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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
3 | // Copyright 2006, 2007, Free Software Foundation, Inc. | |
4 | // Written by Ian Lance Taylor <iant@google.com>. | |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8 | // This program is free software; you can redistribute it and/or | |
9 | // modify it under the terms of the GNU Library General Public License | |
10 | // as published by the Free Software Foundation; either version 2, or | |
11 | // (at your option) any later version. | |
12 | ||
13 | // In addition to the permissions in the GNU Library General Public | |
14 | // License, the Free Software Foundation gives you unlimited | |
15 | // permission to link the compiled version of this file into | |
16 | // combinations with other programs, and to distribute those | |
17 | // combinations without any restriction coming from the use of this | |
18 | // file. (The Library Public License restrictions do apply in other | |
19 | // respects; for example, they cover modification of the file, and | |
20 | /// distribution when not linked into a combined executable.) | |
21 | ||
22 | // This program is distributed in the hope that it will be useful, but | |
23 | // WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
25 | // Library General Public License for more details. | |
26 | ||
27 | // You should have received a copy of the GNU Library General Public | |
28 | // License along with this program; if not, write to the Free Software | |
29 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA | |
30 | // 02110-1301, USA. | |
31 | ||
32 | #include "gold.h" | |
33 | ||
34 | #include <cstring> | |
35 | ||
36 | #include "elfcpp.h" | |
37 | #include "parameters.h" | |
38 | #include "reloc.h" | |
39 | #include "x86_64.h" | |
40 | #include "object.h" | |
41 | #include "symtab.h" | |
42 | #include "layout.h" | |
43 | #include "output.h" | |
44 | #include "target.h" | |
45 | #include "target-reloc.h" | |
46 | #include "target-select.h" | |
e041f13d | 47 | #include "tls.h" |
2e30d253 ILT |
48 | |
49 | namespace | |
50 | { | |
51 | ||
52 | using namespace gold; | |
53 | ||
54 | class Output_data_plt_x86_64; | |
55 | ||
56 | // The x86_64 target class. | |
d61c17ea ILT |
57 | // See the ABI at |
58 | // http://www.x86-64.org/documentation/abi.pdf | |
59 | // TLS info comes from | |
60 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 61 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 ILT |
62 | |
63 | class Target_x86_64 : public Sized_target<64, false> | |
64 | { | |
65 | public: | |
e822f2b1 ILT |
66 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
67 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
68 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
69 | ||
70 | Target_x86_64() | |
71 | : Sized_target<64, false>(&x86_64_info), | |
0ffd9845 | 72 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
2e30d253 ILT |
73 | copy_relocs_(NULL), dynbss_(NULL) |
74 | { } | |
75 | ||
76 | // Scan the relocations to look for symbol adjustments. | |
77 | void | |
78 | scan_relocs(const General_options& options, | |
79 | Symbol_table* symtab, | |
80 | Layout* layout, | |
81 | Sized_relobj<64, false>* object, | |
82 | unsigned int data_shndx, | |
83 | unsigned int sh_type, | |
84 | const unsigned char* prelocs, | |
85 | size_t reloc_count, | |
730cdc88 ILT |
86 | Output_section* output_section, |
87 | bool needs_special_offset_handling, | |
2e30d253 | 88 | size_t local_symbol_count, |
730cdc88 | 89 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
90 | |
91 | // Finalize the sections. | |
92 | void | |
93 | do_finalize_sections(Layout*); | |
94 | ||
4fb6c25d ILT |
95 | // Return the value to use for a dynamic which requires special |
96 | // treatment. | |
97 | uint64_t | |
98 | do_dynsym_value(const Symbol*) const; | |
99 | ||
2e30d253 ILT |
100 | // Relocate a section. |
101 | void | |
102 | relocate_section(const Relocate_info<64, false>*, | |
103 | unsigned int sh_type, | |
104 | const unsigned char* prelocs, | |
105 | size_t reloc_count, | |
730cdc88 ILT |
106 | Output_section* output_section, |
107 | bool needs_special_offset_handling, | |
2e30d253 ILT |
108 | unsigned char* view, |
109 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
110 | off_t view_size); | |
111 | ||
112 | // Return a string used to fill a code section with nops. | |
113 | std::string | |
114 | do_code_fill(off_t length); | |
115 | ||
9a2d6984 ILT |
116 | // Return whether SYM is defined by the ABI. |
117 | bool | |
118 | do_is_defined_by_abi(Symbol* sym) const | |
119 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
120 | ||
96f2030e ILT |
121 | // Return the size of the GOT section. |
122 | off_t | |
123 | got_size() | |
124 | { | |
125 | gold_assert(this->got_ != NULL); | |
126 | return this->got_->data_size(); | |
127 | } | |
128 | ||
2e30d253 ILT |
129 | private: |
130 | // The class which scans relocations. | |
131 | struct Scan | |
132 | { | |
133 | inline void | |
134 | local(const General_options& options, Symbol_table* symtab, | |
135 | Layout* layout, Target_x86_64* target, | |
136 | Sized_relobj<64, false>* object, | |
137 | unsigned int data_shndx, | |
07f397ab | 138 | Output_section* output_section, |
2e30d253 ILT |
139 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
140 | const elfcpp::Sym<64, false>& lsym); | |
141 | ||
142 | inline void | |
143 | global(const General_options& options, Symbol_table* symtab, | |
144 | Layout* layout, Target_x86_64* target, | |
145 | Sized_relobj<64, false>* object, | |
146 | unsigned int data_shndx, | |
07f397ab | 147 | Output_section* output_section, |
2e30d253 ILT |
148 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
149 | Symbol* gsym); | |
e041f13d ILT |
150 | |
151 | static void | |
152 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
153 | ||
154 | static void | |
155 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
156 | Symbol*); | |
2e30d253 ILT |
157 | }; |
158 | ||
159 | // The class which implements relocation. | |
160 | class Relocate | |
161 | { | |
162 | public: | |
163 | Relocate() | |
164 | : skip_call_tls_get_addr_(false) | |
165 | { } | |
166 | ||
167 | ~Relocate() | |
168 | { | |
169 | if (this->skip_call_tls_get_addr_) | |
170 | { | |
171 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 172 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
173 | } |
174 | } | |
175 | ||
176 | // Do a relocation. Return false if the caller should not issue | |
177 | // any warnings about this relocation. | |
178 | inline bool | |
179 | relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum, | |
180 | const elfcpp::Rela<64, false>&, | |
181 | unsigned int r_type, const Sized_symbol<64>*, | |
182 | const Symbol_value<64>*, | |
183 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
184 | off_t); | |
185 | ||
186 | private: | |
187 | // Do a TLS relocation. | |
188 | inline void | |
7bf1f802 ILT |
189 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
190 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
191 | unsigned int r_type, const Sized_symbol<64>*, |
192 | const Symbol_value<64>*, | |
193 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, off_t); | |
194 | ||
7bf1f802 ILT |
195 | // Do a TLS General-Dynamic to Local-Exec transition. |
196 | inline void | |
197 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
198 | Output_segment* tls_segment, | |
199 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
200 | elfcpp::Elf_types<64>::Elf_Addr value, | |
201 | unsigned char* view, | |
202 | off_t view_size); | |
203 | ||
56622147 ILT |
204 | // Do a TLS General-Dynamic to Local-Exec transition. |
205 | inline void | |
206 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
207 | Output_segment* tls_segment, |
208 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
209 | elfcpp::Elf_types<64>::Elf_Addr value, | |
210 | unsigned char* view, | |
211 | off_t view_size); | |
212 | ||
56622147 | 213 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 214 | inline void |
56622147 | 215 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
216 | Output_segment* tls_segment, |
217 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
218 | elfcpp::Elf_types<64>::Elf_Addr value, | |
219 | unsigned char* view, | |
220 | off_t view_size); | |
221 | ||
56622147 ILT |
222 | // Do a TLS Initial-Exec to Local-Exec transition. |
223 | static inline void | |
224 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
225 | Output_segment* tls_segment, |
226 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
227 | elfcpp::Elf_types<64>::Elf_Addr value, | |
228 | unsigned char* view, | |
229 | off_t view_size); | |
2e30d253 ILT |
230 | |
231 | // This is set if we should skip the next reloc, which should be a | |
232 | // PLT32 reloc against ___tls_get_addr. | |
233 | bool skip_call_tls_get_addr_; | |
234 | }; | |
235 | ||
236 | // Adjust TLS relocation type based on the options and whether this | |
237 | // is a local symbol. | |
e041f13d | 238 | static tls::Tls_optimization |
2e30d253 ILT |
239 | optimize_tls_reloc(bool is_final, int r_type); |
240 | ||
241 | // Get the GOT section, creating it if necessary. | |
242 | Output_data_got<64, false>* | |
243 | got_section(Symbol_table*, Layout*); | |
244 | ||
96f2030e ILT |
245 | // Get the GOT PLT section. |
246 | Output_data_space* | |
247 | got_plt_section() const | |
248 | { | |
249 | gold_assert(this->got_plt_ != NULL); | |
250 | return this->got_plt_; | |
251 | } | |
252 | ||
2e30d253 ILT |
253 | // Create a PLT entry for a global symbol. |
254 | void | |
255 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
256 | ||
257 | // Get the PLT section. | |
258 | Output_data_plt_x86_64* | |
259 | plt_section() const | |
260 | { | |
261 | gold_assert(this->plt_ != NULL); | |
262 | return this->plt_; | |
263 | } | |
264 | ||
265 | // Get the dynamic reloc section, creating it if necessary. | |
266 | Reloc_section* | |
0ffd9845 | 267 | rela_dyn_section(Layout*); |
2e30d253 | 268 | |
d61c6bd4 ILT |
269 | // Return true if the symbol may need a COPY relocation. |
270 | // References from an executable object to non-function symbols | |
271 | // defined in a dynamic object may need a COPY relocation. | |
272 | bool | |
273 | may_need_copy_reloc(Symbol* gsym) | |
274 | { | |
275 | return (!parameters->output_is_shared() | |
276 | && gsym->is_from_dynobj() | |
277 | && gsym->type() != elfcpp::STT_FUNC); | |
278 | } | |
279 | ||
2e30d253 ILT |
280 | // Copy a relocation against a global symbol. |
281 | void | |
282 | copy_reloc(const General_options*, Symbol_table*, Layout*, | |
283 | Sized_relobj<64, false>*, unsigned int, | |
4f4c5f80 | 284 | Output_section*, Symbol*, const elfcpp::Rela<64, false>&); |
2e30d253 ILT |
285 | |
286 | // Information about this specific target which we pass to the | |
287 | // general Target structure. | |
288 | static const Target::Target_info x86_64_info; | |
289 | ||
290 | // The GOT section. | |
291 | Output_data_got<64, false>* got_; | |
292 | // The PLT section. | |
293 | Output_data_plt_x86_64* plt_; | |
294 | // The GOT PLT section. | |
295 | Output_data_space* got_plt_; | |
296 | // The dynamic reloc section. | |
0ffd9845 | 297 | Reloc_section* rela_dyn_; |
2e30d253 ILT |
298 | // Relocs saved to avoid a COPY reloc. |
299 | Copy_relocs<64, false>* copy_relocs_; | |
300 | // Space for variables copied with a COPY reloc. | |
301 | Output_data_space* dynbss_; | |
302 | }; | |
303 | ||
304 | const Target::Target_info Target_x86_64::x86_64_info = | |
305 | { | |
306 | 64, // size | |
307 | false, // is_big_endian | |
308 | elfcpp::EM_X86_64, // machine_code | |
309 | false, // has_make_symbol | |
310 | false, // has_resolve | |
311 | true, // has_code_fill | |
35cdfc9a | 312 | true, // is_default_stack_executable |
2e30d253 | 313 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 314 | 0x400000, // default_text_segment_address |
2e30d253 ILT |
315 | 0x1000, // abi_pagesize |
316 | 0x1000 // common_pagesize | |
317 | }; | |
318 | ||
319 | // Get the GOT section, creating it if necessary. | |
320 | ||
321 | Output_data_got<64, false>* | |
322 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
323 | { | |
324 | if (this->got_ == NULL) | |
325 | { | |
326 | gold_assert(symtab != NULL && layout != NULL); | |
327 | ||
328 | this->got_ = new Output_data_got<64, false>(); | |
329 | ||
330 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
331 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
332 | this->got_); | |
333 | ||
334 | // The old GNU linker creates a .got.plt section. We just | |
335 | // create another set of data in the .got section. Note that we | |
336 | // always create a PLT if we create a GOT, although the PLT | |
337 | // might be empty. | |
2e30d253 ILT |
338 | this->got_plt_ = new Output_data_space(8); |
339 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
340 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
341 | this->got_plt_); | |
342 | ||
343 | // The first three entries are reserved. | |
27bc2bce | 344 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
345 | |
346 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
347 | symtab->define_in_output_data(this, "_GLOBAL_OFFSET_TABLE_", NULL, | |
348 | this->got_plt_, | |
349 | 0, 0, elfcpp::STT_OBJECT, | |
350 | elfcpp::STB_LOCAL, | |
351 | elfcpp::STV_HIDDEN, 0, | |
352 | false, false); | |
353 | } | |
354 | ||
355 | return this->got_; | |
356 | } | |
357 | ||
358 | // Get the dynamic reloc section, creating it if necessary. | |
359 | ||
360 | Target_x86_64::Reloc_section* | |
0ffd9845 | 361 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 362 | { |
0ffd9845 | 363 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
364 | { |
365 | gold_assert(layout != NULL); | |
0ffd9845 | 366 | this->rela_dyn_ = new Reloc_section(); |
2e30d253 | 367 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 368 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 369 | } |
0ffd9845 | 370 | return this->rela_dyn_; |
2e30d253 ILT |
371 | } |
372 | ||
373 | // A class to handle the PLT data. | |
374 | ||
375 | class Output_data_plt_x86_64 : public Output_section_data | |
376 | { | |
377 | public: | |
378 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
379 | ||
380 | Output_data_plt_x86_64(Layout*, Output_data_space*); | |
381 | ||
382 | // Add an entry to the PLT. | |
383 | void | |
384 | add_entry(Symbol* gsym); | |
385 | ||
386 | // Return the .rel.plt section data. | |
387 | const Reloc_section* | |
388 | rel_plt() const | |
389 | { return this->rel_; } | |
390 | ||
391 | protected: | |
392 | void | |
393 | do_adjust_output_section(Output_section* os); | |
394 | ||
395 | private: | |
396 | // The size of an entry in the PLT. | |
397 | static const int plt_entry_size = 16; | |
398 | ||
399 | // The first entry in the PLT. | |
400 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
401 | // procedure linkage table for both programs and shared objects." | |
402 | static unsigned char first_plt_entry[plt_entry_size]; | |
403 | ||
404 | // Other entries in the PLT for an executable. | |
405 | static unsigned char plt_entry[plt_entry_size]; | |
406 | ||
407 | // Set the final size. | |
408 | void | |
27bc2bce | 409 | set_final_data_size() |
2e30d253 ILT |
410 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
411 | ||
412 | // Write out the PLT data. | |
413 | void | |
414 | do_write(Output_file*); | |
415 | ||
416 | // The reloc section. | |
417 | Reloc_section* rel_; | |
418 | // The .got.plt section. | |
419 | Output_data_space* got_plt_; | |
420 | // The number of PLT entries. | |
421 | unsigned int count_; | |
422 | }; | |
423 | ||
424 | // Create the PLT section. The ordinary .got section is an argument, | |
425 | // since we need to refer to the start. We also create our own .got | |
426 | // section just for PLT entries. | |
427 | ||
428 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
429 | Output_data_space* got_plt) | |
2e30d253 ILT |
430 | : Output_section_data(8), got_plt_(got_plt), count_(0) |
431 | { | |
432 | this->rel_ = new Reloc_section(); | |
433 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
434 | elfcpp::SHF_ALLOC, this->rel_); | |
435 | } | |
436 | ||
437 | void | |
438 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
439 | { | |
440 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
441 | // linker, and so do we. | |
442 | os->set_entsize(4); | |
443 | } | |
444 | ||
445 | // Add an entry to the PLT. | |
446 | ||
447 | void | |
448 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
449 | { | |
450 | gold_assert(!gsym->has_plt_offset()); | |
451 | ||
452 | // Note that when setting the PLT offset we skip the initial | |
453 | // reserved PLT entry. | |
454 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
455 | ||
456 | ++this->count_; | |
457 | ||
27bc2bce | 458 | off_t got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
459 | |
460 | // Every PLT entry needs a GOT entry which points back to the PLT | |
461 | // entry (this will be changed by the dynamic linker, normally | |
462 | // lazily when the function is called). | |
27bc2bce | 463 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
464 | |
465 | // Every PLT entry needs a reloc. | |
466 | gsym->set_needs_dynsym_entry(); | |
467 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
468 | got_offset, 0); | |
469 | ||
470 | // Note that we don't need to save the symbol. The contents of the | |
471 | // PLT are independent of which symbols are used. The symbols only | |
472 | // appear in the relocations. | |
473 | } | |
474 | ||
475 | // The first entry in the PLT for an executable. | |
476 | ||
477 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
478 | { | |
479 | // From AMD64 ABI Draft 0.98, page 76 | |
480 | 0xff, 0x35, // pushq contents of memory address | |
481 | 0, 0, 0, 0, // replaced with address of .got + 4 | |
482 | 0xff, 0x25, // jmp indirect | |
483 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
484 | 0x90, 0x90, 0x90, 0x90 // noop (x4) | |
485 | }; | |
486 | ||
487 | // Subsequent entries in the PLT for an executable. | |
488 | ||
489 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
490 | { | |
491 | // From AMD64 ABI Draft 0.98, page 76 | |
492 | 0xff, 0x25, // jmpq indirect | |
493 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
494 | 0x68, // pushq immediate | |
495 | 0, 0, 0, 0, // replaced with offset into relocation table | |
496 | 0xe9, // jmpq relative | |
497 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
498 | }; | |
499 | ||
500 | // Write out the PLT. This uses the hand-coded instructions above, | |
501 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
502 | ||
503 | void | |
504 | Output_data_plt_x86_64::do_write(Output_file* of) | |
505 | { | |
506 | const off_t offset = this->offset(); | |
507 | const off_t oview_size = this->data_size(); | |
508 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
509 | ||
510 | const off_t got_file_offset = this->got_plt_->offset(); | |
511 | const off_t got_size = this->got_plt_->data_size(); | |
512 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
513 | got_size); | |
514 | ||
515 | unsigned char* pov = oview; | |
516 | ||
517 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
518 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
519 | ||
520 | memcpy(pov, first_plt_entry, plt_entry_size); | |
521 | if (!parameters->output_is_shared()) | |
522 | { | |
523 | // We do a jmp relative to the PC at the end of this instruction. | |
524 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 8 | |
525 | - (plt_address + 6)); | |
526 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 16 | |
527 | - (plt_address + 12)); | |
528 | } | |
529 | pov += plt_entry_size; | |
530 | ||
531 | unsigned char* got_pov = got_view; | |
532 | ||
533 | memset(got_pov, 0, 24); | |
534 | got_pov += 24; | |
535 | ||
536 | unsigned int plt_offset = plt_entry_size; | |
537 | unsigned int got_offset = 24; | |
538 | const unsigned int count = this->count_; | |
539 | for (unsigned int plt_index = 0; | |
540 | plt_index < count; | |
541 | ++plt_index, | |
542 | pov += plt_entry_size, | |
543 | got_pov += 8, | |
544 | plt_offset += plt_entry_size, | |
545 | got_offset += 8) | |
546 | { | |
547 | // Set and adjust the PLT entry itself. | |
548 | memcpy(pov, plt_entry, plt_entry_size); | |
549 | if (parameters->output_is_shared()) | |
550 | // FIXME(csilvers): what's the right thing to write here? | |
551 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_offset); | |
552 | else | |
553 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
554 | (got_address + got_offset | |
555 | - (plt_address + plt_offset | |
556 | + 6))); | |
557 | ||
558 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
559 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
560 | - (plt_offset + plt_entry_size)); | |
561 | ||
562 | // Set the entry in the GOT. | |
563 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
564 | } | |
565 | ||
566 | gold_assert(pov - oview == oview_size); | |
567 | gold_assert(got_pov - got_view == got_size); | |
568 | ||
569 | of->write_output_view(offset, oview_size, oview); | |
570 | of->write_output_view(got_file_offset, got_size, got_view); | |
571 | } | |
572 | ||
573 | // Create a PLT entry for a global symbol. | |
574 | ||
575 | void | |
576 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
577 | Symbol* gsym) | |
578 | { | |
579 | if (gsym->has_plt_offset()) | |
580 | return; | |
581 | ||
582 | if (this->plt_ == NULL) | |
583 | { | |
584 | // Create the GOT sections first. | |
585 | this->got_section(symtab, layout); | |
586 | ||
587 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_plt_); | |
588 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
589 | (elfcpp::SHF_ALLOC | |
590 | | elfcpp::SHF_EXECINSTR), | |
591 | this->plt_); | |
592 | } | |
593 | ||
594 | this->plt_->add_entry(gsym); | |
595 | } | |
596 | ||
597 | // Handle a relocation against a non-function symbol defined in a | |
598 | // dynamic object. The traditional way to handle this is to generate | |
599 | // a COPY relocation to copy the variable at runtime from the shared | |
600 | // object into the executable's data segment. However, this is | |
601 | // undesirable in general, as if the size of the object changes in the | |
602 | // dynamic object, the executable will no longer work correctly. If | |
603 | // this relocation is in a writable section, then we can create a | |
604 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
605 | // address at runtime. However, we do not want do that if the | |
606 | // relocation is in a read-only section, as it would prevent the | |
607 | // readonly segment from being shared. And if we have to eventually | |
608 | // generate a COPY reloc, then any dynamic relocations will be | |
609 | // useless. So this means that if this is a writable section, we need | |
610 | // to save the relocation until we see whether we have to create a | |
611 | // COPY relocation for this symbol for any other relocation. | |
612 | ||
613 | void | |
614 | Target_x86_64::copy_reloc(const General_options* options, | |
d61c17ea ILT |
615 | Symbol_table* symtab, |
616 | Layout* layout, | |
617 | Sized_relobj<64, false>* object, | |
4f4c5f80 ILT |
618 | unsigned int data_shndx, |
619 | Output_section* output_section, | |
620 | Symbol* gsym, | |
72ec2876 | 621 | const elfcpp::Rela<64, false>& rela) |
2e30d253 ILT |
622 | { |
623 | Sized_symbol<64>* ssym; | |
624 | ssym = symtab->get_sized_symbol SELECT_SIZE_NAME(64) (gsym | |
625 | SELECT_SIZE(64)); | |
626 | ||
627 | if (!Copy_relocs<64, false>::need_copy_reloc(options, object, | |
628 | data_shndx, ssym)) | |
629 | { | |
630 | // So far we do not need a COPY reloc. Save this relocation. | |
631 | // If it turns out that we never need a COPY reloc for this | |
632 | // symbol, then we will emit the relocation. | |
633 | if (this->copy_relocs_ == NULL) | |
634 | this->copy_relocs_ = new Copy_relocs<64, false>(); | |
4f4c5f80 | 635 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rela); |
2e30d253 ILT |
636 | } |
637 | else | |
638 | { | |
639 | // Allocate space for this symbol in the .bss section. | |
640 | ||
641 | elfcpp::Elf_types<64>::Elf_WXword symsize = ssym->symsize(); | |
642 | ||
643 | // There is no defined way to determine the required alignment | |
644 | // of the symbol. We pick the alignment based on the size. We | |
645 | // set an arbitrary maximum of 256. | |
646 | unsigned int align; | |
647 | for (align = 1; align < 512; align <<= 1) | |
648 | if ((symsize & align) != 0) | |
649 | break; | |
650 | ||
651 | if (this->dynbss_ == NULL) | |
652 | { | |
653 | this->dynbss_ = new Output_data_space(align); | |
654 | layout->add_output_section_data(".bss", | |
655 | elfcpp::SHT_NOBITS, | |
656 | (elfcpp::SHF_ALLOC | |
657 | | elfcpp::SHF_WRITE), | |
658 | this->dynbss_); | |
659 | } | |
660 | ||
661 | Output_data_space* dynbss = this->dynbss_; | |
662 | ||
663 | if (align > dynbss->addralign()) | |
664 | dynbss->set_space_alignment(align); | |
665 | ||
27bc2bce | 666 | off_t dynbss_size = dynbss->current_data_size(); |
2e30d253 ILT |
667 | dynbss_size = align_address(dynbss_size, align); |
668 | off_t offset = dynbss_size; | |
27bc2bce | 669 | dynbss->set_current_data_size(dynbss_size + symsize); |
2e30d253 | 670 | |
46fe1623 | 671 | symtab->define_with_copy_reloc(this, ssym, dynbss, offset); |
2e30d253 ILT |
672 | |
673 | // Add the COPY reloc. | |
0ffd9845 ILT |
674 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
675 | rela_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0); | |
2e30d253 ILT |
676 | } |
677 | } | |
678 | ||
679 | ||
680 | // Optimize the TLS relocation type based on what we know about the | |
681 | // symbol. IS_FINAL is true if the final address of this symbol is | |
682 | // known at link time. | |
683 | ||
e041f13d | 684 | tls::Tls_optimization |
2e30d253 ILT |
685 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
686 | { | |
2e30d253 ILT |
687 | // If we are generating a shared library, then we can't do anything |
688 | // in the linker. | |
689 | if (parameters->output_is_shared()) | |
e041f13d | 690 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
691 | |
692 | switch (r_type) | |
693 | { | |
694 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
695 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
696 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
697 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
698 | // access. Since we know that we are generating an executable, |
699 | // we can convert this to Initial-Exec. If we also know that | |
700 | // this is a local symbol, we can further switch to Local-Exec. | |
701 | if (is_final) | |
e041f13d ILT |
702 | return tls::TLSOPT_TO_LE; |
703 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 704 | |
d61c17ea | 705 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
706 | // This is Local-Dynamic, which refers to a local symbol in the |
707 | // dynamic TLS block. Since we know that we generating an | |
708 | // executable, we can switch to Local-Exec. | |
e041f13d | 709 | return tls::TLSOPT_TO_LE; |
2e30d253 | 710 | |
0ffd9845 | 711 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
712 | case elfcpp::R_X86_64_DTPOFF64: |
713 | // Another Local-Dynamic reloc. | |
e041f13d | 714 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 715 | |
d61c17ea | 716 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
717 | // These are Initial-Exec relocs which get the thread offset |
718 | // from the GOT. If we know that we are linking against the | |
719 | // local symbol, we can switch to Local-Exec, which links the | |
720 | // thread offset into the instruction. | |
721 | if (is_final) | |
e041f13d ILT |
722 | return tls::TLSOPT_TO_LE; |
723 | return tls::TLSOPT_NONE; | |
2e30d253 | 724 | |
d61c17ea | 725 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
726 | // When we already have Local-Exec, there is nothing further we |
727 | // can do. | |
e041f13d | 728 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
729 | |
730 | default: | |
731 | gold_unreachable(); | |
732 | } | |
2e30d253 ILT |
733 | } |
734 | ||
e041f13d ILT |
735 | // Report an unsupported relocation against a local symbol. |
736 | ||
737 | void | |
738 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
739 | unsigned int r_type) | |
740 | { | |
75f2446e ILT |
741 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
742 | object->name().c_str(), r_type); | |
e041f13d ILT |
743 | } |
744 | ||
2e30d253 ILT |
745 | // Scan a relocation for a local symbol. |
746 | ||
747 | inline void | |
748 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
749 | Symbol_table* symtab, |
750 | Layout* layout, | |
751 | Target_x86_64* target, | |
752 | Sized_relobj<64, false>* object, | |
0ffd9845 | 753 | unsigned int data_shndx, |
4f4c5f80 | 754 | Output_section* output_section, |
0ffd9845 | 755 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 756 | unsigned int r_type, |
7bf1f802 | 757 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
758 | { |
759 | switch (r_type) | |
760 | { | |
761 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
762 | case elfcpp::R_386_GNU_VTINHERIT: |
763 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
764 | break; |
765 | ||
766 | case elfcpp::R_X86_64_64: | |
d61c6bd4 ILT |
767 | // If building a shared library (or a position-independent |
768 | // executable), we need to create a dynamic relocation for | |
769 | // this location. The relocation applied at link time will | |
770 | // apply the link-time value, so we flag the location with | |
771 | // an R_386_RELATIVE relocation so the dynamic loader can | |
772 | // relocate it easily. | |
773 | if (parameters->output_is_position_independent()) | |
774 | { | |
775 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
776 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE, | |
4f4c5f80 ILT |
777 | output_section, data_shndx, |
778 | reloc.get_r_offset(), 0); | |
d61c6bd4 ILT |
779 | } |
780 | break; | |
781 | ||
2e30d253 ILT |
782 | case elfcpp::R_X86_64_32: |
783 | case elfcpp::R_X86_64_32S: | |
784 | case elfcpp::R_X86_64_16: | |
785 | case elfcpp::R_X86_64_8: | |
96f2030e ILT |
786 | // If building a shared library (or a position-independent |
787 | // executable), we need to create a dynamic relocation for | |
788 | // this location. The relocation applied at link time will | |
789 | // apply the link-time value, so we flag the location with | |
790 | // an R_386_RELATIVE relocation so the dynamic loader can | |
791 | // relocate it easily. | |
792 | if (parameters->output_is_position_independent()) | |
793 | { | |
96f2030e | 794 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d61c6bd4 | 795 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
4f4c5f80 ILT |
796 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
797 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 | 798 | reloc.get_r_addend()); |
96f2030e | 799 | } |
2e30d253 ILT |
800 | break; |
801 | ||
802 | case elfcpp::R_X86_64_PC64: | |
803 | case elfcpp::R_X86_64_PC32: | |
804 | case elfcpp::R_X86_64_PC16: | |
805 | case elfcpp::R_X86_64_PC8: | |
806 | break; | |
807 | ||
f389a824 ILT |
808 | case elfcpp::R_X86_64_PLT32: |
809 | // Since we know this is a local symbol, we can handle this as a | |
810 | // PC32 reloc. | |
811 | break; | |
812 | ||
fdc2f80f | 813 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 814 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
815 | case elfcpp::R_X86_64_GOTPC64: |
816 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
817 | // We need a GOT section. |
818 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
819 | // For PLTOFF64, we'd normally want a PLT section, but since we |
820 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
821 | break; |
822 | ||
0ffd9845 ILT |
823 | case elfcpp::R_X86_64_GOT64: |
824 | case elfcpp::R_X86_64_GOT32: | |
825 | case elfcpp::R_X86_64_GOTPCREL64: | |
826 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 827 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
828 | { |
829 | // The symbol requires a GOT entry. | |
830 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
831 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
832 | if (got->add_local(object, r_sym)) | |
833 | { | |
834 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 835 | // dynamic relocation for this symbol's GOT entry. |
96f2030e | 836 | if (parameters->output_is_position_independent()) |
0ffd9845 ILT |
837 | { |
838 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
839 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
840 | if (r_type != elfcpp::R_X86_64_GOT32) | |
841 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE, | |
842 | got, object->local_got_offset(r_sym), 0); | |
843 | else | |
844 | rela_dyn->add_local(object, r_sym, r_type, | |
845 | got, object->local_got_offset(r_sym), 0); | |
0ffd9845 ILT |
846 | } |
847 | } | |
ee9e9e86 ILT |
848 | // For GOTPLT64, we'd normally want a PLT section, but since |
849 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
850 | } |
851 | break; | |
852 | ||
2e30d253 ILT |
853 | case elfcpp::R_X86_64_COPY: |
854 | case elfcpp::R_X86_64_GLOB_DAT: | |
855 | case elfcpp::R_X86_64_JUMP_SLOT: | |
856 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 857 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 858 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 859 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 860 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
861 | gold_error(_("%s: unexpected reloc %u in object file"), |
862 | object->name().c_str(), r_type); | |
2e30d253 ILT |
863 | break; |
864 | ||
d61c17ea | 865 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
866 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
867 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 868 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 869 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
870 | case elfcpp::R_X86_64_DTPOFF32: |
871 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
872 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
873 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
874 | { |
875 | bool output_is_shared = parameters->output_is_shared(); | |
e041f13d ILT |
876 | const tls::Tls_optimization optimized_type |
877 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
878 | switch (r_type) |
879 | { | |
56622147 | 880 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
881 | if (optimized_type == tls::TLSOPT_NONE) |
882 | { | |
883 | // Create a pair of GOT entries for the module index and | |
884 | // dtv-relative offset. | |
885 | Output_data_got<64, false>* got | |
886 | = target->got_section(symtab, layout); | |
887 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
888 | got->add_local_tls_with_rela(object, r_sym, | |
889 | lsym.get_st_shndx(), true, | |
890 | target->rela_dyn_section(layout), | |
891 | elfcpp::R_X86_64_DTPMOD64); | |
892 | } | |
893 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
894 | unsupported_reloc_local(object, r_type); | |
895 | break; | |
896 | ||
56622147 ILT |
897 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
898 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
899 | // FIXME: If not relaxing to LE, we need to generate | |
7bf1f802 | 900 | // a GOT entry with a R_x86_64_TLSDESC reloc. |
56622147 ILT |
901 | if (optimized_type != tls::TLSOPT_TO_LE) |
902 | unsupported_reloc_local(object, r_type); | |
2e30d253 ILT |
903 | break; |
904 | ||
e041f13d | 905 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
906 | if (optimized_type == tls::TLSOPT_NONE) |
907 | { | |
908 | // Create a GOT entry for the module index. | |
909 | Output_data_got<64, false>* got | |
910 | = target->got_section(symtab, layout); | |
911 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
912 | got->add_local_tls_with_rela(object, r_sym, | |
913 | lsym.get_st_shndx(), false, | |
914 | target->rela_dyn_section(layout), | |
915 | elfcpp::R_X86_64_DTPMOD64); | |
916 | } | |
917 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
918 | unsupported_reloc_local(object, r_type); | |
919 | break; | |
920 | ||
0ffd9845 ILT |
921 | case elfcpp::R_X86_64_DTPOFF32: |
922 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
923 | break; |
924 | ||
56622147 | 925 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
7bf1f802 ILT |
926 | if (optimized_type == tls::TLSOPT_NONE) |
927 | { | |
928 | // Create a GOT entry for the tp-relative offset. | |
929 | Output_data_got<64, false>* got | |
930 | = target->got_section(symtab, layout); | |
931 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
932 | got->add_local_with_rela(object, r_sym, | |
933 | target->rela_dyn_section(layout), | |
934 | elfcpp::R_X86_64_TPOFF64); | |
935 | } | |
936 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
937 | unsupported_reloc_local(object, r_type); |
938 | break; | |
0ffd9845 | 939 | |
56622147 | 940 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
7bf1f802 ILT |
941 | if (output_is_shared) |
942 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 943 | break; |
e041f13d ILT |
944 | |
945 | default: | |
946 | gold_unreachable(); | |
2e30d253 ILT |
947 | } |
948 | } | |
949 | break; | |
2e30d253 | 950 | |
fdc2f80f ILT |
951 | case elfcpp::R_X86_64_SIZE32: |
952 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 953 | default: |
75f2446e ILT |
954 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
955 | object->name().c_str(), r_type); | |
2e30d253 ILT |
956 | break; |
957 | } | |
958 | } | |
959 | ||
960 | ||
e041f13d ILT |
961 | // Report an unsupported relocation against a global symbol. |
962 | ||
963 | void | |
964 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
965 | unsigned int r_type, | |
966 | Symbol* gsym) | |
967 | { | |
75f2446e | 968 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 969 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
970 | } |
971 | ||
2e30d253 ILT |
972 | // Scan a relocation for a global symbol. |
973 | ||
974 | inline void | |
975 | Target_x86_64::Scan::global(const General_options& options, | |
d61c17ea ILT |
976 | Symbol_table* symtab, |
977 | Layout* layout, | |
978 | Target_x86_64* target, | |
979 | Sized_relobj<64, false>* object, | |
980 | unsigned int data_shndx, | |
4f4c5f80 | 981 | Output_section* output_section, |
d61c17ea ILT |
982 | const elfcpp::Rela<64, false>& reloc, |
983 | unsigned int r_type, | |
984 | Symbol* gsym) | |
2e30d253 ILT |
985 | { |
986 | switch (r_type) | |
987 | { | |
988 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
989 | case elfcpp::R_386_GNU_VTINHERIT: |
990 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
991 | break; |
992 | ||
993 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
994 | case elfcpp::R_X86_64_32: |
995 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 996 | case elfcpp::R_X86_64_16: |
2e30d253 | 997 | case elfcpp::R_X86_64_8: |
96f2030e | 998 | { |
d61c6bd4 ILT |
999 | // Make a PLT entry if necessary. |
1000 | if (gsym->needs_plt_entry()) | |
1001 | { | |
1002 | target->make_plt_entry(symtab, layout, gsym); | |
1003 | // Since this is not a PC-relative relocation, we may be | |
1004 | // taking the address of a function. In that case we need to | |
1005 | // set the entry in the dynamic symbol table to the address of | |
1006 | // the PLT entry. | |
1007 | if (gsym->is_from_dynobj()) | |
1008 | gsym->set_needs_dynsym_value(); | |
1009 | } | |
1010 | // Make a dynamic relocation if necessary. | |
1011 | if (gsym->needs_dynamic_reloc(true, false)) | |
1012 | { | |
1013 | if (target->may_need_copy_reloc(gsym)) | |
1014 | { | |
7bf1f802 ILT |
1015 | target->copy_reloc(&options, symtab, layout, object, |
1016 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 ILT |
1017 | } |
1018 | else if (r_type == elfcpp::R_X86_64_64 | |
1019 | && gsym->can_use_relative_reloc(false)) | |
1020 | { | |
1021 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1022 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE, | |
4f4c5f80 | 1023 | output_section, data_shndx, |
d61c6bd4 ILT |
1024 | reloc.get_r_offset(), 0); |
1025 | } | |
1026 | else | |
1027 | { | |
96f2030e | 1028 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1029 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1030 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1031 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1032 | } |
1033 | } | |
1034 | } | |
1035 | break; | |
1036 | ||
1037 | case elfcpp::R_X86_64_PC64: | |
1038 | case elfcpp::R_X86_64_PC32: | |
1039 | case elfcpp::R_X86_64_PC16: | |
1040 | case elfcpp::R_X86_64_PC8: | |
1041 | { | |
1042 | // Make a PLT entry if necessary. | |
1043 | if (gsym->needs_plt_entry()) | |
1044 | target->make_plt_entry(symtab, layout, gsym); | |
1045 | // Make a dynamic relocation if necessary. | |
1046 | bool is_function_call = (gsym->type() == elfcpp::STT_FUNC); | |
1047 | if (gsym->needs_dynamic_reloc(true, is_function_call)) | |
86849f1f | 1048 | { |
d61c6bd4 ILT |
1049 | if (target->may_need_copy_reloc(gsym)) |
1050 | { | |
7bf1f802 ILT |
1051 | target->copy_reloc(&options, symtab, layout, object, |
1052 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 | 1053 | } |
86849f1f | 1054 | else |
d61c6bd4 ILT |
1055 | { |
1056 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
4f4c5f80 ILT |
1057 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1058 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1059 | reloc.get_r_addend()); |
1060 | } | |
86849f1f | 1061 | } |
d61c6bd4 | 1062 | } |
2e30d253 ILT |
1063 | break; |
1064 | ||
ff006520 | 1065 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1066 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1067 | case elfcpp::R_X86_64_GOTPCREL64: |
1068 | case elfcpp::R_X86_64_GOTPCREL: | |
1069 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1070 | { |
1071 | // The symbol requires a GOT entry. | |
1072 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 ILT |
1073 | if (gsym->final_value_is_known()) |
1074 | got->add_global(gsym); | |
1075 | else | |
1076 | { | |
2e30d253 ILT |
1077 | // If this symbol is not fully resolved, we need to add a |
1078 | // dynamic relocation for it. | |
7bf1f802 ILT |
1079 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
1080 | if (gsym->is_from_dynobj() || gsym->is_preemptible()) | |
1081 | got->add_global_with_rela(gsym, rela_dyn, | |
1082 | elfcpp::R_X86_64_GLOB_DAT); | |
1083 | else | |
2e30d253 | 1084 | { |
7bf1f802 | 1085 | if (got->add_global(gsym)) |
d61c6bd4 ILT |
1086 | { |
1087 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_RELATIVE, | |
1088 | got, gsym->got_offset(), 0); | |
1089 | // Make sure we write the link-time value to the GOT. | |
1090 | gsym->set_needs_value_in_got(); | |
1091 | } | |
2e30d253 ILT |
1092 | } |
1093 | } | |
ee9e9e86 ILT |
1094 | // For GOTPLT64, we also need a PLT entry (but only if the |
1095 | // symbol is not fully resolved). | |
1096 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1097 | && !gsym->final_value_is_known()) | |
1098 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1099 | } |
1100 | break; | |
1101 | ||
1102 | case elfcpp::R_X86_64_PLT32: | |
1103 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1104 | // Otherwise we need a PLT entry. | |
1105 | if (gsym->final_value_is_known()) | |
1106 | break; | |
96f2030e ILT |
1107 | // If building a shared library, we can also skip the PLT entry |
1108 | // if the symbol is defined in the output file and is protected | |
1109 | // or hidden. | |
1110 | if (gsym->is_defined() | |
1111 | && !gsym->is_from_dynobj() | |
1112 | && !gsym->is_preemptible()) | |
1113 | break; | |
2e30d253 ILT |
1114 | target->make_plt_entry(symtab, layout, gsym); |
1115 | break; | |
1116 | ||
fdc2f80f | 1117 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1118 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1119 | case elfcpp::R_X86_64_GOTPC64: |
1120 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1121 | // We need a GOT section. |
1122 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1123 | // For PLTOFF64, we also need a PLT entry (but only if the |
1124 | // symbol is not fully resolved). | |
1125 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1126 | && !gsym->final_value_is_known()) | |
1127 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1128 | break; |
1129 | ||
2e30d253 ILT |
1130 | case elfcpp::R_X86_64_COPY: |
1131 | case elfcpp::R_X86_64_GLOB_DAT: | |
1132 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1133 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1134 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1135 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1136 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1137 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1138 | gold_error(_("%s: unexpected reloc %u in object file"), |
1139 | object->name().c_str(), r_type); | |
2e30d253 | 1140 | break; |
2e30d253 | 1141 | |
d61c17ea | 1142 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1143 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1144 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1145 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1146 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1147 | case elfcpp::R_X86_64_DTPOFF32: |
1148 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1149 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1150 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1151 | { |
1152 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1153 | const tls::Tls_optimization optimized_type |
1154 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1155 | switch (r_type) |
1156 | { | |
56622147 | 1157 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1158 | if (optimized_type == tls::TLSOPT_NONE) |
1159 | { | |
1160 | // Create a pair of GOT entries for the module index and | |
1161 | // dtv-relative offset. | |
1162 | Output_data_got<64, false>* got | |
1163 | = target->got_section(symtab, layout); | |
1164 | got->add_global_tls_with_rela(gsym, | |
1165 | target->rela_dyn_section(layout), | |
1166 | elfcpp::R_X86_64_DTPMOD64, | |
1167 | elfcpp::R_X86_64_DTPOFF64); | |
1168 | } | |
1169 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1170 | { | |
1171 | // Create a GOT entry for the tp-relative offset. | |
1172 | Output_data_got<64, false>* got | |
1173 | = target->got_section(symtab, layout); | |
1174 | got->add_global_with_rela(gsym, | |
1175 | target->rela_dyn_section(layout), | |
1176 | elfcpp::R_X86_64_TPOFF64); | |
1177 | } | |
1178 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1179 | unsupported_reloc_global(object, r_type, gsym); | |
1180 | break; | |
1181 | ||
56622147 ILT |
1182 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1183 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1184 | // FIXME: If not relaxing to LE, we need to generate | |
1185 | // DTPMOD64 and DTPOFF64, or TLSDESC, relocs. | |
1186 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1187 | unsupported_reloc_global(object, r_type, gsym); | |
2e30d253 ILT |
1188 | break; |
1189 | ||
e041f13d | 1190 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1191 | if (optimized_type == tls::TLSOPT_NONE) |
1192 | { | |
1193 | // Create a GOT entry for the module index. | |
1194 | Output_data_got<64, false>* got | |
1195 | = target->got_section(symtab, layout); | |
1196 | got->add_global_tls_with_rela(gsym, | |
1197 | target->rela_dyn_section(layout), | |
1198 | elfcpp::R_X86_64_DTPMOD64); | |
1199 | } | |
1200 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1201 | unsupported_reloc_global(object, r_type, gsym); | |
1202 | break; | |
1203 | ||
0ffd9845 ILT |
1204 | case elfcpp::R_X86_64_DTPOFF32: |
1205 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1206 | break; |
1207 | ||
56622147 | 1208 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
7bf1f802 ILT |
1209 | if (optimized_type == tls::TLSOPT_NONE) |
1210 | { | |
1211 | // Create a GOT entry for the tp-relative offset. | |
1212 | Output_data_got<64, false>* got | |
1213 | = target->got_section(symtab, layout); | |
1214 | got->add_global_with_rela(gsym, | |
1215 | target->rela_dyn_section(layout), | |
1216 | elfcpp::R_X86_64_TPOFF64); | |
1217 | } | |
1218 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1219 | unsupported_reloc_global(object, r_type, gsym); |
1220 | break; | |
0ffd9845 | 1221 | |
56622147 | 1222 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
7bf1f802 ILT |
1223 | if (parameters->output_is_shared()) |
1224 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1225 | break; |
e041f13d ILT |
1226 | |
1227 | default: | |
1228 | gold_unreachable(); | |
2e30d253 ILT |
1229 | } |
1230 | } | |
1231 | break; | |
fdc2f80f ILT |
1232 | |
1233 | case elfcpp::R_X86_64_SIZE32: | |
1234 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1235 | default: |
75f2446e | 1236 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1237 | object->name().c_str(), r_type, |
1238 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1239 | break; |
1240 | } | |
1241 | } | |
1242 | ||
1243 | // Scan relocations for a section. | |
1244 | ||
1245 | void | |
1246 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1247 | Symbol_table* symtab, |
1248 | Layout* layout, | |
1249 | Sized_relobj<64, false>* object, | |
1250 | unsigned int data_shndx, | |
1251 | unsigned int sh_type, | |
1252 | const unsigned char* prelocs, | |
1253 | size_t reloc_count, | |
730cdc88 ILT |
1254 | Output_section* output_section, |
1255 | bool needs_special_offset_handling, | |
d61c17ea | 1256 | size_t local_symbol_count, |
730cdc88 | 1257 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1258 | { |
1259 | if (sh_type == elfcpp::SHT_REL) | |
1260 | { | |
75f2446e ILT |
1261 | gold_error(_("%s: unsupported REL reloc section"), |
1262 | object->name().c_str()); | |
1263 | return; | |
2e30d253 ILT |
1264 | } |
1265 | ||
1266 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1267 | Target_x86_64::Scan>( | |
1268 | options, | |
1269 | symtab, | |
1270 | layout, | |
1271 | this, | |
1272 | object, | |
1273 | data_shndx, | |
1274 | prelocs, | |
1275 | reloc_count, | |
730cdc88 ILT |
1276 | output_section, |
1277 | needs_special_offset_handling, | |
2e30d253 | 1278 | local_symbol_count, |
730cdc88 | 1279 | plocal_symbols); |
2e30d253 ILT |
1280 | } |
1281 | ||
1282 | // Finalize the sections. | |
1283 | ||
1284 | void | |
1285 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1286 | { | |
1287 | // Fill in some more dynamic tags. | |
1288 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1289 | if (odyn != NULL) | |
1290 | { | |
1291 | if (this->got_plt_ != NULL) | |
1292 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1293 | ||
1294 | if (this->plt_ != NULL) | |
1295 | { | |
1296 | const Output_data* od = this->plt_->rel_plt(); | |
1297 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1298 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1299 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
1300 | } | |
1301 | ||
0ffd9845 | 1302 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1303 | { |
0ffd9845 | 1304 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1305 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1306 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1307 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1308 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1309 | } |
1310 | ||
1311 | if (!parameters->output_is_shared()) | |
1312 | { | |
1313 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1314 | // linker at run time, and used by the debugger. | |
1315 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1320 | // relocs. | |
1321 | if (this->copy_relocs_ == NULL) | |
1322 | return; | |
1323 | if (this->copy_relocs_->any_to_emit()) | |
1324 | { | |
0ffd9845 ILT |
1325 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
1326 | this->copy_relocs_->emit(rela_dyn); | |
2e30d253 ILT |
1327 | } |
1328 | delete this->copy_relocs_; | |
1329 | this->copy_relocs_ = NULL; | |
1330 | } | |
1331 | ||
1332 | // Perform a relocation. | |
1333 | ||
1334 | inline bool | |
1335 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1336 | Target_x86_64* target, | |
1337 | size_t relnum, | |
0ffd9845 | 1338 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1339 | unsigned int r_type, |
1340 | const Sized_symbol<64>* gsym, | |
1341 | const Symbol_value<64>* psymval, | |
1342 | unsigned char* view, | |
1343 | elfcpp::Elf_types<64>::Elf_Addr address, | |
1344 | off_t view_size) | |
1345 | { | |
1346 | if (this->skip_call_tls_get_addr_) | |
1347 | { | |
1348 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1349 | || gsym == NULL | |
0ffd9845 | 1350 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1351 | { |
75f2446e ILT |
1352 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1353 | _("missing expected TLS relocation")); | |
1354 | } | |
1355 | else | |
1356 | { | |
1357 | this->skip_call_tls_get_addr_ = false; | |
1358 | return false; | |
2e30d253 | 1359 | } |
2e30d253 ILT |
1360 | } |
1361 | ||
1362 | // Pick the value to use for symbols defined in shared objects. | |
1363 | Symbol_value<64> symval; | |
96f2030e ILT |
1364 | if (gsym != NULL |
1365 | && (gsym->is_from_dynobj() | |
1366 | || (parameters->output_is_shared() | |
1367 | && gsym->is_preemptible())) | |
1368 | && gsym->has_plt_offset()) | |
2e30d253 ILT |
1369 | { |
1370 | symval.set_output_value(target->plt_section()->address() | |
1371 | + gsym->plt_offset()); | |
1372 | psymval = &symval; | |
1373 | } | |
1374 | ||
1375 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1376 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1377 | ||
1378 | // Get the GOT offset if needed. | |
96f2030e ILT |
1379 | // The GOT pointer points to the end of the GOT section. |
1380 | // We need to subtract the size of the GOT section to get | |
1381 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1382 | bool have_got_offset = false; |
1383 | unsigned int got_offset = 0; | |
1384 | switch (r_type) | |
1385 | { | |
1386 | case elfcpp::R_X86_64_GOT32: | |
1387 | case elfcpp::R_X86_64_GOT64: | |
1388 | case elfcpp::R_X86_64_GOTPLT64: | |
1389 | case elfcpp::R_X86_64_GOTPCREL: | |
1390 | case elfcpp::R_X86_64_GOTPCREL64: | |
1391 | if (gsym != NULL) | |
1392 | { | |
1393 | gold_assert(gsym->has_got_offset()); | |
96f2030e | 1394 | got_offset = gsym->got_offset() - target->got_size(); |
0ffd9845 ILT |
1395 | } |
1396 | else | |
1397 | { | |
1398 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
7bf1f802 | 1399 | gold_assert(object->local_has_got_offset(r_sym)); |
96f2030e | 1400 | got_offset = object->local_got_offset(r_sym) - target->got_size(); |
0ffd9845 ILT |
1401 | } |
1402 | have_got_offset = true; | |
1403 | break; | |
1404 | ||
1405 | default: | |
1406 | break; | |
1407 | } | |
2e30d253 ILT |
1408 | |
1409 | switch (r_type) | |
1410 | { | |
1411 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1412 | case elfcpp::R_386_GNU_VTINHERIT: |
1413 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1414 | break; |
1415 | ||
1416 | case elfcpp::R_X86_64_64: | |
1417 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1418 | break; | |
1419 | ||
1420 | case elfcpp::R_X86_64_PC64: | |
1421 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1422 | address); | |
1423 | break; | |
1424 | ||
1425 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1426 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1427 | // uint64_t x = value + addend; | |
1428 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1429 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1430 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1431 | break; | |
1432 | ||
1433 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1434 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1435 | // int64_t x = value + addend; // note this quantity is signed! | |
1436 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1437 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1438 | break; | |
1439 | ||
1440 | case elfcpp::R_X86_64_PC32: | |
1441 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1442 | address); | |
1443 | break; | |
1444 | ||
1445 | case elfcpp::R_X86_64_16: | |
1446 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1447 | break; | |
1448 | ||
1449 | case elfcpp::R_X86_64_PC16: | |
1450 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1451 | address); | |
1452 | break; | |
1453 | ||
1454 | case elfcpp::R_X86_64_8: | |
1455 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1456 | break; | |
1457 | ||
1458 | case elfcpp::R_X86_64_PC8: | |
1459 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1460 | address); | |
1461 | break; | |
1462 | ||
1463 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1464 | gold_assert(gsym == NULL |
1465 | || gsym->has_plt_offset() | |
2e30d253 | 1466 | || gsym->final_value_is_known()); |
ee9e9e86 ILT |
1467 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1468 | // behaves differently because psymval was set to point to | |
1469 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1470 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1471 | address); | |
1472 | break; | |
1473 | ||
ee9e9e86 ILT |
1474 | case elfcpp::R_X86_64_PLTOFF64: |
1475 | { | |
1476 | gold_assert(gsym); | |
1477 | gold_assert(gsym->has_plt_offset() | |
1478 | || gsym->final_value_is_known()); | |
1479 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1480 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1481 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1482 | addend - got_address); | |
ee9e9e86 ILT |
1483 | } |
1484 | ||
2e30d253 | 1485 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1486 | gold_assert(have_got_offset); |
1487 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1488 | break; |
1489 | ||
e822f2b1 ILT |
1490 | case elfcpp::R_X86_64_GOTPC32: |
1491 | { | |
1492 | gold_assert(gsym); | |
1493 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1494 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1495 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1496 | } | |
1497 | break; | |
1498 | ||
1499 | case elfcpp::R_X86_64_GOT64: | |
1500 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1501 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1502 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1503 | gold_assert(have_got_offset); |
1504 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1505 | break; |
1506 | ||
1507 | case elfcpp::R_X86_64_GOTPC64: | |
1508 | { | |
1509 | gold_assert(gsym); | |
1510 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1511 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1512 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1513 | } | |
1514 | break; | |
1515 | ||
2e30d253 ILT |
1516 | case elfcpp::R_X86_64_GOTOFF64: |
1517 | { | |
1518 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1519 | value = (psymval->value(object, 0) | |
96f2030e | 1520 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1521 | Relocate_functions<64, false>::rela64(view, value, addend); |
1522 | } | |
1523 | break; | |
1524 | ||
1525 | case elfcpp::R_X86_64_GOTPCREL: | |
1526 | { | |
0ffd9845 ILT |
1527 | gold_assert(have_got_offset); |
1528 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1529 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1530 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1531 | } |
1532 | break; | |
1533 | ||
e822f2b1 ILT |
1534 | case elfcpp::R_X86_64_GOTPCREL64: |
1535 | { | |
0ffd9845 ILT |
1536 | gold_assert(have_got_offset); |
1537 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1538 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1539 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1540 | } |
1541 | break; | |
1542 | ||
2e30d253 ILT |
1543 | case elfcpp::R_X86_64_COPY: |
1544 | case elfcpp::R_X86_64_GLOB_DAT: | |
1545 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1546 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1547 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1548 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1549 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1550 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1551 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1552 | _("unexpected reloc %u in object file"), | |
1553 | r_type); | |
2e30d253 ILT |
1554 | break; |
1555 | ||
d61c17ea | 1556 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1557 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1558 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1559 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1560 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1561 | case elfcpp::R_X86_64_DTPOFF32: |
1562 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1563 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1564 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1565 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1566 | view, address, view_size); | |
2e30d253 | 1567 | break; |
2e30d253 | 1568 | |
fdc2f80f ILT |
1569 | case elfcpp::R_X86_64_SIZE32: |
1570 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1571 | default: |
75f2446e ILT |
1572 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1573 | _("unsupported reloc %u"), | |
1574 | r_type); | |
2e30d253 ILT |
1575 | break; |
1576 | } | |
1577 | ||
1578 | return true; | |
1579 | } | |
1580 | ||
1581 | // Perform a TLS relocation. | |
1582 | ||
1583 | inline void | |
d61c17ea | 1584 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1585 | Target_x86_64* target, |
d61c17ea | 1586 | size_t relnum, |
72ec2876 | 1587 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1588 | unsigned int r_type, |
1589 | const Sized_symbol<64>* gsym, | |
1590 | const Symbol_value<64>* psymval, | |
1591 | unsigned char* view, | |
2e30d253 | 1592 | elfcpp::Elf_types<64>::Elf_Addr, |
d61c17ea | 1593 | off_t view_size) |
2e30d253 | 1594 | { |
2e30d253 | 1595 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1596 | |
1597 | const Sized_relobj<64, false>* object = relinfo->object; | |
2e30d253 ILT |
1598 | |
1599 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1600 | ||
1601 | const bool is_final = (gsym == NULL | |
96f2030e | 1602 | ? !parameters->output_is_position_independent() |
2e30d253 | 1603 | : gsym->final_value_is_known()); |
e041f13d ILT |
1604 | const tls::Tls_optimization optimized_type |
1605 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1606 | switch (r_type) |
1607 | { | |
56622147 ILT |
1608 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1609 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d ILT |
1610 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1611 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2e30d253 | 1612 | { |
7bf1f802 | 1613 | gold_assert(tls_segment != NULL); |
2e30d253 | 1614 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1615 | rela, r_type, value, view, |
2e30d253 ILT |
1616 | view_size); |
1617 | break; | |
1618 | } | |
7bf1f802 ILT |
1619 | else |
1620 | { | |
1621 | unsigned int got_offset; | |
1622 | if (gsym != NULL) | |
1623 | { | |
1624 | gold_assert(gsym->has_tls_got_offset(true)); | |
1625 | got_offset = gsym->tls_got_offset(true) - target->got_size(); | |
1626 | } | |
1627 | else | |
1628 | { | |
1629 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
1630 | gold_assert(object->local_has_tls_got_offset(r_sym, true)); | |
1631 | got_offset = (object->local_tls_got_offset(r_sym, true) | |
1632 | - target->got_size()); | |
1633 | } | |
1634 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1635 | { | |
1636 | gold_assert(tls_segment != NULL); | |
1637 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
1638 | got_offset, view, view_size); | |
1639 | break; | |
1640 | } | |
1641 | else if (optimized_type == tls::TLSOPT_NONE) | |
1642 | { | |
1643 | // Relocate the field with the offset of the pair of GOT | |
1644 | // entries. | |
1645 | Relocate_functions<64, false>::rel64(view, got_offset); | |
1646 | break; | |
1647 | } | |
1648 | } | |
72ec2876 | 1649 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1650 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1651 | break; |
1652 | ||
56622147 | 1653 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
e041f13d ILT |
1654 | if (optimized_type == tls::TLSOPT_TO_LE) |
1655 | { | |
7bf1f802 | 1656 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
1657 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
1658 | value, view, view_size); | |
1659 | break; | |
e041f13d | 1660 | } |
7bf1f802 ILT |
1661 | else if (optimized_type == tls::TLSOPT_NONE) |
1662 | { | |
1663 | // Relocate the field with the offset of the GOT entry for | |
1664 | // the module index. | |
1665 | unsigned int got_offset; | |
1666 | if (gsym != NULL) | |
1667 | { | |
1668 | gold_assert(gsym->has_tls_got_offset(false)); | |
1669 | got_offset = gsym->tls_got_offset(false) - target->got_size(); | |
1670 | } | |
1671 | else | |
1672 | { | |
1673 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
1674 | gold_assert(object->local_has_tls_got_offset(r_sym, false)); | |
1675 | got_offset = (object->local_tls_got_offset(r_sym, false) | |
1676 | - target->got_size()); | |
1677 | } | |
1678 | Relocate_functions<64, false>::rel64(view, got_offset); | |
1679 | break; | |
1680 | } | |
72ec2876 | 1681 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1682 | _("unsupported reloc %u"), r_type); |
2e30d253 | 1683 | break; |
0ffd9845 ILT |
1684 | |
1685 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 1686 | gold_assert(tls_segment != NULL); |
e041f13d | 1687 | if (optimized_type == tls::TLSOPT_TO_LE) |
0ffd9845 ILT |
1688 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); |
1689 | else | |
1690 | value = value - tls_segment->vaddr(); | |
1691 | Relocate_functions<64, false>::rel32(view, value); | |
1692 | break; | |
1693 | ||
1694 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 1695 | gold_assert(tls_segment != NULL); |
e041f13d | 1696 | if (optimized_type == tls::TLSOPT_TO_LE) |
0ffd9845 ILT |
1697 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); |
1698 | else | |
1699 | value = value - tls_segment->vaddr(); | |
1700 | Relocate_functions<64, false>::rel64(view, value); | |
1701 | break; | |
2e30d253 | 1702 | |
56622147 ILT |
1703 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1704 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1705 | { | |
7bf1f802 | 1706 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1707 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1708 | rela, r_type, value, view, | |
1709 | view_size); | |
1710 | break; | |
1711 | } | |
7bf1f802 ILT |
1712 | else if (optimized_type == tls::TLSOPT_NONE) |
1713 | { | |
1714 | // Relocate the field with the offset of the GOT entry for | |
1715 | // the tp-relative offset of the symbol. | |
1716 | unsigned int got_offset; | |
1717 | if (gsym != NULL) | |
1718 | { | |
1719 | gold_assert(gsym->has_got_offset()); | |
1720 | got_offset = gsym->got_offset() - target->got_size(); | |
1721 | } | |
1722 | else | |
1723 | { | |
1724 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
1725 | gold_assert(object->local_has_got_offset(r_sym)); | |
1726 | got_offset = (object->local_got_offset(r_sym) | |
1727 | - target->got_size()); | |
1728 | } | |
1729 | Relocate_functions<64, false>::rel64(view, got_offset); | |
1730 | break; | |
1731 | } | |
56622147 ILT |
1732 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1733 | _("unsupported reloc type %u"), | |
1734 | r_type); | |
1735 | break; | |
0ffd9845 | 1736 | |
56622147 ILT |
1737 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
1738 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1739 | Relocate_functions<64, false>::rel32(view, value); | |
1740 | break; | |
2e30d253 | 1741 | } |
2e30d253 ILT |
1742 | } |
1743 | ||
7bf1f802 ILT |
1744 | // Do a relocation in which we convert a TLS General-Dynamic to an |
1745 | // Initial-Exec. | |
1746 | ||
1747 | inline void | |
1748 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
1749 | size_t relnum, | |
1750 | Output_segment* tls_segment, | |
1751 | const elfcpp::Rela<64, false>& rela, | |
1752 | unsigned int, | |
1753 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1754 | unsigned char* view, | |
1755 | off_t view_size) | |
1756 | { | |
1757 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
1758 | // .word 0x6666; rex64; call __tls_get_addr | |
1759 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
1760 | ||
1761 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
1762 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
1763 | ||
1764 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1765 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1766 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1767 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
1768 | ||
1769 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
1770 | ||
1771 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1772 | Relocate_functions<64, false>::rela32(view + 8, value, 0); | |
1773 | ||
1774 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1775 | // We can skip it. | |
1776 | this->skip_call_tls_get_addr_ = true; | |
1777 | } | |
1778 | ||
e041f13d | 1779 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
1780 | // Local-Exec. |
1781 | ||
1782 | inline void | |
d61c17ea ILT |
1783 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
1784 | size_t relnum, | |
1785 | Output_segment* tls_segment, | |
72ec2876 | 1786 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1787 | unsigned int, |
1788 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1789 | unsigned char* view, | |
1790 | off_t view_size) | |
2e30d253 | 1791 | { |
0ffd9845 ILT |
1792 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
1793 | // .word 0x6666; rex64; call __tls_get_addr | |
1794 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 1795 | |
72ec2876 ILT |
1796 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
1797 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 1798 | |
72ec2876 ILT |
1799 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1800 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1801 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1802 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 1803 | |
0ffd9845 | 1804 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 1805 | |
0ffd9845 ILT |
1806 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); |
1807 | Relocate_functions<64, false>::rela32(view + 8, value, 0); | |
2e30d253 ILT |
1808 | |
1809 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1810 | // We can skip it. | |
1811 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1812 | } |
1813 | ||
2e30d253 | 1814 | inline void |
72ec2876 ILT |
1815 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
1816 | size_t relnum, | |
1817 | Output_segment*, | |
1818 | const elfcpp::Rela<64, false>& rela, | |
1819 | unsigned int, | |
1820 | elfcpp::Elf_types<64>::Elf_Addr, | |
1821 | unsigned char* view, | |
1822 | off_t view_size) | |
2e30d253 | 1823 | { |
72ec2876 ILT |
1824 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
1825 | // ... leq foo@dtpoff(%rax),%reg | |
1826 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 1827 | |
72ec2876 ILT |
1828 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
1829 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 1830 | |
72ec2876 ILT |
1831 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1832 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
1833 | ||
1834 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
1835 | ||
1836 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
1837 | ||
1838 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1839 | // We can skip it. | |
1840 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1841 | } |
1842 | ||
56622147 ILT |
1843 | // Do a relocation in which we convert a TLS Initial-Exec to a |
1844 | // Local-Exec. | |
1845 | ||
1846 | inline void | |
1847 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
1848 | size_t relnum, | |
1849 | Output_segment* tls_segment, | |
1850 | const elfcpp::Rela<64, false>& rela, | |
1851 | unsigned int, | |
1852 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1853 | unsigned char* view, | |
1854 | off_t view_size) | |
1855 | { | |
1856 | // We need to examine the opcodes to figure out which instruction we | |
1857 | // are looking at. | |
1858 | ||
1859 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
1860 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
1861 | ||
1862 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
1863 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
1864 | ||
1865 | unsigned char op1 = view[-3]; | |
1866 | unsigned char op2 = view[-2]; | |
1867 | unsigned char op3 = view[-1]; | |
1868 | unsigned char reg = op3 >> 3; | |
1869 | ||
1870 | if (op2 == 0x8b) | |
1871 | { | |
1872 | // movq | |
1873 | if (op1 == 0x4c) | |
1874 | view[-3] = 0x49; | |
1875 | view[-2] = 0xc7; | |
1876 | view[-1] = 0xc0 | reg; | |
1877 | } | |
1878 | else if (reg == 4) | |
1879 | { | |
1880 | // Special handling for %rsp. | |
1881 | if (op1 == 0x4c) | |
1882 | view[-3] = 0x49; | |
1883 | view[-2] = 0x81; | |
1884 | view[-1] = 0xc0 | reg; | |
1885 | } | |
1886 | else | |
1887 | { | |
1888 | // addq | |
1889 | if (op1 == 0x4c) | |
1890 | view[-3] = 0x4d; | |
1891 | view[-2] = 0x8d; | |
1892 | view[-1] = 0x80 | reg | (reg << 3); | |
1893 | } | |
1894 | ||
1895 | value = value - (tls_segment->vaddr() + tls_segment->memsz()); | |
1896 | Relocate_functions<64, false>::rela32(view, value, 0); | |
1897 | } | |
1898 | ||
2e30d253 ILT |
1899 | // Relocate section data. |
1900 | ||
1901 | void | |
1902 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
1903 | unsigned int sh_type, |
1904 | const unsigned char* prelocs, | |
1905 | size_t reloc_count, | |
730cdc88 ILT |
1906 | Output_section* output_section, |
1907 | bool needs_special_offset_handling, | |
d61c17ea ILT |
1908 | unsigned char* view, |
1909 | elfcpp::Elf_types<64>::Elf_Addr address, | |
1910 | off_t view_size) | |
2e30d253 ILT |
1911 | { |
1912 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
1913 | ||
1914 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1915 | Target_x86_64::Relocate>( | |
1916 | relinfo, | |
1917 | this, | |
1918 | prelocs, | |
1919 | reloc_count, | |
730cdc88 ILT |
1920 | output_section, |
1921 | needs_special_offset_handling, | |
2e30d253 ILT |
1922 | view, |
1923 | address, | |
1924 | view_size); | |
1925 | } | |
1926 | ||
4fb6c25d ILT |
1927 | // Return the value to use for a dynamic which requires special |
1928 | // treatment. This is how we support equality comparisons of function | |
1929 | // pointers across shared library boundaries, as described in the | |
1930 | // processor specific ABI supplement. | |
1931 | ||
1932 | uint64_t | |
1933 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
1934 | { | |
1935 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
1936 | return this->plt_section()->address() + gsym->plt_offset(); | |
1937 | } | |
1938 | ||
2e30d253 ILT |
1939 | // Return a string used to fill a code section with nops to take up |
1940 | // the specified length. | |
1941 | ||
1942 | std::string | |
1943 | Target_x86_64::do_code_fill(off_t length) | |
1944 | { | |
1945 | if (length >= 16) | |
1946 | { | |
1947 | // Build a jmpq instruction to skip over the bytes. | |
1948 | unsigned char jmp[5]; | |
1949 | jmp[0] = 0xe9; | |
1950 | elfcpp::Swap_unaligned<64, false>::writeval(jmp + 1, length - 5); | |
1951 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) | |
1952 | + std::string(length - 5, '\0')); | |
1953 | } | |
1954 | ||
1955 | // Nop sequences of various lengths. | |
1956 | const char nop1[1] = { 0x90 }; // nop | |
1957 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1958 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
1959 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
1960 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
1961 | 0x00 }; // leal 0(%esi,1),%esi | |
1962 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1963 | 0x00, 0x00 }; | |
1964 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
1965 | 0x00, 0x00, 0x00 }; | |
1966 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
1967 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
1968 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
1969 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
1970 | 0x00 }; | |
1971 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
1972 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
1973 | 0x00, 0x00 }; | |
1974 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
1975 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
1976 | 0x00, 0x00, 0x00 }; | |
1977 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1978 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
1979 | 0x00, 0x00, 0x00, 0x00 }; | |
1980 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
1981 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
1982 | 0x27, 0x00, 0x00, 0x00, | |
1983 | 0x00 }; | |
1984 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
1985 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
1986 | 0xbc, 0x27, 0x00, 0x00, | |
1987 | 0x00, 0x00 }; | |
1988 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
1989 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
1990 | 0x90, 0x90, 0x90, 0x90, | |
1991 | 0x90, 0x90, 0x90 }; | |
1992 | ||
1993 | const char* nops[16] = { | |
1994 | NULL, | |
1995 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
1996 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
1997 | }; | |
1998 | ||
1999 | return std::string(nops[length], length); | |
2000 | } | |
2001 | ||
2002 | // The selector for x86_64 object files. | |
2003 | ||
2004 | class Target_selector_x86_64 : public Target_selector | |
2005 | { | |
2006 | public: | |
2007 | Target_selector_x86_64() | |
2008 | : Target_selector(elfcpp::EM_X86_64, 64, false) | |
2009 | { } | |
2010 | ||
2011 | Target* | |
2012 | recognize(int machine, int osabi, int abiversion); | |
2013 | ||
2014 | private: | |
2015 | Target_x86_64* target_; | |
2016 | }; | |
2017 | ||
2018 | // Recognize an x86_64 object file when we already know that the machine | |
2019 | // number is EM_X86_64. | |
2020 | ||
2021 | Target* | |
2022 | Target_selector_x86_64::recognize(int, int, int) | |
2023 | { | |
2024 | if (this->target_ == NULL) | |
2025 | this->target_ = new Target_x86_64(); | |
2026 | return this->target_; | |
2027 | } | |
2028 | ||
2029 | Target_selector_x86_64 target_selector_x86_64; | |
2030 | ||
2031 | } // End anonymous namespace. |