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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 | ||
9f1d377b ILT |
550 | Output_section* os; |
551 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
552 | (elfcpp::SHF_ALLOC | |
553 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
554 | this->got_, false, true, true, |
555 | false); | |
2e30d253 | 556 | |
7d9e3d98 | 557 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
1a2dff53 | 558 | os = layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
9f1d377b ILT |
559 | (elfcpp::SHF_ALLOC |
560 | | elfcpp::SHF_WRITE), | |
1a2dff53 ILT |
561 | this->got_plt_, false, false, |
562 | false, true); | |
2e30d253 ILT |
563 | |
564 | // The first three entries are reserved. | |
27bc2bce | 565 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 566 | |
1a2dff53 ILT |
567 | // Those bytes can go into the relro segment. |
568 | layout->increase_relro(3 * 8); | |
569 | ||
2e30d253 | 570 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
571 | this->global_offset_table_ = |
572 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
573 | Symbol_table::PREDEFINED, | |
574 | this->got_plt_, | |
575 | 0, 0, elfcpp::STT_OBJECT, | |
576 | elfcpp::STB_LOCAL, | |
577 | elfcpp::STV_HIDDEN, 0, | |
578 | false, false); | |
2e30d253 ILT |
579 | } |
580 | ||
581 | return this->got_; | |
582 | } | |
583 | ||
584 | // Get the dynamic reloc section, creating it if necessary. | |
585 | ||
586 | Target_x86_64::Reloc_section* | |
0ffd9845 | 587 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 588 | { |
0ffd9845 | 589 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
590 | { |
591 | gold_assert(layout != NULL); | |
d98bc257 | 592 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 593 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
1a2dff53 ILT |
594 | elfcpp::SHF_ALLOC, this->rela_dyn_, true, |
595 | false, false, false); | |
2e30d253 | 596 | } |
0ffd9845 | 597 | return this->rela_dyn_; |
2e30d253 ILT |
598 | } |
599 | ||
600 | // A class to handle the PLT data. | |
601 | ||
602 | class Output_data_plt_x86_64 : public Output_section_data | |
603 | { | |
604 | public: | |
605 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
606 | ||
c2b45e22 CC |
607 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
608 | Output_data_space*); | |
2e30d253 ILT |
609 | |
610 | // Add an entry to the PLT. | |
611 | void | |
612 | add_entry(Symbol* gsym); | |
613 | ||
c2b45e22 CC |
614 | // Add the reserved TLSDESC_PLT entry to the PLT. |
615 | void | |
616 | reserve_tlsdesc_entry(unsigned int got_offset) | |
617 | { this->tlsdesc_got_offset_ = got_offset; } | |
618 | ||
619 | // Return true if a TLSDESC_PLT entry has been reserved. | |
620 | bool | |
621 | has_tlsdesc_entry() const | |
622 | { return this->tlsdesc_got_offset_ != -1U; } | |
623 | ||
624 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
625 | unsigned int | |
626 | get_tlsdesc_got_offset() const | |
627 | { return this->tlsdesc_got_offset_; } | |
628 | ||
629 | // Return the offset of the reserved TLSDESC_PLT entry. | |
630 | unsigned int | |
631 | get_tlsdesc_plt_offset() const | |
632 | { return (this->count_ + 1) * plt_entry_size; } | |
633 | ||
e291e7b9 | 634 | // Return the .rela.plt section data. |
2e30d253 | 635 | const Reloc_section* |
e291e7b9 | 636 | rela_plt() const |
2e30d253 ILT |
637 | { return this->rel_; } |
638 | ||
e291e7b9 ILT |
639 | // Return where the TLSDESC relocations should go. |
640 | Reloc_section* | |
641 | rela_tlsdesc(Layout*); | |
642 | ||
2e30d253 ILT |
643 | protected: |
644 | void | |
645 | do_adjust_output_section(Output_section* os); | |
646 | ||
7d9e3d98 ILT |
647 | // Write to a map file. |
648 | void | |
649 | do_print_to_mapfile(Mapfile* mapfile) const | |
650 | { mapfile->print_output_data(this, _("** PLT")); } | |
651 | ||
2e30d253 ILT |
652 | private: |
653 | // The size of an entry in the PLT. | |
654 | static const int plt_entry_size = 16; | |
655 | ||
656 | // The first entry in the PLT. | |
657 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
658 | // procedure linkage table for both programs and shared objects." | |
659 | static unsigned char first_plt_entry[plt_entry_size]; | |
660 | ||
661 | // Other entries in the PLT for an executable. | |
662 | static unsigned char plt_entry[plt_entry_size]; | |
663 | ||
c2b45e22 CC |
664 | // The reserved TLSDESC entry in the PLT for an executable. |
665 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
666 | ||
2e30d253 ILT |
667 | // Set the final size. |
668 | void | |
c2b45e22 | 669 | set_final_data_size(); |
2e30d253 ILT |
670 | |
671 | // Write out the PLT data. | |
672 | void | |
673 | do_write(Output_file*); | |
674 | ||
675 | // The reloc section. | |
676 | Reloc_section* rel_; | |
e291e7b9 ILT |
677 | // The TLSDESC relocs, if necessary. These must follow the regular |
678 | // PLT relocs. | |
679 | Reloc_section* tlsdesc_rel_; | |
c2b45e22 CC |
680 | // The .got section. |
681 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
682 | // The .got.plt section. |
683 | Output_data_space* got_plt_; | |
684 | // The number of PLT entries. | |
685 | unsigned int count_; | |
c2b45e22 CC |
686 | // Offset of the reserved TLSDESC_GOT entry when needed. |
687 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
688 | }; |
689 | ||
690 | // Create the PLT section. The ordinary .got section is an argument, | |
691 | // since we need to refer to the start. We also create our own .got | |
692 | // section just for PLT entries. | |
693 | ||
694 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 695 | Output_data_got<64, false>* got, |
2e30d253 | 696 | Output_data_space* got_plt) |
e291e7b9 ILT |
697 | : Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), |
698 | count_(0), tlsdesc_got_offset_(-1U) | |
2e30d253 | 699 | { |
d98bc257 | 700 | this->rel_ = new Reloc_section(false); |
2e30d253 | 701 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
1a2dff53 ILT |
702 | elfcpp::SHF_ALLOC, this->rel_, true, |
703 | false, false, false); | |
2e30d253 ILT |
704 | } |
705 | ||
706 | void | |
707 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
708 | { | |
b0481b0b | 709 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
710 | } |
711 | ||
712 | // Add an entry to the PLT. | |
713 | ||
714 | void | |
715 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
716 | { | |
717 | gold_assert(!gsym->has_plt_offset()); | |
718 | ||
719 | // Note that when setting the PLT offset we skip the initial | |
720 | // reserved PLT entry. | |
721 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
722 | ||
723 | ++this->count_; | |
724 | ||
fe8718a4 | 725 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
726 | |
727 | // Every PLT entry needs a GOT entry which points back to the PLT | |
728 | // entry (this will be changed by the dynamic linker, normally | |
729 | // lazily when the function is called). | |
27bc2bce | 730 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
731 | |
732 | // Every PLT entry needs a reloc. | |
733 | gsym->set_needs_dynsym_entry(); | |
734 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
735 | got_offset, 0); | |
736 | ||
737 | // Note that we don't need to save the symbol. The contents of the | |
738 | // PLT are independent of which symbols are used. The symbols only | |
739 | // appear in the relocations. | |
740 | } | |
741 | ||
e291e7b9 ILT |
742 | // Return where the TLSDESC relocations should go, creating it if |
743 | // necessary. These follow the JUMP_SLOT relocations. | |
744 | ||
745 | Output_data_plt_x86_64::Reloc_section* | |
746 | Output_data_plt_x86_64::rela_tlsdesc(Layout* layout) | |
747 | { | |
748 | if (this->tlsdesc_rel_ == NULL) | |
749 | { | |
750 | this->tlsdesc_rel_ = new Reloc_section(false); | |
751 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
752 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
753 | true, false, false, false); | |
754 | gold_assert(this->tlsdesc_rel_->output_section() == | |
755 | this->rel_->output_section()); | |
756 | } | |
757 | return this->tlsdesc_rel_; | |
758 | } | |
759 | ||
c2b45e22 CC |
760 | // Set the final size. |
761 | void | |
762 | Output_data_plt_x86_64::set_final_data_size() | |
763 | { | |
764 | unsigned int count = this->count_; | |
765 | if (this->has_tlsdesc_entry()) | |
766 | ++count; | |
767 | this->set_data_size((count + 1) * plt_entry_size); | |
768 | } | |
769 | ||
2e30d253 ILT |
770 | // The first entry in the PLT for an executable. |
771 | ||
772 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
773 | { | |
774 | // From AMD64 ABI Draft 0.98, page 76 | |
775 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 776 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
777 | 0xff, 0x25, // jmp indirect |
778 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
779 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
780 | }; | |
781 | ||
782 | // Subsequent entries in the PLT for an executable. | |
783 | ||
784 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
785 | { | |
786 | // From AMD64 ABI Draft 0.98, page 76 | |
787 | 0xff, 0x25, // jmpq indirect | |
788 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
789 | 0x68, // pushq immediate | |
790 | 0, 0, 0, 0, // replaced with offset into relocation table | |
791 | 0xe9, // jmpq relative | |
792 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
793 | }; | |
794 | ||
c2b45e22 CC |
795 | // The reserved TLSDESC entry in the PLT for an executable. |
796 | ||
797 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
798 | { | |
799 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
800 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
801 | 0xff, 0x35, // pushq x(%rip) | |
802 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
803 | 0xff, 0x25, // jmpq *y(%rip) | |
804 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
805 | 0x0f, 0x1f, // nop | |
806 | 0x40, 0 | |
807 | }; | |
808 | ||
2e30d253 ILT |
809 | // Write out the PLT. This uses the hand-coded instructions above, |
810 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
811 | ||
812 | void | |
813 | Output_data_plt_x86_64::do_write(Output_file* of) | |
814 | { | |
2ea97941 | 815 | const off_t offset = this->offset(); |
fe8718a4 ILT |
816 | const section_size_type oview_size = |
817 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 818 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
819 | |
820 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
821 | const section_size_type got_size = |
822 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
823 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
824 | got_size); | |
825 | ||
826 | unsigned char* pov = oview; | |
827 | ||
c2b45e22 | 828 | // The base address of the .plt section. |
a984ee1d | 829 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 830 | // The base address of the .got section. |
a984ee1d | 831 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
832 | // The base address of the PLT portion of the .got section, |
833 | // which is where the GOT pointer will point, and where the | |
834 | // three reserved GOT entries are located. | |
a984ee1d | 835 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
836 | |
837 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 838 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
839 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
840 | (got_address + 8 | |
841 | - (plt_address + 6))); | |
842 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
843 | (got_address + 16 | |
844 | - (plt_address + 12))); | |
2e30d253 ILT |
845 | pov += plt_entry_size; |
846 | ||
847 | unsigned char* got_pov = got_view; | |
848 | ||
849 | memset(got_pov, 0, 24); | |
850 | got_pov += 24; | |
851 | ||
852 | unsigned int plt_offset = plt_entry_size; | |
853 | unsigned int got_offset = 24; | |
854 | const unsigned int count = this->count_; | |
855 | for (unsigned int plt_index = 0; | |
856 | plt_index < count; | |
857 | ++plt_index, | |
858 | pov += plt_entry_size, | |
859 | got_pov += 8, | |
860 | plt_offset += plt_entry_size, | |
861 | got_offset += 8) | |
862 | { | |
863 | // Set and adjust the PLT entry itself. | |
864 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
865 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
866 | (got_address + got_offset | |
867 | - (plt_address + plt_offset | |
868 | + 6))); | |
2e30d253 ILT |
869 | |
870 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
871 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
872 | - (plt_offset + plt_entry_size)); | |
873 | ||
874 | // Set the entry in the GOT. | |
875 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
876 | } | |
877 | ||
c2b45e22 CC |
878 | if (this->has_tlsdesc_entry()) |
879 | { | |
880 | // Set and adjust the reserved TLSDESC PLT entry. | |
881 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
882 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
883 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
884 | (got_address + 8 | |
885 | - (plt_address + plt_offset | |
886 | + 6))); | |
887 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
888 | (got_base | |
889 | + tlsdesc_got_offset | |
890 | - (plt_address + plt_offset | |
891 | + 12))); | |
892 | pov += plt_entry_size; | |
893 | } | |
894 | ||
fe8718a4 ILT |
895 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
896 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 897 | |
2ea97941 | 898 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
899 | of->write_output_view(got_file_offset, got_size, got_view); |
900 | } | |
901 | ||
c2b45e22 | 902 | // Create the PLT section. |
2e30d253 ILT |
903 | |
904 | void | |
c2b45e22 | 905 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 906 | { |
2e30d253 ILT |
907 | if (this->plt_ == NULL) |
908 | { | |
909 | // Create the GOT sections first. | |
910 | this->got_section(symtab, layout); | |
911 | ||
c2b45e22 CC |
912 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
913 | this->got_plt_); | |
2e30d253 ILT |
914 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
915 | (elfcpp::SHF_ALLOC | |
916 | | elfcpp::SHF_EXECINSTR), | |
1a2dff53 | 917 | this->plt_, false, false, false, false); |
2e30d253 | 918 | } |
c2b45e22 CC |
919 | } |
920 | ||
e291e7b9 ILT |
921 | // Return the section for TLSDESC relocations. |
922 | ||
923 | Target_x86_64::Reloc_section* | |
924 | Target_x86_64::rela_tlsdesc_section(Layout* layout) const | |
925 | { | |
926 | return this->plt_section()->rela_tlsdesc(layout); | |
927 | } | |
928 | ||
c2b45e22 CC |
929 | // Create a PLT entry for a global symbol. |
930 | ||
931 | void | |
932 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
933 | Symbol* gsym) | |
934 | { | |
935 | if (gsym->has_plt_offset()) | |
936 | return; | |
937 | ||
938 | if (this->plt_ == NULL) | |
939 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
940 | |
941 | this->plt_->add_entry(gsym); | |
942 | } | |
943 | ||
9fa33bee | 944 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
945 | |
946 | void | |
947 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
948 | { | |
949 | if (this->tls_base_symbol_defined_) | |
950 | return; | |
951 | ||
952 | Output_segment* tls_segment = layout->tls_segment(); | |
953 | if (tls_segment != NULL) | |
954 | { | |
183fd0e3 | 955 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 956 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 957 | Symbol_table::PREDEFINED, |
edfbb029 CC |
958 | tls_segment, 0, 0, |
959 | elfcpp::STT_TLS, | |
960 | elfcpp::STB_LOCAL, | |
961 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
962 | (is_exec |
963 | ? Symbol::SEGMENT_END | |
964 | : Symbol::SEGMENT_START), | |
965 | true); | |
edfbb029 CC |
966 | } |
967 | this->tls_base_symbol_defined_ = true; | |
968 | } | |
969 | ||
c2b45e22 CC |
970 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
971 | ||
972 | void | |
973 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
974 | Layout* layout) | |
975 | { | |
976 | if (this->plt_ == NULL) | |
977 | this->make_plt_section(symtab, layout); | |
978 | ||
979 | if (!this->plt_->has_tlsdesc_entry()) | |
980 | { | |
981 | // Allocate the TLSDESC_GOT entry. | |
982 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
983 | unsigned int got_offset = got->add_constant(0); | |
984 | ||
985 | // Allocate the TLSDESC_PLT entry. | |
986 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
987 | } | |
988 | } | |
989 | ||
31d60480 ILT |
990 | // Create a GOT entry for the TLS module index. |
991 | ||
992 | unsigned int | |
993 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
994 | Sized_relobj<64, false>* object) | |
995 | { | |
996 | if (this->got_mod_index_offset_ == -1U) | |
997 | { | |
998 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
999 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1000 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1001 | unsigned int got_offset = got->add_constant(0); | |
1002 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1003 | got_offset, 0); | |
009a67a2 | 1004 | got->add_constant(0); |
31d60480 ILT |
1005 | this->got_mod_index_offset_ = got_offset; |
1006 | } | |
1007 | return this->got_mod_index_offset_; | |
1008 | } | |
1009 | ||
2e30d253 ILT |
1010 | // Optimize the TLS relocation type based on what we know about the |
1011 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1012 | // known at link time. | |
1013 | ||
e041f13d | 1014 | tls::Tls_optimization |
2e30d253 ILT |
1015 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
1016 | { | |
2e30d253 ILT |
1017 | // If we are generating a shared library, then we can't do anything |
1018 | // in the linker. | |
8851ecca | 1019 | if (parameters->options().shared()) |
e041f13d | 1020 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1021 | |
1022 | switch (r_type) | |
1023 | { | |
1024 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1025 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1026 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1027 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1028 | // access. Since we know that we are generating an executable, |
1029 | // we can convert this to Initial-Exec. If we also know that | |
1030 | // this is a local symbol, we can further switch to Local-Exec. | |
1031 | if (is_final) | |
e041f13d ILT |
1032 | return tls::TLSOPT_TO_LE; |
1033 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1034 | |
d61c17ea | 1035 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1036 | // This is Local-Dynamic, which refers to a local symbol in the |
1037 | // dynamic TLS block. Since we know that we generating an | |
1038 | // executable, we can switch to Local-Exec. | |
e041f13d | 1039 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1040 | |
0ffd9845 | 1041 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1042 | case elfcpp::R_X86_64_DTPOFF64: |
1043 | // Another Local-Dynamic reloc. | |
e041f13d | 1044 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1045 | |
d61c17ea | 1046 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1047 | // These are Initial-Exec relocs which get the thread offset |
1048 | // from the GOT. If we know that we are linking against the | |
1049 | // local symbol, we can switch to Local-Exec, which links the | |
1050 | // thread offset into the instruction. | |
1051 | if (is_final) | |
e041f13d ILT |
1052 | return tls::TLSOPT_TO_LE; |
1053 | return tls::TLSOPT_NONE; | |
2e30d253 | 1054 | |
d61c17ea | 1055 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1056 | // When we already have Local-Exec, there is nothing further we |
1057 | // can do. | |
e041f13d | 1058 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1059 | |
1060 | default: | |
1061 | gold_unreachable(); | |
1062 | } | |
2e30d253 ILT |
1063 | } |
1064 | ||
e041f13d ILT |
1065 | // Report an unsupported relocation against a local symbol. |
1066 | ||
1067 | void | |
1068 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
1069 | unsigned int r_type) | |
1070 | { | |
75f2446e ILT |
1071 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1072 | object->name().c_str(), r_type); | |
e041f13d ILT |
1073 | } |
1074 | ||
a036edd8 ILT |
1075 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1076 | // dynamic linker does not support it, issue an error. The GNU linker | |
1077 | // only issues a non-PIC error for an allocated read-only section. | |
1078 | // Here we know the section is allocated, but we don't know that it is | |
1079 | // read-only. But we check for all the relocation types which the | |
1080 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
1081 | // error even if the section is not read-only. | |
1082 | ||
1083 | void | |
1084 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
1085 | { | |
1086 | switch (r_type) | |
1087 | { | |
1088 | // These are the relocation types supported by glibc for x86_64. | |
1089 | case elfcpp::R_X86_64_RELATIVE: | |
1090 | case elfcpp::R_X86_64_GLOB_DAT: | |
1091 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1092 | case elfcpp::R_X86_64_DTPMOD64: | |
1093 | case elfcpp::R_X86_64_DTPOFF64: | |
1094 | case elfcpp::R_X86_64_TPOFF64: | |
1095 | case elfcpp::R_X86_64_64: | |
1096 | case elfcpp::R_X86_64_32: | |
1097 | case elfcpp::R_X86_64_PC32: | |
1098 | case elfcpp::R_X86_64_COPY: | |
1099 | return; | |
1100 | ||
1101 | default: | |
1102 | // This prevents us from issuing more than one error per reloc | |
1103 | // section. But we can still wind up issuing more than one | |
1104 | // error per object file. | |
1105 | if (this->issued_non_pic_error_) | |
1106 | return; | |
33aea2fd | 1107 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
1108 | object->error(_("requires unsupported dynamic reloc; " |
1109 | "recompile with -fPIC")); | |
1110 | this->issued_non_pic_error_ = true; | |
1111 | return; | |
1112 | ||
1113 | case elfcpp::R_X86_64_NONE: | |
1114 | gold_unreachable(); | |
1115 | } | |
1116 | } | |
1117 | ||
2e30d253 ILT |
1118 | // Scan a relocation for a local symbol. |
1119 | ||
1120 | inline void | |
ad0f2072 | 1121 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1122 | Layout* layout, |
1123 | Target_x86_64* target, | |
1124 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1125 | unsigned int data_shndx, |
4f4c5f80 | 1126 | Output_section* output_section, |
0ffd9845 | 1127 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1128 | unsigned int r_type, |
7bf1f802 | 1129 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1130 | { |
1131 | switch (r_type) | |
1132 | { | |
1133 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1134 | case elfcpp::R_386_GNU_VTINHERIT: |
1135 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1136 | break; |
1137 | ||
1138 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1139 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1140 | // executable), we need to create a dynamic relocation for this |
1141 | // location. The relocation applied at link time will apply the | |
1142 | // link-time value, so we flag the location with an | |
1143 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1144 | // relocate it easily. |
8851ecca | 1145 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1146 | { |
e8c846c3 | 1147 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1148 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1149 | rela_dyn->add_local_relative(object, r_sym, |
1150 | elfcpp::R_X86_64_RELATIVE, | |
1151 | output_section, data_shndx, | |
1152 | reloc.get_r_offset(), | |
1153 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1154 | } |
1155 | break; | |
1156 | ||
2e30d253 ILT |
1157 | case elfcpp::R_X86_64_32: |
1158 | case elfcpp::R_X86_64_32S: | |
1159 | case elfcpp::R_X86_64_16: | |
1160 | case elfcpp::R_X86_64_8: | |
96f2030e | 1161 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1162 | // executable), we need to create a dynamic relocation for this |
1163 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1164 | // because that is always a 64-bit relocation. | |
8851ecca | 1165 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1166 | { |
a036edd8 ILT |
1167 | this->check_non_pic(object, r_type); |
1168 | ||
96f2030e | 1169 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1170 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1171 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1172 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1173 | data_shndx, reloc.get_r_offset(), | |
1174 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1175 | else |
1176 | { | |
1177 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1178 | unsigned int shndx = lsym.get_st_shndx(); |
1179 | bool is_ordinary; | |
1180 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1181 | &is_ordinary); | |
1182 | if (!is_ordinary) | |
1183 | object->error(_("section symbol %u has bad shndx %u"), | |
1184 | r_sym, shndx); | |
1185 | else | |
1186 | rela_dyn->add_local_section(object, shndx, | |
1187 | r_type, output_section, | |
1188 | data_shndx, reloc.get_r_offset(), | |
1189 | reloc.get_r_addend()); | |
dceae3c1 | 1190 | } |
96f2030e | 1191 | } |
2e30d253 ILT |
1192 | break; |
1193 | ||
1194 | case elfcpp::R_X86_64_PC64: | |
1195 | case elfcpp::R_X86_64_PC32: | |
1196 | case elfcpp::R_X86_64_PC16: | |
1197 | case elfcpp::R_X86_64_PC8: | |
1198 | break; | |
1199 | ||
f389a824 ILT |
1200 | case elfcpp::R_X86_64_PLT32: |
1201 | // Since we know this is a local symbol, we can handle this as a | |
1202 | // PC32 reloc. | |
1203 | break; | |
1204 | ||
fdc2f80f | 1205 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1206 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1207 | case elfcpp::R_X86_64_GOTPC64: |
1208 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1209 | // We need a GOT section. |
1210 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1211 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1212 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1213 | break; |
1214 | ||
0ffd9845 ILT |
1215 | case elfcpp::R_X86_64_GOT64: |
1216 | case elfcpp::R_X86_64_GOT32: | |
1217 | case elfcpp::R_X86_64_GOTPCREL64: | |
1218 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1219 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1220 | { |
1221 | // The symbol requires a GOT entry. | |
1222 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1223 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1224 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1225 | { |
1226 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1227 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1228 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1229 | { |
1230 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1231 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1232 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1233 | rela_dyn->add_local_relative( |
1234 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1235 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1236 | else |
dceae3c1 | 1237 | { |
a036edd8 ILT |
1238 | this->check_non_pic(object, r_type); |
1239 | ||
dceae3c1 | 1240 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1241 | rela_dyn->add_local( |
1242 | object, r_sym, r_type, got, | |
1243 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1244 | } |
0ffd9845 ILT |
1245 | } |
1246 | } | |
ee9e9e86 ILT |
1247 | // For GOTPLT64, we'd normally want a PLT section, but since |
1248 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1249 | } |
1250 | break; | |
1251 | ||
2e30d253 ILT |
1252 | case elfcpp::R_X86_64_COPY: |
1253 | case elfcpp::R_X86_64_GLOB_DAT: | |
1254 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1255 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1256 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1257 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1258 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1259 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1260 | gold_error(_("%s: unexpected reloc %u in object file"), |
1261 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1262 | break; |
1263 | ||
d61c17ea | 1264 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1265 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1266 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1267 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1268 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1269 | case elfcpp::R_X86_64_DTPOFF32: |
1270 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1271 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1272 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1273 | { |
8851ecca | 1274 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1275 | const tls::Tls_optimization optimized_type |
1276 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1277 | switch (r_type) |
1278 | { | |
56622147 | 1279 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1280 | if (optimized_type == tls::TLSOPT_NONE) |
1281 | { | |
1282 | // Create a pair of GOT entries for the module index and | |
1283 | // dtv-relative offset. | |
1284 | Output_data_got<64, false>* got | |
1285 | = target->got_section(symtab, layout); | |
1286 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1287 | unsigned int shndx = lsym.get_st_shndx(); |
1288 | bool is_ordinary; | |
1289 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1290 | if (!is_ordinary) | |
1291 | object->error(_("local symbol %u has bad shndx %u"), | |
1292 | r_sym, shndx); | |
1293 | else | |
1294 | got->add_local_pair_with_rela(object, r_sym, | |
1295 | shndx, | |
1296 | GOT_TYPE_TLS_PAIR, | |
1297 | target->rela_dyn_section(layout), | |
1298 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1299 | } |
1300 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1301 | unsupported_reloc_local(object, r_type); | |
1302 | break; | |
1303 | ||
56622147 | 1304 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1305 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1306 | if (optimized_type == tls::TLSOPT_NONE) |
1307 | { | |
1308 | // Create reserved PLT and GOT entries for the resolver. | |
1309 | target->reserve_tlsdesc_entries(symtab, layout); | |
1310 | ||
1311 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1312 | Output_data_got<64, false>* got | |
1313 | = target->got_section(symtab, layout); | |
1314 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
e291e7b9 ILT |
1315 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1316 | { | |
1317 | unsigned int got_offset = got->add_constant(0); | |
1318 | got->add_constant(0); | |
1319 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1320 | got_offset); | |
1321 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
1322 | // We store the arguments we need in a vector, and | |
1323 | // use the index into the vector as the parameter | |
1324 | // to pass to the target specific routines. | |
1325 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
1326 | void* arg = reinterpret_cast<void*>(intarg); | |
1327 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1328 | got, got_offset, 0); | |
1329 | } | |
c2b45e22 CC |
1330 | } |
1331 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1332 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1333 | break; |
1334 | ||
c2b45e22 CC |
1335 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1336 | break; | |
1337 | ||
e041f13d | 1338 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1339 | if (optimized_type == tls::TLSOPT_NONE) |
1340 | { | |
1341 | // Create a GOT entry for the module index. | |
31d60480 | 1342 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1343 | } |
1344 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1345 | unsupported_reloc_local(object, r_type); | |
1346 | break; | |
1347 | ||
0ffd9845 ILT |
1348 | case elfcpp::R_X86_64_DTPOFF32: |
1349 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1350 | break; |
1351 | ||
56622147 | 1352 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1353 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1354 | if (optimized_type == tls::TLSOPT_NONE) |
1355 | { | |
1356 | // Create a GOT entry for the tp-relative offset. | |
1357 | Output_data_got<64, false>* got | |
1358 | = target->got_section(symtab, layout); | |
1359 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1360 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1361 | target->rela_dyn_section(layout), |
1362 | elfcpp::R_X86_64_TPOFF64); | |
1363 | } | |
1364 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1365 | unsupported_reloc_local(object, r_type); |
1366 | break; | |
0ffd9845 | 1367 | |
56622147 | 1368 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1369 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1370 | if (output_is_shared) |
1371 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1372 | break; |
e041f13d ILT |
1373 | |
1374 | default: | |
1375 | gold_unreachable(); | |
2e30d253 ILT |
1376 | } |
1377 | } | |
1378 | break; | |
2e30d253 | 1379 | |
fdc2f80f ILT |
1380 | case elfcpp::R_X86_64_SIZE32: |
1381 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1382 | default: |
75f2446e ILT |
1383 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1384 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1385 | break; |
1386 | } | |
1387 | } | |
1388 | ||
1389 | ||
e041f13d ILT |
1390 | // Report an unsupported relocation against a global symbol. |
1391 | ||
1392 | void | |
1393 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1394 | unsigned int r_type, | |
1395 | Symbol* gsym) | |
1396 | { | |
75f2446e | 1397 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1398 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1399 | } |
1400 | ||
ce97fa81 | 1401 | // Returns true if this relocation type could be that of a function pointer. |
21bb3914 ST |
1402 | inline bool |
1403 | Target_x86_64::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1404 | { | |
21bb3914 ST |
1405 | switch (r_type) |
1406 | { | |
1407 | case elfcpp::R_X86_64_64: | |
1408 | case elfcpp::R_X86_64_32: | |
1409 | case elfcpp::R_X86_64_32S: | |
1410 | case elfcpp::R_X86_64_16: | |
1411 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
1412 | case elfcpp::R_X86_64_GOT64: |
1413 | case elfcpp::R_X86_64_GOT32: | |
1414 | case elfcpp::R_X86_64_GOTPCREL64: | |
1415 | case elfcpp::R_X86_64_GOTPCREL: | |
1416 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
1417 | { |
1418 | return true; | |
1419 | } | |
1420 | } | |
1421 | return false; | |
1422 | } | |
1423 | ||
1424 | // For safe ICF, scan a relocation for a local symbol to check if it | |
1425 | // corresponds to a function pointer being taken. In that case mark | |
1426 | // the function whose pointer was taken as not foldable. | |
1427 | ||
1428 | inline bool | |
1429 | Target_x86_64::Scan::local_reloc_may_be_function_pointer( | |
1430 | Symbol_table* , | |
1431 | Layout* , | |
1432 | Target_x86_64* , | |
1433 | Sized_relobj<64, false>* , | |
1434 | unsigned int , | |
1435 | Output_section* , | |
1436 | const elfcpp::Rela<64, false>& , | |
1437 | unsigned int r_type, | |
1438 | const elfcpp::Sym<64, false>&) | |
1439 | { | |
1440 | // When building a shared library, do not fold any local symbols as it is | |
1441 | // not possible to distinguish pointer taken versus a call by looking at | |
1442 | // the relocation types. | |
1443 | return (parameters->options().shared() | |
1444 | || possible_function_pointer_reloc(r_type)); | |
1445 | } | |
1446 | ||
1447 | // For safe ICF, scan a relocation for a global symbol to check if it | |
1448 | // corresponds to a function pointer being taken. In that case mark | |
1449 | // the function whose pointer was taken as not foldable. | |
1450 | ||
1451 | inline bool | |
1452 | Target_x86_64::Scan::global_reloc_may_be_function_pointer( | |
1453 | Symbol_table*, | |
1454 | Layout* , | |
1455 | Target_x86_64* , | |
1456 | Sized_relobj<64, false>* , | |
1457 | unsigned int , | |
1458 | Output_section* , | |
1459 | const elfcpp::Rela<64, false>& , | |
1460 | unsigned int r_type, | |
1461 | Symbol* gsym) | |
1462 | { | |
1463 | // When building a shared library, do not fold symbols whose visibility | |
1464 | // is hidden, internal or protected. | |
1465 | return ((parameters->options().shared() | |
1466 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
1467 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
1468 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
1469 | || possible_function_pointer_reloc(r_type)); | |
1470 | } | |
1471 | ||
2e30d253 ILT |
1472 | // Scan a relocation for a global symbol. |
1473 | ||
1474 | inline void | |
ad0f2072 | 1475 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1476 | Layout* layout, |
1477 | Target_x86_64* target, | |
1478 | Sized_relobj<64, false>* object, | |
1479 | unsigned int data_shndx, | |
4f4c5f80 | 1480 | Output_section* output_section, |
d61c17ea ILT |
1481 | const elfcpp::Rela<64, false>& reloc, |
1482 | unsigned int r_type, | |
1483 | Symbol* gsym) | |
2e30d253 ILT |
1484 | { |
1485 | switch (r_type) | |
1486 | { | |
1487 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1488 | case elfcpp::R_386_GNU_VTINHERIT: |
1489 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1490 | break; |
1491 | ||
1492 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1493 | case elfcpp::R_X86_64_32: |
1494 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1495 | case elfcpp::R_X86_64_16: |
2e30d253 | 1496 | case elfcpp::R_X86_64_8: |
96f2030e | 1497 | { |
d61c6bd4 ILT |
1498 | // Make a PLT entry if necessary. |
1499 | if (gsym->needs_plt_entry()) | |
1500 | { | |
1501 | target->make_plt_entry(symtab, layout, gsym); | |
1502 | // Since this is not a PC-relative relocation, we may be | |
1503 | // taking the address of a function. In that case we need to | |
1504 | // set the entry in the dynamic symbol table to the address of | |
1505 | // the PLT entry. | |
8851ecca | 1506 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1507 | gsym->set_needs_dynsym_value(); |
1508 | } | |
1509 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1510 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1511 | { |
966d4097 | 1512 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1513 | { |
12c0daef | 1514 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1515 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1516 | } |
1517 | else if (r_type == elfcpp::R_X86_64_64 | |
1518 | && gsym->can_use_relative_reloc(false)) | |
1519 | { | |
1520 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1521 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1522 | output_section, object, | |
1523 | data_shndx, reloc.get_r_offset(), | |
1524 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1525 | } |
1526 | else | |
1527 | { | |
a036edd8 | 1528 | this->check_non_pic(object, r_type); |
96f2030e | 1529 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1530 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1531 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1532 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1533 | } |
1534 | } | |
1535 | } | |
1536 | break; | |
1537 | ||
1538 | case elfcpp::R_X86_64_PC64: | |
1539 | case elfcpp::R_X86_64_PC32: | |
1540 | case elfcpp::R_X86_64_PC16: | |
1541 | case elfcpp::R_X86_64_PC8: | |
1542 | { | |
1543 | // Make a PLT entry if necessary. | |
1544 | if (gsym->needs_plt_entry()) | |
1545 | target->make_plt_entry(symtab, layout, gsym); | |
1546 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1547 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1548 | if (gsym->is_func()) |
0700cf32 ILT |
1549 | flags |= Symbol::FUNCTION_CALL; |
1550 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1551 | { |
966d4097 | 1552 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1553 | { |
12c0daef | 1554 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1555 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1556 | } |
86849f1f | 1557 | else |
d61c6bd4 | 1558 | { |
a036edd8 | 1559 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1560 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1561 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1562 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1563 | reloc.get_r_addend()); |
1564 | } | |
86849f1f | 1565 | } |
d61c6bd4 | 1566 | } |
2e30d253 ILT |
1567 | break; |
1568 | ||
ff006520 | 1569 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1570 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1571 | case elfcpp::R_X86_64_GOTPCREL64: |
1572 | case elfcpp::R_X86_64_GOTPCREL: | |
1573 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1574 | { |
1575 | // The symbol requires a GOT entry. | |
1576 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1577 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1578 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1579 | else |
1580 | { | |
2e30d253 ILT |
1581 | // If this symbol is not fully resolved, we need to add a |
1582 | // dynamic relocation for it. | |
7bf1f802 | 1583 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1584 | if (gsym->is_from_dynobj() |
1585 | || gsym->is_undefined() | |
1586 | || gsym->is_preemptible()) | |
0a65a3a7 | 1587 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1588 | elfcpp::R_X86_64_GLOB_DAT); |
1589 | else | |
2e30d253 | 1590 | { |
0a65a3a7 CC |
1591 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1592 | rela_dyn->add_global_relative( | |
1593 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1594 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1595 | } |
1596 | } | |
ee9e9e86 ILT |
1597 | // For GOTPLT64, we also need a PLT entry (but only if the |
1598 | // symbol is not fully resolved). | |
1599 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1600 | && !gsym->final_value_is_known()) | |
1601 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1602 | } |
1603 | break; | |
1604 | ||
1605 | case elfcpp::R_X86_64_PLT32: | |
1606 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1607 | // Otherwise we need a PLT entry. | |
1608 | if (gsym->final_value_is_known()) | |
1609 | break; | |
96f2030e ILT |
1610 | // If building a shared library, we can also skip the PLT entry |
1611 | // if the symbol is defined in the output file and is protected | |
1612 | // or hidden. | |
1613 | if (gsym->is_defined() | |
1614 | && !gsym->is_from_dynobj() | |
1615 | && !gsym->is_preemptible()) | |
1616 | break; | |
2e30d253 ILT |
1617 | target->make_plt_entry(symtab, layout, gsym); |
1618 | break; | |
1619 | ||
fdc2f80f | 1620 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1621 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1622 | case elfcpp::R_X86_64_GOTPC64: |
1623 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1624 | // We need a GOT section. |
1625 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1626 | // For PLTOFF64, we also need a PLT entry (but only if the |
1627 | // symbol is not fully resolved). | |
1628 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1629 | && !gsym->final_value_is_known()) | |
1630 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1631 | break; |
1632 | ||
2e30d253 ILT |
1633 | case elfcpp::R_X86_64_COPY: |
1634 | case elfcpp::R_X86_64_GLOB_DAT: | |
1635 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1636 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1637 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1638 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1639 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1640 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1641 | gold_error(_("%s: unexpected reloc %u in object file"), |
1642 | object->name().c_str(), r_type); | |
2e30d253 | 1643 | break; |
2e30d253 | 1644 | |
d61c17ea | 1645 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1646 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1647 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1648 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1649 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1650 | case elfcpp::R_X86_64_DTPOFF32: |
1651 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1652 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1653 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1654 | { |
1655 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1656 | const tls::Tls_optimization optimized_type |
1657 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1658 | switch (r_type) |
1659 | { | |
56622147 | 1660 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1661 | if (optimized_type == tls::TLSOPT_NONE) |
1662 | { | |
1663 | // Create a pair of GOT entries for the module index and | |
1664 | // dtv-relative offset. | |
1665 | Output_data_got<64, false>* got | |
1666 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1667 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1668 | target->rela_dyn_section(layout), | |
1669 | elfcpp::R_X86_64_DTPMOD64, | |
1670 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1671 | } |
1672 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1673 | { | |
1674 | // Create a GOT entry for the tp-relative offset. | |
1675 | Output_data_got<64, false>* got | |
1676 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1677 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1678 | target->rela_dyn_section(layout), |
1679 | elfcpp::R_X86_64_TPOFF64); | |
1680 | } | |
1681 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1682 | unsupported_reloc_global(object, r_type, gsym); | |
1683 | break; | |
1684 | ||
56622147 | 1685 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1686 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1687 | if (optimized_type == tls::TLSOPT_NONE) |
1688 | { | |
1689 | // Create reserved PLT and GOT entries for the resolver. | |
1690 | target->reserve_tlsdesc_entries(symtab, layout); | |
1691 | ||
1692 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1693 | Output_data_got<64, false>* got | |
1694 | = target->got_section(symtab, layout); | |
e291e7b9 ILT |
1695 | Reloc_section *rt = target->rela_tlsdesc_section(layout); |
1696 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, rt, | |
c2b45e22 CC |
1697 | elfcpp::R_X86_64_TLSDESC, 0); |
1698 | } | |
1699 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1700 | { | |
1701 | // Create a GOT entry for the tp-relative offset. | |
1702 | Output_data_got<64, false>* got | |
1703 | = target->got_section(symtab, layout); | |
1704 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1705 | target->rela_dyn_section(layout), | |
1706 | elfcpp::R_X86_64_TPOFF64); | |
1707 | } | |
1708 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1709 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1710 | break; |
1711 | ||
c2b45e22 CC |
1712 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1713 | break; | |
1714 | ||
e041f13d | 1715 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1716 | if (optimized_type == tls::TLSOPT_NONE) |
1717 | { | |
1718 | // Create a GOT entry for the module index. | |
31d60480 | 1719 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1720 | } |
1721 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1722 | unsupported_reloc_global(object, r_type, gsym); | |
1723 | break; | |
1724 | ||
0ffd9845 ILT |
1725 | case elfcpp::R_X86_64_DTPOFF32: |
1726 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1727 | break; |
1728 | ||
56622147 | 1729 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1730 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1731 | if (optimized_type == tls::TLSOPT_NONE) |
1732 | { | |
1733 | // Create a GOT entry for the tp-relative offset. | |
1734 | Output_data_got<64, false>* got | |
1735 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1736 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1737 | target->rela_dyn_section(layout), |
1738 | elfcpp::R_X86_64_TPOFF64); | |
1739 | } | |
1740 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1741 | unsupported_reloc_global(object, r_type, gsym); |
1742 | break; | |
0ffd9845 | 1743 | |
56622147 | 1744 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1745 | layout->set_has_static_tls(); |
8851ecca | 1746 | if (parameters->options().shared()) |
7bf1f802 | 1747 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1748 | break; |
e041f13d ILT |
1749 | |
1750 | default: | |
1751 | gold_unreachable(); | |
2e30d253 ILT |
1752 | } |
1753 | } | |
1754 | break; | |
fdc2f80f ILT |
1755 | |
1756 | case elfcpp::R_X86_64_SIZE32: | |
1757 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1758 | default: |
75f2446e | 1759 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1760 | object->name().c_str(), r_type, |
1761 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1762 | break; |
1763 | } | |
1764 | } | |
1765 | ||
6d03d481 | 1766 | void |
ad0f2072 | 1767 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1768 | Layout* layout, |
1769 | Sized_relobj<64, false>* object, | |
1770 | unsigned int data_shndx, | |
1771 | unsigned int sh_type, | |
1772 | const unsigned char* prelocs, | |
1773 | size_t reloc_count, | |
1774 | Output_section* output_section, | |
1775 | bool needs_special_offset_handling, | |
1776 | size_t local_symbol_count, | |
1777 | const unsigned char* plocal_symbols) | |
1778 | { | |
1779 | ||
1780 | if (sh_type == elfcpp::SHT_REL) | |
1781 | { | |
1782 | return; | |
1783 | } | |
1784 | ||
1785 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1786 | Target_x86_64::Scan>( | |
6d03d481 ST |
1787 | symtab, |
1788 | layout, | |
1789 | this, | |
1790 | object, | |
1791 | data_shndx, | |
1792 | prelocs, | |
1793 | reloc_count, | |
1794 | output_section, | |
1795 | needs_special_offset_handling, | |
1796 | local_symbol_count, | |
1797 | plocal_symbols); | |
1798 | ||
1799 | } | |
2e30d253 ILT |
1800 | // Scan relocations for a section. |
1801 | ||
1802 | void | |
ad0f2072 | 1803 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
1804 | Layout* layout, |
1805 | Sized_relobj<64, false>* object, | |
1806 | unsigned int data_shndx, | |
1807 | unsigned int sh_type, | |
1808 | const unsigned char* prelocs, | |
1809 | size_t reloc_count, | |
730cdc88 ILT |
1810 | Output_section* output_section, |
1811 | bool needs_special_offset_handling, | |
d61c17ea | 1812 | size_t local_symbol_count, |
730cdc88 | 1813 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1814 | { |
1815 | if (sh_type == elfcpp::SHT_REL) | |
1816 | { | |
75f2446e ILT |
1817 | gold_error(_("%s: unsupported REL reloc section"), |
1818 | object->name().c_str()); | |
1819 | return; | |
2e30d253 ILT |
1820 | } |
1821 | ||
1822 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1823 | Target_x86_64::Scan>( | |
2e30d253 ILT |
1824 | symtab, |
1825 | layout, | |
1826 | this, | |
1827 | object, | |
1828 | data_shndx, | |
1829 | prelocs, | |
1830 | reloc_count, | |
730cdc88 ILT |
1831 | output_section, |
1832 | needs_special_offset_handling, | |
2e30d253 | 1833 | local_symbol_count, |
730cdc88 | 1834 | plocal_symbols); |
2e30d253 ILT |
1835 | } |
1836 | ||
1837 | // Finalize the sections. | |
1838 | ||
1839 | void | |
f59f41f3 DK |
1840 | Target_x86_64::do_finalize_sections( |
1841 | Layout* layout, | |
1842 | const Input_objects*, | |
e785ec03 | 1843 | Symbol_table* symtab) |
2e30d253 | 1844 | { |
ea715a34 ILT |
1845 | const Reloc_section* rel_plt = (this->plt_ == NULL |
1846 | ? NULL | |
e291e7b9 | 1847 | : this->plt_->rela_plt()); |
ea715a34 | 1848 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 1849 | this->rela_dyn_, true, false); |
ea715a34 | 1850 | |
2e30d253 ILT |
1851 | // Fill in some more dynamic tags. |
1852 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1853 | if (odyn != NULL) | |
1854 | { | |
22b127cc | 1855 | if (this->plt_ != NULL |
ea715a34 ILT |
1856 | && this->plt_->output_section() != NULL |
1857 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 1858 | { |
ea715a34 ILT |
1859 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
1860 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1861 | this->got_->finalize_data_size(); | |
1862 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1863 | this->plt_, plt_offset); | |
1864 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1865 | this->got_, got_offset); | |
2e30d253 ILT |
1866 | } |
1867 | } | |
1868 | ||
1869 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1870 | // relocs. | |
12c0daef ILT |
1871 | if (this->copy_relocs_.any_saved_relocs()) |
1872 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
1873 | |
1874 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
1875 | // the .got.plt section. | |
1876 | Symbol* sym = this->global_offset_table_; | |
1877 | if (sym != NULL) | |
1878 | { | |
1879 | uint64_t data_size = this->got_plt_->current_data_size(); | |
1880 | symtab->get_sized_symbol<64>(sym)->set_symsize(data_size); | |
1881 | } | |
2e30d253 ILT |
1882 | } |
1883 | ||
1884 | // Perform a relocation. | |
1885 | ||
1886 | inline bool | |
1887 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1888 | Target_x86_64* target, | |
031cdbed | 1889 | Output_section*, |
2e30d253 | 1890 | size_t relnum, |
0ffd9845 | 1891 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1892 | unsigned int r_type, |
1893 | const Sized_symbol<64>* gsym, | |
1894 | const Symbol_value<64>* psymval, | |
1895 | unsigned char* view, | |
1896 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1897 | section_size_type view_size) |
2e30d253 ILT |
1898 | { |
1899 | if (this->skip_call_tls_get_addr_) | |
1900 | { | |
5efc7cd2 CC |
1901 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1902 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1903 | || gsym == NULL |
0ffd9845 | 1904 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1905 | { |
75f2446e ILT |
1906 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1907 | _("missing expected TLS relocation")); | |
1908 | } | |
1909 | else | |
1910 | { | |
1911 | this->skip_call_tls_get_addr_ = false; | |
1912 | return false; | |
2e30d253 | 1913 | } |
2e30d253 ILT |
1914 | } |
1915 | ||
1916 | // Pick the value to use for symbols defined in shared objects. | |
1917 | Symbol_value<64> symval; | |
96f2030e | 1918 | if (gsym != NULL |
de4c45bd ILT |
1919 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1920 | || r_type == elfcpp::R_X86_64_PC32 | |
1921 | || r_type == elfcpp::R_X86_64_PC16 | |
1922 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1923 | { |
1924 | symval.set_output_value(target->plt_section()->address() | |
1925 | + gsym->plt_offset()); | |
1926 | psymval = &symval; | |
1927 | } | |
1928 | ||
1929 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1930 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1931 | ||
1932 | // Get the GOT offset if needed. | |
96f2030e ILT |
1933 | // The GOT pointer points to the end of the GOT section. |
1934 | // We need to subtract the size of the GOT section to get | |
1935 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1936 | bool have_got_offset = false; |
1937 | unsigned int got_offset = 0; | |
1938 | switch (r_type) | |
1939 | { | |
1940 | case elfcpp::R_X86_64_GOT32: | |
1941 | case elfcpp::R_X86_64_GOT64: | |
1942 | case elfcpp::R_X86_64_GOTPLT64: | |
1943 | case elfcpp::R_X86_64_GOTPCREL: | |
1944 | case elfcpp::R_X86_64_GOTPCREL64: | |
1945 | if (gsym != NULL) | |
1946 | { | |
0a65a3a7 CC |
1947 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1948 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1949 | } |
1950 | else | |
1951 | { | |
1952 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1953 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1954 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1955 | - target->got_size()); | |
0ffd9845 ILT |
1956 | } |
1957 | have_got_offset = true; | |
1958 | break; | |
1959 | ||
1960 | default: | |
1961 | break; | |
1962 | } | |
2e30d253 ILT |
1963 | |
1964 | switch (r_type) | |
1965 | { | |
1966 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1967 | case elfcpp::R_386_GNU_VTINHERIT: |
1968 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1969 | break; |
1970 | ||
1971 | case elfcpp::R_X86_64_64: | |
1972 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1973 | break; | |
1974 | ||
1975 | case elfcpp::R_X86_64_PC64: | |
1976 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1977 | address); | |
1978 | break; | |
1979 | ||
1980 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1981 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1982 | // uint64_t x = value + addend; | |
1983 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1984 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1985 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1986 | break; | |
1987 | ||
1988 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1989 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1990 | // int64_t x = value + addend; // note this quantity is signed! | |
1991 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1992 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1993 | break; | |
1994 | ||
1995 | case elfcpp::R_X86_64_PC32: | |
1996 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1997 | address); | |
1998 | break; | |
1999 | ||
2000 | case elfcpp::R_X86_64_16: | |
2001 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
2002 | break; | |
2003 | ||
2004 | case elfcpp::R_X86_64_PC16: | |
2005 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
2006 | address); | |
2007 | break; | |
2008 | ||
2009 | case elfcpp::R_X86_64_8: | |
2010 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
2011 | break; | |
2012 | ||
2013 | case elfcpp::R_X86_64_PC8: | |
2014 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
2015 | address); | |
2016 | break; | |
2017 | ||
2018 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
2019 | gold_assert(gsym == NULL |
2020 | || gsym->has_plt_offset() | |
99f8faca ILT |
2021 | || gsym->final_value_is_known() |
2022 | || (gsym->is_defined() | |
2023 | && !gsym->is_from_dynobj() | |
2024 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
2025 | // Note: while this code looks the same as for R_X86_64_PC32, it |
2026 | // behaves differently because psymval was set to point to | |
2027 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
2028 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
2029 | address); | |
2030 | break; | |
2031 | ||
ee9e9e86 ILT |
2032 | case elfcpp::R_X86_64_PLTOFF64: |
2033 | { | |
2034 | gold_assert(gsym); | |
2035 | gold_assert(gsym->has_plt_offset() | |
2036 | || gsym->final_value_is_known()); | |
2037 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
2038 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
2039 | Relocate_functions<64, false>::rela64(view, object, psymval, |
2040 | addend - got_address); | |
ee9e9e86 ILT |
2041 | } |
2042 | ||
2e30d253 | 2043 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
2044 | gold_assert(have_got_offset); |
2045 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
2046 | break; |
2047 | ||
e822f2b1 ILT |
2048 | case elfcpp::R_X86_64_GOTPC32: |
2049 | { | |
2050 | gold_assert(gsym); | |
2051 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2052 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2053 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2054 | } | |
2055 | break; | |
2056 | ||
2057 | case elfcpp::R_X86_64_GOT64: | |
2058 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
2059 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 2060 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2061 | gold_assert(have_got_offset); |
2062 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
2063 | break; |
2064 | ||
2065 | case elfcpp::R_X86_64_GOTPC64: | |
2066 | { | |
2067 | gold_assert(gsym); | |
2068 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2069 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2070 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
2071 | } | |
2072 | break; | |
2073 | ||
2e30d253 ILT |
2074 | case elfcpp::R_X86_64_GOTOFF64: |
2075 | { | |
2076 | elfcpp::Elf_types<64>::Elf_Addr value; | |
2077 | value = (psymval->value(object, 0) | |
96f2030e | 2078 | - target->got_plt_section()->address()); |
2e30d253 ILT |
2079 | Relocate_functions<64, false>::rela64(view, value, addend); |
2080 | } | |
2081 | break; | |
2082 | ||
2083 | case elfcpp::R_X86_64_GOTPCREL: | |
2084 | { | |
0ffd9845 ILT |
2085 | gold_assert(have_got_offset); |
2086 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2087 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2088 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
2089 | } |
2090 | break; | |
2091 | ||
e822f2b1 ILT |
2092 | case elfcpp::R_X86_64_GOTPCREL64: |
2093 | { | |
0ffd9845 ILT |
2094 | gold_assert(have_got_offset); |
2095 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2096 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2097 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
2098 | } |
2099 | break; | |
2100 | ||
2e30d253 ILT |
2101 | case elfcpp::R_X86_64_COPY: |
2102 | case elfcpp::R_X86_64_GLOB_DAT: | |
2103 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2104 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 2105 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2106 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2107 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2108 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2109 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2110 | _("unexpected reloc %u in object file"), | |
2111 | r_type); | |
2e30d253 ILT |
2112 | break; |
2113 | ||
d61c17ea | 2114 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2115 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2116 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2117 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2118 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2119 | case elfcpp::R_X86_64_DTPOFF32: |
2120 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2121 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2122 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
2123 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2124 | view, address, view_size); | |
2e30d253 | 2125 | break; |
2e30d253 | 2126 | |
fdc2f80f ILT |
2127 | case elfcpp::R_X86_64_SIZE32: |
2128 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2129 | default: |
75f2446e ILT |
2130 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2131 | _("unsupported reloc %u"), | |
2132 | r_type); | |
2e30d253 ILT |
2133 | break; |
2134 | } | |
2135 | ||
2136 | return true; | |
2137 | } | |
2138 | ||
2139 | // Perform a TLS relocation. | |
2140 | ||
2141 | inline void | |
d61c17ea | 2142 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 2143 | Target_x86_64* target, |
d61c17ea | 2144 | size_t relnum, |
72ec2876 | 2145 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2146 | unsigned int r_type, |
2147 | const Sized_symbol<64>* gsym, | |
2148 | const Symbol_value<64>* psymval, | |
2149 | unsigned char* view, | |
6a41d30b | 2150 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2151 | section_size_type view_size) |
2e30d253 | 2152 | { |
2e30d253 | 2153 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
2154 | |
2155 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 2156 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
2157 | |
2158 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
2159 | ||
2160 | const bool is_final = (gsym == NULL | |
b3705d2a | 2161 | ? !parameters->options().shared() |
2e30d253 | 2162 | : gsym->final_value_is_known()); |
e041f13d ILT |
2163 | const tls::Tls_optimization optimized_type |
2164 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
2165 | switch (r_type) |
2166 | { | |
56622147 | 2167 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 2168 | this->saw_tls_block_reloc_ = true; |
e041f13d | 2169 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 2170 | { |
7bf1f802 | 2171 | gold_assert(tls_segment != NULL); |
2e30d253 | 2172 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 2173 | rela, r_type, value, view, |
2e30d253 ILT |
2174 | view_size); |
2175 | break; | |
2176 | } | |
7bf1f802 ILT |
2177 | else |
2178 | { | |
c2b45e22 CC |
2179 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2180 | ? GOT_TYPE_TLS_OFFSET | |
2181 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2182 | unsigned int got_offset; |
2183 | if (gsym != NULL) | |
2184 | { | |
c2b45e22 CC |
2185 | gold_assert(gsym->has_got_offset(got_type)); |
2186 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2187 | } |
2188 | else | |
2189 | { | |
2190 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2191 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2192 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2193 | - target->got_size()); |
2194 | } | |
2195 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2196 | { | |
2197 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2198 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2199 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2200 | value, view, address, view_size); |
7bf1f802 ILT |
2201 | break; |
2202 | } | |
2203 | else if (optimized_type == tls::TLSOPT_NONE) | |
2204 | { | |
2205 | // Relocate the field with the offset of the pair of GOT | |
2206 | // entries. | |
6a41d30b ILT |
2207 | value = target->got_plt_section()->address() + got_offset; |
2208 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2209 | address); | |
7bf1f802 ILT |
2210 | break; |
2211 | } | |
2212 | } | |
72ec2876 | 2213 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2214 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2215 | break; |
2216 | ||
c2b45e22 CC |
2217 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2218 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2219 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2220 | if (optimized_type == tls::TLSOPT_TO_LE) |
2221 | { | |
2222 | gold_assert(tls_segment != NULL); | |
2223 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2224 | rela, r_type, value, view, | |
2225 | view_size); | |
2226 | break; | |
2227 | } | |
2228 | else | |
2229 | { | |
2230 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2231 | ? GOT_TYPE_TLS_OFFSET | |
2232 | : GOT_TYPE_TLS_DESC); | |
2233 | unsigned int got_offset; | |
2234 | if (gsym != NULL) | |
2235 | { | |
2236 | gold_assert(gsym->has_got_offset(got_type)); | |
2237 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2238 | } | |
2239 | else | |
2240 | { | |
2241 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2242 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2243 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2244 | - target->got_size()); | |
2245 | } | |
2246 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2247 | { | |
2248 | gold_assert(tls_segment != NULL); | |
2249 | value = target->got_plt_section()->address() + got_offset; | |
2250 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2251 | rela, r_type, value, view, address, | |
2252 | view_size); | |
2253 | break; | |
2254 | } | |
2255 | else if (optimized_type == tls::TLSOPT_NONE) | |
2256 | { | |
2257 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2258 | { | |
2259 | // Relocate the field with the offset of the pair of GOT | |
2260 | // entries. | |
2261 | value = target->got_plt_section()->address() + got_offset; | |
2262 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2263 | address); | |
2264 | } | |
2265 | break; | |
2266 | } | |
2267 | } | |
2268 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2269 | _("unsupported reloc %u"), r_type); | |
2270 | break; | |
2271 | ||
56622147 | 2272 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2273 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2274 | if (optimized_type == tls::TLSOPT_TO_LE) |
2275 | { | |
7bf1f802 | 2276 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2277 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2278 | value, view, view_size); | |
2279 | break; | |
e041f13d | 2280 | } |
7bf1f802 ILT |
2281 | else if (optimized_type == tls::TLSOPT_NONE) |
2282 | { | |
2283 | // Relocate the field with the offset of the GOT entry for | |
2284 | // the module index. | |
2285 | unsigned int got_offset; | |
31d60480 ILT |
2286 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2287 | - target->got_size()); | |
6a41d30b ILT |
2288 | value = target->got_plt_section()->address() + got_offset; |
2289 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2290 | address); | |
7bf1f802 ILT |
2291 | break; |
2292 | } | |
72ec2876 | 2293 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2294 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2295 | break; |
0ffd9845 ILT |
2296 | |
2297 | case elfcpp::R_X86_64_DTPOFF32: | |
e041f13d | 2298 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2299 | { |
2300 | // This relocation type is used in debugging information. | |
2301 | // In that case we need to not optimize the value. If we | |
2302 | // haven't seen a TLSLD reloc, then we assume we should not | |
2303 | // optimize this reloc. | |
2304 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2305 | { |
2306 | gold_assert(tls_segment != NULL); | |
2307 | value -= tls_segment->memsz(); | |
2308 | } | |
497897f9 | 2309 | } |
d85c80a3 | 2310 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2311 | break; |
2312 | ||
2313 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d | 2314 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2315 | { |
2316 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2317 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2318 | { |
2319 | gold_assert(tls_segment != NULL); | |
2320 | value -= tls_segment->memsz(); | |
2321 | } | |
497897f9 | 2322 | } |
d85c80a3 | 2323 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2324 | break; |
2e30d253 | 2325 | |
56622147 ILT |
2326 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2327 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2328 | { | |
7bf1f802 | 2329 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2330 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2331 | rela, r_type, value, view, | |
2332 | view_size); | |
2333 | break; | |
2334 | } | |
7bf1f802 ILT |
2335 | else if (optimized_type == tls::TLSOPT_NONE) |
2336 | { | |
2337 | // Relocate the field with the offset of the GOT entry for | |
2338 | // the tp-relative offset of the symbol. | |
2339 | unsigned int got_offset; | |
2340 | if (gsym != NULL) | |
2341 | { | |
0a65a3a7 CC |
2342 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2343 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2344 | - target->got_size()); | |
7bf1f802 ILT |
2345 | } |
2346 | else | |
2347 | { | |
2348 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2349 | gold_assert(object->local_has_got_offset(r_sym, |
2350 | GOT_TYPE_TLS_OFFSET)); | |
2351 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2352 | - target->got_size()); |
2353 | } | |
6a41d30b ILT |
2354 | value = target->got_plt_section()->address() + got_offset; |
2355 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2356 | break; |
2357 | } | |
56622147 ILT |
2358 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2359 | _("unsupported reloc type %u"), | |
2360 | r_type); | |
2361 | break; | |
0ffd9845 | 2362 | |
56622147 | 2363 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2364 | value -= tls_segment->memsz(); |
d85c80a3 | 2365 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2366 | break; |
2e30d253 | 2367 | } |
2e30d253 ILT |
2368 | } |
2369 | ||
7bf1f802 ILT |
2370 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2371 | // Initial-Exec. | |
2372 | ||
2373 | inline void | |
2374 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2375 | size_t relnum, | |
c2b45e22 | 2376 | Output_segment*, |
7bf1f802 ILT |
2377 | const elfcpp::Rela<64, false>& rela, |
2378 | unsigned int, | |
2379 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2380 | unsigned char* view, | |
c2b45e22 | 2381 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2382 | section_size_type view_size) |
7bf1f802 ILT |
2383 | { |
2384 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2385 | // .word 0x6666; rex64; call __tls_get_addr | |
2386 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2387 | ||
2388 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2389 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2390 | ||
2391 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2392 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2393 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2394 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2395 | ||
2396 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2397 | ||
c2b45e22 CC |
2398 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2399 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2400 | |
2401 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2402 | // We can skip it. | |
2403 | this->skip_call_tls_get_addr_ = true; | |
2404 | } | |
2405 | ||
e041f13d | 2406 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2407 | // Local-Exec. |
2408 | ||
2409 | inline void | |
d61c17ea ILT |
2410 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2411 | size_t relnum, | |
2412 | Output_segment* tls_segment, | |
72ec2876 | 2413 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2414 | unsigned int, |
2415 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2416 | unsigned char* view, | |
fe8718a4 | 2417 | section_size_type view_size) |
2e30d253 | 2418 | { |
0ffd9845 ILT |
2419 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2420 | // .word 0x6666; rex64; call __tls_get_addr | |
2421 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2422 | |
72ec2876 ILT |
2423 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2424 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2425 | |
72ec2876 ILT |
2426 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2427 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2428 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2429 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2430 | |
0ffd9845 | 2431 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2432 | |
6a41d30b | 2433 | value -= tls_segment->memsz(); |
0ffd9845 | 2434 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2435 | |
2436 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2437 | // We can skip it. | |
2438 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2439 | } |
2440 | ||
c2b45e22 CC |
2441 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2442 | ||
2443 | inline void | |
2444 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2445 | const Relocate_info<64, false>* relinfo, | |
2446 | size_t relnum, | |
2447 | Output_segment*, | |
2448 | const elfcpp::Rela<64, false>& rela, | |
2449 | unsigned int r_type, | |
2450 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2451 | unsigned char* view, | |
2452 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2453 | section_size_type view_size) | |
2454 | { | |
2455 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2456 | { | |
2457 | // leaq foo@tlsdesc(%rip), %rax | |
2458 | // ==> movq foo@gottpoff(%rip), %rax | |
2459 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2460 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2461 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2462 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2463 | view[-2] = 0x8b; | |
2464 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2465 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2466 | } | |
2467 | else | |
2468 | { | |
2469 | // call *foo@tlscall(%rax) | |
2470 | // ==> nop; nop | |
2471 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2472 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2473 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2474 | view[0] == 0xff && view[1] == 0x10); | |
2475 | view[0] = 0x66; | |
2476 | view[1] = 0x90; | |
2477 | } | |
2478 | } | |
2479 | ||
2480 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2481 | ||
2482 | inline void | |
2483 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2484 | const Relocate_info<64, false>* relinfo, | |
2485 | size_t relnum, | |
2486 | Output_segment* tls_segment, | |
2487 | const elfcpp::Rela<64, false>& rela, | |
2488 | unsigned int r_type, | |
2489 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2490 | unsigned char* view, | |
2491 | section_size_type view_size) | |
2492 | { | |
2493 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2494 | { | |
2495 | // leaq foo@tlsdesc(%rip), %rax | |
2496 | // ==> movq foo@tpoff, %rax | |
2497 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2498 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2499 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2500 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2501 | view[-2] = 0xc7; | |
2502 | view[-1] = 0xc0; | |
2503 | value -= tls_segment->memsz(); | |
2504 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2505 | } | |
2506 | else | |
2507 | { | |
2508 | // call *foo@tlscall(%rax) | |
2509 | // ==> nop; nop | |
2510 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2511 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2512 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2513 | view[0] == 0xff && view[1] == 0x10); | |
2514 | view[0] = 0x66; | |
2515 | view[1] = 0x90; | |
2516 | } | |
2517 | } | |
2518 | ||
2e30d253 | 2519 | inline void |
72ec2876 ILT |
2520 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2521 | size_t relnum, | |
2522 | Output_segment*, | |
2523 | const elfcpp::Rela<64, false>& rela, | |
2524 | unsigned int, | |
2525 | elfcpp::Elf_types<64>::Elf_Addr, | |
2526 | unsigned char* view, | |
fe8718a4 | 2527 | section_size_type view_size) |
2e30d253 | 2528 | { |
72ec2876 ILT |
2529 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2530 | // ... leq foo@dtpoff(%rax),%reg | |
2531 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2532 | |
72ec2876 ILT |
2533 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2534 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2535 | |
72ec2876 ILT |
2536 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2537 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2538 | ||
2539 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2540 | ||
2541 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2542 | ||
2543 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2544 | // We can skip it. | |
2545 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2546 | } |
2547 | ||
56622147 ILT |
2548 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2549 | // Local-Exec. | |
2550 | ||
2551 | inline void | |
2552 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2553 | size_t relnum, | |
2554 | Output_segment* tls_segment, | |
2555 | const elfcpp::Rela<64, false>& rela, | |
2556 | unsigned int, | |
2557 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2558 | unsigned char* view, | |
fe8718a4 | 2559 | section_size_type view_size) |
56622147 ILT |
2560 | { |
2561 | // We need to examine the opcodes to figure out which instruction we | |
2562 | // are looking at. | |
2563 | ||
2564 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2565 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2566 | ||
2567 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2568 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2569 | ||
2570 | unsigned char op1 = view[-3]; | |
2571 | unsigned char op2 = view[-2]; | |
2572 | unsigned char op3 = view[-1]; | |
2573 | unsigned char reg = op3 >> 3; | |
2574 | ||
2575 | if (op2 == 0x8b) | |
2576 | { | |
2577 | // movq | |
2578 | if (op1 == 0x4c) | |
2579 | view[-3] = 0x49; | |
2580 | view[-2] = 0xc7; | |
2581 | view[-1] = 0xc0 | reg; | |
2582 | } | |
2583 | else if (reg == 4) | |
2584 | { | |
2585 | // Special handling for %rsp. | |
2586 | if (op1 == 0x4c) | |
2587 | view[-3] = 0x49; | |
2588 | view[-2] = 0x81; | |
2589 | view[-1] = 0xc0 | reg; | |
2590 | } | |
2591 | else | |
2592 | { | |
2593 | // addq | |
2594 | if (op1 == 0x4c) | |
2595 | view[-3] = 0x4d; | |
2596 | view[-2] = 0x8d; | |
2597 | view[-1] = 0x80 | reg | (reg << 3); | |
2598 | } | |
2599 | ||
6a41d30b | 2600 | value -= tls_segment->memsz(); |
56622147 ILT |
2601 | Relocate_functions<64, false>::rela32(view, value, 0); |
2602 | } | |
2603 | ||
2e30d253 ILT |
2604 | // Relocate section data. |
2605 | ||
2606 | void | |
364c7fa5 ILT |
2607 | Target_x86_64::relocate_section( |
2608 | const Relocate_info<64, false>* relinfo, | |
2609 | unsigned int sh_type, | |
2610 | const unsigned char* prelocs, | |
2611 | size_t reloc_count, | |
2612 | Output_section* output_section, | |
2613 | bool needs_special_offset_handling, | |
2614 | unsigned char* view, | |
2615 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2616 | section_size_type view_size, | |
2617 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2618 | { |
2619 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2620 | ||
2621 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2622 | Target_x86_64::Relocate>( | |
2623 | relinfo, | |
2624 | this, | |
2625 | prelocs, | |
2626 | reloc_count, | |
730cdc88 ILT |
2627 | output_section, |
2628 | needs_special_offset_handling, | |
2e30d253 ILT |
2629 | view, |
2630 | address, | |
364c7fa5 ILT |
2631 | view_size, |
2632 | reloc_symbol_changes); | |
2e30d253 ILT |
2633 | } |
2634 | ||
6a74a719 ILT |
2635 | // Return the size of a relocation while scanning during a relocatable |
2636 | // link. | |
2637 | ||
2638 | unsigned int | |
2639 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2640 | unsigned int r_type, | |
2641 | Relobj* object) | |
2642 | { | |
2643 | switch (r_type) | |
2644 | { | |
2645 | case elfcpp::R_X86_64_NONE: | |
2646 | case elfcpp::R_386_GNU_VTINHERIT: | |
2647 | case elfcpp::R_386_GNU_VTENTRY: | |
2648 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2649 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2650 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2651 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2652 | case elfcpp::R_X86_64_DTPOFF32: | |
2653 | case elfcpp::R_X86_64_DTPOFF64: | |
2654 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2655 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2656 | return 0; | |
2657 | ||
2658 | case elfcpp::R_X86_64_64: | |
2659 | case elfcpp::R_X86_64_PC64: | |
2660 | case elfcpp::R_X86_64_GOTOFF64: | |
2661 | case elfcpp::R_X86_64_GOTPC64: | |
2662 | case elfcpp::R_X86_64_PLTOFF64: | |
2663 | case elfcpp::R_X86_64_GOT64: | |
2664 | case elfcpp::R_X86_64_GOTPCREL64: | |
2665 | case elfcpp::R_X86_64_GOTPCREL: | |
2666 | case elfcpp::R_X86_64_GOTPLT64: | |
2667 | return 8; | |
2668 | ||
2669 | case elfcpp::R_X86_64_32: | |
2670 | case elfcpp::R_X86_64_32S: | |
2671 | case elfcpp::R_X86_64_PC32: | |
2672 | case elfcpp::R_X86_64_PLT32: | |
2673 | case elfcpp::R_X86_64_GOTPC32: | |
2674 | case elfcpp::R_X86_64_GOT32: | |
2675 | return 4; | |
2676 | ||
2677 | case elfcpp::R_X86_64_16: | |
2678 | case elfcpp::R_X86_64_PC16: | |
2679 | return 2; | |
2680 | ||
2681 | case elfcpp::R_X86_64_8: | |
2682 | case elfcpp::R_X86_64_PC8: | |
2683 | return 1; | |
2684 | ||
2685 | case elfcpp::R_X86_64_COPY: | |
2686 | case elfcpp::R_X86_64_GLOB_DAT: | |
2687 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2688 | case elfcpp::R_X86_64_RELATIVE: | |
2689 | // These are outstanding tls relocs, which are unexpected when linking | |
2690 | case elfcpp::R_X86_64_TPOFF64: | |
2691 | case elfcpp::R_X86_64_DTPMOD64: | |
2692 | case elfcpp::R_X86_64_TLSDESC: | |
2693 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2694 | return 0; | |
2695 | ||
2696 | case elfcpp::R_X86_64_SIZE32: | |
2697 | case elfcpp::R_X86_64_SIZE64: | |
2698 | default: | |
2699 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2700 | return 0; | |
2701 | } | |
2702 | } | |
2703 | ||
2704 | // Scan the relocs during a relocatable link. | |
2705 | ||
2706 | void | |
ad0f2072 | 2707 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2708 | Layout* layout, |
2709 | Sized_relobj<64, false>* object, | |
2710 | unsigned int data_shndx, | |
2711 | unsigned int sh_type, | |
2712 | const unsigned char* prelocs, | |
2713 | size_t reloc_count, | |
2714 | Output_section* output_section, | |
2715 | bool needs_special_offset_handling, | |
2716 | size_t local_symbol_count, | |
2717 | const unsigned char* plocal_symbols, | |
2718 | Relocatable_relocs* rr) | |
2719 | { | |
2720 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2721 | ||
2722 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2723 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2724 | ||
7019cd25 | 2725 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 2726 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2727 | symtab, |
2728 | layout, | |
2729 | object, | |
2730 | data_shndx, | |
2731 | prelocs, | |
2732 | reloc_count, | |
2733 | output_section, | |
2734 | needs_special_offset_handling, | |
2735 | local_symbol_count, | |
2736 | plocal_symbols, | |
2737 | rr); | |
2738 | } | |
2739 | ||
2740 | // Relocate a section during a relocatable link. | |
2741 | ||
2742 | void | |
2743 | Target_x86_64::relocate_for_relocatable( | |
2744 | const Relocate_info<64, false>* relinfo, | |
2745 | unsigned int sh_type, | |
2746 | const unsigned char* prelocs, | |
2747 | size_t reloc_count, | |
2748 | Output_section* output_section, | |
2749 | off_t offset_in_output_section, | |
2750 | const Relocatable_relocs* rr, | |
2751 | unsigned char* view, | |
2752 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2753 | section_size_type view_size, | |
2754 | unsigned char* reloc_view, | |
2755 | section_size_type reloc_view_size) | |
2756 | { | |
2757 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2758 | ||
7019cd25 | 2759 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2760 | relinfo, |
2761 | prelocs, | |
2762 | reloc_count, | |
2763 | output_section, | |
2764 | offset_in_output_section, | |
2765 | rr, | |
2766 | view, | |
2767 | view_address, | |
2768 | view_size, | |
2769 | reloc_view, | |
2770 | reloc_view_size); | |
2771 | } | |
2772 | ||
4fb6c25d ILT |
2773 | // Return the value to use for a dynamic which requires special |
2774 | // treatment. This is how we support equality comparisons of function | |
2775 | // pointers across shared library boundaries, as described in the | |
2776 | // processor specific ABI supplement. | |
2777 | ||
2778 | uint64_t | |
2779 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2780 | { | |
2781 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2782 | return this->plt_section()->address() + gsym->plt_offset(); | |
2783 | } | |
2784 | ||
2e30d253 ILT |
2785 | // Return a string used to fill a code section with nops to take up |
2786 | // the specified length. | |
2787 | ||
2788 | std::string | |
8851ecca | 2789 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2790 | { |
2791 | if (length >= 16) | |
2792 | { | |
2793 | // Build a jmpq instruction to skip over the bytes. | |
2794 | unsigned char jmp[5]; | |
2795 | jmp[0] = 0xe9; | |
04bf7072 | 2796 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2797 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2798 | + std::string(length - 5, '\0')); | |
2799 | } | |
2800 | ||
2801 | // Nop sequences of various lengths. | |
2802 | const char nop1[1] = { 0x90 }; // nop | |
2803 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2804 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2805 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2806 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2807 | 0x00 }; | |
2808 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2809 | 0x00, 0x00 }; |
1caf2c51 | 2810 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2811 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2812 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2813 | 0x00, 0x00, 0x00, 0x00 }; | |
2814 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2815 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2816 | 0x00 }; |
1caf2c51 ILT |
2817 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2818 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2819 | 0x00, 0x00 }; |
1caf2c51 ILT |
2820 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2821 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2822 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2823 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2824 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2825 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2826 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2827 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2828 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2829 | 0x00 }; |
1caf2c51 ILT |
2830 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2831 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2832 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2833 | 0x00, 0x00 }; |
1caf2c51 ILT |
2834 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2835 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2836 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2837 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2838 | |
2839 | const char* nops[16] = { | |
2840 | NULL, | |
2841 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2842 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2843 | }; | |
2844 | ||
2845 | return std::string(nops[length], length); | |
2846 | } | |
2847 | ||
e291e7b9 ILT |
2848 | // Return the addend to use for a target specific relocation. The |
2849 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
2850 | // symbol. We want to set the addend is the offset of the local | |
2851 | // symbol in the TLS segment. | |
2852 | ||
2853 | uint64_t | |
2854 | Target_x86_64::do_reloc_addend(void* arg, unsigned int r_type, | |
2855 | uint64_t) const | |
2856 | { | |
2857 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
2858 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
2859 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
2860 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
2861 | const Symbol_value<64>* psymval = ti.object->local_symbol(ti.r_sym); | |
2862 | gold_assert(psymval->is_tls_symbol()); | |
2863 | // The value of a TLS symbol is the offset in the TLS segment. | |
2864 | return psymval->value(ti.object, 0); | |
2865 | } | |
2866 | ||
364c7fa5 ILT |
2867 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2868 | // compiled with -fstack-split. The function calls non-stack-split | |
2869 | // code. We have to change the function so that it always ensures | |
2870 | // that it has enough stack space to run some random function. | |
2871 | ||
2872 | void | |
2873 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2874 | section_offset_type fnoffset, | |
2875 | section_size_type fnsize, | |
2876 | unsigned char* view, | |
2877 | section_size_type view_size, | |
2878 | std::string* from, | |
2879 | std::string* to) const | |
2880 | { | |
2881 | // The function starts with a comparison of the stack pointer and a | |
2882 | // field in the TCB. This is followed by a jump. | |
2883 | ||
2884 | // cmp %fs:NN,%rsp | |
2885 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
2886 | && fnsize > 9) | |
2887 | { | |
2888 | // We will call __morestack if the carry flag is set after this | |
2889 | // comparison. We turn the comparison into an stc instruction | |
2890 | // and some nops. | |
2891 | view[fnoffset] = '\xf9'; | |
2892 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
2893 | } | |
2894 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
2895 | // lea NN(%rsp),%r11 |
2896 | else if ((this->match_view(view, view_size, fnoffset, | |
2897 | "\x4c\x8d\x94\x24", 4) | |
2898 | || this->match_view(view, view_size, fnoffset, | |
2899 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
2900 | && fnsize > 8) |
2901 | { | |
2902 | // This is loading an offset from the stack pointer for a | |
2903 | // comparison. The offset is negative, so we decrease the | |
2904 | // offset by the amount of space we need for the stack. This | |
2905 | // means we will avoid calling __morestack if there happens to | |
2906 | // be plenty of space on the stack already. | |
2907 | unsigned char* pval = view + fnoffset + 4; | |
2908 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2909 | val -= parameters->options().split_stack_adjust_size(); | |
2910 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2911 | } | |
2912 | else | |
2913 | { | |
2914 | if (!object->has_no_split_stack()) | |
2915 | object->error(_("failed to match split-stack sequence at " | |
2916 | "section %u offset %0zx"), | |
ac33a407 | 2917 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2918 | return; |
2919 | } | |
2920 | ||
2921 | // We have to change the function so that it calls | |
2922 | // __morestack_non_split instead of __morestack. The former will | |
2923 | // allocate additional stack space. | |
2924 | *from = "__morestack"; | |
2925 | *to = "__morestack_non_split"; | |
2926 | } | |
2927 | ||
2e30d253 ILT |
2928 | // The selector for x86_64 object files. |
2929 | ||
36959681 | 2930 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
2931 | { |
2932 | public: | |
2933 | Target_selector_x86_64() | |
36959681 ILT |
2934 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
2935 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
2936 | { } |
2937 | ||
2938 | Target* | |
e96caa79 ILT |
2939 | do_instantiate_target() |
2940 | { return new Target_x86_64(); } | |
36959681 | 2941 | |
2e30d253 ILT |
2942 | }; |
2943 | ||
2e30d253 ILT |
2944 | Target_selector_x86_64 target_selector_x86_64; |
2945 | ||
2946 | } // End anonymous namespace. |