projects / deliverable / binutils-gdb.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
* layout.cc (Layout::Layout): Initialize increase_relro_.
[deliverable/binutils-gdb.git] / gold / x86_64.cc
CommitLineData
2e30d253
ILT		 1// x86_64.cc -- x86_64 target support for gold.
2
6d03d481 3// Copyright 2006, 2007, 2008, 2009 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"
28#include "parameters.h"
29#include "reloc.h"
30#include "x86_64.h"
31#include "object.h"
32#include "symtab.h"
33#include "layout.h"
34#include "output.h"
12c0daef 35#include "copy-relocs.h"
2e30d253
ILT		 36#include "target.h"
37#include "target-reloc.h"
38#include "target-select.h"
e041f13d 39#include "tls.h"
36959681 40#include "freebsd.h"
f345227a 41#include "gc.h"
2e30d253
ILT		 42
43namespace
44{
45
46using namespace gold;
47
48class Output_data_plt_x86_64;
49
50// The x86_64 target class.
d61c17ea
ILT		 51// See the ABI at
52// http://www.x86-64.org/documentation/abi.pdf
53// TLS info comes from
54// http://people.redhat.com/drepper/tls.pdf
0ffd9845 55// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
2e30d253 56
36959681 57class Target_x86_64 : public Target_freebsd<64, false>
2e30d253
ILT		 58{
59 public:
e822f2b1
ILT		 60 // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures
61 // uses only Elf64_Rela relocation entries with explicit addends."
2e30d253
ILT		 62 typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
63
64 Target_x86_64()
36959681 65 : Target_freebsd<64, false>(&x86_64_info),
0ffd9845 66 got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL),
12c0daef 67 copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL),
edfbb029 68 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
2e30d253
ILT		 69 { }
70
8a5e3e08
ILT		 71 // Hook for a new output section.
72 void
73 do_new_output_section(Output_section*) const;
74
6d03d481
ST		 75 // Scan the relocations to look for symbol adjustments.
76 void
ad0f2072 77 gc_process_relocs(Symbol_table* symtab,
6d03d481
ST		 78 Layout* layout,
79 Sized_relobj<64, false>* object,
80 unsigned int data_shndx,
81 unsigned int sh_type,
82 const unsigned char* prelocs,
83 size_t reloc_count,
84 Output_section* output_section,
85 bool needs_special_offset_handling,
86 size_t local_symbol_count,
87 const unsigned char* plocal_symbols);
88
2e30d253
ILT		 89 // Scan the relocations to look for symbol adjustments.
90 void
ad0f2072 91 scan_relocs(Symbol_table* symtab,
2e30d253
ILT		 92 Layout* layout,
93 Sized_relobj<64, false>* object,
94 unsigned int data_shndx,
95 unsigned int sh_type,
96 const unsigned char* prelocs,
97 size_t reloc_count,
730cdc88
ILT		 98 Output_section* output_section,
99 bool needs_special_offset_handling,
2e30d253 100 size_t local_symbol_count,
730cdc88 101 const unsigned char* plocal_symbols);
2e30d253
ILT		 102
103 // Finalize the sections.
104 void
f59f41f3 105 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
2e30d253 106
4fb6c25d
ILT		 107 // Return the value to use for a dynamic which requires special
108 // treatment.
109 uint64_t
110 do_dynsym_value(const Symbol*) const;
111
2e30d253
ILT		 112 // Relocate a section.
113 void
114 relocate_section(const Relocate_info<64, false>*,
115 unsigned int sh_type,
116 const unsigned char* prelocs,
117 size_t reloc_count,
730cdc88
ILT		 118 Output_section* output_section,
119 bool needs_special_offset_handling,
2e30d253
ILT		 120 unsigned char* view,
121 elfcpp::Elf_types<64>::Elf_Addr view_address,
364c7fa5
ILT		 122 section_size_type view_size,
123 const Reloc_symbol_changes*);
2e30d253 124
6a74a719
ILT		 125 // Scan the relocs during a relocatable link.
126 void
ad0f2072 127 scan_relocatable_relocs(Symbol_table* symtab,
6a74a719
ILT		 128 Layout* layout,
129 Sized_relobj<64, false>* object,
130 unsigned int data_shndx,
131 unsigned int sh_type,
132 const unsigned char* prelocs,
133 size_t reloc_count,
134 Output_section* output_section,
135 bool needs_special_offset_handling,
136 size_t local_symbol_count,
137 const unsigned char* plocal_symbols,
138 Relocatable_relocs*);
139
140 // Relocate a section during a relocatable link.
141 void
142 relocate_for_relocatable(const Relocate_info<64, false>*,
143 unsigned int sh_type,
144 const unsigned char* prelocs,
145 size_t reloc_count,
146 Output_section* output_section,
147 off_t offset_in_output_section,
148 const Relocatable_relocs*,
149 unsigned char* view,
150 elfcpp::Elf_types<64>::Elf_Addr view_address,
151 section_size_type view_size,
152 unsigned char* reloc_view,
153 section_size_type reloc_view_size);
154
2e30d253
ILT		 155 // Return a string used to fill a code section with nops.
156 std::string
8851ecca 157 do_code_fill(section_size_type length) const;
2e30d253 158
9a2d6984
ILT		 159 // Return whether SYM is defined by the ABI.
160 bool
9c2d0ef9 161 do_is_defined_by_abi(const Symbol* sym) const
9a2d6984
ILT		 162 { return strcmp(sym->name(), "__tls_get_addr") == 0; }
163
364c7fa5
ILT		 164 // Adjust -fstack-split code which calls non-stack-split code.
165 void
166 do_calls_non_split(Relobj* object, unsigned int shndx,
167 section_offset_type fnoffset, section_size_type fnsize,
168 unsigned char* view, section_size_type view_size,
169 std::string* from, std::string* to) const;
170
96f2030e 171 // Return the size of the GOT section.
fe8718a4 172 section_size_type
96f2030e
ILT		 173 got_size()
174 {
175 gold_assert(this->got_ != NULL);
176 return this->got_->data_size();
177 }
178
2e30d253
ILT		 179 private:
180 // The class which scans relocations.
a036edd8 181 class Scan
2e30d253 182 {
a036edd8
ILT		 183 public:
184 Scan()
185 : issued_non_pic_error_(false)
186 { }
187
2e30d253 188 inline void
ad0f2072 189 local(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
2e30d253
ILT		 190 Sized_relobj<64, false>* object,
191 unsigned int data_shndx,
07f397ab 192 Output_section* output_section,
2e30d253
ILT		 193 const elfcpp::Rela<64, false>& reloc, unsigned int r_type,
194 const elfcpp::Sym<64, false>& lsym);
195
196 inline void
ad0f2072 197 global(Symbol_table* symtab, Layout* layout, Target_x86_64* target,
2e30d253
ILT		 198 Sized_relobj<64, false>* object,
199 unsigned int data_shndx,
07f397ab 200 Output_section* output_section,
2e30d253
ILT		 201 const elfcpp::Rela<64, false>& reloc, unsigned int r_type,
202 Symbol* gsym);
e041f13d 203
a036edd8 204 private:
e041f13d
ILT		 205 static void
206 unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type);
207
208 static void
209 unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type,
210 Symbol*);
a036edd8
ILT		 211
212 void
213 check_non_pic(Relobj*, unsigned int r_type);
214
215 // Whether we have issued an error about a non-PIC compilation.
216 bool issued_non_pic_error_;
2e30d253
ILT		 217 };
218
219 // The class which implements relocation.
220 class Relocate
221 {
222 public:
223 Relocate()
497897f9 224 : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false)
2e30d253
ILT		 225 { }
226
227 ~Relocate()
228 {
229 if (this->skip_call_tls_get_addr_)
230 {
231 // FIXME: This needs to specify the location somehow.
a0c4fb0a 232 gold_error(_("missing expected TLS relocation"));
2e30d253
ILT		 233 }
234 }
235
236 // Do a relocation. Return false if the caller should not issue
237 // any warnings about this relocation.
238 inline bool
031cdbed
ILT		 239 relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*,
240 size_t relnum, const elfcpp::Rela<64, false>&,
2e30d253
ILT		 241 unsigned int r_type, const Sized_symbol<64>*,
242 const Symbol_value<64>*,
243 unsigned char*, elfcpp::Elf_types<64>::Elf_Addr,
fe8718a4 244 section_size_type);
2e30d253
ILT		 245
246 private:
247 // Do a TLS relocation.
248 inline void
7bf1f802
ILT		 249 relocate_tls(const Relocate_info<64, false>*, Target_x86_64*,
250 size_t relnum, const elfcpp::Rela<64, false>&,
2e30d253
ILT		 251 unsigned int r_type, const Sized_symbol<64>*,
252 const Symbol_value<64>*,
fe8718a4
ILT		 253 unsigned char*, elfcpp::Elf_types<64>::Elf_Addr,
254 section_size_type);
2e30d253 255
c2b45e22 256 // Do a TLS General-Dynamic to Initial-Exec transition.
7bf1f802
ILT		 257 inline void
258 tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum,
259 Output_segment* tls_segment,
260 const elfcpp::Rela<64, false>&, unsigned int r_type,
261 elfcpp::Elf_types<64>::Elf_Addr value,
262 unsigned char* view,
c2b45e22 263 elfcpp::Elf_types<64>::Elf_Addr,
fe8718a4 264 section_size_type view_size);
7bf1f802 265
56622147
ILT		 266 // Do a TLS General-Dynamic to Local-Exec transition.
267 inline void
268 tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum,
2e30d253
ILT		 269 Output_segment* tls_segment,
270 const elfcpp::Rela<64, false>&, unsigned int r_type,
271 elfcpp::Elf_types<64>::Elf_Addr value,
272 unsigned char* view,
fe8718a4 273 section_size_type view_size);
2e30d253 274
c2b45e22
CC		 275 // Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
276 inline void
277 tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum,
278 Output_segment* tls_segment,
279 const elfcpp::Rela<64, false>&, unsigned int r_type,
280 elfcpp::Elf_types<64>::Elf_Addr value,
281 unsigned char* view,
282 elfcpp::Elf_types<64>::Elf_Addr,
283 section_size_type view_size);
284
285 // Do a TLSDESC-style General-Dynamic to Local-Exec transition.
286 inline void
287 tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum,
288 Output_segment* tls_segment,
289 const elfcpp::Rela<64, false>&, unsigned int r_type,
290 elfcpp::Elf_types<64>::Elf_Addr value,
291 unsigned char* view,
292 section_size_type view_size);
293
56622147 294 // Do a TLS Local-Dynamic to Local-Exec transition.
2e30d253 295 inline void
56622147 296 tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum,
2e30d253
ILT		 297 Output_segment* tls_segment,
298 const elfcpp::Rela<64, false>&, unsigned int r_type,
299 elfcpp::Elf_types<64>::Elf_Addr value,
300 unsigned char* view,
fe8718a4 301 section_size_type view_size);
2e30d253 302
56622147
ILT		 303 // Do a TLS Initial-Exec to Local-Exec transition.
304 static inline void
305 tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum,
72ec2876
ILT		 306 Output_segment* tls_segment,
307 const elfcpp::Rela<64, false>&, unsigned int r_type,
308 elfcpp::Elf_types<64>::Elf_Addr value,
309 unsigned char* view,
fe8718a4 310 section_size_type view_size);
2e30d253
ILT		 311
312 // This is set if we should skip the next reloc, which should be a
313 // PLT32 reloc against ___tls_get_addr.
314 bool skip_call_tls_get_addr_;
497897f9
ILT		 315
316 // This is set if we see a relocation which could load the address
317 // of the TLS block. Whether we see such a relocation determines
318 // how we handle the R_X86_64_DTPOFF32 relocation, which is used
319 // in debugging sections.
320 bool saw_tls_block_reloc_;
2e30d253
ILT		 321 };
322
6a74a719
ILT		 323 // A class which returns the size required for a relocation type,
324 // used while scanning relocs during a relocatable link.
325 class Relocatable_size_for_reloc
326 {
327 public:
328 unsigned int
329 get_size_for_reloc(unsigned int, Relobj*);
330 };
331
2e30d253
ILT		 332 // Adjust TLS relocation type based on the options and whether this
333 // is a local symbol.
e041f13d 334 static tls::Tls_optimization
2e30d253
ILT		 335 optimize_tls_reloc(bool is_final, int r_type);
336
337 // Get the GOT section, creating it if necessary.
338 Output_data_got<64, false>*
339 got_section(Symbol_table*, Layout*);
340
96f2030e
ILT		 341 // Get the GOT PLT section.
342 Output_data_space*
343 got_plt_section() const
344 {
345 gold_assert(this->got_plt_ != NULL);
346 return this->got_plt_;
347 }
348
c2b45e22
CC		 349 // Create the PLT section.
350 void
351 make_plt_section(Symbol_table* symtab, Layout* layout);
352
2e30d253
ILT		 353 // Create a PLT entry for a global symbol.
354 void
355 make_plt_entry(Symbol_table*, Layout*, Symbol*);
356
9fa33bee 357 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 358 void
359 define_tls_base_symbol(Symbol_table*, Layout*);
360
c2b45e22
CC		 361 // Create the reserved PLT and GOT entries for the TLS descriptor resolver.
362 void
363 reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout);
364
31d60480
ILT		 365 // Create a GOT entry for the TLS module index.
366 unsigned int
367 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
368 Sized_relobj<64, false>* object);
369
2e30d253
ILT		 370 // Get the PLT section.
371 Output_data_plt_x86_64*
372 plt_section() const
373 {
374 gold_assert(this->plt_ != NULL);
375 return this->plt_;
376 }
377
378 // Get the dynamic reloc section, creating it if necessary.
379 Reloc_section*
0ffd9845 380 rela_dyn_section(Layout*);
2e30d253 381
12c0daef 382 // Add a potential copy relocation.
2e30d253 383 void
ef9beddf
ILT		 384 copy_reloc(Symbol_table* symtab, Layout* layout,
385 Sized_relobj<64, false>* object,
12c0daef
ILT		 386 unsigned int shndx, Output_section* output_section,
387 Symbol* sym, const elfcpp::Rela<64, false>& reloc)
388 {
389 this->copy_relocs_.copy_reloc(symtab, layout,
390 symtab->get_sized_symbol<64>(sym),
391 object, shndx, output_section,
392 reloc, this->rela_dyn_section(layout));
393 }
2e30d253
ILT		 394
395 // Information about this specific target which we pass to the
396 // general Target structure.
397 static const Target::Target_info x86_64_info;
398
0a65a3a7
CC		 399 enum Got_type
400 {
401 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
402 GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset
403 GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair
404 GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair
405 };
406
2e30d253
ILT		 407 // The GOT section.
408 Output_data_got<64, false>* got_;
409 // The PLT section.
410 Output_data_plt_x86_64* plt_;
411 // The GOT PLT section.
412 Output_data_space* got_plt_;
413 // The dynamic reloc section.
0ffd9845 414 Reloc_section* rela_dyn_;
2e30d253 415 // Relocs saved to avoid a COPY reloc.
12c0daef 416 Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_;
2e30d253
ILT		 417 // Space for variables copied with a COPY reloc.
418 Output_data_space* dynbss_;
c2b45e22 419 // Offset of the GOT entry for the TLS module index.
31d60480 420 unsigned int got_mod_index_offset_;
edfbb029
CC		 421 // True if the _TLS_MODULE_BASE_ symbol has been defined.
422 bool tls_base_symbol_defined_;
2e30d253
ILT		 423};
424
425const Target::Target_info Target_x86_64::x86_64_info =
426{
427 64, // size
428 false, // is_big_endian
429 elfcpp::EM_X86_64, // machine_code
430 false, // has_make_symbol
431 false, // has_resolve
432 true, // has_code_fill
35cdfc9a 433 true, // is_default_stack_executable
0864d551 434 '\0', // wrap_char
2e30d253 435 "/lib/ld64.so.1", // program interpreter
0c5e9c22 436 0x400000, // default_text_segment_address
cd72c291 437 0x1000, // abi_pagesize (overridable by -z max-page-size)
8a5e3e08
ILT		 438 0x1000, // common_pagesize (overridable by -z common-page-size)
439 elfcpp::SHN_UNDEF, // small_common_shndx
440 elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx
441 0, // small_common_section_flags
05a352e6
DK		 442 elfcpp::SHF_X86_64_LARGE, // large_common_section_flags
443 NULL, // attributes_section
444 NULL // attributes_vendor
2e30d253
ILT		 445};
446
8a5e3e08
ILT		 447// This is called when a new output section is created. This is where
448// we handle the SHF_X86_64_LARGE.
449
450void
451Target_x86_64::do_new_output_section(Output_section *os) const
452{
453 if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0)
454 os->set_is_large_section();
455}
456
2e30d253
ILT		 457// Get the GOT section, creating it if necessary.
458
459Output_data_got<64, false>*
460Target_x86_64::got_section(Symbol_table* symtab, Layout* layout)
461{
462 if (this->got_ == NULL)
463 {
464 gold_assert(symtab != NULL && layout != NULL);
465
466 this->got_ = new Output_data_got<64, false>();
467
9f1d377b
ILT		 468 Output_section* os;
469 os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
470 (elfcpp::SHF_ALLOC
471 | elfcpp::SHF_WRITE),
1a2dff53
ILT		 472 this->got_, false, true, true,
473 false);
2e30d253 474
7d9e3d98 475 this->got_plt_ = new Output_data_space(8, "** GOT PLT");
1a2dff53 476 os = layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
9f1d377b
ILT		 477 (elfcpp::SHF_ALLOC
478 | elfcpp::SHF_WRITE),
1a2dff53
ILT		 479 this->got_plt_, false, false,
480 false, true);
2e30d253
ILT		 481
482 // The first three entries are reserved.
27bc2bce 483 this->got_plt_->set_current_data_size(3 * 8);
2e30d253 484
1a2dff53
ILT		 485 // Those bytes can go into the relro segment.
486 layout->increase_relro(3 * 8);
487
2e30d253 488 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
9b07f471 489 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
99fff23b 490 Symbol_table::PREDEFINED,
2e30d253
ILT		 491 this->got_plt_,
492 0, 0, elfcpp::STT_OBJECT,
493 elfcpp::STB_LOCAL,
494 elfcpp::STV_HIDDEN, 0,
495 false, false);
496 }
497
498 return this->got_;
499}
500
501// Get the dynamic reloc section, creating it if necessary.
502
503Target_x86_64::Reloc_section*
0ffd9845 504Target_x86_64::rela_dyn_section(Layout* layout)
2e30d253 505{
0ffd9845 506 if (this->rela_dyn_ == NULL)
2e30d253
ILT		 507 {
508 gold_assert(layout != NULL);
d98bc257 509 this->rela_dyn_ = new Reloc_section(parameters->options().combreloc());
2e30d253 510 layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA,
1a2dff53
ILT		 511 elfcpp::SHF_ALLOC, this->rela_dyn_, true,
512 false, false, false);
2e30d253 513 }
0ffd9845 514 return this->rela_dyn_;
2e30d253
ILT		 515}
516
517// A class to handle the PLT data.
518
519class Output_data_plt_x86_64 : public Output_section_data
520{
521 public:
522 typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section;
523
c2b45e22
CC		 524 Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*,
525 Output_data_space*);
2e30d253
ILT		 526
527 // Add an entry to the PLT.
528 void
529 add_entry(Symbol* gsym);
530
c2b45e22
CC		 531 // Add the reserved TLSDESC_PLT entry to the PLT.
532 void
533 reserve_tlsdesc_entry(unsigned int got_offset)
534 { this->tlsdesc_got_offset_ = got_offset; }
535
536 // Return true if a TLSDESC_PLT entry has been reserved.
537 bool
538 has_tlsdesc_entry() const
539 { return this->tlsdesc_got_offset_ != -1U; }
540
541 // Return the GOT offset for the reserved TLSDESC_PLT entry.
542 unsigned int
543 get_tlsdesc_got_offset() const
544 { return this->tlsdesc_got_offset_; }
545
546 // Return the offset of the reserved TLSDESC_PLT entry.
547 unsigned int
548 get_tlsdesc_plt_offset() const
549 { return (this->count_ + 1) * plt_entry_size; }
550
2e30d253
ILT		 551 // Return the .rel.plt section data.
552 const Reloc_section*
553 rel_plt() const
554 { return this->rel_; }
555
556 protected:
557 void
558 do_adjust_output_section(Output_section* os);
559
7d9e3d98
ILT		 560 // Write to a map file.
561 void
562 do_print_to_mapfile(Mapfile* mapfile) const
563 { mapfile->print_output_data(this, _("** PLT")); }
564
2e30d253
ILT		 565 private:
566 // The size of an entry in the PLT.
567 static const int plt_entry_size = 16;
568
569 // The first entry in the PLT.
570 // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same
571 // procedure linkage table for both programs and shared objects."
572 static unsigned char first_plt_entry[plt_entry_size];
573
574 // Other entries in the PLT for an executable.
575 static unsigned char plt_entry[plt_entry_size];
576
c2b45e22
CC		 577 // The reserved TLSDESC entry in the PLT for an executable.
578 static unsigned char tlsdesc_plt_entry[plt_entry_size];
579
2e30d253
ILT		 580 // Set the final size.
581 void
c2b45e22 582 set_final_data_size();
2e30d253
ILT		 583
584 // Write out the PLT data.
585 void
586 do_write(Output_file*);
587
588 // The reloc section.
589 Reloc_section* rel_;
c2b45e22
CC		 590 // The .got section.
591 Output_data_got<64, false>* got_;
2e30d253
ILT		 592 // The .got.plt section.
593 Output_data_space* got_plt_;
594 // The number of PLT entries.
595 unsigned int count_;
c2b45e22
CC		 596 // Offset of the reserved TLSDESC_GOT entry when needed.
597 unsigned int tlsdesc_got_offset_;
2e30d253
ILT		 598};
599
600// Create the PLT section. The ordinary .got section is an argument,
601// since we need to refer to the start. We also create our own .got
602// section just for PLT entries.
603
604Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout,
c2b45e22 605 Output_data_got<64, false>* got,
2e30d253 606 Output_data_space* got_plt)
c2b45e22
CC		 607 : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0),
608 tlsdesc_got_offset_(-1U)
2e30d253 609{
d98bc257 610 this->rel_ = new Reloc_section(false);
2e30d253 611 layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA,
1a2dff53
ILT		 612 elfcpp::SHF_ALLOC, this->rel_, true,
613 false, false, false);
2e30d253
ILT		 614}
615
616void
617Output_data_plt_x86_64::do_adjust_output_section(Output_section* os)
618{
b0481b0b 619 os->set_entsize(plt_entry_size);
2e30d253
ILT		 620}
621
622// Add an entry to the PLT.
623
624void
625Output_data_plt_x86_64::add_entry(Symbol* gsym)
626{
627 gold_assert(!gsym->has_plt_offset());
628
629 // Note that when setting the PLT offset we skip the initial
630 // reserved PLT entry.
631 gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
632
633 ++this->count_;
634
fe8718a4 635 section_offset_type got_offset = this->got_plt_->current_data_size();
2e30d253
ILT		 636
637 // Every PLT entry needs a GOT entry which points back to the PLT
638 // entry (this will be changed by the dynamic linker, normally
639 // lazily when the function is called).
27bc2bce 640 this->got_plt_->set_current_data_size(got_offset + 8);
2e30d253
ILT		 641
642 // Every PLT entry needs a reloc.
643 gsym->set_needs_dynsym_entry();
644 this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_,
645 got_offset, 0);
646
647 // Note that we don't need to save the symbol. The contents of the
648 // PLT are independent of which symbols are used. The symbols only
649 // appear in the relocations.
650}
651
c2b45e22
CC		 652// Set the final size.
653void
654Output_data_plt_x86_64::set_final_data_size()
655{
656 unsigned int count = this->count_;
657 if (this->has_tlsdesc_entry())
658 ++count;
659 this->set_data_size((count + 1) * plt_entry_size);
660}
661
2e30d253
ILT		 662// The first entry in the PLT for an executable.
663
664unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] =
665{
666 // From AMD64 ABI Draft 0.98, page 76
667 0xff, 0x35, // pushq contents of memory address
2e30d253 668 0, 0, 0, 0, // replaced with address of .got + 8
78d911fd
ILT		 669 0xff, 0x25, // jmp indirect
670 0, 0, 0, 0, // replaced with address of .got + 16
2e30d253
ILT		 671 0x90, 0x90, 0x90, 0x90 // noop (x4)
672};
673
674// Subsequent entries in the PLT for an executable.
675
676unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] =
677{
678 // From AMD64 ABI Draft 0.98, page 76
679 0xff, 0x25, // jmpq indirect
680 0, 0, 0, 0, // replaced with address of symbol in .got
681 0x68, // pushq immediate
682 0, 0, 0, 0, // replaced with offset into relocation table
683 0xe9, // jmpq relative
684 0, 0, 0, 0 // replaced with offset to start of .plt
685};
686
c2b45e22
CC		 687// The reserved TLSDESC entry in the PLT for an executable.
688
689unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] =
690{
691 // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32
692 // and AMD64/EM64T", Version 0.9.4 (2005-10-10).
693 0xff, 0x35, // pushq x(%rip)
694 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8)
695 0xff, 0x25, // jmpq *y(%rip)
696 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry
697 0x0f, 0x1f, // nop
698 0x40, 0
699};
700
2e30d253
ILT		 701// Write out the PLT. This uses the hand-coded instructions above,
702// and adjusts them as needed. This is specified by the AMD64 ABI.
703
704void
705Output_data_plt_x86_64::do_write(Output_file* of)
706{
2ea97941 707 const off_t offset = this->offset();
fe8718a4
ILT		 708 const section_size_type oview_size =
709 convert_to_section_size_type(this->data_size());
2ea97941 710 unsigned char* const oview = of->get_output_view(offset, oview_size);
2e30d253
ILT		 711
712 const off_t got_file_offset = this->got_plt_->offset();
fe8718a4
ILT		 713 const section_size_type got_size =
714 convert_to_section_size_type(this->got_plt_->data_size());
2e30d253
ILT		 715 unsigned char* const got_view = of->get_output_view(got_file_offset,
716 got_size);
717
718 unsigned char* pov = oview;
719
c2b45e22 720 // The base address of the .plt section.
a984ee1d 721 elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address();
c2b45e22 722 // The base address of the .got section.
a984ee1d 723 elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address();
c2b45e22
CC		 724 // The base address of the PLT portion of the .got section,
725 // which is where the GOT pointer will point, and where the
726 // three reserved GOT entries are located.
a984ee1d 727 elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address();
2e30d253
ILT		 728
729 memcpy(pov, first_plt_entry, plt_entry_size);
78d911fd 730 // We do a jmp relative to the PC at the end of this instruction.
a984ee1d
ILT		 731 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
732 (got_address + 8
733 - (plt_address + 6)));
734 elfcpp::Swap<32, false>::writeval(pov + 8,
735 (got_address + 16
736 - (plt_address + 12)));
2e30d253
ILT		 737 pov += plt_entry_size;
738
739 unsigned char* got_pov = got_view;
740
741 memset(got_pov, 0, 24);
742 got_pov += 24;
743
744 unsigned int plt_offset = plt_entry_size;
745 unsigned int got_offset = 24;
746 const unsigned int count = this->count_;
747 for (unsigned int plt_index = 0;
748 plt_index < count;
749 ++plt_index,
750 pov += plt_entry_size,
751 got_pov += 8,
752 plt_offset += plt_entry_size,
753 got_offset += 8)
754 {
755 // Set and adjust the PLT entry itself.
756 memcpy(pov, plt_entry, plt_entry_size);
78d911fd
ILT		 757 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
758 (got_address + got_offset
759 - (plt_address + plt_offset
760 + 6)));
2e30d253
ILT		 761
762 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index);
763 elfcpp::Swap<32, false>::writeval(pov + 12,
764 - (plt_offset + plt_entry_size));
765
766 // Set the entry in the GOT.
767 elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6);
768 }
769
c2b45e22
CC		 770 if (this->has_tlsdesc_entry())
771 {
772 // Set and adjust the reserved TLSDESC PLT entry.
773 unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset();
774 memcpy(pov, tlsdesc_plt_entry, plt_entry_size);
775 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
776 (got_address + 8
777 - (plt_address + plt_offset
778 + 6)));
779 elfcpp::Swap_unaligned<32, false>::writeval(pov + 8,
780 (got_base
781 + tlsdesc_got_offset
782 - (plt_address + plt_offset
783 + 12)));
784 pov += plt_entry_size;
785 }
786
fe8718a4
ILT		 787 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
788 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
2e30d253 789
2ea97941 790 of->write_output_view(offset, oview_size, oview);
2e30d253
ILT		 791 of->write_output_view(got_file_offset, got_size, got_view);
792}
793
c2b45e22 794// Create the PLT section.
2e30d253
ILT		 795
796void
c2b45e22 797Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout)
2e30d253 798{
2e30d253
ILT		 799 if (this->plt_ == NULL)
800 {
801 // Create the GOT sections first.
802 this->got_section(symtab, layout);
803
c2b45e22
CC		 804 this->plt_ = new Output_data_plt_x86_64(layout, this->got_,
805 this->got_plt_);
2e30d253
ILT		 806 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
807 (elfcpp::SHF_ALLOC
808 | elfcpp::SHF_EXECINSTR),
1a2dff53 809 this->plt_, false, false, false, false);
2e30d253 810 }
c2b45e22
CC		 811}
812
813// Create a PLT entry for a global symbol.
814
815void
816Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout,
817 Symbol* gsym)
818{
819 if (gsym->has_plt_offset())
820 return;
821
822 if (this->plt_ == NULL)
823 this->make_plt_section(symtab, layout);
2e30d253
ILT		 824
825 this->plt_->add_entry(gsym);
826}
827
9fa33bee 828// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 829
830void
831Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout)
832{
833 if (this->tls_base_symbol_defined_)
834 return;
835
836 Output_segment* tls_segment = layout->tls_segment();
837 if (tls_segment != NULL)
838 {
183fd0e3 839 bool is_exec = parameters->options().output_is_executable();
edfbb029 840 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 841 Symbol_table::PREDEFINED,
edfbb029
CC		 842 tls_segment, 0, 0,
843 elfcpp::STT_TLS,
844 elfcpp::STB_LOCAL,
845 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 846 (is_exec
847 ? Symbol::SEGMENT_END
848 : Symbol::SEGMENT_START),
849 true);
edfbb029
CC		 850 }
851 this->tls_base_symbol_defined_ = true;
852}
853
c2b45e22
CC		 854// Create the reserved PLT and GOT entries for the TLS descriptor resolver.
855
856void
857Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab,
858 Layout* layout)
859{
860 if (this->plt_ == NULL)
861 this->make_plt_section(symtab, layout);
862
863 if (!this->plt_->has_tlsdesc_entry())
864 {
865 // Allocate the TLSDESC_GOT entry.
866 Output_data_got<64, false>* got = this->got_section(symtab, layout);
867 unsigned int got_offset = got->add_constant(0);
868
869 // Allocate the TLSDESC_PLT entry.
870 this->plt_->reserve_tlsdesc_entry(got_offset);
871 }
872}
873
31d60480
ILT		 874// Create a GOT entry for the TLS module index.
875
876unsigned int
877Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
878 Sized_relobj<64, false>* object)
879{
880 if (this->got_mod_index_offset_ == -1U)
881 {
882 gold_assert(symtab != NULL && layout != NULL && object != NULL);
883 Reloc_section* rela_dyn = this->rela_dyn_section(layout);
884 Output_data_got<64, false>* got = this->got_section(symtab, layout);
885 unsigned int got_offset = got->add_constant(0);
886 rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got,
887 got_offset, 0);
009a67a2 888 got->add_constant(0);
31d60480
ILT		 889 this->got_mod_index_offset_ = got_offset;
890 }
891 return this->got_mod_index_offset_;
892}
893
2e30d253
ILT		 894// Optimize the TLS relocation type based on what we know about the
895// symbol. IS_FINAL is true if the final address of this symbol is
896// known at link time.
897
e041f13d 898tls::Tls_optimization
2e30d253
ILT		 899Target_x86_64::optimize_tls_reloc(bool is_final, int r_type)
900{
2e30d253
ILT		 901 // If we are generating a shared library, then we can't do anything
902 // in the linker.
8851ecca 903 if (parameters->options().shared())
e041f13d 904 return tls::TLSOPT_NONE;
2e30d253
ILT		 905
906 switch (r_type)
907 {
908 case elfcpp::R_X86_64_TLSGD:
e041f13d
ILT		 909 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
910 case elfcpp::R_X86_64_TLSDESC_CALL:
911 // These are General-Dynamic which permits fully general TLS
2e30d253
ILT		 912 // access. Since we know that we are generating an executable,
913 // we can convert this to Initial-Exec. If we also know that
914 // this is a local symbol, we can further switch to Local-Exec.
915 if (is_final)
e041f13d
ILT		 916 return tls::TLSOPT_TO_LE;
917 return tls::TLSOPT_TO_IE;
2e30d253 918
d61c17ea 919 case elfcpp::R_X86_64_TLSLD:
2e30d253
ILT		 920 // This is Local-Dynamic, which refers to a local symbol in the
921 // dynamic TLS block. Since we know that we generating an
922 // executable, we can switch to Local-Exec.
e041f13d 923 return tls::TLSOPT_TO_LE;
2e30d253 924
0ffd9845 925 case elfcpp::R_X86_64_DTPOFF32:
0ffd9845
ILT		 926 case elfcpp::R_X86_64_DTPOFF64:
927 // Another Local-Dynamic reloc.
e041f13d 928 return tls::TLSOPT_TO_LE;
0ffd9845 929
d61c17ea 930 case elfcpp::R_X86_64_GOTTPOFF:
2e30d253
ILT		 931 // These are Initial-Exec relocs which get the thread offset
932 // from the GOT. If we know that we are linking against the
933 // local symbol, we can switch to Local-Exec, which links the
934 // thread offset into the instruction.
935 if (is_final)
e041f13d
ILT		 936 return tls::TLSOPT_TO_LE;
937 return tls::TLSOPT_NONE;
2e30d253 938
d61c17ea 939 case elfcpp::R_X86_64_TPOFF32:
2e30d253
ILT		 940 // When we already have Local-Exec, there is nothing further we
941 // can do.
e041f13d 942 return tls::TLSOPT_NONE;
2e30d253
ILT		 943
944 default:
945 gold_unreachable();
946 }
2e30d253
ILT		 947}
948
e041f13d
ILT		 949// Report an unsupported relocation against a local symbol.
950
951void
952Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object,
953 unsigned int r_type)
954{
75f2446e
ILT		 955 gold_error(_("%s: unsupported reloc %u against local symbol"),
956 object->name().c_str(), r_type);
e041f13d
ILT		 957}
958
a036edd8
ILT		 959// We are about to emit a dynamic relocation of type R_TYPE. If the
960// dynamic linker does not support it, issue an error. The GNU linker
961// only issues a non-PIC error for an allocated read-only section.
962// Here we know the section is allocated, but we don't know that it is
963// read-only. But we check for all the relocation types which the
964// glibc dynamic linker supports, so it seems appropriate to issue an
965// error even if the section is not read-only.
966
967void
968Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type)
969{
970 switch (r_type)
971 {
972 // These are the relocation types supported by glibc for x86_64.
973 case elfcpp::R_X86_64_RELATIVE:
974 case elfcpp::R_X86_64_GLOB_DAT:
975 case elfcpp::R_X86_64_JUMP_SLOT:
976 case elfcpp::R_X86_64_DTPMOD64:
977 case elfcpp::R_X86_64_DTPOFF64:
978 case elfcpp::R_X86_64_TPOFF64:
979 case elfcpp::R_X86_64_64:
980 case elfcpp::R_X86_64_32:
981 case elfcpp::R_X86_64_PC32:
982 case elfcpp::R_X86_64_COPY:
983 return;
984
985 default:
986 // This prevents us from issuing more than one error per reloc
987 // section. But we can still wind up issuing more than one
988 // error per object file.
989 if (this->issued_non_pic_error_)
990 return;
33aea2fd 991 gold_assert(parameters->options().output_is_position_independent());
a036edd8
ILT		 992 object->error(_("requires unsupported dynamic reloc; "
993 "recompile with -fPIC"));
994 this->issued_non_pic_error_ = true;
995 return;
996
997 case elfcpp::R_X86_64_NONE:
998 gold_unreachable();
999 }
1000}
1001
2e30d253
ILT		 1002// Scan a relocation for a local symbol.
1003
1004inline void
ad0f2072 1005Target_x86_64::Scan::local(Symbol_table* symtab,
d61c17ea
ILT		 1006 Layout* layout,
1007 Target_x86_64* target,
1008 Sized_relobj<64, false>* object,
0ffd9845 1009 unsigned int data_shndx,
4f4c5f80 1010 Output_section* output_section,
0ffd9845 1011 const elfcpp::Rela<64, false>& reloc,
d61c17ea 1012 unsigned int r_type,
7bf1f802 1013 const elfcpp::Sym<64, false>& lsym)
2e30d253
ILT		 1014{
1015 switch (r_type)
1016 {
1017 case elfcpp::R_X86_64_NONE:
e822f2b1
ILT		 1018 case elfcpp::R_386_GNU_VTINHERIT:
1019 case elfcpp::R_386_GNU_VTENTRY:
2e30d253
ILT		 1020 break;
1021
1022 case elfcpp::R_X86_64_64:
d61c6bd4 1023 // If building a shared library (or a position-independent
dceae3c1
ILT		 1024 // executable), we need to create a dynamic relocation for this
1025 // location. The relocation applied at link time will apply the
1026 // link-time value, so we flag the location with an
1027 // R_X86_64_RELATIVE relocation so the dynamic loader can
d61c6bd4 1028 // relocate it easily.
8851ecca 1029 if (parameters->options().output_is_position_independent())
d61c6bd4 1030 {
e8c846c3 1031 unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
d61c6bd4 1032 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
e8c846c3
ILT		 1033 rela_dyn->add_local_relative(object, r_sym,
1034 elfcpp::R_X86_64_RELATIVE,
1035 output_section, data_shndx,
1036 reloc.get_r_offset(),
1037 reloc.get_r_addend());
d61c6bd4
ILT		 1038 }
1039 break;
1040
2e30d253
ILT		 1041 case elfcpp::R_X86_64_32:
1042 case elfcpp::R_X86_64_32S:
1043 case elfcpp::R_X86_64_16:
1044 case elfcpp::R_X86_64_8:
96f2030e 1045 // If building a shared library (or a position-independent
dceae3c1
ILT		 1046 // executable), we need to create a dynamic relocation for this
1047 // location. We can't use an R_X86_64_RELATIVE relocation
1048 // because that is always a 64-bit relocation.
8851ecca 1049 if (parameters->options().output_is_position_independent())
96f2030e 1050 {
a036edd8
ILT		 1051 this->check_non_pic(object, r_type);
1052
96f2030e 1053 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
d491d34e 1054 unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
dceae3c1 1055 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 1056 rela_dyn->add_local(object, r_sym, r_type, output_section,
1057 data_shndx, reloc.get_r_offset(),
1058 reloc.get_r_addend());
dceae3c1
ILT		 1059 else
1060 {
1061 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 1062 unsigned int shndx = lsym.get_st_shndx();
1063 bool is_ordinary;
1064 shndx = object->adjust_sym_shndx(r_sym, shndx,
1065 &is_ordinary);
1066 if (!is_ordinary)
1067 object->error(_("section symbol %u has bad shndx %u"),
1068 r_sym, shndx);
1069 else
1070 rela_dyn->add_local_section(object, shndx,
1071 r_type, output_section,
1072 data_shndx, reloc.get_r_offset(),
1073 reloc.get_r_addend());
dceae3c1 1074 }
96f2030e 1075 }
2e30d253
ILT		 1076 break;
1077
1078 case elfcpp::R_X86_64_PC64:
1079 case elfcpp::R_X86_64_PC32:
1080 case elfcpp::R_X86_64_PC16:
1081 case elfcpp::R_X86_64_PC8:
1082 break;
1083
f389a824
ILT		 1084 case elfcpp::R_X86_64_PLT32:
1085 // Since we know this is a local symbol, we can handle this as a
1086 // PC32 reloc.
1087 break;
1088
fdc2f80f 1089 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 1090 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 1091 case elfcpp::R_X86_64_GOTPC64:
1092 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 1093 // We need a GOT section.
1094 target->got_section(symtab, layout);
ee9e9e86
ILT		 1095 // For PLTOFF64, we'd normally want a PLT section, but since we
1096 // know this is a local symbol, no PLT is needed.
2e30d253
ILT		 1097 break;
1098
0ffd9845
ILT		 1099 case elfcpp::R_X86_64_GOT64:
1100 case elfcpp::R_X86_64_GOT32:
1101 case elfcpp::R_X86_64_GOTPCREL64:
1102 case elfcpp::R_X86_64_GOTPCREL:
ee9e9e86 1103 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845
ILT		 1104 {
1105 // The symbol requires a GOT entry.
1106 Output_data_got<64, false>* got = target->got_section(symtab, layout);
1107 unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
0a65a3a7 1108 if (got->add_local(object, r_sym, GOT_TYPE_STANDARD))
0ffd9845
ILT		 1109 {
1110 // If we are generating a shared object, we need to add a
7bf1f802 1111 // dynamic relocation for this symbol's GOT entry.
8851ecca 1112 if (parameters->options().output_is_position_independent())
0ffd9845
ILT		 1113 {
1114 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
7bf1f802
ILT		 1115 // R_X86_64_RELATIVE assumes a 64-bit relocation.
1116 if (r_type != elfcpp::R_X86_64_GOT32)
0a65a3a7
CC		 1117 rela_dyn->add_local_relative(
1118 object, r_sym, elfcpp::R_X86_64_RELATIVE, got,
1119 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
7bf1f802 1120 else
dceae3c1 1121 {
a036edd8
ILT		 1122 this->check_non_pic(object, r_type);
1123
dceae3c1 1124 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
0a65a3a7
CC		 1125 rela_dyn->add_local(
1126 object, r_sym, r_type, got,
1127 object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0);
dceae3c1 1128 }
0ffd9845
ILT		 1129 }
1130 }
ee9e9e86
ILT		 1131 // For GOTPLT64, we'd normally want a PLT section, but since
1132 // we know this is a local symbol, no PLT is needed.
0ffd9845
ILT		 1133 }
1134 break;
1135
2e30d253
ILT		 1136 case elfcpp::R_X86_64_COPY:
1137 case elfcpp::R_X86_64_GLOB_DAT:
1138 case elfcpp::R_X86_64_JUMP_SLOT:
1139 case elfcpp::R_X86_64_RELATIVE:
d61c17ea 1140 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 1141 case elfcpp::R_X86_64_TPOFF64:
2e30d253 1142 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 1143 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 1144 gold_error(_("%s: unexpected reloc %u in object file"),
1145 object->name().c_str(), r_type);
2e30d253
ILT		 1146 break;
1147
d61c17ea 1148 // These are initial tls relocs, which are expected when linking
56622147
ILT		 1149 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
1150 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 1151 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 1152 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 1153 case elfcpp::R_X86_64_DTPOFF32:
1154 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 1155 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
1156 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253 1157 {
8851ecca 1158 bool output_is_shared = parameters->options().shared();
e041f13d
ILT		 1159 const tls::Tls_optimization optimized_type
1160 = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type);
2e30d253
ILT		 1161 switch (r_type)
1162 {
56622147 1163 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 1164 if (optimized_type == tls::TLSOPT_NONE)
1165 {
1166 // Create a pair of GOT entries for the module index and
1167 // dtv-relative offset.
1168 Output_data_got<64, false>* got
1169 = target->got_section(symtab, layout);
1170 unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
d491d34e
ILT		 1171 unsigned int shndx = lsym.get_st_shndx();
1172 bool is_ordinary;
1173 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
1174 if (!is_ordinary)
1175 object->error(_("local symbol %u has bad shndx %u"),
1176 r_sym, shndx);
1177 else
1178 got->add_local_pair_with_rela(object, r_sym,
1179 shndx,
1180 GOT_TYPE_TLS_PAIR,
1181 target->rela_dyn_section(layout),
1182 elfcpp::R_X86_64_DTPMOD64, 0);
7bf1f802
ILT		 1183 }
1184 else if (optimized_type != tls::TLSOPT_TO_LE)
1185 unsupported_reloc_local(object, r_type);
1186 break;
1187
56622147 1188 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
edfbb029 1189 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 1190 if (optimized_type == tls::TLSOPT_NONE)
1191 {
1192 // Create reserved PLT and GOT entries for the resolver.
1193 target->reserve_tlsdesc_entries(symtab, layout);
1194
1195 // Generate a double GOT entry with an R_X86_64_TLSDESC reloc.
1196 Output_data_got<64, false>* got
1197 = target->got_section(symtab, layout);
1198 unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
d491d34e
ILT		 1199 unsigned int shndx = lsym.get_st_shndx();
1200 bool is_ordinary;
1201 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
1202 if (!is_ordinary)
1203 object->error(_("local symbol %u has bad shndx %u"),
1204 r_sym, shndx);
1205 else
1206 got->add_local_pair_with_rela(object, r_sym,
1207 shndx,
1208 GOT_TYPE_TLS_DESC,
1209 target->rela_dyn_section(layout),
1210 elfcpp::R_X86_64_TLSDESC, 0);
c2b45e22
CC		 1211 }
1212 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 1213 unsupported_reloc_local(object, r_type);
2e30d253
ILT		 1214 break;
1215
c2b45e22
CC		 1216 case elfcpp::R_X86_64_TLSDESC_CALL:
1217 break;
1218
e041f13d 1219 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 1220 if (optimized_type == tls::TLSOPT_NONE)
1221 {
1222 // Create a GOT entry for the module index.
31d60480 1223 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 1224 }
1225 else if (optimized_type != tls::TLSOPT_TO_LE)
1226 unsupported_reloc_local(object, r_type);
1227 break;
1228
0ffd9845
ILT		 1229 case elfcpp::R_X86_64_DTPOFF32:
1230 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 1231 break;
1232
56622147 1233 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 1234 layout->set_has_static_tls();
7bf1f802
ILT		 1235 if (optimized_type == tls::TLSOPT_NONE)
1236 {
1237 // Create a GOT entry for the tp-relative offset.
1238 Output_data_got<64, false>* got
1239 = target->got_section(symtab, layout);
1240 unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info());
0a65a3a7 1241 got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET,
7bf1f802
ILT		 1242 target->rela_dyn_section(layout),
1243 elfcpp::R_X86_64_TPOFF64);
1244 }
1245 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147
ILT		 1246 unsupported_reloc_local(object, r_type);
1247 break;
0ffd9845 1248
56622147 1249 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 1250 layout->set_has_static_tls();
7bf1f802
ILT		 1251 if (output_is_shared)
1252 unsupported_reloc_local(object, r_type);
2e30d253 1253 break;
e041f13d
ILT		 1254
1255 default:
1256 gold_unreachable();
2e30d253
ILT		 1257 }
1258 }
1259 break;
2e30d253 1260
fdc2f80f
ILT		 1261 case elfcpp::R_X86_64_SIZE32:
1262 case elfcpp::R_X86_64_SIZE64:
2e30d253 1263 default:
75f2446e
ILT		 1264 gold_error(_("%s: unsupported reloc %u against local symbol"),
1265 object->name().c_str(), r_type);
2e30d253
ILT		 1266 break;
1267 }
1268}
1269
1270
e041f13d
ILT		 1271// Report an unsupported relocation against a global symbol.
1272
1273void
1274Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object,
1275 unsigned int r_type,
1276 Symbol* gsym)
1277{
75f2446e 1278 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 1279 object->name().c_str(), r_type, gsym->demangled_name().c_str());
e041f13d
ILT		 1280}
1281
2e30d253
ILT		 1282// Scan a relocation for a global symbol.
1283
1284inline void
ad0f2072 1285Target_x86_64::Scan::global(Symbol_table* symtab,
d61c17ea
ILT		 1286 Layout* layout,
1287 Target_x86_64* target,
1288 Sized_relobj<64, false>* object,
1289 unsigned int data_shndx,
4f4c5f80 1290 Output_section* output_section,
d61c17ea
ILT		 1291 const elfcpp::Rela<64, false>& reloc,
1292 unsigned int r_type,
1293 Symbol* gsym)
2e30d253
ILT		 1294{
1295 switch (r_type)
1296 {
1297 case elfcpp::R_X86_64_NONE:
e822f2b1
ILT		 1298 case elfcpp::R_386_GNU_VTINHERIT:
1299 case elfcpp::R_386_GNU_VTENTRY:
2e30d253
ILT		 1300 break;
1301
1302 case elfcpp::R_X86_64_64:
2e30d253
ILT		 1303 case elfcpp::R_X86_64_32:
1304 case elfcpp::R_X86_64_32S:
2e30d253 1305 case elfcpp::R_X86_64_16:
2e30d253 1306 case elfcpp::R_X86_64_8:
96f2030e 1307 {
d61c6bd4
ILT		 1308 // Make a PLT entry if necessary.
1309 if (gsym->needs_plt_entry())
1310 {
1311 target->make_plt_entry(symtab, layout, gsym);
1312 // Since this is not a PC-relative relocation, we may be
1313 // taking the address of a function. In that case we need to
1314 // set the entry in the dynamic symbol table to the address of
1315 // the PLT entry.
8851ecca 1316 if (gsym->is_from_dynobj() && !parameters->options().shared())
d61c6bd4
ILT		 1317 gsym->set_needs_dynsym_value();
1318 }
1319 // Make a dynamic relocation if necessary.
0700cf32 1320 if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF))
d61c6bd4 1321 {
966d4097 1322 if (gsym->may_need_copy_reloc())
d61c6bd4 1323 {
12c0daef 1324 target->copy_reloc(symtab, layout, object,
7bf1f802 1325 data_shndx, output_section, gsym, reloc);
d61c6bd4
ILT		 1326 }
1327 else if (r_type == elfcpp::R_X86_64_64
1328 && gsym->can_use_relative_reloc(false))
1329 {
1330 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
e8c846c3
ILT		 1331 rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE,
1332 output_section, object,
1333 data_shndx, reloc.get_r_offset(),
1334 reloc.get_r_addend());
d61c6bd4
ILT		 1335 }
1336 else
1337 {
a036edd8 1338 this->check_non_pic(object, r_type);
96f2030e 1339 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
4f4c5f80
ILT		 1340 rela_dyn->add_global(gsym, r_type, output_section, object,
1341 data_shndx, reloc.get_r_offset(),
96f2030e 1342 reloc.get_r_addend());
d61c6bd4
ILT		 1343 }
1344 }
1345 }
1346 break;
1347
1348 case elfcpp::R_X86_64_PC64:
1349 case elfcpp::R_X86_64_PC32:
1350 case elfcpp::R_X86_64_PC16:
1351 case elfcpp::R_X86_64_PC8:
1352 {
1353 // Make a PLT entry if necessary.
1354 if (gsym->needs_plt_entry())
1355 target->make_plt_entry(symtab, layout, gsym);
1356 // Make a dynamic relocation if necessary.
0700cf32 1357 int flags = Symbol::NON_PIC_REF;
53d7974c 1358 if (gsym->is_func())
0700cf32
ILT		 1359 flags |= Symbol::FUNCTION_CALL;
1360 if (gsym->needs_dynamic_reloc(flags))
86849f1f 1361 {
966d4097 1362 if (gsym->may_need_copy_reloc())
d61c6bd4 1363 {
12c0daef 1364 target->copy_reloc(symtab, layout, object,
7bf1f802 1365 data_shndx, output_section, gsym, reloc);
d61c6bd4 1366 }
86849f1f 1367 else
d61c6bd4 1368 {
a036edd8 1369 this->check_non_pic(object, r_type);
d61c6bd4 1370 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
4f4c5f80
ILT		 1371 rela_dyn->add_global(gsym, r_type, output_section, object,
1372 data_shndx, reloc.get_r_offset(),
d61c6bd4
ILT		 1373 reloc.get_r_addend());
1374 }
86849f1f 1375 }
d61c6bd4 1376 }
2e30d253
ILT		 1377 break;
1378
ff006520 1379 case elfcpp::R_X86_64_GOT64:
2e30d253 1380 case elfcpp::R_X86_64_GOT32:
ff006520
ILT		 1381 case elfcpp::R_X86_64_GOTPCREL64:
1382 case elfcpp::R_X86_64_GOTPCREL:
1383 case elfcpp::R_X86_64_GOTPLT64:
2e30d253
ILT		 1384 {
1385 // The symbol requires a GOT entry.
1386 Output_data_got<64, false>* got = target->got_section(symtab, layout);
7bf1f802 1387 if (gsym->final_value_is_known())
0a65a3a7 1388 got->add_global(gsym, GOT_TYPE_STANDARD);
7bf1f802
ILT		 1389 else
1390 {
2e30d253
ILT		 1391 // If this symbol is not fully resolved, we need to add a
1392 // dynamic relocation for it.
7bf1f802 1393 Reloc_section* rela_dyn = target->rela_dyn_section(layout);
8fc19601
ILT		 1394 if (gsym->is_from_dynobj()
1395 || gsym->is_undefined()
1396 || gsym->is_preemptible())
0a65a3a7 1397 got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn,
7bf1f802
ILT		 1398 elfcpp::R_X86_64_GLOB_DAT);
1399 else
2e30d253 1400 {
0a65a3a7
CC		 1401 if (got->add_global(gsym, GOT_TYPE_STANDARD))
1402 rela_dyn->add_global_relative(
1403 gsym, elfcpp::R_X86_64_RELATIVE, got,
1404 gsym->got_offset(GOT_TYPE_STANDARD), 0);
2e30d253
ILT		 1405 }
1406 }
ee9e9e86
ILT		 1407 // For GOTPLT64, we also need a PLT entry (but only if the
1408 // symbol is not fully resolved).
1409 if (r_type == elfcpp::R_X86_64_GOTPLT64
1410 && !gsym->final_value_is_known())
1411 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 1412 }
1413 break;
1414
1415 case elfcpp::R_X86_64_PLT32:
1416 // If the symbol is fully resolved, this is just a PC32 reloc.
1417 // Otherwise we need a PLT entry.
1418 if (gsym->final_value_is_known())
1419 break;
96f2030e
ILT		 1420 // If building a shared library, we can also skip the PLT entry
1421 // if the symbol is defined in the output file and is protected
1422 // or hidden.
1423 if (gsym->is_defined()
1424 && !gsym->is_from_dynobj()
1425 && !gsym->is_preemptible())
1426 break;
2e30d253
ILT		 1427 target->make_plt_entry(symtab, layout, gsym);
1428 break;
1429
fdc2f80f 1430 case elfcpp::R_X86_64_GOTPC32:
e822f2b1 1431 case elfcpp::R_X86_64_GOTOFF64:
fdc2f80f
ILT		 1432 case elfcpp::R_X86_64_GOTPC64:
1433 case elfcpp::R_X86_64_PLTOFF64:
2e30d253
ILT		 1434 // We need a GOT section.
1435 target->got_section(symtab, layout);
ee9e9e86
ILT		 1436 // For PLTOFF64, we also need a PLT entry (but only if the
1437 // symbol is not fully resolved).
1438 if (r_type == elfcpp::R_X86_64_PLTOFF64
1439 && !gsym->final_value_is_known())
1440 target->make_plt_entry(symtab, layout, gsym);
2e30d253
ILT		 1441 break;
1442
2e30d253
ILT		 1443 case elfcpp::R_X86_64_COPY:
1444 case elfcpp::R_X86_64_GLOB_DAT:
1445 case elfcpp::R_X86_64_JUMP_SLOT:
1446 case elfcpp::R_X86_64_RELATIVE:
d61c17ea 1447 // These are outstanding tls relocs, which are unexpected when linking
e822f2b1 1448 case elfcpp::R_X86_64_TPOFF64:
2e30d253 1449 case elfcpp::R_X86_64_DTPMOD64:
e822f2b1 1450 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 1451 gold_error(_("%s: unexpected reloc %u in object file"),
1452 object->name().c_str(), r_type);
2e30d253 1453 break;
2e30d253 1454
d61c17ea 1455 // These are initial tls relocs, which are expected for global()
56622147
ILT		 1456 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
1457 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 1458 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 1459 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 1460 case elfcpp::R_X86_64_DTPOFF32:
1461 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 1462 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
1463 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2e30d253
ILT		 1464 {
1465 const bool is_final = gsym->final_value_is_known();
e041f13d
ILT		 1466 const tls::Tls_optimization optimized_type
1467 = Target_x86_64::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 1468 switch (r_type)
1469 {
56622147 1470 case elfcpp::R_X86_64_TLSGD: // General-dynamic
7bf1f802
ILT		 1471 if (optimized_type == tls::TLSOPT_NONE)
1472 {
1473 // Create a pair of GOT entries for the module index and
1474 // dtv-relative offset.
1475 Output_data_got<64, false>* got
1476 = target->got_section(symtab, layout);
0a65a3a7
CC		 1477 got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR,
1478 target->rela_dyn_section(layout),
1479 elfcpp::R_X86_64_DTPMOD64,
1480 elfcpp::R_X86_64_DTPOFF64);
7bf1f802
ILT		 1481 }
1482 else if (optimized_type == tls::TLSOPT_TO_IE)
1483 {
1484 // Create a GOT entry for the tp-relative offset.
1485 Output_data_got<64, false>* got
1486 = target->got_section(symtab, layout);
0a65a3a7 1487 got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET,
7bf1f802
ILT		 1488 target->rela_dyn_section(layout),
1489 elfcpp::R_X86_64_TPOFF64);
1490 }
1491 else if (optimized_type != tls::TLSOPT_TO_LE)
1492 unsupported_reloc_global(object, r_type, gsym);
1493 break;
1494
56622147 1495 case elfcpp::R_X86_64_GOTPC32_TLSDESC:
edfbb029 1496 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 1497 if (optimized_type == tls::TLSOPT_NONE)
1498 {
1499 // Create reserved PLT and GOT entries for the resolver.
1500 target->reserve_tlsdesc_entries(symtab, layout);
1501
1502 // Create a double GOT entry with an R_X86_64_TLSDESC reloc.
1503 Output_data_got<64, false>* got
1504 = target->got_section(symtab, layout);
1505 got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC,
1506 target->rela_dyn_section(layout),
1507 elfcpp::R_X86_64_TLSDESC, 0);
1508 }
1509 else if (optimized_type == tls::TLSOPT_TO_IE)
1510 {
1511 // Create a GOT entry for the tp-relative offset.
1512 Output_data_got<64, false>* got
1513 = target->got_section(symtab, layout);
1514 got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET,
1515 target->rela_dyn_section(layout),
1516 elfcpp::R_X86_64_TPOFF64);
1517 }
1518 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147 1519 unsupported_reloc_global(object, r_type, gsym);
2e30d253
ILT		 1520 break;
1521
c2b45e22
CC		 1522 case elfcpp::R_X86_64_TLSDESC_CALL:
1523 break;
1524
e041f13d 1525 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
7bf1f802
ILT		 1526 if (optimized_type == tls::TLSOPT_NONE)
1527 {
1528 // Create a GOT entry for the module index.
31d60480 1529 target->got_mod_index_entry(symtab, layout, object);
7bf1f802
ILT		 1530 }
1531 else if (optimized_type != tls::TLSOPT_TO_LE)
1532 unsupported_reloc_global(object, r_type, gsym);
1533 break;
1534
0ffd9845
ILT		 1535 case elfcpp::R_X86_64_DTPOFF32:
1536 case elfcpp::R_X86_64_DTPOFF64:
e041f13d
ILT		 1537 break;
1538
56622147 1539 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
535890bb 1540 layout->set_has_static_tls();
7bf1f802
ILT		 1541 if (optimized_type == tls::TLSOPT_NONE)
1542 {
1543 // Create a GOT entry for the tp-relative offset.
1544 Output_data_got<64, false>* got
1545 = target->got_section(symtab, layout);
0a65a3a7 1546 got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET,
7bf1f802
ILT		 1547 target->rela_dyn_section(layout),
1548 elfcpp::R_X86_64_TPOFF64);
1549 }
1550 else if (optimized_type != tls::TLSOPT_TO_LE)
56622147
ILT		 1551 unsupported_reloc_global(object, r_type, gsym);
1552 break;
0ffd9845 1553
56622147 1554 case elfcpp::R_X86_64_TPOFF32: // Local-exec
535890bb 1555 layout->set_has_static_tls();
8851ecca 1556 if (parameters->options().shared())
7bf1f802 1557 unsupported_reloc_local(object, r_type);
2e30d253 1558 break;
e041f13d
ILT		 1559
1560 default:
1561 gold_unreachable();
2e30d253
ILT		 1562 }
1563 }
1564 break;
fdc2f80f
ILT		 1565
1566 case elfcpp::R_X86_64_SIZE32:
1567 case elfcpp::R_X86_64_SIZE64:
2e30d253 1568 default:
75f2446e 1569 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12
ILT		 1570 object->name().c_str(), r_type,
1571 gsym->demangled_name().c_str());
2e30d253
ILT		 1572 break;
1573 }
1574}
1575
6d03d481 1576void
ad0f2072 1577Target_x86_64::gc_process_relocs(Symbol_table* symtab,
6d03d481
ST		 1578 Layout* layout,
1579 Sized_relobj<64, false>* object,
1580 unsigned int data_shndx,
1581 unsigned int sh_type,
1582 const unsigned char* prelocs,
1583 size_t reloc_count,
1584 Output_section* output_section,
1585 bool needs_special_offset_handling,
1586 size_t local_symbol_count,
1587 const unsigned char* plocal_symbols)
1588{
1589
1590 if (sh_type == elfcpp::SHT_REL)
1591 {
1592 return;
1593 }
1594
1595 gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA,
1596 Target_x86_64::Scan>(
6d03d481
ST		 1597 symtab,
1598 layout,
1599 this,
1600 object,
1601 data_shndx,
1602 prelocs,
1603 reloc_count,
1604 output_section,
1605 needs_special_offset_handling,
1606 local_symbol_count,
1607 plocal_symbols);
1608
1609}
2e30d253
ILT		 1610// Scan relocations for a section.
1611
1612void
ad0f2072 1613Target_x86_64::scan_relocs(Symbol_table* symtab,
d61c17ea
ILT		 1614 Layout* layout,
1615 Sized_relobj<64, false>* object,
1616 unsigned int data_shndx,
1617 unsigned int sh_type,
1618 const unsigned char* prelocs,
1619 size_t reloc_count,
730cdc88
ILT		 1620 Output_section* output_section,
1621 bool needs_special_offset_handling,
d61c17ea 1622 size_t local_symbol_count,
730cdc88 1623 const unsigned char* plocal_symbols)
2e30d253
ILT		 1624{
1625 if (sh_type == elfcpp::SHT_REL)
1626 {
75f2446e
ILT		 1627 gold_error(_("%s: unsupported REL reloc section"),
1628 object->name().c_str());
1629 return;
2e30d253
ILT		 1630 }
1631
1632 gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA,
1633 Target_x86_64::Scan>(
2e30d253
ILT		 1634 symtab,
1635 layout,
1636 this,
1637 object,
1638 data_shndx,
1639 prelocs,
1640 reloc_count,
730cdc88
ILT		 1641 output_section,
1642 needs_special_offset_handling,
2e30d253 1643 local_symbol_count,
730cdc88 1644 plocal_symbols);
2e30d253
ILT		 1645}
1646
1647// Finalize the sections.
1648
1649void
f59f41f3
DK		 1650Target_x86_64::do_finalize_sections(
1651 Layout* layout,
1652 const Input_objects*,
1653 Symbol_table*)
2e30d253
ILT		 1654{
1655 // Fill in some more dynamic tags.
1656 Output_data_dynamic* const odyn = layout->dynamic_data();
1657 if (odyn != NULL)
1658 {
22b127cc
ILT		 1659 if (this->got_plt_ != NULL
1660 && this->got_plt_->output_section() != NULL)
2e30d253
ILT		 1661 odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_);
1662
22b127cc
ILT		 1663 if (this->plt_ != NULL
1664 && this->plt_->output_section() != NULL)
2e30d253
ILT		 1665 {
1666 const Output_data* od = this->plt_->rel_plt();
1667 odyn->add_section_size(elfcpp::DT_PLTRELSZ, od);
1668 odyn->add_section_address(elfcpp::DT_JMPREL, od);
1669 odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA);
c2b45e22
CC		 1670 if (this->plt_->has_tlsdesc_entry())
1671 {
1672 unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset();
1673 unsigned int got_offset = this->plt_->get_tlsdesc_got_offset();
1674 this->got_->finalize_data_size();
1675 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT,
1676 this->plt_, plt_offset);
1677 odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT,
1678 this->got_, got_offset);
1679 }
2e30d253
ILT		 1680 }
1681
22b127cc
ILT		 1682 if (this->rela_dyn_ != NULL
1683 && this->rela_dyn_->output_section() != NULL)
2e30d253 1684 {
0ffd9845 1685 const Output_data* od = this->rela_dyn_;
2e30d253 1686 odyn->add_section_address(elfcpp::DT_RELA, od);
e84992bb 1687 odyn->add_section_size(elfcpp::DT_RELASZ, od);
2e30d253 1688 odyn->add_constant(elfcpp::DT_RELAENT,
e84992bb 1689 elfcpp::Elf_sizes<64>::rela_size);
2e30d253
ILT		 1690 }
1691
8851ecca 1692 if (!parameters->options().shared())
2e30d253
ILT		 1693 {
1694 // The value of the DT_DEBUG tag is filled in by the dynamic
1695 // linker at run time, and used by the debugger.
1696 odyn->add_constant(elfcpp::DT_DEBUG, 0);
1697 }
1698 }
1699
1700 // Emit any relocs we saved in an attempt to avoid generating COPY
1701 // relocs.
12c0daef
ILT		 1702 if (this->copy_relocs_.any_saved_relocs())
1703 this->copy_relocs_.emit(this->rela_dyn_section(layout));
2e30d253
ILT		 1704}
1705
1706// Perform a relocation.
1707
1708inline bool
1709Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo,
1710 Target_x86_64* target,
031cdbed 1711 Output_section*,
2e30d253 1712 size_t relnum,
0ffd9845 1713 const elfcpp::Rela<64, false>& rela,
2e30d253
ILT		 1714 unsigned int r_type,
1715 const Sized_symbol<64>* gsym,
1716 const Symbol_value<64>* psymval,
1717 unsigned char* view,
1718 elfcpp::Elf_types<64>::Elf_Addr address,
fe8718a4 1719 section_size_type view_size)
2e30d253
ILT		 1720{
1721 if (this->skip_call_tls_get_addr_)
1722 {
5efc7cd2
CC		 1723 if ((r_type != elfcpp::R_X86_64_PLT32
1724 && r_type != elfcpp::R_X86_64_PC32)
2e30d253 1725 || gsym == NULL
0ffd9845 1726 || strcmp(gsym->name(), "__tls_get_addr") != 0)
2e30d253 1727 {
75f2446e
ILT		 1728 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1729 _("missing expected TLS relocation"));
1730 }
1731 else
1732 {
1733 this->skip_call_tls_get_addr_ = false;
1734 return false;
2e30d253 1735 }
2e30d253
ILT		 1736 }
1737
1738 // Pick the value to use for symbols defined in shared objects.
1739 Symbol_value<64> symval;
96f2030e 1740 if (gsym != NULL
de4c45bd
ILT		 1741 && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64
1742 || r_type == elfcpp::R_X86_64_PC32
1743 || r_type == elfcpp::R_X86_64_PC16
1744 || r_type == elfcpp::R_X86_64_PC8))
2e30d253
ILT		 1745 {
1746 symval.set_output_value(target->plt_section()->address()
1747 + gsym->plt_offset());
1748 psymval = &symval;
1749 }
1750
1751 const Sized_relobj<64, false>* object = relinfo->object;
0ffd9845
ILT		 1752 const elfcpp::Elf_Xword addend = rela.get_r_addend();
1753
1754 // Get the GOT offset if needed.
96f2030e
ILT		 1755 // The GOT pointer points to the end of the GOT section.
1756 // We need to subtract the size of the GOT section to get
1757 // the actual offset to use in the relocation.
0ffd9845
ILT		 1758 bool have_got_offset = false;
1759 unsigned int got_offset = 0;
1760 switch (r_type)
1761 {
1762 case elfcpp::R_X86_64_GOT32:
1763 case elfcpp::R_X86_64_GOT64:
1764 case elfcpp::R_X86_64_GOTPLT64:
1765 case elfcpp::R_X86_64_GOTPCREL:
1766 case elfcpp::R_X86_64_GOTPCREL64:
1767 if (gsym != NULL)
1768 {
0a65a3a7
CC		 1769 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
1770 got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size();
0ffd9845
ILT		 1771 }
1772 else
1773 {
1774 unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
0a65a3a7
CC		 1775 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
1776 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
1777 - target->got_size());
0ffd9845
ILT		 1778 }
1779 have_got_offset = true;
1780 break;
1781
1782 default:
1783 break;
1784 }
2e30d253
ILT		 1785
1786 switch (r_type)
1787 {
1788 case elfcpp::R_X86_64_NONE:
e822f2b1
ILT		 1789 case elfcpp::R_386_GNU_VTINHERIT:
1790 case elfcpp::R_386_GNU_VTENTRY:
2e30d253
ILT		 1791 break;
1792
1793 case elfcpp::R_X86_64_64:
1794 Relocate_functions<64, false>::rela64(view, object, psymval, addend);
1795 break;
1796
1797 case elfcpp::R_X86_64_PC64:
1798 Relocate_functions<64, false>::pcrela64(view, object, psymval, addend,
1799 address);
1800 break;
1801
1802 case elfcpp::R_X86_64_32:
7bb3655e
ILT		 1803 // FIXME: we need to verify that value + addend fits into 32 bits:
1804 // uint64_t x = value + addend;
1805 // x == static_cast<uint64_t>(static_cast<uint32_t>(x))
1806 // Likewise for other <=32-bit relocations (but see R_X86_64_32S).
2e30d253
ILT		 1807 Relocate_functions<64, false>::rela32(view, object, psymval, addend);
1808 break;
1809
1810 case elfcpp::R_X86_64_32S:
7bb3655e
ILT		 1811 // FIXME: we need to verify that value + addend fits into 32 bits:
1812 // int64_t x = value + addend; // note this quantity is signed!
1813 // x == static_cast<int64_t>(static_cast<int32_t>(x))
2e30d253
ILT		 1814 Relocate_functions<64, false>::rela32(view, object, psymval, addend);
1815 break;
1816
1817 case elfcpp::R_X86_64_PC32:
1818 Relocate_functions<64, false>::pcrela32(view, object, psymval, addend,
1819 address);
1820 break;
1821
1822 case elfcpp::R_X86_64_16:
1823 Relocate_functions<64, false>::rela16(view, object, psymval, addend);
1824 break;
1825
1826 case elfcpp::R_X86_64_PC16:
1827 Relocate_functions<64, false>::pcrela16(view, object, psymval, addend,
1828 address);
1829 break;
1830
1831 case elfcpp::R_X86_64_8:
1832 Relocate_functions<64, false>::rela8(view, object, psymval, addend);
1833 break;
1834
1835 case elfcpp::R_X86_64_PC8:
1836 Relocate_functions<64, false>::pcrela8(view, object, psymval, addend,
1837 address);
1838 break;
1839
1840 case elfcpp::R_X86_64_PLT32:
f389a824
ILT		 1841 gold_assert(gsym == NULL
1842 || gsym->has_plt_offset()
99f8faca
ILT		 1843 || gsym->final_value_is_known()
1844 || (gsym->is_defined()
1845 && !gsym->is_from_dynobj()
1846 && !gsym->is_preemptible()));
ee9e9e86
ILT		 1847 // Note: while this code looks the same as for R_X86_64_PC32, it
1848 // behaves differently because psymval was set to point to
1849 // the PLT entry, rather than the symbol, in Scan::global().
2e30d253
ILT		 1850 Relocate_functions<64, false>::pcrela32(view, object, psymval, addend,
1851 address);
1852 break;
1853
ee9e9e86
ILT		 1854 case elfcpp::R_X86_64_PLTOFF64:
1855 {
1856 gold_assert(gsym);
1857 gold_assert(gsym->has_plt_offset()
1858 || gsym->final_value_is_known());
1859 elfcpp::Elf_types<64>::Elf_Addr got_address;
1860 got_address = target->got_section(NULL, NULL)->address();
c1866bd5
ILT		 1861 Relocate_functions<64, false>::rela64(view, object, psymval,
1862 addend - got_address);
ee9e9e86
ILT		 1863 }
1864
2e30d253 1865 case elfcpp::R_X86_64_GOT32:
0ffd9845
ILT		 1866 gold_assert(have_got_offset);
1867 Relocate_functions<64, false>::rela32(view, got_offset, addend);
2e30d253
ILT		 1868 break;
1869
e822f2b1
ILT		 1870 case elfcpp::R_X86_64_GOTPC32:
1871 {
1872 gold_assert(gsym);
1873 elfcpp::Elf_types<64>::Elf_Addr value;
96f2030e 1874 value = target->got_plt_section()->address();
e822f2b1
ILT		 1875 Relocate_functions<64, false>::pcrela32(view, value, addend, address);
1876 }
1877 break;
1878
1879 case elfcpp::R_X86_64_GOT64:
1880 // The ABI doc says "Like GOT64, but indicates a PLT entry is needed."
1881 // Since we always add a PLT entry, this is equivalent.
fdc2f80f 1882 case elfcpp::R_X86_64_GOTPLT64:
0ffd9845
ILT		 1883 gold_assert(have_got_offset);
1884 Relocate_functions<64, false>::rela64(view, got_offset, addend);
e822f2b1
ILT		 1885 break;
1886
1887 case elfcpp::R_X86_64_GOTPC64:
1888 {
1889 gold_assert(gsym);
1890 elfcpp::Elf_types<64>::Elf_Addr value;
96f2030e 1891 value = target->got_plt_section()->address();
e822f2b1
ILT		 1892 Relocate_functions<64, false>::pcrela64(view, value, addend, address);
1893 }
1894 break;
1895
2e30d253
ILT		 1896 case elfcpp::R_X86_64_GOTOFF64:
1897 {
1898 elfcpp::Elf_types<64>::Elf_Addr value;
1899 value = (psymval->value(object, 0)
96f2030e 1900 - target->got_plt_section()->address());
2e30d253
ILT		 1901 Relocate_functions<64, false>::rela64(view, value, addend);
1902 }
1903 break;
1904
1905 case elfcpp::R_X86_64_GOTPCREL:
1906 {
0ffd9845
ILT		 1907 gold_assert(have_got_offset);
1908 elfcpp::Elf_types<64>::Elf_Addr value;
96f2030e 1909 value = target->got_plt_section()->address() + got_offset;
0ffd9845 1910 Relocate_functions<64, false>::pcrela32(view, value, addend, address);
2e30d253
ILT		 1911 }
1912 break;
1913
e822f2b1
ILT		 1914 case elfcpp::R_X86_64_GOTPCREL64:
1915 {
0ffd9845
ILT		 1916 gold_assert(have_got_offset);
1917 elfcpp::Elf_types<64>::Elf_Addr value;
96f2030e 1918 value = target->got_plt_section()->address() + got_offset;
0ffd9845 1919 Relocate_functions<64, false>::pcrela64(view, value, addend, address);
e822f2b1
ILT		 1920 }
1921 break;
1922
2e30d253
ILT		 1923 case elfcpp::R_X86_64_COPY:
1924 case elfcpp::R_X86_64_GLOB_DAT:
1925 case elfcpp::R_X86_64_JUMP_SLOT:
1926 case elfcpp::R_X86_64_RELATIVE:
d61c17ea 1927 // These are outstanding tls relocs, which are unexpected when linking
2e30d253 1928 case elfcpp::R_X86_64_TPOFF64:
2e30d253 1929 case elfcpp::R_X86_64_DTPMOD64:
2e30d253 1930 case elfcpp::R_X86_64_TLSDESC:
75f2446e
ILT		 1931 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1932 _("unexpected reloc %u in object file"),
1933 r_type);
2e30d253
ILT		 1934 break;
1935
d61c17ea 1936 // These are initial tls relocs, which are expected when linking
56622147
ILT		 1937 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
1938 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
e041f13d 1939 case elfcpp::R_X86_64_TLSDESC_CALL:
56622147 1940 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
0ffd9845
ILT		 1941 case elfcpp::R_X86_64_DTPOFF32:
1942 case elfcpp::R_X86_64_DTPOFF64:
56622147
ILT		 1943 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
1944 case elfcpp::R_X86_64_TPOFF32: // Local-exec
7bf1f802
ILT		 1945 this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval,
1946 view, address, view_size);
2e30d253 1947 break;
2e30d253 1948
fdc2f80f
ILT		 1949 case elfcpp::R_X86_64_SIZE32:
1950 case elfcpp::R_X86_64_SIZE64:
2e30d253 1951 default:
75f2446e
ILT		 1952 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
1953 _("unsupported reloc %u"),
1954 r_type);
2e30d253
ILT		 1955 break;
1956 }
1957
1958 return true;
1959}
1960
1961// Perform a TLS relocation.
1962
1963inline void
d61c17ea 1964Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo,
7bf1f802 1965 Target_x86_64* target,
d61c17ea 1966 size_t relnum,
72ec2876 1967 const elfcpp::Rela<64, false>& rela,
d61c17ea
ILT		 1968 unsigned int r_type,
1969 const Sized_symbol<64>* gsym,
1970 const Symbol_value<64>* psymval,
1971 unsigned char* view,
6a41d30b 1972 elfcpp::Elf_types<64>::Elf_Addr address,
fe8718a4 1973 section_size_type view_size)
2e30d253 1974{
2e30d253 1975 Output_segment* tls_segment = relinfo->layout->tls_segment();
7bf1f802
ILT		 1976
1977 const Sized_relobj<64, false>* object = relinfo->object;
6a41d30b 1978 const elfcpp::Elf_Xword addend = rela.get_r_addend();
2e30d253
ILT		 1979
1980 elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0);
1981
1982 const bool is_final = (gsym == NULL
8851ecca 1983 ? !parameters->options().output_is_position_independent()
2e30d253 1984 : gsym->final_value_is_known());
e041f13d
ILT		 1985 const tls::Tls_optimization optimized_type
1986 = Target_x86_64::optimize_tls_reloc(is_final, r_type);
2e30d253
ILT		 1987 switch (r_type)
1988 {
56622147 1989 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
497897f9 1990 this->saw_tls_block_reloc_ = true;
e041f13d 1991 if (optimized_type == tls::TLSOPT_TO_LE)
2e30d253 1992 {
7bf1f802 1993 gold_assert(tls_segment != NULL);
2e30d253 1994 this->tls_gd_to_le(relinfo, relnum, tls_segment,
72ec2876 1995 rela, r_type, value, view,
2e30d253
ILT		 1996 view_size);
1997 break;
1998 }
7bf1f802
ILT		 1999 else
2000 {
c2b45e22
CC		 2001 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
2002 ? GOT_TYPE_TLS_OFFSET
2003 : GOT_TYPE_TLS_PAIR);
7bf1f802
ILT		 2004 unsigned int got_offset;
2005 if (gsym != NULL)
2006 {
c2b45e22
CC		 2007 gold_assert(gsym->has_got_offset(got_type));
2008 got_offset = gsym->got_offset(got_type) - target->got_size();
7bf1f802
ILT		 2009 }
2010 else
2011 {
2012 unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
c2b45e22
CC		 2013 gold_assert(object->local_has_got_offset(r_sym, got_type));
2014 got_offset = (object->local_got_offset(r_sym, got_type)
7bf1f802
ILT		 2015 - target->got_size());
2016 }
2017 if (optimized_type == tls::TLSOPT_TO_IE)
2018 {
2019 gold_assert(tls_segment != NULL);
c2b45e22 2020 value = target->got_plt_section()->address() + got_offset;
7bf1f802 2021 this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type,
c2b45e22 2022 value, view, address, view_size);
7bf1f802
ILT		 2023 break;
2024 }
2025 else if (optimized_type == tls::TLSOPT_NONE)
2026 {
2027 // Relocate the field with the offset of the pair of GOT
2028 // entries.
6a41d30b
ILT		 2029 value = target->got_plt_section()->address() + got_offset;
2030 Relocate_functions<64, false>::pcrela32(view, value, addend,
2031 address);
7bf1f802
ILT		 2032 break;
2033 }
2034 }
72ec2876 2035 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 2036 _("unsupported reloc %u"), r_type);
2e30d253
ILT		 2037 break;
2038
c2b45e22
CC		 2039 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2040 case elfcpp::R_X86_64_TLSDESC_CALL:
497897f9 2041 this->saw_tls_block_reloc_ = true;
c2b45e22
CC		 2042 if (optimized_type == tls::TLSOPT_TO_LE)
2043 {
2044 gold_assert(tls_segment != NULL);
2045 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2046 rela, r_type, value, view,
2047 view_size);
2048 break;
2049 }
2050 else
2051 {
2052 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
2053 ? GOT_TYPE_TLS_OFFSET
2054 : GOT_TYPE_TLS_DESC);
2055 unsigned int got_offset;
2056 if (gsym != NULL)
2057 {
2058 gold_assert(gsym->has_got_offset(got_type));
2059 got_offset = gsym->got_offset(got_type) - target->got_size();
2060 }
2061 else
2062 {
2063 unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
2064 gold_assert(object->local_has_got_offset(r_sym, got_type));
2065 got_offset = (object->local_got_offset(r_sym, got_type)
2066 - target->got_size());
2067 }
2068 if (optimized_type == tls::TLSOPT_TO_IE)
2069 {
2070 gold_assert(tls_segment != NULL);
2071 value = target->got_plt_section()->address() + got_offset;
2072 this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment,
2073 rela, r_type, value, view, address,
2074 view_size);
2075 break;
2076 }
2077 else if (optimized_type == tls::TLSOPT_NONE)
2078 {
2079 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
2080 {
2081 // Relocate the field with the offset of the pair of GOT
2082 // entries.
2083 value = target->got_plt_section()->address() + got_offset;
2084 Relocate_functions<64, false>::pcrela32(view, value, addend,
2085 address);
2086 }
2087 break;
2088 }
2089 }
2090 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
2091 _("unsupported reloc %u"), r_type);
2092 break;
2093
56622147 2094 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
497897f9 2095 this->saw_tls_block_reloc_ = true;
e041f13d
ILT		 2096 if (optimized_type == tls::TLSOPT_TO_LE)
2097 {
7bf1f802 2098 gold_assert(tls_segment != NULL);
72ec2876
ILT		 2099 this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type,
2100 value, view, view_size);
2101 break;
e041f13d 2102 }
7bf1f802
ILT		 2103 else if (optimized_type == tls::TLSOPT_NONE)
2104 {
2105 // Relocate the field with the offset of the GOT entry for
2106 // the module index.
2107 unsigned int got_offset;
31d60480
ILT		 2108 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
2109 - target->got_size());
6a41d30b
ILT		 2110 value = target->got_plt_section()->address() + got_offset;
2111 Relocate_functions<64, false>::pcrela32(view, value, addend,
2112 address);
7bf1f802
ILT		 2113 break;
2114 }
72ec2876 2115 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
75f2446e 2116 _("unsupported reloc %u"), r_type);
2e30d253 2117 break;
0ffd9845
ILT		 2118
2119 case elfcpp::R_X86_64_DTPOFF32:
e041f13d 2120 if (optimized_type == tls::TLSOPT_TO_LE)
497897f9
ILT		 2121 {
2122 // This relocation type is used in debugging information.
2123 // In that case we need to not optimize the value. If we
2124 // haven't seen a TLSLD reloc, then we assume we should not
2125 // optimize this reloc.
2126 if (this->saw_tls_block_reloc_)
27721062
ST		 2127 {
2128 gold_assert(tls_segment != NULL);
2129 value -= tls_segment->memsz();
2130 }
497897f9 2131 }
d85c80a3 2132 Relocate_functions<64, false>::rela32(view, value, addend);
0ffd9845
ILT		 2133 break;
2134
2135 case elfcpp::R_X86_64_DTPOFF64:
e041f13d 2136 if (optimized_type == tls::TLSOPT_TO_LE)
497897f9
ILT		 2137 {
2138 // See R_X86_64_DTPOFF32, just above, for why we test this.
2139 if (this->saw_tls_block_reloc_)
27721062
ST		 2140 {
2141 gold_assert(tls_segment != NULL);
2142 value -= tls_segment->memsz();
2143 }
497897f9 2144 }
d85c80a3 2145 Relocate_functions<64, false>::rela64(view, value, addend);
0ffd9845 2146 break;
2e30d253 2147
56622147
ILT		 2148 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2149 if (optimized_type == tls::TLSOPT_TO_LE)
2150 {
7bf1f802 2151 gold_assert(tls_segment != NULL);
56622147
ILT		 2152 Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
2153 rela, r_type, value, view,
2154 view_size);
2155 break;
2156 }
7bf1f802
ILT		 2157 else if (optimized_type == tls::TLSOPT_NONE)
2158 {
2159 // Relocate the field with the offset of the GOT entry for
2160 // the tp-relative offset of the symbol.
2161 unsigned int got_offset;
2162 if (gsym != NULL)
2163 {
0a65a3a7
CC		 2164 gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET));
2165 got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET)
2166 - target->got_size());
7bf1f802
ILT		 2167 }
2168 else
2169 {
2170 unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info());
0a65a3a7
CC		 2171 gold_assert(object->local_has_got_offset(r_sym,
2172 GOT_TYPE_TLS_OFFSET));
2173 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET)
7bf1f802
ILT		 2174 - target->got_size());
2175 }
6a41d30b
ILT		 2176 value = target->got_plt_section()->address() + got_offset;
2177 Relocate_functions<64, false>::pcrela32(view, value, addend, address);
7bf1f802
ILT		 2178 break;
2179 }
56622147
ILT		 2180 gold_error_at_location(relinfo, relnum, rela.get_r_offset(),
2181 _("unsupported reloc type %u"),
2182 r_type);
2183 break;
0ffd9845 2184
56622147 2185 case elfcpp::R_X86_64_TPOFF32: // Local-exec
6a41d30b 2186 value -= tls_segment->memsz();
d85c80a3 2187 Relocate_functions<64, false>::rela32(view, value, addend);
56622147 2188 break;
2e30d253 2189 }
2e30d253
ILT		 2190}
2191
7bf1f802
ILT		 2192// Do a relocation in which we convert a TLS General-Dynamic to an
2193// Initial-Exec.
2194
2195inline void
2196Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo,
2197 size_t relnum,
c2b45e22 2198 Output_segment*,
7bf1f802
ILT		 2199 const elfcpp::Rela<64, false>& rela,
2200 unsigned int,
2201 elfcpp::Elf_types<64>::Elf_Addr value,
2202 unsigned char* view,
c2b45e22 2203 elfcpp::Elf_types<64>::Elf_Addr address,
fe8718a4 2204 section_size_type view_size)
7bf1f802
ILT		 2205{
2206 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2207 // .word 0x6666; rex64; call __tls_get_addr
2208 // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax
2209
2210 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4);
2211 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
2212
2213 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2214 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
2215 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2216 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
2217
2218 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16);
2219
c2b45e22
CC		 2220 const elfcpp::Elf_Xword addend = rela.get_r_addend();
2221 Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address);
7bf1f802
ILT		 2222
2223 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2224 // We can skip it.
2225 this->skip_call_tls_get_addr_ = true;
2226}
2227
e041f13d 2228// Do a relocation in which we convert a TLS General-Dynamic to a
2e30d253
ILT		 2229// Local-Exec.
2230
2231inline void
d61c17ea
ILT		 2232Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo,
2233 size_t relnum,
2234 Output_segment* tls_segment,
72ec2876 2235 const elfcpp::Rela<64, false>& rela,
d61c17ea
ILT		 2236 unsigned int,
2237 elfcpp::Elf_types<64>::Elf_Addr value,
2238 unsigned char* view,
fe8718a4 2239 section_size_type view_size)
2e30d253 2240{
0ffd9845
ILT		 2241 // .byte 0x66; leaq foo@tlsgd(%rip),%rdi;
2242 // .word 0x6666; rex64; call __tls_get_addr
2243 // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax
2e30d253 2244
72ec2876
ILT		 2245 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4);
2246 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12);
2e30d253 2247
72ec2876
ILT		 2248 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2249 (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0));
2250 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2251 (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0));
2e30d253 2252
0ffd9845 2253 memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16);
2e30d253 2254
6a41d30b 2255 value -= tls_segment->memsz();
0ffd9845 2256 Relocate_functions<64, false>::rela32(view + 8, value, 0);
2e30d253
ILT		 2257
2258 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2259 // We can skip it.
2260 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 2261}
2262
c2b45e22
CC		 2263// Do a TLSDESC-style General-Dynamic to Initial-Exec transition.
2264
2265inline void
2266Target_x86_64::Relocate::tls_desc_gd_to_ie(
2267 const Relocate_info<64, false>* relinfo,
2268 size_t relnum,
2269 Output_segment*,
2270 const elfcpp::Rela<64, false>& rela,
2271 unsigned int r_type,
2272 elfcpp::Elf_types<64>::Elf_Addr value,
2273 unsigned char* view,
2274 elfcpp::Elf_types<64>::Elf_Addr address,
2275 section_size_type view_size)
2276{
2277 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
2278 {
2279 // leaq foo@tlsdesc(%rip), %rax
2280 // ==> movq foo@gottpoff(%rip), %rax
2281 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
2282 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
2283 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2284 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
2285 view[-2] = 0x8b;
2286 const elfcpp::Elf_Xword addend = rela.get_r_addend();
2287 Relocate_functions<64, false>::pcrela32(view, value, addend, address);
2288 }
2289 else
2290 {
2291 // call *foo@tlscall(%rax)
2292 // ==> nop; nop
2293 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
2294 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
2295 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2296 view[0] == 0xff && view[1] == 0x10);
2297 view[0] = 0x66;
2298 view[1] = 0x90;
2299 }
2300}
2301
2302// Do a TLSDESC-style General-Dynamic to Local-Exec transition.
2303
2304inline void
2305Target_x86_64::Relocate::tls_desc_gd_to_le(
2306 const Relocate_info<64, false>* relinfo,
2307 size_t relnum,
2308 Output_segment* tls_segment,
2309 const elfcpp::Rela<64, false>& rela,
2310 unsigned int r_type,
2311 elfcpp::Elf_types<64>::Elf_Addr value,
2312 unsigned char* view,
2313 section_size_type view_size)
2314{
2315 if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC)
2316 {
2317 // leaq foo@tlsdesc(%rip), %rax
2318 // ==> movq foo@tpoff, %rax
2319 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
2320 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
2321 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2322 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05);
2323 view[-2] = 0xc7;
2324 view[-1] = 0xc0;
2325 value -= tls_segment->memsz();
2326 Relocate_functions<64, false>::rela32(view, value, 0);
2327 }
2328 else
2329 {
2330 // call *foo@tlscall(%rax)
2331 // ==> nop; nop
2332 gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL);
2333 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2);
2334 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2335 view[0] == 0xff && view[1] == 0x10);
2336 view[0] = 0x66;
2337 view[1] = 0x90;
2338 }
2339}
2340
2e30d253 2341inline void
72ec2876
ILT		 2342Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo,
2343 size_t relnum,
2344 Output_segment*,
2345 const elfcpp::Rela<64, false>& rela,
2346 unsigned int,
2347 elfcpp::Elf_types<64>::Elf_Addr,
2348 unsigned char* view,
fe8718a4 2349 section_size_type view_size)
2e30d253 2350{
72ec2876
ILT		 2351 // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt;
2352 // ... leq foo@dtpoff(%rax),%reg
2353 // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx
2e30d253 2354
72ec2876
ILT		 2355 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
2356 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9);
2e30d253 2357
72ec2876
ILT		 2358 tls::check_tls(relinfo, relnum, rela.get_r_offset(),
2359 view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d);
2360
2361 tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8);
2362
2363 memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12);
2364
2365 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2366 // We can skip it.
2367 this->skip_call_tls_get_addr_ = true;
2e30d253
ILT		 2368}
2369
56622147
ILT		 2370// Do a relocation in which we convert a TLS Initial-Exec to a
2371// Local-Exec.
2372
2373inline void
2374Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo,
2375 size_t relnum,
2376 Output_segment* tls_segment,
2377 const elfcpp::Rela<64, false>& rela,
2378 unsigned int,
2379 elfcpp::Elf_types<64>::Elf_Addr value,
2380 unsigned char* view,
fe8718a4 2381 section_size_type view_size)
56622147
ILT		 2382{
2383 // We need to examine the opcodes to figure out which instruction we
2384 // are looking at.
2385
2386 // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg
2387 // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg
2388
2389 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3);
2390 tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4);
2391
2392 unsigned char op1 = view[-3];
2393 unsigned char op2 = view[-2];
2394 unsigned char op3 = view[-1];
2395 unsigned char reg = op3 >> 3;
2396
2397 if (op2 == 0x8b)
2398 {
2399 // movq
2400 if (op1 == 0x4c)
2401 view[-3] = 0x49;
2402 view[-2] = 0xc7;
2403 view[-1] = 0xc0 | reg;
2404 }
2405 else if (reg == 4)
2406 {
2407 // Special handling for %rsp.
2408 if (op1 == 0x4c)
2409 view[-3] = 0x49;
2410 view[-2] = 0x81;
2411 view[-1] = 0xc0 | reg;
2412 }
2413 else
2414 {
2415 // addq
2416 if (op1 == 0x4c)
2417 view[-3] = 0x4d;
2418 view[-2] = 0x8d;
2419 view[-1] = 0x80 | reg | (reg << 3);
2420 }
2421
6a41d30b 2422 value -= tls_segment->memsz();
56622147
ILT		 2423 Relocate_functions<64, false>::rela32(view, value, 0);
2424}
2425
2e30d253
ILT		 2426// Relocate section data.
2427
2428void
364c7fa5
ILT		 2429Target_x86_64::relocate_section(
2430 const Relocate_info<64, false>* relinfo,
2431 unsigned int sh_type,
2432 const unsigned char* prelocs,
2433 size_t reloc_count,
2434 Output_section* output_section,
2435 bool needs_special_offset_handling,
2436 unsigned char* view,
2437 elfcpp::Elf_types<64>::Elf_Addr address,
2438 section_size_type view_size,
2439 const Reloc_symbol_changes* reloc_symbol_changes)
2e30d253
ILT		 2440{
2441 gold_assert(sh_type == elfcpp::SHT_RELA);
2442
2443 gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA,
2444 Target_x86_64::Relocate>(
2445 relinfo,
2446 this,
2447 prelocs,
2448 reloc_count,
730cdc88
ILT		 2449 output_section,
2450 needs_special_offset_handling,
2e30d253
ILT		 2451 view,
2452 address,
364c7fa5
ILT		 2453 view_size,
2454 reloc_symbol_changes);
2e30d253
ILT		 2455}
2456
6a74a719
ILT		 2457// Return the size of a relocation while scanning during a relocatable
2458// link.
2459
2460unsigned int
2461Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc(
2462 unsigned int r_type,
2463 Relobj* object)
2464{
2465 switch (r_type)
2466 {
2467 case elfcpp::R_X86_64_NONE:
2468 case elfcpp::R_386_GNU_VTINHERIT:
2469 case elfcpp::R_386_GNU_VTENTRY:
2470 case elfcpp::R_X86_64_TLSGD: // Global-dynamic
2471 case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url)
2472 case elfcpp::R_X86_64_TLSDESC_CALL:
2473 case elfcpp::R_X86_64_TLSLD: // Local-dynamic
2474 case elfcpp::R_X86_64_DTPOFF32:
2475 case elfcpp::R_X86_64_DTPOFF64:
2476 case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec
2477 case elfcpp::R_X86_64_TPOFF32: // Local-exec
2478 return 0;
2479
2480 case elfcpp::R_X86_64_64:
2481 case elfcpp::R_X86_64_PC64:
2482 case elfcpp::R_X86_64_GOTOFF64:
2483 case elfcpp::R_X86_64_GOTPC64:
2484 case elfcpp::R_X86_64_PLTOFF64:
2485 case elfcpp::R_X86_64_GOT64:
2486 case elfcpp::R_X86_64_GOTPCREL64:
2487 case elfcpp::R_X86_64_GOTPCREL:
2488 case elfcpp::R_X86_64_GOTPLT64:
2489 return 8;
2490
2491 case elfcpp::R_X86_64_32:
2492 case elfcpp::R_X86_64_32S:
2493 case elfcpp::R_X86_64_PC32:
2494 case elfcpp::R_X86_64_PLT32:
2495 case elfcpp::R_X86_64_GOTPC32:
2496 case elfcpp::R_X86_64_GOT32:
2497 return 4;
2498
2499 case elfcpp::R_X86_64_16:
2500 case elfcpp::R_X86_64_PC16:
2501 return 2;
2502
2503 case elfcpp::R_X86_64_8:
2504 case elfcpp::R_X86_64_PC8:
2505 return 1;
2506
2507 case elfcpp::R_X86_64_COPY:
2508 case elfcpp::R_X86_64_GLOB_DAT:
2509 case elfcpp::R_X86_64_JUMP_SLOT:
2510 case elfcpp::R_X86_64_RELATIVE:
2511 // These are outstanding tls relocs, which are unexpected when linking
2512 case elfcpp::R_X86_64_TPOFF64:
2513 case elfcpp::R_X86_64_DTPMOD64:
2514 case elfcpp::R_X86_64_TLSDESC:
2515 object->error(_("unexpected reloc %u in object file"), r_type);
2516 return 0;
2517
2518 case elfcpp::R_X86_64_SIZE32:
2519 case elfcpp::R_X86_64_SIZE64:
2520 default:
2521 object->error(_("unsupported reloc %u against local symbol"), r_type);
2522 return 0;
2523 }
2524}
2525
2526// Scan the relocs during a relocatable link.
2527
2528void
ad0f2072 2529Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab,
6a74a719
ILT		 2530 Layout* layout,
2531 Sized_relobj<64, false>* object,
2532 unsigned int data_shndx,
2533 unsigned int sh_type,
2534 const unsigned char* prelocs,
2535 size_t reloc_count,
2536 Output_section* output_section,
2537 bool needs_special_offset_handling,
2538 size_t local_symbol_count,
2539 const unsigned char* plocal_symbols,
2540 Relocatable_relocs* rr)
2541{
2542 gold_assert(sh_type == elfcpp::SHT_RELA);
2543
2544 typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA,
2545 Relocatable_size_for_reloc> Scan_relocatable_relocs;
2546
7019cd25 2547 gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA,
6a74a719 2548 Scan_relocatable_relocs>(
6a74a719
ILT		 2549 symtab,
2550 layout,
2551 object,
2552 data_shndx,
2553 prelocs,
2554 reloc_count,
2555 output_section,
2556 needs_special_offset_handling,
2557 local_symbol_count,
2558 plocal_symbols,
2559 rr);
2560}
2561
2562// Relocate a section during a relocatable link.
2563
2564void
2565Target_x86_64::relocate_for_relocatable(
2566 const Relocate_info<64, false>* relinfo,
2567 unsigned int sh_type,
2568 const unsigned char* prelocs,
2569 size_t reloc_count,
2570 Output_section* output_section,
2571 off_t offset_in_output_section,
2572 const Relocatable_relocs* rr,
2573 unsigned char* view,
2574 elfcpp::Elf_types<64>::Elf_Addr view_address,
2575 section_size_type view_size,
2576 unsigned char* reloc_view,
2577 section_size_type reloc_view_size)
2578{
2579 gold_assert(sh_type == elfcpp::SHT_RELA);
2580
7019cd25 2581 gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>(
6a74a719
ILT		 2582 relinfo,
2583 prelocs,
2584 reloc_count,
2585 output_section,
2586 offset_in_output_section,
2587 rr,
2588 view,
2589 view_address,
2590 view_size,
2591 reloc_view,
2592 reloc_view_size);
2593}
2594
4fb6c25d
ILT		 2595// Return the value to use for a dynamic which requires special
2596// treatment. This is how we support equality comparisons of function
2597// pointers across shared library boundaries, as described in the
2598// processor specific ABI supplement.
2599
2600uint64_t
2601Target_x86_64::do_dynsym_value(const Symbol* gsym) const
2602{
2603 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
2604 return this->plt_section()->address() + gsym->plt_offset();
2605}
2606
2e30d253
ILT		 2607// Return a string used to fill a code section with nops to take up
2608// the specified length.
2609
2610std::string
8851ecca 2611Target_x86_64::do_code_fill(section_size_type length) const
2e30d253
ILT		 2612{
2613 if (length >= 16)
2614 {
2615 // Build a jmpq instruction to skip over the bytes.
2616 unsigned char jmp[5];
2617 jmp[0] = 0xe9;
04bf7072 2618 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
2e30d253
ILT		 2619 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
2620 + std::string(length - 5, '\0'));
2621 }
2622
2623 // Nop sequences of various lengths.
2624 const char nop1[1] = { 0x90 }; // nop
2625 const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax
1caf2c51
ILT		 2626 const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax)
2627 const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax)
2628 const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1)
2629 0x00 };
2630 const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1)
2e30d253 2631 0x00, 0x00 };
1caf2c51 2632 const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax)
2e30d253 2633 0x00, 0x00, 0x00 };
1caf2c51
ILT		 2634 const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1)
2635 0x00, 0x00, 0x00, 0x00 };
2636 const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1)
2637 0x00, 0x00, 0x00, 0x00,
2e30d253 2638 0x00 };
1caf2c51
ILT		 2639 const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1)
2640 0x84, 0x00, 0x00, 0x00,
2e30d253 2641 0x00, 0x00 };
1caf2c51
ILT		 2642 const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16
2643 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2e30d253 2644 0x00, 0x00, 0x00 };
1caf2c51
ILT		 2645 const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16
2646 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1)
2e30d253 2647 0x00, 0x00, 0x00, 0x00 };
1caf2c51
ILT		 2648 const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2649 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1)
2650 0x00, 0x00, 0x00, 0x00,
2e30d253 2651 0x00 };
1caf2c51
ILT		 2652 const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2653 0x66, 0x2e, 0x0f, 0x1f, // data16
2654 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2e30d253 2655 0x00, 0x00 };
1caf2c51
ILT		 2656 const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16
2657 0x66, 0x66, 0x2e, 0x0f, // data16; data16
2658 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1)
2659 0x00, 0x00, 0x00 };
2e30d253
ILT		 2660
2661 const char* nops[16] = {
2662 NULL,
2663 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
2664 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
2665 };
2666
2667 return std::string(nops[length], length);
2668}
2669
364c7fa5
ILT		 2670// FNOFFSET in section SHNDX in OBJECT is the start of a function
2671// compiled with -fstack-split. The function calls non-stack-split
2672// code. We have to change the function so that it always ensures
2673// that it has enough stack space to run some random function.
2674
2675void
2676Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx,
2677 section_offset_type fnoffset,
2678 section_size_type fnsize,
2679 unsigned char* view,
2680 section_size_type view_size,
2681 std::string* from,
2682 std::string* to) const
2683{
2684 // The function starts with a comparison of the stack pointer and a
2685 // field in the TCB. This is followed by a jump.
2686
2687 // cmp %fs:NN,%rsp
2688 if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5)
2689 && fnsize > 9)
2690 {
2691 // We will call __morestack if the carry flag is set after this
2692 // comparison. We turn the comparison into an stc instruction
2693 // and some nops.
2694 view[fnoffset] = '\xf9';
2695 this->set_view_to_nop(view, view_size, fnoffset + 1, 8);
2696 }
2697 // lea NN(%rsp),%r10
cbc999b9
ILT		 2698 // lea NN(%rsp),%r11
2699 else if ((this->match_view(view, view_size, fnoffset,
2700 "\x4c\x8d\x94\x24", 4)
2701 || this->match_view(view, view_size, fnoffset,
2702 "\x4c\x8d\x9c\x24", 4))
364c7fa5
ILT		 2703 && fnsize > 8)
2704 {
2705 // This is loading an offset from the stack pointer for a
2706 // comparison. The offset is negative, so we decrease the
2707 // offset by the amount of space we need for the stack. This
2708 // means we will avoid calling __morestack if there happens to
2709 // be plenty of space on the stack already.
2710 unsigned char* pval = view + fnoffset + 4;
2711 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
2712 val -= parameters->options().split_stack_adjust_size();
2713 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
2714 }
2715 else
2716 {
2717 if (!object->has_no_split_stack())
2718 object->error(_("failed to match split-stack sequence at "
2719 "section %u offset %0zx"),
ac33a407 2720 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 2721 return;
2722 }
2723
2724 // We have to change the function so that it calls
2725 // __morestack_non_split instead of __morestack. The former will
2726 // allocate additional stack space.
2727 *from = "__morestack";
2728 *to = "__morestack_non_split";
2729}
2730
2e30d253
ILT		 2731// The selector for x86_64 object files.
2732
36959681 2733class Target_selector_x86_64 : public Target_selector_freebsd
2e30d253
ILT		 2734{
2735public:
2736 Target_selector_x86_64()
36959681
ILT		 2737 : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64",
2738 "elf64-x86-64-freebsd")
2e30d253
ILT		 2739 { }
2740
2741 Target*
e96caa79
ILT		 2742 do_instantiate_target()
2743 { return new Target_x86_64(); }
36959681 2744
2e30d253
ILT		 2745};
2746
2e30d253
ILT		 2747Target_selector_x86_64 target_selector_x86_64;
2748
2749} // End anonymous namespace.
GDB Binutils - Deliverables
This page took 0.258758 seconds and 4 git commands to generate.