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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 | |
f59f41f3 | 105 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
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 | |
05a352e6 DK |
442 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
443 | NULL, // attributes_section | |
444 | NULL // attributes_vendor | |
2e30d253 ILT |
445 | }; |
446 | ||
8a5e3e08 ILT |
447 | // This is called when a new output section is created. This is where |
448 | // we handle the SHF_X86_64_LARGE. | |
449 | ||
450 | void | |
451 | Target_x86_64::do_new_output_section(Output_section *os) const | |
452 | { | |
453 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
454 | os->set_is_large_section(); | |
455 | } | |
456 | ||
2e30d253 ILT |
457 | // Get the GOT section, creating it if necessary. |
458 | ||
459 | Output_data_got<64, false>* | |
460 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
461 | { | |
462 | if (this->got_ == NULL) | |
463 | { | |
464 | gold_assert(symtab != NULL && layout != NULL); | |
465 | ||
466 | this->got_ = new Output_data_got<64, false>(); | |
467 | ||
9f1d377b ILT |
468 | Output_section* os; |
469 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
470 | (elfcpp::SHF_ALLOC | |
471 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 472 | this->got_, false); |
9f1d377b | 473 | os->set_is_relro(); |
2e30d253 ILT |
474 | |
475 | // The old GNU linker creates a .got.plt section. We just | |
476 | // create another set of data in the .got section. Note that we | |
477 | // always create a PLT if we create a GOT, although the PLT | |
478 | // might be empty. | |
7d9e3d98 | 479 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
9f1d377b ILT |
480 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
481 | (elfcpp::SHF_ALLOC | |
482 | | elfcpp::SHF_WRITE), | |
f5c870d2 | 483 | this->got_plt_, false); |
9f1d377b | 484 | os->set_is_relro(); |
2e30d253 ILT |
485 | |
486 | // The first three entries are reserved. | |
27bc2bce | 487 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
488 | |
489 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 490 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
99fff23b | 491 | Symbol_table::PREDEFINED, |
2e30d253 ILT |
492 | this->got_plt_, |
493 | 0, 0, elfcpp::STT_OBJECT, | |
494 | elfcpp::STB_LOCAL, | |
495 | elfcpp::STV_HIDDEN, 0, | |
496 | false, false); | |
497 | } | |
498 | ||
499 | return this->got_; | |
500 | } | |
501 | ||
502 | // Get the dynamic reloc section, creating it if necessary. | |
503 | ||
504 | Target_x86_64::Reloc_section* | |
0ffd9845 | 505 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 506 | { |
0ffd9845 | 507 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
508 | { |
509 | gold_assert(layout != NULL); | |
d98bc257 | 510 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 511 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
f5c870d2 | 512 | elfcpp::SHF_ALLOC, this->rela_dyn_, true); |
2e30d253 | 513 | } |
0ffd9845 | 514 | return this->rela_dyn_; |
2e30d253 ILT |
515 | } |
516 | ||
517 | // A class to handle the PLT data. | |
518 | ||
519 | class Output_data_plt_x86_64 : public Output_section_data | |
520 | { | |
521 | public: | |
522 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
523 | ||
c2b45e22 CC |
524 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
525 | Output_data_space*); | |
2e30d253 ILT |
526 | |
527 | // Add an entry to the PLT. | |
528 | void | |
529 | add_entry(Symbol* gsym); | |
530 | ||
c2b45e22 CC |
531 | // Add the reserved TLSDESC_PLT entry to the PLT. |
532 | void | |
533 | reserve_tlsdesc_entry(unsigned int got_offset) | |
534 | { this->tlsdesc_got_offset_ = got_offset; } | |
535 | ||
536 | // Return true if a TLSDESC_PLT entry has been reserved. | |
537 | bool | |
538 | has_tlsdesc_entry() const | |
539 | { return this->tlsdesc_got_offset_ != -1U; } | |
540 | ||
541 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
542 | unsigned int | |
543 | get_tlsdesc_got_offset() const | |
544 | { return this->tlsdesc_got_offset_; } | |
545 | ||
546 | // Return the offset of the reserved TLSDESC_PLT entry. | |
547 | unsigned int | |
548 | get_tlsdesc_plt_offset() const | |
549 | { return (this->count_ + 1) * plt_entry_size; } | |
550 | ||
2e30d253 ILT |
551 | // Return the .rel.plt section data. |
552 | const Reloc_section* | |
553 | rel_plt() const | |
554 | { return this->rel_; } | |
555 | ||
556 | protected: | |
557 | void | |
558 | do_adjust_output_section(Output_section* os); | |
559 | ||
7d9e3d98 ILT |
560 | // Write to a map file. |
561 | void | |
562 | do_print_to_mapfile(Mapfile* mapfile) const | |
563 | { mapfile->print_output_data(this, _("** PLT")); } | |
564 | ||
2e30d253 ILT |
565 | private: |
566 | // The size of an entry in the PLT. | |
567 | static const int plt_entry_size = 16; | |
568 | ||
569 | // The first entry in the PLT. | |
570 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
571 | // procedure linkage table for both programs and shared objects." | |
572 | static unsigned char first_plt_entry[plt_entry_size]; | |
573 | ||
574 | // Other entries in the PLT for an executable. | |
575 | static unsigned char plt_entry[plt_entry_size]; | |
576 | ||
c2b45e22 CC |
577 | // The reserved TLSDESC entry in the PLT for an executable. |
578 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
579 | ||
2e30d253 ILT |
580 | // Set the final size. |
581 | void | |
c2b45e22 | 582 | set_final_data_size(); |
2e30d253 ILT |
583 | |
584 | // Write out the PLT data. | |
585 | void | |
586 | do_write(Output_file*); | |
587 | ||
588 | // The reloc section. | |
589 | Reloc_section* rel_; | |
c2b45e22 CC |
590 | // The .got section. |
591 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
592 | // The .got.plt section. |
593 | Output_data_space* got_plt_; | |
594 | // The number of PLT entries. | |
595 | unsigned int count_; | |
c2b45e22 CC |
596 | // Offset of the reserved TLSDESC_GOT entry when needed. |
597 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
598 | }; |
599 | ||
600 | // Create the PLT section. The ordinary .got section is an argument, | |
601 | // since we need to refer to the start. We also create our own .got | |
602 | // section just for PLT entries. | |
603 | ||
604 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 605 | Output_data_got<64, false>* got, |
2e30d253 | 606 | Output_data_space* got_plt) |
c2b45e22 CC |
607 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
608 | tlsdesc_got_offset_(-1U) | |
2e30d253 | 609 | { |
d98bc257 | 610 | this->rel_ = new Reloc_section(false); |
2e30d253 | 611 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
f5c870d2 | 612 | elfcpp::SHF_ALLOC, this->rel_, true); |
2e30d253 ILT |
613 | } |
614 | ||
615 | void | |
616 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
617 | { | |
b0481b0b | 618 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
619 | } |
620 | ||
621 | // Add an entry to the PLT. | |
622 | ||
623 | void | |
624 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
625 | { | |
626 | gold_assert(!gsym->has_plt_offset()); | |
627 | ||
628 | // Note that when setting the PLT offset we skip the initial | |
629 | // reserved PLT entry. | |
630 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
631 | ||
632 | ++this->count_; | |
633 | ||
fe8718a4 | 634 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
635 | |
636 | // Every PLT entry needs a GOT entry which points back to the PLT | |
637 | // entry (this will be changed by the dynamic linker, normally | |
638 | // lazily when the function is called). | |
27bc2bce | 639 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
640 | |
641 | // Every PLT entry needs a reloc. | |
642 | gsym->set_needs_dynsym_entry(); | |
643 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
644 | got_offset, 0); | |
645 | ||
646 | // Note that we don't need to save the symbol. The contents of the | |
647 | // PLT are independent of which symbols are used. The symbols only | |
648 | // appear in the relocations. | |
649 | } | |
650 | ||
c2b45e22 CC |
651 | // Set the final size. |
652 | void | |
653 | Output_data_plt_x86_64::set_final_data_size() | |
654 | { | |
655 | unsigned int count = this->count_; | |
656 | if (this->has_tlsdesc_entry()) | |
657 | ++count; | |
658 | this->set_data_size((count + 1) * plt_entry_size); | |
659 | } | |
660 | ||
2e30d253 ILT |
661 | // The first entry in the PLT for an executable. |
662 | ||
663 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
664 | { | |
665 | // From AMD64 ABI Draft 0.98, page 76 | |
666 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 667 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
668 | 0xff, 0x25, // jmp indirect |
669 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
670 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
671 | }; | |
672 | ||
673 | // Subsequent entries in the PLT for an executable. | |
674 | ||
675 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
676 | { | |
677 | // From AMD64 ABI Draft 0.98, page 76 | |
678 | 0xff, 0x25, // jmpq indirect | |
679 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
680 | 0x68, // pushq immediate | |
681 | 0, 0, 0, 0, // replaced with offset into relocation table | |
682 | 0xe9, // jmpq relative | |
683 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
684 | }; | |
685 | ||
c2b45e22 CC |
686 | // The reserved TLSDESC entry in the PLT for an executable. |
687 | ||
688 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
689 | { | |
690 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
691 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
692 | 0xff, 0x35, // pushq x(%rip) | |
693 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
694 | 0xff, 0x25, // jmpq *y(%rip) | |
695 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
696 | 0x0f, 0x1f, // nop | |
697 | 0x40, 0 | |
698 | }; | |
699 | ||
2e30d253 ILT |
700 | // Write out the PLT. This uses the hand-coded instructions above, |
701 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
702 | ||
703 | void | |
704 | Output_data_plt_x86_64::do_write(Output_file* of) | |
705 | { | |
2ea97941 | 706 | const off_t offset = this->offset(); |
fe8718a4 ILT |
707 | const section_size_type oview_size = |
708 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 709 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
710 | |
711 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
712 | const section_size_type got_size = |
713 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
714 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
715 | got_size); | |
716 | ||
717 | unsigned char* pov = oview; | |
718 | ||
c2b45e22 | 719 | // The base address of the .plt section. |
a984ee1d | 720 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 721 | // The base address of the .got section. |
a984ee1d | 722 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
723 | // The base address of the PLT portion of the .got section, |
724 | // which is where the GOT pointer will point, and where the | |
725 | // three reserved GOT entries are located. | |
a984ee1d | 726 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
727 | |
728 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 729 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
730 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
731 | (got_address + 8 | |
732 | - (plt_address + 6))); | |
733 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
734 | (got_address + 16 | |
735 | - (plt_address + 12))); | |
2e30d253 ILT |
736 | pov += plt_entry_size; |
737 | ||
738 | unsigned char* got_pov = got_view; | |
739 | ||
740 | memset(got_pov, 0, 24); | |
741 | got_pov += 24; | |
742 | ||
743 | unsigned int plt_offset = plt_entry_size; | |
744 | unsigned int got_offset = 24; | |
745 | const unsigned int count = this->count_; | |
746 | for (unsigned int plt_index = 0; | |
747 | plt_index < count; | |
748 | ++plt_index, | |
749 | pov += plt_entry_size, | |
750 | got_pov += 8, | |
751 | plt_offset += plt_entry_size, | |
752 | got_offset += 8) | |
753 | { | |
754 | // Set and adjust the PLT entry itself. | |
755 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
756 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
757 | (got_address + got_offset | |
758 | - (plt_address + plt_offset | |
759 | + 6))); | |
2e30d253 ILT |
760 | |
761 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
762 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
763 | - (plt_offset + plt_entry_size)); | |
764 | ||
765 | // Set the entry in the GOT. | |
766 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
767 | } | |
768 | ||
c2b45e22 CC |
769 | if (this->has_tlsdesc_entry()) |
770 | { | |
771 | // Set and adjust the reserved TLSDESC PLT entry. | |
772 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
773 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
774 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
775 | (got_address + 8 | |
776 | - (plt_address + plt_offset | |
777 | + 6))); | |
778 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
779 | (got_base | |
780 | + tlsdesc_got_offset | |
781 | - (plt_address + plt_offset | |
782 | + 12))); | |
783 | pov += plt_entry_size; | |
784 | } | |
785 | ||
fe8718a4 ILT |
786 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
787 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 788 | |
2ea97941 | 789 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
790 | of->write_output_view(got_file_offset, got_size, got_view); |
791 | } | |
792 | ||
c2b45e22 | 793 | // Create the PLT section. |
2e30d253 ILT |
794 | |
795 | void | |
c2b45e22 | 796 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 797 | { |
2e30d253 ILT |
798 | if (this->plt_ == NULL) |
799 | { | |
800 | // Create the GOT sections first. | |
801 | this->got_section(symtab, layout); | |
802 | ||
c2b45e22 CC |
803 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
804 | this->got_plt_); | |
2e30d253 ILT |
805 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
806 | (elfcpp::SHF_ALLOC | |
807 | | elfcpp::SHF_EXECINSTR), | |
f5c870d2 | 808 | this->plt_, false); |
2e30d253 | 809 | } |
c2b45e22 CC |
810 | } |
811 | ||
812 | // Create a PLT entry for a global symbol. | |
813 | ||
814 | void | |
815 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
816 | Symbol* gsym) | |
817 | { | |
818 | if (gsym->has_plt_offset()) | |
819 | return; | |
820 | ||
821 | if (this->plt_ == NULL) | |
822 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
823 | |
824 | this->plt_->add_entry(gsym); | |
825 | } | |
826 | ||
9fa33bee | 827 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
828 | |
829 | void | |
830 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
831 | { | |
832 | if (this->tls_base_symbol_defined_) | |
833 | return; | |
834 | ||
835 | Output_segment* tls_segment = layout->tls_segment(); | |
836 | if (tls_segment != NULL) | |
837 | { | |
183fd0e3 | 838 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 839 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 840 | Symbol_table::PREDEFINED, |
edfbb029 CC |
841 | tls_segment, 0, 0, |
842 | elfcpp::STT_TLS, | |
843 | elfcpp::STB_LOCAL, | |
844 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
845 | (is_exec |
846 | ? Symbol::SEGMENT_END | |
847 | : Symbol::SEGMENT_START), | |
848 | true); | |
edfbb029 CC |
849 | } |
850 | this->tls_base_symbol_defined_ = true; | |
851 | } | |
852 | ||
c2b45e22 CC |
853 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
854 | ||
855 | void | |
856 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
857 | Layout* layout) | |
858 | { | |
859 | if (this->plt_ == NULL) | |
860 | this->make_plt_section(symtab, layout); | |
861 | ||
862 | if (!this->plt_->has_tlsdesc_entry()) | |
863 | { | |
864 | // Allocate the TLSDESC_GOT entry. | |
865 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
866 | unsigned int got_offset = got->add_constant(0); | |
867 | ||
868 | // Allocate the TLSDESC_PLT entry. | |
869 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
870 | } | |
871 | } | |
872 | ||
31d60480 ILT |
873 | // Create a GOT entry for the TLS module index. |
874 | ||
875 | unsigned int | |
876 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
877 | Sized_relobj<64, false>* object) | |
878 | { | |
879 | if (this->got_mod_index_offset_ == -1U) | |
880 | { | |
881 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
882 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
883 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
884 | unsigned int got_offset = got->add_constant(0); | |
885 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
886 | got_offset, 0); | |
009a67a2 | 887 | got->add_constant(0); |
31d60480 ILT |
888 | this->got_mod_index_offset_ = got_offset; |
889 | } | |
890 | return this->got_mod_index_offset_; | |
891 | } | |
892 | ||
2e30d253 ILT |
893 | // Optimize the TLS relocation type based on what we know about the |
894 | // symbol. IS_FINAL is true if the final address of this symbol is | |
895 | // known at link time. | |
896 | ||
e041f13d | 897 | tls::Tls_optimization |
2e30d253 ILT |
898 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
899 | { | |
2e30d253 ILT |
900 | // If we are generating a shared library, then we can't do anything |
901 | // in the linker. | |
8851ecca | 902 | if (parameters->options().shared()) |
e041f13d | 903 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
904 | |
905 | switch (r_type) | |
906 | { | |
907 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
908 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
909 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
910 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
911 | // access. Since we know that we are generating an executable, |
912 | // we can convert this to Initial-Exec. If we also know that | |
913 | // this is a local symbol, we can further switch to Local-Exec. | |
914 | if (is_final) | |
e041f13d ILT |
915 | return tls::TLSOPT_TO_LE; |
916 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 917 | |
d61c17ea | 918 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
919 | // This is Local-Dynamic, which refers to a local symbol in the |
920 | // dynamic TLS block. Since we know that we generating an | |
921 | // executable, we can switch to Local-Exec. | |
e041f13d | 922 | return tls::TLSOPT_TO_LE; |
2e30d253 | 923 | |
0ffd9845 | 924 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
925 | case elfcpp::R_X86_64_DTPOFF64: |
926 | // Another Local-Dynamic reloc. | |
e041f13d | 927 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 928 | |
d61c17ea | 929 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
930 | // These are Initial-Exec relocs which get the thread offset |
931 | // from the GOT. If we know that we are linking against the | |
932 | // local symbol, we can switch to Local-Exec, which links the | |
933 | // thread offset into the instruction. | |
934 | if (is_final) | |
e041f13d ILT |
935 | return tls::TLSOPT_TO_LE; |
936 | return tls::TLSOPT_NONE; | |
2e30d253 | 937 | |
d61c17ea | 938 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
939 | // When we already have Local-Exec, there is nothing further we |
940 | // can do. | |
e041f13d | 941 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
942 | |
943 | default: | |
944 | gold_unreachable(); | |
945 | } | |
2e30d253 ILT |
946 | } |
947 | ||
e041f13d ILT |
948 | // Report an unsupported relocation against a local symbol. |
949 | ||
950 | void | |
951 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
952 | unsigned int r_type) | |
953 | { | |
75f2446e ILT |
954 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
955 | object->name().c_str(), r_type); | |
e041f13d ILT |
956 | } |
957 | ||
a036edd8 ILT |
958 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
959 | // dynamic linker does not support it, issue an error. The GNU linker | |
960 | // only issues a non-PIC error for an allocated read-only section. | |
961 | // Here we know the section is allocated, but we don't know that it is | |
962 | // read-only. But we check for all the relocation types which the | |
963 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
964 | // error even if the section is not read-only. | |
965 | ||
966 | void | |
967 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
968 | { | |
969 | switch (r_type) | |
970 | { | |
971 | // These are the relocation types supported by glibc for x86_64. | |
972 | case elfcpp::R_X86_64_RELATIVE: | |
973 | case elfcpp::R_X86_64_GLOB_DAT: | |
974 | case elfcpp::R_X86_64_JUMP_SLOT: | |
975 | case elfcpp::R_X86_64_DTPMOD64: | |
976 | case elfcpp::R_X86_64_DTPOFF64: | |
977 | case elfcpp::R_X86_64_TPOFF64: | |
978 | case elfcpp::R_X86_64_64: | |
979 | case elfcpp::R_X86_64_32: | |
980 | case elfcpp::R_X86_64_PC32: | |
981 | case elfcpp::R_X86_64_COPY: | |
982 | return; | |
983 | ||
984 | default: | |
985 | // This prevents us from issuing more than one error per reloc | |
986 | // section. But we can still wind up issuing more than one | |
987 | // error per object file. | |
988 | if (this->issued_non_pic_error_) | |
989 | return; | |
33aea2fd | 990 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
991 | object->error(_("requires unsupported dynamic reloc; " |
992 | "recompile with -fPIC")); | |
993 | this->issued_non_pic_error_ = true; | |
994 | return; | |
995 | ||
996 | case elfcpp::R_X86_64_NONE: | |
997 | gold_unreachable(); | |
998 | } | |
999 | } | |
1000 | ||
2e30d253 ILT |
1001 | // Scan a relocation for a local symbol. |
1002 | ||
1003 | inline void | |
ad0f2072 | 1004 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1005 | Layout* layout, |
1006 | Target_x86_64* target, | |
1007 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1008 | unsigned int data_shndx, |
4f4c5f80 | 1009 | Output_section* output_section, |
0ffd9845 | 1010 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1011 | unsigned int r_type, |
7bf1f802 | 1012 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1013 | { |
1014 | switch (r_type) | |
1015 | { | |
1016 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1017 | case elfcpp::R_386_GNU_VTINHERIT: |
1018 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1019 | break; |
1020 | ||
1021 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1022 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1023 | // executable), we need to create a dynamic relocation for this |
1024 | // location. The relocation applied at link time will apply the | |
1025 | // link-time value, so we flag the location with an | |
1026 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1027 | // relocate it easily. |
8851ecca | 1028 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1029 | { |
e8c846c3 | 1030 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1031 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1032 | rela_dyn->add_local_relative(object, r_sym, |
1033 | elfcpp::R_X86_64_RELATIVE, | |
1034 | output_section, data_shndx, | |
1035 | reloc.get_r_offset(), | |
1036 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1037 | } |
1038 | break; | |
1039 | ||
2e30d253 ILT |
1040 | case elfcpp::R_X86_64_32: |
1041 | case elfcpp::R_X86_64_32S: | |
1042 | case elfcpp::R_X86_64_16: | |
1043 | case elfcpp::R_X86_64_8: | |
96f2030e | 1044 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1045 | // executable), we need to create a dynamic relocation for this |
1046 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1047 | // because that is always a 64-bit relocation. | |
8851ecca | 1048 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1049 | { |
a036edd8 ILT |
1050 | this->check_non_pic(object, r_type); |
1051 | ||
96f2030e | 1052 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1053 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1054 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1055 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1056 | data_shndx, reloc.get_r_offset(), | |
1057 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1058 | else |
1059 | { | |
1060 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1061 | unsigned int shndx = lsym.get_st_shndx(); |
1062 | bool is_ordinary; | |
1063 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1064 | &is_ordinary); | |
1065 | if (!is_ordinary) | |
1066 | object->error(_("section symbol %u has bad shndx %u"), | |
1067 | r_sym, shndx); | |
1068 | else | |
1069 | rela_dyn->add_local_section(object, shndx, | |
1070 | r_type, output_section, | |
1071 | data_shndx, reloc.get_r_offset(), | |
1072 | reloc.get_r_addend()); | |
dceae3c1 | 1073 | } |
96f2030e | 1074 | } |
2e30d253 ILT |
1075 | break; |
1076 | ||
1077 | case elfcpp::R_X86_64_PC64: | |
1078 | case elfcpp::R_X86_64_PC32: | |
1079 | case elfcpp::R_X86_64_PC16: | |
1080 | case elfcpp::R_X86_64_PC8: | |
1081 | break; | |
1082 | ||
f389a824 ILT |
1083 | case elfcpp::R_X86_64_PLT32: |
1084 | // Since we know this is a local symbol, we can handle this as a | |
1085 | // PC32 reloc. | |
1086 | break; | |
1087 | ||
fdc2f80f | 1088 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1089 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1090 | case elfcpp::R_X86_64_GOTPC64: |
1091 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1092 | // We need a GOT section. |
1093 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1094 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1095 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1096 | break; |
1097 | ||
0ffd9845 ILT |
1098 | case elfcpp::R_X86_64_GOT64: |
1099 | case elfcpp::R_X86_64_GOT32: | |
1100 | case elfcpp::R_X86_64_GOTPCREL64: | |
1101 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1102 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1103 | { |
1104 | // The symbol requires a GOT entry. | |
1105 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1106 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1107 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1108 | { |
1109 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1110 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1111 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1112 | { |
1113 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1114 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1115 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1116 | rela_dyn->add_local_relative( |
1117 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1118 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1119 | else |
dceae3c1 | 1120 | { |
a036edd8 ILT |
1121 | this->check_non_pic(object, r_type); |
1122 | ||
dceae3c1 | 1123 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1124 | rela_dyn->add_local( |
1125 | object, r_sym, r_type, got, | |
1126 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1127 | } |
0ffd9845 ILT |
1128 | } |
1129 | } | |
ee9e9e86 ILT |
1130 | // For GOTPLT64, we'd normally want a PLT section, but since |
1131 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1132 | } |
1133 | break; | |
1134 | ||
2e30d253 ILT |
1135 | case elfcpp::R_X86_64_COPY: |
1136 | case elfcpp::R_X86_64_GLOB_DAT: | |
1137 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1138 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1139 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1140 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1141 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1142 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1143 | gold_error(_("%s: unexpected reloc %u in object file"), |
1144 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1145 | break; |
1146 | ||
d61c17ea | 1147 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1148 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1149 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1150 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1151 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1152 | case elfcpp::R_X86_64_DTPOFF32: |
1153 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1154 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1155 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1156 | { |
8851ecca | 1157 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1158 | const tls::Tls_optimization optimized_type |
1159 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1160 | switch (r_type) |
1161 | { | |
56622147 | 1162 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1163 | if (optimized_type == tls::TLSOPT_NONE) |
1164 | { | |
1165 | // Create a pair of GOT entries for the module index and | |
1166 | // dtv-relative offset. | |
1167 | Output_data_got<64, false>* got | |
1168 | = target->got_section(symtab, layout); | |
1169 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1170 | unsigned int shndx = lsym.get_st_shndx(); |
1171 | bool is_ordinary; | |
1172 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1173 | if (!is_ordinary) | |
1174 | object->error(_("local symbol %u has bad shndx %u"), | |
1175 | r_sym, shndx); | |
1176 | else | |
1177 | got->add_local_pair_with_rela(object, r_sym, | |
1178 | shndx, | |
1179 | GOT_TYPE_TLS_PAIR, | |
1180 | target->rela_dyn_section(layout), | |
1181 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1182 | } |
1183 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1184 | unsupported_reloc_local(object, r_type); | |
1185 | break; | |
1186 | ||
56622147 | 1187 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1188 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1189 | if (optimized_type == tls::TLSOPT_NONE) |
1190 | { | |
1191 | // Create reserved PLT and GOT entries for the resolver. | |
1192 | target->reserve_tlsdesc_entries(symtab, layout); | |
1193 | ||
1194 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1195 | Output_data_got<64, false>* got | |
1196 | = target->got_section(symtab, layout); | |
1197 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1198 | unsigned int shndx = lsym.get_st_shndx(); |
1199 | bool is_ordinary; | |
1200 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1201 | if (!is_ordinary) | |
1202 | object->error(_("local symbol %u has bad shndx %u"), | |
1203 | r_sym, shndx); | |
1204 | else | |
1205 | got->add_local_pair_with_rela(object, r_sym, | |
1206 | shndx, | |
1207 | GOT_TYPE_TLS_DESC, | |
1208 | target->rela_dyn_section(layout), | |
1209 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1210 | } |
1211 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1212 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1213 | break; |
1214 | ||
c2b45e22 CC |
1215 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1216 | break; | |
1217 | ||
e041f13d | 1218 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1219 | if (optimized_type == tls::TLSOPT_NONE) |
1220 | { | |
1221 | // Create a GOT entry for the module index. | |
31d60480 | 1222 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1223 | } |
1224 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1225 | unsupported_reloc_local(object, r_type); | |
1226 | break; | |
1227 | ||
0ffd9845 ILT |
1228 | case elfcpp::R_X86_64_DTPOFF32: |
1229 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1230 | break; |
1231 | ||
56622147 | 1232 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1233 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1234 | if (optimized_type == tls::TLSOPT_NONE) |
1235 | { | |
1236 | // Create a GOT entry for the tp-relative offset. | |
1237 | Output_data_got<64, false>* got | |
1238 | = target->got_section(symtab, layout); | |
1239 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1240 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1241 | target->rela_dyn_section(layout), |
1242 | elfcpp::R_X86_64_TPOFF64); | |
1243 | } | |
1244 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1245 | unsupported_reloc_local(object, r_type); |
1246 | break; | |
0ffd9845 | 1247 | |
56622147 | 1248 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1249 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1250 | if (output_is_shared) |
1251 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1252 | break; |
e041f13d ILT |
1253 | |
1254 | default: | |
1255 | gold_unreachable(); | |
2e30d253 ILT |
1256 | } |
1257 | } | |
1258 | break; | |
2e30d253 | 1259 | |
fdc2f80f ILT |
1260 | case elfcpp::R_X86_64_SIZE32: |
1261 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1262 | default: |
75f2446e ILT |
1263 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1264 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1265 | break; |
1266 | } | |
1267 | } | |
1268 | ||
1269 | ||
e041f13d ILT |
1270 | // Report an unsupported relocation against a global symbol. |
1271 | ||
1272 | void | |
1273 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1274 | unsigned int r_type, | |
1275 | Symbol* gsym) | |
1276 | { | |
75f2446e | 1277 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1278 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1279 | } |
1280 | ||
2e30d253 ILT |
1281 | // Scan a relocation for a global symbol. |
1282 | ||
1283 | inline void | |
ad0f2072 | 1284 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1285 | Layout* layout, |
1286 | Target_x86_64* target, | |
1287 | Sized_relobj<64, false>* object, | |
1288 | unsigned int data_shndx, | |
4f4c5f80 | 1289 | Output_section* output_section, |
d61c17ea ILT |
1290 | const elfcpp::Rela<64, false>& reloc, |
1291 | unsigned int r_type, | |
1292 | Symbol* gsym) | |
2e30d253 ILT |
1293 | { |
1294 | switch (r_type) | |
1295 | { | |
1296 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1297 | case elfcpp::R_386_GNU_VTINHERIT: |
1298 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1299 | break; |
1300 | ||
1301 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1302 | case elfcpp::R_X86_64_32: |
1303 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1304 | case elfcpp::R_X86_64_16: |
2e30d253 | 1305 | case elfcpp::R_X86_64_8: |
96f2030e | 1306 | { |
d61c6bd4 ILT |
1307 | // Make a PLT entry if necessary. |
1308 | if (gsym->needs_plt_entry()) | |
1309 | { | |
1310 | target->make_plt_entry(symtab, layout, gsym); | |
1311 | // Since this is not a PC-relative relocation, we may be | |
1312 | // taking the address of a function. In that case we need to | |
1313 | // set the entry in the dynamic symbol table to the address of | |
1314 | // the PLT entry. | |
8851ecca | 1315 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1316 | gsym->set_needs_dynsym_value(); |
1317 | } | |
1318 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1319 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1320 | { |
966d4097 | 1321 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1322 | { |
12c0daef | 1323 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1324 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1325 | } |
1326 | else if (r_type == elfcpp::R_X86_64_64 | |
1327 | && gsym->can_use_relative_reloc(false)) | |
1328 | { | |
1329 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1330 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1331 | output_section, object, | |
1332 | data_shndx, reloc.get_r_offset(), | |
1333 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1334 | } |
1335 | else | |
1336 | { | |
a036edd8 | 1337 | this->check_non_pic(object, r_type); |
96f2030e | 1338 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1339 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1340 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1341 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1342 | } |
1343 | } | |
1344 | } | |
1345 | break; | |
1346 | ||
1347 | case elfcpp::R_X86_64_PC64: | |
1348 | case elfcpp::R_X86_64_PC32: | |
1349 | case elfcpp::R_X86_64_PC16: | |
1350 | case elfcpp::R_X86_64_PC8: | |
1351 | { | |
1352 | // Make a PLT entry if necessary. | |
1353 | if (gsym->needs_plt_entry()) | |
1354 | target->make_plt_entry(symtab, layout, gsym); | |
1355 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1356 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1357 | if (gsym->is_func()) |
0700cf32 ILT |
1358 | flags |= Symbol::FUNCTION_CALL; |
1359 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1360 | { |
966d4097 | 1361 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1362 | { |
12c0daef | 1363 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1364 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1365 | } |
86849f1f | 1366 | else |
d61c6bd4 | 1367 | { |
a036edd8 | 1368 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1369 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1370 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1371 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1372 | reloc.get_r_addend()); |
1373 | } | |
86849f1f | 1374 | } |
d61c6bd4 | 1375 | } |
2e30d253 ILT |
1376 | break; |
1377 | ||
ff006520 | 1378 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1379 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1380 | case elfcpp::R_X86_64_GOTPCREL64: |
1381 | case elfcpp::R_X86_64_GOTPCREL: | |
1382 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1383 | { |
1384 | // The symbol requires a GOT entry. | |
1385 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1386 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1387 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1388 | else |
1389 | { | |
2e30d253 ILT |
1390 | // If this symbol is not fully resolved, we need to add a |
1391 | // dynamic relocation for it. | |
7bf1f802 | 1392 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1393 | if (gsym->is_from_dynobj() |
1394 | || gsym->is_undefined() | |
1395 | || gsym->is_preemptible()) | |
0a65a3a7 | 1396 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1397 | elfcpp::R_X86_64_GLOB_DAT); |
1398 | else | |
2e30d253 | 1399 | { |
0a65a3a7 CC |
1400 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1401 | rela_dyn->add_global_relative( | |
1402 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1403 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1404 | } |
1405 | } | |
ee9e9e86 ILT |
1406 | // For GOTPLT64, we also need a PLT entry (but only if the |
1407 | // symbol is not fully resolved). | |
1408 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1409 | && !gsym->final_value_is_known()) | |
1410 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1411 | } |
1412 | break; | |
1413 | ||
1414 | case elfcpp::R_X86_64_PLT32: | |
1415 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1416 | // Otherwise we need a PLT entry. | |
1417 | if (gsym->final_value_is_known()) | |
1418 | break; | |
96f2030e ILT |
1419 | // If building a shared library, we can also skip the PLT entry |
1420 | // if the symbol is defined in the output file and is protected | |
1421 | // or hidden. | |
1422 | if (gsym->is_defined() | |
1423 | && !gsym->is_from_dynobj() | |
1424 | && !gsym->is_preemptible()) | |
1425 | break; | |
2e30d253 ILT |
1426 | target->make_plt_entry(symtab, layout, gsym); |
1427 | break; | |
1428 | ||
fdc2f80f | 1429 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1430 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1431 | case elfcpp::R_X86_64_GOTPC64: |
1432 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1433 | // We need a GOT section. |
1434 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1435 | // For PLTOFF64, we also need a PLT entry (but only if the |
1436 | // symbol is not fully resolved). | |
1437 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1438 | && !gsym->final_value_is_known()) | |
1439 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1440 | break; |
1441 | ||
2e30d253 ILT |
1442 | case elfcpp::R_X86_64_COPY: |
1443 | case elfcpp::R_X86_64_GLOB_DAT: | |
1444 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1445 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1446 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1447 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1448 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1449 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1450 | gold_error(_("%s: unexpected reloc %u in object file"), |
1451 | object->name().c_str(), r_type); | |
2e30d253 | 1452 | break; |
2e30d253 | 1453 | |
d61c17ea | 1454 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1455 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1456 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1457 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1458 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1459 | case elfcpp::R_X86_64_DTPOFF32: |
1460 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1461 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1462 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1463 | { |
1464 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1465 | const tls::Tls_optimization optimized_type |
1466 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1467 | switch (r_type) |
1468 | { | |
56622147 | 1469 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1470 | if (optimized_type == tls::TLSOPT_NONE) |
1471 | { | |
1472 | // Create a pair of GOT entries for the module index and | |
1473 | // dtv-relative offset. | |
1474 | Output_data_got<64, false>* got | |
1475 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1476 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1477 | target->rela_dyn_section(layout), | |
1478 | elfcpp::R_X86_64_DTPMOD64, | |
1479 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1480 | } |
1481 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1482 | { | |
1483 | // Create a GOT entry for the tp-relative offset. | |
1484 | Output_data_got<64, false>* got | |
1485 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1486 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1487 | target->rela_dyn_section(layout), |
1488 | elfcpp::R_X86_64_TPOFF64); | |
1489 | } | |
1490 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1491 | unsupported_reloc_global(object, r_type, gsym); | |
1492 | break; | |
1493 | ||
56622147 | 1494 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1495 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1496 | if (optimized_type == tls::TLSOPT_NONE) |
1497 | { | |
1498 | // Create reserved PLT and GOT entries for the resolver. | |
1499 | target->reserve_tlsdesc_entries(symtab, layout); | |
1500 | ||
1501 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1502 | Output_data_got<64, false>* got | |
1503 | = target->got_section(symtab, layout); | |
1504 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1505 | target->rela_dyn_section(layout), | |
1506 | elfcpp::R_X86_64_TLSDESC, 0); | |
1507 | } | |
1508 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1509 | { | |
1510 | // Create a GOT entry for the tp-relative offset. | |
1511 | Output_data_got<64, false>* got | |
1512 | = target->got_section(symtab, layout); | |
1513 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1514 | target->rela_dyn_section(layout), | |
1515 | elfcpp::R_X86_64_TPOFF64); | |
1516 | } | |
1517 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1518 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1519 | break; |
1520 | ||
c2b45e22 CC |
1521 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1522 | break; | |
1523 | ||
e041f13d | 1524 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1525 | if (optimized_type == tls::TLSOPT_NONE) |
1526 | { | |
1527 | // Create a GOT entry for the module index. | |
31d60480 | 1528 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1529 | } |
1530 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1531 | unsupported_reloc_global(object, r_type, gsym); | |
1532 | break; | |
1533 | ||
0ffd9845 ILT |
1534 | case elfcpp::R_X86_64_DTPOFF32: |
1535 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1536 | break; |
1537 | ||
56622147 | 1538 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1539 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1540 | if (optimized_type == tls::TLSOPT_NONE) |
1541 | { | |
1542 | // Create a GOT entry for the tp-relative offset. | |
1543 | Output_data_got<64, false>* got | |
1544 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1545 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1546 | target->rela_dyn_section(layout), |
1547 | elfcpp::R_X86_64_TPOFF64); | |
1548 | } | |
1549 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1550 | unsupported_reloc_global(object, r_type, gsym); |
1551 | break; | |
0ffd9845 | 1552 | |
56622147 | 1553 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1554 | layout->set_has_static_tls(); |
8851ecca | 1555 | if (parameters->options().shared()) |
7bf1f802 | 1556 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1557 | break; |
e041f13d ILT |
1558 | |
1559 | default: | |
1560 | gold_unreachable(); | |
2e30d253 ILT |
1561 | } |
1562 | } | |
1563 | break; | |
fdc2f80f ILT |
1564 | |
1565 | case elfcpp::R_X86_64_SIZE32: | |
1566 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1567 | default: |
75f2446e | 1568 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1569 | object->name().c_str(), r_type, |
1570 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1571 | break; |
1572 | } | |
1573 | } | |
1574 | ||
6d03d481 | 1575 | void |
ad0f2072 | 1576 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
1577 | Layout* layout, |
1578 | Sized_relobj<64, false>* object, | |
1579 | unsigned int data_shndx, | |
1580 | unsigned int sh_type, | |
1581 | const unsigned char* prelocs, | |
1582 | size_t reloc_count, | |
1583 | Output_section* output_section, | |
1584 | bool needs_special_offset_handling, | |
1585 | size_t local_symbol_count, | |
1586 | const unsigned char* plocal_symbols) | |
1587 | { | |
1588 | ||
1589 | if (sh_type == elfcpp::SHT_REL) | |
1590 | { | |
1591 | return; | |
1592 | } | |
1593 | ||
1594 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1595 | Target_x86_64::Scan>( | |
6d03d481 ST |
1596 | symtab, |
1597 | layout, | |
1598 | this, | |
1599 | object, | |
1600 | data_shndx, | |
1601 | prelocs, | |
1602 | reloc_count, | |
1603 | output_section, | |
1604 | needs_special_offset_handling, | |
1605 | local_symbol_count, | |
1606 | plocal_symbols); | |
1607 | ||
1608 | } | |
2e30d253 ILT |
1609 | // Scan relocations for a section. |
1610 | ||
1611 | void | |
ad0f2072 | 1612 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
1613 | Layout* layout, |
1614 | Sized_relobj<64, false>* object, | |
1615 | unsigned int data_shndx, | |
1616 | unsigned int sh_type, | |
1617 | const unsigned char* prelocs, | |
1618 | size_t reloc_count, | |
730cdc88 ILT |
1619 | Output_section* output_section, |
1620 | bool needs_special_offset_handling, | |
d61c17ea | 1621 | size_t local_symbol_count, |
730cdc88 | 1622 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1623 | { |
1624 | if (sh_type == elfcpp::SHT_REL) | |
1625 | { | |
75f2446e ILT |
1626 | gold_error(_("%s: unsupported REL reloc section"), |
1627 | object->name().c_str()); | |
1628 | return; | |
2e30d253 ILT |
1629 | } |
1630 | ||
1631 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1632 | Target_x86_64::Scan>( | |
2e30d253 ILT |
1633 | symtab, |
1634 | layout, | |
1635 | this, | |
1636 | object, | |
1637 | data_shndx, | |
1638 | prelocs, | |
1639 | reloc_count, | |
730cdc88 ILT |
1640 | output_section, |
1641 | needs_special_offset_handling, | |
2e30d253 | 1642 | local_symbol_count, |
730cdc88 | 1643 | plocal_symbols); |
2e30d253 ILT |
1644 | } |
1645 | ||
1646 | // Finalize the sections. | |
1647 | ||
1648 | void | |
f59f41f3 DK |
1649 | Target_x86_64::do_finalize_sections( |
1650 | Layout* layout, | |
1651 | const Input_objects*, | |
1652 | Symbol_table*) | |
2e30d253 ILT |
1653 | { |
1654 | // Fill in some more dynamic tags. | |
1655 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1656 | if (odyn != NULL) | |
1657 | { | |
22b127cc ILT |
1658 | if (this->got_plt_ != NULL |
1659 | && this->got_plt_->output_section() != NULL) | |
2e30d253 ILT |
1660 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); |
1661 | ||
22b127cc ILT |
1662 | if (this->plt_ != NULL |
1663 | && this->plt_->output_section() != NULL) | |
2e30d253 ILT |
1664 | { |
1665 | const Output_data* od = this->plt_->rel_plt(); | |
1666 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1667 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1668 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1669 | if (this->plt_->has_tlsdesc_entry()) |
1670 | { | |
1671 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1672 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1673 | this->got_->finalize_data_size(); | |
1674 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1675 | this->plt_, plt_offset); | |
1676 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1677 | this->got_, got_offset); | |
1678 | } | |
2e30d253 ILT |
1679 | } |
1680 | ||
22b127cc ILT |
1681 | if (this->rela_dyn_ != NULL |
1682 | && this->rela_dyn_->output_section() != NULL) | |
2e30d253 | 1683 | { |
0ffd9845 | 1684 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1685 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1686 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1687 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1688 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1689 | } |
1690 | ||
8851ecca | 1691 | if (!parameters->options().shared()) |
2e30d253 ILT |
1692 | { |
1693 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1694 | // linker at run time, and used by the debugger. | |
1695 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1696 | } | |
1697 | } | |
1698 | ||
1699 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1700 | // relocs. | |
12c0daef ILT |
1701 | if (this->copy_relocs_.any_saved_relocs()) |
1702 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1703 | } |
1704 | ||
1705 | // Perform a relocation. | |
1706 | ||
1707 | inline bool | |
1708 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1709 | Target_x86_64* target, | |
031cdbed | 1710 | Output_section*, |
2e30d253 | 1711 | size_t relnum, |
0ffd9845 | 1712 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1713 | unsigned int r_type, |
1714 | const Sized_symbol<64>* gsym, | |
1715 | const Symbol_value<64>* psymval, | |
1716 | unsigned char* view, | |
1717 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1718 | section_size_type view_size) |
2e30d253 ILT |
1719 | { |
1720 | if (this->skip_call_tls_get_addr_) | |
1721 | { | |
5efc7cd2 CC |
1722 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1723 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1724 | || gsym == NULL |
0ffd9845 | 1725 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1726 | { |
75f2446e ILT |
1727 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1728 | _("missing expected TLS relocation")); | |
1729 | } | |
1730 | else | |
1731 | { | |
1732 | this->skip_call_tls_get_addr_ = false; | |
1733 | return false; | |
2e30d253 | 1734 | } |
2e30d253 ILT |
1735 | } |
1736 | ||
1737 | // Pick the value to use for symbols defined in shared objects. | |
1738 | Symbol_value<64> symval; | |
96f2030e | 1739 | if (gsym != NULL |
de4c45bd ILT |
1740 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1741 | || r_type == elfcpp::R_X86_64_PC32 | |
1742 | || r_type == elfcpp::R_X86_64_PC16 | |
1743 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1744 | { |
1745 | symval.set_output_value(target->plt_section()->address() | |
1746 | + gsym->plt_offset()); | |
1747 | psymval = &symval; | |
1748 | } | |
1749 | ||
1750 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1751 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1752 | ||
1753 | // Get the GOT offset if needed. | |
96f2030e ILT |
1754 | // The GOT pointer points to the end of the GOT section. |
1755 | // We need to subtract the size of the GOT section to get | |
1756 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1757 | bool have_got_offset = false; |
1758 | unsigned int got_offset = 0; | |
1759 | switch (r_type) | |
1760 | { | |
1761 | case elfcpp::R_X86_64_GOT32: | |
1762 | case elfcpp::R_X86_64_GOT64: | |
1763 | case elfcpp::R_X86_64_GOTPLT64: | |
1764 | case elfcpp::R_X86_64_GOTPCREL: | |
1765 | case elfcpp::R_X86_64_GOTPCREL64: | |
1766 | if (gsym != NULL) | |
1767 | { | |
0a65a3a7 CC |
1768 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1769 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1770 | } |
1771 | else | |
1772 | { | |
1773 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1774 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1775 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1776 | - target->got_size()); | |
0ffd9845 ILT |
1777 | } |
1778 | have_got_offset = true; | |
1779 | break; | |
1780 | ||
1781 | default: | |
1782 | break; | |
1783 | } | |
2e30d253 ILT |
1784 | |
1785 | switch (r_type) | |
1786 | { | |
1787 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1788 | case elfcpp::R_386_GNU_VTINHERIT: |
1789 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1790 | break; |
1791 | ||
1792 | case elfcpp::R_X86_64_64: | |
1793 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1794 | break; | |
1795 | ||
1796 | case elfcpp::R_X86_64_PC64: | |
1797 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1798 | address); | |
1799 | break; | |
1800 | ||
1801 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1802 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1803 | // uint64_t x = value + addend; | |
1804 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1805 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1806 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1807 | break; | |
1808 | ||
1809 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1810 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1811 | // int64_t x = value + addend; // note this quantity is signed! | |
1812 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1813 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1814 | break; | |
1815 | ||
1816 | case elfcpp::R_X86_64_PC32: | |
1817 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1818 | address); | |
1819 | break; | |
1820 | ||
1821 | case elfcpp::R_X86_64_16: | |
1822 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1823 | break; | |
1824 | ||
1825 | case elfcpp::R_X86_64_PC16: | |
1826 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1827 | address); | |
1828 | break; | |
1829 | ||
1830 | case elfcpp::R_X86_64_8: | |
1831 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1832 | break; | |
1833 | ||
1834 | case elfcpp::R_X86_64_PC8: | |
1835 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1836 | address); | |
1837 | break; | |
1838 | ||
1839 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1840 | gold_assert(gsym == NULL |
1841 | || gsym->has_plt_offset() | |
99f8faca ILT |
1842 | || gsym->final_value_is_known() |
1843 | || (gsym->is_defined() | |
1844 | && !gsym->is_from_dynobj() | |
1845 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1846 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1847 | // behaves differently because psymval was set to point to | |
1848 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1849 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1850 | address); | |
1851 | break; | |
1852 | ||
ee9e9e86 ILT |
1853 | case elfcpp::R_X86_64_PLTOFF64: |
1854 | { | |
1855 | gold_assert(gsym); | |
1856 | gold_assert(gsym->has_plt_offset() | |
1857 | || gsym->final_value_is_known()); | |
1858 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1859 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1860 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1861 | addend - got_address); | |
ee9e9e86 ILT |
1862 | } |
1863 | ||
2e30d253 | 1864 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1865 | gold_assert(have_got_offset); |
1866 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1867 | break; |
1868 | ||
e822f2b1 ILT |
1869 | case elfcpp::R_X86_64_GOTPC32: |
1870 | { | |
1871 | gold_assert(gsym); | |
1872 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1873 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1874 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1875 | } | |
1876 | break; | |
1877 | ||
1878 | case elfcpp::R_X86_64_GOT64: | |
1879 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1880 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1881 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1882 | gold_assert(have_got_offset); |
1883 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1884 | break; |
1885 | ||
1886 | case elfcpp::R_X86_64_GOTPC64: | |
1887 | { | |
1888 | gold_assert(gsym); | |
1889 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1890 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1891 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1892 | } | |
1893 | break; | |
1894 | ||
2e30d253 ILT |
1895 | case elfcpp::R_X86_64_GOTOFF64: |
1896 | { | |
1897 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1898 | value = (psymval->value(object, 0) | |
96f2030e | 1899 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1900 | Relocate_functions<64, false>::rela64(view, value, addend); |
1901 | } | |
1902 | break; | |
1903 | ||
1904 | case elfcpp::R_X86_64_GOTPCREL: | |
1905 | { | |
0ffd9845 ILT |
1906 | gold_assert(have_got_offset); |
1907 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1908 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1909 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1910 | } |
1911 | break; | |
1912 | ||
e822f2b1 ILT |
1913 | case elfcpp::R_X86_64_GOTPCREL64: |
1914 | { | |
0ffd9845 ILT |
1915 | gold_assert(have_got_offset); |
1916 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1917 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1918 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1919 | } |
1920 | break; | |
1921 | ||
2e30d253 ILT |
1922 | case elfcpp::R_X86_64_COPY: |
1923 | case elfcpp::R_X86_64_GLOB_DAT: | |
1924 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1925 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1926 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1927 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1928 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1929 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1930 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1931 | _("unexpected reloc %u in object file"), | |
1932 | r_type); | |
2e30d253 ILT |
1933 | break; |
1934 | ||
d61c17ea | 1935 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1936 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1937 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1938 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1939 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1940 | case elfcpp::R_X86_64_DTPOFF32: |
1941 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1942 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1943 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1944 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1945 | view, address, view_size); | |
2e30d253 | 1946 | break; |
2e30d253 | 1947 | |
fdc2f80f ILT |
1948 | case elfcpp::R_X86_64_SIZE32: |
1949 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1950 | default: |
75f2446e ILT |
1951 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1952 | _("unsupported reloc %u"), | |
1953 | r_type); | |
2e30d253 ILT |
1954 | break; |
1955 | } | |
1956 | ||
1957 | return true; | |
1958 | } | |
1959 | ||
1960 | // Perform a TLS relocation. | |
1961 | ||
1962 | inline void | |
d61c17ea | 1963 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1964 | Target_x86_64* target, |
d61c17ea | 1965 | size_t relnum, |
72ec2876 | 1966 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1967 | unsigned int r_type, |
1968 | const Sized_symbol<64>* gsym, | |
1969 | const Symbol_value<64>* psymval, | |
1970 | unsigned char* view, | |
6a41d30b | 1971 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1972 | section_size_type view_size) |
2e30d253 | 1973 | { |
2e30d253 | 1974 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1975 | |
1976 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1977 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1978 | |
1979 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1980 | ||
1981 | const bool is_final = (gsym == NULL | |
8851ecca | 1982 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1983 | : gsym->final_value_is_known()); |
e041f13d ILT |
1984 | const tls::Tls_optimization optimized_type |
1985 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1986 | switch (r_type) |
1987 | { | |
56622147 | 1988 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 1989 | this->saw_tls_block_reloc_ = true; |
e041f13d | 1990 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1991 | { |
7bf1f802 | 1992 | gold_assert(tls_segment != NULL); |
2e30d253 | 1993 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1994 | rela, r_type, value, view, |
2e30d253 ILT |
1995 | view_size); |
1996 | break; | |
1997 | } | |
7bf1f802 ILT |
1998 | else |
1999 | { | |
c2b45e22 CC |
2000 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2001 | ? GOT_TYPE_TLS_OFFSET | |
2002 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2003 | unsigned int got_offset; |
2004 | if (gsym != NULL) | |
2005 | { | |
c2b45e22 CC |
2006 | gold_assert(gsym->has_got_offset(got_type)); |
2007 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2008 | } |
2009 | else | |
2010 | { | |
2011 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2012 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2013 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2014 | - target->got_size()); |
2015 | } | |
2016 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2017 | { | |
2018 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2019 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2020 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2021 | value, view, address, view_size); |
7bf1f802 ILT |
2022 | break; |
2023 | } | |
2024 | else if (optimized_type == tls::TLSOPT_NONE) | |
2025 | { | |
2026 | // Relocate the field with the offset of the pair of GOT | |
2027 | // entries. | |
6a41d30b ILT |
2028 | value = target->got_plt_section()->address() + got_offset; |
2029 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2030 | address); | |
7bf1f802 ILT |
2031 | break; |
2032 | } | |
2033 | } | |
72ec2876 | 2034 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2035 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2036 | break; |
2037 | ||
c2b45e22 CC |
2038 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2039 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2040 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2041 | if (optimized_type == tls::TLSOPT_TO_LE) |
2042 | { | |
2043 | gold_assert(tls_segment != NULL); | |
2044 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2045 | rela, r_type, value, view, | |
2046 | view_size); | |
2047 | break; | |
2048 | } | |
2049 | else | |
2050 | { | |
2051 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2052 | ? GOT_TYPE_TLS_OFFSET | |
2053 | : GOT_TYPE_TLS_DESC); | |
2054 | unsigned int got_offset; | |
2055 | if (gsym != NULL) | |
2056 | { | |
2057 | gold_assert(gsym->has_got_offset(got_type)); | |
2058 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2059 | } | |
2060 | else | |
2061 | { | |
2062 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2063 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2064 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2065 | - target->got_size()); | |
2066 | } | |
2067 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2068 | { | |
2069 | gold_assert(tls_segment != NULL); | |
2070 | value = target->got_plt_section()->address() + got_offset; | |
2071 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2072 | rela, r_type, value, view, address, | |
2073 | view_size); | |
2074 | break; | |
2075 | } | |
2076 | else if (optimized_type == tls::TLSOPT_NONE) | |
2077 | { | |
2078 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2079 | { | |
2080 | // Relocate the field with the offset of the pair of GOT | |
2081 | // entries. | |
2082 | value = target->got_plt_section()->address() + got_offset; | |
2083 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2084 | address); | |
2085 | } | |
2086 | break; | |
2087 | } | |
2088 | } | |
2089 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2090 | _("unsupported reloc %u"), r_type); | |
2091 | break; | |
2092 | ||
56622147 | 2093 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2094 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2095 | if (optimized_type == tls::TLSOPT_TO_LE) |
2096 | { | |
7bf1f802 | 2097 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2098 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2099 | value, view, view_size); | |
2100 | break; | |
e041f13d | 2101 | } |
7bf1f802 ILT |
2102 | else if (optimized_type == tls::TLSOPT_NONE) |
2103 | { | |
2104 | // Relocate the field with the offset of the GOT entry for | |
2105 | // the module index. | |
2106 | unsigned int got_offset; | |
31d60480 ILT |
2107 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2108 | - target->got_size()); | |
6a41d30b ILT |
2109 | value = target->got_plt_section()->address() + got_offset; |
2110 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2111 | address); | |
7bf1f802 ILT |
2112 | break; |
2113 | } | |
72ec2876 | 2114 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2115 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2116 | break; |
0ffd9845 ILT |
2117 | |
2118 | case elfcpp::R_X86_64_DTPOFF32: | |
e041f13d | 2119 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2120 | { |
2121 | // This relocation type is used in debugging information. | |
2122 | // In that case we need to not optimize the value. If we | |
2123 | // haven't seen a TLSLD reloc, then we assume we should not | |
2124 | // optimize this reloc. | |
2125 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2126 | { |
2127 | gold_assert(tls_segment != NULL); | |
2128 | value -= tls_segment->memsz(); | |
2129 | } | |
497897f9 | 2130 | } |
d85c80a3 | 2131 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2132 | break; |
2133 | ||
2134 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d | 2135 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2136 | { |
2137 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2138 | if (this->saw_tls_block_reloc_) | |
27721062 ST |
2139 | { |
2140 | gold_assert(tls_segment != NULL); | |
2141 | value -= tls_segment->memsz(); | |
2142 | } | |
497897f9 | 2143 | } |
d85c80a3 | 2144 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2145 | break; |
2e30d253 | 2146 | |
56622147 ILT |
2147 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2148 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2149 | { | |
7bf1f802 | 2150 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2151 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2152 | rela, r_type, value, view, | |
2153 | view_size); | |
2154 | break; | |
2155 | } | |
7bf1f802 ILT |
2156 | else if (optimized_type == tls::TLSOPT_NONE) |
2157 | { | |
2158 | // Relocate the field with the offset of the GOT entry for | |
2159 | // the tp-relative offset of the symbol. | |
2160 | unsigned int got_offset; | |
2161 | if (gsym != NULL) | |
2162 | { | |
0a65a3a7 CC |
2163 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2164 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2165 | - target->got_size()); | |
7bf1f802 ILT |
2166 | } |
2167 | else | |
2168 | { | |
2169 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2170 | gold_assert(object->local_has_got_offset(r_sym, |
2171 | GOT_TYPE_TLS_OFFSET)); | |
2172 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2173 | - target->got_size()); |
2174 | } | |
6a41d30b ILT |
2175 | value = target->got_plt_section()->address() + got_offset; |
2176 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2177 | break; |
2178 | } | |
56622147 ILT |
2179 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2180 | _("unsupported reloc type %u"), | |
2181 | r_type); | |
2182 | break; | |
0ffd9845 | 2183 | |
56622147 | 2184 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2185 | value -= tls_segment->memsz(); |
d85c80a3 | 2186 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2187 | break; |
2e30d253 | 2188 | } |
2e30d253 ILT |
2189 | } |
2190 | ||
7bf1f802 ILT |
2191 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2192 | // Initial-Exec. | |
2193 | ||
2194 | inline void | |
2195 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2196 | size_t relnum, | |
c2b45e22 | 2197 | Output_segment*, |
7bf1f802 ILT |
2198 | const elfcpp::Rela<64, false>& rela, |
2199 | unsigned int, | |
2200 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2201 | unsigned char* view, | |
c2b45e22 | 2202 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2203 | section_size_type view_size) |
7bf1f802 ILT |
2204 | { |
2205 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2206 | // .word 0x6666; rex64; call __tls_get_addr | |
2207 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2208 | ||
2209 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2210 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2211 | ||
2212 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2213 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2214 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2215 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2216 | ||
2217 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2218 | ||
c2b45e22 CC |
2219 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2220 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2221 | |
2222 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2223 | // We can skip it. | |
2224 | this->skip_call_tls_get_addr_ = true; | |
2225 | } | |
2226 | ||
e041f13d | 2227 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2228 | // Local-Exec. |
2229 | ||
2230 | inline void | |
d61c17ea ILT |
2231 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2232 | size_t relnum, | |
2233 | Output_segment* tls_segment, | |
72ec2876 | 2234 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2235 | unsigned int, |
2236 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2237 | unsigned char* view, | |
fe8718a4 | 2238 | section_size_type view_size) |
2e30d253 | 2239 | { |
0ffd9845 ILT |
2240 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2241 | // .word 0x6666; rex64; call __tls_get_addr | |
2242 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2243 | |
72ec2876 ILT |
2244 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2245 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2246 | |
72ec2876 ILT |
2247 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2248 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2249 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2250 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2251 | |
0ffd9845 | 2252 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2253 | |
6a41d30b | 2254 | value -= tls_segment->memsz(); |
0ffd9845 | 2255 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2256 | |
2257 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2258 | // We can skip it. | |
2259 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2260 | } |
2261 | ||
c2b45e22 CC |
2262 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2263 | ||
2264 | inline void | |
2265 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2266 | const Relocate_info<64, false>* relinfo, | |
2267 | size_t relnum, | |
2268 | Output_segment*, | |
2269 | const elfcpp::Rela<64, false>& rela, | |
2270 | unsigned int r_type, | |
2271 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2272 | unsigned char* view, | |
2273 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2274 | section_size_type view_size) | |
2275 | { | |
2276 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2277 | { | |
2278 | // leaq foo@tlsdesc(%rip), %rax | |
2279 | // ==> movq foo@gottpoff(%rip), %rax | |
2280 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2281 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2282 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2283 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2284 | view[-2] = 0x8b; | |
2285 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2286 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2287 | } | |
2288 | else | |
2289 | { | |
2290 | // call *foo@tlscall(%rax) | |
2291 | // ==> nop; nop | |
2292 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2293 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2294 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2295 | view[0] == 0xff && view[1] == 0x10); | |
2296 | view[0] = 0x66; | |
2297 | view[1] = 0x90; | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2302 | ||
2303 | inline void | |
2304 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2305 | const Relocate_info<64, false>* relinfo, | |
2306 | size_t relnum, | |
2307 | Output_segment* tls_segment, | |
2308 | const elfcpp::Rela<64, false>& rela, | |
2309 | unsigned int r_type, | |
2310 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2311 | unsigned char* view, | |
2312 | section_size_type view_size) | |
2313 | { | |
2314 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2315 | { | |
2316 | // leaq foo@tlsdesc(%rip), %rax | |
2317 | // ==> movq foo@tpoff, %rax | |
2318 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2319 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2320 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2321 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2322 | view[-2] = 0xc7; | |
2323 | view[-1] = 0xc0; | |
2324 | value -= tls_segment->memsz(); | |
2325 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2326 | } | |
2327 | else | |
2328 | { | |
2329 | // call *foo@tlscall(%rax) | |
2330 | // ==> nop; nop | |
2331 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2332 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2333 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2334 | view[0] == 0xff && view[1] == 0x10); | |
2335 | view[0] = 0x66; | |
2336 | view[1] = 0x90; | |
2337 | } | |
2338 | } | |
2339 | ||
2e30d253 | 2340 | inline void |
72ec2876 ILT |
2341 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2342 | size_t relnum, | |
2343 | Output_segment*, | |
2344 | const elfcpp::Rela<64, false>& rela, | |
2345 | unsigned int, | |
2346 | elfcpp::Elf_types<64>::Elf_Addr, | |
2347 | unsigned char* view, | |
fe8718a4 | 2348 | section_size_type view_size) |
2e30d253 | 2349 | { |
72ec2876 ILT |
2350 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2351 | // ... leq foo@dtpoff(%rax),%reg | |
2352 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2353 | |
72ec2876 ILT |
2354 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2355 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2356 | |
72ec2876 ILT |
2357 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2358 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2359 | ||
2360 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2361 | ||
2362 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2363 | ||
2364 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2365 | // We can skip it. | |
2366 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2367 | } |
2368 | ||
56622147 ILT |
2369 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2370 | // Local-Exec. | |
2371 | ||
2372 | inline void | |
2373 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2374 | size_t relnum, | |
2375 | Output_segment* tls_segment, | |
2376 | const elfcpp::Rela<64, false>& rela, | |
2377 | unsigned int, | |
2378 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2379 | unsigned char* view, | |
fe8718a4 | 2380 | section_size_type view_size) |
56622147 ILT |
2381 | { |
2382 | // We need to examine the opcodes to figure out which instruction we | |
2383 | // are looking at. | |
2384 | ||
2385 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2386 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2387 | ||
2388 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2389 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2390 | ||
2391 | unsigned char op1 = view[-3]; | |
2392 | unsigned char op2 = view[-2]; | |
2393 | unsigned char op3 = view[-1]; | |
2394 | unsigned char reg = op3 >> 3; | |
2395 | ||
2396 | if (op2 == 0x8b) | |
2397 | { | |
2398 | // movq | |
2399 | if (op1 == 0x4c) | |
2400 | view[-3] = 0x49; | |
2401 | view[-2] = 0xc7; | |
2402 | view[-1] = 0xc0 | reg; | |
2403 | } | |
2404 | else if (reg == 4) | |
2405 | { | |
2406 | // Special handling for %rsp. | |
2407 | if (op1 == 0x4c) | |
2408 | view[-3] = 0x49; | |
2409 | view[-2] = 0x81; | |
2410 | view[-1] = 0xc0 | reg; | |
2411 | } | |
2412 | else | |
2413 | { | |
2414 | // addq | |
2415 | if (op1 == 0x4c) | |
2416 | view[-3] = 0x4d; | |
2417 | view[-2] = 0x8d; | |
2418 | view[-1] = 0x80 | reg | (reg << 3); | |
2419 | } | |
2420 | ||
6a41d30b | 2421 | value -= tls_segment->memsz(); |
56622147 ILT |
2422 | Relocate_functions<64, false>::rela32(view, value, 0); |
2423 | } | |
2424 | ||
2e30d253 ILT |
2425 | // Relocate section data. |
2426 | ||
2427 | void | |
364c7fa5 ILT |
2428 | Target_x86_64::relocate_section( |
2429 | const Relocate_info<64, false>* relinfo, | |
2430 | unsigned int sh_type, | |
2431 | const unsigned char* prelocs, | |
2432 | size_t reloc_count, | |
2433 | Output_section* output_section, | |
2434 | bool needs_special_offset_handling, | |
2435 | unsigned char* view, | |
2436 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2437 | section_size_type view_size, | |
2438 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2439 | { |
2440 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2441 | ||
2442 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2443 | Target_x86_64::Relocate>( | |
2444 | relinfo, | |
2445 | this, | |
2446 | prelocs, | |
2447 | reloc_count, | |
730cdc88 ILT |
2448 | output_section, |
2449 | needs_special_offset_handling, | |
2e30d253 ILT |
2450 | view, |
2451 | address, | |
364c7fa5 ILT |
2452 | view_size, |
2453 | reloc_symbol_changes); | |
2e30d253 ILT |
2454 | } |
2455 | ||
6a74a719 ILT |
2456 | // Return the size of a relocation while scanning during a relocatable |
2457 | // link. | |
2458 | ||
2459 | unsigned int | |
2460 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2461 | unsigned int r_type, | |
2462 | Relobj* object) | |
2463 | { | |
2464 | switch (r_type) | |
2465 | { | |
2466 | case elfcpp::R_X86_64_NONE: | |
2467 | case elfcpp::R_386_GNU_VTINHERIT: | |
2468 | case elfcpp::R_386_GNU_VTENTRY: | |
2469 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2470 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2471 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2472 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2473 | case elfcpp::R_X86_64_DTPOFF32: | |
2474 | case elfcpp::R_X86_64_DTPOFF64: | |
2475 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2476 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2477 | return 0; | |
2478 | ||
2479 | case elfcpp::R_X86_64_64: | |
2480 | case elfcpp::R_X86_64_PC64: | |
2481 | case elfcpp::R_X86_64_GOTOFF64: | |
2482 | case elfcpp::R_X86_64_GOTPC64: | |
2483 | case elfcpp::R_X86_64_PLTOFF64: | |
2484 | case elfcpp::R_X86_64_GOT64: | |
2485 | case elfcpp::R_X86_64_GOTPCREL64: | |
2486 | case elfcpp::R_X86_64_GOTPCREL: | |
2487 | case elfcpp::R_X86_64_GOTPLT64: | |
2488 | return 8; | |
2489 | ||
2490 | case elfcpp::R_X86_64_32: | |
2491 | case elfcpp::R_X86_64_32S: | |
2492 | case elfcpp::R_X86_64_PC32: | |
2493 | case elfcpp::R_X86_64_PLT32: | |
2494 | case elfcpp::R_X86_64_GOTPC32: | |
2495 | case elfcpp::R_X86_64_GOT32: | |
2496 | return 4; | |
2497 | ||
2498 | case elfcpp::R_X86_64_16: | |
2499 | case elfcpp::R_X86_64_PC16: | |
2500 | return 2; | |
2501 | ||
2502 | case elfcpp::R_X86_64_8: | |
2503 | case elfcpp::R_X86_64_PC8: | |
2504 | return 1; | |
2505 | ||
2506 | case elfcpp::R_X86_64_COPY: | |
2507 | case elfcpp::R_X86_64_GLOB_DAT: | |
2508 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2509 | case elfcpp::R_X86_64_RELATIVE: | |
2510 | // These are outstanding tls relocs, which are unexpected when linking | |
2511 | case elfcpp::R_X86_64_TPOFF64: | |
2512 | case elfcpp::R_X86_64_DTPMOD64: | |
2513 | case elfcpp::R_X86_64_TLSDESC: | |
2514 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2515 | return 0; | |
2516 | ||
2517 | case elfcpp::R_X86_64_SIZE32: | |
2518 | case elfcpp::R_X86_64_SIZE64: | |
2519 | default: | |
2520 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2521 | return 0; | |
2522 | } | |
2523 | } | |
2524 | ||
2525 | // Scan the relocs during a relocatable link. | |
2526 | ||
2527 | void | |
ad0f2072 | 2528 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
2529 | Layout* layout, |
2530 | Sized_relobj<64, false>* object, | |
2531 | unsigned int data_shndx, | |
2532 | unsigned int sh_type, | |
2533 | const unsigned char* prelocs, | |
2534 | size_t reloc_count, | |
2535 | Output_section* output_section, | |
2536 | bool needs_special_offset_handling, | |
2537 | size_t local_symbol_count, | |
2538 | const unsigned char* plocal_symbols, | |
2539 | Relocatable_relocs* rr) | |
2540 | { | |
2541 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2542 | ||
2543 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2544 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2545 | ||
7019cd25 | 2546 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 2547 | Scan_relocatable_relocs>( |
6a74a719 ILT |
2548 | symtab, |
2549 | layout, | |
2550 | object, | |
2551 | data_shndx, | |
2552 | prelocs, | |
2553 | reloc_count, | |
2554 | output_section, | |
2555 | needs_special_offset_handling, | |
2556 | local_symbol_count, | |
2557 | plocal_symbols, | |
2558 | rr); | |
2559 | } | |
2560 | ||
2561 | // Relocate a section during a relocatable link. | |
2562 | ||
2563 | void | |
2564 | Target_x86_64::relocate_for_relocatable( | |
2565 | const Relocate_info<64, false>* relinfo, | |
2566 | unsigned int sh_type, | |
2567 | const unsigned char* prelocs, | |
2568 | size_t reloc_count, | |
2569 | Output_section* output_section, | |
2570 | off_t offset_in_output_section, | |
2571 | const Relocatable_relocs* rr, | |
2572 | unsigned char* view, | |
2573 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2574 | section_size_type view_size, | |
2575 | unsigned char* reloc_view, | |
2576 | section_size_type reloc_view_size) | |
2577 | { | |
2578 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2579 | ||
7019cd25 | 2580 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2581 | relinfo, |
2582 | prelocs, | |
2583 | reloc_count, | |
2584 | output_section, | |
2585 | offset_in_output_section, | |
2586 | rr, | |
2587 | view, | |
2588 | view_address, | |
2589 | view_size, | |
2590 | reloc_view, | |
2591 | reloc_view_size); | |
2592 | } | |
2593 | ||
4fb6c25d ILT |
2594 | // Return the value to use for a dynamic which requires special |
2595 | // treatment. This is how we support equality comparisons of function | |
2596 | // pointers across shared library boundaries, as described in the | |
2597 | // processor specific ABI supplement. | |
2598 | ||
2599 | uint64_t | |
2600 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2601 | { | |
2602 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2603 | return this->plt_section()->address() + gsym->plt_offset(); | |
2604 | } | |
2605 | ||
2e30d253 ILT |
2606 | // Return a string used to fill a code section with nops to take up |
2607 | // the specified length. | |
2608 | ||
2609 | std::string | |
8851ecca | 2610 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2611 | { |
2612 | if (length >= 16) | |
2613 | { | |
2614 | // Build a jmpq instruction to skip over the bytes. | |
2615 | unsigned char jmp[5]; | |
2616 | jmp[0] = 0xe9; | |
04bf7072 | 2617 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2618 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2619 | + std::string(length - 5, '\0')); | |
2620 | } | |
2621 | ||
2622 | // Nop sequences of various lengths. | |
2623 | const char nop1[1] = { 0x90 }; // nop | |
2624 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2625 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2626 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2627 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2628 | 0x00 }; | |
2629 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2630 | 0x00, 0x00 }; |
1caf2c51 | 2631 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2632 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2633 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2634 | 0x00, 0x00, 0x00, 0x00 }; | |
2635 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2636 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2637 | 0x00 }; |
1caf2c51 ILT |
2638 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2639 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2640 | 0x00, 0x00 }; |
1caf2c51 ILT |
2641 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2642 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2643 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2644 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2645 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2646 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2647 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2648 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2649 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2650 | 0x00 }; |
1caf2c51 ILT |
2651 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2652 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2653 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2654 | 0x00, 0x00 }; |
1caf2c51 ILT |
2655 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2656 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2657 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2658 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2659 | |
2660 | const char* nops[16] = { | |
2661 | NULL, | |
2662 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2663 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2664 | }; | |
2665 | ||
2666 | return std::string(nops[length], length); | |
2667 | } | |
2668 | ||
364c7fa5 ILT |
2669 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
2670 | // compiled with -fstack-split. The function calls non-stack-split | |
2671 | // code. We have to change the function so that it always ensures | |
2672 | // that it has enough stack space to run some random function. | |
2673 | ||
2674 | void | |
2675 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
2676 | section_offset_type fnoffset, | |
2677 | section_size_type fnsize, | |
2678 | unsigned char* view, | |
2679 | section_size_type view_size, | |
2680 | std::string* from, | |
2681 | std::string* to) const | |
2682 | { | |
2683 | // The function starts with a comparison of the stack pointer and a | |
2684 | // field in the TCB. This is followed by a jump. | |
2685 | ||
2686 | // cmp %fs:NN,%rsp | |
2687 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
2688 | && fnsize > 9) | |
2689 | { | |
2690 | // We will call __morestack if the carry flag is set after this | |
2691 | // comparison. We turn the comparison into an stc instruction | |
2692 | // and some nops. | |
2693 | view[fnoffset] = '\xf9'; | |
2694 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
2695 | } | |
2696 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
2697 | // lea NN(%rsp),%r11 |
2698 | else if ((this->match_view(view, view_size, fnoffset, | |
2699 | "\x4c\x8d\x94\x24", 4) | |
2700 | || this->match_view(view, view_size, fnoffset, | |
2701 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
2702 | && fnsize > 8) |
2703 | { | |
2704 | // This is loading an offset from the stack pointer for a | |
2705 | // comparison. The offset is negative, so we decrease the | |
2706 | // offset by the amount of space we need for the stack. This | |
2707 | // means we will avoid calling __morestack if there happens to | |
2708 | // be plenty of space on the stack already. | |
2709 | unsigned char* pval = view + fnoffset + 4; | |
2710 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
2711 | val -= parameters->options().split_stack_adjust_size(); | |
2712 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
2713 | } | |
2714 | else | |
2715 | { | |
2716 | if (!object->has_no_split_stack()) | |
2717 | object->error(_("failed to match split-stack sequence at " | |
2718 | "section %u offset %0zx"), | |
ac33a407 | 2719 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
2720 | return; |
2721 | } | |
2722 | ||
2723 | // We have to change the function so that it calls | |
2724 | // __morestack_non_split instead of __morestack. The former will | |
2725 | // allocate additional stack space. | |
2726 | *from = "__morestack"; | |
2727 | *to = "__morestack_non_split"; | |
2728 | } | |
2729 | ||
2e30d253 ILT |
2730 | // The selector for x86_64 object files. |
2731 | ||
36959681 | 2732 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
2733 | { |
2734 | public: | |
2735 | Target_selector_x86_64() | |
36959681 ILT |
2736 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
2737 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
2738 | { } |
2739 | ||
2740 | Target* | |
e96caa79 ILT |
2741 | do_instantiate_target() |
2742 | { return new Target_x86_64(); } | |
36959681 | 2743 | |
2e30d253 ILT |
2744 | }; |
2745 | ||
2e30d253 ILT |
2746 | Target_selector_x86_64 target_selector_x86_64; |
2747 | ||
2748 | } // End anonymous namespace. |