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gdbserver: make aarch64_write_goto_address static
[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.
2089 unsigned int plt_offset = ((object->local_plt_offset(r_sym) - plt_entry_size)
2090 / (plt_entry_size / aplt_entry_size));
2091 return (this->address()
2092 + this->aplt_offset_
2093 + this->regular_count() * aplt_entry_size
2094 + plt_offset);
2095}
2096
2097// Set the final size.
2098void
2099Output_data_plt_x86_64_bnd::set_final_data_size()
2100{
2101 // Number of regular and IFUNC PLT entries.
2102 unsigned int count = this->entry_count();
2103 // Count the first entry and the TLSDESC entry, if present.
2104 unsigned int extra = this->has_tlsdesc_entry() ? 2 : 1;
2105 unsigned int plt_size = (count + extra) * plt_entry_size;
2106 // Offset of the APLT.
2107 this->aplt_offset_ = plt_size;
2108 // Size of the APLT.
2109 plt_size += count * aplt_entry_size;
2110 this->set_data_size(plt_size);
2111}
2112
2113// The first entry in the BND PLT.
2114
2115const unsigned char
2116Output_data_plt_x86_64_bnd::first_plt_entry[plt_entry_size] =
2117{
2118 // From AMD64 ABI Draft 0.98, page 76
2119 0xff, 0x35, // pushq contents of memory address
2120 0, 0, 0, 0, // replaced with address of .got + 8
2121 0xf2, 0xff, 0x25, // bnd jmp indirect
2122 0, 0, 0, 0, // replaced with address of .got + 16
2123 0x0f, 0x1f, 0x00 // nop
2124};
2125
2126void
2127Output_data_plt_x86_64_bnd::do_fill_first_plt_entry(
2128 unsigned char* pov,
6624f3a1
CC		 2129 elfcpp::Elf_types<64>::Elf_Addr got_address,
2130 elfcpp::Elf_types<64>::Elf_Addr plt_address)
7a0c0a14
CC		 2131{
2132 memcpy(pov, first_plt_entry, plt_entry_size);
2133 // We do a jmp relative to the PC at the end of this instruction.
2134 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2135 (got_address + 8
2136 - (plt_address + 6)));
2137 elfcpp::Swap<32, false>::writeval(pov + 9,
2138 (got_address + 16
2139 - (plt_address + 13)));
2140}
2141
2142// Subsequent entries in the BND PLT.
2143
2144const unsigned char
2145Output_data_plt_x86_64_bnd::plt_entry[plt_entry_size] =
2146{
2147 // From AMD64 ABI Draft 0.99.8, page 139
2148 0x68, // pushq immediate
2149 0, 0, 0, 0, // replaced with offset into relocation table
2150 0xf2, 0xe9, // bnd jmpq relative
2151 0, 0, 0, 0, // replaced with offset to start of .plt
2152 0x0f, 0x1f, 0x44, 0, 0 // nop
2153};
2154
2155// Entries in the BND Additional PLT.
2156
2157const unsigned char
2158Output_data_plt_x86_64_bnd::aplt_entry[aplt_entry_size] =
2159{
2160 // From AMD64 ABI Draft 0.99.8, page 139
2161 0xf2, 0xff, 0x25, // bnd jmpq indirect
2162 0, 0, 0, 0, // replaced with address of symbol in .got
2163 0x90, // nop
2164};
2165
2166unsigned int
2167Output_data_plt_x86_64_bnd::do_fill_plt_entry(
2168 unsigned char* pov,
6624f3a1
CC		 2169 elfcpp::Elf_types<64>::Elf_Addr,
2170 elfcpp::Elf_types<64>::Elf_Addr,
7a0c0a14
CC		 2171 unsigned int,
2172 unsigned int plt_offset,
2173 unsigned int plt_index)
2174{
2175 memcpy(pov, plt_entry, plt_entry_size);
2176 elfcpp::Swap_unaligned<32, false>::writeval(pov + 1, plt_index);
2177 elfcpp::Swap<32, false>::writeval(pov + 7, -(plt_offset + 11));
2178 return 0;
2179}
2180
2181void
2182Output_data_plt_x86_64_bnd::fill_aplt_entry(
2183 unsigned char* pov,
6624f3a1
CC		 2184 elfcpp::Elf_types<64>::Elf_Addr got_address,
2185 elfcpp::Elf_types<64>::Elf_Addr plt_address,
7a0c0a14
CC		 2186 unsigned int got_offset,
2187 unsigned int plt_offset,
2188 unsigned int plt_index)
2189{
2190 // Check PC-relative offset overflow in PLT entry.
2191 uint64_t plt_got_pcrel_offset = (got_address + got_offset
2192 - (plt_address + plt_offset + 7));
2193 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
2194 gold_error(_("PC-relative offset overflow in APLT entry %d"),
2195 plt_index + 1);
2196
2197 memcpy(pov, aplt_entry, aplt_entry_size);
2198 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, plt_got_pcrel_offset);
2199}
2200
2201// The reserved TLSDESC entry in the PLT for an executable.
2202
2203const unsigned char
2204Output_data_plt_x86_64_bnd::tlsdesc_plt_entry[plt_entry_size] =
2205{
2206 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
2207 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
2208 0xff, 0x35, // pushq x(%rip)
2209 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
2210 0xf2, 0xff, 0x25, // jmpq *y(%rip)
2211 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
2212 0x0f, 0x1f, 0 // nop
2213};
2214
2215void
2216Output_data_plt_x86_64_bnd::do_fill_tlsdesc_entry(
2217 unsigned char* pov,
6624f3a1
CC		 2218 elfcpp::Elf_types<64>::Elf_Addr got_address,
2219 elfcpp::Elf_types<64>::Elf_Addr plt_address,
2220 elfcpp::Elf_types<64>::Elf_Addr got_base,
7a0c0a14
CC		 2221 unsigned int tlsdesc_got_offset,
2222 unsigned int plt_offset)
2223{
2224 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
2225 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2226 (got_address + 8
2227 - (plt_address + plt_offset
2228 + 6)));
2229 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
2230 (got_base
2231 + tlsdesc_got_offset
2232 - (plt_address + plt_offset
2233 + 13)));
2234}
2235
750ea5ed
CC		 2236// Return the APLT address to use for a global symbol (for IBT).
2237
2238template<int size>
2239uint64_t
2240Output_data_plt_x86_64_ibt<size>::do_address_for_global(const Symbol* gsym)
2241{
2242 uint64_t offset = this->aplt_offset_;
2243 // Convert the PLT offset into an APLT offset.
2244 unsigned int plt_offset = gsym->plt_offset();
2245 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2246 && gsym->can_use_relative_reloc(false))
2247 offset += this->regular_count() * aplt_entry_size;
2248 else
2249 plt_offset -= plt_entry_size;
2250 plt_offset = plt_offset / (plt_entry_size / aplt_entry_size);
2251 return this->address() + offset + plt_offset;
2252}
2253
2254// Return the PLT address to use for a local symbol. These are always
2255// IRELATIVE relocs.
2256
2257template<int size>
2258uint64_t
2259Output_data_plt_x86_64_ibt<size>::do_address_for_local(const Relobj* object,
2260 unsigned int r_sym)
2261{
2262 // Convert the PLT offset into an APLT offset.
2263 unsigned int plt_offset = ((object->local_plt_offset(r_sym) - plt_entry_size)
2264 / (plt_entry_size / aplt_entry_size));
2265 return (this->address()
2266 + this->aplt_offset_
2267 + this->regular_count() * aplt_entry_size
2268 + plt_offset);
2269}
2270
2271// Set the final size.
2272
2273template<int size>
2274void
2275Output_data_plt_x86_64_ibt<size>::set_final_data_size()
2276{
2277 // Number of regular and IFUNC PLT entries.
2278 unsigned int count = this->entry_count();
2279 // Count the first entry and the TLSDESC entry, if present.
2280 unsigned int extra = this->has_tlsdesc_entry() ? 2 : 1;
2281 unsigned int plt_size = (count + extra) * plt_entry_size;
2282 // Offset of the APLT.
2283 this->aplt_offset_ = plt_size;
2284 // Size of the APLT.
2285 plt_size += count * aplt_entry_size;
2286 this->set_data_size(plt_size);
2287}
2288
2289// The first entry in the IBT PLT.
2290
2291template<>
2292const unsigned char
2293Output_data_plt_x86_64_ibt<32>::first_plt_entry[plt_entry_size] =
2294{
2295 // MPX isn't supported for x32, so we don't need the BND prefix.
2296 // From AMD64 ABI Draft 0.98, page 76
2297 0xff, 0x35, // pushq contents of memory address
2298 0, 0, 0, 0, // replaced with address of .got + 8
2299 0xff, 0x25, // jmp indirect
2300 0, 0, 0, 0, // replaced with address of .got + 16
2301 0x90, 0x90, 0x90, 0x90 // noop (x4)
2302};
2303
2304template<>
2305const unsigned char
2306Output_data_plt_x86_64_ibt<64>::first_plt_entry[plt_entry_size] =
2307{
2308 // Use the BND prefix so that IBT is compatible with MPX.
2309 0xff, 0x35, // pushq contents of memory address
2310 0, 0, 0, 0, // replaced with address of .got + 8
2311 0xf2, 0xff, 0x25, // bnd jmp indirect
2312 0, 0, 0, 0, // replaced with address of .got + 16
2313 0x0f, 0x1f, 0x00 // nop
2314};
2315
2316template<int size>
2317void
2318Output_data_plt_x86_64_ibt<size>::do_fill_first_plt_entry(
2319 unsigned char* pov,
2320 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2321 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
2322{
2323 // Offsets to the addresses needing relocation.
2324 const unsigned int roff1 = 2;
2325 const unsigned int roff2 = (size == 32) ? 8 : 9;
2326
2327 memcpy(pov, first_plt_entry, plt_entry_size);
2328 // We do a jmp relative to the PC at the end of this instruction.
2329 elfcpp::Swap_unaligned<32, false>::writeval(pov + roff1,
2330 (got_address + 8
2331 - (plt_address + roff1 + 4)));
2332 elfcpp::Swap<32, false>::writeval(pov + roff2,
2333 (got_address + 16
2334 - (plt_address + roff2 + 4)));
2335}
2336
2337// Subsequent entries in the IBT PLT.
2338
2339template<>
2340const unsigned char
2341Output_data_plt_x86_64_ibt<32>::plt_entry[plt_entry_size] =
2342{
2343 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2344 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2345 0x68, // pushq immediate
2346 0, 0, 0, 0, // replaced with offset into relocation table
2347 0xe9, // jmpq relative
2348 0, 0, 0, 0, // replaced with offset to start of .plt
2349 0x90, 0x90 // nop
2350};
2351
2352template<>
2353const unsigned char
2354Output_data_plt_x86_64_ibt<64>::plt_entry[plt_entry_size] =
2355{
2356 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2357 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2358 0x68, // pushq immediate
2359 0, 0, 0, 0, // replaced with offset into relocation table
2360 0xf2, 0xe9, // bnd jmpq relative
2361 0, 0, 0, 0, // replaced with offset to start of .plt
2362 0x90 // nop
2363};
2364
2365// Entries in the IBT Additional PLT.
2366
2367template<>
2368const unsigned char
2369Output_data_plt_x86_64_ibt<32>::aplt_entry[aplt_entry_size] =
2370{
2371 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2372 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2373 0xff, 0x25, // jmpq indirect
2374 0, 0, 0, 0, // replaced with address of symbol in .got
2375 0x0f, 0x1f, 0x04, 0x00, // nop
2376 0x90, 0x90 // nop
2377};
2378
2379template<>
2380const unsigned char
2381Output_data_plt_x86_64_ibt<64>::aplt_entry[aplt_entry_size] =
2382{
2383 // From AMD64 ABI Draft 1.0-rc1, Chapter 13.
2384 0xf3, 0x0f, 0x1e, 0xfa, // endbr64
2385 0xf2, 0xff, 0x25, // bnd jmpq indirect
2386 0, 0, 0, 0, // replaced with address of symbol in .got
2387 0x0f, 0x1f, 0x04, 0x00, // nop
2388 0x90, // nop
2389};
2390
2391template<int size>
2392unsigned int
2393Output_data_plt_x86_64_ibt<size>::do_fill_plt_entry(
2394 unsigned char* pov,
2395 typename elfcpp::Elf_types<size>::Elf_Addr,
2396 typename elfcpp::Elf_types<size>::Elf_Addr,
2397 unsigned int,
2398 unsigned int plt_offset,
2399 unsigned int plt_index)
2400{
2401 // Offsets to the addresses needing relocation.
2402 const unsigned int roff1 = 5;
2403 const unsigned int roff2 = (size == 32) ? 10 : 11;
2404
2405 memcpy(pov, plt_entry, plt_entry_size);
2406 elfcpp::Swap_unaligned<32, false>::writeval(pov + roff1, plt_index);
2407 elfcpp::Swap<32, false>::writeval(pov + roff2, -(plt_offset + roff2 + 4));
2408 return 0;
2409}
2410
2411template<int size>
2412void
2413Output_data_plt_x86_64_ibt<size>::fill_aplt_entry(
2414 unsigned char* pov,
2415 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2416 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
2417 unsigned int got_offset,
2418 unsigned int plt_offset,
2419 unsigned int plt_index)
2420{
2421 // Offset to the address needing relocation.
2422 const unsigned int roff = (size == 32) ? 6 : 7;
2423
2424 // Check PC-relative offset overflow in PLT entry.
2425 uint64_t plt_got_pcrel_offset = (got_address + got_offset
2426 - (plt_address + plt_offset + roff + 4));
2427 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
2428 gold_error(_("PC-relative offset overflow in APLT entry %d"),
2429 plt_index + 1);
2430
2431 memcpy(pov, aplt_entry, aplt_entry_size);
2432 elfcpp::Swap_unaligned<32, false>::writeval(pov + roff, plt_got_pcrel_offset);
2433}
2434
2435// The reserved TLSDESC entry in the IBT PLT for an executable.
2436
2437template<int size>
2438const unsigned char
2439Output_data_plt_x86_64_ibt<size>::tlsdesc_plt_entry[plt_entry_size] =
2440{
2441 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
2442 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
2443 0xff, 0x35, // pushq x(%rip)
2444 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
2445 0xf2, 0xff, 0x25, // jmpq *y(%rip)
2446 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
2447 0x0f, 0x1f, 0 // nop
2448};
2449
2450template<int size>
2451void
2452Output_data_plt_x86_64_ibt<size>::do_fill_tlsdesc_entry(
2453 unsigned char* pov,
2454 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
2455 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
2456 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
2457 unsigned int tlsdesc_got_offset,
2458 unsigned int plt_offset)
2459{
2460 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
2461 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
2462 (got_address + 8
2463 - (plt_address + plt_offset
2464 + 6)));
2465 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
2466 (got_base
2467 + tlsdesc_got_offset
2468 - (plt_address + plt_offset
2469 + 13)));
2470}
2471
07a60597
ILT		 2472// The .eh_frame unwind information for the PLT.
2473
fc51264f 2474template<int size>
2e702c99 2475const unsigned char
fc51264f 2476Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
07a60597
ILT		 2477{
2478 1, // CIE version.
2479 'z', // Augmentation: augmentation size included.
2480 'R', // Augmentation: FDE encoding included.
2481 '\0', // End of augmentation string.
2482 1, // Code alignment factor.
2483 0x78, // Data alignment factor.
2484 16, // Return address column.
2485 1, // Augmentation size.
2486 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
2487 | elfcpp::DW_EH_PE_sdata4),
2488 elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
2489 elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
2490 elfcpp::DW_CFA_nop, // Align to 16 bytes.
2491 elfcpp::DW_CFA_nop
2492};
2493
fc51264f 2494template<int size>
07a60597 2495const unsigned char
2e702c99 2496Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
07a60597
ILT		 2497{
2498 0, 0, 0, 0, // Replaced with offset to .plt.
2499 0, 0, 0, 0, // Replaced with size of .plt.
2500 0, // Augmentation size.
2501 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
2502 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
2503 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
2504 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
2505 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
2506 11, // Block length.
2507 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
2508 elfcpp::DW_OP_breg16, 0, // Push %rip.
2509 elfcpp::DW_OP_lit15, // Push 0xf.
2510 elfcpp::DW_OP_and, // & (%rip & 0xf).
2511 elfcpp::DW_OP_lit11, // Push 0xb.
2512 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
2513 elfcpp::DW_OP_lit3, // Push 3.
2514 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
2515 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
2516 elfcpp::DW_CFA_nop, // Align to 32 bytes.
2517 elfcpp::DW_CFA_nop,
2518 elfcpp::DW_CFA_nop,
2519 elfcpp::DW_CFA_nop
2520};
2521
7a0c0a14
CC		 2522// The .eh_frame unwind information for the BND PLT.
2523const unsigned char
2524Output_data_plt_x86_64_bnd::plt_eh_frame_fde[plt_eh_frame_fde_size] =
2525{
2526 0, 0, 0, 0, // Replaced with offset to .plt.
2527 0, 0, 0, 0, // Replaced with size of .plt.
2528 0, // Augmentation size.
2529 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
2530 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
2531 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
2532 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
2533 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
2534 11, // Block length.
2535 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
2536 elfcpp::DW_OP_breg16, 0, // Push %rip.
2537 elfcpp::DW_OP_lit15, // Push 0xf.
2538 elfcpp::DW_OP_and, // & (%rip & 0xf).
2539 elfcpp::DW_OP_lit5, // Push 5.
2540 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 5)
2541 elfcpp::DW_OP_lit3, // Push 3.
2542 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 5) << 3)
2543 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=5)<<3)+%rsp+8
2544 elfcpp::DW_CFA_nop, // Align to 32 bytes.
2545 elfcpp::DW_CFA_nop,
2546 elfcpp::DW_CFA_nop,
2547 elfcpp::DW_CFA_nop
2548};
2549
750ea5ed
CC		 2550// The .eh_frame unwind information for the BND PLT.
2551template<int size>
2552const unsigned char
2553Output_data_plt_x86_64_ibt<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
2554{
2555 0, 0, 0, 0, // Replaced with offset to .plt.
2556 0, 0, 0, 0, // Replaced with size of .plt.
2557 0, // Augmentation size.
2558 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
2559 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
2560 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
2561 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
2562 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
2563 11, // Block length.
2564 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
2565 elfcpp::DW_OP_breg16, 0, // Push %rip.
2566 elfcpp::DW_OP_lit15, // Push 0xf.
2567 elfcpp::DW_OP_and, // & (%rip & 0xf).
2568 elfcpp::DW_OP_lit9, // Push 9.
2569 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 9)
2570 elfcpp::DW_OP_lit3, // Push 3.
2571 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 9) << 3)
2572 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=9)<<3)+%rsp+8
2573 elfcpp::DW_CFA_nop, // Align to 32 bytes.
2574 elfcpp::DW_CFA_nop,
2575 elfcpp::DW_CFA_nop,
2576 elfcpp::DW_CFA_nop
2577};
2578
2e30d253
ILT		 2579// Write out the PLT. This uses the hand-coded instructions above,
2580// and adjusts them as needed. This is specified by the AMD64 ABI.
2581
fc51264f 2582template<int size>
2e30d253 2583void
fc51264f 2584Output_data_plt_x86_64<size>::do_write(Output_file* of)
2e30d253 2585{
2ea97941 2586 const off_t offset = this->offset();
fe8718a4
ILT		 2587 const section_size_type oview_size =
2588 convert_to_section_size_type(this->data_size());
2ea97941 2589 unsigned char* const oview = of->get_output_view(offset, oview_size);
2e30d253
ILT		 2590
2591 const off_t got_file_offset = this->got_plt_->offset();
67181c72
ILT		 2592 gold_assert(parameters->incremental_update()
2593 || (got_file_offset + this->got_plt_->data_size()
2594 == this->got_irelative_->offset()));
fe8718a4 2595 const section_size_type got_size =
67181c72
ILT		 2596 convert_to_section_size_type(this->got_plt_->data_size()
2597 + this->got_irelative_->data_size());
2e30d253
ILT		 2598 unsigned char* const got_view = of->get_output_view(got_file_offset,
2599 got_size);
2600
2601 unsigned char* pov = oview;
2602
c2b45e22 2603 // The base address of the .plt section.
fc51264f 2604 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
c2b45e22 2605 // The base address of the .got section.
fc51264f 2606 typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
c2b45e22
CC		 2607 // The base address of the PLT portion of the .got section,
2608 // which is where the GOT pointer will point, and where the
2609 // three reserved GOT entries are located.
fc51264f
L		 2610 typename elfcpp::Elf_types<size>::Elf_Addr got_address
2611 = this->got_plt_->address();
2e30d253 2612
2e702c99
RM		 2613 this->fill_first_plt_entry(pov, got_address, plt_address);
2614 pov += this->get_plt_entry_size();
2e30d253 2615
57b2284c
CC		 2616 // The first three entries in the GOT are reserved, and are written
2617 // by Output_data_got_plt_x86_64::do_write.
2618 unsigned char* got_pov = got_view + 24;
2e30d253 2619
2e702c99 2620 unsigned int plt_offset = this->get_plt_entry_size();
2e30d253 2621 unsigned int got_offset = 24;
67181c72 2622 const unsigned int count = this->count_ + this->irelative_count_;
2e30d253
ILT		 2623 for (unsigned int plt_index = 0;
2624 plt_index < count;
2625 ++plt_index,
2e702c99 2626 pov += this->get_plt_entry_size(),
2e30d253 2627 got_pov += 8,
2e702c99 2628 plt_offset += this->get_plt_entry_size(),
2e30d253
ILT		 2629 got_offset += 8)
2630 {
2631 // Set and adjust the PLT entry itself.
2e702c99
RM		 2632 unsigned int lazy_offset = this->fill_plt_entry(pov,
2633 got_address, plt_address,
2634 got_offset, plt_offset,
2635 plt_index);
2e30d253
ILT		 2636
2637 // Set the entry in the GOT.
2e702c99
RM		 2638 elfcpp::Swap<64, false>::writeval(got_pov,
2639 plt_address + plt_offset + lazy_offset);
2e30d253
ILT		 2640 }
2641
c2b45e22
CC		 2642 if (this->has_tlsdesc_entry())
2643 {
2644 // Set and adjust the reserved TLSDESC PLT entry.
2645 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2e702c99
RM		 2646 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
2647 tlsdesc_got_offset, plt_offset);
2648 pov += this->get_plt_entry_size();
c2b45e22
CC		 2649 }
2650
fe8718a4
ILT		 2651 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
2652 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2e30d253 2653
2ea97941 2654 of->write_output_view(offset, oview_size, oview);
2e30d253
ILT		 2655 of->write_output_view(got_file_offset, got_size, got_view);
2656}
2657
7a0c0a14
CC		 2658// Write out the BND PLT.
2659
2660void
2661Output_data_plt_x86_64_bnd::do_write(Output_file* of)
2662{
2663 const off_t offset = this->offset();
2664 const section_size_type oview_size =
2665 convert_to_section_size_type(this->data_size());
2666 unsigned char* const oview = of->get_output_view(offset, oview_size);
2667
2668 Output_data_got<64, false>* got = this->got();
2669 Output_data_got_plt_x86_64* got_plt = this->got_plt();
2670 Output_data_space* got_irelative = this->got_irelative();
2671
2672 const off_t got_file_offset = got_plt->offset();
2673 gold_assert(parameters->incremental_update()
2674 || (got_file_offset + got_plt->data_size()
2675 == got_irelative->offset()));
2676 const section_size_type got_size =
2677 convert_to_section_size_type(got_plt->data_size()
2678 + got_irelative->data_size());
2679 unsigned char* const got_view = of->get_output_view(got_file_offset,
2680 got_size);
2681
2682 unsigned char* pov = oview;
2683
2684 // The base address of the .plt section.
6624f3a1 2685 elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address();
7a0c0a14 2686 // The base address of the .got section.
6624f3a1 2687 elfcpp::Elf_types<64>::Elf_Addr got_base = got->address();
7a0c0a14
CC		 2688 // The base address of the PLT portion of the .got section,
2689 // which is where the GOT pointer will point, and where the
2690 // three reserved GOT entries are located.
6624f3a1 2691 elfcpp::Elf_types<64>::Elf_Addr got_address = got_plt->address();
7a0c0a14
CC		 2692
2693 this->fill_first_plt_entry(pov, got_address, plt_address);
2694 pov += plt_entry_size;
2695
2696 // The first three entries in the GOT are reserved, and are written
2697 // by Output_data_got_plt_x86_64::do_write.
2698 unsigned char* got_pov = got_view + 24;
2699
2700 unsigned int plt_offset = plt_entry_size;
2701 unsigned int got_offset = 24;
2702 const unsigned int count = this->entry_count();
2703 for (unsigned int plt_index = 0;
2704 plt_index < count;
2705 ++plt_index,
2706 pov += plt_entry_size,
2707 got_pov += 8,
2708 plt_offset += plt_entry_size,
2709 got_offset += 8)
2710 {
2711 // Set and adjust the PLT entry itself.
2712 unsigned int lazy_offset = this->fill_plt_entry(pov,
2713 got_address, plt_address,
2714 got_offset, plt_offset,
2715 plt_index);
2716
2717 // Set the entry in the GOT.
2718 elfcpp::Swap<64, false>::writeval(got_pov,
2719 plt_address + plt_offset + lazy_offset);
2720 }
2721
2722 if (this->has_tlsdesc_entry())
2723 {
2724 // Set and adjust the reserved TLSDESC PLT entry.
2725 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2726 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
2727 tlsdesc_got_offset, plt_offset);
2728 pov += this->get_plt_entry_size();
2729 }
2730
2731 // Write the additional PLT.
2732 got_offset = 24;
2733 for (unsigned int plt_index = 0;
2734 plt_index < count;
2735 ++plt_index,
2736 pov += aplt_entry_size,
2737 plt_offset += aplt_entry_size,
2738 got_offset += 8)
750ea5ed
CC		 2739 {
2740 // Set and adjust the APLT entry.
2741 this->fill_aplt_entry(pov, got_address, plt_address, got_offset,
2742 plt_offset, plt_index);
2743 }
2744
2745 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
2746 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2747
2748 of->write_output_view(offset, oview_size, oview);
2749 of->write_output_view(got_file_offset, got_size, got_view);
2750}
2751
2752// Write out the IBT PLT.
2753
2754template<int size>
2755void
2756Output_data_plt_x86_64_ibt<size>::do_write(Output_file* of)
2757{
2758 const off_t offset = this->offset();
2759 const section_size_type oview_size =
2760 convert_to_section_size_type(this->data_size());
2761 unsigned char* const oview = of->get_output_view(offset, oview_size);
2762
2763 Output_data_got<64, false>* got = this->got();
2764 Output_data_got_plt_x86_64* got_plt = this->got_plt();
2765 Output_data_space* got_irelative = this->got_irelative();
2766
2767 const off_t got_file_offset = got_plt->offset();
2768 gold_assert(parameters->incremental_update()
2769 || (got_file_offset + got_plt->data_size()
2770 == got_irelative->offset()));
2771 const section_size_type got_size =
2772 convert_to_section_size_type(got_plt->data_size()
2773 + got_irelative->data_size());
2774 unsigned char* const got_view = of->get_output_view(got_file_offset,
2775 got_size);
2776
2777 unsigned char* pov = oview;
2778
2779 // The base address of the .plt section.
2780 elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address();
2781 // The base address of the .got section.
2782 elfcpp::Elf_types<64>::Elf_Addr got_base = got->address();
2783 // The base address of the PLT portion of the .got section,
2784 // which is where the GOT pointer will point, and where the
2785 // three reserved GOT entries are located.
2786 elfcpp::Elf_types<64>::Elf_Addr got_address = got_plt->address();
2787
2788 this->fill_first_plt_entry(pov, got_address, plt_address);
2789 pov += plt_entry_size;
2790
2791 // The first three entries in the GOT are reserved, and are written
2792 // by Output_data_got_plt_x86_64::do_write.
2793 unsigned char* got_pov = got_view + 24;
2794
2795 unsigned int plt_offset = plt_entry_size;
2796 unsigned int got_offset = 24;
2797 const unsigned int count = this->entry_count();
2798 for (unsigned int plt_index = 0;
2799 plt_index < count;
2800 ++plt_index,
2801 pov += plt_entry_size,
2802 got_pov += 8,
2803 plt_offset += plt_entry_size,
2804 got_offset += 8)
7a0c0a14
CC		 2805 {
2806 // Set and adjust the PLT entry itself.
750ea5ed
CC		 2807 unsigned int lazy_offset = this->fill_plt_entry(pov,
2808 got_address, plt_address,
2809 got_offset, plt_offset,
2810 plt_index);
2811
2812 // Set the entry in the GOT.
2813 elfcpp::Swap<64, false>::writeval(got_pov,
2814 plt_address + plt_offset + lazy_offset);
2815 }
2816
2817 if (this->has_tlsdesc_entry())
2818 {
2819 // Set and adjust the reserved TLSDESC PLT entry.
2820 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2821 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
2822 tlsdesc_got_offset, plt_offset);
2823 pov += this->get_plt_entry_size();
2824 }
2825
2826 // Write the additional PLT.
2827 got_offset = 24;
2828 for (unsigned int plt_index = 0;
2829 plt_index < count;
2830 ++plt_index,
2831 pov += aplt_entry_size,
2832 plt_offset += aplt_entry_size,
2833 got_offset += 8)
2834 {
2835 // Set and adjust the APLT entry.
7a0c0a14
CC		 2836 this->fill_aplt_entry(pov, got_address, plt_address, got_offset,
2837 plt_offset, plt_index);
2838 }
2839
2840 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
2841 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2842
2843 of->write_output_view(offset, oview_size, oview);
2844 of->write_output_view(got_file_offset, got_size, got_view);
2845}
2846
c2b45e22 2847// Create the PLT section.
2e30d253 2848
fc51264f 2849template<int size>
2e30d253 2850void
fc51264f 2851Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
2e30d253 2852{
2e30d253
ILT		 2853 if (this->plt_ == NULL)
2854 {
2855 // Create the GOT sections first.
2856 this->got_section(symtab, layout);
2857
2e702c99
RM		 2858 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
2859 this->got_irelative_);
2860
2861 // Add unwind information if requested.
2862 if (parameters->options().ld_generated_unwind_info())
2863 this->plt_->add_eh_frame(layout);
2864
2e30d253
ILT		 2865 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
2866 (elfcpp::SHF_ALLOC
2867 | elfcpp::SHF_EXECINSTR),
22f0da72 2868 this->plt_, ORDER_PLT, false);
7223e9ca
ILT		 2869
2870 // Make the sh_info field of .rela.plt point to .plt.
2871 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
2872 rela_plt_os->set_info_section(this->plt_->output_section());
2e30d253 2873 }
c2b45e22
CC		 2874}
2875
7a0c0a14
CC		 2876template<>
2877Output_data_plt_x86_64<32>*
2878Target_x86_64<32>::do_make_data_plt(Layout* layout,
2879 Output_data_got<64, false>* got,
2880 Output_data_got_plt_x86_64* got_plt,
2881 Output_data_space* got_irelative)
2882{
750ea5ed
CC		 2883 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2884 return new Output_data_plt_x86_64_ibt<32>(layout, got, got_plt,
2885 got_irelative);
7a0c0a14
CC		 2886 return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt,
2887 got_irelative);
2888}
2889
2890template<>
2891Output_data_plt_x86_64<64>*
2892Target_x86_64<64>::do_make_data_plt(Layout* layout,
2893 Output_data_got<64, false>* got,
2894 Output_data_got_plt_x86_64* got_plt,
2895 Output_data_space* got_irelative)
2896{
750ea5ed
CC		 2897 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2898 return new Output_data_plt_x86_64_ibt<64>(layout, got, got_plt,
2899 got_irelative);
2900 else if (parameters->options().bndplt())
7a0c0a14
CC		 2901 return new Output_data_plt_x86_64_bnd(layout, got, got_plt,
2902 got_irelative);
2903 else
2904 return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt,
2905 got_irelative);
2906}
2907
2908template<>
2909Output_data_plt_x86_64<32>*
2910Target_x86_64<32>::do_make_data_plt(Layout* layout,
2911 Output_data_got<64, false>* got,
2912 Output_data_got_plt_x86_64* got_plt,
2913 Output_data_space* got_irelative,
2914 unsigned int plt_count)
2915{
750ea5ed
CC		 2916 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2917 return new Output_data_plt_x86_64_ibt<32>(layout, got, got_plt,
2918 got_irelative, plt_count);
7a0c0a14 2919 return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt,
750ea5ed 2920 got_irelative, plt_count);
7a0c0a14
CC		 2921}
2922
2923template<>
2924Output_data_plt_x86_64<64>*
2925Target_x86_64<64>::do_make_data_plt(Layout* layout,
2926 Output_data_got<64, false>* got,
2927 Output_data_got_plt_x86_64* got_plt,
2928 Output_data_space* got_irelative,
2929 unsigned int plt_count)
2930{
750ea5ed
CC		 2931 if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT)
2932 return new Output_data_plt_x86_64_ibt<64>(layout, got, got_plt,
2933 got_irelative, plt_count);
2934 else if (parameters->options().bndplt())
7a0c0a14
CC		 2935 return new Output_data_plt_x86_64_bnd(layout, got, got_plt,
2936 got_irelative, plt_count);
2937 else
2938 return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt,
2939 got_irelative,
2940 plt_count);
2941}
2942
e291e7b9
ILT		 2943// Return the section for TLSDESC relocations.
2944
fc51264f
L		 2945template<int size>
2946typename Target_x86_64<size>::Reloc_section*
2947Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
e291e7b9
ILT		 2948{
2949 return this->plt_section()->rela_tlsdesc(layout);
2950}
2951
c2b45e22
CC		 2952// Create a PLT entry for a global symbol.
2953
fc51264f 2954template<int size>
c2b45e22 2955void
fc51264f
L		 2956Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
2957 Symbol* gsym)
c2b45e22
CC		 2958{
2959 if (gsym->has_plt_offset())
2960 return;
2961
2962 if (this->plt_ == NULL)
2963 this->make_plt_section(symtab, layout);
2e30d253 2964
67181c72 2965 this->plt_->add_entry(symtab, layout, gsym);
2e30d253
ILT		 2966}
2967
7223e9ca
ILT		 2968// Make a PLT entry for a local STT_GNU_IFUNC symbol.
2969
fc51264f 2970template<int size>
7223e9ca 2971void
fc51264f
L		 2972Target_x86_64<size>::make_local_ifunc_plt_entry(
2973 Symbol_table* symtab, Layout* layout,
2974 Sized_relobj_file<size, false>* relobj,
2975 unsigned int local_sym_index)
7223e9ca
ILT		 2976{
2977 if (relobj->local_has_plt_offset(local_sym_index))
2978 return;
2979 if (this->plt_ == NULL)
2980 this->make_plt_section(symtab, layout);
67181c72
ILT		 2981 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
2982 relobj,
7223e9ca
ILT		 2983 local_sym_index);
2984 relobj->set_local_plt_offset(local_sym_index, plt_offset);
2985}
2986
0e70b911
CC		 2987// Return the number of entries in the PLT.
2988
fc51264f 2989template<int size>
0e70b911 2990unsigned int
fc51264f 2991Target_x86_64<size>::plt_entry_count() const
0e70b911
CC		 2992{
2993 if (this->plt_ == NULL)
2994 return 0;
2995 return this->plt_->entry_count();
2996}
2997
2998// Return the offset of the first non-reserved PLT entry.
2999
fc51264f 3000template<int size>
0e70b911 3001unsigned int
fc51264f 3002Target_x86_64<size>::first_plt_entry_offset() const
0e70b911 3003{
8474a88f
L		 3004 if (this->plt_ == NULL)
3005 return 0;
2e702c99 3006 return this->plt_->first_plt_entry_offset();
0e70b911
CC		 3007}
3008
3009// Return the size of each PLT entry.
3010
fc51264f 3011template<int size>
0e70b911 3012unsigned int
fc51264f 3013Target_x86_64<size>::plt_entry_size() const
0e70b911 3014{
8474a88f
L		 3015 if (this->plt_ == NULL)
3016 return 0;
2e702c99 3017 return this->plt_->get_plt_entry_size();
0e70b911
CC		 3018}
3019
4829d394
CC		 3020// Create the GOT and PLT sections for an incremental update.
3021
fc51264f 3022template<int size>
dd74ae06 3023Output_data_got_base*
fc51264f 3024Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
4829d394
CC		 3025 Layout* layout,
3026 unsigned int got_count,
3027 unsigned int plt_count)
3028{
3029 gold_assert(this->got_ == NULL);
3030
3031 this->got_ = new Output_data_got<64, false>(got_count * 8);
3032 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
3033 (elfcpp::SHF_ALLOC
3034 | elfcpp::SHF_WRITE),
3035 this->got_, ORDER_RELRO_LAST,
3036 true);
3037
3038 // Add the three reserved entries.
57b2284c 3039 this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
4829d394
CC		 3040 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3041 (elfcpp::SHF_ALLOC
3042 | elfcpp::SHF_WRITE),
3043 this->got_plt_, ORDER_NON_RELRO_FIRST,
3044 false);
3045
3046 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
3047 this->global_offset_table_ =
3048 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
3049 Symbol_table::PREDEFINED,
3050 this->got_plt_,
3051 0, 0, elfcpp::STT_OBJECT,
3052 elfcpp::STB_LOCAL,
3053 elfcpp::STV_HIDDEN, 0,
3054 false, false);
3055
3056 // If there are any TLSDESC relocations, they get GOT entries in
3057 // .got.plt after the jump slot entries.
3058 // FIXME: Get the count for TLSDESC entries.
3059 this->got_tlsdesc_ = new Output_data_got<64, false>(0);
3060 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3061 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
3062 this->got_tlsdesc_,
3063 ORDER_NON_RELRO_FIRST, false);
3064
67181c72
ILT		 3065 // If there are any IRELATIVE relocations, they get GOT entries in
3066 // .got.plt after the jump slot and TLSDESC entries.
3067 this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
3068 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
3069 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
3070 this->got_irelative_,
3071 ORDER_NON_RELRO_FIRST, false);
3072
4829d394 3073 // Create the PLT section.
2e702c99
RM		 3074 this->plt_ = this->make_data_plt(layout, this->got_,
3075 this->got_plt_,
3076 this->got_irelative_,
3077 plt_count);
3078
3079 // Add unwind information if requested.
3080 if (parameters->options().ld_generated_unwind_info())
3081 this->plt_->add_eh_frame(layout);
3082
4829d394
CC		 3083 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
3084 elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
3085 this->plt_, ORDER_PLT, false);
3086
3087 // Make the sh_info field of .rela.plt point to .plt.
3088 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
3089 rela_plt_os->set_info_section(this->plt_->output_section());
3090
6fa2a40b
CC		 3091 // Create the rela_dyn section.
3092 this->rela_dyn_section(layout);
3093
4829d394
CC		 3094 return this->got_;
3095}
3096
6fa2a40b
CC		 3097// Reserve a GOT entry for a local symbol, and regenerate any
3098// necessary dynamic relocations.
3099
fc51264f 3100template<int size>
6fa2a40b 3101void
fc51264f 3102Target_x86_64<size>::reserve_local_got_entry(
6fa2a40b 3103 unsigned int got_index,
fc51264f 3104 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 3105 unsigned int r_sym,
3106 unsigned int got_type)
3107{
3108 unsigned int got_offset = got_index * 8;
3109 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
3110
3111 this->got_->reserve_local(got_index, obj, r_sym, got_type);
3112 switch (got_type)
3113 {
3114 case GOT_TYPE_STANDARD:
3115 if (parameters->options().output_is_position_independent())
3116 rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
397b129b 3117 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3118 break;
3119 case GOT_TYPE_TLS_OFFSET:
3120 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
3121 this->got_, got_offset, 0);
3122 break;
3123 case GOT_TYPE_TLS_PAIR:
3124 this->got_->reserve_slot(got_index + 1);
3125 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
3126 this->got_, got_offset, 0);
3127 break;
3128 case GOT_TYPE_TLS_DESC:
3129 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
3130 // this->got_->reserve_slot(got_index + 1);
3131 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
3132 // this->got_, got_offset, 0);
3133 break;
3134 default:
3135 gold_unreachable();
3136 }
3137}
3138
3139// Reserve a GOT entry for a global symbol, and regenerate any
3140// necessary dynamic relocations.
3141
fc51264f 3142template<int size>
6fa2a40b 3143void
fc51264f
L		 3144Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
3145 Symbol* gsym,
3146 unsigned int got_type)
6fa2a40b
CC		 3147{
3148 unsigned int got_offset = got_index * 8;
3149 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
3150
3151 this->got_->reserve_global(got_index, gsym, got_type);
3152 switch (got_type)
3153 {
3154 case GOT_TYPE_STANDARD:
3155 if (!gsym->final_value_is_known())
3156 {
3157 if (gsym->is_from_dynobj()
3158 || gsym->is_undefined()
3159 || gsym->is_preemptible()
3160 || gsym->type() == elfcpp::STT_GNU_IFUNC)
3161 rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
3162 this->got_, got_offset, 0);
3163 else
3164 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
13cf9988 3165 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3166 }
3167 break;
3168 case GOT_TYPE_TLS_OFFSET:
3169 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
13cf9988 3170 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3171 break;
3172 case GOT_TYPE_TLS_PAIR:
3173 this->got_->reserve_slot(got_index + 1);
3174 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
13cf9988 3175 this->got_, got_offset, 0, false);
6fa2a40b 3176 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
13cf9988 3177 this->got_, got_offset + 8, 0, false);
6fa2a40b
CC		 3178 break;
3179 case GOT_TYPE_TLS_DESC:
3180 this->got_->reserve_slot(got_index + 1);
3181 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
13cf9988 3182 this->got_, got_offset, 0, false);
6fa2a40b
CC		 3183 break;
3184 default:
3185 gold_unreachable();
3186 }
3187}
3188
4829d394
CC		 3189// Register an existing PLT entry for a global symbol.
3190
fc51264f 3191template<int size>
4829d394 3192void
fc51264f
L		 3193Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
3194 Layout* layout,
3195 unsigned int plt_index,
3196 Symbol* gsym)
4829d394
CC		 3197{
3198 gold_assert(this->plt_ != NULL);
3199 gold_assert(!gsym->has_plt_offset());
3200
3201 this->plt_->reserve_slot(plt_index);
3202
3203 gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
3204
3205 unsigned int got_offset = (plt_index + 3) * 8;
67181c72 3206 this->plt_->add_relocation(symtab, layout, gsym, got_offset);
4829d394
CC		 3207}
3208
26d3c67d
CC		 3209// Force a COPY relocation for a given symbol.
3210
fc51264f 3211template<int size>
26d3c67d 3212void
fc51264f 3213Target_x86_64<size>::emit_copy_reloc(
26d3c67d
CC		 3214 Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
3215{
3216 this->copy_relocs_.emit_copy_reloc(symtab,
fc51264f 3217 symtab->get_sized_symbol<size>(sym),
26d3c67d
CC		 3218 os,
3219 offset,
3220 this->rela_dyn_section(NULL));
3221}
3222
9fa33bee 3223// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029 3224
fc51264f 3225template<int size>
edfbb029 3226void
fc51264f
L		 3227Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
3228 Layout* layout)
edfbb029
CC		 3229{
3230 if (this->tls_base_symbol_defined_)
3231 return;
3232
3233 Output_segment* tls_segment = layout->tls_segment();
3234 if (tls_segment != NULL)
3235 {
183fd0e3 3236 bool is_exec = parameters->options().output_is_executable();
edfbb029 3237 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 3238 Symbol_table::PREDEFINED,
edfbb029
CC		 3239 tls_segment, 0, 0,
3240 elfcpp::STT_TLS,
3241 elfcpp::STB_LOCAL,
3242 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 3243 (is_exec
3244 ? Symbol::SEGMENT_END
3245 : Symbol::SEGMENT_START),
3246 true);
edfbb029
CC		 3247 }
3248 this->tls_base_symbol_defined_ = true;
3249}
3250
c2b45e22
CC		 3251// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
3252
fc51264f 3253template<int size>
c2b45e22 3254void
fc51264f 3255Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2e702c99 3256 Layout* layout)
c2b45e22
CC		 3257{
3258 if (this->plt_ == NULL)
3259 this->make_plt_section(symtab, layout);
3260
3261 if (!this->plt_->has_tlsdesc_entry())
3262 {
3263 // Allocate the TLSDESC_GOT entry.
3264 Output_data_got<64, false>* got = this->got_section(symtab, layout);
3265 unsigned int got_offset = got->add_constant(0);
3266
3267 // Allocate the TLSDESC_PLT entry.
3268 this->plt_->reserve_tlsdesc_entry(got_offset);
3269 }
3270}
3271
31d60480
ILT		 3272// Create a GOT entry for the TLS module index.
3273
fc51264f 3274template<int size>
31d60480 3275unsigned int
fc51264f
L		 3276Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
3277 Sized_relobj_file<size, false>* object)
31d60480
ILT		 3278{
3279 if (this->got_mod_index_offset_ == -1U)
3280 {
3281 gold_assert(symtab != NULL && layout != NULL && object != NULL);
3282 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
3283 Output_data_got<64, false>* got = this->got_section(symtab, layout);
3284 unsigned int got_offset = got->add_constant(0);
3285 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2e702c99 3286 got_offset, 0);
009a67a2 3287 got->add_constant(0);
31d60480
ILT		 3288 this->got_mod_index_offset_ = got_offset;
3289 }
3290 return this->got_mod_index_offset_;
3291}
3292
2e30d253
ILT		 3293// Optimize the TLS relocation type based on what we know about the
3294// symbol. IS_FINAL is true if the final address of this symbol is
3295// known at link time.
3296
fc51264f 3297template<int size>
e041f13d 3298tls::Tls_optimization
fc51264f 3299Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2e30d253 3300{
2e30d253
ILT		 3301 // If we are generating a shared library, then we can't do anything
3302 // in the linker.
8851ecca 3303 if (parameters->options().shared())
e041f13d 3304 return tls::TLSOPT_NONE;
2e30d253
ILT		 3305
3306 switch (r_type)
3307 {
3308 case elfcpp::R_X86_64_TLSGD:
e041f13d
ILT		 3309 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3310 case elfcpp::R_X86_64_TLSDESC_CALL:
3311 // These are General-Dynamic which permits fully general TLS
2e30d253
ILT		 3312 // access. Since we know that we are generating an executable,
3313 // we can convert this to Initial-Exec. If we also know that
3314 // this is a local symbol, we can further switch to Local-Exec.
3315 if (is_final)
e041f13d
ILT		 3316 return tls::TLSOPT_TO_LE;
3317 return tls::TLSOPT_TO_IE;
2e30d253 3318
d61c17ea 3319 case elfcpp::R_X86_64_TLSLD:
2e30d253
ILT		 3320 // This is Local-Dynamic, which refers to a local symbol in the
3321 // dynamic TLS block. Since we know that we generating an
3322 // executable, we can switch to Local-Exec.
e041f13d 3323 return tls::TLSOPT_TO_LE;
2e30d253 3324
0ffd9845 3325 case elfcpp::R_X86_64_DTPOFF32:
0ffd9845
ILT		 3326 case elfcpp::R_X86_64_DTPOFF64:
3327 // Another Local-Dynamic reloc.
e041f13d 3328 return tls::TLSOPT_TO_LE;
0ffd9845 3329
d61c17ea 3330 case elfcpp::R_X86_64_GOTTPOFF:
2e30d253
ILT		 3331 // These are Initial-Exec relocs which get the thread offset
3332 // from the GOT. If we know that we are linking against the
3333 // local symbol, we can switch to Local-Exec, which links the
3334 // thread offset into the instruction.
3335 if (is_final)
e041f13d
ILT		 3336 return tls::TLSOPT_TO_LE;
3337 return tls::TLSOPT_NONE;
2e30d253 3338
d61c17ea 3339 case elfcpp::R_X86_64_TPOFF32:
2e30d253
ILT		 3340 // When we already have Local-Exec, there is nothing further we
3341 // can do.
e041f13d 3342 return tls::TLSOPT_NONE;
2e30d253
ILT		 3343
3344 default:
3345 gold_unreachable();
3346 }
2e30d253
ILT		 3347}
3348
95a2c8d6
RS		 3349// Get the Reference_flags for a particular relocation.
3350
fc51264f 3351template<int size>
95a2c8d6 3352int
fc51264f 3353Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
95a2c8d6
RS		 3354{
3355 switch (r_type)
3356 {
3357 case elfcpp::R_X86_64_NONE:
3358 case elfcpp::R_X86_64_GNU_VTINHERIT:
3359 case elfcpp::R_X86_64_GNU_VTENTRY:
3360 case elfcpp::R_X86_64_GOTPC32:
3361 case elfcpp::R_X86_64_GOTPC64:
3362 // No symbol reference.
3363 return 0;
3364
3365 case elfcpp::R_X86_64_64:
3366 case elfcpp::R_X86_64_32:
3367 case elfcpp::R_X86_64_32S:
3368 case elfcpp::R_X86_64_16:
3369 case elfcpp::R_X86_64_8:
3370 return Symbol::ABSOLUTE_REF;
3371
3372 case elfcpp::R_X86_64_PC64:
3373 case elfcpp::R_X86_64_PC32:
f49fe902 3374 case elfcpp::R_X86_64_PC32_BND:
95a2c8d6
RS		 3375 case elfcpp::R_X86_64_PC16:
3376 case elfcpp::R_X86_64_PC8:
3377 case elfcpp::R_X86_64_GOTOFF64:
3378 return Symbol::RELATIVE_REF;
3379
3380 case elfcpp::R_X86_64_PLT32:
f49fe902 3381 case elfcpp::R_X86_64_PLT32_BND:
95a2c8d6
RS		 3382 case elfcpp::R_X86_64_PLTOFF64:
3383 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
3384
3385 case elfcpp::R_X86_64_GOT64:
3386 case elfcpp::R_X86_64_GOT32:
3387 case elfcpp::R_X86_64_GOTPCREL64:
3388 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3389 case elfcpp::R_X86_64_GOTPCRELX:
3390 case elfcpp::R_X86_64_REX_GOTPCRELX:
95a2c8d6
RS		 3391 case elfcpp::R_X86_64_GOTPLT64:
3392 // Absolute in GOT.
3393 return Symbol::ABSOLUTE_REF;
3394
3395 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3396 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3397 case elfcpp::R_X86_64_TLSDESC_CALL:
3398 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
3399 case elfcpp::R_X86_64_DTPOFF32:
3400 case elfcpp::R_X86_64_DTPOFF64:
3401 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3402 case elfcpp::R_X86_64_TPOFF32: // Local-exec
3403 return Symbol::TLS_REF;
3404
3405 case elfcpp::R_X86_64_COPY:
3406 case elfcpp::R_X86_64_GLOB_DAT:
3407 case elfcpp::R_X86_64_JUMP_SLOT:
3408 case elfcpp::R_X86_64_RELATIVE:
3409 case elfcpp::R_X86_64_IRELATIVE:
3410 case elfcpp::R_X86_64_TPOFF64:
3411 case elfcpp::R_X86_64_DTPMOD64:
3412 case elfcpp::R_X86_64_TLSDESC:
3413 case elfcpp::R_X86_64_SIZE32:
3414 case elfcpp::R_X86_64_SIZE64:
3415 default:
3416 // Not expected. We will give an error later.
3417 return 0;
3418 }
3419}
3420
e041f13d
ILT		 3421// Report an unsupported relocation against a local symbol.
3422
fc51264f 3423template<int size>
e041f13d 3424void
fc51264f
L		 3425Target_x86_64<size>::Scan::unsupported_reloc_local(
3426 Sized_relobj_file<size, false>* object,
6fa2a40b 3427 unsigned int r_type)
e041f13d 3428{
75f2446e
ILT		 3429 gold_error(_("%s: unsupported reloc %u against local symbol"),
3430 object->name().c_str(), r_type);
e041f13d
ILT		 3431}
3432
a036edd8
ILT		 3433// We are about to emit a dynamic relocation of type R_TYPE. If the
3434// dynamic linker does not support it, issue an error. The GNU linker
3435// only issues a non-PIC error for an allocated read-only section.
3436// Here we know the section is allocated, but we don't know that it is
3437// read-only. But we check for all the relocation types which the
3438// glibc dynamic linker supports, so it seems appropriate to issue an
a29b0dad
ILT		 3439// error even if the section is not read-only. If GSYM is not NULL,
3440// it is the symbol the relocation is against; if it is NULL, the
3441// relocation is against a local symbol.
a036edd8 3442
fc51264f 3443template<int size>
a036edd8 3444void
fc51264f
L		 3445Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
3446 Symbol* gsym)
a036edd8
ILT		 3447{
3448 switch (r_type)
3449 {
2fbb4320
ILT		 3450 // These are the relocation types supported by glibc for x86_64
3451 // which should always work.
a036edd8 3452 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3453 case elfcpp::R_X86_64_IRELATIVE:
a036edd8
ILT		 3454 case elfcpp::R_X86_64_GLOB_DAT:
3455 case elfcpp::R_X86_64_JUMP_SLOT:
3456 case elfcpp::R_X86_64_DTPMOD64:
3457 case elfcpp::R_X86_64_DTPOFF64:
3458 case elfcpp::R_X86_64_TPOFF64:
3459 case elfcpp::R_X86_64_64:
2fbb4320
ILT		 3460 case elfcpp::R_X86_64_COPY:
3461 return;
3462
3463 // glibc supports these reloc types, but they can overflow.
a036edd8 3464 case elfcpp::R_X86_64_PC32:
f49fe902 3465 case elfcpp::R_X86_64_PC32_BND:
a29b0dad
ILT		 3466 // A PC relative reference is OK against a local symbol or if
3467 // the symbol is defined locally.
3468 if (gsym == NULL
3469 || (!gsym->is_from_dynobj()
3470 && !gsym->is_undefined()
3471 && !gsym->is_preemptible()))
3472 return;
d8e90251 3473 // Fall through.
a29b0dad 3474 case elfcpp::R_X86_64_32:
3660ff06
L		 3475 // R_X86_64_32 is OK for x32.
3476 if (size == 32 && r_type == elfcpp::R_X86_64_32)
3477 return;
2fbb4320
ILT		 3478 if (this->issued_non_pic_error_)
3479 return;
3480 gold_assert(parameters->options().output_is_position_independent());
a29b0dad
ILT		 3481 if (gsym == NULL)
3482 object->error(_("requires dynamic R_X86_64_32 reloc which may "
3483 "overflow at runtime; recompile with -fPIC"));
3484 else
f49fe902
L		 3485 {
3486 const char *r_name;
3487 switch (r_type)
3488 {
3489 case elfcpp::R_X86_64_32:
3490 r_name = "R_X86_64_32";
3491 break;
3492 case elfcpp::R_X86_64_PC32:
3493 r_name = "R_X86_64_PC32";
3494 break;
3495 case elfcpp::R_X86_64_PC32_BND:
3496 r_name = "R_X86_64_PC32_BND";
3497 break;
3498 default:
3499 gold_unreachable();
3500 break;
3501 }
3502 object->error(_("requires dynamic %s reloc against '%s' "
3503 "which may overflow at runtime; recompile "
3504 "with -fPIC"),
3505 r_name, gsym->name());
3506 }
2fbb4320 3507 this->issued_non_pic_error_ = true;
a036edd8
ILT		 3508 return;
3509
3510 default:
3511 // This prevents us from issuing more than one error per reloc
3512 // section. But we can still wind up issuing more than one
3513 // error per object file.
3514 if (this->issued_non_pic_error_)
2e702c99 3515 return;
33aea2fd 3516 gold_assert(parameters->options().output_is_position_independent());
a29b0dad 3517 object->error(_("requires unsupported dynamic reloc %u; "
2e702c99 3518 "recompile with -fPIC"),
a29b0dad 3519 r_type);
a036edd8
ILT		 3520 this->issued_non_pic_error_ = true;
3521 return;
3522
3523 case elfcpp::R_X86_64_NONE:
3524 gold_unreachable();
3525 }
3526}
3527
7223e9ca
ILT		 3528// Return whether we need to make a PLT entry for a relocation of the
3529// given type against a STT_GNU_IFUNC symbol.
3530
fc51264f 3531template<int size>
7223e9ca 3532bool
fc51264f
L		 3533Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
3534 Sized_relobj_file<size, false>* object,
6fa2a40b 3535 unsigned int r_type)
7223e9ca 3536{
95a2c8d6
RS		 3537 int flags = Scan::get_reference_flags(r_type);
3538 if (flags & Symbol::TLS_REF)
3539 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2e702c99 3540 object->name().c_str(), r_type);
95a2c8d6 3541 return flags != 0;
7223e9ca
ILT		 3542}
3543
2e30d253
ILT		 3544// Scan a relocation for a local symbol.
3545
fc51264f 3546template<int size>
2e30d253 3547inline void
fc51264f
L		 3548Target_x86_64<size>::Scan::local(Symbol_table* symtab,
3549 Layout* layout,
3550 Target_x86_64<size>* target,
3551 Sized_relobj_file<size, false>* object,
3552 unsigned int data_shndx,
3553 Output_section* output_section,
3554 const elfcpp::Rela<size, false>& reloc,
3555 unsigned int r_type,
bfdfa4cd
AM		 3556 const elfcpp::Sym<size, false>& lsym,
3557 bool is_discarded)
2e30d253 3558{
bfdfa4cd
AM		 3559 if (is_discarded)
3560 return;
3561
7223e9ca 3562 // A local STT_GNU_IFUNC symbol may require a PLT entry.
397b129b
CC		 3563 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
3564 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
7223e9ca 3565 {
fc51264f 3566 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 3567 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
3568 }
3569
2e30d253
ILT		 3570 switch (r_type)
3571 {
3572 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 3573 case elfcpp::R_X86_64_GNU_VTINHERIT:
3574 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 3575 break;
3576
3577 case elfcpp::R_X86_64_64:
d61c6bd4 3578 // If building a shared library (or a position-independent
dceae3c1
ILT		 3579 // executable), we need to create a dynamic relocation for this
3580 // location. The relocation applied at link time will apply the
3581 // link-time value, so we flag the location with an
3582 // R_X86_64_RELATIVE relocation so the dynamic loader can
d61c6bd4 3583 // relocate it easily.
8851ecca 3584 if (parameters->options().output_is_position_independent())
2e702c99
RM		 3585 {
3586 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
3587 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca 3588 rela_dyn->add_local_relative(object, r_sym,
62fe925a 3589 (size == 32
fd885f3a
L		 3590 ? elfcpp::R_X86_64_RELATIVE64
3591 : elfcpp::R_X86_64_RELATIVE),
7223e9ca
ILT		 3592 output_section, data_shndx,
3593 reloc.get_r_offset(),
397b129b 3594 reloc.get_r_addend(), is_ifunc);
2e702c99 3595 }
d61c6bd4
ILT		 3596 break;
3597
2e30d253
ILT		 3598 case elfcpp::R_X86_64_32:
3599 case elfcpp::R_X86_64_32S:
3600 case elfcpp::R_X86_64_16:
3601 case elfcpp::R_X86_64_8:
96f2030e 3602 // If building a shared library (or a position-independent
dceae3c1
ILT		 3603 // executable), we need to create a dynamic relocation for this
3604 // location. We can't use an R_X86_64_RELATIVE relocation
3605 // because that is always a 64-bit relocation.
8851ecca 3606 if (parameters->options().output_is_position_independent())
2e702c99 3607 {
3660ff06
L		 3608 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
3609 if (size == 32 && r_type == elfcpp::R_X86_64_32)
3610 {
3611 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
3612 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
3613 rela_dyn->add_local_relative(object, r_sym,
3614 elfcpp::R_X86_64_RELATIVE,
3615 output_section, data_shndx,
3616 reloc.get_r_offset(),
3617 reloc.get_r_addend(), is_ifunc);
3618 break;
3619 }
3620
2e702c99 3621 this->check_non_pic(object, r_type, NULL);
a036edd8 3622
2e702c99 3623 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
fc51264f 3624 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2e702c99 3625 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 3626 rela_dyn->add_local(object, r_sym, r_type, output_section,
3627 data_shndx, reloc.get_r_offset(),
3628 reloc.get_r_addend());
2e702c99
RM		 3629 else
3630 {
3631 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 3632 unsigned int shndx = lsym.get_st_shndx();
3633 bool is_ordinary;
3634 shndx = object->adjust_sym_shndx(r_sym, shndx,
3635 &is_ordinary);
3636 if (!is_ordinary)
3637 object->error(_("section symbol %u has bad shndx %u"),
3638 r_sym, shndx);
3639 else
3640 rela_dyn->add_local_section(object, shndx,
3641 r_type, output_section,
3642 data_shndx, reloc.get_r_offset(),
3643 reloc.get_r_addend());
2e702c99
RM		 3644 }
3645 }
2e30d253
ILT		 3646 break;
3647
3648 case elfcpp::R_X86_64_PC64:
3649 case elfcpp::R_X86_64_PC32:
f49fe902 3650 case elfcpp::R_X86_64_PC32_BND:
2e30d253
ILT		 3651 case elfcpp::R_X86_64_PC16:
3652 case elfcpp::R_X86_64_PC8:
3653 break;
3654
f389a824 3655 case elfcpp::R_X86_64_PLT32:
f49fe902 3656 case elfcpp::R_X86_64_PLT32_BND:
f389a824
ILT		 3657 // Since we know this is a local symbol, we can handle this as a
3658 // PC32 reloc.
3659 break;
3660
fdc2f80f 3661 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 3662 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 3663 case elfcpp::R_X86_64_GOTPC64:
3664 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 3665 // We need a GOT section.
3666 target->got_section(symtab, layout);
ee9e9e86
ILT		 3667 // For PLTOFF64, we'd normally want a PLT section, but since we
3668 // know this is a local symbol, no PLT is needed.
2e30d253
ILT		 3669 break;
3670
0ffd9845
ILT		 3671 case elfcpp::R_X86_64_GOT64:
3672 case elfcpp::R_X86_64_GOT32:
3673 case elfcpp::R_X86_64_GOTPCREL64:
3674 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3675 case elfcpp::R_X86_64_GOTPCRELX:
3676 case elfcpp::R_X86_64_REX_GOTPCRELX:
ee9e9e86 3677 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845 3678 {
1fa29f10 3679 // The symbol requires a GOT section.
2e702c99 3680 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 3681
3682 // If the relocation symbol isn't IFUNC,
3683 // and is local, then we will convert
3684 // mov foo@GOTPCREL(%rip), %reg
3685 // to lea foo(%rip), %reg.
3686 // in Relocate::relocate.
158600eb
CC		 3687 if (!parameters->incremental()
3688 && (r_type == elfcpp::R_X86_64_GOTPCREL
3689 || r_type == elfcpp::R_X86_64_GOTPCRELX
3690 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
1fa29f10
IT		 3691 && reloc.get_r_offset() >= 2
3692 && !is_ifunc)
3693 {
3694 section_size_type stype;
3695 const unsigned char* view = object->section_contents(data_shndx,
3696 &stype, true);
3697 if (view[reloc.get_r_offset() - 2] == 0x8b)
3698 break;
3699 }
3700
1fa29f10 3701 // The symbol requires a GOT entry.
2e702c99 3702 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 3703
3704 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
3705 // lets function pointers compare correctly with shared
3706 // libraries. Otherwise we would need an IRELATIVE reloc.
3707 bool is_new;
397b129b 3708 if (is_ifunc)
7223e9ca
ILT		 3709 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
3710 else
3711 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2e702c99
RM		 3712 if (is_new)
3713 {
3714 // If we are generating a shared object, we need to add a
3715 // dynamic relocation for this symbol's GOT entry.
3716 if (parameters->options().output_is_position_independent())
3717 {
3718 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7bf1f802
ILT		 3719 // R_X86_64_RELATIVE assumes a 64-bit relocation.
3720 if (r_type != elfcpp::R_X86_64_GOT32)
7223e9ca
ILT		 3721 {
3722 unsigned int got_offset =
3723 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
3724 rela_dyn->add_local_relative(object, r_sym,
3725 elfcpp::R_X86_64_RELATIVE,
397b129b 3726 got, got_offset, 0, is_ifunc);
7223e9ca 3727 }
2e702c99
RM		 3728 else
3729 {
3730 this->check_non_pic(object, r_type, NULL);
3731
3732 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
3733 rela_dyn->add_local(
3734 object, r_sym, r_type, got,
3735 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
3736 }
3737 }
3738 }
3739 // For GOTPLT64, we'd normally want a PLT section, but since
3740 // we know this is a local symbol, no PLT is needed.
0ffd9845
ILT		 3741 }
3742 break;
3743
2e30d253
ILT		 3744 case elfcpp::R_X86_64_COPY:
3745 case elfcpp::R_X86_64_GLOB_DAT:
3746 case elfcpp::R_X86_64_JUMP_SLOT:
3747 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3748 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3749 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 3750 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3751 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 3752 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3753 gold_error(_("%s: unexpected reloc %u in object file"),
3754 object->name().c_str(), r_type);
2e30d253
ILT		 3755 break;
3756
d61c17ea 3757 // These are initial tls relocs, which are expected when linking
56622147
ILT		 3758 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3759 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3760 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3761 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3762 case elfcpp::R_X86_64_DTPOFF32:
3763 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3764 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3765 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 3766 {
8851ecca 3767 bool output_is_shared = parameters->options().shared();
e041f13d 3768 const tls::Tls_optimization optimized_type
2e702c99 3769 = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
fc51264f 3770 r_type);
2e30d253
ILT		 3771 switch (r_type)
3772 {
2e702c99
RM		 3773 case elfcpp::R_X86_64_TLSGD: // General-dynamic
3774 if (optimized_type == tls::TLSOPT_NONE)
3775 {
3776 // Create a pair of GOT entries for the module index and
3777 // dtv-relative offset.
3778 Output_data_got<64, false>* got
3779 = target->got_section(symtab, layout);
3780 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
d491d34e
ILT		 3781 unsigned int shndx = lsym.get_st_shndx();
3782 bool is_ordinary;
3783 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
3784 if (!is_ordinary)
3785 object->error(_("local symbol %u has bad shndx %u"),
3786 r_sym, shndx);
2e702c99 3787 else
83896202
ILT		 3788 got->add_local_pair_with_rel(object, r_sym,
3789 shndx,
3790 GOT_TYPE_TLS_PAIR,
3791 target->rela_dyn_section(layout),
bd73a62d 3792 elfcpp::R_X86_64_DTPMOD64);
2e702c99
RM		 3793 }
3794 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 3795 unsupported_reloc_local(object, r_type);
2e702c99 3796 break;
7bf1f802 3797
2e702c99
RM		 3798 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3799 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 3800 if (optimized_type == tls::TLSOPT_NONE)
3801 {
2e702c99
RM		 3802 // Create reserved PLT and GOT entries for the resolver.
3803 target->reserve_tlsdesc_entries(symtab, layout);
3804
3805 // Generate a double GOT entry with an
3806 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
3807 // is resolved lazily, so the GOT entry needs to be in
3808 // an area in .got.plt, not .got. Call got_section to
3809 // make sure the section has been created.
a8df5856 3810 target->got_section(symtab, layout);
2e702c99
RM		 3811 Output_data_got<64, false>* got = target->got_tlsdesc_section();
3812 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
e291e7b9
ILT		 3813 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
3814 {
3815 unsigned int got_offset = got->add_constant(0);
3816 got->add_constant(0);
3817 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
3818 got_offset);
3819 Reloc_section* rt = target->rela_tlsdesc_section(layout);
3820 // We store the arguments we need in a vector, and
3821 // use the index into the vector as the parameter
3822 // to pass to the target specific routines.
3823 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
3824 void* arg = reinterpret_cast<void*>(intarg);
3825 rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
3826 got, got_offset, 0);
3827 }
c2b45e22
CC		 3828 }
3829 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 3830 unsupported_reloc_local(object, r_type);
2e30d253
ILT		 3831 break;
3832
2e702c99 3833 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 3834 break;
3835
2e702c99 3836 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 3837 if (optimized_type == tls::TLSOPT_NONE)
3838 {
2e702c99
RM		 3839 // Create a GOT entry for the module index.
3840 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 3841 }
3842 else if (optimized_type != tls::TLSOPT_TO_LE)
3843 unsupported_reloc_local(object, r_type);
3844 break;
3845
2e702c99
RM		 3846 case elfcpp::R_X86_64_DTPOFF32:
3847 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 3848 break;
3849
2e702c99 3850 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 3851 layout->set_has_static_tls();
2e702c99
RM		 3852 if (optimized_type == tls::TLSOPT_NONE)
3853 {
3854 // Create a GOT entry for the tp-relative offset.
3855 Output_data_got<64, false>* got
3856 = target->got_section(symtab, layout);
3857 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
3858 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3859 target->rela_dyn_section(layout),
3860 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 3861 }
3862 else if (optimized_type != tls::TLSOPT_TO_LE)
3863 unsupported_reloc_local(object, r_type);
3864 break;
0ffd9845 3865
2e702c99 3866 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 3867 layout->set_has_static_tls();
2e702c99
RM		 3868 if (output_is_shared)
3869 unsupported_reloc_local(object, r_type);
2e30d253 3870 break;
e041f13d 3871
2e702c99
RM		 3872 default:
3873 gold_unreachable();
2e30d253
ILT		 3874 }
3875 }
3876 break;
2e30d253 3877
fdc2f80f
ILT		 3878 case elfcpp::R_X86_64_SIZE32:
3879 case elfcpp::R_X86_64_SIZE64:
2e30d253 3880 default:
75f2446e
ILT		 3881 gold_error(_("%s: unsupported reloc %u against local symbol"),
3882 object->name().c_str(), r_type);
2e30d253
ILT		 3883 break;
3884 }
3885}
3886
3887
e041f13d
ILT		 3888// Report an unsupported relocation against a global symbol.
3889
fc51264f 3890template<int size>
e041f13d 3891void
fc51264f
L		 3892Target_x86_64<size>::Scan::unsupported_reloc_global(
3893 Sized_relobj_file<size, false>* object,
6fa2a40b
CC		 3894 unsigned int r_type,
3895 Symbol* gsym)
e041f13d 3896{
75f2446e 3897 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 3898 object->name().c_str(), r_type, gsym->demangled_name().c_str());
e041f13d
ILT		 3899}
3900
ce97fa81 3901// Returns true if this relocation type could be that of a function pointer.
fc51264f 3902template<int size>
21bb3914 3903inline bool
4aebb631
RC		 3904Target_x86_64<size>::Scan::possible_function_pointer_reloc(
3905 Sized_relobj_file<size, false>* src_obj,
3906 unsigned int src_indx,
3907 unsigned int r_offset,
3908 unsigned int r_type)
21bb3914 3909{
21bb3914
ST		 3910 switch (r_type)
3911 {
3912 case elfcpp::R_X86_64_64:
3913 case elfcpp::R_X86_64_32:
3914 case elfcpp::R_X86_64_32S:
3915 case elfcpp::R_X86_64_16:
3916 case elfcpp::R_X86_64_8:
ce97fa81
ST		 3917 case elfcpp::R_X86_64_GOT64:
3918 case elfcpp::R_X86_64_GOT32:
3919 case elfcpp::R_X86_64_GOTPCREL64:
3920 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3921 case elfcpp::R_X86_64_GOTPCRELX:
3922 case elfcpp::R_X86_64_REX_GOTPCRELX:
ce97fa81 3923 case elfcpp::R_X86_64_GOTPLT64:
21bb3914 3924 {
2e702c99 3925 return true;
21bb3914 3926 }
4aebb631
RC		 3927 case elfcpp::R_X86_64_PC32:
3928 {
3929 // This relocation may be used both for function calls and
3930 // for taking address of a function. We distinguish between
3931 // them by checking the opcodes.
3932 uint64_t sh_flags = src_obj->section_flags(src_indx);
3933 bool is_executable = (sh_flags & elfcpp::SHF_EXECINSTR) != 0;
3934 if (is_executable)
3935 {
3936 section_size_type stype;
3937 const unsigned char* view = src_obj->section_contents(src_indx,
3938 &stype,
3939 true);
3940
3941 // call
3942 if (r_offset >= 1
3943 && view[r_offset - 1] == 0xe8)
3944 return false;
3945
3946 // jmp
3947 if (r_offset >= 1
3948 && view[r_offset - 1] == 0xe9)
3949 return false;
3950
3951 // jo/jno/jb/jnb/je/jne/jna/ja/js/jns/jp/jnp/jl/jge/jle/jg
3952 if (r_offset >= 2
3953 && view[r_offset - 2] == 0x0f
3954 && view[r_offset - 1] >= 0x80
3955 && view[r_offset - 1] <= 0x8f)
3956 return false;
3957 }
3958
3959 // Be conservative and treat all others as function pointers.
3960 return true;
3961 }
21bb3914
ST		 3962 }
3963 return false;
3964}
3965
3966// For safe ICF, scan a relocation for a local symbol to check if it
3967// corresponds to a function pointer being taken. In that case mark
3968// the function whose pointer was taken as not foldable.
3969
fc51264f 3970template<int size>
21bb3914 3971inline bool
fc51264f 3972Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
21bb3914
ST		 3973 Symbol_table* ,
3974 Layout* ,
fc51264f 3975 Target_x86_64<size>* ,
4aebb631
RC		 3976 Sized_relobj_file<size, false>* src_obj,
3977 unsigned int src_indx,
21bb3914 3978 Output_section* ,
4aebb631 3979 const elfcpp::Rela<size, false>& reloc,
21bb3914 3980 unsigned int r_type,
fc51264f 3981 const elfcpp::Sym<size, false>&)
21bb3914
ST		 3982{
3983 // When building a shared library, do not fold any local symbols as it is
3984 // not possible to distinguish pointer taken versus a call by looking at
3985 // the relocation types.
4aebb631
RC		 3986 if (parameters->options().shared())
3987 return true;
3988
3989 return possible_function_pointer_reloc(src_obj, src_indx,
3990 reloc.get_r_offset(), r_type);
21bb3914
ST		 3991}
3992
3993// For safe ICF, scan a relocation for a global symbol to check if it
3994// corresponds to a function pointer being taken. In that case mark
3995// the function whose pointer was taken as not foldable.
3996
fc51264f 3997template<int size>
21bb3914 3998inline bool
fc51264f 3999Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
21bb3914
ST		 4000 Symbol_table*,
4001 Layout* ,
fc51264f 4002 Target_x86_64<size>* ,
4aebb631
RC		 4003 Sized_relobj_file<size, false>* src_obj,
4004 unsigned int src_indx,
21bb3914 4005 Output_section* ,
4aebb631 4006 const elfcpp::Rela<size, false>& reloc,
21bb3914
ST		 4007 unsigned int r_type,
4008 Symbol* gsym)
4009{
4010 // When building a shared library, do not fold symbols whose visibility
4011 // is hidden, internal or protected.
4aebb631
RC		 4012 if (parameters->options().shared()
4013 && (gsym->visibility() == elfcpp::STV_INTERNAL
4014 || gsym->visibility() == elfcpp::STV_PROTECTED
4015 || gsym->visibility() == elfcpp::STV_HIDDEN))
4016 return true;
4017
4018 return possible_function_pointer_reloc(src_obj, src_indx,
4019 reloc.get_r_offset(), r_type);
21bb3914
ST		 4020}
4021
2e30d253
ILT		 4022// Scan a relocation for a global symbol.
4023
fc51264f 4024template<int size>
2e30d253 4025inline void
fc51264f 4026Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2e702c99
RM		 4027 Layout* layout,
4028 Target_x86_64<size>* target,
4029 Sized_relobj_file<size, false>* object,
4030 unsigned int data_shndx,
4031 Output_section* output_section,
4032 const elfcpp::Rela<size, false>& reloc,
4033 unsigned int r_type,
4034 Symbol* gsym)
2e30d253 4035{
7223e9ca
ILT		 4036 // A STT_GNU_IFUNC symbol may require a PLT entry.
4037 if (gsym->type() == elfcpp::STT_GNU_IFUNC
4038 && this->reloc_needs_plt_for_ifunc(object, r_type))
4039 target->make_plt_entry(symtab, layout, gsym);
4040
2e30d253
ILT		 4041 switch (r_type)
4042 {
4043 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 4044 case elfcpp::R_X86_64_GNU_VTINHERIT:
4045 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 4046 break;
4047
4048 case elfcpp::R_X86_64_64:
2e30d253
ILT		 4049 case elfcpp::R_X86_64_32:
4050 case elfcpp::R_X86_64_32S:
2e30d253 4051 case elfcpp::R_X86_64_16:
2e30d253 4052 case elfcpp::R_X86_64_8:
96f2030e 4053 {
2e702c99
RM		 4054 // Make a PLT entry if necessary.
4055 if (gsym->needs_plt_entry())
4056 {
4057 target->make_plt_entry(symtab, layout, gsym);
4058 // Since this is not a PC-relative relocation, we may be
4059 // taking the address of a function. In that case we need to
4060 // set the entry in the dynamic symbol table to the address of
4061 // the PLT entry.
4062 if (gsym->is_from_dynobj() && !parameters->options().shared())
4063 gsym->set_needs_dynsym_value();
4064 }
4065 // Make a dynamic relocation if necessary.
4066 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
4067 {
a82bef93
ST		 4068 if (!parameters->options().output_is_position_independent()
4069 && gsym->may_need_copy_reloc())
2e702c99
RM		 4070 {
4071 target->copy_reloc(symtab, layout, object,
4072 data_shndx, output_section, gsym, reloc);
4073 }
1bae613c
L		 4074 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
4075 || (size == 32 && r_type == elfcpp::R_X86_64_32))
7223e9ca
ILT		 4076 && gsym->type() == elfcpp::STT_GNU_IFUNC
4077 && gsym->can_use_relative_reloc(false)
4078 && !gsym->is_from_dynobj()
4079 && !gsym->is_undefined()
4080 && !gsym->is_preemptible())
4081 {
4082 // Use an IRELATIVE reloc for a locally defined
4083 // STT_GNU_IFUNC symbol. This makes a function
4084 // address in a PIE executable match the address in a
4085 // shared library that it links against.
67181c72
ILT		 4086 Reloc_section* rela_dyn =
4087 target->rela_irelative_section(layout);
7223e9ca
ILT		 4088 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
4089 rela_dyn->add_symbolless_global_addend(gsym, r_type,
4090 output_section, object,
4091 data_shndx,
4092 reloc.get_r_offset(),
4093 reloc.get_r_addend());
4094 }
b14016f0
L		 4095 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
4096 || (size == 32 && r_type == elfcpp::R_X86_64_32))
2e702c99
RM		 4097 && gsym->can_use_relative_reloc(false))
4098 {
4099 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca
ILT		 4100 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
4101 output_section, object,
4102 data_shndx,
4103 reloc.get_r_offset(),
13cf9988 4104 reloc.get_r_addend(), false);
2e702c99
RM		 4105 }
4106 else
4107 {
4108 this->check_non_pic(object, r_type, gsym);
4109 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
4110 rela_dyn->add_global(gsym, r_type, output_section, object,
4111 data_shndx, reloc.get_r_offset(),
4112 reloc.get_r_addend());
4113 }
4114 }
d61c6bd4
ILT		 4115 }
4116 break;
4117
4118 case elfcpp::R_X86_64_PC64:
4119 case elfcpp::R_X86_64_PC32:
f49fe902 4120 case elfcpp::R_X86_64_PC32_BND:
d61c6bd4
ILT		 4121 case elfcpp::R_X86_64_PC16:
4122 case elfcpp::R_X86_64_PC8:
4123 {
2e702c99
RM		 4124 // Make a PLT entry if necessary.
4125 if (gsym->needs_plt_entry())
4126 target->make_plt_entry(symtab, layout, gsym);
4127 // Make a dynamic relocation if necessary.
4128 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
4129 {
a82bef93
ST		 4130 if (parameters->options().output_is_executable()
4131 && gsym->may_need_copy_reloc())
2e702c99
RM		 4132 {
4133 target->copy_reloc(symtab, layout, object,
4134 data_shndx, output_section, gsym, reloc);
4135 }
4136 else
4137 {
4138 this->check_non_pic(object, r_type, gsym);
4139 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
4140 rela_dyn->add_global(gsym, r_type, output_section, object,
4141 data_shndx, reloc.get_r_offset(),
4142 reloc.get_r_addend());
4143 }
4144 }
d61c6bd4 4145 }
2e30d253
ILT		 4146 break;
4147
ff006520 4148 case elfcpp::R_X86_64_GOT64:
2e30d253 4149 case elfcpp::R_X86_64_GOT32:
ff006520
ILT		 4150 case elfcpp::R_X86_64_GOTPCREL64:
4151 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 4152 case elfcpp::R_X86_64_GOTPCRELX:
4153 case elfcpp::R_X86_64_REX_GOTPCRELX:
ff006520 4154 case elfcpp::R_X86_64_GOTPLT64:
2e30d253 4155 {
2e702c99
RM		 4156 // The symbol requires a GOT entry.
4157 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 4158
4159 // If we convert this from
4160 // mov foo@GOTPCREL(%rip), %reg
4161 // to lea foo(%rip), %reg.
3a4f096e
ST		 4162 // OR
4163 // if we convert
4164 // (callq|jmpq) *foo@GOTPCRELX(%rip) to
4165 // (callq|jmpq) foo
1fa29f10 4166 // in Relocate::relocate, then there is nothing to do here.
158600eb
CC		 4167 // We cannot make these optimizations in incremental linking mode,
4168 // because we look at the opcode to decide whether or not to make
4169 // change, and during an incremental update, the change may have
4170 // already been applied.
3a4f096e
ST		 4171
4172 Lazy_view<size> view(object, data_shndx);
4173 size_t r_offset = reloc.get_r_offset();
158600eb
CC		 4174 if (!parameters->incremental()
4175 && r_offset >= 2
3a4f096e
ST		 4176 && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
4177 r_offset, &view))
4178 break;
4179
158600eb
CC		 4180 if (!parameters->incremental()
4181 && r_offset >= 2
3a4f096e
ST		 4182 && Target_x86_64<size>::can_convert_callq_to_direct(gsym, r_type,
4183 r_offset,
4184 &view))
4185 break;
1fa29f10 4186
2e702c99 4187 if (gsym->final_value_is_known())
7223e9ca
ILT		 4188 {
4189 // For a STT_GNU_IFUNC symbol we want the PLT address.
4190 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
4191 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
4192 else
4193 got->add_global(gsym, GOT_TYPE_STANDARD);
4194 }
2e702c99
RM		 4195 else
4196 {
4197 // If this symbol is not fully resolved, we need to add a
4198 // dynamic relocation for it.
4199 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
07aa62f2
ILT		 4200
4201 // Use a GLOB_DAT rather than a RELATIVE reloc if:
4202 //
4203 // 1) The symbol may be defined in some other module.
4204 //
4205 // 2) We are building a shared library and this is a
4206 // protected symbol; using GLOB_DAT means that the dynamic
4207 // linker can use the address of the PLT in the main
4208 // executable when appropriate so that function address
4209 // comparisons work.
4210 //
4211 // 3) This is a STT_GNU_IFUNC symbol in position dependent
4212 // code, again so that function address comparisons work.
7223e9ca
ILT		 4213 if (gsym->is_from_dynobj()
4214 || gsym->is_undefined()
4215 || gsym->is_preemptible()
07aa62f2
ILT		 4216 || (gsym->visibility() == elfcpp::STV_PROTECTED
4217 && parameters->options().shared())
7223e9ca
ILT		 4218 || (gsym->type() == elfcpp::STT_GNU_IFUNC
4219 && parameters->options().output_is_position_independent()))
2e702c99 4220 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
83896202 4221 elfcpp::R_X86_64_GLOB_DAT);
2e702c99
RM		 4222 else
4223 {
7223e9ca
ILT		 4224 // For a STT_GNU_IFUNC symbol we want to write the PLT
4225 // offset into the GOT, so that function pointer
4226 // comparisons work correctly.
4227 bool is_new;
4228 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
4229 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
4230 else
4231 {
4232 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
4233 // Tell the dynamic linker to use the PLT address
4234 // when resolving relocations.
4235 if (gsym->is_from_dynobj()
4236 && !parameters->options().shared())
4237 gsym->set_needs_dynsym_value();
4238 }
2e702c99 4239 if (is_new)
7223e9ca
ILT		 4240 {
4241 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
4242 rela_dyn->add_global_relative(gsym,
4243 elfcpp::R_X86_64_RELATIVE,
13cf9988 4244 got, got_off, 0, false);
7223e9ca 4245 }
2e702c99
RM		 4246 }
4247 }
2e30d253
ILT		 4248 }
4249 break;
4250
4251 case elfcpp::R_X86_64_PLT32:
f49fe902 4252 case elfcpp::R_X86_64_PLT32_BND:
2e30d253
ILT		 4253 // If the symbol is fully resolved, this is just a PC32 reloc.
4254 // Otherwise we need a PLT entry.
4255 if (gsym->final_value_is_known())
4256 break;
96f2030e
ILT		 4257 // If building a shared library, we can also skip the PLT entry
4258 // if the symbol is defined in the output file and is protected
4259 // or hidden.
4260 if (gsym->is_defined()
2e702c99
RM		 4261 && !gsym->is_from_dynobj()
4262 && !gsym->is_preemptible())
96f2030e 4263 break;
2e30d253
ILT		 4264 target->make_plt_entry(symtab, layout, gsym);
4265 break;
4266
fdc2f80f 4267 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 4268 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 4269 case elfcpp::R_X86_64_GOTPC64:
4270 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 4271 // We need a GOT section.
4272 target->got_section(symtab, layout);
ee9e9e86
ILT		 4273 // For PLTOFF64, we also need a PLT entry (but only if the
4274 // symbol is not fully resolved).
4275 if (r_type == elfcpp::R_X86_64_PLTOFF64
4276 && !gsym->final_value_is_known())
4277 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 4278 break;
4279
2e30d253
ILT		 4280 case elfcpp::R_X86_64_COPY:
4281 case elfcpp::R_X86_64_GLOB_DAT:
4282 case elfcpp::R_X86_64_JUMP_SLOT:
4283 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 4284 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 4285 // These are outstanding tls relocs, which are unexpected when linking
e822f2b1 4286 case elfcpp::R_X86_64_TPOFF64:
2e30d253 4287 case elfcpp::R_X86_64_DTPMOD64:
e822f2b1 4288 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 4289 gold_error(_("%s: unexpected reloc %u in object file"),
4290 object->name().c_str(), r_type);
2e30d253 4291 break;
2e30d253 4292
d61c17ea 4293 // These are initial tls relocs, which are expected for global()
56622147
ILT		 4294 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
4295 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 4296 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 4297 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 4298 case elfcpp::R_X86_64_DTPOFF32:
4299 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 4300 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
4301 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 4302 {
65d92137
CC		 4303 // For the Initial-Exec model, we can treat undef symbols as final
4304 // when building an executable.
4305 const bool is_final = (gsym->final_value_is_known() ||
4306 (r_type == elfcpp::R_X86_64_GOTTPOFF &&
4307 gsym->is_undefined() &&
4308 parameters->options().output_is_executable()));
e041f13d 4309 const tls::Tls_optimization optimized_type
2e702c99 4310 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 4311 switch (r_type)
4312 {
2e702c99 4313 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 4314 if (optimized_type == tls::TLSOPT_NONE)
4315 {
2e702c99
RM		 4316 // Create a pair of GOT entries for the module index and
4317 // dtv-relative offset.
4318 Output_data_got<64, false>* got
4319 = target->got_section(symtab, layout);
4320 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
83896202
ILT		 4321 target->rela_dyn_section(layout),
4322 elfcpp::R_X86_64_DTPMOD64,
4323 elfcpp::R_X86_64_DTPOFF64);
7bf1f802
ILT		 4324 }
4325 else if (optimized_type == tls::TLSOPT_TO_IE)
4326 {
2e702c99
RM		 4327 // Create a GOT entry for the tp-relative offset.
4328 Output_data_got<64, false>* got
4329 = target->got_section(symtab, layout);
4330 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 4331 target->rela_dyn_section(layout),
4332 elfcpp::R_X86_64_TPOFF64);
7bf1f802
ILT		 4333 }
4334 else if (optimized_type != tls::TLSOPT_TO_LE)
4335 unsupported_reloc_global(object, r_type, gsym);
4336 break;
4337
2e702c99
RM		 4338 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
4339 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 4340 if (optimized_type == tls::TLSOPT_NONE)
4341 {
2e702c99
RM		 4342 // Create reserved PLT and GOT entries for the resolver.
4343 target->reserve_tlsdesc_entries(symtab, layout);
4344
4345 // Create a double GOT entry with an R_X86_64_TLSDESC
4346 // reloc. The R_X86_64_TLSDESC reloc is resolved
4347 // lazily, so the GOT entry needs to be in an area in
4348 // .got.plt, not .got. Call got_section to make sure
4349 // the section has been created.
a8df5856 4350 target->got_section(symtab, layout);
2e702c99 4351 Output_data_got<64, false>* got = target->got_tlsdesc_section();
ca09d69a 4352 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2e702c99 4353 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
83896202 4354 elfcpp::R_X86_64_TLSDESC, 0);
c2b45e22
CC		 4355 }
4356 else if (optimized_type == tls::TLSOPT_TO_IE)
4357 {
2e702c99
RM		 4358 // Create a GOT entry for the tp-relative offset.
4359 Output_data_got<64, false>* got
4360 = target->got_section(symtab, layout);
4361 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 4362 target->rela_dyn_section(layout),
4363 elfcpp::R_X86_64_TPOFF64);
c2b45e22
CC		 4364 }
4365 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 4366 unsupported_reloc_global(object, r_type, gsym);
2e30d253
ILT		 4367 break;
4368
2e702c99 4369 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 4370 break;
4371
2e702c99 4372 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 4373 if (optimized_type == tls::TLSOPT_NONE)
4374 {
2e702c99
RM		 4375 // Create a GOT entry for the module index.
4376 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 4377 }
4378 else if (optimized_type != tls::TLSOPT_TO_LE)
4379 unsupported_reloc_global(object, r_type, gsym);
4380 break;
4381
2e702c99
RM		 4382 case elfcpp::R_X86_64_DTPOFF32:
4383 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 4384 break;
4385
2e702c99 4386 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 4387 layout->set_has_static_tls();
2e702c99
RM		 4388 if (optimized_type == tls::TLSOPT_NONE)
4389 {
4390 // Create a GOT entry for the tp-relative offset.
4391 Output_data_got<64, false>* got
4392 = target->got_section(symtab, layout);
4393 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 4394 target->rela_dyn_section(layout),
4395 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 4396 }
4397 else if (optimized_type != tls::TLSOPT_TO_LE)
4398 unsupported_reloc_global(object, r_type, gsym);
4399 break;
0ffd9845 4400
2e702c99 4401 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 4402 layout->set_has_static_tls();
2e702c99 4403 if (parameters->options().shared())
b1759dce 4404 unsupported_reloc_global(object, r_type, gsym);
2e30d253 4405 break;
e041f13d 4406
2e702c99
RM		 4407 default:
4408 gold_unreachable();
2e30d253
ILT		 4409 }
4410 }
4411 break;
fdc2f80f
ILT		 4412
4413 case elfcpp::R_X86_64_SIZE32:
4414 case elfcpp::R_X86_64_SIZE64:
2e30d253 4415 default:
75f2446e 4416 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 4417 object->name().c_str(), r_type,
2e702c99 4418 gsym->demangled_name().c_str());
2e30d253
ILT		 4419 break;
4420 }
4421}
4422
fc51264f 4423template<int size>
6d03d481 4424void
fc51264f
L		 4425Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
4426 Layout* layout,
4427 Sized_relobj_file<size, false>* object,
4428 unsigned int data_shndx,
4429 unsigned int sh_type,
4430 const unsigned char* prelocs,
4431 size_t reloc_count,
4432 Output_section* output_section,
4433 bool needs_special_offset_handling,
4434 size_t local_symbol_count,
4435 const unsigned char* plocal_symbols)
6d03d481 4436{
4d625b70
CC		 4437 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4438 Classify_reloc;
6d03d481
ST		 4439
4440 if (sh_type == elfcpp::SHT_REL)
4441 {
4442 return;
4443 }
4444
4d625b70
CC		 4445 gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan,
4446 Classify_reloc>(
6d03d481
ST		 4447 symtab,
4448 layout,
4449 this,
4450 object,
4451 data_shndx,
4452 prelocs,
4453 reloc_count,
4454 output_section,
4455 needs_special_offset_handling,
4456 local_symbol_count,
4457 plocal_symbols);
2e702c99 4458
6d03d481 4459}
2e30d253
ILT		 4460// Scan relocations for a section.
4461
fc51264f 4462template<int size>
2e30d253 4463void
fc51264f
L		 4464Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
4465 Layout* layout,
4466 Sized_relobj_file<size, false>* object,
4467 unsigned int data_shndx,
4468 unsigned int sh_type,
4469 const unsigned char* prelocs,
4470 size_t reloc_count,
4471 Output_section* output_section,
4472 bool needs_special_offset_handling,
4473 size_t local_symbol_count,
4474 const unsigned char* plocal_symbols)
2e30d253 4475{
4d625b70
CC		 4476 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4477 Classify_reloc;
4478
2e30d253
ILT		 4479 if (sh_type == elfcpp::SHT_REL)
4480 {
75f2446e
ILT		 4481 gold_error(_("%s: unsupported REL reloc section"),
4482 object->name().c_str());
4483 return;
2e30d253
ILT		 4484 }
4485
4d625b70 4486 gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>(
2e30d253
ILT		 4487 symtab,
4488 layout,
4489 this,
4490 object,
4491 data_shndx,
4492 prelocs,
4493 reloc_count,
730cdc88
ILT		 4494 output_section,
4495 needs_special_offset_handling,
2e30d253 4496 local_symbol_count,
730cdc88 4497 plocal_symbols);
2e30d253
ILT		 4498}
4499
4500// Finalize the sections.
4501
fc51264f 4502template<int size>
2e30d253 4503void
fc51264f 4504Target_x86_64<size>::do_finalize_sections(
f59f41f3
DK		 4505 Layout* layout,
4506 const Input_objects*,
e785ec03 4507 Symbol_table* symtab)
2e30d253 4508{
ea715a34
ILT		 4509 const Reloc_section* rel_plt = (this->plt_ == NULL
4510 ? NULL
e291e7b9 4511 : this->plt_->rela_plt());
ea715a34 4512 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
612a8d3d 4513 this->rela_dyn_, true, false);
2e702c99 4514
2e30d253
ILT		 4515 // Fill in some more dynamic tags.
4516 Output_data_dynamic* const odyn = layout->dynamic_data();
4517 if (odyn != NULL)
4518 {
22b127cc 4519 if (this->plt_ != NULL
ea715a34
ILT		 4520 && this->plt_->output_section() != NULL
4521 && this->plt_->has_tlsdesc_entry())
2e30d253 4522 {
ea715a34
ILT		 4523 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
4524 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
4525 this->got_->finalize_data_size();
4526 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
4527 this->plt_, plt_offset);
4528 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
4529 this->got_, got_offset);
2e30d253
ILT		 4530 }
4531 }
4532
4533 // Emit any relocs we saved in an attempt to avoid generating COPY
4534 // relocs.
12c0daef
ILT		 4535 if (this->copy_relocs_.any_saved_relocs())
4536 this->copy_relocs_.emit(this->rela_dyn_section(layout));
e785ec03
ILT		 4537
4538 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
4539 // the .got.plt section.
4540 Symbol* sym = this->global_offset_table_;
4541 if (sym != NULL)
4542 {
4543 uint64_t data_size = this->got_plt_->current_data_size();
fc51264f 4544 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
e785ec03 4545 }
28a13fec 4546
67181c72
ILT		 4547 if (parameters->doing_static_link()
4548 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
28a13fec
ILT		 4549 {
4550 // If linking statically, make sure that the __rela_iplt symbols
4551 // were defined if necessary, even if we didn't create a PLT.
4552 static const Define_symbol_in_segment syms[] =
4553 {
4554 {
4555 "__rela_iplt_start", // name
4556 elfcpp::PT_LOAD, // segment_type
4557 elfcpp::PF_W, // segment_flags_set
4558 elfcpp::PF(0), // segment_flags_clear
4559 0, // value
4560 0, // size
4561 elfcpp::STT_NOTYPE, // type
4562 elfcpp::STB_GLOBAL, // binding
4563 elfcpp::STV_HIDDEN, // visibility
4564 0, // nonvis
4565 Symbol::SEGMENT_START, // offset_from_base
4566 true // only_if_ref
4567 },
4568 {
4569 "__rela_iplt_end", // name
4570 elfcpp::PT_LOAD, // segment_type
4571 elfcpp::PF_W, // segment_flags_set
4572 elfcpp::PF(0), // segment_flags_clear
4573 0, // value
4574 0, // size
4575 elfcpp::STT_NOTYPE, // type
4576 elfcpp::STB_GLOBAL, // binding
4577 elfcpp::STV_HIDDEN, // visibility
4578 0, // nonvis
4579 Symbol::SEGMENT_START, // offset_from_base
4580 true // only_if_ref
4581 }
4582 };
4583
4584 symtab->define_symbols(layout, 2, syms,
4585 layout->script_options()->saw_sections_clause());
4586 }
2e30d253
ILT		 4587}
4588
19ef3f4d
CC		 4589// For x32, we need to handle PC-relative relocations using full 64-bit
4590// arithmetic, so that we can detect relocation overflows properly.
4591// This class overrides the pcrela32_check methods from the defaults in
4592// Relocate_functions in reloc.h.
4593
4594template<int size>
4595class X86_64_relocate_functions : public Relocate_functions<size, false>
4596{
4597 public:
4598 typedef Relocate_functions<size, false> Base;
4599
4600 // Do a simple PC relative relocation with the addend in the
4601 // relocation.
4602 static inline typename Base::Reloc_status
4603 pcrela32_check(unsigned char* view,
4604 typename elfcpp::Elf_types<64>::Elf_Addr value,
4605 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
4606 typename elfcpp::Elf_types<64>::Elf_Addr address)
4607 {
4608 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
4609 Valtype* wv = reinterpret_cast<Valtype*>(view);
4610 value = value + addend - address;
4611 elfcpp::Swap<32, false>::writeval(wv, value);
4612 return (Bits<32>::has_overflow(value)
4613 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
4614 }
4615
4616 // Do a simple PC relative relocation with a Symbol_value with the
4617 // addend in the relocation.
4618 static inline typename Base::Reloc_status
4619 pcrela32_check(unsigned char* view,
4620 const Sized_relobj_file<size, false>* object,
4621 const Symbol_value<size>* psymval,
4622 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
4623 typename elfcpp::Elf_types<64>::Elf_Addr address)
4624 {
4625 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
4626 Valtype* wv = reinterpret_cast<Valtype*>(view);
7c8b700c
CC		 4627 typename elfcpp::Elf_types<64>::Elf_Addr value;
4628 if (addend >= 0)
4629 value = psymval->value(object, addend);
4630 else
4631 {
4632 // For negative addends, get the symbol value without
4633 // the addend, then add the addend using 64-bit arithmetic.
4634 value = psymval->value(object, 0);
4635 value += addend;
4636 }
4637 value -= address;
19ef3f4d
CC		 4638 elfcpp::Swap<32, false>::writeval(wv, value);
4639 return (Bits<32>::has_overflow(value)
4640 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
4641 }
4642};
4643
2e30d253
ILT		 4644// Perform a relocation.
4645
fc51264f 4646template<int size>
2e30d253 4647inline bool
fc51264f
L		 4648Target_x86_64<size>::Relocate::relocate(
4649 const Relocate_info<size, false>* relinfo,
91a65d2f 4650 unsigned int,
fc51264f
L		 4651 Target_x86_64<size>* target,
4652 Output_section*,
4653 size_t relnum,
91a65d2f 4654 const unsigned char* preloc,
fc51264f
L		 4655 const Sized_symbol<size>* gsym,
4656 const Symbol_value<size>* psymval,
4657 unsigned char* view,
4658 typename elfcpp::Elf_types<size>::Elf_Addr address,
4659 section_size_type view_size)
2e30d253 4660{
19ef3f4d 4661 typedef X86_64_relocate_functions<size> Reloc_funcs;
91a65d2f
AM		 4662 const elfcpp::Rela<size, false> rela(preloc);
4663 unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
4664
2e30d253
ILT		 4665 if (this->skip_call_tls_get_addr_)
4666 {
5efc7cd2 4667 if ((r_type != elfcpp::R_X86_64_PLT32
f5713901 4668 && r_type != elfcpp::R_X86_64_GOTPCREL
ad961eab 4669 && r_type != elfcpp::R_X86_64_GOTPCRELX
f49fe902
L		 4670 && r_type != elfcpp::R_X86_64_PLT32_BND
4671 && r_type != elfcpp::R_X86_64_PC32_BND
2e702c99 4672 && r_type != elfcpp::R_X86_64_PC32)
2e30d253 4673 || gsym == NULL
0ffd9845 4674 || strcmp(gsym->name(), "__tls_get_addr") != 0)
2e30d253 4675 {
75f2446e
ILT		 4676 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4677 _("missing expected TLS relocation"));
f5713901 4678 this->skip_call_tls_get_addr_ = false;
75f2446e
ILT		 4679 }
4680 else
4681 {
4682 this->skip_call_tls_get_addr_ = false;
4683 return false;
2e30d253 4684 }
2e30d253
ILT		 4685 }
4686
0e804863
ILT		 4687 if (view == NULL)
4688 return true;
4689
fc51264f 4690 const Sized_relobj_file<size, false>* object = relinfo->object;
7223e9ca
ILT		 4691
4692 // Pick the value to use for symbols defined in the PLT.
fc51264f 4693 Symbol_value<size> symval;
96f2030e 4694 if (gsym != NULL
95a2c8d6 4695 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
2e30d253 4696 {
19fec8c1 4697 symval.set_output_value(target->plt_address_for_global(gsym));
2e30d253
ILT		 4698 psymval = &symval;
4699 }
7223e9ca
ILT		 4700 else if (gsym == NULL && psymval->is_ifunc_symbol())
4701 {
fc51264f 4702 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7223e9ca
ILT		 4703 if (object->local_has_plt_offset(r_sym))
4704 {
19fec8c1 4705 symval.set_output_value(target->plt_address_for_local(object, r_sym));
7223e9ca
ILT		 4706 psymval = &symval;
4707 }
4708 }
2e30d253 4709
0ffd9845
ILT		 4710 const elfcpp::Elf_Xword addend = rela.get_r_addend();
4711
4712 // Get the GOT offset if needed.
96f2030e
ILT		 4713 // The GOT pointer points to the end of the GOT section.
4714 // We need to subtract the size of the GOT section to get
4715 // the actual offset to use in the relocation.
0ffd9845 4716 bool have_got_offset = false;
c23dd342
L		 4717 // Since the actual offset is always negative, we use signed int to
4718 // support 64-bit GOT relocations.
4719 int got_offset = 0;
0ffd9845
ILT		 4720 switch (r_type)
4721 {
4722 case elfcpp::R_X86_64_GOT32:
4723 case elfcpp::R_X86_64_GOT64:
4724 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845
ILT		 4725 case elfcpp::R_X86_64_GOTPCREL64:
4726 if (gsym != NULL)
2e702c99
RM		 4727 {
4728 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
4729 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
4730 }
0ffd9845 4731 else
2e702c99
RM		 4732 {
4733 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
4734 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
4735 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
4736 - target->got_size());
4737 }
0ffd9845
ILT		 4738 have_got_offset = true;
4739 break;
4740
4741 default:
4742 break;
4743 }
2e30d253 4744
c34c98ed
CC		 4745 typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK;
4746
2e30d253
ILT		 4747 switch (r_type)
4748 {
4749 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 4750 case elfcpp::R_X86_64_GNU_VTINHERIT:
4751 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 4752 break;
4753
4754 case elfcpp::R_X86_64_64:
c34c98ed 4755 Reloc_funcs::rela64(view, object, psymval, addend);
2e30d253
ILT		 4756 break;
4757
4758 case elfcpp::R_X86_64_PC64:
c34c98ed 4759 Reloc_funcs::pcrela64(view, object, psymval, addend,
2e702c99 4760 address);
2e30d253
ILT		 4761 break;
4762
4763 case elfcpp::R_X86_64_32:
c34c98ed
CC		 4764 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
4765 Reloc_funcs::CHECK_UNSIGNED);
2e30d253
ILT		 4766 break;
4767
4768 case elfcpp::R_X86_64_32S:
c34c98ed
CC		 4769 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
4770 Reloc_funcs::CHECK_SIGNED);
2e30d253
ILT		 4771 break;
4772
4773 case elfcpp::R_X86_64_PC32:
f49fe902 4774 case elfcpp::R_X86_64_PC32_BND:
c34c98ed 4775 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 4776 address);
2e30d253
ILT		 4777 break;
4778
4779 case elfcpp::R_X86_64_16:
c34c98ed 4780 Reloc_funcs::rela16(view, object, psymval, addend);
2e30d253
ILT		 4781 break;
4782
4783 case elfcpp::R_X86_64_PC16:
c34c98ed 4784 Reloc_funcs::pcrela16(view, object, psymval, addend, address);
2e30d253
ILT		 4785 break;
4786
4787 case elfcpp::R_X86_64_8:
c34c98ed 4788 Reloc_funcs::rela8(view, object, psymval, addend);
2e30d253
ILT		 4789 break;
4790
4791 case elfcpp::R_X86_64_PC8:
c34c98ed 4792 Reloc_funcs::pcrela8(view, object, psymval, addend, address);
2e30d253
ILT		 4793 break;
4794
4795 case elfcpp::R_X86_64_PLT32:
f49fe902 4796 case elfcpp::R_X86_64_PLT32_BND:
f389a824 4797 gold_assert(gsym == NULL
2e702c99 4798 || gsym->has_plt_offset()
99f8faca
ILT		 4799 || gsym->final_value_is_known()
4800 || (gsym->is_defined()
4801 && !gsym->is_from_dynobj()
4802 && !gsym->is_preemptible()));
ee9e9e86
ILT		 4803 // Note: while this code looks the same as for R_X86_64_PC32, it
4804 // behaves differently because psymval was set to point to
4805 // the PLT entry, rather than the symbol, in Scan::global().
c34c98ed 4806 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 4807 address);
2e30d253
ILT		 4808 break;
4809
ee9e9e86
ILT		 4810 case elfcpp::R_X86_64_PLTOFF64:
4811 {
2e702c99
RM		 4812 gold_assert(gsym);
4813 gold_assert(gsym->has_plt_offset()
4814 || gsym->final_value_is_known());
fc51264f 4815 typename elfcpp::Elf_types<size>::Elf_Addr got_address;
c23dd342
L		 4816 // This is the address of GLOBAL_OFFSET_TABLE.
4817 got_address = target->got_plt_section()->address();
c34c98ed 4818 Reloc_funcs::rela64(view, object, psymval, addend - got_address);
ee9e9e86 4819 }
7849f6d8 4820 break;
ee9e9e86 4821
2e30d253 4822 case elfcpp::R_X86_64_GOT32:
0ffd9845 4823 gold_assert(have_got_offset);
c34c98ed 4824 Reloc_funcs::rela32(view, got_offset, addend);
2e30d253
ILT		 4825 break;
4826
e822f2b1
ILT		 4827 case elfcpp::R_X86_64_GOTPC32:
4828 {
2e702c99 4829 gold_assert(gsym);
fc51264f 4830 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 4831 value = target->got_plt_section()->address();
19ef3f4d 4832 Reloc_funcs::pcrela32_check(view, value, addend, address);
e822f2b1
ILT		 4833 }
4834 break;
4835
4836 case elfcpp::R_X86_64_GOT64:
fdc2f80f 4837 case elfcpp::R_X86_64_GOTPLT64:
de194d85 4838 // R_X86_64_GOTPLT64 is obsolete and treated the same as
e88ba8d5 4839 // GOT64.
0ffd9845 4840 gold_assert(have_got_offset);
c34c98ed 4841 Reloc_funcs::rela64(view, got_offset, addend);
e822f2b1
ILT		 4842 break;
4843
4844 case elfcpp::R_X86_64_GOTPC64:
4845 {
2e702c99 4846 gold_assert(gsym);
fc51264f 4847 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 4848 value = target->got_plt_section()->address();
c34c98ed 4849 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 4850 }
4851 break;
4852
2e30d253
ILT		 4853 case elfcpp::R_X86_64_GOTOFF64:
4854 {
ea8e302e
AM		 4855 typename elfcpp::Elf_types<size>::Elf_Addr reladdr;
4856 reladdr = target->got_plt_section()->address();
4857 Reloc_funcs::pcrela64(view, object, psymval, addend, reladdr);
2e30d253
ILT		 4858 }
4859 break;
4860
4861 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 4862 case elfcpp::R_X86_64_GOTPCRELX:
4863 case elfcpp::R_X86_64_REX_GOTPCRELX:
2e30d253 4864 {
1fa29f10
IT		 4865 // Convert
4866 // mov foo@GOTPCREL(%rip), %reg
4867 // to lea foo(%rip), %reg.
4868 // if possible.
158600eb
CC		 4869 if (!parameters->incremental()
4870 && ((gsym == NULL
4871 && rela.get_r_offset() >= 2
4872 && view[-2] == 0x8b
4873 && !psymval->is_ifunc_symbol())
4874 || (gsym != NULL
4875 && rela.get_r_offset() >= 2
4876 && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
4877 0, &view))))
1fa29f10
IT		 4878 {
4879 view[-2] = 0x8d;
19ef3f4d 4880 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
1fa29f10 4881 }
3a4f096e
ST		 4882 // Convert
4883 // callq *foo@GOTPCRELX(%rip) to
4884 // addr32 callq foo
4885 // and jmpq *foo@GOTPCRELX(%rip) to
4886 // jmpq foo
4887 // nop
158600eb
CC		 4888 else if (!parameters->incremental()
4889 && gsym != NULL
3a4f096e
ST		 4890 && rela.get_r_offset() >= 2
4891 && Target_x86_64<size>::can_convert_callq_to_direct(gsym,
4892 r_type,
4893 0, &view))
4894 {
4895 if (view[-1] == 0x15)
4896 {
4897 // Convert callq *foo@GOTPCRELX(%rip) to addr32 callq.
4898 // Opcode of addr32 is 0x67 and opcode of direct callq is 0xe8.
4899 view[-2] = 0x67;
4900 view[-1] = 0xe8;
4901 // Convert GOTPCRELX to 32-bit pc relative reloc.
4902 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
4903 }
4904 else
4905 {
4906 // Convert jmpq *foo@GOTPCRELX(%rip) to
4907 // jmpq foo
4908 // nop
4909 // The opcode of direct jmpq is 0xe9.
4910 view[-2] = 0xe9;
4911 // The opcode of nop is 0x90.
4912 view[3] = 0x90;
4913 // Convert GOTPCRELX to 32-bit pc relative reloc. jmpq is rip
4914 // relative and since the instruction following the jmpq is now
4915 // the nop, offset the address by 1 byte. The start of the
4916 // relocation also moves ahead by 1 byte.
4917 Reloc_funcs::pcrela32(&view[-1], object, psymval, addend,
4918 address - 1);
4919 }
4920 }
1fa29f10
IT		 4921 else
4922 {
4923 if (gsym != NULL)
4924 {
4925 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
ed35cc4a
CC		 4926 got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
4927 - target->got_size());
1fa29f10
IT		 4928 }
4929 else
4930 {
4931 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
ed35cc4a
CC		 4932 gold_assert(object->local_has_got_offset(r_sym,
4933 GOT_TYPE_STANDARD));
1fa29f10
IT		 4934 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
4935 - target->got_size());
4936 }
4937 typename elfcpp::Elf_types<size>::Elf_Addr value;
4938 value = target->got_plt_section()->address() + got_offset;
19ef3f4d 4939 Reloc_funcs::pcrela32_check(view, value, addend, address);
1fa29f10 4940 }
2e30d253
ILT		 4941 }
4942 break;
4943
e822f2b1
ILT		 4944 case elfcpp::R_X86_64_GOTPCREL64:
4945 {
2e702c99
RM		 4946 gold_assert(have_got_offset);
4947 typename elfcpp::Elf_types<size>::Elf_Addr value;
4948 value = target->got_plt_section()->address() + got_offset;
c34c98ed 4949 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 4950 }
4951 break;
4952
2e30d253
ILT		 4953 case elfcpp::R_X86_64_COPY:
4954 case elfcpp::R_X86_64_GLOB_DAT:
4955 case elfcpp::R_X86_64_JUMP_SLOT:
4956 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 4957 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 4958 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 4959 case elfcpp::R_X86_64_TPOFF64:
2e30d253 4960 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 4961 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 4962 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4963 _("unexpected reloc %u in object file"),
4964 r_type);
2e30d253
ILT		 4965 break;
4966
d61c17ea 4967 // These are initial tls relocs, which are expected when linking
56622147
ILT		 4968 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
4969 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 4970 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 4971 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 4972 case elfcpp::R_X86_64_DTPOFF32:
4973 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 4974 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
4975 case elfcpp::R_X86_64_TPOFF32: // Local-exec
7bf1f802 4976 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
2e702c99 4977 view, address, view_size);
2e30d253 4978 break;
2e30d253 4979
fdc2f80f
ILT		 4980 case elfcpp::R_X86_64_SIZE32:
4981 case elfcpp::R_X86_64_SIZE64:
2e30d253 4982 default:
75f2446e
ILT		 4983 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4984 _("unsupported reloc %u"),
4985 r_type);
2e30d253
ILT		 4986 break;
4987 }
4988
c34c98ed 4989 if (rstatus == Reloc_funcs::RELOC_OVERFLOW)
17ecd016
CC		 4990 {
4991 if (gsym == NULL)
4992 {
4993 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
4994 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4995 _("relocation overflow: "
4996 "reference to local symbol %u in %s"),
4997 r_sym, object->name().c_str());
4998 }
4999 else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT)
5000 {
5001 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5002 _("relocation overflow: "
5003 "reference to '%s' defined in %s"),
5004 gsym->name(),
5005 gsym->object()->name().c_str());
5006 }
5007 else
5008 {
5009 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5010 _("relocation overflow: reference to '%s'"),
5011 gsym->name());
5012 }
5013 }
c34c98ed 5014
2e30d253
ILT		 5015 return true;
5016}
5017
5018// Perform a TLS relocation.
5019
fc51264f 5020template<int size>
2e30d253 5021inline void
fc51264f
L		 5022Target_x86_64<size>::Relocate::relocate_tls(
5023 const Relocate_info<size, false>* relinfo,
5024 Target_x86_64<size>* target,
5025 size_t relnum,
5026 const elfcpp::Rela<size, false>& rela,
5027 unsigned int r_type,
5028 const Sized_symbol<size>* gsym,
5029 const Symbol_value<size>* psymval,
5030 unsigned char* view,
5031 typename elfcpp::Elf_types<size>::Elf_Addr address,
5032 section_size_type view_size)
2e30d253 5033{
2e30d253 5034 Output_segment* tls_segment = relinfo->layout->tls_segment();
7bf1f802 5035
fc51264f 5036 const Sized_relobj_file<size, false>* object = relinfo->object;
6a41d30b 5037 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 5038 elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
36171d64 5039 bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
2e30d253 5040
fc51264f 5041 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
2e30d253
ILT		 5042
5043 const bool is_final = (gsym == NULL
b3705d2a 5044 ? !parameters->options().shared()
2e30d253 5045 : gsym->final_value_is_known());
36171d64 5046 tls::Tls_optimization optimized_type
fc51264f 5047 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 5048 switch (r_type)
5049 {
56622147 5050 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
36171d64
CC		 5051 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
5052 {
5053 // If this code sequence is used in a non-executable section,
5054 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
5055 // on the assumption that it's being used by itself in a debug
5056 // section. Therefore, in the unlikely event that the code
5057 // sequence appears in a non-executable section, we simply
5058 // leave it unoptimized.
5059 optimized_type = tls::TLSOPT_NONE;
5060 }
e041f13d 5061 if (optimized_type == tls::TLSOPT_TO_LE)
2e30d253 5062 {
62855347
ILT		 5063 if (tls_segment == NULL)
5064 {
191f1a2d
ILT		 5065 gold_assert(parameters->errors()->error_count() > 0
5066 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5067 return;
5068 }
2e30d253 5069 this->tls_gd_to_le(relinfo, relnum, tls_segment,
72ec2876 5070 rela, r_type, value, view,
2e30d253
ILT		 5071 view_size);
5072 break;
5073 }
7bf1f802 5074 else
2e702c99
RM		 5075 {
5076 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
5077 ? GOT_TYPE_TLS_OFFSET
5078 : GOT_TYPE_TLS_PAIR);
5079 unsigned int got_offset;
5080 if (gsym != NULL)
5081 {
5082 gold_assert(gsym->has_got_offset(got_type));
5083 got_offset = gsym->got_offset(got_type) - target->got_size();
5084 }
5085 else
5086 {
5087 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5088 gold_assert(object->local_has_got_offset(r_sym, got_type));
5089 got_offset = (object->local_got_offset(r_sym, got_type)
5090 - target->got_size());
5091 }
5092 if (optimized_type == tls::TLSOPT_TO_IE)
5093 {
5094 value = target->got_plt_section()->address() + got_offset;
d21f123b 5095 this->tls_gd_to_ie(relinfo, relnum, rela, r_type,
2e702c99
RM		 5096 value, view, address, view_size);
5097 break;
5098 }
5099 else if (optimized_type == tls::TLSOPT_NONE)
5100 {
5101 // Relocate the field with the offset of the pair of GOT
5102 // entries.
6a41d30b 5103 value = target->got_plt_section()->address() + got_offset;
2e702c99 5104 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5105 address);
2e702c99
RM		 5106 break;
5107 }
5108 }
72ec2876 5109 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 5110 _("unsupported reloc %u"), r_type);
2e30d253
ILT		 5111 break;
5112
c2b45e22
CC		 5113 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
5114 case elfcpp::R_X86_64_TLSDESC_CALL:
36171d64
CC		 5115 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
5116 {
5117 // See above comment for R_X86_64_TLSGD.
5118 optimized_type = tls::TLSOPT_NONE;
5119 }
c2b45e22
CC		 5120 if (optimized_type == tls::TLSOPT_TO_LE)
5121 {
62855347
ILT		 5122 if (tls_segment == NULL)
5123 {
191f1a2d
ILT		 5124 gold_assert(parameters->errors()->error_count() > 0
5125 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5126 return;
5127 }
c2b45e22 5128 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2e702c99
RM		 5129 rela, r_type, value, view,
5130 view_size);
c2b45e22
CC		 5131 break;
5132 }
5133 else
2e702c99
RM		 5134 {
5135 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
5136 ? GOT_TYPE_TLS_OFFSET
5137 : GOT_TYPE_TLS_DESC);
5138 unsigned int got_offset = 0;
a8df5856
ILT		 5139 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
5140 && optimized_type == tls::TLSOPT_NONE)
5141 {
5142 // We created GOT entries in the .got.tlsdesc portion of
5143 // the .got.plt section, but the offset stored in the
5144 // symbol is the offset within .got.tlsdesc.
5145 got_offset = (target->got_size()
5146 + target->got_plt_section()->data_size());
5147 }
2e702c99
RM		 5148 if (gsym != NULL)
5149 {
5150 gold_assert(gsym->has_got_offset(got_type));
5151 got_offset += gsym->got_offset(got_type) - target->got_size();
5152 }
5153 else
5154 {
5155 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5156 gold_assert(object->local_has_got_offset(r_sym, got_type));
5157 got_offset += (object->local_got_offset(r_sym, got_type)
a8df5856 5158 - target->got_size());
2e702c99
RM		 5159 }
5160 if (optimized_type == tls::TLSOPT_TO_IE)
5161 {
2e702c99 5162 value = target->got_plt_section()->address() + got_offset;
d21f123b 5163 this->tls_desc_gd_to_ie(relinfo, relnum,
2e702c99
RM		 5164 rela, r_type, value, view, address,
5165 view_size);
5166 break;
5167 }
5168 else if (optimized_type == tls::TLSOPT_NONE)
5169 {
5170 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
5171 {
5172 // Relocate the field with the offset of the pair of GOT
5173 // entries.
5174 value = target->got_plt_section()->address() + got_offset;
5175 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5176 address);
2e702c99
RM		 5177 }
5178 break;
5179 }
5180 }
c2b45e22
CC		 5181 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5182 _("unsupported reloc %u"), r_type);
5183 break;
5184
56622147 5185 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
36171d64
CC		 5186 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
5187 {
5188 // See above comment for R_X86_64_TLSGD.
5189 optimized_type = tls::TLSOPT_NONE;
5190 }
e041f13d 5191 if (optimized_type == tls::TLSOPT_TO_LE)
2e702c99 5192 {
62855347
ILT		 5193 if (tls_segment == NULL)
5194 {
191f1a2d
ILT		 5195 gold_assert(parameters->errors()->error_count() > 0
5196 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5197 return;
5198 }
72ec2876
ILT		 5199 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
5200 value, view, view_size);
5201 break;
2e702c99 5202 }
7bf1f802 5203 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 5204 {
5205 // Relocate the field with the offset of the GOT entry for
5206 // the module index.
5207 unsigned int got_offset;
5208 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
31d60480 5209 - target->got_size());
6a41d30b 5210 value = target->got_plt_section()->address() + got_offset;
2e702c99 5211 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5212 address);
2e702c99
RM		 5213 break;
5214 }
72ec2876 5215 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 5216 _("unsupported reloc %u"), r_type);
2e30d253 5217 break;
0ffd9845
ILT		 5218
5219 case elfcpp::R_X86_64_DTPOFF32:
36171d64
CC		 5220 // This relocation type is used in debugging information.
5221 // In that case we need to not optimize the value. If the
5222 // section is not executable, then we assume we should not
5223 // optimize this reloc. See comments above for R_X86_64_TLSGD,
5224 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
5225 // R_X86_64_TLSLD.
5226 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
5227 {
62855347
ILT		 5228 if (tls_segment == NULL)
5229 {
191f1a2d
ILT		 5230 gold_assert(parameters->errors()->error_count() > 0
5231 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5232 return;
5233 }
36171d64
CC		 5234 value -= tls_segment->memsz();
5235 }
fc51264f 5236 Relocate_functions<size, false>::rela32(view, value, addend);
0ffd9845
ILT		 5237 break;
5238
5239 case elfcpp::R_X86_64_DTPOFF64:
36171d64
CC		 5240 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
5241 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
5242 {
62855347
ILT		 5243 if (tls_segment == NULL)
5244 {
191f1a2d
ILT		 5245 gold_assert(parameters->errors()->error_count() > 0
5246 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5247 return;
5248 }
36171d64
CC		 5249 value -= tls_segment->memsz();
5250 }
fc51264f 5251 Relocate_functions<size, false>::rela64(view, value, addend);
0ffd9845 5252 break;
2e30d253 5253
56622147 5254 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
24dd5808
CC		 5255 if (gsym != NULL
5256 && gsym->is_undefined()
5257 && parameters->options().output_is_executable())
65d92137
CC		 5258 {
5259 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
5260 NULL, rela,
5261 r_type, value, view,
5262 view_size);
5263 break;
5264 }
5265 else if (optimized_type == tls::TLSOPT_TO_LE)
56622147 5266 {
62855347
ILT		 5267 if (tls_segment == NULL)
5268 {
191f1a2d
ILT		 5269 gold_assert(parameters->errors()->error_count() > 0
5270 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5271 return;
5272 }
fc51264f
L		 5273 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
5274 tls_segment, rela,
5275 r_type, value, view,
5276 view_size);
56622147
ILT		 5277 break;
5278 }
7bf1f802 5279 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 5280 {
5281 // Relocate the field with the offset of the GOT entry for
5282 // the tp-relative offset of the symbol.
5283 unsigned int got_offset;
5284 if (gsym != NULL)
5285 {
5286 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
5287 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
5288 - target->got_size());
5289 }
5290 else
5291 {
5292 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
5293 gold_assert(object->local_has_got_offset(r_sym,
5294 GOT_TYPE_TLS_OFFSET));
5295 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
5296 - target->got_size());
5297 }
6a41d30b 5298 value = target->got_plt_section()->address() + got_offset;
2e702c99 5299 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 5300 address);
2e702c99
RM		 5301 break;
5302 }
56622147
ILT		 5303 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
5304 _("unsupported reloc type %u"),
5305 r_type);
5306 break;
0ffd9845 5307
56622147 5308 case elfcpp::R_X86_64_TPOFF32: // Local-exec
62855347
ILT		 5309 if (tls_segment == NULL)
5310 {
191f1a2d
ILT		 5311 gold_assert(parameters->errors()->error_count() > 0
5312 || issue_undefined_symbol_error(gsym));
62855347
ILT		 5313 return;
5314 }
6a41d30b 5315 value -= tls_segment->memsz();
fc51264f 5316 Relocate_functions<size, false>::rela32(view, value, addend);
56622147 5317 break;
2e30d253 5318 }
2e30d253
ILT		 5319}
5320
7bf1f802
ILT		 5321// Do a relocation in which we convert a TLS General-Dynamic to an
5322// Initial-Exec.
5323
fc51264f 5324template<int size>
7bf1f802 5325inline void
fc51264f
L		 5326Target_x86_64<size>::Relocate::tls_gd_to_ie(
5327 const Relocate_info<size, false>* relinfo,
5328 size_t relnum,
fc51264f
L		 5329 const elfcpp::Rela<size, false>& rela,
5330 unsigned int,
5331 typename elfcpp::Elf_types<size>::Elf_Addr value,
5332 unsigned char* view,
5333 typename elfcpp::Elf_types<size>::Elf_Addr address,
5334 section_size_type view_size)
7bf1f802 5335{
41194d9f
L		 5336 // For SIZE == 64:
5337 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5338 // .word 0x6666; rex64; call __tls_get_addr@PLT
5339 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
5340 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
5341 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f
L		 5342 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
5343 // For SIZE == 32:
5344 // leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5345 // .word 0x6666; rex64; call __tls_get_addr@PLT
5346 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
5347 // leaq foo@tlsgd(%rip),%rdi;
5348 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f 5349 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
7bf1f802 5350
7bf1f802 5351 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
7bf1f802 5352 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ad961eab
L		 5353 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
5354 || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
7bf1f802 5355
41194d9f
L		 5356 if (size == 64)
5357 {
5358 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5359 -4);
5360 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5361 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
5362 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
5363 16);
5364 }
5365 else
5366 {
5367 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5368 -3);
5369 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5370 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
5371 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
5372 15);
5373 }
7bf1f802 5374
c2b45e22 5375 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f
L		 5376 Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
5377 address);
7bf1f802
ILT		 5378
5379 // The next reloc should be a PLT32 reloc against __tls_get_addr.
5380 // We can skip it.
5381 this->skip_call_tls_get_addr_ = true;
5382}
5383
e041f13d 5384// Do a relocation in which we convert a TLS General-Dynamic to a
2e30d253
ILT		 5385// Local-Exec.
5386
fc51264f 5387template<int size>
2e30d253 5388inline void
fc51264f
L		 5389Target_x86_64<size>::Relocate::tls_gd_to_le(
5390 const Relocate_info<size, false>* relinfo,
5391 size_t relnum,
5392 Output_segment* tls_segment,
5393 const elfcpp::Rela<size, false>& rela,
5394 unsigned int,
5395 typename elfcpp::Elf_types<size>::Elf_Addr value,
5396 unsigned char* view,
5397 section_size_type view_size)
2e30d253 5398{
41194d9f
L		 5399 // For SIZE == 64:
5400 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5401 // .word 0x6666; rex64; call __tls_get_addr@PLT
5402 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
5403 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
5404 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f
L		 5405 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
5406 // For SIZE == 32:
5407 // leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 5408 // .word 0x6666; rex64; call __tls_get_addr@PLT
5409 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
5410 // leaq foo@tlsgd(%rip),%rdi;
5411 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f 5412 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
2e30d253 5413
72ec2876 5414 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
72ec2876 5415 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ad961eab
L		 5416 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
5417 || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
41194d9f
L		 5418
5419 if (size == 64)
5420 {
5421 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5422 -4);
5423 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5424 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
5425 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
5426 16);
5427 }
5428 else
5429 {
5430 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
5431 -3);
5432 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5433 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
2e30d253 5434
41194d9f
L		 5435 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
5436 15);
5437 }
2e30d253 5438
6a41d30b 5439 value -= tls_segment->memsz();
fc51264f 5440 Relocate_functions<size, false>::rela32(view + 8, value, 0);
2e30d253
ILT		 5441
5442 // The next reloc should be a PLT32 reloc against __tls_get_addr.
5443 // We can skip it.
5444 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 5445}
5446
c2b45e22
CC		 5447// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
5448
fc51264f 5449template<int size>
c2b45e22 5450inline void
fc51264f
L		 5451Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
5452 const Relocate_info<size, false>* relinfo,
c2b45e22 5453 size_t relnum,
fc51264f 5454 const elfcpp::Rela<size, false>& rela,
c2b45e22 5455 unsigned int r_type,
fc51264f 5456 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 5457 unsigned char* view,
fc51264f 5458 typename elfcpp::Elf_types<size>::Elf_Addr address,
c2b45e22
CC		 5459 section_size_type view_size)
5460{
5461 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
5462 {
5463 // leaq foo@tlsdesc(%rip), %rax
5464 // ==> movq foo@gottpoff(%rip), %rax
5465 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5466 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
5467 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 5468 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 5469 view[-2] = 0x8b;
5470 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 5471 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
c2b45e22
CC		 5472 }
5473 else
5474 {
5475 // call *foo@tlscall(%rax)
5476 // ==> nop; nop
5477 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
5478 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
5479 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 5480 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 5481 view[0] = 0x66;
5482 view[1] = 0x90;
5483 }
5484}
5485
5486// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
5487
fc51264f 5488template<int size>
c2b45e22 5489inline void
fc51264f
L		 5490Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
5491 const Relocate_info<size, false>* relinfo,
c2b45e22
CC		 5492 size_t relnum,
5493 Output_segment* tls_segment,
fc51264f 5494 const elfcpp::Rela<size, false>& rela,
c2b45e22 5495 unsigned int r_type,
fc51264f 5496 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 5497 unsigned char* view,
5498 section_size_type view_size)
5499{
5500 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
5501 {
5502 // leaq foo@tlsdesc(%rip), %rax
5503 // ==> movq foo@tpoff, %rax
5504 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5505 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
5506 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 5507 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 5508 view[-2] = 0xc7;
5509 view[-1] = 0xc0;
5510 value -= tls_segment->memsz();
fc51264f 5511 Relocate_functions<size, false>::rela32(view, value, 0);
c2b45e22
CC		 5512 }
5513 else
5514 {
5515 // call *foo@tlscall(%rax)
5516 // ==> nop; nop
5517 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
5518 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
5519 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 5520 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 5521 view[0] = 0x66;
5522 view[1] = 0x90;
5523 }
5524}
5525
fc51264f 5526template<int size>
2e30d253 5527inline void
fc51264f
L		 5528Target_x86_64<size>::Relocate::tls_ld_to_le(
5529 const Relocate_info<size, false>* relinfo,
5530 size_t relnum,
5531 Output_segment*,
5532 const elfcpp::Rela<size, false>& rela,
5533 unsigned int,
5534 typename elfcpp::Elf_types<size>::Elf_Addr,
5535 unsigned char* view,
5536 section_size_type view_size)
2e30d253 5537{
72ec2876 5538 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
d2cf1c6c 5539 // For SIZE == 64:
72ec2876
ILT		 5540 // ... leq foo@dtpoff(%rax),%reg
5541 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
d2cf1c6c
L		 5542 // For SIZE == 32:
5543 // ... leq foo@dtpoff(%rax),%reg
5544 // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
ad961eab
L		 5545 // leaq foo@tlsld(%rip),%rdi; call *__tls_get_addr@GOTPCREL(%rip)
5546 // For SIZE == 64:
5547 // ... leq foo@dtpoff(%rax),%reg
5548 // ==> .word 0x6666; .byte 0x6666; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
5549 // For SIZE == 32:
5550 // ... leq foo@dtpoff(%rax),%reg
5551 // ==> nopw 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
2e30d253 5552
72ec2876
ILT		 5553 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5554 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
2e30d253 5555
72ec2876 5556 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 5557 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
72ec2876 5558
ad961eab
L		 5559 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
5560 view[4] == 0xe8 || view[4] == 0xff);
72ec2876 5561
ad961eab
L		 5562 if (view[4] == 0xe8)
5563 {
5564 if (size == 64)
5565 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
5566 else
5567 memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
5568 }
d2cf1c6c 5569 else
ad961eab
L		 5570 {
5571 if (size == 64)
5572 memcpy(view - 3, "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0",
5573 13);
5574 else
5575 memcpy(view - 3, "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0",
5576 13);
5577 }
72ec2876
ILT		 5578
5579 // The next reloc should be a PLT32 reloc against __tls_get_addr.
5580 // We can skip it.
5581 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 5582}
5583
56622147
ILT		 5584// Do a relocation in which we convert a TLS Initial-Exec to a
5585// Local-Exec.
5586
fc51264f 5587template<int size>
56622147 5588inline void
fc51264f
L		 5589Target_x86_64<size>::Relocate::tls_ie_to_le(
5590 const Relocate_info<size, false>* relinfo,
5591 size_t relnum,
5592 Output_segment* tls_segment,
5593 const elfcpp::Rela<size, false>& rela,
5594 unsigned int,
5595 typename elfcpp::Elf_types<size>::Elf_Addr value,
5596 unsigned char* view,
5597 section_size_type view_size)
56622147
ILT		 5598{
5599 // We need to examine the opcodes to figure out which instruction we
5600 // are looking at.
5601
5602 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
5603 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
5604
5605 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
5606 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
5607
5608 unsigned char op1 = view[-3];
5609 unsigned char op2 = view[-2];
5610 unsigned char op3 = view[-1];
5611 unsigned char reg = op3 >> 3;
5612
5613 if (op2 == 0x8b)
5614 {
5615 // movq
5616 if (op1 == 0x4c)
2e702c99 5617 view[-3] = 0x49;
e749cab8
L		 5618 else if (size == 32 && op1 == 0x44)
5619 view[-3] = 0x41;
56622147
ILT		 5620 view[-2] = 0xc7;
5621 view[-1] = 0xc0 | reg;
5622 }
5623 else if (reg == 4)
5624 {
5625 // Special handling for %rsp.
5626 if (op1 == 0x4c)
2e702c99 5627 view[-3] = 0x49;
e749cab8
L		 5628 else if (size == 32 && op1 == 0x44)
5629 view[-3] = 0x41;
56622147
ILT		 5630 view[-2] = 0x81;
5631 view[-1] = 0xc0 | reg;
5632 }
5633 else
5634 {
5635 // addq
5636 if (op1 == 0x4c)
2e702c99 5637 view[-3] = 0x4d;
e749cab8
L		 5638 else if (size == 32 && op1 == 0x44)
5639 view[-3] = 0x45;
56622147
ILT		 5640 view[-2] = 0x8d;
5641 view[-1] = 0x80 | reg | (reg << 3);
5642 }
5643
65d92137
CC		 5644 if (tls_segment != NULL)
5645 value -= tls_segment->memsz();
fc51264f 5646 Relocate_functions<size, false>::rela32(view, value, 0);
56622147
ILT		 5647}
5648
2e30d253
ILT		 5649// Relocate section data.
5650
fc51264f 5651template<int size>
2e30d253 5652void
fc51264f
L		 5653Target_x86_64<size>::relocate_section(
5654 const Relocate_info<size, false>* relinfo,
364c7fa5
ILT		 5655 unsigned int sh_type,
5656 const unsigned char* prelocs,
5657 size_t reloc_count,
5658 Output_section* output_section,
5659 bool needs_special_offset_handling,
5660 unsigned char* view,
fc51264f 5661 typename elfcpp::Elf_types<size>::Elf_Addr address,
364c7fa5
ILT		 5662 section_size_type view_size,
5663 const Reloc_symbol_changes* reloc_symbol_changes)
2e30d253 5664{
4d625b70
CC		 5665 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5666 Classify_reloc;
5667
2e30d253
ILT		 5668 gold_assert(sh_type == elfcpp::SHT_RELA);
5669
4d625b70
CC		 5670 gold::relocate_section<size, false, Target_x86_64<size>, Relocate,
5671 gold::Default_comdat_behavior, Classify_reloc>(
2e30d253
ILT		 5672 relinfo,
5673 this,
5674 prelocs,
5675 reloc_count,
730cdc88
ILT		 5676 output_section,
5677 needs_special_offset_handling,
2e30d253
ILT		 5678 view,
5679 address,
364c7fa5
ILT		 5680 view_size,
5681 reloc_symbol_changes);
2e30d253
ILT		 5682}
5683
94a3fc8b
CC		 5684// Apply an incremental relocation. Incremental relocations always refer
5685// to global symbols.
5686
fc51264f 5687template<int size>
94a3fc8b 5688void
fc51264f
L		 5689Target_x86_64<size>::apply_relocation(
5690 const Relocate_info<size, false>* relinfo,
5691 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 5692 unsigned int r_type,
fc51264f 5693 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 5694 const Symbol* gsym,
5695 unsigned char* view,
fc51264f 5696 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 5697 section_size_type view_size)
5698{
fc51264f 5699 gold::apply_relocation<size, false, Target_x86_64<size>,
618d6666 5700 typename Target_x86_64<size>::Relocate>(
94a3fc8b
CC		 5701 relinfo,
5702 this,
5703 r_offset,
5704 r_type,
5705 r_addend,
5706 gsym,
5707 view,
5708 address,
5709 view_size);
5710}
5711
4d625b70 5712// Scan the relocs during a relocatable link.
6a74a719 5713
fc51264f 5714template<int size>
4d625b70
CC		 5715void
5716Target_x86_64<size>::scan_relocatable_relocs(
5717 Symbol_table* symtab,
5718 Layout* layout,
5719 Sized_relobj_file<size, false>* object,
5720 unsigned int data_shndx,
5721 unsigned int sh_type,
5722 const unsigned char* prelocs,
5723 size_t reloc_count,
5724 Output_section* output_section,
5725 bool needs_special_offset_handling,
5726 size_t local_symbol_count,
5727 const unsigned char* plocal_symbols,
5728 Relocatable_relocs* rr)
6a74a719 5729{
4d625b70
CC		 5730 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5731 Classify_reloc;
5732 typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
5733 Scan_relocatable_relocs;
6a74a719 5734
4d625b70 5735 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 5736
4d625b70
CC		 5737 gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>(
5738 symtab,
5739 layout,
5740 object,
5741 data_shndx,
5742 prelocs,
5743 reloc_count,
5744 output_section,
5745 needs_special_offset_handling,
5746 local_symbol_count,
5747 plocal_symbols,
5748 rr);
6a74a719
ILT		 5749}
5750
4d625b70 5751// Scan the relocs for --emit-relocs.
6a74a719 5752
fc51264f 5753template<int size>
6a74a719 5754void
4d625b70 5755Target_x86_64<size>::emit_relocs_scan(
fc51264f
L		 5756 Symbol_table* symtab,
5757 Layout* layout,
5758 Sized_relobj_file<size, false>* object,
5759 unsigned int data_shndx,
5760 unsigned int sh_type,
5761 const unsigned char* prelocs,
5762 size_t reloc_count,
5763 Output_section* output_section,
5764 bool needs_special_offset_handling,
5765 size_t local_symbol_count,
4d625b70 5766 const unsigned char* plocal_syms,
fc51264f 5767 Relocatable_relocs* rr)
6a74a719 5768{
4d625b70
CC		 5769 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5770 Classify_reloc;
5771 typedef gold::Default_emit_relocs_strategy<Classify_reloc>
5772 Emit_relocs_strategy;
6a74a719 5773
4d625b70 5774 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 5775
4d625b70 5776 gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>(
6a74a719
ILT		 5777 symtab,
5778 layout,
5779 object,
5780 data_shndx,
5781 prelocs,
5782 reloc_count,
5783 output_section,
5784 needs_special_offset_handling,
5785 local_symbol_count,
4d625b70 5786 plocal_syms,
6a74a719
ILT		 5787 rr);
5788}
5789
5790// Relocate a section during a relocatable link.
5791
fc51264f 5792template<int size>
6a74a719 5793void
7404fe1b 5794Target_x86_64<size>::relocate_relocs(
fc51264f 5795 const Relocate_info<size, false>* relinfo,
6a74a719
ILT		 5796 unsigned int sh_type,
5797 const unsigned char* prelocs,
5798 size_t reloc_count,
5799 Output_section* output_section,
62fe925a 5800 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
6a74a719 5801 unsigned char* view,
fc51264f 5802 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
6a74a719
ILT		 5803 section_size_type view_size,
5804 unsigned char* reloc_view,
5805 section_size_type reloc_view_size)
5806{
4d625b70
CC		 5807 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
5808 Classify_reloc;
5809
6a74a719
ILT		 5810 gold_assert(sh_type == elfcpp::SHT_RELA);
5811
4d625b70 5812 gold::relocate_relocs<size, false, Classify_reloc>(
6a74a719
ILT		 5813 relinfo,
5814 prelocs,
5815 reloc_count,
5816 output_section,
5817 offset_in_output_section,
6a74a719
ILT		 5818 view,
5819 view_address,
5820 view_size,
5821 reloc_view,
5822 reloc_view_size);
5823}
5824
4fb6c25d
ILT		 5825// Return the value to use for a dynamic which requires special
5826// treatment. This is how we support equality comparisons of function
5827// pointers across shared library boundaries, as described in the
5828// processor specific ABI supplement.
5829
fc51264f 5830template<int size>
4fb6c25d 5831uint64_t
fc51264f 5832Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4fb6c25d
ILT		 5833{
5834 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
19fec8c1 5835 return this->plt_address_for_global(gsym);
4fb6c25d
ILT		 5836}
5837
2e30d253
ILT		 5838// Return a string used to fill a code section with nops to take up
5839// the specified length.
5840
fc51264f 5841template<int size>
2e30d253 5842std::string
fc51264f 5843Target_x86_64<size>::do_code_fill(section_size_type length) const
2e30d253
ILT		 5844{
5845 if (length >= 16)
5846 {
5847 // Build a jmpq instruction to skip over the bytes.
5848 unsigned char jmp[5];
5849 jmp[0] = 0xe9;
04bf7072 5850 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2e30d253 5851 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2e702c99 5852 + std::string(length - 5, static_cast<char>(0x90)));
2e30d253
ILT		 5853 }
5854
5855 // Nop sequences of various lengths.
76677ad0
CC		 5856 const char nop1[1] = { '\x90' }; // nop
5857 const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
5858 const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
5859 const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
2e702c99 5860 '\x00'};
76677ad0
CC		 5861 const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
5862 '\x00', '\x00' };
5863 const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
2e702c99 5864 '\x44', '\x00', '\x00' };
76677ad0 5865 const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
2e702c99 5866 '\x00', '\x00', '\x00',
76677ad0
CC		 5867 '\x00' };
5868 const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
2e702c99 5869 '\x00', '\x00', '\x00',
76677ad0
CC		 5870 '\x00', '\x00' };
5871 const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
2e702c99 5872 '\x84', '\x00', '\x00',
76677ad0
CC		 5873 '\x00', '\x00', '\x00' };
5874 const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
2e702c99 5875 '\x1f', '\x84', '\x00',
76677ad0
CC		 5876 '\x00', '\x00', '\x00',
5877 '\x00' };
5878 const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
2e702c99 5879 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 5880 '\x00', '\x00', '\x00',
5881 '\x00', '\x00' };
5882 const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
2e702c99 5883 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 5884 '\x84', '\x00', '\x00',
5885 '\x00', '\x00', '\x00' };
5886 const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 5887 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 5888 '\x1f', '\x84', '\x00',
5889 '\x00', '\x00', '\x00',
2e702c99 5890 '\x00' };
76677ad0 5891 const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 5892 '\x66', '\x66', '\x2e', // data16
76677ad0
CC		 5893 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
5894 '\x00', '\x00', '\x00',
2e702c99 5895 '\x00', '\x00' };
76677ad0 5896 const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 5897 '\x66', '\x66', '\x66', // data16; data16
76677ad0
CC		 5898 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
5899 '\x84', '\x00', '\x00',
2e702c99 5900 '\x00', '\x00', '\x00' };
2e30d253
ILT		 5901
5902 const char* nops[16] = {
5903 NULL,
5904 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
5905 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
5906 };
5907
5908 return std::string(nops[length], length);
5909}
5910
e291e7b9
ILT		 5911// Return the addend to use for a target specific relocation. The
5912// only target specific relocation is R_X86_64_TLSDESC for a local
5913// symbol. We want to set the addend is the offset of the local
5914// symbol in the TLS segment.
5915
fc51264f 5916template<int size>
e291e7b9 5917uint64_t
fc51264f
L		 5918Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
5919 uint64_t) const
e291e7b9
ILT		 5920{
5921 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
5922 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
5923 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
5924 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
fc51264f 5925 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
e291e7b9
ILT		 5926 gold_assert(psymval->is_tls_symbol());
5927 // The value of a TLS symbol is the offset in the TLS segment.
5928 return psymval->value(ti.object, 0);
5929}
5930
02d7cd44
ILT		 5931// Return the value to use for the base of a DW_EH_PE_datarel offset
5932// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
5933// assembler can not write out the difference between two labels in
5934// different sections, so instead of using a pc-relative value they
5935// use an offset from the GOT.
5936
fc51264f 5937template<int size>
02d7cd44 5938uint64_t
fc51264f 5939Target_x86_64<size>::do_ehframe_datarel_base() const
02d7cd44
ILT		 5940{
5941 gold_assert(this->global_offset_table_ != NULL);
5942 Symbol* sym = this->global_offset_table_;
fc51264f 5943 Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
02d7cd44
ILT		 5944 return ssym->value();
5945}
5946
364c7fa5 5947// FNOFFSET in section SHNDX in OBJECT is the start of a function
9b547ce6 5948// compiled with -fsplit-stack. The function calls non-split-stack
364c7fa5
ILT		 5949// code. We have to change the function so that it always ensures
5950// that it has enough stack space to run some random function.
5951
4fc1b9d4
L		 5952static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 };
5953static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 };
5954static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 };
5955
5956static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 };
5957static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 };
5958static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 };
5959
fc51264f 5960template<int size>
364c7fa5 5961void
fc51264f
L		 5962Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
5963 section_offset_type fnoffset,
5964 section_size_type fnsize,
6e0813d3
CC		 5965 const unsigned char*,
5966 size_t,
fc51264f
L		 5967 unsigned char* view,
5968 section_size_type view_size,
5969 std::string* from,
5970 std::string* to) const
364c7fa5 5971{
4fc1b9d4
L		 5972 const char* const cmp_insn = reinterpret_cast<const char*>
5973 (size == 32 ? cmp_insn_32 : cmp_insn_64);
5974 const char* const lea_r10_insn = reinterpret_cast<const char*>
5975 (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64);
5976 const char* const lea_r11_insn = reinterpret_cast<const char*>
5977 (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64);
5978
5979 const size_t cmp_insn_len =
5980 (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64));
5981 const size_t lea_r10_insn_len =
5982 (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64));
5983 const size_t lea_r11_insn_len =
5984 (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64));
5985 const size_t nop_len = (size == 32 ? 7 : 8);
5986
364c7fa5
ILT		 5987 // The function starts with a comparison of the stack pointer and a
5988 // field in the TCB. This is followed by a jump.
5989
5990 // cmp %fs:NN,%rsp
4fc1b9d4
L		 5991 if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len)
5992 && fnsize > nop_len + 1)
364c7fa5
ILT		 5993 {
5994 // We will call __morestack if the carry flag is set after this
5995 // comparison. We turn the comparison into an stc instruction
5996 // and some nops.
5997 view[fnoffset] = '\xf9';
4fc1b9d4 5998 this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len);
364c7fa5
ILT		 5999 }
6000 // lea NN(%rsp),%r10
cbc999b9
ILT		 6001 // lea NN(%rsp),%r11
6002 else if ((this->match_view(view, view_size, fnoffset,
4fc1b9d4 6003 lea_r10_insn, lea_r10_insn_len)
cbc999b9 6004 || this->match_view(view, view_size, fnoffset,
4fc1b9d4 6005 lea_r11_insn, lea_r11_insn_len))
364c7fa5
ILT		 6006 && fnsize > 8)
6007 {
6008 // This is loading an offset from the stack pointer for a
6009 // comparison. The offset is negative, so we decrease the
6010 // offset by the amount of space we need for the stack. This
6011 // means we will avoid calling __morestack if there happens to
6012 // be plenty of space on the stack already.
6013 unsigned char* pval = view + fnoffset + 4;
6014 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
6015 val -= parameters->options().split_stack_adjust_size();
6016 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
6017 }
6018 else
6019 {
6020 if (!object->has_no_split_stack())
6021 object->error(_("failed to match split-stack sequence at "
6022 "section %u offset %0zx"),
ac33a407 6023 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 6024 return;
6025 }
6026
6027 // We have to change the function so that it calls
6028 // __morestack_non_split instead of __morestack. The former will
6029 // allocate additional stack space.
6030 *from = "__morestack";
6031 *to = "__morestack_non_split";
6032}
6033
2e702c99
RM		 6034// The selector for x86_64 object files. Note this is never instantiated
6035// directly. It's only used in Target_selector_x86_64_nacl, below.
2e30d253 6036
fc51264f 6037template<int size>
36959681 6038class Target_selector_x86_64 : public Target_selector_freebsd
2e30d253
ILT		 6039{
6040public:
6041 Target_selector_x86_64()
fc51264f 6042 : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
2e702c99 6043 (size == 64
fc51264f 6044 ? "elf64-x86-64" : "elf32-x86-64"),
2e702c99 6045 (size == 64
fc51264f
L		 6046 ? "elf64-x86-64-freebsd"
6047 : "elf32-x86-64-freebsd"),
6048 (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
2e30d253
ILT		 6049 { }
6050
6051 Target*
e96caa79 6052 do_instantiate_target()
fc51264f 6053 { return new Target_x86_64<size>(); }
36959681 6054
2e30d253
ILT		 6055};
6056
2e702c99
RM		 6057// NaCl variant. It uses different PLT contents.
6058
6059template<int size>
6060class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
6061{
6062 public:
6063 Output_data_plt_x86_64_nacl(Layout* layout,
6064 Output_data_got<64, false>* got,
57b2284c 6065 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6066 Output_data_space* got_irelative)
6067 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
6068 got, got_plt, got_irelative)
6069 { }
6070
6071 Output_data_plt_x86_64_nacl(Layout* layout,
6072 Output_data_got<64, false>* got,
57b2284c 6073 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6074 Output_data_space* got_irelative,
6075 unsigned int plt_count)
6076 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
6077 got, got_plt, got_irelative,
6078 plt_count)
6079 { }
6080
6081 protected:
6082 virtual unsigned int
6083 do_get_plt_entry_size() const
6084 { return plt_entry_size; }
6085
6086 virtual void
6087 do_add_eh_frame(Layout* layout)
6088 {
6089 layout->add_eh_frame_for_plt(this,
6090 this->plt_eh_frame_cie,
6091 this->plt_eh_frame_cie_size,
6092 plt_eh_frame_fde,
6093 plt_eh_frame_fde_size);
6094 }
6095
6096 virtual void
6097 do_fill_first_plt_entry(unsigned char* pov,
6098 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
6099 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
6100
6101 virtual unsigned int
6102 do_fill_plt_entry(unsigned char* pov,
6103 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6104 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6105 unsigned int got_offset,
6106 unsigned int plt_offset,
6107 unsigned int plt_index);
6108
6109 virtual void
6110 do_fill_tlsdesc_entry(unsigned char* pov,
6111 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6112 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6113 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
6114 unsigned int tlsdesc_got_offset,
6115 unsigned int plt_offset);
6116
6117 private:
6118 // The size of an entry in the PLT.
6119 static const int plt_entry_size = 64;
6120
6121 // The first entry in the PLT.
6122 static const unsigned char first_plt_entry[plt_entry_size];
6123
6124 // Other entries in the PLT for an executable.
6125 static const unsigned char plt_entry[plt_entry_size];
6126
6127 // The reserved TLSDESC entry in the PLT for an executable.
6128 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
6129
6130 // The .eh_frame unwind information for the PLT.
6131 static const int plt_eh_frame_fde_size = 32;
6132 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
6133};
6134
6135template<int size>
6136class Target_x86_64_nacl : public Target_x86_64<size>
6137{
6138 public:
6139 Target_x86_64_nacl()
6140 : Target_x86_64<size>(&x86_64_nacl_info)
6141 { }
6142
6143 virtual Output_data_plt_x86_64<size>*
6144 do_make_data_plt(Layout* layout,
6145 Output_data_got<64, false>* got,
57b2284c 6146 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6147 Output_data_space* got_irelative)
6148 {
6149 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
6150 got_irelative);
6151 }
6152
6153 virtual Output_data_plt_x86_64<size>*
6154 do_make_data_plt(Layout* layout,
6155 Output_data_got<64, false>* got,
57b2284c 6156 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 6157 Output_data_space* got_irelative,
6158 unsigned int plt_count)
6159 {
6160 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
6161 got_irelative,
6162 plt_count);
6163 }
6164
93f8221c
RM		 6165 virtual std::string
6166 do_code_fill(section_size_type length) const;
6167
2e702c99
RM		 6168 private:
6169 static const Target::Target_info x86_64_nacl_info;
6170};
6171
6172template<>
6173const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
6174{
6175 64, // size
6176 false, // is_big_endian
6177 elfcpp::EM_X86_64, // machine_code
6178 false, // has_make_symbol
6179 false, // has_resolve
6180 true, // has_code_fill
6181 true, // is_default_stack_executable
6182 true, // can_icf_inline_merge_sections
6183 '\0', // wrap_char
6184 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
6185 0x20000, // default_text_segment_address
6186 0x10000, // abi_pagesize (overridable by -z max-page-size)
6187 0x10000, // common_pagesize (overridable by -z common-page-size)
6188 true, // isolate_execinstr
6189 0x10000000, // rosegment_gap
6190 elfcpp::SHN_UNDEF, // small_common_shndx
6191 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
6192 0, // small_common_section_flags
6193 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
6194 NULL, // attributes_section
a67858e0 6195 NULL, // attributes_vendor
8d9743bd
MK		 6196 "_start", // entry_symbol_name
6197 32, // hash_entry_size
bce5a025 6198 elfcpp::SHT_X86_64_UNWIND, // unwind_section_type
2e702c99
RM		 6199};
6200
6201template<>
6202const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
6203{
6204 32, // size
6205 false, // is_big_endian
6206 elfcpp::EM_X86_64, // machine_code
6207 false, // has_make_symbol
6208 false, // has_resolve
6209 true, // has_code_fill
6210 true, // is_default_stack_executable
6211 true, // can_icf_inline_merge_sections
6212 '\0', // wrap_char
6213 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
6214 0x20000, // default_text_segment_address
6215 0x10000, // abi_pagesize (overridable by -z max-page-size)
6216 0x10000, // common_pagesize (overridable by -z common-page-size)
6217 true, // isolate_execinstr
6218 0x10000000, // rosegment_gap
6219 elfcpp::SHN_UNDEF, // small_common_shndx
6220 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
6221 0, // small_common_section_flags
6222 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
6223 NULL, // attributes_section
a67858e0 6224 NULL, // attributes_vendor
8d9743bd
MK		 6225 "_start", // entry_symbol_name
6226 32, // hash_entry_size
bce5a025 6227 elfcpp::SHT_X86_64_UNWIND, // unwind_section_type
2e702c99
RM		 6228};
6229
6230#define NACLMASK 0xe0 // 32-byte alignment mask.
6231
6232// The first entry in the PLT.
6233
6234template<int size>
6235const unsigned char
6236Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
6237{
6238 0xff, 0x35, // pushq contents of memory address
6239 0, 0, 0, 0, // replaced with address of .got + 8
6240 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
6241 0, 0, 0, 0, // replaced with address of .got + 16
6242 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
6243 0x4d, 0x01, 0xfb, // add %r15, %r11
6244 0x41, 0xff, 0xe3, // jmpq *%r11
6245
6246 // 9-byte nop sequence to pad out to the next 32-byte boundary.
dd0845d7 6247 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
2e702c99
RM		 6248
6249 // 32 bytes of nop to pad out to the standard size
6250 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6251 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6252 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6253 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6254 0x66, // excess data32 prefix
6255 0x90 // nop
6256};
6257
6258template<int size>
6259void
6260Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
6261 unsigned char* pov,
6262 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6263 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
6264{
6265 memcpy(pov, first_plt_entry, plt_entry_size);
6266 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
6267 (got_address + 8
6268 - (plt_address + 2 + 4)));
6269 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
6270 (got_address + 16
6271 - (plt_address + 9 + 4)));
6272}
6273
6274// Subsequent entries in the PLT.
6275
6276template<int size>
6277const unsigned char
6278Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
6279{
6280 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
6281 0, 0, 0, 0, // replaced with address of symbol in .got
6282 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
6283 0x4d, 0x01, 0xfb, // add %r15, %r11
6284 0x41, 0xff, 0xe3, // jmpq *%r11
6285
6286 // 15-byte nop sequence to pad out to the next 32-byte boundary.
6287 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6288 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6289
6290 // Lazy GOT entries point here (32-byte aligned).
6291 0x68, // pushq immediate
6292 0, 0, 0, 0, // replaced with index into relocation table
6293 0xe9, // jmp relative
6294 0, 0, 0, 0, // replaced with offset to start of .plt0
6295
6296 // 22 bytes of nop to pad out to the standard size.
6297 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6298 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6299 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
6300};
6301
6302template<int size>
6303unsigned int
6304Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
6305 unsigned char* pov,
6306 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6307 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6308 unsigned int got_offset,
6309 unsigned int plt_offset,
6310 unsigned int plt_index)
6311{
6312 memcpy(pov, plt_entry, plt_entry_size);
6313 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
6314 (got_address + got_offset
6315 - (plt_address + plt_offset
6316 + 3 + 4)));
6317
6318 elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
6319 elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
6320 - (plt_offset + 38 + 4));
6321
6322 return 32;
6323}
6324
6325// The reserved TLSDESC entry in the PLT.
6326
6327template<int size>
6328const unsigned char
6329Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
6330{
6331 0xff, 0x35, // pushq x(%rip)
6332 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
6333 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
6334 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
6335 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
6336 0x4d, 0x01, 0xfb, // add %r15, %r11
6337 0x41, 0xff, 0xe3, // jmpq *%r11
6338
6339 // 41 bytes of nop to pad out to the standard size.
6340 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6341 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6342 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
6343 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6344 0x66, 0x66, // excess data32 prefixes
6345 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
6346};
6347
6348template<int size>
6349void
6350Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
6351 unsigned char* pov,
6352 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
6353 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
6354 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
6355 unsigned int tlsdesc_got_offset,
6356 unsigned int plt_offset)
6357{
6358 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
6359 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
6360 (got_address + 8
6361 - (plt_address + plt_offset
6362 + 2 + 4)));
6363 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
6364 (got_base
6365 + tlsdesc_got_offset
6366 - (plt_address + plt_offset
6367 + 9 + 4)));
6368}
6369
6370// The .eh_frame unwind information for the PLT.
6371
6372template<int size>
6373const unsigned char
6374Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
6375{
6376 0, 0, 0, 0, // Replaced with offset to .plt.
6377 0, 0, 0, 0, // Replaced with size of .plt.
6378 0, // Augmentation size.
6379 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
6380 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
6381 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
6382 elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
6383 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
6384 13, // Block length.
6385 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
6386 elfcpp::DW_OP_breg16, 0, // Push %rip.
6387 elfcpp::DW_OP_const1u, 63, // Push 0x3f.
6388 elfcpp::DW_OP_and, // & (%rip & 0x3f).
6389 elfcpp::DW_OP_const1u, 37, // Push 0x25.
6390 elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
6391 elfcpp::DW_OP_lit3, // Push 3.
6392 elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
6393 elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
6394 elfcpp::DW_CFA_nop, // Align to 32 bytes.
6395 elfcpp::DW_CFA_nop
6396};
6397
93f8221c
RM		 6398// Return a string used to fill a code section with nops.
6399// For NaCl, long NOPs are only valid if they do not cross
6400// bundle alignment boundaries, so keep it simple with one-byte NOPs.
6401template<int size>
6402std::string
6403Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
6404{
6405 return std::string(length, static_cast<char>(0x90));
6406}
6407
2e702c99
RM		 6408// The selector for x86_64-nacl object files.
6409
6410template<int size>
6411class Target_selector_x86_64_nacl
6412 : public Target_selector_nacl<Target_selector_x86_64<size>,
6413 Target_x86_64_nacl<size> >
6414{
6415 public:
6416 Target_selector_x86_64_nacl()
6417 : Target_selector_nacl<Target_selector_x86_64<size>,
6418 Target_x86_64_nacl<size> >("x86-64",
6419 size == 64
6420 ? "elf64-x86-64-nacl"
6421 : "elf32-x86-64-nacl",
6422 size == 64
6423 ? "elf_x86_64_nacl"
6424 : "elf32_x86_64_nacl")
6425 { }
6426};
6427
6428Target_selector_x86_64_nacl<64> target_selector_x86_64;
6429Target_selector_x86_64_nacl<32> target_selector_x32;
2e30d253
ILT		 6430
6431} // End anonymous namespace.
GDB Binutils - Deliverables
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