Commit | Line | Data |
---|---|---|
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() | |
497897f9 | 200 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
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_; | |
497897f9 ILT |
291 | |
292 | // This is set if we see a relocation which could load the address | |
293 | // of the TLS block. Whether we see such a relocation determines | |
294 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
295 | // in debugging sections. | |
296 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
297 | }; |
298 | ||
6a74a719 ILT |
299 | // A class which returns the size required for a relocation type, |
300 | // used while scanning relocs during a relocatable link. | |
301 | class Relocatable_size_for_reloc | |
302 | { | |
303 | public: | |
304 | unsigned int | |
305 | get_size_for_reloc(unsigned int, Relobj*); | |
306 | }; | |
307 | ||
2e30d253 ILT |
308 | // Adjust TLS relocation type based on the options and whether this |
309 | // is a local symbol. | |
e041f13d | 310 | static tls::Tls_optimization |
2e30d253 ILT |
311 | optimize_tls_reloc(bool is_final, int r_type); |
312 | ||
313 | // Get the GOT section, creating it if necessary. | |
314 | Output_data_got<64, false>* | |
315 | got_section(Symbol_table*, Layout*); | |
316 | ||
96f2030e ILT |
317 | // Get the GOT PLT section. |
318 | Output_data_space* | |
319 | got_plt_section() const | |
320 | { | |
321 | gold_assert(this->got_plt_ != NULL); | |
322 | return this->got_plt_; | |
323 | } | |
324 | ||
c2b45e22 CC |
325 | // Create the PLT section. |
326 | void | |
327 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
328 | ||
2e30d253 ILT |
329 | // Create a PLT entry for a global symbol. |
330 | void | |
331 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
332 | ||
edfbb029 CC |
333 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
334 | void | |
335 | define_tls_base_symbol(Symbol_table*, Layout*); | |
336 | ||
c2b45e22 CC |
337 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
338 | void | |
339 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
340 | ||
31d60480 ILT |
341 | // Create a GOT entry for the TLS module index. |
342 | unsigned int | |
343 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
344 | Sized_relobj<64, false>* object); | |
345 | ||
2e30d253 ILT |
346 | // Get the PLT section. |
347 | Output_data_plt_x86_64* | |
348 | plt_section() const | |
349 | { | |
350 | gold_assert(this->plt_ != NULL); | |
351 | return this->plt_; | |
352 | } | |
353 | ||
354 | // Get the dynamic reloc section, creating it if necessary. | |
355 | Reloc_section* | |
0ffd9845 | 356 | rela_dyn_section(Layout*); |
2e30d253 | 357 | |
d61c6bd4 ILT |
358 | // Return true if the symbol may need a COPY relocation. |
359 | // References from an executable object to non-function symbols | |
360 | // defined in a dynamic object may need a COPY relocation. | |
361 | bool | |
362 | may_need_copy_reloc(Symbol* gsym) | |
363 | { | |
8851ecca | 364 | return (!parameters->options().shared() |
d61c6bd4 ILT |
365 | && gsym->is_from_dynobj() |
366 | && gsym->type() != elfcpp::STT_FUNC); | |
367 | } | |
368 | ||
12c0daef | 369 | // Add a potential copy relocation. |
2e30d253 | 370 | void |
12c0daef ILT |
371 | copy_reloc(Symbol_table* symtab, Layout* layout, Relobj* object, |
372 | unsigned int shndx, Output_section* output_section, | |
373 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
374 | { | |
375 | this->copy_relocs_.copy_reloc(symtab, layout, | |
376 | symtab->get_sized_symbol<64>(sym), | |
377 | object, shndx, output_section, | |
378 | reloc, this->rela_dyn_section(layout)); | |
379 | } | |
2e30d253 ILT |
380 | |
381 | // Information about this specific target which we pass to the | |
382 | // general Target structure. | |
383 | static const Target::Target_info x86_64_info; | |
384 | ||
0a65a3a7 CC |
385 | enum Got_type |
386 | { | |
387 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
388 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
389 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
390 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
391 | }; | |
392 | ||
2e30d253 ILT |
393 | // The GOT section. |
394 | Output_data_got<64, false>* got_; | |
395 | // The PLT section. | |
396 | Output_data_plt_x86_64* plt_; | |
397 | // The GOT PLT section. | |
398 | Output_data_space* got_plt_; | |
399 | // The dynamic reloc section. | |
0ffd9845 | 400 | Reloc_section* rela_dyn_; |
2e30d253 | 401 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 402 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
403 | // Space for variables copied with a COPY reloc. |
404 | Output_data_space* dynbss_; | |
c2b45e22 | 405 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 406 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
407 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
408 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
409 | }; |
410 | ||
411 | const Target::Target_info Target_x86_64::x86_64_info = | |
412 | { | |
413 | 64, // size | |
414 | false, // is_big_endian | |
415 | elfcpp::EM_X86_64, // machine_code | |
416 | false, // has_make_symbol | |
417 | false, // has_resolve | |
418 | true, // has_code_fill | |
35cdfc9a | 419 | true, // is_default_stack_executable |
0864d551 | 420 | '\0', // wrap_char |
2e30d253 | 421 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 422 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
423 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
424 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
425 | }; |
426 | ||
427 | // Get the GOT section, creating it if necessary. | |
428 | ||
429 | Output_data_got<64, false>* | |
430 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
431 | { | |
432 | if (this->got_ == NULL) | |
433 | { | |
434 | gold_assert(symtab != NULL && layout != NULL); | |
435 | ||
436 | this->got_ = new Output_data_got<64, false>(); | |
437 | ||
438 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
439 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
440 | this->got_); | |
441 | ||
442 | // The old GNU linker creates a .got.plt section. We just | |
443 | // create another set of data in the .got section. Note that we | |
444 | // always create a PLT if we create a GOT, although the PLT | |
445 | // might be empty. | |
2e30d253 ILT |
446 | this->got_plt_ = new Output_data_space(8); |
447 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
448 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
449 | this->got_plt_); | |
450 | ||
451 | // The first three entries are reserved. | |
27bc2bce | 452 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
453 | |
454 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 455 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
456 | this->got_plt_, |
457 | 0, 0, elfcpp::STT_OBJECT, | |
458 | elfcpp::STB_LOCAL, | |
459 | elfcpp::STV_HIDDEN, 0, | |
460 | false, false); | |
461 | } | |
462 | ||
463 | return this->got_; | |
464 | } | |
465 | ||
466 | // Get the dynamic reloc section, creating it if necessary. | |
467 | ||
468 | Target_x86_64::Reloc_section* | |
0ffd9845 | 469 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 470 | { |
0ffd9845 | 471 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
472 | { |
473 | gold_assert(layout != NULL); | |
d98bc257 | 474 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 475 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 476 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 477 | } |
0ffd9845 | 478 | return this->rela_dyn_; |
2e30d253 ILT |
479 | } |
480 | ||
481 | // A class to handle the PLT data. | |
482 | ||
483 | class Output_data_plt_x86_64 : public Output_section_data | |
484 | { | |
485 | public: | |
486 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
487 | ||
c2b45e22 CC |
488 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
489 | Output_data_space*); | |
2e30d253 ILT |
490 | |
491 | // Add an entry to the PLT. | |
492 | void | |
493 | add_entry(Symbol* gsym); | |
494 | ||
c2b45e22 CC |
495 | // Add the reserved TLSDESC_PLT entry to the PLT. |
496 | void | |
497 | reserve_tlsdesc_entry(unsigned int got_offset) | |
498 | { this->tlsdesc_got_offset_ = got_offset; } | |
499 | ||
500 | // Return true if a TLSDESC_PLT entry has been reserved. | |
501 | bool | |
502 | has_tlsdesc_entry() const | |
503 | { return this->tlsdesc_got_offset_ != -1U; } | |
504 | ||
505 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
506 | unsigned int | |
507 | get_tlsdesc_got_offset() const | |
508 | { return this->tlsdesc_got_offset_; } | |
509 | ||
510 | // Return the offset of the reserved TLSDESC_PLT entry. | |
511 | unsigned int | |
512 | get_tlsdesc_plt_offset() const | |
513 | { return (this->count_ + 1) * plt_entry_size; } | |
514 | ||
2e30d253 ILT |
515 | // Return the .rel.plt section data. |
516 | const Reloc_section* | |
517 | rel_plt() const | |
518 | { return this->rel_; } | |
519 | ||
520 | protected: | |
521 | void | |
522 | do_adjust_output_section(Output_section* os); | |
523 | ||
524 | private: | |
525 | // The size of an entry in the PLT. | |
526 | static const int plt_entry_size = 16; | |
527 | ||
528 | // The first entry in the PLT. | |
529 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
530 | // procedure linkage table for both programs and shared objects." | |
531 | static unsigned char first_plt_entry[plt_entry_size]; | |
532 | ||
533 | // Other entries in the PLT for an executable. | |
534 | static unsigned char plt_entry[plt_entry_size]; | |
535 | ||
c2b45e22 CC |
536 | // The reserved TLSDESC entry in the PLT for an executable. |
537 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
538 | ||
2e30d253 ILT |
539 | // Set the final size. |
540 | void | |
c2b45e22 | 541 | set_final_data_size(); |
2e30d253 ILT |
542 | |
543 | // Write out the PLT data. | |
544 | void | |
545 | do_write(Output_file*); | |
546 | ||
547 | // The reloc section. | |
548 | Reloc_section* rel_; | |
c2b45e22 CC |
549 | // The .got section. |
550 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
551 | // The .got.plt section. |
552 | Output_data_space* got_plt_; | |
553 | // The number of PLT entries. | |
554 | unsigned int count_; | |
c2b45e22 CC |
555 | // Offset of the reserved TLSDESC_GOT entry when needed. |
556 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
557 | }; |
558 | ||
559 | // Create the PLT section. The ordinary .got section is an argument, | |
560 | // since we need to refer to the start. We also create our own .got | |
561 | // section just for PLT entries. | |
562 | ||
563 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 564 | Output_data_got<64, false>* got, |
2e30d253 | 565 | Output_data_space* got_plt) |
c2b45e22 CC |
566 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
567 | tlsdesc_got_offset_(-1U) | |
2e30d253 | 568 | { |
d98bc257 | 569 | this->rel_ = new Reloc_section(false); |
2e30d253 ILT |
570 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
571 | elfcpp::SHF_ALLOC, this->rel_); | |
572 | } | |
573 | ||
574 | void | |
575 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
576 | { | |
577 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
578 | // linker, and so do we. | |
579 | os->set_entsize(4); | |
580 | } | |
581 | ||
582 | // Add an entry to the PLT. | |
583 | ||
584 | void | |
585 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
586 | { | |
587 | gold_assert(!gsym->has_plt_offset()); | |
588 | ||
589 | // Note that when setting the PLT offset we skip the initial | |
590 | // reserved PLT entry. | |
591 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
592 | ||
593 | ++this->count_; | |
594 | ||
fe8718a4 | 595 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
596 | |
597 | // Every PLT entry needs a GOT entry which points back to the PLT | |
598 | // entry (this will be changed by the dynamic linker, normally | |
599 | // lazily when the function is called). | |
27bc2bce | 600 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
601 | |
602 | // Every PLT entry needs a reloc. | |
603 | gsym->set_needs_dynsym_entry(); | |
604 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
605 | got_offset, 0); | |
606 | ||
607 | // Note that we don't need to save the symbol. The contents of the | |
608 | // PLT are independent of which symbols are used. The symbols only | |
609 | // appear in the relocations. | |
610 | } | |
611 | ||
c2b45e22 CC |
612 | // Set the final size. |
613 | void | |
614 | Output_data_plt_x86_64::set_final_data_size() | |
615 | { | |
616 | unsigned int count = this->count_; | |
617 | if (this->has_tlsdesc_entry()) | |
618 | ++count; | |
619 | this->set_data_size((count + 1) * plt_entry_size); | |
620 | } | |
621 | ||
2e30d253 ILT |
622 | // The first entry in the PLT for an executable. |
623 | ||
624 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
625 | { | |
626 | // From AMD64 ABI Draft 0.98, page 76 | |
627 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 628 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
629 | 0xff, 0x25, // jmp indirect |
630 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
631 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
632 | }; | |
633 | ||
634 | // Subsequent entries in the PLT for an executable. | |
635 | ||
636 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
637 | { | |
638 | // From AMD64 ABI Draft 0.98, page 76 | |
639 | 0xff, 0x25, // jmpq indirect | |
640 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
641 | 0x68, // pushq immediate | |
642 | 0, 0, 0, 0, // replaced with offset into relocation table | |
643 | 0xe9, // jmpq relative | |
644 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
645 | }; | |
646 | ||
c2b45e22 CC |
647 | // The reserved TLSDESC entry in the PLT for an executable. |
648 | ||
649 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
650 | { | |
651 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
652 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
653 | 0xff, 0x35, // pushq x(%rip) | |
654 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
655 | 0xff, 0x25, // jmpq *y(%rip) | |
656 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
657 | 0x0f, 0x1f, // nop | |
658 | 0x40, 0 | |
659 | }; | |
660 | ||
2e30d253 ILT |
661 | // Write out the PLT. This uses the hand-coded instructions above, |
662 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
663 | ||
664 | void | |
665 | Output_data_plt_x86_64::do_write(Output_file* of) | |
666 | { | |
667 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
668 | const section_size_type oview_size = |
669 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
670 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
671 | ||
672 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
673 | const section_size_type got_size = |
674 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
675 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
676 | got_size); | |
677 | ||
678 | unsigned char* pov = oview; | |
679 | ||
c2b45e22 | 680 | // The base address of the .plt section. |
a984ee1d | 681 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 682 | // The base address of the .got section. |
a984ee1d | 683 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
684 | // The base address of the PLT portion of the .got section, |
685 | // which is where the GOT pointer will point, and where the | |
686 | // three reserved GOT entries are located. | |
a984ee1d | 687 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
688 | |
689 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 690 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
691 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
692 | (got_address + 8 | |
693 | - (plt_address + 6))); | |
694 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
695 | (got_address + 16 | |
696 | - (plt_address + 12))); | |
2e30d253 ILT |
697 | pov += plt_entry_size; |
698 | ||
699 | unsigned char* got_pov = got_view; | |
700 | ||
701 | memset(got_pov, 0, 24); | |
702 | got_pov += 24; | |
703 | ||
704 | unsigned int plt_offset = plt_entry_size; | |
705 | unsigned int got_offset = 24; | |
706 | const unsigned int count = this->count_; | |
707 | for (unsigned int plt_index = 0; | |
708 | plt_index < count; | |
709 | ++plt_index, | |
710 | pov += plt_entry_size, | |
711 | got_pov += 8, | |
712 | plt_offset += plt_entry_size, | |
713 | got_offset += 8) | |
714 | { | |
715 | // Set and adjust the PLT entry itself. | |
716 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
717 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
718 | (got_address + got_offset | |
719 | - (plt_address + plt_offset | |
720 | + 6))); | |
2e30d253 ILT |
721 | |
722 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
723 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
724 | - (plt_offset + plt_entry_size)); | |
725 | ||
726 | // Set the entry in the GOT. | |
727 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
728 | } | |
729 | ||
c2b45e22 CC |
730 | if (this->has_tlsdesc_entry()) |
731 | { | |
732 | // Set and adjust the reserved TLSDESC PLT entry. | |
733 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
734 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
735 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
736 | (got_address + 8 | |
737 | - (plt_address + plt_offset | |
738 | + 6))); | |
739 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
740 | (got_base | |
741 | + tlsdesc_got_offset | |
742 | - (plt_address + plt_offset | |
743 | + 12))); | |
744 | pov += plt_entry_size; | |
745 | } | |
746 | ||
fe8718a4 ILT |
747 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
748 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
749 | |
750 | of->write_output_view(offset, oview_size, oview); | |
751 | of->write_output_view(got_file_offset, got_size, got_view); | |
752 | } | |
753 | ||
c2b45e22 | 754 | // Create the PLT section. |
2e30d253 ILT |
755 | |
756 | void | |
c2b45e22 | 757 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 758 | { |
2e30d253 ILT |
759 | if (this->plt_ == NULL) |
760 | { | |
761 | // Create the GOT sections first. | |
762 | this->got_section(symtab, layout); | |
763 | ||
c2b45e22 CC |
764 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
765 | this->got_plt_); | |
2e30d253 ILT |
766 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
767 | (elfcpp::SHF_ALLOC | |
768 | | elfcpp::SHF_EXECINSTR), | |
769 | this->plt_); | |
770 | } | |
c2b45e22 CC |
771 | } |
772 | ||
773 | // Create a PLT entry for a global symbol. | |
774 | ||
775 | void | |
776 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
777 | Symbol* gsym) | |
778 | { | |
779 | if (gsym->has_plt_offset()) | |
780 | return; | |
781 | ||
782 | if (this->plt_ == NULL) | |
783 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
784 | |
785 | this->plt_->add_entry(gsym); | |
786 | } | |
787 | ||
edfbb029 CC |
788 | // Define the _TLS_MODULE_BASE_ symbol at the end of the TLS segment. |
789 | ||
790 | void | |
791 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
792 | { | |
793 | if (this->tls_base_symbol_defined_) | |
794 | return; | |
795 | ||
796 | Output_segment* tls_segment = layout->tls_segment(); | |
797 | if (tls_segment != NULL) | |
798 | { | |
799 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, | |
800 | tls_segment, 0, 0, | |
801 | elfcpp::STT_TLS, | |
802 | elfcpp::STB_LOCAL, | |
803 | elfcpp::STV_HIDDEN, 0, | |
804 | Symbol::SEGMENT_END, true); | |
805 | } | |
806 | this->tls_base_symbol_defined_ = true; | |
807 | } | |
808 | ||
c2b45e22 CC |
809 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
810 | ||
811 | void | |
812 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
813 | Layout* layout) | |
814 | { | |
815 | if (this->plt_ == NULL) | |
816 | this->make_plt_section(symtab, layout); | |
817 | ||
818 | if (!this->plt_->has_tlsdesc_entry()) | |
819 | { | |
820 | // Allocate the TLSDESC_GOT entry. | |
821 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
822 | unsigned int got_offset = got->add_constant(0); | |
823 | ||
824 | // Allocate the TLSDESC_PLT entry. | |
825 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
826 | } | |
827 | } | |
828 | ||
31d60480 ILT |
829 | // Create a GOT entry for the TLS module index. |
830 | ||
831 | unsigned int | |
832 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
833 | Sized_relobj<64, false>* object) | |
834 | { | |
835 | if (this->got_mod_index_offset_ == -1U) | |
836 | { | |
837 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
838 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
839 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
840 | unsigned int got_offset = got->add_constant(0); | |
841 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
842 | got_offset, 0); | |
009a67a2 | 843 | got->add_constant(0); |
31d60480 ILT |
844 | this->got_mod_index_offset_ = got_offset; |
845 | } | |
846 | return this->got_mod_index_offset_; | |
847 | } | |
848 | ||
2e30d253 ILT |
849 | // Optimize the TLS relocation type based on what we know about the |
850 | // symbol. IS_FINAL is true if the final address of this symbol is | |
851 | // known at link time. | |
852 | ||
e041f13d | 853 | tls::Tls_optimization |
2e30d253 ILT |
854 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
855 | { | |
2e30d253 ILT |
856 | // If we are generating a shared library, then we can't do anything |
857 | // in the linker. | |
8851ecca | 858 | if (parameters->options().shared()) |
e041f13d | 859 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
860 | |
861 | switch (r_type) | |
862 | { | |
863 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
864 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
865 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
866 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
867 | // access. Since we know that we are generating an executable, |
868 | // we can convert this to Initial-Exec. If we also know that | |
869 | // this is a local symbol, we can further switch to Local-Exec. | |
870 | if (is_final) | |
e041f13d ILT |
871 | return tls::TLSOPT_TO_LE; |
872 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 873 | |
d61c17ea | 874 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
875 | // This is Local-Dynamic, which refers to a local symbol in the |
876 | // dynamic TLS block. Since we know that we generating an | |
877 | // executable, we can switch to Local-Exec. | |
e041f13d | 878 | return tls::TLSOPT_TO_LE; |
2e30d253 | 879 | |
0ffd9845 | 880 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
881 | case elfcpp::R_X86_64_DTPOFF64: |
882 | // Another Local-Dynamic reloc. | |
e041f13d | 883 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 884 | |
d61c17ea | 885 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
886 | // These are Initial-Exec relocs which get the thread offset |
887 | // from the GOT. If we know that we are linking against the | |
888 | // local symbol, we can switch to Local-Exec, which links the | |
889 | // thread offset into the instruction. | |
890 | if (is_final) | |
e041f13d ILT |
891 | return tls::TLSOPT_TO_LE; |
892 | return tls::TLSOPT_NONE; | |
2e30d253 | 893 | |
d61c17ea | 894 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
895 | // When we already have Local-Exec, there is nothing further we |
896 | // can do. | |
e041f13d | 897 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
898 | |
899 | default: | |
900 | gold_unreachable(); | |
901 | } | |
2e30d253 ILT |
902 | } |
903 | ||
e041f13d ILT |
904 | // Report an unsupported relocation against a local symbol. |
905 | ||
906 | void | |
907 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
908 | unsigned int r_type) | |
909 | { | |
75f2446e ILT |
910 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
911 | object->name().c_str(), r_type); | |
e041f13d ILT |
912 | } |
913 | ||
a036edd8 ILT |
914 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
915 | // dynamic linker does not support it, issue an error. The GNU linker | |
916 | // only issues a non-PIC error for an allocated read-only section. | |
917 | // Here we know the section is allocated, but we don't know that it is | |
918 | // read-only. But we check for all the relocation types which the | |
919 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
920 | // error even if the section is not read-only. | |
921 | ||
922 | void | |
923 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
924 | { | |
925 | switch (r_type) | |
926 | { | |
927 | // These are the relocation types supported by glibc for x86_64. | |
928 | case elfcpp::R_X86_64_RELATIVE: | |
929 | case elfcpp::R_X86_64_GLOB_DAT: | |
930 | case elfcpp::R_X86_64_JUMP_SLOT: | |
931 | case elfcpp::R_X86_64_DTPMOD64: | |
932 | case elfcpp::R_X86_64_DTPOFF64: | |
933 | case elfcpp::R_X86_64_TPOFF64: | |
934 | case elfcpp::R_X86_64_64: | |
935 | case elfcpp::R_X86_64_32: | |
936 | case elfcpp::R_X86_64_PC32: | |
937 | case elfcpp::R_X86_64_COPY: | |
938 | return; | |
939 | ||
940 | default: | |
941 | // This prevents us from issuing more than one error per reloc | |
942 | // section. But we can still wind up issuing more than one | |
943 | // error per object file. | |
944 | if (this->issued_non_pic_error_) | |
945 | return; | |
946 | object->error(_("requires unsupported dynamic reloc; " | |
947 | "recompile with -fPIC")); | |
948 | this->issued_non_pic_error_ = true; | |
949 | return; | |
950 | ||
951 | case elfcpp::R_X86_64_NONE: | |
952 | gold_unreachable(); | |
953 | } | |
954 | } | |
955 | ||
2e30d253 ILT |
956 | // Scan a relocation for a local symbol. |
957 | ||
958 | inline void | |
959 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
960 | Symbol_table* symtab, |
961 | Layout* layout, | |
962 | Target_x86_64* target, | |
963 | Sized_relobj<64, false>* object, | |
0ffd9845 | 964 | unsigned int data_shndx, |
4f4c5f80 | 965 | Output_section* output_section, |
0ffd9845 | 966 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 967 | unsigned int r_type, |
7bf1f802 | 968 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
969 | { |
970 | switch (r_type) | |
971 | { | |
972 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
973 | case elfcpp::R_386_GNU_VTINHERIT: |
974 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
975 | break; |
976 | ||
977 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 978 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
979 | // executable), we need to create a dynamic relocation for this |
980 | // location. The relocation applied at link time will apply the | |
981 | // link-time value, so we flag the location with an | |
982 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 983 | // relocate it easily. |
8851ecca | 984 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 985 | { |
e8c846c3 | 986 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 987 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
988 | rela_dyn->add_local_relative(object, r_sym, |
989 | elfcpp::R_X86_64_RELATIVE, | |
990 | output_section, data_shndx, | |
991 | reloc.get_r_offset(), | |
992 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
993 | } |
994 | break; | |
995 | ||
2e30d253 ILT |
996 | case elfcpp::R_X86_64_32: |
997 | case elfcpp::R_X86_64_32S: | |
998 | case elfcpp::R_X86_64_16: | |
999 | case elfcpp::R_X86_64_8: | |
96f2030e | 1000 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1001 | // executable), we need to create a dynamic relocation for this |
1002 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1003 | // because that is always a 64-bit relocation. | |
8851ecca | 1004 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1005 | { |
a036edd8 ILT |
1006 | this->check_non_pic(object, r_type); |
1007 | ||
96f2030e | 1008 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1009 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1010 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1011 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1012 | data_shndx, reloc.get_r_offset(), | |
1013 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1014 | else |
1015 | { | |
1016 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1017 | unsigned int shndx = lsym.get_st_shndx(); |
1018 | bool is_ordinary; | |
1019 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1020 | &is_ordinary); | |
1021 | if (!is_ordinary) | |
1022 | object->error(_("section symbol %u has bad shndx %u"), | |
1023 | r_sym, shndx); | |
1024 | else | |
1025 | rela_dyn->add_local_section(object, shndx, | |
1026 | r_type, output_section, | |
1027 | data_shndx, reloc.get_r_offset(), | |
1028 | reloc.get_r_addend()); | |
dceae3c1 | 1029 | } |
96f2030e | 1030 | } |
2e30d253 ILT |
1031 | break; |
1032 | ||
1033 | case elfcpp::R_X86_64_PC64: | |
1034 | case elfcpp::R_X86_64_PC32: | |
1035 | case elfcpp::R_X86_64_PC16: | |
1036 | case elfcpp::R_X86_64_PC8: | |
1037 | break; | |
1038 | ||
f389a824 ILT |
1039 | case elfcpp::R_X86_64_PLT32: |
1040 | // Since we know this is a local symbol, we can handle this as a | |
1041 | // PC32 reloc. | |
1042 | break; | |
1043 | ||
fdc2f80f | 1044 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1045 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1046 | case elfcpp::R_X86_64_GOTPC64: |
1047 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1048 | // We need a GOT section. |
1049 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1050 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1051 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1052 | break; |
1053 | ||
0ffd9845 ILT |
1054 | case elfcpp::R_X86_64_GOT64: |
1055 | case elfcpp::R_X86_64_GOT32: | |
1056 | case elfcpp::R_X86_64_GOTPCREL64: | |
1057 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1058 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1059 | { |
1060 | // The symbol requires a GOT entry. | |
1061 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1062 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1063 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1064 | { |
1065 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1066 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1067 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1068 | { |
1069 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1070 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1071 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1072 | rela_dyn->add_local_relative( |
1073 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1074 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1075 | else |
dceae3c1 | 1076 | { |
a036edd8 ILT |
1077 | this->check_non_pic(object, r_type); |
1078 | ||
dceae3c1 | 1079 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1080 | rela_dyn->add_local( |
1081 | object, r_sym, r_type, got, | |
1082 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1083 | } |
0ffd9845 ILT |
1084 | } |
1085 | } | |
ee9e9e86 ILT |
1086 | // For GOTPLT64, we'd normally want a PLT section, but since |
1087 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1088 | } |
1089 | break; | |
1090 | ||
2e30d253 ILT |
1091 | case elfcpp::R_X86_64_COPY: |
1092 | case elfcpp::R_X86_64_GLOB_DAT: | |
1093 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1094 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1095 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1096 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1097 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1098 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1099 | gold_error(_("%s: unexpected reloc %u in object file"), |
1100 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1101 | break; |
1102 | ||
d61c17ea | 1103 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1104 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1105 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1106 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1107 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1108 | case elfcpp::R_X86_64_DTPOFF32: |
1109 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1110 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1111 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1112 | { |
8851ecca | 1113 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1114 | const tls::Tls_optimization optimized_type |
1115 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1116 | switch (r_type) |
1117 | { | |
56622147 | 1118 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1119 | if (optimized_type == tls::TLSOPT_NONE) |
1120 | { | |
1121 | // Create a pair of GOT entries for the module index and | |
1122 | // dtv-relative offset. | |
1123 | Output_data_got<64, false>* got | |
1124 | = target->got_section(symtab, layout); | |
1125 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1126 | unsigned int shndx = lsym.get_st_shndx(); |
1127 | bool is_ordinary; | |
1128 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1129 | if (!is_ordinary) | |
1130 | object->error(_("local symbol %u has bad shndx %u"), | |
1131 | r_sym, shndx); | |
1132 | else | |
1133 | got->add_local_pair_with_rela(object, r_sym, | |
1134 | shndx, | |
1135 | GOT_TYPE_TLS_PAIR, | |
1136 | target->rela_dyn_section(layout), | |
1137 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1138 | } |
1139 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1140 | unsupported_reloc_local(object, r_type); | |
1141 | break; | |
1142 | ||
56622147 | 1143 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1144 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1145 | if (optimized_type == tls::TLSOPT_NONE) |
1146 | { | |
1147 | // Create reserved PLT and GOT entries for the resolver. | |
1148 | target->reserve_tlsdesc_entries(symtab, layout); | |
1149 | ||
1150 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1151 | Output_data_got<64, false>* got | |
1152 | = target->got_section(symtab, layout); | |
1153 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1154 | unsigned int shndx = lsym.get_st_shndx(); |
1155 | bool is_ordinary; | |
1156 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1157 | if (!is_ordinary) | |
1158 | object->error(_("local symbol %u has bad shndx %u"), | |
1159 | r_sym, shndx); | |
1160 | else | |
1161 | got->add_local_pair_with_rela(object, r_sym, | |
1162 | shndx, | |
1163 | GOT_TYPE_TLS_DESC, | |
1164 | target->rela_dyn_section(layout), | |
1165 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1166 | } |
1167 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1168 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1169 | break; |
1170 | ||
c2b45e22 CC |
1171 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1172 | break; | |
1173 | ||
e041f13d | 1174 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1175 | if (optimized_type == tls::TLSOPT_NONE) |
1176 | { | |
1177 | // Create a GOT entry for the module index. | |
31d60480 | 1178 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1179 | } |
1180 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1181 | unsupported_reloc_local(object, r_type); | |
1182 | break; | |
1183 | ||
0ffd9845 ILT |
1184 | case elfcpp::R_X86_64_DTPOFF32: |
1185 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1186 | break; |
1187 | ||
56622147 | 1188 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1189 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1190 | if (optimized_type == tls::TLSOPT_NONE) |
1191 | { | |
1192 | // Create a GOT entry for the tp-relative offset. | |
1193 | Output_data_got<64, false>* got | |
1194 | = target->got_section(symtab, layout); | |
1195 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1196 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1197 | target->rela_dyn_section(layout), |
1198 | elfcpp::R_X86_64_TPOFF64); | |
1199 | } | |
1200 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1201 | unsupported_reloc_local(object, r_type); |
1202 | break; | |
0ffd9845 | 1203 | |
56622147 | 1204 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1205 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1206 | if (output_is_shared) |
1207 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1208 | break; |
e041f13d ILT |
1209 | |
1210 | default: | |
1211 | gold_unreachable(); | |
2e30d253 ILT |
1212 | } |
1213 | } | |
1214 | break; | |
2e30d253 | 1215 | |
fdc2f80f ILT |
1216 | case elfcpp::R_X86_64_SIZE32: |
1217 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1218 | default: |
75f2446e ILT |
1219 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1220 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1221 | break; |
1222 | } | |
1223 | } | |
1224 | ||
1225 | ||
e041f13d ILT |
1226 | // Report an unsupported relocation against a global symbol. |
1227 | ||
1228 | void | |
1229 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1230 | unsigned int r_type, | |
1231 | Symbol* gsym) | |
1232 | { | |
75f2446e | 1233 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1234 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1235 | } |
1236 | ||
2e30d253 ILT |
1237 | // Scan a relocation for a global symbol. |
1238 | ||
1239 | inline void | |
12c0daef | 1240 | Target_x86_64::Scan::global(const General_options&, |
d61c17ea ILT |
1241 | Symbol_table* symtab, |
1242 | Layout* layout, | |
1243 | Target_x86_64* target, | |
1244 | Sized_relobj<64, false>* object, | |
1245 | unsigned int data_shndx, | |
4f4c5f80 | 1246 | Output_section* output_section, |
d61c17ea ILT |
1247 | const elfcpp::Rela<64, false>& reloc, |
1248 | unsigned int r_type, | |
1249 | Symbol* gsym) | |
2e30d253 ILT |
1250 | { |
1251 | switch (r_type) | |
1252 | { | |
1253 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1254 | case elfcpp::R_386_GNU_VTINHERIT: |
1255 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1256 | break; |
1257 | ||
1258 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1259 | case elfcpp::R_X86_64_32: |
1260 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1261 | case elfcpp::R_X86_64_16: |
2e30d253 | 1262 | case elfcpp::R_X86_64_8: |
96f2030e | 1263 | { |
d61c6bd4 ILT |
1264 | // Make a PLT entry if necessary. |
1265 | if (gsym->needs_plt_entry()) | |
1266 | { | |
1267 | target->make_plt_entry(symtab, layout, gsym); | |
1268 | // Since this is not a PC-relative relocation, we may be | |
1269 | // taking the address of a function. In that case we need to | |
1270 | // set the entry in the dynamic symbol table to the address of | |
1271 | // the PLT entry. | |
8851ecca | 1272 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1273 | gsym->set_needs_dynsym_value(); |
1274 | } | |
1275 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1276 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1277 | { |
1278 | if (target->may_need_copy_reloc(gsym)) | |
1279 | { | |
12c0daef | 1280 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1281 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1282 | } |
1283 | else if (r_type == elfcpp::R_X86_64_64 | |
1284 | && gsym->can_use_relative_reloc(false)) | |
1285 | { | |
1286 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1287 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1288 | output_section, object, | |
1289 | data_shndx, reloc.get_r_offset(), | |
1290 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1291 | } |
1292 | else | |
1293 | { | |
a036edd8 | 1294 | this->check_non_pic(object, r_type); |
96f2030e | 1295 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1296 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1297 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1298 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1299 | } |
1300 | } | |
1301 | } | |
1302 | break; | |
1303 | ||
1304 | case elfcpp::R_X86_64_PC64: | |
1305 | case elfcpp::R_X86_64_PC32: | |
1306 | case elfcpp::R_X86_64_PC16: | |
1307 | case elfcpp::R_X86_64_PC8: | |
1308 | { | |
1309 | // Make a PLT entry if necessary. | |
1310 | if (gsym->needs_plt_entry()) | |
1311 | target->make_plt_entry(symtab, layout, gsym); | |
1312 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1313 | int flags = Symbol::NON_PIC_REF; |
1314 | if (gsym->type() == elfcpp::STT_FUNC) | |
1315 | flags |= Symbol::FUNCTION_CALL; | |
1316 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1317 | { |
d61c6bd4 ILT |
1318 | if (target->may_need_copy_reloc(gsym)) |
1319 | { | |
12c0daef | 1320 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1321 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1322 | } |
86849f1f | 1323 | else |
d61c6bd4 | 1324 | { |
a036edd8 | 1325 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1326 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1327 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1328 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1329 | reloc.get_r_addend()); |
1330 | } | |
86849f1f | 1331 | } |
d61c6bd4 | 1332 | } |
2e30d253 ILT |
1333 | break; |
1334 | ||
ff006520 | 1335 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1336 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1337 | case elfcpp::R_X86_64_GOTPCREL64: |
1338 | case elfcpp::R_X86_64_GOTPCREL: | |
1339 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1340 | { |
1341 | // The symbol requires a GOT entry. | |
1342 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1343 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1344 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1345 | else |
1346 | { | |
2e30d253 ILT |
1347 | // If this symbol is not fully resolved, we need to add a |
1348 | // dynamic relocation for it. | |
7bf1f802 | 1349 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1350 | if (gsym->is_from_dynobj() |
1351 | || gsym->is_undefined() | |
1352 | || gsym->is_preemptible()) | |
0a65a3a7 | 1353 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1354 | elfcpp::R_X86_64_GLOB_DAT); |
1355 | else | |
2e30d253 | 1356 | { |
0a65a3a7 CC |
1357 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1358 | rela_dyn->add_global_relative( | |
1359 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1360 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1361 | } |
1362 | } | |
ee9e9e86 ILT |
1363 | // For GOTPLT64, we also need a PLT entry (but only if the |
1364 | // symbol is not fully resolved). | |
1365 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1366 | && !gsym->final_value_is_known()) | |
1367 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1368 | } |
1369 | break; | |
1370 | ||
1371 | case elfcpp::R_X86_64_PLT32: | |
1372 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1373 | // Otherwise we need a PLT entry. | |
1374 | if (gsym->final_value_is_known()) | |
1375 | break; | |
96f2030e ILT |
1376 | // If building a shared library, we can also skip the PLT entry |
1377 | // if the symbol is defined in the output file and is protected | |
1378 | // or hidden. | |
1379 | if (gsym->is_defined() | |
1380 | && !gsym->is_from_dynobj() | |
1381 | && !gsym->is_preemptible()) | |
1382 | break; | |
2e30d253 ILT |
1383 | target->make_plt_entry(symtab, layout, gsym); |
1384 | break; | |
1385 | ||
fdc2f80f | 1386 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1387 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1388 | case elfcpp::R_X86_64_GOTPC64: |
1389 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1390 | // We need a GOT section. |
1391 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1392 | // For PLTOFF64, we also need a PLT entry (but only if the |
1393 | // symbol is not fully resolved). | |
1394 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1395 | && !gsym->final_value_is_known()) | |
1396 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1397 | break; |
1398 | ||
2e30d253 ILT |
1399 | case elfcpp::R_X86_64_COPY: |
1400 | case elfcpp::R_X86_64_GLOB_DAT: | |
1401 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1402 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1403 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1404 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1405 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1406 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1407 | gold_error(_("%s: unexpected reloc %u in object file"), |
1408 | object->name().c_str(), r_type); | |
2e30d253 | 1409 | break; |
2e30d253 | 1410 | |
d61c17ea | 1411 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1412 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1413 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1414 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1415 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1416 | case elfcpp::R_X86_64_DTPOFF32: |
1417 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1418 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1419 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1420 | { |
1421 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1422 | const tls::Tls_optimization optimized_type |
1423 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1424 | switch (r_type) |
1425 | { | |
56622147 | 1426 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1427 | if (optimized_type == tls::TLSOPT_NONE) |
1428 | { | |
1429 | // Create a pair of GOT entries for the module index and | |
1430 | // dtv-relative offset. | |
1431 | Output_data_got<64, false>* got | |
1432 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1433 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1434 | target->rela_dyn_section(layout), | |
1435 | elfcpp::R_X86_64_DTPMOD64, | |
1436 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1437 | } |
1438 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1439 | { | |
1440 | // Create a GOT entry for the tp-relative offset. | |
1441 | Output_data_got<64, false>* got | |
1442 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1443 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1444 | target->rela_dyn_section(layout), |
1445 | elfcpp::R_X86_64_TPOFF64); | |
1446 | } | |
1447 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1448 | unsupported_reloc_global(object, r_type, gsym); | |
1449 | break; | |
1450 | ||
56622147 | 1451 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1452 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1453 | if (optimized_type == tls::TLSOPT_NONE) |
1454 | { | |
1455 | // Create reserved PLT and GOT entries for the resolver. | |
1456 | target->reserve_tlsdesc_entries(symtab, layout); | |
1457 | ||
1458 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1459 | Output_data_got<64, false>* got | |
1460 | = target->got_section(symtab, layout); | |
1461 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1462 | target->rela_dyn_section(layout), | |
1463 | elfcpp::R_X86_64_TLSDESC, 0); | |
1464 | } | |
1465 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1466 | { | |
1467 | // Create a GOT entry for the tp-relative offset. | |
1468 | Output_data_got<64, false>* got | |
1469 | = target->got_section(symtab, layout); | |
1470 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1471 | target->rela_dyn_section(layout), | |
1472 | elfcpp::R_X86_64_TPOFF64); | |
1473 | } | |
1474 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1475 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1476 | break; |
1477 | ||
c2b45e22 CC |
1478 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1479 | break; | |
1480 | ||
e041f13d | 1481 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1482 | if (optimized_type == tls::TLSOPT_NONE) |
1483 | { | |
1484 | // Create a GOT entry for the module index. | |
31d60480 | 1485 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1486 | } |
1487 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1488 | unsupported_reloc_global(object, r_type, gsym); | |
1489 | break; | |
1490 | ||
0ffd9845 ILT |
1491 | case elfcpp::R_X86_64_DTPOFF32: |
1492 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1493 | break; |
1494 | ||
56622147 | 1495 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1496 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1497 | if (optimized_type == tls::TLSOPT_NONE) |
1498 | { | |
1499 | // Create a GOT entry for the tp-relative offset. | |
1500 | Output_data_got<64, false>* got | |
1501 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1502 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1503 | target->rela_dyn_section(layout), |
1504 | elfcpp::R_X86_64_TPOFF64); | |
1505 | } | |
1506 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1507 | unsupported_reloc_global(object, r_type, gsym); |
1508 | break; | |
0ffd9845 | 1509 | |
56622147 | 1510 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1511 | layout->set_has_static_tls(); |
8851ecca | 1512 | if (parameters->options().shared()) |
7bf1f802 | 1513 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1514 | break; |
e041f13d ILT |
1515 | |
1516 | default: | |
1517 | gold_unreachable(); | |
2e30d253 ILT |
1518 | } |
1519 | } | |
1520 | break; | |
fdc2f80f ILT |
1521 | |
1522 | case elfcpp::R_X86_64_SIZE32: | |
1523 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1524 | default: |
75f2446e | 1525 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1526 | object->name().c_str(), r_type, |
1527 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1528 | break; |
1529 | } | |
1530 | } | |
1531 | ||
1532 | // Scan relocations for a section. | |
1533 | ||
1534 | void | |
1535 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1536 | Symbol_table* symtab, |
1537 | Layout* layout, | |
1538 | Sized_relobj<64, false>* object, | |
1539 | unsigned int data_shndx, | |
1540 | unsigned int sh_type, | |
1541 | const unsigned char* prelocs, | |
1542 | size_t reloc_count, | |
730cdc88 ILT |
1543 | Output_section* output_section, |
1544 | bool needs_special_offset_handling, | |
d61c17ea | 1545 | size_t local_symbol_count, |
730cdc88 | 1546 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1547 | { |
1548 | if (sh_type == elfcpp::SHT_REL) | |
1549 | { | |
75f2446e ILT |
1550 | gold_error(_("%s: unsupported REL reloc section"), |
1551 | object->name().c_str()); | |
1552 | return; | |
2e30d253 ILT |
1553 | } |
1554 | ||
1555 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1556 | Target_x86_64::Scan>( | |
1557 | options, | |
1558 | symtab, | |
1559 | layout, | |
1560 | this, | |
1561 | object, | |
1562 | data_shndx, | |
1563 | prelocs, | |
1564 | reloc_count, | |
730cdc88 ILT |
1565 | output_section, |
1566 | needs_special_offset_handling, | |
2e30d253 | 1567 | local_symbol_count, |
730cdc88 | 1568 | plocal_symbols); |
2e30d253 ILT |
1569 | } |
1570 | ||
1571 | // Finalize the sections. | |
1572 | ||
1573 | void | |
1574 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1575 | { | |
1576 | // Fill in some more dynamic tags. | |
1577 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1578 | if (odyn != NULL) | |
1579 | { | |
1580 | if (this->got_plt_ != NULL) | |
1581 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1582 | ||
1583 | if (this->plt_ != NULL) | |
1584 | { | |
1585 | const Output_data* od = this->plt_->rel_plt(); | |
1586 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1587 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1588 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1589 | if (this->plt_->has_tlsdesc_entry()) |
1590 | { | |
1591 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1592 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1593 | this->got_->finalize_data_size(); | |
1594 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1595 | this->plt_, plt_offset); | |
1596 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1597 | this->got_, got_offset); | |
1598 | } | |
2e30d253 ILT |
1599 | } |
1600 | ||
0ffd9845 | 1601 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1602 | { |
0ffd9845 | 1603 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1604 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1605 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1606 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1607 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1608 | } |
1609 | ||
8851ecca | 1610 | if (!parameters->options().shared()) |
2e30d253 ILT |
1611 | { |
1612 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1613 | // linker at run time, and used by the debugger. | |
1614 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1615 | } | |
1616 | } | |
1617 | ||
1618 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1619 | // relocs. | |
12c0daef ILT |
1620 | if (this->copy_relocs_.any_saved_relocs()) |
1621 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1622 | } |
1623 | ||
1624 | // Perform a relocation. | |
1625 | ||
1626 | inline bool | |
1627 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1628 | Target_x86_64* target, | |
1629 | size_t relnum, | |
0ffd9845 | 1630 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1631 | unsigned int r_type, |
1632 | const Sized_symbol<64>* gsym, | |
1633 | const Symbol_value<64>* psymval, | |
1634 | unsigned char* view, | |
1635 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1636 | section_size_type view_size) |
2e30d253 ILT |
1637 | { |
1638 | if (this->skip_call_tls_get_addr_) | |
1639 | { | |
1640 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1641 | || gsym == NULL | |
0ffd9845 | 1642 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1643 | { |
75f2446e ILT |
1644 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1645 | _("missing expected TLS relocation")); | |
1646 | } | |
1647 | else | |
1648 | { | |
1649 | this->skip_call_tls_get_addr_ = false; | |
1650 | return false; | |
2e30d253 | 1651 | } |
2e30d253 ILT |
1652 | } |
1653 | ||
1654 | // Pick the value to use for symbols defined in shared objects. | |
1655 | Symbol_value<64> symval; | |
96f2030e ILT |
1656 | if (gsym != NULL |
1657 | && (gsym->is_from_dynobj() | |
8851ecca | 1658 | || (parameters->options().shared() |
8fc19601 | 1659 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
96f2030e | 1660 | && gsym->has_plt_offset()) |
2e30d253 ILT |
1661 | { |
1662 | symval.set_output_value(target->plt_section()->address() | |
1663 | + gsym->plt_offset()); | |
1664 | psymval = &symval; | |
1665 | } | |
1666 | ||
1667 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1668 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1669 | ||
1670 | // Get the GOT offset if needed. | |
96f2030e ILT |
1671 | // The GOT pointer points to the end of the GOT section. |
1672 | // We need to subtract the size of the GOT section to get | |
1673 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1674 | bool have_got_offset = false; |
1675 | unsigned int got_offset = 0; | |
1676 | switch (r_type) | |
1677 | { | |
1678 | case elfcpp::R_X86_64_GOT32: | |
1679 | case elfcpp::R_X86_64_GOT64: | |
1680 | case elfcpp::R_X86_64_GOTPLT64: | |
1681 | case elfcpp::R_X86_64_GOTPCREL: | |
1682 | case elfcpp::R_X86_64_GOTPCREL64: | |
1683 | if (gsym != NULL) | |
1684 | { | |
0a65a3a7 CC |
1685 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1686 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1687 | } |
1688 | else | |
1689 | { | |
1690 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1691 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1692 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1693 | - target->got_size()); | |
0ffd9845 ILT |
1694 | } |
1695 | have_got_offset = true; | |
1696 | break; | |
1697 | ||
1698 | default: | |
1699 | break; | |
1700 | } | |
2e30d253 ILT |
1701 | |
1702 | switch (r_type) | |
1703 | { | |
1704 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1705 | case elfcpp::R_386_GNU_VTINHERIT: |
1706 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1707 | break; |
1708 | ||
1709 | case elfcpp::R_X86_64_64: | |
1710 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1711 | break; | |
1712 | ||
1713 | case elfcpp::R_X86_64_PC64: | |
1714 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1715 | address); | |
1716 | break; | |
1717 | ||
1718 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1719 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1720 | // uint64_t x = value + addend; | |
1721 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1722 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1723 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1724 | break; | |
1725 | ||
1726 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1727 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1728 | // int64_t x = value + addend; // note this quantity is signed! | |
1729 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1730 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1731 | break; | |
1732 | ||
1733 | case elfcpp::R_X86_64_PC32: | |
1734 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1735 | address); | |
1736 | break; | |
1737 | ||
1738 | case elfcpp::R_X86_64_16: | |
1739 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1740 | break; | |
1741 | ||
1742 | case elfcpp::R_X86_64_PC16: | |
1743 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1744 | address); | |
1745 | break; | |
1746 | ||
1747 | case elfcpp::R_X86_64_8: | |
1748 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1749 | break; | |
1750 | ||
1751 | case elfcpp::R_X86_64_PC8: | |
1752 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1753 | address); | |
1754 | break; | |
1755 | ||
1756 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1757 | gold_assert(gsym == NULL |
1758 | || gsym->has_plt_offset() | |
99f8faca ILT |
1759 | || gsym->final_value_is_known() |
1760 | || (gsym->is_defined() | |
1761 | && !gsym->is_from_dynobj() | |
1762 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1763 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1764 | // behaves differently because psymval was set to point to | |
1765 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1766 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1767 | address); | |
1768 | break; | |
1769 | ||
ee9e9e86 ILT |
1770 | case elfcpp::R_X86_64_PLTOFF64: |
1771 | { | |
1772 | gold_assert(gsym); | |
1773 | gold_assert(gsym->has_plt_offset() | |
1774 | || gsym->final_value_is_known()); | |
1775 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1776 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1777 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1778 | addend - got_address); | |
ee9e9e86 ILT |
1779 | } |
1780 | ||
2e30d253 | 1781 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1782 | gold_assert(have_got_offset); |
1783 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1784 | break; |
1785 | ||
e822f2b1 ILT |
1786 | case elfcpp::R_X86_64_GOTPC32: |
1787 | { | |
1788 | gold_assert(gsym); | |
1789 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1790 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1791 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1792 | } | |
1793 | break; | |
1794 | ||
1795 | case elfcpp::R_X86_64_GOT64: | |
1796 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1797 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1798 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1799 | gold_assert(have_got_offset); |
1800 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1801 | break; |
1802 | ||
1803 | case elfcpp::R_X86_64_GOTPC64: | |
1804 | { | |
1805 | gold_assert(gsym); | |
1806 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1807 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1808 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1809 | } | |
1810 | break; | |
1811 | ||
2e30d253 ILT |
1812 | case elfcpp::R_X86_64_GOTOFF64: |
1813 | { | |
1814 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1815 | value = (psymval->value(object, 0) | |
96f2030e | 1816 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1817 | Relocate_functions<64, false>::rela64(view, value, addend); |
1818 | } | |
1819 | break; | |
1820 | ||
1821 | case elfcpp::R_X86_64_GOTPCREL: | |
1822 | { | |
0ffd9845 ILT |
1823 | gold_assert(have_got_offset); |
1824 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1825 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1826 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1827 | } |
1828 | break; | |
1829 | ||
e822f2b1 ILT |
1830 | case elfcpp::R_X86_64_GOTPCREL64: |
1831 | { | |
0ffd9845 ILT |
1832 | gold_assert(have_got_offset); |
1833 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1834 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1835 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1836 | } |
1837 | break; | |
1838 | ||
2e30d253 ILT |
1839 | case elfcpp::R_X86_64_COPY: |
1840 | case elfcpp::R_X86_64_GLOB_DAT: | |
1841 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1842 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1843 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1844 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1845 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1846 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1847 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1848 | _("unexpected reloc %u in object file"), | |
1849 | r_type); | |
2e30d253 ILT |
1850 | break; |
1851 | ||
d61c17ea | 1852 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1853 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1854 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1855 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1856 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1857 | case elfcpp::R_X86_64_DTPOFF32: |
1858 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1859 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1860 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1861 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1862 | view, address, view_size); | |
2e30d253 | 1863 | break; |
2e30d253 | 1864 | |
fdc2f80f ILT |
1865 | case elfcpp::R_X86_64_SIZE32: |
1866 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1867 | default: |
75f2446e ILT |
1868 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1869 | _("unsupported reloc %u"), | |
1870 | r_type); | |
2e30d253 ILT |
1871 | break; |
1872 | } | |
1873 | ||
1874 | return true; | |
1875 | } | |
1876 | ||
1877 | // Perform a TLS relocation. | |
1878 | ||
1879 | inline void | |
d61c17ea | 1880 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1881 | Target_x86_64* target, |
d61c17ea | 1882 | size_t relnum, |
72ec2876 | 1883 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1884 | unsigned int r_type, |
1885 | const Sized_symbol<64>* gsym, | |
1886 | const Symbol_value<64>* psymval, | |
1887 | unsigned char* view, | |
6a41d30b | 1888 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1889 | section_size_type view_size) |
2e30d253 | 1890 | { |
2e30d253 | 1891 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1892 | |
1893 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1894 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1895 | |
1896 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1897 | ||
1898 | const bool is_final = (gsym == NULL | |
8851ecca | 1899 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1900 | : gsym->final_value_is_known()); |
e041f13d ILT |
1901 | const tls::Tls_optimization optimized_type |
1902 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1903 | switch (r_type) |
1904 | { | |
56622147 | 1905 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 1906 | this->saw_tls_block_reloc_ = true; |
e041f13d | 1907 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1908 | { |
7bf1f802 | 1909 | gold_assert(tls_segment != NULL); |
2e30d253 | 1910 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1911 | rela, r_type, value, view, |
2e30d253 ILT |
1912 | view_size); |
1913 | break; | |
1914 | } | |
7bf1f802 ILT |
1915 | else |
1916 | { | |
c2b45e22 CC |
1917 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1918 | ? GOT_TYPE_TLS_OFFSET | |
1919 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
1920 | unsigned int got_offset; |
1921 | if (gsym != NULL) | |
1922 | { | |
c2b45e22 CC |
1923 | gold_assert(gsym->has_got_offset(got_type)); |
1924 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
1925 | } |
1926 | else | |
1927 | { | |
1928 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
1929 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1930 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
1931 | - target->got_size()); |
1932 | } | |
1933 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1934 | { | |
1935 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 1936 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 1937 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 1938 | value, view, address, view_size); |
7bf1f802 ILT |
1939 | break; |
1940 | } | |
1941 | else if (optimized_type == tls::TLSOPT_NONE) | |
1942 | { | |
1943 | // Relocate the field with the offset of the pair of GOT | |
1944 | // entries. | |
6a41d30b ILT |
1945 | value = target->got_plt_section()->address() + got_offset; |
1946 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1947 | address); | |
7bf1f802 ILT |
1948 | break; |
1949 | } | |
1950 | } | |
72ec2876 | 1951 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1952 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1953 | break; |
1954 | ||
c2b45e22 CC |
1955 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
1956 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 1957 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
1958 | if (optimized_type == tls::TLSOPT_TO_LE) |
1959 | { | |
1960 | gold_assert(tls_segment != NULL); | |
1961 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1962 | rela, r_type, value, view, | |
1963 | view_size); | |
1964 | break; | |
1965 | } | |
1966 | else | |
1967 | { | |
1968 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1969 | ? GOT_TYPE_TLS_OFFSET | |
1970 | : GOT_TYPE_TLS_DESC); | |
1971 | unsigned int got_offset; | |
1972 | if (gsym != NULL) | |
1973 | { | |
1974 | gold_assert(gsym->has_got_offset(got_type)); | |
1975 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1976 | } | |
1977 | else | |
1978 | { | |
1979 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
1980 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1981 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1982 | - target->got_size()); | |
1983 | } | |
1984 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1985 | { | |
1986 | gold_assert(tls_segment != NULL); | |
1987 | value = target->got_plt_section()->address() + got_offset; | |
1988 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
1989 | rela, r_type, value, view, address, | |
1990 | view_size); | |
1991 | break; | |
1992 | } | |
1993 | else if (optimized_type == tls::TLSOPT_NONE) | |
1994 | { | |
1995 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
1996 | { | |
1997 | // Relocate the field with the offset of the pair of GOT | |
1998 | // entries. | |
1999 | value = target->got_plt_section()->address() + got_offset; | |
2000 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2001 | address); | |
2002 | } | |
2003 | break; | |
2004 | } | |
2005 | } | |
2006 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2007 | _("unsupported reloc %u"), r_type); | |
2008 | break; | |
2009 | ||
56622147 | 2010 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2011 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2012 | if (optimized_type == tls::TLSOPT_TO_LE) |
2013 | { | |
7bf1f802 | 2014 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2015 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2016 | value, view, view_size); | |
2017 | break; | |
e041f13d | 2018 | } |
7bf1f802 ILT |
2019 | else if (optimized_type == tls::TLSOPT_NONE) |
2020 | { | |
2021 | // Relocate the field with the offset of the GOT entry for | |
2022 | // the module index. | |
2023 | unsigned int got_offset; | |
31d60480 ILT |
2024 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2025 | - target->got_size()); | |
6a41d30b ILT |
2026 | value = target->got_plt_section()->address() + got_offset; |
2027 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2028 | address); | |
7bf1f802 ILT |
2029 | break; |
2030 | } | |
72ec2876 | 2031 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2032 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2033 | break; |
0ffd9845 ILT |
2034 | |
2035 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 2036 | gold_assert(tls_segment != NULL); |
e041f13d | 2037 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2038 | { |
2039 | // This relocation type is used in debugging information. | |
2040 | // In that case we need to not optimize the value. If we | |
2041 | // haven't seen a TLSLD reloc, then we assume we should not | |
2042 | // optimize this reloc. | |
2043 | if (this->saw_tls_block_reloc_) | |
2044 | value -= tls_segment->memsz(); | |
2045 | } | |
6a41d30b | 2046 | Relocate_functions<64, false>::rela32(view, value, 0); |
0ffd9845 ILT |
2047 | break; |
2048 | ||
2049 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 2050 | gold_assert(tls_segment != NULL); |
e041f13d | 2051 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2052 | { |
2053 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2054 | if (this->saw_tls_block_reloc_) | |
2055 | value -= tls_segment->memsz(); | |
2056 | } | |
6a41d30b | 2057 | Relocate_functions<64, false>::rela64(view, value, 0); |
0ffd9845 | 2058 | break; |
2e30d253 | 2059 | |
56622147 ILT |
2060 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2061 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2062 | { | |
7bf1f802 | 2063 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2064 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2065 | rela, r_type, value, view, | |
2066 | view_size); | |
2067 | break; | |
2068 | } | |
7bf1f802 ILT |
2069 | else if (optimized_type == tls::TLSOPT_NONE) |
2070 | { | |
2071 | // Relocate the field with the offset of the GOT entry for | |
2072 | // the tp-relative offset of the symbol. | |
2073 | unsigned int got_offset; | |
2074 | if (gsym != NULL) | |
2075 | { | |
0a65a3a7 CC |
2076 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2077 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2078 | - target->got_size()); | |
7bf1f802 ILT |
2079 | } |
2080 | else | |
2081 | { | |
2082 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2083 | gold_assert(object->local_has_got_offset(r_sym, |
2084 | GOT_TYPE_TLS_OFFSET)); | |
2085 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2086 | - target->got_size()); |
2087 | } | |
6a41d30b ILT |
2088 | value = target->got_plt_section()->address() + got_offset; |
2089 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2090 | break; |
2091 | } | |
56622147 ILT |
2092 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2093 | _("unsupported reloc type %u"), | |
2094 | r_type); | |
2095 | break; | |
0ffd9845 | 2096 | |
56622147 | 2097 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b ILT |
2098 | value -= tls_segment->memsz(); |
2099 | Relocate_functions<64, false>::rela32(view, value, 0); | |
56622147 | 2100 | break; |
2e30d253 | 2101 | } |
2e30d253 ILT |
2102 | } |
2103 | ||
7bf1f802 ILT |
2104 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2105 | // Initial-Exec. | |
2106 | ||
2107 | inline void | |
2108 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2109 | size_t relnum, | |
c2b45e22 | 2110 | Output_segment*, |
7bf1f802 ILT |
2111 | const elfcpp::Rela<64, false>& rela, |
2112 | unsigned int, | |
2113 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2114 | unsigned char* view, | |
c2b45e22 | 2115 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2116 | section_size_type view_size) |
7bf1f802 ILT |
2117 | { |
2118 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2119 | // .word 0x6666; rex64; call __tls_get_addr | |
2120 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2121 | ||
2122 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2123 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2124 | ||
2125 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2126 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2127 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2128 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2129 | ||
2130 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2131 | ||
c2b45e22 CC |
2132 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2133 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2134 | |
2135 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2136 | // We can skip it. | |
2137 | this->skip_call_tls_get_addr_ = true; | |
2138 | } | |
2139 | ||
e041f13d | 2140 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2141 | // Local-Exec. |
2142 | ||
2143 | inline void | |
d61c17ea ILT |
2144 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2145 | size_t relnum, | |
2146 | Output_segment* tls_segment, | |
72ec2876 | 2147 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2148 | unsigned int, |
2149 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2150 | unsigned char* view, | |
fe8718a4 | 2151 | section_size_type view_size) |
2e30d253 | 2152 | { |
0ffd9845 ILT |
2153 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2154 | // .word 0x6666; rex64; call __tls_get_addr | |
2155 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2156 | |
72ec2876 ILT |
2157 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2158 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2159 | |
72ec2876 ILT |
2160 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2161 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2162 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2163 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2164 | |
0ffd9845 | 2165 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2166 | |
6a41d30b | 2167 | value -= tls_segment->memsz(); |
0ffd9845 | 2168 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2169 | |
2170 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2171 | // We can skip it. | |
2172 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2173 | } |
2174 | ||
c2b45e22 CC |
2175 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2176 | ||
2177 | inline void | |
2178 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2179 | const Relocate_info<64, false>* relinfo, | |
2180 | size_t relnum, | |
2181 | Output_segment*, | |
2182 | const elfcpp::Rela<64, false>& rela, | |
2183 | unsigned int r_type, | |
2184 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2185 | unsigned char* view, | |
2186 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2187 | section_size_type view_size) | |
2188 | { | |
2189 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2190 | { | |
2191 | // leaq foo@tlsdesc(%rip), %rax | |
2192 | // ==> movq foo@gottpoff(%rip), %rax | |
2193 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2194 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2195 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2196 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2197 | view[-2] = 0x8b; | |
2198 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2199 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2200 | } | |
2201 | else | |
2202 | { | |
2203 | // call *foo@tlscall(%rax) | |
2204 | // ==> nop; nop | |
2205 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2206 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2207 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2208 | view[0] == 0xff && view[1] == 0x10); | |
2209 | view[0] = 0x66; | |
2210 | view[1] = 0x90; | |
2211 | } | |
2212 | } | |
2213 | ||
2214 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2215 | ||
2216 | inline void | |
2217 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2218 | const Relocate_info<64, false>* relinfo, | |
2219 | size_t relnum, | |
2220 | Output_segment* tls_segment, | |
2221 | const elfcpp::Rela<64, false>& rela, | |
2222 | unsigned int r_type, | |
2223 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2224 | unsigned char* view, | |
2225 | section_size_type view_size) | |
2226 | { | |
2227 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2228 | { | |
2229 | // leaq foo@tlsdesc(%rip), %rax | |
2230 | // ==> movq foo@tpoff, %rax | |
2231 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2232 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2233 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2234 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2235 | view[-2] = 0xc7; | |
2236 | view[-1] = 0xc0; | |
2237 | value -= tls_segment->memsz(); | |
2238 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2239 | } | |
2240 | else | |
2241 | { | |
2242 | // call *foo@tlscall(%rax) | |
2243 | // ==> nop; nop | |
2244 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2245 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2246 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2247 | view[0] == 0xff && view[1] == 0x10); | |
2248 | view[0] = 0x66; | |
2249 | view[1] = 0x90; | |
2250 | } | |
2251 | } | |
2252 | ||
2e30d253 | 2253 | inline void |
72ec2876 ILT |
2254 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2255 | size_t relnum, | |
2256 | Output_segment*, | |
2257 | const elfcpp::Rela<64, false>& rela, | |
2258 | unsigned int, | |
2259 | elfcpp::Elf_types<64>::Elf_Addr, | |
2260 | unsigned char* view, | |
fe8718a4 | 2261 | section_size_type view_size) |
2e30d253 | 2262 | { |
72ec2876 ILT |
2263 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2264 | // ... leq foo@dtpoff(%rax),%reg | |
2265 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2266 | |
72ec2876 ILT |
2267 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2268 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2269 | |
72ec2876 ILT |
2270 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2271 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2272 | ||
2273 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2274 | ||
2275 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2276 | ||
2277 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2278 | // We can skip it. | |
2279 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2280 | } |
2281 | ||
56622147 ILT |
2282 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2283 | // Local-Exec. | |
2284 | ||
2285 | inline void | |
2286 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2287 | size_t relnum, | |
2288 | Output_segment* tls_segment, | |
2289 | const elfcpp::Rela<64, false>& rela, | |
2290 | unsigned int, | |
2291 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2292 | unsigned char* view, | |
fe8718a4 | 2293 | section_size_type view_size) |
56622147 ILT |
2294 | { |
2295 | // We need to examine the opcodes to figure out which instruction we | |
2296 | // are looking at. | |
2297 | ||
2298 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2299 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2300 | ||
2301 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2302 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2303 | ||
2304 | unsigned char op1 = view[-3]; | |
2305 | unsigned char op2 = view[-2]; | |
2306 | unsigned char op3 = view[-1]; | |
2307 | unsigned char reg = op3 >> 3; | |
2308 | ||
2309 | if (op2 == 0x8b) | |
2310 | { | |
2311 | // movq | |
2312 | if (op1 == 0x4c) | |
2313 | view[-3] = 0x49; | |
2314 | view[-2] = 0xc7; | |
2315 | view[-1] = 0xc0 | reg; | |
2316 | } | |
2317 | else if (reg == 4) | |
2318 | { | |
2319 | // Special handling for %rsp. | |
2320 | if (op1 == 0x4c) | |
2321 | view[-3] = 0x49; | |
2322 | view[-2] = 0x81; | |
2323 | view[-1] = 0xc0 | reg; | |
2324 | } | |
2325 | else | |
2326 | { | |
2327 | // addq | |
2328 | if (op1 == 0x4c) | |
2329 | view[-3] = 0x4d; | |
2330 | view[-2] = 0x8d; | |
2331 | view[-1] = 0x80 | reg | (reg << 3); | |
2332 | } | |
2333 | ||
6a41d30b | 2334 | value -= tls_segment->memsz(); |
56622147 ILT |
2335 | Relocate_functions<64, false>::rela32(view, value, 0); |
2336 | } | |
2337 | ||
2e30d253 ILT |
2338 | // Relocate section data. |
2339 | ||
2340 | void | |
2341 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2342 | unsigned int sh_type, |
2343 | const unsigned char* prelocs, | |
2344 | size_t reloc_count, | |
730cdc88 ILT |
2345 | Output_section* output_section, |
2346 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2347 | unsigned char* view, |
2348 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2349 | section_size_type view_size) |
2e30d253 ILT |
2350 | { |
2351 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2352 | ||
2353 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2354 | Target_x86_64::Relocate>( | |
2355 | relinfo, | |
2356 | this, | |
2357 | prelocs, | |
2358 | reloc_count, | |
730cdc88 ILT |
2359 | output_section, |
2360 | needs_special_offset_handling, | |
2e30d253 ILT |
2361 | view, |
2362 | address, | |
2363 | view_size); | |
2364 | } | |
2365 | ||
6a74a719 ILT |
2366 | // Return the size of a relocation while scanning during a relocatable |
2367 | // link. | |
2368 | ||
2369 | unsigned int | |
2370 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2371 | unsigned int r_type, | |
2372 | Relobj* object) | |
2373 | { | |
2374 | switch (r_type) | |
2375 | { | |
2376 | case elfcpp::R_X86_64_NONE: | |
2377 | case elfcpp::R_386_GNU_VTINHERIT: | |
2378 | case elfcpp::R_386_GNU_VTENTRY: | |
2379 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2380 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2381 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2382 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2383 | case elfcpp::R_X86_64_DTPOFF32: | |
2384 | case elfcpp::R_X86_64_DTPOFF64: | |
2385 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2386 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2387 | return 0; | |
2388 | ||
2389 | case elfcpp::R_X86_64_64: | |
2390 | case elfcpp::R_X86_64_PC64: | |
2391 | case elfcpp::R_X86_64_GOTOFF64: | |
2392 | case elfcpp::R_X86_64_GOTPC64: | |
2393 | case elfcpp::R_X86_64_PLTOFF64: | |
2394 | case elfcpp::R_X86_64_GOT64: | |
2395 | case elfcpp::R_X86_64_GOTPCREL64: | |
2396 | case elfcpp::R_X86_64_GOTPCREL: | |
2397 | case elfcpp::R_X86_64_GOTPLT64: | |
2398 | return 8; | |
2399 | ||
2400 | case elfcpp::R_X86_64_32: | |
2401 | case elfcpp::R_X86_64_32S: | |
2402 | case elfcpp::R_X86_64_PC32: | |
2403 | case elfcpp::R_X86_64_PLT32: | |
2404 | case elfcpp::R_X86_64_GOTPC32: | |
2405 | case elfcpp::R_X86_64_GOT32: | |
2406 | return 4; | |
2407 | ||
2408 | case elfcpp::R_X86_64_16: | |
2409 | case elfcpp::R_X86_64_PC16: | |
2410 | return 2; | |
2411 | ||
2412 | case elfcpp::R_X86_64_8: | |
2413 | case elfcpp::R_X86_64_PC8: | |
2414 | return 1; | |
2415 | ||
2416 | case elfcpp::R_X86_64_COPY: | |
2417 | case elfcpp::R_X86_64_GLOB_DAT: | |
2418 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2419 | case elfcpp::R_X86_64_RELATIVE: | |
2420 | // These are outstanding tls relocs, which are unexpected when linking | |
2421 | case elfcpp::R_X86_64_TPOFF64: | |
2422 | case elfcpp::R_X86_64_DTPMOD64: | |
2423 | case elfcpp::R_X86_64_TLSDESC: | |
2424 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2425 | return 0; | |
2426 | ||
2427 | case elfcpp::R_X86_64_SIZE32: | |
2428 | case elfcpp::R_X86_64_SIZE64: | |
2429 | default: | |
2430 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2431 | return 0; | |
2432 | } | |
2433 | } | |
2434 | ||
2435 | // Scan the relocs during a relocatable link. | |
2436 | ||
2437 | void | |
2438 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2439 | Symbol_table* symtab, | |
2440 | Layout* layout, | |
2441 | Sized_relobj<64, false>* object, | |
2442 | unsigned int data_shndx, | |
2443 | unsigned int sh_type, | |
2444 | const unsigned char* prelocs, | |
2445 | size_t reloc_count, | |
2446 | Output_section* output_section, | |
2447 | bool needs_special_offset_handling, | |
2448 | size_t local_symbol_count, | |
2449 | const unsigned char* plocal_symbols, | |
2450 | Relocatable_relocs* rr) | |
2451 | { | |
2452 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2453 | ||
2454 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2455 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2456 | ||
7019cd25 | 2457 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2458 | Scan_relocatable_relocs>( |
2459 | options, | |
2460 | symtab, | |
2461 | layout, | |
2462 | object, | |
2463 | data_shndx, | |
2464 | prelocs, | |
2465 | reloc_count, | |
2466 | output_section, | |
2467 | needs_special_offset_handling, | |
2468 | local_symbol_count, | |
2469 | plocal_symbols, | |
2470 | rr); | |
2471 | } | |
2472 | ||
2473 | // Relocate a section during a relocatable link. | |
2474 | ||
2475 | void | |
2476 | Target_x86_64::relocate_for_relocatable( | |
2477 | const Relocate_info<64, false>* relinfo, | |
2478 | unsigned int sh_type, | |
2479 | const unsigned char* prelocs, | |
2480 | size_t reloc_count, | |
2481 | Output_section* output_section, | |
2482 | off_t offset_in_output_section, | |
2483 | const Relocatable_relocs* rr, | |
2484 | unsigned char* view, | |
2485 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2486 | section_size_type view_size, | |
2487 | unsigned char* reloc_view, | |
2488 | section_size_type reloc_view_size) | |
2489 | { | |
2490 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2491 | ||
7019cd25 | 2492 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2493 | relinfo, |
2494 | prelocs, | |
2495 | reloc_count, | |
2496 | output_section, | |
2497 | offset_in_output_section, | |
2498 | rr, | |
2499 | view, | |
2500 | view_address, | |
2501 | view_size, | |
2502 | reloc_view, | |
2503 | reloc_view_size); | |
2504 | } | |
2505 | ||
4fb6c25d ILT |
2506 | // Return the value to use for a dynamic which requires special |
2507 | // treatment. This is how we support equality comparisons of function | |
2508 | // pointers across shared library boundaries, as described in the | |
2509 | // processor specific ABI supplement. | |
2510 | ||
2511 | uint64_t | |
2512 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2513 | { | |
2514 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2515 | return this->plt_section()->address() + gsym->plt_offset(); | |
2516 | } | |
2517 | ||
2e30d253 ILT |
2518 | // Return a string used to fill a code section with nops to take up |
2519 | // the specified length. | |
2520 | ||
2521 | std::string | |
8851ecca | 2522 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2523 | { |
2524 | if (length >= 16) | |
2525 | { | |
2526 | // Build a jmpq instruction to skip over the bytes. | |
2527 | unsigned char jmp[5]; | |
2528 | jmp[0] = 0xe9; | |
04bf7072 | 2529 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2530 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2531 | + std::string(length - 5, '\0')); | |
2532 | } | |
2533 | ||
2534 | // Nop sequences of various lengths. | |
2535 | const char nop1[1] = { 0x90 }; // nop | |
2536 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2537 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2538 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2539 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2540 | 0x00 }; // leal 0(%esi,1),%esi | |
2541 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2542 | 0x00, 0x00 }; | |
2543 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2544 | 0x00, 0x00, 0x00 }; | |
2545 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2546 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2547 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2548 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2549 | 0x00 }; | |
2550 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2551 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2552 | 0x00, 0x00 }; | |
2553 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2554 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2555 | 0x00, 0x00, 0x00 }; | |
2556 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2557 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2558 | 0x00, 0x00, 0x00, 0x00 }; | |
2559 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2560 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2561 | 0x27, 0x00, 0x00, 0x00, | |
2562 | 0x00 }; | |
2563 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2564 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2565 | 0xbc, 0x27, 0x00, 0x00, | |
2566 | 0x00, 0x00 }; | |
2567 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2568 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2569 | 0x90, 0x90, 0x90, 0x90, | |
2570 | 0x90, 0x90, 0x90 }; | |
2571 | ||
2572 | const char* nops[16] = { | |
2573 | NULL, | |
2574 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2575 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2576 | }; | |
2577 | ||
2578 | return std::string(nops[length], length); | |
2579 | } | |
2580 | ||
2581 | // The selector for x86_64 object files. | |
2582 | ||
2583 | class Target_selector_x86_64 : public Target_selector | |
2584 | { | |
2585 | public: | |
2586 | Target_selector_x86_64() | |
e96caa79 | 2587 | : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64") |
2e30d253 ILT |
2588 | { } |
2589 | ||
2590 | Target* | |
e96caa79 ILT |
2591 | do_instantiate_target() |
2592 | { return new Target_x86_64(); } | |
2e30d253 ILT |
2593 | }; |
2594 | ||
2e30d253 ILT |
2595 | Target_selector_x86_64 target_selector_x86_64; |
2596 | ||
2597 | } // End anonymous namespace. |