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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
6d03d481 | 3 | // Copyright 2006, 2007, 2008, 2009 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), |
e785ec03 ILT |
67 | got_(NULL), plt_(NULL), got_plt_(NULL), global_offset_table_(NULL), |
68 | rela_dyn_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), | |
e291e7b9 ILT |
69 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
70 | tls_base_symbol_defined_(false) | |
2e30d253 ILT |
71 | { } |
72 | ||
21bb3914 ST |
73 | // This function should be defined in targets that can use relocation |
74 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
75 | // and global_reloc_may_be_function_pointer) | |
76 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
77 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
78 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
79 | inline bool | |
80 | can_check_for_function_pointers() const | |
81 | { return !parameters->options().pie(); } | |
82 | ||
8a5e3e08 ILT |
83 | // Hook for a new output section. |
84 | void | |
85 | do_new_output_section(Output_section*) const; | |
86 | ||
6d03d481 ST |
87 | // Scan the relocations to look for symbol adjustments. |
88 | void | |
ad0f2072 | 89 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
90 | Layout* layout, |
91 | Sized_relobj<64, false>* object, | |
92 | unsigned int data_shndx, | |
93 | unsigned int sh_type, | |
94 | const unsigned char* prelocs, | |
95 | size_t reloc_count, | |
96 | Output_section* output_section, | |
97 | bool needs_special_offset_handling, | |
98 | size_t local_symbol_count, | |
99 | const unsigned char* plocal_symbols); | |
100 | ||
2e30d253 ILT |
101 | // Scan the relocations to look for symbol adjustments. |
102 | void | |
ad0f2072 | 103 | scan_relocs(Symbol_table* symtab, |
2e30d253 ILT |
104 | Layout* layout, |
105 | Sized_relobj<64, false>* object, | |
106 | unsigned int data_shndx, | |
107 | unsigned int sh_type, | |
108 | const unsigned char* prelocs, | |
109 | size_t reloc_count, | |
730cdc88 ILT |
110 | Output_section* output_section, |
111 | bool needs_special_offset_handling, | |
2e30d253 | 112 | size_t local_symbol_count, |
730cdc88 | 113 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
114 | |
115 | // Finalize the sections. | |
116 | void | |
f59f41f3 | 117 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 118 | |
4fb6c25d ILT |
119 | // Return the value to use for a dynamic which requires special |
120 | // treatment. | |
121 | uint64_t | |
122 | do_dynsym_value(const Symbol*) const; | |
123 | ||
2e30d253 ILT |
124 | // Relocate a section. |
125 | void | |
126 | relocate_section(const Relocate_info<64, false>*, | |
127 | unsigned int sh_type, | |
128 | const unsigned char* prelocs, | |
129 | size_t reloc_count, | |
730cdc88 ILT |
130 | Output_section* output_section, |
131 | bool needs_special_offset_handling, | |
2e30d253 ILT |
132 | unsigned char* view, |
133 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
134 | section_size_type view_size, |
135 | const Reloc_symbol_changes*); | |
2e30d253 | 136 | |
6a74a719 ILT |
137 | // Scan the relocs during a relocatable link. |
138 | void | |
ad0f2072 | 139 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
140 | Layout* layout, |
141 | Sized_relobj<64, false>* object, | |
142 | unsigned int data_shndx, | |
143 | unsigned int sh_type, | |
144 | const unsigned char* prelocs, | |
145 | size_t reloc_count, | |
146 | Output_section* output_section, | |
147 | bool needs_special_offset_handling, | |
148 | size_t local_symbol_count, | |
149 | const unsigned char* plocal_symbols, | |
150 | Relocatable_relocs*); | |
151 | ||
152 | // Relocate a section during a relocatable link. | |
153 | void | |
154 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
155 | unsigned int sh_type, | |
156 | const unsigned char* prelocs, | |
157 | size_t reloc_count, | |
158 | Output_section* output_section, | |
159 | off_t offset_in_output_section, | |
160 | const Relocatable_relocs*, | |
161 | unsigned char* view, | |
162 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
163 | section_size_type view_size, | |
164 | unsigned char* reloc_view, | |
165 | section_size_type reloc_view_size); | |
166 | ||
2e30d253 ILT |
167 | // Return a string used to fill a code section with nops. |
168 | std::string | |
8851ecca | 169 | do_code_fill(section_size_type length) const; |
2e30d253 | 170 | |
9a2d6984 ILT |
171 | // Return whether SYM is defined by the ABI. |
172 | bool | |
9c2d0ef9 | 173 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
174 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
175 | ||
e291e7b9 ILT |
176 | // Return the symbol index to use for a target specific relocation. |
177 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
178 | // local symbol, which is an absolute reloc. | |
179 | unsigned int | |
180 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
181 | { | |
182 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | // Return the addend to use for a target specific relocation. | |
187 | uint64_t | |
188 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
189 | ||
364c7fa5 ILT |
190 | // Adjust -fstack-split code which calls non-stack-split code. |
191 | void | |
192 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
193 | section_offset_type fnoffset, section_size_type fnsize, | |
194 | unsigned char* view, section_size_type view_size, | |
195 | std::string* from, std::string* to) const; | |
196 | ||
96f2030e | 197 | // Return the size of the GOT section. |
fe8718a4 | 198 | section_size_type |
96f2030e ILT |
199 | got_size() |
200 | { | |
201 | gold_assert(this->got_ != NULL); | |
202 | return this->got_->data_size(); | |
203 | } | |
204 | ||
e291e7b9 ILT |
205 | // Add a new reloc argument, returning the index in the vector. |
206 | size_t | |
207 | add_tlsdesc_info(Sized_relobj<64, false>* object, unsigned int r_sym) | |
208 | { | |
209 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
210 | return this->tlsdesc_reloc_info_.size() - 1; | |
211 | } | |
212 | ||
2e30d253 ILT |
213 | private: |
214 | // The class which scans relocations. | |
a036edd8 | 215 | class Scan |
2e30d253 | 216 | { |
a036edd8 ILT |
217 | public: |
218 | Scan() | |
219 | : issued_non_pic_error_(false) | |
220 | { } | |
221 | ||
2e30d253 | 222 | inline void |
ad0f2072 | 223 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
224 | Sized_relobj<64, false>* object, |
225 | unsigned int data_shndx, | |
07f397ab | 226 | Output_section* output_section, |
2e30d253 ILT |
227 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
228 | const elfcpp::Sym<64, false>& lsym); | |
229 | ||
230 | inline void | |
ad0f2072 | 231 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
232 | Sized_relobj<64, false>* object, |
233 | unsigned int data_shndx, | |
07f397ab | 234 | Output_section* output_section, |
2e30d253 ILT |
235 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
236 | Symbol* gsym); | |
e041f13d | 237 | |
21bb3914 ST |
238 | inline bool |
239 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
240 | Target_x86_64* target, | |
241 | Sized_relobj<64, false>* object, | |
242 | unsigned int data_shndx, | |
243 | Output_section* output_section, | |
244 | const elfcpp::Rela<64, false>& reloc, | |
245 | unsigned int r_type, | |
246 | const elfcpp::Sym<64, false>& lsym); | |
247 | ||
248 | inline bool | |
249 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
250 | Target_x86_64* target, | |
251 | Sized_relobj<64, false>* object, | |
252 | unsigned int data_shndx, | |
253 | Output_section* output_section, | |
254 | const elfcpp::Rela<64, false>& reloc, | |
255 | unsigned int r_type, | |
256 | Symbol* gsym); | |
257 | ||
a036edd8 | 258 | private: |
e041f13d ILT |
259 | static void |
260 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
261 | ||
262 | static void | |
263 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
264 | Symbol*); | |
a036edd8 ILT |
265 | |
266 | void | |
267 | check_non_pic(Relobj*, unsigned int r_type); | |
268 | ||
21bb3914 ST |
269 | inline bool |
270 | possible_function_pointer_reloc(unsigned int r_type); | |
271 | ||
a036edd8 ILT |
272 | // Whether we have issued an error about a non-PIC compilation. |
273 | bool issued_non_pic_error_; | |
2e30d253 ILT |
274 | }; |
275 | ||
276 | // The class which implements relocation. | |
277 | class Relocate | |
278 | { | |
279 | public: | |
280 | Relocate() | |
497897f9 | 281 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
282 | { } |
283 | ||
284 | ~Relocate() | |
285 | { | |
286 | if (this->skip_call_tls_get_addr_) | |
287 | { | |
288 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 289 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
290 | } |
291 | } | |
292 | ||
293 | // Do a relocation. Return false if the caller should not issue | |
294 | // any warnings about this relocation. | |
295 | inline bool | |
031cdbed ILT |
296 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
297 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
298 | unsigned int r_type, const Sized_symbol<64>*, |
299 | const Symbol_value<64>*, | |
300 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 301 | section_size_type); |
2e30d253 ILT |
302 | |
303 | private: | |
304 | // Do a TLS relocation. | |
305 | inline void | |
7bf1f802 ILT |
306 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
307 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
308 | unsigned int r_type, const Sized_symbol<64>*, |
309 | const Symbol_value<64>*, | |
fe8718a4 ILT |
310 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
311 | section_size_type); | |
2e30d253 | 312 | |
c2b45e22 | 313 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
314 | inline void |
315 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
316 | Output_segment* tls_segment, | |
317 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
318 | elfcpp::Elf_types<64>::Elf_Addr value, | |
319 | unsigned char* view, | |
c2b45e22 | 320 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 321 | section_size_type view_size); |
7bf1f802 | 322 | |
56622147 ILT |
323 | // Do a TLS General-Dynamic to Local-Exec transition. |
324 | inline void | |
325 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
326 | Output_segment* tls_segment, |
327 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
328 | elfcpp::Elf_types<64>::Elf_Addr value, | |
329 | unsigned char* view, | |
fe8718a4 | 330 | section_size_type view_size); |
2e30d253 | 331 | |
c2b45e22 CC |
332 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
333 | inline void | |
334 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
335 | Output_segment* tls_segment, | |
336 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
337 | elfcpp::Elf_types<64>::Elf_Addr value, | |
338 | unsigned char* view, | |
339 | elfcpp::Elf_types<64>::Elf_Addr, | |
340 | section_size_type view_size); | |
341 | ||
342 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
343 | inline void | |
344 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
345 | Output_segment* tls_segment, | |
346 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
347 | elfcpp::Elf_types<64>::Elf_Addr value, | |
348 | unsigned char* view, | |
349 | section_size_type view_size); | |
350 | ||
56622147 | 351 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 352 | inline void |
56622147 | 353 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
354 | Output_segment* tls_segment, |
355 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
356 | elfcpp::Elf_types<64>::Elf_Addr value, | |
357 | unsigned char* view, | |
fe8718a4 | 358 | section_size_type view_size); |
2e30d253 | 359 | |
56622147 ILT |
360 | // Do a TLS Initial-Exec to Local-Exec transition. |
361 | static inline void | |
362 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
363 | Output_segment* tls_segment, |
364 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
365 | elfcpp::Elf_types<64>::Elf_Addr value, | |
366 | unsigned char* view, | |
fe8718a4 | 367 | section_size_type view_size); |
2e30d253 ILT |
368 | |
369 | // This is set if we should skip the next reloc, which should be a | |
370 | // PLT32 reloc against ___tls_get_addr. | |
371 | bool skip_call_tls_get_addr_; | |
497897f9 ILT |
372 | |
373 | // This is set if we see a relocation which could load the address | |
374 | // of the TLS block. Whether we see such a relocation determines | |
375 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
376 | // in debugging sections. | |
377 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
378 | }; |
379 | ||
6a74a719 ILT |
380 | // A class which returns the size required for a relocation type, |
381 | // used while scanning relocs during a relocatable link. | |
382 | class Relocatable_size_for_reloc | |
383 | { | |
384 | public: | |
385 | unsigned int | |
386 | get_size_for_reloc(unsigned int, Relobj*); | |
387 | }; | |
388 | ||
2e30d253 ILT |
389 | // Adjust TLS relocation type based on the options and whether this |
390 | // is a local symbol. | |
e041f13d | 391 | static tls::Tls_optimization |
2e30d253 ILT |
392 | optimize_tls_reloc(bool is_final, int r_type); |
393 | ||
394 | // Get the GOT section, creating it if necessary. | |
395 | Output_data_got<64, false>* | |
396 | got_section(Symbol_table*, Layout*); | |
397 | ||
96f2030e ILT |
398 | // Get the GOT PLT section. |
399 | Output_data_space* | |
400 | got_plt_section() const | |
401 | { | |
402 | gold_assert(this->got_plt_ != NULL); | |
403 | return this->got_plt_; | |
404 | } | |
405 | ||
c2b45e22 CC |
406 | // Create the PLT section. |
407 | void | |
408 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
409 | ||
2e30d253 ILT |
410 | // Create a PLT entry for a global symbol. |
411 | void | |
412 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
413 | ||
9fa33bee | 414 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
415 | void |
416 | define_tls_base_symbol(Symbol_table*, Layout*); | |
417 | ||
c2b45e22 CC |
418 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
419 | void | |
420 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
421 | ||
31d60480 ILT |
422 | // Create a GOT entry for the TLS module index. |
423 | unsigned int | |
424 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
425 | Sized_relobj<64, false>* object); | |
426 | ||
2e30d253 ILT |
427 | // Get the PLT section. |
428 | Output_data_plt_x86_64* | |
429 | plt_section() const | |
430 | { | |
431 | gold_assert(this->plt_ != NULL); | |
432 | return this->plt_; | |
433 | } | |
434 | ||
435 | // Get the dynamic reloc section, creating it if necessary. | |
436 | Reloc_section* | |
0ffd9845 | 437 | rela_dyn_section(Layout*); |
2e30d253 | 438 | |
e291e7b9 ILT |
439 | // Get the section to use for TLSDESC relocations. |
440 | Reloc_section* | |
441 | rela_tlsdesc_section(Layout*) const; | |
442 | ||
12c0daef | 443 | // Add a potential copy relocation. |
2e30d253 | 444 | void |
ef9beddf ILT |
445 | copy_reloc(Symbol_table* symtab, Layout* layout, |
446 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
447 | unsigned int shndx, Output_section* output_section, |
448 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
449 | { | |
450 | this->copy_relocs_.copy_reloc(symtab, layout, | |
451 | symtab->get_sized_symbol<64>(sym), | |
452 | object, shndx, output_section, | |
453 | reloc, this->rela_dyn_section(layout)); | |
454 | } | |
2e30d253 ILT |
455 | |
456 | // Information about this specific target which we pass to the | |
457 | // general Target structure. | |
458 | static const Target::Target_info x86_64_info; | |
459 | ||
0a65a3a7 CC |
460 | enum Got_type |
461 | { | |
462 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
463 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
464 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
465 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
466 | }; | |
467 | ||
e291e7b9 ILT |
468 | // This type is used as the argument to the target specific |
469 | // relocation routines. The only target specific reloc is | |
470 | // R_X86_64_TLSDESC against a local symbol. | |
471 | struct Tlsdesc_info | |
472 | { | |
473 | Tlsdesc_info(Sized_relobj<64, false>* a_object, unsigned int a_r_sym) | |
474 | : object(a_object), r_sym(a_r_sym) | |
475 | { } | |
476 | ||
477 | // The object in which the local symbol is defined. | |
478 | Sized_relobj<64, false>* object; | |
479 | // The local symbol index in the object. | |
480 | unsigned int r_sym; | |
481 | }; | |
482 | ||
2e30d253 ILT |
483 | // The GOT section. |
484 | Output_data_got<64, false>* got_; | |
485 | // The PLT section. | |
486 | Output_data_plt_x86_64* plt_; | |
487 | // The GOT PLT section. | |
488 | Output_data_space* got_plt_; | |
e785ec03 ILT |
489 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
490 | Symbol* global_offset_table_; | |
2e30d253 | 491 | // The dynamic reloc section. |
0ffd9845 | 492 | Reloc_section* rela_dyn_; |
2e30d253 | 493 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 494 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
495 | // Space for variables copied with a COPY reloc. |
496 | Output_data_space* dynbss_; | |
c2b45e22 | 497 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 498 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
499 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
500 | // specific relocation. Here we store the object and local symbol | |
501 | // index for the relocation. | |
502 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
503 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
504 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
505 | }; |
506 | ||
507 | const Target::Target_info Target_x86_64::x86_64_info = | |
508 | { | |
509 | 64, // size | |
510 | false, // is_big_endian | |
511 | elfcpp::EM_X86_64, // machine_code | |
512 | false, // has_make_symbol | |
513 | false, // has_resolve | |
514 | true, // has_code_fill | |
35cdfc9a | 515 | true, // is_default_stack_executable |
0864d551 | 516 | '\0', // wrap_char |
2e30d253 | 517 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 518 | 0x400000, // default_text_segment_address |
cd72c291 | 519 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
520 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
521 | elfcpp::SHN_UNDEF, // small_common_shndx | |
522 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
523 | 0, // small_common_section_flags | |
05a352e6 DK |
524 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
525 | NULL, // attributes_section | |
526 | NULL // attributes_vendor | |
2e30d253 ILT |
527 | }; |
528 | ||
8a5e3e08 ILT |
529 | // This is called when a new output section is created. This is where |
530 | // we handle the SHF_X86_64_LARGE. | |
531 | ||
532 | void | |
533 | Target_x86_64::do_new_output_section(Output_section *os) const | |
534 | { | |
535 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
536 | os->set_is_large_section(); | |
537 | } | |
538 | ||
2e30d253 ILT |
539 | // Get the GOT section, creating it if necessary. |
540 | ||
541 | Output_data_got<64, false>* | |
542 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
543 | { | |
544 | if (this->got_ == NULL) | |
545 | { | |
546 | gold_assert(symtab != NULL && layout != NULL); | |
547 | ||
548 | this->got_ = new Output_data_got<64, false>(); | |
549 | ||
82742395 ILT |
550 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
551 | (elfcpp::SHF_ALLOC | |
552 | | elfcpp::SHF_WRITE), | |
553 | this->got_, false, true, true, false); | |
2e30d253 | 554 | |
7d9e3d98 | 555 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
556 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
557 | (elfcpp::SHF_ALLOC | |
558 | | elfcpp::SHF_WRITE), | |
559 | this->got_plt_, false, false, false, | |
560 | true); | |
2e30d253 ILT |
561 | |
562 | // The first three entries are reserved. | |
27bc2bce | 563 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 564 | |
1a2dff53 ILT |
565 | // Those bytes can go into the relro segment. |
566 | layout->increase_relro(3 * 8); | |
567 | ||
2e30d253 | 568 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
569 | this->global_offset_table_ = |
570 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
571 | Symbol_table::PREDEFINED, | |
572 | this->got_plt_, | |
573 | 0, 0, elfcpp::STT_OBJECT, | |
574 | elfcpp::STB_LOCAL, | |
575 | elfcpp::STV_HIDDEN, 0, | |
576 | false, false); | |
2e30d253 ILT |
577 | } |
578 | ||
579 | return this->got_; | |
580 | } | |
581 | ||
582 | // Get the dynamic reloc section, creating it if necessary. | |
583 | ||
584 | Target_x86_64::Reloc_section* | |
0ffd9845 | 585 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 586 | { |
0ffd9845 | 587 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
588 | { |
589 | gold_assert(layout != NULL); | |
d98bc257 | 590 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 591 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
1a2dff53 ILT |
592 | elfcpp::SHF_ALLOC, this->rela_dyn_, true, |
593 | false, false, false); | |
2e30d253 | 594 | } |
0ffd9845 | 595 | return this->rela_dyn_; |
2e30d253 ILT |
596 | } |
597 | ||
598 | // A class to handle the PLT data. | |
599 | ||
600 | class Output_data_plt_x86_64 : public Output_section_data | |
601 | { | |
602 | public: | |
603 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
604 | ||
c2b45e22 CC |
605 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
606 | Output_data_space*); | |
2e30d253 ILT |
607 | |
608 | // Add an entry to the PLT. | |
609 | void | |
610 | add_entry(Symbol* gsym); | |
611 | ||
c2b45e22 CC |
612 | // Add the reserved TLSDESC_PLT entry to the PLT. |
613 | void | |
614 | reserve_tlsdesc_entry(unsigned int got_offset) | |
615 | { this->tlsdesc_got_offset_ = got_offset; } | |
616 | ||
617 | // Return true if a TLSDESC_PLT entry has been reserved. | |
618 | bool | |
619 | has_tlsdesc_entry() const | |
620 | { return this->tlsdesc_got_offset_ != -1U; } | |
621 | ||
622 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
623 | unsigned int | |
624 | get_tlsdesc_got_offset() const | |
625 | { return this->tlsdesc_got_offset_; } | |
626 | ||
627 | // Return the offset of the reserved TLSDESC_PLT entry. | |
628 | unsigned int | |
629 | get_tlsdesc_plt_offset() const | |
630 | { return (this->count_ + 1) * plt_entry_size; } | |
631 | ||
e291e7b9 | 632 | // Return the .rela.plt section data. |
2e30d253 | 633 | const Reloc_section* |
e291e7b9 | 634 | rela_plt() const |
2e30d253 ILT |
635 | { return this->rel_; } |
636 | ||
e291e7b9 ILT |
637 | // Return where the TLSDESC relocations should go. |
638 | Reloc_section* | |
639 | rela_tlsdesc(Layout*); | |
640 | ||
2e30d253 ILT |
641 | protected: |
642 | void | |
643 | do_adjust_output_section(Output_section* os); | |
644 | ||
7d9e3d98 ILT |
645 | // Write to a map file. |
646 | void | |
647 | do_print_to_mapfile(Mapfile* mapfile) const | |
648 | { mapfile->print_output_data(this, _("** PLT")); } | |
649 | ||
2e30d253 ILT |
650 | private: |
651 | // The size of an entry in the PLT. | |
652 | static const int plt_entry_size = 16; | |
653 | ||
654 | // The first entry in the PLT. | |
655 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
656 | // procedure linkage table for both programs and shared objects." | |
657 | static unsigned char first_plt_entry[plt_entry_size]; | |
658 | ||
659 | // Other entries in the PLT for an executable. | |
660 | static unsigned char plt_entry[plt_entry_size]; | |
661 | ||
c2b45e22 CC |
662 | // The reserved TLSDESC entry in the PLT for an executable. |
663 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
664 | ||
2e30d253 ILT |
665 | // Set the final size. |
666 | void | |
c2b45e22 | 667 | set_final_data_size(); |
2e30d253 ILT |
668 | |
669 | // Write out the PLT data. | |
670 | void | |
671 | do_write(Output_file*); | |
672 | ||
673 | // The reloc section. | |
674 | Reloc_section* rel_; | |
e291e7b9 ILT |
675 | // The TLSDESC relocs, if necessary. These must follow the regular |
676 | // PLT relocs. | |
677 | Reloc_section* tlsdesc_rel_; | |
c2b45e22 CC |
678 | // The .got section. |
679 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
680 | // The .got.plt section. |
681 | Output_data_space* got_plt_; | |
682 | // The number of PLT entries. | |
683 | unsigned int count_; | |
c2b45e22 CC |
684 | // Offset of the reserved TLSDESC_GOT entry when needed. |
685 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
686 | }; |
687 | ||
688 | // Create the PLT section. The ordinary .got section is an argument, | |
689 | // since we need to refer to the start. We also create our own .got | |
690 | // section just for PLT entries. | |
691 | ||
692 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 693 | Output_data_got<64, false>* got, |
2e30d253 | 694 | Output_data_space* got_plt) |
e291e7b9 ILT |
695 | : Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), |
696 | count_(0), tlsdesc_got_offset_(-1U) | |
2e30d253 | 697 | { |
d98bc257 | 698 | this->rel_ = new Reloc_section(false); |
2e30d253 | 699 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
1a2dff53 ILT |
700 | elfcpp::SHF_ALLOC, this->rel_, true, |
701 | false, false, false); | |
2e30d253 ILT |
702 | } |
703 | ||
704 | void | |
705 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
706 | { | |
b0481b0b | 707 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
708 | } |
709 | ||
710 | // Add an entry to the PLT. | |
711 | ||
712 | void | |
713 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
714 | { | |
715 | gold_assert(!gsym->has_plt_offset()); | |
716 | ||
717 | // Note that when setting the PLT offset we skip the initial | |
718 | // reserved PLT entry. | |
719 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
720 | ||
721 | ++this->count_; | |
722 | ||
fe8718a4 | 723 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
724 | |
725 | // Every PLT entry needs a GOT entry which points back to the PLT | |
726 | // entry (this will be changed by the dynamic linker, normally | |
727 | // lazily when the function is called). | |
27bc2bce | 728 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
729 | |
730 | // Every PLT entry needs a reloc. | |
731 | gsym->set_needs_dynsym_entry(); | |
732 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
733 | got_offset, 0); | |
734 | ||
735 | // Note that we don't need to save the symbol. The contents of the | |
736 | // PLT are independent of which symbols are used. The symbols only | |
737 | // appear in the relocations. | |
738 | } | |
739 | ||
e291e7b9 ILT |
740 | // Return where the TLSDESC relocations should go, creating it if |
741 | // necessary. These follow the JUMP_SLOT relocations. | |
742 | ||
743 | Output_data_plt_x86_64::Reloc_section* | |
744 | Output_data_plt_x86_64::rela_tlsdesc(Layout* layout) | |
745 | { | |
746 | if (this->tlsdesc_rel_ == NULL) | |
747 | { | |
748 | this->tlsdesc_rel_ = new Reloc_section(false); | |
749 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
750 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
751 | true, false, false, false); | |
752 | gold_assert(this->tlsdesc_rel_->output_section() == | |
753 | this->rel_->output_section()); | |
754 | } | |
755 | return this->tlsdesc_rel_; | |
756 | } | |
757 | ||
c2b45e22 CC |
758 | // Set the final size. |
759 | void | |
760 | Output_data_plt_x86_64::set_final_data_size() | |
761 | { | |
762 | unsigned int count = this->count_; | |
763 | if (this->has_tlsdesc_entry()) | |
764 | ++count; | |
765 | this->set_data_size((count + 1) * plt_entry_size); | |
766 | } | |
767 | ||
2e30d253 ILT |
768 | // The first entry in the PLT for an executable. |
769 | ||
770 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
771 | { | |
772 | // From AMD64 ABI Draft 0.98, page 76 | |
773 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 774 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
775 | 0xff, 0x25, // jmp indirect |
776 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
777 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
778 | }; | |
779 | ||
780 | // Subsequent entries in the PLT for an executable. | |
781 | ||
782 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
783 | { | |
784 | // From AMD64 ABI Draft 0.98, page 76 | |
785 | 0xff, 0x25, // jmpq indirect | |
786 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
787 | 0x68, // pushq immediate | |
788 | 0, 0, 0, 0, // replaced with offset into relocation table | |
789 | 0xe9, // jmpq relative | |
790 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
791 | }; | |
792 | ||
c2b45e22 CC |
793 | // The reserved TLSDESC entry in the PLT for an executable. |
794 | ||
795 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
796 | { | |
797 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
798 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
799 | 0xff, 0x35, // pushq x(%rip) | |
800 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
801 | 0xff, 0x25, // jmpq *y(%rip) | |
802 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
803 | 0x0f, 0x1f, // nop | |
804 | 0x40, 0 | |
805 | }; | |
806 | ||
2e30d253 ILT |
807 | // Write out the PLT. This uses the hand-coded instructions above, |
808 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
809 | ||
810 | void | |
811 | Output_data_plt_x86_64::do_write(Output_file* of) | |
812 | { | |
2ea97941 | 813 | const off_t offset = this->offset(); |
fe8718a4 ILT |
814 | const section_size_type oview_size = |
815 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 816 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
817 | |
818 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
819 | const section_size_type got_size = |
820 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
821 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
822 | got_size); | |
823 | ||
824 | unsigned char* pov = oview; | |
825 | ||
c2b45e22 | 826 | // The base address of the .plt section. |
a984ee1d | 827 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 828 | // The base address of the .got section. |
a984ee1d | 829 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
830 | // The base address of the PLT portion of the .got section, |
831 | // which is where the GOT pointer will point, and where the | |
832 | // three reserved GOT entries are located. | |
a984ee1d | 833 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
834 | |
835 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 836 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
837 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
838 | (got_address + 8 | |
839 | - (plt_address + 6))); | |
840 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
841 | (got_address + 16 | |
842 | - (plt_address + 12))); | |
2e30d253 ILT |
843 | pov += plt_entry_size; |
844 | ||
845 | unsigned char* got_pov = got_view; | |
846 | ||
847 | memset(got_pov, 0, 24); | |
848 | got_pov += 24; | |
849 | ||
850 | unsigned int plt_offset = plt_entry_size; | |
851 | unsigned int got_offset = 24; | |
852 | const unsigned int count = this->count_; | |
853 | for (unsigned int plt_index = 0; | |
854 | plt_index < count; | |
855 | ++plt_index, | |
856 | pov += plt_entry_size, | |
857 | got_pov += 8, | |
858 | plt_offset += plt_entry_size, | |
859 | got_offset += 8) | |
860 | { | |
861 | // Set and adjust the PLT entry itself. | |
862 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
863 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
864 | (got_address + got_offset | |
865 | - (plt_address + plt_offset | |
866 | + 6))); | |
2e30d253 ILT |
867 | |
868 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
869 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
870 | - (plt_offset + plt_entry_size)); | |
871 | ||
872 | // Set the entry in the GOT. | |
873 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
874 | } | |
875 | ||
c2b45e22 CC |
876 | if (this->has_tlsdesc_entry()) |
877 | { | |
878 | // Set and adjust the reserved TLSDESC PLT entry. | |
879 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
880 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
881 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
882 | (got_address + 8 | |
883 | - (plt_address + plt_offset | |
884 | + 6))); | |
885 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
886 | (got_base | |
887 | + tlsdesc_got_offset | |
888 | - (plt_address + plt_offset | |
889 | + 12))); | |
890 | pov += plt_entry_size; | |
891 | } | |
892 | ||
fe8718a4 ILT |
893 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
894 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 895 | |
2ea97941 | 896 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
897 | of->write_output_view(got_file_offset, got_size, got_view); |
898 | } | |
899 | ||
c2b45e22 | 900 | // Create the PLT section. |
2e30d253 ILT |
901 | |
902 | void | |
c2b45e22 | 903 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 904 | { |
2e30d253 ILT |
905 | if (this->plt_ == NULL) |
906 | { | |
907 | // Create the GOT sections first. | |
908 | this->got_section(symtab, layout); | |
909 | ||
c2b45e22 CC |
910 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
911 | this->got_plt_); | |
2e30d253 ILT |
912 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
913 | (elfcpp::SHF_ALLOC | |
914 | | elfcpp::SHF_EXECINSTR), | |
1a2dff53 | 915 | this->plt_, false, false, false, false); |
2e30d253 | 916 | } |
c2b45e22 CC |
917 | } |
918 | ||
e291e7b9 ILT |
919 | // Return the section for TLSDESC relocations. |
920 | ||
921 | Target_x86_64::Reloc_section* | |
922 | Target_x86_64::rela_tlsdesc_section(Layout* layout) const | |
923 | { | |
924 | return this->plt_section()->rela_tlsdesc(layout); | |
925 | } | |
926 | ||
c2b45e22 CC |
927 | // Create a PLT entry for a global symbol. |
928 | ||
929 | void | |
930 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
931 | Symbol* gsym) | |
932 | { | |
933 | if (gsym->has_plt_offset()) | |
934 | return; | |
935 | ||
936 | if (this->plt_ == NULL) | |
937 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
938 | |
939 | this->plt_->add_entry(gsym); | |
940 | } | |
941 | ||
9fa33bee | 942 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
943 | |
944 | void | |
945 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
946 | { | |
947 | if (this->tls_base_symbol_defined_) | |
948 | return; | |
949 | ||
950 | Output_segment* tls_segment = layout->tls_segment(); | |
951 | if (tls_segment != NULL) | |
952 | { | |
183fd0e3 | 953 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 954 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 955 | Symbol_table::PREDEFINED, |
edfbb029 CC |
956 | tls_segment, 0, 0, |
957 | elfcpp::STT_TLS, | |
958 | elfcpp::STB_LOCAL, | |
959 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
960 | (is_exec |
961 | ? Symbol::SEGMENT_END | |
962 | : Symbol::SEGMENT_START), | |
963 | true); | |
edfbb029 CC |
964 | } |
965 | this->tls_base_symbol_defined_ = true; | |
966 | } | |
967 | ||
c2b45e22 CC |
968 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
969 | ||
970 | void | |
971 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
972 | Layout* layout) | |
973 | { | |
974 | if (this->plt_ == NULL) | |
975 | this->make_plt_section(symtab, layout); | |
976 | ||
977 | if (!this->plt_->has_tlsdesc_entry()) | |
978 | { | |
979 | // Allocate the TLSDESC_GOT entry. | |
980 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
981 | unsigned int got_offset = got->add_constant(0); | |
982 | ||
983 | // Allocate the TLSDESC_PLT entry. | |
984 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
985 | } | |
986 | } | |
987 | ||
31d60480 ILT |
988 | // Create a GOT entry for the TLS module index. |
989 | ||
990 | unsigned int | |
991 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
992 | Sized_relobj<64, false>* object) | |
993 | { | |
994 | if (this->got_mod_index_offset_ == -1U) | |
995 | { | |
996 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
997 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
998 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
999 | unsigned int got_offset = got->add_constant(0); | |
1000 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1001 | got_offset, 0); | |
009a67a2 | 1002 | got->add_constant(0); |
31d60480 ILT |
1003 | this->got_mod_index_offset_ = got_offset; |
1004 | } | |
1005 | return this->got_mod_index_offset_; | |
1006 | } | |
1007 | ||
2e30d253 ILT |
1008 | // Optimize the TLS relocation type based on what we know about the |
1009 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1010 | // known at link time. | |
1011 | ||
e041f13d | 1012 | tls::Tls_optimization |
2e30d253 ILT |
1013 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
1014 | { | |
2e30d253 ILT |
1015 | // If we are generating a shared library, then we can't do anything |
1016 | // in the linker. | |
8851ecca | 1017 | if (parameters->options().shared()) |
e041f13d | 1018 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1019 | |
1020 | switch (r_type) | |
1021 | { | |
1022 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1023 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1024 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1025 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1026 | // access. Since we know that we are generating an executable, |
1027 | // we can convert this to Initial-Exec. If we also know that | |
1028 | // this is a local symbol, we can further switch to Local-Exec. | |
1029 | if (is_final) | |
e041f13d ILT |
1030 | return tls::TLSOPT_TO_LE; |
1031 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1032 | |
d61c17ea | 1033 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1034 | // This is Local-Dynamic, which refers to a local symbol in the |
1035 | // dynamic TLS block. Since we know that we generating an | |
1036 | // executable, we can switch to Local-Exec. | |
e041f13d | 1037 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1038 | |
0ffd9845 | 1039 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1040 | case elfcpp::R_X86_64_DTPOFF64: |
1041 | // Another Local-Dynamic reloc. | |
e041f13d | 1042 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1043 | |
d61c17ea | 1044 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1045 | // These are Initial-Exec relocs which get the thread offset |
1046 | // from the GOT. If we know that we are linking against the | |
1047 | // local symbol, we can switch to Local-Exec, which links the | |
1048 | // thread offset into the instruction. | |
1049 | if (is_final) | |
e041f13d ILT |
1050 | return tls::TLSOPT_TO_LE; |
1051 | return tls::TLSOPT_NONE; | |
2e30d253 | 1052 | |
d61c17ea | 1053 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1054 | // When we already have Local-Exec, there is nothing further we |
1055 | // can do. | |
e041f13d | 1056 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1057 | |
1058 | default: | |
1059 | gold_unreachable(); | |
1060 | } | |
2e30d253 ILT |
1061 | } |
1062 | ||
e041f13d ILT |
1063 | // Report an unsupported relocation against a local symbol. |
1064 | ||
1065 | void | |
1066 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
1067 | unsigned int r_type) | |
1068 | { | |
75f2446e ILT |
1069 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1070 | object->name().c_str(), r_type); | |
e041f13d ILT |
1071 | } |
1072 | ||
a036edd8 ILT |
1073 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1074 | // dynamic linker does not support it, issue an error. The GNU linker | |
1075 | // only issues a non-PIC error for an allocated read-only section. | |
1076 | // Here we know the section is allocated, but we don't know that it is | |
1077 | // read-only. But we check for all the relocation types which the | |
1078 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
1079 | // error even if the section is not read-only. | |
1080 | ||
1081 | void | |
1082 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
1083 | { | |
1084 | switch (r_type) | |
1085 | { | |
1086 | // These are the relocation types supported by glibc for x86_64. | |
1087 | case elfcpp::R_X86_64_RELATIVE: | |
1088 | case elfcpp::R_X86_64_GLOB_DAT: | |
1089 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1090 | case elfcpp::R_X86_64_DTPMOD64: | |
1091 | case elfcpp::R_X86_64_DTPOFF64: | |
1092 | case elfcpp::R_X86_64_TPOFF64: | |
1093 | case elfcpp::R_X86_64_64: | |
1094 | case elfcpp::R_X86_64_32: | |
1095 | case elfcpp::R_X86_64_PC32: | |
1096 | case elfcpp::R_X86_64_COPY: | |
1097 | return; | |
1098 | ||
1099 | default: | |
1100 | // This prevents us from issuing more than one error per reloc | |
1101 | // section. But we can still wind up issuing more than one | |
1102 | // error per object file. | |
1103 | if (this->issued_non_pic_error_) | |
1104 | return; | |
33aea2fd | 1105 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
1106 | object->error(_("requires unsupported dynamic reloc; " |
1107 | "recompile with -fPIC")); | |
1108 | this->issued_non_pic_error_ = true; | |
1109 | return; | |
1110 | ||
1111 | case elfcpp::R_X86_64_NONE: | |
1112 | gold_unreachable(); | |
1113 | } | |
1114 | } | |
1115 | ||
2e30d253 ILT |
1116 | // Scan a relocation for a local symbol. |
1117 | ||
1118 | inline void | |
ad0f2072 | 1119 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1120 | Layout* layout, |
1121 | Target_x86_64* target, | |
1122 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1123 | unsigned int data_shndx, |
4f4c5f80 | 1124 | Output_section* output_section, |
0ffd9845 | 1125 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1126 | unsigned int r_type, |
7bf1f802 | 1127 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1128 | { |
1129 | switch (r_type) | |
1130 | { | |
1131 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1132 | case elfcpp::R_386_GNU_VTINHERIT: |
1133 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1134 | break; |
1135 | ||
1136 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1137 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1138 | // executable), we need to create a dynamic relocation for this |
1139 | // location. The relocation applied at link time will apply the | |
1140 | // link-time value, so we flag the location with an | |
1141 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1142 | // relocate it easily. |
8851ecca | 1143 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1144 | { |
e8c846c3 | 1145 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1146 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1147 | rela_dyn->add_local_relative(object, r_sym, |
1148 | elfcpp::R_X86_64_RELATIVE, | |
1149 | output_section, data_shndx, | |
1150 | reloc.get_r_offset(), | |
1151 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1152 | } |
1153 | break; | |
1154 | ||
2e30d253 ILT |
1155 | case elfcpp::R_X86_64_32: |
1156 | case elfcpp::R_X86_64_32S: | |
1157 | case elfcpp::R_X86_64_16: | |
1158 | case elfcpp::R_X86_64_8: | |
96f2030e | 1159 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1160 | // executable), we need to create a dynamic relocation for this |
1161 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1162 | // because that is always a 64-bit relocation. | |
8851ecca | 1163 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1164 | { |
a036edd8 ILT |
1165 | this->check_non_pic(object, r_type); |
1166 | ||
96f2030e | 1167 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1168 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1169 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1170 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1171 | data_shndx, reloc.get_r_offset(), | |
1172 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1173 | else |
1174 | { | |
1175 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1176 | unsigned int shndx = lsym.get_st_shndx(); |
1177 | bool is_ordinary; | |
1178 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1179 | &is_ordinary); | |
1180 | if (!is_ordinary) | |
1181 | object->error(_("section symbol %u has bad shndx %u"), | |
1182 | r_sym, shndx); | |
1183 | else | |
1184 | rela_dyn->add_local_section(object, shndx, | |
1185 | r_type, output_section, | |
1186 | data_shndx, reloc.get_r_offset(), | |
1187 | reloc.get_r_addend()); | |
dceae3c1 | 1188 | } |
96f2030e | 1189 | } |
2e30d253 ILT |
1190 | break; |
1191 | ||
1192 | case elfcpp::R_X86_64_PC64: | |
1193 | case elfcpp::R_X86_64_PC32: | |
1194 | case elfcpp::R_X86_64_PC16: | |
1195 | case elfcpp::R_X86_64_PC8: | |
1196 | break; | |
1197 | ||
f389a824 ILT |
1198 | case elfcpp::R_X86_64_PLT32: |
1199 | // Since we know this is a local symbol, we can handle this as a | |
1200 | // PC32 reloc. | |
1201 | break; | |
1202 | ||
fdc2f80f | 1203 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1204 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1205 | case elfcpp::R_X86_64_GOTPC64: |
1206 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1207 | // We need a GOT section. |
1208 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1209 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1210 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1211 | break; |
1212 | ||
0ffd9845 ILT |
1213 | case elfcpp::R_X86_64_GOT64: |
1214 | case elfcpp::R_X86_64_GOT32: | |
1215 | case elfcpp::R_X86_64_GOTPCREL64: | |
1216 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1217 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1218 | { |
1219 | // The symbol requires a GOT entry. | |
1220 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1221 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1222 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1223 | { |
1224 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1225 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1226 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1227 | { |
1228 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1229 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1230 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1231 | rela_dyn->add_local_relative( |
1232 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1233 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1234 | else |
dceae3c1 | 1235 | { |
a036edd8 ILT |
1236 | this->check_non_pic(object, r_type); |
1237 | ||
dceae3c1 | 1238 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1239 | rela_dyn->add_local( |
1240 | object, r_sym, r_type, got, | |
1241 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1242 | } |
0ffd9845 ILT |
1243 | } |
1244 | } | |
ee9e9e86 ILT |
1245 | // For GOTPLT64, we'd normally want a PLT section, but since |
1246 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1247 | } |
1248 | break; | |
1249 | ||
2e30d253 ILT |
1250 | case elfcpp::R_X86_64_COPY: |
1251 | case elfcpp::R_X86_64_GLOB_DAT: | |
1252 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1253 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1254 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1255 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1256 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1257 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1258 | gold_error(_("%s: unexpected reloc %u in object file"), |
1259 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1260 | break; |
1261 | ||
d61c17ea | 1262 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1263 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1264 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1265 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1266 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1267 | case elfcpp::R_X86_64_DTPOFF32: |
1268 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1269 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1270 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1271 | { |
8851ecca | 1272 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1273 | const tls::Tls_optimization optimized_type |
1274 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1275 | switch (r_type) |
1276 | { | |
56622147 | 1277 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1278 | if (optimized_type == tls::TLSOPT_NONE) |
1279 | { | |
1280 | // Create a pair of GOT entries for the module index and | |
1281 | // dtv-relative offset. | |
1282 | Output_data_got<64, false>* got | |
1283 | = target->got_section(symtab, layout); | |
1284 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1285 | unsigned int shndx = lsym.get_st_shndx(); |
1286 | bool is_ordinary; | |
1287 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1288 | if (!is_ordinary) | |
1289 | object->error(_("local symbol %u has bad shndx %u"), | |
1290 | r_sym, shndx); | |
1291 | else | |
1292 | got->add_local_pair_with_rela(object, r_sym, | |
1293 | shndx, | |
1294 | GOT_TYPE_TLS_PAIR, | |
1295 | target->rela_dyn_section(layout), | |
1296 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1297 | } |
1298 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1299 | unsupported_reloc_local(object, r_type); | |
1300 | break; | |
1301 | ||
56622147 | 1302 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1303 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1304 | if (optimized_type == tls::TLSOPT_NONE) |
1305 | { | |
1306 | // Create reserved PLT and GOT entries for the resolver. | |
1307 | target->reserve_tlsdesc_entries(symtab, layout); | |
1308 | ||
1309 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1310 | Output_data_got<64, false>* got | |
1311 | = target->got_section(symtab, layout); | |
1312 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
e291e7b9 ILT |
1313 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1314 | { | |
1315 | unsigned int got_offset = got->add_constant(0); | |
1316 | got->add_constant(0); | |
1317 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1318 | got_offset); | |
1319 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
1320 | // We store the arguments we need in a vector, and | |
1321 | // use the index into the vector as the parameter | |
1322 | // to pass to the target specific routines. | |
1323 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
1324 | void* arg = reinterpret_cast<void*>(intarg); | |
1325 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1326 | got, got_offset, 0); | |
1327 | } | |
c2b45e22 CC |
1328 | } |
1329 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1330 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1331 | break; |
1332 | ||
c2b45e22 CC |
1333 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1334 | break; | |
1335 | ||
e041f13d | 1336 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1337 | if (optimized_type == tls::TLSOPT_NONE) |
1338 | { | |
1339 | // Create a GOT entry for the module index. | |
31d60480 | 1340 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1341 | } |
1342 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1343 | unsupported_reloc_local(object, r_type); | |
1344 | break; | |
1345 | ||
0ffd9845 ILT |
1346 | case elfcpp::R_X86_64_DTPOFF32: |
1347 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1348 | break; |
1349 | ||
56622147 | 1350 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1351 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1352 | if (optimized_type == tls::TLSOPT_NONE) |
1353 | { | |
1354 | // Create a GOT entry for the tp-relative offset. | |
1355 | Output_data_got<64, false>* got | |
1356 | = target->got_section(symtab, layout); | |
1357 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1358 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1359 | target->rela_dyn_section(layout), |
1360 | elfcpp::R_X86_64_TPOFF64); | |
1361 | } | |
1362 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1363 | unsupported_reloc_local(object, r_type); |
1364 | break; | |
0ffd9845 | 1365 | |
56622147 | 1366 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1367 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1368 | if (output_is_shared) |
1369 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1370 | break; |
e041f13d ILT |
1371 | |
1372 | default: | |
1373 | gold_unreachable(); | |
2e30d253 ILT |
1374 | } |
1375 | } | |
1376 | break; | |
2e30d253 | 1377 | |
fdc2f80f ILT |
1378 | case elfcpp::R_X86_64_SIZE32: |
1379 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1380 | default: |
75f2446e ILT |
1381 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1382 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1383 | break; |
1384 | } | |
1385 | } | |
1386 | ||
1387 | ||
e041f13d ILT |
1388 | // Report an unsupported relocation against a global symbol. |
1389 | ||
1390 | void | |
1391 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1392 | unsigned int r_type, | |
1393 | Symbol* gsym) | |
1394 | { | |
75f2446e | 1395 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1396 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1397 | } |
1398 | ||
ce97fa81 | 1399 | // Returns true if this relocation type could be that of a function pointer. |
21bb3914 ST |
1400 | inline bool |
1401 | Target_x86_64::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1402 | { | |
21bb3914 ST |
1403 | switch (r_type) |
1404 | { | |
1405 | case elfcpp::R_X86_64_64: | |
1406 | case elfcpp::R_X86_64_32: | |
1407 | case elfcpp::R_X86_64_32S: | |
1408 | case elfcpp::R_X86_64_16: | |
1409 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
1410 | case elfcpp::R_X86_64_GOT64: |
1411 | case elfcpp::R_X86_64_GOT32: | |
1412 | case elfcpp::R_X86_64_GOTPCREL64: | |
1413 | case elfcpp::R_X86_64_GOTPCREL: | |
1414 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
1415 | { |
1416 | return true; | |
1417 | } | |
1418 | } | |
1419 | return false; | |
1420 | } | |
1421 | ||
1422 | // For safe ICF, scan a relocation for a local symbol to check if it | |
1423 | // corresponds to a function pointer being taken. In that case mark | |
1424 | // the function whose pointer was taken as not foldable. | |
1425 | ||
1426 | inline bool | |
1427 | Target_x86_64::Scan::local_reloc_may_be_function_pointer( | |
1428 | Symbol_table* , | |
1429 | Layout* , | |
1430 | Target_x86_64* , | |
1431 | Sized_relobj<64, false>* , | |
1432 | unsigned int , | |
1433 | Output_section* , | |
1434 | const elfcpp::Rela<64, false>& , | |
1435 | unsigned int r_type, | |
1436 | const elfcpp::Sym<64, false>&) | |
1437 | { | |
1438 | // When building a shared library, do not fold any local symbols as it is | |
1439 | // not possible to distinguish pointer taken versus a call by looking at | |
1440 | // the relocation types. | |
1441 | return (parameters->options().shared() | |
1442 | || possible_function_pointer_reloc(r_type)); | |
1443 | } | |
1444 | ||
1445 | // For safe ICF, scan a relocation for a global symbol to check if it | |
1446 | // corresponds to a function pointer being taken. In that case mark | |
1447 | // the function whose pointer was taken as not foldable. | |
1448 | ||
1449 | inline bool | |
1450 | Target_x86_64::Scan::global_reloc_may_be_function_pointer( | |
1451 | Symbol_table*, | |
1452 | Layout* , | |
1453 | Target_x86_64* , | |
1454 | Sized_relobj<64, false>* , | |
1455 | unsigned int , | |
1456 | Output_section* , | |
1457 | const elfcpp::Rela<64, false>& , | |
1458 | unsigned int r_type, | |
1459 | Symbol* gsym) | |
1460 | { | |
1461 | // When building a shared library, do not fold symbols whose visibility | |
1462 | // is hidden, internal or protected. | |
1463 | return ((parameters->options().shared() | |
1464 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
1465 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
1466 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
1467 | || possible_function_pointer_reloc(r_type)); | |
1468 | } | |
1469 | ||
2e30d253 ILT |
1470 | // Scan a relocation for a global symbol. |
1471 | ||
1472 | inline void | |
ad0f2072 | 1473 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1474 | Layout* layout, |
1475 | Target_x86_64* target, | |
1476 | Sized_relobj<64, false>* object, | |
1477 | unsigned int data_shndx, | |
4f4c5f80 | 1478 | Output_section* output_section, |
d61c17ea ILT |
1479 | const elfcpp::Rela<64, false>& reloc, |
1480 | unsigned int r_type, | |
1481 | Symbol* gsym) | |
2e30d253 ILT |
1482 | { |
1483 | switch (r_type) | |
1484 | { | |
1485 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1486 | case elfcpp::R_386_GNU_VTINHERIT: |
1487 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1488 | break; |
1489 | ||
1490 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1491 | case elfcpp::R_X86_64_32: |
1492 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1493 | case elfcpp::R_X86_64_16: |
2e30d253 | 1494 | case elfcpp::R_X86_64_8: |
96f2030e | 1495 | { |
d61c6bd4 ILT |
1496 | // Make a PLT entry if necessary. |
1497 | if (gsym->needs_plt_entry()) | |
1498 | { | |
1499 | target->make_plt_entry(symtab, layout, gsym); | |
1500 | // Since this is not a PC-relative relocation, we may be | |
1501 | // taking the address of a function. In that case we need to | |
1502 | // set the entry in the dynamic symbol table to the address of | |
1503 | // the PLT entry. | |
8851ecca | 1504 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1505 | gsym->set_needs_dynsym_value(); |
1506 | } | |
1507 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1508 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1509 | { |
966d4097 | 1510 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1511 | { |
12c0daef | 1512 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1513 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1514 | } |
1515 | else if (r_type == elfcpp::R_X86_64_64 | |
1516 | && gsym->can_use_relative_reloc(false)) | |
1517 | { | |
1518 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1519 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1520 | output_section, object, | |
1521 | data_shndx, reloc.get_r_offset(), | |
1522 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1523 | } |
1524 | else | |
1525 | { | |
a036edd8 | 1526 | this->check_non_pic(object, r_type); |
96f2030e | 1527 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1528 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1529 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1530 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1531 | } |
1532 | } | |
1533 | } | |
1534 | break; | |
1535 | ||
1536 | case elfcpp::R_X86_64_PC64: | |
1537 | case elfcpp::R_X86_64_PC32: | |
1538 | case elfcpp::R_X86_64_PC16: | |
1539 | case elfcpp::R_X86_64_PC8: | |
1540 | { | |
1541 | // Make a PLT entry if necessary. | |
1542 | if (gsym->needs_plt_entry()) | |
1543 | target->make_plt_entry(symtab, layout, gsym); | |
1544 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1545 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1546 | if (gsym->is_func()) |
0700cf32 ILT |
1547 | flags |= Symbol::FUNCTION_CALL; |
1548 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1549 | { |
966d4097 | 1550 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1551 | { |
12c0daef | 1552 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1553 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1554 | } |
86849f1f | 1555 | else |
d61c6bd4 | 1556 | { |
a036edd8 | 1557 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1558 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1559 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1560 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1561 | reloc.get_r_addend()); |
1562 | } | |
86849f1f | 1563 | } |
d61c6bd4 | 1564 | } |
2e30d253 ILT |
1565 | break; |
1566 | ||
ff006520 | 1567 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1568 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1569 | case elfcpp::R_X86_64_GOTPCREL64: |
1570 | case elfcpp::R_X86_64_GOTPCREL: | |
1571 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1572 | { |
1573 | // The symbol requires a GOT entry. | |
1574 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1575 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1576 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1577 | else |
1578 | { | |
2e30d253 ILT |
1579 | // If this symbol is not fully resolved, we need to add a |
1580 | // dynamic relocation for it. | |
7bf1f802 | 1581 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1582 | if (gsym->is_from_dynobj() |
1583 | || gsym->is_undefined() | |
1584 | || gsym->is_preemptible()) | |
0a65a3a7 | 1585 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1586 | elfcpp::R_X86_64_GLOB_DAT); |
1587 | else | |
2e30d253 | 1588 | { |
0a65a3a7 CC |
1589 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1590 | rela_dyn->add_global_relative( | |
1591 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1592 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1593 | } |
1594 | } | |
ee9e9e86 ILT |
1595 | // For GOTPLT64, we also need a PLT entry (but only if the |
1596 | // symbol is not fully resolved). | |
1597 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1598 | && !gsym->final_value_is_known()) | |
1599 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1600 | } |
1601 | break; | |
1602 | ||
1603 | case elfcpp::R_X86_64_PLT32: | |
1604 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1605 | // Otherwise we need a PLT entry. | |
1606 | if (gsym->final_value_is_known()) | |
1607 | break; | |
96f2030e ILT |
1608 | // If building a shared library, we can also skip the PLT entry |
1609 | // if the symbol is defined in the output file and is protected | |
1610 | // or hidden. | |
1611 | if (gsym->is_defined() | |
1612 | && !gsym->is_from_dynobj() | |
1613 | && !gsym->is_preemptible()) | |
1614 | break; | |
2e30d253 ILT |
1615 | target->make_plt_entry(symtab, layout, gsym); |
1616 | break; | |
1617 | ||
fdc2f80f | 1618 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1619 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1620 | case elfcpp::R_X86_64_GOTPC64: |
1621 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1622 | // We need a GOT section. |
1623 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1624 | // For PLTOFF64, we also need a PLT entry (but only if the |
1625 | // symbol is not fully resolved). | |
1626 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1627 | && !gsym->final_value_is_known()) | |
1628 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1629 | break; |
1630 | ||
2e30d253 ILT |
1631 | case elfcpp::R_X86_64_COPY: |
1632 | case elfcpp::R_X86_64_GLOB_DAT: | |
1633 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1634 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1635 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1636 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1637 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1638 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1639 | gold_error(_("%s: unexpected reloc %u in object file"), |
1640 | object->name().c_str(), r_type); | |
2e30d253 | 1641 | break; |
2e30d253 | 1642 | |
d61c17ea | 1643 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1644 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1645 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1646 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1647 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1648 | case elfcpp::R_X86_64_DTPOFF32: |
1649 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1650 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1651 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1652 | { |
1653 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1654 | const tls::Tls_optimization optimized_type |
1655 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1656 | switch (r_type) |
1657 | { | |
56622147 | 1658 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1659 | if (optimized_type == tls::TLSOPT_NONE) |
1660 | { | |
1661 | // Create a pair of GOT entries for the module index and | |
1662 | // dtv-relative offset. | |
1663 | Output_data_got<64, false>* got | |
1664 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1665 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1666 | target->rela_dyn_section(layout), | |
1667 | elfcpp::R_X86_64_DTPMOD64, | |
1668 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1669 | } |
1670 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1671 | { | |
1672 | // Create a GOT entry for the tp-relative offset. | |
1673 | Output_data_got<64, false>* got | |
1674 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1675 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1676 | target->rela_dyn_section(layout), |
1677 | elfcpp::R_X86_64_TPOFF64); | |
1678 | } | |
1679 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1680 | unsupported_reloc_global(object, r_type, gsym); | |
1681 | break; | |
1682 | ||
56622147 | 1683 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1684 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1685 | if (optimized_type == tls::TLSOPT_NONE) |
1686 | { | |
1687 | // Create reserved PLT and GOT entries for the resolver. | |
1688 | target->reserve_tlsdesc_entries(symtab, layout); | |
1689 | ||
1690 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1691 | Output_data_got<64, false>* got | |
1692 | = target->got_section(symtab, layout); | |
e291e7b9 ILT |
1693 | Reloc_section *rt = target->rela_tlsdesc_section(layout); |
1694 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1695 | elfcpp::R_X86_64_TLSDESC, 0); |
1696 | } | |
1697 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1698 | { | |
1699 | // Create a GOT entry for the tp-relative offset. | |
1700 | Output_data_got<64, false>* got | |
1701 | = target->got_section(symtab, layout); | |
1702 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1703 | target->rela_dyn_section(layout), | |
1704 | elfcpp::R_X86_64_TPOFF64); | |
1705 | } | |
1706 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1707 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1708 | break; |
1709 | ||
c2b45e22 CC |
1710 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1711 | break; | |
1712 | ||
e041f13d | 1713 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1714 | if (optimized_type == tls::TLSOPT_NONE) |
1715 | { | |
1716 | // Create a GOT entry for the module index. | |
31d60480 | 1717 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1718 | } |
1719 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1720 | unsupported_reloc_global(object, r_type, gsym); | |
1721 | break; | |
1722 | ||
0ffd9845 ILT |
1723 | case elfcpp::R_X86_64_DTPOFF32: |
1724 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1725 | break; |
1726 | ||
56622147 | 1727 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1728 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1729 | if (optimized_type == tls::TLSOPT_NONE) |
1730 | { | |
1731 | // Create a GOT entry for the tp-relative offset. | |
1732 | Output_data_got<64, false>* got | |
1733 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1734 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1735 | target->rela_dyn_section(layout), |
1736 | elfcpp::R_X86_64_TPOFF64); | |
1737 | } | |
1738 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1739 | unsupported_reloc_global(object, r_type, gsym); |
1740 | break; | |
0ffd9845 | 1741 | |
56622147 | 1742 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1743 | layout->set_has_static_tls(); |
8851ecca | 1744 | if (parameters->options().shared()) |
7bf1f802 | 1745 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1746 | break; |
e041f13d ILT |
1747 | |
1748 | default: | |
1749 | gold_unreachable(); | |
2e30d253 ILT |
1750 | } |
1751 | } | |
1752 | break; | |
fdc2f80f ILT |
1753 | |
1754 | case elfcpp::R_X86_64_SIZE32: | |
1755 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1756 | default: |
75f2446e | 1757 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1758 | object->name().c_str(), r_type, |
1759 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1760 | break; |
1761 | } | |
1762 | } | |
1763 | ||
6d03d481 | 1764 | void |
ad0f2072 | 1765 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1766 | Layout* layout, |
1767 | Sized_relobj<64, false>* object, | |
1768 | unsigned int data_shndx, | |
1769 | unsigned int sh_type, | |
1770 | const unsigned char* prelocs, | |
1771 | size_t reloc_count, | |
1772 | Output_section* output_section, | |
1773 | bool needs_special_offset_handling, | |
1774 | size_t local_symbol_count, | |
1775 | const unsigned char* plocal_symbols) | |
1776 | { | |
1777 | ||
1778 | if (sh_type == elfcpp::SHT_REL) | |
1779 | { | |
1780 | return; | |
1781 | } | |
1782 | ||
1783 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1784 | Target_x86_64::Scan>( | |
6d03d481 ST |
1785 | symtab, |
1786 | layout, | |
1787 | this, | |
1788 | object, | |
1789 | data_shndx, | |
1790 | prelocs, | |
1791 | reloc_count, | |
1792 | output_section, | |
1793 | needs_special_offset_handling, | |
1794 | local_symbol_count, | |
1795 | plocal_symbols); | |
1796 | ||
1797 | } | |
2e30d253 ILT |
1798 | // Scan relocations for a section. |
1799 | ||
1800 | void | |
ad0f2072 | 1801 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
1802 | Layout* layout, |
1803 | Sized_relobj<64, false>* object, | |
1804 | unsigned int data_shndx, | |
1805 | unsigned int sh_type, | |
1806 | const unsigned char* prelocs, | |
1807 | size_t reloc_count, | |
730cdc88 ILT |
1808 | Output_section* output_section, |
1809 | bool needs_special_offset_handling, | |
d61c17ea | 1810 | size_t local_symbol_count, |
730cdc88 | 1811 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1812 | { |
1813 | if (sh_type == elfcpp::SHT_REL) | |
1814 | { | |
75f2446e ILT |
1815 | gold_error(_("%s: unsupported REL reloc section"), |
1816 | object->name().c_str()); | |
1817 | return; | |
2e30d253 ILT |
1818 | } |
1819 | ||
1820 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1821 | Target_x86_64::Scan>( | |
2e30d253 ILT |
1822 | symtab, |
1823 | layout, | |
1824 | this, | |
1825 | object, | |
1826 | data_shndx, | |
1827 | prelocs, | |
1828 | reloc_count, | |
730cdc88 ILT |
1829 | output_section, |
1830 | needs_special_offset_handling, | |
2e30d253 | 1831 | local_symbol_count, |
730cdc88 | 1832 | plocal_symbols); |
2e30d253 ILT |
1833 | } |
1834 | ||
1835 | // Finalize the sections. | |
1836 | ||
1837 | void | |
f59f41f3 DK |
1838 | Target_x86_64::do_finalize_sections( |
1839 | Layout* layout, | |
1840 | const Input_objects*, | |
e785ec03 | 1841 | Symbol_table* symtab) |
2e30d253 | 1842 | { |
ea715a34 ILT |
1843 | const Reloc_section* rel_plt = (this->plt_ == NULL |
1844 | ? NULL | |
e291e7b9 | 1845 | : this->plt_->rela_plt()); |
ea715a34 | 1846 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 1847 | this->rela_dyn_, true, false); |
ea715a34 | 1848 | |
2e30d253 ILT |
1849 | // Fill in some more dynamic tags. |
1850 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1851 | if (odyn != NULL) | |
1852 | { | |
22b127cc | 1853 | if (this->plt_ != NULL |
ea715a34 ILT |
1854 | && this->plt_->output_section() != NULL |
1855 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 1856 | { |
ea715a34 ILT |
1857 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
1858 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1859 | this->got_->finalize_data_size(); | |
1860 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1861 | this->plt_, plt_offset); | |
1862 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1863 | this->got_, got_offset); | |
2e30d253 ILT |
1864 | } |
1865 | } | |
1866 | ||
1867 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1868 | // relocs. | |
12c0daef ILT |
1869 | if (this->copy_relocs_.any_saved_relocs()) |
1870 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
1871 | |
1872 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
1873 | // the .got.plt section. | |
1874 | Symbol* sym = this->global_offset_table_; | |
1875 | if (sym != NULL) | |
1876 | { | |
1877 | uint64_t data_size = this->got_plt_->current_data_size(); | |
1878 | symtab->get_sized_symbol<64>(sym)->set_symsize(data_size); | |
1879 | } | |
2e30d253 ILT |
1880 | } |
1881 | ||
1882 | // Perform a relocation. | |
1883 | ||
1884 | inline bool | |
1885 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1886 | Target_x86_64* target, | |
031cdbed | 1887 | Output_section*, |
2e30d253 | 1888 | size_t relnum, |
0ffd9845 | 1889 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1890 | unsigned int r_type, |
1891 | const Sized_symbol<64>* gsym, | |
1892 | const Symbol_value<64>* psymval, | |
1893 | unsigned char* view, | |
1894 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1895 | section_size_type view_size) |
2e30d253 ILT |
1896 | { |
1897 | if (this->skip_call_tls_get_addr_) | |
1898 | { | |
5efc7cd2 CC |
1899 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1900 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1901 | || gsym == NULL |
0ffd9845 | 1902 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1903 | { |
75f2446e ILT |
1904 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1905 | _("missing expected TLS relocation")); | |
1906 | } | |
1907 | else | |
1908 | { | |
1909 | this->skip_call_tls_get_addr_ = false; | |
1910 | return false; | |
2e30d253 | 1911 | } |
2e30d253 ILT |
1912 | } |
1913 | ||
1914 | // Pick the value to use for symbols defined in shared objects. | |
1915 | Symbol_value<64> symval; | |
96f2030e | 1916 | if (gsym != NULL |
de4c45bd ILT |
1917 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1918 | || r_type == elfcpp::R_X86_64_PC32 | |
1919 | || r_type == elfcpp::R_X86_64_PC16 | |
1920 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1921 | { |
1922 | symval.set_output_value(target->plt_section()->address() | |
1923 | + gsym->plt_offset()); | |
1924 | psymval = &symval; | |
1925 | } | |
1926 | ||
1927 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1928 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1929 | ||
1930 | // Get the GOT offset if needed. | |
96f2030e ILT |
1931 | // The GOT pointer points to the end of the GOT section. |
1932 | // We need to subtract the size of the GOT section to get | |
1933 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1934 | bool have_got_offset = false; |
1935 | unsigned int got_offset = 0; | |
1936 | switch (r_type) | |
1937 | { | |
1938 | case elfcpp::R_X86_64_GOT32: | |
1939 | case elfcpp::R_X86_64_GOT64: | |
1940 | case elfcpp::R_X86_64_GOTPLT64: | |
1941 | case elfcpp::R_X86_64_GOTPCREL: | |
1942 | case elfcpp::R_X86_64_GOTPCREL64: | |
1943 | if (gsym != NULL) | |
1944 | { | |
0a65a3a7 CC |
1945 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1946 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1947 | } |
1948 | else | |
1949 | { | |
1950 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1951 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1952 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1953 | - target->got_size()); | |
0ffd9845 ILT |
1954 | } |
1955 | have_got_offset = true; | |
1956 | break; | |
1957 | ||
1958 | default: | |
1959 | break; | |
1960 | } | |
2e30d253 ILT |
1961 | |
1962 | switch (r_type) | |
1963 | { | |
1964 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1965 | case elfcpp::R_386_GNU_VTINHERIT: |
1966 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1967 | break; |
1968 | ||
1969 | case elfcpp::R_X86_64_64: | |
1970 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1971 | break; | |
1972 | ||
1973 | case elfcpp::R_X86_64_PC64: | |
1974 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1975 | address); | |
1976 | break; | |
1977 | ||
1978 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1979 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1980 | // uint64_t x = value + addend; | |
1981 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1982 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1983 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1984 | break; | |
1985 | ||
1986 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1987 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1988 | // int64_t x = value + addend; // note this quantity is signed! | |
1989 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1990 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1991 | break; | |
1992 | ||
1993 | case elfcpp::R_X86_64_PC32: | |
1994 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1995 | address); | |
1996 | break; | |
1997 | ||
1998 | case elfcpp::R_X86_64_16: | |
1999 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
2000 | break; | |
2001 | ||
2002 | case elfcpp::R_X86_64_PC16: | |
2003 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
2004 | address); | |
2005 | break; | |
2006 | ||
2007 | case elfcpp::R_X86_64_8: | |
2008 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
2009 | break; | |
2010 | ||
2011 | case elfcpp::R_X86_64_PC8: | |
2012 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
2013 | address); | |
2014 | break; | |
2015 | ||
2016 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
2017 | gold_assert(gsym == NULL |
2018 | || gsym->has_plt_offset() | |
99f8faca ILT |
2019 | || gsym->final_value_is_known() |
2020 | || (gsym->is_defined() | |
2021 | && !gsym->is_from_dynobj() | |
2022 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
2023 | // Note: while this code looks the same as for R_X86_64_PC32, it |
2024 | // behaves differently because psymval was set to point to | |
2025 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
2026 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
2027 | address); | |
2028 | break; | |
2029 | ||
ee9e9e86 ILT |
2030 | case elfcpp::R_X86_64_PLTOFF64: |
2031 | { | |
2032 | gold_assert(gsym); | |
2033 | gold_assert(gsym->has_plt_offset() | |
2034 | || gsym->final_value_is_known()); | |
2035 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
2036 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
2037 | Relocate_functions<64, false>::rela64(view, object, psymval, |
2038 | addend - got_address); | |
ee9e9e86 ILT |
2039 | } |
2040 | ||
2e30d253 | 2041 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
2042 | gold_assert(have_got_offset); |
2043 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
2044 | break; |
2045 | ||
e822f2b1 ILT |
2046 | case elfcpp::R_X86_64_GOTPC32: |
2047 | { | |
2048 | gold_assert(gsym); | |
2049 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2050 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2051 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2052 | } | |
2053 | break; | |
2054 | ||
2055 | case elfcpp::R_X86_64_GOT64: | |
2056 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
2057 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 2058 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2059 | gold_assert(have_got_offset); |
2060 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
2061 | break; |
2062 | ||
2063 | case elfcpp::R_X86_64_GOTPC64: | |
2064 | { | |
2065 | gold_assert(gsym); | |
2066 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2067 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2068 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
2069 | } | |
2070 | break; | |
2071 | ||
2e30d253 ILT |
2072 | case elfcpp::R_X86_64_GOTOFF64: |
2073 | { | |
2074 | elfcpp::Elf_types<64>::Elf_Addr value; | |
2075 | value = (psymval->value(object, 0) | |
96f2030e | 2076 | - target->got_plt_section()->address()); |
2e30d253 ILT |
2077 | Relocate_functions<64, false>::rela64(view, value, addend); |
2078 | } | |
2079 | break; | |
2080 | ||
2081 | case elfcpp::R_X86_64_GOTPCREL: | |
2082 | { | |
0ffd9845 ILT |
2083 | gold_assert(have_got_offset); |
2084 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2085 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2086 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
2087 | } |
2088 | break; | |
2089 | ||
e822f2b1 ILT |
2090 | case elfcpp::R_X86_64_GOTPCREL64: |
2091 | { | |
0ffd9845 ILT |
2092 | gold_assert(have_got_offset); |
2093 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2094 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2095 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
2096 | } |
2097 | break; | |
2098 | ||
2e30d253 ILT |
2099 | case elfcpp::R_X86_64_COPY: |
2100 | case elfcpp::R_X86_64_GLOB_DAT: | |
2101 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2102 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 2103 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2104 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2105 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2106 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2107 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2108 | _("unexpected reloc %u in object file"), | |
2109 | r_type); | |
2e30d253 ILT |
2110 | break; |
2111 | ||
d61c17ea | 2112 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2113 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2114 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2115 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2116 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2117 | case elfcpp::R_X86_64_DTPOFF32: |
2118 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2119 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2120 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
2121 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2122 | view, address, view_size); | |
2e30d253 | 2123 | break; |
2e30d253 | 2124 | |
fdc2f80f ILT |
2125 | case elfcpp::R_X86_64_SIZE32: |
2126 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2127 | default: |
75f2446e ILT |
2128 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2129 | _("unsupported reloc %u"), | |
2130 | r_type); | |
2e30d253 ILT |
2131 | break; |
2132 | } | |
2133 | ||
2134 | return true; | |
2135 | } | |
2136 | ||
2137 | // Perform a TLS relocation. | |
2138 | ||
2139 | inline void | |
d61c17ea | 2140 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 2141 | Target_x86_64* target, |
d61c17ea | 2142 | size_t relnum, |
72ec2876 | 2143 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2144 | unsigned int r_type, |
2145 | const Sized_symbol<64>* gsym, | |
2146 | const Symbol_value<64>* psymval, | |
2147 | unsigned char* view, | |
6a41d30b | 2148 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2149 | section_size_type view_size) |
2e30d253 | 2150 | { |
2e30d253 | 2151 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
2152 | |
2153 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 2154 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
2155 | |
2156 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
2157 | ||
2158 | const bool is_final = (gsym == NULL | |
b3705d2a | 2159 | ? !parameters->options().shared() |
2e30d253 | 2160 | : gsym->final_value_is_known()); |
e041f13d ILT |
2161 | const tls::Tls_optimization optimized_type |
2162 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
2163 | switch (r_type) |
2164 | { | |
56622147 | 2165 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 2166 | this->saw_tls_block_reloc_ = true; |
e041f13d | 2167 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 2168 | { |
7bf1f802 | 2169 | gold_assert(tls_segment != NULL); |
2e30d253 | 2170 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 2171 | rela, r_type, value, view, |
2e30d253 ILT |
2172 | view_size); |
2173 | break; | |
2174 | } | |
7bf1f802 ILT |
2175 | else |
2176 | { | |
c2b45e22 CC |
2177 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2178 | ? GOT_TYPE_TLS_OFFSET | |
2179 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2180 | unsigned int got_offset; |
2181 | if (gsym != NULL) | |
2182 | { | |
c2b45e22 CC |
2183 | gold_assert(gsym->has_got_offset(got_type)); |
2184 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2185 | } |
2186 | else | |
2187 | { | |
2188 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2189 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2190 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2191 | - target->got_size()); |
2192 | } | |
2193 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2194 | { | |
2195 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2196 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2197 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2198 | value, view, address, view_size); |
7bf1f802 ILT |
2199 | break; |
2200 | } | |
2201 | else if (optimized_type == tls::TLSOPT_NONE) | |
2202 | { | |
2203 | // Relocate the field with the offset of the pair of GOT | |
2204 | // entries. | |
6a41d30b ILT |
2205 | value = target->got_plt_section()->address() + got_offset; |
2206 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2207 | address); | |
7bf1f802 ILT |
2208 | break; |
2209 | } | |
2210 | } | |
72ec2876 | 2211 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2212 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2213 | break; |
2214 | ||
c2b45e22 CC |
2215 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2216 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2217 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2218 | if (optimized_type == tls::TLSOPT_TO_LE) |
2219 | { | |
2220 | gold_assert(tls_segment != NULL); | |
2221 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2222 | rela, r_type, value, view, | |
2223 | view_size); | |
2224 | break; | |
2225 | } | |
2226 | else | |
2227 | { | |
2228 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2229 | ? GOT_TYPE_TLS_OFFSET | |
2230 | : GOT_TYPE_TLS_DESC); | |
2231 | unsigned int got_offset; | |
2232 | if (gsym != NULL) | |
2233 | { | |
2234 | gold_assert(gsym->has_got_offset(got_type)); | |
2235 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2236 | } | |
2237 | else | |
2238 | { | |
2239 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2240 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2241 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2242 | - target->got_size()); | |
2243 | } | |
2244 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2245 | { | |
2246 | gold_assert(tls_segment != NULL); | |
2247 | value = target->got_plt_section()->address() + got_offset; | |
2248 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2249 | rela, r_type, value, view, address, | |
2250 | view_size); | |
2251 | break; | |
2252 | } | |
2253 | else if (optimized_type == tls::TLSOPT_NONE) | |
2254 | { | |
2255 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2256 | { | |
2257 | // Relocate the field with the offset of the pair of GOT | |
2258 | // entries. | |
2259 | value = target->got_plt_section()->address() + got_offset; | |
2260 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2261 | address); | |
2262 | } | |
2263 | break; | |
2264 | } | |
2265 | } | |
2266 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2267 | _("unsupported reloc %u"), r_type); | |
2268 | break; | |
2269 | ||
56622147 | 2270 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2271 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2272 | if (optimized_type == tls::TLSOPT_TO_LE) |
2273 | { | |
7bf1f802 | 2274 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2275 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2276 | value, view, view_size); | |
2277 | break; | |
e041f13d | 2278 | } |
7bf1f802 ILT |
2279 | else if (optimized_type == tls::TLSOPT_NONE) |
2280 | { | |
2281 | // Relocate the field with the offset of the GOT entry for | |
2282 | // the module index. | |
2283 | unsigned int got_offset; | |
31d60480 ILT |
2284 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2285 | - target->got_size()); | |
6a41d30b ILT |
2286 | value = target->got_plt_section()->address() + got_offset; |
2287 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2288 | address); | |
7bf1f802 ILT |
2289 | break; |
2290 | } | |
72ec2876 | 2291 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2292 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2293 | break; |
0ffd9845 ILT |
2294 | |
2295 | case elfcpp::R_X86_64_DTPOFF32: | |
e041f13d | 2296 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2297 | { |
2298 | // This relocation type is used in debugging information. | |
2299 | // In that case we need to not optimize the value. If we | |
2300 | // haven't seen a TLSLD reloc, then we assume we should not | |
2301 | // optimize this reloc. | |
2302 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2303 | { |
2304 | gold_assert(tls_segment != NULL); | |
2305 | value -= tls_segment->memsz(); | |
2306 | } | |
497897f9 | 2307 | } |
d85c80a3 | 2308 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2309 | break; |
2310 | ||
2311 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d | 2312 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2313 | { |
2314 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2315 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2316 | { |
2317 | gold_assert(tls_segment != NULL); | |
2318 | value -= tls_segment->memsz(); | |
2319 | } | |
497897f9 | 2320 | } |
d85c80a3 | 2321 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2322 | break; |
2e30d253 | 2323 | |
56622147 ILT |
2324 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2325 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2326 | { | |
7bf1f802 | 2327 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2328 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2329 | rela, r_type, value, view, | |
2330 | view_size); | |
2331 | break; | |
2332 | } | |
7bf1f802 ILT |
2333 | else if (optimized_type == tls::TLSOPT_NONE) |
2334 | { | |
2335 | // Relocate the field with the offset of the GOT entry for | |
2336 | // the tp-relative offset of the symbol. | |
2337 | unsigned int got_offset; | |
2338 | if (gsym != NULL) | |
2339 | { | |
0a65a3a7 CC |
2340 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2341 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2342 | - target->got_size()); | |
7bf1f802 ILT |
2343 | } |
2344 | else | |
2345 | { | |
2346 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2347 | gold_assert(object->local_has_got_offset(r_sym, |
2348 | GOT_TYPE_TLS_OFFSET)); | |
2349 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2350 | - target->got_size()); |
2351 | } | |
6a41d30b ILT |
2352 | value = target->got_plt_section()->address() + got_offset; |
2353 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2354 | break; |
2355 | } | |
56622147 ILT |
2356 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2357 | _("unsupported reloc type %u"), | |
2358 | r_type); | |
2359 | break; | |
0ffd9845 | 2360 | |
56622147 | 2361 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2362 | value -= tls_segment->memsz(); |
d85c80a3 | 2363 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2364 | break; |
2e30d253 | 2365 | } |
2e30d253 ILT |
2366 | } |
2367 | ||
7bf1f802 ILT |
2368 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2369 | // Initial-Exec. | |
2370 | ||
2371 | inline void | |
2372 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2373 | size_t relnum, | |
c2b45e22 | 2374 | Output_segment*, |
7bf1f802 ILT |
2375 | const elfcpp::Rela<64, false>& rela, |
2376 | unsigned int, | |
2377 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2378 | unsigned char* view, | |
c2b45e22 | 2379 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2380 | section_size_type view_size) |
7bf1f802 ILT |
2381 | { |
2382 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2383 | // .word 0x6666; rex64; call __tls_get_addr | |
2384 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2385 | ||
2386 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2387 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2388 | ||
2389 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2390 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2391 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2392 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2393 | ||
2394 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2395 | ||
c2b45e22 CC |
2396 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2397 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2398 | |
2399 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2400 | // We can skip it. | |
2401 | this->skip_call_tls_get_addr_ = true; | |
2402 | } | |
2403 | ||
e041f13d | 2404 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2405 | // Local-Exec. |
2406 | ||
2407 | inline void | |
d61c17ea ILT |
2408 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2409 | size_t relnum, | |
2410 | Output_segment* tls_segment, | |
72ec2876 | 2411 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2412 | unsigned int, |
2413 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2414 | unsigned char* view, | |
fe8718a4 | 2415 | section_size_type view_size) |
2e30d253 | 2416 | { |
0ffd9845 ILT |
2417 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2418 | // .word 0x6666; rex64; call __tls_get_addr | |
2419 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2420 | |
72ec2876 ILT |
2421 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2422 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2423 | |
72ec2876 ILT |
2424 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2425 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2426 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2427 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2428 | |
0ffd9845 | 2429 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2430 | |
6a41d30b | 2431 | value -= tls_segment->memsz(); |
0ffd9845 | 2432 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2433 | |
2434 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2435 | // We can skip it. | |
2436 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2437 | } |
2438 | ||
c2b45e22 CC |
2439 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2440 | ||
2441 | inline void | |
2442 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2443 | const Relocate_info<64, false>* relinfo, | |
2444 | size_t relnum, | |
2445 | Output_segment*, | |
2446 | const elfcpp::Rela<64, false>& rela, | |
2447 | unsigned int r_type, | |
2448 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2449 | unsigned char* view, | |
2450 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2451 | section_size_type view_size) | |
2452 | { | |
2453 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2454 | { | |
2455 | // leaq foo@tlsdesc(%rip), %rax | |
2456 | // ==> movq foo@gottpoff(%rip), %rax | |
2457 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2458 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2459 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2460 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2461 | view[-2] = 0x8b; | |
2462 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2463 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2464 | } | |
2465 | else | |
2466 | { | |
2467 | // call *foo@tlscall(%rax) | |
2468 | // ==> nop; nop | |
2469 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2470 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2471 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2472 | view[0] == 0xff && view[1] == 0x10); | |
2473 | view[0] = 0x66; | |
2474 | view[1] = 0x90; | |
2475 | } | |
2476 | } | |
2477 | ||
2478 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2479 | ||
2480 | inline void | |
2481 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2482 | const Relocate_info<64, false>* relinfo, | |
2483 | size_t relnum, | |
2484 | Output_segment* tls_segment, | |
2485 | const elfcpp::Rela<64, false>& rela, | |
2486 | unsigned int r_type, | |
2487 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2488 | unsigned char* view, | |
2489 | section_size_type view_size) | |
2490 | { | |
2491 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2492 | { | |
2493 | // leaq foo@tlsdesc(%rip), %rax | |
2494 | // ==> movq foo@tpoff, %rax | |
2495 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2496 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2497 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2498 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2499 | view[-2] = 0xc7; | |
2500 | view[-1] = 0xc0; | |
2501 | value -= tls_segment->memsz(); | |
2502 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2503 | } | |
2504 | else | |
2505 | { | |
2506 | // call *foo@tlscall(%rax) | |
2507 | // ==> nop; nop | |
2508 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2509 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2510 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2511 | view[0] == 0xff && view[1] == 0x10); | |
2512 | view[0] = 0x66; | |
2513 | view[1] = 0x90; | |
2514 | } | |
2515 | } | |
2516 | ||
2e30d253 | 2517 | inline void |
72ec2876 ILT |
2518 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2519 | size_t relnum, | |
2520 | Output_segment*, | |
2521 | const elfcpp::Rela<64, false>& rela, | |
2522 | unsigned int, | |
2523 | elfcpp::Elf_types<64>::Elf_Addr, | |
2524 | unsigned char* view, | |
fe8718a4 | 2525 | section_size_type view_size) |
2e30d253 | 2526 | { |
72ec2876 ILT |
2527 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2528 | // ... leq foo@dtpoff(%rax),%reg | |
2529 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2530 | |
72ec2876 ILT |
2531 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2532 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2533 | |
72ec2876 ILT |
2534 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2535 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2536 | ||
2537 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2538 | ||
2539 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2540 | ||
2541 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2542 | // We can skip it. | |
2543 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2544 | } |
2545 | ||
56622147 ILT |
2546 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2547 | // Local-Exec. | |
2548 | ||
2549 | inline void | |
2550 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2551 | size_t relnum, | |
2552 | Output_segment* tls_segment, | |
2553 | const elfcpp::Rela<64, false>& rela, | |
2554 | unsigned int, | |
2555 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2556 | unsigned char* view, | |
fe8718a4 | 2557 | section_size_type view_size) |
56622147 ILT |
2558 | { |
2559 | // We need to examine the opcodes to figure out which instruction we | |
2560 | // are looking at. | |
2561 | ||
2562 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2563 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2564 | ||
2565 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2566 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2567 | ||
2568 | unsigned char op1 = view[-3]; | |
2569 | unsigned char op2 = view[-2]; | |
2570 | unsigned char op3 = view[-1]; | |
2571 | unsigned char reg = op3 >> 3; | |
2572 | ||
2573 | if (op2 == 0x8b) | |
2574 | { | |
2575 | // movq | |
2576 | if (op1 == 0x4c) | |
2577 | view[-3] = 0x49; | |
2578 | view[-2] = 0xc7; | |
2579 | view[-1] = 0xc0 | reg; | |
2580 | } | |
2581 | else if (reg == 4) | |
2582 | { | |
2583 | // Special handling for %rsp. | |
2584 | if (op1 == 0x4c) | |
2585 | view[-3] = 0x49; | |
2586 | view[-2] = 0x81; | |
2587 | view[-1] = 0xc0 | reg; | |
2588 | } | |
2589 | else | |
2590 | { | |
2591 | // addq | |
2592 | if (op1 == 0x4c) | |
2593 | view[-3] = 0x4d; | |
2594 | view[-2] = 0x8d; | |
2595 | view[-1] = 0x80 | reg | (reg << 3); | |
2596 | } | |
2597 | ||
6a41d30b | 2598 | value -= tls_segment->memsz(); |
56622147 ILT |
2599 | Relocate_functions<64, false>::rela32(view, value, 0); |
2600 | } | |
2601 | ||
2e30d253 ILT |
2602 | // Relocate section data. |
2603 | ||
2604 | void | |
364c7fa5 ILT |
2605 | Target_x86_64::relocate_section( |
2606 | const Relocate_info<64, false>* relinfo, | |
2607 | unsigned int sh_type, | |
2608 | const unsigned char* prelocs, | |
2609 | size_t reloc_count, | |
2610 | Output_section* output_section, | |
2611 | bool needs_special_offset_handling, | |
2612 | unsigned char* view, | |
2613 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2614 | section_size_type view_size, | |
2615 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2616 | { |
2617 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2618 | ||
2619 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2620 | Target_x86_64::Relocate>( | |
2621 | relinfo, | |
2622 | this, | |
2623 | prelocs, | |
2624 | reloc_count, | |
730cdc88 ILT |
2625 | output_section, |
2626 | needs_special_offset_handling, | |
2e30d253 ILT |
2627 | view, |
2628 | address, | |
364c7fa5 ILT |
2629 | view_size, |
2630 | reloc_symbol_changes); | |
2e30d253 ILT |
2631 | } |
2632 | ||
6a74a719 ILT |
2633 | // Return the size of a relocation while scanning during a relocatable |
2634 | // link. | |
2635 | ||
2636 | unsigned int | |
2637 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2638 | unsigned int r_type, | |
2639 | Relobj* object) | |
2640 | { | |
2641 | switch (r_type) | |
2642 | { | |
2643 | case elfcpp::R_X86_64_NONE: | |
2644 | case elfcpp::R_386_GNU_VTINHERIT: | |
2645 | case elfcpp::R_386_GNU_VTENTRY: | |
2646 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2647 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2648 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2649 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2650 | case elfcpp::R_X86_64_DTPOFF32: | |
2651 | case elfcpp::R_X86_64_DTPOFF64: | |
2652 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2653 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2654 | return 0; | |
2655 | ||
2656 | case elfcpp::R_X86_64_64: | |
2657 | case elfcpp::R_X86_64_PC64: | |
2658 | case elfcpp::R_X86_64_GOTOFF64: | |
2659 | case elfcpp::R_X86_64_GOTPC64: | |
2660 | case elfcpp::R_X86_64_PLTOFF64: | |
2661 | case elfcpp::R_X86_64_GOT64: | |
2662 | case elfcpp::R_X86_64_GOTPCREL64: | |
2663 | case elfcpp::R_X86_64_GOTPCREL: | |
2664 | case elfcpp::R_X86_64_GOTPLT64: | |
2665 | return 8; | |
2666 | ||
2667 | case elfcpp::R_X86_64_32: | |
2668 | case elfcpp::R_X86_64_32S: | |
2669 | case elfcpp::R_X86_64_PC32: | |
2670 | case elfcpp::R_X86_64_PLT32: | |
2671 | case elfcpp::R_X86_64_GOTPC32: | |
2672 | case elfcpp::R_X86_64_GOT32: | |
2673 | return 4; | |
2674 | ||
2675 | case elfcpp::R_X86_64_16: | |
2676 | case elfcpp::R_X86_64_PC16: | |
2677 | return 2; | |
2678 | ||
2679 | case elfcpp::R_X86_64_8: | |
2680 | case elfcpp::R_X86_64_PC8: | |
2681 | return 1; | |
2682 | ||
2683 | case elfcpp::R_X86_64_COPY: | |
2684 | case elfcpp::R_X86_64_GLOB_DAT: | |
2685 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2686 | case elfcpp::R_X86_64_RELATIVE: | |
2687 | // These are outstanding tls relocs, which are unexpected when linking | |
2688 | case elfcpp::R_X86_64_TPOFF64: | |
2689 | case elfcpp::R_X86_64_DTPMOD64: | |
2690 | case elfcpp::R_X86_64_TLSDESC: | |
2691 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2692 | return 0; | |
2693 | ||
2694 | case elfcpp::R_X86_64_SIZE32: | |
2695 | case elfcpp::R_X86_64_SIZE64: | |
2696 | default: | |
2697 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2698 | return 0; | |
2699 | } | |
2700 | } | |
2701 | ||
2702 | // Scan the relocs during a relocatable link. | |
2703 | ||
2704 | void | |
ad0f2072 | 2705 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2706 | Layout* layout, |
2707 | Sized_relobj<64, false>* object, | |
2708 | unsigned int data_shndx, | |
2709 | unsigned int sh_type, | |
2710 | const unsigned char* prelocs, | |
2711 | size_t reloc_count, | |
2712 | Output_section* output_section, | |
2713 | bool needs_special_offset_handling, | |
2714 | size_t local_symbol_count, | |
2715 | const unsigned char* plocal_symbols, | |
2716 | Relocatable_relocs* rr) | |
2717 | { | |
2718 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2719 | ||
2720 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2721 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2722 | ||
7019cd25 | 2723 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 2724 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2725 | symtab, |
2726 | layout, | |
2727 | object, | |
2728 | data_shndx, | |
2729 | prelocs, | |
2730 | reloc_count, | |
2731 | output_section, | |
2732 | needs_special_offset_handling, | |
2733 | local_symbol_count, | |
2734 | plocal_symbols, | |
2735 | rr); | |
2736 | } | |
2737 | ||
2738 | // Relocate a section during a relocatable link. | |
2739 | ||
2740 | void | |
2741 | Target_x86_64::relocate_for_relocatable( | |
2742 | const Relocate_info<64, false>* relinfo, | |
2743 | unsigned int sh_type, | |
2744 | const unsigned char* prelocs, | |
2745 | size_t reloc_count, | |
2746 | Output_section* output_section, | |
2747 | off_t offset_in_output_section, | |
2748 | const Relocatable_relocs* rr, | |
2749 | unsigned char* view, | |
2750 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2751 | section_size_type view_size, | |
2752 | unsigned char* reloc_view, | |
2753 | section_size_type reloc_view_size) | |
2754 | { | |
2755 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2756 | ||
7019cd25 | 2757 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2758 | relinfo, |
2759 | prelocs, | |
2760 | reloc_count, | |
2761 | output_section, | |
2762 | offset_in_output_section, | |
2763 | rr, | |
2764 | view, | |
2765 | view_address, | |
2766 | view_size, | |
2767 | reloc_view, | |
2768 | reloc_view_size); | |
2769 | } | |
2770 | ||
4fb6c25d ILT |
2771 | // Return the value to use for a dynamic which requires special |
2772 | // treatment. This is how we support equality comparisons of function | |
2773 | // pointers across shared library boundaries, as described in the | |
2774 | // processor specific ABI supplement. | |
2775 | ||
2776 | uint64_t | |
2777 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2778 | { | |
2779 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2780 | return this->plt_section()->address() + gsym->plt_offset(); | |
2781 | } | |
2782 | ||
2e30d253 ILT |
2783 | // Return a string used to fill a code section with nops to take up |
2784 | // the specified length. | |
2785 | ||
2786 | std::string | |
8851ecca | 2787 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2788 | { |
2789 | if (length >= 16) | |
2790 | { | |
2791 | // Build a jmpq instruction to skip over the bytes. | |
2792 | unsigned char jmp[5]; | |
2793 | jmp[0] = 0xe9; | |
04bf7072 | 2794 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2795 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2796 | + std::string(length - 5, '\0')); | |
2797 | } | |
2798 | ||
2799 | // Nop sequences of various lengths. | |
2800 | const char nop1[1] = { 0x90 }; // nop | |
2801 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2802 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2803 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2804 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2805 | 0x00 }; | |
2806 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2807 | 0x00, 0x00 }; |
1caf2c51 | 2808 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2809 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2810 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2811 | 0x00, 0x00, 0x00, 0x00 }; | |
2812 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2813 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2814 | 0x00 }; |
1caf2c51 ILT |
2815 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2816 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2817 | 0x00, 0x00 }; |
1caf2c51 ILT |
2818 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2819 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2820 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2821 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2822 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2823 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2824 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2825 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2826 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2827 | 0x00 }; |
1caf2c51 ILT |
2828 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2829 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2830 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2831 | 0x00, 0x00 }; |
1caf2c51 ILT |
2832 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2833 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2834 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2835 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2836 | |
2837 | const char* nops[16] = { | |
2838 | NULL, | |
2839 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2840 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2841 | }; | |
2842 | ||
2843 | return std::string(nops[length], length); | |
2844 | } | |
2845 | ||
e291e7b9 ILT |
2846 | // Return the addend to use for a target specific relocation. The |
2847 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
2848 | // symbol. We want to set the addend is the offset of the local | |
2849 | // symbol in the TLS segment. | |
2850 | ||
2851 | uint64_t | |
2852 | Target_x86_64::do_reloc_addend(void* arg, unsigned int r_type, | |
2853 | uint64_t) const | |
2854 | { | |
2855 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
2856 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
2857 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
2858 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
2859 | const Symbol_value<64>* psymval = ti.object->local_symbol(ti.r_sym); | |
2860 | gold_assert(psymval->is_tls_symbol()); | |
2861 | // The value of a TLS symbol is the offset in the TLS segment. | |
2862 | return psymval->value(ti.object, 0); | |
2863 | } | |
2864 | ||
364c7fa5 ILT |
2865 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2866 | // compiled with -fstack-split. The function calls non-stack-split | |
2867 | // code. We have to change the function so that it always ensures | |
2868 | // that it has enough stack space to run some random function. | |
2869 | ||
2870 | void | |
2871 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2872 | section_offset_type fnoffset, | |
2873 | section_size_type fnsize, | |
2874 | unsigned char* view, | |
2875 | section_size_type view_size, | |
2876 | std::string* from, | |
2877 | std::string* to) const | |
2878 | { | |
2879 | // The function starts with a comparison of the stack pointer and a | |
2880 | // field in the TCB. This is followed by a jump. | |
2881 | ||
2882 | // cmp %fs:NN,%rsp | |
2883 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
2884 | && fnsize > 9) | |
2885 | { | |
2886 | // We will call __morestack if the carry flag is set after this | |
2887 | // comparison. We turn the comparison into an stc instruction | |
2888 | // and some nops. | |
2889 | view[fnoffset] = '\xf9'; | |
2890 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
2891 | } | |
2892 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
2893 | // lea NN(%rsp),%r11 |
2894 | else if ((this->match_view(view, view_size, fnoffset, | |
2895 | "\x4c\x8d\x94\x24", 4) | |
2896 | || this->match_view(view, view_size, fnoffset, | |
2897 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
2898 | && fnsize > 8) |
2899 | { | |
2900 | // This is loading an offset from the stack pointer for a | |
2901 | // comparison. The offset is negative, so we decrease the | |
2902 | // offset by the amount of space we need for the stack. This | |
2903 | // means we will avoid calling __morestack if there happens to | |
2904 | // be plenty of space on the stack already. | |
2905 | unsigned char* pval = view + fnoffset + 4; | |
2906 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2907 | val -= parameters->options().split_stack_adjust_size(); | |
2908 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2909 | } | |
2910 | else | |
2911 | { | |
2912 | if (!object->has_no_split_stack()) | |
2913 | object->error(_("failed to match split-stack sequence at " | |
2914 | "section %u offset %0zx"), | |
ac33a407 | 2915 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2916 | return; |
2917 | } | |
2918 | ||
2919 | // We have to change the function so that it calls | |
2920 | // __morestack_non_split instead of __morestack. The former will | |
2921 | // allocate additional stack space. | |
2922 | *from = "__morestack"; | |
2923 | *to = "__morestack_non_split"; | |
2924 | } | |
2925 | ||
2e30d253 ILT |
2926 | // The selector for x86_64 object files. |
2927 | ||
36959681 | 2928 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
2929 | { |
2930 | public: | |
2931 | Target_selector_x86_64() | |
36959681 ILT |
2932 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
2933 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
2934 | { } |
2935 | ||
2936 | Target* | |
e96caa79 ILT |
2937 | do_instantiate_target() |
2938 | { return new Target_x86_64(); } | |
36959681 | 2939 | |
2e30d253 ILT |
2940 | }; |
2941 | ||
2e30d253 ILT |
2942 | Target_selector_x86_64 target_selector_x86_64; |
2943 | ||
2944 | } // End anonymous namespace. |