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PR binutils/14006
[deliverable/binutils-gdb.git] / gold / x86_64.cc
CommitLineData
2e30d253
ILT		 1// x86_64.cc -- x86_64 target support for gold.
2
9dee3b3c
ILT		 3// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012
4// Free Software Foundation, Inc.
2e30d253
ILT		 5// Written by Ian Lance Taylor <iant@google.com>.
6
7// This file is part of gold.
8
8b105e34
ILT		 9// This program is free software; you can redistribute it and/or modify
10// it under the terms of the GNU General Public License as published by
11// the Free Software Foundation; either version 3 of the License, or
2e30d253
ILT		 12// (at your option) any later version.
13
8b105e34
ILT		 14// This program is distributed in the hope that it will be useful,
15// but WITHOUT ANY WARRANTY; without even the implied warranty of
16// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17// GNU General Public License for more details.
18
19// You should have received a copy of the GNU General Public License
20// along with this program; if not, write to the Free Software
21// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
22// MA 02110-1301, USA.
2e30d253
ILT		 23
24#include "gold.h"
25
26#include <cstring>
27
28#include "elfcpp.h"
07a60597 29#include "dwarf.h"
2e30d253
ILT		 30#include "parameters.h"
31#include "reloc.h"
32#include "x86_64.h"
33#include "object.h"
34#include "symtab.h"
35#include "layout.h"
36#include "output.h"
12c0daef 37#include "copy-relocs.h"
2e30d253
ILT		 38#include "target.h"
39#include "target-reloc.h"
40#include "target-select.h"
e041f13d 41#include "tls.h"
36959681 42#include "freebsd.h"
2e702c99 43#include "nacl.h"
f345227a 44#include "gc.h"
21bb3914 45#include "icf.h"
2e30d253
ILT		 46
47namespace
48{
49
50using namespace gold;
51
7223e9ca 52// A class to handle the PLT data.
2e702c99
RM		 53// This is an abstract base class that handles most of the linker details
54// but does not know the actual contents of PLT entries. The derived
55// classes below fill in those details.
7223e9ca 56
fc51264f 57template<int size>
7223e9ca
ILT		 58class Output_data_plt_x86_64 : public Output_section_data
59{
60 public:
fc51264f 61 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
7223e9ca 62
2e702c99
RM		 63 Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
64 Output_data_got<64, false>* got,
4829d394 65 Output_data_space* got_plt,
67181c72 66 Output_data_space* got_irelative)
2e702c99 67 : Output_section_data(addralign), layout_(layout), tlsdesc_rel_(NULL),
7d172687
ILT		 68 irelative_rel_(NULL), got_(got), got_plt_(got_plt),
69 got_irelative_(got_irelative), count_(0), irelative_count_(0),
70 tlsdesc_got_offset_(-1U), free_list_()
67181c72
ILT		 71 { this->init(layout); }
72
2e702c99
RM		 73 Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
74 Output_data_got<64, false>* got,
67181c72
ILT		 75 Output_data_space* got_plt,
76 Output_data_space* got_irelative,
4829d394 77 unsigned int plt_count)
2e702c99
RM		 78 : Output_section_data((plt_count + 1) * plt_entry_size,
79 plt_entry_size, false),
7d172687
ILT		 80 layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
81 got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
82 irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
4829d394 83 {
67181c72 84 this->init(layout);
4829d394
CC		 85
86 // Initialize the free list and reserve the first entry.
87 this->free_list_.init((plt_count + 1) * plt_entry_size, false);
88 this->free_list_.remove(0, plt_entry_size);
89 }
90
91 // Initialize the PLT section.
92 void
67181c72 93 init(Layout* layout);
7223e9ca
ILT		 94
95 // Add an entry to the PLT.
96 void
67181c72 97 add_entry(Symbol_table*, Layout*, Symbol* gsym);
7223e9ca
ILT		 98
99 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
100 unsigned int
67181c72 101 add_local_ifunc_entry(Symbol_table* symtab, Layout*,
fc51264f 102 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 103 unsigned int local_sym_index);
104
4829d394
CC		 105 // Add the relocation for a PLT entry.
106 void
67181c72
ILT		 107 add_relocation(Symbol_table*, Layout*, Symbol* gsym,
108 unsigned int got_offset);
4829d394 109
7223e9ca
ILT		 110 // Add the reserved TLSDESC_PLT entry to the PLT.
111 void
112 reserve_tlsdesc_entry(unsigned int got_offset)
113 { this->tlsdesc_got_offset_ = got_offset; }
114
115 // Return true if a TLSDESC_PLT entry has been reserved.
116 bool
117 has_tlsdesc_entry() const
118 { return this->tlsdesc_got_offset_ != -1U; }
119
120 // Return the GOT offset for the reserved TLSDESC_PLT entry.
121 unsigned int
122 get_tlsdesc_got_offset() const
123 { return this->tlsdesc_got_offset_; }
124
125 // Return the offset of the reserved TLSDESC_PLT entry.
126 unsigned int
127 get_tlsdesc_plt_offset() const
2e702c99
RM		 128 {
129 return ((this->count_ + this->irelative_count_ + 1)
130 * this->get_plt_entry_size());
131 }
7223e9ca
ILT		 132
133 // Return the .rela.plt section data.
134 Reloc_section*
135 rela_plt()
136 { return this->rel_; }
137
138 // Return where the TLSDESC relocations should go.
139 Reloc_section*
140 rela_tlsdesc(Layout*);
141
67181c72
ILT		 142 // Return where the IRELATIVE relocations should go in the PLT
143 // relocations.
144 Reloc_section*
145 rela_irelative(Symbol_table*, Layout*);
146
147 // Return whether we created a section for IRELATIVE relocations.
148 bool
149 has_irelative_section() const
150 { return this->irelative_rel_ != NULL; }
151
7223e9ca
ILT		 152 // Return the number of PLT entries.
153 unsigned int
154 entry_count() const
67181c72 155 { return this->count_ + this->irelative_count_; }
7223e9ca
ILT		 156
157 // Return the offset of the first non-reserved PLT entry.
2e702c99 158 unsigned int
7223e9ca 159 first_plt_entry_offset()
2e702c99 160 { return this->get_plt_entry_size(); }
7223e9ca
ILT		 161
162 // Return the size of a PLT entry.
2e702c99
RM		 163 unsigned int
164 get_plt_entry_size() const
165 { return this->do_get_plt_entry_size(); }
7223e9ca 166
4829d394
CC		 167 // Reserve a slot in the PLT for an existing symbol in an incremental update.
168 void
169 reserve_slot(unsigned int plt_index)
170 {
2e702c99
RM		 171 this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(),
172 (plt_index + 2) * this->get_plt_entry_size());
4829d394
CC		 173 }
174
67181c72
ILT		 175 // Return the PLT address to use for a global symbol.
176 uint64_t
177 address_for_global(const Symbol*);
178
179 // Return the PLT address to use for a local symbol.
180 uint64_t
181 address_for_local(const Relobj*, unsigned int symndx);
182
2e702c99
RM		 183 // Add .eh_frame information for the PLT.
184 void
185 add_eh_frame(Layout* layout)
186 { this->do_add_eh_frame(layout); }
187
7223e9ca 188 protected:
2e702c99
RM		 189 // Fill in the first PLT entry.
190 void
191 fill_first_plt_entry(unsigned char* pov,
192 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
193 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
194 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
195
196 // Fill in a normal PLT entry. Returns the offset into the entry that
197 // should be the initial GOT slot value.
198 unsigned int
199 fill_plt_entry(unsigned char* pov,
200 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
201 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
202 unsigned int got_offset,
203 unsigned int plt_offset,
204 unsigned int plt_index)
205 {
206 return this->do_fill_plt_entry(pov, got_address, plt_address,
207 got_offset, plt_offset, plt_index);
208 }
209
210 // Fill in the reserved TLSDESC PLT entry.
211 void
212 fill_tlsdesc_entry(unsigned char* pov,
213 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
214 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
215 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
216 unsigned int tlsdesc_got_offset,
217 unsigned int plt_offset)
218 {
219 this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
220 tlsdesc_got_offset, plt_offset);
221 }
222
223 virtual unsigned int
224 do_get_plt_entry_size() const = 0;
225
226 virtual void
227 do_fill_first_plt_entry(unsigned char* pov,
228 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
229 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
230 = 0;
231
232 virtual unsigned int
233 do_fill_plt_entry(unsigned char* pov,
234 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
235 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
236 unsigned int got_offset,
237 unsigned int plt_offset,
238 unsigned int plt_index) = 0;
239
240 virtual void
241 do_fill_tlsdesc_entry(unsigned char* pov,
242 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
243 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
244 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
245 unsigned int tlsdesc_got_offset,
246 unsigned int plt_offset) = 0;
247
248 virtual void
249 do_add_eh_frame(Layout* layout) = 0;
250
7223e9ca
ILT		 251 void
252 do_adjust_output_section(Output_section* os);
253
254 // Write to a map file.
255 void
256 do_print_to_mapfile(Mapfile* mapfile) const
257 { mapfile->print_output_data(this, _("** PLT")); }
258
2e702c99 259 // The CIE of the .eh_frame unwind information for the PLT.
07a60597 260 static const int plt_eh_frame_cie_size = 16;
07a60597 261 static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
7223e9ca 262
2e702c99 263 private:
7223e9ca
ILT		 264 // Set the final size.
265 void
266 set_final_data_size();
267
268 // Write out the PLT data.
269 void
270 do_write(Output_file*);
271
7d172687
ILT		 272 // A pointer to the Layout class, so that we can find the .dynamic
273 // section when we write out the GOT PLT section.
274 Layout* layout_;
7223e9ca
ILT		 275 // The reloc section.
276 Reloc_section* rel_;
277 // The TLSDESC relocs, if necessary. These must follow the regular
278 // PLT relocs.
279 Reloc_section* tlsdesc_rel_;
67181c72
ILT		 280 // The IRELATIVE relocs, if necessary. These must follow the
281 // regular PLT relocations and the TLSDESC relocations.
282 Reloc_section* irelative_rel_;
7223e9ca
ILT		 283 // The .got section.
284 Output_data_got<64, false>* got_;
285 // The .got.plt section.
286 Output_data_space* got_plt_;
67181c72
ILT		 287 // The part of the .got.plt section used for IRELATIVE relocs.
288 Output_data_space* got_irelative_;
7223e9ca
ILT		 289 // The number of PLT entries.
290 unsigned int count_;
67181c72
ILT		 291 // Number of PLT entries with R_X86_64_IRELATIVE relocs. These
292 // follow the regular PLT entries.
293 unsigned int irelative_count_;
7223e9ca
ILT		 294 // Offset of the reserved TLSDESC_GOT entry when needed.
295 unsigned int tlsdesc_got_offset_;
4829d394
CC		 296 // List of available regions within the section, for incremental
297 // update links.
298 Free_list free_list_;
7223e9ca 299};
2e30d253 300
2e702c99
RM		 301template<int size>
302class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
303{
304 public:
305 Output_data_plt_x86_64_standard(Layout* layout,
306 Output_data_got<64, false>* got,
307 Output_data_space* got_plt,
308 Output_data_space* got_irelative)
309 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
310 got, got_plt, got_irelative)
311 { }
312
313 Output_data_plt_x86_64_standard(Layout* layout,
314 Output_data_got<64, false>* got,
315 Output_data_space* got_plt,
316 Output_data_space* got_irelative,
317 unsigned int plt_count)
318 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
319 got, got_plt, got_irelative,
320 plt_count)
321 { }
322
323 protected:
324 virtual unsigned int
325 do_get_plt_entry_size() const
326 { return plt_entry_size; }
327
328 virtual void
329 do_add_eh_frame(Layout* layout)
330 {
331 layout->add_eh_frame_for_plt(this,
332 this->plt_eh_frame_cie,
333 this->plt_eh_frame_cie_size,
334 plt_eh_frame_fde,
335 plt_eh_frame_fde_size);
336 }
337
338 virtual void
339 do_fill_first_plt_entry(unsigned char* pov,
340 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
341 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
342
343 virtual unsigned int
344 do_fill_plt_entry(unsigned char* pov,
345 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
346 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
347 unsigned int got_offset,
348 unsigned int plt_offset,
349 unsigned int plt_index);
350
351 virtual void
352 do_fill_tlsdesc_entry(unsigned char* pov,
353 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
354 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
355 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
356 unsigned int tlsdesc_got_offset,
357 unsigned int plt_offset);
358
359 private:
360 // The size of an entry in the PLT.
361 static const int plt_entry_size = 16;
362
363 // The first entry in the PLT.
364 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
365 // procedure linkage table for both programs and shared objects."
366 static const unsigned char first_plt_entry[plt_entry_size];
367
368 // Other entries in the PLT for an executable.
369 static const unsigned char plt_entry[plt_entry_size];
370
371 // The reserved TLSDESC entry in the PLT for an executable.
372 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
373
374 // The .eh_frame unwind information for the PLT.
375 static const int plt_eh_frame_fde_size = 32;
376 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
377};
378
2e30d253 379// The x86_64 target class.
d61c17ea
ILT		 380// See the ABI at
381// http://www.x86-64.org/documentation/abi.pdf
382// TLS info comes from
383// http://people.redhat.com/drepper/tls.pdf
0ffd9845 384// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
2e30d253 385
fc51264f
L		 386template<int size>
387class Target_x86_64 : public Sized_target<size, false>
2e30d253
ILT		 388{
389 public:
e822f2b1
ILT		 390 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
391 // uses only Elf64_Rela relocation entries with explicit addends."
fc51264f 392 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
2e30d253 393
2e702c99
RM		 394 Target_x86_64(const Target::Target_info* info = &x86_64_info)
395 : Sized_target<size, false>(info),
67181c72
ILT		 396 got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
397 got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
398 rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
399 dynbss_(NULL), got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
e291e7b9 400 tls_base_symbol_defined_(false)
2e30d253
ILT		 401 { }
402
8a5e3e08
ILT		 403 // Hook for a new output section.
404 void
405 do_new_output_section(Output_section*) const;
406
6d03d481
ST		 407 // Scan the relocations to look for symbol adjustments.
408 void
ad0f2072 409 gc_process_relocs(Symbol_table* symtab,
2e702c99
RM		 410 Layout* layout,
411 Sized_relobj_file<size, false>* object,
412 unsigned int data_shndx,
413 unsigned int sh_type,
414 const unsigned char* prelocs,
415 size_t reloc_count,
416 Output_section* output_section,
417 bool needs_special_offset_handling,
418 size_t local_symbol_count,
419 const unsigned char* plocal_symbols);
6d03d481 420
2e30d253
ILT		 421 // Scan the relocations to look for symbol adjustments.
422 void
ad0f2072 423 scan_relocs(Symbol_table* symtab,
2e30d253 424 Layout* layout,
fc51264f 425 Sized_relobj_file<size, false>* object,
2e30d253
ILT		 426 unsigned int data_shndx,
427 unsigned int sh_type,
428 const unsigned char* prelocs,
429 size_t reloc_count,
730cdc88
ILT		 430 Output_section* output_section,
431 bool needs_special_offset_handling,
2e30d253 432 size_t local_symbol_count,
730cdc88 433 const unsigned char* plocal_symbols);
2e30d253
ILT		 434
435 // Finalize the sections.
436 void
f59f41f3 437 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2e30d253 438
4fb6c25d
ILT		 439 // Return the value to use for a dynamic which requires special
440 // treatment.
441 uint64_t
442 do_dynsym_value(const Symbol*) const;
443
2e30d253
ILT		 444 // Relocate a section.
445 void
fc51264f 446 relocate_section(const Relocate_info<size, false>*,
2e30d253
ILT		 447 unsigned int sh_type,
448 const unsigned char* prelocs,
449 size_t reloc_count,
730cdc88
ILT		 450 Output_section* output_section,
451 bool needs_special_offset_handling,
2e30d253 452 unsigned char* view,
fc51264f 453 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
364c7fa5
ILT		 454 section_size_type view_size,
455 const Reloc_symbol_changes*);
2e30d253 456
6a74a719
ILT		 457 // Scan the relocs during a relocatable link.
458 void
ad0f2072 459 scan_relocatable_relocs(Symbol_table* symtab,
6a74a719 460 Layout* layout,
fc51264f 461 Sized_relobj_file<size, false>* object,
6a74a719
ILT		 462 unsigned int data_shndx,
463 unsigned int sh_type,
464 const unsigned char* prelocs,
465 size_t reloc_count,
466 Output_section* output_section,
467 bool needs_special_offset_handling,
468 size_t local_symbol_count,
469 const unsigned char* plocal_symbols,
470 Relocatable_relocs*);
471
472 // Relocate a section during a relocatable link.
473 void
fc51264f
L		 474 relocate_for_relocatable(
475 const Relocate_info<size, false>*,
476 unsigned int sh_type,
477 const unsigned char* prelocs,
478 size_t reloc_count,
479 Output_section* output_section,
480 off_t offset_in_output_section,
481 const Relocatable_relocs*,
482 unsigned char* view,
483 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
484 section_size_type view_size,
485 unsigned char* reloc_view,
486 section_size_type reloc_view_size);
6a74a719 487
2e30d253
ILT		 488 // Return a string used to fill a code section with nops.
489 std::string
8851ecca 490 do_code_fill(section_size_type length) const;
2e30d253 491
9a2d6984
ILT		 492 // Return whether SYM is defined by the ABI.
493 bool
9c2d0ef9 494 do_is_defined_by_abi(const Symbol* sym) const
9a2d6984
ILT		 495 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
496
e291e7b9
ILT		 497 // Return the symbol index to use for a target specific relocation.
498 // The only target specific relocation is R_X86_64_TLSDESC for a
499 // local symbol, which is an absolute reloc.
500 unsigned int
501 do_reloc_symbol_index(void*, unsigned int r_type) const
502 {
503 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
504 return 0;
505 }
506
507 // Return the addend to use for a target specific relocation.
508 uint64_t
509 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
510
7223e9ca 511 // Return the PLT section.
67181c72
ILT		 512 uint64_t
513 do_plt_address_for_global(const Symbol* gsym) const
514 { return this->plt_section()->address_for_global(gsym); }
7223e9ca 515
67181c72
ILT		 516 uint64_t
517 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
518 { return this->plt_section()->address_for_local(relobj, symndx); }
7223e9ca 519
b3ce541e
ILT		 520 // This function should be defined in targets that can use relocation
521 // types to determine (implemented in local_reloc_may_be_function_pointer
522 // and global_reloc_may_be_function_pointer)
523 // if a function's pointer is taken. ICF uses this in safe mode to only
524 // fold those functions whose pointer is defintely not taken. For x86_64
525 // pie binaries, safe ICF cannot be done by looking at relocation types.
526 bool
527 do_can_check_for_function_pointers() const
528 { return !parameters->options().pie(); }
529
02d7cd44
ILT		 530 // Return the base for a DW_EH_PE_datarel encoding.
531 uint64_t
532 do_ehframe_datarel_base() const;
533
9b547ce6 534 // Adjust -fsplit-stack code which calls non-split-stack code.
364c7fa5
ILT		 535 void
536 do_calls_non_split(Relobj* object, unsigned int shndx,
537 section_offset_type fnoffset, section_size_type fnsize,
538 unsigned char* view, section_size_type view_size,
539 std::string* from, std::string* to) const;
540
96f2030e 541 // Return the size of the GOT section.
fe8718a4 542 section_size_type
0e70b911 543 got_size() const
96f2030e
ILT		 544 {
545 gold_assert(this->got_ != NULL);
546 return this->got_->data_size();
547 }
548
0e70b911
CC		 549 // Return the number of entries in the GOT.
550 unsigned int
551 got_entry_count() const
552 {
553 if (this->got_ == NULL)
554 return 0;
555 return this->got_size() / 8;
556 }
557
558 // Return the number of entries in the PLT.
559 unsigned int
560 plt_entry_count() const;
561
562 // Return the offset of the first non-reserved PLT entry.
563 unsigned int
564 first_plt_entry_offset() const;
565
566 // Return the size of each PLT entry.
567 unsigned int
568 plt_entry_size() const;
569
4829d394 570 // Create the GOT section for an incremental update.
dd74ae06 571 Output_data_got_base*
4829d394
CC		 572 init_got_plt_for_update(Symbol_table* symtab,
573 Layout* layout,
574 unsigned int got_count,
575 unsigned int plt_count);
576
6fa2a40b
CC		 577 // Reserve a GOT entry for a local symbol, and regenerate any
578 // necessary dynamic relocations.
579 void
580 reserve_local_got_entry(unsigned int got_index,
2e702c99 581 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 582 unsigned int r_sym,
583 unsigned int got_type);
584
585 // Reserve a GOT entry for a global symbol, and regenerate any
586 // necessary dynamic relocations.
587 void
588 reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
589 unsigned int got_type);
590
4829d394 591 // Register an existing PLT entry for a global symbol.
4829d394 592 void
67181c72
ILT		 593 register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
594 Symbol* gsym);
4829d394 595
26d3c67d
CC		 596 // Force a COPY relocation for a given symbol.
597 void
598 emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
599
94a3fc8b
CC		 600 // Apply an incremental relocation.
601 void
fc51264f
L		 602 apply_relocation(const Relocate_info<size, false>* relinfo,
603 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 604 unsigned int r_type,
fc51264f 605 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 606 const Symbol* gsym,
607 unsigned char* view,
fc51264f 608 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 609 section_size_type view_size);
610
e291e7b9
ILT		 611 // Add a new reloc argument, returning the index in the vector.
612 size_t
fc51264f 613 add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
e291e7b9
ILT		 614 {
615 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
616 return this->tlsdesc_reloc_info_.size() - 1;
617 }
618
2e702c99
RM		 619 Output_data_plt_x86_64<size>*
620 make_data_plt(Layout* layout,
621 Output_data_got<64, false>* got,
622 Output_data_space* got_plt,
623 Output_data_space* got_irelative)
624 {
625 return this->do_make_data_plt(layout, got, got_plt, got_irelative);
626 }
627
628 Output_data_plt_x86_64<size>*
629 make_data_plt(Layout* layout,
630 Output_data_got<64, false>* got,
631 Output_data_space* got_plt,
632 Output_data_space* got_irelative,
633 unsigned int plt_count)
634 {
635 return this->do_make_data_plt(layout, got, got_plt, got_irelative,
636 plt_count);
637 }
638
639 virtual Output_data_plt_x86_64<size>*
640 do_make_data_plt(Layout* layout,
641 Output_data_got<64, false>* got,
642 Output_data_space* got_plt,
643 Output_data_space* got_irelative)
644 {
645 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
646 got_irelative);
647 }
648
649 virtual Output_data_plt_x86_64<size>*
650 do_make_data_plt(Layout* layout,
651 Output_data_got<64, false>* got,
652 Output_data_space* got_plt,
653 Output_data_space* got_irelative,
654 unsigned int plt_count)
655 {
656 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
657 got_irelative,
658 plt_count);
659 }
660
2e30d253
ILT		 661 private:
662 // The class which scans relocations.
a036edd8 663 class Scan
2e30d253 664 {
a036edd8
ILT		 665 public:
666 Scan()
667 : issued_non_pic_error_(false)
668 { }
669
95a2c8d6
RS		 670 static inline int
671 get_reference_flags(unsigned int r_type);
672
2e30d253 673 inline void
ad0f2072 674 local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 675 Sized_relobj_file<size, false>* object,
2e30d253 676 unsigned int data_shndx,
07f397ab 677 Output_section* output_section,
fc51264f
L		 678 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
679 const elfcpp::Sym<size, false>& lsym);
2e30d253
ILT		 680
681 inline void
ad0f2072 682 global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 683 Sized_relobj_file<size, false>* object,
2e30d253 684 unsigned int data_shndx,
07f397ab 685 Output_section* output_section,
fc51264f 686 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
2e30d253 687 Symbol* gsym);
e041f13d 688
21bb3914
ST		 689 inline bool
690 local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
691 Target_x86_64* target,
2e702c99
RM		 692 Sized_relobj_file<size, false>* object,
693 unsigned int data_shndx,
694 Output_section* output_section,
695 const elfcpp::Rela<size, false>& reloc,
21bb3914 696 unsigned int r_type,
2e702c99 697 const elfcpp::Sym<size, false>& lsym);
21bb3914
ST		 698
699 inline bool
700 global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
2e702c99
RM		 701 Target_x86_64* target,
702 Sized_relobj_file<size, false>* object,
703 unsigned int data_shndx,
704 Output_section* output_section,
705 const elfcpp::Rela<size, false>& reloc,
21bb3914 706 unsigned int r_type,
2e702c99 707 Symbol* gsym);
21bb3914 708
a036edd8 709 private:
e041f13d 710 static void
fc51264f
L		 711 unsupported_reloc_local(Sized_relobj_file<size, false>*,
712 unsigned int r_type);
e041f13d
ILT		 713
714 static void
fc51264f
L		 715 unsupported_reloc_global(Sized_relobj_file<size, false>*,
716 unsigned int r_type, Symbol*);
a036edd8
ILT		 717
718 void
a29b0dad 719 check_non_pic(Relobj*, unsigned int r_type, Symbol*);
a036edd8 720
21bb3914
ST		 721 inline bool
722 possible_function_pointer_reloc(unsigned int r_type);
723
7223e9ca 724 bool
fc51264f 725 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
6fa2a40b 726 unsigned int r_type);
7223e9ca 727
a036edd8
ILT		 728 // Whether we have issued an error about a non-PIC compilation.
729 bool issued_non_pic_error_;
2e30d253
ILT		 730 };
731
732 // The class which implements relocation.
733 class Relocate
734 {
735 public:
736 Relocate()
36171d64 737 : skip_call_tls_get_addr_(false)
2e30d253
ILT		 738 { }
739
740 ~Relocate()
741 {
742 if (this->skip_call_tls_get_addr_)
743 {
744 // FIXME: This needs to specify the location somehow.
a0c4fb0a 745 gold_error(_("missing expected TLS relocation"));
2e30d253
ILT		 746 }
747 }
748
749 // Do a relocation. Return false if the caller should not issue
750 // any warnings about this relocation.
751 inline bool
fc51264f
L		 752 relocate(const Relocate_info<size, false>*, Target_x86_64*,
753 Output_section*,
754 size_t relnum, const elfcpp::Rela<size, false>&,
755 unsigned int r_type, const Sized_symbol<size>*,
756 const Symbol_value<size>*,
757 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 758 section_size_type);
2e30d253
ILT		 759
760 private:
761 // Do a TLS relocation.
762 inline void
fc51264f 763 relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
2e702c99 764 size_t relnum, const elfcpp::Rela<size, false>&,
fc51264f
L		 765 unsigned int r_type, const Sized_symbol<size>*,
766 const Symbol_value<size>*,
767 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 768 section_size_type);
2e30d253 769
c2b45e22 770 // Do a TLS General-Dynamic to Initial-Exec transition.
7bf1f802 771 inline void
fc51264f 772 tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
7bf1f802 773 Output_segment* tls_segment,
fc51264f
L		 774 const elfcpp::Rela<size, false>&, unsigned int r_type,
775 typename elfcpp::Elf_types<size>::Elf_Addr value,
7bf1f802 776 unsigned char* view,
fc51264f 777 typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 778 section_size_type view_size);
7bf1f802 779
56622147
ILT		 780 // Do a TLS General-Dynamic to Local-Exec transition.
781 inline void
fc51264f 782 tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 783 Output_segment* tls_segment,
fc51264f
L		 784 const elfcpp::Rela<size, false>&, unsigned int r_type,
785 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 786 unsigned char* view,
fe8718a4 787 section_size_type view_size);
2e30d253 788
c2b45e22
CC		 789 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
790 inline void
fc51264f 791 tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
c2b45e22 792 Output_segment* tls_segment,
fc51264f
L		 793 const elfcpp::Rela<size, false>&, unsigned int r_type,
794 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 795 unsigned char* view,
fc51264f 796 typename elfcpp::Elf_types<size>::Elf_Addr,
c2b45e22
CC		 797 section_size_type view_size);
798
799 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
800 inline void
fc51264f 801 tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
c2b45e22 802 Output_segment* tls_segment,
fc51264f
L		 803 const elfcpp::Rela<size, false>&, unsigned int r_type,
804 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 805 unsigned char* view,
806 section_size_type view_size);
807
56622147 808 // Do a TLS Local-Dynamic to Local-Exec transition.
2e30d253 809 inline void
fc51264f 810 tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 811 Output_segment* tls_segment,
fc51264f
L		 812 const elfcpp::Rela<size, false>&, unsigned int r_type,
813 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 814 unsigned char* view,
fe8718a4 815 section_size_type view_size);
2e30d253 816
56622147
ILT		 817 // Do a TLS Initial-Exec to Local-Exec transition.
818 static inline void
fc51264f 819 tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
72ec2876 820 Output_segment* tls_segment,
fc51264f
L		 821 const elfcpp::Rela<size, false>&, unsigned int r_type,
822 typename elfcpp::Elf_types<size>::Elf_Addr value,
72ec2876 823 unsigned char* view,
fe8718a4 824 section_size_type view_size);
2e30d253
ILT		 825
826 // This is set if we should skip the next reloc, which should be a
827 // PLT32 reloc against ___tls_get_addr.
828 bool skip_call_tls_get_addr_;
829 };
830
6a74a719
ILT		 831 // A class which returns the size required for a relocation type,
832 // used while scanning relocs during a relocatable link.
833 class Relocatable_size_for_reloc
834 {
835 public:
836 unsigned int
837 get_size_for_reloc(unsigned int, Relobj*);
838 };
839
2e30d253
ILT		 840 // Adjust TLS relocation type based on the options and whether this
841 // is a local symbol.
e041f13d 842 static tls::Tls_optimization
2e30d253
ILT		 843 optimize_tls_reloc(bool is_final, int r_type);
844
845 // Get the GOT section, creating it if necessary.
846 Output_data_got<64, false>*
847 got_section(Symbol_table*, Layout*);
848
96f2030e
ILT		 849 // Get the GOT PLT section.
850 Output_data_space*
851 got_plt_section() const
852 {
853 gold_assert(this->got_plt_ != NULL);
854 return this->got_plt_;
855 }
856
a8df5856
ILT		 857 // Get the GOT section for TLSDESC entries.
858 Output_data_got<64, false>*
859 got_tlsdesc_section() const
860 {
861 gold_assert(this->got_tlsdesc_ != NULL);
862 return this->got_tlsdesc_;
863 }
864
c2b45e22
CC		 865 // Create the PLT section.
866 void
867 make_plt_section(Symbol_table* symtab, Layout* layout);
868
2e30d253
ILT		 869 // Create a PLT entry for a global symbol.
870 void
871 make_plt_entry(Symbol_table*, Layout*, Symbol*);
872
7223e9ca
ILT		 873 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
874 void
875 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
fc51264f 876 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 877 unsigned int local_sym_index);
878
9fa33bee 879 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 880 void
881 define_tls_base_symbol(Symbol_table*, Layout*);
882
c2b45e22
CC		 883 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
884 void
885 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
886
31d60480
ILT		 887 // Create a GOT entry for the TLS module index.
888 unsigned int
889 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
fc51264f 890 Sized_relobj_file<size, false>* object);
31d60480 891
2e30d253 892 // Get the PLT section.
fc51264f 893 Output_data_plt_x86_64<size>*
2e30d253
ILT		 894 plt_section() const
895 {
896 gold_assert(this->plt_ != NULL);
897 return this->plt_;
898 }
899
900 // Get the dynamic reloc section, creating it if necessary.
901 Reloc_section*
0ffd9845 902 rela_dyn_section(Layout*);
2e30d253 903
e291e7b9
ILT		 904 // Get the section to use for TLSDESC relocations.
905 Reloc_section*
906 rela_tlsdesc_section(Layout*) const;
907
67181c72
ILT		 908 // Get the section to use for IRELATIVE relocations.
909 Reloc_section*
910 rela_irelative_section(Layout*);
911
12c0daef 912 // Add a potential copy relocation.
2e30d253 913 void
ef9beddf 914 copy_reloc(Symbol_table* symtab, Layout* layout,
2e702c99 915 Sized_relobj_file<size, false>* object,
12c0daef 916 unsigned int shndx, Output_section* output_section,
fc51264f 917 Symbol* sym, const elfcpp::Rela<size, false>& reloc)
12c0daef
ILT		 918 {
919 this->copy_relocs_.copy_reloc(symtab, layout,
fc51264f 920 symtab->get_sized_symbol<size>(sym),
12c0daef
ILT		 921 object, shndx, output_section,
922 reloc, this->rela_dyn_section(layout));
923 }
2e30d253
ILT		 924
925 // Information about this specific target which we pass to the
926 // general Target structure.
927 static const Target::Target_info x86_64_info;
928
0e70b911
CC		 929 // The types of GOT entries needed for this platform.
930 // These values are exposed to the ABI in an incremental link.
931 // Do not renumber existing values without changing the version
932 // number of the .gnu_incremental_inputs section.
0a65a3a7
CC		 933 enum Got_type
934 {
935 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
936 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
937 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
938 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
939 };
940
e291e7b9
ILT		 941 // This type is used as the argument to the target specific
942 // relocation routines. The only target specific reloc is
943 // R_X86_64_TLSDESC against a local symbol.
944 struct Tlsdesc_info
945 {
fc51264f 946 Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
e291e7b9
ILT		 947 : object(a_object), r_sym(a_r_sym)
948 { }
949
950 // The object in which the local symbol is defined.
fc51264f 951 Sized_relobj_file<size, false>* object;
e291e7b9
ILT		 952 // The local symbol index in the object.
953 unsigned int r_sym;
954 };
955
2e30d253
ILT		 956 // The GOT section.
957 Output_data_got<64, false>* got_;
958 // The PLT section.
fc51264f 959 Output_data_plt_x86_64<size>* plt_;
2e30d253
ILT		 960 // The GOT PLT section.
961 Output_data_space* got_plt_;
67181c72
ILT		 962 // The GOT section for IRELATIVE relocations.
963 Output_data_space* got_irelative_;
a8df5856
ILT		 964 // The GOT section for TLSDESC relocations.
965 Output_data_got<64, false>* got_tlsdesc_;
e785ec03
ILT		 966 // The _GLOBAL_OFFSET_TABLE_ symbol.
967 Symbol* global_offset_table_;
2e30d253 968 // The dynamic reloc section.
0ffd9845 969 Reloc_section* rela_dyn_;
67181c72
ILT		 970 // The section to use for IRELATIVE relocs.
971 Reloc_section* rela_irelative_;
2e30d253 972 // Relocs saved to avoid a COPY reloc.
fc51264f 973 Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
2e30d253
ILT		 974 // Space for variables copied with a COPY reloc.
975 Output_data_space* dynbss_;
c2b45e22 976 // Offset of the GOT entry for the TLS module index.
31d60480 977 unsigned int got_mod_index_offset_;
e291e7b9
ILT		 978 // We handle R_X86_64_TLSDESC against a local symbol as a target
979 // specific relocation. Here we store the object and local symbol
980 // index for the relocation.
981 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
edfbb029
CC		 982 // True if the _TLS_MODULE_BASE_ symbol has been defined.
983 bool tls_base_symbol_defined_;
2e30d253
ILT		 984};
985
fc51264f
L		 986template<>
987const Target::Target_info Target_x86_64<64>::x86_64_info =
2e30d253
ILT		 988{
989 64, // size
990 false, // is_big_endian
991 elfcpp::EM_X86_64, // machine_code
992 false, // has_make_symbol
993 false, // has_resolve
994 true, // has_code_fill
35cdfc9a 995 true, // is_default_stack_executable
b3ce541e 996 true, // can_icf_inline_merge_sections
0864d551 997 '\0', // wrap_char
2e30d253 998 "/lib/ld64.so.1", // program interpreter
0c5e9c22 999 0x400000, // default_text_segment_address
cd72c291 1000 0x1000, // abi_pagesize (overridable by -z max-page-size)
8a5e3e08 1001 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1002 false, // isolate_execinstr
1003 0, // rosegment_gap
8a5e3e08
ILT		 1004 elfcpp::SHN_UNDEF, // small_common_shndx
1005 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1006 0, // small_common_section_flags
05a352e6
DK		 1007 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1008 NULL, // attributes_section
1009 NULL // attributes_vendor
2e30d253
ILT		 1010};
1011
fc51264f
L		 1012template<>
1013const Target::Target_info Target_x86_64<32>::x86_64_info =
1014{
1015 32, // size
1016 false, // is_big_endian
1017 elfcpp::EM_X86_64, // machine_code
1018 false, // has_make_symbol
1019 false, // has_resolve
1020 true, // has_code_fill
1021 true, // is_default_stack_executable
1022 true, // can_icf_inline_merge_sections
1023 '\0', // wrap_char
1024 "/libx32/ldx32.so.1", // program interpreter
1025 0x400000, // default_text_segment_address
1026 0x1000, // abi_pagesize (overridable by -z max-page-size)
1027 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1028 false, // isolate_execinstr
1029 0, // rosegment_gap
fc51264f
L		 1030 elfcpp::SHN_UNDEF, // small_common_shndx
1031 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1032 0, // small_common_section_flags
1033 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1034 NULL, // attributes_section
1035 NULL // attributes_vendor
1036};
1037
8a5e3e08
ILT		 1038// This is called when a new output section is created. This is where
1039// we handle the SHF_X86_64_LARGE.
1040
fc51264f 1041template<int size>
8a5e3e08 1042void
fc51264f 1043Target_x86_64<size>::do_new_output_section(Output_section* os) const
8a5e3e08
ILT		 1044{
1045 if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1046 os->set_is_large_section();
1047}
1048
2e30d253
ILT		 1049// Get the GOT section, creating it if necessary.
1050
fc51264f 1051template<int size>
2e30d253 1052Output_data_got<64, false>*
fc51264f 1053Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
2e30d253
ILT		 1054{
1055 if (this->got_ == NULL)
1056 {
1057 gold_assert(symtab != NULL && layout != NULL);
1058
9446efde
ILT		 1059 // When using -z now, we can treat .got.plt as a relro section.
1060 // Without -z now, it is modified after program startup by lazy
1061 // PLT relocations.
1062 bool is_got_plt_relro = parameters->options().now();
1063 Output_section_order got_order = (is_got_plt_relro
1064 ? ORDER_RELRO
1065 : ORDER_RELRO_LAST);
1066 Output_section_order got_plt_order = (is_got_plt_relro
1067 ? ORDER_RELRO
1068 : ORDER_NON_RELRO_FIRST);
1069
2e30d253
ILT		 1070 this->got_ = new Output_data_got<64, false>();
1071
82742395
ILT		 1072 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1073 (elfcpp::SHF_ALLOC
1074 | elfcpp::SHF_WRITE),
9446efde 1075 this->got_, got_order, true);
2e30d253 1076
7d9e3d98 1077 this->got_plt_ = new Output_data_space(8, "** GOT PLT");
82742395
ILT		 1078 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1079 (elfcpp::SHF_ALLOC
1080 | elfcpp::SHF_WRITE),
9446efde
ILT		 1081 this->got_plt_, got_plt_order,
1082 is_got_plt_relro);
2e30d253
ILT		 1083
1084 // The first three entries are reserved.
27bc2bce 1085 this->got_plt_->set_current_data_size(3 * 8);
2e30d253 1086
9446efde
ILT		 1087 if (!is_got_plt_relro)
1088 {
1089 // Those bytes can go into the relro segment.
1090 layout->increase_relro(3 * 8);
1091 }
1a2dff53 1092
2e30d253 1093 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
e785ec03
ILT		 1094 this->global_offset_table_ =
1095 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1096 Symbol_table::PREDEFINED,
1097 this->got_plt_,
1098 0, 0, elfcpp::STT_OBJECT,
1099 elfcpp::STB_LOCAL,
1100 elfcpp::STV_HIDDEN, 0,
1101 false, false);
a8df5856 1102
67181c72
ILT		 1103 // If there are any IRELATIVE relocations, they get GOT entries
1104 // in .got.plt after the jump slot entries.
1105 this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1106 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1107 (elfcpp::SHF_ALLOC
1108 | elfcpp::SHF_WRITE),
1109 this->got_irelative_,
9446efde 1110 got_plt_order, is_got_plt_relro);
67181c72 1111
a8df5856 1112 // If there are any TLSDESC relocations, they get GOT entries in
67181c72 1113 // .got.plt after the jump slot and IRELATIVE entries.
a8df5856
ILT		 1114 this->got_tlsdesc_ = new Output_data_got<64, false>();
1115 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1116 (elfcpp::SHF_ALLOC
1117 | elfcpp::SHF_WRITE),
22f0da72 1118 this->got_tlsdesc_,
9446efde 1119 got_plt_order, is_got_plt_relro);
2e30d253
ILT		 1120 }
1121
1122 return this->got_;
1123}
1124
1125// Get the dynamic reloc section, creating it if necessary.
1126
fc51264f
L		 1127template<int size>
1128typename Target_x86_64<size>::Reloc_section*
1129Target_x86_64<size>::rela_dyn_section(Layout* layout)
2e30d253 1130{
0ffd9845 1131 if (this->rela_dyn_ == NULL)
2e30d253
ILT		 1132 {
1133 gold_assert(layout != NULL);
d98bc257 1134 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
2e30d253 1135 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
22f0da72
ILT		 1136 elfcpp::SHF_ALLOC, this->rela_dyn_,
1137 ORDER_DYNAMIC_RELOCS, false);
2e30d253 1138 }
0ffd9845 1139 return this->rela_dyn_;
2e30d253
ILT		 1140}
1141
67181c72
ILT		 1142// Get the section to use for IRELATIVE relocs, creating it if
1143// necessary. These go in .rela.dyn, but only after all other dynamic
1144// relocations. They need to follow the other dynamic relocations so
1145// that they can refer to global variables initialized by those
1146// relocs.
1147
fc51264f
L		 1148template<int size>
1149typename Target_x86_64<size>::Reloc_section*
1150Target_x86_64<size>::rela_irelative_section(Layout* layout)
67181c72
ILT		 1151{
1152 if (this->rela_irelative_ == NULL)
1153 {
1154 // Make sure we have already created the dynamic reloc section.
1155 this->rela_dyn_section(layout);
1156 this->rela_irelative_ = new Reloc_section(false);
1157 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1158 elfcpp::SHF_ALLOC, this->rela_irelative_,
1159 ORDER_DYNAMIC_RELOCS, false);
1160 gold_assert(this->rela_dyn_->output_section()
1161 == this->rela_irelative_->output_section());
1162 }
1163 return this->rela_irelative_;
1164}
1165
4829d394 1166// Initialize the PLT section.
2e30d253 1167
fc51264f 1168template<int size>
4829d394 1169void
fc51264f 1170Output_data_plt_x86_64<size>::init(Layout* layout)
2e30d253 1171{
d98bc257 1172 this->rel_ = new Reloc_section(false);
2e30d253 1173 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
22f0da72
ILT		 1174 elfcpp::SHF_ALLOC, this->rel_,
1175 ORDER_DYNAMIC_PLT_RELOCS, false);
2e30d253
ILT		 1176}
1177
fc51264f 1178template<int size>
2e30d253 1179void
fc51264f 1180Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
2e30d253 1181{
2e702c99 1182 os->set_entsize(this->get_plt_entry_size());
2e30d253
ILT		 1183}
1184
1185// Add an entry to the PLT.
1186
fc51264f 1187template<int size>
2e30d253 1188void
fc51264f
L		 1189Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1190 Symbol* gsym)
2e30d253
ILT		 1191{
1192 gold_assert(!gsym->has_plt_offset());
1193
4829d394
CC		 1194 unsigned int plt_index;
1195 off_t plt_offset;
1196 section_offset_type got_offset;
2e30d253 1197
67181c72
ILT		 1198 unsigned int* pcount;
1199 unsigned int offset;
1200 unsigned int reserved;
1201 Output_data_space* got;
1202 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1203 && gsym->can_use_relative_reloc(false))
1204 {
1205 pcount = &this->irelative_count_;
1206 offset = 0;
1207 reserved = 0;
1208 got = this->got_irelative_;
1209 }
1210 else
1211 {
1212 pcount = &this->count_;
1213 offset = 1;
1214 reserved = 3;
1215 got = this->got_plt_;
1216 }
1217
4829d394
CC		 1218 if (!this->is_data_size_valid())
1219 {
67181c72
ILT		 1220 // Note that when setting the PLT offset for a non-IRELATIVE
1221 // entry we skip the initial reserved PLT entry.
1222 plt_index = *pcount + offset;
2e702c99 1223 plt_offset = plt_index * this->get_plt_entry_size();
2e30d253 1224
67181c72 1225 ++*pcount;
2e30d253 1226
67181c72
ILT		 1227 got_offset = (plt_index - offset + reserved) * 8;
1228 gold_assert(got_offset == got->current_data_size());
2e30d253 1229
4829d394
CC		 1230 // Every PLT entry needs a GOT entry which points back to the PLT
1231 // entry (this will be changed by the dynamic linker, normally
1232 // lazily when the function is called).
67181c72 1233 got->set_current_data_size(got_offset + 8);
4829d394 1234 }
7223e9ca
ILT		 1235 else
1236 {
67181c72
ILT		 1237 // FIXME: This is probably not correct for IRELATIVE relocs.
1238
4829d394 1239 // For incremental updates, find an available slot.
2e702c99
RM		 1240 plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1241 this->get_plt_entry_size(), 0);
4829d394 1242 if (plt_offset == -1)
e6455dfb
CC		 1243 gold_fallback(_("out of patch space (PLT);"
1244 " relink with --incremental-full"));
4829d394
CC		 1245
1246 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1247 // can be calculated from the PLT index, adjusting for the three
1248 // reserved entries at the beginning of the GOT.
2e702c99 1249 plt_index = plt_offset / this->get_plt_entry_size() - 1;
67181c72 1250 got_offset = (plt_index - offset + reserved) * 8;
7223e9ca 1251 }
2e30d253 1252
4829d394
CC		 1253 gsym->set_plt_offset(plt_offset);
1254
1255 // Every PLT entry needs a reloc.
67181c72 1256 this->add_relocation(symtab, layout, gsym, got_offset);
4829d394 1257
2e30d253
ILT		 1258 // Note that we don't need to save the symbol. The contents of the
1259 // PLT are independent of which symbols are used. The symbols only
1260 // appear in the relocations.
1261}
1262
7223e9ca
ILT		 1263// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1264// the PLT offset.
1265
fc51264f 1266template<int size>
7223e9ca 1267unsigned int
fc51264f 1268Output_data_plt_x86_64<size>::add_local_ifunc_entry(
67181c72
ILT		 1269 Symbol_table* symtab,
1270 Layout* layout,
fc51264f 1271 Sized_relobj_file<size, false>* relobj,
6fa2a40b 1272 unsigned int local_sym_index)
7223e9ca 1273{
2e702c99 1274 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
67181c72 1275 ++this->irelative_count_;
7223e9ca 1276
67181c72 1277 section_offset_type got_offset = this->got_irelative_->current_data_size();
7223e9ca
ILT		 1278
1279 // Every PLT entry needs a GOT entry which points back to the PLT
1280 // entry.
67181c72 1281 this->got_irelative_->set_current_data_size(got_offset + 8);
7223e9ca
ILT		 1282
1283 // Every PLT entry needs a reloc.
67181c72
ILT		 1284 Reloc_section* rela = this->rela_irelative(symtab, layout);
1285 rela->add_symbolless_local_addend(relobj, local_sym_index,
1286 elfcpp::R_X86_64_IRELATIVE,
1287 this->got_irelative_, got_offset, 0);
7223e9ca
ILT		 1288
1289 return plt_offset;
1290}
1291
4829d394
CC		 1292// Add the relocation for a PLT entry.
1293
fc51264f 1294template<int size>
4829d394 1295void
fc51264f
L		 1296Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1297 Layout* layout,
1298 Symbol* gsym,
1299 unsigned int got_offset)
4829d394
CC		 1300{
1301 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1302 && gsym->can_use_relative_reloc(false))
67181c72
ILT		 1303 {
1304 Reloc_section* rela = this->rela_irelative(symtab, layout);
1305 rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1306 this->got_irelative_, got_offset, 0);
1307 }
4829d394
CC		 1308 else
1309 {
1310 gsym->set_needs_dynsym_entry();
1311 this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1312 got_offset, 0);
1313 }
1314}
1315
e291e7b9
ILT		 1316// Return where the TLSDESC relocations should go, creating it if
1317// necessary. These follow the JUMP_SLOT relocations.
1318
fc51264f
L		 1319template<int size>
1320typename Output_data_plt_x86_64<size>::Reloc_section*
1321Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
e291e7b9
ILT		 1322{
1323 if (this->tlsdesc_rel_ == NULL)
1324 {
1325 this->tlsdesc_rel_ = new Reloc_section(false);
1326 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1327 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
22f0da72 1328 ORDER_DYNAMIC_PLT_RELOCS, false);
67181c72
ILT		 1329 gold_assert(this->tlsdesc_rel_->output_section()
1330 == this->rel_->output_section());
e291e7b9
ILT		 1331 }
1332 return this->tlsdesc_rel_;
1333}
1334
67181c72
ILT		 1335// Return where the IRELATIVE relocations should go in the PLT. These
1336// follow the JUMP_SLOT and the TLSDESC relocations.
1337
fc51264f
L		 1338template<int size>
1339typename Output_data_plt_x86_64<size>::Reloc_section*
1340Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1341 Layout* layout)
67181c72
ILT		 1342{
1343 if (this->irelative_rel_ == NULL)
1344 {
1345 // Make sure we have a place for the TLSDESC relocations, in
1346 // case we see any later on.
1347 this->rela_tlsdesc(layout);
1348 this->irelative_rel_ = new Reloc_section(false);
1349 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1350 elfcpp::SHF_ALLOC, this->irelative_rel_,
1351 ORDER_DYNAMIC_PLT_RELOCS, false);
1352 gold_assert(this->irelative_rel_->output_section()
1353 == this->rel_->output_section());
1354
1355 if (parameters->doing_static_link())
1356 {
1357 // A statically linked executable will only have a .rela.plt
1358 // section to hold R_X86_64_IRELATIVE relocs for
1359 // STT_GNU_IFUNC symbols. The library will use these
1360 // symbols to locate the IRELATIVE relocs at program startup
1361 // time.
1362 symtab->define_in_output_data("__rela_iplt_start", NULL,
1363 Symbol_table::PREDEFINED,
1364 this->irelative_rel_, 0, 0,
1365 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1366 elfcpp::STV_HIDDEN, 0, false, true);
1367 symtab->define_in_output_data("__rela_iplt_end", NULL,
1368 Symbol_table::PREDEFINED,
1369 this->irelative_rel_, 0, 0,
1370 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1371 elfcpp::STV_HIDDEN, 0, true, true);
1372 }
1373 }
1374 return this->irelative_rel_;
1375}
1376
1377// Return the PLT address to use for a global symbol.
1378
fc51264f 1379template<int size>
67181c72 1380uint64_t
fc51264f 1381Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym)
67181c72
ILT		 1382{
1383 uint64_t offset = 0;
1384 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1385 && gsym->can_use_relative_reloc(false))
2e702c99 1386 offset = (this->count_ + 1) * this->get_plt_entry_size();
67181c72
ILT		 1387 return this->address() + offset;
1388}
1389
1390// Return the PLT address to use for a local symbol. These are always
1391// IRELATIVE relocs.
1392
fc51264f 1393template<int size>
67181c72 1394uint64_t
fc51264f 1395Output_data_plt_x86_64<size>::address_for_local(const Relobj*, unsigned int)
67181c72 1396{
2e702c99 1397 return this->address() + (this->count_ + 1) * this->get_plt_entry_size();
67181c72
ILT		 1398}
1399
c2b45e22 1400// Set the final size.
fc51264f 1401template<int size>
c2b45e22 1402void
fc51264f 1403Output_data_plt_x86_64<size>::set_final_data_size()
c2b45e22 1404{
67181c72 1405 unsigned int count = this->count_ + this->irelative_count_;
c2b45e22
CC		 1406 if (this->has_tlsdesc_entry())
1407 ++count;
2e702c99 1408 this->set_data_size((count + 1) * this->get_plt_entry_size());
c2b45e22
CC		 1409}
1410
2e30d253
ILT		 1411// The first entry in the PLT for an executable.
1412
fc51264f
L		 1413template<int size>
1414const unsigned char
2e702c99 1415Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
2e30d253
ILT		 1416{
1417 // From AMD64 ABI Draft 0.98, page 76
1418 0xff, 0x35, // pushq contents of memory address
2e30d253 1419 0, 0, 0, 0, // replaced with address of .got + 8
78d911fd
ILT		 1420 0xff, 0x25, // jmp indirect
1421 0, 0, 0, 0, // replaced with address of .got + 16
2e30d253
ILT		 1422 0x90, 0x90, 0x90, 0x90 // noop (x4)
1423};
1424
2e702c99
RM		 1425template<int size>
1426void
1427Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1428 unsigned char* pov,
1429 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1430 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1431{
1432 memcpy(pov, first_plt_entry, plt_entry_size);
1433 // We do a jmp relative to the PC at the end of this instruction.
1434 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1435 (got_address + 8
1436 - (plt_address + 6)));
1437 elfcpp::Swap<32, false>::writeval(pov + 8,
1438 (got_address + 16
1439 - (plt_address + 12)));
1440}
1441
2e30d253
ILT		 1442// Subsequent entries in the PLT for an executable.
1443
fc51264f
L		 1444template<int size>
1445const unsigned char
2e702c99 1446Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
2e30d253
ILT		 1447{
1448 // From AMD64 ABI Draft 0.98, page 76
1449 0xff, 0x25, // jmpq indirect
1450 0, 0, 0, 0, // replaced with address of symbol in .got
1451 0x68, // pushq immediate
1452 0, 0, 0, 0, // replaced with offset into relocation table
1453 0xe9, // jmpq relative
1454 0, 0, 0, 0 // replaced with offset to start of .plt
1455};
1456
2e702c99
RM		 1457template<int size>
1458unsigned int
1459Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
1460 unsigned char* pov,
1461 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1462 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1463 unsigned int got_offset,
1464 unsigned int plt_offset,
1465 unsigned int plt_index)
1466{
1467 memcpy(pov, plt_entry, plt_entry_size);
1468 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1469 (got_address + got_offset
1470 - (plt_address + plt_offset
1471 + 6)));
1472
1473 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
1474 elfcpp::Swap<32, false>::writeval(pov + 12,
1475 - (plt_offset + plt_entry_size));
1476
1477 return 6;
1478}
1479
c2b45e22
CC		 1480// The reserved TLSDESC entry in the PLT for an executable.
1481
fc51264f
L		 1482template<int size>
1483const unsigned char
2e702c99 1484Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
c2b45e22
CC		 1485{
1486 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1487 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1488 0xff, 0x35, // pushq x(%rip)
1489 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1490 0xff, 0x25, // jmpq *y(%rip)
1491 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
1492 0x0f, 0x1f, // nop
1493 0x40, 0
1494};
1495
2e702c99
RM		 1496template<int size>
1497void
1498Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
1499 unsigned char* pov,
1500 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1501 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1502 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
1503 unsigned int tlsdesc_got_offset,
1504 unsigned int plt_offset)
1505{
1506 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
1507 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1508 (got_address + 8
1509 - (plt_address + plt_offset
1510 + 6)));
1511 elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
1512 (got_base
1513 + tlsdesc_got_offset
1514 - (plt_address + plt_offset
1515 + 12)));
1516}
1517
07a60597
ILT		 1518// The .eh_frame unwind information for the PLT.
1519
fc51264f 1520template<int size>
2e702c99 1521const unsigned char
fc51264f 1522Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
07a60597
ILT		 1523{
1524 1, // CIE version.
1525 'z', // Augmentation: augmentation size included.
1526 'R', // Augmentation: FDE encoding included.
1527 '\0', // End of augmentation string.
1528 1, // Code alignment factor.
1529 0x78, // Data alignment factor.
1530 16, // Return address column.
1531 1, // Augmentation size.
1532 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
1533 | elfcpp::DW_EH_PE_sdata4),
1534 elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1535 elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1536 elfcpp::DW_CFA_nop, // Align to 16 bytes.
1537 elfcpp::DW_CFA_nop
1538};
1539
fc51264f 1540template<int size>
07a60597 1541const unsigned char
2e702c99 1542Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
07a60597
ILT		 1543{
1544 0, 0, 0, 0, // Replaced with offset to .plt.
1545 0, 0, 0, 0, // Replaced with size of .plt.
1546 0, // Augmentation size.
1547 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
1548 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
1549 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
1550 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
1551 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
1552 11, // Block length.
1553 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
1554 elfcpp::DW_OP_breg16, 0, // Push %rip.
1555 elfcpp::DW_OP_lit15, // Push 0xf.
1556 elfcpp::DW_OP_and, // & (%rip & 0xf).
1557 elfcpp::DW_OP_lit11, // Push 0xb.
1558 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
1559 elfcpp::DW_OP_lit3, // Push 3.
1560 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
1561 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1562 elfcpp::DW_CFA_nop, // Align to 32 bytes.
1563 elfcpp::DW_CFA_nop,
1564 elfcpp::DW_CFA_nop,
1565 elfcpp::DW_CFA_nop
1566};
1567
2e30d253
ILT		 1568// Write out the PLT. This uses the hand-coded instructions above,
1569// and adjusts them as needed. This is specified by the AMD64 ABI.
1570
fc51264f 1571template<int size>
2e30d253 1572void
fc51264f 1573Output_data_plt_x86_64<size>::do_write(Output_file* of)
2e30d253 1574{
2ea97941 1575 const off_t offset = this->offset();
fe8718a4
ILT		 1576 const section_size_type oview_size =
1577 convert_to_section_size_type(this->data_size());
2ea97941 1578 unsigned char* const oview = of->get_output_view(offset, oview_size);
2e30d253
ILT		 1579
1580 const off_t got_file_offset = this->got_plt_->offset();
67181c72
ILT		 1581 gold_assert(parameters->incremental_update()
1582 || (got_file_offset + this->got_plt_->data_size()
1583 == this->got_irelative_->offset()));
fe8718a4 1584 const section_size_type got_size =
67181c72
ILT		 1585 convert_to_section_size_type(this->got_plt_->data_size()
1586 + this->got_irelative_->data_size());
2e30d253
ILT		 1587 unsigned char* const got_view = of->get_output_view(got_file_offset,
1588 got_size);
1589
1590 unsigned char* pov = oview;
1591
c2b45e22 1592 // The base address of the .plt section.
fc51264f 1593 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
c2b45e22 1594 // The base address of the .got section.
fc51264f 1595 typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
c2b45e22
CC		 1596 // The base address of the PLT portion of the .got section,
1597 // which is where the GOT pointer will point, and where the
1598 // three reserved GOT entries are located.
fc51264f
L		 1599 typename elfcpp::Elf_types<size>::Elf_Addr got_address
1600 = this->got_plt_->address();
2e30d253 1601
2e702c99
RM		 1602 this->fill_first_plt_entry(pov, got_address, plt_address);
1603 pov += this->get_plt_entry_size();
2e30d253
ILT		 1604
1605 unsigned char* got_pov = got_view;
1606
7d172687
ILT		 1607 // The first entry in the GOT is the address of the .dynamic section
1608 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1609 // We saved space for them when we created the section in
1610 // Target_x86_64::got_section.
1611 Output_section* dynamic = this->layout_->dynamic_section();
1612 uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1613 elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr);
1614 got_pov += 8;
1615 memset(got_pov, 0, 16);
1616 got_pov += 16;
2e30d253 1617
2e702c99 1618 unsigned int plt_offset = this->get_plt_entry_size();
2e30d253 1619 unsigned int got_offset = 24;
67181c72 1620 const unsigned int count = this->count_ + this->irelative_count_;
2e30d253
ILT		 1621 for (unsigned int plt_index = 0;
1622 plt_index < count;
1623 ++plt_index,
2e702c99 1624 pov += this->get_plt_entry_size(),
2e30d253 1625 got_pov += 8,
2e702c99 1626 plt_offset += this->get_plt_entry_size(),
2e30d253
ILT		 1627 got_offset += 8)
1628 {
1629 // Set and adjust the PLT entry itself.
2e702c99
RM		 1630 unsigned int lazy_offset = this->fill_plt_entry(pov,
1631 got_address, plt_address,
1632 got_offset, plt_offset,
1633 plt_index);
2e30d253
ILT		 1634
1635 // Set the entry in the GOT.
2e702c99
RM		 1636 elfcpp::Swap<64, false>::writeval(got_pov,
1637 plt_address + plt_offset + lazy_offset);
2e30d253
ILT		 1638 }
1639
c2b45e22
CC		 1640 if (this->has_tlsdesc_entry())
1641 {
1642 // Set and adjust the reserved TLSDESC PLT entry.
1643 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2e702c99
RM		 1644 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
1645 tlsdesc_got_offset, plt_offset);
1646 pov += this->get_plt_entry_size();
c2b45e22
CC		 1647 }
1648
fe8718a4
ILT		 1649 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1650 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2e30d253 1651
2ea97941 1652 of->write_output_view(offset, oview_size, oview);
2e30d253
ILT		 1653 of->write_output_view(got_file_offset, got_size, got_view);
1654}
1655
c2b45e22 1656// Create the PLT section.
2e30d253 1657
fc51264f 1658template<int size>
2e30d253 1659void
fc51264f 1660Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
2e30d253 1661{
2e30d253
ILT		 1662 if (this->plt_ == NULL)
1663 {
1664 // Create the GOT sections first.
1665 this->got_section(symtab, layout);
1666
2e702c99
RM		 1667 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
1668 this->got_irelative_);
1669
1670 // Add unwind information if requested.
1671 if (parameters->options().ld_generated_unwind_info())
1672 this->plt_->add_eh_frame(layout);
1673
2e30d253
ILT		 1674 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1675 (elfcpp::SHF_ALLOC
1676 | elfcpp::SHF_EXECINSTR),
22f0da72 1677 this->plt_, ORDER_PLT, false);
7223e9ca
ILT		 1678
1679 // Make the sh_info field of .rela.plt point to .plt.
1680 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1681 rela_plt_os->set_info_section(this->plt_->output_section());
2e30d253 1682 }
c2b45e22
CC		 1683}
1684
e291e7b9
ILT		 1685// Return the section for TLSDESC relocations.
1686
fc51264f
L		 1687template<int size>
1688typename Target_x86_64<size>::Reloc_section*
1689Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
e291e7b9
ILT		 1690{
1691 return this->plt_section()->rela_tlsdesc(layout);
1692}
1693
c2b45e22
CC		 1694// Create a PLT entry for a global symbol.
1695
fc51264f 1696template<int size>
c2b45e22 1697void
fc51264f
L		 1698Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
1699 Symbol* gsym)
c2b45e22
CC		 1700{
1701 if (gsym->has_plt_offset())
1702 return;
1703
1704 if (this->plt_ == NULL)
1705 this->make_plt_section(symtab, layout);
2e30d253 1706
67181c72 1707 this->plt_->add_entry(symtab, layout, gsym);
2e30d253
ILT		 1708}
1709
7223e9ca
ILT		 1710// Make a PLT entry for a local STT_GNU_IFUNC symbol.
1711
fc51264f 1712template<int size>
7223e9ca 1713void
fc51264f
L		 1714Target_x86_64<size>::make_local_ifunc_plt_entry(
1715 Symbol_table* symtab, Layout* layout,
1716 Sized_relobj_file<size, false>* relobj,
1717 unsigned int local_sym_index)
7223e9ca
ILT		 1718{
1719 if (relobj->local_has_plt_offset(local_sym_index))
1720 return;
1721 if (this->plt_ == NULL)
1722 this->make_plt_section(symtab, layout);
67181c72
ILT		 1723 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
1724 relobj,
7223e9ca
ILT		 1725 local_sym_index);
1726 relobj->set_local_plt_offset(local_sym_index, plt_offset);
1727}
1728
0e70b911
CC		 1729// Return the number of entries in the PLT.
1730
fc51264f 1731template<int size>
0e70b911 1732unsigned int
fc51264f 1733Target_x86_64<size>::plt_entry_count() const
0e70b911
CC		 1734{
1735 if (this->plt_ == NULL)
1736 return 0;
1737 return this->plt_->entry_count();
1738}
1739
1740// Return the offset of the first non-reserved PLT entry.
1741
fc51264f 1742template<int size>
0e70b911 1743unsigned int
fc51264f 1744Target_x86_64<size>::first_plt_entry_offset() const
0e70b911 1745{
2e702c99 1746 return this->plt_->first_plt_entry_offset();
0e70b911
CC		 1747}
1748
1749// Return the size of each PLT entry.
1750
fc51264f 1751template<int size>
0e70b911 1752unsigned int
fc51264f 1753Target_x86_64<size>::plt_entry_size() const
0e70b911 1754{
2e702c99 1755 return this->plt_->get_plt_entry_size();
0e70b911
CC		 1756}
1757
4829d394
CC		 1758// Create the GOT and PLT sections for an incremental update.
1759
fc51264f 1760template<int size>
dd74ae06 1761Output_data_got_base*
fc51264f 1762Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
4829d394
CC		 1763 Layout* layout,
1764 unsigned int got_count,
1765 unsigned int plt_count)
1766{
1767 gold_assert(this->got_ == NULL);
1768
1769 this->got_ = new Output_data_got<64, false>(got_count * 8);
1770 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1771 (elfcpp::SHF_ALLOC
1772 | elfcpp::SHF_WRITE),
1773 this->got_, ORDER_RELRO_LAST,
1774 true);
1775
1776 // Add the three reserved entries.
1777 this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT");
1778 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1779 (elfcpp::SHF_ALLOC
1780 | elfcpp::SHF_WRITE),
1781 this->got_plt_, ORDER_NON_RELRO_FIRST,
1782 false);
1783
1784 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1785 this->global_offset_table_ =
1786 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1787 Symbol_table::PREDEFINED,
1788 this->got_plt_,
1789 0, 0, elfcpp::STT_OBJECT,
1790 elfcpp::STB_LOCAL,
1791 elfcpp::STV_HIDDEN, 0,
1792 false, false);
1793
1794 // If there are any TLSDESC relocations, they get GOT entries in
1795 // .got.plt after the jump slot entries.
1796 // FIXME: Get the count for TLSDESC entries.
1797 this->got_tlsdesc_ = new Output_data_got<64, false>(0);
1798 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1799 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1800 this->got_tlsdesc_,
1801 ORDER_NON_RELRO_FIRST, false);
1802
67181c72
ILT		 1803 // If there are any IRELATIVE relocations, they get GOT entries in
1804 // .got.plt after the jump slot and TLSDESC entries.
1805 this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1806 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1807 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1808 this->got_irelative_,
1809 ORDER_NON_RELRO_FIRST, false);
1810
4829d394 1811 // Create the PLT section.
2e702c99
RM		 1812 this->plt_ = this->make_data_plt(layout, this->got_,
1813 this->got_plt_,
1814 this->got_irelative_,
1815 plt_count);
1816
1817 // Add unwind information if requested.
1818 if (parameters->options().ld_generated_unwind_info())
1819 this->plt_->add_eh_frame(layout);
1820
4829d394
CC		 1821 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1822 elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
1823 this->plt_, ORDER_PLT, false);
1824
1825 // Make the sh_info field of .rela.plt point to .plt.
1826 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1827 rela_plt_os->set_info_section(this->plt_->output_section());
1828
6fa2a40b
CC		 1829 // Create the rela_dyn section.
1830 this->rela_dyn_section(layout);
1831
4829d394
CC		 1832 return this->got_;
1833}
1834
6fa2a40b
CC		 1835// Reserve a GOT entry for a local symbol, and regenerate any
1836// necessary dynamic relocations.
1837
fc51264f 1838template<int size>
6fa2a40b 1839void
fc51264f 1840Target_x86_64<size>::reserve_local_got_entry(
6fa2a40b 1841 unsigned int got_index,
fc51264f 1842 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 1843 unsigned int r_sym,
1844 unsigned int got_type)
1845{
1846 unsigned int got_offset = got_index * 8;
1847 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1848
1849 this->got_->reserve_local(got_index, obj, r_sym, got_type);
1850 switch (got_type)
1851 {
1852 case GOT_TYPE_STANDARD:
1853 if (parameters->options().output_is_position_independent())
1854 rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
397b129b 1855 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1856 break;
1857 case GOT_TYPE_TLS_OFFSET:
1858 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
1859 this->got_, got_offset, 0);
1860 break;
1861 case GOT_TYPE_TLS_PAIR:
1862 this->got_->reserve_slot(got_index + 1);
1863 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
1864 this->got_, got_offset, 0);
1865 break;
1866 case GOT_TYPE_TLS_DESC:
1867 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
1868 // this->got_->reserve_slot(got_index + 1);
1869 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
1870 // this->got_, got_offset, 0);
1871 break;
1872 default:
1873 gold_unreachable();
1874 }
1875}
1876
1877// Reserve a GOT entry for a global symbol, and regenerate any
1878// necessary dynamic relocations.
1879
fc51264f 1880template<int size>
6fa2a40b 1881void
fc51264f
L		 1882Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
1883 Symbol* gsym,
1884 unsigned int got_type)
6fa2a40b
CC		 1885{
1886 unsigned int got_offset = got_index * 8;
1887 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1888
1889 this->got_->reserve_global(got_index, gsym, got_type);
1890 switch (got_type)
1891 {
1892 case GOT_TYPE_STANDARD:
1893 if (!gsym->final_value_is_known())
1894 {
1895 if (gsym->is_from_dynobj()
1896 || gsym->is_undefined()
1897 || gsym->is_preemptible()
1898 || gsym->type() == elfcpp::STT_GNU_IFUNC)
1899 rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
1900 this->got_, got_offset, 0);
1901 else
1902 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
13cf9988 1903 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1904 }
1905 break;
1906 case GOT_TYPE_TLS_OFFSET:
1907 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
13cf9988 1908 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1909 break;
1910 case GOT_TYPE_TLS_PAIR:
1911 this->got_->reserve_slot(got_index + 1);
1912 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
13cf9988 1913 this->got_, got_offset, 0, false);
6fa2a40b 1914 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
13cf9988 1915 this->got_, got_offset + 8, 0, false);
6fa2a40b
CC		 1916 break;
1917 case GOT_TYPE_TLS_DESC:
1918 this->got_->reserve_slot(got_index + 1);
1919 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
13cf9988 1920 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1921 break;
1922 default:
1923 gold_unreachable();
1924 }
1925}
1926
4829d394
CC		 1927// Register an existing PLT entry for a global symbol.
1928
fc51264f 1929template<int size>
4829d394 1930void
fc51264f
L		 1931Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
1932 Layout* layout,
1933 unsigned int plt_index,
1934 Symbol* gsym)
4829d394
CC		 1935{
1936 gold_assert(this->plt_ != NULL);
1937 gold_assert(!gsym->has_plt_offset());
1938
1939 this->plt_->reserve_slot(plt_index);
1940
1941 gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
1942
1943 unsigned int got_offset = (plt_index + 3) * 8;
67181c72 1944 this->plt_->add_relocation(symtab, layout, gsym, got_offset);
4829d394
CC		 1945}
1946
26d3c67d
CC		 1947// Force a COPY relocation for a given symbol.
1948
fc51264f 1949template<int size>
26d3c67d 1950void
fc51264f 1951Target_x86_64<size>::emit_copy_reloc(
26d3c67d
CC		 1952 Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
1953{
1954 this->copy_relocs_.emit_copy_reloc(symtab,
fc51264f 1955 symtab->get_sized_symbol<size>(sym),
26d3c67d
CC		 1956 os,
1957 offset,
1958 this->rela_dyn_section(NULL));
1959}
1960
9fa33bee 1961// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029 1962
fc51264f 1963template<int size>
edfbb029 1964void
fc51264f
L		 1965Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
1966 Layout* layout)
edfbb029
CC		 1967{
1968 if (this->tls_base_symbol_defined_)
1969 return;
1970
1971 Output_segment* tls_segment = layout->tls_segment();
1972 if (tls_segment != NULL)
1973 {
183fd0e3 1974 bool is_exec = parameters->options().output_is_executable();
edfbb029 1975 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 1976 Symbol_table::PREDEFINED,
edfbb029
CC		 1977 tls_segment, 0, 0,
1978 elfcpp::STT_TLS,
1979 elfcpp::STB_LOCAL,
1980 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 1981 (is_exec
1982 ? Symbol::SEGMENT_END
1983 : Symbol::SEGMENT_START),
1984 true);
edfbb029
CC		 1985 }
1986 this->tls_base_symbol_defined_ = true;
1987}
1988
c2b45e22
CC		 1989// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
1990
fc51264f 1991template<int size>
c2b45e22 1992void
fc51264f 1993Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2e702c99 1994 Layout* layout)
c2b45e22
CC		 1995{
1996 if (this->plt_ == NULL)
1997 this->make_plt_section(symtab, layout);
1998
1999 if (!this->plt_->has_tlsdesc_entry())
2000 {
2001 // Allocate the TLSDESC_GOT entry.
2002 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2003 unsigned int got_offset = got->add_constant(0);
2004
2005 // Allocate the TLSDESC_PLT entry.
2006 this->plt_->reserve_tlsdesc_entry(got_offset);
2007 }
2008}
2009
31d60480
ILT		 2010// Create a GOT entry for the TLS module index.
2011
fc51264f 2012template<int size>
31d60480 2013unsigned int
fc51264f
L		 2014Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2015 Sized_relobj_file<size, false>* object)
31d60480
ILT		 2016{
2017 if (this->got_mod_index_offset_ == -1U)
2018 {
2019 gold_assert(symtab != NULL && layout != NULL && object != NULL);
2020 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
2021 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2022 unsigned int got_offset = got->add_constant(0);
2023 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2e702c99 2024 got_offset, 0);
009a67a2 2025 got->add_constant(0);
31d60480
ILT		 2026 this->got_mod_index_offset_ = got_offset;
2027 }
2028 return this->got_mod_index_offset_;
2029}
2030
2e30d253
ILT		 2031// Optimize the TLS relocation type based on what we know about the
2032// symbol. IS_FINAL is true if the final address of this symbol is
2033// known at link time.
2034
fc51264f 2035template<int size>
e041f13d 2036tls::Tls_optimization
fc51264f 2037Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2e30d253 2038{
2e30d253
ILT		 2039 // If we are generating a shared library, then we can't do anything
2040 // in the linker.
8851ecca 2041 if (parameters->options().shared())
e041f13d 2042 return tls::TLSOPT_NONE;
2e30d253
ILT		 2043
2044 switch (r_type)
2045 {
2046 case elfcpp::R_X86_64_TLSGD:
e041f13d
ILT		 2047 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2048 case elfcpp::R_X86_64_TLSDESC_CALL:
2049 // These are General-Dynamic which permits fully general TLS
2e30d253
ILT		 2050 // access. Since we know that we are generating an executable,
2051 // we can convert this to Initial-Exec. If we also know that
2052 // this is a local symbol, we can further switch to Local-Exec.
2053 if (is_final)
e041f13d
ILT		 2054 return tls::TLSOPT_TO_LE;
2055 return tls::TLSOPT_TO_IE;
2e30d253 2056
d61c17ea 2057 case elfcpp::R_X86_64_TLSLD:
2e30d253
ILT		 2058 // This is Local-Dynamic, which refers to a local symbol in the
2059 // dynamic TLS block. Since we know that we generating an
2060 // executable, we can switch to Local-Exec.
e041f13d 2061 return tls::TLSOPT_TO_LE;
2e30d253 2062
0ffd9845 2063 case elfcpp::R_X86_64_DTPOFF32:
0ffd9845
ILT		 2064 case elfcpp::R_X86_64_DTPOFF64:
2065 // Another Local-Dynamic reloc.
e041f13d 2066 return tls::TLSOPT_TO_LE;
0ffd9845 2067
d61c17ea 2068 case elfcpp::R_X86_64_GOTTPOFF:
2e30d253
ILT		 2069 // These are Initial-Exec relocs which get the thread offset
2070 // from the GOT. If we know that we are linking against the
2071 // local symbol, we can switch to Local-Exec, which links the
2072 // thread offset into the instruction.
2073 if (is_final)
e041f13d
ILT		 2074 return tls::TLSOPT_TO_LE;
2075 return tls::TLSOPT_NONE;
2e30d253 2076
d61c17ea 2077 case elfcpp::R_X86_64_TPOFF32:
2e30d253
ILT		 2078 // When we already have Local-Exec, there is nothing further we
2079 // can do.
e041f13d 2080 return tls::TLSOPT_NONE;
2e30d253
ILT		 2081
2082 default:
2083 gold_unreachable();
2084 }
2e30d253
ILT		 2085}
2086
95a2c8d6
RS		 2087// Get the Reference_flags for a particular relocation.
2088
fc51264f 2089template<int size>
95a2c8d6 2090int
fc51264f 2091Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
95a2c8d6
RS		 2092{
2093 switch (r_type)
2094 {
2095 case elfcpp::R_X86_64_NONE:
2096 case elfcpp::R_X86_64_GNU_VTINHERIT:
2097 case elfcpp::R_X86_64_GNU_VTENTRY:
2098 case elfcpp::R_X86_64_GOTPC32:
2099 case elfcpp::R_X86_64_GOTPC64:
2100 // No symbol reference.
2101 return 0;
2102
2103 case elfcpp::R_X86_64_64:
2104 case elfcpp::R_X86_64_32:
2105 case elfcpp::R_X86_64_32S:
2106 case elfcpp::R_X86_64_16:
2107 case elfcpp::R_X86_64_8:
2108 return Symbol::ABSOLUTE_REF;
2109
2110 case elfcpp::R_X86_64_PC64:
2111 case elfcpp::R_X86_64_PC32:
2112 case elfcpp::R_X86_64_PC16:
2113 case elfcpp::R_X86_64_PC8:
2114 case elfcpp::R_X86_64_GOTOFF64:
2115 return Symbol::RELATIVE_REF;
2116
2117 case elfcpp::R_X86_64_PLT32:
2118 case elfcpp::R_X86_64_PLTOFF64:
2119 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
2120
2121 case elfcpp::R_X86_64_GOT64:
2122 case elfcpp::R_X86_64_GOT32:
2123 case elfcpp::R_X86_64_GOTPCREL64:
2124 case elfcpp::R_X86_64_GOTPCREL:
2125 case elfcpp::R_X86_64_GOTPLT64:
2126 // Absolute in GOT.
2127 return Symbol::ABSOLUTE_REF;
2128
2129 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2130 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2131 case elfcpp::R_X86_64_TLSDESC_CALL:
2132 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2133 case elfcpp::R_X86_64_DTPOFF32:
2134 case elfcpp::R_X86_64_DTPOFF64:
2135 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2136 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2137 return Symbol::TLS_REF;
2138
2139 case elfcpp::R_X86_64_COPY:
2140 case elfcpp::R_X86_64_GLOB_DAT:
2141 case elfcpp::R_X86_64_JUMP_SLOT:
2142 case elfcpp::R_X86_64_RELATIVE:
2143 case elfcpp::R_X86_64_IRELATIVE:
2144 case elfcpp::R_X86_64_TPOFF64:
2145 case elfcpp::R_X86_64_DTPMOD64:
2146 case elfcpp::R_X86_64_TLSDESC:
2147 case elfcpp::R_X86_64_SIZE32:
2148 case elfcpp::R_X86_64_SIZE64:
2149 default:
2150 // Not expected. We will give an error later.
2151 return 0;
2152 }
2153}
2154
e041f13d
ILT		 2155// Report an unsupported relocation against a local symbol.
2156
fc51264f 2157template<int size>
e041f13d 2158void
fc51264f
L		 2159Target_x86_64<size>::Scan::unsupported_reloc_local(
2160 Sized_relobj_file<size, false>* object,
6fa2a40b 2161 unsigned int r_type)
e041f13d 2162{
75f2446e
ILT		 2163 gold_error(_("%s: unsupported reloc %u against local symbol"),
2164 object->name().c_str(), r_type);
e041f13d
ILT		 2165}
2166
a036edd8
ILT		 2167// We are about to emit a dynamic relocation of type R_TYPE. If the
2168// dynamic linker does not support it, issue an error. The GNU linker
2169// only issues a non-PIC error for an allocated read-only section.
2170// Here we know the section is allocated, but we don't know that it is
2171// read-only. But we check for all the relocation types which the
2172// glibc dynamic linker supports, so it seems appropriate to issue an
a29b0dad
ILT		 2173// error even if the section is not read-only. If GSYM is not NULL,
2174// it is the symbol the relocation is against; if it is NULL, the
2175// relocation is against a local symbol.
a036edd8 2176
fc51264f 2177template<int size>
a036edd8 2178void
fc51264f
L		 2179Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
2180 Symbol* gsym)
a036edd8
ILT		 2181{
2182 switch (r_type)
2183 {
2fbb4320
ILT		 2184 // These are the relocation types supported by glibc for x86_64
2185 // which should always work.
a036edd8 2186 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2187 case elfcpp::R_X86_64_IRELATIVE:
a036edd8
ILT		 2188 case elfcpp::R_X86_64_GLOB_DAT:
2189 case elfcpp::R_X86_64_JUMP_SLOT:
2190 case elfcpp::R_X86_64_DTPMOD64:
2191 case elfcpp::R_X86_64_DTPOFF64:
2192 case elfcpp::R_X86_64_TPOFF64:
2193 case elfcpp::R_X86_64_64:
2fbb4320
ILT		 2194 case elfcpp::R_X86_64_COPY:
2195 return;
2196
2197 // glibc supports these reloc types, but they can overflow.
a036edd8 2198 case elfcpp::R_X86_64_PC32:
a29b0dad
ILT		 2199 // A PC relative reference is OK against a local symbol or if
2200 // the symbol is defined locally.
2201 if (gsym == NULL
2202 || (!gsym->is_from_dynobj()
2203 && !gsym->is_undefined()
2204 && !gsym->is_preemptible()))
2205 return;
2206 /* Fall through. */
2207 case elfcpp::R_X86_64_32:
3660ff06
L		 2208 // R_X86_64_32 is OK for x32.
2209 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2210 return;
2fbb4320
ILT		 2211 if (this->issued_non_pic_error_)
2212 return;
2213 gold_assert(parameters->options().output_is_position_independent());
a29b0dad
ILT		 2214 if (gsym == NULL)
2215 object->error(_("requires dynamic R_X86_64_32 reloc which may "
2216 "overflow at runtime; recompile with -fPIC"));
2217 else
2218 object->error(_("requires dynamic %s reloc against '%s' which may "
2219 "overflow at runtime; recompile with -fPIC"),
2220 (r_type == elfcpp::R_X86_64_32
2221 ? "R_X86_64_32"
2222 : "R_X86_64_PC32"),
2223 gsym->name());
2fbb4320 2224 this->issued_non_pic_error_ = true;
a036edd8
ILT		 2225 return;
2226
2227 default:
2228 // This prevents us from issuing more than one error per reloc
2229 // section. But we can still wind up issuing more than one
2230 // error per object file.
2231 if (this->issued_non_pic_error_)
2e702c99 2232 return;
33aea2fd 2233 gold_assert(parameters->options().output_is_position_independent());
a29b0dad 2234 object->error(_("requires unsupported dynamic reloc %u; "
2e702c99 2235 "recompile with -fPIC"),
a29b0dad 2236 r_type);
a036edd8
ILT		 2237 this->issued_non_pic_error_ = true;
2238 return;
2239
2240 case elfcpp::R_X86_64_NONE:
2241 gold_unreachable();
2242 }
2243}
2244
7223e9ca
ILT		 2245// Return whether we need to make a PLT entry for a relocation of the
2246// given type against a STT_GNU_IFUNC symbol.
2247
fc51264f 2248template<int size>
7223e9ca 2249bool
fc51264f
L		 2250Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
2251 Sized_relobj_file<size, false>* object,
6fa2a40b 2252 unsigned int r_type)
7223e9ca 2253{
95a2c8d6
RS		 2254 int flags = Scan::get_reference_flags(r_type);
2255 if (flags & Symbol::TLS_REF)
2256 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2e702c99 2257 object->name().c_str(), r_type);
95a2c8d6 2258 return flags != 0;
7223e9ca
ILT		 2259}
2260
2e30d253
ILT		 2261// Scan a relocation for a local symbol.
2262
fc51264f 2263template<int size>
2e30d253 2264inline void
fc51264f
L		 2265Target_x86_64<size>::Scan::local(Symbol_table* symtab,
2266 Layout* layout,
2267 Target_x86_64<size>* target,
2268 Sized_relobj_file<size, false>* object,
2269 unsigned int data_shndx,
2270 Output_section* output_section,
2271 const elfcpp::Rela<size, false>& reloc,
2272 unsigned int r_type,
2273 const elfcpp::Sym<size, false>& lsym)
2e30d253 2274{
7223e9ca 2275 // A local STT_GNU_IFUNC symbol may require a PLT entry.
397b129b
CC		 2276 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
2277 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
7223e9ca 2278 {
fc51264f 2279 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 2280 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
2281 }
2282
2e30d253
ILT		 2283 switch (r_type)
2284 {
2285 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 2286 case elfcpp::R_X86_64_GNU_VTINHERIT:
2287 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 2288 break;
2289
2290 case elfcpp::R_X86_64_64:
d61c6bd4 2291 // If building a shared library (or a position-independent
dceae3c1
ILT		 2292 // executable), we need to create a dynamic relocation for this
2293 // location. The relocation applied at link time will apply the
2294 // link-time value, so we flag the location with an
2295 // R_X86_64_RELATIVE relocation so the dynamic loader can
d61c6bd4 2296 // relocate it easily.
8851ecca 2297 if (parameters->options().output_is_position_independent())
2e702c99
RM		 2298 {
2299 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2300 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca
ILT		 2301 rela_dyn->add_local_relative(object, r_sym,
2302 elfcpp::R_X86_64_RELATIVE,
2303 output_section, data_shndx,
2304 reloc.get_r_offset(),
397b129b 2305 reloc.get_r_addend(), is_ifunc);
2e702c99 2306 }
d61c6bd4
ILT		 2307 break;
2308
2e30d253
ILT		 2309 case elfcpp::R_X86_64_32:
2310 case elfcpp::R_X86_64_32S:
2311 case elfcpp::R_X86_64_16:
2312 case elfcpp::R_X86_64_8:
96f2030e 2313 // If building a shared library (or a position-independent
dceae3c1
ILT		 2314 // executable), we need to create a dynamic relocation for this
2315 // location. We can't use an R_X86_64_RELATIVE relocation
2316 // because that is always a 64-bit relocation.
8851ecca 2317 if (parameters->options().output_is_position_independent())
2e702c99 2318 {
3660ff06
L		 2319 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2320 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2321 {
2322 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2323 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2324 rela_dyn->add_local_relative(object, r_sym,
2325 elfcpp::R_X86_64_RELATIVE,
2326 output_section, data_shndx,
2327 reloc.get_r_offset(),
2328 reloc.get_r_addend(), is_ifunc);
2329 break;
2330 }
2331
2e702c99 2332 this->check_non_pic(object, r_type, NULL);
a036edd8 2333
2e702c99 2334 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
fc51264f 2335 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2e702c99 2336 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 2337 rela_dyn->add_local(object, r_sym, r_type, output_section,
2338 data_shndx, reloc.get_r_offset(),
2339 reloc.get_r_addend());
2e702c99
RM		 2340 else
2341 {
2342 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 2343 unsigned int shndx = lsym.get_st_shndx();
2344 bool is_ordinary;
2345 shndx = object->adjust_sym_shndx(r_sym, shndx,
2346 &is_ordinary);
2347 if (!is_ordinary)
2348 object->error(_("section symbol %u has bad shndx %u"),
2349 r_sym, shndx);
2350 else
2351 rela_dyn->add_local_section(object, shndx,
2352 r_type, output_section,
2353 data_shndx, reloc.get_r_offset(),
2354 reloc.get_r_addend());
2e702c99
RM		 2355 }
2356 }
2e30d253
ILT		 2357 break;
2358
2359 case elfcpp::R_X86_64_PC64:
2360 case elfcpp::R_X86_64_PC32:
2361 case elfcpp::R_X86_64_PC16:
2362 case elfcpp::R_X86_64_PC8:
2363 break;
2364
f389a824
ILT		 2365 case elfcpp::R_X86_64_PLT32:
2366 // Since we know this is a local symbol, we can handle this as a
2367 // PC32 reloc.
2368 break;
2369
fdc2f80f 2370 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 2371 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 2372 case elfcpp::R_X86_64_GOTPC64:
2373 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 2374 // We need a GOT section.
2375 target->got_section(symtab, layout);
ee9e9e86
ILT		 2376 // For PLTOFF64, we'd normally want a PLT section, but since we
2377 // know this is a local symbol, no PLT is needed.
2e30d253
ILT		 2378 break;
2379
0ffd9845
ILT		 2380 case elfcpp::R_X86_64_GOT64:
2381 case elfcpp::R_X86_64_GOT32:
2382 case elfcpp::R_X86_64_GOTPCREL64:
2383 case elfcpp::R_X86_64_GOTPCREL:
ee9e9e86 2384 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845 2385 {
2e702c99
RM		 2386 // The symbol requires a GOT entry.
2387 Output_data_got<64, false>* got = target->got_section(symtab, layout);
2388 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 2389
2390 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
2391 // lets function pointers compare correctly with shared
2392 // libraries. Otherwise we would need an IRELATIVE reloc.
2393 bool is_new;
397b129b 2394 if (is_ifunc)
7223e9ca
ILT		 2395 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
2396 else
2397 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2e702c99
RM		 2398 if (is_new)
2399 {
2400 // If we are generating a shared object, we need to add a
2401 // dynamic relocation for this symbol's GOT entry.
2402 if (parameters->options().output_is_position_independent())
2403 {
2404 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7bf1f802
ILT		 2405 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2406 if (r_type != elfcpp::R_X86_64_GOT32)
7223e9ca
ILT		 2407 {
2408 unsigned int got_offset =
2409 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
2410 rela_dyn->add_local_relative(object, r_sym,
2411 elfcpp::R_X86_64_RELATIVE,
397b129b 2412 got, got_offset, 0, is_ifunc);
7223e9ca 2413 }
2e702c99
RM		 2414 else
2415 {
2416 this->check_non_pic(object, r_type, NULL);
2417
2418 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
2419 rela_dyn->add_local(
2420 object, r_sym, r_type, got,
2421 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
2422 }
2423 }
2424 }
2425 // For GOTPLT64, we'd normally want a PLT section, but since
2426 // we know this is a local symbol, no PLT is needed.
0ffd9845
ILT		 2427 }
2428 break;
2429
2e30d253
ILT		 2430 case elfcpp::R_X86_64_COPY:
2431 case elfcpp::R_X86_64_GLOB_DAT:
2432 case elfcpp::R_X86_64_JUMP_SLOT:
2433 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2434 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 2435 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 2436 case elfcpp::R_X86_64_TPOFF64:
2e30d253 2437 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 2438 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 2439 gold_error(_("%s: unexpected reloc %u in object file"),
2440 object->name().c_str(), r_type);
2e30d253
ILT		 2441 break;
2442
d61c17ea 2443 // These are initial tls relocs, which are expected when linking
56622147
ILT		 2444 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2445 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 2446 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 2447 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 2448 case elfcpp::R_X86_64_DTPOFF32:
2449 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 2450 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2451 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 2452 {
8851ecca 2453 bool output_is_shared = parameters->options().shared();
e041f13d 2454 const tls::Tls_optimization optimized_type
2e702c99 2455 = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
fc51264f 2456 r_type);
2e30d253
ILT		 2457 switch (r_type)
2458 {
2e702c99
RM		 2459 case elfcpp::R_X86_64_TLSGD: // General-dynamic
2460 if (optimized_type == tls::TLSOPT_NONE)
2461 {
2462 // Create a pair of GOT entries for the module index and
2463 // dtv-relative offset.
2464 Output_data_got<64, false>* got
2465 = target->got_section(symtab, layout);
2466 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
d491d34e
ILT		 2467 unsigned int shndx = lsym.get_st_shndx();
2468 bool is_ordinary;
2469 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
2470 if (!is_ordinary)
2471 object->error(_("local symbol %u has bad shndx %u"),
2472 r_sym, shndx);
2e702c99 2473 else
83896202
ILT		 2474 got->add_local_pair_with_rel(object, r_sym,
2475 shndx,
2476 GOT_TYPE_TLS_PAIR,
2477 target->rela_dyn_section(layout),
2478 elfcpp::R_X86_64_DTPMOD64, 0);
2e702c99
RM		 2479 }
2480 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 2481 unsupported_reloc_local(object, r_type);
2e702c99 2482 break;
7bf1f802 2483
2e702c99
RM		 2484 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2485 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 2486 if (optimized_type == tls::TLSOPT_NONE)
2487 {
2e702c99
RM		 2488 // Create reserved PLT and GOT entries for the resolver.
2489 target->reserve_tlsdesc_entries(symtab, layout);
2490
2491 // Generate a double GOT entry with an
2492 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
2493 // is resolved lazily, so the GOT entry needs to be in
2494 // an area in .got.plt, not .got. Call got_section to
2495 // make sure the section has been created.
a8df5856 2496 target->got_section(symtab, layout);
2e702c99
RM		 2497 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2498 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
e291e7b9
ILT		 2499 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
2500 {
2501 unsigned int got_offset = got->add_constant(0);
2502 got->add_constant(0);
2503 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
2504 got_offset);
2505 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2506 // We store the arguments we need in a vector, and
2507 // use the index into the vector as the parameter
2508 // to pass to the target specific routines.
2509 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
2510 void* arg = reinterpret_cast<void*>(intarg);
2511 rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2512 got, got_offset, 0);
2513 }
c2b45e22
CC		 2514 }
2515 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 2516 unsupported_reloc_local(object, r_type);
2e30d253
ILT		 2517 break;
2518
2e702c99 2519 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 2520 break;
2521
2e702c99 2522 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 2523 if (optimized_type == tls::TLSOPT_NONE)
2524 {
2e702c99
RM		 2525 // Create a GOT entry for the module index.
2526 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 2527 }
2528 else if (optimized_type != tls::TLSOPT_TO_LE)
2529 unsupported_reloc_local(object, r_type);
2530 break;
2531
2e702c99
RM		 2532 case elfcpp::R_X86_64_DTPOFF32:
2533 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 2534 break;
2535
2e702c99 2536 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 2537 layout->set_has_static_tls();
2e702c99
RM		 2538 if (optimized_type == tls::TLSOPT_NONE)
2539 {
2540 // Create a GOT entry for the tp-relative offset.
2541 Output_data_got<64, false>* got
2542 = target->got_section(symtab, layout);
2543 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2544 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 2545 target->rela_dyn_section(layout),
2546 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 2547 }
2548 else if (optimized_type != tls::TLSOPT_TO_LE)
2549 unsupported_reloc_local(object, r_type);
2550 break;
0ffd9845 2551
2e702c99 2552 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 2553 layout->set_has_static_tls();
2e702c99
RM		 2554 if (output_is_shared)
2555 unsupported_reloc_local(object, r_type);
2e30d253 2556 break;
e041f13d 2557
2e702c99
RM		 2558 default:
2559 gold_unreachable();
2e30d253
ILT		 2560 }
2561 }
2562 break;
2e30d253 2563
fdc2f80f
ILT		 2564 case elfcpp::R_X86_64_SIZE32:
2565 case elfcpp::R_X86_64_SIZE64:
2e30d253 2566 default:
75f2446e
ILT		 2567 gold_error(_("%s: unsupported reloc %u against local symbol"),
2568 object->name().c_str(), r_type);
2e30d253
ILT		 2569 break;
2570 }
2571}
2572
2573
e041f13d
ILT		 2574// Report an unsupported relocation against a global symbol.
2575
fc51264f 2576template<int size>
e041f13d 2577void
fc51264f
L		 2578Target_x86_64<size>::Scan::unsupported_reloc_global(
2579 Sized_relobj_file<size, false>* object,
6fa2a40b
CC		 2580 unsigned int r_type,
2581 Symbol* gsym)
e041f13d 2582{
75f2446e 2583 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 2584 object->name().c_str(), r_type, gsym->demangled_name().c_str());
e041f13d
ILT		 2585}
2586
ce97fa81 2587// Returns true if this relocation type could be that of a function pointer.
fc51264f 2588template<int size>
21bb3914 2589inline bool
fc51264f 2590Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
21bb3914 2591{
21bb3914
ST		 2592 switch (r_type)
2593 {
2594 case elfcpp::R_X86_64_64:
2595 case elfcpp::R_X86_64_32:
2596 case elfcpp::R_X86_64_32S:
2597 case elfcpp::R_X86_64_16:
2598 case elfcpp::R_X86_64_8:
ce97fa81
ST		 2599 case elfcpp::R_X86_64_GOT64:
2600 case elfcpp::R_X86_64_GOT32:
2601 case elfcpp::R_X86_64_GOTPCREL64:
2602 case elfcpp::R_X86_64_GOTPCREL:
2603 case elfcpp::R_X86_64_GOTPLT64:
21bb3914 2604 {
2e702c99 2605 return true;
21bb3914
ST		 2606 }
2607 }
2608 return false;
2609}
2610
2611// For safe ICF, scan a relocation for a local symbol to check if it
2612// corresponds to a function pointer being taken. In that case mark
2613// the function whose pointer was taken as not foldable.
2614
fc51264f 2615template<int size>
21bb3914 2616inline bool
fc51264f 2617Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
21bb3914
ST		 2618 Symbol_table* ,
2619 Layout* ,
fc51264f
L		 2620 Target_x86_64<size>* ,
2621 Sized_relobj_file<size, false>* ,
21bb3914
ST		 2622 unsigned int ,
2623 Output_section* ,
fc51264f 2624 const elfcpp::Rela<size, false>& ,
21bb3914 2625 unsigned int r_type,
fc51264f 2626 const elfcpp::Sym<size, false>&)
21bb3914
ST		 2627{
2628 // When building a shared library, do not fold any local symbols as it is
2629 // not possible to distinguish pointer taken versus a call by looking at
2630 // the relocation types.
2631 return (parameters->options().shared()
2e702c99 2632 || possible_function_pointer_reloc(r_type));
21bb3914
ST		 2633}
2634
2635// For safe ICF, scan a relocation for a global symbol to check if it
2636// corresponds to a function pointer being taken. In that case mark
2637// the function whose pointer was taken as not foldable.
2638
fc51264f 2639template<int size>
21bb3914 2640inline bool
fc51264f 2641Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
21bb3914
ST		 2642 Symbol_table*,
2643 Layout* ,
fc51264f
L		 2644 Target_x86_64<size>* ,
2645 Sized_relobj_file<size, false>* ,
21bb3914
ST		 2646 unsigned int ,
2647 Output_section* ,
fc51264f 2648 const elfcpp::Rela<size, false>& ,
21bb3914
ST		 2649 unsigned int r_type,
2650 Symbol* gsym)
2651{
2652 // When building a shared library, do not fold symbols whose visibility
2653 // is hidden, internal or protected.
2654 return ((parameters->options().shared()
2e702c99 2655 && (gsym->visibility() == elfcpp::STV_INTERNAL
21bb3914
ST		 2656 || gsym->visibility() == elfcpp::STV_PROTECTED
2657 || gsym->visibility() == elfcpp::STV_HIDDEN))
2e702c99 2658 || possible_function_pointer_reloc(r_type));
21bb3914
ST		 2659}
2660
2e30d253
ILT		 2661// Scan a relocation for a global symbol.
2662
fc51264f 2663template<int size>
2e30d253 2664inline void
fc51264f 2665Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2e702c99
RM		 2666 Layout* layout,
2667 Target_x86_64<size>* target,
2668 Sized_relobj_file<size, false>* object,
2669 unsigned int data_shndx,
2670 Output_section* output_section,
2671 const elfcpp::Rela<size, false>& reloc,
2672 unsigned int r_type,
2673 Symbol* gsym)
2e30d253 2674{
7223e9ca
ILT		 2675 // A STT_GNU_IFUNC symbol may require a PLT entry.
2676 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2677 && this->reloc_needs_plt_for_ifunc(object, r_type))
2678 target->make_plt_entry(symtab, layout, gsym);
2679
2e30d253
ILT		 2680 switch (r_type)
2681 {
2682 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 2683 case elfcpp::R_X86_64_GNU_VTINHERIT:
2684 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 2685 break;
2686
2687 case elfcpp::R_X86_64_64:
2e30d253
ILT		 2688 case elfcpp::R_X86_64_32:
2689 case elfcpp::R_X86_64_32S:
2e30d253 2690 case elfcpp::R_X86_64_16:
2e30d253 2691 case elfcpp::R_X86_64_8:
96f2030e 2692 {
2e702c99
RM		 2693 // Make a PLT entry if necessary.
2694 if (gsym->needs_plt_entry())
2695 {
2696 target->make_plt_entry(symtab, layout, gsym);
2697 // Since this is not a PC-relative relocation, we may be
2698 // taking the address of a function. In that case we need to
2699 // set the entry in the dynamic symbol table to the address of
2700 // the PLT entry.
2701 if (gsym->is_from_dynobj() && !parameters->options().shared())
2702 gsym->set_needs_dynsym_value();
2703 }
2704 // Make a dynamic relocation if necessary.
2705 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2706 {
2707 if (gsym->may_need_copy_reloc())
2708 {
2709 target->copy_reloc(symtab, layout, object,
2710 data_shndx, output_section, gsym, reloc);
2711 }
1bae613c
L		 2712 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2713 || (size == 32 && r_type == elfcpp::R_X86_64_32))
7223e9ca
ILT		 2714 && gsym->type() == elfcpp::STT_GNU_IFUNC
2715 && gsym->can_use_relative_reloc(false)
2716 && !gsym->is_from_dynobj()
2717 && !gsym->is_undefined()
2718 && !gsym->is_preemptible())
2719 {
2720 // Use an IRELATIVE reloc for a locally defined
2721 // STT_GNU_IFUNC symbol. This makes a function
2722 // address in a PIE executable match the address in a
2723 // shared library that it links against.
67181c72
ILT		 2724 Reloc_section* rela_dyn =
2725 target->rela_irelative_section(layout);
7223e9ca
ILT		 2726 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
2727 rela_dyn->add_symbolless_global_addend(gsym, r_type,
2728 output_section, object,
2729 data_shndx,
2730 reloc.get_r_offset(),
2731 reloc.get_r_addend());
2732 }
2e702c99
RM		 2733 else if (r_type == elfcpp::R_X86_64_64
2734 && gsym->can_use_relative_reloc(false))
2735 {
2736 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca
ILT		 2737 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
2738 output_section, object,
2739 data_shndx,
2740 reloc.get_r_offset(),
13cf9988 2741 reloc.get_r_addend(), false);
2e702c99
RM		 2742 }
2743 else
2744 {
2745 this->check_non_pic(object, r_type, gsym);
2746 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2747 rela_dyn->add_global(gsym, r_type, output_section, object,
2748 data_shndx, reloc.get_r_offset(),
2749 reloc.get_r_addend());
2750 }
2751 }
d61c6bd4
ILT		 2752 }
2753 break;
2754
2755 case elfcpp::R_X86_64_PC64:
2756 case elfcpp::R_X86_64_PC32:
2757 case elfcpp::R_X86_64_PC16:
2758 case elfcpp::R_X86_64_PC8:
2759 {
2e702c99
RM		 2760 // Make a PLT entry if necessary.
2761 if (gsym->needs_plt_entry())
2762 target->make_plt_entry(symtab, layout, gsym);
2763 // Make a dynamic relocation if necessary.
2764 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2765 {
2766 if (gsym->may_need_copy_reloc())
2767 {
2768 target->copy_reloc(symtab, layout, object,
2769 data_shndx, output_section, gsym, reloc);
2770 }
2771 else
2772 {
2773 this->check_non_pic(object, r_type, gsym);
2774 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2775 rela_dyn->add_global(gsym, r_type, output_section, object,
2776 data_shndx, reloc.get_r_offset(),
2777 reloc.get_r_addend());
2778 }
2779 }
d61c6bd4 2780 }
2e30d253
ILT		 2781 break;
2782
ff006520 2783 case elfcpp::R_X86_64_GOT64:
2e30d253 2784 case elfcpp::R_X86_64_GOT32:
ff006520
ILT		 2785 case elfcpp::R_X86_64_GOTPCREL64:
2786 case elfcpp::R_X86_64_GOTPCREL:
2787 case elfcpp::R_X86_64_GOTPLT64:
2e30d253 2788 {
2e702c99
RM		 2789 // The symbol requires a GOT entry.
2790 Output_data_got<64, false>* got = target->got_section(symtab, layout);
2791 if (gsym->final_value_is_known())
7223e9ca
ILT		 2792 {
2793 // For a STT_GNU_IFUNC symbol we want the PLT address.
2794 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
2795 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2796 else
2797 got->add_global(gsym, GOT_TYPE_STANDARD);
2798 }
2e702c99
RM		 2799 else
2800 {
2801 // If this symbol is not fully resolved, we need to add a
2802 // dynamic relocation for it.
2803 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
07aa62f2
ILT		 2804
2805 // Use a GLOB_DAT rather than a RELATIVE reloc if:
2806 //
2807 // 1) The symbol may be defined in some other module.
2808 //
2809 // 2) We are building a shared library and this is a
2810 // protected symbol; using GLOB_DAT means that the dynamic
2811 // linker can use the address of the PLT in the main
2812 // executable when appropriate so that function address
2813 // comparisons work.
2814 //
2815 // 3) This is a STT_GNU_IFUNC symbol in position dependent
2816 // code, again so that function address comparisons work.
7223e9ca
ILT		 2817 if (gsym->is_from_dynobj()
2818 || gsym->is_undefined()
2819 || gsym->is_preemptible()
07aa62f2
ILT		 2820 || (gsym->visibility() == elfcpp::STV_PROTECTED
2821 && parameters->options().shared())
7223e9ca
ILT		 2822 || (gsym->type() == elfcpp::STT_GNU_IFUNC
2823 && parameters->options().output_is_position_independent()))
2e702c99 2824 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
83896202 2825 elfcpp::R_X86_64_GLOB_DAT);
2e702c99
RM		 2826 else
2827 {
7223e9ca
ILT		 2828 // For a STT_GNU_IFUNC symbol we want to write the PLT
2829 // offset into the GOT, so that function pointer
2830 // comparisons work correctly.
2831 bool is_new;
2832 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
2833 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
2834 else
2835 {
2836 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2837 // Tell the dynamic linker to use the PLT address
2838 // when resolving relocations.
2839 if (gsym->is_from_dynobj()
2840 && !parameters->options().shared())
2841 gsym->set_needs_dynsym_value();
2842 }
2e702c99 2843 if (is_new)
7223e9ca
ILT		 2844 {
2845 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
2846 rela_dyn->add_global_relative(gsym,
2847 elfcpp::R_X86_64_RELATIVE,
13cf9988 2848 got, got_off, 0, false);
7223e9ca 2849 }
2e702c99
RM		 2850 }
2851 }
2852 // For GOTPLT64, we also need a PLT entry (but only if the
2853 // symbol is not fully resolved).
2854 if (r_type == elfcpp::R_X86_64_GOTPLT64
2855 && !gsym->final_value_is_known())
2856 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 2857 }
2858 break;
2859
2860 case elfcpp::R_X86_64_PLT32:
2861 // If the symbol is fully resolved, this is just a PC32 reloc.
2862 // Otherwise we need a PLT entry.
2863 if (gsym->final_value_is_known())
2864 break;
96f2030e
ILT		 2865 // If building a shared library, we can also skip the PLT entry
2866 // if the symbol is defined in the output file and is protected
2867 // or hidden.
2868 if (gsym->is_defined()
2e702c99
RM		 2869 && !gsym->is_from_dynobj()
2870 && !gsym->is_preemptible())
96f2030e 2871 break;
2e30d253
ILT		 2872 target->make_plt_entry(symtab, layout, gsym);
2873 break;
2874
fdc2f80f 2875 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 2876 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 2877 case elfcpp::R_X86_64_GOTPC64:
2878 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 2879 // We need a GOT section.
2880 target->got_section(symtab, layout);
ee9e9e86
ILT		 2881 // For PLTOFF64, we also need a PLT entry (but only if the
2882 // symbol is not fully resolved).
2883 if (r_type == elfcpp::R_X86_64_PLTOFF64
2884 && !gsym->final_value_is_known())
2885 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 2886 break;
2887
2e30d253
ILT		 2888 case elfcpp::R_X86_64_COPY:
2889 case elfcpp::R_X86_64_GLOB_DAT:
2890 case elfcpp::R_X86_64_JUMP_SLOT:
2891 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2892 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 2893 // These are outstanding tls relocs, which are unexpected when linking
e822f2b1 2894 case elfcpp::R_X86_64_TPOFF64:
2e30d253 2895 case elfcpp::R_X86_64_DTPMOD64:
e822f2b1 2896 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 2897 gold_error(_("%s: unexpected reloc %u in object file"),
2898 object->name().c_str(), r_type);
2e30d253 2899 break;
2e30d253 2900
d61c17ea 2901 // These are initial tls relocs, which are expected for global()
56622147
ILT		 2902 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2903 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 2904 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 2905 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 2906 case elfcpp::R_X86_64_DTPOFF32:
2907 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 2908 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2909 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253
ILT		 2910 {
2911 const bool is_final = gsym->final_value_is_known();
e041f13d 2912 const tls::Tls_optimization optimized_type
2e702c99 2913 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 2914 switch (r_type)
2915 {
2e702c99 2916 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 2917 if (optimized_type == tls::TLSOPT_NONE)
2918 {
2e702c99
RM		 2919 // Create a pair of GOT entries for the module index and
2920 // dtv-relative offset.
2921 Output_data_got<64, false>* got
2922 = target->got_section(symtab, layout);
2923 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
83896202
ILT		 2924 target->rela_dyn_section(layout),
2925 elfcpp::R_X86_64_DTPMOD64,
2926 elfcpp::R_X86_64_DTPOFF64);
7bf1f802
ILT		 2927 }
2928 else if (optimized_type == tls::TLSOPT_TO_IE)
2929 {
2e702c99
RM		 2930 // Create a GOT entry for the tp-relative offset.
2931 Output_data_got<64, false>* got
2932 = target->got_section(symtab, layout);
2933 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 2934 target->rela_dyn_section(layout),
2935 elfcpp::R_X86_64_TPOFF64);
7bf1f802
ILT		 2936 }
2937 else if (optimized_type != tls::TLSOPT_TO_LE)
2938 unsupported_reloc_global(object, r_type, gsym);
2939 break;
2940
2e702c99
RM		 2941 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2942 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 2943 if (optimized_type == tls::TLSOPT_NONE)
2944 {
2e702c99
RM		 2945 // Create reserved PLT and GOT entries for the resolver.
2946 target->reserve_tlsdesc_entries(symtab, layout);
2947
2948 // Create a double GOT entry with an R_X86_64_TLSDESC
2949 // reloc. The R_X86_64_TLSDESC reloc is resolved
2950 // lazily, so the GOT entry needs to be in an area in
2951 // .got.plt, not .got. Call got_section to make sure
2952 // the section has been created.
a8df5856 2953 target->got_section(symtab, layout);
2e702c99 2954 Output_data_got<64, false>* got = target->got_tlsdesc_section();
ca09d69a 2955 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2e702c99 2956 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
83896202 2957 elfcpp::R_X86_64_TLSDESC, 0);
c2b45e22
CC		 2958 }
2959 else if (optimized_type == tls::TLSOPT_TO_IE)
2960 {
2e702c99
RM		 2961 // Create a GOT entry for the tp-relative offset.
2962 Output_data_got<64, false>* got
2963 = target->got_section(symtab, layout);
2964 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 2965 target->rela_dyn_section(layout),
2966 elfcpp::R_X86_64_TPOFF64);
c2b45e22
CC		 2967 }
2968 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 2969 unsupported_reloc_global(object, r_type, gsym);
2e30d253
ILT		 2970 break;
2971
2e702c99 2972 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 2973 break;
2974
2e702c99 2975 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 2976 if (optimized_type == tls::TLSOPT_NONE)
2977 {
2e702c99
RM		 2978 // Create a GOT entry for the module index.
2979 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 2980 }
2981 else if (optimized_type != tls::TLSOPT_TO_LE)
2982 unsupported_reloc_global(object, r_type, gsym);
2983 break;
2984
2e702c99
RM		 2985 case elfcpp::R_X86_64_DTPOFF32:
2986 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 2987 break;
2988
2e702c99 2989 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 2990 layout->set_has_static_tls();
2e702c99
RM		 2991 if (optimized_type == tls::TLSOPT_NONE)
2992 {
2993 // Create a GOT entry for the tp-relative offset.
2994 Output_data_got<64, false>* got
2995 = target->got_section(symtab, layout);
2996 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 2997 target->rela_dyn_section(layout),
2998 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 2999 }
3000 else if (optimized_type != tls::TLSOPT_TO_LE)
3001 unsupported_reloc_global(object, r_type, gsym);
3002 break;
0ffd9845 3003
2e702c99 3004 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 3005 layout->set_has_static_tls();
2e702c99
RM		 3006 if (parameters->options().shared())
3007 unsupported_reloc_local(object, r_type);
2e30d253 3008 break;
e041f13d 3009
2e702c99
RM		 3010 default:
3011 gold_unreachable();
2e30d253
ILT		 3012 }
3013 }
3014 break;
fdc2f80f
ILT		 3015
3016 case elfcpp::R_X86_64_SIZE32:
3017 case elfcpp::R_X86_64_SIZE64:
2e30d253 3018 default:
75f2446e 3019 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 3020 object->name().c_str(), r_type,
2e702c99 3021 gsym->demangled_name().c_str());
2e30d253
ILT		 3022 break;
3023 }
3024}
3025
fc51264f 3026template<int size>
6d03d481 3027void
fc51264f
L		 3028Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
3029 Layout* layout,
3030 Sized_relobj_file<size, false>* object,
3031 unsigned int data_shndx,
3032 unsigned int sh_type,
3033 const unsigned char* prelocs,
3034 size_t reloc_count,
3035 Output_section* output_section,
3036 bool needs_special_offset_handling,
3037 size_t local_symbol_count,
3038 const unsigned char* plocal_symbols)
6d03d481
ST		 3039{
3040
3041 if (sh_type == elfcpp::SHT_REL)
3042 {
3043 return;
3044 }
3045
fc51264f 3046 gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
2e702c99 3047 typename Target_x86_64<size>::Scan,
618d6666 3048 typename Target_x86_64<size>::Relocatable_size_for_reloc>(
6d03d481
ST		 3049 symtab,
3050 layout,
3051 this,
3052 object,
3053 data_shndx,
3054 prelocs,
3055 reloc_count,
3056 output_section,
3057 needs_special_offset_handling,
3058 local_symbol_count,
3059 plocal_symbols);
2e702c99 3060
6d03d481 3061}
2e30d253
ILT		 3062// Scan relocations for a section.
3063
fc51264f 3064template<int size>
2e30d253 3065void
fc51264f
L		 3066Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
3067 Layout* layout,
3068 Sized_relobj_file<size, false>* object,
3069 unsigned int data_shndx,
3070 unsigned int sh_type,
3071 const unsigned char* prelocs,
3072 size_t reloc_count,
3073 Output_section* output_section,
3074 bool needs_special_offset_handling,
3075 size_t local_symbol_count,
3076 const unsigned char* plocal_symbols)
2e30d253
ILT		 3077{
3078 if (sh_type == elfcpp::SHT_REL)
3079 {
75f2446e
ILT		 3080 gold_error(_("%s: unsupported REL reloc section"),
3081 object->name().c_str());
3082 return;
2e30d253
ILT		 3083 }
3084
fc51264f 3085 gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
618d6666 3086 typename Target_x86_64<size>::Scan>(
2e30d253
ILT		 3087 symtab,
3088 layout,
3089 this,
3090 object,
3091 data_shndx,
3092 prelocs,
3093 reloc_count,
730cdc88
ILT		 3094 output_section,
3095 needs_special_offset_handling,
2e30d253 3096 local_symbol_count,
730cdc88 3097 plocal_symbols);
2e30d253
ILT		 3098}
3099
3100// Finalize the sections.
3101
fc51264f 3102template<int size>
2e30d253 3103void
fc51264f 3104Target_x86_64<size>::do_finalize_sections(
f59f41f3
DK		 3105 Layout* layout,
3106 const Input_objects*,
e785ec03 3107 Symbol_table* symtab)
2e30d253 3108{
ea715a34
ILT		 3109 const Reloc_section* rel_plt = (this->plt_ == NULL
3110 ? NULL
e291e7b9 3111 : this->plt_->rela_plt());
ea715a34 3112 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
612a8d3d 3113 this->rela_dyn_, true, false);
2e702c99 3114
2e30d253
ILT		 3115 // Fill in some more dynamic tags.
3116 Output_data_dynamic* const odyn = layout->dynamic_data();
3117 if (odyn != NULL)
3118 {
22b127cc 3119 if (this->plt_ != NULL
ea715a34
ILT		 3120 && this->plt_->output_section() != NULL
3121 && this->plt_->has_tlsdesc_entry())
2e30d253 3122 {
ea715a34
ILT		 3123 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
3124 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
3125 this->got_->finalize_data_size();
3126 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
3127 this->plt_, plt_offset);
3128 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
3129 this->got_, got_offset);
2e30d253
ILT		 3130 }
3131 }
3132
3133 // Emit any relocs we saved in an attempt to avoid generating COPY
3134 // relocs.
12c0daef
ILT		 3135 if (this->copy_relocs_.any_saved_relocs())
3136 this->copy_relocs_.emit(this->rela_dyn_section(layout));
e785ec03
ILT		 3137
3138 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3139 // the .got.plt section.
3140 Symbol* sym = this->global_offset_table_;
3141 if (sym != NULL)
3142 {
3143 uint64_t data_size = this->got_plt_->current_data_size();
fc51264f 3144 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
e785ec03 3145 }
28a13fec 3146
67181c72
ILT		 3147 if (parameters->doing_static_link()
3148 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
28a13fec
ILT		 3149 {
3150 // If linking statically, make sure that the __rela_iplt symbols
3151 // were defined if necessary, even if we didn't create a PLT.
3152 static const Define_symbol_in_segment syms[] =
3153 {
3154 {
3155 "__rela_iplt_start", // name
3156 elfcpp::PT_LOAD, // segment_type
3157 elfcpp::PF_W, // segment_flags_set
3158 elfcpp::PF(0), // segment_flags_clear
3159 0, // value
3160 0, // size
3161 elfcpp::STT_NOTYPE, // type
3162 elfcpp::STB_GLOBAL, // binding
3163 elfcpp::STV_HIDDEN, // visibility
3164 0, // nonvis
3165 Symbol::SEGMENT_START, // offset_from_base
3166 true // only_if_ref
3167 },
3168 {
3169 "__rela_iplt_end", // name
3170 elfcpp::PT_LOAD, // segment_type
3171 elfcpp::PF_W, // segment_flags_set
3172 elfcpp::PF(0), // segment_flags_clear
3173 0, // value
3174 0, // size
3175 elfcpp::STT_NOTYPE, // type
3176 elfcpp::STB_GLOBAL, // binding
3177 elfcpp::STV_HIDDEN, // visibility
3178 0, // nonvis
3179 Symbol::SEGMENT_START, // offset_from_base
3180 true // only_if_ref
3181 }
3182 };
3183
3184 symtab->define_symbols(layout, 2, syms,
3185 layout->script_options()->saw_sections_clause());
3186 }
2e30d253
ILT		 3187}
3188
3189// Perform a relocation.
3190
fc51264f 3191template<int size>
2e30d253 3192inline bool
fc51264f
L		 3193Target_x86_64<size>::Relocate::relocate(
3194 const Relocate_info<size, false>* relinfo,
3195 Target_x86_64<size>* target,
3196 Output_section*,
3197 size_t relnum,
3198 const elfcpp::Rela<size, false>& rela,
3199 unsigned int r_type,
3200 const Sized_symbol<size>* gsym,
3201 const Symbol_value<size>* psymval,
3202 unsigned char* view,
3203 typename elfcpp::Elf_types<size>::Elf_Addr address,
3204 section_size_type view_size)
2e30d253
ILT		 3205{
3206 if (this->skip_call_tls_get_addr_)
3207 {
5efc7cd2 3208 if ((r_type != elfcpp::R_X86_64_PLT32
2e702c99 3209 && r_type != elfcpp::R_X86_64_PC32)
2e30d253 3210 || gsym == NULL
0ffd9845 3211 || strcmp(gsym->name(), "__tls_get_addr") != 0)
2e30d253 3212 {
75f2446e
ILT		 3213 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3214 _("missing expected TLS relocation"));
3215 }
3216 else
3217 {
3218 this->skip_call_tls_get_addr_ = false;
3219 return false;
2e30d253 3220 }
2e30d253
ILT		 3221 }
3222
fc51264f 3223 const Sized_relobj_file<size, false>* object = relinfo->object;
7223e9ca
ILT		 3224
3225 // Pick the value to use for symbols defined in the PLT.
fc51264f 3226 Symbol_value<size> symval;
96f2030e 3227 if (gsym != NULL
95a2c8d6 3228 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
2e30d253 3229 {
67181c72 3230 symval.set_output_value(target->plt_address_for_global(gsym)
2e30d253
ILT		 3231 + gsym->plt_offset());
3232 psymval = &symval;
3233 }
7223e9ca
ILT		 3234 else if (gsym == NULL && psymval->is_ifunc_symbol())
3235 {
fc51264f 3236 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7223e9ca
ILT		 3237 if (object->local_has_plt_offset(r_sym))
3238 {
67181c72 3239 symval.set_output_value(target->plt_address_for_local(object, r_sym)
7223e9ca
ILT		 3240 + object->local_plt_offset(r_sym));
3241 psymval = &symval;
3242 }
3243 }
2e30d253 3244
0ffd9845
ILT		 3245 const elfcpp::Elf_Xword addend = rela.get_r_addend();
3246
3247 // Get the GOT offset if needed.
96f2030e
ILT		 3248 // The GOT pointer points to the end of the GOT section.
3249 // We need to subtract the size of the GOT section to get
3250 // the actual offset to use in the relocation.
0ffd9845
ILT		 3251 bool have_got_offset = false;
3252 unsigned int got_offset = 0;
3253 switch (r_type)
3254 {
3255 case elfcpp::R_X86_64_GOT32:
3256 case elfcpp::R_X86_64_GOT64:
3257 case elfcpp::R_X86_64_GOTPLT64:
3258 case elfcpp::R_X86_64_GOTPCREL:
3259 case elfcpp::R_X86_64_GOTPCREL64:
3260 if (gsym != NULL)
2e702c99
RM		 3261 {
3262 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3263 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3264 }
0ffd9845 3265 else
2e702c99
RM		 3266 {
3267 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3268 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3269 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3270 - target->got_size());
3271 }
0ffd9845
ILT		 3272 have_got_offset = true;
3273 break;
3274
3275 default:
3276 break;
3277 }
2e30d253
ILT		 3278
3279 switch (r_type)
3280 {
3281 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 3282 case elfcpp::R_X86_64_GNU_VTINHERIT:
3283 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 3284 break;
3285
3286 case elfcpp::R_X86_64_64:
fc51264f 3287 Relocate_functions<size, false>::rela64(view, object, psymval, addend);
2e30d253
ILT		 3288 break;
3289
3290 case elfcpp::R_X86_64_PC64:
fc51264f 3291 Relocate_functions<size, false>::pcrela64(view, object, psymval, addend,
2e702c99 3292 address);
2e30d253
ILT		 3293 break;
3294
3295 case elfcpp::R_X86_64_32:
7bb3655e
ILT		 3296 // FIXME: we need to verify that value + addend fits into 32 bits:
3297 // uint64_t x = value + addend;
3298 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
3299 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
fc51264f 3300 Relocate_functions<size, false>::rela32(view, object, psymval, addend);
2e30d253
ILT		 3301 break;
3302
3303 case elfcpp::R_X86_64_32S:
7bb3655e
ILT		 3304 // FIXME: we need to verify that value + addend fits into 32 bits:
3305 // int64_t x = value + addend; // note this quantity is signed!
3306 // x == static_cast<int64_t>(static_cast<int32_t>(x))
fc51264f 3307 Relocate_functions<size, false>::rela32(view, object, psymval, addend);
2e30d253
ILT		 3308 break;
3309
3310 case elfcpp::R_X86_64_PC32:
fc51264f
L		 3311 Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
3312 address);
2e30d253
ILT		 3313 break;
3314
3315 case elfcpp::R_X86_64_16:
fc51264f 3316 Relocate_functions<size, false>::rela16(view, object, psymval, addend);
2e30d253
ILT		 3317 break;
3318
3319 case elfcpp::R_X86_64_PC16:
fc51264f
L		 3320 Relocate_functions<size, false>::pcrela16(view, object, psymval, addend,
3321 address);
2e30d253
ILT		 3322 break;
3323
3324 case elfcpp::R_X86_64_8:
fc51264f 3325 Relocate_functions<size, false>::rela8(view, object, psymval, addend);
2e30d253
ILT		 3326 break;
3327
3328 case elfcpp::R_X86_64_PC8:
fc51264f
L		 3329 Relocate_functions<size, false>::pcrela8(view, object, psymval, addend,
3330 address);
2e30d253
ILT		 3331 break;
3332
3333 case elfcpp::R_X86_64_PLT32:
f389a824 3334 gold_assert(gsym == NULL
2e702c99 3335 || gsym->has_plt_offset()
99f8faca
ILT		 3336 || gsym->final_value_is_known()
3337 || (gsym->is_defined()
3338 && !gsym->is_from_dynobj()
3339 && !gsym->is_preemptible()));
ee9e9e86
ILT		 3340 // Note: while this code looks the same as for R_X86_64_PC32, it
3341 // behaves differently because psymval was set to point to
3342 // the PLT entry, rather than the symbol, in Scan::global().
fc51264f
L		 3343 Relocate_functions<size, false>::pcrela32(view, object, psymval, addend,
3344 address);
2e30d253
ILT		 3345 break;
3346
ee9e9e86
ILT		 3347 case elfcpp::R_X86_64_PLTOFF64:
3348 {
2e702c99
RM		 3349 gold_assert(gsym);
3350 gold_assert(gsym->has_plt_offset()
3351 || gsym->final_value_is_known());
fc51264f 3352 typename elfcpp::Elf_types<size>::Elf_Addr got_address;
ee9e9e86 3353 got_address = target->got_section(NULL, NULL)->address();
fc51264f
L		 3354 Relocate_functions<size, false>::rela64(view, object, psymval,
3355 addend - got_address);
ee9e9e86
ILT		 3356 }
3357
2e30d253 3358 case elfcpp::R_X86_64_GOT32:
0ffd9845 3359 gold_assert(have_got_offset);
fc51264f 3360 Relocate_functions<size, false>::rela32(view, got_offset, addend);
2e30d253
ILT		 3361 break;
3362
e822f2b1
ILT		 3363 case elfcpp::R_X86_64_GOTPC32:
3364 {
2e702c99 3365 gold_assert(gsym);
fc51264f 3366 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 3367 value = target->got_plt_section()->address();
fc51264f 3368 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
e822f2b1
ILT		 3369 }
3370 break;
3371
3372 case elfcpp::R_X86_64_GOT64:
3373 // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
3374 // Since we always add a PLT entry, this is equivalent.
fdc2f80f 3375 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845 3376 gold_assert(have_got_offset);
fc51264f 3377 Relocate_functions<size, false>::rela64(view, got_offset, addend);
e822f2b1
ILT		 3378 break;
3379
3380 case elfcpp::R_X86_64_GOTPC64:
3381 {
2e702c99 3382 gold_assert(gsym);
fc51264f 3383 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 3384 value = target->got_plt_section()->address();
fc51264f 3385 Relocate_functions<size, false>::pcrela64(view, value, addend, address);
e822f2b1
ILT		 3386 }
3387 break;
3388
2e30d253
ILT		 3389 case elfcpp::R_X86_64_GOTOFF64:
3390 {
fc51264f 3391 typename elfcpp::Elf_types<size>::Elf_Addr value;
2e30d253 3392 value = (psymval->value(object, 0)
96f2030e 3393 - target->got_plt_section()->address());
fc51264f 3394 Relocate_functions<size, false>::rela64(view, value, addend);
2e30d253
ILT		 3395 }
3396 break;
3397
3398 case elfcpp::R_X86_64_GOTPCREL:
3399 {
2e702c99
RM		 3400 gold_assert(have_got_offset);
3401 typename elfcpp::Elf_types<size>::Elf_Addr value;
3402 value = target->got_plt_section()->address() + got_offset;
3403 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
2e30d253
ILT		 3404 }
3405 break;
3406
e822f2b1
ILT		 3407 case elfcpp::R_X86_64_GOTPCREL64:
3408 {
2e702c99
RM		 3409 gold_assert(have_got_offset);
3410 typename elfcpp::Elf_types<size>::Elf_Addr value;
3411 value = target->got_plt_section()->address() + got_offset;
3412 Relocate_functions<size, false>::pcrela64(view, value, addend, address);
e822f2b1
ILT		 3413 }
3414 break;
3415
2e30d253
ILT		 3416 case elfcpp::R_X86_64_COPY:
3417 case elfcpp::R_X86_64_GLOB_DAT:
3418 case elfcpp::R_X86_64_JUMP_SLOT:
3419 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3420 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3421 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 3422 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3423 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 3424 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3425 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3426 _("unexpected reloc %u in object file"),
3427 r_type);
2e30d253
ILT		 3428 break;
3429
d61c17ea 3430 // These are initial tls relocs, which are expected when linking
56622147
ILT		 3431 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3432 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3433 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3434 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3435 case elfcpp::R_X86_64_DTPOFF32:
3436 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3437 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3438 case elfcpp::R_X86_64_TPOFF32: // Local-exec
7bf1f802 3439 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
2e702c99 3440 view, address, view_size);
2e30d253 3441 break;
2e30d253 3442
fdc2f80f
ILT		 3443 case elfcpp::R_X86_64_SIZE32:
3444 case elfcpp::R_X86_64_SIZE64:
2e30d253 3445 default:
75f2446e
ILT		 3446 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3447 _("unsupported reloc %u"),
3448 r_type);
2e30d253
ILT		 3449 break;
3450 }
3451
3452 return true;
3453}
3454
3455// Perform a TLS relocation.
3456
fc51264f 3457template<int size>
2e30d253 3458inline void
fc51264f
L		 3459Target_x86_64<size>::Relocate::relocate_tls(
3460 const Relocate_info<size, false>* relinfo,
3461 Target_x86_64<size>* target,
3462 size_t relnum,
3463 const elfcpp::Rela<size, false>& rela,
3464 unsigned int r_type,
3465 const Sized_symbol<size>* gsym,
3466 const Symbol_value<size>* psymval,
3467 unsigned char* view,
3468 typename elfcpp::Elf_types<size>::Elf_Addr address,
3469 section_size_type view_size)
2e30d253 3470{
2e30d253 3471 Output_segment* tls_segment = relinfo->layout->tls_segment();
7bf1f802 3472
fc51264f 3473 const Sized_relobj_file<size, false>* object = relinfo->object;
6a41d30b 3474 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 3475 elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
36171d64 3476 bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
2e30d253 3477
fc51264f 3478 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
2e30d253
ILT		 3479
3480 const bool is_final = (gsym == NULL
b3705d2a 3481 ? !parameters->options().shared()
2e30d253 3482 : gsym->final_value_is_known());
36171d64 3483 tls::Tls_optimization optimized_type
fc51264f 3484 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 3485 switch (r_type)
3486 {
56622147 3487 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
36171d64
CC		 3488 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3489 {
3490 // If this code sequence is used in a non-executable section,
3491 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3492 // on the assumption that it's being used by itself in a debug
3493 // section. Therefore, in the unlikely event that the code
3494 // sequence appears in a non-executable section, we simply
3495 // leave it unoptimized.
3496 optimized_type = tls::TLSOPT_NONE;
3497 }
e041f13d 3498 if (optimized_type == tls::TLSOPT_TO_LE)
2e30d253 3499 {
62855347
ILT		 3500 if (tls_segment == NULL)
3501 {
191f1a2d
ILT		 3502 gold_assert(parameters->errors()->error_count() > 0
3503 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3504 return;
3505 }
2e30d253 3506 this->tls_gd_to_le(relinfo, relnum, tls_segment,
72ec2876 3507 rela, r_type, value, view,
2e30d253
ILT		 3508 view_size);
3509 break;
3510 }
7bf1f802 3511 else
2e702c99
RM		 3512 {
3513 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3514 ? GOT_TYPE_TLS_OFFSET
3515 : GOT_TYPE_TLS_PAIR);
3516 unsigned int got_offset;
3517 if (gsym != NULL)
3518 {
3519 gold_assert(gsym->has_got_offset(got_type));
3520 got_offset = gsym->got_offset(got_type) - target->got_size();
3521 }
3522 else
3523 {
3524 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3525 gold_assert(object->local_has_got_offset(r_sym, got_type));
3526 got_offset = (object->local_got_offset(r_sym, got_type)
3527 - target->got_size());
3528 }
3529 if (optimized_type == tls::TLSOPT_TO_IE)
3530 {
3531 value = target->got_plt_section()->address() + got_offset;
3532 this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
3533 value, view, address, view_size);
3534 break;
3535 }
3536 else if (optimized_type == tls::TLSOPT_NONE)
3537 {
3538 // Relocate the field with the offset of the pair of GOT
3539 // entries.
6a41d30b 3540 value = target->got_plt_section()->address() + got_offset;
2e702c99 3541 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3542 address);
2e702c99
RM		 3543 break;
3544 }
3545 }
72ec2876 3546 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 3547 _("unsupported reloc %u"), r_type);
2e30d253
ILT		 3548 break;
3549
c2b45e22
CC		 3550 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3551 case elfcpp::R_X86_64_TLSDESC_CALL:
36171d64
CC		 3552 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3553 {
3554 // See above comment for R_X86_64_TLSGD.
3555 optimized_type = tls::TLSOPT_NONE;
3556 }
c2b45e22
CC		 3557 if (optimized_type == tls::TLSOPT_TO_LE)
3558 {
62855347
ILT		 3559 if (tls_segment == NULL)
3560 {
191f1a2d
ILT		 3561 gold_assert(parameters->errors()->error_count() > 0
3562 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3563 return;
3564 }
c2b45e22 3565 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2e702c99
RM		 3566 rela, r_type, value, view,
3567 view_size);
c2b45e22
CC		 3568 break;
3569 }
3570 else
2e702c99
RM		 3571 {
3572 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3573 ? GOT_TYPE_TLS_OFFSET
3574 : GOT_TYPE_TLS_DESC);
3575 unsigned int got_offset = 0;
a8df5856
ILT		 3576 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
3577 && optimized_type == tls::TLSOPT_NONE)
3578 {
3579 // We created GOT entries in the .got.tlsdesc portion of
3580 // the .got.plt section, but the offset stored in the
3581 // symbol is the offset within .got.tlsdesc.
3582 got_offset = (target->got_size()
3583 + target->got_plt_section()->data_size());
3584 }
2e702c99
RM		 3585 if (gsym != NULL)
3586 {
3587 gold_assert(gsym->has_got_offset(got_type));
3588 got_offset += gsym->got_offset(got_type) - target->got_size();
3589 }
3590 else
3591 {
3592 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3593 gold_assert(object->local_has_got_offset(r_sym, got_type));
3594 got_offset += (object->local_got_offset(r_sym, got_type)
a8df5856 3595 - target->got_size());
2e702c99
RM		 3596 }
3597 if (optimized_type == tls::TLSOPT_TO_IE)
3598 {
62855347
ILT		 3599 if (tls_segment == NULL)
3600 {
191f1a2d
ILT		 3601 gold_assert(parameters->errors()->error_count() > 0
3602 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3603 return;
3604 }
2e702c99
RM		 3605 value = target->got_plt_section()->address() + got_offset;
3606 this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
3607 rela, r_type, value, view, address,
3608 view_size);
3609 break;
3610 }
3611 else if (optimized_type == tls::TLSOPT_NONE)
3612 {
3613 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3614 {
3615 // Relocate the field with the offset of the pair of GOT
3616 // entries.
3617 value = target->got_plt_section()->address() + got_offset;
3618 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3619 address);
2e702c99
RM		 3620 }
3621 break;
3622 }
3623 }
c2b45e22
CC		 3624 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3625 _("unsupported reloc %u"), r_type);
3626 break;
3627
56622147 3628 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
36171d64
CC		 3629 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3630 {
3631 // See above comment for R_X86_64_TLSGD.
3632 optimized_type = tls::TLSOPT_NONE;
3633 }
e041f13d 3634 if (optimized_type == tls::TLSOPT_TO_LE)
2e702c99 3635 {
62855347
ILT		 3636 if (tls_segment == NULL)
3637 {
191f1a2d
ILT		 3638 gold_assert(parameters->errors()->error_count() > 0
3639 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3640 return;
3641 }
72ec2876
ILT		 3642 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
3643 value, view, view_size);
3644 break;
2e702c99 3645 }
7bf1f802 3646 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 3647 {
3648 // Relocate the field with the offset of the GOT entry for
3649 // the module index.
3650 unsigned int got_offset;
3651 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
31d60480 3652 - target->got_size());
6a41d30b 3653 value = target->got_plt_section()->address() + got_offset;
2e702c99 3654 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3655 address);
2e702c99
RM		 3656 break;
3657 }
72ec2876 3658 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 3659 _("unsupported reloc %u"), r_type);
2e30d253 3660 break;
0ffd9845
ILT		 3661
3662 case elfcpp::R_X86_64_DTPOFF32:
36171d64
CC		 3663 // This relocation type is used in debugging information.
3664 // In that case we need to not optimize the value. If the
3665 // section is not executable, then we assume we should not
3666 // optimize this reloc. See comments above for R_X86_64_TLSGD,
3667 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
3668 // R_X86_64_TLSLD.
3669 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3670 {
62855347
ILT		 3671 if (tls_segment == NULL)
3672 {
191f1a2d
ILT		 3673 gold_assert(parameters->errors()->error_count() > 0
3674 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3675 return;
3676 }
36171d64
CC		 3677 value -= tls_segment->memsz();
3678 }
fc51264f 3679 Relocate_functions<size, false>::rela32(view, value, addend);
0ffd9845
ILT		 3680 break;
3681
3682 case elfcpp::R_X86_64_DTPOFF64:
36171d64
CC		 3683 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
3684 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3685 {
62855347
ILT		 3686 if (tls_segment == NULL)
3687 {
191f1a2d
ILT		 3688 gold_assert(parameters->errors()->error_count() > 0
3689 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3690 return;
3691 }
36171d64
CC		 3692 value -= tls_segment->memsz();
3693 }
fc51264f 3694 Relocate_functions<size, false>::rela64(view, value, addend);
0ffd9845 3695 break;
2e30d253 3696
56622147
ILT		 3697 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3698 if (optimized_type == tls::TLSOPT_TO_LE)
3699 {
62855347
ILT		 3700 if (tls_segment == NULL)
3701 {
191f1a2d
ILT		 3702 gold_assert(parameters->errors()->error_count() > 0
3703 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3704 return;
3705 }
fc51264f
L		 3706 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3707 tls_segment, rela,
3708 r_type, value, view,
3709 view_size);
56622147
ILT		 3710 break;
3711 }
7bf1f802 3712 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 3713 {
3714 // Relocate the field with the offset of the GOT entry for
3715 // the tp-relative offset of the symbol.
3716 unsigned int got_offset;
3717 if (gsym != NULL)
3718 {
3719 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
3720 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
3721 - target->got_size());
3722 }
3723 else
3724 {
3725 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3726 gold_assert(object->local_has_got_offset(r_sym,
3727 GOT_TYPE_TLS_OFFSET));
3728 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
3729 - target->got_size());
3730 }
6a41d30b 3731 value = target->got_plt_section()->address() + got_offset;
2e702c99 3732 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3733 address);
2e702c99
RM		 3734 break;
3735 }
56622147
ILT		 3736 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3737 _("unsupported reloc type %u"),
3738 r_type);
3739 break;
0ffd9845 3740
56622147 3741 case elfcpp::R_X86_64_TPOFF32: // Local-exec
62855347
ILT		 3742 if (tls_segment == NULL)
3743 {
191f1a2d
ILT		 3744 gold_assert(parameters->errors()->error_count() > 0
3745 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3746 return;
3747 }
6a41d30b 3748 value -= tls_segment->memsz();
fc51264f 3749 Relocate_functions<size, false>::rela32(view, value, addend);
56622147 3750 break;
2e30d253 3751 }
2e30d253
ILT		 3752}
3753
7bf1f802
ILT		 3754// Do a relocation in which we convert a TLS General-Dynamic to an
3755// Initial-Exec.
3756
fc51264f 3757template<int size>
7bf1f802 3758inline void
fc51264f
L		 3759Target_x86_64<size>::Relocate::tls_gd_to_ie(
3760 const Relocate_info<size, false>* relinfo,
3761 size_t relnum,
3762 Output_segment*,
3763 const elfcpp::Rela<size, false>& rela,
3764 unsigned int,
3765 typename elfcpp::Elf_types<size>::Elf_Addr value,
3766 unsigned char* view,
3767 typename elfcpp::Elf_types<size>::Elf_Addr address,
3768 section_size_type view_size)
7bf1f802 3769{
41194d9f
L		 3770 // For SIZE == 64:
3771 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3772 // .word 0x6666; rex64; call __tls_get_addr
3773 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
3774 // For SIZE == 32:
3775 // leaq foo@tlsgd(%rip),%rdi;
3776 // .word 0x6666; rex64; call __tls_get_addr
3777 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
7bf1f802 3778
7bf1f802 3779 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
7bf1f802 3780 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 3781 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
7bf1f802 3782
41194d9f
L		 3783 if (size == 64)
3784 {
3785 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3786 -4);
3787 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3788 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
3789 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3790 16);
3791 }
3792 else
3793 {
3794 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3795 -3);
3796 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3797 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
3798 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
3799 15);
3800 }
7bf1f802 3801
c2b45e22 3802 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f
L		 3803 Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
3804 address);
7bf1f802
ILT		 3805
3806 // The next reloc should be a PLT32 reloc against __tls_get_addr.
3807 // We can skip it.
3808 this->skip_call_tls_get_addr_ = true;
3809}
3810
e041f13d 3811// Do a relocation in which we convert a TLS General-Dynamic to a
2e30d253
ILT		 3812// Local-Exec.
3813
fc51264f 3814template<int size>
2e30d253 3815inline void
fc51264f
L		 3816Target_x86_64<size>::Relocate::tls_gd_to_le(
3817 const Relocate_info<size, false>* relinfo,
3818 size_t relnum,
3819 Output_segment* tls_segment,
3820 const elfcpp::Rela<size, false>& rela,
3821 unsigned int,
3822 typename elfcpp::Elf_types<size>::Elf_Addr value,
3823 unsigned char* view,
3824 section_size_type view_size)
2e30d253 3825{
41194d9f
L		 3826 // For SIZE == 64:
3827 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
3828 // .word 0x6666; rex64; call __tls_get_addr
3829 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
3830 // For SIZE == 32:
3831 // leaq foo@tlsgd(%rip),%rdi;
3832 // .word 0x6666; rex64; call __tls_get_addr
3833 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
2e30d253 3834
72ec2876 3835 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
72ec2876 3836 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
41194d9f
L		 3837 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
3838
3839 if (size == 64)
3840 {
3841 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3842 -4);
3843 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3844 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
3845 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
3846 16);
3847 }
3848 else
3849 {
3850 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
3851 -3);
3852 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
3853 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
2e30d253 3854
41194d9f
L		 3855 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
3856 15);
3857 }
2e30d253 3858
6a41d30b 3859 value -= tls_segment->memsz();
fc51264f 3860 Relocate_functions<size, false>::rela32(view + 8, value, 0);
2e30d253
ILT		 3861
3862 // The next reloc should be a PLT32 reloc against __tls_get_addr.
3863 // We can skip it.
3864 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 3865}
3866
c2b45e22
CC		 3867// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
3868
fc51264f 3869template<int size>
c2b45e22 3870inline void
fc51264f
L		 3871Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
3872 const Relocate_info<size, false>* relinfo,
c2b45e22
CC		 3873 size_t relnum,
3874 Output_segment*,
fc51264f 3875 const elfcpp::Rela<size, false>& rela,
c2b45e22 3876 unsigned int r_type,
fc51264f 3877 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 3878 unsigned char* view,
fc51264f 3879 typename elfcpp::Elf_types<size>::Elf_Addr address,
c2b45e22
CC		 3880 section_size_type view_size)
3881{
3882 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3883 {
3884 // leaq foo@tlsdesc(%rip), %rax
3885 // ==> movq foo@gottpoff(%rip), %rax
3886 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3887 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
3888 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 3889 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 3890 view[-2] = 0x8b;
3891 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 3892 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
c2b45e22
CC		 3893 }
3894 else
3895 {
3896 // call *foo@tlscall(%rax)
3897 // ==> nop; nop
3898 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
3899 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
3900 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 3901 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 3902 view[0] = 0x66;
3903 view[1] = 0x90;
3904 }
3905}
3906
3907// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
3908
fc51264f 3909template<int size>
c2b45e22 3910inline void
fc51264f
L		 3911Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
3912 const Relocate_info<size, false>* relinfo,
c2b45e22
CC		 3913 size_t relnum,
3914 Output_segment* tls_segment,
fc51264f 3915 const elfcpp::Rela<size, false>& rela,
c2b45e22 3916 unsigned int r_type,
fc51264f 3917 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 3918 unsigned char* view,
3919 section_size_type view_size)
3920{
3921 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3922 {
3923 // leaq foo@tlsdesc(%rip), %rax
3924 // ==> movq foo@tpoff, %rax
3925 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3926 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
3927 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 3928 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 3929 view[-2] = 0xc7;
3930 view[-1] = 0xc0;
3931 value -= tls_segment->memsz();
fc51264f 3932 Relocate_functions<size, false>::rela32(view, value, 0);
c2b45e22
CC		 3933 }
3934 else
3935 {
3936 // call *foo@tlscall(%rax)
3937 // ==> nop; nop
3938 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
3939 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
3940 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 3941 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 3942 view[0] = 0x66;
3943 view[1] = 0x90;
3944 }
3945}
3946
fc51264f 3947template<int size>
2e30d253 3948inline void
fc51264f
L		 3949Target_x86_64<size>::Relocate::tls_ld_to_le(
3950 const Relocate_info<size, false>* relinfo,
3951 size_t relnum,
3952 Output_segment*,
3953 const elfcpp::Rela<size, false>& rela,
3954 unsigned int,
3955 typename elfcpp::Elf_types<size>::Elf_Addr,
3956 unsigned char* view,
3957 section_size_type view_size)
2e30d253 3958{
72ec2876
ILT		 3959 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
3960 // ... leq foo@dtpoff(%rax),%reg
3961 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
2e30d253 3962
72ec2876
ILT		 3963 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
3964 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
2e30d253 3965
72ec2876 3966 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 3967 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
72ec2876
ILT		 3968
3969 tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
3970
3971 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
3972
3973 // The next reloc should be a PLT32 reloc against __tls_get_addr.
3974 // We can skip it.
3975 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 3976}
3977
56622147
ILT		 3978// Do a relocation in which we convert a TLS Initial-Exec to a
3979// Local-Exec.
3980
fc51264f 3981template<int size>
56622147 3982inline void
fc51264f
L		 3983Target_x86_64<size>::Relocate::tls_ie_to_le(
3984 const Relocate_info<size, false>* relinfo,
3985 size_t relnum,
3986 Output_segment* tls_segment,
3987 const elfcpp::Rela<size, false>& rela,
3988 unsigned int,
3989 typename elfcpp::Elf_types<size>::Elf_Addr value,
3990 unsigned char* view,
3991 section_size_type view_size)
56622147
ILT		 3992{
3993 // We need to examine the opcodes to figure out which instruction we
3994 // are looking at.
3995
3996 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
3997 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
3998
3999 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4000 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4001
4002 unsigned char op1 = view[-3];
4003 unsigned char op2 = view[-2];
4004 unsigned char op3 = view[-1];
4005 unsigned char reg = op3 >> 3;
4006
4007 if (op2 == 0x8b)
4008 {
4009 // movq
4010 if (op1 == 0x4c)
2e702c99 4011 view[-3] = 0x49;
56622147
ILT		 4012 view[-2] = 0xc7;
4013 view[-1] = 0xc0 | reg;
4014 }
4015 else if (reg == 4)
4016 {
4017 // Special handling for %rsp.
4018 if (op1 == 0x4c)
2e702c99 4019 view[-3] = 0x49;
56622147
ILT		 4020 view[-2] = 0x81;
4021 view[-1] = 0xc0 | reg;
4022 }
4023 else
4024 {
4025 // addq
4026 if (op1 == 0x4c)
2e702c99 4027 view[-3] = 0x4d;
56622147
ILT		 4028 view[-2] = 0x8d;
4029 view[-1] = 0x80 | reg | (reg << 3);
4030 }
4031
6a41d30b 4032 value -= tls_segment->memsz();
fc51264f 4033 Relocate_functions<size, false>::rela32(view, value, 0);
56622147
ILT		 4034}
4035
2e30d253
ILT		 4036// Relocate section data.
4037
fc51264f 4038template<int size>
2e30d253 4039void
fc51264f
L		 4040Target_x86_64<size>::relocate_section(
4041 const Relocate_info<size, false>* relinfo,
364c7fa5
ILT		 4042 unsigned int sh_type,
4043 const unsigned char* prelocs,
4044 size_t reloc_count,
4045 Output_section* output_section,
4046 bool needs_special_offset_handling,
4047 unsigned char* view,
fc51264f 4048 typename elfcpp::Elf_types<size>::Elf_Addr address,
364c7fa5
ILT		 4049 section_size_type view_size,
4050 const Reloc_symbol_changes* reloc_symbol_changes)
2e30d253
ILT		 4051{
4052 gold_assert(sh_type == elfcpp::SHT_RELA);
4053
fc51264f 4054 gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA,
618d6666 4055 typename Target_x86_64<size>::Relocate>(
2e30d253
ILT		 4056 relinfo,
4057 this,
4058 prelocs,
4059 reloc_count,
730cdc88
ILT		 4060 output_section,
4061 needs_special_offset_handling,
2e30d253
ILT		 4062 view,
4063 address,
364c7fa5
ILT		 4064 view_size,
4065 reloc_symbol_changes);
2e30d253
ILT		 4066}
4067
94a3fc8b
CC		 4068// Apply an incremental relocation. Incremental relocations always refer
4069// to global symbols.
4070
fc51264f 4071template<int size>
94a3fc8b 4072void
fc51264f
L		 4073Target_x86_64<size>::apply_relocation(
4074 const Relocate_info<size, false>* relinfo,
4075 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 4076 unsigned int r_type,
fc51264f 4077 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 4078 const Symbol* gsym,
4079 unsigned char* view,
fc51264f 4080 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 4081 section_size_type view_size)
4082{
fc51264f 4083 gold::apply_relocation<size, false, Target_x86_64<size>,
618d6666 4084 typename Target_x86_64<size>::Relocate>(
94a3fc8b
CC		 4085 relinfo,
4086 this,
4087 r_offset,
4088 r_type,
4089 r_addend,
4090 gsym,
4091 view,
4092 address,
4093 view_size);
4094}
4095
6a74a719
ILT		 4096// Return the size of a relocation while scanning during a relocatable
4097// link.
4098
fc51264f 4099template<int size>
6a74a719 4100unsigned int
fc51264f 4101Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc(
6a74a719
ILT		 4102 unsigned int r_type,
4103 Relobj* object)
4104{
4105 switch (r_type)
4106 {
4107 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 4108 case elfcpp::R_X86_64_GNU_VTINHERIT:
4109 case elfcpp::R_X86_64_GNU_VTENTRY:
6a74a719
ILT		 4110 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
4111 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
4112 case elfcpp::R_X86_64_TLSDESC_CALL:
4113 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
4114 case elfcpp::R_X86_64_DTPOFF32:
4115 case elfcpp::R_X86_64_DTPOFF64:
4116 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
4117 case elfcpp::R_X86_64_TPOFF32: // Local-exec
4118 return 0;
4119
4120 case elfcpp::R_X86_64_64:
4121 case elfcpp::R_X86_64_PC64:
4122 case elfcpp::R_X86_64_GOTOFF64:
4123 case elfcpp::R_X86_64_GOTPC64:
4124 case elfcpp::R_X86_64_PLTOFF64:
4125 case elfcpp::R_X86_64_GOT64:
4126 case elfcpp::R_X86_64_GOTPCREL64:
4127 case elfcpp::R_X86_64_GOTPCREL:
4128 case elfcpp::R_X86_64_GOTPLT64:
4129 return 8;
4130
4131 case elfcpp::R_X86_64_32:
4132 case elfcpp::R_X86_64_32S:
4133 case elfcpp::R_X86_64_PC32:
4134 case elfcpp::R_X86_64_PLT32:
4135 case elfcpp::R_X86_64_GOTPC32:
4136 case elfcpp::R_X86_64_GOT32:
4137 return 4;
4138
4139 case elfcpp::R_X86_64_16:
4140 case elfcpp::R_X86_64_PC16:
4141 return 2;
4142
4143 case elfcpp::R_X86_64_8:
4144 case elfcpp::R_X86_64_PC8:
4145 return 1;
4146
4147 case elfcpp::R_X86_64_COPY:
4148 case elfcpp::R_X86_64_GLOB_DAT:
4149 case elfcpp::R_X86_64_JUMP_SLOT:
4150 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 4151 case elfcpp::R_X86_64_IRELATIVE:
6a74a719
ILT		 4152 // These are outstanding tls relocs, which are unexpected when linking
4153 case elfcpp::R_X86_64_TPOFF64:
4154 case elfcpp::R_X86_64_DTPMOD64:
4155 case elfcpp::R_X86_64_TLSDESC:
4156 object->error(_("unexpected reloc %u in object file"), r_type);
4157 return 0;
4158
4159 case elfcpp::R_X86_64_SIZE32:
4160 case elfcpp::R_X86_64_SIZE64:
4161 default:
4162 object->error(_("unsupported reloc %u against local symbol"), r_type);
4163 return 0;
4164 }
4165}
4166
4167// Scan the relocs during a relocatable link.
4168
fc51264f 4169template<int size>
6a74a719 4170void
fc51264f
L		 4171Target_x86_64<size>::scan_relocatable_relocs(
4172 Symbol_table* symtab,
4173 Layout* layout,
4174 Sized_relobj_file<size, false>* object,
4175 unsigned int data_shndx,
4176 unsigned int sh_type,
4177 const unsigned char* prelocs,
4178 size_t reloc_count,
4179 Output_section* output_section,
4180 bool needs_special_offset_handling,
4181 size_t local_symbol_count,
4182 const unsigned char* plocal_symbols,
4183 Relocatable_relocs* rr)
6a74a719
ILT		 4184{
4185 gold_assert(sh_type == elfcpp::SHT_RELA);
4186
4187 typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
4188 Relocatable_size_for_reloc> Scan_relocatable_relocs;
4189
fc51264f 4190 gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA,
6a74a719 4191 Scan_relocatable_relocs>(
6a74a719
ILT		 4192 symtab,
4193 layout,
4194 object,
4195 data_shndx,
4196 prelocs,
4197 reloc_count,
4198 output_section,
4199 needs_special_offset_handling,
4200 local_symbol_count,
4201 plocal_symbols,
4202 rr);
4203}
4204
4205// Relocate a section during a relocatable link.
4206
fc51264f 4207template<int size>
6a74a719 4208void
fc51264f
L		 4209Target_x86_64<size>::relocate_for_relocatable(
4210 const Relocate_info<size, false>* relinfo,
6a74a719
ILT		 4211 unsigned int sh_type,
4212 const unsigned char* prelocs,
4213 size_t reloc_count,
4214 Output_section* output_section,
4215 off_t offset_in_output_section,
4216 const Relocatable_relocs* rr,
4217 unsigned char* view,
fc51264f 4218 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
6a74a719
ILT		 4219 section_size_type view_size,
4220 unsigned char* reloc_view,
4221 section_size_type reloc_view_size)
4222{
4223 gold_assert(sh_type == elfcpp::SHT_RELA);
4224
fc51264f 4225 gold::relocate_for_relocatable<size, false, elfcpp::SHT_RELA>(
6a74a719
ILT		 4226 relinfo,
4227 prelocs,
4228 reloc_count,
4229 output_section,
4230 offset_in_output_section,
4231 rr,
4232 view,
4233 view_address,
4234 view_size,
4235 reloc_view,
4236 reloc_view_size);
4237}
4238
4fb6c25d
ILT		 4239// Return the value to use for a dynamic which requires special
4240// treatment. This is how we support equality comparisons of function
4241// pointers across shared library boundaries, as described in the
4242// processor specific ABI supplement.
4243
fc51264f 4244template<int size>
4fb6c25d 4245uint64_t
fc51264f 4246Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4fb6c25d
ILT		 4247{
4248 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
67181c72 4249 return this->plt_address_for_global(gsym) + gsym->plt_offset();
4fb6c25d
ILT		 4250}
4251
2e30d253
ILT		 4252// Return a string used to fill a code section with nops to take up
4253// the specified length.
4254
fc51264f 4255template<int size>
2e30d253 4256std::string
fc51264f 4257Target_x86_64<size>::do_code_fill(section_size_type length) const
2e30d253
ILT		 4258{
4259 if (length >= 16)
4260 {
4261 // Build a jmpq instruction to skip over the bytes.
4262 unsigned char jmp[5];
4263 jmp[0] = 0xe9;
04bf7072 4264 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2e30d253 4265 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2e702c99 4266 + std::string(length - 5, static_cast<char>(0x90)));
2e30d253
ILT		 4267 }
4268
4269 // Nop sequences of various lengths.
76677ad0
CC		 4270 const char nop1[1] = { '\x90' }; // nop
4271 const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
4272 const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4273 const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
2e702c99 4274 '\x00'};
76677ad0
CC		 4275 const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
4276 '\x00', '\x00' };
4277 const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
2e702c99 4278 '\x44', '\x00', '\x00' };
76677ad0 4279 const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
2e702c99 4280 '\x00', '\x00', '\x00',
76677ad0
CC		 4281 '\x00' };
4282 const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
2e702c99 4283 '\x00', '\x00', '\x00',
76677ad0
CC		 4284 '\x00', '\x00' };
4285 const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
2e702c99 4286 '\x84', '\x00', '\x00',
76677ad0
CC		 4287 '\x00', '\x00', '\x00' };
4288 const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
2e702c99 4289 '\x1f', '\x84', '\x00',
76677ad0
CC		 4290 '\x00', '\x00', '\x00',
4291 '\x00' };
4292 const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
2e702c99 4293 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4294 '\x00', '\x00', '\x00',
4295 '\x00', '\x00' };
4296 const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
2e702c99 4297 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4298 '\x84', '\x00', '\x00',
4299 '\x00', '\x00', '\x00' };
4300 const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4301 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4302 '\x1f', '\x84', '\x00',
4303 '\x00', '\x00', '\x00',
2e702c99 4304 '\x00' };
76677ad0 4305 const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4306 '\x66', '\x66', '\x2e', // data16
76677ad0
CC		 4307 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4308 '\x00', '\x00', '\x00',
2e702c99 4309 '\x00', '\x00' };
76677ad0 4310 const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4311 '\x66', '\x66', '\x66', // data16; data16
76677ad0
CC		 4312 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4313 '\x84', '\x00', '\x00',
2e702c99 4314 '\x00', '\x00', '\x00' };
2e30d253
ILT		 4315
4316 const char* nops[16] = {
4317 NULL,
4318 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
4319 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
4320 };
4321
4322 return std::string(nops[length], length);
4323}
4324
e291e7b9
ILT		 4325// Return the addend to use for a target specific relocation. The
4326// only target specific relocation is R_X86_64_TLSDESC for a local
4327// symbol. We want to set the addend is the offset of the local
4328// symbol in the TLS segment.
4329
fc51264f 4330template<int size>
e291e7b9 4331uint64_t
fc51264f
L		 4332Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
4333 uint64_t) const
e291e7b9
ILT		 4334{
4335 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
4336 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
4337 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
4338 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
fc51264f 4339 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
e291e7b9
ILT		 4340 gold_assert(psymval->is_tls_symbol());
4341 // The value of a TLS symbol is the offset in the TLS segment.
4342 return psymval->value(ti.object, 0);
4343}
4344
02d7cd44
ILT		 4345// Return the value to use for the base of a DW_EH_PE_datarel offset
4346// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
4347// assembler can not write out the difference between two labels in
4348// different sections, so instead of using a pc-relative value they
4349// use an offset from the GOT.
4350
fc51264f 4351template<int size>
02d7cd44 4352uint64_t
fc51264f 4353Target_x86_64<size>::do_ehframe_datarel_base() const
02d7cd44
ILT		 4354{
4355 gold_assert(this->global_offset_table_ != NULL);
4356 Symbol* sym = this->global_offset_table_;
fc51264f 4357 Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
02d7cd44
ILT		 4358 return ssym->value();
4359}
4360
364c7fa5 4361// FNOFFSET in section SHNDX in OBJECT is the start of a function
9b547ce6 4362// compiled with -fsplit-stack. The function calls non-split-stack
364c7fa5
ILT		 4363// code. We have to change the function so that it always ensures
4364// that it has enough stack space to run some random function.
4365
fc51264f 4366template<int size>
364c7fa5 4367void
fc51264f
L		 4368Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
4369 section_offset_type fnoffset,
4370 section_size_type fnsize,
4371 unsigned char* view,
4372 section_size_type view_size,
4373 std::string* from,
4374 std::string* to) const
364c7fa5
ILT		 4375{
4376 // The function starts with a comparison of the stack pointer and a
4377 // field in the TCB. This is followed by a jump.
4378
4379 // cmp %fs:NN,%rsp
4380 if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5)
4381 && fnsize > 9)
4382 {
4383 // We will call __morestack if the carry flag is set after this
4384 // comparison. We turn the comparison into an stc instruction
4385 // and some nops.
4386 view[fnoffset] = '\xf9';
4387 this->set_view_to_nop(view, view_size, fnoffset + 1, 8);
4388 }
4389 // lea NN(%rsp),%r10
cbc999b9
ILT		 4390 // lea NN(%rsp),%r11
4391 else if ((this->match_view(view, view_size, fnoffset,
4392 "\x4c\x8d\x94\x24", 4)
4393 || this->match_view(view, view_size, fnoffset,
4394 "\x4c\x8d\x9c\x24", 4))
364c7fa5
ILT		 4395 && fnsize > 8)
4396 {
4397 // This is loading an offset from the stack pointer for a
4398 // comparison. The offset is negative, so we decrease the
4399 // offset by the amount of space we need for the stack. This
4400 // means we will avoid calling __morestack if there happens to
4401 // be plenty of space on the stack already.
4402 unsigned char* pval = view + fnoffset + 4;
4403 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
4404 val -= parameters->options().split_stack_adjust_size();
4405 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
4406 }
4407 else
4408 {
4409 if (!object->has_no_split_stack())
4410 object->error(_("failed to match split-stack sequence at "
4411 "section %u offset %0zx"),
ac33a407 4412 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 4413 return;
4414 }
4415
4416 // We have to change the function so that it calls
4417 // __morestack_non_split instead of __morestack. The former will
4418 // allocate additional stack space.
4419 *from = "__morestack";
4420 *to = "__morestack_non_split";
4421}
4422
2e702c99
RM		 4423// The selector for x86_64 object files. Note this is never instantiated
4424// directly. It's only used in Target_selector_x86_64_nacl, below.
2e30d253 4425
fc51264f 4426template<int size>
36959681 4427class Target_selector_x86_64 : public Target_selector_freebsd
2e30d253
ILT		 4428{
4429public:
4430 Target_selector_x86_64()
fc51264f 4431 : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
2e702c99 4432 (size == 64
fc51264f 4433 ? "elf64-x86-64" : "elf32-x86-64"),
2e702c99 4434 (size == 64
fc51264f
L		 4435 ? "elf64-x86-64-freebsd"
4436 : "elf32-x86-64-freebsd"),
4437 (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
2e30d253
ILT		 4438 { }
4439
4440 Target*
e96caa79 4441 do_instantiate_target()
fc51264f 4442 { return new Target_x86_64<size>(); }
36959681 4443
2e30d253
ILT		 4444};
4445
2e702c99
RM		 4446// NaCl variant. It uses different PLT contents.
4447
4448template<int size>
4449class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
4450{
4451 public:
4452 Output_data_plt_x86_64_nacl(Layout* layout,
4453 Output_data_got<64, false>* got,
4454 Output_data_space* got_plt,
4455 Output_data_space* got_irelative)
4456 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4457 got, got_plt, got_irelative)
4458 { }
4459
4460 Output_data_plt_x86_64_nacl(Layout* layout,
4461 Output_data_got<64, false>* got,
4462 Output_data_space* got_plt,
4463 Output_data_space* got_irelative,
4464 unsigned int plt_count)
4465 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4466 got, got_plt, got_irelative,
4467 plt_count)
4468 { }
4469
4470 protected:
4471 virtual unsigned int
4472 do_get_plt_entry_size() const
4473 { return plt_entry_size; }
4474
4475 virtual void
4476 do_add_eh_frame(Layout* layout)
4477 {
4478 layout->add_eh_frame_for_plt(this,
4479 this->plt_eh_frame_cie,
4480 this->plt_eh_frame_cie_size,
4481 plt_eh_frame_fde,
4482 plt_eh_frame_fde_size);
4483 }
4484
4485 virtual void
4486 do_fill_first_plt_entry(unsigned char* pov,
4487 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
4488 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
4489
4490 virtual unsigned int
4491 do_fill_plt_entry(unsigned char* pov,
4492 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4493 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4494 unsigned int got_offset,
4495 unsigned int plt_offset,
4496 unsigned int plt_index);
4497
4498 virtual void
4499 do_fill_tlsdesc_entry(unsigned char* pov,
4500 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4501 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4502 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4503 unsigned int tlsdesc_got_offset,
4504 unsigned int plt_offset);
4505
4506 private:
4507 // The size of an entry in the PLT.
4508 static const int plt_entry_size = 64;
4509
4510 // The first entry in the PLT.
4511 static const unsigned char first_plt_entry[plt_entry_size];
4512
4513 // Other entries in the PLT for an executable.
4514 static const unsigned char plt_entry[plt_entry_size];
4515
4516 // The reserved TLSDESC entry in the PLT for an executable.
4517 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
4518
4519 // The .eh_frame unwind information for the PLT.
4520 static const int plt_eh_frame_fde_size = 32;
4521 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
4522};
4523
4524template<int size>
4525class Target_x86_64_nacl : public Target_x86_64<size>
4526{
4527 public:
4528 Target_x86_64_nacl()
4529 : Target_x86_64<size>(&x86_64_nacl_info)
4530 { }
4531
4532 virtual Output_data_plt_x86_64<size>*
4533 do_make_data_plt(Layout* layout,
4534 Output_data_got<64, false>* got,
4535 Output_data_space* got_plt,
4536 Output_data_space* got_irelative)
4537 {
4538 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4539 got_irelative);
4540 }
4541
4542 virtual Output_data_plt_x86_64<size>*
4543 do_make_data_plt(Layout* layout,
4544 Output_data_got<64, false>* got,
4545 Output_data_space* got_plt,
4546 Output_data_space* got_irelative,
4547 unsigned int plt_count)
4548 {
4549 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4550 got_irelative,
4551 plt_count);
4552 }
4553
4554 private:
4555 static const Target::Target_info x86_64_nacl_info;
4556};
4557
4558template<>
4559const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
4560{
4561 64, // size
4562 false, // is_big_endian
4563 elfcpp::EM_X86_64, // machine_code
4564 false, // has_make_symbol
4565 false, // has_resolve
4566 true, // has_code_fill
4567 true, // is_default_stack_executable
4568 true, // can_icf_inline_merge_sections
4569 '\0', // wrap_char
4570 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
4571 0x20000, // default_text_segment_address
4572 0x10000, // abi_pagesize (overridable by -z max-page-size)
4573 0x10000, // common_pagesize (overridable by -z common-page-size)
4574 true, // isolate_execinstr
4575 0x10000000, // rosegment_gap
4576 elfcpp::SHN_UNDEF, // small_common_shndx
4577 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
4578 0, // small_common_section_flags
4579 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
4580 NULL, // attributes_section
4581 NULL // attributes_vendor
4582};
4583
4584template<>
4585const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
4586{
4587 32, // size
4588 false, // is_big_endian
4589 elfcpp::EM_X86_64, // machine_code
4590 false, // has_make_symbol
4591 false, // has_resolve
4592 true, // has_code_fill
4593 true, // is_default_stack_executable
4594 true, // can_icf_inline_merge_sections
4595 '\0', // wrap_char
4596 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
4597 0x20000, // default_text_segment_address
4598 0x10000, // abi_pagesize (overridable by -z max-page-size)
4599 0x10000, // common_pagesize (overridable by -z common-page-size)
4600 true, // isolate_execinstr
4601 0x10000000, // rosegment_gap
4602 elfcpp::SHN_UNDEF, // small_common_shndx
4603 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
4604 0, // small_common_section_flags
4605 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
4606 NULL, // attributes_section
4607 NULL // attributes_vendor
4608};
4609
4610#define NACLMASK 0xe0 // 32-byte alignment mask.
4611
4612// The first entry in the PLT.
4613
4614template<int size>
4615const unsigned char
4616Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
4617{
4618 0xff, 0x35, // pushq contents of memory address
4619 0, 0, 0, 0, // replaced with address of .got + 8
4620 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
4621 0, 0, 0, 0, // replaced with address of .got + 16
4622 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4623 0x4d, 0x01, 0xfb, // add %r15, %r11
4624 0x41, 0xff, 0xe3, // jmpq *%r11
4625
4626 // 9-byte nop sequence to pad out to the next 32-byte boundary.
4627 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopl %cs:0x0(%rax,%rax,1)
4628
4629 // 32 bytes of nop to pad out to the standard size
4630 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4631 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4632 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4633 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4634 0x66, // excess data32 prefix
4635 0x90 // nop
4636};
4637
4638template<int size>
4639void
4640Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
4641 unsigned char* pov,
4642 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4643 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
4644{
4645 memcpy(pov, first_plt_entry, plt_entry_size);
4646 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4647 (got_address + 8
4648 - (plt_address + 2 + 4)));
4649 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4650 (got_address + 16
4651 - (plt_address + 9 + 4)));
4652}
4653
4654// Subsequent entries in the PLT.
4655
4656template<int size>
4657const unsigned char
4658Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
4659{
4660 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
4661 0, 0, 0, 0, // replaced with address of symbol in .got
4662 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4663 0x4d, 0x01, 0xfb, // add %r15, %r11
4664 0x41, 0xff, 0xe3, // jmpq *%r11
4665
4666 // 15-byte nop sequence to pad out to the next 32-byte boundary.
4667 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4668 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4669
4670 // Lazy GOT entries point here (32-byte aligned).
4671 0x68, // pushq immediate
4672 0, 0, 0, 0, // replaced with index into relocation table
4673 0xe9, // jmp relative
4674 0, 0, 0, 0, // replaced with offset to start of .plt0
4675
4676 // 22 bytes of nop to pad out to the standard size.
4677 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4678 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4679 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
4680};
4681
4682template<int size>
4683unsigned int
4684Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
4685 unsigned char* pov,
4686 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4687 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4688 unsigned int got_offset,
4689 unsigned int plt_offset,
4690 unsigned int plt_index)
4691{
4692 memcpy(pov, plt_entry, plt_entry_size);
4693 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
4694 (got_address + got_offset
4695 - (plt_address + plt_offset
4696 + 3 + 4)));
4697
4698 elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
4699 elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
4700 - (plt_offset + 38 + 4));
4701
4702 return 32;
4703}
4704
4705// The reserved TLSDESC entry in the PLT.
4706
4707template<int size>
4708const unsigned char
4709Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
4710{
4711 0xff, 0x35, // pushq x(%rip)
4712 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
4713 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
4714 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
4715 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4716 0x4d, 0x01, 0xfb, // add %r15, %r11
4717 0x41, 0xff, 0xe3, // jmpq *%r11
4718
4719 // 41 bytes of nop to pad out to the standard size.
4720 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4721 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4722 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4723 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4724 0x66, 0x66, // excess data32 prefixes
4725 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4726};
4727
4728template<int size>
4729void
4730Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
4731 unsigned char* pov,
4732 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4733 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4734 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4735 unsigned int tlsdesc_got_offset,
4736 unsigned int plt_offset)
4737{
4738 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
4739 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4740 (got_address + 8
4741 - (plt_address + plt_offset
4742 + 2 + 4)));
4743 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4744 (got_base
4745 + tlsdesc_got_offset
4746 - (plt_address + plt_offset
4747 + 9 + 4)));
4748}
4749
4750// The .eh_frame unwind information for the PLT.
4751
4752template<int size>
4753const unsigned char
4754Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
4755{
4756 0, 0, 0, 0, // Replaced with offset to .plt.
4757 0, 0, 0, 0, // Replaced with size of .plt.
4758 0, // Augmentation size.
4759 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
4760 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
4761 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
4762 elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
4763 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
4764 13, // Block length.
4765 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
4766 elfcpp::DW_OP_breg16, 0, // Push %rip.
4767 elfcpp::DW_OP_const1u, 63, // Push 0x3f.
4768 elfcpp::DW_OP_and, // & (%rip & 0x3f).
4769 elfcpp::DW_OP_const1u, 37, // Push 0x25.
4770 elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
4771 elfcpp::DW_OP_lit3, // Push 3.
4772 elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
4773 elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
4774 elfcpp::DW_CFA_nop, // Align to 32 bytes.
4775 elfcpp::DW_CFA_nop
4776};
4777
4778// The selector for x86_64-nacl object files.
4779
4780template<int size>
4781class Target_selector_x86_64_nacl
4782 : public Target_selector_nacl<Target_selector_x86_64<size>,
4783 Target_x86_64_nacl<size> >
4784{
4785 public:
4786 Target_selector_x86_64_nacl()
4787 : Target_selector_nacl<Target_selector_x86_64<size>,
4788 Target_x86_64_nacl<size> >("x86-64",
4789 size == 64
4790 ? "elf64-x86-64-nacl"
4791 : "elf32-x86-64-nacl",
4792 size == 64
4793 ? "elf_x86_64_nacl"
4794 : "elf32_x86_64_nacl")
4795 { }
4796};
4797
4798Target_selector_x86_64_nacl<64> target_selector_x86_64;
4799Target_selector_x86_64_nacl<32> target_selector_x32;
2e30d253
ILT		 4800
4801} // End anonymous namespace.
GDB Binutils - Deliverables
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