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* object.cc (Sized_relobj_file::include_section_group): Add
[deliverable/binutils-gdb.git] / gold / i386.cc
CommitLineData
14bfc3f5
ILT		 1// i386.cc -- i386 target support for gold.
2
b3ce541e 3// Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
6cb15b7f
ILT		 4// Written by Ian Lance Taylor <iant@google.com>.
5
6// This file is part of gold.
7
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
11// (at your option) any later version.
12
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.
22
14bfc3f5 23#include "gold.h"
ead1e424
ILT		 24
25#include <cstring>
26
14bfc3f5 27#include "elfcpp.h"
07a60597 28#include "dwarf.h"
7e1edb90 29#include "parameters.h"
92e059d8 30#include "reloc.h"
61ba1cf9
ILT		 31#include "i386.h"
32#include "object.h"
ead1e424 33#include "symtab.h"
92e059d8
ILT		 34#include "layout.h"
35#include "output.h"
12c0daef 36#include "copy-relocs.h"
14bfc3f5 37#include "target.h"
61ba1cf9 38#include "target-reloc.h"
14bfc3f5 39#include "target-select.h"
af6359d5 40#include "tls.h"
36959681 41#include "freebsd.h"
f345227a 42#include "gc.h"
14bfc3f5
ILT		 43
44namespace
45{
46
47using namespace gold;
48
7223e9ca
ILT		 49// A class to handle the PLT data.
50
51class Output_data_plt_i386 : public Output_section_data
52{
53 public:
54 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
55
56 Output_data_plt_i386(Symbol_table*, Layout*, Output_data_space*);
57
58 // Add an entry to the PLT.
59 void
60 add_entry(Symbol* gsym);
61
62 // Add an entry to the PLT for a local STT_GNU_IFUNC symbol.
63 unsigned int
6fa2a40b 64 add_local_ifunc_entry(Sized_relobj_file<32, false>* relobj,
7223e9ca
ILT		 65 unsigned int local_sym_index);
66
67 // Return the .rel.plt section data.
68 Reloc_section*
69 rel_plt() const
70 { return this->rel_; }
71
72 // Return where the TLS_DESC relocations should go.
73 Reloc_section*
74 rel_tls_desc(Layout*);
75
76 // Return the number of PLT entries.
77 unsigned int
78 entry_count() const
79 { return this->count_; }
80
81 // Return the offset of the first non-reserved PLT entry.
82 static unsigned int
83 first_plt_entry_offset()
84 { return plt_entry_size; }
85
86 // Return the size of a PLT entry.
87 static unsigned int
88 get_plt_entry_size()
89 { return plt_entry_size; }
90
91 protected:
92 void
93 do_adjust_output_section(Output_section* os);
94
95 // Write to a map file.
96 void
97 do_print_to_mapfile(Mapfile* mapfile) const
98 { mapfile->print_output_data(this, _("** PLT")); }
99
100 private:
101 // The size of an entry in the PLT.
102 static const int plt_entry_size = 16;
103
104 // The first entry in the PLT for an executable.
07a60597 105 static const unsigned char exec_first_plt_entry[plt_entry_size];
7223e9ca
ILT		 106
107 // The first entry in the PLT for a shared object.
07a60597 108 static const unsigned char dyn_first_plt_entry[plt_entry_size];
7223e9ca
ILT		 109
110 // Other entries in the PLT for an executable.
07a60597 111 static const unsigned char exec_plt_entry[plt_entry_size];
7223e9ca
ILT		 112
113 // Other entries in the PLT for a shared object.
07a60597
ILT		 114 static const unsigned char dyn_plt_entry[plt_entry_size];
115
116 // The .eh_frame unwind information for the PLT.
117 static const int plt_eh_frame_cie_size = 16;
118 static const int plt_eh_frame_fde_size = 32;
119 static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size];
120 static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size];
7223e9ca
ILT		 121
122 // Set the final size.
123 void
124 set_final_data_size()
125 { this->set_data_size((this->count_ + 1) * plt_entry_size); }
126
127 // Write out the PLT data.
128 void
129 do_write(Output_file*);
130
131 // We keep a list of global STT_GNU_IFUNC symbols, each with its
132 // offset in the GOT.
133 struct Global_ifunc
134 {
135 Symbol* sym;
136 unsigned int got_offset;
137 };
138
139 // We keep a list of local STT_GNU_IFUNC symbols, each with its
140 // offset in the GOT.
141 struct Local_ifunc
142 {
6fa2a40b 143 Sized_relobj_file<32, false>* object;
7223e9ca
ILT		 144 unsigned int local_sym_index;
145 unsigned int got_offset;
146 };
147
148 // The reloc section.
149 Reloc_section* rel_;
150 // The TLS_DESC relocations, if necessary. These must follow the
151 // regular PLT relocs.
152 Reloc_section* tls_desc_rel_;
153 // The .got.plt section.
154 Output_data_space* got_plt_;
155 // The number of PLT entries.
156 unsigned int count_;
157 // Global STT_GNU_IFUNC symbols.
158 std::vector<Global_ifunc> global_ifuncs_;
159 // Local STT_GNU_IFUNC symbols.
160 std::vector<Local_ifunc> local_ifuncs_;
161};
a3ad94ed 162
14bfc3f5 163// The i386 target class.
e041f13d
ILT		 164// TLS info comes from
165// http://people.redhat.com/drepper/tls.pdf
166// http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt
14bfc3f5 167
200b2bb9 168class Target_i386 : public Sized_target<32, false>
14bfc3f5
ILT		 169{
170 public:
5a6f7e2d
ILT		 171 typedef Output_data_reloc<elfcpp::SHT_REL, true, 32, false> Reloc_section;
172
14bfc3f5 173 Target_i386()
200b2bb9 174 : Sized_target<32, false>(&i386_info),
a8df5856
ILT		 175 got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL),
176 global_offset_table_(NULL), rel_dyn_(NULL),
177 copy_relocs_(elfcpp::R_386_COPY), dynbss_(NULL),
edfbb029 178 got_mod_index_offset_(-1U), tls_base_symbol_defined_(false)
14bfc3f5 179 { }
75f65a3e 180
6d03d481
ST		 181 // Process the relocations to determine unreferenced sections for
182 // garbage collection.
183 void
ad0f2072 184 gc_process_relocs(Symbol_table* symtab,
6d03d481 185 Layout* layout,
6fa2a40b 186 Sized_relobj_file<32, false>* object,
6d03d481
ST		 187 unsigned int data_shndx,
188 unsigned int sh_type,
189 const unsigned char* prelocs,
190 size_t reloc_count,
191 Output_section* output_section,
192 bool needs_special_offset_handling,
193 size_t local_symbol_count,
194 const unsigned char* plocal_symbols);
195
92e059d8 196 // Scan the relocations to look for symbol adjustments.
61ba1cf9 197 void
ad0f2072 198 scan_relocs(Symbol_table* symtab,
ead1e424 199 Layout* layout,
6fa2a40b 200 Sized_relobj_file<32, false>* object,
a3ad94ed 201 unsigned int data_shndx,
92e059d8
ILT		 202 unsigned int sh_type,
203 const unsigned char* prelocs,
204 size_t reloc_count,
730cdc88
ILT		 205 Output_section* output_section,
206 bool needs_special_offset_handling,
92e059d8 207 size_t local_symbol_count,
730cdc88 208 const unsigned char* plocal_symbols);
61ba1cf9 209
5a6f7e2d
ILT		 210 // Finalize the sections.
211 void
f59f41f3 212 do_finalize_sections(Layout*, const Input_objects*, Symbol_table*);
5a6f7e2d 213
ab5c9e90
ILT		 214 // Return the value to use for a dynamic which requires special
215 // treatment.
216 uint64_t
217 do_dynsym_value(const Symbol*) const;
218
92e059d8
ILT		 219 // Relocate a section.
220 void
221 relocate_section(const Relocate_info<32, false>*,
222 unsigned int sh_type,
223 const unsigned char* prelocs,
224 size_t reloc_count,
730cdc88
ILT		 225 Output_section* output_section,
226 bool needs_special_offset_handling,
92e059d8
ILT		 227 unsigned char* view,
228 elfcpp::Elf_types<32>::Elf_Addr view_address,
364c7fa5
ILT		 229 section_size_type view_size,
230 const Reloc_symbol_changes*);
92e059d8 231
6a74a719
ILT		 232 // Scan the relocs during a relocatable link.
233 void
ad0f2072 234 scan_relocatable_relocs(Symbol_table* symtab,
6a74a719 235 Layout* layout,
6fa2a40b 236 Sized_relobj_file<32, false>* object,
6a74a719
ILT		 237 unsigned int data_shndx,
238 unsigned int sh_type,
239 const unsigned char* prelocs,
240 size_t reloc_count,
241 Output_section* output_section,
242 bool needs_special_offset_handling,
243 size_t local_symbol_count,
244 const unsigned char* plocal_symbols,
245 Relocatable_relocs*);
246
247 // Relocate a section during a relocatable link.
248 void
249 relocate_for_relocatable(const Relocate_info<32, false>*,
250 unsigned int sh_type,
251 const unsigned char* prelocs,
252 size_t reloc_count,
253 Output_section* output_section,
254 off_t offset_in_output_section,
255 const Relocatable_relocs*,
256 unsigned char* view,
257 elfcpp::Elf_types<32>::Elf_Addr view_address,
258 section_size_type view_size,
259 unsigned char* reloc_view,
260 section_size_type reloc_view_size);
261
c51e6221
ILT		 262 // Return a string used to fill a code section with nops.
263 std::string
8851ecca 264 do_code_fill(section_size_type length) const;
c51e6221 265
9a2d6984
ILT		 266 // Return whether SYM is defined by the ABI.
267 bool
9c2d0ef9 268 do_is_defined_by_abi(const Symbol* sym) const
9a2d6984
ILT		 269 { return strcmp(sym->name(), "___tls_get_addr") == 0; }
270
bb04269c
DK		 271 // Return whether a symbol name implies a local label. The UnixWare
272 // 2.1 cc generates temporary symbols that start with .X, so we
273 // recognize them here. FIXME: do other SVR4 compilers also use .X?.
274 // If so, we should move the .X recognition into
275 // Target::do_is_local_label_name.
276 bool
277 do_is_local_label_name(const char* name) const
278 {
279 if (name[0] == '.' && name[1] == 'X')
280 return true;
281 return Target::do_is_local_label_name(name);
282 }
283
7223e9ca
ILT		 284 // Return the PLT section.
285 Output_data*
286 do_plt_section_for_global(const Symbol*) const
287 { return this->plt_section(); }
288
289 Output_data*
290 do_plt_section_for_local(const Relobj*, unsigned int) const
291 { return this->plt_section(); }
292
b3ce541e
ILT		 293 // We can tell whether we take the address of a function.
294 inline bool
295 do_can_check_for_function_pointers() const
296 { return true; }
297
02d7cd44
ILT		 298 // Return the base for a DW_EH_PE_datarel encoding.
299 uint64_t
300 do_ehframe_datarel_base() const;
301
b6848d3c
ILT		 302 // Return whether SYM is call to a non-split function.
303 bool
304 do_is_call_to_non_split(const Symbol* sym, unsigned int) const;
305
9b547ce6 306 // Adjust -fsplit-stack code which calls non-split-stack code.
364c7fa5
ILT		 307 void
308 do_calls_non_split(Relobj* object, unsigned int shndx,
309 section_offset_type fnoffset, section_size_type fnsize,
310 unsigned char* view, section_size_type view_size,
311 std::string* from, std::string* to) const;
312
96f2030e 313 // Return the size of the GOT section.
fe8718a4 314 section_size_type
0e70b911 315 got_size() const
96f2030e
ILT		 316 {
317 gold_assert(this->got_ != NULL);
318 return this->got_->data_size();
319 }
320
0e70b911
CC		 321 // Return the number of entries in the GOT.
322 unsigned int
323 got_entry_count() const
324 {
325 if (this->got_ == NULL)
326 return 0;
327 return this->got_size() / 4;
328 }
329
330 // Return the number of entries in the PLT.
331 unsigned int
332 plt_entry_count() const;
333
334 // Return the offset of the first non-reserved PLT entry.
335 unsigned int
336 first_plt_entry_offset() const;
337
338 // Return the size of each PLT entry.
339 unsigned int
340 plt_entry_size() const;
341
92e059d8
ILT		 342 private:
343 // The class which scans relocations.
344 struct Scan
61ba1cf9 345 {
95a2c8d6
RS		 346 static inline int
347
348 get_reference_flags(unsigned int r_type);
349
61ba1cf9 350 inline void
ad0f2072 351 local(Symbol_table* symtab, Layout* layout, Target_i386* target,
6fa2a40b 352 Sized_relobj_file<32, false>* object,
a3ad94ed 353 unsigned int data_shndx,
07f397ab 354 Output_section* output_section,
92e059d8
ILT		 355 const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
356 const elfcpp::Sym<32, false>& lsym);
61ba1cf9 357
92e059d8 358 inline void
ad0f2072 359 global(Symbol_table* symtab, Layout* layout, Target_i386* target,
6fa2a40b 360 Sized_relobj_file<32, false>* object,
a3ad94ed 361 unsigned int data_shndx,
07f397ab 362 Output_section* output_section,
92e059d8
ILT		 363 const elfcpp::Rel<32, false>& reloc, unsigned int r_type,
364 Symbol* gsym);
af6359d5 365
21bb3914 366 inline bool
0897ed3b
ST		 367 local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
368 Target_i386* target,
6fa2a40b 369 Sized_relobj_file<32, false>* object,
0897ed3b
ST		 370 unsigned int data_shndx,
371 Output_section* output_section,
372 const elfcpp::Rel<32, false>& reloc,
373 unsigned int r_type,
374 const elfcpp::Sym<32, false>& lsym);
375
376 inline bool
377 global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout,
378 Target_i386* target,
6fa2a40b 379 Sized_relobj_file<32, false>* object,
0897ed3b
ST		 380 unsigned int data_shndx,
381 Output_section* output_section,
382 const elfcpp::Rel<32, false>& reloc,
383 unsigned int r_type,
384 Symbol* gsym);
21bb3914
ST		 385
386 inline bool
0897ed3b 387 possible_function_pointer_reloc(unsigned int r_type);
21bb3914 388
7223e9ca 389 bool
6fa2a40b
CC		 390 reloc_needs_plt_for_ifunc(Sized_relobj_file<32, false>*,
391 unsigned int r_type);
7223e9ca 392
af6359d5 393 static void
6fa2a40b 394 unsupported_reloc_local(Sized_relobj_file<32, false>*, unsigned int r_type);
af6359d5
ILT		 395
396 static void
6fa2a40b 397 unsupported_reloc_global(Sized_relobj_file<32, false>*, unsigned int r_type,
af6359d5 398 Symbol*);
61ba1cf9
ILT		 399 };
400
92e059d8
ILT		 401 // The class which implements relocation.
402 class Relocate
403 {
404 public:
ead1e424 405 Relocate()
46cf9fa2 406 : skip_call_tls_get_addr_(false),
82bb573a 407 local_dynamic_type_(LOCAL_DYNAMIC_NONE)
ead1e424
ILT		 408 { }
409
410 ~Relocate()
411 {
412 if (this->skip_call_tls_get_addr_)
413 {
414 // FIXME: This needs to specify the location somehow.
75f2446e 415 gold_error(_("missing expected TLS relocation"));
ead1e424
ILT		 416 }
417 }
418
86849f1f
ILT		 419 // Return whether the static relocation needs to be applied.
420 inline bool
421 should_apply_static_reloc(const Sized_symbol<32>* gsym,
95a2c8d6 422 unsigned int r_type,
031cdbed
ILT		 423 bool is_32bit,
424 Output_section* output_section);
86849f1f 425
ead1e424
ILT		 426 // Do a relocation. Return false if the caller should not issue
427 // any warnings about this relocation.
428 inline bool
031cdbed
ILT		 429 relocate(const Relocate_info<32, false>*, Target_i386*, Output_section*,
430 size_t relnum, const elfcpp::Rel<32, false>&,
c06b7b0b 431 unsigned int r_type, const Sized_symbol<32>*,
b8e6aad9 432 const Symbol_value<32>*,
92e059d8 433 unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
fe8718a4 434 section_size_type);
92e059d8
ILT		 435
436 private:
437 // Do a TLS relocation.
ead1e424 438 inline void
07f397ab
ILT		 439 relocate_tls(const Relocate_info<32, false>*, Target_i386* target,
440 size_t relnum, const elfcpp::Rel<32, false>&,
c06b7b0b 441 unsigned int r_type, const Sized_symbol<32>*,
b8e6aad9 442 const Symbol_value<32>*,
fe8718a4
ILT		 443 unsigned char*, elfcpp::Elf_types<32>::Elf_Addr,
444 section_size_type);
92e059d8 445
07f397ab
ILT		 446 // Do a TLS General-Dynamic to Initial-Exec transition.
447 inline void
448 tls_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
449 Output_segment* tls_segment,
450 const elfcpp::Rel<32, false>&, unsigned int r_type,
451 elfcpp::Elf_types<32>::Elf_Addr value,
452 unsigned char* view,
fe8718a4 453 section_size_type view_size);
07f397ab 454
56622147
ILT		 455 // Do a TLS General-Dynamic to Local-Exec transition.
456 inline void
457 tls_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
92e059d8
ILT		 458 Output_segment* tls_segment,
459 const elfcpp::Rel<32, false>&, unsigned int r_type,
460 elfcpp::Elf_types<32>::Elf_Addr value,
461 unsigned char* view,
fe8718a4 462 section_size_type view_size);
92e059d8 463
c2b45e22
CC		 464 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Initial-Exec
465 // transition.
466 inline void
467 tls_desc_gd_to_ie(const Relocate_info<32, false>*, size_t relnum,
468 Output_segment* tls_segment,
469 const elfcpp::Rel<32, false>&, unsigned int r_type,
470 elfcpp::Elf_types<32>::Elf_Addr value,
471 unsigned char* view,
472 section_size_type view_size);
473
474 // Do a TLS_GOTDESC or TLS_DESC_CALL General-Dynamic to Local-Exec
475 // transition.
476 inline void
477 tls_desc_gd_to_le(const Relocate_info<32, false>*, size_t relnum,
478 Output_segment* tls_segment,
479 const elfcpp::Rel<32, false>&, unsigned int r_type,
480 elfcpp::Elf_types<32>::Elf_Addr value,
481 unsigned char* view,
482 section_size_type view_size);
483
56622147 484 // Do a TLS Local-Dynamic to Local-Exec transition.
ead1e424 485 inline void
56622147 486 tls_ld_to_le(const Relocate_info<32, false>*, size_t relnum,
ead1e424
ILT		 487 Output_segment* tls_segment,
488 const elfcpp::Rel<32, false>&, unsigned int r_type,
489 elfcpp::Elf_types<32>::Elf_Addr value,
490 unsigned char* view,
fe8718a4 491 section_size_type view_size);
ead1e424 492
56622147
ILT		 493 // Do a TLS Initial-Exec to Local-Exec transition.
494 static inline void
495 tls_ie_to_le(const Relocate_info<32, false>*, size_t relnum,
46cf9fa2
ILT		 496 Output_segment* tls_segment,
497 const elfcpp::Rel<32, false>&, unsigned int r_type,
498 elfcpp::Elf_types<32>::Elf_Addr value,
499 unsigned char* view,
fe8718a4 500 section_size_type view_size);
46cf9fa2 501
46cf9fa2
ILT		 502 // We need to keep track of which type of local dynamic relocation
503 // we have seen, so that we can optimize R_386_TLS_LDO_32 correctly.
504 enum Local_dynamic_type
505 {
506 LOCAL_DYNAMIC_NONE,
507 LOCAL_DYNAMIC_SUN,
508 LOCAL_DYNAMIC_GNU
509 };
510
ead1e424
ILT		 511 // This is set if we should skip the next reloc, which should be a
512 // PLT32 reloc against ___tls_get_addr.
513 bool skip_call_tls_get_addr_;
46cf9fa2
ILT		 514 // The type of local dynamic relocation we have seen in the section
515 // being relocated, if any.
516 Local_dynamic_type local_dynamic_type_;
92e059d8
ILT		 517 };
518
6a74a719
ILT		 519 // A class which returns the size required for a relocation type,
520 // used while scanning relocs during a relocatable link.
521 class Relocatable_size_for_reloc
522 {
523 public:
524 unsigned int
525 get_size_for_reloc(unsigned int, Relobj*);
526 };
527
92e059d8
ILT		 528 // Adjust TLS relocation type based on the options and whether this
529 // is a local symbol.
af6359d5 530 static tls::Tls_optimization
7e1edb90 531 optimize_tls_reloc(bool is_final, int r_type);
92e059d8 532
ead1e424 533 // Get the GOT section, creating it if necessary.
dbe717ef 534 Output_data_got<32, false>*
7e1edb90 535 got_section(Symbol_table*, Layout*);
a3ad94ed 536
96f2030e
ILT		 537 // Get the GOT PLT section.
538 Output_data_space*
539 got_plt_section() const
540 {
541 gold_assert(this->got_plt_ != NULL);
542 return this->got_plt_;
543 }
544
a8df5856
ILT		 545 // Get the GOT section for TLSDESC entries.
546 Output_data_got<32, false>*
547 got_tlsdesc_section() const
548 {
549 gold_assert(this->got_tlsdesc_ != NULL);
550 return this->got_tlsdesc_;
551 }
552
7223e9ca
ILT		 553 // Create the PLT section.
554 void
555 make_plt_section(Symbol_table* symtab, Layout* layout);
556
a3ad94ed
ILT		 557 // Create a PLT entry for a global symbol.
558 void
7e1edb90 559 make_plt_entry(Symbol_table*, Layout*, Symbol*);
a3ad94ed 560
7223e9ca
ILT		 561 // Create a PLT entry for a local STT_GNU_IFUNC symbol.
562 void
563 make_local_ifunc_plt_entry(Symbol_table*, Layout*,
6fa2a40b 564 Sized_relobj_file<32, false>* relobj,
7223e9ca
ILT		 565 unsigned int local_sym_index);
566
9fa33bee 567 // Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 568 void
569 define_tls_base_symbol(Symbol_table*, Layout*);
570
94c4710f
ILT		 571 // Create a GOT entry for the TLS module index.
572 unsigned int
573 got_mod_index_entry(Symbol_table* symtab, Layout* layout,
6fa2a40b 574 Sized_relobj_file<32, false>* object);
94c4710f 575
a3ad94ed 576 // Get the PLT section.
e291e7b9 577 Output_data_plt_i386*
a3ad94ed
ILT		 578 plt_section() const
579 {
580 gold_assert(this->plt_ != NULL);
581 return this->plt_;
582 }
583
5a6f7e2d
ILT		 584 // Get the dynamic reloc section, creating it if necessary.
585 Reloc_section*
586 rel_dyn_section(Layout*);
587
e291e7b9
ILT		 588 // Get the section to use for TLS_DESC relocations.
589 Reloc_section*
590 rel_tls_desc_section(Layout*) const;
591
12c0daef 592 // Add a potential copy relocation.
a3ad94ed 593 void
ef9beddf 594 copy_reloc(Symbol_table* symtab, Layout* layout,
6fa2a40b 595 Sized_relobj_file<32, false>* object,
12c0daef
ILT		 596 unsigned int shndx, Output_section* output_section,
597 Symbol* sym, const elfcpp::Rel<32, false>& reloc)
598 {
599 this->copy_relocs_.copy_reloc(symtab, layout,
600 symtab->get_sized_symbol<32>(sym),
601 object, shndx, output_section, reloc,
602 this->rel_dyn_section(layout));
603 }
ead1e424 604
92e059d8
ILT		 605 // Information about this specific target which we pass to the
606 // general Target structure.
75f65a3e 607 static const Target::Target_info i386_info;
ead1e424 608
0a65a3a7 609 // The types of GOT entries needed for this platform.
0e70b911
CC		 610 // These values are exposed to the ABI in an incremental link.
611 // Do not renumber existing values without changing the version
612 // number of the .gnu_incremental_inputs section.
0a65a3a7
CC		 613 enum Got_type
614 {
615 GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol
c2b45e22
CC		 616 GOT_TYPE_TLS_NOFFSET = 1, // GOT entry for negative TLS offset
617 GOT_TYPE_TLS_OFFSET = 2, // GOT entry for positive TLS offset
618 GOT_TYPE_TLS_PAIR = 3, // GOT entry for TLS module/offset pair
619 GOT_TYPE_TLS_DESC = 4 // GOT entry for TLS_DESC pair
0a65a3a7
CC		 620 };
621
ead1e424 622 // The GOT section.
dbe717ef 623 Output_data_got<32, false>* got_;
a3ad94ed
ILT		 624 // The PLT section.
625 Output_data_plt_i386* plt_;
626 // The GOT PLT section.
627 Output_data_space* got_plt_;
a8df5856
ILT		 628 // The GOT section for TLSDESC relocations.
629 Output_data_got<32, false>* got_tlsdesc_;
e785ec03
ILT		 630 // The _GLOBAL_OFFSET_TABLE_ symbol.
631 Symbol* global_offset_table_;
5a6f7e2d
ILT		 632 // The dynamic reloc section.
633 Reloc_section* rel_dyn_;
634 // Relocs saved to avoid a COPY reloc.
12c0daef 635 Copy_relocs<elfcpp::SHT_REL, 32, false> copy_relocs_;
5a6f7e2d
ILT		 636 // Space for variables copied with a COPY reloc.
637 Output_data_space* dynbss_;
c2b45e22 638 // Offset of the GOT entry for the TLS module index.
94c4710f 639 unsigned int got_mod_index_offset_;
edfbb029
CC		 640 // True if the _TLS_MODULE_BASE_ symbol has been defined.
641 bool tls_base_symbol_defined_;
75f65a3e
ILT		 642};
643
644const Target::Target_info Target_i386::i386_info =
645{
61ba1cf9
ILT		 646 32, // size
647 false, // is_big_endian
648 elfcpp::EM_386, // machine_code
649 false, // has_make_symbol
dbe717ef 650 false, // has_resolve
c51e6221 651 true, // has_code_fill
35cdfc9a 652 true, // is_default_stack_executable
b3ce541e 653 true, // can_icf_inline_merge_sections
0864d551 654 '\0', // wrap_char
dbe717ef 655 "/usr/lib/libc.so.1", // dynamic_linker
0c5e9c22 656 0x08048000, // default_text_segment_address
cd72c291 657 0x1000, // abi_pagesize (overridable by -z max-page-size)
8a5e3e08
ILT		 658 0x1000, // common_pagesize (overridable by -z common-page-size)
659 elfcpp::SHN_UNDEF, // small_common_shndx
660 elfcpp::SHN_UNDEF, // large_common_shndx
661 0, // small_common_section_flags
05a352e6
DK		 662 0, // large_common_section_flags
663 NULL, // attributes_section
664 NULL // attributes_vendor
14bfc3f5
ILT		 665};
666
ead1e424
ILT		 667// Get the GOT section, creating it if necessary.
668
dbe717ef 669Output_data_got<32, false>*
7e1edb90 670Target_i386::got_section(Symbol_table* symtab, Layout* layout)
ead1e424
ILT		 671{
672 if (this->got_ == NULL)
673 {
7e1edb90 674 gold_assert(symtab != NULL && layout != NULL);
a3ad94ed 675
7e1edb90 676 this->got_ = new Output_data_got<32, false>();
ead1e424 677
82742395
ILT		 678 layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS,
679 (elfcpp::SHF_ALLOC
680 | elfcpp::SHF_WRITE),
22f0da72 681 this->got_, ORDER_RELRO_LAST, true);
ead1e424 682
7d9e3d98 683 this->got_plt_ = new Output_data_space(4, "** GOT PLT");
82742395
ILT		 684 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
685 (elfcpp::SHF_ALLOC
686 | elfcpp::SHF_WRITE),
22f0da72
ILT		 687 this->got_plt_, ORDER_NON_RELRO_FIRST,
688 false);
a3ad94ed 689
ead1e424 690 // The first three entries are reserved.
27bc2bce 691 this->got_plt_->set_current_data_size(3 * 4);
ead1e424 692
1a2dff53
ILT		 693 // Those bytes can go into the relro segment.
694 layout->increase_relro(3 * 4);
695
a3ad94ed 696 // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT.
e785ec03
ILT		 697 this->global_offset_table_ =
698 symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL,
699 Symbol_table::PREDEFINED,
700 this->got_plt_,
701 0, 0, elfcpp::STT_OBJECT,
702 elfcpp::STB_LOCAL,
703 elfcpp::STV_HIDDEN, 0,
704 false, false);
a8df5856
ILT		 705
706 // If there are any TLSDESC relocations, they get GOT entries in
707 // .got.plt after the jump slot entries.
708 this->got_tlsdesc_ = new Output_data_got<32, false>();
709 layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS,
710 (elfcpp::SHF_ALLOC
711 | elfcpp::SHF_WRITE),
22f0da72
ILT		 712 this->got_tlsdesc_,
713 ORDER_NON_RELRO_FIRST, false);
ead1e424 714 }
a3ad94ed 715
ead1e424
ILT		 716 return this->got_;
717}
718
5a6f7e2d
ILT		 719// Get the dynamic reloc section, creating it if necessary.
720
721Target_i386::Reloc_section*
722Target_i386::rel_dyn_section(Layout* layout)
723{
724 if (this->rel_dyn_ == NULL)
725 {
726 gold_assert(layout != NULL);
d98bc257 727 this->rel_dyn_ = new Reloc_section(parameters->options().combreloc());
5a6f7e2d 728 layout->add_output_section_data(".rel.dyn", elfcpp::SHT_REL,
22f0da72
ILT		 729 elfcpp::SHF_ALLOC, this->rel_dyn_,
730 ORDER_DYNAMIC_RELOCS, false);
5a6f7e2d
ILT		 731 }
732 return this->rel_dyn_;
733}
734
a3ad94ed
ILT		 735// Create the PLT section. The ordinary .got section is an argument,
736// since we need to refer to the start. We also create our own .got
737// section just for PLT entries.
738
7223e9ca
ILT		 739Output_data_plt_i386::Output_data_plt_i386(Symbol_table* symtab,
740 Layout* layout,
7e1edb90 741 Output_data_space* got_plt)
07a60597 742 : Output_section_data(16), tls_desc_rel_(NULL), got_plt_(got_plt), count_(0),
7223e9ca 743 global_ifuncs_(), local_ifuncs_()
a3ad94ed 744{
d98bc257 745 this->rel_ = new Reloc_section(false);
a3ad94ed 746 layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
22f0da72
ILT		 747 elfcpp::SHF_ALLOC, this->rel_,
748 ORDER_DYNAMIC_PLT_RELOCS, false);
7223e9ca
ILT		 749
750 if (parameters->doing_static_link())
751 {
752 // A statically linked executable will only have a .rel.plt
753 // section to hold R_386_IRELATIVE relocs for STT_GNU_IFUNC
754 // symbols. The library will use these symbols to locate the
755 // IRELATIVE relocs at program startup time.
756 symtab->define_in_output_data("__rel_iplt_start", NULL,
757 Symbol_table::PREDEFINED,
758 this->rel_, 0, 0, elfcpp::STT_NOTYPE,
759 elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN,
760 0, false, true);
761 symtab->define_in_output_data("__rel_iplt_end", NULL,
762 Symbol_table::PREDEFINED,
763 this->rel_, 0, 0, elfcpp::STT_NOTYPE,
764 elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN,
765 0, true, true);
766 }
07a60597
ILT		 767
768 // Add unwind information if requested.
769 if (parameters->options().ld_generated_unwind_info())
770 layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size,
771 plt_eh_frame_fde, plt_eh_frame_fde_size);
a3ad94ed
ILT		 772}
773
16649710
ILT		 774void
775Output_data_plt_i386::do_adjust_output_section(Output_section* os)
776{
777 // UnixWare sets the entsize of .plt to 4, and so does the old GNU
778 // linker, and so do we.
779 os->set_entsize(4);
780}
781
a3ad94ed
ILT		 782// Add an entry to the PLT.
783
784void
785Output_data_plt_i386::add_entry(Symbol* gsym)
786{
787 gold_assert(!gsym->has_plt_offset());
788
789 // Note that when setting the PLT offset we skip the initial
790 // reserved PLT entry.
791 gsym->set_plt_offset((this->count_ + 1) * plt_entry_size);
792
793 ++this->count_;
794
fe8718a4 795 section_offset_type got_offset = this->got_plt_->current_data_size();
a3ad94ed
ILT		 796
797 // Every PLT entry needs a GOT entry which points back to the PLT
798 // entry (this will be changed by the dynamic linker, normally
799 // lazily when the function is called).
27bc2bce 800 this->got_plt_->set_current_data_size(got_offset + 4);
a3ad94ed
ILT		 801
802 // Every PLT entry needs a reloc.
7223e9ca
ILT		 803 if (gsym->type() == elfcpp::STT_GNU_IFUNC
804 && gsym->can_use_relative_reloc(false))
805 {
806 this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_386_IRELATIVE,
807 this->got_plt_, got_offset);
808 struct Global_ifunc gi;
809 gi.sym = gsym;
810 gi.got_offset = got_offset;
811 this->global_ifuncs_.push_back(gi);
812 }
813 else
814 {
815 gsym->set_needs_dynsym_entry();
816 this->rel_->add_global(gsym, elfcpp::R_386_JUMP_SLOT, this->got_plt_,
817 got_offset);
818 }
a3ad94ed
ILT		 819
820 // Note that we don't need to save the symbol. The contents of the
821 // PLT are independent of which symbols are used. The symbols only
822 // appear in the relocations.
823}
824
7223e9ca
ILT		 825// Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return
826// the PLT offset.
827
828unsigned int
6fa2a40b
CC		 829Output_data_plt_i386::add_local_ifunc_entry(
830 Sized_relobj_file<32, false>* relobj,
831 unsigned int local_sym_index)
7223e9ca
ILT		 832{
833 unsigned int plt_offset = (this->count_ + 1) * plt_entry_size;
834 ++this->count_;
835
836 section_offset_type got_offset = this->got_plt_->current_data_size();
837
838 // Every PLT entry needs a GOT entry which points back to the PLT
839 // entry.
840 this->got_plt_->set_current_data_size(got_offset + 4);
841
842 // Every PLT entry needs a reloc.
843 this->rel_->add_symbolless_local_addend(relobj, local_sym_index,
844 elfcpp::R_386_IRELATIVE,
845 this->got_plt_, got_offset);
846
847 struct Local_ifunc li;
848 li.object = relobj;
849 li.local_sym_index = local_sym_index;
850 li.got_offset = got_offset;
851 this->local_ifuncs_.push_back(li);
852
853 return plt_offset;
854}
855
e291e7b9
ILT		 856// Return where the TLS_DESC relocations should go, creating it if
857// necessary. These follow the JUMP_SLOT relocations.
858
859Output_data_plt_i386::Reloc_section*
860Output_data_plt_i386::rel_tls_desc(Layout* layout)
861{
862 if (this->tls_desc_rel_ == NULL)
863 {
864 this->tls_desc_rel_ = new Reloc_section(false);
865 layout->add_output_section_data(".rel.plt", elfcpp::SHT_REL,
866 elfcpp::SHF_ALLOC, this->tls_desc_rel_,
22f0da72 867 ORDER_DYNAMIC_PLT_RELOCS, false);
e291e7b9
ILT		 868 gold_assert(this->tls_desc_rel_->output_section() ==
869 this->rel_->output_section());
870 }
871 return this->tls_desc_rel_;
872}
873
a3ad94ed
ILT		 874// The first entry in the PLT for an executable.
875
07a60597 876const unsigned char Output_data_plt_i386::exec_first_plt_entry[plt_entry_size] =
a3ad94ed
ILT		 877{
878 0xff, 0x35, // pushl contents of memory address
879 0, 0, 0, 0, // replaced with address of .got + 4
880 0xff, 0x25, // jmp indirect
881 0, 0, 0, 0, // replaced with address of .got + 8
882 0, 0, 0, 0 // unused
883};
884
885// The first entry in the PLT for a shared object.
886
07a60597 887const unsigned char Output_data_plt_i386::dyn_first_plt_entry[plt_entry_size] =
a3ad94ed
ILT		 888{
889 0xff, 0xb3, 4, 0, 0, 0, // pushl 4(%ebx)
890 0xff, 0xa3, 8, 0, 0, 0, // jmp *8(%ebx)
891 0, 0, 0, 0 // unused
892};
893
894// Subsequent entries in the PLT for an executable.
895
07a60597 896const unsigned char Output_data_plt_i386::exec_plt_entry[plt_entry_size] =
a3ad94ed
ILT		 897{
898 0xff, 0x25, // jmp indirect
899 0, 0, 0, 0, // replaced with address of symbol in .got
900 0x68, // pushl immediate
901 0, 0, 0, 0, // replaced with offset into relocation table
902 0xe9, // jmp relative
903 0, 0, 0, 0 // replaced with offset to start of .plt
904};
905
906// Subsequent entries in the PLT for a shared object.
907
07a60597 908const unsigned char Output_data_plt_i386::dyn_plt_entry[plt_entry_size] =
a3ad94ed
ILT		 909{
910 0xff, 0xa3, // jmp *offset(%ebx)
911 0, 0, 0, 0, // replaced with offset of symbol in .got
912 0x68, // pushl immediate
913 0, 0, 0, 0, // replaced with offset into relocation table
914 0xe9, // jmp relative
915 0, 0, 0, 0 // replaced with offset to start of .plt
916};
917
07a60597
ILT		 918// The .eh_frame unwind information for the PLT.
919
920const unsigned char
921Output_data_plt_i386::plt_eh_frame_cie[plt_eh_frame_cie_size] =
922{
923 1, // CIE version.
924 'z', // Augmentation: augmentation size included.
925 'R', // Augmentation: FDE encoding included.
926 '\0', // End of augmentation string.
927 1, // Code alignment factor.
928 0x7c, // Data alignment factor.
929 8, // Return address column.
930 1, // Augmentation size.
931 (elfcpp::DW_EH_PE_pcrel // FDE encoding.
932 | elfcpp::DW_EH_PE_sdata4),
933 elfcpp::DW_CFA_def_cfa, 4, 4, // DW_CFA_def_cfa: r4 (esp) ofs 4.
934 elfcpp::DW_CFA_offset + 8, 1, // DW_CFA_offset: r8 (eip) at cfa-4.
935 elfcpp::DW_CFA_nop, // Align to 16 bytes.
936 elfcpp::DW_CFA_nop
937};
938
939const unsigned char
940Output_data_plt_i386::plt_eh_frame_fde[plt_eh_frame_fde_size] =
941{
942 0, 0, 0, 0, // Replaced with offset to .plt.
943 0, 0, 0, 0, // Replaced with size of .plt.
944 0, // Augmentation size.
945 elfcpp::DW_CFA_def_cfa_offset, 8, // DW_CFA_def_cfa_offset: 8.
946 elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6.
947 elfcpp::DW_CFA_def_cfa_offset, 12, // DW_CFA_def_cfa_offset: 12.
948 elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16.
949 elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression.
950 11, // Block length.
951 elfcpp::DW_OP_breg4, 4, // Push %esp + 4.
952 elfcpp::DW_OP_breg8, 0, // Push %eip.
953 elfcpp::DW_OP_lit15, // Push 0xf.
954 elfcpp::DW_OP_and, // & (%eip & 0xf).
955 elfcpp::DW_OP_lit11, // Push 0xb.
956 elfcpp::DW_OP_ge, // >= ((%eip & 0xf) >= 0xb)
957 elfcpp::DW_OP_lit2, // Push 2.
958 elfcpp::DW_OP_shl, // << (((%eip & 0xf) >= 0xb) << 2)
491f21ca 959 elfcpp::DW_OP_plus, // + ((((%eip&0xf)>=0xb)<<2)+%esp+4
07a60597
ILT		 960 elfcpp::DW_CFA_nop, // Align to 32 bytes.
961 elfcpp::DW_CFA_nop,
962 elfcpp::DW_CFA_nop,
963 elfcpp::DW_CFA_nop
964};
965
a3ad94ed
ILT		 966// Write out the PLT. This uses the hand-coded instructions above,
967// and adjusts them as needed. This is all specified by the i386 ELF
968// Processor Supplement.
969
970void
971Output_data_plt_i386::do_write(Output_file* of)
972{
2ea97941 973 const off_t offset = this->offset();
fe8718a4
ILT		 974 const section_size_type oview_size =
975 convert_to_section_size_type(this->data_size());
2ea97941 976 unsigned char* const oview = of->get_output_view(offset, oview_size);
a3ad94ed
ILT		 977
978 const off_t got_file_offset = this->got_plt_->offset();
fe8718a4
ILT		 979 const section_size_type got_size =
980 convert_to_section_size_type(this->got_plt_->data_size());
a3ad94ed
ILT		 981 unsigned char* const got_view = of->get_output_view(got_file_offset,
982 got_size);
983
984 unsigned char* pov = oview;
985
986 elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address();
987 elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address();
988
374ad285 989 if (parameters->options().output_is_position_independent())
a3ad94ed
ILT		 990 memcpy(pov, dyn_first_plt_entry, plt_entry_size);
991 else
992 {
993 memcpy(pov, exec_first_plt_entry, plt_entry_size);
994 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 4);
995 elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 8);
996 }
997 pov += plt_entry_size;
998
999 unsigned char* got_pov = got_view;
1000
1001 memset(got_pov, 0, 12);
1002 got_pov += 12;
1003
1004 const int rel_size = elfcpp::Elf_sizes<32>::rel_size;
1005
1006 unsigned int plt_offset = plt_entry_size;
1007 unsigned int plt_rel_offset = 0;
1008 unsigned int got_offset = 12;
1009 const unsigned int count = this->count_;
1010 for (unsigned int i = 0;
1011 i < count;
1012 ++i,
1013 pov += plt_entry_size,
1014 got_pov += 4,
1015 plt_offset += plt_entry_size,
1016 plt_rel_offset += rel_size,
1017 got_offset += 4)
1018 {
1019 // Set and adjust the PLT entry itself.
1020
374ad285 1021 if (parameters->options().output_is_position_independent())
a3ad94ed
ILT		 1022 {
1023 memcpy(pov, dyn_plt_entry, plt_entry_size);
1024 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset);
1025 }
1026 else
1027 {
1028 memcpy(pov, exec_plt_entry, plt_entry_size);
1029 elfcpp::Swap_unaligned<32, false>::writeval(pov + 2,
1030 (got_address
1031 + got_offset));
1032 }
1033
1034 elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_rel_offset);
1035 elfcpp::Swap<32, false>::writeval(pov + 12,
1036 - (plt_offset + plt_entry_size));
1037
1038 // Set the entry in the GOT.
1039 elfcpp::Swap<32, false>::writeval(got_pov, plt_address + plt_offset + 6);
1040 }
1041
7223e9ca
ILT		 1042 // If any STT_GNU_IFUNC symbols have PLT entries, we need to change
1043 // the GOT to point to the actual symbol value, rather than point to
1044 // the PLT entry. That will let the dynamic linker call the right
1045 // function when resolving IRELATIVE relocations.
1046 for (std::vector<Global_ifunc>::const_iterator p =
1047 this->global_ifuncs_.begin();
1048 p != this->global_ifuncs_.end();
1049 ++p)
1050 {
1051 const Sized_symbol<32>* ssym =
1052 static_cast<const Sized_symbol<32>*>(p->sym);
1053 elfcpp::Swap<32, false>::writeval(got_view + p->got_offset,
1054 ssym->value());
1055 }
1056
1057 for (std::vector<Local_ifunc>::const_iterator p =
1058 this->local_ifuncs_.begin();
1059 p != this->local_ifuncs_.end();
1060 ++p)
1061 {
1062 const Symbol_value<32>* psymval =
1063 p->object->local_symbol(p->local_sym_index);
1064 elfcpp::Swap<32, false>::writeval(got_view + p->got_offset,
1065 psymval->value(p->object, 0));
1066 }
1067
fe8718a4
ILT		 1068 gold_assert(static_cast<section_size_type>(pov - oview) == oview_size);
1069 gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size);
a3ad94ed 1070
2ea97941 1071 of->write_output_view(offset, oview_size, oview);
a3ad94ed
ILT		 1072 of->write_output_view(got_file_offset, got_size, got_view);
1073}
1074
7223e9ca 1075// Create the PLT section.
a3ad94ed
ILT		 1076
1077void
7223e9ca 1078Target_i386::make_plt_section(Symbol_table* symtab, Layout* layout)
a3ad94ed 1079{
a3ad94ed
ILT		 1080 if (this->plt_ == NULL)
1081 {
1082 // Create the GOT sections first.
7e1edb90 1083 this->got_section(symtab, layout);
a3ad94ed 1084
7223e9ca 1085 this->plt_ = new Output_data_plt_i386(symtab, layout, this->got_plt_);
16649710
ILT		 1086 layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS,
1087 (elfcpp::SHF_ALLOC
1088 | elfcpp::SHF_EXECINSTR),
22f0da72 1089 this->plt_, ORDER_PLT, false);
7223e9ca
ILT		 1090
1091 // Make the sh_info field of .rel.plt point to .plt.
1092 Output_section* rel_plt_os = this->plt_->rel_plt()->output_section();
1093 rel_plt_os->set_info_section(this->plt_->output_section());
a3ad94ed 1094 }
7223e9ca 1095}
a3ad94ed 1096
7223e9ca
ILT		 1097// Create a PLT entry for a global symbol.
1098
1099void
1100Target_i386::make_plt_entry(Symbol_table* symtab, Layout* layout, Symbol* gsym)
1101{
1102 if (gsym->has_plt_offset())
1103 return;
1104 if (this->plt_ == NULL)
1105 this->make_plt_section(symtab, layout);
a3ad94ed
ILT		 1106 this->plt_->add_entry(gsym);
1107}
1108
7223e9ca
ILT		 1109// Make a PLT entry for a local STT_GNU_IFUNC symbol.
1110
1111void
1112Target_i386::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout,
6fa2a40b 1113 Sized_relobj_file<32, false>* relobj,
7223e9ca
ILT		 1114 unsigned int local_sym_index)
1115{
1116 if (relobj->local_has_plt_offset(local_sym_index))
1117 return;
1118 if (this->plt_ == NULL)
1119 this->make_plt_section(symtab, layout);
1120 unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj,
1121 local_sym_index);
1122 relobj->set_local_plt_offset(local_sym_index, plt_offset);
1123}
1124
0e70b911
CC		 1125// Return the number of entries in the PLT.
1126
1127unsigned int
1128Target_i386::plt_entry_count() const
1129{
1130 if (this->plt_ == NULL)
1131 return 0;
1132 return this->plt_->entry_count();
1133}
1134
1135// Return the offset of the first non-reserved PLT entry.
1136
1137unsigned int
1138Target_i386::first_plt_entry_offset() const
1139{
1140 return Output_data_plt_i386::first_plt_entry_offset();
1141}
1142
1143// Return the size of each PLT entry.
1144
1145unsigned int
1146Target_i386::plt_entry_size() const
1147{
1148 return Output_data_plt_i386::get_plt_entry_size();
1149}
1150
e291e7b9
ILT		 1151// Get the section to use for TLS_DESC relocations.
1152
1153Target_i386::Reloc_section*
1154Target_i386::rel_tls_desc_section(Layout* layout) const
1155{
1156 return this->plt_section()->rel_tls_desc(layout);
1157}
1158
9fa33bee 1159// Define the _TLS_MODULE_BASE_ symbol in the TLS segment.
edfbb029
CC		 1160
1161void
1162Target_i386::define_tls_base_symbol(Symbol_table* symtab, Layout* layout)
1163{
1164 if (this->tls_base_symbol_defined_)
1165 return;
1166
1167 Output_segment* tls_segment = layout->tls_segment();
1168 if (tls_segment != NULL)
1169 {
183fd0e3 1170 bool is_exec = parameters->options().output_is_executable();
edfbb029 1171 symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL,
99fff23b 1172 Symbol_table::PREDEFINED,
edfbb029
CC		 1173 tls_segment, 0, 0,
1174 elfcpp::STT_TLS,
1175 elfcpp::STB_LOCAL,
1176 elfcpp::STV_HIDDEN, 0,
183fd0e3
AO		 1177 (is_exec
1178 ? Symbol::SEGMENT_END
1179 : Symbol::SEGMENT_START),
1180 true);
edfbb029
CC		 1181 }
1182 this->tls_base_symbol_defined_ = true;
1183}
1184
94c4710f
ILT		 1185// Create a GOT entry for the TLS module index.
1186
1187unsigned int
1188Target_i386::got_mod_index_entry(Symbol_table* symtab, Layout* layout,
6fa2a40b 1189 Sized_relobj_file<32, false>* object)
94c4710f
ILT		 1190{
1191 if (this->got_mod_index_offset_ == -1U)
1192 {
1193 gold_assert(symtab != NULL && layout != NULL && object != NULL);
1194 Reloc_section* rel_dyn = this->rel_dyn_section(layout);
1195 Output_data_got<32, false>* got = this->got_section(symtab, layout);
1196 unsigned int got_offset = got->add_constant(0);
1197 rel_dyn->add_local(object, 0, elfcpp::R_386_TLS_DTPMOD32, got,
1198 got_offset);
009a67a2 1199 got->add_constant(0);
94c4710f
ILT		 1200 this->got_mod_index_offset_ = got_offset;
1201 }
1202 return this->got_mod_index_offset_;
1203}
1204
92e059d8 1205// Optimize the TLS relocation type based on what we know about the
a3ad94ed
ILT		 1206// symbol. IS_FINAL is true if the final address of this symbol is
1207// known at link time.
92e059d8 1208
af6359d5 1209tls::Tls_optimization
7e1edb90 1210Target_i386::optimize_tls_reloc(bool is_final, int r_type)
92e059d8
ILT		 1211{
1212 // If we are generating a shared library, then we can't do anything
1213 // in the linker.
8851ecca 1214 if (parameters->options().shared())
af6359d5 1215 return tls::TLSOPT_NONE;
92e059d8
ILT		 1216
1217 switch (r_type)
1218 {
1219 case elfcpp::R_386_TLS_GD:
1220 case elfcpp::R_386_TLS_GOTDESC:
1221 case elfcpp::R_386_TLS_DESC_CALL:
e041f13d 1222 // These are General-Dynamic which permits fully general TLS
92e059d8
ILT		 1223 // access. Since we know that we are generating an executable,
1224 // we can convert this to Initial-Exec. If we also know that
1225 // this is a local symbol, we can further switch to Local-Exec.
a3ad94ed 1226 if (is_final)
af6359d5
ILT		 1227 return tls::TLSOPT_TO_LE;
1228 return tls::TLSOPT_TO_IE;
92e059d8
ILT		 1229
1230 case elfcpp::R_386_TLS_LDM:
1231 // This is Local-Dynamic, which refers to a local symbol in the
1232 // dynamic TLS block. Since we know that we generating an
1233 // executable, we can switch to Local-Exec.
af6359d5 1234 return tls::TLSOPT_TO_LE;
92e059d8
ILT		 1235
1236 case elfcpp::R_386_TLS_LDO_32:
af6359d5
ILT		 1237 // Another type of Local-Dynamic relocation.
1238 return tls::TLSOPT_TO_LE;
92e059d8
ILT		 1239
1240 case elfcpp::R_386_TLS_IE:
1241 case elfcpp::R_386_TLS_GOTIE:
1242 case elfcpp::R_386_TLS_IE_32:
1243 // These are Initial-Exec relocs which get the thread offset
1244 // from the GOT. If we know that we are linking against the
1245 // local symbol, we can switch to Local-Exec, which links the
1246 // thread offset into the instruction.
a3ad94ed 1247 if (is_final)
af6359d5
ILT		 1248 return tls::TLSOPT_TO_LE;
1249 return tls::TLSOPT_NONE;
8462ae85 1250
92e059d8
ILT		 1251 case elfcpp::R_386_TLS_LE:
1252 case elfcpp::R_386_TLS_LE_32:
1253 // When we already have Local-Exec, there is nothing further we
1254 // can do.
af6359d5 1255 return tls::TLSOPT_NONE;
92e059d8
ILT		 1256
1257 default:
a3ad94ed 1258 gold_unreachable();
92e059d8
ILT		 1259 }
1260}
1261
95a2c8d6 1262// Get the Reference_flags for a particular relocation.
af6359d5 1263
95a2c8d6
RS		 1264int
1265Target_i386::Scan::get_reference_flags(unsigned int r_type)
7223e9ca
ILT		 1266{
1267 switch (r_type)
1268 {
1269 case elfcpp::R_386_NONE:
1270 case elfcpp::R_386_GNU_VTINHERIT:
1271 case elfcpp::R_386_GNU_VTENTRY:
95a2c8d6
RS		 1272 case elfcpp::R_386_GOTPC:
1273 // No symbol reference.
1274 return 0;
7223e9ca
ILT		 1275
1276 case elfcpp::R_386_32:
1277 case elfcpp::R_386_16:
1278 case elfcpp::R_386_8:
95a2c8d6
RS		 1279 return Symbol::ABSOLUTE_REF;
1280
7223e9ca
ILT		 1281 case elfcpp::R_386_PC32:
1282 case elfcpp::R_386_PC16:
1283 case elfcpp::R_386_PC8:
7223e9ca 1284 case elfcpp::R_386_GOTOFF:
95a2c8d6
RS		 1285 return Symbol::RELATIVE_REF;
1286
1287 case elfcpp::R_386_PLT32:
1288 return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF;
1289
7223e9ca 1290 case elfcpp::R_386_GOT32:
95a2c8d6
RS		 1291 // Absolute in GOT.
1292 return Symbol::ABSOLUTE_REF;
1293
1294 case elfcpp::R_386_TLS_GD: // Global-dynamic
1295 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
1296 case elfcpp::R_386_TLS_DESC_CALL:
1297 case elfcpp::R_386_TLS_LDM: // Local-dynamic
1298 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
1299 case elfcpp::R_386_TLS_IE: // Initial-exec
1300 case elfcpp::R_386_TLS_IE_32:
1301 case elfcpp::R_386_TLS_GOTIE:
1302 case elfcpp::R_386_TLS_LE: // Local-exec
1303 case elfcpp::R_386_TLS_LE_32:
1304 return Symbol::TLS_REF;
7223e9ca
ILT		 1305
1306 case elfcpp::R_386_COPY:
1307 case elfcpp::R_386_GLOB_DAT:
1308 case elfcpp::R_386_JUMP_SLOT:
1309 case elfcpp::R_386_RELATIVE:
1310 case elfcpp::R_386_IRELATIVE:
1311 case elfcpp::R_386_TLS_TPOFF:
1312 case elfcpp::R_386_TLS_DTPMOD32:
1313 case elfcpp::R_386_TLS_DTPOFF32:
1314 case elfcpp::R_386_TLS_TPOFF32:
1315 case elfcpp::R_386_TLS_DESC:
7223e9ca
ILT		 1316 case elfcpp::R_386_32PLT:
1317 case elfcpp::R_386_TLS_GD_32:
1318 case elfcpp::R_386_TLS_GD_PUSH:
1319 case elfcpp::R_386_TLS_GD_CALL:
1320 case elfcpp::R_386_TLS_GD_POP:
1321 case elfcpp::R_386_TLS_LDM_32:
1322 case elfcpp::R_386_TLS_LDM_PUSH:
1323 case elfcpp::R_386_TLS_LDM_CALL:
1324 case elfcpp::R_386_TLS_LDM_POP:
1325 case elfcpp::R_386_USED_BY_INTEL_200:
1326 default:
95a2c8d6
RS		 1327 // Not expected. We will give an error later.
1328 return 0;
7223e9ca
ILT		 1329 }
1330}
1331
95a2c8d6
RS		 1332// Report an unsupported relocation against a local symbol.
1333
1334void
6fa2a40b 1335Target_i386::Scan::unsupported_reloc_local(Sized_relobj_file<32, false>* object,
95a2c8d6
RS		 1336 unsigned int r_type)
1337{
1338 gold_error(_("%s: unsupported reloc %u against local symbol"),
1339 object->name().c_str(), r_type);
1340}
1341
1342// Return whether we need to make a PLT entry for a relocation of a
1343// given type against a STT_GNU_IFUNC symbol.
1344
1345bool
6fa2a40b
CC		 1346Target_i386::Scan::reloc_needs_plt_for_ifunc(
1347 Sized_relobj_file<32, false>* object,
1348 unsigned int r_type)
95a2c8d6
RS		 1349{
1350 int flags = Scan::get_reference_flags(r_type);
1351 if (flags & Symbol::TLS_REF)
1352 gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"),
1353 object->name().c_str(), r_type);
1354 return flags != 0;
1355}
1356
92e059d8
ILT		 1357// Scan a relocation for a local symbol.
1358
1359inline void
ad0f2072 1360Target_i386::Scan::local(Symbol_table* symtab,
ead1e424
ILT		 1361 Layout* layout,
1362 Target_i386* target,
6fa2a40b 1363 Sized_relobj_file<32, false>* object,
1b64748b 1364 unsigned int data_shndx,
07f397ab 1365 Output_section* output_section,
1b64748b 1366 const elfcpp::Rel<32, false>& reloc,
a3ad94ed 1367 unsigned int r_type,
7bf1f802 1368 const elfcpp::Sym<32, false>& lsym)
92e059d8 1369{
7223e9ca
ILT		 1370 // A local STT_GNU_IFUNC symbol may require a PLT entry.
1371 if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC
1372 && this->reloc_needs_plt_for_ifunc(object, r_type))
1373 {
1374 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1375 target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym);
1376 }
1377
92e059d8
ILT		 1378 switch (r_type)
1379 {
1380 case elfcpp::R_386_NONE:
1381 case elfcpp::R_386_GNU_VTINHERIT:
1382 case elfcpp::R_386_GNU_VTENTRY:
1383 break;
1384
1385 case elfcpp::R_386_32:
436ca963
ILT		 1386 // If building a shared library (or a position-independent
1387 // executable), we need to create a dynamic relocation for
1388 // this location. The relocation applied at link time will
1389 // apply the link-time value, so we flag the location with
1390 // an R_386_RELATIVE relocation so the dynamic loader can
1391 // relocate it easily.
8851ecca 1392 if (parameters->options().output_is_position_independent())
436ca963
ILT		 1393 {
1394 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
e8c846c3 1395 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7223e9ca
ILT		 1396 rel_dyn->add_local_relative(object, r_sym, elfcpp::R_386_RELATIVE,
1397 output_section, data_shndx,
1398 reloc.get_r_offset());
d61c6bd4
ILT		 1399 }
1400 break;
1401
1402 case elfcpp::R_386_16:
1403 case elfcpp::R_386_8:
1404 // If building a shared library (or a position-independent
1405 // executable), we need to create a dynamic relocation for
1406 // this location. Because the addend needs to remain in the
1407 // data section, we need to be careful not to apply this
1408 // relocation statically.
8851ecca 1409 if (parameters->options().output_is_position_independent())
d61c6bd4
ILT		 1410 {
1411 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
d491d34e 1412 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
dceae3c1 1413 if (lsym.get_st_type() != elfcpp::STT_SECTION)
d491d34e
ILT		 1414 rel_dyn->add_local(object, r_sym, r_type, output_section,
1415 data_shndx, reloc.get_r_offset());
dceae3c1
ILT		 1416 else
1417 {
1418 gold_assert(lsym.get_st_value() == 0);
d491d34e
ILT		 1419 unsigned int shndx = lsym.get_st_shndx();
1420 bool is_ordinary;
1421 shndx = object->adjust_sym_shndx(r_sym, shndx,
1422 &is_ordinary);
1423 if (!is_ordinary)
1424 object->error(_("section symbol %u has bad shndx %u"),
1425 r_sym, shndx);
1426 else
1427 rel_dyn->add_local_section(object, shndx,
1428 r_type, output_section,
1429 data_shndx, reloc.get_r_offset());
dceae3c1 1430 }
436ca963 1431 }
92e059d8
ILT		 1432 break;
1433
1434 case elfcpp::R_386_PC32:
1435 case elfcpp::R_386_PC16:
1436 case elfcpp::R_386_PC8:
1437 break;
1438
df2efe71
ILT		 1439 case elfcpp::R_386_PLT32:
1440 // Since we know this is a local symbol, we can handle this as a
1441 // PC32 reloc.
1442 break;
1443
ead1e424
ILT		 1444 case elfcpp::R_386_GOTOFF:
1445 case elfcpp::R_386_GOTPC:
1446 // We need a GOT section.
7e1edb90 1447 target->got_section(symtab, layout);
ead1e424
ILT		 1448 break;
1449
1b64748b
ILT		 1450 case elfcpp::R_386_GOT32:
1451 {
1452 // The symbol requires a GOT entry.
1453 Output_data_got<32, false>* got = target->got_section(symtab, layout);
1454 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7223e9ca
ILT		 1455
1456 // For a STT_GNU_IFUNC symbol we want the PLT offset. That
1457 // lets function pointers compare correctly with shared
1458 // libraries. Otherwise we would need an IRELATIVE reloc.
1459 bool is_new;
1460 if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC)
1461 is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD);
1462 else
1463 is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD);
1464 if (is_new)
1b64748b
ILT		 1465 {
1466 // If we are generating a shared object, we need to add a
7bf1f802 1467 // dynamic RELATIVE relocation for this symbol's GOT entry.
8851ecca 1468 if (parameters->options().output_is_position_independent())
1b64748b
ILT		 1469 {
1470 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
7223e9ca
ILT		 1471 unsigned int got_offset =
1472 object->local_got_offset(r_sym, GOT_TYPE_STANDARD);
1473 rel_dyn->add_local_relative(object, r_sym,
1474 elfcpp::R_386_RELATIVE,
1475 got, got_offset);
1b64748b
ILT		 1476 }
1477 }
1478 }
1479 break;
1480
af6359d5
ILT		 1481 // These are relocations which should only be seen by the
1482 // dynamic linker, and should never be seen here.
92e059d8
ILT		 1483 case elfcpp::R_386_COPY:
1484 case elfcpp::R_386_GLOB_DAT:
1485 case elfcpp::R_386_JUMP_SLOT:
1486 case elfcpp::R_386_RELATIVE:
7223e9ca 1487 case elfcpp::R_386_IRELATIVE:
92e059d8
ILT		 1488 case elfcpp::R_386_TLS_TPOFF:
1489 case elfcpp::R_386_TLS_DTPMOD32:
1490 case elfcpp::R_386_TLS_DTPOFF32:
1491 case elfcpp::R_386_TLS_TPOFF32:
1492 case elfcpp::R_386_TLS_DESC:
a0c4fb0a 1493 gold_error(_("%s: unexpected reloc %u in object file"),
75f2446e 1494 object->name().c_str(), r_type);
92e059d8
ILT		 1495 break;
1496
af6359d5 1497 // These are initial TLS relocs, which are expected when
d61c17ea 1498 // linking.
56622147
ILT		 1499 case elfcpp::R_386_TLS_GD: // Global-dynamic
1500 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
1501 case elfcpp::R_386_TLS_DESC_CALL:
1502 case elfcpp::R_386_TLS_LDM: // Local-dynamic
1503 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
1504 case elfcpp::R_386_TLS_IE: // Initial-exec
92e059d8 1505 case elfcpp::R_386_TLS_IE_32:
56622147
ILT		 1506 case elfcpp::R_386_TLS_GOTIE:
1507 case elfcpp::R_386_TLS_LE: // Local-exec
92e059d8 1508 case elfcpp::R_386_TLS_LE_32:
7e1edb90 1509 {
8851ecca 1510 bool output_is_shared = parameters->options().shared();
af6359d5
ILT		 1511 const tls::Tls_optimization optimized_type
1512 = Target_i386::optimize_tls_reloc(!output_is_shared, r_type);
7e1edb90
ILT		 1513 switch (r_type)
1514 {
56622147 1515 case elfcpp::R_386_TLS_GD: // Global-dynamic
07f397ab
ILT		 1516 if (optimized_type == tls::TLSOPT_NONE)
1517 {
1518 // Create a pair of GOT entries for the module index and
1519 // dtv-relative offset.
1520 Output_data_got<32, false>* got
1521 = target->got_section(symtab, layout);
1522 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
d491d34e
ILT		 1523 unsigned int shndx = lsym.get_st_shndx();
1524 bool is_ordinary;
1525 shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary);
1526 if (!is_ordinary)
1527 object->error(_("local symbol %u has bad shndx %u"),
1528 r_sym, shndx);
1529 else
1530 got->add_local_pair_with_rel(object, r_sym, shndx,
1531 GOT_TYPE_TLS_PAIR,
1532 target->rel_dyn_section(layout),
1533 elfcpp::R_386_TLS_DTPMOD32, 0);
07f397ab
ILT		 1534 }
1535 else if (optimized_type != tls::TLSOPT_TO_LE)
1536 unsupported_reloc_local(object, r_type);
1537 break;
1538
56622147 1539 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva)
edfbb029 1540 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 1541 if (optimized_type == tls::TLSOPT_NONE)
1542 {
a8df5856
ILT		 1543 // Create a double GOT entry with an R_386_TLS_DESC
1544 // reloc. The R_386_TLS_DESC reloc is resolved
1545 // lazily, so the GOT entry needs to be in an area in
1546 // .got.plt, not .got. Call got_section to make sure
1547 // the section has been created.
1548 target->got_section(symtab, layout);
1549 Output_data_got<32, false>* got = target->got_tlsdesc_section();
c2b45e22 1550 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
e291e7b9
ILT		 1551 if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC))
1552 {
1553 unsigned int got_offset = got->add_constant(0);
1554 // The local symbol value is stored in the second
1555 // GOT entry.
1556 got->add_local(object, r_sym, GOT_TYPE_TLS_DESC);
1557 // That set the GOT offset of the local symbol to
1558 // point to the second entry, but we want it to
1559 // point to the first.
1560 object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC,
1561 got_offset);
1562 Reloc_section* rt = target->rel_tls_desc_section(layout);
1563 rt->add_absolute(elfcpp::R_386_TLS_DESC, got, got_offset);
1564 }
c2b45e22
CC		 1565 }
1566 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 1567 unsupported_reloc_local(object, r_type);
af6359d5
ILT		 1568 break;
1569
c2b45e22
CC		 1570 case elfcpp::R_386_TLS_DESC_CALL:
1571 break;
1572
56622147 1573 case elfcpp::R_386_TLS_LDM: // Local-dynamic
07f397ab
ILT		 1574 if (optimized_type == tls::TLSOPT_NONE)
1575 {
1576 // Create a GOT entry for the module index.
94c4710f 1577 target->got_mod_index_entry(symtab, layout, object);
07f397ab
ILT		 1578 }
1579 else if (optimized_type != tls::TLSOPT_TO_LE)
af6359d5
ILT		 1580 unsupported_reloc_local(object, r_type);
1581 break;
1582
56622147 1583 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
46cf9fa2
ILT		 1584 break;
1585
56622147
ILT		 1586 case elfcpp::R_386_TLS_IE: // Initial-exec
1587 case elfcpp::R_386_TLS_IE_32:
1588 case elfcpp::R_386_TLS_GOTIE:
535890bb 1589 layout->set_has_static_tls();
07f397ab
ILT		 1590 if (optimized_type == tls::TLSOPT_NONE)
1591 {
7bf1f802
ILT		 1592 // For the R_386_TLS_IE relocation, we need to create a
1593 // dynamic relocation when building a shared library.
1594 if (r_type == elfcpp::R_386_TLS_IE
8851ecca 1595 && parameters->options().shared())
7bf1f802
ILT		 1596 {
1597 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
e8c846c3
ILT		 1598 unsigned int r_sym
1599 = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1600 rel_dyn->add_local_relative(object, r_sym,
1601 elfcpp::R_386_RELATIVE,
1602 output_section, data_shndx,
1603 reloc.get_r_offset());
7bf1f802 1604 }
07f397ab
ILT		 1605 // Create a GOT entry for the tp-relative offset.
1606 Output_data_got<32, false>* got
1607 = target->got_section(symtab, layout);
1608 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
7bf1f802
ILT		 1609 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
1610 ? elfcpp::R_386_TLS_TPOFF32
1611 : elfcpp::R_386_TLS_TPOFF);
c2b45e22
CC		 1612 unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
1613 ? GOT_TYPE_TLS_OFFSET
1614 : GOT_TYPE_TLS_NOFFSET);
1615 got->add_local_with_rel(object, r_sym, got_type,
7bf1f802
ILT		 1616 target->rel_dyn_section(layout),
1617 dyn_r_type);
07f397ab
ILT		 1618 }
1619 else if (optimized_type != tls::TLSOPT_TO_LE)
af6359d5 1620 unsupported_reloc_local(object, r_type);
7e1edb90 1621 break;
af6359d5 1622
56622147
ILT		 1623 case elfcpp::R_386_TLS_LE: // Local-exec
1624 case elfcpp::R_386_TLS_LE_32:
535890bb 1625 layout->set_has_static_tls();
07f397ab 1626 if (output_is_shared)
7bf1f802
ILT		 1627 {
1628 // We need to create a dynamic relocation.
dceae3c1 1629 gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION);
7bf1f802
ILT		 1630 unsigned int r_sym = elfcpp::elf_r_sym<32>(reloc.get_r_info());
1631 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
1632 ? elfcpp::R_386_TLS_TPOFF32
1633 : elfcpp::R_386_TLS_TPOFF);
1634 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1635 rel_dyn->add_local(object, r_sym, dyn_r_type, output_section,
1636 data_shndx, reloc.get_r_offset());
1637 }
56622147
ILT		 1638 break;
1639
af6359d5
ILT		 1640 default:
1641 gold_unreachable();
7e1edb90
ILT		 1642 }
1643 }
92e059d8
ILT		 1644 break;
1645
92e059d8
ILT		 1646 case elfcpp::R_386_32PLT:
1647 case elfcpp::R_386_TLS_GD_32:
1648 case elfcpp::R_386_TLS_GD_PUSH:
1649 case elfcpp::R_386_TLS_GD_CALL:
1650 case elfcpp::R_386_TLS_GD_POP:
1651 case elfcpp::R_386_TLS_LDM_32:
1652 case elfcpp::R_386_TLS_LDM_PUSH:
1653 case elfcpp::R_386_TLS_LDM_CALL:
1654 case elfcpp::R_386_TLS_LDM_POP:
1655 case elfcpp::R_386_USED_BY_INTEL_200:
1656 default:
af6359d5 1657 unsupported_reloc_local(object, r_type);
92e059d8
ILT		 1658 break;
1659 }
1660}
1661
af6359d5
ILT		 1662// Report an unsupported relocation against a global symbol.
1663
1664void
6fa2a40b
CC		 1665Target_i386::Scan::unsupported_reloc_global(
1666 Sized_relobj_file<32, false>* object,
1667 unsigned int r_type,
1668 Symbol* gsym)
af6359d5 1669{
75f2446e 1670 gold_error(_("%s: unsupported reloc %u against global symbol %s"),
a2b1aa12 1671 object->name().c_str(), r_type, gsym->demangled_name().c_str());
af6359d5
ILT		 1672}
1673
0897ed3b
ST		 1674inline bool
1675Target_i386::Scan::possible_function_pointer_reloc(unsigned int r_type)
1676{
1677 switch (r_type)
1678 {
1679 case elfcpp::R_386_32:
1680 case elfcpp::R_386_16:
1681 case elfcpp::R_386_8:
1682 case elfcpp::R_386_GOTOFF:
1683 case elfcpp::R_386_GOT32:
1684 {
1685 return true;
1686 }
1687 default:
1688 return false;
1689 }
1690 return false;
1691}
1692
1693inline bool
1694Target_i386::Scan::local_reloc_may_be_function_pointer(
1695 Symbol_table* ,
1696 Layout* ,
1697 Target_i386* ,
6fa2a40b 1698 Sized_relobj_file<32, false>* ,
0897ed3b
ST		 1699 unsigned int ,
1700 Output_section* ,
1701 const elfcpp::Rel<32, false>& ,
1702 unsigned int r_type,
1703 const elfcpp::Sym<32, false>&)
1704{
1705 return possible_function_pointer_reloc(r_type);
1706}
1707
1708inline bool
1709Target_i386::Scan::global_reloc_may_be_function_pointer(
1710 Symbol_table* ,
1711 Layout* ,
1712 Target_i386* ,
6fa2a40b 1713 Sized_relobj_file<32, false>* ,
0897ed3b
ST		 1714 unsigned int ,
1715 Output_section* ,
1716 const elfcpp::Rel<32, false>& ,
1717 unsigned int r_type,
1718 Symbol*)
1719{
1720 return possible_function_pointer_reloc(r_type);
1721}
1722
92e059d8
ILT		 1723// Scan a relocation for a global symbol.
1724
1725inline void
ad0f2072 1726Target_i386::Scan::global(Symbol_table* symtab,
ead1e424
ILT		 1727 Layout* layout,
1728 Target_i386* target,
6fa2a40b 1729 Sized_relobj_file<32, false>* object,
a3ad94ed 1730 unsigned int data_shndx,
07f397ab 1731 Output_section* output_section,
a3ad94ed
ILT		 1732 const elfcpp::Rel<32, false>& reloc,
1733 unsigned int r_type,
92e059d8
ILT		 1734 Symbol* gsym)
1735{
7223e9ca
ILT		 1736 // A STT_GNU_IFUNC symbol may require a PLT entry.
1737 if (gsym->type() == elfcpp::STT_GNU_IFUNC
1738 && this->reloc_needs_plt_for_ifunc(object, r_type))
1739 target->make_plt_entry(symtab, layout, gsym);
1740
92e059d8
ILT		 1741 switch (r_type)
1742 {
1743 case elfcpp::R_386_NONE:
1744 case elfcpp::R_386_GNU_VTINHERIT:
8462ae85 1745 case elfcpp::R_386_GNU_VTENTRY:
92e059d8
ILT		 1746 break;
1747
1748 case elfcpp::R_386_32:
92e059d8 1749 case elfcpp::R_386_16:
92e059d8 1750 case elfcpp::R_386_8:
96f2030e 1751 {
d61c6bd4
ILT		 1752 // Make a PLT entry if necessary.
1753 if (gsym->needs_plt_entry())
1754 {
1755 target->make_plt_entry(symtab, layout, gsym);
1756 // Since this is not a PC-relative relocation, we may be
1757 // taking the address of a function. In that case we need to
1758 // set the entry in the dynamic symbol table to the address of
1759 // the PLT entry.
8851ecca 1760 if (gsym->is_from_dynobj() && !parameters->options().shared())
d61c6bd4
ILT		 1761 gsym->set_needs_dynsym_value();
1762 }
1763 // Make a dynamic relocation if necessary.
95a2c8d6 1764 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
d61c6bd4 1765 {
966d4097 1766 if (gsym->may_need_copy_reloc())
d61c6bd4 1767 {
12c0daef 1768 target->copy_reloc(symtab, layout, object,
4f4c5f80 1769 data_shndx, output_section, gsym, reloc);
d61c6bd4 1770 }
7223e9ca
ILT		 1771 else if (r_type == elfcpp::R_386_32
1772 && gsym->type() == elfcpp::STT_GNU_IFUNC
1773 && gsym->can_use_relative_reloc(false)
1774 && !gsym->is_from_dynobj()
1775 && !gsym->is_undefined()
1776 && !gsym->is_preemptible())
1777 {
1778 // Use an IRELATIVE reloc for a locally defined
1779 // STT_GNU_IFUNC symbol. This makes a function
1780 // address in a PIE executable match the address in a
1781 // shared library that it links against.
1782 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
1783 rel_dyn->add_symbolless_global_addend(gsym,
1784 elfcpp::R_386_IRELATIVE,
1785 output_section,
1786 object, data_shndx,
1787 reloc.get_r_offset());
1788 }
d61c6bd4
ILT		 1789 else if (r_type == elfcpp::R_386_32
1790 && gsym->can_use_relative_reloc(false))
1791 {
1792 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
7223e9ca
ILT		 1793 rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
1794 output_section, object,
1795 data_shndx, reloc.get_r_offset());
d61c6bd4
ILT		 1796 }
1797 else
1798 {
96f2030e 1799 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
4f4c5f80
ILT		 1800 rel_dyn->add_global(gsym, r_type, output_section, object,
1801 data_shndx, reloc.get_r_offset());
d61c6bd4
ILT		 1802 }
1803 }
1804 }
1805 break;
1806
1807 case elfcpp::R_386_PC32:
1808 case elfcpp::R_386_PC16:
1809 case elfcpp::R_386_PC8:
1810 {
1811 // Make a PLT entry if necessary.
1812 if (gsym->needs_plt_entry())
7bf1f802
ILT		 1813 {
1814 // These relocations are used for function calls only in
1815 // non-PIC code. For a 32-bit relocation in a shared library,
1816 // we'll need a text relocation anyway, so we can skip the
1817 // PLT entry and let the dynamic linker bind the call directly
1818 // to the target. For smaller relocations, we should use a
1819 // PLT entry to ensure that the call can reach.
8851ecca 1820 if (!parameters->options().shared()
7bf1f802
ILT		 1821 || r_type != elfcpp::R_386_PC32)
1822 target->make_plt_entry(symtab, layout, gsym);
1823 }
d61c6bd4 1824 // Make a dynamic relocation if necessary.
95a2c8d6 1825 if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type)))
96f2030e 1826 {
966d4097 1827 if (gsym->may_need_copy_reloc())
d61c6bd4 1828 {
12c0daef 1829 target->copy_reloc(symtab, layout, object,
4f4c5f80 1830 data_shndx, output_section, gsym, reloc);
d61c6bd4 1831 }
86849f1f 1832 else
d61c6bd4
ILT		 1833 {
1834 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
4f4c5f80
ILT		 1835 rel_dyn->add_global(gsym, r_type, output_section, object,
1836 data_shndx, reloc.get_r_offset());
d61c6bd4 1837 }
96f2030e
ILT		 1838 }
1839 }
92e059d8
ILT		 1840 break;
1841
ead1e424 1842 case elfcpp::R_386_GOT32:
8462ae85
ILT		 1843 {
1844 // The symbol requires a GOT entry.
7e1edb90 1845 Output_data_got<32, false>* got = target->got_section(symtab, layout);
7bf1f802 1846 if (gsym->final_value_is_known())
7223e9ca
ILT		 1847 {
1848 // For a STT_GNU_IFUNC symbol we want the PLT address.
1849 if (gsym->type() == elfcpp::STT_GNU_IFUNC)
1850 got->add_global_plt(gsym, GOT_TYPE_STANDARD);
1851 else
1852 got->add_global(gsym, GOT_TYPE_STANDARD);
1853 }
7bf1f802
ILT		 1854 else
1855 {
8462ae85 1856 // If this symbol is not fully resolved, we need to add a
7bf1f802
ILT		 1857 // GOT entry with a dynamic relocation.
1858 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
8fc19601
ILT		 1859 if (gsym->is_from_dynobj()
1860 || gsym->is_undefined()
7223e9ca
ILT		 1861 || gsym->is_preemptible()
1862 || (gsym->type() == elfcpp::STT_GNU_IFUNC
1863 && parameters->options().output_is_position_independent()))
0a65a3a7
CC		 1864 got->add_global_with_rel(gsym, GOT_TYPE_STANDARD,
1865 rel_dyn, elfcpp::R_386_GLOB_DAT);
7bf1f802 1866 else
8462ae85 1867 {
7223e9ca
ILT		 1868 // For a STT_GNU_IFUNC symbol we want to write the PLT
1869 // offset into the GOT, so that function pointer
1870 // comparisons work correctly.
1871 bool is_new;
1872 if (gsym->type() != elfcpp::STT_GNU_IFUNC)
1873 is_new = got->add_global(gsym, GOT_TYPE_STANDARD);
1874 else
1875 {
1876 is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD);
1877 // Tell the dynamic linker to use the PLT address
1878 // when resolving relocations.
1879 if (gsym->is_from_dynobj()
1880 && !parameters->options().shared())
1881 gsym->set_needs_dynsym_value();
1882 }
1883 if (is_new)
1884 {
1885 unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD);
1886 rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
1887 got, got_off);
1888 }
8462ae85
ILT		 1889 }
1890 }
1891 }
ead1e424
ILT		 1892 break;
1893
1894 case elfcpp::R_386_PLT32:
a3ad94ed
ILT		 1895 // If the symbol is fully resolved, this is just a PC32 reloc.
1896 // Otherwise we need a PLT entry.
7e1edb90 1897 if (gsym->final_value_is_known())
ead1e424 1898 break;
436ca963
ILT		 1899 // If building a shared library, we can also skip the PLT entry
1900 // if the symbol is defined in the output file and is protected
1901 // or hidden.
1902 if (gsym->is_defined()
1903 && !gsym->is_from_dynobj()
1904 && !gsym->is_preemptible())
1905 break;
7e1edb90 1906 target->make_plt_entry(symtab, layout, gsym);
ead1e424
ILT		 1907 break;
1908
1909 case elfcpp::R_386_GOTOFF:
1910 case elfcpp::R_386_GOTPC:
1911 // We need a GOT section.
7e1edb90 1912 target->got_section(symtab, layout);
ead1e424
ILT		 1913 break;
1914
af6359d5
ILT		 1915 // These are relocations which should only be seen by the
1916 // dynamic linker, and should never be seen here.
92e059d8
ILT		 1917 case elfcpp::R_386_COPY:
1918 case elfcpp::R_386_GLOB_DAT:
1919 case elfcpp::R_386_JUMP_SLOT:
1920 case elfcpp::R_386_RELATIVE:
7223e9ca 1921 case elfcpp::R_386_IRELATIVE:
92e059d8
ILT		 1922 case elfcpp::R_386_TLS_TPOFF:
1923 case elfcpp::R_386_TLS_DTPMOD32:
1924 case elfcpp::R_386_TLS_DTPOFF32:
1925 case elfcpp::R_386_TLS_TPOFF32:
1926 case elfcpp::R_386_TLS_DESC:
75f2446e
ILT		 1927 gold_error(_("%s: unexpected reloc %u in object file"),
1928 object->name().c_str(), r_type);
92e059d8
ILT		 1929 break;
1930
d61c17ea
ILT		 1931 // These are initial tls relocs, which are expected when
1932 // linking.
56622147
ILT		 1933 case elfcpp::R_386_TLS_GD: // Global-dynamic
1934 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
1935 case elfcpp::R_386_TLS_DESC_CALL:
1936 case elfcpp::R_386_TLS_LDM: // Local-dynamic
1937 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
1938 case elfcpp::R_386_TLS_IE: // Initial-exec
92e059d8 1939 case elfcpp::R_386_TLS_IE_32:
56622147
ILT		 1940 case elfcpp::R_386_TLS_GOTIE:
1941 case elfcpp::R_386_TLS_LE: // Local-exec
92e059d8 1942 case elfcpp::R_386_TLS_LE_32:
a3ad94ed 1943 {
7e1edb90 1944 const bool is_final = gsym->final_value_is_known();
af6359d5
ILT		 1945 const tls::Tls_optimization optimized_type
1946 = Target_i386::optimize_tls_reloc(is_final, r_type);
a3ad94ed
ILT		 1947 switch (r_type)
1948 {
56622147 1949 case elfcpp::R_386_TLS_GD: // Global-dynamic
07f397ab
ILT		 1950 if (optimized_type == tls::TLSOPT_NONE)
1951 {
1952 // Create a pair of GOT entries for the module index and
1953 // dtv-relative offset.
1954 Output_data_got<32, false>* got
1955 = target->got_section(symtab, layout);
0a65a3a7 1956 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR,
7bf1f802
ILT		 1957 target->rel_dyn_section(layout),
1958 elfcpp::R_386_TLS_DTPMOD32,
1959 elfcpp::R_386_TLS_DTPOFF32);
07f397ab
ILT		 1960 }
1961 else if (optimized_type == tls::TLSOPT_TO_IE)
1962 {
1963 // Create a GOT entry for the tp-relative offset.
1964 Output_data_got<32, false>* got
1965 = target->got_section(symtab, layout);
c2b45e22 1966 got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
0a65a3a7 1967 target->rel_dyn_section(layout),
c2b45e22 1968 elfcpp::R_386_TLS_TPOFF);
07f397ab
ILT		 1969 }
1970 else if (optimized_type != tls::TLSOPT_TO_LE)
1971 unsupported_reloc_global(object, r_type, gsym);
1972 break;
1973
56622147 1974 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (~oliva url)
edfbb029 1975 target->define_tls_base_symbol(symtab, layout);
c2b45e22
CC		 1976 if (optimized_type == tls::TLSOPT_NONE)
1977 {
a8df5856
ILT		 1978 // Create a double GOT entry with an R_386_TLS_DESC
1979 // reloc. The R_386_TLS_DESC reloc is resolved
1980 // lazily, so the GOT entry needs to be in an area in
1981 // .got.plt, not .got. Call got_section to make sure
1982 // the section has been created.
1983 target->got_section(symtab, layout);
1984 Output_data_got<32, false>* got = target->got_tlsdesc_section();
e291e7b9
ILT		 1985 Reloc_section* rt = target->rel_tls_desc_section(layout);
1986 got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt,
c2b45e22
CC		 1987 elfcpp::R_386_TLS_DESC, 0);
1988 }
1989 else if (optimized_type == tls::TLSOPT_TO_IE)
1990 {
1991 // Create a GOT entry for the tp-relative offset.
1992 Output_data_got<32, false>* got
1993 = target->got_section(symtab, layout);
1994 got->add_global_with_rel(gsym, GOT_TYPE_TLS_NOFFSET,
1995 target->rel_dyn_section(layout),
1996 elfcpp::R_386_TLS_TPOFF);
1997 }
1998 else if (optimized_type != tls::TLSOPT_TO_LE)
7bf1f802 1999 unsupported_reloc_global(object, r_type, gsym);
c2b45e22
CC		 2000 break;
2001
2002 case elfcpp::R_386_TLS_DESC_CALL:
af6359d5
ILT		 2003 break;
2004
56622147 2005 case elfcpp::R_386_TLS_LDM: // Local-dynamic
07f397ab
ILT		 2006 if (optimized_type == tls::TLSOPT_NONE)
2007 {
2008 // Create a GOT entry for the module index.
94c4710f 2009 target->got_mod_index_entry(symtab, layout, object);
07f397ab
ILT		 2010 }
2011 else if (optimized_type != tls::TLSOPT_TO_LE)
af6359d5
ILT		 2012 unsupported_reloc_global(object, r_type, gsym);
2013 break;
2014
56622147 2015 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
46cf9fa2
ILT		 2016 break;
2017
56622147
ILT		 2018 case elfcpp::R_386_TLS_IE: // Initial-exec
2019 case elfcpp::R_386_TLS_IE_32:
2020 case elfcpp::R_386_TLS_GOTIE:
535890bb 2021 layout->set_has_static_tls();
07f397ab
ILT		 2022 if (optimized_type == tls::TLSOPT_NONE)
2023 {
7bf1f802
ILT		 2024 // For the R_386_TLS_IE relocation, we need to create a
2025 // dynamic relocation when building a shared library.
2026 if (r_type == elfcpp::R_386_TLS_IE
8851ecca 2027 && parameters->options().shared())
07f397ab 2028 {
07f397ab 2029 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
e8c846c3
ILT		 2030 rel_dyn->add_global_relative(gsym, elfcpp::R_386_RELATIVE,
2031 output_section, object,
2032 data_shndx,
2033 reloc.get_r_offset());
07f397ab 2034 }
7bf1f802
ILT		 2035 // Create a GOT entry for the tp-relative offset.
2036 Output_data_got<32, false>* got
2037 = target->got_section(symtab, layout);
2038 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_IE_32
2039 ? elfcpp::R_386_TLS_TPOFF32
2040 : elfcpp::R_386_TLS_TPOFF);
c2b45e22
CC		 2041 unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
2042 ? GOT_TYPE_TLS_OFFSET
2043 : GOT_TYPE_TLS_NOFFSET);
2044 got->add_global_with_rel(gsym, got_type,
7bf1f802
ILT		 2045 target->rel_dyn_section(layout),
2046 dyn_r_type);
07f397ab
ILT		 2047 }
2048 else if (optimized_type != tls::TLSOPT_TO_LE)
af6359d5 2049 unsupported_reloc_global(object, r_type, gsym);
a3ad94ed 2050 break;
af6359d5 2051
56622147
ILT		 2052 case elfcpp::R_386_TLS_LE: // Local-exec
2053 case elfcpp::R_386_TLS_LE_32:
535890bb 2054 layout->set_has_static_tls();
8851ecca 2055 if (parameters->options().shared())
7bf1f802
ILT		 2056 {
2057 // We need to create a dynamic relocation.
2058 unsigned int dyn_r_type = (r_type == elfcpp::R_386_TLS_LE_32
2059 ? elfcpp::R_386_TLS_TPOFF32
2060 : elfcpp::R_386_TLS_TPOFF);
2061 Reloc_section* rel_dyn = target->rel_dyn_section(layout);
2062 rel_dyn->add_global(gsym, dyn_r_type, output_section, object,
2063 data_shndx, reloc.get_r_offset());
2064 }
56622147
ILT		 2065 break;
2066
af6359d5
ILT		 2067 default:
2068 gold_unreachable();
a3ad94ed
ILT		 2069 }
2070 }
92e059d8
ILT		 2071 break;
2072
92e059d8
ILT		 2073 case elfcpp::R_386_32PLT:
2074 case elfcpp::R_386_TLS_GD_32:
2075 case elfcpp::R_386_TLS_GD_PUSH:
2076 case elfcpp::R_386_TLS_GD_CALL:
2077 case elfcpp::R_386_TLS_GD_POP:
2078 case elfcpp::R_386_TLS_LDM_32:
2079 case elfcpp::R_386_TLS_LDM_PUSH:
2080 case elfcpp::R_386_TLS_LDM_CALL:
2081 case elfcpp::R_386_TLS_LDM_POP:
2082 case elfcpp::R_386_USED_BY_INTEL_200:
2083 default:
af6359d5 2084 unsupported_reloc_global(object, r_type, gsym);
92e059d8
ILT		 2085 break;
2086 }
2087}
2088
6d03d481
ST		 2089// Process relocations for gc.
2090
2091void
ad0f2072 2092Target_i386::gc_process_relocs(Symbol_table* symtab,
6d03d481 2093 Layout* layout,
6fa2a40b 2094 Sized_relobj_file<32, false>* object,
6d03d481
ST		 2095 unsigned int data_shndx,
2096 unsigned int,
2097 const unsigned char* prelocs,
2098 size_t reloc_count,
2099 Output_section* output_section,
2100 bool needs_special_offset_handling,
2101 size_t local_symbol_count,
2102 const unsigned char* plocal_symbols)
2103{
2104 gold::gc_process_relocs<32, false, Target_i386, elfcpp::SHT_REL,
41cbeecc
ST		 2105 Target_i386::Scan,
2106 Target_i386::Relocatable_size_for_reloc>(
6d03d481
ST		 2107 symtab,
2108 layout,
2109 this,
2110 object,
2111 data_shndx,
2112 prelocs,
2113 reloc_count,
2114 output_section,
2115 needs_special_offset_handling,
2116 local_symbol_count,
2117 plocal_symbols);
2118}
2119
92e059d8
ILT		 2120// Scan relocations for a section.
2121
2122void
ad0f2072 2123Target_i386::scan_relocs(Symbol_table* symtab,
ead1e424 2124 Layout* layout,
6fa2a40b 2125 Sized_relobj_file<32, false>* object,
a3ad94ed 2126 unsigned int data_shndx,
92e059d8
ILT		 2127 unsigned int sh_type,
2128 const unsigned char* prelocs,
2129 size_t reloc_count,
730cdc88
ILT		 2130 Output_section* output_section,
2131 bool needs_special_offset_handling,
92e059d8 2132 size_t local_symbol_count,
730cdc88 2133 const unsigned char* plocal_symbols)
92e059d8
ILT		 2134{
2135 if (sh_type == elfcpp::SHT_RELA)
2136 {
75f2446e
ILT		 2137 gold_error(_("%s: unsupported RELA reloc section"),
2138 object->name().c_str());
2139 return;
92e059d8
ILT		 2140 }
2141
ead1e424
ILT		 2142 gold::scan_relocs<32, false, Target_i386, elfcpp::SHT_REL,
2143 Target_i386::Scan>(
92e059d8 2144 symtab,
ead1e424
ILT		 2145 layout,
2146 this,
92e059d8 2147 object,
a3ad94ed 2148 data_shndx,
92e059d8
ILT		 2149 prelocs,
2150 reloc_count,
730cdc88
ILT		 2151 output_section,
2152 needs_special_offset_handling,
92e059d8 2153 local_symbol_count,
730cdc88 2154 plocal_symbols);
92e059d8
ILT		 2155}
2156
16649710 2157// Finalize the sections.
5a6f7e2d
ILT		 2158
2159void
f59f41f3
DK		 2160Target_i386::do_finalize_sections(
2161 Layout* layout,
2162 const Input_objects*,
e785ec03 2163 Symbol_table* symtab)
5a6f7e2d 2164{
ea715a34
ILT		 2165 const Reloc_section* rel_plt = (this->plt_ == NULL
2166 ? NULL
2167 : this->plt_->rel_plt());
2168 layout->add_target_dynamic_tags(true, this->got_plt_, rel_plt,
612a8d3d 2169 this->rel_dyn_, true, false);
16649710
ILT		 2170
2171 // Emit any relocs we saved in an attempt to avoid generating COPY
2172 // relocs.
12c0daef
ILT		 2173 if (this->copy_relocs_.any_saved_relocs())
2174 this->copy_relocs_.emit(this->rel_dyn_section(layout));
e785ec03
ILT		 2175
2176 // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of
2177 // the .got.plt section.
2178 Symbol* sym = this->global_offset_table_;
2179 if (sym != NULL)
2180 {
2181 uint32_t data_size = this->got_plt_->current_data_size();
2182 symtab->get_sized_symbol<32>(sym)->set_symsize(data_size);
2183 }
5a6f7e2d
ILT		 2184}
2185
86849f1f
ILT		 2186// Return whether a direct absolute static relocation needs to be applied.
2187// In cases where Scan::local() or Scan::global() has created
2188// a dynamic relocation other than R_386_RELATIVE, the addend
2189// of the relocation is carried in the data, and we must not
2190// apply the static relocation.
2191
2192inline bool
2193Target_i386::Relocate::should_apply_static_reloc(const Sized_symbol<32>* gsym,
95a2c8d6 2194 unsigned int r_type,
031cdbed
ILT		 2195 bool is_32bit,
2196 Output_section* output_section)
86849f1f 2197{
031cdbed
ILT		 2198 // If the output section is not allocated, then we didn't call
2199 // scan_relocs, we didn't create a dynamic reloc, and we must apply
2200 // the reloc here.
2201 if ((output_section->flags() & elfcpp::SHF_ALLOC) == 0)
2202 return true;
2203
95a2c8d6
RS		 2204 int ref_flags = Scan::get_reference_flags(r_type);
2205
d61c6bd4
ILT		 2206 // For local symbols, we will have created a non-RELATIVE dynamic
2207 // relocation only if (a) the output is position independent,
2208 // (b) the relocation is absolute (not pc- or segment-relative), and
2209 // (c) the relocation is not 32 bits wide.
86849f1f 2210 if (gsym == NULL)
8851ecca 2211 return !(parameters->options().output_is_position_independent()
0700cf32 2212 && (ref_flags & Symbol::ABSOLUTE_REF)
d61c6bd4 2213 && !is_32bit);
86849f1f 2214
0700cf32
ILT		 2215 // For global symbols, we use the same helper routines used in the
2216 // scan pass. If we did not create a dynamic relocation, or if we
2217 // created a RELATIVE dynamic relocation, we should apply the static
2218 // relocation.
2219 bool has_dyn = gsym->needs_dynamic_reloc(ref_flags);
2220 bool is_rel = (ref_flags & Symbol::ABSOLUTE_REF)
2221 && gsym->can_use_relative_reloc(ref_flags
2222 & Symbol::FUNCTION_CALL);
2223 return !has_dyn || is_rel;
86849f1f
ILT		 2224}
2225
61ba1cf9
ILT		 2226// Perform a relocation.
2227
ead1e424 2228inline bool
92e059d8 2229Target_i386::Relocate::relocate(const Relocate_info<32, false>* relinfo,
ead1e424 2230 Target_i386* target,
ca09d69a 2231 Output_section* output_section,
92e059d8
ILT		 2232 size_t relnum,
2233 const elfcpp::Rel<32, false>& rel,
2234 unsigned int r_type,
c06b7b0b 2235 const Sized_symbol<32>* gsym,
b8e6aad9 2236 const Symbol_value<32>* psymval,
92e059d8
ILT		 2237 unsigned char* view,
2238 elfcpp::Elf_types<32>::Elf_Addr address,
fe8718a4 2239 section_size_type view_size)
61ba1cf9 2240{
ead1e424
ILT		 2241 if (this->skip_call_tls_get_addr_)
2242 {
5efc7cd2
CC		 2243 if ((r_type != elfcpp::R_386_PLT32
2244 && r_type != elfcpp::R_386_PC32)
ead1e424
ILT		 2245 || gsym == NULL
2246 || strcmp(gsym->name(), "___tls_get_addr") != 0)
75f2446e
ILT		 2247 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2248 _("missing expected TLS relocation"));
2249 else
ead1e424 2250 {
75f2446e
ILT		 2251 this->skip_call_tls_get_addr_ = false;
2252 return false;
ead1e424 2253 }
ead1e424
ILT		 2254 }
2255
6fa2a40b 2256 const Sized_relobj_file<32, false>* object = relinfo->object;
7223e9ca 2257
a3ad94ed 2258 // Pick the value to use for symbols defined in shared objects.
b8e6aad9 2259 Symbol_value<32> symval;
436ca963 2260 if (gsym != NULL
7223e9ca
ILT		 2261 && gsym->type() == elfcpp::STT_GNU_IFUNC
2262 && r_type == elfcpp::R_386_32
95a2c8d6 2263 && gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))
7223e9ca
ILT		 2264 && gsym->can_use_relative_reloc(false)
2265 && !gsym->is_from_dynobj()
2266 && !gsym->is_undefined()
2267 && !gsym->is_preemptible())
2268 {
2269 // In this case we are generating a R_386_IRELATIVE reloc. We
2270 // want to use the real value of the symbol, not the PLT offset.
2271 }
2272 else if (gsym != NULL
95a2c8d6 2273 && gsym->use_plt_offset(Scan::get_reference_flags(r_type)))
a3ad94ed 2274 {
b8e6aad9
ILT		 2275 symval.set_output_value(target->plt_section()->address()
2276 + gsym->plt_offset());
2277 psymval = &symval;
a3ad94ed 2278 }
7223e9ca
ILT		 2279 else if (gsym == NULL && psymval->is_ifunc_symbol())
2280 {
2281 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
2282 if (object->local_has_plt_offset(r_sym))
2283 {
2284 symval.set_output_value(target->plt_section()->address()
2285 + object->local_plt_offset(r_sym));
2286 psymval = &symval;
2287 }
2288 }
b8e6aad9 2289
1b64748b 2290 // Get the GOT offset if needed.
96f2030e
ILT		 2291 // The GOT pointer points to the end of the GOT section.
2292 // We need to subtract the size of the GOT section to get
2293 // the actual offset to use in the relocation.
1b64748b
ILT		 2294 bool have_got_offset = false;
2295 unsigned int got_offset = 0;
2296 switch (r_type)
2297 {
2298 case elfcpp::R_386_GOT32:
2299 if (gsym != NULL)
2300 {
0a65a3a7
CC		 2301 gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD));
2302 got_offset = (gsym->got_offset(GOT_TYPE_STANDARD)
2303 - target->got_size());
1b64748b
ILT		 2304 }
2305 else
2306 {
2307 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
0a65a3a7
CC		 2308 gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD));
2309 got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD)
2310 - target->got_size());
1b64748b
ILT		 2311 }
2312 have_got_offset = true;
2313 break;
2314
2315 default:
2316 break;
2317 }
2318
61ba1cf9
ILT		 2319 switch (r_type)
2320 {
2321 case elfcpp::R_386_NONE:
92e059d8
ILT		 2322 case elfcpp::R_386_GNU_VTINHERIT:
2323 case elfcpp::R_386_GNU_VTENTRY:
61ba1cf9
ILT		 2324 break;
2325
2326 case elfcpp::R_386_32:
95a2c8d6 2327 if (should_apply_static_reloc(gsym, r_type, true, output_section))
86849f1f 2328 Relocate_functions<32, false>::rel32(view, object, psymval);
61ba1cf9
ILT		 2329 break;
2330
2331 case elfcpp::R_386_PC32:
95a2c8d6
RS		 2332 if (should_apply_static_reloc(gsym, r_type, true, output_section))
2333 Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
92e059d8
ILT		 2334 break;
2335
2336 case elfcpp::R_386_16:
95a2c8d6 2337 if (should_apply_static_reloc(gsym, r_type, false, output_section))
86849f1f 2338 Relocate_functions<32, false>::rel16(view, object, psymval);
92e059d8
ILT		 2339 break;
2340
2341 case elfcpp::R_386_PC16:
95a2c8d6
RS		 2342 if (should_apply_static_reloc(gsym, r_type, false, output_section))
2343 Relocate_functions<32, false>::pcrel16(view, object, psymval, address);
61ba1cf9
ILT		 2344 break;
2345
92e059d8 2346 case elfcpp::R_386_8:
95a2c8d6 2347 if (should_apply_static_reloc(gsym, r_type, false, output_section))
86849f1f 2348 Relocate_functions<32, false>::rel8(view, object, psymval);
92e059d8
ILT		 2349 break;
2350
2351 case elfcpp::R_386_PC8:
95a2c8d6
RS		 2352 if (should_apply_static_reloc(gsym, r_type, false, output_section))
2353 Relocate_functions<32, false>::pcrel8(view, object, psymval, address);
92e059d8
ILT		 2354 break;
2355
ead1e424 2356 case elfcpp::R_386_PLT32:
df2efe71
ILT		 2357 gold_assert(gsym == NULL
2358 || gsym->has_plt_offset()
99f8faca
ILT		 2359 || gsym->final_value_is_known()
2360 || (gsym->is_defined()
2361 && !gsym->is_from_dynobj()
2362 && !gsym->is_preemptible()));
b8e6aad9 2363 Relocate_functions<32, false>::pcrel32(view, object, psymval, address);
ead1e424
ILT		 2364 break;
2365
2366 case elfcpp::R_386_GOT32:
1b64748b
ILT		 2367 gold_assert(have_got_offset);
2368 Relocate_functions<32, false>::rel32(view, got_offset);
ead1e424
ILT		 2369 break;
2370
2371 case elfcpp::R_386_GOTOFF:
b8e6aad9
ILT		 2372 {
2373 elfcpp::Elf_types<32>::Elf_Addr value;
2374 value = (psymval->value(object, 0)
96f2030e 2375 - target->got_plt_section()->address());
b8e6aad9
ILT		 2376 Relocate_functions<32, false>::rel32(view, value);
2377 }
ead1e424
ILT		 2378 break;
2379
2380 case elfcpp::R_386_GOTPC:
b8e6aad9
ILT		 2381 {
2382 elfcpp::Elf_types<32>::Elf_Addr value;
96f2030e 2383 value = target->got_plt_section()->address();
b8e6aad9
ILT		 2384 Relocate_functions<32, false>::pcrel32(view, value, address);
2385 }
ead1e424
ILT		 2386 break;
2387
92e059d8
ILT		 2388 case elfcpp::R_386_COPY:
2389 case elfcpp::R_386_GLOB_DAT:
2390 case elfcpp::R_386_JUMP_SLOT:
2391 case elfcpp::R_386_RELATIVE:
7223e9ca 2392 case elfcpp::R_386_IRELATIVE:
d61c17ea
ILT		 2393 // These are outstanding tls relocs, which are unexpected when
2394 // linking.
92e059d8
ILT		 2395 case elfcpp::R_386_TLS_TPOFF:
2396 case elfcpp::R_386_TLS_DTPMOD32:
2397 case elfcpp::R_386_TLS_DTPOFF32:
2398 case elfcpp::R_386_TLS_TPOFF32:
2399 case elfcpp::R_386_TLS_DESC:
75f2446e
ILT		 2400 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2401 _("unexpected reloc %u in object file"),
2402 r_type);
92e059d8
ILT		 2403 break;
2404
d61c17ea
ILT		 2405 // These are initial tls relocs, which are expected when
2406 // linking.
56622147
ILT		 2407 case elfcpp::R_386_TLS_GD: // Global-dynamic
2408 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
2409 case elfcpp::R_386_TLS_DESC_CALL:
2410 case elfcpp::R_386_TLS_LDM: // Local-dynamic
2411 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
2412 case elfcpp::R_386_TLS_IE: // Initial-exec
92e059d8 2413 case elfcpp::R_386_TLS_IE_32:
56622147
ILT		 2414 case elfcpp::R_386_TLS_GOTIE:
2415 case elfcpp::R_386_TLS_LE: // Local-exec
92e059d8 2416 case elfcpp::R_386_TLS_LE_32:
07f397ab
ILT		 2417 this->relocate_tls(relinfo, target, relnum, rel, r_type, gsym, psymval,
2418 view, address, view_size);
92e059d8
ILT		 2419 break;
2420
92e059d8
ILT		 2421 case elfcpp::R_386_32PLT:
2422 case elfcpp::R_386_TLS_GD_32:
2423 case elfcpp::R_386_TLS_GD_PUSH:
2424 case elfcpp::R_386_TLS_GD_CALL:
2425 case elfcpp::R_386_TLS_GD_POP:
2426 case elfcpp::R_386_TLS_LDM_32:
2427 case elfcpp::R_386_TLS_LDM_PUSH:
2428 case elfcpp::R_386_TLS_LDM_CALL:
2429 case elfcpp::R_386_TLS_LDM_POP:
2430 case elfcpp::R_386_USED_BY_INTEL_200:
61ba1cf9 2431 default:
75f2446e
ILT		 2432 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2433 _("unsupported reloc %u"),
2434 r_type);
92e059d8
ILT		 2435 break;
2436 }
ead1e424
ILT		 2437
2438 return true;
92e059d8
ILT		 2439}
2440
2441// Perform a TLS relocation.
2442
2443inline void
2444Target_i386::Relocate::relocate_tls(const Relocate_info<32, false>* relinfo,
07f397ab 2445 Target_i386* target,
92e059d8
ILT		 2446 size_t relnum,
2447 const elfcpp::Rel<32, false>& rel,
2448 unsigned int r_type,
c06b7b0b 2449 const Sized_symbol<32>* gsym,
b8e6aad9 2450 const Symbol_value<32>* psymval,
92e059d8
ILT		 2451 unsigned char* view,
2452 elfcpp::Elf_types<32>::Elf_Addr,
fe8718a4 2453 section_size_type view_size)
92e059d8
ILT		 2454{
2455 Output_segment* tls_segment = relinfo->layout->tls_segment();
92e059d8 2456
6fa2a40b 2457 const Sized_relobj_file<32, false>* object = relinfo->object;
07f397ab
ILT		 2458
2459 elfcpp::Elf_types<32>::Elf_Addr value = psymval->value(object, 0);
b8e6aad9 2460
b3705d2a
ILT		 2461 const bool is_final = (gsym == NULL
2462 ? !parameters->options().shared()
2463 : gsym->final_value_is_known());
af6359d5
ILT		 2464 const tls::Tls_optimization optimized_type
2465 = Target_i386::optimize_tls_reloc(is_final, r_type);
92e059d8
ILT		 2466 switch (r_type)
2467 {
56622147 2468 case elfcpp::R_386_TLS_GD: // Global-dynamic
af6359d5 2469 if (optimized_type == tls::TLSOPT_TO_LE)
92e059d8 2470 {
07f397ab 2471 gold_assert(tls_segment != NULL);
56622147
ILT		 2472 this->tls_gd_to_le(relinfo, relnum, tls_segment,
2473 rel, r_type, value, view,
2474 view_size);
92e059d8
ILT		 2475 break;
2476 }
07f397ab
ILT		 2477 else
2478 {
c2b45e22
CC		 2479 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
2480 ? GOT_TYPE_TLS_NOFFSET
2481 : GOT_TYPE_TLS_PAIR);
07f397ab
ILT		 2482 unsigned int got_offset;
2483 if (gsym != NULL)
2484 {
c2b45e22
CC		 2485 gold_assert(gsym->has_got_offset(got_type));
2486 got_offset = gsym->got_offset(got_type) - target->got_size();
07f397ab
ILT		 2487 }
2488 else
2489 {
2490 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
c2b45e22
CC		 2491 gold_assert(object->local_has_got_offset(r_sym, got_type));
2492 got_offset = (object->local_got_offset(r_sym, got_type)
07f397ab
ILT		 2493 - target->got_size());
2494 }
2495 if (optimized_type == tls::TLSOPT_TO_IE)
2496 {
2497 gold_assert(tls_segment != NULL);
7bf1f802
ILT		 2498 this->tls_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
2499 got_offset, view, view_size);
07f397ab
ILT		 2500 break;
2501 }
2502 else if (optimized_type == tls::TLSOPT_NONE)
2503 {
2504 // Relocate the field with the offset of the pair of GOT
2505 // entries.
2506 Relocate_functions<32, false>::rel32(view, got_offset);
2507 break;
2508 }
2509 }
75f2446e
ILT		 2510 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2511 _("unsupported reloc %u"),
2512 r_type);
92e059d8
ILT		 2513 break;
2514
56622147
ILT		 2515 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
2516 case elfcpp::R_386_TLS_DESC_CALL:
497897f9 2517 this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
c2b45e22
CC		 2518 if (optimized_type == tls::TLSOPT_TO_LE)
2519 {
2520 gold_assert(tls_segment != NULL);
2521 this->tls_desc_gd_to_le(relinfo, relnum, tls_segment,
2522 rel, r_type, value, view,
2523 view_size);
2524 break;
2525 }
2526 else
2527 {
2528 unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE
2529 ? GOT_TYPE_TLS_NOFFSET
2530 : GOT_TYPE_TLS_DESC);
a8df5856
ILT		 2531 unsigned int got_offset = 0;
2532 if (r_type == elfcpp::R_386_TLS_GOTDESC
2533 && optimized_type == tls::TLSOPT_NONE)
2534 {
2535 // We created GOT entries in the .got.tlsdesc portion of
2536 // the .got.plt section, but the offset stored in the
2537 // symbol is the offset within .got.tlsdesc.
2538 got_offset = (target->got_size()
2539 + target->got_plt_section()->data_size());
2540 }
c2b45e22
CC		 2541 if (gsym != NULL)
2542 {
2543 gold_assert(gsym->has_got_offset(got_type));
a8df5856 2544 got_offset += gsym->got_offset(got_type) - target->got_size();
c2b45e22
CC		 2545 }
2546 else
2547 {
2548 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
2549 gold_assert(object->local_has_got_offset(r_sym, got_type));
a8df5856
ILT		 2550 got_offset += (object->local_got_offset(r_sym, got_type)
2551 - target->got_size());
c2b45e22
CC		 2552 }
2553 if (optimized_type == tls::TLSOPT_TO_IE)
2554 {
2555 gold_assert(tls_segment != NULL);
2556 this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, rel, r_type,
2557 got_offset, view, view_size);
2558 break;
2559 }
2560 else if (optimized_type == tls::TLSOPT_NONE)
2561 {
2562 if (r_type == elfcpp::R_386_TLS_GOTDESC)
2563 {
2564 // Relocate the field with the offset of the pair of GOT
2565 // entries.
2566 Relocate_functions<32, false>::rel32(view, got_offset);
2567 }
2568 break;
2569 }
2570 }
75f2446e
ILT		 2571 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2572 _("unsupported reloc %u"),
2573 r_type);
ead1e424
ILT		 2574 break;
2575
56622147 2576 case elfcpp::R_386_TLS_LDM: // Local-dynamic
46cf9fa2
ILT		 2577 if (this->local_dynamic_type_ == LOCAL_DYNAMIC_SUN)
2578 {
75f2446e
ILT		 2579 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2580 _("both SUN and GNU model "
2581 "TLS relocations"));
2582 break;
46cf9fa2
ILT		 2583 }
2584 this->local_dynamic_type_ = LOCAL_DYNAMIC_GNU;
af6359d5 2585 if (optimized_type == tls::TLSOPT_TO_LE)
46cf9fa2 2586 {
07f397ab 2587 gold_assert(tls_segment != NULL);
46cf9fa2
ILT		 2588 this->tls_ld_to_le(relinfo, relnum, tls_segment, rel, r_type,
2589 value, view, view_size);
2590 break;
2591 }
07f397ab
ILT		 2592 else if (optimized_type == tls::TLSOPT_NONE)
2593 {
2594 // Relocate the field with the offset of the GOT entry for
2595 // the module index.
2596 unsigned int got_offset;
94c4710f
ILT		 2597 got_offset = (target->got_mod_index_entry(NULL, NULL, NULL)
2598 - target->got_size());
07f397ab
ILT		 2599 Relocate_functions<32, false>::rel32(view, got_offset);
2600 break;
2601 }
75f2446e
ILT		 2602 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2603 _("unsupported reloc %u"),
2604 r_type);
46cf9fa2
ILT		 2605 break;
2606
56622147 2607 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
d6f22b98 2608 if (optimized_type == tls::TLSOPT_TO_LE)
e8a9fcda 2609 {
82bb573a
ILT		 2610 // This reloc can appear in debugging sections, in which
2611 // case we must not convert to local-exec. We decide what
2612 // to do based on whether the section is marked as
2613 // containing executable code. That is what the GNU linker
2614 // does as well.
2615 elfcpp::Shdr<32, false> shdr(relinfo->data_shdr);
2616 if ((shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0)
d6f22b98
ILT		 2617 {
2618 gold_assert(tls_segment != NULL);
2619 value -= tls_segment->memsz();
2620 }
e8a9fcda 2621 }
46cf9fa2
ILT		 2622 Relocate_functions<32, false>::rel32(view, value);
2623 break;
2624
56622147
ILT		 2625 case elfcpp::R_386_TLS_IE: // Initial-exec
2626 case elfcpp::R_386_TLS_GOTIE:
2627 case elfcpp::R_386_TLS_IE_32:
2628 if (optimized_type == tls::TLSOPT_TO_LE)
2629 {
07f397ab 2630 gold_assert(tls_segment != NULL);
56622147
ILT		 2631 Target_i386::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment,
2632 rel, r_type, value, view,
2633 view_size);
2634 break;
2635 }
07f397ab
ILT		 2636 else if (optimized_type == tls::TLSOPT_NONE)
2637 {
2638 // Relocate the field with the offset of the GOT entry for
2639 // the tp-relative offset of the symbol.
c2b45e22
CC		 2640 unsigned int got_type = (r_type == elfcpp::R_386_TLS_IE_32
2641 ? GOT_TYPE_TLS_OFFSET
2642 : GOT_TYPE_TLS_NOFFSET);
07f397ab
ILT		 2643 unsigned int got_offset;
2644 if (gsym != NULL)
2645 {
c2b45e22
CC		 2646 gold_assert(gsym->has_got_offset(got_type));
2647 got_offset = gsym->got_offset(got_type);
07f397ab
ILT		 2648 }
2649 else
2650 {
2651 unsigned int r_sym = elfcpp::elf_r_sym<32>(rel.get_r_info());
c2b45e22
CC		 2652 gold_assert(object->local_has_got_offset(r_sym, got_type));
2653 got_offset = object->local_got_offset(r_sym, got_type);
07f397ab
ILT		 2654 }
2655 // For the R_386_TLS_IE relocation, we need to apply the
2656 // absolute address of the GOT entry.
2657 if (r_type == elfcpp::R_386_TLS_IE)
2658 got_offset += target->got_plt_section()->address();
2659 // All GOT offsets are relative to the end of the GOT.
2660 got_offset -= target->got_size();
2661 Relocate_functions<32, false>::rel32(view, got_offset);
2662 break;
2663 }
75f2446e
ILT		 2664 gold_error_at_location(relinfo, relnum, rel.get_r_offset(),
2665 _("unsupported reloc %u"),
2666 r_type);
92e059d8 2667 break;
92e059d8 2668
56622147 2669 case elfcpp::R_386_TLS_LE: // Local-exec
7bf1f802
ILT		 2670 // If we're creating a shared library, a dynamic relocation will
2671 // have been created for this location, so do not apply it now.
8851ecca 2672 if (!parameters->options().shared())
7bf1f802
ILT		 2673 {
2674 gold_assert(tls_segment != NULL);
2675 value -= tls_segment->memsz();
2676 Relocate_functions<32, false>::rel32(view, value);
2677 }
56622147 2678 break;
92e059d8 2679
56622147 2680 case elfcpp::R_386_TLS_LE_32:
7bf1f802
ILT		 2681 // If we're creating a shared library, a dynamic relocation will
2682 // have been created for this location, so do not apply it now.
8851ecca 2683 if (!parameters->options().shared())
7bf1f802
ILT		 2684 {
2685 gold_assert(tls_segment != NULL);
2686 value = tls_segment->memsz() - value;
2687 Relocate_functions<32, false>::rel32(view, value);
2688 }
56622147 2689 break;
92e059d8 2690 }
92e059d8
ILT		 2691}
2692
e041f13d 2693// Do a relocation in which we convert a TLS General-Dynamic to a
ead1e424
ILT		 2694// Local-Exec.
2695
2696inline void
2697Target_i386::Relocate::tls_gd_to_le(const Relocate_info<32, false>* relinfo,
2698 size_t relnum,
2699 Output_segment* tls_segment,
2700 const elfcpp::Rel<32, false>& rel,
2701 unsigned int,
2702 elfcpp::Elf_types<32>::Elf_Addr value,
2703 unsigned char* view,
fe8718a4 2704 section_size_type view_size)
ead1e424
ILT		 2705{
2706 // leal foo(,%reg,1),%eax; call ___tls_get_addr
46cf9fa2 2707 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
ead1e424
ILT		 2708 // leal foo(%reg),%eax; call ___tls_get_addr
2709 // ==> movl %gs:0,%eax; subl $foo@tpoff,%eax
2710
af6359d5
ILT		 2711 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2712 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
ead1e424
ILT		 2713
2714 unsigned char op1 = view[-1];
2715 unsigned char op2 = view[-2];
2716
af6359d5
ILT		 2717 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2718 op2 == 0x8d || op2 == 0x04);
2719 tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
ead1e424
ILT		 2720
2721 int roff = 5;
2722
2723 if (op2 == 0x04)
2724 {
af6359d5
ILT		 2725 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
2726 tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
2727 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2728 ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
ead1e424
ILT		 2729 memcpy(view - 3, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2730 }
2731 else
2732 {
af6359d5
ILT		 2733 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2734 (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
fe8718a4 2735 if (rel.get_r_offset() + 9 < view_size
d61c17ea 2736 && view[9] == 0x90)
ead1e424
ILT		 2737 {
2738 // There is a trailing nop. Use the size byte subl.
2739 memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2740 roff = 6;
2741 }
2742 else
2743 {
2744 // Use the five byte subl.
2745 memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2746 }
2747 }
2748
7bf1f802 2749 value = tls_segment->memsz() - value;
ead1e424
ILT		 2750 Relocate_functions<32, false>::rel32(view + roff, value);
2751
2752 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2753 // We can skip it.
2754 this->skip_call_tls_get_addr_ = true;
2755}
2756
7bf1f802 2757// Do a relocation in which we convert a TLS General-Dynamic to an
07f397ab
ILT		 2758// Initial-Exec.
2759
2760inline void
2761Target_i386::Relocate::tls_gd_to_ie(const Relocate_info<32, false>* relinfo,
2762 size_t relnum,
c2b45e22 2763 Output_segment*,
07f397ab
ILT		 2764 const elfcpp::Rel<32, false>& rel,
2765 unsigned int,
2766 elfcpp::Elf_types<32>::Elf_Addr value,
2767 unsigned char* view,
fe8718a4 2768 section_size_type view_size)
07f397ab
ILT		 2769{
2770 // leal foo(,%ebx,1),%eax; call ___tls_get_addr
2771 // ==> movl %gs:0,%eax; addl foo@gotntpoff(%ebx),%eax
2772
2773 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2774 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
2775
2776 unsigned char op1 = view[-1];
2777 unsigned char op2 = view[-2];
2778
2779 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2780 op2 == 0x8d || op2 == 0x04);
2781 tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
2782
2783 int roff = 5;
2784
c2b45e22
CC		 2785 // FIXME: For now, support only the first (SIB) form.
2786 tls::check_tls(relinfo, relnum, rel.get_r_offset(), op2 == 0x04);
07f397ab
ILT		 2787
2788 if (op2 == 0x04)
2789 {
2790 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -3);
2791 tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[-3] == 0x8d);
2792 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2793 ((op1 & 0xc7) == 0x05 && op1 != (4 << 3)));
2794 memcpy(view - 3, "\x65\xa1\0\0\0\0\x03\x83\0\0\0", 12);
2795 }
2796 else
2797 {
2798 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2799 (op1 & 0xf8) == 0x80 && (op1 & 7) != 4);
fe8718a4 2800 if (rel.get_r_offset() + 9 < view_size
07f397ab
ILT		 2801 && view[9] == 0x90)
2802 {
2803 // FIXME: This is not the right instruction sequence.
2804 // There is a trailing nop. Use the size byte subl.
2805 memcpy(view - 2, "\x65\xa1\0\0\0\0\x81\xe8\0\0\0", 12);
2806 roff = 6;
2807 }
2808 else
2809 {
2810 // FIXME: This is not the right instruction sequence.
2811 // Use the five byte subl.
2812 memcpy(view - 2, "\x65\xa1\0\0\0\0\x2d\0\0\0", 11);
2813 }
2814 }
2815
07f397ab
ILT		 2816 Relocate_functions<32, false>::rel32(view + roff, value);
2817
2818 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2819 // We can skip it.
2820 this->skip_call_tls_get_addr_ = true;
2821}
2822
c2b45e22
CC		 2823// Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2824// General-Dynamic to a Local-Exec.
2825
2826inline void
2827Target_i386::Relocate::tls_desc_gd_to_le(
2828 const Relocate_info<32, false>* relinfo,
2829 size_t relnum,
2830 Output_segment* tls_segment,
2831 const elfcpp::Rel<32, false>& rel,
2832 unsigned int r_type,
2833 elfcpp::Elf_types<32>::Elf_Addr value,
2834 unsigned char* view,
2835 section_size_type view_size)
2836{
2837 if (r_type == elfcpp::R_386_TLS_GOTDESC)
2838 {
2839 // leal foo@TLSDESC(%ebx), %eax
2840 // ==> leal foo@NTPOFF, %eax
2841 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2842 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2843 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2844 view[-2] == 0x8d && view[-1] == 0x83);
2845 view[-1] = 0x05;
2846 value -= tls_segment->memsz();
2847 Relocate_functions<32, false>::rel32(view, value);
2848 }
2849 else
2850 {
2851 // call *foo@TLSCALL(%eax)
2852 // ==> nop; nop
2853 gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL);
2854 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2);
2855 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2856 view[0] == 0xff && view[1] == 0x10);
2857 view[0] = 0x66;
2858 view[1] = 0x90;
2859 }
2860}
2861
2862// Do a relocation in which we convert a TLS_GOTDESC or TLS_DESC_CALL
2863// General-Dynamic to an Initial-Exec.
2864
2865inline void
2866Target_i386::Relocate::tls_desc_gd_to_ie(
2867 const Relocate_info<32, false>* relinfo,
2868 size_t relnum,
2869 Output_segment*,
2870 const elfcpp::Rel<32, false>& rel,
2871 unsigned int r_type,
2872 elfcpp::Elf_types<32>::Elf_Addr value,
2873 unsigned char* view,
2874 section_size_type view_size)
2875{
2876 if (r_type == elfcpp::R_386_TLS_GOTDESC)
2877 {
2878 // leal foo@TLSDESC(%ebx), %eax
2879 // ==> movl foo@GOTNTPOFF(%ebx), %eax
2880 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2881 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2882 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2883 view[-2] == 0x8d && view[-1] == 0x83);
2884 view[-2] = 0x8b;
2885 Relocate_functions<32, false>::rel32(view, value);
2886 }
2887 else
2888 {
2889 // call *foo@TLSCALL(%eax)
2890 // ==> nop; nop
2891 gold_assert(r_type == elfcpp::R_386_TLS_DESC_CALL);
2892 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 2);
2893 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2894 view[0] == 0xff && view[1] == 0x10);
2895 view[0] = 0x66;
2896 view[1] = 0x90;
2897 }
2898}
2899
46cf9fa2
ILT		 2900// Do a relocation in which we convert a TLS Local-Dynamic to a
2901// Local-Exec.
2902
2903inline void
2904Target_i386::Relocate::tls_ld_to_le(const Relocate_info<32, false>* relinfo,
2905 size_t relnum,
2906 Output_segment*,
2907 const elfcpp::Rel<32, false>& rel,
2908 unsigned int,
2909 elfcpp::Elf_types<32>::Elf_Addr,
2910 unsigned char* view,
fe8718a4 2911 section_size_type view_size)
46cf9fa2
ILT		 2912{
2913 // leal foo(%reg), %eax; call ___tls_get_addr
2914 // ==> movl %gs:0,%eax; nop; leal 0(%esi,1),%esi
2915
af6359d5
ILT		 2916 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2917 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 9);
46cf9fa2
ILT		 2918
2919 // FIXME: Does this test really always pass?
af6359d5
ILT		 2920 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2921 view[-2] == 0x8d && view[-1] == 0x83);
46cf9fa2 2922
af6359d5 2923 tls::check_tls(relinfo, relnum, rel.get_r_offset(), view[4] == 0xe8);
46cf9fa2
ILT		 2924
2925 memcpy(view - 2, "\x65\xa1\0\0\0\0\x90\x8d\x74\x26\0", 11);
2926
2927 // The next reloc should be a PLT32 reloc against __tls_get_addr.
2928 // We can skip it.
2929 this->skip_call_tls_get_addr_ = true;
2930}
2931
56622147
ILT		 2932// Do a relocation in which we convert a TLS Initial-Exec to a
2933// Local-Exec.
2934
2935inline void
2936Target_i386::Relocate::tls_ie_to_le(const Relocate_info<32, false>* relinfo,
2937 size_t relnum,
2938 Output_segment* tls_segment,
2939 const elfcpp::Rel<32, false>& rel,
2940 unsigned int r_type,
2941 elfcpp::Elf_types<32>::Elf_Addr value,
2942 unsigned char* view,
fe8718a4 2943 section_size_type view_size)
56622147
ILT		 2944{
2945 // We have to actually change the instructions, which means that we
2946 // need to examine the opcodes to figure out which instruction we
2947 // are looking at.
2948 if (r_type == elfcpp::R_386_TLS_IE)
2949 {
2950 // movl %gs:XX,%eax ==> movl $YY,%eax
2951 // movl %gs:XX,%reg ==> movl $YY,%reg
2952 // addl %gs:XX,%reg ==> addl $YY,%reg
2953 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -1);
2954 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2955
2956 unsigned char op1 = view[-1];
2957 if (op1 == 0xa1)
2958 {
2959 // movl XX,%eax ==> movl $YY,%eax
2960 view[-1] = 0xb8;
2961 }
2962 else
2963 {
2964 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2965
2966 unsigned char op2 = view[-2];
2967 if (op2 == 0x8b)
2968 {
2969 // movl XX,%reg ==> movl $YY,%reg
2970 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2971 (op1 & 0xc7) == 0x05);
2972 view[-2] = 0xc7;
2973 view[-1] = 0xc0 | ((op1 >> 3) & 7);
2974 }
2975 else if (op2 == 0x03)
2976 {
2977 // addl XX,%reg ==> addl $YY,%reg
2978 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2979 (op1 & 0xc7) == 0x05);
2980 view[-2] = 0x81;
2981 view[-1] = 0xc0 | ((op1 >> 3) & 7);
2982 }
2983 else
2984 tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0);
2985 }
2986 }
2987 else
2988 {
2989 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
2990 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
2991 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
2992 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, -2);
2993 tls::check_range(relinfo, relnum, rel.get_r_offset(), view_size, 4);
2994
2995 unsigned char op1 = view[-1];
2996 unsigned char op2 = view[-2];
2997 tls::check_tls(relinfo, relnum, rel.get_r_offset(),
2998 (op1 & 0xc0) == 0x80 && (op1 & 7) != 4);
2999 if (op2 == 0x8b)
3000 {
3001 // movl %gs:XX(%reg1),%reg2 ==> movl $YY,%reg2
3002 view[-2] = 0xc7;
3003 view[-1] = 0xc0 | ((op1 >> 3) & 7);
3004 }
3005 else if (op2 == 0x2b)
3006 {
3007 // subl %gs:XX(%reg1),%reg2 ==> subl $YY,%reg2
3008 view[-2] = 0x81;
3009 view[-1] = 0xe8 | ((op1 >> 3) & 7);
3010 }
3011 else if (op2 == 0x03)
3012 {
3013 // addl %gs:XX(%reg1),%reg2 ==> addl $YY,$reg2
3014 view[-2] = 0x81;
3015 view[-1] = 0xc0 | ((op1 >> 3) & 7);
3016 }
3017 else
3018 tls::check_tls(relinfo, relnum, rel.get_r_offset(), 0);
3019 }
3020
7bf1f802 3021 value = tls_segment->memsz() - value;
56622147
ILT		 3022 if (r_type == elfcpp::R_386_TLS_IE || r_type == elfcpp::R_386_TLS_GOTIE)
3023 value = - value;
3024
3025 Relocate_functions<32, false>::rel32(view, value);
3026}
3027
61ba1cf9
ILT		 3028// Relocate section data.
3029
3030void
92e059d8 3031Target_i386::relocate_section(const Relocate_info<32, false>* relinfo,
61ba1cf9
ILT		 3032 unsigned int sh_type,
3033 const unsigned char* prelocs,
3034 size_t reloc_count,
730cdc88
ILT		 3035 Output_section* output_section,
3036 bool needs_special_offset_handling,
61ba1cf9
ILT		 3037 unsigned char* view,
3038 elfcpp::Elf_types<32>::Elf_Addr address,
364c7fa5
ILT		 3039 section_size_type view_size,
3040 const Reloc_symbol_changes* reloc_symbol_changes)
61ba1cf9 3041{
a3ad94ed 3042 gold_assert(sh_type == elfcpp::SHT_REL);
61ba1cf9 3043
ead1e424
ILT		 3044 gold::relocate_section<32, false, Target_i386, elfcpp::SHT_REL,
3045 Target_i386::Relocate>(
92e059d8 3046 relinfo,
ead1e424 3047 this,
61ba1cf9
ILT		 3048 prelocs,
3049 reloc_count,
730cdc88
ILT		 3050 output_section,
3051 needs_special_offset_handling,
61ba1cf9
ILT		 3052 view,
3053 address,
364c7fa5
ILT		 3054 view_size,
3055 reloc_symbol_changes);
61ba1cf9
ILT		 3056}
3057
6a74a719
ILT		 3058// Return the size of a relocation while scanning during a relocatable
3059// link.
3060
3061unsigned int
3062Target_i386::Relocatable_size_for_reloc::get_size_for_reloc(
3063 unsigned int r_type,
3064 Relobj* object)
3065{
3066 switch (r_type)
3067 {
3068 case elfcpp::R_386_NONE:
3069 case elfcpp::R_386_GNU_VTINHERIT:
3070 case elfcpp::R_386_GNU_VTENTRY:
3071 case elfcpp::R_386_TLS_GD: // Global-dynamic
3072 case elfcpp::R_386_TLS_GOTDESC: // Global-dynamic (from ~oliva url)
3073 case elfcpp::R_386_TLS_DESC_CALL:
3074 case elfcpp::R_386_TLS_LDM: // Local-dynamic
3075 case elfcpp::R_386_TLS_LDO_32: // Alternate local-dynamic
3076 case elfcpp::R_386_TLS_IE: // Initial-exec
3077 case elfcpp::R_386_TLS_IE_32:
3078 case elfcpp::R_386_TLS_GOTIE:
3079 case elfcpp::R_386_TLS_LE: // Local-exec
3080 case elfcpp::R_386_TLS_LE_32:
3081 return 0;
3082
3083 case elfcpp::R_386_32:
3084 case elfcpp::R_386_PC32:
3085 case elfcpp::R_386_GOT32:
3086 case elfcpp::R_386_PLT32:
3087 case elfcpp::R_386_GOTOFF:
3088 case elfcpp::R_386_GOTPC:
3089 return 4;
3090
3091 case elfcpp::R_386_16:
3092 case elfcpp::R_386_PC16:
3093 return 2;
3094
3095 case elfcpp::R_386_8:
3096 case elfcpp::R_386_PC8:
3097 return 1;
3098
3099 // These are relocations which should only be seen by the
3100 // dynamic linker, and should never be seen here.
3101 case elfcpp::R_386_COPY:
3102 case elfcpp::R_386_GLOB_DAT:
3103 case elfcpp::R_386_JUMP_SLOT:
3104 case elfcpp::R_386_RELATIVE:
7223e9ca 3105 case elfcpp::R_386_IRELATIVE:
6a74a719
ILT		 3106 case elfcpp::R_386_TLS_TPOFF:
3107 case elfcpp::R_386_TLS_DTPMOD32:
3108 case elfcpp::R_386_TLS_DTPOFF32:
3109 case elfcpp::R_386_TLS_TPOFF32:
3110 case elfcpp::R_386_TLS_DESC:
3111 object->error(_("unexpected reloc %u in object file"), r_type);
3112 return 0;
3113
3114 case elfcpp::R_386_32PLT:
3115 case elfcpp::R_386_TLS_GD_32:
3116 case elfcpp::R_386_TLS_GD_PUSH:
3117 case elfcpp::R_386_TLS_GD_CALL:
3118 case elfcpp::R_386_TLS_GD_POP:
3119 case elfcpp::R_386_TLS_LDM_32:
3120 case elfcpp::R_386_TLS_LDM_PUSH:
3121 case elfcpp::R_386_TLS_LDM_CALL:
3122 case elfcpp::R_386_TLS_LDM_POP:
3123 case elfcpp::R_386_USED_BY_INTEL_200:
3124 default:
3125 object->error(_("unsupported reloc %u in object file"), r_type);
3126 return 0;
3127 }
3128}
3129
3130// Scan the relocs during a relocatable link.
3131
3132void
ad0f2072 3133Target_i386::scan_relocatable_relocs(Symbol_table* symtab,
6a74a719 3134 Layout* layout,
6fa2a40b 3135 Sized_relobj_file<32, false>* object,
6a74a719
ILT		 3136 unsigned int data_shndx,
3137 unsigned int sh_type,
3138 const unsigned char* prelocs,
3139 size_t reloc_count,
3140 Output_section* output_section,
3141 bool needs_special_offset_handling,
3142 size_t local_symbol_count,
3143 const unsigned char* plocal_symbols,
3144 Relocatable_relocs* rr)
3145{
3146 gold_assert(sh_type == elfcpp::SHT_REL);
3147
3148 typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_REL,
3149 Relocatable_size_for_reloc> Scan_relocatable_relocs;
3150
7019cd25 3151 gold::scan_relocatable_relocs<32, false, elfcpp::SHT_REL,
6a74a719 3152 Scan_relocatable_relocs>(
6a74a719
ILT		 3153 symtab,
3154 layout,
3155 object,
3156 data_shndx,
3157 prelocs,
3158 reloc_count,
3159 output_section,
3160 needs_special_offset_handling,
3161 local_symbol_count,
3162 plocal_symbols,
3163 rr);
3164}
3165
3166// Relocate a section during a relocatable link.
3167
3168void
3169Target_i386::relocate_for_relocatable(
3170 const Relocate_info<32, false>* relinfo,
3171 unsigned int sh_type,
3172 const unsigned char* prelocs,
3173 size_t reloc_count,
3174 Output_section* output_section,
3175 off_t offset_in_output_section,
3176 const Relocatable_relocs* rr,
3177 unsigned char* view,
3178 elfcpp::Elf_types<32>::Elf_Addr view_address,
3179 section_size_type view_size,
3180 unsigned char* reloc_view,
3181 section_size_type reloc_view_size)
3182{
3183 gold_assert(sh_type == elfcpp::SHT_REL);
3184
7019cd25 3185 gold::relocate_for_relocatable<32, false, elfcpp::SHT_REL>(
6a74a719
ILT		 3186 relinfo,
3187 prelocs,
3188 reloc_count,
3189 output_section,
3190 offset_in_output_section,
3191 rr,
3192 view,
3193 view_address,
3194 view_size,
3195 reloc_view,
3196 reloc_view_size);
3197}
3198
ab5c9e90
ILT		 3199// Return the value to use for a dynamic which requires special
3200// treatment. This is how we support equality comparisons of function
3201// pointers across shared library boundaries, as described in the
3202// processor specific ABI supplement.
3203
3204uint64_t
3205Target_i386::do_dynsym_value(const Symbol* gsym) const
3206{
3207 gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset());
3208 return this->plt_section()->address() + gsym->plt_offset();
3209}
3210
c51e6221
ILT		 3211// Return a string used to fill a code section with nops to take up
3212// the specified length.
3213
3214std::string
8851ecca 3215Target_i386::do_code_fill(section_size_type length) const
c51e6221
ILT		 3216{
3217 if (length >= 16)
3218 {
3219 // Build a jmp instruction to skip over the bytes.
3220 unsigned char jmp[5];
3221 jmp[0] = 0xe9;
3222 elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5);
3223 return (std::string(reinterpret_cast<char*>(&jmp[0]), 5)
3224 + std::string(length - 5, '\0'));
3225 }
3226
3227 // Nop sequences of various lengths.
3228 const char nop1[1] = { 0x90 }; // nop
3229 const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax
3230 const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi
3231 const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi
3232 const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop
3233 0x00 }; // leal 0(%esi,1),%esi
3234 const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3235 0x00, 0x00 };
3236 const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
3237 0x00, 0x00, 0x00 };
3238 const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop
3239 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi
3240 const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi
3241 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi
3242 0x00 };
3243 const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi
3244 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi
3245 0x00, 0x00 };
3246 const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi
3247 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi
3248 0x00, 0x00, 0x00 };
3249 const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3250 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi
3251 0x00, 0x00, 0x00, 0x00 };
3252 const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi
3253 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi
3254 0x27, 0x00, 0x00, 0x00,
3255 0x00 };
3256 const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi
3257 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi
3258 0xbc, 0x27, 0x00, 0x00,
3259 0x00, 0x00 };
3260 const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15
3261 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,...
3262 0x90, 0x90, 0x90, 0x90,
3263 0x90, 0x90, 0x90 };
3264
3265 const char* nops[16] = {
3266 NULL,
3267 nop1, nop2, nop3, nop4, nop5, nop6, nop7,
3268 nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15
3269 };
3270
3271 return std::string(nops[length], length);
3272}
3273
02d7cd44
ILT		 3274// Return the value to use for the base of a DW_EH_PE_datarel offset
3275// in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their
3276// assembler can not write out the difference between two labels in
3277// different sections, so instead of using a pc-relative value they
3278// use an offset from the GOT.
3279
3280uint64_t
3281Target_i386::do_ehframe_datarel_base() const
3282{
3283 gold_assert(this->global_offset_table_ != NULL);
3284 Symbol* sym = this->global_offset_table_;
3285 Sized_symbol<32>* ssym = static_cast<Sized_symbol<32>*>(sym);
3286 return ssym->value();
3287}
3288
b6848d3c
ILT		 3289// Return whether SYM should be treated as a call to a non-split
3290// function. We don't want that to be true of a call to a
3291// get_pc_thunk function.
3292
3293bool
3294Target_i386::do_is_call_to_non_split(const Symbol* sym, unsigned int) const
3295{
3296 return (sym->type() == elfcpp::STT_FUNC
b6848d3c
ILT		 3297 && !is_prefix_of("__i686.get_pc_thunk.", sym->name()));
3298}
3299
364c7fa5 3300// FNOFFSET in section SHNDX in OBJECT is the start of a function
9b547ce6 3301// compiled with -fsplit-stack. The function calls non-split-stack
364c7fa5
ILT		 3302// code. We have to change the function so that it always ensures
3303// that it has enough stack space to run some random function.
3304
3305void
3306Target_i386::do_calls_non_split(Relobj* object, unsigned int shndx,
3307 section_offset_type fnoffset,
3308 section_size_type fnsize,
3309 unsigned char* view,
3310 section_size_type view_size,
3311 std::string* from,
3312 std::string* to) const
3313{
3314 // The function starts with a comparison of the stack pointer and a
3315 // field in the TCB. This is followed by a jump.
3316
3317 // cmp %gs:NN,%esp
3318 if (this->match_view(view, view_size, fnoffset, "\x65\x3b\x25", 3)
3319 && fnsize > 7)
3320 {
3321 // We will call __morestack if the carry flag is set after this
3322 // comparison. We turn the comparison into an stc instruction
3323 // and some nops.
3324 view[fnoffset] = '\xf9';
3325 this->set_view_to_nop(view, view_size, fnoffset + 1, 6);
3326 }
3327 // lea NN(%esp),%ecx
1782c879
ILT		 3328 // lea NN(%esp),%edx
3329 else if ((this->match_view(view, view_size, fnoffset, "\x8d\x8c\x24", 3)
3330 || this->match_view(view, view_size, fnoffset, "\x8d\x94\x24", 3))
364c7fa5
ILT		 3331 && fnsize > 7)
3332 {
3333 // This is loading an offset from the stack pointer for a
3334 // comparison. The offset is negative, so we decrease the
3335 // offset by the amount of space we need for the stack. This
3336 // means we will avoid calling __morestack if there happens to
3337 // be plenty of space on the stack already.
3338 unsigned char* pval = view + fnoffset + 3;
3339 uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval);
3340 val -= parameters->options().split_stack_adjust_size();
3341 elfcpp::Swap_unaligned<32, false>::writeval(pval, val);
3342 }
3343 else
3344 {
3345 if (!object->has_no_split_stack())
3346 object->error(_("failed to match split-stack sequence at "
3347 "section %u offset %0zx"),
ac33a407 3348 shndx, static_cast<size_t>(fnoffset));
364c7fa5
ILT		 3349 return;
3350 }
3351
3352 // We have to change the function so that it calls
3353 // __morestack_non_split instead of __morestack. The former will
3354 // allocate additional stack space.
3355 *from = "__morestack";
3356 *to = "__morestack_non_split";
3357}
3358
14bfc3f5
ILT		 3359// The selector for i386 object files.
3360
36959681 3361class Target_selector_i386 : public Target_selector_freebsd
14bfc3f5
ILT		 3362{
3363public:
3364 Target_selector_i386()
36959681 3365 : Target_selector_freebsd(elfcpp::EM_386, 32, false,
03ef7571
ILT		 3366 "elf32-i386", "elf32-i386-freebsd",
3367 "elf_i386")
14bfc3f5
ILT		 3368 { }
3369
3370 Target*
e96caa79
ILT		 3371 do_instantiate_target()
3372 { return new Target_i386(); }
14bfc3f5
ILT		 3373};
3374
14bfc3f5
ILT		 3375Target_selector_i386 target_selector_i386;
3376
3377} // End anonymous namespace.
GDB Binutils - Deliverables
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