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gdb: add target_ops::supports_displaced_step
[deliverable/binutils-gdb.git] / gold / x86_64.cc
CommitLineData
2e30d253
ILT		 1// x86_64.cc -- x86_64 target support for gold.
2
b3adc24a 3// Copyright (C) 2006-2020 Free Software Foundation, Inc.
2e30d253
ILT		 4// Written by Ian Lance Taylor <iant@google.com>.
5
6// This file is part of gold.
7
8b105e34
ILT		 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
2e30d253
ILT		 11// (at your option) any later version.
12
8b105e34
ILT		 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.
2e30d253
ILT		 22
23#include "gold.h"
24
25#include <cstring>
26
27#include "elfcpp.h"
07a60597 28#include "dwarf.h"
2e30d253
ILT		 29#include "parameters.h"
30#include "reloc.h"
31#include "x86_64.h"
32#include "object.h"
33#include "symtab.h"
34#include "layout.h"
35#include "output.h"
12c0daef 36#include "copy-relocs.h"
2e30d253
ILT		 37#include "target.h"
38#include "target-reloc.h"
39#include "target-select.h"
e041f13d 40#include "tls.h"
36959681 41#include "freebsd.h"
2e702c99 42#include "nacl.h"
f345227a 43#include "gc.h"
21bb3914 44#include "icf.h"
2e30d253
ILT		 45
46namespace
47{
48
49using namespace gold;
50
57b2284c
CC		 51// A class to handle the .got.plt section.
52
53class Output_data_got_plt_x86_64 : public Output_section_data_build
54{
55 public:
56 Output_data_got_plt_x86_64(Layout* layout)
57 : Output_section_data_build(8),
58 layout_(layout)
59 { }
60
61 Output_data_got_plt_x86_64(Layout* layout, off_t data_size)
62 : Output_section_data_build(data_size, 8),
63 layout_(layout)
64 { }
65
66 protected:
67 // Write out the PLT data.
68 void
69 do_write(Output_file*);
70
71 // Write to a map file.
72 void
73 do_print_to_mapfile(Mapfile* mapfile) const
74 { mapfile->print_output_data(this, "** GOT PLT"); }
75
76 private:
77 // A pointer to the Layout class, so that we can find the .dynamic
78 // section when we write out the GOT PLT section.
79 Layout* layout_;
80};
81
7223e9ca 82// A class to handle the PLT data.
2e702c99
RM		 83// This is an abstract base class that handles most of the linker details
84// but does not know the actual contents of PLT entries. The derived
85// classes below fill in those details.
7223e9ca 86
fc51264f 87template<int size>
7223e9ca
ILT		 88class Output_data_plt_x86_64 : public Output_section_data
89{
90 public:
fc51264f 91 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
7223e9ca 92
2e702c99
RM		 93 Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
94 Output_data_got<64, false>* got,
57b2284c 95 Output_data_got_plt_x86_64* got_plt,
67181c72 96 Output_data_space* got_irelative)
57b2284c 97 : Output_section_data(addralign), tlsdesc_rel_(NULL),
7d172687
ILT		 98 irelative_rel_(NULL), got_(got), got_plt_(got_plt),
99 got_irelative_(got_irelative), count_(0), irelative_count_(0),
100 tlsdesc_got_offset_(-1U), free_list_()
67181c72
ILT		 101 { this->init(layout); }
102
2e702c99
RM		 103 Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
104 Output_data_got<64, false>* got,
57b2284c 105 Output_data_got_plt_x86_64* got_plt,
67181c72 106 Output_data_space* got_irelative,
4829d394 107 unsigned int plt_count)
2e702c99
RM		 108 : Output_section_data((plt_count + 1) * plt_entry_size,
109 plt_entry_size, false),
57b2284c 110 tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
7d172687
ILT		 111 got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
112 irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
4829d394 113 {
67181c72 114 this->init(layout);
4829d394
CC		 115
116 // Initialize the free list and reserve the first entry.
117 this->free_list_.init((plt_count + 1) * plt_entry_size, false);
118 this->free_list_.remove(0, plt_entry_size);
119 }
120
121 // Initialize the PLT section.
122 void
67181c72 123 init(Layout* layout);
7223e9ca
ILT		 124
125 // Add an entry to the PLT.
126 void
67181c72 127 add_entry(Symbol_table*, Layout*, Symbol* gsym);
7223e9ca
ILT		 128
129 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
130 unsigned int
67181c72 131 add_local_ifunc_entry(Symbol_table* symtab, Layout*,
fc51264f 132 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 133 unsigned int local_sym_index);
134
4829d394
CC		 135 // Add the relocation for a PLT entry.
136 void
67181c72
ILT		 137 add_relocation(Symbol_table*, Layout*, Symbol* gsym,
138 unsigned int got_offset);
4829d394 139
7223e9ca
ILT		 140 // Add the reserved TLSDESC_PLT entry to the PLT.
141 void
142 reserve_tlsdesc_entry(unsigned int got_offset)
143 { this->tlsdesc_got_offset_ = got_offset; }
144
145 // Return true if a TLSDESC_PLT entry has been reserved.
146 bool
147 has_tlsdesc_entry() const
148 { return this->tlsdesc_got_offset_ != -1U; }
149
150 // Return the GOT offset for the reserved TLSDESC_PLT entry.
151 unsigned int
152 get_tlsdesc_got_offset() const
153 { return this->tlsdesc_got_offset_; }
154
155 // Return the offset of the reserved TLSDESC_PLT entry.
156 unsigned int
157 get_tlsdesc_plt_offset() const
2e702c99
RM		 158 {
159 return ((this->count_ + this->irelative_count_ + 1)
160 * this->get_plt_entry_size());
161 }
7223e9ca
ILT		 162
163 // Return the .rela.plt section data.
164 Reloc_section*
165 rela_plt()
166 { return this->rel_; }
167
168 // Return where the TLSDESC relocations should go.
169 Reloc_section*
170 rela_tlsdesc(Layout*);
171
67181c72
ILT		 172 // Return where the IRELATIVE relocations should go in the PLT
173 // relocations.
174 Reloc_section*
175 rela_irelative(Symbol_table*, Layout*);
176
177 // Return whether we created a section for IRELATIVE relocations.
178 bool
179 has_irelative_section() const
180 { return this->irelative_rel_ != NULL; }
181
7a0c0a14
CC		 182 // Get count of regular PLT entries.
183 unsigned int
184 regular_count() const
185 { return this->count_; }
186
187 // Return the total number of PLT entries.
7223e9ca
ILT		 188 unsigned int
189 entry_count() const
67181c72 190 { return this->count_ + this->irelative_count_; }
7223e9ca
ILT		 191
192 // Return the offset of the first non-reserved PLT entry.
2e702c99 193 unsigned int
7223e9ca 194 first_plt_entry_offset()
2e702c99 195 { return this->get_plt_entry_size(); }
7223e9ca
ILT		 196
197 // Return the size of a PLT entry.
2e702c99
RM		 198 unsigned int
199 get_plt_entry_size() const
200 { return this->do_get_plt_entry_size(); }
7223e9ca 201
4829d394
CC		 202 // Reserve a slot in the PLT for an existing symbol in an incremental update.
203 void
204 reserve_slot(unsigned int plt_index)
205 {
2e702c99
RM		 206 this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(),
207 (plt_index + 2) * this->get_plt_entry_size());
4829d394
CC		 208 }
209
67181c72
ILT		 210 // Return the PLT address to use for a global symbol.
211 uint64_t
7a0c0a14
CC		 212 address_for_global(const Symbol* sym)
213 { return do_address_for_global(sym); }
67181c72
ILT		 214
215 // Return the PLT address to use for a local symbol.
216 uint64_t
7a0c0a14
CC		 217 address_for_local(const Relobj* obj, unsigned int symndx)
218 { return do_address_for_local(obj, symndx); }
67181c72 219
2e702c99
RM		 220 // Add .eh_frame information for the PLT.
221 void
222 add_eh_frame(Layout* layout)
223 { this->do_add_eh_frame(layout); }
224
7223e9ca 225 protected:
7a0c0a14
CC		 226 Output_data_got<64, false>*
227 got() const
228 { return this->got_; }
229
230 Output_data_got_plt_x86_64*
231 got_plt() const
232 { return this->got_plt_; }
233
234 Output_data_space*
235 got_irelative() const
236 { return this->got_irelative_; }
237
2e702c99
RM		 238 // Fill in the first PLT entry.
239 void
240 fill_first_plt_entry(unsigned char* pov,
241 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
242 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
243 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
244
245 // Fill in a normal PLT entry. Returns the offset into the entry that
246 // should be the initial GOT slot value.
247 unsigned int
248 fill_plt_entry(unsigned char* pov,
249 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
250 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
251 unsigned int got_offset,
252 unsigned int plt_offset,
253 unsigned int plt_index)
254 {
255 return this->do_fill_plt_entry(pov, got_address, plt_address,
256 got_offset, plt_offset, plt_index);
257 }
258
259 // Fill in the reserved TLSDESC PLT entry.
260 void
261 fill_tlsdesc_entry(unsigned char* pov,
262 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
263 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
264 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
265 unsigned int tlsdesc_got_offset,
266 unsigned int plt_offset)
267 {
268 this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
269 tlsdesc_got_offset, plt_offset);
270 }
271
272 virtual unsigned int
273 do_get_plt_entry_size() const = 0;
274
275 virtual void
276 do_fill_first_plt_entry(unsigned char* pov,
277 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
278 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
279 = 0;
280
281 virtual unsigned int
282 do_fill_plt_entry(unsigned char* pov,
283 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
284 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
285 unsigned int got_offset,
286 unsigned int plt_offset,
287 unsigned int plt_index) = 0;
288
289 virtual void
290 do_fill_tlsdesc_entry(unsigned char* pov,
291 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
292 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
293 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
294 unsigned int tlsdesc_got_offset,
295 unsigned int plt_offset) = 0;
296
7a0c0a14
CC		 297 // Return the PLT address to use for a global symbol.
298 virtual uint64_t
299 do_address_for_global(const Symbol* sym);
300
301 // Return the PLT address to use for a local symbol.
302 virtual uint64_t
303 do_address_for_local(const Relobj* obj, unsigned int symndx);
304
2e702c99
RM		 305 virtual void
306 do_add_eh_frame(Layout* layout) = 0;
307
7223e9ca
ILT		 308 void
309 do_adjust_output_section(Output_section* os);
310
311 // Write to a map file.
312 void
313 do_print_to_mapfile(Mapfile* mapfile) const
314 { mapfile->print_output_data(this, _("** PLT")); }
315
2e702c99 316 // The CIE of the .eh_frame unwind information for the PLT.
07a60597 317 static const int plt_eh_frame_cie_size = 16;
07a60597 318 static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
7223e9ca 319
2e702c99 320 private:
7223e9ca
ILT		 321 // Set the final size.
322 void
323 set_final_data_size();
324
325 // Write out the PLT data.
326 void
327 do_write(Output_file*);
328
329 // The reloc section.
330 Reloc_section* rel_;
331 // The TLSDESC relocs, if necessary. These must follow the regular
332 // PLT relocs.
333 Reloc_section* tlsdesc_rel_;
67181c72
ILT		 334 // The IRELATIVE relocs, if necessary. These must follow the
335 // regular PLT relocations and the TLSDESC relocations.
336 Reloc_section* irelative_rel_;
7223e9ca
ILT		 337 // The .got section.
338 Output_data_got<64, false>* got_;
339 // The .got.plt section.
57b2284c 340 Output_data_got_plt_x86_64* got_plt_;
67181c72
ILT		 341 // The part of the .got.plt section used for IRELATIVE relocs.
342 Output_data_space* got_irelative_;
7223e9ca
ILT		 343 // The number of PLT entries.
344 unsigned int count_;
67181c72
ILT		 345 // Number of PLT entries with R_X86_64_IRELATIVE relocs. These
346 // follow the regular PLT entries.
347 unsigned int irelative_count_;
7223e9ca
ILT		 348 // Offset of the reserved TLSDESC_GOT entry when needed.
349 unsigned int tlsdesc_got_offset_;
4829d394
CC		 350 // List of available regions within the section, for incremental
351 // update links.
352 Free_list free_list_;
7223e9ca 353};
2e30d253 354
2e702c99
RM		 355template<int size>
356class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
357{
358 public:
359 Output_data_plt_x86_64_standard(Layout* layout,
360 Output_data_got<64, false>* got,
57b2284c 361 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 362 Output_data_space* got_irelative)
363 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
364 got, got_plt, got_irelative)
365 { }
366
367 Output_data_plt_x86_64_standard(Layout* layout,
368 Output_data_got<64, false>* got,
57b2284c 369 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 370 Output_data_space* got_irelative,
371 unsigned int plt_count)
372 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
373 got, got_plt, got_irelative,
374 plt_count)
375 { }
376
377 protected:
378 virtual unsigned int
379 do_get_plt_entry_size() const
380 { return plt_entry_size; }
381
382 virtual void
383 do_add_eh_frame(Layout* layout)
384 {
385 layout->add_eh_frame_for_plt(this,
386 this->plt_eh_frame_cie,
387 this->plt_eh_frame_cie_size,
388 plt_eh_frame_fde,
389 plt_eh_frame_fde_size);
390 }
391
392 virtual void
393 do_fill_first_plt_entry(unsigned char* pov,
394 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
395 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
396
397 virtual unsigned int
398 do_fill_plt_entry(unsigned char* pov,
399 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
400 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
401 unsigned int got_offset,
402 unsigned int plt_offset,
403 unsigned int plt_index);
404
405 virtual void
406 do_fill_tlsdesc_entry(unsigned char* pov,
407 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
408 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
409 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
410 unsigned int tlsdesc_got_offset,
411 unsigned int plt_offset);
412
413 private:
414 // The size of an entry in the PLT.
415 static const int plt_entry_size = 16;
416
417 // The first entry in the PLT.
418 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
419 // procedure linkage table for both programs and shared objects."
420 static const unsigned char first_plt_entry[plt_entry_size];
421
422 // Other entries in the PLT for an executable.
423 static const unsigned char plt_entry[plt_entry_size];
424
425 // The reserved TLSDESC entry in the PLT for an executable.
426 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
427
428 // The .eh_frame unwind information for the PLT.
429 static const int plt_eh_frame_fde_size = 32;
430 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
431};
432
7a0c0a14
CC		 433class Output_data_plt_x86_64_bnd : public Output_data_plt_x86_64<64>
434{
435 public:
436 Output_data_plt_x86_64_bnd(Layout* layout,
437 Output_data_got<64, false>* got,
438 Output_data_got_plt_x86_64* got_plt,
439 Output_data_space* got_irelative)
440 : Output_data_plt_x86_64<64>(layout, plt_entry_size,
441 got, got_plt, got_irelative),
442 aplt_offset_(0)
443 { }
444
445 Output_data_plt_x86_64_bnd(Layout* layout,
446 Output_data_got<64, false>* got,
447 Output_data_got_plt_x86_64* got_plt,
448 Output_data_space* got_irelative,
449 unsigned int plt_count)
450 : Output_data_plt_x86_64<64>(layout, plt_entry_size,
451 got, got_plt, got_irelative,
452 plt_count),
453 aplt_offset_(0)
454 { }
455
456 protected:
457 virtual unsigned int
458 do_get_plt_entry_size() const
459 { return plt_entry_size; }
460
461 // Return the PLT address to use for a global symbol.
462 uint64_t
463 do_address_for_global(const Symbol*);
464
465 // Return the PLT address to use for a local symbol.
466 uint64_t
467 do_address_for_local(const Relobj*, unsigned int symndx);
468
469 virtual void
470 do_add_eh_frame(Layout* layout)
471 {
472 layout->add_eh_frame_for_plt(this,
473 this->plt_eh_frame_cie,
474 this->plt_eh_frame_cie_size,
475 plt_eh_frame_fde,
476 plt_eh_frame_fde_size);
477 }
478
479 virtual void
480 do_fill_first_plt_entry(unsigned char* pov,
976e204b
CC		 481 elfcpp::Elf_types<64>::Elf_Addr got_addr,
482 elfcpp::Elf_types<64>::Elf_Addr plt_addr);
7a0c0a14
CC		 483
484 virtual unsigned int
485 do_fill_plt_entry(unsigned char* pov,
976e204b
CC		 486 elfcpp::Elf_types<64>::Elf_Addr got_address,
487 elfcpp::Elf_types<64>::Elf_Addr plt_address,
7a0c0a14
CC		 488 unsigned int got_offset,
489 unsigned int plt_offset,
490 unsigned int plt_index);
491
492 virtual void
493 do_fill_tlsdesc_entry(unsigned char* pov,
976e204b
CC		 494 elfcpp::Elf_types<64>::Elf_Addr got_address,
495 elfcpp::Elf_types<64>::Elf_Addr plt_address,
496 elfcpp::Elf_types<64>::Elf_Addr got_base,
7a0c0a14
CC		 497 unsigned int tlsdesc_got_offset,
498 unsigned int plt_offset);
499
500 void
501 fill_aplt_entry(unsigned char* pov,
976e204b
CC		 502 elfcpp::Elf_types<64>::Elf_Addr got_address,
503 elfcpp::Elf_types<64>::Elf_Addr plt_address,
7a0c0a14
CC		 504 unsigned int got_offset,
505 unsigned int plt_offset,
506 unsigned int plt_index);
507
508 private:
509 // Set the final size.
510 void
511 set_final_data_size();
512
513 // Write out the BND PLT data.
514 void
515 do_write(Output_file*);
516
517 // Offset of the Additional PLT (if using -z bndplt).
518 unsigned int aplt_offset_;
519
520 // The size of an entry in the PLT.
521 static const int plt_entry_size = 16;
522
523 // The size of an entry in the additional PLT.
524 static const int aplt_entry_size = 8;
525
526 // The first entry in the PLT.
527 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
528 // procedure linkage table for both programs and shared objects."
529 static const unsigned char first_plt_entry[plt_entry_size];
530
531 // Other entries in the PLT for an executable.
532 static const unsigned char plt_entry[plt_entry_size];
533
534 // Entries in the additional PLT.
535 static const unsigned char aplt_entry[aplt_entry_size];
536
537 // The reserved TLSDESC entry in the PLT for an executable.
538 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
539
540 // The .eh_frame unwind information for the PLT.
541 static const int plt_eh_frame_fde_size = 32;
542 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
543};
544
750ea5ed
CC		 545// We use this PLT when Indirect Branch Tracking (IBT) is enabled.
546
547template <int size>
548class Output_data_plt_x86_64_ibt : public Output_data_plt_x86_64<size>
549{
550 public:
551 Output_data_plt_x86_64_ibt(Layout* layout,
552 Output_data_got<64, false>* got,
553 Output_data_got_plt_x86_64* got_plt,
554 Output_data_space* got_irelative)
555 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
556 got, got_plt, got_irelative),
557 aplt_offset_(0)
558 { }
559
560 Output_data_plt_x86_64_ibt(Layout* layout,
561 Output_data_got<64, false>* got,
562 Output_data_got_plt_x86_64* got_plt,
563 Output_data_space* got_irelative,
564 unsigned int plt_count)
565 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
566 got, got_plt, got_irelative,
567 plt_count),
568 aplt_offset_(0)
569 { }
570
571 protected:
572 virtual unsigned int
573 do_get_plt_entry_size() const
574 { return plt_entry_size; }
575
576 // Return the PLT address to use for a global symbol.
577 uint64_t
578 do_address_for_global(const Symbol*);
579
580 // Return the PLT address to use for a local symbol.
581 uint64_t
582 do_address_for_local(const Relobj*, unsigned int symndx);
583
584 virtual void
585 do_add_eh_frame(Layout* layout)
586 {
587 layout->add_eh_frame_for_plt(this,
588 this->plt_eh_frame_cie,
589 this->plt_eh_frame_cie_size,
590 plt_eh_frame_fde,
591 plt_eh_frame_fde_size);
592 }
593
594 virtual void
595 do_fill_first_plt_entry(unsigned char* pov,
596 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
597 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
598
599 virtual unsigned int
600 do_fill_plt_entry(unsigned char* pov,
601 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
602 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
603 unsigned int got_offset,
604 unsigned int plt_offset,
605 unsigned int plt_index);
606
607 virtual void
608 do_fill_tlsdesc_entry(unsigned char* pov,
609 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
610 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
611 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
612 unsigned int tlsdesc_got_offset,
613 unsigned int plt_offset);
614
615 void
616 fill_aplt_entry(unsigned char* pov,
617 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
618 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
619 unsigned int got_offset,
620 unsigned int plt_offset,
621 unsigned int plt_index);
622
623 private:
624 // Set the final size.
625 void
626 set_final_data_size();
627
628 // Write out the BND PLT data.
629 void
630 do_write(Output_file*);
631
632 // Offset of the Additional PLT (if using -z bndplt).
633 unsigned int aplt_offset_;
634
635 // The size of an entry in the PLT.
636 static const int plt_entry_size = 16;
637
638 // The size of an entry in the additional PLT.
639 static const int aplt_entry_size = 16;
640
641 // The first entry in the PLT.
642 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
643 // procedure linkage table for both programs and shared objects."
644 static const unsigned char first_plt_entry[plt_entry_size];
645
646 // Other entries in the PLT for an executable.
647 static const unsigned char plt_entry[plt_entry_size];
648
649 // Entries in the additional PLT.
650 static const unsigned char aplt_entry[aplt_entry_size];
651
652 // The reserved TLSDESC entry in the PLT for an executable.
653 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
654
655 // The .eh_frame unwind information for the PLT.
656 static const int plt_eh_frame_fde_size = 32;
657 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
658};
659
3a4f096e
ST		 660template<int size>
661class Lazy_view
662{
663 public:
664 Lazy_view(Sized_relobj_file<size, false>* object, unsigned int data_shndx)
665 : object_(object), data_shndx_(data_shndx), view_(NULL), view_size_(0)
666 { }
667
668 inline unsigned char
669 operator[](size_t offset)
670 {
671 if (this->view_ == NULL)
672 this->view_ = this->object_->section_contents(this->data_shndx_,
673 &this->view_size_,
674 true);
675 if (offset >= this->view_size_)
676 return 0;
677 return this->view_[offset];
678 }
679
680 private:
681 Sized_relobj_file<size, false>* object_;
682 unsigned int data_shndx_;
683 const unsigned char* view_;
684 section_size_type view_size_;
685};
686
2e30d253 687// The x86_64 target class.
d61c17ea
ILT		 688// See the ABI at
689// http://www.x86-64.org/documentation/abi.pdf
690// TLS info comes from
691// http://people.redhat.com/drepper/tls.pdf
0ffd9845 692// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
2e30d253 693
fc51264f
L		 694template<int size>
695class Target_x86_64 : public Sized_target<size, false>
2e30d253
ILT		 696{
697 public:
e822f2b1
ILT		 698 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
699 // uses only Elf64_Rela relocation entries with explicit addends."
fc51264f 700 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
2e30d253 701
2e702c99
RM		 702 Target_x86_64(const Target::Target_info* info = &x86_64_info)
703 : Sized_target<size, false>(info),
67181c72
ILT		 704 got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
705 got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
706 rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
43819297 707 got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
a2575bec 708 tls_base_symbol_defined_(false), isa_1_used_(0), isa_1_needed_(0),
a9fc784b
CC		 709 feature_1_(0), object_isa_1_used_(0), object_feature_1_(0),
710 seen_first_object_(false)
2e30d253
ILT		 711 { }
712
8a5e3e08
ILT		 713 // Hook for a new output section.
714 void
715 do_new_output_section(Output_section*) const;
716
6d03d481
ST		 717 // Scan the relocations to look for symbol adjustments.
718 void
ad0f2072 719 gc_process_relocs(Symbol_table* symtab,
2e702c99
RM		 720 Layout* layout,
721 Sized_relobj_file<size, false>* object,
722 unsigned int data_shndx,
723 unsigned int sh_type,
724 const unsigned char* prelocs,
725 size_t reloc_count,
726 Output_section* output_section,
727 bool needs_special_offset_handling,
728 size_t local_symbol_count,
729 const unsigned char* plocal_symbols);
6d03d481 730
2e30d253
ILT		 731 // Scan the relocations to look for symbol adjustments.
732 void
ad0f2072 733 scan_relocs(Symbol_table* symtab,
2e30d253 734 Layout* layout,
fc51264f 735 Sized_relobj_file<size, false>* object,
2e30d253
ILT		 736 unsigned int data_shndx,
737 unsigned int sh_type,
738 const unsigned char* prelocs,
739 size_t reloc_count,
730cdc88
ILT		 740 Output_section* output_section,
741 bool needs_special_offset_handling,
2e30d253 742 size_t local_symbol_count,
730cdc88 743 const unsigned char* plocal_symbols);
2e30d253
ILT		 744
745 // Finalize the sections.
746 void
f59f41f3 747 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2e30d253 748
4fb6c25d
ILT		 749 // Return the value to use for a dynamic which requires special
750 // treatment.
751 uint64_t
752 do_dynsym_value(const Symbol*) const;
753
2e30d253
ILT		 754 // Relocate a section.
755 void
fc51264f 756 relocate_section(const Relocate_info<size, false>*,
2e30d253
ILT		 757 unsigned int sh_type,
758 const unsigned char* prelocs,
759 size_t reloc_count,
730cdc88
ILT		 760 Output_section* output_section,
761 bool needs_special_offset_handling,
2e30d253 762 unsigned char* view,
fc51264f 763 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
364c7fa5
ILT		 764 section_size_type view_size,
765 const Reloc_symbol_changes*);
2e30d253 766
6a74a719
ILT		 767 // Scan the relocs during a relocatable link.
768 void
ad0f2072 769 scan_relocatable_relocs(Symbol_table* symtab,
6a74a719 770 Layout* layout,
fc51264f 771 Sized_relobj_file<size, false>* object,
6a74a719
ILT		 772 unsigned int data_shndx,
773 unsigned int sh_type,
774 const unsigned char* prelocs,
775 size_t reloc_count,
776 Output_section* output_section,
777 bool needs_special_offset_handling,
778 size_t local_symbol_count,
779 const unsigned char* plocal_symbols,
780 Relocatable_relocs*);
781
4d625b70
CC		 782 // Scan the relocs for --emit-relocs.
783 void
784 emit_relocs_scan(Symbol_table* symtab,
785 Layout* layout,
786 Sized_relobj_file<size, false>* object,
787 unsigned int data_shndx,
788 unsigned int sh_type,
789 const unsigned char* prelocs,
790 size_t reloc_count,
791 Output_section* output_section,
792 bool needs_special_offset_handling,
793 size_t local_symbol_count,
794 const unsigned char* plocal_syms,
795 Relocatable_relocs* rr);
796
7404fe1b 797 // Emit relocations for a section.
6a74a719 798 void
7404fe1b 799 relocate_relocs(
fc51264f
L		 800 const Relocate_info<size, false>*,
801 unsigned int sh_type,
802 const unsigned char* prelocs,
803 size_t reloc_count,
804 Output_section* output_section,
62fe925a 805 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
fc51264f
L		 806 unsigned char* view,
807 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
808 section_size_type view_size,
809 unsigned char* reloc_view,
810 section_size_type reloc_view_size);
6a74a719 811
2e30d253
ILT		 812 // Return a string used to fill a code section with nops.
813 std::string
8851ecca 814 do_code_fill(section_size_type length) const;
2e30d253 815
9a2d6984
ILT		 816 // Return whether SYM is defined by the ABI.
817 bool
9c2d0ef9 818 do_is_defined_by_abi(const Symbol* sym) const
9a2d6984
ILT		 819 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
820
e291e7b9
ILT		 821 // Return the symbol index to use for a target specific relocation.
822 // The only target specific relocation is R_X86_64_TLSDESC for a
823 // local symbol, which is an absolute reloc.
824 unsigned int
825 do_reloc_symbol_index(void*, unsigned int r_type) const
826 {
827 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
828 return 0;
829 }
830
831 // Return the addend to use for a target specific relocation.
832 uint64_t
833 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
834
7223e9ca 835 // Return the PLT section.
67181c72
ILT		 836 uint64_t
837 do_plt_address_for_global(const Symbol* gsym) const
838 { return this->plt_section()->address_for_global(gsym); }
7223e9ca 839
67181c72
ILT		 840 uint64_t
841 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
842 { return this->plt_section()->address_for_local(relobj, symndx); }
7223e9ca 843
b3ce541e
ILT		 844 // This function should be defined in targets that can use relocation
845 // types to determine (implemented in local_reloc_may_be_function_pointer
846 // and global_reloc_may_be_function_pointer)
847 // if a function's pointer is taken. ICF uses this in safe mode to only
848 // fold those functions whose pointer is defintely not taken. For x86_64
4aebb631
RC		 849 // pie binaries, safe ICF cannot be done by looking at only relocation
850 // types, and for certain cases (e.g. R_X86_64_PC32), the instruction
851 // opcode is checked as well to distinguish a function call from taking
852 // a function's pointer.
b3ce541e
ILT		 853 bool
854 do_can_check_for_function_pointers() const
4aebb631 855 { return true; }
b3ce541e 856
02d7cd44
ILT		 857 // Return the base for a DW_EH_PE_datarel encoding.
858 uint64_t
859 do_ehframe_datarel_base() const;
860
9b547ce6 861 // Adjust -fsplit-stack code which calls non-split-stack code.
364c7fa5
ILT		 862 void
863 do_calls_non_split(Relobj* object, unsigned int shndx,
864 section_offset_type fnoffset, section_size_type fnsize,
6e0813d3 865 const unsigned char* prelocs, size_t reloc_count,
364c7fa5
ILT		 866 unsigned char* view, section_size_type view_size,
867 std::string* from, std::string* to) const;
868
96f2030e 869 // Return the size of the GOT section.
fe8718a4 870 section_size_type
0e70b911 871 got_size() const
96f2030e
ILT		 872 {
873 gold_assert(this->got_ != NULL);
874 return this->got_->data_size();
875 }
876
0e70b911
CC		 877 // Return the number of entries in the GOT.
878 unsigned int
879 got_entry_count() const
880 {
881 if (this->got_ == NULL)
882 return 0;
883 return this->got_size() / 8;
884 }
885
886 // Return the number of entries in the PLT.
887 unsigned int
888 plt_entry_count() const;
889
890 // Return the offset of the first non-reserved PLT entry.
891 unsigned int
892 first_plt_entry_offset() const;
893
894 // Return the size of each PLT entry.
895 unsigned int
896 plt_entry_size() const;
897
41e83f2b
L		 898 // Return the size of each GOT entry.
899 unsigned int
900 got_entry_size() const
901 { return 8; };
902
4829d394 903 // Create the GOT section for an incremental update.
dd74ae06 904 Output_data_got_base*
4829d394
CC		 905 init_got_plt_for_update(Symbol_table* symtab,
906 Layout* layout,
907 unsigned int got_count,
908 unsigned int plt_count);
909
6fa2a40b
CC		 910 // Reserve a GOT entry for a local symbol, and regenerate any
911 // necessary dynamic relocations.
912 void
913 reserve_local_got_entry(unsigned int got_index,
2e702c99 914 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 915 unsigned int r_sym,
916 unsigned int got_type);
917
918 // Reserve a GOT entry for a global symbol, and regenerate any
919 // necessary dynamic relocations.
920 void
921 reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
922 unsigned int got_type);
923
4829d394 924 // Register an existing PLT entry for a global symbol.
4829d394 925 void
67181c72
ILT		 926 register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
927 Symbol* gsym);
4829d394 928
26d3c67d
CC		 929 // Force a COPY relocation for a given symbol.
930 void
931 emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
932
94a3fc8b
CC		 933 // Apply an incremental relocation.
934 void
fc51264f
L		 935 apply_relocation(const Relocate_info<size, false>* relinfo,
936 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 937 unsigned int r_type,
fc51264f 938 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 939 const Symbol* gsym,
940 unsigned char* view,
fc51264f 941 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 942 section_size_type view_size);
943
e291e7b9
ILT		 944 // Add a new reloc argument, returning the index in the vector.
945 size_t
fc51264f 946 add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
e291e7b9
ILT		 947 {
948 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
949 return this->tlsdesc_reloc_info_.size() - 1;
950 }
951
2e702c99
RM		 952 Output_data_plt_x86_64<size>*
953 make_data_plt(Layout* layout,
954 Output_data_got<64, false>* got,
57b2284c 955 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 956 Output_data_space* got_irelative)
957 {
958 return this->do_make_data_plt(layout, got, got_plt, got_irelative);
959 }
960
961 Output_data_plt_x86_64<size>*
962 make_data_plt(Layout* layout,
963 Output_data_got<64, false>* got,
57b2284c 964 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 965 Output_data_space* got_irelative,
966 unsigned int plt_count)
967 {
968 return this->do_make_data_plt(layout, got, got_plt, got_irelative,
969 plt_count);
970 }
971
972 virtual Output_data_plt_x86_64<size>*
973 do_make_data_plt(Layout* layout,
974 Output_data_got<64, false>* got,
57b2284c 975 Output_data_got_plt_x86_64* got_plt,
7a0c0a14 976 Output_data_space* got_irelative);
2e702c99
RM		 977
978 virtual Output_data_plt_x86_64<size>*
979 do_make_data_plt(Layout* layout,
980 Output_data_got<64, false>* got,
57b2284c 981 Output_data_got_plt_x86_64* got_plt,
2e702c99 982 Output_data_space* got_irelative,
7a0c0a14 983 unsigned int plt_count);
2e702c99 984
2e30d253
ILT		 985 private:
986 // The class which scans relocations.
a036edd8 987 class Scan
2e30d253 988 {
a036edd8
ILT		 989 public:
990 Scan()
991 : issued_non_pic_error_(false)
992 { }
993
95a2c8d6
RS		 994 static inline int
995 get_reference_flags(unsigned int r_type);
996
2e30d253 997 inline void
ad0f2072 998 local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 999 Sized_relobj_file<size, false>* object,
2e30d253 1000 unsigned int data_shndx,
07f397ab 1001 Output_section* output_section,
fc51264f 1002 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
bfdfa4cd
AM		 1003 const elfcpp::Sym<size, false>& lsym,
1004 bool is_discarded);
2e30d253
ILT		 1005
1006 inline void
ad0f2072 1007 global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 1008 Sized_relobj_file<size, false>* object,
2e30d253 1009 unsigned int data_shndx,
07f397ab 1010 Output_section* output_section,
fc51264f 1011 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
2e30d253 1012 Symbol* gsym);
e041f13d 1013
21bb3914
ST		 1014 inline bool
1015 local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
1016 Target_x86_64* target,
2e702c99
RM		 1017 Sized_relobj_file<size, false>* object,
1018 unsigned int data_shndx,
1019 Output_section* output_section,
1020 const elfcpp::Rela<size, false>& reloc,
21bb3914 1021 unsigned int r_type,
2e702c99 1022 const elfcpp::Sym<size, false>& lsym);
21bb3914
ST		 1023
1024 inline bool
1025 global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
2e702c99
RM		 1026 Target_x86_64* target,
1027 Sized_relobj_file<size, false>* object,
1028 unsigned int data_shndx,
1029 Output_section* output_section,
1030 const elfcpp::Rela<size, false>& reloc,
21bb3914 1031 unsigned int r_type,
2e702c99 1032 Symbol* gsym);
21bb3914 1033
a036edd8 1034 private:
e041f13d 1035 static void
fc51264f
L		 1036 unsupported_reloc_local(Sized_relobj_file<size, false>*,
1037 unsigned int r_type);
e041f13d
ILT		 1038
1039 static void
fc51264f
L		 1040 unsupported_reloc_global(Sized_relobj_file<size, false>*,
1041 unsigned int r_type, Symbol*);
a036edd8
ILT		 1042
1043 void
a29b0dad 1044 check_non_pic(Relobj*, unsigned int r_type, Symbol*);
a036edd8 1045
21bb3914 1046 inline bool
4aebb631
RC		 1047 possible_function_pointer_reloc(Sized_relobj_file<size, false>* src_obj,
1048 unsigned int src_indx,
1049 unsigned int r_offset,
1050 unsigned int r_type);
21bb3914 1051
7223e9ca 1052 bool
fc51264f 1053 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
6fa2a40b 1054 unsigned int r_type);
7223e9ca 1055
a036edd8
ILT		 1056 // Whether we have issued an error about a non-PIC compilation.
1057 bool issued_non_pic_error_;
2e30d253
ILT		 1058 };
1059
1060 // The class which implements relocation.
1061 class Relocate
1062 {
1063 public:
1064 Relocate()
36171d64 1065 : skip_call_tls_get_addr_(false)
2e30d253
ILT		 1066 { }
1067
1068 ~Relocate()
1069 {
1070 if (this->skip_call_tls_get_addr_)
1071 {
1072 // FIXME: This needs to specify the location somehow.
a0c4fb0a 1073 gold_error(_("missing expected TLS relocation"));
2e30d253
ILT		 1074 }
1075 }
1076
1077 // Do a relocation. Return false if the caller should not issue
1078 // any warnings about this relocation.
1079 inline bool
91a65d2f
AM		 1080 relocate(const Relocate_info<size, false>*, unsigned int,
1081 Target_x86_64*, Output_section*, size_t, const unsigned char*,
1082 const Sized_symbol<size>*, const Symbol_value<size>*,
fc51264f 1083 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 1084 section_size_type);
2e30d253
ILT		 1085
1086 private:
1087 // Do a TLS relocation.
1088 inline void
fc51264f 1089 relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
2e702c99 1090 size_t relnum, const elfcpp::Rela<size, false>&,
fc51264f
L		 1091 unsigned int r_type, const Sized_symbol<size>*,
1092 const Symbol_value<size>*,
1093 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 1094 section_size_type);
2e30d253 1095
c2b45e22 1096 // Do a TLS General-Dynamic to Initial-Exec transition.
7bf1f802 1097 inline void
fc51264f 1098 tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
fc51264f
L		 1099 const elfcpp::Rela<size, false>&, unsigned int r_type,
1100 typename elfcpp::Elf_types<size>::Elf_Addr value,
7bf1f802 1101 unsigned char* view,
fc51264f 1102 typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 1103 section_size_type view_size);
7bf1f802 1104
56622147
ILT		 1105 // Do a TLS General-Dynamic to Local-Exec transition.
1106 inline void
fc51264f 1107 tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 1108 Output_segment* tls_segment,
fc51264f
L		 1109 const elfcpp::Rela<size, false>&, unsigned int r_type,
1110 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 1111 unsigned char* view,
fe8718a4 1112 section_size_type view_size);
2e30d253 1113
c2b45e22
CC		 1114 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
1115 inline void
fc51264f 1116 tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
fc51264f
L		 1117 const elfcpp::Rela<size, false>&, unsigned int r_type,
1118 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 1119 unsigned char* view,
fc51264f 1120 typename elfcpp::Elf_types<size>::Elf_Addr,
c2b45e22
CC		 1121 section_size_type view_size);
1122
1123 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
1124 inline void
fc51264f 1125 tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
c2b45e22 1126 Output_segment* tls_segment,
fc51264f
L		 1127 const elfcpp::Rela<size, false>&, unsigned int r_type,
1128 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 1129 unsigned char* view,
1130 section_size_type view_size);
1131
56622147 1132 // Do a TLS Local-Dynamic to Local-Exec transition.
2e30d253 1133 inline void
fc51264f 1134 tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 1135 Output_segment* tls_segment,
fc51264f
L		 1136 const elfcpp::Rela<size, false>&, unsigned int r_type,
1137 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 1138 unsigned char* view,
fe8718a4 1139 section_size_type view_size);
2e30d253 1140
56622147
ILT		 1141 // Do a TLS Initial-Exec to Local-Exec transition.
1142 static inline void
fc51264f 1143 tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
72ec2876 1144 Output_segment* tls_segment,
fc51264f
L		 1145 const elfcpp::Rela<size, false>&, unsigned int r_type,
1146 typename elfcpp::Elf_types<size>::Elf_Addr value,
72ec2876 1147 unsigned char* view,
fe8718a4 1148 section_size_type view_size);
2e30d253
ILT		 1149
1150 // This is set if we should skip the next reloc, which should be a
1151 // PLT32 reloc against ___tls_get_addr.
1152 bool skip_call_tls_get_addr_;
1153 };
1154
1fa29f10
IT		 1155 // Check if relocation against this symbol is a candidate for
1156 // conversion from
1157 // mov foo@GOTPCREL(%rip), %reg
1158 // to lea foo(%rip), %reg.
3a4f096e
ST		 1159 template<class View_type>
1160 static inline bool
1161 can_convert_mov_to_lea(const Symbol* gsym, unsigned int r_type,
1162 size_t r_offset, View_type* view)
1fa29f10
IT		 1163 {
1164 gold_assert(gsym != NULL);
3a4f096e
ST		 1165 // We cannot do the conversion unless it's one of these relocations.
1166 if (r_type != elfcpp::R_X86_64_GOTPCREL
1167 && r_type != elfcpp::R_X86_64_GOTPCRELX
1168 && r_type != elfcpp::R_X86_64_REX_GOTPCRELX)
1169 return false;
1170 // We cannot convert references to IFUNC symbols, or to symbols that
1171 // are not local to the current module.
ed35cc4a
CC		 1172 // We can't do predefined symbols because they may become undefined
1173 // (e.g., __ehdr_start when the headers aren't mapped to a segment).
3a4f096e 1174 if (gsym->type() == elfcpp::STT_GNU_IFUNC
ed35cc4a
CC		 1175 || gsym->is_undefined()
1176 || gsym->is_predefined()
3a4f096e
ST		 1177 || gsym->is_from_dynobj()
1178 || gsym->is_preemptible())
1179 return false;
1180 // If we are building a shared object and the symbol is protected, we may
1181 // need to go through the GOT.
1182 if (parameters->options().shared()
1183 && gsym->visibility() == elfcpp::STV_PROTECTED)
1184 return false;
1185 // We cannot convert references to the _DYNAMIC symbol.
1186 if (strcmp(gsym->name(), "_DYNAMIC") == 0)
1187 return false;
1188 // Check for a MOV opcode.
1189 return (*view)[r_offset - 2] == 0x8b;
1190 }
1191
1192 // Convert
1193 // callq *foo@GOTPCRELX(%rip) to
1194 // addr32 callq foo
1195 // and jmpq *foo@GOTPCRELX(%rip) to
1196 // jmpq foo
1197 // nop
1198 template<class View_type>
1199 static inline bool
1200 can_convert_callq_to_direct(const Symbol* gsym, unsigned int r_type,
1201 size_t r_offset, View_type* view)
1202 {
1203 gold_assert(gsym != NULL);
1204 // We cannot do the conversion unless it's a GOTPCRELX relocation.
1205 if (r_type != elfcpp::R_X86_64_GOTPCRELX)
1206 return false;
1207 // We cannot convert references to IFUNC symbols, or to symbols that
1208 // are not local to the current module.
1209 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1210 || gsym->is_undefined ()
1211 || gsym->is_from_dynobj()
1212 || gsym->is_preemptible())
1213 return false;
1214 // Check for a CALLQ or JMPQ opcode.
1215 return ((*view)[r_offset - 2] == 0xff
1216 && ((*view)[r_offset - 1] == 0x15
1217 || (*view)[r_offset - 1] == 0x25));
1fa29f10
IT		 1218 }
1219
2e30d253
ILT		 1220 // Adjust TLS relocation type based on the options and whether this
1221 // is a local symbol.
e041f13d 1222 static tls::Tls_optimization
2e30d253
ILT		 1223 optimize_tls_reloc(bool is_final, int r_type);
1224
1225 // Get the GOT section, creating it if necessary.
1226 Output_data_got<64, false>*
1227 got_section(Symbol_table*, Layout*);
1228
96f2030e 1229 // Get the GOT PLT section.
57b2284c 1230 Output_data_got_plt_x86_64*
96f2030e
ILT		 1231 got_plt_section() const
1232 {
1233 gold_assert(this->got_plt_ != NULL);
1234 return this->got_plt_;
1235 }
1236
a8df5856
ILT		 1237 // Get the GOT section for TLSDESC entries.
1238 Output_data_got<64, false>*
1239 got_tlsdesc_section() const
1240 {
1241 gold_assert(this->got_tlsdesc_ != NULL);
1242 return this->got_tlsdesc_;
1243 }
1244
c2b45e22
CC		 1245 // Create the PLT section.
1246 void
1247 make_plt_section(Symbol_table* symtab, Layout* layout);
1248
2e30d253
ILT		 1249 // Create a PLT entry for a global symbol.
1250 void
1251 make_plt_entry(Symbol_table*, Layout*, Symbol*);
1252
7223e9ca
ILT		 1253 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
1254 void
1255 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
fc51264f 1256 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 1257 unsigned int local_sym_index);
1258
9fa33bee 1259 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 1260 void
1261 define_tls_base_symbol(Symbol_table*, Layout*);
1262
c2b45e22
CC		 1263 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
1264 void
1265 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
1266
31d60480
ILT		 1267 // Create a GOT entry for the TLS module index.
1268 unsigned int
1269 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
fc51264f 1270 Sized_relobj_file<size, false>* object);
31d60480 1271
2e30d253 1272 // Get the PLT section.
fc51264f 1273 Output_data_plt_x86_64<size>*
2e30d253
ILT		 1274 plt_section() const
1275 {
1276 gold_assert(this->plt_ != NULL);
1277 return this->plt_;
1278 }
1279
1280 // Get the dynamic reloc section, creating it if necessary.
1281 Reloc_section*
0ffd9845 1282 rela_dyn_section(Layout*);
2e30d253 1283
e291e7b9
ILT		 1284 // Get the section to use for TLSDESC relocations.
1285 Reloc_section*
1286 rela_tlsdesc_section(Layout*) const;
1287
67181c72
ILT		 1288 // Get the section to use for IRELATIVE relocations.
1289 Reloc_section*
1290 rela_irelative_section(Layout*);
1291
12c0daef 1292 // Add a potential copy relocation.
2e30d253 1293 void
ef9beddf 1294 copy_reloc(Symbol_table* symtab, Layout* layout,
2e702c99 1295 Sized_relobj_file<size, false>* object,
12c0daef 1296 unsigned int shndx, Output_section* output_section,
fc51264f 1297 Symbol* sym, const elfcpp::Rela<size, false>& reloc)
12c0daef 1298 {
859d7987 1299 unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
12c0daef 1300 this->copy_relocs_.copy_reloc(symtab, layout,
fc51264f 1301 symtab->get_sized_symbol<size>(sym),
12c0daef 1302 object, shndx, output_section,
859d7987
CC		 1303 r_type, reloc.get_r_offset(),
1304 reloc.get_r_addend(),
1305 this->rela_dyn_section(layout));
12c0daef 1306 }
2e30d253 1307
a2575bec 1308 // Record a target-specific program property in the .note.gnu.property
6c04fd9b
CC		 1309 // section.
1310 void
dc1f2887
CC		 1311 record_gnu_property(unsigned int, unsigned int, size_t,
1312 const unsigned char*, const Object*);
a2575bec
CC		 1313
1314 // Merge the target-specific program properties from the current object.
1315 void
1316 merge_gnu_properties(const Object*);
1317
1318 // Finalize the target-specific program properties and add them back to
1319 // the layout.
1320 void
1321 do_finalize_gnu_properties(Layout*) const;
6c04fd9b 1322
2e30d253
ILT		 1323 // Information about this specific target which we pass to the
1324 // general Target structure.
1325 static const Target::Target_info x86_64_info;
1326
0e70b911
CC		 1327 // The types of GOT entries needed for this platform.
1328 // These values are exposed to the ABI in an incremental link.
1329 // Do not renumber existing values without changing the version
1330 // number of the .gnu_incremental_inputs section.
0a65a3a7
CC		 1331 enum Got_type
1332 {
1333 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
1334 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
1335 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
1336 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
1337 };
1338
e291e7b9
ILT		 1339 // This type is used as the argument to the target specific
1340 // relocation routines. The only target specific reloc is
1341 // R_X86_64_TLSDESC against a local symbol.
1342 struct Tlsdesc_info
1343 {
fc51264f 1344 Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
e291e7b9
ILT		 1345 : object(a_object), r_sym(a_r_sym)
1346 { }
1347
1348 // The object in which the local symbol is defined.
fc51264f 1349 Sized_relobj_file<size, false>* object;
e291e7b9
ILT		 1350 // The local symbol index in the object.
1351 unsigned int r_sym;
1352 };
1353
2e30d253
ILT		 1354 // The GOT section.
1355 Output_data_got<64, false>* got_;
1356 // The PLT section.
fc51264f 1357 Output_data_plt_x86_64<size>* plt_;
2e30d253 1358 // The GOT PLT section.
57b2284c 1359 Output_data_got_plt_x86_64* got_plt_;
67181c72
ILT		 1360 // The GOT section for IRELATIVE relocations.
1361 Output_data_space* got_irelative_;
a8df5856
ILT		 1362 // The GOT section for TLSDESC relocations.
1363 Output_data_got<64, false>* got_tlsdesc_;
e785ec03
ILT		 1364 // The _GLOBAL_OFFSET_TABLE_ symbol.
1365 Symbol* global_offset_table_;
2e30d253 1366 // The dynamic reloc section.
0ffd9845 1367 Reloc_section* rela_dyn_;
67181c72
ILT		 1368 // The section to use for IRELATIVE relocs.
1369 Reloc_section* rela_irelative_;
2e30d253 1370 // Relocs saved to avoid a COPY reloc.
fc51264f 1371 Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
c2b45e22 1372 // Offset of the GOT entry for the TLS module index.
31d60480 1373 unsigned int got_mod_index_offset_;
e291e7b9
ILT		 1374 // We handle R_X86_64_TLSDESC against a local symbol as a target
1375 // specific relocation. Here we store the object and local symbol
1376 // index for the relocation.
1377 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
edfbb029
CC		 1378 // True if the _TLS_MODULE_BASE_ symbol has been defined.
1379 bool tls_base_symbol_defined_;
a2575bec
CC		 1380 // Target-specific program properties, from .note.gnu.property section.
1381 // Each bit represents a specific feature.
1382 uint32_t isa_1_used_;
1383 uint32_t isa_1_needed_;
1384 uint32_t feature_1_;
1385 // Target-specific properties from the current object.
a9fc784b
CC		 1386 // These bits get ORed into ISA_1_USED_ after all properties for the object
1387 // have been processed. But if either is all zeroes (as when the property
1388 // is absent from an object), the result should be all zeroes.
1389 // (See PR ld/23486.)
1390 uint32_t object_isa_1_used_;
a2575bec
CC		 1391 // These bits get ANDed into FEATURE_1_ after all properties for the object
1392 // have been processed.
1393 uint32_t object_feature_1_;
1394 // Whether we have seen our first object, for use in initializing FEATURE_1_.
1395 bool seen_first_object_;
2e30d253
ILT		 1396};
1397
fc51264f
L		 1398template<>
1399const Target::Target_info Target_x86_64<64>::x86_64_info =
2e30d253
ILT		 1400{
1401 64, // size
1402 false, // is_big_endian
1403 elfcpp::EM_X86_64, // machine_code
1404 false, // has_make_symbol
1405 false, // has_resolve
1406 true, // has_code_fill
35cdfc9a 1407 true, // is_default_stack_executable
b3ce541e 1408 true, // can_icf_inline_merge_sections
0864d551 1409 '\0', // wrap_char
2e30d253 1410 "/lib/ld64.so.1", // program interpreter
0c5e9c22 1411 0x400000, // default_text_segment_address
cd72c291 1412 0x1000, // abi_pagesize (overridable by -z max-page-size)
8a5e3e08 1413 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1414 false, // isolate_execinstr
1415 0, // rosegment_gap
8a5e3e08
ILT		 1416 elfcpp::SHN_UNDEF, // small_common_shndx
1417 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1418 0, // small_common_section_flags
05a352e6
DK		 1419 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1420 NULL, // attributes_section
a67858e0 1421 NULL, // attributes_vendor
8d9743bd
MK		 1422 "_start", // entry_symbol_name
1423 32, // hash_entry_size
bce5a025 1424 elfcpp::SHT_X86_64_UNWIND, // unwind_section_type
2e30d253
ILT		 1425};
1426
fc51264f
L		 1427template<>
1428const Target::Target_info Target_x86_64<32>::x86_64_info =
1429{
1430 32, // size
1431 false, // is_big_endian
1432 elfcpp::EM_X86_64, // machine_code
1433 false, // has_make_symbol
1434 false, // has_resolve
1435 true, // has_code_fill
1436 true, // is_default_stack_executable
1437 true, // can_icf_inline_merge_sections
1438 '\0', // wrap_char
1439 "/libx32/ldx32.so.1", // program interpreter
1440 0x400000, // default_text_segment_address
1441 0x1000, // abi_pagesize (overridable by -z max-page-size)
1442 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1443 false, // isolate_execinstr
1444 0, // rosegment_gap
fc51264f
L		 1445 elfcpp::SHN_UNDEF, // small_common_shndx
1446 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1447 0, // small_common_section_flags
1448 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1449 NULL, // attributes_section
a67858e0 1450 NULL, // attributes_vendor
8d9743bd
MK		 1451 "_start", // entry_symbol_name
1452 32, // hash_entry_size
bce5a025 1453 elfcpp::SHT_X86_64_UNWIND, // unwind_section_type
fc51264f
L		 1454};
1455
8a5e3e08
ILT		 1456// This is called when a new output section is created. This is where
1457// we handle the SHF_X86_64_LARGE.
1458
fc51264f 1459template<int size>
8a5e3e08 1460void
fc51264f 1461Target_x86_64<size>::do_new_output_section(Output_section* os) const
8a5e3e08
ILT		 1462{
1463 if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1464 os->set_is_large_section();
1465}
1466
2e30d253
ILT		 1467// Get the GOT section, creating it if necessary.
1468
fc51264f 1469template<int size>
2e30d253 1470Output_data_got<64, false>*
fc51264f 1471Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
2e30d253
ILT		 1472{
1473 if (this->got_ == NULL)
1474 {
1475 gold_assert(symtab != NULL && layout != NULL);
1476
9446efde
ILT		 1477 // When using -z now, we can treat .got.plt as a relro section.
1478 // Without -z now, it is modified after program startup by lazy
1479 // PLT relocations.
1480 bool is_got_plt_relro = parameters->options().now();
1481 Output_section_order got_order = (is_got_plt_relro
1482 ? ORDER_RELRO
1483 : ORDER_RELRO_LAST);
1484 Output_section_order got_plt_order = (is_got_plt_relro
1485 ? ORDER_RELRO
1486 : ORDER_NON_RELRO_FIRST);
1487
2e30d253
ILT		 1488 this->got_ = new Output_data_got<64, false>();
1489
82742395
ILT		 1490 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1491 (elfcpp::SHF_ALLOC
1492 | elfcpp::SHF_WRITE),
9446efde 1493 this->got_, got_order, true);
2e30d253 1494
57b2284c 1495 this->got_plt_ = new Output_data_got_plt_x86_64(layout);
82742395
ILT		 1496 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1497 (elfcpp::SHF_ALLOC
1498 | elfcpp::SHF_WRITE),
9446efde
ILT		 1499 this->got_plt_, got_plt_order,
1500 is_got_plt_relro);
2e30d253
ILT		 1501
1502 // The first three entries are reserved.
27bc2bce 1503 this->got_plt_->set_current_data_size(3 * 8);
2e30d253 1504
9446efde
ILT		 1505 if (!is_got_plt_relro)
1506 {
1507 // Those bytes can go into the relro segment.
1508 layout->increase_relro(3 * 8);
1509 }
1a2dff53 1510
2e30d253 1511 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
e785ec03
ILT		 1512 this->global_offset_table_ =
1513 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1514 Symbol_table::PREDEFINED,
1515 this->got_plt_,
1516 0, 0, elfcpp::STT_OBJECT,
1517 elfcpp::STB_LOCAL,
1518 elfcpp::STV_HIDDEN, 0,
1519 false, false);
a8df5856 1520
67181c72
ILT		 1521 // If there are any IRELATIVE relocations, they get GOT entries
1522 // in .got.plt after the jump slot entries.
1523 this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1524 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1525 (elfcpp::SHF_ALLOC
1526 | elfcpp::SHF_WRITE),
1527 this->got_irelative_,
9446efde 1528 got_plt_order, is_got_plt_relro);
67181c72 1529
a8df5856 1530 // If there are any TLSDESC relocations, they get GOT entries in
67181c72 1531 // .got.plt after the jump slot and IRELATIVE entries.
a8df5856
ILT		 1532 this->got_tlsdesc_ = new Output_data_got<64, false>();
1533 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1534 (elfcpp::SHF_ALLOC
1535 | elfcpp::SHF_WRITE),
22f0da72 1536 this->got_tlsdesc_,
9446efde 1537 got_plt_order, is_got_plt_relro);
2e30d253
ILT		 1538 }
1539
1540 return this->got_;
1541}
1542
1543// Get the dynamic reloc section, creating it if necessary.
1544
fc51264f
L		 1545template<int size>
1546typename Target_x86_64<size>::Reloc_section*
1547Target_x86_64<size>::rela_dyn_section(Layout* layout)
2e30d253 1548{
0ffd9845 1549 if (this->rela_dyn_ == NULL)
2e30d253
ILT		 1550 {
1551 gold_assert(layout != NULL);
d98bc257 1552 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
2e30d253 1553 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
22f0da72
ILT		 1554 elfcpp::SHF_ALLOC, this->rela_dyn_,
1555 ORDER_DYNAMIC_RELOCS, false);
2e30d253 1556 }
0ffd9845 1557 return this->rela_dyn_;
2e30d253
ILT		 1558}
1559
67181c72
ILT		 1560// Get the section to use for IRELATIVE relocs, creating it if
1561// necessary. These go in .rela.dyn, but only after all other dynamic
1562// relocations. They need to follow the other dynamic relocations so
1563// that they can refer to global variables initialized by those
1564// relocs.
1565
fc51264f
L		 1566template<int size>
1567typename Target_x86_64<size>::Reloc_section*
1568Target_x86_64<size>::rela_irelative_section(Layout* layout)
67181c72
ILT		 1569{
1570 if (this->rela_irelative_ == NULL)
1571 {
1572 // Make sure we have already created the dynamic reloc section.
1573 this->rela_dyn_section(layout);
1574 this->rela_irelative_ = new Reloc_section(false);
1575 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1576 elfcpp::SHF_ALLOC, this->rela_irelative_,
1577 ORDER_DYNAMIC_RELOCS, false);
1578 gold_assert(this->rela_dyn_->output_section()
1579 == this->rela_irelative_->output_section());
1580 }
1581 return this->rela_irelative_;
1582}
1583
a2575bec 1584// Record a target-specific program property from the .note.gnu.property
6c04fd9b
CC		 1585// section.
1586template<int size>
1587void
a2575bec 1588Target_x86_64<size>::record_gnu_property(
dc1f2887 1589 unsigned int, unsigned int pr_type,
a2575bec
CC		 1590 size_t pr_datasz, const unsigned char* pr_data,
1591 const Object* object)
6c04fd9b 1592{
add41311 1593 uint32_t val = 0;
a2575bec 1594
6c04fd9b
CC		 1595 switch (pr_type)
1596 {
1597 case elfcpp::GNU_PROPERTY_X86_ISA_1_USED:
1598 case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED:
6c04fd9b 1599 case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND:
a2575bec
CC		 1600 if (pr_datasz != 4)
1601 {
1602 gold_warning(_("%s: corrupt .note.gnu.property section "
1603 "(pr_datasz for property %d is not 4)"),
1604 object->name().c_str(), pr_type);
1605 return;
1606 }
1607 val = elfcpp::Swap<32, false>::readval(pr_data);
6c04fd9b
CC		 1608 break;
1609 default:
a2575bec
CC		 1610 gold_warning(_("%s: unknown program property type 0x%x "
1611 "in .note.gnu.property section"),
1612 object->name().c_str(), pr_type);
6c04fd9b
CC		 1613 break;
1614 }
a2575bec
CC		 1615
1616 switch (pr_type)
1617 {
1618 case elfcpp::GNU_PROPERTY_X86_ISA_1_USED:
a9fc784b 1619 this->object_isa_1_used_ |= val;
a2575bec
CC		 1620 break;
1621 case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED:
1622 this->isa_1_needed_ |= val;
1623 break;
1624 case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND:
1625 // If we see multiple feature props in one object, OR them together.
1626 this->object_feature_1_ |= val;
1627 break;
1628 }
1629}
1630
1631// Merge the target-specific program properties from the current object.
1632template<int size>
1633void
1634Target_x86_64<size>::merge_gnu_properties(const Object*)
1635{
1636 if (this->seen_first_object_)
a9fc784b
CC		 1637 {
1638 // If any object is missing the ISA_1_USED property, we must omit
1639 // it from the output file.
1640 if (this->object_isa_1_used_ == 0)
1641 this->isa_1_used_ = 0;
1642 else if (this->isa_1_used_ != 0)
1643 this->isa_1_used_ |= this->object_isa_1_used_;
1644 this->feature_1_ &= this->object_feature_1_;
1645 }
a2575bec
CC		 1646 else
1647 {
a9fc784b 1648 this->isa_1_used_ = this->object_isa_1_used_;
a2575bec
CC		 1649 this->feature_1_ = this->object_feature_1_;
1650 this->seen_first_object_ = true;
1651 }
a9fc784b 1652 this->object_isa_1_used_ = 0;
a2575bec
CC		 1653 this->object_feature_1_ = 0;
1654}
1655
1656static inline void
1657add_property(Layout* layout, unsigned int pr_type, uint32_t val)
1658{
1659 unsigned char buf[4];
1660 elfcpp::Swap<32, false>::writeval(buf, val);
1661 layout->add_gnu_property(elfcpp::NT_GNU_PROPERTY_TYPE_0, pr_type, 4, buf);
1662}
1663
1664// Finalize the target-specific program properties and add them back to
1665// the layout.
1666template<int size>
1667void
1668Target_x86_64<size>::do_finalize_gnu_properties(Layout* layout) const
1669{
1670 if (this->isa_1_used_ != 0)
1671 add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_USED,
1672 this->isa_1_used_);
1673 if (this->isa_1_needed_ != 0)
1674 add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED,
1675 this->isa_1_needed_);
1676 if (this->feature_1_ != 0)
1677 add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND,
1678 this->feature_1_);
6c04fd9b
CC		 1679}
1680
57b2284c
CC		 1681// Write the first three reserved words of the .got.plt section.
1682// The remainder of the section is written while writing the PLT
1683// in Output_data_plt_i386::do_write.
1684
1685void
1686Output_data_got_plt_x86_64::do_write(Output_file* of)
1687{
1688 // The first entry in the GOT is the address of the .dynamic section
1689 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1690 // We saved space for them when we created the section in
1691 // Target_x86_64::got_section.
1692 const off_t got_file_offset = this->offset();
1693 gold_assert(this->data_size() >= 24);
1694 unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
1695 Output_section* dynamic = this->layout_->dynamic_section();
1696 uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1697 elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
1698 memset(got_view + 8, 0, 16);
1699 of->write_output_view(got_file_offset, 24, got_view);
1700}
1701
4829d394 1702// Initialize the PLT section.
2e30d253 1703
fc51264f 1704template<int size>
4829d394 1705void
fc51264f 1706Output_data_plt_x86_64<size>::init(Layout* layout)
2e30d253 1707{
d98bc257 1708 this->rel_ = new Reloc_section(false);
2e30d253 1709 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
22f0da72
ILT		 1710 elfcpp::SHF_ALLOC, this->rel_,
1711 ORDER_DYNAMIC_PLT_RELOCS, false);
2e30d253
ILT		 1712}
1713
fc51264f 1714template<int size>
2e30d253 1715void
fc51264f 1716Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
2e30d253 1717{
2e702c99 1718 os->set_entsize(this->get_plt_entry_size());
2e30d253
ILT		 1719}
1720
1721// Add an entry to the PLT.
1722
fc51264f 1723template<int size>
2e30d253 1724void
fc51264f
L		 1725Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1726 Symbol* gsym)
2e30d253
ILT		 1727{
1728 gold_assert(!gsym->has_plt_offset());
1729
4829d394
CC		 1730 unsigned int plt_index;
1731 off_t plt_offset;
1732 section_offset_type got_offset;
2e30d253 1733
67181c72
ILT		 1734 unsigned int* pcount;
1735 unsigned int offset;
1736 unsigned int reserved;
57b2284c 1737 Output_section_data_build* got;
67181c72
ILT		 1738 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1739 && gsym->can_use_relative_reloc(false))
1740 {
1741 pcount = &this->irelative_count_;
1742 offset = 0;
1743 reserved = 0;
1744 got = this->got_irelative_;
1745 }
1746 else
1747 {
1748 pcount = &this->count_;
1749 offset = 1;
1750 reserved = 3;
1751 got = this->got_plt_;
1752 }
1753
4829d394
CC		 1754 if (!this->is_data_size_valid())
1755 {
67181c72
ILT		 1756 // Note that when setting the PLT offset for a non-IRELATIVE
1757 // entry we skip the initial reserved PLT entry.
1758 plt_index = *pcount + offset;
2e702c99 1759 plt_offset = plt_index * this->get_plt_entry_size();
2e30d253 1760
67181c72 1761 ++*pcount;
2e30d253 1762
67181c72
ILT		 1763 got_offset = (plt_index - offset + reserved) * 8;
1764 gold_assert(got_offset == got->current_data_size());
2e30d253 1765
4829d394
CC		 1766 // Every PLT entry needs a GOT entry which points back to the PLT
1767 // entry (this will be changed by the dynamic linker, normally
1768 // lazily when the function is called).
67181c72 1769 got->set_current_data_size(got_offset + 8);
4829d394 1770 }
7223e9ca
ILT		 1771 else
1772 {
67181c72
ILT		 1773 // FIXME: This is probably not correct for IRELATIVE relocs.
1774
4829d394 1775 // For incremental updates, find an available slot.
2e702c99
RM		 1776 plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1777 this->get_plt_entry_size(), 0);
4829d394 1778 if (plt_offset == -1)
e6455dfb
CC		 1779 gold_fallback(_("out of patch space (PLT);"
1780 " relink with --incremental-full"));
4829d394
CC		 1781
1782 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1783 // can be calculated from the PLT index, adjusting for the three
1784 // reserved entries at the beginning of the GOT.
2e702c99 1785 plt_index = plt_offset / this->get_plt_entry_size() - 1;
67181c72 1786 got_offset = (plt_index - offset + reserved) * 8;
7223e9ca 1787 }
2e30d253 1788
4829d394
CC		 1789 gsym->set_plt_offset(plt_offset);
1790
1791 // Every PLT entry needs a reloc.
67181c72 1792 this->add_relocation(symtab, layout, gsym, got_offset);
4829d394 1793
2e30d253
ILT		 1794 // Note that we don't need to save the symbol. The contents of the
1795 // PLT are independent of which symbols are used. The symbols only
1796 // appear in the relocations.
1797}
1798
7223e9ca
ILT		 1799// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1800// the PLT offset.
1801
fc51264f 1802template<int size>
7223e9ca 1803unsigned int
fc51264f 1804Output_data_plt_x86_64<size>::add_local_ifunc_entry(
67181c72
ILT		 1805 Symbol_table* symtab,
1806 Layout* layout,
fc51264f 1807 Sized_relobj_file<size, false>* relobj,
6fa2a40b 1808 unsigned int local_sym_index)
7223e9ca 1809{
2e702c99 1810 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
67181c72 1811 ++this->irelative_count_;
7223e9ca 1812
67181c72 1813 section_offset_type got_offset = this->got_irelative_->current_data_size();
7223e9ca
ILT		 1814
1815 // Every PLT entry needs a GOT entry which points back to the PLT
1816 // entry.
67181c72 1817 this->got_irelative_->set_current_data_size(got_offset + 8);
7223e9ca
ILT		 1818
1819 // Every PLT entry needs a reloc.
67181c72
ILT		 1820 Reloc_section* rela = this->rela_irelative(symtab, layout);
1821 rela->add_symbolless_local_addend(relobj, local_sym_index,
1822 elfcpp::R_X86_64_IRELATIVE,
1823 this->got_irelative_, got_offset, 0);
7223e9ca
ILT		 1824
1825 return plt_offset;
1826}
1827
4829d394
CC		 1828// Add the relocation for a PLT entry.
1829
fc51264f 1830template<int size>
4829d394 1831void
fc51264f
L		 1832Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1833 Layout* layout,
1834 Symbol* gsym,
1835 unsigned int got_offset)
4829d394
CC		 1836{
1837 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1838 && gsym->can_use_relative_reloc(false))
67181c72
ILT		 1839 {
1840 Reloc_section* rela = this->rela_irelative(symtab, layout);
1841 rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1842 this->got_irelative_, got_offset, 0);
1843 }
4829d394
CC		 1844 else
1845 {
1846 gsym->set_needs_dynsym_entry();
1847 this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1848 got_offset, 0);
1849 }
1850}
1851
e291e7b9
ILT		 1852// Return where the TLSDESC relocations should go, creating it if
1853// necessary. These follow the JUMP_SLOT relocations.
1854
fc51264f
L		 1855template<int size>
1856typename Output_data_plt_x86_64<size>::Reloc_section*
1857Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
e291e7b9
ILT		 1858{
1859 if (this->tlsdesc_rel_ == NULL)
1860 {
1861 this->tlsdesc_rel_ = new Reloc_section(false);
1862 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1863 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
22f0da72 1864 ORDER_DYNAMIC_PLT_RELOCS, false);
67181c72
ILT		 1865 gold_assert(this->tlsdesc_rel_->output_section()
1866 == this->rel_->output_section());
e291e7b9
ILT		 1867 }
1868 return this->tlsdesc_rel_;
1869}
1870
67181c72
ILT		 1871// Return where the IRELATIVE relocations should go in the PLT. These
1872// follow the JUMP_SLOT and the TLSDESC relocations.
1873
fc51264f
L		 1874template<int size>
1875typename Output_data_plt_x86_64<size>::Reloc_section*
1876Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1877 Layout* layout)
67181c72
ILT		 1878{
1879 if (this->irelative_rel_ == NULL)
1880 {
1881 // Make sure we have a place for the TLSDESC relocations, in
1882 // case we see any later on.
1883 this->rela_tlsdesc(layout);
1884 this->irelative_rel_ = new Reloc_section(false);
1885 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1886 elfcpp::SHF_ALLOC, this->irelative_rel_,
1887 ORDER_DYNAMIC_PLT_RELOCS, false);
1888 gold_assert(this->irelative_rel_->output_section()
1889 == this->rel_->output_section());
1890
1891 if (parameters->doing_static_link())
1892 {
1893 // A statically linked executable will only have a .rela.plt
1894 // section to hold R_X86_64_IRELATIVE relocs for
1895 // STT_GNU_IFUNC symbols. The library will use these
1896 // symbols to locate the IRELATIVE relocs at program startup
1897 // time.
1898 symtab->define_in_output_data("__rela_iplt_start", NULL,
1899 Symbol_table::PREDEFINED,
1900 this->irelative_rel_, 0, 0,
1901 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1902 elfcpp::STV_HIDDEN, 0, false, true);
1903 symtab->define_in_output_data("__rela_iplt_end", NULL,
1904 Symbol_table::PREDEFINED,
1905 this->irelative_rel_, 0, 0,
1906 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1907 elfcpp::STV_HIDDEN, 0, true, true);
1908 }
1909 }
1910 return this->irelative_rel_;
1911}
1912
1913// Return the PLT address to use for a global symbol.
1914
fc51264f 1915template<int size>
67181c72 1916uint64_t
7a0c0a14 1917Output_data_plt_x86_64<size>::do_address_for_global(const Symbol* gsym)
67181c72
ILT		 1918{
1919 uint64_t offset = 0;
1920 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1921 && gsym->can_use_relative_reloc(false))
2e702c99 1922 offset = (this->count_ + 1) * this->get_plt_entry_size();
19fec8c1 1923 return this->address() + offset + gsym->plt_offset();
67181c72
ILT		 1924}
1925
1926// Return the PLT address to use for a local symbol. These are always
1927// IRELATIVE relocs.
1928
fc51264f 1929template<int size>
67181c72 1930uint64_t
7a0c0a14
CC		 1931Output_data_plt_x86_64<size>::do_address_for_local(const Relobj* object,
1932 unsigned int r_sym)
67181c72 1933{
19fec8c1
AM		 1934 return (this->address()
1935 + (this->count_ + 1) * this->get_plt_entry_size()
1936 + object->local_plt_offset(r_sym));
67181c72
ILT		 1937}
1938
c2b45e22 1939// Set the final size.
fc51264f 1940template<int size>
c2b45e22 1941void
fc51264f 1942Output_data_plt_x86_64<size>::set_final_data_size()
c2b45e22 1943{
7a0c0a14
CC		 1944 // Number of regular and IFUNC PLT entries, plus the first entry.
1945 unsigned int count = this->count_ + this->irelative_count_ + 1;
1946 // Count the TLSDESC entry, if present.
c2b45e22
CC		 1947 if (this->has_tlsdesc_entry())
1948 ++count;
7a0c0a14 1949 this->set_data_size(count * this->get_plt_entry_size());
c2b45e22
CC		 1950}
1951
2e30d253
ILT		 1952// The first entry in the PLT for an executable.
1953
fc51264f
L		 1954template<int size>
1955const unsigned char
2e702c99 1956Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
2e30d253
ILT		 1957{
1958 // From AMD64 ABI Draft 0.98, page 76
1959 0xff, 0x35, // pushq contents of memory address
2e30d253 1960 0, 0, 0, 0, // replaced with address of .got + 8
78d911fd
ILT		 1961 0xff, 0x25, // jmp indirect
1962 0, 0, 0, 0, // replaced with address of .got + 16
2e30d253
ILT		 1963 0x90, 0x90, 0x90, 0x90 // noop (x4)
1964};
1965
2e702c99
RM		 1966template<int size>
1967void
1968Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1969 unsigned char* pov,
1970 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1971 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1972{
1973 memcpy(pov, first_plt_entry, plt_entry_size);
1974 // We do a jmp relative to the PC at the end of this instruction.
1975 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1976 (got_address + 8
1977 - (plt_address + 6)));
1978 elfcpp::Swap<32, false>::writeval(pov + 8,
1979 (got_address + 16
1980 - (plt_address + 12)));
1981}
1982
2e30d253
ILT		 1983// Subsequent entries in the PLT for an executable.
1984
fc51264f
L		 1985template<int size>
1986const unsigned char
2e702c99 1987Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
2e30d253
ILT		 1988{
1989 // From AMD64 ABI Draft 0.98, page 76
1990 0xff, 0x25, // jmpq indirect
1991 0, 0, 0, 0, // replaced with address of symbol in .got
1992 0x68, // pushq immediate
1993 0, 0, 0, 0, // replaced with offset into relocation table
1994 0xe9, // jmpq relative
1995 0, 0, 0, 0 // replaced with offset to start of .plt
1996};
1997
2e702c99
RM		 1998template<int size>
1999unsigned int
2000Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
2001 unsigned char* pov,
2002 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2003 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
2004 unsigned int got_offset,
2005 unsigned int plt_offset,
2006 unsigned int plt_index)
2007{
9d585188
L		 2008 // Check PC-relative offset overflow in PLT entry.
2009 uint64_t plt_got_pcrel_offset = (got_address + got_offset
2010 - (plt_address + plt_offset + 6));
2011 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
2012 gold_error(_("PC-relative offset overflow in PLT entry %d"),
2013 plt_index + 1);
2014
2e702c99
RM		 2015 memcpy(pov, plt_entry, plt_entry_size);
2016 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
9d585188 2017 plt_got_pcrel_offset);
2e702c99
RM		 2018
2019 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
2020 elfcpp::Swap<32, false>::writeval(pov + 12,
2021 - (plt_offset + plt_entry_size));
2022
2023 return 6;
2024}
2025
c2b45e22
CC		 2026// The reserved TLSDESC entry in the PLT for an executable.
2027
fc51264f
L		 2028template<int size>
2029const unsigned char
2e702c99 2030Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
c2b45e22
CC		 2031{
2032 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
2033 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
2034 0xff, 0x35, // pushq x(%rip)
2035 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
2036 0xff, 0x25, // jmpq *y(%rip)
2037 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
2038 0x0f, 0x1f, // nop
2039 0x40, 0
2040};
2041
2e702c99
RM		 2042template<int size>
2043void
2044Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
2045 unsigned char* pov,
2046 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2047 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
2048 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
2049 unsigned int tlsdesc_got_offset,
2050 unsigned int plt_offset)
2051{
2052 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
2053 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2054 (got_address + 8
2055 - (plt_address + plt_offset
2056 + 6)));
2057 elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
2058 (got_base
2059 + tlsdesc_got_offset
2060 - (plt_address + plt_offset
2061 + 12)));
2062}
2063
7a0c0a14
CC		 2064// Return the APLT address to use for a global symbol (for -z bndplt).
2065
2066uint64_t
2067Output_data_plt_x86_64_bnd::do_address_for_global(const Symbol* gsym)
2068{
2069 uint64_t offset = this->aplt_offset_;
2070 // Convert the PLT offset into an APLT offset.
2071 unsigned int plt_offset = gsym->plt_offset();
2072 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2073 && gsym->can_use_relative_reloc(false))
2074 offset += this->regular_count() * aplt_entry_size;
2075 else
2076 plt_offset -= plt_entry_size;
2077 plt_offset = plt_offset / (plt_entry_size / aplt_entry_size);
2078 return this->address() + offset + plt_offset;
2079}
2080
2081// Return the PLT address to use for a local symbol. These are always
2082// IRELATIVE relocs.
2083
2084uint64_t
2085Output_data_plt_x86_64_bnd::do_address_for_local(const Relobj* object,
2086 unsigned int r_sym)
2087{
2088 // Convert the PLT offset into an APLT offset.
e977e747
L		 2089 const Sized_relobj_file<64, false>* sized_relobj =
2090 static_cast<const Sized_relobj_file<64, false>*>(object);
2091 const Symbol_value<64>* psymval = sized_relobj->local_symbol(r_sym);
2092 unsigned int plt_offset = ((object->local_plt_offset(r_sym)
2093 - (psymval->is_ifunc_symbol()
2094 ? 0 : plt_entry_size))
7a0c0a14
CC		 2095 / (plt_entry_size / aplt_entry_size));
2096 return (this->address()
2097 + this->aplt_offset_
2098 + this->regular_count() * aplt_entry_size
2099 + plt_offset);
2100}
2101
2102// Set the final size.
2103void
2104Output_data_plt_x86_64_bnd::set_final_data_size()
2105{
2106 // Number of regular and IFUNC PLT entries.
2107 unsigned int count = this->entry_count();
2108 // Count the first entry and the TLSDESC entry, if present.
2109 unsigned int extra = this->has_tlsdesc_entry() ? 2 : 1;
2110 unsigned int plt_size = (count + extra) * plt_entry_size;
2111 // Offset of the APLT.
2112 this->aplt_offset_ = plt_size;
2113 // Size of the APLT.
2114 plt_size += count * aplt_entry_size;
2115 this->set_data_size(plt_size);
2116}
2117
2118// The first entry in the BND PLT.
2119
2120const unsigned char
2121Output_data_plt_x86_64_bnd::first_plt_entry[plt_entry_size] =
2122{
2123 // From AMD64 ABI Draft 0.98, page 76
2124 0xff, 0x35, // pushq contents of memory address
2125 0, 0, 0, 0, // replaced with address of .got + 8
2126 0xf2, 0xff, 0x25, // bnd jmp indirect
2127 0, 0, 0, 0, // replaced with address of .got + 16
2128 0x0f, 0x1f, 0x00 // nop
2129};
2130
2131void
2132Output_data_plt_x86_64_bnd::do_fill_first_plt_entry(
2133 unsigned char* pov,
6624f3a1
CC		 2134 elfcpp::Elf_types<64>::Elf_Addr got_address,
2135 elfcpp::Elf_types<64>::Elf_Addr plt_address)
7a0c0a14
CC		 2136{
2137 memcpy(pov, first_plt_entry, plt_entry_size);
2138 // We do a jmp relative to the PC at the end of this instruction.
2139 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2140 (got_address + 8
2141 - (plt_address + 6)));
2142 elfcpp::Swap<32, false>::writeval(pov + 9,
2143 (got_address + 16
2144 - (plt_address + 13)));
2145}
2146
2147// Subsequent entries in the BND PLT.
2148
2149const unsigned char
2150Output_data_plt_x86_64_bnd::plt_entry[plt_entry_size] =
2151{
2152 // From AMD64 ABI Draft 0.99.8, page 139
2153 0x68, // pushq immediate
2154 0, 0, 0, 0, // replaced with offset into relocation table
2155 0xf2, 0xe9, // bnd jmpq relative
2156 0, 0, 0, 0, // replaced with offset to start of .plt
2157 0x0f, 0x1f, 0x44, 0, 0 // nop
2158};
2159
2160// Entries in the BND Additional PLT.
2161
2162const unsigned char
2163Output_data_plt_x86_64_bnd::aplt_entry[aplt_entry_size] =
2164{
2165 // From AMD64 ABI Draft 0.99.8, page 139
2166 0xf2, 0xff, 0x25, // bnd jmpq indirect
2167 0, 0, 0, 0, // replaced with address of symbol in .got
2168 0x90, // nop
2169};
2170
2171unsigned int
2172Output_data_plt_x86_64_bnd::do_fill_plt_entry(
2173 unsigned char* pov,
6624f3a1
CC		 2174 elfcpp::Elf_types<64>::Elf_Addr,
2175 elfcpp::Elf_types<64>::Elf_Addr,
7a0c0a14
CC		 2176 unsigned int,
2177 unsigned int plt_offset,
2178 unsigned int plt_index)
2179{
2180 memcpy(pov, plt_entry, plt_entry_size);
2181 elfcpp::Swap_unaligned<32, false>::writeval(pov + 1, plt_index);
2182 elfcpp::Swap<32, false>::writeval(pov + 7, -(plt_offset + 11));
2183 return 0;
2184}
2185
2186void
2187Output_data_plt_x86_64_bnd::fill_aplt_entry(
2188 unsigned char* pov,
6624f3a1
CC		 2189 elfcpp::Elf_types<64>::Elf_Addr got_address,
2190 elfcpp::Elf_types<64>::Elf_Addr plt_address,
7a0c0a14
CC		 2191 unsigned int got_offset,
2192 unsigned int plt_offset,
2193 unsigned int plt_index)
2194{
2195 // Check PC-relative offset overflow in PLT entry.
2196 uint64_t plt_got_pcrel_offset = (got_address + got_offset
2197 - (plt_address + plt_offset + 7));
2198 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
2199 gold_error(_("PC-relative offset overflow in APLT entry %d"),
2200 plt_index + 1);
2201
2202 memcpy(pov, aplt_entry, aplt_entry_size);
2203 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, plt_got_pcrel_offset);
2204}
2205
2206// The reserved TLSDESC entry in the PLT for an executable.
2207
2208const unsigned char
2209Output_data_plt_x86_64_bnd::tlsdesc_plt_entry[plt_entry_size] =
2210{
2211 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
2212 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
2213 0xff, 0x35, // pushq x(%rip)
2214 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
2215 0xf2, 0xff, 0x25, // jmpq *y(%rip)
2216 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
2217 0x0f, 0x1f, 0 // nop
2218};
2219
2220void
2221Output_data_plt_x86_64_bnd::do_fill_tlsdesc_entry(
2222 unsigned char* pov,
6624f3a1
CC		 2223 elfcpp::Elf_types<64>::Elf_Addr got_address,
2224 elfcpp::Elf_types<64>::Elf_Addr plt_address,
2225 elfcpp::Elf_types<64>::Elf_Addr got_base,
7a0c0a14
CC		 2226 unsigned int tlsdesc_got_offset,
2227 unsigned int plt_offset)
2228{
2229 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
2230 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2231 (got_address + 8
2232 - (plt_address + plt_offset
2233 + 6)));
2234 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
2235 (got_base
2236 + tlsdesc_got_offset
2237 - (plt_address + plt_offset
2238 + 13)));
2239}
2240
750ea5ed
CC		 2241// Return the APLT address to use for a global symbol (for IBT).
2242
2243template<int size>
2244uint64_t
2245Output_data_plt_x86_64_ibt<size>::do_address_for_global(const Symbol* gsym)
2246{
2247 uint64_t offset = this->aplt_offset_;
2248 // Convert the PLT offset into an APLT offset.
2249 unsigned int plt_offset = gsym->plt_offset();
2250 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2251 && gsym->can_use_relative_reloc(false))
2252 offset += this->regular_count() * aplt_entry_size;
2253 else
2254 plt_offset -= plt_entry_size;
2255 plt_offset = plt_offset / (plt_entry_size / aplt_entry_size);
2256 return this->address() + offset + plt_offset;
2257}
2258
2259// Return the PLT address to use for a local symbol. These are always
2260// IRELATIVE relocs.
2261
2262template<int size>
2263uint64_t
2264Output_data_plt_x86_64_ibt<size>::do_address_for_local(const Relobj* object,
2265 unsigned int r_sym)
2266{
2267 // Convert the PLT offset into an APLT offset.
e977e747
L		 2268 const Sized_relobj_file<size, false>* sized_relobj =
2269 static_cast<const Sized_relobj_file<size, false>*>(object);
2270 const Symbol_value<size>* psymval = sized_relobj->local_symbol(r_sym);
2271 unsigned int plt_offset = ((object->local_plt_offset(r_sym)
2272 - (psymval->is_ifunc_symbol()
2273 ? 0 : plt_entry_size))
750ea5ed
CC		 2274 / (plt_entry_size / aplt_entry_size));
2275 return (this->address()
2276 + this->aplt_offset_
2277 + this->regular_count() * aplt_entry_size
2278 + plt_offset);
2279}
2280
2281// Set the final size.
2282
2283template<int size>
2284void
2285Output_data_plt_x86_64_ibt<size>::set_final_data_size()
2286{
2287 // Number of regular and IFUNC PLT entries.
2288 unsigned int count = this->entry_count();
2289 // Count the first entry and the TLSDESC entry, if present.
2290 unsigned int extra = this->has_tlsdesc_entry() ? 2 : 1;
2291 unsigned int plt_size = (count + extra) * plt_entry_size;
2292 // Offset of the APLT.
2293 this->aplt_offset_ = plt_size;
2294 // Size of the APLT.
2295 plt_size += count * aplt_entry_size;
2296 this->set_data_size(plt_size);
2297}
2298
2299// The first entry in the IBT PLT.
2300
2301template<>
2302const unsigned char
2303Output_data_plt_x86_64_ibt<32>::first_plt_entry[plt_entry_size] =
2304{
2305 // MPX isn't supported for x32, so we don't need the BND prefix.
2306 // From AMD64 ABI Draft 0.98, page 76
2307 0xff, 0x35, // pushq contents of memory address
2308 0, 0, 0, 0, // replaced with address of .got + 8
2309 0xff, 0x25, // jmp indirect
2310 0, 0, 0, 0, // replaced with address of .got + 16
2311 0x90, 0x90, 0x90, 0x90 // noop (x4)
2312};
2313
2314template<>
2315const unsigned char
2316Output_data_plt_x86_64_ibt<64>::first_plt_entry[plt_entry_size] =
2317{
2318 // Use the BND prefix so that IBT is compatible with MPX.
2319 0xff, 0x35, // pushq contents of memory address
2320 0, 0, 0, 0, // replaced with address of .got + 8
2321 0xf2, 0xff, 0x25, // bnd jmp indirect
2322 0, 0, 0, 0, // replaced with address of .got + 16
2323 0x0f, 0x1f, 0x00 // nop
2324};
2325
2326template<int size>
2327void
2328Output_data_plt_x86_64_ibt<size>::do_fill_first_plt_entry(
2329 unsigned char* pov,
2330 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2331 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
2332{
2333 // Offsets to the addresses needing relocation.
2334 const unsigned int roff1 = 2;
2335 const unsigned int roff2 = (size == 32) ? 8 : 9;
2336
2337 memcpy(pov, first_plt_entry, plt_entry_size);
2338 // We do a jmp relative to the PC at the end of this instruction.
2339 elfcpp::Swap_unaligned<32, false>::writeval(pov + roff1,
2340 (got_address + 8
2341 - (plt_address + roff1 + 4)));
2342 elfcpp::Swap<32, false>::writeval(pov + roff2,
2343 (got_address + 16
2344 - (plt_address + roff2 + 4)));
2345}
2346
2347// Subsequent entries in the IBT PLT.
2348
2349template<>
2350const unsigned char
2351Output_data_plt_x86_64_ibt<32>::plt_entry[plt_entry_size] =
2352{
2353 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2354 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2355 0x68, // pushq immediate
2356 0, 0, 0, 0, // replaced with offset into relocation table
2357 0xe9, // jmpq relative
2358 0, 0, 0, 0, // replaced with offset to start of .plt
2359 0x90, 0x90 // nop
2360};
2361
2362template<>
2363const unsigned char
2364Output_data_plt_x86_64_ibt<64>::plt_entry[plt_entry_size] =
2365{
2366 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2367 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2368 0x68, // pushq immediate
2369 0, 0, 0, 0, // replaced with offset into relocation table
2370 0xf2, 0xe9, // bnd jmpq relative
2371 0, 0, 0, 0, // replaced with offset to start of .plt
2372 0x90 // nop
2373};
2374
2375// Entries in the IBT Additional PLT.
2376
2377template<>
2378const unsigned char
2379Output_data_plt_x86_64_ibt<32>::aplt_entry[aplt_entry_size] =
2380{
2381 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2382 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2383 0xff, 0x25, // jmpq indirect
2384 0, 0, 0, 0, // replaced with address of symbol in .got
2385 0x0f, 0x1f, 0x04, 0x00, // nop
2386 0x90, 0x90 // nop
2387};
2388
2389template<>
2390const unsigned char
2391Output_data_plt_x86_64_ibt<64>::aplt_entry[aplt_entry_size] =
2392{
2393 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2394 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2395 0xf2, 0xff, 0x25, // bnd jmpq indirect
2396 0, 0, 0, 0, // replaced with address of symbol in .got
2397 0x0f, 0x1f, 0x04, 0x00, // nop
2398 0x90, // nop
2399};
2400
2401template<int size>
2402unsigned int
2403Output_data_plt_x86_64_ibt<size>::do_fill_plt_entry(
2404 unsigned char* pov,
2405 typename elfcpp::Elf_types<size>::Elf_Addr,
2406 typename elfcpp::Elf_types<size>::Elf_Addr,
2407 unsigned int,
2408 unsigned int plt_offset,
2409 unsigned int plt_index)
2410{
2411 // Offsets to the addresses needing relocation.
2412 const unsigned int roff1 = 5;
2413 const unsigned int roff2 = (size == 32) ? 10 : 11;
2414
2415 memcpy(pov, plt_entry, plt_entry_size);
2416 elfcpp::Swap_unaligned<32, false>::writeval(pov + roff1, plt_index);
2417 elfcpp::Swap<32, false>::writeval(pov + roff2, -(plt_offset + roff2 + 4));
2418 return 0;
2419}
2420
2421template<int size>
2422void
2423Output_data_plt_x86_64_ibt<size>::fill_aplt_entry(
2424 unsigned char* pov,
2425 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2426 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
2427 unsigned int got_offset,
2428 unsigned int plt_offset,
2429 unsigned int plt_index)
2430{
2431 // Offset to the address needing relocation.
2432 const unsigned int roff = (size == 32) ? 6 : 7;
2433
2434 // Check PC-relative offset overflow in PLT entry.
2435 uint64_t plt_got_pcrel_offset = (got_address + got_offset
2436 - (plt_address + plt_offset + roff + 4));
2437 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
2438 gold_error(_("PC-relative offset overflow in APLT entry %d"),
2439 plt_index + 1);
2440
2441 memcpy(pov, aplt_entry, aplt_entry_size);
2442 elfcpp::Swap_unaligned<32, false>::writeval(pov + roff, plt_got_pcrel_offset);
2443}
2444
2445// The reserved TLSDESC entry in the IBT PLT for an executable.
2446
2447template<int size>
2448const unsigned char
2449Output_data_plt_x86_64_ibt<size>::tlsdesc_plt_entry[plt_entry_size] =
2450{
2451 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
2452 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
2453 0xff, 0x35, // pushq x(%rip)
2454 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
2455 0xf2, 0xff, 0x25, // jmpq *y(%rip)
2456 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
2457 0x0f, 0x1f, 0 // nop
2458};
2459
2460template<int size>
2461void
2462Output_data_plt_x86_64_ibt<size>::do_fill_tlsdesc_entry(
2463 unsigned char* pov,
2464 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2465 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
2466 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
2467 unsigned int tlsdesc_got_offset,
2468 unsigned int plt_offset)
2469{
2470 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
2471 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2472 (got_address + 8
2473 - (plt_address + plt_offset
2474 + 6)));
2475 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
2476 (got_base
2477 + tlsdesc_got_offset
2478 - (plt_address + plt_offset
2479 + 13)));
2480}
2481
07a60597
ILT		 2482// The .eh_frame unwind information for the PLT.
2483
fc51264f 2484template<int size>
2e702c99 2485const unsigned char
fc51264f 2486Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
07a60597
ILT		 2487{
2488 1, // CIE version.
2489 'z', // Augmentation: augmentation size included.
2490 'R', // Augmentation: FDE encoding included.
2491 '\0', // End of augmentation string.
2492 1, // Code alignment factor.
2493 0x78, // Data alignment factor.
2494 16, // Return address column.
2495 1, // Augmentation size.
2496 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
2497 | elfcpp::DW_EH_PE_sdata4),
2498 elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
2499 elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
2500 elfcpp::DW_CFA_nop, // Align to 16 bytes.
2501 elfcpp::DW_CFA_nop
2502};
2503
fc51264f 2504template<int size>
07a60597 2505const unsigned char
2e702c99 2506Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
07a60597
ILT		 2507{
2508 0, 0, 0, 0, // Replaced with offset to .plt.
2509 0, 0, 0, 0, // Replaced with size of .plt.
2510 0, // Augmentation size.
2511 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
2512 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
2513 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
2514 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
2515 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
2516 11, // Block length.
2517 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
2518 elfcpp::DW_OP_breg16, 0, // Push %rip.
2519 elfcpp::DW_OP_lit15, // Push 0xf.
2520 elfcpp::DW_OP_and, // & (%rip & 0xf).
2521 elfcpp::DW_OP_lit11, // Push 0xb.
2522 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
2523 elfcpp::DW_OP_lit3, // Push 3.
2524 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
2525 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
2526 elfcpp::DW_CFA_nop, // Align to 32 bytes.
2527 elfcpp::DW_CFA_nop,
2528 elfcpp::DW_CFA_nop,
2529 elfcpp::DW_CFA_nop
2530};
2531
7a0c0a14
CC		 2532// The .eh_frame unwind information for the BND PLT.
2533const unsigned char
2534Output_data_plt_x86_64_bnd::plt_eh_frame_fde[plt_eh_frame_fde_size] =
2535{
2536 0, 0, 0, 0, // Replaced with offset to .plt.
2537 0, 0, 0, 0, // Replaced with size of .plt.
2538 0, // Augmentation size.
2539 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
2540 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
2541 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
2542 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
2543 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
2544 11, // Block length.
2545 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
2546 elfcpp::DW_OP_breg16, 0, // Push %rip.
2547 elfcpp::DW_OP_lit15, // Push 0xf.
2548 elfcpp::DW_OP_and, // & (%rip & 0xf).
2549 elfcpp::DW_OP_lit5, // Push 5.
2550 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 5)
2551 elfcpp::DW_OP_lit3, // Push 3.
2552 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 5) << 3)
2553 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=5)<<3)+%rsp+8
2554 elfcpp::DW_CFA_nop, // Align to 32 bytes.
2555 elfcpp::DW_CFA_nop,
2556 elfcpp::DW_CFA_nop,
2557 elfcpp::DW_CFA_nop
2558};
2559
750ea5ed
CC		 2560// The .eh_frame unwind information for the BND PLT.
2561template<int size>
2562const unsigned char
2563Output_data_plt_x86_64_ibt<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
2564{
2565 0, 0, 0, 0, // Replaced with offset to .plt.
2566 0, 0, 0, 0, // Replaced with size of .plt.
2567 0, // Augmentation size.
2568 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
2569 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
2570 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
2571 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
2572 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
2573 11, // Block length.
2574 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
2575 elfcpp::DW_OP_breg16, 0, // Push %rip.
2576 elfcpp::DW_OP_lit15, // Push 0xf.
2577 elfcpp::DW_OP_and, // & (%rip & 0xf).
2578 elfcpp::DW_OP_lit9, // Push 9.
2579 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 9)
2580 elfcpp::DW_OP_lit3, // Push 3.
2581 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 9) << 3)
2582 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=9)<<3)+%rsp+8
2583 elfcpp::DW_CFA_nop, // Align to 32 bytes.
2584 elfcpp::DW_CFA_nop,
2585 elfcpp::DW_CFA_nop,
2586 elfcpp::DW_CFA_nop
2587};
2588
2e30d253
ILT		 2589// Write out the PLT. This uses the hand-coded instructions above,
2590// and adjusts them as needed. This is specified by the AMD64 ABI.
2591
fc51264f 2592template<int size>
2e30d253 2593void
fc51264f 2594Output_data_plt_x86_64<size>::do_write(Output_file* of)
2e30d253 2595{
2ea97941 2596 const off_t offset = this->offset();
fe8718a4
ILT		 2597 const section_size_type oview_size =
2598 convert_to_section_size_type(this->data_size());
2ea97941 2599 unsigned char* const oview = of->get_output_view(offset, oview_size);
2e30d253
ILT		 2600
2601 const off_t got_file_offset = this->got_plt_->offset();
67181c72
ILT		 2602 gold_assert(parameters->incremental_update()
2603 || (got_file_offset + this->got_plt_->data_size()
2604 == this->got_irelative_->offset()));
fe8718a4 2605 const section_size_type got_size =
67181c72
ILT		 2606 convert_to_section_size_type(this->got_plt_->data_size()
2607 + this->got_irelative_->data_size());
2e30d253
ILT		 2608 unsigned char* const got_view = of->get_output_view(got_file_offset,
2609 got_size);
2610
2611 unsigned char* pov = oview;
2612
c2b45e22 2613 // The base address of the .plt section.
fc51264f 2614 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
c2b45e22 2615 // The base address of the .got section.
fc51264f 2616 typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
c2b45e22
CC		 2617 // The base address of the PLT portion of the .got section,
2618 // which is where the GOT pointer will point, and where the
2619 // three reserved GOT entries are located.
fc51264f
L		 2620 typename elfcpp::Elf_types<size>::Elf_Addr got_address
2621 = this->got_plt_->address();
2e30d253 2622
2e702c99
RM		 2623 this->fill_first_plt_entry(pov, got_address, plt_address);
2624 pov += this->get_plt_entry_size();
2e30d253 2625
57b2284c
CC		 2626 // The first three entries in the GOT are reserved, and are written
2627 // by Output_data_got_plt_x86_64::do_write.
2628 unsigned char* got_pov = got_view + 24;
2e30d253 2629
2e702c99 2630 unsigned int plt_offset = this->get_plt_entry_size();
2e30d253 2631 unsigned int got_offset = 24;
67181c72 2632 const unsigned int count = this->count_ + this->irelative_count_;
2e30d253
ILT		 2633 for (unsigned int plt_index = 0;
2634 plt_index < count;
2635 ++plt_index,
2e702c99 2636 pov += this->get_plt_entry_size(),
2e30d253 2637 got_pov += 8,
2e702c99 2638 plt_offset += this->get_plt_entry_size(),
2e30d253
ILT		 2639 got_offset += 8)
2640 {
2641 // Set and adjust the PLT entry itself.
2e702c99
RM		 2642 unsigned int lazy_offset = this->fill_plt_entry(pov,
2643 got_address, plt_address,
2644 got_offset, plt_offset,
2645 plt_index);
2e30d253
ILT		 2646
2647 // Set the entry in the GOT.
2e702c99
RM		 2648 elfcpp::Swap<64, false>::writeval(got_pov,
2649 plt_address + plt_offset + lazy_offset);
2e30d253
ILT		 2650 }
2651
c2b45e22
CC		 2652 if (this->has_tlsdesc_entry())
2653 {
2654 // Set and adjust the reserved TLSDESC PLT entry.
2655 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2e702c99
RM		 2656 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
2657 tlsdesc_got_offset, plt_offset);
2658 pov += this->get_plt_entry_size();
c2b45e22
CC		 2659 }
2660
fe8718a4
ILT		 2661 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
2662 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2e30d253 2663
2ea97941 2664 of->write_output_view(offset, oview_size, oview);
2e30d253
ILT		 2665 of->write_output_view(got_file_offset, got_size, got_view);
2666}
2667
7a0c0a14
CC		 2668// Write out the BND PLT.
2669
2670void
2671Output_data_plt_x86_64_bnd::do_write(Output_file* of)
2672{
2673 const off_t offset = this->offset();
2674 const section_size_type oview_size =
2675 convert_to_section_size_type(this->data_size());
2676 unsigned char* const oview = of->get_output_view(offset, oview_size);
2677
2678 Output_data_got<64, false>* got = this->got();
2679 Output_data_got_plt_x86_64* got_plt = this->got_plt();
2680 Output_data_space* got_irelative = this->got_irelative();
2681
2682 const off_t got_file_offset = got_plt->offset();
2683 gold_assert(parameters->incremental_update()
2684 || (got_file_offset + got_plt->data_size()
2685 == got_irelative->offset()));
2686 const section_size_type got_size =
2687 convert_to_section_size_type(got_plt->data_size()
2688 + got_irelative->data_size());
2689 unsigned char* const got_view = of->get_output_view(got_file_offset,
2690 got_size);
2691
2692 unsigned char* pov = oview;
2693
2694 // The base address of the .plt section.
6624f3a1 2695 elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address();
7a0c0a14 2696 // The base address of the .got section.
6624f3a1 2697 elfcpp::Elf_types<64>::Elf_Addr got_base = got->address();
7a0c0a14
CC		 2698 // The base address of the PLT portion of the .got section,
2699 // which is where the GOT pointer will point, and where the
2700 // three reserved GOT entries are located.
6624f3a1 2701 elfcpp::Elf_types<64>::Elf_Addr got_address = got_plt->address();
7a0c0a14
CC		 2702
2703 this->fill_first_plt_entry(pov, got_address, plt_address);
2704 pov += plt_entry_size;
2705
2706 // The first three entries in the GOT are reserved, and are written
2707 // by Output_data_got_plt_x86_64::do_write.
2708 unsigned char* got_pov = got_view + 24;
2709
2710 unsigned int plt_offset = plt_entry_size;
2711 unsigned int got_offset = 24;
2712 const unsigned int count = this->entry_count();
2713 for (unsigned int plt_index = 0;
2714 plt_index < count;
2715 ++plt_index,
2716 pov += plt_entry_size,
2717 got_pov += 8,
2718 plt_offset += plt_entry_size,
2719 got_offset += 8)
2720 {
2721 // Set and adjust the PLT entry itself.
2722 unsigned int lazy_offset = this->fill_plt_entry(pov,
2723 got_address, plt_address,
2724 got_offset, plt_offset,
2725 plt_index);
2726
2727 // Set the entry in the GOT.
2728 elfcpp::Swap<64, false>::writeval(got_pov,
2729 plt_address + plt_offset + lazy_offset);
2730 }
2731
2732 if (this->has_tlsdesc_entry())
2733 {
2734 // Set and adjust the reserved TLSDESC PLT entry.
2735 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2736 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
2737 tlsdesc_got_offset, plt_offset);
2738 pov += this->get_plt_entry_size();
48bc2182 2739 plt_offset += plt_entry_size;
7a0c0a14
CC		 2740 }
2741
2742 // Write the additional PLT.
2743 got_offset = 24;
2744 for (unsigned int plt_index = 0;
2745 plt_index < count;
2746 ++plt_index,
2747 pov += aplt_entry_size,
2748 plt_offset += aplt_entry_size,
2749 got_offset += 8)
750ea5ed
CC		 2750 {
2751 // Set and adjust the APLT entry.
2752 this->fill_aplt_entry(pov, got_address, plt_address, got_offset,
2753 plt_offset, plt_index);
2754 }
2755
2756 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
2757 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2758
2759 of->write_output_view(offset, oview_size, oview);
2760 of->write_output_view(got_file_offset, got_size, got_view);
2761}
2762
2763// Write out the IBT PLT.
2764
2765template<int size>
2766void
2767Output_data_plt_x86_64_ibt<size>::do_write(Output_file* of)
2768{
2769 const off_t offset = this->offset();
2770 const section_size_type oview_size =
2771 convert_to_section_size_type(this->data_size());
2772 unsigned char* const oview = of->get_output_view(offset, oview_size);
2773
2774 Output_data_got<64, false>* got = this->got();
2775 Output_data_got_plt_x86_64* got_plt = this->got_plt();
2776 Output_data_space* got_irelative = this->got_irelative();
2777
2778 const off_t got_file_offset = got_plt->offset();
2779 gold_assert(parameters->incremental_update()
2780 || (got_file_offset + got_plt->data_size()
2781 == got_irelative->offset()));
2782 const section_size_type got_size =
2783 convert_to_section_size_type(got_plt->data_size()
2784 + got_irelative->data_size());
2785 unsigned char* const got_view = of->get_output_view(got_file_offset,
2786 got_size);
2787
2788 unsigned char* pov = oview;
2789
2790 // The base address of the .plt section.
2791 elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address();
2792 // The base address of the .got section.
2793 elfcpp::Elf_types<64>::Elf_Addr got_base = got->address();
2794 // The base address of the PLT portion of the .got section,
2795 // which is where the GOT pointer will point, and where the
2796 // three reserved GOT entries are located.
2797 elfcpp::Elf_types<64>::Elf_Addr got_address = got_plt->address();
2798
2799 this->fill_first_plt_entry(pov, got_address, plt_address);
2800 pov += plt_entry_size;
2801
2802 // The first three entries in the GOT are reserved, and are written
2803 // by Output_data_got_plt_x86_64::do_write.
2804 unsigned char* got_pov = got_view + 24;
2805
2806 unsigned int plt_offset = plt_entry_size;
2807 unsigned int got_offset = 24;
2808 const unsigned int count = this->entry_count();
2809 for (unsigned int plt_index = 0;
2810 plt_index < count;
2811 ++plt_index,
2812 pov += plt_entry_size,
2813 got_pov += 8,
2814 plt_offset += plt_entry_size,
2815 got_offset += 8)
7a0c0a14
CC		 2816 {
2817 // Set and adjust the PLT entry itself.
750ea5ed
CC		 2818 unsigned int lazy_offset = this->fill_plt_entry(pov,
2819 got_address, plt_address,
2820 got_offset, plt_offset,
2821 plt_index);
2822
2823 // Set the entry in the GOT.
2824 elfcpp::Swap<64, false>::writeval(got_pov,
2825 plt_address + plt_offset + lazy_offset);
2826 }
2827
2828 if (this->has_tlsdesc_entry())
2829 {
2830 // Set and adjust the reserved TLSDESC PLT entry.
2831 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2832 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
2833 tlsdesc_got_offset, plt_offset);
2834 pov += this->get_plt_entry_size();
48bc2182 2835 plt_offset += plt_entry_size;
750ea5ed
CC		 2836 }
2837
2838 // Write the additional PLT.
2839 got_offset = 24;
2840 for (unsigned int plt_index = 0;
2841 plt_index < count;
2842 ++plt_index,
2843 pov += aplt_entry_size,
2844 plt_offset += aplt_entry_size,
2845 got_offset += 8)
2846 {
2847 // Set and adjust the APLT entry.
7a0c0a14
CC		 2848 this->fill_aplt_entry(pov, got_address, plt_address, got_offset,
2849 plt_offset, plt_index);
2850 }
2851
2852 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
2853 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2854
2855 of->write_output_view(offset, oview_size, oview);
2856 of->write_output_view(got_file_offset, got_size, got_view);
2857}
2858
c2b45e22 2859// Create the PLT section.
2e30d253 2860
fc51264f 2861template<int size>
2e30d253 2862void
fc51264f 2863Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
2e30d253 2864{
2e30d253
ILT		 2865 if (this->plt_ == NULL)
2866 {
2867 // Create the GOT sections first.
2868 this->got_section(symtab, layout);
2869
2e702c99
RM		 2870 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
2871 this->got_irelative_);
2872
2873 // Add unwind information if requested.
2874 if (parameters->options().ld_generated_unwind_info())
2875 this->plt_->add_eh_frame(layout);
2876
2e30d253
ILT		 2877 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
2878 (elfcpp::SHF_ALLOC
2879 | elfcpp::SHF_EXECINSTR),
22f0da72 2880 this->plt_, ORDER_PLT, false);
7223e9ca
ILT		 2881
2882 // Make the sh_info field of .rela.plt point to .plt.
2883 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
2884 rela_plt_os->set_info_section(this->plt_->output_section());
2e30d253 2885 }
c2b45e22
CC		 2886}
2887
7a0c0a14
CC		 2888template<>
2889Output_data_plt_x86_64<32>*
2890Target_x86_64<32>::do_make_data_plt(Layout* layout,
2891 Output_data_got<64, false>* got,
2892 Output_data_got_plt_x86_64* got_plt,
2893 Output_data_space* got_irelative)
2894{
750ea5ed
CC		 2895 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2896 return new Output_data_plt_x86_64_ibt<32>(layout, got, got_plt,
2897 got_irelative);
7a0c0a14
CC		 2898 return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt,
2899 got_irelative);
2900}
2901
2902template<>
2903Output_data_plt_x86_64<64>*
2904Target_x86_64<64>::do_make_data_plt(Layout* layout,
2905 Output_data_got<64, false>* got,
2906 Output_data_got_plt_x86_64* got_plt,
2907 Output_data_space* got_irelative)
2908{
750ea5ed
CC		 2909 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2910 return new Output_data_plt_x86_64_ibt<64>(layout, got, got_plt,
2911 got_irelative);
2912 else if (parameters->options().bndplt())
7a0c0a14
CC		 2913 return new Output_data_plt_x86_64_bnd(layout, got, got_plt,
2914 got_irelative);
2915 else
2916 return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt,
2917 got_irelative);
2918}
2919
2920template<>
2921Output_data_plt_x86_64<32>*
2922Target_x86_64<32>::do_make_data_plt(Layout* layout,
2923 Output_data_got<64, false>* got,
2924 Output_data_got_plt_x86_64* got_plt,
2925 Output_data_space* got_irelative,
2926 unsigned int plt_count)
2927{
750ea5ed
CC		 2928 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2929 return new Output_data_plt_x86_64_ibt<32>(layout, got, got_plt,
2930 got_irelative, plt_count);
7a0c0a14 2931 return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt,
750ea5ed 2932 got_irelative, plt_count);
7a0c0a14
CC		 2933}
2934
2935template<>
2936Output_data_plt_x86_64<64>*
2937Target_x86_64<64>::do_make_data_plt(Layout* layout,
2938 Output_data_got<64, false>* got,
2939 Output_data_got_plt_x86_64* got_plt,
2940 Output_data_space* got_irelative,
2941 unsigned int plt_count)
2942{
750ea5ed
CC		 2943 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2944 return new Output_data_plt_x86_64_ibt<64>(layout, got, got_plt,
2945 got_irelative, plt_count);
2946 else if (parameters->options().bndplt())
7a0c0a14
CC		 2947 return new Output_data_plt_x86_64_bnd(layout, got, got_plt,
2948 got_irelative, plt_count);
2949 else
2950 return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt,
2951 got_irelative,
2952 plt_count);
2953}
2954
e291e7b9
ILT		 2955// Return the section for TLSDESC relocations.
2956
fc51264f
L		 2957template<int size>
2958typename Target_x86_64<size>::Reloc_section*
2959Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
e291e7b9
ILT		 2960{
2961 return this->plt_section()->rela_tlsdesc(layout);
2962}
2963
c2b45e22
CC		 2964// Create a PLT entry for a global symbol.
2965
fc51264f 2966template<int size>
c2b45e22 2967void
fc51264f
L		 2968Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
2969 Symbol* gsym)
c2b45e22
CC		 2970{
2971 if (gsym->has_plt_offset())
2972 return;
2973
2974 if (this->plt_ == NULL)
2975 this->make_plt_section(symtab, layout);
2e30d253 2976
67181c72 2977 this->plt_->add_entry(symtab, layout, gsym);
2e30d253
ILT		 2978}
2979
7223e9ca
ILT		 2980// Make a PLT entry for a local STT_GNU_IFUNC symbol.
2981
fc51264f 2982template<int size>
7223e9ca 2983void
fc51264f
L		 2984Target_x86_64<size>::make_local_ifunc_plt_entry(
2985 Symbol_table* symtab, Layout* layout,
2986 Sized_relobj_file<size, false>* relobj,
2987 unsigned int local_sym_index)
7223e9ca
ILT		 2988{
2989 if (relobj->local_has_plt_offset(local_sym_index))
2990 return;
2991 if (this->plt_ == NULL)
2992 this->make_plt_section(symtab, layout);
67181c72
ILT		 2993 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
2994 relobj,
7223e9ca
ILT		 2995 local_sym_index);
2996 relobj->set_local_plt_offset(local_sym_index, plt_offset);
2997}
2998
0e70b911
CC		 2999// Return the number of entries in the PLT.
3000
fc51264f 3001template<int size>
0e70b911 3002unsigned int
fc51264f 3003Target_x86_64<size>::plt_entry_count() const
0e70b911
CC		 3004{
3005 if (this->plt_ == NULL)
3006 return 0;
3007 return this->plt_->entry_count();
3008}
3009
3010// Return the offset of the first non-reserved PLT entry.
3011
fc51264f 3012template<int size>
0e70b911 3013unsigned int
fc51264f 3014Target_x86_64<size>::first_plt_entry_offset() const
0e70b911 3015{
8474a88f
L		 3016 if (this->plt_ == NULL)
3017 return 0;
2e702c99 3018 return this->plt_->first_plt_entry_offset();
0e70b911
CC		 3019}
3020
3021// Return the size of each PLT entry.
3022
fc51264f 3023template<int size>
0e70b911 3024unsigned int
fc51264f 3025Target_x86_64<size>::plt_entry_size() const
0e70b911 3026{
8474a88f
L		 3027 if (this->plt_ == NULL)
3028 return 0;
2e702c99 3029 return this->plt_->get_plt_entry_size();
0e70b911
CC		 3030}
3031
4829d394
CC		 3032// Create the GOT and PLT sections for an incremental update.
3033
fc51264f 3034template<int size>
dd74ae06 3035Output_data_got_base*
fc51264f 3036Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
4829d394
CC		 3037 Layout* layout,
3038 unsigned int got_count,
3039 unsigned int plt_count)
3040{
3041 gold_assert(this->got_ == NULL);
3042
3043 this->got_ = new Output_data_got<64, false>(got_count * 8);
3044 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
3045 (elfcpp::SHF_ALLOC
3046 | elfcpp::SHF_WRITE),
3047 this->got_, ORDER_RELRO_LAST,
3048 true);
3049
3050 // Add the three reserved entries.
57b2284c 3051 this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
4829d394
CC		 3052 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3053 (elfcpp::SHF_ALLOC
3054 | elfcpp::SHF_WRITE),
3055 this->got_plt_, ORDER_NON_RELRO_FIRST,
3056 false);
3057
3058 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3059 this->global_offset_table_ =
3060 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
3061 Symbol_table::PREDEFINED,
3062 this->got_plt_,
3063 0, 0, elfcpp::STT_OBJECT,
3064 elfcpp::STB_LOCAL,
3065 elfcpp::STV_HIDDEN, 0,
3066 false, false);
3067
3068 // If there are any TLSDESC relocations, they get GOT entries in
3069 // .got.plt after the jump slot entries.
3070 // FIXME: Get the count for TLSDESC entries.
3071 this->got_tlsdesc_ = new Output_data_got<64, false>(0);
3072 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3073 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
3074 this->got_tlsdesc_,
3075 ORDER_NON_RELRO_FIRST, false);
3076
67181c72
ILT		 3077 // If there are any IRELATIVE relocations, they get GOT entries in
3078 // .got.plt after the jump slot and TLSDESC entries.
3079 this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
3080 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3081 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
3082 this->got_irelative_,
3083 ORDER_NON_RELRO_FIRST, false);
3084
4829d394 3085 // Create the PLT section.
2e702c99
RM		 3086 this->plt_ = this->make_data_plt(layout, this->got_,
3087 this->got_plt_,
3088 this->got_irelative_,
3089 plt_count);
3090
3091 // Add unwind information if requested.
3092 if (parameters->options().ld_generated_unwind_info())
3093 this->plt_->add_eh_frame(layout);
3094
4829d394
CC		 3095 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
3096 elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
3097 this->plt_, ORDER_PLT, false);
3098
3099 // Make the sh_info field of .rela.plt point to .plt.
3100 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
3101 rela_plt_os->set_info_section(this->plt_->output_section());
3102
6fa2a40b
CC		 3103 // Create the rela_dyn section.
3104 this->rela_dyn_section(layout);
3105
4829d394
CC		 3106 return this->got_;
3107}
3108
6fa2a40b
CC		 3109// Reserve a GOT entry for a local symbol, and regenerate any
3110// necessary dynamic relocations.
3111
fc51264f 3112template<int size>
6fa2a40b 3113void
fc51264f 3114Target_x86_64<size>::reserve_local_got_entry(
6fa2a40b 3115 unsigned int got_index,
fc51264f 3116 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 3117 unsigned int r_sym,
3118 unsigned int got_type)
3119{
3120 unsigned int got_offset = got_index * 8;
3121 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
3122
3123 this->got_->reserve_local(got_index, obj, r_sym, got_type);
3124 switch (got_type)
3125 {
3126 case GOT_TYPE_STANDARD:
3127 if (parameters->options().output_is_position_independent())
3128 rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
397b129b 3129 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3130 break;
3131 case GOT_TYPE_TLS_OFFSET:
3132 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
3133 this->got_, got_offset, 0);
3134 break;
3135 case GOT_TYPE_TLS_PAIR:
3136 this->got_->reserve_slot(got_index + 1);
3137 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
3138 this->got_, got_offset, 0);
3139 break;
3140 case GOT_TYPE_TLS_DESC:
3141 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
3142 // this->got_->reserve_slot(got_index + 1);
3143 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
3144 // this->got_, got_offset, 0);
3145 break;
3146 default:
3147 gold_unreachable();
3148 }
3149}
3150
3151// Reserve a GOT entry for a global symbol, and regenerate any
3152// necessary dynamic relocations.
3153
fc51264f 3154template<int size>
6fa2a40b 3155void
fc51264f
L		 3156Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
3157 Symbol* gsym,
3158 unsigned int got_type)
6fa2a40b
CC		 3159{
3160 unsigned int got_offset = got_index * 8;
3161 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
3162
3163 this->got_->reserve_global(got_index, gsym, got_type);
3164 switch (got_type)
3165 {
3166 case GOT_TYPE_STANDARD:
3167 if (!gsym->final_value_is_known())
3168 {
3169 if (gsym->is_from_dynobj()
3170 || gsym->is_undefined()
3171 || gsym->is_preemptible()
3172 || gsym->type() == elfcpp::STT_GNU_IFUNC)
3173 rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
3174 this->got_, got_offset, 0);
3175 else
3176 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
13cf9988 3177 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3178 }
3179 break;
3180 case GOT_TYPE_TLS_OFFSET:
3181 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
13cf9988 3182 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3183 break;
3184 case GOT_TYPE_TLS_PAIR:
3185 this->got_->reserve_slot(got_index + 1);
3186 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
13cf9988 3187 this->got_, got_offset, 0, false);
6fa2a40b 3188 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
13cf9988 3189 this->got_, got_offset + 8, 0, false);
6fa2a40b
CC		 3190 break;
3191 case GOT_TYPE_TLS_DESC:
3192 this->got_->reserve_slot(got_index + 1);
3193 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
13cf9988 3194 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3195 break;
3196 default:
3197 gold_unreachable();
3198 }
3199}
3200
4829d394
CC		 3201// Register an existing PLT entry for a global symbol.
3202
fc51264f 3203template<int size>
4829d394 3204void
fc51264f
L		 3205Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
3206 Layout* layout,
3207 unsigned int plt_index,
3208 Symbol* gsym)
4829d394
CC		 3209{
3210 gold_assert(this->plt_ != NULL);
3211 gold_assert(!gsym->has_plt_offset());
3212
3213 this->plt_->reserve_slot(plt_index);
3214
3215 gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
3216
3217 unsigned int got_offset = (plt_index + 3) * 8;
67181c72 3218 this->plt_->add_relocation(symtab, layout, gsym, got_offset);
4829d394
CC		 3219}
3220
26d3c67d
CC		 3221// Force a COPY relocation for a given symbol.
3222
fc51264f 3223template<int size>
26d3c67d 3224void
fc51264f 3225Target_x86_64<size>::emit_copy_reloc(
26d3c67d
CC		 3226 Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
3227{
3228 this->copy_relocs_.emit_copy_reloc(symtab,
fc51264f 3229 symtab->get_sized_symbol<size>(sym),
26d3c67d
CC		 3230 os,
3231 offset,
3232 this->rela_dyn_section(NULL));
3233}
3234
9fa33bee 3235// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029 3236
fc51264f 3237template<int size>
edfbb029 3238void
fc51264f
L		 3239Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
3240 Layout* layout)
edfbb029
CC		 3241{
3242 if (this->tls_base_symbol_defined_)
3243 return;
3244
3245 Output_segment* tls_segment = layout->tls_segment();
3246 if (tls_segment != NULL)
3247 {
183fd0e3 3248 bool is_exec = parameters->options().output_is_executable();
edfbb029 3249 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 3250 Symbol_table::PREDEFINED,
edfbb029
CC		 3251 tls_segment, 0, 0,
3252 elfcpp::STT_TLS,
3253 elfcpp::STB_LOCAL,
3254 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 3255 (is_exec
3256 ? Symbol::SEGMENT_END
3257 : Symbol::SEGMENT_START),
3258 true);
edfbb029
CC		 3259 }
3260 this->tls_base_symbol_defined_ = true;
3261}
3262
c2b45e22
CC		 3263// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3264
fc51264f 3265template<int size>
c2b45e22 3266void
fc51264f 3267Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2e702c99 3268 Layout* layout)
c2b45e22
CC		 3269{
3270 if (this->plt_ == NULL)
3271 this->make_plt_section(symtab, layout);
3272
3273 if (!this->plt_->has_tlsdesc_entry())
3274 {
3275 // Allocate the TLSDESC_GOT entry.
3276 Output_data_got<64, false>* got = this->got_section(symtab, layout);
3277 unsigned int got_offset = got->add_constant(0);
3278
3279 // Allocate the TLSDESC_PLT entry.
3280 this->plt_->reserve_tlsdesc_entry(got_offset);
3281 }
3282}
3283
31d60480
ILT		 3284// Create a GOT entry for the TLS module index.
3285
fc51264f 3286template<int size>
31d60480 3287unsigned int
fc51264f
L		 3288Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
3289 Sized_relobj_file<size, false>* object)
31d60480
ILT		 3290{
3291 if (this->got_mod_index_offset_ == -1U)
3292 {
3293 gold_assert(symtab != NULL && layout != NULL && object != NULL);
3294 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
3295 Output_data_got<64, false>* got = this->got_section(symtab, layout);
3296 unsigned int got_offset = got->add_constant(0);
3297 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2e702c99 3298 got_offset, 0);
009a67a2 3299 got->add_constant(0);
31d60480
ILT		 3300 this->got_mod_index_offset_ = got_offset;
3301 }
3302 return this->got_mod_index_offset_;
3303}
3304
2e30d253
ILT		 3305// Optimize the TLS relocation type based on what we know about the
3306// symbol. IS_FINAL is true if the final address of this symbol is
3307// known at link time.
3308
fc51264f 3309template<int size>
e041f13d 3310tls::Tls_optimization
fc51264f 3311Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2e30d253 3312{
2e30d253
ILT		 3313 // If we are generating a shared library, then we can't do anything
3314 // in the linker.
8851ecca 3315 if (parameters->options().shared())
e041f13d 3316 return tls::TLSOPT_NONE;
2e30d253
ILT		 3317
3318 switch (r_type)
3319 {
3320 case elfcpp::R_X86_64_TLSGD:
e041f13d
ILT		 3321 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3322 case elfcpp::R_X86_64_TLSDESC_CALL:
3323 // These are General-Dynamic which permits fully general TLS
2e30d253
ILT		 3324 // access. Since we know that we are generating an executable,
3325 // we can convert this to Initial-Exec. If we also know that
3326 // this is a local symbol, we can further switch to Local-Exec.
3327 if (is_final)
e041f13d
ILT		 3328 return tls::TLSOPT_TO_LE;
3329 return tls::TLSOPT_TO_IE;
2e30d253 3330
d61c17ea 3331 case elfcpp::R_X86_64_TLSLD:
2e30d253
ILT		 3332 // This is Local-Dynamic, which refers to a local symbol in the
3333 // dynamic TLS block. Since we know that we generating an
3334 // executable, we can switch to Local-Exec.
e041f13d 3335 return tls::TLSOPT_TO_LE;
2e30d253 3336
0ffd9845 3337 case elfcpp::R_X86_64_DTPOFF32:
0ffd9845
ILT		 3338 case elfcpp::R_X86_64_DTPOFF64:
3339 // Another Local-Dynamic reloc.
e041f13d 3340 return tls::TLSOPT_TO_LE;
0ffd9845 3341
d61c17ea 3342 case elfcpp::R_X86_64_GOTTPOFF:
2e30d253
ILT		 3343 // These are Initial-Exec relocs which get the thread offset
3344 // from the GOT. If we know that we are linking against the
3345 // local symbol, we can switch to Local-Exec, which links the
3346 // thread offset into the instruction.
3347 if (is_final)
e041f13d
ILT		 3348 return tls::TLSOPT_TO_LE;
3349 return tls::TLSOPT_NONE;
2e30d253 3350
d61c17ea 3351 case elfcpp::R_X86_64_TPOFF32:
2e30d253
ILT		 3352 // When we already have Local-Exec, there is nothing further we
3353 // can do.
e041f13d 3354 return tls::TLSOPT_NONE;
2e30d253
ILT		 3355
3356 default:
3357 gold_unreachable();
3358 }
2e30d253
ILT		 3359}
3360
95a2c8d6
RS		 3361// Get the Reference_flags for a particular relocation.
3362
fc51264f 3363template<int size>
95a2c8d6 3364int
fc51264f 3365Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
95a2c8d6
RS		 3366{
3367 switch (r_type)
3368 {
3369 case elfcpp::R_X86_64_NONE:
3370 case elfcpp::R_X86_64_GNU_VTINHERIT:
3371 case elfcpp::R_X86_64_GNU_VTENTRY:
3372 case elfcpp::R_X86_64_GOTPC32:
3373 case elfcpp::R_X86_64_GOTPC64:
3374 // No symbol reference.
3375 return 0;
3376
3377 case elfcpp::R_X86_64_64:
3378 case elfcpp::R_X86_64_32:
3379 case elfcpp::R_X86_64_32S:
3380 case elfcpp::R_X86_64_16:
3381 case elfcpp::R_X86_64_8:
3382 return Symbol::ABSOLUTE_REF;
3383
3384 case elfcpp::R_X86_64_PC64:
3385 case elfcpp::R_X86_64_PC32:
f49fe902 3386 case elfcpp::R_X86_64_PC32_BND:
95a2c8d6
RS		 3387 case elfcpp::R_X86_64_PC16:
3388 case elfcpp::R_X86_64_PC8:
3389 case elfcpp::R_X86_64_GOTOFF64:
3390 return Symbol::RELATIVE_REF;
3391
3392 case elfcpp::R_X86_64_PLT32:
f49fe902 3393 case elfcpp::R_X86_64_PLT32_BND:
95a2c8d6
RS		 3394 case elfcpp::R_X86_64_PLTOFF64:
3395 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
3396
3397 case elfcpp::R_X86_64_GOT64:
3398 case elfcpp::R_X86_64_GOT32:
3399 case elfcpp::R_X86_64_GOTPCREL64:
3400 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3401 case elfcpp::R_X86_64_GOTPCRELX:
3402 case elfcpp::R_X86_64_REX_GOTPCRELX:
95a2c8d6
RS		 3403 case elfcpp::R_X86_64_GOTPLT64:
3404 // Absolute in GOT.
3405 return Symbol::ABSOLUTE_REF;
3406
3407 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3408 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3409 case elfcpp::R_X86_64_TLSDESC_CALL:
3410 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
3411 case elfcpp::R_X86_64_DTPOFF32:
3412 case elfcpp::R_X86_64_DTPOFF64:
3413 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3414 case elfcpp::R_X86_64_TPOFF32: // Local-exec
3415 return Symbol::TLS_REF;
3416
3417 case elfcpp::R_X86_64_COPY:
3418 case elfcpp::R_X86_64_GLOB_DAT:
3419 case elfcpp::R_X86_64_JUMP_SLOT:
3420 case elfcpp::R_X86_64_RELATIVE:
3421 case elfcpp::R_X86_64_IRELATIVE:
3422 case elfcpp::R_X86_64_TPOFF64:
3423 case elfcpp::R_X86_64_DTPMOD64:
3424 case elfcpp::R_X86_64_TLSDESC:
3425 case elfcpp::R_X86_64_SIZE32:
3426 case elfcpp::R_X86_64_SIZE64:
3427 default:
3428 // Not expected. We will give an error later.
3429 return 0;
3430 }
3431}
3432
e041f13d
ILT		 3433// Report an unsupported relocation against a local symbol.
3434
fc51264f 3435template<int size>
e041f13d 3436void
fc51264f
L		 3437Target_x86_64<size>::Scan::unsupported_reloc_local(
3438 Sized_relobj_file<size, false>* object,
6fa2a40b 3439 unsigned int r_type)
e041f13d 3440{
75f2446e
ILT		 3441 gold_error(_("%s: unsupported reloc %u against local symbol"),
3442 object->name().c_str(), r_type);
e041f13d
ILT		 3443}
3444
a036edd8
ILT		 3445// We are about to emit a dynamic relocation of type R_TYPE. If the
3446// dynamic linker does not support it, issue an error. The GNU linker
3447// only issues a non-PIC error for an allocated read-only section.
3448// Here we know the section is allocated, but we don't know that it is
3449// read-only. But we check for all the relocation types which the
3450// glibc dynamic linker supports, so it seems appropriate to issue an
a29b0dad
ILT		 3451// error even if the section is not read-only. If GSYM is not NULL,
3452// it is the symbol the relocation is against; if it is NULL, the
3453// relocation is against a local symbol.
a036edd8 3454
fc51264f 3455template<int size>
a036edd8 3456void
fc51264f
L		 3457Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
3458 Symbol* gsym)
a036edd8
ILT		 3459{
3460 switch (r_type)
3461 {
2fbb4320
ILT		 3462 // These are the relocation types supported by glibc for x86_64
3463 // which should always work.
a036edd8 3464 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3465 case elfcpp::R_X86_64_IRELATIVE:
a036edd8
ILT		 3466 case elfcpp::R_X86_64_GLOB_DAT:
3467 case elfcpp::R_X86_64_JUMP_SLOT:
3468 case elfcpp::R_X86_64_DTPMOD64:
3469 case elfcpp::R_X86_64_DTPOFF64:
3470 case elfcpp::R_X86_64_TPOFF64:
3471 case elfcpp::R_X86_64_64:
2fbb4320
ILT		 3472 case elfcpp::R_X86_64_COPY:
3473 return;
3474
3475 // glibc supports these reloc types, but they can overflow.
a036edd8 3476 case elfcpp::R_X86_64_PC32:
f49fe902 3477 case elfcpp::R_X86_64_PC32_BND:
a29b0dad
ILT		 3478 // A PC relative reference is OK against a local symbol or if
3479 // the symbol is defined locally.
3480 if (gsym == NULL
3481 || (!gsym->is_from_dynobj()
3482 && !gsym->is_undefined()
3483 && !gsym->is_preemptible()))
3484 return;
d8e90251 3485 // Fall through.
a29b0dad 3486 case elfcpp::R_X86_64_32:
3660ff06
L		 3487 // R_X86_64_32 is OK for x32.
3488 if (size == 32 && r_type == elfcpp::R_X86_64_32)
3489 return;
2fbb4320
ILT		 3490 if (this->issued_non_pic_error_)
3491 return;
3492 gold_assert(parameters->options().output_is_position_independent());
a29b0dad
ILT		 3493 if (gsym == NULL)
3494 object->error(_("requires dynamic R_X86_64_32 reloc which may "
3495 "overflow at runtime; recompile with -fPIC"));
3496 else
f49fe902
L		 3497 {
3498 const char *r_name;
3499 switch (r_type)
3500 {
3501 case elfcpp::R_X86_64_32:
3502 r_name = "R_X86_64_32";
3503 break;
3504 case elfcpp::R_X86_64_PC32:
3505 r_name = "R_X86_64_PC32";
3506 break;
3507 case elfcpp::R_X86_64_PC32_BND:
3508 r_name = "R_X86_64_PC32_BND";
3509 break;
3510 default:
3511 gold_unreachable();
3512 break;
3513 }
3514 object->error(_("requires dynamic %s reloc against '%s' "
3515 "which may overflow at runtime; recompile "
3516 "with -fPIC"),
3517 r_name, gsym->name());
3518 }
2fbb4320 3519 this->issued_non_pic_error_ = true;
a036edd8
ILT		 3520 return;
3521
3522 default:
3523 // This prevents us from issuing more than one error per reloc
3524 // section. But we can still wind up issuing more than one
3525 // error per object file.
3526 if (this->issued_non_pic_error_)
2e702c99 3527 return;
33aea2fd 3528 gold_assert(parameters->options().output_is_position_independent());
a29b0dad 3529 object->error(_("requires unsupported dynamic reloc %u; "
2e702c99 3530 "recompile with -fPIC"),
a29b0dad 3531 r_type);
a036edd8
ILT		 3532 this->issued_non_pic_error_ = true;
3533 return;
3534
3535 case elfcpp::R_X86_64_NONE:
3536 gold_unreachable();
3537 }
3538}
3539
7223e9ca
ILT		 3540// Return whether we need to make a PLT entry for a relocation of the
3541// given type against a STT_GNU_IFUNC symbol.
3542
fc51264f 3543template<int size>
7223e9ca 3544bool
fc51264f
L		 3545Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
3546 Sized_relobj_file<size, false>* object,
6fa2a40b 3547 unsigned int r_type)
7223e9ca 3548{
95a2c8d6
RS		 3549 int flags = Scan::get_reference_flags(r_type);
3550 if (flags & Symbol::TLS_REF)
3551 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2e702c99 3552 object->name().c_str(), r_type);
95a2c8d6 3553 return flags != 0;
7223e9ca
ILT		 3554}
3555
2e30d253
ILT		 3556// Scan a relocation for a local symbol.
3557
fc51264f 3558template<int size>
2e30d253 3559inline void
fc51264f
L		 3560Target_x86_64<size>::Scan::local(Symbol_table* symtab,
3561 Layout* layout,
3562 Target_x86_64<size>* target,
3563 Sized_relobj_file<size, false>* object,
3564 unsigned int data_shndx,
3565 Output_section* output_section,
3566 const elfcpp::Rela<size, false>& reloc,
3567 unsigned int r_type,
bfdfa4cd
AM		 3568 const elfcpp::Sym<size, false>& lsym,
3569 bool is_discarded)
2e30d253 3570{
bfdfa4cd
AM		 3571 if (is_discarded)
3572 return;
3573
7223e9ca 3574 // A local STT_GNU_IFUNC symbol may require a PLT entry.
397b129b
CC		 3575 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
3576 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
7223e9ca 3577 {
fc51264f 3578 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 3579 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
3580 }
3581
2e30d253
ILT		 3582 switch (r_type)
3583 {
3584 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 3585 case elfcpp::R_X86_64_GNU_VTINHERIT:
3586 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 3587 break;
3588
3589 case elfcpp::R_X86_64_64:
d61c6bd4 3590 // If building a shared library (or a position-independent
dceae3c1
ILT		 3591 // executable), we need to create a dynamic relocation for this
3592 // location. The relocation applied at link time will apply the
3593 // link-time value, so we flag the location with an
3594 // R_X86_64_RELATIVE relocation so the dynamic loader can
d61c6bd4 3595 // relocate it easily.
8851ecca 3596 if (parameters->options().output_is_position_independent())
2e702c99
RM		 3597 {
3598 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
3599 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca 3600 rela_dyn->add_local_relative(object, r_sym,
62fe925a 3601 (size == 32
fd885f3a
L		 3602 ? elfcpp::R_X86_64_RELATIVE64
3603 : elfcpp::R_X86_64_RELATIVE),
7223e9ca
ILT		 3604 output_section, data_shndx,
3605 reloc.get_r_offset(),
397b129b 3606 reloc.get_r_addend(), is_ifunc);
2e702c99 3607 }
d61c6bd4
ILT		 3608 break;
3609
2e30d253
ILT		 3610 case elfcpp::R_X86_64_32:
3611 case elfcpp::R_X86_64_32S:
3612 case elfcpp::R_X86_64_16:
3613 case elfcpp::R_X86_64_8:
96f2030e 3614 // If building a shared library (or a position-independent
dceae3c1
ILT		 3615 // executable), we need to create a dynamic relocation for this
3616 // location. We can't use an R_X86_64_RELATIVE relocation
3617 // because that is always a 64-bit relocation.
8851ecca 3618 if (parameters->options().output_is_position_independent())
2e702c99 3619 {
3660ff06
L		 3620 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
3621 if (size == 32 && r_type == elfcpp::R_X86_64_32)
3622 {
3623 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
3624 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
3625 rela_dyn->add_local_relative(object, r_sym,
3626 elfcpp::R_X86_64_RELATIVE,
3627 output_section, data_shndx,
3628 reloc.get_r_offset(),
3629 reloc.get_r_addend(), is_ifunc);
3630 break;
3631 }
3632
2e702c99 3633 this->check_non_pic(object, r_type, NULL);
a036edd8 3634
2e702c99 3635 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
fc51264f 3636 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2e702c99 3637 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 3638 rela_dyn->add_local(object, r_sym, r_type, output_section,
3639 data_shndx, reloc.get_r_offset(),
3640 reloc.get_r_addend());
2e702c99
RM		 3641 else
3642 {
3643 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 3644 unsigned int shndx = lsym.get_st_shndx();
3645 bool is_ordinary;
3646 shndx = object->adjust_sym_shndx(r_sym, shndx,
3647 &is_ordinary);
3648 if (!is_ordinary)
3649 object->error(_("section symbol %u has bad shndx %u"),
3650 r_sym, shndx);
3651 else
3652 rela_dyn->add_local_section(object, shndx,
3653 r_type, output_section,
3654 data_shndx, reloc.get_r_offset(),
3655 reloc.get_r_addend());
2e702c99
RM		 3656 }
3657 }
2e30d253
ILT		 3658 break;
3659
3660 case elfcpp::R_X86_64_PC64:
3661 case elfcpp::R_X86_64_PC32:
f49fe902 3662 case elfcpp::R_X86_64_PC32_BND:
2e30d253
ILT		 3663 case elfcpp::R_X86_64_PC16:
3664 case elfcpp::R_X86_64_PC8:
3665 break;
3666
f389a824 3667 case elfcpp::R_X86_64_PLT32:
f49fe902 3668 case elfcpp::R_X86_64_PLT32_BND:
f389a824
ILT		 3669 // Since we know this is a local symbol, we can handle this as a
3670 // PC32 reloc.
3671 break;
3672
fdc2f80f 3673 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 3674 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 3675 case elfcpp::R_X86_64_GOTPC64:
3676 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 3677 // We need a GOT section.
3678 target->got_section(symtab, layout);
ee9e9e86
ILT		 3679 // For PLTOFF64, we'd normally want a PLT section, but since we
3680 // know this is a local symbol, no PLT is needed.
2e30d253
ILT		 3681 break;
3682
0ffd9845
ILT		 3683 case elfcpp::R_X86_64_GOT64:
3684 case elfcpp::R_X86_64_GOT32:
3685 case elfcpp::R_X86_64_GOTPCREL64:
3686 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3687 case elfcpp::R_X86_64_GOTPCRELX:
3688 case elfcpp::R_X86_64_REX_GOTPCRELX:
ee9e9e86 3689 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845 3690 {
1fa29f10 3691 // The symbol requires a GOT section.
2e702c99 3692 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 3693
3694 // If the relocation symbol isn't IFUNC,
3695 // and is local, then we will convert
3696 // mov foo@GOTPCREL(%rip), %reg
3697 // to lea foo(%rip), %reg.
3698 // in Relocate::relocate.
158600eb
CC		 3699 if (!parameters->incremental()
3700 && (r_type == elfcpp::R_X86_64_GOTPCREL
3701 || r_type == elfcpp::R_X86_64_GOTPCRELX
3702 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
1fa29f10
IT		 3703 && reloc.get_r_offset() >= 2
3704 && !is_ifunc)
3705 {
3706 section_size_type stype;
3707 const unsigned char* view = object->section_contents(data_shndx,
3708 &stype, true);
3709 if (view[reloc.get_r_offset() - 2] == 0x8b)
3710 break;
3711 }
3712
1fa29f10 3713 // The symbol requires a GOT entry.
2e702c99 3714 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 3715
3716 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
3717 // lets function pointers compare correctly with shared
3718 // libraries. Otherwise we would need an IRELATIVE reloc.
3719 bool is_new;
397b129b 3720 if (is_ifunc)
7223e9ca
ILT		 3721 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
3722 else
3723 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2e702c99
RM		 3724 if (is_new)
3725 {
3726 // If we are generating a shared object, we need to add a
3727 // dynamic relocation for this symbol's GOT entry.
3728 if (parameters->options().output_is_position_independent())
3729 {
3730 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7bf1f802
ILT		 3731 // R_X86_64_RELATIVE assumes a 64-bit relocation.
3732 if (r_type != elfcpp::R_X86_64_GOT32)
7223e9ca
ILT		 3733 {
3734 unsigned int got_offset =
3735 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
3736 rela_dyn->add_local_relative(object, r_sym,
3737 elfcpp::R_X86_64_RELATIVE,
397b129b 3738 got, got_offset, 0, is_ifunc);
7223e9ca 3739 }
2e702c99
RM		 3740 else
3741 {
3742 this->check_non_pic(object, r_type, NULL);
3743
3744 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
3745 rela_dyn->add_local(
3746 object, r_sym, r_type, got,
3747 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
3748 }
3749 }
3750 }
3751 // For GOTPLT64, we'd normally want a PLT section, but since
3752 // we know this is a local symbol, no PLT is needed.
0ffd9845
ILT		 3753 }
3754 break;
3755
2e30d253
ILT		 3756 case elfcpp::R_X86_64_COPY:
3757 case elfcpp::R_X86_64_GLOB_DAT:
3758 case elfcpp::R_X86_64_JUMP_SLOT:
3759 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3760 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3761 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 3762 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3763 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 3764 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3765 gold_error(_("%s: unexpected reloc %u in object file"),
3766 object->name().c_str(), r_type);
2e30d253
ILT		 3767 break;
3768
d61c17ea 3769 // These are initial tls relocs, which are expected when linking
56622147
ILT		 3770 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3771 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3772 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3773 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3774 case elfcpp::R_X86_64_DTPOFF32:
3775 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3776 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3777 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 3778 {
8851ecca 3779 bool output_is_shared = parameters->options().shared();
e041f13d 3780 const tls::Tls_optimization optimized_type
2e702c99 3781 = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
fc51264f 3782 r_type);
2e30d253
ILT		 3783 switch (r_type)
3784 {
2e702c99
RM		 3785 case elfcpp::R_X86_64_TLSGD: // General-dynamic
3786 if (optimized_type == tls::TLSOPT_NONE)
3787 {
3788 // Create a pair of GOT entries for the module index and
3789 // dtv-relative offset.
3790 Output_data_got<64, false>* got
3791 = target->got_section(symtab, layout);
3792 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
d491d34e
ILT		 3793 unsigned int shndx = lsym.get_st_shndx();
3794 bool is_ordinary;
3795 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
3796 if (!is_ordinary)
3797 object->error(_("local symbol %u has bad shndx %u"),
3798 r_sym, shndx);
2e702c99 3799 else
83896202
ILT		 3800 got->add_local_pair_with_rel(object, r_sym,
3801 shndx,
3802 GOT_TYPE_TLS_PAIR,
3803 target->rela_dyn_section(layout),
bd73a62d 3804 elfcpp::R_X86_64_DTPMOD64);
2e702c99
RM		 3805 }
3806 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 3807 unsupported_reloc_local(object, r_type);
2e702c99 3808 break;
7bf1f802 3809
2e702c99
RM		 3810 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3811 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 3812 if (optimized_type == tls::TLSOPT_NONE)
3813 {
2e702c99
RM		 3814 // Create reserved PLT and GOT entries for the resolver.
3815 target->reserve_tlsdesc_entries(symtab, layout);
3816
3817 // Generate a double GOT entry with an
3818 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
3819 // is resolved lazily, so the GOT entry needs to be in
3820 // an area in .got.plt, not .got. Call got_section to
3821 // make sure the section has been created.
a8df5856 3822 target->got_section(symtab, layout);
2e702c99
RM		 3823 Output_data_got<64, false>* got = target->got_tlsdesc_section();
3824 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
e291e7b9
ILT		 3825 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
3826 {
3827 unsigned int got_offset = got->add_constant(0);
3828 got->add_constant(0);
3829 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
3830 got_offset);
3831 Reloc_section* rt = target->rela_tlsdesc_section(layout);
3832 // We store the arguments we need in a vector, and
3833 // use the index into the vector as the parameter
3834 // to pass to the target specific routines.
3835 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
3836 void* arg = reinterpret_cast<void*>(intarg);
3837 rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
3838 got, got_offset, 0);
3839 }
c2b45e22
CC		 3840 }
3841 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 3842 unsupported_reloc_local(object, r_type);
2e30d253
ILT		 3843 break;
3844
2e702c99 3845 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 3846 break;
3847
2e702c99 3848 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 3849 if (optimized_type == tls::TLSOPT_NONE)
3850 {
2e702c99
RM		 3851 // Create a GOT entry for the module index.
3852 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 3853 }
3854 else if (optimized_type != tls::TLSOPT_TO_LE)
3855 unsupported_reloc_local(object, r_type);
3856 break;
3857
2e702c99
RM		 3858 case elfcpp::R_X86_64_DTPOFF32:
3859 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 3860 break;
3861
2e702c99 3862 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 3863 layout->set_has_static_tls();
2e702c99
RM		 3864 if (optimized_type == tls::TLSOPT_NONE)
3865 {
3866 // Create a GOT entry for the tp-relative offset.
3867 Output_data_got<64, false>* got
3868 = target->got_section(symtab, layout);
3869 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
3870 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3871 target->rela_dyn_section(layout),
3872 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 3873 }
3874 else if (optimized_type != tls::TLSOPT_TO_LE)
3875 unsupported_reloc_local(object, r_type);
3876 break;
0ffd9845 3877
2e702c99 3878 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 3879 layout->set_has_static_tls();
2e702c99
RM		 3880 if (output_is_shared)
3881 unsupported_reloc_local(object, r_type);
2e30d253 3882 break;
e041f13d 3883
2e702c99
RM		 3884 default:
3885 gold_unreachable();
2e30d253
ILT		 3886 }
3887 }
3888 break;
2e30d253 3889
fdc2f80f
ILT		 3890 case elfcpp::R_X86_64_SIZE32:
3891 case elfcpp::R_X86_64_SIZE64:
2e30d253 3892 default:
75f2446e
ILT		 3893 gold_error(_("%s: unsupported reloc %u against local symbol"),
3894 object->name().c_str(), r_type);
2e30d253
ILT		 3895 break;
3896 }
3897}
3898
3899
e041f13d
ILT		 3900// Report an unsupported relocation against a global symbol.
3901
fc51264f 3902template<int size>
e041f13d 3903void
fc51264f
L		 3904Target_x86_64<size>::Scan::unsupported_reloc_global(
3905 Sized_relobj_file<size, false>* object,
6fa2a40b
CC		 3906 unsigned int r_type,
3907 Symbol* gsym)
e041f13d 3908{
75f2446e 3909 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 3910 object->name().c_str(), r_type, gsym->demangled_name().c_str());
e041f13d
ILT		 3911}
3912
ce97fa81 3913// Returns true if this relocation type could be that of a function pointer.
fc51264f 3914template<int size>
21bb3914 3915inline bool
4aebb631
RC		 3916Target_x86_64<size>::Scan::possible_function_pointer_reloc(
3917 Sized_relobj_file<size, false>* src_obj,
3918 unsigned int src_indx,
3919 unsigned int r_offset,
3920 unsigned int r_type)
21bb3914 3921{
21bb3914
ST		 3922 switch (r_type)
3923 {
3924 case elfcpp::R_X86_64_64:
3925 case elfcpp::R_X86_64_32:
3926 case elfcpp::R_X86_64_32S:
3927 case elfcpp::R_X86_64_16:
3928 case elfcpp::R_X86_64_8:
ce97fa81
ST		 3929 case elfcpp::R_X86_64_GOT64:
3930 case elfcpp::R_X86_64_GOT32:
3931 case elfcpp::R_X86_64_GOTPCREL64:
3932 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3933 case elfcpp::R_X86_64_GOTPCRELX:
3934 case elfcpp::R_X86_64_REX_GOTPCRELX:
ce97fa81 3935 case elfcpp::R_X86_64_GOTPLT64:
21bb3914 3936 {
2e702c99 3937 return true;
21bb3914 3938 }
4aebb631
RC		 3939 case elfcpp::R_X86_64_PC32:
3940 {
3941 // This relocation may be used both for function calls and
3942 // for taking address of a function. We distinguish between
3943 // them by checking the opcodes.
3944 uint64_t sh_flags = src_obj->section_flags(src_indx);
3945 bool is_executable = (sh_flags & elfcpp::SHF_EXECINSTR) != 0;
3946 if (is_executable)
3947 {
3948 section_size_type stype;
3949 const unsigned char* view = src_obj->section_contents(src_indx,
3950 &stype,
3951 true);
3952
3953 // call
3954 if (r_offset >= 1
3955 && view[r_offset - 1] == 0xe8)
3956 return false;
3957
3958 // jmp
3959 if (r_offset >= 1
3960 && view[r_offset - 1] == 0xe9)
3961 return false;
3962
3963 // jo/jno/jb/jnb/je/jne/jna/ja/js/jns/jp/jnp/jl/jge/jle/jg
3964 if (r_offset >= 2
3965 && view[r_offset - 2] == 0x0f
3966 && view[r_offset - 1] >= 0x80
3967 && view[r_offset - 1] <= 0x8f)
3968 return false;
3969 }
3970
3971 // Be conservative and treat all others as function pointers.
3972 return true;
3973 }
21bb3914
ST		 3974 }
3975 return false;
3976}
3977
3978// For safe ICF, scan a relocation for a local symbol to check if it
3979// corresponds to a function pointer being taken. In that case mark
3980// the function whose pointer was taken as not foldable.
3981
fc51264f 3982template<int size>
21bb3914 3983inline bool
fc51264f 3984Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
21bb3914
ST		 3985 Symbol_table* ,
3986 Layout* ,
fc51264f 3987 Target_x86_64<size>* ,
4aebb631
RC		 3988 Sized_relobj_file<size, false>* src_obj,
3989 unsigned int src_indx,
21bb3914 3990 Output_section* ,
4aebb631 3991 const elfcpp::Rela<size, false>& reloc,
21bb3914 3992 unsigned int r_type,
fc51264f 3993 const elfcpp::Sym<size, false>&)
21bb3914
ST		 3994{
3995 // When building a shared library, do not fold any local symbols as it is
3996 // not possible to distinguish pointer taken versus a call by looking at
3997 // the relocation types.
4aebb631
RC		 3998 if (parameters->options().shared())
3999 return true;
4000
4001 return possible_function_pointer_reloc(src_obj, src_indx,
4002 reloc.get_r_offset(), r_type);
21bb3914
ST		 4003}
4004
4005// For safe ICF, scan a relocation for a global symbol to check if it
4006// corresponds to a function pointer being taken. In that case mark
4007// the function whose pointer was taken as not foldable.
4008
fc51264f 4009template<int size>
21bb3914 4010inline bool
fc51264f 4011Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
21bb3914
ST		 4012 Symbol_table*,
4013 Layout* ,
fc51264f 4014 Target_x86_64<size>* ,
4aebb631
RC		 4015 Sized_relobj_file<size, false>* src_obj,
4016 unsigned int src_indx,
21bb3914 4017 Output_section* ,
4aebb631 4018 const elfcpp::Rela<size, false>& reloc,
21bb3914
ST		 4019 unsigned int r_type,
4020 Symbol* gsym)
4021{
4022 // When building a shared library, do not fold symbols whose visibility
4023 // is hidden, internal or protected.
4aebb631
RC		 4024 if (parameters->options().shared()
4025 && (gsym->visibility() == elfcpp::STV_INTERNAL
4026 || gsym->visibility() == elfcpp::STV_PROTECTED
4027 || gsym->visibility() == elfcpp::STV_HIDDEN))
4028 return true;
4029
4030 return possible_function_pointer_reloc(src_obj, src_indx,
4031 reloc.get_r_offset(), r_type);
21bb3914
ST		 4032}
4033
2e30d253
ILT		 4034// Scan a relocation for a global symbol.
4035
fc51264f 4036template<int size>
2e30d253 4037inline void
fc51264f 4038Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2e702c99
RM		 4039 Layout* layout,
4040 Target_x86_64<size>* target,
4041 Sized_relobj_file<size, false>* object,
4042 unsigned int data_shndx,
4043 Output_section* output_section,
4044 const elfcpp::Rela<size, false>& reloc,
4045 unsigned int r_type,
4046 Symbol* gsym)
2e30d253 4047{
7223e9ca
ILT		 4048 // A STT_GNU_IFUNC symbol may require a PLT entry.
4049 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4050 && this->reloc_needs_plt_for_ifunc(object, r_type))
4051 target->make_plt_entry(symtab, layout, gsym);
4052
2e30d253
ILT		 4053 switch (r_type)
4054 {
4055 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 4056 case elfcpp::R_X86_64_GNU_VTINHERIT:
4057 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 4058 break;
4059
4060 case elfcpp::R_X86_64_64:
2e30d253
ILT		 4061 case elfcpp::R_X86_64_32:
4062 case elfcpp::R_X86_64_32S:
2e30d253 4063 case elfcpp::R_X86_64_16:
2e30d253 4064 case elfcpp::R_X86_64_8:
96f2030e 4065 {
2e702c99
RM		 4066 // Make a PLT entry if necessary.
4067 if (gsym->needs_plt_entry())
4068 {
4069 target->make_plt_entry(symtab, layout, gsym);
4070 // Since this is not a PC-relative relocation, we may be
4071 // taking the address of a function. In that case we need to
4072 // set the entry in the dynamic symbol table to the address of
4073 // the PLT entry.
4074 if (gsym->is_from_dynobj() && !parameters->options().shared())
4075 gsym->set_needs_dynsym_value();
4076 }
4077 // Make a dynamic relocation if necessary.
4078 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
4079 {
a82bef93
ST		 4080 if (!parameters->options().output_is_position_independent()
4081 && gsym->may_need_copy_reloc())
2e702c99
RM		 4082 {
4083 target->copy_reloc(symtab, layout, object,
4084 data_shndx, output_section, gsym, reloc);
4085 }
1bae613c
L		 4086 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
4087 || (size == 32 && r_type == elfcpp::R_X86_64_32))
7223e9ca
ILT		 4088 && gsym->type() == elfcpp::STT_GNU_IFUNC
4089 && gsym->can_use_relative_reloc(false)
4090 && !gsym->is_from_dynobj()
4091 && !gsym->is_undefined()
4092 && !gsym->is_preemptible())
4093 {
4094 // Use an IRELATIVE reloc for a locally defined
4095 // STT_GNU_IFUNC symbol. This makes a function
4096 // address in a PIE executable match the address in a
4097 // shared library that it links against.
67181c72
ILT		 4098 Reloc_section* rela_dyn =
4099 target->rela_irelative_section(layout);
7223e9ca
ILT		 4100 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
4101 rela_dyn->add_symbolless_global_addend(gsym, r_type,
4102 output_section, object,
4103 data_shndx,
4104 reloc.get_r_offset(),
4105 reloc.get_r_addend());
4106 }
b14016f0
L		 4107 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
4108 || (size == 32 && r_type == elfcpp::R_X86_64_32))
2e702c99
RM		 4109 && gsym->can_use_relative_reloc(false))
4110 {
4111 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca
ILT		 4112 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
4113 output_section, object,
4114 data_shndx,
4115 reloc.get_r_offset(),
13cf9988 4116 reloc.get_r_addend(), false);
2e702c99
RM		 4117 }
4118 else
4119 {
4120 this->check_non_pic(object, r_type, gsym);
4121 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
4122 rela_dyn->add_global(gsym, r_type, output_section, object,
4123 data_shndx, reloc.get_r_offset(),
4124 reloc.get_r_addend());
4125 }
4126 }
d61c6bd4
ILT		 4127 }
4128 break;
4129
4130 case elfcpp::R_X86_64_PC64:
4131 case elfcpp::R_X86_64_PC32:
f49fe902 4132 case elfcpp::R_X86_64_PC32_BND:
d61c6bd4
ILT		 4133 case elfcpp::R_X86_64_PC16:
4134 case elfcpp::R_X86_64_PC8:
4135 {
2e702c99
RM		 4136 // Make a PLT entry if necessary.
4137 if (gsym->needs_plt_entry())
4138 target->make_plt_entry(symtab, layout, gsym);
4139 // Make a dynamic relocation if necessary.
4140 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
4141 {
a82bef93
ST		 4142 if (parameters->options().output_is_executable()
4143 && gsym->may_need_copy_reloc())
2e702c99
RM		 4144 {
4145 target->copy_reloc(symtab, layout, object,
4146 data_shndx, output_section, gsym, reloc);
4147 }
4148 else
4149 {
4150 this->check_non_pic(object, r_type, gsym);
4151 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
4152 rela_dyn->add_global(gsym, r_type, output_section, object,
4153 data_shndx, reloc.get_r_offset(),
4154 reloc.get_r_addend());
4155 }
4156 }
d61c6bd4 4157 }
2e30d253
ILT		 4158 break;
4159
ff006520 4160 case elfcpp::R_X86_64_GOT64:
2e30d253 4161 case elfcpp::R_X86_64_GOT32:
ff006520
ILT		 4162 case elfcpp::R_X86_64_GOTPCREL64:
4163 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 4164 case elfcpp::R_X86_64_GOTPCRELX:
4165 case elfcpp::R_X86_64_REX_GOTPCRELX:
ff006520 4166 case elfcpp::R_X86_64_GOTPLT64:
2e30d253 4167 {
2e702c99
RM		 4168 // The symbol requires a GOT entry.
4169 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 4170
4171 // If we convert this from
4172 // mov foo@GOTPCREL(%rip), %reg
4173 // to lea foo(%rip), %reg.
3a4f096e
ST		 4174 // OR
4175 // if we convert
4176 // (callq|jmpq) *foo@GOTPCRELX(%rip) to
4177 // (callq|jmpq) foo
1fa29f10 4178 // in Relocate::relocate, then there is nothing to do here.
158600eb
CC		 4179 // We cannot make these optimizations in incremental linking mode,
4180 // because we look at the opcode to decide whether or not to make
4181 // change, and during an incremental update, the change may have
4182 // already been applied.
3a4f096e
ST		 4183
4184 Lazy_view<size> view(object, data_shndx);
4185 size_t r_offset = reloc.get_r_offset();
158600eb
CC		 4186 if (!parameters->incremental()
4187 && r_offset >= 2
3a4f096e
ST		 4188 && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
4189 r_offset, &view))
4190 break;
4191
158600eb
CC		 4192 if (!parameters->incremental()
4193 && r_offset >= 2
3a4f096e
ST		 4194 && Target_x86_64<size>::can_convert_callq_to_direct(gsym, r_type,
4195 r_offset,
4196 &view))
4197 break;
1fa29f10 4198
2e702c99 4199 if (gsym->final_value_is_known())
7223e9ca
ILT		 4200 {
4201 // For a STT_GNU_IFUNC symbol we want the PLT address.
4202 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
4203 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
4204 else
4205 got->add_global(gsym, GOT_TYPE_STANDARD);
4206 }
2e702c99
RM		 4207 else
4208 {
4209 // If this symbol is not fully resolved, we need to add a
4210 // dynamic relocation for it.
4211 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
07aa62f2
ILT		 4212
4213 // Use a GLOB_DAT rather than a RELATIVE reloc if:
4214 //
4215 // 1) The symbol may be defined in some other module.
4216 //
4217 // 2) We are building a shared library and this is a
4218 // protected symbol; using GLOB_DAT means that the dynamic
4219 // linker can use the address of the PLT in the main
4220 // executable when appropriate so that function address
4221 // comparisons work.
4222 //
4223 // 3) This is a STT_GNU_IFUNC symbol in position dependent
4224 // code, again so that function address comparisons work.
7223e9ca
ILT		 4225 if (gsym->is_from_dynobj()
4226 || gsym->is_undefined()
4227 || gsym->is_preemptible()
07aa62f2
ILT		 4228 || (gsym->visibility() == elfcpp::STV_PROTECTED
4229 && parameters->options().shared())
7223e9ca
ILT		 4230 || (gsym->type() == elfcpp::STT_GNU_IFUNC
4231 && parameters->options().output_is_position_independent()))
2e702c99 4232 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
83896202 4233 elfcpp::R_X86_64_GLOB_DAT);
2e702c99
RM		 4234 else
4235 {
7223e9ca
ILT		 4236 // For a STT_GNU_IFUNC symbol we want to write the PLT
4237 // offset into the GOT, so that function pointer
4238 // comparisons work correctly.
4239 bool is_new;
4240 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
4241 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
4242 else
4243 {
4244 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
4245 // Tell the dynamic linker to use the PLT address
4246 // when resolving relocations.
4247 if (gsym->is_from_dynobj()
4248 && !parameters->options().shared())
4249 gsym->set_needs_dynsym_value();
4250 }
2e702c99 4251 if (is_new)
7223e9ca
ILT		 4252 {
4253 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
4254 rela_dyn->add_global_relative(gsym,
4255 elfcpp::R_X86_64_RELATIVE,
13cf9988 4256 got, got_off, 0, false);
7223e9ca 4257 }
2e702c99
RM		 4258 }
4259 }
2e30d253
ILT		 4260 }
4261 break;
4262
4263 case elfcpp::R_X86_64_PLT32:
f49fe902 4264 case elfcpp::R_X86_64_PLT32_BND:
2e30d253
ILT		 4265 // If the symbol is fully resolved, this is just a PC32 reloc.
4266 // Otherwise we need a PLT entry.
4267 if (gsym->final_value_is_known())
4268 break;
96f2030e
ILT		 4269 // If building a shared library, we can also skip the PLT entry
4270 // if the symbol is defined in the output file and is protected
4271 // or hidden.
4272 if (gsym->is_defined()
2e702c99
RM		 4273 && !gsym->is_from_dynobj()
4274 && !gsym->is_preemptible())
96f2030e 4275 break;
2e30d253
ILT		 4276 target->make_plt_entry(symtab, layout, gsym);
4277 break;
4278
fdc2f80f 4279 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 4280 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 4281 case elfcpp::R_X86_64_GOTPC64:
4282 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 4283 // We need a GOT section.
4284 target->got_section(symtab, layout);
ee9e9e86
ILT		 4285 // For PLTOFF64, we also need a PLT entry (but only if the
4286 // symbol is not fully resolved).
4287 if (r_type == elfcpp::R_X86_64_PLTOFF64
4288 && !gsym->final_value_is_known())
4289 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 4290 break;
4291
2e30d253
ILT		 4292 case elfcpp::R_X86_64_COPY:
4293 case elfcpp::R_X86_64_GLOB_DAT:
4294 case elfcpp::R_X86_64_JUMP_SLOT:
4295 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 4296 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 4297 // These are outstanding tls relocs, which are unexpected when linking
e822f2b1 4298 case elfcpp::R_X86_64_TPOFF64:
2e30d253 4299 case elfcpp::R_X86_64_DTPMOD64:
e822f2b1 4300 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 4301 gold_error(_("%s: unexpected reloc %u in object file"),
4302 object->name().c_str(), r_type);
2e30d253 4303 break;
2e30d253 4304
d61c17ea 4305 // These are initial tls relocs, which are expected for global()
56622147
ILT		 4306 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
4307 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 4308 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 4309 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 4310 case elfcpp::R_X86_64_DTPOFF32:
4311 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 4312 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
4313 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 4314 {
65d92137
CC		 4315 // For the Initial-Exec model, we can treat undef symbols as final
4316 // when building an executable.
4317 const bool is_final = (gsym->final_value_is_known() ||
4318 (r_type == elfcpp::R_X86_64_GOTTPOFF &&
4319 gsym->is_undefined() &&
4320 parameters->options().output_is_executable()));
e041f13d 4321 const tls::Tls_optimization optimized_type
2e702c99 4322 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 4323 switch (r_type)
4324 {
2e702c99 4325 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 4326 if (optimized_type == tls::TLSOPT_NONE)
4327 {
2e702c99
RM		 4328 // Create a pair of GOT entries for the module index and
4329 // dtv-relative offset.
4330 Output_data_got<64, false>* got
4331 = target->got_section(symtab, layout);
4332 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
83896202
ILT		 4333 target->rela_dyn_section(layout),
4334 elfcpp::R_X86_64_DTPMOD64,
4335 elfcpp::R_X86_64_DTPOFF64);
7bf1f802
ILT		 4336 }
4337 else if (optimized_type == tls::TLSOPT_TO_IE)
4338 {
2e702c99
RM		 4339 // Create a GOT entry for the tp-relative offset.
4340 Output_data_got<64, false>* got
4341 = target->got_section(symtab, layout);
4342 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 4343 target->rela_dyn_section(layout),
4344 elfcpp::R_X86_64_TPOFF64);
7bf1f802
ILT		 4345 }
4346 else if (optimized_type != tls::TLSOPT_TO_LE)
4347 unsupported_reloc_global(object, r_type, gsym);
4348 break;
4349
2e702c99
RM		 4350 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
4351 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 4352 if (optimized_type == tls::TLSOPT_NONE)
4353 {
2e702c99
RM		 4354 // Create reserved PLT and GOT entries for the resolver.
4355 target->reserve_tlsdesc_entries(symtab, layout);
4356
4357 // Create a double GOT entry with an R_X86_64_TLSDESC
4358 // reloc. The R_X86_64_TLSDESC reloc is resolved
4359 // lazily, so the GOT entry needs to be in an area in
4360 // .got.plt, not .got. Call got_section to make sure
4361 // the section has been created.
a8df5856 4362 target->got_section(symtab, layout);
2e702c99 4363 Output_data_got<64, false>* got = target->got_tlsdesc_section();
ca09d69a 4364 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2e702c99 4365 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
83896202 4366 elfcpp::R_X86_64_TLSDESC, 0);
c2b45e22
CC		 4367 }
4368 else if (optimized_type == tls::TLSOPT_TO_IE)
4369 {
2e702c99
RM		 4370 // Create a GOT entry for the tp-relative offset.
4371 Output_data_got<64, false>* got
4372 = target->got_section(symtab, layout);
4373 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 4374 target->rela_dyn_section(layout),
4375 elfcpp::R_X86_64_TPOFF64);
c2b45e22
CC		 4376 }
4377 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 4378 unsupported_reloc_global(object, r_type, gsym);
2e30d253
ILT		 4379 break;
4380
2e702c99 4381 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 4382 break;
4383
2e702c99 4384 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 4385 if (optimized_type == tls::TLSOPT_NONE)
4386 {
2e702c99
RM		 4387 // Create a GOT entry for the module index.
4388 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 4389 }
4390 else if (optimized_type != tls::TLSOPT_TO_LE)
4391 unsupported_reloc_global(object, r_type, gsym);
4392 break;
4393
2e702c99
RM		 4394 case elfcpp::R_X86_64_DTPOFF32:
4395 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 4396 break;
4397
2e702c99 4398 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 4399 layout->set_has_static_tls();
2e702c99
RM		 4400 if (optimized_type == tls::TLSOPT_NONE)
4401 {
4402 // Create a GOT entry for the tp-relative offset.
4403 Output_data_got<64, false>* got
4404 = target->got_section(symtab, layout);
4405 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 4406 target->rela_dyn_section(layout),
4407 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 4408 }
4409 else if (optimized_type != tls::TLSOPT_TO_LE)
4410 unsupported_reloc_global(object, r_type, gsym);
4411 break;
0ffd9845 4412
2e702c99 4413 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 4414 layout->set_has_static_tls();
2e702c99 4415 if (parameters->options().shared())
b1759dce 4416 unsupported_reloc_global(object, r_type, gsym);
2e30d253 4417 break;
e041f13d 4418
2e702c99
RM		 4419 default:
4420 gold_unreachable();
2e30d253
ILT		 4421 }
4422 }
4423 break;
fdc2f80f
ILT		 4424
4425 case elfcpp::R_X86_64_SIZE32:
4426 case elfcpp::R_X86_64_SIZE64:
2e30d253 4427 default:
75f2446e 4428 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 4429 object->name().c_str(), r_type,
2e702c99 4430 gsym->demangled_name().c_str());
2e30d253
ILT		 4431 break;
4432 }
4433}
4434
fc51264f 4435template<int size>
6d03d481 4436void
fc51264f
L		 4437Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
4438 Layout* layout,
4439 Sized_relobj_file<size, false>* object,
4440 unsigned int data_shndx,
4441 unsigned int sh_type,
4442 const unsigned char* prelocs,
4443 size_t reloc_count,
4444 Output_section* output_section,
4445 bool needs_special_offset_handling,
4446 size_t local_symbol_count,
4447 const unsigned char* plocal_symbols)
6d03d481 4448{
4d625b70
CC		 4449 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4450 Classify_reloc;
6d03d481
ST		 4451
4452 if (sh_type == elfcpp::SHT_REL)
4453 {
4454 return;
4455 }
4456
4d625b70
CC		 4457 gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan,
4458 Classify_reloc>(
6d03d481
ST		 4459 symtab,
4460 layout,
4461 this,
4462 object,
4463 data_shndx,
4464 prelocs,
4465 reloc_count,
4466 output_section,
4467 needs_special_offset_handling,
4468 local_symbol_count,
4469 plocal_symbols);
2e702c99 4470
6d03d481 4471}
2e30d253
ILT		 4472// Scan relocations for a section.
4473
fc51264f 4474template<int size>
2e30d253 4475void
fc51264f
L		 4476Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
4477 Layout* layout,
4478 Sized_relobj_file<size, false>* object,
4479 unsigned int data_shndx,
4480 unsigned int sh_type,
4481 const unsigned char* prelocs,
4482 size_t reloc_count,
4483 Output_section* output_section,
4484 bool needs_special_offset_handling,
4485 size_t local_symbol_count,
4486 const unsigned char* plocal_symbols)
2e30d253 4487{
4d625b70
CC		 4488 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4489 Classify_reloc;
4490
2e30d253
ILT		 4491 if (sh_type == elfcpp::SHT_REL)
4492 {
75f2446e
ILT		 4493 gold_error(_("%s: unsupported REL reloc section"),
4494 object->name().c_str());
4495 return;
2e30d253
ILT		 4496 }
4497
4d625b70 4498 gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>(
2e30d253
ILT		 4499 symtab,
4500 layout,
4501 this,
4502 object,
4503 data_shndx,
4504 prelocs,
4505 reloc_count,
730cdc88
ILT		 4506 output_section,
4507 needs_special_offset_handling,
2e30d253 4508 local_symbol_count,
730cdc88 4509 plocal_symbols);
2e30d253
ILT		 4510}
4511
4512// Finalize the sections.
4513
fc51264f 4514template<int size>
2e30d253 4515void
fc51264f 4516Target_x86_64<size>::do_finalize_sections(
f59f41f3
DK		 4517 Layout* layout,
4518 const Input_objects*,
e785ec03 4519 Symbol_table* symtab)
2e30d253 4520{
ea715a34
ILT		 4521 const Reloc_section* rel_plt = (this->plt_ == NULL
4522 ? NULL
e291e7b9 4523 : this->plt_->rela_plt());
ea715a34 4524 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
612a8d3d 4525 this->rela_dyn_, true, false);
2e702c99 4526
2e30d253
ILT		 4527 // Fill in some more dynamic tags.
4528 Output_data_dynamic* const odyn = layout->dynamic_data();
4529 if (odyn != NULL)
4530 {
22b127cc 4531 if (this->plt_ != NULL
ea715a34
ILT		 4532 && this->plt_->output_section() != NULL
4533 && this->plt_->has_tlsdesc_entry())
2e30d253 4534 {
ea715a34
ILT		 4535 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
4536 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
4537 this->got_->finalize_data_size();
4538 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
4539 this->plt_, plt_offset);
4540 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
4541 this->got_, got_offset);
2e30d253
ILT		 4542 }
4543 }
4544
4545 // Emit any relocs we saved in an attempt to avoid generating COPY
4546 // relocs.
12c0daef
ILT		 4547 if (this->copy_relocs_.any_saved_relocs())
4548 this->copy_relocs_.emit(this->rela_dyn_section(layout));
e785ec03
ILT		 4549
4550 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
4551 // the .got.plt section.
4552 Symbol* sym = this->global_offset_table_;
4553 if (sym != NULL)
4554 {
4555 uint64_t data_size = this->got_plt_->current_data_size();
fc51264f 4556 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
e785ec03 4557 }
28a13fec 4558
67181c72
ILT		 4559 if (parameters->doing_static_link()
4560 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
28a13fec
ILT		 4561 {
4562 // If linking statically, make sure that the __rela_iplt symbols
4563 // were defined if necessary, even if we didn't create a PLT.
4564 static const Define_symbol_in_segment syms[] =
4565 {
4566 {
4567 "__rela_iplt_start", // name
4568 elfcpp::PT_LOAD, // segment_type
4569 elfcpp::PF_W, // segment_flags_set
4570 elfcpp::PF(0), // segment_flags_clear
4571 0, // value
4572 0, // size
4573 elfcpp::STT_NOTYPE, // type
4574 elfcpp::STB_GLOBAL, // binding
4575 elfcpp::STV_HIDDEN, // visibility
4576 0, // nonvis
4577 Symbol::SEGMENT_START, // offset_from_base
4578 true // only_if_ref
4579 },
4580 {
4581 "__rela_iplt_end", // name
4582 elfcpp::PT_LOAD, // segment_type
4583 elfcpp::PF_W, // segment_flags_set
4584 elfcpp::PF(0), // segment_flags_clear
4585 0, // value
4586 0, // size
4587 elfcpp::STT_NOTYPE, // type
4588 elfcpp::STB_GLOBAL, // binding
4589 elfcpp::STV_HIDDEN, // visibility
4590 0, // nonvis
4591 Symbol::SEGMENT_START, // offset_from_base
4592 true // only_if_ref
4593 }
4594 };
4595
4596 symtab->define_symbols(layout, 2, syms,
4597 layout->script_options()->saw_sections_clause());
4598 }
2e30d253
ILT		 4599}
4600
19ef3f4d
CC		 4601// For x32, we need to handle PC-relative relocations using full 64-bit
4602// arithmetic, so that we can detect relocation overflows properly.
4603// This class overrides the pcrela32_check methods from the defaults in
4604// Relocate_functions in reloc.h.
4605
4606template<int size>
4607class X86_64_relocate_functions : public Relocate_functions<size, false>
4608{
4609 public:
4610 typedef Relocate_functions<size, false> Base;
4611
4612 // Do a simple PC relative relocation with the addend in the
4613 // relocation.
4614 static inline typename Base::Reloc_status
4615 pcrela32_check(unsigned char* view,
4616 typename elfcpp::Elf_types<64>::Elf_Addr value,
4617 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
4618 typename elfcpp::Elf_types<64>::Elf_Addr address)
4619 {
4620 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
4621 Valtype* wv = reinterpret_cast<Valtype*>(view);
4622 value = value + addend - address;
4623 elfcpp::Swap<32, false>::writeval(wv, value);
4624 return (Bits<32>::has_overflow(value)
4625 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
4626 }
4627
4628 // Do a simple PC relative relocation with a Symbol_value with the
4629 // addend in the relocation.
4630 static inline typename Base::Reloc_status
4631 pcrela32_check(unsigned char* view,
4632 const Sized_relobj_file<size, false>* object,
4633 const Symbol_value<size>* psymval,
4634 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
4635 typename elfcpp::Elf_types<64>::Elf_Addr address)
4636 {
4637 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
4638 Valtype* wv = reinterpret_cast<Valtype*>(view);
7c8b700c
CC		 4639 typename elfcpp::Elf_types<64>::Elf_Addr value;
4640 if (addend >= 0)
4641 value = psymval->value(object, addend);
4642 else
4643 {
4644 // For negative addends, get the symbol value without
4645 // the addend, then add the addend using 64-bit arithmetic.
4646 value = psymval->value(object, 0);
4647 value += addend;
4648 }
4649 value -= address;
19ef3f4d
CC		 4650 elfcpp::Swap<32, false>::writeval(wv, value);
4651 return (Bits<32>::has_overflow(value)
4652 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
4653 }
4654};
4655
2e30d253
ILT		 4656// Perform a relocation.
4657
fc51264f 4658template<int size>
2e30d253 4659inline bool
fc51264f
L		 4660Target_x86_64<size>::Relocate::relocate(
4661 const Relocate_info<size, false>* relinfo,
91a65d2f 4662 unsigned int,
fc51264f
L		 4663 Target_x86_64<size>* target,
4664 Output_section*,
4665 size_t relnum,
91a65d2f 4666 const unsigned char* preloc,
fc51264f
L		 4667 const Sized_symbol<size>* gsym,
4668 const Symbol_value<size>* psymval,
4669 unsigned char* view,
4670 typename elfcpp::Elf_types<size>::Elf_Addr address,
4671 section_size_type view_size)
2e30d253 4672{
19ef3f4d 4673 typedef X86_64_relocate_functions<size> Reloc_funcs;
91a65d2f
AM		 4674 const elfcpp::Rela<size, false> rela(preloc);
4675 unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
4676
2e30d253
ILT		 4677 if (this->skip_call_tls_get_addr_)
4678 {
5efc7cd2 4679 if ((r_type != elfcpp::R_X86_64_PLT32
f5713901 4680 && r_type != elfcpp::R_X86_64_GOTPCREL
ad961eab 4681 && r_type != elfcpp::R_X86_64_GOTPCRELX
f49fe902
L		 4682 && r_type != elfcpp::R_X86_64_PLT32_BND
4683 && r_type != elfcpp::R_X86_64_PC32_BND
2e702c99 4684 && r_type != elfcpp::R_X86_64_PC32)
2e30d253 4685 || gsym == NULL
0ffd9845 4686 || strcmp(gsym->name(), "__tls_get_addr") != 0)
2e30d253 4687 {
75f2446e
ILT		 4688 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4689 _("missing expected TLS relocation"));
f5713901 4690 this->skip_call_tls_get_addr_ = false;
75f2446e
ILT		 4691 }
4692 else
4693 {
4694 this->skip_call_tls_get_addr_ = false;
4695 return false;
2e30d253 4696 }
2e30d253
ILT		 4697 }
4698
0e804863
ILT		 4699 if (view == NULL)
4700 return true;
4701
fc51264f 4702 const Sized_relobj_file<size, false>* object = relinfo->object;
7223e9ca
ILT		 4703
4704 // Pick the value to use for symbols defined in the PLT.
fc51264f 4705 Symbol_value<size> symval;
96f2030e 4706 if (gsym != NULL
95a2c8d6 4707 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
2e30d253 4708 {
19fec8c1 4709 symval.set_output_value(target->plt_address_for_global(gsym));
2e30d253
ILT		 4710 psymval = &symval;
4711 }
7223e9ca
ILT		 4712 else if (gsym == NULL && psymval->is_ifunc_symbol())
4713 {
fc51264f 4714 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7223e9ca
ILT		 4715 if (object->local_has_plt_offset(r_sym))
4716 {
19fec8c1 4717 symval.set_output_value(target->plt_address_for_local(object, r_sym));
7223e9ca
ILT		 4718 psymval = &symval;
4719 }
4720 }
2e30d253 4721
0ffd9845
ILT		 4722 const elfcpp::Elf_Xword addend = rela.get_r_addend();
4723
4724 // Get the GOT offset if needed.
96f2030e
ILT		 4725 // The GOT pointer points to the end of the GOT section.
4726 // We need to subtract the size of the GOT section to get
4727 // the actual offset to use in the relocation.
0ffd9845 4728 bool have_got_offset = false;
c23dd342
L		 4729 // Since the actual offset is always negative, we use signed int to
4730 // support 64-bit GOT relocations.
4731 int got_offset = 0;
0ffd9845
ILT		 4732 switch (r_type)
4733 {
4734 case elfcpp::R_X86_64_GOT32:
4735 case elfcpp::R_X86_64_GOT64:
4736 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845
ILT		 4737 case elfcpp::R_X86_64_GOTPCREL64:
4738 if (gsym != NULL)
2e702c99
RM		 4739 {
4740 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
4741 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
4742 }
0ffd9845 4743 else
2e702c99
RM		 4744 {
4745 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
4746 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
4747 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
4748 - target->got_size());
4749 }
0ffd9845
ILT		 4750 have_got_offset = true;
4751 break;
4752
4753 default:
4754 break;
4755 }
2e30d253 4756
c34c98ed
CC		 4757 typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK;
4758
2e30d253
ILT		 4759 switch (r_type)
4760 {
4761 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 4762 case elfcpp::R_X86_64_GNU_VTINHERIT:
4763 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 4764 break;
4765
4766 case elfcpp::R_X86_64_64:
c34c98ed 4767 Reloc_funcs::rela64(view, object, psymval, addend);
2e30d253
ILT		 4768 break;
4769
4770 case elfcpp::R_X86_64_PC64:
c34c98ed 4771 Reloc_funcs::pcrela64(view, object, psymval, addend,
2e702c99 4772 address);
2e30d253
ILT		 4773 break;
4774
4775 case elfcpp::R_X86_64_32:
c34c98ed
CC		 4776 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
4777 Reloc_funcs::CHECK_UNSIGNED);
2e30d253
ILT		 4778 break;
4779
4780 case elfcpp::R_X86_64_32S:
c34c98ed
CC		 4781 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
4782 Reloc_funcs::CHECK_SIGNED);
2e30d253
ILT		 4783 break;
4784
4785 case elfcpp::R_X86_64_PC32:
f49fe902 4786 case elfcpp::R_X86_64_PC32_BND:
c34c98ed 4787 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 4788 address);
2e30d253
ILT		 4789 break;
4790
4791 case elfcpp::R_X86_64_16:
c34c98ed 4792 Reloc_funcs::rela16(view, object, psymval, addend);
2e30d253
ILT		 4793 break;
4794
4795 case elfcpp::R_X86_64_PC16:
c34c98ed 4796 Reloc_funcs::pcrela16(view, object, psymval, addend, address);
2e30d253
ILT		 4797 break;
4798
4799 case elfcpp::R_X86_64_8:
c34c98ed 4800 Reloc_funcs::rela8(view, object, psymval, addend);
2e30d253
ILT		 4801 break;
4802
4803 case elfcpp::R_X86_64_PC8:
c34c98ed 4804 Reloc_funcs::pcrela8(view, object, psymval, addend, address);
2e30d253
ILT		 4805 break;
4806
4807 case elfcpp::R_X86_64_PLT32:
f49fe902 4808 case elfcpp::R_X86_64_PLT32_BND:
f389a824 4809 gold_assert(gsym == NULL
2e702c99 4810 || gsym->has_plt_offset()
99f8faca
ILT		 4811 || gsym->final_value_is_known()
4812 || (gsym->is_defined()
4813 && !gsym->is_from_dynobj()
4814 && !gsym->is_preemptible()));
ee9e9e86
ILT		 4815 // Note: while this code looks the same as for R_X86_64_PC32, it
4816 // behaves differently because psymval was set to point to
4817 // the PLT entry, rather than the symbol, in Scan::global().
c34c98ed 4818 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 4819 address);
2e30d253
ILT		 4820 break;
4821
ee9e9e86
ILT		 4822 case elfcpp::R_X86_64_PLTOFF64:
4823 {
2e702c99
RM		 4824 gold_assert(gsym);
4825 gold_assert(gsym->has_plt_offset()
4826 || gsym->final_value_is_known());
fc51264f 4827 typename elfcpp::Elf_types<size>::Elf_Addr got_address;
c23dd342
L		 4828 // This is the address of GLOBAL_OFFSET_TABLE.
4829 got_address = target->got_plt_section()->address();
c34c98ed 4830 Reloc_funcs::rela64(view, object, psymval, addend - got_address);
ee9e9e86 4831 }
7849f6d8 4832 break;
ee9e9e86 4833
2e30d253 4834 case elfcpp::R_X86_64_GOT32:
0ffd9845 4835 gold_assert(have_got_offset);
c34c98ed 4836 Reloc_funcs::rela32(view, got_offset, addend);
2e30d253
ILT		 4837 break;
4838
e822f2b1
ILT		 4839 case elfcpp::R_X86_64_GOTPC32:
4840 {
2e702c99 4841 gold_assert(gsym);
fc51264f 4842 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 4843 value = target->got_plt_section()->address();
19ef3f4d 4844 Reloc_funcs::pcrela32_check(view, value, addend, address);
e822f2b1
ILT		 4845 }
4846 break;
4847
4848 case elfcpp::R_X86_64_GOT64:
fdc2f80f 4849 case elfcpp::R_X86_64_GOTPLT64:
de194d85 4850 // R_X86_64_GOTPLT64 is obsolete and treated the same as
e88ba8d5 4851 // GOT64.
0ffd9845 4852 gold_assert(have_got_offset);
c34c98ed 4853 Reloc_funcs::rela64(view, got_offset, addend);
e822f2b1
ILT		 4854 break;
4855
4856 case elfcpp::R_X86_64_GOTPC64:
4857 {
2e702c99 4858 gold_assert(gsym);
fc51264f 4859 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 4860 value = target->got_plt_section()->address();
c34c98ed 4861 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 4862 }
4863 break;
4864
2e30d253
ILT		 4865 case elfcpp::R_X86_64_GOTOFF64:
4866 {
ea8e302e
AM		 4867 typename elfcpp::Elf_types<size>::Elf_Addr reladdr;
4868 reladdr = target->got_plt_section()->address();
4869 Reloc_funcs::pcrela64(view, object, psymval, addend, reladdr);
2e30d253
ILT		 4870 }
4871 break;
4872
4873 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 4874 case elfcpp::R_X86_64_GOTPCRELX:
4875 case elfcpp::R_X86_64_REX_GOTPCRELX:
2e30d253 4876 {
1fa29f10
IT		 4877 // Convert
4878 // mov foo@GOTPCREL(%rip), %reg
4879 // to lea foo(%rip), %reg.
4880 // if possible.
158600eb
CC		 4881 if (!parameters->incremental()
4882 && ((gsym == NULL
4883 && rela.get_r_offset() >= 2
4884 && view[-2] == 0x8b
4885 && !psymval->is_ifunc_symbol())
4886 || (gsym != NULL
4887 && rela.get_r_offset() >= 2
4888 && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
4889 0, &view))))
1fa29f10
IT		 4890 {
4891 view[-2] = 0x8d;
19ef3f4d 4892 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
1fa29f10 4893 }
3a4f096e
ST		 4894 // Convert
4895 // callq *foo@GOTPCRELX(%rip) to
4896 // addr32 callq foo
4897 // and jmpq *foo@GOTPCRELX(%rip) to
4898 // jmpq foo
4899 // nop
158600eb
CC		 4900 else if (!parameters->incremental()
4901 && gsym != NULL
3a4f096e
ST		 4902 && rela.get_r_offset() >= 2
4903 && Target_x86_64<size>::can_convert_callq_to_direct(gsym,
4904 r_type,
4905 0, &view))
4906 {
4907 if (view[-1] == 0x15)
4908 {
4909 // Convert callq *foo@GOTPCRELX(%rip) to addr32 callq.
4910 // Opcode of addr32 is 0x67 and opcode of direct callq is 0xe8.
4911 view[-2] = 0x67;
4912 view[-1] = 0xe8;
4913 // Convert GOTPCRELX to 32-bit pc relative reloc.
4914 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
4915 }
4916 else
4917 {
4918 // Convert jmpq *foo@GOTPCRELX(%rip) to
4919 // jmpq foo
4920 // nop
4921 // The opcode of direct jmpq is 0xe9.
4922 view[-2] = 0xe9;
4923 // The opcode of nop is 0x90.
4924 view[3] = 0x90;
4925 // Convert GOTPCRELX to 32-bit pc relative reloc. jmpq is rip
4926 // relative and since the instruction following the jmpq is now
4927 // the nop, offset the address by 1 byte. The start of the
4928 // relocation also moves ahead by 1 byte.
4929 Reloc_funcs::pcrela32(&view[-1], object, psymval, addend,
4930 address - 1);
4931 }
4932 }
1fa29f10
IT		 4933 else
4934 {
4935 if (gsym != NULL)
4936 {
4937 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
ed35cc4a
CC		 4938 got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
4939 - target->got_size());
1fa29f10
IT		 4940 }
4941 else
4942 {
4943 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
ed35cc4a
CC		 4944 gold_assert(object->local_has_got_offset(r_sym,
4945 GOT_TYPE_STANDARD));
1fa29f10
IT		 4946 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
4947 - target->got_size());
4948 }
4949 typename elfcpp::Elf_types<size>::Elf_Addr value;
4950 value = target->got_plt_section()->address() + got_offset;
19ef3f4d 4951 Reloc_funcs::pcrela32_check(view, value, addend, address);
1fa29f10 4952 }
2e30d253
ILT		 4953 }
4954 break;
4955
e822f2b1
ILT		 4956 case elfcpp::R_X86_64_GOTPCREL64:
4957 {
2e702c99
RM		 4958 gold_assert(have_got_offset);
4959 typename elfcpp::Elf_types<size>::Elf_Addr value;
4960 value = target->got_plt_section()->address() + got_offset;
c34c98ed 4961 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 4962 }
4963 break;
4964
2e30d253
ILT		 4965 case elfcpp::R_X86_64_COPY:
4966 case elfcpp::R_X86_64_GLOB_DAT:
4967 case elfcpp::R_X86_64_JUMP_SLOT:
4968 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 4969 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 4970 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 4971 case elfcpp::R_X86_64_TPOFF64:
2e30d253 4972 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 4973 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 4974 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4975 _("unexpected reloc %u in object file"),
4976 r_type);
2e30d253
ILT		 4977 break;
4978
d61c17ea 4979 // These are initial tls relocs, which are expected when linking
56622147
ILT		 4980 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
4981 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 4982 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 4983 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 4984 case elfcpp::R_X86_64_DTPOFF32:
4985 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 4986 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
4987 case elfcpp::R_X86_64_TPOFF32: // Local-exec
7bf1f802 4988 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
2e702c99 4989 view, address, view_size);
2e30d253 4990 break;
2e30d253 4991
fdc2f80f
ILT		 4992 case elfcpp::R_X86_64_SIZE32:
4993 case elfcpp::R_X86_64_SIZE64:
2e30d253 4994 default:
75f2446e
ILT		 4995 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4996 _("unsupported reloc %u"),
4997 r_type);
2e30d253
ILT		 4998 break;
4999 }
5000
c34c98ed 5001 if (rstatus == Reloc_funcs::RELOC_OVERFLOW)
17ecd016
CC		 5002 {
5003 if (gsym == NULL)
5004 {
5005 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5006 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5007 _("relocation overflow: "
5008 "reference to local symbol %u in %s"),
5009 r_sym, object->name().c_str());
5010 }
5011 else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT)
5012 {
5013 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5014 _("relocation overflow: "
5015 "reference to '%s' defined in %s"),
5016 gsym->name(),
5017 gsym->object()->name().c_str());
5018 }
5019 else
5020 {
5021 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5022 _("relocation overflow: reference to '%s'"),
5023 gsym->name());
5024 }
5025 }
c34c98ed 5026
2e30d253
ILT		 5027 return true;
5028}
5029
5030// Perform a TLS relocation.
5031
fc51264f 5032template<int size>
2e30d253 5033inline void
fc51264f
L		 5034Target_x86_64<size>::Relocate::relocate_tls(
5035 const Relocate_info<size, false>* relinfo,
5036 Target_x86_64<size>* target,
5037 size_t relnum,
5038 const elfcpp::Rela<size, false>& rela,
5039 unsigned int r_type,
5040 const Sized_symbol<size>* gsym,
5041 const Symbol_value<size>* psymval,
5042 unsigned char* view,
5043 typename elfcpp::Elf_types<size>::Elf_Addr address,
5044 section_size_type view_size)
2e30d253 5045{
2e30d253 5046 Output_segment* tls_segment = relinfo->layout->tls_segment();
7bf1f802 5047
fc51264f 5048 const Sized_relobj_file<size, false>* object = relinfo->object;
6a41d30b 5049 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 5050 elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
36171d64 5051 bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
2e30d253 5052
fc51264f 5053 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
2e30d253
ILT		 5054
5055 const bool is_final = (gsym == NULL
b3705d2a 5056 ? !parameters->options().shared()
2e30d253 5057 : gsym->final_value_is_known());
36171d64 5058 tls::Tls_optimization optimized_type
fc51264f 5059 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 5060 switch (r_type)
5061 {
56622147 5062 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
36171d64
CC		 5063 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
5064 {
5065 // If this code sequence is used in a non-executable section,
5066 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
5067 // on the assumption that it's being used by itself in a debug
5068 // section. Therefore, in the unlikely event that the code
5069 // sequence appears in a non-executable section, we simply
5070 // leave it unoptimized.
5071 optimized_type = tls::TLSOPT_NONE;
5072 }
e041f13d 5073 if (optimized_type == tls::TLSOPT_TO_LE)
2e30d253 5074 {
62855347
ILT		 5075 if (tls_segment == NULL)
5076 {
191f1a2d
ILT		 5077 gold_assert(parameters->errors()->error_count() > 0
5078 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5079 return;
5080 }
2e30d253 5081 this->tls_gd_to_le(relinfo, relnum, tls_segment,
72ec2876 5082 rela, r_type, value, view,
2e30d253
ILT		 5083 view_size);
5084 break;
5085 }
7bf1f802 5086 else
2e702c99
RM		 5087 {
5088 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
5089 ? GOT_TYPE_TLS_OFFSET
5090 : GOT_TYPE_TLS_PAIR);
5091 unsigned int got_offset;
5092 if (gsym != NULL)
5093 {
5094 gold_assert(gsym->has_got_offset(got_type));
5095 got_offset = gsym->got_offset(got_type) - target->got_size();
5096 }
5097 else
5098 {
5099 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5100 gold_assert(object->local_has_got_offset(r_sym, got_type));
5101 got_offset = (object->local_got_offset(r_sym, got_type)
5102 - target->got_size());
5103 }
5104 if (optimized_type == tls::TLSOPT_TO_IE)
5105 {
5106 value = target->got_plt_section()->address() + got_offset;
d21f123b 5107 this->tls_gd_to_ie(relinfo, relnum, rela, r_type,
2e702c99
RM		 5108 value, view, address, view_size);
5109 break;
5110 }
5111 else if (optimized_type == tls::TLSOPT_NONE)
5112 {
5113 // Relocate the field with the offset of the pair of GOT
5114 // entries.
6a41d30b 5115 value = target->got_plt_section()->address() + got_offset;
2e702c99 5116 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5117 address);
2e702c99
RM		 5118 break;
5119 }
5120 }
72ec2876 5121 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 5122 _("unsupported reloc %u"), r_type);
2e30d253
ILT		 5123 break;
5124
c2b45e22
CC		 5125 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
5126 case elfcpp::R_X86_64_TLSDESC_CALL:
36171d64
CC		 5127 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
5128 {
5129 // See above comment for R_X86_64_TLSGD.
5130 optimized_type = tls::TLSOPT_NONE;
5131 }
c2b45e22
CC		 5132 if (optimized_type == tls::TLSOPT_TO_LE)
5133 {
62855347
ILT		 5134 if (tls_segment == NULL)
5135 {
191f1a2d
ILT		 5136 gold_assert(parameters->errors()->error_count() > 0
5137 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5138 return;
5139 }
c2b45e22 5140 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2e702c99
RM		 5141 rela, r_type, value, view,
5142 view_size);
c2b45e22
CC		 5143 break;
5144 }
5145 else
2e702c99
RM		 5146 {
5147 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
5148 ? GOT_TYPE_TLS_OFFSET
5149 : GOT_TYPE_TLS_DESC);
5150 unsigned int got_offset = 0;
a8df5856
ILT		 5151 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
5152 && optimized_type == tls::TLSOPT_NONE)
5153 {
5154 // We created GOT entries in the .got.tlsdesc portion of
5155 // the .got.plt section, but the offset stored in the
5156 // symbol is the offset within .got.tlsdesc.
5157 got_offset = (target->got_size()
5158 + target->got_plt_section()->data_size());
5159 }
2e702c99
RM		 5160 if (gsym != NULL)
5161 {
5162 gold_assert(gsym->has_got_offset(got_type));
5163 got_offset += gsym->got_offset(got_type) - target->got_size();
5164 }
5165 else
5166 {
5167 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5168 gold_assert(object->local_has_got_offset(r_sym, got_type));
5169 got_offset += (object->local_got_offset(r_sym, got_type)
a8df5856 5170 - target->got_size());
2e702c99
RM		 5171 }
5172 if (optimized_type == tls::TLSOPT_TO_IE)
5173 {
2e702c99 5174 value = target->got_plt_section()->address() + got_offset;
d21f123b 5175 this->tls_desc_gd_to_ie(relinfo, relnum,
2e702c99
RM		 5176 rela, r_type, value, view, address,
5177 view_size);
5178 break;
5179 }
5180 else if (optimized_type == tls::TLSOPT_NONE)
5181 {
5182 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
5183 {
5184 // Relocate the field with the offset of the pair of GOT
5185 // entries.
5186 value = target->got_plt_section()->address() + got_offset;
5187 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5188 address);
2e702c99
RM		 5189 }
5190 break;
5191 }
5192 }
c2b45e22
CC		 5193 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5194 _("unsupported reloc %u"), r_type);
5195 break;
5196
56622147 5197 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
36171d64
CC		 5198 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
5199 {
5200 // See above comment for R_X86_64_TLSGD.
5201 optimized_type = tls::TLSOPT_NONE;
5202 }
e041f13d 5203 if (optimized_type == tls::TLSOPT_TO_LE)
2e702c99 5204 {
62855347
ILT		 5205 if (tls_segment == NULL)
5206 {
191f1a2d
ILT		 5207 gold_assert(parameters->errors()->error_count() > 0
5208 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5209 return;
5210 }
72ec2876
ILT		 5211 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
5212 value, view, view_size);
5213 break;
2e702c99 5214 }
7bf1f802 5215 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 5216 {
5217 // Relocate the field with the offset of the GOT entry for
5218 // the module index.
5219 unsigned int got_offset;
5220 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
31d60480 5221 - target->got_size());
6a41d30b 5222 value = target->got_plt_section()->address() + got_offset;
2e702c99 5223 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5224 address);
2e702c99
RM		 5225 break;
5226 }
72ec2876 5227 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 5228 _("unsupported reloc %u"), r_type);
2e30d253 5229 break;
0ffd9845
ILT		 5230
5231 case elfcpp::R_X86_64_DTPOFF32:
36171d64
CC		 5232 // This relocation type is used in debugging information.
5233 // In that case we need to not optimize the value. If the
5234 // section is not executable, then we assume we should not
5235 // optimize this reloc. See comments above for R_X86_64_TLSGD,
5236 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
5237 // R_X86_64_TLSLD.
5238 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
5239 {
62855347
ILT		 5240 if (tls_segment == NULL)
5241 {
191f1a2d
ILT		 5242 gold_assert(parameters->errors()->error_count() > 0
5243 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5244 return;
5245 }
36171d64
CC		 5246 value -= tls_segment->memsz();
5247 }
fc51264f 5248 Relocate_functions<size, false>::rela32(view, value, addend);
0ffd9845
ILT		 5249 break;
5250
5251 case elfcpp::R_X86_64_DTPOFF64:
36171d64
CC		 5252 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
5253 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
5254 {
62855347
ILT		 5255 if (tls_segment == NULL)
5256 {
191f1a2d
ILT		 5257 gold_assert(parameters->errors()->error_count() > 0
5258 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5259 return;
5260 }
36171d64
CC		 5261 value -= tls_segment->memsz();
5262 }
fc51264f 5263 Relocate_functions<size, false>::rela64(view, value, addend);
0ffd9845 5264 break;
2e30d253 5265
56622147 5266 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
24dd5808
CC		 5267 if (gsym != NULL
5268 && gsym->is_undefined()
5269 && parameters->options().output_is_executable())
65d92137
CC		 5270 {
5271 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
5272 NULL, rela,
5273 r_type, value, view,
5274 view_size);
5275 break;
5276 }
5277 else if (optimized_type == tls::TLSOPT_TO_LE)
56622147 5278 {
62855347
ILT		 5279 if (tls_segment == NULL)
5280 {
191f1a2d
ILT		 5281 gold_assert(parameters->errors()->error_count() > 0
5282 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5283 return;
5284 }
fc51264f
L		 5285 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
5286 tls_segment, rela,
5287 r_type, value, view,
5288 view_size);
56622147
ILT		 5289 break;
5290 }
7bf1f802 5291 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 5292 {
5293 // Relocate the field with the offset of the GOT entry for
5294 // the tp-relative offset of the symbol.
5295 unsigned int got_offset;
5296 if (gsym != NULL)
5297 {
5298 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
5299 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
5300 - target->got_size());
5301 }
5302 else
5303 {
5304 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5305 gold_assert(object->local_has_got_offset(r_sym,
5306 GOT_TYPE_TLS_OFFSET));
5307 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
5308 - target->got_size());
5309 }
6a41d30b 5310 value = target->got_plt_section()->address() + got_offset;
2e702c99 5311 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5312 address);
2e702c99
RM		 5313 break;
5314 }
56622147
ILT		 5315 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5316 _("unsupported reloc type %u"),
5317 r_type);
5318 break;
0ffd9845 5319
56622147 5320 case elfcpp::R_X86_64_TPOFF32: // Local-exec
62855347
ILT		 5321 if (tls_segment == NULL)
5322 {
191f1a2d
ILT		 5323 gold_assert(parameters->errors()->error_count() > 0
5324 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5325 return;
5326 }
6a41d30b 5327 value -= tls_segment->memsz();
fc51264f 5328 Relocate_functions<size, false>::rela32(view, value, addend);
56622147 5329 break;
2e30d253 5330 }
2e30d253
ILT		 5331}
5332
7bf1f802
ILT		 5333// Do a relocation in which we convert a TLS General-Dynamic to an
5334// Initial-Exec.
5335
fc51264f 5336template<int size>
7bf1f802 5337inline void
fc51264f
L		 5338Target_x86_64<size>::Relocate::tls_gd_to_ie(
5339 const Relocate_info<size, false>* relinfo,
5340 size_t relnum,
fc51264f
L		 5341 const elfcpp::Rela<size, false>& rela,
5342 unsigned int,
5343 typename elfcpp::Elf_types<size>::Elf_Addr value,
5344 unsigned char* view,
5345 typename elfcpp::Elf_types<size>::Elf_Addr address,
5346 section_size_type view_size)
7bf1f802 5347{
41194d9f
L		 5348 // For SIZE == 64:
5349 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5350 // .word 0x6666; rex64; call __tls_get_addr@PLT
5351 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
5352 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
5353 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f
L		 5354 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
5355 // For SIZE == 32:
5356 // leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5357 // .word 0x6666; rex64; call __tls_get_addr@PLT
5358 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
5359 // leaq foo@tlsgd(%rip),%rdi;
5360 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f 5361 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
7bf1f802 5362
7bf1f802 5363 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
7bf1f802 5364 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ad961eab
L		 5365 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
5366 || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
7bf1f802 5367
41194d9f
L		 5368 if (size == 64)
5369 {
5370 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5371 -4);
5372 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5373 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
5374 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
5375 16);
5376 }
5377 else
5378 {
5379 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5380 -3);
5381 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5382 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
5383 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
5384 15);
5385 }
7bf1f802 5386
c2b45e22 5387 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f
L		 5388 Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
5389 address);
7bf1f802
ILT		 5390
5391 // The next reloc should be a PLT32 reloc against __tls_get_addr.
5392 // We can skip it.
5393 this->skip_call_tls_get_addr_ = true;
5394}
5395
e041f13d 5396// Do a relocation in which we convert a TLS General-Dynamic to a
2e30d253
ILT		 5397// Local-Exec.
5398
fc51264f 5399template<int size>
2e30d253 5400inline void
fc51264f
L		 5401Target_x86_64<size>::Relocate::tls_gd_to_le(
5402 const Relocate_info<size, false>* relinfo,
5403 size_t relnum,
5404 Output_segment* tls_segment,
5405 const elfcpp::Rela<size, false>& rela,
5406 unsigned int,
5407 typename elfcpp::Elf_types<size>::Elf_Addr value,
5408 unsigned char* view,
5409 section_size_type view_size)
2e30d253 5410{
41194d9f
L		 5411 // For SIZE == 64:
5412 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5413 // .word 0x6666; rex64; call __tls_get_addr@PLT
5414 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
5415 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
5416 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f
L		 5417 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
5418 // For SIZE == 32:
5419 // leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5420 // .word 0x6666; rex64; call __tls_get_addr@PLT
5421 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
5422 // leaq foo@tlsgd(%rip),%rdi;
5423 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f 5424 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
2e30d253 5425
72ec2876 5426 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
72ec2876 5427 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ad961eab
L		 5428 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
5429 || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
41194d9f
L		 5430
5431 if (size == 64)
5432 {
5433 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5434 -4);
5435 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5436 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
5437 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
5438 16);
5439 }
5440 else
5441 {
5442 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5443 -3);
5444 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5445 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
2e30d253 5446
41194d9f
L		 5447 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
5448 15);
5449 }
2e30d253 5450
6a41d30b 5451 value -= tls_segment->memsz();
fc51264f 5452 Relocate_functions<size, false>::rela32(view + 8, value, 0);
2e30d253
ILT		 5453
5454 // The next reloc should be a PLT32 reloc against __tls_get_addr.
5455 // We can skip it.
5456 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 5457}
5458
c2b45e22
CC		 5459// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
5460
fc51264f 5461template<int size>
c2b45e22 5462inline void
fc51264f
L		 5463Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
5464 const Relocate_info<size, false>* relinfo,
c2b45e22 5465 size_t relnum,
fc51264f 5466 const elfcpp::Rela<size, false>& rela,
c2b45e22 5467 unsigned int r_type,
fc51264f 5468 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 5469 unsigned char* view,
fc51264f 5470 typename elfcpp::Elf_types<size>::Elf_Addr address,
c2b45e22
CC		 5471 section_size_type view_size)
5472{
5473 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
5474 {
ccf20d46
L		 5475 // LP64: leaq foo@tlsdesc(%rip), %rax
5476 // ==> movq foo@gottpoff(%rip), %rax
5477 // X32: rex leal foo@tlsdesc(%rip), %eax
5478 // ==> rex movl foo@gottpoff(%rip), %eax
c2b45e22
CC		 5479 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5480 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
5481 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ccf20d46
L		 5482 (((view[-3] & 0xfb) == 0x48
5483 || (size == 32 && (view[-3] & 0xfb) == 0x40))
6d520e36
L		 5484 && view[-2] == 0x8d
5485 && (view[-1] & 0xc7) == 0x05));
c2b45e22
CC		 5486 view[-2] = 0x8b;
5487 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 5488 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
c2b45e22
CC		 5489 }
5490 else
5491 {
ccf20d46
L		 5492 // LP64: call *foo@tlscall(%rax)
5493 // ==> xchg %ax, %ax
5494 // X32: call *foo@tlscall(%eax)
5495 // ==> nopl (%rax)
c2b45e22
CC		 5496 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
5497 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
ccf20d46
L		 5498 int prefix = 0;
5499 if (size == 32 && view[0] == 0x67)
5500 {
5501 tls::check_range(relinfo, relnum, rela.get_r_offset(),
5502 view_size, 3);
5503 prefix = 1;
5504 }
c2b45e22 5505 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ccf20d46
L		 5506 view[prefix] == 0xff && view[prefix + 1] == 0x10);
5507 if (prefix)
5508 {
5509 view[0] = 0x0f;
5510 view[1] = 0x1f;
5511 view[2] = 0x00;
5512 }
5513 else
5514 {
5515 view[0] = 0x66;
5516 view[1] = 0x90;
5517 }
c2b45e22
CC		 5518 }
5519}
5520
5521// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
5522
fc51264f 5523template<int size>
c2b45e22 5524inline void
fc51264f
L		 5525Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
5526 const Relocate_info<size, false>* relinfo,
c2b45e22
CC		 5527 size_t relnum,
5528 Output_segment* tls_segment,
fc51264f 5529 const elfcpp::Rela<size, false>& rela,
c2b45e22 5530 unsigned int r_type,
fc51264f 5531 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 5532 unsigned char* view,
5533 section_size_type view_size)
5534{
5535 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
5536 {
ccf20d46
L		 5537 // LP64: leaq foo@tlsdesc(%rip), %rax
5538 // ==> movq foo@tpoff, %rax
5539 // X32: rex leal foo@tlsdesc(%rip), %eax
5540 // ==> rex movl foo@tpoff, %eax
c2b45e22
CC		 5541 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5542 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
5543 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ccf20d46
L		 5544 (((view[-3] & 0xfb) == 0x48
5545 || (size == 32 && (view[-3] & 0xfb) == 0x40))
6d520e36
L		 5546 && view[-2] == 0x8d
5547 && (view[-1] & 0xc7) == 0x05));
ccf20d46 5548 view[-3] = (view[-3] & 0x48) | ((view[-3] >> 2) & 1);
c2b45e22 5549 view[-2] = 0xc7;
6d520e36 5550 view[-1] = 0xc0 | ((view[-1] >> 3) & 7);
c2b45e22 5551 value -= tls_segment->memsz();
fc51264f 5552 Relocate_functions<size, false>::rela32(view, value, 0);
c2b45e22
CC		 5553 }
5554 else
5555 {
ccf20d46
L		 5556 // LP64: call *foo@tlscall(%rax)
5557 // ==> xchg %ax, %ax
5558 // X32: call *foo@tlscall(%eax)
5559 // ==> nopl (%rax)
c2b45e22
CC		 5560 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
5561 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
ccf20d46
L		 5562 int prefix = 0;
5563 if (size == 32 && view[0] == 0x67)
5564 {
5565 tls::check_range(relinfo, relnum, rela.get_r_offset(),
5566 view_size, 3);
5567 prefix = 1;
5568 }
c2b45e22 5569 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ccf20d46
L		 5570 view[prefix] == 0xff && view[prefix + 1] == 0x10);
5571 if (prefix)
5572 {
5573 view[0] = 0x0f;
5574 view[1] = 0x1f;
5575 view[2] = 0x00;
5576 }
5577 else
5578 {
5579 view[0] = 0x66;
5580 view[1] = 0x90;
5581 }
c2b45e22
CC		 5582 }
5583}
5584
fc51264f 5585template<int size>
2e30d253 5586inline void
fc51264f
L		 5587Target_x86_64<size>::Relocate::tls_ld_to_le(
5588 const Relocate_info<size, false>* relinfo,
5589 size_t relnum,
5590 Output_segment*,
5591 const elfcpp::Rela<size, false>& rela,
5592 unsigned int,
5593 typename elfcpp::Elf_types<size>::Elf_Addr,
5594 unsigned char* view,
5595 section_size_type view_size)
2e30d253 5596{
72ec2876 5597 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
d2cf1c6c 5598 // For SIZE == 64:
72ec2876
ILT		 5599 // ... leq foo@dtpoff(%rax),%reg
5600 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
d2cf1c6c
L		 5601 // For SIZE == 32:
5602 // ... leq foo@dtpoff(%rax),%reg
5603 // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
ad961eab
L		 5604 // leaq foo@tlsld(%rip),%rdi; call *__tls_get_addr@GOTPCREL(%rip)
5605 // For SIZE == 64:
5606 // ... leq foo@dtpoff(%rax),%reg
5607 // ==> .word 0x6666; .byte 0x6666; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
5608 // For SIZE == 32:
5609 // ... leq foo@dtpoff(%rax),%reg
5610 // ==> nopw 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
2e30d253 5611
72ec2876
ILT		 5612 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5613 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
2e30d253 5614
72ec2876 5615 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 5616 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
72ec2876 5617
ad961eab
L		 5618 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5619 view[4] == 0xe8 || view[4] == 0xff);
72ec2876 5620
ad961eab
L		 5621 if (view[4] == 0xe8)
5622 {
5623 if (size == 64)
5624 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
5625 else
5626 memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
5627 }
d2cf1c6c 5628 else
ad961eab
L		 5629 {
5630 if (size == 64)
5631 memcpy(view - 3, "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0",
5632 13);
5633 else
5634 memcpy(view - 3, "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0",
5635 13);
5636 }
72ec2876
ILT		 5637
5638 // The next reloc should be a PLT32 reloc against __tls_get_addr.
5639 // We can skip it.
5640 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 5641}
5642
56622147
ILT		 5643// Do a relocation in which we convert a TLS Initial-Exec to a
5644// Local-Exec.
5645
fc51264f 5646template<int size>
56622147 5647inline void
fc51264f
L		 5648Target_x86_64<size>::Relocate::tls_ie_to_le(
5649 const Relocate_info<size, false>* relinfo,
5650 size_t relnum,
5651 Output_segment* tls_segment,
5652 const elfcpp::Rela<size, false>& rela,
5653 unsigned int,
5654 typename elfcpp::Elf_types<size>::Elf_Addr value,
5655 unsigned char* view,
5656 section_size_type view_size)
56622147
ILT		 5657{
5658 // We need to examine the opcodes to figure out which instruction we
5659 // are looking at.
5660
5661 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
5662 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
5663
5664 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5665 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
5666
5667 unsigned char op1 = view[-3];
5668 unsigned char op2 = view[-2];
5669 unsigned char op3 = view[-1];
5670 unsigned char reg = op3 >> 3;
5671
5672 if (op2 == 0x8b)
5673 {
5674 // movq
5675 if (op1 == 0x4c)
2e702c99 5676 view[-3] = 0x49;
e749cab8
L		 5677 else if (size == 32 && op1 == 0x44)
5678 view[-3] = 0x41;
56622147
ILT		 5679 view[-2] = 0xc7;
5680 view[-1] = 0xc0 | reg;
5681 }
5682 else if (reg == 4)
5683 {
5684 // Special handling for %rsp.
5685 if (op1 == 0x4c)
2e702c99 5686 view[-3] = 0x49;
e749cab8
L		 5687 else if (size == 32 && op1 == 0x44)
5688 view[-3] = 0x41;
56622147
ILT		 5689 view[-2] = 0x81;
5690 view[-1] = 0xc0 | reg;
5691 }
5692 else
5693 {
5694 // addq
5695 if (op1 == 0x4c)
2e702c99 5696 view[-3] = 0x4d;
e749cab8
L		 5697 else if (size == 32 && op1 == 0x44)
5698 view[-3] = 0x45;
56622147
ILT		 5699 view[-2] = 0x8d;
5700 view[-1] = 0x80 | reg | (reg << 3);
5701 }
5702
65d92137
CC		 5703 if (tls_segment != NULL)
5704 value -= tls_segment->memsz();
fc51264f 5705 Relocate_functions<size, false>::rela32(view, value, 0);
56622147
ILT		 5706}
5707
2e30d253
ILT		 5708// Relocate section data.
5709
fc51264f 5710template<int size>
2e30d253 5711void
fc51264f
L		 5712Target_x86_64<size>::relocate_section(
5713 const Relocate_info<size, false>* relinfo,
364c7fa5
ILT		 5714 unsigned int sh_type,
5715 const unsigned char* prelocs,
5716 size_t reloc_count,
5717 Output_section* output_section,
5718 bool needs_special_offset_handling,
5719 unsigned char* view,
fc51264f 5720 typename elfcpp::Elf_types<size>::Elf_Addr address,
364c7fa5
ILT		 5721 section_size_type view_size,
5722 const Reloc_symbol_changes* reloc_symbol_changes)
2e30d253 5723{
4d625b70
CC		 5724 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5725 Classify_reloc;
5726
2e30d253
ILT		 5727 gold_assert(sh_type == elfcpp::SHT_RELA);
5728
4d625b70
CC		 5729 gold::relocate_section<size, false, Target_x86_64<size>, Relocate,
5730 gold::Default_comdat_behavior, Classify_reloc>(
2e30d253
ILT		 5731 relinfo,
5732 this,
5733 prelocs,
5734 reloc_count,
730cdc88
ILT		 5735 output_section,
5736 needs_special_offset_handling,
2e30d253
ILT		 5737 view,
5738 address,
364c7fa5
ILT		 5739 view_size,
5740 reloc_symbol_changes);
2e30d253
ILT		 5741}
5742
94a3fc8b
CC		 5743// Apply an incremental relocation. Incremental relocations always refer
5744// to global symbols.
5745
fc51264f 5746template<int size>
94a3fc8b 5747void
fc51264f
L		 5748Target_x86_64<size>::apply_relocation(
5749 const Relocate_info<size, false>* relinfo,
5750 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 5751 unsigned int r_type,
fc51264f 5752 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 5753 const Symbol* gsym,
5754 unsigned char* view,
fc51264f 5755 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 5756 section_size_type view_size)
5757{
fc51264f 5758 gold::apply_relocation<size, false, Target_x86_64<size>,
618d6666 5759 typename Target_x86_64<size>::Relocate>(
94a3fc8b
CC		 5760 relinfo,
5761 this,
5762 r_offset,
5763 r_type,
5764 r_addend,
5765 gsym,
5766 view,
5767 address,
5768 view_size);
5769}
5770
4d625b70 5771// Scan the relocs during a relocatable link.
6a74a719 5772
fc51264f 5773template<int size>
4d625b70
CC		 5774void
5775Target_x86_64<size>::scan_relocatable_relocs(
5776 Symbol_table* symtab,
5777 Layout* layout,
5778 Sized_relobj_file<size, false>* object,
5779 unsigned int data_shndx,
5780 unsigned int sh_type,
5781 const unsigned char* prelocs,
5782 size_t reloc_count,
5783 Output_section* output_section,
5784 bool needs_special_offset_handling,
5785 size_t local_symbol_count,
5786 const unsigned char* plocal_symbols,
5787 Relocatable_relocs* rr)
6a74a719 5788{
4d625b70
CC		 5789 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5790 Classify_reloc;
5791 typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
5792 Scan_relocatable_relocs;
6a74a719 5793
4d625b70 5794 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 5795
4d625b70
CC		 5796 gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>(
5797 symtab,
5798 layout,
5799 object,
5800 data_shndx,
5801 prelocs,
5802 reloc_count,
5803 output_section,
5804 needs_special_offset_handling,
5805 local_symbol_count,
5806 plocal_symbols,
5807 rr);
6a74a719
ILT		 5808}
5809
4d625b70 5810// Scan the relocs for --emit-relocs.
6a74a719 5811
fc51264f 5812template<int size>
6a74a719 5813void
4d625b70 5814Target_x86_64<size>::emit_relocs_scan(
fc51264f
L		 5815 Symbol_table* symtab,
5816 Layout* layout,
5817 Sized_relobj_file<size, false>* object,
5818 unsigned int data_shndx,
5819 unsigned int sh_type,
5820 const unsigned char* prelocs,
5821 size_t reloc_count,
5822 Output_section* output_section,
5823 bool needs_special_offset_handling,
5824 size_t local_symbol_count,
4d625b70 5825 const unsigned char* plocal_syms,
fc51264f 5826 Relocatable_relocs* rr)
6a74a719 5827{
4d625b70
CC		 5828 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5829 Classify_reloc;
5830 typedef gold::Default_emit_relocs_strategy<Classify_reloc>
5831 Emit_relocs_strategy;
6a74a719 5832
4d625b70 5833 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 5834
4d625b70 5835 gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>(
6a74a719
ILT		 5836 symtab,
5837 layout,
5838 object,
5839 data_shndx,
5840 prelocs,
5841 reloc_count,
5842 output_section,
5843 needs_special_offset_handling,
5844 local_symbol_count,
4d625b70 5845 plocal_syms,
6a74a719
ILT		 5846 rr);
5847}
5848
5849// Relocate a section during a relocatable link.
5850
fc51264f 5851template<int size>
6a74a719 5852void
7404fe1b 5853Target_x86_64<size>::relocate_relocs(
fc51264f 5854 const Relocate_info<size, false>* relinfo,
6a74a719
ILT		 5855 unsigned int sh_type,
5856 const unsigned char* prelocs,
5857 size_t reloc_count,
5858 Output_section* output_section,
62fe925a 5859 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
6a74a719 5860 unsigned char* view,
fc51264f 5861 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
6a74a719
ILT		 5862 section_size_type view_size,
5863 unsigned char* reloc_view,
5864 section_size_type reloc_view_size)
5865{
4d625b70
CC		 5866 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5867 Classify_reloc;
5868
6a74a719
ILT		 5869 gold_assert(sh_type == elfcpp::SHT_RELA);
5870
4d625b70 5871 gold::relocate_relocs<size, false, Classify_reloc>(
6a74a719
ILT		 5872 relinfo,
5873 prelocs,
5874 reloc_count,
5875 output_section,
5876 offset_in_output_section,
6a74a719
ILT		 5877 view,
5878 view_address,
5879 view_size,
5880 reloc_view,
5881 reloc_view_size);
5882}
5883
4fb6c25d
ILT		 5884// Return the value to use for a dynamic which requires special
5885// treatment. This is how we support equality comparisons of function
5886// pointers across shared library boundaries, as described in the
5887// processor specific ABI supplement.
5888
fc51264f 5889template<int size>
4fb6c25d 5890uint64_t
fc51264f 5891Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4fb6c25d
ILT		 5892{
5893 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
19fec8c1 5894 return this->plt_address_for_global(gsym);
4fb6c25d
ILT		 5895}
5896
2e30d253
ILT		 5897// Return a string used to fill a code section with nops to take up
5898// the specified length.
5899
fc51264f 5900template<int size>
2e30d253 5901std::string
fc51264f 5902Target_x86_64<size>::do_code_fill(section_size_type length) const
2e30d253
ILT		 5903{
5904 if (length >= 16)
5905 {
5906 // Build a jmpq instruction to skip over the bytes.
5907 unsigned char jmp[5];
5908 jmp[0] = 0xe9;
04bf7072 5909 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2e30d253 5910 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2e702c99 5911 + std::string(length - 5, static_cast<char>(0x90)));
2e30d253
ILT		 5912 }
5913
5914 // Nop sequences of various lengths.
76677ad0
CC		 5915 const char nop1[1] = { '\x90' }; // nop
5916 const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
5917 const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
5918 const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
2e702c99 5919 '\x00'};
76677ad0
CC		 5920 const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
5921 '\x00', '\x00' };
5922 const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
2e702c99 5923 '\x44', '\x00', '\x00' };
76677ad0 5924 const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
2e702c99 5925 '\x00', '\x00', '\x00',
76677ad0
CC		 5926 '\x00' };
5927 const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
2e702c99 5928 '\x00', '\x00', '\x00',
76677ad0
CC		 5929 '\x00', '\x00' };
5930 const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
2e702c99 5931 '\x84', '\x00', '\x00',
76677ad0
CC		 5932 '\x00', '\x00', '\x00' };
5933 const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
2e702c99 5934 '\x1f', '\x84', '\x00',
76677ad0
CC		 5935 '\x00', '\x00', '\x00',
5936 '\x00' };
5937 const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
2e702c99 5938 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 5939 '\x00', '\x00', '\x00',
5940 '\x00', '\x00' };
5941 const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
2e702c99 5942 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 5943 '\x84', '\x00', '\x00',
5944 '\x00', '\x00', '\x00' };
5945 const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 5946 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 5947 '\x1f', '\x84', '\x00',
5948 '\x00', '\x00', '\x00',
2e702c99 5949 '\x00' };
76677ad0 5950 const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 5951 '\x66', '\x66', '\x2e', // data16
76677ad0
CC		 5952 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
5953 '\x00', '\x00', '\x00',
2e702c99 5954 '\x00', '\x00' };
76677ad0 5955 const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 5956 '\x66', '\x66', '\x66', // data16; data16
76677ad0
CC		 5957 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
5958 '\x84', '\x00', '\x00',
2e702c99 5959 '\x00', '\x00', '\x00' };
2e30d253
ILT		 5960
5961 const char* nops[16] = {
5962 NULL,
5963 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
5964 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
5965 };
5966
5967 return std::string(nops[length], length);
5968}
5969
e291e7b9
ILT		 5970// Return the addend to use for a target specific relocation. The
5971// only target specific relocation is R_X86_64_TLSDESC for a local
5972// symbol. We want to set the addend is the offset of the local
5973// symbol in the TLS segment.
5974
fc51264f 5975template<int size>
e291e7b9 5976uint64_t
fc51264f
L		 5977Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
5978 uint64_t) const
e291e7b9
ILT		 5979{
5980 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
5981 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
5982 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
5983 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
fc51264f 5984 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
e291e7b9
ILT		 5985 gold_assert(psymval->is_tls_symbol());
5986 // The value of a TLS symbol is the offset in the TLS segment.
5987 return psymval->value(ti.object, 0);
5988}
5989
02d7cd44
ILT		 5990// Return the value to use for the base of a DW_EH_PE_datarel offset
5991// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
5992// assembler can not write out the difference between two labels in
5993// different sections, so instead of using a pc-relative value they
5994// use an offset from the GOT.
5995
fc51264f 5996template<int size>
02d7cd44 5997uint64_t
fc51264f 5998Target_x86_64<size>::do_ehframe_datarel_base() const
02d7cd44
ILT		 5999{
6000 gold_assert(this->global_offset_table_ != NULL);
6001 Symbol* sym = this->global_offset_table_;
fc51264f 6002 Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
02d7cd44
ILT		 6003 return ssym->value();
6004}
6005
364c7fa5 6006// FNOFFSET in section SHNDX in OBJECT is the start of a function
9b547ce6 6007// compiled with -fsplit-stack. The function calls non-split-stack
364c7fa5
ILT		 6008// code. We have to change the function so that it always ensures
6009// that it has enough stack space to run some random function.
6010
4fc1b9d4
L		 6011static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 };
6012static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 };
6013static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 };
6014
6015static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 };
6016static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 };
6017static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 };
6018
fc51264f 6019template<int size>
364c7fa5 6020void
fc51264f
L		 6021Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
6022 section_offset_type fnoffset,
6023 section_size_type fnsize,
6e0813d3
CC		 6024 const unsigned char*,
6025 size_t,
fc51264f
L		 6026 unsigned char* view,
6027 section_size_type view_size,
6028 std::string* from,
6029 std::string* to) const
364c7fa5 6030{
4fc1b9d4
L		 6031 const char* const cmp_insn = reinterpret_cast<const char*>
6032 (size == 32 ? cmp_insn_32 : cmp_insn_64);
6033 const char* const lea_r10_insn = reinterpret_cast<const char*>
6034 (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64);
6035 const char* const lea_r11_insn = reinterpret_cast<const char*>
6036 (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64);
6037
6038 const size_t cmp_insn_len =
6039 (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64));
6040 const size_t lea_r10_insn_len =
6041 (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64));
6042 const size_t lea_r11_insn_len =
6043 (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64));
6044 const size_t nop_len = (size == 32 ? 7 : 8);
6045
364c7fa5
ILT		 6046 // The function starts with a comparison of the stack pointer and a
6047 // field in the TCB. This is followed by a jump.
6048
6049 // cmp %fs:NN,%rsp
4fc1b9d4
L		 6050 if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len)
6051 && fnsize > nop_len + 1)
364c7fa5
ILT		 6052 {
6053 // We will call __morestack if the carry flag is set after this
6054 // comparison. We turn the comparison into an stc instruction
6055 // and some nops.
6056 view[fnoffset] = '\xf9';
4fc1b9d4 6057 this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len);
364c7fa5
ILT		 6058 }
6059 // lea NN(%rsp),%r10
cbc999b9
ILT		 6060 // lea NN(%rsp),%r11
6061 else if ((this->match_view(view, view_size, fnoffset,
4fc1b9d4 6062 lea_r10_insn, lea_r10_insn_len)
cbc999b9 6063 || this->match_view(view, view_size, fnoffset,
4fc1b9d4 6064 lea_r11_insn, lea_r11_insn_len))
364c7fa5
ILT		 6065 && fnsize > 8)
6066 {
6067 // This is loading an offset from the stack pointer for a
6068 // comparison. The offset is negative, so we decrease the
6069 // offset by the amount of space we need for the stack. This
6070 // means we will avoid calling __morestack if there happens to
6071 // be plenty of space on the stack already.
6072 unsigned char* pval = view + fnoffset + 4;
6073 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
6074 val -= parameters->options().split_stack_adjust_size();
6075 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
6076 }
6077 else
6078 {
6079 if (!object->has_no_split_stack())
6080 object->error(_("failed to match split-stack sequence at "
6081 "section %u offset %0zx"),
ac33a407 6082 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 6083 return;
6084 }
6085
6086 // We have to change the function so that it calls
6087 // __morestack_non_split instead of __morestack. The former will
6088 // allocate additional stack space.
6089 *from = "__morestack";
6090 *to = "__morestack_non_split";
6091}
6092
2e702c99
RM		 6093// The selector for x86_64 object files. Note this is never instantiated
6094// directly. It's only used in Target_selector_x86_64_nacl, below.
2e30d253 6095
fc51264f 6096template<int size>
36959681 6097class Target_selector_x86_64 : public Target_selector_freebsd
2e30d253
ILT		 6098{
6099public:
6100 Target_selector_x86_64()
fc51264f 6101 : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
2e702c99 6102 (size == 64
fc51264f 6103 ? "elf64-x86-64" : "elf32-x86-64"),
2e702c99 6104 (size == 64
fc51264f
L		 6105 ? "elf64-x86-64-freebsd"
6106 : "elf32-x86-64-freebsd"),
6107 (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
2e30d253
ILT		 6108 { }
6109
6110 Target*
e96caa79 6111 do_instantiate_target()
fc51264f 6112 { return new Target_x86_64<size>(); }
36959681 6113
2e30d253
ILT		 6114};
6115
2e702c99
RM		 6116// NaCl variant. It uses different PLT contents.
6117
6118template<int size>
6119class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
6120{
6121 public:
6122 Output_data_plt_x86_64_nacl(Layout* layout,
6123 Output_data_got<64, false>* got,
57b2284c 6124 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6125 Output_data_space* got_irelative)
6126 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
6127 got, got_plt, got_irelative)
6128 { }
6129
6130 Output_data_plt_x86_64_nacl(Layout* layout,
6131 Output_data_got<64, false>* got,
57b2284c 6132 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6133 Output_data_space* got_irelative,
6134 unsigned int plt_count)
6135 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
6136 got, got_plt, got_irelative,
6137 plt_count)
6138 { }
6139
6140 protected:
6141 virtual unsigned int
6142 do_get_plt_entry_size() const
6143 { return plt_entry_size; }
6144
6145 virtual void
6146 do_add_eh_frame(Layout* layout)
6147 {
6148 layout->add_eh_frame_for_plt(this,
6149 this->plt_eh_frame_cie,
6150 this->plt_eh_frame_cie_size,
6151 plt_eh_frame_fde,
6152 plt_eh_frame_fde_size);
6153 }
6154
6155 virtual void
6156 do_fill_first_plt_entry(unsigned char* pov,
6157 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
6158 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
6159
6160 virtual unsigned int
6161 do_fill_plt_entry(unsigned char* pov,
6162 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6163 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6164 unsigned int got_offset,
6165 unsigned int plt_offset,
6166 unsigned int plt_index);
6167
6168 virtual void
6169 do_fill_tlsdesc_entry(unsigned char* pov,
6170 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6171 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6172 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
6173 unsigned int tlsdesc_got_offset,
6174 unsigned int plt_offset);
6175
6176 private:
6177 // The size of an entry in the PLT.
6178 static const int plt_entry_size = 64;
6179
6180 // The first entry in the PLT.
6181 static const unsigned char first_plt_entry[plt_entry_size];
6182
6183 // Other entries in the PLT for an executable.
6184 static const unsigned char plt_entry[plt_entry_size];
6185
6186 // The reserved TLSDESC entry in the PLT for an executable.
6187 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
6188
6189 // The .eh_frame unwind information for the PLT.
6190 static const int plt_eh_frame_fde_size = 32;
6191 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
6192};
6193
6194template<int size>
6195class Target_x86_64_nacl : public Target_x86_64<size>
6196{
6197 public:
6198 Target_x86_64_nacl()
6199 : Target_x86_64<size>(&x86_64_nacl_info)
6200 { }
6201
6202 virtual Output_data_plt_x86_64<size>*
6203 do_make_data_plt(Layout* layout,
6204 Output_data_got<64, false>* got,
57b2284c 6205 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6206 Output_data_space* got_irelative)
6207 {
6208 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
6209 got_irelative);
6210 }
6211
6212 virtual Output_data_plt_x86_64<size>*
6213 do_make_data_plt(Layout* layout,
6214 Output_data_got<64, false>* got,
57b2284c 6215 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6216 Output_data_space* got_irelative,
6217 unsigned int plt_count)
6218 {
6219 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
6220 got_irelative,
6221 plt_count);
6222 }
6223
93f8221c
RM		 6224 virtual std::string
6225 do_code_fill(section_size_type length) const;
6226
2e702c99
RM		 6227 private:
6228 static const Target::Target_info x86_64_nacl_info;
6229};
6230
6231template<>
6232const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
6233{
6234 64, // size
6235 false, // is_big_endian
6236 elfcpp::EM_X86_64, // machine_code
6237 false, // has_make_symbol
6238 false, // has_resolve
6239 true, // has_code_fill
6240 true, // is_default_stack_executable
6241 true, // can_icf_inline_merge_sections
6242 '\0', // wrap_char
6243 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
6244 0x20000, // default_text_segment_address
6245 0x10000, // abi_pagesize (overridable by -z max-page-size)
6246 0x10000, // common_pagesize (overridable by -z common-page-size)
6247 true, // isolate_execinstr
6248 0x10000000, // rosegment_gap
6249 elfcpp::SHN_UNDEF, // small_common_shndx
6250 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
6251 0, // small_common_section_flags
6252 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
6253 NULL, // attributes_section
a67858e0 6254 NULL, // attributes_vendor
8d9743bd
MK		 6255 "_start", // entry_symbol_name
6256 32, // hash_entry_size
bce5a025 6257 elfcpp::SHT_X86_64_UNWIND, // unwind_section_type
2e702c99
RM		 6258};
6259
6260template<>
6261const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
6262{
6263 32, // size
6264 false, // is_big_endian
6265 elfcpp::EM_X86_64, // machine_code
6266 false, // has_make_symbol
6267 false, // has_resolve
6268 true, // has_code_fill
6269 true, // is_default_stack_executable
6270 true, // can_icf_inline_merge_sections
6271 '\0', // wrap_char
6272 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
6273 0x20000, // default_text_segment_address
6274 0x10000, // abi_pagesize (overridable by -z max-page-size)
6275 0x10000, // common_pagesize (overridable by -z common-page-size)
6276 true, // isolate_execinstr
6277 0x10000000, // rosegment_gap
6278 elfcpp::SHN_UNDEF, // small_common_shndx
6279 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
6280 0, // small_common_section_flags
6281 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
6282 NULL, // attributes_section
a67858e0 6283 NULL, // attributes_vendor
8d9743bd
MK		 6284 "_start", // entry_symbol_name
6285 32, // hash_entry_size
bce5a025 6286 elfcpp::SHT_X86_64_UNWIND, // unwind_section_type
2e702c99
RM		 6287};
6288
6289#define NACLMASK 0xe0 // 32-byte alignment mask.
6290
6291// The first entry in the PLT.
6292
6293template<int size>
6294const unsigned char
6295Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
6296{
6297 0xff, 0x35, // pushq contents of memory address
6298 0, 0, 0, 0, // replaced with address of .got + 8
6299 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
6300 0, 0, 0, 0, // replaced with address of .got + 16
6301 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
6302 0x4d, 0x01, 0xfb, // add %r15, %r11
6303 0x41, 0xff, 0xe3, // jmpq *%r11
6304
6305 // 9-byte nop sequence to pad out to the next 32-byte boundary.
dd0845d7 6306 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
2e702c99
RM		 6307
6308 // 32 bytes of nop to pad out to the standard size
6309 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6310 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6311 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6312 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6313 0x66, // excess data32 prefix
6314 0x90 // nop
6315};
6316
6317template<int size>
6318void
6319Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
6320 unsigned char* pov,
6321 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6322 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
6323{
6324 memcpy(pov, first_plt_entry, plt_entry_size);
6325 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
6326 (got_address + 8
6327 - (plt_address + 2 + 4)));
6328 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
6329 (got_address + 16
6330 - (plt_address + 9 + 4)));
6331}
6332
6333// Subsequent entries in the PLT.
6334
6335template<int size>
6336const unsigned char
6337Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
6338{
6339 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
6340 0, 0, 0, 0, // replaced with address of symbol in .got
6341 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
6342 0x4d, 0x01, 0xfb, // add %r15, %r11
6343 0x41, 0xff, 0xe3, // jmpq *%r11
6344
6345 // 15-byte nop sequence to pad out to the next 32-byte boundary.
6346 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6347 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6348
6349 // Lazy GOT entries point here (32-byte aligned).
6350 0x68, // pushq immediate
6351 0, 0, 0, 0, // replaced with index into relocation table
6352 0xe9, // jmp relative
6353 0, 0, 0, 0, // replaced with offset to start of .plt0
6354
6355 // 22 bytes of nop to pad out to the standard size.
6356 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6357 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6358 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
6359};
6360
6361template<int size>
6362unsigned int
6363Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
6364 unsigned char* pov,
6365 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6366 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6367 unsigned int got_offset,
6368 unsigned int plt_offset,
6369 unsigned int plt_index)
6370{
6371 memcpy(pov, plt_entry, plt_entry_size);
6372 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
6373 (got_address + got_offset
6374 - (plt_address + plt_offset
6375 + 3 + 4)));
6376
6377 elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
6378 elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
6379 - (plt_offset + 38 + 4));
6380
6381 return 32;
6382}
6383
6384// The reserved TLSDESC entry in the PLT.
6385
6386template<int size>
6387const unsigned char
6388Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
6389{
6390 0xff, 0x35, // pushq x(%rip)
6391 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
6392 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
6393 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
6394 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
6395 0x4d, 0x01, 0xfb, // add %r15, %r11
6396 0x41, 0xff, 0xe3, // jmpq *%r11
6397
6398 // 41 bytes of nop to pad out to the standard size.
6399 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6400 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6401 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6402 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6403 0x66, 0x66, // excess data32 prefixes
6404 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6405};
6406
6407template<int size>
6408void
6409Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
6410 unsigned char* pov,
6411 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6412 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6413 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
6414 unsigned int tlsdesc_got_offset,
6415 unsigned int plt_offset)
6416{
6417 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
6418 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
6419 (got_address + 8
6420 - (plt_address + plt_offset
6421 + 2 + 4)));
6422 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
6423 (got_base
6424 + tlsdesc_got_offset
6425 - (plt_address + plt_offset
6426 + 9 + 4)));
6427}
6428
6429// The .eh_frame unwind information for the PLT.
6430
6431template<int size>
6432const unsigned char
6433Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
6434{
6435 0, 0, 0, 0, // Replaced with offset to .plt.
6436 0, 0, 0, 0, // Replaced with size of .plt.
6437 0, // Augmentation size.
6438 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
6439 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
6440 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
6441 elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
6442 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
6443 13, // Block length.
6444 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
6445 elfcpp::DW_OP_breg16, 0, // Push %rip.
6446 elfcpp::DW_OP_const1u, 63, // Push 0x3f.
6447 elfcpp::DW_OP_and, // & (%rip & 0x3f).
6448 elfcpp::DW_OP_const1u, 37, // Push 0x25.
6449 elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
6450 elfcpp::DW_OP_lit3, // Push 3.
6451 elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
6452 elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
6453 elfcpp::DW_CFA_nop, // Align to 32 bytes.
6454 elfcpp::DW_CFA_nop
6455};
6456
93f8221c
RM		 6457// Return a string used to fill a code section with nops.
6458// For NaCl, long NOPs are only valid if they do not cross
6459// bundle alignment boundaries, so keep it simple with one-byte NOPs.
6460template<int size>
6461std::string
6462Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
6463{
6464 return std::string(length, static_cast<char>(0x90));
6465}
6466
2e702c99
RM		 6467// The selector for x86_64-nacl object files.
6468
6469template<int size>
6470class Target_selector_x86_64_nacl
6471 : public Target_selector_nacl<Target_selector_x86_64<size>,
6472 Target_x86_64_nacl<size> >
6473{
6474 public:
6475 Target_selector_x86_64_nacl()
6476 : Target_selector_nacl<Target_selector_x86_64<size>,
6477 Target_x86_64_nacl<size> >("x86-64",
6478 size == 64
6479 ? "elf64-x86-64-nacl"
6480 : "elf32-x86-64-nacl",
6481 size == 64
6482 ? "elf_x86_64_nacl"
6483 : "elf32_x86_64_nacl")
6484 { }
6485};
6486
6487Target_selector_x86_64_nacl<64> target_selector_x86_64;
6488Target_selector_x86_64_nacl<32> target_selector_x32;
2e30d253
ILT		 6489
6490} // End anonymous namespace.
GDB Binutils - Deliverables
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