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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
a8df5856 | 3 | // Copyright 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. |
2e30d253 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8b105e34 ILT |
8 | // This program is free software; you can redistribute it and/or modify |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
2e30d253 ILT |
11 | // (at your option) any later version. |
12 | ||
8b105e34 ILT |
13 | // This program is distributed in the hope that it will be useful, |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
2e30d253 ILT |
22 | |
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
26 | ||
27 | #include "elfcpp.h" | |
28 | #include "parameters.h" | |
29 | #include "reloc.h" | |
30 | #include "x86_64.h" | |
31 | #include "object.h" | |
32 | #include "symtab.h" | |
33 | #include "layout.h" | |
34 | #include "output.h" | |
12c0daef | 35 | #include "copy-relocs.h" |
2e30d253 ILT |
36 | #include "target.h" |
37 | #include "target-reloc.h" | |
38 | #include "target-select.h" | |
e041f13d | 39 | #include "tls.h" |
36959681 | 40 | #include "freebsd.h" |
f345227a | 41 | #include "gc.h" |
21bb3914 | 42 | #include "icf.h" |
2e30d253 ILT |
43 | |
44 | namespace | |
45 | { | |
46 | ||
47 | using namespace gold; | |
48 | ||
7223e9ca ILT |
49 | // A class to handle the PLT data. |
50 | ||
51 | class Output_data_plt_x86_64 : public Output_section_data | |
52 | { | |
53 | public: | |
54 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; | |
55 | ||
56 | Output_data_plt_x86_64(Symbol_table*, Layout*, Output_data_got<64, false>*, | |
57 | Output_data_space*); | |
58 | ||
59 | // Add an entry to the PLT. | |
60 | void | |
61 | add_entry(Symbol* gsym); | |
62 | ||
63 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
64 | unsigned int | |
65 | add_local_ifunc_entry(Sized_relobj<64, false>* relobj, | |
66 | unsigned int local_sym_index); | |
67 | ||
68 | // Add the reserved TLSDESC_PLT entry to the PLT. | |
69 | void | |
70 | reserve_tlsdesc_entry(unsigned int got_offset) | |
71 | { this->tlsdesc_got_offset_ = got_offset; } | |
72 | ||
73 | // Return true if a TLSDESC_PLT entry has been reserved. | |
74 | bool | |
75 | has_tlsdesc_entry() const | |
76 | { return this->tlsdesc_got_offset_ != -1U; } | |
77 | ||
78 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
79 | unsigned int | |
80 | get_tlsdesc_got_offset() const | |
81 | { return this->tlsdesc_got_offset_; } | |
82 | ||
83 | // Return the offset of the reserved TLSDESC_PLT entry. | |
84 | unsigned int | |
85 | get_tlsdesc_plt_offset() const | |
86 | { return (this->count_ + 1) * plt_entry_size; } | |
87 | ||
88 | // Return the .rela.plt section data. | |
89 | Reloc_section* | |
90 | rela_plt() | |
91 | { return this->rel_; } | |
92 | ||
93 | // Return where the TLSDESC relocations should go. | |
94 | Reloc_section* | |
95 | rela_tlsdesc(Layout*); | |
96 | ||
97 | // Return the number of PLT entries. | |
98 | unsigned int | |
99 | entry_count() const | |
100 | { return this->count_; } | |
101 | ||
102 | // Return the offset of the first non-reserved PLT entry. | |
103 | static unsigned int | |
104 | first_plt_entry_offset() | |
105 | { return plt_entry_size; } | |
106 | ||
107 | // Return the size of a PLT entry. | |
108 | static unsigned int | |
109 | get_plt_entry_size() | |
110 | { return plt_entry_size; } | |
111 | ||
112 | protected: | |
113 | void | |
114 | do_adjust_output_section(Output_section* os); | |
115 | ||
116 | // Write to a map file. | |
117 | void | |
118 | do_print_to_mapfile(Mapfile* mapfile) const | |
119 | { mapfile->print_output_data(this, _("** PLT")); } | |
120 | ||
121 | private: | |
122 | // The size of an entry in the PLT. | |
123 | static const int plt_entry_size = 16; | |
124 | ||
125 | // The first entry in the PLT. | |
126 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
127 | // procedure linkage table for both programs and shared objects." | |
128 | static unsigned char first_plt_entry[plt_entry_size]; | |
129 | ||
130 | // Other entries in the PLT for an executable. | |
131 | static unsigned char plt_entry[plt_entry_size]; | |
132 | ||
133 | // The reserved TLSDESC entry in the PLT for an executable. | |
134 | static unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
135 | ||
136 | // Set the final size. | |
137 | void | |
138 | set_final_data_size(); | |
139 | ||
140 | // Write out the PLT data. | |
141 | void | |
142 | do_write(Output_file*); | |
143 | ||
144 | // The reloc section. | |
145 | Reloc_section* rel_; | |
146 | // The TLSDESC relocs, if necessary. These must follow the regular | |
147 | // PLT relocs. | |
148 | Reloc_section* tlsdesc_rel_; | |
149 | // The .got section. | |
150 | Output_data_got<64, false>* got_; | |
151 | // The .got.plt section. | |
152 | Output_data_space* got_plt_; | |
153 | // The number of PLT entries. | |
154 | unsigned int count_; | |
155 | // Offset of the reserved TLSDESC_GOT entry when needed. | |
156 | unsigned int tlsdesc_got_offset_; | |
157 | }; | |
2e30d253 ILT |
158 | |
159 | // The x86_64 target class. | |
d61c17ea ILT |
160 | // See the ABI at |
161 | // http://www.x86-64.org/documentation/abi.pdf | |
162 | // TLS info comes from | |
163 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 164 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 165 | |
36959681 | 166 | class Target_x86_64 : public Target_freebsd<64, false> |
2e30d253 ILT |
167 | { |
168 | public: | |
e822f2b1 ILT |
169 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
170 | // uses only Elf64_Rela relocation entries with explicit addends." | |
2e30d253 ILT |
171 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, 64, false> Reloc_section; |
172 | ||
173 | Target_x86_64() | |
36959681 | 174 | : Target_freebsd<64, false>(&x86_64_info), |
a8df5856 ILT |
175 | got_(NULL), plt_(NULL), got_plt_(NULL), got_tlsdesc_(NULL), |
176 | global_offset_table_(NULL), rela_dyn_(NULL), | |
177 | copy_relocs_(elfcpp::R_X86_64_COPY), dynbss_(NULL), | |
e291e7b9 ILT |
178 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
179 | tls_base_symbol_defined_(false) | |
2e30d253 ILT |
180 | { } |
181 | ||
21bb3914 ST |
182 | // This function should be defined in targets that can use relocation |
183 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
184 | // and global_reloc_may_be_function_pointer) | |
185 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
186 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
187 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
188 | inline bool | |
189 | can_check_for_function_pointers() const | |
190 | { return !parameters->options().pie(); } | |
191 | ||
c95e9f27 ST |
192 | virtual bool |
193 | can_icf_inline_merge_sections () const | |
194 | { return true; } | |
195 | ||
8a5e3e08 ILT |
196 | // Hook for a new output section. |
197 | void | |
198 | do_new_output_section(Output_section*) const; | |
199 | ||
6d03d481 ST |
200 | // Scan the relocations to look for symbol adjustments. |
201 | void | |
ad0f2072 | 202 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
203 | Layout* layout, |
204 | Sized_relobj<64, false>* object, | |
205 | unsigned int data_shndx, | |
206 | unsigned int sh_type, | |
207 | const unsigned char* prelocs, | |
208 | size_t reloc_count, | |
209 | Output_section* output_section, | |
210 | bool needs_special_offset_handling, | |
211 | size_t local_symbol_count, | |
212 | const unsigned char* plocal_symbols); | |
213 | ||
2e30d253 ILT |
214 | // Scan the relocations to look for symbol adjustments. |
215 | void | |
ad0f2072 | 216 | scan_relocs(Symbol_table* symtab, |
2e30d253 ILT |
217 | Layout* layout, |
218 | Sized_relobj<64, false>* object, | |
219 | unsigned int data_shndx, | |
220 | unsigned int sh_type, | |
221 | const unsigned char* prelocs, | |
222 | size_t reloc_count, | |
730cdc88 ILT |
223 | Output_section* output_section, |
224 | bool needs_special_offset_handling, | |
2e30d253 | 225 | size_t local_symbol_count, |
730cdc88 | 226 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
227 | |
228 | // Finalize the sections. | |
229 | void | |
f59f41f3 | 230 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 231 | |
4fb6c25d ILT |
232 | // Return the value to use for a dynamic which requires special |
233 | // treatment. | |
234 | uint64_t | |
235 | do_dynsym_value(const Symbol*) const; | |
236 | ||
2e30d253 ILT |
237 | // Relocate a section. |
238 | void | |
239 | relocate_section(const Relocate_info<64, false>*, | |
240 | unsigned int sh_type, | |
241 | const unsigned char* prelocs, | |
242 | size_t reloc_count, | |
730cdc88 ILT |
243 | Output_section* output_section, |
244 | bool needs_special_offset_handling, | |
2e30d253 ILT |
245 | unsigned char* view, |
246 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
247 | section_size_type view_size, |
248 | const Reloc_symbol_changes*); | |
2e30d253 | 249 | |
6a74a719 ILT |
250 | // Scan the relocs during a relocatable link. |
251 | void | |
ad0f2072 | 252 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
253 | Layout* layout, |
254 | Sized_relobj<64, false>* object, | |
255 | unsigned int data_shndx, | |
256 | unsigned int sh_type, | |
257 | const unsigned char* prelocs, | |
258 | size_t reloc_count, | |
259 | Output_section* output_section, | |
260 | bool needs_special_offset_handling, | |
261 | size_t local_symbol_count, | |
262 | const unsigned char* plocal_symbols, | |
263 | Relocatable_relocs*); | |
264 | ||
265 | // Relocate a section during a relocatable link. | |
266 | void | |
267 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
268 | unsigned int sh_type, | |
269 | const unsigned char* prelocs, | |
270 | size_t reloc_count, | |
271 | Output_section* output_section, | |
272 | off_t offset_in_output_section, | |
273 | const Relocatable_relocs*, | |
274 | unsigned char* view, | |
275 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
276 | section_size_type view_size, | |
277 | unsigned char* reloc_view, | |
278 | section_size_type reloc_view_size); | |
279 | ||
2e30d253 ILT |
280 | // Return a string used to fill a code section with nops. |
281 | std::string | |
8851ecca | 282 | do_code_fill(section_size_type length) const; |
2e30d253 | 283 | |
9a2d6984 ILT |
284 | // Return whether SYM is defined by the ABI. |
285 | bool | |
9c2d0ef9 | 286 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
287 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
288 | ||
e291e7b9 ILT |
289 | // Return the symbol index to use for a target specific relocation. |
290 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
291 | // local symbol, which is an absolute reloc. | |
292 | unsigned int | |
293 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
294 | { | |
295 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
296 | return 0; | |
297 | } | |
298 | ||
299 | // Return the addend to use for a target specific relocation. | |
300 | uint64_t | |
301 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
302 | ||
7223e9ca ILT |
303 | // Return the PLT section. |
304 | Output_data* | |
305 | do_plt_section_for_global(const Symbol*) const | |
306 | { return this->plt_section(); } | |
307 | ||
308 | Output_data* | |
309 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
310 | { return this->plt_section(); } | |
311 | ||
364c7fa5 ILT |
312 | // Adjust -fstack-split code which calls non-stack-split code. |
313 | void | |
314 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
315 | section_offset_type fnoffset, section_size_type fnsize, | |
316 | unsigned char* view, section_size_type view_size, | |
317 | std::string* from, std::string* to) const; | |
318 | ||
96f2030e | 319 | // Return the size of the GOT section. |
fe8718a4 | 320 | section_size_type |
0e70b911 | 321 | got_size() const |
96f2030e ILT |
322 | { |
323 | gold_assert(this->got_ != NULL); | |
324 | return this->got_->data_size(); | |
325 | } | |
326 | ||
0e70b911 CC |
327 | // Return the number of entries in the GOT. |
328 | unsigned int | |
329 | got_entry_count() const | |
330 | { | |
331 | if (this->got_ == NULL) | |
332 | return 0; | |
333 | return this->got_size() / 8; | |
334 | } | |
335 | ||
336 | // Return the number of entries in the PLT. | |
337 | unsigned int | |
338 | plt_entry_count() const; | |
339 | ||
340 | // Return the offset of the first non-reserved PLT entry. | |
341 | unsigned int | |
342 | first_plt_entry_offset() const; | |
343 | ||
344 | // Return the size of each PLT entry. | |
345 | unsigned int | |
346 | plt_entry_size() const; | |
347 | ||
e291e7b9 ILT |
348 | // Add a new reloc argument, returning the index in the vector. |
349 | size_t | |
350 | add_tlsdesc_info(Sized_relobj<64, false>* object, unsigned int r_sym) | |
351 | { | |
352 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
353 | return this->tlsdesc_reloc_info_.size() - 1; | |
354 | } | |
355 | ||
2e30d253 ILT |
356 | private: |
357 | // The class which scans relocations. | |
a036edd8 | 358 | class Scan |
2e30d253 | 359 | { |
a036edd8 ILT |
360 | public: |
361 | Scan() | |
362 | : issued_non_pic_error_(false) | |
363 | { } | |
364 | ||
95a2c8d6 RS |
365 | static inline int |
366 | get_reference_flags(unsigned int r_type); | |
367 | ||
2e30d253 | 368 | inline void |
ad0f2072 | 369 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
370 | Sized_relobj<64, false>* object, |
371 | unsigned int data_shndx, | |
07f397ab | 372 | Output_section* output_section, |
2e30d253 ILT |
373 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
374 | const elfcpp::Sym<64, false>& lsym); | |
375 | ||
376 | inline void | |
ad0f2072 | 377 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
378 | Sized_relobj<64, false>* object, |
379 | unsigned int data_shndx, | |
07f397ab | 380 | Output_section* output_section, |
2e30d253 ILT |
381 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
382 | Symbol* gsym); | |
e041f13d | 383 | |
21bb3914 ST |
384 | inline bool |
385 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
386 | Target_x86_64* target, | |
387 | Sized_relobj<64, false>* object, | |
388 | unsigned int data_shndx, | |
389 | Output_section* output_section, | |
390 | const elfcpp::Rela<64, false>& reloc, | |
391 | unsigned int r_type, | |
392 | const elfcpp::Sym<64, false>& lsym); | |
393 | ||
394 | inline bool | |
395 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
396 | Target_x86_64* target, | |
397 | Sized_relobj<64, false>* object, | |
398 | unsigned int data_shndx, | |
399 | Output_section* output_section, | |
400 | const elfcpp::Rela<64, false>& reloc, | |
401 | unsigned int r_type, | |
402 | Symbol* gsym); | |
403 | ||
a036edd8 | 404 | private: |
e041f13d ILT |
405 | static void |
406 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
407 | ||
408 | static void | |
409 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
410 | Symbol*); | |
a036edd8 ILT |
411 | |
412 | void | |
413 | check_non_pic(Relobj*, unsigned int r_type); | |
414 | ||
21bb3914 ST |
415 | inline bool |
416 | possible_function_pointer_reloc(unsigned int r_type); | |
417 | ||
7223e9ca ILT |
418 | bool |
419 | reloc_needs_plt_for_ifunc(Sized_relobj<64, false>*, unsigned int r_type); | |
420 | ||
a036edd8 ILT |
421 | // Whether we have issued an error about a non-PIC compilation. |
422 | bool issued_non_pic_error_; | |
2e30d253 ILT |
423 | }; |
424 | ||
425 | // The class which implements relocation. | |
426 | class Relocate | |
427 | { | |
428 | public: | |
429 | Relocate() | |
36171d64 | 430 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
431 | { } |
432 | ||
433 | ~Relocate() | |
434 | { | |
435 | if (this->skip_call_tls_get_addr_) | |
436 | { | |
437 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 438 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
439 | } |
440 | } | |
441 | ||
442 | // Do a relocation. Return false if the caller should not issue | |
443 | // any warnings about this relocation. | |
444 | inline bool | |
031cdbed ILT |
445 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
446 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
447 | unsigned int r_type, const Sized_symbol<64>*, |
448 | const Symbol_value<64>*, | |
449 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 450 | section_size_type); |
2e30d253 ILT |
451 | |
452 | private: | |
453 | // Do a TLS relocation. | |
454 | inline void | |
7bf1f802 ILT |
455 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
456 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
457 | unsigned int r_type, const Sized_symbol<64>*, |
458 | const Symbol_value<64>*, | |
fe8718a4 ILT |
459 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
460 | section_size_type); | |
2e30d253 | 461 | |
c2b45e22 | 462 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
463 | inline void |
464 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
465 | Output_segment* tls_segment, | |
466 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
467 | elfcpp::Elf_types<64>::Elf_Addr value, | |
468 | unsigned char* view, | |
c2b45e22 | 469 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 470 | section_size_type view_size); |
7bf1f802 | 471 | |
56622147 ILT |
472 | // Do a TLS General-Dynamic to Local-Exec transition. |
473 | inline void | |
474 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
475 | Output_segment* tls_segment, |
476 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
477 | elfcpp::Elf_types<64>::Elf_Addr value, | |
478 | unsigned char* view, | |
fe8718a4 | 479 | section_size_type view_size); |
2e30d253 | 480 | |
c2b45e22 CC |
481 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
482 | inline void | |
483 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
484 | Output_segment* tls_segment, | |
485 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
486 | elfcpp::Elf_types<64>::Elf_Addr value, | |
487 | unsigned char* view, | |
488 | elfcpp::Elf_types<64>::Elf_Addr, | |
489 | section_size_type view_size); | |
490 | ||
491 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
492 | inline void | |
493 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
494 | Output_segment* tls_segment, | |
495 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
496 | elfcpp::Elf_types<64>::Elf_Addr value, | |
497 | unsigned char* view, | |
498 | section_size_type view_size); | |
499 | ||
56622147 | 500 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 501 | inline void |
56622147 | 502 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
503 | Output_segment* tls_segment, |
504 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
505 | elfcpp::Elf_types<64>::Elf_Addr value, | |
506 | unsigned char* view, | |
fe8718a4 | 507 | section_size_type view_size); |
2e30d253 | 508 | |
56622147 ILT |
509 | // Do a TLS Initial-Exec to Local-Exec transition. |
510 | static inline void | |
511 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
512 | Output_segment* tls_segment, |
513 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
514 | elfcpp::Elf_types<64>::Elf_Addr value, | |
515 | unsigned char* view, | |
fe8718a4 | 516 | section_size_type view_size); |
2e30d253 ILT |
517 | |
518 | // This is set if we should skip the next reloc, which should be a | |
519 | // PLT32 reloc against ___tls_get_addr. | |
520 | bool skip_call_tls_get_addr_; | |
521 | }; | |
522 | ||
6a74a719 ILT |
523 | // A class which returns the size required for a relocation type, |
524 | // used while scanning relocs during a relocatable link. | |
525 | class Relocatable_size_for_reloc | |
526 | { | |
527 | public: | |
528 | unsigned int | |
529 | get_size_for_reloc(unsigned int, Relobj*); | |
530 | }; | |
531 | ||
2e30d253 ILT |
532 | // Adjust TLS relocation type based on the options and whether this |
533 | // is a local symbol. | |
e041f13d | 534 | static tls::Tls_optimization |
2e30d253 ILT |
535 | optimize_tls_reloc(bool is_final, int r_type); |
536 | ||
537 | // Get the GOT section, creating it if necessary. | |
538 | Output_data_got<64, false>* | |
539 | got_section(Symbol_table*, Layout*); | |
540 | ||
96f2030e ILT |
541 | // Get the GOT PLT section. |
542 | Output_data_space* | |
543 | got_plt_section() const | |
544 | { | |
545 | gold_assert(this->got_plt_ != NULL); | |
546 | return this->got_plt_; | |
547 | } | |
548 | ||
a8df5856 ILT |
549 | // Get the GOT section for TLSDESC entries. |
550 | Output_data_got<64, false>* | |
551 | got_tlsdesc_section() const | |
552 | { | |
553 | gold_assert(this->got_tlsdesc_ != NULL); | |
554 | return this->got_tlsdesc_; | |
555 | } | |
556 | ||
c2b45e22 CC |
557 | // Create the PLT section. |
558 | void | |
559 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
560 | ||
2e30d253 ILT |
561 | // Create a PLT entry for a global symbol. |
562 | void | |
563 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
564 | ||
7223e9ca ILT |
565 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
566 | void | |
567 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
568 | Sized_relobj<64, false>* relobj, | |
569 | unsigned int local_sym_index); | |
570 | ||
9fa33bee | 571 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
572 | void |
573 | define_tls_base_symbol(Symbol_table*, Layout*); | |
574 | ||
c2b45e22 CC |
575 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
576 | void | |
577 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
578 | ||
31d60480 ILT |
579 | // Create a GOT entry for the TLS module index. |
580 | unsigned int | |
581 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
582 | Sized_relobj<64, false>* object); | |
583 | ||
2e30d253 ILT |
584 | // Get the PLT section. |
585 | Output_data_plt_x86_64* | |
586 | plt_section() const | |
587 | { | |
588 | gold_assert(this->plt_ != NULL); | |
589 | return this->plt_; | |
590 | } | |
591 | ||
592 | // Get the dynamic reloc section, creating it if necessary. | |
593 | Reloc_section* | |
0ffd9845 | 594 | rela_dyn_section(Layout*); |
2e30d253 | 595 | |
e291e7b9 ILT |
596 | // Get the section to use for TLSDESC relocations. |
597 | Reloc_section* | |
598 | rela_tlsdesc_section(Layout*) const; | |
599 | ||
12c0daef | 600 | // Add a potential copy relocation. |
2e30d253 | 601 | void |
ef9beddf ILT |
602 | copy_reloc(Symbol_table* symtab, Layout* layout, |
603 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
604 | unsigned int shndx, Output_section* output_section, |
605 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
606 | { | |
607 | this->copy_relocs_.copy_reloc(symtab, layout, | |
608 | symtab->get_sized_symbol<64>(sym), | |
609 | object, shndx, output_section, | |
610 | reloc, this->rela_dyn_section(layout)); | |
611 | } | |
2e30d253 ILT |
612 | |
613 | // Information about this specific target which we pass to the | |
614 | // general Target structure. | |
615 | static const Target::Target_info x86_64_info; | |
616 | ||
0e70b911 CC |
617 | // The types of GOT entries needed for this platform. |
618 | // These values are exposed to the ABI in an incremental link. | |
619 | // Do not renumber existing values without changing the version | |
620 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
621 | enum Got_type |
622 | { | |
623 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
624 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
625 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
626 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
627 | }; | |
628 | ||
e291e7b9 ILT |
629 | // This type is used as the argument to the target specific |
630 | // relocation routines. The only target specific reloc is | |
631 | // R_X86_64_TLSDESC against a local symbol. | |
632 | struct Tlsdesc_info | |
633 | { | |
634 | Tlsdesc_info(Sized_relobj<64, false>* a_object, unsigned int a_r_sym) | |
635 | : object(a_object), r_sym(a_r_sym) | |
636 | { } | |
637 | ||
638 | // The object in which the local symbol is defined. | |
639 | Sized_relobj<64, false>* object; | |
640 | // The local symbol index in the object. | |
641 | unsigned int r_sym; | |
642 | }; | |
643 | ||
2e30d253 ILT |
644 | // The GOT section. |
645 | Output_data_got<64, false>* got_; | |
646 | // The PLT section. | |
647 | Output_data_plt_x86_64* plt_; | |
648 | // The GOT PLT section. | |
649 | Output_data_space* got_plt_; | |
a8df5856 ILT |
650 | // The GOT section for TLSDESC relocations. |
651 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
652 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
653 | Symbol* global_offset_table_; | |
2e30d253 | 654 | // The dynamic reloc section. |
0ffd9845 | 655 | Reloc_section* rela_dyn_; |
2e30d253 | 656 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 657 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
658 | // Space for variables copied with a COPY reloc. |
659 | Output_data_space* dynbss_; | |
c2b45e22 | 660 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 661 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
662 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
663 | // specific relocation. Here we store the object and local symbol | |
664 | // index for the relocation. | |
665 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
666 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
667 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
668 | }; |
669 | ||
670 | const Target::Target_info Target_x86_64::x86_64_info = | |
671 | { | |
672 | 64, // size | |
673 | false, // is_big_endian | |
674 | elfcpp::EM_X86_64, // machine_code | |
675 | false, // has_make_symbol | |
676 | false, // has_resolve | |
677 | true, // has_code_fill | |
35cdfc9a | 678 | true, // is_default_stack_executable |
0864d551 | 679 | '\0', // wrap_char |
2e30d253 | 680 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 681 | 0x400000, // default_text_segment_address |
cd72c291 | 682 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
683 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
684 | elfcpp::SHN_UNDEF, // small_common_shndx | |
685 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
686 | 0, // small_common_section_flags | |
05a352e6 DK |
687 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
688 | NULL, // attributes_section | |
689 | NULL // attributes_vendor | |
2e30d253 ILT |
690 | }; |
691 | ||
8a5e3e08 ILT |
692 | // This is called when a new output section is created. This is where |
693 | // we handle the SHF_X86_64_LARGE. | |
694 | ||
695 | void | |
ca09d69a | 696 | Target_x86_64::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
697 | { |
698 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
699 | os->set_is_large_section(); | |
700 | } | |
701 | ||
2e30d253 ILT |
702 | // Get the GOT section, creating it if necessary. |
703 | ||
704 | Output_data_got<64, false>* | |
705 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
706 | { | |
707 | if (this->got_ == NULL) | |
708 | { | |
709 | gold_assert(symtab != NULL && layout != NULL); | |
710 | ||
711 | this->got_ = new Output_data_got<64, false>(); | |
712 | ||
82742395 ILT |
713 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
714 | (elfcpp::SHF_ALLOC | |
715 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
716 | this->got_, ORDER_RELRO_LAST, |
717 | true); | |
2e30d253 | 718 | |
7d9e3d98 | 719 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
720 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
721 | (elfcpp::SHF_ALLOC | |
722 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
723 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
724 | false); | |
2e30d253 ILT |
725 | |
726 | // The first three entries are reserved. | |
27bc2bce | 727 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 728 | |
1a2dff53 ILT |
729 | // Those bytes can go into the relro segment. |
730 | layout->increase_relro(3 * 8); | |
731 | ||
2e30d253 | 732 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
733 | this->global_offset_table_ = |
734 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
735 | Symbol_table::PREDEFINED, | |
736 | this->got_plt_, | |
737 | 0, 0, elfcpp::STT_OBJECT, | |
738 | elfcpp::STB_LOCAL, | |
739 | elfcpp::STV_HIDDEN, 0, | |
740 | false, false); | |
a8df5856 ILT |
741 | |
742 | // If there are any TLSDESC relocations, they get GOT entries in | |
743 | // .got.plt after the jump slot entries. | |
744 | this->got_tlsdesc_ = new Output_data_got<64, false>(); | |
745 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
746 | (elfcpp::SHF_ALLOC | |
747 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
748 | this->got_tlsdesc_, |
749 | ORDER_NON_RELRO_FIRST, false); | |
2e30d253 ILT |
750 | } |
751 | ||
752 | return this->got_; | |
753 | } | |
754 | ||
755 | // Get the dynamic reloc section, creating it if necessary. | |
756 | ||
757 | Target_x86_64::Reloc_section* | |
0ffd9845 | 758 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 759 | { |
0ffd9845 | 760 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
761 | { |
762 | gold_assert(layout != NULL); | |
d98bc257 | 763 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 764 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
765 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
766 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 767 | } |
0ffd9845 | 768 | return this->rela_dyn_; |
2e30d253 ILT |
769 | } |
770 | ||
2e30d253 ILT |
771 | // Create the PLT section. The ordinary .got section is an argument, |
772 | // since we need to refer to the start. We also create our own .got | |
773 | // section just for PLT entries. | |
774 | ||
7223e9ca ILT |
775 | Output_data_plt_x86_64::Output_data_plt_x86_64(Symbol_table* symtab, |
776 | Layout* layout, | |
c2b45e22 | 777 | Output_data_got<64, false>* got, |
2e30d253 | 778 | Output_data_space* got_plt) |
e291e7b9 ILT |
779 | : Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), |
780 | count_(0), tlsdesc_got_offset_(-1U) | |
2e30d253 | 781 | { |
d98bc257 | 782 | this->rel_ = new Reloc_section(false); |
2e30d253 | 783 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
784 | elfcpp::SHF_ALLOC, this->rel_, |
785 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
786 | |
787 | if (parameters->doing_static_link()) | |
788 | { | |
789 | // A statically linked executable will only have a .rela.plt | |
790 | // section to hold R_X86_64_IRELATIVE relocs for STT_GNU_IFUNC | |
791 | // symbols. The library will use these symbols to locate the | |
792 | // IRELATIVE relocs at program startup time. | |
793 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
794 | Symbol_table::PREDEFINED, | |
795 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
796 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
797 | 0, false, true); | |
798 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
799 | Symbol_table::PREDEFINED, | |
800 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
801 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
802 | 0, true, true); | |
803 | } | |
2e30d253 ILT |
804 | } |
805 | ||
806 | void | |
807 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
808 | { | |
b0481b0b | 809 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
810 | } |
811 | ||
812 | // Add an entry to the PLT. | |
813 | ||
814 | void | |
815 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
816 | { | |
817 | gold_assert(!gsym->has_plt_offset()); | |
818 | ||
819 | // Note that when setting the PLT offset we skip the initial | |
820 | // reserved PLT entry. | |
821 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
822 | ||
823 | ++this->count_; | |
824 | ||
fe8718a4 | 825 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
826 | |
827 | // Every PLT entry needs a GOT entry which points back to the PLT | |
828 | // entry (this will be changed by the dynamic linker, normally | |
829 | // lazily when the function is called). | |
27bc2bce | 830 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
831 | |
832 | // Every PLT entry needs a reloc. | |
7223e9ca ILT |
833 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
834 | && gsym->can_use_relative_reloc(false)) | |
835 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
836 | this->got_plt_, got_offset, 0); | |
837 | else | |
838 | { | |
839 | gsym->set_needs_dynsym_entry(); | |
840 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
841 | got_offset, 0); | |
842 | } | |
2e30d253 ILT |
843 | |
844 | // Note that we don't need to save the symbol. The contents of the | |
845 | // PLT are independent of which symbols are used. The symbols only | |
846 | // appear in the relocations. | |
847 | } | |
848 | ||
7223e9ca ILT |
849 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
850 | // the PLT offset. | |
851 | ||
852 | unsigned int | |
853 | Output_data_plt_x86_64::add_local_ifunc_entry(Sized_relobj<64, false>* relobj, | |
854 | unsigned int local_sym_index) | |
855 | { | |
856 | unsigned int plt_offset = (this->count_ + 1) * plt_entry_size; | |
857 | ++this->count_; | |
858 | ||
859 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
860 | ||
861 | // Every PLT entry needs a GOT entry which points back to the PLT | |
862 | // entry. | |
863 | this->got_plt_->set_current_data_size(got_offset + 8); | |
864 | ||
865 | // Every PLT entry needs a reloc. | |
866 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, | |
867 | elfcpp::R_X86_64_IRELATIVE, | |
868 | this->got_plt_, got_offset, 0); | |
869 | ||
870 | return plt_offset; | |
871 | } | |
872 | ||
e291e7b9 ILT |
873 | // Return where the TLSDESC relocations should go, creating it if |
874 | // necessary. These follow the JUMP_SLOT relocations. | |
875 | ||
876 | Output_data_plt_x86_64::Reloc_section* | |
877 | Output_data_plt_x86_64::rela_tlsdesc(Layout* layout) | |
878 | { | |
879 | if (this->tlsdesc_rel_ == NULL) | |
880 | { | |
881 | this->tlsdesc_rel_ = new Reloc_section(false); | |
882 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
883 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 884 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
885 | gold_assert(this->tlsdesc_rel_->output_section() == |
886 | this->rel_->output_section()); | |
887 | } | |
888 | return this->tlsdesc_rel_; | |
889 | } | |
890 | ||
c2b45e22 CC |
891 | // Set the final size. |
892 | void | |
893 | Output_data_plt_x86_64::set_final_data_size() | |
894 | { | |
895 | unsigned int count = this->count_; | |
896 | if (this->has_tlsdesc_entry()) | |
897 | ++count; | |
898 | this->set_data_size((count + 1) * plt_entry_size); | |
899 | } | |
900 | ||
2e30d253 ILT |
901 | // The first entry in the PLT for an executable. |
902 | ||
903 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
904 | { | |
905 | // From AMD64 ABI Draft 0.98, page 76 | |
906 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 907 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
908 | 0xff, 0x25, // jmp indirect |
909 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
910 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
911 | }; | |
912 | ||
913 | // Subsequent entries in the PLT for an executable. | |
914 | ||
915 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
916 | { | |
917 | // From AMD64 ABI Draft 0.98, page 76 | |
918 | 0xff, 0x25, // jmpq indirect | |
919 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
920 | 0x68, // pushq immediate | |
921 | 0, 0, 0, 0, // replaced with offset into relocation table | |
922 | 0xe9, // jmpq relative | |
923 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
924 | }; | |
925 | ||
c2b45e22 CC |
926 | // The reserved TLSDESC entry in the PLT for an executable. |
927 | ||
928 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
929 | { | |
930 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
931 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
932 | 0xff, 0x35, // pushq x(%rip) | |
933 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
934 | 0xff, 0x25, // jmpq *y(%rip) | |
935 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
936 | 0x0f, 0x1f, // nop | |
937 | 0x40, 0 | |
938 | }; | |
939 | ||
2e30d253 ILT |
940 | // Write out the PLT. This uses the hand-coded instructions above, |
941 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
942 | ||
943 | void | |
944 | Output_data_plt_x86_64::do_write(Output_file* of) | |
945 | { | |
2ea97941 | 946 | const off_t offset = this->offset(); |
fe8718a4 ILT |
947 | const section_size_type oview_size = |
948 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 949 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
950 | |
951 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
952 | const section_size_type got_size = |
953 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
954 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
955 | got_size); | |
956 | ||
957 | unsigned char* pov = oview; | |
958 | ||
c2b45e22 | 959 | // The base address of the .plt section. |
a984ee1d | 960 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 961 | // The base address of the .got section. |
a984ee1d | 962 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
963 | // The base address of the PLT portion of the .got section, |
964 | // which is where the GOT pointer will point, and where the | |
965 | // three reserved GOT entries are located. | |
a984ee1d | 966 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
967 | |
968 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 969 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
970 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
971 | (got_address + 8 | |
972 | - (plt_address + 6))); | |
973 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
974 | (got_address + 16 | |
975 | - (plt_address + 12))); | |
2e30d253 ILT |
976 | pov += plt_entry_size; |
977 | ||
978 | unsigned char* got_pov = got_view; | |
979 | ||
980 | memset(got_pov, 0, 24); | |
981 | got_pov += 24; | |
982 | ||
983 | unsigned int plt_offset = plt_entry_size; | |
984 | unsigned int got_offset = 24; | |
985 | const unsigned int count = this->count_; | |
986 | for (unsigned int plt_index = 0; | |
987 | plt_index < count; | |
988 | ++plt_index, | |
989 | pov += plt_entry_size, | |
990 | got_pov += 8, | |
991 | plt_offset += plt_entry_size, | |
992 | got_offset += 8) | |
993 | { | |
994 | // Set and adjust the PLT entry itself. | |
995 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
996 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
997 | (got_address + got_offset | |
998 | - (plt_address + plt_offset | |
999 | + 6))); | |
2e30d253 ILT |
1000 | |
1001 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1002 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1003 | - (plt_offset + plt_entry_size)); | |
1004 | ||
1005 | // Set the entry in the GOT. | |
1006 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1007 | } | |
1008 | ||
c2b45e22 CC |
1009 | if (this->has_tlsdesc_entry()) |
1010 | { | |
1011 | // Set and adjust the reserved TLSDESC PLT entry. | |
1012 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
1013 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1014 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1015 | (got_address + 8 | |
1016 | - (plt_address + plt_offset | |
1017 | + 6))); | |
1018 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1019 | (got_base | |
1020 | + tlsdesc_got_offset | |
1021 | - (plt_address + plt_offset | |
1022 | + 12))); | |
1023 | pov += plt_entry_size; | |
1024 | } | |
1025 | ||
fe8718a4 ILT |
1026 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1027 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1028 | |
2ea97941 | 1029 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1030 | of->write_output_view(got_file_offset, got_size, got_view); |
1031 | } | |
1032 | ||
c2b45e22 | 1033 | // Create the PLT section. |
2e30d253 ILT |
1034 | |
1035 | void | |
c2b45e22 | 1036 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1037 | { |
2e30d253 ILT |
1038 | if (this->plt_ == NULL) |
1039 | { | |
1040 | // Create the GOT sections first. | |
1041 | this->got_section(symtab, layout); | |
1042 | ||
7223e9ca | 1043 | this->plt_ = new Output_data_plt_x86_64(symtab, layout, this->got_, |
c2b45e22 | 1044 | this->got_plt_); |
2e30d253 ILT |
1045 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1046 | (elfcpp::SHF_ALLOC | |
1047 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1048 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1049 | |
1050 | // Make the sh_info field of .rela.plt point to .plt. | |
1051 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1052 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1053 | } |
c2b45e22 CC |
1054 | } |
1055 | ||
e291e7b9 ILT |
1056 | // Return the section for TLSDESC relocations. |
1057 | ||
1058 | Target_x86_64::Reloc_section* | |
1059 | Target_x86_64::rela_tlsdesc_section(Layout* layout) const | |
1060 | { | |
1061 | return this->plt_section()->rela_tlsdesc(layout); | |
1062 | } | |
1063 | ||
c2b45e22 CC |
1064 | // Create a PLT entry for a global symbol. |
1065 | ||
1066 | void | |
1067 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
1068 | Symbol* gsym) | |
1069 | { | |
1070 | if (gsym->has_plt_offset()) | |
1071 | return; | |
1072 | ||
1073 | if (this->plt_ == NULL) | |
1074 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
1075 | |
1076 | this->plt_->add_entry(gsym); | |
1077 | } | |
1078 | ||
7223e9ca ILT |
1079 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1080 | ||
1081 | void | |
1082 | Target_x86_64::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
1083 | Sized_relobj<64, false>* relobj, | |
1084 | unsigned int local_sym_index) | |
1085 | { | |
1086 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1087 | return; | |
1088 | if (this->plt_ == NULL) | |
1089 | this->make_plt_section(symtab, layout); | |
1090 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj, | |
1091 | local_sym_index); | |
1092 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1093 | } | |
1094 | ||
0e70b911 CC |
1095 | // Return the number of entries in the PLT. |
1096 | ||
1097 | unsigned int | |
1098 | Target_x86_64::plt_entry_count() const | |
1099 | { | |
1100 | if (this->plt_ == NULL) | |
1101 | return 0; | |
1102 | return this->plt_->entry_count(); | |
1103 | } | |
1104 | ||
1105 | // Return the offset of the first non-reserved PLT entry. | |
1106 | ||
1107 | unsigned int | |
1108 | Target_x86_64::first_plt_entry_offset() const | |
1109 | { | |
1110 | return Output_data_plt_x86_64::first_plt_entry_offset(); | |
1111 | } | |
1112 | ||
1113 | // Return the size of each PLT entry. | |
1114 | ||
1115 | unsigned int | |
1116 | Target_x86_64::plt_entry_size() const | |
1117 | { | |
1118 | return Output_data_plt_x86_64::get_plt_entry_size(); | |
1119 | } | |
1120 | ||
9fa33bee | 1121 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1122 | |
1123 | void | |
1124 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1125 | { | |
1126 | if (this->tls_base_symbol_defined_) | |
1127 | return; | |
1128 | ||
1129 | Output_segment* tls_segment = layout->tls_segment(); | |
1130 | if (tls_segment != NULL) | |
1131 | { | |
183fd0e3 | 1132 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1133 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1134 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1135 | tls_segment, 0, 0, |
1136 | elfcpp::STT_TLS, | |
1137 | elfcpp::STB_LOCAL, | |
1138 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1139 | (is_exec |
1140 | ? Symbol::SEGMENT_END | |
1141 | : Symbol::SEGMENT_START), | |
1142 | true); | |
edfbb029 CC |
1143 | } |
1144 | this->tls_base_symbol_defined_ = true; | |
1145 | } | |
1146 | ||
c2b45e22 CC |
1147 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1148 | ||
1149 | void | |
1150 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
1151 | Layout* layout) | |
1152 | { | |
1153 | if (this->plt_ == NULL) | |
1154 | this->make_plt_section(symtab, layout); | |
1155 | ||
1156 | if (!this->plt_->has_tlsdesc_entry()) | |
1157 | { | |
1158 | // Allocate the TLSDESC_GOT entry. | |
1159 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1160 | unsigned int got_offset = got->add_constant(0); | |
1161 | ||
1162 | // Allocate the TLSDESC_PLT entry. | |
1163 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
1164 | } | |
1165 | } | |
1166 | ||
31d60480 ILT |
1167 | // Create a GOT entry for the TLS module index. |
1168 | ||
1169 | unsigned int | |
1170 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
1171 | Sized_relobj<64, false>* object) | |
1172 | { | |
1173 | if (this->got_mod_index_offset_ == -1U) | |
1174 | { | |
1175 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1176 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1177 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1178 | unsigned int got_offset = got->add_constant(0); | |
1179 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1180 | got_offset, 0); | |
009a67a2 | 1181 | got->add_constant(0); |
31d60480 ILT |
1182 | this->got_mod_index_offset_ = got_offset; |
1183 | } | |
1184 | return this->got_mod_index_offset_; | |
1185 | } | |
1186 | ||
2e30d253 ILT |
1187 | // Optimize the TLS relocation type based on what we know about the |
1188 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1189 | // known at link time. | |
1190 | ||
e041f13d | 1191 | tls::Tls_optimization |
2e30d253 ILT |
1192 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
1193 | { | |
2e30d253 ILT |
1194 | // If we are generating a shared library, then we can't do anything |
1195 | // in the linker. | |
8851ecca | 1196 | if (parameters->options().shared()) |
e041f13d | 1197 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1198 | |
1199 | switch (r_type) | |
1200 | { | |
1201 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1202 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1203 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1204 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1205 | // access. Since we know that we are generating an executable, |
1206 | // we can convert this to Initial-Exec. If we also know that | |
1207 | // this is a local symbol, we can further switch to Local-Exec. | |
1208 | if (is_final) | |
e041f13d ILT |
1209 | return tls::TLSOPT_TO_LE; |
1210 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1211 | |
d61c17ea | 1212 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1213 | // This is Local-Dynamic, which refers to a local symbol in the |
1214 | // dynamic TLS block. Since we know that we generating an | |
1215 | // executable, we can switch to Local-Exec. | |
e041f13d | 1216 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1217 | |
0ffd9845 | 1218 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1219 | case elfcpp::R_X86_64_DTPOFF64: |
1220 | // Another Local-Dynamic reloc. | |
e041f13d | 1221 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1222 | |
d61c17ea | 1223 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1224 | // These are Initial-Exec relocs which get the thread offset |
1225 | // from the GOT. If we know that we are linking against the | |
1226 | // local symbol, we can switch to Local-Exec, which links the | |
1227 | // thread offset into the instruction. | |
1228 | if (is_final) | |
e041f13d ILT |
1229 | return tls::TLSOPT_TO_LE; |
1230 | return tls::TLSOPT_NONE; | |
2e30d253 | 1231 | |
d61c17ea | 1232 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1233 | // When we already have Local-Exec, there is nothing further we |
1234 | // can do. | |
e041f13d | 1235 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1236 | |
1237 | default: | |
1238 | gold_unreachable(); | |
1239 | } | |
2e30d253 ILT |
1240 | } |
1241 | ||
95a2c8d6 RS |
1242 | // Get the Reference_flags for a particular relocation. |
1243 | ||
1244 | int | |
1245 | Target_x86_64::Scan::get_reference_flags(unsigned int r_type) | |
1246 | { | |
1247 | switch (r_type) | |
1248 | { | |
1249 | case elfcpp::R_X86_64_NONE: | |
1250 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
1251 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
1252 | case elfcpp::R_X86_64_GOTPC32: | |
1253 | case elfcpp::R_X86_64_GOTPC64: | |
1254 | // No symbol reference. | |
1255 | return 0; | |
1256 | ||
1257 | case elfcpp::R_X86_64_64: | |
1258 | case elfcpp::R_X86_64_32: | |
1259 | case elfcpp::R_X86_64_32S: | |
1260 | case elfcpp::R_X86_64_16: | |
1261 | case elfcpp::R_X86_64_8: | |
1262 | return Symbol::ABSOLUTE_REF; | |
1263 | ||
1264 | case elfcpp::R_X86_64_PC64: | |
1265 | case elfcpp::R_X86_64_PC32: | |
1266 | case elfcpp::R_X86_64_PC16: | |
1267 | case elfcpp::R_X86_64_PC8: | |
1268 | case elfcpp::R_X86_64_GOTOFF64: | |
1269 | return Symbol::RELATIVE_REF; | |
1270 | ||
1271 | case elfcpp::R_X86_64_PLT32: | |
1272 | case elfcpp::R_X86_64_PLTOFF64: | |
1273 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1274 | ||
1275 | case elfcpp::R_X86_64_GOT64: | |
1276 | case elfcpp::R_X86_64_GOT32: | |
1277 | case elfcpp::R_X86_64_GOTPCREL64: | |
1278 | case elfcpp::R_X86_64_GOTPCREL: | |
1279 | case elfcpp::R_X86_64_GOTPLT64: | |
1280 | // Absolute in GOT. | |
1281 | return Symbol::ABSOLUTE_REF; | |
1282 | ||
1283 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
1284 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
1285 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1286 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
1287 | case elfcpp::R_X86_64_DTPOFF32: | |
1288 | case elfcpp::R_X86_64_DTPOFF64: | |
1289 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
1290 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
1291 | return Symbol::TLS_REF; | |
1292 | ||
1293 | case elfcpp::R_X86_64_COPY: | |
1294 | case elfcpp::R_X86_64_GLOB_DAT: | |
1295 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1296 | case elfcpp::R_X86_64_RELATIVE: | |
1297 | case elfcpp::R_X86_64_IRELATIVE: | |
1298 | case elfcpp::R_X86_64_TPOFF64: | |
1299 | case elfcpp::R_X86_64_DTPMOD64: | |
1300 | case elfcpp::R_X86_64_TLSDESC: | |
1301 | case elfcpp::R_X86_64_SIZE32: | |
1302 | case elfcpp::R_X86_64_SIZE64: | |
1303 | default: | |
1304 | // Not expected. We will give an error later. | |
1305 | return 0; | |
1306 | } | |
1307 | } | |
1308 | ||
e041f13d ILT |
1309 | // Report an unsupported relocation against a local symbol. |
1310 | ||
1311 | void | |
1312 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
1313 | unsigned int r_type) | |
1314 | { | |
75f2446e ILT |
1315 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1316 | object->name().c_str(), r_type); | |
e041f13d ILT |
1317 | } |
1318 | ||
a036edd8 ILT |
1319 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1320 | // dynamic linker does not support it, issue an error. The GNU linker | |
1321 | // only issues a non-PIC error for an allocated read-only section. | |
1322 | // Here we know the section is allocated, but we don't know that it is | |
1323 | // read-only. But we check for all the relocation types which the | |
1324 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
1325 | // error even if the section is not read-only. | |
1326 | ||
1327 | void | |
1328 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
1329 | { | |
1330 | switch (r_type) | |
1331 | { | |
1332 | // These are the relocation types supported by glibc for x86_64. | |
1333 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1334 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
1335 | case elfcpp::R_X86_64_GLOB_DAT: |
1336 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1337 | case elfcpp::R_X86_64_DTPMOD64: | |
1338 | case elfcpp::R_X86_64_DTPOFF64: | |
1339 | case elfcpp::R_X86_64_TPOFF64: | |
1340 | case elfcpp::R_X86_64_64: | |
1341 | case elfcpp::R_X86_64_32: | |
1342 | case elfcpp::R_X86_64_PC32: | |
1343 | case elfcpp::R_X86_64_COPY: | |
1344 | return; | |
1345 | ||
1346 | default: | |
1347 | // This prevents us from issuing more than one error per reloc | |
1348 | // section. But we can still wind up issuing more than one | |
1349 | // error per object file. | |
1350 | if (this->issued_non_pic_error_) | |
1351 | return; | |
33aea2fd | 1352 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
1353 | object->error(_("requires unsupported dynamic reloc; " |
1354 | "recompile with -fPIC")); | |
1355 | this->issued_non_pic_error_ = true; | |
1356 | return; | |
1357 | ||
1358 | case elfcpp::R_X86_64_NONE: | |
1359 | gold_unreachable(); | |
1360 | } | |
1361 | } | |
1362 | ||
7223e9ca ILT |
1363 | // Return whether we need to make a PLT entry for a relocation of the |
1364 | // given type against a STT_GNU_IFUNC symbol. | |
1365 | ||
1366 | bool | |
1367 | Target_x86_64::Scan::reloc_needs_plt_for_ifunc(Sized_relobj<64, false>* object, | |
1368 | unsigned int r_type) | |
1369 | { | |
95a2c8d6 RS |
1370 | int flags = Scan::get_reference_flags(r_type); |
1371 | if (flags & Symbol::TLS_REF) | |
1372 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1373 | object->name().c_str(), r_type); | |
1374 | return flags != 0; | |
7223e9ca ILT |
1375 | } |
1376 | ||
2e30d253 ILT |
1377 | // Scan a relocation for a local symbol. |
1378 | ||
1379 | inline void | |
ad0f2072 | 1380 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1381 | Layout* layout, |
1382 | Target_x86_64* target, | |
1383 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1384 | unsigned int data_shndx, |
4f4c5f80 | 1385 | Output_section* output_section, |
0ffd9845 | 1386 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1387 | unsigned int r_type, |
7bf1f802 | 1388 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 | 1389 | { |
7223e9ca ILT |
1390 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1391 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1392 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1393 | { | |
1394 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
1395 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1396 | } | |
1397 | ||
2e30d253 ILT |
1398 | switch (r_type) |
1399 | { | |
1400 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1401 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1402 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1403 | break; |
1404 | ||
1405 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1406 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1407 | // executable), we need to create a dynamic relocation for this |
1408 | // location. The relocation applied at link time will apply the | |
1409 | // link-time value, so we flag the location with an | |
1410 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1411 | // relocate it easily. |
8851ecca | 1412 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1413 | { |
e8c846c3 | 1414 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1415 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
1416 | rela_dyn->add_local_relative(object, r_sym, |
1417 | elfcpp::R_X86_64_RELATIVE, | |
1418 | output_section, data_shndx, | |
1419 | reloc.get_r_offset(), | |
1420 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1421 | } |
1422 | break; | |
1423 | ||
2e30d253 ILT |
1424 | case elfcpp::R_X86_64_32: |
1425 | case elfcpp::R_X86_64_32S: | |
1426 | case elfcpp::R_X86_64_16: | |
1427 | case elfcpp::R_X86_64_8: | |
96f2030e | 1428 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1429 | // executable), we need to create a dynamic relocation for this |
1430 | // location. We can't use an R_X86_64_RELATIVE relocation | |
1431 | // because that is always a 64-bit relocation. | |
8851ecca | 1432 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1433 | { |
a036edd8 ILT |
1434 | this->check_non_pic(object, r_type); |
1435 | ||
96f2030e | 1436 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1437 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1438 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1439 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1440 | data_shndx, reloc.get_r_offset(), | |
1441 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1442 | else |
1443 | { | |
1444 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1445 | unsigned int shndx = lsym.get_st_shndx(); |
1446 | bool is_ordinary; | |
1447 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1448 | &is_ordinary); | |
1449 | if (!is_ordinary) | |
1450 | object->error(_("section symbol %u has bad shndx %u"), | |
1451 | r_sym, shndx); | |
1452 | else | |
1453 | rela_dyn->add_local_section(object, shndx, | |
1454 | r_type, output_section, | |
1455 | data_shndx, reloc.get_r_offset(), | |
1456 | reloc.get_r_addend()); | |
dceae3c1 | 1457 | } |
96f2030e | 1458 | } |
2e30d253 ILT |
1459 | break; |
1460 | ||
1461 | case elfcpp::R_X86_64_PC64: | |
1462 | case elfcpp::R_X86_64_PC32: | |
1463 | case elfcpp::R_X86_64_PC16: | |
1464 | case elfcpp::R_X86_64_PC8: | |
1465 | break; | |
1466 | ||
f389a824 ILT |
1467 | case elfcpp::R_X86_64_PLT32: |
1468 | // Since we know this is a local symbol, we can handle this as a | |
1469 | // PC32 reloc. | |
1470 | break; | |
1471 | ||
fdc2f80f | 1472 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1473 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1474 | case elfcpp::R_X86_64_GOTPC64: |
1475 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1476 | // We need a GOT section. |
1477 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1478 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1479 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1480 | break; |
1481 | ||
0ffd9845 ILT |
1482 | case elfcpp::R_X86_64_GOT64: |
1483 | case elfcpp::R_X86_64_GOT32: | |
1484 | case elfcpp::R_X86_64_GOTPCREL64: | |
1485 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1486 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1487 | { |
1488 | // The symbol requires a GOT entry. | |
1489 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1490 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
7223e9ca ILT |
1491 | |
1492 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1493 | // lets function pointers compare correctly with shared | |
1494 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1495 | bool is_new; | |
1496 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1497 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1498 | else | |
1499 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1500 | if (is_new) | |
0ffd9845 ILT |
1501 | { |
1502 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1503 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1504 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1505 | { |
1506 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1507 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1508 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
1509 | { |
1510 | unsigned int got_offset = | |
1511 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1512 | rela_dyn->add_local_relative(object, r_sym, | |
1513 | elfcpp::R_X86_64_RELATIVE, | |
1514 | got, got_offset, 0); | |
1515 | } | |
7bf1f802 | 1516 | else |
dceae3c1 | 1517 | { |
a036edd8 ILT |
1518 | this->check_non_pic(object, r_type); |
1519 | ||
dceae3c1 | 1520 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1521 | rela_dyn->add_local( |
1522 | object, r_sym, r_type, got, | |
1523 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1524 | } |
0ffd9845 ILT |
1525 | } |
1526 | } | |
ee9e9e86 ILT |
1527 | // For GOTPLT64, we'd normally want a PLT section, but since |
1528 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1529 | } |
1530 | break; | |
1531 | ||
2e30d253 ILT |
1532 | case elfcpp::R_X86_64_COPY: |
1533 | case elfcpp::R_X86_64_GLOB_DAT: | |
1534 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1535 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1536 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 1537 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1538 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1539 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1540 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1541 | gold_error(_("%s: unexpected reloc %u in object file"), |
1542 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1543 | break; |
1544 | ||
d61c17ea | 1545 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1546 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1547 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1548 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1549 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1550 | case elfcpp::R_X86_64_DTPOFF32: |
1551 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1552 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1553 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1554 | { |
8851ecca | 1555 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1556 | const tls::Tls_optimization optimized_type |
1557 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1558 | switch (r_type) |
1559 | { | |
56622147 | 1560 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1561 | if (optimized_type == tls::TLSOPT_NONE) |
1562 | { | |
1563 | // Create a pair of GOT entries for the module index and | |
1564 | // dtv-relative offset. | |
1565 | Output_data_got<64, false>* got | |
1566 | = target->got_section(symtab, layout); | |
1567 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1568 | unsigned int shndx = lsym.get_st_shndx(); |
1569 | bool is_ordinary; | |
1570 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1571 | if (!is_ordinary) | |
1572 | object->error(_("local symbol %u has bad shndx %u"), | |
1573 | r_sym, shndx); | |
1574 | else | |
1575 | got->add_local_pair_with_rela(object, r_sym, | |
1576 | shndx, | |
1577 | GOT_TYPE_TLS_PAIR, | |
1578 | target->rela_dyn_section(layout), | |
1579 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1580 | } |
1581 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1582 | unsupported_reloc_local(object, r_type); | |
1583 | break; | |
1584 | ||
56622147 | 1585 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1586 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1587 | if (optimized_type == tls::TLSOPT_NONE) |
1588 | { | |
1589 | // Create reserved PLT and GOT entries for the resolver. | |
1590 | target->reserve_tlsdesc_entries(symtab, layout); | |
1591 | ||
a8df5856 ILT |
1592 | // Generate a double GOT entry with an |
1593 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
1594 | // is resolved lazily, so the GOT entry needs to be in | |
1595 | // an area in .got.plt, not .got. Call got_section to | |
1596 | // make sure the section has been created. | |
1597 | target->got_section(symtab, layout); | |
1598 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1599 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
e291e7b9 ILT |
1600 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1601 | { | |
1602 | unsigned int got_offset = got->add_constant(0); | |
1603 | got->add_constant(0); | |
1604 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1605 | got_offset); | |
1606 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
1607 | // We store the arguments we need in a vector, and | |
1608 | // use the index into the vector as the parameter | |
1609 | // to pass to the target specific routines. | |
1610 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
1611 | void* arg = reinterpret_cast<void*>(intarg); | |
1612 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1613 | got, got_offset, 0); | |
1614 | } | |
c2b45e22 CC |
1615 | } |
1616 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1617 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1618 | break; |
1619 | ||
c2b45e22 CC |
1620 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1621 | break; | |
1622 | ||
e041f13d | 1623 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1624 | if (optimized_type == tls::TLSOPT_NONE) |
1625 | { | |
1626 | // Create a GOT entry for the module index. | |
31d60480 | 1627 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1628 | } |
1629 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1630 | unsupported_reloc_local(object, r_type); | |
1631 | break; | |
1632 | ||
0ffd9845 ILT |
1633 | case elfcpp::R_X86_64_DTPOFF32: |
1634 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1635 | break; |
1636 | ||
56622147 | 1637 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1638 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1639 | if (optimized_type == tls::TLSOPT_NONE) |
1640 | { | |
1641 | // Create a GOT entry for the tp-relative offset. | |
1642 | Output_data_got<64, false>* got | |
1643 | = target->got_section(symtab, layout); | |
1644 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1645 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1646 | target->rela_dyn_section(layout), |
1647 | elfcpp::R_X86_64_TPOFF64); | |
1648 | } | |
1649 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1650 | unsupported_reloc_local(object, r_type); |
1651 | break; | |
0ffd9845 | 1652 | |
56622147 | 1653 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1654 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1655 | if (output_is_shared) |
1656 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1657 | break; |
e041f13d ILT |
1658 | |
1659 | default: | |
1660 | gold_unreachable(); | |
2e30d253 ILT |
1661 | } |
1662 | } | |
1663 | break; | |
2e30d253 | 1664 | |
fdc2f80f ILT |
1665 | case elfcpp::R_X86_64_SIZE32: |
1666 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1667 | default: |
75f2446e ILT |
1668 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1669 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1670 | break; |
1671 | } | |
1672 | } | |
1673 | ||
1674 | ||
e041f13d ILT |
1675 | // Report an unsupported relocation against a global symbol. |
1676 | ||
1677 | void | |
1678 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1679 | unsigned int r_type, | |
1680 | Symbol* gsym) | |
1681 | { | |
75f2446e | 1682 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1683 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1684 | } |
1685 | ||
ce97fa81 | 1686 | // Returns true if this relocation type could be that of a function pointer. |
21bb3914 ST |
1687 | inline bool |
1688 | Target_x86_64::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1689 | { | |
21bb3914 ST |
1690 | switch (r_type) |
1691 | { | |
1692 | case elfcpp::R_X86_64_64: | |
1693 | case elfcpp::R_X86_64_32: | |
1694 | case elfcpp::R_X86_64_32S: | |
1695 | case elfcpp::R_X86_64_16: | |
1696 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
1697 | case elfcpp::R_X86_64_GOT64: |
1698 | case elfcpp::R_X86_64_GOT32: | |
1699 | case elfcpp::R_X86_64_GOTPCREL64: | |
1700 | case elfcpp::R_X86_64_GOTPCREL: | |
1701 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
1702 | { |
1703 | return true; | |
1704 | } | |
1705 | } | |
1706 | return false; | |
1707 | } | |
1708 | ||
1709 | // For safe ICF, scan a relocation for a local symbol to check if it | |
1710 | // corresponds to a function pointer being taken. In that case mark | |
1711 | // the function whose pointer was taken as not foldable. | |
1712 | ||
1713 | inline bool | |
1714 | Target_x86_64::Scan::local_reloc_may_be_function_pointer( | |
1715 | Symbol_table* , | |
1716 | Layout* , | |
1717 | Target_x86_64* , | |
1718 | Sized_relobj<64, false>* , | |
1719 | unsigned int , | |
1720 | Output_section* , | |
1721 | const elfcpp::Rela<64, false>& , | |
1722 | unsigned int r_type, | |
1723 | const elfcpp::Sym<64, false>&) | |
1724 | { | |
1725 | // When building a shared library, do not fold any local symbols as it is | |
1726 | // not possible to distinguish pointer taken versus a call by looking at | |
1727 | // the relocation types. | |
1728 | return (parameters->options().shared() | |
1729 | || possible_function_pointer_reloc(r_type)); | |
1730 | } | |
1731 | ||
1732 | // For safe ICF, scan a relocation for a global symbol to check if it | |
1733 | // corresponds to a function pointer being taken. In that case mark | |
1734 | // the function whose pointer was taken as not foldable. | |
1735 | ||
1736 | inline bool | |
1737 | Target_x86_64::Scan::global_reloc_may_be_function_pointer( | |
1738 | Symbol_table*, | |
1739 | Layout* , | |
1740 | Target_x86_64* , | |
1741 | Sized_relobj<64, false>* , | |
1742 | unsigned int , | |
1743 | Output_section* , | |
1744 | const elfcpp::Rela<64, false>& , | |
1745 | unsigned int r_type, | |
1746 | Symbol* gsym) | |
1747 | { | |
1748 | // When building a shared library, do not fold symbols whose visibility | |
1749 | // is hidden, internal or protected. | |
1750 | return ((parameters->options().shared() | |
1751 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
1752 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
1753 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
1754 | || possible_function_pointer_reloc(r_type)); | |
1755 | } | |
1756 | ||
2e30d253 ILT |
1757 | // Scan a relocation for a global symbol. |
1758 | ||
1759 | inline void | |
ad0f2072 | 1760 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1761 | Layout* layout, |
1762 | Target_x86_64* target, | |
1763 | Sized_relobj<64, false>* object, | |
1764 | unsigned int data_shndx, | |
4f4c5f80 | 1765 | Output_section* output_section, |
d61c17ea ILT |
1766 | const elfcpp::Rela<64, false>& reloc, |
1767 | unsigned int r_type, | |
1768 | Symbol* gsym) | |
2e30d253 | 1769 | { |
7223e9ca ILT |
1770 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1771 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1772 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1773 | target->make_plt_entry(symtab, layout, gsym); | |
1774 | ||
2e30d253 ILT |
1775 | switch (r_type) |
1776 | { | |
1777 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1778 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1779 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1780 | break; |
1781 | ||
1782 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1783 | case elfcpp::R_X86_64_32: |
1784 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1785 | case elfcpp::R_X86_64_16: |
2e30d253 | 1786 | case elfcpp::R_X86_64_8: |
96f2030e | 1787 | { |
d61c6bd4 ILT |
1788 | // Make a PLT entry if necessary. |
1789 | if (gsym->needs_plt_entry()) | |
1790 | { | |
1791 | target->make_plt_entry(symtab, layout, gsym); | |
1792 | // Since this is not a PC-relative relocation, we may be | |
1793 | // taking the address of a function. In that case we need to | |
1794 | // set the entry in the dynamic symbol table to the address of | |
1795 | // the PLT entry. | |
8851ecca | 1796 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1797 | gsym->set_needs_dynsym_value(); |
1798 | } | |
1799 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1800 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 1801 | { |
966d4097 | 1802 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1803 | { |
12c0daef | 1804 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1805 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1806 | } |
7223e9ca ILT |
1807 | else if (r_type == elfcpp::R_X86_64_64 |
1808 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1809 | && gsym->can_use_relative_reloc(false) | |
1810 | && !gsym->is_from_dynobj() | |
1811 | && !gsym->is_undefined() | |
1812 | && !gsym->is_preemptible()) | |
1813 | { | |
1814 | // Use an IRELATIVE reloc for a locally defined | |
1815 | // STT_GNU_IFUNC symbol. This makes a function | |
1816 | // address in a PIE executable match the address in a | |
1817 | // shared library that it links against. | |
1818 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1819 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; | |
1820 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
1821 | output_section, object, | |
1822 | data_shndx, | |
1823 | reloc.get_r_offset(), | |
1824 | reloc.get_r_addend()); | |
1825 | } | |
d61c6bd4 ILT |
1826 | else if (r_type == elfcpp::R_X86_64_64 |
1827 | && gsym->can_use_relative_reloc(false)) | |
1828 | { | |
1829 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
1830 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1831 | output_section, object, | |
1832 | data_shndx, | |
1833 | reloc.get_r_offset(), | |
1834 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1835 | } |
1836 | else | |
1837 | { | |
a036edd8 | 1838 | this->check_non_pic(object, r_type); |
96f2030e | 1839 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1840 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1841 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1842 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1843 | } |
1844 | } | |
1845 | } | |
1846 | break; | |
1847 | ||
1848 | case elfcpp::R_X86_64_PC64: | |
1849 | case elfcpp::R_X86_64_PC32: | |
1850 | case elfcpp::R_X86_64_PC16: | |
1851 | case elfcpp::R_X86_64_PC8: | |
1852 | { | |
1853 | // Make a PLT entry if necessary. | |
1854 | if (gsym->needs_plt_entry()) | |
1855 | target->make_plt_entry(symtab, layout, gsym); | |
1856 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 1857 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
86849f1f | 1858 | { |
966d4097 | 1859 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1860 | { |
12c0daef | 1861 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1862 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1863 | } |
86849f1f | 1864 | else |
d61c6bd4 | 1865 | { |
a036edd8 | 1866 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1867 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1868 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1869 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1870 | reloc.get_r_addend()); |
1871 | } | |
86849f1f | 1872 | } |
d61c6bd4 | 1873 | } |
2e30d253 ILT |
1874 | break; |
1875 | ||
ff006520 | 1876 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1877 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1878 | case elfcpp::R_X86_64_GOTPCREL64: |
1879 | case elfcpp::R_X86_64_GOTPCREL: | |
1880 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1881 | { |
1882 | // The symbol requires a GOT entry. | |
1883 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1884 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1885 | { |
1886 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1887 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1888 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1889 | else | |
1890 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1891 | } | |
7bf1f802 ILT |
1892 | else |
1893 | { | |
2e30d253 ILT |
1894 | // If this symbol is not fully resolved, we need to add a |
1895 | // dynamic relocation for it. | |
7bf1f802 | 1896 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
1897 | if (gsym->is_from_dynobj() |
1898 | || gsym->is_undefined() | |
1899 | || gsym->is_preemptible() | |
1900 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1901 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 | 1902 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1903 | elfcpp::R_X86_64_GLOB_DAT); |
1904 | else | |
2e30d253 | 1905 | { |
7223e9ca ILT |
1906 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1907 | // offset into the GOT, so that function pointer | |
1908 | // comparisons work correctly. | |
1909 | bool is_new; | |
1910 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
1911 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
1912 | else | |
1913 | { | |
1914 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1915 | // Tell the dynamic linker to use the PLT address | |
1916 | // when resolving relocations. | |
1917 | if (gsym->is_from_dynobj() | |
1918 | && !parameters->options().shared()) | |
1919 | gsym->set_needs_dynsym_value(); | |
1920 | } | |
1921 | if (is_new) | |
1922 | { | |
1923 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
1924 | rela_dyn->add_global_relative(gsym, | |
1925 | elfcpp::R_X86_64_RELATIVE, | |
1926 | got, got_off, 0); | |
1927 | } | |
2e30d253 ILT |
1928 | } |
1929 | } | |
ee9e9e86 ILT |
1930 | // For GOTPLT64, we also need a PLT entry (but only if the |
1931 | // symbol is not fully resolved). | |
1932 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1933 | && !gsym->final_value_is_known()) | |
1934 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1935 | } |
1936 | break; | |
1937 | ||
1938 | case elfcpp::R_X86_64_PLT32: | |
1939 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1940 | // Otherwise we need a PLT entry. | |
1941 | if (gsym->final_value_is_known()) | |
1942 | break; | |
96f2030e ILT |
1943 | // If building a shared library, we can also skip the PLT entry |
1944 | // if the symbol is defined in the output file and is protected | |
1945 | // or hidden. | |
1946 | if (gsym->is_defined() | |
1947 | && !gsym->is_from_dynobj() | |
1948 | && !gsym->is_preemptible()) | |
1949 | break; | |
2e30d253 ILT |
1950 | target->make_plt_entry(symtab, layout, gsym); |
1951 | break; | |
1952 | ||
fdc2f80f | 1953 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1954 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1955 | case elfcpp::R_X86_64_GOTPC64: |
1956 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1957 | // We need a GOT section. |
1958 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1959 | // For PLTOFF64, we also need a PLT entry (but only if the |
1960 | // symbol is not fully resolved). | |
1961 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1962 | && !gsym->final_value_is_known()) | |
1963 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1964 | break; |
1965 | ||
2e30d253 ILT |
1966 | case elfcpp::R_X86_64_COPY: |
1967 | case elfcpp::R_X86_64_GLOB_DAT: | |
1968 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1969 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1970 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 1971 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1972 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1973 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1974 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1975 | gold_error(_("%s: unexpected reloc %u in object file"), |
1976 | object->name().c_str(), r_type); | |
2e30d253 | 1977 | break; |
2e30d253 | 1978 | |
d61c17ea | 1979 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1980 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1981 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1982 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1983 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1984 | case elfcpp::R_X86_64_DTPOFF32: |
1985 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1986 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1987 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1988 | { |
1989 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1990 | const tls::Tls_optimization optimized_type |
1991 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1992 | switch (r_type) |
1993 | { | |
56622147 | 1994 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1995 | if (optimized_type == tls::TLSOPT_NONE) |
1996 | { | |
1997 | // Create a pair of GOT entries for the module index and | |
1998 | // dtv-relative offset. | |
1999 | Output_data_got<64, false>* got | |
2000 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
2001 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
2002 | target->rela_dyn_section(layout), | |
2003 | elfcpp::R_X86_64_DTPMOD64, | |
2004 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
2005 | } |
2006 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2007 | { | |
2008 | // Create a GOT entry for the tp-relative offset. | |
2009 | Output_data_got<64, false>* got | |
2010 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2011 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
2012 | target->rela_dyn_section(layout), |
2013 | elfcpp::R_X86_64_TPOFF64); | |
2014 | } | |
2015 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2016 | unsupported_reloc_global(object, r_type, gsym); | |
2017 | break; | |
2018 | ||
56622147 | 2019 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 2020 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2021 | if (optimized_type == tls::TLSOPT_NONE) |
2022 | { | |
2023 | // Create reserved PLT and GOT entries for the resolver. | |
2024 | target->reserve_tlsdesc_entries(symtab, layout); | |
2025 | ||
a8df5856 ILT |
2026 | // Create a double GOT entry with an R_X86_64_TLSDESC |
2027 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
2028 | // lazily, so the GOT entry needs to be in an area in | |
2029 | // .got.plt, not .got. Call got_section to make sure | |
2030 | // the section has been created. | |
2031 | target->got_section(symtab, layout); | |
2032 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
ca09d69a | 2033 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
e291e7b9 | 2034 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, rt, |
c2b45e22 CC |
2035 | elfcpp::R_X86_64_TLSDESC, 0); |
2036 | } | |
2037 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2038 | { | |
2039 | // Create a GOT entry for the tp-relative offset. | |
2040 | Output_data_got<64, false>* got | |
2041 | = target->got_section(symtab, layout); | |
2042 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
2043 | target->rela_dyn_section(layout), | |
2044 | elfcpp::R_X86_64_TPOFF64); | |
2045 | } | |
2046 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2047 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
2048 | break; |
2049 | ||
c2b45e22 CC |
2050 | case elfcpp::R_X86_64_TLSDESC_CALL: |
2051 | break; | |
2052 | ||
e041f13d | 2053 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2054 | if (optimized_type == tls::TLSOPT_NONE) |
2055 | { | |
2056 | // Create a GOT entry for the module index. | |
31d60480 | 2057 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
2058 | } |
2059 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2060 | unsupported_reloc_global(object, r_type, gsym); | |
2061 | break; | |
2062 | ||
0ffd9845 ILT |
2063 | case elfcpp::R_X86_64_DTPOFF32: |
2064 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2065 | break; |
2066 | ||
56622147 | 2067 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2068 | layout->set_has_static_tls(); |
7bf1f802 ILT |
2069 | if (optimized_type == tls::TLSOPT_NONE) |
2070 | { | |
2071 | // Create a GOT entry for the tp-relative offset. | |
2072 | Output_data_got<64, false>* got | |
2073 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2074 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
2075 | target->rela_dyn_section(layout), |
2076 | elfcpp::R_X86_64_TPOFF64); | |
2077 | } | |
2078 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
2079 | unsupported_reloc_global(object, r_type, gsym); |
2080 | break; | |
0ffd9845 | 2081 | |
56622147 | 2082 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2083 | layout->set_has_static_tls(); |
8851ecca | 2084 | if (parameters->options().shared()) |
7bf1f802 | 2085 | unsupported_reloc_local(object, r_type); |
2e30d253 | 2086 | break; |
e041f13d ILT |
2087 | |
2088 | default: | |
2089 | gold_unreachable(); | |
2e30d253 ILT |
2090 | } |
2091 | } | |
2092 | break; | |
fdc2f80f ILT |
2093 | |
2094 | case elfcpp::R_X86_64_SIZE32: | |
2095 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2096 | default: |
75f2446e | 2097 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
2098 | object->name().c_str(), r_type, |
2099 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
2100 | break; |
2101 | } | |
2102 | } | |
2103 | ||
6d03d481 | 2104 | void |
ad0f2072 | 2105 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
2106 | Layout* layout, |
2107 | Sized_relobj<64, false>* object, | |
2108 | unsigned int data_shndx, | |
2109 | unsigned int sh_type, | |
2110 | const unsigned char* prelocs, | |
2111 | size_t reloc_count, | |
2112 | Output_section* output_section, | |
2113 | bool needs_special_offset_handling, | |
2114 | size_t local_symbol_count, | |
2115 | const unsigned char* plocal_symbols) | |
2116 | { | |
2117 | ||
2118 | if (sh_type == elfcpp::SHT_REL) | |
2119 | { | |
2120 | return; | |
2121 | } | |
2122 | ||
2123 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
41cbeecc ST |
2124 | Target_x86_64::Scan, |
2125 | Target_x86_64::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2126 | symtab, |
2127 | layout, | |
2128 | this, | |
2129 | object, | |
2130 | data_shndx, | |
2131 | prelocs, | |
2132 | reloc_count, | |
2133 | output_section, | |
2134 | needs_special_offset_handling, | |
2135 | local_symbol_count, | |
2136 | plocal_symbols); | |
2137 | ||
2138 | } | |
2e30d253 ILT |
2139 | // Scan relocations for a section. |
2140 | ||
2141 | void | |
ad0f2072 | 2142 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
2143 | Layout* layout, |
2144 | Sized_relobj<64, false>* object, | |
2145 | unsigned int data_shndx, | |
2146 | unsigned int sh_type, | |
2147 | const unsigned char* prelocs, | |
2148 | size_t reloc_count, | |
730cdc88 ILT |
2149 | Output_section* output_section, |
2150 | bool needs_special_offset_handling, | |
d61c17ea | 2151 | size_t local_symbol_count, |
730cdc88 | 2152 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
2153 | { |
2154 | if (sh_type == elfcpp::SHT_REL) | |
2155 | { | |
75f2446e ILT |
2156 | gold_error(_("%s: unsupported REL reloc section"), |
2157 | object->name().c_str()); | |
2158 | return; | |
2e30d253 ILT |
2159 | } |
2160 | ||
2161 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2162 | Target_x86_64::Scan>( | |
2e30d253 ILT |
2163 | symtab, |
2164 | layout, | |
2165 | this, | |
2166 | object, | |
2167 | data_shndx, | |
2168 | prelocs, | |
2169 | reloc_count, | |
730cdc88 ILT |
2170 | output_section, |
2171 | needs_special_offset_handling, | |
2e30d253 | 2172 | local_symbol_count, |
730cdc88 | 2173 | plocal_symbols); |
2e30d253 ILT |
2174 | } |
2175 | ||
2176 | // Finalize the sections. | |
2177 | ||
2178 | void | |
f59f41f3 DK |
2179 | Target_x86_64::do_finalize_sections( |
2180 | Layout* layout, | |
2181 | const Input_objects*, | |
e785ec03 | 2182 | Symbol_table* symtab) |
2e30d253 | 2183 | { |
ea715a34 ILT |
2184 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2185 | ? NULL | |
e291e7b9 | 2186 | : this->plt_->rela_plt()); |
ea715a34 | 2187 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 2188 | this->rela_dyn_, true, false); |
ea715a34 | 2189 | |
2e30d253 ILT |
2190 | // Fill in some more dynamic tags. |
2191 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
2192 | if (odyn != NULL) | |
2193 | { | |
22b127cc | 2194 | if (this->plt_ != NULL |
ea715a34 ILT |
2195 | && this->plt_->output_section() != NULL |
2196 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 2197 | { |
ea715a34 ILT |
2198 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
2199 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
2200 | this->got_->finalize_data_size(); | |
2201 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
2202 | this->plt_, plt_offset); | |
2203 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
2204 | this->got_, got_offset); | |
2e30d253 ILT |
2205 | } |
2206 | } | |
2207 | ||
2208 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2209 | // relocs. | |
12c0daef ILT |
2210 | if (this->copy_relocs_.any_saved_relocs()) |
2211 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
2212 | |
2213 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2214 | // the .got.plt section. | |
2215 | Symbol* sym = this->global_offset_table_; | |
2216 | if (sym != NULL) | |
2217 | { | |
2218 | uint64_t data_size = this->got_plt_->current_data_size(); | |
2219 | symtab->get_sized_symbol<64>(sym)->set_symsize(data_size); | |
2220 | } | |
2e30d253 ILT |
2221 | } |
2222 | ||
2223 | // Perform a relocation. | |
2224 | ||
2225 | inline bool | |
2226 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
2227 | Target_x86_64* target, | |
031cdbed | 2228 | Output_section*, |
2e30d253 | 2229 | size_t relnum, |
0ffd9845 | 2230 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
2231 | unsigned int r_type, |
2232 | const Sized_symbol<64>* gsym, | |
2233 | const Symbol_value<64>* psymval, | |
2234 | unsigned char* view, | |
2235 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2236 | section_size_type view_size) |
2e30d253 ILT |
2237 | { |
2238 | if (this->skip_call_tls_get_addr_) | |
2239 | { | |
5efc7cd2 CC |
2240 | if ((r_type != elfcpp::R_X86_64_PLT32 |
2241 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 2242 | || gsym == NULL |
0ffd9845 | 2243 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 2244 | { |
75f2446e ILT |
2245 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2246 | _("missing expected TLS relocation")); | |
2247 | } | |
2248 | else | |
2249 | { | |
2250 | this->skip_call_tls_get_addr_ = false; | |
2251 | return false; | |
2e30d253 | 2252 | } |
2e30d253 ILT |
2253 | } |
2254 | ||
7223e9ca ILT |
2255 | const Sized_relobj<64, false>* object = relinfo->object; |
2256 | ||
2257 | // Pick the value to use for symbols defined in the PLT. | |
2e30d253 | 2258 | Symbol_value<64> symval; |
96f2030e | 2259 | if (gsym != NULL |
95a2c8d6 | 2260 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 ILT |
2261 | { |
2262 | symval.set_output_value(target->plt_section()->address() | |
2263 | + gsym->plt_offset()); | |
2264 | psymval = &symval; | |
2265 | } | |
7223e9ca ILT |
2266 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2267 | { | |
2268 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2269 | if (object->local_has_plt_offset(r_sym)) | |
2270 | { | |
2271 | symval.set_output_value(target->plt_section()->address() | |
2272 | + object->local_plt_offset(r_sym)); | |
2273 | psymval = &symval; | |
2274 | } | |
2275 | } | |
2e30d253 | 2276 | |
0ffd9845 ILT |
2277 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2278 | ||
2279 | // Get the GOT offset if needed. | |
96f2030e ILT |
2280 | // The GOT pointer points to the end of the GOT section. |
2281 | // We need to subtract the size of the GOT section to get | |
2282 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
2283 | bool have_got_offset = false; |
2284 | unsigned int got_offset = 0; | |
2285 | switch (r_type) | |
2286 | { | |
2287 | case elfcpp::R_X86_64_GOT32: | |
2288 | case elfcpp::R_X86_64_GOT64: | |
2289 | case elfcpp::R_X86_64_GOTPLT64: | |
2290 | case elfcpp::R_X86_64_GOTPCREL: | |
2291 | case elfcpp::R_X86_64_GOTPCREL64: | |
2292 | if (gsym != NULL) | |
2293 | { | |
0a65a3a7 CC |
2294 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2295 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
2296 | } |
2297 | else | |
2298 | { | |
2299 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2300 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2301 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2302 | - target->got_size()); | |
0ffd9845 ILT |
2303 | } |
2304 | have_got_offset = true; | |
2305 | break; | |
2306 | ||
2307 | default: | |
2308 | break; | |
2309 | } | |
2e30d253 ILT |
2310 | |
2311 | switch (r_type) | |
2312 | { | |
2313 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2314 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2315 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2316 | break; |
2317 | ||
2318 | case elfcpp::R_X86_64_64: | |
2319 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
2320 | break; | |
2321 | ||
2322 | case elfcpp::R_X86_64_PC64: | |
2323 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
2324 | address); | |
2325 | break; | |
2326 | ||
2327 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
2328 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2329 | // uint64_t x = value + addend; | |
2330 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
2331 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
2332 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2333 | break; | |
2334 | ||
2335 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
2336 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2337 | // int64_t x = value + addend; // note this quantity is signed! | |
2338 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
2339 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2340 | break; | |
2341 | ||
2342 | case elfcpp::R_X86_64_PC32: | |
2343 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
2344 | address); | |
2345 | break; | |
2346 | ||
2347 | case elfcpp::R_X86_64_16: | |
2348 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
2349 | break; | |
2350 | ||
2351 | case elfcpp::R_X86_64_PC16: | |
2352 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
2353 | address); | |
2354 | break; | |
2355 | ||
2356 | case elfcpp::R_X86_64_8: | |
2357 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
2358 | break; | |
2359 | ||
2360 | case elfcpp::R_X86_64_PC8: | |
2361 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
2362 | address); | |
2363 | break; | |
2364 | ||
2365 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
2366 | gold_assert(gsym == NULL |
2367 | || gsym->has_plt_offset() | |
99f8faca ILT |
2368 | || gsym->final_value_is_known() |
2369 | || (gsym->is_defined() | |
2370 | && !gsym->is_from_dynobj() | |
2371 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
2372 | // Note: while this code looks the same as for R_X86_64_PC32, it |
2373 | // behaves differently because psymval was set to point to | |
2374 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
2375 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
2376 | address); | |
2377 | break; | |
2378 | ||
ee9e9e86 ILT |
2379 | case elfcpp::R_X86_64_PLTOFF64: |
2380 | { | |
2381 | gold_assert(gsym); | |
2382 | gold_assert(gsym->has_plt_offset() | |
2383 | || gsym->final_value_is_known()); | |
2384 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
2385 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
2386 | Relocate_functions<64, false>::rela64(view, object, psymval, |
2387 | addend - got_address); | |
ee9e9e86 ILT |
2388 | } |
2389 | ||
2e30d253 | 2390 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
2391 | gold_assert(have_got_offset); |
2392 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
2393 | break; |
2394 | ||
e822f2b1 ILT |
2395 | case elfcpp::R_X86_64_GOTPC32: |
2396 | { | |
2397 | gold_assert(gsym); | |
2398 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2399 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2400 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2401 | } | |
2402 | break; | |
2403 | ||
2404 | case elfcpp::R_X86_64_GOT64: | |
2405 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
2406 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 2407 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2408 | gold_assert(have_got_offset); |
2409 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
2410 | break; |
2411 | ||
2412 | case elfcpp::R_X86_64_GOTPC64: | |
2413 | { | |
2414 | gold_assert(gsym); | |
2415 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2416 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2417 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
2418 | } | |
2419 | break; | |
2420 | ||
2e30d253 ILT |
2421 | case elfcpp::R_X86_64_GOTOFF64: |
2422 | { | |
2423 | elfcpp::Elf_types<64>::Elf_Addr value; | |
2424 | value = (psymval->value(object, 0) | |
96f2030e | 2425 | - target->got_plt_section()->address()); |
2e30d253 ILT |
2426 | Relocate_functions<64, false>::rela64(view, value, addend); |
2427 | } | |
2428 | break; | |
2429 | ||
2430 | case elfcpp::R_X86_64_GOTPCREL: | |
2431 | { | |
0ffd9845 ILT |
2432 | gold_assert(have_got_offset); |
2433 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2434 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2435 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
2436 | } |
2437 | break; | |
2438 | ||
e822f2b1 ILT |
2439 | case elfcpp::R_X86_64_GOTPCREL64: |
2440 | { | |
0ffd9845 ILT |
2441 | gold_assert(have_got_offset); |
2442 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2443 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2444 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
2445 | } |
2446 | break; | |
2447 | ||
2e30d253 ILT |
2448 | case elfcpp::R_X86_64_COPY: |
2449 | case elfcpp::R_X86_64_GLOB_DAT: | |
2450 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2451 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2452 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2453 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2454 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2455 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2456 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2457 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2458 | _("unexpected reloc %u in object file"), | |
2459 | r_type); | |
2e30d253 ILT |
2460 | break; |
2461 | ||
d61c17ea | 2462 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2463 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2464 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2465 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2466 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2467 | case elfcpp::R_X86_64_DTPOFF32: |
2468 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2469 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2470 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
2471 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2472 | view, address, view_size); | |
2e30d253 | 2473 | break; |
2e30d253 | 2474 | |
fdc2f80f ILT |
2475 | case elfcpp::R_X86_64_SIZE32: |
2476 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2477 | default: |
75f2446e ILT |
2478 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2479 | _("unsupported reloc %u"), | |
2480 | r_type); | |
2e30d253 ILT |
2481 | break; |
2482 | } | |
2483 | ||
2484 | return true; | |
2485 | } | |
2486 | ||
2487 | // Perform a TLS relocation. | |
2488 | ||
2489 | inline void | |
d61c17ea | 2490 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 2491 | Target_x86_64* target, |
d61c17ea | 2492 | size_t relnum, |
72ec2876 | 2493 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2494 | unsigned int r_type, |
2495 | const Sized_symbol<64>* gsym, | |
2496 | const Symbol_value<64>* psymval, | |
2497 | unsigned char* view, | |
6a41d30b | 2498 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2499 | section_size_type view_size) |
2e30d253 | 2500 | { |
2e30d253 | 2501 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
2502 | |
2503 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 2504 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
36171d64 CC |
2505 | elfcpp::Shdr<64, false> data_shdr(relinfo->data_shdr); |
2506 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; | |
2e30d253 ILT |
2507 | |
2508 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
2509 | ||
2510 | const bool is_final = (gsym == NULL | |
b3705d2a | 2511 | ? !parameters->options().shared() |
2e30d253 | 2512 | : gsym->final_value_is_known()); |
36171d64 | 2513 | tls::Tls_optimization optimized_type |
e041f13d | 2514 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2515 | switch (r_type) |
2516 | { | |
56622147 | 2517 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
2518 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2519 | { | |
2520 | // If this code sequence is used in a non-executable section, | |
2521 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
2522 | // on the assumption that it's being used by itself in a debug | |
2523 | // section. Therefore, in the unlikely event that the code | |
2524 | // sequence appears in a non-executable section, we simply | |
2525 | // leave it unoptimized. | |
2526 | optimized_type = tls::TLSOPT_NONE; | |
2527 | } | |
e041f13d | 2528 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 2529 | { |
7bf1f802 | 2530 | gold_assert(tls_segment != NULL); |
2e30d253 | 2531 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 2532 | rela, r_type, value, view, |
2e30d253 ILT |
2533 | view_size); |
2534 | break; | |
2535 | } | |
7bf1f802 ILT |
2536 | else |
2537 | { | |
c2b45e22 CC |
2538 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2539 | ? GOT_TYPE_TLS_OFFSET | |
2540 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2541 | unsigned int got_offset; |
2542 | if (gsym != NULL) | |
2543 | { | |
c2b45e22 CC |
2544 | gold_assert(gsym->has_got_offset(got_type)); |
2545 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2546 | } |
2547 | else | |
2548 | { | |
2549 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2550 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2551 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2552 | - target->got_size()); |
2553 | } | |
2554 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2555 | { | |
2556 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2557 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2558 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2559 | value, view, address, view_size); |
7bf1f802 ILT |
2560 | break; |
2561 | } | |
2562 | else if (optimized_type == tls::TLSOPT_NONE) | |
2563 | { | |
2564 | // Relocate the field with the offset of the pair of GOT | |
2565 | // entries. | |
6a41d30b ILT |
2566 | value = target->got_plt_section()->address() + got_offset; |
2567 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2568 | address); | |
7bf1f802 ILT |
2569 | break; |
2570 | } | |
2571 | } | |
72ec2876 | 2572 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2573 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2574 | break; |
2575 | ||
c2b45e22 CC |
2576 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2577 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
2578 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2579 | { | |
2580 | // See above comment for R_X86_64_TLSGD. | |
2581 | optimized_type = tls::TLSOPT_NONE; | |
2582 | } | |
c2b45e22 CC |
2583 | if (optimized_type == tls::TLSOPT_TO_LE) |
2584 | { | |
2585 | gold_assert(tls_segment != NULL); | |
2586 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2587 | rela, r_type, value, view, | |
2588 | view_size); | |
2589 | break; | |
2590 | } | |
2591 | else | |
2592 | { | |
2593 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2594 | ? GOT_TYPE_TLS_OFFSET | |
2595 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2596 | unsigned int got_offset = 0; |
2597 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC | |
2598 | && optimized_type == tls::TLSOPT_NONE) | |
2599 | { | |
2600 | // We created GOT entries in the .got.tlsdesc portion of | |
2601 | // the .got.plt section, but the offset stored in the | |
2602 | // symbol is the offset within .got.tlsdesc. | |
2603 | got_offset = (target->got_size() | |
2604 | + target->got_plt_section()->data_size()); | |
2605 | } | |
c2b45e22 CC |
2606 | if (gsym != NULL) |
2607 | { | |
2608 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2609 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2610 | } |
2611 | else | |
2612 | { | |
2613 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2614 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2615 | got_offset += (object->local_got_offset(r_sym, got_type) |
2616 | - target->got_size()); | |
c2b45e22 CC |
2617 | } |
2618 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2619 | { | |
2620 | gold_assert(tls_segment != NULL); | |
2621 | value = target->got_plt_section()->address() + got_offset; | |
2622 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2623 | rela, r_type, value, view, address, | |
2624 | view_size); | |
2625 | break; | |
2626 | } | |
2627 | else if (optimized_type == tls::TLSOPT_NONE) | |
2628 | { | |
2629 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2630 | { | |
2631 | // Relocate the field with the offset of the pair of GOT | |
2632 | // entries. | |
2633 | value = target->got_plt_section()->address() + got_offset; | |
2634 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2635 | address); | |
2636 | } | |
2637 | break; | |
2638 | } | |
2639 | } | |
2640 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2641 | _("unsupported reloc %u"), r_type); | |
2642 | break; | |
2643 | ||
56622147 | 2644 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
2645 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2646 | { | |
2647 | // See above comment for R_X86_64_TLSGD. | |
2648 | optimized_type = tls::TLSOPT_NONE; | |
2649 | } | |
e041f13d ILT |
2650 | if (optimized_type == tls::TLSOPT_TO_LE) |
2651 | { | |
7bf1f802 | 2652 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2653 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2654 | value, view, view_size); | |
2655 | break; | |
e041f13d | 2656 | } |
7bf1f802 ILT |
2657 | else if (optimized_type == tls::TLSOPT_NONE) |
2658 | { | |
2659 | // Relocate the field with the offset of the GOT entry for | |
2660 | // the module index. | |
2661 | unsigned int got_offset; | |
31d60480 ILT |
2662 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2663 | - target->got_size()); | |
6a41d30b ILT |
2664 | value = target->got_plt_section()->address() + got_offset; |
2665 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2666 | address); | |
7bf1f802 ILT |
2667 | break; |
2668 | } | |
72ec2876 | 2669 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2670 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2671 | break; |
0ffd9845 ILT |
2672 | |
2673 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
2674 | // This relocation type is used in debugging information. |
2675 | // In that case we need to not optimize the value. If the | |
2676 | // section is not executable, then we assume we should not | |
2677 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
2678 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
2679 | // R_X86_64_TLSLD. | |
2680 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
2681 | { | |
2682 | gold_assert(tls_segment != NULL); | |
2683 | value -= tls_segment->memsz(); | |
2684 | } | |
d85c80a3 | 2685 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2686 | break; |
2687 | ||
2688 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
2689 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
2690 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
2691 | { | |
2692 | gold_assert(tls_segment != NULL); | |
2693 | value -= tls_segment->memsz(); | |
2694 | } | |
d85c80a3 | 2695 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2696 | break; |
2e30d253 | 2697 | |
56622147 ILT |
2698 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2699 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2700 | { | |
7bf1f802 | 2701 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2702 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2703 | rela, r_type, value, view, | |
2704 | view_size); | |
2705 | break; | |
2706 | } | |
7bf1f802 ILT |
2707 | else if (optimized_type == tls::TLSOPT_NONE) |
2708 | { | |
2709 | // Relocate the field with the offset of the GOT entry for | |
2710 | // the tp-relative offset of the symbol. | |
2711 | unsigned int got_offset; | |
2712 | if (gsym != NULL) | |
2713 | { | |
0a65a3a7 CC |
2714 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2715 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2716 | - target->got_size()); | |
7bf1f802 ILT |
2717 | } |
2718 | else | |
2719 | { | |
2720 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2721 | gold_assert(object->local_has_got_offset(r_sym, |
2722 | GOT_TYPE_TLS_OFFSET)); | |
2723 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2724 | - target->got_size()); |
2725 | } | |
6a41d30b ILT |
2726 | value = target->got_plt_section()->address() + got_offset; |
2727 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2728 | break; |
2729 | } | |
56622147 ILT |
2730 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2731 | _("unsupported reloc type %u"), | |
2732 | r_type); | |
2733 | break; | |
0ffd9845 | 2734 | |
56622147 | 2735 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2736 | value -= tls_segment->memsz(); |
d85c80a3 | 2737 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2738 | break; |
2e30d253 | 2739 | } |
2e30d253 ILT |
2740 | } |
2741 | ||
7bf1f802 ILT |
2742 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2743 | // Initial-Exec. | |
2744 | ||
2745 | inline void | |
2746 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2747 | size_t relnum, | |
c2b45e22 | 2748 | Output_segment*, |
7bf1f802 ILT |
2749 | const elfcpp::Rela<64, false>& rela, |
2750 | unsigned int, | |
2751 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2752 | unsigned char* view, | |
c2b45e22 | 2753 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2754 | section_size_type view_size) |
7bf1f802 ILT |
2755 | { |
2756 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2757 | // .word 0x6666; rex64; call __tls_get_addr | |
2758 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2759 | ||
2760 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2761 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2762 | ||
2763 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2764 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2765 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2766 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2767 | ||
2768 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2769 | ||
c2b45e22 CC |
2770 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2771 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2772 | |
2773 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2774 | // We can skip it. | |
2775 | this->skip_call_tls_get_addr_ = true; | |
2776 | } | |
2777 | ||
e041f13d | 2778 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2779 | // Local-Exec. |
2780 | ||
2781 | inline void | |
d61c17ea ILT |
2782 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2783 | size_t relnum, | |
2784 | Output_segment* tls_segment, | |
72ec2876 | 2785 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2786 | unsigned int, |
2787 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2788 | unsigned char* view, | |
fe8718a4 | 2789 | section_size_type view_size) |
2e30d253 | 2790 | { |
0ffd9845 ILT |
2791 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2792 | // .word 0x6666; rex64; call __tls_get_addr | |
2793 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2794 | |
72ec2876 ILT |
2795 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2796 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2797 | |
72ec2876 ILT |
2798 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2799 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2800 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2801 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2802 | |
0ffd9845 | 2803 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2804 | |
6a41d30b | 2805 | value -= tls_segment->memsz(); |
0ffd9845 | 2806 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2807 | |
2808 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2809 | // We can skip it. | |
2810 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2811 | } |
2812 | ||
c2b45e22 CC |
2813 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2814 | ||
2815 | inline void | |
2816 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2817 | const Relocate_info<64, false>* relinfo, | |
2818 | size_t relnum, | |
2819 | Output_segment*, | |
2820 | const elfcpp::Rela<64, false>& rela, | |
2821 | unsigned int r_type, | |
2822 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2823 | unsigned char* view, | |
2824 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2825 | section_size_type view_size) | |
2826 | { | |
2827 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2828 | { | |
2829 | // leaq foo@tlsdesc(%rip), %rax | |
2830 | // ==> movq foo@gottpoff(%rip), %rax | |
2831 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2832 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2833 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2834 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2835 | view[-2] = 0x8b; | |
2836 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2837 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2838 | } | |
2839 | else | |
2840 | { | |
2841 | // call *foo@tlscall(%rax) | |
2842 | // ==> nop; nop | |
2843 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2844 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2845 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2846 | view[0] == 0xff && view[1] == 0x10); | |
2847 | view[0] = 0x66; | |
2848 | view[1] = 0x90; | |
2849 | } | |
2850 | } | |
2851 | ||
2852 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2853 | ||
2854 | inline void | |
2855 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2856 | const Relocate_info<64, false>* relinfo, | |
2857 | size_t relnum, | |
2858 | Output_segment* tls_segment, | |
2859 | const elfcpp::Rela<64, false>& rela, | |
2860 | unsigned int r_type, | |
2861 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2862 | unsigned char* view, | |
2863 | section_size_type view_size) | |
2864 | { | |
2865 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2866 | { | |
2867 | // leaq foo@tlsdesc(%rip), %rax | |
2868 | // ==> movq foo@tpoff, %rax | |
2869 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2870 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2871 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2872 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2873 | view[-2] = 0xc7; | |
2874 | view[-1] = 0xc0; | |
2875 | value -= tls_segment->memsz(); | |
2876 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2877 | } | |
2878 | else | |
2879 | { | |
2880 | // call *foo@tlscall(%rax) | |
2881 | // ==> nop; nop | |
2882 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2883 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2884 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2885 | view[0] == 0xff && view[1] == 0x10); | |
2886 | view[0] = 0x66; | |
2887 | view[1] = 0x90; | |
2888 | } | |
2889 | } | |
2890 | ||
2e30d253 | 2891 | inline void |
72ec2876 ILT |
2892 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2893 | size_t relnum, | |
2894 | Output_segment*, | |
2895 | const elfcpp::Rela<64, false>& rela, | |
2896 | unsigned int, | |
2897 | elfcpp::Elf_types<64>::Elf_Addr, | |
2898 | unsigned char* view, | |
fe8718a4 | 2899 | section_size_type view_size) |
2e30d253 | 2900 | { |
72ec2876 ILT |
2901 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2902 | // ... leq foo@dtpoff(%rax),%reg | |
2903 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2904 | |
72ec2876 ILT |
2905 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2906 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2907 | |
72ec2876 ILT |
2908 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2909 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2910 | ||
2911 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2912 | ||
2913 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2914 | ||
2915 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2916 | // We can skip it. | |
2917 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2918 | } |
2919 | ||
56622147 ILT |
2920 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2921 | // Local-Exec. | |
2922 | ||
2923 | inline void | |
2924 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2925 | size_t relnum, | |
2926 | Output_segment* tls_segment, | |
2927 | const elfcpp::Rela<64, false>& rela, | |
2928 | unsigned int, | |
2929 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2930 | unsigned char* view, | |
fe8718a4 | 2931 | section_size_type view_size) |
56622147 ILT |
2932 | { |
2933 | // We need to examine the opcodes to figure out which instruction we | |
2934 | // are looking at. | |
2935 | ||
2936 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2937 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2938 | ||
2939 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2940 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2941 | ||
2942 | unsigned char op1 = view[-3]; | |
2943 | unsigned char op2 = view[-2]; | |
2944 | unsigned char op3 = view[-1]; | |
2945 | unsigned char reg = op3 >> 3; | |
2946 | ||
2947 | if (op2 == 0x8b) | |
2948 | { | |
2949 | // movq | |
2950 | if (op1 == 0x4c) | |
2951 | view[-3] = 0x49; | |
2952 | view[-2] = 0xc7; | |
2953 | view[-1] = 0xc0 | reg; | |
2954 | } | |
2955 | else if (reg == 4) | |
2956 | { | |
2957 | // Special handling for %rsp. | |
2958 | if (op1 == 0x4c) | |
2959 | view[-3] = 0x49; | |
2960 | view[-2] = 0x81; | |
2961 | view[-1] = 0xc0 | reg; | |
2962 | } | |
2963 | else | |
2964 | { | |
2965 | // addq | |
2966 | if (op1 == 0x4c) | |
2967 | view[-3] = 0x4d; | |
2968 | view[-2] = 0x8d; | |
2969 | view[-1] = 0x80 | reg | (reg << 3); | |
2970 | } | |
2971 | ||
6a41d30b | 2972 | value -= tls_segment->memsz(); |
56622147 ILT |
2973 | Relocate_functions<64, false>::rela32(view, value, 0); |
2974 | } | |
2975 | ||
2e30d253 ILT |
2976 | // Relocate section data. |
2977 | ||
2978 | void | |
364c7fa5 ILT |
2979 | Target_x86_64::relocate_section( |
2980 | const Relocate_info<64, false>* relinfo, | |
2981 | unsigned int sh_type, | |
2982 | const unsigned char* prelocs, | |
2983 | size_t reloc_count, | |
2984 | Output_section* output_section, | |
2985 | bool needs_special_offset_handling, | |
2986 | unsigned char* view, | |
2987 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2988 | section_size_type view_size, | |
2989 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2990 | { |
2991 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2992 | ||
2993 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2994 | Target_x86_64::Relocate>( | |
2995 | relinfo, | |
2996 | this, | |
2997 | prelocs, | |
2998 | reloc_count, | |
730cdc88 ILT |
2999 | output_section, |
3000 | needs_special_offset_handling, | |
2e30d253 ILT |
3001 | view, |
3002 | address, | |
364c7fa5 ILT |
3003 | view_size, |
3004 | reloc_symbol_changes); | |
2e30d253 ILT |
3005 | } |
3006 | ||
6a74a719 ILT |
3007 | // Return the size of a relocation while scanning during a relocatable |
3008 | // link. | |
3009 | ||
3010 | unsigned int | |
3011 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
3012 | unsigned int r_type, | |
3013 | Relobj* object) | |
3014 | { | |
3015 | switch (r_type) | |
3016 | { | |
3017 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3018 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3019 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
3020 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3021 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
3022 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
3023 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
3024 | case elfcpp::R_X86_64_DTPOFF32: | |
3025 | case elfcpp::R_X86_64_DTPOFF64: | |
3026 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
3027 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
3028 | return 0; | |
3029 | ||
3030 | case elfcpp::R_X86_64_64: | |
3031 | case elfcpp::R_X86_64_PC64: | |
3032 | case elfcpp::R_X86_64_GOTOFF64: | |
3033 | case elfcpp::R_X86_64_GOTPC64: | |
3034 | case elfcpp::R_X86_64_PLTOFF64: | |
3035 | case elfcpp::R_X86_64_GOT64: | |
3036 | case elfcpp::R_X86_64_GOTPCREL64: | |
3037 | case elfcpp::R_X86_64_GOTPCREL: | |
3038 | case elfcpp::R_X86_64_GOTPLT64: | |
3039 | return 8; | |
3040 | ||
3041 | case elfcpp::R_X86_64_32: | |
3042 | case elfcpp::R_X86_64_32S: | |
3043 | case elfcpp::R_X86_64_PC32: | |
3044 | case elfcpp::R_X86_64_PLT32: | |
3045 | case elfcpp::R_X86_64_GOTPC32: | |
3046 | case elfcpp::R_X86_64_GOT32: | |
3047 | return 4; | |
3048 | ||
3049 | case elfcpp::R_X86_64_16: | |
3050 | case elfcpp::R_X86_64_PC16: | |
3051 | return 2; | |
3052 | ||
3053 | case elfcpp::R_X86_64_8: | |
3054 | case elfcpp::R_X86_64_PC8: | |
3055 | return 1; | |
3056 | ||
3057 | case elfcpp::R_X86_64_COPY: | |
3058 | case elfcpp::R_X86_64_GLOB_DAT: | |
3059 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3060 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3061 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
3062 | // These are outstanding tls relocs, which are unexpected when linking |
3063 | case elfcpp::R_X86_64_TPOFF64: | |
3064 | case elfcpp::R_X86_64_DTPMOD64: | |
3065 | case elfcpp::R_X86_64_TLSDESC: | |
3066 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3067 | return 0; | |
3068 | ||
3069 | case elfcpp::R_X86_64_SIZE32: | |
3070 | case elfcpp::R_X86_64_SIZE64: | |
3071 | default: | |
3072 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
3073 | return 0; | |
3074 | } | |
3075 | } | |
3076 | ||
3077 | // Scan the relocs during a relocatable link. | |
3078 | ||
3079 | void | |
ad0f2072 | 3080 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
3081 | Layout* layout, |
3082 | Sized_relobj<64, false>* object, | |
3083 | unsigned int data_shndx, | |
3084 | unsigned int sh_type, | |
3085 | const unsigned char* prelocs, | |
3086 | size_t reloc_count, | |
3087 | Output_section* output_section, | |
3088 | bool needs_special_offset_handling, | |
3089 | size_t local_symbol_count, | |
3090 | const unsigned char* plocal_symbols, | |
3091 | Relocatable_relocs* rr) | |
3092 | { | |
3093 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3094 | ||
3095 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
3096 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3097 | ||
7019cd25 | 3098 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 3099 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3100 | symtab, |
3101 | layout, | |
3102 | object, | |
3103 | data_shndx, | |
3104 | prelocs, | |
3105 | reloc_count, | |
3106 | output_section, | |
3107 | needs_special_offset_handling, | |
3108 | local_symbol_count, | |
3109 | plocal_symbols, | |
3110 | rr); | |
3111 | } | |
3112 | ||
3113 | // Relocate a section during a relocatable link. | |
3114 | ||
3115 | void | |
3116 | Target_x86_64::relocate_for_relocatable( | |
3117 | const Relocate_info<64, false>* relinfo, | |
3118 | unsigned int sh_type, | |
3119 | const unsigned char* prelocs, | |
3120 | size_t reloc_count, | |
3121 | Output_section* output_section, | |
3122 | off_t offset_in_output_section, | |
3123 | const Relocatable_relocs* rr, | |
3124 | unsigned char* view, | |
3125 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
3126 | section_size_type view_size, | |
3127 | unsigned char* reloc_view, | |
3128 | section_size_type reloc_view_size) | |
3129 | { | |
3130 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3131 | ||
7019cd25 | 3132 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
3133 | relinfo, |
3134 | prelocs, | |
3135 | reloc_count, | |
3136 | output_section, | |
3137 | offset_in_output_section, | |
3138 | rr, | |
3139 | view, | |
3140 | view_address, | |
3141 | view_size, | |
3142 | reloc_view, | |
3143 | reloc_view_size); | |
3144 | } | |
3145 | ||
4fb6c25d ILT |
3146 | // Return the value to use for a dynamic which requires special |
3147 | // treatment. This is how we support equality comparisons of function | |
3148 | // pointers across shared library boundaries, as described in the | |
3149 | // processor specific ABI supplement. | |
3150 | ||
3151 | uint64_t | |
3152 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
3153 | { | |
3154 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3155 | return this->plt_section()->address() + gsym->plt_offset(); | |
3156 | } | |
3157 | ||
2e30d253 ILT |
3158 | // Return a string used to fill a code section with nops to take up |
3159 | // the specified length. | |
3160 | ||
3161 | std::string | |
8851ecca | 3162 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
3163 | { |
3164 | if (length >= 16) | |
3165 | { | |
3166 | // Build a jmpq instruction to skip over the bytes. | |
3167 | unsigned char jmp[5]; | |
3168 | jmp[0] = 0xe9; | |
04bf7072 | 3169 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
3170 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
3171 | + std::string(length - 5, '\0')); | |
3172 | } | |
3173 | ||
3174 | // Nop sequences of various lengths. | |
3175 | const char nop1[1] = { 0x90 }; // nop | |
3176 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
3177 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
3178 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
3179 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
3180 | 0x00 }; | |
3181 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 3182 | 0x00, 0x00 }; |
1caf2c51 | 3183 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 3184 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3185 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
3186 | 0x00, 0x00, 0x00, 0x00 }; | |
3187 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
3188 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 3189 | 0x00 }; |
1caf2c51 ILT |
3190 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
3191 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 3192 | 0x00, 0x00 }; |
1caf2c51 ILT |
3193 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
3194 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3195 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3196 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
3197 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3198 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3199 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3200 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
3201 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 3202 | 0x00 }; |
1caf2c51 ILT |
3203 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3204 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
3205 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3206 | 0x00, 0x00 }; |
1caf2c51 ILT |
3207 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3208 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
3209 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
3210 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
3211 | |
3212 | const char* nops[16] = { | |
3213 | NULL, | |
3214 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3215 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3216 | }; | |
3217 | ||
3218 | return std::string(nops[length], length); | |
3219 | } | |
3220 | ||
e291e7b9 ILT |
3221 | // Return the addend to use for a target specific relocation. The |
3222 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
3223 | // symbol. We want to set the addend is the offset of the local | |
3224 | // symbol in the TLS segment. | |
3225 | ||
3226 | uint64_t | |
3227 | Target_x86_64::do_reloc_addend(void* arg, unsigned int r_type, | |
3228 | uint64_t) const | |
3229 | { | |
3230 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
3231 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
3232 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
3233 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
3234 | const Symbol_value<64>* psymval = ti.object->local_symbol(ti.r_sym); | |
3235 | gold_assert(psymval->is_tls_symbol()); | |
3236 | // The value of a TLS symbol is the offset in the TLS segment. | |
3237 | return psymval->value(ti.object, 0); | |
3238 | } | |
3239 | ||
364c7fa5 ILT |
3240 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
3241 | // compiled with -fstack-split. The function calls non-stack-split | |
3242 | // code. We have to change the function so that it always ensures | |
3243 | // that it has enough stack space to run some random function. | |
3244 | ||
3245 | void | |
3246 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3247 | section_offset_type fnoffset, | |
3248 | section_size_type fnsize, | |
3249 | unsigned char* view, | |
3250 | section_size_type view_size, | |
3251 | std::string* from, | |
3252 | std::string* to) const | |
3253 | { | |
3254 | // The function starts with a comparison of the stack pointer and a | |
3255 | // field in the TCB. This is followed by a jump. | |
3256 | ||
3257 | // cmp %fs:NN,%rsp | |
3258 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
3259 | && fnsize > 9) | |
3260 | { | |
3261 | // We will call __morestack if the carry flag is set after this | |
3262 | // comparison. We turn the comparison into an stc instruction | |
3263 | // and some nops. | |
3264 | view[fnoffset] = '\xf9'; | |
3265 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
3266 | } | |
3267 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
3268 | // lea NN(%rsp),%r11 |
3269 | else if ((this->match_view(view, view_size, fnoffset, | |
3270 | "\x4c\x8d\x94\x24", 4) | |
3271 | || this->match_view(view, view_size, fnoffset, | |
3272 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
3273 | && fnsize > 8) |
3274 | { | |
3275 | // This is loading an offset from the stack pointer for a | |
3276 | // comparison. The offset is negative, so we decrease the | |
3277 | // offset by the amount of space we need for the stack. This | |
3278 | // means we will avoid calling __morestack if there happens to | |
3279 | // be plenty of space on the stack already. | |
3280 | unsigned char* pval = view + fnoffset + 4; | |
3281 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3282 | val -= parameters->options().split_stack_adjust_size(); | |
3283 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3284 | } | |
3285 | else | |
3286 | { | |
3287 | if (!object->has_no_split_stack()) | |
3288 | object->error(_("failed to match split-stack sequence at " | |
3289 | "section %u offset %0zx"), | |
ac33a407 | 3290 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3291 | return; |
3292 | } | |
3293 | ||
3294 | // We have to change the function so that it calls | |
3295 | // __morestack_non_split instead of __morestack. The former will | |
3296 | // allocate additional stack space. | |
3297 | *from = "__morestack"; | |
3298 | *to = "__morestack_non_split"; | |
3299 | } | |
3300 | ||
2e30d253 ILT |
3301 | // The selector for x86_64 object files. |
3302 | ||
36959681 | 3303 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
3304 | { |
3305 | public: | |
3306 | Target_selector_x86_64() | |
36959681 ILT |
3307 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
3308 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
3309 | { } |
3310 | ||
3311 | Target* | |
e96caa79 ILT |
3312 | do_instantiate_target() |
3313 | { return new Target_x86_64(); } | |
36959681 | 3314 | |
2e30d253 ILT |
3315 | }; |
3316 | ||
2e30d253 ILT |
3317 | Target_selector_x86_64 target_selector_x86_64; |
3318 | ||
3319 | } // End anonymous namespace. |