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053a4d68 JY |
1 | // aarch64.cc -- aarch64 target support for gold. |
2 | ||
b90efa5b | 3 | // Copyright (C) 2014-2015 Free Software Foundation, Inc. |
9363c7c3 | 4 | // Written by Jing Yu <jingyu@google.com> and Han Shen <shenhan@google.com>. |
053a4d68 JY |
5 | |
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or modify | |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // This program is distributed in the hope that it will be useful, | |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
22 | ||
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
26 | ||
27 | #include "elfcpp.h" | |
28 | #include "dwarf.h" | |
29 | #include "parameters.h" | |
30 | #include "reloc.h" | |
31 | #include "aarch64.h" | |
32 | #include "object.h" | |
33 | #include "symtab.h" | |
34 | #include "layout.h" | |
35 | #include "output.h" | |
36 | #include "copy-relocs.h" | |
37 | #include "target.h" | |
38 | #include "target-reloc.h" | |
39 | #include "target-select.h" | |
40 | #include "tls.h" | |
41 | #include "freebsd.h" | |
42 | #include "nacl.h" | |
43 | #include "gc.h" | |
44 | #include "icf.h" | |
9363c7c3 | 45 | #include "aarch64-reloc-property.h" |
053a4d68 JY |
46 | |
47 | // The first three .got.plt entries are reserved. | |
48 | const int32_t AARCH64_GOTPLT_RESERVE_COUNT = 3; | |
49 | ||
83a01957 | 50 | |
053a4d68 JY |
51 | namespace |
52 | { | |
53 | ||
54 | using namespace gold; | |
55 | ||
56 | template<int size, bool big_endian> | |
57 | class Output_data_plt_aarch64; | |
58 | ||
59 | template<int size, bool big_endian> | |
60 | class Output_data_plt_aarch64_standard; | |
61 | ||
62 | template<int size, bool big_endian> | |
63 | class Target_aarch64; | |
64 | ||
9363c7c3 JY |
65 | template<int size, bool big_endian> |
66 | class AArch64_relocate_functions; | |
67 | ||
053a4d68 JY |
68 | // Output_data_got_aarch64 class. |
69 | ||
70 | template<int size, bool big_endian> | |
71 | class Output_data_got_aarch64 : public Output_data_got<size, big_endian> | |
72 | { | |
73 | public: | |
74 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Valtype; | |
75 | Output_data_got_aarch64(Symbol_table* symtab, Layout* layout) | |
9363c7c3 JY |
76 | : Output_data_got<size, big_endian>(), |
77 | symbol_table_(symtab), layout_(layout) | |
053a4d68 JY |
78 | { } |
79 | ||
8e33481e HS |
80 | // Add a static entry for the GOT entry at OFFSET. GSYM is a global |
81 | // symbol and R_TYPE is the code of a dynamic relocation that needs to be | |
82 | // applied in a static link. | |
83 | void | |
84 | add_static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) | |
85 | { this->static_relocs_.push_back(Static_reloc(got_offset, r_type, gsym)); } | |
86 | ||
87 | ||
88 | // Add a static reloc for the GOT entry at OFFSET. RELOBJ is an object | |
89 | // defining a local symbol with INDEX. R_TYPE is the code of a dynamic | |
90 | // relocation that needs to be applied in a static link. | |
91 | void | |
92 | add_static_reloc(unsigned int got_offset, unsigned int r_type, | |
93 | Sized_relobj_file<size, big_endian>* relobj, | |
94 | unsigned int index) | |
95 | { | |
96 | this->static_relocs_.push_back(Static_reloc(got_offset, r_type, relobj, | |
97 | index)); | |
98 | } | |
99 | ||
100 | ||
053a4d68 JY |
101 | protected: |
102 | // Write out the GOT table. | |
103 | void | |
104 | do_write(Output_file* of) { | |
105 | // The first entry in the GOT is the address of the .dynamic section. | |
106 | gold_assert(this->data_size() >= size / 8); | |
107 | Output_section* dynamic = this->layout_->dynamic_section(); | |
108 | Valtype dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
109 | this->replace_constant(0, dynamic_addr); | |
110 | Output_data_got<size, big_endian>::do_write(of); | |
8e33481e HS |
111 | |
112 | // Handling static relocs | |
113 | if (this->static_relocs_.empty()) | |
114 | return; | |
115 | ||
116 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
117 | ||
118 | gold_assert(parameters->doing_static_link()); | |
119 | const off_t offset = this->offset(); | |
120 | const section_size_type oview_size = | |
121 | convert_to_section_size_type(this->data_size()); | |
122 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
123 | ||
124 | Output_segment* tls_segment = this->layout_->tls_segment(); | |
125 | gold_assert(tls_segment != NULL); | |
126 | ||
127 | AArch64_address aligned_tcb_address = | |
83a01957 | 128 | align_address(Target_aarch64<size, big_endian>::TCB_SIZE, |
8e33481e HS |
129 | tls_segment->maximum_alignment()); |
130 | ||
131 | for (size_t i = 0; i < this->static_relocs_.size(); ++i) | |
132 | { | |
133 | Static_reloc& reloc(this->static_relocs_[i]); | |
134 | AArch64_address value; | |
135 | ||
136 | if (!reloc.symbol_is_global()) | |
137 | { | |
138 | Sized_relobj_file<size, big_endian>* object = reloc.relobj(); | |
139 | const Symbol_value<size>* psymval = | |
140 | reloc.relobj()->local_symbol(reloc.index()); | |
141 | ||
142 | // We are doing static linking. Issue an error and skip this | |
143 | // relocation if the symbol is undefined or in a discarded_section. | |
144 | bool is_ordinary; | |
145 | unsigned int shndx = psymval->input_shndx(&is_ordinary); | |
146 | if ((shndx == elfcpp::SHN_UNDEF) | |
147 | || (is_ordinary | |
148 | && shndx != elfcpp::SHN_UNDEF | |
149 | && !object->is_section_included(shndx) | |
150 | && !this->symbol_table_->is_section_folded(object, shndx))) | |
151 | { | |
152 | gold_error(_("undefined or discarded local symbol %u from " | |
153 | " object %s in GOT"), | |
154 | reloc.index(), reloc.relobj()->name().c_str()); | |
155 | continue; | |
156 | } | |
157 | value = psymval->value(object, 0); | |
158 | } | |
159 | else | |
160 | { | |
161 | const Symbol* gsym = reloc.symbol(); | |
162 | gold_assert(gsym != NULL); | |
163 | if (gsym->is_forwarder()) | |
164 | gsym = this->symbol_table_->resolve_forwards(gsym); | |
165 | ||
166 | // We are doing static linking. Issue an error and skip this | |
167 | // relocation if the symbol is undefined or in a discarded_section | |
168 | // unless it is a weakly_undefined symbol. | |
169 | if ((gsym->is_defined_in_discarded_section() | |
170 | || gsym->is_undefined()) | |
171 | && !gsym->is_weak_undefined()) | |
172 | { | |
173 | gold_error(_("undefined or discarded symbol %s in GOT"), | |
174 | gsym->name()); | |
175 | continue; | |
176 | } | |
177 | ||
178 | if (!gsym->is_weak_undefined()) | |
179 | { | |
180 | const Sized_symbol<size>* sym = | |
181 | static_cast<const Sized_symbol<size>*>(gsym); | |
182 | value = sym->value(); | |
183 | } | |
184 | else | |
185 | value = 0; | |
186 | } | |
187 | ||
188 | unsigned got_offset = reloc.got_offset(); | |
189 | gold_assert(got_offset < oview_size); | |
190 | ||
191 | typedef typename elfcpp::Swap<size, big_endian>::Valtype Valtype; | |
192 | Valtype* wv = reinterpret_cast<Valtype*>(oview + got_offset); | |
193 | Valtype x; | |
194 | switch (reloc.r_type()) | |
195 | { | |
196 | case elfcpp::R_AARCH64_TLS_DTPREL64: | |
197 | x = value; | |
198 | break; | |
199 | case elfcpp::R_AARCH64_TLS_TPREL64: | |
200 | x = value + aligned_tcb_address; | |
201 | break; | |
202 | default: | |
203 | gold_unreachable(); | |
204 | } | |
205 | elfcpp::Swap<size, big_endian>::writeval(wv, x); | |
206 | } | |
207 | ||
208 | of->write_output_view(offset, oview_size, oview); | |
053a4d68 JY |
209 | } |
210 | ||
211 | private: | |
9363c7c3 JY |
212 | // Symbol table of the output object. |
213 | Symbol_table* symbol_table_; | |
053a4d68 JY |
214 | // A pointer to the Layout class, so that we can find the .dynamic |
215 | // section when we write out the GOT section. | |
216 | Layout* layout_; | |
8e33481e | 217 | |
8e33481e HS |
218 | // This class represent dynamic relocations that need to be applied by |
219 | // gold because we are using TLS relocations in a static link. | |
220 | class Static_reloc | |
221 | { | |
222 | public: | |
223 | Static_reloc(unsigned int got_offset, unsigned int r_type, Symbol* gsym) | |
224 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(true) | |
225 | { this->u_.global.symbol = gsym; } | |
226 | ||
227 | Static_reloc(unsigned int got_offset, unsigned int r_type, | |
228 | Sized_relobj_file<size, big_endian>* relobj, unsigned int index) | |
229 | : got_offset_(got_offset), r_type_(r_type), symbol_is_global_(false) | |
230 | { | |
231 | this->u_.local.relobj = relobj; | |
232 | this->u_.local.index = index; | |
233 | } | |
234 | ||
235 | // Return the GOT offset. | |
236 | unsigned int | |
237 | got_offset() const | |
238 | { return this->got_offset_; } | |
239 | ||
240 | // Relocation type. | |
241 | unsigned int | |
242 | r_type() const | |
243 | { return this->r_type_; } | |
244 | ||
245 | // Whether the symbol is global or not. | |
246 | bool | |
247 | symbol_is_global() const | |
248 | { return this->symbol_is_global_; } | |
249 | ||
250 | // For a relocation against a global symbol, the global symbol. | |
251 | Symbol* | |
252 | symbol() const | |
253 | { | |
254 | gold_assert(this->symbol_is_global_); | |
255 | return this->u_.global.symbol; | |
256 | } | |
257 | ||
258 | // For a relocation against a local symbol, the defining object. | |
259 | Sized_relobj_file<size, big_endian>* | |
260 | relobj() const | |
261 | { | |
262 | gold_assert(!this->symbol_is_global_); | |
263 | return this->u_.local.relobj; | |
264 | } | |
265 | ||
266 | // For a relocation against a local symbol, the local symbol index. | |
267 | unsigned int | |
268 | index() const | |
269 | { | |
270 | gold_assert(!this->symbol_is_global_); | |
271 | return this->u_.local.index; | |
272 | } | |
273 | ||
274 | private: | |
275 | // GOT offset of the entry to which this relocation is applied. | |
276 | unsigned int got_offset_; | |
277 | // Type of relocation. | |
278 | unsigned int r_type_; | |
279 | // Whether this relocation is against a global symbol. | |
280 | bool symbol_is_global_; | |
281 | // A global or local symbol. | |
282 | union | |
283 | { | |
83a01957 HS |
284 | struct |
285 | { | |
286 | // For a global symbol, the symbol itself. | |
287 | Symbol* symbol; | |
288 | } global; | |
289 | struct | |
290 | { | |
291 | // For a local symbol, the object defining the symbol. | |
292 | Sized_relobj_file<size, big_endian>* relobj; | |
293 | // For a local symbol, the symbol index. | |
294 | unsigned int index; | |
295 | } local; | |
296 | } u_; | |
297 | }; // End of inner class Static_reloc | |
298 | ||
299 | std::vector<Static_reloc> static_relocs_; | |
300 | }; // End of Output_data_got_aarch64 | |
301 | ||
302 | ||
303 | template<int size, bool big_endian> | |
304 | class AArch64_input_section; | |
305 | ||
306 | ||
307 | template<int size, bool big_endian> | |
308 | class AArch64_output_section; | |
309 | ||
310 | ||
311 | // Reloc stub class. | |
312 | ||
313 | template<int size, bool big_endian> | |
314 | class Reloc_stub | |
315 | { | |
316 | public: | |
317 | typedef Reloc_stub<size, big_endian> This; | |
318 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
319 | ||
320 | // Do not change the value of the enums, they are used to index into | |
321 | // stub_insns array. | |
322 | typedef enum | |
323 | { | |
324 | ST_NONE = 0, | |
325 | ||
326 | // Using adrp/add pair, 4 insns (including alignment) without mem access, | |
327 | // the fastest stub. This has a limited jump distance, which is tested by | |
328 | // aarch64_valid_for_adrp_p. | |
329 | ST_ADRP_BRANCH = 1, | |
330 | ||
331 | // Using ldr-absolute-address/br-register, 4 insns with 1 mem access, | |
332 | // unlimited in jump distance. | |
333 | ST_LONG_BRANCH_ABS = 2, | |
334 | ||
335 | // Using ldr/calculate-pcrel/jump, 8 insns (including alignment) with 1 mem | |
336 | // access, slowest one. Only used in position independent executables. | |
337 | ST_LONG_BRANCH_PCREL = 3, | |
338 | ||
339 | } Stub_type; | |
340 | ||
341 | // Branch range. This is used to calculate the section group size, as well as | |
342 | // determine whether a stub is needed. | |
343 | static const int MAX_BRANCH_OFFSET = ((1 << 25) - 1) << 2; | |
344 | static const int MIN_BRANCH_OFFSET = -((1 << 25) << 2); | |
345 | ||
346 | // Constant used to determine if an offset fits in the adrp instruction | |
347 | // encoding. | |
348 | static const int MAX_ADRP_IMM = (1 << 20) - 1; | |
349 | static const int MIN_ADRP_IMM = -(1 << 20); | |
350 | ||
351 | static const int BYTES_PER_INSN = 4; | |
352 | static const int STUB_ADDR_ALIGN = 4; | |
353 | ||
354 | // Determine whether the offset fits in the jump/branch instruction. | |
355 | static bool | |
356 | aarch64_valid_branch_offset_p(int64_t offset) | |
357 | { return offset >= MIN_BRANCH_OFFSET && offset <= MAX_BRANCH_OFFSET; } | |
358 | ||
359 | // Determine whether the offset fits in the adrp immediate field. | |
360 | static bool | |
361 | aarch64_valid_for_adrp_p(AArch64_address location, AArch64_address dest) | |
362 | { | |
363 | typedef AArch64_relocate_functions<size, big_endian> Reloc; | |
364 | int64_t adrp_imm = (Reloc::Page(dest) - Reloc::Page(location)) >> 12; | |
365 | return adrp_imm >= MIN_ADRP_IMM && adrp_imm <= MAX_ADRP_IMM; | |
366 | } | |
367 | ||
368 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is | |
369 | // needed. | |
370 | static Stub_type | |
371 | stub_type_for_reloc(unsigned int r_type, AArch64_address address, | |
372 | AArch64_address target); | |
373 | ||
374 | Reloc_stub(Stub_type stub_type) | |
375 | : stub_type_(stub_type), offset_(invalid_offset), | |
376 | destination_address_(invalid_address) | |
377 | { } | |
378 | ||
379 | ~Reloc_stub() | |
380 | { } | |
381 | ||
382 | // Return offset of code stub from beginning of its containing stub table. | |
383 | section_offset_type | |
384 | offset() const | |
385 | { | |
386 | gold_assert(this->offset_ != invalid_offset); | |
387 | return this->offset_; | |
388 | } | |
389 | ||
390 | // Set offset of code stub from beginning of its containing stub table. | |
391 | void | |
392 | set_offset(section_offset_type offset) | |
393 | { this->offset_ = offset; } | |
394 | ||
395 | // Return destination address. | |
396 | AArch64_address | |
397 | destination_address() const | |
398 | { | |
399 | gold_assert(this->destination_address_ != this->invalid_address); | |
400 | return this->destination_address_; | |
401 | } | |
402 | ||
403 | // Set destination address. | |
404 | void | |
405 | set_destination_address(AArch64_address address) | |
406 | { | |
407 | gold_assert(address != this->invalid_address); | |
408 | this->destination_address_ = address; | |
409 | } | |
410 | ||
411 | // Reset the destination address. | |
412 | void | |
413 | reset_destination_address() | |
414 | { this->destination_address_ = this->invalid_address; } | |
415 | ||
416 | // Return the stub type. | |
417 | Stub_type | |
418 | stub_type() const | |
419 | { return stub_type_; } | |
420 | ||
421 | // Return the stub size. | |
422 | uint32_t | |
423 | stub_size() const | |
424 | { return this->stub_insn_number() * BYTES_PER_INSN; } | |
425 | ||
426 | // Return the instruction number of this stub instance. | |
427 | int | |
428 | stub_insn_number() const | |
429 | { return stub_insns_[this->stub_type_][0]; } | |
430 | ||
431 | // Note the first "insn" is the number of total insns in this array. | |
432 | const uint32_t* | |
433 | stub_insns() const | |
434 | { return stub_insns_[this->stub_type_]; } | |
435 | ||
436 | // Write stub to output file. | |
437 | void | |
438 | write(unsigned char* view, section_size_type view_size) | |
439 | { this->do_write(view, view_size); } | |
440 | ||
441 | // The key class used to index the stub instance in the stub table's stub map. | |
442 | class Key | |
443 | { | |
444 | public: | |
445 | Key(Stub_type stub_type, const Symbol* symbol, const Relobj* relobj, | |
446 | unsigned int r_sym, int32_t addend) | |
447 | : stub_type_(stub_type), addend_(addend) | |
448 | { | |
449 | if (symbol != NULL) | |
450 | { | |
451 | this->r_sym_ = Reloc_stub::invalid_index; | |
452 | this->u_.symbol = symbol; | |
453 | } | |
454 | else | |
455 | { | |
456 | gold_assert(relobj != NULL && r_sym != invalid_index); | |
457 | this->r_sym_ = r_sym; | |
458 | this->u_.relobj = relobj; | |
459 | } | |
460 | } | |
461 | ||
462 | ~Key() | |
463 | { } | |
464 | ||
465 | // Return stub type. | |
466 | Stub_type | |
467 | stub_type() const | |
468 | { return this->stub_type_; } | |
469 | ||
470 | // Return the local symbol index or invalid_index. | |
471 | unsigned int | |
472 | r_sym() const | |
473 | { return this->r_sym_; } | |
474 | ||
475 | // Return the symbol if there is one. | |
476 | const Symbol* | |
477 | symbol() const | |
478 | { return this->r_sym_ == invalid_index ? this->u_.symbol : NULL; } | |
479 | ||
480 | // Return the relobj if there is one. | |
481 | const Relobj* | |
482 | relobj() const | |
483 | { return this->r_sym_ != invalid_index ? this->u_.relobj : NULL; } | |
484 | ||
485 | // Whether this equals to another key k. | |
486 | bool | |
487 | eq(const Key& k) const | |
488 | { | |
489 | return ((this->stub_type_ == k.stub_type_) | |
490 | && (this->r_sym_ == k.r_sym_) | |
491 | && ((this->r_sym_ != Reloc_stub::invalid_index) | |
492 | ? (this->u_.relobj == k.u_.relobj) | |
493 | : (this->u_.symbol == k.u_.symbol)) | |
494 | && (this->addend_ == k.addend_)); | |
495 | } | |
496 | ||
497 | // Return a hash value. | |
498 | size_t | |
499 | hash_value() const | |
500 | { | |
501 | size_t name_hash_value = gold::string_hash<char>( | |
502 | (this->r_sym_ != Reloc_stub::invalid_index) | |
503 | ? this->u_.relobj->name().c_str() | |
504 | : this->u_.symbol->name()); | |
505 | // We only have 4 stub types. | |
506 | size_t stub_type_hash_value = 0x03 & this->stub_type_; | |
507 | return (name_hash_value | |
508 | ^ stub_type_hash_value | |
509 | ^ ((this->r_sym_ & 0x3fff) << 2) | |
510 | ^ ((this->addend_ & 0xffff) << 16)); | |
511 | } | |
512 | ||
513 | // Functors for STL associative containers. | |
514 | struct hash | |
515 | { | |
516 | size_t | |
517 | operator()(const Key& k) const | |
518 | { return k.hash_value(); } | |
519 | }; | |
520 | ||
521 | struct equal_to | |
522 | { | |
523 | bool | |
524 | operator()(const Key& k1, const Key& k2) const | |
525 | { return k1.eq(k2); } | |
526 | }; | |
527 | ||
9726c3c1 | 528 | private: |
83a01957 HS |
529 | // Stub type. |
530 | const Stub_type stub_type_; | |
531 | // If this is a local symbol, this is the index in the defining object. | |
532 | // Otherwise, it is invalid_index for a global symbol. | |
533 | unsigned int r_sym_; | |
534 | // If r_sym_ is an invalid index, this points to a global symbol. | |
535 | // Otherwise, it points to a relobj. We used the unsized and target | |
536 | // independent Symbol and Relobj classes instead of Sized_symbol<32> and | |
537 | // Arm_relobj, in order to avoid making the stub class a template | |
538 | // as most of the stub machinery is endianness-neutral. However, it | |
539 | // may require a bit of casting done by users of this class. | |
540 | union | |
541 | { | |
542 | const Symbol* symbol; | |
543 | const Relobj* relobj; | |
544 | } u_; | |
545 | // Addend associated with a reloc. | |
546 | int32_t addend_; | |
547 | }; // End of inner class Reloc_stub::Key | |
548 | ||
549 | protected: | |
550 | // This may be overridden in the child class. | |
551 | virtual void | |
552 | do_write(unsigned char*, section_size_type); | |
553 | ||
554 | private: | |
555 | static const section_offset_type invalid_offset = | |
556 | static_cast<section_offset_type>(-1); | |
557 | static const unsigned int invalid_index = static_cast<unsigned int>(-1); | |
558 | static const AArch64_address invalid_address = | |
559 | static_cast<AArch64_address>(-1); | |
560 | ||
561 | static const uint32_t stub_insns_[][10]; | |
562 | ||
563 | const Stub_type stub_type_; | |
564 | section_offset_type offset_; | |
565 | AArch64_address destination_address_; | |
566 | }; // End of Reloc_stub | |
567 | ||
568 | ||
569 | // Write data to output file. | |
570 | ||
571 | template<int size, bool big_endian> | |
572 | void | |
573 | Reloc_stub<size, big_endian>:: | |
574 | do_write(unsigned char* view, section_size_type) | |
575 | { | |
576 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
577 | const uint32_t* insns = this->stub_insns(); | |
578 | uint32_t num_insns = this->stub_insn_number(); | |
579 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
580 | for (uint32_t i = 1; i <= num_insns; ++i) | |
581 | elfcpp::Swap<32, big_endian>::writeval(ip + i - 1, insns[i]); | |
582 | } | |
583 | ||
584 | ||
585 | // Stubs instructions definition. | |
586 | ||
587 | template<int size, bool big_endian> | |
588 | const uint32_t | |
589 | Reloc_stub<size, big_endian>::stub_insns_[][10] = | |
590 | { | |
591 | // The first element of each group is the num of the insns. | |
592 | ||
593 | // ST_NONE | |
594 | {0, 0}, | |
595 | ||
596 | // ST_ADRP_BRANCH | |
597 | { | |
598 | 4, | |
599 | 0x90000010, /* adrp ip0, X */ | |
600 | /* ADR_PREL_PG_HI21(X) */ | |
601 | 0x91000210, /* add ip0, ip0, :lo12:X */ | |
602 | /* ADD_ABS_LO12_NC(X) */ | |
603 | 0xd61f0200, /* br ip0 */ | |
604 | 0x00000000, /* alignment padding */ | |
605 | }, | |
606 | ||
607 | // ST_LONG_BRANCH_ABS | |
608 | { | |
609 | 4, | |
610 | 0x58000050, /* ldr ip0, 0x8 */ | |
611 | 0xd61f0200, /* br ip0 */ | |
612 | 0x00000000, /* address field */ | |
613 | 0x00000000, /* address fields */ | |
614 | }, | |
615 | ||
616 | // ST_LONG_BRANCH_PCREL | |
617 | { | |
618 | 8, | |
619 | 0x58000090, /* ldr ip0, 0x10 */ | |
620 | 0x10000011, /* adr ip1, #0 */ | |
621 | 0x8b110210, /* add ip0, ip0, ip1 */ | |
622 | 0xd61f0200, /* br ip0 */ | |
623 | 0x00000000, /* address field */ | |
624 | 0x00000000, /* address field */ | |
625 | 0x00000000, /* alignment padding */ | |
626 | 0x00000000, /* alignment padding */ | |
627 | } | |
628 | }; | |
629 | ||
630 | ||
631 | // Determine the stub type for a certain relocation or ST_NONE, if no stub is | |
632 | // needed. | |
633 | ||
634 | template<int size, bool big_endian> | |
635 | inline | |
636 | typename Reloc_stub<size, big_endian>::Stub_type | |
637 | Reloc_stub<size, big_endian>::stub_type_for_reloc( | |
638 | unsigned int r_type, AArch64_address location, AArch64_address dest) | |
639 | { | |
640 | int64_t branch_offset = 0; | |
641 | switch(r_type) | |
642 | { | |
643 | case elfcpp::R_AARCH64_CALL26: | |
644 | case elfcpp::R_AARCH64_JUMP26: | |
645 | branch_offset = dest - location; | |
646 | break; | |
647 | default: | |
9726c3c1 | 648 | gold_unreachable(); |
83a01957 HS |
649 | } |
650 | ||
651 | if (aarch64_valid_branch_offset_p(branch_offset)) | |
652 | return ST_NONE; | |
653 | ||
654 | if (aarch64_valid_for_adrp_p(location, dest)) | |
655 | return ST_ADRP_BRANCH; | |
656 | ||
657 | if (parameters->options().output_is_position_independent() | |
658 | && parameters->options().output_is_executable()) | |
659 | return ST_LONG_BRANCH_PCREL; | |
660 | ||
661 | return ST_LONG_BRANCH_ABS; | |
662 | } | |
663 | ||
664 | // A class to hold stubs for the ARM target. | |
665 | ||
666 | template<int size, bool big_endian> | |
667 | class Stub_table : public Output_data | |
668 | { | |
669 | public: | |
670 | typedef Target_aarch64<size, big_endian> The_target_aarch64; | |
671 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
672 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
673 | typedef Reloc_stub<size, big_endian> The_reloc_stub; | |
674 | typedef typename The_reloc_stub::Key The_reloc_stub_key; | |
675 | typedef typename The_reloc_stub_key::hash The_reloc_stub_key_hash; | |
676 | typedef typename The_reloc_stub_key::equal_to The_reloc_stub_key_equal_to; | |
677 | typedef Stub_table<size, big_endian> The_stub_table; | |
678 | typedef Unordered_map<The_reloc_stub_key, The_reloc_stub*, | |
679 | The_reloc_stub_key_hash, The_reloc_stub_key_equal_to> | |
680 | Reloc_stub_map; | |
681 | typedef typename Reloc_stub_map::const_iterator Reloc_stub_map_const_iter; | |
682 | typedef Relocate_info<size, big_endian> The_relocate_info; | |
683 | ||
684 | Stub_table(The_aarch64_input_section* owner) | |
685 | : Output_data(), owner_(owner), reloc_stubs_size_(0), prev_data_size_(0) | |
686 | { } | |
687 | ||
688 | ~Stub_table() | |
689 | { } | |
690 | ||
691 | The_aarch64_input_section* | |
692 | owner() const | |
693 | { return owner_; } | |
694 | ||
695 | // Whether this stub table is empty. | |
696 | bool | |
697 | empty() const | |
698 | { return reloc_stubs_.empty(); } | |
699 | ||
700 | // Return the current data size. | |
701 | off_t | |
702 | current_data_size() const | |
703 | { return this->current_data_size_for_child(); } | |
704 | ||
705 | // Add a STUB using KEY. The caller is responsible for avoiding addition | |
706 | // if a STUB with the same key has already been added. | |
707 | void | |
708 | add_reloc_stub(The_reloc_stub* stub, const The_reloc_stub_key& key); | |
709 | ||
710 | // Finalize stubs. No-op here, just for completeness. | |
711 | void | |
712 | finalize_stubs() | |
713 | { } | |
714 | ||
715 | // Look up a relocation stub using KEY. Return NULL if there is none. | |
716 | The_reloc_stub* | |
717 | find_reloc_stub(The_reloc_stub_key& key) | |
718 | { | |
719 | Reloc_stub_map_const_iter p = this->reloc_stubs_.find(key); | |
720 | return (p != this->reloc_stubs_.end()) ? p->second : NULL; | |
721 | } | |
722 | ||
723 | // Relocate stubs in this stub table. | |
724 | void | |
725 | relocate_stubs(const The_relocate_info*, | |
726 | The_target_aarch64*, | |
727 | Output_section*, | |
728 | unsigned char*, | |
729 | AArch64_address, | |
730 | section_size_type); | |
731 | ||
732 | // Update data size at the end of a relaxation pass. Return true if data size | |
733 | // is different from that of the previous relaxation pass. | |
734 | bool | |
735 | update_data_size_changed_p() | |
736 | { | |
737 | // No addralign changed here. | |
738 | off_t s = this->reloc_stubs_size_; | |
739 | bool changed = (s != this->prev_data_size_); | |
740 | this->prev_data_size_ = s; | |
741 | return changed; | |
742 | } | |
743 | ||
744 | protected: | |
745 | // Write out section contents. | |
746 | void | |
747 | do_write(Output_file*); | |
748 | ||
749 | // Return the required alignment. | |
750 | uint64_t | |
751 | do_addralign() const | |
752 | { return The_reloc_stub::STUB_ADDR_ALIGN; } | |
753 | ||
754 | // Reset address and file offset. | |
755 | void | |
756 | do_reset_address_and_file_offset() | |
757 | { this->set_current_data_size_for_child(this->prev_data_size_); } | |
758 | ||
759 | // Set final data size. | |
760 | void | |
761 | set_final_data_size() | |
762 | { this->set_data_size(this->current_data_size()); } | |
763 | ||
764 | private: | |
765 | // Relocate one stub. | |
766 | void | |
767 | relocate_stub(The_reloc_stub*, | |
768 | const The_relocate_info*, | |
769 | The_target_aarch64*, | |
770 | Output_section*, | |
771 | unsigned char*, | |
772 | AArch64_address, | |
773 | section_size_type); | |
774 | ||
775 | private: | |
776 | // Owner of this stub table. | |
777 | The_aarch64_input_section* owner_; | |
778 | // The relocation stubs. | |
779 | Reloc_stub_map reloc_stubs_; | |
780 | // Size of reloc stubs. | |
781 | off_t reloc_stubs_size_; | |
782 | // data size of this in the previous pass. | |
783 | off_t prev_data_size_; | |
784 | }; // End of Stub_table | |
785 | ||
786 | ||
787 | // Add a STUB using KEY. The caller is responsible for avoiding addition | |
788 | // if a STUB with the same key has already been added. | |
789 | ||
790 | template<int size, bool big_endian> | |
791 | void | |
792 | Stub_table<size, big_endian>::add_reloc_stub( | |
793 | The_reloc_stub* stub, const The_reloc_stub_key& key) | |
794 | { | |
795 | gold_assert(stub->stub_type() == key.stub_type()); | |
796 | this->reloc_stubs_[key] = stub; | |
797 | ||
798 | // Assign stub offset early. We can do this because we never remove | |
799 | // reloc stubs and they are in the beginning of the stub table. | |
800 | this->reloc_stubs_size_ = align_address(this->reloc_stubs_size_, | |
801 | The_reloc_stub::STUB_ADDR_ALIGN); | |
802 | stub->set_offset(this->reloc_stubs_size_); | |
803 | this->reloc_stubs_size_ += stub->stub_size(); | |
804 | } | |
805 | ||
806 | ||
807 | // Relocate all stubs in this stub table. | |
808 | ||
809 | template<int size, bool big_endian> | |
810 | void | |
811 | Stub_table<size, big_endian>:: | |
812 | relocate_stubs(const The_relocate_info* relinfo, | |
813 | The_target_aarch64* target_aarch64, | |
814 | Output_section* output_section, | |
815 | unsigned char* view, | |
816 | AArch64_address address, | |
817 | section_size_type view_size) | |
818 | { | |
819 | // "view_size" is the total size of the stub_table. | |
820 | gold_assert(address == this->address() && | |
821 | view_size == static_cast<section_size_type>(this->data_size())); | |
822 | for(Reloc_stub_map_const_iter p = this->reloc_stubs_.begin(); | |
823 | p != this->reloc_stubs_.end(); ++p) | |
824 | relocate_stub(p->second, relinfo, target_aarch64, output_section, | |
825 | view, address, view_size); | |
826 | } | |
827 | ||
828 | ||
829 | // Relocate one stub. This is a helper for Stub_table::relocate_stubs(). | |
830 | ||
831 | template<int size, bool big_endian> | |
832 | void | |
833 | Stub_table<size, big_endian>:: | |
834 | relocate_stub(The_reloc_stub* stub, | |
835 | const The_relocate_info* relinfo, | |
836 | The_target_aarch64* target_aarch64, | |
837 | Output_section* output_section, | |
838 | unsigned char* view, | |
839 | AArch64_address address, | |
840 | section_size_type view_size) | |
841 | { | |
842 | // "offset" is the offset from the beginning of the stub_table. | |
843 | section_size_type offset = stub->offset(); | |
844 | section_size_type stub_size = stub->stub_size(); | |
845 | // "view_size" is the total size of the stub_table. | |
846 | gold_assert(offset + stub_size <= view_size); | |
847 | ||
848 | target_aarch64->relocate_stub(stub, relinfo, output_section, | |
849 | view + offset, address + offset, view_size); | |
850 | } | |
851 | ||
852 | ||
853 | // Write out the stubs to file. | |
854 | ||
855 | template<int size, bool big_endian> | |
856 | void | |
857 | Stub_table<size, big_endian>::do_write(Output_file* of) | |
858 | { | |
859 | off_t offset = this->offset(); | |
860 | const section_size_type oview_size = | |
861 | convert_to_section_size_type(this->data_size()); | |
862 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
863 | ||
864 | // Write relocation stubs. | |
865 | for (typename Reloc_stub_map::const_iterator p = this->reloc_stubs_.begin(); | |
866 | p != this->reloc_stubs_.end(); ++p) | |
867 | { | |
868 | The_reloc_stub* stub = p->second; | |
869 | AArch64_address address = this->address() + stub->offset(); | |
870 | gold_assert(address == | |
871 | align_address(address, The_reloc_stub::STUB_ADDR_ALIGN)); | |
872 | stub->write(oview + stub->offset(), stub->stub_size()); | |
873 | } | |
874 | ||
875 | of->write_output_view(this->offset(), oview_size, oview); | |
876 | } | |
877 | ||
878 | ||
879 | // AArch64_relobj class. | |
880 | ||
881 | template<int size, bool big_endian> | |
882 | class AArch64_relobj : public Sized_relobj_file<size, big_endian> | |
883 | { | |
884 | public: | |
885 | typedef AArch64_relobj<size, big_endian> This; | |
886 | typedef Target_aarch64<size, big_endian> The_target_aarch64; | |
887 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
888 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
889 | typedef Stub_table<size, big_endian> The_stub_table; | |
890 | typedef std::vector<The_stub_table*> Stub_table_list; | |
891 | static const AArch64_address invalid_address = | |
892 | static_cast<AArch64_address>(-1); | |
893 | ||
894 | AArch64_relobj(const std::string& name, Input_file* input_file, off_t offset, | |
895 | const typename elfcpp::Ehdr<size, big_endian>& ehdr) | |
896 | : Sized_relobj_file<size, big_endian>(name, input_file, offset, ehdr), | |
897 | stub_tables_() | |
898 | { } | |
899 | ||
900 | ~AArch64_relobj() | |
901 | { } | |
902 | ||
903 | // Return the stub table of the SHNDX-th section if there is one. | |
904 | The_stub_table* | |
905 | stub_table(unsigned int shndx) const | |
906 | { | |
907 | gold_assert(shndx < this->stub_tables_.size()); | |
908 | return this->stub_tables_[shndx]; | |
909 | } | |
910 | ||
911 | // Set STUB_TABLE to be the stub_table of the SHNDX-th section. | |
912 | void | |
913 | set_stub_table(unsigned int shndx, The_stub_table* stub_table) | |
914 | { | |
915 | gold_assert(shndx < this->stub_tables_.size()); | |
916 | this->stub_tables_[shndx] = stub_table; | |
917 | } | |
918 | ||
919 | // Scan all relocation sections for stub generation. | |
920 | void | |
921 | scan_sections_for_stubs(The_target_aarch64*, const Symbol_table*, | |
922 | const Layout*); | |
923 | ||
924 | // Whether a section is a scannable text section. | |
925 | bool | |
926 | text_section_is_scannable(const elfcpp::Shdr<size, big_endian>&, unsigned int, | |
927 | const Output_section*, const Symbol_table*); | |
928 | ||
929 | // Convert regular input section with index SHNDX to a relaxed section. | |
930 | void | |
931 | convert_input_section_to_relaxed_section(unsigned /* shndx */) | |
932 | { | |
933 | // The stubs have relocations and we need to process them after writing | |
934 | // out the stubs. So relocation now must follow section write. | |
935 | this->set_relocs_must_follow_section_writes(); | |
936 | } | |
937 | ||
938 | protected: | |
939 | // Post constructor setup. | |
940 | void | |
941 | do_setup() | |
942 | { | |
943 | // Call parent's setup method. | |
944 | Sized_relobj_file<size, big_endian>::do_setup(); | |
945 | ||
946 | // Initialize look-up tables. | |
947 | this->stub_tables_.resize(this->shnum()); | |
948 | } | |
949 | ||
950 | virtual void | |
951 | do_relocate_sections( | |
952 | const Symbol_table* symtab, const Layout* layout, | |
953 | const unsigned char* pshdrs, Output_file* of, | |
954 | typename Sized_relobj_file<size, big_endian>::Views* pviews); | |
955 | ||
956 | private: | |
957 | // Whether a section needs to be scanned for relocation stubs. | |
958 | bool | |
959 | section_needs_reloc_stub_scanning(const elfcpp::Shdr<size, big_endian>&, | |
960 | const Relobj::Output_sections&, | |
961 | const Symbol_table*, const unsigned char*); | |
962 | ||
963 | // List of stub tables. | |
964 | Stub_table_list stub_tables_; | |
965 | }; // End of AArch64_relobj | |
966 | ||
967 | ||
968 | // Relocate sections. | |
969 | ||
970 | template<int size, bool big_endian> | |
971 | void | |
972 | AArch64_relobj<size, big_endian>::do_relocate_sections( | |
973 | const Symbol_table* symtab, const Layout* layout, | |
974 | const unsigned char* pshdrs, Output_file* of, | |
975 | typename Sized_relobj_file<size, big_endian>::Views* pviews) | |
976 | { | |
977 | // Call parent to relocate sections. | |
978 | Sized_relobj_file<size, big_endian>::do_relocate_sections(symtab, layout, | |
979 | pshdrs, of, pviews); | |
980 | ||
981 | // We do not generate stubs if doing a relocatable link. | |
982 | if (parameters->options().relocatable()) | |
983 | return; | |
984 | ||
985 | Relocate_info<size, big_endian> relinfo; | |
986 | relinfo.symtab = symtab; | |
987 | relinfo.layout = layout; | |
988 | relinfo.object = this; | |
989 | ||
990 | // Relocate stub tables. | |
991 | unsigned int shnum = this->shnum(); | |
992 | The_target_aarch64* target = The_target_aarch64::current_target(); | |
993 | ||
994 | for (unsigned int i = 1; i < shnum; ++i) | |
995 | { | |
996 | The_aarch64_input_section* aarch64_input_section = | |
997 | target->find_aarch64_input_section(this, i); | |
998 | if (aarch64_input_section != NULL | |
999 | && aarch64_input_section->is_stub_table_owner() | |
1000 | && !aarch64_input_section->stub_table()->empty()) | |
1001 | { | |
1002 | Output_section* os = this->output_section(i); | |
1003 | gold_assert(os != NULL); | |
1004 | ||
1005 | relinfo.reloc_shndx = elfcpp::SHN_UNDEF; | |
1006 | relinfo.reloc_shdr = NULL; | |
1007 | relinfo.data_shndx = i; | |
1008 | relinfo.data_shdr = pshdrs + i * elfcpp::Elf_sizes<size>::shdr_size; | |
1009 | ||
1010 | typename Sized_relobj_file<size, big_endian>::View_size& | |
1011 | view_struct = (*pviews)[i]; | |
1012 | gold_assert(view_struct.view != NULL); | |
1013 | ||
1014 | The_stub_table* stub_table = aarch64_input_section->stub_table(); | |
1015 | off_t offset = stub_table->address() - view_struct.address; | |
1016 | unsigned char* view = view_struct.view + offset; | |
1017 | AArch64_address address = stub_table->address(); | |
1018 | section_size_type view_size = stub_table->data_size(); | |
1019 | stub_table->relocate_stubs(&relinfo, target, os, view, address, | |
1020 | view_size); | |
1021 | } | |
1022 | } | |
1023 | } | |
1024 | ||
1025 | ||
1026 | // Determine if an input section is scannable for stub processing. SHDR is | |
1027 | // the header of the section and SHNDX is the section index. OS is the output | |
1028 | // section for the input section and SYMTAB is the global symbol table used to | |
1029 | // look up ICF information. | |
1030 | ||
1031 | template<int size, bool big_endian> | |
1032 | bool | |
1033 | AArch64_relobj<size, big_endian>::text_section_is_scannable( | |
1034 | const elfcpp::Shdr<size, big_endian>& text_shdr, | |
1035 | unsigned int text_shndx, | |
1036 | const Output_section* os, | |
1037 | const Symbol_table* symtab) | |
1038 | { | |
1039 | // Skip any empty sections, unallocated sections or sections whose | |
1040 | // type are not SHT_PROGBITS. | |
1041 | if (text_shdr.get_sh_size() == 0 | |
1042 | || (text_shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0 | |
1043 | || text_shdr.get_sh_type() != elfcpp::SHT_PROGBITS) | |
1044 | return false; | |
1045 | ||
1046 | // Skip any discarded or ICF'ed sections. | |
1047 | if (os == NULL || symtab->is_section_folded(this, text_shndx)) | |
1048 | return false; | |
1049 | ||
1050 | // Skip exception frame. | |
1051 | if (strcmp(os->name(), ".eh_frame") == 0) | |
1052 | return false ; | |
1053 | ||
1054 | gold_assert(!this->is_output_section_offset_invalid(text_shndx) || | |
1055 | os->find_relaxed_input_section(this, text_shndx) != NULL); | |
1056 | ||
1057 | return true; | |
1058 | } | |
1059 | ||
1060 | ||
1061 | // Determine if we want to scan the SHNDX-th section for relocation stubs. | |
1062 | // This is a helper for AArch64_relobj::scan_sections_for_stubs(). | |
1063 | ||
1064 | template<int size, bool big_endian> | |
1065 | bool | |
1066 | AArch64_relobj<size, big_endian>::section_needs_reloc_stub_scanning( | |
1067 | const elfcpp::Shdr<size, big_endian>& shdr, | |
1068 | const Relobj::Output_sections& out_sections, | |
1069 | const Symbol_table* symtab, | |
1070 | const unsigned char* pshdrs) | |
1071 | { | |
1072 | unsigned int sh_type = shdr.get_sh_type(); | |
1073 | if (sh_type != elfcpp::SHT_RELA) | |
1074 | return false; | |
1075 | ||
1076 | // Ignore empty section. | |
1077 | off_t sh_size = shdr.get_sh_size(); | |
1078 | if (sh_size == 0) | |
1079 | return false; | |
1080 | ||
1081 | // Ignore reloc section with unexpected symbol table. The | |
1082 | // error will be reported in the final link. | |
1083 | if (this->adjust_shndx(shdr.get_sh_link()) != this->symtab_shndx()) | |
1084 | return false; | |
1085 | ||
1086 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
1087 | unsigned int reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
1088 | ||
1089 | // Ignore reloc section with unexpected entsize or uneven size. | |
1090 | // The error will be reported in the final link. | |
1091 | if (reloc_size != shdr.get_sh_entsize() || sh_size % reloc_size != 0) | |
1092 | return false; | |
1093 | ||
1094 | // Ignore reloc section with bad info. This error will be | |
1095 | // reported in the final link. | |
1096 | unsigned int text_shndx = this->adjust_shndx(shdr.get_sh_info()); | |
1097 | if (text_shndx >= this->shnum()) | |
1098 | return false; | |
1099 | ||
1100 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1101 | const elfcpp::Shdr<size, big_endian> text_shdr(pshdrs + | |
1102 | text_shndx * shdr_size); | |
1103 | return this->text_section_is_scannable(text_shdr, text_shndx, | |
1104 | out_sections[text_shndx], symtab); | |
1105 | } | |
1106 | ||
1107 | ||
1108 | // Scan relocations for stub generation. | |
1109 | ||
1110 | template<int size, bool big_endian> | |
1111 | void | |
1112 | AArch64_relobj<size, big_endian>::scan_sections_for_stubs( | |
1113 | The_target_aarch64* target, | |
1114 | const Symbol_table* symtab, | |
1115 | const Layout* layout) | |
1116 | { | |
1117 | unsigned int shnum = this->shnum(); | |
1118 | const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size; | |
1119 | ||
1120 | // Read the section headers. | |
1121 | const unsigned char* pshdrs = this->get_view(this->elf_file()->shoff(), | |
1122 | shnum * shdr_size, | |
1123 | true, true); | |
1124 | ||
1125 | // To speed up processing, we set up hash tables for fast lookup of | |
1126 | // input offsets to output addresses. | |
1127 | this->initialize_input_to_output_maps(); | |
1128 | ||
1129 | const Relobj::Output_sections& out_sections(this->output_sections()); | |
1130 | ||
1131 | Relocate_info<size, big_endian> relinfo; | |
1132 | relinfo.symtab = symtab; | |
1133 | relinfo.layout = layout; | |
1134 | relinfo.object = this; | |
1135 | ||
1136 | // Do relocation stubs scanning. | |
1137 | const unsigned char* p = pshdrs + shdr_size; | |
1138 | for (unsigned int i = 1; i < shnum; ++i, p += shdr_size) | |
1139 | { | |
1140 | const elfcpp::Shdr<size, big_endian> shdr(p); | |
1141 | if (this->section_needs_reloc_stub_scanning(shdr, out_sections, symtab, | |
1142 | pshdrs)) | |
1143 | { | |
1144 | unsigned int index = this->adjust_shndx(shdr.get_sh_info()); | |
1145 | AArch64_address output_offset = | |
1146 | this->get_output_section_offset(index); | |
1147 | AArch64_address output_address; | |
1148 | if (output_offset != invalid_address) | |
1149 | { | |
1150 | output_address = out_sections[index]->address() + output_offset; | |
1151 | } | |
1152 | else | |
1153 | { | |
1154 | // Currently this only happens for a relaxed section. | |
1155 | const Output_relaxed_input_section* poris = | |
1156 | out_sections[index]->find_relaxed_input_section(this, index); | |
1157 | gold_assert(poris != NULL); | |
1158 | output_address = poris->address(); | |
1159 | } | |
1160 | ||
1161 | // Get the relocations. | |
1162 | const unsigned char* prelocs = this->get_view(shdr.get_sh_offset(), | |
1163 | shdr.get_sh_size(), | |
1164 | true, false); | |
1165 | ||
1166 | // Get the section contents. | |
1167 | section_size_type input_view_size = 0; | |
1168 | const unsigned char* input_view = | |
1169 | this->section_contents(index, &input_view_size, false); | |
1170 | ||
1171 | relinfo.reloc_shndx = i; | |
1172 | relinfo.data_shndx = index; | |
1173 | unsigned int sh_type = shdr.get_sh_type(); | |
1174 | unsigned int reloc_size; | |
1175 | gold_assert (sh_type == elfcpp::SHT_RELA); | |
1176 | reloc_size = elfcpp::Elf_sizes<size>::rela_size; | |
1177 | ||
1178 | Output_section* os = out_sections[index]; | |
1179 | target->scan_section_for_stubs(&relinfo, sh_type, prelocs, | |
1180 | shdr.get_sh_size() / reloc_size, | |
1181 | os, | |
1182 | output_offset == invalid_address, | |
1183 | input_view, output_address, | |
1184 | input_view_size); | |
1185 | } | |
1186 | } | |
1187 | } | |
1188 | ||
1189 | ||
1190 | // A class to wrap an ordinary input section containing executable code. | |
1191 | ||
1192 | template<int size, bool big_endian> | |
1193 | class AArch64_input_section : public Output_relaxed_input_section | |
1194 | { | |
1195 | public: | |
1196 | typedef Stub_table<size, big_endian> The_stub_table; | |
1197 | ||
1198 | AArch64_input_section(Relobj* relobj, unsigned int shndx) | |
1199 | : Output_relaxed_input_section(relobj, shndx, 1), | |
1200 | stub_table_(NULL), | |
1201 | original_contents_(NULL), original_size_(0), | |
1202 | original_addralign_(1) | |
1203 | { } | |
1204 | ||
1205 | ~AArch64_input_section() | |
1206 | { delete[] this->original_contents_; } | |
1207 | ||
1208 | // Initialize. | |
1209 | void | |
1210 | init(); | |
1211 | ||
1212 | // Set the stub_table. | |
1213 | void | |
1214 | set_stub_table(The_stub_table* st) | |
1215 | { this->stub_table_ = st; } | |
1216 | ||
1217 | // Whether this is a stub table owner. | |
1218 | bool | |
1219 | is_stub_table_owner() const | |
1220 | { return this->stub_table_ != NULL && this->stub_table_->owner() == this; } | |
1221 | ||
1222 | // Return the original size of the section. | |
1223 | uint32_t | |
1224 | original_size() const | |
1225 | { return this->original_size_; } | |
1226 | ||
1227 | // Return the stub table. | |
1228 | The_stub_table* | |
1229 | stub_table() | |
1230 | { return stub_table_; } | |
1231 | ||
1232 | protected: | |
1233 | // Write out this input section. | |
1234 | void | |
1235 | do_write(Output_file*); | |
1236 | ||
1237 | // Return required alignment of this. | |
1238 | uint64_t | |
1239 | do_addralign() const | |
1240 | { | |
1241 | if (this->is_stub_table_owner()) | |
1242 | return std::max(this->stub_table_->addralign(), | |
1243 | static_cast<uint64_t>(this->original_addralign_)); | |
1244 | else | |
1245 | return this->original_addralign_; | |
1246 | } | |
1247 | ||
1248 | // Finalize data size. | |
1249 | void | |
1250 | set_final_data_size(); | |
1251 | ||
1252 | // Reset address and file offset. | |
1253 | void | |
1254 | do_reset_address_and_file_offset(); | |
1255 | ||
1256 | // Output offset. | |
1257 | bool | |
1258 | do_output_offset(const Relobj* object, unsigned int shndx, | |
1259 | section_offset_type offset, | |
1260 | section_offset_type* poutput) const | |
1261 | { | |
1262 | if ((object == this->relobj()) | |
1263 | && (shndx == this->shndx()) | |
1264 | && (offset >= 0) | |
1265 | && (offset <= | |
1266 | convert_types<section_offset_type, uint32_t>(this->original_size_))) | |
1267 | { | |
1268 | *poutput = offset; | |
1269 | return true; | |
1270 | } | |
1271 | else | |
1272 | return false; | |
1273 | } | |
1274 | ||
1275 | private: | |
1276 | // Copying is not allowed. | |
1277 | AArch64_input_section(const AArch64_input_section&); | |
1278 | AArch64_input_section& operator=(const AArch64_input_section&); | |
1279 | ||
1280 | // The relocation stubs. | |
1281 | The_stub_table* stub_table_; | |
1282 | // Original section contents. We have to make a copy here since the file | |
1283 | // containing the original section may not be locked when we need to access | |
1284 | // the contents. | |
1285 | unsigned char* original_contents_; | |
1286 | // Section size of the original input section. | |
1287 | uint32_t original_size_; | |
1288 | // Address alignment of the original input section. | |
1289 | uint32_t original_addralign_; | |
1290 | }; // End of AArch64_input_section | |
1291 | ||
1292 | ||
1293 | // Finalize data size. | |
1294 | ||
1295 | template<int size, bool big_endian> | |
1296 | void | |
1297 | AArch64_input_section<size, big_endian>::set_final_data_size() | |
1298 | { | |
1299 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
1300 | ||
1301 | if (this->is_stub_table_owner()) | |
1302 | { | |
1303 | this->stub_table_->finalize_data_size(); | |
1304 | off = align_address(off, this->stub_table_->addralign()); | |
1305 | off += this->stub_table_->data_size(); | |
1306 | } | |
1307 | this->set_data_size(off); | |
1308 | } | |
1309 | ||
1310 | ||
1311 | // Reset address and file offset. | |
1312 | ||
1313 | template<int size, bool big_endian> | |
1314 | void | |
1315 | AArch64_input_section<size, big_endian>::do_reset_address_and_file_offset() | |
1316 | { | |
1317 | // Size of the original input section contents. | |
1318 | off_t off = convert_types<off_t, uint64_t>(this->original_size_); | |
1319 | ||
1320 | // If this is a stub table owner, account for the stub table size. | |
1321 | if (this->is_stub_table_owner()) | |
1322 | { | |
1323 | The_stub_table* stub_table = this->stub_table_; | |
1324 | ||
1325 | // Reset the stub table's address and file offset. The | |
1326 | // current data size for child will be updated after that. | |
1327 | stub_table_->reset_address_and_file_offset(); | |
1328 | off = align_address(off, stub_table_->addralign()); | |
1329 | off += stub_table->current_data_size(); | |
1330 | } | |
1331 | ||
1332 | this->set_current_data_size(off); | |
1333 | } | |
1334 | ||
1335 | ||
1336 | // Initialize an Arm_input_section. | |
1337 | ||
1338 | template<int size, bool big_endian> | |
1339 | void | |
1340 | AArch64_input_section<size, big_endian>::init() | |
1341 | { | |
1342 | Relobj* relobj = this->relobj(); | |
1343 | unsigned int shndx = this->shndx(); | |
1344 | ||
1345 | // We have to cache original size, alignment and contents to avoid locking | |
1346 | // the original file. | |
1347 | this->original_addralign_ = | |
1348 | convert_types<uint32_t, uint64_t>(relobj->section_addralign(shndx)); | |
1349 | ||
1350 | // This is not efficient but we expect only a small number of relaxed | |
1351 | // input sections for stubs. | |
1352 | section_size_type section_size; | |
1353 | const unsigned char* section_contents = | |
1354 | relobj->section_contents(shndx, §ion_size, false); | |
1355 | this->original_size_ = | |
1356 | convert_types<uint32_t, uint64_t>(relobj->section_size(shndx)); | |
1357 | ||
1358 | gold_assert(this->original_contents_ == NULL); | |
1359 | this->original_contents_ = new unsigned char[section_size]; | |
1360 | memcpy(this->original_contents_, section_contents, section_size); | |
1361 | ||
1362 | // We want to make this look like the original input section after | |
1363 | // output sections are finalized. | |
1364 | Output_section* os = relobj->output_section(shndx); | |
1365 | off_t offset = relobj->output_section_offset(shndx); | |
1366 | gold_assert(os != NULL && !relobj->is_output_section_offset_invalid(shndx)); | |
1367 | this->set_address(os->address() + offset); | |
1368 | this->set_file_offset(os->offset() + offset); | |
1369 | this->set_current_data_size(this->original_size_); | |
1370 | this->finalize_data_size(); | |
1371 | } | |
1372 | ||
1373 | ||
1374 | // Write data to output file. | |
1375 | ||
1376 | template<int size, bool big_endian> | |
1377 | void | |
1378 | AArch64_input_section<size, big_endian>::do_write(Output_file* of) | |
1379 | { | |
1380 | // We have to write out the original section content. | |
1381 | gold_assert(this->original_contents_ != NULL); | |
1382 | of->write(this->offset(), this->original_contents_, | |
1383 | this->original_size_); | |
1384 | ||
1385 | // If this owns a stub table and it is not empty, write it. | |
1386 | if (this->is_stub_table_owner() && !this->stub_table_->empty()) | |
1387 | this->stub_table_->write(of); | |
1388 | } | |
1389 | ||
1390 | ||
1391 | // Arm output section class. This is defined mainly to add a number of stub | |
1392 | // generation methods. | |
1393 | ||
1394 | template<int size, bool big_endian> | |
1395 | class AArch64_output_section : public Output_section | |
1396 | { | |
1397 | public: | |
1398 | typedef Target_aarch64<size, big_endian> The_target_aarch64; | |
1399 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; | |
1400 | typedef Stub_table<size, big_endian> The_stub_table; | |
1401 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
1402 | ||
1403 | public: | |
1404 | AArch64_output_section(const char* name, elfcpp::Elf_Word type, | |
1405 | elfcpp::Elf_Xword flags) | |
1406 | : Output_section(name, type, flags) | |
1407 | { } | |
1408 | ||
1409 | ~AArch64_output_section() {} | |
1410 | ||
1411 | // Group input sections for stub generation. | |
1412 | void | |
1413 | group_sections(section_size_type, bool, Target_aarch64<size, big_endian>*, | |
1414 | const Task*); | |
1415 | ||
1416 | private: | |
1417 | typedef Output_section::Input_section Input_section; | |
1418 | typedef Output_section::Input_section_list Input_section_list; | |
1419 | ||
1420 | // Create a stub group. | |
1421 | void | |
1422 | create_stub_group(Input_section_list::const_iterator, | |
1423 | Input_section_list::const_iterator, | |
1424 | Input_section_list::const_iterator, | |
1425 | The_target_aarch64*, | |
1426 | std::vector<Output_relaxed_input_section*>&, | |
1427 | const Task*); | |
1428 | }; // End of AArch64_output_section | |
1429 | ||
1430 | ||
1431 | // Create a stub group for input sections from FIRST to LAST. OWNER points to | |
1432 | // the input section that will be the owner of the stub table. | |
1433 | ||
1434 | template<int size, bool big_endian> void | |
1435 | AArch64_output_section<size, big_endian>::create_stub_group( | |
1436 | Input_section_list::const_iterator first, | |
1437 | Input_section_list::const_iterator last, | |
1438 | Input_section_list::const_iterator owner, | |
1439 | The_target_aarch64* target, | |
1440 | std::vector<Output_relaxed_input_section*>& new_relaxed_sections, | |
1441 | const Task* task) | |
1442 | { | |
1443 | // Currently we convert ordinary input sections into relaxed sections only | |
1444 | // at this point. | |
1445 | The_aarch64_input_section* input_section; | |
1446 | if (owner->is_relaxed_input_section()) | |
1447 | gold_unreachable(); | |
1448 | else | |
1449 | { | |
1450 | gold_assert(owner->is_input_section()); | |
1451 | // Create a new relaxed input section. We need to lock the original | |
1452 | // file. | |
1453 | Task_lock_obj<Object> tl(task, owner->relobj()); | |
1454 | input_section = | |
1455 | target->new_aarch64_input_section(owner->relobj(), owner->shndx()); | |
1456 | new_relaxed_sections.push_back(input_section); | |
1457 | } | |
1458 | ||
1459 | // Create a stub table. | |
1460 | The_stub_table* stub_table = | |
1461 | target->new_stub_table(input_section); | |
1462 | ||
1463 | input_section->set_stub_table(stub_table); | |
1464 | ||
1465 | Input_section_list::const_iterator p = first; | |
1466 | // Look for input sections or relaxed input sections in [first ... last]. | |
1467 | do | |
1468 | { | |
1469 | if (p->is_input_section() || p->is_relaxed_input_section()) | |
1470 | { | |
1471 | // The stub table information for input sections live | |
1472 | // in their objects. | |
1473 | The_aarch64_relobj* aarch64_relobj = | |
1474 | static_cast<The_aarch64_relobj*>(p->relobj()); | |
1475 | aarch64_relobj->set_stub_table(p->shndx(), stub_table); | |
1476 | } | |
1477 | } | |
1478 | while (p++ != last); | |
1479 | } | |
1480 | ||
1481 | ||
1482 | // Group input sections for stub generation. GROUP_SIZE is roughly the limit of | |
1483 | // stub groups. We grow a stub group by adding input section until the size is | |
1484 | // just below GROUP_SIZE. The last input section will be converted into a stub | |
1485 | // table owner. If STUB_ALWAYS_AFTER_BRANCH is false, we also add input sectiond | |
1486 | // after the stub table, effectively doubling the group size. | |
1487 | // | |
1488 | // This is similar to the group_sections() function in elf32-arm.c but is | |
1489 | // implemented differently. | |
1490 | ||
1491 | template<int size, bool big_endian> | |
1492 | void AArch64_output_section<size, big_endian>::group_sections( | |
1493 | section_size_type group_size, | |
1494 | bool stubs_always_after_branch, | |
1495 | Target_aarch64<size, big_endian>* target, | |
1496 | const Task* task) | |
1497 | { | |
1498 | typedef enum | |
1499 | { | |
1500 | NO_GROUP, | |
1501 | FINDING_STUB_SECTION, | |
1502 | HAS_STUB_SECTION | |
1503 | } State; | |
1504 | ||
1505 | std::vector<Output_relaxed_input_section*> new_relaxed_sections; | |
1506 | ||
1507 | State state = NO_GROUP; | |
1508 | section_size_type off = 0; | |
1509 | section_size_type group_begin_offset = 0; | |
1510 | section_size_type group_end_offset = 0; | |
1511 | section_size_type stub_table_end_offset = 0; | |
1512 | Input_section_list::const_iterator group_begin = | |
1513 | this->input_sections().end(); | |
1514 | Input_section_list::const_iterator stub_table = | |
1515 | this->input_sections().end(); | |
1516 | Input_section_list::const_iterator group_end = this->input_sections().end(); | |
1517 | for (Input_section_list::const_iterator p = this->input_sections().begin(); | |
1518 | p != this->input_sections().end(); | |
1519 | ++p) | |
1520 | { | |
1521 | section_size_type section_begin_offset = | |
1522 | align_address(off, p->addralign()); | |
1523 | section_size_type section_end_offset = | |
1524 | section_begin_offset + p->data_size(); | |
1525 | ||
1526 | // Check to see if we should group the previously seen sections. | |
1527 | switch (state) | |
1528 | { | |
1529 | case NO_GROUP: | |
1530 | break; | |
1531 | ||
1532 | case FINDING_STUB_SECTION: | |
1533 | // Adding this section makes the group larger than GROUP_SIZE. | |
1534 | if (section_end_offset - group_begin_offset >= group_size) | |
1535 | { | |
1536 | if (stubs_always_after_branch) | |
1537 | { | |
1538 | gold_assert(group_end != this->input_sections().end()); | |
1539 | this->create_stub_group(group_begin, group_end, group_end, | |
1540 | target, new_relaxed_sections, | |
1541 | task); | |
1542 | state = NO_GROUP; | |
1543 | } | |
1544 | else | |
1545 | { | |
1546 | // Input sections up to stub_group_size bytes after the stub | |
1547 | // table can be handled by it too. | |
1548 | state = HAS_STUB_SECTION; | |
1549 | stub_table = group_end; | |
1550 | stub_table_end_offset = group_end_offset; | |
1551 | } | |
1552 | } | |
1553 | break; | |
1554 | ||
1555 | case HAS_STUB_SECTION: | |
1556 | // Adding this section makes the post stub-section group larger | |
1557 | // than GROUP_SIZE. | |
1558 | gold_unreachable(); | |
1559 | // NOT SUPPORTED YET. For completeness only. | |
1560 | if (section_end_offset - stub_table_end_offset >= group_size) | |
1561 | { | |
1562 | gold_assert(group_end != this->input_sections().end()); | |
1563 | this->create_stub_group(group_begin, group_end, stub_table, | |
1564 | target, new_relaxed_sections, task); | |
1565 | state = NO_GROUP; | |
1566 | } | |
1567 | break; | |
1568 | ||
1569 | default: | |
1570 | gold_unreachable(); | |
1571 | } | |
1572 | ||
1573 | // If we see an input section and currently there is no group, start | |
1574 | // a new one. Skip any empty sections. We look at the data size | |
1575 | // instead of calling p->relobj()->section_size() to avoid locking. | |
1576 | if ((p->is_input_section() || p->is_relaxed_input_section()) | |
1577 | && (p->data_size() != 0)) | |
1578 | { | |
1579 | if (state == NO_GROUP) | |
1580 | { | |
1581 | state = FINDING_STUB_SECTION; | |
1582 | group_begin = p; | |
1583 | group_begin_offset = section_begin_offset; | |
1584 | } | |
1585 | ||
1586 | // Keep track of the last input section seen. | |
1587 | group_end = p; | |
1588 | group_end_offset = section_end_offset; | |
1589 | } | |
1590 | ||
1591 | off = section_end_offset; | |
1592 | } | |
1593 | ||
1594 | // Create a stub group for any ungrouped sections. | |
1595 | if (state == FINDING_STUB_SECTION || state == HAS_STUB_SECTION) | |
1596 | { | |
1597 | gold_assert(group_end != this->input_sections().end()); | |
1598 | this->create_stub_group(group_begin, group_end, | |
1599 | (state == FINDING_STUB_SECTION | |
1600 | ? group_end | |
1601 | : stub_table), | |
1602 | target, new_relaxed_sections, task); | |
1603 | } | |
8e33481e | 1604 | |
83a01957 HS |
1605 | if (!new_relaxed_sections.empty()) |
1606 | this->convert_input_sections_to_relaxed_sections(new_relaxed_sections); | |
1607 | ||
1608 | // Update the section offsets | |
1609 | for (size_t i = 0; i < new_relaxed_sections.size(); ++i) | |
1610 | { | |
1611 | The_aarch64_relobj* relobj = static_cast<The_aarch64_relobj*>( | |
1612 | new_relaxed_sections[i]->relobj()); | |
1613 | unsigned int shndx = new_relaxed_sections[i]->shndx(); | |
1614 | // Tell AArch64_relobj that this input section is converted. | |
1615 | relobj->convert_input_section_to_relaxed_section(shndx); | |
1616 | } | |
1617 | } // End of AArch64_output_section::group_sections | |
3a531937 | 1618 | |
053a4d68 | 1619 | |
9363c7c3 JY |
1620 | AArch64_reloc_property_table* aarch64_reloc_property_table = NULL; |
1621 | ||
3a531937 | 1622 | |
053a4d68 JY |
1623 | // The aarch64 target class. |
1624 | // See the ABI at | |
1625 | // http://infocenter.arm.com/help/topic/com.arm.doc.ihi0056b/IHI0056B_aaelf64.pdf | |
1626 | template<int size, bool big_endian> | |
1627 | class Target_aarch64 : public Sized_target<size, big_endian> | |
1628 | { | |
1629 | public: | |
83a01957 | 1630 | typedef Target_aarch64<size, big_endian> This; |
053a4d68 JY |
1631 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
1632 | Reloc_section; | |
83a01957 | 1633 | typedef Relocate_info<size, big_endian> The_relocate_info; |
053a4d68 | 1634 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; |
83a01957 HS |
1635 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; |
1636 | typedef Reloc_stub<size, big_endian> The_reloc_stub; | |
1637 | typedef typename The_reloc_stub::Stub_type The_reloc_stub_type; | |
1638 | typedef typename Reloc_stub<size, big_endian>::Key The_reloc_stub_key; | |
1639 | typedef Stub_table<size, big_endian> The_stub_table; | |
1640 | typedef std::vector<The_stub_table*> Stub_table_list; | |
1641 | typedef typename Stub_table_list::iterator Stub_table_iterator; | |
1642 | typedef AArch64_input_section<size, big_endian> The_aarch64_input_section; | |
1643 | typedef AArch64_output_section<size, big_endian> The_aarch64_output_section; | |
1644 | typedef Unordered_map<Section_id, | |
1645 | AArch64_input_section<size, big_endian>*, | |
1646 | Section_id_hash> AArch64_input_section_map; | |
8e33481e | 1647 | const static int TCB_SIZE = size / 8 * 2; |
053a4d68 JY |
1648 | |
1649 | Target_aarch64(const Target::Target_info* info = &aarch64_info) | |
1650 | : Sized_target<size, big_endian>(info), | |
3a531937 JY |
1651 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
1652 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
1653 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_AARCH64_COPY), | |
83a01957 HS |
1654 | got_mod_index_offset_(-1U), |
1655 | tlsdesc_reloc_info_(), tls_base_symbol_defined_(false), | |
0bf32ea9 | 1656 | stub_tables_(), stub_group_size_(0), aarch64_input_section_map_() |
053a4d68 JY |
1657 | { } |
1658 | ||
1659 | // Scan the relocations to determine unreferenced sections for | |
1660 | // garbage collection. | |
1661 | void | |
1662 | gc_process_relocs(Symbol_table* symtab, | |
1663 | Layout* layout, | |
1664 | Sized_relobj_file<size, big_endian>* object, | |
1665 | unsigned int data_shndx, | |
1666 | unsigned int sh_type, | |
1667 | const unsigned char* prelocs, | |
1668 | size_t reloc_count, | |
1669 | Output_section* output_section, | |
1670 | bool needs_special_offset_handling, | |
1671 | size_t local_symbol_count, | |
1672 | const unsigned char* plocal_symbols); | |
1673 | ||
1674 | // Scan the relocations to look for symbol adjustments. | |
1675 | void | |
1676 | scan_relocs(Symbol_table* symtab, | |
1677 | Layout* layout, | |
1678 | Sized_relobj_file<size, big_endian>* object, | |
1679 | unsigned int data_shndx, | |
1680 | unsigned int sh_type, | |
1681 | const unsigned char* prelocs, | |
1682 | size_t reloc_count, | |
1683 | Output_section* output_section, | |
1684 | bool needs_special_offset_handling, | |
1685 | size_t local_symbol_count, | |
1686 | const unsigned char* plocal_symbols); | |
1687 | ||
1688 | // Finalize the sections. | |
1689 | void | |
1690 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); | |
1691 | ||
3a531937 JY |
1692 | // Return the value to use for a dynamic which requires special |
1693 | // treatment. | |
1694 | uint64_t | |
1695 | do_dynsym_value(const Symbol*) const; | |
1696 | ||
053a4d68 JY |
1697 | // Relocate a section. |
1698 | void | |
1699 | relocate_section(const Relocate_info<size, big_endian>*, | |
1700 | unsigned int sh_type, | |
1701 | const unsigned char* prelocs, | |
1702 | size_t reloc_count, | |
1703 | Output_section* output_section, | |
1704 | bool needs_special_offset_handling, | |
1705 | unsigned char* view, | |
1706 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
1707 | section_size_type view_size, | |
1708 | const Reloc_symbol_changes*); | |
1709 | ||
1710 | // Scan the relocs during a relocatable link. | |
1711 | void | |
1712 | scan_relocatable_relocs(Symbol_table* symtab, | |
1713 | Layout* layout, | |
1714 | Sized_relobj_file<size, big_endian>* object, | |
1715 | unsigned int data_shndx, | |
1716 | unsigned int sh_type, | |
1717 | const unsigned char* prelocs, | |
1718 | size_t reloc_count, | |
1719 | Output_section* output_section, | |
1720 | bool needs_special_offset_handling, | |
1721 | size_t local_symbol_count, | |
1722 | const unsigned char* plocal_symbols, | |
1723 | Relocatable_relocs*); | |
1724 | ||
1725 | // Relocate a section during a relocatable link. | |
1726 | void | |
1727 | relocate_relocs( | |
1728 | const Relocate_info<size, big_endian>*, | |
1729 | unsigned int sh_type, | |
1730 | const unsigned char* prelocs, | |
1731 | size_t reloc_count, | |
1732 | Output_section* output_section, | |
1733 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, | |
1734 | const Relocatable_relocs*, | |
1735 | unsigned char* view, | |
1736 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
1737 | section_size_type view_size, | |
1738 | unsigned char* reloc_view, | |
1739 | section_size_type reloc_view_size); | |
1740 | ||
3a531937 JY |
1741 | // Return the symbol index to use for a target specific relocation. |
1742 | // The only target specific relocation is R_AARCH64_TLSDESC for a | |
1743 | // local symbol, which is an absolute reloc. | |
1744 | unsigned int | |
1745 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
1746 | { | |
1747 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); | |
1748 | return 0; | |
1749 | } | |
1750 | ||
1751 | // Return the addend to use for a target specific relocation. | |
7fa5525f RÁE |
1752 | uint64_t |
1753 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
3a531937 | 1754 | |
9363c7c3 JY |
1755 | // Return the PLT section. |
1756 | uint64_t | |
1757 | do_plt_address_for_global(const Symbol* gsym) const | |
1758 | { return this->plt_section()->address_for_global(gsym); } | |
1759 | ||
1760 | uint64_t | |
1761 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
1762 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
1763 | ||
9726c3c1 HS |
1764 | // This function should be defined in targets that can use relocation |
1765 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
1766 | // and global_reloc_may_be_function_pointer) | |
1767 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
1768 | // fold those functions whose pointer is defintely not taken. | |
1769 | bool | |
1770 | do_can_check_for_function_pointers() const | |
1771 | { return true; } | |
1772 | ||
053a4d68 JY |
1773 | // Return the number of entries in the PLT. |
1774 | unsigned int | |
1775 | plt_entry_count() const; | |
1776 | ||
1777 | //Return the offset of the first non-reserved PLT entry. | |
1778 | unsigned int | |
1779 | first_plt_entry_offset() const; | |
1780 | ||
1781 | // Return the size of each PLT entry. | |
1782 | unsigned int | |
1783 | plt_entry_size() const; | |
1784 | ||
83a01957 HS |
1785 | // Create a stub table. |
1786 | The_stub_table* | |
1787 | new_stub_table(The_aarch64_input_section*); | |
1788 | ||
1789 | // Create an aarch64 input section. | |
1790 | The_aarch64_input_section* | |
1791 | new_aarch64_input_section(Relobj*, unsigned int); | |
1792 | ||
1793 | // Find an aarch64 input section instance for a given OBJ and SHNDX. | |
1794 | The_aarch64_input_section* | |
1795 | find_aarch64_input_section(Relobj*, unsigned int) const; | |
1796 | ||
1797 | // Return the thread control block size. | |
8e33481e HS |
1798 | unsigned int |
1799 | tcb_size() const { return This::TCB_SIZE; } | |
1800 | ||
83a01957 HS |
1801 | // Scan a section for stub generation. |
1802 | void | |
1803 | scan_section_for_stubs(const Relocate_info<size, big_endian>*, unsigned int, | |
1804 | const unsigned char*, size_t, Output_section*, | |
1805 | bool, const unsigned char*, | |
1806 | Address, | |
1807 | section_size_type); | |
1808 | ||
1809 | // Scan a relocation section for stub. | |
1810 | template<int sh_type> | |
1811 | void | |
1812 | scan_reloc_section_for_stubs( | |
1813 | const The_relocate_info* relinfo, | |
1814 | const unsigned char* prelocs, | |
1815 | size_t reloc_count, | |
1816 | Output_section* output_section, | |
1817 | bool needs_special_offset_handling, | |
1818 | const unsigned char* view, | |
1819 | Address view_address, | |
1820 | section_size_type); | |
1821 | ||
1822 | // Relocate a single stub. | |
1823 | void | |
1824 | relocate_stub(The_reloc_stub*, const Relocate_info<size, big_endian>*, | |
1825 | Output_section*, unsigned char*, Address, | |
1826 | section_size_type); | |
1827 | ||
1828 | // Get the default AArch64 target. | |
1829 | static This* | |
1830 | current_target() | |
1831 | { | |
1832 | gold_assert(parameters->target().machine_code() == elfcpp::EM_AARCH64 | |
1833 | && parameters->target().get_size() == size | |
1834 | && parameters->target().is_big_endian() == big_endian); | |
1835 | return static_cast<This*>(parameters->sized_target<size, big_endian>()); | |
1836 | } | |
1837 | ||
9363c7c3 JY |
1838 | protected: |
1839 | void | |
1840 | do_select_as_default_target() | |
1841 | { | |
1842 | gold_assert(aarch64_reloc_property_table == NULL); | |
1843 | aarch64_reloc_property_table = new AArch64_reloc_property_table(); | |
1844 | } | |
1845 | ||
3a531937 JY |
1846 | // Add a new reloc argument, returning the index in the vector. |
1847 | size_t | |
1848 | add_tlsdesc_info(Sized_relobj_file<size, big_endian>* object, | |
1849 | unsigned int r_sym) | |
1850 | { | |
1851 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
1852 | return this->tlsdesc_reloc_info_.size() - 1; | |
1853 | } | |
1854 | ||
9363c7c3 | 1855 | virtual Output_data_plt_aarch64<size, big_endian>* |
3a531937 JY |
1856 | do_make_data_plt(Layout* layout, |
1857 | Output_data_got_aarch64<size, big_endian>* got, | |
1858 | Output_data_space* got_plt, | |
1859 | Output_data_space* got_irelative) | |
9363c7c3 | 1860 | { |
3a531937 JY |
1861 | return new Output_data_plt_aarch64_standard<size, big_endian>( |
1862 | layout, got, got_plt, got_irelative); | |
9363c7c3 JY |
1863 | } |
1864 | ||
83a01957 HS |
1865 | |
1866 | // do_make_elf_object to override the same function in the base class. | |
1867 | Object* | |
1868 | do_make_elf_object(const std::string&, Input_file*, off_t, | |
1869 | const elfcpp::Ehdr<size, big_endian>&); | |
1870 | ||
9363c7c3 | 1871 | Output_data_plt_aarch64<size, big_endian>* |
3a531937 JY |
1872 | make_data_plt(Layout* layout, |
1873 | Output_data_got_aarch64<size, big_endian>* got, | |
1874 | Output_data_space* got_plt, | |
1875 | Output_data_space* got_irelative) | |
9363c7c3 | 1876 | { |
3a531937 | 1877 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); |
9363c7c3 JY |
1878 | } |
1879 | ||
83a01957 HS |
1880 | // We only need to generate stubs, and hence perform relaxation if we are |
1881 | // not doing relocatable linking. | |
1882 | virtual bool | |
1883 | do_may_relax() const | |
1884 | { return !parameters->options().relocatable(); } | |
1885 | ||
1886 | // Relaxation hook. This is where we do stub generation. | |
1887 | virtual bool | |
1888 | do_relax(int, const Input_objects*, Symbol_table*, Layout*, const Task*); | |
1889 | ||
1890 | void | |
1891 | group_sections(Layout* layout, | |
1892 | section_size_type group_size, | |
1893 | bool stubs_always_after_branch, | |
1894 | const Task* task); | |
1895 | ||
1896 | void | |
1897 | scan_reloc_for_stub(const The_relocate_info*, unsigned int, | |
1898 | const Sized_symbol<size>*, unsigned int, | |
1899 | const Symbol_value<size>*, | |
1900 | typename elfcpp::Elf_types<size>::Elf_Swxword, | |
1901 | Address Elf_Addr); | |
1902 | ||
1903 | // Make an output section. | |
1904 | Output_section* | |
1905 | do_make_output_section(const char* name, elfcpp::Elf_Word type, | |
1906 | elfcpp::Elf_Xword flags) | |
1907 | { return new The_aarch64_output_section(name, type, flags); } | |
1908 | ||
053a4d68 JY |
1909 | private: |
1910 | // The class which scans relocations. | |
1911 | class Scan | |
1912 | { | |
1913 | public: | |
1914 | Scan() | |
1915 | : issued_non_pic_error_(false) | |
1916 | { } | |
1917 | ||
053a4d68 JY |
1918 | inline void |
1919 | local(Symbol_table* symtab, Layout* layout, Target_aarch64* target, | |
1920 | Sized_relobj_file<size, big_endian>* object, | |
1921 | unsigned int data_shndx, | |
1922 | Output_section* output_section, | |
1923 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
1924 | const elfcpp::Sym<size, big_endian>& lsym, | |
1925 | bool is_discarded); | |
1926 | ||
1927 | inline void | |
1928 | global(Symbol_table* symtab, Layout* layout, Target_aarch64* target, | |
1929 | Sized_relobj_file<size, big_endian>* object, | |
1930 | unsigned int data_shndx, | |
1931 | Output_section* output_section, | |
1932 | const elfcpp::Rela<size, big_endian>& reloc, unsigned int r_type, | |
1933 | Symbol* gsym); | |
1934 | ||
1935 | inline bool | |
1936 | local_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
9363c7c3 JY |
1937 | Target_aarch64<size, big_endian>* , |
1938 | Sized_relobj_file<size, big_endian>* , | |
1939 | unsigned int , | |
1940 | Output_section* , | |
1941 | const elfcpp::Rela<size, big_endian>& , | |
1942 | unsigned int r_type, | |
1943 | const elfcpp::Sym<size, big_endian>&); | |
053a4d68 JY |
1944 | |
1945 | inline bool | |
1946 | global_reloc_may_be_function_pointer(Symbol_table* , Layout* , | |
9363c7c3 JY |
1947 | Target_aarch64<size, big_endian>* , |
1948 | Sized_relobj_file<size, big_endian>* , | |
1949 | unsigned int , | |
1950 | Output_section* , | |
1951 | const elfcpp::Rela<size, big_endian>& , | |
1952 | unsigned int r_type, | |
1953 | Symbol* gsym); | |
053a4d68 JY |
1954 | |
1955 | private: | |
1956 | static void | |
1957 | unsupported_reloc_local(Sized_relobj_file<size, big_endian>*, | |
1958 | unsigned int r_type); | |
1959 | ||
1960 | static void | |
1961 | unsupported_reloc_global(Sized_relobj_file<size, big_endian>*, | |
1962 | unsigned int r_type, Symbol*); | |
1963 | ||
1964 | inline bool | |
1965 | possible_function_pointer_reloc(unsigned int r_type); | |
1966 | ||
1967 | void | |
1968 | check_non_pic(Relobj*, unsigned int r_type); | |
1969 | ||
9726c3c1 HS |
1970 | bool |
1971 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, big_endian>*, | |
1972 | unsigned int r_type); | |
1973 | ||
053a4d68 JY |
1974 | // Whether we have issued an error about a non-PIC compilation. |
1975 | bool issued_non_pic_error_; | |
1976 | }; | |
1977 | ||
1978 | // The class which implements relocation. | |
1979 | class Relocate | |
1980 | { | |
1981 | public: | |
1982 | Relocate() | |
3a531937 | 1983 | : skip_call_tls_get_addr_(false) |
053a4d68 JY |
1984 | { } |
1985 | ||
1986 | ~Relocate() | |
1987 | { } | |
1988 | ||
1989 | // Do a relocation. Return false if the caller should not issue | |
1990 | // any warnings about this relocation. | |
1991 | inline bool | |
1992 | relocate(const Relocate_info<size, big_endian>*, Target_aarch64*, | |
1993 | Output_section*, | |
1994 | size_t relnum, const elfcpp::Rela<size, big_endian>&, | |
1995 | unsigned int r_type, const Sized_symbol<size>*, | |
1996 | const Symbol_value<size>*, | |
1997 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
1998 | section_size_type); | |
1999 | ||
8e33481e | 2000 | private: |
83a01957 HS |
2001 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
2002 | relocate_tls(const Relocate_info<size, big_endian>*, | |
8e33481e HS |
2003 | Target_aarch64<size, big_endian>*, |
2004 | size_t, | |
2005 | const elfcpp::Rela<size, big_endian>&, | |
2006 | unsigned int r_type, const Sized_symbol<size>*, | |
2007 | const Symbol_value<size>*, | |
2008 | unsigned char*, | |
2009 | typename elfcpp::Elf_types<size>::Elf_Addr); | |
2010 | ||
83a01957 | 2011 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 2012 | tls_gd_to_le( |
83a01957 | 2013 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
2014 | Target_aarch64<size, big_endian>*, |
2015 | const elfcpp::Rela<size, big_endian>&, | |
2016 | unsigned int, | |
2017 | unsigned char*, | |
2018 | const Symbol_value<size>*); | |
2019 | ||
9726c3c1 HS |
2020 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
2021 | tls_ld_to_le( | |
2022 | const Relocate_info<size, big_endian>*, | |
2023 | Target_aarch64<size, big_endian>*, | |
2024 | const elfcpp::Rela<size, big_endian>&, | |
2025 | unsigned int, | |
2026 | unsigned char*, | |
2027 | const Symbol_value<size>*); | |
2028 | ||
83a01957 | 2029 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 2030 | tls_ie_to_le( |
83a01957 | 2031 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
2032 | Target_aarch64<size, big_endian>*, |
2033 | const elfcpp::Rela<size, big_endian>&, | |
2034 | unsigned int, | |
2035 | unsigned char*, | |
2036 | const Symbol_value<size>*); | |
2037 | ||
83a01957 | 2038 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 2039 | tls_desc_gd_to_le( |
83a01957 | 2040 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
2041 | Target_aarch64<size, big_endian>*, |
2042 | const elfcpp::Rela<size, big_endian>&, | |
2043 | unsigned int, | |
2044 | unsigned char*, | |
2045 | const Symbol_value<size>*); | |
2046 | ||
83a01957 | 2047 | inline typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 2048 | tls_desc_gd_to_ie( |
83a01957 | 2049 | const Relocate_info<size, big_endian>*, |
3a531937 JY |
2050 | Target_aarch64<size, big_endian>*, |
2051 | const elfcpp::Rela<size, big_endian>&, | |
2052 | unsigned int, | |
2053 | unsigned char*, | |
2054 | const Symbol_value<size>*, | |
2055 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
2056 | typename elfcpp::Elf_types<size>::Elf_Addr); | |
2057 | ||
2058 | bool skip_call_tls_get_addr_; | |
2059 | ||
8e33481e | 2060 | }; // End of class Relocate |
053a4d68 JY |
2061 | |
2062 | // A class which returns the size required for a relocation type, | |
2063 | // used while scanning relocs during a relocatable link. | |
2064 | class Relocatable_size_for_reloc | |
2065 | { | |
2066 | public: | |
2067 | unsigned int | |
2068 | get_size_for_reloc(unsigned int, Relobj*); | |
2069 | }; | |
2070 | ||
2071 | // Adjust TLS relocation type based on the options and whether this | |
2072 | // is a local symbol. | |
2073 | static tls::Tls_optimization | |
2074 | optimize_tls_reloc(bool is_final, int r_type); | |
2075 | ||
2076 | // Get the GOT section, creating it if necessary. | |
2077 | Output_data_got_aarch64<size, big_endian>* | |
2078 | got_section(Symbol_table*, Layout*); | |
2079 | ||
2080 | // Get the GOT PLT section. | |
2081 | Output_data_space* | |
2082 | got_plt_section() const | |
2083 | { | |
2084 | gold_assert(this->got_plt_ != NULL); | |
2085 | return this->got_plt_; | |
2086 | } | |
2087 | ||
3a531937 JY |
2088 | // Get the GOT section for TLSDESC entries. |
2089 | Output_data_got<size, big_endian>* | |
2090 | got_tlsdesc_section() const | |
2091 | { | |
2092 | gold_assert(this->got_tlsdesc_ != NULL); | |
2093 | return this->got_tlsdesc_; | |
2094 | } | |
2095 | ||
053a4d68 JY |
2096 | // Create the PLT section. |
2097 | void | |
2098 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
2099 | ||
2100 | // Create a PLT entry for a global symbol. | |
2101 | void | |
2102 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
2103 | ||
3a531937 JY |
2104 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
2105 | void | |
2106 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
2107 | Sized_relobj_file<size, big_endian>* relobj, | |
2108 | unsigned int local_sym_index); | |
2109 | ||
2110 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. | |
2111 | void | |
2112 | define_tls_base_symbol(Symbol_table*, Layout*); | |
2113 | ||
2114 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. | |
2115 | void | |
2116 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
2117 | ||
2118 | // Create a GOT entry for the TLS module index. | |
2119 | unsigned int | |
2120 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
2121 | Sized_relobj_file<size, big_endian>* object); | |
2122 | ||
053a4d68 JY |
2123 | // Get the PLT section. |
2124 | Output_data_plt_aarch64<size, big_endian>* | |
2125 | plt_section() const | |
2126 | { | |
2127 | gold_assert(this->plt_ != NULL); | |
2128 | return this->plt_; | |
2129 | } | |
2130 | ||
2131 | // Get the dynamic reloc section, creating it if necessary. | |
2132 | Reloc_section* | |
2133 | rela_dyn_section(Layout*); | |
2134 | ||
3a531937 JY |
2135 | // Get the section to use for TLSDESC relocations. |
2136 | Reloc_section* | |
2137 | rela_tlsdesc_section(Layout*) const; | |
2138 | ||
2139 | // Get the section to use for IRELATIVE relocations. | |
2140 | Reloc_section* | |
2141 | rela_irelative_section(Layout*); | |
2142 | ||
053a4d68 JY |
2143 | // Add a potential copy relocation. |
2144 | void | |
2145 | copy_reloc(Symbol_table* symtab, Layout* layout, | |
2146 | Sized_relobj_file<size, big_endian>* object, | |
2147 | unsigned int shndx, Output_section* output_section, | |
2148 | Symbol* sym, const elfcpp::Rela<size, big_endian>& reloc) | |
2149 | { | |
2150 | this->copy_relocs_.copy_reloc(symtab, layout, | |
2151 | symtab->get_sized_symbol<size>(sym), | |
2152 | object, shndx, output_section, | |
2153 | reloc, this->rela_dyn_section(layout)); | |
2154 | } | |
2155 | ||
2156 | // Information about this specific target which we pass to the | |
2157 | // general Target structure. | |
2158 | static const Target::Target_info aarch64_info; | |
2159 | ||
2160 | // The types of GOT entries needed for this platform. | |
2161 | // These values are exposed to the ABI in an incremental link. | |
2162 | // Do not renumber existing values without changing the version | |
2163 | // number of the .gnu_incremental_inputs section. | |
2164 | enum Got_type | |
2165 | { | |
2166 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
2167 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
2168 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
2169 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
2170 | }; | |
2171 | ||
3a531937 JY |
2172 | // This type is used as the argument to the target specific |
2173 | // relocation routines. The only target specific reloc is | |
2174 | // R_AARCh64_TLSDESC against a local symbol. | |
2175 | struct Tlsdesc_info | |
2176 | { | |
2177 | Tlsdesc_info(Sized_relobj_file<size, big_endian>* a_object, | |
2178 | unsigned int a_r_sym) | |
2179 | : object(a_object), r_sym(a_r_sym) | |
2180 | { } | |
2181 | ||
2182 | // The object in which the local symbol is defined. | |
2183 | Sized_relobj_file<size, big_endian>* object; | |
2184 | // The local symbol index in the object. | |
2185 | unsigned int r_sym; | |
2186 | }; | |
2187 | ||
053a4d68 JY |
2188 | // The GOT section. |
2189 | Output_data_got_aarch64<size, big_endian>* got_; | |
2190 | // The PLT section. | |
2191 | Output_data_plt_aarch64<size, big_endian>* plt_; | |
2192 | // The GOT PLT section. | |
2193 | Output_data_space* got_plt_; | |
3a531937 JY |
2194 | // The GOT section for IRELATIVE relocations. |
2195 | Output_data_space* got_irelative_; | |
2196 | // The GOT section for TLSDESC relocations. | |
2197 | Output_data_got<size, big_endian>* got_tlsdesc_; | |
053a4d68 JY |
2198 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
2199 | Symbol* global_offset_table_; | |
2200 | // The dynamic reloc section. | |
2201 | Reloc_section* rela_dyn_; | |
3a531937 JY |
2202 | // The section to use for IRELATIVE relocs. |
2203 | Reloc_section* rela_irelative_; | |
053a4d68 JY |
2204 | // Relocs saved to avoid a COPY reloc. |
2205 | Copy_relocs<elfcpp::SHT_RELA, size, big_endian> copy_relocs_; | |
3a531937 JY |
2206 | // Offset of the GOT entry for the TLS module index. |
2207 | unsigned int got_mod_index_offset_; | |
2208 | // We handle R_AARCH64_TLSDESC against a local symbol as a target | |
2209 | // specific relocation. Here we store the object and local symbol | |
2210 | // index for the relocation. | |
2211 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
2212 | // True if the _TLS_MODULE_BASE_ symbol has been defined. | |
2213 | bool tls_base_symbol_defined_; | |
83a01957 HS |
2214 | // List of stub_tables |
2215 | Stub_table_list stub_tables_; | |
0bf32ea9 JY |
2216 | // Actual stub group size |
2217 | section_size_type stub_group_size_; | |
83a01957 | 2218 | AArch64_input_section_map aarch64_input_section_map_; |
8e33481e | 2219 | }; // End of Target_aarch64 |
053a4d68 | 2220 | |
3a531937 | 2221 | |
053a4d68 JY |
2222 | template<> |
2223 | const Target::Target_info Target_aarch64<64, false>::aarch64_info = | |
2224 | { | |
2225 | 64, // size | |
2226 | false, // is_big_endian | |
2227 | elfcpp::EM_AARCH64, // machine_code | |
2228 | false, // has_make_symbol | |
2229 | false, // has_resolve | |
2230 | false, // has_code_fill | |
2231 | true, // is_default_stack_executable | |
9726c3c1 | 2232 | true, // can_icf_inline_merge_sections |
053a4d68 JY |
2233 | '\0', // wrap_char |
2234 | "/lib/ld.so.1", // program interpreter | |
2235 | 0x400000, // default_text_segment_address | |
2236 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
2237 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2238 | false, // isolate_execinstr | |
2239 | 0, // rosegment_gap | |
2240 | elfcpp::SHN_UNDEF, // small_common_shndx | |
2241 | elfcpp::SHN_UNDEF, // large_common_shndx | |
2242 | 0, // small_common_section_flags | |
2243 | 0, // large_common_section_flags | |
2244 | NULL, // attributes_section | |
2245 | NULL, // attributes_vendor | |
2246 | "_start" // entry_symbol_name | |
2247 | }; | |
2248 | ||
2249 | template<> | |
2250 | const Target::Target_info Target_aarch64<32, false>::aarch64_info = | |
2251 | { | |
2252 | 32, // size | |
2253 | false, // is_big_endian | |
2254 | elfcpp::EM_AARCH64, // machine_code | |
2255 | false, // has_make_symbol | |
2256 | false, // has_resolve | |
2257 | false, // has_code_fill | |
2258 | true, // is_default_stack_executable | |
2259 | false, // can_icf_inline_merge_sections | |
2260 | '\0', // wrap_char | |
2261 | "/lib/ld.so.1", // program interpreter | |
2262 | 0x400000, // default_text_segment_address | |
2263 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
2264 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2265 | false, // isolate_execinstr | |
2266 | 0, // rosegment_gap | |
2267 | elfcpp::SHN_UNDEF, // small_common_shndx | |
2268 | elfcpp::SHN_UNDEF, // large_common_shndx | |
2269 | 0, // small_common_section_flags | |
2270 | 0, // large_common_section_flags | |
2271 | NULL, // attributes_section | |
2272 | NULL, // attributes_vendor | |
2273 | "_start" // entry_symbol_name | |
2274 | }; | |
2275 | ||
2276 | template<> | |
2277 | const Target::Target_info Target_aarch64<64, true>::aarch64_info = | |
2278 | { | |
2279 | 64, // size | |
2280 | true, // is_big_endian | |
2281 | elfcpp::EM_AARCH64, // machine_code | |
2282 | false, // has_make_symbol | |
2283 | false, // has_resolve | |
2284 | false, // has_code_fill | |
2285 | true, // is_default_stack_executable | |
9726c3c1 | 2286 | true, // can_icf_inline_merge_sections |
053a4d68 JY |
2287 | '\0', // wrap_char |
2288 | "/lib/ld.so.1", // program interpreter | |
2289 | 0x400000, // default_text_segment_address | |
2290 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
2291 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2292 | false, // isolate_execinstr | |
2293 | 0, // rosegment_gap | |
2294 | elfcpp::SHN_UNDEF, // small_common_shndx | |
2295 | elfcpp::SHN_UNDEF, // large_common_shndx | |
2296 | 0, // small_common_section_flags | |
2297 | 0, // large_common_section_flags | |
2298 | NULL, // attributes_section | |
2299 | NULL, // attributes_vendor | |
2300 | "_start" // entry_symbol_name | |
2301 | }; | |
2302 | ||
2303 | template<> | |
2304 | const Target::Target_info Target_aarch64<32, true>::aarch64_info = | |
2305 | { | |
2306 | 32, // size | |
2307 | true, // is_big_endian | |
2308 | elfcpp::EM_AARCH64, // machine_code | |
2309 | false, // has_make_symbol | |
2310 | false, // has_resolve | |
2311 | false, // has_code_fill | |
2312 | true, // is_default_stack_executable | |
2313 | false, // can_icf_inline_merge_sections | |
2314 | '\0', // wrap_char | |
2315 | "/lib/ld.so.1", // program interpreter | |
2316 | 0x400000, // default_text_segment_address | |
2317 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
2318 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2319 | false, // isolate_execinstr | |
2320 | 0, // rosegment_gap | |
2321 | elfcpp::SHN_UNDEF, // small_common_shndx | |
2322 | elfcpp::SHN_UNDEF, // large_common_shndx | |
2323 | 0, // small_common_section_flags | |
2324 | 0, // large_common_section_flags | |
2325 | NULL, // attributes_section | |
2326 | NULL, // attributes_vendor | |
2327 | "_start" // entry_symbol_name | |
2328 | }; | |
2329 | ||
2330 | // Get the GOT section, creating it if necessary. | |
2331 | ||
2332 | template<int size, bool big_endian> | |
2333 | Output_data_got_aarch64<size, big_endian>* | |
2334 | Target_aarch64<size, big_endian>::got_section(Symbol_table* symtab, | |
9363c7c3 | 2335 | Layout* layout) |
053a4d68 JY |
2336 | { |
2337 | if (this->got_ == NULL) | |
2338 | { | |
2339 | gold_assert(symtab != NULL && layout != NULL); | |
2340 | ||
2341 | // When using -z now, we can treat .got.plt as a relro section. | |
2342 | // Without -z now, it is modified after program startup by lazy | |
2343 | // PLT relocations. | |
2344 | bool is_got_plt_relro = parameters->options().now(); | |
2345 | Output_section_order got_order = (is_got_plt_relro | |
2346 | ? ORDER_RELRO | |
2347 | : ORDER_RELRO_LAST); | |
2348 | Output_section_order got_plt_order = (is_got_plt_relro | |
2349 | ? ORDER_RELRO | |
2350 | : ORDER_NON_RELRO_FIRST); | |
2351 | ||
2352 | // Layout of .got and .got.plt sections. | |
2353 | // .got[0] &_DYNAMIC <-_GLOBAL_OFFSET_TABLE_ | |
2354 | // ... | |
2355 | // .gotplt[0] reserved for ld.so (&linkmap) <--DT_PLTGOT | |
2356 | // .gotplt[1] reserved for ld.so (resolver) | |
2357 | // .gotplt[2] reserved | |
2358 | ||
2359 | // Generate .got section. | |
2360 | this->got_ = new Output_data_got_aarch64<size, big_endian>(symtab, | |
9363c7c3 | 2361 | layout); |
053a4d68 | 2362 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
9363c7c3 JY |
2363 | (elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE), |
2364 | this->got_, got_order, true); | |
053a4d68 JY |
2365 | // The first word of GOT is reserved for the address of .dynamic. |
2366 | // We put 0 here now. The value will be replaced later in | |
2367 | // Output_data_got_aarch64::do_write. | |
2368 | this->got_->add_constant(0); | |
2369 | ||
2370 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
2371 | // _GLOBAL_OFFSET_TABLE_ value points to the start of the .got section, | |
2372 | // even if there is a .got.plt section. | |
2373 | this->global_offset_table_ = | |
9363c7c3 JY |
2374 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2375 | Symbol_table::PREDEFINED, | |
2376 | this->got_, | |
2377 | 0, 0, elfcpp::STT_OBJECT, | |
2378 | elfcpp::STB_LOCAL, | |
2379 | elfcpp::STV_HIDDEN, 0, | |
2380 | false, false); | |
053a4d68 JY |
2381 | |
2382 | // Generate .got.plt section. | |
2383 | this->got_plt_ = new Output_data_space(size / 8, "** GOT PLT"); | |
2384 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
9363c7c3 JY |
2385 | (elfcpp::SHF_ALLOC |
2386 | | elfcpp::SHF_WRITE), | |
2387 | this->got_plt_, got_plt_order, | |
2388 | is_got_plt_relro); | |
053a4d68 JY |
2389 | |
2390 | // The first three entries are reserved. | |
9363c7c3 JY |
2391 | this->got_plt_->set_current_data_size( |
2392 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); | |
053a4d68 | 2393 | |
3a531937 JY |
2394 | // If there are any IRELATIVE relocations, they get GOT entries |
2395 | // in .got.plt after the jump slot entries. | |
2396 | this->got_irelative_ = new Output_data_space(size / 8, | |
2397 | "** GOT IRELATIVE PLT"); | |
2398 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
2399 | (elfcpp::SHF_ALLOC | |
2400 | | elfcpp::SHF_WRITE), | |
2401 | this->got_irelative_, | |
2402 | got_plt_order, | |
2403 | is_got_plt_relro); | |
2404 | ||
2405 | // If there are any TLSDESC relocations, they get GOT entries in | |
2406 | // .got.plt after the jump slot and IRELATIVE entries. | |
2407 | this->got_tlsdesc_ = new Output_data_got<size, big_endian>(); | |
2408 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
2409 | (elfcpp::SHF_ALLOC | |
2410 | | elfcpp::SHF_WRITE), | |
2411 | this->got_tlsdesc_, | |
2412 | got_plt_order, | |
2413 | is_got_plt_relro); | |
2414 | ||
053a4d68 | 2415 | if (!is_got_plt_relro) |
9363c7c3 JY |
2416 | { |
2417 | // Those bytes can go into the relro segment. | |
2418 | layout->increase_relro( | |
2419 | AARCH64_GOTPLT_RESERVE_COUNT * (size / 8)); | |
2420 | } | |
053a4d68 JY |
2421 | |
2422 | } | |
2423 | return this->got_; | |
2424 | } | |
2425 | ||
2426 | // Get the dynamic reloc section, creating it if necessary. | |
2427 | ||
2428 | template<int size, bool big_endian> | |
2429 | typename Target_aarch64<size, big_endian>::Reloc_section* | |
2430 | Target_aarch64<size, big_endian>::rela_dyn_section(Layout* layout) | |
2431 | { | |
2432 | if (this->rela_dyn_ == NULL) | |
2433 | { | |
2434 | gold_assert(layout != NULL); | |
2435 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); | |
2436 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
2437 | elfcpp::SHF_ALLOC, this->rela_dyn_, | |
2438 | ORDER_DYNAMIC_RELOCS, false); | |
2439 | } | |
2440 | return this->rela_dyn_; | |
2441 | } | |
2442 | ||
3a531937 JY |
2443 | // Get the section to use for IRELATIVE relocs, creating it if |
2444 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
2445 | // relocations. They need to follow the other dynamic relocations so | |
2446 | // that they can refer to global variables initialized by those | |
2447 | // relocs. | |
2448 | ||
2449 | template<int size, bool big_endian> | |
2450 | typename Target_aarch64<size, big_endian>::Reloc_section* | |
2451 | Target_aarch64<size, big_endian>::rela_irelative_section(Layout* layout) | |
2452 | { | |
2453 | if (this->rela_irelative_ == NULL) | |
2454 | { | |
2455 | // Make sure we have already created the dynamic reloc section. | |
2456 | this->rela_dyn_section(layout); | |
2457 | this->rela_irelative_ = new Reloc_section(false); | |
2458 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
2459 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
2460 | ORDER_DYNAMIC_RELOCS, false); | |
2461 | gold_assert(this->rela_dyn_->output_section() | |
2462 | == this->rela_irelative_->output_section()); | |
2463 | } | |
2464 | return this->rela_irelative_; | |
2465 | } | |
2466 | ||
2467 | ||
83a01957 HS |
2468 | // do_make_elf_object to override the same function in the base class. We need |
2469 | // to use a target-specific sub-class of Sized_relobj_file<size, big_endian> to | |
2470 | // store backend specific information. Hence we need to have our own ELF object | |
2471 | // creation. | |
2472 | ||
2473 | template<int size, bool big_endian> | |
2474 | Object* | |
2475 | Target_aarch64<size, big_endian>::do_make_elf_object( | |
2476 | const std::string& name, | |
2477 | Input_file* input_file, | |
2478 | off_t offset, const elfcpp::Ehdr<size, big_endian>& ehdr) | |
2479 | { | |
2480 | int et = ehdr.get_e_type(); | |
2481 | // ET_EXEC files are valid input for --just-symbols/-R, | |
2482 | // and we treat them as relocatable objects. | |
2483 | if (et == elfcpp::ET_EXEC && input_file->just_symbols()) | |
2484 | return Sized_target<size, big_endian>::do_make_elf_object( | |
2485 | name, input_file, offset, ehdr); | |
2486 | else if (et == elfcpp::ET_REL) | |
2487 | { | |
2488 | AArch64_relobj<size, big_endian>* obj = | |
2489 | new AArch64_relobj<size, big_endian>(name, input_file, offset, ehdr); | |
2490 | obj->setup(); | |
2491 | return obj; | |
2492 | } | |
2493 | else if (et == elfcpp::ET_DYN) | |
2494 | { | |
2495 | // Keep base implementation. | |
2496 | Sized_dynobj<size, big_endian>* obj = | |
2497 | new Sized_dynobj<size, big_endian>(name, input_file, offset, ehdr); | |
2498 | obj->setup(); | |
2499 | return obj; | |
2500 | } | |
2501 | else | |
2502 | { | |
2503 | gold_error(_("%s: unsupported ELF file type %d"), | |
2504 | name.c_str(), et); | |
2505 | return NULL; | |
2506 | } | |
2507 | } | |
2508 | ||
2509 | ||
2510 | // Scan a relocation for stub generation. | |
2511 | ||
2512 | template<int size, bool big_endian> | |
2513 | void | |
2514 | Target_aarch64<size, big_endian>::scan_reloc_for_stub( | |
2515 | const Relocate_info<size, big_endian>* relinfo, | |
2516 | unsigned int r_type, | |
2517 | const Sized_symbol<size>* gsym, | |
2518 | unsigned int r_sym, | |
2519 | const Symbol_value<size>* psymval, | |
2520 | typename elfcpp::Elf_types<size>::Elf_Swxword addend, | |
2521 | Address address) | |
2522 | { | |
2523 | const AArch64_relobj<size, big_endian>* aarch64_relobj = | |
2524 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); | |
2525 | ||
2526 | Symbol_value<size> symval; | |
2527 | if (gsym != NULL) | |
2528 | { | |
2529 | const AArch64_reloc_property* arp = aarch64_reloc_property_table-> | |
2530 | get_reloc_property(r_type); | |
2531 | if (gsym->use_plt_offset(arp->reference_flags())) | |
2532 | { | |
2533 | // This uses a PLT, change the symbol value. | |
2534 | symval.set_output_value(this->plt_section()->address() | |
2535 | + gsym->plt_offset()); | |
2536 | psymval = &symval; | |
2537 | } | |
2538 | else if (gsym->is_undefined()) | |
2539 | // There is no need to generate a stub symbol is undefined. | |
2540 | return; | |
2541 | } | |
2542 | ||
2543 | // Get the symbol value. | |
2544 | typename Symbol_value<size>::Value value = psymval->value(aarch64_relobj, 0); | |
2545 | ||
2546 | // Owing to pipelining, the PC relative branches below actually skip | |
2547 | // two instructions when the branch offset is 0. | |
2548 | Address destination = static_cast<Address>(-1); | |
2549 | switch (r_type) | |
2550 | { | |
2551 | case elfcpp::R_AARCH64_CALL26: | |
2552 | case elfcpp::R_AARCH64_JUMP26: | |
2553 | destination = value + addend; | |
2554 | break; | |
2555 | default: | |
9726c3c1 | 2556 | gold_unreachable(); |
83a01957 HS |
2557 | } |
2558 | ||
2559 | typename The_reloc_stub::Stub_type stub_type = The_reloc_stub:: | |
2560 | stub_type_for_reloc(r_type, address, destination); | |
2561 | if (stub_type == The_reloc_stub::ST_NONE) | |
2562 | return ; | |
2563 | ||
2564 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); | |
2565 | gold_assert(stub_table != NULL); | |
2566 | ||
2567 | The_reloc_stub_key key(stub_type, gsym, aarch64_relobj, r_sym, addend); | |
2568 | The_reloc_stub* stub = stub_table->find_reloc_stub(key); | |
2569 | if (stub == NULL) | |
2570 | { | |
2571 | stub = new The_reloc_stub(stub_type); | |
2572 | stub_table->add_reloc_stub(stub, key); | |
2573 | } | |
2574 | stub->set_destination_address(destination); | |
2575 | } // End of Target_aarch64::scan_reloc_for_stub | |
2576 | ||
2577 | ||
2578 | // This function scans a relocation section for stub generation. | |
2579 | // The template parameter Relocate must be a class type which provides | |
2580 | // a single function, relocate(), which implements the machine | |
2581 | // specific part of a relocation. | |
2582 | ||
2583 | // BIG_ENDIAN is the endianness of the data. SH_TYPE is the section type: | |
2584 | // SHT_REL or SHT_RELA. | |
2585 | ||
2586 | // PRELOCS points to the relocation data. RELOC_COUNT is the number | |
2587 | // of relocs. OUTPUT_SECTION is the output section. | |
2588 | // NEEDS_SPECIAL_OFFSET_HANDLING is true if input offsets need to be | |
2589 | // mapped to output offsets. | |
2590 | ||
2591 | // VIEW is the section data, VIEW_ADDRESS is its memory address, and | |
2592 | // VIEW_SIZE is the size. These refer to the input section, unless | |
2593 | // NEEDS_SPECIAL_OFFSET_HANDLING is true, in which case they refer to | |
2594 | // the output section. | |
2595 | ||
2596 | template<int size, bool big_endian> | |
2597 | template<int sh_type> | |
2598 | void inline | |
2599 | Target_aarch64<size, big_endian>::scan_reloc_section_for_stubs( | |
2600 | const Relocate_info<size, big_endian>* relinfo, | |
2601 | const unsigned char* prelocs, | |
2602 | size_t reloc_count, | |
2603 | Output_section* /*output_section*/, | |
2604 | bool /*needs_special_offset_handling*/, | |
2605 | const unsigned char* /*view*/, | |
2606 | Address view_address, | |
2607 | section_size_type) | |
2608 | { | |
2609 | typedef typename Reloc_types<sh_type,size,big_endian>::Reloc Reltype; | |
2610 | ||
2611 | const int reloc_size = | |
2612 | Reloc_types<sh_type,size,big_endian>::reloc_size; | |
2613 | AArch64_relobj<size, big_endian>* object = | |
2614 | static_cast<AArch64_relobj<size, big_endian>*>(relinfo->object); | |
2615 | unsigned int local_count = object->local_symbol_count(); | |
2616 | ||
2617 | gold::Default_comdat_behavior default_comdat_behavior; | |
2618 | Comdat_behavior comdat_behavior = CB_UNDETERMINED; | |
2619 | ||
2620 | for (size_t i = 0; i < reloc_count; ++i, prelocs += reloc_size) | |
2621 | { | |
2622 | Reltype reloc(prelocs); | |
2623 | typename elfcpp::Elf_types<size>::Elf_WXword r_info = reloc.get_r_info(); | |
2624 | unsigned int r_sym = elfcpp::elf_r_sym<size>(r_info); | |
2625 | unsigned int r_type = elfcpp::elf_r_type<size>(r_info); | |
2626 | if (r_type != elfcpp::R_AARCH64_CALL26 | |
2627 | && r_type != elfcpp::R_AARCH64_JUMP26) | |
2628 | continue; | |
2629 | ||
2630 | section_offset_type offset = | |
2631 | convert_to_section_size_type(reloc.get_r_offset()); | |
2632 | ||
2633 | // Get the addend. | |
2634 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = | |
2635 | reloc.get_r_addend(); | |
2636 | ||
2637 | const Sized_symbol<size>* sym; | |
2638 | Symbol_value<size> symval; | |
2639 | const Symbol_value<size> *psymval; | |
2640 | bool is_defined_in_discarded_section; | |
2641 | unsigned int shndx; | |
2642 | if (r_sym < local_count) | |
2643 | { | |
2644 | sym = NULL; | |
2645 | psymval = object->local_symbol(r_sym); | |
2646 | ||
2647 | // If the local symbol belongs to a section we are discarding, | |
2648 | // and that section is a debug section, try to find the | |
2649 | // corresponding kept section and map this symbol to its | |
2650 | // counterpart in the kept section. The symbol must not | |
2651 | // correspond to a section we are folding. | |
2652 | bool is_ordinary; | |
2653 | shndx = psymval->input_shndx(&is_ordinary); | |
2654 | is_defined_in_discarded_section = | |
2655 | (is_ordinary | |
2656 | && shndx != elfcpp::SHN_UNDEF | |
2657 | && !object->is_section_included(shndx) | |
2658 | && !relinfo->symtab->is_section_folded(object, shndx)); | |
2659 | ||
2660 | // We need to compute the would-be final value of this local | |
2661 | // symbol. | |
2662 | if (!is_defined_in_discarded_section) | |
2663 | { | |
2664 | typedef Sized_relobj_file<size, big_endian> ObjType; | |
2665 | typename ObjType::Compute_final_local_value_status status = | |
2666 | object->compute_final_local_value(r_sym, psymval, &symval, | |
2667 | relinfo->symtab); | |
2668 | if (status == ObjType::CFLV_OK) | |
2669 | { | |
2670 | // Currently we cannot handle a branch to a target in | |
2671 | // a merged section. If this is the case, issue an error | |
2672 | // and also free the merge symbol value. | |
2673 | if (!symval.has_output_value()) | |
2674 | { | |
2675 | const std::string& section_name = | |
2676 | object->section_name(shndx); | |
2677 | object->error(_("cannot handle branch to local %u " | |
2678 | "in a merged section %s"), | |
2679 | r_sym, section_name.c_str()); | |
2680 | } | |
2681 | psymval = &symval; | |
2682 | } | |
2683 | else | |
2684 | { | |
2685 | // We cannot determine the final value. | |
2686 | continue; | |
2687 | } | |
2688 | } | |
2689 | } | |
2690 | else | |
2691 | { | |
2692 | const Symbol* gsym; | |
2693 | gsym = object->global_symbol(r_sym); | |
2694 | gold_assert(gsym != NULL); | |
2695 | if (gsym->is_forwarder()) | |
2696 | gsym = relinfo->symtab->resolve_forwards(gsym); | |
2697 | ||
2698 | sym = static_cast<const Sized_symbol<size>*>(gsym); | |
2699 | if (sym->has_symtab_index() && sym->symtab_index() != -1U) | |
2700 | symval.set_output_symtab_index(sym->symtab_index()); | |
2701 | else | |
2702 | symval.set_no_output_symtab_entry(); | |
2703 | ||
2704 | // We need to compute the would-be final value of this global | |
2705 | // symbol. | |
2706 | const Symbol_table* symtab = relinfo->symtab; | |
2707 | const Sized_symbol<size>* sized_symbol = | |
2708 | symtab->get_sized_symbol<size>(gsym); | |
2709 | Symbol_table::Compute_final_value_status status; | |
2710 | typename elfcpp::Elf_types<size>::Elf_Addr value = | |
2711 | symtab->compute_final_value<size>(sized_symbol, &status); | |
2712 | ||
2713 | // Skip this if the symbol has not output section. | |
2714 | if (status == Symbol_table::CFVS_NO_OUTPUT_SECTION) | |
2715 | continue; | |
2716 | symval.set_output_value(value); | |
2717 | ||
2718 | if (gsym->type() == elfcpp::STT_TLS) | |
2719 | symval.set_is_tls_symbol(); | |
2720 | else if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2721 | symval.set_is_ifunc_symbol(); | |
2722 | psymval = &symval; | |
2723 | ||
2724 | is_defined_in_discarded_section = | |
2725 | (gsym->is_defined_in_discarded_section() | |
2726 | && gsym->is_undefined()); | |
2727 | shndx = 0; | |
2728 | } | |
2729 | ||
2730 | Symbol_value<size> symval2; | |
2731 | if (is_defined_in_discarded_section) | |
2732 | { | |
2733 | if (comdat_behavior == CB_UNDETERMINED) | |
2734 | { | |
2735 | std::string name = object->section_name(relinfo->data_shndx); | |
2736 | comdat_behavior = default_comdat_behavior.get(name.c_str()); | |
2737 | } | |
2738 | if (comdat_behavior == CB_PRETEND) | |
2739 | { | |
2740 | bool found; | |
2741 | typename elfcpp::Elf_types<size>::Elf_Addr value = | |
2742 | object->map_to_kept_section(shndx, &found); | |
2743 | if (found) | |
2744 | symval2.set_output_value(value + psymval->input_value()); | |
2745 | else | |
2746 | symval2.set_output_value(0); | |
2747 | } | |
2748 | else | |
2749 | { | |
2750 | if (comdat_behavior == CB_WARNING) | |
2751 | gold_warning_at_location(relinfo, i, offset, | |
2752 | _("relocation refers to discarded " | |
2753 | "section")); | |
2754 | symval2.set_output_value(0); | |
2755 | } | |
2756 | symval2.set_no_output_symtab_entry(); | |
2757 | psymval = &symval2; | |
2758 | } | |
2759 | ||
2760 | // If symbol is a section symbol, we don't know the actual type of | |
2761 | // destination. Give up. | |
2762 | if (psymval->is_section_symbol()) | |
2763 | continue; | |
2764 | ||
2765 | this->scan_reloc_for_stub(relinfo, r_type, sym, r_sym, psymval, | |
2766 | addend, view_address + offset); | |
2767 | } // End of iterating relocs in a section | |
2768 | } // End of Target_aarch64::scan_reloc_section_for_stubs | |
2769 | ||
2770 | ||
2771 | // Scan an input section for stub generation. | |
2772 | ||
2773 | template<int size, bool big_endian> | |
2774 | void | |
2775 | Target_aarch64<size, big_endian>::scan_section_for_stubs( | |
2776 | const Relocate_info<size, big_endian>* relinfo, | |
2777 | unsigned int sh_type, | |
2778 | const unsigned char* prelocs, | |
2779 | size_t reloc_count, | |
2780 | Output_section* output_section, | |
2781 | bool needs_special_offset_handling, | |
2782 | const unsigned char* view, | |
2783 | Address view_address, | |
2784 | section_size_type view_size) | |
2785 | { | |
2786 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2787 | this->scan_reloc_section_for_stubs<elfcpp::SHT_RELA>( | |
2788 | relinfo, | |
2789 | prelocs, | |
2790 | reloc_count, | |
2791 | output_section, | |
2792 | needs_special_offset_handling, | |
2793 | view, | |
2794 | view_address, | |
2795 | view_size); | |
2796 | } | |
2797 | ||
2798 | ||
2799 | // Relocate a single stub. | |
2800 | ||
2801 | template<int size, bool big_endian> | |
2802 | void Target_aarch64<size, big_endian>:: | |
2803 | relocate_stub(The_reloc_stub* stub, | |
2804 | const The_relocate_info*, | |
2805 | Output_section*, | |
2806 | unsigned char* view, | |
2807 | Address address, | |
2808 | section_size_type) | |
2809 | { | |
2810 | typedef AArch64_relocate_functions<size, big_endian> The_reloc_functions; | |
2811 | typedef typename The_reloc_functions::Status The_reloc_functions_status; | |
2812 | typedef typename elfcpp::Swap<32,big_endian>::Valtype Insntype; | |
2813 | ||
2814 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
2815 | int insn_number = stub->stub_insn_number(); | |
2816 | const uint32_t* insns = stub->stub_insns(); | |
2817 | // Check the insns are really those stub insns. | |
2818 | for (int i = 0; i < insn_number; ++i) | |
2819 | { | |
2820 | Insntype insn = elfcpp::Swap<32,big_endian>::readval(ip + i); | |
2821 | gold_assert(((uint32_t)insn == insns[i+1])); | |
2822 | } | |
2823 | ||
2824 | Address dest = stub->destination_address(); | |
2825 | ||
2826 | switch(stub->stub_type()) | |
2827 | { | |
2828 | case The_reloc_stub::ST_ADRP_BRANCH: | |
2829 | { | |
2830 | // 1st reloc is ADR_PREL_PG_HI21 | |
2831 | The_reloc_functions_status status = | |
2832 | The_reloc_functions::adrp(view, dest, address); | |
2833 | // An error should never arise in the above step. If so, please | |
2834 | // check 'aarch64_valid_for_adrp_p'. | |
2835 | gold_assert(status == The_reloc_functions::STATUS_OKAY); | |
2836 | ||
2837 | // 2nd reloc is ADD_ABS_LO12_NC | |
2838 | const AArch64_reloc_property* arp = | |
2839 | aarch64_reloc_property_table->get_reloc_property( | |
2840 | elfcpp::R_AARCH64_ADD_ABS_LO12_NC); | |
2841 | gold_assert(arp != NULL); | |
2842 | status = The_reloc_functions::template | |
2843 | rela_general<32>(view + 4, dest, 0, arp); | |
2844 | // An error should never arise, it is an "_NC" relocation. | |
2845 | gold_assert(status == The_reloc_functions::STATUS_OKAY); | |
2846 | } | |
2847 | break; | |
2848 | ||
2849 | case The_reloc_stub::ST_LONG_BRANCH_ABS: | |
2850 | // 1st reloc is R_AARCH64_PREL64, at offset 8 | |
2851 | elfcpp::Swap<64,big_endian>::writeval(view + 8, dest); | |
2852 | break; | |
2853 | ||
2854 | case The_reloc_stub::ST_LONG_BRANCH_PCREL: | |
2855 | { | |
2856 | // "PC" calculation is the 2nd insn in the stub. | |
2857 | uint64_t offset = dest - (address + 4); | |
2858 | // Offset is placed at offset 4 and 5. | |
2859 | elfcpp::Swap<64,big_endian>::writeval(view + 16, offset); | |
2860 | } | |
2861 | break; | |
2862 | ||
2863 | default: | |
9726c3c1 | 2864 | gold_unreachable(); |
83a01957 HS |
2865 | } |
2866 | } | |
2867 | ||
2868 | ||
053a4d68 JY |
2869 | // A class to handle the PLT data. |
2870 | // This is an abstract base class that handles most of the linker details | |
2871 | // but does not know the actual contents of PLT entries. The derived | |
2872 | // classes below fill in those details. | |
2873 | ||
2874 | template<int size, bool big_endian> | |
2875 | class Output_data_plt_aarch64 : public Output_section_data | |
2876 | { | |
2877 | public: | |
2878 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> | |
2879 | Reloc_section; | |
2880 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
2881 | ||
2882 | Output_data_plt_aarch64(Layout* layout, | |
9363c7c3 | 2883 | uint64_t addralign, |
3a531937 JY |
2884 | Output_data_got_aarch64<size, big_endian>* got, |
2885 | Output_data_space* got_plt, | |
2886 | Output_data_space* got_irelative) | |
9726c3c1 | 2887 | : Output_section_data(addralign), tlsdesc_rel_(NULL), irelative_rel_(NULL), |
3a531937 JY |
2888 | got_(got), got_plt_(got_plt), got_irelative_(got_irelative), |
2889 | count_(0), irelative_count_(0), tlsdesc_got_offset_(-1U) | |
053a4d68 JY |
2890 | { this->init(layout); } |
2891 | ||
2892 | // Initialize the PLT section. | |
2893 | void | |
2894 | init(Layout* layout); | |
2895 | ||
2896 | // Add an entry to the PLT. | |
2897 | void | |
9726c3c1 HS |
2898 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
2899 | ||
2900 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
2901 | unsigned int | |
2902 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, | |
2903 | Sized_relobj_file<size, big_endian>* relobj, | |
2904 | unsigned int local_sym_index); | |
2905 | ||
2906 | // Add the relocation for a PLT entry. | |
2907 | void | |
2908 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, | |
2909 | unsigned int got_offset); | |
053a4d68 | 2910 | |
3a531937 JY |
2911 | // Add the reserved TLSDESC_PLT entry to the PLT. |
2912 | void | |
2913 | reserve_tlsdesc_entry(unsigned int got_offset) | |
2914 | { this->tlsdesc_got_offset_ = got_offset; } | |
2915 | ||
2916 | // Return true if a TLSDESC_PLT entry has been reserved. | |
2917 | bool | |
2918 | has_tlsdesc_entry() const | |
2919 | { return this->tlsdesc_got_offset_ != -1U; } | |
2920 | ||
2921 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
2922 | unsigned int | |
2923 | get_tlsdesc_got_offset() const | |
2924 | { return this->tlsdesc_got_offset_; } | |
2925 | ||
2926 | // Return the PLT offset of the reserved TLSDESC_PLT entry. | |
2927 | unsigned int | |
2928 | get_tlsdesc_plt_offset() const | |
2929 | { | |
2930 | return (this->first_plt_entry_offset() + | |
2931 | (this->count_ + this->irelative_count_) | |
2932 | * this->get_plt_entry_size()); | |
2933 | } | |
2934 | ||
053a4d68 JY |
2935 | // Return the .rela.plt section data. |
2936 | Reloc_section* | |
2937 | rela_plt() | |
2938 | { return this->rel_; } | |
2939 | ||
3a531937 JY |
2940 | // Return where the TLSDESC relocations should go. |
2941 | Reloc_section* | |
2942 | rela_tlsdesc(Layout*); | |
2943 | ||
2944 | // Return where the IRELATIVE relocations should go in the PLT | |
2945 | // relocations. | |
2946 | Reloc_section* | |
2947 | rela_irelative(Symbol_table*, Layout*); | |
2948 | ||
9363c7c3 JY |
2949 | // Return whether we created a section for IRELATIVE relocations. |
2950 | bool | |
2951 | has_irelative_section() const | |
2952 | { return this->irelative_rel_ != NULL; } | |
2953 | ||
053a4d68 JY |
2954 | // Return the number of PLT entries. |
2955 | unsigned int | |
2956 | entry_count() const | |
3a531937 | 2957 | { return this->count_ + this->irelative_count_; } |
053a4d68 JY |
2958 | |
2959 | // Return the offset of the first non-reserved PLT entry. | |
2960 | unsigned int | |
3a531937 | 2961 | first_plt_entry_offset() const |
053a4d68 JY |
2962 | { return this->do_first_plt_entry_offset(); } |
2963 | ||
2964 | // Return the size of a PLT entry. | |
2965 | unsigned int | |
2966 | get_plt_entry_size() const | |
2967 | { return this->do_get_plt_entry_size(); } | |
2968 | ||
3a531937 JY |
2969 | // Return the reserved tlsdesc entry size. |
2970 | unsigned int | |
2971 | get_plt_tlsdesc_entry_size() const | |
2972 | { return this->do_get_plt_tlsdesc_entry_size(); } | |
2973 | ||
9363c7c3 JY |
2974 | // Return the PLT address to use for a global symbol. |
2975 | uint64_t | |
2976 | address_for_global(const Symbol*); | |
2977 | ||
2978 | // Return the PLT address to use for a local symbol. | |
2979 | uint64_t | |
2980 | address_for_local(const Relobj*, unsigned int symndx); | |
2981 | ||
053a4d68 JY |
2982 | protected: |
2983 | // Fill in the first PLT entry. | |
2984 | void | |
2985 | fill_first_plt_entry(unsigned char* pov, | |
2986 | Address got_address, | |
2987 | Address plt_address) | |
2988 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } | |
2989 | ||
2990 | // Fill in a normal PLT entry. | |
2991 | void | |
2992 | fill_plt_entry(unsigned char* pov, | |
2993 | Address got_address, | |
2994 | Address plt_address, | |
2995 | unsigned int got_offset, | |
2996 | unsigned int plt_offset) | |
2997 | { | |
2998 | this->do_fill_plt_entry(pov, got_address, plt_address, | |
2999 | got_offset, plt_offset); | |
3000 | } | |
3001 | ||
3a531937 JY |
3002 | // Fill in the reserved TLSDESC PLT entry. |
3003 | void | |
3004 | fill_tlsdesc_entry(unsigned char* pov, | |
3005 | Address gotplt_address, | |
3006 | Address plt_address, | |
3007 | Address got_base, | |
3008 | unsigned int tlsdesc_got_offset, | |
3009 | unsigned int plt_offset) | |
3010 | { | |
3011 | this->do_fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, | |
3012 | tlsdesc_got_offset, plt_offset); | |
3013 | } | |
3014 | ||
053a4d68 JY |
3015 | virtual unsigned int |
3016 | do_first_plt_entry_offset() const = 0; | |
3017 | ||
3018 | virtual unsigned int | |
3019 | do_get_plt_entry_size() const = 0; | |
3020 | ||
3a531937 JY |
3021 | virtual unsigned int |
3022 | do_get_plt_tlsdesc_entry_size() const = 0; | |
3023 | ||
053a4d68 JY |
3024 | virtual void |
3025 | do_fill_first_plt_entry(unsigned char* pov, | |
3026 | Address got_addr, | |
3027 | Address plt_addr) = 0; | |
3028 | ||
3029 | virtual void | |
3030 | do_fill_plt_entry(unsigned char* pov, | |
3031 | Address got_address, | |
3032 | Address plt_address, | |
3033 | unsigned int got_offset, | |
3034 | unsigned int plt_offset) = 0; | |
3035 | ||
3a531937 JY |
3036 | virtual void |
3037 | do_fill_tlsdesc_entry(unsigned char* pov, | |
3038 | Address gotplt_address, | |
3039 | Address plt_address, | |
3040 | Address got_base, | |
3041 | unsigned int tlsdesc_got_offset, | |
3042 | unsigned int plt_offset) = 0; | |
3043 | ||
053a4d68 JY |
3044 | void |
3045 | do_adjust_output_section(Output_section* os); | |
3046 | ||
3047 | // Write to a map file. | |
3048 | void | |
3049 | do_print_to_mapfile(Mapfile* mapfile) const | |
3050 | { mapfile->print_output_data(this, _("** PLT")); } | |
3051 | ||
3052 | private: | |
3053 | // Set the final size. | |
3054 | void | |
3055 | set_final_data_size(); | |
3056 | ||
3057 | // Write out the PLT data. | |
3058 | void | |
3059 | do_write(Output_file*); | |
3060 | ||
3061 | // The reloc section. | |
3062 | Reloc_section* rel_; | |
3a531937 JY |
3063 | |
3064 | // The TLSDESC relocs, if necessary. These must follow the regular | |
3065 | // PLT relocs. | |
3066 | Reloc_section* tlsdesc_rel_; | |
3067 | ||
9363c7c3 JY |
3068 | // The IRELATIVE relocs, if necessary. These must follow the |
3069 | // regular PLT relocations. | |
3070 | Reloc_section* irelative_rel_; | |
3a531937 | 3071 | |
053a4d68 JY |
3072 | // The .got section. |
3073 | Output_data_got_aarch64<size, big_endian>* got_; | |
3a531937 | 3074 | |
053a4d68 JY |
3075 | // The .got.plt section. |
3076 | Output_data_space* got_plt_; | |
3a531937 JY |
3077 | |
3078 | // The part of the .got.plt section used for IRELATIVE relocs. | |
3079 | Output_data_space* got_irelative_; | |
3080 | ||
053a4d68 JY |
3081 | // The number of PLT entries. |
3082 | unsigned int count_; | |
3a531937 | 3083 | |
fa89cc82 | 3084 | // Number of PLT entries with R_AARCH64_IRELATIVE relocs. These |
3a531937 JY |
3085 | // follow the regular PLT entries. |
3086 | unsigned int irelative_count_; | |
3087 | ||
3088 | // GOT offset of the reserved TLSDESC_GOT entry for the lazy trampoline. | |
3089 | // Communicated to the loader via DT_TLSDESC_GOT. The magic value -1 | |
3090 | // indicates an offset is not allocated. | |
3091 | unsigned int tlsdesc_got_offset_; | |
053a4d68 JY |
3092 | }; |
3093 | ||
3094 | // Initialize the PLT section. | |
3095 | ||
3096 | template<int size, bool big_endian> | |
3097 | void | |
3098 | Output_data_plt_aarch64<size, big_endian>::init(Layout* layout) | |
3099 | { | |
3100 | this->rel_ = new Reloc_section(false); | |
3101 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
3102 | elfcpp::SHF_ALLOC, this->rel_, | |
3103 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
3104 | } | |
3105 | ||
3106 | template<int size, bool big_endian> | |
3107 | void | |
3108 | Output_data_plt_aarch64<size, big_endian>::do_adjust_output_section( | |
3109 | Output_section* os) | |
3110 | { | |
3111 | os->set_entsize(this->get_plt_entry_size()); | |
3112 | } | |
3113 | ||
3114 | // Add an entry to the PLT. | |
3115 | ||
3116 | template<int size, bool big_endian> | |
3117 | void | |
9726c3c1 HS |
3118 | Output_data_plt_aarch64<size, big_endian>::add_entry(Symbol_table* symtab, |
3119 | Layout* layout, Symbol* gsym) | |
053a4d68 JY |
3120 | { |
3121 | gold_assert(!gsym->has_plt_offset()); | |
9363c7c3 | 3122 | |
9726c3c1 HS |
3123 | unsigned int* pcount; |
3124 | unsigned int plt_reserved; | |
3125 | Output_section_data_build* got; | |
9363c7c3 | 3126 | |
9726c3c1 HS |
3127 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
3128 | && gsym->can_use_relative_reloc(false)) | |
3129 | { | |
3130 | pcount = &this->irelative_count_; | |
3131 | plt_reserved = 0; | |
3132 | got = this->got_irelative_; | |
3133 | } | |
3134 | else | |
3135 | { | |
3136 | pcount = &this->count_; | |
3137 | plt_reserved = this->first_plt_entry_offset(); | |
3138 | got = this->got_plt_; | |
3139 | } | |
9363c7c3 | 3140 | |
9726c3c1 HS |
3141 | gsym->set_plt_offset((*pcount) * this->get_plt_entry_size() |
3142 | + plt_reserved); | |
3143 | ||
3144 | ++*pcount; | |
3145 | ||
3146 | section_offset_type got_offset = got->current_data_size(); | |
9363c7c3 JY |
3147 | |
3148 | // Every PLT entry needs a GOT entry which points back to the PLT | |
3149 | // entry (this will be changed by the dynamic linker, normally | |
3150 | // lazily when the function is called). | |
9726c3c1 | 3151 | got->set_current_data_size(got_offset + size / 8); |
9363c7c3 JY |
3152 | |
3153 | // Every PLT entry needs a reloc. | |
9726c3c1 | 3154 | this->add_relocation(symtab, layout, gsym, got_offset); |
9363c7c3 JY |
3155 | |
3156 | // Note that we don't need to save the symbol. The contents of the | |
3157 | // PLT are independent of which symbols are used. The symbols only | |
3158 | // appear in the relocations. | |
3159 | } | |
3160 | ||
9726c3c1 HS |
3161 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
3162 | // the PLT offset. | |
3163 | ||
3164 | template<int size, bool big_endian> | |
3165 | unsigned int | |
3166 | Output_data_plt_aarch64<size, big_endian>::add_local_ifunc_entry( | |
3167 | Symbol_table* symtab, | |
3168 | Layout* layout, | |
3169 | Sized_relobj_file<size, big_endian>* relobj, | |
3170 | unsigned int local_sym_index) | |
3171 | { | |
3172 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); | |
3173 | ++this->irelative_count_; | |
3174 | ||
3175 | section_offset_type got_offset = this->got_irelative_->current_data_size(); | |
3176 | ||
3177 | // Every PLT entry needs a GOT entry which points back to the PLT | |
3178 | // entry. | |
3179 | this->got_irelative_->set_current_data_size(got_offset + size / 8); | |
3180 | ||
3181 | // Every PLT entry needs a reloc. | |
3182 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
3183 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
3184 | elfcpp::R_AARCH64_IRELATIVE, | |
3185 | this->got_irelative_, got_offset, 0); | |
3186 | ||
3187 | return plt_offset; | |
3188 | } | |
3189 | ||
3190 | // Add the relocation for a PLT entry. | |
3191 | ||
3192 | template<int size, bool big_endian> | |
3193 | void | |
3194 | Output_data_plt_aarch64<size, big_endian>::add_relocation( | |
3195 | Symbol_table* symtab, Layout* layout, Symbol* gsym, unsigned int got_offset) | |
3196 | { | |
3197 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
3198 | && gsym->can_use_relative_reloc(false)) | |
3199 | { | |
3200 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
3201 | rela->add_symbolless_global_addend(gsym, elfcpp::R_AARCH64_IRELATIVE, | |
3202 | this->got_irelative_, got_offset, 0); | |
3203 | } | |
3204 | else | |
3205 | { | |
3206 | gsym->set_needs_dynsym_entry(); | |
3207 | this->rel_->add_global(gsym, elfcpp::R_AARCH64_JUMP_SLOT, this->got_plt_, | |
3208 | got_offset, 0); | |
3209 | } | |
3210 | } | |
3211 | ||
3a531937 JY |
3212 | // Return where the TLSDESC relocations should go, creating it if |
3213 | // necessary. These follow the JUMP_SLOT relocations. | |
3214 | ||
3215 | template<int size, bool big_endian> | |
3216 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* | |
3217 | Output_data_plt_aarch64<size, big_endian>::rela_tlsdesc(Layout* layout) | |
3218 | { | |
3219 | if (this->tlsdesc_rel_ == NULL) | |
3220 | { | |
3221 | this->tlsdesc_rel_ = new Reloc_section(false); | |
3222 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
3223 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
3224 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
3225 | gold_assert(this->tlsdesc_rel_->output_section() | |
3226 | == this->rel_->output_section()); | |
3227 | } | |
3228 | return this->tlsdesc_rel_; | |
3229 | } | |
3230 | ||
3231 | // Return where the IRELATIVE relocations should go in the PLT. These | |
3232 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
3233 | ||
3234 | template<int size, bool big_endian> | |
3235 | typename Output_data_plt_aarch64<size, big_endian>::Reloc_section* | |
3236 | Output_data_plt_aarch64<size, big_endian>::rela_irelative(Symbol_table* symtab, | |
3237 | Layout* layout) | |
3238 | { | |
3239 | if (this->irelative_rel_ == NULL) | |
3240 | { | |
3241 | // Make sure we have a place for the TLSDESC relocations, in | |
3242 | // case we see any later on. | |
3243 | this->rela_tlsdesc(layout); | |
3244 | this->irelative_rel_ = new Reloc_section(false); | |
3245 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
3246 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
3247 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
3248 | gold_assert(this->irelative_rel_->output_section() | |
3249 | == this->rel_->output_section()); | |
3250 | ||
3251 | if (parameters->doing_static_link()) | |
3252 | { | |
3253 | // A statically linked executable will only have a .rela.plt | |
3254 | // section to hold R_AARCH64_IRELATIVE relocs for | |
3255 | // STT_GNU_IFUNC symbols. The library will use these | |
3256 | // symbols to locate the IRELATIVE relocs at program startup | |
3257 | // time. | |
3258 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
3259 | Symbol_table::PREDEFINED, | |
3260 | this->irelative_rel_, 0, 0, | |
3261 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
3262 | elfcpp::STV_HIDDEN, 0, false, true); | |
3263 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
3264 | Symbol_table::PREDEFINED, | |
3265 | this->irelative_rel_, 0, 0, | |
3266 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
3267 | elfcpp::STV_HIDDEN, 0, true, true); | |
3268 | } | |
3269 | } | |
3270 | return this->irelative_rel_; | |
3271 | } | |
3272 | ||
9363c7c3 JY |
3273 | // Return the PLT address to use for a global symbol. |
3274 | ||
3275 | template<int size, bool big_endian> | |
3276 | uint64_t | |
3277 | Output_data_plt_aarch64<size, big_endian>::address_for_global( | |
3278 | const Symbol* gsym) | |
3279 | { | |
3280 | uint64_t offset = 0; | |
3281 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
3282 | && gsym->can_use_relative_reloc(false)) | |
3283 | offset = (this->first_plt_entry_offset() + | |
3284 | this->count_ * this->get_plt_entry_size()); | |
3285 | return this->address() + offset + gsym->plt_offset(); | |
3286 | } | |
3287 | ||
3288 | // Return the PLT address to use for a local symbol. These are always | |
3289 | // IRELATIVE relocs. | |
3290 | ||
3291 | template<int size, bool big_endian> | |
3292 | uint64_t | |
3293 | Output_data_plt_aarch64<size, big_endian>::address_for_local( | |
3294 | const Relobj* object, | |
3295 | unsigned int r_sym) | |
3296 | { | |
3297 | return (this->address() | |
3298 | + this->first_plt_entry_offset() | |
3299 | + this->count_ * this->get_plt_entry_size() | |
3300 | + object->local_plt_offset(r_sym)); | |
053a4d68 JY |
3301 | } |
3302 | ||
3303 | // Set the final size. | |
9363c7c3 | 3304 | |
053a4d68 JY |
3305 | template<int size, bool big_endian> |
3306 | void | |
3307 | Output_data_plt_aarch64<size, big_endian>::set_final_data_size() | |
3308 | { | |
3a531937 JY |
3309 | unsigned int count = this->count_ + this->irelative_count_; |
3310 | unsigned int extra_size = 0; | |
3311 | if (this->has_tlsdesc_entry()) | |
3312 | extra_size += this->get_plt_tlsdesc_entry_size(); | |
053a4d68 | 3313 | this->set_data_size(this->first_plt_entry_offset() |
3a531937 JY |
3314 | + count * this->get_plt_entry_size() |
3315 | + extra_size); | |
053a4d68 JY |
3316 | } |
3317 | ||
3318 | template<int size, bool big_endian> | |
3319 | class Output_data_plt_aarch64_standard : | |
3320 | public Output_data_plt_aarch64<size, big_endian> | |
3321 | { | |
3322 | public: | |
3323 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
3a531937 JY |
3324 | Output_data_plt_aarch64_standard( |
3325 | Layout* layout, | |
3326 | Output_data_got_aarch64<size, big_endian>* got, | |
3327 | Output_data_space* got_plt, | |
3328 | Output_data_space* got_irelative) | |
053a4d68 | 3329 | : Output_data_plt_aarch64<size, big_endian>(layout, |
9363c7c3 | 3330 | size == 32 ? 4 : 8, |
3a531937 JY |
3331 | got, got_plt, |
3332 | got_irelative) | |
053a4d68 JY |
3333 | { } |
3334 | ||
3335 | protected: | |
3336 | // Return the offset of the first non-reserved PLT entry. | |
3337 | virtual unsigned int | |
3338 | do_first_plt_entry_offset() const | |
3339 | { return this->first_plt_entry_size; } | |
3340 | ||
3341 | // Return the size of a PLT entry | |
3342 | virtual unsigned int | |
3343 | do_get_plt_entry_size() const | |
3344 | { return this->plt_entry_size; } | |
3345 | ||
3a531937 JY |
3346 | // Return the size of a tlsdesc entry |
3347 | virtual unsigned int | |
3348 | do_get_plt_tlsdesc_entry_size() const | |
3349 | { return this->plt_tlsdesc_entry_size; } | |
3350 | ||
053a4d68 JY |
3351 | virtual void |
3352 | do_fill_first_plt_entry(unsigned char* pov, | |
9363c7c3 JY |
3353 | Address got_address, |
3354 | Address plt_address); | |
053a4d68 JY |
3355 | |
3356 | virtual void | |
3357 | do_fill_plt_entry(unsigned char* pov, | |
9363c7c3 JY |
3358 | Address got_address, |
3359 | Address plt_address, | |
3360 | unsigned int got_offset, | |
3361 | unsigned int plt_offset); | |
053a4d68 | 3362 | |
3a531937 JY |
3363 | virtual void |
3364 | do_fill_tlsdesc_entry(unsigned char* pov, | |
3365 | Address gotplt_address, | |
3366 | Address plt_address, | |
3367 | Address got_base, | |
3368 | unsigned int tlsdesc_got_offset, | |
3369 | unsigned int plt_offset); | |
3370 | ||
053a4d68 JY |
3371 | private: |
3372 | // The size of the first plt entry size. | |
3373 | static const int first_plt_entry_size = 32; | |
3374 | // The size of the plt entry size. | |
3375 | static const int plt_entry_size = 16; | |
3a531937 JY |
3376 | // The size of the plt tlsdesc entry size. |
3377 | static const int plt_tlsdesc_entry_size = 32; | |
053a4d68 JY |
3378 | // Template for the first PLT entry. |
3379 | static const uint32_t first_plt_entry[first_plt_entry_size / 4]; | |
3380 | // Template for subsequent PLT entries. | |
3381 | static const uint32_t plt_entry[plt_entry_size / 4]; | |
3a531937 JY |
3382 | // The reserved TLSDESC entry in the PLT for an executable. |
3383 | static const uint32_t tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4]; | |
053a4d68 JY |
3384 | }; |
3385 | ||
3386 | // The first entry in the PLT for an executable. | |
3387 | ||
3388 | template<> | |
3389 | const uint32_t | |
3390 | Output_data_plt_aarch64_standard<32, false>:: | |
3391 | first_plt_entry[first_plt_entry_size / 4] = | |
3392 | { | |
3393 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
3394 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ | |
3395 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ | |
3396 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ | |
3397 | 0xd61f0220, /* br x17 */ | |
3398 | 0xd503201f, /* nop */ | |
3399 | 0xd503201f, /* nop */ | |
3400 | 0xd503201f, /* nop */ | |
3401 | }; | |
3402 | ||
83a01957 | 3403 | |
053a4d68 JY |
3404 | template<> |
3405 | const uint32_t | |
3406 | Output_data_plt_aarch64_standard<32, true>:: | |
3407 | first_plt_entry[first_plt_entry_size / 4] = | |
3408 | { | |
3409 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
3410 | 0x90000010, /* adrp x16, PLT_GOT+0x8 */ | |
3411 | 0xb9400A11, /* ldr w17, [x16, #PLT_GOT+0x8] */ | |
3412 | 0x11002210, /* add w16, w16,#PLT_GOT+0x8 */ | |
3413 | 0xd61f0220, /* br x17 */ | |
3414 | 0xd503201f, /* nop */ | |
3415 | 0xd503201f, /* nop */ | |
3416 | 0xd503201f, /* nop */ | |
3417 | }; | |
3418 | ||
83a01957 | 3419 | |
053a4d68 JY |
3420 | template<> |
3421 | const uint32_t | |
3422 | Output_data_plt_aarch64_standard<64, false>:: | |
3423 | first_plt_entry[first_plt_entry_size / 4] = | |
3424 | { | |
3425 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
3426 | 0x90000010, /* adrp x16, PLT_GOT+16 */ | |
3427 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ | |
3428 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ | |
3429 | 0xd61f0220, /* br x17 */ | |
3430 | 0xd503201f, /* nop */ | |
3431 | 0xd503201f, /* nop */ | |
3432 | 0xd503201f, /* nop */ | |
3433 | }; | |
3434 | ||
83a01957 | 3435 | |
053a4d68 JY |
3436 | template<> |
3437 | const uint32_t | |
3438 | Output_data_plt_aarch64_standard<64, true>:: | |
3439 | first_plt_entry[first_plt_entry_size / 4] = | |
3440 | { | |
3441 | 0xa9bf7bf0, /* stp x16, x30, [sp, #-16]! */ | |
3442 | 0x90000010, /* adrp x16, PLT_GOT+16 */ | |
3443 | 0xf9400A11, /* ldr x17, [x16, #PLT_GOT+0x10] */ | |
3444 | 0x91004210, /* add x16, x16,#PLT_GOT+0x10 */ | |
3445 | 0xd61f0220, /* br x17 */ | |
3446 | 0xd503201f, /* nop */ | |
3447 | 0xd503201f, /* nop */ | |
3448 | 0xd503201f, /* nop */ | |
3449 | }; | |
3450 | ||
83a01957 | 3451 | |
053a4d68 JY |
3452 | template<> |
3453 | const uint32_t | |
3454 | Output_data_plt_aarch64_standard<32, false>:: | |
3455 | plt_entry[plt_entry_size / 4] = | |
3456 | { | |
3457 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ | |
3458 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ | |
3459 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ | |
3460 | 0xd61f0220, /* br x17. */ | |
3461 | }; | |
3462 | ||
83a01957 | 3463 | |
053a4d68 JY |
3464 | template<> |
3465 | const uint32_t | |
3466 | Output_data_plt_aarch64_standard<32, true>:: | |
3467 | plt_entry[plt_entry_size / 4] = | |
3468 | { | |
3469 | 0x90000010, /* adrp x16, PLTGOT + n * 4 */ | |
3470 | 0xb9400211, /* ldr w17, [w16, PLTGOT + n * 4] */ | |
3471 | 0x11000210, /* add w16, w16, :lo12:PLTGOT + n * 4 */ | |
3472 | 0xd61f0220, /* br x17. */ | |
3473 | }; | |
3474 | ||
83a01957 | 3475 | |
053a4d68 JY |
3476 | template<> |
3477 | const uint32_t | |
3478 | Output_data_plt_aarch64_standard<64, false>:: | |
3479 | plt_entry[plt_entry_size / 4] = | |
3480 | { | |
3481 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ | |
3482 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ | |
3483 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ | |
3484 | 0xd61f0220, /* br x17. */ | |
3485 | }; | |
3486 | ||
83a01957 | 3487 | |
053a4d68 JY |
3488 | template<> |
3489 | const uint32_t | |
3490 | Output_data_plt_aarch64_standard<64, true>:: | |
3491 | plt_entry[plt_entry_size / 4] = | |
3492 | { | |
3493 | 0x90000010, /* adrp x16, PLTGOT + n * 8 */ | |
3494 | 0xf9400211, /* ldr x17, [x16, PLTGOT + n * 8] */ | |
3495 | 0x91000210, /* add x16, x16, :lo12:PLTGOT + n * 8 */ | |
3496 | 0xd61f0220, /* br x17. */ | |
3497 | }; | |
3498 | ||
83a01957 | 3499 | |
053a4d68 JY |
3500 | template<int size, bool big_endian> |
3501 | void | |
3502 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_first_plt_entry( | |
3503 | unsigned char* pov, | |
9363c7c3 JY |
3504 | Address got_address, |
3505 | Address plt_address) | |
053a4d68 JY |
3506 | { |
3507 | // PLT0 of the small PLT looks like this in ELF64 - | |
3508 | // stp x16, x30, [sp, #-16]! Save the reloc and lr on stack. | |
3509 | // adrp x16, PLT_GOT + 16 Get the page base of the GOTPLT | |
3510 | // ldr x17, [x16, #:lo12:PLT_GOT+16] Load the address of the | |
3511 | // symbol resolver | |
3512 | // add x16, x16, #:lo12:PLT_GOT+16 Load the lo12 bits of the | |
3513 | // GOTPLT entry for this. | |
3514 | // br x17 | |
3515 | // PLT0 will be slightly different in ELF32 due to different got entry | |
3516 | // size. | |
3517 | memcpy(pov, this->first_plt_entry, this->first_plt_entry_size); | |
9363c7c3 JY |
3518 | Address gotplt_2nd_ent = got_address + (size / 8) * 2; |
3519 | ||
3520 | // Fill in the top 21 bits for this: ADRP x16, PLT_GOT + 8 * 2. | |
3521 | // ADRP: (PG(S+A)-PG(P)) >> 12) & 0x1fffff. | |
3522 | // FIXME: This only works for 64bit | |
3523 | AArch64_relocate_functions<size, big_endian>::adrp(pov + 4, | |
3524 | gotplt_2nd_ent, plt_address + 4); | |
3525 | ||
3526 | // Fill in R_AARCH64_LDST8_LO12 | |
3527 | elfcpp::Swap<32, big_endian>::writeval( | |
3528 | pov + 8, | |
3529 | ((this->first_plt_entry[2] & 0xffc003ff) | |
3530 | | ((gotplt_2nd_ent & 0xff8) << 7))); | |
3531 | ||
3532 | // Fill in R_AARCH64_ADD_ABS_LO12 | |
3533 | elfcpp::Swap<32, big_endian>::writeval( | |
3534 | pov + 12, | |
3535 | ((this->first_plt_entry[3] & 0xffc003ff) | |
3536 | | ((gotplt_2nd_ent & 0xfff) << 10))); | |
053a4d68 JY |
3537 | } |
3538 | ||
83a01957 | 3539 | |
053a4d68 | 3540 | // Subsequent entries in the PLT for an executable. |
9363c7c3 | 3541 | // FIXME: This only works for 64bit |
053a4d68 JY |
3542 | |
3543 | template<int size, bool big_endian> | |
3544 | void | |
3545 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_plt_entry( | |
3546 | unsigned char* pov, | |
9363c7c3 JY |
3547 | Address got_address, |
3548 | Address plt_address, | |
3549 | unsigned int got_offset, | |
3550 | unsigned int plt_offset) | |
053a4d68 JY |
3551 | { |
3552 | memcpy(pov, this->plt_entry, this->plt_entry_size); | |
9363c7c3 JY |
3553 | |
3554 | Address gotplt_entry_address = got_address + got_offset; | |
3555 | Address plt_entry_address = plt_address + plt_offset; | |
3556 | ||
3557 | // Fill in R_AARCH64_PCREL_ADR_HI21 | |
3558 | AArch64_relocate_functions<size, big_endian>::adrp( | |
3559 | pov, | |
3560 | gotplt_entry_address, | |
3561 | plt_entry_address); | |
3562 | ||
3563 | // Fill in R_AARCH64_LDST64_ABS_LO12 | |
3564 | elfcpp::Swap<32, big_endian>::writeval( | |
3565 | pov + 4, | |
3566 | ((this->plt_entry[1] & 0xffc003ff) | |
3567 | | ((gotplt_entry_address & 0xff8) << 7))); | |
3568 | ||
3569 | // Fill in R_AARCH64_ADD_ABS_LO12 | |
3570 | elfcpp::Swap<32, big_endian>::writeval( | |
3571 | pov + 8, | |
3572 | ((this->plt_entry[2] & 0xffc003ff) | |
3573 | | ((gotplt_entry_address & 0xfff) <<10))); | |
3574 | ||
053a4d68 JY |
3575 | } |
3576 | ||
3a531937 JY |
3577 | |
3578 | template<> | |
3579 | const uint32_t | |
3580 | Output_data_plt_aarch64_standard<32, false>:: | |
3581 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
3582 | { | |
3583 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
3584 | 0x90000002, /* adrp x2, 0 */ | |
3585 | 0x90000003, /* adrp x3, 0 */ | |
3586 | 0xb9400042, /* ldr w2, [w2, #0] */ | |
3587 | 0x11000063, /* add w3, w3, 0 */ | |
3588 | 0xd61f0040, /* br x2 */ | |
3589 | 0xd503201f, /* nop */ | |
3590 | 0xd503201f, /* nop */ | |
3591 | }; | |
3592 | ||
3593 | template<> | |
3594 | const uint32_t | |
3595 | Output_data_plt_aarch64_standard<32, true>:: | |
3596 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
3597 | { | |
3598 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
3599 | 0x90000002, /* adrp x2, 0 */ | |
3600 | 0x90000003, /* adrp x3, 0 */ | |
3601 | 0xb9400042, /* ldr w2, [w2, #0] */ | |
3602 | 0x11000063, /* add w3, w3, 0 */ | |
3603 | 0xd61f0040, /* br x2 */ | |
3604 | 0xd503201f, /* nop */ | |
3605 | 0xd503201f, /* nop */ | |
3606 | }; | |
3607 | ||
3608 | template<> | |
3609 | const uint32_t | |
3610 | Output_data_plt_aarch64_standard<64, false>:: | |
3611 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
3612 | { | |
3613 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
3614 | 0x90000002, /* adrp x2, 0 */ | |
3615 | 0x90000003, /* adrp x3, 0 */ | |
3616 | 0xf9400042, /* ldr x2, [x2, #0] */ | |
3617 | 0x91000063, /* add x3, x3, 0 */ | |
3618 | 0xd61f0040, /* br x2 */ | |
3619 | 0xd503201f, /* nop */ | |
3620 | 0xd503201f, /* nop */ | |
3621 | }; | |
3622 | ||
3623 | template<> | |
3624 | const uint32_t | |
3625 | Output_data_plt_aarch64_standard<64, true>:: | |
3626 | tlsdesc_plt_entry[plt_tlsdesc_entry_size / 4] = | |
3627 | { | |
3628 | 0xa9bf0fe2, /* stp x2, x3, [sp, #-16]! */ | |
3629 | 0x90000002, /* adrp x2, 0 */ | |
3630 | 0x90000003, /* adrp x3, 0 */ | |
3631 | 0xf9400042, /* ldr x2, [x2, #0] */ | |
3632 | 0x91000063, /* add x3, x3, 0 */ | |
3633 | 0xd61f0040, /* br x2 */ | |
3634 | 0xd503201f, /* nop */ | |
3635 | 0xd503201f, /* nop */ | |
3636 | }; | |
3637 | ||
3638 | template<int size, bool big_endian> | |
3639 | void | |
3640 | Output_data_plt_aarch64_standard<size, big_endian>::do_fill_tlsdesc_entry( | |
3641 | unsigned char* pov, | |
3642 | Address gotplt_address, | |
3643 | Address plt_address, | |
3644 | Address got_base, | |
3645 | unsigned int tlsdesc_got_offset, | |
3646 | unsigned int plt_offset) | |
3647 | { | |
3648 | memcpy(pov, tlsdesc_plt_entry, plt_tlsdesc_entry_size); | |
3649 | ||
3650 | // move DT_TLSDESC_GOT address into x2 | |
3651 | // move .got.plt address into x3 | |
3652 | Address tlsdesc_got_entry = got_base + tlsdesc_got_offset; | |
3653 | Address plt_entry_address = plt_address + plt_offset; | |
3654 | ||
3655 | // R_AARCH64_ADR_PREL_PG_HI21 | |
3656 | AArch64_relocate_functions<size, big_endian>::adrp( | |
3657 | pov + 4, | |
3658 | tlsdesc_got_entry, | |
3659 | plt_entry_address + 4); | |
3660 | ||
3661 | // R_AARCH64_ADR_PREL_PG_HI21 | |
3662 | AArch64_relocate_functions<size, big_endian>::adrp( | |
3663 | pov + 8, | |
3664 | gotplt_address, | |
3665 | plt_entry_address + 8); | |
3666 | ||
3667 | // R_AARCH64_LDST64_ABS_LO12 | |
3668 | elfcpp::Swap<32, big_endian>::writeval( | |
3669 | pov + 12, | |
3670 | ((this->tlsdesc_plt_entry[3] & 0xffc003ff) | |
3671 | | ((tlsdesc_got_entry & 0xff8) << 7))); | |
3672 | ||
3673 | // R_AARCH64_ADD_ABS_LO12 | |
3674 | elfcpp::Swap<32, big_endian>::writeval( | |
3675 | pov + 16, | |
3676 | ((this->tlsdesc_plt_entry[4] & 0xffc003ff) | |
3677 | | ((gotplt_address & 0xfff) << 10))); | |
3678 | } | |
3679 | ||
053a4d68 JY |
3680 | // Write out the PLT. This uses the hand-coded instructions above, |
3681 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
3682 | ||
3683 | template<int size, bool big_endian> | |
3684 | void | |
3685 | Output_data_plt_aarch64<size, big_endian>::do_write(Output_file* of) | |
3686 | { | |
3687 | const off_t offset = this->offset(); | |
3688 | const section_size_type oview_size = | |
3689 | convert_to_section_size_type(this->data_size()); | |
3690 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
3691 | ||
3692 | const off_t got_file_offset = this->got_plt_->offset(); | |
9726c3c1 HS |
3693 | gold_assert(got_file_offset + this->got_plt_->data_size() |
3694 | == this->got_irelative_->offset()); | |
3695 | ||
053a4d68 | 3696 | const section_size_type got_size = |
9726c3c1 HS |
3697 | convert_to_section_size_type(this->got_plt_->data_size() |
3698 | + this->got_irelative_->data_size()); | |
053a4d68 JY |
3699 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
3700 | got_size); | |
3701 | ||
3702 | unsigned char* pov = oview; | |
3703 | ||
3704 | // The base address of the .plt section. | |
3705 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); | |
053a4d68 | 3706 | // The base address of the PLT portion of the .got section. |
3a531937 JY |
3707 | typename elfcpp::Elf_types<size>::Elf_Addr gotplt_address |
3708 | = this->got_plt_->address(); | |
053a4d68 | 3709 | |
3a531937 | 3710 | this->fill_first_plt_entry(pov, gotplt_address, plt_address); |
053a4d68 JY |
3711 | pov += this->first_plt_entry_offset(); |
3712 | ||
3713 | // The first three entries in .got.plt are reserved. | |
3714 | unsigned char* got_pov = got_view; | |
3715 | memset(got_pov, 0, size / 8 * AARCH64_GOTPLT_RESERVE_COUNT); | |
3716 | got_pov += (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; | |
3717 | ||
3718 | unsigned int plt_offset = this->first_plt_entry_offset(); | |
3719 | unsigned int got_offset = (size / 8) * AARCH64_GOTPLT_RESERVE_COUNT; | |
3a531937 | 3720 | const unsigned int count = this->count_ + this->irelative_count_; |
053a4d68 JY |
3721 | for (unsigned int plt_index = 0; |
3722 | plt_index < count; | |
3723 | ++plt_index, | |
3724 | pov += this->get_plt_entry_size(), | |
3725 | got_pov += size / 8, | |
3726 | plt_offset += this->get_plt_entry_size(), | |
3727 | got_offset += size / 8) | |
3728 | { | |
3729 | // Set and adjust the PLT entry itself. | |
3a531937 | 3730 | this->fill_plt_entry(pov, gotplt_address, plt_address, |
9363c7c3 | 3731 | got_offset, plt_offset); |
053a4d68 | 3732 | |
9363c7c3 JY |
3733 | // Set the entry in the GOT, which points to plt0. |
3734 | elfcpp::Swap<size, big_endian>::writeval(got_pov, plt_address); | |
053a4d68 JY |
3735 | } |
3736 | ||
3a531937 JY |
3737 | if (this->has_tlsdesc_entry()) |
3738 | { | |
3739 | // Set and adjust the reserved TLSDESC PLT entry. | |
3740 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
3741 | // The base address of the .base section. | |
3742 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = | |
3743 | this->got_->address(); | |
3744 | this->fill_tlsdesc_entry(pov, gotplt_address, plt_address, got_base, | |
3745 | tlsdesc_got_offset, plt_offset); | |
3746 | pov += this->get_plt_tlsdesc_entry_size(); | |
3747 | } | |
3748 | ||
053a4d68 JY |
3749 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
3750 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
3751 | ||
3752 | of->write_output_view(offset, oview_size, oview); | |
3753 | of->write_output_view(got_file_offset, got_size, got_view); | |
3754 | } | |
3755 | ||
9363c7c3 JY |
3756 | // Telling how to update the immediate field of an instruction. |
3757 | struct AArch64_howto | |
3758 | { | |
3759 | // The immediate field mask. | |
3760 | elfcpp::Elf_Xword dst_mask; | |
3761 | ||
3762 | // The offset to apply relocation immediate | |
3763 | int doffset; | |
3764 | ||
3765 | // The second part offset, if the immediate field has two parts. | |
3766 | // -1 if the immediate field has only one part. | |
3767 | int doffset2; | |
3768 | }; | |
3769 | ||
3770 | static const AArch64_howto aarch64_howto[AArch64_reloc_property::INST_NUM] = | |
3771 | { | |
3772 | {0, -1, -1}, // DATA | |
3773 | {0x1fffe0, 5, -1}, // MOVW [20:5]-imm16 | |
3774 | {0xffffe0, 5, -1}, // LD [23:5]-imm19 | |
3775 | {0x60ffffe0, 29, 5}, // ADR [30:29]-immlo [23:5]-immhi | |
3776 | {0x60ffffe0, 29, 5}, // ADRP [30:29]-immlo [23:5]-immhi | |
3777 | {0x3ffc00, 10, -1}, // ADD [21:10]-imm12 | |
3778 | {0x3ffc00, 10, -1}, // LDST [21:10]-imm12 | |
3779 | {0x7ffe0, 5, -1}, // TBZNZ [18:5]-imm14 | |
3780 | {0xffffe0, 5, -1}, // CONDB [23:5]-imm19 | |
3781 | {0x3ffffff, 0, -1}, // B [25:0]-imm26 | |
3782 | {0x3ffffff, 0, -1}, // CALL [25:0]-imm26 | |
3783 | }; | |
3784 | ||
3785 | // AArch64 relocate function class | |
3786 | ||
3787 | template<int size, bool big_endian> | |
3788 | class AArch64_relocate_functions | |
3789 | { | |
3790 | public: | |
3791 | typedef enum | |
3792 | { | |
3793 | STATUS_OKAY, // No error during relocation. | |
3794 | STATUS_OVERFLOW, // Relocation overflow. | |
3795 | STATUS_BAD_RELOC, // Relocation cannot be applied. | |
3796 | } Status; | |
3797 | ||
9363c7c3 JY |
3798 | typedef AArch64_relocate_functions<size, big_endian> This; |
3799 | typedef typename elfcpp::Elf_types<size>::Elf_Addr Address; | |
83a01957 HS |
3800 | typedef Relocate_info<size, big_endian> The_relocate_info; |
3801 | typedef AArch64_relobj<size, big_endian> The_aarch64_relobj; | |
3802 | typedef Reloc_stub<size, big_endian> The_reloc_stub; | |
3803 | typedef typename The_reloc_stub::Stub_type The_reloc_stub_type; | |
3804 | typedef Stub_table<size, big_endian> The_stub_table; | |
3805 | typedef elfcpp::Rela<size, big_endian> The_rela; | |
9726c3c1 | 3806 | typedef typename elfcpp::Swap<size, big_endian>::Valtype AArch64_valtype; |
9363c7c3 JY |
3807 | |
3808 | // Return the page address of the address. | |
3809 | // Page(address) = address & ~0xFFF | |
3810 | ||
9726c3c1 | 3811 | static inline AArch64_valtype |
9363c7c3 JY |
3812 | Page(Address address) |
3813 | { | |
3814 | return (address & (~static_cast<Address>(0xFFF))); | |
3815 | } | |
3816 | ||
83a01957 | 3817 | private: |
9363c7c3 JY |
3818 | // Update instruction (pointed by view) with selected bits (immed). |
3819 | // val = (val & ~dst_mask) | (immed << doffset) | |
3820 | ||
3821 | template<int valsize> | |
3822 | static inline void | |
3823 | update_view(unsigned char* view, | |
9726c3c1 | 3824 | AArch64_valtype immed, |
9363c7c3 JY |
3825 | elfcpp::Elf_Xword doffset, |
3826 | elfcpp::Elf_Xword dst_mask) | |
3827 | { | |
3828 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
3829 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
3830 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
3831 | ||
3832 | // Clear immediate fields. | |
3833 | val &= ~dst_mask; | |
3834 | elfcpp::Swap<valsize, big_endian>::writeval(wv, | |
3835 | static_cast<Valtype>(val | (immed << doffset))); | |
3836 | } | |
3837 | ||
3838 | // Update two parts of an instruction (pointed by view) with selected | |
3839 | // bits (immed1 and immed2). | |
3840 | // val = (val & ~dst_mask) | (immed1 << doffset1) | (immed2 << doffset2) | |
3841 | ||
3842 | template<int valsize> | |
3843 | static inline void | |
3844 | update_view_two_parts( | |
3845 | unsigned char* view, | |
9726c3c1 HS |
3846 | AArch64_valtype immed1, |
3847 | AArch64_valtype immed2, | |
9363c7c3 JY |
3848 | elfcpp::Elf_Xword doffset1, |
3849 | elfcpp::Elf_Xword doffset2, | |
3850 | elfcpp::Elf_Xword dst_mask) | |
3851 | { | |
3852 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; | |
3853 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
3854 | Valtype val = elfcpp::Swap<valsize, big_endian>::readval(wv); | |
3855 | val &= ~dst_mask; | |
3856 | elfcpp::Swap<valsize, big_endian>::writeval(wv, | |
3857 | static_cast<Valtype>(val | (immed1 << doffset1) | | |
3858 | (immed2 << doffset2))); | |
3859 | } | |
3860 | ||
9726c3c1 | 3861 | // Update adr or adrp instruction with immed. |
9363c7c3 JY |
3862 | // In adr and adrp: [30:29] immlo [23:5] immhi |
3863 | ||
3864 | static inline void | |
9726c3c1 | 3865 | update_adr(unsigned char* view, AArch64_valtype immed) |
9363c7c3 JY |
3866 | { |
3867 | elfcpp::Elf_Xword dst_mask = (0x3 << 29) | (0x7ffff << 5); | |
9363c7c3 JY |
3868 | This::template update_view_two_parts<32>( |
3869 | view, | |
3870 | immed & 0x3, | |
3871 | (immed & 0x1ffffc) >> 2, | |
3872 | 29, | |
3873 | 5, | |
3874 | dst_mask); | |
3875 | } | |
3876 | ||
3a531937 JY |
3877 | // Update movz/movn instruction with bits immed. |
3878 | // Set instruction to movz if is_movz is true, otherwise set instruction | |
3879 | // to movn. | |
9726c3c1 | 3880 | |
3a531937 JY |
3881 | static inline void |
3882 | update_movnz(unsigned char* view, | |
9726c3c1 | 3883 | AArch64_valtype immed, |
3a531937 JY |
3884 | bool is_movz) |
3885 | { | |
3886 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Valtype; | |
3887 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
3888 | Valtype val = elfcpp::Swap<32, big_endian>::readval(wv); | |
3889 | ||
3890 | const elfcpp::Elf_Xword doffset = | |
3891 | aarch64_howto[AArch64_reloc_property::INST_MOVW].doffset; | |
3892 | const elfcpp::Elf_Xword dst_mask = | |
3893 | aarch64_howto[AArch64_reloc_property::INST_MOVW].dst_mask; | |
3894 | ||
3895 | // Clear immediate fields and opc code. | |
9726c3c1 | 3896 | val &= ~(dst_mask | (0x3 << 29)); |
3a531937 JY |
3897 | |
3898 | // Set instruction to movz or movn. | |
3899 | // movz: [30:29] is 10 movn: [30:29] is 00 | |
3900 | if (is_movz) | |
9726c3c1 | 3901 | val |= (0x2 << 29); |
3a531937 JY |
3902 | |
3903 | elfcpp::Swap<32, big_endian>::writeval(wv, | |
3904 | static_cast<Valtype>(val | (immed << doffset))); | |
3905 | } | |
3906 | ||
9726c3c1 HS |
3907 | // Update selected bits in text. |
3908 | ||
3909 | template<int valsize> | |
3910 | static inline typename This::Status | |
3911 | reloc_common(unsigned char* view, Address x, | |
3912 | const AArch64_reloc_property* reloc_property) | |
3913 | { | |
3914 | // Select bits from X. | |
3915 | Address immed = reloc_property->select_x_value(x); | |
3916 | ||
3917 | // Update view. | |
3918 | const AArch64_reloc_property::Reloc_inst inst = | |
3919 | reloc_property->reloc_inst(); | |
3920 | // If it is a data relocation or instruction has 2 parts of immediate | |
3921 | // fields, you should not call pcrela_general. | |
3922 | gold_assert(aarch64_howto[inst].doffset2 == -1 && | |
3923 | aarch64_howto[inst].doffset != -1); | |
3924 | This::template update_view<valsize>(view, immed, | |
3925 | aarch64_howto[inst].doffset, | |
3926 | aarch64_howto[inst].dst_mask); | |
3927 | ||
3928 | // Do check overflow or alignment if needed. | |
3929 | return (reloc_property->checkup_x_value(x) | |
3930 | ? This::STATUS_OKAY | |
3931 | : This::STATUS_OVERFLOW); | |
3932 | } | |
3933 | ||
9363c7c3 JY |
3934 | public: |
3935 | ||
3936 | // Do a simple rela relocation at unaligned addresses. | |
3937 | ||
3938 | template<int valsize> | |
3939 | static inline typename This::Status | |
3940 | rela_ua(unsigned char* view, | |
3941 | const Sized_relobj_file<size, big_endian>* object, | |
3942 | const Symbol_value<size>* psymval, | |
9726c3c1 | 3943 | AArch64_valtype addend, |
9363c7c3 JY |
3944 | const AArch64_reloc_property* reloc_property) |
3945 | { | |
3946 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
3947 | Valtype; | |
3948 | typename elfcpp::Elf_types<size>::Elf_Addr x = | |
3949 | psymval->value(object, addend); | |
3950 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, | |
3951 | static_cast<Valtype>(x)); | |
3952 | return (reloc_property->checkup_x_value(x) | |
3953 | ? This::STATUS_OKAY | |
3954 | : This::STATUS_OVERFLOW); | |
3955 | } | |
3956 | ||
3957 | // Do a simple pc-relative relocation at unaligned addresses. | |
3958 | ||
3959 | template<int valsize> | |
3960 | static inline typename This::Status | |
3961 | pcrela_ua(unsigned char* view, | |
3962 | const Sized_relobj_file<size, big_endian>* object, | |
3963 | const Symbol_value<size>* psymval, | |
9726c3c1 | 3964 | AArch64_valtype addend, |
9363c7c3 JY |
3965 | Address address, |
3966 | const AArch64_reloc_property* reloc_property) | |
3967 | { | |
3968 | typedef typename elfcpp::Swap_unaligned<valsize, big_endian>::Valtype | |
3969 | Valtype; | |
3a531937 | 3970 | Address x = psymval->value(object, addend) - address; |
9363c7c3 JY |
3971 | elfcpp::Swap_unaligned<valsize, big_endian>::writeval(view, |
3972 | static_cast<Valtype>(x)); | |
3973 | return (reloc_property->checkup_x_value(x) | |
3974 | ? This::STATUS_OKAY | |
3975 | : This::STATUS_OVERFLOW); | |
3976 | } | |
3977 | ||
3978 | // Do a simple rela relocation at aligned addresses. | |
3979 | ||
3980 | template<int valsize> | |
3981 | static inline typename This::Status | |
3982 | rela( | |
3983 | unsigned char* view, | |
3984 | const Sized_relobj_file<size, big_endian>* object, | |
3985 | const Symbol_value<size>* psymval, | |
9726c3c1 | 3986 | AArch64_valtype addend, |
9363c7c3 JY |
3987 | const AArch64_reloc_property* reloc_property) |
3988 | { | |
9726c3c1 | 3989 | typedef typename elfcpp::Swap<valsize, big_endian>::Valtype Valtype; |
9363c7c3 | 3990 | Valtype* wv = reinterpret_cast<Valtype*>(view); |
3a531937 | 3991 | Address x = psymval->value(object, addend); |
9726c3c1 | 3992 | elfcpp::Swap<valsize, big_endian>::writeval(wv,static_cast<Valtype>(x)); |
9363c7c3 JY |
3993 | return (reloc_property->checkup_x_value(x) |
3994 | ? This::STATUS_OKAY | |
3995 | : This::STATUS_OVERFLOW); | |
3996 | } | |
3997 | ||
3998 | // Do relocate. Update selected bits in text. | |
3999 | // new_val = (val & ~dst_mask) | (immed << doffset) | |
4000 | ||
4001 | template<int valsize> | |
4002 | static inline typename This::Status | |
4003 | rela_general(unsigned char* view, | |
4004 | const Sized_relobj_file<size, big_endian>* object, | |
4005 | const Symbol_value<size>* psymval, | |
9726c3c1 | 4006 | AArch64_valtype addend, |
9363c7c3 JY |
4007 | const AArch64_reloc_property* reloc_property) |
4008 | { | |
4009 | // Calculate relocation. | |
83a01957 | 4010 | Address x = psymval->value(object, addend); |
9726c3c1 | 4011 | return This::template reloc_common<valsize>(view, x, reloc_property); |
9363c7c3 JY |
4012 | } |
4013 | ||
4014 | // Do relocate. Update selected bits in text. | |
4015 | // new val = (val & ~dst_mask) | (immed << doffset) | |
4016 | ||
4017 | template<int valsize> | |
4018 | static inline typename This::Status | |
4019 | rela_general( | |
4020 | unsigned char* view, | |
9726c3c1 HS |
4021 | AArch64_valtype s, |
4022 | AArch64_valtype addend, | |
9363c7c3 JY |
4023 | const AArch64_reloc_property* reloc_property) |
4024 | { | |
4025 | // Calculate relocation. | |
4026 | Address x = s + addend; | |
9726c3c1 | 4027 | return This::template reloc_common<valsize>(view, x, reloc_property); |
9363c7c3 JY |
4028 | } |
4029 | ||
4030 | // Do address relative relocate. Update selected bits in text. | |
4031 | // new val = (val & ~dst_mask) | (immed << doffset) | |
4032 | ||
4033 | template<int valsize> | |
4034 | static inline typename This::Status | |
4035 | pcrela_general( | |
4036 | unsigned char* view, | |
4037 | const Sized_relobj_file<size, big_endian>* object, | |
4038 | const Symbol_value<size>* psymval, | |
9726c3c1 | 4039 | AArch64_valtype addend, |
9363c7c3 JY |
4040 | Address address, |
4041 | const AArch64_reloc_property* reloc_property) | |
4042 | { | |
4043 | // Calculate relocation. | |
3a531937 | 4044 | Address x = psymval->value(object, addend) - address; |
9726c3c1 HS |
4045 | return This::template reloc_common<valsize>(view, x, reloc_property); |
4046 | } | |
9363c7c3 | 4047 | |
9363c7c3 | 4048 | |
9726c3c1 | 4049 | // Calculate (S + A) - address, update adr instruction. |
9363c7c3 | 4050 | |
9726c3c1 HS |
4051 | static inline typename This::Status |
4052 | adr(unsigned char* view, | |
4053 | const Sized_relobj_file<size, big_endian>* object, | |
4054 | const Symbol_value<size>* psymval, | |
4055 | Address addend, | |
4056 | Address address, | |
4057 | const AArch64_reloc_property* /* reloc_property */) | |
4058 | { | |
4059 | AArch64_valtype x = psymval->value(object, addend) - address; | |
4060 | // Pick bits [20:0] of X. | |
4061 | AArch64_valtype immed = x & 0x1fffff; | |
4062 | update_adr(view, immed); | |
4063 | // Check -2^20 <= X < 2^20 | |
4064 | return (size == 64 && Bits<21>::has_overflow((x)) | |
4065 | ? This::STATUS_OVERFLOW | |
4066 | : This::STATUS_OKAY); | |
9363c7c3 JY |
4067 | } |
4068 | ||
4069 | // Calculate PG(S+A) - PG(address), update adrp instruction. | |
4070 | // R_AARCH64_ADR_PREL_PG_HI21 | |
4071 | ||
4072 | static inline typename This::Status | |
4073 | adrp( | |
4074 | unsigned char* view, | |
4075 | Address sa, | |
4076 | Address address) | |
4077 | { | |
9726c3c1 HS |
4078 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
4079 | // Pick [32:12] of X. | |
4080 | AArch64_valtype immed = (x >> 12) & 0x1fffff; | |
4081 | update_adr(view, immed); | |
83a01957 HS |
4082 | // Check -2^32 <= X < 2^32 |
4083 | return (size == 64 && Bits<33>::has_overflow((x)) | |
9363c7c3 JY |
4084 | ? This::STATUS_OVERFLOW |
4085 | : This::STATUS_OKAY); | |
4086 | } | |
4087 | ||
4088 | // Calculate PG(S+A) - PG(address), update adrp instruction. | |
4089 | // R_AARCH64_ADR_PREL_PG_HI21 | |
4090 | ||
4091 | static inline typename This::Status | |
4092 | adrp(unsigned char* view, | |
4093 | const Sized_relobj_file<size, big_endian>* object, | |
4094 | const Symbol_value<size>* psymval, | |
4095 | Address addend, | |
4096 | Address address, | |
4097 | const AArch64_reloc_property* reloc_property) | |
4098 | { | |
4099 | Address sa = psymval->value(object, addend); | |
9726c3c1 HS |
4100 | AArch64_valtype x = This::Page(sa) - This::Page(address); |
4101 | // Pick [32:12] of X. | |
4102 | AArch64_valtype immed = (x >> 12) & 0x1fffff; | |
4103 | update_adr(view, immed); | |
9363c7c3 JY |
4104 | return (reloc_property->checkup_x_value(x) |
4105 | ? This::STATUS_OKAY | |
4106 | : This::STATUS_OVERFLOW); | |
4107 | } | |
4108 | ||
3a531937 JY |
4109 | // Update mov[n/z] instruction. Check overflow if needed. |
4110 | // If X >=0, set the instruction to movz and its immediate value to the | |
4111 | // selected bits S. | |
4112 | // If X < 0, set the instruction to movn and its immediate value to | |
4113 | // NOT (selected bits of). | |
4114 | ||
4115 | static inline typename This::Status | |
4116 | movnz(unsigned char* view, | |
9726c3c1 | 4117 | AArch64_valtype x, |
3a531937 JY |
4118 | const AArch64_reloc_property* reloc_property) |
4119 | { | |
4120 | // Select bits from X. | |
9726c3c1 HS |
4121 | Address immed; |
4122 | bool is_movz; | |
4123 | typedef typename elfcpp::Elf_types<size>::Elf_Swxword SignedW; | |
4124 | if (static_cast<SignedW>(x) >= 0) | |
4125 | { | |
4126 | immed = reloc_property->select_x_value(x); | |
4127 | is_movz = true; | |
4128 | } | |
4129 | else | |
3a531937 | 4130 | { |
9726c3c1 | 4131 | immed = reloc_property->select_x_value(~x);; |
3a531937 JY |
4132 | is_movz = false; |
4133 | } | |
4134 | ||
4135 | // Update movnz instruction. | |
4136 | update_movnz(view, immed, is_movz); | |
4137 | ||
4138 | // Do check overflow or alignment if needed. | |
4139 | return (reloc_property->checkup_x_value(x) | |
4140 | ? This::STATUS_OKAY | |
4141 | : This::STATUS_OVERFLOW); | |
4142 | } | |
4143 | ||
83a01957 HS |
4144 | static inline bool |
4145 | maybe_apply_stub(unsigned int, | |
4146 | const The_relocate_info*, | |
4147 | const The_rela&, | |
4148 | unsigned char*, | |
4149 | Address, | |
4150 | const Sized_symbol<size>*, | |
4151 | const Symbol_value<size>*, | |
0bf32ea9 JY |
4152 | const Sized_relobj_file<size, big_endian>*, |
4153 | section_size_type); | |
83a01957 | 4154 | |
3a531937 JY |
4155 | }; // End of AArch64_relocate_functions |
4156 | ||
4157 | ||
83a01957 HS |
4158 | // For a certain relocation type (usually jump/branch), test to see if the |
4159 | // destination needs a stub to fulfil. If so, re-route the destination of the | |
4160 | // original instruction to the stub, note, at this time, the stub has already | |
4161 | // been generated. | |
4162 | ||
4163 | template<int size, bool big_endian> | |
4164 | bool | |
4165 | AArch64_relocate_functions<size, big_endian>:: | |
4166 | maybe_apply_stub(unsigned int r_type, | |
4167 | const The_relocate_info* relinfo, | |
4168 | const The_rela& rela, | |
4169 | unsigned char* view, | |
4170 | Address address, | |
4171 | const Sized_symbol<size>* gsym, | |
4172 | const Symbol_value<size>* psymval, | |
0bf32ea9 JY |
4173 | const Sized_relobj_file<size, big_endian>* object, |
4174 | section_size_type current_group_size) | |
83a01957 HS |
4175 | { |
4176 | if (parameters->options().relocatable()) | |
4177 | return false; | |
4178 | ||
4179 | typename elfcpp::Elf_types<size>::Elf_Swxword addend = rela.get_r_addend(); | |
4180 | Address branch_target = psymval->value(object, 0) + addend; | |
4181 | The_reloc_stub_type stub_type = The_reloc_stub:: | |
4182 | stub_type_for_reloc(r_type, address, branch_target); | |
4183 | if (stub_type == The_reloc_stub::ST_NONE) | |
4184 | return false; | |
4185 | ||
4186 | const The_aarch64_relobj* aarch64_relobj = | |
4187 | static_cast<const The_aarch64_relobj*>(object); | |
4188 | The_stub_table* stub_table = aarch64_relobj->stub_table(relinfo->data_shndx); | |
4189 | gold_assert(stub_table != NULL); | |
4190 | ||
4191 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4192 | typename The_reloc_stub::Key stub_key(stub_type, gsym, object, r_sym, addend); | |
4193 | The_reloc_stub* stub = stub_table->find_reloc_stub(stub_key); | |
4194 | gold_assert(stub != NULL); | |
4195 | ||
4196 | Address new_branch_target = stub_table->address() + stub->offset(); | |
4197 | typename elfcpp::Swap<size, big_endian>::Valtype branch_offset = | |
4198 | new_branch_target - address; | |
4199 | const AArch64_reloc_property* arp = | |
4200 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
4201 | gold_assert(arp != NULL); | |
aed56ec5 | 4202 | typename This::Status status = This::template |
83a01957 HS |
4203 | rela_general<32>(view, branch_offset, 0, arp); |
4204 | if (status != This::STATUS_OKAY) | |
4205 | gold_error(_("Stub is too far away, try a smaller value " | |
0bf32ea9 | 4206 | "for '--stub-group-size'. The current value is 0x%lx."), |
add6016b | 4207 | static_cast<unsigned long>(current_group_size)); |
83a01957 HS |
4208 | return true; |
4209 | } | |
4210 | ||
4211 | ||
4212 | // Group input sections for stub generation. | |
4213 | // | |
4214 | // We group input sections in an output section so that the total size, | |
4215 | // including any padding space due to alignment is smaller than GROUP_SIZE | |
4216 | // unless the only input section in group is bigger than GROUP_SIZE already. | |
4217 | // Then an ARM stub table is created to follow the last input section | |
4218 | // in group. For each group an ARM stub table is created an is placed | |
4219 | // after the last group. If STUB_ALWAYS_AFTER_BRANCH is false, we further | |
4220 | // extend the group after the stub table. | |
4221 | ||
4222 | template<int size, bool big_endian> | |
4223 | void | |
4224 | Target_aarch64<size, big_endian>::group_sections( | |
4225 | Layout* layout, | |
4226 | section_size_type group_size, | |
4227 | bool stubs_always_after_branch, | |
4228 | const Task* task) | |
4229 | { | |
4230 | // Group input sections and insert stub table | |
4231 | Layout::Section_list section_list; | |
4232 | layout->get_executable_sections(§ion_list); | |
4233 | for (Layout::Section_list::const_iterator p = section_list.begin(); | |
4234 | p != section_list.end(); | |
4235 | ++p) | |
4236 | { | |
4237 | AArch64_output_section<size, big_endian>* output_section = | |
4238 | static_cast<AArch64_output_section<size, big_endian>*>(*p); | |
4239 | output_section->group_sections(group_size, stubs_always_after_branch, | |
4240 | this, task); | |
4241 | } | |
4242 | } | |
4243 | ||
4244 | ||
4245 | // Find the AArch64_input_section object corresponding to the SHNDX-th input | |
4246 | // section of RELOBJ. | |
4247 | ||
4248 | template<int size, bool big_endian> | |
4249 | AArch64_input_section<size, big_endian>* | |
4250 | Target_aarch64<size, big_endian>::find_aarch64_input_section( | |
4251 | Relobj* relobj, unsigned int shndx) const | |
4252 | { | |
4253 | Section_id sid(relobj, shndx); | |
4254 | typename AArch64_input_section_map::const_iterator p = | |
4255 | this->aarch64_input_section_map_.find(sid); | |
4256 | return (p != this->aarch64_input_section_map_.end()) ? p->second : NULL; | |
4257 | } | |
4258 | ||
4259 | ||
4260 | // Make a new AArch64_input_section object. | |
4261 | ||
4262 | template<int size, bool big_endian> | |
4263 | AArch64_input_section<size, big_endian>* | |
4264 | Target_aarch64<size, big_endian>::new_aarch64_input_section( | |
4265 | Relobj* relobj, unsigned int shndx) | |
4266 | { | |
4267 | Section_id sid(relobj, shndx); | |
4268 | ||
4269 | AArch64_input_section<size, big_endian>* input_section = | |
4270 | new AArch64_input_section<size, big_endian>(relobj, shndx); | |
4271 | input_section->init(); | |
4272 | ||
4273 | // Register new AArch64_input_section in map for look-up. | |
4274 | std::pair<typename AArch64_input_section_map::iterator,bool> ins = | |
4275 | this->aarch64_input_section_map_.insert( | |
4276 | std::make_pair(sid, input_section)); | |
4277 | ||
4278 | // Make sure that it we have not created another AArch64_input_section | |
4279 | // for this input section already. | |
4280 | gold_assert(ins.second); | |
4281 | ||
4282 | return input_section; | |
4283 | } | |
4284 | ||
4285 | ||
4286 | // Relaxation hook. This is where we do stub generation. | |
4287 | ||
4288 | template<int size, bool big_endian> | |
4289 | bool | |
4290 | Target_aarch64<size, big_endian>::do_relax( | |
4291 | int pass, | |
4292 | const Input_objects* input_objects, | |
4293 | Symbol_table* symtab, | |
4294 | Layout* layout , | |
4295 | const Task* task) | |
4296 | { | |
4297 | gold_assert(!parameters->options().relocatable()); | |
4298 | if (pass == 1) | |
4299 | { | |
0bf32ea9 JY |
4300 | // We don't handle negative stub_group_size right now. |
4301 | this->stub_group_size_ = abs(parameters->options().stub_group_size()); | |
4302 | if (this->stub_group_size_ == 1) | |
83a01957 HS |
4303 | { |
4304 | // Leave room for 4096 4-byte stub entries. If we exceed that, then we | |
4305 | // will fail to link. The user will have to relink with an explicit | |
4306 | // group size option. | |
0bf32ea9 JY |
4307 | this->stub_group_size_ = The_reloc_stub::MAX_BRANCH_OFFSET - |
4308 | 4096 * 4; | |
83a01957 | 4309 | } |
0bf32ea9 | 4310 | group_sections(layout, this->stub_group_size_, true, task); |
83a01957 HS |
4311 | } |
4312 | else | |
4313 | { | |
4314 | // If this is not the first pass, addresses and file offsets have | |
4315 | // been reset at this point, set them here. | |
4316 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
4317 | sp != this->stub_tables_.end(); ++sp) | |
4318 | { | |
4319 | The_stub_table* stt = *sp; | |
4320 | The_aarch64_input_section* owner = stt->owner(); | |
4321 | off_t off = align_address(owner->original_size(), | |
4322 | stt->addralign()); | |
4323 | stt->set_address_and_file_offset(owner->address() + off, | |
4324 | owner->offset() + off); | |
4325 | } | |
4326 | } | |
4327 | ||
4328 | // Scan relocs for relocation stubs | |
4329 | for (Input_objects::Relobj_iterator op = input_objects->relobj_begin(); | |
4330 | op != input_objects->relobj_end(); | |
4331 | ++op) | |
4332 | { | |
4333 | The_aarch64_relobj* aarch64_relobj = | |
4334 | static_cast<The_aarch64_relobj*>(*op); | |
4335 | // Lock the object so we can read from it. This is only called | |
4336 | // single-threaded from Layout::finalize, so it is OK to lock. | |
4337 | Task_lock_obj<Object> tl(task, aarch64_relobj); | |
4338 | aarch64_relobj->scan_sections_for_stubs(this, symtab, layout); | |
4339 | } | |
4340 | ||
4341 | bool any_stub_table_changed = false; | |
4342 | for (Stub_table_iterator siter = this->stub_tables_.begin(); | |
4343 | siter != this->stub_tables_.end() && !any_stub_table_changed; ++siter) | |
4344 | { | |
4345 | The_stub_table* stub_table = *siter; | |
4346 | if (stub_table->update_data_size_changed_p()) | |
4347 | { | |
4348 | The_aarch64_input_section* owner = stub_table->owner(); | |
4349 | uint64_t address = owner->address(); | |
4350 | off_t offset = owner->offset(); | |
4351 | owner->reset_address_and_file_offset(); | |
4352 | owner->set_address_and_file_offset(address, offset); | |
4353 | ||
4354 | any_stub_table_changed = true; | |
4355 | } | |
4356 | } | |
4357 | ||
4358 | // Do not continue relaxation. | |
4359 | bool continue_relaxation = any_stub_table_changed; | |
4360 | if (!continue_relaxation) | |
4361 | for (Stub_table_iterator sp = this->stub_tables_.begin(); | |
4362 | (sp != this->stub_tables_.end()); | |
4363 | ++sp) | |
4364 | (*sp)->finalize_stubs(); | |
4365 | ||
4366 | return continue_relaxation; | |
4367 | } | |
4368 | ||
4369 | ||
4370 | // Make a new Stub_table. | |
4371 | ||
4372 | template<int size, bool big_endian> | |
4373 | Stub_table<size, big_endian>* | |
4374 | Target_aarch64<size, big_endian>::new_stub_table( | |
4375 | AArch64_input_section<size, big_endian>* owner) | |
4376 | { | |
4377 | Stub_table<size, big_endian>* stub_table = | |
4378 | new Stub_table<size, big_endian>(owner); | |
4379 | stub_table->set_address(align_address( | |
4380 | owner->address() + owner->data_size(), 8)); | |
4381 | stub_table->set_file_offset(owner->offset() + owner->data_size()); | |
4382 | stub_table->finalize_data_size(); | |
4383 | ||
4384 | this->stub_tables_.push_back(stub_table); | |
4385 | ||
4386 | return stub_table; | |
4387 | } | |
4388 | ||
4389 | ||
3a531937 | 4390 | template<int size, bool big_endian> |
7fa5525f | 4391 | uint64_t |
3a531937 | 4392 | Target_aarch64<size, big_endian>::do_reloc_addend( |
7fa5525f | 4393 | void* arg, unsigned int r_type, uint64_t) const |
3a531937 JY |
4394 | { |
4395 | gold_assert(r_type == elfcpp::R_AARCH64_TLSDESC); | |
4396 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
4397 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
4398 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
4399 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); | |
4400 | gold_assert(psymval->is_tls_symbol()); | |
4401 | // The value of a TLS symbol is the offset in the TLS segment. | |
4402 | return psymval->value(ti.object, 0); | |
4403 | } | |
9363c7c3 | 4404 | |
053a4d68 JY |
4405 | // Return the number of entries in the PLT. |
4406 | ||
4407 | template<int size, bool big_endian> | |
4408 | unsigned int | |
4409 | Target_aarch64<size, big_endian>::plt_entry_count() const | |
4410 | { | |
4411 | if (this->plt_ == NULL) | |
4412 | return 0; | |
4413 | return this->plt_->entry_count(); | |
4414 | } | |
4415 | ||
4416 | // Return the offset of the first non-reserved PLT entry. | |
4417 | ||
4418 | template<int size, bool big_endian> | |
4419 | unsigned int | |
4420 | Target_aarch64<size, big_endian>::first_plt_entry_offset() const | |
4421 | { | |
4422 | return this->plt_->first_plt_entry_offset(); | |
4423 | } | |
4424 | ||
4425 | // Return the size of each PLT entry. | |
4426 | ||
4427 | template<int size, bool big_endian> | |
4428 | unsigned int | |
4429 | Target_aarch64<size, big_endian>::plt_entry_size() const | |
4430 | { | |
4431 | return this->plt_->get_plt_entry_size(); | |
4432 | } | |
4433 | ||
3a531937 | 4434 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
053a4d68 JY |
4435 | |
4436 | template<int size, bool big_endian> | |
3a531937 JY |
4437 | void |
4438 | Target_aarch64<size, big_endian>::define_tls_base_symbol( | |
4439 | Symbol_table* symtab, Layout* layout) | |
053a4d68 | 4440 | { |
3a531937 JY |
4441 | if (this->tls_base_symbol_defined_) |
4442 | return; | |
4443 | ||
4444 | Output_segment* tls_segment = layout->tls_segment(); | |
4445 | if (tls_segment != NULL) | |
4446 | { | |
6b0ad2eb | 4447 | // _TLS_MODULE_BASE_ always points to the beginning of tls segment. |
3a531937 JY |
4448 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
4449 | Symbol_table::PREDEFINED, | |
4450 | tls_segment, 0, 0, | |
4451 | elfcpp::STT_TLS, | |
4452 | elfcpp::STB_LOCAL, | |
4453 | elfcpp::STV_HIDDEN, 0, | |
6b0ad2eb | 4454 | Symbol::SEGMENT_START, |
3a531937 JY |
4455 | true); |
4456 | } | |
4457 | this->tls_base_symbol_defined_ = true; | |
053a4d68 JY |
4458 | } |
4459 | ||
3a531937 | 4460 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
053a4d68 JY |
4461 | |
4462 | template<int size, bool big_endian> | |
3a531937 JY |
4463 | void |
4464 | Target_aarch64<size, big_endian>::reserve_tlsdesc_entries( | |
4465 | Symbol_table* symtab, Layout* layout) | |
053a4d68 | 4466 | { |
3a531937 JY |
4467 | if (this->plt_ == NULL) |
4468 | this->make_plt_section(symtab, layout); | |
4469 | ||
4470 | if (!this->plt_->has_tlsdesc_entry()) | |
053a4d68 | 4471 | { |
3a531937 JY |
4472 | // Allocate the TLSDESC_GOT entry. |
4473 | Output_data_got_aarch64<size, big_endian>* got = | |
4474 | this->got_section(symtab, layout); | |
4475 | unsigned int got_offset = got->add_constant(0); | |
4476 | ||
4477 | // Allocate the TLSDESC_PLT entry. | |
4478 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
053a4d68 | 4479 | } |
053a4d68 JY |
4480 | } |
4481 | ||
3a531937 | 4482 | // Create a GOT entry for the TLS module index. |
053a4d68 JY |
4483 | |
4484 | template<int size, bool big_endian> | |
3a531937 JY |
4485 | unsigned int |
4486 | Target_aarch64<size, big_endian>::got_mod_index_entry( | |
4487 | Symbol_table* symtab, Layout* layout, | |
4488 | Sized_relobj_file<size, big_endian>* object) | |
4489 | { | |
4490 | if (this->got_mod_index_offset_ == -1U) | |
4491 | { | |
4492 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
4493 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
4494 | Output_data_got_aarch64<size, big_endian>* got = | |
4495 | this->got_section(symtab, layout); | |
4496 | unsigned int got_offset = got->add_constant(0); | |
4497 | rela_dyn->add_local(object, 0, elfcpp::R_AARCH64_TLS_DTPMOD64, got, | |
4498 | got_offset, 0); | |
4499 | got->add_constant(0); | |
4500 | this->got_mod_index_offset_ = got_offset; | |
4501 | } | |
4502 | return this->got_mod_index_offset_; | |
4503 | } | |
4504 | ||
4505 | // Optimize the TLS relocation type based on what we know about the | |
4506 | // symbol. IS_FINAL is true if the final address of this symbol is | |
4507 | // known at link time. | |
4508 | ||
4509 | template<int size, bool big_endian> | |
4510 | tls::Tls_optimization | |
4511 | Target_aarch64<size, big_endian>::optimize_tls_reloc(bool is_final, | |
4512 | int r_type) | |
4513 | { | |
4514 | // If we are generating a shared library, then we can't do anything | |
4515 | // in the linker | |
4516 | if (parameters->options().shared()) | |
4517 | return tls::TLSOPT_NONE; | |
4518 | ||
4519 | switch (r_type) | |
4520 | { | |
4521 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: | |
4522 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
4523 | case elfcpp::R_AARCH64_TLSDESC_LD_PREL19: | |
4524 | case elfcpp::R_AARCH64_TLSDESC_ADR_PREL21: | |
4525 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
4526 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
4527 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
4528 | case elfcpp::R_AARCH64_TLSDESC_OFF_G1: | |
4529 | case elfcpp::R_AARCH64_TLSDESC_OFF_G0_NC: | |
4530 | case elfcpp::R_AARCH64_TLSDESC_LDR: | |
4531 | case elfcpp::R_AARCH64_TLSDESC_ADD: | |
4532 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
4533 | // These are General-Dynamic which permits fully general TLS | |
4534 | // access. Since we know that we are generating an executable, | |
4535 | // we can convert this to Initial-Exec. If we also know that | |
4536 | // this is a local symbol, we can further switch to Local-Exec. | |
4537 | if (is_final) | |
4538 | return tls::TLSOPT_TO_LE; | |
4539 | return tls::TLSOPT_TO_IE; | |
4540 | ||
9726c3c1 HS |
4541 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
4542 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
4543 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
4544 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
4545 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
4546 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
9726c3c1 HS |
4547 | // These are Local-Dynamic, which refer to local symbols in the |
4548 | // dynamic TLS block. Since we know that we generating an | |
4549 | // executable, we can switch to Local-Exec. | |
4550 | return tls::TLSOPT_TO_LE; | |
4551 | ||
3a531937 JY |
4552 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G1: |
4553 | case elfcpp::R_AARCH64_TLSIE_MOVW_GOTTPREL_G0_NC: | |
4554 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: | |
4555 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
4556 | case elfcpp::R_AARCH64_TLSIE_LD_GOTTPREL_PREL19: | |
4557 | // These are Initial-Exec relocs which get the thread offset | |
4558 | // from the GOT. If we know that we are linking against the | |
4559 | // local symbol, we can switch to Local-Exec, which links the | |
4560 | // thread offset into the instruction. | |
4561 | if (is_final) | |
4562 | return tls::TLSOPT_TO_LE; | |
4563 | return tls::TLSOPT_NONE; | |
4564 | ||
4565 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: | |
4566 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
4567 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
4568 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
4569 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
4570 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: | |
4571 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
4572 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
4573 | // When we already have Local-Exec, there is nothing further we | |
4574 | // can do. | |
4575 | return tls::TLSOPT_NONE; | |
4576 | ||
4577 | default: | |
4578 | gold_unreachable(); | |
4579 | } | |
4580 | } | |
4581 | ||
4582 | // Returns true if this relocation type could be that of a function pointer. | |
4583 | ||
4584 | template<int size, bool big_endian> | |
4585 | inline bool | |
4586 | Target_aarch64<size, big_endian>::Scan::possible_function_pointer_reloc( | |
4587 | unsigned int r_type) | |
4588 | { | |
4589 | switch (r_type) | |
4590 | { | |
9726c3c1 HS |
4591 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: |
4592 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: | |
4593 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: | |
4594 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
4595 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
3a531937 JY |
4596 | { |
4597 | return true; | |
4598 | } | |
4599 | } | |
4600 | return false; | |
4601 | } | |
4602 | ||
4603 | // For safe ICF, scan a relocation for a local symbol to check if it | |
4604 | // corresponds to a function pointer being taken. In that case mark | |
4605 | // the function whose pointer was taken as not foldable. | |
4606 | ||
4607 | template<int size, bool big_endian> | |
4608 | inline bool | |
4609 | Target_aarch64<size, big_endian>::Scan::local_reloc_may_be_function_pointer( | |
4610 | Symbol_table* , | |
053a4d68 JY |
4611 | Layout* , |
4612 | Target_aarch64<size, big_endian>* , | |
4613 | Sized_relobj_file<size, big_endian>* , | |
4614 | unsigned int , | |
4615 | Output_section* , | |
4616 | const elfcpp::Rela<size, big_endian>& , | |
4617 | unsigned int r_type, | |
4618 | const elfcpp::Sym<size, big_endian>&) | |
4619 | { | |
9726c3c1 | 4620 | // When building a shared library, do not fold any local symbols. |
053a4d68 | 4621 | return (parameters->options().shared() |
9363c7c3 | 4622 | || possible_function_pointer_reloc(r_type)); |
053a4d68 JY |
4623 | } |
4624 | ||
4625 | // For safe ICF, scan a relocation for a global symbol to check if it | |
4626 | // corresponds to a function pointer being taken. In that case mark | |
4627 | // the function whose pointer was taken as not foldable. | |
4628 | ||
4629 | template<int size, bool big_endian> | |
4630 | inline bool | |
4631 | Target_aarch64<size, big_endian>::Scan::global_reloc_may_be_function_pointer( | |
4632 | Symbol_table* , | |
4633 | Layout* , | |
4634 | Target_aarch64<size, big_endian>* , | |
4635 | Sized_relobj_file<size, big_endian>* , | |
4636 | unsigned int , | |
4637 | Output_section* , | |
4638 | const elfcpp::Rela<size, big_endian>& , | |
4639 | unsigned int r_type, | |
4640 | Symbol* gsym) | |
4641 | { | |
4642 | // When building a shared library, do not fold symbols whose visibility | |
4643 | // is hidden, internal or protected. | |
4644 | return ((parameters->options().shared() | |
9363c7c3 JY |
4645 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
4646 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
4647 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
4648 | || possible_function_pointer_reloc(r_type)); | |
053a4d68 JY |
4649 | } |
4650 | ||
4651 | // Report an unsupported relocation against a local symbol. | |
4652 | ||
4653 | template<int size, bool big_endian> | |
4654 | void | |
4655 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_local( | |
4656 | Sized_relobj_file<size, big_endian>* object, | |
4657 | unsigned int r_type) | |
4658 | { | |
4659 | gold_error(_("%s: unsupported reloc %u against local symbol"), | |
4660 | object->name().c_str(), r_type); | |
4661 | } | |
4662 | ||
4663 | // We are about to emit a dynamic relocation of type R_TYPE. If the | |
4664 | // dynamic linker does not support it, issue an error. | |
4665 | ||
4666 | template<int size, bool big_endian> | |
4667 | void | |
4668 | Target_aarch64<size, big_endian>::Scan::check_non_pic(Relobj* object, | |
9363c7c3 | 4669 | unsigned int r_type) |
053a4d68 JY |
4670 | { |
4671 | gold_assert(r_type != elfcpp::R_AARCH64_NONE); | |
4672 | ||
4673 | switch (r_type) | |
4674 | { | |
4675 | // These are the relocation types supported by glibc for AARCH64. | |
4676 | case elfcpp::R_AARCH64_NONE: | |
4677 | case elfcpp::R_AARCH64_COPY: | |
4678 | case elfcpp::R_AARCH64_GLOB_DAT: | |
4679 | case elfcpp::R_AARCH64_JUMP_SLOT: | |
4680 | case elfcpp::R_AARCH64_RELATIVE: | |
4681 | case elfcpp::R_AARCH64_TLS_DTPREL64: | |
4682 | case elfcpp::R_AARCH64_TLS_DTPMOD64: | |
4683 | case elfcpp::R_AARCH64_TLS_TPREL64: | |
4684 | case elfcpp::R_AARCH64_TLSDESC: | |
4685 | case elfcpp::R_AARCH64_IRELATIVE: | |
4686 | case elfcpp::R_AARCH64_ABS32: | |
4687 | case elfcpp::R_AARCH64_ABS64: | |
4688 | return; | |
4689 | ||
4690 | default: | |
4691 | break; | |
4692 | } | |
4693 | ||
4694 | // This prevents us from issuing more than one error per reloc | |
4695 | // section. But we can still wind up issuing more than one | |
4696 | // error per object file. | |
4697 | if (this->issued_non_pic_error_) | |
4698 | return; | |
4699 | gold_assert(parameters->options().output_is_position_independent()); | |
4700 | object->error(_("requires unsupported dynamic reloc; " | |
9363c7c3 | 4701 | "recompile with -fPIC")); |
053a4d68 JY |
4702 | this->issued_non_pic_error_ = true; |
4703 | return; | |
4704 | } | |
4705 | ||
9726c3c1 HS |
4706 | // Return whether we need to make a PLT entry for a relocation of the |
4707 | // given type against a STT_GNU_IFUNC symbol. | |
4708 | ||
4709 | template<int size, bool big_endian> | |
4710 | bool | |
4711 | Target_aarch64<size, big_endian>::Scan::reloc_needs_plt_for_ifunc( | |
4712 | Sized_relobj_file<size, big_endian>* object, | |
4713 | unsigned int r_type) | |
4714 | { | |
4715 | const AArch64_reloc_property* arp = | |
4716 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
4717 | gold_assert(arp != NULL); | |
4718 | ||
4719 | int flags = arp->reference_flags(); | |
4720 | if (flags & Symbol::TLS_REF) | |
4721 | { | |
4722 | gold_error(_("%s: unsupported TLS reloc %s for IFUNC symbol"), | |
4723 | object->name().c_str(), arp->name().c_str()); | |
4724 | return false; | |
4725 | } | |
4726 | return flags != 0; | |
4727 | } | |
4728 | ||
053a4d68 JY |
4729 | // Scan a relocation for a local symbol. |
4730 | ||
4731 | template<int size, bool big_endian> | |
4732 | inline void | |
4733 | Target_aarch64<size, big_endian>::Scan::local( | |
8e33481e HS |
4734 | Symbol_table* symtab, |
4735 | Layout* layout, | |
4736 | Target_aarch64<size, big_endian>* target, | |
9363c7c3 | 4737 | Sized_relobj_file<size, big_endian>* object, |
8e33481e HS |
4738 | unsigned int data_shndx, |
4739 | Output_section* output_section, | |
4740 | const elfcpp::Rela<size, big_endian>& rela, | |
053a4d68 | 4741 | unsigned int r_type, |
9726c3c1 | 4742 | const elfcpp::Sym<size, big_endian>& lsym, |
053a4d68 JY |
4743 | bool is_discarded) |
4744 | { | |
4745 | if (is_discarded) | |
4746 | return; | |
4747 | ||
8e33481e | 4748 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
3a531937 JY |
4749 | Reloc_section; |
4750 | Output_data_got_aarch64<size, big_endian>* got = | |
4751 | target->got_section(symtab, layout); | |
4752 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
8e33481e | 4753 | |
9726c3c1 HS |
4754 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
4755 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; | |
4756 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
4757 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
4758 | ||
053a4d68 JY |
4759 | switch (r_type) |
4760 | { | |
9363c7c3 JY |
4761 | case elfcpp::R_AARCH64_ABS32: |
4762 | case elfcpp::R_AARCH64_ABS16: | |
8e33481e HS |
4763 | if (parameters->options().output_is_position_independent()) |
4764 | { | |
4765 | gold_error(_("%s: unsupported reloc %u in pos independent link."), | |
4766 | object->name().c_str(), r_type); | |
4767 | } | |
4768 | break; | |
4769 | ||
4770 | case elfcpp::R_AARCH64_ABS64: | |
9363c7c3 JY |
4771 | // If building a shared library or pie, we need to mark this as a dynmic |
4772 | // reloction, so that the dynamic loader can relocate it. | |
9363c7c3 JY |
4773 | if (parameters->options().output_is_position_independent()) |
4774 | { | |
8e33481e | 4775 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8e33481e HS |
4776 | rela_dyn->add_local_relative(object, r_sym, |
4777 | elfcpp::R_AARCH64_RELATIVE, | |
4778 | output_section, | |
4779 | data_shndx, | |
4780 | rela.get_r_offset(), | |
4781 | rela.get_r_addend(), | |
9726c3c1 | 4782 | is_ifunc); |
9363c7c3 JY |
4783 | } |
4784 | break; | |
4785 | ||
8e33481e HS |
4786 | case elfcpp::R_AARCH64_PREL64: |
4787 | case elfcpp::R_AARCH64_PREL32: | |
4788 | case elfcpp::R_AARCH64_PREL16: | |
4789 | break; | |
4790 | ||
3a531937 JY |
4791 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
4792 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 | |
4793 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 | |
4794 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 | |
4795 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 | |
4796 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 | |
4797 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 | |
4798 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 | |
4799 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 | |
8e33481e | 4800 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
3a531937 | 4801 | break; |
053a4d68 | 4802 | |
8e33481e HS |
4803 | // Control flow, pc-relative. We don't need to do anything for a relative |
4804 | // addressing relocation against a local symbol if it does not reference | |
4805 | // the GOT. | |
4806 | case elfcpp::R_AARCH64_TSTBR14: | |
4807 | case elfcpp::R_AARCH64_CONDBR19: | |
4808 | case elfcpp::R_AARCH64_JUMP26: | |
4809 | case elfcpp::R_AARCH64_CALL26: | |
4810 | break; | |
4811 | ||
4812 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: | |
4813 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
4814 | { | |
3a531937 JY |
4815 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
4816 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
4817 | if (tlsopt == tls::TLSOPT_TO_LE) | |
4818 | break; | |
4819 | ||
8e33481e HS |
4820 | layout->set_has_static_tls(); |
4821 | // Create a GOT entry for the tp-relative offset. | |
8e33481e HS |
4822 | if (!parameters->doing_static_link()) |
4823 | { | |
4824 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
4825 | target->rela_dyn_section(layout), | |
4826 | elfcpp::R_AARCH64_TLS_TPREL64); | |
4827 | } | |
4828 | else if (!object->local_has_got_offset(r_sym, | |
4829 | GOT_TYPE_TLS_OFFSET)) | |
4830 | { | |
4831 | got->add_local(object, r_sym, GOT_TYPE_TLS_OFFSET); | |
4832 | unsigned int got_offset = | |
4833 | object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET); | |
4834 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
4835 | gold_assert(addend == 0); | |
4836 | got->add_static_reloc(got_offset, elfcpp::R_AARCH64_TLS_TPREL64, | |
4837 | object, r_sym); | |
4838 | } | |
4839 | } | |
4840 | break; | |
4841 | ||
3a531937 JY |
4842 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
4843 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
4844 | { | |
4845 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
4846 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
4847 | if (tlsopt == tls::TLSOPT_TO_LE) | |
4848 | { | |
4849 | layout->set_has_static_tls(); | |
4850 | break; | |
4851 | } | |
4852 | gold_assert(tlsopt == tls::TLSOPT_NONE); | |
4853 | ||
4854 | got->add_local_pair_with_rel(object,r_sym, data_shndx, | |
4855 | GOT_TYPE_TLS_PAIR, | |
4856 | target->rela_dyn_section(layout), | |
4857 | elfcpp::R_AARCH64_TLS_DTPMOD64); | |
4858 | } | |
4859 | break; | |
4860 | ||
1a920511 JY |
4861 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
4862 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
4863 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
4864 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
4865 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
4866 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
4867 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
4868 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
4869 | { | |
4870 | layout->set_has_static_tls(); | |
4871 | bool output_is_shared = parameters->options().shared(); | |
4872 | if (output_is_shared) | |
3a531937 | 4873 | gold_error(_("%s: unsupported TLSLE reloc %u in shared code."), |
8e33481e HS |
4874 | object->name().c_str(), r_type); |
4875 | } | |
9363c7c3 JY |
4876 | break; |
4877 | ||
9726c3c1 HS |
4878 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
4879 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
4880 | { | |
4881 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
4882 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
4883 | if (tlsopt == tls::TLSOPT_NONE) | |
4884 | { | |
4885 | // Create a GOT entry for the module index. | |
4886 | target->got_mod_index_entry(symtab, layout, object); | |
4887 | } | |
4888 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
4889 | unsupported_reloc_local(object, r_type); | |
4890 | } | |
4891 | break; | |
4892 | ||
4893 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
4894 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
4895 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
4896 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
9726c3c1 HS |
4897 | break; |
4898 | ||
3a531937 JY |
4899 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
4900 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
4901 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
4902 | { | |
4903 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
4904 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
4905 | target->define_tls_base_symbol(symtab, layout); | |
4906 | if (tlsopt == tls::TLSOPT_NONE) | |
4907 | { | |
4908 | // Create reserved PLT and GOT entries for the resolver. | |
4909 | target->reserve_tlsdesc_entries(symtab, layout); | |
4910 | ||
4911 | // Generate a double GOT entry with an R_AARCH64_TLSDESC reloc. | |
4912 | // The R_AARCH64_TLSDESC reloc is resolved lazily, so the GOT | |
4913 | // entry needs to be in an area in .got.plt, not .got. Call | |
4914 | // got_section to make sure the section has been created. | |
4915 | target->got_section(symtab, layout); | |
4916 | Output_data_got<size, big_endian>* got = | |
4917 | target->got_tlsdesc_section(); | |
4918 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4919 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) | |
4920 | { | |
4921 | unsigned int got_offset = got->add_constant(0); | |
4922 | got->add_constant(0); | |
4923 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
4924 | got_offset); | |
4925 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
4926 | // We store the arguments we need in a vector, and use | |
4927 | // the index into the vector as the parameter to pass | |
4928 | // to the target specific routines. | |
4929 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
4930 | void* arg = reinterpret_cast<void*>(intarg); | |
4931 | rt->add_target_specific(elfcpp::R_AARCH64_TLSDESC, arg, | |
4932 | got, got_offset, 0); | |
4933 | } | |
4934 | } | |
4935 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
4936 | unsupported_reloc_local(object, r_type); | |
4937 | } | |
4938 | break; | |
4939 | ||
4940 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
4941 | break; | |
4942 | ||
9363c7c3 JY |
4943 | default: |
4944 | unsupported_reloc_local(object, r_type); | |
053a4d68 JY |
4945 | } |
4946 | } | |
4947 | ||
4948 | ||
4949 | // Report an unsupported relocation against a global symbol. | |
4950 | ||
4951 | template<int size, bool big_endian> | |
4952 | void | |
4953 | Target_aarch64<size, big_endian>::Scan::unsupported_reloc_global( | |
4954 | Sized_relobj_file<size, big_endian>* object, | |
4955 | unsigned int r_type, | |
4956 | Symbol* gsym) | |
4957 | { | |
4958 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), | |
4959 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); | |
4960 | } | |
4961 | ||
4962 | template<int size, bool big_endian> | |
4963 | inline void | |
4964 | Target_aarch64<size, big_endian>::Scan::global( | |
9363c7c3 JY |
4965 | Symbol_table* symtab, |
4966 | Layout* layout, | |
4967 | Target_aarch64<size, big_endian>* target, | |
8e33481e HS |
4968 | Sized_relobj_file<size, big_endian> * object, |
4969 | unsigned int data_shndx, | |
4970 | Output_section* output_section, | |
4971 | const elfcpp::Rela<size, big_endian>& rela, | |
9363c7c3 JY |
4972 | unsigned int r_type, |
4973 | Symbol* gsym) | |
053a4d68 | 4974 | { |
9726c3c1 HS |
4975 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
4976 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
4977 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
4978 | target->make_plt_entry(symtab, layout, gsym); | |
4979 | ||
8e33481e HS |
4980 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian> |
4981 | Reloc_section; | |
3a531937 JY |
4982 | const AArch64_reloc_property* arp = |
4983 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
4984 | gold_assert(arp != NULL); | |
4985 | ||
9363c7c3 JY |
4986 | switch (r_type) |
4987 | { | |
8e33481e HS |
4988 | case elfcpp::R_AARCH64_ABS16: |
4989 | case elfcpp::R_AARCH64_ABS32: | |
9363c7c3 | 4990 | case elfcpp::R_AARCH64_ABS64: |
8e33481e HS |
4991 | { |
4992 | // Make a PLT entry if necessary. | |
4993 | if (gsym->needs_plt_entry()) | |
4994 | { | |
4995 | target->make_plt_entry(symtab, layout, gsym); | |
4996 | // Since this is not a PC-relative relocation, we may be | |
4997 | // taking the address of a function. In that case we need to | |
4998 | // set the entry in the dynamic symbol table to the address of | |
4999 | // the PLT entry. | |
5000 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
5001 | gsym->set_needs_dynsym_value(); | |
5002 | } | |
5003 | // Make a dynamic relocation if necessary. | |
8e33481e HS |
5004 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) |
5005 | { | |
5006 | if (!parameters->options().output_is_position_independent() | |
5007 | && gsym->may_need_copy_reloc()) | |
5008 | { | |
3a531937 JY |
5009 | target->copy_reloc(symtab, layout, object, |
5010 | data_shndx, output_section, gsym, rela); | |
8e33481e | 5011 | } |
9726c3c1 HS |
5012 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
5013 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
5014 | && gsym->can_use_relative_reloc(false) | |
5015 | && !gsym->is_from_dynobj() | |
5016 | && !gsym->is_undefined() | |
5017 | && !gsym->is_preemptible()) | |
5018 | { | |
5019 | // Use an IRELATIVE reloc for a locally defined STT_GNU_IFUNC | |
5020 | // symbol. This makes a function address in a PIE executable | |
5021 | // match the address in a shared library that it links against. | |
5022 | Reloc_section* rela_dyn = | |
5023 | target->rela_irelative_section(layout); | |
5024 | unsigned int r_type = elfcpp::R_AARCH64_IRELATIVE; | |
5025 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
5026 | output_section, object, | |
5027 | data_shndx, | |
5028 | rela.get_r_offset(), | |
5029 | rela.get_r_addend()); | |
5030 | } | |
8e33481e HS |
5031 | else if (r_type == elfcpp::R_AARCH64_ABS64 |
5032 | && gsym->can_use_relative_reloc(false)) | |
5033 | { | |
5034 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
5035 | rela_dyn->add_global_relative(gsym, | |
5036 | elfcpp::R_AARCH64_RELATIVE, | |
5037 | output_section, | |
5038 | object, | |
5039 | data_shndx, | |
5040 | rela.get_r_offset(), | |
5041 | rela.get_r_addend(), | |
5042 | false); | |
5043 | } | |
5044 | else | |
5045 | { | |
5046 | check_non_pic(object, r_type); | |
5047 | Output_data_reloc<elfcpp::SHT_RELA, true, size, big_endian>* | |
5048 | rela_dyn = target->rela_dyn_section(layout); | |
5049 | rela_dyn->add_global( | |
5050 | gsym, r_type, output_section, object, | |
5051 | data_shndx, rela.get_r_offset(),rela.get_r_addend()); | |
5052 | } | |
5053 | } | |
5054 | } | |
5055 | break; | |
5056 | ||
5057 | case elfcpp::R_AARCH64_PREL16: | |
5058 | case elfcpp::R_AARCH64_PREL32: | |
5059 | case elfcpp::R_AARCH64_PREL64: | |
9363c7c3 JY |
5060 | // This is used to fill the GOT absolute address. |
5061 | if (gsym->needs_plt_entry()) | |
5062 | { | |
5063 | target->make_plt_entry(symtab, layout, gsym); | |
5064 | } | |
5065 | break; | |
5066 | ||
3a531937 JY |
5067 | case elfcpp::R_AARCH64_LD_PREL_LO19: // 273 |
5068 | case elfcpp::R_AARCH64_ADR_PREL_LO21: // 274 | |
5069 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: // 275 | |
5070 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: // 276 | |
5071 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: // 277 | |
5072 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: // 278 | |
5073 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: // 284 | |
5074 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: // 285 | |
5075 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: // 286 | |
8e33481e | 5076 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: // 299 |
9363c7c3 | 5077 | { |
3a531937 JY |
5078 | if (gsym->needs_plt_entry()) |
5079 | target->make_plt_entry(symtab, layout, gsym); | |
5080 | // Make a dynamic relocation if necessary. | |
5081 | if (gsym->needs_dynamic_reloc(arp->reference_flags())) | |
5082 | { | |
5083 | if (parameters->options().output_is_executable() | |
5084 | && gsym->may_need_copy_reloc()) | |
5085 | { | |
5086 | target->copy_reloc(symtab, layout, object, | |
5087 | data_shndx, output_section, gsym, rela); | |
5088 | } | |
5089 | } | |
9363c7c3 JY |
5090 | break; |
5091 | } | |
5092 | ||
5093 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
5094 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
5095 | { | |
5096 | // This pair of relocations is used to access a specific GOT entry. | |
5097 | // Note a GOT entry is an *address* to a symbol. | |
5098 | // The symbol requires a GOT entry | |
5099 | Output_data_got_aarch64<size, big_endian>* got = | |
5100 | target->got_section(symtab, layout); | |
5101 | if (gsym->final_value_is_known()) | |
5102 | { | |
9726c3c1 HS |
5103 | // For a STT_GNU_IFUNC symbol we want the PLT address. |
5104 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
5105 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
5106 | else | |
5107 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
9363c7c3 JY |
5108 | } |
5109 | else | |
5110 | { | |
9726c3c1 HS |
5111 | // If this symbol is not fully resolved, we need to add a dynamic |
5112 | // relocation for it. | |
9363c7c3 | 5113 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
9726c3c1 HS |
5114 | |
5115 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
5116 | // | |
5117 | // 1) The symbol may be defined in some other module. | |
5118 | // 2) We are building a shared library and this is a protected | |
5119 | // symbol; using GLOB_DAT means that the dynamic linker can use | |
5120 | // the address of the PLT in the main executable when appropriate | |
5121 | // so that function address comparisons work. | |
5122 | // 3) This is a STT_GNU_IFUNC symbol in position dependent code, | |
5123 | // again so that function address comparisons work. | |
9363c7c3 JY |
5124 | if (gsym->is_from_dynobj() |
5125 | || gsym->is_undefined() | |
5126 | || gsym->is_preemptible() | |
5127 | || (gsym->visibility() == elfcpp::STV_PROTECTED | |
9726c3c1 HS |
5128 | && parameters->options().shared()) |
5129 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
5130 | && parameters->options().output_is_position_independent())) | |
9363c7c3 JY |
5131 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, |
5132 | rela_dyn, elfcpp::R_AARCH64_GLOB_DAT); | |
5133 | else | |
5134 | { | |
9726c3c1 HS |
5135 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
5136 | // offset into the GOT, so that function pointer | |
5137 | // comparisons work correctly. | |
5138 | bool is_new; | |
5139 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
5140 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
5141 | else | |
5142 | { | |
5143 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
5144 | // Tell the dynamic linker to use the PLT address | |
5145 | // when resolving relocations. | |
5146 | if (gsym->is_from_dynobj() | |
5147 | && !parameters->options().shared()) | |
5148 | gsym->set_needs_dynsym_value(); | |
5149 | } | |
5150 | if (is_new) | |
3a531937 JY |
5151 | { |
5152 | rela_dyn->add_global_relative( | |
5153 | gsym, elfcpp::R_AARCH64_RELATIVE, | |
5154 | got, | |
5155 | gsym->got_offset(GOT_TYPE_STANDARD), | |
5156 | 0, | |
5157 | false); | |
5158 | } | |
9363c7c3 JY |
5159 | } |
5160 | } | |
5161 | break; | |
5162 | } | |
5163 | ||
8e33481e HS |
5164 | case elfcpp::R_AARCH64_TSTBR14: |
5165 | case elfcpp::R_AARCH64_CONDBR19: | |
9363c7c3 JY |
5166 | case elfcpp::R_AARCH64_JUMP26: |
5167 | case elfcpp::R_AARCH64_CALL26: | |
5168 | { | |
5169 | if (gsym->final_value_is_known()) | |
5170 | break; | |
5171 | ||
5172 | if (gsym->is_defined() && | |
5173 | !gsym->is_from_dynobj() && | |
5174 | !gsym->is_preemptible()) | |
5175 | break; | |
5176 | ||
5177 | // Make plt entry for function call. | |
9363c7c3 JY |
5178 | target->make_plt_entry(symtab, layout, gsym); |
5179 | break; | |
5180 | } | |
5181 | ||
3a531937 JY |
5182 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
5183 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // General dynamic | |
5184 | { | |
5185 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
5186 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); | |
5187 | if (tlsopt == tls::TLSOPT_TO_LE) | |
5188 | { | |
5189 | layout->set_has_static_tls(); | |
5190 | break; | |
5191 | } | |
5192 | gold_assert(tlsopt == tls::TLSOPT_NONE); | |
5193 | ||
5194 | // General dynamic. | |
5195 | Output_data_got_aarch64<size, big_endian>* got = | |
5196 | target->got_section(symtab, layout); | |
5197 | // Create 2 consecutive entries for module index and offset. | |
5198 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
5199 | target->rela_dyn_section(layout), | |
5200 | elfcpp::R_AARCH64_TLS_DTPMOD64, | |
5201 | elfcpp::R_AARCH64_TLS_DTPREL64); | |
5202 | } | |
5203 | break; | |
5204 | ||
9726c3c1 HS |
5205 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
5206 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local dynamic | |
5207 | { | |
5208 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
5209 | optimize_tls_reloc(!parameters->options().shared(), r_type); | |
5210 | if (tlsopt == tls::TLSOPT_NONE) | |
5211 | { | |
5212 | // Create a GOT entry for the module index. | |
5213 | target->got_mod_index_entry(symtab, layout, object); | |
5214 | } | |
5215 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
5216 | unsupported_reloc_local(object, r_type); | |
5217 | } | |
5218 | break; | |
5219 | ||
5220 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
6b0ad2eb JY |
5221 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
5222 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: | |
5223 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local dynamic | |
9726c3c1 HS |
5224 | break; |
5225 | ||
8e33481e | 5226 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
3a531937 | 5227 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial executable |
8e33481e | 5228 | { |
9726c3c1 | 5229 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: |
3a531937 JY |
5230 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); |
5231 | if (tlsopt == tls::TLSOPT_TO_LE) | |
5232 | break; | |
5233 | ||
8e33481e HS |
5234 | layout->set_has_static_tls(); |
5235 | // Create a GOT entry for the tp-relative offset. | |
5236 | Output_data_got_aarch64<size, big_endian>* got | |
5237 | = target->got_section(symtab, layout); | |
5238 | if (!parameters->doing_static_link()) | |
5239 | { | |
5240 | got->add_global_with_rel( | |
5241 | gsym, GOT_TYPE_TLS_OFFSET, | |
5242 | target->rela_dyn_section(layout), | |
5243 | elfcpp::R_AARCH64_TLS_TPREL64); | |
5244 | } | |
5245 | if (!gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)) | |
5246 | { | |
5247 | got->add_global(gsym, GOT_TYPE_TLS_OFFSET); | |
5248 | unsigned int got_offset = | |
5249 | gsym->got_offset(GOT_TYPE_TLS_OFFSET); | |
5250 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
5251 | gold_assert(addend == 0); | |
5252 | got->add_static_reloc(got_offset, | |
5253 | elfcpp::R_AARCH64_TLS_TPREL64, gsym); | |
5254 | } | |
5255 | } | |
5256 | break; | |
5257 | ||
1a920511 JY |
5258 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
5259 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
5260 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
5261 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
5262 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
5263 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
5264 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
3a531937 | 5265 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: // Local executable |
8e33481e HS |
5266 | layout->set_has_static_tls(); |
5267 | if (parameters->options().shared()) | |
5268 | gold_error(_("%s: unsupported TLSLE reloc type %u in shared objects."), | |
5269 | object->name().c_str(), r_type); | |
5270 | break; | |
5271 | ||
3a531937 JY |
5272 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
5273 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
5274 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: // TLS descriptor | |
5275 | { | |
5276 | target->define_tls_base_symbol(symtab, layout); | |
5277 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
5278 | optimize_tls_reloc(gsym->final_value_is_known(), r_type); | |
5279 | if (tlsopt == tls::TLSOPT_NONE) | |
5280 | { | |
5281 | // Create reserved PLT and GOT entries for the resolver. | |
5282 | target->reserve_tlsdesc_entries(symtab, layout); | |
5283 | ||
5284 | // Create a double GOT entry with an R_AARCH64_TLSDESC | |
5285 | // relocation. The R_AARCH64_TLSDESC is resolved lazily, so the GOT | |
5286 | // entry needs to be in an area in .got.plt, not .got. Call | |
5287 | // got_section to make sure the section has been created. | |
5288 | target->got_section(symtab, layout); | |
5289 | Output_data_got<size, big_endian>* got = | |
5290 | target->got_tlsdesc_section(); | |
5291 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
5292 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, | |
5293 | elfcpp::R_AARCH64_TLSDESC, 0); | |
5294 | } | |
5295 | else if (tlsopt == tls::TLSOPT_TO_IE) | |
5296 | { | |
5297 | // Create a GOT entry for the tp-relative offset. | |
5298 | Output_data_got<size, big_endian>* got | |
5299 | = target->got_section(symtab, layout); | |
5300 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
5301 | target->rela_dyn_section(layout), | |
5302 | elfcpp::R_AARCH64_TLS_TPREL64); | |
5303 | } | |
5304 | else if (tlsopt != tls::TLSOPT_TO_LE) | |
5305 | unsupported_reloc_global(object, r_type, gsym); | |
5306 | } | |
5307 | break; | |
5308 | ||
5309 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
5310 | break; | |
5311 | ||
9363c7c3 | 5312 | default: |
8e33481e | 5313 | gold_error(_("%s: unsupported reloc type in global scan"), |
3a531937 JY |
5314 | aarch64_reloc_property_table-> |
5315 | reloc_name_in_error_message(r_type).c_str()); | |
9363c7c3 | 5316 | } |
053a4d68 | 5317 | return; |
9363c7c3 JY |
5318 | } // End of Scan::global |
5319 | ||
3a531937 | 5320 | |
9363c7c3 JY |
5321 | // Create the PLT section. |
5322 | template<int size, bool big_endian> | |
5323 | void | |
5324 | Target_aarch64<size, big_endian>::make_plt_section( | |
5325 | Symbol_table* symtab, Layout* layout) | |
5326 | { | |
5327 | if (this->plt_ == NULL) | |
5328 | { | |
5329 | // Create the GOT section first. | |
5330 | this->got_section(symtab, layout); | |
5331 | ||
3a531937 JY |
5332 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
5333 | this->got_irelative_); | |
9363c7c3 JY |
5334 | |
5335 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
5336 | (elfcpp::SHF_ALLOC | |
5337 | | elfcpp::SHF_EXECINSTR), | |
5338 | this->plt_, ORDER_PLT, false); | |
5339 | ||
5340 | // Make the sh_info field of .rela.plt point to .plt. | |
5341 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
5342 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
5343 | } | |
5344 | } | |
5345 | ||
3a531937 JY |
5346 | // Return the section for TLSDESC relocations. |
5347 | ||
5348 | template<int size, bool big_endian> | |
5349 | typename Target_aarch64<size, big_endian>::Reloc_section* | |
5350 | Target_aarch64<size, big_endian>::rela_tlsdesc_section(Layout* layout) const | |
5351 | { | |
5352 | return this->plt_section()->rela_tlsdesc(layout); | |
5353 | } | |
5354 | ||
9363c7c3 JY |
5355 | // Create a PLT entry for a global symbol. |
5356 | ||
5357 | template<int size, bool big_endian> | |
5358 | void | |
5359 | Target_aarch64<size, big_endian>::make_plt_entry( | |
5360 | Symbol_table* symtab, | |
5361 | Layout* layout, | |
5362 | Symbol* gsym) | |
5363 | { | |
5364 | if (gsym->has_plt_offset()) | |
5365 | return; | |
5366 | ||
5367 | if (this->plt_ == NULL) | |
5368 | this->make_plt_section(symtab, layout); | |
5369 | ||
9726c3c1 HS |
5370 | this->plt_->add_entry(symtab, layout, gsym); |
5371 | } | |
5372 | ||
5373 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. | |
5374 | ||
5375 | template<int size, bool big_endian> | |
5376 | void | |
5377 | Target_aarch64<size, big_endian>::make_local_ifunc_plt_entry( | |
5378 | Symbol_table* symtab, Layout* layout, | |
5379 | Sized_relobj_file<size, big_endian>* relobj, | |
5380 | unsigned int local_sym_index) | |
5381 | { | |
5382 | if (relobj->local_has_plt_offset(local_sym_index)) | |
5383 | return; | |
5384 | if (this->plt_ == NULL) | |
5385 | this->make_plt_section(symtab, layout); | |
5386 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, | |
5387 | relobj, | |
5388 | local_sym_index); | |
5389 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
053a4d68 JY |
5390 | } |
5391 | ||
5392 | template<int size, bool big_endian> | |
5393 | void | |
5394 | Target_aarch64<size, big_endian>::gc_process_relocs( | |
5395 | Symbol_table* symtab, | |
5396 | Layout* layout, | |
5397 | Sized_relobj_file<size, big_endian>* object, | |
5398 | unsigned int data_shndx, | |
5399 | unsigned int sh_type, | |
5400 | const unsigned char* prelocs, | |
5401 | size_t reloc_count, | |
5402 | Output_section* output_section, | |
5403 | bool needs_special_offset_handling, | |
5404 | size_t local_symbol_count, | |
5405 | const unsigned char* plocal_symbols) | |
5406 | { | |
5407 | if (sh_type == elfcpp::SHT_REL) | |
5408 | { | |
5409 | return; | |
5410 | } | |
5411 | ||
9363c7c3 JY |
5412 | gold::gc_process_relocs< |
5413 | size, big_endian, | |
5414 | Target_aarch64<size, big_endian>, | |
5415 | elfcpp::SHT_RELA, | |
5416 | typename Target_aarch64<size, big_endian>::Scan, | |
5417 | typename Target_aarch64<size, big_endian>::Relocatable_size_for_reloc>( | |
053a4d68 JY |
5418 | symtab, |
5419 | layout, | |
5420 | this, | |
5421 | object, | |
5422 | data_shndx, | |
5423 | prelocs, | |
5424 | reloc_count, | |
5425 | output_section, | |
5426 | needs_special_offset_handling, | |
5427 | local_symbol_count, | |
5428 | plocal_symbols); | |
5429 | } | |
5430 | ||
5431 | // Scan relocations for a section. | |
5432 | ||
5433 | template<int size, bool big_endian> | |
5434 | void | |
5435 | Target_aarch64<size, big_endian>::scan_relocs( | |
5436 | Symbol_table* symtab, | |
5437 | Layout* layout, | |
5438 | Sized_relobj_file<size, big_endian>* object, | |
5439 | unsigned int data_shndx, | |
5440 | unsigned int sh_type, | |
5441 | const unsigned char* prelocs, | |
5442 | size_t reloc_count, | |
5443 | Output_section* output_section, | |
5444 | bool needs_special_offset_handling, | |
5445 | size_t local_symbol_count, | |
5446 | const unsigned char* plocal_symbols) | |
5447 | { | |
5448 | if (sh_type == elfcpp::SHT_REL) | |
5449 | { | |
5450 | gold_error(_("%s: unsupported REL reloc section"), | |
5451 | object->name().c_str()); | |
5452 | return; | |
5453 | } | |
9363c7c3 | 5454 | gold::scan_relocs<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, Scan>( |
053a4d68 JY |
5455 | symtab, |
5456 | layout, | |
5457 | this, | |
5458 | object, | |
5459 | data_shndx, | |
5460 | prelocs, | |
5461 | reloc_count, | |
5462 | output_section, | |
5463 | needs_special_offset_handling, | |
5464 | local_symbol_count, | |
5465 | plocal_symbols); | |
5466 | } | |
5467 | ||
3a531937 JY |
5468 | // Return the value to use for a dynamic which requires special |
5469 | // treatment. This is how we support equality comparisons of function | |
5470 | // pointers across shared library boundaries, as described in the | |
5471 | // processor specific ABI supplement. | |
5472 | ||
83a01957 | 5473 | template<int size, bool big_endian> |
3a531937 | 5474 | uint64_t |
83a01957 | 5475 | Target_aarch64<size, big_endian>::do_dynsym_value(const Symbol* gsym) const |
3a531937 JY |
5476 | { |
5477 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
5478 | return this->plt_address_for_global(gsym); | |
5479 | } | |
5480 | ||
83a01957 | 5481 | |
053a4d68 JY |
5482 | // Finalize the sections. |
5483 | ||
5484 | template<int size, bool big_endian> | |
5485 | void | |
5486 | Target_aarch64<size, big_endian>::do_finalize_sections( | |
9363c7c3 | 5487 | Layout* layout, |
053a4d68 | 5488 | const Input_objects*, |
9363c7c3 | 5489 | Symbol_table* symtab) |
053a4d68 | 5490 | { |
9363c7c3 JY |
5491 | const Reloc_section* rel_plt = (this->plt_ == NULL |
5492 | ? NULL | |
5493 | : this->plt_->rela_plt()); | |
5494 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, | |
5495 | this->rela_dyn_, true, false); | |
5496 | ||
3a531937 JY |
5497 | // Emit any relocs we saved in an attempt to avoid generating COPY |
5498 | // relocs. | |
5499 | if (this->copy_relocs_.any_saved_relocs()) | |
5500 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
5501 | ||
5502 | // Fill in some more dynamic tags. | |
5503 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
5504 | if (odyn != NULL) | |
5505 | { | |
5506 | if (this->plt_ != NULL | |
5507 | && this->plt_->output_section() != NULL | |
5508 | && this->plt_ ->has_tlsdesc_entry()) | |
5509 | { | |
5510 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
5511 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
5512 | this->got_->finalize_data_size(); | |
5513 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
5514 | this->plt_, plt_offset); | |
5515 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
5516 | this->got_, got_offset); | |
5517 | } | |
5518 | } | |
5519 | ||
9363c7c3 JY |
5520 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of |
5521 | // the .got.plt section. | |
5522 | Symbol* sym = this->global_offset_table_; | |
5523 | if (sym != NULL) | |
5524 | { | |
5525 | uint64_t data_size = this->got_plt_->current_data_size(); | |
5526 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); | |
5527 | ||
5528 | // If the .got section is more than 0x8000 bytes, we add | |
5529 | // 0x8000 to the value of _GLOBAL_OFFSET_TABLE_, so that 16 | |
5530 | // bit relocations have a greater chance of working. | |
5531 | if (data_size >= 0x8000) | |
5532 | symtab->get_sized_symbol<size>(sym)->set_value( | |
5533 | symtab->get_sized_symbol<size>(sym)->value() + 0x8000); | |
5534 | } | |
5535 | ||
5536 | if (parameters->doing_static_link() | |
5537 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
5538 | { | |
5539 | // If linking statically, make sure that the __rela_iplt symbols | |
5540 | // were defined if necessary, even if we didn't create a PLT. | |
5541 | static const Define_symbol_in_segment syms[] = | |
5542 | { | |
5543 | { | |
5544 | "__rela_iplt_start", // name | |
5545 | elfcpp::PT_LOAD, // segment_type | |
5546 | elfcpp::PF_W, // segment_flags_set | |
5547 | elfcpp::PF(0), // segment_flags_clear | |
5548 | 0, // value | |
5549 | 0, // size | |
5550 | elfcpp::STT_NOTYPE, // type | |
5551 | elfcpp::STB_GLOBAL, // binding | |
5552 | elfcpp::STV_HIDDEN, // visibility | |
5553 | 0, // nonvis | |
5554 | Symbol::SEGMENT_START, // offset_from_base | |
5555 | true // only_if_ref | |
5556 | }, | |
5557 | { | |
5558 | "__rela_iplt_end", // name | |
5559 | elfcpp::PT_LOAD, // segment_type | |
5560 | elfcpp::PF_W, // segment_flags_set | |
5561 | elfcpp::PF(0), // segment_flags_clear | |
5562 | 0, // value | |
5563 | 0, // size | |
5564 | elfcpp::STT_NOTYPE, // type | |
5565 | elfcpp::STB_GLOBAL, // binding | |
5566 | elfcpp::STV_HIDDEN, // visibility | |
5567 | 0, // nonvis | |
5568 | Symbol::SEGMENT_START, // offset_from_base | |
5569 | true // only_if_ref | |
5570 | } | |
5571 | }; | |
5572 | ||
5573 | symtab->define_symbols(layout, 2, syms, | |
5574 | layout->script_options()->saw_sections_clause()); | |
5575 | } | |
5576 | ||
053a4d68 JY |
5577 | return; |
5578 | } | |
5579 | ||
5580 | // Perform a relocation. | |
5581 | ||
5582 | template<int size, bool big_endian> | |
5583 | inline bool | |
5584 | Target_aarch64<size, big_endian>::Relocate::relocate( | |
9363c7c3 JY |
5585 | const Relocate_info<size, big_endian>* relinfo, |
5586 | Target_aarch64<size, big_endian>* target, | |
053a4d68 | 5587 | Output_section* , |
9363c7c3 JY |
5588 | size_t relnum, |
5589 | const elfcpp::Rela<size, big_endian>& rela, | |
5590 | unsigned int r_type, | |
5591 | const Sized_symbol<size>* gsym, | |
5592 | const Symbol_value<size>* psymval, | |
5593 | unsigned char* view, | |
5594 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
053a4d68 JY |
5595 | section_size_type /* view_size */) |
5596 | { | |
9363c7c3 JY |
5597 | if (view == NULL) |
5598 | return true; | |
5599 | ||
5600 | typedef AArch64_relocate_functions<size, big_endian> Reloc; | |
5601 | ||
5602 | const AArch64_reloc_property* reloc_property = | |
5603 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
5604 | ||
5605 | if (reloc_property == NULL) | |
5606 | { | |
5607 | std::string reloc_name = | |
5608 | aarch64_reloc_property_table->reloc_name_in_error_message(r_type); | |
5609 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
5610 | _("cannot relocate %s in object file"), | |
5611 | reloc_name.c_str()); | |
5612 | return true; | |
5613 | } | |
5614 | ||
5615 | const Sized_relobj_file<size, big_endian>* object = relinfo->object; | |
5616 | ||
5617 | // Pick the value to use for symbols defined in the PLT. | |
5618 | Symbol_value<size> symval; | |
5619 | if (gsym != NULL | |
5620 | && gsym->use_plt_offset(reloc_property->reference_flags())) | |
5621 | { | |
5622 | symval.set_output_value(target->plt_address_for_global(gsym)); | |
5623 | psymval = &symval; | |
5624 | } | |
5625 | else if (gsym == NULL && psymval->is_ifunc_symbol()) | |
5626 | { | |
5627 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
5628 | if (object->local_has_plt_offset(r_sym)) | |
5629 | { | |
5630 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); | |
5631 | psymval = &symval; | |
5632 | } | |
5633 | } | |
5634 | ||
5635 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
5636 | ||
5637 | // Get the GOT offset if needed. | |
5638 | // For aarch64, the GOT pointer points to the start of the GOT section. | |
5639 | bool have_got_offset = false; | |
5640 | int got_offset = 0; | |
5641 | int got_base = (target->got_ != NULL | |
5642 | ? (target->got_->current_data_size() >= 0x8000 | |
5643 | ? 0x8000 : 0) | |
5644 | : 0); | |
5645 | switch (r_type) | |
5646 | { | |
5647 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0: | |
5648 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G0_NC: | |
5649 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1: | |
5650 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G1_NC: | |
5651 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2: | |
5652 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G2_NC: | |
5653 | case elfcpp::R_AARCH64_MOVW_GOTOFF_G3: | |
5654 | case elfcpp::R_AARCH64_GOTREL64: | |
5655 | case elfcpp::R_AARCH64_GOTREL32: | |
5656 | case elfcpp::R_AARCH64_GOT_LD_PREL19: | |
5657 | case elfcpp::R_AARCH64_LD64_GOTOFF_LO15: | |
5658 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
5659 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
5660 | case elfcpp::R_AARCH64_LD64_GOTPAGE_LO15: | |
5661 | if (gsym != NULL) | |
5662 | { | |
5663 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
5664 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - got_base; | |
5665 | } | |
5666 | else | |
5667 | { | |
5668 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
5669 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
5670 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
5671 | - got_base); | |
5672 | } | |
5673 | have_got_offset = true; | |
5674 | break; | |
8e33481e | 5675 | |
9363c7c3 JY |
5676 | default: |
5677 | break; | |
5678 | } | |
5679 | ||
5680 | typename Reloc::Status reloc_status = Reloc::STATUS_OKAY; | |
5681 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
5682 | switch (r_type) | |
5683 | { | |
5684 | case elfcpp::R_AARCH64_NONE: | |
5685 | break; | |
5686 | ||
5687 | case elfcpp::R_AARCH64_ABS64: | |
5688 | reloc_status = Reloc::template rela_ua<64>( | |
5689 | view, object, psymval, addend, reloc_property); | |
5690 | break; | |
5691 | ||
5692 | case elfcpp::R_AARCH64_ABS32: | |
5693 | reloc_status = Reloc::template rela_ua<32>( | |
5694 | view, object, psymval, addend, reloc_property); | |
5695 | break; | |
5696 | ||
5697 | case elfcpp::R_AARCH64_ABS16: | |
5698 | reloc_status = Reloc::template rela_ua<16>( | |
5699 | view, object, psymval, addend, reloc_property); | |
5700 | break; | |
5701 | ||
5702 | case elfcpp::R_AARCH64_PREL64: | |
5703 | reloc_status = Reloc::template pcrela_ua<64>( | |
5704 | view, object, psymval, addend, address, reloc_property); | |
83a01957 | 5705 | break; |
9363c7c3 JY |
5706 | |
5707 | case elfcpp::R_AARCH64_PREL32: | |
5708 | reloc_status = Reloc::template pcrela_ua<32>( | |
5709 | view, object, psymval, addend, address, reloc_property); | |
83a01957 | 5710 | break; |
9363c7c3 JY |
5711 | |
5712 | case elfcpp::R_AARCH64_PREL16: | |
5713 | reloc_status = Reloc::template pcrela_ua<16>( | |
5714 | view, object, psymval, addend, address, reloc_property); | |
83a01957 | 5715 | break; |
9363c7c3 | 5716 | |
9726c3c1 HS |
5717 | case elfcpp::R_AARCH64_LD_PREL_LO19: |
5718 | reloc_status = Reloc::template pcrela_general<32>( | |
5719 | view, object, psymval, addend, address, reloc_property); | |
5720 | break; | |
5721 | ||
5722 | case elfcpp::R_AARCH64_ADR_PREL_LO21: | |
5723 | reloc_status = Reloc::adr(view, object, psymval, addend, | |
5724 | address, reloc_property); | |
5725 | break; | |
5726 | ||
9363c7c3 JY |
5727 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21_NC: |
5728 | case elfcpp::R_AARCH64_ADR_PREL_PG_HI21: | |
5729 | reloc_status = Reloc::adrp(view, object, psymval, addend, address, | |
5730 | reloc_property); | |
5731 | break; | |
5732 | ||
5733 | case elfcpp::R_AARCH64_LDST8_ABS_LO12_NC: | |
5734 | case elfcpp::R_AARCH64_LDST16_ABS_LO12_NC: | |
5735 | case elfcpp::R_AARCH64_LDST32_ABS_LO12_NC: | |
5736 | case elfcpp::R_AARCH64_LDST64_ABS_LO12_NC: | |
5737 | case elfcpp::R_AARCH64_LDST128_ABS_LO12_NC: | |
5738 | case elfcpp::R_AARCH64_ADD_ABS_LO12_NC: | |
5739 | reloc_status = Reloc::template rela_general<32>( | |
5740 | view, object, psymval, addend, reloc_property); | |
5741 | break; | |
5742 | ||
3a531937 JY |
5743 | case elfcpp::R_AARCH64_CALL26: |
5744 | if (this->skip_call_tls_get_addr_) | |
5745 | { | |
5746 | // Double check that the TLSGD insn has been optimized away. | |
5747 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
5748 | Insntype insn = elfcpp::Swap<32, big_endian>::readval( | |
5749 | reinterpret_cast<Insntype*>(view)); | |
5750 | gold_assert((insn & 0xff000000) == 0x91000000); | |
5751 | ||
5752 | reloc_status = Reloc::STATUS_OKAY; | |
5753 | this->skip_call_tls_get_addr_ = false; | |
5754 | // Return false to stop further processing this reloc. | |
5755 | return false; | |
5756 | } | |
83a01957 HS |
5757 | // Fallthrough |
5758 | case elfcpp::R_AARCH64_JUMP26: | |
5759 | if (Reloc::maybe_apply_stub(r_type, relinfo, rela, view, address, | |
0bf32ea9 JY |
5760 | gsym, psymval, object, |
5761 | target->stub_group_size_)) | |
83a01957 HS |
5762 | break; |
5763 | // Fallthrough | |
8e33481e HS |
5764 | case elfcpp::R_AARCH64_TSTBR14: |
5765 | case elfcpp::R_AARCH64_CONDBR19: | |
9363c7c3 JY |
5766 | reloc_status = Reloc::template pcrela_general<32>( |
5767 | view, object, psymval, addend, address, reloc_property); | |
5768 | break; | |
5769 | ||
5770 | case elfcpp::R_AARCH64_ADR_GOT_PAGE: | |
5771 | gold_assert(have_got_offset); | |
5772 | value = target->got_->address() + got_base + got_offset; | |
5773 | reloc_status = Reloc::adrp(view, value + addend, address); | |
5774 | break; | |
5775 | ||
5776 | case elfcpp::R_AARCH64_LD64_GOT_LO12_NC: | |
5777 | gold_assert(have_got_offset); | |
5778 | value = target->got_->address() + got_base + got_offset; | |
5779 | reloc_status = Reloc::template rela_general<32>( | |
5780 | view, value, addend, reloc_property); | |
5781 | break; | |
5782 | ||
3a531937 JY |
5783 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
5784 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
9726c3c1 HS |
5785 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
5786 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
5787 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
5788 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
5789 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
5790 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
8e33481e HS |
5791 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
5792 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
1a920511 JY |
5793 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
5794 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
5795 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
5796 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
5797 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
5798 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
5799 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
5800 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
3a531937 JY |
5801 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
5802 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
5803 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
5804 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
8e33481e HS |
5805 | reloc_status = relocate_tls(relinfo, target, relnum, rela, r_type, |
5806 | gsym, psymval, view, address); | |
5807 | break; | |
5808 | ||
3a531937 JY |
5809 | // These are dynamic relocations, which are unexpected when linking. |
5810 | case elfcpp::R_AARCH64_COPY: | |
5811 | case elfcpp::R_AARCH64_GLOB_DAT: | |
5812 | case elfcpp::R_AARCH64_JUMP_SLOT: | |
5813 | case elfcpp::R_AARCH64_RELATIVE: | |
5814 | case elfcpp::R_AARCH64_IRELATIVE: | |
5815 | case elfcpp::R_AARCH64_TLS_DTPREL64: | |
5816 | case elfcpp::R_AARCH64_TLS_DTPMOD64: | |
5817 | case elfcpp::R_AARCH64_TLS_TPREL64: | |
5818 | case elfcpp::R_AARCH64_TLSDESC: | |
9363c7c3 | 5819 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3a531937 | 5820 | _("unexpected reloc %u in object file"), |
9363c7c3 JY |
5821 | r_type); |
5822 | break; | |
3a531937 JY |
5823 | |
5824 | default: | |
5825 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
5826 | _("unsupported reloc %s"), | |
5827 | reloc_property->name().c_str()); | |
5828 | break; | |
9363c7c3 JY |
5829 | } |
5830 | ||
5831 | // Report any errors. | |
5832 | switch (reloc_status) | |
5833 | { | |
5834 | case Reloc::STATUS_OKAY: | |
5835 | break; | |
5836 | case Reloc::STATUS_OVERFLOW: | |
5837 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
5838 | _("relocation overflow in %s"), | |
5839 | reloc_property->name().c_str()); | |
5840 | break; | |
5841 | case Reloc::STATUS_BAD_RELOC: | |
5842 | gold_error_at_location( | |
5843 | relinfo, | |
5844 | relnum, | |
5845 | rela.get_r_offset(), | |
5846 | _("unexpected opcode while processing relocation %s"), | |
5847 | reloc_property->name().c_str()); | |
5848 | break; | |
5849 | default: | |
5850 | gold_unreachable(); | |
5851 | } | |
5852 | ||
053a4d68 JY |
5853 | return true; |
5854 | } | |
5855 | ||
3a531937 | 5856 | |
8e33481e HS |
5857 | template<int size, bool big_endian> |
5858 | inline | |
83a01957 | 5859 | typename AArch64_relocate_functions<size, big_endian>::Status |
8e33481e | 5860 | Target_aarch64<size, big_endian>::Relocate::relocate_tls( |
83a01957 | 5861 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
5862 | Target_aarch64<size, big_endian>* target, |
5863 | size_t relnum, | |
5864 | const elfcpp::Rela<size, big_endian>& rela, | |
5865 | unsigned int r_type, const Sized_symbol<size>* gsym, | |
5866 | const Symbol_value<size>* psymval, | |
5867 | unsigned char* view, | |
8e33481e HS |
5868 | typename elfcpp::Elf_types<size>::Elf_Addr address) |
5869 | { | |
83a01957 | 5870 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 | 5871 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; |
8e33481e | 5872 | |
3a531937 JY |
5873 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
5874 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
5875 | const AArch64_reloc_property* reloc_property = | |
5876 | aarch64_reloc_property_table->get_reloc_property(r_type); | |
8e33481e HS |
5877 | gold_assert(reloc_property != NULL); |
5878 | ||
3a531937 JY |
5879 | const bool is_final = (gsym == NULL |
5880 | ? !parameters->options().shared() | |
5881 | : gsym->final_value_is_known()); | |
5882 | tls::Tls_optimization tlsopt = Target_aarch64<size, big_endian>:: | |
5883 | optimize_tls_reloc(is_final, r_type); | |
5884 | ||
83a01957 | 5885 | Sized_relobj_file<size, big_endian>* object = relinfo->object; |
3a531937 | 5886 | int tls_got_offset_type; |
8e33481e HS |
5887 | switch (r_type) |
5888 | { | |
3a531937 JY |
5889 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: |
5890 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: // Global-dynamic | |
5891 | { | |
5892 | if (tlsopt == tls::TLSOPT_TO_LE) | |
5893 | { | |
5894 | if (tls_segment == NULL) | |
5895 | { | |
5896 | gold_assert(parameters->errors()->error_count() > 0 | |
5897 | || issue_undefined_symbol_error(gsym)); | |
5898 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
5899 | } | |
5900 | return tls_gd_to_le(relinfo, target, rela, r_type, view, | |
5901 | psymval); | |
5902 | } | |
5903 | else if (tlsopt == tls::TLSOPT_NONE) | |
5904 | { | |
5905 | tls_got_offset_type = GOT_TYPE_TLS_PAIR; | |
5906 | // Firstly get the address for the got entry. | |
5907 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; | |
5908 | if (gsym != NULL) | |
5909 | { | |
5910 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); | |
5911 | got_entry_address = target->got_->address() + | |
5912 | gsym->got_offset(tls_got_offset_type); | |
5913 | } | |
5914 | else | |
5915 | { | |
5916 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
5917 | gold_assert( | |
5918 | object->local_has_got_offset(r_sym, tls_got_offset_type)); | |
5919 | got_entry_address = target->got_->address() + | |
5920 | object->local_got_offset(r_sym, tls_got_offset_type); | |
5921 | } | |
5922 | ||
5923 | // Relocate the address into adrp/ld, adrp/add pair. | |
5924 | switch (r_type) | |
5925 | { | |
5926 | case elfcpp::R_AARCH64_TLSGD_ADR_PAGE21: | |
5927 | return aarch64_reloc_funcs::adrp( | |
5928 | view, got_entry_address + addend, address); | |
5929 | ||
5930 | break; | |
5931 | ||
5932 | case elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC: | |
5933 | return aarch64_reloc_funcs::template rela_general<32>( | |
5934 | view, got_entry_address, addend, reloc_property); | |
5935 | break; | |
5936 | ||
5937 | default: | |
9726c3c1 | 5938 | gold_unreachable(); |
3a531937 JY |
5939 | } |
5940 | } | |
5941 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
5942 | _("unsupported gd_to_ie relaxation on %u"), | |
5943 | r_type); | |
5944 | } | |
5945 | break; | |
5946 | ||
9726c3c1 HS |
5947 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: |
5948 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: // Local-dynamic | |
5949 | { | |
5950 | if (tlsopt == tls::TLSOPT_TO_LE) | |
5951 | { | |
5952 | if (tls_segment == NULL) | |
5953 | { | |
5954 | gold_assert(parameters->errors()->error_count() > 0 | |
5955 | || issue_undefined_symbol_error(gsym)); | |
5956 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
5957 | } | |
5958 | return this->tls_ld_to_le(relinfo, target, rela, r_type, view, | |
5959 | psymval); | |
5960 | } | |
5961 | ||
5962 | gold_assert(tlsopt == tls::TLSOPT_NONE); | |
5963 | // Relocate the field with the offset of the GOT entry for | |
5964 | // the module index. | |
5965 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; | |
5966 | got_entry_address = (target->got_mod_index_entry(NULL, NULL, NULL) + | |
5967 | target->got_->address()); | |
5968 | ||
5969 | switch (r_type) | |
5970 | { | |
5971 | case elfcpp::R_AARCH64_TLSLD_ADR_PAGE21: | |
5972 | return aarch64_reloc_funcs::adrp( | |
5973 | view, got_entry_address + addend, address); | |
5974 | break; | |
5975 | ||
5976 | case elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC: | |
5977 | return aarch64_reloc_funcs::template rela_general<32>( | |
5978 | view, got_entry_address, addend, reloc_property); | |
5979 | break; | |
5980 | ||
5981 | default: | |
5982 | gold_unreachable(); | |
5983 | } | |
5984 | } | |
5985 | break; | |
5986 | ||
5987 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
6b0ad2eb JY |
5988 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: |
5989 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: | |
5990 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: // Other local-dynamic | |
9726c3c1 HS |
5991 | { |
5992 | AArch64_address value = psymval->value(object, 0); | |
5993 | if (tlsopt == tls::TLSOPT_TO_LE) | |
5994 | { | |
5995 | if (tls_segment == NULL) | |
5996 | { | |
5997 | gold_assert(parameters->errors()->error_count() > 0 | |
5998 | || issue_undefined_symbol_error(gsym)); | |
5999 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6000 | } | |
9726c3c1 HS |
6001 | } |
6002 | switch (r_type) | |
6003 | { | |
6004 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G1: | |
6005 | return aarch64_reloc_funcs::movnz(view, value + addend, | |
6006 | reloc_property); | |
6007 | break; | |
6008 | ||
6009 | case elfcpp::R_AARCH64_TLSLD_MOVW_DTPREL_G0_NC: | |
6b0ad2eb JY |
6010 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_HI12: |
6011 | case elfcpp::R_AARCH64_TLSLD_ADD_DTPREL_LO12_NC: | |
9726c3c1 HS |
6012 | return aarch64_reloc_funcs::template rela_general<32>( |
6013 | view, value, addend, reloc_property); | |
6014 | break; | |
6015 | ||
6016 | default: | |
6017 | gold_unreachable(); | |
6018 | } | |
6019 | // We should never reach here. | |
6020 | } | |
6021 | break; | |
6022 | ||
8e33481e | 6023 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
3a531937 | 6024 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: // Initial-exec |
8e33481e | 6025 | { |
3a531937 JY |
6026 | if (tlsopt == tls::TLSOPT_TO_LE) |
6027 | { | |
6028 | if (tls_segment == NULL) | |
6029 | { | |
6030 | gold_assert(parameters->errors()->error_count() > 0 | |
6031 | || issue_undefined_symbol_error(gsym)); | |
6032 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6033 | } | |
6034 | return tls_ie_to_le(relinfo, target, rela, r_type, view, | |
6035 | psymval); | |
6036 | } | |
6037 | tls_got_offset_type = GOT_TYPE_TLS_OFFSET; | |
6038 | ||
6039 | // Firstly get the address for the got entry. | |
8e33481e HS |
6040 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; |
6041 | if (gsym != NULL) | |
6042 | { | |
3a531937 | 6043 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); |
8e33481e | 6044 | got_entry_address = target->got_->address() + |
3a531937 | 6045 | gsym->got_offset(tls_got_offset_type); |
8e33481e HS |
6046 | } |
6047 | else | |
6048 | { | |
6049 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
6050 | gold_assert( | |
3a531937 | 6051 | object->local_has_got_offset(r_sym, tls_got_offset_type)); |
8e33481e | 6052 | got_entry_address = target->got_->address() + |
3a531937 | 6053 | object->local_got_offset(r_sym, tls_got_offset_type); |
8e33481e | 6054 | } |
3a531937 JY |
6055 | // Relocate the address into adrp/ld, adrp/add pair. |
6056 | switch (r_type) | |
8e33481e | 6057 | { |
3a531937 JY |
6058 | case elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21: |
6059 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, | |
6060 | address); | |
6061 | break; | |
6062 | case elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC: | |
6063 | return aarch64_reloc_funcs::template rela_general<32>( | |
6064 | view, got_entry_address, addend, reloc_property); | |
6065 | default: | |
9726c3c1 | 6066 | gold_unreachable(); |
8e33481e | 6067 | } |
8e33481e | 6068 | } |
3a531937 | 6069 | // We shall never reach here. |
8e33481e HS |
6070 | break; |
6071 | ||
1a920511 JY |
6072 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: |
6073 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
6074 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1_NC: | |
6075 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
6076 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0_NC: | |
8e33481e HS |
6077 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12: |
6078 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12: | |
6079 | case elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12_NC: | |
6080 | { | |
8e33481e | 6081 | gold_assert(tls_segment != NULL); |
3a531937 | 6082 | AArch64_address value = psymval->value(object, 0); |
8e33481e HS |
6083 | |
6084 | if (!parameters->options().shared()) | |
6085 | { | |
3a531937 JY |
6086 | AArch64_address aligned_tcb_size = |
6087 | align_address(target->tcb_size(), | |
6088 | tls_segment->maximum_alignment()); | |
1a920511 JY |
6089 | value += aligned_tcb_size; |
6090 | switch (r_type) | |
6091 | { | |
6092 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G2: | |
6093 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G1: | |
6094 | case elfcpp::R_AARCH64_TLSLE_MOVW_TPREL_G0: | |
6095 | return aarch64_reloc_funcs::movnz(view, value + addend, | |
6096 | reloc_property); | |
6097 | default: | |
6098 | return aarch64_reloc_funcs::template | |
6099 | rela_general<32>(view, | |
6100 | value, | |
6101 | addend, | |
6102 | reloc_property); | |
6103 | } | |
8e33481e HS |
6104 | } |
6105 | else | |
6106 | gold_error(_("%s: unsupported reloc %u " | |
6107 | "in non-static TLSLE mode."), | |
6108 | object->name().c_str(), r_type); | |
6109 | } | |
6110 | break; | |
6111 | ||
3a531937 JY |
6112 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: |
6113 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
6114 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
6115 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
6116 | { | |
6117 | if (tlsopt == tls::TLSOPT_TO_LE) | |
6118 | { | |
6119 | if (tls_segment == NULL) | |
6120 | { | |
6121 | gold_assert(parameters->errors()->error_count() > 0 | |
6122 | || issue_undefined_symbol_error(gsym)); | |
6123 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6124 | } | |
6125 | return tls_desc_gd_to_le(relinfo, target, rela, r_type, | |
6126 | view, psymval); | |
6127 | } | |
6128 | else | |
6129 | { | |
6130 | tls_got_offset_type = (tlsopt == tls::TLSOPT_TO_IE | |
6131 | ? GOT_TYPE_TLS_OFFSET | |
6132 | : GOT_TYPE_TLS_DESC); | |
6133 | unsigned int got_tlsdesc_offset = 0; | |
6134 | if (r_type != elfcpp::R_AARCH64_TLSDESC_CALL | |
6135 | && tlsopt == tls::TLSOPT_NONE) | |
6136 | { | |
6137 | // We created GOT entries in the .got.tlsdesc portion of the | |
6138 | // .got.plt section, but the offset stored in the symbol is the | |
6139 | // offset within .got.tlsdesc. | |
6140 | got_tlsdesc_offset = (target->got_->data_size() | |
6141 | + target->got_plt_section()->data_size()); | |
6142 | } | |
6143 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address; | |
6144 | if (gsym != NULL) | |
6145 | { | |
6146 | gold_assert(gsym->has_got_offset(tls_got_offset_type)); | |
6147 | got_entry_address = target->got_->address() | |
6148 | + got_tlsdesc_offset | |
6149 | + gsym->got_offset(tls_got_offset_type); | |
6150 | } | |
6151 | else | |
6152 | { | |
6153 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
6154 | gold_assert( | |
6155 | object->local_has_got_offset(r_sym, tls_got_offset_type)); | |
6156 | got_entry_address = target->got_->address() + | |
6157 | got_tlsdesc_offset + | |
6158 | object->local_got_offset(r_sym, tls_got_offset_type); | |
6159 | } | |
6160 | if (tlsopt == tls::TLSOPT_TO_IE) | |
6161 | { | |
6162 | if (tls_segment == NULL) | |
6163 | { | |
6164 | gold_assert(parameters->errors()->error_count() > 0 | |
6165 | || issue_undefined_symbol_error(gsym)); | |
6166 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6167 | } | |
6168 | return tls_desc_gd_to_ie(relinfo, target, rela, r_type, | |
6169 | view, psymval, got_entry_address, | |
6170 | address); | |
6171 | } | |
6172 | ||
6173 | // Now do tlsdesc relocation. | |
6174 | switch (r_type) | |
6175 | { | |
6176 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
6177 | return aarch64_reloc_funcs::adrp(view, | |
6178 | got_entry_address + addend, | |
6179 | address); | |
6180 | break; | |
6181 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
6182 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
6183 | return aarch64_reloc_funcs::template rela_general<32>( | |
6184 | view, got_entry_address, addend, reloc_property); | |
6185 | break; | |
6186 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
6187 | return aarch64_reloc_funcs::STATUS_OKAY; | |
6188 | break; | |
6189 | default: | |
6190 | gold_unreachable(); | |
6191 | } | |
6192 | } | |
6193 | } | |
6194 | break; | |
6195 | ||
8e33481e HS |
6196 | default: |
6197 | gold_error(_("%s: unsupported TLS reloc %u."), | |
6198 | object->name().c_str(), r_type); | |
6199 | } | |
6200 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
3a531937 JY |
6201 | } // End of relocate_tls. |
6202 | ||
6203 | ||
6204 | template<int size, bool big_endian> | |
6205 | inline | |
83a01957 | 6206 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 6207 | Target_aarch64<size, big_endian>::Relocate::tls_gd_to_le( |
83a01957 | 6208 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
6209 | Target_aarch64<size, big_endian>* target, |
6210 | const elfcpp::Rela<size, big_endian>& rela, | |
6211 | unsigned int r_type, | |
6212 | unsigned char* view, | |
6213 | const Symbol_value<size>* psymval) | |
6214 | { | |
83a01957 | 6215 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
6216 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; |
6217 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
6218 | ||
6219 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
6220 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); | |
6221 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); | |
6222 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); | |
6223 | ||
6224 | if (r_type == elfcpp::R_AARCH64_TLSGD_ADD_LO12_NC) | |
6225 | { | |
6226 | // This is the 2nd relocs, optimization should already have been | |
6227 | // done. | |
6228 | gold_assert((insn1 & 0xfff00000) == 0x91400000); | |
6229 | return aarch64_reloc_funcs::STATUS_OKAY; | |
6230 | } | |
6231 | ||
6232 | // The original sequence is - | |
6233 | // 90000000 adrp x0, 0 <main> | |
6234 | // 91000000 add x0, x0, #0x0 | |
6235 | // 94000000 bl 0 <__tls_get_addr> | |
6236 | // optimized to sequence - | |
6237 | // d53bd040 mrs x0, tpidr_el0 | |
6238 | // 91400000 add x0, x0, #0x0, lsl #12 | |
6239 | // 91000000 add x0, x0, #0x0 | |
6240 | ||
6241 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we | |
6242 | // encounter the first relocation "R_AARCH64_TLSGD_ADR_PAGE21". Because we | |
6243 | // have to change "bl tls_get_addr", which does not have a corresponding tls | |
6244 | // relocation type. So before proceeding, we need to make sure compiler | |
6245 | // does not change the sequence. | |
6246 | if(!(insn1 == 0x90000000 // adrp x0,0 | |
6247 | && insn2 == 0x91000000 // add x0, x0, #0x0 | |
6248 | && insn3 == 0x94000000)) // bl 0 | |
6249 | { | |
6250 | // Ideally we should give up gd_to_le relaxation and do gd access. | |
6251 | // However the gd_to_le relaxation decision has been made early | |
6252 | // in the scan stage, where we did not allocate any GOT entry for | |
6253 | // this symbol. Therefore we have to exit and report error now. | |
6254 | gold_error(_("unexpected reloc insn sequence while relaxing " | |
6255 | "tls gd to le for reloc %u."), r_type); | |
6256 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6257 | } | |
6258 | ||
6259 | // Write new insns. | |
6260 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 | |
6261 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 | |
6262 | insn3 = 0x91000000; // add x0, x0, #0x0 | |
6263 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); | |
6264 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); | |
6265 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); | |
6266 | ||
6267 | // Calculate tprel value. | |
6268 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
6269 | gold_assert(tls_segment != NULL); | |
6270 | AArch64_address value = psymval->value(relinfo->object, 0); | |
6271 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6272 | AArch64_address aligned_tcb_size = | |
6273 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
6274 | AArch64_address x = value + aligned_tcb_size; | |
6275 | ||
6276 | // After new insns are written, apply TLSLE relocs. | |
6277 | const AArch64_reloc_property* rp1 = | |
6278 | aarch64_reloc_property_table->get_reloc_property( | |
6279 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); | |
6280 | const AArch64_reloc_property* rp2 = | |
6281 | aarch64_reloc_property_table->get_reloc_property( | |
6282 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); | |
6283 | gold_assert(rp1 != NULL && rp2 != NULL); | |
6284 | ||
6285 | typename aarch64_reloc_funcs::Status s1 = | |
6286 | aarch64_reloc_funcs::template rela_general<32>(view + 4, | |
6287 | x, | |
6288 | addend, | |
6289 | rp1); | |
6290 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) | |
6291 | return s1; | |
6292 | ||
6293 | typename aarch64_reloc_funcs::Status s2 = | |
6294 | aarch64_reloc_funcs::template rela_general<32>(view + 8, | |
6295 | x, | |
6296 | addend, | |
6297 | rp2); | |
6298 | ||
6299 | this->skip_call_tls_get_addr_ = true; | |
6300 | return s2; | |
6301 | } // End of tls_gd_to_le | |
6302 | ||
6303 | ||
9726c3c1 HS |
6304 | template<int size, bool big_endian> |
6305 | inline | |
6306 | typename AArch64_relocate_functions<size, big_endian>::Status | |
6307 | Target_aarch64<size, big_endian>::Relocate::tls_ld_to_le( | |
6308 | const Relocate_info<size, big_endian>* relinfo, | |
6309 | Target_aarch64<size, big_endian>* target, | |
6310 | const elfcpp::Rela<size, big_endian>& rela, | |
6311 | unsigned int r_type, | |
6312 | unsigned char* view, | |
6313 | const Symbol_value<size>* psymval) | |
6314 | { | |
6315 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; | |
6316 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
6317 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
6318 | ||
6319 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
6320 | Insntype insn1 = elfcpp::Swap<32, big_endian>::readval(ip); | |
6321 | Insntype insn2 = elfcpp::Swap<32, big_endian>::readval(ip + 1); | |
6322 | Insntype insn3 = elfcpp::Swap<32, big_endian>::readval(ip + 2); | |
6323 | ||
6324 | if (r_type == elfcpp::R_AARCH64_TLSLD_ADD_LO12_NC) | |
6325 | { | |
6326 | // This is the 2nd relocs, optimization should already have been | |
6327 | // done. | |
6328 | gold_assert((insn1 & 0xfff00000) == 0x91400000); | |
6329 | return aarch64_reloc_funcs::STATUS_OKAY; | |
6330 | } | |
6331 | ||
6332 | // The original sequence is - | |
6333 | // 90000000 adrp x0, 0 <main> | |
6334 | // 91000000 add x0, x0, #0x0 | |
6335 | // 94000000 bl 0 <__tls_get_addr> | |
6336 | // optimized to sequence - | |
6337 | // d53bd040 mrs x0, tpidr_el0 | |
6338 | // 91400000 add x0, x0, #0x0, lsl #12 | |
6339 | // 91000000 add x0, x0, #0x0 | |
6340 | ||
6341 | // Unlike tls_ie_to_le, we change the 3 insns in one function call when we | |
6342 | // encounter the first relocation "R_AARCH64_TLSLD_ADR_PAGE21". Because we | |
6343 | // have to change "bl tls_get_addr", which does not have a corresponding tls | |
6344 | // relocation type. So before proceeding, we need to make sure compiler | |
6345 | // does not change the sequence. | |
6346 | if(!(insn1 == 0x90000000 // adrp x0,0 | |
6347 | && insn2 == 0x91000000 // add x0, x0, #0x0 | |
6348 | && insn3 == 0x94000000)) // bl 0 | |
6349 | { | |
6350 | // Ideally we should give up gd_to_le relaxation and do gd access. | |
6351 | // However the gd_to_le relaxation decision has been made early | |
6352 | // in the scan stage, where we did not allocate any GOT entry for | |
6353 | // this symbol. Therefore we have to exit and report error now. | |
6354 | gold_error(_("unexpected reloc insn sequence while relaxing " | |
6355 | "tls gd to le for reloc %u."), r_type); | |
6356 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6357 | } | |
6358 | ||
6359 | // Write new insns. | |
6360 | insn1 = 0xd53bd040; // mrs x0, tpidr_el0 | |
6361 | insn2 = 0x91400000; // add x0, x0, #0x0, lsl #12 | |
6362 | insn3 = 0x91000000; // add x0, x0, #0x0 | |
6363 | elfcpp::Swap<32, big_endian>::writeval(ip, insn1); | |
6364 | elfcpp::Swap<32, big_endian>::writeval(ip + 1, insn2); | |
6365 | elfcpp::Swap<32, big_endian>::writeval(ip + 2, insn3); | |
6366 | ||
6367 | // Calculate tprel value. | |
6368 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
6369 | gold_assert(tls_segment != NULL); | |
6370 | AArch64_address value = psymval->value(relinfo->object, 0); | |
6371 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6372 | AArch64_address aligned_tcb_size = | |
6373 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
6374 | AArch64_address x = value + aligned_tcb_size; | |
6375 | ||
6376 | // After new insns are written, apply TLSLE relocs. | |
6377 | const AArch64_reloc_property* rp1 = | |
6378 | aarch64_reloc_property_table->get_reloc_property( | |
6379 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_HI12); | |
6380 | const AArch64_reloc_property* rp2 = | |
6381 | aarch64_reloc_property_table->get_reloc_property( | |
6382 | elfcpp::R_AARCH64_TLSLE_ADD_TPREL_LO12); | |
6383 | gold_assert(rp1 != NULL && rp2 != NULL); | |
6384 | ||
6385 | typename aarch64_reloc_funcs::Status s1 = | |
6386 | aarch64_reloc_funcs::template rela_general<32>(view + 4, | |
6387 | x, | |
6388 | addend, | |
6389 | rp1); | |
6390 | if (s1 != aarch64_reloc_funcs::STATUS_OKAY) | |
6391 | return s1; | |
6392 | ||
6393 | typename aarch64_reloc_funcs::Status s2 = | |
6394 | aarch64_reloc_funcs::template rela_general<32>(view + 8, | |
6395 | x, | |
6396 | addend, | |
6397 | rp2); | |
6398 | ||
6399 | this->skip_call_tls_get_addr_ = true; | |
6400 | return s2; | |
6401 | ||
6402 | } // End of tls_ld_to_le | |
6403 | ||
3a531937 JY |
6404 | template<int size, bool big_endian> |
6405 | inline | |
83a01957 | 6406 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 6407 | Target_aarch64<size, big_endian>::Relocate::tls_ie_to_le( |
83a01957 | 6408 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
6409 | Target_aarch64<size, big_endian>* target, |
6410 | const elfcpp::Rela<size, big_endian>& rela, | |
6411 | unsigned int r_type, | |
6412 | unsigned char* view, | |
6413 | const Symbol_value<size>* psymval) | |
6414 | { | |
6415 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
6416 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
83a01957 | 6417 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
6418 | |
6419 | AArch64_address value = psymval->value(relinfo->object, 0); | |
6420 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
6421 | AArch64_address aligned_tcb_address = | |
6422 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
6423 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6424 | AArch64_address x = value + addend + aligned_tcb_address; | |
6425 | // "x" is the offset to tp, we can only do this if x is within | |
6426 | // range [0, 2^32-1] | |
6427 | if (!(size == 32 || (size == 64 && (static_cast<uint64_t>(x) >> 32) == 0))) | |
6428 | { | |
6429 | gold_error(_("TLS variable referred by reloc %u is too far from TP."), | |
6430 | r_type); | |
6431 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6432 | } | |
6433 | ||
6434 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
6435 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); | |
6436 | unsigned int regno; | |
6437 | Insntype newinsn; | |
6438 | if (r_type == elfcpp::R_AARCH64_TLSIE_ADR_GOTTPREL_PAGE21) | |
6439 | { | |
6440 | // Generate movz. | |
6441 | regno = (insn & 0x1f); | |
6442 | newinsn = (0xd2a00000 | regno) | (((x >> 16) & 0xffff) << 5); | |
6443 | } | |
6444 | else if (r_type == elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC) | |
6445 | { | |
6446 | // Generate movk. | |
6447 | regno = (insn & 0x1f); | |
6448 | gold_assert(regno == ((insn >> 5) & 0x1f)); | |
6449 | newinsn = (0xf2800000 | regno) | ((x & 0xffff) << 5); | |
6450 | } | |
6451 | else | |
9726c3c1 | 6452 | gold_unreachable(); |
3a531937 JY |
6453 | |
6454 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); | |
6455 | return aarch64_reloc_funcs::STATUS_OKAY; | |
6456 | } // End of tls_ie_to_le | |
6457 | ||
6458 | ||
6459 | template<int size, bool big_endian> | |
6460 | inline | |
83a01957 | 6461 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 6462 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_le( |
83a01957 | 6463 | const Relocate_info<size, big_endian>* relinfo, |
3a531937 JY |
6464 | Target_aarch64<size, big_endian>* target, |
6465 | const elfcpp::Rela<size, big_endian>& rela, | |
6466 | unsigned int r_type, | |
6467 | unsigned char* view, | |
6468 | const Symbol_value<size>* psymval) | |
6469 | { | |
6470 | typedef typename elfcpp::Elf_types<size>::Elf_Addr AArch64_address; | |
6471 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
83a01957 | 6472 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
6473 | |
6474 | // TLSDESC-GD sequence is like: | |
6475 | // adrp x0, :tlsdesc:v1 | |
6476 | // ldr x1, [x0, #:tlsdesc_lo12:v1] | |
6477 | // add x0, x0, :tlsdesc_lo12:v1 | |
6478 | // .tlsdesccall v1 | |
6479 | // blr x1 | |
6480 | // After desc_gd_to_le optimization, the sequence will be like: | |
6481 | // movz x0, #0x0, lsl #16 | |
6482 | // movk x0, #0x10 | |
6483 | // nop | |
6484 | // nop | |
6485 | ||
6486 | // Calculate tprel value. | |
6487 | Output_segment* tls_segment = relinfo->layout->tls_segment(); | |
6488 | gold_assert(tls_segment != NULL); | |
6489 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
6490 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6491 | AArch64_address value = psymval->value(relinfo->object, addend); | |
6492 | AArch64_address aligned_tcb_size = | |
6493 | align_address(target->tcb_size(), tls_segment->maximum_alignment()); | |
6494 | AArch64_address x = value + aligned_tcb_size; | |
6495 | // x is the offset to tp, we can only do this if x is within range | |
6496 | // [0, 2^32-1]. If x is out of range, fail and exit. | |
6497 | if (size == 64 && (static_cast<uint64_t>(x) >> 32) != 0) | |
6498 | { | |
6499 | gold_error(_("TLS variable referred by reloc %u is too far from TP. " | |
6500 | "We Can't do gd_to_le relaxation.\n"), r_type); | |
6501 | return aarch64_reloc_funcs::STATUS_BAD_RELOC; | |
6502 | } | |
6503 | Insntype newinsn; | |
6504 | switch (r_type) | |
6505 | { | |
6506 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
6507 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
6508 | // Change to nop | |
6509 | newinsn = 0xd503201f; | |
6510 | break; | |
6511 | ||
6512 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
6513 | // Change to movz. | |
6514 | newinsn = 0xd2a00000 | (((x >> 16) & 0xffff) << 5); | |
6515 | break; | |
6516 | ||
6517 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
6518 | // Change to movk. | |
6519 | newinsn = 0xf2800000 | ((x & 0xffff) << 5); | |
6520 | break; | |
6521 | ||
6522 | default: | |
6523 | gold_error(_("unsupported tlsdesc gd_to_le optimization on reloc %u"), | |
6524 | r_type); | |
6525 | gold_unreachable(); | |
6526 | } | |
6527 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); | |
6528 | return aarch64_reloc_funcs::STATUS_OKAY; | |
6529 | } // End of tls_desc_gd_to_le | |
6530 | ||
6531 | ||
6532 | template<int size, bool big_endian> | |
6533 | inline | |
83a01957 | 6534 | typename AArch64_relocate_functions<size, big_endian>::Status |
3a531937 | 6535 | Target_aarch64<size, big_endian>::Relocate::tls_desc_gd_to_ie( |
83a01957 | 6536 | const Relocate_info<size, big_endian>* /* relinfo */, |
3a531937 JY |
6537 | Target_aarch64<size, big_endian>* /* target */, |
6538 | const elfcpp::Rela<size, big_endian>& rela, | |
6539 | unsigned int r_type, | |
6540 | unsigned char* view, | |
6541 | const Symbol_value<size>* /* psymval */, | |
6542 | typename elfcpp::Elf_types<size>::Elf_Addr got_entry_address, | |
6543 | typename elfcpp::Elf_types<size>::Elf_Addr address) | |
6544 | { | |
6545 | typedef typename elfcpp::Swap<32, big_endian>::Valtype Insntype; | |
83a01957 | 6546 | typedef AArch64_relocate_functions<size, big_endian> aarch64_reloc_funcs; |
3a531937 JY |
6547 | |
6548 | // TLSDESC-GD sequence is like: | |
6549 | // adrp x0, :tlsdesc:v1 | |
6550 | // ldr x1, [x0, #:tlsdesc_lo12:v1] | |
6551 | // add x0, x0, :tlsdesc_lo12:v1 | |
6552 | // .tlsdesccall v1 | |
6553 | // blr x1 | |
6554 | // After desc_gd_to_ie optimization, the sequence will be like: | |
6555 | // adrp x0, :tlsie:v1 | |
6556 | // ldr x0, [x0, :tlsie_lo12:v1] | |
6557 | // nop | |
6558 | // nop | |
6559 | ||
6560 | Insntype* ip = reinterpret_cast<Insntype*>(view); | |
6561 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
6562 | Insntype newinsn; | |
6563 | switch (r_type) | |
6564 | { | |
6565 | case elfcpp::R_AARCH64_TLSDESC_ADD_LO12: | |
6566 | case elfcpp::R_AARCH64_TLSDESC_CALL: | |
6567 | // Change to nop | |
6568 | newinsn = 0xd503201f; | |
6569 | elfcpp::Swap<32, big_endian>::writeval(ip, newinsn); | |
6570 | break; | |
6571 | ||
6572 | case elfcpp::R_AARCH64_TLSDESC_ADR_PAGE21: | |
6573 | { | |
6574 | return aarch64_reloc_funcs::adrp(view, got_entry_address + addend, | |
6575 | address); | |
6576 | } | |
6577 | break; | |
6578 | ||
6579 | case elfcpp::R_AARCH64_TLSDESC_LD64_LO12: | |
6580 | { | |
bb779192 HS |
6581 | // Set ldr target register to be x0. |
6582 | Insntype insn = elfcpp::Swap<32, big_endian>::readval(ip); | |
6583 | insn &= 0xffffffe0; | |
6584 | elfcpp::Swap<32, big_endian>::writeval(ip, insn); | |
6585 | // Do relocation. | |
3a531937 JY |
6586 | const AArch64_reloc_property* reloc_property = |
6587 | aarch64_reloc_property_table->get_reloc_property( | |
6588 | elfcpp::R_AARCH64_TLSIE_LD64_GOTTPREL_LO12_NC); | |
6589 | return aarch64_reloc_funcs::template rela_general<32>( | |
6590 | view, got_entry_address, addend, reloc_property); | |
6591 | } | |
6592 | break; | |
8e33481e | 6593 | |
3a531937 JY |
6594 | default: |
6595 | gold_error(_("Don't support tlsdesc gd_to_ie optimization on reloc %u"), | |
6596 | r_type); | |
6597 | gold_unreachable(); | |
6598 | } | |
6599 | return aarch64_reloc_funcs::STATUS_OKAY; | |
6600 | } // End of tls_desc_gd_to_ie | |
8e33481e | 6601 | |
053a4d68 JY |
6602 | // Relocate section data. |
6603 | ||
6604 | template<int size, bool big_endian> | |
6605 | void | |
6606 | Target_aarch64<size, big_endian>::relocate_section( | |
9363c7c3 | 6607 | const Relocate_info<size, big_endian>* relinfo, |
053a4d68 | 6608 | unsigned int sh_type, |
9363c7c3 JY |
6609 | const unsigned char* prelocs, |
6610 | size_t reloc_count, | |
6611 | Output_section* output_section, | |
6612 | bool needs_special_offset_handling, | |
6613 | unsigned char* view, | |
6614 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
6615 | section_size_type view_size, | |
6616 | const Reloc_symbol_changes* reloc_symbol_changes) | |
053a4d68 | 6617 | { |
053a4d68 | 6618 | gold_assert(sh_type == elfcpp::SHT_RELA); |
9363c7c3 JY |
6619 | typedef typename Target_aarch64<size, big_endian>::Relocate AArch64_relocate; |
6620 | gold::relocate_section<size, big_endian, Target_aarch64, elfcpp::SHT_RELA, | |
6621 | AArch64_relocate, gold::Default_comdat_behavior>( | |
6622 | relinfo, | |
6623 | this, | |
6624 | prelocs, | |
6625 | reloc_count, | |
6626 | output_section, | |
6627 | needs_special_offset_handling, | |
6628 | view, | |
6629 | address, | |
6630 | view_size, | |
6631 | reloc_symbol_changes); | |
053a4d68 JY |
6632 | } |
6633 | ||
6634 | // Return the size of a relocation while scanning during a relocatable | |
6635 | // link. | |
6636 | ||
6637 | template<int size, bool big_endian> | |
6638 | unsigned int | |
6639 | Target_aarch64<size, big_endian>::Relocatable_size_for_reloc:: | |
6640 | get_size_for_reloc( | |
6641 | unsigned int , | |
6642 | Relobj* ) | |
6643 | { | |
6644 | // We will never support SHT_REL relocations. | |
6645 | gold_unreachable(); | |
6646 | return 0; | |
6647 | } | |
6648 | ||
6649 | // Scan the relocs during a relocatable link. | |
6650 | ||
6651 | template<int size, bool big_endian> | |
6652 | void | |
6653 | Target_aarch64<size, big_endian>::scan_relocatable_relocs( | |
8e33481e HS |
6654 | Symbol_table* symtab, |
6655 | Layout* layout, | |
6656 | Sized_relobj_file<size, big_endian>* object, | |
6657 | unsigned int data_shndx, | |
053a4d68 | 6658 | unsigned int sh_type, |
8e33481e HS |
6659 | const unsigned char* prelocs, |
6660 | size_t reloc_count, | |
6661 | Output_section* output_section, | |
6662 | bool needs_special_offset_handling, | |
6663 | size_t local_symbol_count, | |
6664 | const unsigned char* plocal_symbols, | |
6665 | Relocatable_relocs* rr) | |
053a4d68 | 6666 | { |
053a4d68 | 6667 | gold_assert(sh_type == elfcpp::SHT_RELA); |
8e33481e HS |
6668 | |
6669 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
6670 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
6671 | ||
6672 | gold::scan_relocatable_relocs<size, big_endian, elfcpp::SHT_RELA, | |
6673 | Scan_relocatable_relocs>( | |
6674 | symtab, | |
6675 | layout, | |
6676 | object, | |
6677 | data_shndx, | |
6678 | prelocs, | |
6679 | reloc_count, | |
6680 | output_section, | |
6681 | needs_special_offset_handling, | |
6682 | local_symbol_count, | |
6683 | plocal_symbols, | |
6684 | rr); | |
053a4d68 JY |
6685 | } |
6686 | ||
6687 | // Relocate a section during a relocatable link. | |
6688 | ||
6689 | template<int size, bool big_endian> | |
6690 | void | |
6691 | Target_aarch64<size, big_endian>::relocate_relocs( | |
8e33481e | 6692 | const Relocate_info<size, big_endian>* relinfo, |
053a4d68 | 6693 | unsigned int sh_type, |
8e33481e HS |
6694 | const unsigned char* prelocs, |
6695 | size_t reloc_count, | |
6696 | Output_section* output_section, | |
6697 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, | |
6698 | const Relocatable_relocs* rr, | |
6699 | unsigned char* view, | |
6700 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
6701 | section_size_type view_size, | |
6702 | unsigned char* reloc_view, | |
6703 | section_size_type reloc_view_size) | |
053a4d68 | 6704 | { |
053a4d68 | 6705 | gold_assert(sh_type == elfcpp::SHT_RELA); |
8e33481e HS |
6706 | |
6707 | gold::relocate_relocs<size, big_endian, elfcpp::SHT_RELA>( | |
6708 | relinfo, | |
6709 | prelocs, | |
6710 | reloc_count, | |
6711 | output_section, | |
6712 | offset_in_output_section, | |
6713 | rr, | |
6714 | view, | |
6715 | view_address, | |
6716 | view_size, | |
6717 | reloc_view, | |
6718 | reloc_view_size); | |
053a4d68 JY |
6719 | } |
6720 | ||
83a01957 | 6721 | |
053a4d68 JY |
6722 | // The selector for aarch64 object files. |
6723 | ||
6724 | template<int size, bool big_endian> | |
6725 | class Target_selector_aarch64 : public Target_selector | |
6726 | { | |
6727 | public: | |
9363c7c3 | 6728 | Target_selector_aarch64(); |
053a4d68 JY |
6729 | |
6730 | virtual Target* | |
6731 | do_instantiate_target() | |
6732 | { return new Target_aarch64<size, big_endian>(); } | |
6733 | }; | |
6734 | ||
9363c7c3 JY |
6735 | template<> |
6736 | Target_selector_aarch64<32, true>::Target_selector_aarch64() | |
6737 | : Target_selector(elfcpp::EM_AARCH64, 32, true, | |
6738 | "elf32-bigaarch64", "aarch64_elf32_be_vec") | |
6739 | { } | |
6740 | ||
6741 | template<> | |
6742 | Target_selector_aarch64<32, false>::Target_selector_aarch64() | |
6743 | : Target_selector(elfcpp::EM_AARCH64, 32, false, | |
6744 | "elf32-littleaarch64", "aarch64_elf32_le_vec") | |
6745 | { } | |
6746 | ||
6747 | template<> | |
6748 | Target_selector_aarch64<64, true>::Target_selector_aarch64() | |
6749 | : Target_selector(elfcpp::EM_AARCH64, 64, true, | |
6750 | "elf64-bigaarch64", "aarch64_elf64_be_vec") | |
6751 | { } | |
6752 | ||
6753 | template<> | |
6754 | Target_selector_aarch64<64, false>::Target_selector_aarch64() | |
6755 | : Target_selector(elfcpp::EM_AARCH64, 64, false, | |
6756 | "elf64-littleaarch64", "aarch64_elf64_le_vec") | |
6757 | { } | |
6758 | ||
053a4d68 JY |
6759 | Target_selector_aarch64<32, true> target_selector_aarch64elf32b; |
6760 | Target_selector_aarch64<32, false> target_selector_aarch64elf32; | |
6761 | Target_selector_aarch64<64, true> target_selector_aarch64elfb; | |
6762 | Target_selector_aarch64<64, false> target_selector_aarch64elf; | |
6763 | ||
053a4d68 | 6764 | } // End anonymous namespace. |