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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 | ||
8a5e3e08 ILT |
192 | // Hook for a new output section. |
193 | void | |
194 | do_new_output_section(Output_section*) const; | |
195 | ||
6d03d481 ST |
196 | // Scan the relocations to look for symbol adjustments. |
197 | void | |
ad0f2072 | 198 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
199 | Layout* layout, |
200 | Sized_relobj<64, false>* object, | |
201 | unsigned int data_shndx, | |
202 | unsigned int sh_type, | |
203 | const unsigned char* prelocs, | |
204 | size_t reloc_count, | |
205 | Output_section* output_section, | |
206 | bool needs_special_offset_handling, | |
207 | size_t local_symbol_count, | |
208 | const unsigned char* plocal_symbols); | |
209 | ||
2e30d253 ILT |
210 | // Scan the relocations to look for symbol adjustments. |
211 | void | |
ad0f2072 | 212 | scan_relocs(Symbol_table* symtab, |
2e30d253 ILT |
213 | Layout* layout, |
214 | Sized_relobj<64, false>* object, | |
215 | unsigned int data_shndx, | |
216 | unsigned int sh_type, | |
217 | const unsigned char* prelocs, | |
218 | size_t reloc_count, | |
730cdc88 ILT |
219 | Output_section* output_section, |
220 | bool needs_special_offset_handling, | |
2e30d253 | 221 | size_t local_symbol_count, |
730cdc88 | 222 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
223 | |
224 | // Finalize the sections. | |
225 | void | |
f59f41f3 | 226 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 227 | |
4fb6c25d ILT |
228 | // Return the value to use for a dynamic which requires special |
229 | // treatment. | |
230 | uint64_t | |
231 | do_dynsym_value(const Symbol*) const; | |
232 | ||
2e30d253 ILT |
233 | // Relocate a section. |
234 | void | |
235 | relocate_section(const Relocate_info<64, false>*, | |
236 | unsigned int sh_type, | |
237 | const unsigned char* prelocs, | |
238 | size_t reloc_count, | |
730cdc88 ILT |
239 | Output_section* output_section, |
240 | bool needs_special_offset_handling, | |
2e30d253 ILT |
241 | unsigned char* view, |
242 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
364c7fa5 ILT |
243 | section_size_type view_size, |
244 | const Reloc_symbol_changes*); | |
2e30d253 | 245 | |
6a74a719 ILT |
246 | // Scan the relocs during a relocatable link. |
247 | void | |
ad0f2072 | 248 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
249 | Layout* layout, |
250 | Sized_relobj<64, false>* object, | |
251 | unsigned int data_shndx, | |
252 | unsigned int sh_type, | |
253 | const unsigned char* prelocs, | |
254 | size_t reloc_count, | |
255 | Output_section* output_section, | |
256 | bool needs_special_offset_handling, | |
257 | size_t local_symbol_count, | |
258 | const unsigned char* plocal_symbols, | |
259 | Relocatable_relocs*); | |
260 | ||
261 | // Relocate a section during a relocatable link. | |
262 | void | |
263 | relocate_for_relocatable(const Relocate_info<64, false>*, | |
264 | unsigned int sh_type, | |
265 | const unsigned char* prelocs, | |
266 | size_t reloc_count, | |
267 | Output_section* output_section, | |
268 | off_t offset_in_output_section, | |
269 | const Relocatable_relocs*, | |
270 | unsigned char* view, | |
271 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
272 | section_size_type view_size, | |
273 | unsigned char* reloc_view, | |
274 | section_size_type reloc_view_size); | |
275 | ||
2e30d253 ILT |
276 | // Return a string used to fill a code section with nops. |
277 | std::string | |
8851ecca | 278 | do_code_fill(section_size_type length) const; |
2e30d253 | 279 | |
9a2d6984 ILT |
280 | // Return whether SYM is defined by the ABI. |
281 | bool | |
9c2d0ef9 | 282 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
283 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
284 | ||
e291e7b9 ILT |
285 | // Return the symbol index to use for a target specific relocation. |
286 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
287 | // local symbol, which is an absolute reloc. | |
288 | unsigned int | |
289 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
290 | { | |
291 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
292 | return 0; | |
293 | } | |
294 | ||
295 | // Return the addend to use for a target specific relocation. | |
296 | uint64_t | |
297 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
298 | ||
7223e9ca ILT |
299 | // Return the PLT section. |
300 | Output_data* | |
301 | do_plt_section_for_global(const Symbol*) const | |
302 | { return this->plt_section(); } | |
303 | ||
304 | Output_data* | |
305 | do_plt_section_for_local(const Relobj*, unsigned int) const | |
306 | { return this->plt_section(); } | |
307 | ||
364c7fa5 ILT |
308 | // Adjust -fstack-split code which calls non-stack-split code. |
309 | void | |
310 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
311 | section_offset_type fnoffset, section_size_type fnsize, | |
312 | unsigned char* view, section_size_type view_size, | |
313 | std::string* from, std::string* to) const; | |
314 | ||
96f2030e | 315 | // Return the size of the GOT section. |
fe8718a4 | 316 | section_size_type |
0e70b911 | 317 | got_size() const |
96f2030e ILT |
318 | { |
319 | gold_assert(this->got_ != NULL); | |
320 | return this->got_->data_size(); | |
321 | } | |
322 | ||
0e70b911 CC |
323 | // Return the number of entries in the GOT. |
324 | unsigned int | |
325 | got_entry_count() const | |
326 | { | |
327 | if (this->got_ == NULL) | |
328 | return 0; | |
329 | return this->got_size() / 8; | |
330 | } | |
331 | ||
332 | // Return the number of entries in the PLT. | |
333 | unsigned int | |
334 | plt_entry_count() const; | |
335 | ||
336 | // Return the offset of the first non-reserved PLT entry. | |
337 | unsigned int | |
338 | first_plt_entry_offset() const; | |
339 | ||
340 | // Return the size of each PLT entry. | |
341 | unsigned int | |
342 | plt_entry_size() const; | |
343 | ||
e291e7b9 ILT |
344 | // Add a new reloc argument, returning the index in the vector. |
345 | size_t | |
346 | add_tlsdesc_info(Sized_relobj<64, false>* object, unsigned int r_sym) | |
347 | { | |
348 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
349 | return this->tlsdesc_reloc_info_.size() - 1; | |
350 | } | |
351 | ||
2e30d253 ILT |
352 | private: |
353 | // The class which scans relocations. | |
a036edd8 | 354 | class Scan |
2e30d253 | 355 | { |
a036edd8 ILT |
356 | public: |
357 | Scan() | |
358 | : issued_non_pic_error_(false) | |
359 | { } | |
360 | ||
2e30d253 | 361 | inline void |
ad0f2072 | 362 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
363 | Sized_relobj<64, false>* object, |
364 | unsigned int data_shndx, | |
07f397ab | 365 | Output_section* output_section, |
2e30d253 ILT |
366 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
367 | const elfcpp::Sym<64, false>& lsym); | |
368 | ||
369 | inline void | |
ad0f2072 | 370 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
2e30d253 ILT |
371 | Sized_relobj<64, false>* object, |
372 | unsigned int data_shndx, | |
07f397ab | 373 | Output_section* output_section, |
2e30d253 ILT |
374 | const elfcpp::Rela<64, false>& reloc, unsigned int r_type, |
375 | Symbol* gsym); | |
e041f13d | 376 | |
21bb3914 ST |
377 | inline bool |
378 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
379 | Target_x86_64* target, | |
380 | Sized_relobj<64, false>* object, | |
381 | unsigned int data_shndx, | |
382 | Output_section* output_section, | |
383 | const elfcpp::Rela<64, false>& reloc, | |
384 | unsigned int r_type, | |
385 | const elfcpp::Sym<64, false>& lsym); | |
386 | ||
387 | inline bool | |
388 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
389 | Target_x86_64* target, | |
390 | Sized_relobj<64, false>* object, | |
391 | unsigned int data_shndx, | |
392 | Output_section* output_section, | |
393 | const elfcpp::Rela<64, false>& reloc, | |
394 | unsigned int r_type, | |
395 | Symbol* gsym); | |
396 | ||
a036edd8 | 397 | private: |
e041f13d ILT |
398 | static void |
399 | unsupported_reloc_local(Sized_relobj<64, false>*, unsigned int r_type); | |
400 | ||
401 | static void | |
402 | unsupported_reloc_global(Sized_relobj<64, false>*, unsigned int r_type, | |
403 | Symbol*); | |
a036edd8 ILT |
404 | |
405 | void | |
406 | check_non_pic(Relobj*, unsigned int r_type); | |
407 | ||
21bb3914 ST |
408 | inline bool |
409 | possible_function_pointer_reloc(unsigned int r_type); | |
410 | ||
7223e9ca ILT |
411 | bool |
412 | reloc_needs_plt_for_ifunc(Sized_relobj<64, false>*, unsigned int r_type); | |
413 | ||
a036edd8 ILT |
414 | // Whether we have issued an error about a non-PIC compilation. |
415 | bool issued_non_pic_error_; | |
2e30d253 ILT |
416 | }; |
417 | ||
418 | // The class which implements relocation. | |
419 | class Relocate | |
420 | { | |
421 | public: | |
422 | Relocate() | |
36171d64 | 423 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
424 | { } |
425 | ||
426 | ~Relocate() | |
427 | { | |
428 | if (this->skip_call_tls_get_addr_) | |
429 | { | |
430 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 431 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
432 | } |
433 | } | |
434 | ||
435 | // Do a relocation. Return false if the caller should not issue | |
436 | // any warnings about this relocation. | |
437 | inline bool | |
031cdbed ILT |
438 | relocate(const Relocate_info<64, false>*, Target_x86_64*, Output_section*, |
439 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
440 | unsigned int r_type, const Sized_symbol<64>*, |
441 | const Symbol_value<64>*, | |
442 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, | |
fe8718a4 | 443 | section_size_type); |
2e30d253 ILT |
444 | |
445 | private: | |
446 | // Do a TLS relocation. | |
447 | inline void | |
7bf1f802 ILT |
448 | relocate_tls(const Relocate_info<64, false>*, Target_x86_64*, |
449 | size_t relnum, const elfcpp::Rela<64, false>&, | |
2e30d253 ILT |
450 | unsigned int r_type, const Sized_symbol<64>*, |
451 | const Symbol_value<64>*, | |
fe8718a4 ILT |
452 | unsigned char*, elfcpp::Elf_types<64>::Elf_Addr, |
453 | section_size_type); | |
2e30d253 | 454 | |
c2b45e22 | 455 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 ILT |
456 | inline void |
457 | tls_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
458 | Output_segment* tls_segment, | |
459 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
460 | elfcpp::Elf_types<64>::Elf_Addr value, | |
461 | unsigned char* view, | |
c2b45e22 | 462 | elfcpp::Elf_types<64>::Elf_Addr, |
fe8718a4 | 463 | section_size_type view_size); |
7bf1f802 | 464 | |
56622147 ILT |
465 | // Do a TLS General-Dynamic to Local-Exec transition. |
466 | inline void | |
467 | tls_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
2e30d253 ILT |
468 | Output_segment* tls_segment, |
469 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
470 | elfcpp::Elf_types<64>::Elf_Addr value, | |
471 | unsigned char* view, | |
fe8718a4 | 472 | section_size_type view_size); |
2e30d253 | 473 | |
c2b45e22 CC |
474 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
475 | inline void | |
476 | tls_desc_gd_to_ie(const Relocate_info<64, false>*, size_t relnum, | |
477 | Output_segment* tls_segment, | |
478 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
479 | elfcpp::Elf_types<64>::Elf_Addr value, | |
480 | unsigned char* view, | |
481 | elfcpp::Elf_types<64>::Elf_Addr, | |
482 | section_size_type view_size); | |
483 | ||
484 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
485 | inline void | |
486 | tls_desc_gd_to_le(const Relocate_info<64, false>*, size_t relnum, | |
487 | Output_segment* tls_segment, | |
488 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
489 | elfcpp::Elf_types<64>::Elf_Addr value, | |
490 | unsigned char* view, | |
491 | section_size_type view_size); | |
492 | ||
56622147 | 493 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 494 | inline void |
56622147 | 495 | tls_ld_to_le(const Relocate_info<64, false>*, size_t relnum, |
2e30d253 ILT |
496 | Output_segment* tls_segment, |
497 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
498 | elfcpp::Elf_types<64>::Elf_Addr value, | |
499 | unsigned char* view, | |
fe8718a4 | 500 | section_size_type view_size); |
2e30d253 | 501 | |
56622147 ILT |
502 | // Do a TLS Initial-Exec to Local-Exec transition. |
503 | static inline void | |
504 | tls_ie_to_le(const Relocate_info<64, false>*, size_t relnum, | |
72ec2876 ILT |
505 | Output_segment* tls_segment, |
506 | const elfcpp::Rela<64, false>&, unsigned int r_type, | |
507 | elfcpp::Elf_types<64>::Elf_Addr value, | |
508 | unsigned char* view, | |
fe8718a4 | 509 | section_size_type view_size); |
2e30d253 ILT |
510 | |
511 | // This is set if we should skip the next reloc, which should be a | |
512 | // PLT32 reloc against ___tls_get_addr. | |
513 | bool skip_call_tls_get_addr_; | |
514 | }; | |
515 | ||
6a74a719 ILT |
516 | // A class which returns the size required for a relocation type, |
517 | // used while scanning relocs during a relocatable link. | |
518 | class Relocatable_size_for_reloc | |
519 | { | |
520 | public: | |
521 | unsigned int | |
522 | get_size_for_reloc(unsigned int, Relobj*); | |
523 | }; | |
524 | ||
2e30d253 ILT |
525 | // Adjust TLS relocation type based on the options and whether this |
526 | // is a local symbol. | |
e041f13d | 527 | static tls::Tls_optimization |
2e30d253 ILT |
528 | optimize_tls_reloc(bool is_final, int r_type); |
529 | ||
530 | // Get the GOT section, creating it if necessary. | |
531 | Output_data_got<64, false>* | |
532 | got_section(Symbol_table*, Layout*); | |
533 | ||
96f2030e ILT |
534 | // Get the GOT PLT section. |
535 | Output_data_space* | |
536 | got_plt_section() const | |
537 | { | |
538 | gold_assert(this->got_plt_ != NULL); | |
539 | return this->got_plt_; | |
540 | } | |
541 | ||
a8df5856 ILT |
542 | // Get the GOT section for TLSDESC entries. |
543 | Output_data_got<64, false>* | |
544 | got_tlsdesc_section() const | |
545 | { | |
546 | gold_assert(this->got_tlsdesc_ != NULL); | |
547 | return this->got_tlsdesc_; | |
548 | } | |
549 | ||
c2b45e22 CC |
550 | // Create the PLT section. |
551 | void | |
552 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
553 | ||
2e30d253 ILT |
554 | // Create a PLT entry for a global symbol. |
555 | void | |
556 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
557 | ||
7223e9ca ILT |
558 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
559 | void | |
560 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
561 | Sized_relobj<64, false>* relobj, | |
562 | unsigned int local_sym_index); | |
563 | ||
9fa33bee | 564 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
565 | void |
566 | define_tls_base_symbol(Symbol_table*, Layout*); | |
567 | ||
c2b45e22 CC |
568 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
569 | void | |
570 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
571 | ||
31d60480 ILT |
572 | // Create a GOT entry for the TLS module index. |
573 | unsigned int | |
574 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
575 | Sized_relobj<64, false>* object); | |
576 | ||
2e30d253 ILT |
577 | // Get the PLT section. |
578 | Output_data_plt_x86_64* | |
579 | plt_section() const | |
580 | { | |
581 | gold_assert(this->plt_ != NULL); | |
582 | return this->plt_; | |
583 | } | |
584 | ||
585 | // Get the dynamic reloc section, creating it if necessary. | |
586 | Reloc_section* | |
0ffd9845 | 587 | rela_dyn_section(Layout*); |
2e30d253 | 588 | |
e291e7b9 ILT |
589 | // Get the section to use for TLSDESC relocations. |
590 | Reloc_section* | |
591 | rela_tlsdesc_section(Layout*) const; | |
592 | ||
12c0daef | 593 | // Add a potential copy relocation. |
2e30d253 | 594 | void |
ef9beddf ILT |
595 | copy_reloc(Symbol_table* symtab, Layout* layout, |
596 | Sized_relobj<64, false>* object, | |
12c0daef ILT |
597 | unsigned int shndx, Output_section* output_section, |
598 | Symbol* sym, const elfcpp::Rela<64, false>& reloc) | |
599 | { | |
600 | this->copy_relocs_.copy_reloc(symtab, layout, | |
601 | symtab->get_sized_symbol<64>(sym), | |
602 | object, shndx, output_section, | |
603 | reloc, this->rela_dyn_section(layout)); | |
604 | } | |
2e30d253 ILT |
605 | |
606 | // Information about this specific target which we pass to the | |
607 | // general Target structure. | |
608 | static const Target::Target_info x86_64_info; | |
609 | ||
0e70b911 CC |
610 | // The types of GOT entries needed for this platform. |
611 | // These values are exposed to the ABI in an incremental link. | |
612 | // Do not renumber existing values without changing the version | |
613 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
614 | enum Got_type |
615 | { | |
616 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
617 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
618 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
619 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
620 | }; | |
621 | ||
e291e7b9 ILT |
622 | // This type is used as the argument to the target specific |
623 | // relocation routines. The only target specific reloc is | |
624 | // R_X86_64_TLSDESC against a local symbol. | |
625 | struct Tlsdesc_info | |
626 | { | |
627 | Tlsdesc_info(Sized_relobj<64, false>* a_object, unsigned int a_r_sym) | |
628 | : object(a_object), r_sym(a_r_sym) | |
629 | { } | |
630 | ||
631 | // The object in which the local symbol is defined. | |
632 | Sized_relobj<64, false>* object; | |
633 | // The local symbol index in the object. | |
634 | unsigned int r_sym; | |
635 | }; | |
636 | ||
2e30d253 ILT |
637 | // The GOT section. |
638 | Output_data_got<64, false>* got_; | |
639 | // The PLT section. | |
640 | Output_data_plt_x86_64* plt_; | |
641 | // The GOT PLT section. | |
642 | Output_data_space* got_plt_; | |
a8df5856 ILT |
643 | // The GOT section for TLSDESC relocations. |
644 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
645 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
646 | Symbol* global_offset_table_; | |
2e30d253 | 647 | // The dynamic reloc section. |
0ffd9845 | 648 | Reloc_section* rela_dyn_; |
2e30d253 | 649 | // Relocs saved to avoid a COPY reloc. |
12c0daef | 650 | Copy_relocs<elfcpp::SHT_RELA, 64, false> copy_relocs_; |
2e30d253 ILT |
651 | // Space for variables copied with a COPY reloc. |
652 | Output_data_space* dynbss_; | |
c2b45e22 | 653 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 654 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
655 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
656 | // specific relocation. Here we store the object and local symbol | |
657 | // index for the relocation. | |
658 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
659 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
660 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
661 | }; |
662 | ||
663 | const Target::Target_info Target_x86_64::x86_64_info = | |
664 | { | |
665 | 64, // size | |
666 | false, // is_big_endian | |
667 | elfcpp::EM_X86_64, // machine_code | |
668 | false, // has_make_symbol | |
669 | false, // has_resolve | |
670 | true, // has_code_fill | |
35cdfc9a | 671 | true, // is_default_stack_executable |
0864d551 | 672 | '\0', // wrap_char |
2e30d253 | 673 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 674 | 0x400000, // default_text_segment_address |
cd72c291 | 675 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
676 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
677 | elfcpp::SHN_UNDEF, // small_common_shndx | |
678 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
679 | 0, // small_common_section_flags | |
05a352e6 DK |
680 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
681 | NULL, // attributes_section | |
682 | NULL // attributes_vendor | |
2e30d253 ILT |
683 | }; |
684 | ||
8a5e3e08 ILT |
685 | // This is called when a new output section is created. This is where |
686 | // we handle the SHF_X86_64_LARGE. | |
687 | ||
688 | void | |
ca09d69a | 689 | Target_x86_64::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
690 | { |
691 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
692 | os->set_is_large_section(); | |
693 | } | |
694 | ||
2e30d253 ILT |
695 | // Get the GOT section, creating it if necessary. |
696 | ||
697 | Output_data_got<64, false>* | |
698 | Target_x86_64::got_section(Symbol_table* symtab, Layout* layout) | |
699 | { | |
700 | if (this->got_ == NULL) | |
701 | { | |
702 | gold_assert(symtab != NULL && layout != NULL); | |
703 | ||
704 | this->got_ = new Output_data_got<64, false>(); | |
705 | ||
82742395 ILT |
706 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
707 | (elfcpp::SHF_ALLOC | |
708 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
709 | this->got_, ORDER_RELRO_LAST, |
710 | true); | |
2e30d253 | 711 | |
7d9e3d98 | 712 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
713 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
714 | (elfcpp::SHF_ALLOC | |
715 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
716 | this->got_plt_, ORDER_NON_RELRO_FIRST, |
717 | false); | |
2e30d253 ILT |
718 | |
719 | // The first three entries are reserved. | |
27bc2bce | 720 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 721 | |
1a2dff53 ILT |
722 | // Those bytes can go into the relro segment. |
723 | layout->increase_relro(3 * 8); | |
724 | ||
2e30d253 | 725 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
726 | this->global_offset_table_ = |
727 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
728 | Symbol_table::PREDEFINED, | |
729 | this->got_plt_, | |
730 | 0, 0, elfcpp::STT_OBJECT, | |
731 | elfcpp::STB_LOCAL, | |
732 | elfcpp::STV_HIDDEN, 0, | |
733 | false, false); | |
a8df5856 ILT |
734 | |
735 | // If there are any TLSDESC relocations, they get GOT entries in | |
736 | // .got.plt after the jump slot entries. | |
737 | this->got_tlsdesc_ = new Output_data_got<64, false>(); | |
738 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
739 | (elfcpp::SHF_ALLOC | |
740 | | elfcpp::SHF_WRITE), | |
22f0da72 ILT |
741 | this->got_tlsdesc_, |
742 | ORDER_NON_RELRO_FIRST, false); | |
2e30d253 ILT |
743 | } |
744 | ||
745 | return this->got_; | |
746 | } | |
747 | ||
748 | // Get the dynamic reloc section, creating it if necessary. | |
749 | ||
750 | Target_x86_64::Reloc_section* | |
0ffd9845 | 751 | Target_x86_64::rela_dyn_section(Layout* layout) |
2e30d253 | 752 | { |
0ffd9845 | 753 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
754 | { |
755 | gold_assert(layout != NULL); | |
d98bc257 | 756 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 757 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
758 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
759 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 760 | } |
0ffd9845 | 761 | return this->rela_dyn_; |
2e30d253 ILT |
762 | } |
763 | ||
2e30d253 ILT |
764 | // Create the PLT section. The ordinary .got section is an argument, |
765 | // since we need to refer to the start. We also create our own .got | |
766 | // section just for PLT entries. | |
767 | ||
7223e9ca ILT |
768 | Output_data_plt_x86_64::Output_data_plt_x86_64(Symbol_table* symtab, |
769 | Layout* layout, | |
c2b45e22 | 770 | Output_data_got<64, false>* got, |
2e30d253 | 771 | Output_data_space* got_plt) |
e291e7b9 ILT |
772 | : Output_section_data(8), tlsdesc_rel_(NULL), got_(got), got_plt_(got_plt), |
773 | count_(0), tlsdesc_got_offset_(-1U) | |
2e30d253 | 774 | { |
d98bc257 | 775 | this->rel_ = new Reloc_section(false); |
2e30d253 | 776 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
777 | elfcpp::SHF_ALLOC, this->rel_, |
778 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca ILT |
779 | |
780 | if (parameters->doing_static_link()) | |
781 | { | |
782 | // A statically linked executable will only have a .rela.plt | |
783 | // section to hold R_X86_64_IRELATIVE relocs for STT_GNU_IFUNC | |
784 | // symbols. The library will use these symbols to locate the | |
785 | // IRELATIVE relocs at program startup time. | |
786 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
787 | Symbol_table::PREDEFINED, | |
788 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
789 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
790 | 0, false, true); | |
791 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
792 | Symbol_table::PREDEFINED, | |
793 | this->rel_, 0, 0, elfcpp::STT_NOTYPE, | |
794 | elfcpp::STB_GLOBAL, elfcpp::STV_HIDDEN, | |
795 | 0, true, true); | |
796 | } | |
2e30d253 ILT |
797 | } |
798 | ||
799 | void | |
800 | Output_data_plt_x86_64::do_adjust_output_section(Output_section* os) | |
801 | { | |
b0481b0b | 802 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
803 | } |
804 | ||
805 | // Add an entry to the PLT. | |
806 | ||
807 | void | |
808 | Output_data_plt_x86_64::add_entry(Symbol* gsym) | |
809 | { | |
810 | gold_assert(!gsym->has_plt_offset()); | |
811 | ||
812 | // Note that when setting the PLT offset we skip the initial | |
813 | // reserved PLT entry. | |
814 | gsym->set_plt_offset((this->count_ + 1) * plt_entry_size); | |
815 | ||
816 | ++this->count_; | |
817 | ||
fe8718a4 | 818 | section_offset_type got_offset = this->got_plt_->current_data_size(); |
2e30d253 ILT |
819 | |
820 | // Every PLT entry needs a GOT entry which points back to the PLT | |
821 | // entry (this will be changed by the dynamic linker, normally | |
822 | // lazily when the function is called). | |
27bc2bce | 823 | this->got_plt_->set_current_data_size(got_offset + 8); |
2e30d253 ILT |
824 | |
825 | // Every PLT entry needs a reloc. | |
7223e9ca ILT |
826 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
827 | && gsym->can_use_relative_reloc(false)) | |
828 | this->rel_->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
829 | this->got_plt_, got_offset, 0); | |
830 | else | |
831 | { | |
832 | gsym->set_needs_dynsym_entry(); | |
833 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
834 | got_offset, 0); | |
835 | } | |
2e30d253 ILT |
836 | |
837 | // Note that we don't need to save the symbol. The contents of the | |
838 | // PLT are independent of which symbols are used. The symbols only | |
839 | // appear in the relocations. | |
840 | } | |
841 | ||
7223e9ca ILT |
842 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
843 | // the PLT offset. | |
844 | ||
845 | unsigned int | |
846 | Output_data_plt_x86_64::add_local_ifunc_entry(Sized_relobj<64, false>* relobj, | |
847 | unsigned int local_sym_index) | |
848 | { | |
849 | unsigned int plt_offset = (this->count_ + 1) * plt_entry_size; | |
850 | ++this->count_; | |
851 | ||
852 | section_offset_type got_offset = this->got_plt_->current_data_size(); | |
853 | ||
854 | // Every PLT entry needs a GOT entry which points back to the PLT | |
855 | // entry. | |
856 | this->got_plt_->set_current_data_size(got_offset + 8); | |
857 | ||
858 | // Every PLT entry needs a reloc. | |
859 | this->rel_->add_symbolless_local_addend(relobj, local_sym_index, | |
860 | elfcpp::R_X86_64_IRELATIVE, | |
861 | this->got_plt_, got_offset, 0); | |
862 | ||
863 | return plt_offset; | |
864 | } | |
865 | ||
e291e7b9 ILT |
866 | // Return where the TLSDESC relocations should go, creating it if |
867 | // necessary. These follow the JUMP_SLOT relocations. | |
868 | ||
869 | Output_data_plt_x86_64::Reloc_section* | |
870 | Output_data_plt_x86_64::rela_tlsdesc(Layout* layout) | |
871 | { | |
872 | if (this->tlsdesc_rel_ == NULL) | |
873 | { | |
874 | this->tlsdesc_rel_ = new Reloc_section(false); | |
875 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
876 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 877 | ORDER_DYNAMIC_PLT_RELOCS, false); |
e291e7b9 ILT |
878 | gold_assert(this->tlsdesc_rel_->output_section() == |
879 | this->rel_->output_section()); | |
880 | } | |
881 | return this->tlsdesc_rel_; | |
882 | } | |
883 | ||
c2b45e22 CC |
884 | // Set the final size. |
885 | void | |
886 | Output_data_plt_x86_64::set_final_data_size() | |
887 | { | |
888 | unsigned int count = this->count_; | |
889 | if (this->has_tlsdesc_entry()) | |
890 | ++count; | |
891 | this->set_data_size((count + 1) * plt_entry_size); | |
892 | } | |
893 | ||
2e30d253 ILT |
894 | // The first entry in the PLT for an executable. |
895 | ||
896 | unsigned char Output_data_plt_x86_64::first_plt_entry[plt_entry_size] = | |
897 | { | |
898 | // From AMD64 ABI Draft 0.98, page 76 | |
899 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 900 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
901 | 0xff, 0x25, // jmp indirect |
902 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
903 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
904 | }; | |
905 | ||
906 | // Subsequent entries in the PLT for an executable. | |
907 | ||
908 | unsigned char Output_data_plt_x86_64::plt_entry[plt_entry_size] = | |
909 | { | |
910 | // From AMD64 ABI Draft 0.98, page 76 | |
911 | 0xff, 0x25, // jmpq indirect | |
912 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
913 | 0x68, // pushq immediate | |
914 | 0, 0, 0, 0, // replaced with offset into relocation table | |
915 | 0xe9, // jmpq relative | |
916 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
917 | }; | |
918 | ||
c2b45e22 CC |
919 | // The reserved TLSDESC entry in the PLT for an executable. |
920 | ||
921 | unsigned char Output_data_plt_x86_64::tlsdesc_plt_entry[plt_entry_size] = | |
922 | { | |
923 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
924 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
925 | 0xff, 0x35, // pushq x(%rip) | |
926 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
927 | 0xff, 0x25, // jmpq *y(%rip) | |
928 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
929 | 0x0f, 0x1f, // nop | |
930 | 0x40, 0 | |
931 | }; | |
932 | ||
2e30d253 ILT |
933 | // Write out the PLT. This uses the hand-coded instructions above, |
934 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
935 | ||
936 | void | |
937 | Output_data_plt_x86_64::do_write(Output_file* of) | |
938 | { | |
2ea97941 | 939 | const off_t offset = this->offset(); |
fe8718a4 ILT |
940 | const section_size_type oview_size = |
941 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 942 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
943 | |
944 | const off_t got_file_offset = this->got_plt_->offset(); | |
fe8718a4 ILT |
945 | const section_size_type got_size = |
946 | convert_to_section_size_type(this->got_plt_->data_size()); | |
2e30d253 ILT |
947 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
948 | got_size); | |
949 | ||
950 | unsigned char* pov = oview; | |
951 | ||
c2b45e22 | 952 | // The base address of the .plt section. |
a984ee1d | 953 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 954 | // The base address of the .got section. |
a984ee1d | 955 | elfcpp::Elf_types<64>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
956 | // The base address of the PLT portion of the .got section, |
957 | // which is where the GOT pointer will point, and where the | |
958 | // three reserved GOT entries are located. | |
a984ee1d | 959 | elfcpp::Elf_types<64>::Elf_Addr got_address = this->got_plt_->address(); |
2e30d253 ILT |
960 | |
961 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 962 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
963 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
964 | (got_address + 8 | |
965 | - (plt_address + 6))); | |
966 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
967 | (got_address + 16 | |
968 | - (plt_address + 12))); | |
2e30d253 ILT |
969 | pov += plt_entry_size; |
970 | ||
971 | unsigned char* got_pov = got_view; | |
972 | ||
973 | memset(got_pov, 0, 24); | |
974 | got_pov += 24; | |
975 | ||
976 | unsigned int plt_offset = plt_entry_size; | |
977 | unsigned int got_offset = 24; | |
978 | const unsigned int count = this->count_; | |
979 | for (unsigned int plt_index = 0; | |
980 | plt_index < count; | |
981 | ++plt_index, | |
982 | pov += plt_entry_size, | |
983 | got_pov += 8, | |
984 | plt_offset += plt_entry_size, | |
985 | got_offset += 8) | |
986 | { | |
987 | // Set and adjust the PLT entry itself. | |
988 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
989 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
990 | (got_address + got_offset | |
991 | - (plt_address + plt_offset | |
992 | + 6))); | |
2e30d253 ILT |
993 | |
994 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
995 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
996 | - (plt_offset + plt_entry_size)); | |
997 | ||
998 | // Set the entry in the GOT. | |
999 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1000 | } | |
1001 | ||
c2b45e22 CC |
1002 | if (this->has_tlsdesc_entry()) |
1003 | { | |
1004 | // Set and adjust the reserved TLSDESC PLT entry. | |
1005 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
1006 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1007 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1008 | (got_address + 8 | |
1009 | - (plt_address + plt_offset | |
1010 | + 6))); | |
1011 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1012 | (got_base | |
1013 | + tlsdesc_got_offset | |
1014 | - (plt_address + plt_offset | |
1015 | + 12))); | |
1016 | pov += plt_entry_size; | |
1017 | } | |
1018 | ||
fe8718a4 ILT |
1019 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1020 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1021 | |
2ea97941 | 1022 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1023 | of->write_output_view(got_file_offset, got_size, got_view); |
1024 | } | |
1025 | ||
c2b45e22 | 1026 | // Create the PLT section. |
2e30d253 ILT |
1027 | |
1028 | void | |
c2b45e22 | 1029 | Target_x86_64::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1030 | { |
2e30d253 ILT |
1031 | if (this->plt_ == NULL) |
1032 | { | |
1033 | // Create the GOT sections first. | |
1034 | this->got_section(symtab, layout); | |
1035 | ||
7223e9ca | 1036 | this->plt_ = new Output_data_plt_x86_64(symtab, layout, this->got_, |
c2b45e22 | 1037 | this->got_plt_); |
2e30d253 ILT |
1038 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1039 | (elfcpp::SHF_ALLOC | |
1040 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1041 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1042 | |
1043 | // Make the sh_info field of .rela.plt point to .plt. | |
1044 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1045 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1046 | } |
c2b45e22 CC |
1047 | } |
1048 | ||
e291e7b9 ILT |
1049 | // Return the section for TLSDESC relocations. |
1050 | ||
1051 | Target_x86_64::Reloc_section* | |
1052 | Target_x86_64::rela_tlsdesc_section(Layout* layout) const | |
1053 | { | |
1054 | return this->plt_section()->rela_tlsdesc(layout); | |
1055 | } | |
1056 | ||
c2b45e22 CC |
1057 | // Create a PLT entry for a global symbol. |
1058 | ||
1059 | void | |
1060 | Target_x86_64::make_plt_entry(Symbol_table* symtab, Layout* layout, | |
1061 | Symbol* gsym) | |
1062 | { | |
1063 | if (gsym->has_plt_offset()) | |
1064 | return; | |
1065 | ||
1066 | if (this->plt_ == NULL) | |
1067 | this->make_plt_section(symtab, layout); | |
2e30d253 ILT |
1068 | |
1069 | this->plt_->add_entry(gsym); | |
1070 | } | |
1071 | ||
7223e9ca ILT |
1072 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1073 | ||
1074 | void | |
1075 | Target_x86_64::make_local_ifunc_plt_entry(Symbol_table* symtab, Layout* layout, | |
1076 | Sized_relobj<64, false>* relobj, | |
1077 | unsigned int local_sym_index) | |
1078 | { | |
1079 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1080 | return; | |
1081 | if (this->plt_ == NULL) | |
1082 | this->make_plt_section(symtab, layout); | |
1083 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(relobj, | |
1084 | local_sym_index); | |
1085 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1086 | } | |
1087 | ||
0e70b911 CC |
1088 | // Return the number of entries in the PLT. |
1089 | ||
1090 | unsigned int | |
1091 | Target_x86_64::plt_entry_count() const | |
1092 | { | |
1093 | if (this->plt_ == NULL) | |
1094 | return 0; | |
1095 | return this->plt_->entry_count(); | |
1096 | } | |
1097 | ||
1098 | // Return the offset of the first non-reserved PLT entry. | |
1099 | ||
1100 | unsigned int | |
1101 | Target_x86_64::first_plt_entry_offset() const | |
1102 | { | |
1103 | return Output_data_plt_x86_64::first_plt_entry_offset(); | |
1104 | } | |
1105 | ||
1106 | // Return the size of each PLT entry. | |
1107 | ||
1108 | unsigned int | |
1109 | Target_x86_64::plt_entry_size() const | |
1110 | { | |
1111 | return Output_data_plt_x86_64::get_plt_entry_size(); | |
1112 | } | |
1113 | ||
9fa33bee | 1114 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1115 | |
1116 | void | |
1117 | Target_x86_64::define_tls_base_symbol(Symbol_table* symtab, Layout* layout) | |
1118 | { | |
1119 | if (this->tls_base_symbol_defined_) | |
1120 | return; | |
1121 | ||
1122 | Output_segment* tls_segment = layout->tls_segment(); | |
1123 | if (tls_segment != NULL) | |
1124 | { | |
183fd0e3 | 1125 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1126 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1127 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1128 | tls_segment, 0, 0, |
1129 | elfcpp::STT_TLS, | |
1130 | elfcpp::STB_LOCAL, | |
1131 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1132 | (is_exec |
1133 | ? Symbol::SEGMENT_END | |
1134 | : Symbol::SEGMENT_START), | |
1135 | true); | |
edfbb029 CC |
1136 | } |
1137 | this->tls_base_symbol_defined_ = true; | |
1138 | } | |
1139 | ||
c2b45e22 CC |
1140 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1141 | ||
1142 | void | |
1143 | Target_x86_64::reserve_tlsdesc_entries(Symbol_table* symtab, | |
1144 | Layout* layout) | |
1145 | { | |
1146 | if (this->plt_ == NULL) | |
1147 | this->make_plt_section(symtab, layout); | |
1148 | ||
1149 | if (!this->plt_->has_tlsdesc_entry()) | |
1150 | { | |
1151 | // Allocate the TLSDESC_GOT entry. | |
1152 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1153 | unsigned int got_offset = got->add_constant(0); | |
1154 | ||
1155 | // Allocate the TLSDESC_PLT entry. | |
1156 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
1157 | } | |
1158 | } | |
1159 | ||
31d60480 ILT |
1160 | // Create a GOT entry for the TLS module index. |
1161 | ||
1162 | unsigned int | |
1163 | Target_x86_64::got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
1164 | Sized_relobj<64, false>* object) | |
1165 | { | |
1166 | if (this->got_mod_index_offset_ == -1U) | |
1167 | { | |
1168 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1169 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1170 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1171 | unsigned int got_offset = got->add_constant(0); | |
1172 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1173 | got_offset, 0); | |
009a67a2 | 1174 | got->add_constant(0); |
31d60480 ILT |
1175 | this->got_mod_index_offset_ = got_offset; |
1176 | } | |
1177 | return this->got_mod_index_offset_; | |
1178 | } | |
1179 | ||
2e30d253 ILT |
1180 | // Optimize the TLS relocation type based on what we know about the |
1181 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1182 | // known at link time. | |
1183 | ||
e041f13d | 1184 | tls::Tls_optimization |
2e30d253 ILT |
1185 | Target_x86_64::optimize_tls_reloc(bool is_final, int r_type) |
1186 | { | |
2e30d253 ILT |
1187 | // If we are generating a shared library, then we can't do anything |
1188 | // in the linker. | |
8851ecca | 1189 | if (parameters->options().shared()) |
e041f13d | 1190 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1191 | |
1192 | switch (r_type) | |
1193 | { | |
1194 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1195 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1196 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1197 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1198 | // access. Since we know that we are generating an executable, |
1199 | // we can convert this to Initial-Exec. If we also know that | |
1200 | // this is a local symbol, we can further switch to Local-Exec. | |
1201 | if (is_final) | |
e041f13d ILT |
1202 | return tls::TLSOPT_TO_LE; |
1203 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1204 | |
d61c17ea | 1205 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1206 | // This is Local-Dynamic, which refers to a local symbol in the |
1207 | // dynamic TLS block. Since we know that we generating an | |
1208 | // executable, we can switch to Local-Exec. | |
e041f13d | 1209 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1210 | |
0ffd9845 | 1211 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1212 | case elfcpp::R_X86_64_DTPOFF64: |
1213 | // Another Local-Dynamic reloc. | |
e041f13d | 1214 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1215 | |
d61c17ea | 1216 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1217 | // These are Initial-Exec relocs which get the thread offset |
1218 | // from the GOT. If we know that we are linking against the | |
1219 | // local symbol, we can switch to Local-Exec, which links the | |
1220 | // thread offset into the instruction. | |
1221 | if (is_final) | |
e041f13d ILT |
1222 | return tls::TLSOPT_TO_LE; |
1223 | return tls::TLSOPT_NONE; | |
2e30d253 | 1224 | |
d61c17ea | 1225 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1226 | // When we already have Local-Exec, there is nothing further we |
1227 | // can do. | |
e041f13d | 1228 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1229 | |
1230 | default: | |
1231 | gold_unreachable(); | |
1232 | } | |
2e30d253 ILT |
1233 | } |
1234 | ||
e041f13d ILT |
1235 | // Report an unsupported relocation against a local symbol. |
1236 | ||
1237 | void | |
1238 | Target_x86_64::Scan::unsupported_reloc_local(Sized_relobj<64, false>* object, | |
1239 | unsigned int r_type) | |
1240 | { | |
75f2446e ILT |
1241 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1242 | object->name().c_str(), r_type); | |
e041f13d ILT |
1243 | } |
1244 | ||
a036edd8 ILT |
1245 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1246 | // dynamic linker does not support it, issue an error. The GNU linker | |
1247 | // only issues a non-PIC error for an allocated read-only section. | |
1248 | // Here we know the section is allocated, but we don't know that it is | |
1249 | // read-only. But we check for all the relocation types which the | |
1250 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
1251 | // error even if the section is not read-only. | |
1252 | ||
1253 | void | |
1254 | Target_x86_64::Scan::check_non_pic(Relobj* object, unsigned int r_type) | |
1255 | { | |
1256 | switch (r_type) | |
1257 | { | |
1258 | // These are the relocation types supported by glibc for x86_64. | |
1259 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1260 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
1261 | case elfcpp::R_X86_64_GLOB_DAT: |
1262 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1263 | case elfcpp::R_X86_64_DTPMOD64: | |
1264 | case elfcpp::R_X86_64_DTPOFF64: | |
1265 | case elfcpp::R_X86_64_TPOFF64: | |
1266 | case elfcpp::R_X86_64_64: | |
1267 | case elfcpp::R_X86_64_32: | |
1268 | case elfcpp::R_X86_64_PC32: | |
1269 | case elfcpp::R_X86_64_COPY: | |
1270 | return; | |
1271 | ||
1272 | default: | |
1273 | // This prevents us from issuing more than one error per reloc | |
1274 | // section. But we can still wind up issuing more than one | |
1275 | // error per object file. | |
1276 | if (this->issued_non_pic_error_) | |
1277 | return; | |
33aea2fd | 1278 | gold_assert(parameters->options().output_is_position_independent()); |
a036edd8 ILT |
1279 | object->error(_("requires unsupported dynamic reloc; " |
1280 | "recompile with -fPIC")); | |
1281 | this->issued_non_pic_error_ = true; | |
1282 | return; | |
1283 | ||
1284 | case elfcpp::R_X86_64_NONE: | |
1285 | gold_unreachable(); | |
1286 | } | |
1287 | } | |
1288 | ||
7223e9ca ILT |
1289 | // Return whether we need to make a PLT entry for a relocation of the |
1290 | // given type against a STT_GNU_IFUNC symbol. | |
1291 | ||
1292 | bool | |
1293 | Target_x86_64::Scan::reloc_needs_plt_for_ifunc(Sized_relobj<64, false>* object, | |
1294 | unsigned int r_type) | |
1295 | { | |
1296 | switch (r_type) | |
1297 | { | |
1298 | case elfcpp::R_X86_64_NONE: | |
1299 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
1300 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
1301 | return false; | |
1302 | ||
1303 | case elfcpp::R_X86_64_64: | |
1304 | case elfcpp::R_X86_64_32: | |
1305 | case elfcpp::R_X86_64_32S: | |
1306 | case elfcpp::R_X86_64_16: | |
1307 | case elfcpp::R_X86_64_8: | |
1308 | case elfcpp::R_X86_64_PC64: | |
1309 | case elfcpp::R_X86_64_PC32: | |
1310 | case elfcpp::R_X86_64_PC16: | |
1311 | case elfcpp::R_X86_64_PC8: | |
1312 | case elfcpp::R_X86_64_PLT32: | |
1313 | case elfcpp::R_X86_64_GOTPC32: | |
1314 | case elfcpp::R_X86_64_GOTOFF64: | |
1315 | case elfcpp::R_X86_64_GOTPC64: | |
1316 | case elfcpp::R_X86_64_PLTOFF64: | |
1317 | case elfcpp::R_X86_64_GOT64: | |
1318 | case elfcpp::R_X86_64_GOT32: | |
1319 | case elfcpp::R_X86_64_GOTPCREL64: | |
1320 | case elfcpp::R_X86_64_GOTPCREL: | |
1321 | case elfcpp::R_X86_64_GOTPLT64: | |
1322 | return true; | |
1323 | ||
1324 | case elfcpp::R_X86_64_COPY: | |
1325 | case elfcpp::R_X86_64_GLOB_DAT: | |
1326 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1327 | case elfcpp::R_X86_64_RELATIVE: | |
1328 | case elfcpp::R_X86_64_IRELATIVE: | |
1329 | case elfcpp::R_X86_64_TPOFF64: | |
1330 | case elfcpp::R_X86_64_DTPMOD64: | |
1331 | case elfcpp::R_X86_64_TLSDESC: | |
1332 | // We will give an error later. | |
1333 | return false; | |
1334 | ||
1335 | case elfcpp::R_X86_64_TLSGD: | |
1336 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: | |
1337 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1338 | case elfcpp::R_X86_64_TLSLD: | |
1339 | case elfcpp::R_X86_64_DTPOFF32: | |
1340 | case elfcpp::R_X86_64_DTPOFF64: | |
1341 | case elfcpp::R_X86_64_GOTTPOFF: | |
1342 | case elfcpp::R_X86_64_TPOFF32: | |
1343 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
1344 | object->name().c_str(), r_type); | |
1345 | return false; | |
1346 | ||
1347 | case elfcpp::R_X86_64_SIZE32: | |
1348 | case elfcpp::R_X86_64_SIZE64: | |
1349 | default: | |
1350 | // We will give an error later. | |
1351 | return false; | |
1352 | } | |
1353 | } | |
1354 | ||
2e30d253 ILT |
1355 | // Scan a relocation for a local symbol. |
1356 | ||
1357 | inline void | |
ad0f2072 | 1358 | Target_x86_64::Scan::local(Symbol_table* symtab, |
d61c17ea ILT |
1359 | Layout* layout, |
1360 | Target_x86_64* target, | |
1361 | Sized_relobj<64, false>* object, | |
0ffd9845 | 1362 | unsigned int data_shndx, |
4f4c5f80 | 1363 | Output_section* output_section, |
0ffd9845 | 1364 | const elfcpp::Rela<64, false>& reloc, |
d61c17ea | 1365 | unsigned int r_type, |
7bf1f802 | 1366 | const elfcpp::Sym<64, false>& lsym) |
2e30d253 | 1367 | { |
7223e9ca ILT |
1368 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
1369 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC | |
1370 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1371 | { | |
1372 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
1373 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); | |
1374 | } | |
1375 | ||
2e30d253 ILT |
1376 | switch (r_type) |
1377 | { | |
1378 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1379 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1380 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1381 | break; |
1382 | ||
1383 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 1384 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
1385 | // executable), we need to create a dynamic relocation for this |
1386 | // location. The relocation applied at link time will apply the | |
1387 | // link-time value, so we flag the location with an | |
1388 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 1389 | // relocate it easily. |
8851ecca | 1390 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 1391 | { |
e8c846c3 | 1392 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
d61c6bd4 | 1393 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
1394 | rela_dyn->add_local_relative(object, r_sym, |
1395 | elfcpp::R_X86_64_RELATIVE, | |
1396 | output_section, data_shndx, | |
1397 | reloc.get_r_offset(), | |
1398 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1399 | } |
1400 | break; | |
1401 | ||
2e30d253 ILT |
1402 | case elfcpp::R_X86_64_32: |
1403 | case elfcpp::R_X86_64_32S: | |
1404 | case elfcpp::R_X86_64_16: | |
1405 | case elfcpp::R_X86_64_8: | |
96f2030e | 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. We can't use an R_X86_64_RELATIVE relocation | |
1409 | // because that is always a 64-bit relocation. | |
8851ecca | 1410 | if (parameters->options().output_is_position_independent()) |
96f2030e | 1411 | { |
a036edd8 ILT |
1412 | this->check_non_pic(object, r_type); |
1413 | ||
96f2030e | 1414 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
d491d34e | 1415 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
dceae3c1 | 1416 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
1417 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
1418 | data_shndx, reloc.get_r_offset(), | |
1419 | reloc.get_r_addend()); | |
dceae3c1 ILT |
1420 | else |
1421 | { | |
1422 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
1423 | unsigned int shndx = lsym.get_st_shndx(); |
1424 | bool is_ordinary; | |
1425 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
1426 | &is_ordinary); | |
1427 | if (!is_ordinary) | |
1428 | object->error(_("section symbol %u has bad shndx %u"), | |
1429 | r_sym, shndx); | |
1430 | else | |
1431 | rela_dyn->add_local_section(object, shndx, | |
1432 | r_type, output_section, | |
1433 | data_shndx, reloc.get_r_offset(), | |
1434 | reloc.get_r_addend()); | |
dceae3c1 | 1435 | } |
96f2030e | 1436 | } |
2e30d253 ILT |
1437 | break; |
1438 | ||
1439 | case elfcpp::R_X86_64_PC64: | |
1440 | case elfcpp::R_X86_64_PC32: | |
1441 | case elfcpp::R_X86_64_PC16: | |
1442 | case elfcpp::R_X86_64_PC8: | |
1443 | break; | |
1444 | ||
f389a824 ILT |
1445 | case elfcpp::R_X86_64_PLT32: |
1446 | // Since we know this is a local symbol, we can handle this as a | |
1447 | // PC32 reloc. | |
1448 | break; | |
1449 | ||
fdc2f80f | 1450 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1451 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1452 | case elfcpp::R_X86_64_GOTPC64: |
1453 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1454 | // We need a GOT section. |
1455 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1456 | // For PLTOFF64, we'd normally want a PLT section, but since we |
1457 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
1458 | break; |
1459 | ||
0ffd9845 ILT |
1460 | case elfcpp::R_X86_64_GOT64: |
1461 | case elfcpp::R_X86_64_GOT32: | |
1462 | case elfcpp::R_X86_64_GOTPCREL64: | |
1463 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 1464 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
1465 | { |
1466 | // The symbol requires a GOT entry. | |
1467 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1468 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
7223e9ca ILT |
1469 | |
1470 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
1471 | // lets function pointers compare correctly with shared | |
1472 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
1473 | bool is_new; | |
1474 | if (lsym.get_st_type() == elfcpp::STT_GNU_IFUNC) | |
1475 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); | |
1476 | else | |
1477 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
1478 | if (is_new) | |
0ffd9845 ILT |
1479 | { |
1480 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 1481 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 1482 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
1483 | { |
1484 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
1485 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
1486 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
1487 | { |
1488 | unsigned int got_offset = | |
1489 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
1490 | rela_dyn->add_local_relative(object, r_sym, | |
1491 | elfcpp::R_X86_64_RELATIVE, | |
1492 | got, got_offset, 0); | |
1493 | } | |
7bf1f802 | 1494 | else |
dceae3c1 | 1495 | { |
a036edd8 ILT |
1496 | this->check_non_pic(object, r_type); |
1497 | ||
dceae3c1 | 1498 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
1499 | rela_dyn->add_local( |
1500 | object, r_sym, r_type, got, | |
1501 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 1502 | } |
0ffd9845 ILT |
1503 | } |
1504 | } | |
ee9e9e86 ILT |
1505 | // For GOTPLT64, we'd normally want a PLT section, but since |
1506 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
1507 | } |
1508 | break; | |
1509 | ||
2e30d253 ILT |
1510 | case elfcpp::R_X86_64_COPY: |
1511 | case elfcpp::R_X86_64_GLOB_DAT: | |
1512 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1513 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1514 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 1515 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 1516 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1517 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 1518 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1519 | gold_error(_("%s: unexpected reloc %u in object file"), |
1520 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1521 | break; |
1522 | ||
d61c17ea | 1523 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
1524 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1525 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1526 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1527 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1528 | case elfcpp::R_X86_64_DTPOFF32: |
1529 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1530 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1531 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 1532 | { |
8851ecca | 1533 | bool output_is_shared = parameters->options().shared(); |
e041f13d ILT |
1534 | const tls::Tls_optimization optimized_type |
1535 | = Target_x86_64::optimize_tls_reloc(!output_is_shared, r_type); | |
2e30d253 ILT |
1536 | switch (r_type) |
1537 | { | |
56622147 | 1538 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1539 | if (optimized_type == tls::TLSOPT_NONE) |
1540 | { | |
1541 | // Create a pair of GOT entries for the module index and | |
1542 | // dtv-relative offset. | |
1543 | Output_data_got<64, false>* got | |
1544 | = target->got_section(symtab, layout); | |
1545 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
d491d34e ILT |
1546 | unsigned int shndx = lsym.get_st_shndx(); |
1547 | bool is_ordinary; | |
1548 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
1549 | if (!is_ordinary) | |
1550 | object->error(_("local symbol %u has bad shndx %u"), | |
1551 | r_sym, shndx); | |
1552 | else | |
1553 | got->add_local_pair_with_rela(object, r_sym, | |
1554 | shndx, | |
1555 | GOT_TYPE_TLS_PAIR, | |
1556 | target->rela_dyn_section(layout), | |
1557 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
1558 | } |
1559 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1560 | unsupported_reloc_local(object, r_type); | |
1561 | break; | |
1562 | ||
56622147 | 1563 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 1564 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
1565 | if (optimized_type == tls::TLSOPT_NONE) |
1566 | { | |
1567 | // Create reserved PLT and GOT entries for the resolver. | |
1568 | target->reserve_tlsdesc_entries(symtab, layout); | |
1569 | ||
a8df5856 ILT |
1570 | // Generate a double GOT entry with an |
1571 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
1572 | // is resolved lazily, so the GOT entry needs to be in | |
1573 | // an area in .got.plt, not .got. Call got_section to | |
1574 | // make sure the section has been created. | |
1575 | target->got_section(symtab, layout); | |
1576 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
c2b45e22 | 1577 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); |
e291e7b9 ILT |
1578 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
1579 | { | |
1580 | unsigned int got_offset = got->add_constant(0); | |
1581 | got->add_constant(0); | |
1582 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
1583 | got_offset); | |
1584 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
1585 | // We store the arguments we need in a vector, and | |
1586 | // use the index into the vector as the parameter | |
1587 | // to pass to the target specific routines. | |
1588 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
1589 | void* arg = reinterpret_cast<void*>(intarg); | |
1590 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1591 | got, got_offset, 0); | |
1592 | } | |
c2b45e22 CC |
1593 | } |
1594 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 1595 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
1596 | break; |
1597 | ||
c2b45e22 CC |
1598 | case elfcpp::R_X86_64_TLSDESC_CALL: |
1599 | break; | |
1600 | ||
e041f13d | 1601 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
1602 | if (optimized_type == tls::TLSOPT_NONE) |
1603 | { | |
1604 | // Create a GOT entry for the module index. | |
31d60480 | 1605 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
1606 | } |
1607 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1608 | unsupported_reloc_local(object, r_type); | |
1609 | break; | |
1610 | ||
0ffd9845 ILT |
1611 | case elfcpp::R_X86_64_DTPOFF32: |
1612 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
1613 | break; |
1614 | ||
56622147 | 1615 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 1616 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1617 | if (optimized_type == tls::TLSOPT_NONE) |
1618 | { | |
1619 | // Create a GOT entry for the tp-relative offset. | |
1620 | Output_data_got<64, false>* got | |
1621 | = target->got_section(symtab, layout); | |
1622 | unsigned int r_sym = elfcpp::elf_r_sym<64>(reloc.get_r_info()); | |
0a65a3a7 | 1623 | got->add_local_with_rela(object, r_sym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1624 | target->rela_dyn_section(layout), |
1625 | elfcpp::R_X86_64_TPOFF64); | |
1626 | } | |
1627 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
1628 | unsupported_reloc_local(object, r_type); |
1629 | break; | |
0ffd9845 | 1630 | |
56622147 | 1631 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 1632 | layout->set_has_static_tls(); |
7bf1f802 ILT |
1633 | if (output_is_shared) |
1634 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 1635 | break; |
e041f13d ILT |
1636 | |
1637 | default: | |
1638 | gold_unreachable(); | |
2e30d253 ILT |
1639 | } |
1640 | } | |
1641 | break; | |
2e30d253 | 1642 | |
fdc2f80f ILT |
1643 | case elfcpp::R_X86_64_SIZE32: |
1644 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 1645 | default: |
75f2446e ILT |
1646 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1647 | object->name().c_str(), r_type); | |
2e30d253 ILT |
1648 | break; |
1649 | } | |
1650 | } | |
1651 | ||
1652 | ||
e041f13d ILT |
1653 | // Report an unsupported relocation against a global symbol. |
1654 | ||
1655 | void | |
1656 | Target_x86_64::Scan::unsupported_reloc_global(Sized_relobj<64, false>* object, | |
1657 | unsigned int r_type, | |
1658 | Symbol* gsym) | |
1659 | { | |
75f2446e | 1660 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 1661 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
1662 | } |
1663 | ||
ce97fa81 | 1664 | // Returns true if this relocation type could be that of a function pointer. |
21bb3914 ST |
1665 | inline bool |
1666 | Target_x86_64::Scan::possible_function_pointer_reloc(unsigned int r_type) | |
1667 | { | |
21bb3914 ST |
1668 | switch (r_type) |
1669 | { | |
1670 | case elfcpp::R_X86_64_64: | |
1671 | case elfcpp::R_X86_64_32: | |
1672 | case elfcpp::R_X86_64_32S: | |
1673 | case elfcpp::R_X86_64_16: | |
1674 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
1675 | case elfcpp::R_X86_64_GOT64: |
1676 | case elfcpp::R_X86_64_GOT32: | |
1677 | case elfcpp::R_X86_64_GOTPCREL64: | |
1678 | case elfcpp::R_X86_64_GOTPCREL: | |
1679 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
1680 | { |
1681 | return true; | |
1682 | } | |
1683 | } | |
1684 | return false; | |
1685 | } | |
1686 | ||
1687 | // For safe ICF, scan a relocation for a local symbol to check if it | |
1688 | // corresponds to a function pointer being taken. In that case mark | |
1689 | // the function whose pointer was taken as not foldable. | |
1690 | ||
1691 | inline bool | |
1692 | Target_x86_64::Scan::local_reloc_may_be_function_pointer( | |
1693 | Symbol_table* , | |
1694 | Layout* , | |
1695 | Target_x86_64* , | |
1696 | Sized_relobj<64, false>* , | |
1697 | unsigned int , | |
1698 | Output_section* , | |
1699 | const elfcpp::Rela<64, false>& , | |
1700 | unsigned int r_type, | |
1701 | const elfcpp::Sym<64, false>&) | |
1702 | { | |
1703 | // When building a shared library, do not fold any local symbols as it is | |
1704 | // not possible to distinguish pointer taken versus a call by looking at | |
1705 | // the relocation types. | |
1706 | return (parameters->options().shared() | |
1707 | || possible_function_pointer_reloc(r_type)); | |
1708 | } | |
1709 | ||
1710 | // For safe ICF, scan a relocation for a global symbol to check if it | |
1711 | // corresponds to a function pointer being taken. In that case mark | |
1712 | // the function whose pointer was taken as not foldable. | |
1713 | ||
1714 | inline bool | |
1715 | Target_x86_64::Scan::global_reloc_may_be_function_pointer( | |
1716 | Symbol_table*, | |
1717 | Layout* , | |
1718 | Target_x86_64* , | |
1719 | Sized_relobj<64, false>* , | |
1720 | unsigned int , | |
1721 | Output_section* , | |
1722 | const elfcpp::Rela<64, false>& , | |
1723 | unsigned int r_type, | |
1724 | Symbol* gsym) | |
1725 | { | |
1726 | // When building a shared library, do not fold symbols whose visibility | |
1727 | // is hidden, internal or protected. | |
1728 | return ((parameters->options().shared() | |
1729 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
1730 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
1731 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
1732 | || possible_function_pointer_reloc(r_type)); | |
1733 | } | |
1734 | ||
2e30d253 ILT |
1735 | // Scan a relocation for a global symbol. |
1736 | ||
1737 | inline void | |
ad0f2072 | 1738 | Target_x86_64::Scan::global(Symbol_table* symtab, |
d61c17ea ILT |
1739 | Layout* layout, |
1740 | Target_x86_64* target, | |
1741 | Sized_relobj<64, false>* object, | |
1742 | unsigned int data_shndx, | |
4f4c5f80 | 1743 | Output_section* output_section, |
d61c17ea ILT |
1744 | const elfcpp::Rela<64, false>& reloc, |
1745 | unsigned int r_type, | |
1746 | Symbol* gsym) | |
2e30d253 | 1747 | { |
7223e9ca ILT |
1748 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
1749 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1750 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
1751 | target->make_plt_entry(symtab, layout, gsym); | |
1752 | ||
2e30d253 ILT |
1753 | switch (r_type) |
1754 | { | |
1755 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
1756 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
1757 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
1758 | break; |
1759 | ||
1760 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
1761 | case elfcpp::R_X86_64_32: |
1762 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 1763 | case elfcpp::R_X86_64_16: |
2e30d253 | 1764 | case elfcpp::R_X86_64_8: |
96f2030e | 1765 | { |
d61c6bd4 ILT |
1766 | // Make a PLT entry if necessary. |
1767 | if (gsym->needs_plt_entry()) | |
1768 | { | |
1769 | target->make_plt_entry(symtab, layout, gsym); | |
1770 | // Since this is not a PC-relative relocation, we may be | |
1771 | // taking the address of a function. In that case we need to | |
1772 | // set the entry in the dynamic symbol table to the address of | |
1773 | // the PLT entry. | |
8851ecca | 1774 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
1775 | gsym->set_needs_dynsym_value(); |
1776 | } | |
1777 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1778 | if (gsym->needs_dynamic_reloc(Symbol::ABSOLUTE_REF)) |
d61c6bd4 | 1779 | { |
966d4097 | 1780 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1781 | { |
12c0daef | 1782 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1783 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1784 | } |
7223e9ca ILT |
1785 | else if (r_type == elfcpp::R_X86_64_64 |
1786 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
1787 | && gsym->can_use_relative_reloc(false) | |
1788 | && !gsym->is_from_dynobj() | |
1789 | && !gsym->is_undefined() | |
1790 | && !gsym->is_preemptible()) | |
1791 | { | |
1792 | // Use an IRELATIVE reloc for a locally defined | |
1793 | // STT_GNU_IFUNC symbol. This makes a function | |
1794 | // address in a PIE executable match the address in a | |
1795 | // shared library that it links against. | |
1796 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
1797 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; | |
1798 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
1799 | output_section, object, | |
1800 | data_shndx, | |
1801 | reloc.get_r_offset(), | |
1802 | reloc.get_r_addend()); | |
1803 | } | |
d61c6bd4 ILT |
1804 | else if (r_type == elfcpp::R_X86_64_64 |
1805 | && gsym->can_use_relative_reloc(false)) | |
1806 | { | |
1807 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
1808 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
1809 | output_section, object, | |
1810 | data_shndx, | |
1811 | reloc.get_r_offset(), | |
1812 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
1813 | } |
1814 | else | |
1815 | { | |
a036edd8 | 1816 | this->check_non_pic(object, r_type); |
96f2030e | 1817 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1818 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1819 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 1820 | reloc.get_r_addend()); |
d61c6bd4 ILT |
1821 | } |
1822 | } | |
1823 | } | |
1824 | break; | |
1825 | ||
1826 | case elfcpp::R_X86_64_PC64: | |
1827 | case elfcpp::R_X86_64_PC32: | |
1828 | case elfcpp::R_X86_64_PC16: | |
1829 | case elfcpp::R_X86_64_PC8: | |
1830 | { | |
1831 | // Make a PLT entry if necessary. | |
1832 | if (gsym->needs_plt_entry()) | |
1833 | target->make_plt_entry(symtab, layout, gsym); | |
1834 | // Make a dynamic relocation if necessary. | |
0700cf32 | 1835 | int flags = Symbol::NON_PIC_REF; |
53d7974c | 1836 | if (gsym->is_func()) |
0700cf32 ILT |
1837 | flags |= Symbol::FUNCTION_CALL; |
1838 | if (gsym->needs_dynamic_reloc(flags)) | |
86849f1f | 1839 | { |
966d4097 | 1840 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 1841 | { |
12c0daef | 1842 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 1843 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 1844 | } |
86849f1f | 1845 | else |
d61c6bd4 | 1846 | { |
a036edd8 | 1847 | this->check_non_pic(object, r_type); |
d61c6bd4 | 1848 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
1849 | rela_dyn->add_global(gsym, r_type, output_section, object, |
1850 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
1851 | reloc.get_r_addend()); |
1852 | } | |
86849f1f | 1853 | } |
d61c6bd4 | 1854 | } |
2e30d253 ILT |
1855 | break; |
1856 | ||
ff006520 | 1857 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 1858 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
1859 | case elfcpp::R_X86_64_GOTPCREL64: |
1860 | case elfcpp::R_X86_64_GOTPCREL: | |
1861 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
1862 | { |
1863 | // The symbol requires a GOT entry. | |
1864 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 1865 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
1866 | { |
1867 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
1868 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1869 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1870 | else | |
1871 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
1872 | } | |
7bf1f802 ILT |
1873 | else |
1874 | { | |
2e30d253 ILT |
1875 | // If this symbol is not fully resolved, we need to add a |
1876 | // dynamic relocation for it. | |
7bf1f802 | 1877 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
1878 | if (gsym->is_from_dynobj() |
1879 | || gsym->is_undefined() | |
1880 | || gsym->is_preemptible() | |
1881 | || (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1882 | && parameters->options().output_is_position_independent())) | |
0a65a3a7 | 1883 | got->add_global_with_rela(gsym, GOT_TYPE_STANDARD, rela_dyn, |
7bf1f802 ILT |
1884 | elfcpp::R_X86_64_GLOB_DAT); |
1885 | else | |
2e30d253 | 1886 | { |
7223e9ca ILT |
1887 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
1888 | // offset into the GOT, so that function pointer | |
1889 | // comparisons work correctly. | |
1890 | bool is_new; | |
1891 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
1892 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
1893 | else | |
1894 | { | |
1895 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
1896 | // Tell the dynamic linker to use the PLT address | |
1897 | // when resolving relocations. | |
1898 | if (gsym->is_from_dynobj() | |
1899 | && !parameters->options().shared()) | |
1900 | gsym->set_needs_dynsym_value(); | |
1901 | } | |
1902 | if (is_new) | |
1903 | { | |
1904 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
1905 | rela_dyn->add_global_relative(gsym, | |
1906 | elfcpp::R_X86_64_RELATIVE, | |
1907 | got, got_off, 0); | |
1908 | } | |
2e30d253 ILT |
1909 | } |
1910 | } | |
ee9e9e86 ILT |
1911 | // For GOTPLT64, we also need a PLT entry (but only if the |
1912 | // symbol is not fully resolved). | |
1913 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
1914 | && !gsym->final_value_is_known()) | |
1915 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1916 | } |
1917 | break; | |
1918 | ||
1919 | case elfcpp::R_X86_64_PLT32: | |
1920 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
1921 | // Otherwise we need a PLT entry. | |
1922 | if (gsym->final_value_is_known()) | |
1923 | break; | |
96f2030e ILT |
1924 | // If building a shared library, we can also skip the PLT entry |
1925 | // if the symbol is defined in the output file and is protected | |
1926 | // or hidden. | |
1927 | if (gsym->is_defined() | |
1928 | && !gsym->is_from_dynobj() | |
1929 | && !gsym->is_preemptible()) | |
1930 | break; | |
2e30d253 ILT |
1931 | target->make_plt_entry(symtab, layout, gsym); |
1932 | break; | |
1933 | ||
fdc2f80f | 1934 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 1935 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
1936 | case elfcpp::R_X86_64_GOTPC64: |
1937 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
1938 | // We need a GOT section. |
1939 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
1940 | // For PLTOFF64, we also need a PLT entry (but only if the |
1941 | // symbol is not fully resolved). | |
1942 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
1943 | && !gsym->final_value_is_known()) | |
1944 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
1945 | break; |
1946 | ||
2e30d253 ILT |
1947 | case elfcpp::R_X86_64_COPY: |
1948 | case elfcpp::R_X86_64_GLOB_DAT: | |
1949 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1950 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 1951 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 1952 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 1953 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 1954 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 1955 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
1956 | gold_error(_("%s: unexpected reloc %u in object file"), |
1957 | object->name().c_str(), r_type); | |
2e30d253 | 1958 | break; |
2e30d253 | 1959 | |
d61c17ea | 1960 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
1961 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
1962 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 1963 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 1964 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
1965 | case elfcpp::R_X86_64_DTPOFF32: |
1966 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
1967 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
1968 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
1969 | { |
1970 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d ILT |
1971 | const tls::Tls_optimization optimized_type |
1972 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); | |
2e30d253 ILT |
1973 | switch (r_type) |
1974 | { | |
56622147 | 1975 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
1976 | if (optimized_type == tls::TLSOPT_NONE) |
1977 | { | |
1978 | // Create a pair of GOT entries for the module index and | |
1979 | // dtv-relative offset. | |
1980 | Output_data_got<64, false>* got | |
1981 | = target->got_section(symtab, layout); | |
0a65a3a7 CC |
1982 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_PAIR, |
1983 | target->rela_dyn_section(layout), | |
1984 | elfcpp::R_X86_64_DTPMOD64, | |
1985 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
1986 | } |
1987 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
1988 | { | |
1989 | // Create a GOT entry for the tp-relative offset. | |
1990 | Output_data_got<64, false>* got | |
1991 | = target->got_section(symtab, layout); | |
0a65a3a7 | 1992 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
1993 | target->rela_dyn_section(layout), |
1994 | elfcpp::R_X86_64_TPOFF64); | |
1995 | } | |
1996 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
1997 | unsupported_reloc_global(object, r_type, gsym); | |
1998 | break; | |
1999 | ||
56622147 | 2000 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 2001 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2002 | if (optimized_type == tls::TLSOPT_NONE) |
2003 | { | |
2004 | // Create reserved PLT and GOT entries for the resolver. | |
2005 | target->reserve_tlsdesc_entries(symtab, layout); | |
2006 | ||
a8df5856 ILT |
2007 | // Create a double GOT entry with an R_X86_64_TLSDESC |
2008 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
2009 | // lazily, so the GOT entry needs to be in an area in | |
2010 | // .got.plt, not .got. Call got_section to make sure | |
2011 | // the section has been created. | |
2012 | target->got_section(symtab, layout); | |
2013 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
ca09d69a | 2014 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
e291e7b9 | 2015 | got->add_global_pair_with_rela(gsym, GOT_TYPE_TLS_DESC, rt, |
c2b45e22 CC |
2016 | elfcpp::R_X86_64_TLSDESC, 0); |
2017 | } | |
2018 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2019 | { | |
2020 | // Create a GOT entry for the tp-relative offset. | |
2021 | Output_data_got<64, false>* got | |
2022 | = target->got_section(symtab, layout); | |
2023 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, | |
2024 | target->rela_dyn_section(layout), | |
2025 | elfcpp::R_X86_64_TPOFF64); | |
2026 | } | |
2027 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2028 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
2029 | break; |
2030 | ||
c2b45e22 CC |
2031 | case elfcpp::R_X86_64_TLSDESC_CALL: |
2032 | break; | |
2033 | ||
e041f13d | 2034 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2035 | if (optimized_type == tls::TLSOPT_NONE) |
2036 | { | |
2037 | // Create a GOT entry for the module index. | |
31d60480 | 2038 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
2039 | } |
2040 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2041 | unsupported_reloc_global(object, r_type, gsym); | |
2042 | break; | |
2043 | ||
0ffd9845 ILT |
2044 | case elfcpp::R_X86_64_DTPOFF32: |
2045 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2046 | break; |
2047 | ||
56622147 | 2048 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2049 | layout->set_has_static_tls(); |
7bf1f802 ILT |
2050 | if (optimized_type == tls::TLSOPT_NONE) |
2051 | { | |
2052 | // Create a GOT entry for the tp-relative offset. | |
2053 | Output_data_got<64, false>* got | |
2054 | = target->got_section(symtab, layout); | |
0a65a3a7 | 2055 | got->add_global_with_rela(gsym, GOT_TYPE_TLS_OFFSET, |
7bf1f802 ILT |
2056 | target->rela_dyn_section(layout), |
2057 | elfcpp::R_X86_64_TPOFF64); | |
2058 | } | |
2059 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
2060 | unsupported_reloc_global(object, r_type, gsym); |
2061 | break; | |
0ffd9845 | 2062 | |
56622147 | 2063 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2064 | layout->set_has_static_tls(); |
8851ecca | 2065 | if (parameters->options().shared()) |
7bf1f802 | 2066 | unsupported_reloc_local(object, r_type); |
2e30d253 | 2067 | break; |
e041f13d ILT |
2068 | |
2069 | default: | |
2070 | gold_unreachable(); | |
2e30d253 ILT |
2071 | } |
2072 | } | |
2073 | break; | |
fdc2f80f ILT |
2074 | |
2075 | case elfcpp::R_X86_64_SIZE32: | |
2076 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2077 | default: |
75f2446e | 2078 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
2079 | object->name().c_str(), r_type, |
2080 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
2081 | break; |
2082 | } | |
2083 | } | |
2084 | ||
6d03d481 | 2085 | void |
ad0f2072 | 2086 | Target_x86_64::gc_process_relocs(Symbol_table* symtab, |
6d03d481 ST |
2087 | Layout* layout, |
2088 | Sized_relobj<64, false>* object, | |
2089 | unsigned int data_shndx, | |
2090 | unsigned int sh_type, | |
2091 | const unsigned char* prelocs, | |
2092 | size_t reloc_count, | |
2093 | Output_section* output_section, | |
2094 | bool needs_special_offset_handling, | |
2095 | size_t local_symbol_count, | |
2096 | const unsigned char* plocal_symbols) | |
2097 | { | |
2098 | ||
2099 | if (sh_type == elfcpp::SHT_REL) | |
2100 | { | |
2101 | return; | |
2102 | } | |
2103 | ||
2104 | gold::gc_process_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
41cbeecc ST |
2105 | Target_x86_64::Scan, |
2106 | Target_x86_64::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2107 | symtab, |
2108 | layout, | |
2109 | this, | |
2110 | object, | |
2111 | data_shndx, | |
2112 | prelocs, | |
2113 | reloc_count, | |
2114 | output_section, | |
2115 | needs_special_offset_handling, | |
2116 | local_symbol_count, | |
2117 | plocal_symbols); | |
2118 | ||
2119 | } | |
2e30d253 ILT |
2120 | // Scan relocations for a section. |
2121 | ||
2122 | void | |
ad0f2072 | 2123 | Target_x86_64::scan_relocs(Symbol_table* symtab, |
d61c17ea ILT |
2124 | Layout* layout, |
2125 | Sized_relobj<64, false>* object, | |
2126 | unsigned int data_shndx, | |
2127 | unsigned int sh_type, | |
2128 | const unsigned char* prelocs, | |
2129 | size_t reloc_count, | |
730cdc88 ILT |
2130 | Output_section* output_section, |
2131 | bool needs_special_offset_handling, | |
d61c17ea | 2132 | size_t local_symbol_count, |
730cdc88 | 2133 | const unsigned char* plocal_symbols) |
2e30d253 ILT |
2134 | { |
2135 | if (sh_type == elfcpp::SHT_REL) | |
2136 | { | |
75f2446e ILT |
2137 | gold_error(_("%s: unsupported REL reloc section"), |
2138 | object->name().c_str()); | |
2139 | return; | |
2e30d253 ILT |
2140 | } |
2141 | ||
2142 | gold::scan_relocs<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2143 | Target_x86_64::Scan>( | |
2e30d253 ILT |
2144 | symtab, |
2145 | layout, | |
2146 | this, | |
2147 | object, | |
2148 | data_shndx, | |
2149 | prelocs, | |
2150 | reloc_count, | |
730cdc88 ILT |
2151 | output_section, |
2152 | needs_special_offset_handling, | |
2e30d253 | 2153 | local_symbol_count, |
730cdc88 | 2154 | plocal_symbols); |
2e30d253 ILT |
2155 | } |
2156 | ||
2157 | // Finalize the sections. | |
2158 | ||
2159 | void | |
f59f41f3 DK |
2160 | Target_x86_64::do_finalize_sections( |
2161 | Layout* layout, | |
2162 | const Input_objects*, | |
e785ec03 | 2163 | Symbol_table* symtab) |
2e30d253 | 2164 | { |
ea715a34 ILT |
2165 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2166 | ? NULL | |
e291e7b9 | 2167 | : this->plt_->rela_plt()); |
ea715a34 | 2168 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 2169 | this->rela_dyn_, true, false); |
ea715a34 | 2170 | |
2e30d253 ILT |
2171 | // Fill in some more dynamic tags. |
2172 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
2173 | if (odyn != NULL) | |
2174 | { | |
22b127cc | 2175 | if (this->plt_ != NULL |
ea715a34 ILT |
2176 | && this->plt_->output_section() != NULL |
2177 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 2178 | { |
ea715a34 ILT |
2179 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
2180 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
2181 | this->got_->finalize_data_size(); | |
2182 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
2183 | this->plt_, plt_offset); | |
2184 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
2185 | this->got_, got_offset); | |
2e30d253 ILT |
2186 | } |
2187 | } | |
2188 | ||
2189 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2190 | // relocs. | |
12c0daef ILT |
2191 | if (this->copy_relocs_.any_saved_relocs()) |
2192 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
2193 | |
2194 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2195 | // the .got.plt section. | |
2196 | Symbol* sym = this->global_offset_table_; | |
2197 | if (sym != NULL) | |
2198 | { | |
2199 | uint64_t data_size = this->got_plt_->current_data_size(); | |
2200 | symtab->get_sized_symbol<64>(sym)->set_symsize(data_size); | |
2201 | } | |
2e30d253 ILT |
2202 | } |
2203 | ||
2204 | // Perform a relocation. | |
2205 | ||
2206 | inline bool | |
2207 | Target_x86_64::Relocate::relocate(const Relocate_info<64, false>* relinfo, | |
2208 | Target_x86_64* target, | |
031cdbed | 2209 | Output_section*, |
2e30d253 | 2210 | size_t relnum, |
0ffd9845 | 2211 | const elfcpp::Rela<64, false>& rela, |
2e30d253 ILT |
2212 | unsigned int r_type, |
2213 | const Sized_symbol<64>* gsym, | |
2214 | const Symbol_value<64>* psymval, | |
2215 | unsigned char* view, | |
2216 | elfcpp::Elf_types<64>::Elf_Addr address, | |
fe8718a4 | 2217 | section_size_type view_size) |
2e30d253 ILT |
2218 | { |
2219 | if (this->skip_call_tls_get_addr_) | |
2220 | { | |
5efc7cd2 CC |
2221 | if ((r_type != elfcpp::R_X86_64_PLT32 |
2222 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 2223 | || gsym == NULL |
0ffd9845 | 2224 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 2225 | { |
75f2446e ILT |
2226 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2227 | _("missing expected TLS relocation")); | |
2228 | } | |
2229 | else | |
2230 | { | |
2231 | this->skip_call_tls_get_addr_ = false; | |
2232 | return false; | |
2e30d253 | 2233 | } |
2e30d253 ILT |
2234 | } |
2235 | ||
7223e9ca ILT |
2236 | const Sized_relobj<64, false>* object = relinfo->object; |
2237 | ||
2238 | // Pick the value to use for symbols defined in the PLT. | |
2e30d253 | 2239 | Symbol_value<64> symval; |
96f2030e | 2240 | if (gsym != NULL |
de4c45bd ILT |
2241 | && gsym->use_plt_offset(r_type == elfcpp::R_X86_64_PC64 |
2242 | || r_type == elfcpp::R_X86_64_PC32 | |
2243 | || r_type == elfcpp::R_X86_64_PC16 | |
2244 | || r_type == elfcpp::R_X86_64_PC8)) | |
2e30d253 ILT |
2245 | { |
2246 | symval.set_output_value(target->plt_section()->address() | |
2247 | + gsym->plt_offset()); | |
2248 | psymval = &symval; | |
2249 | } | |
7223e9ca ILT |
2250 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2251 | { | |
2252 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2253 | if (object->local_has_plt_offset(r_sym)) | |
2254 | { | |
2255 | symval.set_output_value(target->plt_section()->address() | |
2256 | + object->local_plt_offset(r_sym)); | |
2257 | psymval = &symval; | |
2258 | } | |
2259 | } | |
2e30d253 | 2260 | |
0ffd9845 ILT |
2261 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2262 | ||
2263 | // Get the GOT offset if needed. | |
96f2030e ILT |
2264 | // The GOT pointer points to the end of the GOT section. |
2265 | // We need to subtract the size of the GOT section to get | |
2266 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
2267 | bool have_got_offset = false; |
2268 | unsigned int got_offset = 0; | |
2269 | switch (r_type) | |
2270 | { | |
2271 | case elfcpp::R_X86_64_GOT32: | |
2272 | case elfcpp::R_X86_64_GOT64: | |
2273 | case elfcpp::R_X86_64_GOTPLT64: | |
2274 | case elfcpp::R_X86_64_GOTPCREL: | |
2275 | case elfcpp::R_X86_64_GOTPCREL64: | |
2276 | if (gsym != NULL) | |
2277 | { | |
0a65a3a7 CC |
2278 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
2279 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
2280 | } |
2281 | else | |
2282 | { | |
2283 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2284 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
2285 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
2286 | - target->got_size()); | |
0ffd9845 ILT |
2287 | } |
2288 | have_got_offset = true; | |
2289 | break; | |
2290 | ||
2291 | default: | |
2292 | break; | |
2293 | } | |
2e30d253 ILT |
2294 | |
2295 | switch (r_type) | |
2296 | { | |
2297 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2298 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2299 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2300 | break; |
2301 | ||
2302 | case elfcpp::R_X86_64_64: | |
2303 | Relocate_functions<64, false>::rela64(view, object, psymval, addend); | |
2304 | break; | |
2305 | ||
2306 | case elfcpp::R_X86_64_PC64: | |
2307 | Relocate_functions<64, false>::pcrela64(view, object, psymval, addend, | |
2308 | address); | |
2309 | break; | |
2310 | ||
2311 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
2312 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2313 | // uint64_t x = value + addend; | |
2314 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
2315 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
2e30d253 ILT |
2316 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2317 | break; | |
2318 | ||
2319 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
2320 | // FIXME: we need to verify that value + addend fits into 32 bits: |
2321 | // int64_t x = value + addend; // note this quantity is signed! | |
2322 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
2e30d253 ILT |
2323 | Relocate_functions<64, false>::rela32(view, object, psymval, addend); |
2324 | break; | |
2325 | ||
2326 | case elfcpp::R_X86_64_PC32: | |
2327 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, | |
2328 | address); | |
2329 | break; | |
2330 | ||
2331 | case elfcpp::R_X86_64_16: | |
2332 | Relocate_functions<64, false>::rela16(view, object, psymval, addend); | |
2333 | break; | |
2334 | ||
2335 | case elfcpp::R_X86_64_PC16: | |
2336 | Relocate_functions<64, false>::pcrela16(view, object, psymval, addend, | |
2337 | address); | |
2338 | break; | |
2339 | ||
2340 | case elfcpp::R_X86_64_8: | |
2341 | Relocate_functions<64, false>::rela8(view, object, psymval, addend); | |
2342 | break; | |
2343 | ||
2344 | case elfcpp::R_X86_64_PC8: | |
2345 | Relocate_functions<64, false>::pcrela8(view, object, psymval, addend, | |
2346 | address); | |
2347 | break; | |
2348 | ||
2349 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
2350 | gold_assert(gsym == NULL |
2351 | || gsym->has_plt_offset() | |
99f8faca ILT |
2352 | || gsym->final_value_is_known() |
2353 | || (gsym->is_defined() | |
2354 | && !gsym->is_from_dynobj() | |
2355 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
2356 | // Note: while this code looks the same as for R_X86_64_PC32, it |
2357 | // behaves differently because psymval was set to point to | |
2358 | // the PLT entry, rather than the symbol, in Scan::global(). | |
2e30d253 ILT |
2359 | Relocate_functions<64, false>::pcrela32(view, object, psymval, addend, |
2360 | address); | |
2361 | break; | |
2362 | ||
ee9e9e86 ILT |
2363 | case elfcpp::R_X86_64_PLTOFF64: |
2364 | { | |
2365 | gold_assert(gsym); | |
2366 | gold_assert(gsym->has_plt_offset() | |
2367 | || gsym->final_value_is_known()); | |
2368 | elfcpp::Elf_types<64>::Elf_Addr got_address; | |
2369 | got_address = target->got_section(NULL, NULL)->address(); | |
c1866bd5 ILT |
2370 | Relocate_functions<64, false>::rela64(view, object, psymval, |
2371 | addend - got_address); | |
ee9e9e86 ILT |
2372 | } |
2373 | ||
2e30d253 | 2374 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 ILT |
2375 | gold_assert(have_got_offset); |
2376 | Relocate_functions<64, false>::rela32(view, got_offset, addend); | |
2e30d253 ILT |
2377 | break; |
2378 | ||
e822f2b1 ILT |
2379 | case elfcpp::R_X86_64_GOTPC32: |
2380 | { | |
2381 | gold_assert(gsym); | |
2382 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2383 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2384 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2385 | } | |
2386 | break; | |
2387 | ||
2388 | case elfcpp::R_X86_64_GOT64: | |
2389 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
2390 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 2391 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2392 | gold_assert(have_got_offset); |
2393 | Relocate_functions<64, false>::rela64(view, got_offset, addend); | |
e822f2b1 ILT |
2394 | break; |
2395 | ||
2396 | case elfcpp::R_X86_64_GOTPC64: | |
2397 | { | |
2398 | gold_assert(gsym); | |
2399 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2400 | value = target->got_plt_section()->address(); |
e822f2b1 ILT |
2401 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
2402 | } | |
2403 | break; | |
2404 | ||
2e30d253 ILT |
2405 | case elfcpp::R_X86_64_GOTOFF64: |
2406 | { | |
2407 | elfcpp::Elf_types<64>::Elf_Addr value; | |
2408 | value = (psymval->value(object, 0) | |
96f2030e | 2409 | - target->got_plt_section()->address()); |
2e30d253 ILT |
2410 | Relocate_functions<64, false>::rela64(view, value, addend); |
2411 | } | |
2412 | break; | |
2413 | ||
2414 | case elfcpp::R_X86_64_GOTPCREL: | |
2415 | { | |
0ffd9845 ILT |
2416 | gold_assert(have_got_offset); |
2417 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2418 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2419 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
2420 | } |
2421 | break; | |
2422 | ||
e822f2b1 ILT |
2423 | case elfcpp::R_X86_64_GOTPCREL64: |
2424 | { | |
0ffd9845 ILT |
2425 | gold_assert(have_got_offset); |
2426 | elfcpp::Elf_types<64>::Elf_Addr value; | |
96f2030e | 2427 | value = target->got_plt_section()->address() + got_offset; |
0ffd9845 | 2428 | Relocate_functions<64, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
2429 | } |
2430 | break; | |
2431 | ||
2e30d253 ILT |
2432 | case elfcpp::R_X86_64_COPY: |
2433 | case elfcpp::R_X86_64_GLOB_DAT: | |
2434 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2435 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2436 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2437 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2438 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2439 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2440 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2441 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2442 | _("unexpected reloc %u in object file"), | |
2443 | r_type); | |
2e30d253 ILT |
2444 | break; |
2445 | ||
d61c17ea | 2446 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2447 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2448 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2449 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2450 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2451 | case elfcpp::R_X86_64_DTPOFF32: |
2452 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2453 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2454 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
2455 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2456 | view, address, view_size); | |
2e30d253 | 2457 | break; |
2e30d253 | 2458 | |
fdc2f80f ILT |
2459 | case elfcpp::R_X86_64_SIZE32: |
2460 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2461 | default: |
75f2446e ILT |
2462 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2463 | _("unsupported reloc %u"), | |
2464 | r_type); | |
2e30d253 ILT |
2465 | break; |
2466 | } | |
2467 | ||
2468 | return true; | |
2469 | } | |
2470 | ||
2471 | // Perform a TLS relocation. | |
2472 | ||
2473 | inline void | |
d61c17ea | 2474 | Target_x86_64::Relocate::relocate_tls(const Relocate_info<64, false>* relinfo, |
7bf1f802 | 2475 | Target_x86_64* target, |
d61c17ea | 2476 | size_t relnum, |
72ec2876 | 2477 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2478 | unsigned int r_type, |
2479 | const Sized_symbol<64>* gsym, | |
2480 | const Symbol_value<64>* psymval, | |
2481 | unsigned char* view, | |
6a41d30b | 2482 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2483 | section_size_type view_size) |
2e30d253 | 2484 | { |
2e30d253 | 2485 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 ILT |
2486 | |
2487 | const Sized_relobj<64, false>* object = relinfo->object; | |
6a41d30b | 2488 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
36171d64 CC |
2489 | elfcpp::Shdr<64, false> data_shdr(relinfo->data_shdr); |
2490 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; | |
2e30d253 ILT |
2491 | |
2492 | elfcpp::Elf_types<64>::Elf_Addr value = psymval->value(relinfo->object, 0); | |
2493 | ||
2494 | const bool is_final = (gsym == NULL | |
b3705d2a | 2495 | ? !parameters->options().shared() |
2e30d253 | 2496 | : gsym->final_value_is_known()); |
36171d64 | 2497 | tls::Tls_optimization optimized_type |
e041f13d | 2498 | = Target_x86_64::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2499 | switch (r_type) |
2500 | { | |
56622147 | 2501 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
2502 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2503 | { | |
2504 | // If this code sequence is used in a non-executable section, | |
2505 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
2506 | // on the assumption that it's being used by itself in a debug | |
2507 | // section. Therefore, in the unlikely event that the code | |
2508 | // sequence appears in a non-executable section, we simply | |
2509 | // leave it unoptimized. | |
2510 | optimized_type = tls::TLSOPT_NONE; | |
2511 | } | |
e041f13d | 2512 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 2513 | { |
7bf1f802 | 2514 | gold_assert(tls_segment != NULL); |
2e30d253 | 2515 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 2516 | rela, r_type, value, view, |
2e30d253 ILT |
2517 | view_size); |
2518 | break; | |
2519 | } | |
7bf1f802 ILT |
2520 | else |
2521 | { | |
c2b45e22 CC |
2522 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
2523 | ? GOT_TYPE_TLS_OFFSET | |
2524 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
2525 | unsigned int got_offset; |
2526 | if (gsym != NULL) | |
2527 | { | |
c2b45e22 CC |
2528 | gold_assert(gsym->has_got_offset(got_type)); |
2529 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
2530 | } |
2531 | else | |
2532 | { | |
2533 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
c2b45e22 CC |
2534 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
2535 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
2536 | - target->got_size()); |
2537 | } | |
2538 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2539 | { | |
2540 | gold_assert(tls_segment != NULL); | |
c2b45e22 | 2541 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 2542 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 2543 | value, view, address, view_size); |
7bf1f802 ILT |
2544 | break; |
2545 | } | |
2546 | else if (optimized_type == tls::TLSOPT_NONE) | |
2547 | { | |
2548 | // Relocate the field with the offset of the pair of GOT | |
2549 | // entries. | |
6a41d30b ILT |
2550 | value = target->got_plt_section()->address() + got_offset; |
2551 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2552 | address); | |
7bf1f802 ILT |
2553 | break; |
2554 | } | |
2555 | } | |
72ec2876 | 2556 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2557 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
2558 | break; |
2559 | ||
c2b45e22 CC |
2560 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
2561 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
2562 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2563 | { | |
2564 | // See above comment for R_X86_64_TLSGD. | |
2565 | optimized_type = tls::TLSOPT_NONE; | |
2566 | } | |
c2b45e22 CC |
2567 | if (optimized_type == tls::TLSOPT_TO_LE) |
2568 | { | |
2569 | gold_assert(tls_segment != NULL); | |
2570 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, | |
2571 | rela, r_type, value, view, | |
2572 | view_size); | |
2573 | break; | |
2574 | } | |
2575 | else | |
2576 | { | |
2577 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
2578 | ? GOT_TYPE_TLS_OFFSET | |
2579 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
2580 | unsigned int got_offset = 0; |
2581 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC | |
2582 | && optimized_type == tls::TLSOPT_NONE) | |
2583 | { | |
2584 | // We created GOT entries in the .got.tlsdesc portion of | |
2585 | // the .got.plt section, but the offset stored in the | |
2586 | // symbol is the offset within .got.tlsdesc. | |
2587 | got_offset = (target->got_size() | |
2588 | + target->got_plt_section()->data_size()); | |
2589 | } | |
c2b45e22 CC |
2590 | if (gsym != NULL) |
2591 | { | |
2592 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 2593 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
2594 | } |
2595 | else | |
2596 | { | |
2597 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
2598 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
a8df5856 ILT |
2599 | got_offset += (object->local_got_offset(r_sym, got_type) |
2600 | - target->got_size()); | |
c2b45e22 CC |
2601 | } |
2602 | if (optimized_type == tls::TLSOPT_TO_IE) | |
2603 | { | |
2604 | gold_assert(tls_segment != NULL); | |
2605 | value = target->got_plt_section()->address() + got_offset; | |
2606 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
2607 | rela, r_type, value, view, address, | |
2608 | view_size); | |
2609 | break; | |
2610 | } | |
2611 | else if (optimized_type == tls::TLSOPT_NONE) | |
2612 | { | |
2613 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2614 | { | |
2615 | // Relocate the field with the offset of the pair of GOT | |
2616 | // entries. | |
2617 | value = target->got_plt_section()->address() + got_offset; | |
2618 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2619 | address); | |
2620 | } | |
2621 | break; | |
2622 | } | |
2623 | } | |
2624 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
2625 | _("unsupported reloc %u"), r_type); | |
2626 | break; | |
2627 | ||
56622147 | 2628 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
2629 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
2630 | { | |
2631 | // See above comment for R_X86_64_TLSGD. | |
2632 | optimized_type = tls::TLSOPT_NONE; | |
2633 | } | |
e041f13d ILT |
2634 | if (optimized_type == tls::TLSOPT_TO_LE) |
2635 | { | |
7bf1f802 | 2636 | gold_assert(tls_segment != NULL); |
72ec2876 ILT |
2637 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
2638 | value, view, view_size); | |
2639 | break; | |
e041f13d | 2640 | } |
7bf1f802 ILT |
2641 | else if (optimized_type == tls::TLSOPT_NONE) |
2642 | { | |
2643 | // Relocate the field with the offset of the GOT entry for | |
2644 | // the module index. | |
2645 | unsigned int got_offset; | |
31d60480 ILT |
2646 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
2647 | - target->got_size()); | |
6a41d30b ILT |
2648 | value = target->got_plt_section()->address() + got_offset; |
2649 | Relocate_functions<64, false>::pcrela32(view, value, addend, | |
2650 | address); | |
7bf1f802 ILT |
2651 | break; |
2652 | } | |
72ec2876 | 2653 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 2654 | _("unsupported reloc %u"), r_type); |
2e30d253 | 2655 | break; |
0ffd9845 ILT |
2656 | |
2657 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
2658 | // This relocation type is used in debugging information. |
2659 | // In that case we need to not optimize the value. If the | |
2660 | // section is not executable, then we assume we should not | |
2661 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
2662 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
2663 | // R_X86_64_TLSLD. | |
2664 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
2665 | { | |
2666 | gold_assert(tls_segment != NULL); | |
2667 | value -= tls_segment->memsz(); | |
2668 | } | |
d85c80a3 | 2669 | Relocate_functions<64, false>::rela32(view, value, addend); |
0ffd9845 ILT |
2670 | break; |
2671 | ||
2672 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
2673 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
2674 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
2675 | { | |
2676 | gold_assert(tls_segment != NULL); | |
2677 | value -= tls_segment->memsz(); | |
2678 | } | |
d85c80a3 | 2679 | Relocate_functions<64, false>::rela64(view, value, addend); |
0ffd9845 | 2680 | break; |
2e30d253 | 2681 | |
56622147 ILT |
2682 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2683 | if (optimized_type == tls::TLSOPT_TO_LE) | |
2684 | { | |
7bf1f802 | 2685 | gold_assert(tls_segment != NULL); |
56622147 ILT |
2686 | Target_x86_64::Relocate::tls_ie_to_le(relinfo, relnum, tls_segment, |
2687 | rela, r_type, value, view, | |
2688 | view_size); | |
2689 | break; | |
2690 | } | |
7bf1f802 ILT |
2691 | else if (optimized_type == tls::TLSOPT_NONE) |
2692 | { | |
2693 | // Relocate the field with the offset of the GOT entry for | |
2694 | // the tp-relative offset of the symbol. | |
2695 | unsigned int got_offset; | |
2696 | if (gsym != NULL) | |
2697 | { | |
0a65a3a7 CC |
2698 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
2699 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
2700 | - target->got_size()); | |
7bf1f802 ILT |
2701 | } |
2702 | else | |
2703 | { | |
2704 | unsigned int r_sym = elfcpp::elf_r_sym<64>(rela.get_r_info()); | |
0a65a3a7 CC |
2705 | gold_assert(object->local_has_got_offset(r_sym, |
2706 | GOT_TYPE_TLS_OFFSET)); | |
2707 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
2708 | - target->got_size()); |
2709 | } | |
6a41d30b ILT |
2710 | value = target->got_plt_section()->address() + got_offset; |
2711 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
7bf1f802 ILT |
2712 | break; |
2713 | } | |
56622147 ILT |
2714 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2715 | _("unsupported reloc type %u"), | |
2716 | r_type); | |
2717 | break; | |
0ffd9845 | 2718 | |
56622147 | 2719 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
6a41d30b | 2720 | value -= tls_segment->memsz(); |
d85c80a3 | 2721 | Relocate_functions<64, false>::rela32(view, value, addend); |
56622147 | 2722 | break; |
2e30d253 | 2723 | } |
2e30d253 ILT |
2724 | } |
2725 | ||
7bf1f802 ILT |
2726 | // Do a relocation in which we convert a TLS General-Dynamic to an |
2727 | // Initial-Exec. | |
2728 | ||
2729 | inline void | |
2730 | Target_x86_64::Relocate::tls_gd_to_ie(const Relocate_info<64, false>* relinfo, | |
2731 | size_t relnum, | |
c2b45e22 | 2732 | Output_segment*, |
7bf1f802 ILT |
2733 | const elfcpp::Rela<64, false>& rela, |
2734 | unsigned int, | |
2735 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2736 | unsigned char* view, | |
c2b45e22 | 2737 | elfcpp::Elf_types<64>::Elf_Addr address, |
fe8718a4 | 2738 | section_size_type view_size) |
7bf1f802 ILT |
2739 | { |
2740 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
2741 | // .word 0x6666; rex64; call __tls_get_addr | |
2742 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
2743 | ||
2744 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
2745 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2746 | ||
2747 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2748 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2749 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2750 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2751 | ||
2752 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
2753 | ||
c2b45e22 CC |
2754 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2755 | Relocate_functions<64, false>::pcrela32(view + 8, value, addend - 8, address); | |
7bf1f802 ILT |
2756 | |
2757 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2758 | // We can skip it. | |
2759 | this->skip_call_tls_get_addr_ = true; | |
2760 | } | |
2761 | ||
e041f13d | 2762 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
2763 | // Local-Exec. |
2764 | ||
2765 | inline void | |
d61c17ea ILT |
2766 | Target_x86_64::Relocate::tls_gd_to_le(const Relocate_info<64, false>* relinfo, |
2767 | size_t relnum, | |
2768 | Output_segment* tls_segment, | |
72ec2876 | 2769 | const elfcpp::Rela<64, false>& rela, |
d61c17ea ILT |
2770 | unsigned int, |
2771 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2772 | unsigned char* view, | |
fe8718a4 | 2773 | section_size_type view_size) |
2e30d253 | 2774 | { |
0ffd9845 ILT |
2775 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
2776 | // .word 0x6666; rex64; call __tls_get_addr | |
2777 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 2778 | |
72ec2876 ILT |
2779 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
2780 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 2781 | |
72ec2876 ILT |
2782 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2783 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
2784 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2785 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 2786 | |
0ffd9845 | 2787 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 2788 | |
6a41d30b | 2789 | value -= tls_segment->memsz(); |
0ffd9845 | 2790 | Relocate_functions<64, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
2791 | |
2792 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2793 | // We can skip it. | |
2794 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2795 | } |
2796 | ||
c2b45e22 CC |
2797 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
2798 | ||
2799 | inline void | |
2800 | Target_x86_64::Relocate::tls_desc_gd_to_ie( | |
2801 | const Relocate_info<64, false>* relinfo, | |
2802 | size_t relnum, | |
2803 | Output_segment*, | |
2804 | const elfcpp::Rela<64, false>& rela, | |
2805 | unsigned int r_type, | |
2806 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2807 | unsigned char* view, | |
2808 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2809 | section_size_type view_size) | |
2810 | { | |
2811 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2812 | { | |
2813 | // leaq foo@tlsdesc(%rip), %rax | |
2814 | // ==> movq foo@gottpoff(%rip), %rax | |
2815 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2816 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2817 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2818 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2819 | view[-2] = 0x8b; | |
2820 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
2821 | Relocate_functions<64, false>::pcrela32(view, value, addend, address); | |
2822 | } | |
2823 | else | |
2824 | { | |
2825 | // call *foo@tlscall(%rax) | |
2826 | // ==> nop; nop | |
2827 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2828 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2829 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2830 | view[0] == 0xff && view[1] == 0x10); | |
2831 | view[0] = 0x66; | |
2832 | view[1] = 0x90; | |
2833 | } | |
2834 | } | |
2835 | ||
2836 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
2837 | ||
2838 | inline void | |
2839 | Target_x86_64::Relocate::tls_desc_gd_to_le( | |
2840 | const Relocate_info<64, false>* relinfo, | |
2841 | size_t relnum, | |
2842 | Output_segment* tls_segment, | |
2843 | const elfcpp::Rela<64, false>& rela, | |
2844 | unsigned int r_type, | |
2845 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2846 | unsigned char* view, | |
2847 | section_size_type view_size) | |
2848 | { | |
2849 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
2850 | { | |
2851 | // leaq foo@tlsdesc(%rip), %rax | |
2852 | // ==> movq foo@tpoff, %rax | |
2853 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2854 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2855 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2856 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
2857 | view[-2] = 0xc7; | |
2858 | view[-1] = 0xc0; | |
2859 | value -= tls_segment->memsz(); | |
2860 | Relocate_functions<64, false>::rela32(view, value, 0); | |
2861 | } | |
2862 | else | |
2863 | { | |
2864 | // call *foo@tlscall(%rax) | |
2865 | // ==> nop; nop | |
2866 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
2867 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
2868 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2869 | view[0] == 0xff && view[1] == 0x10); | |
2870 | view[0] = 0x66; | |
2871 | view[1] = 0x90; | |
2872 | } | |
2873 | } | |
2874 | ||
2e30d253 | 2875 | inline void |
72ec2876 ILT |
2876 | Target_x86_64::Relocate::tls_ld_to_le(const Relocate_info<64, false>* relinfo, |
2877 | size_t relnum, | |
2878 | Output_segment*, | |
2879 | const elfcpp::Rela<64, false>& rela, | |
2880 | unsigned int, | |
2881 | elfcpp::Elf_types<64>::Elf_Addr, | |
2882 | unsigned char* view, | |
fe8718a4 | 2883 | section_size_type view_size) |
2e30d253 | 2884 | { |
72ec2876 ILT |
2885 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
2886 | // ... leq foo@dtpoff(%rax),%reg | |
2887 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 2888 | |
72ec2876 ILT |
2889 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
2890 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 2891 | |
72ec2876 ILT |
2892 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2893 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
2894 | ||
2895 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
2896 | ||
2897 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
2898 | ||
2899 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
2900 | // We can skip it. | |
2901 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
2902 | } |
2903 | ||
56622147 ILT |
2904 | // Do a relocation in which we convert a TLS Initial-Exec to a |
2905 | // Local-Exec. | |
2906 | ||
2907 | inline void | |
2908 | Target_x86_64::Relocate::tls_ie_to_le(const Relocate_info<64, false>* relinfo, | |
2909 | size_t relnum, | |
2910 | Output_segment* tls_segment, | |
2911 | const elfcpp::Rela<64, false>& rela, | |
2912 | unsigned int, | |
2913 | elfcpp::Elf_types<64>::Elf_Addr value, | |
2914 | unsigned char* view, | |
fe8718a4 | 2915 | section_size_type view_size) |
56622147 ILT |
2916 | { |
2917 | // We need to examine the opcodes to figure out which instruction we | |
2918 | // are looking at. | |
2919 | ||
2920 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
2921 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
2922 | ||
2923 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
2924 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
2925 | ||
2926 | unsigned char op1 = view[-3]; | |
2927 | unsigned char op2 = view[-2]; | |
2928 | unsigned char op3 = view[-1]; | |
2929 | unsigned char reg = op3 >> 3; | |
2930 | ||
2931 | if (op2 == 0x8b) | |
2932 | { | |
2933 | // movq | |
2934 | if (op1 == 0x4c) | |
2935 | view[-3] = 0x49; | |
2936 | view[-2] = 0xc7; | |
2937 | view[-1] = 0xc0 | reg; | |
2938 | } | |
2939 | else if (reg == 4) | |
2940 | { | |
2941 | // Special handling for %rsp. | |
2942 | if (op1 == 0x4c) | |
2943 | view[-3] = 0x49; | |
2944 | view[-2] = 0x81; | |
2945 | view[-1] = 0xc0 | reg; | |
2946 | } | |
2947 | else | |
2948 | { | |
2949 | // addq | |
2950 | if (op1 == 0x4c) | |
2951 | view[-3] = 0x4d; | |
2952 | view[-2] = 0x8d; | |
2953 | view[-1] = 0x80 | reg | (reg << 3); | |
2954 | } | |
2955 | ||
6a41d30b | 2956 | value -= tls_segment->memsz(); |
56622147 ILT |
2957 | Relocate_functions<64, false>::rela32(view, value, 0); |
2958 | } | |
2959 | ||
2e30d253 ILT |
2960 | // Relocate section data. |
2961 | ||
2962 | void | |
364c7fa5 ILT |
2963 | Target_x86_64::relocate_section( |
2964 | const Relocate_info<64, false>* relinfo, | |
2965 | unsigned int sh_type, | |
2966 | const unsigned char* prelocs, | |
2967 | size_t reloc_count, | |
2968 | Output_section* output_section, | |
2969 | bool needs_special_offset_handling, | |
2970 | unsigned char* view, | |
2971 | elfcpp::Elf_types<64>::Elf_Addr address, | |
2972 | section_size_type view_size, | |
2973 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
2974 | { |
2975 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
2976 | ||
2977 | gold::relocate_section<64, false, Target_x86_64, elfcpp::SHT_RELA, | |
2978 | Target_x86_64::Relocate>( | |
2979 | relinfo, | |
2980 | this, | |
2981 | prelocs, | |
2982 | reloc_count, | |
730cdc88 ILT |
2983 | output_section, |
2984 | needs_special_offset_handling, | |
2e30d253 ILT |
2985 | view, |
2986 | address, | |
364c7fa5 ILT |
2987 | view_size, |
2988 | reloc_symbol_changes); | |
2e30d253 ILT |
2989 | } |
2990 | ||
6a74a719 ILT |
2991 | // Return the size of a relocation while scanning during a relocatable |
2992 | // link. | |
2993 | ||
2994 | unsigned int | |
2995 | Target_x86_64::Relocatable_size_for_reloc::get_size_for_reloc( | |
2996 | unsigned int r_type, | |
2997 | Relobj* object) | |
2998 | { | |
2999 | switch (r_type) | |
3000 | { | |
3001 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3002 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3003 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
3004 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3005 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
3006 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
3007 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
3008 | case elfcpp::R_X86_64_DTPOFF32: | |
3009 | case elfcpp::R_X86_64_DTPOFF64: | |
3010 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
3011 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
3012 | return 0; | |
3013 | ||
3014 | case elfcpp::R_X86_64_64: | |
3015 | case elfcpp::R_X86_64_PC64: | |
3016 | case elfcpp::R_X86_64_GOTOFF64: | |
3017 | case elfcpp::R_X86_64_GOTPC64: | |
3018 | case elfcpp::R_X86_64_PLTOFF64: | |
3019 | case elfcpp::R_X86_64_GOT64: | |
3020 | case elfcpp::R_X86_64_GOTPCREL64: | |
3021 | case elfcpp::R_X86_64_GOTPCREL: | |
3022 | case elfcpp::R_X86_64_GOTPLT64: | |
3023 | return 8; | |
3024 | ||
3025 | case elfcpp::R_X86_64_32: | |
3026 | case elfcpp::R_X86_64_32S: | |
3027 | case elfcpp::R_X86_64_PC32: | |
3028 | case elfcpp::R_X86_64_PLT32: | |
3029 | case elfcpp::R_X86_64_GOTPC32: | |
3030 | case elfcpp::R_X86_64_GOT32: | |
3031 | return 4; | |
3032 | ||
3033 | case elfcpp::R_X86_64_16: | |
3034 | case elfcpp::R_X86_64_PC16: | |
3035 | return 2; | |
3036 | ||
3037 | case elfcpp::R_X86_64_8: | |
3038 | case elfcpp::R_X86_64_PC8: | |
3039 | return 1; | |
3040 | ||
3041 | case elfcpp::R_X86_64_COPY: | |
3042 | case elfcpp::R_X86_64_GLOB_DAT: | |
3043 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3044 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3045 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
3046 | // These are outstanding tls relocs, which are unexpected when linking |
3047 | case elfcpp::R_X86_64_TPOFF64: | |
3048 | case elfcpp::R_X86_64_DTPMOD64: | |
3049 | case elfcpp::R_X86_64_TLSDESC: | |
3050 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3051 | return 0; | |
3052 | ||
3053 | case elfcpp::R_X86_64_SIZE32: | |
3054 | case elfcpp::R_X86_64_SIZE64: | |
3055 | default: | |
3056 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
3057 | return 0; | |
3058 | } | |
3059 | } | |
3060 | ||
3061 | // Scan the relocs during a relocatable link. | |
3062 | ||
3063 | void | |
ad0f2072 | 3064 | Target_x86_64::scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 ILT |
3065 | Layout* layout, |
3066 | Sized_relobj<64, false>* object, | |
3067 | unsigned int data_shndx, | |
3068 | unsigned int sh_type, | |
3069 | const unsigned char* prelocs, | |
3070 | size_t reloc_count, | |
3071 | Output_section* output_section, | |
3072 | bool needs_special_offset_handling, | |
3073 | size_t local_symbol_count, | |
3074 | const unsigned char* plocal_symbols, | |
3075 | Relocatable_relocs* rr) | |
3076 | { | |
3077 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3078 | ||
3079 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
3080 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3081 | ||
7019cd25 | 3082 | gold::scan_relocatable_relocs<64, false, elfcpp::SHT_RELA, |
6a74a719 | 3083 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3084 | symtab, |
3085 | layout, | |
3086 | object, | |
3087 | data_shndx, | |
3088 | prelocs, | |
3089 | reloc_count, | |
3090 | output_section, | |
3091 | needs_special_offset_handling, | |
3092 | local_symbol_count, | |
3093 | plocal_symbols, | |
3094 | rr); | |
3095 | } | |
3096 | ||
3097 | // Relocate a section during a relocatable link. | |
3098 | ||
3099 | void | |
3100 | Target_x86_64::relocate_for_relocatable( | |
3101 | const Relocate_info<64, false>* relinfo, | |
3102 | unsigned int sh_type, | |
3103 | const unsigned char* prelocs, | |
3104 | size_t reloc_count, | |
3105 | Output_section* output_section, | |
3106 | off_t offset_in_output_section, | |
3107 | const Relocatable_relocs* rr, | |
3108 | unsigned char* view, | |
3109 | elfcpp::Elf_types<64>::Elf_Addr view_address, | |
3110 | section_size_type view_size, | |
3111 | unsigned char* reloc_view, | |
3112 | section_size_type reloc_view_size) | |
3113 | { | |
3114 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3115 | ||
7019cd25 | 3116 | gold::relocate_for_relocatable<64, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
3117 | relinfo, |
3118 | prelocs, | |
3119 | reloc_count, | |
3120 | output_section, | |
3121 | offset_in_output_section, | |
3122 | rr, | |
3123 | view, | |
3124 | view_address, | |
3125 | view_size, | |
3126 | reloc_view, | |
3127 | reloc_view_size); | |
3128 | } | |
3129 | ||
4fb6c25d ILT |
3130 | // Return the value to use for a dynamic which requires special |
3131 | // treatment. This is how we support equality comparisons of function | |
3132 | // pointers across shared library boundaries, as described in the | |
3133 | // processor specific ABI supplement. | |
3134 | ||
3135 | uint64_t | |
3136 | Target_x86_64::do_dynsym_value(const Symbol* gsym) const | |
3137 | { | |
3138 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
3139 | return this->plt_section()->address() + gsym->plt_offset(); | |
3140 | } | |
3141 | ||
2e30d253 ILT |
3142 | // Return a string used to fill a code section with nops to take up |
3143 | // the specified length. | |
3144 | ||
3145 | std::string | |
8851ecca | 3146 | Target_x86_64::do_code_fill(section_size_type length) const |
2e30d253 ILT |
3147 | { |
3148 | if (length >= 16) | |
3149 | { | |
3150 | // Build a jmpq instruction to skip over the bytes. | |
3151 | unsigned char jmp[5]; | |
3152 | jmp[0] = 0xe9; | |
04bf7072 | 3153 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
3154 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
3155 | + std::string(length - 5, '\0')); | |
3156 | } | |
3157 | ||
3158 | // Nop sequences of various lengths. | |
3159 | const char nop1[1] = { 0x90 }; // nop | |
3160 | const char nop2[2] = { 0x66, 0x90 }; // xchg %ax %ax | |
1caf2c51 ILT |
3161 | const char nop3[3] = { 0x0f, 0x1f, 0x00 }; // nop (%rax) |
3162 | const char nop4[4] = { 0x0f, 0x1f, 0x40, 0x00}; // nop 0(%rax) | |
3163 | const char nop5[5] = { 0x0f, 0x1f, 0x44, 0x00, // nop 0(%rax,%rax,1) | |
3164 | 0x00 }; | |
3165 | const char nop6[6] = { 0x66, 0x0f, 0x1f, 0x44, // nopw 0(%rax,%rax,1) | |
2e30d253 | 3166 | 0x00, 0x00 }; |
1caf2c51 | 3167 | const char nop7[7] = { 0x0f, 0x1f, 0x80, 0x00, // nopl 0L(%rax) |
2e30d253 | 3168 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3169 | const char nop8[8] = { 0x0f, 0x1f, 0x84, 0x00, // nopl 0L(%rax,%rax,1) |
3170 | 0x00, 0x00, 0x00, 0x00 }; | |
3171 | const char nop9[9] = { 0x66, 0x0f, 0x1f, 0x84, // nopw 0L(%rax,%rax,1) | |
3172 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 3173 | 0x00 }; |
1caf2c51 ILT |
3174 | const char nop10[10] = { 0x66, 0x2e, 0x0f, 0x1f, // nopw %cs:0L(%rax,%rax,1) |
3175 | 0x84, 0x00, 0x00, 0x00, | |
2e30d253 | 3176 | 0x00, 0x00 }; |
1caf2c51 ILT |
3177 | const char nop11[11] = { 0x66, 0x66, 0x2e, 0x0f, // data16 |
3178 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3179 | 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3180 | const char nop12[12] = { 0x66, 0x66, 0x66, 0x2e, // data16; data16 |
3181 | 0x0f, 0x1f, 0x84, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3182 | 0x00, 0x00, 0x00, 0x00 }; |
1caf2c51 ILT |
3183 | const char nop13[13] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3184 | 0x2e, 0x0f, 0x1f, 0x84, // nopw %cs:0L(%rax,%rax,1) | |
3185 | 0x00, 0x00, 0x00, 0x00, | |
2e30d253 | 3186 | 0x00 }; |
1caf2c51 ILT |
3187 | const char nop14[14] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3188 | 0x66, 0x2e, 0x0f, 0x1f, // data16 | |
3189 | 0x84, 0x00, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
2e30d253 | 3190 | 0x00, 0x00 }; |
1caf2c51 ILT |
3191 | const char nop15[15] = { 0x66, 0x66, 0x66, 0x66, // data16; data16; data16 |
3192 | 0x66, 0x66, 0x2e, 0x0f, // data16; data16 | |
3193 | 0x1f, 0x84, 0x00, 0x00, // nopw %cs:0L(%rax,%rax,1) | |
3194 | 0x00, 0x00, 0x00 }; | |
2e30d253 ILT |
3195 | |
3196 | const char* nops[16] = { | |
3197 | NULL, | |
3198 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
3199 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
3200 | }; | |
3201 | ||
3202 | return std::string(nops[length], length); | |
3203 | } | |
3204 | ||
e291e7b9 ILT |
3205 | // Return the addend to use for a target specific relocation. The |
3206 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
3207 | // symbol. We want to set the addend is the offset of the local | |
3208 | // symbol in the TLS segment. | |
3209 | ||
3210 | uint64_t | |
3211 | Target_x86_64::do_reloc_addend(void* arg, unsigned int r_type, | |
3212 | uint64_t) const | |
3213 | { | |
3214 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
3215 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
3216 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
3217 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
3218 | const Symbol_value<64>* psymval = ti.object->local_symbol(ti.r_sym); | |
3219 | gold_assert(psymval->is_tls_symbol()); | |
3220 | // The value of a TLS symbol is the offset in the TLS segment. | |
3221 | return psymval->value(ti.object, 0); | |
3222 | } | |
3223 | ||
364c7fa5 ILT |
3224 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
3225 | // compiled with -fstack-split. The function calls non-stack-split | |
3226 | // code. We have to change the function so that it always ensures | |
3227 | // that it has enough stack space to run some random function. | |
3228 | ||
3229 | void | |
3230 | Target_x86_64::do_calls_non_split(Relobj* object, unsigned int shndx, | |
3231 | section_offset_type fnoffset, | |
3232 | section_size_type fnsize, | |
3233 | unsigned char* view, | |
3234 | section_size_type view_size, | |
3235 | std::string* from, | |
3236 | std::string* to) const | |
3237 | { | |
3238 | // The function starts with a comparison of the stack pointer and a | |
3239 | // field in the TCB. This is followed by a jump. | |
3240 | ||
3241 | // cmp %fs:NN,%rsp | |
3242 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
3243 | && fnsize > 9) | |
3244 | { | |
3245 | // We will call __morestack if the carry flag is set after this | |
3246 | // comparison. We turn the comparison into an stc instruction | |
3247 | // and some nops. | |
3248 | view[fnoffset] = '\xf9'; | |
3249 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
3250 | } | |
3251 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
3252 | // lea NN(%rsp),%r11 |
3253 | else if ((this->match_view(view, view_size, fnoffset, | |
3254 | "\x4c\x8d\x94\x24", 4) | |
3255 | || this->match_view(view, view_size, fnoffset, | |
3256 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
3257 | && fnsize > 8) |
3258 | { | |
3259 | // This is loading an offset from the stack pointer for a | |
3260 | // comparison. The offset is negative, so we decrease the | |
3261 | // offset by the amount of space we need for the stack. This | |
3262 | // means we will avoid calling __morestack if there happens to | |
3263 | // be plenty of space on the stack already. | |
3264 | unsigned char* pval = view + fnoffset + 4; | |
3265 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
3266 | val -= parameters->options().split_stack_adjust_size(); | |
3267 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
3268 | } | |
3269 | else | |
3270 | { | |
3271 | if (!object->has_no_split_stack()) | |
3272 | object->error(_("failed to match split-stack sequence at " | |
3273 | "section %u offset %0zx"), | |
ac33a407 | 3274 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
3275 | return; |
3276 | } | |
3277 | ||
3278 | // We have to change the function so that it calls | |
3279 | // __morestack_non_split instead of __morestack. The former will | |
3280 | // allocate additional stack space. | |
3281 | *from = "__morestack"; | |
3282 | *to = "__morestack_non_split"; | |
3283 | } | |
3284 | ||
2e30d253 ILT |
3285 | // The selector for x86_64 object files. |
3286 | ||
36959681 | 3287 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
3288 | { |
3289 | public: | |
3290 | Target_selector_x86_64() | |
36959681 ILT |
3291 | : Target_selector_freebsd(elfcpp::EM_X86_64, 64, false, "elf64-x86-64", |
3292 | "elf64-x86-64-freebsd") | |
2e30d253 ILT |
3293 | { } |
3294 | ||
3295 | Target* | |
e96caa79 ILT |
3296 | do_instantiate_target() |
3297 | { return new Target_x86_64(); } | |
36959681 | 3298 | |
2e30d253 ILT |
3299 | }; |
3300 | ||
2e30d253 ILT |
3301 | Target_selector_x86_64 target_selector_x86_64; |
3302 | ||
3303 | } // End anonymous namespace. |