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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 Free Software Foundation, Inc. |
2e30d253 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8b105e34 ILT |
8 | // This program is free software; you can redistribute it and/or modify |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
2e30d253 ILT |
11 | // (at your option) any later version. |
12 | ||
8b105e34 ILT |
13 | // This program is distributed in the hope that it will be useful, |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
2e30d253 ILT |
22 | |
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
26 | ||
27 | #include "elfcpp.h" | |
28 | #include "parameters.h" | |
29 | #include "reloc.h" | |
30 | #include "x86_64.h" | |
31 | #include "object.h" | |
32 | #include "symtab.h" | |
33 | #include "layout.h" | |
34 | #include "output.h" | |
35 | #include "target.h" | |
36 | #include "target-reloc.h" | |
37 | #include "target-select.h" | |
e041f13d | 38 | #include "tls.h" |
2e30d253 ILT |
39 | |
40 | namespace | |
41 | { | |
42 | ||
43 | using namespace gold; | |
44 | ||
45 | class Output_data_plt_x86_64; | |
46 | ||
47 | // The x86_64 target class. | |
d61c17ea ILT |
48 | // See the ABI at |
49 | // http://www.x86-64.org/documentation/abi.pdf | |
50 | // TLS info comes from | |
51 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 52 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 ILT |
53 | |
54 | class Target_x86_64 : public Sized_target<64, false> | |
55 | { | |
56 | public: | |
e822f2b1 ILT |
57 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
58 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
59 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
60 | ||
61 | Target_x86_64() | |
62 | : Sized_target<64, false>(&x86_64_info), | |
0ffd9845 | 63 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
31d60480 | 64 | copy_relocs_(NULL), dynbss_(NULL), got_mod_index_offset_(-1U) |
2e30d253 ILT |
65 | { } |
66 | ||
67 | // Scan the relocations to look for symbol adjustments. | |
68 | void | |
69 | scan_relocs(const General_options& options, | |
70 | Symbol_table* symtab, | |
71 | Layout* layout, | |
72 | Sized_relobj<64, false>* object, | |
73 | unsigned int data_shndx, | |
74 | unsigned int sh_type, | |
75 | const unsigned char* prelocs, | |
76 | size_t reloc_count, | |
730cdc88 ILT |
77 | Output_section* output_section, |
78 | bool needs_special_offset_handling, | |
2e30d253 | 79 | size_t local_symbol_count, |
730cdc88 | 80 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
81 | |
82 | // Finalize the sections. | |
83 | void | |
84 | do_finalize_sections(Layout*); | |
85 | ||
4fb6c25d ILT |
86 | // Return the value to use for a dynamic which requires special |
87 | // treatment. | |
88 | uint64_t | |
89 | do_dynsym_value(const Symbol*) const; | |
90 | ||
2e30d253 ILT |
91 | // Relocate a section. |
92 | void | |
93 | relocate_section(const Relocate_info<64, false>*, | |
94 | unsigned int sh_type, | |
95 | const unsigned char* prelocs, | |
96 | size_t reloc_count, | |
730cdc88 ILT |
97 | Output_section* output_section, |
98 | bool needs_special_offset_handling, | |
2e30d253 ILT |
99 | unsigned char* view, |
100 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
fe8718a4 | 101 | section_size_type view_size); |
2e30d253 | 102 | |
6a74a719 ILT |
103 | // Scan the relocs during a relocatable link. |
104 | void | |
105 | scan_relocatable_relocs(const General_options& options, | |
106 | Symbol_table* symtab, | |
107 | Layout* layout, | |
108 | Sized_relobj<64, false>* object, | |
109 | unsigned int data_shndx, | |
110 | unsigned int sh_type, | |
111 | const unsigned char* prelocs, | |
112 | size_t reloc_count, | |
113 | Output_section* output_section, | |
114 | bool needs_special_offset_handling, | |
115 | size_t local_symbol_count, | |
116 | const unsigned char* plocal_symbols, | |
117 | Relocatable_relocs*); | |
118 | ||
119 | // Relocate a section during a relocatable link. | |
120 | void | |
121 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
122 | unsigned int sh_type, | |
123 | const unsigned char* prelocs, | |
124 | size_t reloc_count, | |
125 | Output_section* output_section, | |
126 | off_t offset_in_output_section, | |
127 | const Relocatable_relocs*, | |
128 | unsigned char* view, | |
129 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
130 | section_size_type view_size, | |
131 | unsigned char* reloc_view, | |
132 | section_size_type reloc_view_size); | |
133 | ||
2e30d253 ILT |
134 | // Return a string used to fill a code section with nops. |
135 | std::string | |
8851ecca | 136 | do_code_fill(section_size_type length) const; |
2e30d253 | 137 | |
9a2d6984 ILT |
138 | // Return whether SYM is defined by the ABI. |
139 | bool | |
140 | do_is_defined_by_abi(Symbol* sym) const | |
141 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } | |
142 | ||
96f2030e | 143 | // Return the size of the GOT section. |
fe8718a4 | 144 | section_size_type |
96f2030e ILT |
145 | got_size() |
146 | { | |
147 | gold_assert(this->got_ != NULL); | |
148 | return this->got_->data_size(); | |
149 | } | |
150 | ||
2e30d253 ILT |
151 | private: |
152 | // The class which scans relocations. | |
a036edd8 | 153 | class Scan |
2e30d253 | 154 | { |
a036edd8 ILT |
155 | public: |
156 | Scan() | |
157 | : issued_non_pic_error_(false) | |
158 | { } | |
159 | ||
2e30d253 ILT |
160 | inline void |
161 | local(const General_options& options, Symbol_table* symtab, | |
162 | Layout* layout, Target_x86_64* target, | |
163 | Sized_relobj<64, false>* object, | |
164 | unsigned int data_shndx, | |
07f397ab | 165 | Output_section* output_section, |
2e30d253 ILT |
166 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
167 | const elfcpp::Sym<64, false>& lsym); | |
168 | ||
169 | inline void | |
170 | global(const General_options& options, Symbol_table* symtab, | |
171 | Layout* layout, Target_x86_64* target, | |
172 | Sized_relobj<64, false>* object, | |
173 | unsigned int data_shndx, | |
07f397ab | 174 | Output_section* output_section, |
2e30d253 ILT |
175 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
176 | Symbol* gsym); | |
e041f13d | 177 | |
a036edd8 | 178 | private: |
e041f13d ILT |
179 | static void |
180 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
181 | ||
182 | static void | |
183 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
184 | Symbol*); | |
a036edd8 ILT |
185 | |
186 | void | |
187 | check_non_pic(Relobj*, unsigned int r_type); | |
188 | ||
189 | // Whether we have issued an error about a non-PIC compilation. | |
190 | bool issued_non_pic_error_; | |
2e30d253 ILT |
191 | }; |
192 | ||
193 | // The class which implements relocation. | |
194 | class Relocate | |
195 | { | |
196 | public: | |
197 | Relocate() | |
198 | : skip_call_tls_get_addr_(false) | |
199 | { } | |
200 | ||
201 | ~Relocate() | |
202 | { | |
203 | if (this->skip_call_tls_get_addr_) | |
204 | { | |
205 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 206 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
207 | } |
208 | } | |
209 | ||
210 | // Do a relocation. Return false if the caller should not issue | |
211 | // any warnings about this relocation. | |
212 | inline bool | |
213 | relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum, | |
214 | const elfcpp::Rela<64, false>&, | |
215 | unsigned int r_type, const Sized_symbol<64>*, | |
216 | const Symbol_value<64>*, | |
217 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 218 | section_size_type); |
2e30d253 ILT |
219 | |
220 | private: | |
221 | // Do a TLS relocation. | |
222 | inline void | |
7bf1f802 ILT |
223 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
224 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
225 | unsigned int r_type, const Sized_symbol<64>*, |
226 | const Symbol_value<64>*, | |
fe8718a4 ILT |
227 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
228 | section_size_type); | |
2e30d253 | 229 | |
7bf1f802 ILT |
230 | // Do a TLS General-Dynamic to Local-Exec transition. |
231 | inline void | |
232 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
233 | Output_segment* tls_segment, | |
234 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
235 | elfcpp::Elf_types<64>::Elf_Addr value, | |
236 | unsigned char* view, | |
fe8718a4 | 237 | section_size_type view_size); |
7bf1f802 | 238 | |
56622147 ILT |
239 | // Do a TLS General-Dynamic to Local-Exec transition. |
240 | inline void | |
241 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
242 | Output_segment* tls_segment, |
243 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
244 | elfcpp::Elf_types<64>::Elf_Addr value, | |
245 | unsigned char* view, | |
fe8718a4 | 246 | section_size_type view_size); |
2e30d253 | 247 | |
56622147 | 248 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 249 | inline void |
56622147 | 250 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
251 | Output_segment* tls_segment, |
252 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
253 | elfcpp::Elf_types<64>::Elf_Addr value, | |
254 | unsigned char* view, | |
fe8718a4 | 255 | section_size_type view_size); |
2e30d253 | 256 | |
56622147 ILT |
257 | // Do a TLS Initial-Exec to Local-Exec transition. |
258 | static inline void | |
259 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
260 | Output_segment* tls_segment, |
261 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
262 | elfcpp::Elf_types<64>::Elf_Addr value, | |
263 | unsigned char* view, | |
fe8718a4 | 264 | section_size_type view_size); |
2e30d253 ILT |
265 | |
266 | // This is set if we should skip the next reloc, which should be a | |
267 | // PLT32 reloc against ___tls_get_addr. | |
268 | bool skip_call_tls_get_addr_; | |
269 | }; | |
270 | ||
6a74a719 ILT |
271 | // A class which returns the size required for a relocation type, |
272 | // used while scanning relocs during a relocatable link. | |
273 | class Relocatable_size_for_reloc | |
274 | { | |
275 | public: | |
276 | unsigned int | |
277 | get_size_for_reloc(unsigned int, Relobj*); | |
278 | }; | |
279 | ||
2e30d253 ILT |
280 | // Adjust TLS relocation type based on the options and whether this |
281 | // is a local symbol. | |
e041f13d | 282 | static tls::Tls_optimization |
2e30d253 ILT |
283 | optimize_tls_reloc(bool is_final, int r_type); |
284 | ||
285 | // Get the GOT section, creating it if necessary. | |
286 | Output_data_got<64, false>* | |
287 | got_section(Symbol_table*, Layout*); | |
288 | ||
96f2030e ILT |
289 | // Get the GOT PLT section. |
290 | Output_data_space* | |
291 | got_plt_section() const | |
292 | { | |
293 | gold_assert(this->got_plt_ != NULL); | |
294 | return this->got_plt_; | |
295 | } | |
296 | ||
2e30d253 ILT |
297 | // Create a PLT entry for a global symbol. |
298 | void | |
299 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
300 | ||
31d60480 ILT |
301 | // Create a GOT entry for the TLS module index. |
302 | unsigned int | |
303 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
304 | Sized_relobj<64, false>* object); | |
305 | ||
2e30d253 ILT |
306 | // Get the PLT section. |
307 | Output_data_plt_x86_64* | |
308 | plt_section() const | |
309 | { | |
310 | gold_assert(this->plt_ != NULL); | |
311 | return this->plt_; | |
312 | } | |
313 | ||
314 | // Get the dynamic reloc section, creating it if necessary. | |
315 | Reloc_section* | |
0ffd9845 | 316 | rela_dyn_section(Layout*); |
2e30d253 | 317 | |
d61c6bd4 ILT |
318 | // Return true if the symbol may need a COPY relocation. |
319 | // References from an executable object to non-function symbols | |
320 | // defined in a dynamic object may need a COPY relocation. | |
321 | bool | |
322 | may_need_copy_reloc(Symbol* gsym) | |
323 | { | |
8851ecca | 324 | return (!parameters->options().shared() |
d61c6bd4 ILT |
325 | && gsym->is_from_dynobj() |
326 | && gsym->type() != elfcpp::STT_FUNC); | |
327 | } | |
328 | ||
2e30d253 ILT |
329 | // Copy a relocation against a global symbol. |
330 | void | |
331 | copy_reloc(const General_options*, Symbol_table*, Layout*, | |
332 | Sized_relobj<64, false>*, unsigned int, | |
4f4c5f80 | 333 | Output_section*, Symbol*, const elfcpp::Rela<64, false>&); |
2e30d253 ILT |
334 | |
335 | // Information about this specific target which we pass to the | |
336 | // general Target structure. | |
337 | static const Target::Target_info x86_64_info; | |
338 | ||
0a65a3a7 CC |
339 | enum Got_type |
340 | { | |
341 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
342 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
343 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
344 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
345 | }; | |
346 | ||
2e30d253 ILT |
347 | // The GOT section. |
348 | Output_data_got<64, false>* got_; | |
349 | // The PLT section. | |
350 | Output_data_plt_x86_64* plt_; | |
351 | // The GOT PLT section. | |
352 | Output_data_space* got_plt_; | |
353 | // The dynamic reloc section. | |
0ffd9845 | 354 | Reloc_section* rela_dyn_; |
2e30d253 ILT |
355 | // Relocs saved to avoid a COPY reloc. |
356 | Copy_relocs<64, false>* copy_relocs_; | |
357 | // Space for variables copied with a COPY reloc. | |
358 | Output_data_space* dynbss_; | |
31d60480 ILT |
359 | // Offset of the GOT entry for the TLS module index; |
360 | unsigned int got_mod_index_offset_; | |
2e30d253 ILT |
361 | }; |
362 | ||
363 | const Target::Target_info Target_x86_64::x86_64_info = | |
364 | { | |
365 | 64, // size | |
366 | false, // is_big_endian | |
367 | elfcpp::EM_X86_64, // machine_code | |
368 | false, // has_make_symbol | |
369 | false, // has_resolve | |
370 | true, // has_code_fill | |
35cdfc9a | 371 | true, // is_default_stack_executable |
0864d551 | 372 | '\0', // wrap_char |
2e30d253 | 373 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 374 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
375 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
376 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
377 | }; |
378 | ||
379 | // Get the GOT section, creating it if necessary. | |
380 | ||
381 | Output_data_got<64, false>* | |
382 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
383 | { | |
384 | if (this->got_ == NULL) | |
385 | { | |
386 | gold_assert(symtab != NULL && layout != NULL); | |
387 | ||
388 | this->got_ = new Output_data_got<64, false>(); | |
389 | ||
390 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
391 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
392 | this->got_); | |
393 | ||
394 | // The old GNU linker creates a .got.plt section. We just | |
395 | // create another set of data in the .got section. Note that we | |
396 | // always create a PLT if we create a GOT, although the PLT | |
397 | // might be empty. | |
2e30d253 ILT |
398 | this->got_plt_ = new Output_data_space(8); |
399 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
400 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
401 | this->got_plt_); | |
402 | ||
403 | // The first three entries are reserved. | |
27bc2bce | 404 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
405 | |
406 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 407 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
408 | this->got_plt_, |
409 | 0, 0, elfcpp::STT_OBJECT, | |
410 | elfcpp::STB_LOCAL, | |
411 | elfcpp::STV_HIDDEN, 0, | |
412 | false, false); | |
413 | } | |
414 | ||
415 | return this->got_; | |
416 | } | |
417 | ||
418 | // Get the dynamic reloc section, creating it if necessary. | |
419 | ||
420 | Target_x86_64::Reloc_section* | |
0ffd9845 | 421 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 422 | { |
0ffd9845 | 423 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
424 | { |
425 | gold_assert(layout != NULL); | |
0ffd9845 | 426 | this->rela_dyn_ = new Reloc_section(); |
2e30d253 | 427 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 428 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 429 | } |
0ffd9845 | 430 | return this->rela_dyn_; |
2e30d253 ILT |
431 | } |
432 | ||
433 | // A class to handle the PLT data. | |
434 | ||
435 | class Output_data_plt_x86_64 : public Output_section_data | |
436 | { | |
437 | public: | |
438 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
439 | ||
440 | Output_data_plt_x86_64(Layout*, Output_data_space*); | |
441 | ||
442 | // Add an entry to the PLT. | |
443 | void | |
444 | add_entry(Symbol* gsym); | |
445 | ||
446 | // Return the .rel.plt section data. | |
447 | const Reloc_section* | |
448 | rel_plt() const | |
449 | { return this->rel_; } | |
450 | ||
451 | protected: | |
452 | void | |
453 | do_adjust_output_section(Output_section* os); | |
454 | ||
455 | private: | |
456 | // The size of an entry in the PLT. | |
457 | static const int plt_entry_size = 16; | |
458 | ||
459 | // The first entry in the PLT. | |
460 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
461 | // procedure linkage table for both programs and shared objects." | |
462 | static unsigned char first_plt_entry[plt_entry_size]; | |
463 | ||
464 | // Other entries in the PLT for an executable. | |
465 | static unsigned char plt_entry[plt_entry_size]; | |
466 | ||
467 | // Set the final size. | |
468 | void | |
27bc2bce | 469 | set_final_data_size() |
2e30d253 ILT |
470 | { this->set_data_size((this->count_ + 1) * plt_entry_size); } |
471 | ||
472 | // Write out the PLT data. | |
473 | void | |
474 | do_write(Output_file*); | |
475 | ||
476 | // The reloc section. | |
477 | Reloc_section* rel_; | |
478 | // The .got.plt section. | |
479 | Output_data_space* got_plt_; | |
480 | // The number of PLT entries. | |
481 | unsigned int count_; | |
482 | }; | |
483 | ||
484 | // Create the PLT section. The ordinary .got section is an argument, | |
485 | // since we need to refer to the start. We also create our own .got | |
486 | // section just for PLT entries. | |
487 | ||
488 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
489 | Output_data_space* got_plt) | |
2e30d253 ILT |
490 | : Output_section_data(8), got_plt_(got_plt), count_(0) |
491 | { | |
492 | this->rel_ = new Reloc_section(); | |
493 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
494 | elfcpp::SHF_ALLOC, this->rel_); | |
495 | } | |
496 | ||
497 | void | |
498 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
499 | { | |
500 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
501 | // linker, and so do we. | |
502 | os->set_entsize(4); | |
503 | } | |
504 | ||
505 | // Add an entry to the PLT. | |
506 | ||
507 | void | |
508 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
509 | { | |
510 | gold_assert(!gsym->has_plt_offset()); | |
511 | ||
512 | // Note that when setting the PLT offset we skip the initial | |
513 | // reserved PLT entry. | |
514 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
515 | ||
516 | ++this->count_; | |
517 | ||
fe8718a4 | 518 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
519 | |
520 | // Every PLT entry needs a GOT entry which points back to the PLT | |
521 | // entry (this will be changed by the dynamic linker, normally | |
522 | // lazily when the function is called). | |
27bc2bce | 523 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
524 | |
525 | // Every PLT entry needs a reloc. | |
526 | gsym->set_needs_dynsym_entry(); | |
527 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
528 | got_offset, 0); | |
529 | ||
530 | // Note that we don't need to save the symbol. The contents of the | |
531 | // PLT are independent of which symbols are used. The symbols only | |
532 | // appear in the relocations. | |
533 | } | |
534 | ||
535 | // The first entry in the PLT for an executable. | |
536 | ||
537 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
538 | { | |
539 | // From AMD64 ABI Draft 0.98, page 76 | |
540 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 541 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
542 | 0xff, 0x25, // jmp indirect |
543 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
544 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
545 | }; | |
546 | ||
547 | // Subsequent entries in the PLT for an executable. | |
548 | ||
549 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
550 | { | |
551 | // From AMD64 ABI Draft 0.98, page 76 | |
552 | 0xff, 0x25, // jmpq indirect | |
553 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
554 | 0x68, // pushq immediate | |
555 | 0, 0, 0, 0, // replaced with offset into relocation table | |
556 | 0xe9, // jmpq relative | |
557 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
558 | }; | |
559 | ||
560 | // Write out the PLT. This uses the hand-coded instructions above, | |
561 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
562 | ||
563 | void | |
564 | Output_data_plt_x86_64::do_write(Output_file* of) | |
565 | { | |
566 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
567 | const section_size_type oview_size = |
568 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
569 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
570 | ||
571 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
572 | const section_size_type got_size = |
573 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
574 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
575 | got_size); | |
576 | ||
577 | unsigned char* pov = oview; | |
578 | ||
579 | elfcpp::Elf_types<32>::Elf_Addr plt_address = this->address(); | |
580 | elfcpp::Elf_types<32>::Elf_Addr got_address = this->got_plt_->address(); | |
581 | ||
582 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd ILT |
583 | // We do a jmp relative to the PC at the end of this instruction. |
584 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, got_address + 8 | |
585 | - (plt_address + 6)); | |
586 | elfcpp::Swap<32, false>::writeval(pov + 8, got_address + 16 | |
587 | - (plt_address + 12)); | |
2e30d253 ILT |
588 | pov += plt_entry_size; |
589 | ||
590 | unsigned char* got_pov = got_view; | |
591 | ||
592 | memset(got_pov, 0, 24); | |
593 | got_pov += 24; | |
594 | ||
595 | unsigned int plt_offset = plt_entry_size; | |
596 | unsigned int got_offset = 24; | |
597 | const unsigned int count = this->count_; | |
598 | for (unsigned int plt_index = 0; | |
599 | plt_index < count; | |
600 | ++plt_index, | |
601 | pov += plt_entry_size, | |
602 | got_pov += 8, | |
603 | plt_offset += plt_entry_size, | |
604 | got_offset += 8) | |
605 | { | |
606 | // Set and adjust the PLT entry itself. | |
607 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
608 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
609 | (got_address + got_offset | |
610 | - (plt_address + plt_offset | |
611 | + 6))); | |
2e30d253 ILT |
612 | |
613 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
614 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
615 | - (plt_offset + plt_entry_size)); | |
616 | ||
617 | // Set the entry in the GOT. | |
618 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
619 | } | |
620 | ||
fe8718a4 ILT |
621 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
622 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
623 | |
624 | of->write_output_view(offset, oview_size, oview); | |
625 | of->write_output_view(got_file_offset, got_size, got_view); | |
626 | } | |
627 | ||
628 | // Create a PLT entry for a global symbol. | |
629 | ||
630 | void | |
631 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
632 | Symbol* gsym) | |
633 | { | |
634 | if (gsym->has_plt_offset()) | |
635 | return; | |
636 | ||
637 | if (this->plt_ == NULL) | |
638 | { | |
639 | // Create the GOT sections first. | |
640 | this->got_section(symtab, layout); | |
641 | ||
642 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_plt_); | |
643 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, | |
644 | (elfcpp::SHF_ALLOC | |
645 | | elfcpp::SHF_EXECINSTR), | |
646 | this->plt_); | |
647 | } | |
648 | ||
649 | this->plt_->add_entry(gsym); | |
650 | } | |
651 | ||
31d60480 ILT |
652 | // Create a GOT entry for the TLS module index. |
653 | ||
654 | unsigned int | |
655 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
656 | Sized_relobj<64, false>* object) | |
657 | { | |
658 | if (this->got_mod_index_offset_ == -1U) | |
659 | { | |
660 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
661 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
662 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
663 | unsigned int got_offset = got->add_constant(0); | |
664 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
665 | got_offset, 0); | |
666 | got->add_constant(0); | |
667 | this->got_mod_index_offset_ = got_offset; | |
668 | } | |
669 | return this->got_mod_index_offset_; | |
670 | } | |
671 | ||
2e30d253 ILT |
672 | // Handle a relocation against a non-function symbol defined in a |
673 | // dynamic object. The traditional way to handle this is to generate | |
674 | // a COPY relocation to copy the variable at runtime from the shared | |
675 | // object into the executable's data segment. However, this is | |
676 | // undesirable in general, as if the size of the object changes in the | |
677 | // dynamic object, the executable will no longer work correctly. If | |
678 | // this relocation is in a writable section, then we can create a | |
679 | // dynamic reloc and the dynamic linker will resolve it to the correct | |
680 | // address at runtime. However, we do not want do that if the | |
681 | // relocation is in a read-only section, as it would prevent the | |
682 | // readonly segment from being shared. And if we have to eventually | |
683 | // generate a COPY reloc, then any dynamic relocations will be | |
684 | // useless. So this means that if this is a writable section, we need | |
685 | // to save the relocation until we see whether we have to create a | |
686 | // COPY relocation for this symbol for any other relocation. | |
687 | ||
688 | void | |
689 | Target_x86_64::copy_reloc(const General_options* options, | |
d61c17ea ILT |
690 | Symbol_table* symtab, |
691 | Layout* layout, | |
692 | Sized_relobj<64, false>* object, | |
4f4c5f80 ILT |
693 | unsigned int data_shndx, |
694 | Output_section* output_section, | |
695 | Symbol* gsym, | |
72ec2876 | 696 | const elfcpp::Rela<64, false>& rela) |
2e30d253 | 697 | { |
7d1a9ebb | 698 | Sized_symbol<64>* ssym = symtab->get_sized_symbol<64>(gsym); |
2e30d253 ILT |
699 | |
700 | if (!Copy_relocs<64, false>::need_copy_reloc(options, object, | |
701 | data_shndx, ssym)) | |
702 | { | |
703 | // So far we do not need a COPY reloc. Save this relocation. | |
704 | // If it turns out that we never need a COPY reloc for this | |
705 | // symbol, then we will emit the relocation. | |
706 | if (this->copy_relocs_ == NULL) | |
707 | this->copy_relocs_ = new Copy_relocs<64, false>(); | |
4f4c5f80 | 708 | this->copy_relocs_->save(ssym, object, data_shndx, output_section, rela); |
2e30d253 ILT |
709 | } |
710 | else | |
711 | { | |
712 | // Allocate space for this symbol in the .bss section. | |
713 | ||
714 | elfcpp::Elf_types<64>::Elf_WXword symsize = ssym->symsize(); | |
715 | ||
716 | // There is no defined way to determine the required alignment | |
717 | // of the symbol. We pick the alignment based on the size. We | |
718 | // set an arbitrary maximum of 256. | |
719 | unsigned int align; | |
720 | for (align = 1; align < 512; align <<= 1) | |
721 | if ((symsize & align) != 0) | |
722 | break; | |
723 | ||
724 | if (this->dynbss_ == NULL) | |
725 | { | |
726 | this->dynbss_ = new Output_data_space(align); | |
727 | layout->add_output_section_data(".bss", | |
728 | elfcpp::SHT_NOBITS, | |
729 | (elfcpp::SHF_ALLOC | |
730 | | elfcpp::SHF_WRITE), | |
731 | this->dynbss_); | |
732 | } | |
733 | ||
734 | Output_data_space* dynbss = this->dynbss_; | |
735 | ||
736 | if (align > dynbss->addralign()) | |
737 | dynbss->set_space_alignment(align); | |
738 | ||
fe8718a4 | 739 | section_size_type dynbss_size = dynbss->current_data_size(); |
2e30d253 | 740 | dynbss_size = align_address(dynbss_size, align); |
fe8718a4 | 741 | section_size_type offset = dynbss_size; |
27bc2bce | 742 | dynbss->set_current_data_size(dynbss_size + symsize); |
2e30d253 | 743 | |
9b07f471 | 744 | symtab->define_with_copy_reloc(ssym, dynbss, offset); |
2e30d253 ILT |
745 | |
746 | // Add the COPY reloc. | |
0ffd9845 ILT |
747 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
748 | rela_dyn->add_global(ssym, elfcpp::R_X86_64_COPY, dynbss, offset, 0); | |
2e30d253 ILT |
749 | } |
750 | } | |
751 | ||
752 | ||
753 | // Optimize the TLS relocation type based on what we know about the | |
754 | // symbol. IS_FINAL is true if the final address of this symbol is | |
755 | // known at link time. | |
756 | ||
e041f13d | 757 | tls::Tls_optimization |
2e30d253 ILT |
758 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
759 | { | |
2e30d253 ILT |
760 | // If we are generating a shared library, then we can't do anything |
761 | // in the linker. | |
8851ecca | 762 | if (parameters->options().shared()) |
e041f13d | 763 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
764 | |
765 | switch (r_type) | |
766 | { | |
767 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
768 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
769 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
770 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
771 | // access. Since we know that we are generating an executable, |
772 | // we can convert this to Initial-Exec. If we also know that | |
773 | // this is a local symbol, we can further switch to Local-Exec. | |
774 | if (is_final) | |
e041f13d ILT |
775 | return tls::TLSOPT_TO_LE; |
776 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 777 | |
d61c17ea | 778 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
779 | // This is Local-Dynamic, which refers to a local symbol in the |
780 | // dynamic TLS block. Since we know that we generating an | |
781 | // executable, we can switch to Local-Exec. | |
e041f13d | 782 | return tls::TLSOPT_TO_LE; |
2e30d253 | 783 | |
0ffd9845 | 784 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
785 | case elfcpp::R_X86_64_DTPOFF64: |
786 | // Another Local-Dynamic reloc. | |
e041f13d | 787 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 788 | |
d61c17ea | 789 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
790 | // These are Initial-Exec relocs which get the thread offset |
791 | // from the GOT. If we know that we are linking against the | |
792 | // local symbol, we can switch to Local-Exec, which links the | |
793 | // thread offset into the instruction. | |
794 | if (is_final) | |
e041f13d ILT |
795 | return tls::TLSOPT_TO_LE; |
796 | return tls::TLSOPT_NONE; | |
2e30d253 | 797 | |
d61c17ea | 798 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
799 | // When we already have Local-Exec, there is nothing further we |
800 | // can do. | |
e041f13d | 801 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
802 | |
803 | default: | |
804 | gold_unreachable(); | |
805 | } | |
2e30d253 ILT |
806 | } |
807 | ||
e041f13d ILT |
808 | // Report an unsupported relocation against a local symbol. |
809 | ||
810 | void | |
811 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
812 | unsigned int r_type) | |
813 | { | |
75f2446e ILT |
814 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
815 | object->name().c_str(), r_type); | |
e041f13d ILT |
816 | } |
817 | ||
a036edd8 ILT |
818 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
819 | // dynamic linker does not support it, issue an error. The GNU linker | |
820 | // only issues a non-PIC error for an allocated read-only section. | |
821 | // Here we know the section is allocated, but we don't know that it is | |
822 | // read-only. But we check for all the relocation types which the | |
823 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
824 | // error even if the section is not read-only. | |
825 | ||
826 | void | |
827 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
828 | { | |
829 | switch (r_type) | |
830 | { | |
831 | // These are the relocation types supported by glibc for x86_64. | |
832 | case elfcpp::R_X86_64_RELATIVE: | |
833 | case elfcpp::R_X86_64_GLOB_DAT: | |
834 | case elfcpp::R_X86_64_JUMP_SLOT: | |
835 | case elfcpp::R_X86_64_DTPMOD64: | |
836 | case elfcpp::R_X86_64_DTPOFF64: | |
837 | case elfcpp::R_X86_64_TPOFF64: | |
838 | case elfcpp::R_X86_64_64: | |
839 | case elfcpp::R_X86_64_32: | |
840 | case elfcpp::R_X86_64_PC32: | |
841 | case elfcpp::R_X86_64_COPY: | |
842 | return; | |
843 | ||
844 | default: | |
845 | // This prevents us from issuing more than one error per reloc | |
846 | // section. But we can still wind up issuing more than one | |
847 | // error per object file. | |
848 | if (this->issued_non_pic_error_) | |
849 | return; | |
850 | object->error(_("requires unsupported dynamic reloc; " | |
851 | "recompile with -fPIC")); | |
852 | this->issued_non_pic_error_ = true; | |
853 | return; | |
854 | ||
855 | case elfcpp::R_X86_64_NONE: | |
856 | gold_unreachable(); | |
857 | } | |
858 | } | |
859 | ||
2e30d253 ILT |
860 | // Scan a relocation for a local symbol. |
861 | ||
862 | inline void | |
863 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
864 | Symbol_table* symtab, |
865 | Layout* layout, | |
866 | Target_x86_64* target, | |
867 | Sized_relobj<64, false>* object, | |
0ffd9845 | 868 | unsigned int data_shndx, |
4f4c5f80 | 869 | Output_section* output_section, |
0ffd9845 | 870 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 871 | unsigned int r_type, |
7bf1f802 | 872 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
873 | { |
874 | switch (r_type) | |
875 | { | |
876 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
877 | case elfcpp::R_386_GNU_VTINHERIT: |
878 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
879 | break; |
880 | ||
881 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 882 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
883 | // executable), we need to create a dynamic relocation for this |
884 | // location. The relocation applied at link time will apply the | |
885 | // link-time value, so we flag the location with an | |
886 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 887 | // relocate it easily. |
8851ecca | 888 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 889 | { |
e8c846c3 | 890 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 891 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
892 | rela_dyn->add_local_relative(object, r_sym, |
893 | elfcpp::R_X86_64_RELATIVE, | |
894 | output_section, data_shndx, | |
895 | reloc.get_r_offset(), | |
896 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
897 | } |
898 | break; | |
899 | ||
2e30d253 ILT |
900 | case elfcpp::R_X86_64_32: |
901 | case elfcpp::R_X86_64_32S: | |
902 | case elfcpp::R_X86_64_16: | |
903 | case elfcpp::R_X86_64_8: | |
96f2030e | 904 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
905 | // executable), we need to create a dynamic relocation for this |
906 | // location. We can't use an R_X86_64_RELATIVE relocation | |
907 | // because that is always a 64-bit relocation. | |
8851ecca | 908 | if (parameters->options().output_is_position_independent()) |
96f2030e | 909 | { |
a036edd8 ILT |
910 | this->check_non_pic(object, r_type); |
911 | ||
96f2030e | 912 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
dceae3c1 ILT |
913 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
914 | { | |
915 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
916 | rela_dyn->add_local(object, r_sym, r_type, output_section, | |
917 | data_shndx, reloc.get_r_offset(), | |
918 | reloc.get_r_addend()); | |
919 | } | |
920 | else | |
921 | { | |
922 | gold_assert(lsym.get_st_value() == 0); | |
923 | rela_dyn->add_local_section(object, lsym.get_st_shndx(), | |
924 | r_type, output_section, | |
925 | data_shndx, reloc.get_r_offset(), | |
926 | reloc.get_r_addend()); | |
927 | } | |
96f2030e | 928 | } |
2e30d253 ILT |
929 | break; |
930 | ||
931 | case elfcpp::R_X86_64_PC64: | |
932 | case elfcpp::R_X86_64_PC32: | |
933 | case elfcpp::R_X86_64_PC16: | |
934 | case elfcpp::R_X86_64_PC8: | |
935 | break; | |
936 | ||
f389a824 ILT |
937 | case elfcpp::R_X86_64_PLT32: |
938 | // Since we know this is a local symbol, we can handle this as a | |
939 | // PC32 reloc. | |
940 | break; | |
941 | ||
fdc2f80f | 942 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 943 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
944 | case elfcpp::R_X86_64_GOTPC64: |
945 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
946 | // We need a GOT section. |
947 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
948 | // For PLTOFF64, we'd normally want a PLT section, but since we |
949 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
950 | break; |
951 | ||
0ffd9845 ILT |
952 | case elfcpp::R_X86_64_GOT64: |
953 | case elfcpp::R_X86_64_GOT32: | |
954 | case elfcpp::R_X86_64_GOTPCREL64: | |
955 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 956 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
957 | { |
958 | // The symbol requires a GOT entry. | |
959 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
960 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 961 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
962 | { |
963 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 964 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 965 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
966 | { |
967 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
968 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
969 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
970 | rela_dyn->add_local_relative( |
971 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
972 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 973 | else |
dceae3c1 | 974 | { |
a036edd8 ILT |
975 | this->check_non_pic(object, r_type); |
976 | ||
dceae3c1 | 977 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
978 | rela_dyn->add_local( |
979 | object, r_sym, r_type, got, | |
980 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 981 | } |
0ffd9845 ILT |
982 | } |
983 | } | |
ee9e9e86 ILT |
984 | // For GOTPLT64, we'd normally want a PLT section, but since |
985 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
986 | } |
987 | break; | |
988 | ||
2e30d253 ILT |
989 | case elfcpp::R_X86_64_COPY: |
990 | case elfcpp::R_X86_64_GLOB_DAT: | |
991 | case elfcpp::R_X86_64_JUMP_SLOT: | |
992 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 993 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 994 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 995 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 996 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
997 | gold_error(_("%s: unexpected reloc %u in object file"), |
998 | object->name().c_str(), r_type); | |
2e30d253 ILT |
999 | break; |
1000 | ||
d61c17ea | 1001 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1002 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1003 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1004 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1005 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1006 | case elfcpp::R_X86_64_DTPOFF32: |
1007 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1008 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1009 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1010 | { |
8851ecca | 1011 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1012 | const tls::Tls_optimization optimized_type |
1013 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1014 | switch (r_type) |
1015 | { | |
56622147 | 1016 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1017 | if (optimized_type == tls::TLSOPT_NONE) |
1018 | { | |
1019 | // Create a pair of GOT entries for the module index and | |
1020 | // dtv-relative offset. | |
1021 | Output_data_got<64, false>* got | |
1022 | = target->got_section(symtab, layout); | |
1023 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 CC |
1024 | got->add_local_pair_with_rela(object, r_sym, |
1025 | lsym.get_st_shndx(), | |
1026 | GOT_TYPE_TLS_PAIR, | |
1027 | target->rela_dyn_section(layout), | |
1028 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1029 | } |
1030 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1031 | unsupported_reloc_local(object, r_type); | |
1032 | break; | |
1033 | ||
56622147 ILT |
1034 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1035 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1036 | // FIXME: If not relaxing to LE, we need to generate | |
7bf1f802 | 1037 | // a GOT entry with a R_x86_64_TLSDESC reloc. |
56622147 ILT |
1038 | if (optimized_type != tls::TLSOPT_TO_LE) |
1039 | unsupported_reloc_local(object, r_type); | |
2e30d253 ILT |
1040 | break; |
1041 | ||
e041f13d | 1042 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1043 | if (optimized_type == tls::TLSOPT_NONE) |
1044 | { | |
1045 | // Create a GOT entry for the module index. | |
31d60480 | 1046 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1047 | } |
1048 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1049 | unsupported_reloc_local(object, r_type); | |
1050 | break; | |
1051 | ||
0ffd9845 ILT |
1052 | case elfcpp::R_X86_64_DTPOFF32: |
1053 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1054 | break; |
1055 | ||
56622147 | 1056 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1057 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1058 | if (optimized_type == tls::TLSOPT_NONE) |
1059 | { | |
1060 | // Create a GOT entry for the tp-relative offset. | |
1061 | Output_data_got<64, false>* got | |
1062 | = target->got_section(symtab, layout); | |
1063 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1064 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1065 | target->rela_dyn_section(layout), |
1066 | elfcpp::R_X86_64_TPOFF64); | |
1067 | } | |
1068 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1069 | unsupported_reloc_local(object, r_type); |
1070 | break; | |
0ffd9845 | 1071 | |
56622147 | 1072 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1073 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1074 | if (output_is_shared) |
1075 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1076 | break; |
e041f13d ILT |
1077 | |
1078 | default: | |
1079 | gold_unreachable(); | |
2e30d253 ILT |
1080 | } |
1081 | } | |
1082 | break; | |
2e30d253 | 1083 | |
fdc2f80f ILT |
1084 | case elfcpp::R_X86_64_SIZE32: |
1085 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1086 | default: |
75f2446e ILT |
1087 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1088 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1089 | break; |
1090 | } | |
1091 | } | |
1092 | ||
1093 | ||
e041f13d ILT |
1094 | // Report an unsupported relocation against a global symbol. |
1095 | ||
1096 | void | |
1097 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1098 | unsigned int r_type, | |
1099 | Symbol* gsym) | |
1100 | { | |
75f2446e | 1101 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1102 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1103 | } |
1104 | ||
2e30d253 ILT |
1105 | // Scan a relocation for a global symbol. |
1106 | ||
1107 | inline void | |
1108 | Target_x86_64::Scan::global(const General_options& options, | |
d61c17ea ILT |
1109 | Symbol_table* symtab, |
1110 | Layout* layout, | |
1111 | Target_x86_64* target, | |
1112 | Sized_relobj<64, false>* object, | |
1113 | unsigned int data_shndx, | |
4f4c5f80 | 1114 | Output_section* output_section, |
d61c17ea ILT |
1115 | const elfcpp::Rela<64, false>& reloc, |
1116 | unsigned int r_type, | |
1117 | Symbol* gsym) | |
2e30d253 ILT |
1118 | { |
1119 | switch (r_type) | |
1120 | { | |
1121 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1122 | case elfcpp::R_386_GNU_VTINHERIT: |
1123 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1124 | break; |
1125 | ||
1126 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1127 | case elfcpp::R_X86_64_32: |
1128 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1129 | case elfcpp::R_X86_64_16: |
2e30d253 | 1130 | case elfcpp::R_X86_64_8: |
96f2030e | 1131 | { |
d61c6bd4 ILT |
1132 | // Make a PLT entry if necessary. |
1133 | if (gsym->needs_plt_entry()) | |
1134 | { | |
1135 | target->make_plt_entry(symtab, layout, gsym); | |
1136 | // Since this is not a PC-relative relocation, we may be | |
1137 | // taking the address of a function. In that case we need to | |
1138 | // set the entry in the dynamic symbol table to the address of | |
1139 | // the PLT entry. | |
8851ecca | 1140 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1141 | gsym->set_needs_dynsym_value(); |
1142 | } | |
1143 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1144 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1145 | { |
1146 | if (target->may_need_copy_reloc(gsym)) | |
1147 | { | |
7bf1f802 ILT |
1148 | target->copy_reloc(&options, symtab, layout, object, |
1149 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 ILT |
1150 | } |
1151 | else if (r_type == elfcpp::R_X86_64_64 | |
1152 | && gsym->can_use_relative_reloc(false)) | |
1153 | { | |
1154 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1155 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1156 | output_section, object, | |
1157 | data_shndx, reloc.get_r_offset(), | |
1158 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1159 | } |
1160 | else | |
1161 | { | |
a036edd8 | 1162 | this->check_non_pic(object, r_type); |
96f2030e | 1163 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1164 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1165 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1166 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1167 | } |
1168 | } | |
1169 | } | |
1170 | break; | |
1171 | ||
1172 | case elfcpp::R_X86_64_PC64: | |
1173 | case elfcpp::R_X86_64_PC32: | |
1174 | case elfcpp::R_X86_64_PC16: | |
1175 | case elfcpp::R_X86_64_PC8: | |
1176 | { | |
1177 | // Make a PLT entry if necessary. | |
1178 | if (gsym->needs_plt_entry()) | |
1179 | target->make_plt_entry(symtab, layout, gsym); | |
1180 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1181 | int flags = Symbol::NON_PIC_REF; |
1182 | if (gsym->type() == elfcpp::STT_FUNC) | |
1183 | flags |= Symbol::FUNCTION_CALL; | |
1184 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1185 | { |
d61c6bd4 ILT |
1186 | if (target->may_need_copy_reloc(gsym)) |
1187 | { | |
7bf1f802 ILT |
1188 | target->copy_reloc(&options, symtab, layout, object, |
1189 | data_shndx, output_section, gsym, reloc); | |
d61c6bd4 | 1190 | } |
86849f1f | 1191 | else |
d61c6bd4 | 1192 | { |
a036edd8 | 1193 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1194 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1195 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1196 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1197 | reloc.get_r_addend()); |
1198 | } | |
86849f1f | 1199 | } |
d61c6bd4 | 1200 | } |
2e30d253 ILT |
1201 | break; |
1202 | ||
ff006520 | 1203 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1204 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1205 | case elfcpp::R_X86_64_GOTPCREL64: |
1206 | case elfcpp::R_X86_64_GOTPCREL: | |
1207 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1208 | { |
1209 | // The symbol requires a GOT entry. | |
1210 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1211 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1212 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1213 | else |
1214 | { | |
2e30d253 ILT |
1215 | // If this symbol is not fully resolved, we need to add a |
1216 | // dynamic relocation for it. | |
7bf1f802 | 1217 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1218 | if (gsym->is_from_dynobj() |
1219 | || gsym->is_undefined() | |
1220 | || gsym->is_preemptible()) | |
0a65a3a7 | 1221 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1222 | elfcpp::R_X86_64_GLOB_DAT); |
1223 | else | |
2e30d253 | 1224 | { |
0a65a3a7 CC |
1225 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1226 | rela_dyn->add_global_relative( | |
1227 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1228 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1229 | } |
1230 | } | |
ee9e9e86 ILT |
1231 | // For GOTPLT64, we also need a PLT entry (but only if the |
1232 | // symbol is not fully resolved). | |
1233 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1234 | && !gsym->final_value_is_known()) | |
1235 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1236 | } |
1237 | break; | |
1238 | ||
1239 | case elfcpp::R_X86_64_PLT32: | |
1240 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1241 | // Otherwise we need a PLT entry. | |
1242 | if (gsym->final_value_is_known()) | |
1243 | break; | |
96f2030e ILT |
1244 | // If building a shared library, we can also skip the PLT entry |
1245 | // if the symbol is defined in the output file and is protected | |
1246 | // or hidden. | |
1247 | if (gsym->is_defined() | |
1248 | && !gsym->is_from_dynobj() | |
1249 | && !gsym->is_preemptible()) | |
1250 | break; | |
2e30d253 ILT |
1251 | target->make_plt_entry(symtab, layout, gsym); |
1252 | break; | |
1253 | ||
fdc2f80f | 1254 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1255 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1256 | case elfcpp::R_X86_64_GOTPC64: |
1257 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1258 | // We need a GOT section. |
1259 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1260 | // For PLTOFF64, we also need a PLT entry (but only if the |
1261 | // symbol is not fully resolved). | |
1262 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1263 | && !gsym->final_value_is_known()) | |
1264 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1265 | break; |
1266 | ||
2e30d253 ILT |
1267 | case elfcpp::R_X86_64_COPY: |
1268 | case elfcpp::R_X86_64_GLOB_DAT: | |
1269 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1270 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1271 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1272 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1273 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1274 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1275 | gold_error(_("%s: unexpected reloc %u in object file"), |
1276 | object->name().c_str(), r_type); | |
2e30d253 | 1277 | break; |
2e30d253 | 1278 | |
d61c17ea | 1279 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1280 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1281 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1282 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1283 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1284 | case elfcpp::R_X86_64_DTPOFF32: |
1285 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1286 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1287 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1288 | { |
1289 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1290 | const tls::Tls_optimization optimized_type |
1291 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1292 | switch (r_type) |
1293 | { | |
56622147 | 1294 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1295 | if (optimized_type == tls::TLSOPT_NONE) |
1296 | { | |
1297 | // Create a pair of GOT entries for the module index and | |
1298 | // dtv-relative offset. | |
1299 | Output_data_got<64, false>* got | |
1300 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1301 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1302 | target->rela_dyn_section(layout), | |
1303 | elfcpp::R_X86_64_DTPMOD64, | |
1304 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1305 | } |
1306 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1307 | { | |
1308 | // Create a GOT entry for the tp-relative offset. | |
1309 | Output_data_got<64, false>* got | |
1310 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1311 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1312 | target->rela_dyn_section(layout), |
1313 | elfcpp::R_X86_64_TPOFF64); | |
1314 | } | |
1315 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1316 | unsupported_reloc_global(object, r_type, gsym); | |
1317 | break; | |
1318 | ||
56622147 ILT |
1319 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1320 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1321 | // FIXME: If not relaxing to LE, we need to generate | |
1322 | // DTPMOD64 and DTPOFF64, or TLSDESC, relocs. | |
1323 | if (optimized_type != tls::TLSOPT_TO_LE) | |
1324 | unsupported_reloc_global(object, r_type, gsym); | |
2e30d253 ILT |
1325 | break; |
1326 | ||
e041f13d | 1327 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1328 | if (optimized_type == tls::TLSOPT_NONE) |
1329 | { | |
1330 | // Create a GOT entry for the module index. | |
31d60480 | 1331 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1332 | } |
1333 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1334 | unsupported_reloc_global(object, r_type, gsym); | |
1335 | break; | |
1336 | ||
0ffd9845 ILT |
1337 | case elfcpp::R_X86_64_DTPOFF32: |
1338 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1339 | break; |
1340 | ||
56622147 | 1341 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1342 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1343 | if (optimized_type == tls::TLSOPT_NONE) |
1344 | { | |
1345 | // Create a GOT entry for the tp-relative offset. | |
1346 | Output_data_got<64, false>* got | |
1347 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1348 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1349 | target->rela_dyn_section(layout), |
1350 | elfcpp::R_X86_64_TPOFF64); | |
1351 | } | |
1352 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1353 | unsupported_reloc_global(object, r_type, gsym); |
1354 | break; | |
0ffd9845 | 1355 | |
56622147 | 1356 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1357 | layout->set_has_static_tls(); |
8851ecca | 1358 | if (parameters->options().shared()) |
7bf1f802 | 1359 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1360 | break; |
e041f13d ILT |
1361 | |
1362 | default: | |
1363 | gold_unreachable(); | |
2e30d253 ILT |
1364 | } |
1365 | } | |
1366 | break; | |
fdc2f80f ILT |
1367 | |
1368 | case elfcpp::R_X86_64_SIZE32: | |
1369 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1370 | default: |
75f2446e | 1371 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1372 | object->name().c_str(), r_type, |
1373 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1374 | break; |
1375 | } | |
1376 | } | |
1377 | ||
1378 | // Scan relocations for a section. | |
1379 | ||
1380 | void | |
1381 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1382 | Symbol_table* symtab, |
1383 | Layout* layout, | |
1384 | Sized_relobj<64, false>* object, | |
1385 | unsigned int data_shndx, | |
1386 | unsigned int sh_type, | |
1387 | const unsigned char* prelocs, | |
1388 | size_t reloc_count, | |
730cdc88 ILT |
1389 | Output_section* output_section, |
1390 | bool needs_special_offset_handling, | |
d61c17ea | 1391 | size_t local_symbol_count, |
730cdc88 | 1392 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1393 | { |
1394 | if (sh_type == elfcpp::SHT_REL) | |
1395 | { | |
75f2446e ILT |
1396 | gold_error(_("%s: unsupported REL reloc section"), |
1397 | object->name().c_str()); | |
1398 | return; | |
2e30d253 ILT |
1399 | } |
1400 | ||
1401 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1402 | Target_x86_64::Scan>( | |
1403 | options, | |
1404 | symtab, | |
1405 | layout, | |
1406 | this, | |
1407 | object, | |
1408 | data_shndx, | |
1409 | prelocs, | |
1410 | reloc_count, | |
730cdc88 ILT |
1411 | output_section, |
1412 | needs_special_offset_handling, | |
2e30d253 | 1413 | local_symbol_count, |
730cdc88 | 1414 | plocal_symbols); |
2e30d253 ILT |
1415 | } |
1416 | ||
1417 | // Finalize the sections. | |
1418 | ||
1419 | void | |
1420 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1421 | { | |
1422 | // Fill in some more dynamic tags. | |
1423 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1424 | if (odyn != NULL) | |
1425 | { | |
1426 | if (this->got_plt_ != NULL) | |
1427 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1428 | ||
1429 | if (this->plt_ != NULL) | |
1430 | { | |
1431 | const Output_data* od = this->plt_->rel_plt(); | |
1432 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1433 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1434 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
1435 | } | |
1436 | ||
0ffd9845 | 1437 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1438 | { |
0ffd9845 | 1439 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1440 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1441 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1442 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1443 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1444 | } |
1445 | ||
8851ecca | 1446 | if (!parameters->options().shared()) |
2e30d253 ILT |
1447 | { |
1448 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1449 | // linker at run time, and used by the debugger. | |
1450 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1455 | // relocs. | |
1456 | if (this->copy_relocs_ == NULL) | |
1457 | return; | |
1458 | if (this->copy_relocs_->any_to_emit()) | |
1459 | { | |
0ffd9845 ILT |
1460 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); |
1461 | this->copy_relocs_->emit(rela_dyn); | |
2e30d253 ILT |
1462 | } |
1463 | delete this->copy_relocs_; | |
1464 | this->copy_relocs_ = NULL; | |
1465 | } | |
1466 | ||
1467 | // Perform a relocation. | |
1468 | ||
1469 | inline bool | |
1470 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1471 | Target_x86_64* target, | |
1472 | size_t relnum, | |
0ffd9845 | 1473 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1474 | unsigned int r_type, |
1475 | const Sized_symbol<64>* gsym, | |
1476 | const Symbol_value<64>* psymval, | |
1477 | unsigned char* view, | |
1478 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1479 | section_size_type view_size) |
2e30d253 ILT |
1480 | { |
1481 | if (this->skip_call_tls_get_addr_) | |
1482 | { | |
1483 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1484 | || gsym == NULL | |
0ffd9845 | 1485 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1486 | { |
75f2446e ILT |
1487 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1488 | _("missing expected TLS relocation")); | |
1489 | } | |
1490 | else | |
1491 | { | |
1492 | this->skip_call_tls_get_addr_ = false; | |
1493 | return false; | |
2e30d253 | 1494 | } |
2e30d253 ILT |
1495 | } |
1496 | ||
1497 | // Pick the value to use for symbols defined in shared objects. | |
1498 | Symbol_value<64> symval; | |
96f2030e ILT |
1499 | if (gsym != NULL |
1500 | && (gsym->is_from_dynobj() | |
8851ecca | 1501 | || (parameters->options().shared() |
8fc19601 | 1502 | && (gsym->is_undefined() || gsym->is_preemptible()))) |
96f2030e | 1503 | && gsym->has_plt_offset()) |
2e30d253 ILT |
1504 | { |
1505 | symval.set_output_value(target->plt_section()->address() | |
1506 | + gsym->plt_offset()); | |
1507 | psymval = &symval; | |
1508 | } | |
1509 | ||
1510 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1511 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1512 | ||
1513 | // Get the GOT offset if needed. | |
96f2030e ILT |
1514 | // The GOT pointer points to the end of the GOT section. |
1515 | // We need to subtract the size of the GOT section to get | |
1516 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1517 | bool have_got_offset = false; |
1518 | unsigned int got_offset = 0; | |
1519 | switch (r_type) | |
1520 | { | |
1521 | case elfcpp::R_X86_64_GOT32: | |
1522 | case elfcpp::R_X86_64_GOT64: | |
1523 | case elfcpp::R_X86_64_GOTPLT64: | |
1524 | case elfcpp::R_X86_64_GOTPCREL: | |
1525 | case elfcpp::R_X86_64_GOTPCREL64: | |
1526 | if (gsym != NULL) | |
1527 | { | |
0a65a3a7 CC |
1528 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1529 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1530 | } |
1531 | else | |
1532 | { | |
1533 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1534 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1535 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1536 | - target->got_size()); | |
0ffd9845 ILT |
1537 | } |
1538 | have_got_offset = true; | |
1539 | break; | |
1540 | ||
1541 | default: | |
1542 | break; | |
1543 | } | |
2e30d253 ILT |
1544 | |
1545 | switch (r_type) | |
1546 | { | |
1547 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1548 | case elfcpp::R_386_GNU_VTINHERIT: |
1549 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1550 | break; |
1551 | ||
1552 | case elfcpp::R_X86_64_64: | |
1553 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1554 | break; | |
1555 | ||
1556 | case elfcpp::R_X86_64_PC64: | |
1557 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1558 | address); | |
1559 | break; | |
1560 | ||
1561 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1562 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1563 | // uint64_t x = value + addend; | |
1564 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1565 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1566 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1567 | break; | |
1568 | ||
1569 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1570 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1571 | // int64_t x = value + addend; // note this quantity is signed! | |
1572 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1573 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1574 | break; | |
1575 | ||
1576 | case elfcpp::R_X86_64_PC32: | |
1577 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1578 | address); | |
1579 | break; | |
1580 | ||
1581 | case elfcpp::R_X86_64_16: | |
1582 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1583 | break; | |
1584 | ||
1585 | case elfcpp::R_X86_64_PC16: | |
1586 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1587 | address); | |
1588 | break; | |
1589 | ||
1590 | case elfcpp::R_X86_64_8: | |
1591 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1592 | break; | |
1593 | ||
1594 | case elfcpp::R_X86_64_PC8: | |
1595 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1596 | address); | |
1597 | break; | |
1598 | ||
1599 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1600 | gold_assert(gsym == NULL |
1601 | || gsym->has_plt_offset() | |
99f8faca ILT |
1602 | || gsym->final_value_is_known() |
1603 | || (gsym->is_defined() | |
1604 | && !gsym->is_from_dynobj() | |
1605 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1606 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1607 | // behaves differently because psymval was set to point to | |
1608 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1609 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1610 | address); | |
1611 | break; | |
1612 | ||
ee9e9e86 ILT |
1613 | case elfcpp::R_X86_64_PLTOFF64: |
1614 | { | |
1615 | gold_assert(gsym); | |
1616 | gold_assert(gsym->has_plt_offset() | |
1617 | || gsym->final_value_is_known()); | |
1618 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1619 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1620 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1621 | addend - got_address); | |
ee9e9e86 ILT |
1622 | } |
1623 | ||
2e30d253 | 1624 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1625 | gold_assert(have_got_offset); |
1626 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1627 | break; |
1628 | ||
e822f2b1 ILT |
1629 | case elfcpp::R_X86_64_GOTPC32: |
1630 | { | |
1631 | gold_assert(gsym); | |
1632 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1633 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1634 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1635 | } | |
1636 | break; | |
1637 | ||
1638 | case elfcpp::R_X86_64_GOT64: | |
1639 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1640 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1641 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1642 | gold_assert(have_got_offset); |
1643 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1644 | break; |
1645 | ||
1646 | case elfcpp::R_X86_64_GOTPC64: | |
1647 | { | |
1648 | gold_assert(gsym); | |
1649 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1650 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1651 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1652 | } | |
1653 | break; | |
1654 | ||
2e30d253 ILT |
1655 | case elfcpp::R_X86_64_GOTOFF64: |
1656 | { | |
1657 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1658 | value = (psymval->value(object, 0) | |
96f2030e | 1659 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1660 | Relocate_functions<64, false>::rela64(view, value, addend); |
1661 | } | |
1662 | break; | |
1663 | ||
1664 | case elfcpp::R_X86_64_GOTPCREL: | |
1665 | { | |
0ffd9845 ILT |
1666 | gold_assert(have_got_offset); |
1667 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1668 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1669 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1670 | } |
1671 | break; | |
1672 | ||
e822f2b1 ILT |
1673 | case elfcpp::R_X86_64_GOTPCREL64: |
1674 | { | |
0ffd9845 ILT |
1675 | gold_assert(have_got_offset); |
1676 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1677 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1678 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1679 | } |
1680 | break; | |
1681 | ||
2e30d253 ILT |
1682 | case elfcpp::R_X86_64_COPY: |
1683 | case elfcpp::R_X86_64_GLOB_DAT: | |
1684 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1685 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1686 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1687 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1688 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1689 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1690 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1691 | _("unexpected reloc %u in object file"), | |
1692 | r_type); | |
2e30d253 ILT |
1693 | break; |
1694 | ||
d61c17ea | 1695 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1696 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1697 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1698 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1699 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1700 | case elfcpp::R_X86_64_DTPOFF32: |
1701 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1702 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1703 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1704 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1705 | view, address, view_size); | |
2e30d253 | 1706 | break; |
2e30d253 | 1707 | |
fdc2f80f ILT |
1708 | case elfcpp::R_X86_64_SIZE32: |
1709 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1710 | default: |
75f2446e ILT |
1711 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1712 | _("unsupported reloc %u"), | |
1713 | r_type); | |
2e30d253 ILT |
1714 | break; |
1715 | } | |
1716 | ||
1717 | return true; | |
1718 | } | |
1719 | ||
1720 | // Perform a TLS relocation. | |
1721 | ||
1722 | inline void | |
d61c17ea | 1723 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1724 | Target_x86_64* target, |
d61c17ea | 1725 | size_t relnum, |
72ec2876 | 1726 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1727 | unsigned int r_type, |
1728 | const Sized_symbol<64>* gsym, | |
1729 | const Symbol_value<64>* psymval, | |
1730 | unsigned char* view, | |
6a41d30b | 1731 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1732 | section_size_type view_size) |
2e30d253 | 1733 | { |
2e30d253 | 1734 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1735 | |
1736 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1737 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1738 | |
1739 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1740 | ||
1741 | const bool is_final = (gsym == NULL | |
8851ecca | 1742 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1743 | : gsym->final_value_is_known()); |
e041f13d ILT |
1744 | const tls::Tls_optimization optimized_type |
1745 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1746 | switch (r_type) |
1747 | { | |
56622147 ILT |
1748 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1749 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d ILT |
1750 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1751 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2e30d253 | 1752 | { |
7bf1f802 | 1753 | gold_assert(tls_segment != NULL); |
2e30d253 | 1754 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1755 | rela, r_type, value, view, |
2e30d253 ILT |
1756 | view_size); |
1757 | break; | |
1758 | } | |
7bf1f802 ILT |
1759 | else |
1760 | { | |
1761 | unsigned int got_offset; | |
1762 | if (gsym != NULL) | |
1763 | { | |
0a65a3a7 CC |
1764 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_PAIR)); |
1765 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_PAIR) | |
1766 | - target->got_size()); | |
7bf1f802 ILT |
1767 | } |
1768 | else | |
1769 | { | |
1770 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1771 | gold_assert(object->local_has_got_offset(r_sym, |
1772 | GOT_TYPE_TLS_PAIR)); | |
1773 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_PAIR) | |
7bf1f802 ILT |
1774 | - target->got_size()); |
1775 | } | |
1776 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1777 | { | |
1778 | gold_assert(tls_segment != NULL); | |
1779 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
1780 | got_offset, view, view_size); | |
1781 | break; | |
1782 | } | |
1783 | else if (optimized_type == tls::TLSOPT_NONE) | |
1784 | { | |
1785 | // Relocate the field with the offset of the pair of GOT | |
1786 | // entries. | |
6a41d30b ILT |
1787 | value = target->got_plt_section()->address() + got_offset; |
1788 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1789 | address); | |
7bf1f802 ILT |
1790 | break; |
1791 | } | |
1792 | } | |
72ec2876 | 1793 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1794 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1795 | break; |
1796 | ||
56622147 | 1797 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
e041f13d ILT |
1798 | if (optimized_type == tls::TLSOPT_TO_LE) |
1799 | { | |
7bf1f802 | 1800 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
1801 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
1802 | value, view, view_size); | |
1803 | break; | |
e041f13d | 1804 | } |
7bf1f802 ILT |
1805 | else if (optimized_type == tls::TLSOPT_NONE) |
1806 | { | |
1807 | // Relocate the field with the offset of the GOT entry for | |
1808 | // the module index. | |
1809 | unsigned int got_offset; | |
31d60480 ILT |
1810 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
1811 | - target->got_size()); | |
6a41d30b ILT |
1812 | value = target->got_plt_section()->address() + got_offset; |
1813 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1814 | address); | |
7bf1f802 ILT |
1815 | break; |
1816 | } | |
72ec2876 | 1817 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1818 | _("unsupported reloc %u"), r_type); |
2e30d253 | 1819 | break; |
0ffd9845 ILT |
1820 | |
1821 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 1822 | gold_assert(tls_segment != NULL); |
e041f13d | 1823 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
1824 | value -= tls_segment->memsz(); |
1825 | Relocate_functions<64, false>::rela32(view, value, 0); | |
0ffd9845 ILT |
1826 | break; |
1827 | ||
1828 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 1829 | gold_assert(tls_segment != NULL); |
e041f13d | 1830 | if (optimized_type == tls::TLSOPT_TO_LE) |
6a41d30b ILT |
1831 | value -= tls_segment->memsz(); |
1832 | Relocate_functions<64, false>::rela64(view, value, 0); | |
0ffd9845 | 1833 | break; |
2e30d253 | 1834 | |
56622147 ILT |
1835 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1836 | if (optimized_type == tls::TLSOPT_TO_LE) | |
1837 | { | |
7bf1f802 | 1838 | gold_assert(tls_segment != NULL); |
56622147 ILT |
1839 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
1840 | rela, r_type, value, view, | |
1841 | view_size); | |
1842 | break; | |
1843 | } | |
7bf1f802 ILT |
1844 | else if (optimized_type == tls::TLSOPT_NONE) |
1845 | { | |
1846 | // Relocate the field with the offset of the GOT entry for | |
1847 | // the tp-relative offset of the symbol. | |
1848 | unsigned int got_offset; | |
1849 | if (gsym != NULL) | |
1850 | { | |
0a65a3a7 CC |
1851 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
1852 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
1853 | - target->got_size()); | |
7bf1f802 ILT |
1854 | } |
1855 | else | |
1856 | { | |
1857 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1858 | gold_assert(object->local_has_got_offset(r_sym, |
1859 | GOT_TYPE_TLS_OFFSET)); | |
1860 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
1861 | - target->got_size()); |
1862 | } | |
6a41d30b ILT |
1863 | value = target->got_plt_section()->address() + got_offset; |
1864 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
1865 | break; |
1866 | } | |
56622147 ILT |
1867 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1868 | _("unsupported reloc type %u"), | |
1869 | r_type); | |
1870 | break; | |
0ffd9845 | 1871 | |
56622147 | 1872 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b ILT |
1873 | value -= tls_segment->memsz(); |
1874 | Relocate_functions<64, false>::rela32(view, value, 0); | |
56622147 | 1875 | break; |
2e30d253 | 1876 | } |
2e30d253 ILT |
1877 | } |
1878 | ||
7bf1f802 ILT |
1879 | // Do a relocation in which we convert a TLS General-Dynamic to an |
1880 | // Initial-Exec. | |
1881 | ||
1882 | inline void | |
1883 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
1884 | size_t relnum, | |
1885 | Output_segment* tls_segment, | |
1886 | const elfcpp::Rela<64, false>& rela, | |
1887 | unsigned int, | |
1888 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1889 | unsigned char* view, | |
fe8718a4 | 1890 | section_size_type view_size) |
7bf1f802 ILT |
1891 | { |
1892 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
1893 | // .word 0x6666; rex64; call __tls_get_addr | |
1894 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
1895 | ||
1896 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
1897 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
1898 | ||
1899 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1900 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1901 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1902 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
1903 | ||
1904 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
1905 | ||
6a41d30b | 1906 | value -= tls_segment->memsz(); |
7bf1f802 ILT |
1907 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
1908 | ||
1909 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1910 | // We can skip it. | |
1911 | this->skip_call_tls_get_addr_ = true; | |
1912 | } | |
1913 | ||
e041f13d | 1914 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
1915 | // Local-Exec. |
1916 | ||
1917 | inline void | |
d61c17ea ILT |
1918 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
1919 | size_t relnum, | |
1920 | Output_segment* tls_segment, | |
72ec2876 | 1921 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1922 | unsigned int, |
1923 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1924 | unsigned char* view, | |
fe8718a4 | 1925 | section_size_type view_size) |
2e30d253 | 1926 | { |
0ffd9845 ILT |
1927 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
1928 | // .word 0x6666; rex64; call __tls_get_addr | |
1929 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 1930 | |
72ec2876 ILT |
1931 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
1932 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 1933 | |
72ec2876 ILT |
1934 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1935 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
1936 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
1937 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 1938 | |
0ffd9845 | 1939 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 1940 | |
6a41d30b | 1941 | value -= tls_segment->memsz(); |
0ffd9845 | 1942 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
1943 | |
1944 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1945 | // We can skip it. | |
1946 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1947 | } |
1948 | ||
2e30d253 | 1949 | inline void |
72ec2876 ILT |
1950 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
1951 | size_t relnum, | |
1952 | Output_segment*, | |
1953 | const elfcpp::Rela<64, false>& rela, | |
1954 | unsigned int, | |
1955 | elfcpp::Elf_types<64>::Elf_Addr, | |
1956 | unsigned char* view, | |
fe8718a4 | 1957 | section_size_type view_size) |
2e30d253 | 1958 | { |
72ec2876 ILT |
1959 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
1960 | // ... leq foo@dtpoff(%rax),%reg | |
1961 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 1962 | |
72ec2876 ILT |
1963 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
1964 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 1965 | |
72ec2876 ILT |
1966 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
1967 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
1968 | ||
1969 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
1970 | ||
1971 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
1972 | ||
1973 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
1974 | // We can skip it. | |
1975 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
1976 | } |
1977 | ||
56622147 ILT |
1978 | // Do a relocation in which we convert a TLS Initial-Exec to a |
1979 | // Local-Exec. | |
1980 | ||
1981 | inline void | |
1982 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
1983 | size_t relnum, | |
1984 | Output_segment* tls_segment, | |
1985 | const elfcpp::Rela<64, false>& rela, | |
1986 | unsigned int, | |
1987 | elfcpp::Elf_types<64>::Elf_Addr value, | |
1988 | unsigned char* view, | |
fe8718a4 | 1989 | section_size_type view_size) |
56622147 ILT |
1990 | { |
1991 | // We need to examine the opcodes to figure out which instruction we | |
1992 | // are looking at. | |
1993 | ||
1994 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
1995 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
1996 | ||
1997 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
1998 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
1999 | ||
2000 | unsigned char op1 = view[-3]; | |
2001 | unsigned char op2 = view[-2]; | |
2002 | unsigned char op3 = view[-1]; | |
2003 | unsigned char reg = op3 >> 3; | |
2004 | ||
2005 | if (op2 == 0x8b) | |
2006 | { | |
2007 | // movq | |
2008 | if (op1 == 0x4c) | |
2009 | view[-3] = 0x49; | |
2010 | view[-2] = 0xc7; | |
2011 | view[-1] = 0xc0 | reg; | |
2012 | } | |
2013 | else if (reg == 4) | |
2014 | { | |
2015 | // Special handling for %rsp. | |
2016 | if (op1 == 0x4c) | |
2017 | view[-3] = 0x49; | |
2018 | view[-2] = 0x81; | |
2019 | view[-1] = 0xc0 | reg; | |
2020 | } | |
2021 | else | |
2022 | { | |
2023 | // addq | |
2024 | if (op1 == 0x4c) | |
2025 | view[-3] = 0x4d; | |
2026 | view[-2] = 0x8d; | |
2027 | view[-1] = 0x80 | reg | (reg << 3); | |
2028 | } | |
2029 | ||
6a41d30b | 2030 | value -= tls_segment->memsz(); |
56622147 ILT |
2031 | Relocate_functions<64, false>::rela32(view, value, 0); |
2032 | } | |
2033 | ||
2e30d253 ILT |
2034 | // Relocate section data. |
2035 | ||
2036 | void | |
2037 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2038 | unsigned int sh_type, |
2039 | const unsigned char* prelocs, | |
2040 | size_t reloc_count, | |
730cdc88 ILT |
2041 | Output_section* output_section, |
2042 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2043 | unsigned char* view, |
2044 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2045 | section_size_type view_size) |
2e30d253 ILT |
2046 | { |
2047 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2048 | ||
2049 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2050 | Target_x86_64::Relocate>( | |
2051 | relinfo, | |
2052 | this, | |
2053 | prelocs, | |
2054 | reloc_count, | |
730cdc88 ILT |
2055 | output_section, |
2056 | needs_special_offset_handling, | |
2e30d253 ILT |
2057 | view, |
2058 | address, | |
2059 | view_size); | |
2060 | } | |
2061 | ||
6a74a719 ILT |
2062 | // Return the size of a relocation while scanning during a relocatable |
2063 | // link. | |
2064 | ||
2065 | unsigned int | |
2066 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2067 | unsigned int r_type, | |
2068 | Relobj* object) | |
2069 | { | |
2070 | switch (r_type) | |
2071 | { | |
2072 | case elfcpp::R_X86_64_NONE: | |
2073 | case elfcpp::R_386_GNU_VTINHERIT: | |
2074 | case elfcpp::R_386_GNU_VTENTRY: | |
2075 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2076 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2077 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2078 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2079 | case elfcpp::R_X86_64_DTPOFF32: | |
2080 | case elfcpp::R_X86_64_DTPOFF64: | |
2081 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2082 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2083 | return 0; | |
2084 | ||
2085 | case elfcpp::R_X86_64_64: | |
2086 | case elfcpp::R_X86_64_PC64: | |
2087 | case elfcpp::R_X86_64_GOTOFF64: | |
2088 | case elfcpp::R_X86_64_GOTPC64: | |
2089 | case elfcpp::R_X86_64_PLTOFF64: | |
2090 | case elfcpp::R_X86_64_GOT64: | |
2091 | case elfcpp::R_X86_64_GOTPCREL64: | |
2092 | case elfcpp::R_X86_64_GOTPCREL: | |
2093 | case elfcpp::R_X86_64_GOTPLT64: | |
2094 | return 8; | |
2095 | ||
2096 | case elfcpp::R_X86_64_32: | |
2097 | case elfcpp::R_X86_64_32S: | |
2098 | case elfcpp::R_X86_64_PC32: | |
2099 | case elfcpp::R_X86_64_PLT32: | |
2100 | case elfcpp::R_X86_64_GOTPC32: | |
2101 | case elfcpp::R_X86_64_GOT32: | |
2102 | return 4; | |
2103 | ||
2104 | case elfcpp::R_X86_64_16: | |
2105 | case elfcpp::R_X86_64_PC16: | |
2106 | return 2; | |
2107 | ||
2108 | case elfcpp::R_X86_64_8: | |
2109 | case elfcpp::R_X86_64_PC8: | |
2110 | return 1; | |
2111 | ||
2112 | case elfcpp::R_X86_64_COPY: | |
2113 | case elfcpp::R_X86_64_GLOB_DAT: | |
2114 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2115 | case elfcpp::R_X86_64_RELATIVE: | |
2116 | // These are outstanding tls relocs, which are unexpected when linking | |
2117 | case elfcpp::R_X86_64_TPOFF64: | |
2118 | case elfcpp::R_X86_64_DTPMOD64: | |
2119 | case elfcpp::R_X86_64_TLSDESC: | |
2120 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2121 | return 0; | |
2122 | ||
2123 | case elfcpp::R_X86_64_SIZE32: | |
2124 | case elfcpp::R_X86_64_SIZE64: | |
2125 | default: | |
2126 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2127 | return 0; | |
2128 | } | |
2129 | } | |
2130 | ||
2131 | // Scan the relocs during a relocatable link. | |
2132 | ||
2133 | void | |
2134 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2135 | Symbol_table* symtab, | |
2136 | Layout* layout, | |
2137 | Sized_relobj<64, false>* object, | |
2138 | unsigned int data_shndx, | |
2139 | unsigned int sh_type, | |
2140 | const unsigned char* prelocs, | |
2141 | size_t reloc_count, | |
2142 | Output_section* output_section, | |
2143 | bool needs_special_offset_handling, | |
2144 | size_t local_symbol_count, | |
2145 | const unsigned char* plocal_symbols, | |
2146 | Relocatable_relocs* rr) | |
2147 | { | |
2148 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2149 | ||
2150 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2151 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2152 | ||
7019cd25 | 2153 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2154 | Scan_relocatable_relocs>( |
2155 | options, | |
2156 | symtab, | |
2157 | layout, | |
2158 | object, | |
2159 | data_shndx, | |
2160 | prelocs, | |
2161 | reloc_count, | |
2162 | output_section, | |
2163 | needs_special_offset_handling, | |
2164 | local_symbol_count, | |
2165 | plocal_symbols, | |
2166 | rr); | |
2167 | } | |
2168 | ||
2169 | // Relocate a section during a relocatable link. | |
2170 | ||
2171 | void | |
2172 | Target_x86_64::relocate_for_relocatable( | |
2173 | const Relocate_info<64, false>* relinfo, | |
2174 | unsigned int sh_type, | |
2175 | const unsigned char* prelocs, | |
2176 | size_t reloc_count, | |
2177 | Output_section* output_section, | |
2178 | off_t offset_in_output_section, | |
2179 | const Relocatable_relocs* rr, | |
2180 | unsigned char* view, | |
2181 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2182 | section_size_type view_size, | |
2183 | unsigned char* reloc_view, | |
2184 | section_size_type reloc_view_size) | |
2185 | { | |
2186 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2187 | ||
7019cd25 | 2188 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2189 | relinfo, |
2190 | prelocs, | |
2191 | reloc_count, | |
2192 | output_section, | |
2193 | offset_in_output_section, | |
2194 | rr, | |
2195 | view, | |
2196 | view_address, | |
2197 | view_size, | |
2198 | reloc_view, | |
2199 | reloc_view_size); | |
2200 | } | |
2201 | ||
4fb6c25d ILT |
2202 | // Return the value to use for a dynamic which requires special |
2203 | // treatment. This is how we support equality comparisons of function | |
2204 | // pointers across shared library boundaries, as described in the | |
2205 | // processor specific ABI supplement. | |
2206 | ||
2207 | uint64_t | |
2208 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2209 | { | |
2210 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2211 | return this->plt_section()->address() + gsym->plt_offset(); | |
2212 | } | |
2213 | ||
2e30d253 ILT |
2214 | // Return a string used to fill a code section with nops to take up |
2215 | // the specified length. | |
2216 | ||
2217 | std::string | |
8851ecca | 2218 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2219 | { |
2220 | if (length >= 16) | |
2221 | { | |
2222 | // Build a jmpq instruction to skip over the bytes. | |
2223 | unsigned char jmp[5]; | |
2224 | jmp[0] = 0xe9; | |
04bf7072 | 2225 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2226 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2227 | + std::string(length - 5, '\0')); | |
2228 | } | |
2229 | ||
2230 | // Nop sequences of various lengths. | |
2231 | const char nop1[1] = { 0x90 }; // nop | |
2232 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2233 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2234 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2235 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2236 | 0x00 }; // leal 0(%esi,1),%esi | |
2237 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2238 | 0x00, 0x00 }; | |
2239 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2240 | 0x00, 0x00, 0x00 }; | |
2241 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2242 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2243 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2244 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2245 | 0x00 }; | |
2246 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2247 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2248 | 0x00, 0x00 }; | |
2249 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2250 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2251 | 0x00, 0x00, 0x00 }; | |
2252 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2253 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2254 | 0x00, 0x00, 0x00, 0x00 }; | |
2255 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2256 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2257 | 0x27, 0x00, 0x00, 0x00, | |
2258 | 0x00 }; | |
2259 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2260 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2261 | 0xbc, 0x27, 0x00, 0x00, | |
2262 | 0x00, 0x00 }; | |
2263 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2264 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2265 | 0x90, 0x90, 0x90, 0x90, | |
2266 | 0x90, 0x90, 0x90 }; | |
2267 | ||
2268 | const char* nops[16] = { | |
2269 | NULL, | |
2270 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2271 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2272 | }; | |
2273 | ||
2274 | return std::string(nops[length], length); | |
2275 | } | |
2276 | ||
2277 | // The selector for x86_64 object files. | |
2278 | ||
2279 | class Target_selector_x86_64 : public Target_selector | |
2280 | { | |
2281 | public: | |
2282 | Target_selector_x86_64() | |
e96caa79 | 2283 | : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64") |
2e30d253 ILT |
2284 | { } |
2285 | ||
2286 | Target* | |
e96caa79 ILT |
2287 | do_instantiate_target() |
2288 | { return new Target_x86_64(); } | |
2e30d253 ILT |
2289 | }; |
2290 | ||
2e30d253 ILT |
2291 | Target_selector_x86_64 target_selector_x86_64; |
2292 | ||
2293 | } // End anonymous namespace. |