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bison warning fixes
[deliverable/binutils-gdb.git] / gold / x86_64.cc
CommitLineData
2e30d253
ILT		 1// x86_64.cc -- x86_64 target support for gold.
2
6f2750fe 3// Copyright (C) 2006-2016 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
7223e9ca
ILT		 182 // Return the number of PLT entries.
183 unsigned int
184 entry_count() const
67181c72 185 { return this->count_ + this->irelative_count_; }
7223e9ca
ILT		 186
187 // Return the offset of the first non-reserved PLT entry.
2e702c99 188 unsigned int
7223e9ca 189 first_plt_entry_offset()
2e702c99 190 { return this->get_plt_entry_size(); }
7223e9ca
ILT		 191
192 // Return the size of a PLT entry.
2e702c99
RM		 193 unsigned int
194 get_plt_entry_size() const
195 { return this->do_get_plt_entry_size(); }
7223e9ca 196
4829d394
CC		 197 // Reserve a slot in the PLT for an existing symbol in an incremental update.
198 void
199 reserve_slot(unsigned int plt_index)
200 {
2e702c99
RM		 201 this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(),
202 (plt_index + 2) * this->get_plt_entry_size());
4829d394
CC		 203 }
204
67181c72
ILT		 205 // Return the PLT address to use for a global symbol.
206 uint64_t
207 address_for_global(const Symbol*);
208
209 // Return the PLT address to use for a local symbol.
210 uint64_t
211 address_for_local(const Relobj*, unsigned int symndx);
212
2e702c99
RM		 213 // Add .eh_frame information for the PLT.
214 void
215 add_eh_frame(Layout* layout)
216 { this->do_add_eh_frame(layout); }
217
7223e9ca 218 protected:
2e702c99
RM		 219 // Fill in the first PLT entry.
220 void
221 fill_first_plt_entry(unsigned char* pov,
222 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
223 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
224 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
225
226 // Fill in a normal PLT entry. Returns the offset into the entry that
227 // should be the initial GOT slot value.
228 unsigned int
229 fill_plt_entry(unsigned char* pov,
230 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
231 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
232 unsigned int got_offset,
233 unsigned int plt_offset,
234 unsigned int plt_index)
235 {
236 return this->do_fill_plt_entry(pov, got_address, plt_address,
237 got_offset, plt_offset, plt_index);
238 }
239
240 // Fill in the reserved TLSDESC PLT entry.
241 void
242 fill_tlsdesc_entry(unsigned char* pov,
243 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
244 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
245 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
246 unsigned int tlsdesc_got_offset,
247 unsigned int plt_offset)
248 {
249 this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
250 tlsdesc_got_offset, plt_offset);
251 }
252
253 virtual unsigned int
254 do_get_plt_entry_size() const = 0;
255
256 virtual void
257 do_fill_first_plt_entry(unsigned char* pov,
258 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
259 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
260 = 0;
261
262 virtual unsigned int
263 do_fill_plt_entry(unsigned char* pov,
264 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
265 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
266 unsigned int got_offset,
267 unsigned int plt_offset,
268 unsigned int plt_index) = 0;
269
270 virtual void
271 do_fill_tlsdesc_entry(unsigned char* pov,
272 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
273 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
274 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
275 unsigned int tlsdesc_got_offset,
276 unsigned int plt_offset) = 0;
277
278 virtual void
279 do_add_eh_frame(Layout* layout) = 0;
280
7223e9ca
ILT		 281 void
282 do_adjust_output_section(Output_section* os);
283
284 // Write to a map file.
285 void
286 do_print_to_mapfile(Mapfile* mapfile) const
287 { mapfile->print_output_data(this, _("** PLT")); }
288
2e702c99 289 // The CIE of the .eh_frame unwind information for the PLT.
07a60597 290 static const int plt_eh_frame_cie_size = 16;
07a60597 291 static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
7223e9ca 292
2e702c99 293 private:
7223e9ca
ILT		 294 // Set the final size.
295 void
296 set_final_data_size();
297
298 // Write out the PLT data.
299 void
300 do_write(Output_file*);
301
302 // The reloc section.
303 Reloc_section* rel_;
304 // The TLSDESC relocs, if necessary. These must follow the regular
305 // PLT relocs.
306 Reloc_section* tlsdesc_rel_;
67181c72
ILT		 307 // The IRELATIVE relocs, if necessary. These must follow the
308 // regular PLT relocations and the TLSDESC relocations.
309 Reloc_section* irelative_rel_;
7223e9ca
ILT		 310 // The .got section.
311 Output_data_got<64, false>* got_;
312 // The .got.plt section.
57b2284c 313 Output_data_got_plt_x86_64* got_plt_;
67181c72
ILT		 314 // The part of the .got.plt section used for IRELATIVE relocs.
315 Output_data_space* got_irelative_;
7223e9ca
ILT		 316 // The number of PLT entries.
317 unsigned int count_;
67181c72
ILT		 318 // Number of PLT entries with R_X86_64_IRELATIVE relocs. These
319 // follow the regular PLT entries.
320 unsigned int irelative_count_;
7223e9ca
ILT		 321 // Offset of the reserved TLSDESC_GOT entry when needed.
322 unsigned int tlsdesc_got_offset_;
4829d394
CC		 323 // List of available regions within the section, for incremental
324 // update links.
325 Free_list free_list_;
7223e9ca 326};
2e30d253 327
2e702c99
RM		 328template<int size>
329class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
330{
331 public:
332 Output_data_plt_x86_64_standard(Layout* layout,
333 Output_data_got<64, false>* got,
57b2284c 334 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 335 Output_data_space* got_irelative)
336 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
337 got, got_plt, got_irelative)
338 { }
339
340 Output_data_plt_x86_64_standard(Layout* layout,
341 Output_data_got<64, false>* got,
57b2284c 342 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 343 Output_data_space* got_irelative,
344 unsigned int plt_count)
345 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
346 got, got_plt, got_irelative,
347 plt_count)
348 { }
349
350 protected:
351 virtual unsigned int
352 do_get_plt_entry_size() const
353 { return plt_entry_size; }
354
355 virtual void
356 do_add_eh_frame(Layout* layout)
357 {
358 layout->add_eh_frame_for_plt(this,
359 this->plt_eh_frame_cie,
360 this->plt_eh_frame_cie_size,
361 plt_eh_frame_fde,
362 plt_eh_frame_fde_size);
363 }
364
365 virtual void
366 do_fill_first_plt_entry(unsigned char* pov,
367 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
368 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
369
370 virtual unsigned int
371 do_fill_plt_entry(unsigned char* pov,
372 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
373 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
374 unsigned int got_offset,
375 unsigned int plt_offset,
376 unsigned int plt_index);
377
378 virtual void
379 do_fill_tlsdesc_entry(unsigned char* pov,
380 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
381 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
382 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
383 unsigned int tlsdesc_got_offset,
384 unsigned int plt_offset);
385
386 private:
387 // The size of an entry in the PLT.
388 static const int plt_entry_size = 16;
389
390 // The first entry in the PLT.
391 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
392 // procedure linkage table for both programs and shared objects."
393 static const unsigned char first_plt_entry[plt_entry_size];
394
395 // Other entries in the PLT for an executable.
396 static const unsigned char plt_entry[plt_entry_size];
397
398 // The reserved TLSDESC entry in the PLT for an executable.
399 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
400
401 // The .eh_frame unwind information for the PLT.
402 static const int plt_eh_frame_fde_size = 32;
403 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
404};
405
3a4f096e
ST		 406template<int size>
407class Lazy_view
408{
409 public:
410 Lazy_view(Sized_relobj_file<size, false>* object, unsigned int data_shndx)
411 : object_(object), data_shndx_(data_shndx), view_(NULL), view_size_(0)
412 { }
413
414 inline unsigned char
415 operator[](size_t offset)
416 {
417 if (this->view_ == NULL)
418 this->view_ = this->object_->section_contents(this->data_shndx_,
419 &this->view_size_,
420 true);
421 if (offset >= this->view_size_)
422 return 0;
423 return this->view_[offset];
424 }
425
426 private:
427 Sized_relobj_file<size, false>* object_;
428 unsigned int data_shndx_;
429 const unsigned char* view_;
430 section_size_type view_size_;
431};
432
2e30d253 433// The x86_64 target class.
d61c17ea
ILT		 434// See the ABI at
435// http://www.x86-64.org/documentation/abi.pdf
436// TLS info comes from
437// http://people.redhat.com/drepper/tls.pdf
0ffd9845 438// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
2e30d253 439
fc51264f
L		 440template<int size>
441class Target_x86_64 : public Sized_target<size, false>
2e30d253
ILT		 442{
443 public:
e822f2b1
ILT		 444 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
445 // uses only Elf64_Rela relocation entries with explicit addends."
fc51264f 446 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
2e30d253 447
2e702c99
RM		 448 Target_x86_64(const Target::Target_info* info = &x86_64_info)
449 : Sized_target<size, false>(info),
67181c72
ILT		 450 got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
451 got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
452 rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
43819297 453 got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
e291e7b9 454 tls_base_symbol_defined_(false)
2e30d253
ILT		 455 { }
456
8a5e3e08
ILT		 457 // Hook for a new output section.
458 void
459 do_new_output_section(Output_section*) const;
460
6d03d481
ST		 461 // Scan the relocations to look for symbol adjustments.
462 void
ad0f2072 463 gc_process_relocs(Symbol_table* symtab,
2e702c99
RM		 464 Layout* layout,
465 Sized_relobj_file<size, false>* object,
466 unsigned int data_shndx,
467 unsigned int sh_type,
468 const unsigned char* prelocs,
469 size_t reloc_count,
470 Output_section* output_section,
471 bool needs_special_offset_handling,
472 size_t local_symbol_count,
473 const unsigned char* plocal_symbols);
6d03d481 474
2e30d253
ILT		 475 // Scan the relocations to look for symbol adjustments.
476 void
ad0f2072 477 scan_relocs(Symbol_table* symtab,
2e30d253 478 Layout* layout,
fc51264f 479 Sized_relobj_file<size, false>* object,
2e30d253
ILT		 480 unsigned int data_shndx,
481 unsigned int sh_type,
482 const unsigned char* prelocs,
483 size_t reloc_count,
730cdc88
ILT		 484 Output_section* output_section,
485 bool needs_special_offset_handling,
2e30d253 486 size_t local_symbol_count,
730cdc88 487 const unsigned char* plocal_symbols);
2e30d253
ILT		 488
489 // Finalize the sections.
490 void
f59f41f3 491 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2e30d253 492
4fb6c25d
ILT		 493 // Return the value to use for a dynamic which requires special
494 // treatment.
495 uint64_t
496 do_dynsym_value(const Symbol*) const;
497
2e30d253
ILT		 498 // Relocate a section.
499 void
fc51264f 500 relocate_section(const Relocate_info<size, false>*,
2e30d253
ILT		 501 unsigned int sh_type,
502 const unsigned char* prelocs,
503 size_t reloc_count,
730cdc88
ILT		 504 Output_section* output_section,
505 bool needs_special_offset_handling,
2e30d253 506 unsigned char* view,
fc51264f 507 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
364c7fa5
ILT		 508 section_size_type view_size,
509 const Reloc_symbol_changes*);
2e30d253 510
6a74a719
ILT		 511 // Scan the relocs during a relocatable link.
512 void
ad0f2072 513 scan_relocatable_relocs(Symbol_table* symtab,
6a74a719 514 Layout* layout,
fc51264f 515 Sized_relobj_file<size, false>* object,
6a74a719
ILT		 516 unsigned int data_shndx,
517 unsigned int sh_type,
518 const unsigned char* prelocs,
519 size_t reloc_count,
520 Output_section* output_section,
521 bool needs_special_offset_handling,
522 size_t local_symbol_count,
523 const unsigned char* plocal_symbols,
524 Relocatable_relocs*);
525
4d625b70
CC		 526 // Scan the relocs for --emit-relocs.
527 void
528 emit_relocs_scan(Symbol_table* symtab,
529 Layout* layout,
530 Sized_relobj_file<size, false>* object,
531 unsigned int data_shndx,
532 unsigned int sh_type,
533 const unsigned char* prelocs,
534 size_t reloc_count,
535 Output_section* output_section,
536 bool needs_special_offset_handling,
537 size_t local_symbol_count,
538 const unsigned char* plocal_syms,
539 Relocatable_relocs* rr);
540
7404fe1b 541 // Emit relocations for a section.
6a74a719 542 void
7404fe1b 543 relocate_relocs(
fc51264f
L		 544 const Relocate_info<size, false>*,
545 unsigned int sh_type,
546 const unsigned char* prelocs,
547 size_t reloc_count,
548 Output_section* output_section,
62fe925a 549 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
fc51264f
L		 550 unsigned char* view,
551 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
552 section_size_type view_size,
553 unsigned char* reloc_view,
554 section_size_type reloc_view_size);
6a74a719 555
2e30d253
ILT		 556 // Return a string used to fill a code section with nops.
557 std::string
8851ecca 558 do_code_fill(section_size_type length) const;
2e30d253 559
9a2d6984
ILT		 560 // Return whether SYM is defined by the ABI.
561 bool
9c2d0ef9 562 do_is_defined_by_abi(const Symbol* sym) const
9a2d6984
ILT		 563 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
564
e291e7b9
ILT		 565 // Return the symbol index to use for a target specific relocation.
566 // The only target specific relocation is R_X86_64_TLSDESC for a
567 // local symbol, which is an absolute reloc.
568 unsigned int
569 do_reloc_symbol_index(void*, unsigned int r_type) const
570 {
571 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
572 return 0;
573 }
574
575 // Return the addend to use for a target specific relocation.
576 uint64_t
577 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
578
7223e9ca 579 // Return the PLT section.
67181c72
ILT		 580 uint64_t
581 do_plt_address_for_global(const Symbol* gsym) const
582 { return this->plt_section()->address_for_global(gsym); }
7223e9ca 583
67181c72
ILT		 584 uint64_t
585 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
586 { return this->plt_section()->address_for_local(relobj, symndx); }
7223e9ca 587
b3ce541e
ILT		 588 // This function should be defined in targets that can use relocation
589 // types to determine (implemented in local_reloc_may_be_function_pointer
590 // and global_reloc_may_be_function_pointer)
591 // if a function's pointer is taken. ICF uses this in safe mode to only
592 // fold those functions whose pointer is defintely not taken. For x86_64
593 // pie binaries, safe ICF cannot be done by looking at relocation types.
594 bool
595 do_can_check_for_function_pointers() const
596 { return !parameters->options().pie(); }
597
02d7cd44
ILT		 598 // Return the base for a DW_EH_PE_datarel encoding.
599 uint64_t
600 do_ehframe_datarel_base() const;
601
9b547ce6 602 // Adjust -fsplit-stack code which calls non-split-stack code.
364c7fa5
ILT		 603 void
604 do_calls_non_split(Relobj* object, unsigned int shndx,
605 section_offset_type fnoffset, section_size_type fnsize,
6e0813d3 606 const unsigned char* prelocs, size_t reloc_count,
364c7fa5
ILT		 607 unsigned char* view, section_size_type view_size,
608 std::string* from, std::string* to) const;
609
96f2030e 610 // Return the size of the GOT section.
fe8718a4 611 section_size_type
0e70b911 612 got_size() const
96f2030e
ILT		 613 {
614 gold_assert(this->got_ != NULL);
615 return this->got_->data_size();
616 }
617
0e70b911
CC		 618 // Return the number of entries in the GOT.
619 unsigned int
620 got_entry_count() const
621 {
622 if (this->got_ == NULL)
623 return 0;
624 return this->got_size() / 8;
625 }
626
627 // Return the number of entries in the PLT.
628 unsigned int
629 plt_entry_count() const;
630
631 // Return the offset of the first non-reserved PLT entry.
632 unsigned int
633 first_plt_entry_offset() const;
634
635 // Return the size of each PLT entry.
636 unsigned int
637 plt_entry_size() const;
638
41e83f2b
L		 639 // Return the size of each GOT entry.
640 unsigned int
641 got_entry_size() const
642 { return 8; };
643
4829d394 644 // Create the GOT section for an incremental update.
dd74ae06 645 Output_data_got_base*
4829d394
CC		 646 init_got_plt_for_update(Symbol_table* symtab,
647 Layout* layout,
648 unsigned int got_count,
649 unsigned int plt_count);
650
6fa2a40b
CC		 651 // Reserve a GOT entry for a local symbol, and regenerate any
652 // necessary dynamic relocations.
653 void
654 reserve_local_got_entry(unsigned int got_index,
2e702c99 655 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 656 unsigned int r_sym,
657 unsigned int got_type);
658
659 // Reserve a GOT entry for a global symbol, and regenerate any
660 // necessary dynamic relocations.
661 void
662 reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
663 unsigned int got_type);
664
4829d394 665 // Register an existing PLT entry for a global symbol.
4829d394 666 void
67181c72
ILT		 667 register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
668 Symbol* gsym);
4829d394 669
26d3c67d
CC		 670 // Force a COPY relocation for a given symbol.
671 void
672 emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
673
94a3fc8b
CC		 674 // Apply an incremental relocation.
675 void
fc51264f
L		 676 apply_relocation(const Relocate_info<size, false>* relinfo,
677 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 678 unsigned int r_type,
fc51264f 679 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 680 const Symbol* gsym,
681 unsigned char* view,
fc51264f 682 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 683 section_size_type view_size);
684
e291e7b9
ILT		 685 // Add a new reloc argument, returning the index in the vector.
686 size_t
fc51264f 687 add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
e291e7b9
ILT		 688 {
689 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
690 return this->tlsdesc_reloc_info_.size() - 1;
691 }
692
2e702c99
RM		 693 Output_data_plt_x86_64<size>*
694 make_data_plt(Layout* layout,
695 Output_data_got<64, false>* got,
57b2284c 696 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 697 Output_data_space* got_irelative)
698 {
699 return this->do_make_data_plt(layout, got, got_plt, got_irelative);
700 }
701
702 Output_data_plt_x86_64<size>*
703 make_data_plt(Layout* layout,
704 Output_data_got<64, false>* got,
57b2284c 705 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 706 Output_data_space* got_irelative,
707 unsigned int plt_count)
708 {
709 return this->do_make_data_plt(layout, got, got_plt, got_irelative,
710 plt_count);
711 }
712
713 virtual Output_data_plt_x86_64<size>*
714 do_make_data_plt(Layout* layout,
715 Output_data_got<64, false>* got,
57b2284c 716 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 717 Output_data_space* got_irelative)
718 {
719 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
720 got_irelative);
721 }
722
723 virtual Output_data_plt_x86_64<size>*
724 do_make_data_plt(Layout* layout,
725 Output_data_got<64, false>* got,
57b2284c 726 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 727 Output_data_space* got_irelative,
728 unsigned int plt_count)
729 {
730 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
731 got_irelative,
732 plt_count);
733 }
734
2e30d253
ILT		 735 private:
736 // The class which scans relocations.
a036edd8 737 class Scan
2e30d253 738 {
a036edd8
ILT		 739 public:
740 Scan()
741 : issued_non_pic_error_(false)
742 { }
743
95a2c8d6
RS		 744 static inline int
745 get_reference_flags(unsigned int r_type);
746
2e30d253 747 inline void
ad0f2072 748 local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 749 Sized_relobj_file<size, false>* object,
2e30d253 750 unsigned int data_shndx,
07f397ab 751 Output_section* output_section,
fc51264f 752 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
bfdfa4cd
AM		 753 const elfcpp::Sym<size, false>& lsym,
754 bool is_discarded);
2e30d253
ILT		 755
756 inline void
ad0f2072 757 global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 758 Sized_relobj_file<size, false>* object,
2e30d253 759 unsigned int data_shndx,
07f397ab 760 Output_section* output_section,
fc51264f 761 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
2e30d253 762 Symbol* gsym);
e041f13d 763
21bb3914
ST		 764 inline bool
765 local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
766 Target_x86_64* target,
2e702c99
RM		 767 Sized_relobj_file<size, false>* object,
768 unsigned int data_shndx,
769 Output_section* output_section,
770 const elfcpp::Rela<size, false>& reloc,
21bb3914 771 unsigned int r_type,
2e702c99 772 const elfcpp::Sym<size, false>& lsym);
21bb3914
ST		 773
774 inline bool
775 global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
2e702c99
RM		 776 Target_x86_64* target,
777 Sized_relobj_file<size, false>* object,
778 unsigned int data_shndx,
779 Output_section* output_section,
780 const elfcpp::Rela<size, false>& reloc,
21bb3914 781 unsigned int r_type,
2e702c99 782 Symbol* gsym);
21bb3914 783
a036edd8 784 private:
e041f13d 785 static void
fc51264f
L		 786 unsupported_reloc_local(Sized_relobj_file<size, false>*,
787 unsigned int r_type);
e041f13d
ILT		 788
789 static void
fc51264f
L		 790 unsupported_reloc_global(Sized_relobj_file<size, false>*,
791 unsigned int r_type, Symbol*);
a036edd8
ILT		 792
793 void
a29b0dad 794 check_non_pic(Relobj*, unsigned int r_type, Symbol*);
a036edd8 795
21bb3914
ST		 796 inline bool
797 possible_function_pointer_reloc(unsigned int r_type);
798
7223e9ca 799 bool
fc51264f 800 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
6fa2a40b 801 unsigned int r_type);
7223e9ca 802
a036edd8
ILT		 803 // Whether we have issued an error about a non-PIC compilation.
804 bool issued_non_pic_error_;
2e30d253
ILT		 805 };
806
807 // The class which implements relocation.
808 class Relocate
809 {
810 public:
811 Relocate()
36171d64 812 : skip_call_tls_get_addr_(false)
2e30d253
ILT		 813 { }
814
815 ~Relocate()
816 {
817 if (this->skip_call_tls_get_addr_)
818 {
819 // FIXME: This needs to specify the location somehow.
a0c4fb0a 820 gold_error(_("missing expected TLS relocation"));
2e30d253
ILT		 821 }
822 }
823
824 // Do a relocation. Return false if the caller should not issue
825 // any warnings about this relocation.
826 inline bool
91a65d2f
AM		 827 relocate(const Relocate_info<size, false>*, unsigned int,
828 Target_x86_64*, Output_section*, size_t, const unsigned char*,
829 const Sized_symbol<size>*, const Symbol_value<size>*,
fc51264f 830 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 831 section_size_type);
2e30d253
ILT		 832
833 private:
834 // Do a TLS relocation.
835 inline void
fc51264f 836 relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
2e702c99 837 size_t relnum, const elfcpp::Rela<size, false>&,
fc51264f
L		 838 unsigned int r_type, const Sized_symbol<size>*,
839 const Symbol_value<size>*,
840 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 841 section_size_type);
2e30d253 842
c2b45e22 843 // Do a TLS General-Dynamic to Initial-Exec transition.
7bf1f802 844 inline void
fc51264f 845 tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
fc51264f
L		 846 const elfcpp::Rela<size, false>&, unsigned int r_type,
847 typename elfcpp::Elf_types<size>::Elf_Addr value,
7bf1f802 848 unsigned char* view,
fc51264f 849 typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 850 section_size_type view_size);
7bf1f802 851
56622147
ILT		 852 // Do a TLS General-Dynamic to Local-Exec transition.
853 inline void
fc51264f 854 tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 855 Output_segment* tls_segment,
fc51264f
L		 856 const elfcpp::Rela<size, false>&, unsigned int r_type,
857 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 858 unsigned char* view,
fe8718a4 859 section_size_type view_size);
2e30d253 860
c2b45e22
CC		 861 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
862 inline void
fc51264f 863 tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
fc51264f
L		 864 const elfcpp::Rela<size, false>&, unsigned int r_type,
865 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 866 unsigned char* view,
fc51264f 867 typename elfcpp::Elf_types<size>::Elf_Addr,
c2b45e22
CC		 868 section_size_type view_size);
869
870 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
871 inline void
fc51264f 872 tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
c2b45e22 873 Output_segment* tls_segment,
fc51264f
L		 874 const elfcpp::Rela<size, false>&, unsigned int r_type,
875 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 876 unsigned char* view,
877 section_size_type view_size);
878
56622147 879 // Do a TLS Local-Dynamic to Local-Exec transition.
2e30d253 880 inline void
fc51264f 881 tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 882 Output_segment* tls_segment,
fc51264f
L		 883 const elfcpp::Rela<size, false>&, unsigned int r_type,
884 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 885 unsigned char* view,
fe8718a4 886 section_size_type view_size);
2e30d253 887
56622147
ILT		 888 // Do a TLS Initial-Exec to Local-Exec transition.
889 static inline void
fc51264f 890 tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
72ec2876 891 Output_segment* tls_segment,
fc51264f
L		 892 const elfcpp::Rela<size, false>&, unsigned int r_type,
893 typename elfcpp::Elf_types<size>::Elf_Addr value,
72ec2876 894 unsigned char* view,
fe8718a4 895 section_size_type view_size);
2e30d253
ILT		 896
897 // This is set if we should skip the next reloc, which should be a
898 // PLT32 reloc against ___tls_get_addr.
899 bool skip_call_tls_get_addr_;
900 };
901
1fa29f10
IT		 902 // Check if relocation against this symbol is a candidate for
903 // conversion from
904 // mov foo@GOTPCREL(%rip), %reg
905 // to lea foo(%rip), %reg.
3a4f096e
ST		 906 template<class View_type>
907 static inline bool
908 can_convert_mov_to_lea(const Symbol* gsym, unsigned int r_type,
909 size_t r_offset, View_type* view)
1fa29f10
IT		 910 {
911 gold_assert(gsym != NULL);
3a4f096e
ST		 912 // We cannot do the conversion unless it's one of these relocations.
913 if (r_type != elfcpp::R_X86_64_GOTPCREL
914 && r_type != elfcpp::R_X86_64_GOTPCRELX
915 && r_type != elfcpp::R_X86_64_REX_GOTPCRELX)
916 return false;
917 // We cannot convert references to IFUNC symbols, or to symbols that
918 // are not local to the current module.
919 if (gsym->type() == elfcpp::STT_GNU_IFUNC
920 || gsym->is_undefined ()
921 || gsym->is_from_dynobj()
922 || gsym->is_preemptible())
923 return false;
924 // If we are building a shared object and the symbol is protected, we may
925 // need to go through the GOT.
926 if (parameters->options().shared()
927 && gsym->visibility() == elfcpp::STV_PROTECTED)
928 return false;
929 // We cannot convert references to the _DYNAMIC symbol.
930 if (strcmp(gsym->name(), "_DYNAMIC") == 0)
931 return false;
932 // Check for a MOV opcode.
933 return (*view)[r_offset - 2] == 0x8b;
934 }
935
936 // Convert
937 // callq *foo@GOTPCRELX(%rip) to
938 // addr32 callq foo
939 // and jmpq *foo@GOTPCRELX(%rip) to
940 // jmpq foo
941 // nop
942 template<class View_type>
943 static inline bool
944 can_convert_callq_to_direct(const Symbol* gsym, unsigned int r_type,
945 size_t r_offset, View_type* view)
946 {
947 gold_assert(gsym != NULL);
948 // We cannot do the conversion unless it's a GOTPCRELX relocation.
949 if (r_type != elfcpp::R_X86_64_GOTPCRELX)
950 return false;
951 // We cannot convert references to IFUNC symbols, or to symbols that
952 // are not local to the current module.
953 if (gsym->type() == elfcpp::STT_GNU_IFUNC
954 || gsym->is_undefined ()
955 || gsym->is_from_dynobj()
956 || gsym->is_preemptible())
957 return false;
958 // Check for a CALLQ or JMPQ opcode.
959 return ((*view)[r_offset - 2] == 0xff
960 && ((*view)[r_offset - 1] == 0x15
961 || (*view)[r_offset - 1] == 0x25));
1fa29f10
IT		 962 }
963
2e30d253
ILT		 964 // Adjust TLS relocation type based on the options and whether this
965 // is a local symbol.
e041f13d 966 static tls::Tls_optimization
2e30d253
ILT		 967 optimize_tls_reloc(bool is_final, int r_type);
968
969 // Get the GOT section, creating it if necessary.
970 Output_data_got<64, false>*
971 got_section(Symbol_table*, Layout*);
972
96f2030e 973 // Get the GOT PLT section.
57b2284c 974 Output_data_got_plt_x86_64*
96f2030e
ILT		 975 got_plt_section() const
976 {
977 gold_assert(this->got_plt_ != NULL);
978 return this->got_plt_;
979 }
980
a8df5856
ILT		 981 // Get the GOT section for TLSDESC entries.
982 Output_data_got<64, false>*
983 got_tlsdesc_section() const
984 {
985 gold_assert(this->got_tlsdesc_ != NULL);
986 return this->got_tlsdesc_;
987 }
988
c2b45e22
CC		 989 // Create the PLT section.
990 void
991 make_plt_section(Symbol_table* symtab, Layout* layout);
992
2e30d253
ILT		 993 // Create a PLT entry for a global symbol.
994 void
995 make_plt_entry(Symbol_table*, Layout*, Symbol*);
996
7223e9ca
ILT		 997 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
998 void
999 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
fc51264f 1000 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 1001 unsigned int local_sym_index);
1002
9fa33bee 1003 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 1004 void
1005 define_tls_base_symbol(Symbol_table*, Layout*);
1006
c2b45e22
CC		 1007 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
1008 void
1009 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
1010
31d60480
ILT		 1011 // Create a GOT entry for the TLS module index.
1012 unsigned int
1013 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
fc51264f 1014 Sized_relobj_file<size, false>* object);
31d60480 1015
2e30d253 1016 // Get the PLT section.
fc51264f 1017 Output_data_plt_x86_64<size>*
2e30d253
ILT		 1018 plt_section() const
1019 {
1020 gold_assert(this->plt_ != NULL);
1021 return this->plt_;
1022 }
1023
1024 // Get the dynamic reloc section, creating it if necessary.
1025 Reloc_section*
0ffd9845 1026 rela_dyn_section(Layout*);
2e30d253 1027
e291e7b9
ILT		 1028 // Get the section to use for TLSDESC relocations.
1029 Reloc_section*
1030 rela_tlsdesc_section(Layout*) const;
1031
67181c72
ILT		 1032 // Get the section to use for IRELATIVE relocations.
1033 Reloc_section*
1034 rela_irelative_section(Layout*);
1035
12c0daef 1036 // Add a potential copy relocation.
2e30d253 1037 void
ef9beddf 1038 copy_reloc(Symbol_table* symtab, Layout* layout,
2e702c99 1039 Sized_relobj_file<size, false>* object,
12c0daef 1040 unsigned int shndx, Output_section* output_section,
fc51264f 1041 Symbol* sym, const elfcpp::Rela<size, false>& reloc)
12c0daef 1042 {
859d7987 1043 unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
12c0daef 1044 this->copy_relocs_.copy_reloc(symtab, layout,
fc51264f 1045 symtab->get_sized_symbol<size>(sym),
12c0daef 1046 object, shndx, output_section,
859d7987
CC		 1047 r_type, reloc.get_r_offset(),
1048 reloc.get_r_addend(),
1049 this->rela_dyn_section(layout));
12c0daef 1050 }
2e30d253
ILT		 1051
1052 // Information about this specific target which we pass to the
1053 // general Target structure.
1054 static const Target::Target_info x86_64_info;
1055
0e70b911
CC		 1056 // The types of GOT entries needed for this platform.
1057 // These values are exposed to the ABI in an incremental link.
1058 // Do not renumber existing values without changing the version
1059 // number of the .gnu_incremental_inputs section.
0a65a3a7
CC		 1060 enum Got_type
1061 {
1062 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
1063 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
1064 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
1065 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
1066 };
1067
e291e7b9
ILT		 1068 // This type is used as the argument to the target specific
1069 // relocation routines. The only target specific reloc is
1070 // R_X86_64_TLSDESC against a local symbol.
1071 struct Tlsdesc_info
1072 {
fc51264f 1073 Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
e291e7b9
ILT		 1074 : object(a_object), r_sym(a_r_sym)
1075 { }
1076
1077 // The object in which the local symbol is defined.
fc51264f 1078 Sized_relobj_file<size, false>* object;
e291e7b9
ILT		 1079 // The local symbol index in the object.
1080 unsigned int r_sym;
1081 };
1082
2e30d253
ILT		 1083 // The GOT section.
1084 Output_data_got<64, false>* got_;
1085 // The PLT section.
fc51264f 1086 Output_data_plt_x86_64<size>* plt_;
2e30d253 1087 // The GOT PLT section.
57b2284c 1088 Output_data_got_plt_x86_64* got_plt_;
67181c72
ILT		 1089 // The GOT section for IRELATIVE relocations.
1090 Output_data_space* got_irelative_;
a8df5856
ILT		 1091 // The GOT section for TLSDESC relocations.
1092 Output_data_got<64, false>* got_tlsdesc_;
e785ec03
ILT		 1093 // The _GLOBAL_OFFSET_TABLE_ symbol.
1094 Symbol* global_offset_table_;
2e30d253 1095 // The dynamic reloc section.
0ffd9845 1096 Reloc_section* rela_dyn_;
67181c72
ILT		 1097 // The section to use for IRELATIVE relocs.
1098 Reloc_section* rela_irelative_;
2e30d253 1099 // Relocs saved to avoid a COPY reloc.
fc51264f 1100 Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
c2b45e22 1101 // Offset of the GOT entry for the TLS module index.
31d60480 1102 unsigned int got_mod_index_offset_;
e291e7b9
ILT		 1103 // We handle R_X86_64_TLSDESC against a local symbol as a target
1104 // specific relocation. Here we store the object and local symbol
1105 // index for the relocation.
1106 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
edfbb029
CC		 1107 // True if the _TLS_MODULE_BASE_ symbol has been defined.
1108 bool tls_base_symbol_defined_;
2e30d253
ILT		 1109};
1110
fc51264f
L		 1111template<>
1112const Target::Target_info Target_x86_64<64>::x86_64_info =
2e30d253
ILT		 1113{
1114 64, // size
1115 false, // is_big_endian
1116 elfcpp::EM_X86_64, // machine_code
1117 false, // has_make_symbol
1118 false, // has_resolve
1119 true, // has_code_fill
35cdfc9a 1120 true, // is_default_stack_executable
b3ce541e 1121 true, // can_icf_inline_merge_sections
0864d551 1122 '\0', // wrap_char
2e30d253 1123 "/lib/ld64.so.1", // program interpreter
0c5e9c22 1124 0x400000, // default_text_segment_address
cd72c291 1125 0x1000, // abi_pagesize (overridable by -z max-page-size)
8a5e3e08 1126 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1127 false, // isolate_execinstr
1128 0, // rosegment_gap
8a5e3e08
ILT		 1129 elfcpp::SHN_UNDEF, // small_common_shndx
1130 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1131 0, // small_common_section_flags
05a352e6
DK		 1132 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1133 NULL, // attributes_section
a67858e0 1134 NULL, // attributes_vendor
8d9743bd
MK		 1135 "_start", // entry_symbol_name
1136 32, // hash_entry_size
2e30d253
ILT		 1137};
1138
fc51264f
L		 1139template<>
1140const Target::Target_info Target_x86_64<32>::x86_64_info =
1141{
1142 32, // size
1143 false, // is_big_endian
1144 elfcpp::EM_X86_64, // machine_code
1145 false, // has_make_symbol
1146 false, // has_resolve
1147 true, // has_code_fill
1148 true, // is_default_stack_executable
1149 true, // can_icf_inline_merge_sections
1150 '\0', // wrap_char
1151 "/libx32/ldx32.so.1", // program interpreter
1152 0x400000, // default_text_segment_address
1153 0x1000, // abi_pagesize (overridable by -z max-page-size)
1154 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1155 false, // isolate_execinstr
1156 0, // rosegment_gap
fc51264f
L		 1157 elfcpp::SHN_UNDEF, // small_common_shndx
1158 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1159 0, // small_common_section_flags
1160 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1161 NULL, // attributes_section
a67858e0 1162 NULL, // attributes_vendor
8d9743bd
MK		 1163 "_start", // entry_symbol_name
1164 32, // hash_entry_size
fc51264f
L		 1165};
1166
8a5e3e08
ILT		 1167// This is called when a new output section is created. This is where
1168// we handle the SHF_X86_64_LARGE.
1169
fc51264f 1170template<int size>
8a5e3e08 1171void
fc51264f 1172Target_x86_64<size>::do_new_output_section(Output_section* os) const
8a5e3e08
ILT		 1173{
1174 if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1175 os->set_is_large_section();
1176}
1177
2e30d253
ILT		 1178// Get the GOT section, creating it if necessary.
1179
fc51264f 1180template<int size>
2e30d253 1181Output_data_got<64, false>*
fc51264f 1182Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
2e30d253
ILT		 1183{
1184 if (this->got_ == NULL)
1185 {
1186 gold_assert(symtab != NULL && layout != NULL);
1187
9446efde
ILT		 1188 // When using -z now, we can treat .got.plt as a relro section.
1189 // Without -z now, it is modified after program startup by lazy
1190 // PLT relocations.
1191 bool is_got_plt_relro = parameters->options().now();
1192 Output_section_order got_order = (is_got_plt_relro
1193 ? ORDER_RELRO
1194 : ORDER_RELRO_LAST);
1195 Output_section_order got_plt_order = (is_got_plt_relro
1196 ? ORDER_RELRO
1197 : ORDER_NON_RELRO_FIRST);
1198
2e30d253
ILT		 1199 this->got_ = new Output_data_got<64, false>();
1200
82742395
ILT		 1201 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1202 (elfcpp::SHF_ALLOC
1203 | elfcpp::SHF_WRITE),
9446efde 1204 this->got_, got_order, true);
2e30d253 1205
57b2284c 1206 this->got_plt_ = new Output_data_got_plt_x86_64(layout);
82742395
ILT		 1207 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1208 (elfcpp::SHF_ALLOC
1209 | elfcpp::SHF_WRITE),
9446efde
ILT		 1210 this->got_plt_, got_plt_order,
1211 is_got_plt_relro);
2e30d253
ILT		 1212
1213 // The first three entries are reserved.
27bc2bce 1214 this->got_plt_->set_current_data_size(3 * 8);
2e30d253 1215
9446efde
ILT		 1216 if (!is_got_plt_relro)
1217 {
1218 // Those bytes can go into the relro segment.
1219 layout->increase_relro(3 * 8);
1220 }
1a2dff53 1221
2e30d253 1222 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
e785ec03
ILT		 1223 this->global_offset_table_ =
1224 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1225 Symbol_table::PREDEFINED,
1226 this->got_plt_,
1227 0, 0, elfcpp::STT_OBJECT,
1228 elfcpp::STB_LOCAL,
1229 elfcpp::STV_HIDDEN, 0,
1230 false, false);
a8df5856 1231
67181c72
ILT		 1232 // If there are any IRELATIVE relocations, they get GOT entries
1233 // in .got.plt after the jump slot entries.
1234 this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1235 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1236 (elfcpp::SHF_ALLOC
1237 | elfcpp::SHF_WRITE),
1238 this->got_irelative_,
9446efde 1239 got_plt_order, is_got_plt_relro);
67181c72 1240
a8df5856 1241 // If there are any TLSDESC relocations, they get GOT entries in
67181c72 1242 // .got.plt after the jump slot and IRELATIVE entries.
a8df5856
ILT		 1243 this->got_tlsdesc_ = new Output_data_got<64, false>();
1244 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1245 (elfcpp::SHF_ALLOC
1246 | elfcpp::SHF_WRITE),
22f0da72 1247 this->got_tlsdesc_,
9446efde 1248 got_plt_order, is_got_plt_relro);
2e30d253
ILT		 1249 }
1250
1251 return this->got_;
1252}
1253
1254// Get the dynamic reloc section, creating it if necessary.
1255
fc51264f
L		 1256template<int size>
1257typename Target_x86_64<size>::Reloc_section*
1258Target_x86_64<size>::rela_dyn_section(Layout* layout)
2e30d253 1259{
0ffd9845 1260 if (this->rela_dyn_ == NULL)
2e30d253
ILT		 1261 {
1262 gold_assert(layout != NULL);
d98bc257 1263 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
2e30d253 1264 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
22f0da72
ILT		 1265 elfcpp::SHF_ALLOC, this->rela_dyn_,
1266 ORDER_DYNAMIC_RELOCS, false);
2e30d253 1267 }
0ffd9845 1268 return this->rela_dyn_;
2e30d253
ILT		 1269}
1270
67181c72
ILT		 1271// Get the section to use for IRELATIVE relocs, creating it if
1272// necessary. These go in .rela.dyn, but only after all other dynamic
1273// relocations. They need to follow the other dynamic relocations so
1274// that they can refer to global variables initialized by those
1275// relocs.
1276
fc51264f
L		 1277template<int size>
1278typename Target_x86_64<size>::Reloc_section*
1279Target_x86_64<size>::rela_irelative_section(Layout* layout)
67181c72
ILT		 1280{
1281 if (this->rela_irelative_ == NULL)
1282 {
1283 // Make sure we have already created the dynamic reloc section.
1284 this->rela_dyn_section(layout);
1285 this->rela_irelative_ = new Reloc_section(false);
1286 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1287 elfcpp::SHF_ALLOC, this->rela_irelative_,
1288 ORDER_DYNAMIC_RELOCS, false);
1289 gold_assert(this->rela_dyn_->output_section()
1290 == this->rela_irelative_->output_section());
1291 }
1292 return this->rela_irelative_;
1293}
1294
57b2284c
CC		 1295// Write the first three reserved words of the .got.plt section.
1296// The remainder of the section is written while writing the PLT
1297// in Output_data_plt_i386::do_write.
1298
1299void
1300Output_data_got_plt_x86_64::do_write(Output_file* of)
1301{
1302 // The first entry in the GOT is the address of the .dynamic section
1303 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1304 // We saved space for them when we created the section in
1305 // Target_x86_64::got_section.
1306 const off_t got_file_offset = this->offset();
1307 gold_assert(this->data_size() >= 24);
1308 unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
1309 Output_section* dynamic = this->layout_->dynamic_section();
1310 uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1311 elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
1312 memset(got_view + 8, 0, 16);
1313 of->write_output_view(got_file_offset, 24, got_view);
1314}
1315
4829d394 1316// Initialize the PLT section.
2e30d253 1317
fc51264f 1318template<int size>
4829d394 1319void
fc51264f 1320Output_data_plt_x86_64<size>::init(Layout* layout)
2e30d253 1321{
d98bc257 1322 this->rel_ = new Reloc_section(false);
2e30d253 1323 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
22f0da72
ILT		 1324 elfcpp::SHF_ALLOC, this->rel_,
1325 ORDER_DYNAMIC_PLT_RELOCS, false);
2e30d253
ILT		 1326}
1327
fc51264f 1328template<int size>
2e30d253 1329void
fc51264f 1330Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
2e30d253 1331{
2e702c99 1332 os->set_entsize(this->get_plt_entry_size());
2e30d253
ILT		 1333}
1334
1335// Add an entry to the PLT.
1336
fc51264f 1337template<int size>
2e30d253 1338void
fc51264f
L		 1339Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1340 Symbol* gsym)
2e30d253
ILT		 1341{
1342 gold_assert(!gsym->has_plt_offset());
1343
4829d394
CC		 1344 unsigned int plt_index;
1345 off_t plt_offset;
1346 section_offset_type got_offset;
2e30d253 1347
67181c72
ILT		 1348 unsigned int* pcount;
1349 unsigned int offset;
1350 unsigned int reserved;
57b2284c 1351 Output_section_data_build* got;
67181c72
ILT		 1352 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1353 && gsym->can_use_relative_reloc(false))
1354 {
1355 pcount = &this->irelative_count_;
1356 offset = 0;
1357 reserved = 0;
1358 got = this->got_irelative_;
1359 }
1360 else
1361 {
1362 pcount = &this->count_;
1363 offset = 1;
1364 reserved = 3;
1365 got = this->got_plt_;
1366 }
1367
4829d394
CC		 1368 if (!this->is_data_size_valid())
1369 {
67181c72
ILT		 1370 // Note that when setting the PLT offset for a non-IRELATIVE
1371 // entry we skip the initial reserved PLT entry.
1372 plt_index = *pcount + offset;
2e702c99 1373 plt_offset = plt_index * this->get_plt_entry_size();
2e30d253 1374
67181c72 1375 ++*pcount;
2e30d253 1376
67181c72
ILT		 1377 got_offset = (plt_index - offset + reserved) * 8;
1378 gold_assert(got_offset == got->current_data_size());
2e30d253 1379
4829d394
CC		 1380 // Every PLT entry needs a GOT entry which points back to the PLT
1381 // entry (this will be changed by the dynamic linker, normally
1382 // lazily when the function is called).
67181c72 1383 got->set_current_data_size(got_offset + 8);
4829d394 1384 }
7223e9ca
ILT		 1385 else
1386 {
67181c72
ILT		 1387 // FIXME: This is probably not correct for IRELATIVE relocs.
1388
4829d394 1389 // For incremental updates, find an available slot.
2e702c99
RM		 1390 plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1391 this->get_plt_entry_size(), 0);
4829d394 1392 if (plt_offset == -1)
e6455dfb
CC		 1393 gold_fallback(_("out of patch space (PLT);"
1394 " relink with --incremental-full"));
4829d394
CC		 1395
1396 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1397 // can be calculated from the PLT index, adjusting for the three
1398 // reserved entries at the beginning of the GOT.
2e702c99 1399 plt_index = plt_offset / this->get_plt_entry_size() - 1;
67181c72 1400 got_offset = (plt_index - offset + reserved) * 8;
7223e9ca 1401 }
2e30d253 1402
4829d394
CC		 1403 gsym->set_plt_offset(plt_offset);
1404
1405 // Every PLT entry needs a reloc.
67181c72 1406 this->add_relocation(symtab, layout, gsym, got_offset);
4829d394 1407
2e30d253
ILT		 1408 // Note that we don't need to save the symbol. The contents of the
1409 // PLT are independent of which symbols are used. The symbols only
1410 // appear in the relocations.
1411}
1412
7223e9ca
ILT		 1413// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1414// the PLT offset.
1415
fc51264f 1416template<int size>
7223e9ca 1417unsigned int
fc51264f 1418Output_data_plt_x86_64<size>::add_local_ifunc_entry(
67181c72
ILT		 1419 Symbol_table* symtab,
1420 Layout* layout,
fc51264f 1421 Sized_relobj_file<size, false>* relobj,
6fa2a40b 1422 unsigned int local_sym_index)
7223e9ca 1423{
2e702c99 1424 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
67181c72 1425 ++this->irelative_count_;
7223e9ca 1426
67181c72 1427 section_offset_type got_offset = this->got_irelative_->current_data_size();
7223e9ca
ILT		 1428
1429 // Every PLT entry needs a GOT entry which points back to the PLT
1430 // entry.
67181c72 1431 this->got_irelative_->set_current_data_size(got_offset + 8);
7223e9ca
ILT		 1432
1433 // Every PLT entry needs a reloc.
67181c72
ILT		 1434 Reloc_section* rela = this->rela_irelative(symtab, layout);
1435 rela->add_symbolless_local_addend(relobj, local_sym_index,
1436 elfcpp::R_X86_64_IRELATIVE,
1437 this->got_irelative_, got_offset, 0);
7223e9ca
ILT		 1438
1439 return plt_offset;
1440}
1441
4829d394
CC		 1442// Add the relocation for a PLT entry.
1443
fc51264f 1444template<int size>
4829d394 1445void
fc51264f
L		 1446Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1447 Layout* layout,
1448 Symbol* gsym,
1449 unsigned int got_offset)
4829d394
CC		 1450{
1451 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1452 && gsym->can_use_relative_reloc(false))
67181c72
ILT		 1453 {
1454 Reloc_section* rela = this->rela_irelative(symtab, layout);
1455 rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1456 this->got_irelative_, got_offset, 0);
1457 }
4829d394
CC		 1458 else
1459 {
1460 gsym->set_needs_dynsym_entry();
1461 this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1462 got_offset, 0);
1463 }
1464}
1465
e291e7b9
ILT		 1466// Return where the TLSDESC relocations should go, creating it if
1467// necessary. These follow the JUMP_SLOT relocations.
1468
fc51264f
L		 1469template<int size>
1470typename Output_data_plt_x86_64<size>::Reloc_section*
1471Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
e291e7b9
ILT		 1472{
1473 if (this->tlsdesc_rel_ == NULL)
1474 {
1475 this->tlsdesc_rel_ = new Reloc_section(false);
1476 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1477 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
22f0da72 1478 ORDER_DYNAMIC_PLT_RELOCS, false);
67181c72
ILT		 1479 gold_assert(this->tlsdesc_rel_->output_section()
1480 == this->rel_->output_section());
e291e7b9
ILT		 1481 }
1482 return this->tlsdesc_rel_;
1483}
1484
67181c72
ILT		 1485// Return where the IRELATIVE relocations should go in the PLT. These
1486// follow the JUMP_SLOT and the TLSDESC relocations.
1487
fc51264f
L		 1488template<int size>
1489typename Output_data_plt_x86_64<size>::Reloc_section*
1490Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1491 Layout* layout)
67181c72
ILT		 1492{
1493 if (this->irelative_rel_ == NULL)
1494 {
1495 // Make sure we have a place for the TLSDESC relocations, in
1496 // case we see any later on.
1497 this->rela_tlsdesc(layout);
1498 this->irelative_rel_ = new Reloc_section(false);
1499 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1500 elfcpp::SHF_ALLOC, this->irelative_rel_,
1501 ORDER_DYNAMIC_PLT_RELOCS, false);
1502 gold_assert(this->irelative_rel_->output_section()
1503 == this->rel_->output_section());
1504
1505 if (parameters->doing_static_link())
1506 {
1507 // A statically linked executable will only have a .rela.plt
1508 // section to hold R_X86_64_IRELATIVE relocs for
1509 // STT_GNU_IFUNC symbols. The library will use these
1510 // symbols to locate the IRELATIVE relocs at program startup
1511 // time.
1512 symtab->define_in_output_data("__rela_iplt_start", NULL,
1513 Symbol_table::PREDEFINED,
1514 this->irelative_rel_, 0, 0,
1515 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1516 elfcpp::STV_HIDDEN, 0, false, true);
1517 symtab->define_in_output_data("__rela_iplt_end", NULL,
1518 Symbol_table::PREDEFINED,
1519 this->irelative_rel_, 0, 0,
1520 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1521 elfcpp::STV_HIDDEN, 0, true, true);
1522 }
1523 }
1524 return this->irelative_rel_;
1525}
1526
1527// Return the PLT address to use for a global symbol.
1528
fc51264f 1529template<int size>
67181c72 1530uint64_t
fc51264f 1531Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym)
67181c72
ILT		 1532{
1533 uint64_t offset = 0;
1534 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1535 && gsym->can_use_relative_reloc(false))
2e702c99 1536 offset = (this->count_ + 1) * this->get_plt_entry_size();
19fec8c1 1537 return this->address() + offset + gsym->plt_offset();
67181c72
ILT		 1538}
1539
1540// Return the PLT address to use for a local symbol. These are always
1541// IRELATIVE relocs.
1542
fc51264f 1543template<int size>
67181c72 1544uint64_t
19fec8c1
AM		 1545Output_data_plt_x86_64<size>::address_for_local(const Relobj* object,
1546 unsigned int r_sym)
67181c72 1547{
19fec8c1
AM		 1548 return (this->address()
1549 + (this->count_ + 1) * this->get_plt_entry_size()
1550 + object->local_plt_offset(r_sym));
67181c72
ILT		 1551}
1552
c2b45e22 1553// Set the final size.
fc51264f 1554template<int size>
c2b45e22 1555void
fc51264f 1556Output_data_plt_x86_64<size>::set_final_data_size()
c2b45e22 1557{
67181c72 1558 unsigned int count = this->count_ + this->irelative_count_;
c2b45e22
CC		 1559 if (this->has_tlsdesc_entry())
1560 ++count;
2e702c99 1561 this->set_data_size((count + 1) * this->get_plt_entry_size());
c2b45e22
CC		 1562}
1563
2e30d253
ILT		 1564// The first entry in the PLT for an executable.
1565
fc51264f
L		 1566template<int size>
1567const unsigned char
2e702c99 1568Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
2e30d253
ILT		 1569{
1570 // From AMD64 ABI Draft 0.98, page 76
1571 0xff, 0x35, // pushq contents of memory address
2e30d253 1572 0, 0, 0, 0, // replaced with address of .got + 8
78d911fd
ILT		 1573 0xff, 0x25, // jmp indirect
1574 0, 0, 0, 0, // replaced with address of .got + 16
2e30d253
ILT		 1575 0x90, 0x90, 0x90, 0x90 // noop (x4)
1576};
1577
2e702c99
RM		 1578template<int size>
1579void
1580Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1581 unsigned char* pov,
1582 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1583 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1584{
1585 memcpy(pov, first_plt_entry, plt_entry_size);
1586 // We do a jmp relative to the PC at the end of this instruction.
1587 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1588 (got_address + 8
1589 - (plt_address + 6)));
1590 elfcpp::Swap<32, false>::writeval(pov + 8,
1591 (got_address + 16
1592 - (plt_address + 12)));
1593}
1594
2e30d253
ILT		 1595// Subsequent entries in the PLT for an executable.
1596
fc51264f
L		 1597template<int size>
1598const unsigned char
2e702c99 1599Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
2e30d253
ILT		 1600{
1601 // From AMD64 ABI Draft 0.98, page 76
1602 0xff, 0x25, // jmpq indirect
1603 0, 0, 0, 0, // replaced with address of symbol in .got
1604 0x68, // pushq immediate
1605 0, 0, 0, 0, // replaced with offset into relocation table
1606 0xe9, // jmpq relative
1607 0, 0, 0, 0 // replaced with offset to start of .plt
1608};
1609
2e702c99
RM		 1610template<int size>
1611unsigned int
1612Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
1613 unsigned char* pov,
1614 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1615 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1616 unsigned int got_offset,
1617 unsigned int plt_offset,
1618 unsigned int plt_index)
1619{
9d585188
L		 1620 // Check PC-relative offset overflow in PLT entry.
1621 uint64_t plt_got_pcrel_offset = (got_address + got_offset
1622 - (plt_address + plt_offset + 6));
1623 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
1624 gold_error(_("PC-relative offset overflow in PLT entry %d"),
1625 plt_index + 1);
1626
2e702c99
RM		 1627 memcpy(pov, plt_entry, plt_entry_size);
1628 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
9d585188 1629 plt_got_pcrel_offset);
2e702c99
RM		 1630
1631 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
1632 elfcpp::Swap<32, false>::writeval(pov + 12,
1633 - (plt_offset + plt_entry_size));
1634
1635 return 6;
1636}
1637
c2b45e22
CC		 1638// The reserved TLSDESC entry in the PLT for an executable.
1639
fc51264f
L		 1640template<int size>
1641const unsigned char
2e702c99 1642Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
c2b45e22
CC		 1643{
1644 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1645 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1646 0xff, 0x35, // pushq x(%rip)
1647 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1648 0xff, 0x25, // jmpq *y(%rip)
1649 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
1650 0x0f, 0x1f, // nop
1651 0x40, 0
1652};
1653
2e702c99
RM		 1654template<int size>
1655void
1656Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
1657 unsigned char* pov,
1658 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1659 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1660 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
1661 unsigned int tlsdesc_got_offset,
1662 unsigned int plt_offset)
1663{
1664 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
1665 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1666 (got_address + 8
1667 - (plt_address + plt_offset
1668 + 6)));
1669 elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
1670 (got_base
1671 + tlsdesc_got_offset
1672 - (plt_address + plt_offset
1673 + 12)));
1674}
1675
07a60597
ILT		 1676// The .eh_frame unwind information for the PLT.
1677
fc51264f 1678template<int size>
2e702c99 1679const unsigned char
fc51264f 1680Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
07a60597
ILT		 1681{
1682 1, // CIE version.
1683 'z', // Augmentation: augmentation size included.
1684 'R', // Augmentation: FDE encoding included.
1685 '\0', // End of augmentation string.
1686 1, // Code alignment factor.
1687 0x78, // Data alignment factor.
1688 16, // Return address column.
1689 1, // Augmentation size.
1690 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
1691 | elfcpp::DW_EH_PE_sdata4),
1692 elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1693 elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1694 elfcpp::DW_CFA_nop, // Align to 16 bytes.
1695 elfcpp::DW_CFA_nop
1696};
1697
fc51264f 1698template<int size>
07a60597 1699const unsigned char
2e702c99 1700Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
07a60597
ILT		 1701{
1702 0, 0, 0, 0, // Replaced with offset to .plt.
1703 0, 0, 0, 0, // Replaced with size of .plt.
1704 0, // Augmentation size.
1705 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
1706 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
1707 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
1708 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
1709 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
1710 11, // Block length.
1711 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
1712 elfcpp::DW_OP_breg16, 0, // Push %rip.
1713 elfcpp::DW_OP_lit15, // Push 0xf.
1714 elfcpp::DW_OP_and, // & (%rip & 0xf).
1715 elfcpp::DW_OP_lit11, // Push 0xb.
1716 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
1717 elfcpp::DW_OP_lit3, // Push 3.
1718 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
1719 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1720 elfcpp::DW_CFA_nop, // Align to 32 bytes.
1721 elfcpp::DW_CFA_nop,
1722 elfcpp::DW_CFA_nop,
1723 elfcpp::DW_CFA_nop
1724};
1725
2e30d253
ILT		 1726// Write out the PLT. This uses the hand-coded instructions above,
1727// and adjusts them as needed. This is specified by the AMD64 ABI.
1728
fc51264f 1729template<int size>
2e30d253 1730void
fc51264f 1731Output_data_plt_x86_64<size>::do_write(Output_file* of)
2e30d253 1732{
2ea97941 1733 const off_t offset = this->offset();
fe8718a4
ILT		 1734 const section_size_type oview_size =
1735 convert_to_section_size_type(this->data_size());
2ea97941 1736 unsigned char* const oview = of->get_output_view(offset, oview_size);
2e30d253
ILT		 1737
1738 const off_t got_file_offset = this->got_plt_->offset();
67181c72
ILT		 1739 gold_assert(parameters->incremental_update()
1740 || (got_file_offset + this->got_plt_->data_size()
1741 == this->got_irelative_->offset()));
fe8718a4 1742 const section_size_type got_size =
67181c72
ILT		 1743 convert_to_section_size_type(this->got_plt_->data_size()
1744 + this->got_irelative_->data_size());
2e30d253
ILT		 1745 unsigned char* const got_view = of->get_output_view(got_file_offset,
1746 got_size);
1747
1748 unsigned char* pov = oview;
1749
c2b45e22 1750 // The base address of the .plt section.
fc51264f 1751 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
c2b45e22 1752 // The base address of the .got section.
fc51264f 1753 typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
c2b45e22
CC		 1754 // The base address of the PLT portion of the .got section,
1755 // which is where the GOT pointer will point, and where the
1756 // three reserved GOT entries are located.
fc51264f
L		 1757 typename elfcpp::Elf_types<size>::Elf_Addr got_address
1758 = this->got_plt_->address();
2e30d253 1759
2e702c99
RM		 1760 this->fill_first_plt_entry(pov, got_address, plt_address);
1761 pov += this->get_plt_entry_size();
2e30d253 1762
57b2284c
CC		 1763 // The first three entries in the GOT are reserved, and are written
1764 // by Output_data_got_plt_x86_64::do_write.
1765 unsigned char* got_pov = got_view + 24;
2e30d253 1766
2e702c99 1767 unsigned int plt_offset = this->get_plt_entry_size();
2e30d253 1768 unsigned int got_offset = 24;
67181c72 1769 const unsigned int count = this->count_ + this->irelative_count_;
2e30d253
ILT		 1770 for (unsigned int plt_index = 0;
1771 plt_index < count;
1772 ++plt_index,
2e702c99 1773 pov += this->get_plt_entry_size(),
2e30d253 1774 got_pov += 8,
2e702c99 1775 plt_offset += this->get_plt_entry_size(),
2e30d253
ILT		 1776 got_offset += 8)
1777 {
1778 // Set and adjust the PLT entry itself.
2e702c99
RM		 1779 unsigned int lazy_offset = this->fill_plt_entry(pov,
1780 got_address, plt_address,
1781 got_offset, plt_offset,
1782 plt_index);
2e30d253
ILT		 1783
1784 // Set the entry in the GOT.
2e702c99
RM		 1785 elfcpp::Swap<64, false>::writeval(got_pov,
1786 plt_address + plt_offset + lazy_offset);
2e30d253
ILT		 1787 }
1788
c2b45e22
CC		 1789 if (this->has_tlsdesc_entry())
1790 {
1791 // Set and adjust the reserved TLSDESC PLT entry.
1792 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2e702c99
RM		 1793 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
1794 tlsdesc_got_offset, plt_offset);
1795 pov += this->get_plt_entry_size();
c2b45e22
CC		 1796 }
1797
fe8718a4
ILT		 1798 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1799 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2e30d253 1800
2ea97941 1801 of->write_output_view(offset, oview_size, oview);
2e30d253
ILT		 1802 of->write_output_view(got_file_offset, got_size, got_view);
1803}
1804
c2b45e22 1805// Create the PLT section.
2e30d253 1806
fc51264f 1807template<int size>
2e30d253 1808void
fc51264f 1809Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
2e30d253 1810{
2e30d253
ILT		 1811 if (this->plt_ == NULL)
1812 {
1813 // Create the GOT sections first.
1814 this->got_section(symtab, layout);
1815
2e702c99
RM		 1816 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
1817 this->got_irelative_);
1818
1819 // Add unwind information if requested.
1820 if (parameters->options().ld_generated_unwind_info())
1821 this->plt_->add_eh_frame(layout);
1822
2e30d253
ILT		 1823 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1824 (elfcpp::SHF_ALLOC
1825 | elfcpp::SHF_EXECINSTR),
22f0da72 1826 this->plt_, ORDER_PLT, false);
7223e9ca
ILT		 1827
1828 // Make the sh_info field of .rela.plt point to .plt.
1829 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1830 rela_plt_os->set_info_section(this->plt_->output_section());
2e30d253 1831 }
c2b45e22
CC		 1832}
1833
e291e7b9
ILT		 1834// Return the section for TLSDESC relocations.
1835
fc51264f
L		 1836template<int size>
1837typename Target_x86_64<size>::Reloc_section*
1838Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
e291e7b9
ILT		 1839{
1840 return this->plt_section()->rela_tlsdesc(layout);
1841}
1842
c2b45e22
CC		 1843// Create a PLT entry for a global symbol.
1844
fc51264f 1845template<int size>
c2b45e22 1846void
fc51264f
L		 1847Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
1848 Symbol* gsym)
c2b45e22
CC		 1849{
1850 if (gsym->has_plt_offset())
1851 return;
1852
1853 if (this->plt_ == NULL)
1854 this->make_plt_section(symtab, layout);
2e30d253 1855
67181c72 1856 this->plt_->add_entry(symtab, layout, gsym);
2e30d253
ILT		 1857}
1858
7223e9ca
ILT		 1859// Make a PLT entry for a local STT_GNU_IFUNC symbol.
1860
fc51264f 1861template<int size>
7223e9ca 1862void
fc51264f
L		 1863Target_x86_64<size>::make_local_ifunc_plt_entry(
1864 Symbol_table* symtab, Layout* layout,
1865 Sized_relobj_file<size, false>* relobj,
1866 unsigned int local_sym_index)
7223e9ca
ILT		 1867{
1868 if (relobj->local_has_plt_offset(local_sym_index))
1869 return;
1870 if (this->plt_ == NULL)
1871 this->make_plt_section(symtab, layout);
67181c72
ILT		 1872 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
1873 relobj,
7223e9ca
ILT		 1874 local_sym_index);
1875 relobj->set_local_plt_offset(local_sym_index, plt_offset);
1876}
1877
0e70b911
CC		 1878// Return the number of entries in the PLT.
1879
fc51264f 1880template<int size>
0e70b911 1881unsigned int
fc51264f 1882Target_x86_64<size>::plt_entry_count() const
0e70b911
CC		 1883{
1884 if (this->plt_ == NULL)
1885 return 0;
1886 return this->plt_->entry_count();
1887}
1888
1889// Return the offset of the first non-reserved PLT entry.
1890
fc51264f 1891template<int size>
0e70b911 1892unsigned int
fc51264f 1893Target_x86_64<size>::first_plt_entry_offset() const
0e70b911 1894{
8474a88f
L		 1895 if (this->plt_ == NULL)
1896 return 0;
2e702c99 1897 return this->plt_->first_plt_entry_offset();
0e70b911
CC		 1898}
1899
1900// Return the size of each PLT entry.
1901
fc51264f 1902template<int size>
0e70b911 1903unsigned int
fc51264f 1904Target_x86_64<size>::plt_entry_size() const
0e70b911 1905{
8474a88f
L		 1906 if (this->plt_ == NULL)
1907 return 0;
2e702c99 1908 return this->plt_->get_plt_entry_size();
0e70b911
CC		 1909}
1910
4829d394
CC		 1911// Create the GOT and PLT sections for an incremental update.
1912
fc51264f 1913template<int size>
dd74ae06 1914Output_data_got_base*
fc51264f 1915Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
4829d394
CC		 1916 Layout* layout,
1917 unsigned int got_count,
1918 unsigned int plt_count)
1919{
1920 gold_assert(this->got_ == NULL);
1921
1922 this->got_ = new Output_data_got<64, false>(got_count * 8);
1923 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1924 (elfcpp::SHF_ALLOC
1925 | elfcpp::SHF_WRITE),
1926 this->got_, ORDER_RELRO_LAST,
1927 true);
1928
1929 // Add the three reserved entries.
57b2284c 1930 this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
4829d394
CC		 1931 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1932 (elfcpp::SHF_ALLOC
1933 | elfcpp::SHF_WRITE),
1934 this->got_plt_, ORDER_NON_RELRO_FIRST,
1935 false);
1936
1937 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1938 this->global_offset_table_ =
1939 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1940 Symbol_table::PREDEFINED,
1941 this->got_plt_,
1942 0, 0, elfcpp::STT_OBJECT,
1943 elfcpp::STB_LOCAL,
1944 elfcpp::STV_HIDDEN, 0,
1945 false, false);
1946
1947 // If there are any TLSDESC relocations, they get GOT entries in
1948 // .got.plt after the jump slot entries.
1949 // FIXME: Get the count for TLSDESC entries.
1950 this->got_tlsdesc_ = new Output_data_got<64, false>(0);
1951 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1952 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1953 this->got_tlsdesc_,
1954 ORDER_NON_RELRO_FIRST, false);
1955
67181c72
ILT		 1956 // If there are any IRELATIVE relocations, they get GOT entries in
1957 // .got.plt after the jump slot and TLSDESC entries.
1958 this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1959 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1960 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1961 this->got_irelative_,
1962 ORDER_NON_RELRO_FIRST, false);
1963
4829d394 1964 // Create the PLT section.
2e702c99
RM		 1965 this->plt_ = this->make_data_plt(layout, this->got_,
1966 this->got_plt_,
1967 this->got_irelative_,
1968 plt_count);
1969
1970 // Add unwind information if requested.
1971 if (parameters->options().ld_generated_unwind_info())
1972 this->plt_->add_eh_frame(layout);
1973
4829d394
CC		 1974 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1975 elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
1976 this->plt_, ORDER_PLT, false);
1977
1978 // Make the sh_info field of .rela.plt point to .plt.
1979 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1980 rela_plt_os->set_info_section(this->plt_->output_section());
1981
6fa2a40b
CC		 1982 // Create the rela_dyn section.
1983 this->rela_dyn_section(layout);
1984
4829d394
CC		 1985 return this->got_;
1986}
1987
6fa2a40b
CC		 1988// Reserve a GOT entry for a local symbol, and regenerate any
1989// necessary dynamic relocations.
1990
fc51264f 1991template<int size>
6fa2a40b 1992void
fc51264f 1993Target_x86_64<size>::reserve_local_got_entry(
6fa2a40b 1994 unsigned int got_index,
fc51264f 1995 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 1996 unsigned int r_sym,
1997 unsigned int got_type)
1998{
1999 unsigned int got_offset = got_index * 8;
2000 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
2001
2002 this->got_->reserve_local(got_index, obj, r_sym, got_type);
2003 switch (got_type)
2004 {
2005 case GOT_TYPE_STANDARD:
2006 if (parameters->options().output_is_position_independent())
2007 rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
397b129b 2008 this->got_, got_offset, 0, false);
6fa2a40b
CC		 2009 break;
2010 case GOT_TYPE_TLS_OFFSET:
2011 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
2012 this->got_, got_offset, 0);
2013 break;
2014 case GOT_TYPE_TLS_PAIR:
2015 this->got_->reserve_slot(got_index + 1);
2016 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
2017 this->got_, got_offset, 0);
2018 break;
2019 case GOT_TYPE_TLS_DESC:
2020 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
2021 // this->got_->reserve_slot(got_index + 1);
2022 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2023 // this->got_, got_offset, 0);
2024 break;
2025 default:
2026 gold_unreachable();
2027 }
2028}
2029
2030// Reserve a GOT entry for a global symbol, and regenerate any
2031// necessary dynamic relocations.
2032
fc51264f 2033template<int size>
6fa2a40b 2034void
fc51264f
L		 2035Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
2036 Symbol* gsym,
2037 unsigned int got_type)
6fa2a40b
CC		 2038{
2039 unsigned int got_offset = got_index * 8;
2040 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
2041
2042 this->got_->reserve_global(got_index, gsym, got_type);
2043 switch (got_type)
2044 {
2045 case GOT_TYPE_STANDARD:
2046 if (!gsym->final_value_is_known())
2047 {
2048 if (gsym->is_from_dynobj()
2049 || gsym->is_undefined()
2050 || gsym->is_preemptible()
2051 || gsym->type() == elfcpp::STT_GNU_IFUNC)
2052 rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
2053 this->got_, got_offset, 0);
2054 else
2055 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
13cf9988 2056 this->got_, got_offset, 0, false);
6fa2a40b
CC		 2057 }
2058 break;
2059 case GOT_TYPE_TLS_OFFSET:
2060 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
13cf9988 2061 this->got_, got_offset, 0, false);
6fa2a40b
CC		 2062 break;
2063 case GOT_TYPE_TLS_PAIR:
2064 this->got_->reserve_slot(got_index + 1);
2065 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
13cf9988 2066 this->got_, got_offset, 0, false);
6fa2a40b 2067 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
13cf9988 2068 this->got_, got_offset + 8, 0, false);
6fa2a40b
CC		 2069 break;
2070 case GOT_TYPE_TLS_DESC:
2071 this->got_->reserve_slot(got_index + 1);
2072 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
13cf9988 2073 this->got_, got_offset, 0, false);
6fa2a40b
CC		 2074 break;
2075 default:
2076 gold_unreachable();
2077 }
2078}
2079
4829d394
CC		 2080// Register an existing PLT entry for a global symbol.
2081
fc51264f 2082template<int size>
4829d394 2083void
fc51264f
L		 2084Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
2085 Layout* layout,
2086 unsigned int plt_index,
2087 Symbol* gsym)
4829d394
CC		 2088{
2089 gold_assert(this->plt_ != NULL);
2090 gold_assert(!gsym->has_plt_offset());
2091
2092 this->plt_->reserve_slot(plt_index);
2093
2094 gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
2095
2096 unsigned int got_offset = (plt_index + 3) * 8;
67181c72 2097 this->plt_->add_relocation(symtab, layout, gsym, got_offset);
4829d394
CC		 2098}
2099
26d3c67d
CC		 2100// Force a COPY relocation for a given symbol.
2101
fc51264f 2102template<int size>
26d3c67d 2103void
fc51264f 2104Target_x86_64<size>::emit_copy_reloc(
26d3c67d
CC		 2105 Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
2106{
2107 this->copy_relocs_.emit_copy_reloc(symtab,
fc51264f 2108 symtab->get_sized_symbol<size>(sym),
26d3c67d
CC		 2109 os,
2110 offset,
2111 this->rela_dyn_section(NULL));
2112}
2113
9fa33bee 2114// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029 2115
fc51264f 2116template<int size>
edfbb029 2117void
fc51264f
L		 2118Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
2119 Layout* layout)
edfbb029
CC		 2120{
2121 if (this->tls_base_symbol_defined_)
2122 return;
2123
2124 Output_segment* tls_segment = layout->tls_segment();
2125 if (tls_segment != NULL)
2126 {
183fd0e3 2127 bool is_exec = parameters->options().output_is_executable();
edfbb029 2128 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 2129 Symbol_table::PREDEFINED,
edfbb029
CC		 2130 tls_segment, 0, 0,
2131 elfcpp::STT_TLS,
2132 elfcpp::STB_LOCAL,
2133 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 2134 (is_exec
2135 ? Symbol::SEGMENT_END
2136 : Symbol::SEGMENT_START),
2137 true);
edfbb029
CC		 2138 }
2139 this->tls_base_symbol_defined_ = true;
2140}
2141
c2b45e22
CC		 2142// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
2143
fc51264f 2144template<int size>
c2b45e22 2145void
fc51264f 2146Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2e702c99 2147 Layout* layout)
c2b45e22
CC		 2148{
2149 if (this->plt_ == NULL)
2150 this->make_plt_section(symtab, layout);
2151
2152 if (!this->plt_->has_tlsdesc_entry())
2153 {
2154 // Allocate the TLSDESC_GOT entry.
2155 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2156 unsigned int got_offset = got->add_constant(0);
2157
2158 // Allocate the TLSDESC_PLT entry.
2159 this->plt_->reserve_tlsdesc_entry(got_offset);
2160 }
2161}
2162
31d60480
ILT		 2163// Create a GOT entry for the TLS module index.
2164
fc51264f 2165template<int size>
31d60480 2166unsigned int
fc51264f
L		 2167Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2168 Sized_relobj_file<size, false>* object)
31d60480
ILT		 2169{
2170 if (this->got_mod_index_offset_ == -1U)
2171 {
2172 gold_assert(symtab != NULL && layout != NULL && object != NULL);
2173 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
2174 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2175 unsigned int got_offset = got->add_constant(0);
2176 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2e702c99 2177 got_offset, 0);
009a67a2 2178 got->add_constant(0);
31d60480
ILT		 2179 this->got_mod_index_offset_ = got_offset;
2180 }
2181 return this->got_mod_index_offset_;
2182}
2183
2e30d253
ILT		 2184// Optimize the TLS relocation type based on what we know about the
2185// symbol. IS_FINAL is true if the final address of this symbol is
2186// known at link time.
2187
fc51264f 2188template<int size>
e041f13d 2189tls::Tls_optimization
fc51264f 2190Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2e30d253 2191{
2e30d253
ILT		 2192 // If we are generating a shared library, then we can't do anything
2193 // in the linker.
8851ecca 2194 if (parameters->options().shared())
e041f13d 2195 return tls::TLSOPT_NONE;
2e30d253
ILT		 2196
2197 switch (r_type)
2198 {
2199 case elfcpp::R_X86_64_TLSGD:
e041f13d
ILT		 2200 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2201 case elfcpp::R_X86_64_TLSDESC_CALL:
2202 // These are General-Dynamic which permits fully general TLS
2e30d253
ILT		 2203 // access. Since we know that we are generating an executable,
2204 // we can convert this to Initial-Exec. If we also know that
2205 // this is a local symbol, we can further switch to Local-Exec.
2206 if (is_final)
e041f13d
ILT		 2207 return tls::TLSOPT_TO_LE;
2208 return tls::TLSOPT_TO_IE;
2e30d253 2209
d61c17ea 2210 case elfcpp::R_X86_64_TLSLD:
2e30d253
ILT		 2211 // This is Local-Dynamic, which refers to a local symbol in the
2212 // dynamic TLS block. Since we know that we generating an
2213 // executable, we can switch to Local-Exec.
e041f13d 2214 return tls::TLSOPT_TO_LE;
2e30d253 2215
0ffd9845 2216 case elfcpp::R_X86_64_DTPOFF32:
0ffd9845
ILT		 2217 case elfcpp::R_X86_64_DTPOFF64:
2218 // Another Local-Dynamic reloc.
e041f13d 2219 return tls::TLSOPT_TO_LE;
0ffd9845 2220
d61c17ea 2221 case elfcpp::R_X86_64_GOTTPOFF:
2e30d253
ILT		 2222 // These are Initial-Exec relocs which get the thread offset
2223 // from the GOT. If we know that we are linking against the
2224 // local symbol, we can switch to Local-Exec, which links the
2225 // thread offset into the instruction.
2226 if (is_final)
e041f13d
ILT		 2227 return tls::TLSOPT_TO_LE;
2228 return tls::TLSOPT_NONE;
2e30d253 2229
d61c17ea 2230 case elfcpp::R_X86_64_TPOFF32:
2e30d253
ILT		 2231 // When we already have Local-Exec, there is nothing further we
2232 // can do.
e041f13d 2233 return tls::TLSOPT_NONE;
2e30d253
ILT		 2234
2235 default:
2236 gold_unreachable();
2237 }
2e30d253
ILT		 2238}
2239
95a2c8d6
RS		 2240// Get the Reference_flags for a particular relocation.
2241
fc51264f 2242template<int size>
95a2c8d6 2243int
fc51264f 2244Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
95a2c8d6
RS		 2245{
2246 switch (r_type)
2247 {
2248 case elfcpp::R_X86_64_NONE:
2249 case elfcpp::R_X86_64_GNU_VTINHERIT:
2250 case elfcpp::R_X86_64_GNU_VTENTRY:
2251 case elfcpp::R_X86_64_GOTPC32:
2252 case elfcpp::R_X86_64_GOTPC64:
2253 // No symbol reference.
2254 return 0;
2255
2256 case elfcpp::R_X86_64_64:
2257 case elfcpp::R_X86_64_32:
2258 case elfcpp::R_X86_64_32S:
2259 case elfcpp::R_X86_64_16:
2260 case elfcpp::R_X86_64_8:
2261 return Symbol::ABSOLUTE_REF;
2262
2263 case elfcpp::R_X86_64_PC64:
2264 case elfcpp::R_X86_64_PC32:
f49fe902 2265 case elfcpp::R_X86_64_PC32_BND:
95a2c8d6
RS		 2266 case elfcpp::R_X86_64_PC16:
2267 case elfcpp::R_X86_64_PC8:
2268 case elfcpp::R_X86_64_GOTOFF64:
2269 return Symbol::RELATIVE_REF;
2270
2271 case elfcpp::R_X86_64_PLT32:
f49fe902 2272 case elfcpp::R_X86_64_PLT32_BND:
95a2c8d6
RS		 2273 case elfcpp::R_X86_64_PLTOFF64:
2274 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
2275
2276 case elfcpp::R_X86_64_GOT64:
2277 case elfcpp::R_X86_64_GOT32:
2278 case elfcpp::R_X86_64_GOTPCREL64:
2279 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2280 case elfcpp::R_X86_64_GOTPCRELX:
2281 case elfcpp::R_X86_64_REX_GOTPCRELX:
95a2c8d6
RS		 2282 case elfcpp::R_X86_64_GOTPLT64:
2283 // Absolute in GOT.
2284 return Symbol::ABSOLUTE_REF;
2285
2286 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2287 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2288 case elfcpp::R_X86_64_TLSDESC_CALL:
2289 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2290 case elfcpp::R_X86_64_DTPOFF32:
2291 case elfcpp::R_X86_64_DTPOFF64:
2292 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2293 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2294 return Symbol::TLS_REF;
2295
2296 case elfcpp::R_X86_64_COPY:
2297 case elfcpp::R_X86_64_GLOB_DAT:
2298 case elfcpp::R_X86_64_JUMP_SLOT:
2299 case elfcpp::R_X86_64_RELATIVE:
2300 case elfcpp::R_X86_64_IRELATIVE:
2301 case elfcpp::R_X86_64_TPOFF64:
2302 case elfcpp::R_X86_64_DTPMOD64:
2303 case elfcpp::R_X86_64_TLSDESC:
2304 case elfcpp::R_X86_64_SIZE32:
2305 case elfcpp::R_X86_64_SIZE64:
2306 default:
2307 // Not expected. We will give an error later.
2308 return 0;
2309 }
2310}
2311
e041f13d
ILT		 2312// Report an unsupported relocation against a local symbol.
2313
fc51264f 2314template<int size>
e041f13d 2315void
fc51264f
L		 2316Target_x86_64<size>::Scan::unsupported_reloc_local(
2317 Sized_relobj_file<size, false>* object,
6fa2a40b 2318 unsigned int r_type)
e041f13d 2319{
75f2446e
ILT		 2320 gold_error(_("%s: unsupported reloc %u against local symbol"),
2321 object->name().c_str(), r_type);
e041f13d
ILT		 2322}
2323
a036edd8
ILT		 2324// We are about to emit a dynamic relocation of type R_TYPE. If the
2325// dynamic linker does not support it, issue an error. The GNU linker
2326// only issues a non-PIC error for an allocated read-only section.
2327// Here we know the section is allocated, but we don't know that it is
2328// read-only. But we check for all the relocation types which the
2329// glibc dynamic linker supports, so it seems appropriate to issue an
a29b0dad
ILT		 2330// error even if the section is not read-only. If GSYM is not NULL,
2331// it is the symbol the relocation is against; if it is NULL, the
2332// relocation is against a local symbol.
a036edd8 2333
fc51264f 2334template<int size>
a036edd8 2335void
fc51264f
L		 2336Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
2337 Symbol* gsym)
a036edd8
ILT		 2338{
2339 switch (r_type)
2340 {
2fbb4320
ILT		 2341 // These are the relocation types supported by glibc for x86_64
2342 // which should always work.
a036edd8 2343 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2344 case elfcpp::R_X86_64_IRELATIVE:
a036edd8
ILT		 2345 case elfcpp::R_X86_64_GLOB_DAT:
2346 case elfcpp::R_X86_64_JUMP_SLOT:
2347 case elfcpp::R_X86_64_DTPMOD64:
2348 case elfcpp::R_X86_64_DTPOFF64:
2349 case elfcpp::R_X86_64_TPOFF64:
2350 case elfcpp::R_X86_64_64:
2fbb4320
ILT		 2351 case elfcpp::R_X86_64_COPY:
2352 return;
2353
2354 // glibc supports these reloc types, but they can overflow.
a036edd8 2355 case elfcpp::R_X86_64_PC32:
f49fe902 2356 case elfcpp::R_X86_64_PC32_BND:
a29b0dad
ILT		 2357 // A PC relative reference is OK against a local symbol or if
2358 // the symbol is defined locally.
2359 if (gsym == NULL
2360 || (!gsym->is_from_dynobj()
2361 && !gsym->is_undefined()
2362 && !gsym->is_preemptible()))
2363 return;
2364 /* Fall through. */
2365 case elfcpp::R_X86_64_32:
3660ff06
L		 2366 // R_X86_64_32 is OK for x32.
2367 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2368 return;
2fbb4320
ILT		 2369 if (this->issued_non_pic_error_)
2370 return;
2371 gold_assert(parameters->options().output_is_position_independent());
a29b0dad
ILT		 2372 if (gsym == NULL)
2373 object->error(_("requires dynamic R_X86_64_32 reloc which may "
2374 "overflow at runtime; recompile with -fPIC"));
2375 else
f49fe902
L		 2376 {
2377 const char *r_name;
2378 switch (r_type)
2379 {
2380 case elfcpp::R_X86_64_32:
2381 r_name = "R_X86_64_32";
2382 break;
2383 case elfcpp::R_X86_64_PC32:
2384 r_name = "R_X86_64_PC32";
2385 break;
2386 case elfcpp::R_X86_64_PC32_BND:
2387 r_name = "R_X86_64_PC32_BND";
2388 break;
2389 default:
2390 gold_unreachable();
2391 break;
2392 }
2393 object->error(_("requires dynamic %s reloc against '%s' "
2394 "which may overflow at runtime; recompile "
2395 "with -fPIC"),
2396 r_name, gsym->name());
2397 }
2fbb4320 2398 this->issued_non_pic_error_ = true;
a036edd8
ILT		 2399 return;
2400
2401 default:
2402 // This prevents us from issuing more than one error per reloc
2403 // section. But we can still wind up issuing more than one
2404 // error per object file.
2405 if (this->issued_non_pic_error_)
2e702c99 2406 return;
33aea2fd 2407 gold_assert(parameters->options().output_is_position_independent());
a29b0dad 2408 object->error(_("requires unsupported dynamic reloc %u; "
2e702c99 2409 "recompile with -fPIC"),
a29b0dad 2410 r_type);
a036edd8
ILT		 2411 this->issued_non_pic_error_ = true;
2412 return;
2413
2414 case elfcpp::R_X86_64_NONE:
2415 gold_unreachable();
2416 }
2417}
2418
7223e9ca
ILT		 2419// Return whether we need to make a PLT entry for a relocation of the
2420// given type against a STT_GNU_IFUNC symbol.
2421
fc51264f 2422template<int size>
7223e9ca 2423bool
fc51264f
L		 2424Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
2425 Sized_relobj_file<size, false>* object,
6fa2a40b 2426 unsigned int r_type)
7223e9ca 2427{
95a2c8d6
RS		 2428 int flags = Scan::get_reference_flags(r_type);
2429 if (flags & Symbol::TLS_REF)
2430 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2e702c99 2431 object->name().c_str(), r_type);
95a2c8d6 2432 return flags != 0;
7223e9ca
ILT		 2433}
2434
2e30d253
ILT		 2435// Scan a relocation for a local symbol.
2436
fc51264f 2437template<int size>
2e30d253 2438inline void
fc51264f
L		 2439Target_x86_64<size>::Scan::local(Symbol_table* symtab,
2440 Layout* layout,
2441 Target_x86_64<size>* target,
2442 Sized_relobj_file<size, false>* object,
2443 unsigned int data_shndx,
2444 Output_section* output_section,
2445 const elfcpp::Rela<size, false>& reloc,
2446 unsigned int r_type,
bfdfa4cd
AM		 2447 const elfcpp::Sym<size, false>& lsym,
2448 bool is_discarded)
2e30d253 2449{
bfdfa4cd
AM		 2450 if (is_discarded)
2451 return;
2452
7223e9ca 2453 // A local STT_GNU_IFUNC symbol may require a PLT entry.
397b129b
CC		 2454 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
2455 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
7223e9ca 2456 {
fc51264f 2457 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 2458 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
2459 }
2460
2e30d253
ILT		 2461 switch (r_type)
2462 {
2463 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 2464 case elfcpp::R_X86_64_GNU_VTINHERIT:
2465 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 2466 break;
2467
2468 case elfcpp::R_X86_64_64:
d61c6bd4 2469 // If building a shared library (or a position-independent
dceae3c1
ILT		 2470 // executable), we need to create a dynamic relocation for this
2471 // location. The relocation applied at link time will apply the
2472 // link-time value, so we flag the location with an
2473 // R_X86_64_RELATIVE relocation so the dynamic loader can
d61c6bd4 2474 // relocate it easily.
8851ecca 2475 if (parameters->options().output_is_position_independent())
2e702c99
RM		 2476 {
2477 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2478 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca 2479 rela_dyn->add_local_relative(object, r_sym,
62fe925a 2480 (size == 32
fd885f3a
L		 2481 ? elfcpp::R_X86_64_RELATIVE64
2482 : elfcpp::R_X86_64_RELATIVE),
7223e9ca
ILT		 2483 output_section, data_shndx,
2484 reloc.get_r_offset(),
397b129b 2485 reloc.get_r_addend(), is_ifunc);
2e702c99 2486 }
d61c6bd4
ILT		 2487 break;
2488
2e30d253
ILT		 2489 case elfcpp::R_X86_64_32:
2490 case elfcpp::R_X86_64_32S:
2491 case elfcpp::R_X86_64_16:
2492 case elfcpp::R_X86_64_8:
96f2030e 2493 // If building a shared library (or a position-independent
dceae3c1
ILT		 2494 // executable), we need to create a dynamic relocation for this
2495 // location. We can't use an R_X86_64_RELATIVE relocation
2496 // because that is always a 64-bit relocation.
8851ecca 2497 if (parameters->options().output_is_position_independent())
2e702c99 2498 {
3660ff06
L		 2499 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2500 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2501 {
2502 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2503 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2504 rela_dyn->add_local_relative(object, r_sym,
2505 elfcpp::R_X86_64_RELATIVE,
2506 output_section, data_shndx,
2507 reloc.get_r_offset(),
2508 reloc.get_r_addend(), is_ifunc);
2509 break;
2510 }
2511
2e702c99 2512 this->check_non_pic(object, r_type, NULL);
a036edd8 2513
2e702c99 2514 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
fc51264f 2515 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2e702c99 2516 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 2517 rela_dyn->add_local(object, r_sym, r_type, output_section,
2518 data_shndx, reloc.get_r_offset(),
2519 reloc.get_r_addend());
2e702c99
RM		 2520 else
2521 {
2522 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 2523 unsigned int shndx = lsym.get_st_shndx();
2524 bool is_ordinary;
2525 shndx = object->adjust_sym_shndx(r_sym, shndx,
2526 &is_ordinary);
2527 if (!is_ordinary)
2528 object->error(_("section symbol %u has bad shndx %u"),
2529 r_sym, shndx);
2530 else
2531 rela_dyn->add_local_section(object, shndx,
2532 r_type, output_section,
2533 data_shndx, reloc.get_r_offset(),
2534 reloc.get_r_addend());
2e702c99
RM		 2535 }
2536 }
2e30d253
ILT		 2537 break;
2538
2539 case elfcpp::R_X86_64_PC64:
2540 case elfcpp::R_X86_64_PC32:
f49fe902 2541 case elfcpp::R_X86_64_PC32_BND:
2e30d253
ILT		 2542 case elfcpp::R_X86_64_PC16:
2543 case elfcpp::R_X86_64_PC8:
2544 break;
2545
f389a824 2546 case elfcpp::R_X86_64_PLT32:
f49fe902 2547 case elfcpp::R_X86_64_PLT32_BND:
f389a824
ILT		 2548 // Since we know this is a local symbol, we can handle this as a
2549 // PC32 reloc.
2550 break;
2551
fdc2f80f 2552 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 2553 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 2554 case elfcpp::R_X86_64_GOTPC64:
2555 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 2556 // We need a GOT section.
2557 target->got_section(symtab, layout);
ee9e9e86
ILT		 2558 // For PLTOFF64, we'd normally want a PLT section, but since we
2559 // know this is a local symbol, no PLT is needed.
2e30d253
ILT		 2560 break;
2561
0ffd9845
ILT		 2562 case elfcpp::R_X86_64_GOT64:
2563 case elfcpp::R_X86_64_GOT32:
2564 case elfcpp::R_X86_64_GOTPCREL64:
2565 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2566 case elfcpp::R_X86_64_GOTPCRELX:
2567 case elfcpp::R_X86_64_REX_GOTPCRELX:
ee9e9e86 2568 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845 2569 {
1fa29f10 2570 // The symbol requires a GOT section.
2e702c99 2571 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 2572
2573 // If the relocation symbol isn't IFUNC,
2574 // and is local, then we will convert
2575 // mov foo@GOTPCREL(%rip), %reg
2576 // to lea foo(%rip), %reg.
2577 // in Relocate::relocate.
2891b491
L		 2578 if ((r_type == elfcpp::R_X86_64_GOTPCREL
2579 || r_type == elfcpp::R_X86_64_GOTPCRELX
2580 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
1fa29f10
IT		 2581 && reloc.get_r_offset() >= 2
2582 && !is_ifunc)
2583 {
2584 section_size_type stype;
2585 const unsigned char* view = object->section_contents(data_shndx,
2586 &stype, true);
2587 if (view[reloc.get_r_offset() - 2] == 0x8b)
2588 break;
2589 }
2590
2591
2592 // The symbol requires a GOT entry.
2e702c99 2593 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 2594
2595 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
2596 // lets function pointers compare correctly with shared
2597 // libraries. Otherwise we would need an IRELATIVE reloc.
2598 bool is_new;
397b129b 2599 if (is_ifunc)
7223e9ca
ILT		 2600 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
2601 else
2602 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2e702c99
RM		 2603 if (is_new)
2604 {
2605 // If we are generating a shared object, we need to add a
2606 // dynamic relocation for this symbol's GOT entry.
2607 if (parameters->options().output_is_position_independent())
2608 {
2609 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7bf1f802
ILT		 2610 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2611 if (r_type != elfcpp::R_X86_64_GOT32)
7223e9ca
ILT		 2612 {
2613 unsigned int got_offset =
2614 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
2615 rela_dyn->add_local_relative(object, r_sym,
2616 elfcpp::R_X86_64_RELATIVE,
397b129b 2617 got, got_offset, 0, is_ifunc);
7223e9ca 2618 }
2e702c99
RM		 2619 else
2620 {
2621 this->check_non_pic(object, r_type, NULL);
2622
2623 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
2624 rela_dyn->add_local(
2625 object, r_sym, r_type, got,
2626 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
2627 }
2628 }
2629 }
2630 // For GOTPLT64, we'd normally want a PLT section, but since
2631 // we know this is a local symbol, no PLT is needed.
0ffd9845
ILT		 2632 }
2633 break;
2634
2e30d253
ILT		 2635 case elfcpp::R_X86_64_COPY:
2636 case elfcpp::R_X86_64_GLOB_DAT:
2637 case elfcpp::R_X86_64_JUMP_SLOT:
2638 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2639 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 2640 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 2641 case elfcpp::R_X86_64_TPOFF64:
2e30d253 2642 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 2643 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 2644 gold_error(_("%s: unexpected reloc %u in object file"),
2645 object->name().c_str(), r_type);
2e30d253
ILT		 2646 break;
2647
d61c17ea 2648 // These are initial tls relocs, which are expected when linking
56622147
ILT		 2649 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2650 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 2651 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 2652 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 2653 case elfcpp::R_X86_64_DTPOFF32:
2654 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 2655 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2656 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 2657 {
8851ecca 2658 bool output_is_shared = parameters->options().shared();
e041f13d 2659 const tls::Tls_optimization optimized_type
2e702c99 2660 = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
fc51264f 2661 r_type);
2e30d253
ILT		 2662 switch (r_type)
2663 {
2e702c99
RM		 2664 case elfcpp::R_X86_64_TLSGD: // General-dynamic
2665 if (optimized_type == tls::TLSOPT_NONE)
2666 {
2667 // Create a pair of GOT entries for the module index and
2668 // dtv-relative offset.
2669 Output_data_got<64, false>* got
2670 = target->got_section(symtab, layout);
2671 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
d491d34e
ILT		 2672 unsigned int shndx = lsym.get_st_shndx();
2673 bool is_ordinary;
2674 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
2675 if (!is_ordinary)
2676 object->error(_("local symbol %u has bad shndx %u"),
2677 r_sym, shndx);
2e702c99 2678 else
83896202
ILT		 2679 got->add_local_pair_with_rel(object, r_sym,
2680 shndx,
2681 GOT_TYPE_TLS_PAIR,
2682 target->rela_dyn_section(layout),
bd73a62d 2683 elfcpp::R_X86_64_DTPMOD64);
2e702c99
RM		 2684 }
2685 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 2686 unsupported_reloc_local(object, r_type);
2e702c99 2687 break;
7bf1f802 2688
2e702c99
RM		 2689 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2690 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 2691 if (optimized_type == tls::TLSOPT_NONE)
2692 {
2e702c99
RM		 2693 // Create reserved PLT and GOT entries for the resolver.
2694 target->reserve_tlsdesc_entries(symtab, layout);
2695
2696 // Generate a double GOT entry with an
2697 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
2698 // is resolved lazily, so the GOT entry needs to be in
2699 // an area in .got.plt, not .got. Call got_section to
2700 // make sure the section has been created.
a8df5856 2701 target->got_section(symtab, layout);
2e702c99
RM		 2702 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2703 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
e291e7b9
ILT		 2704 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
2705 {
2706 unsigned int got_offset = got->add_constant(0);
2707 got->add_constant(0);
2708 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
2709 got_offset);
2710 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2711 // We store the arguments we need in a vector, and
2712 // use the index into the vector as the parameter
2713 // to pass to the target specific routines.
2714 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
2715 void* arg = reinterpret_cast<void*>(intarg);
2716 rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2717 got, got_offset, 0);
2718 }
c2b45e22
CC		 2719 }
2720 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 2721 unsupported_reloc_local(object, r_type);
2e30d253
ILT		 2722 break;
2723
2e702c99 2724 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 2725 break;
2726
2e702c99 2727 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 2728 if (optimized_type == tls::TLSOPT_NONE)
2729 {
2e702c99
RM		 2730 // Create a GOT entry for the module index.
2731 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 2732 }
2733 else if (optimized_type != tls::TLSOPT_TO_LE)
2734 unsupported_reloc_local(object, r_type);
2735 break;
2736
2e702c99
RM		 2737 case elfcpp::R_X86_64_DTPOFF32:
2738 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 2739 break;
2740
2e702c99 2741 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 2742 layout->set_has_static_tls();
2e702c99
RM		 2743 if (optimized_type == tls::TLSOPT_NONE)
2744 {
2745 // Create a GOT entry for the tp-relative offset.
2746 Output_data_got<64, false>* got
2747 = target->got_section(symtab, layout);
2748 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2749 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 2750 target->rela_dyn_section(layout),
2751 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 2752 }
2753 else if (optimized_type != tls::TLSOPT_TO_LE)
2754 unsupported_reloc_local(object, r_type);
2755 break;
0ffd9845 2756
2e702c99 2757 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 2758 layout->set_has_static_tls();
2e702c99
RM		 2759 if (output_is_shared)
2760 unsupported_reloc_local(object, r_type);
2e30d253 2761 break;
e041f13d 2762
2e702c99
RM		 2763 default:
2764 gold_unreachable();
2e30d253
ILT		 2765 }
2766 }
2767 break;
2e30d253 2768
fdc2f80f
ILT		 2769 case elfcpp::R_X86_64_SIZE32:
2770 case elfcpp::R_X86_64_SIZE64:
2e30d253 2771 default:
75f2446e
ILT		 2772 gold_error(_("%s: unsupported reloc %u against local symbol"),
2773 object->name().c_str(), r_type);
2e30d253
ILT		 2774 break;
2775 }
2776}
2777
2778
e041f13d
ILT		 2779// Report an unsupported relocation against a global symbol.
2780
fc51264f 2781template<int size>
e041f13d 2782void
fc51264f
L		 2783Target_x86_64<size>::Scan::unsupported_reloc_global(
2784 Sized_relobj_file<size, false>* object,
6fa2a40b
CC		 2785 unsigned int r_type,
2786 Symbol* gsym)
e041f13d 2787{
75f2446e 2788 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 2789 object->name().c_str(), r_type, gsym->demangled_name().c_str());
e041f13d
ILT		 2790}
2791
ce97fa81 2792// Returns true if this relocation type could be that of a function pointer.
fc51264f 2793template<int size>
21bb3914 2794inline bool
fc51264f 2795Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
21bb3914 2796{
21bb3914
ST		 2797 switch (r_type)
2798 {
2799 case elfcpp::R_X86_64_64:
2800 case elfcpp::R_X86_64_32:
2801 case elfcpp::R_X86_64_32S:
2802 case elfcpp::R_X86_64_16:
2803 case elfcpp::R_X86_64_8:
ce97fa81
ST		 2804 case elfcpp::R_X86_64_GOT64:
2805 case elfcpp::R_X86_64_GOT32:
2806 case elfcpp::R_X86_64_GOTPCREL64:
2807 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2808 case elfcpp::R_X86_64_GOTPCRELX:
2809 case elfcpp::R_X86_64_REX_GOTPCRELX:
ce97fa81 2810 case elfcpp::R_X86_64_GOTPLT64:
21bb3914 2811 {
2e702c99 2812 return true;
21bb3914
ST		 2813 }
2814 }
2815 return false;
2816}
2817
2818// For safe ICF, scan a relocation for a local symbol to check if it
2819// corresponds to a function pointer being taken. In that case mark
2820// the function whose pointer was taken as not foldable.
2821
fc51264f 2822template<int size>
21bb3914 2823inline bool
fc51264f 2824Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
21bb3914
ST		 2825 Symbol_table* ,
2826 Layout* ,
fc51264f
L		 2827 Target_x86_64<size>* ,
2828 Sized_relobj_file<size, false>* ,
21bb3914
ST		 2829 unsigned int ,
2830 Output_section* ,
fc51264f 2831 const elfcpp::Rela<size, false>& ,
21bb3914 2832 unsigned int r_type,
fc51264f 2833 const elfcpp::Sym<size, false>&)
21bb3914
ST		 2834{
2835 // When building a shared library, do not fold any local symbols as it is
2836 // not possible to distinguish pointer taken versus a call by looking at
2837 // the relocation types.
2838 return (parameters->options().shared()
2e702c99 2839 || possible_function_pointer_reloc(r_type));
21bb3914
ST		 2840}
2841
2842// For safe ICF, scan a relocation for a global symbol to check if it
2843// corresponds to a function pointer being taken. In that case mark
2844// the function whose pointer was taken as not foldable.
2845
fc51264f 2846template<int size>
21bb3914 2847inline bool
fc51264f 2848Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
21bb3914
ST		 2849 Symbol_table*,
2850 Layout* ,
fc51264f
L		 2851 Target_x86_64<size>* ,
2852 Sized_relobj_file<size, false>* ,
21bb3914
ST		 2853 unsigned int ,
2854 Output_section* ,
fc51264f 2855 const elfcpp::Rela<size, false>& ,
21bb3914
ST		 2856 unsigned int r_type,
2857 Symbol* gsym)
2858{
2859 // When building a shared library, do not fold symbols whose visibility
2860 // is hidden, internal or protected.
2861 return ((parameters->options().shared()
2e702c99 2862 && (gsym->visibility() == elfcpp::STV_INTERNAL
21bb3914
ST		 2863 || gsym->visibility() == elfcpp::STV_PROTECTED
2864 || gsym->visibility() == elfcpp::STV_HIDDEN))
2e702c99 2865 || possible_function_pointer_reloc(r_type));
21bb3914
ST		 2866}
2867
2e30d253
ILT		 2868// Scan a relocation for a global symbol.
2869
fc51264f 2870template<int size>
2e30d253 2871inline void
fc51264f 2872Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2e702c99
RM		 2873 Layout* layout,
2874 Target_x86_64<size>* target,
2875 Sized_relobj_file<size, false>* object,
2876 unsigned int data_shndx,
2877 Output_section* output_section,
2878 const elfcpp::Rela<size, false>& reloc,
2879 unsigned int r_type,
2880 Symbol* gsym)
2e30d253 2881{
7223e9ca
ILT		 2882 // A STT_GNU_IFUNC symbol may require a PLT entry.
2883 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2884 && this->reloc_needs_plt_for_ifunc(object, r_type))
2885 target->make_plt_entry(symtab, layout, gsym);
2886
2e30d253
ILT		 2887 switch (r_type)
2888 {
2889 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 2890 case elfcpp::R_X86_64_GNU_VTINHERIT:
2891 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 2892 break;
2893
2894 case elfcpp::R_X86_64_64:
2e30d253
ILT		 2895 case elfcpp::R_X86_64_32:
2896 case elfcpp::R_X86_64_32S:
2e30d253 2897 case elfcpp::R_X86_64_16:
2e30d253 2898 case elfcpp::R_X86_64_8:
96f2030e 2899 {
2e702c99
RM		 2900 // Make a PLT entry if necessary.
2901 if (gsym->needs_plt_entry())
2902 {
2903 target->make_plt_entry(symtab, layout, gsym);
2904 // Since this is not a PC-relative relocation, we may be
2905 // taking the address of a function. In that case we need to
2906 // set the entry in the dynamic symbol table to the address of
2907 // the PLT entry.
2908 if (gsym->is_from_dynobj() && !parameters->options().shared())
2909 gsym->set_needs_dynsym_value();
2910 }
2911 // Make a dynamic relocation if necessary.
2912 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2913 {
a82bef93
ST		 2914 if (!parameters->options().output_is_position_independent()
2915 && gsym->may_need_copy_reloc())
2e702c99
RM		 2916 {
2917 target->copy_reloc(symtab, layout, object,
2918 data_shndx, output_section, gsym, reloc);
2919 }
1bae613c
L		 2920 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2921 || (size == 32 && r_type == elfcpp::R_X86_64_32))
7223e9ca
ILT		 2922 && gsym->type() == elfcpp::STT_GNU_IFUNC
2923 && gsym->can_use_relative_reloc(false)
2924 && !gsym->is_from_dynobj()
2925 && !gsym->is_undefined()
2926 && !gsym->is_preemptible())
2927 {
2928 // Use an IRELATIVE reloc for a locally defined
2929 // STT_GNU_IFUNC symbol. This makes a function
2930 // address in a PIE executable match the address in a
2931 // shared library that it links against.
67181c72
ILT		 2932 Reloc_section* rela_dyn =
2933 target->rela_irelative_section(layout);
7223e9ca
ILT		 2934 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
2935 rela_dyn->add_symbolless_global_addend(gsym, r_type,
2936 output_section, object,
2937 data_shndx,
2938 reloc.get_r_offset(),
2939 reloc.get_r_addend());
2940 }
b14016f0
L		 2941 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2942 || (size == 32 && r_type == elfcpp::R_X86_64_32))
2e702c99
RM		 2943 && gsym->can_use_relative_reloc(false))
2944 {
2945 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca
ILT		 2946 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
2947 output_section, object,
2948 data_shndx,
2949 reloc.get_r_offset(),
13cf9988 2950 reloc.get_r_addend(), false);
2e702c99
RM		 2951 }
2952 else
2953 {
2954 this->check_non_pic(object, r_type, gsym);
2955 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2956 rela_dyn->add_global(gsym, r_type, output_section, object,
2957 data_shndx, reloc.get_r_offset(),
2958 reloc.get_r_addend());
2959 }
2960 }
d61c6bd4
ILT		 2961 }
2962 break;
2963
2964 case elfcpp::R_X86_64_PC64:
2965 case elfcpp::R_X86_64_PC32:
f49fe902 2966 case elfcpp::R_X86_64_PC32_BND:
d61c6bd4
ILT		 2967 case elfcpp::R_X86_64_PC16:
2968 case elfcpp::R_X86_64_PC8:
2969 {
2e702c99
RM		 2970 // Make a PLT entry if necessary.
2971 if (gsym->needs_plt_entry())
2972 target->make_plt_entry(symtab, layout, gsym);
2973 // Make a dynamic relocation if necessary.
2974 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2975 {
a82bef93
ST		 2976 if (parameters->options().output_is_executable()
2977 && gsym->may_need_copy_reloc())
2e702c99
RM		 2978 {
2979 target->copy_reloc(symtab, layout, object,
2980 data_shndx, output_section, gsym, reloc);
2981 }
2982 else
2983 {
2984 this->check_non_pic(object, r_type, gsym);
2985 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2986 rela_dyn->add_global(gsym, r_type, output_section, object,
2987 data_shndx, reloc.get_r_offset(),
2988 reloc.get_r_addend());
2989 }
2990 }
d61c6bd4 2991 }
2e30d253
ILT		 2992 break;
2993
ff006520 2994 case elfcpp::R_X86_64_GOT64:
2e30d253 2995 case elfcpp::R_X86_64_GOT32:
ff006520
ILT		 2996 case elfcpp::R_X86_64_GOTPCREL64:
2997 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2998 case elfcpp::R_X86_64_GOTPCRELX:
2999 case elfcpp::R_X86_64_REX_GOTPCRELX:
ff006520 3000 case elfcpp::R_X86_64_GOTPLT64:
2e30d253 3001 {
2e702c99
RM		 3002 // The symbol requires a GOT entry.
3003 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 3004
3005 // If we convert this from
3006 // mov foo@GOTPCREL(%rip), %reg
3007 // to lea foo(%rip), %reg.
3a4f096e
ST		 3008 // OR
3009 // if we convert
3010 // (callq|jmpq) *foo@GOTPCRELX(%rip) to
3011 // (callq|jmpq) foo
1fa29f10 3012 // in Relocate::relocate, then there is nothing to do here.
3a4f096e
ST		 3013
3014 Lazy_view<size> view(object, data_shndx);
3015 size_t r_offset = reloc.get_r_offset();
3016 if (r_offset >= 2
3017 && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
3018 r_offset, &view))
3019 break;
3020
3021 if (r_offset >= 2
3022 && Target_x86_64<size>::can_convert_callq_to_direct(gsym, r_type,
3023 r_offset,
3024 &view))
3025 break;
1fa29f10 3026
2e702c99 3027 if (gsym->final_value_is_known())
7223e9ca
ILT		 3028 {
3029 // For a STT_GNU_IFUNC symbol we want the PLT address.
3030 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
3031 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
3032 else
3033 got->add_global(gsym, GOT_TYPE_STANDARD);
3034 }
2e702c99
RM		 3035 else
3036 {
3037 // If this symbol is not fully resolved, we need to add a
3038 // dynamic relocation for it.
3039 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
07aa62f2
ILT		 3040
3041 // Use a GLOB_DAT rather than a RELATIVE reloc if:
3042 //
3043 // 1) The symbol may be defined in some other module.
3044 //
3045 // 2) We are building a shared library and this is a
3046 // protected symbol; using GLOB_DAT means that the dynamic
3047 // linker can use the address of the PLT in the main
3048 // executable when appropriate so that function address
3049 // comparisons work.
3050 //
3051 // 3) This is a STT_GNU_IFUNC symbol in position dependent
3052 // code, again so that function address comparisons work.
7223e9ca
ILT		 3053 if (gsym->is_from_dynobj()
3054 || gsym->is_undefined()
3055 || gsym->is_preemptible()
07aa62f2
ILT		 3056 || (gsym->visibility() == elfcpp::STV_PROTECTED
3057 && parameters->options().shared())
7223e9ca
ILT		 3058 || (gsym->type() == elfcpp::STT_GNU_IFUNC
3059 && parameters->options().output_is_position_independent()))
2e702c99 3060 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
83896202 3061 elfcpp::R_X86_64_GLOB_DAT);
2e702c99
RM		 3062 else
3063 {
7223e9ca
ILT		 3064 // For a STT_GNU_IFUNC symbol we want to write the PLT
3065 // offset into the GOT, so that function pointer
3066 // comparisons work correctly.
3067 bool is_new;
3068 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
3069 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
3070 else
3071 {
3072 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
3073 // Tell the dynamic linker to use the PLT address
3074 // when resolving relocations.
3075 if (gsym->is_from_dynobj()
3076 && !parameters->options().shared())
3077 gsym->set_needs_dynsym_value();
3078 }
2e702c99 3079 if (is_new)
7223e9ca
ILT		 3080 {
3081 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
3082 rela_dyn->add_global_relative(gsym,
3083 elfcpp::R_X86_64_RELATIVE,
13cf9988 3084 got, got_off, 0, false);
7223e9ca 3085 }
2e702c99
RM		 3086 }
3087 }
2e30d253
ILT		 3088 }
3089 break;
3090
3091 case elfcpp::R_X86_64_PLT32:
f49fe902 3092 case elfcpp::R_X86_64_PLT32_BND:
2e30d253
ILT		 3093 // If the symbol is fully resolved, this is just a PC32 reloc.
3094 // Otherwise we need a PLT entry.
3095 if (gsym->final_value_is_known())
3096 break;
96f2030e
ILT		 3097 // If building a shared library, we can also skip the PLT entry
3098 // if the symbol is defined in the output file and is protected
3099 // or hidden.
3100 if (gsym->is_defined()
2e702c99
RM		 3101 && !gsym->is_from_dynobj()
3102 && !gsym->is_preemptible())
96f2030e 3103 break;
2e30d253
ILT		 3104 target->make_plt_entry(symtab, layout, gsym);
3105 break;
3106
fdc2f80f 3107 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 3108 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 3109 case elfcpp::R_X86_64_GOTPC64:
3110 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 3111 // We need a GOT section.
3112 target->got_section(symtab, layout);
ee9e9e86
ILT		 3113 // For PLTOFF64, we also need a PLT entry (but only if the
3114 // symbol is not fully resolved).
3115 if (r_type == elfcpp::R_X86_64_PLTOFF64
3116 && !gsym->final_value_is_known())
3117 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 3118 break;
3119
2e30d253
ILT		 3120 case elfcpp::R_X86_64_COPY:
3121 case elfcpp::R_X86_64_GLOB_DAT:
3122 case elfcpp::R_X86_64_JUMP_SLOT:
3123 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3124 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3125 // These are outstanding tls relocs, which are unexpected when linking
e822f2b1 3126 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3127 case elfcpp::R_X86_64_DTPMOD64:
e822f2b1 3128 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3129 gold_error(_("%s: unexpected reloc %u in object file"),
3130 object->name().c_str(), r_type);
2e30d253 3131 break;
2e30d253 3132
d61c17ea 3133 // These are initial tls relocs, which are expected for global()
56622147
ILT		 3134 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3135 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3136 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3137 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3138 case elfcpp::R_X86_64_DTPOFF32:
3139 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3140 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3141 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 3142 {
65d92137
CC		 3143 // For the Initial-Exec model, we can treat undef symbols as final
3144 // when building an executable.
3145 const bool is_final = (gsym->final_value_is_known() ||
3146 (r_type == elfcpp::R_X86_64_GOTTPOFF &&
3147 gsym->is_undefined() &&
3148 parameters->options().output_is_executable()));
e041f13d 3149 const tls::Tls_optimization optimized_type
2e702c99 3150 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 3151 switch (r_type)
3152 {
2e702c99 3153 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 3154 if (optimized_type == tls::TLSOPT_NONE)
3155 {
2e702c99
RM		 3156 // Create a pair of GOT entries for the module index and
3157 // dtv-relative offset.
3158 Output_data_got<64, false>* got
3159 = target->got_section(symtab, layout);
3160 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
83896202
ILT		 3161 target->rela_dyn_section(layout),
3162 elfcpp::R_X86_64_DTPMOD64,
3163 elfcpp::R_X86_64_DTPOFF64);
7bf1f802
ILT		 3164 }
3165 else if (optimized_type == tls::TLSOPT_TO_IE)
3166 {
2e702c99
RM		 3167 // Create a GOT entry for the tp-relative offset.
3168 Output_data_got<64, false>* got
3169 = target->got_section(symtab, layout);
3170 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3171 target->rela_dyn_section(layout),
3172 elfcpp::R_X86_64_TPOFF64);
7bf1f802
ILT		 3173 }
3174 else if (optimized_type != tls::TLSOPT_TO_LE)
3175 unsupported_reloc_global(object, r_type, gsym);
3176 break;
3177
2e702c99
RM		 3178 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3179 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 3180 if (optimized_type == tls::TLSOPT_NONE)
3181 {
2e702c99
RM		 3182 // Create reserved PLT and GOT entries for the resolver.
3183 target->reserve_tlsdesc_entries(symtab, layout);
3184
3185 // Create a double GOT entry with an R_X86_64_TLSDESC
3186 // reloc. The R_X86_64_TLSDESC reloc is resolved
3187 // lazily, so the GOT entry needs to be in an area in
3188 // .got.plt, not .got. Call got_section to make sure
3189 // the section has been created.
a8df5856 3190 target->got_section(symtab, layout);
2e702c99 3191 Output_data_got<64, false>* got = target->got_tlsdesc_section();
ca09d69a 3192 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2e702c99 3193 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
83896202 3194 elfcpp::R_X86_64_TLSDESC, 0);
c2b45e22
CC		 3195 }
3196 else if (optimized_type == tls::TLSOPT_TO_IE)
3197 {
2e702c99
RM		 3198 // Create a GOT entry for the tp-relative offset.
3199 Output_data_got<64, false>* got
3200 = target->got_section(symtab, layout);
3201 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3202 target->rela_dyn_section(layout),
3203 elfcpp::R_X86_64_TPOFF64);
c2b45e22
CC		 3204 }
3205 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 3206 unsupported_reloc_global(object, r_type, gsym);
2e30d253
ILT		 3207 break;
3208
2e702c99 3209 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 3210 break;
3211
2e702c99 3212 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 3213 if (optimized_type == tls::TLSOPT_NONE)
3214 {
2e702c99
RM		 3215 // Create a GOT entry for the module index.
3216 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 3217 }
3218 else if (optimized_type != tls::TLSOPT_TO_LE)
3219 unsupported_reloc_global(object, r_type, gsym);
3220 break;
3221
2e702c99
RM		 3222 case elfcpp::R_X86_64_DTPOFF32:
3223 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 3224 break;
3225
2e702c99 3226 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 3227 layout->set_has_static_tls();
2e702c99
RM		 3228 if (optimized_type == tls::TLSOPT_NONE)
3229 {
3230 // Create a GOT entry for the tp-relative offset.
3231 Output_data_got<64, false>* got
3232 = target->got_section(symtab, layout);
3233 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3234 target->rela_dyn_section(layout),
3235 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 3236 }
3237 else if (optimized_type != tls::TLSOPT_TO_LE)
3238 unsupported_reloc_global(object, r_type, gsym);
3239 break;
0ffd9845 3240
2e702c99 3241 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 3242 layout->set_has_static_tls();
2e702c99 3243 if (parameters->options().shared())
b1759dce 3244 unsupported_reloc_global(object, r_type, gsym);
2e30d253 3245 break;
e041f13d 3246
2e702c99
RM		 3247 default:
3248 gold_unreachable();
2e30d253
ILT		 3249 }
3250 }
3251 break;
fdc2f80f
ILT		 3252
3253 case elfcpp::R_X86_64_SIZE32:
3254 case elfcpp::R_X86_64_SIZE64:
2e30d253 3255 default:
75f2446e 3256 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 3257 object->name().c_str(), r_type,
2e702c99 3258 gsym->demangled_name().c_str());
2e30d253
ILT		 3259 break;
3260 }
3261}
3262
fc51264f 3263template<int size>
6d03d481 3264void
fc51264f
L		 3265Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
3266 Layout* layout,
3267 Sized_relobj_file<size, false>* object,
3268 unsigned int data_shndx,
3269 unsigned int sh_type,
3270 const unsigned char* prelocs,
3271 size_t reloc_count,
3272 Output_section* output_section,
3273 bool needs_special_offset_handling,
3274 size_t local_symbol_count,
3275 const unsigned char* plocal_symbols)
6d03d481 3276{
4d625b70
CC		 3277 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
3278 Classify_reloc;
6d03d481
ST		 3279
3280 if (sh_type == elfcpp::SHT_REL)
3281 {
3282 return;
3283 }
3284
4d625b70
CC		 3285 gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan,
3286 Classify_reloc>(
6d03d481
ST		 3287 symtab,
3288 layout,
3289 this,
3290 object,
3291 data_shndx,
3292 prelocs,
3293 reloc_count,
3294 output_section,
3295 needs_special_offset_handling,
3296 local_symbol_count,
3297 plocal_symbols);
2e702c99 3298
6d03d481 3299}
2e30d253
ILT		 3300// Scan relocations for a section.
3301
fc51264f 3302template<int size>
2e30d253 3303void
fc51264f
L		 3304Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
3305 Layout* layout,
3306 Sized_relobj_file<size, false>* object,
3307 unsigned int data_shndx,
3308 unsigned int sh_type,
3309 const unsigned char* prelocs,
3310 size_t reloc_count,
3311 Output_section* output_section,
3312 bool needs_special_offset_handling,
3313 size_t local_symbol_count,
3314 const unsigned char* plocal_symbols)
2e30d253 3315{
4d625b70
CC		 3316 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
3317 Classify_reloc;
3318
2e30d253
ILT		 3319 if (sh_type == elfcpp::SHT_REL)
3320 {
75f2446e
ILT		 3321 gold_error(_("%s: unsupported REL reloc section"),
3322 object->name().c_str());
3323 return;
2e30d253
ILT		 3324 }
3325
4d625b70 3326 gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>(
2e30d253
ILT		 3327 symtab,
3328 layout,
3329 this,
3330 object,
3331 data_shndx,
3332 prelocs,
3333 reloc_count,
730cdc88
ILT		 3334 output_section,
3335 needs_special_offset_handling,
2e30d253 3336 local_symbol_count,
730cdc88 3337 plocal_symbols);
2e30d253
ILT		 3338}
3339
3340// Finalize the sections.
3341
fc51264f 3342template<int size>
2e30d253 3343void
fc51264f 3344Target_x86_64<size>::do_finalize_sections(
f59f41f3
DK		 3345 Layout* layout,
3346 const Input_objects*,
e785ec03 3347 Symbol_table* symtab)
2e30d253 3348{
ea715a34
ILT		 3349 const Reloc_section* rel_plt = (this->plt_ == NULL
3350 ? NULL
e291e7b9 3351 : this->plt_->rela_plt());
ea715a34 3352 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
612a8d3d 3353 this->rela_dyn_, true, false);
2e702c99 3354
2e30d253
ILT		 3355 // Fill in some more dynamic tags.
3356 Output_data_dynamic* const odyn = layout->dynamic_data();
3357 if (odyn != NULL)
3358 {
22b127cc 3359 if (this->plt_ != NULL
ea715a34
ILT		 3360 && this->plt_->output_section() != NULL
3361 && this->plt_->has_tlsdesc_entry())
2e30d253 3362 {
ea715a34
ILT		 3363 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
3364 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
3365 this->got_->finalize_data_size();
3366 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
3367 this->plt_, plt_offset);
3368 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
3369 this->got_, got_offset);
2e30d253
ILT		 3370 }
3371 }
3372
3373 // Emit any relocs we saved in an attempt to avoid generating COPY
3374 // relocs.
12c0daef
ILT		 3375 if (this->copy_relocs_.any_saved_relocs())
3376 this->copy_relocs_.emit(this->rela_dyn_section(layout));
e785ec03
ILT		 3377
3378 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3379 // the .got.plt section.
3380 Symbol* sym = this->global_offset_table_;
3381 if (sym != NULL)
3382 {
3383 uint64_t data_size = this->got_plt_->current_data_size();
fc51264f 3384 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
e785ec03 3385 }
28a13fec 3386
67181c72
ILT		 3387 if (parameters->doing_static_link()
3388 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
28a13fec
ILT		 3389 {
3390 // If linking statically, make sure that the __rela_iplt symbols
3391 // were defined if necessary, even if we didn't create a PLT.
3392 static const Define_symbol_in_segment syms[] =
3393 {
3394 {
3395 "__rela_iplt_start", // name
3396 elfcpp::PT_LOAD, // segment_type
3397 elfcpp::PF_W, // segment_flags_set
3398 elfcpp::PF(0), // segment_flags_clear
3399 0, // value
3400 0, // size
3401 elfcpp::STT_NOTYPE, // type
3402 elfcpp::STB_GLOBAL, // binding
3403 elfcpp::STV_HIDDEN, // visibility
3404 0, // nonvis
3405 Symbol::SEGMENT_START, // offset_from_base
3406 true // only_if_ref
3407 },
3408 {
3409 "__rela_iplt_end", // name
3410 elfcpp::PT_LOAD, // segment_type
3411 elfcpp::PF_W, // segment_flags_set
3412 elfcpp::PF(0), // segment_flags_clear
3413 0, // value
3414 0, // size
3415 elfcpp::STT_NOTYPE, // type
3416 elfcpp::STB_GLOBAL, // binding
3417 elfcpp::STV_HIDDEN, // visibility
3418 0, // nonvis
3419 Symbol::SEGMENT_START, // offset_from_base
3420 true // only_if_ref
3421 }
3422 };
3423
3424 symtab->define_symbols(layout, 2, syms,
3425 layout->script_options()->saw_sections_clause());
3426 }
2e30d253
ILT		 3427}
3428
19ef3f4d
CC		 3429// For x32, we need to handle PC-relative relocations using full 64-bit
3430// arithmetic, so that we can detect relocation overflows properly.
3431// This class overrides the pcrela32_check methods from the defaults in
3432// Relocate_functions in reloc.h.
3433
3434template<int size>
3435class X86_64_relocate_functions : public Relocate_functions<size, false>
3436{
3437 public:
3438 typedef Relocate_functions<size, false> Base;
3439
3440 // Do a simple PC relative relocation with the addend in the
3441 // relocation.
3442 static inline typename Base::Reloc_status
3443 pcrela32_check(unsigned char* view,
3444 typename elfcpp::Elf_types<64>::Elf_Addr value,
3445 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
3446 typename elfcpp::Elf_types<64>::Elf_Addr address)
3447 {
3448 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
3449 Valtype* wv = reinterpret_cast<Valtype*>(view);
3450 value = value + addend - address;
3451 elfcpp::Swap<32, false>::writeval(wv, value);
3452 return (Bits<32>::has_overflow(value)
3453 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
3454 }
3455
3456 // Do a simple PC relative relocation with a Symbol_value with the
3457 // addend in the relocation.
3458 static inline typename Base::Reloc_status
3459 pcrela32_check(unsigned char* view,
3460 const Sized_relobj_file<size, false>* object,
3461 const Symbol_value<size>* psymval,
3462 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
3463 typename elfcpp::Elf_types<64>::Elf_Addr address)
3464 {
3465 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
3466 Valtype* wv = reinterpret_cast<Valtype*>(view);
7c8b700c
CC		 3467 typename elfcpp::Elf_types<64>::Elf_Addr value;
3468 if (addend >= 0)
3469 value = psymval->value(object, addend);
3470 else
3471 {
3472 // For negative addends, get the symbol value without
3473 // the addend, then add the addend using 64-bit arithmetic.
3474 value = psymval->value(object, 0);
3475 value += addend;
3476 }
3477 value -= address;
19ef3f4d
CC		 3478 elfcpp::Swap<32, false>::writeval(wv, value);
3479 return (Bits<32>::has_overflow(value)
3480 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
3481 }
3482};
3483
2e30d253
ILT		 3484// Perform a relocation.
3485
fc51264f 3486template<int size>
2e30d253 3487inline bool
fc51264f
L		 3488Target_x86_64<size>::Relocate::relocate(
3489 const Relocate_info<size, false>* relinfo,
91a65d2f 3490 unsigned int,
fc51264f
L		 3491 Target_x86_64<size>* target,
3492 Output_section*,
3493 size_t relnum,
91a65d2f 3494 const unsigned char* preloc,
fc51264f
L		 3495 const Sized_symbol<size>* gsym,
3496 const Symbol_value<size>* psymval,
3497 unsigned char* view,
3498 typename elfcpp::Elf_types<size>::Elf_Addr address,
3499 section_size_type view_size)
2e30d253 3500{
19ef3f4d 3501 typedef X86_64_relocate_functions<size> Reloc_funcs;
91a65d2f
AM		 3502 const elfcpp::Rela<size, false> rela(preloc);
3503 unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
3504
2e30d253
ILT		 3505 if (this->skip_call_tls_get_addr_)
3506 {
5efc7cd2 3507 if ((r_type != elfcpp::R_X86_64_PLT32
f5713901 3508 && r_type != elfcpp::R_X86_64_GOTPCREL
ad961eab 3509 && r_type != elfcpp::R_X86_64_GOTPCRELX
f49fe902
L		 3510 && r_type != elfcpp::R_X86_64_PLT32_BND
3511 && r_type != elfcpp::R_X86_64_PC32_BND
2e702c99 3512 && r_type != elfcpp::R_X86_64_PC32)
2e30d253 3513 || gsym == NULL
0ffd9845 3514 || strcmp(gsym->name(), "__tls_get_addr") != 0)
2e30d253 3515 {
75f2446e
ILT		 3516 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3517 _("missing expected TLS relocation"));
f5713901 3518 this->skip_call_tls_get_addr_ = false;
75f2446e
ILT		 3519 }
3520 else
3521 {
3522 this->skip_call_tls_get_addr_ = false;
3523 return false;
2e30d253 3524 }
2e30d253
ILT		 3525 }
3526
0e804863
ILT		 3527 if (view == NULL)
3528 return true;
3529
fc51264f 3530 const Sized_relobj_file<size, false>* object = relinfo->object;
7223e9ca
ILT		 3531
3532 // Pick the value to use for symbols defined in the PLT.
fc51264f 3533 Symbol_value<size> symval;
96f2030e 3534 if (gsym != NULL
95a2c8d6 3535 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
2e30d253 3536 {
19fec8c1 3537 symval.set_output_value(target->plt_address_for_global(gsym));
2e30d253
ILT		 3538 psymval = &symval;
3539 }
7223e9ca
ILT		 3540 else if (gsym == NULL && psymval->is_ifunc_symbol())
3541 {
fc51264f 3542 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7223e9ca
ILT		 3543 if (object->local_has_plt_offset(r_sym))
3544 {
19fec8c1 3545 symval.set_output_value(target->plt_address_for_local(object, r_sym));
7223e9ca
ILT		 3546 psymval = &symval;
3547 }
3548 }
2e30d253 3549
0ffd9845
ILT		 3550 const elfcpp::Elf_Xword addend = rela.get_r_addend();
3551
3552 // Get the GOT offset if needed.
96f2030e
ILT		 3553 // The GOT pointer points to the end of the GOT section.
3554 // We need to subtract the size of the GOT section to get
3555 // the actual offset to use in the relocation.
0ffd9845 3556 bool have_got_offset = false;
c23dd342
L		 3557 // Since the actual offset is always negative, we use signed int to
3558 // support 64-bit GOT relocations.
3559 int got_offset = 0;
0ffd9845
ILT		 3560 switch (r_type)
3561 {
3562 case elfcpp::R_X86_64_GOT32:
3563 case elfcpp::R_X86_64_GOT64:
3564 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845
ILT		 3565 case elfcpp::R_X86_64_GOTPCREL64:
3566 if (gsym != NULL)
2e702c99
RM		 3567 {
3568 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3569 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3570 }
0ffd9845 3571 else
2e702c99
RM		 3572 {
3573 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3574 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3575 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3576 - target->got_size());
3577 }
0ffd9845
ILT		 3578 have_got_offset = true;
3579 break;
3580
3581 default:
3582 break;
3583 }
2e30d253 3584
c34c98ed
CC		 3585 typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK;
3586
2e30d253
ILT		 3587 switch (r_type)
3588 {
3589 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 3590 case elfcpp::R_X86_64_GNU_VTINHERIT:
3591 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 3592 break;
3593
3594 case elfcpp::R_X86_64_64:
c34c98ed 3595 Reloc_funcs::rela64(view, object, psymval, addend);
2e30d253
ILT		 3596 break;
3597
3598 case elfcpp::R_X86_64_PC64:
c34c98ed 3599 Reloc_funcs::pcrela64(view, object, psymval, addend,
2e702c99 3600 address);
2e30d253
ILT		 3601 break;
3602
3603 case elfcpp::R_X86_64_32:
c34c98ed
CC		 3604 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
3605 Reloc_funcs::CHECK_UNSIGNED);
2e30d253
ILT		 3606 break;
3607
3608 case elfcpp::R_X86_64_32S:
c34c98ed
CC		 3609 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
3610 Reloc_funcs::CHECK_SIGNED);
2e30d253
ILT		 3611 break;
3612
3613 case elfcpp::R_X86_64_PC32:
f49fe902 3614 case elfcpp::R_X86_64_PC32_BND:
c34c98ed 3615 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 3616 address);
2e30d253
ILT		 3617 break;
3618
3619 case elfcpp::R_X86_64_16:
c34c98ed 3620 Reloc_funcs::rela16(view, object, psymval, addend);
2e30d253
ILT		 3621 break;
3622
3623 case elfcpp::R_X86_64_PC16:
c34c98ed 3624 Reloc_funcs::pcrela16(view, object, psymval, addend, address);
2e30d253
ILT		 3625 break;
3626
3627 case elfcpp::R_X86_64_8:
c34c98ed 3628 Reloc_funcs::rela8(view, object, psymval, addend);
2e30d253
ILT		 3629 break;
3630
3631 case elfcpp::R_X86_64_PC8:
c34c98ed 3632 Reloc_funcs::pcrela8(view, object, psymval, addend, address);
2e30d253
ILT		 3633 break;
3634
3635 case elfcpp::R_X86_64_PLT32:
f49fe902 3636 case elfcpp::R_X86_64_PLT32_BND:
f389a824 3637 gold_assert(gsym == NULL
2e702c99 3638 || gsym->has_plt_offset()
99f8faca
ILT		 3639 || gsym->final_value_is_known()
3640 || (gsym->is_defined()
3641 && !gsym->is_from_dynobj()
3642 && !gsym->is_preemptible()));
ee9e9e86
ILT		 3643 // Note: while this code looks the same as for R_X86_64_PC32, it
3644 // behaves differently because psymval was set to point to
3645 // the PLT entry, rather than the symbol, in Scan::global().
c34c98ed 3646 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 3647 address);
2e30d253
ILT		 3648 break;
3649
ee9e9e86
ILT		 3650 case elfcpp::R_X86_64_PLTOFF64:
3651 {
2e702c99
RM		 3652 gold_assert(gsym);
3653 gold_assert(gsym->has_plt_offset()
3654 || gsym->final_value_is_known());
fc51264f 3655 typename elfcpp::Elf_types<size>::Elf_Addr got_address;
c23dd342
L		 3656 // This is the address of GLOBAL_OFFSET_TABLE.
3657 got_address = target->got_plt_section()->address();
c34c98ed 3658 Reloc_funcs::rela64(view, object, psymval, addend - got_address);
ee9e9e86 3659 }
7849f6d8 3660 break;
ee9e9e86 3661
2e30d253 3662 case elfcpp::R_X86_64_GOT32:
0ffd9845 3663 gold_assert(have_got_offset);
c34c98ed 3664 Reloc_funcs::rela32(view, got_offset, addend);
2e30d253
ILT		 3665 break;
3666
e822f2b1
ILT		 3667 case elfcpp::R_X86_64_GOTPC32:
3668 {
2e702c99 3669 gold_assert(gsym);
fc51264f 3670 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 3671 value = target->got_plt_section()->address();
19ef3f4d 3672 Reloc_funcs::pcrela32_check(view, value, addend, address);
e822f2b1
ILT		 3673 }
3674 break;
3675
3676 case elfcpp::R_X86_64_GOT64:
fdc2f80f 3677 case elfcpp::R_X86_64_GOTPLT64:
e88ba8d5
L		 3678 // R_X86_64_GOTPLT64 is obsolete and treated the the same as
3679 // GOT64.
0ffd9845 3680 gold_assert(have_got_offset);
c34c98ed 3681 Reloc_funcs::rela64(view, got_offset, addend);
e822f2b1
ILT		 3682 break;
3683
3684 case elfcpp::R_X86_64_GOTPC64:
3685 {
2e702c99 3686 gold_assert(gsym);
fc51264f 3687 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 3688 value = target->got_plt_section()->address();
c34c98ed 3689 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 3690 }
3691 break;
3692
2e30d253
ILT		 3693 case elfcpp::R_X86_64_GOTOFF64:
3694 {
fc51264f 3695 typename elfcpp::Elf_types<size>::Elf_Addr value;
2e30d253 3696 value = (psymval->value(object, 0)
96f2030e 3697 - target->got_plt_section()->address());
c34c98ed 3698 Reloc_funcs::rela64(view, value, addend);
2e30d253
ILT		 3699 }
3700 break;
3701
3702 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3703 case elfcpp::R_X86_64_GOTPCRELX:
3704 case elfcpp::R_X86_64_REX_GOTPCRELX:
2e30d253 3705 {
1fa29f10
IT		 3706 // Convert
3707 // mov foo@GOTPCREL(%rip), %reg
3708 // to lea foo(%rip), %reg.
3709 // if possible.
3a4f096e
ST		 3710 if ((gsym == NULL
3711 && rela.get_r_offset() >= 2
3712 && view[-2] == 0x8b
3713 && !psymval->is_ifunc_symbol())
3714 || (gsym != NULL
3715 && rela.get_r_offset() >= 2
3716 && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type,
3717 0, &view)))
1fa29f10
IT		 3718 {
3719 view[-2] = 0x8d;
19ef3f4d 3720 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
1fa29f10 3721 }
3a4f096e
ST		 3722 // Convert
3723 // callq *foo@GOTPCRELX(%rip) to
3724 // addr32 callq foo
3725 // and jmpq *foo@GOTPCRELX(%rip) to
3726 // jmpq foo
3727 // nop
3728 else if (gsym != NULL
3729 && rela.get_r_offset() >= 2
3730 && Target_x86_64<size>::can_convert_callq_to_direct(gsym,
3731 r_type,
3732 0, &view))
3733 {
3734 if (view[-1] == 0x15)
3735 {
3736 // Convert callq *foo@GOTPCRELX(%rip) to addr32 callq.
3737 // Opcode of addr32 is 0x67 and opcode of direct callq is 0xe8.
3738 view[-2] = 0x67;
3739 view[-1] = 0xe8;
3740 // Convert GOTPCRELX to 32-bit pc relative reloc.
3741 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
3742 }
3743 else
3744 {
3745 // Convert jmpq *foo@GOTPCRELX(%rip) to
3746 // jmpq foo
3747 // nop
3748 // The opcode of direct jmpq is 0xe9.
3749 view[-2] = 0xe9;
3750 // The opcode of nop is 0x90.
3751 view[3] = 0x90;
3752 // Convert GOTPCRELX to 32-bit pc relative reloc. jmpq is rip
3753 // relative and since the instruction following the jmpq is now
3754 // the nop, offset the address by 1 byte. The start of the
3755 // relocation also moves ahead by 1 byte.
3756 Reloc_funcs::pcrela32(&view[-1], object, psymval, addend,
3757 address - 1);
3758 }
3759 }
1fa29f10
IT		 3760 else
3761 {
3762 if (gsym != NULL)
3763 {
3764 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3765 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3766 }
3767 else
3768 {
3769 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3770 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3771 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3772 - target->got_size());
3773 }
3774 typename elfcpp::Elf_types<size>::Elf_Addr value;
3775 value = target->got_plt_section()->address() + got_offset;
19ef3f4d 3776 Reloc_funcs::pcrela32_check(view, value, addend, address);
1fa29f10 3777 }
2e30d253
ILT		 3778 }
3779 break;
3780
e822f2b1
ILT		 3781 case elfcpp::R_X86_64_GOTPCREL64:
3782 {
2e702c99
RM		 3783 gold_assert(have_got_offset);
3784 typename elfcpp::Elf_types<size>::Elf_Addr value;
3785 value = target->got_plt_section()->address() + got_offset;
c34c98ed 3786 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 3787 }
3788 break;
3789
2e30d253
ILT		 3790 case elfcpp::R_X86_64_COPY:
3791 case elfcpp::R_X86_64_GLOB_DAT:
3792 case elfcpp::R_X86_64_JUMP_SLOT:
3793 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3794 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3795 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 3796 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3797 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 3798 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3799 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3800 _("unexpected reloc %u in object file"),
3801 r_type);
2e30d253
ILT		 3802 break;
3803
d61c17ea 3804 // These are initial tls relocs, which are expected when linking
56622147
ILT		 3805 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3806 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3807 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3808 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3809 case elfcpp::R_X86_64_DTPOFF32:
3810 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3811 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3812 case elfcpp::R_X86_64_TPOFF32: // Local-exec
7bf1f802 3813 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
2e702c99 3814 view, address, view_size);
2e30d253 3815 break;
2e30d253 3816
fdc2f80f
ILT		 3817 case elfcpp::R_X86_64_SIZE32:
3818 case elfcpp::R_X86_64_SIZE64:
2e30d253 3819 default:
75f2446e
ILT		 3820 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3821 _("unsupported reloc %u"),
3822 r_type);
2e30d253
ILT		 3823 break;
3824 }
3825
c34c98ed 3826 if (rstatus == Reloc_funcs::RELOC_OVERFLOW)
17ecd016
CC		 3827 {
3828 if (gsym == NULL)
3829 {
3830 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3831 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3832 _("relocation overflow: "
3833 "reference to local symbol %u in %s"),
3834 r_sym, object->name().c_str());
3835 }
3836 else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT)
3837 {
3838 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3839 _("relocation overflow: "
3840 "reference to '%s' defined in %s"),
3841 gsym->name(),
3842 gsym->object()->name().c_str());
3843 }
3844 else
3845 {
3846 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3847 _("relocation overflow: reference to '%s'"),
3848 gsym->name());
3849 }
3850 }
c34c98ed 3851
2e30d253
ILT		 3852 return true;
3853}
3854
3855// Perform a TLS relocation.
3856
fc51264f 3857template<int size>
2e30d253 3858inline void
fc51264f
L		 3859Target_x86_64<size>::Relocate::relocate_tls(
3860 const Relocate_info<size, false>* relinfo,
3861 Target_x86_64<size>* target,
3862 size_t relnum,
3863 const elfcpp::Rela<size, false>& rela,
3864 unsigned int r_type,
3865 const Sized_symbol<size>* gsym,
3866 const Symbol_value<size>* psymval,
3867 unsigned char* view,
3868 typename elfcpp::Elf_types<size>::Elf_Addr address,
3869 section_size_type view_size)
2e30d253 3870{
2e30d253 3871 Output_segment* tls_segment = relinfo->layout->tls_segment();
7bf1f802 3872
fc51264f 3873 const Sized_relobj_file<size, false>* object = relinfo->object;
6a41d30b 3874 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 3875 elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
36171d64 3876 bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
2e30d253 3877
fc51264f 3878 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
2e30d253
ILT		 3879
3880 const bool is_final = (gsym == NULL
b3705d2a 3881 ? !parameters->options().shared()
2e30d253 3882 : gsym->final_value_is_known());
36171d64 3883 tls::Tls_optimization optimized_type
fc51264f 3884 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 3885 switch (r_type)
3886 {
56622147 3887 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
36171d64
CC		 3888 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3889 {
3890 // If this code sequence is used in a non-executable section,
3891 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3892 // on the assumption that it's being used by itself in a debug
3893 // section. Therefore, in the unlikely event that the code
3894 // sequence appears in a non-executable section, we simply
3895 // leave it unoptimized.
3896 optimized_type = tls::TLSOPT_NONE;
3897 }
e041f13d 3898 if (optimized_type == tls::TLSOPT_TO_LE)
2e30d253 3899 {
62855347
ILT		 3900 if (tls_segment == NULL)
3901 {
191f1a2d
ILT		 3902 gold_assert(parameters->errors()->error_count() > 0
3903 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3904 return;
3905 }
2e30d253 3906 this->tls_gd_to_le(relinfo, relnum, tls_segment,
72ec2876 3907 rela, r_type, value, view,
2e30d253
ILT		 3908 view_size);
3909 break;
3910 }
7bf1f802 3911 else
2e702c99
RM		 3912 {
3913 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3914 ? GOT_TYPE_TLS_OFFSET
3915 : GOT_TYPE_TLS_PAIR);
3916 unsigned int got_offset;
3917 if (gsym != NULL)
3918 {
3919 gold_assert(gsym->has_got_offset(got_type));
3920 got_offset = gsym->got_offset(got_type) - target->got_size();
3921 }
3922 else
3923 {
3924 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3925 gold_assert(object->local_has_got_offset(r_sym, got_type));
3926 got_offset = (object->local_got_offset(r_sym, got_type)
3927 - target->got_size());
3928 }
3929 if (optimized_type == tls::TLSOPT_TO_IE)
3930 {
3931 value = target->got_plt_section()->address() + got_offset;
d21f123b 3932 this->tls_gd_to_ie(relinfo, relnum, rela, r_type,
2e702c99
RM		 3933 value, view, address, view_size);
3934 break;
3935 }
3936 else if (optimized_type == tls::TLSOPT_NONE)
3937 {
3938 // Relocate the field with the offset of the pair of GOT
3939 // entries.
6a41d30b 3940 value = target->got_plt_section()->address() + got_offset;
2e702c99 3941 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3942 address);
2e702c99
RM		 3943 break;
3944 }
3945 }
72ec2876 3946 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 3947 _("unsupported reloc %u"), r_type);
2e30d253
ILT		 3948 break;
3949
c2b45e22
CC		 3950 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3951 case elfcpp::R_X86_64_TLSDESC_CALL:
36171d64
CC		 3952 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3953 {
3954 // See above comment for R_X86_64_TLSGD.
3955 optimized_type = tls::TLSOPT_NONE;
3956 }
c2b45e22
CC		 3957 if (optimized_type == tls::TLSOPT_TO_LE)
3958 {
62855347
ILT		 3959 if (tls_segment == NULL)
3960 {
191f1a2d
ILT		 3961 gold_assert(parameters->errors()->error_count() > 0
3962 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3963 return;
3964 }
c2b45e22 3965 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2e702c99
RM		 3966 rela, r_type, value, view,
3967 view_size);
c2b45e22
CC		 3968 break;
3969 }
3970 else
2e702c99
RM		 3971 {
3972 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3973 ? GOT_TYPE_TLS_OFFSET
3974 : GOT_TYPE_TLS_DESC);
3975 unsigned int got_offset = 0;
a8df5856
ILT		 3976 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
3977 && optimized_type == tls::TLSOPT_NONE)
3978 {
3979 // We created GOT entries in the .got.tlsdesc portion of
3980 // the .got.plt section, but the offset stored in the
3981 // symbol is the offset within .got.tlsdesc.
3982 got_offset = (target->got_size()
3983 + target->got_plt_section()->data_size());
3984 }
2e702c99
RM		 3985 if (gsym != NULL)
3986 {
3987 gold_assert(gsym->has_got_offset(got_type));
3988 got_offset += gsym->got_offset(got_type) - target->got_size();
3989 }
3990 else
3991 {
3992 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3993 gold_assert(object->local_has_got_offset(r_sym, got_type));
3994 got_offset += (object->local_got_offset(r_sym, got_type)
a8df5856 3995 - target->got_size());
2e702c99
RM		 3996 }
3997 if (optimized_type == tls::TLSOPT_TO_IE)
3998 {
2e702c99 3999 value = target->got_plt_section()->address() + got_offset;
d21f123b 4000 this->tls_desc_gd_to_ie(relinfo, relnum,
2e702c99
RM		 4001 rela, r_type, value, view, address,
4002 view_size);
4003 break;
4004 }
4005 else if (optimized_type == tls::TLSOPT_NONE)
4006 {
4007 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4008 {
4009 // Relocate the field with the offset of the pair of GOT
4010 // entries.
4011 value = target->got_plt_section()->address() + got_offset;
4012 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 4013 address);
2e702c99
RM		 4014 }
4015 break;
4016 }
4017 }
c2b45e22
CC		 4018 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4019 _("unsupported reloc %u"), r_type);
4020 break;
4021
56622147 4022 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
36171d64
CC		 4023 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
4024 {
4025 // See above comment for R_X86_64_TLSGD.
4026 optimized_type = tls::TLSOPT_NONE;
4027 }
e041f13d 4028 if (optimized_type == tls::TLSOPT_TO_LE)
2e702c99 4029 {
62855347
ILT		 4030 if (tls_segment == NULL)
4031 {
191f1a2d
ILT		 4032 gold_assert(parameters->errors()->error_count() > 0
4033 || issue_undefined_symbol_error(gsym));
62855347
ILT		 4034 return;
4035 }
72ec2876
ILT		 4036 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
4037 value, view, view_size);
4038 break;
2e702c99 4039 }
7bf1f802 4040 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 4041 {
4042 // Relocate the field with the offset of the GOT entry for
4043 // the module index.
4044 unsigned int got_offset;
4045 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
31d60480 4046 - target->got_size());
6a41d30b 4047 value = target->got_plt_section()->address() + got_offset;
2e702c99 4048 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 4049 address);
2e702c99
RM		 4050 break;
4051 }
72ec2876 4052 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 4053 _("unsupported reloc %u"), r_type);
2e30d253 4054 break;
0ffd9845
ILT		 4055
4056 case elfcpp::R_X86_64_DTPOFF32:
36171d64
CC		 4057 // This relocation type is used in debugging information.
4058 // In that case we need to not optimize the value. If the
4059 // section is not executable, then we assume we should not
4060 // optimize this reloc. See comments above for R_X86_64_TLSGD,
4061 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
4062 // R_X86_64_TLSLD.
4063 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
4064 {
62855347
ILT		 4065 if (tls_segment == NULL)
4066 {
191f1a2d
ILT		 4067 gold_assert(parameters->errors()->error_count() > 0
4068 || issue_undefined_symbol_error(gsym));
62855347
ILT		 4069 return;
4070 }
36171d64
CC		 4071 value -= tls_segment->memsz();
4072 }
fc51264f 4073 Relocate_functions<size, false>::rela32(view, value, addend);
0ffd9845
ILT		 4074 break;
4075
4076 case elfcpp::R_X86_64_DTPOFF64:
36171d64
CC		 4077 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
4078 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
4079 {
62855347
ILT		 4080 if (tls_segment == NULL)
4081 {
191f1a2d
ILT		 4082 gold_assert(parameters->errors()->error_count() > 0
4083 || issue_undefined_symbol_error(gsym));
62855347
ILT		 4084 return;
4085 }
36171d64
CC		 4086 value -= tls_segment->memsz();
4087 }
fc51264f 4088 Relocate_functions<size, false>::rela64(view, value, addend);
0ffd9845 4089 break;
2e30d253 4090
56622147 4091 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
24dd5808
CC		 4092 if (gsym != NULL
4093 && gsym->is_undefined()
4094 && parameters->options().output_is_executable())
65d92137
CC		 4095 {
4096 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
4097 NULL, rela,
4098 r_type, value, view,
4099 view_size);
4100 break;
4101 }
4102 else if (optimized_type == tls::TLSOPT_TO_LE)
56622147 4103 {
62855347
ILT		 4104 if (tls_segment == NULL)
4105 {
191f1a2d
ILT		 4106 gold_assert(parameters->errors()->error_count() > 0
4107 || issue_undefined_symbol_error(gsym));
62855347
ILT		 4108 return;
4109 }
fc51264f
L		 4110 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
4111 tls_segment, rela,
4112 r_type, value, view,
4113 view_size);
56622147
ILT		 4114 break;
4115 }
7bf1f802 4116 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 4117 {
4118 // Relocate the field with the offset of the GOT entry for
4119 // the tp-relative offset of the symbol.
4120 unsigned int got_offset;
4121 if (gsym != NULL)
4122 {
4123 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
4124 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
4125 - target->got_size());
4126 }
4127 else
4128 {
4129 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
4130 gold_assert(object->local_has_got_offset(r_sym,
4131 GOT_TYPE_TLS_OFFSET));
4132 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
4133 - target->got_size());
4134 }
6a41d30b 4135 value = target->got_plt_section()->address() + got_offset;
2e702c99 4136 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 4137 address);
2e702c99
RM		 4138 break;
4139 }
56622147
ILT		 4140 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
4141 _("unsupported reloc type %u"),
4142 r_type);
4143 break;
0ffd9845 4144
56622147 4145 case elfcpp::R_X86_64_TPOFF32: // Local-exec
62855347
ILT		 4146 if (tls_segment == NULL)
4147 {
191f1a2d
ILT		 4148 gold_assert(parameters->errors()->error_count() > 0
4149 || issue_undefined_symbol_error(gsym));
62855347
ILT		 4150 return;
4151 }
6a41d30b 4152 value -= tls_segment->memsz();
fc51264f 4153 Relocate_functions<size, false>::rela32(view, value, addend);
56622147 4154 break;
2e30d253 4155 }
2e30d253
ILT		 4156}
4157
7bf1f802
ILT		 4158// Do a relocation in which we convert a TLS General-Dynamic to an
4159// Initial-Exec.
4160
fc51264f 4161template<int size>
7bf1f802 4162inline void
fc51264f
L		 4163Target_x86_64<size>::Relocate::tls_gd_to_ie(
4164 const Relocate_info<size, false>* relinfo,
4165 size_t relnum,
fc51264f
L		 4166 const elfcpp::Rela<size, false>& rela,
4167 unsigned int,
4168 typename elfcpp::Elf_types<size>::Elf_Addr value,
4169 unsigned char* view,
4170 typename elfcpp::Elf_types<size>::Elf_Addr address,
4171 section_size_type view_size)
7bf1f802 4172{
41194d9f
L		 4173 // For SIZE == 64:
4174 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 4175 // .word 0x6666; rex64; call __tls_get_addr@PLT
4176 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
4177 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4178 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f
L		 4179 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
4180 // For SIZE == 32:
4181 // leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 4182 // .word 0x6666; rex64; call __tls_get_addr@PLT
4183 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
4184 // leaq foo@tlsgd(%rip),%rdi;
4185 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f 4186 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
7bf1f802 4187
7bf1f802 4188 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
7bf1f802 4189 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ad961eab
L		 4190 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
4191 || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
7bf1f802 4192
41194d9f
L		 4193 if (size == 64)
4194 {
4195 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4196 -4);
4197 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4198 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
4199 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
4200 16);
4201 }
4202 else
4203 {
4204 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4205 -3);
4206 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4207 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
4208 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
4209 15);
4210 }
7bf1f802 4211
c2b45e22 4212 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f
L		 4213 Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
4214 address);
7bf1f802
ILT		 4215
4216 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4217 // We can skip it.
4218 this->skip_call_tls_get_addr_ = true;
4219}
4220
e041f13d 4221// Do a relocation in which we convert a TLS General-Dynamic to a
2e30d253
ILT		 4222// Local-Exec.
4223
fc51264f 4224template<int size>
2e30d253 4225inline void
fc51264f
L		 4226Target_x86_64<size>::Relocate::tls_gd_to_le(
4227 const Relocate_info<size, false>* relinfo,
4228 size_t relnum,
4229 Output_segment* tls_segment,
4230 const elfcpp::Rela<size, false>& rela,
4231 unsigned int,
4232 typename elfcpp::Elf_types<size>::Elf_Addr value,
4233 unsigned char* view,
4234 section_size_type view_size)
2e30d253 4235{
41194d9f
L		 4236 // For SIZE == 64:
4237 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 4238 // .word 0x6666; rex64; call __tls_get_addr@PLT
4239 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
4240 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4241 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f
L		 4242 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
4243 // For SIZE == 32:
4244 // leaq foo@tlsgd(%rip),%rdi;
ad961eab
L		 4245 // .word 0x6666; rex64; call __tls_get_addr@PLT
4246 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
4247 // leaq foo@tlsgd(%rip),%rdi;
4248 // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip)
41194d9f 4249 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
2e30d253 4250
72ec2876 4251 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
72ec2876 4252 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
ad961eab
L		 4253 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0
4254 || memcmp(view + 4, "\x66\x48\xff", 3) == 0));
41194d9f
L		 4255
4256 if (size == 64)
4257 {
4258 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4259 -4);
4260 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4261 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
4262 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4263 16);
4264 }
4265 else
4266 {
4267 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4268 -3);
4269 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4270 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
2e30d253 4271
41194d9f
L		 4272 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4273 15);
4274 }
2e30d253 4275
6a41d30b 4276 value -= tls_segment->memsz();
fc51264f 4277 Relocate_functions<size, false>::rela32(view + 8, value, 0);
2e30d253
ILT		 4278
4279 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4280 // We can skip it.
4281 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 4282}
4283
c2b45e22
CC		 4284// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
4285
fc51264f 4286template<int size>
c2b45e22 4287inline void
fc51264f
L		 4288Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
4289 const Relocate_info<size, false>* relinfo,
c2b45e22 4290 size_t relnum,
fc51264f 4291 const elfcpp::Rela<size, false>& rela,
c2b45e22 4292 unsigned int r_type,
fc51264f 4293 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 4294 unsigned char* view,
fc51264f 4295 typename elfcpp::Elf_types<size>::Elf_Addr address,
c2b45e22
CC		 4296 section_size_type view_size)
4297{
4298 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4299 {
4300 // leaq foo@tlsdesc(%rip), %rax
4301 // ==> movq foo@gottpoff(%rip), %rax
4302 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4303 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4304 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4305 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 4306 view[-2] = 0x8b;
4307 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 4308 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
c2b45e22
CC		 4309 }
4310 else
4311 {
4312 // call *foo@tlscall(%rax)
4313 // ==> nop; nop
4314 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4315 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4316 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4317 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 4318 view[0] = 0x66;
4319 view[1] = 0x90;
4320 }
4321}
4322
4323// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
4324
fc51264f 4325template<int size>
c2b45e22 4326inline void
fc51264f
L		 4327Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
4328 const Relocate_info<size, false>* relinfo,
c2b45e22
CC		 4329 size_t relnum,
4330 Output_segment* tls_segment,
fc51264f 4331 const elfcpp::Rela<size, false>& rela,
c2b45e22 4332 unsigned int r_type,
fc51264f 4333 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 4334 unsigned char* view,
4335 section_size_type view_size)
4336{
4337 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4338 {
4339 // leaq foo@tlsdesc(%rip), %rax
4340 // ==> movq foo@tpoff, %rax
4341 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4342 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4343 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4344 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 4345 view[-2] = 0xc7;
4346 view[-1] = 0xc0;
4347 value -= tls_segment->memsz();
fc51264f 4348 Relocate_functions<size, false>::rela32(view, value, 0);
c2b45e22
CC		 4349 }
4350 else
4351 {
4352 // call *foo@tlscall(%rax)
4353 // ==> nop; nop
4354 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4355 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4356 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4357 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 4358 view[0] = 0x66;
4359 view[1] = 0x90;
4360 }
4361}
4362
fc51264f 4363template<int size>
2e30d253 4364inline void
fc51264f
L		 4365Target_x86_64<size>::Relocate::tls_ld_to_le(
4366 const Relocate_info<size, false>* relinfo,
4367 size_t relnum,
4368 Output_segment*,
4369 const elfcpp::Rela<size, false>& rela,
4370 unsigned int,
4371 typename elfcpp::Elf_types<size>::Elf_Addr,
4372 unsigned char* view,
4373 section_size_type view_size)
2e30d253 4374{
72ec2876 4375 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
d2cf1c6c 4376 // For SIZE == 64:
72ec2876
ILT		 4377 // ... leq foo@dtpoff(%rax),%reg
4378 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
d2cf1c6c
L		 4379 // For SIZE == 32:
4380 // ... leq foo@dtpoff(%rax),%reg
4381 // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
ad961eab
L		 4382 // leaq foo@tlsld(%rip),%rdi; call *__tls_get_addr@GOTPCREL(%rip)
4383 // For SIZE == 64:
4384 // ... leq foo@dtpoff(%rax),%reg
4385 // ==> .word 0x6666; .byte 0x6666; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
4386 // For SIZE == 32:
4387 // ... leq foo@dtpoff(%rax),%reg
4388 // ==> nopw 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
2e30d253 4389
72ec2876
ILT		 4390 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4391 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
2e30d253 4392
72ec2876 4393 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4394 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
72ec2876 4395
ad961eab
L		 4396 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4397 view[4] == 0xe8 || view[4] == 0xff);
72ec2876 4398
ad961eab
L		 4399 if (view[4] == 0xe8)
4400 {
4401 if (size == 64)
4402 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
4403 else
4404 memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
4405 }
d2cf1c6c 4406 else
ad961eab
L		 4407 {
4408 if (size == 64)
4409 memcpy(view - 3, "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0",
4410 13);
4411 else
4412 memcpy(view - 3, "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0",
4413 13);
4414 }
72ec2876
ILT		 4415
4416 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4417 // We can skip it.
4418 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 4419}
4420
56622147
ILT		 4421// Do a relocation in which we convert a TLS Initial-Exec to a
4422// Local-Exec.
4423
fc51264f 4424template<int size>
56622147 4425inline void
fc51264f
L		 4426Target_x86_64<size>::Relocate::tls_ie_to_le(
4427 const Relocate_info<size, false>* relinfo,
4428 size_t relnum,
4429 Output_segment* tls_segment,
4430 const elfcpp::Rela<size, false>& rela,
4431 unsigned int,
4432 typename elfcpp::Elf_types<size>::Elf_Addr value,
4433 unsigned char* view,
4434 section_size_type view_size)
56622147
ILT		 4435{
4436 // We need to examine the opcodes to figure out which instruction we
4437 // are looking at.
4438
4439 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
4440 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
4441
4442 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4443 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4444
4445 unsigned char op1 = view[-3];
4446 unsigned char op2 = view[-2];
4447 unsigned char op3 = view[-1];
4448 unsigned char reg = op3 >> 3;
4449
4450 if (op2 == 0x8b)
4451 {
4452 // movq
4453 if (op1 == 0x4c)
2e702c99 4454 view[-3] = 0x49;
e749cab8
L		 4455 else if (size == 32 && op1 == 0x44)
4456 view[-3] = 0x41;
56622147
ILT		 4457 view[-2] = 0xc7;
4458 view[-1] = 0xc0 | reg;
4459 }
4460 else if (reg == 4)
4461 {
4462 // Special handling for %rsp.
4463 if (op1 == 0x4c)
2e702c99 4464 view[-3] = 0x49;
e749cab8
L		 4465 else if (size == 32 && op1 == 0x44)
4466 view[-3] = 0x41;
56622147
ILT		 4467 view[-2] = 0x81;
4468 view[-1] = 0xc0 | reg;
4469 }
4470 else
4471 {
4472 // addq
4473 if (op1 == 0x4c)
2e702c99 4474 view[-3] = 0x4d;
e749cab8
L		 4475 else if (size == 32 && op1 == 0x44)
4476 view[-3] = 0x45;
56622147
ILT		 4477 view[-2] = 0x8d;
4478 view[-1] = 0x80 | reg | (reg << 3);
4479 }
4480
65d92137
CC		 4481 if (tls_segment != NULL)
4482 value -= tls_segment->memsz();
fc51264f 4483 Relocate_functions<size, false>::rela32(view, value, 0);
56622147
ILT		 4484}
4485
2e30d253
ILT		 4486// Relocate section data.
4487
fc51264f 4488template<int size>
2e30d253 4489void
fc51264f
L		 4490Target_x86_64<size>::relocate_section(
4491 const Relocate_info<size, false>* relinfo,
364c7fa5
ILT		 4492 unsigned int sh_type,
4493 const unsigned char* prelocs,
4494 size_t reloc_count,
4495 Output_section* output_section,
4496 bool needs_special_offset_handling,
4497 unsigned char* view,
fc51264f 4498 typename elfcpp::Elf_types<size>::Elf_Addr address,
364c7fa5
ILT		 4499 section_size_type view_size,
4500 const Reloc_symbol_changes* reloc_symbol_changes)
2e30d253 4501{
4d625b70
CC		 4502 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4503 Classify_reloc;
4504
2e30d253
ILT		 4505 gold_assert(sh_type == elfcpp::SHT_RELA);
4506
4d625b70
CC		 4507 gold::relocate_section<size, false, Target_x86_64<size>, Relocate,
4508 gold::Default_comdat_behavior, Classify_reloc>(
2e30d253
ILT		 4509 relinfo,
4510 this,
4511 prelocs,
4512 reloc_count,
730cdc88
ILT		 4513 output_section,
4514 needs_special_offset_handling,
2e30d253
ILT		 4515 view,
4516 address,
364c7fa5
ILT		 4517 view_size,
4518 reloc_symbol_changes);
2e30d253
ILT		 4519}
4520
94a3fc8b
CC		 4521// Apply an incremental relocation. Incremental relocations always refer
4522// to global symbols.
4523
fc51264f 4524template<int size>
94a3fc8b 4525void
fc51264f
L		 4526Target_x86_64<size>::apply_relocation(
4527 const Relocate_info<size, false>* relinfo,
4528 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 4529 unsigned int r_type,
fc51264f 4530 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 4531 const Symbol* gsym,
4532 unsigned char* view,
fc51264f 4533 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 4534 section_size_type view_size)
4535{
fc51264f 4536 gold::apply_relocation<size, false, Target_x86_64<size>,
618d6666 4537 typename Target_x86_64<size>::Relocate>(
94a3fc8b
CC		 4538 relinfo,
4539 this,
4540 r_offset,
4541 r_type,
4542 r_addend,
4543 gsym,
4544 view,
4545 address,
4546 view_size);
4547}
4548
4d625b70 4549// Scan the relocs during a relocatable link.
6a74a719 4550
fc51264f 4551template<int size>
4d625b70
CC		 4552void
4553Target_x86_64<size>::scan_relocatable_relocs(
4554 Symbol_table* symtab,
4555 Layout* layout,
4556 Sized_relobj_file<size, false>* object,
4557 unsigned int data_shndx,
4558 unsigned int sh_type,
4559 const unsigned char* prelocs,
4560 size_t reloc_count,
4561 Output_section* output_section,
4562 bool needs_special_offset_handling,
4563 size_t local_symbol_count,
4564 const unsigned char* plocal_symbols,
4565 Relocatable_relocs* rr)
6a74a719 4566{
4d625b70
CC		 4567 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4568 Classify_reloc;
4569 typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
4570 Scan_relocatable_relocs;
6a74a719 4571
4d625b70 4572 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 4573
4d625b70
CC		 4574 gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>(
4575 symtab,
4576 layout,
4577 object,
4578 data_shndx,
4579 prelocs,
4580 reloc_count,
4581 output_section,
4582 needs_special_offset_handling,
4583 local_symbol_count,
4584 plocal_symbols,
4585 rr);
6a74a719
ILT		 4586}
4587
4d625b70 4588// Scan the relocs for --emit-relocs.
6a74a719 4589
fc51264f 4590template<int size>
6a74a719 4591void
4d625b70 4592Target_x86_64<size>::emit_relocs_scan(
fc51264f
L		 4593 Symbol_table* symtab,
4594 Layout* layout,
4595 Sized_relobj_file<size, false>* object,
4596 unsigned int data_shndx,
4597 unsigned int sh_type,
4598 const unsigned char* prelocs,
4599 size_t reloc_count,
4600 Output_section* output_section,
4601 bool needs_special_offset_handling,
4602 size_t local_symbol_count,
4d625b70 4603 const unsigned char* plocal_syms,
fc51264f 4604 Relocatable_relocs* rr)
6a74a719 4605{
4d625b70
CC		 4606 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4607 Classify_reloc;
4608 typedef gold::Default_emit_relocs_strategy<Classify_reloc>
4609 Emit_relocs_strategy;
6a74a719 4610
4d625b70 4611 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 4612
4d625b70 4613 gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>(
6a74a719
ILT		 4614 symtab,
4615 layout,
4616 object,
4617 data_shndx,
4618 prelocs,
4619 reloc_count,
4620 output_section,
4621 needs_special_offset_handling,
4622 local_symbol_count,
4d625b70 4623 plocal_syms,
6a74a719
ILT		 4624 rr);
4625}
4626
4627// Relocate a section during a relocatable link.
4628
fc51264f 4629template<int size>
6a74a719 4630void
7404fe1b 4631Target_x86_64<size>::relocate_relocs(
fc51264f 4632 const Relocate_info<size, false>* relinfo,
6a74a719
ILT		 4633 unsigned int sh_type,
4634 const unsigned char* prelocs,
4635 size_t reloc_count,
4636 Output_section* output_section,
62fe925a 4637 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
6a74a719 4638 unsigned char* view,
fc51264f 4639 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
6a74a719
ILT		 4640 section_size_type view_size,
4641 unsigned char* reloc_view,
4642 section_size_type reloc_view_size)
4643{
4d625b70
CC		 4644 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4645 Classify_reloc;
4646
6a74a719
ILT		 4647 gold_assert(sh_type == elfcpp::SHT_RELA);
4648
4d625b70 4649 gold::relocate_relocs<size, false, Classify_reloc>(
6a74a719
ILT		 4650 relinfo,
4651 prelocs,
4652 reloc_count,
4653 output_section,
4654 offset_in_output_section,
6a74a719
ILT		 4655 view,
4656 view_address,
4657 view_size,
4658 reloc_view,
4659 reloc_view_size);
4660}
4661
4fb6c25d
ILT		 4662// Return the value to use for a dynamic which requires special
4663// treatment. This is how we support equality comparisons of function
4664// pointers across shared library boundaries, as described in the
4665// processor specific ABI supplement.
4666
fc51264f 4667template<int size>
4fb6c25d 4668uint64_t
fc51264f 4669Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4fb6c25d
ILT		 4670{
4671 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
19fec8c1 4672 return this->plt_address_for_global(gsym);
4fb6c25d
ILT		 4673}
4674
2e30d253
ILT		 4675// Return a string used to fill a code section with nops to take up
4676// the specified length.
4677
fc51264f 4678template<int size>
2e30d253 4679std::string
fc51264f 4680Target_x86_64<size>::do_code_fill(section_size_type length) const
2e30d253
ILT		 4681{
4682 if (length >= 16)
4683 {
4684 // Build a jmpq instruction to skip over the bytes.
4685 unsigned char jmp[5];
4686 jmp[0] = 0xe9;
04bf7072 4687 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2e30d253 4688 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2e702c99 4689 + std::string(length - 5, static_cast<char>(0x90)));
2e30d253
ILT		 4690 }
4691
4692 // Nop sequences of various lengths.
76677ad0
CC		 4693 const char nop1[1] = { '\x90' }; // nop
4694 const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
4695 const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4696 const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
2e702c99 4697 '\x00'};
76677ad0
CC		 4698 const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
4699 '\x00', '\x00' };
4700 const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
2e702c99 4701 '\x44', '\x00', '\x00' };
76677ad0 4702 const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
2e702c99 4703 '\x00', '\x00', '\x00',
76677ad0
CC		 4704 '\x00' };
4705 const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
2e702c99 4706 '\x00', '\x00', '\x00',
76677ad0
CC		 4707 '\x00', '\x00' };
4708 const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
2e702c99 4709 '\x84', '\x00', '\x00',
76677ad0
CC		 4710 '\x00', '\x00', '\x00' };
4711 const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
2e702c99 4712 '\x1f', '\x84', '\x00',
76677ad0
CC		 4713 '\x00', '\x00', '\x00',
4714 '\x00' };
4715 const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
2e702c99 4716 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4717 '\x00', '\x00', '\x00',
4718 '\x00', '\x00' };
4719 const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
2e702c99 4720 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4721 '\x84', '\x00', '\x00',
4722 '\x00', '\x00', '\x00' };
4723 const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4724 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4725 '\x1f', '\x84', '\x00',
4726 '\x00', '\x00', '\x00',
2e702c99 4727 '\x00' };
76677ad0 4728 const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4729 '\x66', '\x66', '\x2e', // data16
76677ad0
CC		 4730 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4731 '\x00', '\x00', '\x00',
2e702c99 4732 '\x00', '\x00' };
76677ad0 4733 const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4734 '\x66', '\x66', '\x66', // data16; data16
76677ad0
CC		 4735 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4736 '\x84', '\x00', '\x00',
2e702c99 4737 '\x00', '\x00', '\x00' };
2e30d253
ILT		 4738
4739 const char* nops[16] = {
4740 NULL,
4741 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
4742 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
4743 };
4744
4745 return std::string(nops[length], length);
4746}
4747
e291e7b9
ILT		 4748// Return the addend to use for a target specific relocation. The
4749// only target specific relocation is R_X86_64_TLSDESC for a local
4750// symbol. We want to set the addend is the offset of the local
4751// symbol in the TLS segment.
4752
fc51264f 4753template<int size>
e291e7b9 4754uint64_t
fc51264f
L		 4755Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
4756 uint64_t) const
e291e7b9
ILT		 4757{
4758 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
4759 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
4760 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
4761 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
fc51264f 4762 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
e291e7b9
ILT		 4763 gold_assert(psymval->is_tls_symbol());
4764 // The value of a TLS symbol is the offset in the TLS segment.
4765 return psymval->value(ti.object, 0);
4766}
4767
02d7cd44
ILT		 4768// Return the value to use for the base of a DW_EH_PE_datarel offset
4769// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
4770// assembler can not write out the difference between two labels in
4771// different sections, so instead of using a pc-relative value they
4772// use an offset from the GOT.
4773
fc51264f 4774template<int size>
02d7cd44 4775uint64_t
fc51264f 4776Target_x86_64<size>::do_ehframe_datarel_base() const
02d7cd44
ILT		 4777{
4778 gold_assert(this->global_offset_table_ != NULL);
4779 Symbol* sym = this->global_offset_table_;
fc51264f 4780 Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
02d7cd44
ILT		 4781 return ssym->value();
4782}
4783
364c7fa5 4784// FNOFFSET in section SHNDX in OBJECT is the start of a function
9b547ce6 4785// compiled with -fsplit-stack. The function calls non-split-stack
364c7fa5
ILT		 4786// code. We have to change the function so that it always ensures
4787// that it has enough stack space to run some random function.
4788
4fc1b9d4
L		 4789static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 };
4790static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 };
4791static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 };
4792
4793static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 };
4794static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 };
4795static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 };
4796
fc51264f 4797template<int size>
364c7fa5 4798void
fc51264f
L		 4799Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
4800 section_offset_type fnoffset,
4801 section_size_type fnsize,
6e0813d3
CC		 4802 const unsigned char*,
4803 size_t,
fc51264f
L		 4804 unsigned char* view,
4805 section_size_type view_size,
4806 std::string* from,
4807 std::string* to) const
364c7fa5 4808{
4fc1b9d4
L		 4809 const char* const cmp_insn = reinterpret_cast<const char*>
4810 (size == 32 ? cmp_insn_32 : cmp_insn_64);
4811 const char* const lea_r10_insn = reinterpret_cast<const char*>
4812 (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64);
4813 const char* const lea_r11_insn = reinterpret_cast<const char*>
4814 (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64);
4815
4816 const size_t cmp_insn_len =
4817 (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64));
4818 const size_t lea_r10_insn_len =
4819 (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64));
4820 const size_t lea_r11_insn_len =
4821 (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64));
4822 const size_t nop_len = (size == 32 ? 7 : 8);
4823
364c7fa5
ILT		 4824 // The function starts with a comparison of the stack pointer and a
4825 // field in the TCB. This is followed by a jump.
4826
4827 // cmp %fs:NN,%rsp
4fc1b9d4
L		 4828 if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len)
4829 && fnsize > nop_len + 1)
364c7fa5
ILT		 4830 {
4831 // We will call __morestack if the carry flag is set after this
4832 // comparison. We turn the comparison into an stc instruction
4833 // and some nops.
4834 view[fnoffset] = '\xf9';
4fc1b9d4 4835 this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len);
364c7fa5
ILT		 4836 }
4837 // lea NN(%rsp),%r10
cbc999b9
ILT		 4838 // lea NN(%rsp),%r11
4839 else if ((this->match_view(view, view_size, fnoffset,
4fc1b9d4 4840 lea_r10_insn, lea_r10_insn_len)
cbc999b9 4841 || this->match_view(view, view_size, fnoffset,
4fc1b9d4 4842 lea_r11_insn, lea_r11_insn_len))
364c7fa5
ILT		 4843 && fnsize > 8)
4844 {
4845 // This is loading an offset from the stack pointer for a
4846 // comparison. The offset is negative, so we decrease the
4847 // offset by the amount of space we need for the stack. This
4848 // means we will avoid calling __morestack if there happens to
4849 // be plenty of space on the stack already.
4850 unsigned char* pval = view + fnoffset + 4;
4851 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
4852 val -= parameters->options().split_stack_adjust_size();
4853 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
4854 }
4855 else
4856 {
4857 if (!object->has_no_split_stack())
4858 object->error(_("failed to match split-stack sequence at "
4859 "section %u offset %0zx"),
ac33a407 4860 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 4861 return;
4862 }
4863
4864 // We have to change the function so that it calls
4865 // __morestack_non_split instead of __morestack. The former will
4866 // allocate additional stack space.
4867 *from = "__morestack";
4868 *to = "__morestack_non_split";
4869}
4870
2e702c99
RM		 4871// The selector for x86_64 object files. Note this is never instantiated
4872// directly. It's only used in Target_selector_x86_64_nacl, below.
2e30d253 4873
fc51264f 4874template<int size>
36959681 4875class Target_selector_x86_64 : public Target_selector_freebsd
2e30d253
ILT		 4876{
4877public:
4878 Target_selector_x86_64()
fc51264f 4879 : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
2e702c99 4880 (size == 64
fc51264f 4881 ? "elf64-x86-64" : "elf32-x86-64"),
2e702c99 4882 (size == 64
fc51264f
L		 4883 ? "elf64-x86-64-freebsd"
4884 : "elf32-x86-64-freebsd"),
4885 (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
2e30d253
ILT		 4886 { }
4887
4888 Target*
e96caa79 4889 do_instantiate_target()
fc51264f 4890 { return new Target_x86_64<size>(); }
36959681 4891
2e30d253
ILT		 4892};
4893
2e702c99
RM		 4894// NaCl variant. It uses different PLT contents.
4895
4896template<int size>
4897class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
4898{
4899 public:
4900 Output_data_plt_x86_64_nacl(Layout* layout,
4901 Output_data_got<64, false>* got,
57b2284c 4902 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4903 Output_data_space* got_irelative)
4904 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4905 got, got_plt, got_irelative)
4906 { }
4907
4908 Output_data_plt_x86_64_nacl(Layout* layout,
4909 Output_data_got<64, false>* got,
57b2284c 4910 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4911 Output_data_space* got_irelative,
4912 unsigned int plt_count)
4913 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4914 got, got_plt, got_irelative,
4915 plt_count)
4916 { }
4917
4918 protected:
4919 virtual unsigned int
4920 do_get_plt_entry_size() const
4921 { return plt_entry_size; }
4922
4923 virtual void
4924 do_add_eh_frame(Layout* layout)
4925 {
4926 layout->add_eh_frame_for_plt(this,
4927 this->plt_eh_frame_cie,
4928 this->plt_eh_frame_cie_size,
4929 plt_eh_frame_fde,
4930 plt_eh_frame_fde_size);
4931 }
4932
4933 virtual void
4934 do_fill_first_plt_entry(unsigned char* pov,
4935 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
4936 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
4937
4938 virtual unsigned int
4939 do_fill_plt_entry(unsigned char* pov,
4940 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4941 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4942 unsigned int got_offset,
4943 unsigned int plt_offset,
4944 unsigned int plt_index);
4945
4946 virtual void
4947 do_fill_tlsdesc_entry(unsigned char* pov,
4948 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4949 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4950 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4951 unsigned int tlsdesc_got_offset,
4952 unsigned int plt_offset);
4953
4954 private:
4955 // The size of an entry in the PLT.
4956 static const int plt_entry_size = 64;
4957
4958 // The first entry in the PLT.
4959 static const unsigned char first_plt_entry[plt_entry_size];
4960
4961 // Other entries in the PLT for an executable.
4962 static const unsigned char plt_entry[plt_entry_size];
4963
4964 // The reserved TLSDESC entry in the PLT for an executable.
4965 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
4966
4967 // The .eh_frame unwind information for the PLT.
4968 static const int plt_eh_frame_fde_size = 32;
4969 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
4970};
4971
4972template<int size>
4973class Target_x86_64_nacl : public Target_x86_64<size>
4974{
4975 public:
4976 Target_x86_64_nacl()
4977 : Target_x86_64<size>(&x86_64_nacl_info)
4978 { }
4979
4980 virtual Output_data_plt_x86_64<size>*
4981 do_make_data_plt(Layout* layout,
4982 Output_data_got<64, false>* got,
57b2284c 4983 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4984 Output_data_space* got_irelative)
4985 {
4986 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4987 got_irelative);
4988 }
4989
4990 virtual Output_data_plt_x86_64<size>*
4991 do_make_data_plt(Layout* layout,
4992 Output_data_got<64, false>* got,
57b2284c 4993 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4994 Output_data_space* got_irelative,
4995 unsigned int plt_count)
4996 {
4997 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4998 got_irelative,
4999 plt_count);
5000 }
5001
93f8221c
RM		 5002 virtual std::string
5003 do_code_fill(section_size_type length) const;
5004
2e702c99
RM		 5005 private:
5006 static const Target::Target_info x86_64_nacl_info;
5007};
5008
5009template<>
5010const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
5011{
5012 64, // size
5013 false, // is_big_endian
5014 elfcpp::EM_X86_64, // machine_code
5015 false, // has_make_symbol
5016 false, // has_resolve
5017 true, // has_code_fill
5018 true, // is_default_stack_executable
5019 true, // can_icf_inline_merge_sections
5020 '\0', // wrap_char
5021 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
5022 0x20000, // default_text_segment_address
5023 0x10000, // abi_pagesize (overridable by -z max-page-size)
5024 0x10000, // common_pagesize (overridable by -z common-page-size)
5025 true, // isolate_execinstr
5026 0x10000000, // rosegment_gap
5027 elfcpp::SHN_UNDEF, // small_common_shndx
5028 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
5029 0, // small_common_section_flags
5030 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
5031 NULL, // attributes_section
a67858e0 5032 NULL, // attributes_vendor
8d9743bd
MK		 5033 "_start", // entry_symbol_name
5034 32, // hash_entry_size
2e702c99
RM		 5035};
5036
5037template<>
5038const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
5039{
5040 32, // size
5041 false, // is_big_endian
5042 elfcpp::EM_X86_64, // machine_code
5043 false, // has_make_symbol
5044 false, // has_resolve
5045 true, // has_code_fill
5046 true, // is_default_stack_executable
5047 true, // can_icf_inline_merge_sections
5048 '\0', // wrap_char
5049 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
5050 0x20000, // default_text_segment_address
5051 0x10000, // abi_pagesize (overridable by -z max-page-size)
5052 0x10000, // common_pagesize (overridable by -z common-page-size)
5053 true, // isolate_execinstr
5054 0x10000000, // rosegment_gap
5055 elfcpp::SHN_UNDEF, // small_common_shndx
5056 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
5057 0, // small_common_section_flags
5058 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
5059 NULL, // attributes_section
a67858e0 5060 NULL, // attributes_vendor
8d9743bd
MK		 5061 "_start", // entry_symbol_name
5062 32, // hash_entry_size
2e702c99
RM		 5063};
5064
5065#define NACLMASK 0xe0 // 32-byte alignment mask.
5066
5067// The first entry in the PLT.
5068
5069template<int size>
5070const unsigned char
5071Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
5072{
5073 0xff, 0x35, // pushq contents of memory address
5074 0, 0, 0, 0, // replaced with address of .got + 8
5075 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
5076 0, 0, 0, 0, // replaced with address of .got + 16
5077 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
5078 0x4d, 0x01, 0xfb, // add %r15, %r11
5079 0x41, 0xff, 0xe3, // jmpq *%r11
5080
5081 // 9-byte nop sequence to pad out to the next 32-byte boundary.
dd0845d7 5082 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
2e702c99
RM		 5083
5084 // 32 bytes of nop to pad out to the standard size
5085 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5086 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5087 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5088 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5089 0x66, // excess data32 prefix
5090 0x90 // nop
5091};
5092
5093template<int size>
5094void
5095Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
5096 unsigned char* pov,
5097 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
5098 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
5099{
5100 memcpy(pov, first_plt_entry, plt_entry_size);
5101 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
5102 (got_address + 8
5103 - (plt_address + 2 + 4)));
5104 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
5105 (got_address + 16
5106 - (plt_address + 9 + 4)));
5107}
5108
5109// Subsequent entries in the PLT.
5110
5111template<int size>
5112const unsigned char
5113Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
5114{
5115 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
5116 0, 0, 0, 0, // replaced with address of symbol in .got
5117 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
5118 0x4d, 0x01, 0xfb, // add %r15, %r11
5119 0x41, 0xff, 0xe3, // jmpq *%r11
5120
5121 // 15-byte nop sequence to pad out to the next 32-byte boundary.
5122 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5123 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5124
5125 // Lazy GOT entries point here (32-byte aligned).
5126 0x68, // pushq immediate
5127 0, 0, 0, 0, // replaced with index into relocation table
5128 0xe9, // jmp relative
5129 0, 0, 0, 0, // replaced with offset to start of .plt0
5130
5131 // 22 bytes of nop to pad out to the standard size.
5132 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5133 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5134 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
5135};
5136
5137template<int size>
5138unsigned int
5139Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
5140 unsigned char* pov,
5141 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
5142 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
5143 unsigned int got_offset,
5144 unsigned int plt_offset,
5145 unsigned int plt_index)
5146{
5147 memcpy(pov, plt_entry, plt_entry_size);
5148 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
5149 (got_address + got_offset
5150 - (plt_address + plt_offset
5151 + 3 + 4)));
5152
5153 elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
5154 elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
5155 - (plt_offset + 38 + 4));
5156
5157 return 32;
5158}
5159
5160// The reserved TLSDESC entry in the PLT.
5161
5162template<int size>
5163const unsigned char
5164Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
5165{
5166 0xff, 0x35, // pushq x(%rip)
5167 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
5168 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
5169 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
5170 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
5171 0x4d, 0x01, 0xfb, // add %r15, %r11
5172 0x41, 0xff, 0xe3, // jmpq *%r11
5173
5174 // 41 bytes of nop to pad out to the standard size.
5175 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5176 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5177 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
5178 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5179 0x66, 0x66, // excess data32 prefixes
5180 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
5181};
5182
5183template<int size>
5184void
5185Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
5186 unsigned char* pov,
5187 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
5188 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
5189 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
5190 unsigned int tlsdesc_got_offset,
5191 unsigned int plt_offset)
5192{
5193 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
5194 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
5195 (got_address + 8
5196 - (plt_address + plt_offset
5197 + 2 + 4)));
5198 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
5199 (got_base
5200 + tlsdesc_got_offset
5201 - (plt_address + plt_offset
5202 + 9 + 4)));
5203}
5204
5205// The .eh_frame unwind information for the PLT.
5206
5207template<int size>
5208const unsigned char
5209Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
5210{
5211 0, 0, 0, 0, // Replaced with offset to .plt.
5212 0, 0, 0, 0, // Replaced with size of .plt.
5213 0, // Augmentation size.
5214 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
5215 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
5216 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
5217 elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
5218 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
5219 13, // Block length.
5220 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
5221 elfcpp::DW_OP_breg16, 0, // Push %rip.
5222 elfcpp::DW_OP_const1u, 63, // Push 0x3f.
5223 elfcpp::DW_OP_and, // & (%rip & 0x3f).
5224 elfcpp::DW_OP_const1u, 37, // Push 0x25.
5225 elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
5226 elfcpp::DW_OP_lit3, // Push 3.
5227 elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
5228 elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
5229 elfcpp::DW_CFA_nop, // Align to 32 bytes.
5230 elfcpp::DW_CFA_nop
5231};
5232
93f8221c
RM		 5233// Return a string used to fill a code section with nops.
5234// For NaCl, long NOPs are only valid if they do not cross
5235// bundle alignment boundaries, so keep it simple with one-byte NOPs.
5236template<int size>
5237std::string
5238Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
5239{
5240 return std::string(length, static_cast<char>(0x90));
5241}
5242
2e702c99
RM		 5243// The selector for x86_64-nacl object files.
5244
5245template<int size>
5246class Target_selector_x86_64_nacl
5247 : public Target_selector_nacl<Target_selector_x86_64<size>,
5248 Target_x86_64_nacl<size> >
5249{
5250 public:
5251 Target_selector_x86_64_nacl()
5252 : Target_selector_nacl<Target_selector_x86_64<size>,
5253 Target_x86_64_nacl<size> >("x86-64",
5254 size == 64
5255 ? "elf64-x86-64-nacl"
5256 : "elf32-x86-64-nacl",
5257 size == 64
5258 ? "elf_x86_64_nacl"
5259 : "elf32_x86_64_nacl")
5260 { }
5261};
5262
5263Target_selector_x86_64_nacl<64> target_selector_x86_64;
5264Target_selector_x86_64_nacl<32> target_selector_x32;
2e30d253
ILT		 5265
5266} // End anonymous namespace.
GDB Binutils - Deliverables
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