do EF_ARM_BE8 adjustment. | |
6365 | ||
6366 | elfcpp::Ehdr_write<32, big_endian> oehdr(view); | |
6367 | oehdr.put_e_ident(e_ident); | |
6368 | } | |
6369 | ||
6370 | // do_make_elf_object to override the same function in the base class. | |
6371 | // We need to use a target-specific sub-class of Sized_relobj<32, big_endian> | |
6372 | // to store ARM specific information. Hence we need to have our own | |
6373 | // ELF object creation. | |
6374 | ||
6375 | template<bool big_endian> | |
6376 | Object* | |
6377 | Target_arm<big_endian>::do_make_elf_object( | |
6378 | const std::string& name, | |
6379 | Input_file* input_file, | |
2ea97941 | 6380 | off_t offset, const elfcpp::Ehdr<32, big_endian>& ehdr) |
d5b40221 DK |
6381 | { |
6382 | int et = ehdr.get_e_type(); | |
6383 | if (et == elfcpp::ET_REL) | |
6384 | { | |
6385 | Arm_relobj<big_endian>* obj = | |
2ea97941 | 6386 | new Arm_relobj<big_endian>(name, input_file, offset, ehdr); |
d5b40221 DK |
6387 | obj->setup(); |
6388 | return obj; | |
6389 | } | |
6390 | else if (et == elfcpp::ET_DYN) | |
6391 | { | |
6392 | Sized_dynobj<32, big_endian>* obj = | |
2ea97941 | 6393 | new Arm_dynobj<big_endian>(name, input_file, offset, ehdr); |
d5b40221 DK |
6394 | obj->setup(); |
6395 | return obj; | |
6396 | } | |
6397 | else | |
6398 | { | |
6399 | gold_error(_("%s: unsupported ELF file type %d"), | |
6400 | name.c_str(), et); | |
6401 | return NULL; | |
6402 | } | |
6403 | } | |
6404 | ||
a0351a69 DK |
6405 | // Read the architecture from the Tag_also_compatible_with attribute, if any. |
6406 | // Returns -1 if no architecture could be read. | |
6407 | // This is adapted from get_secondary_compatible_arch() in bfd/elf32-arm.c. | |
6408 | ||
6409 | template<bool big_endian> | |
6410 | int | |
6411 | Target_arm<big_endian>::get_secondary_compatible_arch( | |
6412 | const Attributes_section_data* pasd) | |
6413 | { | |
6414 | const Object_attribute *known_attributes = | |
6415 | pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC); | |
6416 | ||
6417 | // Note: the tag and its argument below are uleb128 values, though | |
6418 | // currently-defined values fit in one byte for each. | |
6419 | const std::string& sv = | |
6420 | known_attributes[elfcpp::Tag_also_compatible_with].string_value(); | |
6421 | if (sv.size() == 2 | |
6422 | && sv.data()[0] == elfcpp::Tag_CPU_arch | |
6423 | && (sv.data()[1] & 128) != 128) | |
6424 | return sv.data()[1]; | |
6425 | ||
6426 | // This tag is "safely ignorable", so don't complain if it looks funny. | |
6427 | return -1; | |
6428 | } | |
6429 | ||
6430 | // Set, or unset, the architecture of the Tag_also_compatible_with attribute. | |
6431 | // The tag is removed if ARCH is -1. | |
6432 | // This is adapted from set_secondary_compatible_arch() in bfd/elf32-arm.c. | |
6433 | ||
6434 | template<bool big_endian> | |
6435 | void | |
6436 | Target_arm<big_endian>::set_secondary_compatible_arch( | |
6437 | Attributes_section_data* pasd, | |
6438 | int arch) | |
6439 | { | |
6440 | Object_attribute *known_attributes = | |
6441 | pasd->known_attributes(Object_attribute::OBJ_ATTR_PROC); | |
6442 | ||
6443 | if (arch == -1) | |
6444 | { | |
6445 | known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(""); | |
6446 | return; | |
6447 | } | |
6448 | ||
6449 | // Note: the tag and its argument below are uleb128 values, though | |
6450 | // currently-defined values fit in one byte for each. | |
6451 | char sv[3]; | |
6452 | sv[0] = elfcpp::Tag_CPU_arch; | |
6453 | gold_assert(arch != 0); | |
6454 | sv[1] = arch; | |
6455 | sv[2] = '\0'; | |
6456 | ||
6457 | known_attributes[elfcpp::Tag_also_compatible_with].set_string_value(sv); | |
6458 | } | |
6459 | ||
6460 | // Combine two values for Tag_CPU_arch, taking secondary compatibility tags | |
6461 | // into account. | |
6462 | // This is adapted from tag_cpu_arch_combine() in bfd/elf32-arm.c. | |
6463 | ||
6464 | template<bool big_endian> | |
6465 | int | |
6466 | Target_arm<big_endian>::tag_cpu_arch_combine( | |
6467 | const char* name, | |
6468 | int oldtag, | |
6469 | int* secondary_compat_out, | |
6470 | int newtag, | |
6471 | int secondary_compat) | |
6472 | { | |
6473 | #define T(X) elfcpp::TAG_CPU_ARCH_##X | |
6474 | static const int v6t2[] = | |
6475 | { | |
6476 | T(V6T2), // PRE_V4. | |
6477 | T(V6T2), // V4. | |
6478 | T(V6T2), // V4T. | |
6479 | T(V6T2), // V5T. | |
6480 | T(V6T2), // V5TE. | |
6481 | T(V6T2), // V5TEJ. | |
6482 | T(V6T2), // V6. | |
6483 | T(V7), // V6KZ. | |
6484 | T(V6T2) // V6T2. | |
6485 | }; | |
6486 | static const int v6k[] = | |
6487 | { | |
6488 | T(V6K), // PRE_V4. | |
6489 | T(V6K), // V4. | |
6490 | T(V6K), // V4T. | |
6491 | T(V6K), // V5T. | |
6492 | T(V6K), // V5TE. | |
6493 | T(V6K), // V5TEJ. | |
6494 | T(V6K), // V6. | |
6495 | T(V6KZ), // V6KZ. | |
6496 | T(V7), // V6T2. | |
6497 | T(V6K) // V6K. | |
6498 | }; | |
6499 | static const int v7[] = | |
6500 | { | |
6501 | T(V7), // PRE_V4. | |
6502 | T(V7), // V4. | |
6503 | T(V7), // V4T. | |
6504 | T(V7), // V5T. | |
6505 | T(V7), // V5TE. | |
6506 | T(V7), // V5TEJ. | |
6507 | T(V7), // V6. | |
6508 | T(V7), // V6KZ. | |
6509 | T(V7), // V6T2. | |
6510 | T(V7), // V6K. | |
6511 | T(V7) // V7. | |
6512 | }; | |
6513 | static const int v6_m[] = | |
6514 | { | |
6515 | -1, // PRE_V4. | |
6516 | -1, // V4. | |
6517 | T(V6K), // V4T. | |
6518 | T(V6K), // V5T. | |
6519 | T(V6K), // V5TE. | |
6520 | T(V6K), // V5TEJ. | |
6521 | T(V6K), // V6. | |
6522 | T(V6KZ), // V6KZ. | |
6523 | T(V7), // V6T2. | |
6524 | T(V6K), // V6K. | |
6525 | T(V7), // V7. | |
6526 | T(V6_M) // V6_M. | |
6527 | }; | |
6528 | static const int v6s_m[] = | |
6529 | { | |
6530 | -1, // PRE_V4. | |
6531 | -1, // V4. | |
6532 | T(V6K), // V4T. | |
6533 | T(V6K), // V5T. | |
6534 | T(V6K), // V5TE. | |
6535 | T(V6K), // V5TEJ. | |
6536 | T(V6K), // V6. | |
6537 | T(V6KZ), // V6KZ. | |
6538 | T(V7), // V6T2. | |
6539 | T(V6K), // V6K. | |
6540 | T(V7), // V7. | |
6541 | T(V6S_M), // V6_M. | |
6542 | T(V6S_M) // V6S_M. | |
6543 | }; | |
6544 | static const int v7e_m[] = | |
6545 | { | |
6546 | -1, // PRE_V4. | |
6547 | -1, // V4. | |
6548 | T(V7E_M), // V4T. | |
6549 | T(V7E_M), // V5T. | |
6550 | T(V7E_M), // V5TE. | |
6551 | T(V7E_M), // V5TEJ. | |
6552 | T(V7E_M), // V6. | |
6553 | T(V7E_M), // V6KZ. | |
6554 | T(V7E_M), // V6T2. | |
6555 | T(V7E_M), // V6K. | |
6556 | T(V7E_M), // V7. | |
6557 | T(V7E_M), // V6_M. | |
6558 | T(V7E_M), // V6S_M. | |
6559 | T(V7E_M) // V7E_M. | |
6560 | }; | |
6561 | static const int v4t_plus_v6_m[] = | |
6562 | { | |
6563 | -1, // PRE_V4. | |
6564 | -1, // V4. | |
6565 | T(V4T), // V4T. | |
6566 | T(V5T), // V5T. | |
6567 | T(V5TE), // V5TE. | |
6568 | T(V5TEJ), // V5TEJ. | |
6569 | T(V6), // V6. | |
6570 | T(V6KZ), // V6KZ. | |
6571 | T(V6T2), // V6T2. | |
6572 | T(V6K), // V6K. | |
6573 | T(V7), // V7. | |
6574 | T(V6_M), // V6_M. | |
6575 | T(V6S_M), // V6S_M. | |
6576 | T(V7E_M), // V7E_M. | |
6577 | T(V4T_PLUS_V6_M) // V4T plus V6_M. | |
6578 | }; | |
6579 | static const int *comb[] = | |
6580 | { | |
6581 | v6t2, | |
6582 | v6k, | |
6583 | v7, | |
6584 | v6_m, | |
6585 | v6s_m, | |
6586 | v7e_m, | |
6587 | // Pseudo-architecture. | |
6588 | v4t_plus_v6_m | |
6589 | }; | |
6590 | ||
6591 | // Check we've not got a higher architecture than we know about. | |
6592 | ||
6593 | if (oldtag >= elfcpp::MAX_TAG_CPU_ARCH || newtag >= elfcpp::MAX_TAG_CPU_ARCH) | |
6594 | { | |
6595 | gold_error(_("%s: unknown CPU architecture"), name); | |
6596 | return -1; | |
6597 | } | |
6598 | ||
6599 | // Override old tag if we have a Tag_also_compatible_with on the output. | |
6600 | ||
6601 | if ((oldtag == T(V6_M) && *secondary_compat_out == T(V4T)) | |
6602 | || (oldtag == T(V4T) && *secondary_compat_out == T(V6_M))) | |
6603 | oldtag = T(V4T_PLUS_V6_M); | |
6604 | ||
6605 | // And override the new tag if we have a Tag_also_compatible_with on the | |
6606 | // input. | |
6607 | ||
6608 | if ((newtag == T(V6_M) && secondary_compat == T(V4T)) | |
6609 | || (newtag == T(V4T) && secondary_compat == T(V6_M))) | |
6610 | newtag = T(V4T_PLUS_V6_M); | |
6611 | ||
6612 | // Architectures before V6KZ add features monotonically. | |
6613 | int tagh = std::max(oldtag, newtag); | |
6614 | if (tagh <= elfcpp::TAG_CPU_ARCH_V6KZ) | |
6615 | return tagh; | |
6616 | ||
6617 | int tagl = std::min(oldtag, newtag); | |
6618 | int result = comb[tagh - T(V6T2)][tagl]; | |
6619 | ||
6620 | // Use Tag_CPU_arch == V4T and Tag_also_compatible_with (Tag_CPU_arch V6_M) | |
6621 | // as the canonical version. | |
6622 | if (result == T(V4T_PLUS_V6_M)) | |
6623 | { | |
6624 | result = T(V4T); | |
6625 | *secondary_compat_out = T(V6_M); | |
6626 | } | |
6627 | else | |
6628 | *secondary_compat_out = -1; | |
6629 | ||
6630 | if (result == -1) | |
6631 | { | |
6632 | gold_error(_("%s: conflicting CPU architectures %d/%d"), | |
6633 | name, oldtag, newtag); | |
6634 | return -1; | |
6635 | } | |
6636 | ||
6637 | return result; | |
6638 | #undef T | |
6639 | } | |
6640 | ||
6641 | // Helper to print AEABI enum tag value. | |
6642 | ||
6643 | template<bool big_endian> | |
6644 | std::string | |
6645 | Target_arm<big_endian>::aeabi_enum_name(unsigned int value) | |
6646 | { | |
6647 | static const char *aeabi_enum_names[] = | |
6648 | { "", "variable-size", "32-bit", "" }; | |
6649 | const size_t aeabi_enum_names_size = | |
6650 | sizeof(aeabi_enum_names) / sizeof(aeabi_enum_names[0]); | |
6651 | ||
6652 | if (value < aeabi_enum_names_size) | |
6653 | return std::string(aeabi_enum_names[value]); | |
6654 | else | |
6655 | { | |
6656 | char buffer[100]; | |
6657 | sprintf(buffer, "<unknown value %u>", value); | |
6658 | return std::string(buffer); | |
6659 | } | |
6660 | } | |
6661 | ||
6662 | // Return the string value to store in TAG_CPU_name. | |
6663 | ||
6664 | template<bool big_endian> | |
6665 | std::string | |
6666 | Target_arm<big_endian>::tag_cpu_name_value(unsigned int value) | |
6667 | { | |
6668 | static const char *name_table[] = { | |
6669 | // These aren't real CPU names, but we can't guess | |
6670 | // that from the architecture version alone. | |
6671 | "Pre v4", | |
6672 | "ARM v4", | |
6673 | "ARM v4T", | |
6674 | "ARM v5T", | |
6675 | "ARM v5TE", | |
6676 | "ARM v5TEJ", | |
6677 | "ARM v6", | |
6678 | "ARM v6KZ", | |
6679 | "ARM v6T2", | |
6680 | "ARM v6K", | |
6681 | "ARM v7", | |
6682 | "ARM v6-M", | |
6683 | "ARM v6S-M", | |
6684 | "ARM v7E-M" | |
6685 | }; | |
6686 | const size_t name_table_size = sizeof(name_table) / sizeof(name_table[0]); | |
6687 | ||
6688 | if (value < name_table_size) | |
6689 | return std::string(name_table[value]); | |
6690 | else | |
6691 | { | |
6692 | char buffer[100]; | |
6693 | sprintf(buffer, "<unknown CPU value %u>", value); | |
6694 | return std::string(buffer); | |
6695 | } | |
6696 | } | |
6697 | ||
6698 | // Merge object attributes from input file called NAME with those of the | |
6699 | // output. The input object attributes are in the object pointed by PASD. | |
6700 | ||
6701 | template<bool big_endian> | |
6702 | void | |
6703 | Target_arm<big_endian>::merge_object_attributes( | |
6704 | const char* name, | |
6705 | const Attributes_section_data* pasd) | |
6706 | { | |
6707 | // Return if there is no attributes section data. | |
6708 | if (pasd == NULL) | |
6709 | return; | |
6710 | ||
6711 | // If output has no object attributes, just copy. | |
6712 | if (this->attributes_section_data_ == NULL) | |
6713 | { | |
6714 | this->attributes_section_data_ = new Attributes_section_data(*pasd); | |
6715 | return; | |
6716 | } | |
6717 | ||
6718 | const int vendor = Object_attribute::OBJ_ATTR_PROC; | |
6719 | const Object_attribute* in_attr = pasd->known_attributes(vendor); | |
6720 | Object_attribute* out_attr = | |
6721 | this->attributes_section_data_->known_attributes(vendor); | |
6722 | ||
6723 | // This needs to happen before Tag_ABI_FP_number_model is merged. */ | |
6724 | if (in_attr[elfcpp::Tag_ABI_VFP_args].int_value() | |
6725 | != out_attr[elfcpp::Tag_ABI_VFP_args].int_value()) | |
6726 | { | |
6727 | // Ignore mismatches if the object doesn't use floating point. */ | |
6728 | if (out_attr[elfcpp::Tag_ABI_FP_number_model].int_value() == 0) | |
6729 | out_attr[elfcpp::Tag_ABI_VFP_args].set_int_value( | |
6730 | in_attr[elfcpp::Tag_ABI_VFP_args].int_value()); | |
6731 | else if (in_attr[elfcpp::Tag_ABI_FP_number_model].int_value() != 0) | |
6732 | gold_error(_("%s uses VFP register arguments, output does not"), | |
6733 | name); | |
6734 | } | |
6735 | ||
6736 | for (int i = 4; i < Vendor_object_attributes::NUM_KNOWN_ATTRIBUTES; ++i) | |
6737 | { | |
6738 | // Merge this attribute with existing attributes. | |
6739 | switch (i) | |
6740 | { | |
6741 | case elfcpp::Tag_CPU_raw_name: | |
6742 | case elfcpp::Tag_CPU_name: | |
6743 | // These are merged after Tag_CPU_arch. | |
6744 | break; | |
6745 | ||
6746 | case elfcpp::Tag_ABI_optimization_goals: | |
6747 | case elfcpp::Tag_ABI_FP_optimization_goals: | |
6748 | // Use the first value seen. | |
6749 | break; | |
6750 | ||
6751 | case elfcpp::Tag_CPU_arch: | |
6752 | { | |
6753 | unsigned int saved_out_attr = out_attr->int_value(); | |
6754 | // Merge Tag_CPU_arch and Tag_also_compatible_with. | |
6755 | int secondary_compat = | |
6756 | this->get_secondary_compatible_arch(pasd); | |
6757 | int secondary_compat_out = | |
6758 | this->get_secondary_compatible_arch( | |
6759 | this->attributes_section_data_); | |
6760 | out_attr[i].set_int_value( | |
6761 | tag_cpu_arch_combine(name, out_attr[i].int_value(), | |
6762 | &secondary_compat_out, | |
6763 | in_attr[i].int_value(), | |
6764 | secondary_compat)); | |
6765 | this->set_secondary_compatible_arch(this->attributes_section_data_, | |
6766 | secondary_compat_out); | |
6767 | ||
6768 | // Merge Tag_CPU_name and Tag_CPU_raw_name. | |
6769 | if (out_attr[i].int_value() == saved_out_attr) | |
6770 | ; // Leave the names alone. | |
6771 | else if (out_attr[i].int_value() == in_attr[i].int_value()) | |
6772 | { | |
6773 | // The output architecture has been changed to match the | |
6774 | // input architecture. Use the input names. | |
6775 | out_attr[elfcpp::Tag_CPU_name].set_string_value( | |
6776 | in_attr[elfcpp::Tag_CPU_name].string_value()); | |
6777 | out_attr[elfcpp::Tag_CPU_raw_name].set_string_value( | |
6778 | in_attr[elfcpp::Tag_CPU_raw_name].string_value()); | |
6779 | } | |
6780 | else | |
6781 | { | |
6782 | out_attr[elfcpp::Tag_CPU_name].set_string_value(""); | |
6783 | out_attr[elfcpp::Tag_CPU_raw_name].set_string_value(""); | |
6784 | } | |
6785 | ||
6786 | // If we still don't have a value for Tag_CPU_name, | |
6787 | // make one up now. Tag_CPU_raw_name remains blank. | |
6788 | if (out_attr[elfcpp::Tag_CPU_name].string_value() == "") | |
6789 | { | |
6790 | const std::string cpu_name = | |
6791 | this->tag_cpu_name_value(out_attr[i].int_value()); | |
6792 | // FIXME: If we see an unknown CPU, this will be set | |
6793 | // to "<unknown CPU n>", where n is the attribute value. | |
6794 | // This is different from BFD, which leaves the name alone. | |
6795 | out_attr[elfcpp::Tag_CPU_name].set_string_value(cpu_name); | |
6796 | } | |
6797 | } | |
6798 | break; | |
6799 | ||
6800 | case elfcpp::Tag_ARM_ISA_use: | |
6801 | case elfcpp::Tag_THUMB_ISA_use: | |
6802 | case elfcpp::Tag_WMMX_arch: | |
6803 | case elfcpp::Tag_Advanced_SIMD_arch: | |
6804 | // ??? Do Advanced_SIMD (NEON) and WMMX conflict? | |
6805 | case elfcpp::Tag_ABI_FP_rounding: | |
6806 | case elfcpp::Tag_ABI_FP_exceptions: | |
6807 | case elfcpp::Tag_ABI_FP_user_exceptions: | |
6808 | case elfcpp::Tag_ABI_FP_number_model: | |
6809 | case elfcpp::Tag_VFP_HP_extension: | |
6810 | case elfcpp::Tag_CPU_unaligned_access: | |
6811 | case elfcpp::Tag_T2EE_use: | |
6812 | case elfcpp::Tag_Virtualization_use: | |
6813 | case elfcpp::Tag_MPextension_use: | |
6814 | // Use the largest value specified. | |
6815 | if (in_attr[i].int_value() > out_attr[i].int_value()) | |
6816 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6817 | break; | |
6818 | ||
6819 | case elfcpp::Tag_ABI_align8_preserved: | |
6820 | case elfcpp::Tag_ABI_PCS_RO_data: | |
6821 | // Use the smallest value specified. | |
6822 | if (in_attr[i].int_value() < out_attr[i].int_value()) | |
6823 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6824 | break; | |
6825 | ||
6826 | case elfcpp::Tag_ABI_align8_needed: | |
6827 | if ((in_attr[i].int_value() > 0 || out_attr[i].int_value() > 0) | |
6828 | && (in_attr[elfcpp::Tag_ABI_align8_preserved].int_value() == 0 | |
6829 | || (out_attr[elfcpp::Tag_ABI_align8_preserved].int_value() | |
6830 | == 0))) | |
6831 | { | |
6832 | // This error message should be enabled once all non-conformant | |
6833 | // binaries in the toolchain have had the attributes set | |
6834 | // properly. | |
6835 | // gold_error(_("output 8-byte data alignment conflicts with %s"), | |
6836 | // name); | |
6837 | } | |
6838 | // Fall through. | |
6839 | case elfcpp::Tag_ABI_FP_denormal: | |
6840 | case elfcpp::Tag_ABI_PCS_GOT_use: | |
6841 | { | |
6842 | // These tags have 0 = don't care, 1 = strong requirement, | |
6843 | // 2 = weak requirement. | |
6844 | static const int order_021[3] = {0, 2, 1}; | |
6845 | ||
6846 | // Use the "greatest" from the sequence 0, 2, 1, or the largest | |
6847 | // value if greater than 2 (for future-proofing). | |
6848 | if ((in_attr[i].int_value() > 2 | |
6849 | && in_attr[i].int_value() > out_attr[i].int_value()) | |
6850 | || (in_attr[i].int_value() <= 2 | |
6851 | && out_attr[i].int_value() <= 2 | |
6852 | && (order_021[in_attr[i].int_value()] | |
6853 | > order_021[out_attr[i].int_value()]))) | |
6854 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6855 | } | |
6856 | break; | |
6857 | ||
6858 | case elfcpp::Tag_CPU_arch_profile: | |
6859 | if (out_attr[i].int_value() != in_attr[i].int_value()) | |
6860 | { | |
6861 | // 0 will merge with anything. | |
6862 | // 'A' and 'S' merge to 'A'. | |
6863 | // 'R' and 'S' merge to 'R'. | |
6864 | // 'M' and 'A|R|S' is an error. | |
6865 | if (out_attr[i].int_value() == 0 | |
6866 | || (out_attr[i].int_value() == 'S' | |
6867 | && (in_attr[i].int_value() == 'A' | |
6868 | || in_attr[i].int_value() == 'R'))) | |
6869 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6870 | else if (in_attr[i].int_value() == 0 | |
6871 | || (in_attr[i].int_value() == 'S' | |
6872 | && (out_attr[i].int_value() == 'A' | |
6873 | || out_attr[i].int_value() == 'R'))) | |
6874 | ; // Do nothing. | |
6875 | else | |
6876 | { | |
6877 | gold_error | |
6878 | (_("conflicting architecture profiles %c/%c"), | |
6879 | in_attr[i].int_value() ? in_attr[i].int_value() : '0', | |
6880 | out_attr[i].int_value() ? out_attr[i].int_value() : '0'); | |
6881 | } | |
6882 | } | |
6883 | break; | |
6884 | case elfcpp::Tag_VFP_arch: | |
6885 | { | |
6886 | static const struct | |
6887 | { | |
6888 | int ver; | |
6889 | int regs; | |
6890 | } vfp_versions[7] = | |
6891 | { | |
6892 | {0, 0}, | |
6893 | {1, 16}, | |
6894 | {2, 16}, | |
6895 | {3, 32}, | |
6896 | {3, 16}, | |
6897 | {4, 32}, | |
6898 | {4, 16} | |
6899 | }; | |
6900 | ||
6901 | // Values greater than 6 aren't defined, so just pick the | |
6902 | // biggest. | |
6903 | if (in_attr[i].int_value() > 6 | |
6904 | && in_attr[i].int_value() > out_attr[i].int_value()) | |
6905 | { | |
6906 | *out_attr = *in_attr; | |
6907 | break; | |
6908 | } | |
6909 | // The output uses the superset of input features | |
6910 | // (ISA version) and registers. | |
6911 | int ver = std::max(vfp_versions[in_attr[i].int_value()].ver, | |
6912 | vfp_versions[out_attr[i].int_value()].ver); | |
6913 | int regs = std::max(vfp_versions[in_attr[i].int_value()].regs, | |
6914 | vfp_versions[out_attr[i].int_value()].regs); | |
6915 | // This assumes all possible supersets are also a valid | |
6916 | // options. | |
6917 | int newval; | |
6918 | for (newval = 6; newval > 0; newval--) | |
6919 | { | |
6920 | if (regs == vfp_versions[newval].regs | |
6921 | && ver == vfp_versions[newval].ver) | |
6922 | break; | |
6923 | } | |
6924 | out_attr[i].set_int_value(newval); | |
6925 | } | |
6926 | break; | |
6927 | case elfcpp::Tag_PCS_config: | |
6928 | if (out_attr[i].int_value() == 0) | |
6929 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6930 | else if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) | |
6931 | { | |
6932 | // It's sometimes ok to mix different configs, so this is only | |
6933 | // a warning. | |
6934 | gold_warning(_("%s: conflicting platform configuration"), name); | |
6935 | } | |
6936 | break; | |
6937 | case elfcpp::Tag_ABI_PCS_R9_use: | |
6938 | if (in_attr[i].int_value() != out_attr[i].int_value() | |
6939 | && out_attr[i].int_value() != elfcpp::AEABI_R9_unused | |
6940 | && in_attr[i].int_value() != elfcpp::AEABI_R9_unused) | |
6941 | { | |
6942 | gold_error(_("%s: conflicting use of R9"), name); | |
6943 | } | |
6944 | if (out_attr[i].int_value() == elfcpp::AEABI_R9_unused) | |
6945 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6946 | break; | |
6947 | case elfcpp::Tag_ABI_PCS_RW_data: | |
6948 | if (in_attr[i].int_value() == elfcpp::AEABI_PCS_RW_data_SBrel | |
6949 | && (in_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() | |
6950 | != elfcpp::AEABI_R9_SB) | |
6951 | && (out_attr[elfcpp::Tag_ABI_PCS_R9_use].int_value() | |
6952 | != elfcpp::AEABI_R9_unused)) | |
6953 | { | |
6954 | gold_error(_("%s: SB relative addressing conflicts with use " | |
6955 | "of R9"), | |
6956 | name); | |
6957 | } | |
6958 | // Use the smallest value specified. | |
6959 | if (in_attr[i].int_value() < out_attr[i].int_value()) | |
6960 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6961 | break; | |
6962 | case elfcpp::Tag_ABI_PCS_wchar_t: | |
6963 | // FIXME: Make it possible to turn off this warning. | |
6964 | if (out_attr[i].int_value() | |
6965 | && in_attr[i].int_value() | |
6966 | && out_attr[i].int_value() != in_attr[i].int_value()) | |
6967 | { | |
6968 | gold_warning(_("%s uses %u-byte wchar_t yet the output is to " | |
6969 | "use %u-byte wchar_t; use of wchar_t values " | |
6970 | "across objects may fail"), | |
6971 | name, in_attr[i].int_value(), | |
6972 | out_attr[i].int_value()); | |
6973 | } | |
6974 | else if (in_attr[i].int_value() && !out_attr[i].int_value()) | |
6975 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6976 | break; | |
6977 | case elfcpp::Tag_ABI_enum_size: | |
6978 | if (in_attr[i].int_value() != elfcpp::AEABI_enum_unused) | |
6979 | { | |
6980 | if (out_attr[i].int_value() == elfcpp::AEABI_enum_unused | |
6981 | || out_attr[i].int_value() == elfcpp::AEABI_enum_forced_wide) | |
6982 | { | |
6983 | // The existing object is compatible with anything. | |
6984 | // Use whatever requirements the new object has. | |
6985 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
6986 | } | |
6987 | // FIXME: Make it possible to turn off this warning. | |
6988 | else if (in_attr[i].int_value() != elfcpp::AEABI_enum_forced_wide | |
6989 | && out_attr[i].int_value() != in_attr[i].int_value()) | |
6990 | { | |
6991 | unsigned int in_value = in_attr[i].int_value(); | |
6992 | unsigned int out_value = out_attr[i].int_value(); | |
6993 | gold_warning(_("%s uses %s enums yet the output is to use " | |
6994 | "%s enums; use of enum values across objects " | |
6995 | "may fail"), | |
6996 | name, | |
6997 | this->aeabi_enum_name(in_value).c_str(), | |
6998 | this->aeabi_enum_name(out_value).c_str()); | |
6999 | } | |
7000 | } | |
7001 | break; | |
7002 | case elfcpp::Tag_ABI_VFP_args: | |
7003 | // Aready done. | |
7004 | break; | |
7005 | case elfcpp::Tag_ABI_WMMX_args: | |
7006 | if (in_attr[i].int_value() != out_attr[i].int_value()) | |
7007 | { | |
7008 | gold_error(_("%s uses iWMMXt register arguments, output does " | |
7009 | "not"), | |
7010 | name); | |
7011 | } | |
7012 | break; | |
7013 | case Object_attribute::Tag_compatibility: | |
7014 | // Merged in target-independent code. | |
7015 | break; | |
7016 | case elfcpp::Tag_ABI_HardFP_use: | |
7017 | // 1 (SP) and 2 (DP) conflict, so combine to 3 (SP & DP). | |
7018 | if ((in_attr[i].int_value() == 1 && out_attr[i].int_value() == 2) | |
7019 | || (in_attr[i].int_value() == 2 && out_attr[i].int_value() == 1)) | |
7020 | out_attr[i].set_int_value(3); | |
7021 | else if (in_attr[i].int_value() > out_attr[i].int_value()) | |
7022 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
7023 | break; | |
7024 | case elfcpp::Tag_ABI_FP_16bit_format: | |
7025 | if (in_attr[i].int_value() != 0 && out_attr[i].int_value() != 0) | |
7026 | { | |
7027 | if (in_attr[i].int_value() != out_attr[i].int_value()) | |
7028 | gold_error(_("fp16 format mismatch between %s and output"), | |
7029 | name); | |
7030 | } | |
7031 | if (in_attr[i].int_value() != 0) | |
7032 | out_attr[i].set_int_value(in_attr[i].int_value()); | |
7033 | break; | |
7034 | ||
7035 | case elfcpp::Tag_nodefaults: | |
7036 | // This tag is set if it exists, but the value is unused (and is | |
7037 | // typically zero). We don't actually need to do anything here - | |
7038 | // the merge happens automatically when the type flags are merged | |
7039 | // below. | |
7040 | break; | |
7041 | case elfcpp::Tag_also_compatible_with: | |
7042 | // Already done in Tag_CPU_arch. | |
7043 | break; | |
7044 | case elfcpp::Tag_conformance: | |
7045 | // Keep the attribute if it matches. Throw it away otherwise. | |
7046 | // No attribute means no claim to conform. | |
7047 | if (in_attr[i].string_value() != out_attr[i].string_value()) | |
7048 | out_attr[i].set_string_value(""); | |
7049 | break; | |
7050 | ||
7051 | default: | |
7052 | { | |
7053 | const char* err_object = NULL; | |
7054 | ||
7055 | // The "known_obj_attributes" table does contain some undefined | |
7056 | // attributes. Ensure that there are unused. | |
7057 | if (out_attr[i].int_value() != 0 | |
7058 | || out_attr[i].string_value() != "") | |
7059 | err_object = "output"; | |
7060 | else if (in_attr[i].int_value() != 0 | |
7061 | || in_attr[i].string_value() != "") | |
7062 | err_object = name; | |
7063 | ||
7064 | if (err_object != NULL) | |
7065 | { | |
7066 | // Attribute numbers >=64 (mod 128) can be safely ignored. | |
7067 | if ((i & 127) < 64) | |
7068 | gold_error(_("%s: unknown mandatory EABI object attribute " | |
7069 | "%d"), | |
7070 | err_object, i); | |
7071 | else | |
7072 | gold_warning(_("%s: unknown EABI object attribute %d"), | |
7073 | err_object, i); | |
7074 | } | |
7075 | ||
7076 | // Only pass on attributes that match in both inputs. | |
7077 | if (!in_attr[i].matches(out_attr[i])) | |
7078 | { | |
7079 | out_attr[i].set_int_value(0); | |
7080 | out_attr[i].set_string_value(""); | |
7081 | } | |
7082 | } | |
7083 | } | |
7084 | ||
7085 | // If out_attr was copied from in_attr then it won't have a type yet. | |
7086 | if (in_attr[i].type() && !out_attr[i].type()) | |
7087 | out_attr[i].set_type(in_attr[i].type()); | |
7088 | } | |
7089 | ||
7090 | // Merge Tag_compatibility attributes and any common GNU ones. | |
7091 | this->attributes_section_data_->merge(name, pasd); | |
7092 | ||
7093 | // Check for any attributes not known on ARM. | |
7094 | typedef Vendor_object_attributes::Other_attributes Other_attributes; | |
7095 | const Other_attributes* in_other_attributes = pasd->other_attributes(vendor); | |
7096 | Other_attributes::const_iterator in_iter = in_other_attributes->begin(); | |
7097 | Other_attributes* out_other_attributes = | |
7098 | this->attributes_section_data_->other_attributes(vendor); | |
7099 | Other_attributes::iterator out_iter = out_other_attributes->begin(); | |
7100 | ||
7101 | while (in_iter != in_other_attributes->end() | |
7102 | || out_iter != out_other_attributes->end()) | |
7103 | { | |
7104 | const char* err_object = NULL; | |
7105 | int err_tag = 0; | |
7106 | ||
7107 | // The tags for each list are in numerical order. | |
7108 | // If the tags are equal, then merge. | |
7109 | if (out_iter != out_other_attributes->end() | |
7110 | && (in_iter == in_other_attributes->end() | |
7111 | || in_iter->first > out_iter->first)) | |
7112 | { | |
7113 | // This attribute only exists in output. We can't merge, and we | |
7114 | // don't know what the tag means, so delete it. | |
7115 | err_object = "output"; | |
7116 | err_tag = out_iter->first; | |
7117 | int saved_tag = out_iter->first; | |
7118 | delete out_iter->second; | |
7119 | out_other_attributes->erase(out_iter); | |
7120 | out_iter = out_other_attributes->upper_bound(saved_tag); | |
7121 | } | |
7122 | else if (in_iter != in_other_attributes->end() | |
7123 | && (out_iter != out_other_attributes->end() | |
7124 | || in_iter->first < out_iter->first)) | |
7125 | { | |
7126 | // This attribute only exists in input. We can't merge, and we | |
7127 | // don't know what the tag means, so ignore it. | |
7128 | err_object = name; | |
7129 | err_tag = in_iter->first; | |
7130 | ++in_iter; | |
7131 | } | |
7132 | else // The tags are equal. | |
7133 | { | |
7134 | // As present, all attributes in the list are unknown, and | |
7135 | // therefore can't be merged meaningfully. | |
7136 | err_object = "output"; | |
7137 | err_tag = out_iter->first; | |
7138 | ||
7139 | // Only pass on attributes that match in both inputs. | |
7140 | if (!in_iter->second->matches(*(out_iter->second))) | |
7141 | { | |
7142 | // No match. Delete the attribute. | |
7143 | int saved_tag = out_iter->first; | |
7144 | delete out_iter->second; | |
7145 | out_other_attributes->erase(out_iter); | |
7146 | out_iter = out_other_attributes->upper_bound(saved_tag); | |
7147 | } | |
7148 | else | |
7149 | { | |
7150 | // Matched. Keep the attribute and move to the next. | |
7151 | ++out_iter; | |
7152 | ++in_iter; | |
7153 | } | |
7154 | } | |
7155 | ||
7156 | if (err_object) | |
7157 | { | |
7158 | // Attribute numbers >=64 (mod 128) can be safely ignored. */ | |
7159 | if ((err_tag & 127) < 64) | |
7160 | { | |
7161 | gold_error(_("%s: unknown mandatory EABI object attribute %d"), | |
7162 | err_object, err_tag); | |
7163 | } | |
7164 | else | |
7165 | { | |
7166 | gold_warning(_("%s: unknown EABI object attribute %d"), | |
7167 | err_object, err_tag); | |
7168 | } | |
7169 | } | |
7170 | } | |
7171 | } | |
7172 | ||
55da9579 DK |
7173 | // Return whether a relocation type used the LSB to distinguish THUMB |
7174 | // addresses. | |
7175 | template<bool big_endian> | |
7176 | bool | |
7177 | Target_arm<big_endian>::reloc_uses_thumb_bit(unsigned int r_type) | |
7178 | { | |
7179 | switch (r_type) | |
7180 | { | |
7181 | case elfcpp::R_ARM_PC24: | |
7182 | case elfcpp::R_ARM_ABS32: | |
7183 | case elfcpp::R_ARM_REL32: | |
7184 | case elfcpp::R_ARM_SBREL32: | |
7185 | case elfcpp::R_ARM_THM_CALL: | |
7186 | case elfcpp::R_ARM_GLOB_DAT: | |
7187 | case elfcpp::R_ARM_JUMP_SLOT: | |
7188 | case elfcpp::R_ARM_GOTOFF32: | |
7189 | case elfcpp::R_ARM_PLT32: | |
7190 | case elfcpp::R_ARM_CALL: | |
7191 | case elfcpp::R_ARM_JUMP24: | |
7192 | case elfcpp::R_ARM_THM_JUMP24: | |
7193 | case elfcpp::R_ARM_SBREL31: | |
7194 | case elfcpp::R_ARM_PREL31: | |
7195 | case elfcpp::R_ARM_MOVW_ABS_NC: | |
7196 | case elfcpp::R_ARM_MOVW_PREL_NC: | |
7197 | case elfcpp::R_ARM_THM_MOVW_ABS_NC: | |
7198 | case elfcpp::R_ARM_THM_MOVW_PREL_NC: | |
7199 | case elfcpp::R_ARM_THM_JUMP19: | |
7200 | case elfcpp::R_ARM_THM_ALU_PREL_11_0: | |
7201 | case elfcpp::R_ARM_ALU_PC_G0_NC: | |
7202 | case elfcpp::R_ARM_ALU_PC_G0: | |
7203 | case elfcpp::R_ARM_ALU_PC_G1_NC: | |
7204 | case elfcpp::R_ARM_ALU_PC_G1: | |
7205 | case elfcpp::R_ARM_ALU_PC_G2: | |
7206 | case elfcpp::R_ARM_ALU_SB_G0_NC: | |
7207 | case elfcpp::R_ARM_ALU_SB_G0: | |
7208 | case elfcpp::R_ARM_ALU_SB_G1_NC: | |
7209 | case elfcpp::R_ARM_ALU_SB_G1: | |
7210 | case elfcpp::R_ARM_ALU_SB_G2: | |
7211 | case elfcpp::R_ARM_MOVW_BREL_NC: | |
7212 | case elfcpp::R_ARM_MOVW_BREL: | |
7213 | case elfcpp::R_ARM_THM_MOVW_BREL_NC: | |
7214 | case elfcpp::R_ARM_THM_MOVW_BREL: | |
7215 | return true; | |
7216 | default: | |
7217 | return false; | |
7218 | } | |
7219 | } | |
7220 | ||
7221 | // Stub-generation methods for Target_arm. | |
7222 | ||
7223 | // Make a new Arm_input_section object. | |
7224 | ||
7225 | template<bool big_endian> | |
7226 | Arm_input_section<big_endian>* | |
7227 | Target_arm<big_endian>::new_arm_input_section( | |
2ea97941 ILT |
7228 | Relobj* relobj, |
7229 | unsigned int shndx) | |
55da9579 | 7230 | { |
2ea97941 | 7231 | Input_section_specifier iss(relobj, shndx); |
55da9579 DK |
7232 | |
7233 | Arm_input_section<big_endian>* arm_input_section = | |
2ea97941 | 7234 | new Arm_input_section<big_endian>(relobj, shndx); |
55da9579 DK |
7235 | arm_input_section->init(); |
7236 | ||
7237 | // Register new Arm_input_section in map for look-up. | |
7238 | std::pair<typename Arm_input_section_map::iterator, bool> ins = | |
7239 | this->arm_input_section_map_.insert(std::make_pair(iss, arm_input_section)); | |
7240 | ||
7241 | // Make sure that it we have not created another Arm_input_section | |
7242 | // for this input section already. | |
7243 | gold_assert(ins.second); | |
7244 | ||
7245 | return arm_input_section; | |
7246 | } | |
7247 | ||
7248 | // Find the Arm_input_section object corresponding to the SHNDX-th input | |
7249 | // section of RELOBJ. | |
7250 | ||
7251 | template<bool big_endian> | |
7252 | Arm_input_section<big_endian>* | |
7253 | Target_arm<big_endian>::find_arm_input_section( | |
2ea97941 ILT |
7254 | Relobj* relobj, |
7255 | unsigned int shndx) const | |
55da9579 | 7256 | { |
2ea97941 | 7257 | Input_section_specifier iss(relobj, shndx); |
55da9579 DK |
7258 | typename Arm_input_section_map::const_iterator p = |
7259 | this->arm_input_section_map_.find(iss); | |
7260 | return (p != this->arm_input_section_map_.end()) ? p->second : NULL; | |
7261 | } | |
7262 | ||
7263 | // Make a new stub table. | |
7264 | ||
7265 | template<bool big_endian> | |
7266 | Stub_table<big_endian>* | |
7267 | Target_arm<big_endian>::new_stub_table(Arm_input_section<big_endian>* owner) | |
7268 | { | |
2ea97941 | 7269 | Stub_table<big_endian>* stub_table = |
55da9579 | 7270 | new Stub_table<big_endian>(owner); |
2ea97941 | 7271 | this->stub_tables_.push_back(stub_table); |
55da9579 | 7272 | |
2ea97941 ILT |
7273 | stub_table->set_address(owner->address() + owner->data_size()); |
7274 | stub_table->set_file_offset(owner->offset() + owner->data_size()); | |
7275 | stub_table->finalize_data_size(); | |
55da9579 | 7276 | |
2ea97941 | 7277 | return stub_table; |
55da9579 DK |
7278 | } |
7279 | ||
eb44217c DK |
7280 | // Scan a relocation for stub generation. |
7281 | ||
7282 | template<bool big_endian> | |
7283 | void | |
7284 | Target_arm<big_endian>::scan_reloc_for_stub( | |
7285 | const Relocate_info<32, big_endian>* relinfo, | |
7286 | unsigned int r_type, | |
7287 | const Sized_symbol<32>* gsym, | |
7288 | unsigned int r_sym, | |
7289 | const Symbol_value<32>* psymval, | |
7290 | elfcpp::Elf_types<32>::Elf_Swxword addend, | |
7291 | Arm_address address) | |
7292 | { | |
2ea97941 | 7293 | typedef typename Target_arm<big_endian>::Relocate Relocate; |
eb44217c DK |
7294 | |
7295 | const Arm_relobj<big_endian>* arm_relobj = | |
7296 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
7297 | ||
7298 | bool target_is_thumb; | |
7299 | Symbol_value<32> symval; | |
7300 | if (gsym != NULL) | |
7301 | { | |
7302 | // This is a global symbol. Determine if we use PLT and if the | |
7303 | // final target is THUMB. | |
2ea97941 | 7304 | if (gsym->use_plt_offset(Relocate::reloc_is_non_pic(r_type))) |
eb44217c DK |
7305 | { |
7306 | // This uses a PLT, change the symbol value. | |
7307 | symval.set_output_value(this->plt_section()->address() | |
7308 | + gsym->plt_offset()); | |
7309 | psymval = &symval; | |
7310 | target_is_thumb = false; | |
7311 | } | |
7312 | else if (gsym->is_undefined()) | |
7313 | // There is no need to generate a stub symbol is undefined. | |
7314 | return; | |
7315 | else | |
7316 | { | |
7317 | target_is_thumb = | |
7318 | ((gsym->type() == elfcpp::STT_ARM_TFUNC) | |
7319 | || (gsym->type() == elfcpp::STT_FUNC | |
7320 | && !gsym->is_undefined() | |
7321 | && ((psymval->value(arm_relobj, 0) & 1) != 0))); | |
7322 | } | |
7323 | } | |
7324 | else | |
7325 | { | |
7326 | // This is a local symbol. Determine if the final target is THUMB. | |
7327 | target_is_thumb = arm_relobj->local_symbol_is_thumb_function(r_sym); | |
7328 | } | |
7329 | ||
7330 | // Strip LSB if this points to a THUMB target. | |
7331 | if (target_is_thumb | |
7332 | && Target_arm<big_endian>::reloc_uses_thumb_bit(r_type) | |
7333 | && ((psymval->value(arm_relobj, 0) & 1) != 0)) | |
7334 | { | |
7335 | Arm_address stripped_value = | |
7336 | psymval->value(arm_relobj, 0) & ~static_cast<Arm_address>(1); | |
7337 | symval.set_output_value(stripped_value); | |
7338 | psymval = &symval; | |
7339 | } | |
7340 | ||
7341 | // Get the symbol value. | |
7342 | Symbol_value<32>::Value value = psymval->value(arm_relobj, 0); | |
7343 | ||
7344 | // Owing to pipelining, the PC relative branches below actually skip | |
7345 | // two instructions when the branch offset is 0. | |
7346 | Arm_address destination; | |
7347 | switch (r_type) | |
7348 | { | |
7349 | case elfcpp::R_ARM_CALL: | |
7350 | case elfcpp::R_ARM_JUMP24: | |
7351 | case elfcpp::R_ARM_PLT32: | |
7352 | // ARM branches. | |
7353 | destination = value + addend + 8; | |
7354 | break; | |
7355 | case elfcpp::R_ARM_THM_CALL: | |
7356 | case elfcpp::R_ARM_THM_XPC22: | |
7357 | case elfcpp::R_ARM_THM_JUMP24: | |
7358 | case elfcpp::R_ARM_THM_JUMP19: | |
7359 | // THUMB branches. | |
7360 | destination = value + addend + 4; | |
7361 | break; | |
7362 | default: | |
7363 | gold_unreachable(); | |
7364 | } | |
7365 | ||
a120bc7f | 7366 | Reloc_stub* stub = NULL; |
eb44217c DK |
7367 | Stub_type stub_type = |
7368 | Reloc_stub::stub_type_for_reloc(r_type, address, destination, | |
7369 | target_is_thumb); | |
a120bc7f DK |
7370 | if (stub_type != arm_stub_none) |
7371 | { | |
7372 | // Try looking up an existing stub from a stub table. | |
7373 | Stub_table<big_endian>* stub_table = | |
7374 | arm_relobj->stub_table(relinfo->data_shndx); | |
7375 | gold_assert(stub_table != NULL); | |
eb44217c | 7376 | |
a120bc7f DK |
7377 | // Locate stub by destination. |
7378 | Reloc_stub::Key stub_key(stub_type, gsym, arm_relobj, r_sym, addend); | |
eb44217c | 7379 | |
a120bc7f DK |
7380 | // Create a stub if there is not one already |
7381 | stub = stub_table->find_reloc_stub(stub_key); | |
7382 | if (stub == NULL) | |
7383 | { | |
7384 | // create a new stub and add it to stub table. | |
7385 | stub = this->stub_factory().make_reloc_stub(stub_type); | |
7386 | stub_table->add_reloc_stub(stub, stub_key); | |
7387 | } | |
7388 | ||
7389 | // Record the destination address. | |
7390 | stub->set_destination_address(destination | |
7391 | | (target_is_thumb ? 1 : 0)); | |
eb44217c DK |
7392 | } |
7393 | ||
a120bc7f DK |
7394 | // For Cortex-A8, we need to record a relocation at 4K page boundary. |
7395 | if (this->fix_cortex_a8_ | |
7396 | && (r_type == elfcpp::R_ARM_THM_JUMP24 | |
7397 | || r_type == elfcpp::R_ARM_THM_JUMP19 | |
7398 | || r_type == elfcpp::R_ARM_THM_CALL | |
7399 | || r_type == elfcpp::R_ARM_THM_XPC22) | |
7400 | && (address & 0xfffU) == 0xffeU) | |
7401 | { | |
7402 | // Found a candidate. Note we haven't checked the destination is | |
7403 | // within 4K here: if we do so (and don't create a record) we can't | |
7404 | // tell that a branch should have been relocated when scanning later. | |
7405 | this->cortex_a8_relocs_info_[address] = | |
7406 | new Cortex_a8_reloc(stub, r_type, | |
7407 | destination | (target_is_thumb ? 1 : 0)); | |
7408 | } | |
eb44217c DK |
7409 | } |
7410 | ||
7411 | // This function scans a relocation sections for stub generation. | |
7412 | // The template parameter Relocate must be a class type which provides | |
7413 | // a single function, relocate(), which implements the machine | |
7414 | // specific part of a relocation. | |
7415 | ||
7416 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: | |
7417 | // SHT_REL or SHT_RELA. | |
7418 | ||
7419 | // PRELOCS points to the relocation data. RELOC_COUNT is the number | |
7420 | // of relocs. OUTPUT_SECTION is the output section. | |
7421 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be | |
7422 | // mapped to output offsets. | |
7423 | ||
7424 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and | |
7425 | // VIEW_SIZE is the size. These refer to the input section, unless | |
7426 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to | |
7427 | // the output section. | |
7428 | ||
7429 | template<bool big_endian> | |
7430 | template<int sh_type> | |
7431 | void inline | |
7432 | Target_arm<big_endian>::scan_reloc_section_for_stubs( | |
7433 | const Relocate_info<32, big_endian>* relinfo, | |
7434 | const unsigned char* prelocs, | |
7435 | size_t reloc_count, | |
7436 | Output_section* output_section, | |
7437 | bool needs_special_offset_handling, | |
7438 | const unsigned char* view, | |
7439 | elfcpp::Elf_types<32>::Elf_Addr view_address, | |
7440 | section_size_type) | |
7441 | { | |
7442 | typedef typename Reloc_types<sh_type, 32, big_endian>::Reloc Reltype; | |
7443 | const int reloc_size = | |
7444 | Reloc_types<sh_type, 32, big_endian>::reloc_size; | |
7445 | ||
7446 | Arm_relobj<big_endian>* arm_object = | |
7447 | Arm_relobj<big_endian>::as_arm_relobj(relinfo->object); | |
7448 | unsigned int local_count = arm_object->local_symbol_count(); | |
7449 | ||
7450 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; | |
7451 | ||
7452 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
7453 | { | |
7454 | Reltype reloc(prelocs); | |
7455 | ||
7456 | typename elfcpp::Elf_types<32>::Elf_WXword r_info = reloc.get_r_info(); | |
7457 | unsigned int r_sym = elfcpp::elf_r_sym<32>(r_info); | |
7458 | unsigned int r_type = elfcpp::elf_r_type<32>(r_info); | |
7459 | ||
7460 | r_type = this->get_real_reloc_type(r_type); | |
7461 | ||
7462 | // Only a few relocation types need stubs. | |
7463 | if ((r_type != elfcpp::R_ARM_CALL) | |
7464 | && (r_type != elfcpp::R_ARM_JUMP24) | |
7465 | && (r_type != elfcpp::R_ARM_PLT32) | |
7466 | && (r_type != elfcpp::R_ARM_THM_CALL) | |
7467 | && (r_type != elfcpp::R_ARM_THM_XPC22) | |
7468 | && (r_type != elfcpp::R_ARM_THM_JUMP24) | |
7469 | && (r_type != elfcpp::R_ARM_THM_JUMP19)) | |
7470 | continue; | |
7471 | ||
2ea97941 | 7472 | section_offset_type offset = |
eb44217c DK |
7473 | convert_to_section_size_type(reloc.get_r_offset()); |
7474 | ||
7475 | if (needs_special_offset_handling) | |
7476 | { | |
2ea97941 ILT |
7477 | offset = output_section->output_offset(relinfo->object, |
7478 | relinfo->data_shndx, | |
7479 | offset); | |
7480 | if (offset == -1) | |
eb44217c DK |
7481 | continue; |
7482 | } | |
7483 | ||
7484 | // Get the addend. | |
7485 | Stub_addend_reader<sh_type, big_endian> stub_addend_reader; | |
7486 | elfcpp::Elf_types<32>::Elf_Swxword addend = | |
2ea97941 | 7487 | stub_addend_reader(r_type, view + offset, reloc); |
eb44217c DK |
7488 | |
7489 | const Sized_symbol<32>* sym; | |
7490 | ||
7491 | Symbol_value<32> symval; | |
7492 | const Symbol_value<32> *psymval; | |
7493 | if (r_sym < local_count) | |
7494 | { | |
7495 | sym = NULL; | |
7496 | psymval = arm_object->local_symbol(r_sym); | |
7497 | ||
7498 | // If the local symbol belongs to a section we are discarding, | |
7499 | // and that section is a debug section, try to find the | |
7500 | // corresponding kept section and map this symbol to its | |
7501 | // counterpart in the kept section. The symbol must not | |
7502 | // correspond to a section we are folding. | |
7503 | bool is_ordinary; | |
2ea97941 | 7504 | unsigned int shndx = psymval->input_shndx(&is_ordinary); |
eb44217c | 7505 | if (is_ordinary |
2ea97941 ILT |
7506 | && shndx != elfcpp::SHN_UNDEF |
7507 | && !arm_object->is_section_included(shndx) | |
7508 | && !(relinfo->symtab->is_section_folded(arm_object, shndx))) | |
eb44217c DK |
7509 | { |
7510 | if (comdat_behavior == CB_UNDETERMINED) | |
7511 | { | |
7512 | std::string name = | |
7513 | arm_object->section_name(relinfo->data_shndx); | |
7514 | comdat_behavior = get_comdat_behavior(name.c_str()); | |
7515 | } | |
7516 | if (comdat_behavior == CB_PRETEND) | |
7517 | { | |
7518 | bool found; | |
7519 | typename elfcpp::Elf_types<32>::Elf_Addr value = | |
2ea97941 | 7520 | arm_object->map_to_kept_section(shndx, &found); |
eb44217c DK |
7521 | if (found) |
7522 | symval.set_output_value(value + psymval->input_value()); | |
7523 | else | |
7524 | symval.set_output_value(0); | |
7525 | } | |
7526 | else | |
7527 | { | |
7528 | symval.set_output_value(0); | |
7529 | } | |
7530 | symval.set_no_output_symtab_entry(); | |
7531 | psymval = &symval; | |
7532 | } | |
7533 | } | |
7534 | else | |
7535 | { | |
7536 | const Symbol* gsym = arm_object->global_symbol(r_sym); | |
7537 | gold_assert(gsym != NULL); | |
7538 | if (gsym->is_forwarder()) | |
7539 | gsym = relinfo->symtab->resolve_forwards(gsym); | |
7540 | ||
7541 | sym = static_cast<const Sized_symbol<32>*>(gsym); | |
7542 | if (sym->has_symtab_index()) | |
7543 | symval.set_output_symtab_index(sym->symtab_index()); | |
7544 | else | |
7545 | symval.set_no_output_symtab_entry(); | |
7546 | ||
7547 | // We need to compute the would-be final value of this global | |
7548 | // symbol. | |
7549 | const Symbol_table* symtab = relinfo->symtab; | |
7550 | const Sized_symbol<32>* sized_symbol = | |
7551 | symtab->get_sized_symbol<32>(gsym); | |
7552 | Symbol_table::Compute_final_value_status status; | |
7553 | Arm_address value = | |
7554 | symtab->compute_final_value<32>(sized_symbol, &status); | |
7555 | ||
7556 | // Skip this if the symbol has not output section. | |
7557 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) | |
7558 | continue; | |
7559 | ||
7560 | symval.set_output_value(value); | |
7561 | psymval = &symval; | |
7562 | } | |
7563 | ||
7564 | // If symbol is a section symbol, we don't know the actual type of | |
7565 | // destination. Give up. | |
7566 | if (psymval->is_section_symbol()) | |
7567 | continue; | |
7568 | ||
7569 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, | |
2ea97941 | 7570 | addend, view_address + offset); |
eb44217c DK |
7571 | } |
7572 | } | |
7573 | ||
7574 | // Scan an input section for stub generation. | |
7575 | ||
7576 | template<bool big_endian> | |
7577 | void | |
7578 | Target_arm<big_endian>::scan_section_for_stubs( | |
7579 | const Relocate_info<32, big_endian>* relinfo, | |
7580 | unsigned int sh_type, | |
7581 | const unsigned char* prelocs, | |
7582 | size_t reloc_count, | |
7583 | Output_section* output_section, | |
7584 | bool needs_special_offset_handling, | |
7585 | const unsigned char* view, | |
7586 | Arm_address view_address, | |
7587 | section_size_type view_size) | |
7588 | { | |
7589 | if (sh_type == elfcpp::SHT_REL) | |
7590 | this->scan_reloc_section_for_stubs<elfcpp::SHT_REL>( | |
7591 | relinfo, | |
7592 | prelocs, | |
7593 | reloc_count, | |
7594 | output_section, | |
7595 | needs_special_offset_handling, | |
7596 | view, | |
7597 | view_address, | |
7598 | view_size); | |
7599 | else if (sh_type == elfcpp::SHT_RELA) | |
7600 | // We do not support RELA type relocations yet. This is provided for | |
7601 | // completeness. | |
7602 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( | |
7603 | relinfo, | |
7604 | prelocs, | |
7605 | reloc_count, | |
7606 | output_section, | |
7607 | needs_special_offset_handling, | |
7608 | view, | |
7609 | view_address, | |
7610 | view_size); | |
7611 | else | |
7612 | gold_unreachable(); | |
7613 | } | |
7614 | ||
7615 | // Group input sections for stub generation. | |
7616 | // | |
7617 | // We goup input sections in an output sections so that the total size, | |
7618 | // including any padding space due to alignment is smaller than GROUP_SIZE | |
7619 | // unless the only input section in group is bigger than GROUP_SIZE already. | |
7620 | // Then an ARM stub table is created to follow the last input section | |
7621 | // in group. For each group an ARM stub table is created an is placed | |
7622 | // after the last group. If STUB_ALWATS_AFTER_BRANCH is false, we further | |
7623 | // extend the group after the stub table. | |
7624 | ||
7625 | template<bool big_endian> | |
7626 | void | |
7627 | Target_arm<big_endian>::group_sections( | |
2ea97941 | 7628 | Layout* layout, |
eb44217c DK |
7629 | section_size_type group_size, |
7630 | bool stubs_always_after_branch) | |
7631 | { | |
7632 | // Group input sections and insert stub table | |
7633 | Layout::Section_list section_list; | |
2ea97941 | 7634 | layout->get_allocated_sections(§ion_list); |
eb44217c DK |
7635 | for (Layout::Section_list::const_iterator p = section_list.begin(); |
7636 | p != section_list.end(); | |
7637 | ++p) | |
7638 | { | |
7639 | Arm_output_section<big_endian>* output_section = | |
7640 | Arm_output_section<big_endian>::as_arm_output_section(*p); | |
7641 | output_section->group_sections(group_size, stubs_always_after_branch, | |
7642 | this); | |
7643 | } | |
7644 | } | |
7645 | ||
7646 | // Relaxation hook. This is where we do stub generation. | |
7647 | ||
7648 | template<bool big_endian> | |
7649 | bool | |
7650 | Target_arm<big_endian>::do_relax( | |
7651 | int pass, | |
7652 | const Input_objects* input_objects, | |
7653 | Symbol_table* symtab, | |
2ea97941 | 7654 | Layout* layout) |
eb44217c DK |
7655 | { |
7656 | // No need to generate stubs if this is a relocatable link. | |
7657 | gold_assert(!parameters->options().relocatable()); | |
7658 | ||
7659 | // If this is the first pass, we need to group input sections into | |
7660 | // stub groups. | |
7661 | if (pass == 1) | |
7662 | { | |
7663 | // Determine the stub group size. The group size is the absolute | |
7664 | // value of the parameter --stub-group-size. If --stub-group-size | |
7665 | // is passed a negative value, we restict stubs to be always after | |
7666 | // the stubbed branches. | |
7667 | int32_t stub_group_size_param = | |
7668 | parameters->options().stub_group_size(); | |
7669 | bool stubs_always_after_branch = stub_group_size_param < 0; | |
7670 | section_size_type stub_group_size = abs(stub_group_size_param); | |
7671 | ||
44272192 DK |
7672 | // The Cortex-A8 erratum fix depends on stubs not being in the same 4K |
7673 | // page as the first half of a 32-bit branch straddling two 4K pages. | |
7674 | // This is a crude way of enforcing that. | |
7675 | if (this->fix_cortex_a8_) | |
7676 | stubs_always_after_branch = true; | |
7677 | ||
eb44217c DK |
7678 | if (stub_group_size == 1) |
7679 | { | |
7680 | // Default value. | |
7681 | // Thumb branch range is +-4MB has to be used as the default | |
7682 | // maximum size (a given section can contain both ARM and Thumb | |
7683 | // code, so the worst case has to be taken into account). | |
7684 | // | |
7685 | // This value is 24K less than that, which allows for 2025 | |
7686 | // 12-byte stubs. If we exceed that, then we will fail to link. | |
7687 | // The user will have to relink with an explicit group size | |
7688 | // option. | |
7689 | stub_group_size = 4170000; | |
7690 | } | |
7691 | ||
2ea97941 | 7692 | group_sections(layout, stub_group_size, stubs_always_after_branch); |
eb44217c DK |
7693 | } |
7694 | ||
44272192 DK |
7695 | // The Cortex-A8 stubs are sensitive to layout of code sections. At the |
7696 | // beginning of each relaxation pass, just blow away all the stubs. | |
7697 | // Alternatively, we could selectively remove only the stubs and reloc | |
7698 | // information for code sections that have moved since the last pass. | |
7699 | // That would require more book-keeping. | |
eb44217c | 7700 | typedef typename Stub_table_list::iterator Stub_table_iterator; |
a120bc7f DK |
7701 | if (this->fix_cortex_a8_) |
7702 | { | |
7703 | // Clear all Cortex-A8 reloc information. | |
7704 | for (typename Cortex_a8_relocs_info::const_iterator p = | |
7705 | this->cortex_a8_relocs_info_.begin(); | |
7706 | p != this->cortex_a8_relocs_info_.end(); | |
7707 | ++p) | |
7708 | delete p->second; | |
7709 | this->cortex_a8_relocs_info_.clear(); | |
44272192 DK |
7710 | |
7711 | // Remove all Cortex-A8 stubs. | |
7712 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
7713 | sp != this->stub_tables_.end(); | |
7714 | ++sp) | |
7715 | (*sp)->remove_all_cortex_a8_stubs(); | |
a120bc7f DK |
7716 | } |
7717 | ||
44272192 | 7718 | // Scan relocs for relocation stubs |
eb44217c DK |
7719 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); |
7720 | op != input_objects->relobj_end(); | |
7721 | ++op) | |
7722 | { | |
7723 | Arm_relobj<big_endian>* arm_relobj = | |
7724 | Arm_relobj<big_endian>::as_arm_relobj(*op); | |
2ea97941 | 7725 | arm_relobj->scan_sections_for_stubs(this, symtab, layout); |
eb44217c DK |
7726 | } |
7727 | ||
2fb7225c DK |
7728 | // Check all stub tables to see if any of them have their data sizes |
7729 | // or addresses alignments changed. These are the only things that | |
7730 | // matter. | |
eb44217c DK |
7731 | bool any_stub_table_changed = false; |
7732 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
7733 | (sp != this->stub_tables_.end()) && !any_stub_table_changed; | |
7734 | ++sp) | |
7735 | { | |
2fb7225c | 7736 | if ((*sp)->update_data_size_and_addralign()) |
eb44217c DK |
7737 | any_stub_table_changed = true; |
7738 | } | |
7739 | ||
2fb7225c DK |
7740 | // Finalize the stubs in the last relaxation pass. |
7741 | if (!any_stub_table_changed) | |
7742 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
7743 | (sp != this->stub_tables_.end()) && !any_stub_table_changed; | |
7744 | ++sp) | |
7745 | (*sp)->finalize_stubs(); | |
7746 | ||
eb44217c DK |
7747 | return any_stub_table_changed; |
7748 | } | |
7749 | ||
43d12afe DK |
7750 | // Relocate a stub. |
7751 | ||
7752 | template<bool big_endian> | |
7753 | void | |
7754 | Target_arm<big_endian>::relocate_stub( | |
2fb7225c | 7755 | Stub* stub, |
43d12afe DK |
7756 | const Relocate_info<32, big_endian>* relinfo, |
7757 | Output_section* output_section, | |
7758 | unsigned char* view, | |
7759 | Arm_address address, | |
7760 | section_size_type view_size) | |
7761 | { | |
7762 | Relocate relocate; | |
2ea97941 ILT |
7763 | const Stub_template* stub_template = stub->stub_template(); |
7764 | for (size_t i = 0; i < stub_template->reloc_count(); i++) | |
43d12afe | 7765 | { |
2ea97941 ILT |
7766 | size_t reloc_insn_index = stub_template->reloc_insn_index(i); |
7767 | const Insn_template* insn = &stub_template->insns()[reloc_insn_index]; | |
43d12afe DK |
7768 | |
7769 | unsigned int r_type = insn->r_type(); | |
2ea97941 | 7770 | section_size_type reloc_offset = stub_template->reloc_offset(i); |
43d12afe DK |
7771 | section_size_type reloc_size = insn->size(); |
7772 | gold_assert(reloc_offset + reloc_size <= view_size); | |
7773 | ||
7774 | // This is the address of the stub destination. | |
41263c05 | 7775 | Arm_address target = stub->reloc_target(i) + insn->reloc_addend(); |
43d12afe DK |
7776 | Symbol_value<32> symval; |
7777 | symval.set_output_value(target); | |
7778 | ||
7779 | // Synthesize a fake reloc just in case. We don't have a symbol so | |
7780 | // we use 0. | |
7781 | unsigned char reloc_buffer[elfcpp::Elf_sizes<32>::rel_size]; | |
7782 | memset(reloc_buffer, 0, sizeof(reloc_buffer)); | |
7783 | elfcpp::Rel_write<32, big_endian> reloc_write(reloc_buffer); | |
7784 | reloc_write.put_r_offset(reloc_offset); | |
7785 | reloc_write.put_r_info(elfcpp::elf_r_info<32>(0, r_type)); | |
7786 | elfcpp::Rel<32, big_endian> rel(reloc_buffer); | |
7787 | ||
7788 | relocate.relocate(relinfo, this, output_section, | |
7789 | this->fake_relnum_for_stubs, rel, r_type, | |
7790 | NULL, &symval, view + reloc_offset, | |
7791 | address + reloc_offset, reloc_size); | |
7792 | } | |
7793 | } | |
7794 | ||
a0351a69 DK |
7795 | // Determine whether an object attribute tag takes an integer, a |
7796 | // string or both. | |
7797 | ||
7798 | template<bool big_endian> | |
7799 | int | |
7800 | Target_arm<big_endian>::do_attribute_arg_type(int tag) const | |
7801 | { | |
7802 | if (tag == Object_attribute::Tag_compatibility) | |
7803 | return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL | |
7804 | | Object_attribute::ATTR_TYPE_FLAG_STR_VAL); | |
7805 | else if (tag == elfcpp::Tag_nodefaults) | |
7806 | return (Object_attribute::ATTR_TYPE_FLAG_INT_VAL | |
7807 | | Object_attribute::ATTR_TYPE_FLAG_NO_DEFAULT); | |
7808 | else if (tag == elfcpp::Tag_CPU_raw_name || tag == elfcpp::Tag_CPU_name) | |
7809 | return Object_attribute::ATTR_TYPE_FLAG_STR_VAL; | |
7810 | else if (tag < 32) | |
7811 | return Object_attribute::ATTR_TYPE_FLAG_INT_VAL; | |
7812 | else | |
7813 | return ((tag & 1) != 0 | |
7814 | ? Object_attribute::ATTR_TYPE_FLAG_STR_VAL | |
7815 | : Object_attribute::ATTR_TYPE_FLAG_INT_VAL); | |
7816 | } | |
7817 | ||
7818 | // Reorder attributes. | |
7819 | // | |
7820 | // The ABI defines that Tag_conformance should be emitted first, and that | |
7821 | // Tag_nodefaults should be second (if either is defined). This sets those | |
7822 | // two positions, and bumps up the position of all the remaining tags to | |
7823 | // compensate. | |
7824 | ||
7825 | template<bool big_endian> | |
7826 | int | |
7827 | Target_arm<big_endian>::do_attributes_order(int num) const | |
7828 | { | |
7829 | // Reorder the known object attributes in output. We want to move | |
7830 | // Tag_conformance to position 4 and Tag_conformance to position 5 | |
7831 | // and shift eveything between 4 .. Tag_conformance - 1 to make room. | |
7832 | if (num == 4) | |
7833 | return elfcpp::Tag_conformance; | |
7834 | if (num == 5) | |
7835 | return elfcpp::Tag_nodefaults; | |
7836 | if ((num - 2) < elfcpp::Tag_nodefaults) | |
7837 | return num - 2; | |
7838 | if ((num - 1) < elfcpp::Tag_conformance) | |
7839 | return num - 1; | |
7840 | return num; | |
7841 | } | |
4a657b0d | 7842 | |
44272192 DK |
7843 | // Scan a span of THUMB code for Cortex-A8 erratum. |
7844 | ||
7845 | template<bool big_endian> | |
7846 | void | |
7847 | Target_arm<big_endian>::scan_span_for_cortex_a8_erratum( | |
7848 | Arm_relobj<big_endian>* arm_relobj, | |
7849 | unsigned int shndx, | |
7850 | section_size_type span_start, | |
7851 | section_size_type span_end, | |
7852 | const unsigned char* view, | |
7853 | Arm_address address) | |
7854 | { | |
7855 | // Scan for 32-bit Thumb-2 branches which span two 4K regions, where: | |
7856 | // | |
7857 | // The opcode is BLX.W, BL.W, B.W, Bcc.W | |
7858 | // The branch target is in the same 4KB region as the | |
7859 | // first half of the branch. | |
7860 | // The instruction before the branch is a 32-bit | |
7861 | // length non-branch instruction. | |
7862 | section_size_type i = span_start; | |
7863 | bool last_was_32bit = false; | |
7864 | bool last_was_branch = false; | |
7865 | while (i < span_end) | |
7866 | { | |
7867 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
7868 | const Valtype* wv = reinterpret_cast<const Valtype*>(view + i); | |
7869 | uint32_t insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
7870 | bool is_blx = false, is_b = false; | |
7871 | bool is_bl = false, is_bcc = false; | |
7872 | ||
7873 | bool insn_32bit = (insn & 0xe000) == 0xe000 && (insn & 0x1800) != 0x0000; | |
7874 | if (insn_32bit) | |
7875 | { | |
7876 | // Load the rest of the insn (in manual-friendly order). | |
7877 | insn = (insn << 16) | elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
7878 | ||
7879 | // Encoding T4: B<c>.W. | |
7880 | is_b = (insn & 0xf800d000U) == 0xf0009000U; | |
7881 | // Encoding T1: BL<c>.W. | |
7882 | is_bl = (insn & 0xf800d000U) == 0xf000d000U; | |
7883 | // Encoding T2: BLX<c>.W. | |
7884 | is_blx = (insn & 0xf800d000U) == 0xf000c000U; | |
7885 | // Encoding T3: B<c>.W (not permitted in IT block). | |
7886 | is_bcc = ((insn & 0xf800d000U) == 0xf0008000U | |
7887 | && (insn & 0x07f00000U) != 0x03800000U); | |
7888 | } | |
7889 | ||
7890 | bool is_32bit_branch = is_b || is_bl || is_blx || is_bcc; | |
7891 | ||
7892 | // If this instruction is a 32-bit THUMB branch that crosses a 4K | |
7893 | // page boundary and it follows 32-bit non-branch instruction, | |
7894 | // we need to work around. | |
7895 | if (is_32bit_branch | |
7896 | && ((address + i) & 0xfffU) == 0xffeU | |
7897 | && last_was_32bit | |
7898 | && !last_was_branch) | |
7899 | { | |
7900 | // Check to see if there is a relocation stub for this branch. | |
7901 | bool force_target_arm = false; | |
7902 | bool force_target_thumb = false; | |
7903 | const Cortex_a8_reloc* cortex_a8_reloc = NULL; | |
7904 | Cortex_a8_relocs_info::const_iterator p = | |
7905 | this->cortex_a8_relocs_info_.find(address + i); | |
7906 | ||
7907 | if (p != this->cortex_a8_relocs_info_.end()) | |
7908 | { | |
7909 | cortex_a8_reloc = p->second; | |
7910 | bool target_is_thumb = (cortex_a8_reloc->destination() & 1) != 0; | |
7911 | ||
7912 | if (cortex_a8_reloc->r_type() == elfcpp::R_ARM_THM_CALL | |
7913 | && !target_is_thumb) | |
7914 | force_target_arm = true; | |
7915 | else if (cortex_a8_reloc->r_type() == elfcpp::R_ARM_THM_CALL | |
7916 | && target_is_thumb) | |
7917 | force_target_thumb = true; | |
7918 | } | |
7919 | ||
7920 | off_t offset; | |
7921 | Stub_type stub_type = arm_stub_none; | |
7922 | ||
7923 | // Check if we have an offending branch instruction. | |
7924 | uint16_t upper_insn = (insn >> 16) & 0xffffU; | |
7925 | uint16_t lower_insn = insn & 0xffffU; | |
7926 | typedef struct Arm_relocate_functions<big_endian> RelocFuncs; | |
7927 | ||
7928 | if (cortex_a8_reloc != NULL | |
7929 | && cortex_a8_reloc->reloc_stub() != NULL) | |
7930 | // We've already made a stub for this instruction, e.g. | |
7931 | // it's a long branch or a Thumb->ARM stub. Assume that | |
7932 | // stub will suffice to work around the A8 erratum (see | |
7933 | // setting of always_after_branch above). | |
7934 | ; | |
7935 | else if (is_bcc) | |
7936 | { | |
7937 | offset = RelocFuncs::thumb32_cond_branch_offset(upper_insn, | |
7938 | lower_insn); | |
7939 | stub_type = arm_stub_a8_veneer_b_cond; | |
7940 | } | |
7941 | else if (is_b || is_bl || is_blx) | |
7942 | { | |
7943 | offset = RelocFuncs::thumb32_branch_offset(upper_insn, | |
7944 | lower_insn); | |
7945 | if (is_blx) | |
7946 | offset &= ~3; | |
7947 | ||
7948 | stub_type = (is_blx | |
7949 | ? arm_stub_a8_veneer_blx | |
7950 | : (is_bl | |
7951 | ? arm_stub_a8_veneer_bl | |
7952 | : arm_stub_a8_veneer_b)); | |
7953 | } | |
7954 | ||
7955 | if (stub_type != arm_stub_none) | |
7956 | { | |
7957 | Arm_address pc_for_insn = address + i + 4; | |
7958 | ||
7959 | // The original instruction is a BL, but the target is | |
7960 | // an ARM instruction. If we were not making a stub, | |
7961 | // the BL would have been converted to a BLX. Use the | |
7962 | // BLX stub instead in that case. | |
7963 | if (this->may_use_blx() && force_target_arm | |
7964 | && stub_type == arm_stub_a8_veneer_bl) | |
7965 | { | |
7966 | stub_type = arm_stub_a8_veneer_blx; | |
7967 | is_blx = true; | |
7968 | is_bl = false; | |
7969 | } | |
7970 | // Conversely, if the original instruction was | |
7971 | // BLX but the target is Thumb mode, use the BL stub. | |
7972 | else if (force_target_thumb | |
7973 | && stub_type == arm_stub_a8_veneer_blx) | |
7974 | { | |
7975 | stub_type = arm_stub_a8_veneer_bl; | |
7976 | is_blx = false; | |
7977 | is_bl = true; | |
7978 | } | |
7979 | ||
7980 | if (is_blx) | |
7981 | pc_for_insn &= ~3; | |
7982 | ||
7983 | // If we found a relocation, use the proper destination, | |
7984 | // not the offset in the (unrelocated) instruction. | |
7985 | // Note this is always done if we switched the stub type above. | |
7986 | if (cortex_a8_reloc != NULL) | |
7987 | offset = (off_t) (cortex_a8_reloc->destination() - pc_for_insn); | |
7988 | ||
7989 | Arm_address target = (pc_for_insn + offset) | (is_blx ? 0 : 1); | |
7990 | ||
7991 | // Add a new stub if destination address in in the same page. | |
7992 | if (((address + i) & ~0xfffU) == (target & ~0xfffU)) | |
7993 | { | |
7994 | Cortex_a8_stub* stub = | |
7995 | this->stub_factory_.make_cortex_a8_stub(stub_type, | |
7996 | arm_relobj, shndx, | |
7997 | address + i, | |
7998 | target, insn); | |
7999 | Stub_table<big_endian>* stub_table = | |
8000 | arm_relobj->stub_table(shndx); | |
8001 | gold_assert(stub_table != NULL); | |
8002 | stub_table->add_cortex_a8_stub(address + i, stub); | |
8003 | } | |
8004 | } | |
8005 | } | |
8006 | ||
8007 | i += insn_32bit ? 4 : 2; | |
8008 | last_was_32bit = insn_32bit; | |
8009 | last_was_branch = is_32bit_branch; | |
8010 | } | |
8011 | } | |
8012 | ||
41263c05 DK |
8013 | // Apply the Cortex-A8 workaround. |
8014 | ||
8015 | template<bool big_endian> | |
8016 | void | |
8017 | Target_arm<big_endian>::apply_cortex_a8_workaround( | |
8018 | const Cortex_a8_stub* stub, | |
8019 | Arm_address stub_address, | |
8020 | unsigned char* insn_view, | |
8021 | Arm_address insn_address) | |
8022 | { | |
8023 | typedef typename elfcpp::Swap<16, big_endian>::Valtype Valtype; | |
8024 | Valtype* wv = reinterpret_cast<Valtype*>(insn_view); | |
8025 | Valtype upper_insn = elfcpp::Swap<16, big_endian>::readval(wv); | |
8026 | Valtype lower_insn = elfcpp::Swap<16, big_endian>::readval(wv + 1); | |
8027 | off_t branch_offset = stub_address - (insn_address + 4); | |
8028 | ||
8029 | typedef struct Arm_relocate_functions<big_endian> RelocFuncs; | |
8030 | switch (stub->stub_template()->type()) | |
8031 | { | |
8032 | case arm_stub_a8_veneer_b_cond: | |
8033 | gold_assert(!utils::has_overflow<21>(branch_offset)); | |
8034 | upper_insn = RelocFuncs::thumb32_cond_branch_upper(upper_insn, | |
8035 | branch_offset); | |
8036 | lower_insn = RelocFuncs::thumb32_cond_branch_lower(lower_insn, | |
8037 | branch_offset); | |
8038 | break; | |
8039 | ||
8040 | case arm_stub_a8_veneer_b: | |
8041 | case arm_stub_a8_veneer_bl: | |
8042 | case arm_stub_a8_veneer_blx: | |
8043 | if ((lower_insn & 0x5000U) == 0x4000U) | |
8044 | // For a BLX instruction, make sure that the relocation is | |
8045 | // rounded up to a word boundary. This follows the semantics of | |
8046 | // the instruction which specifies that bit 1 of the target | |
8047 | // address will come from bit 1 of the base address. | |
8048 | branch_offset = (branch_offset + 2) & ~3; | |
8049 | ||
8050 | // Put BRANCH_OFFSET back into the insn. | |
8051 | gold_assert(!utils::has_overflow<25>(branch_offset)); | |
8052 | upper_insn = RelocFuncs::thumb32_branch_upper(upper_insn, branch_offset); | |
8053 | lower_insn = RelocFuncs::thumb32_branch_lower(lower_insn, branch_offset); | |
8054 | break; | |
8055 | ||
8056 | default: | |
8057 | gold_unreachable(); | |
8058 | } | |
8059 | ||
8060 | // Put the relocated value back in the object file: | |
8061 | elfcpp::Swap<16, big_endian>::writeval(wv, upper_insn); | |
8062 | elfcpp::Swap<16, big_endian>::writeval(wv + 1, lower_insn); | |
8063 | } | |
8064 | ||
4a657b0d DK |
8065 | template<bool big_endian> |
8066 | class Target_selector_arm : public Target_selector | |
8067 | { | |
8068 | public: | |
8069 | Target_selector_arm() | |
8070 | : Target_selector(elfcpp::EM_ARM, 32, big_endian, | |
8071 | (big_endian ? "elf32-bigarm" : "elf32-littlearm")) | |
8072 | { } | |
8073 | ||
8074 | Target* | |
8075 | do_instantiate_target() | |
8076 | { return new Target_arm<big_endian>(); } | |
8077 | }; | |
8078 | ||
8079 | Target_selector_arm<false> target_selector_arm; | |
8080 | Target_selector_arm<true> target_selector_armbe; | |
8081 | ||
8082 | } // End anonymous namespace. |