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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. | |
a036edd8 | 153 | class Scan |
2e30d253 | 154 | { |
a036edd8 ILT |
155 | public: |
156 | Scan() | |
157 | : issued_non_pic_error_(false) | |
158 | { } | |
159 | ||
2e30d253 ILT |
160 | inline void |
161 | local(const General_options& options, Symbol_table* symtab, | |
162 | Layout* layout, Target_x86_64* target, | |
163 | Sized_relobj<64, false>* object, | |
164 | unsigned int data_shndx, | |
07f397ab | 165 | Output_section* output_section, |
2e30d253 ILT |
166 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
167 | const elfcpp::Sym<64, false>& lsym); | |
168 | ||
169 | inline void | |
170 | global(const General_options& options, Symbol_table* symtab, | |
171 | Layout* layout, Target_x86_64* target, | |
172 | Sized_relobj<64, false>* object, | |
173 | unsigned int data_shndx, | |
07f397ab | 174 | Output_section* output_section, |
2e30d253 ILT |
175 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
176 | Symbol* gsym); | |
e041f13d | 177 | |
a036edd8 | 178 | private: |
e041f13d ILT |
179 | static void |
180 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
181 | ||
182 | static void | |
183 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
184 | Symbol*); | |
a036edd8 ILT |
185 | |
186 | void | |
187 | check_non_pic(Relobj*, unsigned int r_type); | |
188 | ||
189 | // Whether we have issued an error about a non-PIC compilation. | |
190 | bool issued_non_pic_error_; | |
2e30d253 ILT |
191 | }; |
192 | ||
193 | // The class which implements relocation. | |
194 | class Relocate | |
195 | { | |
196 | public: | |
197 | Relocate() | |
198 | : skip_call_tls_get_addr_(false) | |
199 | { } | |
200 | ||
201 | ~Relocate() | |
202 | { | |
203 | if (this->skip_call_tls_get_addr_) | |
204 | { | |
205 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 206 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
207 | } |
208 | } | |
209 | ||
210 | // Do a relocation. Return false if the caller should not issue | |
211 | // any warnings about this relocation. | |
212 | inline bool | |
213 | relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum, | |
214 | const elfcpp::Rela<64, false>&, | |
215 | unsigned int r_type, const Sized_symbol<64>*, | |
216 | const Symbol_value<64>*, | |
217 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 218 | section_size_type); |
2e30d253 ILT |
219 | |
220 | private: | |
221 | // Do a TLS relocation. | |
222 | inline void | |
7bf1f802 ILT |
223 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
224 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
225 | unsigned int r_type, const Sized_symbol<64>*, |
226 | const Symbol_value<64>*, | |
fe8718a4 ILT |
227 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
228 | section_size_type); | |
2e30d253 | 229 | |
7bf1f802 ILT |
230 | // Do a TLS General-Dynamic to Local-Exec transition. |
231 | inline void | |
232 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
233 | Output_segment* tls_segment, | |
234 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
235 | elfcpp::Elf_types<64>::Elf_Addr value, | |
236 | unsigned char* view, | |
fe8718a4 | 237 | section_size_type view_size); |
7bf1f802 | 238 | |
56622147 ILT |
239 | // Do a TLS General-Dynamic to Local-Exec transition. |
240 | inline void | |
241 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
242 | Output_segment* tls_segment, |
243 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
244 | elfcpp::Elf_types<64>::Elf_Addr value, | |
245 | unsigned char* view, | |
fe8718a4 | 246 | section_size_type view_size); |
2e30d253 | 247 | |
56622147 | 248 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 249 | inline void |
56622147 | 250 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
251 | Output_segment* tls_segment, |
252 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
253 | elfcpp::Elf_types<64>::Elf_Addr value, | |
254 | unsigned char* view, | |
fe8718a4 | 255 | section_size_type view_size); |
2e30d253 | 256 | |
56622147 ILT |
257 | // Do a TLS Initial-Exec to Local-Exec transition. |
258 | static inline void | |
259 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
260 | Output_segment* tls_segment, |
261 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
262 | elfcpp::Elf_types<64>::Elf_Addr value, | |
263 | unsigned char* view, | |
fe8718a4 | 264 | section_size_type view_size); |
2e30d253 ILT |
265 | |
266 | // This is set if we should skip the next reloc, which should be a | |
267 | // PLT32 reloc against ___tls_get_addr. | |
268 | bool skip_call_tls_get_addr_; | |
269 | }; | |
270 | ||
6a74a719 ILT |
271 | // A class which returns the size required for a relocation type, |
272 | // used while scanning relocs during a relocatable link. | |
273 | class Relocatable_size_for_reloc | |
274 | { | |
275 | public: | |
276 | unsigned int | |
277 | get_size_for_reloc(unsigned int, Relobj*); | |
278 | }; | |
279 | ||
2e30d253 ILT |
280 | // Adjust TLS relocation type based on the options and whether this |
281 | // is a local symbol. | |
e041f13d | 282 | static tls::Tls_optimization |
2e30d253 ILT |
283 | optimize_tls_reloc(bool is_final, int r_type); |
284 | ||
285 | // Get the GOT section, creating it if necessary. | |
286 | Output_data_got<64, false>* | |
287 | got_section(Symbol_table*, Layout*); | |
288 | ||
96f2030e ILT |
289 | // Get the GOT PLT section. |
290 | Output_data_space* | |
291 | got_plt_section() const | |
292 | { | |
293 | gold_assert(this->got_plt_ != NULL); | |
294 | return this->got_plt_; | |
295 | } | |
296 | ||
2e30d253 ILT |
297 | // Create a PLT entry for a global symbol. |
298 | void | |
299 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
300 | ||
31d60480 ILT |
301 | // Create a GOT entry for the TLS module index. |
302 | unsigned int | |
303 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
304 | Sized_relobj<64, false>* object); | |
305 | ||
2e30d253 ILT |
306 | // Get the PLT section. |
307 | Output_data_plt_x86_64* | |
308 | plt_section() const | |
309 | { | |
310 | gold_assert(this->plt_ != NULL); | |
311 | return this->plt_; | |
312 | } | |
313 | ||
314 | // Get the dynamic reloc section, creating it if necessary. | |
315 | Reloc_section* | |
0ffd9845 | 316 | rela_dyn_section(Layout*); |
2e30d253 | 317 | |
d61c6bd4 ILT |
318 | // Return true if the symbol may need a COPY relocation. |
319 | // References from an executable object to non-function symbols | |
320 | // defined in a dynamic object may need a COPY relocation. | |
321 | bool | |
322 | may_need_copy_reloc(Symbol* gsym) | |
323 | { | |
8851ecca | 324 | return (!parameters->options().shared() |
d61c6bd4 ILT |
325 | && gsym->is_from_dynobj() |
326 | && gsym->type() != elfcpp::STT_FUNC); | |
327 | } | |
328 | ||
2e30d253 ILT |
329 | // Copy a relocation against a global symbol. |
330 | void | |
331 | copy_reloc(const General_options*, Symbol_table*, Layout*, | |
332 | Sized_relobj<64, false>*, unsigned int, | |
4f4c5f80 | 333 | Output_section*, Symbol*, const elfcpp::Rela<64, false>&); |
2e30d253 ILT |
334 | |
335 | // Information about this specific target which we pass to the | |
336 | // general Target structure. | |
337 | static const Target::Target_info x86_64_info; | |
338 | ||
0a65a3a7 CC |
339 | enum Got_type |
340 | { | |
341 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
342 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
343 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
344 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
345 | }; | |
346 | ||
2e30d253 ILT |
347 | // The GOT section. |
348 | Output_data_got<64, false>* got_; | |
349 | // The PLT section. | |
350 | Output_data_plt_x86_64* plt_; | |
351 | // The GOT PLT section. | |
352 | Output_data_space* got_plt_; | |
353 | // The dynamic reloc section. | |
0ffd9845 | 354 | Reloc_section* rela_dyn_; |
2e30d253 ILT |
355 | // Relocs saved to avoid a COPY reloc. |
356 | Copy_relocs<64, false>* copy_relocs_; | |
357 | // Space for variables copied with a COPY reloc. | |
358 | Output_data_space* dynbss_; | |
31d60480 ILT |
359 | // Offset of the GOT entry for the TLS module index; |
360 | unsigned int got_mod_index_offset_; | |
2e30d253 ILT |
361 | }; |
362 | ||
363 | const Target::Target_info Target_x86_64::x86_64_info = | |
364 | { | |
365 | 64, // size | |
366 | false, // is_big_endian | |
367 | elfcpp::EM_X86_64, // machine_code | |
368 | false, // has_make_symbol | |
369 | false, // has_resolve | |
370 | true, // has_code_fill | |
35cdfc9a | 371 | true, // is_default_stack_executable |
2e30d253 | 372 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 373 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
374 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
375 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
376 | }; |
377 | ||
378 | // Get the GOT section, creating it if necessary. | |
379 | ||
380 | Output_data_got<64, false>* | |
381 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
382 | { | |
383 | if (this->got_ == NULL) | |
384 | { | |
385 | gold_assert(symtab != NULL && layout != NULL); | |
386 | ||
387 | this->got_ = new Output_data_got<64, false>(); | |
388 | ||
389 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
390 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
391 | this->got_); | |
392 | ||
393 | // The old GNU linker creates a .got.plt section. We just | |
394 | // create another set of data in the .got section. Note that we | |
395 | // always create a PLT if we create a GOT, although the PLT | |
396 | // might be empty. | |
2e30d253 ILT |
397 | this->got_plt_ = new Output_data_space(8); |
398 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
399 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
400 | this->got_plt_); | |
401 | ||
402 | // The first three entries are reserved. | |
27bc2bce | 403 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
404 | |
405 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 406 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
407 | this->got_plt_, |
408 | 0, 0, elfcpp::STT_OBJECT, | |
409 | elfcpp::STB_LOCAL, | |
410 | elfcpp::STV_HIDDEN, 0, | |
411 | false, false); | |
412 | } | |
413 | ||
414 | return this->got_; | |
415 | } | |
416 | ||
417 | // Get the dynamic reloc section, creating it if necessary. | |
418 | ||
419 | Target_x86_64::Reloc_section* | |
0ffd9845 | 420 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 421 | { |
0ffd9845 | 422 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
423 | { |
424 | gold_assert(layout != NULL); | |
0ffd9845 | 425 | this->rela_dyn_ = new Reloc_section(); |
2e30d253 | 426 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 427 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 428 | } |
0ffd9845 | 429 | return this->rela_dyn_; |
2e30d253 ILT |
430 | } |
431 | ||
432 | // A class to handle the PLT data. | |
433 | ||
434 | class Output_data_plt_x86_64 : public Output_section_data | |
435 | { | |
436 | public: | |
437 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
438 | ||
439 | Output_data_plt_x86_64(Layout*, Output_data_space*); | |
440 | ||
441 | // Add an entry to the PLT. | |
442 | void | |
443 | add_entry(Symbol* gsym); | |
444 | ||
445 | // Return the .rel.plt section data. | |
446 | const Reloc_section* | |
447 | rel_plt() const | |
448 | { return this->rel_; } | |
449 | ||
450 | protected: | |
451 | void | |
452 | do_adjust_output_section(Output_section* os); | |
453 | ||
454 | private: | |
455 | // The size of an entry in the PLT. | |
456 | static const int plt_entry_size = 16; | |
457 | ||
458 | // The first entry in the PLT. | |
459 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
460 | // procedure linkage table for both programs and shared objects." | |
461 | static unsigned char first_plt_entry[plt_entry_size]; | |
462 | ||
463 | // Other entries in the PLT for an executable. | |
464 | static unsigned char plt_entry[plt_entry_size]; | |
465 | ||
466 | // Set the final size. | |
467 | void | |
27bc2bce | 468 | set_final_data_size() |
2e30d253 ILT |
469 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
470 | ||
471 | // Write out the PLT data. | |
472 | void | |
473 | do_write(Output_file*); | |
474 | ||
475 | // The reloc section. | |
476 | Reloc_section* rel_; | |
477 | // The .got.plt section. | |
478 | Output_data_space* got_plt_; | |
479 | // The number of PLT entries. | |
480 | unsigned int count_; | |
481 | }; | |
482 | ||
483 | // Create the PLT section. The ordinary .got section is an argument, | |
484 | // since we need to refer to the start. We also create our own .got | |
485 | // section just for PLT entries. | |
486 | ||
487 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
488 | Output_data_space* got_plt) | |
2e30d253 ILT |
489 | : Output_section_data(8), got_plt_(got_plt), count_(0) |
490 | { | |
491 | this->rel_ = new Reloc_section(); | |
492 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
493 | elfcpp::SHF_ALLOC, this->rel_); | |
494 | } | |
495 | ||
496 | void | |
497 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
498 | { | |
499 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
500 | // linker, and so do we. | |
501 | os->set_entsize(4); | |
502 | } | |
503 | ||
504 | // Add an entry to the PLT. | |
505 | ||
506 | void | |
507 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
508 | { | |
509 | gold_assert(!gsym->has_plt_offset()); | |
510 | ||
511 | // Note that when setting the PLT offset we skip the initial | |
512 | // reserved PLT entry. | |
513 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
514 | ||
515 | ++this->count_; | |
516 | ||
fe8718a4 | 517 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
518 | |
519 | // Every PLT entry needs a GOT entry which points back to the PLT | |
520 | // entry (this will be changed by the dynamic linker, normally | |
521 | // lazily when the function is called). | |
27bc2bce | 522 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
523 | |
524 | // Every PLT entry needs a reloc. | |
525 | gsym->set_needs_dynsym_entry(); | |
526 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
527 | got_offset, 0); | |
528 | ||
529 | // Note that we don't need to save the symbol. The contents of the | |
530 | // PLT are independent of which symbols are used. The symbols only | |
531 | // appear in the relocations. | |
532 | } | |
533 | ||
534 | // The first entry in the PLT for an executable. | |
535 | ||
536 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
537 | { | |
538 | // From AMD64 ABI Draft 0.98, page 76 | |
539 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 540 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
541 | 0xff, 0x25, // jmp indirect |
542 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
543 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
544 | }; | |
545 | ||
546 | // Subsequent entries in the PLT for an executable. | |
547 | ||
548 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
549 | { | |
550 | // From AMD64 ABI Draft 0.98, page 76 | |
551 | 0xff, 0x25, // jmpq indirect | |
552 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
553 | 0x68, // pushq immediate | |
554 | 0, 0, 0, 0, // replaced with offset into relocation table | |
555 | 0xe9, // jmpq relative | |
556 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
557 | }; | |
558 | ||
559 | // Write out the PLT. This uses the hand-coded instructions above, | |
560 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
561 | ||
562 | void | |
563 | Output_data_plt_x86_64::do_write(Output_file* of) | |
564 | { | |
565 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
566 | const section_size_type oview_size = |
567 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
568 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
569 | ||
570 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
571 | const section_size_type got_size = |
572 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
573 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
574 | got_size); | |
575 | ||
576 | unsigned char* pov = oview; | |
577 | ||
578 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
579 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
580 | ||
581 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd ILT |
582 | // We do a jmp relative to the PC at the end of this instruction. |
583 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 8 | |
584 | - (plt_address + 6)); | |
585 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 16 | |
586 | - (plt_address + 12)); | |
2e30d253 ILT |
587 | pov += plt_entry_size; |
588 | ||
589 | unsigned char* got_pov = got_view; | |
590 | ||
591 | memset(got_pov, 0, 24); | |
592 | got_pov += 24; | |
593 | ||
594 | unsigned int plt_offset = plt_entry_size; | |
595 | unsigned int got_offset = 24; | |
596 | const unsigned int count = this->count_; | |
597 | for (unsigned int plt_index = 0; | |
598 | plt_index < count; | |
599 | ++plt_index, | |
600 | pov += plt_entry_size, | |
601 | got_pov += 8, | |
602 | plt_offset += plt_entry_size, | |
603 | got_offset += 8) | |
604 | { | |
605 | // Set and adjust the PLT entry itself. | |
606 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
607 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
608 | (got_address + got_offset | |
609 | - (plt_address + plt_offset | |
610 | + 6))); | |
2e30d253 ILT |
611 | |
612 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
613 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
614 | - (plt_offset + plt_entry_size)); | |
615 | ||
616 | // Set the entry in the GOT. | |
617 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
618 | } | |
619 | ||
fe8718a4 ILT |
620 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
621 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
622 | |
623 | of->write_output_view(offset, oview_size, oview); | |
624 | of->write_output_view(got_file_offset, got_size, got_view); | |
625 | } | |
626 | ||
627 | // Create a PLT entry for a global symbol. | |
628 | ||
629 | void | |
630 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
631 | Symbol* gsym) | |
632 | { | |
633 | if (gsym->has_plt_offset()) | |
634 | return; | |
635 | ||
636 | if (this->plt_ == NULL) | |
637 | { | |
638 | // Create the GOT sections first. | |
639 | this->got_section(symtab, layout); | |
640 | ||
641 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_plt_); | |
642 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
643 | (elfcpp::SHF_ALLOC | |
644 | | elfcpp::SHF_EXECINSTR), | |
645 | this->plt_); | |
646 | } | |
647 | ||
648 | this->plt_->add_entry(gsym); | |
649 | } | |
650 | ||
31d60480 ILT |
651 | // Create a GOT entry for the TLS module index. |
652 | ||
653 | unsigned int | |
654 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
655 | Sized_relobj<64, false>* object) | |
656 | { | |
657 | if (this->got_mod_index_offset_ == -1U) | |
658 | { | |
659 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
660 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
661 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
662 | unsigned int got_offset = got->add_constant(0); | |
663 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
664 | got_offset, 0); | |
665 | got->add_constant(0); | |
666 | this->got_mod_index_offset_ = got_offset; | |
667 | } | |
668 | return this->got_mod_index_offset_; | |
669 | } | |
670 | ||
2e30d253 ILT |
671 | // Handle a relocation against a non-function symbol defined in a |
672 | // dynamic object. The traditional way to handle this is to generate | |
673 | // a COPY relocation to copy the variable at runtime from the shared | |
674 | // object into the executable's data segment. However, this is | |
675 | // undesirable in general, as if the size of the object changes in the | |
676 | // dynamic object, the executable will no longer work correctly. If | |
677 | // this relocation is in a writable section, then we can create a | |
678 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
679 | // address at runtime. However, we do not want do that if the | |
680 | // relocation is in a read-only section, as it would prevent the | |
681 | // readonly segment from being shared. And if we have to eventually | |
682 | // generate a COPY reloc, then any dynamic relocations will be | |
683 | // useless. So this means that if this is a writable section, we need | |
684 | // to save the relocation until we see whether we have to create a | |
685 | // COPY relocation for this symbol for any other relocation. | |
686 | ||
687 | void | |
688 | Target_x86_64::copy_reloc(const General_options* options, | |
d61c17ea ILT |
689 | Symbol_table* symtab, |
690 | Layout* layout, | |
691 | Sized_relobj<64, false>* object, | |
4f4c5f80 ILT |
692 | unsigned int data_shndx, |
693 | Output_section* output_section, | |
694 | Symbol* gsym, | |
72ec2876 | 695 | const elfcpp::Rela<64, false>& rela) |
2e30d253 | 696 | { |
7d1a9ebb | 697 | Sized_symbol<64>* ssym = symtab->get_sized_symbol<64>(gsym); |
2e30d253 ILT |
698 | |
699 | if (!Copy_relocs<64, false>::need_copy_reloc(options, object, | |
700 | data_shndx, ssym)) | |
701 | { | |
702 | // So far we do not need a COPY reloc. Save this relocation. | |
703 | // If it turns out that we never need a COPY reloc for this | |
704 | // symbol, then we will emit the relocation. | |
705 | if (this->copy_relocs_ == NULL) | |
706 | this->copy_relocs_ = new Copy_relocs<64, false>(); | |
4f4c5f80 | 707 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rela); |
2e30d253 ILT |
708 | } |
709 | else | |
710 | { | |
711 | // Allocate space for this symbol in the .bss section. | |
712 | ||
713 | elfcpp::Elf_types<64>::Elf_WXword symsize = ssym->symsize(); | |
714 | ||
715 | // There is no defined way to determine the required alignment | |
716 | // of the symbol. We pick the alignment based on the size. We | |
717 | // set an arbitrary maximum of 256. | |
718 | unsigned int align; | |
719 | for (align = 1; align < 512; align <<= 1) | |
720 | if ((symsize & align) != 0) | |
721 | break; | |
722 | ||
723 | if (this->dynbss_ == NULL) | |
724 | { | |
725 | this->dynbss_ = new Output_data_space(align); | |
726 | layout->add_output_section_data(".bss", | |
727 | elfcpp::SHT_NOBITS, | |
728 | (elfcpp::SHF_ALLOC | |
729 | | elfcpp::SHF_WRITE), | |
730 | this->dynbss_); | |
731 | } | |
732 | ||
733 | Output_data_space* dynbss = this->dynbss_; | |
734 | ||
735 | if (align > dynbss->addralign()) | |
736 | dynbss->set_space_alignment(align); | |
737 | ||
fe8718a4 | 738 | section_size_type dynbss_size = dynbss->current_data_size(); |
2e30d253 | 739 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 740 | section_size_type offset = dynbss_size; |
27bc2bce | 741 | dynbss->set_current_data_size(dynbss_size + symsize); |
2e30d253 | 742 | |
9b07f471 | 743 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
2e30d253 ILT |
744 | |
745 | // Add the COPY reloc. | |
0ffd9845 ILT |
746 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
747 | rela_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0); | |
2e30d253 ILT |
748 | } |
749 | } | |
750 | ||
751 | ||
752 | // Optimize the TLS relocation type based on what we know about the | |
753 | // symbol. IS_FINAL is true if the final address of this symbol is | |
754 | // known at link time. | |
755 | ||
e041f13d | 756 | tls::Tls_optimization |
2e30d253 ILT |
757 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
758 | { | |
2e30d253 ILT |
759 | // If we are generating a shared library, then we can't do anything |
760 | // in the linker. | |
8851ecca | 761 | if (parameters->options().shared()) |
e041f13d | 762 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
763 | |
764 | switch (r_type) | |
765 | { | |
766 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
767 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
768 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
769 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
770 | // access. Since we know that we are generating an executable, |
771 | // we can convert this to Initial-Exec. If we also know that | |
772 | // this is a local symbol, we can further switch to Local-Exec. | |
773 | if (is_final) | |
e041f13d ILT |
774 | return tls::TLSOPT_TO_LE; |
775 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 776 | |
d61c17ea | 777 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
778 | // This is Local-Dynamic, which refers to a local symbol in the |
779 | // dynamic TLS block. Since we know that we generating an | |
780 | // executable, we can switch to Local-Exec. | |
e041f13d | 781 | return tls::TLSOPT_TO_LE; |
2e30d253 | 782 | |
0ffd9845 | 783 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
784 | case elfcpp::R_X86_64_DTPOFF64: |
785 | // Another Local-Dynamic reloc. | |
e041f13d | 786 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 787 | |
d61c17ea | 788 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
789 | // These are Initial-Exec relocs which get the thread offset |
790 | // from the GOT. If we know that we are linking against the | |
791 | // local symbol, we can switch to Local-Exec, which links the | |
792 | // thread offset into the instruction. | |
793 | if (is_final) | |
e041f13d ILT |
794 | return tls::TLSOPT_TO_LE; |
795 | return tls::TLSOPT_NONE; | |
2e30d253 | 796 | |
d61c17ea | 797 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
798 | // When we already have Local-Exec, there is nothing further we |
799 | // can do. | |
e041f13d | 800 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
801 | |
802 | default: | |
803 | gold_unreachable(); | |
804 | } | |
2e30d253 ILT |
805 | } |
806 | ||
e041f13d ILT |
807 | // Report an unsupported relocation against a local symbol. |
808 | ||
809 | void | |
810 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
811 | unsigned int r_type) | |
812 | { | |
75f2446e ILT |
813 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
814 | object->name().c_str(), r_type); | |
e041f13d ILT |
815 | } |
816 | ||
a036edd8 ILT |
817 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
818 | // dynamic linker does not support it, issue an error. The GNU linker | |
819 | // only issues a non-PIC error for an allocated read-only section. | |
820 | // Here we know the section is allocated, but we don't know that it is | |
821 | // read-only. But we check for all the relocation types which the | |
822 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
823 | // error even if the section is not read-only. | |
824 | ||
825 | void | |
826 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
827 | { | |
828 | switch (r_type) | |
829 | { | |
830 | // These are the relocation types supported by glibc for x86_64. | |
831 | case elfcpp::R_X86_64_RELATIVE: | |
832 | case elfcpp::R_X86_64_GLOB_DAT: | |
833 | case elfcpp::R_X86_64_JUMP_SLOT: | |
834 | case elfcpp::R_X86_64_DTPMOD64: | |
835 | case elfcpp::R_X86_64_DTPOFF64: | |
836 | case elfcpp::R_X86_64_TPOFF64: | |
837 | case elfcpp::R_X86_64_64: | |
838 | case elfcpp::R_X86_64_32: | |
839 | case elfcpp::R_X86_64_PC32: | |
840 | case elfcpp::R_X86_64_COPY: | |
841 | return; | |
842 | ||
843 | default: | |
844 | // This prevents us from issuing more than one error per reloc | |
845 | // section. But we can still wind up issuing more than one | |
846 | // error per object file. | |
847 | if (this->issued_non_pic_error_) | |
848 | return; | |
849 | object->error(_("requires unsupported dynamic reloc; " | |
850 | "recompile with -fPIC")); | |
851 | this->issued_non_pic_error_ = true; | |
852 | return; | |
853 | ||
854 | case elfcpp::R_X86_64_NONE: | |
855 | gold_unreachable(); | |
856 | } | |
857 | } | |
858 | ||
2e30d253 ILT |
859 | // Scan a relocation for a local symbol. |
860 | ||
861 | inline void | |
862 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
863 | Symbol_table* symtab, |
864 | Layout* layout, | |
865 | Target_x86_64* target, | |
866 | Sized_relobj<64, false>* object, | |
0ffd9845 | 867 | unsigned int data_shndx, |
4f4c5f80 | 868 | Output_section* output_section, |
0ffd9845 | 869 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 870 | unsigned int r_type, |
7bf1f802 | 871 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
872 | { |
873 | switch (r_type) | |
874 | { | |
875 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
876 | case elfcpp::R_386_GNU_VTINHERIT: |
877 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
878 | break; |
879 | ||
880 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 881 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
882 | // executable), we need to create a dynamic relocation for this |
883 | // location. The relocation applied at link time will apply the | |
884 | // link-time value, so we flag the location with an | |
885 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 886 | // relocate it easily. |
8851ecca | 887 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 888 | { |
e8c846c3 | 889 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 890 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
891 | rela_dyn->add_local_relative(object, r_sym, |
892 | elfcpp::R_X86_64_RELATIVE, | |
893 | output_section, data_shndx, | |
894 | reloc.get_r_offset(), | |
895 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
896 | } |
897 | break; | |
898 | ||
2e30d253 ILT |
899 | case elfcpp::R_X86_64_32: |
900 | case elfcpp::R_X86_64_32S: | |
901 | case elfcpp::R_X86_64_16: | |
902 | case elfcpp::R_X86_64_8: | |
96f2030e | 903 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
904 | // executable), we need to create a dynamic relocation for this |
905 | // location. We can't use an R_X86_64_RELATIVE relocation | |
906 | // because that is always a 64-bit relocation. | |
8851ecca | 907 | if (parameters->options().output_is_position_independent()) |
96f2030e | 908 | { |
a036edd8 ILT |
909 | this->check_non_pic(object, r_type); |
910 | ||
96f2030e | 911 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
dceae3c1 ILT |
912 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
913 | { | |
914 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
915 | rela_dyn->add_local(object, r_sym, r_type, output_section, | |
916 | data_shndx, reloc.get_r_offset(), | |
917 | reloc.get_r_addend()); | |
918 | } | |
919 | else | |
920 | { | |
921 | gold_assert(lsym.get_st_value() == 0); | |
922 | rela_dyn->add_local_section(object, lsym.get_st_shndx(), | |
923 | r_type, output_section, | |
924 | data_shndx, reloc.get_r_offset(), | |
925 | reloc.get_r_addend()); | |
926 | } | |
96f2030e | 927 | } |
2e30d253 ILT |
928 | break; |
929 | ||
930 | case elfcpp::R_X86_64_PC64: | |
931 | case elfcpp::R_X86_64_PC32: | |
932 | case elfcpp::R_X86_64_PC16: | |
933 | case elfcpp::R_X86_64_PC8: | |
934 | break; | |
935 | ||
f389a824 ILT |
936 | case elfcpp::R_X86_64_PLT32: |
937 | // Since we know this is a local symbol, we can handle this as a | |
938 | // PC32 reloc. | |
939 | break; | |
940 | ||
fdc2f80f | 941 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 942 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
943 | case elfcpp::R_X86_64_GOTPC64: |
944 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
945 | // We need a GOT section. |
946 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
947 | // For PLTOFF64, we'd normally want a PLT section, but since we |
948 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
949 | break; |
950 | ||
0ffd9845 ILT |
951 | case elfcpp::R_X86_64_GOT64: |
952 | case elfcpp::R_X86_64_GOT32: | |
953 | case elfcpp::R_X86_64_GOTPCREL64: | |
954 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 955 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
956 | { |
957 | // The symbol requires a GOT entry. | |
958 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
959 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 960 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
961 | { |
962 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 963 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 964 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
965 | { |
966 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
967 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
968 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
969 | rela_dyn->add_local_relative( |
970 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
971 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 972 | else |
dceae3c1 | 973 | { |
a036edd8 ILT |
974 | this->check_non_pic(object, r_type); |
975 | ||
dceae3c1 | 976 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
977 | rela_dyn->add_local( |
978 | object, r_sym, r_type, got, | |
979 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 980 | } |
0ffd9845 ILT |
981 | } |
982 | } | |
ee9e9e86 ILT |
983 | // For GOTPLT64, we'd normally want a PLT section, but since |
984 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
985 | } |
986 | break; | |
987 | ||
2e30d253 ILT |
988 | case elfcpp::R_X86_64_COPY: |
989 | case elfcpp::R_X86_64_GLOB_DAT: | |
990 | case elfcpp::R_X86_64_JUMP_SLOT: | |
991 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 992 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 993 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 994 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 995 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
996 | gold_error(_("%s: unexpected reloc %u in object file"), |
997 | object->name().c_str(), r_type); | |
2e30d253 ILT |
998 | break; |
999 | ||
d61c17ea | 1000 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1001 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1002 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1003 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1004 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1005 | case elfcpp::R_X86_64_DTPOFF32: |
1006 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1007 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1008 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1009 | { |
8851ecca | 1010 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1011 | const tls::Tls_optimization optimized_type |
1012 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1013 | switch (r_type) |
1014 | { | |
56622147 | 1015 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1016 | if (optimized_type == tls::TLSOPT_NONE) |
1017 | { | |
1018 | // Create a pair of GOT entries for the module index and | |
1019 | // dtv-relative offset. | |
1020 | Output_data_got<64, false>* got | |
1021 | = target->got_section(symtab, layout); | |
1022 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 CC |
1023 | got->add_local_pair_with_rela(object, r_sym, |
1024 | lsym.get_st_shndx(), | |
1025 | GOT_TYPE_TLS_PAIR, | |
1026 | target->rela_dyn_section(layout), | |
1027 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1028 | } |
1029 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1030 | unsupported_reloc_local(object, r_type); | |
1031 | break; | |
1032 | ||
56622147 ILT |
1033 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1034 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1035 | // FIXME: If not relaxing to LE, we need to generate | |
7bf1f802 | 1036 | // a GOT entry with a R_x86_64_TLSDESC reloc. |
56622147 ILT |
1037 | if (optimized_type != tls::TLSOPT_TO_LE) |
1038 | unsupported_reloc_local(object, r_type); | |
2e30d253 ILT |
1039 | break; |
1040 | ||
e041f13d | 1041 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1042 | if (optimized_type == tls::TLSOPT_NONE) |
1043 | { | |
1044 | // Create a GOT entry for the module index. | |
31d60480 | 1045 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1046 | } |
1047 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1048 | unsupported_reloc_local(object, r_type); | |
1049 | break; | |
1050 | ||
0ffd9845 ILT |
1051 | case elfcpp::R_X86_64_DTPOFF32: |
1052 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1053 | break; |
1054 | ||
56622147 | 1055 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1056 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1057 | if (optimized_type == tls::TLSOPT_NONE) |
1058 | { | |
1059 | // Create a GOT entry for the tp-relative offset. | |
1060 | Output_data_got<64, false>* got | |
1061 | = target->got_section(symtab, layout); | |
1062 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1063 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1064 | target->rela_dyn_section(layout), |
1065 | elfcpp::R_X86_64_TPOFF64); | |
1066 | } | |
1067 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1068 | unsupported_reloc_local(object, r_type); |
1069 | break; | |
0ffd9845 | 1070 | |
56622147 | 1071 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1072 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1073 | if (output_is_shared) |
1074 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1075 | break; |
e041f13d ILT |
1076 | |
1077 | default: | |
1078 | gold_unreachable(); | |
2e30d253 ILT |
1079 | } |
1080 | } | |
1081 | break; | |
2e30d253 | 1082 | |
fdc2f80f ILT |
1083 | case elfcpp::R_X86_64_SIZE32: |
1084 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1085 | default: |
75f2446e ILT |
1086 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1087 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1088 | break; |
1089 | } | |
1090 | } | |
1091 | ||
1092 | ||
e041f13d ILT |
1093 | // Report an unsupported relocation against a global symbol. |
1094 | ||
1095 | void | |
1096 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1097 | unsigned int r_type, | |
1098 | Symbol* gsym) | |
1099 | { | |
75f2446e | 1100 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1101 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1102 | } |
1103 | ||
2e30d253 ILT |
1104 | // Scan a relocation for a global symbol. |
1105 | ||
1106 | inline void | |
1107 | Target_x86_64::Scan::global(const General_options& options, | |
d61c17ea ILT |
1108 | Symbol_table* symtab, |
1109 | Layout* layout, | |
1110 | Target_x86_64* target, | |
1111 | Sized_relobj<64, false>* object, | |
1112 | unsigned int data_shndx, | |
4f4c5f80 | 1113 | Output_section* output_section, |
d61c17ea ILT |
1114 | const elfcpp::Rela<64, false>& reloc, |
1115 | unsigned int r_type, | |
1116 | Symbol* gsym) | |
2e30d253 ILT |
1117 | { |
1118 | switch (r_type) | |
1119 | { | |
1120 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1121 | case elfcpp::R_386_GNU_VTINHERIT: |
1122 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1123 | break; |
1124 | ||
1125 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1126 | case elfcpp::R_X86_64_32: |
1127 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1128 | case elfcpp::R_X86_64_16: |
2e30d253 | 1129 | case elfcpp::R_X86_64_8: |
96f2030e | 1130 | { |
d61c6bd4 ILT |
1131 | // Make a PLT entry if necessary. |
1132 | if (gsym->needs_plt_entry()) | |
1133 | { | |
1134 | target->make_plt_entry(symtab, layout, gsym); | |
1135 | // Since this is not a PC-relative relocation, we may be | |
1136 | // taking the address of a function. In that case we need to | |
1137 | // set the entry in the dynamic symbol table to the address of | |
1138 | // the PLT entry. | |
8851ecca | 1139 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1140 | gsym->set_needs_dynsym_value(); |
1141 | } | |
1142 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1143 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1144 | { |
1145 | if (target->may_need_copy_reloc(gsym)) | |
1146 | { | |
7bf1f802 ILT |
1147 | target->copy_reloc(&options, symtab, layout, object, |
1148 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 ILT |
1149 | } |
1150 | else if (r_type == elfcpp::R_X86_64_64 | |
1151 | && gsym->can_use_relative_reloc(false)) | |
1152 | { | |
1153 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1154 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1155 | output_section, object, | |
1156 | data_shndx, reloc.get_r_offset(), | |
1157 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1158 | } |
1159 | else | |
1160 | { | |
a036edd8 | 1161 | this->check_non_pic(object, r_type); |
96f2030e | 1162 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1163 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1164 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1165 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1166 | } |
1167 | } | |
1168 | } | |
1169 | break; | |
1170 | ||
1171 | case elfcpp::R_X86_64_PC64: | |
1172 | case elfcpp::R_X86_64_PC32: | |
1173 | case elfcpp::R_X86_64_PC16: | |
1174 | case elfcpp::R_X86_64_PC8: | |
1175 | { | |
1176 | // Make a PLT entry if necessary. | |
1177 | if (gsym->needs_plt_entry()) | |
1178 | target->make_plt_entry(symtab, layout, gsym); | |
1179 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1180 | int flags = Symbol::NON_PIC_REF; |
1181 | if (gsym->type() == elfcpp::STT_FUNC) | |
1182 | flags |= Symbol::FUNCTION_CALL; | |
1183 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1184 | { |
d61c6bd4 ILT |
1185 | if (target->may_need_copy_reloc(gsym)) |
1186 | { | |
7bf1f802 ILT |
1187 | target->copy_reloc(&options, symtab, layout, object, |
1188 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 | 1189 | } |
86849f1f | 1190 | else |
d61c6bd4 | 1191 | { |
a036edd8 | 1192 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1193 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1194 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1195 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1196 | reloc.get_r_addend()); |
1197 | } | |
86849f1f | 1198 | } |
d61c6bd4 | 1199 | } |
2e30d253 ILT |
1200 | break; |
1201 | ||
ff006520 | 1202 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1203 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1204 | case elfcpp::R_X86_64_GOTPCREL64: |
1205 | case elfcpp::R_X86_64_GOTPCREL: | |
1206 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1207 | { |
1208 | // The symbol requires a GOT entry. | |
1209 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1210 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1211 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1212 | else |
1213 | { | |
2e30d253 ILT |
1214 | // If this symbol is not fully resolved, we need to add a |
1215 | // dynamic relocation for it. | |
7bf1f802 | 1216 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1217 | if (gsym->is_from_dynobj() |
1218 | || gsym->is_undefined() | |
1219 | || gsym->is_preemptible()) | |
0a65a3a7 | 1220 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1221 | elfcpp::R_X86_64_GLOB_DAT); |
1222 | else | |
2e30d253 | 1223 | { |
0a65a3a7 CC |
1224 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1225 | rela_dyn->add_global_relative( | |
1226 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1227 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1228 | } |
1229 | } | |
ee9e9e86 ILT |
1230 | // For GOTPLT64, we also need a PLT entry (but only if the |
1231 | // symbol is not fully resolved). | |
1232 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1233 | && !gsym->final_value_is_known()) | |
1234 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1235 | } |
1236 | break; | |
1237 | ||
1238 | case elfcpp::R_X86_64_PLT32: | |
1239 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1240 | // Otherwise we need a PLT entry. | |
1241 | if (gsym->final_value_is_known()) | |
1242 | break; | |
96f2030e ILT |
1243 | // If building a shared library, we can also skip the PLT entry |
1244 | // if the symbol is defined in the output file and is protected | |
1245 | // or hidden. | |
1246 | if (gsym->is_defined() | |
1247 | && !gsym->is_from_dynobj() | |
1248 | && !gsym->is_preemptible()) | |
1249 | break; | |
2e30d253 ILT |
1250 | target->make_plt_entry(symtab, layout, gsym); |
1251 | break; | |
1252 | ||
fdc2f80f | 1253 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1254 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1255 | case elfcpp::R_X86_64_GOTPC64: |
1256 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1257 | // We need a GOT section. |
1258 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1259 | // For PLTOFF64, we also need a PLT entry (but only if the |
1260 | // symbol is not fully resolved). | |
1261 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1262 | && !gsym->final_value_is_known()) | |
1263 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1264 | break; |
1265 | ||
2e30d253 ILT |
1266 | case elfcpp::R_X86_64_COPY: |
1267 | case elfcpp::R_X86_64_GLOB_DAT: | |
1268 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1269 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1270 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1271 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1272 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1273 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1274 | gold_error(_("%s: unexpected reloc %u in object file"), |
1275 | object->name().c_str(), r_type); | |
2e30d253 | 1276 | break; |
2e30d253 | 1277 | |
d61c17ea | 1278 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1279 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1280 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1281 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1282 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1283 | case elfcpp::R_X86_64_DTPOFF32: |
1284 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1285 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1286 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1287 | { |
1288 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1289 | const tls::Tls_optimization optimized_type |
1290 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1291 | switch (r_type) |
1292 | { | |
56622147 | 1293 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1294 | if (optimized_type == tls::TLSOPT_NONE) |
1295 | { | |
1296 | // Create a pair of GOT entries for the module index and | |
1297 | // dtv-relative offset. | |
1298 | Output_data_got<64, false>* got | |
1299 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1300 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1301 | target->rela_dyn_section(layout), | |
1302 | elfcpp::R_X86_64_DTPMOD64, | |
1303 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1304 | } |
1305 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1306 | { | |
1307 | // Create a GOT entry for the tp-relative offset. | |
1308 | Output_data_got<64, false>* got | |
1309 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1310 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1311 | target->rela_dyn_section(layout), |
1312 | elfcpp::R_X86_64_TPOFF64); | |
1313 | } | |
1314 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1315 | unsupported_reloc_global(object, r_type, gsym); | |
1316 | break; | |
1317 | ||
56622147 ILT |
1318 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1319 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1320 | // FIXME: If not relaxing to LE, we need to generate | |
1321 | // DTPMOD64 and DTPOFF64, or TLSDESC, relocs. | |
1322 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1323 | unsupported_reloc_global(object, r_type, gsym); | |
2e30d253 ILT |
1324 | break; |
1325 | ||
e041f13d | 1326 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1327 | if (optimized_type == tls::TLSOPT_NONE) |
1328 | { | |
1329 | // Create a GOT entry for the module index. | |
31d60480 | 1330 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1331 | } |
1332 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1333 | unsupported_reloc_global(object, r_type, gsym); | |
1334 | break; | |
1335 | ||
0ffd9845 ILT |
1336 | case elfcpp::R_X86_64_DTPOFF32: |
1337 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1338 | break; |
1339 | ||
56622147 | 1340 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1341 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1342 | if (optimized_type == tls::TLSOPT_NONE) |
1343 | { | |
1344 | // Create a GOT entry for the tp-relative offset. | |
1345 | Output_data_got<64, false>* got | |
1346 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1347 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1348 | target->rela_dyn_section(layout), |
1349 | elfcpp::R_X86_64_TPOFF64); | |
1350 | } | |
1351 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1352 | unsupported_reloc_global(object, r_type, gsym); |
1353 | break; | |
0ffd9845 | 1354 | |
56622147 | 1355 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1356 | layout->set_has_static_tls(); |
8851ecca | 1357 | if (parameters->options().shared()) |
7bf1f802 | 1358 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1359 | break; |
e041f13d ILT |
1360 | |
1361 | default: | |
1362 | gold_unreachable(); | |
2e30d253 ILT |
1363 | } |
1364 | } | |
1365 | break; | |
fdc2f80f ILT |
1366 | |
1367 | case elfcpp::R_X86_64_SIZE32: | |
1368 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1369 | default: |
75f2446e | 1370 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1371 | object->name().c_str(), r_type, |
1372 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1373 | break; |
1374 | } | |
1375 | } | |
1376 | ||
1377 | // Scan relocations for a section. | |
1378 | ||
1379 | void | |
1380 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1381 | Symbol_table* symtab, |
1382 | Layout* layout, | |
1383 | Sized_relobj<64, false>* object, | |
1384 | unsigned int data_shndx, | |
1385 | unsigned int sh_type, | |
1386 | const unsigned char* prelocs, | |
1387 | size_t reloc_count, | |
730cdc88 ILT |
1388 | Output_section* output_section, |
1389 | bool needs_special_offset_handling, | |
d61c17ea | 1390 | size_t local_symbol_count, |
730cdc88 | 1391 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1392 | { |
1393 | if (sh_type == elfcpp::SHT_REL) | |
1394 | { | |
75f2446e ILT |
1395 | gold_error(_("%s: unsupported REL reloc section"), |
1396 | object->name().c_str()); | |
1397 | return; | |
2e30d253 ILT |
1398 | } |
1399 | ||
1400 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1401 | Target_x86_64::Scan>( | |
1402 | options, | |
1403 | symtab, | |
1404 | layout, | |
1405 | this, | |
1406 | object, | |
1407 | data_shndx, | |
1408 | prelocs, | |
1409 | reloc_count, | |
730cdc88 ILT |
1410 | output_section, |
1411 | needs_special_offset_handling, | |
2e30d253 | 1412 | local_symbol_count, |
730cdc88 | 1413 | plocal_symbols); |
2e30d253 ILT |
1414 | } |
1415 | ||
1416 | // Finalize the sections. | |
1417 | ||
1418 | void | |
1419 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1420 | { | |
1421 | // Fill in some more dynamic tags. | |
1422 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1423 | if (odyn != NULL) | |
1424 | { | |
1425 | if (this->got_plt_ != NULL) | |
1426 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1427 | ||
1428 | if (this->plt_ != NULL) | |
1429 | { | |
1430 | const Output_data* od = this->plt_->rel_plt(); | |
1431 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1432 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1433 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
1434 | } | |
1435 | ||
0ffd9845 | 1436 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1437 | { |
0ffd9845 | 1438 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1439 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1440 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1441 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1442 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1443 | } |
1444 | ||
8851ecca | 1445 | if (!parameters->options().shared()) |
2e30d253 ILT |
1446 | { |
1447 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1448 | // linker at run time, and used by the debugger. | |
1449 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1454 | // relocs. | |
1455 | if (this->copy_relocs_ == NULL) | |
1456 | return; | |
1457 | if (this->copy_relocs_->any_to_emit()) | |
1458 | { | |
0ffd9845 ILT |
1459 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
1460 | this->copy_relocs_->emit(rela_dyn); | |
2e30d253 ILT |
1461 | } |
1462 | delete this->copy_relocs_; | |
1463 | this->copy_relocs_ = NULL; | |
1464 | } | |
1465 | ||
1466 | // Perform a relocation. | |
1467 | ||
1468 | inline bool | |
1469 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1470 | Target_x86_64* target, | |
1471 | size_t relnum, | |
0ffd9845 | 1472 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1473 | unsigned int r_type, |
1474 | const Sized_symbol<64>* gsym, | |
1475 | const Symbol_value<64>* psymval, | |
1476 | unsigned char* view, | |
1477 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1478 | section_size_type view_size) |
2e30d253 ILT |
1479 | { |
1480 | if (this->skip_call_tls_get_addr_) | |
1481 | { | |
1482 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1483 | || gsym == NULL | |
0ffd9845 | 1484 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1485 | { |
75f2446e ILT |
1486 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1487 | _("missing expected TLS relocation")); | |
1488 | } | |
1489 | else | |
1490 | { | |
1491 | this->skip_call_tls_get_addr_ = false; | |
1492 | return false; | |
2e30d253 | 1493 | } |
2e30d253 ILT |
1494 | } |
1495 | ||
1496 | // Pick the value to use for symbols defined in shared objects. | |
1497 | Symbol_value<64> symval; | |
96f2030e ILT |
1498 | if (gsym != NULL |
1499 | && (gsym->is_from_dynobj() | |
8851ecca | 1500 | || (parameters->options().shared() |
8fc19601 | 1501 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
96f2030e | 1502 | && gsym->has_plt_offset()) |
2e30d253 ILT |
1503 | { |
1504 | symval.set_output_value(target->plt_section()->address() | |
1505 | + gsym->plt_offset()); | |
1506 | psymval = &symval; | |
1507 | } | |
1508 | ||
1509 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1510 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1511 | ||
1512 | // Get the GOT offset if needed. | |
96f2030e ILT |
1513 | // The GOT pointer points to the end of the GOT section. |
1514 | // We need to subtract the size of the GOT section to get | |
1515 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1516 | bool have_got_offset = false; |
1517 | unsigned int got_offset = 0; | |
1518 | switch (r_type) | |
1519 | { | |
1520 | case elfcpp::R_X86_64_GOT32: | |
1521 | case elfcpp::R_X86_64_GOT64: | |
1522 | case elfcpp::R_X86_64_GOTPLT64: | |
1523 | case elfcpp::R_X86_64_GOTPCREL: | |
1524 | case elfcpp::R_X86_64_GOTPCREL64: | |
1525 | if (gsym != NULL) | |
1526 | { | |
0a65a3a7 CC |
1527 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1528 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1529 | } |
1530 | else | |
1531 | { | |
1532 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1533 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1534 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1535 | - target->got_size()); | |
0ffd9845 ILT |
1536 | } |
1537 | have_got_offset = true; | |
1538 | break; | |
1539 | ||
1540 | default: | |
1541 | break; | |
1542 | } | |
2e30d253 ILT |
1543 | |
1544 | switch (r_type) | |
1545 | { | |
1546 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1547 | case elfcpp::R_386_GNU_VTINHERIT: |
1548 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1549 | break; |
1550 | ||
1551 | case elfcpp::R_X86_64_64: | |
1552 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1553 | break; | |
1554 | ||
1555 | case elfcpp::R_X86_64_PC64: | |
1556 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1557 | address); | |
1558 | break; | |
1559 | ||
1560 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1561 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1562 | // uint64_t x = value + addend; | |
1563 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1564 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1565 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1566 | break; | |
1567 | ||
1568 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1569 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1570 | // int64_t x = value + addend; // note this quantity is signed! | |
1571 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1572 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1573 | break; | |
1574 | ||
1575 | case elfcpp::R_X86_64_PC32: | |
1576 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1577 | address); | |
1578 | break; | |
1579 | ||
1580 | case elfcpp::R_X86_64_16: | |
1581 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1582 | break; | |
1583 | ||
1584 | case elfcpp::R_X86_64_PC16: | |
1585 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1586 | address); | |
1587 | break; | |
1588 | ||
1589 | case elfcpp::R_X86_64_8: | |
1590 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1591 | break; | |
1592 | ||
1593 | case elfcpp::R_X86_64_PC8: | |
1594 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1595 | address); | |
1596 | break; | |
1597 | ||
1598 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1599 | gold_assert(gsym == NULL |
1600 | || gsym->has_plt_offset() | |
99f8faca ILT |
1601 | || gsym->final_value_is_known() |
1602 | || (gsym->is_defined() | |
1603 | && !gsym->is_from_dynobj() | |
1604 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1605 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1606 | // behaves differently because psymval was set to point to | |
1607 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1608 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1609 | address); | |
1610 | break; | |
1611 | ||
ee9e9e86 ILT |
1612 | case elfcpp::R_X86_64_PLTOFF64: |
1613 | { | |
1614 | gold_assert(gsym); | |
1615 | gold_assert(gsym->has_plt_offset() | |
1616 | || gsym->final_value_is_known()); | |
1617 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1618 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1619 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1620 | addend - got_address); | |
ee9e9e86 ILT |
1621 | } |
1622 | ||
2e30d253 | 1623 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1624 | gold_assert(have_got_offset); |
1625 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1626 | break; |
1627 | ||
e822f2b1 ILT |
1628 | case elfcpp::R_X86_64_GOTPC32: |
1629 | { | |
1630 | gold_assert(gsym); | |
1631 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1632 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1633 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1634 | } | |
1635 | break; | |
1636 | ||
1637 | case elfcpp::R_X86_64_GOT64: | |
1638 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1639 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1640 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1641 | gold_assert(have_got_offset); |
1642 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1643 | break; |
1644 | ||
1645 | case elfcpp::R_X86_64_GOTPC64: | |
1646 | { | |
1647 | gold_assert(gsym); | |
1648 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1649 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1650 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1651 | } | |
1652 | break; | |
1653 | ||
2e30d253 ILT |
1654 | case elfcpp::R_X86_64_GOTOFF64: |
1655 | { | |
1656 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1657 | value = (psymval->value(object, 0) | |
96f2030e | 1658 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1659 | Relocate_functions<64, false>::rela64(view, value, addend); |
1660 | } | |
1661 | break; | |
1662 | ||
1663 | case elfcpp::R_X86_64_GOTPCREL: | |
1664 | { | |
0ffd9845 ILT |
1665 | gold_assert(have_got_offset); |
1666 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1667 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1668 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1669 | } |
1670 | break; | |
1671 | ||
e822f2b1 ILT |
1672 | case elfcpp::R_X86_64_GOTPCREL64: |
1673 | { | |
0ffd9845 ILT |
1674 | gold_assert(have_got_offset); |
1675 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1676 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1677 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1678 | } |
1679 | break; | |
1680 | ||
2e30d253 ILT |
1681 | case elfcpp::R_X86_64_COPY: |
1682 | case elfcpp::R_X86_64_GLOB_DAT: | |
1683 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1684 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1685 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1686 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1687 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1688 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1689 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1690 | _("unexpected reloc %u in object file"), | |
1691 | r_type); | |
2e30d253 ILT |
1692 | break; |
1693 | ||
d61c17ea | 1694 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1695 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1696 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1697 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1698 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1699 | case elfcpp::R_X86_64_DTPOFF32: |
1700 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1701 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1702 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1703 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1704 | view, address, view_size); | |
2e30d253 | 1705 | break; |
2e30d253 | 1706 | |
fdc2f80f ILT |
1707 | case elfcpp::R_X86_64_SIZE32: |
1708 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1709 | default: |
75f2446e ILT |
1710 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1711 | _("unsupported reloc %u"), | |
1712 | r_type); | |
2e30d253 ILT |
1713 | break; |
1714 | } | |
1715 | ||
1716 | return true; | |
1717 | } | |
1718 | ||
1719 | // Perform a TLS relocation. | |
1720 | ||
1721 | inline void | |
d61c17ea | 1722 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1723 | Target_x86_64* target, |
d61c17ea | 1724 | size_t relnum, |
72ec2876 | 1725 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1726 | unsigned int r_type, |
1727 | const Sized_symbol<64>* gsym, | |
1728 | const Symbol_value<64>* psymval, | |
1729 | unsigned char* view, | |
6a41d30b | 1730 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1731 | section_size_type view_size) |
2e30d253 | 1732 | { |
2e30d253 | 1733 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1734 | |
1735 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1736 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1737 | |
1738 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1739 | ||
1740 | const bool is_final = (gsym == NULL | |
8851ecca | 1741 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1742 | : gsym->final_value_is_known()); |
e041f13d ILT |
1743 | const tls::Tls_optimization optimized_type |
1744 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1745 | switch (r_type) |
1746 | { | |
56622147 ILT |
1747 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1748 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d ILT |
1749 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1750 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2e30d253 | 1751 | { |
7bf1f802 | 1752 | gold_assert(tls_segment != NULL); |
2e30d253 | 1753 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1754 | rela, r_type, value, view, |
2e30d253 ILT |
1755 | view_size); |
1756 | break; | |
1757 | } | |
7bf1f802 ILT |
1758 | else |
1759 | { | |
1760 | unsigned int got_offset; | |
1761 | if (gsym != NULL) | |
1762 | { | |
0a65a3a7 CC |
1763 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_PAIR)); |
1764 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_PAIR) | |
1765 | - target->got_size()); | |
7bf1f802 ILT |
1766 | } |
1767 | else | |
1768 | { | |
1769 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1770 | gold_assert(object->local_has_got_offset(r_sym, |
1771 | GOT_TYPE_TLS_PAIR)); | |
1772 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_PAIR) | |
7bf1f802 ILT |
1773 | - target->got_size()); |
1774 | } | |
1775 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1776 | { | |
1777 | gold_assert(tls_segment != NULL); | |
1778 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
1779 | got_offset, view, view_size); | |
1780 | break; | |
1781 | } | |
1782 | else if (optimized_type == tls::TLSOPT_NONE) | |
1783 | { | |
1784 | // Relocate the field with the offset of the pair of GOT | |
1785 | // entries. | |
6a41d30b ILT |
1786 | value = target->got_plt_section()->address() + got_offset; |
1787 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1788 | address); | |
7bf1f802 ILT |
1789 | break; |
1790 | } | |
1791 | } | |
72ec2876 | 1792 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1793 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1794 | break; |
1795 | ||
56622147 | 1796 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
e041f13d ILT |
1797 | if (optimized_type == tls::TLSOPT_TO_LE) |
1798 | { | |
7bf1f802 | 1799 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
1800 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
1801 | value, view, view_size); | |
1802 | break; | |
e041f13d | 1803 | } |
7bf1f802 ILT |
1804 | else if (optimized_type == tls::TLSOPT_NONE) |
1805 | { | |
1806 | // Relocate the field with the offset of the GOT entry for | |
1807 | // the module index. | |
1808 | unsigned int got_offset; | |
31d60480 ILT |
1809 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1810 | - target->got_size()); | |
6a41d30b ILT |
1811 | value = target->got_plt_section()->address() + got_offset; |
1812 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1813 | address); | |
7bf1f802 ILT |
1814 | break; |
1815 | } | |
72ec2876 | 1816 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1817 | _("unsupported reloc %u"), r_type); |
2e30d253 | 1818 | break; |
0ffd9845 ILT |
1819 | |
1820 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 1821 | gold_assert(tls_segment != NULL); |
e041f13d | 1822 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
1823 | value -= tls_segment->memsz(); |
1824 | Relocate_functions<64, false>::rela32(view, value, 0); | |
0ffd9845 ILT |
1825 | break; |
1826 | ||
1827 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 1828 | gold_assert(tls_segment != NULL); |
e041f13d | 1829 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
1830 | value -= tls_segment->memsz(); |
1831 | Relocate_functions<64, false>::rela64(view, value, 0); | |
0ffd9845 | 1832 | break; |
2e30d253 | 1833 | |
56622147 ILT |
1834 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1835 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1836 | { | |
7bf1f802 | 1837 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1838 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1839 | rela, r_type, value, view, | |
1840 | view_size); | |
1841 | break; | |
1842 | } | |
7bf1f802 ILT |
1843 | else if (optimized_type == tls::TLSOPT_NONE) |
1844 | { | |
1845 | // Relocate the field with the offset of the GOT entry for | |
1846 | // the tp-relative offset of the symbol. | |
1847 | unsigned int got_offset; | |
1848 | if (gsym != NULL) | |
1849 | { | |
0a65a3a7 CC |
1850 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
1851 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
1852 | - target->got_size()); | |
7bf1f802 ILT |
1853 | } |
1854 | else | |
1855 | { | |
1856 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1857 | gold_assert(object->local_has_got_offset(r_sym, |
1858 | GOT_TYPE_TLS_OFFSET)); | |
1859 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
1860 | - target->got_size()); |
1861 | } | |
6a41d30b ILT |
1862 | value = target->got_plt_section()->address() + got_offset; |
1863 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
1864 | break; |
1865 | } | |
56622147 ILT |
1866 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1867 | _("unsupported reloc type %u"), | |
1868 | r_type); | |
1869 | break; | |
0ffd9845 | 1870 | |
56622147 | 1871 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b ILT |
1872 | value -= tls_segment->memsz(); |
1873 | Relocate_functions<64, false>::rela32(view, value, 0); | |
56622147 | 1874 | break; |
2e30d253 | 1875 | } |
2e30d253 ILT |
1876 | } |
1877 | ||
7bf1f802 ILT |
1878 | // Do a relocation in which we convert a TLS General-Dynamic to an |
1879 | // Initial-Exec. | |
1880 | ||
1881 | inline void | |
1882 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
1883 | size_t relnum, | |
1884 | Output_segment* tls_segment, | |
1885 | const elfcpp::Rela<64, false>& rela, | |
1886 | unsigned int, | |
1887 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1888 | unsigned char* view, | |
fe8718a4 | 1889 | section_size_type view_size) |
7bf1f802 ILT |
1890 | { |
1891 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
1892 | // .word 0x6666; rex64; call __tls_get_addr | |
1893 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
1894 | ||
1895 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
1896 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
1897 | ||
1898 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1899 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1900 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1901 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
1902 | ||
1903 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
1904 | ||
6a41d30b | 1905 | value -= tls_segment->memsz(); |
7bf1f802 ILT |
1906 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
1907 | ||
1908 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1909 | // We can skip it. | |
1910 | this->skip_call_tls_get_addr_ = true; | |
1911 | } | |
1912 | ||
e041f13d | 1913 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
1914 | // Local-Exec. |
1915 | ||
1916 | inline void | |
d61c17ea ILT |
1917 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
1918 | size_t relnum, | |
1919 | Output_segment* tls_segment, | |
72ec2876 | 1920 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1921 | unsigned int, |
1922 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1923 | unsigned char* view, | |
fe8718a4 | 1924 | section_size_type view_size) |
2e30d253 | 1925 | { |
0ffd9845 ILT |
1926 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
1927 | // .word 0x6666; rex64; call __tls_get_addr | |
1928 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 1929 | |
72ec2876 ILT |
1930 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
1931 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 1932 | |
72ec2876 ILT |
1933 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1934 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1935 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1936 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 1937 | |
0ffd9845 | 1938 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 1939 | |
6a41d30b | 1940 | value -= tls_segment->memsz(); |
0ffd9845 | 1941 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
1942 | |
1943 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1944 | // We can skip it. | |
1945 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1946 | } |
1947 | ||
2e30d253 | 1948 | inline void |
72ec2876 ILT |
1949 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
1950 | size_t relnum, | |
1951 | Output_segment*, | |
1952 | const elfcpp::Rela<64, false>& rela, | |
1953 | unsigned int, | |
1954 | elfcpp::Elf_types<64>::Elf_Addr, | |
1955 | unsigned char* view, | |
fe8718a4 | 1956 | section_size_type view_size) |
2e30d253 | 1957 | { |
72ec2876 ILT |
1958 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
1959 | // ... leq foo@dtpoff(%rax),%reg | |
1960 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 1961 | |
72ec2876 ILT |
1962 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
1963 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 1964 | |
72ec2876 ILT |
1965 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1966 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
1967 | ||
1968 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
1969 | ||
1970 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
1971 | ||
1972 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1973 | // We can skip it. | |
1974 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1975 | } |
1976 | ||
56622147 ILT |
1977 | // Do a relocation in which we convert a TLS Initial-Exec to a |
1978 | // Local-Exec. | |
1979 | ||
1980 | inline void | |
1981 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
1982 | size_t relnum, | |
1983 | Output_segment* tls_segment, | |
1984 | const elfcpp::Rela<64, false>& rela, | |
1985 | unsigned int, | |
1986 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1987 | unsigned char* view, | |
fe8718a4 | 1988 | section_size_type view_size) |
56622147 ILT |
1989 | { |
1990 | // We need to examine the opcodes to figure out which instruction we | |
1991 | // are looking at. | |
1992 | ||
1993 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
1994 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
1995 | ||
1996 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
1997 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
1998 | ||
1999 | unsigned char op1 = view[-3]; | |
2000 | unsigned char op2 = view[-2]; | |
2001 | unsigned char op3 = view[-1]; | |
2002 | unsigned char reg = op3 >> 3; | |
2003 | ||
2004 | if (op2 == 0x8b) | |
2005 | { | |
2006 | // movq | |
2007 | if (op1 == 0x4c) | |
2008 | view[-3] = 0x49; | |
2009 | view[-2] = 0xc7; | |
2010 | view[-1] = 0xc0 | reg; | |
2011 | } | |
2012 | else if (reg == 4) | |
2013 | { | |
2014 | // Special handling for %rsp. | |
2015 | if (op1 == 0x4c) | |
2016 | view[-3] = 0x49; | |
2017 | view[-2] = 0x81; | |
2018 | view[-1] = 0xc0 | reg; | |
2019 | } | |
2020 | else | |
2021 | { | |
2022 | // addq | |
2023 | if (op1 == 0x4c) | |
2024 | view[-3] = 0x4d; | |
2025 | view[-2] = 0x8d; | |
2026 | view[-1] = 0x80 | reg | (reg << 3); | |
2027 | } | |
2028 | ||
6a41d30b | 2029 | value -= tls_segment->memsz(); |
56622147 ILT |
2030 | Relocate_functions<64, false>::rela32(view, value, 0); |
2031 | } | |
2032 | ||
2e30d253 ILT |
2033 | // Relocate section data. |
2034 | ||
2035 | void | |
2036 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2037 | unsigned int sh_type, |
2038 | const unsigned char* prelocs, | |
2039 | size_t reloc_count, | |
730cdc88 ILT |
2040 | Output_section* output_section, |
2041 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2042 | unsigned char* view, |
2043 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2044 | section_size_type view_size) |
2e30d253 ILT |
2045 | { |
2046 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2047 | ||
2048 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2049 | Target_x86_64::Relocate>( | |
2050 | relinfo, | |
2051 | this, | |
2052 | prelocs, | |
2053 | reloc_count, | |
730cdc88 ILT |
2054 | output_section, |
2055 | needs_special_offset_handling, | |
2e30d253 ILT |
2056 | view, |
2057 | address, | |
2058 | view_size); | |
2059 | } | |
2060 | ||
6a74a719 ILT |
2061 | // Return the size of a relocation while scanning during a relocatable |
2062 | // link. | |
2063 | ||
2064 | unsigned int | |
2065 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2066 | unsigned int r_type, | |
2067 | Relobj* object) | |
2068 | { | |
2069 | switch (r_type) | |
2070 | { | |
2071 | case elfcpp::R_X86_64_NONE: | |
2072 | case elfcpp::R_386_GNU_VTINHERIT: | |
2073 | case elfcpp::R_386_GNU_VTENTRY: | |
2074 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2075 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2076 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2077 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2078 | case elfcpp::R_X86_64_DTPOFF32: | |
2079 | case elfcpp::R_X86_64_DTPOFF64: | |
2080 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2081 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2082 | return 0; | |
2083 | ||
2084 | case elfcpp::R_X86_64_64: | |
2085 | case elfcpp::R_X86_64_PC64: | |
2086 | case elfcpp::R_X86_64_GOTOFF64: | |
2087 | case elfcpp::R_X86_64_GOTPC64: | |
2088 | case elfcpp::R_X86_64_PLTOFF64: | |
2089 | case elfcpp::R_X86_64_GOT64: | |
2090 | case elfcpp::R_X86_64_GOTPCREL64: | |
2091 | case elfcpp::R_X86_64_GOTPCREL: | |
2092 | case elfcpp::R_X86_64_GOTPLT64: | |
2093 | return 8; | |
2094 | ||
2095 | case elfcpp::R_X86_64_32: | |
2096 | case elfcpp::R_X86_64_32S: | |
2097 | case elfcpp::R_X86_64_PC32: | |
2098 | case elfcpp::R_X86_64_PLT32: | |
2099 | case elfcpp::R_X86_64_GOTPC32: | |
2100 | case elfcpp::R_X86_64_GOT32: | |
2101 | return 4; | |
2102 | ||
2103 | case elfcpp::R_X86_64_16: | |
2104 | case elfcpp::R_X86_64_PC16: | |
2105 | return 2; | |
2106 | ||
2107 | case elfcpp::R_X86_64_8: | |
2108 | case elfcpp::R_X86_64_PC8: | |
2109 | return 1; | |
2110 | ||
2111 | case elfcpp::R_X86_64_COPY: | |
2112 | case elfcpp::R_X86_64_GLOB_DAT: | |
2113 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2114 | case elfcpp::R_X86_64_RELATIVE: | |
2115 | // These are outstanding tls relocs, which are unexpected when linking | |
2116 | case elfcpp::R_X86_64_TPOFF64: | |
2117 | case elfcpp::R_X86_64_DTPMOD64: | |
2118 | case elfcpp::R_X86_64_TLSDESC: | |
2119 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2120 | return 0; | |
2121 | ||
2122 | case elfcpp::R_X86_64_SIZE32: | |
2123 | case elfcpp::R_X86_64_SIZE64: | |
2124 | default: | |
2125 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2126 | return 0; | |
2127 | } | |
2128 | } | |
2129 | ||
2130 | // Scan the relocs during a relocatable link. | |
2131 | ||
2132 | void | |
2133 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2134 | Symbol_table* symtab, | |
2135 | Layout* layout, | |
2136 | Sized_relobj<64, false>* object, | |
2137 | unsigned int data_shndx, | |
2138 | unsigned int sh_type, | |
2139 | const unsigned char* prelocs, | |
2140 | size_t reloc_count, | |
2141 | Output_section* output_section, | |
2142 | bool needs_special_offset_handling, | |
2143 | size_t local_symbol_count, | |
2144 | const unsigned char* plocal_symbols, | |
2145 | Relocatable_relocs* rr) | |
2146 | { | |
2147 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2148 | ||
2149 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2150 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2151 | ||
7019cd25 | 2152 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2153 | Scan_relocatable_relocs>( |
2154 | options, | |
2155 | symtab, | |
2156 | layout, | |
2157 | object, | |
2158 | data_shndx, | |
2159 | prelocs, | |
2160 | reloc_count, | |
2161 | output_section, | |
2162 | needs_special_offset_handling, | |
2163 | local_symbol_count, | |
2164 | plocal_symbols, | |
2165 | rr); | |
2166 | } | |
2167 | ||
2168 | // Relocate a section during a relocatable link. | |
2169 | ||
2170 | void | |
2171 | Target_x86_64::relocate_for_relocatable( | |
2172 | const Relocate_info<64, false>* relinfo, | |
2173 | unsigned int sh_type, | |
2174 | const unsigned char* prelocs, | |
2175 | size_t reloc_count, | |
2176 | Output_section* output_section, | |
2177 | off_t offset_in_output_section, | |
2178 | const Relocatable_relocs* rr, | |
2179 | unsigned char* view, | |
2180 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2181 | section_size_type view_size, | |
2182 | unsigned char* reloc_view, | |
2183 | section_size_type reloc_view_size) | |
2184 | { | |
2185 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2186 | ||
7019cd25 | 2187 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2188 | relinfo, |
2189 | prelocs, | |
2190 | reloc_count, | |
2191 | output_section, | |
2192 | offset_in_output_section, | |
2193 | rr, | |
2194 | view, | |
2195 | view_address, | |
2196 | view_size, | |
2197 | reloc_view, | |
2198 | reloc_view_size); | |
2199 | } | |
2200 | ||
4fb6c25d ILT |
2201 | // Return the value to use for a dynamic which requires special |
2202 | // treatment. This is how we support equality comparisons of function | |
2203 | // pointers across shared library boundaries, as described in the | |
2204 | // processor specific ABI supplement. | |
2205 | ||
2206 | uint64_t | |
2207 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2208 | { | |
2209 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2210 | return this->plt_section()->address() + gsym->plt_offset(); | |
2211 | } | |
2212 | ||
2e30d253 ILT |
2213 | // Return a string used to fill a code section with nops to take up |
2214 | // the specified length. | |
2215 | ||
2216 | std::string | |
8851ecca | 2217 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2218 | { |
2219 | if (length >= 16) | |
2220 | { | |
2221 | // Build a jmpq instruction to skip over the bytes. | |
2222 | unsigned char jmp[5]; | |
2223 | jmp[0] = 0xe9; | |
04bf7072 | 2224 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2225 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2226 | + std::string(length - 5, '\0')); | |
2227 | } | |
2228 | ||
2229 | // Nop sequences of various lengths. | |
2230 | const char nop1[1] = { 0x90 }; // nop | |
2231 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2232 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2233 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2234 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2235 | 0x00 }; // leal 0(%esi,1),%esi | |
2236 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2237 | 0x00, 0x00 }; | |
2238 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2239 | 0x00, 0x00, 0x00 }; | |
2240 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2241 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2242 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2243 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2244 | 0x00 }; | |
2245 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2246 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2247 | 0x00, 0x00 }; | |
2248 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2249 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2250 | 0x00, 0x00, 0x00 }; | |
2251 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2252 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2253 | 0x00, 0x00, 0x00, 0x00 }; | |
2254 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2255 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2256 | 0x27, 0x00, 0x00, 0x00, | |
2257 | 0x00 }; | |
2258 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2259 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2260 | 0xbc, 0x27, 0x00, 0x00, | |
2261 | 0x00, 0x00 }; | |
2262 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2263 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2264 | 0x90, 0x90, 0x90, 0x90, | |
2265 | 0x90, 0x90, 0x90 }; | |
2266 | ||
2267 | const char* nops[16] = { | |
2268 | NULL, | |
2269 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2270 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2271 | }; | |
2272 | ||
2273 | return std::string(nops[length], length); | |
2274 | } | |
2275 | ||
2276 | // The selector for x86_64 object files. | |
2277 | ||
2278 | class Target_selector_x86_64 : public Target_selector | |
2279 | { | |
2280 | public: | |
2281 | Target_selector_x86_64() | |
e96caa79 | 2282 | : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64") |
2e30d253 ILT |
2283 | { } |
2284 | ||
2285 | Target* | |
e96caa79 ILT |
2286 | do_instantiate_target() |
2287 | { return new Target_x86_64(); } | |
2e30d253 ILT |
2288 | }; |
2289 | ||
2e30d253 ILT |
2290 | Target_selector_x86_64 target_selector_x86_64; |
2291 | ||
2292 | } // End anonymous namespace. |