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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 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" | |
35 | #include "target.h" | |
36 | #include "target-reloc.h" | |
37 | #include "target-select.h" | |
e041f13d | 38 | #include "tls.h" |
2e30d253 ILT |
39 | |
40 | namespace | |
41 | { | |
42 | ||
43 | using namespace gold; | |
44 | ||
45 | class Output_data_plt_x86_64; | |
46 | ||
47 | // The x86_64 target class. | |
d61c17ea ILT |
48 | // See the ABI at |
49 | // http://www.x86-64.org/documentation/abi.pdf | |
50 | // TLS info comes from | |
51 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 52 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 ILT |
53 | |
54 | class Target_x86_64 : public Sized_target<64, false> | |
55 | { | |
56 | public: | |
e822f2b1 ILT |
57 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
58 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
59 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
60 | ||
61 | Target_x86_64() | |
62 | : Sized_target<64, false>(&x86_64_info), | |
0ffd9845 | 63 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
31d60480 | 64 | copy_relocs_(NULL), dynbss_(NULL), got_mod_index_offset_(-1U) |
2e30d253 ILT |
65 | { } |
66 | ||
67 | // Scan the relocations to look for symbol adjustments. | |
68 | void | |
69 | scan_relocs(const General_options& options, | |
70 | Symbol_table* symtab, | |
71 | Layout* layout, | |
72 | Sized_relobj<64, false>* object, | |
73 | unsigned int data_shndx, | |
74 | unsigned int sh_type, | |
75 | const unsigned char* prelocs, | |
76 | size_t reloc_count, | |
730cdc88 ILT |
77 | Output_section* output_section, |
78 | bool needs_special_offset_handling, | |
2e30d253 | 79 | size_t local_symbol_count, |
730cdc88 | 80 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
81 | |
82 | // Finalize the sections. | |
83 | void | |
84 | do_finalize_sections(Layout*); | |
85 | ||
4fb6c25d ILT |
86 | // Return the value to use for a dynamic which requires special |
87 | // treatment. | |
88 | uint64_t | |
89 | do_dynsym_value(const Symbol*) const; | |
90 | ||
2e30d253 ILT |
91 | // Relocate a section. |
92 | void | |
93 | relocate_section(const Relocate_info<64, false>*, | |
94 | unsigned int sh_type, | |
95 | const unsigned char* prelocs, | |
96 | size_t reloc_count, | |
730cdc88 ILT |
97 | Output_section* output_section, |
98 | bool needs_special_offset_handling, | |
2e30d253 ILT |
99 | unsigned char* view, |
100 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
fe8718a4 | 101 | section_size_type view_size); |
2e30d253 | 102 | |
6a74a719 ILT |
103 | // Scan the relocs during a relocatable link. |
104 | void | |
105 | scan_relocatable_relocs(const General_options& options, | |
106 | Symbol_table* symtab, | |
107 | Layout* layout, | |
108 | Sized_relobj<64, false>* object, | |
109 | unsigned int data_shndx, | |
110 | unsigned int sh_type, | |
111 | const unsigned char* prelocs, | |
112 | size_t reloc_count, | |
113 | Output_section* output_section, | |
114 | bool needs_special_offset_handling, | |
115 | size_t local_symbol_count, | |
116 | const unsigned char* plocal_symbols, | |
117 | Relocatable_relocs*); | |
118 | ||
119 | // Relocate a section during a relocatable link. | |
120 | void | |
121 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
122 | unsigned int sh_type, | |
123 | const unsigned char* prelocs, | |
124 | size_t reloc_count, | |
125 | Output_section* output_section, | |
126 | off_t offset_in_output_section, | |
127 | const Relocatable_relocs*, | |
128 | unsigned char* view, | |
129 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
130 | section_size_type view_size, | |
131 | unsigned char* reloc_view, | |
132 | section_size_type reloc_view_size); | |
133 | ||
2e30d253 ILT |
134 | // Return a string used to fill a code section with nops. |
135 | std::string | |
8851ecca | 136 | do_code_fill(section_size_type length) const; |
2e30d253 | 137 | |
9a2d6984 ILT |
138 | // Return whether SYM is defined by the ABI. |
139 | bool | |
140 | do_is_defined_by_abi(Symbol* sym) const | |
141 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
142 | ||
96f2030e | 143 | // Return the size of the GOT section. |
fe8718a4 | 144 | section_size_type |
96f2030e ILT |
145 | got_size() |
146 | { | |
147 | gold_assert(this->got_ != NULL); | |
148 | return this->got_->data_size(); | |
149 | } | |
150 | ||
2e30d253 ILT |
151 | private: |
152 | // The class which scans relocations. | |
153 | struct Scan | |
154 | { | |
155 | inline void | |
156 | local(const General_options& options, Symbol_table* symtab, | |
157 | Layout* layout, Target_x86_64* target, | |
158 | Sized_relobj<64, false>* object, | |
159 | unsigned int data_shndx, | |
07f397ab | 160 | Output_section* output_section, |
2e30d253 ILT |
161 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
162 | const elfcpp::Sym<64, false>& lsym); | |
163 | ||
164 | inline void | |
165 | global(const General_options& options, Symbol_table* symtab, | |
166 | Layout* layout, Target_x86_64* target, | |
167 | Sized_relobj<64, false>* object, | |
168 | unsigned int data_shndx, | |
07f397ab | 169 | Output_section* output_section, |
2e30d253 ILT |
170 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
171 | Symbol* gsym); | |
e041f13d ILT |
172 | |
173 | static void | |
174 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
175 | ||
176 | static void | |
177 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
178 | Symbol*); | |
2e30d253 ILT |
179 | }; |
180 | ||
181 | // The class which implements relocation. | |
182 | class Relocate | |
183 | { | |
184 | public: | |
185 | Relocate() | |
186 | : skip_call_tls_get_addr_(false) | |
187 | { } | |
188 | ||
189 | ~Relocate() | |
190 | { | |
191 | if (this->skip_call_tls_get_addr_) | |
192 | { | |
193 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 194 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
195 | } |
196 | } | |
197 | ||
198 | // Do a relocation. Return false if the caller should not issue | |
199 | // any warnings about this relocation. | |
200 | inline bool | |
201 | relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum, | |
202 | const elfcpp::Rela<64, false>&, | |
203 | unsigned int r_type, const Sized_symbol<64>*, | |
204 | const Symbol_value<64>*, | |
205 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 206 | section_size_type); |
2e30d253 ILT |
207 | |
208 | private: | |
209 | // Do a TLS relocation. | |
210 | inline void | |
7bf1f802 ILT |
211 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
212 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
213 | unsigned int r_type, const Sized_symbol<64>*, |
214 | const Symbol_value<64>*, | |
fe8718a4 ILT |
215 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
216 | section_size_type); | |
2e30d253 | 217 | |
7bf1f802 ILT |
218 | // Do a TLS General-Dynamic to Local-Exec transition. |
219 | inline void | |
220 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
221 | Output_segment* tls_segment, | |
222 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
223 | elfcpp::Elf_types<64>::Elf_Addr value, | |
224 | unsigned char* view, | |
fe8718a4 | 225 | section_size_type view_size); |
7bf1f802 | 226 | |
56622147 ILT |
227 | // Do a TLS General-Dynamic to Local-Exec transition. |
228 | inline void | |
229 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
230 | Output_segment* tls_segment, |
231 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
232 | elfcpp::Elf_types<64>::Elf_Addr value, | |
233 | unsigned char* view, | |
fe8718a4 | 234 | section_size_type view_size); |
2e30d253 | 235 | |
56622147 | 236 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 237 | inline void |
56622147 | 238 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
239 | Output_segment* tls_segment, |
240 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
241 | elfcpp::Elf_types<64>::Elf_Addr value, | |
242 | unsigned char* view, | |
fe8718a4 | 243 | section_size_type view_size); |
2e30d253 | 244 | |
56622147 ILT |
245 | // Do a TLS Initial-Exec to Local-Exec transition. |
246 | static inline void | |
247 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
248 | Output_segment* tls_segment, |
249 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
250 | elfcpp::Elf_types<64>::Elf_Addr value, | |
251 | unsigned char* view, | |
fe8718a4 | 252 | section_size_type view_size); |
2e30d253 ILT |
253 | |
254 | // This is set if we should skip the next reloc, which should be a | |
255 | // PLT32 reloc against ___tls_get_addr. | |
256 | bool skip_call_tls_get_addr_; | |
257 | }; | |
258 | ||
6a74a719 ILT |
259 | // A class which returns the size required for a relocation type, |
260 | // used while scanning relocs during a relocatable link. | |
261 | class Relocatable_size_for_reloc | |
262 | { | |
263 | public: | |
264 | unsigned int | |
265 | get_size_for_reloc(unsigned int, Relobj*); | |
266 | }; | |
267 | ||
2e30d253 ILT |
268 | // Adjust TLS relocation type based on the options and whether this |
269 | // is a local symbol. | |
e041f13d | 270 | static tls::Tls_optimization |
2e30d253 ILT |
271 | optimize_tls_reloc(bool is_final, int r_type); |
272 | ||
273 | // Get the GOT section, creating it if necessary. | |
274 | Output_data_got<64, false>* | |
275 | got_section(Symbol_table*, Layout*); | |
276 | ||
96f2030e ILT |
277 | // Get the GOT PLT section. |
278 | Output_data_space* | |
279 | got_plt_section() const | |
280 | { | |
281 | gold_assert(this->got_plt_ != NULL); | |
282 | return this->got_plt_; | |
283 | } | |
284 | ||
2e30d253 ILT |
285 | // Create a PLT entry for a global symbol. |
286 | void | |
287 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
288 | ||
31d60480 ILT |
289 | // Create a GOT entry for the TLS module index. |
290 | unsigned int | |
291 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
292 | Sized_relobj<64, false>* object); | |
293 | ||
2e30d253 ILT |
294 | // Get the PLT section. |
295 | Output_data_plt_x86_64* | |
296 | plt_section() const | |
297 | { | |
298 | gold_assert(this->plt_ != NULL); | |
299 | return this->plt_; | |
300 | } | |
301 | ||
302 | // Get the dynamic reloc section, creating it if necessary. | |
303 | Reloc_section* | |
0ffd9845 | 304 | rela_dyn_section(Layout*); |
2e30d253 | 305 | |
d61c6bd4 ILT |
306 | // Return true if the symbol may need a COPY relocation. |
307 | // References from an executable object to non-function symbols | |
308 | // defined in a dynamic object may need a COPY relocation. | |
309 | bool | |
310 | may_need_copy_reloc(Symbol* gsym) | |
311 | { | |
8851ecca | 312 | return (!parameters->options().shared() |
d61c6bd4 ILT |
313 | && gsym->is_from_dynobj() |
314 | && gsym->type() != elfcpp::STT_FUNC); | |
315 | } | |
316 | ||
2e30d253 ILT |
317 | // Copy a relocation against a global symbol. |
318 | void | |
319 | copy_reloc(const General_options*, Symbol_table*, Layout*, | |
320 | Sized_relobj<64, false>*, unsigned int, | |
4f4c5f80 | 321 | Output_section*, Symbol*, const elfcpp::Rela<64, false>&); |
2e30d253 ILT |
322 | |
323 | // Information about this specific target which we pass to the | |
324 | // general Target structure. | |
325 | static const Target::Target_info x86_64_info; | |
326 | ||
0a65a3a7 CC |
327 | enum Got_type |
328 | { | |
329 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
330 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
331 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
332 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
333 | }; | |
334 | ||
2e30d253 ILT |
335 | // The GOT section. |
336 | Output_data_got<64, false>* got_; | |
337 | // The PLT section. | |
338 | Output_data_plt_x86_64* plt_; | |
339 | // The GOT PLT section. | |
340 | Output_data_space* got_plt_; | |
341 | // The dynamic reloc section. | |
0ffd9845 | 342 | Reloc_section* rela_dyn_; |
2e30d253 ILT |
343 | // Relocs saved to avoid a COPY reloc. |
344 | Copy_relocs<64, false>* copy_relocs_; | |
345 | // Space for variables copied with a COPY reloc. | |
346 | Output_data_space* dynbss_; | |
31d60480 ILT |
347 | // Offset of the GOT entry for the TLS module index; |
348 | unsigned int got_mod_index_offset_; | |
2e30d253 ILT |
349 | }; |
350 | ||
351 | const Target::Target_info Target_x86_64::x86_64_info = | |
352 | { | |
353 | 64, // size | |
354 | false, // is_big_endian | |
355 | elfcpp::EM_X86_64, // machine_code | |
356 | false, // has_make_symbol | |
357 | false, // has_resolve | |
358 | true, // has_code_fill | |
35cdfc9a | 359 | true, // is_default_stack_executable |
2e30d253 | 360 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 361 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
362 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
363 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
364 | }; |
365 | ||
366 | // Get the GOT section, creating it if necessary. | |
367 | ||
368 | Output_data_got<64, false>* | |
369 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
370 | { | |
371 | if (this->got_ == NULL) | |
372 | { | |
373 | gold_assert(symtab != NULL && layout != NULL); | |
374 | ||
375 | this->got_ = new Output_data_got<64, false>(); | |
376 | ||
377 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
378 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
379 | this->got_); | |
380 | ||
381 | // The old GNU linker creates a .got.plt section. We just | |
382 | // create another set of data in the .got section. Note that we | |
383 | // always create a PLT if we create a GOT, although the PLT | |
384 | // might be empty. | |
2e30d253 ILT |
385 | this->got_plt_ = new Output_data_space(8); |
386 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
387 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
388 | this->got_plt_); | |
389 | ||
390 | // The first three entries are reserved. | |
27bc2bce | 391 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
392 | |
393 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 394 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
395 | this->got_plt_, |
396 | 0, 0, elfcpp::STT_OBJECT, | |
397 | elfcpp::STB_LOCAL, | |
398 | elfcpp::STV_HIDDEN, 0, | |
399 | false, false); | |
400 | } | |
401 | ||
402 | return this->got_; | |
403 | } | |
404 | ||
405 | // Get the dynamic reloc section, creating it if necessary. | |
406 | ||
407 | Target_x86_64::Reloc_section* | |
0ffd9845 | 408 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 409 | { |
0ffd9845 | 410 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
411 | { |
412 | gold_assert(layout != NULL); | |
0ffd9845 | 413 | this->rela_dyn_ = new Reloc_section(); |
2e30d253 | 414 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 415 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 416 | } |
0ffd9845 | 417 | return this->rela_dyn_; |
2e30d253 ILT |
418 | } |
419 | ||
420 | // A class to handle the PLT data. | |
421 | ||
422 | class Output_data_plt_x86_64 : public Output_section_data | |
423 | { | |
424 | public: | |
425 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
426 | ||
427 | Output_data_plt_x86_64(Layout*, Output_data_space*); | |
428 | ||
429 | // Add an entry to the PLT. | |
430 | void | |
431 | add_entry(Symbol* gsym); | |
432 | ||
433 | // Return the .rel.plt section data. | |
434 | const Reloc_section* | |
435 | rel_plt() const | |
436 | { return this->rel_; } | |
437 | ||
438 | protected: | |
439 | void | |
440 | do_adjust_output_section(Output_section* os); | |
441 | ||
442 | private: | |
443 | // The size of an entry in the PLT. | |
444 | static const int plt_entry_size = 16; | |
445 | ||
446 | // The first entry in the PLT. | |
447 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
448 | // procedure linkage table for both programs and shared objects." | |
449 | static unsigned char first_plt_entry[plt_entry_size]; | |
450 | ||
451 | // Other entries in the PLT for an executable. | |
452 | static unsigned char plt_entry[plt_entry_size]; | |
453 | ||
454 | // Set the final size. | |
455 | void | |
27bc2bce | 456 | set_final_data_size() |
2e30d253 ILT |
457 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
458 | ||
459 | // Write out the PLT data. | |
460 | void | |
461 | do_write(Output_file*); | |
462 | ||
463 | // The reloc section. | |
464 | Reloc_section* rel_; | |
465 | // The .got.plt section. | |
466 | Output_data_space* got_plt_; | |
467 | // The number of PLT entries. | |
468 | unsigned int count_; | |
469 | }; | |
470 | ||
471 | // Create the PLT section. The ordinary .got section is an argument, | |
472 | // since we need to refer to the start. We also create our own .got | |
473 | // section just for PLT entries. | |
474 | ||
475 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
476 | Output_data_space* got_plt) | |
2e30d253 ILT |
477 | : Output_section_data(8), got_plt_(got_plt), count_(0) |
478 | { | |
479 | this->rel_ = new Reloc_section(); | |
480 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
481 | elfcpp::SHF_ALLOC, this->rel_); | |
482 | } | |
483 | ||
484 | void | |
485 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
486 | { | |
487 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
488 | // linker, and so do we. | |
489 | os->set_entsize(4); | |
490 | } | |
491 | ||
492 | // Add an entry to the PLT. | |
493 | ||
494 | void | |
495 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
496 | { | |
497 | gold_assert(!gsym->has_plt_offset()); | |
498 | ||
499 | // Note that when setting the PLT offset we skip the initial | |
500 | // reserved PLT entry. | |
501 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
502 | ||
503 | ++this->count_; | |
504 | ||
fe8718a4 | 505 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
506 | |
507 | // Every PLT entry needs a GOT entry which points back to the PLT | |
508 | // entry (this will be changed by the dynamic linker, normally | |
509 | // lazily when the function is called). | |
27bc2bce | 510 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
511 | |
512 | // Every PLT entry needs a reloc. | |
513 | gsym->set_needs_dynsym_entry(); | |
514 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
515 | got_offset, 0); | |
516 | ||
517 | // Note that we don't need to save the symbol. The contents of the | |
518 | // PLT are independent of which symbols are used. The symbols only | |
519 | // appear in the relocations. | |
520 | } | |
521 | ||
522 | // The first entry in the PLT for an executable. | |
523 | ||
524 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
525 | { | |
526 | // From AMD64 ABI Draft 0.98, page 76 | |
527 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 528 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
529 | 0xff, 0x25, // jmp indirect |
530 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
531 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
532 | }; | |
533 | ||
534 | // Subsequent entries in the PLT for an executable. | |
535 | ||
536 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
537 | { | |
538 | // From AMD64 ABI Draft 0.98, page 76 | |
539 | 0xff, 0x25, // jmpq indirect | |
540 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
541 | 0x68, // pushq immediate | |
542 | 0, 0, 0, 0, // replaced with offset into relocation table | |
543 | 0xe9, // jmpq relative | |
544 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
545 | }; | |
546 | ||
547 | // Write out the PLT. This uses the hand-coded instructions above, | |
548 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
549 | ||
550 | void | |
551 | Output_data_plt_x86_64::do_write(Output_file* of) | |
552 | { | |
553 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
554 | const section_size_type oview_size = |
555 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
556 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
557 | ||
558 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
559 | const section_size_type got_size = |
560 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
561 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
562 | got_size); | |
563 | ||
564 | unsigned char* pov = oview; | |
565 | ||
566 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
567 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
568 | ||
569 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd ILT |
570 | // We do a jmp relative to the PC at the end of this instruction. |
571 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 8 | |
572 | - (plt_address + 6)); | |
573 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 16 | |
574 | - (plt_address + 12)); | |
2e30d253 ILT |
575 | pov += plt_entry_size; |
576 | ||
577 | unsigned char* got_pov = got_view; | |
578 | ||
579 | memset(got_pov, 0, 24); | |
580 | got_pov += 24; | |
581 | ||
582 | unsigned int plt_offset = plt_entry_size; | |
583 | unsigned int got_offset = 24; | |
584 | const unsigned int count = this->count_; | |
585 | for (unsigned int plt_index = 0; | |
586 | plt_index < count; | |
587 | ++plt_index, | |
588 | pov += plt_entry_size, | |
589 | got_pov += 8, | |
590 | plt_offset += plt_entry_size, | |
591 | got_offset += 8) | |
592 | { | |
593 | // Set and adjust the PLT entry itself. | |
594 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
595 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
596 | (got_address + got_offset | |
597 | - (plt_address + plt_offset | |
598 | + 6))); | |
2e30d253 ILT |
599 | |
600 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
601 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
602 | - (plt_offset + plt_entry_size)); | |
603 | ||
604 | // Set the entry in the GOT. | |
605 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
606 | } | |
607 | ||
fe8718a4 ILT |
608 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
609 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
610 | |
611 | of->write_output_view(offset, oview_size, oview); | |
612 | of->write_output_view(got_file_offset, got_size, got_view); | |
613 | } | |
614 | ||
615 | // Create a PLT entry for a global symbol. | |
616 | ||
617 | void | |
618 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
619 | Symbol* gsym) | |
620 | { | |
621 | if (gsym->has_plt_offset()) | |
622 | return; | |
623 | ||
624 | if (this->plt_ == NULL) | |
625 | { | |
626 | // Create the GOT sections first. | |
627 | this->got_section(symtab, layout); | |
628 | ||
629 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_plt_); | |
630 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
631 | (elfcpp::SHF_ALLOC | |
632 | | elfcpp::SHF_EXECINSTR), | |
633 | this->plt_); | |
634 | } | |
635 | ||
636 | this->plt_->add_entry(gsym); | |
637 | } | |
638 | ||
31d60480 ILT |
639 | // Create a GOT entry for the TLS module index. |
640 | ||
641 | unsigned int | |
642 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
643 | Sized_relobj<64, false>* object) | |
644 | { | |
645 | if (this->got_mod_index_offset_ == -1U) | |
646 | { | |
647 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
648 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
649 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
650 | unsigned int got_offset = got->add_constant(0); | |
651 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
652 | got_offset, 0); | |
653 | got->add_constant(0); | |
654 | this->got_mod_index_offset_ = got_offset; | |
655 | } | |
656 | return this->got_mod_index_offset_; | |
657 | } | |
658 | ||
2e30d253 ILT |
659 | // Handle a relocation against a non-function symbol defined in a |
660 | // dynamic object. The traditional way to handle this is to generate | |
661 | // a COPY relocation to copy the variable at runtime from the shared | |
662 | // object into the executable's data segment. However, this is | |
663 | // undesirable in general, as if the size of the object changes in the | |
664 | // dynamic object, the executable will no longer work correctly. If | |
665 | // this relocation is in a writable section, then we can create a | |
666 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
667 | // address at runtime. However, we do not want do that if the | |
668 | // relocation is in a read-only section, as it would prevent the | |
669 | // readonly segment from being shared. And if we have to eventually | |
670 | // generate a COPY reloc, then any dynamic relocations will be | |
671 | // useless. So this means that if this is a writable section, we need | |
672 | // to save the relocation until we see whether we have to create a | |
673 | // COPY relocation for this symbol for any other relocation. | |
674 | ||
675 | void | |
676 | Target_x86_64::copy_reloc(const General_options* options, | |
d61c17ea ILT |
677 | Symbol_table* symtab, |
678 | Layout* layout, | |
679 | Sized_relobj<64, false>* object, | |
4f4c5f80 ILT |
680 | unsigned int data_shndx, |
681 | Output_section* output_section, | |
682 | Symbol* gsym, | |
72ec2876 | 683 | const elfcpp::Rela<64, false>& rela) |
2e30d253 | 684 | { |
7d1a9ebb | 685 | Sized_symbol<64>* ssym = symtab->get_sized_symbol<64>(gsym); |
2e30d253 ILT |
686 | |
687 | if (!Copy_relocs<64, false>::need_copy_reloc(options, object, | |
688 | data_shndx, ssym)) | |
689 | { | |
690 | // So far we do not need a COPY reloc. Save this relocation. | |
691 | // If it turns out that we never need a COPY reloc for this | |
692 | // symbol, then we will emit the relocation. | |
693 | if (this->copy_relocs_ == NULL) | |
694 | this->copy_relocs_ = new Copy_relocs<64, false>(); | |
4f4c5f80 | 695 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rela); |
2e30d253 ILT |
696 | } |
697 | else | |
698 | { | |
699 | // Allocate space for this symbol in the .bss section. | |
700 | ||
701 | elfcpp::Elf_types<64>::Elf_WXword symsize = ssym->symsize(); | |
702 | ||
703 | // There is no defined way to determine the required alignment | |
704 | // of the symbol. We pick the alignment based on the size. We | |
705 | // set an arbitrary maximum of 256. | |
706 | unsigned int align; | |
707 | for (align = 1; align < 512; align <<= 1) | |
708 | if ((symsize & align) != 0) | |
709 | break; | |
710 | ||
711 | if (this->dynbss_ == NULL) | |
712 | { | |
713 | this->dynbss_ = new Output_data_space(align); | |
714 | layout->add_output_section_data(".bss", | |
715 | elfcpp::SHT_NOBITS, | |
716 | (elfcpp::SHF_ALLOC | |
717 | | elfcpp::SHF_WRITE), | |
718 | this->dynbss_); | |
719 | } | |
720 | ||
721 | Output_data_space* dynbss = this->dynbss_; | |
722 | ||
723 | if (align > dynbss->addralign()) | |
724 | dynbss->set_space_alignment(align); | |
725 | ||
fe8718a4 | 726 | section_size_type dynbss_size = dynbss->current_data_size(); |
2e30d253 | 727 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 728 | section_size_type offset = dynbss_size; |
27bc2bce | 729 | dynbss->set_current_data_size(dynbss_size + symsize); |
2e30d253 | 730 | |
9b07f471 | 731 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
2e30d253 ILT |
732 | |
733 | // Add the COPY reloc. | |
0ffd9845 ILT |
734 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
735 | rela_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0); | |
2e30d253 ILT |
736 | } |
737 | } | |
738 | ||
739 | ||
740 | // Optimize the TLS relocation type based on what we know about the | |
741 | // symbol. IS_FINAL is true if the final address of this symbol is | |
742 | // known at link time. | |
743 | ||
e041f13d | 744 | tls::Tls_optimization |
2e30d253 ILT |
745 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
746 | { | |
2e30d253 ILT |
747 | // If we are generating a shared library, then we can't do anything |
748 | // in the linker. | |
8851ecca | 749 | if (parameters->options().shared()) |
e041f13d | 750 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
751 | |
752 | switch (r_type) | |
753 | { | |
754 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
755 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
756 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
757 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
758 | // access. Since we know that we are generating an executable, |
759 | // we can convert this to Initial-Exec. If we also know that | |
760 | // this is a local symbol, we can further switch to Local-Exec. | |
761 | if (is_final) | |
e041f13d ILT |
762 | return tls::TLSOPT_TO_LE; |
763 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 764 | |
d61c17ea | 765 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
766 | // This is Local-Dynamic, which refers to a local symbol in the |
767 | // dynamic TLS block. Since we know that we generating an | |
768 | // executable, we can switch to Local-Exec. | |
e041f13d | 769 | return tls::TLSOPT_TO_LE; |
2e30d253 | 770 | |
0ffd9845 | 771 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
772 | case elfcpp::R_X86_64_DTPOFF64: |
773 | // Another Local-Dynamic reloc. | |
e041f13d | 774 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 775 | |
d61c17ea | 776 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
777 | // These are Initial-Exec relocs which get the thread offset |
778 | // from the GOT. If we know that we are linking against the | |
779 | // local symbol, we can switch to Local-Exec, which links the | |
780 | // thread offset into the instruction. | |
781 | if (is_final) | |
e041f13d ILT |
782 | return tls::TLSOPT_TO_LE; |
783 | return tls::TLSOPT_NONE; | |
2e30d253 | 784 | |
d61c17ea | 785 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
786 | // When we already have Local-Exec, there is nothing further we |
787 | // can do. | |
e041f13d | 788 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
789 | |
790 | default: | |
791 | gold_unreachable(); | |
792 | } | |
2e30d253 ILT |
793 | } |
794 | ||
e041f13d ILT |
795 | // Report an unsupported relocation against a local symbol. |
796 | ||
797 | void | |
798 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
799 | unsigned int r_type) | |
800 | { | |
75f2446e ILT |
801 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
802 | object->name().c_str(), r_type); | |
e041f13d ILT |
803 | } |
804 | ||
2e30d253 ILT |
805 | // Scan a relocation for a local symbol. |
806 | ||
807 | inline void | |
808 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
809 | Symbol_table* symtab, |
810 | Layout* layout, | |
811 | Target_x86_64* target, | |
812 | Sized_relobj<64, false>* object, | |
0ffd9845 | 813 | unsigned int data_shndx, |
4f4c5f80 | 814 | Output_section* output_section, |
0ffd9845 | 815 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 816 | unsigned int r_type, |
7bf1f802 | 817 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
818 | { |
819 | switch (r_type) | |
820 | { | |
821 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
822 | case elfcpp::R_386_GNU_VTINHERIT: |
823 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
824 | break; |
825 | ||
826 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 827 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
828 | // executable), we need to create a dynamic relocation for this |
829 | // location. The relocation applied at link time will apply the | |
830 | // link-time value, so we flag the location with an | |
831 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 832 | // relocate it easily. |
8851ecca | 833 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 834 | { |
e8c846c3 | 835 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 836 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
837 | rela_dyn->add_local_relative(object, r_sym, |
838 | elfcpp::R_X86_64_RELATIVE, | |
839 | output_section, data_shndx, | |
840 | reloc.get_r_offset(), | |
841 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
842 | } |
843 | break; | |
844 | ||
2e30d253 ILT |
845 | case elfcpp::R_X86_64_32: |
846 | case elfcpp::R_X86_64_32S: | |
847 | case elfcpp::R_X86_64_16: | |
848 | case elfcpp::R_X86_64_8: | |
96f2030e | 849 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
850 | // executable), we need to create a dynamic relocation for this |
851 | // location. We can't use an R_X86_64_RELATIVE relocation | |
852 | // because that is always a 64-bit relocation. | |
8851ecca | 853 | if (parameters->options().output_is_position_independent()) |
96f2030e | 854 | { |
96f2030e | 855 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
dceae3c1 ILT |
856 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
857 | { | |
858 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
859 | rela_dyn->add_local(object, r_sym, r_type, output_section, | |
860 | data_shndx, reloc.get_r_offset(), | |
861 | reloc.get_r_addend()); | |
862 | } | |
863 | else | |
864 | { | |
865 | gold_assert(lsym.get_st_value() == 0); | |
866 | rela_dyn->add_local_section(object, lsym.get_st_shndx(), | |
867 | r_type, output_section, | |
868 | data_shndx, reloc.get_r_offset(), | |
869 | reloc.get_r_addend()); | |
870 | } | |
96f2030e | 871 | } |
2e30d253 ILT |
872 | break; |
873 | ||
874 | case elfcpp::R_X86_64_PC64: | |
875 | case elfcpp::R_X86_64_PC32: | |
876 | case elfcpp::R_X86_64_PC16: | |
877 | case elfcpp::R_X86_64_PC8: | |
878 | break; | |
879 | ||
f389a824 ILT |
880 | case elfcpp::R_X86_64_PLT32: |
881 | // Since we know this is a local symbol, we can handle this as a | |
882 | // PC32 reloc. | |
883 | break; | |
884 | ||
fdc2f80f | 885 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 886 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
887 | case elfcpp::R_X86_64_GOTPC64: |
888 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
889 | // We need a GOT section. |
890 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
891 | // For PLTOFF64, we'd normally want a PLT section, but since we |
892 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
893 | break; |
894 | ||
0ffd9845 ILT |
895 | case elfcpp::R_X86_64_GOT64: |
896 | case elfcpp::R_X86_64_GOT32: | |
897 | case elfcpp::R_X86_64_GOTPCREL64: | |
898 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 899 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
900 | { |
901 | // The symbol requires a GOT entry. | |
902 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
903 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 904 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
905 | { |
906 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 907 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 908 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
909 | { |
910 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
911 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
912 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
913 | rela_dyn->add_local_relative( |
914 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
915 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 916 | else |
dceae3c1 ILT |
917 | { |
918 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
0a65a3a7 CC |
919 | rela_dyn->add_local( |
920 | object, r_sym, r_type, got, | |
921 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 922 | } |
0ffd9845 ILT |
923 | } |
924 | } | |
ee9e9e86 ILT |
925 | // For GOTPLT64, we'd normally want a PLT section, but since |
926 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
927 | } |
928 | break; | |
929 | ||
2e30d253 ILT |
930 | case elfcpp::R_X86_64_COPY: |
931 | case elfcpp::R_X86_64_GLOB_DAT: | |
932 | case elfcpp::R_X86_64_JUMP_SLOT: | |
933 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 934 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 935 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 936 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 937 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
938 | gold_error(_("%s: unexpected reloc %u in object file"), |
939 | object->name().c_str(), r_type); | |
2e30d253 ILT |
940 | break; |
941 | ||
d61c17ea | 942 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
943 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
944 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 945 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 946 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
947 | case elfcpp::R_X86_64_DTPOFF32: |
948 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
949 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
950 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 951 | { |
8851ecca | 952 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
953 | const tls::Tls_optimization optimized_type |
954 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
955 | switch (r_type) |
956 | { | |
56622147 | 957 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
958 | if (optimized_type == tls::TLSOPT_NONE) |
959 | { | |
960 | // Create a pair of GOT entries for the module index and | |
961 | // dtv-relative offset. | |
962 | Output_data_got<64, false>* got | |
963 | = target->got_section(symtab, layout); | |
964 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 CC |
965 | got->add_local_pair_with_rela(object, r_sym, |
966 | lsym.get_st_shndx(), | |
967 | GOT_TYPE_TLS_PAIR, | |
968 | target->rela_dyn_section(layout), | |
969 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
970 | } |
971 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
972 | unsupported_reloc_local(object, r_type); | |
973 | break; | |
974 | ||
56622147 ILT |
975 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
976 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
977 | // FIXME: If not relaxing to LE, we need to generate | |
7bf1f802 | 978 | // a GOT entry with a R_x86_64_TLSDESC reloc. |
56622147 ILT |
979 | if (optimized_type != tls::TLSOPT_TO_LE) |
980 | unsupported_reloc_local(object, r_type); | |
2e30d253 ILT |
981 | break; |
982 | ||
e041f13d | 983 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
984 | if (optimized_type == tls::TLSOPT_NONE) |
985 | { | |
986 | // Create a GOT entry for the module index. | |
31d60480 | 987 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
988 | } |
989 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
990 | unsupported_reloc_local(object, r_type); | |
991 | break; | |
992 | ||
0ffd9845 ILT |
993 | case elfcpp::R_X86_64_DTPOFF32: |
994 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
995 | break; |
996 | ||
56622147 | 997 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 998 | layout->set_has_static_tls(); |
7bf1f802 ILT |
999 | if (optimized_type == tls::TLSOPT_NONE) |
1000 | { | |
1001 | // Create a GOT entry for the tp-relative offset. | |
1002 | Output_data_got<64, false>* got | |
1003 | = target->got_section(symtab, layout); | |
1004 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1005 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1006 | target->rela_dyn_section(layout), |
1007 | elfcpp::R_X86_64_TPOFF64); | |
1008 | } | |
1009 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1010 | unsupported_reloc_local(object, r_type); |
1011 | break; | |
0ffd9845 | 1012 | |
56622147 | 1013 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1014 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1015 | if (output_is_shared) |
1016 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1017 | break; |
e041f13d ILT |
1018 | |
1019 | default: | |
1020 | gold_unreachable(); | |
2e30d253 ILT |
1021 | } |
1022 | } | |
1023 | break; | |
2e30d253 | 1024 | |
fdc2f80f ILT |
1025 | case elfcpp::R_X86_64_SIZE32: |
1026 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1027 | default: |
75f2446e ILT |
1028 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1029 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1030 | break; |
1031 | } | |
1032 | } | |
1033 | ||
1034 | ||
e041f13d ILT |
1035 | // Report an unsupported relocation against a global symbol. |
1036 | ||
1037 | void | |
1038 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1039 | unsigned int r_type, | |
1040 | Symbol* gsym) | |
1041 | { | |
75f2446e | 1042 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1043 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1044 | } |
1045 | ||
2e30d253 ILT |
1046 | // Scan a relocation for a global symbol. |
1047 | ||
1048 | inline void | |
1049 | Target_x86_64::Scan::global(const General_options& options, | |
d61c17ea ILT |
1050 | Symbol_table* symtab, |
1051 | Layout* layout, | |
1052 | Target_x86_64* target, | |
1053 | Sized_relobj<64, false>* object, | |
1054 | unsigned int data_shndx, | |
4f4c5f80 | 1055 | Output_section* output_section, |
d61c17ea ILT |
1056 | const elfcpp::Rela<64, false>& reloc, |
1057 | unsigned int r_type, | |
1058 | Symbol* gsym) | |
2e30d253 ILT |
1059 | { |
1060 | switch (r_type) | |
1061 | { | |
1062 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1063 | case elfcpp::R_386_GNU_VTINHERIT: |
1064 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1065 | break; |
1066 | ||
1067 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1068 | case elfcpp::R_X86_64_32: |
1069 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1070 | case elfcpp::R_X86_64_16: |
2e30d253 | 1071 | case elfcpp::R_X86_64_8: |
96f2030e | 1072 | { |
d61c6bd4 ILT |
1073 | // Make a PLT entry if necessary. |
1074 | if (gsym->needs_plt_entry()) | |
1075 | { | |
1076 | target->make_plt_entry(symtab, layout, gsym); | |
1077 | // Since this is not a PC-relative relocation, we may be | |
1078 | // taking the address of a function. In that case we need to | |
1079 | // set the entry in the dynamic symbol table to the address of | |
1080 | // the PLT entry. | |
8851ecca | 1081 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1082 | gsym->set_needs_dynsym_value(); |
1083 | } | |
1084 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1085 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1086 | { |
1087 | if (target->may_need_copy_reloc(gsym)) | |
1088 | { | |
7bf1f802 ILT |
1089 | target->copy_reloc(&options, symtab, layout, object, |
1090 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 ILT |
1091 | } |
1092 | else if (r_type == elfcpp::R_X86_64_64 | |
1093 | && gsym->can_use_relative_reloc(false)) | |
1094 | { | |
1095 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1096 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1097 | output_section, object, | |
1098 | data_shndx, reloc.get_r_offset(), | |
1099 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1100 | } |
1101 | else | |
1102 | { | |
96f2030e | 1103 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1104 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1105 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1106 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1107 | } |
1108 | } | |
1109 | } | |
1110 | break; | |
1111 | ||
1112 | case elfcpp::R_X86_64_PC64: | |
1113 | case elfcpp::R_X86_64_PC32: | |
1114 | case elfcpp::R_X86_64_PC16: | |
1115 | case elfcpp::R_X86_64_PC8: | |
1116 | { | |
1117 | // Make a PLT entry if necessary. | |
1118 | if (gsym->needs_plt_entry()) | |
1119 | target->make_plt_entry(symtab, layout, gsym); | |
1120 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1121 | int flags = Symbol::NON_PIC_REF; |
1122 | if (gsym->type() == elfcpp::STT_FUNC) | |
1123 | flags |= Symbol::FUNCTION_CALL; | |
1124 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1125 | { |
d61c6bd4 ILT |
1126 | if (target->may_need_copy_reloc(gsym)) |
1127 | { | |
7bf1f802 ILT |
1128 | target->copy_reloc(&options, symtab, layout, object, |
1129 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 | 1130 | } |
86849f1f | 1131 | else |
d61c6bd4 ILT |
1132 | { |
1133 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
4f4c5f80 ILT |
1134 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1135 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1136 | reloc.get_r_addend()); |
1137 | } | |
86849f1f | 1138 | } |
d61c6bd4 | 1139 | } |
2e30d253 ILT |
1140 | break; |
1141 | ||
ff006520 | 1142 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1143 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1144 | case elfcpp::R_X86_64_GOTPCREL64: |
1145 | case elfcpp::R_X86_64_GOTPCREL: | |
1146 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1147 | { |
1148 | // The symbol requires a GOT entry. | |
1149 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1150 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1151 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1152 | else |
1153 | { | |
2e30d253 ILT |
1154 | // If this symbol is not fully resolved, we need to add a |
1155 | // dynamic relocation for it. | |
7bf1f802 | 1156 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1157 | if (gsym->is_from_dynobj() |
1158 | || gsym->is_undefined() | |
1159 | || gsym->is_preemptible()) | |
0a65a3a7 | 1160 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1161 | elfcpp::R_X86_64_GLOB_DAT); |
1162 | else | |
2e30d253 | 1163 | { |
0a65a3a7 CC |
1164 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1165 | rela_dyn->add_global_relative( | |
1166 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1167 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1168 | } |
1169 | } | |
ee9e9e86 ILT |
1170 | // For GOTPLT64, we also need a PLT entry (but only if the |
1171 | // symbol is not fully resolved). | |
1172 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1173 | && !gsym->final_value_is_known()) | |
1174 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1175 | } |
1176 | break; | |
1177 | ||
1178 | case elfcpp::R_X86_64_PLT32: | |
1179 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1180 | // Otherwise we need a PLT entry. | |
1181 | if (gsym->final_value_is_known()) | |
1182 | break; | |
96f2030e ILT |
1183 | // If building a shared library, we can also skip the PLT entry |
1184 | // if the symbol is defined in the output file and is protected | |
1185 | // or hidden. | |
1186 | if (gsym->is_defined() | |
1187 | && !gsym->is_from_dynobj() | |
1188 | && !gsym->is_preemptible()) | |
1189 | break; | |
2e30d253 ILT |
1190 | target->make_plt_entry(symtab, layout, gsym); |
1191 | break; | |
1192 | ||
fdc2f80f | 1193 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1194 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1195 | case elfcpp::R_X86_64_GOTPC64: |
1196 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1197 | // We need a GOT section. |
1198 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1199 | // For PLTOFF64, we also need a PLT entry (but only if the |
1200 | // symbol is not fully resolved). | |
1201 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1202 | && !gsym->final_value_is_known()) | |
1203 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1204 | break; |
1205 | ||
2e30d253 ILT |
1206 | case elfcpp::R_X86_64_COPY: |
1207 | case elfcpp::R_X86_64_GLOB_DAT: | |
1208 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1209 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1210 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1211 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1212 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1213 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1214 | gold_error(_("%s: unexpected reloc %u in object file"), |
1215 | object->name().c_str(), r_type); | |
2e30d253 | 1216 | break; |
2e30d253 | 1217 | |
d61c17ea | 1218 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1219 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1220 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1221 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1222 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1223 | case elfcpp::R_X86_64_DTPOFF32: |
1224 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1225 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1226 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1227 | { |
1228 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1229 | const tls::Tls_optimization optimized_type |
1230 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1231 | switch (r_type) |
1232 | { | |
56622147 | 1233 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1234 | if (optimized_type == tls::TLSOPT_NONE) |
1235 | { | |
1236 | // Create a pair of GOT entries for the module index and | |
1237 | // dtv-relative offset. | |
1238 | Output_data_got<64, false>* got | |
1239 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1240 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1241 | target->rela_dyn_section(layout), | |
1242 | elfcpp::R_X86_64_DTPMOD64, | |
1243 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1244 | } |
1245 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1246 | { | |
1247 | // Create a GOT entry for the tp-relative offset. | |
1248 | Output_data_got<64, false>* got | |
1249 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1250 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1251 | target->rela_dyn_section(layout), |
1252 | elfcpp::R_X86_64_TPOFF64); | |
1253 | } | |
1254 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1255 | unsupported_reloc_global(object, r_type, gsym); | |
1256 | break; | |
1257 | ||
56622147 ILT |
1258 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1259 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1260 | // FIXME: If not relaxing to LE, we need to generate | |
1261 | // DTPMOD64 and DTPOFF64, or TLSDESC, relocs. | |
1262 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1263 | unsupported_reloc_global(object, r_type, gsym); | |
2e30d253 ILT |
1264 | break; |
1265 | ||
e041f13d | 1266 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1267 | if (optimized_type == tls::TLSOPT_NONE) |
1268 | { | |
1269 | // Create a GOT entry for the module index. | |
31d60480 | 1270 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1271 | } |
1272 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1273 | unsupported_reloc_global(object, r_type, gsym); | |
1274 | break; | |
1275 | ||
0ffd9845 ILT |
1276 | case elfcpp::R_X86_64_DTPOFF32: |
1277 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1278 | break; |
1279 | ||
56622147 | 1280 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1281 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1282 | if (optimized_type == tls::TLSOPT_NONE) |
1283 | { | |
1284 | // Create a GOT entry for the tp-relative offset. | |
1285 | Output_data_got<64, false>* got | |
1286 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1287 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1288 | target->rela_dyn_section(layout), |
1289 | elfcpp::R_X86_64_TPOFF64); | |
1290 | } | |
1291 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1292 | unsupported_reloc_global(object, r_type, gsym); |
1293 | break; | |
0ffd9845 | 1294 | |
56622147 | 1295 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1296 | layout->set_has_static_tls(); |
8851ecca | 1297 | if (parameters->options().shared()) |
7bf1f802 | 1298 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1299 | break; |
e041f13d ILT |
1300 | |
1301 | default: | |
1302 | gold_unreachable(); | |
2e30d253 ILT |
1303 | } |
1304 | } | |
1305 | break; | |
fdc2f80f ILT |
1306 | |
1307 | case elfcpp::R_X86_64_SIZE32: | |
1308 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1309 | default: |
75f2446e | 1310 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1311 | object->name().c_str(), r_type, |
1312 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1313 | break; |
1314 | } | |
1315 | } | |
1316 | ||
1317 | // Scan relocations for a section. | |
1318 | ||
1319 | void | |
1320 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1321 | Symbol_table* symtab, |
1322 | Layout* layout, | |
1323 | Sized_relobj<64, false>* object, | |
1324 | unsigned int data_shndx, | |
1325 | unsigned int sh_type, | |
1326 | const unsigned char* prelocs, | |
1327 | size_t reloc_count, | |
730cdc88 ILT |
1328 | Output_section* output_section, |
1329 | bool needs_special_offset_handling, | |
d61c17ea | 1330 | size_t local_symbol_count, |
730cdc88 | 1331 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1332 | { |
1333 | if (sh_type == elfcpp::SHT_REL) | |
1334 | { | |
75f2446e ILT |
1335 | gold_error(_("%s: unsupported REL reloc section"), |
1336 | object->name().c_str()); | |
1337 | return; | |
2e30d253 ILT |
1338 | } |
1339 | ||
1340 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1341 | Target_x86_64::Scan>( | |
1342 | options, | |
1343 | symtab, | |
1344 | layout, | |
1345 | this, | |
1346 | object, | |
1347 | data_shndx, | |
1348 | prelocs, | |
1349 | reloc_count, | |
730cdc88 ILT |
1350 | output_section, |
1351 | needs_special_offset_handling, | |
2e30d253 | 1352 | local_symbol_count, |
730cdc88 | 1353 | plocal_symbols); |
2e30d253 ILT |
1354 | } |
1355 | ||
1356 | // Finalize the sections. | |
1357 | ||
1358 | void | |
1359 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1360 | { | |
1361 | // Fill in some more dynamic tags. | |
1362 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1363 | if (odyn != NULL) | |
1364 | { | |
1365 | if (this->got_plt_ != NULL) | |
1366 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1367 | ||
1368 | if (this->plt_ != NULL) | |
1369 | { | |
1370 | const Output_data* od = this->plt_->rel_plt(); | |
1371 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1372 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1373 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
1374 | } | |
1375 | ||
0ffd9845 | 1376 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1377 | { |
0ffd9845 | 1378 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1379 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1380 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1381 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1382 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1383 | } |
1384 | ||
8851ecca | 1385 | if (!parameters->options().shared()) |
2e30d253 ILT |
1386 | { |
1387 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1388 | // linker at run time, and used by the debugger. | |
1389 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1390 | } | |
1391 | } | |
1392 | ||
1393 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1394 | // relocs. | |
1395 | if (this->copy_relocs_ == NULL) | |
1396 | return; | |
1397 | if (this->copy_relocs_->any_to_emit()) | |
1398 | { | |
0ffd9845 ILT |
1399 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
1400 | this->copy_relocs_->emit(rela_dyn); | |
2e30d253 ILT |
1401 | } |
1402 | delete this->copy_relocs_; | |
1403 | this->copy_relocs_ = NULL; | |
1404 | } | |
1405 | ||
1406 | // Perform a relocation. | |
1407 | ||
1408 | inline bool | |
1409 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1410 | Target_x86_64* target, | |
1411 | size_t relnum, | |
0ffd9845 | 1412 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1413 | unsigned int r_type, |
1414 | const Sized_symbol<64>* gsym, | |
1415 | const Symbol_value<64>* psymval, | |
1416 | unsigned char* view, | |
1417 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1418 | section_size_type view_size) |
2e30d253 ILT |
1419 | { |
1420 | if (this->skip_call_tls_get_addr_) | |
1421 | { | |
1422 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1423 | || gsym == NULL | |
0ffd9845 | 1424 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1425 | { |
75f2446e ILT |
1426 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1427 | _("missing expected TLS relocation")); | |
1428 | } | |
1429 | else | |
1430 | { | |
1431 | this->skip_call_tls_get_addr_ = false; | |
1432 | return false; | |
2e30d253 | 1433 | } |
2e30d253 ILT |
1434 | } |
1435 | ||
1436 | // Pick the value to use for symbols defined in shared objects. | |
1437 | Symbol_value<64> symval; | |
96f2030e ILT |
1438 | if (gsym != NULL |
1439 | && (gsym->is_from_dynobj() | |
8851ecca | 1440 | || (parameters->options().shared() |
8fc19601 | 1441 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
96f2030e | 1442 | && gsym->has_plt_offset()) |
2e30d253 ILT |
1443 | { |
1444 | symval.set_output_value(target->plt_section()->address() | |
1445 | + gsym->plt_offset()); | |
1446 | psymval = &symval; | |
1447 | } | |
1448 | ||
1449 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1450 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1451 | ||
1452 | // Get the GOT offset if needed. | |
96f2030e ILT |
1453 | // The GOT pointer points to the end of the GOT section. |
1454 | // We need to subtract the size of the GOT section to get | |
1455 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1456 | bool have_got_offset = false; |
1457 | unsigned int got_offset = 0; | |
1458 | switch (r_type) | |
1459 | { | |
1460 | case elfcpp::R_X86_64_GOT32: | |
1461 | case elfcpp::R_X86_64_GOT64: | |
1462 | case elfcpp::R_X86_64_GOTPLT64: | |
1463 | case elfcpp::R_X86_64_GOTPCREL: | |
1464 | case elfcpp::R_X86_64_GOTPCREL64: | |
1465 | if (gsym != NULL) | |
1466 | { | |
0a65a3a7 CC |
1467 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1468 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1469 | } |
1470 | else | |
1471 | { | |
1472 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1473 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1474 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1475 | - target->got_size()); | |
0ffd9845 ILT |
1476 | } |
1477 | have_got_offset = true; | |
1478 | break; | |
1479 | ||
1480 | default: | |
1481 | break; | |
1482 | } | |
2e30d253 ILT |
1483 | |
1484 | switch (r_type) | |
1485 | { | |
1486 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1487 | case elfcpp::R_386_GNU_VTINHERIT: |
1488 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1489 | break; |
1490 | ||
1491 | case elfcpp::R_X86_64_64: | |
1492 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1493 | break; | |
1494 | ||
1495 | case elfcpp::R_X86_64_PC64: | |
1496 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1497 | address); | |
1498 | break; | |
1499 | ||
1500 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1501 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1502 | // uint64_t x = value + addend; | |
1503 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1504 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1505 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1506 | break; | |
1507 | ||
1508 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1509 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1510 | // int64_t x = value + addend; // note this quantity is signed! | |
1511 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1512 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1513 | break; | |
1514 | ||
1515 | case elfcpp::R_X86_64_PC32: | |
1516 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1517 | address); | |
1518 | break; | |
1519 | ||
1520 | case elfcpp::R_X86_64_16: | |
1521 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1522 | break; | |
1523 | ||
1524 | case elfcpp::R_X86_64_PC16: | |
1525 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1526 | address); | |
1527 | break; | |
1528 | ||
1529 | case elfcpp::R_X86_64_8: | |
1530 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1531 | break; | |
1532 | ||
1533 | case elfcpp::R_X86_64_PC8: | |
1534 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1535 | address); | |
1536 | break; | |
1537 | ||
1538 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1539 | gold_assert(gsym == NULL |
1540 | || gsym->has_plt_offset() | |
99f8faca ILT |
1541 | || gsym->final_value_is_known() |
1542 | || (gsym->is_defined() | |
1543 | && !gsym->is_from_dynobj() | |
1544 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1545 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1546 | // behaves differently because psymval was set to point to | |
1547 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1548 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1549 | address); | |
1550 | break; | |
1551 | ||
ee9e9e86 ILT |
1552 | case elfcpp::R_X86_64_PLTOFF64: |
1553 | { | |
1554 | gold_assert(gsym); | |
1555 | gold_assert(gsym->has_plt_offset() | |
1556 | || gsym->final_value_is_known()); | |
1557 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1558 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1559 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1560 | addend - got_address); | |
ee9e9e86 ILT |
1561 | } |
1562 | ||
2e30d253 | 1563 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1564 | gold_assert(have_got_offset); |
1565 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1566 | break; |
1567 | ||
e822f2b1 ILT |
1568 | case elfcpp::R_X86_64_GOTPC32: |
1569 | { | |
1570 | gold_assert(gsym); | |
1571 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1572 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1573 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1574 | } | |
1575 | break; | |
1576 | ||
1577 | case elfcpp::R_X86_64_GOT64: | |
1578 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1579 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1580 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1581 | gold_assert(have_got_offset); |
1582 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1583 | break; |
1584 | ||
1585 | case elfcpp::R_X86_64_GOTPC64: | |
1586 | { | |
1587 | gold_assert(gsym); | |
1588 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1589 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1590 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1591 | } | |
1592 | break; | |
1593 | ||
2e30d253 ILT |
1594 | case elfcpp::R_X86_64_GOTOFF64: |
1595 | { | |
1596 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1597 | value = (psymval->value(object, 0) | |
96f2030e | 1598 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1599 | Relocate_functions<64, false>::rela64(view, value, addend); |
1600 | } | |
1601 | break; | |
1602 | ||
1603 | case elfcpp::R_X86_64_GOTPCREL: | |
1604 | { | |
0ffd9845 ILT |
1605 | gold_assert(have_got_offset); |
1606 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1607 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1608 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1609 | } |
1610 | break; | |
1611 | ||
e822f2b1 ILT |
1612 | case elfcpp::R_X86_64_GOTPCREL64: |
1613 | { | |
0ffd9845 ILT |
1614 | gold_assert(have_got_offset); |
1615 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1616 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1617 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1618 | } |
1619 | break; | |
1620 | ||
2e30d253 ILT |
1621 | case elfcpp::R_X86_64_COPY: |
1622 | case elfcpp::R_X86_64_GLOB_DAT: | |
1623 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1624 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1625 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1626 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1627 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1628 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1629 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1630 | _("unexpected reloc %u in object file"), | |
1631 | r_type); | |
2e30d253 ILT |
1632 | break; |
1633 | ||
d61c17ea | 1634 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1635 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1636 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1637 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1638 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1639 | case elfcpp::R_X86_64_DTPOFF32: |
1640 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1641 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1642 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1643 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1644 | view, address, view_size); | |
2e30d253 | 1645 | break; |
2e30d253 | 1646 | |
fdc2f80f ILT |
1647 | case elfcpp::R_X86_64_SIZE32: |
1648 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1649 | default: |
75f2446e ILT |
1650 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1651 | _("unsupported reloc %u"), | |
1652 | r_type); | |
2e30d253 ILT |
1653 | break; |
1654 | } | |
1655 | ||
1656 | return true; | |
1657 | } | |
1658 | ||
1659 | // Perform a TLS relocation. | |
1660 | ||
1661 | inline void | |
d61c17ea | 1662 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1663 | Target_x86_64* target, |
d61c17ea | 1664 | size_t relnum, |
72ec2876 | 1665 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1666 | unsigned int r_type, |
1667 | const Sized_symbol<64>* gsym, | |
1668 | const Symbol_value<64>* psymval, | |
1669 | unsigned char* view, | |
6a41d30b | 1670 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1671 | section_size_type view_size) |
2e30d253 | 1672 | { |
2e30d253 | 1673 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1674 | |
1675 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1676 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1677 | |
1678 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1679 | ||
1680 | const bool is_final = (gsym == NULL | |
8851ecca | 1681 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1682 | : gsym->final_value_is_known()); |
e041f13d ILT |
1683 | const tls::Tls_optimization optimized_type |
1684 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1685 | switch (r_type) |
1686 | { | |
56622147 ILT |
1687 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1688 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d ILT |
1689 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1690 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2e30d253 | 1691 | { |
7bf1f802 | 1692 | gold_assert(tls_segment != NULL); |
2e30d253 | 1693 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1694 | rela, r_type, value, view, |
2e30d253 ILT |
1695 | view_size); |
1696 | break; | |
1697 | } | |
7bf1f802 ILT |
1698 | else |
1699 | { | |
1700 | unsigned int got_offset; | |
1701 | if (gsym != NULL) | |
1702 | { | |
0a65a3a7 CC |
1703 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_PAIR)); |
1704 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_PAIR) | |
1705 | - target->got_size()); | |
7bf1f802 ILT |
1706 | } |
1707 | else | |
1708 | { | |
1709 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1710 | gold_assert(object->local_has_got_offset(r_sym, |
1711 | GOT_TYPE_TLS_PAIR)); | |
1712 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_PAIR) | |
7bf1f802 ILT |
1713 | - target->got_size()); |
1714 | } | |
1715 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1716 | { | |
1717 | gold_assert(tls_segment != NULL); | |
1718 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
1719 | got_offset, view, view_size); | |
1720 | break; | |
1721 | } | |
1722 | else if (optimized_type == tls::TLSOPT_NONE) | |
1723 | { | |
1724 | // Relocate the field with the offset of the pair of GOT | |
1725 | // entries. | |
6a41d30b ILT |
1726 | value = target->got_plt_section()->address() + got_offset; |
1727 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1728 | address); | |
7bf1f802 ILT |
1729 | break; |
1730 | } | |
1731 | } | |
72ec2876 | 1732 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1733 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1734 | break; |
1735 | ||
56622147 | 1736 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
e041f13d ILT |
1737 | if (optimized_type == tls::TLSOPT_TO_LE) |
1738 | { | |
7bf1f802 | 1739 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
1740 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
1741 | value, view, view_size); | |
1742 | break; | |
e041f13d | 1743 | } |
7bf1f802 ILT |
1744 | else if (optimized_type == tls::TLSOPT_NONE) |
1745 | { | |
1746 | // Relocate the field with the offset of the GOT entry for | |
1747 | // the module index. | |
1748 | unsigned int got_offset; | |
31d60480 ILT |
1749 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1750 | - target->got_size()); | |
6a41d30b ILT |
1751 | value = target->got_plt_section()->address() + got_offset; |
1752 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1753 | address); | |
7bf1f802 ILT |
1754 | break; |
1755 | } | |
72ec2876 | 1756 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1757 | _("unsupported reloc %u"), r_type); |
2e30d253 | 1758 | break; |
0ffd9845 ILT |
1759 | |
1760 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 1761 | gold_assert(tls_segment != NULL); |
e041f13d | 1762 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
1763 | value -= tls_segment->memsz(); |
1764 | Relocate_functions<64, false>::rela32(view, value, 0); | |
0ffd9845 ILT |
1765 | break; |
1766 | ||
1767 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 1768 | gold_assert(tls_segment != NULL); |
e041f13d | 1769 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
1770 | value -= tls_segment->memsz(); |
1771 | Relocate_functions<64, false>::rela64(view, value, 0); | |
0ffd9845 | 1772 | break; |
2e30d253 | 1773 | |
56622147 ILT |
1774 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1775 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1776 | { | |
7bf1f802 | 1777 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1778 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1779 | rela, r_type, value, view, | |
1780 | view_size); | |
1781 | break; | |
1782 | } | |
7bf1f802 ILT |
1783 | else if (optimized_type == tls::TLSOPT_NONE) |
1784 | { | |
1785 | // Relocate the field with the offset of the GOT entry for | |
1786 | // the tp-relative offset of the symbol. | |
1787 | unsigned int got_offset; | |
1788 | if (gsym != NULL) | |
1789 | { | |
0a65a3a7 CC |
1790 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
1791 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
1792 | - target->got_size()); | |
7bf1f802 ILT |
1793 | } |
1794 | else | |
1795 | { | |
1796 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1797 | gold_assert(object->local_has_got_offset(r_sym, |
1798 | GOT_TYPE_TLS_OFFSET)); | |
1799 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
1800 | - target->got_size()); |
1801 | } | |
6a41d30b ILT |
1802 | value = target->got_plt_section()->address() + got_offset; |
1803 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
1804 | break; |
1805 | } | |
56622147 ILT |
1806 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1807 | _("unsupported reloc type %u"), | |
1808 | r_type); | |
1809 | break; | |
0ffd9845 | 1810 | |
56622147 | 1811 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b ILT |
1812 | value -= tls_segment->memsz(); |
1813 | Relocate_functions<64, false>::rela32(view, value, 0); | |
56622147 | 1814 | break; |
2e30d253 | 1815 | } |
2e30d253 ILT |
1816 | } |
1817 | ||
7bf1f802 ILT |
1818 | // Do a relocation in which we convert a TLS General-Dynamic to an |
1819 | // Initial-Exec. | |
1820 | ||
1821 | inline void | |
1822 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
1823 | size_t relnum, | |
1824 | Output_segment* tls_segment, | |
1825 | const elfcpp::Rela<64, false>& rela, | |
1826 | unsigned int, | |
1827 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1828 | unsigned char* view, | |
fe8718a4 | 1829 | section_size_type view_size) |
7bf1f802 ILT |
1830 | { |
1831 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
1832 | // .word 0x6666; rex64; call __tls_get_addr | |
1833 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
1834 | ||
1835 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
1836 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
1837 | ||
1838 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1839 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1840 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1841 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
1842 | ||
1843 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
1844 | ||
6a41d30b | 1845 | value -= tls_segment->memsz(); |
7bf1f802 ILT |
1846 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
1847 | ||
1848 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1849 | // We can skip it. | |
1850 | this->skip_call_tls_get_addr_ = true; | |
1851 | } | |
1852 | ||
e041f13d | 1853 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
1854 | // Local-Exec. |
1855 | ||
1856 | inline void | |
d61c17ea ILT |
1857 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
1858 | size_t relnum, | |
1859 | Output_segment* tls_segment, | |
72ec2876 | 1860 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1861 | unsigned int, |
1862 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1863 | unsigned char* view, | |
fe8718a4 | 1864 | section_size_type view_size) |
2e30d253 | 1865 | { |
0ffd9845 ILT |
1866 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
1867 | // .word 0x6666; rex64; call __tls_get_addr | |
1868 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 1869 | |
72ec2876 ILT |
1870 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
1871 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 1872 | |
72ec2876 ILT |
1873 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1874 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1875 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1876 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 1877 | |
0ffd9845 | 1878 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 1879 | |
6a41d30b | 1880 | value -= tls_segment->memsz(); |
0ffd9845 | 1881 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
1882 | |
1883 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1884 | // We can skip it. | |
1885 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1886 | } |
1887 | ||
2e30d253 | 1888 | inline void |
72ec2876 ILT |
1889 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
1890 | size_t relnum, | |
1891 | Output_segment*, | |
1892 | const elfcpp::Rela<64, false>& rela, | |
1893 | unsigned int, | |
1894 | elfcpp::Elf_types<64>::Elf_Addr, | |
1895 | unsigned char* view, | |
fe8718a4 | 1896 | section_size_type view_size) |
2e30d253 | 1897 | { |
72ec2876 ILT |
1898 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
1899 | // ... leq foo@dtpoff(%rax),%reg | |
1900 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 1901 | |
72ec2876 ILT |
1902 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
1903 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 1904 | |
72ec2876 ILT |
1905 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1906 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
1907 | ||
1908 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
1909 | ||
1910 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
1911 | ||
1912 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1913 | // We can skip it. | |
1914 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1915 | } |
1916 | ||
56622147 ILT |
1917 | // Do a relocation in which we convert a TLS Initial-Exec to a |
1918 | // Local-Exec. | |
1919 | ||
1920 | inline void | |
1921 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
1922 | size_t relnum, | |
1923 | Output_segment* tls_segment, | |
1924 | const elfcpp::Rela<64, false>& rela, | |
1925 | unsigned int, | |
1926 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1927 | unsigned char* view, | |
fe8718a4 | 1928 | section_size_type view_size) |
56622147 ILT |
1929 | { |
1930 | // We need to examine the opcodes to figure out which instruction we | |
1931 | // are looking at. | |
1932 | ||
1933 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
1934 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
1935 | ||
1936 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
1937 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
1938 | ||
1939 | unsigned char op1 = view[-3]; | |
1940 | unsigned char op2 = view[-2]; | |
1941 | unsigned char op3 = view[-1]; | |
1942 | unsigned char reg = op3 >> 3; | |
1943 | ||
1944 | if (op2 == 0x8b) | |
1945 | { | |
1946 | // movq | |
1947 | if (op1 == 0x4c) | |
1948 | view[-3] = 0x49; | |
1949 | view[-2] = 0xc7; | |
1950 | view[-1] = 0xc0 | reg; | |
1951 | } | |
1952 | else if (reg == 4) | |
1953 | { | |
1954 | // Special handling for %rsp. | |
1955 | if (op1 == 0x4c) | |
1956 | view[-3] = 0x49; | |
1957 | view[-2] = 0x81; | |
1958 | view[-1] = 0xc0 | reg; | |
1959 | } | |
1960 | else | |
1961 | { | |
1962 | // addq | |
1963 | if (op1 == 0x4c) | |
1964 | view[-3] = 0x4d; | |
1965 | view[-2] = 0x8d; | |
1966 | view[-1] = 0x80 | reg | (reg << 3); | |
1967 | } | |
1968 | ||
6a41d30b | 1969 | value -= tls_segment->memsz(); |
56622147 ILT |
1970 | Relocate_functions<64, false>::rela32(view, value, 0); |
1971 | } | |
1972 | ||
2e30d253 ILT |
1973 | // Relocate section data. |
1974 | ||
1975 | void | |
1976 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
1977 | unsigned int sh_type, |
1978 | const unsigned char* prelocs, | |
1979 | size_t reloc_count, | |
730cdc88 ILT |
1980 | Output_section* output_section, |
1981 | bool needs_special_offset_handling, | |
d61c17ea ILT |
1982 | unsigned char* view, |
1983 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1984 | section_size_type view_size) |
2e30d253 ILT |
1985 | { |
1986 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
1987 | ||
1988 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1989 | Target_x86_64::Relocate>( | |
1990 | relinfo, | |
1991 | this, | |
1992 | prelocs, | |
1993 | reloc_count, | |
730cdc88 ILT |
1994 | output_section, |
1995 | needs_special_offset_handling, | |
2e30d253 ILT |
1996 | view, |
1997 | address, | |
1998 | view_size); | |
1999 | } | |
2000 | ||
6a74a719 ILT |
2001 | // Return the size of a relocation while scanning during a relocatable |
2002 | // link. | |
2003 | ||
2004 | unsigned int | |
2005 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2006 | unsigned int r_type, | |
2007 | Relobj* object) | |
2008 | { | |
2009 | switch (r_type) | |
2010 | { | |
2011 | case elfcpp::R_X86_64_NONE: | |
2012 | case elfcpp::R_386_GNU_VTINHERIT: | |
2013 | case elfcpp::R_386_GNU_VTENTRY: | |
2014 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2015 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2016 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2017 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2018 | case elfcpp::R_X86_64_DTPOFF32: | |
2019 | case elfcpp::R_X86_64_DTPOFF64: | |
2020 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2021 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2022 | return 0; | |
2023 | ||
2024 | case elfcpp::R_X86_64_64: | |
2025 | case elfcpp::R_X86_64_PC64: | |
2026 | case elfcpp::R_X86_64_GOTOFF64: | |
2027 | case elfcpp::R_X86_64_GOTPC64: | |
2028 | case elfcpp::R_X86_64_PLTOFF64: | |
2029 | case elfcpp::R_X86_64_GOT64: | |
2030 | case elfcpp::R_X86_64_GOTPCREL64: | |
2031 | case elfcpp::R_X86_64_GOTPCREL: | |
2032 | case elfcpp::R_X86_64_GOTPLT64: | |
2033 | return 8; | |
2034 | ||
2035 | case elfcpp::R_X86_64_32: | |
2036 | case elfcpp::R_X86_64_32S: | |
2037 | case elfcpp::R_X86_64_PC32: | |
2038 | case elfcpp::R_X86_64_PLT32: | |
2039 | case elfcpp::R_X86_64_GOTPC32: | |
2040 | case elfcpp::R_X86_64_GOT32: | |
2041 | return 4; | |
2042 | ||
2043 | case elfcpp::R_X86_64_16: | |
2044 | case elfcpp::R_X86_64_PC16: | |
2045 | return 2; | |
2046 | ||
2047 | case elfcpp::R_X86_64_8: | |
2048 | case elfcpp::R_X86_64_PC8: | |
2049 | return 1; | |
2050 | ||
2051 | case elfcpp::R_X86_64_COPY: | |
2052 | case elfcpp::R_X86_64_GLOB_DAT: | |
2053 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2054 | case elfcpp::R_X86_64_RELATIVE: | |
2055 | // These are outstanding tls relocs, which are unexpected when linking | |
2056 | case elfcpp::R_X86_64_TPOFF64: | |
2057 | case elfcpp::R_X86_64_DTPMOD64: | |
2058 | case elfcpp::R_X86_64_TLSDESC: | |
2059 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2060 | return 0; | |
2061 | ||
2062 | case elfcpp::R_X86_64_SIZE32: | |
2063 | case elfcpp::R_X86_64_SIZE64: | |
2064 | default: | |
2065 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2066 | return 0; | |
2067 | } | |
2068 | } | |
2069 | ||
2070 | // Scan the relocs during a relocatable link. | |
2071 | ||
2072 | void | |
2073 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2074 | Symbol_table* symtab, | |
2075 | Layout* layout, | |
2076 | Sized_relobj<64, false>* object, | |
2077 | unsigned int data_shndx, | |
2078 | unsigned int sh_type, | |
2079 | const unsigned char* prelocs, | |
2080 | size_t reloc_count, | |
2081 | Output_section* output_section, | |
2082 | bool needs_special_offset_handling, | |
2083 | size_t local_symbol_count, | |
2084 | const unsigned char* plocal_symbols, | |
2085 | Relocatable_relocs* rr) | |
2086 | { | |
2087 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2088 | ||
2089 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2090 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2091 | ||
7019cd25 | 2092 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2093 | Scan_relocatable_relocs>( |
2094 | options, | |
2095 | symtab, | |
2096 | layout, | |
2097 | object, | |
2098 | data_shndx, | |
2099 | prelocs, | |
2100 | reloc_count, | |
2101 | output_section, | |
2102 | needs_special_offset_handling, | |
2103 | local_symbol_count, | |
2104 | plocal_symbols, | |
2105 | rr); | |
2106 | } | |
2107 | ||
2108 | // Relocate a section during a relocatable link. | |
2109 | ||
2110 | void | |
2111 | Target_x86_64::relocate_for_relocatable( | |
2112 | const Relocate_info<64, false>* relinfo, | |
2113 | unsigned int sh_type, | |
2114 | const unsigned char* prelocs, | |
2115 | size_t reloc_count, | |
2116 | Output_section* output_section, | |
2117 | off_t offset_in_output_section, | |
2118 | const Relocatable_relocs* rr, | |
2119 | unsigned char* view, | |
2120 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2121 | section_size_type view_size, | |
2122 | unsigned char* reloc_view, | |
2123 | section_size_type reloc_view_size) | |
2124 | { | |
2125 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2126 | ||
7019cd25 | 2127 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2128 | relinfo, |
2129 | prelocs, | |
2130 | reloc_count, | |
2131 | output_section, | |
2132 | offset_in_output_section, | |
2133 | rr, | |
2134 | view, | |
2135 | view_address, | |
2136 | view_size, | |
2137 | reloc_view, | |
2138 | reloc_view_size); | |
2139 | } | |
2140 | ||
4fb6c25d ILT |
2141 | // Return the value to use for a dynamic which requires special |
2142 | // treatment. This is how we support equality comparisons of function | |
2143 | // pointers across shared library boundaries, as described in the | |
2144 | // processor specific ABI supplement. | |
2145 | ||
2146 | uint64_t | |
2147 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2148 | { | |
2149 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2150 | return this->plt_section()->address() + gsym->plt_offset(); | |
2151 | } | |
2152 | ||
2e30d253 ILT |
2153 | // Return a string used to fill a code section with nops to take up |
2154 | // the specified length. | |
2155 | ||
2156 | std::string | |
8851ecca | 2157 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2158 | { |
2159 | if (length >= 16) | |
2160 | { | |
2161 | // Build a jmpq instruction to skip over the bytes. | |
2162 | unsigned char jmp[5]; | |
2163 | jmp[0] = 0xe9; | |
2164 | elfcpp::Swap_unaligned<64, false>::writeval(jmp + 1, length - 5); | |
2165 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
2166 | + std::string(length - 5, '\0')); | |
2167 | } | |
2168 | ||
2169 | // Nop sequences of various lengths. | |
2170 | const char nop1[1] = { 0x90 }; // nop | |
2171 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2172 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2173 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2174 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2175 | 0x00 }; // leal 0(%esi,1),%esi | |
2176 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2177 | 0x00, 0x00 }; | |
2178 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2179 | 0x00, 0x00, 0x00 }; | |
2180 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2181 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2182 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2183 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2184 | 0x00 }; | |
2185 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2186 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2187 | 0x00, 0x00 }; | |
2188 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2189 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2190 | 0x00, 0x00, 0x00 }; | |
2191 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2192 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2193 | 0x00, 0x00, 0x00, 0x00 }; | |
2194 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2195 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2196 | 0x27, 0x00, 0x00, 0x00, | |
2197 | 0x00 }; | |
2198 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2199 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2200 | 0xbc, 0x27, 0x00, 0x00, | |
2201 | 0x00, 0x00 }; | |
2202 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2203 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2204 | 0x90, 0x90, 0x90, 0x90, | |
2205 | 0x90, 0x90, 0x90 }; | |
2206 | ||
2207 | const char* nops[16] = { | |
2208 | NULL, | |
2209 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2210 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2211 | }; | |
2212 | ||
2213 | return std::string(nops[length], length); | |
2214 | } | |
2215 | ||
2216 | // The selector for x86_64 object files. | |
2217 | ||
2218 | class Target_selector_x86_64 : public Target_selector | |
2219 | { | |
2220 | public: | |
2221 | Target_selector_x86_64() | |
2222 | : Target_selector(elfcpp::EM_X86_64, 64, false) | |
2223 | { } | |
2224 | ||
2225 | Target* | |
2226 | recognize(int machine, int osabi, int abiversion); | |
2227 | ||
0daa6f62 ILT |
2228 | Target* |
2229 | recognize_by_name(const char*); | |
2230 | ||
2e30d253 ILT |
2231 | private: |
2232 | Target_x86_64* target_; | |
2233 | }; | |
2234 | ||
2235 | // Recognize an x86_64 object file when we already know that the machine | |
2236 | // number is EM_X86_64. | |
2237 | ||
2238 | Target* | |
2239 | Target_selector_x86_64::recognize(int, int, int) | |
2240 | { | |
2241 | if (this->target_ == NULL) | |
2242 | this->target_ = new Target_x86_64(); | |
2243 | return this->target_; | |
2244 | } | |
2245 | ||
0daa6f62 ILT |
2246 | Target* |
2247 | Target_selector_x86_64::recognize_by_name(const char* name) | |
2248 | { | |
2249 | if (strcmp(name, "elf64-x86-64") != 0) | |
2250 | return NULL; | |
2251 | if (this->target_ == NULL) | |
2252 | this->target_ = new Target_x86_64(); | |
2253 | return this->target_; | |
2254 | } | |
2255 | ||
2e30d253 ILT |
2256 | Target_selector_x86_64 target_selector_x86_64; |
2257 | ||
2258 | } // End anonymous namespace. |