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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
a8df5856 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
2e30d253 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8b105e34 ILT |
8 | // This program is free software; you can redistribute it and/or modify |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
2e30d253 ILT |
11 | // (at your option) any later version. |
12 | ||
8b105e34 ILT |
13 | // This program is distributed in the hope that it will be useful, |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
2e30d253 ILT |
22 | |
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
26 | ||
27 | #include "elfcpp.h" | |
28 | #include "parameters.h" | |
29 | #include "reloc.h" | |
30 | #include "x86_64.h" | |
31 | #include "object.h" | |
32 | #include "symtab.h" | |
33 | #include "layout.h" | |
34 | #include "output.h" | |
12c0daef | 35 | #include "copy-relocs.h" |
2e30d253 ILT |
36 | #include "target.h" |
37 | #include "target-reloc.h" | |
38 | #include "target-select.h" | |
e041f13d | 39 | #include "tls.h" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
21bb3914 | 42 | #include "icf.h" |
2e30d253 ILT |
43 | |
44 | namespace | |
45 | { | |
46 | ||
47 | using namespace gold; | |
48 | ||
49 | class Output_data_plt_x86_64; | |
50 | ||
51 | // The x86_64 target class. | |
d61c17ea ILT |
52 | // See the ABI at |
53 | // http://www.x86-64.org/documentation/abi.pdf | |
54 | // TLS info comes from | |
55 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 56 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 57 | |
36959681 | 58 | class Target_x86_64 : public Target_freebsd<64, false> |
2e30d253 ILT |
59 | { |
60 | public: | |
e822f2b1 ILT |
61 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
62 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
63 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
64 | ||
65 | Target_x86_64() | |
36959681 | 66 | : Target_freebsd<64, false>(&x86_64_info), |
a8df5856 ILT |
67 | got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL), |
68 | global_offset_table_(NULL), rela_dyn_(NULL), | |
69 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), | |
e291e7b9 ILT |
70 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
71 | tls_base_symbol_defined_(false) | |
2e30d253 ILT |
72 | { } |
73 | ||
21bb3914 ST |
74 | // This function should be defined in targets that can use relocation |
75 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
76 | // and global_reloc_may_be_function_pointer) | |
77 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
78 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
79 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
80 | inline bool | |
81 | can_check_for_function_pointers() const | |
82 | { return !parameters->options().pie(); } | |
83 | ||
8a5e3e08 ILT |
84 | // Hook for a new output section. |
85 | void | |
86 | do_new_output_section(Output_section*) const; | |
87 | ||
6d03d481 ST |
88 | // Scan the relocations to look for symbol adjustments. |
89 | void | |
ad0f2072 | 90 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
91 | Layout* layout, |
92 | Sized_relobj<64, false>* object, | |
93 | unsigned int data_shndx, | |
94 | unsigned int sh_type, | |
95 | const unsigned char* prelocs, | |
96 | size_t reloc_count, | |
97 | Output_section* output_section, | |
98 | bool needs_special_offset_handling, | |
99 | size_t local_symbol_count, | |
100 | const unsigned char* plocal_symbols); | |
101 | ||
2e30d253 ILT |
102 | // Scan the relocations to look for symbol adjustments. |
103 | void | |
ad0f2072 | 104 | scan_relocs(Symbol_table* symtab, |
2e30d253 ILT |
105 | Layout* layout, |
106 | Sized_relobj<64, false>* object, | |
107 | unsigned int data_shndx, | |
108 | unsigned int sh_type, | |
109 | const unsigned char* prelocs, | |
110 | size_t reloc_count, | |
730cdc88 ILT |
111 | Output_section* output_section, |
112 | bool needs_special_offset_handling, | |
2e30d253 | 113 | size_t local_symbol_count, |
730cdc88 | 114 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
115 | |
116 | // Finalize the sections. | |
117 | void | |
f59f41f3 | 118 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 119 | |
4fb6c25d ILT |
120 | // Return the value to use for a dynamic which requires special |
121 | // treatment. | |
122 | uint64_t | |
123 | do_dynsym_value(const Symbol*) const; | |
124 | ||
2e30d253 ILT |
125 | // Relocate a section. |
126 | void | |
127 | relocate_section(const Relocate_info<64, false>*, | |
128 | unsigned int sh_type, | |
129 | const unsigned char* prelocs, | |
130 | size_t reloc_count, | |
730cdc88 ILT |
131 | Output_section* output_section, |
132 | bool needs_special_offset_handling, | |
2e30d253 ILT |
133 | unsigned char* view, |
134 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
135 | section_size_type view_size, |
136 | const Reloc_symbol_changes*); | |
2e30d253 | 137 | |
6a74a719 ILT |
138 | // Scan the relocs during a relocatable link. |
139 | void | |
ad0f2072 | 140 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
141 | Layout* layout, |
142 | Sized_relobj<64, false>* object, | |
143 | unsigned int data_shndx, | |
144 | unsigned int sh_type, | |
145 | const unsigned char* prelocs, | |
146 | size_t reloc_count, | |
147 | Output_section* output_section, | |
148 | bool needs_special_offset_handling, | |
149 | size_t local_symbol_count, | |
150 | const unsigned char* plocal_symbols, | |
151 | Relocatable_relocs*); | |
152 | ||
153 | // Relocate a section during a relocatable link. | |
154 | void | |
155 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
156 | unsigned int sh_type, | |
157 | const unsigned char* prelocs, | |
158 | size_t reloc_count, | |
159 | Output_section* output_section, | |
160 | off_t offset_in_output_section, | |
161 | const Relocatable_relocs*, | |
162 | unsigned char* view, | |
163 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
164 | section_size_type view_size, | |
165 | unsigned char* reloc_view, | |
166 | section_size_type reloc_view_size); | |
167 | ||
2e30d253 ILT |
168 | // Return a string used to fill a code section with nops. |
169 | std::string | |
8851ecca | 170 | do_code_fill(section_size_type length) const; |
2e30d253 | 171 | |
9a2d6984 ILT |
172 | // Return whether SYM is defined by the ABI. |
173 | bool | |
9c2d0ef9 | 174 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
175 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
176 | ||
e291e7b9 ILT |
177 | // Return the symbol index to use for a target specific relocation. |
178 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
179 | // local symbol, which is an absolute reloc. | |
180 | unsigned int | |
181 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
182 | { | |
183 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
184 | return 0; | |
185 | } | |
186 | ||
187 | // Return the addend to use for a target specific relocation. | |
188 | uint64_t | |
189 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
190 | ||
364c7fa5 ILT |
191 | // Adjust -fstack-split code which calls non-stack-split code. |
192 | void | |
193 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
194 | section_offset_type fnoffset, section_size_type fnsize, | |
195 | unsigned char* view, section_size_type view_size, | |
196 | std::string* from, std::string* to) const; | |
197 | ||
96f2030e | 198 | // Return the size of the GOT section. |
fe8718a4 | 199 | section_size_type |
0e70b911 | 200 | got_size() const |
96f2030e ILT |
201 | { |
202 | gold_assert(this->got_ != NULL); | |
203 | return this->got_->data_size(); | |
204 | } | |
205 | ||
0e70b911 CC |
206 | // Return the number of entries in the GOT. |
207 | unsigned int | |
208 | got_entry_count() const | |
209 | { | |
210 | if (this->got_ == NULL) | |
211 | return 0; | |
212 | return this->got_size() / 8; | |
213 | } | |
214 | ||
215 | // Return the number of entries in the PLT. | |
216 | unsigned int | |
217 | plt_entry_count() const; | |
218 | ||
219 | // Return the offset of the first non-reserved PLT entry. | |
220 | unsigned int | |
221 | first_plt_entry_offset() const; | |
222 | ||
223 | // Return the size of each PLT entry. | |
224 | unsigned int | |
225 | plt_entry_size() const; | |
226 | ||
e291e7b9 ILT |
227 | // Add a new reloc argument, returning the index in the vector. |
228 | size_t | |
229 | add_tlsdesc_info(Sized_relobj<64, false>* object, unsigned int r_sym) | |
230 | { | |
231 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
232 | return this->tlsdesc_reloc_info_.size() - 1; | |
233 | } | |
234 | ||
2e30d253 ILT |
235 | private: |
236 | // The class which scans relocations. | |
a036edd8 | 237 | class Scan |
2e30d253 | 238 | { |
a036edd8 ILT |
239 | public: |
240 | Scan() | |
241 | : issued_non_pic_error_(false) | |
242 | { } | |
243 | ||
2e30d253 | 244 | inline void |
ad0f2072 | 245 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
246 | Sized_relobj<64, false>* object, |
247 | unsigned int data_shndx, | |
07f397ab | 248 | Output_section* output_section, |
2e30d253 ILT |
249 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
250 | const elfcpp::Sym<64, false>& lsym); | |
251 | ||
252 | inline void | |
ad0f2072 | 253 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
254 | Sized_relobj<64, false>* object, |
255 | unsigned int data_shndx, | |
07f397ab | 256 | Output_section* output_section, |
2e30d253 ILT |
257 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
258 | Symbol* gsym); | |
e041f13d | 259 | |
21bb3914 ST |
260 | inline bool |
261 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
262 | Target_x86_64* target, | |
263 | Sized_relobj<64, false>* object, | |
264 | unsigned int data_shndx, | |
265 | Output_section* output_section, | |
266 | const elfcpp::Rela<64, false>& reloc, | |
267 | unsigned int r_type, | |
268 | const elfcpp::Sym<64, false>& lsym); | |
269 | ||
270 | inline bool | |
271 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
272 | Target_x86_64* target, | |
273 | Sized_relobj<64, false>* object, | |
274 | unsigned int data_shndx, | |
275 | Output_section* output_section, | |
276 | const elfcpp::Rela<64, false>& reloc, | |
277 | unsigned int r_type, | |
278 | Symbol* gsym); | |
279 | ||
a036edd8 | 280 | private: |
e041f13d ILT |
281 | static void |
282 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
283 | ||
284 | static void | |
285 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
286 | Symbol*); | |
a036edd8 ILT |
287 | |
288 | void | |
289 | check_non_pic(Relobj*, unsigned int r_type); | |
290 | ||
21bb3914 ST |
291 | inline bool |
292 | possible_function_pointer_reloc(unsigned int r_type); | |
293 | ||
a036edd8 ILT |
294 | // Whether we have issued an error about a non-PIC compilation. |
295 | bool issued_non_pic_error_; | |
2e30d253 ILT |
296 | }; |
297 | ||
298 | // The class which implements relocation. | |
299 | class Relocate | |
300 | { | |
301 | public: | |
302 | Relocate() | |
497897f9 | 303 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
304 | { } |
305 | ||
306 | ~Relocate() | |
307 | { | |
308 | if (this->skip_call_tls_get_addr_) | |
309 | { | |
310 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 311 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
312 | } |
313 | } | |
314 | ||
315 | // Do a relocation. Return false if the caller should not issue | |
316 | // any warnings about this relocation. | |
317 | inline bool | |
031cdbed ILT |
318 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
319 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
320 | unsigned int r_type, const Sized_symbol<64>*, |
321 | const Symbol_value<64>*, | |
322 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 323 | section_size_type); |
2e30d253 ILT |
324 | |
325 | private: | |
326 | // Do a TLS relocation. | |
327 | inline void | |
7bf1f802 ILT |
328 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
329 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
330 | unsigned int r_type, const Sized_symbol<64>*, |
331 | const Symbol_value<64>*, | |
fe8718a4 ILT |
332 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
333 | section_size_type); | |
2e30d253 | 334 | |
c2b45e22 | 335 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
336 | inline void |
337 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
338 | Output_segment* tls_segment, | |
339 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
340 | elfcpp::Elf_types<64>::Elf_Addr value, | |
341 | unsigned char* view, | |
c2b45e22 | 342 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 343 | section_size_type view_size); |
7bf1f802 | 344 | |
56622147 ILT |
345 | // Do a TLS General-Dynamic to Local-Exec transition. |
346 | inline void | |
347 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
348 | Output_segment* tls_segment, |
349 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
350 | elfcpp::Elf_types<64>::Elf_Addr value, | |
351 | unsigned char* view, | |
fe8718a4 | 352 | section_size_type view_size); |
2e30d253 | 353 | |
c2b45e22 CC |
354 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
355 | inline void | |
356 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
357 | Output_segment* tls_segment, | |
358 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
359 | elfcpp::Elf_types<64>::Elf_Addr value, | |
360 | unsigned char* view, | |
361 | elfcpp::Elf_types<64>::Elf_Addr, | |
362 | section_size_type view_size); | |
363 | ||
364 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
365 | inline void | |
366 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
367 | Output_segment* tls_segment, | |
368 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
369 | elfcpp::Elf_types<64>::Elf_Addr value, | |
370 | unsigned char* view, | |
371 | section_size_type view_size); | |
372 | ||
56622147 | 373 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 374 | inline void |
56622147 | 375 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
376 | Output_segment* tls_segment, |
377 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
378 | elfcpp::Elf_types<64>::Elf_Addr value, | |
379 | unsigned char* view, | |
fe8718a4 | 380 | section_size_type view_size); |
2e30d253 | 381 | |
56622147 ILT |
382 | // Do a TLS Initial-Exec to Local-Exec transition. |
383 | static inline void | |
384 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
385 | Output_segment* tls_segment, |
386 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
387 | elfcpp::Elf_types<64>::Elf_Addr value, | |
388 | unsigned char* view, | |
fe8718a4 | 389 | section_size_type view_size); |
2e30d253 ILT |
390 | |
391 | // This is set if we should skip the next reloc, which should be a | |
392 | // PLT32 reloc against ___tls_get_addr. | |
393 | bool skip_call_tls_get_addr_; | |
497897f9 ILT |
394 | |
395 | // This is set if we see a relocation which could load the address | |
396 | // of the TLS block. Whether we see such a relocation determines | |
397 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
398 | // in debugging sections. | |
399 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
400 | }; |
401 | ||
6a74a719 ILT |
402 | // A class which returns the size required for a relocation type, |
403 | // used while scanning relocs during a relocatable link. | |
404 | class Relocatable_size_for_reloc | |
405 | { | |
406 | public: | |
407 | unsigned int | |
408 | get_size_for_reloc(unsigned int, Relobj*); | |
409 | }; | |
410 | ||
2e30d253 ILT |
411 | // Adjust TLS relocation type based on the options and whether this |
412 | // is a local symbol. | |
e041f13d | 413 | static tls::Tls_optimization |
2e30d253 ILT |
414 | optimize_tls_reloc(bool is_final, int r_type); |
415 | ||
416 | // Get the GOT section, creating it if necessary. | |
417 | Output_data_got<64, false>* | |
418 | got_section(Symbol_table*, Layout*); | |
419 | ||
96f2030e ILT |
420 | // Get the GOT PLT section. |
421 | Output_data_space* | |
422 | got_plt_section() const | |
423 | { | |
424 | gold_assert(this->got_plt_ != NULL); | |
425 | return this->got_plt_; | |
426 | } | |
427 | ||
a8df5856 ILT |
428 | // Get the GOT section for TLSDESC entries. |
429 | Output_data_got<64, false>* | |
430 | got_tlsdesc_section() const | |
431 | { | |
432 | gold_assert(this->got_tlsdesc_ != NULL); | |
433 | return this->got_tlsdesc_; | |
434 | } | |
435 | ||
c2b45e22 CC |
436 | // Create the PLT section. |
437 | void | |
438 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
439 | ||
2e30d253 ILT |
440 | // Create a PLT entry for a global symbol. |
441 | void | |
442 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
443 | ||
9fa33bee | 444 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
445 | void |
446 | define_tls_base_symbol(Symbol_table*, Layout*); | |
447 | ||
c2b45e22 CC |
448 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
449 | void | |
450 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
451 | ||
31d60480 ILT |
452 | // Create a GOT entry for the TLS module index. |
453 | unsigned int | |
454 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
455 | Sized_relobj<64, false>* object); | |
456 | ||
2e30d253 ILT |
457 | // Get the PLT section. |
458 | Output_data_plt_x86_64* | |
459 | plt_section() const | |
460 | { | |
461 | gold_assert(this->plt_ != NULL); | |
462 | return this->plt_; | |
463 | } | |
464 | ||
465 | // Get the dynamic reloc section, creating it if necessary. | |
466 | Reloc_section* | |
0ffd9845 | 467 | rela_dyn_section(Layout*); |
2e30d253 | 468 | |
e291e7b9 ILT |
469 | // Get the section to use for TLSDESC relocations. |
470 | Reloc_section* | |
471 | rela_tlsdesc_section(Layout*) const; | |
472 | ||
12c0daef | 473 | // Add a potential copy relocation. |
2e30d253 | 474 | void |
ef9beddf ILT |
475 | copy_reloc(Symbol_table* symtab, Layout* layout, |
476 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
477 | unsigned int shndx, Output_section* output_section, |
478 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
479 | { | |
480 | this->copy_relocs_.copy_reloc(symtab, layout, | |
481 | symtab->get_sized_symbol<64>(sym), | |
482 | object, shndx, output_section, | |
483 | reloc, this->rela_dyn_section(layout)); | |
484 | } | |
2e30d253 ILT |
485 | |
486 | // Information about this specific target which we pass to the | |
487 | // general Target structure. | |
488 | static const Target::Target_info x86_64_info; | |
489 | ||
0e70b911 CC |
490 | // The types of GOT entries needed for this platform. |
491 | // These values are exposed to the ABI in an incremental link. | |
492 | // Do not renumber existing values without changing the version | |
493 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
494 | enum Got_type |
495 | { | |
496 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
497 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
498 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
499 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
500 | }; | |
501 | ||
e291e7b9 ILT |
502 | // This type is used as the argument to the target specific |
503 | // relocation routines. The only target specific reloc is | |
504 | // R_X86_64_TLSDESC against a local symbol. | |
505 | struct Tlsdesc_info | |
506 | { | |
507 | Tlsdesc_info(Sized_relobj<64, false>* a_object, unsigned int a_r_sym) | |
508 | : object(a_object), r_sym(a_r_sym) | |
509 | { } | |
510 | ||
511 | // The object in which the local symbol is defined. | |
512 | Sized_relobj<64, false>* object; | |
513 | // The local symbol index in the object. | |
514 | unsigned int r_sym; | |
515 | }; | |
516 | ||
2e30d253 ILT |
517 | // The GOT section. |
518 | Output_data_got<64, false>* got_; | |
519 | // The PLT section. | |
520 | Output_data_plt_x86_64* plt_; | |
521 | // The GOT PLT section. | |
522 | Output_data_space* got_plt_; | |
a8df5856 ILT |
523 | // The GOT section for TLSDESC relocations. |
524 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
525 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
526 | Symbol* global_offset_table_; | |
2e30d253 | 527 | // The dynamic reloc section. |
0ffd9845 | 528 | Reloc_section* rela_dyn_; |
2e30d253 | 529 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 530 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
531 | // Space for variables copied with a COPY reloc. |
532 | Output_data_space* dynbss_; | |
c2b45e22 | 533 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 534 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
535 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
536 | // specific relocation. Here we store the object and local symbol | |
537 | // index for the relocation. | |
538 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
539 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
540 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
541 | }; |
542 | ||
543 | const Target::Target_info Target_x86_64::x86_64_info = | |
544 | { | |
545 | 64, // size | |
546 | false, // is_big_endian | |
547 | elfcpp::EM_X86_64, // machine_code | |
548 | false, // has_make_symbol | |
549 | false, // has_resolve | |
550 | true, // has_code_fill | |
35cdfc9a | 551 | true, // is_default_stack_executable |
0864d551 | 552 | '\0', // wrap_char |
2e30d253 | 553 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 554 | 0x400000, // default_text_segment_address |
cd72c291 | 555 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
556 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
557 | elfcpp::SHN_UNDEF, // small_common_shndx | |
558 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
559 | 0, // small_common_section_flags | |
05a352e6 DK |
560 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
561 | NULL, // attributes_section | |
562 | NULL // attributes_vendor | |
2e30d253 ILT |
563 | }; |
564 | ||
8a5e3e08 ILT |
565 | // This is called when a new output section is created. This is where |
566 | // we handle the SHF_X86_64_LARGE. | |
567 | ||
568 | void | |
569 | Target_x86_64::do_new_output_section(Output_section *os) const | |
570 | { | |
571 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
572 | os->set_is_large_section(); | |
573 | } | |
574 | ||
2e30d253 ILT |
575 | // Get the GOT section, creating it if necessary. |
576 | ||
577 | Output_data_got<64, false>* | |
578 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
579 | { | |
580 | if (this->got_ == NULL) | |
581 | { | |
582 | gold_assert(symtab != NULL && layout != NULL); | |
583 | ||
584 | this->got_ = new Output_data_got<64, false>(); | |
585 | ||
82742395 ILT |
586 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
587 | (elfcpp::SHF_ALLOC | |
588 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
589 | this->got_, ORDER_RELRO_LAST, |
590 | true); | |
2e30d253 | 591 | |
7d9e3d98 | 592 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
593 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
594 | (elfcpp::SHF_ALLOC | |
595 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
596 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
597 | false); | |
2e30d253 ILT |
598 | |
599 | // The first three entries are reserved. | |
27bc2bce | 600 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 601 | |
1a2dff53 ILT |
602 | // Those bytes can go into the relro segment. |
603 | layout->increase_relro(3 * 8); | |
604 | ||
2e30d253 | 605 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
606 | this->global_offset_table_ = |
607 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
608 | Symbol_table::PREDEFINED, | |
609 | this->got_plt_, | |
610 | 0, 0, elfcpp::STT_OBJECT, | |
611 | elfcpp::STB_LOCAL, | |
612 | elfcpp::STV_HIDDEN, 0, | |
613 | false, false); | |
a8df5856 ILT |
614 | |
615 | // If there are any TLSDESC relocations, they get GOT entries in | |
616 | // .got.plt after the jump slot entries. | |
617 | this->got_tlsdesc_ = new Output_data_got<64, false>(); | |
618 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
619 | (elfcpp::SHF_ALLOC | |
620 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
621 | this->got_tlsdesc_, |
622 | ORDER_NON_RELRO_FIRST, false); | |
2e30d253 ILT |
623 | } |
624 | ||
625 | return this->got_; | |
626 | } | |
627 | ||
628 | // Get the dynamic reloc section, creating it if necessary. | |
629 | ||
630 | Target_x86_64::Reloc_section* | |
0ffd9845 | 631 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 632 | { |
0ffd9845 | 633 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
634 | { |
635 | gold_assert(layout != NULL); | |
d98bc257 | 636 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 637 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
638 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
639 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 640 | } |
0ffd9845 | 641 | return this->rela_dyn_; |
2e30d253 ILT |
642 | } |
643 | ||
644 | // A class to handle the PLT data. | |
645 | ||
646 | class Output_data_plt_x86_64 : public Output_section_data | |
647 | { | |
648 | public: | |
649 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
650 | ||
c2b45e22 CC |
651 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
652 | Output_data_space*); | |
2e30d253 ILT |
653 | |
654 | // Add an entry to the PLT. | |
655 | void | |
656 | add_entry(Symbol* gsym); | |
657 | ||
c2b45e22 CC |
658 | // Add the reserved TLSDESC_PLT entry to the PLT. |
659 | void | |
660 | reserve_tlsdesc_entry(unsigned int got_offset) | |
661 | { this->tlsdesc_got_offset_ = got_offset; } | |
662 | ||
663 | // Return true if a TLSDESC_PLT entry has been reserved. | |
664 | bool | |
665 | has_tlsdesc_entry() const | |
666 | { return this->tlsdesc_got_offset_ != -1U; } | |
667 | ||
668 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
669 | unsigned int | |
670 | get_tlsdesc_got_offset() const | |
671 | { return this->tlsdesc_got_offset_; } | |
672 | ||
673 | // Return the offset of the reserved TLSDESC_PLT entry. | |
674 | unsigned int | |
675 | get_tlsdesc_plt_offset() const | |
676 | { return (this->count_ + 1) * plt_entry_size; } | |
677 | ||
e291e7b9 | 678 | // Return the .rela.plt section data. |
2e30d253 | 679 | const Reloc_section* |
e291e7b9 | 680 | rela_plt() const |
2e30d253 ILT |
681 | { return this->rel_; } |
682 | ||
e291e7b9 ILT |
683 | // Return where the TLSDESC relocations should go. |
684 | Reloc_section* | |
685 | rela_tlsdesc(Layout*); | |
686 | ||
0e70b911 CC |
687 | // Return the number of PLT entries. |
688 | unsigned int | |
689 | entry_count() const | |
690 | { return this->count_; } | |
691 | ||
692 | // Return the offset of the first non-reserved PLT entry. | |
693 | static unsigned int | |
694 | first_plt_entry_offset() | |
695 | { return plt_entry_size; } | |
696 | ||
697 | // Return the size of a PLT entry. | |
698 | static unsigned int | |
699 | get_plt_entry_size() | |
700 | { return plt_entry_size; } | |
701 | ||
2e30d253 ILT |
702 | protected: |
703 | void | |
704 | do_adjust_output_section(Output_section* os); | |
705 | ||
7d9e3d98 ILT |
706 | // Write to a map file. |
707 | void | |
708 | do_print_to_mapfile(Mapfile* mapfile) const | |
709 | { mapfile->print_output_data(this, _("** PLT")); } | |
710 | ||
2e30d253 ILT |
711 | private: |
712 | // The size of an entry in the PLT. | |
713 | static const int plt_entry_size = 16; | |
714 | ||
715 | // The first entry in the PLT. | |
716 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
717 | // procedure linkage table for both programs and shared objects." | |
718 | static unsigned char first_plt_entry[plt_entry_size]; | |
719 | ||
720 | // Other entries in the PLT for an executable. | |
721 | static unsigned char plt_entry[plt_entry_size]; | |
722 | ||
c2b45e22 CC |
723 | // The reserved TLSDESC entry in the PLT for an executable. |
724 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
725 | ||
2e30d253 ILT |
726 | // Set the final size. |
727 | void | |
c2b45e22 | 728 | set_final_data_size(); |
2e30d253 ILT |
729 | |
730 | // Write out the PLT data. | |
731 | void | |
732 | do_write(Output_file*); | |
733 | ||
734 | // The reloc section. | |
735 | Reloc_section* rel_; | |
e291e7b9 ILT |
736 | // The TLSDESC relocs, if necessary. These must follow the regular |
737 | // PLT relocs. | |
738 | Reloc_section* tlsdesc_rel_; | |
c2b45e22 CC |
739 | // The .got section. |
740 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
741 | // The .got.plt section. |
742 | Output_data_space* got_plt_; | |
743 | // The number of PLT entries. | |
744 | unsigned int count_; | |
c2b45e22 CC |
745 | // Offset of the reserved TLSDESC_GOT entry when needed. |
746 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
747 | }; |
748 | ||
749 | // Create the PLT section. The ordinary .got section is an argument, | |
750 | // since we need to refer to the start. We also create our own .got | |
751 | // section just for PLT entries. | |
752 | ||
753 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 754 | Output_data_got<64, false>* got, |
2e30d253 | 755 | Output_data_space* got_plt) |
e291e7b9 ILT |
756 | : Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), |
757 | count_(0), tlsdesc_got_offset_(-1U) | |
2e30d253 | 758 | { |
d98bc257 | 759 | this->rel_ = new Reloc_section(false); |
2e30d253 | 760 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
761 | elfcpp::SHF_ALLOC, this->rel_, |
762 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2e30d253 ILT |
763 | } |
764 | ||
765 | void | |
766 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
767 | { | |
b0481b0b | 768 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
769 | } |
770 | ||
771 | // Add an entry to the PLT. | |
772 | ||
773 | void | |
774 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
775 | { | |
776 | gold_assert(!gsym->has_plt_offset()); | |
777 | ||
778 | // Note that when setting the PLT offset we skip the initial | |
779 | // reserved PLT entry. | |
780 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
781 | ||
782 | ++this->count_; | |
783 | ||
fe8718a4 | 784 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
785 | |
786 | // Every PLT entry needs a GOT entry which points back to the PLT | |
787 | // entry (this will be changed by the dynamic linker, normally | |
788 | // lazily when the function is called). | |
27bc2bce | 789 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
790 | |
791 | // Every PLT entry needs a reloc. | |
792 | gsym->set_needs_dynsym_entry(); | |
793 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
794 | got_offset, 0); | |
795 | ||
796 | // Note that we don't need to save the symbol. The contents of the | |
797 | // PLT are independent of which symbols are used. The symbols only | |
798 | // appear in the relocations. | |
799 | } | |
800 | ||
e291e7b9 ILT |
801 | // Return where the TLSDESC relocations should go, creating it if |
802 | // necessary. These follow the JUMP_SLOT relocations. | |
803 | ||
804 | Output_data_plt_x86_64::Reloc_section* | |
805 | Output_data_plt_x86_64::rela_tlsdesc(Layout* layout) | |
806 | { | |
807 | if (this->tlsdesc_rel_ == NULL) | |
808 | { | |
809 | this->tlsdesc_rel_ = new Reloc_section(false); | |
810 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
811 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 812 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
813 | gold_assert(this->tlsdesc_rel_->output_section() == |
814 | this->rel_->output_section()); | |
815 | } | |
816 | return this->tlsdesc_rel_; | |
817 | } | |
818 | ||
c2b45e22 CC |
819 | // Set the final size. |
820 | void | |
821 | Output_data_plt_x86_64::set_final_data_size() | |
822 | { | |
823 | unsigned int count = this->count_; | |
824 | if (this->has_tlsdesc_entry()) | |
825 | ++count; | |
826 | this->set_data_size((count + 1) * plt_entry_size); | |
827 | } | |
828 | ||
2e30d253 ILT |
829 | // The first entry in the PLT for an executable. |
830 | ||
831 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
832 | { | |
833 | // From AMD64 ABI Draft 0.98, page 76 | |
834 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 835 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
836 | 0xff, 0x25, // jmp indirect |
837 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
838 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
839 | }; | |
840 | ||
841 | // Subsequent entries in the PLT for an executable. | |
842 | ||
843 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
844 | { | |
845 | // From AMD64 ABI Draft 0.98, page 76 | |
846 | 0xff, 0x25, // jmpq indirect | |
847 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
848 | 0x68, // pushq immediate | |
849 | 0, 0, 0, 0, // replaced with offset into relocation table | |
850 | 0xe9, // jmpq relative | |
851 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
852 | }; | |
853 | ||
c2b45e22 CC |
854 | // The reserved TLSDESC entry in the PLT for an executable. |
855 | ||
856 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
857 | { | |
858 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
859 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
860 | 0xff, 0x35, // pushq x(%rip) | |
861 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
862 | 0xff, 0x25, // jmpq *y(%rip) | |
863 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
864 | 0x0f, 0x1f, // nop | |
865 | 0x40, 0 | |
866 | }; | |
867 | ||
2e30d253 ILT |
868 | // Write out the PLT. This uses the hand-coded instructions above, |
869 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
870 | ||
871 | void | |
872 | Output_data_plt_x86_64::do_write(Output_file* of) | |
873 | { | |
2ea97941 | 874 | const off_t offset = this->offset(); |
fe8718a4 ILT |
875 | const section_size_type oview_size = |
876 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 877 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
878 | |
879 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
880 | const section_size_type got_size = |
881 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
882 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
883 | got_size); | |
884 | ||
885 | unsigned char* pov = oview; | |
886 | ||
c2b45e22 | 887 | // The base address of the .plt section. |
a984ee1d | 888 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 889 | // The base address of the .got section. |
a984ee1d | 890 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
891 | // The base address of the PLT portion of the .got section, |
892 | // which is where the GOT pointer will point, and where the | |
893 | // three reserved GOT entries are located. | |
a984ee1d | 894 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
895 | |
896 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 897 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
898 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
899 | (got_address + 8 | |
900 | - (plt_address + 6))); | |
901 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
902 | (got_address + 16 | |
903 | - (plt_address + 12))); | |
2e30d253 ILT |
904 | pov += plt_entry_size; |
905 | ||
906 | unsigned char* got_pov = got_view; | |
907 | ||
908 | memset(got_pov, 0, 24); | |
909 | got_pov += 24; | |
910 | ||
911 | unsigned int plt_offset = plt_entry_size; | |
912 | unsigned int got_offset = 24; | |
913 | const unsigned int count = this->count_; | |
914 | for (unsigned int plt_index = 0; | |
915 | plt_index < count; | |
916 | ++plt_index, | |
917 | pov += plt_entry_size, | |
918 | got_pov += 8, | |
919 | plt_offset += plt_entry_size, | |
920 | got_offset += 8) | |
921 | { | |
922 | // Set and adjust the PLT entry itself. | |
923 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
924 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
925 | (got_address + got_offset | |
926 | - (plt_address + plt_offset | |
927 | + 6))); | |
2e30d253 ILT |
928 | |
929 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
930 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
931 | - (plt_offset + plt_entry_size)); | |
932 | ||
933 | // Set the entry in the GOT. | |
934 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
935 | } | |
936 | ||
c2b45e22 CC |
937 | if (this->has_tlsdesc_entry()) |
938 | { | |
939 | // Set and adjust the reserved TLSDESC PLT entry. | |
940 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
941 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
942 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
943 | (got_address + 8 | |
944 | - (plt_address + plt_offset | |
945 | + 6))); | |
946 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
947 | (got_base | |
948 | + tlsdesc_got_offset | |
949 | - (plt_address + plt_offset | |
950 | + 12))); | |
951 | pov += plt_entry_size; | |
952 | } | |
953 | ||
fe8718a4 ILT |
954 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
955 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 956 | |
2ea97941 | 957 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
958 | of->write_output_view(got_file_offset, got_size, got_view); |
959 | } | |
960 | ||
c2b45e22 | 961 | // Create the PLT section. |
2e30d253 ILT |
962 | |
963 | void | |
c2b45e22 | 964 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 965 | { |
2e30d253 ILT |
966 | if (this->plt_ == NULL) |
967 | { | |
968 | // Create the GOT sections first. | |
969 | this->got_section(symtab, layout); | |
970 | ||
c2b45e22 CC |
971 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
972 | this->got_plt_); | |
2e30d253 ILT |
973 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
974 | (elfcpp::SHF_ALLOC | |
975 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 976 | this->plt_, ORDER_PLT, false); |
2e30d253 | 977 | } |
c2b45e22 CC |
978 | } |
979 | ||
e291e7b9 ILT |
980 | // Return the section for TLSDESC relocations. |
981 | ||
982 | Target_x86_64::Reloc_section* | |
983 | Target_x86_64::rela_tlsdesc_section(Layout* layout) const | |
984 | { | |
985 | return this->plt_section()->rela_tlsdesc(layout); | |
986 | } | |
987 | ||
c2b45e22 CC |
988 | // Create a PLT entry for a global symbol. |
989 | ||
990 | void | |
991 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
992 | Symbol* gsym) | |
993 | { | |
994 | if (gsym->has_plt_offset()) | |
995 | return; | |
996 | ||
997 | if (this->plt_ == NULL) | |
998 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
999 | |
1000 | this->plt_->add_entry(gsym); | |
1001 | } | |
1002 | ||
0e70b911 CC |
1003 | // Return the number of entries in the PLT. |
1004 | ||
1005 | unsigned int | |
1006 | Target_x86_64::plt_entry_count() const | |
1007 | { | |
1008 | if (this->plt_ == NULL) | |
1009 | return 0; | |
1010 | return this->plt_->entry_count(); | |
1011 | } | |
1012 | ||
1013 | // Return the offset of the first non-reserved PLT entry. | |
1014 | ||
1015 | unsigned int | |
1016 | Target_x86_64::first_plt_entry_offset() const | |
1017 | { | |
1018 | return Output_data_plt_x86_64::first_plt_entry_offset(); | |
1019 | } | |
1020 | ||
1021 | // Return the size of each PLT entry. | |
1022 | ||
1023 | unsigned int | |
1024 | Target_x86_64::plt_entry_size() const | |
1025 | { | |
1026 | return Output_data_plt_x86_64::get_plt_entry_size(); | |
1027 | } | |
1028 | ||
9fa33bee | 1029 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1030 | |
1031 | void | |
1032 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1033 | { | |
1034 | if (this->tls_base_symbol_defined_) | |
1035 | return; | |
1036 | ||
1037 | Output_segment* tls_segment = layout->tls_segment(); | |
1038 | if (tls_segment != NULL) | |
1039 | { | |
183fd0e3 | 1040 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1041 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1042 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1043 | tls_segment, 0, 0, |
1044 | elfcpp::STT_TLS, | |
1045 | elfcpp::STB_LOCAL, | |
1046 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1047 | (is_exec |
1048 | ? Symbol::SEGMENT_END | |
1049 | : Symbol::SEGMENT_START), | |
1050 | true); | |
edfbb029 CC |
1051 | } |
1052 | this->tls_base_symbol_defined_ = true; | |
1053 | } | |
1054 | ||
c2b45e22 CC |
1055 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1056 | ||
1057 | void | |
1058 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
1059 | Layout* layout) | |
1060 | { | |
1061 | if (this->plt_ == NULL) | |
1062 | this->make_plt_section(symtab, layout); | |
1063 | ||
1064 | if (!this->plt_->has_tlsdesc_entry()) | |
1065 | { | |
1066 | // Allocate the TLSDESC_GOT entry. | |
1067 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1068 | unsigned int got_offset = got->add_constant(0); | |
1069 | ||
1070 | // Allocate the TLSDESC_PLT entry. | |
1071 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
1072 | } | |
1073 | } | |
1074 | ||
31d60480 ILT |
1075 | // Create a GOT entry for the TLS module index. |
1076 | ||
1077 | unsigned int | |
1078 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
1079 | Sized_relobj<64, false>* object) | |
1080 | { | |
1081 | if (this->got_mod_index_offset_ == -1U) | |
1082 | { | |
1083 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1084 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1085 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1086 | unsigned int got_offset = got->add_constant(0); | |
1087 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1088 | got_offset, 0); | |
009a67a2 | 1089 | got->add_constant(0); |
31d60480 ILT |
1090 | this->got_mod_index_offset_ = got_offset; |
1091 | } | |
1092 | return this->got_mod_index_offset_; | |
1093 | } | |
1094 | ||
2e30d253 ILT |
1095 | // Optimize the TLS relocation type based on what we know about the |
1096 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1097 | // known at link time. | |
1098 | ||
e041f13d | 1099 | tls::Tls_optimization |
2e30d253 ILT |
1100 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
1101 | { | |
2e30d253 ILT |
1102 | // If we are generating a shared library, then we can't do anything |
1103 | // in the linker. | |
8851ecca | 1104 | if (parameters->options().shared()) |
e041f13d | 1105 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1106 | |
1107 | switch (r_type) | |
1108 | { | |
1109 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1110 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1111 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1112 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1113 | // access. Since we know that we are generating an executable, |
1114 | // we can convert this to Initial-Exec. If we also know that | |
1115 | // this is a local symbol, we can further switch to Local-Exec. | |
1116 | if (is_final) | |
e041f13d ILT |
1117 | return tls::TLSOPT_TO_LE; |
1118 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1119 | |
d61c17ea | 1120 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1121 | // This is Local-Dynamic, which refers to a local symbol in the |
1122 | // dynamic TLS block. Since we know that we generating an | |
1123 | // executable, we can switch to Local-Exec. | |
e041f13d | 1124 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1125 | |
0ffd9845 | 1126 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1127 | case elfcpp::R_X86_64_DTPOFF64: |
1128 | // Another Local-Dynamic reloc. | |
e041f13d | 1129 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1130 | |
d61c17ea | 1131 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1132 | // These are Initial-Exec relocs which get the thread offset |
1133 | // from the GOT. If we know that we are linking against the | |
1134 | // local symbol, we can switch to Local-Exec, which links the | |
1135 | // thread offset into the instruction. | |
1136 | if (is_final) | |
e041f13d ILT |
1137 | return tls::TLSOPT_TO_LE; |
1138 | return tls::TLSOPT_NONE; | |
2e30d253 | 1139 | |
d61c17ea | 1140 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1141 | // When we already have Local-Exec, there is nothing further we |
1142 | // can do. | |
e041f13d | 1143 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1144 | |
1145 | default: | |
1146 | gold_unreachable(); | |
1147 | } | |
2e30d253 ILT |
1148 | } |
1149 | ||
e041f13d ILT |
1150 | // Report an unsupported relocation against a local symbol. |
1151 | ||
1152 | void | |
1153 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
1154 | unsigned int r_type) | |
1155 | { | |
75f2446e ILT |
1156 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1157 | object->name().c_str(), r_type); | |
e041f13d ILT |
1158 | } |
1159 | ||
a036edd8 ILT |
1160 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1161 | // dynamic linker does not support it, issue an error. The GNU linker | |
1162 | // only issues a non-PIC error for an allocated read-only section. | |
1163 | // Here we know the section is allocated, but we don't know that it is | |
1164 | // read-only. But we check for all the relocation types which the | |
1165 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
1166 | // error even if the section is not read-only. | |
1167 | ||
1168 | void | |
1169 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
1170 | { | |
1171 | switch (r_type) | |
1172 | { | |
1173 | // These are the relocation types supported by glibc for x86_64. | |
1174 | case elfcpp::R_X86_64_RELATIVE: | |
1175 | case elfcpp::R_X86_64_GLOB_DAT: | |
1176 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1177 | case elfcpp::R_X86_64_DTPMOD64: | |
1178 | case elfcpp::R_X86_64_DTPOFF64: | |
1179 | case elfcpp::R_X86_64_TPOFF64: | |
1180 | case elfcpp::R_X86_64_64: | |
1181 | case elfcpp::R_X86_64_32: | |
1182 | case elfcpp::R_X86_64_PC32: | |
1183 | case elfcpp::R_X86_64_COPY: | |
1184 | return; | |
1185 | ||
1186 | default: | |
1187 | // This prevents us from issuing more than one error per reloc | |
1188 | // section. But we can still wind up issuing more than one | |
1189 | // error per object file. | |
1190 | if (this->issued_non_pic_error_) | |
1191 | return; | |
33aea2fd | 1192 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
1193 | object->error(_("requires unsupported dynamic reloc; " |
1194 | "recompile with -fPIC")); | |
1195 | this->issued_non_pic_error_ = true; | |
1196 | return; | |
1197 | ||
1198 | case elfcpp::R_X86_64_NONE: | |
1199 | gold_unreachable(); | |
1200 | } | |
1201 | } | |
1202 | ||
2e30d253 ILT |
1203 | // Scan a relocation for a local symbol. |
1204 | ||
1205 | inline void | |
ad0f2072 | 1206 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1207 | Layout* layout, |
1208 | Target_x86_64* target, | |
1209 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1210 | unsigned int data_shndx, |
4f4c5f80 | 1211 | Output_section* output_section, |
0ffd9845 | 1212 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1213 | unsigned int r_type, |
7bf1f802 | 1214 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1215 | { |
1216 | switch (r_type) | |
1217 | { | |
1218 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1219 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1220 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1221 | break; |
1222 | ||
1223 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1224 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1225 | // executable), we need to create a dynamic relocation for this |
1226 | // location. The relocation applied at link time will apply the | |
1227 | // link-time value, so we flag the location with an | |
1228 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1229 | // relocate it easily. |
8851ecca | 1230 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1231 | { |
e8c846c3 | 1232 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1233 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1234 | rela_dyn->add_local_relative(object, r_sym, |
1235 | elfcpp::R_X86_64_RELATIVE, | |
1236 | output_section, data_shndx, | |
1237 | reloc.get_r_offset(), | |
1238 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1239 | } |
1240 | break; | |
1241 | ||
2e30d253 ILT |
1242 | case elfcpp::R_X86_64_32: |
1243 | case elfcpp::R_X86_64_32S: | |
1244 | case elfcpp::R_X86_64_16: | |
1245 | case elfcpp::R_X86_64_8: | |
96f2030e | 1246 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1247 | // executable), we need to create a dynamic relocation for this |
1248 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1249 | // because that is always a 64-bit relocation. | |
8851ecca | 1250 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1251 | { |
a036edd8 ILT |
1252 | this->check_non_pic(object, r_type); |
1253 | ||
96f2030e | 1254 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1255 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1256 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1257 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1258 | data_shndx, reloc.get_r_offset(), | |
1259 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1260 | else |
1261 | { | |
1262 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1263 | unsigned int shndx = lsym.get_st_shndx(); |
1264 | bool is_ordinary; | |
1265 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1266 | &is_ordinary); | |
1267 | if (!is_ordinary) | |
1268 | object->error(_("section symbol %u has bad shndx %u"), | |
1269 | r_sym, shndx); | |
1270 | else | |
1271 | rela_dyn->add_local_section(object, shndx, | |
1272 | r_type, output_section, | |
1273 | data_shndx, reloc.get_r_offset(), | |
1274 | reloc.get_r_addend()); | |
dceae3c1 | 1275 | } |
96f2030e | 1276 | } |
2e30d253 ILT |
1277 | break; |
1278 | ||
1279 | case elfcpp::R_X86_64_PC64: | |
1280 | case elfcpp::R_X86_64_PC32: | |
1281 | case elfcpp::R_X86_64_PC16: | |
1282 | case elfcpp::R_X86_64_PC8: | |
1283 | break; | |
1284 | ||
f389a824 ILT |
1285 | case elfcpp::R_X86_64_PLT32: |
1286 | // Since we know this is a local symbol, we can handle this as a | |
1287 | // PC32 reloc. | |
1288 | break; | |
1289 | ||
fdc2f80f | 1290 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1291 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1292 | case elfcpp::R_X86_64_GOTPC64: |
1293 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1294 | // We need a GOT section. |
1295 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1296 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1297 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1298 | break; |
1299 | ||
0ffd9845 ILT |
1300 | case elfcpp::R_X86_64_GOT64: |
1301 | case elfcpp::R_X86_64_GOT32: | |
1302 | case elfcpp::R_X86_64_GOTPCREL64: | |
1303 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1304 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1305 | { |
1306 | // The symbol requires a GOT entry. | |
1307 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1308 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1309 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1310 | { |
1311 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1312 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1313 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1314 | { |
1315 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1316 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1317 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1318 | rela_dyn->add_local_relative( |
1319 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1320 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1321 | else |
dceae3c1 | 1322 | { |
a036edd8 ILT |
1323 | this->check_non_pic(object, r_type); |
1324 | ||
dceae3c1 | 1325 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1326 | rela_dyn->add_local( |
1327 | object, r_sym, r_type, got, | |
1328 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1329 | } |
0ffd9845 ILT |
1330 | } |
1331 | } | |
ee9e9e86 ILT |
1332 | // For GOTPLT64, we'd normally want a PLT section, but since |
1333 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1334 | } |
1335 | break; | |
1336 | ||
2e30d253 ILT |
1337 | case elfcpp::R_X86_64_COPY: |
1338 | case elfcpp::R_X86_64_GLOB_DAT: | |
1339 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1340 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1341 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1342 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1343 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1344 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1345 | gold_error(_("%s: unexpected reloc %u in object file"), |
1346 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1347 | break; |
1348 | ||
d61c17ea | 1349 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1350 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1351 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1352 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1353 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1354 | case elfcpp::R_X86_64_DTPOFF32: |
1355 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1356 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1357 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1358 | { |
8851ecca | 1359 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1360 | const tls::Tls_optimization optimized_type |
1361 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1362 | switch (r_type) |
1363 | { | |
56622147 | 1364 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1365 | if (optimized_type == tls::TLSOPT_NONE) |
1366 | { | |
1367 | // Create a pair of GOT entries for the module index and | |
1368 | // dtv-relative offset. | |
1369 | Output_data_got<64, false>* got | |
1370 | = target->got_section(symtab, layout); | |
1371 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1372 | unsigned int shndx = lsym.get_st_shndx(); |
1373 | bool is_ordinary; | |
1374 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1375 | if (!is_ordinary) | |
1376 | object->error(_("local symbol %u has bad shndx %u"), | |
1377 | r_sym, shndx); | |
1378 | else | |
1379 | got->add_local_pair_with_rela(object, r_sym, | |
1380 | shndx, | |
1381 | GOT_TYPE_TLS_PAIR, | |
1382 | target->rela_dyn_section(layout), | |
1383 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1384 | } |
1385 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1386 | unsupported_reloc_local(object, r_type); | |
1387 | break; | |
1388 | ||
56622147 | 1389 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1390 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1391 | if (optimized_type == tls::TLSOPT_NONE) |
1392 | { | |
1393 | // Create reserved PLT and GOT entries for the resolver. | |
1394 | target->reserve_tlsdesc_entries(symtab, layout); | |
1395 | ||
a8df5856 ILT |
1396 | // Generate a double GOT entry with an |
1397 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
1398 | // is resolved lazily, so the GOT entry needs to be in | |
1399 | // an area in .got.plt, not .got. Call got_section to | |
1400 | // make sure the section has been created. | |
1401 | target->got_section(symtab, layout); | |
1402 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1403 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
e291e7b9 ILT |
1404 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1405 | { | |
1406 | unsigned int got_offset = got->add_constant(0); | |
1407 | got->add_constant(0); | |
1408 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1409 | got_offset); | |
1410 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
1411 | // We store the arguments we need in a vector, and | |
1412 | // use the index into the vector as the parameter | |
1413 | // to pass to the target specific routines. | |
1414 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
1415 | void* arg = reinterpret_cast<void*>(intarg); | |
1416 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1417 | got, got_offset, 0); | |
1418 | } | |
c2b45e22 CC |
1419 | } |
1420 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1421 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1422 | break; |
1423 | ||
c2b45e22 CC |
1424 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1425 | break; | |
1426 | ||
e041f13d | 1427 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1428 | if (optimized_type == tls::TLSOPT_NONE) |
1429 | { | |
1430 | // Create a GOT entry for the module index. | |
31d60480 | 1431 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1432 | } |
1433 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1434 | unsupported_reloc_local(object, r_type); | |
1435 | break; | |
1436 | ||
0ffd9845 ILT |
1437 | case elfcpp::R_X86_64_DTPOFF32: |
1438 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1439 | break; |
1440 | ||
56622147 | 1441 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1442 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1443 | if (optimized_type == tls::TLSOPT_NONE) |
1444 | { | |
1445 | // Create a GOT entry for the tp-relative offset. | |
1446 | Output_data_got<64, false>* got | |
1447 | = target->got_section(symtab, layout); | |
1448 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1449 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1450 | target->rela_dyn_section(layout), |
1451 | elfcpp::R_X86_64_TPOFF64); | |
1452 | } | |
1453 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1454 | unsupported_reloc_local(object, r_type); |
1455 | break; | |
0ffd9845 | 1456 | |
56622147 | 1457 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1458 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1459 | if (output_is_shared) |
1460 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1461 | break; |
e041f13d ILT |
1462 | |
1463 | default: | |
1464 | gold_unreachable(); | |
2e30d253 ILT |
1465 | } |
1466 | } | |
1467 | break; | |
2e30d253 | 1468 | |
fdc2f80f ILT |
1469 | case elfcpp::R_X86_64_SIZE32: |
1470 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1471 | default: |
75f2446e ILT |
1472 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1473 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1474 | break; |
1475 | } | |
1476 | } | |
1477 | ||
1478 | ||
e041f13d ILT |
1479 | // Report an unsupported relocation against a global symbol. |
1480 | ||
1481 | void | |
1482 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1483 | unsigned int r_type, | |
1484 | Symbol* gsym) | |
1485 | { | |
75f2446e | 1486 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1487 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1488 | } |
1489 | ||
ce97fa81 | 1490 | // Returns true if this relocation type could be that of a function pointer. |
21bb3914 ST |
1491 | inline bool |
1492 | Target_x86_64::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1493 | { | |
21bb3914 ST |
1494 | switch (r_type) |
1495 | { | |
1496 | case elfcpp::R_X86_64_64: | |
1497 | case elfcpp::R_X86_64_32: | |
1498 | case elfcpp::R_X86_64_32S: | |
1499 | case elfcpp::R_X86_64_16: | |
1500 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
1501 | case elfcpp::R_X86_64_GOT64: |
1502 | case elfcpp::R_X86_64_GOT32: | |
1503 | case elfcpp::R_X86_64_GOTPCREL64: | |
1504 | case elfcpp::R_X86_64_GOTPCREL: | |
1505 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
1506 | { |
1507 | return true; | |
1508 | } | |
1509 | } | |
1510 | return false; | |
1511 | } | |
1512 | ||
1513 | // For safe ICF, scan a relocation for a local symbol to check if it | |
1514 | // corresponds to a function pointer being taken. In that case mark | |
1515 | // the function whose pointer was taken as not foldable. | |
1516 | ||
1517 | inline bool | |
1518 | Target_x86_64::Scan::local_reloc_may_be_function_pointer( | |
1519 | Symbol_table* , | |
1520 | Layout* , | |
1521 | Target_x86_64* , | |
1522 | Sized_relobj<64, false>* , | |
1523 | unsigned int , | |
1524 | Output_section* , | |
1525 | const elfcpp::Rela<64, false>& , | |
1526 | unsigned int r_type, | |
1527 | const elfcpp::Sym<64, false>&) | |
1528 | { | |
1529 | // When building a shared library, do not fold any local symbols as it is | |
1530 | // not possible to distinguish pointer taken versus a call by looking at | |
1531 | // the relocation types. | |
1532 | return (parameters->options().shared() | |
1533 | || possible_function_pointer_reloc(r_type)); | |
1534 | } | |
1535 | ||
1536 | // For safe ICF, scan a relocation for a global symbol to check if it | |
1537 | // corresponds to a function pointer being taken. In that case mark | |
1538 | // the function whose pointer was taken as not foldable. | |
1539 | ||
1540 | inline bool | |
1541 | Target_x86_64::Scan::global_reloc_may_be_function_pointer( | |
1542 | Symbol_table*, | |
1543 | Layout* , | |
1544 | Target_x86_64* , | |
1545 | Sized_relobj<64, false>* , | |
1546 | unsigned int , | |
1547 | Output_section* , | |
1548 | const elfcpp::Rela<64, false>& , | |
1549 | unsigned int r_type, | |
1550 | Symbol* gsym) | |
1551 | { | |
1552 | // When building a shared library, do not fold symbols whose visibility | |
1553 | // is hidden, internal or protected. | |
1554 | return ((parameters->options().shared() | |
1555 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
1556 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
1557 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
1558 | || possible_function_pointer_reloc(r_type)); | |
1559 | } | |
1560 | ||
2e30d253 ILT |
1561 | // Scan a relocation for a global symbol. |
1562 | ||
1563 | inline void | |
ad0f2072 | 1564 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1565 | Layout* layout, |
1566 | Target_x86_64* target, | |
1567 | Sized_relobj<64, false>* object, | |
1568 | unsigned int data_shndx, | |
4f4c5f80 | 1569 | Output_section* output_section, |
d61c17ea ILT |
1570 | const elfcpp::Rela<64, false>& reloc, |
1571 | unsigned int r_type, | |
1572 | Symbol* gsym) | |
2e30d253 ILT |
1573 | { |
1574 | switch (r_type) | |
1575 | { | |
1576 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1577 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1578 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1579 | break; |
1580 | ||
1581 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1582 | case elfcpp::R_X86_64_32: |
1583 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1584 | case elfcpp::R_X86_64_16: |
2e30d253 | 1585 | case elfcpp::R_X86_64_8: |
96f2030e | 1586 | { |
d61c6bd4 ILT |
1587 | // Make a PLT entry if necessary. |
1588 | if (gsym->needs_plt_entry()) | |
1589 | { | |
1590 | target->make_plt_entry(symtab, layout, gsym); | |
1591 | // Since this is not a PC-relative relocation, we may be | |
1592 | // taking the address of a function. In that case we need to | |
1593 | // set the entry in the dynamic symbol table to the address of | |
1594 | // the PLT entry. | |
8851ecca | 1595 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1596 | gsym->set_needs_dynsym_value(); |
1597 | } | |
1598 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1599 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1600 | { |
966d4097 | 1601 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1602 | { |
12c0daef | 1603 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1604 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1605 | } |
1606 | else if (r_type == elfcpp::R_X86_64_64 | |
1607 | && gsym->can_use_relative_reloc(false)) | |
1608 | { | |
1609 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1610 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1611 | output_section, object, | |
1612 | data_shndx, reloc.get_r_offset(), | |
1613 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1614 | } |
1615 | else | |
1616 | { | |
a036edd8 | 1617 | this->check_non_pic(object, r_type); |
96f2030e | 1618 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1619 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1620 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1621 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1622 | } |
1623 | } | |
1624 | } | |
1625 | break; | |
1626 | ||
1627 | case elfcpp::R_X86_64_PC64: | |
1628 | case elfcpp::R_X86_64_PC32: | |
1629 | case elfcpp::R_X86_64_PC16: | |
1630 | case elfcpp::R_X86_64_PC8: | |
1631 | { | |
1632 | // Make a PLT entry if necessary. | |
1633 | if (gsym->needs_plt_entry()) | |
1634 | target->make_plt_entry(symtab, layout, gsym); | |
1635 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1636 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1637 | if (gsym->is_func()) |
0700cf32 ILT |
1638 | flags |= Symbol::FUNCTION_CALL; |
1639 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1640 | { |
966d4097 | 1641 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1642 | { |
12c0daef | 1643 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1644 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1645 | } |
86849f1f | 1646 | else |
d61c6bd4 | 1647 | { |
a036edd8 | 1648 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1649 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1650 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1651 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1652 | reloc.get_r_addend()); |
1653 | } | |
86849f1f | 1654 | } |
d61c6bd4 | 1655 | } |
2e30d253 ILT |
1656 | break; |
1657 | ||
ff006520 | 1658 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1659 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1660 | case elfcpp::R_X86_64_GOTPCREL64: |
1661 | case elfcpp::R_X86_64_GOTPCREL: | |
1662 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1663 | { |
1664 | // The symbol requires a GOT entry. | |
1665 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1666 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1667 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1668 | else |
1669 | { | |
2e30d253 ILT |
1670 | // If this symbol is not fully resolved, we need to add a |
1671 | // dynamic relocation for it. | |
7bf1f802 | 1672 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1673 | if (gsym->is_from_dynobj() |
1674 | || gsym->is_undefined() | |
1675 | || gsym->is_preemptible()) | |
0a65a3a7 | 1676 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1677 | elfcpp::R_X86_64_GLOB_DAT); |
1678 | else | |
2e30d253 | 1679 | { |
0a65a3a7 CC |
1680 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1681 | rela_dyn->add_global_relative( | |
1682 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1683 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1684 | } |
1685 | } | |
ee9e9e86 ILT |
1686 | // For GOTPLT64, we also need a PLT entry (but only if the |
1687 | // symbol is not fully resolved). | |
1688 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1689 | && !gsym->final_value_is_known()) | |
1690 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1691 | } |
1692 | break; | |
1693 | ||
1694 | case elfcpp::R_X86_64_PLT32: | |
1695 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1696 | // Otherwise we need a PLT entry. | |
1697 | if (gsym->final_value_is_known()) | |
1698 | break; | |
96f2030e ILT |
1699 | // If building a shared library, we can also skip the PLT entry |
1700 | // if the symbol is defined in the output file and is protected | |
1701 | // or hidden. | |
1702 | if (gsym->is_defined() | |
1703 | && !gsym->is_from_dynobj() | |
1704 | && !gsym->is_preemptible()) | |
1705 | break; | |
2e30d253 ILT |
1706 | target->make_plt_entry(symtab, layout, gsym); |
1707 | break; | |
1708 | ||
fdc2f80f | 1709 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1710 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1711 | case elfcpp::R_X86_64_GOTPC64: |
1712 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1713 | // We need a GOT section. |
1714 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1715 | // For PLTOFF64, we also need a PLT entry (but only if the |
1716 | // symbol is not fully resolved). | |
1717 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1718 | && !gsym->final_value_is_known()) | |
1719 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1720 | break; |
1721 | ||
2e30d253 ILT |
1722 | case elfcpp::R_X86_64_COPY: |
1723 | case elfcpp::R_X86_64_GLOB_DAT: | |
1724 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1725 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1726 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1727 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1728 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1729 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1730 | gold_error(_("%s: unexpected reloc %u in object file"), |
1731 | object->name().c_str(), r_type); | |
2e30d253 | 1732 | break; |
2e30d253 | 1733 | |
d61c17ea | 1734 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1735 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1736 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1737 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1738 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1739 | case elfcpp::R_X86_64_DTPOFF32: |
1740 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1741 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1742 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1743 | { |
1744 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1745 | const tls::Tls_optimization optimized_type |
1746 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1747 | switch (r_type) |
1748 | { | |
56622147 | 1749 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1750 | if (optimized_type == tls::TLSOPT_NONE) |
1751 | { | |
1752 | // Create a pair of GOT entries for the module index and | |
1753 | // dtv-relative offset. | |
1754 | Output_data_got<64, false>* got | |
1755 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1756 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1757 | target->rela_dyn_section(layout), | |
1758 | elfcpp::R_X86_64_DTPMOD64, | |
1759 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1760 | } |
1761 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1762 | { | |
1763 | // Create a GOT entry for the tp-relative offset. | |
1764 | Output_data_got<64, false>* got | |
1765 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1766 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1767 | target->rela_dyn_section(layout), |
1768 | elfcpp::R_X86_64_TPOFF64); | |
1769 | } | |
1770 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1771 | unsupported_reloc_global(object, r_type, gsym); | |
1772 | break; | |
1773 | ||
56622147 | 1774 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1775 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1776 | if (optimized_type == tls::TLSOPT_NONE) |
1777 | { | |
1778 | // Create reserved PLT and GOT entries for the resolver. | |
1779 | target->reserve_tlsdesc_entries(symtab, layout); | |
1780 | ||
a8df5856 ILT |
1781 | // Create a double GOT entry with an R_X86_64_TLSDESC |
1782 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
1783 | // lazily, so the GOT entry needs to be in an area in | |
1784 | // .got.plt, not .got. Call got_section to make sure | |
1785 | // the section has been created. | |
1786 | target->got_section(symtab, layout); | |
1787 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
e291e7b9 ILT |
1788 | Reloc_section *rt = target->rela_tlsdesc_section(layout); |
1789 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1790 | elfcpp::R_X86_64_TLSDESC, 0); |
1791 | } | |
1792 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1793 | { | |
1794 | // Create a GOT entry for the tp-relative offset. | |
1795 | Output_data_got<64, false>* got | |
1796 | = target->got_section(symtab, layout); | |
1797 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1798 | target->rela_dyn_section(layout), | |
1799 | elfcpp::R_X86_64_TPOFF64); | |
1800 | } | |
1801 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1802 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1803 | break; |
1804 | ||
c2b45e22 CC |
1805 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1806 | break; | |
1807 | ||
e041f13d | 1808 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1809 | if (optimized_type == tls::TLSOPT_NONE) |
1810 | { | |
1811 | // Create a GOT entry for the module index. | |
31d60480 | 1812 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1813 | } |
1814 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1815 | unsupported_reloc_global(object, r_type, gsym); | |
1816 | break; | |
1817 | ||
0ffd9845 ILT |
1818 | case elfcpp::R_X86_64_DTPOFF32: |
1819 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1820 | break; |
1821 | ||
56622147 | 1822 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1823 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1824 | if (optimized_type == tls::TLSOPT_NONE) |
1825 | { | |
1826 | // Create a GOT entry for the tp-relative offset. | |
1827 | Output_data_got<64, false>* got | |
1828 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1829 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1830 | target->rela_dyn_section(layout), |
1831 | elfcpp::R_X86_64_TPOFF64); | |
1832 | } | |
1833 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1834 | unsupported_reloc_global(object, r_type, gsym); |
1835 | break; | |
0ffd9845 | 1836 | |
56622147 | 1837 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1838 | layout->set_has_static_tls(); |
8851ecca | 1839 | if (parameters->options().shared()) |
7bf1f802 | 1840 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1841 | break; |
e041f13d ILT |
1842 | |
1843 | default: | |
1844 | gold_unreachable(); | |
2e30d253 ILT |
1845 | } |
1846 | } | |
1847 | break; | |
fdc2f80f ILT |
1848 | |
1849 | case elfcpp::R_X86_64_SIZE32: | |
1850 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1851 | default: |
75f2446e | 1852 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1853 | object->name().c_str(), r_type, |
1854 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1855 | break; |
1856 | } | |
1857 | } | |
1858 | ||
6d03d481 | 1859 | void |
ad0f2072 | 1860 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1861 | Layout* layout, |
1862 | Sized_relobj<64, false>* object, | |
1863 | unsigned int data_shndx, | |
1864 | unsigned int sh_type, | |
1865 | const unsigned char* prelocs, | |
1866 | size_t reloc_count, | |
1867 | Output_section* output_section, | |
1868 | bool needs_special_offset_handling, | |
1869 | size_t local_symbol_count, | |
1870 | const unsigned char* plocal_symbols) | |
1871 | { | |
1872 | ||
1873 | if (sh_type == elfcpp::SHT_REL) | |
1874 | { | |
1875 | return; | |
1876 | } | |
1877 | ||
1878 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
41cbeecc ST |
1879 | Target_x86_64::Scan, |
1880 | Target_x86_64::Relocatable_size_for_reloc>( | |
6d03d481 ST |
1881 | symtab, |
1882 | layout, | |
1883 | this, | |
1884 | object, | |
1885 | data_shndx, | |
1886 | prelocs, | |
1887 | reloc_count, | |
1888 | output_section, | |
1889 | needs_special_offset_handling, | |
1890 | local_symbol_count, | |
1891 | plocal_symbols); | |
1892 | ||
1893 | } | |
2e30d253 ILT |
1894 | // Scan relocations for a section. |
1895 | ||
1896 | void | |
ad0f2072 | 1897 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
1898 | Layout* layout, |
1899 | Sized_relobj<64, false>* object, | |
1900 | unsigned int data_shndx, | |
1901 | unsigned int sh_type, | |
1902 | const unsigned char* prelocs, | |
1903 | size_t reloc_count, | |
730cdc88 ILT |
1904 | Output_section* output_section, |
1905 | bool needs_special_offset_handling, | |
d61c17ea | 1906 | size_t local_symbol_count, |
730cdc88 | 1907 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1908 | { |
1909 | if (sh_type == elfcpp::SHT_REL) | |
1910 | { | |
75f2446e ILT |
1911 | gold_error(_("%s: unsupported REL reloc section"), |
1912 | object->name().c_str()); | |
1913 | return; | |
2e30d253 ILT |
1914 | } |
1915 | ||
1916 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1917 | Target_x86_64::Scan>( | |
2e30d253 ILT |
1918 | symtab, |
1919 | layout, | |
1920 | this, | |
1921 | object, | |
1922 | data_shndx, | |
1923 | prelocs, | |
1924 | reloc_count, | |
730cdc88 ILT |
1925 | output_section, |
1926 | needs_special_offset_handling, | |
2e30d253 | 1927 | local_symbol_count, |
730cdc88 | 1928 | plocal_symbols); |
2e30d253 ILT |
1929 | } |
1930 | ||
1931 | // Finalize the sections. | |
1932 | ||
1933 | void | |
f59f41f3 DK |
1934 | Target_x86_64::do_finalize_sections( |
1935 | Layout* layout, | |
1936 | const Input_objects*, | |
e785ec03 | 1937 | Symbol_table* symtab) |
2e30d253 | 1938 | { |
ea715a34 ILT |
1939 | const Reloc_section* rel_plt = (this->plt_ == NULL |
1940 | ? NULL | |
e291e7b9 | 1941 | : this->plt_->rela_plt()); |
ea715a34 | 1942 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 1943 | this->rela_dyn_, true, false); |
ea715a34 | 1944 | |
2e30d253 ILT |
1945 | // Fill in some more dynamic tags. |
1946 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1947 | if (odyn != NULL) | |
1948 | { | |
22b127cc | 1949 | if (this->plt_ != NULL |
ea715a34 ILT |
1950 | && this->plt_->output_section() != NULL |
1951 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 1952 | { |
ea715a34 ILT |
1953 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
1954 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1955 | this->got_->finalize_data_size(); | |
1956 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1957 | this->plt_, plt_offset); | |
1958 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1959 | this->got_, got_offset); | |
2e30d253 ILT |
1960 | } |
1961 | } | |
1962 | ||
1963 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1964 | // relocs. | |
12c0daef ILT |
1965 | if (this->copy_relocs_.any_saved_relocs()) |
1966 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
1967 | |
1968 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
1969 | // the .got.plt section. | |
1970 | Symbol* sym = this->global_offset_table_; | |
1971 | if (sym != NULL) | |
1972 | { | |
1973 | uint64_t data_size = this->got_plt_->current_data_size(); | |
1974 | symtab->get_sized_symbol<64>(sym)->set_symsize(data_size); | |
1975 | } | |
2e30d253 ILT |
1976 | } |
1977 | ||
1978 | // Perform a relocation. | |
1979 | ||
1980 | inline bool | |
1981 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1982 | Target_x86_64* target, | |
031cdbed | 1983 | Output_section*, |
2e30d253 | 1984 | size_t relnum, |
0ffd9845 | 1985 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1986 | unsigned int r_type, |
1987 | const Sized_symbol<64>* gsym, | |
1988 | const Symbol_value<64>* psymval, | |
1989 | unsigned char* view, | |
1990 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1991 | section_size_type view_size) |
2e30d253 ILT |
1992 | { |
1993 | if (this->skip_call_tls_get_addr_) | |
1994 | { | |
5efc7cd2 CC |
1995 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1996 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1997 | || gsym == NULL |
0ffd9845 | 1998 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1999 | { |
75f2446e ILT |
2000 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2001 | _("missing expected TLS relocation")); | |
2002 | } | |
2003 | else | |
2004 | { | |
2005 | this->skip_call_tls_get_addr_ = false; | |
2006 | return false; | |
2e30d253 | 2007 | } |
2e30d253 ILT |
2008 | } |
2009 | ||
2010 | // Pick the value to use for symbols defined in shared objects. | |
2011 | Symbol_value<64> symval; | |
96f2030e | 2012 | if (gsym != NULL |
de4c45bd ILT |
2013 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
2014 | || r_type == elfcpp::R_X86_64_PC32 | |
2015 | || r_type == elfcpp::R_X86_64_PC16 | |
2016 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
2017 | { |
2018 | symval.set_output_value(target->plt_section()->address() | |
2019 | + gsym->plt_offset()); | |
2020 | psymval = &symval; | |
2021 | } | |
2022 | ||
2023 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
2024 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2025 | ||
2026 | // Get the GOT offset if needed. | |
96f2030e ILT |
2027 | // The GOT pointer points to the end of the GOT section. |
2028 | // We need to subtract the size of the GOT section to get | |
2029 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
2030 | bool have_got_offset = false; |
2031 | unsigned int got_offset = 0; | |
2032 | switch (r_type) | |
2033 | { | |
2034 | case elfcpp::R_X86_64_GOT32: | |
2035 | case elfcpp::R_X86_64_GOT64: | |
2036 | case elfcpp::R_X86_64_GOTPLT64: | |
2037 | case elfcpp::R_X86_64_GOTPCREL: | |
2038 | case elfcpp::R_X86_64_GOTPCREL64: | |
2039 | if (gsym != NULL) | |
2040 | { | |
0a65a3a7 CC |
2041 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2042 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
2043 | } |
2044 | else | |
2045 | { | |
2046 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2047 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2048 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2049 | - target->got_size()); | |
0ffd9845 ILT |
2050 | } |
2051 | have_got_offset = true; | |
2052 | break; | |
2053 | ||
2054 | default: | |
2055 | break; | |
2056 | } | |
2e30d253 ILT |
2057 | |
2058 | switch (r_type) | |
2059 | { | |
2060 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2061 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2062 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2063 | break; |
2064 | ||
2065 | case elfcpp::R_X86_64_64: | |
2066 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
2067 | break; | |
2068 | ||
2069 | case elfcpp::R_X86_64_PC64: | |
2070 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
2071 | address); | |
2072 | break; | |
2073 | ||
2074 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
2075 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2076 | // uint64_t x = value + addend; | |
2077 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
2078 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
2079 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2080 | break; | |
2081 | ||
2082 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
2083 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2084 | // int64_t x = value + addend; // note this quantity is signed! | |
2085 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
2086 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2087 | break; | |
2088 | ||
2089 | case elfcpp::R_X86_64_PC32: | |
2090 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
2091 | address); | |
2092 | break; | |
2093 | ||
2094 | case elfcpp::R_X86_64_16: | |
2095 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
2096 | break; | |
2097 | ||
2098 | case elfcpp::R_X86_64_PC16: | |
2099 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
2100 | address); | |
2101 | break; | |
2102 | ||
2103 | case elfcpp::R_X86_64_8: | |
2104 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
2105 | break; | |
2106 | ||
2107 | case elfcpp::R_X86_64_PC8: | |
2108 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
2109 | address); | |
2110 | break; | |
2111 | ||
2112 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
2113 | gold_assert(gsym == NULL |
2114 | || gsym->has_plt_offset() | |
99f8faca ILT |
2115 | || gsym->final_value_is_known() |
2116 | || (gsym->is_defined() | |
2117 | && !gsym->is_from_dynobj() | |
2118 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
2119 | // Note: while this code looks the same as for R_X86_64_PC32, it |
2120 | // behaves differently because psymval was set to point to | |
2121 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
2122 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
2123 | address); | |
2124 | break; | |
2125 | ||
ee9e9e86 ILT |
2126 | case elfcpp::R_X86_64_PLTOFF64: |
2127 | { | |
2128 | gold_assert(gsym); | |
2129 | gold_assert(gsym->has_plt_offset() | |
2130 | || gsym->final_value_is_known()); | |
2131 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
2132 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
2133 | Relocate_functions<64, false>::rela64(view, object, psymval, |
2134 | addend - got_address); | |
ee9e9e86 ILT |
2135 | } |
2136 | ||
2e30d253 | 2137 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
2138 | gold_assert(have_got_offset); |
2139 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
2140 | break; |
2141 | ||
e822f2b1 ILT |
2142 | case elfcpp::R_X86_64_GOTPC32: |
2143 | { | |
2144 | gold_assert(gsym); | |
2145 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2146 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2147 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2148 | } | |
2149 | break; | |
2150 | ||
2151 | case elfcpp::R_X86_64_GOT64: | |
2152 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
2153 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 2154 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2155 | gold_assert(have_got_offset); |
2156 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
2157 | break; |
2158 | ||
2159 | case elfcpp::R_X86_64_GOTPC64: | |
2160 | { | |
2161 | gold_assert(gsym); | |
2162 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2163 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2164 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
2165 | } | |
2166 | break; | |
2167 | ||
2e30d253 ILT |
2168 | case elfcpp::R_X86_64_GOTOFF64: |
2169 | { | |
2170 | elfcpp::Elf_types<64>::Elf_Addr value; | |
2171 | value = (psymval->value(object, 0) | |
96f2030e | 2172 | - target->got_plt_section()->address()); |
2e30d253 ILT |
2173 | Relocate_functions<64, false>::rela64(view, value, addend); |
2174 | } | |
2175 | break; | |
2176 | ||
2177 | case elfcpp::R_X86_64_GOTPCREL: | |
2178 | { | |
0ffd9845 ILT |
2179 | gold_assert(have_got_offset); |
2180 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2181 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2182 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
2183 | } |
2184 | break; | |
2185 | ||
e822f2b1 ILT |
2186 | case elfcpp::R_X86_64_GOTPCREL64: |
2187 | { | |
0ffd9845 ILT |
2188 | gold_assert(have_got_offset); |
2189 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2190 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2191 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
2192 | } |
2193 | break; | |
2194 | ||
2e30d253 ILT |
2195 | case elfcpp::R_X86_64_COPY: |
2196 | case elfcpp::R_X86_64_GLOB_DAT: | |
2197 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2198 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 2199 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2200 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2201 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2202 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2203 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2204 | _("unexpected reloc %u in object file"), | |
2205 | r_type); | |
2e30d253 ILT |
2206 | break; |
2207 | ||
d61c17ea | 2208 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2209 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2210 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2211 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2212 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2213 | case elfcpp::R_X86_64_DTPOFF32: |
2214 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2215 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2216 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
2217 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2218 | view, address, view_size); | |
2e30d253 | 2219 | break; |
2e30d253 | 2220 | |
fdc2f80f ILT |
2221 | case elfcpp::R_X86_64_SIZE32: |
2222 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2223 | default: |
75f2446e ILT |
2224 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2225 | _("unsupported reloc %u"), | |
2226 | r_type); | |
2e30d253 ILT |
2227 | break; |
2228 | } | |
2229 | ||
2230 | return true; | |
2231 | } | |
2232 | ||
2233 | // Perform a TLS relocation. | |
2234 | ||
2235 | inline void | |
d61c17ea | 2236 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 2237 | Target_x86_64* target, |
d61c17ea | 2238 | size_t relnum, |
72ec2876 | 2239 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2240 | unsigned int r_type, |
2241 | const Sized_symbol<64>* gsym, | |
2242 | const Symbol_value<64>* psymval, | |
2243 | unsigned char* view, | |
6a41d30b | 2244 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2245 | section_size_type view_size) |
2e30d253 | 2246 | { |
2e30d253 | 2247 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
2248 | |
2249 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 2250 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
2251 | |
2252 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
2253 | ||
2254 | const bool is_final = (gsym == NULL | |
b3705d2a | 2255 | ? !parameters->options().shared() |
2e30d253 | 2256 | : gsym->final_value_is_known()); |
e041f13d ILT |
2257 | const tls::Tls_optimization optimized_type |
2258 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
2259 | switch (r_type) |
2260 | { | |
56622147 | 2261 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 2262 | this->saw_tls_block_reloc_ = true; |
e041f13d | 2263 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 2264 | { |
7bf1f802 | 2265 | gold_assert(tls_segment != NULL); |
2e30d253 | 2266 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 2267 | rela, r_type, value, view, |
2e30d253 ILT |
2268 | view_size); |
2269 | break; | |
2270 | } | |
7bf1f802 ILT |
2271 | else |
2272 | { | |
c2b45e22 CC |
2273 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2274 | ? GOT_TYPE_TLS_OFFSET | |
2275 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2276 | unsigned int got_offset; |
2277 | if (gsym != NULL) | |
2278 | { | |
c2b45e22 CC |
2279 | gold_assert(gsym->has_got_offset(got_type)); |
2280 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2281 | } |
2282 | else | |
2283 | { | |
2284 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2285 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2286 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2287 | - target->got_size()); |
2288 | } | |
2289 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2290 | { | |
2291 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2292 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2293 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2294 | value, view, address, view_size); |
7bf1f802 ILT |
2295 | break; |
2296 | } | |
2297 | else if (optimized_type == tls::TLSOPT_NONE) | |
2298 | { | |
2299 | // Relocate the field with the offset of the pair of GOT | |
2300 | // entries. | |
6a41d30b ILT |
2301 | value = target->got_plt_section()->address() + got_offset; |
2302 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2303 | address); | |
7bf1f802 ILT |
2304 | break; |
2305 | } | |
2306 | } | |
72ec2876 | 2307 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2308 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2309 | break; |
2310 | ||
c2b45e22 CC |
2311 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2312 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2313 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2314 | if (optimized_type == tls::TLSOPT_TO_LE) |
2315 | { | |
2316 | gold_assert(tls_segment != NULL); | |
2317 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2318 | rela, r_type, value, view, | |
2319 | view_size); | |
2320 | break; | |
2321 | } | |
2322 | else | |
2323 | { | |
2324 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2325 | ? GOT_TYPE_TLS_OFFSET | |
2326 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2327 | unsigned int got_offset = 0; |
2328 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC | |
2329 | && optimized_type == tls::TLSOPT_NONE) | |
2330 | { | |
2331 | // We created GOT entries in the .got.tlsdesc portion of | |
2332 | // the .got.plt section, but the offset stored in the | |
2333 | // symbol is the offset within .got.tlsdesc. | |
2334 | got_offset = (target->got_size() | |
2335 | + target->got_plt_section()->data_size()); | |
2336 | } | |
c2b45e22 CC |
2337 | if (gsym != NULL) |
2338 | { | |
2339 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2340 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2341 | } |
2342 | else | |
2343 | { | |
2344 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2345 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2346 | got_offset += (object->local_got_offset(r_sym, got_type) |
2347 | - target->got_size()); | |
c2b45e22 CC |
2348 | } |
2349 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2350 | { | |
2351 | gold_assert(tls_segment != NULL); | |
2352 | value = target->got_plt_section()->address() + got_offset; | |
2353 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2354 | rela, r_type, value, view, address, | |
2355 | view_size); | |
2356 | break; | |
2357 | } | |
2358 | else if (optimized_type == tls::TLSOPT_NONE) | |
2359 | { | |
2360 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2361 | { | |
2362 | // Relocate the field with the offset of the pair of GOT | |
2363 | // entries. | |
2364 | value = target->got_plt_section()->address() + got_offset; | |
2365 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2366 | address); | |
2367 | } | |
2368 | break; | |
2369 | } | |
2370 | } | |
2371 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2372 | _("unsupported reloc %u"), r_type); | |
2373 | break; | |
2374 | ||
56622147 | 2375 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2376 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2377 | if (optimized_type == tls::TLSOPT_TO_LE) |
2378 | { | |
7bf1f802 | 2379 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2380 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2381 | value, view, view_size); | |
2382 | break; | |
e041f13d | 2383 | } |
7bf1f802 ILT |
2384 | else if (optimized_type == tls::TLSOPT_NONE) |
2385 | { | |
2386 | // Relocate the field with the offset of the GOT entry for | |
2387 | // the module index. | |
2388 | unsigned int got_offset; | |
31d60480 ILT |
2389 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2390 | - target->got_size()); | |
6a41d30b ILT |
2391 | value = target->got_plt_section()->address() + got_offset; |
2392 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2393 | address); | |
7bf1f802 ILT |
2394 | break; |
2395 | } | |
72ec2876 | 2396 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2397 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2398 | break; |
0ffd9845 ILT |
2399 | |
2400 | case elfcpp::R_X86_64_DTPOFF32: | |
e041f13d | 2401 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2402 | { |
2403 | // This relocation type is used in debugging information. | |
2404 | // In that case we need to not optimize the value. If we | |
2405 | // haven't seen a TLSLD reloc, then we assume we should not | |
2406 | // optimize this reloc. | |
2407 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2408 | { |
2409 | gold_assert(tls_segment != NULL); | |
2410 | value -= tls_segment->memsz(); | |
2411 | } | |
497897f9 | 2412 | } |
d85c80a3 | 2413 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2414 | break; |
2415 | ||
2416 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d | 2417 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2418 | { |
2419 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2420 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2421 | { |
2422 | gold_assert(tls_segment != NULL); | |
2423 | value -= tls_segment->memsz(); | |
2424 | } | |
497897f9 | 2425 | } |
d85c80a3 | 2426 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2427 | break; |
2e30d253 | 2428 | |
56622147 ILT |
2429 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2430 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2431 | { | |
7bf1f802 | 2432 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2433 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2434 | rela, r_type, value, view, | |
2435 | view_size); | |
2436 | break; | |
2437 | } | |
7bf1f802 ILT |
2438 | else if (optimized_type == tls::TLSOPT_NONE) |
2439 | { | |
2440 | // Relocate the field with the offset of the GOT entry for | |
2441 | // the tp-relative offset of the symbol. | |
2442 | unsigned int got_offset; | |
2443 | if (gsym != NULL) | |
2444 | { | |
0a65a3a7 CC |
2445 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2446 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2447 | - target->got_size()); | |
7bf1f802 ILT |
2448 | } |
2449 | else | |
2450 | { | |
2451 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2452 | gold_assert(object->local_has_got_offset(r_sym, |
2453 | GOT_TYPE_TLS_OFFSET)); | |
2454 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2455 | - target->got_size()); |
2456 | } | |
6a41d30b ILT |
2457 | value = target->got_plt_section()->address() + got_offset; |
2458 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2459 | break; |
2460 | } | |
56622147 ILT |
2461 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2462 | _("unsupported reloc type %u"), | |
2463 | r_type); | |
2464 | break; | |
0ffd9845 | 2465 | |
56622147 | 2466 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2467 | value -= tls_segment->memsz(); |
d85c80a3 | 2468 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2469 | break; |
2e30d253 | 2470 | } |
2e30d253 ILT |
2471 | } |
2472 | ||
7bf1f802 ILT |
2473 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2474 | // Initial-Exec. | |
2475 | ||
2476 | inline void | |
2477 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2478 | size_t relnum, | |
c2b45e22 | 2479 | Output_segment*, |
7bf1f802 ILT |
2480 | const elfcpp::Rela<64, false>& rela, |
2481 | unsigned int, | |
2482 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2483 | unsigned char* view, | |
c2b45e22 | 2484 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2485 | section_size_type view_size) |
7bf1f802 ILT |
2486 | { |
2487 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2488 | // .word 0x6666; rex64; call __tls_get_addr | |
2489 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2490 | ||
2491 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2492 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2493 | ||
2494 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2495 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2496 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2497 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2498 | ||
2499 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2500 | ||
c2b45e22 CC |
2501 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2502 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2503 | |
2504 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2505 | // We can skip it. | |
2506 | this->skip_call_tls_get_addr_ = true; | |
2507 | } | |
2508 | ||
e041f13d | 2509 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2510 | // Local-Exec. |
2511 | ||
2512 | inline void | |
d61c17ea ILT |
2513 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2514 | size_t relnum, | |
2515 | Output_segment* tls_segment, | |
72ec2876 | 2516 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2517 | unsigned int, |
2518 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2519 | unsigned char* view, | |
fe8718a4 | 2520 | section_size_type view_size) |
2e30d253 | 2521 | { |
0ffd9845 ILT |
2522 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2523 | // .word 0x6666; rex64; call __tls_get_addr | |
2524 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2525 | |
72ec2876 ILT |
2526 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2527 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2528 | |
72ec2876 ILT |
2529 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2530 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2531 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2532 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2533 | |
0ffd9845 | 2534 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2535 | |
6a41d30b | 2536 | value -= tls_segment->memsz(); |
0ffd9845 | 2537 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2538 | |
2539 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2540 | // We can skip it. | |
2541 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2542 | } |
2543 | ||
c2b45e22 CC |
2544 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2545 | ||
2546 | inline void | |
2547 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2548 | const Relocate_info<64, false>* relinfo, | |
2549 | size_t relnum, | |
2550 | Output_segment*, | |
2551 | const elfcpp::Rela<64, false>& rela, | |
2552 | unsigned int r_type, | |
2553 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2554 | unsigned char* view, | |
2555 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2556 | section_size_type view_size) | |
2557 | { | |
2558 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2559 | { | |
2560 | // leaq foo@tlsdesc(%rip), %rax | |
2561 | // ==> movq foo@gottpoff(%rip), %rax | |
2562 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2563 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2564 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2565 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2566 | view[-2] = 0x8b; | |
2567 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2568 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2569 | } | |
2570 | else | |
2571 | { | |
2572 | // call *foo@tlscall(%rax) | |
2573 | // ==> nop; nop | |
2574 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2575 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2576 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2577 | view[0] == 0xff && view[1] == 0x10); | |
2578 | view[0] = 0x66; | |
2579 | view[1] = 0x90; | |
2580 | } | |
2581 | } | |
2582 | ||
2583 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2584 | ||
2585 | inline void | |
2586 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2587 | const Relocate_info<64, false>* relinfo, | |
2588 | size_t relnum, | |
2589 | Output_segment* tls_segment, | |
2590 | const elfcpp::Rela<64, false>& rela, | |
2591 | unsigned int r_type, | |
2592 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2593 | unsigned char* view, | |
2594 | section_size_type view_size) | |
2595 | { | |
2596 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2597 | { | |
2598 | // leaq foo@tlsdesc(%rip), %rax | |
2599 | // ==> movq foo@tpoff, %rax | |
2600 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2601 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2602 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2603 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2604 | view[-2] = 0xc7; | |
2605 | view[-1] = 0xc0; | |
2606 | value -= tls_segment->memsz(); | |
2607 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2608 | } | |
2609 | else | |
2610 | { | |
2611 | // call *foo@tlscall(%rax) | |
2612 | // ==> nop; nop | |
2613 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2614 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2615 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2616 | view[0] == 0xff && view[1] == 0x10); | |
2617 | view[0] = 0x66; | |
2618 | view[1] = 0x90; | |
2619 | } | |
2620 | } | |
2621 | ||
2e30d253 | 2622 | inline void |
72ec2876 ILT |
2623 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2624 | size_t relnum, | |
2625 | Output_segment*, | |
2626 | const elfcpp::Rela<64, false>& rela, | |
2627 | unsigned int, | |
2628 | elfcpp::Elf_types<64>::Elf_Addr, | |
2629 | unsigned char* view, | |
fe8718a4 | 2630 | section_size_type view_size) |
2e30d253 | 2631 | { |
72ec2876 ILT |
2632 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2633 | // ... leq foo@dtpoff(%rax),%reg | |
2634 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2635 | |
72ec2876 ILT |
2636 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2637 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2638 | |
72ec2876 ILT |
2639 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2640 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2641 | ||
2642 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2643 | ||
2644 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2645 | ||
2646 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2647 | // We can skip it. | |
2648 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2649 | } |
2650 | ||
56622147 ILT |
2651 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2652 | // Local-Exec. | |
2653 | ||
2654 | inline void | |
2655 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2656 | size_t relnum, | |
2657 | Output_segment* tls_segment, | |
2658 | const elfcpp::Rela<64, false>& rela, | |
2659 | unsigned int, | |
2660 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2661 | unsigned char* view, | |
fe8718a4 | 2662 | section_size_type view_size) |
56622147 ILT |
2663 | { |
2664 | // We need to examine the opcodes to figure out which instruction we | |
2665 | // are looking at. | |
2666 | ||
2667 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2668 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2669 | ||
2670 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2671 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2672 | ||
2673 | unsigned char op1 = view[-3]; | |
2674 | unsigned char op2 = view[-2]; | |
2675 | unsigned char op3 = view[-1]; | |
2676 | unsigned char reg = op3 >> 3; | |
2677 | ||
2678 | if (op2 == 0x8b) | |
2679 | { | |
2680 | // movq | |
2681 | if (op1 == 0x4c) | |
2682 | view[-3] = 0x49; | |
2683 | view[-2] = 0xc7; | |
2684 | view[-1] = 0xc0 | reg; | |
2685 | } | |
2686 | else if (reg == 4) | |
2687 | { | |
2688 | // Special handling for %rsp. | |
2689 | if (op1 == 0x4c) | |
2690 | view[-3] = 0x49; | |
2691 | view[-2] = 0x81; | |
2692 | view[-1] = 0xc0 | reg; | |
2693 | } | |
2694 | else | |
2695 | { | |
2696 | // addq | |
2697 | if (op1 == 0x4c) | |
2698 | view[-3] = 0x4d; | |
2699 | view[-2] = 0x8d; | |
2700 | view[-1] = 0x80 | reg | (reg << 3); | |
2701 | } | |
2702 | ||
6a41d30b | 2703 | value -= tls_segment->memsz(); |
56622147 ILT |
2704 | Relocate_functions<64, false>::rela32(view, value, 0); |
2705 | } | |
2706 | ||
2e30d253 ILT |
2707 | // Relocate section data. |
2708 | ||
2709 | void | |
364c7fa5 ILT |
2710 | Target_x86_64::relocate_section( |
2711 | const Relocate_info<64, false>* relinfo, | |
2712 | unsigned int sh_type, | |
2713 | const unsigned char* prelocs, | |
2714 | size_t reloc_count, | |
2715 | Output_section* output_section, | |
2716 | bool needs_special_offset_handling, | |
2717 | unsigned char* view, | |
2718 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2719 | section_size_type view_size, | |
2720 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2721 | { |
2722 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2723 | ||
2724 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2725 | Target_x86_64::Relocate>( | |
2726 | relinfo, | |
2727 | this, | |
2728 | prelocs, | |
2729 | reloc_count, | |
730cdc88 ILT |
2730 | output_section, |
2731 | needs_special_offset_handling, | |
2e30d253 ILT |
2732 | view, |
2733 | address, | |
364c7fa5 ILT |
2734 | view_size, |
2735 | reloc_symbol_changes); | |
2e30d253 ILT |
2736 | } |
2737 | ||
6a74a719 ILT |
2738 | // Return the size of a relocation while scanning during a relocatable |
2739 | // link. | |
2740 | ||
2741 | unsigned int | |
2742 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2743 | unsigned int r_type, | |
2744 | Relobj* object) | |
2745 | { | |
2746 | switch (r_type) | |
2747 | { | |
2748 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2749 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2750 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
2751 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2752 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2753 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2754 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2755 | case elfcpp::R_X86_64_DTPOFF32: | |
2756 | case elfcpp::R_X86_64_DTPOFF64: | |
2757 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2758 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2759 | return 0; | |
2760 | ||
2761 | case elfcpp::R_X86_64_64: | |
2762 | case elfcpp::R_X86_64_PC64: | |
2763 | case elfcpp::R_X86_64_GOTOFF64: | |
2764 | case elfcpp::R_X86_64_GOTPC64: | |
2765 | case elfcpp::R_X86_64_PLTOFF64: | |
2766 | case elfcpp::R_X86_64_GOT64: | |
2767 | case elfcpp::R_X86_64_GOTPCREL64: | |
2768 | case elfcpp::R_X86_64_GOTPCREL: | |
2769 | case elfcpp::R_X86_64_GOTPLT64: | |
2770 | return 8; | |
2771 | ||
2772 | case elfcpp::R_X86_64_32: | |
2773 | case elfcpp::R_X86_64_32S: | |
2774 | case elfcpp::R_X86_64_PC32: | |
2775 | case elfcpp::R_X86_64_PLT32: | |
2776 | case elfcpp::R_X86_64_GOTPC32: | |
2777 | case elfcpp::R_X86_64_GOT32: | |
2778 | return 4; | |
2779 | ||
2780 | case elfcpp::R_X86_64_16: | |
2781 | case elfcpp::R_X86_64_PC16: | |
2782 | return 2; | |
2783 | ||
2784 | case elfcpp::R_X86_64_8: | |
2785 | case elfcpp::R_X86_64_PC8: | |
2786 | return 1; | |
2787 | ||
2788 | case elfcpp::R_X86_64_COPY: | |
2789 | case elfcpp::R_X86_64_GLOB_DAT: | |
2790 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2791 | case elfcpp::R_X86_64_RELATIVE: | |
2792 | // These are outstanding tls relocs, which are unexpected when linking | |
2793 | case elfcpp::R_X86_64_TPOFF64: | |
2794 | case elfcpp::R_X86_64_DTPMOD64: | |
2795 | case elfcpp::R_X86_64_TLSDESC: | |
2796 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2797 | return 0; | |
2798 | ||
2799 | case elfcpp::R_X86_64_SIZE32: | |
2800 | case elfcpp::R_X86_64_SIZE64: | |
2801 | default: | |
2802 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2803 | return 0; | |
2804 | } | |
2805 | } | |
2806 | ||
2807 | // Scan the relocs during a relocatable link. | |
2808 | ||
2809 | void | |
ad0f2072 | 2810 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2811 | Layout* layout, |
2812 | Sized_relobj<64, false>* object, | |
2813 | unsigned int data_shndx, | |
2814 | unsigned int sh_type, | |
2815 | const unsigned char* prelocs, | |
2816 | size_t reloc_count, | |
2817 | Output_section* output_section, | |
2818 | bool needs_special_offset_handling, | |
2819 | size_t local_symbol_count, | |
2820 | const unsigned char* plocal_symbols, | |
2821 | Relocatable_relocs* rr) | |
2822 | { | |
2823 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2824 | ||
2825 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2826 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2827 | ||
7019cd25 | 2828 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 2829 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2830 | symtab, |
2831 | layout, | |
2832 | object, | |
2833 | data_shndx, | |
2834 | prelocs, | |
2835 | reloc_count, | |
2836 | output_section, | |
2837 | needs_special_offset_handling, | |
2838 | local_symbol_count, | |
2839 | plocal_symbols, | |
2840 | rr); | |
2841 | } | |
2842 | ||
2843 | // Relocate a section during a relocatable link. | |
2844 | ||
2845 | void | |
2846 | Target_x86_64::relocate_for_relocatable( | |
2847 | const Relocate_info<64, false>* relinfo, | |
2848 | unsigned int sh_type, | |
2849 | const unsigned char* prelocs, | |
2850 | size_t reloc_count, | |
2851 | Output_section* output_section, | |
2852 | off_t offset_in_output_section, | |
2853 | const Relocatable_relocs* rr, | |
2854 | unsigned char* view, | |
2855 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2856 | section_size_type view_size, | |
2857 | unsigned char* reloc_view, | |
2858 | section_size_type reloc_view_size) | |
2859 | { | |
2860 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2861 | ||
7019cd25 | 2862 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2863 | relinfo, |
2864 | prelocs, | |
2865 | reloc_count, | |
2866 | output_section, | |
2867 | offset_in_output_section, | |
2868 | rr, | |
2869 | view, | |
2870 | view_address, | |
2871 | view_size, | |
2872 | reloc_view, | |
2873 | reloc_view_size); | |
2874 | } | |
2875 | ||
4fb6c25d ILT |
2876 | // Return the value to use for a dynamic which requires special |
2877 | // treatment. This is how we support equality comparisons of function | |
2878 | // pointers across shared library boundaries, as described in the | |
2879 | // processor specific ABI supplement. | |
2880 | ||
2881 | uint64_t | |
2882 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2883 | { | |
2884 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2885 | return this->plt_section()->address() + gsym->plt_offset(); | |
2886 | } | |
2887 | ||
2e30d253 ILT |
2888 | // Return a string used to fill a code section with nops to take up |
2889 | // the specified length. | |
2890 | ||
2891 | std::string | |
8851ecca | 2892 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2893 | { |
2894 | if (length >= 16) | |
2895 | { | |
2896 | // Build a jmpq instruction to skip over the bytes. | |
2897 | unsigned char jmp[5]; | |
2898 | jmp[0] = 0xe9; | |
04bf7072 | 2899 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2900 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2901 | + std::string(length - 5, '\0')); | |
2902 | } | |
2903 | ||
2904 | // Nop sequences of various lengths. | |
2905 | const char nop1[1] = { 0x90 }; // nop | |
2906 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2907 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2908 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2909 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2910 | 0x00 }; | |
2911 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2912 | 0x00, 0x00 }; |
1caf2c51 | 2913 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2914 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2915 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2916 | 0x00, 0x00, 0x00, 0x00 }; | |
2917 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2918 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2919 | 0x00 }; |
1caf2c51 ILT |
2920 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2921 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2922 | 0x00, 0x00 }; |
1caf2c51 ILT |
2923 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2924 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2925 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2926 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2927 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2928 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2929 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2930 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2931 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2932 | 0x00 }; |
1caf2c51 ILT |
2933 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2934 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2935 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2936 | 0x00, 0x00 }; |
1caf2c51 ILT |
2937 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2938 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2939 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2940 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2941 | |
2942 | const char* nops[16] = { | |
2943 | NULL, | |
2944 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2945 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2946 | }; | |
2947 | ||
2948 | return std::string(nops[length], length); | |
2949 | } | |
2950 | ||
e291e7b9 ILT |
2951 | // Return the addend to use for a target specific relocation. The |
2952 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
2953 | // symbol. We want to set the addend is the offset of the local | |
2954 | // symbol in the TLS segment. | |
2955 | ||
2956 | uint64_t | |
2957 | Target_x86_64::do_reloc_addend(void* arg, unsigned int r_type, | |
2958 | uint64_t) const | |
2959 | { | |
2960 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
2961 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
2962 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
2963 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
2964 | const Symbol_value<64>* psymval = ti.object->local_symbol(ti.r_sym); | |
2965 | gold_assert(psymval->is_tls_symbol()); | |
2966 | // The value of a TLS symbol is the offset in the TLS segment. | |
2967 | return psymval->value(ti.object, 0); | |
2968 | } | |
2969 | ||
364c7fa5 ILT |
2970 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2971 | // compiled with -fstack-split. The function calls non-stack-split | |
2972 | // code. We have to change the function so that it always ensures | |
2973 | // that it has enough stack space to run some random function. | |
2974 | ||
2975 | void | |
2976 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2977 | section_offset_type fnoffset, | |
2978 | section_size_type fnsize, | |
2979 | unsigned char* view, | |
2980 | section_size_type view_size, | |
2981 | std::string* from, | |
2982 | std::string* to) const | |
2983 | { | |
2984 | // The function starts with a comparison of the stack pointer and a | |
2985 | // field in the TCB. This is followed by a jump. | |
2986 | ||
2987 | // cmp %fs:NN,%rsp | |
2988 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
2989 | && fnsize > 9) | |
2990 | { | |
2991 | // We will call __morestack if the carry flag is set after this | |
2992 | // comparison. We turn the comparison into an stc instruction | |
2993 | // and some nops. | |
2994 | view[fnoffset] = '\xf9'; | |
2995 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
2996 | } | |
2997 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
2998 | // lea NN(%rsp),%r11 |
2999 | else if ((this->match_view(view, view_size, fnoffset, | |
3000 | "\x4c\x8d\x94\x24", 4) | |
3001 | || this->match_view(view, view_size, fnoffset, | |
3002 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
3003 | && fnsize > 8) |
3004 | { | |
3005 | // This is loading an offset from the stack pointer for a | |
3006 | // comparison. The offset is negative, so we decrease the | |
3007 | // offset by the amount of space we need for the stack. This | |
3008 | // means we will avoid calling __morestack if there happens to | |
3009 | // be plenty of space on the stack already. | |
3010 | unsigned char* pval = view + fnoffset + 4; | |
3011 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3012 | val -= parameters->options().split_stack_adjust_size(); | |
3013 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3014 | } | |
3015 | else | |
3016 | { | |
3017 | if (!object->has_no_split_stack()) | |
3018 | object->error(_("failed to match split-stack sequence at " | |
3019 | "section %u offset %0zx"), | |
ac33a407 | 3020 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3021 | return; |
3022 | } | |
3023 | ||
3024 | // We have to change the function so that it calls | |
3025 | // __morestack_non_split instead of __morestack. The former will | |
3026 | // allocate additional stack space. | |
3027 | *from = "__morestack"; | |
3028 | *to = "__morestack_non_split"; | |
3029 | } | |
3030 | ||
2e30d253 ILT |
3031 | // The selector for x86_64 object files. |
3032 | ||
36959681 | 3033 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
3034 | { |
3035 | public: | |
3036 | Target_selector_x86_64() | |
36959681 ILT |
3037 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
3038 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
3039 | { } |
3040 | ||
3041 | Target* | |
e96caa79 ILT |
3042 | do_instantiate_target() |
3043 | { return new Target_x86_64(); } | |
36959681 | 3044 | |
2e30d253 ILT |
3045 | }; |
3046 | ||
2e30d253 ILT |
3047 | Target_selector_x86_64 target_selector_x86_64; |
3048 | ||
3049 | } // End anonymous namespace. |