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varobj: Cleanup dead code
[deliverable/binutils-gdb.git] / gold / x86_64.cc
CommitLineData
2e30d253
ILT		 1// x86_64.cc -- x86_64 target support for gold.
2
6f2750fe 3// Copyright (C) 2006-2016 Free Software Foundation, Inc.
2e30d253
ILT		 4// Written by Ian Lance Taylor <iant@google.com>.
5
6// This file is part of gold.
7
8b105e34
ILT		 8// This program is free software; you can redistribute it and/or modify
9// it under the terms of the GNU General Public License as published by
10// the Free Software Foundation; either version 3 of the License, or
2e30d253
ILT		 11// (at your option) any later version.
12
8b105e34
ILT		 13// This program is distributed in the hope that it will be useful,
14// but WITHOUT ANY WARRANTY; without even the implied warranty of
15// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16// GNU General Public License for more details.
17
18// You should have received a copy of the GNU General Public License
19// along with this program; if not, write to the Free Software
20// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21// MA 02110-1301, USA.
2e30d253
ILT		 22
23#include "gold.h"
24
25#include <cstring>
26
27#include "elfcpp.h"
07a60597 28#include "dwarf.h"
2e30d253
ILT		 29#include "parameters.h"
30#include "reloc.h"
31#include "x86_64.h"
32#include "object.h"
33#include "symtab.h"
34#include "layout.h"
35#include "output.h"
12c0daef 36#include "copy-relocs.h"
2e30d253
ILT		 37#include "target.h"
38#include "target-reloc.h"
39#include "target-select.h"
e041f13d 40#include "tls.h"
36959681 41#include "freebsd.h"
2e702c99 42#include "nacl.h"
f345227a 43#include "gc.h"
21bb3914 44#include "icf.h"
2e30d253
ILT		 45
46namespace
47{
48
49using namespace gold;
50
57b2284c
CC		 51// A class to handle the .got.plt section.
52
53class Output_data_got_plt_x86_64 : public Output_section_data_build
54{
55 public:
56 Output_data_got_plt_x86_64(Layout* layout)
57 : Output_section_data_build(8),
58 layout_(layout)
59 { }
60
61 Output_data_got_plt_x86_64(Layout* layout, off_t data_size)
62 : Output_section_data_build(data_size, 8),
63 layout_(layout)
64 { }
65
66 protected:
67 // Write out the PLT data.
68 void
69 do_write(Output_file*);
70
71 // Write to a map file.
72 void
73 do_print_to_mapfile(Mapfile* mapfile) const
74 { mapfile->print_output_data(this, "** GOT PLT"); }
75
76 private:
77 // A pointer to the Layout class, so that we can find the .dynamic
78 // section when we write out the GOT PLT section.
79 Layout* layout_;
80};
81
7223e9ca 82// A class to handle the PLT data.
2e702c99
RM		 83// This is an abstract base class that handles most of the linker details
84// but does not know the actual contents of PLT entries. The derived
85// classes below fill in those details.
7223e9ca 86
fc51264f 87template<int size>
7223e9ca
ILT		 88class Output_data_plt_x86_64 : public Output_section_data
89{
90 public:
fc51264f 91 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
7223e9ca 92
2e702c99
RM		 93 Output_data_plt_x86_64(Layout* layout, uint64_t addralign,
94 Output_data_got<64, false>* got,
57b2284c 95 Output_data_got_plt_x86_64* got_plt,
67181c72 96 Output_data_space* got_irelative)
57b2284c 97 : Output_section_data(addralign), tlsdesc_rel_(NULL),
7d172687
ILT		 98 irelative_rel_(NULL), got_(got), got_plt_(got_plt),
99 got_irelative_(got_irelative), count_(0), irelative_count_(0),
100 tlsdesc_got_offset_(-1U), free_list_()
67181c72
ILT		 101 { this->init(layout); }
102
2e702c99
RM		 103 Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size,
104 Output_data_got<64, false>* got,
57b2284c 105 Output_data_got_plt_x86_64* got_plt,
67181c72 106 Output_data_space* got_irelative,
4829d394 107 unsigned int plt_count)
2e702c99
RM		 108 : Output_section_data((plt_count + 1) * plt_entry_size,
109 plt_entry_size, false),
57b2284c 110 tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got),
7d172687
ILT		 111 got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count),
112 irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_()
4829d394 113 {
67181c72 114 this->init(layout);
4829d394
CC		 115
116 // Initialize the free list and reserve the first entry.
117 this->free_list_.init((plt_count + 1) * plt_entry_size, false);
118 this->free_list_.remove(0, plt_entry_size);
119 }
120
121 // Initialize the PLT section.
122 void
67181c72 123 init(Layout* layout);
7223e9ca
ILT		 124
125 // Add an entry to the PLT.
126 void
67181c72 127 add_entry(Symbol_table*, Layout*, Symbol* gsym);
7223e9ca
ILT		 128
129 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
130 unsigned int
67181c72 131 add_local_ifunc_entry(Symbol_table* symtab, Layout*,
fc51264f 132 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 133 unsigned int local_sym_index);
134
4829d394
CC		 135 // Add the relocation for a PLT entry.
136 void
67181c72
ILT		 137 add_relocation(Symbol_table*, Layout*, Symbol* gsym,
138 unsigned int got_offset);
4829d394 139
7223e9ca
ILT		 140 // Add the reserved TLSDESC_PLT entry to the PLT.
141 void
142 reserve_tlsdesc_entry(unsigned int got_offset)
143 { this->tlsdesc_got_offset_ = got_offset; }
144
145 // Return true if a TLSDESC_PLT entry has been reserved.
146 bool
147 has_tlsdesc_entry() const
148 { return this->tlsdesc_got_offset_ != -1U; }
149
150 // Return the GOT offset for the reserved TLSDESC_PLT entry.
151 unsigned int
152 get_tlsdesc_got_offset() const
153 { return this->tlsdesc_got_offset_; }
154
155 // Return the offset of the reserved TLSDESC_PLT entry.
156 unsigned int
157 get_tlsdesc_plt_offset() const
2e702c99
RM		 158 {
159 return ((this->count_ + this->irelative_count_ + 1)
160 * this->get_plt_entry_size());
161 }
7223e9ca
ILT		 162
163 // Return the .rela.plt section data.
164 Reloc_section*
165 rela_plt()
166 { return this->rel_; }
167
168 // Return where the TLSDESC relocations should go.
169 Reloc_section*
170 rela_tlsdesc(Layout*);
171
67181c72
ILT		 172 // Return where the IRELATIVE relocations should go in the PLT
173 // relocations.
174 Reloc_section*
175 rela_irelative(Symbol_table*, Layout*);
176
177 // Return whether we created a section for IRELATIVE relocations.
178 bool
179 has_irelative_section() const
180 { return this->irelative_rel_ != NULL; }
181
7223e9ca
ILT		 182 // Return the number of PLT entries.
183 unsigned int
184 entry_count() const
67181c72 185 { return this->count_ + this->irelative_count_; }
7223e9ca
ILT		 186
187 // Return the offset of the first non-reserved PLT entry.
2e702c99 188 unsigned int
7223e9ca 189 first_plt_entry_offset()
2e702c99 190 { return this->get_plt_entry_size(); }
7223e9ca
ILT		 191
192 // Return the size of a PLT entry.
2e702c99
RM		 193 unsigned int
194 get_plt_entry_size() const
195 { return this->do_get_plt_entry_size(); }
7223e9ca 196
4829d394
CC		 197 // Reserve a slot in the PLT for an existing symbol in an incremental update.
198 void
199 reserve_slot(unsigned int plt_index)
200 {
2e702c99
RM		 201 this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(),
202 (plt_index + 2) * this->get_plt_entry_size());
4829d394
CC		 203 }
204
67181c72
ILT		 205 // Return the PLT address to use for a global symbol.
206 uint64_t
207 address_for_global(const Symbol*);
208
209 // Return the PLT address to use for a local symbol.
210 uint64_t
211 address_for_local(const Relobj*, unsigned int symndx);
212
2e702c99
RM		 213 // Add .eh_frame information for the PLT.
214 void
215 add_eh_frame(Layout* layout)
216 { this->do_add_eh_frame(layout); }
217
7223e9ca 218 protected:
2e702c99
RM		 219 // Fill in the first PLT entry.
220 void
221 fill_first_plt_entry(unsigned char* pov,
222 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
223 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
224 { this->do_fill_first_plt_entry(pov, got_address, plt_address); }
225
226 // Fill in a normal PLT entry. Returns the offset into the entry that
227 // should be the initial GOT slot value.
228 unsigned int
229 fill_plt_entry(unsigned char* pov,
230 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
231 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
232 unsigned int got_offset,
233 unsigned int plt_offset,
234 unsigned int plt_index)
235 {
236 return this->do_fill_plt_entry(pov, got_address, plt_address,
237 got_offset, plt_offset, plt_index);
238 }
239
240 // Fill in the reserved TLSDESC PLT entry.
241 void
242 fill_tlsdesc_entry(unsigned char* pov,
243 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
244 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
245 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
246 unsigned int tlsdesc_got_offset,
247 unsigned int plt_offset)
248 {
249 this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
250 tlsdesc_got_offset, plt_offset);
251 }
252
253 virtual unsigned int
254 do_get_plt_entry_size() const = 0;
255
256 virtual void
257 do_fill_first_plt_entry(unsigned char* pov,
258 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
259 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr)
260 = 0;
261
262 virtual unsigned int
263 do_fill_plt_entry(unsigned char* pov,
264 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
265 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
266 unsigned int got_offset,
267 unsigned int plt_offset,
268 unsigned int plt_index) = 0;
269
270 virtual void
271 do_fill_tlsdesc_entry(unsigned char* pov,
272 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
273 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
274 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
275 unsigned int tlsdesc_got_offset,
276 unsigned int plt_offset) = 0;
277
278 virtual void
279 do_add_eh_frame(Layout* layout) = 0;
280
7223e9ca
ILT		 281 void
282 do_adjust_output_section(Output_section* os);
283
284 // Write to a map file.
285 void
286 do_print_to_mapfile(Mapfile* mapfile) const
287 { mapfile->print_output_data(this, _("** PLT")); }
288
2e702c99 289 // The CIE of the .eh_frame unwind information for the PLT.
07a60597 290 static const int plt_eh_frame_cie_size = 16;
07a60597 291 static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
7223e9ca 292
2e702c99 293 private:
7223e9ca
ILT		 294 // Set the final size.
295 void
296 set_final_data_size();
297
298 // Write out the PLT data.
299 void
300 do_write(Output_file*);
301
302 // The reloc section.
303 Reloc_section* rel_;
304 // The TLSDESC relocs, if necessary. These must follow the regular
305 // PLT relocs.
306 Reloc_section* tlsdesc_rel_;
67181c72
ILT		 307 // The IRELATIVE relocs, if necessary. These must follow the
308 // regular PLT relocations and the TLSDESC relocations.
309 Reloc_section* irelative_rel_;
7223e9ca
ILT		 310 // The .got section.
311 Output_data_got<64, false>* got_;
312 // The .got.plt section.
57b2284c 313 Output_data_got_plt_x86_64* got_plt_;
67181c72
ILT		 314 // The part of the .got.plt section used for IRELATIVE relocs.
315 Output_data_space* got_irelative_;
7223e9ca
ILT		 316 // The number of PLT entries.
317 unsigned int count_;
67181c72
ILT		 318 // Number of PLT entries with R_X86_64_IRELATIVE relocs. These
319 // follow the regular PLT entries.
320 unsigned int irelative_count_;
7223e9ca
ILT		 321 // Offset of the reserved TLSDESC_GOT entry when needed.
322 unsigned int tlsdesc_got_offset_;
4829d394
CC		 323 // List of available regions within the section, for incremental
324 // update links.
325 Free_list free_list_;
7223e9ca 326};
2e30d253 327
2e702c99
RM		 328template<int size>
329class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size>
330{
331 public:
332 Output_data_plt_x86_64_standard(Layout* layout,
333 Output_data_got<64, false>* got,
57b2284c 334 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 335 Output_data_space* got_irelative)
336 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
337 got, got_plt, got_irelative)
338 { }
339
340 Output_data_plt_x86_64_standard(Layout* layout,
341 Output_data_got<64, false>* got,
57b2284c 342 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 343 Output_data_space* got_irelative,
344 unsigned int plt_count)
345 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
346 got, got_plt, got_irelative,
347 plt_count)
348 { }
349
350 protected:
351 virtual unsigned int
352 do_get_plt_entry_size() const
353 { return plt_entry_size; }
354
355 virtual void
356 do_add_eh_frame(Layout* layout)
357 {
358 layout->add_eh_frame_for_plt(this,
359 this->plt_eh_frame_cie,
360 this->plt_eh_frame_cie_size,
361 plt_eh_frame_fde,
362 plt_eh_frame_fde_size);
363 }
364
365 virtual void
366 do_fill_first_plt_entry(unsigned char* pov,
367 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
368 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
369
370 virtual unsigned int
371 do_fill_plt_entry(unsigned char* pov,
372 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
373 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
374 unsigned int got_offset,
375 unsigned int plt_offset,
376 unsigned int plt_index);
377
378 virtual void
379 do_fill_tlsdesc_entry(unsigned char* pov,
380 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
381 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
382 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
383 unsigned int tlsdesc_got_offset,
384 unsigned int plt_offset);
385
386 private:
387 // The size of an entry in the PLT.
388 static const int plt_entry_size = 16;
389
390 // The first entry in the PLT.
391 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
392 // procedure linkage table for both programs and shared objects."
393 static const unsigned char first_plt_entry[plt_entry_size];
394
395 // Other entries in the PLT for an executable.
396 static const unsigned char plt_entry[plt_entry_size];
397
398 // The reserved TLSDESC entry in the PLT for an executable.
399 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
400
401 // The .eh_frame unwind information for the PLT.
402 static const int plt_eh_frame_fde_size = 32;
403 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
404};
405
2e30d253 406// The x86_64 target class.
d61c17ea
ILT		 407// See the ABI at
408// http://www.x86-64.org/documentation/abi.pdf
409// TLS info comes from
410// http://people.redhat.com/drepper/tls.pdf
0ffd9845 411// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
2e30d253 412
fc51264f
L		 413template<int size>
414class Target_x86_64 : public Sized_target<size, false>
2e30d253
ILT		 415{
416 public:
e822f2b1
ILT		 417 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
418 // uses only Elf64_Rela relocation entries with explicit addends."
fc51264f 419 typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section;
2e30d253 420
2e702c99
RM		 421 Target_x86_64(const Target::Target_info* info = &x86_64_info)
422 : Sized_target<size, false>(info),
67181c72
ILT		 423 got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL),
424 got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL),
425 rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY),
43819297 426 got_mod_index_offset_(-1U), tlsdesc_reloc_info_(),
e291e7b9 427 tls_base_symbol_defined_(false)
2e30d253
ILT		 428 { }
429
8a5e3e08
ILT		 430 // Hook for a new output section.
431 void
432 do_new_output_section(Output_section*) const;
433
6d03d481
ST		 434 // Scan the relocations to look for symbol adjustments.
435 void
ad0f2072 436 gc_process_relocs(Symbol_table* symtab,
2e702c99
RM		 437 Layout* layout,
438 Sized_relobj_file<size, false>* object,
439 unsigned int data_shndx,
440 unsigned int sh_type,
441 const unsigned char* prelocs,
442 size_t reloc_count,
443 Output_section* output_section,
444 bool needs_special_offset_handling,
445 size_t local_symbol_count,
446 const unsigned char* plocal_symbols);
6d03d481 447
2e30d253
ILT		 448 // Scan the relocations to look for symbol adjustments.
449 void
ad0f2072 450 scan_relocs(Symbol_table* symtab,
2e30d253 451 Layout* layout,
fc51264f 452 Sized_relobj_file<size, false>* object,
2e30d253
ILT		 453 unsigned int data_shndx,
454 unsigned int sh_type,
455 const unsigned char* prelocs,
456 size_t reloc_count,
730cdc88
ILT		 457 Output_section* output_section,
458 bool needs_special_offset_handling,
2e30d253 459 size_t local_symbol_count,
730cdc88 460 const unsigned char* plocal_symbols);
2e30d253
ILT		 461
462 // Finalize the sections.
463 void
f59f41f3 464 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2e30d253 465
4fb6c25d
ILT		 466 // Return the value to use for a dynamic which requires special
467 // treatment.
468 uint64_t
469 do_dynsym_value(const Symbol*) const;
470
2e30d253
ILT		 471 // Relocate a section.
472 void
fc51264f 473 relocate_section(const Relocate_info<size, false>*,
2e30d253
ILT		 474 unsigned int sh_type,
475 const unsigned char* prelocs,
476 size_t reloc_count,
730cdc88
ILT		 477 Output_section* output_section,
478 bool needs_special_offset_handling,
2e30d253 479 unsigned char* view,
fc51264f 480 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
364c7fa5
ILT		 481 section_size_type view_size,
482 const Reloc_symbol_changes*);
2e30d253 483
6a74a719
ILT		 484 // Scan the relocs during a relocatable link.
485 void
ad0f2072 486 scan_relocatable_relocs(Symbol_table* symtab,
6a74a719 487 Layout* layout,
fc51264f 488 Sized_relobj_file<size, false>* object,
6a74a719
ILT		 489 unsigned int data_shndx,
490 unsigned int sh_type,
491 const unsigned char* prelocs,
492 size_t reloc_count,
493 Output_section* output_section,
494 bool needs_special_offset_handling,
495 size_t local_symbol_count,
496 const unsigned char* plocal_symbols,
497 Relocatable_relocs*);
498
4d625b70
CC		 499 // Scan the relocs for --emit-relocs.
500 void
501 emit_relocs_scan(Symbol_table* symtab,
502 Layout* layout,
503 Sized_relobj_file<size, false>* object,
504 unsigned int data_shndx,
505 unsigned int sh_type,
506 const unsigned char* prelocs,
507 size_t reloc_count,
508 Output_section* output_section,
509 bool needs_special_offset_handling,
510 size_t local_symbol_count,
511 const unsigned char* plocal_syms,
512 Relocatable_relocs* rr);
513
7404fe1b 514 // Emit relocations for a section.
6a74a719 515 void
7404fe1b 516 relocate_relocs(
fc51264f
L		 517 const Relocate_info<size, false>*,
518 unsigned int sh_type,
519 const unsigned char* prelocs,
520 size_t reloc_count,
521 Output_section* output_section,
62fe925a 522 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
fc51264f
L		 523 unsigned char* view,
524 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
525 section_size_type view_size,
526 unsigned char* reloc_view,
527 section_size_type reloc_view_size);
6a74a719 528
2e30d253
ILT		 529 // Return a string used to fill a code section with nops.
530 std::string
8851ecca 531 do_code_fill(section_size_type length) const;
2e30d253 532
9a2d6984
ILT		 533 // Return whether SYM is defined by the ABI.
534 bool
9c2d0ef9 535 do_is_defined_by_abi(const Symbol* sym) const
9a2d6984
ILT		 536 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
537
e291e7b9
ILT		 538 // Return the symbol index to use for a target specific relocation.
539 // The only target specific relocation is R_X86_64_TLSDESC for a
540 // local symbol, which is an absolute reloc.
541 unsigned int
542 do_reloc_symbol_index(void*, unsigned int r_type) const
543 {
544 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
545 return 0;
546 }
547
548 // Return the addend to use for a target specific relocation.
549 uint64_t
550 do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const;
551
7223e9ca 552 // Return the PLT section.
67181c72
ILT		 553 uint64_t
554 do_plt_address_for_global(const Symbol* gsym) const
555 { return this->plt_section()->address_for_global(gsym); }
7223e9ca 556
67181c72
ILT		 557 uint64_t
558 do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const
559 { return this->plt_section()->address_for_local(relobj, symndx); }
7223e9ca 560
b3ce541e
ILT		 561 // This function should be defined in targets that can use relocation
562 // types to determine (implemented in local_reloc_may_be_function_pointer
563 // and global_reloc_may_be_function_pointer)
564 // if a function's pointer is taken. ICF uses this in safe mode to only
565 // fold those functions whose pointer is defintely not taken. For x86_64
566 // pie binaries, safe ICF cannot be done by looking at relocation types.
567 bool
568 do_can_check_for_function_pointers() const
569 { return !parameters->options().pie(); }
570
02d7cd44
ILT		 571 // Return the base for a DW_EH_PE_datarel encoding.
572 uint64_t
573 do_ehframe_datarel_base() const;
574
9b547ce6 575 // Adjust -fsplit-stack code which calls non-split-stack code.
364c7fa5
ILT		 576 void
577 do_calls_non_split(Relobj* object, unsigned int shndx,
578 section_offset_type fnoffset, section_size_type fnsize,
6e0813d3 579 const unsigned char* prelocs, size_t reloc_count,
364c7fa5
ILT		 580 unsigned char* view, section_size_type view_size,
581 std::string* from, std::string* to) const;
582
96f2030e 583 // Return the size of the GOT section.
fe8718a4 584 section_size_type
0e70b911 585 got_size() const
96f2030e
ILT		 586 {
587 gold_assert(this->got_ != NULL);
588 return this->got_->data_size();
589 }
590
0e70b911
CC		 591 // Return the number of entries in the GOT.
592 unsigned int
593 got_entry_count() const
594 {
595 if (this->got_ == NULL)
596 return 0;
597 return this->got_size() / 8;
598 }
599
600 // Return the number of entries in the PLT.
601 unsigned int
602 plt_entry_count() const;
603
604 // Return the offset of the first non-reserved PLT entry.
605 unsigned int
606 first_plt_entry_offset() const;
607
608 // Return the size of each PLT entry.
609 unsigned int
610 plt_entry_size() const;
611
41e83f2b
L		 612 // Return the size of each GOT entry.
613 unsigned int
614 got_entry_size() const
615 { return 8; };
616
4829d394 617 // Create the GOT section for an incremental update.
dd74ae06 618 Output_data_got_base*
4829d394
CC		 619 init_got_plt_for_update(Symbol_table* symtab,
620 Layout* layout,
621 unsigned int got_count,
622 unsigned int plt_count);
623
6fa2a40b
CC		 624 // Reserve a GOT entry for a local symbol, and regenerate any
625 // necessary dynamic relocations.
626 void
627 reserve_local_got_entry(unsigned int got_index,
2e702c99 628 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 629 unsigned int r_sym,
630 unsigned int got_type);
631
632 // Reserve a GOT entry for a global symbol, and regenerate any
633 // necessary dynamic relocations.
634 void
635 reserve_global_got_entry(unsigned int got_index, Symbol* gsym,
636 unsigned int got_type);
637
4829d394 638 // Register an existing PLT entry for a global symbol.
4829d394 639 void
67181c72
ILT		 640 register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index,
641 Symbol* gsym);
4829d394 642
26d3c67d
CC		 643 // Force a COPY relocation for a given symbol.
644 void
645 emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t);
646
94a3fc8b
CC		 647 // Apply an incremental relocation.
648 void
fc51264f
L		 649 apply_relocation(const Relocate_info<size, false>* relinfo,
650 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 651 unsigned int r_type,
fc51264f 652 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 653 const Symbol* gsym,
654 unsigned char* view,
fc51264f 655 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 656 section_size_type view_size);
657
e291e7b9
ILT		 658 // Add a new reloc argument, returning the index in the vector.
659 size_t
fc51264f 660 add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym)
e291e7b9
ILT		 661 {
662 this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym));
663 return this->tlsdesc_reloc_info_.size() - 1;
664 }
665
2e702c99
RM		 666 Output_data_plt_x86_64<size>*
667 make_data_plt(Layout* layout,
668 Output_data_got<64, false>* got,
57b2284c 669 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 670 Output_data_space* got_irelative)
671 {
672 return this->do_make_data_plt(layout, got, got_plt, got_irelative);
673 }
674
675 Output_data_plt_x86_64<size>*
676 make_data_plt(Layout* layout,
677 Output_data_got<64, false>* got,
57b2284c 678 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 679 Output_data_space* got_irelative,
680 unsigned int plt_count)
681 {
682 return this->do_make_data_plt(layout, got, got_plt, got_irelative,
683 plt_count);
684 }
685
686 virtual Output_data_plt_x86_64<size>*
687 do_make_data_plt(Layout* layout,
688 Output_data_got<64, false>* got,
57b2284c 689 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 690 Output_data_space* got_irelative)
691 {
692 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
693 got_irelative);
694 }
695
696 virtual Output_data_plt_x86_64<size>*
697 do_make_data_plt(Layout* layout,
698 Output_data_got<64, false>* got,
57b2284c 699 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 700 Output_data_space* got_irelative,
701 unsigned int plt_count)
702 {
703 return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt,
704 got_irelative,
705 plt_count);
706 }
707
2e30d253
ILT		 708 private:
709 // The class which scans relocations.
a036edd8 710 class Scan
2e30d253 711 {
a036edd8
ILT		 712 public:
713 Scan()
714 : issued_non_pic_error_(false)
715 { }
716
95a2c8d6
RS		 717 static inline int
718 get_reference_flags(unsigned int r_type);
719
2e30d253 720 inline void
ad0f2072 721 local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 722 Sized_relobj_file<size, false>* object,
2e30d253 723 unsigned int data_shndx,
07f397ab 724 Output_section* output_section,
fc51264f 725 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
bfdfa4cd
AM		 726 const elfcpp::Sym<size, false>& lsym,
727 bool is_discarded);
2e30d253
ILT		 728
729 inline void
ad0f2072 730 global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
fc51264f 731 Sized_relobj_file<size, false>* object,
2e30d253 732 unsigned int data_shndx,
07f397ab 733 Output_section* output_section,
fc51264f 734 const elfcpp::Rela<size, false>& reloc, unsigned int r_type,
2e30d253 735 Symbol* gsym);
e041f13d 736
21bb3914
ST		 737 inline bool
738 local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
739 Target_x86_64* target,
2e702c99
RM		 740 Sized_relobj_file<size, false>* object,
741 unsigned int data_shndx,
742 Output_section* output_section,
743 const elfcpp::Rela<size, false>& reloc,
21bb3914 744 unsigned int r_type,
2e702c99 745 const elfcpp::Sym<size, false>& lsym);
21bb3914
ST		 746
747 inline bool
748 global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
2e702c99
RM		 749 Target_x86_64* target,
750 Sized_relobj_file<size, false>* object,
751 unsigned int data_shndx,
752 Output_section* output_section,
753 const elfcpp::Rela<size, false>& reloc,
21bb3914 754 unsigned int r_type,
2e702c99 755 Symbol* gsym);
21bb3914 756
a036edd8 757 private:
e041f13d 758 static void
fc51264f
L		 759 unsupported_reloc_local(Sized_relobj_file<size, false>*,
760 unsigned int r_type);
e041f13d
ILT		 761
762 static void
fc51264f
L		 763 unsupported_reloc_global(Sized_relobj_file<size, false>*,
764 unsigned int r_type, Symbol*);
a036edd8
ILT		 765
766 void
a29b0dad 767 check_non_pic(Relobj*, unsigned int r_type, Symbol*);
a036edd8 768
21bb3914
ST		 769 inline bool
770 possible_function_pointer_reloc(unsigned int r_type);
771
7223e9ca 772 bool
fc51264f 773 reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*,
6fa2a40b 774 unsigned int r_type);
7223e9ca 775
a036edd8
ILT		 776 // Whether we have issued an error about a non-PIC compilation.
777 bool issued_non_pic_error_;
2e30d253
ILT		 778 };
779
780 // The class which implements relocation.
781 class Relocate
782 {
783 public:
784 Relocate()
36171d64 785 : skip_call_tls_get_addr_(false)
2e30d253
ILT		 786 { }
787
788 ~Relocate()
789 {
790 if (this->skip_call_tls_get_addr_)
791 {
792 // FIXME: This needs to specify the location somehow.
a0c4fb0a 793 gold_error(_("missing expected TLS relocation"));
2e30d253
ILT		 794 }
795 }
796
797 // Do a relocation. Return false if the caller should not issue
798 // any warnings about this relocation.
799 inline bool
91a65d2f
AM		 800 relocate(const Relocate_info<size, false>*, unsigned int,
801 Target_x86_64*, Output_section*, size_t, const unsigned char*,
802 const Sized_symbol<size>*, const Symbol_value<size>*,
fc51264f 803 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 804 section_size_type);
2e30d253
ILT		 805
806 private:
807 // Do a TLS relocation.
808 inline void
fc51264f 809 relocate_tls(const Relocate_info<size, false>*, Target_x86_64*,
2e702c99 810 size_t relnum, const elfcpp::Rela<size, false>&,
fc51264f
L		 811 unsigned int r_type, const Sized_symbol<size>*,
812 const Symbol_value<size>*,
813 unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 814 section_size_type);
2e30d253 815
c2b45e22 816 // Do a TLS General-Dynamic to Initial-Exec transition.
7bf1f802 817 inline void
fc51264f 818 tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
fc51264f
L		 819 const elfcpp::Rela<size, false>&, unsigned int r_type,
820 typename elfcpp::Elf_types<size>::Elf_Addr value,
7bf1f802 821 unsigned char* view,
fc51264f 822 typename elfcpp::Elf_types<size>::Elf_Addr,
fe8718a4 823 section_size_type view_size);
7bf1f802 824
56622147
ILT		 825 // Do a TLS General-Dynamic to Local-Exec transition.
826 inline void
fc51264f 827 tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 828 Output_segment* tls_segment,
fc51264f
L		 829 const elfcpp::Rela<size, false>&, unsigned int r_type,
830 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 831 unsigned char* view,
fe8718a4 832 section_size_type view_size);
2e30d253 833
c2b45e22
CC		 834 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
835 inline void
fc51264f 836 tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum,
fc51264f
L		 837 const elfcpp::Rela<size, false>&, unsigned int r_type,
838 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 839 unsigned char* view,
fc51264f 840 typename elfcpp::Elf_types<size>::Elf_Addr,
c2b45e22
CC		 841 section_size_type view_size);
842
843 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
844 inline void
fc51264f 845 tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum,
c2b45e22 846 Output_segment* tls_segment,
fc51264f
L		 847 const elfcpp::Rela<size, false>&, unsigned int r_type,
848 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 849 unsigned char* view,
850 section_size_type view_size);
851
56622147 852 // Do a TLS Local-Dynamic to Local-Exec transition.
2e30d253 853 inline void
fc51264f 854 tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum,
2e30d253 855 Output_segment* tls_segment,
fc51264f
L		 856 const elfcpp::Rela<size, false>&, unsigned int r_type,
857 typename elfcpp::Elf_types<size>::Elf_Addr value,
2e30d253 858 unsigned char* view,
fe8718a4 859 section_size_type view_size);
2e30d253 860
56622147
ILT		 861 // Do a TLS Initial-Exec to Local-Exec transition.
862 static inline void
fc51264f 863 tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum,
72ec2876 864 Output_segment* tls_segment,
fc51264f
L		 865 const elfcpp::Rela<size, false>&, unsigned int r_type,
866 typename elfcpp::Elf_types<size>::Elf_Addr value,
72ec2876 867 unsigned char* view,
fe8718a4 868 section_size_type view_size);
2e30d253
ILT		 869
870 // This is set if we should skip the next reloc, which should be a
871 // PLT32 reloc against ___tls_get_addr.
872 bool skip_call_tls_get_addr_;
873 };
874
1fa29f10
IT		 875 // Check if relocation against this symbol is a candidate for
876 // conversion from
877 // mov foo@GOTPCREL(%rip), %reg
878 // to lea foo(%rip), %reg.
879 static bool
880 can_convert_mov_to_lea(const Symbol* gsym)
881 {
882 gold_assert(gsym != NULL);
883 return (gsym->type() != elfcpp::STT_GNU_IFUNC
884 && !gsym->is_undefined ()
885 && !gsym->is_from_dynobj()
886 && !gsym->is_preemptible()
887 && (!parameters->options().shared()
888 || (gsym->visibility() != elfcpp::STV_DEFAULT
889 && gsym->visibility() != elfcpp::STV_PROTECTED)
890 || parameters->options().Bsymbolic())
891 && strcmp(gsym->name(), "_DYNAMIC") != 0);
892 }
893
2e30d253
ILT		 894 // Adjust TLS relocation type based on the options and whether this
895 // is a local symbol.
e041f13d 896 static tls::Tls_optimization
2e30d253
ILT		 897 optimize_tls_reloc(bool is_final, int r_type);
898
899 // Get the GOT section, creating it if necessary.
900 Output_data_got<64, false>*
901 got_section(Symbol_table*, Layout*);
902
96f2030e 903 // Get the GOT PLT section.
57b2284c 904 Output_data_got_plt_x86_64*
96f2030e
ILT		 905 got_plt_section() const
906 {
907 gold_assert(this->got_plt_ != NULL);
908 return this->got_plt_;
909 }
910
a8df5856
ILT		 911 // Get the GOT section for TLSDESC entries.
912 Output_data_got<64, false>*
913 got_tlsdesc_section() const
914 {
915 gold_assert(this->got_tlsdesc_ != NULL);
916 return this->got_tlsdesc_;
917 }
918
c2b45e22
CC		 919 // Create the PLT section.
920 void
921 make_plt_section(Symbol_table* symtab, Layout* layout);
922
2e30d253
ILT		 923 // Create a PLT entry for a global symbol.
924 void
925 make_plt_entry(Symbol_table*, Layout*, Symbol*);
926
7223e9ca
ILT		 927 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
928 void
929 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
fc51264f 930 Sized_relobj_file<size, false>* relobj,
7223e9ca
ILT		 931 unsigned int local_sym_index);
932
9fa33bee 933 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 934 void
935 define_tls_base_symbol(Symbol_table*, Layout*);
936
c2b45e22
CC		 937 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
938 void
939 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
940
31d60480
ILT		 941 // Create a GOT entry for the TLS module index.
942 unsigned int
943 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
fc51264f 944 Sized_relobj_file<size, false>* object);
31d60480 945
2e30d253 946 // Get the PLT section.
fc51264f 947 Output_data_plt_x86_64<size>*
2e30d253
ILT		 948 plt_section() const
949 {
950 gold_assert(this->plt_ != NULL);
951 return this->plt_;
952 }
953
954 // Get the dynamic reloc section, creating it if necessary.
955 Reloc_section*
0ffd9845 956 rela_dyn_section(Layout*);
2e30d253 957
e291e7b9
ILT		 958 // Get the section to use for TLSDESC relocations.
959 Reloc_section*
960 rela_tlsdesc_section(Layout*) const;
961
67181c72
ILT		 962 // Get the section to use for IRELATIVE relocations.
963 Reloc_section*
964 rela_irelative_section(Layout*);
965
12c0daef 966 // Add a potential copy relocation.
2e30d253 967 void
ef9beddf 968 copy_reloc(Symbol_table* symtab, Layout* layout,
2e702c99 969 Sized_relobj_file<size, false>* object,
12c0daef 970 unsigned int shndx, Output_section* output_section,
fc51264f 971 Symbol* sym, const elfcpp::Rela<size, false>& reloc)
12c0daef 972 {
859d7987 973 unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info());
12c0daef 974 this->copy_relocs_.copy_reloc(symtab, layout,
fc51264f 975 symtab->get_sized_symbol<size>(sym),
12c0daef 976 object, shndx, output_section,
859d7987
CC		 977 r_type, reloc.get_r_offset(),
978 reloc.get_r_addend(),
979 this->rela_dyn_section(layout));
12c0daef 980 }
2e30d253
ILT		 981
982 // Information about this specific target which we pass to the
983 // general Target structure.
984 static const Target::Target_info x86_64_info;
985
0e70b911
CC		 986 // The types of GOT entries needed for this platform.
987 // These values are exposed to the ABI in an incremental link.
988 // Do not renumber existing values without changing the version
989 // number of the .gnu_incremental_inputs section.
0a65a3a7
CC		 990 enum Got_type
991 {
992 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
993 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
994 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
995 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
996 };
997
e291e7b9
ILT		 998 // This type is used as the argument to the target specific
999 // relocation routines. The only target specific reloc is
1000 // R_X86_64_TLSDESC against a local symbol.
1001 struct Tlsdesc_info
1002 {
fc51264f 1003 Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym)
e291e7b9
ILT		 1004 : object(a_object), r_sym(a_r_sym)
1005 { }
1006
1007 // The object in which the local symbol is defined.
fc51264f 1008 Sized_relobj_file<size, false>* object;
e291e7b9
ILT		 1009 // The local symbol index in the object.
1010 unsigned int r_sym;
1011 };
1012
2e30d253
ILT		 1013 // The GOT section.
1014 Output_data_got<64, false>* got_;
1015 // The PLT section.
fc51264f 1016 Output_data_plt_x86_64<size>* plt_;
2e30d253 1017 // The GOT PLT section.
57b2284c 1018 Output_data_got_plt_x86_64* got_plt_;
67181c72
ILT		 1019 // The GOT section for IRELATIVE relocations.
1020 Output_data_space* got_irelative_;
a8df5856
ILT		 1021 // The GOT section for TLSDESC relocations.
1022 Output_data_got<64, false>* got_tlsdesc_;
e785ec03
ILT		 1023 // The _GLOBAL_OFFSET_TABLE_ symbol.
1024 Symbol* global_offset_table_;
2e30d253 1025 // The dynamic reloc section.
0ffd9845 1026 Reloc_section* rela_dyn_;
67181c72
ILT		 1027 // The section to use for IRELATIVE relocs.
1028 Reloc_section* rela_irelative_;
2e30d253 1029 // Relocs saved to avoid a COPY reloc.
fc51264f 1030 Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_;
c2b45e22 1031 // Offset of the GOT entry for the TLS module index.
31d60480 1032 unsigned int got_mod_index_offset_;
e291e7b9
ILT		 1033 // We handle R_X86_64_TLSDESC against a local symbol as a target
1034 // specific relocation. Here we store the object and local symbol
1035 // index for the relocation.
1036 std::vector<Tlsdesc_info> tlsdesc_reloc_info_;
edfbb029
CC		 1037 // True if the _TLS_MODULE_BASE_ symbol has been defined.
1038 bool tls_base_symbol_defined_;
2e30d253
ILT		 1039};
1040
fc51264f
L		 1041template<>
1042const Target::Target_info Target_x86_64<64>::x86_64_info =
2e30d253
ILT		 1043{
1044 64, // size
1045 false, // is_big_endian
1046 elfcpp::EM_X86_64, // machine_code
1047 false, // has_make_symbol
1048 false, // has_resolve
1049 true, // has_code_fill
35cdfc9a 1050 true, // is_default_stack_executable
b3ce541e 1051 true, // can_icf_inline_merge_sections
0864d551 1052 '\0', // wrap_char
2e30d253 1053 "/lib/ld64.so.1", // program interpreter
0c5e9c22 1054 0x400000, // default_text_segment_address
cd72c291 1055 0x1000, // abi_pagesize (overridable by -z max-page-size)
8a5e3e08 1056 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1057 false, // isolate_execinstr
1058 0, // rosegment_gap
8a5e3e08
ILT		 1059 elfcpp::SHN_UNDEF, // small_common_shndx
1060 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1061 0, // small_common_section_flags
05a352e6
DK		 1062 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1063 NULL, // attributes_section
a67858e0 1064 NULL, // attributes_vendor
8d9743bd
MK		 1065 "_start", // entry_symbol_name
1066 32, // hash_entry_size
2e30d253
ILT		 1067};
1068
fc51264f
L		 1069template<>
1070const Target::Target_info Target_x86_64<32>::x86_64_info =
1071{
1072 32, // size
1073 false, // is_big_endian
1074 elfcpp::EM_X86_64, // machine_code
1075 false, // has_make_symbol
1076 false, // has_resolve
1077 true, // has_code_fill
1078 true, // is_default_stack_executable
1079 true, // can_icf_inline_merge_sections
1080 '\0', // wrap_char
1081 "/libx32/ldx32.so.1", // program interpreter
1082 0x400000, // default_text_segment_address
1083 0x1000, // abi_pagesize (overridable by -z max-page-size)
1084 0x1000, // common_pagesize (overridable by -z common-page-size)
2e702c99
RM		 1085 false, // isolate_execinstr
1086 0, // rosegment_gap
fc51264f
L		 1087 elfcpp::SHN_UNDEF, // small_common_shndx
1088 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
1089 0, // small_common_section_flags
1090 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
1091 NULL, // attributes_section
a67858e0 1092 NULL, // attributes_vendor
8d9743bd
MK		 1093 "_start", // entry_symbol_name
1094 32, // hash_entry_size
fc51264f
L		 1095};
1096
8a5e3e08
ILT		 1097// This is called when a new output section is created. This is where
1098// we handle the SHF_X86_64_LARGE.
1099
fc51264f 1100template<int size>
8a5e3e08 1101void
fc51264f 1102Target_x86_64<size>::do_new_output_section(Output_section* os) const
8a5e3e08
ILT		 1103{
1104 if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
1105 os->set_is_large_section();
1106}
1107
2e30d253
ILT		 1108// Get the GOT section, creating it if necessary.
1109
fc51264f 1110template<int size>
2e30d253 1111Output_data_got<64, false>*
fc51264f 1112Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout)
2e30d253
ILT		 1113{
1114 if (this->got_ == NULL)
1115 {
1116 gold_assert(symtab != NULL && layout != NULL);
1117
9446efde
ILT		 1118 // When using -z now, we can treat .got.plt as a relro section.
1119 // Without -z now, it is modified after program startup by lazy
1120 // PLT relocations.
1121 bool is_got_plt_relro = parameters->options().now();
1122 Output_section_order got_order = (is_got_plt_relro
1123 ? ORDER_RELRO
1124 : ORDER_RELRO_LAST);
1125 Output_section_order got_plt_order = (is_got_plt_relro
1126 ? ORDER_RELRO
1127 : ORDER_NON_RELRO_FIRST);
1128
2e30d253
ILT		 1129 this->got_ = new Output_data_got<64, false>();
1130
82742395
ILT		 1131 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1132 (elfcpp::SHF_ALLOC
1133 | elfcpp::SHF_WRITE),
9446efde 1134 this->got_, got_order, true);
2e30d253 1135
57b2284c 1136 this->got_plt_ = new Output_data_got_plt_x86_64(layout);
82742395
ILT		 1137 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1138 (elfcpp::SHF_ALLOC
1139 | elfcpp::SHF_WRITE),
9446efde
ILT		 1140 this->got_plt_, got_plt_order,
1141 is_got_plt_relro);
2e30d253
ILT		 1142
1143 // The first three entries are reserved.
27bc2bce 1144 this->got_plt_->set_current_data_size(3 * 8);
2e30d253 1145
9446efde
ILT		 1146 if (!is_got_plt_relro)
1147 {
1148 // Those bytes can go into the relro segment.
1149 layout->increase_relro(3 * 8);
1150 }
1a2dff53 1151
2e30d253 1152 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
e785ec03
ILT		 1153 this->global_offset_table_ =
1154 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1155 Symbol_table::PREDEFINED,
1156 this->got_plt_,
1157 0, 0, elfcpp::STT_OBJECT,
1158 elfcpp::STB_LOCAL,
1159 elfcpp::STV_HIDDEN, 0,
1160 false, false);
a8df5856 1161
67181c72
ILT		 1162 // If there are any IRELATIVE relocations, they get GOT entries
1163 // in .got.plt after the jump slot entries.
1164 this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT");
1165 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1166 (elfcpp::SHF_ALLOC
1167 | elfcpp::SHF_WRITE),
1168 this->got_irelative_,
9446efde 1169 got_plt_order, is_got_plt_relro);
67181c72 1170
a8df5856 1171 // If there are any TLSDESC relocations, they get GOT entries in
67181c72 1172 // .got.plt after the jump slot and IRELATIVE entries.
a8df5856
ILT		 1173 this->got_tlsdesc_ = new Output_data_got<64, false>();
1174 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1175 (elfcpp::SHF_ALLOC
1176 | elfcpp::SHF_WRITE),
22f0da72 1177 this->got_tlsdesc_,
9446efde 1178 got_plt_order, is_got_plt_relro);
2e30d253
ILT		 1179 }
1180
1181 return this->got_;
1182}
1183
1184// Get the dynamic reloc section, creating it if necessary.
1185
fc51264f
L		 1186template<int size>
1187typename Target_x86_64<size>::Reloc_section*
1188Target_x86_64<size>::rela_dyn_section(Layout* layout)
2e30d253 1189{
0ffd9845 1190 if (this->rela_dyn_ == NULL)
2e30d253
ILT		 1191 {
1192 gold_assert(layout != NULL);
d98bc257 1193 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
2e30d253 1194 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
22f0da72
ILT		 1195 elfcpp::SHF_ALLOC, this->rela_dyn_,
1196 ORDER_DYNAMIC_RELOCS, false);
2e30d253 1197 }
0ffd9845 1198 return this->rela_dyn_;
2e30d253
ILT		 1199}
1200
67181c72
ILT		 1201// Get the section to use for IRELATIVE relocs, creating it if
1202// necessary. These go in .rela.dyn, but only after all other dynamic
1203// relocations. They need to follow the other dynamic relocations so
1204// that they can refer to global variables initialized by those
1205// relocs.
1206
fc51264f
L		 1207template<int size>
1208typename Target_x86_64<size>::Reloc_section*
1209Target_x86_64<size>::rela_irelative_section(Layout* layout)
67181c72
ILT		 1210{
1211 if (this->rela_irelative_ == NULL)
1212 {
1213 // Make sure we have already created the dynamic reloc section.
1214 this->rela_dyn_section(layout);
1215 this->rela_irelative_ = new Reloc_section(false);
1216 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1217 elfcpp::SHF_ALLOC, this->rela_irelative_,
1218 ORDER_DYNAMIC_RELOCS, false);
1219 gold_assert(this->rela_dyn_->output_section()
1220 == this->rela_irelative_->output_section());
1221 }
1222 return this->rela_irelative_;
1223}
1224
57b2284c
CC		 1225// Write the first three reserved words of the .got.plt section.
1226// The remainder of the section is written while writing the PLT
1227// in Output_data_plt_i386::do_write.
1228
1229void
1230Output_data_got_plt_x86_64::do_write(Output_file* of)
1231{
1232 // The first entry in the GOT is the address of the .dynamic section
1233 // aka the PT_DYNAMIC segment. The next two entries are reserved.
1234 // We saved space for them when we created the section in
1235 // Target_x86_64::got_section.
1236 const off_t got_file_offset = this->offset();
1237 gold_assert(this->data_size() >= 24);
1238 unsigned char* const got_view = of->get_output_view(got_file_offset, 24);
1239 Output_section* dynamic = this->layout_->dynamic_section();
1240 uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address();
1241 elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr);
1242 memset(got_view + 8, 0, 16);
1243 of->write_output_view(got_file_offset, 24, got_view);
1244}
1245
4829d394 1246// Initialize the PLT section.
2e30d253 1247
fc51264f 1248template<int size>
4829d394 1249void
fc51264f 1250Output_data_plt_x86_64<size>::init(Layout* layout)
2e30d253 1251{
d98bc257 1252 this->rel_ = new Reloc_section(false);
2e30d253 1253 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
22f0da72
ILT		 1254 elfcpp::SHF_ALLOC, this->rel_,
1255 ORDER_DYNAMIC_PLT_RELOCS, false);
2e30d253
ILT		 1256}
1257
fc51264f 1258template<int size>
2e30d253 1259void
fc51264f 1260Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os)
2e30d253 1261{
2e702c99 1262 os->set_entsize(this->get_plt_entry_size());
2e30d253
ILT		 1263}
1264
1265// Add an entry to the PLT.
1266
fc51264f 1267template<int size>
2e30d253 1268void
fc51264f
L		 1269Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout,
1270 Symbol* gsym)
2e30d253
ILT		 1271{
1272 gold_assert(!gsym->has_plt_offset());
1273
4829d394
CC		 1274 unsigned int plt_index;
1275 off_t plt_offset;
1276 section_offset_type got_offset;
2e30d253 1277
67181c72
ILT		 1278 unsigned int* pcount;
1279 unsigned int offset;
1280 unsigned int reserved;
57b2284c 1281 Output_section_data_build* got;
67181c72
ILT		 1282 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1283 && gsym->can_use_relative_reloc(false))
1284 {
1285 pcount = &this->irelative_count_;
1286 offset = 0;
1287 reserved = 0;
1288 got = this->got_irelative_;
1289 }
1290 else
1291 {
1292 pcount = &this->count_;
1293 offset = 1;
1294 reserved = 3;
1295 got = this->got_plt_;
1296 }
1297
4829d394
CC		 1298 if (!this->is_data_size_valid())
1299 {
67181c72
ILT		 1300 // Note that when setting the PLT offset for a non-IRELATIVE
1301 // entry we skip the initial reserved PLT entry.
1302 plt_index = *pcount + offset;
2e702c99 1303 plt_offset = plt_index * this->get_plt_entry_size();
2e30d253 1304
67181c72 1305 ++*pcount;
2e30d253 1306
67181c72
ILT		 1307 got_offset = (plt_index - offset + reserved) * 8;
1308 gold_assert(got_offset == got->current_data_size());
2e30d253 1309
4829d394
CC		 1310 // Every PLT entry needs a GOT entry which points back to the PLT
1311 // entry (this will be changed by the dynamic linker, normally
1312 // lazily when the function is called).
67181c72 1313 got->set_current_data_size(got_offset + 8);
4829d394 1314 }
7223e9ca
ILT		 1315 else
1316 {
67181c72
ILT		 1317 // FIXME: This is probably not correct for IRELATIVE relocs.
1318
4829d394 1319 // For incremental updates, find an available slot.
2e702c99
RM		 1320 plt_offset = this->free_list_.allocate(this->get_plt_entry_size(),
1321 this->get_plt_entry_size(), 0);
4829d394 1322 if (plt_offset == -1)
e6455dfb
CC		 1323 gold_fallback(_("out of patch space (PLT);"
1324 " relink with --incremental-full"));
4829d394
CC		 1325
1326 // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset
1327 // can be calculated from the PLT index, adjusting for the three
1328 // reserved entries at the beginning of the GOT.
2e702c99 1329 plt_index = plt_offset / this->get_plt_entry_size() - 1;
67181c72 1330 got_offset = (plt_index - offset + reserved) * 8;
7223e9ca 1331 }
2e30d253 1332
4829d394
CC		 1333 gsym->set_plt_offset(plt_offset);
1334
1335 // Every PLT entry needs a reloc.
67181c72 1336 this->add_relocation(symtab, layout, gsym, got_offset);
4829d394 1337
2e30d253
ILT		 1338 // Note that we don't need to save the symbol. The contents of the
1339 // PLT are independent of which symbols are used. The symbols only
1340 // appear in the relocations.
1341}
1342
7223e9ca
ILT		 1343// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
1344// the PLT offset.
1345
fc51264f 1346template<int size>
7223e9ca 1347unsigned int
fc51264f 1348Output_data_plt_x86_64<size>::add_local_ifunc_entry(
67181c72
ILT		 1349 Symbol_table* symtab,
1350 Layout* layout,
fc51264f 1351 Sized_relobj_file<size, false>* relobj,
6fa2a40b 1352 unsigned int local_sym_index)
7223e9ca 1353{
2e702c99 1354 unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size();
67181c72 1355 ++this->irelative_count_;
7223e9ca 1356
67181c72 1357 section_offset_type got_offset = this->got_irelative_->current_data_size();
7223e9ca
ILT		 1358
1359 // Every PLT entry needs a GOT entry which points back to the PLT
1360 // entry.
67181c72 1361 this->got_irelative_->set_current_data_size(got_offset + 8);
7223e9ca
ILT		 1362
1363 // Every PLT entry needs a reloc.
67181c72
ILT		 1364 Reloc_section* rela = this->rela_irelative(symtab, layout);
1365 rela->add_symbolless_local_addend(relobj, local_sym_index,
1366 elfcpp::R_X86_64_IRELATIVE,
1367 this->got_irelative_, got_offset, 0);
7223e9ca
ILT		 1368
1369 return plt_offset;
1370}
1371
4829d394
CC		 1372// Add the relocation for a PLT entry.
1373
fc51264f 1374template<int size>
4829d394 1375void
fc51264f
L		 1376Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab,
1377 Layout* layout,
1378 Symbol* gsym,
1379 unsigned int got_offset)
4829d394
CC		 1380{
1381 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1382 && gsym->can_use_relative_reloc(false))
67181c72
ILT		 1383 {
1384 Reloc_section* rela = this->rela_irelative(symtab, layout);
1385 rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE,
1386 this->got_irelative_, got_offset, 0);
1387 }
4829d394
CC		 1388 else
1389 {
1390 gsym->set_needs_dynsym_entry();
1391 this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
1392 got_offset, 0);
1393 }
1394}
1395
e291e7b9
ILT		 1396// Return where the TLSDESC relocations should go, creating it if
1397// necessary. These follow the JUMP_SLOT relocations.
1398
fc51264f
L		 1399template<int size>
1400typename Output_data_plt_x86_64<size>::Reloc_section*
1401Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout)
e291e7b9
ILT		 1402{
1403 if (this->tlsdesc_rel_ == NULL)
1404 {
1405 this->tlsdesc_rel_ = new Reloc_section(false);
1406 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1407 elfcpp::SHF_ALLOC, this->tlsdesc_rel_,
22f0da72 1408 ORDER_DYNAMIC_PLT_RELOCS, false);
67181c72
ILT		 1409 gold_assert(this->tlsdesc_rel_->output_section()
1410 == this->rel_->output_section());
e291e7b9
ILT		 1411 }
1412 return this->tlsdesc_rel_;
1413}
1414
67181c72
ILT		 1415// Return where the IRELATIVE relocations should go in the PLT. These
1416// follow the JUMP_SLOT and the TLSDESC relocations.
1417
fc51264f
L		 1418template<int size>
1419typename Output_data_plt_x86_64<size>::Reloc_section*
1420Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab,
1421 Layout* layout)
67181c72
ILT		 1422{
1423 if (this->irelative_rel_ == NULL)
1424 {
1425 // Make sure we have a place for the TLSDESC relocations, in
1426 // case we see any later on.
1427 this->rela_tlsdesc(layout);
1428 this->irelative_rel_ = new Reloc_section(false);
1429 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1430 elfcpp::SHF_ALLOC, this->irelative_rel_,
1431 ORDER_DYNAMIC_PLT_RELOCS, false);
1432 gold_assert(this->irelative_rel_->output_section()
1433 == this->rel_->output_section());
1434
1435 if (parameters->doing_static_link())
1436 {
1437 // A statically linked executable will only have a .rela.plt
1438 // section to hold R_X86_64_IRELATIVE relocs for
1439 // STT_GNU_IFUNC symbols. The library will use these
1440 // symbols to locate the IRELATIVE relocs at program startup
1441 // time.
1442 symtab->define_in_output_data("__rela_iplt_start", NULL,
1443 Symbol_table::PREDEFINED,
1444 this->irelative_rel_, 0, 0,
1445 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1446 elfcpp::STV_HIDDEN, 0, false, true);
1447 symtab->define_in_output_data("__rela_iplt_end", NULL,
1448 Symbol_table::PREDEFINED,
1449 this->irelative_rel_, 0, 0,
1450 elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL,
1451 elfcpp::STV_HIDDEN, 0, true, true);
1452 }
1453 }
1454 return this->irelative_rel_;
1455}
1456
1457// Return the PLT address to use for a global symbol.
1458
fc51264f 1459template<int size>
67181c72 1460uint64_t
fc51264f 1461Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym)
67181c72
ILT		 1462{
1463 uint64_t offset = 0;
1464 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1465 && gsym->can_use_relative_reloc(false))
2e702c99 1466 offset = (this->count_ + 1) * this->get_plt_entry_size();
19fec8c1 1467 return this->address() + offset + gsym->plt_offset();
67181c72
ILT		 1468}
1469
1470// Return the PLT address to use for a local symbol. These are always
1471// IRELATIVE relocs.
1472
fc51264f 1473template<int size>
67181c72 1474uint64_t
19fec8c1
AM		 1475Output_data_plt_x86_64<size>::address_for_local(const Relobj* object,
1476 unsigned int r_sym)
67181c72 1477{
19fec8c1
AM		 1478 return (this->address()
1479 + (this->count_ + 1) * this->get_plt_entry_size()
1480 + object->local_plt_offset(r_sym));
67181c72
ILT		 1481}
1482
c2b45e22 1483// Set the final size.
fc51264f 1484template<int size>
c2b45e22 1485void
fc51264f 1486Output_data_plt_x86_64<size>::set_final_data_size()
c2b45e22 1487{
67181c72 1488 unsigned int count = this->count_ + this->irelative_count_;
c2b45e22
CC		 1489 if (this->has_tlsdesc_entry())
1490 ++count;
2e702c99 1491 this->set_data_size((count + 1) * this->get_plt_entry_size());
c2b45e22
CC		 1492}
1493
2e30d253
ILT		 1494// The first entry in the PLT for an executable.
1495
fc51264f
L		 1496template<int size>
1497const unsigned char
2e702c99 1498Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] =
2e30d253
ILT		 1499{
1500 // From AMD64 ABI Draft 0.98, page 76
1501 0xff, 0x35, // pushq contents of memory address
2e30d253 1502 0, 0, 0, 0, // replaced with address of .got + 8
78d911fd
ILT		 1503 0xff, 0x25, // jmp indirect
1504 0, 0, 0, 0, // replaced with address of .got + 16
2e30d253
ILT		 1505 0x90, 0x90, 0x90, 0x90 // noop (x4)
1506};
1507
2e702c99
RM		 1508template<int size>
1509void
1510Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry(
1511 unsigned char* pov,
1512 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1513 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
1514{
1515 memcpy(pov, first_plt_entry, plt_entry_size);
1516 // We do a jmp relative to the PC at the end of this instruction.
1517 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1518 (got_address + 8
1519 - (plt_address + 6)));
1520 elfcpp::Swap<32, false>::writeval(pov + 8,
1521 (got_address + 16
1522 - (plt_address + 12)));
1523}
1524
2e30d253
ILT		 1525// Subsequent entries in the PLT for an executable.
1526
fc51264f
L		 1527template<int size>
1528const unsigned char
2e702c99 1529Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] =
2e30d253
ILT		 1530{
1531 // From AMD64 ABI Draft 0.98, page 76
1532 0xff, 0x25, // jmpq indirect
1533 0, 0, 0, 0, // replaced with address of symbol in .got
1534 0x68, // pushq immediate
1535 0, 0, 0, 0, // replaced with offset into relocation table
1536 0xe9, // jmpq relative
1537 0, 0, 0, 0 // replaced with offset to start of .plt
1538};
1539
2e702c99
RM		 1540template<int size>
1541unsigned int
1542Output_data_plt_x86_64_standard<size>::do_fill_plt_entry(
1543 unsigned char* pov,
1544 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1545 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1546 unsigned int got_offset,
1547 unsigned int plt_offset,
1548 unsigned int plt_index)
1549{
9d585188
L		 1550 // Check PC-relative offset overflow in PLT entry.
1551 uint64_t plt_got_pcrel_offset = (got_address + got_offset
1552 - (plt_address + plt_offset + 6));
1553 if (Bits<32>::has_overflow(plt_got_pcrel_offset))
1554 gold_error(_("PC-relative offset overflow in PLT entry %d"),
1555 plt_index + 1);
1556
2e702c99
RM		 1557 memcpy(pov, plt_entry, plt_entry_size);
1558 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
9d585188 1559 plt_got_pcrel_offset);
2e702c99
RM		 1560
1561 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
1562 elfcpp::Swap<32, false>::writeval(pov + 12,
1563 - (plt_offset + plt_entry_size));
1564
1565 return 6;
1566}
1567
c2b45e22
CC		 1568// The reserved TLSDESC entry in the PLT for an executable.
1569
fc51264f
L		 1570template<int size>
1571const unsigned char
2e702c99 1572Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] =
c2b45e22
CC		 1573{
1574 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
1575 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
1576 0xff, 0x35, // pushq x(%rip)
1577 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
1578 0xff, 0x25, // jmpq *y(%rip)
1579 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
1580 0x0f, 0x1f, // nop
1581 0x40, 0
1582};
1583
2e702c99
RM		 1584template<int size>
1585void
1586Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry(
1587 unsigned char* pov,
1588 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
1589 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
1590 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
1591 unsigned int tlsdesc_got_offset,
1592 unsigned int plt_offset)
1593{
1594 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
1595 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1596 (got_address + 8
1597 - (plt_address + plt_offset
1598 + 6)));
1599 elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
1600 (got_base
1601 + tlsdesc_got_offset
1602 - (plt_address + plt_offset
1603 + 12)));
1604}
1605
07a60597
ILT		 1606// The .eh_frame unwind information for the PLT.
1607
fc51264f 1608template<int size>
2e702c99 1609const unsigned char
fc51264f 1610Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] =
07a60597
ILT		 1611{
1612 1, // CIE version.
1613 'z', // Augmentation: augmentation size included.
1614 'R', // Augmentation: FDE encoding included.
1615 '\0', // End of augmentation string.
1616 1, // Code alignment factor.
1617 0x78, // Data alignment factor.
1618 16, // Return address column.
1619 1, // Augmentation size.
1620 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
1621 | elfcpp::DW_EH_PE_sdata4),
1622 elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8.
1623 elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8.
1624 elfcpp::DW_CFA_nop, // Align to 16 bytes.
1625 elfcpp::DW_CFA_nop
1626};
1627
fc51264f 1628template<int size>
07a60597 1629const unsigned char
2e702c99 1630Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
07a60597
ILT		 1631{
1632 0, 0, 0, 0, // Replaced with offset to .plt.
1633 0, 0, 0, 0, // Replaced with size of .plt.
1634 0, // Augmentation size.
1635 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
1636 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
1637 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
1638 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
1639 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
1640 11, // Block length.
1641 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
1642 elfcpp::DW_OP_breg16, 0, // Push %rip.
1643 elfcpp::DW_OP_lit15, // Push 0xf.
1644 elfcpp::DW_OP_and, // & (%rip & 0xf).
1645 elfcpp::DW_OP_lit11, // Push 0xb.
1646 elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb)
1647 elfcpp::DW_OP_lit3, // Push 3.
1648 elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3)
1649 elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8
1650 elfcpp::DW_CFA_nop, // Align to 32 bytes.
1651 elfcpp::DW_CFA_nop,
1652 elfcpp::DW_CFA_nop,
1653 elfcpp::DW_CFA_nop
1654};
1655
2e30d253
ILT		 1656// Write out the PLT. This uses the hand-coded instructions above,
1657// and adjusts them as needed. This is specified by the AMD64 ABI.
1658
fc51264f 1659template<int size>
2e30d253 1660void
fc51264f 1661Output_data_plt_x86_64<size>::do_write(Output_file* of)
2e30d253 1662{
2ea97941 1663 const off_t offset = this->offset();
fe8718a4
ILT		 1664 const section_size_type oview_size =
1665 convert_to_section_size_type(this->data_size());
2ea97941 1666 unsigned char* const oview = of->get_output_view(offset, oview_size);
2e30d253
ILT		 1667
1668 const off_t got_file_offset = this->got_plt_->offset();
67181c72
ILT		 1669 gold_assert(parameters->incremental_update()
1670 || (got_file_offset + this->got_plt_->data_size()
1671 == this->got_irelative_->offset()));
fe8718a4 1672 const section_size_type got_size =
67181c72
ILT		 1673 convert_to_section_size_type(this->got_plt_->data_size()
1674 + this->got_irelative_->data_size());
2e30d253
ILT		 1675 unsigned char* const got_view = of->get_output_view(got_file_offset,
1676 got_size);
1677
1678 unsigned char* pov = oview;
1679
c2b45e22 1680 // The base address of the .plt section.
fc51264f 1681 typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address();
c2b45e22 1682 // The base address of the .got section.
fc51264f 1683 typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address();
c2b45e22
CC		 1684 // The base address of the PLT portion of the .got section,
1685 // which is where the GOT pointer will point, and where the
1686 // three reserved GOT entries are located.
fc51264f
L		 1687 typename elfcpp::Elf_types<size>::Elf_Addr got_address
1688 = this->got_plt_->address();
2e30d253 1689
2e702c99
RM		 1690 this->fill_first_plt_entry(pov, got_address, plt_address);
1691 pov += this->get_plt_entry_size();
2e30d253 1692
57b2284c
CC		 1693 // The first three entries in the GOT are reserved, and are written
1694 // by Output_data_got_plt_x86_64::do_write.
1695 unsigned char* got_pov = got_view + 24;
2e30d253 1696
2e702c99 1697 unsigned int plt_offset = this->get_plt_entry_size();
2e30d253 1698 unsigned int got_offset = 24;
67181c72 1699 const unsigned int count = this->count_ + this->irelative_count_;
2e30d253
ILT		 1700 for (unsigned int plt_index = 0;
1701 plt_index < count;
1702 ++plt_index,
2e702c99 1703 pov += this->get_plt_entry_size(),
2e30d253 1704 got_pov += 8,
2e702c99 1705 plt_offset += this->get_plt_entry_size(),
2e30d253
ILT		 1706 got_offset += 8)
1707 {
1708 // Set and adjust the PLT entry itself.
2e702c99
RM		 1709 unsigned int lazy_offset = this->fill_plt_entry(pov,
1710 got_address, plt_address,
1711 got_offset, plt_offset,
1712 plt_index);
2e30d253
ILT		 1713
1714 // Set the entry in the GOT.
2e702c99
RM		 1715 elfcpp::Swap<64, false>::writeval(got_pov,
1716 plt_address + plt_offset + lazy_offset);
2e30d253
ILT		 1717 }
1718
c2b45e22
CC		 1719 if (this->has_tlsdesc_entry())
1720 {
1721 // Set and adjust the reserved TLSDESC PLT entry.
1722 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
2e702c99
RM		 1723 this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base,
1724 tlsdesc_got_offset, plt_offset);
1725 pov += this->get_plt_entry_size();
c2b45e22
CC		 1726 }
1727
fe8718a4
ILT		 1728 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1729 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2e30d253 1730
2ea97941 1731 of->write_output_view(offset, oview_size, oview);
2e30d253
ILT		 1732 of->write_output_view(got_file_offset, got_size, got_view);
1733}
1734
c2b45e22 1735// Create the PLT section.
2e30d253 1736
fc51264f 1737template<int size>
2e30d253 1738void
fc51264f 1739Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout)
2e30d253 1740{
2e30d253
ILT		 1741 if (this->plt_ == NULL)
1742 {
1743 // Create the GOT sections first.
1744 this->got_section(symtab, layout);
1745
2e702c99
RM		 1746 this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_,
1747 this->got_irelative_);
1748
1749 // Add unwind information if requested.
1750 if (parameters->options().ld_generated_unwind_info())
1751 this->plt_->add_eh_frame(layout);
1752
2e30d253
ILT		 1753 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1754 (elfcpp::SHF_ALLOC
1755 | elfcpp::SHF_EXECINSTR),
22f0da72 1756 this->plt_, ORDER_PLT, false);
7223e9ca
ILT		 1757
1758 // Make the sh_info field of .rela.plt point to .plt.
1759 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1760 rela_plt_os->set_info_section(this->plt_->output_section());
2e30d253 1761 }
c2b45e22
CC		 1762}
1763
e291e7b9
ILT		 1764// Return the section for TLSDESC relocations.
1765
fc51264f
L		 1766template<int size>
1767typename Target_x86_64<size>::Reloc_section*
1768Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const
e291e7b9
ILT		 1769{
1770 return this->plt_section()->rela_tlsdesc(layout);
1771}
1772
c2b45e22
CC		 1773// Create a PLT entry for a global symbol.
1774
fc51264f 1775template<int size>
c2b45e22 1776void
fc51264f
L		 1777Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout,
1778 Symbol* gsym)
c2b45e22
CC		 1779{
1780 if (gsym->has_plt_offset())
1781 return;
1782
1783 if (this->plt_ == NULL)
1784 this->make_plt_section(symtab, layout);
2e30d253 1785
67181c72 1786 this->plt_->add_entry(symtab, layout, gsym);
2e30d253
ILT		 1787}
1788
7223e9ca
ILT		 1789// Make a PLT entry for a local STT_GNU_IFUNC symbol.
1790
fc51264f 1791template<int size>
7223e9ca 1792void
fc51264f
L		 1793Target_x86_64<size>::make_local_ifunc_plt_entry(
1794 Symbol_table* symtab, Layout* layout,
1795 Sized_relobj_file<size, false>* relobj,
1796 unsigned int local_sym_index)
7223e9ca
ILT		 1797{
1798 if (relobj->local_has_plt_offset(local_sym_index))
1799 return;
1800 if (this->plt_ == NULL)
1801 this->make_plt_section(symtab, layout);
67181c72
ILT		 1802 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout,
1803 relobj,
7223e9ca
ILT		 1804 local_sym_index);
1805 relobj->set_local_plt_offset(local_sym_index, plt_offset);
1806}
1807
0e70b911
CC		 1808// Return the number of entries in the PLT.
1809
fc51264f 1810template<int size>
0e70b911 1811unsigned int
fc51264f 1812Target_x86_64<size>::plt_entry_count() const
0e70b911
CC		 1813{
1814 if (this->plt_ == NULL)
1815 return 0;
1816 return this->plt_->entry_count();
1817}
1818
1819// Return the offset of the first non-reserved PLT entry.
1820
fc51264f 1821template<int size>
0e70b911 1822unsigned int
fc51264f 1823Target_x86_64<size>::first_plt_entry_offset() const
0e70b911 1824{
2e702c99 1825 return this->plt_->first_plt_entry_offset();
0e70b911
CC		 1826}
1827
1828// Return the size of each PLT entry.
1829
fc51264f 1830template<int size>
0e70b911 1831unsigned int
fc51264f 1832Target_x86_64<size>::plt_entry_size() const
0e70b911 1833{
2e702c99 1834 return this->plt_->get_plt_entry_size();
0e70b911
CC		 1835}
1836
4829d394
CC		 1837// Create the GOT and PLT sections for an incremental update.
1838
fc51264f 1839template<int size>
dd74ae06 1840Output_data_got_base*
fc51264f 1841Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab,
4829d394
CC		 1842 Layout* layout,
1843 unsigned int got_count,
1844 unsigned int plt_count)
1845{
1846 gold_assert(this->got_ == NULL);
1847
1848 this->got_ = new Output_data_got<64, false>(got_count * 8);
1849 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
1850 (elfcpp::SHF_ALLOC
1851 | elfcpp::SHF_WRITE),
1852 this->got_, ORDER_RELRO_LAST,
1853 true);
1854
1855 // Add the three reserved entries.
57b2284c 1856 this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8);
4829d394
CC		 1857 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1858 (elfcpp::SHF_ALLOC
1859 | elfcpp::SHF_WRITE),
1860 this->got_plt_, ORDER_NON_RELRO_FIRST,
1861 false);
1862
1863 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
1864 this->global_offset_table_ =
1865 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
1866 Symbol_table::PREDEFINED,
1867 this->got_plt_,
1868 0, 0, elfcpp::STT_OBJECT,
1869 elfcpp::STB_LOCAL,
1870 elfcpp::STV_HIDDEN, 0,
1871 false, false);
1872
1873 // If there are any TLSDESC relocations, they get GOT entries in
1874 // .got.plt after the jump slot entries.
1875 // FIXME: Get the count for TLSDESC entries.
1876 this->got_tlsdesc_ = new Output_data_got<64, false>(0);
1877 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1878 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1879 this->got_tlsdesc_,
1880 ORDER_NON_RELRO_FIRST, false);
1881
67181c72
ILT		 1882 // If there are any IRELATIVE relocations, they get GOT entries in
1883 // .got.plt after the jump slot and TLSDESC entries.
1884 this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT");
1885 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
1886 elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE,
1887 this->got_irelative_,
1888 ORDER_NON_RELRO_FIRST, false);
1889
4829d394 1890 // Create the PLT section.
2e702c99
RM		 1891 this->plt_ = this->make_data_plt(layout, this->got_,
1892 this->got_plt_,
1893 this->got_irelative_,
1894 plt_count);
1895
1896 // Add unwind information if requested.
1897 if (parameters->options().ld_generated_unwind_info())
1898 this->plt_->add_eh_frame(layout);
1899
4829d394
CC		 1900 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1901 elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR,
1902 this->plt_, ORDER_PLT, false);
1903
1904 // Make the sh_info field of .rela.plt point to .plt.
1905 Output_section* rela_plt_os = this->plt_->rela_plt()->output_section();
1906 rela_plt_os->set_info_section(this->plt_->output_section());
1907
6fa2a40b
CC		 1908 // Create the rela_dyn section.
1909 this->rela_dyn_section(layout);
1910
4829d394
CC		 1911 return this->got_;
1912}
1913
6fa2a40b
CC		 1914// Reserve a GOT entry for a local symbol, and regenerate any
1915// necessary dynamic relocations.
1916
fc51264f 1917template<int size>
6fa2a40b 1918void
fc51264f 1919Target_x86_64<size>::reserve_local_got_entry(
6fa2a40b 1920 unsigned int got_index,
fc51264f 1921 Sized_relobj<size, false>* obj,
6fa2a40b
CC		 1922 unsigned int r_sym,
1923 unsigned int got_type)
1924{
1925 unsigned int got_offset = got_index * 8;
1926 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1927
1928 this->got_->reserve_local(got_index, obj, r_sym, got_type);
1929 switch (got_type)
1930 {
1931 case GOT_TYPE_STANDARD:
1932 if (parameters->options().output_is_position_independent())
1933 rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE,
397b129b 1934 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1935 break;
1936 case GOT_TYPE_TLS_OFFSET:
1937 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64,
1938 this->got_, got_offset, 0);
1939 break;
1940 case GOT_TYPE_TLS_PAIR:
1941 this->got_->reserve_slot(got_index + 1);
1942 rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64,
1943 this->got_, got_offset, 0);
1944 break;
1945 case GOT_TYPE_TLS_DESC:
1946 gold_fatal(_("TLS_DESC not yet supported for incremental linking"));
1947 // this->got_->reserve_slot(got_index + 1);
1948 // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
1949 // this->got_, got_offset, 0);
1950 break;
1951 default:
1952 gold_unreachable();
1953 }
1954}
1955
1956// Reserve a GOT entry for a global symbol, and regenerate any
1957// necessary dynamic relocations.
1958
fc51264f 1959template<int size>
6fa2a40b 1960void
fc51264f
L		 1961Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index,
1962 Symbol* gsym,
1963 unsigned int got_type)
6fa2a40b
CC		 1964{
1965 unsigned int got_offset = got_index * 8;
1966 Reloc_section* rela_dyn = this->rela_dyn_section(NULL);
1967
1968 this->got_->reserve_global(got_index, gsym, got_type);
1969 switch (got_type)
1970 {
1971 case GOT_TYPE_STANDARD:
1972 if (!gsym->final_value_is_known())
1973 {
1974 if (gsym->is_from_dynobj()
1975 || gsym->is_undefined()
1976 || gsym->is_preemptible()
1977 || gsym->type() == elfcpp::STT_GNU_IFUNC)
1978 rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT,
1979 this->got_, got_offset, 0);
1980 else
1981 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
13cf9988 1982 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1983 }
1984 break;
1985 case GOT_TYPE_TLS_OFFSET:
1986 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64,
13cf9988 1987 this->got_, got_offset, 0, false);
6fa2a40b
CC		 1988 break;
1989 case GOT_TYPE_TLS_PAIR:
1990 this->got_->reserve_slot(got_index + 1);
1991 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64,
13cf9988 1992 this->got_, got_offset, 0, false);
6fa2a40b 1993 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64,
13cf9988 1994 this->got_, got_offset + 8, 0, false);
6fa2a40b
CC		 1995 break;
1996 case GOT_TYPE_TLS_DESC:
1997 this->got_->reserve_slot(got_index + 1);
1998 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC,
13cf9988 1999 this->got_, got_offset, 0, false);
6fa2a40b
CC		 2000 break;
2001 default:
2002 gold_unreachable();
2003 }
2004}
2005
4829d394
CC		 2006// Register an existing PLT entry for a global symbol.
2007
fc51264f 2008template<int size>
4829d394 2009void
fc51264f
L		 2010Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab,
2011 Layout* layout,
2012 unsigned int plt_index,
2013 Symbol* gsym)
4829d394
CC		 2014{
2015 gold_assert(this->plt_ != NULL);
2016 gold_assert(!gsym->has_plt_offset());
2017
2018 this->plt_->reserve_slot(plt_index);
2019
2020 gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size());
2021
2022 unsigned int got_offset = (plt_index + 3) * 8;
67181c72 2023 this->plt_->add_relocation(symtab, layout, gsym, got_offset);
4829d394
CC		 2024}
2025
26d3c67d
CC		 2026// Force a COPY relocation for a given symbol.
2027
fc51264f 2028template<int size>
26d3c67d 2029void
fc51264f 2030Target_x86_64<size>::emit_copy_reloc(
26d3c67d
CC		 2031 Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset)
2032{
2033 this->copy_relocs_.emit_copy_reloc(symtab,
fc51264f 2034 symtab->get_sized_symbol<size>(sym),
26d3c67d
CC		 2035 os,
2036 offset,
2037 this->rela_dyn_section(NULL));
2038}
2039
9fa33bee 2040// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029 2041
fc51264f 2042template<int size>
edfbb029 2043void
fc51264f
L		 2044Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab,
2045 Layout* layout)
edfbb029
CC		 2046{
2047 if (this->tls_base_symbol_defined_)
2048 return;
2049
2050 Output_segment* tls_segment = layout->tls_segment();
2051 if (tls_segment != NULL)
2052 {
183fd0e3 2053 bool is_exec = parameters->options().output_is_executable();
edfbb029 2054 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 2055 Symbol_table::PREDEFINED,
edfbb029
CC		 2056 tls_segment, 0, 0,
2057 elfcpp::STT_TLS,
2058 elfcpp::STB_LOCAL,
2059 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 2060 (is_exec
2061 ? Symbol::SEGMENT_END
2062 : Symbol::SEGMENT_START),
2063 true);
edfbb029
CC		 2064 }
2065 this->tls_base_symbol_defined_ = true;
2066}
2067
c2b45e22
CC		 2068// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
2069
fc51264f 2070template<int size>
c2b45e22 2071void
fc51264f 2072Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab,
2e702c99 2073 Layout* layout)
c2b45e22
CC		 2074{
2075 if (this->plt_ == NULL)
2076 this->make_plt_section(symtab, layout);
2077
2078 if (!this->plt_->has_tlsdesc_entry())
2079 {
2080 // Allocate the TLSDESC_GOT entry.
2081 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2082 unsigned int got_offset = got->add_constant(0);
2083
2084 // Allocate the TLSDESC_PLT entry.
2085 this->plt_->reserve_tlsdesc_entry(got_offset);
2086 }
2087}
2088
31d60480
ILT		 2089// Create a GOT entry for the TLS module index.
2090
fc51264f 2091template<int size>
31d60480 2092unsigned int
fc51264f
L		 2093Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
2094 Sized_relobj_file<size, false>* object)
31d60480
ILT		 2095{
2096 if (this->got_mod_index_offset_ == -1U)
2097 {
2098 gold_assert(symtab != NULL && layout != NULL && object != NULL);
2099 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
2100 Output_data_got<64, false>* got = this->got_section(symtab, layout);
2101 unsigned int got_offset = got->add_constant(0);
2102 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
2e702c99 2103 got_offset, 0);
009a67a2 2104 got->add_constant(0);
31d60480
ILT		 2105 this->got_mod_index_offset_ = got_offset;
2106 }
2107 return this->got_mod_index_offset_;
2108}
2109
2e30d253
ILT		 2110// Optimize the TLS relocation type based on what we know about the
2111// symbol. IS_FINAL is true if the final address of this symbol is
2112// known at link time.
2113
fc51264f 2114template<int size>
e041f13d 2115tls::Tls_optimization
fc51264f 2116Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type)
2e30d253 2117{
2e30d253
ILT		 2118 // If we are generating a shared library, then we can't do anything
2119 // in the linker.
8851ecca 2120 if (parameters->options().shared())
e041f13d 2121 return tls::TLSOPT_NONE;
2e30d253
ILT		 2122
2123 switch (r_type)
2124 {
2125 case elfcpp::R_X86_64_TLSGD:
e041f13d
ILT		 2126 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2127 case elfcpp::R_X86_64_TLSDESC_CALL:
2128 // These are General-Dynamic which permits fully general TLS
2e30d253
ILT		 2129 // access. Since we know that we are generating an executable,
2130 // we can convert this to Initial-Exec. If we also know that
2131 // this is a local symbol, we can further switch to Local-Exec.
2132 if (is_final)
e041f13d
ILT		 2133 return tls::TLSOPT_TO_LE;
2134 return tls::TLSOPT_TO_IE;
2e30d253 2135
d61c17ea 2136 case elfcpp::R_X86_64_TLSLD:
2e30d253
ILT		 2137 // This is Local-Dynamic, which refers to a local symbol in the
2138 // dynamic TLS block. Since we know that we generating an
2139 // executable, we can switch to Local-Exec.
e041f13d 2140 return tls::TLSOPT_TO_LE;
2e30d253 2141
0ffd9845 2142 case elfcpp::R_X86_64_DTPOFF32:
0ffd9845
ILT		 2143 case elfcpp::R_X86_64_DTPOFF64:
2144 // Another Local-Dynamic reloc.
e041f13d 2145 return tls::TLSOPT_TO_LE;
0ffd9845 2146
d61c17ea 2147 case elfcpp::R_X86_64_GOTTPOFF:
2e30d253
ILT		 2148 // These are Initial-Exec relocs which get the thread offset
2149 // from the GOT. If we know that we are linking against the
2150 // local symbol, we can switch to Local-Exec, which links the
2151 // thread offset into the instruction.
2152 if (is_final)
e041f13d
ILT		 2153 return tls::TLSOPT_TO_LE;
2154 return tls::TLSOPT_NONE;
2e30d253 2155
d61c17ea 2156 case elfcpp::R_X86_64_TPOFF32:
2e30d253
ILT		 2157 // When we already have Local-Exec, there is nothing further we
2158 // can do.
e041f13d 2159 return tls::TLSOPT_NONE;
2e30d253
ILT		 2160
2161 default:
2162 gold_unreachable();
2163 }
2e30d253
ILT		 2164}
2165
95a2c8d6
RS		 2166// Get the Reference_flags for a particular relocation.
2167
fc51264f 2168template<int size>
95a2c8d6 2169int
fc51264f 2170Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type)
95a2c8d6
RS		 2171{
2172 switch (r_type)
2173 {
2174 case elfcpp::R_X86_64_NONE:
2175 case elfcpp::R_X86_64_GNU_VTINHERIT:
2176 case elfcpp::R_X86_64_GNU_VTENTRY:
2177 case elfcpp::R_X86_64_GOTPC32:
2178 case elfcpp::R_X86_64_GOTPC64:
2179 // No symbol reference.
2180 return 0;
2181
2182 case elfcpp::R_X86_64_64:
2183 case elfcpp::R_X86_64_32:
2184 case elfcpp::R_X86_64_32S:
2185 case elfcpp::R_X86_64_16:
2186 case elfcpp::R_X86_64_8:
2187 return Symbol::ABSOLUTE_REF;
2188
2189 case elfcpp::R_X86_64_PC64:
2190 case elfcpp::R_X86_64_PC32:
f49fe902 2191 case elfcpp::R_X86_64_PC32_BND:
95a2c8d6
RS		 2192 case elfcpp::R_X86_64_PC16:
2193 case elfcpp::R_X86_64_PC8:
2194 case elfcpp::R_X86_64_GOTOFF64:
2195 return Symbol::RELATIVE_REF;
2196
2197 case elfcpp::R_X86_64_PLT32:
f49fe902 2198 case elfcpp::R_X86_64_PLT32_BND:
95a2c8d6
RS		 2199 case elfcpp::R_X86_64_PLTOFF64:
2200 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
2201
2202 case elfcpp::R_X86_64_GOT64:
2203 case elfcpp::R_X86_64_GOT32:
2204 case elfcpp::R_X86_64_GOTPCREL64:
2205 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2206 case elfcpp::R_X86_64_GOTPCRELX:
2207 case elfcpp::R_X86_64_REX_GOTPCRELX:
95a2c8d6
RS		 2208 case elfcpp::R_X86_64_GOTPLT64:
2209 // Absolute in GOT.
2210 return Symbol::ABSOLUTE_REF;
2211
2212 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2213 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2214 case elfcpp::R_X86_64_TLSDESC_CALL:
2215 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2216 case elfcpp::R_X86_64_DTPOFF32:
2217 case elfcpp::R_X86_64_DTPOFF64:
2218 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2219 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2220 return Symbol::TLS_REF;
2221
2222 case elfcpp::R_X86_64_COPY:
2223 case elfcpp::R_X86_64_GLOB_DAT:
2224 case elfcpp::R_X86_64_JUMP_SLOT:
2225 case elfcpp::R_X86_64_RELATIVE:
2226 case elfcpp::R_X86_64_IRELATIVE:
2227 case elfcpp::R_X86_64_TPOFF64:
2228 case elfcpp::R_X86_64_DTPMOD64:
2229 case elfcpp::R_X86_64_TLSDESC:
2230 case elfcpp::R_X86_64_SIZE32:
2231 case elfcpp::R_X86_64_SIZE64:
2232 default:
2233 // Not expected. We will give an error later.
2234 return 0;
2235 }
2236}
2237
e041f13d
ILT		 2238// Report an unsupported relocation against a local symbol.
2239
fc51264f 2240template<int size>
e041f13d 2241void
fc51264f
L		 2242Target_x86_64<size>::Scan::unsupported_reloc_local(
2243 Sized_relobj_file<size, false>* object,
6fa2a40b 2244 unsigned int r_type)
e041f13d 2245{
75f2446e
ILT		 2246 gold_error(_("%s: unsupported reloc %u against local symbol"),
2247 object->name().c_str(), r_type);
e041f13d
ILT		 2248}
2249
a036edd8
ILT		 2250// We are about to emit a dynamic relocation of type R_TYPE. If the
2251// dynamic linker does not support it, issue an error. The GNU linker
2252// only issues a non-PIC error for an allocated read-only section.
2253// Here we know the section is allocated, but we don't know that it is
2254// read-only. But we check for all the relocation types which the
2255// glibc dynamic linker supports, so it seems appropriate to issue an
a29b0dad
ILT		 2256// error even if the section is not read-only. If GSYM is not NULL,
2257// it is the symbol the relocation is against; if it is NULL, the
2258// relocation is against a local symbol.
a036edd8 2259
fc51264f 2260template<int size>
a036edd8 2261void
fc51264f
L		 2262Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type,
2263 Symbol* gsym)
a036edd8
ILT		 2264{
2265 switch (r_type)
2266 {
2fbb4320
ILT		 2267 // These are the relocation types supported by glibc for x86_64
2268 // which should always work.
a036edd8 2269 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2270 case elfcpp::R_X86_64_IRELATIVE:
a036edd8
ILT		 2271 case elfcpp::R_X86_64_GLOB_DAT:
2272 case elfcpp::R_X86_64_JUMP_SLOT:
2273 case elfcpp::R_X86_64_DTPMOD64:
2274 case elfcpp::R_X86_64_DTPOFF64:
2275 case elfcpp::R_X86_64_TPOFF64:
2276 case elfcpp::R_X86_64_64:
2fbb4320
ILT		 2277 case elfcpp::R_X86_64_COPY:
2278 return;
2279
2280 // glibc supports these reloc types, but they can overflow.
a036edd8 2281 case elfcpp::R_X86_64_PC32:
f49fe902 2282 case elfcpp::R_X86_64_PC32_BND:
a29b0dad
ILT		 2283 // A PC relative reference is OK against a local symbol or if
2284 // the symbol is defined locally.
2285 if (gsym == NULL
2286 || (!gsym->is_from_dynobj()
2287 && !gsym->is_undefined()
2288 && !gsym->is_preemptible()))
2289 return;
2290 /* Fall through. */
2291 case elfcpp::R_X86_64_32:
3660ff06
L		 2292 // R_X86_64_32 is OK for x32.
2293 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2294 return;
2fbb4320
ILT		 2295 if (this->issued_non_pic_error_)
2296 return;
2297 gold_assert(parameters->options().output_is_position_independent());
a29b0dad
ILT		 2298 if (gsym == NULL)
2299 object->error(_("requires dynamic R_X86_64_32 reloc which may "
2300 "overflow at runtime; recompile with -fPIC"));
2301 else
f49fe902
L		 2302 {
2303 const char *r_name;
2304 switch (r_type)
2305 {
2306 case elfcpp::R_X86_64_32:
2307 r_name = "R_X86_64_32";
2308 break;
2309 case elfcpp::R_X86_64_PC32:
2310 r_name = "R_X86_64_PC32";
2311 break;
2312 case elfcpp::R_X86_64_PC32_BND:
2313 r_name = "R_X86_64_PC32_BND";
2314 break;
2315 default:
2316 gold_unreachable();
2317 break;
2318 }
2319 object->error(_("requires dynamic %s reloc against '%s' "
2320 "which may overflow at runtime; recompile "
2321 "with -fPIC"),
2322 r_name, gsym->name());
2323 }
2fbb4320 2324 this->issued_non_pic_error_ = true;
a036edd8
ILT		 2325 return;
2326
2327 default:
2328 // This prevents us from issuing more than one error per reloc
2329 // section. But we can still wind up issuing more than one
2330 // error per object file.
2331 if (this->issued_non_pic_error_)
2e702c99 2332 return;
33aea2fd 2333 gold_assert(parameters->options().output_is_position_independent());
a29b0dad 2334 object->error(_("requires unsupported dynamic reloc %u; "
2e702c99 2335 "recompile with -fPIC"),
a29b0dad 2336 r_type);
a036edd8
ILT		 2337 this->issued_non_pic_error_ = true;
2338 return;
2339
2340 case elfcpp::R_X86_64_NONE:
2341 gold_unreachable();
2342 }
2343}
2344
7223e9ca
ILT		 2345// Return whether we need to make a PLT entry for a relocation of the
2346// given type against a STT_GNU_IFUNC symbol.
2347
fc51264f 2348template<int size>
7223e9ca 2349bool
fc51264f
L		 2350Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc(
2351 Sized_relobj_file<size, false>* object,
6fa2a40b 2352 unsigned int r_type)
7223e9ca 2353{
95a2c8d6
RS		 2354 int flags = Scan::get_reference_flags(r_type);
2355 if (flags & Symbol::TLS_REF)
2356 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
2e702c99 2357 object->name().c_str(), r_type);
95a2c8d6 2358 return flags != 0;
7223e9ca
ILT		 2359}
2360
2e30d253
ILT		 2361// Scan a relocation for a local symbol.
2362
fc51264f 2363template<int size>
2e30d253 2364inline void
fc51264f
L		 2365Target_x86_64<size>::Scan::local(Symbol_table* symtab,
2366 Layout* layout,
2367 Target_x86_64<size>* target,
2368 Sized_relobj_file<size, false>* object,
2369 unsigned int data_shndx,
2370 Output_section* output_section,
2371 const elfcpp::Rela<size, false>& reloc,
2372 unsigned int r_type,
bfdfa4cd
AM		 2373 const elfcpp::Sym<size, false>& lsym,
2374 bool is_discarded)
2e30d253 2375{
bfdfa4cd
AM		 2376 if (is_discarded)
2377 return;
2378
7223e9ca 2379 // A local STT_GNU_IFUNC symbol may require a PLT entry.
397b129b
CC		 2380 bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC;
2381 if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type))
7223e9ca 2382 {
fc51264f 2383 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 2384 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
2385 }
2386
2e30d253
ILT		 2387 switch (r_type)
2388 {
2389 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 2390 case elfcpp::R_X86_64_GNU_VTINHERIT:
2391 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 2392 break;
2393
2394 case elfcpp::R_X86_64_64:
d61c6bd4 2395 // If building a shared library (or a position-independent
dceae3c1
ILT		 2396 // executable), we need to create a dynamic relocation for this
2397 // location. The relocation applied at link time will apply the
2398 // link-time value, so we flag the location with an
2399 // R_X86_64_RELATIVE relocation so the dynamic loader can
d61c6bd4 2400 // relocate it easily.
8851ecca 2401 if (parameters->options().output_is_position_independent())
2e702c99
RM		 2402 {
2403 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2404 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca 2405 rela_dyn->add_local_relative(object, r_sym,
62fe925a 2406 (size == 32
fd885f3a
L		 2407 ? elfcpp::R_X86_64_RELATIVE64
2408 : elfcpp::R_X86_64_RELATIVE),
7223e9ca
ILT		 2409 output_section, data_shndx,
2410 reloc.get_r_offset(),
397b129b 2411 reloc.get_r_addend(), is_ifunc);
2e702c99 2412 }
d61c6bd4
ILT		 2413 break;
2414
2e30d253
ILT		 2415 case elfcpp::R_X86_64_32:
2416 case elfcpp::R_X86_64_32S:
2417 case elfcpp::R_X86_64_16:
2418 case elfcpp::R_X86_64_8:
96f2030e 2419 // If building a shared library (or a position-independent
dceae3c1
ILT		 2420 // executable), we need to create a dynamic relocation for this
2421 // location. We can't use an R_X86_64_RELATIVE relocation
2422 // because that is always a 64-bit relocation.
8851ecca 2423 if (parameters->options().output_is_position_independent())
2e702c99 2424 {
3660ff06
L		 2425 // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32.
2426 if (size == 32 && r_type == elfcpp::R_X86_64_32)
2427 {
2428 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2429 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2430 rela_dyn->add_local_relative(object, r_sym,
2431 elfcpp::R_X86_64_RELATIVE,
2432 output_section, data_shndx,
2433 reloc.get_r_offset(),
2434 reloc.get_r_addend(), is_ifunc);
2435 break;
2436 }
2437
2e702c99 2438 this->check_non_pic(object, r_type, NULL);
a036edd8 2439
2e702c99 2440 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
fc51264f 2441 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2e702c99 2442 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 2443 rela_dyn->add_local(object, r_sym, r_type, output_section,
2444 data_shndx, reloc.get_r_offset(),
2445 reloc.get_r_addend());
2e702c99
RM		 2446 else
2447 {
2448 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 2449 unsigned int shndx = lsym.get_st_shndx();
2450 bool is_ordinary;
2451 shndx = object->adjust_sym_shndx(r_sym, shndx,
2452 &is_ordinary);
2453 if (!is_ordinary)
2454 object->error(_("section symbol %u has bad shndx %u"),
2455 r_sym, shndx);
2456 else
2457 rela_dyn->add_local_section(object, shndx,
2458 r_type, output_section,
2459 data_shndx, reloc.get_r_offset(),
2460 reloc.get_r_addend());
2e702c99
RM		 2461 }
2462 }
2e30d253
ILT		 2463 break;
2464
2465 case elfcpp::R_X86_64_PC64:
2466 case elfcpp::R_X86_64_PC32:
f49fe902 2467 case elfcpp::R_X86_64_PC32_BND:
2e30d253
ILT		 2468 case elfcpp::R_X86_64_PC16:
2469 case elfcpp::R_X86_64_PC8:
2470 break;
2471
f389a824 2472 case elfcpp::R_X86_64_PLT32:
f49fe902 2473 case elfcpp::R_X86_64_PLT32_BND:
f389a824
ILT		 2474 // Since we know this is a local symbol, we can handle this as a
2475 // PC32 reloc.
2476 break;
2477
fdc2f80f 2478 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 2479 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 2480 case elfcpp::R_X86_64_GOTPC64:
2481 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 2482 // We need a GOT section.
2483 target->got_section(symtab, layout);
ee9e9e86
ILT		 2484 // For PLTOFF64, we'd normally want a PLT section, but since we
2485 // know this is a local symbol, no PLT is needed.
2e30d253
ILT		 2486 break;
2487
0ffd9845
ILT		 2488 case elfcpp::R_X86_64_GOT64:
2489 case elfcpp::R_X86_64_GOT32:
2490 case elfcpp::R_X86_64_GOTPCREL64:
2491 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2492 case elfcpp::R_X86_64_GOTPCRELX:
2493 case elfcpp::R_X86_64_REX_GOTPCRELX:
ee9e9e86 2494 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845 2495 {
1fa29f10 2496 // The symbol requires a GOT section.
2e702c99 2497 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 2498
2499 // If the relocation symbol isn't IFUNC,
2500 // and is local, then we will convert
2501 // mov foo@GOTPCREL(%rip), %reg
2502 // to lea foo(%rip), %reg.
2503 // in Relocate::relocate.
2891b491
L		 2504 if ((r_type == elfcpp::R_X86_64_GOTPCREL
2505 || r_type == elfcpp::R_X86_64_GOTPCRELX
2506 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
1fa29f10
IT		 2507 && reloc.get_r_offset() >= 2
2508 && !is_ifunc)
2509 {
2510 section_size_type stype;
2511 const unsigned char* view = object->section_contents(data_shndx,
2512 &stype, true);
2513 if (view[reloc.get_r_offset() - 2] == 0x8b)
2514 break;
2515 }
2516
2517
2518 // The symbol requires a GOT entry.
2e702c99 2519 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
7223e9ca
ILT		 2520
2521 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
2522 // lets function pointers compare correctly with shared
2523 // libraries. Otherwise we would need an IRELATIVE reloc.
2524 bool is_new;
397b129b 2525 if (is_ifunc)
7223e9ca
ILT		 2526 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
2527 else
2528 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
2e702c99
RM		 2529 if (is_new)
2530 {
2531 // If we are generating a shared object, we need to add a
2532 // dynamic relocation for this symbol's GOT entry.
2533 if (parameters->options().output_is_position_independent())
2534 {
2535 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7bf1f802
ILT		 2536 // R_X86_64_RELATIVE assumes a 64-bit relocation.
2537 if (r_type != elfcpp::R_X86_64_GOT32)
7223e9ca
ILT		 2538 {
2539 unsigned int got_offset =
2540 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
2541 rela_dyn->add_local_relative(object, r_sym,
2542 elfcpp::R_X86_64_RELATIVE,
397b129b 2543 got, got_offset, 0, is_ifunc);
7223e9ca 2544 }
2e702c99
RM		 2545 else
2546 {
2547 this->check_non_pic(object, r_type, NULL);
2548
2549 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
2550 rela_dyn->add_local(
2551 object, r_sym, r_type, got,
2552 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
2553 }
2554 }
2555 }
2556 // For GOTPLT64, we'd normally want a PLT section, but since
2557 // we know this is a local symbol, no PLT is needed.
0ffd9845
ILT		 2558 }
2559 break;
2560
2e30d253
ILT		 2561 case elfcpp::R_X86_64_COPY:
2562 case elfcpp::R_X86_64_GLOB_DAT:
2563 case elfcpp::R_X86_64_JUMP_SLOT:
2564 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 2565 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 2566 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 2567 case elfcpp::R_X86_64_TPOFF64:
2e30d253 2568 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 2569 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 2570 gold_error(_("%s: unexpected reloc %u in object file"),
2571 object->name().c_str(), r_type);
2e30d253
ILT		 2572 break;
2573
d61c17ea 2574 // These are initial tls relocs, which are expected when linking
56622147
ILT		 2575 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2576 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 2577 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 2578 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 2579 case elfcpp::R_X86_64_DTPOFF32:
2580 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 2581 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2582 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 2583 {
8851ecca 2584 bool output_is_shared = parameters->options().shared();
e041f13d 2585 const tls::Tls_optimization optimized_type
2e702c99 2586 = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared,
fc51264f 2587 r_type);
2e30d253
ILT		 2588 switch (r_type)
2589 {
2e702c99
RM		 2590 case elfcpp::R_X86_64_TLSGD: // General-dynamic
2591 if (optimized_type == tls::TLSOPT_NONE)
2592 {
2593 // Create a pair of GOT entries for the module index and
2594 // dtv-relative offset.
2595 Output_data_got<64, false>* got
2596 = target->got_section(symtab, layout);
2597 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
d491d34e
ILT		 2598 unsigned int shndx = lsym.get_st_shndx();
2599 bool is_ordinary;
2600 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
2601 if (!is_ordinary)
2602 object->error(_("local symbol %u has bad shndx %u"),
2603 r_sym, shndx);
2e702c99 2604 else
83896202
ILT		 2605 got->add_local_pair_with_rel(object, r_sym,
2606 shndx,
2607 GOT_TYPE_TLS_PAIR,
2608 target->rela_dyn_section(layout),
bd73a62d 2609 elfcpp::R_X86_64_DTPMOD64);
2e702c99
RM		 2610 }
2611 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 2612 unsupported_reloc_local(object, r_type);
2e702c99 2613 break;
7bf1f802 2614
2e702c99
RM		 2615 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
2616 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 2617 if (optimized_type == tls::TLSOPT_NONE)
2618 {
2e702c99
RM		 2619 // Create reserved PLT and GOT entries for the resolver.
2620 target->reserve_tlsdesc_entries(symtab, layout);
2621
2622 // Generate a double GOT entry with an
2623 // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc
2624 // is resolved lazily, so the GOT entry needs to be in
2625 // an area in .got.plt, not .got. Call got_section to
2626 // make sure the section has been created.
a8df5856 2627 target->got_section(symtab, layout);
2e702c99
RM		 2628 Output_data_got<64, false>* got = target->got_tlsdesc_section();
2629 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
e291e7b9
ILT		 2630 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
2631 {
2632 unsigned int got_offset = got->add_constant(0);
2633 got->add_constant(0);
2634 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
2635 got_offset);
2636 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2637 // We store the arguments we need in a vector, and
2638 // use the index into the vector as the parameter
2639 // to pass to the target specific routines.
2640 uintptr_t intarg = target->add_tlsdesc_info(object, r_sym);
2641 void* arg = reinterpret_cast<void*>(intarg);
2642 rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg,
2643 got, got_offset, 0);
2644 }
c2b45e22
CC		 2645 }
2646 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 2647 unsupported_reloc_local(object, r_type);
2e30d253
ILT		 2648 break;
2649
2e702c99 2650 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 2651 break;
2652
2e702c99 2653 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 2654 if (optimized_type == tls::TLSOPT_NONE)
2655 {
2e702c99
RM		 2656 // Create a GOT entry for the module index.
2657 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 2658 }
2659 else if (optimized_type != tls::TLSOPT_TO_LE)
2660 unsupported_reloc_local(object, r_type);
2661 break;
2662
2e702c99
RM		 2663 case elfcpp::R_X86_64_DTPOFF32:
2664 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 2665 break;
2666
2e702c99 2667 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 2668 layout->set_has_static_tls();
2e702c99
RM		 2669 if (optimized_type == tls::TLSOPT_NONE)
2670 {
2671 // Create a GOT entry for the tp-relative offset.
2672 Output_data_got<64, false>* got
2673 = target->got_section(symtab, layout);
2674 unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info());
2675 got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 2676 target->rela_dyn_section(layout),
2677 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 2678 }
2679 else if (optimized_type != tls::TLSOPT_TO_LE)
2680 unsupported_reloc_local(object, r_type);
2681 break;
0ffd9845 2682
2e702c99 2683 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 2684 layout->set_has_static_tls();
2e702c99
RM		 2685 if (output_is_shared)
2686 unsupported_reloc_local(object, r_type);
2e30d253 2687 break;
e041f13d 2688
2e702c99
RM		 2689 default:
2690 gold_unreachable();
2e30d253
ILT		 2691 }
2692 }
2693 break;
2e30d253 2694
fdc2f80f
ILT		 2695 case elfcpp::R_X86_64_SIZE32:
2696 case elfcpp::R_X86_64_SIZE64:
2e30d253 2697 default:
75f2446e
ILT		 2698 gold_error(_("%s: unsupported reloc %u against local symbol"),
2699 object->name().c_str(), r_type);
2e30d253
ILT		 2700 break;
2701 }
2702}
2703
2704
e041f13d
ILT		 2705// Report an unsupported relocation against a global symbol.
2706
fc51264f 2707template<int size>
e041f13d 2708void
fc51264f
L		 2709Target_x86_64<size>::Scan::unsupported_reloc_global(
2710 Sized_relobj_file<size, false>* object,
6fa2a40b
CC		 2711 unsigned int r_type,
2712 Symbol* gsym)
e041f13d 2713{
75f2446e 2714 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 2715 object->name().c_str(), r_type, gsym->demangled_name().c_str());
e041f13d
ILT		 2716}
2717
ce97fa81 2718// Returns true if this relocation type could be that of a function pointer.
fc51264f 2719template<int size>
21bb3914 2720inline bool
fc51264f 2721Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type)
21bb3914 2722{
21bb3914
ST		 2723 switch (r_type)
2724 {
2725 case elfcpp::R_X86_64_64:
2726 case elfcpp::R_X86_64_32:
2727 case elfcpp::R_X86_64_32S:
2728 case elfcpp::R_X86_64_16:
2729 case elfcpp::R_X86_64_8:
ce97fa81
ST		 2730 case elfcpp::R_X86_64_GOT64:
2731 case elfcpp::R_X86_64_GOT32:
2732 case elfcpp::R_X86_64_GOTPCREL64:
2733 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2734 case elfcpp::R_X86_64_GOTPCRELX:
2735 case elfcpp::R_X86_64_REX_GOTPCRELX:
ce97fa81 2736 case elfcpp::R_X86_64_GOTPLT64:
21bb3914 2737 {
2e702c99 2738 return true;
21bb3914
ST		 2739 }
2740 }
2741 return false;
2742}
2743
2744// For safe ICF, scan a relocation for a local symbol to check if it
2745// corresponds to a function pointer being taken. In that case mark
2746// the function whose pointer was taken as not foldable.
2747
fc51264f 2748template<int size>
21bb3914 2749inline bool
fc51264f 2750Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer(
21bb3914
ST		 2751 Symbol_table* ,
2752 Layout* ,
fc51264f
L		 2753 Target_x86_64<size>* ,
2754 Sized_relobj_file<size, false>* ,
21bb3914
ST		 2755 unsigned int ,
2756 Output_section* ,
fc51264f 2757 const elfcpp::Rela<size, false>& ,
21bb3914 2758 unsigned int r_type,
fc51264f 2759 const elfcpp::Sym<size, false>&)
21bb3914
ST		 2760{
2761 // When building a shared library, do not fold any local symbols as it is
2762 // not possible to distinguish pointer taken versus a call by looking at
2763 // the relocation types.
2764 return (parameters->options().shared()
2e702c99 2765 || possible_function_pointer_reloc(r_type));
21bb3914
ST		 2766}
2767
2768// For safe ICF, scan a relocation for a global symbol to check if it
2769// corresponds to a function pointer being taken. In that case mark
2770// the function whose pointer was taken as not foldable.
2771
fc51264f 2772template<int size>
21bb3914 2773inline bool
fc51264f 2774Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer(
21bb3914
ST		 2775 Symbol_table*,
2776 Layout* ,
fc51264f
L		 2777 Target_x86_64<size>* ,
2778 Sized_relobj_file<size, false>* ,
21bb3914
ST		 2779 unsigned int ,
2780 Output_section* ,
fc51264f 2781 const elfcpp::Rela<size, false>& ,
21bb3914
ST		 2782 unsigned int r_type,
2783 Symbol* gsym)
2784{
2785 // When building a shared library, do not fold symbols whose visibility
2786 // is hidden, internal or protected.
2787 return ((parameters->options().shared()
2e702c99 2788 && (gsym->visibility() == elfcpp::STV_INTERNAL
21bb3914
ST		 2789 || gsym->visibility() == elfcpp::STV_PROTECTED
2790 || gsym->visibility() == elfcpp::STV_HIDDEN))
2e702c99 2791 || possible_function_pointer_reloc(r_type));
21bb3914
ST		 2792}
2793
2e30d253
ILT		 2794// Scan a relocation for a global symbol.
2795
fc51264f 2796template<int size>
2e30d253 2797inline void
fc51264f 2798Target_x86_64<size>::Scan::global(Symbol_table* symtab,
2e702c99
RM		 2799 Layout* layout,
2800 Target_x86_64<size>* target,
2801 Sized_relobj_file<size, false>* object,
2802 unsigned int data_shndx,
2803 Output_section* output_section,
2804 const elfcpp::Rela<size, false>& reloc,
2805 unsigned int r_type,
2806 Symbol* gsym)
2e30d253 2807{
7223e9ca
ILT		 2808 // A STT_GNU_IFUNC symbol may require a PLT entry.
2809 if (gsym->type() == elfcpp::STT_GNU_IFUNC
2810 && this->reloc_needs_plt_for_ifunc(object, r_type))
2811 target->make_plt_entry(symtab, layout, gsym);
2812
2e30d253
ILT		 2813 switch (r_type)
2814 {
2815 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 2816 case elfcpp::R_X86_64_GNU_VTINHERIT:
2817 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 2818 break;
2819
2820 case elfcpp::R_X86_64_64:
2e30d253
ILT		 2821 case elfcpp::R_X86_64_32:
2822 case elfcpp::R_X86_64_32S:
2e30d253 2823 case elfcpp::R_X86_64_16:
2e30d253 2824 case elfcpp::R_X86_64_8:
96f2030e 2825 {
2e702c99
RM		 2826 // Make a PLT entry if necessary.
2827 if (gsym->needs_plt_entry())
2828 {
2829 target->make_plt_entry(symtab, layout, gsym);
2830 // Since this is not a PC-relative relocation, we may be
2831 // taking the address of a function. In that case we need to
2832 // set the entry in the dynamic symbol table to the address of
2833 // the PLT entry.
2834 if (gsym->is_from_dynobj() && !parameters->options().shared())
2835 gsym->set_needs_dynsym_value();
2836 }
2837 // Make a dynamic relocation if necessary.
2838 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2839 {
a82bef93
ST		 2840 if (!parameters->options().output_is_position_independent()
2841 && gsym->may_need_copy_reloc())
2e702c99
RM		 2842 {
2843 target->copy_reloc(symtab, layout, object,
2844 data_shndx, output_section, gsym, reloc);
2845 }
1bae613c
L		 2846 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2847 || (size == 32 && r_type == elfcpp::R_X86_64_32))
7223e9ca
ILT		 2848 && gsym->type() == elfcpp::STT_GNU_IFUNC
2849 && gsym->can_use_relative_reloc(false)
2850 && !gsym->is_from_dynobj()
2851 && !gsym->is_undefined()
2852 && !gsym->is_preemptible())
2853 {
2854 // Use an IRELATIVE reloc for a locally defined
2855 // STT_GNU_IFUNC symbol. This makes a function
2856 // address in a PIE executable match the address in a
2857 // shared library that it links against.
67181c72
ILT		 2858 Reloc_section* rela_dyn =
2859 target->rela_irelative_section(layout);
7223e9ca
ILT		 2860 unsigned int r_type = elfcpp::R_X86_64_IRELATIVE;
2861 rela_dyn->add_symbolless_global_addend(gsym, r_type,
2862 output_section, object,
2863 data_shndx,
2864 reloc.get_r_offset(),
2865 reloc.get_r_addend());
2866 }
b14016f0
L		 2867 else if (((size == 64 && r_type == elfcpp::R_X86_64_64)
2868 || (size == 32 && r_type == elfcpp::R_X86_64_32))
2e702c99
RM		 2869 && gsym->can_use_relative_reloc(false))
2870 {
2871 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7223e9ca
ILT		 2872 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
2873 output_section, object,
2874 data_shndx,
2875 reloc.get_r_offset(),
13cf9988 2876 reloc.get_r_addend(), false);
2e702c99
RM		 2877 }
2878 else
2879 {
2880 this->check_non_pic(object, r_type, gsym);
2881 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2882 rela_dyn->add_global(gsym, r_type, output_section, object,
2883 data_shndx, reloc.get_r_offset(),
2884 reloc.get_r_addend());
2885 }
2886 }
d61c6bd4
ILT		 2887 }
2888 break;
2889
2890 case elfcpp::R_X86_64_PC64:
2891 case elfcpp::R_X86_64_PC32:
f49fe902 2892 case elfcpp::R_X86_64_PC32_BND:
d61c6bd4
ILT		 2893 case elfcpp::R_X86_64_PC16:
2894 case elfcpp::R_X86_64_PC8:
2895 {
2e702c99
RM		 2896 // Make a PLT entry if necessary.
2897 if (gsym->needs_plt_entry())
2898 target->make_plt_entry(symtab, layout, gsym);
2899 // Make a dynamic relocation if necessary.
2900 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
2901 {
a82bef93
ST		 2902 if (parameters->options().output_is_executable()
2903 && gsym->may_need_copy_reloc())
2e702c99
RM		 2904 {
2905 target->copy_reloc(symtab, layout, object,
2906 data_shndx, output_section, gsym, reloc);
2907 }
2908 else
2909 {
2910 this->check_non_pic(object, r_type, gsym);
2911 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
2912 rela_dyn->add_global(gsym, r_type, output_section, object,
2913 data_shndx, reloc.get_r_offset(),
2914 reloc.get_r_addend());
2915 }
2916 }
d61c6bd4 2917 }
2e30d253
ILT		 2918 break;
2919
ff006520 2920 case elfcpp::R_X86_64_GOT64:
2e30d253 2921 case elfcpp::R_X86_64_GOT32:
ff006520
ILT		 2922 case elfcpp::R_X86_64_GOTPCREL64:
2923 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 2924 case elfcpp::R_X86_64_GOTPCRELX:
2925 case elfcpp::R_X86_64_REX_GOTPCRELX:
ff006520 2926 case elfcpp::R_X86_64_GOTPLT64:
2e30d253 2927 {
2e702c99
RM		 2928 // The symbol requires a GOT entry.
2929 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1fa29f10
IT		 2930
2931 // If we convert this from
2932 // mov foo@GOTPCREL(%rip), %reg
2933 // to lea foo(%rip), %reg.
2934 // in Relocate::relocate, then there is nothing to do here.
2891b491
L		 2935 if ((r_type == elfcpp::R_X86_64_GOTPCREL
2936 || r_type == elfcpp::R_X86_64_GOTPCRELX
2937 || r_type == elfcpp::R_X86_64_REX_GOTPCRELX)
1fa29f10
IT		 2938 && reloc.get_r_offset() >= 2
2939 && Target_x86_64<size>::can_convert_mov_to_lea(gsym))
2940 {
2941 section_size_type stype;
2942 const unsigned char* view = object->section_contents(data_shndx,
2943 &stype, true);
2944 if (view[reloc.get_r_offset() - 2] == 0x8b)
2945 break;
2946 }
2947
2e702c99 2948 if (gsym->final_value_is_known())
7223e9ca
ILT		 2949 {
2950 // For a STT_GNU_IFUNC symbol we want the PLT address.
2951 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
2952 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2953 else
2954 got->add_global(gsym, GOT_TYPE_STANDARD);
2955 }
2e702c99
RM		 2956 else
2957 {
2958 // If this symbol is not fully resolved, we need to add a
2959 // dynamic relocation for it.
2960 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
07aa62f2
ILT		 2961
2962 // Use a GLOB_DAT rather than a RELATIVE reloc if:
2963 //
2964 // 1) The symbol may be defined in some other module.
2965 //
2966 // 2) We are building a shared library and this is a
2967 // protected symbol; using GLOB_DAT means that the dynamic
2968 // linker can use the address of the PLT in the main
2969 // executable when appropriate so that function address
2970 // comparisons work.
2971 //
2972 // 3) This is a STT_GNU_IFUNC symbol in position dependent
2973 // code, again so that function address comparisons work.
7223e9ca
ILT		 2974 if (gsym->is_from_dynobj()
2975 || gsym->is_undefined()
2976 || gsym->is_preemptible()
07aa62f2
ILT		 2977 || (gsym->visibility() == elfcpp::STV_PROTECTED
2978 && parameters->options().shared())
7223e9ca
ILT		 2979 || (gsym->type() == elfcpp::STT_GNU_IFUNC
2980 && parameters->options().output_is_position_independent()))
2e702c99 2981 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn,
83896202 2982 elfcpp::R_X86_64_GLOB_DAT);
2e702c99
RM		 2983 else
2984 {
7223e9ca
ILT		 2985 // For a STT_GNU_IFUNC symbol we want to write the PLT
2986 // offset into the GOT, so that function pointer
2987 // comparisons work correctly.
2988 bool is_new;
2989 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
2990 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
2991 else
2992 {
2993 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
2994 // Tell the dynamic linker to use the PLT address
2995 // when resolving relocations.
2996 if (gsym->is_from_dynobj()
2997 && !parameters->options().shared())
2998 gsym->set_needs_dynsym_value();
2999 }
2e702c99 3000 if (is_new)
7223e9ca
ILT		 3001 {
3002 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
3003 rela_dyn->add_global_relative(gsym,
3004 elfcpp::R_X86_64_RELATIVE,
13cf9988 3005 got, got_off, 0, false);
7223e9ca 3006 }
2e702c99
RM		 3007 }
3008 }
2e30d253
ILT		 3009 }
3010 break;
3011
3012 case elfcpp::R_X86_64_PLT32:
f49fe902 3013 case elfcpp::R_X86_64_PLT32_BND:
2e30d253
ILT		 3014 // If the symbol is fully resolved, this is just a PC32 reloc.
3015 // Otherwise we need a PLT entry.
3016 if (gsym->final_value_is_known())
3017 break;
96f2030e
ILT		 3018 // If building a shared library, we can also skip the PLT entry
3019 // if the symbol is defined in the output file and is protected
3020 // or hidden.
3021 if (gsym->is_defined()
2e702c99
RM		 3022 && !gsym->is_from_dynobj()
3023 && !gsym->is_preemptible())
96f2030e 3024 break;
2e30d253
ILT		 3025 target->make_plt_entry(symtab, layout, gsym);
3026 break;
3027
fdc2f80f 3028 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 3029 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 3030 case elfcpp::R_X86_64_GOTPC64:
3031 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 3032 // We need a GOT section.
3033 target->got_section(symtab, layout);
ee9e9e86
ILT		 3034 // For PLTOFF64, we also need a PLT entry (but only if the
3035 // symbol is not fully resolved).
3036 if (r_type == elfcpp::R_X86_64_PLTOFF64
3037 && !gsym->final_value_is_known())
3038 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 3039 break;
3040
2e30d253
ILT		 3041 case elfcpp::R_X86_64_COPY:
3042 case elfcpp::R_X86_64_GLOB_DAT:
3043 case elfcpp::R_X86_64_JUMP_SLOT:
3044 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3045 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3046 // These are outstanding tls relocs, which are unexpected when linking
e822f2b1 3047 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3048 case elfcpp::R_X86_64_DTPMOD64:
e822f2b1 3049 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3050 gold_error(_("%s: unexpected reloc %u in object file"),
3051 object->name().c_str(), r_type);
2e30d253 3052 break;
2e30d253 3053
d61c17ea 3054 // These are initial tls relocs, which are expected for global()
56622147
ILT		 3055 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3056 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3057 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3058 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3059 case elfcpp::R_X86_64_DTPOFF32:
3060 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3061 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3062 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 3063 {
65d92137
CC		 3064 // For the Initial-Exec model, we can treat undef symbols as final
3065 // when building an executable.
3066 const bool is_final = (gsym->final_value_is_known() ||
3067 (r_type == elfcpp::R_X86_64_GOTTPOFF &&
3068 gsym->is_undefined() &&
3069 parameters->options().output_is_executable()));
e041f13d 3070 const tls::Tls_optimization optimized_type
2e702c99 3071 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 3072 switch (r_type)
3073 {
2e702c99 3074 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 3075 if (optimized_type == tls::TLSOPT_NONE)
3076 {
2e702c99
RM		 3077 // Create a pair of GOT entries for the module index and
3078 // dtv-relative offset.
3079 Output_data_got<64, false>* got
3080 = target->got_section(symtab, layout);
3081 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
83896202
ILT		 3082 target->rela_dyn_section(layout),
3083 elfcpp::R_X86_64_DTPMOD64,
3084 elfcpp::R_X86_64_DTPOFF64);
7bf1f802
ILT		 3085 }
3086 else if (optimized_type == tls::TLSOPT_TO_IE)
3087 {
2e702c99
RM		 3088 // Create a GOT entry for the tp-relative offset.
3089 Output_data_got<64, false>* got
3090 = target->got_section(symtab, layout);
3091 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3092 target->rela_dyn_section(layout),
3093 elfcpp::R_X86_64_TPOFF64);
7bf1f802
ILT		 3094 }
3095 else if (optimized_type != tls::TLSOPT_TO_LE)
3096 unsupported_reloc_global(object, r_type, gsym);
3097 break;
3098
2e702c99
RM		 3099 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
3100 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 3101 if (optimized_type == tls::TLSOPT_NONE)
3102 {
2e702c99
RM		 3103 // Create reserved PLT and GOT entries for the resolver.
3104 target->reserve_tlsdesc_entries(symtab, layout);
3105
3106 // Create a double GOT entry with an R_X86_64_TLSDESC
3107 // reloc. The R_X86_64_TLSDESC reloc is resolved
3108 // lazily, so the GOT entry needs to be in an area in
3109 // .got.plt, not .got. Call got_section to make sure
3110 // the section has been created.
a8df5856 3111 target->got_section(symtab, layout);
2e702c99 3112 Output_data_got<64, false>* got = target->got_tlsdesc_section();
ca09d69a 3113 Reloc_section* rt = target->rela_tlsdesc_section(layout);
2e702c99 3114 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
83896202 3115 elfcpp::R_X86_64_TLSDESC, 0);
c2b45e22
CC		 3116 }
3117 else if (optimized_type == tls::TLSOPT_TO_IE)
3118 {
2e702c99
RM		 3119 // Create a GOT entry for the tp-relative offset.
3120 Output_data_got<64, false>* got
3121 = target->got_section(symtab, layout);
3122 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3123 target->rela_dyn_section(layout),
3124 elfcpp::R_X86_64_TPOFF64);
c2b45e22
CC		 3125 }
3126 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 3127 unsupported_reloc_global(object, r_type, gsym);
2e30d253
ILT		 3128 break;
3129
2e702c99 3130 case elfcpp::R_X86_64_TLSDESC_CALL:
c2b45e22
CC		 3131 break;
3132
2e702c99 3133 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 3134 if (optimized_type == tls::TLSOPT_NONE)
3135 {
2e702c99
RM		 3136 // Create a GOT entry for the module index.
3137 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 3138 }
3139 else if (optimized_type != tls::TLSOPT_TO_LE)
3140 unsupported_reloc_global(object, r_type, gsym);
3141 break;
3142
2e702c99
RM		 3143 case elfcpp::R_X86_64_DTPOFF32:
3144 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 3145 break;
3146
2e702c99 3147 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 3148 layout->set_has_static_tls();
2e702c99
RM		 3149 if (optimized_type == tls::TLSOPT_NONE)
3150 {
3151 // Create a GOT entry for the tp-relative offset.
3152 Output_data_got<64, false>* got
3153 = target->got_section(symtab, layout);
3154 got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET,
83896202
ILT		 3155 target->rela_dyn_section(layout),
3156 elfcpp::R_X86_64_TPOFF64);
2e702c99
RM		 3157 }
3158 else if (optimized_type != tls::TLSOPT_TO_LE)
3159 unsupported_reloc_global(object, r_type, gsym);
3160 break;
0ffd9845 3161
2e702c99 3162 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 3163 layout->set_has_static_tls();
2e702c99 3164 if (parameters->options().shared())
b1759dce 3165 unsupported_reloc_global(object, r_type, gsym);
2e30d253 3166 break;
e041f13d 3167
2e702c99
RM		 3168 default:
3169 gold_unreachable();
2e30d253
ILT		 3170 }
3171 }
3172 break;
fdc2f80f
ILT		 3173
3174 case elfcpp::R_X86_64_SIZE32:
3175 case elfcpp::R_X86_64_SIZE64:
2e30d253 3176 default:
75f2446e 3177 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 3178 object->name().c_str(), r_type,
2e702c99 3179 gsym->demangled_name().c_str());
2e30d253
ILT		 3180 break;
3181 }
3182}
3183
fc51264f 3184template<int size>
6d03d481 3185void
fc51264f
L		 3186Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab,
3187 Layout* layout,
3188 Sized_relobj_file<size, false>* object,
3189 unsigned int data_shndx,
3190 unsigned int sh_type,
3191 const unsigned char* prelocs,
3192 size_t reloc_count,
3193 Output_section* output_section,
3194 bool needs_special_offset_handling,
3195 size_t local_symbol_count,
3196 const unsigned char* plocal_symbols)
6d03d481 3197{
4d625b70
CC		 3198 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
3199 Classify_reloc;
6d03d481
ST		 3200
3201 if (sh_type == elfcpp::SHT_REL)
3202 {
3203 return;
3204 }
3205
4d625b70
CC		 3206 gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan,
3207 Classify_reloc>(
6d03d481
ST		 3208 symtab,
3209 layout,
3210 this,
3211 object,
3212 data_shndx,
3213 prelocs,
3214 reloc_count,
3215 output_section,
3216 needs_special_offset_handling,
3217 local_symbol_count,
3218 plocal_symbols);
2e702c99 3219
6d03d481 3220}
2e30d253
ILT		 3221// Scan relocations for a section.
3222
fc51264f 3223template<int size>
2e30d253 3224void
fc51264f
L		 3225Target_x86_64<size>::scan_relocs(Symbol_table* symtab,
3226 Layout* layout,
3227 Sized_relobj_file<size, false>* object,
3228 unsigned int data_shndx,
3229 unsigned int sh_type,
3230 const unsigned char* prelocs,
3231 size_t reloc_count,
3232 Output_section* output_section,
3233 bool needs_special_offset_handling,
3234 size_t local_symbol_count,
3235 const unsigned char* plocal_symbols)
2e30d253 3236{
4d625b70
CC		 3237 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
3238 Classify_reloc;
3239
2e30d253
ILT		 3240 if (sh_type == elfcpp::SHT_REL)
3241 {
75f2446e
ILT		 3242 gold_error(_("%s: unsupported REL reloc section"),
3243 object->name().c_str());
3244 return;
2e30d253
ILT		 3245 }
3246
4d625b70 3247 gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>(
2e30d253
ILT		 3248 symtab,
3249 layout,
3250 this,
3251 object,
3252 data_shndx,
3253 prelocs,
3254 reloc_count,
730cdc88
ILT		 3255 output_section,
3256 needs_special_offset_handling,
2e30d253 3257 local_symbol_count,
730cdc88 3258 plocal_symbols);
2e30d253
ILT		 3259}
3260
3261// Finalize the sections.
3262
fc51264f 3263template<int size>
2e30d253 3264void
fc51264f 3265Target_x86_64<size>::do_finalize_sections(
f59f41f3
DK		 3266 Layout* layout,
3267 const Input_objects*,
e785ec03 3268 Symbol_table* symtab)
2e30d253 3269{
ea715a34
ILT		 3270 const Reloc_section* rel_plt = (this->plt_ == NULL
3271 ? NULL
e291e7b9 3272 : this->plt_->rela_plt());
ea715a34 3273 layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt,
612a8d3d 3274 this->rela_dyn_, true, false);
2e702c99 3275
2e30d253
ILT		 3276 // Fill in some more dynamic tags.
3277 Output_data_dynamic* const odyn = layout->dynamic_data();
3278 if (odyn != NULL)
3279 {
22b127cc 3280 if (this->plt_ != NULL
ea715a34
ILT		 3281 && this->plt_->output_section() != NULL
3282 && this->plt_->has_tlsdesc_entry())
2e30d253 3283 {
ea715a34
ILT		 3284 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
3285 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
3286 this->got_->finalize_data_size();
3287 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
3288 this->plt_, plt_offset);
3289 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
3290 this->got_, got_offset);
2e30d253
ILT		 3291 }
3292 }
3293
3294 // Emit any relocs we saved in an attempt to avoid generating COPY
3295 // relocs.
12c0daef
ILT		 3296 if (this->copy_relocs_.any_saved_relocs())
3297 this->copy_relocs_.emit(this->rela_dyn_section(layout));
e785ec03
ILT		 3298
3299 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
3300 // the .got.plt section.
3301 Symbol* sym = this->global_offset_table_;
3302 if (sym != NULL)
3303 {
3304 uint64_t data_size = this->got_plt_->current_data_size();
fc51264f 3305 symtab->get_sized_symbol<size>(sym)->set_symsize(data_size);
e785ec03 3306 }
28a13fec 3307
67181c72
ILT		 3308 if (parameters->doing_static_link()
3309 && (this->plt_ == NULL || !this->plt_->has_irelative_section()))
28a13fec
ILT		 3310 {
3311 // If linking statically, make sure that the __rela_iplt symbols
3312 // were defined if necessary, even if we didn't create a PLT.
3313 static const Define_symbol_in_segment syms[] =
3314 {
3315 {
3316 "__rela_iplt_start", // name
3317 elfcpp::PT_LOAD, // segment_type
3318 elfcpp::PF_W, // segment_flags_set
3319 elfcpp::PF(0), // segment_flags_clear
3320 0, // value
3321 0, // size
3322 elfcpp::STT_NOTYPE, // type
3323 elfcpp::STB_GLOBAL, // binding
3324 elfcpp::STV_HIDDEN, // visibility
3325 0, // nonvis
3326 Symbol::SEGMENT_START, // offset_from_base
3327 true // only_if_ref
3328 },
3329 {
3330 "__rela_iplt_end", // name
3331 elfcpp::PT_LOAD, // segment_type
3332 elfcpp::PF_W, // segment_flags_set
3333 elfcpp::PF(0), // segment_flags_clear
3334 0, // value
3335 0, // size
3336 elfcpp::STT_NOTYPE, // type
3337 elfcpp::STB_GLOBAL, // binding
3338 elfcpp::STV_HIDDEN, // visibility
3339 0, // nonvis
3340 Symbol::SEGMENT_START, // offset_from_base
3341 true // only_if_ref
3342 }
3343 };
3344
3345 symtab->define_symbols(layout, 2, syms,
3346 layout->script_options()->saw_sections_clause());
3347 }
2e30d253
ILT		 3348}
3349
19ef3f4d
CC		 3350// For x32, we need to handle PC-relative relocations using full 64-bit
3351// arithmetic, so that we can detect relocation overflows properly.
3352// This class overrides the pcrela32_check methods from the defaults in
3353// Relocate_functions in reloc.h.
3354
3355template<int size>
3356class X86_64_relocate_functions : public Relocate_functions<size, false>
3357{
3358 public:
3359 typedef Relocate_functions<size, false> Base;
3360
3361 // Do a simple PC relative relocation with the addend in the
3362 // relocation.
3363 static inline typename Base::Reloc_status
3364 pcrela32_check(unsigned char* view,
3365 typename elfcpp::Elf_types<64>::Elf_Addr value,
3366 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
3367 typename elfcpp::Elf_types<64>::Elf_Addr address)
3368 {
3369 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
3370 Valtype* wv = reinterpret_cast<Valtype*>(view);
3371 value = value + addend - address;
3372 elfcpp::Swap<32, false>::writeval(wv, value);
3373 return (Bits<32>::has_overflow(value)
3374 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
3375 }
3376
3377 // Do a simple PC relative relocation with a Symbol_value with the
3378 // addend in the relocation.
3379 static inline typename Base::Reloc_status
3380 pcrela32_check(unsigned char* view,
3381 const Sized_relobj_file<size, false>* object,
3382 const Symbol_value<size>* psymval,
3383 typename elfcpp::Elf_types<64>::Elf_Swxword addend,
3384 typename elfcpp::Elf_types<64>::Elf_Addr address)
3385 {
3386 typedef typename elfcpp::Swap<32, false>::Valtype Valtype;
3387 Valtype* wv = reinterpret_cast<Valtype*>(view);
3388 typename elfcpp::Elf_types<64>::Elf_Addr value =
3389 psymval->value(object, addend) - address;
3390 elfcpp::Swap<32, false>::writeval(wv, value);
3391 return (Bits<32>::has_overflow(value)
3392 ? Base::RELOC_OVERFLOW : Base::RELOC_OK);
3393 }
3394};
3395
2e30d253
ILT		 3396// Perform a relocation.
3397
fc51264f 3398template<int size>
2e30d253 3399inline bool
fc51264f
L		 3400Target_x86_64<size>::Relocate::relocate(
3401 const Relocate_info<size, false>* relinfo,
91a65d2f 3402 unsigned int,
fc51264f
L		 3403 Target_x86_64<size>* target,
3404 Output_section*,
3405 size_t relnum,
91a65d2f 3406 const unsigned char* preloc,
fc51264f
L		 3407 const Sized_symbol<size>* gsym,
3408 const Symbol_value<size>* psymval,
3409 unsigned char* view,
3410 typename elfcpp::Elf_types<size>::Elf_Addr address,
3411 section_size_type view_size)
2e30d253 3412{
19ef3f4d 3413 typedef X86_64_relocate_functions<size> Reloc_funcs;
91a65d2f
AM		 3414 const elfcpp::Rela<size, false> rela(preloc);
3415 unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info());
3416
2e30d253
ILT		 3417 if (this->skip_call_tls_get_addr_)
3418 {
5efc7cd2 3419 if ((r_type != elfcpp::R_X86_64_PLT32
f49fe902
L		 3420 && r_type != elfcpp::R_X86_64_PLT32_BND
3421 && r_type != elfcpp::R_X86_64_PC32_BND
2e702c99 3422 && r_type != elfcpp::R_X86_64_PC32)
2e30d253 3423 || gsym == NULL
0ffd9845 3424 || strcmp(gsym->name(), "__tls_get_addr") != 0)
2e30d253 3425 {
75f2446e
ILT		 3426 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3427 _("missing expected TLS relocation"));
3428 }
3429 else
3430 {
3431 this->skip_call_tls_get_addr_ = false;
3432 return false;
2e30d253 3433 }
2e30d253
ILT		 3434 }
3435
0e804863
ILT		 3436 if (view == NULL)
3437 return true;
3438
fc51264f 3439 const Sized_relobj_file<size, false>* object = relinfo->object;
7223e9ca
ILT		 3440
3441 // Pick the value to use for symbols defined in the PLT.
fc51264f 3442 Symbol_value<size> symval;
96f2030e 3443 if (gsym != NULL
95a2c8d6 3444 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
2e30d253 3445 {
19fec8c1 3446 symval.set_output_value(target->plt_address_for_global(gsym));
2e30d253
ILT		 3447 psymval = &symval;
3448 }
7223e9ca
ILT		 3449 else if (gsym == NULL && psymval->is_ifunc_symbol())
3450 {
fc51264f 3451 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
7223e9ca
ILT		 3452 if (object->local_has_plt_offset(r_sym))
3453 {
19fec8c1 3454 symval.set_output_value(target->plt_address_for_local(object, r_sym));
7223e9ca
ILT		 3455 psymval = &symval;
3456 }
3457 }
2e30d253 3458
0ffd9845
ILT		 3459 const elfcpp::Elf_Xword addend = rela.get_r_addend();
3460
3461 // Get the GOT offset if needed.
96f2030e
ILT		 3462 // The GOT pointer points to the end of the GOT section.
3463 // We need to subtract the size of the GOT section to get
3464 // the actual offset to use in the relocation.
0ffd9845 3465 bool have_got_offset = false;
c23dd342
L		 3466 // Since the actual offset is always negative, we use signed int to
3467 // support 64-bit GOT relocations.
3468 int got_offset = 0;
0ffd9845
ILT		 3469 switch (r_type)
3470 {
3471 case elfcpp::R_X86_64_GOT32:
3472 case elfcpp::R_X86_64_GOT64:
3473 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845
ILT		 3474 case elfcpp::R_X86_64_GOTPCREL64:
3475 if (gsym != NULL)
2e702c99
RM		 3476 {
3477 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3478 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3479 }
0ffd9845 3480 else
2e702c99
RM		 3481 {
3482 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3483 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3484 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3485 - target->got_size());
3486 }
0ffd9845
ILT		 3487 have_got_offset = true;
3488 break;
3489
3490 default:
3491 break;
3492 }
2e30d253 3493
c34c98ed
CC		 3494 typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK;
3495
2e30d253
ILT		 3496 switch (r_type)
3497 {
3498 case elfcpp::R_X86_64_NONE:
6e5710ce
ILT		 3499 case elfcpp::R_X86_64_GNU_VTINHERIT:
3500 case elfcpp::R_X86_64_GNU_VTENTRY:
2e30d253
ILT		 3501 break;
3502
3503 case elfcpp::R_X86_64_64:
c34c98ed 3504 Reloc_funcs::rela64(view, object, psymval, addend);
2e30d253
ILT		 3505 break;
3506
3507 case elfcpp::R_X86_64_PC64:
c34c98ed 3508 Reloc_funcs::pcrela64(view, object, psymval, addend,
2e702c99 3509 address);
2e30d253
ILT		 3510 break;
3511
3512 case elfcpp::R_X86_64_32:
c34c98ed
CC		 3513 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
3514 Reloc_funcs::CHECK_UNSIGNED);
2e30d253
ILT		 3515 break;
3516
3517 case elfcpp::R_X86_64_32S:
c34c98ed
CC		 3518 rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend,
3519 Reloc_funcs::CHECK_SIGNED);
2e30d253
ILT		 3520 break;
3521
3522 case elfcpp::R_X86_64_PC32:
f49fe902 3523 case elfcpp::R_X86_64_PC32_BND:
c34c98ed 3524 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 3525 address);
2e30d253
ILT		 3526 break;
3527
3528 case elfcpp::R_X86_64_16:
c34c98ed 3529 Reloc_funcs::rela16(view, object, psymval, addend);
2e30d253
ILT		 3530 break;
3531
3532 case elfcpp::R_X86_64_PC16:
c34c98ed 3533 Reloc_funcs::pcrela16(view, object, psymval, addend, address);
2e30d253
ILT		 3534 break;
3535
3536 case elfcpp::R_X86_64_8:
c34c98ed 3537 Reloc_funcs::rela8(view, object, psymval, addend);
2e30d253
ILT		 3538 break;
3539
3540 case elfcpp::R_X86_64_PC8:
c34c98ed 3541 Reloc_funcs::pcrela8(view, object, psymval, addend, address);
2e30d253
ILT		 3542 break;
3543
3544 case elfcpp::R_X86_64_PLT32:
f49fe902 3545 case elfcpp::R_X86_64_PLT32_BND:
f389a824 3546 gold_assert(gsym == NULL
2e702c99 3547 || gsym->has_plt_offset()
99f8faca
ILT		 3548 || gsym->final_value_is_known()
3549 || (gsym->is_defined()
3550 && !gsym->is_from_dynobj()
3551 && !gsym->is_preemptible()));
ee9e9e86
ILT		 3552 // Note: while this code looks the same as for R_X86_64_PC32, it
3553 // behaves differently because psymval was set to point to
3554 // the PLT entry, rather than the symbol, in Scan::global().
c34c98ed 3555 rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend,
19ef3f4d 3556 address);
2e30d253
ILT		 3557 break;
3558
ee9e9e86
ILT		 3559 case elfcpp::R_X86_64_PLTOFF64:
3560 {
2e702c99
RM		 3561 gold_assert(gsym);
3562 gold_assert(gsym->has_plt_offset()
3563 || gsym->final_value_is_known());
fc51264f 3564 typename elfcpp::Elf_types<size>::Elf_Addr got_address;
c23dd342
L		 3565 // This is the address of GLOBAL_OFFSET_TABLE.
3566 got_address = target->got_plt_section()->address();
c34c98ed 3567 Reloc_funcs::rela64(view, object, psymval, addend - got_address);
ee9e9e86 3568 }
7849f6d8 3569 break;
ee9e9e86 3570
2e30d253 3571 case elfcpp::R_X86_64_GOT32:
0ffd9845 3572 gold_assert(have_got_offset);
c34c98ed 3573 Reloc_funcs::rela32(view, got_offset, addend);
2e30d253
ILT		 3574 break;
3575
e822f2b1
ILT		 3576 case elfcpp::R_X86_64_GOTPC32:
3577 {
2e702c99 3578 gold_assert(gsym);
fc51264f 3579 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 3580 value = target->got_plt_section()->address();
19ef3f4d 3581 Reloc_funcs::pcrela32_check(view, value, addend, address);
e822f2b1
ILT		 3582 }
3583 break;
3584
3585 case elfcpp::R_X86_64_GOT64:
fdc2f80f 3586 case elfcpp::R_X86_64_GOTPLT64:
e88ba8d5
L		 3587 // R_X86_64_GOTPLT64 is obsolete and treated the the same as
3588 // GOT64.
0ffd9845 3589 gold_assert(have_got_offset);
c34c98ed 3590 Reloc_funcs::rela64(view, got_offset, addend);
e822f2b1
ILT		 3591 break;
3592
3593 case elfcpp::R_X86_64_GOTPC64:
3594 {
2e702c99 3595 gold_assert(gsym);
fc51264f 3596 typename elfcpp::Elf_types<size>::Elf_Addr value;
96f2030e 3597 value = target->got_plt_section()->address();
c34c98ed 3598 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 3599 }
3600 break;
3601
2e30d253
ILT		 3602 case elfcpp::R_X86_64_GOTOFF64:
3603 {
fc51264f 3604 typename elfcpp::Elf_types<size>::Elf_Addr value;
2e30d253 3605 value = (psymval->value(object, 0)
96f2030e 3606 - target->got_plt_section()->address());
c34c98ed 3607 Reloc_funcs::rela64(view, value, addend);
2e30d253
ILT		 3608 }
3609 break;
3610
3611 case elfcpp::R_X86_64_GOTPCREL:
2891b491
L		 3612 case elfcpp::R_X86_64_GOTPCRELX:
3613 case elfcpp::R_X86_64_REX_GOTPCRELX:
2e30d253 3614 {
1fa29f10
IT		 3615 // Convert
3616 // mov foo@GOTPCREL(%rip), %reg
3617 // to lea foo(%rip), %reg.
3618 // if possible.
3619 if (rela.get_r_offset() >= 2
3620 && view[-2] == 0x8b
3621 && ((gsym == NULL && !psymval->is_ifunc_symbol())
3622 || (gsym != NULL
3623 && Target_x86_64<size>::can_convert_mov_to_lea(gsym))))
3624 {
3625 view[-2] = 0x8d;
19ef3f4d 3626 Reloc_funcs::pcrela32(view, object, psymval, addend, address);
1fa29f10
IT		 3627 }
3628 else
3629 {
3630 if (gsym != NULL)
3631 {
3632 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
3633 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
3634 }
3635 else
3636 {
3637 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3638 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
3639 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
3640 - target->got_size());
3641 }
3642 typename elfcpp::Elf_types<size>::Elf_Addr value;
3643 value = target->got_plt_section()->address() + got_offset;
19ef3f4d 3644 Reloc_funcs::pcrela32_check(view, value, addend, address);
1fa29f10 3645 }
2e30d253
ILT		 3646 }
3647 break;
3648
e822f2b1
ILT		 3649 case elfcpp::R_X86_64_GOTPCREL64:
3650 {
2e702c99
RM		 3651 gold_assert(have_got_offset);
3652 typename elfcpp::Elf_types<size>::Elf_Addr value;
3653 value = target->got_plt_section()->address() + got_offset;
c34c98ed 3654 Reloc_funcs::pcrela64(view, value, addend, address);
e822f2b1
ILT		 3655 }
3656 break;
3657
2e30d253
ILT		 3658 case elfcpp::R_X86_64_COPY:
3659 case elfcpp::R_X86_64_GLOB_DAT:
3660 case elfcpp::R_X86_64_JUMP_SLOT:
3661 case elfcpp::R_X86_64_RELATIVE:
7223e9ca 3662 case elfcpp::R_X86_64_IRELATIVE:
d61c17ea 3663 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 3664 case elfcpp::R_X86_64_TPOFF64:
2e30d253 3665 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 3666 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 3667 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3668 _("unexpected reloc %u in object file"),
3669 r_type);
2e30d253
ILT		 3670 break;
3671
d61c17ea 3672 // These are initial tls relocs, which are expected when linking
56622147
ILT		 3673 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
3674 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 3675 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 3676 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 3677 case elfcpp::R_X86_64_DTPOFF32:
3678 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 3679 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
3680 case elfcpp::R_X86_64_TPOFF32: // Local-exec
7bf1f802 3681 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
2e702c99 3682 view, address, view_size);
2e30d253 3683 break;
2e30d253 3684
fdc2f80f
ILT		 3685 case elfcpp::R_X86_64_SIZE32:
3686 case elfcpp::R_X86_64_SIZE64:
2e30d253 3687 default:
75f2446e
ILT		 3688 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3689 _("unsupported reloc %u"),
3690 r_type);
2e30d253
ILT		 3691 break;
3692 }
3693
c34c98ed
CC		 3694 if (rstatus == Reloc_funcs::RELOC_OVERFLOW)
3695 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3696 _("relocation overflow"));
3697
2e30d253
ILT		 3698 return true;
3699}
3700
3701// Perform a TLS relocation.
3702
fc51264f 3703template<int size>
2e30d253 3704inline void
fc51264f
L		 3705Target_x86_64<size>::Relocate::relocate_tls(
3706 const Relocate_info<size, false>* relinfo,
3707 Target_x86_64<size>* target,
3708 size_t relnum,
3709 const elfcpp::Rela<size, false>& rela,
3710 unsigned int r_type,
3711 const Sized_symbol<size>* gsym,
3712 const Symbol_value<size>* psymval,
3713 unsigned char* view,
3714 typename elfcpp::Elf_types<size>::Elf_Addr address,
3715 section_size_type view_size)
2e30d253 3716{
2e30d253 3717 Output_segment* tls_segment = relinfo->layout->tls_segment();
7bf1f802 3718
fc51264f 3719 const Sized_relobj_file<size, false>* object = relinfo->object;
6a41d30b 3720 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 3721 elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr);
36171d64 3722 bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0;
2e30d253 3723
fc51264f 3724 typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0);
2e30d253
ILT		 3725
3726 const bool is_final = (gsym == NULL
b3705d2a 3727 ? !parameters->options().shared()
2e30d253 3728 : gsym->final_value_is_known());
36171d64 3729 tls::Tls_optimization optimized_type
fc51264f 3730 = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 3731 switch (r_type)
3732 {
56622147 3733 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
36171d64
CC		 3734 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3735 {
3736 // If this code sequence is used in a non-executable section,
3737 // we will not optimize the R_X86_64_DTPOFF32/64 relocation,
3738 // on the assumption that it's being used by itself in a debug
3739 // section. Therefore, in the unlikely event that the code
3740 // sequence appears in a non-executable section, we simply
3741 // leave it unoptimized.
3742 optimized_type = tls::TLSOPT_NONE;
3743 }
e041f13d 3744 if (optimized_type == tls::TLSOPT_TO_LE)
2e30d253 3745 {
62855347
ILT		 3746 if (tls_segment == NULL)
3747 {
191f1a2d
ILT		 3748 gold_assert(parameters->errors()->error_count() > 0
3749 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3750 return;
3751 }
2e30d253 3752 this->tls_gd_to_le(relinfo, relnum, tls_segment,
72ec2876 3753 rela, r_type, value, view,
2e30d253
ILT		 3754 view_size);
3755 break;
3756 }
7bf1f802 3757 else
2e702c99
RM		 3758 {
3759 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3760 ? GOT_TYPE_TLS_OFFSET
3761 : GOT_TYPE_TLS_PAIR);
3762 unsigned int got_offset;
3763 if (gsym != NULL)
3764 {
3765 gold_assert(gsym->has_got_offset(got_type));
3766 got_offset = gsym->got_offset(got_type) - target->got_size();
3767 }
3768 else
3769 {
3770 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3771 gold_assert(object->local_has_got_offset(r_sym, got_type));
3772 got_offset = (object->local_got_offset(r_sym, got_type)
3773 - target->got_size());
3774 }
3775 if (optimized_type == tls::TLSOPT_TO_IE)
3776 {
3777 value = target->got_plt_section()->address() + got_offset;
d21f123b 3778 this->tls_gd_to_ie(relinfo, relnum, rela, r_type,
2e702c99
RM		 3779 value, view, address, view_size);
3780 break;
3781 }
3782 else if (optimized_type == tls::TLSOPT_NONE)
3783 {
3784 // Relocate the field with the offset of the pair of GOT
3785 // entries.
6a41d30b 3786 value = target->got_plt_section()->address() + got_offset;
2e702c99 3787 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3788 address);
2e702c99
RM		 3789 break;
3790 }
3791 }
72ec2876 3792 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 3793 _("unsupported reloc %u"), r_type);
2e30d253
ILT		 3794 break;
3795
c2b45e22
CC		 3796 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
3797 case elfcpp::R_X86_64_TLSDESC_CALL:
36171d64
CC		 3798 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3799 {
3800 // See above comment for R_X86_64_TLSGD.
3801 optimized_type = tls::TLSOPT_NONE;
3802 }
c2b45e22
CC		 3803 if (optimized_type == tls::TLSOPT_TO_LE)
3804 {
62855347
ILT		 3805 if (tls_segment == NULL)
3806 {
191f1a2d
ILT		 3807 gold_assert(parameters->errors()->error_count() > 0
3808 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3809 return;
3810 }
c2b45e22 3811 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2e702c99
RM		 3812 rela, r_type, value, view,
3813 view_size);
c2b45e22
CC		 3814 break;
3815 }
3816 else
2e702c99
RM		 3817 {
3818 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
3819 ? GOT_TYPE_TLS_OFFSET
3820 : GOT_TYPE_TLS_DESC);
3821 unsigned int got_offset = 0;
a8df5856
ILT		 3822 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC
3823 && optimized_type == tls::TLSOPT_NONE)
3824 {
3825 // We created GOT entries in the .got.tlsdesc portion of
3826 // the .got.plt section, but the offset stored in the
3827 // symbol is the offset within .got.tlsdesc.
3828 got_offset = (target->got_size()
3829 + target->got_plt_section()->data_size());
3830 }
2e702c99
RM		 3831 if (gsym != NULL)
3832 {
3833 gold_assert(gsym->has_got_offset(got_type));
3834 got_offset += gsym->got_offset(got_type) - target->got_size();
3835 }
3836 else
3837 {
3838 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3839 gold_assert(object->local_has_got_offset(r_sym, got_type));
3840 got_offset += (object->local_got_offset(r_sym, got_type)
a8df5856 3841 - target->got_size());
2e702c99
RM		 3842 }
3843 if (optimized_type == tls::TLSOPT_TO_IE)
3844 {
2e702c99 3845 value = target->got_plt_section()->address() + got_offset;
d21f123b 3846 this->tls_desc_gd_to_ie(relinfo, relnum,
2e702c99
RM		 3847 rela, r_type, value, view, address,
3848 view_size);
3849 break;
3850 }
3851 else if (optimized_type == tls::TLSOPT_NONE)
3852 {
3853 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
3854 {
3855 // Relocate the field with the offset of the pair of GOT
3856 // entries.
3857 value = target->got_plt_section()->address() + got_offset;
3858 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3859 address);
2e702c99
RM		 3860 }
3861 break;
3862 }
3863 }
c2b45e22
CC		 3864 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3865 _("unsupported reloc %u"), r_type);
3866 break;
3867
56622147 3868 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
36171d64
CC		 3869 if (!is_executable && optimized_type == tls::TLSOPT_TO_LE)
3870 {
3871 // See above comment for R_X86_64_TLSGD.
3872 optimized_type = tls::TLSOPT_NONE;
3873 }
e041f13d 3874 if (optimized_type == tls::TLSOPT_TO_LE)
2e702c99 3875 {
62855347
ILT		 3876 if (tls_segment == NULL)
3877 {
191f1a2d
ILT		 3878 gold_assert(parameters->errors()->error_count() > 0
3879 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3880 return;
3881 }
72ec2876
ILT		 3882 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
3883 value, view, view_size);
3884 break;
2e702c99 3885 }
7bf1f802 3886 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 3887 {
3888 // Relocate the field with the offset of the GOT entry for
3889 // the module index.
3890 unsigned int got_offset;
3891 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
31d60480 3892 - target->got_size());
6a41d30b 3893 value = target->got_plt_section()->address() + got_offset;
2e702c99 3894 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3895 address);
2e702c99
RM		 3896 break;
3897 }
72ec2876 3898 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 3899 _("unsupported reloc %u"), r_type);
2e30d253 3900 break;
0ffd9845
ILT		 3901
3902 case elfcpp::R_X86_64_DTPOFF32:
36171d64
CC		 3903 // This relocation type is used in debugging information.
3904 // In that case we need to not optimize the value. If the
3905 // section is not executable, then we assume we should not
3906 // optimize this reloc. See comments above for R_X86_64_TLSGD,
3907 // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and
3908 // R_X86_64_TLSLD.
3909 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3910 {
62855347
ILT		 3911 if (tls_segment == NULL)
3912 {
191f1a2d
ILT		 3913 gold_assert(parameters->errors()->error_count() > 0
3914 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3915 return;
3916 }
36171d64
CC		 3917 value -= tls_segment->memsz();
3918 }
fc51264f 3919 Relocate_functions<size, false>::rela32(view, value, addend);
0ffd9845
ILT		 3920 break;
3921
3922 case elfcpp::R_X86_64_DTPOFF64:
36171d64
CC		 3923 // See R_X86_64_DTPOFF32, just above, for why we check for is_executable.
3924 if (optimized_type == tls::TLSOPT_TO_LE && is_executable)
3925 {
62855347
ILT		 3926 if (tls_segment == NULL)
3927 {
191f1a2d
ILT		 3928 gold_assert(parameters->errors()->error_count() > 0
3929 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3930 return;
3931 }
36171d64
CC		 3932 value -= tls_segment->memsz();
3933 }
fc51264f 3934 Relocate_functions<size, false>::rela64(view, value, addend);
0ffd9845 3935 break;
2e30d253 3936
56622147 3937 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
24dd5808
CC		 3938 if (gsym != NULL
3939 && gsym->is_undefined()
3940 && parameters->options().output_is_executable())
65d92137
CC		 3941 {
3942 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3943 NULL, rela,
3944 r_type, value, view,
3945 view_size);
3946 break;
3947 }
3948 else if (optimized_type == tls::TLSOPT_TO_LE)
56622147 3949 {
62855347
ILT		 3950 if (tls_segment == NULL)
3951 {
191f1a2d
ILT		 3952 gold_assert(parameters->errors()->error_count() > 0
3953 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3954 return;
3955 }
fc51264f
L		 3956 Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum,
3957 tls_segment, rela,
3958 r_type, value, view,
3959 view_size);
56622147
ILT		 3960 break;
3961 }
7bf1f802 3962 else if (optimized_type == tls::TLSOPT_NONE)
2e702c99
RM		 3963 {
3964 // Relocate the field with the offset of the GOT entry for
3965 // the tp-relative offset of the symbol.
3966 unsigned int got_offset;
3967 if (gsym != NULL)
3968 {
3969 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
3970 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
3971 - target->got_size());
3972 }
3973 else
3974 {
3975 unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info());
3976 gold_assert(object->local_has_got_offset(r_sym,
3977 GOT_TYPE_TLS_OFFSET));
3978 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
3979 - target->got_size());
3980 }
6a41d30b 3981 value = target->got_plt_section()->address() + got_offset;
2e702c99 3982 Relocate_functions<size, false>::pcrela32(view, value, addend,
fc51264f 3983 address);
2e702c99
RM		 3984 break;
3985 }
56622147
ILT		 3986 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
3987 _("unsupported reloc type %u"),
3988 r_type);
3989 break;
0ffd9845 3990
56622147 3991 case elfcpp::R_X86_64_TPOFF32: // Local-exec
62855347
ILT		 3992 if (tls_segment == NULL)
3993 {
191f1a2d
ILT		 3994 gold_assert(parameters->errors()->error_count() > 0
3995 || issue_undefined_symbol_error(gsym));
62855347
ILT		 3996 return;
3997 }
6a41d30b 3998 value -= tls_segment->memsz();
fc51264f 3999 Relocate_functions<size, false>::rela32(view, value, addend);
56622147 4000 break;
2e30d253 4001 }
2e30d253
ILT		 4002}
4003
7bf1f802
ILT		 4004// Do a relocation in which we convert a TLS General-Dynamic to an
4005// Initial-Exec.
4006
fc51264f 4007template<int size>
7bf1f802 4008inline void
fc51264f
L		 4009Target_x86_64<size>::Relocate::tls_gd_to_ie(
4010 const Relocate_info<size, false>* relinfo,
4011 size_t relnum,
fc51264f
L		 4012 const elfcpp::Rela<size, false>& rela,
4013 unsigned int,
4014 typename elfcpp::Elf_types<size>::Elf_Addr value,
4015 unsigned char* view,
4016 typename elfcpp::Elf_types<size>::Elf_Addr address,
4017 section_size_type view_size)
7bf1f802 4018{
41194d9f
L		 4019 // For SIZE == 64:
4020 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4021 // .word 0x6666; rex64; call __tls_get_addr
4022 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
4023 // For SIZE == 32:
4024 // leaq foo@tlsgd(%rip),%rdi;
4025 // .word 0x6666; rex64; call __tls_get_addr
4026 // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax
7bf1f802 4027
7bf1f802 4028 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
7bf1f802 4029 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4030 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
7bf1f802 4031
41194d9f
L		 4032 if (size == 64)
4033 {
4034 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4035 -4);
4036 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4037 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
4038 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
4039 16);
4040 }
4041 else
4042 {
4043 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4044 -3);
4045 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4046 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
4047 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0",
4048 15);
4049 }
7bf1f802 4050
c2b45e22 4051 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f
L		 4052 Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8,
4053 address);
7bf1f802
ILT		 4054
4055 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4056 // We can skip it.
4057 this->skip_call_tls_get_addr_ = true;
4058}
4059
e041f13d 4060// Do a relocation in which we convert a TLS General-Dynamic to a
2e30d253
ILT		 4061// Local-Exec.
4062
fc51264f 4063template<int size>
2e30d253 4064inline void
fc51264f
L		 4065Target_x86_64<size>::Relocate::tls_gd_to_le(
4066 const Relocate_info<size, false>* relinfo,
4067 size_t relnum,
4068 Output_segment* tls_segment,
4069 const elfcpp::Rela<size, false>& rela,
4070 unsigned int,
4071 typename elfcpp::Elf_types<size>::Elf_Addr value,
4072 unsigned char* view,
4073 section_size_type view_size)
2e30d253 4074{
41194d9f
L		 4075 // For SIZE == 64:
4076 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
4077 // .word 0x6666; rex64; call __tls_get_addr
4078 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
4079 // For SIZE == 32:
4080 // leaq foo@tlsgd(%rip),%rdi;
4081 // .word 0x6666; rex64; call __tls_get_addr
4082 // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax
2e30d253 4083
72ec2876 4084 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
72ec2876 4085 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
41194d9f
L		 4086 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
4087
4088 if (size == 64)
4089 {
4090 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4091 -4);
4092 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4093 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
4094 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4095 16);
4096 }
4097 else
4098 {
4099 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size,
4100 -3);
4101 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
4102 (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0));
2e30d253 4103
41194d9f
L		 4104 memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0",
4105 15);
4106 }
2e30d253 4107
6a41d30b 4108 value -= tls_segment->memsz();
fc51264f 4109 Relocate_functions<size, false>::rela32(view + 8, value, 0);
2e30d253
ILT		 4110
4111 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4112 // We can skip it.
4113 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 4114}
4115
c2b45e22
CC		 4116// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
4117
fc51264f 4118template<int size>
c2b45e22 4119inline void
fc51264f
L		 4120Target_x86_64<size>::Relocate::tls_desc_gd_to_ie(
4121 const Relocate_info<size, false>* relinfo,
c2b45e22 4122 size_t relnum,
fc51264f 4123 const elfcpp::Rela<size, false>& rela,
c2b45e22 4124 unsigned int r_type,
fc51264f 4125 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22 4126 unsigned char* view,
fc51264f 4127 typename elfcpp::Elf_types<size>::Elf_Addr address,
c2b45e22
CC		 4128 section_size_type view_size)
4129{
4130 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4131 {
4132 // leaq foo@tlsdesc(%rip), %rax
4133 // ==> movq foo@gottpoff(%rip), %rax
4134 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4135 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4136 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4137 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 4138 view[-2] = 0x8b;
4139 const elfcpp::Elf_Xword addend = rela.get_r_addend();
fc51264f 4140 Relocate_functions<size, false>::pcrela32(view, value, addend, address);
c2b45e22
CC		 4141 }
4142 else
4143 {
4144 // call *foo@tlscall(%rax)
4145 // ==> nop; nop
4146 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4147 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4148 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4149 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 4150 view[0] = 0x66;
4151 view[1] = 0x90;
4152 }
4153}
4154
4155// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
4156
fc51264f 4157template<int size>
c2b45e22 4158inline void
fc51264f
L		 4159Target_x86_64<size>::Relocate::tls_desc_gd_to_le(
4160 const Relocate_info<size, false>* relinfo,
c2b45e22
CC		 4161 size_t relnum,
4162 Output_segment* tls_segment,
fc51264f 4163 const elfcpp::Rela<size, false>& rela,
c2b45e22 4164 unsigned int r_type,
fc51264f 4165 typename elfcpp::Elf_types<size>::Elf_Addr value,
c2b45e22
CC		 4166 unsigned char* view,
4167 section_size_type view_size)
4168{
4169 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
4170 {
4171 // leaq foo@tlsdesc(%rip), %rax
4172 // ==> movq foo@tpoff, %rax
4173 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4174 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4175 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4176 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
c2b45e22
CC		 4177 view[-2] = 0xc7;
4178 view[-1] = 0xc0;
4179 value -= tls_segment->memsz();
fc51264f 4180 Relocate_functions<size, false>::rela32(view, value, 0);
c2b45e22
CC		 4181 }
4182 else
4183 {
4184 // call *foo@tlscall(%rax)
4185 // ==> nop; nop
4186 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
4187 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
4188 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4189 view[0] == 0xff && view[1] == 0x10);
c2b45e22
CC		 4190 view[0] = 0x66;
4191 view[1] = 0x90;
4192 }
4193}
4194
fc51264f 4195template<int size>
2e30d253 4196inline void
fc51264f
L		 4197Target_x86_64<size>::Relocate::tls_ld_to_le(
4198 const Relocate_info<size, false>* relinfo,
4199 size_t relnum,
4200 Output_segment*,
4201 const elfcpp::Rela<size, false>& rela,
4202 unsigned int,
4203 typename elfcpp::Elf_types<size>::Elf_Addr,
4204 unsigned char* view,
4205 section_size_type view_size)
2e30d253 4206{
72ec2876 4207 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
d2cf1c6c 4208 // For SIZE == 64:
72ec2876
ILT		 4209 // ... leq foo@dtpoff(%rax),%reg
4210 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
d2cf1c6c
L		 4211 // For SIZE == 32:
4212 // ... leq foo@dtpoff(%rax),%reg
4213 // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx
2e30d253 4214
72ec2876
ILT		 4215 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4216 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
2e30d253 4217
72ec2876 4218 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2e702c99 4219 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
72ec2876
ILT		 4220
4221 tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
4222
d2cf1c6c
L		 4223 if (size == 64)
4224 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
4225 else
4226 memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12);
72ec2876
ILT		 4227
4228 // The next reloc should be a PLT32 reloc against __tls_get_addr.
4229 // We can skip it.
4230 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 4231}
4232
56622147
ILT		 4233// Do a relocation in which we convert a TLS Initial-Exec to a
4234// Local-Exec.
4235
fc51264f 4236template<int size>
56622147 4237inline void
fc51264f
L		 4238Target_x86_64<size>::Relocate::tls_ie_to_le(
4239 const Relocate_info<size, false>* relinfo,
4240 size_t relnum,
4241 Output_segment* tls_segment,
4242 const elfcpp::Rela<size, false>& rela,
4243 unsigned int,
4244 typename elfcpp::Elf_types<size>::Elf_Addr value,
4245 unsigned char* view,
4246 section_size_type view_size)
56622147
ILT		 4247{
4248 // We need to examine the opcodes to figure out which instruction we
4249 // are looking at.
4250
4251 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
4252 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
4253
4254 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
4255 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
4256
4257 unsigned char op1 = view[-3];
4258 unsigned char op2 = view[-2];
4259 unsigned char op3 = view[-1];
4260 unsigned char reg = op3 >> 3;
4261
4262 if (op2 == 0x8b)
4263 {
4264 // movq
4265 if (op1 == 0x4c)
2e702c99 4266 view[-3] = 0x49;
e749cab8
L		 4267 else if (size == 32 && op1 == 0x44)
4268 view[-3] = 0x41;
56622147
ILT		 4269 view[-2] = 0xc7;
4270 view[-1] = 0xc0 | reg;
4271 }
4272 else if (reg == 4)
4273 {
4274 // Special handling for %rsp.
4275 if (op1 == 0x4c)
2e702c99 4276 view[-3] = 0x49;
e749cab8
L		 4277 else if (size == 32 && op1 == 0x44)
4278 view[-3] = 0x41;
56622147
ILT		 4279 view[-2] = 0x81;
4280 view[-1] = 0xc0 | reg;
4281 }
4282 else
4283 {
4284 // addq
4285 if (op1 == 0x4c)
2e702c99 4286 view[-3] = 0x4d;
e749cab8
L		 4287 else if (size == 32 && op1 == 0x44)
4288 view[-3] = 0x45;
56622147
ILT		 4289 view[-2] = 0x8d;
4290 view[-1] = 0x80 | reg | (reg << 3);
4291 }
4292
65d92137
CC		 4293 if (tls_segment != NULL)
4294 value -= tls_segment->memsz();
fc51264f 4295 Relocate_functions<size, false>::rela32(view, value, 0);
56622147
ILT		 4296}
4297
2e30d253
ILT		 4298// Relocate section data.
4299
fc51264f 4300template<int size>
2e30d253 4301void
fc51264f
L		 4302Target_x86_64<size>::relocate_section(
4303 const Relocate_info<size, false>* relinfo,
364c7fa5
ILT		 4304 unsigned int sh_type,
4305 const unsigned char* prelocs,
4306 size_t reloc_count,
4307 Output_section* output_section,
4308 bool needs_special_offset_handling,
4309 unsigned char* view,
fc51264f 4310 typename elfcpp::Elf_types<size>::Elf_Addr address,
364c7fa5
ILT		 4311 section_size_type view_size,
4312 const Reloc_symbol_changes* reloc_symbol_changes)
2e30d253 4313{
4d625b70
CC		 4314 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4315 Classify_reloc;
4316
2e30d253
ILT		 4317 gold_assert(sh_type == elfcpp::SHT_RELA);
4318
4d625b70
CC		 4319 gold::relocate_section<size, false, Target_x86_64<size>, Relocate,
4320 gold::Default_comdat_behavior, Classify_reloc>(
2e30d253
ILT		 4321 relinfo,
4322 this,
4323 prelocs,
4324 reloc_count,
730cdc88
ILT		 4325 output_section,
4326 needs_special_offset_handling,
2e30d253
ILT		 4327 view,
4328 address,
364c7fa5
ILT		 4329 view_size,
4330 reloc_symbol_changes);
2e30d253
ILT		 4331}
4332
94a3fc8b
CC		 4333// Apply an incremental relocation. Incremental relocations always refer
4334// to global symbols.
4335
fc51264f 4336template<int size>
94a3fc8b 4337void
fc51264f
L		 4338Target_x86_64<size>::apply_relocation(
4339 const Relocate_info<size, false>* relinfo,
4340 typename elfcpp::Elf_types<size>::Elf_Addr r_offset,
94a3fc8b 4341 unsigned int r_type,
fc51264f 4342 typename elfcpp::Elf_types<size>::Elf_Swxword r_addend,
94a3fc8b
CC		 4343 const Symbol* gsym,
4344 unsigned char* view,
fc51264f 4345 typename elfcpp::Elf_types<size>::Elf_Addr address,
94a3fc8b
CC		 4346 section_size_type view_size)
4347{
fc51264f 4348 gold::apply_relocation<size, false, Target_x86_64<size>,
618d6666 4349 typename Target_x86_64<size>::Relocate>(
94a3fc8b
CC		 4350 relinfo,
4351 this,
4352 r_offset,
4353 r_type,
4354 r_addend,
4355 gsym,
4356 view,
4357 address,
4358 view_size);
4359}
4360
4d625b70 4361// Scan the relocs during a relocatable link.
6a74a719 4362
fc51264f 4363template<int size>
4d625b70
CC		 4364void
4365Target_x86_64<size>::scan_relocatable_relocs(
4366 Symbol_table* symtab,
4367 Layout* layout,
4368 Sized_relobj_file<size, false>* object,
4369 unsigned int data_shndx,
4370 unsigned int sh_type,
4371 const unsigned char* prelocs,
4372 size_t reloc_count,
4373 Output_section* output_section,
4374 bool needs_special_offset_handling,
4375 size_t local_symbol_count,
4376 const unsigned char* plocal_symbols,
4377 Relocatable_relocs* rr)
6a74a719 4378{
4d625b70
CC		 4379 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4380 Classify_reloc;
4381 typedef gold::Default_scan_relocatable_relocs<Classify_reloc>
4382 Scan_relocatable_relocs;
6a74a719 4383
4d625b70 4384 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 4385
4d625b70
CC		 4386 gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>(
4387 symtab,
4388 layout,
4389 object,
4390 data_shndx,
4391 prelocs,
4392 reloc_count,
4393 output_section,
4394 needs_special_offset_handling,
4395 local_symbol_count,
4396 plocal_symbols,
4397 rr);
6a74a719
ILT		 4398}
4399
4d625b70 4400// Scan the relocs for --emit-relocs.
6a74a719 4401
fc51264f 4402template<int size>
6a74a719 4403void
4d625b70 4404Target_x86_64<size>::emit_relocs_scan(
fc51264f
L		 4405 Symbol_table* symtab,
4406 Layout* layout,
4407 Sized_relobj_file<size, false>* object,
4408 unsigned int data_shndx,
4409 unsigned int sh_type,
4410 const unsigned char* prelocs,
4411 size_t reloc_count,
4412 Output_section* output_section,
4413 bool needs_special_offset_handling,
4414 size_t local_symbol_count,
4d625b70 4415 const unsigned char* plocal_syms,
fc51264f 4416 Relocatable_relocs* rr)
6a74a719 4417{
4d625b70
CC		 4418 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4419 Classify_reloc;
4420 typedef gold::Default_emit_relocs_strategy<Classify_reloc>
4421 Emit_relocs_strategy;
6a74a719 4422
4d625b70 4423 gold_assert(sh_type == elfcpp::SHT_RELA);
6a74a719 4424
4d625b70 4425 gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>(
6a74a719
ILT		 4426 symtab,
4427 layout,
4428 object,
4429 data_shndx,
4430 prelocs,
4431 reloc_count,
4432 output_section,
4433 needs_special_offset_handling,
4434 local_symbol_count,
4d625b70 4435 plocal_syms,
6a74a719
ILT		 4436 rr);
4437}
4438
4439// Relocate a section during a relocatable link.
4440
fc51264f 4441template<int size>
6a74a719 4442void
7404fe1b 4443Target_x86_64<size>::relocate_relocs(
fc51264f 4444 const Relocate_info<size, false>* relinfo,
6a74a719
ILT		 4445 unsigned int sh_type,
4446 const unsigned char* prelocs,
4447 size_t reloc_count,
4448 Output_section* output_section,
62fe925a 4449 typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section,
6a74a719 4450 unsigned char* view,
fc51264f 4451 typename elfcpp::Elf_types<size>::Elf_Addr view_address,
6a74a719
ILT		 4452 section_size_type view_size,
4453 unsigned char* reloc_view,
4454 section_size_type reloc_view_size)
4455{
4d625b70
CC		 4456 typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false>
4457 Classify_reloc;
4458
6a74a719
ILT		 4459 gold_assert(sh_type == elfcpp::SHT_RELA);
4460
4d625b70 4461 gold::relocate_relocs<size, false, Classify_reloc>(
6a74a719
ILT		 4462 relinfo,
4463 prelocs,
4464 reloc_count,
4465 output_section,
4466 offset_in_output_section,
6a74a719
ILT		 4467 view,
4468 view_address,
4469 view_size,
4470 reloc_view,
4471 reloc_view_size);
4472}
4473
4fb6c25d
ILT		 4474// Return the value to use for a dynamic which requires special
4475// treatment. This is how we support equality comparisons of function
4476// pointers across shared library boundaries, as described in the
4477// processor specific ABI supplement.
4478
fc51264f 4479template<int size>
4fb6c25d 4480uint64_t
fc51264f 4481Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const
4fb6c25d
ILT		 4482{
4483 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
19fec8c1 4484 return this->plt_address_for_global(gsym);
4fb6c25d
ILT		 4485}
4486
2e30d253
ILT		 4487// Return a string used to fill a code section with nops to take up
4488// the specified length.
4489
fc51264f 4490template<int size>
2e30d253 4491std::string
fc51264f 4492Target_x86_64<size>::do_code_fill(section_size_type length) const
2e30d253
ILT		 4493{
4494 if (length >= 16)
4495 {
4496 // Build a jmpq instruction to skip over the bytes.
4497 unsigned char jmp[5];
4498 jmp[0] = 0xe9;
04bf7072 4499 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2e30d253 4500 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2e702c99 4501 + std::string(length - 5, static_cast<char>(0x90)));
2e30d253
ILT		 4502 }
4503
4504 // Nop sequences of various lengths.
76677ad0
CC		 4505 const char nop1[1] = { '\x90' }; // nop
4506 const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax
4507 const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax)
4508 const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax)
2e702c99 4509 '\x00'};
76677ad0
CC		 4510 const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1)
4511 '\x00', '\x00' };
4512 const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1)
2e702c99 4513 '\x44', '\x00', '\x00' };
76677ad0 4514 const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax)
2e702c99 4515 '\x00', '\x00', '\x00',
76677ad0
CC		 4516 '\x00' };
4517 const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1)
2e702c99 4518 '\x00', '\x00', '\x00',
76677ad0
CC		 4519 '\x00', '\x00' };
4520 const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1)
2e702c99 4521 '\x84', '\x00', '\x00',
76677ad0
CC		 4522 '\x00', '\x00', '\x00' };
4523 const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
2e702c99 4524 '\x1f', '\x84', '\x00',
76677ad0
CC		 4525 '\x00', '\x00', '\x00',
4526 '\x00' };
4527 const char nop11[11] = { '\x66', '\x66', '\x2e', // data16
2e702c99 4528 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4529 '\x00', '\x00', '\x00',
4530 '\x00', '\x00' };
4531 const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16
2e702c99 4532 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4533 '\x84', '\x00', '\x00',
4534 '\x00', '\x00', '\x00' };
4535 const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4536 '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1)
76677ad0
CC		 4537 '\x1f', '\x84', '\x00',
4538 '\x00', '\x00', '\x00',
2e702c99 4539 '\x00' };
76677ad0 4540 const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4541 '\x66', '\x66', '\x2e', // data16
76677ad0
CC		 4542 '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1)
4543 '\x00', '\x00', '\x00',
2e702c99 4544 '\x00', '\x00' };
76677ad0 4545 const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16
2e702c99 4546 '\x66', '\x66', '\x66', // data16; data16
76677ad0
CC		 4547 '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1)
4548 '\x84', '\x00', '\x00',
2e702c99 4549 '\x00', '\x00', '\x00' };
2e30d253
ILT		 4550
4551 const char* nops[16] = {
4552 NULL,
4553 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
4554 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
4555 };
4556
4557 return std::string(nops[length], length);
4558}
4559
e291e7b9
ILT		 4560// Return the addend to use for a target specific relocation. The
4561// only target specific relocation is R_X86_64_TLSDESC for a local
4562// symbol. We want to set the addend is the offset of the local
4563// symbol in the TLS segment.
4564
fc51264f 4565template<int size>
e291e7b9 4566uint64_t
fc51264f
L		 4567Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type,
4568 uint64_t) const
e291e7b9
ILT		 4569{
4570 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC);
4571 uintptr_t intarg = reinterpret_cast<uintptr_t>(arg);
4572 gold_assert(intarg < this->tlsdesc_reloc_info_.size());
4573 const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]);
fc51264f 4574 const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym);
e291e7b9
ILT		 4575 gold_assert(psymval->is_tls_symbol());
4576 // The value of a TLS symbol is the offset in the TLS segment.
4577 return psymval->value(ti.object, 0);
4578}
4579
02d7cd44
ILT		 4580// Return the value to use for the base of a DW_EH_PE_datarel offset
4581// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
4582// assembler can not write out the difference between two labels in
4583// different sections, so instead of using a pc-relative value they
4584// use an offset from the GOT.
4585
fc51264f 4586template<int size>
02d7cd44 4587uint64_t
fc51264f 4588Target_x86_64<size>::do_ehframe_datarel_base() const
02d7cd44
ILT		 4589{
4590 gold_assert(this->global_offset_table_ != NULL);
4591 Symbol* sym = this->global_offset_table_;
fc51264f 4592 Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym);
02d7cd44
ILT		 4593 return ssym->value();
4594}
4595
364c7fa5 4596// FNOFFSET in section SHNDX in OBJECT is the start of a function
9b547ce6 4597// compiled with -fsplit-stack. The function calls non-split-stack
364c7fa5
ILT		 4598// code. We have to change the function so that it always ensures
4599// that it has enough stack space to run some random function.
4600
4fc1b9d4
L		 4601static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 };
4602static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 };
4603static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 };
4604
4605static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 };
4606static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 };
4607static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 };
4608
fc51264f 4609template<int size>
364c7fa5 4610void
fc51264f
L		 4611Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx,
4612 section_offset_type fnoffset,
4613 section_size_type fnsize,
6e0813d3
CC		 4614 const unsigned char*,
4615 size_t,
fc51264f
L		 4616 unsigned char* view,
4617 section_size_type view_size,
4618 std::string* from,
4619 std::string* to) const
364c7fa5 4620{
4fc1b9d4
L		 4621 const char* const cmp_insn = reinterpret_cast<const char*>
4622 (size == 32 ? cmp_insn_32 : cmp_insn_64);
4623 const char* const lea_r10_insn = reinterpret_cast<const char*>
4624 (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64);
4625 const char* const lea_r11_insn = reinterpret_cast<const char*>
4626 (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64);
4627
4628 const size_t cmp_insn_len =
4629 (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64));
4630 const size_t lea_r10_insn_len =
4631 (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64));
4632 const size_t lea_r11_insn_len =
4633 (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64));
4634 const size_t nop_len = (size == 32 ? 7 : 8);
4635
364c7fa5
ILT		 4636 // The function starts with a comparison of the stack pointer and a
4637 // field in the TCB. This is followed by a jump.
4638
4639 // cmp %fs:NN,%rsp
4fc1b9d4
L		 4640 if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len)
4641 && fnsize > nop_len + 1)
364c7fa5
ILT		 4642 {
4643 // We will call __morestack if the carry flag is set after this
4644 // comparison. We turn the comparison into an stc instruction
4645 // and some nops.
4646 view[fnoffset] = '\xf9';
4fc1b9d4 4647 this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len);
364c7fa5
ILT		 4648 }
4649 // lea NN(%rsp),%r10
cbc999b9
ILT		 4650 // lea NN(%rsp),%r11
4651 else if ((this->match_view(view, view_size, fnoffset,
4fc1b9d4 4652 lea_r10_insn, lea_r10_insn_len)
cbc999b9 4653 || this->match_view(view, view_size, fnoffset,
4fc1b9d4 4654 lea_r11_insn, lea_r11_insn_len))
364c7fa5
ILT		 4655 && fnsize > 8)
4656 {
4657 // This is loading an offset from the stack pointer for a
4658 // comparison. The offset is negative, so we decrease the
4659 // offset by the amount of space we need for the stack. This
4660 // means we will avoid calling __morestack if there happens to
4661 // be plenty of space on the stack already.
4662 unsigned char* pval = view + fnoffset + 4;
4663 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
4664 val -= parameters->options().split_stack_adjust_size();
4665 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
4666 }
4667 else
4668 {
4669 if (!object->has_no_split_stack())
4670 object->error(_("failed to match split-stack sequence at "
4671 "section %u offset %0zx"),
ac33a407 4672 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 4673 return;
4674 }
4675
4676 // We have to change the function so that it calls
4677 // __morestack_non_split instead of __morestack. The former will
4678 // allocate additional stack space.
4679 *from = "__morestack";
4680 *to = "__morestack_non_split";
4681}
4682
2e702c99
RM		 4683// The selector for x86_64 object files. Note this is never instantiated
4684// directly. It's only used in Target_selector_x86_64_nacl, below.
2e30d253 4685
fc51264f 4686template<int size>
36959681 4687class Target_selector_x86_64 : public Target_selector_freebsd
2e30d253
ILT		 4688{
4689public:
4690 Target_selector_x86_64()
fc51264f 4691 : Target_selector_freebsd(elfcpp::EM_X86_64, size, false,
2e702c99 4692 (size == 64
fc51264f 4693 ? "elf64-x86-64" : "elf32-x86-64"),
2e702c99 4694 (size == 64
fc51264f
L		 4695 ? "elf64-x86-64-freebsd"
4696 : "elf32-x86-64-freebsd"),
4697 (size == 64 ? "elf_x86_64" : "elf32_x86_64"))
2e30d253
ILT		 4698 { }
4699
4700 Target*
e96caa79 4701 do_instantiate_target()
fc51264f 4702 { return new Target_x86_64<size>(); }
36959681 4703
2e30d253
ILT		 4704};
4705
2e702c99
RM		 4706// NaCl variant. It uses different PLT contents.
4707
4708template<int size>
4709class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size>
4710{
4711 public:
4712 Output_data_plt_x86_64_nacl(Layout* layout,
4713 Output_data_got<64, false>* got,
57b2284c 4714 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4715 Output_data_space* got_irelative)
4716 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4717 got, got_plt, got_irelative)
4718 { }
4719
4720 Output_data_plt_x86_64_nacl(Layout* layout,
4721 Output_data_got<64, false>* got,
57b2284c 4722 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4723 Output_data_space* got_irelative,
4724 unsigned int plt_count)
4725 : Output_data_plt_x86_64<size>(layout, plt_entry_size,
4726 got, got_plt, got_irelative,
4727 plt_count)
4728 { }
4729
4730 protected:
4731 virtual unsigned int
4732 do_get_plt_entry_size() const
4733 { return plt_entry_size; }
4734
4735 virtual void
4736 do_add_eh_frame(Layout* layout)
4737 {
4738 layout->add_eh_frame_for_plt(this,
4739 this->plt_eh_frame_cie,
4740 this->plt_eh_frame_cie_size,
4741 plt_eh_frame_fde,
4742 plt_eh_frame_fde_size);
4743 }
4744
4745 virtual void
4746 do_fill_first_plt_entry(unsigned char* pov,
4747 typename elfcpp::Elf_types<size>::Elf_Addr got_addr,
4748 typename elfcpp::Elf_types<size>::Elf_Addr plt_addr);
4749
4750 virtual unsigned int
4751 do_fill_plt_entry(unsigned char* pov,
4752 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4753 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4754 unsigned int got_offset,
4755 unsigned int plt_offset,
4756 unsigned int plt_index);
4757
4758 virtual void
4759 do_fill_tlsdesc_entry(unsigned char* pov,
4760 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4761 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4762 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
4763 unsigned int tlsdesc_got_offset,
4764 unsigned int plt_offset);
4765
4766 private:
4767 // The size of an entry in the PLT.
4768 static const int plt_entry_size = 64;
4769
4770 // The first entry in the PLT.
4771 static const unsigned char first_plt_entry[plt_entry_size];
4772
4773 // Other entries in the PLT for an executable.
4774 static const unsigned char plt_entry[plt_entry_size];
4775
4776 // The reserved TLSDESC entry in the PLT for an executable.
4777 static const unsigned char tlsdesc_plt_entry[plt_entry_size];
4778
4779 // The .eh_frame unwind information for the PLT.
4780 static const int plt_eh_frame_fde_size = 32;
4781 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
4782};
4783
4784template<int size>
4785class Target_x86_64_nacl : public Target_x86_64<size>
4786{
4787 public:
4788 Target_x86_64_nacl()
4789 : Target_x86_64<size>(&x86_64_nacl_info)
4790 { }
4791
4792 virtual Output_data_plt_x86_64<size>*
4793 do_make_data_plt(Layout* layout,
4794 Output_data_got<64, false>* got,
57b2284c 4795 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4796 Output_data_space* got_irelative)
4797 {
4798 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4799 got_irelative);
4800 }
4801
4802 virtual Output_data_plt_x86_64<size>*
4803 do_make_data_plt(Layout* layout,
4804 Output_data_got<64, false>* got,
57b2284c 4805 Output_data_got_plt_x86_64* got_plt,
2e702c99
RM		 4806 Output_data_space* got_irelative,
4807 unsigned int plt_count)
4808 {
4809 return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt,
4810 got_irelative,
4811 plt_count);
4812 }
4813
93f8221c
RM		 4814 virtual std::string
4815 do_code_fill(section_size_type length) const;
4816
2e702c99
RM		 4817 private:
4818 static const Target::Target_info x86_64_nacl_info;
4819};
4820
4821template<>
4822const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info =
4823{
4824 64, // size
4825 false, // is_big_endian
4826 elfcpp::EM_X86_64, // machine_code
4827 false, // has_make_symbol
4828 false, // has_resolve
4829 true, // has_code_fill
4830 true, // is_default_stack_executable
4831 true, // can_icf_inline_merge_sections
4832 '\0', // wrap_char
4833 "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker
4834 0x20000, // default_text_segment_address
4835 0x10000, // abi_pagesize (overridable by -z max-page-size)
4836 0x10000, // common_pagesize (overridable by -z common-page-size)
4837 true, // isolate_execinstr
4838 0x10000000, // rosegment_gap
4839 elfcpp::SHN_UNDEF, // small_common_shndx
4840 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
4841 0, // small_common_section_flags
4842 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
4843 NULL, // attributes_section
a67858e0 4844 NULL, // attributes_vendor
8d9743bd
MK		 4845 "_start", // entry_symbol_name
4846 32, // hash_entry_size
2e702c99
RM		 4847};
4848
4849template<>
4850const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info =
4851{
4852 32, // size
4853 false, // is_big_endian
4854 elfcpp::EM_X86_64, // machine_code
4855 false, // has_make_symbol
4856 false, // has_resolve
4857 true, // has_code_fill
4858 true, // is_default_stack_executable
4859 true, // can_icf_inline_merge_sections
4860 '\0', // wrap_char
4861 "/lib/ld-nacl-x86-64.so.1", // dynamic_linker
4862 0x20000, // default_text_segment_address
4863 0x10000, // abi_pagesize (overridable by -z max-page-size)
4864 0x10000, // common_pagesize (overridable by -z common-page-size)
4865 true, // isolate_execinstr
4866 0x10000000, // rosegment_gap
4867 elfcpp::SHN_UNDEF, // small_common_shndx
4868 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
4869 0, // small_common_section_flags
4870 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
4871 NULL, // attributes_section
a67858e0 4872 NULL, // attributes_vendor
8d9743bd
MK		 4873 "_start", // entry_symbol_name
4874 32, // hash_entry_size
2e702c99
RM		 4875};
4876
4877#define NACLMASK 0xe0 // 32-byte alignment mask.
4878
4879// The first entry in the PLT.
4880
4881template<int size>
4882const unsigned char
4883Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] =
4884{
4885 0xff, 0x35, // pushq contents of memory address
4886 0, 0, 0, 0, // replaced with address of .got + 8
4887 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11
4888 0, 0, 0, 0, // replaced with address of .got + 16
4889 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4890 0x4d, 0x01, 0xfb, // add %r15, %r11
4891 0x41, 0xff, 0xe3, // jmpq *%r11
4892
4893 // 9-byte nop sequence to pad out to the next 32-byte boundary.
dd0845d7 4894 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1)
2e702c99
RM		 4895
4896 // 32 bytes of nop to pad out to the standard size
4897 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4898 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4899 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4900 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4901 0x66, // excess data32 prefix
4902 0x90 // nop
4903};
4904
4905template<int size>
4906void
4907Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry(
4908 unsigned char* pov,
4909 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4910 typename elfcpp::Elf_types<size>::Elf_Addr plt_address)
4911{
4912 memcpy(pov, first_plt_entry, plt_entry_size);
4913 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
4914 (got_address + 8
4915 - (plt_address + 2 + 4)));
4916 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
4917 (got_address + 16
4918 - (plt_address + 9 + 4)));
4919}
4920
4921// Subsequent entries in the PLT.
4922
4923template<int size>
4924const unsigned char
4925Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] =
4926{
4927 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11
4928 0, 0, 0, 0, // replaced with address of symbol in .got
4929 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4930 0x4d, 0x01, 0xfb, // add %r15, %r11
4931 0x41, 0xff, 0xe3, // jmpq *%r11
4932
4933 // 15-byte nop sequence to pad out to the next 32-byte boundary.
4934 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4935 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4936
4937 // Lazy GOT entries point here (32-byte aligned).
4938 0x68, // pushq immediate
4939 0, 0, 0, 0, // replaced with index into relocation table
4940 0xe9, // jmp relative
4941 0, 0, 0, 0, // replaced with offset to start of .plt0
4942
4943 // 22 bytes of nop to pad out to the standard size.
4944 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4945 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4946 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax)
4947};
4948
4949template<int size>
4950unsigned int
4951Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry(
4952 unsigned char* pov,
4953 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
4954 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
4955 unsigned int got_offset,
4956 unsigned int plt_offset,
4957 unsigned int plt_index)
4958{
4959 memcpy(pov, plt_entry, plt_entry_size);
4960 elfcpp::Swap_unaligned<32, false>::writeval(pov + 3,
4961 (got_address + got_offset
4962 - (plt_address + plt_offset
4963 + 3 + 4)));
4964
4965 elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index);
4966 elfcpp::Swap_unaligned<32, false>::writeval(pov + 38,
4967 - (plt_offset + 38 + 4));
4968
4969 return 32;
4970}
4971
4972// The reserved TLSDESC entry in the PLT.
4973
4974template<int size>
4975const unsigned char
4976Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] =
4977{
4978 0xff, 0x35, // pushq x(%rip)
4979 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
4980 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11
4981 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
4982 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d
4983 0x4d, 0x01, 0xfb, // add %r15, %r11
4984 0x41, 0xff, 0xe3, // jmpq *%r11
4985
4986 // 41 bytes of nop to pad out to the standard size.
4987 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4988 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4989 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes
4990 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4991 0x66, 0x66, // excess data32 prefixes
4992 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1)
4993};
4994
4995template<int size>
4996void
4997Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry(
4998 unsigned char* pov,
4999 typename elfcpp::Elf_types<size>::Elf_Addr got_address,
5000 typename elfcpp::Elf_types<size>::Elf_Addr plt_address,
5001 typename elfcpp::Elf_types<size>::Elf_Addr got_base,
5002 unsigned int tlsdesc_got_offset,
5003 unsigned int plt_offset)
5004{
5005 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
5006 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
5007 (got_address + 8
5008 - (plt_address + plt_offset
5009 + 2 + 4)));
5010 elfcpp::Swap_unaligned<32, false>::writeval(pov + 9,
5011 (got_base
5012 + tlsdesc_got_offset
5013 - (plt_address + plt_offset
5014 + 9 + 4)));
5015}
5016
5017// The .eh_frame unwind information for the PLT.
5018
5019template<int size>
5020const unsigned char
5021Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] =
5022{
5023 0, 0, 0, 0, // Replaced with offset to .plt.
5024 0, 0, 0, 0, // Replaced with size of .plt.
5025 0, // Augmentation size.
5026 elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16.
5027 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
5028 elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24.
5029 elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64.
5030 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
5031 13, // Block length.
5032 elfcpp::DW_OP_breg7, 8, // Push %rsp + 8.
5033 elfcpp::DW_OP_breg16, 0, // Push %rip.
5034 elfcpp::DW_OP_const1u, 63, // Push 0x3f.
5035 elfcpp::DW_OP_and, // & (%rip & 0x3f).
5036 elfcpp::DW_OP_const1u, 37, // Push 0x25.
5037 elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25)
5038 elfcpp::DW_OP_lit3, // Push 3.
5039 elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3)
5040 elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8
5041 elfcpp::DW_CFA_nop, // Align to 32 bytes.
5042 elfcpp::DW_CFA_nop
5043};
5044
93f8221c
RM		 5045// Return a string used to fill a code section with nops.
5046// For NaCl, long NOPs are only valid if they do not cross
5047// bundle alignment boundaries, so keep it simple with one-byte NOPs.
5048template<int size>
5049std::string
5050Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const
5051{
5052 return std::string(length, static_cast<char>(0x90));
5053}
5054
2e702c99
RM		 5055// The selector for x86_64-nacl object files.
5056
5057template<int size>
5058class Target_selector_x86_64_nacl
5059 : public Target_selector_nacl<Target_selector_x86_64<size>,
5060 Target_x86_64_nacl<size> >
5061{
5062 public:
5063 Target_selector_x86_64_nacl()
5064 : Target_selector_nacl<Target_selector_x86_64<size>,
5065 Target_x86_64_nacl<size> >("x86-64",
5066 size == 64
5067 ? "elf64-x86-64-nacl"
5068 : "elf32-x86-64-nacl",
5069 size == 64
5070 ? "elf_x86_64_nacl"
5071 : "elf32_x86_64_nacl")
5072 { }
5073};
5074
5075Target_selector_x86_64_nacl<64> target_selector_x86_64;
5076Target_selector_x86_64_nacl<32> target_selector_x32;
2e30d253
ILT		 5077
5078} // End anonymous namespace.
GDB Binutils - Deliverables
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