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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 | |
c2b45e22 | 230 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
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, | |
c2b45e22 | 237 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 238 | section_size_type view_size); |
7bf1f802 | 239 | |
56622147 ILT |
240 | // Do a TLS General-Dynamic to Local-Exec transition. |
241 | inline void | |
242 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
243 | Output_segment* tls_segment, |
244 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
245 | elfcpp::Elf_types<64>::Elf_Addr value, | |
246 | unsigned char* view, | |
fe8718a4 | 247 | section_size_type view_size); |
2e30d253 | 248 | |
c2b45e22 CC |
249 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
250 | inline void | |
251 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
252 | Output_segment* tls_segment, | |
253 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
254 | elfcpp::Elf_types<64>::Elf_Addr value, | |
255 | unsigned char* view, | |
256 | elfcpp::Elf_types<64>::Elf_Addr, | |
257 | section_size_type view_size); | |
258 | ||
259 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
260 | inline void | |
261 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
262 | Output_segment* tls_segment, | |
263 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
264 | elfcpp::Elf_types<64>::Elf_Addr value, | |
265 | unsigned char* view, | |
266 | section_size_type view_size); | |
267 | ||
56622147 | 268 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 269 | inline void |
56622147 | 270 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
271 | Output_segment* tls_segment, |
272 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
273 | elfcpp::Elf_types<64>::Elf_Addr value, | |
274 | unsigned char* view, | |
fe8718a4 | 275 | section_size_type view_size); |
2e30d253 | 276 | |
56622147 ILT |
277 | // Do a TLS Initial-Exec to Local-Exec transition. |
278 | static inline void | |
279 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
280 | Output_segment* tls_segment, |
281 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
282 | elfcpp::Elf_types<64>::Elf_Addr value, | |
283 | unsigned char* view, | |
fe8718a4 | 284 | section_size_type view_size); |
2e30d253 ILT |
285 | |
286 | // This is set if we should skip the next reloc, which should be a | |
287 | // PLT32 reloc against ___tls_get_addr. | |
288 | bool skip_call_tls_get_addr_; | |
289 | }; | |
290 | ||
6a74a719 ILT |
291 | // A class which returns the size required for a relocation type, |
292 | // used while scanning relocs during a relocatable link. | |
293 | class Relocatable_size_for_reloc | |
294 | { | |
295 | public: | |
296 | unsigned int | |
297 | get_size_for_reloc(unsigned int, Relobj*); | |
298 | }; | |
299 | ||
2e30d253 ILT |
300 | // Adjust TLS relocation type based on the options and whether this |
301 | // is a local symbol. | |
e041f13d | 302 | static tls::Tls_optimization |
2e30d253 ILT |
303 | optimize_tls_reloc(bool is_final, int r_type); |
304 | ||
305 | // Get the GOT section, creating it if necessary. | |
306 | Output_data_got<64, false>* | |
307 | got_section(Symbol_table*, Layout*); | |
308 | ||
96f2030e ILT |
309 | // Get the GOT PLT section. |
310 | Output_data_space* | |
311 | got_plt_section() const | |
312 | { | |
313 | gold_assert(this->got_plt_ != NULL); | |
314 | return this->got_plt_; | |
315 | } | |
316 | ||
c2b45e22 CC |
317 | // Create the PLT section. |
318 | void | |
319 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
320 | ||
2e30d253 ILT |
321 | // Create a PLT entry for a global symbol. |
322 | void | |
323 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
324 | ||
c2b45e22 CC |
325 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
326 | void | |
327 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
328 | ||
31d60480 ILT |
329 | // Create a GOT entry for the TLS module index. |
330 | unsigned int | |
331 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
332 | Sized_relobj<64, false>* object); | |
333 | ||
2e30d253 ILT |
334 | // Get the PLT section. |
335 | Output_data_plt_x86_64* | |
336 | plt_section() const | |
337 | { | |
338 | gold_assert(this->plt_ != NULL); | |
339 | return this->plt_; | |
340 | } | |
341 | ||
342 | // Get the dynamic reloc section, creating it if necessary. | |
343 | Reloc_section* | |
0ffd9845 | 344 | rela_dyn_section(Layout*); |
2e30d253 | 345 | |
d61c6bd4 ILT |
346 | // Return true if the symbol may need a COPY relocation. |
347 | // References from an executable object to non-function symbols | |
348 | // defined in a dynamic object may need a COPY relocation. | |
349 | bool | |
350 | may_need_copy_reloc(Symbol* gsym) | |
351 | { | |
8851ecca | 352 | return (!parameters->options().shared() |
d61c6bd4 ILT |
353 | && gsym->is_from_dynobj() |
354 | && gsym->type() != elfcpp::STT_FUNC); | |
355 | } | |
356 | ||
2e30d253 ILT |
357 | // Copy a relocation against a global symbol. |
358 | void | |
359 | copy_reloc(const General_options*, Symbol_table*, Layout*, | |
360 | Sized_relobj<64, false>*, unsigned int, | |
4f4c5f80 | 361 | Output_section*, Symbol*, const elfcpp::Rela<64, false>&); |
2e30d253 ILT |
362 | |
363 | // Information about this specific target which we pass to the | |
364 | // general Target structure. | |
365 | static const Target::Target_info x86_64_info; | |
366 | ||
0a65a3a7 CC |
367 | enum Got_type |
368 | { | |
369 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
370 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
371 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
372 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
373 | }; | |
374 | ||
2e30d253 ILT |
375 | // The GOT section. |
376 | Output_data_got<64, false>* got_; | |
377 | // The PLT section. | |
378 | Output_data_plt_x86_64* plt_; | |
379 | // The GOT PLT section. | |
380 | Output_data_space* got_plt_; | |
381 | // The dynamic reloc section. | |
0ffd9845 | 382 | Reloc_section* rela_dyn_; |
2e30d253 ILT |
383 | // Relocs saved to avoid a COPY reloc. |
384 | Copy_relocs<64, false>* copy_relocs_; | |
385 | // Space for variables copied with a COPY reloc. | |
386 | Output_data_space* dynbss_; | |
c2b45e22 | 387 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 388 | unsigned int got_mod_index_offset_; |
2e30d253 ILT |
389 | }; |
390 | ||
391 | const Target::Target_info Target_x86_64::x86_64_info = | |
392 | { | |
393 | 64, // size | |
394 | false, // is_big_endian | |
395 | elfcpp::EM_X86_64, // machine_code | |
396 | false, // has_make_symbol | |
397 | false, // has_resolve | |
398 | true, // has_code_fill | |
35cdfc9a | 399 | true, // is_default_stack_executable |
0864d551 | 400 | '\0', // wrap_char |
2e30d253 | 401 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 402 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
403 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
404 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
405 | }; |
406 | ||
407 | // Get the GOT section, creating it if necessary. | |
408 | ||
409 | Output_data_got<64, false>* | |
410 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
411 | { | |
412 | if (this->got_ == NULL) | |
413 | { | |
414 | gold_assert(symtab != NULL && layout != NULL); | |
415 | ||
416 | this->got_ = new Output_data_got<64, false>(); | |
417 | ||
418 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
419 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
420 | this->got_); | |
421 | ||
422 | // The old GNU linker creates a .got.plt section. We just | |
423 | // create another set of data in the .got section. Note that we | |
424 | // always create a PLT if we create a GOT, although the PLT | |
425 | // might be empty. | |
2e30d253 ILT |
426 | this->got_plt_ = new Output_data_space(8); |
427 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
428 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
429 | this->got_plt_); | |
430 | ||
431 | // The first three entries are reserved. | |
27bc2bce | 432 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
433 | |
434 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 435 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
436 | this->got_plt_, |
437 | 0, 0, elfcpp::STT_OBJECT, | |
438 | elfcpp::STB_LOCAL, | |
439 | elfcpp::STV_HIDDEN, 0, | |
440 | false, false); | |
441 | } | |
442 | ||
443 | return this->got_; | |
444 | } | |
445 | ||
446 | // Get the dynamic reloc section, creating it if necessary. | |
447 | ||
448 | Target_x86_64::Reloc_section* | |
0ffd9845 | 449 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 450 | { |
0ffd9845 | 451 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
452 | { |
453 | gold_assert(layout != NULL); | |
0ffd9845 | 454 | this->rela_dyn_ = new Reloc_section(); |
2e30d253 | 455 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 456 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 457 | } |
0ffd9845 | 458 | return this->rela_dyn_; |
2e30d253 ILT |
459 | } |
460 | ||
461 | // A class to handle the PLT data. | |
462 | ||
463 | class Output_data_plt_x86_64 : public Output_section_data | |
464 | { | |
465 | public: | |
466 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
467 | ||
c2b45e22 CC |
468 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
469 | Output_data_space*); | |
2e30d253 ILT |
470 | |
471 | // Add an entry to the PLT. | |
472 | void | |
473 | add_entry(Symbol* gsym); | |
474 | ||
c2b45e22 CC |
475 | // Add the reserved TLSDESC_PLT entry to the PLT. |
476 | void | |
477 | reserve_tlsdesc_entry(unsigned int got_offset) | |
478 | { this->tlsdesc_got_offset_ = got_offset; } | |
479 | ||
480 | // Return true if a TLSDESC_PLT entry has been reserved. | |
481 | bool | |
482 | has_tlsdesc_entry() const | |
483 | { return this->tlsdesc_got_offset_ != -1U; } | |
484 | ||
485 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
486 | unsigned int | |
487 | get_tlsdesc_got_offset() const | |
488 | { return this->tlsdesc_got_offset_; } | |
489 | ||
490 | // Return the offset of the reserved TLSDESC_PLT entry. | |
491 | unsigned int | |
492 | get_tlsdesc_plt_offset() const | |
493 | { return (this->count_ + 1) * plt_entry_size; } | |
494 | ||
2e30d253 ILT |
495 | // Return the .rel.plt section data. |
496 | const Reloc_section* | |
497 | rel_plt() const | |
498 | { return this->rel_; } | |
499 | ||
500 | protected: | |
501 | void | |
502 | do_adjust_output_section(Output_section* os); | |
503 | ||
504 | private: | |
505 | // The size of an entry in the PLT. | |
506 | static const int plt_entry_size = 16; | |
507 | ||
508 | // The first entry in the PLT. | |
509 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
510 | // procedure linkage table for both programs and shared objects." | |
511 | static unsigned char first_plt_entry[plt_entry_size]; | |
512 | ||
513 | // Other entries in the PLT for an executable. | |
514 | static unsigned char plt_entry[plt_entry_size]; | |
515 | ||
c2b45e22 CC |
516 | // The reserved TLSDESC entry in the PLT for an executable. |
517 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
518 | ||
2e30d253 ILT |
519 | // Set the final size. |
520 | void | |
c2b45e22 | 521 | set_final_data_size(); |
2e30d253 ILT |
522 | |
523 | // Write out the PLT data. | |
524 | void | |
525 | do_write(Output_file*); | |
526 | ||
527 | // The reloc section. | |
528 | Reloc_section* rel_; | |
c2b45e22 CC |
529 | // The .got section. |
530 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
531 | // The .got.plt section. |
532 | Output_data_space* got_plt_; | |
533 | // The number of PLT entries. | |
534 | unsigned int count_; | |
c2b45e22 CC |
535 | // Offset of the reserved TLSDESC_GOT entry when needed. |
536 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
537 | }; |
538 | ||
539 | // Create the PLT section. The ordinary .got section is an argument, | |
540 | // since we need to refer to the start. We also create our own .got | |
541 | // section just for PLT entries. | |
542 | ||
543 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 544 | Output_data_got<64, false>* got, |
2e30d253 | 545 | Output_data_space* got_plt) |
c2b45e22 CC |
546 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
547 | tlsdesc_got_offset_(-1U) | |
2e30d253 ILT |
548 | { |
549 | this->rel_ = new Reloc_section(); | |
550 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
551 | elfcpp::SHF_ALLOC, this->rel_); | |
552 | } | |
553 | ||
554 | void | |
555 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
556 | { | |
557 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
558 | // linker, and so do we. | |
559 | os->set_entsize(4); | |
560 | } | |
561 | ||
562 | // Add an entry to the PLT. | |
563 | ||
564 | void | |
565 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
566 | { | |
567 | gold_assert(!gsym->has_plt_offset()); | |
568 | ||
569 | // Note that when setting the PLT offset we skip the initial | |
570 | // reserved PLT entry. | |
571 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
572 | ||
573 | ++this->count_; | |
574 | ||
fe8718a4 | 575 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
576 | |
577 | // Every PLT entry needs a GOT entry which points back to the PLT | |
578 | // entry (this will be changed by the dynamic linker, normally | |
579 | // lazily when the function is called). | |
27bc2bce | 580 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
581 | |
582 | // Every PLT entry needs a reloc. | |
583 | gsym->set_needs_dynsym_entry(); | |
584 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
585 | got_offset, 0); | |
586 | ||
587 | // Note that we don't need to save the symbol. The contents of the | |
588 | // PLT are independent of which symbols are used. The symbols only | |
589 | // appear in the relocations. | |
590 | } | |
591 | ||
c2b45e22 CC |
592 | // Set the final size. |
593 | void | |
594 | Output_data_plt_x86_64::set_final_data_size() | |
595 | { | |
596 | unsigned int count = this->count_; | |
597 | if (this->has_tlsdesc_entry()) | |
598 | ++count; | |
599 | this->set_data_size((count + 1) * plt_entry_size); | |
600 | } | |
601 | ||
2e30d253 ILT |
602 | // The first entry in the PLT for an executable. |
603 | ||
604 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
605 | { | |
606 | // From AMD64 ABI Draft 0.98, page 76 | |
607 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 608 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
609 | 0xff, 0x25, // jmp indirect |
610 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
611 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
612 | }; | |
613 | ||
614 | // Subsequent entries in the PLT for an executable. | |
615 | ||
616 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
617 | { | |
618 | // From AMD64 ABI Draft 0.98, page 76 | |
619 | 0xff, 0x25, // jmpq indirect | |
620 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
621 | 0x68, // pushq immediate | |
622 | 0, 0, 0, 0, // replaced with offset into relocation table | |
623 | 0xe9, // jmpq relative | |
624 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
625 | }; | |
626 | ||
c2b45e22 CC |
627 | // The reserved TLSDESC entry in the PLT for an executable. |
628 | ||
629 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
630 | { | |
631 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
632 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
633 | 0xff, 0x35, // pushq x(%rip) | |
634 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
635 | 0xff, 0x25, // jmpq *y(%rip) | |
636 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
637 | 0x0f, 0x1f, // nop | |
638 | 0x40, 0 | |
639 | }; | |
640 | ||
2e30d253 ILT |
641 | // Write out the PLT. This uses the hand-coded instructions above, |
642 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
643 | ||
644 | void | |
645 | Output_data_plt_x86_64::do_write(Output_file* of) | |
646 | { | |
647 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
648 | const section_size_type oview_size = |
649 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
650 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
651 | ||
652 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
653 | const section_size_type got_size = |
654 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
655 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
656 | got_size); | |
657 | ||
658 | unsigned char* pov = oview; | |
659 | ||
c2b45e22 | 660 | // The base address of the .plt section. |
2e30d253 | 661 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); |
c2b45e22 CC |
662 | // The base address of the .got section. |
663 | elfcpp::Elf_types<32>::Elf_Addr got_base = this->got_->address(); | |
664 | // The base address of the PLT portion of the .got section, | |
665 | // which is where the GOT pointer will point, and where the | |
666 | // three reserved GOT entries are located. | |
2e30d253 ILT |
667 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); |
668 | ||
669 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd ILT |
670 | // We do a jmp relative to the PC at the end of this instruction. |
671 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 8 | |
672 | - (plt_address + 6)); | |
673 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 16 | |
674 | - (plt_address + 12)); | |
2e30d253 ILT |
675 | pov += plt_entry_size; |
676 | ||
677 | unsigned char* got_pov = got_view; | |
678 | ||
679 | memset(got_pov, 0, 24); | |
680 | got_pov += 24; | |
681 | ||
682 | unsigned int plt_offset = plt_entry_size; | |
683 | unsigned int got_offset = 24; | |
684 | const unsigned int count = this->count_; | |
685 | for (unsigned int plt_index = 0; | |
686 | plt_index < count; | |
687 | ++plt_index, | |
688 | pov += plt_entry_size, | |
689 | got_pov += 8, | |
690 | plt_offset += plt_entry_size, | |
691 | got_offset += 8) | |
692 | { | |
693 | // Set and adjust the PLT entry itself. | |
694 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
695 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
696 | (got_address + got_offset | |
697 | - (plt_address + plt_offset | |
698 | + 6))); | |
2e30d253 ILT |
699 | |
700 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
701 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
702 | - (plt_offset + plt_entry_size)); | |
703 | ||
704 | // Set the entry in the GOT. | |
705 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
706 | } | |
707 | ||
c2b45e22 CC |
708 | if (this->has_tlsdesc_entry()) |
709 | { | |
710 | // Set and adjust the reserved TLSDESC PLT entry. | |
711 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
712 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
713 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
714 | (got_address + 8 | |
715 | - (plt_address + plt_offset | |
716 | + 6))); | |
717 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
718 | (got_base | |
719 | + tlsdesc_got_offset | |
720 | - (plt_address + plt_offset | |
721 | + 12))); | |
722 | pov += plt_entry_size; | |
723 | } | |
724 | ||
fe8718a4 ILT |
725 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
726 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
727 | |
728 | of->write_output_view(offset, oview_size, oview); | |
729 | of->write_output_view(got_file_offset, got_size, got_view); | |
730 | } | |
731 | ||
c2b45e22 | 732 | // Create the PLT section. |
2e30d253 ILT |
733 | |
734 | void | |
c2b45e22 | 735 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 736 | { |
2e30d253 ILT |
737 | if (this->plt_ == NULL) |
738 | { | |
739 | // Create the GOT sections first. | |
740 | this->got_section(symtab, layout); | |
741 | ||
c2b45e22 CC |
742 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
743 | this->got_plt_); | |
2e30d253 ILT |
744 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
745 | (elfcpp::SHF_ALLOC | |
746 | | elfcpp::SHF_EXECINSTR), | |
747 | this->plt_); | |
748 | } | |
c2b45e22 CC |
749 | } |
750 | ||
751 | // Create a PLT entry for a global symbol. | |
752 | ||
753 | void | |
754 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
755 | Symbol* gsym) | |
756 | { | |
757 | if (gsym->has_plt_offset()) | |
758 | return; | |
759 | ||
760 | if (this->plt_ == NULL) | |
761 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
762 | |
763 | this->plt_->add_entry(gsym); | |
764 | } | |
765 | ||
c2b45e22 CC |
766 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
767 | ||
768 | void | |
769 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
770 | Layout* layout) | |
771 | { | |
772 | if (this->plt_ == NULL) | |
773 | this->make_plt_section(symtab, layout); | |
774 | ||
775 | if (!this->plt_->has_tlsdesc_entry()) | |
776 | { | |
777 | // Allocate the TLSDESC_GOT entry. | |
778 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
779 | unsigned int got_offset = got->add_constant(0); | |
780 | ||
781 | // Allocate the TLSDESC_PLT entry. | |
782 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
783 | } | |
784 | } | |
785 | ||
31d60480 ILT |
786 | // Create a GOT entry for the TLS module index. |
787 | ||
788 | unsigned int | |
789 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
790 | Sized_relobj<64, false>* object) | |
791 | { | |
792 | if (this->got_mod_index_offset_ == -1U) | |
793 | { | |
794 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
795 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
796 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
797 | unsigned int got_offset = got->add_constant(0); | |
798 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
799 | got_offset, 0); | |
31d60480 ILT |
800 | this->got_mod_index_offset_ = got_offset; |
801 | } | |
802 | return this->got_mod_index_offset_; | |
803 | } | |
804 | ||
2e30d253 ILT |
805 | // Handle a relocation against a non-function symbol defined in a |
806 | // dynamic object. The traditional way to handle this is to generate | |
807 | // a COPY relocation to copy the variable at runtime from the shared | |
808 | // object into the executable's data segment. However, this is | |
809 | // undesirable in general, as if the size of the object changes in the | |
810 | // dynamic object, the executable will no longer work correctly. If | |
811 | // this relocation is in a writable section, then we can create a | |
812 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
813 | // address at runtime. However, we do not want do that if the | |
814 | // relocation is in a read-only section, as it would prevent the | |
815 | // readonly segment from being shared. And if we have to eventually | |
816 | // generate a COPY reloc, then any dynamic relocations will be | |
817 | // useless. So this means that if this is a writable section, we need | |
818 | // to save the relocation until we see whether we have to create a | |
819 | // COPY relocation for this symbol for any other relocation. | |
820 | ||
821 | void | |
822 | Target_x86_64::copy_reloc(const General_options* options, | |
d61c17ea ILT |
823 | Symbol_table* symtab, |
824 | Layout* layout, | |
825 | Sized_relobj<64, false>* object, | |
4f4c5f80 ILT |
826 | unsigned int data_shndx, |
827 | Output_section* output_section, | |
828 | Symbol* gsym, | |
72ec2876 | 829 | const elfcpp::Rela<64, false>& rela) |
2e30d253 | 830 | { |
7d1a9ebb | 831 | Sized_symbol<64>* ssym = symtab->get_sized_symbol<64>(gsym); |
2e30d253 ILT |
832 | |
833 | if (!Copy_relocs<64, false>::need_copy_reloc(options, object, | |
834 | data_shndx, ssym)) | |
835 | { | |
836 | // So far we do not need a COPY reloc. Save this relocation. | |
837 | // If it turns out that we never need a COPY reloc for this | |
838 | // symbol, then we will emit the relocation. | |
839 | if (this->copy_relocs_ == NULL) | |
840 | this->copy_relocs_ = new Copy_relocs<64, false>(); | |
4f4c5f80 | 841 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rela); |
2e30d253 ILT |
842 | } |
843 | else | |
844 | { | |
845 | // Allocate space for this symbol in the .bss section. | |
846 | ||
847 | elfcpp::Elf_types<64>::Elf_WXword symsize = ssym->symsize(); | |
848 | ||
849 | // There is no defined way to determine the required alignment | |
850 | // of the symbol. We pick the alignment based on the size. We | |
851 | // set an arbitrary maximum of 256. | |
852 | unsigned int align; | |
853 | for (align = 1; align < 512; align <<= 1) | |
854 | if ((symsize & align) != 0) | |
855 | break; | |
856 | ||
857 | if (this->dynbss_ == NULL) | |
858 | { | |
859 | this->dynbss_ = new Output_data_space(align); | |
860 | layout->add_output_section_data(".bss", | |
861 | elfcpp::SHT_NOBITS, | |
862 | (elfcpp::SHF_ALLOC | |
863 | | elfcpp::SHF_WRITE), | |
864 | this->dynbss_); | |
865 | } | |
866 | ||
867 | Output_data_space* dynbss = this->dynbss_; | |
868 | ||
869 | if (align > dynbss->addralign()) | |
870 | dynbss->set_space_alignment(align); | |
871 | ||
fe8718a4 | 872 | section_size_type dynbss_size = dynbss->current_data_size(); |
2e30d253 | 873 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 874 | section_size_type offset = dynbss_size; |
27bc2bce | 875 | dynbss->set_current_data_size(dynbss_size + symsize); |
2e30d253 | 876 | |
9b07f471 | 877 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
2e30d253 ILT |
878 | |
879 | // Add the COPY reloc. | |
0ffd9845 ILT |
880 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
881 | rela_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0); | |
2e30d253 ILT |
882 | } |
883 | } | |
884 | ||
885 | ||
886 | // Optimize the TLS relocation type based on what we know about the | |
887 | // symbol. IS_FINAL is true if the final address of this symbol is | |
888 | // known at link time. | |
889 | ||
e041f13d | 890 | tls::Tls_optimization |
2e30d253 ILT |
891 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
892 | { | |
2e30d253 ILT |
893 | // If we are generating a shared library, then we can't do anything |
894 | // in the linker. | |
8851ecca | 895 | if (parameters->options().shared()) |
e041f13d | 896 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
897 | |
898 | switch (r_type) | |
899 | { | |
900 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
901 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
902 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
903 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
904 | // access. Since we know that we are generating an executable, |
905 | // we can convert this to Initial-Exec. If we also know that | |
906 | // this is a local symbol, we can further switch to Local-Exec. | |
907 | if (is_final) | |
e041f13d ILT |
908 | return tls::TLSOPT_TO_LE; |
909 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 910 | |
d61c17ea | 911 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
912 | // This is Local-Dynamic, which refers to a local symbol in the |
913 | // dynamic TLS block. Since we know that we generating an | |
914 | // executable, we can switch to Local-Exec. | |
e041f13d | 915 | return tls::TLSOPT_TO_LE; |
2e30d253 | 916 | |
0ffd9845 | 917 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
918 | case elfcpp::R_X86_64_DTPOFF64: |
919 | // Another Local-Dynamic reloc. | |
e041f13d | 920 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 921 | |
d61c17ea | 922 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
923 | // These are Initial-Exec relocs which get the thread offset |
924 | // from the GOT. If we know that we are linking against the | |
925 | // local symbol, we can switch to Local-Exec, which links the | |
926 | // thread offset into the instruction. | |
927 | if (is_final) | |
e041f13d ILT |
928 | return tls::TLSOPT_TO_LE; |
929 | return tls::TLSOPT_NONE; | |
2e30d253 | 930 | |
d61c17ea | 931 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
932 | // When we already have Local-Exec, there is nothing further we |
933 | // can do. | |
e041f13d | 934 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
935 | |
936 | default: | |
937 | gold_unreachable(); | |
938 | } | |
2e30d253 ILT |
939 | } |
940 | ||
e041f13d ILT |
941 | // Report an unsupported relocation against a local symbol. |
942 | ||
943 | void | |
944 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
945 | unsigned int r_type) | |
946 | { | |
75f2446e ILT |
947 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
948 | object->name().c_str(), r_type); | |
e041f13d ILT |
949 | } |
950 | ||
a036edd8 ILT |
951 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
952 | // dynamic linker does not support it, issue an error. The GNU linker | |
953 | // only issues a non-PIC error for an allocated read-only section. | |
954 | // Here we know the section is allocated, but we don't know that it is | |
955 | // read-only. But we check for all the relocation types which the | |
956 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
957 | // error even if the section is not read-only. | |
958 | ||
959 | void | |
960 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
961 | { | |
962 | switch (r_type) | |
963 | { | |
964 | // These are the relocation types supported by glibc for x86_64. | |
965 | case elfcpp::R_X86_64_RELATIVE: | |
966 | case elfcpp::R_X86_64_GLOB_DAT: | |
967 | case elfcpp::R_X86_64_JUMP_SLOT: | |
968 | case elfcpp::R_X86_64_DTPMOD64: | |
969 | case elfcpp::R_X86_64_DTPOFF64: | |
970 | case elfcpp::R_X86_64_TPOFF64: | |
971 | case elfcpp::R_X86_64_64: | |
972 | case elfcpp::R_X86_64_32: | |
973 | case elfcpp::R_X86_64_PC32: | |
974 | case elfcpp::R_X86_64_COPY: | |
975 | return; | |
976 | ||
977 | default: | |
978 | // This prevents us from issuing more than one error per reloc | |
979 | // section. But we can still wind up issuing more than one | |
980 | // error per object file. | |
981 | if (this->issued_non_pic_error_) | |
982 | return; | |
983 | object->error(_("requires unsupported dynamic reloc; " | |
984 | "recompile with -fPIC")); | |
985 | this->issued_non_pic_error_ = true; | |
986 | return; | |
987 | ||
988 | case elfcpp::R_X86_64_NONE: | |
989 | gold_unreachable(); | |
990 | } | |
991 | } | |
992 | ||
2e30d253 ILT |
993 | // Scan a relocation for a local symbol. |
994 | ||
995 | inline void | |
996 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
997 | Symbol_table* symtab, |
998 | Layout* layout, | |
999 | Target_x86_64* target, | |
1000 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1001 | unsigned int data_shndx, |
4f4c5f80 | 1002 | Output_section* output_section, |
0ffd9845 | 1003 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1004 | unsigned int r_type, |
7bf1f802 | 1005 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1006 | { |
1007 | switch (r_type) | |
1008 | { | |
1009 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1010 | case elfcpp::R_386_GNU_VTINHERIT: |
1011 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1012 | break; |
1013 | ||
1014 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1015 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1016 | // executable), we need to create a dynamic relocation for this |
1017 | // location. The relocation applied at link time will apply the | |
1018 | // link-time value, so we flag the location with an | |
1019 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1020 | // relocate it easily. |
8851ecca | 1021 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1022 | { |
e8c846c3 | 1023 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1024 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1025 | rela_dyn->add_local_relative(object, r_sym, |
1026 | elfcpp::R_X86_64_RELATIVE, | |
1027 | output_section, data_shndx, | |
1028 | reloc.get_r_offset(), | |
1029 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1030 | } |
1031 | break; | |
1032 | ||
2e30d253 ILT |
1033 | case elfcpp::R_X86_64_32: |
1034 | case elfcpp::R_X86_64_32S: | |
1035 | case elfcpp::R_X86_64_16: | |
1036 | case elfcpp::R_X86_64_8: | |
96f2030e | 1037 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1038 | // executable), we need to create a dynamic relocation for this |
1039 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1040 | // because that is always a 64-bit relocation. | |
8851ecca | 1041 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1042 | { |
a036edd8 ILT |
1043 | this->check_non_pic(object, r_type); |
1044 | ||
96f2030e | 1045 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
dceae3c1 ILT |
1046 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
1047 | { | |
1048 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
1049 | rela_dyn->add_local(object, r_sym, r_type, output_section, | |
1050 | data_shndx, reloc.get_r_offset(), | |
1051 | reloc.get_r_addend()); | |
1052 | } | |
1053 | else | |
1054 | { | |
1055 | gold_assert(lsym.get_st_value() == 0); | |
1056 | rela_dyn->add_local_section(object, lsym.get_st_shndx(), | |
1057 | r_type, output_section, | |
1058 | data_shndx, reloc.get_r_offset(), | |
1059 | reloc.get_r_addend()); | |
1060 | } | |
96f2030e | 1061 | } |
2e30d253 ILT |
1062 | break; |
1063 | ||
1064 | case elfcpp::R_X86_64_PC64: | |
1065 | case elfcpp::R_X86_64_PC32: | |
1066 | case elfcpp::R_X86_64_PC16: | |
1067 | case elfcpp::R_X86_64_PC8: | |
1068 | break; | |
1069 | ||
f389a824 ILT |
1070 | case elfcpp::R_X86_64_PLT32: |
1071 | // Since we know this is a local symbol, we can handle this as a | |
1072 | // PC32 reloc. | |
1073 | break; | |
1074 | ||
fdc2f80f | 1075 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1076 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1077 | case elfcpp::R_X86_64_GOTPC64: |
1078 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1079 | // We need a GOT section. |
1080 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1081 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1082 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1083 | break; |
1084 | ||
0ffd9845 ILT |
1085 | case elfcpp::R_X86_64_GOT64: |
1086 | case elfcpp::R_X86_64_GOT32: | |
1087 | case elfcpp::R_X86_64_GOTPCREL64: | |
1088 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1089 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1090 | { |
1091 | // The symbol requires a GOT entry. | |
1092 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1093 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1094 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1095 | { |
1096 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1097 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1098 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1099 | { |
1100 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1101 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1102 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1103 | rela_dyn->add_local_relative( |
1104 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1105 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1106 | else |
dceae3c1 | 1107 | { |
a036edd8 ILT |
1108 | this->check_non_pic(object, r_type); |
1109 | ||
dceae3c1 | 1110 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1111 | rela_dyn->add_local( |
1112 | object, r_sym, r_type, got, | |
1113 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1114 | } |
0ffd9845 ILT |
1115 | } |
1116 | } | |
ee9e9e86 ILT |
1117 | // For GOTPLT64, we'd normally want a PLT section, but since |
1118 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1119 | } |
1120 | break; | |
1121 | ||
2e30d253 ILT |
1122 | case elfcpp::R_X86_64_COPY: |
1123 | case elfcpp::R_X86_64_GLOB_DAT: | |
1124 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1125 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1126 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1127 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1128 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1129 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1130 | gold_error(_("%s: unexpected reloc %u in object file"), |
1131 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1132 | break; |
1133 | ||
d61c17ea | 1134 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1135 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1136 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1137 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1138 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1139 | case elfcpp::R_X86_64_DTPOFF32: |
1140 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1141 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1142 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1143 | { |
8851ecca | 1144 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1145 | const tls::Tls_optimization optimized_type |
1146 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1147 | switch (r_type) |
1148 | { | |
56622147 | 1149 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1150 | if (optimized_type == tls::TLSOPT_NONE) |
1151 | { | |
1152 | // Create a pair of GOT entries for the module index and | |
1153 | // dtv-relative offset. | |
1154 | Output_data_got<64, false>* got | |
1155 | = target->got_section(symtab, layout); | |
1156 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 CC |
1157 | got->add_local_pair_with_rela(object, r_sym, |
1158 | lsym.get_st_shndx(), | |
1159 | GOT_TYPE_TLS_PAIR, | |
1160 | target->rela_dyn_section(layout), | |
1161 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1162 | } |
1163 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1164 | unsupported_reloc_local(object, r_type); | |
1165 | break; | |
1166 | ||
56622147 | 1167 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
c2b45e22 CC |
1168 | if (optimized_type == tls::TLSOPT_NONE) |
1169 | { | |
1170 | // Create reserved PLT and GOT entries for the resolver. | |
1171 | target->reserve_tlsdesc_entries(symtab, layout); | |
1172 | ||
1173 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1174 | Output_data_got<64, false>* got | |
1175 | = target->got_section(symtab, layout); | |
1176 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
1177 | got->add_local_pair_with_rela(object, r_sym, | |
1178 | lsym.get_st_shndx(), | |
1179 | GOT_TYPE_TLS_DESC, | |
1180 | target->rela_dyn_section(layout), | |
1181 | elfcpp::R_X86_64_TLSDESC, 0); | |
1182 | } | |
1183 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1184 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1185 | break; |
1186 | ||
c2b45e22 CC |
1187 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1188 | break; | |
1189 | ||
e041f13d | 1190 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1191 | if (optimized_type == tls::TLSOPT_NONE) |
1192 | { | |
1193 | // Create a GOT entry for the module index. | |
31d60480 | 1194 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1195 | } |
1196 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1197 | unsupported_reloc_local(object, r_type); | |
1198 | break; | |
1199 | ||
0ffd9845 ILT |
1200 | case elfcpp::R_X86_64_DTPOFF32: |
1201 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1202 | break; |
1203 | ||
56622147 | 1204 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1205 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1206 | if (optimized_type == tls::TLSOPT_NONE) |
1207 | { | |
1208 | // Create a GOT entry for the tp-relative offset. | |
1209 | Output_data_got<64, false>* got | |
1210 | = target->got_section(symtab, layout); | |
1211 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1212 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1213 | target->rela_dyn_section(layout), |
1214 | elfcpp::R_X86_64_TPOFF64); | |
1215 | } | |
1216 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1217 | unsupported_reloc_local(object, r_type); |
1218 | break; | |
0ffd9845 | 1219 | |
56622147 | 1220 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1221 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1222 | if (output_is_shared) |
1223 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1224 | break; |
e041f13d ILT |
1225 | |
1226 | default: | |
1227 | gold_unreachable(); | |
2e30d253 ILT |
1228 | } |
1229 | } | |
1230 | break; | |
2e30d253 | 1231 | |
fdc2f80f ILT |
1232 | case elfcpp::R_X86_64_SIZE32: |
1233 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1234 | default: |
75f2446e ILT |
1235 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1236 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1237 | break; |
1238 | } | |
1239 | } | |
1240 | ||
1241 | ||
e041f13d ILT |
1242 | // Report an unsupported relocation against a global symbol. |
1243 | ||
1244 | void | |
1245 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1246 | unsigned int r_type, | |
1247 | Symbol* gsym) | |
1248 | { | |
75f2446e | 1249 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1250 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1251 | } |
1252 | ||
2e30d253 ILT |
1253 | // Scan a relocation for a global symbol. |
1254 | ||
1255 | inline void | |
1256 | Target_x86_64::Scan::global(const General_options& options, | |
d61c17ea ILT |
1257 | Symbol_table* symtab, |
1258 | Layout* layout, | |
1259 | Target_x86_64* target, | |
1260 | Sized_relobj<64, false>* object, | |
1261 | unsigned int data_shndx, | |
4f4c5f80 | 1262 | Output_section* output_section, |
d61c17ea ILT |
1263 | const elfcpp::Rela<64, false>& reloc, |
1264 | unsigned int r_type, | |
1265 | Symbol* gsym) | |
2e30d253 ILT |
1266 | { |
1267 | switch (r_type) | |
1268 | { | |
1269 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1270 | case elfcpp::R_386_GNU_VTINHERIT: |
1271 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1272 | break; |
1273 | ||
1274 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1275 | case elfcpp::R_X86_64_32: |
1276 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1277 | case elfcpp::R_X86_64_16: |
2e30d253 | 1278 | case elfcpp::R_X86_64_8: |
96f2030e | 1279 | { |
d61c6bd4 ILT |
1280 | // Make a PLT entry if necessary. |
1281 | if (gsym->needs_plt_entry()) | |
1282 | { | |
1283 | target->make_plt_entry(symtab, layout, gsym); | |
1284 | // Since this is not a PC-relative relocation, we may be | |
1285 | // taking the address of a function. In that case we need to | |
1286 | // set the entry in the dynamic symbol table to the address of | |
1287 | // the PLT entry. | |
8851ecca | 1288 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1289 | gsym->set_needs_dynsym_value(); |
1290 | } | |
1291 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1292 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1293 | { |
1294 | if (target->may_need_copy_reloc(gsym)) | |
1295 | { | |
7bf1f802 ILT |
1296 | target->copy_reloc(&options, symtab, layout, object, |
1297 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 ILT |
1298 | } |
1299 | else if (r_type == elfcpp::R_X86_64_64 | |
1300 | && gsym->can_use_relative_reloc(false)) | |
1301 | { | |
1302 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1303 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1304 | output_section, object, | |
1305 | data_shndx, reloc.get_r_offset(), | |
1306 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1307 | } |
1308 | else | |
1309 | { | |
a036edd8 | 1310 | this->check_non_pic(object, r_type); |
96f2030e | 1311 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1312 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1313 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1314 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1315 | } |
1316 | } | |
1317 | } | |
1318 | break; | |
1319 | ||
1320 | case elfcpp::R_X86_64_PC64: | |
1321 | case elfcpp::R_X86_64_PC32: | |
1322 | case elfcpp::R_X86_64_PC16: | |
1323 | case elfcpp::R_X86_64_PC8: | |
1324 | { | |
1325 | // Make a PLT entry if necessary. | |
1326 | if (gsym->needs_plt_entry()) | |
1327 | target->make_plt_entry(symtab, layout, gsym); | |
1328 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1329 | int flags = Symbol::NON_PIC_REF; |
1330 | if (gsym->type() == elfcpp::STT_FUNC) | |
1331 | flags |= Symbol::FUNCTION_CALL; | |
1332 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1333 | { |
d61c6bd4 ILT |
1334 | if (target->may_need_copy_reloc(gsym)) |
1335 | { | |
7bf1f802 ILT |
1336 | target->copy_reloc(&options, symtab, layout, object, |
1337 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 | 1338 | } |
86849f1f | 1339 | else |
d61c6bd4 | 1340 | { |
a036edd8 | 1341 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1342 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1343 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1344 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1345 | reloc.get_r_addend()); |
1346 | } | |
86849f1f | 1347 | } |
d61c6bd4 | 1348 | } |
2e30d253 ILT |
1349 | break; |
1350 | ||
ff006520 | 1351 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1352 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1353 | case elfcpp::R_X86_64_GOTPCREL64: |
1354 | case elfcpp::R_X86_64_GOTPCREL: | |
1355 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1356 | { |
1357 | // The symbol requires a GOT entry. | |
1358 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1359 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1360 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1361 | else |
1362 | { | |
2e30d253 ILT |
1363 | // If this symbol is not fully resolved, we need to add a |
1364 | // dynamic relocation for it. | |
7bf1f802 | 1365 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1366 | if (gsym->is_from_dynobj() |
1367 | || gsym->is_undefined() | |
1368 | || gsym->is_preemptible()) | |
0a65a3a7 | 1369 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1370 | elfcpp::R_X86_64_GLOB_DAT); |
1371 | else | |
2e30d253 | 1372 | { |
0a65a3a7 CC |
1373 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1374 | rela_dyn->add_global_relative( | |
1375 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1376 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1377 | } |
1378 | } | |
ee9e9e86 ILT |
1379 | // For GOTPLT64, we also need a PLT entry (but only if the |
1380 | // symbol is not fully resolved). | |
1381 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1382 | && !gsym->final_value_is_known()) | |
1383 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1384 | } |
1385 | break; | |
1386 | ||
1387 | case elfcpp::R_X86_64_PLT32: | |
1388 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1389 | // Otherwise we need a PLT entry. | |
1390 | if (gsym->final_value_is_known()) | |
1391 | break; | |
96f2030e ILT |
1392 | // If building a shared library, we can also skip the PLT entry |
1393 | // if the symbol is defined in the output file and is protected | |
1394 | // or hidden. | |
1395 | if (gsym->is_defined() | |
1396 | && !gsym->is_from_dynobj() | |
1397 | && !gsym->is_preemptible()) | |
1398 | break; | |
2e30d253 ILT |
1399 | target->make_plt_entry(symtab, layout, gsym); |
1400 | break; | |
1401 | ||
fdc2f80f | 1402 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1403 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1404 | case elfcpp::R_X86_64_GOTPC64: |
1405 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1406 | // We need a GOT section. |
1407 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1408 | // For PLTOFF64, we also need a PLT entry (but only if the |
1409 | // symbol is not fully resolved). | |
1410 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1411 | && !gsym->final_value_is_known()) | |
1412 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1413 | break; |
1414 | ||
2e30d253 ILT |
1415 | case elfcpp::R_X86_64_COPY: |
1416 | case elfcpp::R_X86_64_GLOB_DAT: | |
1417 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1418 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1419 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1420 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1421 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1422 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1423 | gold_error(_("%s: unexpected reloc %u in object file"), |
1424 | object->name().c_str(), r_type); | |
2e30d253 | 1425 | break; |
2e30d253 | 1426 | |
d61c17ea | 1427 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1428 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1429 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1430 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1431 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1432 | case elfcpp::R_X86_64_DTPOFF32: |
1433 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1434 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1435 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1436 | { |
1437 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1438 | const tls::Tls_optimization optimized_type |
1439 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1440 | switch (r_type) |
1441 | { | |
56622147 | 1442 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1443 | if (optimized_type == tls::TLSOPT_NONE) |
1444 | { | |
1445 | // Create a pair of GOT entries for the module index and | |
1446 | // dtv-relative offset. | |
1447 | Output_data_got<64, false>* got | |
1448 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1449 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1450 | target->rela_dyn_section(layout), | |
1451 | elfcpp::R_X86_64_DTPMOD64, | |
1452 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1453 | } |
1454 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1455 | { | |
1456 | // Create a GOT entry for the tp-relative offset. | |
1457 | Output_data_got<64, false>* got | |
1458 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1459 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1460 | target->rela_dyn_section(layout), |
1461 | elfcpp::R_X86_64_TPOFF64); | |
1462 | } | |
1463 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1464 | unsupported_reloc_global(object, r_type, gsym); | |
1465 | break; | |
1466 | ||
56622147 | 1467 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
c2b45e22 CC |
1468 | if (optimized_type == tls::TLSOPT_NONE) |
1469 | { | |
1470 | // Create reserved PLT and GOT entries for the resolver. | |
1471 | target->reserve_tlsdesc_entries(symtab, layout); | |
1472 | ||
1473 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1474 | Output_data_got<64, false>* got | |
1475 | = target->got_section(symtab, layout); | |
1476 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1477 | target->rela_dyn_section(layout), | |
1478 | elfcpp::R_X86_64_TLSDESC, 0); | |
1479 | } | |
1480 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1481 | { | |
1482 | // Create a GOT entry for the tp-relative offset. | |
1483 | Output_data_got<64, false>* got | |
1484 | = target->got_section(symtab, layout); | |
1485 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1486 | target->rela_dyn_section(layout), | |
1487 | elfcpp::R_X86_64_TPOFF64); | |
1488 | } | |
1489 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1490 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1491 | break; |
1492 | ||
c2b45e22 CC |
1493 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1494 | break; | |
1495 | ||
e041f13d | 1496 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1497 | if (optimized_type == tls::TLSOPT_NONE) |
1498 | { | |
1499 | // Create a GOT entry for the module index. | |
31d60480 | 1500 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1501 | } |
1502 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1503 | unsupported_reloc_global(object, r_type, gsym); | |
1504 | break; | |
1505 | ||
0ffd9845 ILT |
1506 | case elfcpp::R_X86_64_DTPOFF32: |
1507 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1508 | break; |
1509 | ||
56622147 | 1510 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1511 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1512 | if (optimized_type == tls::TLSOPT_NONE) |
1513 | { | |
1514 | // Create a GOT entry for the tp-relative offset. | |
1515 | Output_data_got<64, false>* got | |
1516 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1517 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1518 | target->rela_dyn_section(layout), |
1519 | elfcpp::R_X86_64_TPOFF64); | |
1520 | } | |
1521 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1522 | unsupported_reloc_global(object, r_type, gsym); |
1523 | break; | |
0ffd9845 | 1524 | |
56622147 | 1525 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1526 | layout->set_has_static_tls(); |
8851ecca | 1527 | if (parameters->options().shared()) |
7bf1f802 | 1528 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1529 | break; |
e041f13d ILT |
1530 | |
1531 | default: | |
1532 | gold_unreachable(); | |
2e30d253 ILT |
1533 | } |
1534 | } | |
1535 | break; | |
fdc2f80f ILT |
1536 | |
1537 | case elfcpp::R_X86_64_SIZE32: | |
1538 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1539 | default: |
75f2446e | 1540 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1541 | object->name().c_str(), r_type, |
1542 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1543 | break; |
1544 | } | |
1545 | } | |
1546 | ||
1547 | // Scan relocations for a section. | |
1548 | ||
1549 | void | |
1550 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1551 | Symbol_table* symtab, |
1552 | Layout* layout, | |
1553 | Sized_relobj<64, false>* object, | |
1554 | unsigned int data_shndx, | |
1555 | unsigned int sh_type, | |
1556 | const unsigned char* prelocs, | |
1557 | size_t reloc_count, | |
730cdc88 ILT |
1558 | Output_section* output_section, |
1559 | bool needs_special_offset_handling, | |
d61c17ea | 1560 | size_t local_symbol_count, |
730cdc88 | 1561 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1562 | { |
1563 | if (sh_type == elfcpp::SHT_REL) | |
1564 | { | |
75f2446e ILT |
1565 | gold_error(_("%s: unsupported REL reloc section"), |
1566 | object->name().c_str()); | |
1567 | return; | |
2e30d253 ILT |
1568 | } |
1569 | ||
1570 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1571 | Target_x86_64::Scan>( | |
1572 | options, | |
1573 | symtab, | |
1574 | layout, | |
1575 | this, | |
1576 | object, | |
1577 | data_shndx, | |
1578 | prelocs, | |
1579 | reloc_count, | |
730cdc88 ILT |
1580 | output_section, |
1581 | needs_special_offset_handling, | |
2e30d253 | 1582 | local_symbol_count, |
730cdc88 | 1583 | plocal_symbols); |
2e30d253 ILT |
1584 | } |
1585 | ||
1586 | // Finalize the sections. | |
1587 | ||
1588 | void | |
1589 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1590 | { | |
1591 | // Fill in some more dynamic tags. | |
1592 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1593 | if (odyn != NULL) | |
1594 | { | |
1595 | if (this->got_plt_ != NULL) | |
1596 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1597 | ||
1598 | if (this->plt_ != NULL) | |
1599 | { | |
1600 | const Output_data* od = this->plt_->rel_plt(); | |
1601 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1602 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1603 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1604 | if (this->plt_->has_tlsdesc_entry()) |
1605 | { | |
1606 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1607 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1608 | this->got_->finalize_data_size(); | |
1609 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1610 | this->plt_, plt_offset); | |
1611 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1612 | this->got_, got_offset); | |
1613 | } | |
2e30d253 ILT |
1614 | } |
1615 | ||
0ffd9845 | 1616 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1617 | { |
0ffd9845 | 1618 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1619 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1620 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1621 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1622 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1623 | } |
1624 | ||
8851ecca | 1625 | if (!parameters->options().shared()) |
2e30d253 ILT |
1626 | { |
1627 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1628 | // linker at run time, and used by the debugger. | |
1629 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1630 | } | |
1631 | } | |
1632 | ||
1633 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1634 | // relocs. | |
1635 | if (this->copy_relocs_ == NULL) | |
1636 | return; | |
1637 | if (this->copy_relocs_->any_to_emit()) | |
1638 | { | |
0ffd9845 ILT |
1639 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
1640 | this->copy_relocs_->emit(rela_dyn); | |
2e30d253 ILT |
1641 | } |
1642 | delete this->copy_relocs_; | |
1643 | this->copy_relocs_ = NULL; | |
1644 | } | |
1645 | ||
1646 | // Perform a relocation. | |
1647 | ||
1648 | inline bool | |
1649 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1650 | Target_x86_64* target, | |
1651 | size_t relnum, | |
0ffd9845 | 1652 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1653 | unsigned int r_type, |
1654 | const Sized_symbol<64>* gsym, | |
1655 | const Symbol_value<64>* psymval, | |
1656 | unsigned char* view, | |
1657 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1658 | section_size_type view_size) |
2e30d253 ILT |
1659 | { |
1660 | if (this->skip_call_tls_get_addr_) | |
1661 | { | |
1662 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1663 | || gsym == NULL | |
0ffd9845 | 1664 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1665 | { |
75f2446e ILT |
1666 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1667 | _("missing expected TLS relocation")); | |
1668 | } | |
1669 | else | |
1670 | { | |
1671 | this->skip_call_tls_get_addr_ = false; | |
1672 | return false; | |
2e30d253 | 1673 | } |
2e30d253 ILT |
1674 | } |
1675 | ||
1676 | // Pick the value to use for symbols defined in shared objects. | |
1677 | Symbol_value<64> symval; | |
96f2030e ILT |
1678 | if (gsym != NULL |
1679 | && (gsym->is_from_dynobj() | |
8851ecca | 1680 | || (parameters->options().shared() |
8fc19601 | 1681 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
96f2030e | 1682 | && gsym->has_plt_offset()) |
2e30d253 ILT |
1683 | { |
1684 | symval.set_output_value(target->plt_section()->address() | |
1685 | + gsym->plt_offset()); | |
1686 | psymval = &symval; | |
1687 | } | |
1688 | ||
1689 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1690 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1691 | ||
1692 | // Get the GOT offset if needed. | |
96f2030e ILT |
1693 | // The GOT pointer points to the end of the GOT section. |
1694 | // We need to subtract the size of the GOT section to get | |
1695 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1696 | bool have_got_offset = false; |
1697 | unsigned int got_offset = 0; | |
1698 | switch (r_type) | |
1699 | { | |
1700 | case elfcpp::R_X86_64_GOT32: | |
1701 | case elfcpp::R_X86_64_GOT64: | |
1702 | case elfcpp::R_X86_64_GOTPLT64: | |
1703 | case elfcpp::R_X86_64_GOTPCREL: | |
1704 | case elfcpp::R_X86_64_GOTPCREL64: | |
1705 | if (gsym != NULL) | |
1706 | { | |
0a65a3a7 CC |
1707 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1708 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1709 | } |
1710 | else | |
1711 | { | |
1712 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1713 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1714 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1715 | - target->got_size()); | |
0ffd9845 ILT |
1716 | } |
1717 | have_got_offset = true; | |
1718 | break; | |
1719 | ||
1720 | default: | |
1721 | break; | |
1722 | } | |
2e30d253 ILT |
1723 | |
1724 | switch (r_type) | |
1725 | { | |
1726 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1727 | case elfcpp::R_386_GNU_VTINHERIT: |
1728 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1729 | break; |
1730 | ||
1731 | case elfcpp::R_X86_64_64: | |
1732 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1733 | break; | |
1734 | ||
1735 | case elfcpp::R_X86_64_PC64: | |
1736 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1737 | address); | |
1738 | break; | |
1739 | ||
1740 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1741 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1742 | // uint64_t x = value + addend; | |
1743 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1744 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1745 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1746 | break; | |
1747 | ||
1748 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1749 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1750 | // int64_t x = value + addend; // note this quantity is signed! | |
1751 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1752 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1753 | break; | |
1754 | ||
1755 | case elfcpp::R_X86_64_PC32: | |
1756 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1757 | address); | |
1758 | break; | |
1759 | ||
1760 | case elfcpp::R_X86_64_16: | |
1761 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1762 | break; | |
1763 | ||
1764 | case elfcpp::R_X86_64_PC16: | |
1765 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1766 | address); | |
1767 | break; | |
1768 | ||
1769 | case elfcpp::R_X86_64_8: | |
1770 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1771 | break; | |
1772 | ||
1773 | case elfcpp::R_X86_64_PC8: | |
1774 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1775 | address); | |
1776 | break; | |
1777 | ||
1778 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1779 | gold_assert(gsym == NULL |
1780 | || gsym->has_plt_offset() | |
99f8faca ILT |
1781 | || gsym->final_value_is_known() |
1782 | || (gsym->is_defined() | |
1783 | && !gsym->is_from_dynobj() | |
1784 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1785 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1786 | // behaves differently because psymval was set to point to | |
1787 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1788 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1789 | address); | |
1790 | break; | |
1791 | ||
ee9e9e86 ILT |
1792 | case elfcpp::R_X86_64_PLTOFF64: |
1793 | { | |
1794 | gold_assert(gsym); | |
1795 | gold_assert(gsym->has_plt_offset() | |
1796 | || gsym->final_value_is_known()); | |
1797 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1798 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1799 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1800 | addend - got_address); | |
ee9e9e86 ILT |
1801 | } |
1802 | ||
2e30d253 | 1803 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1804 | gold_assert(have_got_offset); |
1805 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1806 | break; |
1807 | ||
e822f2b1 ILT |
1808 | case elfcpp::R_X86_64_GOTPC32: |
1809 | { | |
1810 | gold_assert(gsym); | |
1811 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1812 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1813 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1814 | } | |
1815 | break; | |
1816 | ||
1817 | case elfcpp::R_X86_64_GOT64: | |
1818 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1819 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1820 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1821 | gold_assert(have_got_offset); |
1822 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1823 | break; |
1824 | ||
1825 | case elfcpp::R_X86_64_GOTPC64: | |
1826 | { | |
1827 | gold_assert(gsym); | |
1828 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1829 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1830 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1831 | } | |
1832 | break; | |
1833 | ||
2e30d253 ILT |
1834 | case elfcpp::R_X86_64_GOTOFF64: |
1835 | { | |
1836 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1837 | value = (psymval->value(object, 0) | |
96f2030e | 1838 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1839 | Relocate_functions<64, false>::rela64(view, value, addend); |
1840 | } | |
1841 | break; | |
1842 | ||
1843 | case elfcpp::R_X86_64_GOTPCREL: | |
1844 | { | |
0ffd9845 ILT |
1845 | gold_assert(have_got_offset); |
1846 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1847 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1848 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1849 | } |
1850 | break; | |
1851 | ||
e822f2b1 ILT |
1852 | case elfcpp::R_X86_64_GOTPCREL64: |
1853 | { | |
0ffd9845 ILT |
1854 | gold_assert(have_got_offset); |
1855 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1856 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1857 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1858 | } |
1859 | break; | |
1860 | ||
2e30d253 ILT |
1861 | case elfcpp::R_X86_64_COPY: |
1862 | case elfcpp::R_X86_64_GLOB_DAT: | |
1863 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1864 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1865 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1866 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1867 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1868 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1869 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1870 | _("unexpected reloc %u in object file"), | |
1871 | r_type); | |
2e30d253 ILT |
1872 | break; |
1873 | ||
d61c17ea | 1874 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1875 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1876 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1877 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1878 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1879 | case elfcpp::R_X86_64_DTPOFF32: |
1880 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1881 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1882 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1883 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1884 | view, address, view_size); | |
2e30d253 | 1885 | break; |
2e30d253 | 1886 | |
fdc2f80f ILT |
1887 | case elfcpp::R_X86_64_SIZE32: |
1888 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1889 | default: |
75f2446e ILT |
1890 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1891 | _("unsupported reloc %u"), | |
1892 | r_type); | |
2e30d253 ILT |
1893 | break; |
1894 | } | |
1895 | ||
1896 | return true; | |
1897 | } | |
1898 | ||
1899 | // Perform a TLS relocation. | |
1900 | ||
1901 | inline void | |
d61c17ea | 1902 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1903 | Target_x86_64* target, |
d61c17ea | 1904 | size_t relnum, |
72ec2876 | 1905 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1906 | unsigned int r_type, |
1907 | const Sized_symbol<64>* gsym, | |
1908 | const Symbol_value<64>* psymval, | |
1909 | unsigned char* view, | |
6a41d30b | 1910 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1911 | section_size_type view_size) |
2e30d253 | 1912 | { |
2e30d253 | 1913 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1914 | |
1915 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1916 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1917 | |
1918 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1919 | ||
1920 | const bool is_final = (gsym == NULL | |
8851ecca | 1921 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1922 | : gsym->final_value_is_known()); |
e041f13d ILT |
1923 | const tls::Tls_optimization optimized_type |
1924 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1925 | switch (r_type) |
1926 | { | |
56622147 | 1927 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
e041f13d | 1928 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1929 | { |
7bf1f802 | 1930 | gold_assert(tls_segment != NULL); |
2e30d253 | 1931 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1932 | rela, r_type, value, view, |
2e30d253 ILT |
1933 | view_size); |
1934 | break; | |
1935 | } | |
7bf1f802 ILT |
1936 | else |
1937 | { | |
c2b45e22 CC |
1938 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1939 | ? GOT_TYPE_TLS_OFFSET | |
1940 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
1941 | unsigned int got_offset; |
1942 | if (gsym != NULL) | |
1943 | { | |
c2b45e22 CC |
1944 | gold_assert(gsym->has_got_offset(got_type)); |
1945 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
1946 | } |
1947 | else | |
1948 | { | |
1949 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
1950 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1951 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
1952 | - target->got_size()); |
1953 | } | |
1954 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1955 | { | |
1956 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 1957 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 1958 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 1959 | value, view, address, view_size); |
7bf1f802 ILT |
1960 | break; |
1961 | } | |
1962 | else if (optimized_type == tls::TLSOPT_NONE) | |
1963 | { | |
1964 | // Relocate the field with the offset of the pair of GOT | |
1965 | // entries. | |
6a41d30b ILT |
1966 | value = target->got_plt_section()->address() + got_offset; |
1967 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1968 | address); | |
7bf1f802 ILT |
1969 | break; |
1970 | } | |
1971 | } | |
72ec2876 | 1972 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1973 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1974 | break; |
1975 | ||
c2b45e22 CC |
1976 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
1977 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1978 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1979 | { | |
1980 | gold_assert(tls_segment != NULL); | |
1981 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1982 | rela, r_type, value, view, | |
1983 | view_size); | |
1984 | break; | |
1985 | } | |
1986 | else | |
1987 | { | |
1988 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1989 | ? GOT_TYPE_TLS_OFFSET | |
1990 | : GOT_TYPE_TLS_DESC); | |
1991 | unsigned int got_offset; | |
1992 | if (gsym != NULL) | |
1993 | { | |
1994 | gold_assert(gsym->has_got_offset(got_type)); | |
1995 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1996 | } | |
1997 | else | |
1998 | { | |
1999 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2000 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2001 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2002 | - target->got_size()); | |
2003 | } | |
2004 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2005 | { | |
2006 | gold_assert(tls_segment != NULL); | |
2007 | value = target->got_plt_section()->address() + got_offset; | |
2008 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2009 | rela, r_type, value, view, address, | |
2010 | view_size); | |
2011 | break; | |
2012 | } | |
2013 | else if (optimized_type == tls::TLSOPT_NONE) | |
2014 | { | |
2015 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2016 | { | |
2017 | // Relocate the field with the offset of the pair of GOT | |
2018 | // entries. | |
2019 | value = target->got_plt_section()->address() + got_offset; | |
2020 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2021 | address); | |
2022 | } | |
2023 | break; | |
2024 | } | |
2025 | } | |
2026 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2027 | _("unsupported reloc %u"), r_type); | |
2028 | break; | |
2029 | ||
56622147 | 2030 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
e041f13d ILT |
2031 | if (optimized_type == tls::TLSOPT_TO_LE) |
2032 | { | |
7bf1f802 | 2033 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2034 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2035 | value, view, view_size); | |
2036 | break; | |
e041f13d | 2037 | } |
7bf1f802 ILT |
2038 | else if (optimized_type == tls::TLSOPT_NONE) |
2039 | { | |
2040 | // Relocate the field with the offset of the GOT entry for | |
2041 | // the module index. | |
2042 | unsigned int got_offset; | |
31d60480 ILT |
2043 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2044 | - target->got_size()); | |
6a41d30b ILT |
2045 | value = target->got_plt_section()->address() + got_offset; |
2046 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2047 | address); | |
7bf1f802 ILT |
2048 | break; |
2049 | } | |
72ec2876 | 2050 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2051 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2052 | break; |
0ffd9845 ILT |
2053 | |
2054 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 2055 | gold_assert(tls_segment != NULL); |
e041f13d | 2056 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
2057 | value -= tls_segment->memsz(); |
2058 | Relocate_functions<64, false>::rela32(view, value, 0); | |
0ffd9845 ILT |
2059 | break; |
2060 | ||
2061 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 2062 | gold_assert(tls_segment != NULL); |
e041f13d | 2063 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
2064 | value -= tls_segment->memsz(); |
2065 | Relocate_functions<64, false>::rela64(view, value, 0); | |
0ffd9845 | 2066 | break; |
2e30d253 | 2067 | |
56622147 ILT |
2068 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2069 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2070 | { | |
7bf1f802 | 2071 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2072 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2073 | rela, r_type, value, view, | |
2074 | view_size); | |
2075 | break; | |
2076 | } | |
7bf1f802 ILT |
2077 | else if (optimized_type == tls::TLSOPT_NONE) |
2078 | { | |
2079 | // Relocate the field with the offset of the GOT entry for | |
2080 | // the tp-relative offset of the symbol. | |
2081 | unsigned int got_offset; | |
2082 | if (gsym != NULL) | |
2083 | { | |
0a65a3a7 CC |
2084 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2085 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2086 | - target->got_size()); | |
7bf1f802 ILT |
2087 | } |
2088 | else | |
2089 | { | |
2090 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2091 | gold_assert(object->local_has_got_offset(r_sym, |
2092 | GOT_TYPE_TLS_OFFSET)); | |
2093 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2094 | - target->got_size()); |
2095 | } | |
6a41d30b ILT |
2096 | value = target->got_plt_section()->address() + got_offset; |
2097 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2098 | break; |
2099 | } | |
56622147 ILT |
2100 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2101 | _("unsupported reloc type %u"), | |
2102 | r_type); | |
2103 | break; | |
0ffd9845 | 2104 | |
56622147 | 2105 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b ILT |
2106 | value -= tls_segment->memsz(); |
2107 | Relocate_functions<64, false>::rela32(view, value, 0); | |
56622147 | 2108 | break; |
2e30d253 | 2109 | } |
2e30d253 ILT |
2110 | } |
2111 | ||
7bf1f802 ILT |
2112 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2113 | // Initial-Exec. | |
2114 | ||
2115 | inline void | |
2116 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2117 | size_t relnum, | |
c2b45e22 | 2118 | Output_segment*, |
7bf1f802 ILT |
2119 | const elfcpp::Rela<64, false>& rela, |
2120 | unsigned int, | |
2121 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2122 | unsigned char* view, | |
c2b45e22 | 2123 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2124 | section_size_type view_size) |
7bf1f802 ILT |
2125 | { |
2126 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2127 | // .word 0x6666; rex64; call __tls_get_addr | |
2128 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2129 | ||
2130 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2131 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2132 | ||
2133 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2134 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2135 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2136 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2137 | ||
2138 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2139 | ||
c2b45e22 CC |
2140 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2141 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2142 | |
2143 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2144 | // We can skip it. | |
2145 | this->skip_call_tls_get_addr_ = true; | |
2146 | } | |
2147 | ||
e041f13d | 2148 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2149 | // Local-Exec. |
2150 | ||
2151 | inline void | |
d61c17ea ILT |
2152 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2153 | size_t relnum, | |
2154 | Output_segment* tls_segment, | |
72ec2876 | 2155 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2156 | unsigned int, |
2157 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2158 | unsigned char* view, | |
fe8718a4 | 2159 | section_size_type view_size) |
2e30d253 | 2160 | { |
0ffd9845 ILT |
2161 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2162 | // .word 0x6666; rex64; call __tls_get_addr | |
2163 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2164 | |
72ec2876 ILT |
2165 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2166 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2167 | |
72ec2876 ILT |
2168 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2169 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2170 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2171 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2172 | |
0ffd9845 | 2173 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2174 | |
6a41d30b | 2175 | value -= tls_segment->memsz(); |
0ffd9845 | 2176 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2177 | |
2178 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2179 | // We can skip it. | |
2180 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2181 | } |
2182 | ||
c2b45e22 CC |
2183 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2184 | ||
2185 | inline void | |
2186 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2187 | const Relocate_info<64, false>* relinfo, | |
2188 | size_t relnum, | |
2189 | Output_segment*, | |
2190 | const elfcpp::Rela<64, false>& rela, | |
2191 | unsigned int r_type, | |
2192 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2193 | unsigned char* view, | |
2194 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2195 | section_size_type view_size) | |
2196 | { | |
2197 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2198 | { | |
2199 | // leaq foo@tlsdesc(%rip), %rax | |
2200 | // ==> movq foo@gottpoff(%rip), %rax | |
2201 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2202 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2203 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2204 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2205 | view[-2] = 0x8b; | |
2206 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2207 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2208 | } | |
2209 | else | |
2210 | { | |
2211 | // call *foo@tlscall(%rax) | |
2212 | // ==> nop; nop | |
2213 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2214 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2215 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2216 | view[0] == 0xff && view[1] == 0x10); | |
2217 | view[0] = 0x66; | |
2218 | view[1] = 0x90; | |
2219 | } | |
2220 | } | |
2221 | ||
2222 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2223 | ||
2224 | inline void | |
2225 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2226 | const Relocate_info<64, false>* relinfo, | |
2227 | size_t relnum, | |
2228 | Output_segment* tls_segment, | |
2229 | const elfcpp::Rela<64, false>& rela, | |
2230 | unsigned int r_type, | |
2231 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2232 | unsigned char* view, | |
2233 | section_size_type view_size) | |
2234 | { | |
2235 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2236 | { | |
2237 | // leaq foo@tlsdesc(%rip), %rax | |
2238 | // ==> movq foo@tpoff, %rax | |
2239 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2240 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2241 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2242 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2243 | view[-2] = 0xc7; | |
2244 | view[-1] = 0xc0; | |
2245 | value -= tls_segment->memsz(); | |
2246 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2247 | } | |
2248 | else | |
2249 | { | |
2250 | // call *foo@tlscall(%rax) | |
2251 | // ==> nop; nop | |
2252 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2253 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2254 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2255 | view[0] == 0xff && view[1] == 0x10); | |
2256 | view[0] = 0x66; | |
2257 | view[1] = 0x90; | |
2258 | } | |
2259 | } | |
2260 | ||
2e30d253 | 2261 | inline void |
72ec2876 ILT |
2262 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2263 | size_t relnum, | |
2264 | Output_segment*, | |
2265 | const elfcpp::Rela<64, false>& rela, | |
2266 | unsigned int, | |
2267 | elfcpp::Elf_types<64>::Elf_Addr, | |
2268 | unsigned char* view, | |
fe8718a4 | 2269 | section_size_type view_size) |
2e30d253 | 2270 | { |
72ec2876 ILT |
2271 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2272 | // ... leq foo@dtpoff(%rax),%reg | |
2273 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2274 | |
72ec2876 ILT |
2275 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2276 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2277 | |
72ec2876 ILT |
2278 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2279 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2280 | ||
2281 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2282 | ||
2283 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2284 | ||
2285 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2286 | // We can skip it. | |
2287 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2288 | } |
2289 | ||
56622147 ILT |
2290 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2291 | // Local-Exec. | |
2292 | ||
2293 | inline void | |
2294 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2295 | size_t relnum, | |
2296 | Output_segment* tls_segment, | |
2297 | const elfcpp::Rela<64, false>& rela, | |
2298 | unsigned int, | |
2299 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2300 | unsigned char* view, | |
fe8718a4 | 2301 | section_size_type view_size) |
56622147 ILT |
2302 | { |
2303 | // We need to examine the opcodes to figure out which instruction we | |
2304 | // are looking at. | |
2305 | ||
2306 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2307 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2308 | ||
2309 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2310 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2311 | ||
2312 | unsigned char op1 = view[-3]; | |
2313 | unsigned char op2 = view[-2]; | |
2314 | unsigned char op3 = view[-1]; | |
2315 | unsigned char reg = op3 >> 3; | |
2316 | ||
2317 | if (op2 == 0x8b) | |
2318 | { | |
2319 | // movq | |
2320 | if (op1 == 0x4c) | |
2321 | view[-3] = 0x49; | |
2322 | view[-2] = 0xc7; | |
2323 | view[-1] = 0xc0 | reg; | |
2324 | } | |
2325 | else if (reg == 4) | |
2326 | { | |
2327 | // Special handling for %rsp. | |
2328 | if (op1 == 0x4c) | |
2329 | view[-3] = 0x49; | |
2330 | view[-2] = 0x81; | |
2331 | view[-1] = 0xc0 | reg; | |
2332 | } | |
2333 | else | |
2334 | { | |
2335 | // addq | |
2336 | if (op1 == 0x4c) | |
2337 | view[-3] = 0x4d; | |
2338 | view[-2] = 0x8d; | |
2339 | view[-1] = 0x80 | reg | (reg << 3); | |
2340 | } | |
2341 | ||
6a41d30b | 2342 | value -= tls_segment->memsz(); |
56622147 ILT |
2343 | Relocate_functions<64, false>::rela32(view, value, 0); |
2344 | } | |
2345 | ||
2e30d253 ILT |
2346 | // Relocate section data. |
2347 | ||
2348 | void | |
2349 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2350 | unsigned int sh_type, |
2351 | const unsigned char* prelocs, | |
2352 | size_t reloc_count, | |
730cdc88 ILT |
2353 | Output_section* output_section, |
2354 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2355 | unsigned char* view, |
2356 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2357 | section_size_type view_size) |
2e30d253 ILT |
2358 | { |
2359 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2360 | ||
2361 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2362 | Target_x86_64::Relocate>( | |
2363 | relinfo, | |
2364 | this, | |
2365 | prelocs, | |
2366 | reloc_count, | |
730cdc88 ILT |
2367 | output_section, |
2368 | needs_special_offset_handling, | |
2e30d253 ILT |
2369 | view, |
2370 | address, | |
2371 | view_size); | |
2372 | } | |
2373 | ||
6a74a719 ILT |
2374 | // Return the size of a relocation while scanning during a relocatable |
2375 | // link. | |
2376 | ||
2377 | unsigned int | |
2378 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2379 | unsigned int r_type, | |
2380 | Relobj* object) | |
2381 | { | |
2382 | switch (r_type) | |
2383 | { | |
2384 | case elfcpp::R_X86_64_NONE: | |
2385 | case elfcpp::R_386_GNU_VTINHERIT: | |
2386 | case elfcpp::R_386_GNU_VTENTRY: | |
2387 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2388 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2389 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2390 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2391 | case elfcpp::R_X86_64_DTPOFF32: | |
2392 | case elfcpp::R_X86_64_DTPOFF64: | |
2393 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2394 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2395 | return 0; | |
2396 | ||
2397 | case elfcpp::R_X86_64_64: | |
2398 | case elfcpp::R_X86_64_PC64: | |
2399 | case elfcpp::R_X86_64_GOTOFF64: | |
2400 | case elfcpp::R_X86_64_GOTPC64: | |
2401 | case elfcpp::R_X86_64_PLTOFF64: | |
2402 | case elfcpp::R_X86_64_GOT64: | |
2403 | case elfcpp::R_X86_64_GOTPCREL64: | |
2404 | case elfcpp::R_X86_64_GOTPCREL: | |
2405 | case elfcpp::R_X86_64_GOTPLT64: | |
2406 | return 8; | |
2407 | ||
2408 | case elfcpp::R_X86_64_32: | |
2409 | case elfcpp::R_X86_64_32S: | |
2410 | case elfcpp::R_X86_64_PC32: | |
2411 | case elfcpp::R_X86_64_PLT32: | |
2412 | case elfcpp::R_X86_64_GOTPC32: | |
2413 | case elfcpp::R_X86_64_GOT32: | |
2414 | return 4; | |
2415 | ||
2416 | case elfcpp::R_X86_64_16: | |
2417 | case elfcpp::R_X86_64_PC16: | |
2418 | return 2; | |
2419 | ||
2420 | case elfcpp::R_X86_64_8: | |
2421 | case elfcpp::R_X86_64_PC8: | |
2422 | return 1; | |
2423 | ||
2424 | case elfcpp::R_X86_64_COPY: | |
2425 | case elfcpp::R_X86_64_GLOB_DAT: | |
2426 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2427 | case elfcpp::R_X86_64_RELATIVE: | |
2428 | // These are outstanding tls relocs, which are unexpected when linking | |
2429 | case elfcpp::R_X86_64_TPOFF64: | |
2430 | case elfcpp::R_X86_64_DTPMOD64: | |
2431 | case elfcpp::R_X86_64_TLSDESC: | |
2432 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2433 | return 0; | |
2434 | ||
2435 | case elfcpp::R_X86_64_SIZE32: | |
2436 | case elfcpp::R_X86_64_SIZE64: | |
2437 | default: | |
2438 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2439 | return 0; | |
2440 | } | |
2441 | } | |
2442 | ||
2443 | // Scan the relocs during a relocatable link. | |
2444 | ||
2445 | void | |
2446 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2447 | Symbol_table* symtab, | |
2448 | Layout* layout, | |
2449 | Sized_relobj<64, false>* object, | |
2450 | unsigned int data_shndx, | |
2451 | unsigned int sh_type, | |
2452 | const unsigned char* prelocs, | |
2453 | size_t reloc_count, | |
2454 | Output_section* output_section, | |
2455 | bool needs_special_offset_handling, | |
2456 | size_t local_symbol_count, | |
2457 | const unsigned char* plocal_symbols, | |
2458 | Relocatable_relocs* rr) | |
2459 | { | |
2460 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2461 | ||
2462 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2463 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2464 | ||
7019cd25 | 2465 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2466 | Scan_relocatable_relocs>( |
2467 | options, | |
2468 | symtab, | |
2469 | layout, | |
2470 | object, | |
2471 | data_shndx, | |
2472 | prelocs, | |
2473 | reloc_count, | |
2474 | output_section, | |
2475 | needs_special_offset_handling, | |
2476 | local_symbol_count, | |
2477 | plocal_symbols, | |
2478 | rr); | |
2479 | } | |
2480 | ||
2481 | // Relocate a section during a relocatable link. | |
2482 | ||
2483 | void | |
2484 | Target_x86_64::relocate_for_relocatable( | |
2485 | const Relocate_info<64, false>* relinfo, | |
2486 | unsigned int sh_type, | |
2487 | const unsigned char* prelocs, | |
2488 | size_t reloc_count, | |
2489 | Output_section* output_section, | |
2490 | off_t offset_in_output_section, | |
2491 | const Relocatable_relocs* rr, | |
2492 | unsigned char* view, | |
2493 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2494 | section_size_type view_size, | |
2495 | unsigned char* reloc_view, | |
2496 | section_size_type reloc_view_size) | |
2497 | { | |
2498 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2499 | ||
7019cd25 | 2500 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2501 | relinfo, |
2502 | prelocs, | |
2503 | reloc_count, | |
2504 | output_section, | |
2505 | offset_in_output_section, | |
2506 | rr, | |
2507 | view, | |
2508 | view_address, | |
2509 | view_size, | |
2510 | reloc_view, | |
2511 | reloc_view_size); | |
2512 | } | |
2513 | ||
4fb6c25d ILT |
2514 | // Return the value to use for a dynamic which requires special |
2515 | // treatment. This is how we support equality comparisons of function | |
2516 | // pointers across shared library boundaries, as described in the | |
2517 | // processor specific ABI supplement. | |
2518 | ||
2519 | uint64_t | |
2520 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2521 | { | |
2522 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2523 | return this->plt_section()->address() + gsym->plt_offset(); | |
2524 | } | |
2525 | ||
2e30d253 ILT |
2526 | // Return a string used to fill a code section with nops to take up |
2527 | // the specified length. | |
2528 | ||
2529 | std::string | |
8851ecca | 2530 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2531 | { |
2532 | if (length >= 16) | |
2533 | { | |
2534 | // Build a jmpq instruction to skip over the bytes. | |
2535 | unsigned char jmp[5]; | |
2536 | jmp[0] = 0xe9; | |
04bf7072 | 2537 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2538 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2539 | + std::string(length - 5, '\0')); | |
2540 | } | |
2541 | ||
2542 | // Nop sequences of various lengths. | |
2543 | const char nop1[1] = { 0x90 }; // nop | |
2544 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2545 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2546 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2547 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2548 | 0x00 }; // leal 0(%esi,1),%esi | |
2549 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2550 | 0x00, 0x00 }; | |
2551 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2552 | 0x00, 0x00, 0x00 }; | |
2553 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2554 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2555 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2556 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2557 | 0x00 }; | |
2558 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2559 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2560 | 0x00, 0x00 }; | |
2561 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2562 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2563 | 0x00, 0x00, 0x00 }; | |
2564 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2565 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2566 | 0x00, 0x00, 0x00, 0x00 }; | |
2567 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2568 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2569 | 0x27, 0x00, 0x00, 0x00, | |
2570 | 0x00 }; | |
2571 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2572 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2573 | 0xbc, 0x27, 0x00, 0x00, | |
2574 | 0x00, 0x00 }; | |
2575 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2576 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2577 | 0x90, 0x90, 0x90, 0x90, | |
2578 | 0x90, 0x90, 0x90 }; | |
2579 | ||
2580 | const char* nops[16] = { | |
2581 | NULL, | |
2582 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2583 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2584 | }; | |
2585 | ||
2586 | return std::string(nops[length], length); | |
2587 | } | |
2588 | ||
2589 | // The selector for x86_64 object files. | |
2590 | ||
2591 | class Target_selector_x86_64 : public Target_selector | |
2592 | { | |
2593 | public: | |
2594 | Target_selector_x86_64() | |
e96caa79 | 2595 | : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64") |
2e30d253 ILT |
2596 | { } |
2597 | ||
2598 | Target* | |
e96caa79 ILT |
2599 | do_instantiate_target() |
2600 | { return new Target_x86_64(); } | |
2e30d253 ILT |
2601 | }; |
2602 | ||
2e30d253 ILT |
2603 | Target_selector_x86_64 target_selector_x86_64; |
2604 | ||
2605 | } // End anonymous namespace. |