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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
a8df5856 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
2e30d253 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8b105e34 ILT |
8 | // This program is free software; you can redistribute it and/or modify |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
2e30d253 ILT |
11 | // (at your option) any later version. |
12 | ||
8b105e34 ILT |
13 | // This program is distributed in the hope that it will be useful, |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
2e30d253 ILT |
22 | |
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
26 | ||
27 | #include "elfcpp.h" | |
28 | #include "parameters.h" | |
29 | #include "reloc.h" | |
30 | #include "x86_64.h" | |
31 | #include "object.h" | |
32 | #include "symtab.h" | |
33 | #include "layout.h" | |
34 | #include "output.h" | |
12c0daef | 35 | #include "copy-relocs.h" |
2e30d253 ILT |
36 | #include "target.h" |
37 | #include "target-reloc.h" | |
38 | #include "target-select.h" | |
e041f13d | 39 | #include "tls.h" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
21bb3914 | 42 | #include "icf.h" |
2e30d253 ILT |
43 | |
44 | namespace | |
45 | { | |
46 | ||
47 | using namespace gold; | |
48 | ||
7223e9ca ILT |
49 | // A class to handle the PLT data. |
50 | ||
51 | class Output_data_plt_x86_64 : public Output_section_data | |
52 | { | |
53 | public: | |
54 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
55 | ||
4829d394 CC |
56 | Output_data_plt_x86_64(Symbol_table* symtab, Layout* layout, |
57 | Output_data_got<64, false>* got, | |
58 | Output_data_space* got_plt) | |
59 | : Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), | |
60 | count_(0), tlsdesc_got_offset_(-1U), free_list_() | |
61 | { this->init(symtab, layout); } | |
62 | ||
63 | Output_data_plt_x86_64(Symbol_table* symtab, Layout* layout, | |
64 | Output_data_got<64, false>* got, | |
65 | Output_data_space* got_plt, | |
66 | unsigned int plt_count) | |
67 | : Output_section_data((plt_count + 1) * plt_entry_size, 8, false), | |
68 | tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), | |
69 | count_(plt_count), tlsdesc_got_offset_(-1U), free_list_() | |
70 | { | |
71 | this->init(symtab, layout); | |
72 | ||
73 | // Initialize the free list and reserve the first entry. | |
74 | this->free_list_.init((plt_count + 1) * plt_entry_size, false); | |
75 | this->free_list_.remove(0, plt_entry_size); | |
76 | } | |
77 | ||
78 | // Initialize the PLT section. | |
79 | void | |
80 | init(Symbol_table* symtab, Layout* layout); | |
7223e9ca ILT |
81 | |
82 | // Add an entry to the PLT. | |
83 | void | |
84 | add_entry(Symbol* gsym); | |
85 | ||
86 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
87 | unsigned int | |
88 | add_local_ifunc_entry(Sized_relobj<64, false>* relobj, | |
89 | unsigned int local_sym_index); | |
90 | ||
4829d394 CC |
91 | // Add the relocation for a PLT entry. |
92 | void | |
93 | add_relocation(Symbol* gsym, unsigned int got_offset); | |
94 | ||
7223e9ca ILT |
95 | // Add the reserved TLSDESC_PLT entry to the PLT. |
96 | void | |
97 | reserve_tlsdesc_entry(unsigned int got_offset) | |
98 | { this->tlsdesc_got_offset_ = got_offset; } | |
99 | ||
100 | // Return true if a TLSDESC_PLT entry has been reserved. | |
101 | bool | |
102 | has_tlsdesc_entry() const | |
103 | { return this->tlsdesc_got_offset_ != -1U; } | |
104 | ||
105 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
106 | unsigned int | |
107 | get_tlsdesc_got_offset() const | |
108 | { return this->tlsdesc_got_offset_; } | |
109 | ||
110 | // Return the offset of the reserved TLSDESC_PLT entry. | |
111 | unsigned int | |
112 | get_tlsdesc_plt_offset() const | |
113 | { return (this->count_ + 1) * plt_entry_size; } | |
114 | ||
115 | // Return the .rela.plt section data. | |
116 | Reloc_section* | |
117 | rela_plt() | |
118 | { return this->rel_; } | |
119 | ||
120 | // Return where the TLSDESC relocations should go. | |
121 | Reloc_section* | |
122 | rela_tlsdesc(Layout*); | |
123 | ||
124 | // Return the number of PLT entries. | |
125 | unsigned int | |
126 | entry_count() const | |
127 | { return this->count_; } | |
128 | ||
129 | // Return the offset of the first non-reserved PLT entry. | |
130 | static unsigned int | |
131 | first_plt_entry_offset() | |
132 | { return plt_entry_size; } | |
133 | ||
134 | // Return the size of a PLT entry. | |
135 | static unsigned int | |
136 | get_plt_entry_size() | |
137 | { return plt_entry_size; } | |
138 | ||
4829d394 CC |
139 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
140 | void | |
141 | reserve_slot(unsigned int plt_index) | |
142 | { | |
143 | this->free_list_.remove((plt_index + 1) * plt_entry_size, | |
144 | (plt_index + 2) * plt_entry_size); | |
145 | } | |
146 | ||
7223e9ca ILT |
147 | protected: |
148 | void | |
149 | do_adjust_output_section(Output_section* os); | |
150 | ||
151 | // Write to a map file. | |
152 | void | |
153 | do_print_to_mapfile(Mapfile* mapfile) const | |
154 | { mapfile->print_output_data(this, _("** PLT")); } | |
155 | ||
156 | private: | |
157 | // The size of an entry in the PLT. | |
158 | static const int plt_entry_size = 16; | |
159 | ||
160 | // The first entry in the PLT. | |
161 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
162 | // procedure linkage table for both programs and shared objects." | |
163 | static unsigned char first_plt_entry[plt_entry_size]; | |
164 | ||
165 | // Other entries in the PLT for an executable. | |
166 | static unsigned char plt_entry[plt_entry_size]; | |
167 | ||
168 | // The reserved TLSDESC entry in the PLT for an executable. | |
169 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
170 | ||
171 | // Set the final size. | |
172 | void | |
173 | set_final_data_size(); | |
174 | ||
175 | // Write out the PLT data. | |
176 | void | |
177 | do_write(Output_file*); | |
178 | ||
179 | // The reloc section. | |
180 | Reloc_section* rel_; | |
181 | // The TLSDESC relocs, if necessary. These must follow the regular | |
182 | // PLT relocs. | |
183 | Reloc_section* tlsdesc_rel_; | |
184 | // The .got section. | |
185 | Output_data_got<64, false>* got_; | |
186 | // The .got.plt section. | |
187 | Output_data_space* got_plt_; | |
188 | // The number of PLT entries. | |
189 | unsigned int count_; | |
190 | // Offset of the reserved TLSDESC_GOT entry when needed. | |
191 | unsigned int tlsdesc_got_offset_; | |
4829d394 CC |
192 | // List of available regions within the section, for incremental |
193 | // update links. | |
194 | Free_list free_list_; | |
7223e9ca | 195 | }; |
2e30d253 ILT |
196 | |
197 | // The x86_64 target class. | |
d61c17ea ILT |
198 | // See the ABI at |
199 | // http://www.x86-64.org/documentation/abi.pdf | |
200 | // TLS info comes from | |
201 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 202 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 203 | |
36959681 | 204 | class Target_x86_64 : public Target_freebsd<64, false> |
2e30d253 ILT |
205 | { |
206 | public: | |
e822f2b1 ILT |
207 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
208 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
209 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
210 | ||
211 | Target_x86_64() | |
36959681 | 212 | : Target_freebsd<64, false>(&x86_64_info), |
a8df5856 ILT |
213 | got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL), |
214 | global_offset_table_(NULL), rela_dyn_(NULL), | |
215 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), | |
e291e7b9 ILT |
216 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
217 | tls_base_symbol_defined_(false) | |
2e30d253 ILT |
218 | { } |
219 | ||
21bb3914 ST |
220 | // This function should be defined in targets that can use relocation |
221 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
222 | // and global_reloc_may_be_function_pointer) | |
223 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
224 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
225 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
226 | inline bool | |
227 | can_check_for_function_pointers() const | |
228 | { return !parameters->options().pie(); } | |
229 | ||
c95e9f27 ST |
230 | virtual bool |
231 | can_icf_inline_merge_sections () const | |
232 | { return true; } | |
233 | ||
8a5e3e08 ILT |
234 | // Hook for a new output section. |
235 | void | |
236 | do_new_output_section(Output_section*) const; | |
237 | ||
6d03d481 ST |
238 | // Scan the relocations to look for symbol adjustments. |
239 | void | |
ad0f2072 | 240 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
241 | Layout* layout, |
242 | Sized_relobj<64, false>* object, | |
243 | unsigned int data_shndx, | |
244 | unsigned int sh_type, | |
245 | const unsigned char* prelocs, | |
246 | size_t reloc_count, | |
247 | Output_section* output_section, | |
248 | bool needs_special_offset_handling, | |
249 | size_t local_symbol_count, | |
250 | const unsigned char* plocal_symbols); | |
251 | ||
2e30d253 ILT |
252 | // Scan the relocations to look for symbol adjustments. |
253 | void | |
ad0f2072 | 254 | scan_relocs(Symbol_table* symtab, |
2e30d253 ILT |
255 | Layout* layout, |
256 | Sized_relobj<64, false>* object, | |
257 | unsigned int data_shndx, | |
258 | unsigned int sh_type, | |
259 | const unsigned char* prelocs, | |
260 | size_t reloc_count, | |
730cdc88 ILT |
261 | Output_section* output_section, |
262 | bool needs_special_offset_handling, | |
2e30d253 | 263 | size_t local_symbol_count, |
730cdc88 | 264 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
265 | |
266 | // Finalize the sections. | |
267 | void | |
f59f41f3 | 268 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 269 | |
4fb6c25d ILT |
270 | // Return the value to use for a dynamic which requires special |
271 | // treatment. | |
272 | uint64_t | |
273 | do_dynsym_value(const Symbol*) const; | |
274 | ||
2e30d253 ILT |
275 | // Relocate a section. |
276 | void | |
277 | relocate_section(const Relocate_info<64, false>*, | |
278 | unsigned int sh_type, | |
279 | const unsigned char* prelocs, | |
280 | size_t reloc_count, | |
730cdc88 ILT |
281 | Output_section* output_section, |
282 | bool needs_special_offset_handling, | |
2e30d253 ILT |
283 | unsigned char* view, |
284 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
285 | section_size_type view_size, |
286 | const Reloc_symbol_changes*); | |
2e30d253 | 287 | |
6a74a719 ILT |
288 | // Scan the relocs during a relocatable link. |
289 | void | |
ad0f2072 | 290 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
291 | Layout* layout, |
292 | Sized_relobj<64, false>* object, | |
293 | unsigned int data_shndx, | |
294 | unsigned int sh_type, | |
295 | const unsigned char* prelocs, | |
296 | size_t reloc_count, | |
297 | Output_section* output_section, | |
298 | bool needs_special_offset_handling, | |
299 | size_t local_symbol_count, | |
300 | const unsigned char* plocal_symbols, | |
301 | Relocatable_relocs*); | |
302 | ||
303 | // Relocate a section during a relocatable link. | |
304 | void | |
305 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
306 | unsigned int sh_type, | |
307 | const unsigned char* prelocs, | |
308 | size_t reloc_count, | |
309 | Output_section* output_section, | |
310 | off_t offset_in_output_section, | |
311 | const Relocatable_relocs*, | |
312 | unsigned char* view, | |
313 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
314 | section_size_type view_size, | |
315 | unsigned char* reloc_view, | |
316 | section_size_type reloc_view_size); | |
317 | ||
2e30d253 ILT |
318 | // Return a string used to fill a code section with nops. |
319 | std::string | |
8851ecca | 320 | do_code_fill(section_size_type length) const; |
2e30d253 | 321 | |
9a2d6984 ILT |
322 | // Return whether SYM is defined by the ABI. |
323 | bool | |
9c2d0ef9 | 324 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
325 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
326 | ||
e291e7b9 ILT |
327 | // Return the symbol index to use for a target specific relocation. |
328 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
329 | // local symbol, which is an absolute reloc. | |
330 | unsigned int | |
331 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
332 | { | |
333 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
334 | return 0; | |
335 | } | |
336 | ||
337 | // Return the addend to use for a target specific relocation. | |
338 | uint64_t | |
339 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
340 | ||
7223e9ca ILT |
341 | // Return the PLT section. |
342 | Output_data* | |
343 | do_plt_section_for_global(const Symbol*) const | |
344 | { return this->plt_section(); } | |
345 | ||
346 | Output_data* | |
347 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
348 | { return this->plt_section(); } | |
349 | ||
9b547ce6 | 350 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
351 | void |
352 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
353 | section_offset_type fnoffset, section_size_type fnsize, | |
354 | unsigned char* view, section_size_type view_size, | |
355 | std::string* from, std::string* to) const; | |
356 | ||
96f2030e | 357 | // Return the size of the GOT section. |
fe8718a4 | 358 | section_size_type |
0e70b911 | 359 | got_size() const |
96f2030e ILT |
360 | { |
361 | gold_assert(this->got_ != NULL); | |
362 | return this->got_->data_size(); | |
363 | } | |
364 | ||
0e70b911 CC |
365 | // Return the number of entries in the GOT. |
366 | unsigned int | |
367 | got_entry_count() const | |
368 | { | |
369 | if (this->got_ == NULL) | |
370 | return 0; | |
371 | return this->got_size() / 8; | |
372 | } | |
373 | ||
374 | // Return the number of entries in the PLT. | |
375 | unsigned int | |
376 | plt_entry_count() const; | |
377 | ||
378 | // Return the offset of the first non-reserved PLT entry. | |
379 | unsigned int | |
380 | first_plt_entry_offset() const; | |
381 | ||
382 | // Return the size of each PLT entry. | |
383 | unsigned int | |
384 | plt_entry_size() const; | |
385 | ||
4829d394 CC |
386 | // Create the GOT section for an incremental update. |
387 | Output_data_got<64, false>* | |
388 | init_got_plt_for_update(Symbol_table* symtab, | |
389 | Layout* layout, | |
390 | unsigned int got_count, | |
391 | unsigned int plt_count); | |
392 | ||
393 | // Register an existing PLT entry for a global symbol. | |
394 | // A target needs to implement this to support incremental linking. | |
395 | void | |
396 | register_global_plt_entry(unsigned int plt_index, Symbol* gsym); | |
397 | ||
94a3fc8b CC |
398 | // Apply an incremental relocation. |
399 | void | |
400 | apply_relocation(const Relocate_info<64, false>* relinfo, | |
401 | elfcpp::Elf_types<64>::Elf_Addr r_offset, | |
402 | unsigned int r_type, | |
403 | elfcpp::Elf_types<64>::Elf_Swxword r_addend, | |
404 | const Symbol* gsym, | |
405 | unsigned char* view, | |
406 | elfcpp::Elf_types<64>::Elf_Addr address, | |
407 | section_size_type view_size); | |
408 | ||
e291e7b9 ILT |
409 | // Add a new reloc argument, returning the index in the vector. |
410 | size_t | |
411 | add_tlsdesc_info(Sized_relobj<64, false>* object, unsigned int r_sym) | |
412 | { | |
413 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
414 | return this->tlsdesc_reloc_info_.size() - 1; | |
415 | } | |
416 | ||
2e30d253 ILT |
417 | private: |
418 | // The class which scans relocations. | |
a036edd8 | 419 | class Scan |
2e30d253 | 420 | { |
a036edd8 ILT |
421 | public: |
422 | Scan() | |
423 | : issued_non_pic_error_(false) | |
424 | { } | |
425 | ||
95a2c8d6 RS |
426 | static inline int |
427 | get_reference_flags(unsigned int r_type); | |
428 | ||
2e30d253 | 429 | inline void |
ad0f2072 | 430 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
431 | Sized_relobj<64, false>* object, |
432 | unsigned int data_shndx, | |
07f397ab | 433 | Output_section* output_section, |
2e30d253 ILT |
434 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
435 | const elfcpp::Sym<64, false>& lsym); | |
436 | ||
437 | inline void | |
ad0f2072 | 438 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
439 | Sized_relobj<64, false>* object, |
440 | unsigned int data_shndx, | |
07f397ab | 441 | Output_section* output_section, |
2e30d253 ILT |
442 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
443 | Symbol* gsym); | |
e041f13d | 444 | |
21bb3914 ST |
445 | inline bool |
446 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
447 | Target_x86_64* target, | |
448 | Sized_relobj<64, false>* object, | |
449 | unsigned int data_shndx, | |
450 | Output_section* output_section, | |
451 | const elfcpp::Rela<64, false>& reloc, | |
452 | unsigned int r_type, | |
453 | const elfcpp::Sym<64, false>& lsym); | |
454 | ||
455 | inline bool | |
456 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
457 | Target_x86_64* target, | |
458 | Sized_relobj<64, false>* object, | |
459 | unsigned int data_shndx, | |
460 | Output_section* output_section, | |
461 | const elfcpp::Rela<64, false>& reloc, | |
462 | unsigned int r_type, | |
463 | Symbol* gsym); | |
464 | ||
a036edd8 | 465 | private: |
e041f13d ILT |
466 | static void |
467 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
468 | ||
469 | static void | |
470 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
471 | Symbol*); | |
a036edd8 ILT |
472 | |
473 | void | |
474 | check_non_pic(Relobj*, unsigned int r_type); | |
475 | ||
21bb3914 ST |
476 | inline bool |
477 | possible_function_pointer_reloc(unsigned int r_type); | |
478 | ||
7223e9ca ILT |
479 | bool |
480 | reloc_needs_plt_for_ifunc(Sized_relobj<64, false>*, unsigned int r_type); | |
481 | ||
a036edd8 ILT |
482 | // Whether we have issued an error about a non-PIC compilation. |
483 | bool issued_non_pic_error_; | |
2e30d253 ILT |
484 | }; |
485 | ||
486 | // The class which implements relocation. | |
487 | class Relocate | |
488 | { | |
489 | public: | |
490 | Relocate() | |
36171d64 | 491 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
492 | { } |
493 | ||
494 | ~Relocate() | |
495 | { | |
496 | if (this->skip_call_tls_get_addr_) | |
497 | { | |
498 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 499 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
500 | } |
501 | } | |
502 | ||
503 | // Do a relocation. Return false if the caller should not issue | |
504 | // any warnings about this relocation. | |
505 | inline bool | |
031cdbed ILT |
506 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
507 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
508 | unsigned int r_type, const Sized_symbol<64>*, |
509 | const Symbol_value<64>*, | |
510 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 511 | section_size_type); |
2e30d253 ILT |
512 | |
513 | private: | |
514 | // Do a TLS relocation. | |
515 | inline void | |
7bf1f802 ILT |
516 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
517 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
518 | unsigned int r_type, const Sized_symbol<64>*, |
519 | const Symbol_value<64>*, | |
fe8718a4 ILT |
520 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
521 | section_size_type); | |
2e30d253 | 522 | |
c2b45e22 | 523 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
524 | inline void |
525 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
526 | Output_segment* tls_segment, | |
527 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
528 | elfcpp::Elf_types<64>::Elf_Addr value, | |
529 | unsigned char* view, | |
c2b45e22 | 530 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 531 | section_size_type view_size); |
7bf1f802 | 532 | |
56622147 ILT |
533 | // Do a TLS General-Dynamic to Local-Exec transition. |
534 | inline void | |
535 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
536 | Output_segment* tls_segment, |
537 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
538 | elfcpp::Elf_types<64>::Elf_Addr value, | |
539 | unsigned char* view, | |
fe8718a4 | 540 | section_size_type view_size); |
2e30d253 | 541 | |
c2b45e22 CC |
542 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
543 | inline void | |
544 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
545 | Output_segment* tls_segment, | |
546 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
547 | elfcpp::Elf_types<64>::Elf_Addr value, | |
548 | unsigned char* view, | |
549 | elfcpp::Elf_types<64>::Elf_Addr, | |
550 | section_size_type view_size); | |
551 | ||
552 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
553 | inline void | |
554 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
555 | Output_segment* tls_segment, | |
556 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
557 | elfcpp::Elf_types<64>::Elf_Addr value, | |
558 | unsigned char* view, | |
559 | section_size_type view_size); | |
560 | ||
56622147 | 561 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 562 | inline void |
56622147 | 563 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
564 | Output_segment* tls_segment, |
565 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
566 | elfcpp::Elf_types<64>::Elf_Addr value, | |
567 | unsigned char* view, | |
fe8718a4 | 568 | section_size_type view_size); |
2e30d253 | 569 | |
56622147 ILT |
570 | // Do a TLS Initial-Exec to Local-Exec transition. |
571 | static inline void | |
572 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
573 | Output_segment* tls_segment, |
574 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
575 | elfcpp::Elf_types<64>::Elf_Addr value, | |
576 | unsigned char* view, | |
fe8718a4 | 577 | section_size_type view_size); |
2e30d253 ILT |
578 | |
579 | // This is set if we should skip the next reloc, which should be a | |
580 | // PLT32 reloc against ___tls_get_addr. | |
581 | bool skip_call_tls_get_addr_; | |
582 | }; | |
583 | ||
6a74a719 ILT |
584 | // A class which returns the size required for a relocation type, |
585 | // used while scanning relocs during a relocatable link. | |
586 | class Relocatable_size_for_reloc | |
587 | { | |
588 | public: | |
589 | unsigned int | |
590 | get_size_for_reloc(unsigned int, Relobj*); | |
591 | }; | |
592 | ||
2e30d253 ILT |
593 | // Adjust TLS relocation type based on the options and whether this |
594 | // is a local symbol. | |
e041f13d | 595 | static tls::Tls_optimization |
2e30d253 ILT |
596 | optimize_tls_reloc(bool is_final, int r_type); |
597 | ||
598 | // Get the GOT section, creating it if necessary. | |
599 | Output_data_got<64, false>* | |
600 | got_section(Symbol_table*, Layout*); | |
601 | ||
96f2030e ILT |
602 | // Get the GOT PLT section. |
603 | Output_data_space* | |
604 | got_plt_section() const | |
605 | { | |
606 | gold_assert(this->got_plt_ != NULL); | |
607 | return this->got_plt_; | |
608 | } | |
609 | ||
a8df5856 ILT |
610 | // Get the GOT section for TLSDESC entries. |
611 | Output_data_got<64, false>* | |
612 | got_tlsdesc_section() const | |
613 | { | |
614 | gold_assert(this->got_tlsdesc_ != NULL); | |
615 | return this->got_tlsdesc_; | |
616 | } | |
617 | ||
c2b45e22 CC |
618 | // Create the PLT section. |
619 | void | |
620 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
621 | ||
2e30d253 ILT |
622 | // Create a PLT entry for a global symbol. |
623 | void | |
624 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
625 | ||
7223e9ca ILT |
626 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
627 | void | |
628 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
629 | Sized_relobj<64, false>* relobj, | |
630 | unsigned int local_sym_index); | |
631 | ||
9fa33bee | 632 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
633 | void |
634 | define_tls_base_symbol(Symbol_table*, Layout*); | |
635 | ||
c2b45e22 CC |
636 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
637 | void | |
638 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
639 | ||
31d60480 ILT |
640 | // Create a GOT entry for the TLS module index. |
641 | unsigned int | |
642 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
643 | Sized_relobj<64, false>* object); | |
644 | ||
2e30d253 ILT |
645 | // Get the PLT section. |
646 | Output_data_plt_x86_64* | |
647 | plt_section() const | |
648 | { | |
649 | gold_assert(this->plt_ != NULL); | |
650 | return this->plt_; | |
651 | } | |
652 | ||
653 | // Get the dynamic reloc section, creating it if necessary. | |
654 | Reloc_section* | |
0ffd9845 | 655 | rela_dyn_section(Layout*); |
2e30d253 | 656 | |
e291e7b9 ILT |
657 | // Get the section to use for TLSDESC relocations. |
658 | Reloc_section* | |
659 | rela_tlsdesc_section(Layout*) const; | |
660 | ||
12c0daef | 661 | // Add a potential copy relocation. |
2e30d253 | 662 | void |
ef9beddf ILT |
663 | copy_reloc(Symbol_table* symtab, Layout* layout, |
664 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
665 | unsigned int shndx, Output_section* output_section, |
666 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
667 | { | |
668 | this->copy_relocs_.copy_reloc(symtab, layout, | |
669 | symtab->get_sized_symbol<64>(sym), | |
670 | object, shndx, output_section, | |
671 | reloc, this->rela_dyn_section(layout)); | |
672 | } | |
2e30d253 ILT |
673 | |
674 | // Information about this specific target which we pass to the | |
675 | // general Target structure. | |
676 | static const Target::Target_info x86_64_info; | |
677 | ||
0e70b911 CC |
678 | // The types of GOT entries needed for this platform. |
679 | // These values are exposed to the ABI in an incremental link. | |
680 | // Do not renumber existing values without changing the version | |
681 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
682 | enum Got_type |
683 | { | |
684 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
685 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
686 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
687 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
688 | }; | |
689 | ||
e291e7b9 ILT |
690 | // This type is used as the argument to the target specific |
691 | // relocation routines. The only target specific reloc is | |
692 | // R_X86_64_TLSDESC against a local symbol. | |
693 | struct Tlsdesc_info | |
694 | { | |
695 | Tlsdesc_info(Sized_relobj<64, false>* a_object, unsigned int a_r_sym) | |
696 | : object(a_object), r_sym(a_r_sym) | |
697 | { } | |
698 | ||
699 | // The object in which the local symbol is defined. | |
700 | Sized_relobj<64, false>* object; | |
701 | // The local symbol index in the object. | |
702 | unsigned int r_sym; | |
703 | }; | |
704 | ||
2e30d253 ILT |
705 | // The GOT section. |
706 | Output_data_got<64, false>* got_; | |
707 | // The PLT section. | |
708 | Output_data_plt_x86_64* plt_; | |
709 | // The GOT PLT section. | |
710 | Output_data_space* got_plt_; | |
a8df5856 ILT |
711 | // The GOT section for TLSDESC relocations. |
712 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
713 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
714 | Symbol* global_offset_table_; | |
2e30d253 | 715 | // The dynamic reloc section. |
0ffd9845 | 716 | Reloc_section* rela_dyn_; |
2e30d253 | 717 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 718 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
719 | // Space for variables copied with a COPY reloc. |
720 | Output_data_space* dynbss_; | |
c2b45e22 | 721 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 722 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
723 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
724 | // specific relocation. Here we store the object and local symbol | |
725 | // index for the relocation. | |
726 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
727 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
728 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
729 | }; |
730 | ||
731 | const Target::Target_info Target_x86_64::x86_64_info = | |
732 | { | |
733 | 64, // size | |
734 | false, // is_big_endian | |
735 | elfcpp::EM_X86_64, // machine_code | |
736 | false, // has_make_symbol | |
737 | false, // has_resolve | |
738 | true, // has_code_fill | |
35cdfc9a | 739 | true, // is_default_stack_executable |
0864d551 | 740 | '\0', // wrap_char |
2e30d253 | 741 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 742 | 0x400000, // default_text_segment_address |
cd72c291 | 743 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
744 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
745 | elfcpp::SHN_UNDEF, // small_common_shndx | |
746 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
747 | 0, // small_common_section_flags | |
05a352e6 DK |
748 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
749 | NULL, // attributes_section | |
750 | NULL // attributes_vendor | |
2e30d253 ILT |
751 | }; |
752 | ||
8a5e3e08 ILT |
753 | // This is called when a new output section is created. This is where |
754 | // we handle the SHF_X86_64_LARGE. | |
755 | ||
756 | void | |
ca09d69a | 757 | Target_x86_64::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
758 | { |
759 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
760 | os->set_is_large_section(); | |
761 | } | |
762 | ||
2e30d253 ILT |
763 | // Get the GOT section, creating it if necessary. |
764 | ||
765 | Output_data_got<64, false>* | |
766 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
767 | { | |
768 | if (this->got_ == NULL) | |
769 | { | |
770 | gold_assert(symtab != NULL && layout != NULL); | |
771 | ||
772 | this->got_ = new Output_data_got<64, false>(); | |
773 | ||
82742395 ILT |
774 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
775 | (elfcpp::SHF_ALLOC | |
776 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
777 | this->got_, ORDER_RELRO_LAST, |
778 | true); | |
2e30d253 | 779 | |
7d9e3d98 | 780 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
781 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
782 | (elfcpp::SHF_ALLOC | |
783 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
784 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
785 | false); | |
2e30d253 ILT |
786 | |
787 | // The first three entries are reserved. | |
27bc2bce | 788 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 789 | |
1a2dff53 ILT |
790 | // Those bytes can go into the relro segment. |
791 | layout->increase_relro(3 * 8); | |
792 | ||
2e30d253 | 793 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
794 | this->global_offset_table_ = |
795 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
796 | Symbol_table::PREDEFINED, | |
797 | this->got_plt_, | |
798 | 0, 0, elfcpp::STT_OBJECT, | |
799 | elfcpp::STB_LOCAL, | |
800 | elfcpp::STV_HIDDEN, 0, | |
801 | false, false); | |
a8df5856 ILT |
802 | |
803 | // If there are any TLSDESC relocations, they get GOT entries in | |
804 | // .got.plt after the jump slot entries. | |
805 | this->got_tlsdesc_ = new Output_data_got<64, false>(); | |
806 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
807 | (elfcpp::SHF_ALLOC | |
808 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
809 | this->got_tlsdesc_, |
810 | ORDER_NON_RELRO_FIRST, false); | |
2e30d253 ILT |
811 | } |
812 | ||
813 | return this->got_; | |
814 | } | |
815 | ||
816 | // Get the dynamic reloc section, creating it if necessary. | |
817 | ||
818 | Target_x86_64::Reloc_section* | |
0ffd9845 | 819 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 820 | { |
0ffd9845 | 821 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
822 | { |
823 | gold_assert(layout != NULL); | |
d98bc257 | 824 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 825 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
826 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
827 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 828 | } |
0ffd9845 | 829 | return this->rela_dyn_; |
2e30d253 ILT |
830 | } |
831 | ||
4829d394 | 832 | // Initialize the PLT section. |
2e30d253 | 833 | |
4829d394 CC |
834 | void |
835 | Output_data_plt_x86_64::init(Symbol_table* symtab, Layout* layout) | |
2e30d253 | 836 | { |
d98bc257 | 837 | this->rel_ = new Reloc_section(false); |
2e30d253 | 838 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
839 | elfcpp::SHF_ALLOC, this->rel_, |
840 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
841 | |
842 | if (parameters->doing_static_link()) | |
843 | { | |
844 | // A statically linked executable will only have a .rela.plt | |
845 | // section to hold R_X86_64_IRELATIVE relocs for STT_GNU_IFUNC | |
846 | // symbols. The library will use these symbols to locate the | |
847 | // IRELATIVE relocs at program startup time. | |
848 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
849 | Symbol_table::PREDEFINED, | |
850 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
851 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
852 | 0, false, true); | |
853 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
854 | Symbol_table::PREDEFINED, | |
855 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
856 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
857 | 0, true, true); | |
858 | } | |
2e30d253 ILT |
859 | } |
860 | ||
861 | void | |
862 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
863 | { | |
b0481b0b | 864 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
865 | } |
866 | ||
867 | // Add an entry to the PLT. | |
868 | ||
869 | void | |
870 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
871 | { | |
872 | gold_assert(!gsym->has_plt_offset()); | |
873 | ||
4829d394 CC |
874 | unsigned int plt_index; |
875 | off_t plt_offset; | |
876 | section_offset_type got_offset; | |
2e30d253 | 877 | |
4829d394 CC |
878 | if (!this->is_data_size_valid()) |
879 | { | |
880 | // Note that when setting the PLT offset we skip the initial | |
881 | // reserved PLT entry. | |
882 | plt_index = this->count_ + 1; | |
883 | plt_offset = plt_index * plt_entry_size; | |
2e30d253 | 884 | |
4829d394 | 885 | ++this->count_; |
2e30d253 | 886 | |
4829d394 CC |
887 | got_offset = (plt_index - 1 + 3) * 8; |
888 | gold_assert(got_offset == this->got_plt_->current_data_size()); | |
2e30d253 | 889 | |
4829d394 CC |
890 | // Every PLT entry needs a GOT entry which points back to the PLT |
891 | // entry (this will be changed by the dynamic linker, normally | |
892 | // lazily when the function is called). | |
893 | this->got_plt_->set_current_data_size(got_offset + 8); | |
894 | } | |
7223e9ca ILT |
895 | else |
896 | { | |
4829d394 CC |
897 | // For incremental updates, find an available slot. |
898 | plt_offset = this->free_list_.allocate(plt_entry_size, plt_entry_size, 0); | |
899 | if (plt_offset == -1) | |
900 | gold_fatal(_("out of patch space (PLT);" | |
901 | " relink with --incremental-full")); | |
902 | ||
903 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
904 | // can be calculated from the PLT index, adjusting for the three | |
905 | // reserved entries at the beginning of the GOT. | |
906 | plt_index = plt_offset / plt_entry_size - 1; | |
907 | got_offset = (plt_index - 1 + 3) * 8; | |
7223e9ca | 908 | } |
2e30d253 | 909 | |
4829d394 CC |
910 | gsym->set_plt_offset(plt_offset); |
911 | ||
912 | // Every PLT entry needs a reloc. | |
913 | this->add_relocation(gsym, got_offset); | |
914 | ||
2e30d253 ILT |
915 | // Note that we don't need to save the symbol. The contents of the |
916 | // PLT are independent of which symbols are used. The symbols only | |
917 | // appear in the relocations. | |
918 | } | |
919 | ||
7223e9ca ILT |
920 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
921 | // the PLT offset. | |
922 | ||
923 | unsigned int | |
924 | Output_data_plt_x86_64::add_local_ifunc_entry(Sized_relobj<64, false>* relobj, | |
925 | unsigned int local_sym_index) | |
926 | { | |
927 | unsigned int plt_offset = (this->count_ + 1) * plt_entry_size; | |
928 | ++this->count_; | |
929 | ||
930 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
931 | ||
932 | // Every PLT entry needs a GOT entry which points back to the PLT | |
933 | // entry. | |
934 | this->got_plt_->set_current_data_size(got_offset + 8); | |
935 | ||
936 | // Every PLT entry needs a reloc. | |
937 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, | |
938 | elfcpp::R_X86_64_IRELATIVE, | |
939 | this->got_plt_, got_offset, 0); | |
940 | ||
941 | return plt_offset; | |
942 | } | |
943 | ||
4829d394 CC |
944 | // Add the relocation for a PLT entry. |
945 | ||
946 | void | |
947 | Output_data_plt_x86_64::add_relocation(Symbol* gsym, unsigned int got_offset) | |
948 | { | |
949 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
950 | && gsym->can_use_relative_reloc(false)) | |
951 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
952 | this->got_plt_, got_offset, 0); | |
953 | else | |
954 | { | |
955 | gsym->set_needs_dynsym_entry(); | |
956 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
957 | got_offset, 0); | |
958 | } | |
959 | } | |
960 | ||
e291e7b9 ILT |
961 | // Return where the TLSDESC relocations should go, creating it if |
962 | // necessary. These follow the JUMP_SLOT relocations. | |
963 | ||
964 | Output_data_plt_x86_64::Reloc_section* | |
965 | Output_data_plt_x86_64::rela_tlsdesc(Layout* layout) | |
966 | { | |
967 | if (this->tlsdesc_rel_ == NULL) | |
968 | { | |
969 | this->tlsdesc_rel_ = new Reloc_section(false); | |
970 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
971 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 972 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
973 | gold_assert(this->tlsdesc_rel_->output_section() == |
974 | this->rel_->output_section()); | |
975 | } | |
976 | return this->tlsdesc_rel_; | |
977 | } | |
978 | ||
c2b45e22 CC |
979 | // Set the final size. |
980 | void | |
981 | Output_data_plt_x86_64::set_final_data_size() | |
982 | { | |
983 | unsigned int count = this->count_; | |
984 | if (this->has_tlsdesc_entry()) | |
985 | ++count; | |
986 | this->set_data_size((count + 1) * plt_entry_size); | |
987 | } | |
988 | ||
2e30d253 ILT |
989 | // The first entry in the PLT for an executable. |
990 | ||
991 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
992 | { | |
993 | // From AMD64 ABI Draft 0.98, page 76 | |
994 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 995 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
996 | 0xff, 0x25, // jmp indirect |
997 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
998 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
999 | }; | |
1000 | ||
1001 | // Subsequent entries in the PLT for an executable. | |
1002 | ||
1003 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
1004 | { | |
1005 | // From AMD64 ABI Draft 0.98, page 76 | |
1006 | 0xff, 0x25, // jmpq indirect | |
1007 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1008 | 0x68, // pushq immediate | |
1009 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1010 | 0xe9, // jmpq relative | |
1011 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1012 | }; | |
1013 | ||
c2b45e22 CC |
1014 | // The reserved TLSDESC entry in the PLT for an executable. |
1015 | ||
1016 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
1017 | { | |
1018 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1019 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1020 | 0xff, 0x35, // pushq x(%rip) | |
1021 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1022 | 0xff, 0x25, // jmpq *y(%rip) | |
1023 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1024 | 0x0f, 0x1f, // nop | |
1025 | 0x40, 0 | |
1026 | }; | |
1027 | ||
2e30d253 ILT |
1028 | // Write out the PLT. This uses the hand-coded instructions above, |
1029 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
1030 | ||
1031 | void | |
1032 | Output_data_plt_x86_64::do_write(Output_file* of) | |
1033 | { | |
2ea97941 | 1034 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1035 | const section_size_type oview_size = |
1036 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1037 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
1038 | |
1039 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
1040 | const section_size_type got_size = |
1041 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
1042 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1043 | got_size); | |
1044 | ||
1045 | unsigned char* pov = oview; | |
1046 | ||
c2b45e22 | 1047 | // The base address of the .plt section. |
a984ee1d | 1048 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 1049 | // The base address of the .got section. |
a984ee1d | 1050 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
1051 | // The base address of the PLT portion of the .got section, |
1052 | // which is where the GOT pointer will point, and where the | |
1053 | // three reserved GOT entries are located. | |
a984ee1d | 1054 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
1055 | |
1056 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 1057 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
1058 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
1059 | (got_address + 8 | |
1060 | - (plt_address + 6))); | |
1061 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1062 | (got_address + 16 | |
1063 | - (plt_address + 12))); | |
2e30d253 ILT |
1064 | pov += plt_entry_size; |
1065 | ||
1066 | unsigned char* got_pov = got_view; | |
1067 | ||
1068 | memset(got_pov, 0, 24); | |
1069 | got_pov += 24; | |
1070 | ||
1071 | unsigned int plt_offset = plt_entry_size; | |
1072 | unsigned int got_offset = 24; | |
1073 | const unsigned int count = this->count_; | |
1074 | for (unsigned int plt_index = 0; | |
1075 | plt_index < count; | |
1076 | ++plt_index, | |
1077 | pov += plt_entry_size, | |
1078 | got_pov += 8, | |
1079 | plt_offset += plt_entry_size, | |
1080 | got_offset += 8) | |
1081 | { | |
1082 | // Set and adjust the PLT entry itself. | |
1083 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
1084 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
1085 | (got_address + got_offset | |
1086 | - (plt_address + plt_offset | |
1087 | + 6))); | |
2e30d253 ILT |
1088 | |
1089 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1090 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1091 | - (plt_offset + plt_entry_size)); | |
1092 | ||
1093 | // Set the entry in the GOT. | |
1094 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1095 | } | |
1096 | ||
c2b45e22 CC |
1097 | if (this->has_tlsdesc_entry()) |
1098 | { | |
1099 | // Set and adjust the reserved TLSDESC PLT entry. | |
1100 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
1101 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1102 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1103 | (got_address + 8 | |
1104 | - (plt_address + plt_offset | |
1105 | + 6))); | |
1106 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1107 | (got_base | |
1108 | + tlsdesc_got_offset | |
1109 | - (plt_address + plt_offset | |
1110 | + 12))); | |
1111 | pov += plt_entry_size; | |
1112 | } | |
1113 | ||
fe8718a4 ILT |
1114 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1115 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1116 | |
2ea97941 | 1117 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1118 | of->write_output_view(got_file_offset, got_size, got_view); |
1119 | } | |
1120 | ||
c2b45e22 | 1121 | // Create the PLT section. |
2e30d253 ILT |
1122 | |
1123 | void | |
c2b45e22 | 1124 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1125 | { |
2e30d253 ILT |
1126 | if (this->plt_ == NULL) |
1127 | { | |
1128 | // Create the GOT sections first. | |
1129 | this->got_section(symtab, layout); | |
1130 | ||
7223e9ca | 1131 | this->plt_ = new Output_data_plt_x86_64(symtab, layout, this->got_, |
c2b45e22 | 1132 | this->got_plt_); |
2e30d253 ILT |
1133 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1134 | (elfcpp::SHF_ALLOC | |
1135 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1136 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1137 | |
1138 | // Make the sh_info field of .rela.plt point to .plt. | |
1139 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1140 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1141 | } |
c2b45e22 CC |
1142 | } |
1143 | ||
e291e7b9 ILT |
1144 | // Return the section for TLSDESC relocations. |
1145 | ||
1146 | Target_x86_64::Reloc_section* | |
1147 | Target_x86_64::rela_tlsdesc_section(Layout* layout) const | |
1148 | { | |
1149 | return this->plt_section()->rela_tlsdesc(layout); | |
1150 | } | |
1151 | ||
c2b45e22 CC |
1152 | // Create a PLT entry for a global symbol. |
1153 | ||
1154 | void | |
1155 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
1156 | Symbol* gsym) | |
1157 | { | |
1158 | if (gsym->has_plt_offset()) | |
1159 | return; | |
1160 | ||
1161 | if (this->plt_ == NULL) | |
1162 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
1163 | |
1164 | this->plt_->add_entry(gsym); | |
1165 | } | |
1166 | ||
7223e9ca ILT |
1167 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1168 | ||
1169 | void | |
1170 | Target_x86_64::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
1171 | Sized_relobj<64, false>* relobj, | |
1172 | unsigned int local_sym_index) | |
1173 | { | |
1174 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1175 | return; | |
1176 | if (this->plt_ == NULL) | |
1177 | this->make_plt_section(symtab, layout); | |
1178 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj, | |
1179 | local_sym_index); | |
1180 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1181 | } | |
1182 | ||
0e70b911 CC |
1183 | // Return the number of entries in the PLT. |
1184 | ||
1185 | unsigned int | |
1186 | Target_x86_64::plt_entry_count() const | |
1187 | { | |
1188 | if (this->plt_ == NULL) | |
1189 | return 0; | |
1190 | return this->plt_->entry_count(); | |
1191 | } | |
1192 | ||
1193 | // Return the offset of the first non-reserved PLT entry. | |
1194 | ||
1195 | unsigned int | |
1196 | Target_x86_64::first_plt_entry_offset() const | |
1197 | { | |
1198 | return Output_data_plt_x86_64::first_plt_entry_offset(); | |
1199 | } | |
1200 | ||
1201 | // Return the size of each PLT entry. | |
1202 | ||
1203 | unsigned int | |
1204 | Target_x86_64::plt_entry_size() const | |
1205 | { | |
1206 | return Output_data_plt_x86_64::get_plt_entry_size(); | |
1207 | } | |
1208 | ||
4829d394 CC |
1209 | // Create the GOT and PLT sections for an incremental update. |
1210 | ||
1211 | Output_data_got<64, false>* | |
1212 | Target_x86_64::init_got_plt_for_update(Symbol_table* symtab, | |
1213 | Layout* layout, | |
1214 | unsigned int got_count, | |
1215 | unsigned int plt_count) | |
1216 | { | |
1217 | gold_assert(this->got_ == NULL); | |
1218 | ||
1219 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
1220 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1221 | (elfcpp::SHF_ALLOC | |
1222 | | elfcpp::SHF_WRITE), | |
1223 | this->got_, ORDER_RELRO_LAST, | |
1224 | true); | |
1225 | ||
1226 | // Add the three reserved entries. | |
1227 | this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT"); | |
1228 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1229 | (elfcpp::SHF_ALLOC | |
1230 | | elfcpp::SHF_WRITE), | |
1231 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
1232 | false); | |
1233 | ||
1234 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1235 | this->global_offset_table_ = | |
1236 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1237 | Symbol_table::PREDEFINED, | |
1238 | this->got_plt_, | |
1239 | 0, 0, elfcpp::STT_OBJECT, | |
1240 | elfcpp::STB_LOCAL, | |
1241 | elfcpp::STV_HIDDEN, 0, | |
1242 | false, false); | |
1243 | ||
1244 | // If there are any TLSDESC relocations, they get GOT entries in | |
1245 | // .got.plt after the jump slot entries. | |
1246 | // FIXME: Get the count for TLSDESC entries. | |
1247 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
1248 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1249 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1250 | this->got_tlsdesc_, | |
1251 | ORDER_NON_RELRO_FIRST, false); | |
1252 | ||
1253 | // Create the PLT section. | |
1254 | this->plt_ = new Output_data_plt_x86_64(symtab, layout, this->got_, | |
1255 | this->got_plt_, plt_count); | |
1256 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
1257 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
1258 | this->plt_, ORDER_PLT, false); | |
1259 | ||
1260 | // Make the sh_info field of .rela.plt point to .plt. | |
1261 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1262 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
1263 | ||
1264 | return this->got_; | |
1265 | } | |
1266 | ||
1267 | // Register an existing PLT entry for a global symbol. | |
1268 | ||
1269 | void | |
1270 | Target_x86_64::register_global_plt_entry(unsigned int plt_index, | |
1271 | Symbol* gsym) | |
1272 | { | |
1273 | gold_assert(this->plt_ != NULL); | |
1274 | gold_assert(!gsym->has_plt_offset()); | |
1275 | ||
1276 | this->plt_->reserve_slot(plt_index); | |
1277 | ||
1278 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
1279 | ||
1280 | unsigned int got_offset = (plt_index + 3) * 8; | |
1281 | this->plt_->add_relocation(gsym, got_offset); | |
1282 | } | |
1283 | ||
9fa33bee | 1284 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1285 | |
1286 | void | |
1287 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1288 | { | |
1289 | if (this->tls_base_symbol_defined_) | |
1290 | return; | |
1291 | ||
1292 | Output_segment* tls_segment = layout->tls_segment(); | |
1293 | if (tls_segment != NULL) | |
1294 | { | |
183fd0e3 | 1295 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1296 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1297 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1298 | tls_segment, 0, 0, |
1299 | elfcpp::STT_TLS, | |
1300 | elfcpp::STB_LOCAL, | |
1301 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1302 | (is_exec |
1303 | ? Symbol::SEGMENT_END | |
1304 | : Symbol::SEGMENT_START), | |
1305 | true); | |
edfbb029 CC |
1306 | } |
1307 | this->tls_base_symbol_defined_ = true; | |
1308 | } | |
1309 | ||
c2b45e22 CC |
1310 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1311 | ||
1312 | void | |
1313 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
1314 | Layout* layout) | |
1315 | { | |
1316 | if (this->plt_ == NULL) | |
1317 | this->make_plt_section(symtab, layout); | |
1318 | ||
1319 | if (!this->plt_->has_tlsdesc_entry()) | |
1320 | { | |
1321 | // Allocate the TLSDESC_GOT entry. | |
1322 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1323 | unsigned int got_offset = got->add_constant(0); | |
1324 | ||
1325 | // Allocate the TLSDESC_PLT entry. | |
1326 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
1327 | } | |
1328 | } | |
1329 | ||
31d60480 ILT |
1330 | // Create a GOT entry for the TLS module index. |
1331 | ||
1332 | unsigned int | |
1333 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
1334 | Sized_relobj<64, false>* object) | |
1335 | { | |
1336 | if (this->got_mod_index_offset_ == -1U) | |
1337 | { | |
1338 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1339 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1340 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1341 | unsigned int got_offset = got->add_constant(0); | |
1342 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1343 | got_offset, 0); | |
009a67a2 | 1344 | got->add_constant(0); |
31d60480 ILT |
1345 | this->got_mod_index_offset_ = got_offset; |
1346 | } | |
1347 | return this->got_mod_index_offset_; | |
1348 | } | |
1349 | ||
2e30d253 ILT |
1350 | // Optimize the TLS relocation type based on what we know about the |
1351 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1352 | // known at link time. | |
1353 | ||
e041f13d | 1354 | tls::Tls_optimization |
2e30d253 ILT |
1355 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
1356 | { | |
2e30d253 ILT |
1357 | // If we are generating a shared library, then we can't do anything |
1358 | // in the linker. | |
8851ecca | 1359 | if (parameters->options().shared()) |
e041f13d | 1360 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1361 | |
1362 | switch (r_type) | |
1363 | { | |
1364 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1365 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1366 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1367 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1368 | // access. Since we know that we are generating an executable, |
1369 | // we can convert this to Initial-Exec. If we also know that | |
1370 | // this is a local symbol, we can further switch to Local-Exec. | |
1371 | if (is_final) | |
e041f13d ILT |
1372 | return tls::TLSOPT_TO_LE; |
1373 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1374 | |
d61c17ea | 1375 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1376 | // This is Local-Dynamic, which refers to a local symbol in the |
1377 | // dynamic TLS block. Since we know that we generating an | |
1378 | // executable, we can switch to Local-Exec. | |
e041f13d | 1379 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1380 | |
0ffd9845 | 1381 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1382 | case elfcpp::R_X86_64_DTPOFF64: |
1383 | // Another Local-Dynamic reloc. | |
e041f13d | 1384 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1385 | |
d61c17ea | 1386 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1387 | // These are Initial-Exec relocs which get the thread offset |
1388 | // from the GOT. If we know that we are linking against the | |
1389 | // local symbol, we can switch to Local-Exec, which links the | |
1390 | // thread offset into the instruction. | |
1391 | if (is_final) | |
e041f13d ILT |
1392 | return tls::TLSOPT_TO_LE; |
1393 | return tls::TLSOPT_NONE; | |
2e30d253 | 1394 | |
d61c17ea | 1395 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1396 | // When we already have Local-Exec, there is nothing further we |
1397 | // can do. | |
e041f13d | 1398 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1399 | |
1400 | default: | |
1401 | gold_unreachable(); | |
1402 | } | |
2e30d253 ILT |
1403 | } |
1404 | ||
95a2c8d6 RS |
1405 | // Get the Reference_flags for a particular relocation. |
1406 | ||
1407 | int | |
1408 | Target_x86_64::Scan::get_reference_flags(unsigned int r_type) | |
1409 | { | |
1410 | switch (r_type) | |
1411 | { | |
1412 | case elfcpp::R_X86_64_NONE: | |
1413 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
1414 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
1415 | case elfcpp::R_X86_64_GOTPC32: | |
1416 | case elfcpp::R_X86_64_GOTPC64: | |
1417 | // No symbol reference. | |
1418 | return 0; | |
1419 | ||
1420 | case elfcpp::R_X86_64_64: | |
1421 | case elfcpp::R_X86_64_32: | |
1422 | case elfcpp::R_X86_64_32S: | |
1423 | case elfcpp::R_X86_64_16: | |
1424 | case elfcpp::R_X86_64_8: | |
1425 | return Symbol::ABSOLUTE_REF; | |
1426 | ||
1427 | case elfcpp::R_X86_64_PC64: | |
1428 | case elfcpp::R_X86_64_PC32: | |
1429 | case elfcpp::R_X86_64_PC16: | |
1430 | case elfcpp::R_X86_64_PC8: | |
1431 | case elfcpp::R_X86_64_GOTOFF64: | |
1432 | return Symbol::RELATIVE_REF; | |
1433 | ||
1434 | case elfcpp::R_X86_64_PLT32: | |
1435 | case elfcpp::R_X86_64_PLTOFF64: | |
1436 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1437 | ||
1438 | case elfcpp::R_X86_64_GOT64: | |
1439 | case elfcpp::R_X86_64_GOT32: | |
1440 | case elfcpp::R_X86_64_GOTPCREL64: | |
1441 | case elfcpp::R_X86_64_GOTPCREL: | |
1442 | case elfcpp::R_X86_64_GOTPLT64: | |
1443 | // Absolute in GOT. | |
1444 | return Symbol::ABSOLUTE_REF; | |
1445 | ||
1446 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
1447 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
1448 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1449 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
1450 | case elfcpp::R_X86_64_DTPOFF32: | |
1451 | case elfcpp::R_X86_64_DTPOFF64: | |
1452 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
1453 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
1454 | return Symbol::TLS_REF; | |
1455 | ||
1456 | case elfcpp::R_X86_64_COPY: | |
1457 | case elfcpp::R_X86_64_GLOB_DAT: | |
1458 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1459 | case elfcpp::R_X86_64_RELATIVE: | |
1460 | case elfcpp::R_X86_64_IRELATIVE: | |
1461 | case elfcpp::R_X86_64_TPOFF64: | |
1462 | case elfcpp::R_X86_64_DTPMOD64: | |
1463 | case elfcpp::R_X86_64_TLSDESC: | |
1464 | case elfcpp::R_X86_64_SIZE32: | |
1465 | case elfcpp::R_X86_64_SIZE64: | |
1466 | default: | |
1467 | // Not expected. We will give an error later. | |
1468 | return 0; | |
1469 | } | |
1470 | } | |
1471 | ||
e041f13d ILT |
1472 | // Report an unsupported relocation against a local symbol. |
1473 | ||
1474 | void | |
1475 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
1476 | unsigned int r_type) | |
1477 | { | |
75f2446e ILT |
1478 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1479 | object->name().c_str(), r_type); | |
e041f13d ILT |
1480 | } |
1481 | ||
a036edd8 ILT |
1482 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1483 | // dynamic linker does not support it, issue an error. The GNU linker | |
1484 | // only issues a non-PIC error for an allocated read-only section. | |
1485 | // Here we know the section is allocated, but we don't know that it is | |
1486 | // read-only. But we check for all the relocation types which the | |
1487 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
1488 | // error even if the section is not read-only. | |
1489 | ||
1490 | void | |
1491 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
1492 | { | |
1493 | switch (r_type) | |
1494 | { | |
2fbb4320 ILT |
1495 | // These are the relocation types supported by glibc for x86_64 |
1496 | // which should always work. | |
a036edd8 | 1497 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 1498 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
1499 | case elfcpp::R_X86_64_GLOB_DAT: |
1500 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1501 | case elfcpp::R_X86_64_DTPMOD64: | |
1502 | case elfcpp::R_X86_64_DTPOFF64: | |
1503 | case elfcpp::R_X86_64_TPOFF64: | |
1504 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
1505 | case elfcpp::R_X86_64_COPY: |
1506 | return; | |
1507 | ||
1508 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 ILT |
1509 | case elfcpp::R_X86_64_32: |
1510 | case elfcpp::R_X86_64_PC32: | |
2fbb4320 ILT |
1511 | if (this->issued_non_pic_error_) |
1512 | return; | |
1513 | gold_assert(parameters->options().output_is_position_independent()); | |
1514 | object->error(_("requires dynamic reloc which may overflow at runtime; " | |
1515 | "recompile with -fPIC")); | |
1516 | this->issued_non_pic_error_ = true; | |
a036edd8 ILT |
1517 | return; |
1518 | ||
1519 | default: | |
1520 | // This prevents us from issuing more than one error per reloc | |
1521 | // section. But we can still wind up issuing more than one | |
1522 | // error per object file. | |
1523 | if (this->issued_non_pic_error_) | |
1524 | return; | |
33aea2fd | 1525 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
1526 | object->error(_("requires unsupported dynamic reloc; " |
1527 | "recompile with -fPIC")); | |
1528 | this->issued_non_pic_error_ = true; | |
1529 | return; | |
1530 | ||
1531 | case elfcpp::R_X86_64_NONE: | |
1532 | gold_unreachable(); | |
1533 | } | |
1534 | } | |
1535 | ||
7223e9ca ILT |
1536 | // Return whether we need to make a PLT entry for a relocation of the |
1537 | // given type against a STT_GNU_IFUNC symbol. | |
1538 | ||
1539 | bool | |
1540 | Target_x86_64::Scan::reloc_needs_plt_for_ifunc(Sized_relobj<64, false>* object, | |
1541 | unsigned int r_type) | |
1542 | { | |
95a2c8d6 RS |
1543 | int flags = Scan::get_reference_flags(r_type); |
1544 | if (flags & Symbol::TLS_REF) | |
1545 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1546 | object->name().c_str(), r_type); | |
1547 | return flags != 0; | |
7223e9ca ILT |
1548 | } |
1549 | ||
2e30d253 ILT |
1550 | // Scan a relocation for a local symbol. |
1551 | ||
1552 | inline void | |
ad0f2072 | 1553 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1554 | Layout* layout, |
1555 | Target_x86_64* target, | |
1556 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1557 | unsigned int data_shndx, |
4f4c5f80 | 1558 | Output_section* output_section, |
0ffd9845 | 1559 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1560 | unsigned int r_type, |
7bf1f802 | 1561 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 | 1562 | { |
7223e9ca ILT |
1563 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1564 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1565 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1566 | { | |
1567 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
1568 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1569 | } | |
1570 | ||
2e30d253 ILT |
1571 | switch (r_type) |
1572 | { | |
1573 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1574 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1575 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1576 | break; |
1577 | ||
1578 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1579 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1580 | // executable), we need to create a dynamic relocation for this |
1581 | // location. The relocation applied at link time will apply the | |
1582 | // link-time value, so we flag the location with an | |
1583 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1584 | // relocate it easily. |
8851ecca | 1585 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1586 | { |
e8c846c3 | 1587 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1588 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
1589 | rela_dyn->add_local_relative(object, r_sym, |
1590 | elfcpp::R_X86_64_RELATIVE, | |
1591 | output_section, data_shndx, | |
1592 | reloc.get_r_offset(), | |
1593 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1594 | } |
1595 | break; | |
1596 | ||
2e30d253 ILT |
1597 | case elfcpp::R_X86_64_32: |
1598 | case elfcpp::R_X86_64_32S: | |
1599 | case elfcpp::R_X86_64_16: | |
1600 | case elfcpp::R_X86_64_8: | |
96f2030e | 1601 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1602 | // executable), we need to create a dynamic relocation for this |
1603 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1604 | // because that is always a 64-bit relocation. | |
8851ecca | 1605 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1606 | { |
a036edd8 ILT |
1607 | this->check_non_pic(object, r_type); |
1608 | ||
96f2030e | 1609 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1610 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1611 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1612 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1613 | data_shndx, reloc.get_r_offset(), | |
1614 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1615 | else |
1616 | { | |
1617 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1618 | unsigned int shndx = lsym.get_st_shndx(); |
1619 | bool is_ordinary; | |
1620 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1621 | &is_ordinary); | |
1622 | if (!is_ordinary) | |
1623 | object->error(_("section symbol %u has bad shndx %u"), | |
1624 | r_sym, shndx); | |
1625 | else | |
1626 | rela_dyn->add_local_section(object, shndx, | |
1627 | r_type, output_section, | |
1628 | data_shndx, reloc.get_r_offset(), | |
1629 | reloc.get_r_addend()); | |
dceae3c1 | 1630 | } |
96f2030e | 1631 | } |
2e30d253 ILT |
1632 | break; |
1633 | ||
1634 | case elfcpp::R_X86_64_PC64: | |
1635 | case elfcpp::R_X86_64_PC32: | |
1636 | case elfcpp::R_X86_64_PC16: | |
1637 | case elfcpp::R_X86_64_PC8: | |
1638 | break; | |
1639 | ||
f389a824 ILT |
1640 | case elfcpp::R_X86_64_PLT32: |
1641 | // Since we know this is a local symbol, we can handle this as a | |
1642 | // PC32 reloc. | |
1643 | break; | |
1644 | ||
fdc2f80f | 1645 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1646 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1647 | case elfcpp::R_X86_64_GOTPC64: |
1648 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1649 | // We need a GOT section. |
1650 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1651 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1652 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1653 | break; |
1654 | ||
0ffd9845 ILT |
1655 | case elfcpp::R_X86_64_GOT64: |
1656 | case elfcpp::R_X86_64_GOT32: | |
1657 | case elfcpp::R_X86_64_GOTPCREL64: | |
1658 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1659 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1660 | { |
1661 | // The symbol requires a GOT entry. | |
1662 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1663 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
7223e9ca ILT |
1664 | |
1665 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1666 | // lets function pointers compare correctly with shared | |
1667 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1668 | bool is_new; | |
1669 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1670 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1671 | else | |
1672 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1673 | if (is_new) | |
0ffd9845 ILT |
1674 | { |
1675 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1676 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1677 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1678 | { |
1679 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1680 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1681 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
1682 | { |
1683 | unsigned int got_offset = | |
1684 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1685 | rela_dyn->add_local_relative(object, r_sym, | |
1686 | elfcpp::R_X86_64_RELATIVE, | |
1687 | got, got_offset, 0); | |
1688 | } | |
7bf1f802 | 1689 | else |
dceae3c1 | 1690 | { |
a036edd8 ILT |
1691 | this->check_non_pic(object, r_type); |
1692 | ||
dceae3c1 | 1693 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1694 | rela_dyn->add_local( |
1695 | object, r_sym, r_type, got, | |
1696 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1697 | } |
0ffd9845 ILT |
1698 | } |
1699 | } | |
ee9e9e86 ILT |
1700 | // For GOTPLT64, we'd normally want a PLT section, but since |
1701 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1702 | } |
1703 | break; | |
1704 | ||
2e30d253 ILT |
1705 | case elfcpp::R_X86_64_COPY: |
1706 | case elfcpp::R_X86_64_GLOB_DAT: | |
1707 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1708 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1709 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 1710 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1711 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1712 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1713 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1714 | gold_error(_("%s: unexpected reloc %u in object file"), |
1715 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1716 | break; |
1717 | ||
d61c17ea | 1718 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1719 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1720 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1721 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1722 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1723 | case elfcpp::R_X86_64_DTPOFF32: |
1724 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1725 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1726 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1727 | { |
8851ecca | 1728 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1729 | const tls::Tls_optimization optimized_type |
1730 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1731 | switch (r_type) |
1732 | { | |
56622147 | 1733 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1734 | if (optimized_type == tls::TLSOPT_NONE) |
1735 | { | |
1736 | // Create a pair of GOT entries for the module index and | |
1737 | // dtv-relative offset. | |
1738 | Output_data_got<64, false>* got | |
1739 | = target->got_section(symtab, layout); | |
1740 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1741 | unsigned int shndx = lsym.get_st_shndx(); |
1742 | bool is_ordinary; | |
1743 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1744 | if (!is_ordinary) | |
1745 | object->error(_("local symbol %u has bad shndx %u"), | |
1746 | r_sym, shndx); | |
1747 | else | |
1748 | got->add_local_pair_with_rela(object, r_sym, | |
1749 | shndx, | |
1750 | GOT_TYPE_TLS_PAIR, | |
1751 | target->rela_dyn_section(layout), | |
1752 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1753 | } |
1754 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1755 | unsupported_reloc_local(object, r_type); | |
1756 | break; | |
1757 | ||
56622147 | 1758 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1759 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1760 | if (optimized_type == tls::TLSOPT_NONE) |
1761 | { | |
1762 | // Create reserved PLT and GOT entries for the resolver. | |
1763 | target->reserve_tlsdesc_entries(symtab, layout); | |
1764 | ||
a8df5856 ILT |
1765 | // Generate a double GOT entry with an |
1766 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
1767 | // is resolved lazily, so the GOT entry needs to be in | |
1768 | // an area in .got.plt, not .got. Call got_section to | |
1769 | // make sure the section has been created. | |
1770 | target->got_section(symtab, layout); | |
1771 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1772 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
e291e7b9 ILT |
1773 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1774 | { | |
1775 | unsigned int got_offset = got->add_constant(0); | |
1776 | got->add_constant(0); | |
1777 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1778 | got_offset); | |
1779 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
1780 | // We store the arguments we need in a vector, and | |
1781 | // use the index into the vector as the parameter | |
1782 | // to pass to the target specific routines. | |
1783 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
1784 | void* arg = reinterpret_cast<void*>(intarg); | |
1785 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1786 | got, got_offset, 0); | |
1787 | } | |
c2b45e22 CC |
1788 | } |
1789 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1790 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1791 | break; |
1792 | ||
c2b45e22 CC |
1793 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1794 | break; | |
1795 | ||
e041f13d | 1796 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1797 | if (optimized_type == tls::TLSOPT_NONE) |
1798 | { | |
1799 | // Create a GOT entry for the module index. | |
31d60480 | 1800 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1801 | } |
1802 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1803 | unsupported_reloc_local(object, r_type); | |
1804 | break; | |
1805 | ||
0ffd9845 ILT |
1806 | case elfcpp::R_X86_64_DTPOFF32: |
1807 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1808 | break; |
1809 | ||
56622147 | 1810 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1811 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1812 | if (optimized_type == tls::TLSOPT_NONE) |
1813 | { | |
1814 | // Create a GOT entry for the tp-relative offset. | |
1815 | Output_data_got<64, false>* got | |
1816 | = target->got_section(symtab, layout); | |
1817 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1818 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1819 | target->rela_dyn_section(layout), |
1820 | elfcpp::R_X86_64_TPOFF64); | |
1821 | } | |
1822 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1823 | unsupported_reloc_local(object, r_type); |
1824 | break; | |
0ffd9845 | 1825 | |
56622147 | 1826 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1827 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1828 | if (output_is_shared) |
1829 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1830 | break; |
e041f13d ILT |
1831 | |
1832 | default: | |
1833 | gold_unreachable(); | |
2e30d253 ILT |
1834 | } |
1835 | } | |
1836 | break; | |
2e30d253 | 1837 | |
fdc2f80f ILT |
1838 | case elfcpp::R_X86_64_SIZE32: |
1839 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1840 | default: |
75f2446e ILT |
1841 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1842 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1843 | break; |
1844 | } | |
1845 | } | |
1846 | ||
1847 | ||
e041f13d ILT |
1848 | // Report an unsupported relocation against a global symbol. |
1849 | ||
1850 | void | |
1851 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1852 | unsigned int r_type, | |
1853 | Symbol* gsym) | |
1854 | { | |
75f2446e | 1855 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1856 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1857 | } |
1858 | ||
ce97fa81 | 1859 | // Returns true if this relocation type could be that of a function pointer. |
21bb3914 ST |
1860 | inline bool |
1861 | Target_x86_64::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1862 | { | |
21bb3914 ST |
1863 | switch (r_type) |
1864 | { | |
1865 | case elfcpp::R_X86_64_64: | |
1866 | case elfcpp::R_X86_64_32: | |
1867 | case elfcpp::R_X86_64_32S: | |
1868 | case elfcpp::R_X86_64_16: | |
1869 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
1870 | case elfcpp::R_X86_64_GOT64: |
1871 | case elfcpp::R_X86_64_GOT32: | |
1872 | case elfcpp::R_X86_64_GOTPCREL64: | |
1873 | case elfcpp::R_X86_64_GOTPCREL: | |
1874 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
1875 | { |
1876 | return true; | |
1877 | } | |
1878 | } | |
1879 | return false; | |
1880 | } | |
1881 | ||
1882 | // For safe ICF, scan a relocation for a local symbol to check if it | |
1883 | // corresponds to a function pointer being taken. In that case mark | |
1884 | // the function whose pointer was taken as not foldable. | |
1885 | ||
1886 | inline bool | |
1887 | Target_x86_64::Scan::local_reloc_may_be_function_pointer( | |
1888 | Symbol_table* , | |
1889 | Layout* , | |
1890 | Target_x86_64* , | |
1891 | Sized_relobj<64, false>* , | |
1892 | unsigned int , | |
1893 | Output_section* , | |
1894 | const elfcpp::Rela<64, false>& , | |
1895 | unsigned int r_type, | |
1896 | const elfcpp::Sym<64, false>&) | |
1897 | { | |
1898 | // When building a shared library, do not fold any local symbols as it is | |
1899 | // not possible to distinguish pointer taken versus a call by looking at | |
1900 | // the relocation types. | |
1901 | return (parameters->options().shared() | |
1902 | || possible_function_pointer_reloc(r_type)); | |
1903 | } | |
1904 | ||
1905 | // For safe ICF, scan a relocation for a global symbol to check if it | |
1906 | // corresponds to a function pointer being taken. In that case mark | |
1907 | // the function whose pointer was taken as not foldable. | |
1908 | ||
1909 | inline bool | |
1910 | Target_x86_64::Scan::global_reloc_may_be_function_pointer( | |
1911 | Symbol_table*, | |
1912 | Layout* , | |
1913 | Target_x86_64* , | |
1914 | Sized_relobj<64, false>* , | |
1915 | unsigned int , | |
1916 | Output_section* , | |
1917 | const elfcpp::Rela<64, false>& , | |
1918 | unsigned int r_type, | |
1919 | Symbol* gsym) | |
1920 | { | |
1921 | // When building a shared library, do not fold symbols whose visibility | |
1922 | // is hidden, internal or protected. | |
1923 | return ((parameters->options().shared() | |
1924 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
1925 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
1926 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
1927 | || possible_function_pointer_reloc(r_type)); | |
1928 | } | |
1929 | ||
2e30d253 ILT |
1930 | // Scan a relocation for a global symbol. |
1931 | ||
1932 | inline void | |
ad0f2072 | 1933 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1934 | Layout* layout, |
1935 | Target_x86_64* target, | |
1936 | Sized_relobj<64, false>* object, | |
1937 | unsigned int data_shndx, | |
4f4c5f80 | 1938 | Output_section* output_section, |
d61c17ea ILT |
1939 | const elfcpp::Rela<64, false>& reloc, |
1940 | unsigned int r_type, | |
1941 | Symbol* gsym) | |
2e30d253 | 1942 | { |
7223e9ca ILT |
1943 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1944 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1945 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1946 | target->make_plt_entry(symtab, layout, gsym); | |
1947 | ||
2e30d253 ILT |
1948 | switch (r_type) |
1949 | { | |
1950 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1951 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1952 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1953 | break; |
1954 | ||
1955 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1956 | case elfcpp::R_X86_64_32: |
1957 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1958 | case elfcpp::R_X86_64_16: |
2e30d253 | 1959 | case elfcpp::R_X86_64_8: |
96f2030e | 1960 | { |
d61c6bd4 ILT |
1961 | // Make a PLT entry if necessary. |
1962 | if (gsym->needs_plt_entry()) | |
1963 | { | |
1964 | target->make_plt_entry(symtab, layout, gsym); | |
1965 | // Since this is not a PC-relative relocation, we may be | |
1966 | // taking the address of a function. In that case we need to | |
1967 | // set the entry in the dynamic symbol table to the address of | |
1968 | // the PLT entry. | |
8851ecca | 1969 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1970 | gsym->set_needs_dynsym_value(); |
1971 | } | |
1972 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1973 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1974 | { |
966d4097 | 1975 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1976 | { |
12c0daef | 1977 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1978 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1979 | } |
7223e9ca ILT |
1980 | else if (r_type == elfcpp::R_X86_64_64 |
1981 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1982 | && gsym->can_use_relative_reloc(false) | |
1983 | && !gsym->is_from_dynobj() | |
1984 | && !gsym->is_undefined() | |
1985 | && !gsym->is_preemptible()) | |
1986 | { | |
1987 | // Use an IRELATIVE reloc for a locally defined | |
1988 | // STT_GNU_IFUNC symbol. This makes a function | |
1989 | // address in a PIE executable match the address in a | |
1990 | // shared library that it links against. | |
1991 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1992 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; | |
1993 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
1994 | output_section, object, | |
1995 | data_shndx, | |
1996 | reloc.get_r_offset(), | |
1997 | reloc.get_r_addend()); | |
1998 | } | |
d61c6bd4 ILT |
1999 | else if (r_type == elfcpp::R_X86_64_64 |
2000 | && gsym->can_use_relative_reloc(false)) | |
2001 | { | |
2002 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2003 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
2004 | output_section, object, | |
2005 | data_shndx, | |
2006 | reloc.get_r_offset(), | |
2007 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
2008 | } |
2009 | else | |
2010 | { | |
a036edd8 | 2011 | this->check_non_pic(object, r_type); |
96f2030e | 2012 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
2013 | rela_dyn->add_global(gsym, r_type, output_section, object, |
2014 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 2015 | reloc.get_r_addend()); |
d61c6bd4 ILT |
2016 | } |
2017 | } | |
2018 | } | |
2019 | break; | |
2020 | ||
2021 | case elfcpp::R_X86_64_PC64: | |
2022 | case elfcpp::R_X86_64_PC32: | |
2023 | case elfcpp::R_X86_64_PC16: | |
2024 | case elfcpp::R_X86_64_PC8: | |
2025 | { | |
2026 | // Make a PLT entry if necessary. | |
2027 | if (gsym->needs_plt_entry()) | |
2028 | target->make_plt_entry(symtab, layout, gsym); | |
2029 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 2030 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
86849f1f | 2031 | { |
966d4097 | 2032 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 2033 | { |
12c0daef | 2034 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 2035 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 2036 | } |
86849f1f | 2037 | else |
d61c6bd4 | 2038 | { |
a036edd8 | 2039 | this->check_non_pic(object, r_type); |
d61c6bd4 | 2040 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
2041 | rela_dyn->add_global(gsym, r_type, output_section, object, |
2042 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
2043 | reloc.get_r_addend()); |
2044 | } | |
86849f1f | 2045 | } |
d61c6bd4 | 2046 | } |
2e30d253 ILT |
2047 | break; |
2048 | ||
ff006520 | 2049 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 2050 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
2051 | case elfcpp::R_X86_64_GOTPCREL64: |
2052 | case elfcpp::R_X86_64_GOTPCREL: | |
2053 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
2054 | { |
2055 | // The symbol requires a GOT entry. | |
2056 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 2057 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2058 | { |
2059 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2060 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2061 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2062 | else | |
2063 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2064 | } | |
7bf1f802 ILT |
2065 | else |
2066 | { | |
2e30d253 ILT |
2067 | // If this symbol is not fully resolved, we need to add a |
2068 | // dynamic relocation for it. | |
7bf1f802 | 2069 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
2070 | if (gsym->is_from_dynobj() |
2071 | || gsym->is_undefined() | |
2072 | || gsym->is_preemptible() | |
2073 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2074 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 | 2075 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
2076 | elfcpp::R_X86_64_GLOB_DAT); |
2077 | else | |
2e30d253 | 2078 | { |
7223e9ca ILT |
2079 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2080 | // offset into the GOT, so that function pointer | |
2081 | // comparisons work correctly. | |
2082 | bool is_new; | |
2083 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2084 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2085 | else | |
2086 | { | |
2087 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2088 | // Tell the dynamic linker to use the PLT address | |
2089 | // when resolving relocations. | |
2090 | if (gsym->is_from_dynobj() | |
2091 | && !parameters->options().shared()) | |
2092 | gsym->set_needs_dynsym_value(); | |
2093 | } | |
2094 | if (is_new) | |
2095 | { | |
2096 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2097 | rela_dyn->add_global_relative(gsym, | |
2098 | elfcpp::R_X86_64_RELATIVE, | |
2099 | got, got_off, 0); | |
2100 | } | |
2e30d253 ILT |
2101 | } |
2102 | } | |
ee9e9e86 ILT |
2103 | // For GOTPLT64, we also need a PLT entry (but only if the |
2104 | // symbol is not fully resolved). | |
2105 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
2106 | && !gsym->final_value_is_known()) | |
2107 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2108 | } |
2109 | break; | |
2110 | ||
2111 | case elfcpp::R_X86_64_PLT32: | |
2112 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
2113 | // Otherwise we need a PLT entry. | |
2114 | if (gsym->final_value_is_known()) | |
2115 | break; | |
96f2030e ILT |
2116 | // If building a shared library, we can also skip the PLT entry |
2117 | // if the symbol is defined in the output file and is protected | |
2118 | // or hidden. | |
2119 | if (gsym->is_defined() | |
2120 | && !gsym->is_from_dynobj() | |
2121 | && !gsym->is_preemptible()) | |
2122 | break; | |
2e30d253 ILT |
2123 | target->make_plt_entry(symtab, layout, gsym); |
2124 | break; | |
2125 | ||
fdc2f80f | 2126 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2127 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2128 | case elfcpp::R_X86_64_GOTPC64: |
2129 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2130 | // We need a GOT section. |
2131 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2132 | // For PLTOFF64, we also need a PLT entry (but only if the |
2133 | // symbol is not fully resolved). | |
2134 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
2135 | && !gsym->final_value_is_known()) | |
2136 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2137 | break; |
2138 | ||
2e30d253 ILT |
2139 | case elfcpp::R_X86_64_COPY: |
2140 | case elfcpp::R_X86_64_GLOB_DAT: | |
2141 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2142 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2143 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2144 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 2145 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2146 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 2147 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2148 | gold_error(_("%s: unexpected reloc %u in object file"), |
2149 | object->name().c_str(), r_type); | |
2e30d253 | 2150 | break; |
2e30d253 | 2151 | |
d61c17ea | 2152 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
2153 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2154 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2155 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2156 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2157 | case elfcpp::R_X86_64_DTPOFF32: |
2158 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2159 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2160 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
2161 | { |
2162 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
2163 | const tls::Tls_optimization optimized_type |
2164 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
2165 | switch (r_type) |
2166 | { | |
56622147 | 2167 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
2168 | if (optimized_type == tls::TLSOPT_NONE) |
2169 | { | |
2170 | // Create a pair of GOT entries for the module index and | |
2171 | // dtv-relative offset. | |
2172 | Output_data_got<64, false>* got | |
2173 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
2174 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
2175 | target->rela_dyn_section(layout), | |
2176 | elfcpp::R_X86_64_DTPMOD64, | |
2177 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
2178 | } |
2179 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2180 | { | |
2181 | // Create a GOT entry for the tp-relative offset. | |
2182 | Output_data_got<64, false>* got | |
2183 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2184 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
2185 | target->rela_dyn_section(layout), |
2186 | elfcpp::R_X86_64_TPOFF64); | |
2187 | } | |
2188 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2189 | unsupported_reloc_global(object, r_type, gsym); | |
2190 | break; | |
2191 | ||
56622147 | 2192 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 2193 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2194 | if (optimized_type == tls::TLSOPT_NONE) |
2195 | { | |
2196 | // Create reserved PLT and GOT entries for the resolver. | |
2197 | target->reserve_tlsdesc_entries(symtab, layout); | |
2198 | ||
a8df5856 ILT |
2199 | // Create a double GOT entry with an R_X86_64_TLSDESC |
2200 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
2201 | // lazily, so the GOT entry needs to be in an area in | |
2202 | // .got.plt, not .got. Call got_section to make sure | |
2203 | // the section has been created. | |
2204 | target->got_section(symtab, layout); | |
2205 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
ca09d69a | 2206 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
e291e7b9 | 2207 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, rt, |
c2b45e22 CC |
2208 | elfcpp::R_X86_64_TLSDESC, 0); |
2209 | } | |
2210 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2211 | { | |
2212 | // Create a GOT entry for the tp-relative offset. | |
2213 | Output_data_got<64, false>* got | |
2214 | = target->got_section(symtab, layout); | |
2215 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
2216 | target->rela_dyn_section(layout), | |
2217 | elfcpp::R_X86_64_TPOFF64); | |
2218 | } | |
2219 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2220 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
2221 | break; |
2222 | ||
c2b45e22 CC |
2223 | case elfcpp::R_X86_64_TLSDESC_CALL: |
2224 | break; | |
2225 | ||
e041f13d | 2226 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2227 | if (optimized_type == tls::TLSOPT_NONE) |
2228 | { | |
2229 | // Create a GOT entry for the module index. | |
31d60480 | 2230 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
2231 | } |
2232 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2233 | unsupported_reloc_global(object, r_type, gsym); | |
2234 | break; | |
2235 | ||
0ffd9845 ILT |
2236 | case elfcpp::R_X86_64_DTPOFF32: |
2237 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2238 | break; |
2239 | ||
56622147 | 2240 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2241 | layout->set_has_static_tls(); |
7bf1f802 ILT |
2242 | if (optimized_type == tls::TLSOPT_NONE) |
2243 | { | |
2244 | // Create a GOT entry for the tp-relative offset. | |
2245 | Output_data_got<64, false>* got | |
2246 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2247 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
2248 | target->rela_dyn_section(layout), |
2249 | elfcpp::R_X86_64_TPOFF64); | |
2250 | } | |
2251 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
2252 | unsupported_reloc_global(object, r_type, gsym); |
2253 | break; | |
0ffd9845 | 2254 | |
56622147 | 2255 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2256 | layout->set_has_static_tls(); |
8851ecca | 2257 | if (parameters->options().shared()) |
7bf1f802 | 2258 | unsupported_reloc_local(object, r_type); |
2e30d253 | 2259 | break; |
e041f13d ILT |
2260 | |
2261 | default: | |
2262 | gold_unreachable(); | |
2e30d253 ILT |
2263 | } |
2264 | } | |
2265 | break; | |
fdc2f80f ILT |
2266 | |
2267 | case elfcpp::R_X86_64_SIZE32: | |
2268 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2269 | default: |
75f2446e | 2270 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
2271 | object->name().c_str(), r_type, |
2272 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
2273 | break; |
2274 | } | |
2275 | } | |
2276 | ||
6d03d481 | 2277 | void |
ad0f2072 | 2278 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
2279 | Layout* layout, |
2280 | Sized_relobj<64, false>* object, | |
2281 | unsigned int data_shndx, | |
2282 | unsigned int sh_type, | |
2283 | const unsigned char* prelocs, | |
2284 | size_t reloc_count, | |
2285 | Output_section* output_section, | |
2286 | bool needs_special_offset_handling, | |
2287 | size_t local_symbol_count, | |
2288 | const unsigned char* plocal_symbols) | |
2289 | { | |
2290 | ||
2291 | if (sh_type == elfcpp::SHT_REL) | |
2292 | { | |
2293 | return; | |
2294 | } | |
2295 | ||
2296 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
41cbeecc ST |
2297 | Target_x86_64::Scan, |
2298 | Target_x86_64::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2299 | symtab, |
2300 | layout, | |
2301 | this, | |
2302 | object, | |
2303 | data_shndx, | |
2304 | prelocs, | |
2305 | reloc_count, | |
2306 | output_section, | |
2307 | needs_special_offset_handling, | |
2308 | local_symbol_count, | |
2309 | plocal_symbols); | |
2310 | ||
2311 | } | |
2e30d253 ILT |
2312 | // Scan relocations for a section. |
2313 | ||
2314 | void | |
ad0f2072 | 2315 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
2316 | Layout* layout, |
2317 | Sized_relobj<64, false>* object, | |
2318 | unsigned int data_shndx, | |
2319 | unsigned int sh_type, | |
2320 | const unsigned char* prelocs, | |
2321 | size_t reloc_count, | |
730cdc88 ILT |
2322 | Output_section* output_section, |
2323 | bool needs_special_offset_handling, | |
d61c17ea | 2324 | size_t local_symbol_count, |
730cdc88 | 2325 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
2326 | { |
2327 | if (sh_type == elfcpp::SHT_REL) | |
2328 | { | |
75f2446e ILT |
2329 | gold_error(_("%s: unsupported REL reloc section"), |
2330 | object->name().c_str()); | |
2331 | return; | |
2e30d253 ILT |
2332 | } |
2333 | ||
2334 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2335 | Target_x86_64::Scan>( | |
2e30d253 ILT |
2336 | symtab, |
2337 | layout, | |
2338 | this, | |
2339 | object, | |
2340 | data_shndx, | |
2341 | prelocs, | |
2342 | reloc_count, | |
730cdc88 ILT |
2343 | output_section, |
2344 | needs_special_offset_handling, | |
2e30d253 | 2345 | local_symbol_count, |
730cdc88 | 2346 | plocal_symbols); |
2e30d253 ILT |
2347 | } |
2348 | ||
2349 | // Finalize the sections. | |
2350 | ||
2351 | void | |
f59f41f3 DK |
2352 | Target_x86_64::do_finalize_sections( |
2353 | Layout* layout, | |
2354 | const Input_objects*, | |
e785ec03 | 2355 | Symbol_table* symtab) |
2e30d253 | 2356 | { |
ea715a34 ILT |
2357 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2358 | ? NULL | |
e291e7b9 | 2359 | : this->plt_->rela_plt()); |
ea715a34 | 2360 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 2361 | this->rela_dyn_, true, false); |
ea715a34 | 2362 | |
2e30d253 ILT |
2363 | // Fill in some more dynamic tags. |
2364 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
2365 | if (odyn != NULL) | |
2366 | { | |
22b127cc | 2367 | if (this->plt_ != NULL |
ea715a34 ILT |
2368 | && this->plt_->output_section() != NULL |
2369 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 2370 | { |
ea715a34 ILT |
2371 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
2372 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
2373 | this->got_->finalize_data_size(); | |
2374 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
2375 | this->plt_, plt_offset); | |
2376 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
2377 | this->got_, got_offset); | |
2e30d253 ILT |
2378 | } |
2379 | } | |
2380 | ||
2381 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2382 | // relocs. | |
12c0daef ILT |
2383 | if (this->copy_relocs_.any_saved_relocs()) |
2384 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
2385 | |
2386 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2387 | // the .got.plt section. | |
2388 | Symbol* sym = this->global_offset_table_; | |
2389 | if (sym != NULL) | |
2390 | { | |
2391 | uint64_t data_size = this->got_plt_->current_data_size(); | |
2392 | symtab->get_sized_symbol<64>(sym)->set_symsize(data_size); | |
2393 | } | |
2e30d253 ILT |
2394 | } |
2395 | ||
2396 | // Perform a relocation. | |
2397 | ||
2398 | inline bool | |
2399 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
2400 | Target_x86_64* target, | |
031cdbed | 2401 | Output_section*, |
2e30d253 | 2402 | size_t relnum, |
0ffd9845 | 2403 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
2404 | unsigned int r_type, |
2405 | const Sized_symbol<64>* gsym, | |
2406 | const Symbol_value<64>* psymval, | |
2407 | unsigned char* view, | |
2408 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2409 | section_size_type view_size) |
2e30d253 ILT |
2410 | { |
2411 | if (this->skip_call_tls_get_addr_) | |
2412 | { | |
5efc7cd2 CC |
2413 | if ((r_type != elfcpp::R_X86_64_PLT32 |
2414 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 2415 | || gsym == NULL |
0ffd9845 | 2416 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 2417 | { |
75f2446e ILT |
2418 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2419 | _("missing expected TLS relocation")); | |
2420 | } | |
2421 | else | |
2422 | { | |
2423 | this->skip_call_tls_get_addr_ = false; | |
2424 | return false; | |
2e30d253 | 2425 | } |
2e30d253 ILT |
2426 | } |
2427 | ||
7223e9ca ILT |
2428 | const Sized_relobj<64, false>* object = relinfo->object; |
2429 | ||
2430 | // Pick the value to use for symbols defined in the PLT. | |
2e30d253 | 2431 | Symbol_value<64> symval; |
96f2030e | 2432 | if (gsym != NULL |
95a2c8d6 | 2433 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 ILT |
2434 | { |
2435 | symval.set_output_value(target->plt_section()->address() | |
2436 | + gsym->plt_offset()); | |
2437 | psymval = &symval; | |
2438 | } | |
7223e9ca ILT |
2439 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2440 | { | |
2441 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2442 | if (object->local_has_plt_offset(r_sym)) | |
2443 | { | |
2444 | symval.set_output_value(target->plt_section()->address() | |
2445 | + object->local_plt_offset(r_sym)); | |
2446 | psymval = &symval; | |
2447 | } | |
2448 | } | |
2e30d253 | 2449 | |
0ffd9845 ILT |
2450 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2451 | ||
2452 | // Get the GOT offset if needed. | |
96f2030e ILT |
2453 | // The GOT pointer points to the end of the GOT section. |
2454 | // We need to subtract the size of the GOT section to get | |
2455 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
2456 | bool have_got_offset = false; |
2457 | unsigned int got_offset = 0; | |
2458 | switch (r_type) | |
2459 | { | |
2460 | case elfcpp::R_X86_64_GOT32: | |
2461 | case elfcpp::R_X86_64_GOT64: | |
2462 | case elfcpp::R_X86_64_GOTPLT64: | |
2463 | case elfcpp::R_X86_64_GOTPCREL: | |
2464 | case elfcpp::R_X86_64_GOTPCREL64: | |
2465 | if (gsym != NULL) | |
2466 | { | |
0a65a3a7 CC |
2467 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2468 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
2469 | } |
2470 | else | |
2471 | { | |
2472 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2473 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2474 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2475 | - target->got_size()); | |
0ffd9845 ILT |
2476 | } |
2477 | have_got_offset = true; | |
2478 | break; | |
2479 | ||
2480 | default: | |
2481 | break; | |
2482 | } | |
2e30d253 ILT |
2483 | |
2484 | switch (r_type) | |
2485 | { | |
2486 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2487 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2488 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2489 | break; |
2490 | ||
2491 | case elfcpp::R_X86_64_64: | |
2492 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
2493 | break; | |
2494 | ||
2495 | case elfcpp::R_X86_64_PC64: | |
2496 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
2497 | address); | |
2498 | break; | |
2499 | ||
2500 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
2501 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2502 | // uint64_t x = value + addend; | |
2503 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
2504 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
2505 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2506 | break; | |
2507 | ||
2508 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
2509 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2510 | // int64_t x = value + addend; // note this quantity is signed! | |
2511 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
2512 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2513 | break; | |
2514 | ||
2515 | case elfcpp::R_X86_64_PC32: | |
2516 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
2517 | address); | |
2518 | break; | |
2519 | ||
2520 | case elfcpp::R_X86_64_16: | |
2521 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
2522 | break; | |
2523 | ||
2524 | case elfcpp::R_X86_64_PC16: | |
2525 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
2526 | address); | |
2527 | break; | |
2528 | ||
2529 | case elfcpp::R_X86_64_8: | |
2530 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
2531 | break; | |
2532 | ||
2533 | case elfcpp::R_X86_64_PC8: | |
2534 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
2535 | address); | |
2536 | break; | |
2537 | ||
2538 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
2539 | gold_assert(gsym == NULL |
2540 | || gsym->has_plt_offset() | |
99f8faca ILT |
2541 | || gsym->final_value_is_known() |
2542 | || (gsym->is_defined() | |
2543 | && !gsym->is_from_dynobj() | |
2544 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
2545 | // Note: while this code looks the same as for R_X86_64_PC32, it |
2546 | // behaves differently because psymval was set to point to | |
2547 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
2548 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
2549 | address); | |
2550 | break; | |
2551 | ||
ee9e9e86 ILT |
2552 | case elfcpp::R_X86_64_PLTOFF64: |
2553 | { | |
2554 | gold_assert(gsym); | |
2555 | gold_assert(gsym->has_plt_offset() | |
2556 | || gsym->final_value_is_known()); | |
2557 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
2558 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
2559 | Relocate_functions<64, false>::rela64(view, object, psymval, |
2560 | addend - got_address); | |
ee9e9e86 ILT |
2561 | } |
2562 | ||
2e30d253 | 2563 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
2564 | gold_assert(have_got_offset); |
2565 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
2566 | break; |
2567 | ||
e822f2b1 ILT |
2568 | case elfcpp::R_X86_64_GOTPC32: |
2569 | { | |
2570 | gold_assert(gsym); | |
2571 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2572 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2573 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2574 | } | |
2575 | break; | |
2576 | ||
2577 | case elfcpp::R_X86_64_GOT64: | |
2578 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
2579 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 2580 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2581 | gold_assert(have_got_offset); |
2582 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
2583 | break; |
2584 | ||
2585 | case elfcpp::R_X86_64_GOTPC64: | |
2586 | { | |
2587 | gold_assert(gsym); | |
2588 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2589 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2590 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
2591 | } | |
2592 | break; | |
2593 | ||
2e30d253 ILT |
2594 | case elfcpp::R_X86_64_GOTOFF64: |
2595 | { | |
2596 | elfcpp::Elf_types<64>::Elf_Addr value; | |
2597 | value = (psymval->value(object, 0) | |
96f2030e | 2598 | - target->got_plt_section()->address()); |
2e30d253 ILT |
2599 | Relocate_functions<64, false>::rela64(view, value, addend); |
2600 | } | |
2601 | break; | |
2602 | ||
2603 | case elfcpp::R_X86_64_GOTPCREL: | |
2604 | { | |
0ffd9845 ILT |
2605 | gold_assert(have_got_offset); |
2606 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2607 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2608 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
2609 | } |
2610 | break; | |
2611 | ||
e822f2b1 ILT |
2612 | case elfcpp::R_X86_64_GOTPCREL64: |
2613 | { | |
0ffd9845 ILT |
2614 | gold_assert(have_got_offset); |
2615 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2616 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2617 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
2618 | } |
2619 | break; | |
2620 | ||
2e30d253 ILT |
2621 | case elfcpp::R_X86_64_COPY: |
2622 | case elfcpp::R_X86_64_GLOB_DAT: | |
2623 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2624 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2625 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2626 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2627 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2628 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2629 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2630 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2631 | _("unexpected reloc %u in object file"), | |
2632 | r_type); | |
2e30d253 ILT |
2633 | break; |
2634 | ||
d61c17ea | 2635 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2636 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2637 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2638 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2639 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2640 | case elfcpp::R_X86_64_DTPOFF32: |
2641 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2642 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2643 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
2644 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2645 | view, address, view_size); | |
2e30d253 | 2646 | break; |
2e30d253 | 2647 | |
fdc2f80f ILT |
2648 | case elfcpp::R_X86_64_SIZE32: |
2649 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2650 | default: |
75f2446e ILT |
2651 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2652 | _("unsupported reloc %u"), | |
2653 | r_type); | |
2e30d253 ILT |
2654 | break; |
2655 | } | |
2656 | ||
2657 | return true; | |
2658 | } | |
2659 | ||
2660 | // Perform a TLS relocation. | |
2661 | ||
2662 | inline void | |
d61c17ea | 2663 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 2664 | Target_x86_64* target, |
d61c17ea | 2665 | size_t relnum, |
72ec2876 | 2666 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2667 | unsigned int r_type, |
2668 | const Sized_symbol<64>* gsym, | |
2669 | const Symbol_value<64>* psymval, | |
2670 | unsigned char* view, | |
6a41d30b | 2671 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2672 | section_size_type view_size) |
2e30d253 | 2673 | { |
2e30d253 | 2674 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
2675 | |
2676 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 2677 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
36171d64 CC |
2678 | elfcpp::Shdr<64, false> data_shdr(relinfo->data_shdr); |
2679 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; | |
2e30d253 ILT |
2680 | |
2681 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
2682 | ||
2683 | const bool is_final = (gsym == NULL | |
b3705d2a | 2684 | ? !parameters->options().shared() |
2e30d253 | 2685 | : gsym->final_value_is_known()); |
36171d64 | 2686 | tls::Tls_optimization optimized_type |
e041f13d | 2687 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2688 | switch (r_type) |
2689 | { | |
56622147 | 2690 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
2691 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2692 | { | |
2693 | // If this code sequence is used in a non-executable section, | |
2694 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
2695 | // on the assumption that it's being used by itself in a debug | |
2696 | // section. Therefore, in the unlikely event that the code | |
2697 | // sequence appears in a non-executable section, we simply | |
2698 | // leave it unoptimized. | |
2699 | optimized_type = tls::TLSOPT_NONE; | |
2700 | } | |
e041f13d | 2701 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 2702 | { |
7bf1f802 | 2703 | gold_assert(tls_segment != NULL); |
2e30d253 | 2704 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 2705 | rela, r_type, value, view, |
2e30d253 ILT |
2706 | view_size); |
2707 | break; | |
2708 | } | |
7bf1f802 ILT |
2709 | else |
2710 | { | |
c2b45e22 CC |
2711 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2712 | ? GOT_TYPE_TLS_OFFSET | |
2713 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2714 | unsigned int got_offset; |
2715 | if (gsym != NULL) | |
2716 | { | |
c2b45e22 CC |
2717 | gold_assert(gsym->has_got_offset(got_type)); |
2718 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2719 | } |
2720 | else | |
2721 | { | |
2722 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2723 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2724 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2725 | - target->got_size()); |
2726 | } | |
2727 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2728 | { | |
2729 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2730 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2731 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2732 | value, view, address, view_size); |
7bf1f802 ILT |
2733 | break; |
2734 | } | |
2735 | else if (optimized_type == tls::TLSOPT_NONE) | |
2736 | { | |
2737 | // Relocate the field with the offset of the pair of GOT | |
2738 | // entries. | |
6a41d30b ILT |
2739 | value = target->got_plt_section()->address() + got_offset; |
2740 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2741 | address); | |
7bf1f802 ILT |
2742 | break; |
2743 | } | |
2744 | } | |
72ec2876 | 2745 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2746 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2747 | break; |
2748 | ||
c2b45e22 CC |
2749 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2750 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
2751 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2752 | { | |
2753 | // See above comment for R_X86_64_TLSGD. | |
2754 | optimized_type = tls::TLSOPT_NONE; | |
2755 | } | |
c2b45e22 CC |
2756 | if (optimized_type == tls::TLSOPT_TO_LE) |
2757 | { | |
2758 | gold_assert(tls_segment != NULL); | |
2759 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2760 | rela, r_type, value, view, | |
2761 | view_size); | |
2762 | break; | |
2763 | } | |
2764 | else | |
2765 | { | |
2766 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2767 | ? GOT_TYPE_TLS_OFFSET | |
2768 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2769 | unsigned int got_offset = 0; |
2770 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC | |
2771 | && optimized_type == tls::TLSOPT_NONE) | |
2772 | { | |
2773 | // We created GOT entries in the .got.tlsdesc portion of | |
2774 | // the .got.plt section, but the offset stored in the | |
2775 | // symbol is the offset within .got.tlsdesc. | |
2776 | got_offset = (target->got_size() | |
2777 | + target->got_plt_section()->data_size()); | |
2778 | } | |
c2b45e22 CC |
2779 | if (gsym != NULL) |
2780 | { | |
2781 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2782 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2783 | } |
2784 | else | |
2785 | { | |
2786 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2787 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2788 | got_offset += (object->local_got_offset(r_sym, got_type) |
2789 | - target->got_size()); | |
c2b45e22 CC |
2790 | } |
2791 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2792 | { | |
2793 | gold_assert(tls_segment != NULL); | |
2794 | value = target->got_plt_section()->address() + got_offset; | |
2795 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2796 | rela, r_type, value, view, address, | |
2797 | view_size); | |
2798 | break; | |
2799 | } | |
2800 | else if (optimized_type == tls::TLSOPT_NONE) | |
2801 | { | |
2802 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2803 | { | |
2804 | // Relocate the field with the offset of the pair of GOT | |
2805 | // entries. | |
2806 | value = target->got_plt_section()->address() + got_offset; | |
2807 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2808 | address); | |
2809 | } | |
2810 | break; | |
2811 | } | |
2812 | } | |
2813 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2814 | _("unsupported reloc %u"), r_type); | |
2815 | break; | |
2816 | ||
56622147 | 2817 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
2818 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2819 | { | |
2820 | // See above comment for R_X86_64_TLSGD. | |
2821 | optimized_type = tls::TLSOPT_NONE; | |
2822 | } | |
e041f13d ILT |
2823 | if (optimized_type == tls::TLSOPT_TO_LE) |
2824 | { | |
7bf1f802 | 2825 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2826 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2827 | value, view, view_size); | |
2828 | break; | |
e041f13d | 2829 | } |
7bf1f802 ILT |
2830 | else if (optimized_type == tls::TLSOPT_NONE) |
2831 | { | |
2832 | // Relocate the field with the offset of the GOT entry for | |
2833 | // the module index. | |
2834 | unsigned int got_offset; | |
31d60480 ILT |
2835 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2836 | - target->got_size()); | |
6a41d30b ILT |
2837 | value = target->got_plt_section()->address() + got_offset; |
2838 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2839 | address); | |
7bf1f802 ILT |
2840 | break; |
2841 | } | |
72ec2876 | 2842 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2843 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2844 | break; |
0ffd9845 ILT |
2845 | |
2846 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
2847 | // This relocation type is used in debugging information. |
2848 | // In that case we need to not optimize the value. If the | |
2849 | // section is not executable, then we assume we should not | |
2850 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
2851 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
2852 | // R_X86_64_TLSLD. | |
2853 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
2854 | { | |
2855 | gold_assert(tls_segment != NULL); | |
2856 | value -= tls_segment->memsz(); | |
2857 | } | |
d85c80a3 | 2858 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2859 | break; |
2860 | ||
2861 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
2862 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
2863 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
2864 | { | |
2865 | gold_assert(tls_segment != NULL); | |
2866 | value -= tls_segment->memsz(); | |
2867 | } | |
d85c80a3 | 2868 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2869 | break; |
2e30d253 | 2870 | |
56622147 ILT |
2871 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2872 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2873 | { | |
7bf1f802 | 2874 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2875 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2876 | rela, r_type, value, view, | |
2877 | view_size); | |
2878 | break; | |
2879 | } | |
7bf1f802 ILT |
2880 | else if (optimized_type == tls::TLSOPT_NONE) |
2881 | { | |
2882 | // Relocate the field with the offset of the GOT entry for | |
2883 | // the tp-relative offset of the symbol. | |
2884 | unsigned int got_offset; | |
2885 | if (gsym != NULL) | |
2886 | { | |
0a65a3a7 CC |
2887 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2888 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2889 | - target->got_size()); | |
7bf1f802 ILT |
2890 | } |
2891 | else | |
2892 | { | |
2893 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2894 | gold_assert(object->local_has_got_offset(r_sym, |
2895 | GOT_TYPE_TLS_OFFSET)); | |
2896 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2897 | - target->got_size()); |
2898 | } | |
6a41d30b ILT |
2899 | value = target->got_plt_section()->address() + got_offset; |
2900 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2901 | break; |
2902 | } | |
56622147 ILT |
2903 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2904 | _("unsupported reloc type %u"), | |
2905 | r_type); | |
2906 | break; | |
0ffd9845 | 2907 | |
56622147 | 2908 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2909 | value -= tls_segment->memsz(); |
d85c80a3 | 2910 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2911 | break; |
2e30d253 | 2912 | } |
2e30d253 ILT |
2913 | } |
2914 | ||
7bf1f802 ILT |
2915 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2916 | // Initial-Exec. | |
2917 | ||
2918 | inline void | |
2919 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2920 | size_t relnum, | |
c2b45e22 | 2921 | Output_segment*, |
7bf1f802 ILT |
2922 | const elfcpp::Rela<64, false>& rela, |
2923 | unsigned int, | |
2924 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2925 | unsigned char* view, | |
c2b45e22 | 2926 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2927 | section_size_type view_size) |
7bf1f802 ILT |
2928 | { |
2929 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2930 | // .word 0x6666; rex64; call __tls_get_addr | |
2931 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2932 | ||
2933 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2934 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2935 | ||
2936 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2937 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2938 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2939 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2940 | ||
2941 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2942 | ||
c2b45e22 CC |
2943 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2944 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2945 | |
2946 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2947 | // We can skip it. | |
2948 | this->skip_call_tls_get_addr_ = true; | |
2949 | } | |
2950 | ||
e041f13d | 2951 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2952 | // Local-Exec. |
2953 | ||
2954 | inline void | |
d61c17ea ILT |
2955 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2956 | size_t relnum, | |
2957 | Output_segment* tls_segment, | |
72ec2876 | 2958 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2959 | unsigned int, |
2960 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2961 | unsigned char* view, | |
fe8718a4 | 2962 | section_size_type view_size) |
2e30d253 | 2963 | { |
0ffd9845 ILT |
2964 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2965 | // .word 0x6666; rex64; call __tls_get_addr | |
2966 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2967 | |
72ec2876 ILT |
2968 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2969 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2970 | |
72ec2876 ILT |
2971 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2972 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2973 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2974 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2975 | |
0ffd9845 | 2976 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2977 | |
6a41d30b | 2978 | value -= tls_segment->memsz(); |
0ffd9845 | 2979 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2980 | |
2981 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2982 | // We can skip it. | |
2983 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2984 | } |
2985 | ||
c2b45e22 CC |
2986 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2987 | ||
2988 | inline void | |
2989 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2990 | const Relocate_info<64, false>* relinfo, | |
2991 | size_t relnum, | |
2992 | Output_segment*, | |
2993 | const elfcpp::Rela<64, false>& rela, | |
2994 | unsigned int r_type, | |
2995 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2996 | unsigned char* view, | |
2997 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2998 | section_size_type view_size) | |
2999 | { | |
3000 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3001 | { | |
3002 | // leaq foo@tlsdesc(%rip), %rax | |
3003 | // ==> movq foo@gottpoff(%rip), %rax | |
3004 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3005 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3006 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3007 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
3008 | view[-2] = 0x8b; | |
3009 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
3010 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
3011 | } | |
3012 | else | |
3013 | { | |
3014 | // call *foo@tlscall(%rax) | |
3015 | // ==> nop; nop | |
3016 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3017 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3018 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3019 | view[0] == 0xff && view[1] == 0x10); | |
3020 | view[0] = 0x66; | |
3021 | view[1] = 0x90; | |
3022 | } | |
3023 | } | |
3024 | ||
3025 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
3026 | ||
3027 | inline void | |
3028 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
3029 | const Relocate_info<64, false>* relinfo, | |
3030 | size_t relnum, | |
3031 | Output_segment* tls_segment, | |
3032 | const elfcpp::Rela<64, false>& rela, | |
3033 | unsigned int r_type, | |
3034 | elfcpp::Elf_types<64>::Elf_Addr value, | |
3035 | unsigned char* view, | |
3036 | section_size_type view_size) | |
3037 | { | |
3038 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3039 | { | |
3040 | // leaq foo@tlsdesc(%rip), %rax | |
3041 | // ==> movq foo@tpoff, %rax | |
3042 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3043 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3044 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3045 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
3046 | view[-2] = 0xc7; | |
3047 | view[-1] = 0xc0; | |
3048 | value -= tls_segment->memsz(); | |
3049 | Relocate_functions<64, false>::rela32(view, value, 0); | |
3050 | } | |
3051 | else | |
3052 | { | |
3053 | // call *foo@tlscall(%rax) | |
3054 | // ==> nop; nop | |
3055 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3056 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3057 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3058 | view[0] == 0xff && view[1] == 0x10); | |
3059 | view[0] = 0x66; | |
3060 | view[1] = 0x90; | |
3061 | } | |
3062 | } | |
3063 | ||
2e30d253 | 3064 | inline void |
72ec2876 ILT |
3065 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
3066 | size_t relnum, | |
3067 | Output_segment*, | |
3068 | const elfcpp::Rela<64, false>& rela, | |
3069 | unsigned int, | |
3070 | elfcpp::Elf_types<64>::Elf_Addr, | |
3071 | unsigned char* view, | |
fe8718a4 | 3072 | section_size_type view_size) |
2e30d253 | 3073 | { |
72ec2876 ILT |
3074 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
3075 | // ... leq foo@dtpoff(%rax),%reg | |
3076 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 3077 | |
72ec2876 ILT |
3078 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
3079 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 3080 | |
72ec2876 ILT |
3081 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
3082 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
3083 | ||
3084 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
3085 | ||
3086 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
3087 | ||
3088 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3089 | // We can skip it. | |
3090 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3091 | } |
3092 | ||
56622147 ILT |
3093 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3094 | // Local-Exec. | |
3095 | ||
3096 | inline void | |
3097 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
3098 | size_t relnum, | |
3099 | Output_segment* tls_segment, | |
3100 | const elfcpp::Rela<64, false>& rela, | |
3101 | unsigned int, | |
3102 | elfcpp::Elf_types<64>::Elf_Addr value, | |
3103 | unsigned char* view, | |
fe8718a4 | 3104 | section_size_type view_size) |
56622147 ILT |
3105 | { |
3106 | // We need to examine the opcodes to figure out which instruction we | |
3107 | // are looking at. | |
3108 | ||
3109 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
3110 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
3111 | ||
3112 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3113 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3114 | ||
3115 | unsigned char op1 = view[-3]; | |
3116 | unsigned char op2 = view[-2]; | |
3117 | unsigned char op3 = view[-1]; | |
3118 | unsigned char reg = op3 >> 3; | |
3119 | ||
3120 | if (op2 == 0x8b) | |
3121 | { | |
3122 | // movq | |
3123 | if (op1 == 0x4c) | |
3124 | view[-3] = 0x49; | |
3125 | view[-2] = 0xc7; | |
3126 | view[-1] = 0xc0 | reg; | |
3127 | } | |
3128 | else if (reg == 4) | |
3129 | { | |
3130 | // Special handling for %rsp. | |
3131 | if (op1 == 0x4c) | |
3132 | view[-3] = 0x49; | |
3133 | view[-2] = 0x81; | |
3134 | view[-1] = 0xc0 | reg; | |
3135 | } | |
3136 | else | |
3137 | { | |
3138 | // addq | |
3139 | if (op1 == 0x4c) | |
3140 | view[-3] = 0x4d; | |
3141 | view[-2] = 0x8d; | |
3142 | view[-1] = 0x80 | reg | (reg << 3); | |
3143 | } | |
3144 | ||
6a41d30b | 3145 | value -= tls_segment->memsz(); |
56622147 ILT |
3146 | Relocate_functions<64, false>::rela32(view, value, 0); |
3147 | } | |
3148 | ||
2e30d253 ILT |
3149 | // Relocate section data. |
3150 | ||
3151 | void | |
364c7fa5 ILT |
3152 | Target_x86_64::relocate_section( |
3153 | const Relocate_info<64, false>* relinfo, | |
3154 | unsigned int sh_type, | |
3155 | const unsigned char* prelocs, | |
3156 | size_t reloc_count, | |
3157 | Output_section* output_section, | |
3158 | bool needs_special_offset_handling, | |
3159 | unsigned char* view, | |
3160 | elfcpp::Elf_types<64>::Elf_Addr address, | |
3161 | section_size_type view_size, | |
3162 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
3163 | { |
3164 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3165 | ||
3166 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
3167 | Target_x86_64::Relocate>( | |
3168 | relinfo, | |
3169 | this, | |
3170 | prelocs, | |
3171 | reloc_count, | |
730cdc88 ILT |
3172 | output_section, |
3173 | needs_special_offset_handling, | |
2e30d253 ILT |
3174 | view, |
3175 | address, | |
364c7fa5 ILT |
3176 | view_size, |
3177 | reloc_symbol_changes); | |
2e30d253 ILT |
3178 | } |
3179 | ||
94a3fc8b CC |
3180 | // Apply an incremental relocation. Incremental relocations always refer |
3181 | // to global symbols. | |
3182 | ||
3183 | void | |
3184 | Target_x86_64::apply_relocation( | |
3185 | const Relocate_info<64, false>* relinfo, | |
3186 | elfcpp::Elf_types<64>::Elf_Addr r_offset, | |
3187 | unsigned int r_type, | |
3188 | elfcpp::Elf_types<64>::Elf_Swxword r_addend, | |
3189 | const Symbol* gsym, | |
3190 | unsigned char* view, | |
3191 | elfcpp::Elf_types<64>::Elf_Addr address, | |
3192 | section_size_type view_size) | |
3193 | { | |
3194 | gold::apply_relocation<64, false, Target_x86_64, Target_x86_64::Relocate>( | |
3195 | relinfo, | |
3196 | this, | |
3197 | r_offset, | |
3198 | r_type, | |
3199 | r_addend, | |
3200 | gsym, | |
3201 | view, | |
3202 | address, | |
3203 | view_size); | |
3204 | } | |
3205 | ||
6a74a719 ILT |
3206 | // Return the size of a relocation while scanning during a relocatable |
3207 | // link. | |
3208 | ||
3209 | unsigned int | |
3210 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
3211 | unsigned int r_type, | |
3212 | Relobj* object) | |
3213 | { | |
3214 | switch (r_type) | |
3215 | { | |
3216 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3217 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3218 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
3219 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3220 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
3221 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
3222 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
3223 | case elfcpp::R_X86_64_DTPOFF32: | |
3224 | case elfcpp::R_X86_64_DTPOFF64: | |
3225 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
3226 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
3227 | return 0; | |
3228 | ||
3229 | case elfcpp::R_X86_64_64: | |
3230 | case elfcpp::R_X86_64_PC64: | |
3231 | case elfcpp::R_X86_64_GOTOFF64: | |
3232 | case elfcpp::R_X86_64_GOTPC64: | |
3233 | case elfcpp::R_X86_64_PLTOFF64: | |
3234 | case elfcpp::R_X86_64_GOT64: | |
3235 | case elfcpp::R_X86_64_GOTPCREL64: | |
3236 | case elfcpp::R_X86_64_GOTPCREL: | |
3237 | case elfcpp::R_X86_64_GOTPLT64: | |
3238 | return 8; | |
3239 | ||
3240 | case elfcpp::R_X86_64_32: | |
3241 | case elfcpp::R_X86_64_32S: | |
3242 | case elfcpp::R_X86_64_PC32: | |
3243 | case elfcpp::R_X86_64_PLT32: | |
3244 | case elfcpp::R_X86_64_GOTPC32: | |
3245 | case elfcpp::R_X86_64_GOT32: | |
3246 | return 4; | |
3247 | ||
3248 | case elfcpp::R_X86_64_16: | |
3249 | case elfcpp::R_X86_64_PC16: | |
3250 | return 2; | |
3251 | ||
3252 | case elfcpp::R_X86_64_8: | |
3253 | case elfcpp::R_X86_64_PC8: | |
3254 | return 1; | |
3255 | ||
3256 | case elfcpp::R_X86_64_COPY: | |
3257 | case elfcpp::R_X86_64_GLOB_DAT: | |
3258 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3259 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3260 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
3261 | // These are outstanding tls relocs, which are unexpected when linking |
3262 | case elfcpp::R_X86_64_TPOFF64: | |
3263 | case elfcpp::R_X86_64_DTPMOD64: | |
3264 | case elfcpp::R_X86_64_TLSDESC: | |
3265 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3266 | return 0; | |
3267 | ||
3268 | case elfcpp::R_X86_64_SIZE32: | |
3269 | case elfcpp::R_X86_64_SIZE64: | |
3270 | default: | |
3271 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
3272 | return 0; | |
3273 | } | |
3274 | } | |
3275 | ||
3276 | // Scan the relocs during a relocatable link. | |
3277 | ||
3278 | void | |
ad0f2072 | 3279 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
3280 | Layout* layout, |
3281 | Sized_relobj<64, false>* object, | |
3282 | unsigned int data_shndx, | |
3283 | unsigned int sh_type, | |
3284 | const unsigned char* prelocs, | |
3285 | size_t reloc_count, | |
3286 | Output_section* output_section, | |
3287 | bool needs_special_offset_handling, | |
3288 | size_t local_symbol_count, | |
3289 | const unsigned char* plocal_symbols, | |
3290 | Relocatable_relocs* rr) | |
3291 | { | |
3292 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3293 | ||
3294 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
3295 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3296 | ||
7019cd25 | 3297 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 3298 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3299 | symtab, |
3300 | layout, | |
3301 | object, | |
3302 | data_shndx, | |
3303 | prelocs, | |
3304 | reloc_count, | |
3305 | output_section, | |
3306 | needs_special_offset_handling, | |
3307 | local_symbol_count, | |
3308 | plocal_symbols, | |
3309 | rr); | |
3310 | } | |
3311 | ||
3312 | // Relocate a section during a relocatable link. | |
3313 | ||
3314 | void | |
3315 | Target_x86_64::relocate_for_relocatable( | |
3316 | const Relocate_info<64, false>* relinfo, | |
3317 | unsigned int sh_type, | |
3318 | const unsigned char* prelocs, | |
3319 | size_t reloc_count, | |
3320 | Output_section* output_section, | |
3321 | off_t offset_in_output_section, | |
3322 | const Relocatable_relocs* rr, | |
3323 | unsigned char* view, | |
3324 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
3325 | section_size_type view_size, | |
3326 | unsigned char* reloc_view, | |
3327 | section_size_type reloc_view_size) | |
3328 | { | |
3329 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3330 | ||
7019cd25 | 3331 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
3332 | relinfo, |
3333 | prelocs, | |
3334 | reloc_count, | |
3335 | output_section, | |
3336 | offset_in_output_section, | |
3337 | rr, | |
3338 | view, | |
3339 | view_address, | |
3340 | view_size, | |
3341 | reloc_view, | |
3342 | reloc_view_size); | |
3343 | } | |
3344 | ||
4fb6c25d ILT |
3345 | // Return the value to use for a dynamic which requires special |
3346 | // treatment. This is how we support equality comparisons of function | |
3347 | // pointers across shared library boundaries, as described in the | |
3348 | // processor specific ABI supplement. | |
3349 | ||
3350 | uint64_t | |
3351 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
3352 | { | |
3353 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3354 | return this->plt_section()->address() + gsym->plt_offset(); | |
3355 | } | |
3356 | ||
2e30d253 ILT |
3357 | // Return a string used to fill a code section with nops to take up |
3358 | // the specified length. | |
3359 | ||
3360 | std::string | |
8851ecca | 3361 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
3362 | { |
3363 | if (length >= 16) | |
3364 | { | |
3365 | // Build a jmpq instruction to skip over the bytes. | |
3366 | unsigned char jmp[5]; | |
3367 | jmp[0] = 0xe9; | |
04bf7072 | 3368 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
3369 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
3370 | + std::string(length - 5, '\0')); | |
3371 | } | |
3372 | ||
3373 | // Nop sequences of various lengths. | |
3374 | const char nop1[1] = { 0x90 }; // nop | |
3375 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
3376 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
3377 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
3378 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
3379 | 0x00 }; | |
3380 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 3381 | 0x00, 0x00 }; |
1caf2c51 | 3382 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 3383 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3384 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
3385 | 0x00, 0x00, 0x00, 0x00 }; | |
3386 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
3387 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 3388 | 0x00 }; |
1caf2c51 ILT |
3389 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
3390 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 3391 | 0x00, 0x00 }; |
1caf2c51 ILT |
3392 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
3393 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3394 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3395 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
3396 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3397 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3398 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3399 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
3400 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 3401 | 0x00 }; |
1caf2c51 ILT |
3402 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3403 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
3404 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3405 | 0x00, 0x00 }; |
1caf2c51 ILT |
3406 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3407 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
3408 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
3409 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
3410 | |
3411 | const char* nops[16] = { | |
3412 | NULL, | |
3413 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3414 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3415 | }; | |
3416 | ||
3417 | return std::string(nops[length], length); | |
3418 | } | |
3419 | ||
e291e7b9 ILT |
3420 | // Return the addend to use for a target specific relocation. The |
3421 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
3422 | // symbol. We want to set the addend is the offset of the local | |
3423 | // symbol in the TLS segment. | |
3424 | ||
3425 | uint64_t | |
3426 | Target_x86_64::do_reloc_addend(void* arg, unsigned int r_type, | |
3427 | uint64_t) const | |
3428 | { | |
3429 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
3430 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
3431 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
3432 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
3433 | const Symbol_value<64>* psymval = ti.object->local_symbol(ti.r_sym); | |
3434 | gold_assert(psymval->is_tls_symbol()); | |
3435 | // The value of a TLS symbol is the offset in the TLS segment. | |
3436 | return psymval->value(ti.object, 0); | |
3437 | } | |
3438 | ||
364c7fa5 | 3439 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 3440 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
3441 | // code. We have to change the function so that it always ensures |
3442 | // that it has enough stack space to run some random function. | |
3443 | ||
3444 | void | |
3445 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3446 | section_offset_type fnoffset, | |
3447 | section_size_type fnsize, | |
3448 | unsigned char* view, | |
3449 | section_size_type view_size, | |
3450 | std::string* from, | |
3451 | std::string* to) const | |
3452 | { | |
3453 | // The function starts with a comparison of the stack pointer and a | |
3454 | // field in the TCB. This is followed by a jump. | |
3455 | ||
3456 | // cmp %fs:NN,%rsp | |
3457 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
3458 | && fnsize > 9) | |
3459 | { | |
3460 | // We will call __morestack if the carry flag is set after this | |
3461 | // comparison. We turn the comparison into an stc instruction | |
3462 | // and some nops. | |
3463 | view[fnoffset] = '\xf9'; | |
3464 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
3465 | } | |
3466 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
3467 | // lea NN(%rsp),%r11 |
3468 | else if ((this->match_view(view, view_size, fnoffset, | |
3469 | "\x4c\x8d\x94\x24", 4) | |
3470 | || this->match_view(view, view_size, fnoffset, | |
3471 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
3472 | && fnsize > 8) |
3473 | { | |
3474 | // This is loading an offset from the stack pointer for a | |
3475 | // comparison. The offset is negative, so we decrease the | |
3476 | // offset by the amount of space we need for the stack. This | |
3477 | // means we will avoid calling __morestack if there happens to | |
3478 | // be plenty of space on the stack already. | |
3479 | unsigned char* pval = view + fnoffset + 4; | |
3480 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3481 | val -= parameters->options().split_stack_adjust_size(); | |
3482 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3483 | } | |
3484 | else | |
3485 | { | |
3486 | if (!object->has_no_split_stack()) | |
3487 | object->error(_("failed to match split-stack sequence at " | |
3488 | "section %u offset %0zx"), | |
ac33a407 | 3489 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3490 | return; |
3491 | } | |
3492 | ||
3493 | // We have to change the function so that it calls | |
3494 | // __morestack_non_split instead of __morestack. The former will | |
3495 | // allocate additional stack space. | |
3496 | *from = "__morestack"; | |
3497 | *to = "__morestack_non_split"; | |
3498 | } | |
3499 | ||
2e30d253 ILT |
3500 | // The selector for x86_64 object files. |
3501 | ||
36959681 | 3502 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
3503 | { |
3504 | public: | |
3505 | Target_selector_x86_64() | |
36959681 ILT |
3506 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
3507 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
3508 | { } |
3509 | ||
3510 | Target* | |
e96caa79 ILT |
3511 | do_instantiate_target() |
3512 | { return new Target_x86_64(); } | |
36959681 | 3513 | |
2e30d253 ILT |
3514 | }; |
3515 | ||
2e30d253 ILT |
3516 | Target_selector_x86_64 target_selector_x86_64; |
3517 | ||
3518 | } // End anonymous namespace. |