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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
ebdbb458 | 3 | // Copyright 2006, 2007, 2008 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" |
2e30d253 ILT |
40 | |
41 | namespace | |
42 | { | |
43 | ||
44 | using namespace gold; | |
45 | ||
46 | class Output_data_plt_x86_64; | |
47 | ||
48 | // The x86_64 target class. | |
d61c17ea ILT |
49 | // See the ABI at |
50 | // http://www.x86-64.org/documentation/abi.pdf | |
51 | // TLS info comes from | |
52 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 53 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 ILT |
54 | |
55 | class Target_x86_64 : public Sized_target<64, false> | |
56 | { | |
57 | public: | |
e822f2b1 ILT |
58 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
59 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
60 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
61 | ||
62 | Target_x86_64() | |
63 | : Sized_target<64, false>(&x86_64_info), | |
0ffd9845 | 64 | got_(NULL), plt_(NULL), got_plt_(NULL), rela_dyn_(NULL), |
12c0daef | 65 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), |
edfbb029 | 66 | got_mod_index_offset_(-1U), tls_base_symbol_defined_(false) |
2e30d253 ILT |
67 | { } |
68 | ||
69 | // Scan the relocations to look for symbol adjustments. | |
70 | void | |
71 | scan_relocs(const General_options& options, | |
72 | Symbol_table* symtab, | |
73 | Layout* layout, | |
74 | Sized_relobj<64, false>* object, | |
75 | unsigned int data_shndx, | |
76 | unsigned int sh_type, | |
77 | const unsigned char* prelocs, | |
78 | size_t reloc_count, | |
730cdc88 ILT |
79 | Output_section* output_section, |
80 | bool needs_special_offset_handling, | |
2e30d253 | 81 | size_t local_symbol_count, |
730cdc88 | 82 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
83 | |
84 | // Finalize the sections. | |
85 | void | |
86 | do_finalize_sections(Layout*); | |
87 | ||
4fb6c25d ILT |
88 | // Return the value to use for a dynamic which requires special |
89 | // treatment. | |
90 | uint64_t | |
91 | do_dynsym_value(const Symbol*) const; | |
92 | ||
2e30d253 ILT |
93 | // Relocate a section. |
94 | void | |
95 | relocate_section(const Relocate_info<64, false>*, | |
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 ILT |
101 | unsigned char* view, |
102 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
fe8718a4 | 103 | section_size_type view_size); |
2e30d253 | 104 | |
6a74a719 ILT |
105 | // Scan the relocs during a relocatable link. |
106 | void | |
107 | scan_relocatable_relocs(const General_options& options, | |
108 | Symbol_table* symtab, | |
109 | Layout* layout, | |
110 | Sized_relobj<64, false>* object, | |
111 | unsigned int data_shndx, | |
112 | unsigned int sh_type, | |
113 | const unsigned char* prelocs, | |
114 | size_t reloc_count, | |
115 | Output_section* output_section, | |
116 | bool needs_special_offset_handling, | |
117 | size_t local_symbol_count, | |
118 | const unsigned char* plocal_symbols, | |
119 | Relocatable_relocs*); | |
120 | ||
121 | // Relocate a section during a relocatable link. | |
122 | void | |
123 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
124 | unsigned int sh_type, | |
125 | const unsigned char* prelocs, | |
126 | size_t reloc_count, | |
127 | Output_section* output_section, | |
128 | off_t offset_in_output_section, | |
129 | const Relocatable_relocs*, | |
130 | unsigned char* view, | |
131 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
132 | section_size_type view_size, | |
133 | unsigned char* reloc_view, | |
134 | section_size_type reloc_view_size); | |
135 | ||
2e30d253 ILT |
136 | // Return a string used to fill a code section with nops. |
137 | std::string | |
8851ecca | 138 | do_code_fill(section_size_type length) const; |
2e30d253 | 139 | |
9a2d6984 ILT |
140 | // Return whether SYM is defined by the ABI. |
141 | bool | |
9c2d0ef9 | 142 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
143 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
144 | ||
96f2030e | 145 | // Return the size of the GOT section. |
fe8718a4 | 146 | section_size_type |
96f2030e ILT |
147 | got_size() |
148 | { | |
149 | gold_assert(this->got_ != NULL); | |
150 | return this->got_->data_size(); | |
151 | } | |
152 | ||
2e30d253 ILT |
153 | private: |
154 | // The class which scans relocations. | |
a036edd8 | 155 | class Scan |
2e30d253 | 156 | { |
a036edd8 ILT |
157 | public: |
158 | Scan() | |
159 | : issued_non_pic_error_(false) | |
160 | { } | |
161 | ||
2e30d253 ILT |
162 | inline void |
163 | local(const General_options& options, Symbol_table* symtab, | |
164 | Layout* layout, Target_x86_64* target, | |
165 | Sized_relobj<64, false>* object, | |
166 | unsigned int data_shndx, | |
07f397ab | 167 | Output_section* output_section, |
2e30d253 ILT |
168 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
169 | const elfcpp::Sym<64, false>& lsym); | |
170 | ||
171 | inline void | |
172 | global(const General_options& options, Symbol_table* symtab, | |
173 | Layout* layout, Target_x86_64* target, | |
174 | Sized_relobj<64, false>* object, | |
175 | unsigned int data_shndx, | |
07f397ab | 176 | Output_section* output_section, |
2e30d253 ILT |
177 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
178 | Symbol* gsym); | |
e041f13d | 179 | |
a036edd8 | 180 | private: |
e041f13d ILT |
181 | static void |
182 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
183 | ||
184 | static void | |
185 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
186 | Symbol*); | |
a036edd8 ILT |
187 | |
188 | void | |
189 | check_non_pic(Relobj*, unsigned int r_type); | |
190 | ||
191 | // Whether we have issued an error about a non-PIC compilation. | |
192 | bool issued_non_pic_error_; | |
2e30d253 ILT |
193 | }; |
194 | ||
195 | // The class which implements relocation. | |
196 | class Relocate | |
197 | { | |
198 | public: | |
199 | Relocate() | |
497897f9 | 200 | : skip_call_tls_get_addr_(false), saw_tls_block_reloc_(false) |
2e30d253 ILT |
201 | { } |
202 | ||
203 | ~Relocate() | |
204 | { | |
205 | if (this->skip_call_tls_get_addr_) | |
206 | { | |
207 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 208 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
209 | } |
210 | } | |
211 | ||
212 | // Do a relocation. Return false if the caller should not issue | |
213 | // any warnings about this relocation. | |
214 | inline bool | |
215 | relocate(const Relocate_info<64, false>*, Target_x86_64*, size_t relnum, | |
216 | const elfcpp::Rela<64, false>&, | |
217 | unsigned int r_type, const Sized_symbol<64>*, | |
218 | const Symbol_value<64>*, | |
219 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 220 | section_size_type); |
2e30d253 ILT |
221 | |
222 | private: | |
223 | // Do a TLS relocation. | |
224 | inline void | |
7bf1f802 ILT |
225 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
226 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
227 | unsigned int r_type, const Sized_symbol<64>*, |
228 | const Symbol_value<64>*, | |
fe8718a4 ILT |
229 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
230 | section_size_type); | |
2e30d253 | 231 | |
c2b45e22 | 232 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
233 | inline void |
234 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
235 | Output_segment* tls_segment, | |
236 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
237 | elfcpp::Elf_types<64>::Elf_Addr value, | |
238 | unsigned char* view, | |
c2b45e22 | 239 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 240 | section_size_type view_size); |
7bf1f802 | 241 | |
56622147 ILT |
242 | // Do a TLS General-Dynamic to Local-Exec transition. |
243 | inline void | |
244 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
245 | Output_segment* tls_segment, |
246 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
247 | elfcpp::Elf_types<64>::Elf_Addr value, | |
248 | unsigned char* view, | |
fe8718a4 | 249 | section_size_type view_size); |
2e30d253 | 250 | |
c2b45e22 CC |
251 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
252 | inline void | |
253 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
254 | Output_segment* tls_segment, | |
255 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
256 | elfcpp::Elf_types<64>::Elf_Addr value, | |
257 | unsigned char* view, | |
258 | elfcpp::Elf_types<64>::Elf_Addr, | |
259 | section_size_type view_size); | |
260 | ||
261 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
262 | inline void | |
263 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
264 | Output_segment* tls_segment, | |
265 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
266 | elfcpp::Elf_types<64>::Elf_Addr value, | |
267 | unsigned char* view, | |
268 | section_size_type view_size); | |
269 | ||
56622147 | 270 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 271 | inline void |
56622147 | 272 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
273 | Output_segment* tls_segment, |
274 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
275 | elfcpp::Elf_types<64>::Elf_Addr value, | |
276 | unsigned char* view, | |
fe8718a4 | 277 | section_size_type view_size); |
2e30d253 | 278 | |
56622147 ILT |
279 | // Do a TLS Initial-Exec to Local-Exec transition. |
280 | static inline void | |
281 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
282 | Output_segment* tls_segment, |
283 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
284 | elfcpp::Elf_types<64>::Elf_Addr value, | |
285 | unsigned char* view, | |
fe8718a4 | 286 | section_size_type view_size); |
2e30d253 ILT |
287 | |
288 | // This is set if we should skip the next reloc, which should be a | |
289 | // PLT32 reloc against ___tls_get_addr. | |
290 | bool skip_call_tls_get_addr_; | |
497897f9 ILT |
291 | |
292 | // This is set if we see a relocation which could load the address | |
293 | // of the TLS block. Whether we see such a relocation determines | |
294 | // how we handle the R_X86_64_DTPOFF32 relocation, which is used | |
295 | // in debugging sections. | |
296 | bool saw_tls_block_reloc_; | |
2e30d253 ILT |
297 | }; |
298 | ||
6a74a719 ILT |
299 | // A class which returns the size required for a relocation type, |
300 | // used while scanning relocs during a relocatable link. | |
301 | class Relocatable_size_for_reloc | |
302 | { | |
303 | public: | |
304 | unsigned int | |
305 | get_size_for_reloc(unsigned int, Relobj*); | |
306 | }; | |
307 | ||
2e30d253 ILT |
308 | // Adjust TLS relocation type based on the options and whether this |
309 | // is a local symbol. | |
e041f13d | 310 | static tls::Tls_optimization |
2e30d253 ILT |
311 | optimize_tls_reloc(bool is_final, int r_type); |
312 | ||
313 | // Get the GOT section, creating it if necessary. | |
314 | Output_data_got<64, false>* | |
315 | got_section(Symbol_table*, Layout*); | |
316 | ||
96f2030e ILT |
317 | // Get the GOT PLT section. |
318 | Output_data_space* | |
319 | got_plt_section() const | |
320 | { | |
321 | gold_assert(this->got_plt_ != NULL); | |
322 | return this->got_plt_; | |
323 | } | |
324 | ||
c2b45e22 CC |
325 | // Create the PLT section. |
326 | void | |
327 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
328 | ||
2e30d253 ILT |
329 | // Create a PLT entry for a global symbol. |
330 | void | |
331 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
332 | ||
9fa33bee | 333 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
334 | void |
335 | define_tls_base_symbol(Symbol_table*, Layout*); | |
336 | ||
c2b45e22 CC |
337 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
338 | void | |
339 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
340 | ||
31d60480 ILT |
341 | // Create a GOT entry for the TLS module index. |
342 | unsigned int | |
343 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
344 | Sized_relobj<64, false>* object); | |
345 | ||
2e30d253 ILT |
346 | // Get the PLT section. |
347 | Output_data_plt_x86_64* | |
348 | plt_section() const | |
349 | { | |
350 | gold_assert(this->plt_ != NULL); | |
351 | return this->plt_; | |
352 | } | |
353 | ||
354 | // Get the dynamic reloc section, creating it if necessary. | |
355 | Reloc_section* | |
0ffd9845 | 356 | rela_dyn_section(Layout*); |
2e30d253 | 357 | |
d61c6bd4 ILT |
358 | // Return true if the symbol may need a COPY relocation. |
359 | // References from an executable object to non-function symbols | |
360 | // defined in a dynamic object may need a COPY relocation. | |
361 | bool | |
362 | may_need_copy_reloc(Symbol* gsym) | |
363 | { | |
8851ecca | 364 | return (!parameters->options().shared() |
d61c6bd4 ILT |
365 | && gsym->is_from_dynobj() |
366 | && gsym->type() != elfcpp::STT_FUNC); | |
367 | } | |
368 | ||
12c0daef | 369 | // Add a potential copy relocation. |
2e30d253 | 370 | void |
ef9beddf ILT |
371 | copy_reloc(Symbol_table* symtab, Layout* layout, |
372 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
373 | unsigned int shndx, Output_section* output_section, |
374 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
375 | { | |
376 | this->copy_relocs_.copy_reloc(symtab, layout, | |
377 | symtab->get_sized_symbol<64>(sym), | |
378 | object, shndx, output_section, | |
379 | reloc, this->rela_dyn_section(layout)); | |
380 | } | |
2e30d253 ILT |
381 | |
382 | // Information about this specific target which we pass to the | |
383 | // general Target structure. | |
384 | static const Target::Target_info x86_64_info; | |
385 | ||
0a65a3a7 CC |
386 | enum Got_type |
387 | { | |
388 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
389 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
390 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
391 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
392 | }; | |
393 | ||
2e30d253 ILT |
394 | // The GOT section. |
395 | Output_data_got<64, false>* got_; | |
396 | // The PLT section. | |
397 | Output_data_plt_x86_64* plt_; | |
398 | // The GOT PLT section. | |
399 | Output_data_space* got_plt_; | |
400 | // The dynamic reloc section. | |
0ffd9845 | 401 | Reloc_section* rela_dyn_; |
2e30d253 | 402 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 403 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
404 | // Space for variables copied with a COPY reloc. |
405 | Output_data_space* dynbss_; | |
c2b45e22 | 406 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 407 | unsigned int got_mod_index_offset_; |
edfbb029 CC |
408 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
409 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
410 | }; |
411 | ||
412 | const Target::Target_info Target_x86_64::x86_64_info = | |
413 | { | |
414 | 64, // size | |
415 | false, // is_big_endian | |
416 | elfcpp::EM_X86_64, // machine_code | |
417 | false, // has_make_symbol | |
418 | false, // has_resolve | |
419 | true, // has_code_fill | |
35cdfc9a | 420 | true, // is_default_stack_executable |
0864d551 | 421 | '\0', // wrap_char |
2e30d253 | 422 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 423 | 0x400000, // default_text_segment_address |
cd72c291 ILT |
424 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
425 | 0x1000 // common_pagesize (overridable by -z common-page-size) | |
2e30d253 ILT |
426 | }; |
427 | ||
428 | // Get the GOT section, creating it if necessary. | |
429 | ||
430 | Output_data_got<64, false>* | |
431 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
432 | { | |
433 | if (this->got_ == NULL) | |
434 | { | |
435 | gold_assert(symtab != NULL && layout != NULL); | |
436 | ||
437 | this->got_ = new Output_data_got<64, false>(); | |
438 | ||
9f1d377b ILT |
439 | Output_section* os; |
440 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
441 | (elfcpp::SHF_ALLOC | |
442 | | elfcpp::SHF_WRITE), | |
443 | this->got_); | |
444 | os->set_is_relro(); | |
2e30d253 ILT |
445 | |
446 | // The old GNU linker creates a .got.plt section. We just | |
447 | // create another set of data in the .got section. Note that we | |
448 | // always create a PLT if we create a GOT, although the PLT | |
449 | // might be empty. | |
7d9e3d98 | 450 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
9f1d377b ILT |
451 | os = layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
452 | (elfcpp::SHF_ALLOC | |
453 | | elfcpp::SHF_WRITE), | |
454 | this->got_plt_); | |
455 | os->set_is_relro(); | |
2e30d253 ILT |
456 | |
457 | // The first three entries are reserved. | |
27bc2bce | 458 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 ILT |
459 | |
460 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
9b07f471 | 461 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, |
2e30d253 ILT |
462 | this->got_plt_, |
463 | 0, 0, elfcpp::STT_OBJECT, | |
464 | elfcpp::STB_LOCAL, | |
465 | elfcpp::STV_HIDDEN, 0, | |
466 | false, false); | |
467 | } | |
468 | ||
469 | return this->got_; | |
470 | } | |
471 | ||
472 | // Get the dynamic reloc section, creating it if necessary. | |
473 | ||
474 | Target_x86_64::Reloc_section* | |
0ffd9845 | 475 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 476 | { |
0ffd9845 | 477 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
478 | { |
479 | gold_assert(layout != NULL); | |
d98bc257 | 480 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 481 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
0ffd9845 | 482 | elfcpp::SHF_ALLOC, this->rela_dyn_); |
2e30d253 | 483 | } |
0ffd9845 | 484 | return this->rela_dyn_; |
2e30d253 ILT |
485 | } |
486 | ||
487 | // A class to handle the PLT data. | |
488 | ||
489 | class Output_data_plt_x86_64 : public Output_section_data | |
490 | { | |
491 | public: | |
492 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
493 | ||
c2b45e22 CC |
494 | Output_data_plt_x86_64(Layout*, Output_data_got<64, false>*, |
495 | Output_data_space*); | |
2e30d253 ILT |
496 | |
497 | // Add an entry to the PLT. | |
498 | void | |
499 | add_entry(Symbol* gsym); | |
500 | ||
c2b45e22 CC |
501 | // Add the reserved TLSDESC_PLT entry to the PLT. |
502 | void | |
503 | reserve_tlsdesc_entry(unsigned int got_offset) | |
504 | { this->tlsdesc_got_offset_ = got_offset; } | |
505 | ||
506 | // Return true if a TLSDESC_PLT entry has been reserved. | |
507 | bool | |
508 | has_tlsdesc_entry() const | |
509 | { return this->tlsdesc_got_offset_ != -1U; } | |
510 | ||
511 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
512 | unsigned int | |
513 | get_tlsdesc_got_offset() const | |
514 | { return this->tlsdesc_got_offset_; } | |
515 | ||
516 | // Return the offset of the reserved TLSDESC_PLT entry. | |
517 | unsigned int | |
518 | get_tlsdesc_plt_offset() const | |
519 | { return (this->count_ + 1) * plt_entry_size; } | |
520 | ||
2e30d253 ILT |
521 | // Return the .rel.plt section data. |
522 | const Reloc_section* | |
523 | rel_plt() const | |
524 | { return this->rel_; } | |
525 | ||
526 | protected: | |
527 | void | |
528 | do_adjust_output_section(Output_section* os); | |
529 | ||
7d9e3d98 ILT |
530 | // Write to a map file. |
531 | void | |
532 | do_print_to_mapfile(Mapfile* mapfile) const | |
533 | { mapfile->print_output_data(this, _("** PLT")); } | |
534 | ||
2e30d253 ILT |
535 | private: |
536 | // The size of an entry in the PLT. | |
537 | static const int plt_entry_size = 16; | |
538 | ||
539 | // The first entry in the PLT. | |
540 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
541 | // procedure linkage table for both programs and shared objects." | |
542 | static unsigned char first_plt_entry[plt_entry_size]; | |
543 | ||
544 | // Other entries in the PLT for an executable. | |
545 | static unsigned char plt_entry[plt_entry_size]; | |
546 | ||
c2b45e22 CC |
547 | // The reserved TLSDESC entry in the PLT for an executable. |
548 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
549 | ||
2e30d253 ILT |
550 | // Set the final size. |
551 | void | |
c2b45e22 | 552 | set_final_data_size(); |
2e30d253 ILT |
553 | |
554 | // Write out the PLT data. | |
555 | void | |
556 | do_write(Output_file*); | |
557 | ||
558 | // The reloc section. | |
559 | Reloc_section* rel_; | |
c2b45e22 CC |
560 | // The .got section. |
561 | Output_data_got<64, false>* got_; | |
2e30d253 ILT |
562 | // The .got.plt section. |
563 | Output_data_space* got_plt_; | |
564 | // The number of PLT entries. | |
565 | unsigned int count_; | |
c2b45e22 CC |
566 | // Offset of the reserved TLSDESC_GOT entry when needed. |
567 | unsigned int tlsdesc_got_offset_; | |
2e30d253 ILT |
568 | }; |
569 | ||
570 | // Create the PLT section. The ordinary .got section is an argument, | |
571 | // since we need to refer to the start. We also create our own .got | |
572 | // section just for PLT entries. | |
573 | ||
574 | Output_data_plt_x86_64::Output_data_plt_x86_64(Layout* layout, | |
c2b45e22 | 575 | Output_data_got<64, false>* got, |
2e30d253 | 576 | Output_data_space* got_plt) |
c2b45e22 CC |
577 | : Output_section_data(8), got_(got), got_plt_(got_plt), count_(0), |
578 | tlsdesc_got_offset_(-1U) | |
2e30d253 | 579 | { |
d98bc257 | 580 | this->rel_ = new Reloc_section(false); |
2e30d253 ILT |
581 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
582 | elfcpp::SHF_ALLOC, this->rel_); | |
583 | } | |
584 | ||
585 | void | |
586 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
587 | { | |
588 | // UnixWare sets the entsize of .plt to 4, and so does the old GNU | |
589 | // linker, and so do we. | |
590 | os->set_entsize(4); | |
591 | } | |
592 | ||
593 | // Add an entry to the PLT. | |
594 | ||
595 | void | |
596 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
597 | { | |
598 | gold_assert(!gsym->has_plt_offset()); | |
599 | ||
600 | // Note that when setting the PLT offset we skip the initial | |
601 | // reserved PLT entry. | |
602 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
603 | ||
604 | ++this->count_; | |
605 | ||
fe8718a4 | 606 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
607 | |
608 | // Every PLT entry needs a GOT entry which points back to the PLT | |
609 | // entry (this will be changed by the dynamic linker, normally | |
610 | // lazily when the function is called). | |
27bc2bce | 611 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
612 | |
613 | // Every PLT entry needs a reloc. | |
614 | gsym->set_needs_dynsym_entry(); | |
615 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
616 | got_offset, 0); | |
617 | ||
618 | // Note that we don't need to save the symbol. The contents of the | |
619 | // PLT are independent of which symbols are used. The symbols only | |
620 | // appear in the relocations. | |
621 | } | |
622 | ||
c2b45e22 CC |
623 | // Set the final size. |
624 | void | |
625 | Output_data_plt_x86_64::set_final_data_size() | |
626 | { | |
627 | unsigned int count = this->count_; | |
628 | if (this->has_tlsdesc_entry()) | |
629 | ++count; | |
630 | this->set_data_size((count + 1) * plt_entry_size); | |
631 | } | |
632 | ||
2e30d253 ILT |
633 | // The first entry in the PLT for an executable. |
634 | ||
635 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
636 | { | |
637 | // From AMD64 ABI Draft 0.98, page 76 | |
638 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 639 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
640 | 0xff, 0x25, // jmp indirect |
641 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
642 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
643 | }; | |
644 | ||
645 | // Subsequent entries in the PLT for an executable. | |
646 | ||
647 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
648 | { | |
649 | // From AMD64 ABI Draft 0.98, page 76 | |
650 | 0xff, 0x25, // jmpq indirect | |
651 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
652 | 0x68, // pushq immediate | |
653 | 0, 0, 0, 0, // replaced with offset into relocation table | |
654 | 0xe9, // jmpq relative | |
655 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
656 | }; | |
657 | ||
c2b45e22 CC |
658 | // The reserved TLSDESC entry in the PLT for an executable. |
659 | ||
660 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
661 | { | |
662 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
663 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
664 | 0xff, 0x35, // pushq x(%rip) | |
665 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
666 | 0xff, 0x25, // jmpq *y(%rip) | |
667 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
668 | 0x0f, 0x1f, // nop | |
669 | 0x40, 0 | |
670 | }; | |
671 | ||
2e30d253 ILT |
672 | // Write out the PLT. This uses the hand-coded instructions above, |
673 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
674 | ||
675 | void | |
676 | Output_data_plt_x86_64::do_write(Output_file* of) | |
677 | { | |
678 | const off_t offset = this->offset(); | |
fe8718a4 ILT |
679 | const section_size_type oview_size = |
680 | convert_to_section_size_type(this->data_size()); | |
2e30d253 ILT |
681 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
682 | ||
683 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
684 | const section_size_type got_size = |
685 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
686 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
687 | got_size); | |
688 | ||
689 | unsigned char* pov = oview; | |
690 | ||
c2b45e22 | 691 | // The base address of the .plt section. |
a984ee1d | 692 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 693 | // The base address of the .got section. |
a984ee1d | 694 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
695 | // The base address of the PLT portion of the .got section, |
696 | // which is where the GOT pointer will point, and where the | |
697 | // three reserved GOT entries are located. | |
a984ee1d | 698 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
699 | |
700 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 701 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
702 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
703 | (got_address + 8 | |
704 | - (plt_address + 6))); | |
705 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
706 | (got_address + 16 | |
707 | - (plt_address + 12))); | |
2e30d253 ILT |
708 | pov += plt_entry_size; |
709 | ||
710 | unsigned char* got_pov = got_view; | |
711 | ||
712 | memset(got_pov, 0, 24); | |
713 | got_pov += 24; | |
714 | ||
715 | unsigned int plt_offset = plt_entry_size; | |
716 | unsigned int got_offset = 24; | |
717 | const unsigned int count = this->count_; | |
718 | for (unsigned int plt_index = 0; | |
719 | plt_index < count; | |
720 | ++plt_index, | |
721 | pov += plt_entry_size, | |
722 | got_pov += 8, | |
723 | plt_offset += plt_entry_size, | |
724 | got_offset += 8) | |
725 | { | |
726 | // Set and adjust the PLT entry itself. | |
727 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
728 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
729 | (got_address + got_offset | |
730 | - (plt_address + plt_offset | |
731 | + 6))); | |
2e30d253 ILT |
732 | |
733 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
734 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
735 | - (plt_offset + plt_entry_size)); | |
736 | ||
737 | // Set the entry in the GOT. | |
738 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
739 | } | |
740 | ||
c2b45e22 CC |
741 | if (this->has_tlsdesc_entry()) |
742 | { | |
743 | // Set and adjust the reserved TLSDESC PLT entry. | |
744 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
745 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
746 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
747 | (got_address + 8 | |
748 | - (plt_address + plt_offset | |
749 | + 6))); | |
750 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
751 | (got_base | |
752 | + tlsdesc_got_offset | |
753 | - (plt_address + plt_offset | |
754 | + 12))); | |
755 | pov += plt_entry_size; | |
756 | } | |
757 | ||
fe8718a4 ILT |
758 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
759 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 ILT |
760 | |
761 | of->write_output_view(offset, oview_size, oview); | |
762 | of->write_output_view(got_file_offset, got_size, got_view); | |
763 | } | |
764 | ||
c2b45e22 | 765 | // Create the PLT section. |
2e30d253 ILT |
766 | |
767 | void | |
c2b45e22 | 768 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 769 | { |
2e30d253 ILT |
770 | if (this->plt_ == NULL) |
771 | { | |
772 | // Create the GOT sections first. | |
773 | this->got_section(symtab, layout); | |
774 | ||
c2b45e22 CC |
775 | this->plt_ = new Output_data_plt_x86_64(layout, this->got_, |
776 | this->got_plt_); | |
2e30d253 ILT |
777 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
778 | (elfcpp::SHF_ALLOC | |
779 | | elfcpp::SHF_EXECINSTR), | |
780 | this->plt_); | |
781 | } | |
c2b45e22 CC |
782 | } |
783 | ||
784 | // Create a PLT entry for a global symbol. | |
785 | ||
786 | void | |
787 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
788 | Symbol* gsym) | |
789 | { | |
790 | if (gsym->has_plt_offset()) | |
791 | return; | |
792 | ||
793 | if (this->plt_ == NULL) | |
794 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
795 | |
796 | this->plt_->add_entry(gsym); | |
797 | } | |
798 | ||
9fa33bee | 799 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
800 | |
801 | void | |
802 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
803 | { | |
804 | if (this->tls_base_symbol_defined_) | |
805 | return; | |
806 | ||
807 | Output_segment* tls_segment = layout->tls_segment(); | |
808 | if (tls_segment != NULL) | |
809 | { | |
183fd0e3 | 810 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 CC |
811 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
812 | tls_segment, 0, 0, | |
813 | elfcpp::STT_TLS, | |
814 | elfcpp::STB_LOCAL, | |
815 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
816 | (is_exec |
817 | ? Symbol::SEGMENT_END | |
818 | : Symbol::SEGMENT_START), | |
819 | true); | |
edfbb029 CC |
820 | } |
821 | this->tls_base_symbol_defined_ = true; | |
822 | } | |
823 | ||
c2b45e22 CC |
824 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
825 | ||
826 | void | |
827 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
828 | Layout* layout) | |
829 | { | |
830 | if (this->plt_ == NULL) | |
831 | this->make_plt_section(symtab, layout); | |
832 | ||
833 | if (!this->plt_->has_tlsdesc_entry()) | |
834 | { | |
835 | // Allocate the TLSDESC_GOT entry. | |
836 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
837 | unsigned int got_offset = got->add_constant(0); | |
838 | ||
839 | // Allocate the TLSDESC_PLT entry. | |
840 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
841 | } | |
842 | } | |
843 | ||
31d60480 ILT |
844 | // Create a GOT entry for the TLS module index. |
845 | ||
846 | unsigned int | |
847 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
848 | Sized_relobj<64, false>* object) | |
849 | { | |
850 | if (this->got_mod_index_offset_ == -1U) | |
851 | { | |
852 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
853 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
854 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
855 | unsigned int got_offset = got->add_constant(0); | |
856 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
857 | got_offset, 0); | |
009a67a2 | 858 | got->add_constant(0); |
31d60480 ILT |
859 | this->got_mod_index_offset_ = got_offset; |
860 | } | |
861 | return this->got_mod_index_offset_; | |
862 | } | |
863 | ||
2e30d253 ILT |
864 | // Optimize the TLS relocation type based on what we know about the |
865 | // symbol. IS_FINAL is true if the final address of this symbol is | |
866 | // known at link time. | |
867 | ||
e041f13d | 868 | tls::Tls_optimization |
2e30d253 ILT |
869 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
870 | { | |
2e30d253 ILT |
871 | // If we are generating a shared library, then we can't do anything |
872 | // in the linker. | |
8851ecca | 873 | if (parameters->options().shared()) |
e041f13d | 874 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
875 | |
876 | switch (r_type) | |
877 | { | |
878 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
879 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
880 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
881 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
882 | // access. Since we know that we are generating an executable, |
883 | // we can convert this to Initial-Exec. If we also know that | |
884 | // this is a local symbol, we can further switch to Local-Exec. | |
885 | if (is_final) | |
e041f13d ILT |
886 | return tls::TLSOPT_TO_LE; |
887 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 888 | |
d61c17ea | 889 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
890 | // This is Local-Dynamic, which refers to a local symbol in the |
891 | // dynamic TLS block. Since we know that we generating an | |
892 | // executable, we can switch to Local-Exec. | |
e041f13d | 893 | return tls::TLSOPT_TO_LE; |
2e30d253 | 894 | |
0ffd9845 | 895 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
896 | case elfcpp::R_X86_64_DTPOFF64: |
897 | // Another Local-Dynamic reloc. | |
e041f13d | 898 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 899 | |
d61c17ea | 900 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
901 | // These are Initial-Exec relocs which get the thread offset |
902 | // from the GOT. If we know that we are linking against the | |
903 | // local symbol, we can switch to Local-Exec, which links the | |
904 | // thread offset into the instruction. | |
905 | if (is_final) | |
e041f13d ILT |
906 | return tls::TLSOPT_TO_LE; |
907 | return tls::TLSOPT_NONE; | |
2e30d253 | 908 | |
d61c17ea | 909 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
910 | // When we already have Local-Exec, there is nothing further we |
911 | // can do. | |
e041f13d | 912 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
913 | |
914 | default: | |
915 | gold_unreachable(); | |
916 | } | |
2e30d253 ILT |
917 | } |
918 | ||
e041f13d ILT |
919 | // Report an unsupported relocation against a local symbol. |
920 | ||
921 | void | |
922 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
923 | unsigned int r_type) | |
924 | { | |
75f2446e ILT |
925 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
926 | object->name().c_str(), r_type); | |
e041f13d ILT |
927 | } |
928 | ||
a036edd8 ILT |
929 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
930 | // dynamic linker does not support it, issue an error. The GNU linker | |
931 | // only issues a non-PIC error for an allocated read-only section. | |
932 | // Here we know the section is allocated, but we don't know that it is | |
933 | // read-only. But we check for all the relocation types which the | |
934 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
935 | // error even if the section is not read-only. | |
936 | ||
937 | void | |
938 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
939 | { | |
940 | switch (r_type) | |
941 | { | |
942 | // These are the relocation types supported by glibc for x86_64. | |
943 | case elfcpp::R_X86_64_RELATIVE: | |
944 | case elfcpp::R_X86_64_GLOB_DAT: | |
945 | case elfcpp::R_X86_64_JUMP_SLOT: | |
946 | case elfcpp::R_X86_64_DTPMOD64: | |
947 | case elfcpp::R_X86_64_DTPOFF64: | |
948 | case elfcpp::R_X86_64_TPOFF64: | |
949 | case elfcpp::R_X86_64_64: | |
950 | case elfcpp::R_X86_64_32: | |
951 | case elfcpp::R_X86_64_PC32: | |
952 | case elfcpp::R_X86_64_COPY: | |
953 | return; | |
954 | ||
955 | default: | |
956 | // This prevents us from issuing more than one error per reloc | |
957 | // section. But we can still wind up issuing more than one | |
958 | // error per object file. | |
959 | if (this->issued_non_pic_error_) | |
960 | return; | |
961 | object->error(_("requires unsupported dynamic reloc; " | |
962 | "recompile with -fPIC")); | |
963 | this->issued_non_pic_error_ = true; | |
964 | return; | |
965 | ||
966 | case elfcpp::R_X86_64_NONE: | |
967 | gold_unreachable(); | |
968 | } | |
969 | } | |
970 | ||
2e30d253 ILT |
971 | // Scan a relocation for a local symbol. |
972 | ||
973 | inline void | |
974 | Target_x86_64::Scan::local(const General_options&, | |
d61c17ea ILT |
975 | Symbol_table* symtab, |
976 | Layout* layout, | |
977 | Target_x86_64* target, | |
978 | Sized_relobj<64, false>* object, | |
0ffd9845 | 979 | unsigned int data_shndx, |
4f4c5f80 | 980 | Output_section* output_section, |
0ffd9845 | 981 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 982 | unsigned int r_type, |
7bf1f802 | 983 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 ILT |
984 | { |
985 | switch (r_type) | |
986 | { | |
987 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
988 | case elfcpp::R_386_GNU_VTINHERIT: |
989 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
990 | break; |
991 | ||
992 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 993 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
994 | // executable), we need to create a dynamic relocation for this |
995 | // location. The relocation applied at link time will apply the | |
996 | // link-time value, so we flag the location with an | |
997 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 998 | // relocate it easily. |
8851ecca | 999 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1000 | { |
e8c846c3 | 1001 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1002 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
e8c846c3 ILT |
1003 | rela_dyn->add_local_relative(object, r_sym, |
1004 | elfcpp::R_X86_64_RELATIVE, | |
1005 | output_section, data_shndx, | |
1006 | reloc.get_r_offset(), | |
1007 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1008 | } |
1009 | break; | |
1010 | ||
2e30d253 ILT |
1011 | case elfcpp::R_X86_64_32: |
1012 | case elfcpp::R_X86_64_32S: | |
1013 | case elfcpp::R_X86_64_16: | |
1014 | case elfcpp::R_X86_64_8: | |
96f2030e | 1015 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1016 | // executable), we need to create a dynamic relocation for this |
1017 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1018 | // because that is always a 64-bit relocation. | |
8851ecca | 1019 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1020 | { |
a036edd8 ILT |
1021 | this->check_non_pic(object, r_type); |
1022 | ||
96f2030e | 1023 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1024 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1025 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1026 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1027 | data_shndx, reloc.get_r_offset(), | |
1028 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1029 | else |
1030 | { | |
1031 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1032 | unsigned int shndx = lsym.get_st_shndx(); |
1033 | bool is_ordinary; | |
1034 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1035 | &is_ordinary); | |
1036 | if (!is_ordinary) | |
1037 | object->error(_("section symbol %u has bad shndx %u"), | |
1038 | r_sym, shndx); | |
1039 | else | |
1040 | rela_dyn->add_local_section(object, shndx, | |
1041 | r_type, output_section, | |
1042 | data_shndx, reloc.get_r_offset(), | |
1043 | reloc.get_r_addend()); | |
dceae3c1 | 1044 | } |
96f2030e | 1045 | } |
2e30d253 ILT |
1046 | break; |
1047 | ||
1048 | case elfcpp::R_X86_64_PC64: | |
1049 | case elfcpp::R_X86_64_PC32: | |
1050 | case elfcpp::R_X86_64_PC16: | |
1051 | case elfcpp::R_X86_64_PC8: | |
1052 | break; | |
1053 | ||
f389a824 ILT |
1054 | case elfcpp::R_X86_64_PLT32: |
1055 | // Since we know this is a local symbol, we can handle this as a | |
1056 | // PC32 reloc. | |
1057 | break; | |
1058 | ||
fdc2f80f | 1059 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1060 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1061 | case elfcpp::R_X86_64_GOTPC64: |
1062 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1063 | // We need a GOT section. |
1064 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1065 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1066 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1067 | break; |
1068 | ||
0ffd9845 ILT |
1069 | case elfcpp::R_X86_64_GOT64: |
1070 | case elfcpp::R_X86_64_GOT32: | |
1071 | case elfcpp::R_X86_64_GOTPCREL64: | |
1072 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1073 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1074 | { |
1075 | // The symbol requires a GOT entry. | |
1076 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1077 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1078 | if (got->add_local(object, r_sym, GOT_TYPE_STANDARD)) |
0ffd9845 ILT |
1079 | { |
1080 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1081 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1082 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1083 | { |
1084 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1085 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1086 | if (r_type != elfcpp::R_X86_64_GOT32) | |
0a65a3a7 CC |
1087 | rela_dyn->add_local_relative( |
1088 | object, r_sym, elfcpp::R_X86_64_RELATIVE, got, | |
1089 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
7bf1f802 | 1090 | else |
dceae3c1 | 1091 | { |
a036edd8 ILT |
1092 | this->check_non_pic(object, r_type); |
1093 | ||
dceae3c1 | 1094 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1095 | rela_dyn->add_local( |
1096 | object, r_sym, r_type, got, | |
1097 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1098 | } |
0ffd9845 ILT |
1099 | } |
1100 | } | |
ee9e9e86 ILT |
1101 | // For GOTPLT64, we'd normally want a PLT section, but since |
1102 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1103 | } |
1104 | break; | |
1105 | ||
2e30d253 ILT |
1106 | case elfcpp::R_X86_64_COPY: |
1107 | case elfcpp::R_X86_64_GLOB_DAT: | |
1108 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1109 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1110 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1111 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1112 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1113 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1114 | gold_error(_("%s: unexpected reloc %u in object file"), |
1115 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1116 | break; |
1117 | ||
d61c17ea | 1118 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1119 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1120 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1121 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1122 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1123 | case elfcpp::R_X86_64_DTPOFF32: |
1124 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1125 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1126 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1127 | { |
8851ecca | 1128 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1129 | const tls::Tls_optimization optimized_type |
1130 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1131 | switch (r_type) |
1132 | { | |
56622147 | 1133 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1134 | if (optimized_type == tls::TLSOPT_NONE) |
1135 | { | |
1136 | // Create a pair of GOT entries for the module index and | |
1137 | // dtv-relative offset. | |
1138 | Output_data_got<64, false>* got | |
1139 | = target->got_section(symtab, layout); | |
1140 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1141 | unsigned int shndx = lsym.get_st_shndx(); |
1142 | bool is_ordinary; | |
1143 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1144 | if (!is_ordinary) | |
1145 | object->error(_("local symbol %u has bad shndx %u"), | |
1146 | r_sym, shndx); | |
1147 | else | |
1148 | got->add_local_pair_with_rela(object, r_sym, | |
1149 | shndx, | |
1150 | GOT_TYPE_TLS_PAIR, | |
1151 | target->rela_dyn_section(layout), | |
1152 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1153 | } |
1154 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1155 | unsupported_reloc_local(object, r_type); | |
1156 | break; | |
1157 | ||
56622147 | 1158 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1159 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1160 | if (optimized_type == tls::TLSOPT_NONE) |
1161 | { | |
1162 | // Create reserved PLT and GOT entries for the resolver. | |
1163 | target->reserve_tlsdesc_entries(symtab, layout); | |
1164 | ||
1165 | // Generate a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1166 | Output_data_got<64, false>* got | |
1167 | = target->got_section(symtab, layout); | |
1168 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1169 | unsigned int shndx = lsym.get_st_shndx(); |
1170 | bool is_ordinary; | |
1171 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1172 | if (!is_ordinary) | |
1173 | object->error(_("local symbol %u has bad shndx %u"), | |
1174 | r_sym, shndx); | |
1175 | else | |
1176 | got->add_local_pair_with_rela(object, r_sym, | |
1177 | shndx, | |
1178 | GOT_TYPE_TLS_DESC, | |
1179 | target->rela_dyn_section(layout), | |
1180 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
1181 | } |
1182 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1183 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1184 | break; |
1185 | ||
c2b45e22 CC |
1186 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1187 | break; | |
1188 | ||
e041f13d | 1189 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1190 | if (optimized_type == tls::TLSOPT_NONE) |
1191 | { | |
1192 | // Create a GOT entry for the module index. | |
31d60480 | 1193 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1194 | } |
1195 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1196 | unsupported_reloc_local(object, r_type); | |
1197 | break; | |
1198 | ||
0ffd9845 ILT |
1199 | case elfcpp::R_X86_64_DTPOFF32: |
1200 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1201 | break; |
1202 | ||
56622147 | 1203 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1204 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1205 | if (optimized_type == tls::TLSOPT_NONE) |
1206 | { | |
1207 | // Create a GOT entry for the tp-relative offset. | |
1208 | Output_data_got<64, false>* got | |
1209 | = target->got_section(symtab, layout); | |
1210 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1211 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1212 | target->rela_dyn_section(layout), |
1213 | elfcpp::R_X86_64_TPOFF64); | |
1214 | } | |
1215 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1216 | unsupported_reloc_local(object, r_type); |
1217 | break; | |
0ffd9845 | 1218 | |
56622147 | 1219 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1220 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1221 | if (output_is_shared) |
1222 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1223 | break; |
e041f13d ILT |
1224 | |
1225 | default: | |
1226 | gold_unreachable(); | |
2e30d253 ILT |
1227 | } |
1228 | } | |
1229 | break; | |
2e30d253 | 1230 | |
fdc2f80f ILT |
1231 | case elfcpp::R_X86_64_SIZE32: |
1232 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1233 | default: |
75f2446e ILT |
1234 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1235 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1236 | break; |
1237 | } | |
1238 | } | |
1239 | ||
1240 | ||
e041f13d ILT |
1241 | // Report an unsupported relocation against a global symbol. |
1242 | ||
1243 | void | |
1244 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1245 | unsigned int r_type, | |
1246 | Symbol* gsym) | |
1247 | { | |
75f2446e | 1248 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1249 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1250 | } |
1251 | ||
2e30d253 ILT |
1252 | // Scan a relocation for a global symbol. |
1253 | ||
1254 | inline void | |
12c0daef | 1255 | Target_x86_64::Scan::global(const General_options&, |
d61c17ea ILT |
1256 | Symbol_table* symtab, |
1257 | Layout* layout, | |
1258 | Target_x86_64* target, | |
1259 | Sized_relobj<64, false>* object, | |
1260 | unsigned int data_shndx, | |
4f4c5f80 | 1261 | Output_section* output_section, |
d61c17ea ILT |
1262 | const elfcpp::Rela<64, false>& reloc, |
1263 | unsigned int r_type, | |
1264 | Symbol* gsym) | |
2e30d253 ILT |
1265 | { |
1266 | switch (r_type) | |
1267 | { | |
1268 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1269 | case elfcpp::R_386_GNU_VTINHERIT: |
1270 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1271 | break; |
1272 | ||
1273 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1274 | case elfcpp::R_X86_64_32: |
1275 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1276 | case elfcpp::R_X86_64_16: |
2e30d253 | 1277 | case elfcpp::R_X86_64_8: |
96f2030e | 1278 | { |
d61c6bd4 ILT |
1279 | // Make a PLT entry if necessary. |
1280 | if (gsym->needs_plt_entry()) | |
1281 | { | |
1282 | target->make_plt_entry(symtab, layout, gsym); | |
1283 | // Since this is not a PC-relative relocation, we may be | |
1284 | // taking the address of a function. In that case we need to | |
1285 | // set the entry in the dynamic symbol table to the address of | |
1286 | // the PLT entry. | |
8851ecca | 1287 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1288 | gsym->set_needs_dynsym_value(); |
1289 | } | |
1290 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1291 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 ILT |
1292 | { |
1293 | if (target->may_need_copy_reloc(gsym)) | |
1294 | { | |
12c0daef | 1295 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1296 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 ILT |
1297 | } |
1298 | else if (r_type == elfcpp::R_X86_64_64 | |
1299 | && gsym->can_use_relative_reloc(false)) | |
1300 | { | |
1301 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
e8c846c3 ILT |
1302 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1303 | output_section, object, | |
1304 | data_shndx, reloc.get_r_offset(), | |
1305 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1306 | } |
1307 | else | |
1308 | { | |
a036edd8 | 1309 | this->check_non_pic(object, r_type); |
96f2030e | 1310 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1311 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1312 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1313 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1314 | } |
1315 | } | |
1316 | } | |
1317 | break; | |
1318 | ||
1319 | case elfcpp::R_X86_64_PC64: | |
1320 | case elfcpp::R_X86_64_PC32: | |
1321 | case elfcpp::R_X86_64_PC16: | |
1322 | case elfcpp::R_X86_64_PC8: | |
1323 | { | |
1324 | // Make a PLT entry if necessary. | |
1325 | if (gsym->needs_plt_entry()) | |
1326 | target->make_plt_entry(symtab, layout, gsym); | |
1327 | // Make a dynamic relocation if necessary. | |
0700cf32 ILT |
1328 | int flags = Symbol::NON_PIC_REF; |
1329 | if (gsym->type() == elfcpp::STT_FUNC) | |
1330 | flags |= Symbol::FUNCTION_CALL; | |
1331 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1332 | { |
d61c6bd4 ILT |
1333 | if (target->may_need_copy_reloc(gsym)) |
1334 | { | |
12c0daef | 1335 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1336 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1337 | } |
86849f1f | 1338 | else |
d61c6bd4 | 1339 | { |
a036edd8 | 1340 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1341 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1342 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1343 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1344 | reloc.get_r_addend()); |
1345 | } | |
86849f1f | 1346 | } |
d61c6bd4 | 1347 | } |
2e30d253 ILT |
1348 | break; |
1349 | ||
ff006520 | 1350 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1351 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1352 | case elfcpp::R_X86_64_GOTPCREL64: |
1353 | case elfcpp::R_X86_64_GOTPCREL: | |
1354 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1355 | { |
1356 | // The symbol requires a GOT entry. | |
1357 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1358 | if (gsym->final_value_is_known()) |
0a65a3a7 | 1359 | got->add_global(gsym, GOT_TYPE_STANDARD); |
7bf1f802 ILT |
1360 | else |
1361 | { | |
2e30d253 ILT |
1362 | // If this symbol is not fully resolved, we need to add a |
1363 | // dynamic relocation for it. | |
7bf1f802 | 1364 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
8fc19601 ILT |
1365 | if (gsym->is_from_dynobj() |
1366 | || gsym->is_undefined() | |
1367 | || gsym->is_preemptible()) | |
0a65a3a7 | 1368 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1369 | elfcpp::R_X86_64_GLOB_DAT); |
1370 | else | |
2e30d253 | 1371 | { |
0a65a3a7 CC |
1372 | if (got->add_global(gsym, GOT_TYPE_STANDARD)) |
1373 | rela_dyn->add_global_relative( | |
1374 | gsym, elfcpp::R_X86_64_RELATIVE, got, | |
1375 | gsym->got_offset(GOT_TYPE_STANDARD), 0); | |
2e30d253 ILT |
1376 | } |
1377 | } | |
ee9e9e86 ILT |
1378 | // For GOTPLT64, we also need a PLT entry (but only if the |
1379 | // symbol is not fully resolved). | |
1380 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1381 | && !gsym->final_value_is_known()) | |
1382 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1383 | } |
1384 | break; | |
1385 | ||
1386 | case elfcpp::R_X86_64_PLT32: | |
1387 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1388 | // Otherwise we need a PLT entry. | |
1389 | if (gsym->final_value_is_known()) | |
1390 | break; | |
96f2030e ILT |
1391 | // If building a shared library, we can also skip the PLT entry |
1392 | // if the symbol is defined in the output file and is protected | |
1393 | // or hidden. | |
1394 | if (gsym->is_defined() | |
1395 | && !gsym->is_from_dynobj() | |
1396 | && !gsym->is_preemptible()) | |
1397 | break; | |
2e30d253 ILT |
1398 | target->make_plt_entry(symtab, layout, gsym); |
1399 | break; | |
1400 | ||
fdc2f80f | 1401 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1402 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1403 | case elfcpp::R_X86_64_GOTPC64: |
1404 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1405 | // We need a GOT section. |
1406 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1407 | // For PLTOFF64, we also need a PLT entry (but only if the |
1408 | // symbol is not fully resolved). | |
1409 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1410 | && !gsym->final_value_is_known()) | |
1411 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1412 | break; |
1413 | ||
2e30d253 ILT |
1414 | case elfcpp::R_X86_64_COPY: |
1415 | case elfcpp::R_X86_64_GLOB_DAT: | |
1416 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1417 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1418 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1419 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1420 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1421 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1422 | gold_error(_("%s: unexpected reloc %u in object file"), |
1423 | object->name().c_str(), r_type); | |
2e30d253 | 1424 | break; |
2e30d253 | 1425 | |
d61c17ea | 1426 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1427 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1428 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1429 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1430 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1431 | case elfcpp::R_X86_64_DTPOFF32: |
1432 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1433 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1434 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1435 | { |
1436 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1437 | const tls::Tls_optimization optimized_type |
1438 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1439 | switch (r_type) |
1440 | { | |
56622147 | 1441 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1442 | if (optimized_type == tls::TLSOPT_NONE) |
1443 | { | |
1444 | // Create a pair of GOT entries for the module index and | |
1445 | // dtv-relative offset. | |
1446 | Output_data_got<64, false>* got | |
1447 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1448 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1449 | target->rela_dyn_section(layout), | |
1450 | elfcpp::R_X86_64_DTPMOD64, | |
1451 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1452 | } |
1453 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1454 | { | |
1455 | // Create a GOT entry for the tp-relative offset. | |
1456 | Output_data_got<64, false>* got | |
1457 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1458 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1459 | target->rela_dyn_section(layout), |
1460 | elfcpp::R_X86_64_TPOFF64); | |
1461 | } | |
1462 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1463 | unsupported_reloc_global(object, r_type, gsym); | |
1464 | break; | |
1465 | ||
56622147 | 1466 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1467 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1468 | if (optimized_type == tls::TLSOPT_NONE) |
1469 | { | |
1470 | // Create reserved PLT and GOT entries for the resolver. | |
1471 | target->reserve_tlsdesc_entries(symtab, layout); | |
1472 | ||
1473 | // Create a double GOT entry with an R_X86_64_TLSDESC reloc. | |
1474 | Output_data_got<64, false>* got | |
1475 | = target->got_section(symtab, layout); | |
1476 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, | |
1477 | target->rela_dyn_section(layout), | |
1478 | elfcpp::R_X86_64_TLSDESC, 0); | |
1479 | } | |
1480 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1481 | { | |
1482 | // Create a GOT entry for the tp-relative offset. | |
1483 | Output_data_got<64, false>* got | |
1484 | = target->got_section(symtab, layout); | |
1485 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
1486 | target->rela_dyn_section(layout), | |
1487 | elfcpp::R_X86_64_TPOFF64); | |
1488 | } | |
1489 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1490 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
1491 | break; |
1492 | ||
c2b45e22 CC |
1493 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1494 | break; | |
1495 | ||
e041f13d | 1496 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1497 | if (optimized_type == tls::TLSOPT_NONE) |
1498 | { | |
1499 | // Create a GOT entry for the module index. | |
31d60480 | 1500 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1501 | } |
1502 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1503 | unsupported_reloc_global(object, r_type, gsym); | |
1504 | break; | |
1505 | ||
0ffd9845 ILT |
1506 | case elfcpp::R_X86_64_DTPOFF32: |
1507 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1508 | break; |
1509 | ||
56622147 | 1510 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1511 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1512 | if (optimized_type == tls::TLSOPT_NONE) |
1513 | { | |
1514 | // Create a GOT entry for the tp-relative offset. | |
1515 | Output_data_got<64, false>* got | |
1516 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1517 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1518 | target->rela_dyn_section(layout), |
1519 | elfcpp::R_X86_64_TPOFF64); | |
1520 | } | |
1521 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1522 | unsupported_reloc_global(object, r_type, gsym); |
1523 | break; | |
0ffd9845 | 1524 | |
56622147 | 1525 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1526 | layout->set_has_static_tls(); |
8851ecca | 1527 | if (parameters->options().shared()) |
7bf1f802 | 1528 | unsupported_reloc_local(object, r_type); |
2e30d253 | 1529 | break; |
e041f13d ILT |
1530 | |
1531 | default: | |
1532 | gold_unreachable(); | |
2e30d253 ILT |
1533 | } |
1534 | } | |
1535 | break; | |
fdc2f80f ILT |
1536 | |
1537 | case elfcpp::R_X86_64_SIZE32: | |
1538 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1539 | default: |
75f2446e | 1540 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
1541 | object->name().c_str(), r_type, |
1542 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
1543 | break; |
1544 | } | |
1545 | } | |
1546 | ||
1547 | // Scan relocations for a section. | |
1548 | ||
1549 | void | |
1550 | Target_x86_64::scan_relocs(const General_options& options, | |
d61c17ea ILT |
1551 | Symbol_table* symtab, |
1552 | Layout* layout, | |
1553 | Sized_relobj<64, false>* object, | |
1554 | unsigned int data_shndx, | |
1555 | unsigned int sh_type, | |
1556 | const unsigned char* prelocs, | |
1557 | size_t reloc_count, | |
730cdc88 ILT |
1558 | Output_section* output_section, |
1559 | bool needs_special_offset_handling, | |
d61c17ea | 1560 | size_t local_symbol_count, |
730cdc88 | 1561 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
1562 | { |
1563 | if (sh_type == elfcpp::SHT_REL) | |
1564 | { | |
75f2446e ILT |
1565 | gold_error(_("%s: unsupported REL reloc section"), |
1566 | object->name().c_str()); | |
1567 | return; | |
2e30d253 ILT |
1568 | } |
1569 | ||
1570 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
1571 | Target_x86_64::Scan>( | |
1572 | options, | |
1573 | symtab, | |
1574 | layout, | |
1575 | this, | |
1576 | object, | |
1577 | data_shndx, | |
1578 | prelocs, | |
1579 | reloc_count, | |
730cdc88 ILT |
1580 | output_section, |
1581 | needs_special_offset_handling, | |
2e30d253 | 1582 | local_symbol_count, |
730cdc88 | 1583 | plocal_symbols); |
2e30d253 ILT |
1584 | } |
1585 | ||
1586 | // Finalize the sections. | |
1587 | ||
1588 | void | |
1589 | Target_x86_64::do_finalize_sections(Layout* layout) | |
1590 | { | |
1591 | // Fill in some more dynamic tags. | |
1592 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
1593 | if (odyn != NULL) | |
1594 | { | |
1595 | if (this->got_plt_ != NULL) | |
1596 | odyn->add_section_address(elfcpp::DT_PLTGOT, this->got_plt_); | |
1597 | ||
1598 | if (this->plt_ != NULL) | |
1599 | { | |
1600 | const Output_data* od = this->plt_->rel_plt(); | |
1601 | odyn->add_section_size(elfcpp::DT_PLTRELSZ, od); | |
1602 | odyn->add_section_address(elfcpp::DT_JMPREL, od); | |
1603 | odyn->add_constant(elfcpp::DT_PLTREL, elfcpp::DT_RELA); | |
c2b45e22 CC |
1604 | if (this->plt_->has_tlsdesc_entry()) |
1605 | { | |
1606 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); | |
1607 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
1608 | this->got_->finalize_data_size(); | |
1609 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
1610 | this->plt_, plt_offset); | |
1611 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
1612 | this->got_, got_offset); | |
1613 | } | |
2e30d253 ILT |
1614 | } |
1615 | ||
0ffd9845 | 1616 | if (this->rela_dyn_ != NULL) |
2e30d253 | 1617 | { |
0ffd9845 | 1618 | const Output_data* od = this->rela_dyn_; |
2e30d253 | 1619 | odyn->add_section_address(elfcpp::DT_RELA, od); |
e84992bb | 1620 | odyn->add_section_size(elfcpp::DT_RELASZ, od); |
2e30d253 | 1621 | odyn->add_constant(elfcpp::DT_RELAENT, |
e84992bb | 1622 | elfcpp::Elf_sizes<64>::rela_size); |
2e30d253 ILT |
1623 | } |
1624 | ||
8851ecca | 1625 | if (!parameters->options().shared()) |
2e30d253 ILT |
1626 | { |
1627 | // The value of the DT_DEBUG tag is filled in by the dynamic | |
1628 | // linker at run time, and used by the debugger. | |
1629 | odyn->add_constant(elfcpp::DT_DEBUG, 0); | |
1630 | } | |
1631 | } | |
1632 | ||
1633 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
1634 | // relocs. | |
12c0daef ILT |
1635 | if (this->copy_relocs_.any_saved_relocs()) |
1636 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
2e30d253 ILT |
1637 | } |
1638 | ||
1639 | // Perform a relocation. | |
1640 | ||
1641 | inline bool | |
1642 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
1643 | Target_x86_64* target, | |
1644 | size_t relnum, | |
0ffd9845 | 1645 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
1646 | unsigned int r_type, |
1647 | const Sized_symbol<64>* gsym, | |
1648 | const Symbol_value<64>* psymval, | |
1649 | unsigned char* view, | |
1650 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 1651 | section_size_type view_size) |
2e30d253 ILT |
1652 | { |
1653 | if (this->skip_call_tls_get_addr_) | |
1654 | { | |
1655 | if (r_type != elfcpp::R_X86_64_PLT32 | |
1656 | || gsym == NULL | |
0ffd9845 | 1657 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 1658 | { |
75f2446e ILT |
1659 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1660 | _("missing expected TLS relocation")); | |
1661 | } | |
1662 | else | |
1663 | { | |
1664 | this->skip_call_tls_get_addr_ = false; | |
1665 | return false; | |
2e30d253 | 1666 | } |
2e30d253 ILT |
1667 | } |
1668 | ||
1669 | // Pick the value to use for symbols defined in shared objects. | |
1670 | Symbol_value<64> symval; | |
96f2030e | 1671 | if (gsym != NULL |
de4c45bd ILT |
1672 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
1673 | || r_type == elfcpp::R_X86_64_PC32 | |
1674 | || r_type == elfcpp::R_X86_64_PC16 | |
1675 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
1676 | { |
1677 | symval.set_output_value(target->plt_section()->address() | |
1678 | + gsym->plt_offset()); | |
1679 | psymval = &symval; | |
1680 | } | |
1681 | ||
1682 | const Sized_relobj<64, false>* object = relinfo->object; | |
0ffd9845 ILT |
1683 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
1684 | ||
1685 | // Get the GOT offset if needed. | |
96f2030e ILT |
1686 | // The GOT pointer points to the end of the GOT section. |
1687 | // We need to subtract the size of the GOT section to get | |
1688 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
1689 | bool have_got_offset = false; |
1690 | unsigned int got_offset = 0; | |
1691 | switch (r_type) | |
1692 | { | |
1693 | case elfcpp::R_X86_64_GOT32: | |
1694 | case elfcpp::R_X86_64_GOT64: | |
1695 | case elfcpp::R_X86_64_GOTPLT64: | |
1696 | case elfcpp::R_X86_64_GOTPCREL: | |
1697 | case elfcpp::R_X86_64_GOTPCREL64: | |
1698 | if (gsym != NULL) | |
1699 | { | |
0a65a3a7 CC |
1700 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
1701 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
1702 | } |
1703 | else | |
1704 | { | |
1705 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
1706 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
1707 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
1708 | - target->got_size()); | |
0ffd9845 ILT |
1709 | } |
1710 | have_got_offset = true; | |
1711 | break; | |
1712 | ||
1713 | default: | |
1714 | break; | |
1715 | } | |
2e30d253 ILT |
1716 | |
1717 | switch (r_type) | |
1718 | { | |
1719 | case elfcpp::R_X86_64_NONE: | |
e822f2b1 ILT |
1720 | case elfcpp::R_386_GNU_VTINHERIT: |
1721 | case elfcpp::R_386_GNU_VTENTRY: | |
2e30d253 ILT |
1722 | break; |
1723 | ||
1724 | case elfcpp::R_X86_64_64: | |
1725 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
1726 | break; | |
1727 | ||
1728 | case elfcpp::R_X86_64_PC64: | |
1729 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
1730 | address); | |
1731 | break; | |
1732 | ||
1733 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
1734 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1735 | // uint64_t x = value + addend; | |
1736 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
1737 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
1738 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1739 | break; | |
1740 | ||
1741 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
1742 | // FIXME: we need to verify that value + addend fits into 32 bits: |
1743 | // int64_t x = value + addend; // note this quantity is signed! | |
1744 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
1745 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
1746 | break; | |
1747 | ||
1748 | case elfcpp::R_X86_64_PC32: | |
1749 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
1750 | address); | |
1751 | break; | |
1752 | ||
1753 | case elfcpp::R_X86_64_16: | |
1754 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
1755 | break; | |
1756 | ||
1757 | case elfcpp::R_X86_64_PC16: | |
1758 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
1759 | address); | |
1760 | break; | |
1761 | ||
1762 | case elfcpp::R_X86_64_8: | |
1763 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
1764 | break; | |
1765 | ||
1766 | case elfcpp::R_X86_64_PC8: | |
1767 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
1768 | address); | |
1769 | break; | |
1770 | ||
1771 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
1772 | gold_assert(gsym == NULL |
1773 | || gsym->has_plt_offset() | |
99f8faca ILT |
1774 | || gsym->final_value_is_known() |
1775 | || (gsym->is_defined() | |
1776 | && !gsym->is_from_dynobj() | |
1777 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
1778 | // Note: while this code looks the same as for R_X86_64_PC32, it |
1779 | // behaves differently because psymval was set to point to | |
1780 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
1781 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
1782 | address); | |
1783 | break; | |
1784 | ||
ee9e9e86 ILT |
1785 | case elfcpp::R_X86_64_PLTOFF64: |
1786 | { | |
1787 | gold_assert(gsym); | |
1788 | gold_assert(gsym->has_plt_offset() | |
1789 | || gsym->final_value_is_known()); | |
1790 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
1791 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
1792 | Relocate_functions<64, false>::rela64(view, object, psymval, |
1793 | addend - got_address); | |
ee9e9e86 ILT |
1794 | } |
1795 | ||
2e30d253 | 1796 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
1797 | gold_assert(have_got_offset); |
1798 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
1799 | break; |
1800 | ||
e822f2b1 ILT |
1801 | case elfcpp::R_X86_64_GOTPC32: |
1802 | { | |
1803 | gold_assert(gsym); | |
1804 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1805 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1806 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
1807 | } | |
1808 | break; | |
1809 | ||
1810 | case elfcpp::R_X86_64_GOT64: | |
1811 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
1812 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 1813 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1814 | gold_assert(have_got_offset); |
1815 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
1816 | break; |
1817 | ||
1818 | case elfcpp::R_X86_64_GOTPC64: | |
1819 | { | |
1820 | gold_assert(gsym); | |
1821 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1822 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
1823 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
1824 | } | |
1825 | break; | |
1826 | ||
2e30d253 ILT |
1827 | case elfcpp::R_X86_64_GOTOFF64: |
1828 | { | |
1829 | elfcpp::Elf_types<64>::Elf_Addr value; | |
1830 | value = (psymval->value(object, 0) | |
96f2030e | 1831 | - target->got_plt_section()->address()); |
2e30d253 ILT |
1832 | Relocate_functions<64, false>::rela64(view, value, addend); |
1833 | } | |
1834 | break; | |
1835 | ||
1836 | case elfcpp::R_X86_64_GOTPCREL: | |
1837 | { | |
0ffd9845 ILT |
1838 | gold_assert(have_got_offset); |
1839 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1840 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1841 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
1842 | } |
1843 | break; | |
1844 | ||
e822f2b1 ILT |
1845 | case elfcpp::R_X86_64_GOTPCREL64: |
1846 | { | |
0ffd9845 ILT |
1847 | gold_assert(have_got_offset); |
1848 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 1849 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 1850 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
1851 | } |
1852 | break; | |
1853 | ||
2e30d253 ILT |
1854 | case elfcpp::R_X86_64_COPY: |
1855 | case elfcpp::R_X86_64_GLOB_DAT: | |
1856 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1857 | case elfcpp::R_X86_64_RELATIVE: | |
d61c17ea | 1858 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1859 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1860 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1861 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1862 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1863 | _("unexpected reloc %u in object file"), | |
1864 | r_type); | |
2e30d253 ILT |
1865 | break; |
1866 | ||
d61c17ea | 1867 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1868 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1869 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1870 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1871 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1872 | case elfcpp::R_X86_64_DTPOFF32: |
1873 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1874 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1875 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
1876 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
1877 | view, address, view_size); | |
2e30d253 | 1878 | break; |
2e30d253 | 1879 | |
fdc2f80f ILT |
1880 | case elfcpp::R_X86_64_SIZE32: |
1881 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1882 | default: |
75f2446e ILT |
1883 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
1884 | _("unsupported reloc %u"), | |
1885 | r_type); | |
2e30d253 ILT |
1886 | break; |
1887 | } | |
1888 | ||
1889 | return true; | |
1890 | } | |
1891 | ||
1892 | // Perform a TLS relocation. | |
1893 | ||
1894 | inline void | |
d61c17ea | 1895 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 1896 | Target_x86_64* target, |
d61c17ea | 1897 | size_t relnum, |
72ec2876 | 1898 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
1899 | unsigned int r_type, |
1900 | const Sized_symbol<64>* gsym, | |
1901 | const Symbol_value<64>* psymval, | |
1902 | unsigned char* view, | |
6a41d30b | 1903 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 1904 | section_size_type view_size) |
2e30d253 | 1905 | { |
2e30d253 | 1906 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
1907 | |
1908 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 1909 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2e30d253 ILT |
1910 | |
1911 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
1912 | ||
1913 | const bool is_final = (gsym == NULL | |
8851ecca | 1914 | ? !parameters->options().output_is_position_independent() |
2e30d253 | 1915 | : gsym->final_value_is_known()); |
e041f13d ILT |
1916 | const tls::Tls_optimization optimized_type |
1917 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1918 | switch (r_type) |
1919 | { | |
56622147 | 1920 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
497897f9 | 1921 | this->saw_tls_block_reloc_ = true; |
e041f13d | 1922 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 1923 | { |
7bf1f802 | 1924 | gold_assert(tls_segment != NULL); |
2e30d253 | 1925 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 1926 | rela, r_type, value, view, |
2e30d253 ILT |
1927 | view_size); |
1928 | break; | |
1929 | } | |
7bf1f802 ILT |
1930 | else |
1931 | { | |
c2b45e22 CC |
1932 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
1933 | ? GOT_TYPE_TLS_OFFSET | |
1934 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
1935 | unsigned int got_offset; |
1936 | if (gsym != NULL) | |
1937 | { | |
c2b45e22 CC |
1938 | gold_assert(gsym->has_got_offset(got_type)); |
1939 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
1940 | } |
1941 | else | |
1942 | { | |
1943 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
1944 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
1945 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
1946 | - target->got_size()); |
1947 | } | |
1948 | if (optimized_type == tls::TLSOPT_TO_IE) | |
1949 | { | |
1950 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 1951 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 1952 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 1953 | value, view, address, view_size); |
7bf1f802 ILT |
1954 | break; |
1955 | } | |
1956 | else if (optimized_type == tls::TLSOPT_NONE) | |
1957 | { | |
1958 | // Relocate the field with the offset of the pair of GOT | |
1959 | // entries. | |
6a41d30b ILT |
1960 | value = target->got_plt_section()->address() + got_offset; |
1961 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
1962 | address); | |
7bf1f802 ILT |
1963 | break; |
1964 | } | |
1965 | } | |
72ec2876 | 1966 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 1967 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
1968 | break; |
1969 | ||
c2b45e22 CC |
1970 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
1971 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
497897f9 | 1972 | this->saw_tls_block_reloc_ = true; |
c2b45e22 CC |
1973 | if (optimized_type == tls::TLSOPT_TO_LE) |
1974 | { | |
1975 | gold_assert(tls_segment != NULL); | |
1976 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
1977 | rela, r_type, value, view, | |
1978 | view_size); | |
1979 | break; | |
1980 | } | |
1981 | else | |
1982 | { | |
1983 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
1984 | ? GOT_TYPE_TLS_OFFSET | |
1985 | : GOT_TYPE_TLS_DESC); | |
1986 | unsigned int got_offset; | |
1987 | if (gsym != NULL) | |
1988 | { | |
1989 | gold_assert(gsym->has_got_offset(got_type)); | |
1990 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
1991 | } | |
1992 | else | |
1993 | { | |
1994 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
1995 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
1996 | got_offset = (object->local_got_offset(r_sym, got_type) | |
1997 | - target->got_size()); | |
1998 | } | |
1999 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2000 | { | |
2001 | gold_assert(tls_segment != NULL); | |
2002 | value = target->got_plt_section()->address() + got_offset; | |
2003 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2004 | rela, r_type, value, view, address, | |
2005 | view_size); | |
2006 | break; | |
2007 | } | |
2008 | else if (optimized_type == tls::TLSOPT_NONE) | |
2009 | { | |
2010 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2011 | { | |
2012 | // Relocate the field with the offset of the pair of GOT | |
2013 | // entries. | |
2014 | value = target->got_plt_section()->address() + got_offset; | |
2015 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2016 | address); | |
2017 | } | |
2018 | break; | |
2019 | } | |
2020 | } | |
2021 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2022 | _("unsupported reloc %u"), r_type); | |
2023 | break; | |
2024 | ||
56622147 | 2025 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
497897f9 | 2026 | this->saw_tls_block_reloc_ = true; |
e041f13d ILT |
2027 | if (optimized_type == tls::TLSOPT_TO_LE) |
2028 | { | |
7bf1f802 | 2029 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2030 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2031 | value, view, view_size); | |
2032 | break; | |
e041f13d | 2033 | } |
7bf1f802 ILT |
2034 | else if (optimized_type == tls::TLSOPT_NONE) |
2035 | { | |
2036 | // Relocate the field with the offset of the GOT entry for | |
2037 | // the module index. | |
2038 | unsigned int got_offset; | |
31d60480 ILT |
2039 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2040 | - target->got_size()); | |
6a41d30b ILT |
2041 | value = target->got_plt_section()->address() + got_offset; |
2042 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2043 | address); | |
7bf1f802 ILT |
2044 | break; |
2045 | } | |
72ec2876 | 2046 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2047 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2048 | break; |
0ffd9845 ILT |
2049 | |
2050 | case elfcpp::R_X86_64_DTPOFF32: | |
7bf1f802 | 2051 | gold_assert(tls_segment != NULL); |
e041f13d | 2052 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2053 | { |
2054 | // This relocation type is used in debugging information. | |
2055 | // In that case we need to not optimize the value. If we | |
2056 | // haven't seen a TLSLD reloc, then we assume we should not | |
2057 | // optimize this reloc. | |
2058 | if (this->saw_tls_block_reloc_) | |
2059 | value -= tls_segment->memsz(); | |
2060 | } | |
d85c80a3 | 2061 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2062 | break; |
2063 | ||
2064 | case elfcpp::R_X86_64_DTPOFF64: | |
7bf1f802 | 2065 | gold_assert(tls_segment != NULL); |
e041f13d | 2066 | if (optimized_type == tls::TLSOPT_TO_LE) |
497897f9 ILT |
2067 | { |
2068 | // See R_X86_64_DTPOFF32, just above, for why we test this. | |
2069 | if (this->saw_tls_block_reloc_) | |
2070 | value -= tls_segment->memsz(); | |
2071 | } | |
d85c80a3 | 2072 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2073 | break; |
2e30d253 | 2074 | |
56622147 ILT |
2075 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2076 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2077 | { | |
7bf1f802 | 2078 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2079 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2080 | rela, r_type, value, view, | |
2081 | view_size); | |
2082 | break; | |
2083 | } | |
7bf1f802 ILT |
2084 | else if (optimized_type == tls::TLSOPT_NONE) |
2085 | { | |
2086 | // Relocate the field with the offset of the GOT entry for | |
2087 | // the tp-relative offset of the symbol. | |
2088 | unsigned int got_offset; | |
2089 | if (gsym != NULL) | |
2090 | { | |
0a65a3a7 CC |
2091 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2092 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2093 | - target->got_size()); | |
7bf1f802 ILT |
2094 | } |
2095 | else | |
2096 | { | |
2097 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2098 | gold_assert(object->local_has_got_offset(r_sym, |
2099 | GOT_TYPE_TLS_OFFSET)); | |
2100 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2101 | - target->got_size()); |
2102 | } | |
6a41d30b ILT |
2103 | value = target->got_plt_section()->address() + got_offset; |
2104 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2105 | break; |
2106 | } | |
56622147 ILT |
2107 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2108 | _("unsupported reloc type %u"), | |
2109 | r_type); | |
2110 | break; | |
0ffd9845 | 2111 | |
56622147 | 2112 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2113 | value -= tls_segment->memsz(); |
d85c80a3 | 2114 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2115 | break; |
2e30d253 | 2116 | } |
2e30d253 ILT |
2117 | } |
2118 | ||
7bf1f802 ILT |
2119 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2120 | // Initial-Exec. | |
2121 | ||
2122 | inline void | |
2123 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2124 | size_t relnum, | |
c2b45e22 | 2125 | Output_segment*, |
7bf1f802 ILT |
2126 | const elfcpp::Rela<64, false>& rela, |
2127 | unsigned int, | |
2128 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2129 | unsigned char* view, | |
c2b45e22 | 2130 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2131 | section_size_type view_size) |
7bf1f802 ILT |
2132 | { |
2133 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2134 | // .word 0x6666; rex64; call __tls_get_addr | |
2135 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2136 | ||
2137 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2138 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2139 | ||
2140 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2141 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2142 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2143 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2144 | ||
2145 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2146 | ||
c2b45e22 CC |
2147 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2148 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2149 | |
2150 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2151 | // We can skip it. | |
2152 | this->skip_call_tls_get_addr_ = true; | |
2153 | } | |
2154 | ||
e041f13d | 2155 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2156 | // Local-Exec. |
2157 | ||
2158 | inline void | |
d61c17ea ILT |
2159 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2160 | size_t relnum, | |
2161 | Output_segment* tls_segment, | |
72ec2876 | 2162 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2163 | unsigned int, |
2164 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2165 | unsigned char* view, | |
fe8718a4 | 2166 | section_size_type view_size) |
2e30d253 | 2167 | { |
0ffd9845 ILT |
2168 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2169 | // .word 0x6666; rex64; call __tls_get_addr | |
2170 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2171 | |
72ec2876 ILT |
2172 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2173 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2174 | |
72ec2876 ILT |
2175 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2176 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2177 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2178 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2179 | |
0ffd9845 | 2180 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2181 | |
6a41d30b | 2182 | value -= tls_segment->memsz(); |
0ffd9845 | 2183 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2184 | |
2185 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2186 | // We can skip it. | |
2187 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2188 | } |
2189 | ||
c2b45e22 CC |
2190 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2191 | ||
2192 | inline void | |
2193 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2194 | const Relocate_info<64, false>* relinfo, | |
2195 | size_t relnum, | |
2196 | Output_segment*, | |
2197 | const elfcpp::Rela<64, false>& rela, | |
2198 | unsigned int r_type, | |
2199 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2200 | unsigned char* view, | |
2201 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2202 | section_size_type view_size) | |
2203 | { | |
2204 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2205 | { | |
2206 | // leaq foo@tlsdesc(%rip), %rax | |
2207 | // ==> movq foo@gottpoff(%rip), %rax | |
2208 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2209 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2210 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2211 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2212 | view[-2] = 0x8b; | |
2213 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2214 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2215 | } | |
2216 | else | |
2217 | { | |
2218 | // call *foo@tlscall(%rax) | |
2219 | // ==> nop; nop | |
2220 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2221 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2222 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2223 | view[0] == 0xff && view[1] == 0x10); | |
2224 | view[0] = 0x66; | |
2225 | view[1] = 0x90; | |
2226 | } | |
2227 | } | |
2228 | ||
2229 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2230 | ||
2231 | inline void | |
2232 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2233 | const Relocate_info<64, false>* relinfo, | |
2234 | size_t relnum, | |
2235 | Output_segment* tls_segment, | |
2236 | const elfcpp::Rela<64, false>& rela, | |
2237 | unsigned int r_type, | |
2238 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2239 | unsigned char* view, | |
2240 | section_size_type view_size) | |
2241 | { | |
2242 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2243 | { | |
2244 | // leaq foo@tlsdesc(%rip), %rax | |
2245 | // ==> movq foo@tpoff, %rax | |
2246 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2247 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2248 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2249 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2250 | view[-2] = 0xc7; | |
2251 | view[-1] = 0xc0; | |
2252 | value -= tls_segment->memsz(); | |
2253 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2254 | } | |
2255 | else | |
2256 | { | |
2257 | // call *foo@tlscall(%rax) | |
2258 | // ==> nop; nop | |
2259 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2260 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2261 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2262 | view[0] == 0xff && view[1] == 0x10); | |
2263 | view[0] = 0x66; | |
2264 | view[1] = 0x90; | |
2265 | } | |
2266 | } | |
2267 | ||
2e30d253 | 2268 | inline void |
72ec2876 ILT |
2269 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2270 | size_t relnum, | |
2271 | Output_segment*, | |
2272 | const elfcpp::Rela<64, false>& rela, | |
2273 | unsigned int, | |
2274 | elfcpp::Elf_types<64>::Elf_Addr, | |
2275 | unsigned char* view, | |
fe8718a4 | 2276 | section_size_type view_size) |
2e30d253 | 2277 | { |
72ec2876 ILT |
2278 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2279 | // ... leq foo@dtpoff(%rax),%reg | |
2280 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2281 | |
72ec2876 ILT |
2282 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2283 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2284 | |
72ec2876 ILT |
2285 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2286 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2287 | ||
2288 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2289 | ||
2290 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2291 | ||
2292 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2293 | // We can skip it. | |
2294 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2295 | } |
2296 | ||
56622147 ILT |
2297 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2298 | // Local-Exec. | |
2299 | ||
2300 | inline void | |
2301 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2302 | size_t relnum, | |
2303 | Output_segment* tls_segment, | |
2304 | const elfcpp::Rela<64, false>& rela, | |
2305 | unsigned int, | |
2306 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2307 | unsigned char* view, | |
fe8718a4 | 2308 | section_size_type view_size) |
56622147 ILT |
2309 | { |
2310 | // We need to examine the opcodes to figure out which instruction we | |
2311 | // are looking at. | |
2312 | ||
2313 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2314 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2315 | ||
2316 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2317 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2318 | ||
2319 | unsigned char op1 = view[-3]; | |
2320 | unsigned char op2 = view[-2]; | |
2321 | unsigned char op3 = view[-1]; | |
2322 | unsigned char reg = op3 >> 3; | |
2323 | ||
2324 | if (op2 == 0x8b) | |
2325 | { | |
2326 | // movq | |
2327 | if (op1 == 0x4c) | |
2328 | view[-3] = 0x49; | |
2329 | view[-2] = 0xc7; | |
2330 | view[-1] = 0xc0 | reg; | |
2331 | } | |
2332 | else if (reg == 4) | |
2333 | { | |
2334 | // Special handling for %rsp. | |
2335 | if (op1 == 0x4c) | |
2336 | view[-3] = 0x49; | |
2337 | view[-2] = 0x81; | |
2338 | view[-1] = 0xc0 | reg; | |
2339 | } | |
2340 | else | |
2341 | { | |
2342 | // addq | |
2343 | if (op1 == 0x4c) | |
2344 | view[-3] = 0x4d; | |
2345 | view[-2] = 0x8d; | |
2346 | view[-1] = 0x80 | reg | (reg << 3); | |
2347 | } | |
2348 | ||
6a41d30b | 2349 | value -= tls_segment->memsz(); |
56622147 ILT |
2350 | Relocate_functions<64, false>::rela32(view, value, 0); |
2351 | } | |
2352 | ||
2e30d253 ILT |
2353 | // Relocate section data. |
2354 | ||
2355 | void | |
2356 | Target_x86_64::relocate_section(const Relocate_info<64, false>* relinfo, | |
d61c17ea ILT |
2357 | unsigned int sh_type, |
2358 | const unsigned char* prelocs, | |
2359 | size_t reloc_count, | |
730cdc88 ILT |
2360 | Output_section* output_section, |
2361 | bool needs_special_offset_handling, | |
d61c17ea ILT |
2362 | unsigned char* view, |
2363 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2364 | section_size_type view_size) |
2e30d253 ILT |
2365 | { |
2366 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2367 | ||
2368 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2369 | Target_x86_64::Relocate>( | |
2370 | relinfo, | |
2371 | this, | |
2372 | prelocs, | |
2373 | reloc_count, | |
730cdc88 ILT |
2374 | output_section, |
2375 | needs_special_offset_handling, | |
2e30d253 ILT |
2376 | view, |
2377 | address, | |
2378 | view_size); | |
2379 | } | |
2380 | ||
6a74a719 ILT |
2381 | // Return the size of a relocation while scanning during a relocatable |
2382 | // link. | |
2383 | ||
2384 | unsigned int | |
2385 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2386 | unsigned int r_type, | |
2387 | Relobj* object) | |
2388 | { | |
2389 | switch (r_type) | |
2390 | { | |
2391 | case elfcpp::R_X86_64_NONE: | |
2392 | case elfcpp::R_386_GNU_VTINHERIT: | |
2393 | case elfcpp::R_386_GNU_VTENTRY: | |
2394 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2395 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2396 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2397 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2398 | case elfcpp::R_X86_64_DTPOFF32: | |
2399 | case elfcpp::R_X86_64_DTPOFF64: | |
2400 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2401 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2402 | return 0; | |
2403 | ||
2404 | case elfcpp::R_X86_64_64: | |
2405 | case elfcpp::R_X86_64_PC64: | |
2406 | case elfcpp::R_X86_64_GOTOFF64: | |
2407 | case elfcpp::R_X86_64_GOTPC64: | |
2408 | case elfcpp::R_X86_64_PLTOFF64: | |
2409 | case elfcpp::R_X86_64_GOT64: | |
2410 | case elfcpp::R_X86_64_GOTPCREL64: | |
2411 | case elfcpp::R_X86_64_GOTPCREL: | |
2412 | case elfcpp::R_X86_64_GOTPLT64: | |
2413 | return 8; | |
2414 | ||
2415 | case elfcpp::R_X86_64_32: | |
2416 | case elfcpp::R_X86_64_32S: | |
2417 | case elfcpp::R_X86_64_PC32: | |
2418 | case elfcpp::R_X86_64_PLT32: | |
2419 | case elfcpp::R_X86_64_GOTPC32: | |
2420 | case elfcpp::R_X86_64_GOT32: | |
2421 | return 4; | |
2422 | ||
2423 | case elfcpp::R_X86_64_16: | |
2424 | case elfcpp::R_X86_64_PC16: | |
2425 | return 2; | |
2426 | ||
2427 | case elfcpp::R_X86_64_8: | |
2428 | case elfcpp::R_X86_64_PC8: | |
2429 | return 1; | |
2430 | ||
2431 | case elfcpp::R_X86_64_COPY: | |
2432 | case elfcpp::R_X86_64_GLOB_DAT: | |
2433 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2434 | case elfcpp::R_X86_64_RELATIVE: | |
2435 | // These are outstanding tls relocs, which are unexpected when linking | |
2436 | case elfcpp::R_X86_64_TPOFF64: | |
2437 | case elfcpp::R_X86_64_DTPMOD64: | |
2438 | case elfcpp::R_X86_64_TLSDESC: | |
2439 | object->error(_("unexpected reloc %u in object file"), r_type); | |
2440 | return 0; | |
2441 | ||
2442 | case elfcpp::R_X86_64_SIZE32: | |
2443 | case elfcpp::R_X86_64_SIZE64: | |
2444 | default: | |
2445 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
2446 | return 0; | |
2447 | } | |
2448 | } | |
2449 | ||
2450 | // Scan the relocs during a relocatable link. | |
2451 | ||
2452 | void | |
2453 | Target_x86_64::scan_relocatable_relocs(const General_options& options, | |
2454 | Symbol_table* symtab, | |
2455 | Layout* layout, | |
2456 | Sized_relobj<64, false>* object, | |
2457 | unsigned int data_shndx, | |
2458 | unsigned int sh_type, | |
2459 | const unsigned char* prelocs, | |
2460 | size_t reloc_count, | |
2461 | Output_section* output_section, | |
2462 | bool needs_special_offset_handling, | |
2463 | size_t local_symbol_count, | |
2464 | const unsigned char* plocal_symbols, | |
2465 | Relocatable_relocs* rr) | |
2466 | { | |
2467 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2468 | ||
2469 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
2470 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
2471 | ||
7019cd25 | 2472 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 ILT |
2473 | Scan_relocatable_relocs>( |
2474 | options, | |
2475 | symtab, | |
2476 | layout, | |
2477 | object, | |
2478 | data_shndx, | |
2479 | prelocs, | |
2480 | reloc_count, | |
2481 | output_section, | |
2482 | needs_special_offset_handling, | |
2483 | local_symbol_count, | |
2484 | plocal_symbols, | |
2485 | rr); | |
2486 | } | |
2487 | ||
2488 | // Relocate a section during a relocatable link. | |
2489 | ||
2490 | void | |
2491 | Target_x86_64::relocate_for_relocatable( | |
2492 | const Relocate_info<64, false>* relinfo, | |
2493 | unsigned int sh_type, | |
2494 | const unsigned char* prelocs, | |
2495 | size_t reloc_count, | |
2496 | Output_section* output_section, | |
2497 | off_t offset_in_output_section, | |
2498 | const Relocatable_relocs* rr, | |
2499 | unsigned char* view, | |
2500 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
2501 | section_size_type view_size, | |
2502 | unsigned char* reloc_view, | |
2503 | section_size_type reloc_view_size) | |
2504 | { | |
2505 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2506 | ||
7019cd25 | 2507 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
2508 | relinfo, |
2509 | prelocs, | |
2510 | reloc_count, | |
2511 | output_section, | |
2512 | offset_in_output_section, | |
2513 | rr, | |
2514 | view, | |
2515 | view_address, | |
2516 | view_size, | |
2517 | reloc_view, | |
2518 | reloc_view_size); | |
2519 | } | |
2520 | ||
4fb6c25d ILT |
2521 | // Return the value to use for a dynamic which requires special |
2522 | // treatment. This is how we support equality comparisons of function | |
2523 | // pointers across shared library boundaries, as described in the | |
2524 | // processor specific ABI supplement. | |
2525 | ||
2526 | uint64_t | |
2527 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
2528 | { | |
2529 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
2530 | return this->plt_section()->address() + gsym->plt_offset(); | |
2531 | } | |
2532 | ||
2e30d253 ILT |
2533 | // Return a string used to fill a code section with nops to take up |
2534 | // the specified length. | |
2535 | ||
2536 | std::string | |
8851ecca | 2537 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
2538 | { |
2539 | if (length >= 16) | |
2540 | { | |
2541 | // Build a jmpq instruction to skip over the bytes. | |
2542 | unsigned char jmp[5]; | |
2543 | jmp[0] = 0xe9; | |
04bf7072 | 2544 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
2545 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2546 | + std::string(length - 5, '\0')); | |
2547 | } | |
2548 | ||
2549 | // Nop sequences of various lengths. | |
2550 | const char nop1[1] = { 0x90 }; // nop | |
2551 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
2552 | const char nop3[3] = { 0x8d, 0x76, 0x00 }; // leal 0(%esi),%esi | |
2553 | const char nop4[4] = { 0x8d, 0x74, 0x26, 0x00}; // leal 0(%esi,1),%esi | |
2554 | const char nop5[5] = { 0x90, 0x8d, 0x74, 0x26, // nop | |
2555 | 0x00 }; // leal 0(%esi,1),%esi | |
2556 | const char nop6[6] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2557 | 0x00, 0x00 }; | |
2558 | const char nop7[7] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2559 | 0x00, 0x00, 0x00 }; | |
2560 | const char nop8[8] = { 0x90, 0x8d, 0xb4, 0x26, // nop | |
2561 | 0x00, 0x00, 0x00, 0x00 }; // leal 0L(%esi,1),%esi | |
2562 | const char nop9[9] = { 0x89, 0xf6, 0x8d, 0xbc, // movl %esi,%esi | |
2563 | 0x27, 0x00, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2564 | 0x00 }; | |
2565 | const char nop10[10] = { 0x8d, 0x76, 0x00, 0x8d, // leal 0(%esi),%esi | |
2566 | 0xbc, 0x27, 0x00, 0x00, // leal 0L(%edi,1),%edi | |
2567 | 0x00, 0x00 }; | |
2568 | const char nop11[11] = { 0x8d, 0x74, 0x26, 0x00, // leal 0(%esi,1),%esi | |
2569 | 0x8d, 0xbc, 0x27, 0x00, // leal 0L(%edi,1),%edi | |
2570 | 0x00, 0x00, 0x00 }; | |
2571 | const char nop12[12] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2572 | 0x00, 0x00, 0x8d, 0xbf, // leal 0L(%edi),%edi | |
2573 | 0x00, 0x00, 0x00, 0x00 }; | |
2574 | const char nop13[13] = { 0x8d, 0xb6, 0x00, 0x00, // leal 0L(%esi),%esi | |
2575 | 0x00, 0x00, 0x8d, 0xbc, // leal 0L(%edi,1),%edi | |
2576 | 0x27, 0x00, 0x00, 0x00, | |
2577 | 0x00 }; | |
2578 | const char nop14[14] = { 0x8d, 0xb4, 0x26, 0x00, // leal 0L(%esi,1),%esi | |
2579 | 0x00, 0x00, 0x00, 0x8d, // leal 0L(%edi,1),%edi | |
2580 | 0xbc, 0x27, 0x00, 0x00, | |
2581 | 0x00, 0x00 }; | |
2582 | const char nop15[15] = { 0xeb, 0x0d, 0x90, 0x90, // jmp .+15 | |
2583 | 0x90, 0x90, 0x90, 0x90, // nop,nop,nop,... | |
2584 | 0x90, 0x90, 0x90, 0x90, | |
2585 | 0x90, 0x90, 0x90 }; | |
2586 | ||
2587 | const char* nops[16] = { | |
2588 | NULL, | |
2589 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
2590 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
2591 | }; | |
2592 | ||
2593 | return std::string(nops[length], length); | |
2594 | } | |
2595 | ||
2596 | // The selector for x86_64 object files. | |
2597 | ||
2598 | class Target_selector_x86_64 : public Target_selector | |
2599 | { | |
2600 | public: | |
2601 | Target_selector_x86_64() | |
e96caa79 | 2602 | : Target_selector(elfcpp::EM_X86_64, 64, false, "elf64-x86-64") |
2e30d253 ILT |
2603 | { } |
2604 | ||
2605 | Target* | |
e96caa79 ILT |
2606 | do_instantiate_target() |
2607 | { return new Target_x86_64(); } | |
2e30d253 ILT |
2608 | }; |
2609 | ||
2e30d253 ILT |
2610 | Target_selector_x86_64 target_selector_x86_64; |
2611 | ||
2612 | } // End anonymous namespace. |