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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" |
2e30d253 ILT |
41 | |
42 | namespace | |
43 | { | |
44 | ||
45 | using namespace gold; | |
46 | ||
47 | class Output_data_plt_x86_64; | |
48 | ||
49 | // The x86_64 target class. | |
d61c17ea ILT |
50 | // See the ABI at |
51 | // http://www.x86-64.org/documentation/abi.pdf | |
52 | // TLS info comes from | |
53 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 54 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 55 | |
36959681 | 56 | class Target_x86_64 : public Target_freebsd<64, false> |
2e30d253 ILT |
57 | { |
58 | public: | |
e822f2b1 ILT |
59 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
60 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
61 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
62 | ||
63 | Target_x86_64() | |
36959681 | 64 | : Target_freebsd<64, false>(&x86_64_info), |
0ffd9845 | 65 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
12c0daef | 66 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), |
edfbb029 | 67 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
2e30d253 ILT |
68 | { } |
69 | ||
8a5e3e08 ILT |
70 | // Hook for a new output section. |
71 | void | |
72 | do_new_output_section(Output_section*) const; | |
73 | ||
6d03d481 ST |
74 | // Scan the relocations to look for symbol adjustments. |
75 | void | |
76 | gc_process_relocs(const General_options& options, | |
77 | Symbol_table* symtab, | |
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 | |
91 | scan_relocs(const General_options& options, | |
92 | Symbol_table* symtab, | |
93 | Layout* layout, | |
94 | Sized_relobj<64, false>* object, | |
95 | unsigned int data_shndx, | |
96 | unsigned int sh_type, | |
97 | const unsigned char* prelocs, | |
98 | size_t reloc_count, | |
730cdc88 ILT |
99 | Output_section* output_section, |
100 | bool needs_special_offset_handling, | |
2e30d253 | 101 | size_t local_symbol_count, |
730cdc88 | 102 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
103 | |
104 | // Finalize the sections. | |
105 | void | |
106 | do_finalize_sections(Layout*); | |
107 | ||
4fb6c25d ILT |
108 | // Return the value to use for a dynamic which requires special |
109 | // treatment. | |
110 | uint64_t | |
111 | do_dynsym_value(const Symbol*) const; | |
112 | ||
2e30d253 ILT |
113 | // Relocate a section. |
114 | void | |
115 | relocate_section(const Relocate_info<64, false>*, | |
116 | unsigned int sh_type, | |
117 | const unsigned char* prelocs, | |
118 | size_t reloc_count, | |
730cdc88 ILT |
119 | Output_section* output_section, |
120 | bool needs_special_offset_handling, | |
2e30d253 ILT |
121 | unsigned char* view, |
122 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
fe8718a4 | 123 | section_size_type view_size); |
2e30d253 | 124 | |
6a74a719 ILT |
125 | // Scan the relocs during a relocatable link. |
126 | void | |
127 | scan_relocatable_relocs(const General_options& options, | |
128 | Symbol_table* symtab, | |
129 | Layout* layout, | |
130 | Sized_relobj<64, false>* object, | |
131 | unsigned int data_shndx, | |
132 | unsigned int sh_type, | |
133 | const unsigned char* prelocs, | |
134 | size_t reloc_count, | |
135 | Output_section* output_section, | |
136 | bool needs_special_offset_handling, | |
137 | size_t local_symbol_count, | |
138 | const unsigned char* plocal_symbols, | |
139 | Relocatable_relocs*); | |
140 | ||
141 | // Relocate a section during a relocatable link. | |
142 | void | |
143 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
144 | unsigned int sh_type, | |
145 | const unsigned char* prelocs, | |
146 | size_t reloc_count, | |
147 | Output_section* output_section, | |
148 | off_t offset_in_output_section, | |
149 | const Relocatable_relocs*, | |
150 | unsigned char* view, | |
151 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
152 | section_size_type view_size, | |
153 | unsigned char* reloc_view, | |
154 | section_size_type reloc_view_size); | |
155 | ||
2e30d253 ILT |
156 | // Return a string used to fill a code section with nops. |
157 | std::string | |
8851ecca | 158 | do_code_fill(section_size_type length) const; |
2e30d253 | 159 | |
9a2d6984 ILT |
160 | // Return whether SYM is defined by the ABI. |
161 | bool | |
9c2d0ef9 | 162 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
163 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
164 | ||
96f2030e | 165 | // Return the size of the GOT section. |
fe8718a4 | 166 | section_size_type |
96f2030e ILT |
167 | got_size() |
168 | { | |
169 | gold_assert(this->got_ != NULL); | |
170 | return this->got_->data_size(); | |
171 | } | |
172 | ||
2e30d253 ILT |
173 | private: |
174 | // The class which scans relocations. | |
a036edd8 | 175 | class Scan |
2e30d253 | 176 | { |
a036edd8 ILT |
177 | public: |
178 | Scan() | |
179 | : issued_non_pic_error_(false) | |
180 | { } | |
181 | ||
2e30d253 ILT |
182 | inline void |
183 | local(const General_options& options, Symbol_table* symtab, | |
184 | Layout* layout, Target_x86_64* target, | |
185 | Sized_relobj<64, false>* object, | |
186 | unsigned int data_shndx, | |
07f397ab | 187 | Output_section* output_section, |
2e30d253 ILT |
188 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
189 | const elfcpp::Sym<64, false>& lsym); | |
190 | ||
191 | inline void | |
192 | global(const General_options& options, Symbol_table* symtab, | |
193 | Layout* layout, Target_x86_64* target, | |
194 | Sized_relobj<64, false>* object, | |
195 | unsigned int data_shndx, | |
07f397ab | 196 | Output_section* output_section, |
2e30d253 ILT |
197 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
198 | Symbol* gsym); | |
e041f13d | 199 | |
a036edd8 | 200 | private: |
e041f13d ILT |
201 | static void |
202 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
203 | ||
204 | static void | |
205 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
206 | Symbol*); | |
a036edd8 ILT |
207 | |
208 | void | |
209 | check_non_pic(Relobj*, unsigned int r_type); | |
210 | ||
211 | // Whether we have issued an error about a non-PIC compilation. | |
212 | bool issued_non_pic_error_; | |
2e30d253 ILT |
213 | }; |
214 | ||
215 | // The class which implements relocation. | |
216 | class Relocate | |
217 | { | |
218 | public: | |
219 | Relocate() | |
497897f9 | 220 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
221 | { } |
222 | ||
223 | ~Relocate() | |
224 | { | |
225 | if (this->skip_call_tls_get_addr_) | |
226 | { | |
227 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 228 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
229 | } |
230 | } | |
231 | ||
232 | // Do a relocation. Return false if the caller should not issue | |
233 | // any warnings about this relocation. | |
234 | inline bool | |
031cdbed ILT |
235 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
236 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
237 | unsigned int r_type, const Sized_symbol<64>*, |
238 | const Symbol_value<64>*, | |
239 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 240 | section_size_type); |
2e30d253 ILT |
241 | |
242 | private: | |
243 | // Do a TLS relocation. | |
244 | inline void | |
7bf1f802 ILT |
245 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
246 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
247 | unsigned int r_type, const Sized_symbol<64>*, |
248 | const Symbol_value<64>*, | |
fe8718a4 ILT |
249 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
250 | section_size_type); | |
2e30d253 | 251 | |
c2b45e22 | 252 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
253 | inline void |
254 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
255 | Output_segment* tls_segment, | |
256 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
257 | elfcpp::Elf_types<64>::Elf_Addr value, | |
258 | unsigned char* view, | |
c2b45e22 | 259 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 260 | section_size_type view_size); |
7bf1f802 | 261 | |
56622147 ILT |
262 | // Do a TLS General-Dynamic to Local-Exec transition. |
263 | inline void | |
264 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
265 | Output_segment* tls_segment, |
266 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
267 | elfcpp::Elf_types<64>::Elf_Addr value, | |
268 | unsigned char* view, | |
fe8718a4 | 269 | section_size_type view_size); |
2e30d253 | 270 | |
c2b45e22 CC |
271 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
272 | inline void | |
273 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
274 | Output_segment* tls_segment, | |
275 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
276 | elfcpp::Elf_types<64>::Elf_Addr value, | |
277 | unsigned char* view, | |
278 | elfcpp::Elf_types<64>::Elf_Addr, | |
279 | section_size_type view_size); | |
280 | ||
281 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
282 | inline void | |
283 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
284 | Output_segment* tls_segment, | |
285 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
286 | elfcpp::Elf_types<64>::Elf_Addr value, | |
287 | unsigned char* view, | |
288 | section_size_type view_size); | |
289 | ||
56622147 | 290 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 291 | inline void |
56622147 | 292 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
293 | Output_segment* tls_segment, |
294 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
295 | elfcpp::Elf_types<64>::Elf_Addr value, | |
296 | unsigned char* view, | |
fe8718a4 | 297 | section_size_type view_size); |
2e30d253 | 298 | |
56622147 ILT |
299 | // Do a TLS Initial-Exec to Local-Exec transition. |
300 | static inline void | |
301 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
302 | Output_segment* tls_segment, |
303 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
304 | elfcpp::Elf_types<64>::Elf_Addr value, | |
305 | unsigned char* view, | |
fe8718a4 | 306 | section_size_type view_size); |
2e30d253 ILT |
307 | |
308 | // This is set if we should skip the next reloc, which should be a | |
309 | // PLT32 reloc against ___tls_get_addr. | |
310 | bool skip_call_tls_get_addr_; | |
497897f9 ILT |
311 | |
312 | // This is set if we see a relocation which could load the address | |
313 | // of the TLS block. Whether we see such a relocation determines | |
314 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
315 | // in debugging sections. | |
316 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
317 | }; |
318 | ||
6a74a719 ILT |
319 | // A class which returns the size required for a relocation type, |
320 | // used while scanning relocs during a relocatable link. | |
321 | class Relocatable_size_for_reloc | |
322 | { | |
323 | public: | |
324 | unsigned int | |
325 | get_size_for_reloc(unsigned int, Relobj*); | |
326 | }; | |
327 | ||
2e30d253 ILT |
328 | // Adjust TLS relocation type based on the options and whether this |
329 | // is a local symbol. | |
e041f13d | 330 | static tls::Tls_optimization |
2e30d253 ILT |
331 | optimize_tls_reloc(bool is_final, int r_type); |
332 | ||
333 | // Get the GOT section, creating it if necessary. | |
334 | Output_data_got<64, false>* | |
335 | got_section(Symbol_table*, Layout*); | |
336 | ||
96f2030e ILT |
337 | // Get the GOT PLT section. |
338 | Output_data_space* | |
339 | got_plt_section() const | |
340 | { | |
341 | gold_assert(this->got_plt_ != NULL); | |
342 | return this->got_plt_; | |
343 | } | |
344 | ||
c2b45e22 CC |
345 | // Create the PLT section. |
346 | void | |
347 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
348 | ||
2e30d253 ILT |
349 | // Create a PLT entry for a global symbol. |
350 | void | |
351 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
352 | ||
9fa33bee | 353 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
354 | void |
355 | define_tls_base_symbol(Symbol_table*, Layout*); | |
356 | ||
c2b45e22 CC |
357 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
358 | void | |
359 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
360 | ||
31d60480 ILT |
361 | // Create a GOT entry for the TLS module index. |
362 | unsigned int | |
363 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
364 | Sized_relobj<64, false>* object); | |
365 | ||
2e30d253 ILT |
366 | // Get the PLT section. |
367 | Output_data_plt_x86_64* | |
368 | plt_section() const | |
369 | { | |
370 | gold_assert(this->plt_ != NULL); | |
371 | return this->plt_; | |
372 | } | |
373 | ||
374 | // Get the dynamic reloc section, creating it if necessary. | |
375 | Reloc_section* | |
0ffd9845 | 376 | rela_dyn_section(Layout*); |
2e30d253 | 377 | |
d61c6bd4 ILT |
378 | // Return true if the symbol may need a COPY relocation. |
379 | // References from an executable object to non-function symbols | |
380 | // defined in a dynamic object may need a COPY relocation. | |
381 | bool | |
382 | may_need_copy_reloc(Symbol* gsym) | |
383 | { | |
8851ecca | 384 | return (!parameters->options().shared() |
d61c6bd4 ILT |
385 | && gsym->is_from_dynobj() |
386 | && gsym->type() != elfcpp::STT_FUNC); | |
387 | } | |
388 | ||
12c0daef | 389 | // Add a potential copy relocation. |
2e30d253 | 390 | void |
ef9beddf ILT |
391 | copy_reloc(Symbol_table* symtab, Layout* layout, |
392 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
393 | unsigned int shndx, Output_section* output_section, |
394 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
395 | { | |
396 | this->copy_relocs_.copy_reloc(symtab, layout, | |
397 | symtab->get_sized_symbol<64>(sym), | |
398 | object, shndx, output_section, | |
399 | reloc, this->rela_dyn_section(layout)); | |
400 | } | |
2e30d253 ILT |
401 | |
402 | // Information about this specific target which we pass to the | |
403 | // general Target structure. | |
404 | static const Target::Target_info x86_64_info; | |
405 | ||
0a65a3a7 CC |
406 | enum Got_type |
407 | { | |
408 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
409 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
410 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
411 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
412 | }; | |
413 | ||
2e30d253 ILT |
414 | // The GOT section. |
415 | Output_data_got<64, false>* got_; | |
416 | // The PLT section. | |
417 | Output_data_plt_x86_64* plt_; | |
418 | // The GOT PLT section. | |
419 | Output_data_space* got_plt_; | |
420 | // The dynamic reloc section. | |
0ffd9845 | 421 | Reloc_section* rela_dyn_; |
2e30d253 | 422 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 423 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
424 | // Space for variables copied with a COPY reloc. |
425 | Output_data_space* dynbss_; | |
c2b45e22 | 426 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 427 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
428 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
429 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
430 | }; |
431 | ||
432 | const Target::Target_info Target_x86_64::x86_64_info = | |
433 | { | |
434 | 64, // size | |
435 | false, // is_big_endian | |
436 | elfcpp::EM_X86_64, // machine_code | |
437 | false, // has_make_symbol | |
438 | false, // has_resolve | |
439 | true, // has_code_fill | |
35cdfc9a | 440 | true, // is_default_stack_executable |
0864d551 | 441 | '\0', // wrap_char |
2e30d253 | 442 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 443 | 0x400000, // default_text_segment_address |
cd72c291 | 444 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
445 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
446 | elfcpp::SHN_UNDEF, // small_common_shndx | |
447 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
448 | 0, // small_common_section_flags | |
449 | elfcpp::SHF_X86_64_LARGE // large_common_section_flags | |
2e30d253 ILT |
450 | }; |
451 | ||
8a5e3e08 ILT |
452 | // This is called when a new output section is created. This is where |
453 | // we handle the SHF_X86_64_LARGE. | |
454 | ||
455 | void | |
456 | Target_x86_64::do_new_output_section(Output_section *os) const | |
457 | { | |
458 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
459 | os->set_is_large_section(); | |
460 | } | |
461 | ||
2e30d253 ILT |
462 | // Get the GOT section, creating it if necessary. |
463 | ||
464 | Output_data_got<64, false>* | |
465 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
466 | { | |
467 | if (this->got_ == NULL) | |
468 | { | |
469 | gold_assert(symtab != NULL && layout != NULL); | |
470 | ||
471 | this->got_ = new Output_data_got<64, false>(); | |
472 | ||
9f1d377b ILT |
473 | Output_section* os; |
474 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
475 | (elfcpp::SHF_ALLOC | |
476 | | elfcpp::SHF_WRITE), | |
477 | this->got_); | |
478 | os->set_is_relro(); | |
2e30d253 ILT |
479 | |
480 | // The old GNU linker creates a .got.plt section. We just | |
481 | // create another set of data in the .got section. Note that we | |
482 | // always create a PLT if we create a GOT, although the PLT | |
483 | // might be empty. | |
7d9e3d98 | 484 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
9f1d377b ILT |
485 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
486 | (elfcpp::SHF_ALLOC | |
487 | | elfcpp::SHF_WRITE), | |
488 | this->got_plt_); | |
489 | os->set_is_relro(); | |
2e30d253 ILT |
490 | |
491 | // The first three entries are reserved. | |
27bc2bce | 492 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
493 | |
494 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 495 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
496 | this->got_plt_, |
497 | 0, 0, elfcpp::STT_OBJECT, | |
498 | elfcpp::STB_LOCAL, | |
499 | elfcpp::STV_HIDDEN, 0, | |
500 | false, false); | |
501 | } | |
502 | ||
503 | return this->got_; | |
504 | } | |
505 | ||
506 | // Get the dynamic reloc section, creating it if necessary. | |
507 | ||
508 | Target_x86_64::Reloc_section* | |
0ffd9845 | 509 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 510 | { |
0ffd9845 | 511 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
512 | { |
513 | gold_assert(layout != NULL); | |
d98bc257 | 514 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 515 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 516 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 517 | } |
0ffd9845 | 518 | return this->rela_dyn_; |
2e30d253 ILT |
519 | } |
520 | ||
521 | // A class to handle the PLT data. | |
522 | ||
523 | class Output_data_plt_x86_64 : public Output_section_data | |
524 | { | |
525 | public: | |
526 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
527 | ||
c2b45e22 CC |
528 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
529 | Output_data_space*); | |
2e30d253 ILT |
530 | |
531 | // Add an entry to the PLT. | |
532 | void | |
533 | add_entry(Symbol* gsym); | |
534 | ||
c2b45e22 CC |
535 | // Add the reserved TLSDESC_PLT entry to the PLT. |
536 | void | |
537 | reserve_tlsdesc_entry(unsigned int got_offset) | |
538 | { this->tlsdesc_got_offset_ = got_offset; } | |
539 | ||
540 | // Return true if a TLSDESC_PLT entry has been reserved. | |
541 | bool | |
542 | has_tlsdesc_entry() const | |
543 | { return this->tlsdesc_got_offset_ != -1U; } | |
544 | ||
545 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
546 | unsigned int | |
547 | get_tlsdesc_got_offset() const | |
548 | { return this->tlsdesc_got_offset_; } | |
549 | ||
550 | // Return the offset of the reserved TLSDESC_PLT entry. | |
551 | unsigned int | |
552 | get_tlsdesc_plt_offset() const | |
553 | { return (this->count_ + 1) * plt_entry_size; } | |
554 | ||
2e30d253 ILT |
555 | // Return the .rel.plt section data. |
556 | const Reloc_section* | |
557 | rel_plt() const | |
558 | { return this->rel_; } | |
559 | ||
560 | protected: | |
561 | void | |
562 | do_adjust_output_section(Output_section* os); | |
563 | ||
7d9e3d98 ILT |
564 | // Write to a map file. |
565 | void | |
566 | do_print_to_mapfile(Mapfile* mapfile) const | |
567 | { mapfile->print_output_data(this, _("** PLT")); } | |
568 | ||
2e30d253 ILT |
569 | private: |
570 | // The size of an entry in the PLT. | |
571 | static const int plt_entry_size = 16; | |
572 | ||
573 | // The first entry in the PLT. | |
574 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
575 | // procedure linkage table for both programs and shared objects." | |
576 | static unsigned char first_plt_entry[plt_entry_size]; | |
577 | ||
578 | // Other entries in the PLT for an executable. | |
579 | static unsigned char plt_entry[plt_entry_size]; | |
580 | ||
c2b45e22 CC |
581 | // The reserved TLSDESC entry in the PLT for an executable. |
582 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
583 | ||
2e30d253 ILT |
584 | // Set the final size. |
585 | void | |
c2b45e22 | 586 | set_final_data_size(); |
2e30d253 ILT |
587 | |
588 | // Write out the PLT data. | |
589 | void | |
590 | do_write(Output_file*); | |
591 | ||
592 | // The reloc section. | |
593 | Reloc_section* rel_; | |
c2b45e22 CC |
594 | // The .got section. |
595 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
596 | // The .got.plt section. |
597 | Output_data_space* got_plt_; | |
598 | // The number of PLT entries. | |
599 | unsigned int count_; | |
c2b45e22 CC |
600 | // Offset of the reserved TLSDESC_GOT entry when needed. |
601 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
602 | }; |
603 | ||
604 | // Create the PLT section. The ordinary .got section is an argument, | |
605 | // since we need to refer to the start. We also create our own .got | |
606 | // section just for PLT entries. | |
607 | ||
608 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 609 | Output_data_got<64, false>* got, |
2e30d253 | 610 | Output_data_space* got_plt) |
c2b45e22 CC |
611 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
612 | tlsdesc_got_offset_(-1U) | |
2e30d253 | 613 | { |
d98bc257 | 614 | this->rel_ = new Reloc_section(false); |
2e30d253 ILT |
615 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
616 | elfcpp::SHF_ALLOC, this->rel_); | |
617 | } | |
618 | ||
619 | void | |
620 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
621 | { | |
b0481b0b | 622 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
623 | } |
624 | ||
625 | // Add an entry to the PLT. | |
626 | ||
627 | void | |
628 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
629 | { | |
630 | gold_assert(!gsym->has_plt_offset()); | |
631 | ||
632 | // Note that when setting the PLT offset we skip the initial | |
633 | // reserved PLT entry. | |
634 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
635 | ||
636 | ++this->count_; | |
637 | ||
fe8718a4 | 638 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
639 | |
640 | // Every PLT entry needs a GOT entry which points back to the PLT | |
641 | // entry (this will be changed by the dynamic linker, normally | |
642 | // lazily when the function is called). | |
27bc2bce | 643 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
644 | |
645 | // Every PLT entry needs a reloc. | |
646 | gsym->set_needs_dynsym_entry(); | |
647 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
648 | got_offset, 0); | |
649 | ||
650 | // Note that we don't need to save the symbol. The contents of the | |
651 | // PLT are independent of which symbols are used. The symbols only | |
652 | // appear in the relocations. | |
653 | } | |
654 | ||
c2b45e22 CC |
655 | // Set the final size. |
656 | void | |
657 | Output_data_plt_x86_64::set_final_data_size() | |
658 | { | |
659 | unsigned int count = this->count_; | |
660 | if (this->has_tlsdesc_entry()) | |
661 | ++count; | |
662 | this->set_data_size((count + 1) * plt_entry_size); | |
663 | } | |
664 | ||
2e30d253 ILT |
665 | // The first entry in the PLT for an executable. |
666 | ||
667 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
668 | { | |
669 | // From AMD64 ABI Draft 0.98, page 76 | |
670 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 671 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
672 | 0xff, 0x25, // jmp indirect |
673 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
674 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
675 | }; | |
676 | ||
677 | // Subsequent entries in the PLT for an executable. | |
678 | ||
679 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
680 | { | |
681 | // From AMD64 ABI Draft 0.98, page 76 | |
682 | 0xff, 0x25, // jmpq indirect | |
683 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
684 | 0x68, // pushq immediate | |
685 | 0, 0, 0, 0, // replaced with offset into relocation table | |
686 | 0xe9, // jmpq relative | |
687 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
688 | }; | |
689 | ||
c2b45e22 CC |
690 | // The reserved TLSDESC entry in the PLT for an executable. |
691 | ||
692 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
693 | { | |
694 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
695 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
696 | 0xff, 0x35, // pushq x(%rip) | |
697 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
698 | 0xff, 0x25, // jmpq *y(%rip) | |
699 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
700 | 0x0f, 0x1f, // nop | |
701 | 0x40, 0 | |
702 | }; | |
703 | ||
2e30d253 ILT |
704 | // Write out the PLT. This uses the hand-coded instructions above, |
705 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
706 | ||
707 | void | |
708 | Output_data_plt_x86_64::do_write(Output_file* of) | |
709 | { | |
710 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
711 | const section_size_type oview_size = |
712 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
713 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
714 | ||
715 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
716 | const section_size_type got_size = |
717 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
718 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
719 | got_size); | |
720 | ||
721 | unsigned char* pov = oview; | |
722 | ||
c2b45e22 | 723 | // The base address of the .plt section. |
a984ee1d | 724 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 725 | // The base address of the .got section. |
a984ee1d | 726 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
727 | // The base address of the PLT portion of the .got section, |
728 | // which is where the GOT pointer will point, and where the | |
729 | // three reserved GOT entries are located. | |
a984ee1d | 730 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
731 | |
732 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 733 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
734 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
735 | (got_address + 8 | |
736 | - (plt_address + 6))); | |
737 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
738 | (got_address + 16 | |
739 | - (plt_address + 12))); | |
2e30d253 ILT |
740 | pov += plt_entry_size; |
741 | ||
742 | unsigned char* got_pov = got_view; | |
743 | ||
744 | memset(got_pov, 0, 24); | |
745 | got_pov += 24; | |
746 | ||
747 | unsigned int plt_offset = plt_entry_size; | |
748 | unsigned int got_offset = 24; | |
749 | const unsigned int count = this->count_; | |
750 | for (unsigned int plt_index = 0; | |
751 | plt_index < count; | |
752 | ++plt_index, | |
753 | pov += plt_entry_size, | |
754 | got_pov += 8, | |
755 | plt_offset += plt_entry_size, | |
756 | got_offset += 8) | |
757 | { | |
758 | // Set and adjust the PLT entry itself. | |
759 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
760 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
761 | (got_address + got_offset | |
762 | - (plt_address + plt_offset | |
763 | + 6))); | |
2e30d253 ILT |
764 | |
765 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
766 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
767 | - (plt_offset + plt_entry_size)); | |
768 | ||
769 | // Set the entry in the GOT. | |
770 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
771 | } | |
772 | ||
c2b45e22 CC |
773 | if (this->has_tlsdesc_entry()) |
774 | { | |
775 | // Set and adjust the reserved TLSDESC PLT entry. | |
776 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
777 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
778 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
779 | (got_address + 8 | |
780 | - (plt_address + plt_offset | |
781 | + 6))); | |
782 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
783 | (got_base | |
784 | + tlsdesc_got_offset | |
785 | - (plt_address + plt_offset | |
786 | + 12))); | |
787 | pov += plt_entry_size; | |
788 | } | |
789 | ||
fe8718a4 ILT |
790 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
791 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
792 | |
793 | of->write_output_view(offset, oview_size, oview); | |
794 | of->write_output_view(got_file_offset, got_size, got_view); | |
795 | } | |
796 | ||
c2b45e22 | 797 | // Create the PLT section. |
2e30d253 ILT |
798 | |
799 | void | |
c2b45e22 | 800 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 801 | { |
2e30d253 ILT |
802 | if (this->plt_ == NULL) |
803 | { | |
804 | // Create the GOT sections first. | |
805 | this->got_section(symtab, layout); | |
806 | ||
c2b45e22 CC |
807 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
808 | this->got_plt_); | |
2e30d253 ILT |
809 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
810 | (elfcpp::SHF_ALLOC | |
811 | | elfcpp::SHF_EXECINSTR), | |
812 | this->plt_); | |
813 | } | |
c2b45e22 CC |
814 | } |
815 | ||
816 | // Create a PLT entry for a global symbol. | |
817 | ||
818 | void | |
819 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
820 | Symbol* gsym) | |
821 | { | |
822 | if (gsym->has_plt_offset()) | |
823 | return; | |
824 | ||
825 | if (this->plt_ == NULL) | |
826 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
827 | |
828 | this->plt_->add_entry(gsym); | |
829 | } | |
830 | ||
9fa33bee | 831 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
832 | |
833 | void | |
834 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
835 | { | |
836 | if (this->tls_base_symbol_defined_) | |
837 | return; | |
838 | ||
839 | Output_segment* tls_segment = layout->tls_segment(); | |
840 | if (tls_segment != NULL) | |
841 | { | |
183fd0e3 | 842 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
843 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
844 | tls_segment, 0, 0, | |
845 | elfcpp::STT_TLS, | |
846 | elfcpp::STB_LOCAL, | |
847 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
848 | (is_exec |
849 | ? Symbol::SEGMENT_END | |
850 | : Symbol::SEGMENT_START), | |
851 | true); | |
edfbb029 CC |
852 | } |
853 | this->tls_base_symbol_defined_ = true; | |
854 | } | |
855 | ||
c2b45e22 CC |
856 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
857 | ||
858 | void | |
859 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
860 | Layout* layout) | |
861 | { | |
862 | if (this->plt_ == NULL) | |
863 | this->make_plt_section(symtab, layout); | |
864 | ||
865 | if (!this->plt_->has_tlsdesc_entry()) | |
866 | { | |
867 | // Allocate the TLSDESC_GOT entry. | |
868 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
869 | unsigned int got_offset = got->add_constant(0); | |
870 | ||
871 | // Allocate the TLSDESC_PLT entry. | |
872 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
873 | } | |
874 | } | |
875 | ||
31d60480 ILT |
876 | // Create a GOT entry for the TLS module index. |
877 | ||
878 | unsigned int | |
879 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
880 | Sized_relobj<64, false>* object) | |
881 | { | |
882 | if (this->got_mod_index_offset_ == -1U) | |
883 | { | |
884 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
885 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
886 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
887 | unsigned int got_offset = got->add_constant(0); | |
888 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
889 | got_offset, 0); | |
009a67a2 | 890 | got->add_constant(0); |
31d60480 ILT |
891 | this->got_mod_index_offset_ = got_offset; |
892 | } | |
893 | return this->got_mod_index_offset_; | |
894 | } | |
895 | ||
2e30d253 ILT |
896 | // Optimize the TLS relocation type based on what we know about the |
897 | // symbol. IS_FINAL is true if the final address of this symbol is | |
898 | // known at link time. | |
899 | ||
e041f13d | 900 | tls::Tls_optimization |
2e30d253 ILT |
901 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
902 | { | |
2e30d253 ILT |
903 | // If we are generating a shared library, then we can't do anything |
904 | // in the linker. | |
8851ecca | 905 | if (parameters->options().shared()) |
e041f13d | 906 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
907 | |
908 | switch (r_type) | |
909 | { | |
910 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
911 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
912 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
913 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
914 | // access. Since we know that we are generating an executable, |
915 | // we can convert this to Initial-Exec. If we also know that | |
916 | // this is a local symbol, we can further switch to Local-Exec. | |
917 | if (is_final) | |
e041f13d ILT |
918 | return tls::TLSOPT_TO_LE; |
919 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 920 | |
d61c17ea | 921 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
922 | // This is Local-Dynamic, which refers to a local symbol in the |
923 | // dynamic TLS block. Since we know that we generating an | |
924 | // executable, we can switch to Local-Exec. | |
e041f13d | 925 | return tls::TLSOPT_TO_LE; |
2e30d253 | 926 | |
0ffd9845 | 927 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
928 | case elfcpp::R_X86_64_DTPOFF64: |
929 | // Another Local-Dynamic reloc. | |
e041f13d | 930 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 931 | |
d61c17ea | 932 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
933 | // These are Initial-Exec relocs which get the thread offset |
934 | // from the GOT. If we know that we are linking against the | |
935 | // local symbol, we can switch to Local-Exec, which links the | |
936 | // thread offset into the instruction. | |
937 | if (is_final) | |
e041f13d ILT |
938 | return tls::TLSOPT_TO_LE; |
939 | return tls::TLSOPT_NONE; | |
2e30d253 | 940 | |
d61c17ea | 941 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
942 | // When we already have Local-Exec, there is nothing further we |
943 | // can do. | |
e041f13d | 944 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
945 | |
946 | default: | |
947 | gold_unreachable(); | |
948 | } | |
2e30d253 ILT |
949 | } |
950 | ||
e041f13d ILT |
951 | // Report an unsupported relocation against a local symbol. |
952 | ||
953 | void | |
954 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
955 | unsigned int r_type) | |
956 | { | |
75f2446e ILT |
957 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
958 | object->name().c_str(), r_type); | |
e041f13d ILT |
959 | } |
960 | ||
a036edd8 ILT |
961 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
962 | // dynamic linker does not support it, issue an error. The GNU linker | |
963 | // only issues a non-PIC error for an allocated read-only section. | |
964 | // Here we know the section is allocated, but we don't know that it is | |
965 | // read-only. But we check for all the relocation types which the | |
966 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
967 | // error even if the section is not read-only. | |
968 | ||
969 | void | |
970 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
971 | { | |
972 | switch (r_type) | |
973 | { | |
974 | // These are the relocation types supported by glibc for x86_64. | |
975 | case elfcpp::R_X86_64_RELATIVE: | |
976 | case elfcpp::R_X86_64_GLOB_DAT: | |
977 | case elfcpp::R_X86_64_JUMP_SLOT: | |
978 | case elfcpp::R_X86_64_DTPMOD64: | |
979 | case elfcpp::R_X86_64_DTPOFF64: | |
980 | case elfcpp::R_X86_64_TPOFF64: | |
981 | case elfcpp::R_X86_64_64: | |
982 | case elfcpp::R_X86_64_32: | |
983 | case elfcpp::R_X86_64_PC32: | |
984 | case elfcpp::R_X86_64_COPY: | |
985 | return; | |
986 | ||
987 | default: | |
988 | // This prevents us from issuing more than one error per reloc | |
989 | // section. But we can still wind up issuing more than one | |
990 | // error per object file. | |
991 | if (this->issued_non_pic_error_) | |
992 | return; | |
33aea2fd | 993 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
994 | object->error(_("requires unsupported dynamic reloc; " |
995 | "recompile with -fPIC")); | |
996 | this->issued_non_pic_error_ = true; | |
997 | return; | |
998 | ||
999 | case elfcpp::R_X86_64_NONE: | |
1000 | gold_unreachable(); | |
1001 | } | |
1002 | } | |
1003 | ||
2e30d253 ILT |
1004 | // Scan a relocation for a local symbol. |
1005 | ||
1006 | inline void | |
1007 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
1008 | Symbol_table* symtab, |
1009 | Layout* layout, | |
1010 | Target_x86_64* target, | |
1011 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1012 | unsigned int data_shndx, |
4f4c5f80 | 1013 | Output_section* output_section, |
0ffd9845 | 1014 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1015 | unsigned int r_type, |
7bf1f802 | 1016 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
1017 | { |
1018 | switch (r_type) | |
1019 | { | |
1020 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1021 | case elfcpp::R_386_GNU_VTINHERIT: |
1022 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1023 | break; |
1024 | ||
1025 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1026 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1027 | // executable), we need to create a dynamic relocation for this |
1028 | // location. The relocation applied at link time will apply the | |
1029 | // link-time value, so we flag the location with an | |
1030 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1031 | // relocate it easily. |
8851ecca | 1032 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1033 | { |
e8c846c3 | 1034 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1035 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1036 | rela_dyn->add_local_relative(object, r_sym, |
1037 | elfcpp::R_X86_64_RELATIVE, | |
1038 | output_section, data_shndx, | |
1039 | reloc.get_r_offset(), | |
1040 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1041 | } |
1042 | break; | |
1043 | ||
2e30d253 ILT |
1044 | case elfcpp::R_X86_64_32: |
1045 | case elfcpp::R_X86_64_32S: | |
1046 | case elfcpp::R_X86_64_16: | |
1047 | case elfcpp::R_X86_64_8: | |
96f2030e | 1048 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1049 | // executable), we need to create a dynamic relocation for this |
1050 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1051 | // because that is always a 64-bit relocation. | |
8851ecca | 1052 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1053 | { |
a036edd8 ILT |
1054 | this->check_non_pic(object, r_type); |
1055 | ||
96f2030e | 1056 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1057 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1058 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1059 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1060 | data_shndx, reloc.get_r_offset(), | |
1061 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1062 | else |
1063 | { | |
1064 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1065 | unsigned int shndx = lsym.get_st_shndx(); |
1066 | bool is_ordinary; | |
1067 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1068 | &is_ordinary); | |
1069 | if (!is_ordinary) | |
1070 | object->error(_("section symbol %u has bad shndx %u"), | |
1071 | r_sym, shndx); | |
1072 | else | |
1073 | rela_dyn->add_local_section(object, shndx, | |
1074 | r_type, output_section, | |
1075 | data_shndx, reloc.get_r_offset(), | |
1076 | reloc.get_r_addend()); | |
dceae3c1 | 1077 | } |
96f2030e | 1078 | } |
2e30d253 ILT |
1079 | break; |
1080 | ||
1081 | case elfcpp::R_X86_64_PC64: | |
1082 | case elfcpp::R_X86_64_PC32: | |
1083 | case elfcpp::R_X86_64_PC16: | |
1084 | case elfcpp::R_X86_64_PC8: | |
1085 | break; | |
1086 | ||
f389a824 ILT |
1087 | case elfcpp::R_X86_64_PLT32: |
1088 | // Since we know this is a local symbol, we can handle this as a | |
1089 | // PC32 reloc. | |
1090 | break; | |
1091 | ||
fdc2f80f | 1092 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1093 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1094 | case elfcpp::R_X86_64_GOTPC64: |
1095 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1096 | // We need a GOT section. |
1097 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1098 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1099 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1100 | break; |
1101 | ||
0ffd9845 ILT |
1102 | case elfcpp::R_X86_64_GOT64: |
1103 | case elfcpp::R_X86_64_GOT32: | |
1104 | case elfcpp::R_X86_64_GOTPCREL64: | |
1105 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1106 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1107 | { |
1108 | // The symbol requires a GOT entry. | |
1109 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1110 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1111 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1112 | { |
1113 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1114 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1115 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1116 | { |
1117 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1118 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1119 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1120 | rela_dyn->add_local_relative( |
1121 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1122 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1123 | else |
dceae3c1 | 1124 | { |
a036edd8 ILT |
1125 | this->check_non_pic(object, r_type); |
1126 | ||
dceae3c1 | 1127 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1128 | rela_dyn->add_local( |
1129 | object, r_sym, r_type, got, | |
1130 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1131 | } |
0ffd9845 ILT |
1132 | } |
1133 | } | |
ee9e9e86 ILT |
1134 | // For GOTPLT64, we'd normally want a PLT section, but since |
1135 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1136 | } |
1137 | break; | |
1138 | ||
2e30d253 ILT |
1139 | case elfcpp::R_X86_64_COPY: |
1140 | case elfcpp::R_X86_64_GLOB_DAT: | |
1141 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1142 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1143 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1144 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1145 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1146 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1147 | gold_error(_("%s: unexpected reloc %u in object file"), |
1148 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1149 | break; |
1150 | ||
d61c17ea | 1151 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1152 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1153 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1154 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1155 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1156 | case elfcpp::R_X86_64_DTPOFF32: |
1157 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1158 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1159 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1160 | { |
8851ecca | 1161 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1162 | const tls::Tls_optimization optimized_type |
1163 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1164 | switch (r_type) |
1165 | { | |
56622147 | 1166 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1167 | if (optimized_type == tls::TLSOPT_NONE) |
1168 | { | |
1169 | // Create a pair of GOT entries for the module index and | |
1170 | // dtv-relative offset. | |
1171 | Output_data_got<64, false>* got | |
1172 | = target->got_section(symtab, layout); | |
1173 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1174 | unsigned int shndx = lsym.get_st_shndx(); |
1175 | bool is_ordinary; | |
1176 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1177 | if (!is_ordinary) | |
1178 | object->error(_("local symbol %u has bad shndx %u"), | |
1179 | r_sym, shndx); | |
1180 | else | |
1181 | got->add_local_pair_with_rela(object, r_sym, | |
1182 | shndx, | |
1183 | GOT_TYPE_TLS_PAIR, | |
1184 | target->rela_dyn_section(layout), | |
1185 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1186 | } |
1187 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1188 | unsupported_reloc_local(object, r_type); | |
1189 | break; | |
1190 | ||
56622147 | 1191 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1192 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1193 | if (optimized_type == tls::TLSOPT_NONE) |
1194 | { | |
1195 | // Create reserved PLT and GOT entries for the resolver. | |
1196 | target->reserve_tlsdesc_entries(symtab, layout); | |
1197 | ||
1198 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1199 | Output_data_got<64, false>* got | |
1200 | = target->got_section(symtab, layout); | |
1201 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1202 | unsigned int shndx = lsym.get_st_shndx(); |
1203 | bool is_ordinary; | |
1204 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1205 | if (!is_ordinary) | |
1206 | object->error(_("local symbol %u has bad shndx %u"), | |
1207 | r_sym, shndx); | |
1208 | else | |
1209 | got->add_local_pair_with_rela(object, r_sym, | |
1210 | shndx, | |
1211 | GOT_TYPE_TLS_DESC, | |
1212 | target->rela_dyn_section(layout), | |
1213 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1214 | } |
1215 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1216 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1217 | break; |
1218 | ||
c2b45e22 CC |
1219 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1220 | break; | |
1221 | ||
e041f13d | 1222 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1223 | if (optimized_type == tls::TLSOPT_NONE) |
1224 | { | |
1225 | // Create a GOT entry for the module index. | |
31d60480 | 1226 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1227 | } |
1228 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1229 | unsupported_reloc_local(object, r_type); | |
1230 | break; | |
1231 | ||
0ffd9845 ILT |
1232 | case elfcpp::R_X86_64_DTPOFF32: |
1233 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1234 | break; |
1235 | ||
56622147 | 1236 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1237 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1238 | if (optimized_type == tls::TLSOPT_NONE) |
1239 | { | |
1240 | // Create a GOT entry for the tp-relative offset. | |
1241 | Output_data_got<64, false>* got | |
1242 | = target->got_section(symtab, layout); | |
1243 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1244 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1245 | target->rela_dyn_section(layout), |
1246 | elfcpp::R_X86_64_TPOFF64); | |
1247 | } | |
1248 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1249 | unsupported_reloc_local(object, r_type); |
1250 | break; | |
0ffd9845 | 1251 | |
56622147 | 1252 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1253 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1254 | if (output_is_shared) |
1255 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1256 | break; |
e041f13d ILT |
1257 | |
1258 | default: | |
1259 | gold_unreachable(); | |
2e30d253 ILT |
1260 | } |
1261 | } | |
1262 | break; | |
2e30d253 | 1263 | |
fdc2f80f ILT |
1264 | case elfcpp::R_X86_64_SIZE32: |
1265 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1266 | default: |
75f2446e ILT |
1267 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1268 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1269 | break; |
1270 | } | |
1271 | } | |
1272 | ||
1273 | ||
e041f13d ILT |
1274 | // Report an unsupported relocation against a global symbol. |
1275 | ||
1276 | void | |
1277 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1278 | unsigned int r_type, | |
1279 | Symbol* gsym) | |
1280 | { | |
75f2446e | 1281 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1282 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1283 | } |
1284 | ||
2e30d253 ILT |
1285 | // Scan a relocation for a global symbol. |
1286 | ||
1287 | inline void | |
12c0daef | 1288 | Target_x86_64::Scan::global(const General_options&, |
d61c17ea ILT |
1289 | Symbol_table* symtab, |
1290 | Layout* layout, | |
1291 | Target_x86_64* target, | |
1292 | Sized_relobj<64, false>* object, | |
1293 | unsigned int data_shndx, | |
4f4c5f80 | 1294 | Output_section* output_section, |
d61c17ea ILT |
1295 | const elfcpp::Rela<64, false>& reloc, |
1296 | unsigned int r_type, | |
1297 | Symbol* gsym) | |
2e30d253 ILT |
1298 | { |
1299 | switch (r_type) | |
1300 | { | |
1301 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1302 | case elfcpp::R_386_GNU_VTINHERIT: |
1303 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1304 | break; |
1305 | ||
1306 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1307 | case elfcpp::R_X86_64_32: |
1308 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1309 | case elfcpp::R_X86_64_16: |
2e30d253 | 1310 | case elfcpp::R_X86_64_8: |
96f2030e | 1311 | { |
d61c6bd4 ILT |
1312 | // Make a PLT entry if necessary. |
1313 | if (gsym->needs_plt_entry()) | |
1314 | { | |
1315 | target->make_plt_entry(symtab, layout, gsym); | |
1316 | // Since this is not a PC-relative relocation, we may be | |
1317 | // taking the address of a function. In that case we need to | |
1318 | // set the entry in the dynamic symbol table to the address of | |
1319 | // the PLT entry. | |
8851ecca | 1320 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1321 | gsym->set_needs_dynsym_value(); |
1322 | } | |
1323 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1324 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1325 | { |
1326 | if (target->may_need_copy_reloc(gsym)) | |
1327 | { | |
12c0daef | 1328 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1329 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1330 | } |
1331 | else if (r_type == elfcpp::R_X86_64_64 | |
1332 | && gsym->can_use_relative_reloc(false)) | |
1333 | { | |
1334 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1335 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1336 | output_section, object, | |
1337 | data_shndx, reloc.get_r_offset(), | |
1338 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1339 | } |
1340 | else | |
1341 | { | |
a036edd8 | 1342 | this->check_non_pic(object, r_type); |
96f2030e | 1343 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1344 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1345 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1346 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1347 | } |
1348 | } | |
1349 | } | |
1350 | break; | |
1351 | ||
1352 | case elfcpp::R_X86_64_PC64: | |
1353 | case elfcpp::R_X86_64_PC32: | |
1354 | case elfcpp::R_X86_64_PC16: | |
1355 | case elfcpp::R_X86_64_PC8: | |
1356 | { | |
1357 | // Make a PLT entry if necessary. | |
1358 | if (gsym->needs_plt_entry()) | |
1359 | target->make_plt_entry(symtab, layout, gsym); | |
1360 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1361 | int flags = Symbol::NON_PIC_REF; |
1362 | if (gsym->type() == elfcpp::STT_FUNC) | |
1363 | flags |= Symbol::FUNCTION_CALL; | |
1364 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1365 | { |
d61c6bd4 ILT |
1366 | if (target->may_need_copy_reloc(gsym)) |
1367 | { | |
12c0daef | 1368 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1369 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1370 | } |
86849f1f | 1371 | else |
d61c6bd4 | 1372 | { |
a036edd8 | 1373 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1374 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1375 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1376 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1377 | reloc.get_r_addend()); |
1378 | } | |
86849f1f | 1379 | } |
d61c6bd4 | 1380 | } |
2e30d253 ILT |
1381 | break; |
1382 | ||
ff006520 | 1383 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1384 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1385 | case elfcpp::R_X86_64_GOTPCREL64: |
1386 | case elfcpp::R_X86_64_GOTPCREL: | |
1387 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1388 | { |
1389 | // The symbol requires a GOT entry. | |
1390 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1391 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1392 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1393 | else |
1394 | { | |
2e30d253 ILT |
1395 | // If this symbol is not fully resolved, we need to add a |
1396 | // dynamic relocation for it. | |
7bf1f802 | 1397 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1398 | if (gsym->is_from_dynobj() |
1399 | || gsym->is_undefined() | |
1400 | || gsym->is_preemptible()) | |
0a65a3a7 | 1401 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1402 | elfcpp::R_X86_64_GLOB_DAT); |
1403 | else | |
2e30d253 | 1404 | { |
0a65a3a7 CC |
1405 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1406 | rela_dyn->add_global_relative( | |
1407 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1408 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1409 | } |
1410 | } | |
ee9e9e86 ILT |
1411 | // For GOTPLT64, we also need a PLT entry (but only if the |
1412 | // symbol is not fully resolved). | |
1413 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1414 | && !gsym->final_value_is_known()) | |
1415 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1416 | } |
1417 | break; | |
1418 | ||
1419 | case elfcpp::R_X86_64_PLT32: | |
1420 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1421 | // Otherwise we need a PLT entry. | |
1422 | if (gsym->final_value_is_known()) | |
1423 | break; | |
96f2030e ILT |
1424 | // If building a shared library, we can also skip the PLT entry |
1425 | // if the symbol is defined in the output file and is protected | |
1426 | // or hidden. | |
1427 | if (gsym->is_defined() | |
1428 | && !gsym->is_from_dynobj() | |
1429 | && !gsym->is_preemptible()) | |
1430 | break; | |
2e30d253 ILT |
1431 | target->make_plt_entry(symtab, layout, gsym); |
1432 | break; | |
1433 | ||
fdc2f80f | 1434 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1435 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1436 | case elfcpp::R_X86_64_GOTPC64: |
1437 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1438 | // We need a GOT section. |
1439 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1440 | // For PLTOFF64, we also need a PLT entry (but only if the |
1441 | // symbol is not fully resolved). | |
1442 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1443 | && !gsym->final_value_is_known()) | |
1444 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1445 | break; |
1446 | ||
2e30d253 ILT |
1447 | case elfcpp::R_X86_64_COPY: |
1448 | case elfcpp::R_X86_64_GLOB_DAT: | |
1449 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1450 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1451 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1452 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1453 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1454 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1455 | gold_error(_("%s: unexpected reloc %u in object file"), |
1456 | object->name().c_str(), r_type); | |
2e30d253 | 1457 | break; |
2e30d253 | 1458 | |
d61c17ea | 1459 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1460 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1461 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1462 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1463 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1464 | case elfcpp::R_X86_64_DTPOFF32: |
1465 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1466 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1467 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1468 | { |
1469 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1470 | const tls::Tls_optimization optimized_type |
1471 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1472 | switch (r_type) |
1473 | { | |
56622147 | 1474 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1475 | if (optimized_type == tls::TLSOPT_NONE) |
1476 | { | |
1477 | // Create a pair of GOT entries for the module index and | |
1478 | // dtv-relative offset. | |
1479 | Output_data_got<64, false>* got | |
1480 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1481 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1482 | target->rela_dyn_section(layout), | |
1483 | elfcpp::R_X86_64_DTPMOD64, | |
1484 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1485 | } |
1486 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1487 | { | |
1488 | // Create a GOT entry for the tp-relative offset. | |
1489 | Output_data_got<64, false>* got | |
1490 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1491 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1492 | target->rela_dyn_section(layout), |
1493 | elfcpp::R_X86_64_TPOFF64); | |
1494 | } | |
1495 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1496 | unsupported_reloc_global(object, r_type, gsym); | |
1497 | break; | |
1498 | ||
56622147 | 1499 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1500 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1501 | if (optimized_type == tls::TLSOPT_NONE) |
1502 | { | |
1503 | // Create reserved PLT and GOT entries for the resolver. | |
1504 | target->reserve_tlsdesc_entries(symtab, layout); | |
1505 | ||
1506 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1507 | Output_data_got<64, false>* got | |
1508 | = target->got_section(symtab, layout); | |
1509 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1510 | target->rela_dyn_section(layout), | |
1511 | elfcpp::R_X86_64_TLSDESC, 0); | |
1512 | } | |
1513 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1514 | { | |
1515 | // Create a GOT entry for the tp-relative offset. | |
1516 | Output_data_got<64, false>* got | |
1517 | = target->got_section(symtab, layout); | |
1518 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1519 | target->rela_dyn_section(layout), | |
1520 | elfcpp::R_X86_64_TPOFF64); | |
1521 | } | |
1522 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1523 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1524 | break; |
1525 | ||
c2b45e22 CC |
1526 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1527 | break; | |
1528 | ||
e041f13d | 1529 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1530 | if (optimized_type == tls::TLSOPT_NONE) |
1531 | { | |
1532 | // Create a GOT entry for the module index. | |
31d60480 | 1533 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1534 | } |
1535 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1536 | unsupported_reloc_global(object, r_type, gsym); | |
1537 | break; | |
1538 | ||
0ffd9845 ILT |
1539 | case elfcpp::R_X86_64_DTPOFF32: |
1540 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1541 | break; |
1542 | ||
56622147 | 1543 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1544 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1545 | if (optimized_type == tls::TLSOPT_NONE) |
1546 | { | |
1547 | // Create a GOT entry for the tp-relative offset. | |
1548 | Output_data_got<64, false>* got | |
1549 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1550 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1551 | target->rela_dyn_section(layout), |
1552 | elfcpp::R_X86_64_TPOFF64); | |
1553 | } | |
1554 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1555 | unsupported_reloc_global(object, r_type, gsym); |
1556 | break; | |
0ffd9845 | 1557 | |
56622147 | 1558 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1559 | layout->set_has_static_tls(); |
8851ecca | 1560 | if (parameters->options().shared()) |
7bf1f802 | 1561 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1562 | break; |
e041f13d ILT |
1563 | |
1564 | default: | |
1565 | gold_unreachable(); | |
2e30d253 ILT |
1566 | } |
1567 | } | |
1568 | break; | |
fdc2f80f ILT |
1569 | |
1570 | case elfcpp::R_X86_64_SIZE32: | |
1571 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1572 | default: |
75f2446e | 1573 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1574 | object->name().c_str(), r_type, |
1575 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1576 | break; |
1577 | } | |
1578 | } | |
1579 | ||
6d03d481 ST |
1580 | void |
1581 | Target_x86_64::gc_process_relocs(const General_options& options, | |
1582 | Symbol_table* symtab, | |
1583 | Layout* layout, | |
1584 | Sized_relobj<64, false>* object, | |
1585 | unsigned int data_shndx, | |
1586 | unsigned int sh_type, | |
1587 | const unsigned char* prelocs, | |
1588 | size_t reloc_count, | |
1589 | Output_section* output_section, | |
1590 | bool needs_special_offset_handling, | |
1591 | size_t local_symbol_count, | |
1592 | const unsigned char* plocal_symbols) | |
1593 | { | |
1594 | ||
1595 | if (sh_type == elfcpp::SHT_REL) | |
1596 | { | |
1597 | return; | |
1598 | } | |
1599 | ||
1600 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1601 | Target_x86_64::Scan>( | |
1602 | options, | |
1603 | symtab, | |
1604 | layout, | |
1605 | this, | |
1606 | object, | |
1607 | data_shndx, | |
1608 | prelocs, | |
1609 | reloc_count, | |
1610 | output_section, | |
1611 | needs_special_offset_handling, | |
1612 | local_symbol_count, | |
1613 | plocal_symbols); | |
1614 | ||
1615 | } | |
2e30d253 ILT |
1616 | // Scan relocations for a section. |
1617 | ||
1618 | void | |
1619 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1620 | Symbol_table* symtab, |
1621 | Layout* layout, | |
1622 | Sized_relobj<64, false>* object, | |
1623 | unsigned int data_shndx, | |
1624 | unsigned int sh_type, | |
1625 | const unsigned char* prelocs, | |
1626 | size_t reloc_count, | |
730cdc88 ILT |
1627 | Output_section* output_section, |
1628 | bool needs_special_offset_handling, | |
d61c17ea | 1629 | size_t local_symbol_count, |
730cdc88 | 1630 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1631 | { |
1632 | if (sh_type == elfcpp::SHT_REL) | |
1633 | { | |
75f2446e ILT |
1634 | gold_error(_("%s: unsupported REL reloc section"), |
1635 | object->name().c_str()); | |
1636 | return; | |
2e30d253 ILT |
1637 | } |
1638 | ||
1639 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1640 | Target_x86_64::Scan>( | |
1641 | options, | |
1642 | symtab, | |
1643 | layout, | |
1644 | this, | |
1645 | object, | |
1646 | data_shndx, | |
1647 | prelocs, | |
1648 | reloc_count, | |
730cdc88 ILT |
1649 | output_section, |
1650 | needs_special_offset_handling, | |
2e30d253 | 1651 | local_symbol_count, |
730cdc88 | 1652 | plocal_symbols); |
2e30d253 ILT |
1653 | } |
1654 | ||
1655 | // Finalize the sections. | |
1656 | ||
1657 | void | |
1658 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1659 | { | |
1660 | // Fill in some more dynamic tags. | |
1661 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1662 | if (odyn != NULL) | |
1663 | { | |
1664 | if (this->got_plt_ != NULL) | |
1665 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1666 | ||
1667 | if (this->plt_ != NULL) | |
1668 | { | |
1669 | const Output_data* od = this->plt_->rel_plt(); | |
1670 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1671 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1672 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1673 | if (this->plt_->has_tlsdesc_entry()) |
1674 | { | |
1675 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1676 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1677 | this->got_->finalize_data_size(); | |
1678 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1679 | this->plt_, plt_offset); | |
1680 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1681 | this->got_, got_offset); | |
1682 | } | |
2e30d253 ILT |
1683 | } |
1684 | ||
0ffd9845 | 1685 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1686 | { |
0ffd9845 | 1687 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1688 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1689 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1690 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1691 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1692 | } |
1693 | ||
8851ecca | 1694 | if (!parameters->options().shared()) |
2e30d253 ILT |
1695 | { |
1696 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1697 | // linker at run time, and used by the debugger. | |
1698 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1699 | } | |
1700 | } | |
1701 | ||
1702 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1703 | // relocs. | |
12c0daef ILT |
1704 | if (this->copy_relocs_.any_saved_relocs()) |
1705 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1706 | } |
1707 | ||
1708 | // Perform a relocation. | |
1709 | ||
1710 | inline bool | |
1711 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1712 | Target_x86_64* target, | |
031cdbed | 1713 | Output_section*, |
2e30d253 | 1714 | size_t relnum, |
0ffd9845 | 1715 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1716 | unsigned int r_type, |
1717 | const Sized_symbol<64>* gsym, | |
1718 | const Symbol_value<64>* psymval, | |
1719 | unsigned char* view, | |
1720 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1721 | section_size_type view_size) |
2e30d253 ILT |
1722 | { |
1723 | if (this->skip_call_tls_get_addr_) | |
1724 | { | |
5efc7cd2 CC |
1725 | if ((r_type != elfcpp::R_X86_64_PLT32 |
1726 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 1727 | || gsym == NULL |
0ffd9845 | 1728 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1729 | { |
75f2446e ILT |
1730 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1731 | _("missing expected TLS relocation")); | |
1732 | } | |
1733 | else | |
1734 | { | |
1735 | this->skip_call_tls_get_addr_ = false; | |
1736 | return false; | |
2e30d253 | 1737 | } |
2e30d253 ILT |
1738 | } |
1739 | ||
1740 | // Pick the value to use for symbols defined in shared objects. | |
1741 | Symbol_value<64> symval; | |
96f2030e | 1742 | if (gsym != NULL |
de4c45bd ILT |
1743 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1744 | || r_type == elfcpp::R_X86_64_PC32 | |
1745 | || r_type == elfcpp::R_X86_64_PC16 | |
1746 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1747 | { |
1748 | symval.set_output_value(target->plt_section()->address() | |
1749 | + gsym->plt_offset()); | |
1750 | psymval = &symval; | |
1751 | } | |
1752 | ||
1753 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1754 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1755 | ||
1756 | // Get the GOT offset if needed. | |
96f2030e ILT |
1757 | // The GOT pointer points to the end of the GOT section. |
1758 | // We need to subtract the size of the GOT section to get | |
1759 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1760 | bool have_got_offset = false; |
1761 | unsigned int got_offset = 0; | |
1762 | switch (r_type) | |
1763 | { | |
1764 | case elfcpp::R_X86_64_GOT32: | |
1765 | case elfcpp::R_X86_64_GOT64: | |
1766 | case elfcpp::R_X86_64_GOTPLT64: | |
1767 | case elfcpp::R_X86_64_GOTPCREL: | |
1768 | case elfcpp::R_X86_64_GOTPCREL64: | |
1769 | if (gsym != NULL) | |
1770 | { | |
0a65a3a7 CC |
1771 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1772 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1773 | } |
1774 | else | |
1775 | { | |
1776 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1777 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1778 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1779 | - target->got_size()); | |
0ffd9845 ILT |
1780 | } |
1781 | have_got_offset = true; | |
1782 | break; | |
1783 | ||
1784 | default: | |
1785 | break; | |
1786 | } | |
2e30d253 ILT |
1787 | |
1788 | switch (r_type) | |
1789 | { | |
1790 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1791 | case elfcpp::R_386_GNU_VTINHERIT: |
1792 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1793 | break; |
1794 | ||
1795 | case elfcpp::R_X86_64_64: | |
1796 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1797 | break; | |
1798 | ||
1799 | case elfcpp::R_X86_64_PC64: | |
1800 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1801 | address); | |
1802 | break; | |
1803 | ||
1804 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1805 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1806 | // uint64_t x = value + addend; | |
1807 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1808 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1809 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1810 | break; | |
1811 | ||
1812 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1813 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1814 | // int64_t x = value + addend; // note this quantity is signed! | |
1815 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1816 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1817 | break; | |
1818 | ||
1819 | case elfcpp::R_X86_64_PC32: | |
1820 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1821 | address); | |
1822 | break; | |
1823 | ||
1824 | case elfcpp::R_X86_64_16: | |
1825 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1826 | break; | |
1827 | ||
1828 | case elfcpp::R_X86_64_PC16: | |
1829 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1830 | address); | |
1831 | break; | |
1832 | ||
1833 | case elfcpp::R_X86_64_8: | |
1834 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1835 | break; | |
1836 | ||
1837 | case elfcpp::R_X86_64_PC8: | |
1838 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1839 | address); | |
1840 | break; | |
1841 | ||
1842 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1843 | gold_assert(gsym == NULL |
1844 | || gsym->has_plt_offset() | |
99f8faca ILT |
1845 | || gsym->final_value_is_known() |
1846 | || (gsym->is_defined() | |
1847 | && !gsym->is_from_dynobj() | |
1848 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1849 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1850 | // behaves differently because psymval was set to point to | |
1851 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1852 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1853 | address); | |
1854 | break; | |
1855 | ||
ee9e9e86 ILT |
1856 | case elfcpp::R_X86_64_PLTOFF64: |
1857 | { | |
1858 | gold_assert(gsym); | |
1859 | gold_assert(gsym->has_plt_offset() | |
1860 | || gsym->final_value_is_known()); | |
1861 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1862 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1863 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1864 | addend - got_address); | |
ee9e9e86 ILT |
1865 | } |
1866 | ||
2e30d253 | 1867 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1868 | gold_assert(have_got_offset); |
1869 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1870 | break; |
1871 | ||
e822f2b1 ILT |
1872 | case elfcpp::R_X86_64_GOTPC32: |
1873 | { | |
1874 | gold_assert(gsym); | |
1875 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1876 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1877 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1878 | } | |
1879 | break; | |
1880 | ||
1881 | case elfcpp::R_X86_64_GOT64: | |
1882 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1883 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1884 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1885 | gold_assert(have_got_offset); |
1886 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1887 | break; |
1888 | ||
1889 | case elfcpp::R_X86_64_GOTPC64: | |
1890 | { | |
1891 | gold_assert(gsym); | |
1892 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1893 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1894 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1895 | } | |
1896 | break; | |
1897 | ||
2e30d253 ILT |
1898 | case elfcpp::R_X86_64_GOTOFF64: |
1899 | { | |
1900 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1901 | value = (psymval->value(object, 0) | |
96f2030e | 1902 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1903 | Relocate_functions<64, false>::rela64(view, value, addend); |
1904 | } | |
1905 | break; | |
1906 | ||
1907 | case elfcpp::R_X86_64_GOTPCREL: | |
1908 | { | |
0ffd9845 ILT |
1909 | gold_assert(have_got_offset); |
1910 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1911 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1912 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1913 | } |
1914 | break; | |
1915 | ||
e822f2b1 ILT |
1916 | case elfcpp::R_X86_64_GOTPCREL64: |
1917 | { | |
0ffd9845 ILT |
1918 | gold_assert(have_got_offset); |
1919 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1920 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1921 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1922 | } |
1923 | break; | |
1924 | ||
2e30d253 ILT |
1925 | case elfcpp::R_X86_64_COPY: |
1926 | case elfcpp::R_X86_64_GLOB_DAT: | |
1927 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1928 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1929 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1930 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1931 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1932 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1933 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1934 | _("unexpected reloc %u in object file"), | |
1935 | r_type); | |
2e30d253 ILT |
1936 | break; |
1937 | ||
d61c17ea | 1938 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1939 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1940 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1941 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1942 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1943 | case elfcpp::R_X86_64_DTPOFF32: |
1944 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1945 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1946 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1947 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1948 | view, address, view_size); | |
2e30d253 | 1949 | break; |
2e30d253 | 1950 | |
fdc2f80f ILT |
1951 | case elfcpp::R_X86_64_SIZE32: |
1952 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1953 | default: |
75f2446e ILT |
1954 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1955 | _("unsupported reloc %u"), | |
1956 | r_type); | |
2e30d253 ILT |
1957 | break; |
1958 | } | |
1959 | ||
1960 | return true; | |
1961 | } | |
1962 | ||
1963 | // Perform a TLS relocation. | |
1964 | ||
1965 | inline void | |
d61c17ea | 1966 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1967 | Target_x86_64* target, |
d61c17ea | 1968 | size_t relnum, |
72ec2876 | 1969 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1970 | unsigned int r_type, |
1971 | const Sized_symbol<64>* gsym, | |
1972 | const Symbol_value<64>* psymval, | |
1973 | unsigned char* view, | |
6a41d30b | 1974 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1975 | section_size_type view_size) |
2e30d253 | 1976 | { |
2e30d253 | 1977 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1978 | |
1979 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1980 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1981 | |
1982 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1983 | ||
1984 | const bool is_final = (gsym == NULL | |
8851ecca | 1985 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1986 | : gsym->final_value_is_known()); |
e041f13d ILT |
1987 | const tls::Tls_optimization optimized_type |
1988 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1989 | switch (r_type) |
1990 | { | |
56622147 | 1991 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 1992 | this->saw_tls_block_reloc_ = true; |
e041f13d | 1993 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1994 | { |
7bf1f802 | 1995 | gold_assert(tls_segment != NULL); |
2e30d253 | 1996 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1997 | rela, r_type, value, view, |
2e30d253 ILT |
1998 | view_size); |
1999 | break; | |
2000 | } | |
7bf1f802 ILT |
2001 | else |
2002 | { | |
c2b45e22 CC |
2003 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2004 | ? GOT_TYPE_TLS_OFFSET | |
2005 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2006 | unsigned int got_offset; |
2007 | if (gsym != NULL) | |
2008 | { | |
c2b45e22 CC |
2009 | gold_assert(gsym->has_got_offset(got_type)); |
2010 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2011 | } |
2012 | else | |
2013 | { | |
2014 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2015 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2016 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2017 | - target->got_size()); |
2018 | } | |
2019 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2020 | { | |
2021 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2022 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2023 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2024 | value, view, address, view_size); |
7bf1f802 ILT |
2025 | break; |
2026 | } | |
2027 | else if (optimized_type == tls::TLSOPT_NONE) | |
2028 | { | |
2029 | // Relocate the field with the offset of the pair of GOT | |
2030 | // entries. | |
6a41d30b ILT |
2031 | value = target->got_plt_section()->address() + got_offset; |
2032 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2033 | address); | |
7bf1f802 ILT |
2034 | break; |
2035 | } | |
2036 | } | |
72ec2876 | 2037 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2038 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2039 | break; |
2040 | ||
c2b45e22 CC |
2041 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2042 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 2043 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
2044 | if (optimized_type == tls::TLSOPT_TO_LE) |
2045 | { | |
2046 | gold_assert(tls_segment != NULL); | |
2047 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2048 | rela, r_type, value, view, | |
2049 | view_size); | |
2050 | break; | |
2051 | } | |
2052 | else | |
2053 | { | |
2054 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2055 | ? GOT_TYPE_TLS_OFFSET | |
2056 | : GOT_TYPE_TLS_DESC); | |
2057 | unsigned int got_offset; | |
2058 | if (gsym != NULL) | |
2059 | { | |
2060 | gold_assert(gsym->has_got_offset(got_type)); | |
2061 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
2062 | } | |
2063 | else | |
2064 | { | |
2065 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2066 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
2067 | got_offset = (object->local_got_offset(r_sym, got_type) | |
2068 | - target->got_size()); | |
2069 | } | |
2070 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2071 | { | |
2072 | gold_assert(tls_segment != NULL); | |
2073 | value = target->got_plt_section()->address() + got_offset; | |
2074 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2075 | rela, r_type, value, view, address, | |
2076 | view_size); | |
2077 | break; | |
2078 | } | |
2079 | else if (optimized_type == tls::TLSOPT_NONE) | |
2080 | { | |
2081 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2082 | { | |
2083 | // Relocate the field with the offset of the pair of GOT | |
2084 | // entries. | |
2085 | value = target->got_plt_section()->address() + got_offset; | |
2086 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2087 | address); | |
2088 | } | |
2089 | break; | |
2090 | } | |
2091 | } | |
2092 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2093 | _("unsupported reloc %u"), r_type); | |
2094 | break; | |
2095 | ||
56622147 | 2096 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2097 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2098 | if (optimized_type == tls::TLSOPT_TO_LE) |
2099 | { | |
7bf1f802 | 2100 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2101 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2102 | value, view, view_size); | |
2103 | break; | |
e041f13d | 2104 | } |
7bf1f802 ILT |
2105 | else if (optimized_type == tls::TLSOPT_NONE) |
2106 | { | |
2107 | // Relocate the field with the offset of the GOT entry for | |
2108 | // the module index. | |
2109 | unsigned int got_offset; | |
31d60480 ILT |
2110 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2111 | - target->got_size()); | |
6a41d30b ILT |
2112 | value = target->got_plt_section()->address() + got_offset; |
2113 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2114 | address); | |
7bf1f802 ILT |
2115 | break; |
2116 | } | |
72ec2876 | 2117 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2118 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2119 | break; |
0ffd9845 ILT |
2120 | |
2121 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 2122 | gold_assert(tls_segment != NULL); |
e041f13d | 2123 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2124 | { |
2125 | // This relocation type is used in debugging information. | |
2126 | // In that case we need to not optimize the value. If we | |
2127 | // haven't seen a TLSLD reloc, then we assume we should not | |
2128 | // optimize this reloc. | |
2129 | if (this->saw_tls_block_reloc_) | |
2130 | value -= tls_segment->memsz(); | |
2131 | } | |
d85c80a3 | 2132 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2133 | break; |
2134 | ||
2135 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 2136 | gold_assert(tls_segment != NULL); |
e041f13d | 2137 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2138 | { |
2139 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2140 | if (this->saw_tls_block_reloc_) | |
2141 | value -= tls_segment->memsz(); | |
2142 | } | |
d85c80a3 | 2143 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2144 | break; |
2e30d253 | 2145 | |
56622147 ILT |
2146 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2147 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2148 | { | |
7bf1f802 | 2149 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2150 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2151 | rela, r_type, value, view, | |
2152 | view_size); | |
2153 | break; | |
2154 | } | |
7bf1f802 ILT |
2155 | else if (optimized_type == tls::TLSOPT_NONE) |
2156 | { | |
2157 | // Relocate the field with the offset of the GOT entry for | |
2158 | // the tp-relative offset of the symbol. | |
2159 | unsigned int got_offset; | |
2160 | if (gsym != NULL) | |
2161 | { | |
0a65a3a7 CC |
2162 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2163 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2164 | - target->got_size()); | |
7bf1f802 ILT |
2165 | } |
2166 | else | |
2167 | { | |
2168 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2169 | gold_assert(object->local_has_got_offset(r_sym, |
2170 | GOT_TYPE_TLS_OFFSET)); | |
2171 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2172 | - target->got_size()); |
2173 | } | |
6a41d30b ILT |
2174 | value = target->got_plt_section()->address() + got_offset; |
2175 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2176 | break; |
2177 | } | |
56622147 ILT |
2178 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2179 | _("unsupported reloc type %u"), | |
2180 | r_type); | |
2181 | break; | |
0ffd9845 | 2182 | |
56622147 | 2183 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2184 | value -= tls_segment->memsz(); |
d85c80a3 | 2185 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2186 | break; |
2e30d253 | 2187 | } |
2e30d253 ILT |
2188 | } |
2189 | ||
7bf1f802 ILT |
2190 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2191 | // Initial-Exec. | |
2192 | ||
2193 | inline void | |
2194 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2195 | size_t relnum, | |
c2b45e22 | 2196 | Output_segment*, |
7bf1f802 ILT |
2197 | const elfcpp::Rela<64, false>& rela, |
2198 | unsigned int, | |
2199 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2200 | unsigned char* view, | |
c2b45e22 | 2201 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2202 | section_size_type view_size) |
7bf1f802 ILT |
2203 | { |
2204 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2205 | // .word 0x6666; rex64; call __tls_get_addr | |
2206 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2207 | ||
2208 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2209 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2210 | ||
2211 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2212 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2213 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2214 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2215 | ||
2216 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2217 | ||
c2b45e22 CC |
2218 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2219 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2220 | |
2221 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2222 | // We can skip it. | |
2223 | this->skip_call_tls_get_addr_ = true; | |
2224 | } | |
2225 | ||
e041f13d | 2226 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2227 | // Local-Exec. |
2228 | ||
2229 | inline void | |
d61c17ea ILT |
2230 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2231 | size_t relnum, | |
2232 | Output_segment* tls_segment, | |
72ec2876 | 2233 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2234 | unsigned int, |
2235 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2236 | unsigned char* view, | |
fe8718a4 | 2237 | section_size_type view_size) |
2e30d253 | 2238 | { |
0ffd9845 ILT |
2239 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2240 | // .word 0x6666; rex64; call __tls_get_addr | |
2241 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2242 | |
72ec2876 ILT |
2243 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2244 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2245 | |
72ec2876 ILT |
2246 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2247 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2248 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2249 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2250 | |
0ffd9845 | 2251 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2252 | |
6a41d30b | 2253 | value -= tls_segment->memsz(); |
0ffd9845 | 2254 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2255 | |
2256 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2257 | // We can skip it. | |
2258 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2259 | } |
2260 | ||
c2b45e22 CC |
2261 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2262 | ||
2263 | inline void | |
2264 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2265 | const Relocate_info<64, false>* relinfo, | |
2266 | size_t relnum, | |
2267 | Output_segment*, | |
2268 | const elfcpp::Rela<64, false>& rela, | |
2269 | unsigned int r_type, | |
2270 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2271 | unsigned char* view, | |
2272 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2273 | section_size_type view_size) | |
2274 | { | |
2275 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2276 | { | |
2277 | // leaq foo@tlsdesc(%rip), %rax | |
2278 | // ==> movq foo@gottpoff(%rip), %rax | |
2279 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2280 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2281 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2282 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2283 | view[-2] = 0x8b; | |
2284 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2285 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2286 | } | |
2287 | else | |
2288 | { | |
2289 | // call *foo@tlscall(%rax) | |
2290 | // ==> nop; nop | |
2291 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2292 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2293 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2294 | view[0] == 0xff && view[1] == 0x10); | |
2295 | view[0] = 0x66; | |
2296 | view[1] = 0x90; | |
2297 | } | |
2298 | } | |
2299 | ||
2300 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2301 | ||
2302 | inline void | |
2303 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2304 | const Relocate_info<64, false>* relinfo, | |
2305 | size_t relnum, | |
2306 | Output_segment* tls_segment, | |
2307 | const elfcpp::Rela<64, false>& rela, | |
2308 | unsigned int r_type, | |
2309 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2310 | unsigned char* view, | |
2311 | section_size_type view_size) | |
2312 | { | |
2313 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2314 | { | |
2315 | // leaq foo@tlsdesc(%rip), %rax | |
2316 | // ==> movq foo@tpoff, %rax | |
2317 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2318 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2319 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2320 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2321 | view[-2] = 0xc7; | |
2322 | view[-1] = 0xc0; | |
2323 | value -= tls_segment->memsz(); | |
2324 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2325 | } | |
2326 | else | |
2327 | { | |
2328 | // call *foo@tlscall(%rax) | |
2329 | // ==> nop; nop | |
2330 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2331 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2332 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2333 | view[0] == 0xff && view[1] == 0x10); | |
2334 | view[0] = 0x66; | |
2335 | view[1] = 0x90; | |
2336 | } | |
2337 | } | |
2338 | ||
2e30d253 | 2339 | inline void |
72ec2876 ILT |
2340 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2341 | size_t relnum, | |
2342 | Output_segment*, | |
2343 | const elfcpp::Rela<64, false>& rela, | |
2344 | unsigned int, | |
2345 | elfcpp::Elf_types<64>::Elf_Addr, | |
2346 | unsigned char* view, | |
fe8718a4 | 2347 | section_size_type view_size) |
2e30d253 | 2348 | { |
72ec2876 ILT |
2349 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2350 | // ... leq foo@dtpoff(%rax),%reg | |
2351 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2352 | |
72ec2876 ILT |
2353 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2354 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2355 | |
72ec2876 ILT |
2356 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2357 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2358 | ||
2359 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2360 | ||
2361 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2362 | ||
2363 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2364 | // We can skip it. | |
2365 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2366 | } |
2367 | ||
56622147 ILT |
2368 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2369 | // Local-Exec. | |
2370 | ||
2371 | inline void | |
2372 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2373 | size_t relnum, | |
2374 | Output_segment* tls_segment, | |
2375 | const elfcpp::Rela<64, false>& rela, | |
2376 | unsigned int, | |
2377 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2378 | unsigned char* view, | |
fe8718a4 | 2379 | section_size_type view_size) |
56622147 ILT |
2380 | { |
2381 | // We need to examine the opcodes to figure out which instruction we | |
2382 | // are looking at. | |
2383 | ||
2384 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2385 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2386 | ||
2387 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2388 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2389 | ||
2390 | unsigned char op1 = view[-3]; | |
2391 | unsigned char op2 = view[-2]; | |
2392 | unsigned char op3 = view[-1]; | |
2393 | unsigned char reg = op3 >> 3; | |
2394 | ||
2395 | if (op2 == 0x8b) | |
2396 | { | |
2397 | // movq | |
2398 | if (op1 == 0x4c) | |
2399 | view[-3] = 0x49; | |
2400 | view[-2] = 0xc7; | |
2401 | view[-1] = 0xc0 | reg; | |
2402 | } | |
2403 | else if (reg == 4) | |
2404 | { | |
2405 | // Special handling for %rsp. | |
2406 | if (op1 == 0x4c) | |
2407 | view[-3] = 0x49; | |
2408 | view[-2] = 0x81; | |
2409 | view[-1] = 0xc0 | reg; | |
2410 | } | |
2411 | else | |
2412 | { | |
2413 | // addq | |
2414 | if (op1 == 0x4c) | |
2415 | view[-3] = 0x4d; | |
2416 | view[-2] = 0x8d; | |
2417 | view[-1] = 0x80 | reg | (reg << 3); | |
2418 | } | |
2419 | ||
6a41d30b | 2420 | value -= tls_segment->memsz(); |
56622147 ILT |
2421 | Relocate_functions<64, false>::rela32(view, value, 0); |
2422 | } | |
2423 | ||
2e30d253 ILT |
2424 | // Relocate section data. |
2425 | ||
2426 | void | |
2427 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2428 | unsigned int sh_type, |
2429 | const unsigned char* prelocs, | |
2430 | size_t reloc_count, | |
730cdc88 ILT |
2431 | Output_section* output_section, |
2432 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2433 | unsigned char* view, |
2434 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2435 | section_size_type view_size) |
2e30d253 ILT |
2436 | { |
2437 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2438 | ||
2439 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2440 | Target_x86_64::Relocate>( | |
2441 | relinfo, | |
2442 | this, | |
2443 | prelocs, | |
2444 | reloc_count, | |
730cdc88 ILT |
2445 | output_section, |
2446 | needs_special_offset_handling, | |
2e30d253 ILT |
2447 | view, |
2448 | address, | |
2449 | view_size); | |
2450 | } | |
2451 | ||
6a74a719 ILT |
2452 | // Return the size of a relocation while scanning during a relocatable |
2453 | // link. | |
2454 | ||
2455 | unsigned int | |
2456 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2457 | unsigned int r_type, | |
2458 | Relobj* object) | |
2459 | { | |
2460 | switch (r_type) | |
2461 | { | |
2462 | case elfcpp::R_X86_64_NONE: | |
2463 | case elfcpp::R_386_GNU_VTINHERIT: | |
2464 | case elfcpp::R_386_GNU_VTENTRY: | |
2465 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2466 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2467 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2468 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2469 | case elfcpp::R_X86_64_DTPOFF32: | |
2470 | case elfcpp::R_X86_64_DTPOFF64: | |
2471 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2472 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2473 | return 0; | |
2474 | ||
2475 | case elfcpp::R_X86_64_64: | |
2476 | case elfcpp::R_X86_64_PC64: | |
2477 | case elfcpp::R_X86_64_GOTOFF64: | |
2478 | case elfcpp::R_X86_64_GOTPC64: | |
2479 | case elfcpp::R_X86_64_PLTOFF64: | |
2480 | case elfcpp::R_X86_64_GOT64: | |
2481 | case elfcpp::R_X86_64_GOTPCREL64: | |
2482 | case elfcpp::R_X86_64_GOTPCREL: | |
2483 | case elfcpp::R_X86_64_GOTPLT64: | |
2484 | return 8; | |
2485 | ||
2486 | case elfcpp::R_X86_64_32: | |
2487 | case elfcpp::R_X86_64_32S: | |
2488 | case elfcpp::R_X86_64_PC32: | |
2489 | case elfcpp::R_X86_64_PLT32: | |
2490 | case elfcpp::R_X86_64_GOTPC32: | |
2491 | case elfcpp::R_X86_64_GOT32: | |
2492 | return 4; | |
2493 | ||
2494 | case elfcpp::R_X86_64_16: | |
2495 | case elfcpp::R_X86_64_PC16: | |
2496 | return 2; | |
2497 | ||
2498 | case elfcpp::R_X86_64_8: | |
2499 | case elfcpp::R_X86_64_PC8: | |
2500 | return 1; | |
2501 | ||
2502 | case elfcpp::R_X86_64_COPY: | |
2503 | case elfcpp::R_X86_64_GLOB_DAT: | |
2504 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2505 | case elfcpp::R_X86_64_RELATIVE: | |
2506 | // These are outstanding tls relocs, which are unexpected when linking | |
2507 | case elfcpp::R_X86_64_TPOFF64: | |
2508 | case elfcpp::R_X86_64_DTPMOD64: | |
2509 | case elfcpp::R_X86_64_TLSDESC: | |
2510 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2511 | return 0; | |
2512 | ||
2513 | case elfcpp::R_X86_64_SIZE32: | |
2514 | case elfcpp::R_X86_64_SIZE64: | |
2515 | default: | |
2516 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2517 | return 0; | |
2518 | } | |
2519 | } | |
2520 | ||
2521 | // Scan the relocs during a relocatable link. | |
2522 | ||
2523 | void | |
2524 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2525 | Symbol_table* symtab, | |
2526 | Layout* layout, | |
2527 | Sized_relobj<64, false>* object, | |
2528 | unsigned int data_shndx, | |
2529 | unsigned int sh_type, | |
2530 | const unsigned char* prelocs, | |
2531 | size_t reloc_count, | |
2532 | Output_section* output_section, | |
2533 | bool needs_special_offset_handling, | |
2534 | size_t local_symbol_count, | |
2535 | const unsigned char* plocal_symbols, | |
2536 | Relocatable_relocs* rr) | |
2537 | { | |
2538 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2539 | ||
2540 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2541 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2542 | ||
7019cd25 | 2543 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2544 | Scan_relocatable_relocs>( |
2545 | options, | |
2546 | symtab, | |
2547 | layout, | |
2548 | object, | |
2549 | data_shndx, | |
2550 | prelocs, | |
2551 | reloc_count, | |
2552 | output_section, | |
2553 | needs_special_offset_handling, | |
2554 | local_symbol_count, | |
2555 | plocal_symbols, | |
2556 | rr); | |
2557 | } | |
2558 | ||
2559 | // Relocate a section during a relocatable link. | |
2560 | ||
2561 | void | |
2562 | Target_x86_64::relocate_for_relocatable( | |
2563 | const Relocate_info<64, false>* relinfo, | |
2564 | unsigned int sh_type, | |
2565 | const unsigned char* prelocs, | |
2566 | size_t reloc_count, | |
2567 | Output_section* output_section, | |
2568 | off_t offset_in_output_section, | |
2569 | const Relocatable_relocs* rr, | |
2570 | unsigned char* view, | |
2571 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2572 | section_size_type view_size, | |
2573 | unsigned char* reloc_view, | |
2574 | section_size_type reloc_view_size) | |
2575 | { | |
2576 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2577 | ||
7019cd25 | 2578 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2579 | relinfo, |
2580 | prelocs, | |
2581 | reloc_count, | |
2582 | output_section, | |
2583 | offset_in_output_section, | |
2584 | rr, | |
2585 | view, | |
2586 | view_address, | |
2587 | view_size, | |
2588 | reloc_view, | |
2589 | reloc_view_size); | |
2590 | } | |
2591 | ||
4fb6c25d ILT |
2592 | // Return the value to use for a dynamic which requires special |
2593 | // treatment. This is how we support equality comparisons of function | |
2594 | // pointers across shared library boundaries, as described in the | |
2595 | // processor specific ABI supplement. | |
2596 | ||
2597 | uint64_t | |
2598 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2599 | { | |
2600 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2601 | return this->plt_section()->address() + gsym->plt_offset(); | |
2602 | } | |
2603 | ||
2e30d253 ILT |
2604 | // Return a string used to fill a code section with nops to take up |
2605 | // the specified length. | |
2606 | ||
2607 | std::string | |
8851ecca | 2608 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2609 | { |
2610 | if (length >= 16) | |
2611 | { | |
2612 | // Build a jmpq instruction to skip over the bytes. | |
2613 | unsigned char jmp[5]; | |
2614 | jmp[0] = 0xe9; | |
04bf7072 | 2615 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2616 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2617 | + std::string(length - 5, '\0')); | |
2618 | } | |
2619 | ||
2620 | // Nop sequences of various lengths. | |
2621 | const char nop1[1] = { 0x90 }; // nop | |
2622 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
2623 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
2624 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
2625 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
2626 | 0x00 }; | |
2627 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 2628 | 0x00, 0x00 }; |
1caf2c51 | 2629 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 2630 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2631 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
2632 | 0x00, 0x00, 0x00, 0x00 }; | |
2633 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
2634 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2635 | 0x00 }; |
1caf2c51 ILT |
2636 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
2637 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 2638 | 0x00, 0x00 }; |
1caf2c51 ILT |
2639 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
2640 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2641 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2642 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
2643 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2644 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
2645 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2646 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
2647 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 2648 | 0x00 }; |
1caf2c51 ILT |
2649 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2650 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
2651 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 2652 | 0x00, 0x00 }; |
1caf2c51 ILT |
2653 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
2654 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
2655 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2656 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
2657 | |
2658 | const char* nops[16] = { | |
2659 | NULL, | |
2660 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2661 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2662 | }; | |
2663 | ||
2664 | return std::string(nops[length], length); | |
2665 | } | |
2666 | ||
2667 | // The selector for x86_64 object files. | |
2668 | ||
36959681 | 2669 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
2670 | { |
2671 | public: | |
2672 | Target_selector_x86_64() | |
36959681 ILT |
2673 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
2674 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
2675 | { } |
2676 | ||
2677 | Target* | |
e96caa79 ILT |
2678 | do_instantiate_target() |
2679 | { return new Target_x86_64(); } | |
36959681 | 2680 | |
2e30d253 ILT |
2681 | }; |
2682 | ||
2e30d253 ILT |
2683 | Target_selector_x86_64 target_selector_x86_64; |
2684 | ||
2685 | } // End anonymous namespace. |