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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" |
2e30d253 ILT |
42 | |
43 | namespace | |
44 | { | |
45 | ||
46 | using namespace gold; | |
47 | ||
48 | class Output_data_plt_x86_64; | |
49 | ||
50 | // The x86_64 target class. | |
d61c17ea ILT |
51 | // See the ABI at |
52 | // http://www.x86-64.org/documentation/abi.pdf | |
53 | // TLS info comes from | |
54 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 55 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 56 | |
36959681 | 57 | class Target_x86_64 : public Target_freebsd<64, false> |
2e30d253 ILT |
58 | { |
59 | public: | |
e822f2b1 ILT |
60 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
61 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
62 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
63 | ||
64 | Target_x86_64() | |
36959681 | 65 | : Target_freebsd<64, false>(&x86_64_info), |
0ffd9845 | 66 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
12c0daef | 67 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), |
edfbb029 | 68 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
2e30d253 ILT |
69 | { } |
70 | ||
8a5e3e08 ILT |
71 | // Hook for a new output section. |
72 | void | |
73 | do_new_output_section(Output_section*) const; | |
74 | ||
6d03d481 ST |
75 | // Scan the relocations to look for symbol adjustments. |
76 | void | |
ad0f2072 | 77 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
78 | Layout* layout, |
79 | Sized_relobj<64, false>* object, | |
80 | unsigned int data_shndx, | |
81 | unsigned int sh_type, | |
82 | const unsigned char* prelocs, | |
83 | size_t reloc_count, | |
84 | Output_section* output_section, | |
85 | bool needs_special_offset_handling, | |
86 | size_t local_symbol_count, | |
87 | const unsigned char* plocal_symbols); | |
88 | ||
2e30d253 ILT |
89 | // Scan the relocations to look for symbol adjustments. |
90 | void | |
ad0f2072 | 91 | scan_relocs(Symbol_table* symtab, |
2e30d253 ILT |
92 | Layout* layout, |
93 | Sized_relobj<64, false>* object, | |
94 | unsigned int data_shndx, | |
95 | unsigned int sh_type, | |
96 | const unsigned char* prelocs, | |
97 | size_t reloc_count, | |
730cdc88 ILT |
98 | Output_section* output_section, |
99 | bool needs_special_offset_handling, | |
2e30d253 | 100 | size_t local_symbol_count, |
730cdc88 | 101 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
102 | |
103 | // Finalize the sections. | |
104 | void | |
d5b40221 | 105 | do_finalize_sections(Layout*, const Input_objects*); |
2e30d253 | 106 | |
4fb6c25d ILT |
107 | // Return the value to use for a dynamic which requires special |
108 | // treatment. | |
109 | uint64_t | |
110 | do_dynsym_value(const Symbol*) const; | |
111 | ||
2e30d253 ILT |
112 | // Relocate a section. |
113 | void | |
114 | relocate_section(const Relocate_info<64, false>*, | |
115 | unsigned int sh_type, | |
116 | const unsigned char* prelocs, | |
117 | size_t reloc_count, | |
730cdc88 ILT |
118 | Output_section* output_section, |
119 | bool needs_special_offset_handling, | |
2e30d253 ILT |
120 | unsigned char* view, |
121 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
122 | section_size_type view_size, |
123 | const Reloc_symbol_changes*); | |
2e30d253 | 124 | |
6a74a719 ILT |
125 | // Scan the relocs during a relocatable link. |
126 | void | |
ad0f2072 | 127 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
128 | Layout* layout, |
129 | Sized_relobj<64, false>* object, | |
130 | unsigned int data_shndx, | |
131 | unsigned int sh_type, | |
132 | const unsigned char* prelocs, | |
133 | size_t reloc_count, | |
134 | Output_section* output_section, | |
135 | bool needs_special_offset_handling, | |
136 | size_t local_symbol_count, | |
137 | const unsigned char* plocal_symbols, | |
138 | Relocatable_relocs*); | |
139 | ||
140 | // Relocate a section during a relocatable link. | |
141 | void | |
142 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
143 | unsigned int sh_type, | |
144 | const unsigned char* prelocs, | |
145 | size_t reloc_count, | |
146 | Output_section* output_section, | |
147 | off_t offset_in_output_section, | |
148 | const Relocatable_relocs*, | |
149 | unsigned char* view, | |
150 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
151 | section_size_type view_size, | |
152 | unsigned char* reloc_view, | |
153 | section_size_type reloc_view_size); | |
154 | ||
2e30d253 ILT |
155 | // Return a string used to fill a code section with nops. |
156 | std::string | |
8851ecca | 157 | do_code_fill(section_size_type length) const; |
2e30d253 | 158 | |
9a2d6984 ILT |
159 | // Return whether SYM is defined by the ABI. |
160 | bool | |
9c2d0ef9 | 161 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
162 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
163 | ||
364c7fa5 ILT |
164 | // Adjust -fstack-split code which calls non-stack-split code. |
165 | void | |
166 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
167 | section_offset_type fnoffset, section_size_type fnsize, | |
168 | unsigned char* view, section_size_type view_size, | |
169 | std::string* from, std::string* to) const; | |
170 | ||
96f2030e | 171 | // Return the size of the GOT section. |
fe8718a4 | 172 | section_size_type |
96f2030e ILT |
173 | got_size() |
174 | { | |
175 | gold_assert(this->got_ != NULL); | |
176 | return this->got_->data_size(); | |
177 | } | |
178 | ||
2e30d253 ILT |
179 | private: |
180 | // The class which scans relocations. | |
a036edd8 | 181 | class Scan |
2e30d253 | 182 | { |
a036edd8 ILT |
183 | public: |
184 | Scan() | |
185 | : issued_non_pic_error_(false) | |
186 | { } | |
187 | ||
2e30d253 | 188 | inline void |
ad0f2072 | 189 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
190 | Sized_relobj<64, false>* object, |
191 | unsigned int data_shndx, | |
07f397ab | 192 | Output_section* output_section, |
2e30d253 ILT |
193 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
194 | const elfcpp::Sym<64, false>& lsym); | |
195 | ||
196 | inline void | |
ad0f2072 | 197 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
198 | Sized_relobj<64, false>* object, |
199 | unsigned int data_shndx, | |
07f397ab | 200 | Output_section* output_section, |
2e30d253 ILT |
201 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
202 | Symbol* gsym); | |
e041f13d | 203 | |
a036edd8 | 204 | private: |
e041f13d ILT |
205 | static void |
206 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
207 | ||
208 | static void | |
209 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
210 | Symbol*); | |
a036edd8 ILT |
211 | |
212 | void | |
213 | check_non_pic(Relobj*, unsigned int r_type); | |
214 | ||
215 | // Whether we have issued an error about a non-PIC compilation. | |
216 | bool issued_non_pic_error_; | |
2e30d253 ILT |
217 | }; |
218 | ||
219 | // The class which implements relocation. | |
220 | class Relocate | |
221 | { | |
222 | public: | |
223 | Relocate() | |
497897f9 | 224 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
225 | { } |
226 | ||
227 | ~Relocate() | |
228 | { | |
229 | if (this->skip_call_tls_get_addr_) | |
230 | { | |
231 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 232 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
233 | } |
234 | } | |
235 | ||
236 | // Do a relocation. Return false if the caller should not issue | |
237 | // any warnings about this relocation. | |
238 | inline bool | |
031cdbed ILT |
239 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
240 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
241 | unsigned int r_type, const Sized_symbol<64>*, |
242 | const Symbol_value<64>*, | |
243 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 244 | section_size_type); |
2e30d253 ILT |
245 | |
246 | private: | |
247 | // Do a TLS relocation. | |
248 | inline void | |
7bf1f802 ILT |
249 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
250 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
251 | unsigned int r_type, const Sized_symbol<64>*, |
252 | const Symbol_value<64>*, | |
fe8718a4 ILT |
253 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
254 | section_size_type); | |
2e30d253 | 255 | |
c2b45e22 | 256 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
257 | inline void |
258 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
259 | Output_segment* tls_segment, | |
260 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
261 | elfcpp::Elf_types<64>::Elf_Addr value, | |
262 | unsigned char* view, | |
c2b45e22 | 263 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 264 | section_size_type view_size); |
7bf1f802 | 265 | |
56622147 ILT |
266 | // Do a TLS General-Dynamic to Local-Exec transition. |
267 | inline void | |
268 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
269 | Output_segment* tls_segment, |
270 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
271 | elfcpp::Elf_types<64>::Elf_Addr value, | |
272 | unsigned char* view, | |
fe8718a4 | 273 | section_size_type view_size); |
2e30d253 | 274 | |
c2b45e22 CC |
275 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
276 | inline void | |
277 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
278 | Output_segment* tls_segment, | |
279 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
280 | elfcpp::Elf_types<64>::Elf_Addr value, | |
281 | unsigned char* view, | |
282 | elfcpp::Elf_types<64>::Elf_Addr, | |
283 | section_size_type view_size); | |
284 | ||
285 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
286 | inline void | |
287 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
288 | Output_segment* tls_segment, | |
289 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
290 | elfcpp::Elf_types<64>::Elf_Addr value, | |
291 | unsigned char* view, | |
292 | section_size_type view_size); | |
293 | ||
56622147 | 294 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 295 | inline void |
56622147 | 296 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
297 | Output_segment* tls_segment, |
298 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
299 | elfcpp::Elf_types<64>::Elf_Addr value, | |
300 | unsigned char* view, | |
fe8718a4 | 301 | section_size_type view_size); |
2e30d253 | 302 | |
56622147 ILT |
303 | // Do a TLS Initial-Exec to Local-Exec transition. |
304 | static inline void | |
305 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
306 | Output_segment* tls_segment, |
307 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
308 | elfcpp::Elf_types<64>::Elf_Addr value, | |
309 | unsigned char* view, | |
fe8718a4 | 310 | section_size_type view_size); |
2e30d253 ILT |
311 | |
312 | // This is set if we should skip the next reloc, which should be a | |
313 | // PLT32 reloc against ___tls_get_addr. | |
314 | bool skip_call_tls_get_addr_; | |
497897f9 ILT |
315 | |
316 | // This is set if we see a relocation which could load the address | |
317 | // of the TLS block. Whether we see such a relocation determines | |
318 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
319 | // in debugging sections. | |
320 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
321 | }; |
322 | ||
6a74a719 ILT |
323 | // A class which returns the size required for a relocation type, |
324 | // used while scanning relocs during a relocatable link. | |
325 | class Relocatable_size_for_reloc | |
326 | { | |
327 | public: | |
328 | unsigned int | |
329 | get_size_for_reloc(unsigned int, Relobj*); | |
330 | }; | |
331 | ||
2e30d253 ILT |
332 | // Adjust TLS relocation type based on the options and whether this |
333 | // is a local symbol. | |
e041f13d | 334 | static tls::Tls_optimization |
2e30d253 ILT |
335 | optimize_tls_reloc(bool is_final, int r_type); |
336 | ||
337 | // Get the GOT section, creating it if necessary. | |
338 | Output_data_got<64, false>* | |
339 | got_section(Symbol_table*, Layout*); | |
340 | ||
96f2030e ILT |
341 | // Get the GOT PLT section. |
342 | Output_data_space* | |
343 | got_plt_section() const | |
344 | { | |
345 | gold_assert(this->got_plt_ != NULL); | |
346 | return this->got_plt_; | |
347 | } | |
348 | ||
c2b45e22 CC |
349 | // Create the PLT section. |
350 | void | |
351 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
352 | ||
2e30d253 ILT |
353 | // Create a PLT entry for a global symbol. |
354 | void | |
355 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
356 | ||
9fa33bee | 357 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
358 | void |
359 | define_tls_base_symbol(Symbol_table*, Layout*); | |
360 | ||
c2b45e22 CC |
361 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
362 | void | |
363 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
364 | ||
31d60480 ILT |
365 | // Create a GOT entry for the TLS module index. |
366 | unsigned int | |
367 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
368 | Sized_relobj<64, false>* object); | |
369 | ||
2e30d253 ILT |
370 | // Get the PLT section. |
371 | Output_data_plt_x86_64* | |
372 | plt_section() const | |
373 | { | |
374 | gold_assert(this->plt_ != NULL); | |
375 | return this->plt_; | |
376 | } | |
377 | ||
378 | // Get the dynamic reloc section, creating it if necessary. | |
379 | Reloc_section* | |
0ffd9845 | 380 | rela_dyn_section(Layout*); |
2e30d253 | 381 | |
12c0daef | 382 | // Add a potential copy relocation. |
2e30d253 | 383 | void |
ef9beddf ILT |
384 | copy_reloc(Symbol_table* symtab, Layout* layout, |
385 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
386 | unsigned int shndx, Output_section* output_section, |
387 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
388 | { | |
389 | this->copy_relocs_.copy_reloc(symtab, layout, | |
390 | symtab->get_sized_symbol<64>(sym), | |
391 | object, shndx, output_section, | |
392 | reloc, this->rela_dyn_section(layout)); | |
393 | } | |
2e30d253 ILT |
394 | |
395 | // Information about this specific target which we pass to the | |
396 | // general Target structure. | |
397 | static const Target::Target_info x86_64_info; | |
398 | ||
0a65a3a7 CC |
399 | enum Got_type |
400 | { | |
401 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
402 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
403 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
404 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
405 | }; | |
406 | ||
2e30d253 ILT |
407 | // The GOT section. |
408 | Output_data_got<64, false>* got_; | |
409 | // The PLT section. | |
410 | Output_data_plt_x86_64* plt_; | |
411 | // The GOT PLT section. | |
412 | Output_data_space* got_plt_; | |
413 | // The dynamic reloc section. | |
0ffd9845 | 414 | Reloc_section* rela_dyn_; |
2e30d253 | 415 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 416 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
417 | // Space for variables copied with a COPY reloc. |
418 | Output_data_space* dynbss_; | |
c2b45e22 | 419 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 420 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
421 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
422 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
423 | }; |
424 | ||
425 | const Target::Target_info Target_x86_64::x86_64_info = | |
426 | { | |
427 | 64, // size | |
428 | false, // is_big_endian | |
429 | elfcpp::EM_X86_64, // machine_code | |
430 | false, // has_make_symbol | |
431 | false, // has_resolve | |
432 | true, // has_code_fill | |
35cdfc9a | 433 | true, // is_default_stack_executable |
0864d551 | 434 | '\0', // wrap_char |
2e30d253 | 435 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 436 | 0x400000, // default_text_segment_address |
cd72c291 | 437 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
438 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
439 | elfcpp::SHN_UNDEF, // small_common_shndx | |
440 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
441 | 0, // small_common_section_flags | |
442 | elfcpp::SHF_X86_64_LARGE // large_common_section_flags | |
2e30d253 ILT |
443 | }; |
444 | ||
8a5e3e08 ILT |
445 | // This is called when a new output section is created. This is where |
446 | // we handle the SHF_X86_64_LARGE. | |
447 | ||
448 | void | |
449 | Target_x86_64::do_new_output_section(Output_section *os) const | |
450 | { | |
451 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
452 | os->set_is_large_section(); | |
453 | } | |
454 | ||
2e30d253 ILT |
455 | // Get the GOT section, creating it if necessary. |
456 | ||
457 | Output_data_got<64, false>* | |
458 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
459 | { | |
460 | if (this->got_ == NULL) | |
461 | { | |
462 | gold_assert(symtab != NULL && layout != NULL); | |
463 | ||
464 | this->got_ = new Output_data_got<64, false>(); | |
465 | ||
9f1d377b ILT |
466 | Output_section* os; |
467 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
468 | (elfcpp::SHF_ALLOC | |
469 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 470 | this->got_, false); |
9f1d377b | 471 | os->set_is_relro(); |
2e30d253 ILT |
472 | |
473 | // The old GNU linker creates a .got.plt section. We just | |
474 | // create another set of data in the .got section. Note that we | |
475 | // always create a PLT if we create a GOT, although the PLT | |
476 | // might be empty. | |
7d9e3d98 | 477 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
9f1d377b ILT |
478 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
479 | (elfcpp::SHF_ALLOC | |
480 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 481 | this->got_plt_, false); |
9f1d377b | 482 | os->set_is_relro(); |
2e30d253 ILT |
483 | |
484 | // The first three entries are reserved. | |
27bc2bce | 485 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
486 | |
487 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 488 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
489 | this->got_plt_, |
490 | 0, 0, elfcpp::STT_OBJECT, | |
491 | elfcpp::STB_LOCAL, | |
492 | elfcpp::STV_HIDDEN, 0, | |
493 | false, false); | |
494 | } | |
495 | ||
496 | return this->got_; | |
497 | } | |
498 | ||
499 | // Get the dynamic reloc section, creating it if necessary. | |
500 | ||
501 | Target_x86_64::Reloc_section* | |
0ffd9845 | 502 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 503 | { |
0ffd9845 | 504 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
505 | { |
506 | gold_assert(layout != NULL); | |
d98bc257 | 507 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 508 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
f5c870d2 | 509 | elfcpp::SHF_ALLOC, this->rela_dyn_, true); |
2e30d253 | 510 | } |
0ffd9845 | 511 | return this->rela_dyn_; |
2e30d253 ILT |
512 | } |
513 | ||
514 | // A class to handle the PLT data. | |
515 | ||
516 | class Output_data_plt_x86_64 : public Output_section_data | |
517 | { | |
518 | public: | |
519 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
520 | ||
c2b45e22 CC |
521 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
522 | Output_data_space*); | |
2e30d253 ILT |
523 | |
524 | // Add an entry to the PLT. | |
525 | void | |
526 | add_entry(Symbol* gsym); | |
527 | ||
c2b45e22 CC |
528 | // Add the reserved TLSDESC_PLT entry to the PLT. |
529 | void | |
530 | reserve_tlsdesc_entry(unsigned int got_offset) | |
531 | { this->tlsdesc_got_offset_ = got_offset; } | |
532 | ||
533 | // Return true if a TLSDESC_PLT entry has been reserved. | |
534 | bool | |
535 | has_tlsdesc_entry() const | |
536 | { return this->tlsdesc_got_offset_ != -1U; } | |
537 | ||
538 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
539 | unsigned int | |
540 | get_tlsdesc_got_offset() const | |
541 | { return this->tlsdesc_got_offset_; } | |
542 | ||
543 | // Return the offset of the reserved TLSDESC_PLT entry. | |
544 | unsigned int | |
545 | get_tlsdesc_plt_offset() const | |
546 | { return (this->count_ + 1) * plt_entry_size; } | |
547 | ||
2e30d253 ILT |
548 | // Return the .rel.plt section data. |
549 | const Reloc_section* | |
550 | rel_plt() const | |
551 | { return this->rel_; } | |
552 | ||
553 | protected: | |
554 | void | |
555 | do_adjust_output_section(Output_section* os); | |
556 | ||
7d9e3d98 ILT |
557 | // Write to a map file. |
558 | void | |
559 | do_print_to_mapfile(Mapfile* mapfile) const | |
560 | { mapfile->print_output_data(this, _("** PLT")); } | |
561 | ||
2e30d253 ILT |
562 | private: |
563 | // The size of an entry in the PLT. | |
564 | static const int plt_entry_size = 16; | |
565 | ||
566 | // The first entry in the PLT. | |
567 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
568 | // procedure linkage table for both programs and shared objects." | |
569 | static unsigned char first_plt_entry[plt_entry_size]; | |
570 | ||
571 | // Other entries in the PLT for an executable. | |
572 | static unsigned char plt_entry[plt_entry_size]; | |
573 | ||
c2b45e22 CC |
574 | // The reserved TLSDESC entry in the PLT for an executable. |
575 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
576 | ||
2e30d253 ILT |
577 | // Set the final size. |
578 | void | |
c2b45e22 | 579 | set_final_data_size(); |
2e30d253 ILT |
580 | |
581 | // Write out the PLT data. | |
582 | void | |
583 | do_write(Output_file*); | |
584 | ||
585 | // The reloc section. | |
586 | Reloc_section* rel_; | |
c2b45e22 CC |
587 | // The .got section. |
588 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
589 | // The .got.plt section. |
590 | Output_data_space* got_plt_; | |
591 | // The number of PLT entries. | |
592 | unsigned int count_; | |
c2b45e22 CC |
593 | // Offset of the reserved TLSDESC_GOT entry when needed. |
594 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
595 | }; |
596 | ||
597 | // Create the PLT section. The ordinary .got section is an argument, | |
598 | // since we need to refer to the start. We also create our own .got | |
599 | // section just for PLT entries. | |
600 | ||
601 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 602 | Output_data_got<64, false>* got, |
2e30d253 | 603 | Output_data_space* got_plt) |
c2b45e22 CC |
604 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
605 | tlsdesc_got_offset_(-1U) | |
2e30d253 | 606 | { |
d98bc257 | 607 | this->rel_ = new Reloc_section(false); |
2e30d253 | 608 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
f5c870d2 | 609 | elfcpp::SHF_ALLOC, this->rel_, true); |
2e30d253 ILT |
610 | } |
611 | ||
612 | void | |
613 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
614 | { | |
b0481b0b | 615 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
616 | } |
617 | ||
618 | // Add an entry to the PLT. | |
619 | ||
620 | void | |
621 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
622 | { | |
623 | gold_assert(!gsym->has_plt_offset()); | |
624 | ||
625 | // Note that when setting the PLT offset we skip the initial | |
626 | // reserved PLT entry. | |
627 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
628 | ||
629 | ++this->count_; | |
630 | ||
fe8718a4 | 631 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
632 | |
633 | // Every PLT entry needs a GOT entry which points back to the PLT | |
634 | // entry (this will be changed by the dynamic linker, normally | |
635 | // lazily when the function is called). | |
27bc2bce | 636 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
637 | |
638 | // Every PLT entry needs a reloc. | |
639 | gsym->set_needs_dynsym_entry(); | |
640 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
641 | got_offset, 0); | |
642 | ||
643 | // Note that we don't need to save the symbol. The contents of the | |
644 | // PLT are independent of which symbols are used. The symbols only | |
645 | // appear in the relocations. | |
646 | } | |
647 | ||
c2b45e22 CC |
648 | // Set the final size. |
649 | void | |
650 | Output_data_plt_x86_64::set_final_data_size() | |
651 | { | |
652 | unsigned int count = this->count_; | |
653 | if (this->has_tlsdesc_entry()) | |
654 | ++count; | |
655 | this->set_data_size((count + 1) * plt_entry_size); | |
656 | } | |
657 | ||
2e30d253 ILT |
658 | // The first entry in the PLT for an executable. |
659 | ||
660 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
661 | { | |
662 | // From AMD64 ABI Draft 0.98, page 76 | |
663 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 664 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
665 | 0xff, 0x25, // jmp indirect |
666 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
667 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
668 | }; | |
669 | ||
670 | // Subsequent entries in the PLT for an executable. | |
671 | ||
672 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
673 | { | |
674 | // From AMD64 ABI Draft 0.98, page 76 | |
675 | 0xff, 0x25, // jmpq indirect | |
676 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
677 | 0x68, // pushq immediate | |
678 | 0, 0, 0, 0, // replaced with offset into relocation table | |
679 | 0xe9, // jmpq relative | |
680 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
681 | }; | |
682 | ||
c2b45e22 CC |
683 | // The reserved TLSDESC entry in the PLT for an executable. |
684 | ||
685 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
686 | { | |
687 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
688 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
689 | 0xff, 0x35, // pushq x(%rip) | |
690 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
691 | 0xff, 0x25, // jmpq *y(%rip) | |
692 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
693 | 0x0f, 0x1f, // nop | |
694 | 0x40, 0 | |
695 | }; | |
696 | ||
2e30d253 ILT |
697 | // Write out the PLT. This uses the hand-coded instructions above, |
698 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
699 | ||
700 | void | |
701 | Output_data_plt_x86_64::do_write(Output_file* of) | |
702 | { | |
703 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
704 | const section_size_type oview_size = |
705 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
706 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
707 | ||
708 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
709 | const section_size_type got_size = |
710 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
711 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
712 | got_size); | |
713 | ||
714 | unsigned char* pov = oview; | |
715 | ||
c2b45e22 | 716 | // The base address of the .plt section. |
a984ee1d | 717 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 718 | // The base address of the .got section. |
a984ee1d | 719 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
720 | // The base address of the PLT portion of the .got section, |
721 | // which is where the GOT pointer will point, and where the | |
722 | // three reserved GOT entries are located. | |
a984ee1d | 723 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
724 | |
725 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 726 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
727 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
728 | (got_address + 8 | |
729 | - (plt_address + 6))); | |
730 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
731 | (got_address + 16 | |
732 | - (plt_address + 12))); | |
2e30d253 ILT |
733 | pov += plt_entry_size; |
734 | ||
735 | unsigned char* got_pov = got_view; | |
736 | ||
737 | memset(got_pov, 0, 24); | |
738 | got_pov += 24; | |
739 | ||
740 | unsigned int plt_offset = plt_entry_size; | |
741 | unsigned int got_offset = 24; | |
742 | const unsigned int count = this->count_; | |
743 | for (unsigned int plt_index = 0; | |
744 | plt_index < count; | |
745 | ++plt_index, | |
746 | pov += plt_entry_size, | |
747 | got_pov += 8, | |
748 | plt_offset += plt_entry_size, | |
749 | got_offset += 8) | |
750 | { | |
751 | // Set and adjust the PLT entry itself. | |
752 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
753 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
754 | (got_address + got_offset | |
755 | - (plt_address + plt_offset | |
756 | + 6))); | |
2e30d253 ILT |
757 | |
758 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
759 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
760 | - (plt_offset + plt_entry_size)); | |
761 | ||
762 | // Set the entry in the GOT. | |
763 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
764 | } | |
765 | ||
c2b45e22 CC |
766 | if (this->has_tlsdesc_entry()) |
767 | { | |
768 | // Set and adjust the reserved TLSDESC PLT entry. | |
769 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
770 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
771 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
772 | (got_address + 8 | |
773 | - (plt_address + plt_offset | |
774 | + 6))); | |
775 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
776 | (got_base | |
777 | + tlsdesc_got_offset | |
778 | - (plt_address + plt_offset | |
779 | + 12))); | |
780 | pov += plt_entry_size; | |
781 | } | |
782 | ||
fe8718a4 ILT |
783 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
784 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
785 | |
786 | of->write_output_view(offset, oview_size, oview); | |
787 | of->write_output_view(got_file_offset, got_size, got_view); | |
788 | } | |
789 | ||
c2b45e22 | 790 | // Create the PLT section. |
2e30d253 ILT |
791 | |
792 | void | |
c2b45e22 | 793 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 794 | { |
2e30d253 ILT |
795 | if (this->plt_ == NULL) |
796 | { | |
797 | // Create the GOT sections first. | |
798 | this->got_section(symtab, layout); | |
799 | ||
c2b45e22 CC |
800 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
801 | this->got_plt_); | |
2e30d253 ILT |
802 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
803 | (elfcpp::SHF_ALLOC | |
804 | | elfcpp::SHF_EXECINSTR), | |
f5c870d2 | 805 | this->plt_, false); |
2e30d253 | 806 | } |
c2b45e22 CC |
807 | } |
808 | ||
809 | // Create a PLT entry for a global symbol. | |
810 | ||
811 | void | |
812 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
813 | Symbol* gsym) | |
814 | { | |
815 | if (gsym->has_plt_offset()) | |
816 | return; | |
817 | ||
818 | if (this->plt_ == NULL) | |
819 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
820 | |
821 | this->plt_->add_entry(gsym); | |
822 | } | |
823 | ||
9fa33bee | 824 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
825 | |
826 | void | |
827 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
828 | { | |
829 | if (this->tls_base_symbol_defined_) | |
830 | return; | |
831 | ||
832 | Output_segment* tls_segment = layout->tls_segment(); | |
833 | if (tls_segment != NULL) | |
834 | { | |
183fd0e3 | 835 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
836 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
837 | tls_segment, 0, 0, | |
838 | elfcpp::STT_TLS, | |
839 | elfcpp::STB_LOCAL, | |
840 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
841 | (is_exec |
842 | ? Symbol::SEGMENT_END | |
843 | : Symbol::SEGMENT_START), | |
844 | true); | |
edfbb029 CC |
845 | } |
846 | this->tls_base_symbol_defined_ = true; | |
847 | } | |
848 | ||
c2b45e22 CC |
849 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
850 | ||
851 | void | |
852 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
853 | Layout* layout) | |
854 | { | |
855 | if (this->plt_ == NULL) | |
856 | this->make_plt_section(symtab, layout); | |
857 | ||
858 | if (!this->plt_->has_tlsdesc_entry()) | |
859 | { | |
860 | // Allocate the TLSDESC_GOT entry. | |
861 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
862 | unsigned int got_offset = got->add_constant(0); | |
863 | ||
864 | // Allocate the TLSDESC_PLT entry. | |
865 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
866 | } | |
867 | } | |
868 | ||
31d60480 ILT |
869 | // Create a GOT entry for the TLS module index. |
870 | ||
871 | unsigned int | |
872 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
873 | Sized_relobj<64, false>* object) | |
874 | { | |
875 | if (this->got_mod_index_offset_ == -1U) | |
876 | { | |
877 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
878 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
879 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
880 | unsigned int got_offset = got->add_constant(0); | |
881 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
882 | got_offset, 0); | |
009a67a2 | 883 | got->add_constant(0); |
31d60480 ILT |
884 | this->got_mod_index_offset_ = got_offset; |
885 | } | |
886 | return this->got_mod_index_offset_; | |
887 | } | |
888 | ||
2e30d253 ILT |
889 | // Optimize the TLS relocation type based on what we know about the |
890 | // symbol. IS_FINAL is true if the final address of this symbol is | |
891 | // known at link time. | |
892 | ||
e041f13d | 893 | tls::Tls_optimization |
2e30d253 ILT |
894 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
895 | { | |
2e30d253 ILT |
896 | // If we are generating a shared library, then we can't do anything |
897 | // in the linker. | |
8851ecca | 898 | if (parameters->options().shared()) |
e041f13d | 899 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
900 | |
901 | switch (r_type) | |
902 | { | |
903 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
904 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
905 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
906 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
907 | // access. Since we know that we are generating an executable, |
908 | // we can convert this to Initial-Exec. If we also know that | |
909 | // this is a local symbol, we can further switch to Local-Exec. | |
910 | if (is_final) | |
e041f13d ILT |
911 | return tls::TLSOPT_TO_LE; |
912 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 913 | |
d61c17ea | 914 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
915 | // This is Local-Dynamic, which refers to a local symbol in the |
916 | // dynamic TLS block. Since we know that we generating an | |
917 | // executable, we can switch to Local-Exec. | |
e041f13d | 918 | return tls::TLSOPT_TO_LE; |
2e30d253 | 919 | |
0ffd9845 | 920 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
921 | case elfcpp::R_X86_64_DTPOFF64: |
922 | // Another Local-Dynamic reloc. | |
e041f13d | 923 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 924 | |
d61c17ea | 925 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
926 | // These are Initial-Exec relocs which get the thread offset |
927 | // from the GOT. If we know that we are linking against the | |
928 | // local symbol, we can switch to Local-Exec, which links the | |
929 | // thread offset into the instruction. | |
930 | if (is_final) | |
e041f13d ILT |
931 | return tls::TLSOPT_TO_LE; |
932 | return tls::TLSOPT_NONE; | |
2e30d253 | 933 | |
d61c17ea | 934 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
935 | // When we already have Local-Exec, there is nothing further we |
936 | // can do. | |
e041f13d | 937 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
938 | |
939 | default: | |
940 | gold_unreachable(); | |
941 | } | |
2e30d253 ILT |
942 | } |
943 | ||
e041f13d ILT |
944 | // Report an unsupported relocation against a local symbol. |
945 | ||
946 | void | |
947 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
948 | unsigned int r_type) | |
949 | { | |
75f2446e ILT |
950 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
951 | object->name().c_str(), r_type); | |
e041f13d ILT |
952 | } |
953 | ||
a036edd8 ILT |
954 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
955 | // dynamic linker does not support it, issue an error. The GNU linker | |
956 | // only issues a non-PIC error for an allocated read-only section. | |
957 | // Here we know the section is allocated, but we don't know that it is | |
958 | // read-only. But we check for all the relocation types which the | |
959 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
960 | // error even if the section is not read-only. | |
961 | ||
962 | void | |
963 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
964 | { | |
965 | switch (r_type) | |
966 | { | |
967 | // These are the relocation types supported by glibc for x86_64. | |
968 | case elfcpp::R_X86_64_RELATIVE: | |
969 | case elfcpp::R_X86_64_GLOB_DAT: | |
970 | case elfcpp::R_X86_64_JUMP_SLOT: | |
971 | case elfcpp::R_X86_64_DTPMOD64: | |
972 | case elfcpp::R_X86_64_DTPOFF64: | |
973 | case elfcpp::R_X86_64_TPOFF64: | |
974 | case elfcpp::R_X86_64_64: | |
975 | case elfcpp::R_X86_64_32: | |
976 | case elfcpp::R_X86_64_PC32: | |
977 | case elfcpp::R_X86_64_COPY: | |
978 | return; | |
979 | ||
980 | default: | |
981 | // This prevents us from issuing more than one error per reloc | |
982 | // section. But we can still wind up issuing more than one | |
983 | // error per object file. | |
984 | if (this->issued_non_pic_error_) | |
985 | return; | |
33aea2fd | 986 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
987 | object->error(_("requires unsupported dynamic reloc; " |
988 | "recompile with -fPIC")); | |
989 | this->issued_non_pic_error_ = true; | |
990 | return; | |
991 | ||
992 | case elfcpp::R_X86_64_NONE: | |
993 | gold_unreachable(); | |
994 | } | |
995 | } | |
996 | ||
2e30d253 ILT |
997 | // Scan a relocation for a local symbol. |
998 | ||
999 | inline void | |
ad0f2072 | 1000 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1001 | Layout* layout, |
1002 | Target_x86_64* target, | |
1003 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1004 | unsigned int data_shndx, |
4f4c5f80 | 1005 | Output_section* output_section, |
0ffd9845 | 1006 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1007 | unsigned int r_type, |
7bf1f802 | 1008 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1009 | { |
1010 | switch (r_type) | |
1011 | { | |
1012 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1013 | case elfcpp::R_386_GNU_VTINHERIT: |
1014 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1015 | break; |
1016 | ||
1017 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1018 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1019 | // executable), we need to create a dynamic relocation for this |
1020 | // location. The relocation applied at link time will apply the | |
1021 | // link-time value, so we flag the location with an | |
1022 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1023 | // relocate it easily. |
8851ecca | 1024 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1025 | { |
e8c846c3 | 1026 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1027 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1028 | rela_dyn->add_local_relative(object, r_sym, |
1029 | elfcpp::R_X86_64_RELATIVE, | |
1030 | output_section, data_shndx, | |
1031 | reloc.get_r_offset(), | |
1032 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1033 | } |
1034 | break; | |
1035 | ||
2e30d253 ILT |
1036 | case elfcpp::R_X86_64_32: |
1037 | case elfcpp::R_X86_64_32S: | |
1038 | case elfcpp::R_X86_64_16: | |
1039 | case elfcpp::R_X86_64_8: | |
96f2030e | 1040 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1041 | // executable), we need to create a dynamic relocation for this |
1042 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1043 | // because that is always a 64-bit relocation. | |
8851ecca | 1044 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1045 | { |
a036edd8 ILT |
1046 | this->check_non_pic(object, r_type); |
1047 | ||
96f2030e | 1048 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1049 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1050 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1051 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1052 | data_shndx, reloc.get_r_offset(), | |
1053 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1054 | else |
1055 | { | |
1056 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1057 | unsigned int shndx = lsym.get_st_shndx(); |
1058 | bool is_ordinary; | |
1059 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1060 | &is_ordinary); | |
1061 | if (!is_ordinary) | |
1062 | object->error(_("section symbol %u has bad shndx %u"), | |
1063 | r_sym, shndx); | |
1064 | else | |
1065 | rela_dyn->add_local_section(object, shndx, | |
1066 | r_type, output_section, | |
1067 | data_shndx, reloc.get_r_offset(), | |
1068 | reloc.get_r_addend()); | |
dceae3c1 | 1069 | } |
96f2030e | 1070 | } |
2e30d253 ILT |
1071 | break; |
1072 | ||
1073 | case elfcpp::R_X86_64_PC64: | |
1074 | case elfcpp::R_X86_64_PC32: | |
1075 | case elfcpp::R_X86_64_PC16: | |
1076 | case elfcpp::R_X86_64_PC8: | |
1077 | break; | |
1078 | ||
f389a824 ILT |
1079 | case elfcpp::R_X86_64_PLT32: |
1080 | // Since we know this is a local symbol, we can handle this as a | |
1081 | // PC32 reloc. | |
1082 | break; | |
1083 | ||
fdc2f80f | 1084 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1085 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1086 | case elfcpp::R_X86_64_GOTPC64: |
1087 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1088 | // We need a GOT section. |
1089 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1090 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1091 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1092 | break; |
1093 | ||
0ffd9845 ILT |
1094 | case elfcpp::R_X86_64_GOT64: |
1095 | case elfcpp::R_X86_64_GOT32: | |
1096 | case elfcpp::R_X86_64_GOTPCREL64: | |
1097 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1098 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1099 | { |
1100 | // The symbol requires a GOT entry. | |
1101 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1102 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1103 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1104 | { |
1105 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1106 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1107 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1108 | { |
1109 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1110 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1111 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1112 | rela_dyn->add_local_relative( |
1113 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1114 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1115 | else |
dceae3c1 | 1116 | { |
a036edd8 ILT |
1117 | this->check_non_pic(object, r_type); |
1118 | ||
dceae3c1 | 1119 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1120 | rela_dyn->add_local( |
1121 | object, r_sym, r_type, got, | |
1122 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1123 | } |
0ffd9845 ILT |
1124 | } |
1125 | } | |
ee9e9e86 ILT |
1126 | // For GOTPLT64, we'd normally want a PLT section, but since |
1127 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1128 | } |
1129 | break; | |
1130 | ||
2e30d253 ILT |
1131 | case elfcpp::R_X86_64_COPY: |
1132 | case elfcpp::R_X86_64_GLOB_DAT: | |
1133 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1134 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1135 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1136 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1137 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1138 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1139 | gold_error(_("%s: unexpected reloc %u in object file"), |
1140 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1141 | break; |
1142 | ||
d61c17ea | 1143 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1144 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1145 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1146 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1147 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1148 | case elfcpp::R_X86_64_DTPOFF32: |
1149 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1150 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1151 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1152 | { |
8851ecca | 1153 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1154 | const tls::Tls_optimization optimized_type |
1155 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1156 | switch (r_type) |
1157 | { | |
56622147 | 1158 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1159 | if (optimized_type == tls::TLSOPT_NONE) |
1160 | { | |
1161 | // Create a pair of GOT entries for the module index and | |
1162 | // dtv-relative offset. | |
1163 | Output_data_got<64, false>* got | |
1164 | = target->got_section(symtab, layout); | |
1165 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1166 | unsigned int shndx = lsym.get_st_shndx(); |
1167 | bool is_ordinary; | |
1168 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1169 | if (!is_ordinary) | |
1170 | object->error(_("local symbol %u has bad shndx %u"), | |
1171 | r_sym, shndx); | |
1172 | else | |
1173 | got->add_local_pair_with_rela(object, r_sym, | |
1174 | shndx, | |
1175 | GOT_TYPE_TLS_PAIR, | |
1176 | target->rela_dyn_section(layout), | |
1177 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1178 | } |
1179 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1180 | unsupported_reloc_local(object, r_type); | |
1181 | break; | |
1182 | ||
56622147 | 1183 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1184 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1185 | if (optimized_type == tls::TLSOPT_NONE) |
1186 | { | |
1187 | // Create reserved PLT and GOT entries for the resolver. | |
1188 | target->reserve_tlsdesc_entries(symtab, layout); | |
1189 | ||
1190 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1191 | Output_data_got<64, false>* got | |
1192 | = target->got_section(symtab, layout); | |
1193 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1194 | unsigned int shndx = lsym.get_st_shndx(); |
1195 | bool is_ordinary; | |
1196 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1197 | if (!is_ordinary) | |
1198 | object->error(_("local symbol %u has bad shndx %u"), | |
1199 | r_sym, shndx); | |
1200 | else | |
1201 | got->add_local_pair_with_rela(object, r_sym, | |
1202 | shndx, | |
1203 | GOT_TYPE_TLS_DESC, | |
1204 | target->rela_dyn_section(layout), | |
1205 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1206 | } |
1207 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1208 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1209 | break; |
1210 | ||
c2b45e22 CC |
1211 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1212 | break; | |
1213 | ||
e041f13d | 1214 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1215 | if (optimized_type == tls::TLSOPT_NONE) |
1216 | { | |
1217 | // Create a GOT entry for the module index. | |
31d60480 | 1218 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1219 | } |
1220 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1221 | unsupported_reloc_local(object, r_type); | |
1222 | break; | |
1223 | ||
0ffd9845 ILT |
1224 | case elfcpp::R_X86_64_DTPOFF32: |
1225 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1226 | break; |
1227 | ||
56622147 | 1228 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1229 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1230 | if (optimized_type == tls::TLSOPT_NONE) |
1231 | { | |
1232 | // Create a GOT entry for the tp-relative offset. | |
1233 | Output_data_got<64, false>* got | |
1234 | = target->got_section(symtab, layout); | |
1235 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1236 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1237 | target->rela_dyn_section(layout), |
1238 | elfcpp::R_X86_64_TPOFF64); | |
1239 | } | |
1240 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1241 | unsupported_reloc_local(object, r_type); |
1242 | break; | |
0ffd9845 | 1243 | |
56622147 | 1244 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1245 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1246 | if (output_is_shared) |
1247 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1248 | break; |
e041f13d ILT |
1249 | |
1250 | default: | |
1251 | gold_unreachable(); | |
2e30d253 ILT |
1252 | } |
1253 | } | |
1254 | break; | |
2e30d253 | 1255 | |
fdc2f80f ILT |
1256 | case elfcpp::R_X86_64_SIZE32: |
1257 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1258 | default: |
75f2446e ILT |
1259 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1260 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1261 | break; |
1262 | } | |
1263 | } | |
1264 | ||
1265 | ||
e041f13d ILT |
1266 | // Report an unsupported relocation against a global symbol. |
1267 | ||
1268 | void | |
1269 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1270 | unsigned int r_type, | |
1271 | Symbol* gsym) | |
1272 | { | |
75f2446e | 1273 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1274 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1275 | } |
1276 | ||
2e30d253 ILT |
1277 | // Scan a relocation for a global symbol. |
1278 | ||
1279 | inline void | |
ad0f2072 | 1280 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1281 | Layout* layout, |
1282 | Target_x86_64* target, | |
1283 | Sized_relobj<64, false>* object, | |
1284 | unsigned int data_shndx, | |
4f4c5f80 | 1285 | Output_section* output_section, |
d61c17ea ILT |
1286 | const elfcpp::Rela<64, false>& reloc, |
1287 | unsigned int r_type, | |
1288 | Symbol* gsym) | |
2e30d253 ILT |
1289 | { |
1290 | switch (r_type) | |
1291 | { | |
1292 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1293 | case elfcpp::R_386_GNU_VTINHERIT: |
1294 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1295 | break; |
1296 | ||
1297 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1298 | case elfcpp::R_X86_64_32: |
1299 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1300 | case elfcpp::R_X86_64_16: |
2e30d253 | 1301 | case elfcpp::R_X86_64_8: |
96f2030e | 1302 | { |
d61c6bd4 ILT |
1303 | // Make a PLT entry if necessary. |
1304 | if (gsym->needs_plt_entry()) | |
1305 | { | |
1306 | target->make_plt_entry(symtab, layout, gsym); | |
1307 | // Since this is not a PC-relative relocation, we may be | |
1308 | // taking the address of a function. In that case we need to | |
1309 | // set the entry in the dynamic symbol table to the address of | |
1310 | // the PLT entry. | |
8851ecca | 1311 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1312 | gsym->set_needs_dynsym_value(); |
1313 | } | |
1314 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1315 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1316 | { |
966d4097 | 1317 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1318 | { |
12c0daef | 1319 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1320 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1321 | } |
1322 | else if (r_type == elfcpp::R_X86_64_64 | |
1323 | && gsym->can_use_relative_reloc(false)) | |
1324 | { | |
1325 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1326 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1327 | output_section, object, | |
1328 | data_shndx, reloc.get_r_offset(), | |
1329 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1330 | } |
1331 | else | |
1332 | { | |
a036edd8 | 1333 | this->check_non_pic(object, r_type); |
96f2030e | 1334 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1335 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1336 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1337 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1338 | } |
1339 | } | |
1340 | } | |
1341 | break; | |
1342 | ||
1343 | case elfcpp::R_X86_64_PC64: | |
1344 | case elfcpp::R_X86_64_PC32: | |
1345 | case elfcpp::R_X86_64_PC16: | |
1346 | case elfcpp::R_X86_64_PC8: | |
1347 | { | |
1348 | // Make a PLT entry if necessary. | |
1349 | if (gsym->needs_plt_entry()) | |
1350 | target->make_plt_entry(symtab, layout, gsym); | |
1351 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1352 | int flags = Symbol::NON_PIC_REF; |
1353 | if (gsym->type() == elfcpp::STT_FUNC) | |
1354 | flags |= Symbol::FUNCTION_CALL; | |
1355 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1356 | { |
966d4097 | 1357 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1358 | { |
12c0daef | 1359 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1360 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1361 | } |
86849f1f | 1362 | else |
d61c6bd4 | 1363 | { |
a036edd8 | 1364 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1365 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1366 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1367 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1368 | reloc.get_r_addend()); |
1369 | } | |
86849f1f | 1370 | } |
d61c6bd4 | 1371 | } |
2e30d253 ILT |
1372 | break; |
1373 | ||
ff006520 | 1374 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1375 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1376 | case elfcpp::R_X86_64_GOTPCREL64: |
1377 | case elfcpp::R_X86_64_GOTPCREL: | |
1378 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1379 | { |
1380 | // The symbol requires a GOT entry. | |
1381 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1382 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1383 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1384 | else |
1385 | { | |
2e30d253 ILT |
1386 | // If this symbol is not fully resolved, we need to add a |
1387 | // dynamic relocation for it. | |
7bf1f802 | 1388 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1389 | if (gsym->is_from_dynobj() |
1390 | || gsym->is_undefined() | |
1391 | || gsym->is_preemptible()) | |
0a65a3a7 | 1392 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1393 | elfcpp::R_X86_64_GLOB_DAT); |
1394 | else | |
2e30d253 | 1395 | { |
0a65a3a7 CC |
1396 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1397 | rela_dyn->add_global_relative( | |
1398 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1399 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1400 | } |
1401 | } | |
ee9e9e86 ILT |
1402 | // For GOTPLT64, we also need a PLT entry (but only if the |
1403 | // symbol is not fully resolved). | |
1404 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1405 | && !gsym->final_value_is_known()) | |
1406 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1407 | } |
1408 | break; | |
1409 | ||
1410 | case elfcpp::R_X86_64_PLT32: | |
1411 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1412 | // Otherwise we need a PLT entry. | |
1413 | if (gsym->final_value_is_known()) | |
1414 | break; | |
96f2030e ILT |
1415 | // If building a shared library, we can also skip the PLT entry |
1416 | // if the symbol is defined in the output file and is protected | |
1417 | // or hidden. | |
1418 | if (gsym->is_defined() | |
1419 | && !gsym->is_from_dynobj() | |
1420 | && !gsym->is_preemptible()) | |
1421 | break; | |
2e30d253 ILT |
1422 | target->make_plt_entry(symtab, layout, gsym); |
1423 | break; | |
1424 | ||
fdc2f80f | 1425 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1426 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1427 | case elfcpp::R_X86_64_GOTPC64: |
1428 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1429 | // We need a GOT section. |
1430 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1431 | // For PLTOFF64, we also need a PLT entry (but only if the |
1432 | // symbol is not fully resolved). | |
1433 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1434 | && !gsym->final_value_is_known()) | |
1435 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1436 | break; |
1437 | ||
2e30d253 ILT |
1438 | case elfcpp::R_X86_64_COPY: |
1439 | case elfcpp::R_X86_64_GLOB_DAT: | |
1440 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1441 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1442 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1443 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1444 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1445 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1446 | gold_error(_("%s: unexpected reloc %u in object file"), |
1447 | object->name().c_str(), r_type); | |
2e30d253 | 1448 | break; |
2e30d253 | 1449 | |
d61c17ea | 1450 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1451 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1452 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1453 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1454 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1455 | case elfcpp::R_X86_64_DTPOFF32: |
1456 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1457 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1458 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1459 | { |
1460 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1461 | const tls::Tls_optimization optimized_type |
1462 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1463 | switch (r_type) |
1464 | { | |
56622147 | 1465 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1466 | if (optimized_type == tls::TLSOPT_NONE) |
1467 | { | |
1468 | // Create a pair of GOT entries for the module index and | |
1469 | // dtv-relative offset. | |
1470 | Output_data_got<64, false>* got | |
1471 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1472 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1473 | target->rela_dyn_section(layout), | |
1474 | elfcpp::R_X86_64_DTPMOD64, | |
1475 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1476 | } |
1477 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1478 | { | |
1479 | // Create a GOT entry for the tp-relative offset. | |
1480 | Output_data_got<64, false>* got | |
1481 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1482 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1483 | target->rela_dyn_section(layout), |
1484 | elfcpp::R_X86_64_TPOFF64); | |
1485 | } | |
1486 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1487 | unsupported_reloc_global(object, r_type, gsym); | |
1488 | break; | |
1489 | ||
56622147 | 1490 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1491 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1492 | if (optimized_type == tls::TLSOPT_NONE) |
1493 | { | |
1494 | // Create reserved PLT and GOT entries for the resolver. | |
1495 | target->reserve_tlsdesc_entries(symtab, layout); | |
1496 | ||
1497 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1498 | Output_data_got<64, false>* got | |
1499 | = target->got_section(symtab, layout); | |
1500 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1501 | target->rela_dyn_section(layout), | |
1502 | elfcpp::R_X86_64_TLSDESC, 0); | |
1503 | } | |
1504 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1505 | { | |
1506 | // Create a GOT entry for the tp-relative offset. | |
1507 | Output_data_got<64, false>* got | |
1508 | = target->got_section(symtab, layout); | |
1509 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1510 | target->rela_dyn_section(layout), | |
1511 | elfcpp::R_X86_64_TPOFF64); | |
1512 | } | |
1513 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1514 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1515 | break; |
1516 | ||
c2b45e22 CC |
1517 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1518 | break; | |
1519 | ||
e041f13d | 1520 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1521 | if (optimized_type == tls::TLSOPT_NONE) |
1522 | { | |
1523 | // Create a GOT entry for the module index. | |
31d60480 | 1524 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1525 | } |
1526 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1527 | unsupported_reloc_global(object, r_type, gsym); | |
1528 | break; | |
1529 | ||
0ffd9845 ILT |
1530 | case elfcpp::R_X86_64_DTPOFF32: |
1531 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1532 | break; |
1533 | ||
56622147 | 1534 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1535 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1536 | if (optimized_type == tls::TLSOPT_NONE) |
1537 | { | |
1538 | // Create a GOT entry for the tp-relative offset. | |
1539 | Output_data_got<64, false>* got | |
1540 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1541 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1542 | target->rela_dyn_section(layout), |
1543 | elfcpp::R_X86_64_TPOFF64); | |
1544 | } | |
1545 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1546 | unsupported_reloc_global(object, r_type, gsym); |
1547 | break; | |
0ffd9845 | 1548 | |
56622147 | 1549 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1550 | layout->set_has_static_tls(); |
8851ecca | 1551 | if (parameters->options().shared()) |
7bf1f802 | 1552 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1553 | break; |
e041f13d ILT |
1554 | |
1555 | default: | |
1556 | gold_unreachable(); | |
2e30d253 ILT |
1557 | } |
1558 | } | |
1559 | break; | |
fdc2f80f ILT |
1560 | |
1561 | case elfcpp::R_X86_64_SIZE32: | |
1562 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1563 | default: |
75f2446e | 1564 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1565 | object->name().c_str(), r_type, |
1566 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1567 | break; |
1568 | } | |
1569 | } | |
1570 | ||
6d03d481 | 1571 | void |
ad0f2072 | 1572 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1573 | Layout* layout, |
1574 | Sized_relobj<64, false>* object, | |
1575 | unsigned int data_shndx, | |
1576 | unsigned int sh_type, | |
1577 | const unsigned char* prelocs, | |
1578 | size_t reloc_count, | |
1579 | Output_section* output_section, | |
1580 | bool needs_special_offset_handling, | |
1581 | size_t local_symbol_count, | |
1582 | const unsigned char* plocal_symbols) | |
1583 | { | |
1584 | ||
1585 | if (sh_type == elfcpp::SHT_REL) | |
1586 | { | |
1587 | return; | |
1588 | } | |
1589 | ||
1590 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1591 | Target_x86_64::Scan>( | |
6d03d481 ST |
1592 | symtab, |
1593 | layout, | |
1594 | this, | |
1595 | object, | |
1596 | data_shndx, | |
1597 | prelocs, | |
1598 | reloc_count, | |
1599 | output_section, | |
1600 | needs_special_offset_handling, | |
1601 | local_symbol_count, | |
1602 | plocal_symbols); | |
1603 | ||
1604 | } | |
2e30d253 ILT |
1605 | // Scan relocations for a section. |
1606 | ||
1607 | void | |
ad0f2072 | 1608 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
1609 | Layout* layout, |
1610 | Sized_relobj<64, false>* object, | |
1611 | unsigned int data_shndx, | |
1612 | unsigned int sh_type, | |
1613 | const unsigned char* prelocs, | |
1614 | size_t reloc_count, | |
730cdc88 ILT |
1615 | Output_section* output_section, |
1616 | bool needs_special_offset_handling, | |
d61c17ea | 1617 | size_t local_symbol_count, |
730cdc88 | 1618 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1619 | { |
1620 | if (sh_type == elfcpp::SHT_REL) | |
1621 | { | |
75f2446e ILT |
1622 | gold_error(_("%s: unsupported REL reloc section"), |
1623 | object->name().c_str()); | |
1624 | return; | |
2e30d253 ILT |
1625 | } |
1626 | ||
1627 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1628 | Target_x86_64::Scan>( | |
2e30d253 ILT |
1629 | symtab, |
1630 | layout, | |
1631 | this, | |
1632 | object, | |
1633 | data_shndx, | |
1634 | prelocs, | |
1635 | reloc_count, | |
730cdc88 ILT |
1636 | output_section, |
1637 | needs_special_offset_handling, | |
2e30d253 | 1638 | local_symbol_count, |
730cdc88 | 1639 | plocal_symbols); |
2e30d253 ILT |
1640 | } |
1641 | ||
1642 | // Finalize the sections. | |
1643 | ||
1644 | void | |
d5b40221 | 1645 | Target_x86_64::do_finalize_sections(Layout* layout, const Input_objects*) |
2e30d253 ILT |
1646 | { |
1647 | // Fill in some more dynamic tags. | |
1648 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1649 | if (odyn != NULL) | |
1650 | { | |
22b127cc ILT |
1651 | if (this->got_plt_ != NULL |
1652 | && this->got_plt_->output_section() != NULL) | |
2e30d253 ILT |
1653 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); |
1654 | ||
22b127cc ILT |
1655 | if (this->plt_ != NULL |
1656 | && this->plt_->output_section() != NULL) | |
2e30d253 ILT |
1657 | { |
1658 | const Output_data* od = this->plt_->rel_plt(); | |
1659 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1660 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1661 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1662 | if (this->plt_->has_tlsdesc_entry()) |
1663 | { | |
1664 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1665 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1666 | this->got_->finalize_data_size(); | |
1667 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1668 | this->plt_, plt_offset); | |
1669 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1670 | this->got_, got_offset); | |
1671 | } | |
2e30d253 ILT |
1672 | } |
1673 | ||
22b127cc ILT |
1674 | if (this->rela_dyn_ != NULL |
1675 | && this->rela_dyn_->output_section() != NULL) | |
2e30d253 | 1676 | { |
0ffd9845 | 1677 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1678 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1679 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1680 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1681 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1682 | } |
1683 | ||
8851ecca | 1684 | if (!parameters->options().shared()) |
2e30d253 ILT |
1685 | { |
1686 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1687 | // linker at run time, and used by the debugger. | |
1688 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1689 | } | |
1690 | } | |
1691 | ||
1692 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1693 | // relocs. | |
12c0daef ILT |
1694 | if (this->copy_relocs_.any_saved_relocs()) |
1695 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1696 | } |
1697 | ||
1698 | // Perform a relocation. | |
1699 | ||
1700 | inline bool | |
1701 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1702 | Target_x86_64* target, | |
031cdbed | 1703 | Output_section*, |
2e30d253 | 1704 | size_t relnum, |
0ffd9845 | 1705 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1706 | unsigned int r_type, |
1707 | const Sized_symbol<64>* gsym, | |
1708 | const Symbol_value<64>* psymval, | |
1709 | unsigned char* view, | |
1710 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1711 | section_size_type view_size) |
2e30d253 ILT |
1712 | { |
1713 | if (this->skip_call_tls_get_addr_) | |
1714 | { | |
5efc7cd2 CC |
1715 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1716 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1717 | || gsym == NULL |
0ffd9845 | 1718 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1719 | { |
75f2446e ILT |
1720 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1721 | _("missing expected TLS relocation")); | |
1722 | } | |
1723 | else | |
1724 | { | |
1725 | this->skip_call_tls_get_addr_ = false; | |
1726 | return false; | |
2e30d253 | 1727 | } |
2e30d253 ILT |
1728 | } |
1729 | ||
1730 | // Pick the value to use for symbols defined in shared objects. | |
1731 | Symbol_value<64> symval; | |
96f2030e | 1732 | if (gsym != NULL |
de4c45bd ILT |
1733 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1734 | || r_type == elfcpp::R_X86_64_PC32 | |
1735 | || r_type == elfcpp::R_X86_64_PC16 | |
1736 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1737 | { |
1738 | symval.set_output_value(target->plt_section()->address() | |
1739 | + gsym->plt_offset()); | |
1740 | psymval = &symval; | |
1741 | } | |
1742 | ||
1743 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1744 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1745 | ||
1746 | // Get the GOT offset if needed. | |
96f2030e ILT |
1747 | // The GOT pointer points to the end of the GOT section. |
1748 | // We need to subtract the size of the GOT section to get | |
1749 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1750 | bool have_got_offset = false; |
1751 | unsigned int got_offset = 0; | |
1752 | switch (r_type) | |
1753 | { | |
1754 | case elfcpp::R_X86_64_GOT32: | |
1755 | case elfcpp::R_X86_64_GOT64: | |
1756 | case elfcpp::R_X86_64_GOTPLT64: | |
1757 | case elfcpp::R_X86_64_GOTPCREL: | |
1758 | case elfcpp::R_X86_64_GOTPCREL64: | |
1759 | if (gsym != NULL) | |
1760 | { | |
0a65a3a7 CC |
1761 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1762 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1763 | } |
1764 | else | |
1765 | { | |
1766 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1767 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1768 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1769 | - target->got_size()); | |
0ffd9845 ILT |
1770 | } |
1771 | have_got_offset = true; | |
1772 | break; | |
1773 | ||
1774 | default: | |
1775 | break; | |
1776 | } | |
2e30d253 ILT |
1777 | |
1778 | switch (r_type) | |
1779 | { | |
1780 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1781 | case elfcpp::R_386_GNU_VTINHERIT: |
1782 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1783 | break; |
1784 | ||
1785 | case elfcpp::R_X86_64_64: | |
1786 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1787 | break; | |
1788 | ||
1789 | case elfcpp::R_X86_64_PC64: | |
1790 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1791 | address); | |
1792 | break; | |
1793 | ||
1794 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1795 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1796 | // uint64_t x = value + addend; | |
1797 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1798 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1799 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1800 | break; | |
1801 | ||
1802 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1803 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1804 | // int64_t x = value + addend; // note this quantity is signed! | |
1805 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1806 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1807 | break; | |
1808 | ||
1809 | case elfcpp::R_X86_64_PC32: | |
1810 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1811 | address); | |
1812 | break; | |
1813 | ||
1814 | case elfcpp::R_X86_64_16: | |
1815 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1816 | break; | |
1817 | ||
1818 | case elfcpp::R_X86_64_PC16: | |
1819 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1820 | address); | |
1821 | break; | |
1822 | ||
1823 | case elfcpp::R_X86_64_8: | |
1824 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1825 | break; | |
1826 | ||
1827 | case elfcpp::R_X86_64_PC8: | |
1828 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1829 | address); | |
1830 | break; | |
1831 | ||
1832 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1833 | gold_assert(gsym == NULL |
1834 | || gsym->has_plt_offset() | |
99f8faca ILT |
1835 | || gsym->final_value_is_known() |
1836 | || (gsym->is_defined() | |
1837 | && !gsym->is_from_dynobj() | |
1838 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1839 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1840 | // behaves differently because psymval was set to point to | |
1841 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1842 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1843 | address); | |
1844 | break; | |
1845 | ||
ee9e9e86 ILT |
1846 | case elfcpp::R_X86_64_PLTOFF64: |
1847 | { | |
1848 | gold_assert(gsym); | |
1849 | gold_assert(gsym->has_plt_offset() | |
1850 | || gsym->final_value_is_known()); | |
1851 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1852 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1853 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1854 | addend - got_address); | |
ee9e9e86 ILT |
1855 | } |
1856 | ||
2e30d253 | 1857 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1858 | gold_assert(have_got_offset); |
1859 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1860 | break; |
1861 | ||
e822f2b1 ILT |
1862 | case elfcpp::R_X86_64_GOTPC32: |
1863 | { | |
1864 | gold_assert(gsym); | |
1865 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1866 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1867 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1868 | } | |
1869 | break; | |
1870 | ||
1871 | case elfcpp::R_X86_64_GOT64: | |
1872 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1873 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1874 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1875 | gold_assert(have_got_offset); |
1876 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1877 | break; |
1878 | ||
1879 | case elfcpp::R_X86_64_GOTPC64: | |
1880 | { | |
1881 | gold_assert(gsym); | |
1882 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1883 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1884 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1885 | } | |
1886 | break; | |
1887 | ||
2e30d253 ILT |
1888 | case elfcpp::R_X86_64_GOTOFF64: |
1889 | { | |
1890 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1891 | value = (psymval->value(object, 0) | |
96f2030e | 1892 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1893 | Relocate_functions<64, false>::rela64(view, value, addend); |
1894 | } | |
1895 | break; | |
1896 | ||
1897 | case elfcpp::R_X86_64_GOTPCREL: | |
1898 | { | |
0ffd9845 ILT |
1899 | gold_assert(have_got_offset); |
1900 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1901 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1902 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1903 | } |
1904 | break; | |
1905 | ||
e822f2b1 ILT |
1906 | case elfcpp::R_X86_64_GOTPCREL64: |
1907 | { | |
0ffd9845 ILT |
1908 | gold_assert(have_got_offset); |
1909 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1910 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1911 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1912 | } |
1913 | break; | |
1914 | ||
2e30d253 ILT |
1915 | case elfcpp::R_X86_64_COPY: |
1916 | case elfcpp::R_X86_64_GLOB_DAT: | |
1917 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1918 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1919 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1920 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1921 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1922 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1923 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1924 | _("unexpected reloc %u in object file"), | |
1925 | r_type); | |
2e30d253 ILT |
1926 | break; |
1927 | ||
d61c17ea | 1928 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1929 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1930 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1931 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1932 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1933 | case elfcpp::R_X86_64_DTPOFF32: |
1934 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1935 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1936 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1937 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1938 | view, address, view_size); | |
2e30d253 | 1939 | break; |
2e30d253 | 1940 | |
fdc2f80f ILT |
1941 | case elfcpp::R_X86_64_SIZE32: |
1942 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1943 | default: |
75f2446e ILT |
1944 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1945 | _("unsupported reloc %u"), | |
1946 | r_type); | |
2e30d253 ILT |
1947 | break; |
1948 | } | |
1949 | ||
1950 | return true; | |
1951 | } | |
1952 | ||
1953 | // Perform a TLS relocation. | |
1954 | ||
1955 | inline void | |
d61c17ea | 1956 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1957 | Target_x86_64* target, |
d61c17ea | 1958 | size_t relnum, |
72ec2876 | 1959 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1960 | unsigned int r_type, |
1961 | const Sized_symbol<64>* gsym, | |
1962 | const Symbol_value<64>* psymval, | |
1963 | unsigned char* view, | |
6a41d30b | 1964 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1965 | section_size_type view_size) |
2e30d253 | 1966 | { |
2e30d253 | 1967 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1968 | |
1969 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1970 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1971 | |
1972 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1973 | ||
1974 | const bool is_final = (gsym == NULL | |
8851ecca | 1975 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1976 | : gsym->final_value_is_known()); |
e041f13d ILT |
1977 | const tls::Tls_optimization optimized_type |
1978 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1979 | switch (r_type) |
1980 | { | |
56622147 | 1981 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 1982 | this->saw_tls_block_reloc_ = true; |
e041f13d | 1983 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1984 | { |
7bf1f802 | 1985 | gold_assert(tls_segment != NULL); |
2e30d253 | 1986 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1987 | rela, r_type, value, view, |
2e30d253 ILT |
1988 | view_size); |
1989 | break; | |
1990 | } | |
7bf1f802 ILT |
1991 | else |
1992 | { | |
c2b45e22 CC |
1993 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1994 | ? GOT_TYPE_TLS_OFFSET | |
1995 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
1996 | unsigned int got_offset; |
1997 | if (gsym != NULL) | |
1998 | { | |
c2b45e22 CC |
1999 | gold_assert(gsym->has_got_offset(got_type)); |
2000 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2001 | } |
2002 | else | |
2003 | { | |
2004 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2005 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2006 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2007 | - target->got_size()); |
2008 | } | |
2009 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2010 | { | |
2011 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2012 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2013 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2014 | value, view, address, view_size); |
7bf1f802 ILT |
2015 | break; |
2016 | } | |
2017 | else if (optimized_type == tls::TLSOPT_NONE) | |
2018 | { | |
2019 | // Relocate the field with the offset of the pair of GOT | |
2020 | // entries. | |
6a41d30b ILT |
2021 | value = target->got_plt_section()->address() + got_offset; |
2022 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2023 | address); | |
7bf1f802 ILT |
2024 | break; |
2025 | } | |
2026 | } | |
72ec2876 | 2027 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2028 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2029 | break; |
2030 | ||
c2b45e22 CC |
2031 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2032 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2033 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2034 | if (optimized_type == tls::TLSOPT_TO_LE) |
2035 | { | |
2036 | gold_assert(tls_segment != NULL); | |
2037 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2038 | rela, r_type, value, view, | |
2039 | view_size); | |
2040 | break; | |
2041 | } | |
2042 | else | |
2043 | { | |
2044 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2045 | ? GOT_TYPE_TLS_OFFSET | |
2046 | : GOT_TYPE_TLS_DESC); | |
2047 | unsigned int got_offset; | |
2048 | if (gsym != NULL) | |
2049 | { | |
2050 | gold_assert(gsym->has_got_offset(got_type)); | |
2051 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2052 | } | |
2053 | else | |
2054 | { | |
2055 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2056 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2057 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2058 | - target->got_size()); | |
2059 | } | |
2060 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2061 | { | |
2062 | gold_assert(tls_segment != NULL); | |
2063 | value = target->got_plt_section()->address() + got_offset; | |
2064 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2065 | rela, r_type, value, view, address, | |
2066 | view_size); | |
2067 | break; | |
2068 | } | |
2069 | else if (optimized_type == tls::TLSOPT_NONE) | |
2070 | { | |
2071 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2072 | { | |
2073 | // Relocate the field with the offset of the pair of GOT | |
2074 | // entries. | |
2075 | value = target->got_plt_section()->address() + got_offset; | |
2076 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2077 | address); | |
2078 | } | |
2079 | break; | |
2080 | } | |
2081 | } | |
2082 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2083 | _("unsupported reloc %u"), r_type); | |
2084 | break; | |
2085 | ||
56622147 | 2086 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2087 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2088 | if (optimized_type == tls::TLSOPT_TO_LE) |
2089 | { | |
7bf1f802 | 2090 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2091 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2092 | value, view, view_size); | |
2093 | break; | |
e041f13d | 2094 | } |
7bf1f802 ILT |
2095 | else if (optimized_type == tls::TLSOPT_NONE) |
2096 | { | |
2097 | // Relocate the field with the offset of the GOT entry for | |
2098 | // the module index. | |
2099 | unsigned int got_offset; | |
31d60480 ILT |
2100 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2101 | - target->got_size()); | |
6a41d30b ILT |
2102 | value = target->got_plt_section()->address() + got_offset; |
2103 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2104 | address); | |
7bf1f802 ILT |
2105 | break; |
2106 | } | |
72ec2876 | 2107 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2108 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2109 | break; |
0ffd9845 ILT |
2110 | |
2111 | case elfcpp::R_X86_64_DTPOFF32: | |
e041f13d | 2112 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2113 | { |
2114 | // This relocation type is used in debugging information. | |
2115 | // In that case we need to not optimize the value. If we | |
2116 | // haven't seen a TLSLD reloc, then we assume we should not | |
2117 | // optimize this reloc. | |
2118 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2119 | { |
2120 | gold_assert(tls_segment != NULL); | |
2121 | value -= tls_segment->memsz(); | |
2122 | } | |
497897f9 | 2123 | } |
d85c80a3 | 2124 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2125 | break; |
2126 | ||
2127 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d | 2128 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2129 | { |
2130 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2131 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2132 | { |
2133 | gold_assert(tls_segment != NULL); | |
2134 | value -= tls_segment->memsz(); | |
2135 | } | |
497897f9 | 2136 | } |
d85c80a3 | 2137 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2138 | break; |
2e30d253 | 2139 | |
56622147 ILT |
2140 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2141 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2142 | { | |
7bf1f802 | 2143 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2144 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2145 | rela, r_type, value, view, | |
2146 | view_size); | |
2147 | break; | |
2148 | } | |
7bf1f802 ILT |
2149 | else if (optimized_type == tls::TLSOPT_NONE) |
2150 | { | |
2151 | // Relocate the field with the offset of the GOT entry for | |
2152 | // the tp-relative offset of the symbol. | |
2153 | unsigned int got_offset; | |
2154 | if (gsym != NULL) | |
2155 | { | |
0a65a3a7 CC |
2156 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2157 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2158 | - target->got_size()); | |
7bf1f802 ILT |
2159 | } |
2160 | else | |
2161 | { | |
2162 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2163 | gold_assert(object->local_has_got_offset(r_sym, |
2164 | GOT_TYPE_TLS_OFFSET)); | |
2165 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2166 | - target->got_size()); |
2167 | } | |
6a41d30b ILT |
2168 | value = target->got_plt_section()->address() + got_offset; |
2169 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2170 | break; |
2171 | } | |
56622147 ILT |
2172 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2173 | _("unsupported reloc type %u"), | |
2174 | r_type); | |
2175 | break; | |
0ffd9845 | 2176 | |
56622147 | 2177 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2178 | value -= tls_segment->memsz(); |
d85c80a3 | 2179 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2180 | break; |
2e30d253 | 2181 | } |
2e30d253 ILT |
2182 | } |
2183 | ||
7bf1f802 ILT |
2184 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2185 | // Initial-Exec. | |
2186 | ||
2187 | inline void | |
2188 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2189 | size_t relnum, | |
c2b45e22 | 2190 | Output_segment*, |
7bf1f802 ILT |
2191 | const elfcpp::Rela<64, false>& rela, |
2192 | unsigned int, | |
2193 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2194 | unsigned char* view, | |
c2b45e22 | 2195 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2196 | section_size_type view_size) |
7bf1f802 ILT |
2197 | { |
2198 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2199 | // .word 0x6666; rex64; call __tls_get_addr | |
2200 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2201 | ||
2202 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2203 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2204 | ||
2205 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2206 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2207 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2208 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2209 | ||
2210 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2211 | ||
c2b45e22 CC |
2212 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2213 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2214 | |
2215 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2216 | // We can skip it. | |
2217 | this->skip_call_tls_get_addr_ = true; | |
2218 | } | |
2219 | ||
e041f13d | 2220 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2221 | // Local-Exec. |
2222 | ||
2223 | inline void | |
d61c17ea ILT |
2224 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2225 | size_t relnum, | |
2226 | Output_segment* tls_segment, | |
72ec2876 | 2227 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2228 | unsigned int, |
2229 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2230 | unsigned char* view, | |
fe8718a4 | 2231 | section_size_type view_size) |
2e30d253 | 2232 | { |
0ffd9845 ILT |
2233 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2234 | // .word 0x6666; rex64; call __tls_get_addr | |
2235 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2236 | |
72ec2876 ILT |
2237 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2238 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2239 | |
72ec2876 ILT |
2240 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2241 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2242 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2243 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2244 | |
0ffd9845 | 2245 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2246 | |
6a41d30b | 2247 | value -= tls_segment->memsz(); |
0ffd9845 | 2248 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2249 | |
2250 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2251 | // We can skip it. | |
2252 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2253 | } |
2254 | ||
c2b45e22 CC |
2255 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2256 | ||
2257 | inline void | |
2258 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2259 | const Relocate_info<64, false>* relinfo, | |
2260 | size_t relnum, | |
2261 | Output_segment*, | |
2262 | const elfcpp::Rela<64, false>& rela, | |
2263 | unsigned int r_type, | |
2264 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2265 | unsigned char* view, | |
2266 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2267 | section_size_type view_size) | |
2268 | { | |
2269 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2270 | { | |
2271 | // leaq foo@tlsdesc(%rip), %rax | |
2272 | // ==> movq foo@gottpoff(%rip), %rax | |
2273 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2274 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2275 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2276 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2277 | view[-2] = 0x8b; | |
2278 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2279 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2280 | } | |
2281 | else | |
2282 | { | |
2283 | // call *foo@tlscall(%rax) | |
2284 | // ==> nop; nop | |
2285 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2286 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2287 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2288 | view[0] == 0xff && view[1] == 0x10); | |
2289 | view[0] = 0x66; | |
2290 | view[1] = 0x90; | |
2291 | } | |
2292 | } | |
2293 | ||
2294 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2295 | ||
2296 | inline void | |
2297 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2298 | const Relocate_info<64, false>* relinfo, | |
2299 | size_t relnum, | |
2300 | Output_segment* tls_segment, | |
2301 | const elfcpp::Rela<64, false>& rela, | |
2302 | unsigned int r_type, | |
2303 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2304 | unsigned char* view, | |
2305 | section_size_type view_size) | |
2306 | { | |
2307 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2308 | { | |
2309 | // leaq foo@tlsdesc(%rip), %rax | |
2310 | // ==> movq foo@tpoff, %rax | |
2311 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2312 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2313 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2314 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2315 | view[-2] = 0xc7; | |
2316 | view[-1] = 0xc0; | |
2317 | value -= tls_segment->memsz(); | |
2318 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2319 | } | |
2320 | else | |
2321 | { | |
2322 | // call *foo@tlscall(%rax) | |
2323 | // ==> nop; nop | |
2324 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2325 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2326 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2327 | view[0] == 0xff && view[1] == 0x10); | |
2328 | view[0] = 0x66; | |
2329 | view[1] = 0x90; | |
2330 | } | |
2331 | } | |
2332 | ||
2e30d253 | 2333 | inline void |
72ec2876 ILT |
2334 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2335 | size_t relnum, | |
2336 | Output_segment*, | |
2337 | const elfcpp::Rela<64, false>& rela, | |
2338 | unsigned int, | |
2339 | elfcpp::Elf_types<64>::Elf_Addr, | |
2340 | unsigned char* view, | |
fe8718a4 | 2341 | section_size_type view_size) |
2e30d253 | 2342 | { |
72ec2876 ILT |
2343 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2344 | // ... leq foo@dtpoff(%rax),%reg | |
2345 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2346 | |
72ec2876 ILT |
2347 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2348 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2349 | |
72ec2876 ILT |
2350 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2351 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2352 | ||
2353 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2354 | ||
2355 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2356 | ||
2357 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2358 | // We can skip it. | |
2359 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2360 | } |
2361 | ||
56622147 ILT |
2362 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2363 | // Local-Exec. | |
2364 | ||
2365 | inline void | |
2366 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2367 | size_t relnum, | |
2368 | Output_segment* tls_segment, | |
2369 | const elfcpp::Rela<64, false>& rela, | |
2370 | unsigned int, | |
2371 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2372 | unsigned char* view, | |
fe8718a4 | 2373 | section_size_type view_size) |
56622147 ILT |
2374 | { |
2375 | // We need to examine the opcodes to figure out which instruction we | |
2376 | // are looking at. | |
2377 | ||
2378 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2379 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2380 | ||
2381 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2382 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2383 | ||
2384 | unsigned char op1 = view[-3]; | |
2385 | unsigned char op2 = view[-2]; | |
2386 | unsigned char op3 = view[-1]; | |
2387 | unsigned char reg = op3 >> 3; | |
2388 | ||
2389 | if (op2 == 0x8b) | |
2390 | { | |
2391 | // movq | |
2392 | if (op1 == 0x4c) | |
2393 | view[-3] = 0x49; | |
2394 | view[-2] = 0xc7; | |
2395 | view[-1] = 0xc0 | reg; | |
2396 | } | |
2397 | else if (reg == 4) | |
2398 | { | |
2399 | // Special handling for %rsp. | |
2400 | if (op1 == 0x4c) | |
2401 | view[-3] = 0x49; | |
2402 | view[-2] = 0x81; | |
2403 | view[-1] = 0xc0 | reg; | |
2404 | } | |
2405 | else | |
2406 | { | |
2407 | // addq | |
2408 | if (op1 == 0x4c) | |
2409 | view[-3] = 0x4d; | |
2410 | view[-2] = 0x8d; | |
2411 | view[-1] = 0x80 | reg | (reg << 3); | |
2412 | } | |
2413 | ||
6a41d30b | 2414 | value -= tls_segment->memsz(); |
56622147 ILT |
2415 | Relocate_functions<64, false>::rela32(view, value, 0); |
2416 | } | |
2417 | ||
2e30d253 ILT |
2418 | // Relocate section data. |
2419 | ||
2420 | void | |
364c7fa5 ILT |
2421 | Target_x86_64::relocate_section( |
2422 | const Relocate_info<64, false>* relinfo, | |
2423 | unsigned int sh_type, | |
2424 | const unsigned char* prelocs, | |
2425 | size_t reloc_count, | |
2426 | Output_section* output_section, | |
2427 | bool needs_special_offset_handling, | |
2428 | unsigned char* view, | |
2429 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2430 | section_size_type view_size, | |
2431 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2432 | { |
2433 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2434 | ||
2435 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2436 | Target_x86_64::Relocate>( | |
2437 | relinfo, | |
2438 | this, | |
2439 | prelocs, | |
2440 | reloc_count, | |
730cdc88 ILT |
2441 | output_section, |
2442 | needs_special_offset_handling, | |
2e30d253 ILT |
2443 | view, |
2444 | address, | |
364c7fa5 ILT |
2445 | view_size, |
2446 | reloc_symbol_changes); | |
2e30d253 ILT |
2447 | } |
2448 | ||
6a74a719 ILT |
2449 | // Return the size of a relocation while scanning during a relocatable |
2450 | // link. | |
2451 | ||
2452 | unsigned int | |
2453 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2454 | unsigned int r_type, | |
2455 | Relobj* object) | |
2456 | { | |
2457 | switch (r_type) | |
2458 | { | |
2459 | case elfcpp::R_X86_64_NONE: | |
2460 | case elfcpp::R_386_GNU_VTINHERIT: | |
2461 | case elfcpp::R_386_GNU_VTENTRY: | |
2462 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2463 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2464 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2465 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2466 | case elfcpp::R_X86_64_DTPOFF32: | |
2467 | case elfcpp::R_X86_64_DTPOFF64: | |
2468 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2469 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2470 | return 0; | |
2471 | ||
2472 | case elfcpp::R_X86_64_64: | |
2473 | case elfcpp::R_X86_64_PC64: | |
2474 | case elfcpp::R_X86_64_GOTOFF64: | |
2475 | case elfcpp::R_X86_64_GOTPC64: | |
2476 | case elfcpp::R_X86_64_PLTOFF64: | |
2477 | case elfcpp::R_X86_64_GOT64: | |
2478 | case elfcpp::R_X86_64_GOTPCREL64: | |
2479 | case elfcpp::R_X86_64_GOTPCREL: | |
2480 | case elfcpp::R_X86_64_GOTPLT64: | |
2481 | return 8; | |
2482 | ||
2483 | case elfcpp::R_X86_64_32: | |
2484 | case elfcpp::R_X86_64_32S: | |
2485 | case elfcpp::R_X86_64_PC32: | |
2486 | case elfcpp::R_X86_64_PLT32: | |
2487 | case elfcpp::R_X86_64_GOTPC32: | |
2488 | case elfcpp::R_X86_64_GOT32: | |
2489 | return 4; | |
2490 | ||
2491 | case elfcpp::R_X86_64_16: | |
2492 | case elfcpp::R_X86_64_PC16: | |
2493 | return 2; | |
2494 | ||
2495 | case elfcpp::R_X86_64_8: | |
2496 | case elfcpp::R_X86_64_PC8: | |
2497 | return 1; | |
2498 | ||
2499 | case elfcpp::R_X86_64_COPY: | |
2500 | case elfcpp::R_X86_64_GLOB_DAT: | |
2501 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2502 | case elfcpp::R_X86_64_RELATIVE: | |
2503 | // These are outstanding tls relocs, which are unexpected when linking | |
2504 | case elfcpp::R_X86_64_TPOFF64: | |
2505 | case elfcpp::R_X86_64_DTPMOD64: | |
2506 | case elfcpp::R_X86_64_TLSDESC: | |
2507 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2508 | return 0; | |
2509 | ||
2510 | case elfcpp::R_X86_64_SIZE32: | |
2511 | case elfcpp::R_X86_64_SIZE64: | |
2512 | default: | |
2513 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2514 | return 0; | |
2515 | } | |
2516 | } | |
2517 | ||
2518 | // Scan the relocs during a relocatable link. | |
2519 | ||
2520 | void | |
ad0f2072 | 2521 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2522 | Layout* layout, |
2523 | Sized_relobj<64, false>* object, | |
2524 | unsigned int data_shndx, | |
2525 | unsigned int sh_type, | |
2526 | const unsigned char* prelocs, | |
2527 | size_t reloc_count, | |
2528 | Output_section* output_section, | |
2529 | bool needs_special_offset_handling, | |
2530 | size_t local_symbol_count, | |
2531 | const unsigned char* plocal_symbols, | |
2532 | Relocatable_relocs* rr) | |
2533 | { | |
2534 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2535 | ||
2536 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2537 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2538 | ||
7019cd25 | 2539 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 2540 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2541 | symtab, |
2542 | layout, | |
2543 | object, | |
2544 | data_shndx, | |
2545 | prelocs, | |
2546 | reloc_count, | |
2547 | output_section, | |
2548 | needs_special_offset_handling, | |
2549 | local_symbol_count, | |
2550 | plocal_symbols, | |
2551 | rr); | |
2552 | } | |
2553 | ||
2554 | // Relocate a section during a relocatable link. | |
2555 | ||
2556 | void | |
2557 | Target_x86_64::relocate_for_relocatable( | |
2558 | const Relocate_info<64, false>* relinfo, | |
2559 | unsigned int sh_type, | |
2560 | const unsigned char* prelocs, | |
2561 | size_t reloc_count, | |
2562 | Output_section* output_section, | |
2563 | off_t offset_in_output_section, | |
2564 | const Relocatable_relocs* rr, | |
2565 | unsigned char* view, | |
2566 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2567 | section_size_type view_size, | |
2568 | unsigned char* reloc_view, | |
2569 | section_size_type reloc_view_size) | |
2570 | { | |
2571 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2572 | ||
7019cd25 | 2573 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2574 | relinfo, |
2575 | prelocs, | |
2576 | reloc_count, | |
2577 | output_section, | |
2578 | offset_in_output_section, | |
2579 | rr, | |
2580 | view, | |
2581 | view_address, | |
2582 | view_size, | |
2583 | reloc_view, | |
2584 | reloc_view_size); | |
2585 | } | |
2586 | ||
4fb6c25d ILT |
2587 | // Return the value to use for a dynamic which requires special |
2588 | // treatment. This is how we support equality comparisons of function | |
2589 | // pointers across shared library boundaries, as described in the | |
2590 | // processor specific ABI supplement. | |
2591 | ||
2592 | uint64_t | |
2593 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2594 | { | |
2595 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2596 | return this->plt_section()->address() + gsym->plt_offset(); | |
2597 | } | |
2598 | ||
2e30d253 ILT |
2599 | // Return a string used to fill a code section with nops to take up |
2600 | // the specified length. | |
2601 | ||
2602 | std::string | |
8851ecca | 2603 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2604 | { |
2605 | if (length >= 16) | |
2606 | { | |
2607 | // Build a jmpq instruction to skip over the bytes. | |
2608 | unsigned char jmp[5]; | |
2609 | jmp[0] = 0xe9; | |
04bf7072 | 2610 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2611 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2612 | + std::string(length - 5, '\0')); | |
2613 | } | |
2614 | ||
2615 | // Nop sequences of various lengths. | |
2616 | const char nop1[1] = { 0x90 }; // nop | |
2617 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2618 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2619 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2620 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2621 | 0x00 }; | |
2622 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2623 | 0x00, 0x00 }; |
1caf2c51 | 2624 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2625 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2626 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2627 | 0x00, 0x00, 0x00, 0x00 }; | |
2628 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2629 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2630 | 0x00 }; |
1caf2c51 ILT |
2631 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2632 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2633 | 0x00, 0x00 }; |
1caf2c51 ILT |
2634 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2635 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2636 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2637 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2638 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2639 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2640 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2641 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2642 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2643 | 0x00 }; |
1caf2c51 ILT |
2644 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2645 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2646 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2647 | 0x00, 0x00 }; |
1caf2c51 ILT |
2648 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2649 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2650 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2651 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2652 | |
2653 | const char* nops[16] = { | |
2654 | NULL, | |
2655 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2656 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2657 | }; | |
2658 | ||
2659 | return std::string(nops[length], length); | |
2660 | } | |
2661 | ||
364c7fa5 ILT |
2662 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2663 | // compiled with -fstack-split. The function calls non-stack-split | |
2664 | // code. We have to change the function so that it always ensures | |
2665 | // that it has enough stack space to run some random function. | |
2666 | ||
2667 | void | |
2668 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2669 | section_offset_type fnoffset, | |
2670 | section_size_type fnsize, | |
2671 | unsigned char* view, | |
2672 | section_size_type view_size, | |
2673 | std::string* from, | |
2674 | std::string* to) const | |
2675 | { | |
2676 | // The function starts with a comparison of the stack pointer and a | |
2677 | // field in the TCB. This is followed by a jump. | |
2678 | ||
2679 | // cmp %fs:NN,%rsp | |
2680 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
2681 | && fnsize > 9) | |
2682 | { | |
2683 | // We will call __morestack if the carry flag is set after this | |
2684 | // comparison. We turn the comparison into an stc instruction | |
2685 | // and some nops. | |
2686 | view[fnoffset] = '\xf9'; | |
2687 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
2688 | } | |
2689 | // lea NN(%rsp),%r10 | |
2690 | else if (this->match_view(view, view_size, fnoffset, "\x4c\x8d\x94\x24", 4) | |
2691 | && fnsize > 8) | |
2692 | { | |
2693 | // This is loading an offset from the stack pointer for a | |
2694 | // comparison. The offset is negative, so we decrease the | |
2695 | // offset by the amount of space we need for the stack. This | |
2696 | // means we will avoid calling __morestack if there happens to | |
2697 | // be plenty of space on the stack already. | |
2698 | unsigned char* pval = view + fnoffset + 4; | |
2699 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2700 | val -= parameters->options().split_stack_adjust_size(); | |
2701 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2702 | } | |
2703 | else | |
2704 | { | |
2705 | if (!object->has_no_split_stack()) | |
2706 | object->error(_("failed to match split-stack sequence at " | |
2707 | "section %u offset %0zx"), | |
2708 | shndx, fnoffset); | |
2709 | return; | |
2710 | } | |
2711 | ||
2712 | // We have to change the function so that it calls | |
2713 | // __morestack_non_split instead of __morestack. The former will | |
2714 | // allocate additional stack space. | |
2715 | *from = "__morestack"; | |
2716 | *to = "__morestack_non_split"; | |
2717 | } | |
2718 | ||
2e30d253 ILT |
2719 | // The selector for x86_64 object files. |
2720 | ||
36959681 | 2721 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
2722 | { |
2723 | public: | |
2724 | Target_selector_x86_64() | |
36959681 ILT |
2725 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
2726 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
2727 | { } |
2728 | ||
2729 | Target* | |
e96caa79 ILT |
2730 | do_instantiate_target() |
2731 | { return new Target_x86_64(); } | |
36959681 | 2732 | |
2e30d253 ILT |
2733 | }; |
2734 | ||
2e30d253 ILT |
2735 | Target_selector_x86_64 target_selector_x86_64; |
2736 | ||
2737 | } // End anonymous namespace. |