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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" | |
12c0daef | 35 | #include "copy-relocs.h" |
2e30d253 ILT |
36 | #include "target.h" |
37 | #include "target-reloc.h" | |
38 | #include "target-select.h" | |
e041f13d | 39 | #include "tls.h" |
2e30d253 ILT |
40 | |
41 | namespace | |
42 | { | |
43 | ||
44 | using namespace gold; | |
45 | ||
46 | class Output_data_plt_x86_64; | |
47 | ||
48 | // The x86_64 target class. | |
d61c17ea ILT |
49 | // See the ABI at |
50 | // http://www.x86-64.org/documentation/abi.pdf | |
51 | // TLS info comes from | |
52 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 53 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 ILT |
54 | |
55 | class Target_x86_64 : public Sized_target<64, false> | |
56 | { | |
57 | public: | |
e822f2b1 ILT |
58 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
59 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
60 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
61 | ||
62 | Target_x86_64() | |
63 | : Sized_target<64, false>(&x86_64_info), | |
0ffd9845 | 64 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
12c0daef | 65 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), |
edfbb029 | 66 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
2e30d253 ILT |
67 | { } |
68 | ||
69 | // Scan the relocations to look for symbol adjustments. | |
70 | void | |
71 | scan_relocs(const General_options& options, | |
72 | Symbol_table* symtab, | |
73 | Layout* layout, | |
74 | Sized_relobj<64, false>* object, | |
75 | unsigned int data_shndx, | |
76 | unsigned int sh_type, | |
77 | const unsigned char* prelocs, | |
78 | size_t reloc_count, | |
730cdc88 ILT |
79 | Output_section* output_section, |
80 | bool needs_special_offset_handling, | |
2e30d253 | 81 | size_t local_symbol_count, |
730cdc88 | 82 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
83 | |
84 | // Finalize the sections. | |
85 | void | |
86 | do_finalize_sections(Layout*); | |
87 | ||
4fb6c25d ILT |
88 | // Return the value to use for a dynamic which requires special |
89 | // treatment. | |
90 | uint64_t | |
91 | do_dynsym_value(const Symbol*) const; | |
92 | ||
2e30d253 ILT |
93 | // Relocate a section. |
94 | void | |
95 | relocate_section(const Relocate_info<64, false>*, | |
96 | unsigned int sh_type, | |
97 | const unsigned char* prelocs, | |
98 | size_t reloc_count, | |
730cdc88 ILT |
99 | Output_section* output_section, |
100 | bool needs_special_offset_handling, | |
2e30d253 ILT |
101 | unsigned char* view, |
102 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
fe8718a4 | 103 | section_size_type view_size); |
2e30d253 | 104 | |
6a74a719 ILT |
105 | // Scan the relocs during a relocatable link. |
106 | void | |
107 | scan_relocatable_relocs(const General_options& options, | |
108 | Symbol_table* symtab, | |
109 | Layout* layout, | |
110 | Sized_relobj<64, false>* object, | |
111 | unsigned int data_shndx, | |
112 | unsigned int sh_type, | |
113 | const unsigned char* prelocs, | |
114 | size_t reloc_count, | |
115 | Output_section* output_section, | |
116 | bool needs_special_offset_handling, | |
117 | size_t local_symbol_count, | |
118 | const unsigned char* plocal_symbols, | |
119 | Relocatable_relocs*); | |
120 | ||
121 | // Relocate a section during a relocatable link. | |
122 | void | |
123 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
124 | unsigned int sh_type, | |
125 | const unsigned char* prelocs, | |
126 | size_t reloc_count, | |
127 | Output_section* output_section, | |
128 | off_t offset_in_output_section, | |
129 | const Relocatable_relocs*, | |
130 | unsigned char* view, | |
131 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
132 | section_size_type view_size, | |
133 | unsigned char* reloc_view, | |
134 | section_size_type reloc_view_size); | |
135 | ||
2e30d253 ILT |
136 | // Return a string used to fill a code section with nops. |
137 | std::string | |
8851ecca | 138 | do_code_fill(section_size_type length) const; |
2e30d253 | 139 | |
9a2d6984 ILT |
140 | // Return whether SYM is defined by the ABI. |
141 | bool | |
142 | do_is_defined_by_abi(Symbol* sym) const | |
143 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
144 | ||
96f2030e | 145 | // Return the size of the GOT section. |
fe8718a4 | 146 | section_size_type |
96f2030e ILT |
147 | got_size() |
148 | { | |
149 | gold_assert(this->got_ != NULL); | |
150 | return this->got_->data_size(); | |
151 | } | |
152 | ||
2e30d253 ILT |
153 | private: |
154 | // The class which scans relocations. | |
a036edd8 | 155 | class Scan |
2e30d253 | 156 | { |
a036edd8 ILT |
157 | public: |
158 | Scan() | |
159 | : issued_non_pic_error_(false) | |
160 | { } | |
161 | ||
2e30d253 ILT |
162 | inline void |
163 | local(const General_options& options, Symbol_table* symtab, | |
164 | Layout* layout, Target_x86_64* target, | |
165 | Sized_relobj<64, false>* object, | |
166 | unsigned int data_shndx, | |
07f397ab | 167 | Output_section* output_section, |
2e30d253 ILT |
168 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
169 | const elfcpp::Sym<64, false>& lsym); | |
170 | ||
171 | inline void | |
172 | global(const General_options& options, Symbol_table* symtab, | |
173 | Layout* layout, Target_x86_64* target, | |
174 | Sized_relobj<64, false>* object, | |
175 | unsigned int data_shndx, | |
07f397ab | 176 | Output_section* output_section, |
2e30d253 ILT |
177 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
178 | Symbol* gsym); | |
e041f13d | 179 | |
a036edd8 | 180 | private: |
e041f13d ILT |
181 | static void |
182 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
183 | ||
184 | static void | |
185 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
186 | Symbol*); | |
a036edd8 ILT |
187 | |
188 | void | |
189 | check_non_pic(Relobj*, unsigned int r_type); | |
190 | ||
191 | // Whether we have issued an error about a non-PIC compilation. | |
192 | bool issued_non_pic_error_; | |
2e30d253 ILT |
193 | }; |
194 | ||
195 | // The class which implements relocation. | |
196 | class Relocate | |
197 | { | |
198 | public: | |
199 | Relocate() | |
200 | : skip_call_tls_get_addr_(false) | |
201 | { } | |
202 | ||
203 | ~Relocate() | |
204 | { | |
205 | if (this->skip_call_tls_get_addr_) | |
206 | { | |
207 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 208 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
209 | } |
210 | } | |
211 | ||
212 | // Do a relocation. Return false if the caller should not issue | |
213 | // any warnings about this relocation. | |
214 | inline bool | |
215 | relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum, | |
216 | const elfcpp::Rela<64, false>&, | |
217 | unsigned int r_type, const Sized_symbol<64>*, | |
218 | const Symbol_value<64>*, | |
219 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 220 | section_size_type); |
2e30d253 ILT |
221 | |
222 | private: | |
223 | // Do a TLS relocation. | |
224 | inline void | |
7bf1f802 ILT |
225 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
226 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
227 | unsigned int r_type, const Sized_symbol<64>*, |
228 | const Symbol_value<64>*, | |
fe8718a4 ILT |
229 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
230 | section_size_type); | |
2e30d253 | 231 | |
c2b45e22 | 232 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
233 | inline void |
234 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
235 | Output_segment* tls_segment, | |
236 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
237 | elfcpp::Elf_types<64>::Elf_Addr value, | |
238 | unsigned char* view, | |
c2b45e22 | 239 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 240 | section_size_type view_size); |
7bf1f802 | 241 | |
56622147 ILT |
242 | // Do a TLS General-Dynamic to Local-Exec transition. |
243 | inline void | |
244 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
245 | Output_segment* tls_segment, |
246 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
247 | elfcpp::Elf_types<64>::Elf_Addr value, | |
248 | unsigned char* view, | |
fe8718a4 | 249 | section_size_type view_size); |
2e30d253 | 250 | |
c2b45e22 CC |
251 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
252 | inline void | |
253 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
254 | Output_segment* tls_segment, | |
255 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
256 | elfcpp::Elf_types<64>::Elf_Addr value, | |
257 | unsigned char* view, | |
258 | elfcpp::Elf_types<64>::Elf_Addr, | |
259 | section_size_type view_size); | |
260 | ||
261 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
262 | inline void | |
263 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
264 | Output_segment* tls_segment, | |
265 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
266 | elfcpp::Elf_types<64>::Elf_Addr value, | |
267 | unsigned char* view, | |
268 | section_size_type view_size); | |
269 | ||
56622147 | 270 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 271 | inline void |
56622147 | 272 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
273 | Output_segment* tls_segment, |
274 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
275 | elfcpp::Elf_types<64>::Elf_Addr value, | |
276 | unsigned char* view, | |
fe8718a4 | 277 | section_size_type view_size); |
2e30d253 | 278 | |
56622147 ILT |
279 | // Do a TLS Initial-Exec to Local-Exec transition. |
280 | static inline void | |
281 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
282 | Output_segment* tls_segment, |
283 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
284 | elfcpp::Elf_types<64>::Elf_Addr value, | |
285 | unsigned char* view, | |
fe8718a4 | 286 | section_size_type view_size); |
2e30d253 ILT |
287 | |
288 | // This is set if we should skip the next reloc, which should be a | |
289 | // PLT32 reloc against ___tls_get_addr. | |
290 | bool skip_call_tls_get_addr_; | |
291 | }; | |
292 | ||
6a74a719 ILT |
293 | // A class which returns the size required for a relocation type, |
294 | // used while scanning relocs during a relocatable link. | |
295 | class Relocatable_size_for_reloc | |
296 | { | |
297 | public: | |
298 | unsigned int | |
299 | get_size_for_reloc(unsigned int, Relobj*); | |
300 | }; | |
301 | ||
2e30d253 ILT |
302 | // Adjust TLS relocation type based on the options and whether this |
303 | // is a local symbol. | |
e041f13d | 304 | static tls::Tls_optimization |
2e30d253 ILT |
305 | optimize_tls_reloc(bool is_final, int r_type); |
306 | ||
307 | // Get the GOT section, creating it if necessary. | |
308 | Output_data_got<64, false>* | |
309 | got_section(Symbol_table*, Layout*); | |
310 | ||
96f2030e ILT |
311 | // Get the GOT PLT section. |
312 | Output_data_space* | |
313 | got_plt_section() const | |
314 | { | |
315 | gold_assert(this->got_plt_ != NULL); | |
316 | return this->got_plt_; | |
317 | } | |
318 | ||
c2b45e22 CC |
319 | // Create the PLT section. |
320 | void | |
321 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
322 | ||
2e30d253 ILT |
323 | // Create a PLT entry for a global symbol. |
324 | void | |
325 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
326 | ||
edfbb029 CC |
327 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
328 | void | |
329 | define_tls_base_symbol(Symbol_table*, Layout*); | |
330 | ||
c2b45e22 CC |
331 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
332 | void | |
333 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
334 | ||
31d60480 ILT |
335 | // Create a GOT entry for the TLS module index. |
336 | unsigned int | |
337 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
338 | Sized_relobj<64, false>* object); | |
339 | ||
2e30d253 ILT |
340 | // Get the PLT section. |
341 | Output_data_plt_x86_64* | |
342 | plt_section() const | |
343 | { | |
344 | gold_assert(this->plt_ != NULL); | |
345 | return this->plt_; | |
346 | } | |
347 | ||
348 | // Get the dynamic reloc section, creating it if necessary. | |
349 | Reloc_section* | |
0ffd9845 | 350 | rela_dyn_section(Layout*); |
2e30d253 | 351 | |
d61c6bd4 ILT |
352 | // Return true if the symbol may need a COPY relocation. |
353 | // References from an executable object to non-function symbols | |
354 | // defined in a dynamic object may need a COPY relocation. | |
355 | bool | |
356 | may_need_copy_reloc(Symbol* gsym) | |
357 | { | |
8851ecca | 358 | return (!parameters->options().shared() |
d61c6bd4 ILT |
359 | && gsym->is_from_dynobj() |
360 | && gsym->type() != elfcpp::STT_FUNC); | |
361 | } | |
362 | ||
12c0daef | 363 | // Add a potential copy relocation. |
2e30d253 | 364 | void |
12c0daef ILT |
365 | copy_reloc(Symbol_table* symtab, Layout* layout, Relobj* object, |
366 | unsigned int shndx, Output_section* output_section, | |
367 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
368 | { | |
369 | this->copy_relocs_.copy_reloc(symtab, layout, | |
370 | symtab->get_sized_symbol<64>(sym), | |
371 | object, shndx, output_section, | |
372 | reloc, this->rela_dyn_section(layout)); | |
373 | } | |
2e30d253 ILT |
374 | |
375 | // Information about this specific target which we pass to the | |
376 | // general Target structure. | |
377 | static const Target::Target_info x86_64_info; | |
378 | ||
0a65a3a7 CC |
379 | enum Got_type |
380 | { | |
381 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
382 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
383 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
384 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
385 | }; | |
386 | ||
2e30d253 ILT |
387 | // The GOT section. |
388 | Output_data_got<64, false>* got_; | |
389 | // The PLT section. | |
390 | Output_data_plt_x86_64* plt_; | |
391 | // The GOT PLT section. | |
392 | Output_data_space* got_plt_; | |
393 | // The dynamic reloc section. | |
0ffd9845 | 394 | Reloc_section* rela_dyn_; |
2e30d253 | 395 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 396 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
397 | // Space for variables copied with a COPY reloc. |
398 | Output_data_space* dynbss_; | |
c2b45e22 | 399 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 400 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
401 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
402 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
403 | }; |
404 | ||
405 | const Target::Target_info Target_x86_64::x86_64_info = | |
406 | { | |
407 | 64, // size | |
408 | false, // is_big_endian | |
409 | elfcpp::EM_X86_64, // machine_code | |
410 | false, // has_make_symbol | |
411 | false, // has_resolve | |
412 | true, // has_code_fill | |
35cdfc9a | 413 | true, // is_default_stack_executable |
0864d551 | 414 | '\0', // wrap_char |
2e30d253 | 415 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 416 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
417 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
418 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
419 | }; |
420 | ||
421 | // Get the GOT section, creating it if necessary. | |
422 | ||
423 | Output_data_got<64, false>* | |
424 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
425 | { | |
426 | if (this->got_ == NULL) | |
427 | { | |
428 | gold_assert(symtab != NULL && layout != NULL); | |
429 | ||
430 | this->got_ = new Output_data_got<64, false>(); | |
431 | ||
432 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
433 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
434 | this->got_); | |
435 | ||
436 | // The old GNU linker creates a .got.plt section. We just | |
437 | // create another set of data in the .got section. Note that we | |
438 | // always create a PLT if we create a GOT, although the PLT | |
439 | // might be empty. | |
2e30d253 ILT |
440 | this->got_plt_ = new Output_data_space(8); |
441 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
442 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
443 | this->got_plt_); | |
444 | ||
445 | // The first three entries are reserved. | |
27bc2bce | 446 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
447 | |
448 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 449 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
450 | this->got_plt_, |
451 | 0, 0, elfcpp::STT_OBJECT, | |
452 | elfcpp::STB_LOCAL, | |
453 | elfcpp::STV_HIDDEN, 0, | |
454 | false, false); | |
455 | } | |
456 | ||
457 | return this->got_; | |
458 | } | |
459 | ||
460 | // Get the dynamic reloc section, creating it if necessary. | |
461 | ||
462 | Target_x86_64::Reloc_section* | |
0ffd9845 | 463 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 464 | { |
0ffd9845 | 465 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
466 | { |
467 | gold_assert(layout != NULL); | |
0ffd9845 | 468 | this->rela_dyn_ = new Reloc_section(); |
2e30d253 | 469 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 470 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 471 | } |
0ffd9845 | 472 | return this->rela_dyn_; |
2e30d253 ILT |
473 | } |
474 | ||
475 | // A class to handle the PLT data. | |
476 | ||
477 | class Output_data_plt_x86_64 : public Output_section_data | |
478 | { | |
479 | public: | |
480 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
481 | ||
c2b45e22 CC |
482 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
483 | Output_data_space*); | |
2e30d253 ILT |
484 | |
485 | // Add an entry to the PLT. | |
486 | void | |
487 | add_entry(Symbol* gsym); | |
488 | ||
c2b45e22 CC |
489 | // Add the reserved TLSDESC_PLT entry to the PLT. |
490 | void | |
491 | reserve_tlsdesc_entry(unsigned int got_offset) | |
492 | { this->tlsdesc_got_offset_ = got_offset; } | |
493 | ||
494 | // Return true if a TLSDESC_PLT entry has been reserved. | |
495 | bool | |
496 | has_tlsdesc_entry() const | |
497 | { return this->tlsdesc_got_offset_ != -1U; } | |
498 | ||
499 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
500 | unsigned int | |
501 | get_tlsdesc_got_offset() const | |
502 | { return this->tlsdesc_got_offset_; } | |
503 | ||
504 | // Return the offset of the reserved TLSDESC_PLT entry. | |
505 | unsigned int | |
506 | get_tlsdesc_plt_offset() const | |
507 | { return (this->count_ + 1) * plt_entry_size; } | |
508 | ||
2e30d253 ILT |
509 | // Return the .rel.plt section data. |
510 | const Reloc_section* | |
511 | rel_plt() const | |
512 | { return this->rel_; } | |
513 | ||
514 | protected: | |
515 | void | |
516 | do_adjust_output_section(Output_section* os); | |
517 | ||
518 | private: | |
519 | // The size of an entry in the PLT. | |
520 | static const int plt_entry_size = 16; | |
521 | ||
522 | // The first entry in the PLT. | |
523 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
524 | // procedure linkage table for both programs and shared objects." | |
525 | static unsigned char first_plt_entry[plt_entry_size]; | |
526 | ||
527 | // Other entries in the PLT for an executable. | |
528 | static unsigned char plt_entry[plt_entry_size]; | |
529 | ||
c2b45e22 CC |
530 | // The reserved TLSDESC entry in the PLT for an executable. |
531 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
532 | ||
2e30d253 ILT |
533 | // Set the final size. |
534 | void | |
c2b45e22 | 535 | set_final_data_size(); |
2e30d253 ILT |
536 | |
537 | // Write out the PLT data. | |
538 | void | |
539 | do_write(Output_file*); | |
540 | ||
541 | // The reloc section. | |
542 | Reloc_section* rel_; | |
c2b45e22 CC |
543 | // The .got section. |
544 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
545 | // The .got.plt section. |
546 | Output_data_space* got_plt_; | |
547 | // The number of PLT entries. | |
548 | unsigned int count_; | |
c2b45e22 CC |
549 | // Offset of the reserved TLSDESC_GOT entry when needed. |
550 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
551 | }; |
552 | ||
553 | // Create the PLT section. The ordinary .got section is an argument, | |
554 | // since we need to refer to the start. We also create our own .got | |
555 | // section just for PLT entries. | |
556 | ||
557 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 558 | Output_data_got<64, false>* got, |
2e30d253 | 559 | Output_data_space* got_plt) |
c2b45e22 CC |
560 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
561 | tlsdesc_got_offset_(-1U) | |
2e30d253 ILT |
562 | { |
563 | this->rel_ = new Reloc_section(); | |
564 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
565 | elfcpp::SHF_ALLOC, this->rel_); | |
566 | } | |
567 | ||
568 | void | |
569 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
570 | { | |
571 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
572 | // linker, and so do we. | |
573 | os->set_entsize(4); | |
574 | } | |
575 | ||
576 | // Add an entry to the PLT. | |
577 | ||
578 | void | |
579 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
580 | { | |
581 | gold_assert(!gsym->has_plt_offset()); | |
582 | ||
583 | // Note that when setting the PLT offset we skip the initial | |
584 | // reserved PLT entry. | |
585 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
586 | ||
587 | ++this->count_; | |
588 | ||
fe8718a4 | 589 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
590 | |
591 | // Every PLT entry needs a GOT entry which points back to the PLT | |
592 | // entry (this will be changed by the dynamic linker, normally | |
593 | // lazily when the function is called). | |
27bc2bce | 594 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
595 | |
596 | // Every PLT entry needs a reloc. | |
597 | gsym->set_needs_dynsym_entry(); | |
598 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
599 | got_offset, 0); | |
600 | ||
601 | // Note that we don't need to save the symbol. The contents of the | |
602 | // PLT are independent of which symbols are used. The symbols only | |
603 | // appear in the relocations. | |
604 | } | |
605 | ||
c2b45e22 CC |
606 | // Set the final size. |
607 | void | |
608 | Output_data_plt_x86_64::set_final_data_size() | |
609 | { | |
610 | unsigned int count = this->count_; | |
611 | if (this->has_tlsdesc_entry()) | |
612 | ++count; | |
613 | this->set_data_size((count + 1) * plt_entry_size); | |
614 | } | |
615 | ||
2e30d253 ILT |
616 | // The first entry in the PLT for an executable. |
617 | ||
618 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
619 | { | |
620 | // From AMD64 ABI Draft 0.98, page 76 | |
621 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 622 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
623 | 0xff, 0x25, // jmp indirect |
624 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
625 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
626 | }; | |
627 | ||
628 | // Subsequent entries in the PLT for an executable. | |
629 | ||
630 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
631 | { | |
632 | // From AMD64 ABI Draft 0.98, page 76 | |
633 | 0xff, 0x25, // jmpq indirect | |
634 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
635 | 0x68, // pushq immediate | |
636 | 0, 0, 0, 0, // replaced with offset into relocation table | |
637 | 0xe9, // jmpq relative | |
638 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
639 | }; | |
640 | ||
c2b45e22 CC |
641 | // The reserved TLSDESC entry in the PLT for an executable. |
642 | ||
643 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
644 | { | |
645 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
646 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
647 | 0xff, 0x35, // pushq x(%rip) | |
648 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
649 | 0xff, 0x25, // jmpq *y(%rip) | |
650 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
651 | 0x0f, 0x1f, // nop | |
652 | 0x40, 0 | |
653 | }; | |
654 | ||
2e30d253 ILT |
655 | // Write out the PLT. This uses the hand-coded instructions above, |
656 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
657 | ||
658 | void | |
659 | Output_data_plt_x86_64::do_write(Output_file* of) | |
660 | { | |
661 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
662 | const section_size_type oview_size = |
663 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
664 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
665 | ||
666 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
667 | const section_size_type got_size = |
668 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
669 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
670 | got_size); | |
671 | ||
672 | unsigned char* pov = oview; | |
673 | ||
c2b45e22 | 674 | // The base address of the .plt section. |
2e30d253 | 675 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); |
c2b45e22 CC |
676 | // The base address of the .got section. |
677 | elfcpp::Elf_types<32>::Elf_Addr got_base = this->got_->address(); | |
678 | // The base address of the PLT portion of the .got section, | |
679 | // which is where the GOT pointer will point, and where the | |
680 | // three reserved GOT entries are located. | |
2e30d253 ILT |
681 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); |
682 | ||
683 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd ILT |
684 | // We do a jmp relative to the PC at the end of this instruction. |
685 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 8 | |
686 | - (plt_address + 6)); | |
687 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 16 | |
688 | - (plt_address + 12)); | |
2e30d253 ILT |
689 | pov += plt_entry_size; |
690 | ||
691 | unsigned char* got_pov = got_view; | |
692 | ||
693 | memset(got_pov, 0, 24); | |
694 | got_pov += 24; | |
695 | ||
696 | unsigned int plt_offset = plt_entry_size; | |
697 | unsigned int got_offset = 24; | |
698 | const unsigned int count = this->count_; | |
699 | for (unsigned int plt_index = 0; | |
700 | plt_index < count; | |
701 | ++plt_index, | |
702 | pov += plt_entry_size, | |
703 | got_pov += 8, | |
704 | plt_offset += plt_entry_size, | |
705 | got_offset += 8) | |
706 | { | |
707 | // Set and adjust the PLT entry itself. | |
708 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
709 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
710 | (got_address + got_offset | |
711 | - (plt_address + plt_offset | |
712 | + 6))); | |
2e30d253 ILT |
713 | |
714 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
715 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
716 | - (plt_offset + plt_entry_size)); | |
717 | ||
718 | // Set the entry in the GOT. | |
719 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
720 | } | |
721 | ||
c2b45e22 CC |
722 | if (this->has_tlsdesc_entry()) |
723 | { | |
724 | // Set and adjust the reserved TLSDESC PLT entry. | |
725 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
726 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
727 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
728 | (got_address + 8 | |
729 | - (plt_address + plt_offset | |
730 | + 6))); | |
731 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
732 | (got_base | |
733 | + tlsdesc_got_offset | |
734 | - (plt_address + plt_offset | |
735 | + 12))); | |
736 | pov += plt_entry_size; | |
737 | } | |
738 | ||
fe8718a4 ILT |
739 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
740 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
741 | |
742 | of->write_output_view(offset, oview_size, oview); | |
743 | of->write_output_view(got_file_offset, got_size, got_view); | |
744 | } | |
745 | ||
c2b45e22 | 746 | // Create the PLT section. |
2e30d253 ILT |
747 | |
748 | void | |
c2b45e22 | 749 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 750 | { |
2e30d253 ILT |
751 | if (this->plt_ == NULL) |
752 | { | |
753 | // Create the GOT sections first. | |
754 | this->got_section(symtab, layout); | |
755 | ||
c2b45e22 CC |
756 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
757 | this->got_plt_); | |
2e30d253 ILT |
758 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
759 | (elfcpp::SHF_ALLOC | |
760 | | elfcpp::SHF_EXECINSTR), | |
761 | this->plt_); | |
762 | } | |
c2b45e22 CC |
763 | } |
764 | ||
765 | // Create a PLT entry for a global symbol. | |
766 | ||
767 | void | |
768 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
769 | Symbol* gsym) | |
770 | { | |
771 | if (gsym->has_plt_offset()) | |
772 | return; | |
773 | ||
774 | if (this->plt_ == NULL) | |
775 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
776 | |
777 | this->plt_->add_entry(gsym); | |
778 | } | |
779 | ||
edfbb029 CC |
780 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
781 | ||
782 | void | |
783 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
784 | { | |
785 | if (this->tls_base_symbol_defined_) | |
786 | return; | |
787 | ||
788 | Output_segment* tls_segment = layout->tls_segment(); | |
789 | if (tls_segment != NULL) | |
790 | { | |
791 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, | |
792 | tls_segment, 0, 0, | |
793 | elfcpp::STT_TLS, | |
794 | elfcpp::STB_LOCAL, | |
795 | elfcpp::STV_HIDDEN, 0, | |
796 | Symbol::SEGMENT_END, true); | |
797 | } | |
798 | this->tls_base_symbol_defined_ = true; | |
799 | } | |
800 | ||
c2b45e22 CC |
801 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
802 | ||
803 | void | |
804 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
805 | Layout* layout) | |
806 | { | |
807 | if (this->plt_ == NULL) | |
808 | this->make_plt_section(symtab, layout); | |
809 | ||
810 | if (!this->plt_->has_tlsdesc_entry()) | |
811 | { | |
812 | // Allocate the TLSDESC_GOT entry. | |
813 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
814 | unsigned int got_offset = got->add_constant(0); | |
815 | ||
816 | // Allocate the TLSDESC_PLT entry. | |
817 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
818 | } | |
819 | } | |
820 | ||
31d60480 ILT |
821 | // Create a GOT entry for the TLS module index. |
822 | ||
823 | unsigned int | |
824 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
825 | Sized_relobj<64, false>* object) | |
826 | { | |
827 | if (this->got_mod_index_offset_ == -1U) | |
828 | { | |
829 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
830 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
831 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
832 | unsigned int got_offset = got->add_constant(0); | |
833 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
834 | got_offset, 0); | |
009a67a2 | 835 | got->add_constant(0); |
31d60480 ILT |
836 | this->got_mod_index_offset_ = got_offset; |
837 | } | |
838 | return this->got_mod_index_offset_; | |
839 | } | |
840 | ||
2e30d253 ILT |
841 | // Optimize the TLS relocation type based on what we know about the |
842 | // symbol. IS_FINAL is true if the final address of this symbol is | |
843 | // known at link time. | |
844 | ||
e041f13d | 845 | tls::Tls_optimization |
2e30d253 ILT |
846 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
847 | { | |
2e30d253 ILT |
848 | // If we are generating a shared library, then we can't do anything |
849 | // in the linker. | |
8851ecca | 850 | if (parameters->options().shared()) |
e041f13d | 851 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
852 | |
853 | switch (r_type) | |
854 | { | |
855 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
856 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
857 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
858 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
859 | // access. Since we know that we are generating an executable, |
860 | // we can convert this to Initial-Exec. If we also know that | |
861 | // this is a local symbol, we can further switch to Local-Exec. | |
862 | if (is_final) | |
e041f13d ILT |
863 | return tls::TLSOPT_TO_LE; |
864 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 865 | |
d61c17ea | 866 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
867 | // This is Local-Dynamic, which refers to a local symbol in the |
868 | // dynamic TLS block. Since we know that we generating an | |
869 | // executable, we can switch to Local-Exec. | |
e041f13d | 870 | return tls::TLSOPT_TO_LE; |
2e30d253 | 871 | |
0ffd9845 | 872 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
873 | case elfcpp::R_X86_64_DTPOFF64: |
874 | // Another Local-Dynamic reloc. | |
e041f13d | 875 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 876 | |
d61c17ea | 877 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
878 | // These are Initial-Exec relocs which get the thread offset |
879 | // from the GOT. If we know that we are linking against the | |
880 | // local symbol, we can switch to Local-Exec, which links the | |
881 | // thread offset into the instruction. | |
882 | if (is_final) | |
e041f13d ILT |
883 | return tls::TLSOPT_TO_LE; |
884 | return tls::TLSOPT_NONE; | |
2e30d253 | 885 | |
d61c17ea | 886 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
887 | // When we already have Local-Exec, there is nothing further we |
888 | // can do. | |
e041f13d | 889 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
890 | |
891 | default: | |
892 | gold_unreachable(); | |
893 | } | |
2e30d253 ILT |
894 | } |
895 | ||
e041f13d ILT |
896 | // Report an unsupported relocation against a local symbol. |
897 | ||
898 | void | |
899 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
900 | unsigned int r_type) | |
901 | { | |
75f2446e ILT |
902 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
903 | object->name().c_str(), r_type); | |
e041f13d ILT |
904 | } |
905 | ||
a036edd8 ILT |
906 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
907 | // dynamic linker does not support it, issue an error. The GNU linker | |
908 | // only issues a non-PIC error for an allocated read-only section. | |
909 | // Here we know the section is allocated, but we don't know that it is | |
910 | // read-only. But we check for all the relocation types which the | |
911 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
912 | // error even if the section is not read-only. | |
913 | ||
914 | void | |
915 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
916 | { | |
917 | switch (r_type) | |
918 | { | |
919 | // These are the relocation types supported by glibc for x86_64. | |
920 | case elfcpp::R_X86_64_RELATIVE: | |
921 | case elfcpp::R_X86_64_GLOB_DAT: | |
922 | case elfcpp::R_X86_64_JUMP_SLOT: | |
923 | case elfcpp::R_X86_64_DTPMOD64: | |
924 | case elfcpp::R_X86_64_DTPOFF64: | |
925 | case elfcpp::R_X86_64_TPOFF64: | |
926 | case elfcpp::R_X86_64_64: | |
927 | case elfcpp::R_X86_64_32: | |
928 | case elfcpp::R_X86_64_PC32: | |
929 | case elfcpp::R_X86_64_COPY: | |
930 | return; | |
931 | ||
932 | default: | |
933 | // This prevents us from issuing more than one error per reloc | |
934 | // section. But we can still wind up issuing more than one | |
935 | // error per object file. | |
936 | if (this->issued_non_pic_error_) | |
937 | return; | |
938 | object->error(_("requires unsupported dynamic reloc; " | |
939 | "recompile with -fPIC")); | |
940 | this->issued_non_pic_error_ = true; | |
941 | return; | |
942 | ||
943 | case elfcpp::R_X86_64_NONE: | |
944 | gold_unreachable(); | |
945 | } | |
946 | } | |
947 | ||
2e30d253 ILT |
948 | // Scan a relocation for a local symbol. |
949 | ||
950 | inline void | |
951 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
952 | Symbol_table* symtab, |
953 | Layout* layout, | |
954 | Target_x86_64* target, | |
955 | Sized_relobj<64, false>* object, | |
0ffd9845 | 956 | unsigned int data_shndx, |
4f4c5f80 | 957 | Output_section* output_section, |
0ffd9845 | 958 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 959 | unsigned int r_type, |
7bf1f802 | 960 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
961 | { |
962 | switch (r_type) | |
963 | { | |
964 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
965 | case elfcpp::R_386_GNU_VTINHERIT: |
966 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
967 | break; |
968 | ||
969 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 970 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
971 | // executable), we need to create a dynamic relocation for this |
972 | // location. The relocation applied at link time will apply the | |
973 | // link-time value, so we flag the location with an | |
974 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 975 | // relocate it easily. |
8851ecca | 976 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 977 | { |
e8c846c3 | 978 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 979 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
980 | rela_dyn->add_local_relative(object, r_sym, |
981 | elfcpp::R_X86_64_RELATIVE, | |
982 | output_section, data_shndx, | |
983 | reloc.get_r_offset(), | |
984 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
985 | } |
986 | break; | |
987 | ||
2e30d253 ILT |
988 | case elfcpp::R_X86_64_32: |
989 | case elfcpp::R_X86_64_32S: | |
990 | case elfcpp::R_X86_64_16: | |
991 | case elfcpp::R_X86_64_8: | |
96f2030e | 992 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
993 | // executable), we need to create a dynamic relocation for this |
994 | // location. We can't use an R_X86_64_RELATIVE relocation | |
995 | // because that is always a 64-bit relocation. | |
8851ecca | 996 | if (parameters->options().output_is_position_independent()) |
96f2030e | 997 | { |
a036edd8 ILT |
998 | this->check_non_pic(object, r_type); |
999 | ||
96f2030e | 1000 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1001 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1002 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1003 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1004 | data_shndx, reloc.get_r_offset(), | |
1005 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1006 | else |
1007 | { | |
1008 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1009 | unsigned int shndx = lsym.get_st_shndx(); |
1010 | bool is_ordinary; | |
1011 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1012 | &is_ordinary); | |
1013 | if (!is_ordinary) | |
1014 | object->error(_("section symbol %u has bad shndx %u"), | |
1015 | r_sym, shndx); | |
1016 | else | |
1017 | rela_dyn->add_local_section(object, shndx, | |
1018 | r_type, output_section, | |
1019 | data_shndx, reloc.get_r_offset(), | |
1020 | reloc.get_r_addend()); | |
dceae3c1 | 1021 | } |
96f2030e | 1022 | } |
2e30d253 ILT |
1023 | break; |
1024 | ||
1025 | case elfcpp::R_X86_64_PC64: | |
1026 | case elfcpp::R_X86_64_PC32: | |
1027 | case elfcpp::R_X86_64_PC16: | |
1028 | case elfcpp::R_X86_64_PC8: | |
1029 | break; | |
1030 | ||
f389a824 ILT |
1031 | case elfcpp::R_X86_64_PLT32: |
1032 | // Since we know this is a local symbol, we can handle this as a | |
1033 | // PC32 reloc. | |
1034 | break; | |
1035 | ||
fdc2f80f | 1036 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1037 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1038 | case elfcpp::R_X86_64_GOTPC64: |
1039 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1040 | // We need a GOT section. |
1041 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1042 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1043 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1044 | break; |
1045 | ||
0ffd9845 ILT |
1046 | case elfcpp::R_X86_64_GOT64: |
1047 | case elfcpp::R_X86_64_GOT32: | |
1048 | case elfcpp::R_X86_64_GOTPCREL64: | |
1049 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1050 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1051 | { |
1052 | // The symbol requires a GOT entry. | |
1053 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1054 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1055 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1056 | { |
1057 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1058 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1059 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1060 | { |
1061 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1062 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1063 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1064 | rela_dyn->add_local_relative( |
1065 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1066 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1067 | else |
dceae3c1 | 1068 | { |
a036edd8 ILT |
1069 | this->check_non_pic(object, r_type); |
1070 | ||
dceae3c1 | 1071 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1072 | rela_dyn->add_local( |
1073 | object, r_sym, r_type, got, | |
1074 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1075 | } |
0ffd9845 ILT |
1076 | } |
1077 | } | |
ee9e9e86 ILT |
1078 | // For GOTPLT64, we'd normally want a PLT section, but since |
1079 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1080 | } |
1081 | break; | |
1082 | ||
2e30d253 ILT |
1083 | case elfcpp::R_X86_64_COPY: |
1084 | case elfcpp::R_X86_64_GLOB_DAT: | |
1085 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1086 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1087 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1088 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1089 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1090 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1091 | gold_error(_("%s: unexpected reloc %u in object file"), |
1092 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1093 | break; |
1094 | ||
d61c17ea | 1095 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1096 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1097 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1098 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1099 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1100 | case elfcpp::R_X86_64_DTPOFF32: |
1101 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1102 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1103 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1104 | { |
8851ecca | 1105 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1106 | const tls::Tls_optimization optimized_type |
1107 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1108 | switch (r_type) |
1109 | { | |
56622147 | 1110 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1111 | if (optimized_type == tls::TLSOPT_NONE) |
1112 | { | |
1113 | // Create a pair of GOT entries for the module index and | |
1114 | // dtv-relative offset. | |
1115 | Output_data_got<64, false>* got | |
1116 | = target->got_section(symtab, layout); | |
1117 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1118 | unsigned int shndx = lsym.get_st_shndx(); |
1119 | bool is_ordinary; | |
1120 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1121 | if (!is_ordinary) | |
1122 | object->error(_("local symbol %u has bad shndx %u"), | |
1123 | r_sym, shndx); | |
1124 | else | |
1125 | got->add_local_pair_with_rela(object, r_sym, | |
1126 | shndx, | |
1127 | GOT_TYPE_TLS_PAIR, | |
1128 | target->rela_dyn_section(layout), | |
1129 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1130 | } |
1131 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1132 | unsupported_reloc_local(object, r_type); | |
1133 | break; | |
1134 | ||
56622147 | 1135 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1136 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1137 | if (optimized_type == tls::TLSOPT_NONE) |
1138 | { | |
1139 | // Create reserved PLT and GOT entries for the resolver. | |
1140 | target->reserve_tlsdesc_entries(symtab, layout); | |
1141 | ||
1142 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1143 | Output_data_got<64, false>* got | |
1144 | = target->got_section(symtab, layout); | |
1145 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1146 | unsigned int shndx = lsym.get_st_shndx(); |
1147 | bool is_ordinary; | |
1148 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1149 | if (!is_ordinary) | |
1150 | object->error(_("local symbol %u has bad shndx %u"), | |
1151 | r_sym, shndx); | |
1152 | else | |
1153 | got->add_local_pair_with_rela(object, r_sym, | |
1154 | shndx, | |
1155 | GOT_TYPE_TLS_DESC, | |
1156 | target->rela_dyn_section(layout), | |
1157 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1158 | } |
1159 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1160 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1161 | break; |
1162 | ||
c2b45e22 CC |
1163 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1164 | break; | |
1165 | ||
e041f13d | 1166 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1167 | if (optimized_type == tls::TLSOPT_NONE) |
1168 | { | |
1169 | // Create a GOT entry for the module index. | |
31d60480 | 1170 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1171 | } |
1172 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1173 | unsupported_reloc_local(object, r_type); | |
1174 | break; | |
1175 | ||
0ffd9845 ILT |
1176 | case elfcpp::R_X86_64_DTPOFF32: |
1177 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1178 | break; |
1179 | ||
56622147 | 1180 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1181 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1182 | if (optimized_type == tls::TLSOPT_NONE) |
1183 | { | |
1184 | // Create a GOT entry for the tp-relative offset. | |
1185 | Output_data_got<64, false>* got | |
1186 | = target->got_section(symtab, layout); | |
1187 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1188 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1189 | target->rela_dyn_section(layout), |
1190 | elfcpp::R_X86_64_TPOFF64); | |
1191 | } | |
1192 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1193 | unsupported_reloc_local(object, r_type); |
1194 | break; | |
0ffd9845 | 1195 | |
56622147 | 1196 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1197 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1198 | if (output_is_shared) |
1199 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1200 | break; |
e041f13d ILT |
1201 | |
1202 | default: | |
1203 | gold_unreachable(); | |
2e30d253 ILT |
1204 | } |
1205 | } | |
1206 | break; | |
2e30d253 | 1207 | |
fdc2f80f ILT |
1208 | case elfcpp::R_X86_64_SIZE32: |
1209 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1210 | default: |
75f2446e ILT |
1211 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1212 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1213 | break; |
1214 | } | |
1215 | } | |
1216 | ||
1217 | ||
e041f13d ILT |
1218 | // Report an unsupported relocation against a global symbol. |
1219 | ||
1220 | void | |
1221 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1222 | unsigned int r_type, | |
1223 | Symbol* gsym) | |
1224 | { | |
75f2446e | 1225 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1226 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1227 | } |
1228 | ||
2e30d253 ILT |
1229 | // Scan a relocation for a global symbol. |
1230 | ||
1231 | inline void | |
12c0daef | 1232 | Target_x86_64::Scan::global(const General_options&, |
d61c17ea ILT |
1233 | Symbol_table* symtab, |
1234 | Layout* layout, | |
1235 | Target_x86_64* target, | |
1236 | Sized_relobj<64, false>* object, | |
1237 | unsigned int data_shndx, | |
4f4c5f80 | 1238 | Output_section* output_section, |
d61c17ea ILT |
1239 | const elfcpp::Rela<64, false>& reloc, |
1240 | unsigned int r_type, | |
1241 | Symbol* gsym) | |
2e30d253 ILT |
1242 | { |
1243 | switch (r_type) | |
1244 | { | |
1245 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1246 | case elfcpp::R_386_GNU_VTINHERIT: |
1247 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1248 | break; |
1249 | ||
1250 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1251 | case elfcpp::R_X86_64_32: |
1252 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1253 | case elfcpp::R_X86_64_16: |
2e30d253 | 1254 | case elfcpp::R_X86_64_8: |
96f2030e | 1255 | { |
d61c6bd4 ILT |
1256 | // Make a PLT entry if necessary. |
1257 | if (gsym->needs_plt_entry()) | |
1258 | { | |
1259 | target->make_plt_entry(symtab, layout, gsym); | |
1260 | // Since this is not a PC-relative relocation, we may be | |
1261 | // taking the address of a function. In that case we need to | |
1262 | // set the entry in the dynamic symbol table to the address of | |
1263 | // the PLT entry. | |
8851ecca | 1264 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1265 | gsym->set_needs_dynsym_value(); |
1266 | } | |
1267 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1268 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1269 | { |
1270 | if (target->may_need_copy_reloc(gsym)) | |
1271 | { | |
12c0daef | 1272 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1273 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1274 | } |
1275 | else if (r_type == elfcpp::R_X86_64_64 | |
1276 | && gsym->can_use_relative_reloc(false)) | |
1277 | { | |
1278 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1279 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1280 | output_section, object, | |
1281 | data_shndx, reloc.get_r_offset(), | |
1282 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1283 | } |
1284 | else | |
1285 | { | |
a036edd8 | 1286 | this->check_non_pic(object, r_type); |
96f2030e | 1287 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1288 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1289 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1290 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1291 | } |
1292 | } | |
1293 | } | |
1294 | break; | |
1295 | ||
1296 | case elfcpp::R_X86_64_PC64: | |
1297 | case elfcpp::R_X86_64_PC32: | |
1298 | case elfcpp::R_X86_64_PC16: | |
1299 | case elfcpp::R_X86_64_PC8: | |
1300 | { | |
1301 | // Make a PLT entry if necessary. | |
1302 | if (gsym->needs_plt_entry()) | |
1303 | target->make_plt_entry(symtab, layout, gsym); | |
1304 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1305 | int flags = Symbol::NON_PIC_REF; |
1306 | if (gsym->type() == elfcpp::STT_FUNC) | |
1307 | flags |= Symbol::FUNCTION_CALL; | |
1308 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1309 | { |
d61c6bd4 ILT |
1310 | if (target->may_need_copy_reloc(gsym)) |
1311 | { | |
12c0daef | 1312 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1313 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1314 | } |
86849f1f | 1315 | else |
d61c6bd4 | 1316 | { |
a036edd8 | 1317 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1318 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1319 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1320 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1321 | reloc.get_r_addend()); |
1322 | } | |
86849f1f | 1323 | } |
d61c6bd4 | 1324 | } |
2e30d253 ILT |
1325 | break; |
1326 | ||
ff006520 | 1327 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1328 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1329 | case elfcpp::R_X86_64_GOTPCREL64: |
1330 | case elfcpp::R_X86_64_GOTPCREL: | |
1331 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1332 | { |
1333 | // The symbol requires a GOT entry. | |
1334 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1335 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1336 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1337 | else |
1338 | { | |
2e30d253 ILT |
1339 | // If this symbol is not fully resolved, we need to add a |
1340 | // dynamic relocation for it. | |
7bf1f802 | 1341 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1342 | if (gsym->is_from_dynobj() |
1343 | || gsym->is_undefined() | |
1344 | || gsym->is_preemptible()) | |
0a65a3a7 | 1345 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1346 | elfcpp::R_X86_64_GLOB_DAT); |
1347 | else | |
2e30d253 | 1348 | { |
0a65a3a7 CC |
1349 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1350 | rela_dyn->add_global_relative( | |
1351 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1352 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1353 | } |
1354 | } | |
ee9e9e86 ILT |
1355 | // For GOTPLT64, we also need a PLT entry (but only if the |
1356 | // symbol is not fully resolved). | |
1357 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1358 | && !gsym->final_value_is_known()) | |
1359 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1360 | } |
1361 | break; | |
1362 | ||
1363 | case elfcpp::R_X86_64_PLT32: | |
1364 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1365 | // Otherwise we need a PLT entry. | |
1366 | if (gsym->final_value_is_known()) | |
1367 | break; | |
96f2030e ILT |
1368 | // If building a shared library, we can also skip the PLT entry |
1369 | // if the symbol is defined in the output file and is protected | |
1370 | // or hidden. | |
1371 | if (gsym->is_defined() | |
1372 | && !gsym->is_from_dynobj() | |
1373 | && !gsym->is_preemptible()) | |
1374 | break; | |
2e30d253 ILT |
1375 | target->make_plt_entry(symtab, layout, gsym); |
1376 | break; | |
1377 | ||
fdc2f80f | 1378 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1379 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1380 | case elfcpp::R_X86_64_GOTPC64: |
1381 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1382 | // We need a GOT section. |
1383 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1384 | // For PLTOFF64, we also need a PLT entry (but only if the |
1385 | // symbol is not fully resolved). | |
1386 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1387 | && !gsym->final_value_is_known()) | |
1388 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1389 | break; |
1390 | ||
2e30d253 ILT |
1391 | case elfcpp::R_X86_64_COPY: |
1392 | case elfcpp::R_X86_64_GLOB_DAT: | |
1393 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1394 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1395 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1396 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1397 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1398 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1399 | gold_error(_("%s: unexpected reloc %u in object file"), |
1400 | object->name().c_str(), r_type); | |
2e30d253 | 1401 | break; |
2e30d253 | 1402 | |
d61c17ea | 1403 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1404 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1405 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1406 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1407 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1408 | case elfcpp::R_X86_64_DTPOFF32: |
1409 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1410 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1411 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1412 | { |
1413 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1414 | const tls::Tls_optimization optimized_type |
1415 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1416 | switch (r_type) |
1417 | { | |
56622147 | 1418 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1419 | if (optimized_type == tls::TLSOPT_NONE) |
1420 | { | |
1421 | // Create a pair of GOT entries for the module index and | |
1422 | // dtv-relative offset. | |
1423 | Output_data_got<64, false>* got | |
1424 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1425 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1426 | target->rela_dyn_section(layout), | |
1427 | elfcpp::R_X86_64_DTPMOD64, | |
1428 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1429 | } |
1430 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1431 | { | |
1432 | // Create a GOT entry for the tp-relative offset. | |
1433 | Output_data_got<64, false>* got | |
1434 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1435 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1436 | target->rela_dyn_section(layout), |
1437 | elfcpp::R_X86_64_TPOFF64); | |
1438 | } | |
1439 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1440 | unsupported_reloc_global(object, r_type, gsym); | |
1441 | break; | |
1442 | ||
56622147 | 1443 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1444 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1445 | if (optimized_type == tls::TLSOPT_NONE) |
1446 | { | |
1447 | // Create reserved PLT and GOT entries for the resolver. | |
1448 | target->reserve_tlsdesc_entries(symtab, layout); | |
1449 | ||
1450 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1451 | Output_data_got<64, false>* got | |
1452 | = target->got_section(symtab, layout); | |
1453 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1454 | target->rela_dyn_section(layout), | |
1455 | elfcpp::R_X86_64_TLSDESC, 0); | |
1456 | } | |
1457 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1458 | { | |
1459 | // Create a GOT entry for the tp-relative offset. | |
1460 | Output_data_got<64, false>* got | |
1461 | = target->got_section(symtab, layout); | |
1462 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1463 | target->rela_dyn_section(layout), | |
1464 | elfcpp::R_X86_64_TPOFF64); | |
1465 | } | |
1466 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1467 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1468 | break; |
1469 | ||
c2b45e22 CC |
1470 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1471 | break; | |
1472 | ||
e041f13d | 1473 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1474 | if (optimized_type == tls::TLSOPT_NONE) |
1475 | { | |
1476 | // Create a GOT entry for the module index. | |
31d60480 | 1477 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1478 | } |
1479 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1480 | unsupported_reloc_global(object, r_type, gsym); | |
1481 | break; | |
1482 | ||
0ffd9845 ILT |
1483 | case elfcpp::R_X86_64_DTPOFF32: |
1484 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1485 | break; |
1486 | ||
56622147 | 1487 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1488 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1489 | if (optimized_type == tls::TLSOPT_NONE) |
1490 | { | |
1491 | // Create a GOT entry for the tp-relative offset. | |
1492 | Output_data_got<64, false>* got | |
1493 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1494 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1495 | target->rela_dyn_section(layout), |
1496 | elfcpp::R_X86_64_TPOFF64); | |
1497 | } | |
1498 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1499 | unsupported_reloc_global(object, r_type, gsym); |
1500 | break; | |
0ffd9845 | 1501 | |
56622147 | 1502 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1503 | layout->set_has_static_tls(); |
8851ecca | 1504 | if (parameters->options().shared()) |
7bf1f802 | 1505 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1506 | break; |
e041f13d ILT |
1507 | |
1508 | default: | |
1509 | gold_unreachable(); | |
2e30d253 ILT |
1510 | } |
1511 | } | |
1512 | break; | |
fdc2f80f ILT |
1513 | |
1514 | case elfcpp::R_X86_64_SIZE32: | |
1515 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1516 | default: |
75f2446e | 1517 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1518 | object->name().c_str(), r_type, |
1519 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1520 | break; |
1521 | } | |
1522 | } | |
1523 | ||
1524 | // Scan relocations for a section. | |
1525 | ||
1526 | void | |
1527 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1528 | Symbol_table* symtab, |
1529 | Layout* layout, | |
1530 | Sized_relobj<64, false>* object, | |
1531 | unsigned int data_shndx, | |
1532 | unsigned int sh_type, | |
1533 | const unsigned char* prelocs, | |
1534 | size_t reloc_count, | |
730cdc88 ILT |
1535 | Output_section* output_section, |
1536 | bool needs_special_offset_handling, | |
d61c17ea | 1537 | size_t local_symbol_count, |
730cdc88 | 1538 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1539 | { |
1540 | if (sh_type == elfcpp::SHT_REL) | |
1541 | { | |
75f2446e ILT |
1542 | gold_error(_("%s: unsupported REL reloc section"), |
1543 | object->name().c_str()); | |
1544 | return; | |
2e30d253 ILT |
1545 | } |
1546 | ||
1547 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1548 | Target_x86_64::Scan>( | |
1549 | options, | |
1550 | symtab, | |
1551 | layout, | |
1552 | this, | |
1553 | object, | |
1554 | data_shndx, | |
1555 | prelocs, | |
1556 | reloc_count, | |
730cdc88 ILT |
1557 | output_section, |
1558 | needs_special_offset_handling, | |
2e30d253 | 1559 | local_symbol_count, |
730cdc88 | 1560 | plocal_symbols); |
2e30d253 ILT |
1561 | } |
1562 | ||
1563 | // Finalize the sections. | |
1564 | ||
1565 | void | |
1566 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1567 | { | |
1568 | // Fill in some more dynamic tags. | |
1569 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1570 | if (odyn != NULL) | |
1571 | { | |
1572 | if (this->got_plt_ != NULL) | |
1573 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1574 | ||
1575 | if (this->plt_ != NULL) | |
1576 | { | |
1577 | const Output_data* od = this->plt_->rel_plt(); | |
1578 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1579 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1580 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1581 | if (this->plt_->has_tlsdesc_entry()) |
1582 | { | |
1583 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1584 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1585 | this->got_->finalize_data_size(); | |
1586 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1587 | this->plt_, plt_offset); | |
1588 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1589 | this->got_, got_offset); | |
1590 | } | |
2e30d253 ILT |
1591 | } |
1592 | ||
0ffd9845 | 1593 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1594 | { |
0ffd9845 | 1595 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1596 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1597 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1598 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1599 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1600 | } |
1601 | ||
8851ecca | 1602 | if (!parameters->options().shared()) |
2e30d253 ILT |
1603 | { |
1604 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1605 | // linker at run time, and used by the debugger. | |
1606 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1607 | } | |
1608 | } | |
1609 | ||
1610 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1611 | // relocs. | |
12c0daef ILT |
1612 | if (this->copy_relocs_.any_saved_relocs()) |
1613 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1614 | } |
1615 | ||
1616 | // Perform a relocation. | |
1617 | ||
1618 | inline bool | |
1619 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1620 | Target_x86_64* target, | |
1621 | size_t relnum, | |
0ffd9845 | 1622 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1623 | unsigned int r_type, |
1624 | const Sized_symbol<64>* gsym, | |
1625 | const Symbol_value<64>* psymval, | |
1626 | unsigned char* view, | |
1627 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1628 | section_size_type view_size) |
2e30d253 ILT |
1629 | { |
1630 | if (this->skip_call_tls_get_addr_) | |
1631 | { | |
1632 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1633 | || gsym == NULL | |
0ffd9845 | 1634 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1635 | { |
75f2446e ILT |
1636 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1637 | _("missing expected TLS relocation")); | |
1638 | } | |
1639 | else | |
1640 | { | |
1641 | this->skip_call_tls_get_addr_ = false; | |
1642 | return false; | |
2e30d253 | 1643 | } |
2e30d253 ILT |
1644 | } |
1645 | ||
1646 | // Pick the value to use for symbols defined in shared objects. | |
1647 | Symbol_value<64> symval; | |
96f2030e ILT |
1648 | if (gsym != NULL |
1649 | && (gsym->is_from_dynobj() | |
8851ecca | 1650 | || (parameters->options().shared() |
8fc19601 | 1651 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
96f2030e | 1652 | && gsym->has_plt_offset()) |
2e30d253 ILT |
1653 | { |
1654 | symval.set_output_value(target->plt_section()->address() | |
1655 | + gsym->plt_offset()); | |
1656 | psymval = &symval; | |
1657 | } | |
1658 | ||
1659 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1660 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1661 | ||
1662 | // Get the GOT offset if needed. | |
96f2030e ILT |
1663 | // The GOT pointer points to the end of the GOT section. |
1664 | // We need to subtract the size of the GOT section to get | |
1665 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1666 | bool have_got_offset = false; |
1667 | unsigned int got_offset = 0; | |
1668 | switch (r_type) | |
1669 | { | |
1670 | case elfcpp::R_X86_64_GOT32: | |
1671 | case elfcpp::R_X86_64_GOT64: | |
1672 | case elfcpp::R_X86_64_GOTPLT64: | |
1673 | case elfcpp::R_X86_64_GOTPCREL: | |
1674 | case elfcpp::R_X86_64_GOTPCREL64: | |
1675 | if (gsym != NULL) | |
1676 | { | |
0a65a3a7 CC |
1677 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1678 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1679 | } |
1680 | else | |
1681 | { | |
1682 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1683 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1684 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1685 | - target->got_size()); | |
0ffd9845 ILT |
1686 | } |
1687 | have_got_offset = true; | |
1688 | break; | |
1689 | ||
1690 | default: | |
1691 | break; | |
1692 | } | |
2e30d253 ILT |
1693 | |
1694 | switch (r_type) | |
1695 | { | |
1696 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1697 | case elfcpp::R_386_GNU_VTINHERIT: |
1698 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1699 | break; |
1700 | ||
1701 | case elfcpp::R_X86_64_64: | |
1702 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1703 | break; | |
1704 | ||
1705 | case elfcpp::R_X86_64_PC64: | |
1706 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1707 | address); | |
1708 | break; | |
1709 | ||
1710 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1711 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1712 | // uint64_t x = value + addend; | |
1713 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1714 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1715 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1716 | break; | |
1717 | ||
1718 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1719 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1720 | // int64_t x = value + addend; // note this quantity is signed! | |
1721 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1722 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1723 | break; | |
1724 | ||
1725 | case elfcpp::R_X86_64_PC32: | |
1726 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1727 | address); | |
1728 | break; | |
1729 | ||
1730 | case elfcpp::R_X86_64_16: | |
1731 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1732 | break; | |
1733 | ||
1734 | case elfcpp::R_X86_64_PC16: | |
1735 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1736 | address); | |
1737 | break; | |
1738 | ||
1739 | case elfcpp::R_X86_64_8: | |
1740 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1741 | break; | |
1742 | ||
1743 | case elfcpp::R_X86_64_PC8: | |
1744 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1745 | address); | |
1746 | break; | |
1747 | ||
1748 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1749 | gold_assert(gsym == NULL |
1750 | || gsym->has_plt_offset() | |
99f8faca ILT |
1751 | || gsym->final_value_is_known() |
1752 | || (gsym->is_defined() | |
1753 | && !gsym->is_from_dynobj() | |
1754 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1755 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1756 | // behaves differently because psymval was set to point to | |
1757 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1758 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1759 | address); | |
1760 | break; | |
1761 | ||
ee9e9e86 ILT |
1762 | case elfcpp::R_X86_64_PLTOFF64: |
1763 | { | |
1764 | gold_assert(gsym); | |
1765 | gold_assert(gsym->has_plt_offset() | |
1766 | || gsym->final_value_is_known()); | |
1767 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1768 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1769 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1770 | addend - got_address); | |
ee9e9e86 ILT |
1771 | } |
1772 | ||
2e30d253 | 1773 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1774 | gold_assert(have_got_offset); |
1775 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1776 | break; |
1777 | ||
e822f2b1 ILT |
1778 | case elfcpp::R_X86_64_GOTPC32: |
1779 | { | |
1780 | gold_assert(gsym); | |
1781 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1782 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1783 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1784 | } | |
1785 | break; | |
1786 | ||
1787 | case elfcpp::R_X86_64_GOT64: | |
1788 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1789 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1790 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1791 | gold_assert(have_got_offset); |
1792 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1793 | break; |
1794 | ||
1795 | case elfcpp::R_X86_64_GOTPC64: | |
1796 | { | |
1797 | gold_assert(gsym); | |
1798 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1799 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1800 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1801 | } | |
1802 | break; | |
1803 | ||
2e30d253 ILT |
1804 | case elfcpp::R_X86_64_GOTOFF64: |
1805 | { | |
1806 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1807 | value = (psymval->value(object, 0) | |
96f2030e | 1808 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1809 | Relocate_functions<64, false>::rela64(view, value, addend); |
1810 | } | |
1811 | break; | |
1812 | ||
1813 | case elfcpp::R_X86_64_GOTPCREL: | |
1814 | { | |
0ffd9845 ILT |
1815 | gold_assert(have_got_offset); |
1816 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1817 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1818 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1819 | } |
1820 | break; | |
1821 | ||
e822f2b1 ILT |
1822 | case elfcpp::R_X86_64_GOTPCREL64: |
1823 | { | |
0ffd9845 ILT |
1824 | gold_assert(have_got_offset); |
1825 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1826 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1827 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1828 | } |
1829 | break; | |
1830 | ||
2e30d253 ILT |
1831 | case elfcpp::R_X86_64_COPY: |
1832 | case elfcpp::R_X86_64_GLOB_DAT: | |
1833 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1834 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1835 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1836 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1837 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1838 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1839 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1840 | _("unexpected reloc %u in object file"), | |
1841 | r_type); | |
2e30d253 ILT |
1842 | break; |
1843 | ||
d61c17ea | 1844 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1845 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1846 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1847 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1848 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1849 | case elfcpp::R_X86_64_DTPOFF32: |
1850 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1851 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1852 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1853 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1854 | view, address, view_size); | |
2e30d253 | 1855 | break; |
2e30d253 | 1856 | |
fdc2f80f ILT |
1857 | case elfcpp::R_X86_64_SIZE32: |
1858 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1859 | default: |
75f2446e ILT |
1860 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1861 | _("unsupported reloc %u"), | |
1862 | r_type); | |
2e30d253 ILT |
1863 | break; |
1864 | } | |
1865 | ||
1866 | return true; | |
1867 | } | |
1868 | ||
1869 | // Perform a TLS relocation. | |
1870 | ||
1871 | inline void | |
d61c17ea | 1872 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1873 | Target_x86_64* target, |
d61c17ea | 1874 | size_t relnum, |
72ec2876 | 1875 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1876 | unsigned int r_type, |
1877 | const Sized_symbol<64>* gsym, | |
1878 | const Symbol_value<64>* psymval, | |
1879 | unsigned char* view, | |
6a41d30b | 1880 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1881 | section_size_type view_size) |
2e30d253 | 1882 | { |
2e30d253 | 1883 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1884 | |
1885 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1886 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1887 | |
1888 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1889 | ||
1890 | const bool is_final = (gsym == NULL | |
8851ecca | 1891 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1892 | : gsym->final_value_is_known()); |
e041f13d ILT |
1893 | const tls::Tls_optimization optimized_type |
1894 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1895 | switch (r_type) |
1896 | { | |
56622147 | 1897 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
e041f13d | 1898 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1899 | { |
7bf1f802 | 1900 | gold_assert(tls_segment != NULL); |
2e30d253 | 1901 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1902 | rela, r_type, value, view, |
2e30d253 ILT |
1903 | view_size); |
1904 | break; | |
1905 | } | |
7bf1f802 ILT |
1906 | else |
1907 | { | |
c2b45e22 CC |
1908 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1909 | ? GOT_TYPE_TLS_OFFSET | |
1910 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
1911 | unsigned int got_offset; |
1912 | if (gsym != NULL) | |
1913 | { | |
c2b45e22 CC |
1914 | gold_assert(gsym->has_got_offset(got_type)); |
1915 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
1916 | } |
1917 | else | |
1918 | { | |
1919 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
1920 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1921 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
1922 | - target->got_size()); |
1923 | } | |
1924 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1925 | { | |
1926 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 1927 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 1928 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 1929 | value, view, address, view_size); |
7bf1f802 ILT |
1930 | break; |
1931 | } | |
1932 | else if (optimized_type == tls::TLSOPT_NONE) | |
1933 | { | |
1934 | // Relocate the field with the offset of the pair of GOT | |
1935 | // entries. | |
6a41d30b ILT |
1936 | value = target->got_plt_section()->address() + got_offset; |
1937 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1938 | address); | |
7bf1f802 ILT |
1939 | break; |
1940 | } | |
1941 | } | |
72ec2876 | 1942 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1943 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1944 | break; |
1945 | ||
c2b45e22 CC |
1946 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
1947 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1948 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1949 | { | |
1950 | gold_assert(tls_segment != NULL); | |
1951 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1952 | rela, r_type, value, view, | |
1953 | view_size); | |
1954 | break; | |
1955 | } | |
1956 | else | |
1957 | { | |
1958 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1959 | ? GOT_TYPE_TLS_OFFSET | |
1960 | : GOT_TYPE_TLS_DESC); | |
1961 | unsigned int got_offset; | |
1962 | if (gsym != NULL) | |
1963 | { | |
1964 | gold_assert(gsym->has_got_offset(got_type)); | |
1965 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1966 | } | |
1967 | else | |
1968 | { | |
1969 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
1970 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1971 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1972 | - target->got_size()); | |
1973 | } | |
1974 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1975 | { | |
1976 | gold_assert(tls_segment != NULL); | |
1977 | value = target->got_plt_section()->address() + got_offset; | |
1978 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
1979 | rela, r_type, value, view, address, | |
1980 | view_size); | |
1981 | break; | |
1982 | } | |
1983 | else if (optimized_type == tls::TLSOPT_NONE) | |
1984 | { | |
1985 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
1986 | { | |
1987 | // Relocate the field with the offset of the pair of GOT | |
1988 | // entries. | |
1989 | value = target->got_plt_section()->address() + got_offset; | |
1990 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1991 | address); | |
1992 | } | |
1993 | break; | |
1994 | } | |
1995 | } | |
1996 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
1997 | _("unsupported reloc %u"), r_type); | |
1998 | break; | |
1999 | ||
56622147 | 2000 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
e041f13d ILT |
2001 | if (optimized_type == tls::TLSOPT_TO_LE) |
2002 | { | |
7bf1f802 | 2003 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2004 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2005 | value, view, view_size); | |
2006 | break; | |
e041f13d | 2007 | } |
7bf1f802 ILT |
2008 | else if (optimized_type == tls::TLSOPT_NONE) |
2009 | { | |
2010 | // Relocate the field with the offset of the GOT entry for | |
2011 | // the module index. | |
2012 | unsigned int got_offset; | |
31d60480 ILT |
2013 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2014 | - target->got_size()); | |
6a41d30b ILT |
2015 | value = target->got_plt_section()->address() + got_offset; |
2016 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2017 | address); | |
7bf1f802 ILT |
2018 | break; |
2019 | } | |
72ec2876 | 2020 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2021 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2022 | break; |
0ffd9845 ILT |
2023 | |
2024 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 2025 | gold_assert(tls_segment != NULL); |
e041f13d | 2026 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
2027 | value -= tls_segment->memsz(); |
2028 | Relocate_functions<64, false>::rela32(view, value, 0); | |
0ffd9845 ILT |
2029 | break; |
2030 | ||
2031 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 2032 | gold_assert(tls_segment != NULL); |
e041f13d | 2033 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
2034 | value -= tls_segment->memsz(); |
2035 | Relocate_functions<64, false>::rela64(view, value, 0); | |
0ffd9845 | 2036 | break; |
2e30d253 | 2037 | |
56622147 ILT |
2038 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2039 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2040 | { | |
7bf1f802 | 2041 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2042 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2043 | rela, r_type, value, view, | |
2044 | view_size); | |
2045 | break; | |
2046 | } | |
7bf1f802 ILT |
2047 | else if (optimized_type == tls::TLSOPT_NONE) |
2048 | { | |
2049 | // Relocate the field with the offset of the GOT entry for | |
2050 | // the tp-relative offset of the symbol. | |
2051 | unsigned int got_offset; | |
2052 | if (gsym != NULL) | |
2053 | { | |
0a65a3a7 CC |
2054 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2055 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2056 | - target->got_size()); | |
7bf1f802 ILT |
2057 | } |
2058 | else | |
2059 | { | |
2060 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2061 | gold_assert(object->local_has_got_offset(r_sym, |
2062 | GOT_TYPE_TLS_OFFSET)); | |
2063 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2064 | - target->got_size()); |
2065 | } | |
6a41d30b ILT |
2066 | value = target->got_plt_section()->address() + got_offset; |
2067 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2068 | break; |
2069 | } | |
56622147 ILT |
2070 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2071 | _("unsupported reloc type %u"), | |
2072 | r_type); | |
2073 | break; | |
0ffd9845 | 2074 | |
56622147 | 2075 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b ILT |
2076 | value -= tls_segment->memsz(); |
2077 | Relocate_functions<64, false>::rela32(view, value, 0); | |
56622147 | 2078 | break; |
2e30d253 | 2079 | } |
2e30d253 ILT |
2080 | } |
2081 | ||
7bf1f802 ILT |
2082 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2083 | // Initial-Exec. | |
2084 | ||
2085 | inline void | |
2086 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2087 | size_t relnum, | |
c2b45e22 | 2088 | Output_segment*, |
7bf1f802 ILT |
2089 | const elfcpp::Rela<64, false>& rela, |
2090 | unsigned int, | |
2091 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2092 | unsigned char* view, | |
c2b45e22 | 2093 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2094 | section_size_type view_size) |
7bf1f802 ILT |
2095 | { |
2096 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2097 | // .word 0x6666; rex64; call __tls_get_addr | |
2098 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2099 | ||
2100 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2101 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2102 | ||
2103 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2104 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2105 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2106 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2107 | ||
2108 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2109 | ||
c2b45e22 CC |
2110 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2111 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2112 | |
2113 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2114 | // We can skip it. | |
2115 | this->skip_call_tls_get_addr_ = true; | |
2116 | } | |
2117 | ||
e041f13d | 2118 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2119 | // Local-Exec. |
2120 | ||
2121 | inline void | |
d61c17ea ILT |
2122 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2123 | size_t relnum, | |
2124 | Output_segment* tls_segment, | |
72ec2876 | 2125 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2126 | unsigned int, |
2127 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2128 | unsigned char* view, | |
fe8718a4 | 2129 | section_size_type view_size) |
2e30d253 | 2130 | { |
0ffd9845 ILT |
2131 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2132 | // .word 0x6666; rex64; call __tls_get_addr | |
2133 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2134 | |
72ec2876 ILT |
2135 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2136 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2137 | |
72ec2876 ILT |
2138 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2139 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2140 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2141 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2142 | |
0ffd9845 | 2143 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2144 | |
6a41d30b | 2145 | value -= tls_segment->memsz(); |
0ffd9845 | 2146 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2147 | |
2148 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2149 | // We can skip it. | |
2150 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2151 | } |
2152 | ||
c2b45e22 CC |
2153 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2154 | ||
2155 | inline void | |
2156 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2157 | const Relocate_info<64, false>* relinfo, | |
2158 | size_t relnum, | |
2159 | Output_segment*, | |
2160 | const elfcpp::Rela<64, false>& rela, | |
2161 | unsigned int r_type, | |
2162 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2163 | unsigned char* view, | |
2164 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2165 | section_size_type view_size) | |
2166 | { | |
2167 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2168 | { | |
2169 | // leaq foo@tlsdesc(%rip), %rax | |
2170 | // ==> movq foo@gottpoff(%rip), %rax | |
2171 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2172 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2173 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2174 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2175 | view[-2] = 0x8b; | |
2176 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2177 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2178 | } | |
2179 | else | |
2180 | { | |
2181 | // call *foo@tlscall(%rax) | |
2182 | // ==> nop; nop | |
2183 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2184 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2185 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2186 | view[0] == 0xff && view[1] == 0x10); | |
2187 | view[0] = 0x66; | |
2188 | view[1] = 0x90; | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2193 | ||
2194 | inline void | |
2195 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2196 | const Relocate_info<64, false>* relinfo, | |
2197 | size_t relnum, | |
2198 | Output_segment* tls_segment, | |
2199 | const elfcpp::Rela<64, false>& rela, | |
2200 | unsigned int r_type, | |
2201 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2202 | unsigned char* view, | |
2203 | section_size_type view_size) | |
2204 | { | |
2205 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2206 | { | |
2207 | // leaq foo@tlsdesc(%rip), %rax | |
2208 | // ==> movq foo@tpoff, %rax | |
2209 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2210 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2211 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2212 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2213 | view[-2] = 0xc7; | |
2214 | view[-1] = 0xc0; | |
2215 | value -= tls_segment->memsz(); | |
2216 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2217 | } | |
2218 | else | |
2219 | { | |
2220 | // call *foo@tlscall(%rax) | |
2221 | // ==> nop; nop | |
2222 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2223 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2224 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2225 | view[0] == 0xff && view[1] == 0x10); | |
2226 | view[0] = 0x66; | |
2227 | view[1] = 0x90; | |
2228 | } | |
2229 | } | |
2230 | ||
2e30d253 | 2231 | inline void |
72ec2876 ILT |
2232 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2233 | size_t relnum, | |
2234 | Output_segment*, | |
2235 | const elfcpp::Rela<64, false>& rela, | |
2236 | unsigned int, | |
2237 | elfcpp::Elf_types<64>::Elf_Addr, | |
2238 | unsigned char* view, | |
fe8718a4 | 2239 | section_size_type view_size) |
2e30d253 | 2240 | { |
72ec2876 ILT |
2241 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2242 | // ... leq foo@dtpoff(%rax),%reg | |
2243 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2244 | |
72ec2876 ILT |
2245 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2246 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2247 | |
72ec2876 ILT |
2248 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2249 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2250 | ||
2251 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2252 | ||
2253 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2254 | ||
2255 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2256 | // We can skip it. | |
2257 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2258 | } |
2259 | ||
56622147 ILT |
2260 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2261 | // Local-Exec. | |
2262 | ||
2263 | inline void | |
2264 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2265 | size_t relnum, | |
2266 | Output_segment* tls_segment, | |
2267 | const elfcpp::Rela<64, false>& rela, | |
2268 | unsigned int, | |
2269 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2270 | unsigned char* view, | |
fe8718a4 | 2271 | section_size_type view_size) |
56622147 ILT |
2272 | { |
2273 | // We need to examine the opcodes to figure out which instruction we | |
2274 | // are looking at. | |
2275 | ||
2276 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2277 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2278 | ||
2279 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2280 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2281 | ||
2282 | unsigned char op1 = view[-3]; | |
2283 | unsigned char op2 = view[-2]; | |
2284 | unsigned char op3 = view[-1]; | |
2285 | unsigned char reg = op3 >> 3; | |
2286 | ||
2287 | if (op2 == 0x8b) | |
2288 | { | |
2289 | // movq | |
2290 | if (op1 == 0x4c) | |
2291 | view[-3] = 0x49; | |
2292 | view[-2] = 0xc7; | |
2293 | view[-1] = 0xc0 | reg; | |
2294 | } | |
2295 | else if (reg == 4) | |
2296 | { | |
2297 | // Special handling for %rsp. | |
2298 | if (op1 == 0x4c) | |
2299 | view[-3] = 0x49; | |
2300 | view[-2] = 0x81; | |
2301 | view[-1] = 0xc0 | reg; | |
2302 | } | |
2303 | else | |
2304 | { | |
2305 | // addq | |
2306 | if (op1 == 0x4c) | |
2307 | view[-3] = 0x4d; | |
2308 | view[-2] = 0x8d; | |
2309 | view[-1] = 0x80 | reg | (reg << 3); | |
2310 | } | |
2311 | ||
6a41d30b | 2312 | value -= tls_segment->memsz(); |
56622147 ILT |
2313 | Relocate_functions<64, false>::rela32(view, value, 0); |
2314 | } | |
2315 | ||
2e30d253 ILT |
2316 | // Relocate section data. |
2317 | ||
2318 | void | |
2319 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2320 | unsigned int sh_type, |
2321 | const unsigned char* prelocs, | |
2322 | size_t reloc_count, | |
730cdc88 ILT |
2323 | Output_section* output_section, |
2324 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2325 | unsigned char* view, |
2326 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2327 | section_size_type view_size) |
2e30d253 ILT |
2328 | { |
2329 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2330 | ||
2331 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2332 | Target_x86_64::Relocate>( | |
2333 | relinfo, | |
2334 | this, | |
2335 | prelocs, | |
2336 | reloc_count, | |
730cdc88 ILT |
2337 | output_section, |
2338 | needs_special_offset_handling, | |
2e30d253 ILT |
2339 | view, |
2340 | address, | |
2341 | view_size); | |
2342 | } | |
2343 | ||
6a74a719 ILT |
2344 | // Return the size of a relocation while scanning during a relocatable |
2345 | // link. | |
2346 | ||
2347 | unsigned int | |
2348 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2349 | unsigned int r_type, | |
2350 | Relobj* object) | |
2351 | { | |
2352 | switch (r_type) | |
2353 | { | |
2354 | case elfcpp::R_X86_64_NONE: | |
2355 | case elfcpp::R_386_GNU_VTINHERIT: | |
2356 | case elfcpp::R_386_GNU_VTENTRY: | |
2357 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2358 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2359 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2360 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2361 | case elfcpp::R_X86_64_DTPOFF32: | |
2362 | case elfcpp::R_X86_64_DTPOFF64: | |
2363 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2364 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2365 | return 0; | |
2366 | ||
2367 | case elfcpp::R_X86_64_64: | |
2368 | case elfcpp::R_X86_64_PC64: | |
2369 | case elfcpp::R_X86_64_GOTOFF64: | |
2370 | case elfcpp::R_X86_64_GOTPC64: | |
2371 | case elfcpp::R_X86_64_PLTOFF64: | |
2372 | case elfcpp::R_X86_64_GOT64: | |
2373 | case elfcpp::R_X86_64_GOTPCREL64: | |
2374 | case elfcpp::R_X86_64_GOTPCREL: | |
2375 | case elfcpp::R_X86_64_GOTPLT64: | |
2376 | return 8; | |
2377 | ||
2378 | case elfcpp::R_X86_64_32: | |
2379 | case elfcpp::R_X86_64_32S: | |
2380 | case elfcpp::R_X86_64_PC32: | |
2381 | case elfcpp::R_X86_64_PLT32: | |
2382 | case elfcpp::R_X86_64_GOTPC32: | |
2383 | case elfcpp::R_X86_64_GOT32: | |
2384 | return 4; | |
2385 | ||
2386 | case elfcpp::R_X86_64_16: | |
2387 | case elfcpp::R_X86_64_PC16: | |
2388 | return 2; | |
2389 | ||
2390 | case elfcpp::R_X86_64_8: | |
2391 | case elfcpp::R_X86_64_PC8: | |
2392 | return 1; | |
2393 | ||
2394 | case elfcpp::R_X86_64_COPY: | |
2395 | case elfcpp::R_X86_64_GLOB_DAT: | |
2396 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2397 | case elfcpp::R_X86_64_RELATIVE: | |
2398 | // These are outstanding tls relocs, which are unexpected when linking | |
2399 | case elfcpp::R_X86_64_TPOFF64: | |
2400 | case elfcpp::R_X86_64_DTPMOD64: | |
2401 | case elfcpp::R_X86_64_TLSDESC: | |
2402 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2403 | return 0; | |
2404 | ||
2405 | case elfcpp::R_X86_64_SIZE32: | |
2406 | case elfcpp::R_X86_64_SIZE64: | |
2407 | default: | |
2408 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2409 | return 0; | |
2410 | } | |
2411 | } | |
2412 | ||
2413 | // Scan the relocs during a relocatable link. | |
2414 | ||
2415 | void | |
2416 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2417 | Symbol_table* symtab, | |
2418 | Layout* layout, | |
2419 | Sized_relobj<64, false>* object, | |
2420 | unsigned int data_shndx, | |
2421 | unsigned int sh_type, | |
2422 | const unsigned char* prelocs, | |
2423 | size_t reloc_count, | |
2424 | Output_section* output_section, | |
2425 | bool needs_special_offset_handling, | |
2426 | size_t local_symbol_count, | |
2427 | const unsigned char* plocal_symbols, | |
2428 | Relocatable_relocs* rr) | |
2429 | { | |
2430 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2431 | ||
2432 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2433 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2434 | ||
7019cd25 | 2435 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2436 | Scan_relocatable_relocs>( |
2437 | options, | |
2438 | symtab, | |
2439 | layout, | |
2440 | object, | |
2441 | data_shndx, | |
2442 | prelocs, | |
2443 | reloc_count, | |
2444 | output_section, | |
2445 | needs_special_offset_handling, | |
2446 | local_symbol_count, | |
2447 | plocal_symbols, | |
2448 | rr); | |
2449 | } | |
2450 | ||
2451 | // Relocate a section during a relocatable link. | |
2452 | ||
2453 | void | |
2454 | Target_x86_64::relocate_for_relocatable( | |
2455 | const Relocate_info<64, false>* relinfo, | |
2456 | unsigned int sh_type, | |
2457 | const unsigned char* prelocs, | |
2458 | size_t reloc_count, | |
2459 | Output_section* output_section, | |
2460 | off_t offset_in_output_section, | |
2461 | const Relocatable_relocs* rr, | |
2462 | unsigned char* view, | |
2463 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2464 | section_size_type view_size, | |
2465 | unsigned char* reloc_view, | |
2466 | section_size_type reloc_view_size) | |
2467 | { | |
2468 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2469 | ||
7019cd25 | 2470 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2471 | relinfo, |
2472 | prelocs, | |
2473 | reloc_count, | |
2474 | output_section, | |
2475 | offset_in_output_section, | |
2476 | rr, | |
2477 | view, | |
2478 | view_address, | |
2479 | view_size, | |
2480 | reloc_view, | |
2481 | reloc_view_size); | |
2482 | } | |
2483 | ||
4fb6c25d ILT |
2484 | // Return the value to use for a dynamic which requires special |
2485 | // treatment. This is how we support equality comparisons of function | |
2486 | // pointers across shared library boundaries, as described in the | |
2487 | // processor specific ABI supplement. | |
2488 | ||
2489 | uint64_t | |
2490 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2491 | { | |
2492 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2493 | return this->plt_section()->address() + gsym->plt_offset(); | |
2494 | } | |
2495 | ||
2e30d253 ILT |
2496 | // Return a string used to fill a code section with nops to take up |
2497 | // the specified length. | |
2498 | ||
2499 | std::string | |
8851ecca | 2500 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2501 | { |
2502 | if (length >= 16) | |
2503 | { | |
2504 | // Build a jmpq instruction to skip over the bytes. | |
2505 | unsigned char jmp[5]; | |
2506 | jmp[0] = 0xe9; | |
04bf7072 | 2507 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2508 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2509 | + std::string(length - 5, '\0')); | |
2510 | } | |
2511 | ||
2512 | // Nop sequences of various lengths. | |
2513 | const char nop1[1] = { 0x90 }; // nop | |
2514 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2515 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2516 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2517 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2518 | 0x00 }; // leal 0(%esi,1),%esi | |
2519 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2520 | 0x00, 0x00 }; | |
2521 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2522 | 0x00, 0x00, 0x00 }; | |
2523 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2524 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2525 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2526 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2527 | 0x00 }; | |
2528 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2529 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2530 | 0x00, 0x00 }; | |
2531 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2532 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2533 | 0x00, 0x00, 0x00 }; | |
2534 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2535 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2536 | 0x00, 0x00, 0x00, 0x00 }; | |
2537 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2538 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2539 | 0x27, 0x00, 0x00, 0x00, | |
2540 | 0x00 }; | |
2541 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2542 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2543 | 0xbc, 0x27, 0x00, 0x00, | |
2544 | 0x00, 0x00 }; | |
2545 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2546 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2547 | 0x90, 0x90, 0x90, 0x90, | |
2548 | 0x90, 0x90, 0x90 }; | |
2549 | ||
2550 | const char* nops[16] = { | |
2551 | NULL, | |
2552 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2553 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2554 | }; | |
2555 | ||
2556 | return std::string(nops[length], length); | |
2557 | } | |
2558 | ||
2559 | // The selector for x86_64 object files. | |
2560 | ||
2561 | class Target_selector_x86_64 : public Target_selector | |
2562 | { | |
2563 | public: | |
2564 | Target_selector_x86_64() | |
e96caa79 | 2565 | : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64") |
2e30d253 ILT |
2566 | { } |
2567 | ||
2568 | Target* | |
e96caa79 ILT |
2569 | do_instantiate_target() |
2570 | { return new Target_x86_64(); } | |
2e30d253 ILT |
2571 | }; |
2572 | ||
2e30d253 ILT |
2573 | Target_selector_x86_64 target_selector_x86_64; |
2574 | ||
2575 | } // End anonymous namespace. |