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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
d87bef3a | 3 | // Copyright (C) 2006-2023 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" | |
07a60597 | 28 | #include "dwarf.h" |
2e30d253 ILT |
29 | #include "parameters.h" |
30 | #include "reloc.h" | |
31 | #include "x86_64.h" | |
32 | #include "object.h" | |
33 | #include "symtab.h" | |
34 | #include "layout.h" | |
35 | #include "output.h" | |
12c0daef | 36 | #include "copy-relocs.h" |
2e30d253 ILT |
37 | #include "target.h" |
38 | #include "target-reloc.h" | |
39 | #include "target-select.h" | |
e041f13d | 40 | #include "tls.h" |
36959681 | 41 | #include "freebsd.h" |
2e702c99 | 42 | #include "nacl.h" |
f345227a | 43 | #include "gc.h" |
21bb3914 | 44 | #include "icf.h" |
2e30d253 ILT |
45 | |
46 | namespace | |
47 | { | |
48 | ||
49 | using namespace gold; | |
50 | ||
57b2284c CC |
51 | // A class to handle the .got.plt section. |
52 | ||
53 | class Output_data_got_plt_x86_64 : public Output_section_data_build | |
54 | { | |
55 | public: | |
56 | Output_data_got_plt_x86_64(Layout* layout) | |
57 | : Output_section_data_build(8), | |
58 | layout_(layout) | |
59 | { } | |
60 | ||
61 | Output_data_got_plt_x86_64(Layout* layout, off_t data_size) | |
62 | : Output_section_data_build(data_size, 8), | |
63 | layout_(layout) | |
64 | { } | |
65 | ||
66 | protected: | |
67 | // Write out the PLT data. | |
68 | void | |
69 | do_write(Output_file*); | |
70 | ||
71 | // Write to a map file. | |
72 | void | |
73 | do_print_to_mapfile(Mapfile* mapfile) const | |
74 | { mapfile->print_output_data(this, "** GOT PLT"); } | |
75 | ||
76 | private: | |
77 | // A pointer to the Layout class, so that we can find the .dynamic | |
78 | // section when we write out the GOT PLT section. | |
79 | Layout* layout_; | |
80 | }; | |
81 | ||
7223e9ca | 82 | // A class to handle the PLT data. |
2e702c99 RM |
83 | // This is an abstract base class that handles most of the linker details |
84 | // but does not know the actual contents of PLT entries. The derived | |
85 | // classes below fill in those details. | |
7223e9ca | 86 | |
fc51264f | 87 | template<int size> |
7223e9ca ILT |
88 | class Output_data_plt_x86_64 : public Output_section_data |
89 | { | |
90 | public: | |
fc51264f | 91 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
7223e9ca | 92 | |
2e702c99 RM |
93 | Output_data_plt_x86_64(Layout* layout, uint64_t addralign, |
94 | Output_data_got<64, false>* got, | |
57b2284c | 95 | Output_data_got_plt_x86_64* got_plt, |
67181c72 | 96 | Output_data_space* got_irelative) |
57b2284c | 97 | : Output_section_data(addralign), tlsdesc_rel_(NULL), |
7d172687 ILT |
98 | irelative_rel_(NULL), got_(got), got_plt_(got_plt), |
99 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
100 | tlsdesc_got_offset_(-1U), free_list_() | |
67181c72 ILT |
101 | { this->init(layout); } |
102 | ||
2e702c99 RM |
103 | Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size, |
104 | Output_data_got<64, false>* got, | |
57b2284c | 105 | Output_data_got_plt_x86_64* got_plt, |
67181c72 | 106 | Output_data_space* got_irelative, |
4829d394 | 107 | unsigned int plt_count) |
2e702c99 RM |
108 | : Output_section_data((plt_count + 1) * plt_entry_size, |
109 | plt_entry_size, false), | |
57b2284c | 110 | tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got), |
7d172687 ILT |
111 | got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count), |
112 | irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_() | |
4829d394 | 113 | { |
67181c72 | 114 | this->init(layout); |
4829d394 CC |
115 | |
116 | // Initialize the free list and reserve the first entry. | |
117 | this->free_list_.init((plt_count + 1) * plt_entry_size, false); | |
118 | this->free_list_.remove(0, plt_entry_size); | |
119 | } | |
120 | ||
121 | // Initialize the PLT section. | |
122 | void | |
67181c72 | 123 | init(Layout* layout); |
7223e9ca ILT |
124 | |
125 | // Add an entry to the PLT. | |
126 | void | |
67181c72 | 127 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
128 | |
129 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
130 | unsigned int | |
67181c72 | 131 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, |
fc51264f | 132 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
133 | unsigned int local_sym_index); |
134 | ||
4829d394 CC |
135 | // Add the relocation for a PLT entry. |
136 | void | |
67181c72 ILT |
137 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, |
138 | unsigned int got_offset); | |
4829d394 | 139 | |
7223e9ca ILT |
140 | // Add the reserved TLSDESC_PLT entry to the PLT. |
141 | void | |
142 | reserve_tlsdesc_entry(unsigned int got_offset) | |
143 | { this->tlsdesc_got_offset_ = got_offset; } | |
144 | ||
145 | // Return true if a TLSDESC_PLT entry has been reserved. | |
146 | bool | |
147 | has_tlsdesc_entry() const | |
148 | { return this->tlsdesc_got_offset_ != -1U; } | |
149 | ||
150 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
151 | unsigned int | |
152 | get_tlsdesc_got_offset() const | |
153 | { return this->tlsdesc_got_offset_; } | |
154 | ||
155 | // Return the offset of the reserved TLSDESC_PLT entry. | |
156 | unsigned int | |
157 | get_tlsdesc_plt_offset() const | |
2e702c99 RM |
158 | { |
159 | return ((this->count_ + this->irelative_count_ + 1) | |
160 | * this->get_plt_entry_size()); | |
161 | } | |
7223e9ca ILT |
162 | |
163 | // Return the .rela.plt section data. | |
164 | Reloc_section* | |
165 | rela_plt() | |
166 | { return this->rel_; } | |
167 | ||
168 | // Return where the TLSDESC relocations should go. | |
169 | Reloc_section* | |
170 | rela_tlsdesc(Layout*); | |
171 | ||
67181c72 ILT |
172 | // Return where the IRELATIVE relocations should go in the PLT |
173 | // relocations. | |
174 | Reloc_section* | |
175 | rela_irelative(Symbol_table*, Layout*); | |
176 | ||
177 | // Return whether we created a section for IRELATIVE relocations. | |
178 | bool | |
179 | has_irelative_section() const | |
180 | { return this->irelative_rel_ != NULL; } | |
181 | ||
7a0c0a14 CC |
182 | // Get count of regular PLT entries. |
183 | unsigned int | |
184 | regular_count() const | |
185 | { return this->count_; } | |
186 | ||
187 | // Return the total number of PLT entries. | |
7223e9ca ILT |
188 | unsigned int |
189 | entry_count() const | |
67181c72 | 190 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
191 | |
192 | // Return the offset of the first non-reserved PLT entry. | |
2e702c99 | 193 | unsigned int |
7223e9ca | 194 | first_plt_entry_offset() |
2e702c99 | 195 | { return this->get_plt_entry_size(); } |
7223e9ca ILT |
196 | |
197 | // Return the size of a PLT entry. | |
2e702c99 RM |
198 | unsigned int |
199 | get_plt_entry_size() const | |
200 | { return this->do_get_plt_entry_size(); } | |
7223e9ca | 201 | |
4829d394 CC |
202 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
203 | void | |
204 | reserve_slot(unsigned int plt_index) | |
205 | { | |
2e702c99 RM |
206 | this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(), |
207 | (plt_index + 2) * this->get_plt_entry_size()); | |
4829d394 CC |
208 | } |
209 | ||
67181c72 ILT |
210 | // Return the PLT address to use for a global symbol. |
211 | uint64_t | |
7a0c0a14 CC |
212 | address_for_global(const Symbol* sym) |
213 | { return do_address_for_global(sym); } | |
67181c72 ILT |
214 | |
215 | // Return the PLT address to use for a local symbol. | |
216 | uint64_t | |
7a0c0a14 CC |
217 | address_for_local(const Relobj* obj, unsigned int symndx) |
218 | { return do_address_for_local(obj, symndx); } | |
67181c72 | 219 | |
2e702c99 RM |
220 | // Add .eh_frame information for the PLT. |
221 | void | |
222 | add_eh_frame(Layout* layout) | |
223 | { this->do_add_eh_frame(layout); } | |
224 | ||
7223e9ca | 225 | protected: |
7a0c0a14 CC |
226 | Output_data_got<64, false>* |
227 | got() const | |
228 | { return this->got_; } | |
229 | ||
230 | Output_data_got_plt_x86_64* | |
231 | got_plt() const | |
232 | { return this->got_plt_; } | |
233 | ||
234 | Output_data_space* | |
235 | got_irelative() const | |
236 | { return this->got_irelative_; } | |
237 | ||
2e702c99 RM |
238 | // Fill in the first PLT entry. |
239 | void | |
240 | fill_first_plt_entry(unsigned char* pov, | |
241 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
242 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
243 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } | |
244 | ||
245 | // Fill in a normal PLT entry. Returns the offset into the entry that | |
246 | // should be the initial GOT slot value. | |
247 | unsigned int | |
248 | fill_plt_entry(unsigned char* pov, | |
249 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
250 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
251 | unsigned int got_offset, | |
252 | unsigned int plt_offset, | |
253 | unsigned int plt_index) | |
254 | { | |
255 | return this->do_fill_plt_entry(pov, got_address, plt_address, | |
256 | got_offset, plt_offset, plt_index); | |
257 | } | |
258 | ||
259 | // Fill in the reserved TLSDESC PLT entry. | |
260 | void | |
261 | fill_tlsdesc_entry(unsigned char* pov, | |
262 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
263 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
264 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
265 | unsigned int tlsdesc_got_offset, | |
266 | unsigned int plt_offset) | |
267 | { | |
268 | this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base, | |
269 | tlsdesc_got_offset, plt_offset); | |
270 | } | |
271 | ||
272 | virtual unsigned int | |
273 | do_get_plt_entry_size() const = 0; | |
274 | ||
275 | virtual void | |
276 | do_fill_first_plt_entry(unsigned char* pov, | |
277 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
278 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr) | |
279 | = 0; | |
280 | ||
281 | virtual unsigned int | |
282 | do_fill_plt_entry(unsigned char* pov, | |
283 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
284 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
285 | unsigned int got_offset, | |
286 | unsigned int plt_offset, | |
287 | unsigned int plt_index) = 0; | |
288 | ||
289 | virtual void | |
290 | do_fill_tlsdesc_entry(unsigned char* pov, | |
291 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
292 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
293 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
294 | unsigned int tlsdesc_got_offset, | |
295 | unsigned int plt_offset) = 0; | |
296 | ||
7a0c0a14 CC |
297 | // Return the PLT address to use for a global symbol. |
298 | virtual uint64_t | |
299 | do_address_for_global(const Symbol* sym); | |
300 | ||
301 | // Return the PLT address to use for a local symbol. | |
302 | virtual uint64_t | |
303 | do_address_for_local(const Relobj* obj, unsigned int symndx); | |
304 | ||
2e702c99 RM |
305 | virtual void |
306 | do_add_eh_frame(Layout* layout) = 0; | |
307 | ||
7223e9ca ILT |
308 | void |
309 | do_adjust_output_section(Output_section* os); | |
310 | ||
311 | // Write to a map file. | |
312 | void | |
313 | do_print_to_mapfile(Mapfile* mapfile) const | |
314 | { mapfile->print_output_data(this, _("** PLT")); } | |
315 | ||
2e702c99 | 316 | // The CIE of the .eh_frame unwind information for the PLT. |
07a60597 | 317 | static const int plt_eh_frame_cie_size = 16; |
07a60597 | 318 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
7223e9ca | 319 | |
2e702c99 | 320 | private: |
7223e9ca ILT |
321 | // Set the final size. |
322 | void | |
323 | set_final_data_size(); | |
324 | ||
325 | // Write out the PLT data. | |
326 | void | |
327 | do_write(Output_file*); | |
328 | ||
329 | // The reloc section. | |
330 | Reloc_section* rel_; | |
331 | // The TLSDESC relocs, if necessary. These must follow the regular | |
332 | // PLT relocs. | |
333 | Reloc_section* tlsdesc_rel_; | |
67181c72 ILT |
334 | // The IRELATIVE relocs, if necessary. These must follow the |
335 | // regular PLT relocations and the TLSDESC relocations. | |
336 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
337 | // The .got section. |
338 | Output_data_got<64, false>* got_; | |
339 | // The .got.plt section. | |
57b2284c | 340 | Output_data_got_plt_x86_64* got_plt_; |
67181c72 ILT |
341 | // The part of the .got.plt section used for IRELATIVE relocs. |
342 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
343 | // The number of PLT entries. |
344 | unsigned int count_; | |
67181c72 ILT |
345 | // Number of PLT entries with R_X86_64_IRELATIVE relocs. These |
346 | // follow the regular PLT entries. | |
347 | unsigned int irelative_count_; | |
7223e9ca ILT |
348 | // Offset of the reserved TLSDESC_GOT entry when needed. |
349 | unsigned int tlsdesc_got_offset_; | |
4829d394 CC |
350 | // List of available regions within the section, for incremental |
351 | // update links. | |
352 | Free_list free_list_; | |
7223e9ca | 353 | }; |
2e30d253 | 354 | |
2e702c99 RM |
355 | template<int size> |
356 | class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size> | |
357 | { | |
358 | public: | |
359 | Output_data_plt_x86_64_standard(Layout* layout, | |
360 | Output_data_got<64, false>* got, | |
57b2284c | 361 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
362 | Output_data_space* got_irelative) |
363 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
364 | got, got_plt, got_irelative) | |
365 | { } | |
366 | ||
367 | Output_data_plt_x86_64_standard(Layout* layout, | |
368 | Output_data_got<64, false>* got, | |
57b2284c | 369 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
370 | Output_data_space* got_irelative, |
371 | unsigned int plt_count) | |
372 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
373 | got, got_plt, got_irelative, | |
374 | plt_count) | |
375 | { } | |
376 | ||
377 | protected: | |
378 | virtual unsigned int | |
379 | do_get_plt_entry_size() const | |
380 | { return plt_entry_size; } | |
381 | ||
382 | virtual void | |
383 | do_add_eh_frame(Layout* layout) | |
384 | { | |
385 | layout->add_eh_frame_for_plt(this, | |
386 | this->plt_eh_frame_cie, | |
387 | this->plt_eh_frame_cie_size, | |
388 | plt_eh_frame_fde, | |
389 | plt_eh_frame_fde_size); | |
390 | } | |
391 | ||
392 | virtual void | |
393 | do_fill_first_plt_entry(unsigned char* pov, | |
394 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
395 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
396 | ||
397 | virtual unsigned int | |
398 | do_fill_plt_entry(unsigned char* pov, | |
399 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
400 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
401 | unsigned int got_offset, | |
402 | unsigned int plt_offset, | |
403 | unsigned int plt_index); | |
404 | ||
405 | virtual void | |
406 | do_fill_tlsdesc_entry(unsigned char* pov, | |
407 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
408 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
409 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
410 | unsigned int tlsdesc_got_offset, | |
411 | unsigned int plt_offset); | |
412 | ||
413 | private: | |
414 | // The size of an entry in the PLT. | |
415 | static const int plt_entry_size = 16; | |
416 | ||
417 | // The first entry in the PLT. | |
418 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
419 | // procedure linkage table for both programs and shared objects." | |
420 | static const unsigned char first_plt_entry[plt_entry_size]; | |
421 | ||
422 | // Other entries in the PLT for an executable. | |
423 | static const unsigned char plt_entry[plt_entry_size]; | |
424 | ||
425 | // The reserved TLSDESC entry in the PLT for an executable. | |
426 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
427 | ||
428 | // The .eh_frame unwind information for the PLT. | |
429 | static const int plt_eh_frame_fde_size = 32; | |
430 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
431 | }; | |
432 | ||
750ea5ed CC |
433 | // We use this PLT when Indirect Branch Tracking (IBT) is enabled. |
434 | ||
435 | template <int size> | |
436 | class Output_data_plt_x86_64_ibt : public Output_data_plt_x86_64<size> | |
437 | { | |
438 | public: | |
439 | Output_data_plt_x86_64_ibt(Layout* layout, | |
440 | Output_data_got<64, false>* got, | |
441 | Output_data_got_plt_x86_64* got_plt, | |
442 | Output_data_space* got_irelative) | |
443 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
444 | got, got_plt, got_irelative), | |
445 | aplt_offset_(0) | |
446 | { } | |
447 | ||
448 | Output_data_plt_x86_64_ibt(Layout* layout, | |
449 | Output_data_got<64, false>* got, | |
450 | Output_data_got_plt_x86_64* got_plt, | |
451 | Output_data_space* got_irelative, | |
452 | unsigned int plt_count) | |
453 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
454 | got, got_plt, got_irelative, | |
455 | plt_count), | |
456 | aplt_offset_(0) | |
457 | { } | |
458 | ||
459 | protected: | |
460 | virtual unsigned int | |
461 | do_get_plt_entry_size() const | |
462 | { return plt_entry_size; } | |
463 | ||
464 | // Return the PLT address to use for a global symbol. | |
465 | uint64_t | |
466 | do_address_for_global(const Symbol*); | |
467 | ||
468 | // Return the PLT address to use for a local symbol. | |
469 | uint64_t | |
470 | do_address_for_local(const Relobj*, unsigned int symndx); | |
471 | ||
472 | virtual void | |
473 | do_add_eh_frame(Layout* layout) | |
474 | { | |
475 | layout->add_eh_frame_for_plt(this, | |
476 | this->plt_eh_frame_cie, | |
477 | this->plt_eh_frame_cie_size, | |
478 | plt_eh_frame_fde, | |
479 | plt_eh_frame_fde_size); | |
480 | } | |
481 | ||
482 | virtual void | |
483 | do_fill_first_plt_entry(unsigned char* pov, | |
484 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
485 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
486 | ||
487 | virtual unsigned int | |
488 | do_fill_plt_entry(unsigned char* pov, | |
489 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
490 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
491 | unsigned int got_offset, | |
492 | unsigned int plt_offset, | |
493 | unsigned int plt_index); | |
494 | ||
495 | virtual void | |
496 | do_fill_tlsdesc_entry(unsigned char* pov, | |
497 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
498 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
499 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
500 | unsigned int tlsdesc_got_offset, | |
501 | unsigned int plt_offset); | |
502 | ||
503 | void | |
504 | fill_aplt_entry(unsigned char* pov, | |
505 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
506 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
507 | unsigned int got_offset, | |
508 | unsigned int plt_offset, | |
509 | unsigned int plt_index); | |
510 | ||
511 | private: | |
512 | // Set the final size. | |
513 | void | |
514 | set_final_data_size(); | |
515 | ||
8ad93045 | 516 | // Write out the PLT data. |
750ea5ed CC |
517 | void |
518 | do_write(Output_file*); | |
519 | ||
520 | // Offset of the Additional PLT (if using -z bndplt). | |
521 | unsigned int aplt_offset_; | |
522 | ||
523 | // The size of an entry in the PLT. | |
524 | static const int plt_entry_size = 16; | |
525 | ||
526 | // The size of an entry in the additional PLT. | |
527 | static const int aplt_entry_size = 16; | |
528 | ||
529 | // The first entry in the PLT. | |
530 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
531 | // procedure linkage table for both programs and shared objects." | |
532 | static const unsigned char first_plt_entry[plt_entry_size]; | |
533 | ||
534 | // Other entries in the PLT for an executable. | |
535 | static const unsigned char plt_entry[plt_entry_size]; | |
536 | ||
537 | // Entries in the additional PLT. | |
538 | static const unsigned char aplt_entry[aplt_entry_size]; | |
539 | ||
540 | // The reserved TLSDESC entry in the PLT for an executable. | |
541 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
542 | ||
543 | // The .eh_frame unwind information for the PLT. | |
544 | static const int plt_eh_frame_fde_size = 32; | |
545 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
546 | }; | |
547 | ||
3a4f096e ST |
548 | template<int size> |
549 | class Lazy_view | |
550 | { | |
551 | public: | |
552 | Lazy_view(Sized_relobj_file<size, false>* object, unsigned int data_shndx) | |
553 | : object_(object), data_shndx_(data_shndx), view_(NULL), view_size_(0) | |
554 | { } | |
555 | ||
556 | inline unsigned char | |
557 | operator[](size_t offset) | |
558 | { | |
559 | if (this->view_ == NULL) | |
560 | this->view_ = this->object_->section_contents(this->data_shndx_, | |
561 | &this->view_size_, | |
562 | true); | |
563 | if (offset >= this->view_size_) | |
564 | return 0; | |
565 | return this->view_[offset]; | |
566 | } | |
567 | ||
568 | private: | |
569 | Sized_relobj_file<size, false>* object_; | |
570 | unsigned int data_shndx_; | |
571 | const unsigned char* view_; | |
572 | section_size_type view_size_; | |
573 | }; | |
574 | ||
2e30d253 | 575 | // The x86_64 target class. |
d61c17ea ILT |
576 | // See the ABI at |
577 | // http://www.x86-64.org/documentation/abi.pdf | |
578 | // TLS info comes from | |
579 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 580 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 581 | |
fc51264f L |
582 | template<int size> |
583 | class Target_x86_64 : public Sized_target<size, false> | |
2e30d253 ILT |
584 | { |
585 | public: | |
e822f2b1 ILT |
586 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
587 | // uses only Elf64_Rela relocation entries with explicit addends." | |
fc51264f | 588 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
2e30d253 | 589 | |
2e702c99 RM |
590 | Target_x86_64(const Target::Target_info* info = &x86_64_info) |
591 | : Sized_target<size, false>(info), | |
67181c72 ILT |
592 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
593 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
594 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), | |
43819297 | 595 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
a2575bec | 596 | tls_base_symbol_defined_(false), isa_1_used_(0), isa_1_needed_(0), |
586e3094 L |
597 | feature_1_(0), feature_2_used_(0), feature_2_needed_(0), |
598 | object_isa_1_used_(0), object_feature_1_(0), | |
599 | object_feature_2_used_(0), seen_first_object_(false) | |
2e30d253 ILT |
600 | { } |
601 | ||
8a5e3e08 ILT |
602 | // Hook for a new output section. |
603 | void | |
604 | do_new_output_section(Output_section*) const; | |
605 | ||
6d03d481 ST |
606 | // Scan the relocations to look for symbol adjustments. |
607 | void | |
ad0f2072 | 608 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
609 | Layout* layout, |
610 | Sized_relobj_file<size, false>* object, | |
611 | unsigned int data_shndx, | |
612 | unsigned int sh_type, | |
613 | const unsigned char* prelocs, | |
614 | size_t reloc_count, | |
615 | Output_section* output_section, | |
616 | bool needs_special_offset_handling, | |
617 | size_t local_symbol_count, | |
618 | const unsigned char* plocal_symbols); | |
6d03d481 | 619 | |
2e30d253 ILT |
620 | // Scan the relocations to look for symbol adjustments. |
621 | void | |
ad0f2072 | 622 | scan_relocs(Symbol_table* symtab, |
2e30d253 | 623 | Layout* layout, |
fc51264f | 624 | Sized_relobj_file<size, false>* object, |
2e30d253 ILT |
625 | unsigned int data_shndx, |
626 | unsigned int sh_type, | |
627 | const unsigned char* prelocs, | |
628 | size_t reloc_count, | |
730cdc88 ILT |
629 | Output_section* output_section, |
630 | bool needs_special_offset_handling, | |
2e30d253 | 631 | size_t local_symbol_count, |
730cdc88 | 632 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
633 | |
634 | // Finalize the sections. | |
635 | void | |
f59f41f3 | 636 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 637 | |
4fb6c25d ILT |
638 | // Return the value to use for a dynamic which requires special |
639 | // treatment. | |
640 | uint64_t | |
641 | do_dynsym_value(const Symbol*) const; | |
642 | ||
2e30d253 ILT |
643 | // Relocate a section. |
644 | void | |
fc51264f | 645 | relocate_section(const Relocate_info<size, false>*, |
2e30d253 ILT |
646 | unsigned int sh_type, |
647 | const unsigned char* prelocs, | |
648 | size_t reloc_count, | |
730cdc88 ILT |
649 | Output_section* output_section, |
650 | bool needs_special_offset_handling, | |
2e30d253 | 651 | unsigned char* view, |
fc51264f | 652 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
364c7fa5 ILT |
653 | section_size_type view_size, |
654 | const Reloc_symbol_changes*); | |
2e30d253 | 655 | |
6a74a719 ILT |
656 | // Scan the relocs during a relocatable link. |
657 | void | |
ad0f2072 | 658 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 659 | Layout* layout, |
fc51264f | 660 | Sized_relobj_file<size, false>* object, |
6a74a719 ILT |
661 | unsigned int data_shndx, |
662 | unsigned int sh_type, | |
663 | const unsigned char* prelocs, | |
664 | size_t reloc_count, | |
665 | Output_section* output_section, | |
666 | bool needs_special_offset_handling, | |
667 | size_t local_symbol_count, | |
668 | const unsigned char* plocal_symbols, | |
669 | Relocatable_relocs*); | |
670 | ||
4d625b70 CC |
671 | // Scan the relocs for --emit-relocs. |
672 | void | |
673 | emit_relocs_scan(Symbol_table* symtab, | |
674 | Layout* layout, | |
675 | Sized_relobj_file<size, false>* object, | |
676 | unsigned int data_shndx, | |
677 | unsigned int sh_type, | |
678 | const unsigned char* prelocs, | |
679 | size_t reloc_count, | |
680 | Output_section* output_section, | |
681 | bool needs_special_offset_handling, | |
682 | size_t local_symbol_count, | |
683 | const unsigned char* plocal_syms, | |
684 | Relocatable_relocs* rr); | |
685 | ||
7404fe1b | 686 | // Emit relocations for a section. |
6a74a719 | 687 | void |
7404fe1b | 688 | relocate_relocs( |
fc51264f L |
689 | const Relocate_info<size, false>*, |
690 | unsigned int sh_type, | |
691 | const unsigned char* prelocs, | |
692 | size_t reloc_count, | |
693 | Output_section* output_section, | |
62fe925a | 694 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
fc51264f L |
695 | unsigned char* view, |
696 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
697 | section_size_type view_size, | |
698 | unsigned char* reloc_view, | |
699 | section_size_type reloc_view_size); | |
6a74a719 | 700 | |
2e30d253 ILT |
701 | // Return a string used to fill a code section with nops. |
702 | std::string | |
8851ecca | 703 | do_code_fill(section_size_type length) const; |
2e30d253 | 704 | |
9a2d6984 ILT |
705 | // Return whether SYM is defined by the ABI. |
706 | bool | |
9c2d0ef9 | 707 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
708 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
709 | ||
e291e7b9 ILT |
710 | // Return the symbol index to use for a target specific relocation. |
711 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
712 | // local symbol, which is an absolute reloc. | |
713 | unsigned int | |
714 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
715 | { | |
716 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
717 | return 0; | |
718 | } | |
719 | ||
720 | // Return the addend to use for a target specific relocation. | |
721 | uint64_t | |
722 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
723 | ||
7223e9ca | 724 | // Return the PLT section. |
67181c72 ILT |
725 | uint64_t |
726 | do_plt_address_for_global(const Symbol* gsym) const | |
727 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 728 | |
67181c72 ILT |
729 | uint64_t |
730 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
731 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 732 | |
b3ce541e ILT |
733 | // This function should be defined in targets that can use relocation |
734 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
735 | // and global_reloc_may_be_function_pointer) | |
736 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
737 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
4aebb631 RC |
738 | // pie binaries, safe ICF cannot be done by looking at only relocation |
739 | // types, and for certain cases (e.g. R_X86_64_PC32), the instruction | |
740 | // opcode is checked as well to distinguish a function call from taking | |
741 | // a function's pointer. | |
b3ce541e ILT |
742 | bool |
743 | do_can_check_for_function_pointers() const | |
4aebb631 | 744 | { return true; } |
b3ce541e | 745 | |
02d7cd44 ILT |
746 | // Return the base for a DW_EH_PE_datarel encoding. |
747 | uint64_t | |
748 | do_ehframe_datarel_base() const; | |
749 | ||
9b547ce6 | 750 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
751 | void |
752 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
753 | section_offset_type fnoffset, section_size_type fnsize, | |
6e0813d3 | 754 | const unsigned char* prelocs, size_t reloc_count, |
364c7fa5 ILT |
755 | unsigned char* view, section_size_type view_size, |
756 | std::string* from, std::string* to) const; | |
757 | ||
96f2030e | 758 | // Return the size of the GOT section. |
fe8718a4 | 759 | section_size_type |
0e70b911 | 760 | got_size() const |
96f2030e ILT |
761 | { |
762 | gold_assert(this->got_ != NULL); | |
763 | return this->got_->data_size(); | |
764 | } | |
765 | ||
0e70b911 CC |
766 | // Return the number of entries in the GOT. |
767 | unsigned int | |
768 | got_entry_count() const | |
769 | { | |
770 | if (this->got_ == NULL) | |
771 | return 0; | |
772 | return this->got_size() / 8; | |
773 | } | |
774 | ||
775 | // Return the number of entries in the PLT. | |
776 | unsigned int | |
777 | plt_entry_count() const; | |
778 | ||
779 | // Return the offset of the first non-reserved PLT entry. | |
780 | unsigned int | |
781 | first_plt_entry_offset() const; | |
782 | ||
783 | // Return the size of each PLT entry. | |
784 | unsigned int | |
785 | plt_entry_size() const; | |
786 | ||
41e83f2b L |
787 | // Return the size of each GOT entry. |
788 | unsigned int | |
789 | got_entry_size() const | |
790 | { return 8; }; | |
791 | ||
4829d394 | 792 | // Create the GOT section for an incremental update. |
dd74ae06 | 793 | Output_data_got_base* |
4829d394 CC |
794 | init_got_plt_for_update(Symbol_table* symtab, |
795 | Layout* layout, | |
796 | unsigned int got_count, | |
797 | unsigned int plt_count); | |
798 | ||
6fa2a40b CC |
799 | // Reserve a GOT entry for a local symbol, and regenerate any |
800 | // necessary dynamic relocations. | |
801 | void | |
802 | reserve_local_got_entry(unsigned int got_index, | |
2e702c99 | 803 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
804 | unsigned int r_sym, |
805 | unsigned int got_type); | |
806 | ||
807 | // Reserve a GOT entry for a global symbol, and regenerate any | |
808 | // necessary dynamic relocations. | |
809 | void | |
810 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
811 | unsigned int got_type); | |
812 | ||
4829d394 | 813 | // Register an existing PLT entry for a global symbol. |
4829d394 | 814 | void |
67181c72 ILT |
815 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
816 | Symbol* gsym); | |
4829d394 | 817 | |
26d3c67d CC |
818 | // Force a COPY relocation for a given symbol. |
819 | void | |
820 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
821 | ||
94a3fc8b CC |
822 | // Apply an incremental relocation. |
823 | void | |
fc51264f L |
824 | apply_relocation(const Relocate_info<size, false>* relinfo, |
825 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 826 | unsigned int r_type, |
fc51264f | 827 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
828 | const Symbol* gsym, |
829 | unsigned char* view, | |
fc51264f | 830 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
831 | section_size_type view_size); |
832 | ||
e291e7b9 ILT |
833 | // Add a new reloc argument, returning the index in the vector. |
834 | size_t | |
fc51264f | 835 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
836 | { |
837 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
838 | return this->tlsdesc_reloc_info_.size() - 1; | |
839 | } | |
840 | ||
2e702c99 RM |
841 | Output_data_plt_x86_64<size>* |
842 | make_data_plt(Layout* layout, | |
843 | Output_data_got<64, false>* got, | |
57b2284c | 844 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
845 | Output_data_space* got_irelative) |
846 | { | |
847 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); | |
848 | } | |
849 | ||
850 | Output_data_plt_x86_64<size>* | |
851 | make_data_plt(Layout* layout, | |
852 | Output_data_got<64, false>* got, | |
57b2284c | 853 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
854 | Output_data_space* got_irelative, |
855 | unsigned int plt_count) | |
856 | { | |
857 | return this->do_make_data_plt(layout, got, got_plt, got_irelative, | |
858 | plt_count); | |
859 | } | |
860 | ||
861 | virtual Output_data_plt_x86_64<size>* | |
862 | do_make_data_plt(Layout* layout, | |
863 | Output_data_got<64, false>* got, | |
57b2284c | 864 | Output_data_got_plt_x86_64* got_plt, |
7a0c0a14 | 865 | Output_data_space* got_irelative); |
2e702c99 RM |
866 | |
867 | virtual Output_data_plt_x86_64<size>* | |
868 | do_make_data_plt(Layout* layout, | |
869 | Output_data_got<64, false>* got, | |
57b2284c | 870 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 | 871 | Output_data_space* got_irelative, |
7a0c0a14 | 872 | unsigned int plt_count); |
2e702c99 | 873 | |
2e30d253 ILT |
874 | private: |
875 | // The class which scans relocations. | |
a036edd8 | 876 | class Scan |
2e30d253 | 877 | { |
a036edd8 ILT |
878 | public: |
879 | Scan() | |
880 | : issued_non_pic_error_(false) | |
881 | { } | |
882 | ||
95a2c8d6 RS |
883 | static inline int |
884 | get_reference_flags(unsigned int r_type); | |
885 | ||
2e30d253 | 886 | inline void |
ad0f2072 | 887 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 888 | Sized_relobj_file<size, false>* object, |
2e30d253 | 889 | unsigned int data_shndx, |
07f397ab | 890 | Output_section* output_section, |
fc51264f | 891 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
892 | const elfcpp::Sym<size, false>& lsym, |
893 | bool is_discarded); | |
2e30d253 ILT |
894 | |
895 | inline void | |
ad0f2072 | 896 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 897 | Sized_relobj_file<size, false>* object, |
2e30d253 | 898 | unsigned int data_shndx, |
07f397ab | 899 | Output_section* output_section, |
fc51264f | 900 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
2e30d253 | 901 | Symbol* gsym); |
e041f13d | 902 | |
21bb3914 ST |
903 | inline bool |
904 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
905 | Target_x86_64* target, | |
2e702c99 RM |
906 | Sized_relobj_file<size, false>* object, |
907 | unsigned int data_shndx, | |
908 | Output_section* output_section, | |
909 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 910 | unsigned int r_type, |
2e702c99 | 911 | const elfcpp::Sym<size, false>& lsym); |
21bb3914 ST |
912 | |
913 | inline bool | |
914 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
2e702c99 RM |
915 | Target_x86_64* target, |
916 | Sized_relobj_file<size, false>* object, | |
917 | unsigned int data_shndx, | |
918 | Output_section* output_section, | |
919 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 920 | unsigned int r_type, |
2e702c99 | 921 | Symbol* gsym); |
21bb3914 | 922 | |
a036edd8 | 923 | private: |
e041f13d | 924 | static void |
fc51264f L |
925 | unsupported_reloc_local(Sized_relobj_file<size, false>*, |
926 | unsigned int r_type); | |
e041f13d ILT |
927 | |
928 | static void | |
fc51264f L |
929 | unsupported_reloc_global(Sized_relobj_file<size, false>*, |
930 | unsigned int r_type, Symbol*); | |
a036edd8 ILT |
931 | |
932 | void | |
a29b0dad | 933 | check_non_pic(Relobj*, unsigned int r_type, Symbol*); |
a036edd8 | 934 | |
21bb3914 | 935 | inline bool |
4aebb631 RC |
936 | possible_function_pointer_reloc(Sized_relobj_file<size, false>* src_obj, |
937 | unsigned int src_indx, | |
938 | unsigned int r_offset, | |
939 | unsigned int r_type); | |
21bb3914 | 940 | |
7223e9ca | 941 | bool |
fc51264f | 942 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*, |
6fa2a40b | 943 | unsigned int r_type); |
7223e9ca | 944 | |
a036edd8 ILT |
945 | // Whether we have issued an error about a non-PIC compilation. |
946 | bool issued_non_pic_error_; | |
2e30d253 ILT |
947 | }; |
948 | ||
949 | // The class which implements relocation. | |
950 | class Relocate | |
951 | { | |
952 | public: | |
953 | Relocate() | |
36171d64 | 954 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
955 | { } |
956 | ||
957 | ~Relocate() | |
958 | { | |
959 | if (this->skip_call_tls_get_addr_) | |
960 | { | |
961 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 962 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
963 | } |
964 | } | |
965 | ||
966 | // Do a relocation. Return false if the caller should not issue | |
967 | // any warnings about this relocation. | |
968 | inline bool | |
91a65d2f AM |
969 | relocate(const Relocate_info<size, false>*, unsigned int, |
970 | Target_x86_64*, Output_section*, size_t, const unsigned char*, | |
971 | const Sized_symbol<size>*, const Symbol_value<size>*, | |
fc51264f | 972 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 973 | section_size_type); |
2e30d253 ILT |
974 | |
975 | private: | |
976 | // Do a TLS relocation. | |
977 | inline void | |
fc51264f | 978 | relocate_tls(const Relocate_info<size, false>*, Target_x86_64*, |
2e702c99 | 979 | size_t relnum, const elfcpp::Rela<size, false>&, |
fc51264f L |
980 | unsigned int r_type, const Sized_symbol<size>*, |
981 | const Symbol_value<size>*, | |
982 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 983 | section_size_type); |
2e30d253 | 984 | |
c2b45e22 | 985 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 | 986 | inline void |
fc51264f | 987 | tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
fc51264f L |
988 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
989 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
7bf1f802 | 990 | unsigned char* view, |
fc51264f | 991 | typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 992 | section_size_type view_size); |
7bf1f802 | 993 | |
56622147 ILT |
994 | // Do a TLS General-Dynamic to Local-Exec transition. |
995 | inline void | |
fc51264f | 996 | tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 997 | Output_segment* tls_segment, |
fc51264f L |
998 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
999 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 1000 | unsigned char* view, |
fe8718a4 | 1001 | section_size_type view_size); |
2e30d253 | 1002 | |
c2b45e22 CC |
1003 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
1004 | inline void | |
fc51264f | 1005 | tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
fc51264f L |
1006 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1007 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 | 1008 | unsigned char* view, |
fc51264f | 1009 | typename elfcpp::Elf_types<size>::Elf_Addr, |
c2b45e22 CC |
1010 | section_size_type view_size); |
1011 | ||
1012 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
1013 | inline void | |
fc51264f | 1014 | tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 1015 | Output_segment* tls_segment, |
fc51264f L |
1016 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1017 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 CC |
1018 | unsigned char* view, |
1019 | section_size_type view_size); | |
1020 | ||
56622147 | 1021 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 1022 | inline void |
fc51264f | 1023 | tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 1024 | Output_segment* tls_segment, |
fc51264f L |
1025 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1026 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 1027 | unsigned char* view, |
fe8718a4 | 1028 | section_size_type view_size); |
2e30d253 | 1029 | |
56622147 ILT |
1030 | // Do a TLS Initial-Exec to Local-Exec transition. |
1031 | static inline void | |
fc51264f | 1032 | tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum, |
72ec2876 | 1033 | Output_segment* tls_segment, |
fc51264f L |
1034 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1035 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
72ec2876 | 1036 | unsigned char* view, |
fe8718a4 | 1037 | section_size_type view_size); |
2e30d253 ILT |
1038 | |
1039 | // This is set if we should skip the next reloc, which should be a | |
1040 | // PLT32 reloc against ___tls_get_addr. | |
1041 | bool skip_call_tls_get_addr_; | |
1042 | }; | |
1043 | ||
1fa29f10 IT |
1044 | // Check if relocation against this symbol is a candidate for |
1045 | // conversion from | |
1046 | // mov foo@GOTPCREL(%rip), %reg | |
1047 | // to lea foo(%rip), %reg. | |
3a4f096e ST |
1048 | template<class View_type> |
1049 | static inline bool | |
1050 | can_convert_mov_to_lea(const Symbol* gsym, unsigned int r_type, | |
1051 | size_t r_offset, View_type* view) | |
1fa29f10 IT |
1052 | { |
1053 | gold_assert(gsym != NULL); | |
3a4f096e ST |
1054 | // We cannot do the conversion unless it's one of these relocations. |
1055 | if (r_type != elfcpp::R_X86_64_GOTPCREL | |
1056 | && r_type != elfcpp::R_X86_64_GOTPCRELX | |
1057 | && r_type != elfcpp::R_X86_64_REX_GOTPCRELX) | |
1058 | return false; | |
1059 | // We cannot convert references to IFUNC symbols, or to symbols that | |
1060 | // are not local to the current module. | |
ed35cc4a CC |
1061 | // We can't do predefined symbols because they may become undefined |
1062 | // (e.g., __ehdr_start when the headers aren't mapped to a segment). | |
3a4f096e | 1063 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
ed35cc4a CC |
1064 | || gsym->is_undefined() |
1065 | || gsym->is_predefined() | |
3a4f096e ST |
1066 | || gsym->is_from_dynobj() |
1067 | || gsym->is_preemptible()) | |
1068 | return false; | |
1069 | // If we are building a shared object and the symbol is protected, we may | |
1070 | // need to go through the GOT. | |
1071 | if (parameters->options().shared() | |
1072 | && gsym->visibility() == elfcpp::STV_PROTECTED) | |
1073 | return false; | |
1074 | // We cannot convert references to the _DYNAMIC symbol. | |
1075 | if (strcmp(gsym->name(), "_DYNAMIC") == 0) | |
1076 | return false; | |
1077 | // Check for a MOV opcode. | |
1078 | return (*view)[r_offset - 2] == 0x8b; | |
1079 | } | |
1080 | ||
1081 | // Convert | |
1082 | // callq *foo@GOTPCRELX(%rip) to | |
1083 | // addr32 callq foo | |
1084 | // and jmpq *foo@GOTPCRELX(%rip) to | |
1085 | // jmpq foo | |
1086 | // nop | |
1087 | template<class View_type> | |
1088 | static inline bool | |
1089 | can_convert_callq_to_direct(const Symbol* gsym, unsigned int r_type, | |
1090 | size_t r_offset, View_type* view) | |
1091 | { | |
1092 | gold_assert(gsym != NULL); | |
1093 | // We cannot do the conversion unless it's a GOTPCRELX relocation. | |
1094 | if (r_type != elfcpp::R_X86_64_GOTPCRELX) | |
1095 | return false; | |
1096 | // We cannot convert references to IFUNC symbols, or to symbols that | |
1097 | // are not local to the current module. | |
1098 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1099 | || gsym->is_undefined () | |
1100 | || gsym->is_from_dynobj() | |
1101 | || gsym->is_preemptible()) | |
1102 | return false; | |
1103 | // Check for a CALLQ or JMPQ opcode. | |
1104 | return ((*view)[r_offset - 2] == 0xff | |
1105 | && ((*view)[r_offset - 1] == 0x15 | |
1106 | || (*view)[r_offset - 1] == 0x25)); | |
1fa29f10 IT |
1107 | } |
1108 | ||
2e30d253 ILT |
1109 | // Adjust TLS relocation type based on the options and whether this |
1110 | // is a local symbol. | |
e041f13d | 1111 | static tls::Tls_optimization |
2e30d253 ILT |
1112 | optimize_tls_reloc(bool is_final, int r_type); |
1113 | ||
1114 | // Get the GOT section, creating it if necessary. | |
1115 | Output_data_got<64, false>* | |
1116 | got_section(Symbol_table*, Layout*); | |
1117 | ||
96f2030e | 1118 | // Get the GOT PLT section. |
57b2284c | 1119 | Output_data_got_plt_x86_64* |
96f2030e ILT |
1120 | got_plt_section() const |
1121 | { | |
1122 | gold_assert(this->got_plt_ != NULL); | |
1123 | return this->got_plt_; | |
1124 | } | |
1125 | ||
a8df5856 ILT |
1126 | // Get the GOT section for TLSDESC entries. |
1127 | Output_data_got<64, false>* | |
1128 | got_tlsdesc_section() const | |
1129 | { | |
1130 | gold_assert(this->got_tlsdesc_ != NULL); | |
1131 | return this->got_tlsdesc_; | |
1132 | } | |
1133 | ||
c2b45e22 CC |
1134 | // Create the PLT section. |
1135 | void | |
1136 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
1137 | ||
2e30d253 ILT |
1138 | // Create a PLT entry for a global symbol. |
1139 | void | |
1140 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1141 | ||
7223e9ca ILT |
1142 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
1143 | void | |
1144 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
fc51264f | 1145 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
1146 | unsigned int local_sym_index); |
1147 | ||
9fa33bee | 1148 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1149 | void |
1150 | define_tls_base_symbol(Symbol_table*, Layout*); | |
1151 | ||
c2b45e22 CC |
1152 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1153 | void | |
1154 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
1155 | ||
31d60480 ILT |
1156 | // Create a GOT entry for the TLS module index. |
1157 | unsigned int | |
1158 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
fc51264f | 1159 | Sized_relobj_file<size, false>* object); |
31d60480 | 1160 | |
2e30d253 | 1161 | // Get the PLT section. |
fc51264f | 1162 | Output_data_plt_x86_64<size>* |
2e30d253 ILT |
1163 | plt_section() const |
1164 | { | |
1165 | gold_assert(this->plt_ != NULL); | |
1166 | return this->plt_; | |
1167 | } | |
1168 | ||
1169 | // Get the dynamic reloc section, creating it if necessary. | |
1170 | Reloc_section* | |
0ffd9845 | 1171 | rela_dyn_section(Layout*); |
2e30d253 | 1172 | |
e291e7b9 ILT |
1173 | // Get the section to use for TLSDESC relocations. |
1174 | Reloc_section* | |
1175 | rela_tlsdesc_section(Layout*) const; | |
1176 | ||
67181c72 ILT |
1177 | // Get the section to use for IRELATIVE relocations. |
1178 | Reloc_section* | |
1179 | rela_irelative_section(Layout*); | |
1180 | ||
12c0daef | 1181 | // Add a potential copy relocation. |
2e30d253 | 1182 | void |
ef9beddf | 1183 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 1184 | Sized_relobj_file<size, false>* object, |
12c0daef | 1185 | unsigned int shndx, Output_section* output_section, |
fc51264f | 1186 | Symbol* sym, const elfcpp::Rela<size, false>& reloc) |
12c0daef | 1187 | { |
859d7987 | 1188 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
12c0daef | 1189 | this->copy_relocs_.copy_reloc(symtab, layout, |
fc51264f | 1190 | symtab->get_sized_symbol<size>(sym), |
12c0daef | 1191 | object, shndx, output_section, |
859d7987 CC |
1192 | r_type, reloc.get_r_offset(), |
1193 | reloc.get_r_addend(), | |
1194 | this->rela_dyn_section(layout)); | |
12c0daef | 1195 | } |
2e30d253 | 1196 | |
a2575bec | 1197 | // Record a target-specific program property in the .note.gnu.property |
6c04fd9b CC |
1198 | // section. |
1199 | void | |
dc1f2887 CC |
1200 | record_gnu_property(unsigned int, unsigned int, size_t, |
1201 | const unsigned char*, const Object*); | |
a2575bec CC |
1202 | |
1203 | // Merge the target-specific program properties from the current object. | |
1204 | void | |
1205 | merge_gnu_properties(const Object*); | |
1206 | ||
1207 | // Finalize the target-specific program properties and add them back to | |
1208 | // the layout. | |
1209 | void | |
1210 | do_finalize_gnu_properties(Layout*) const; | |
6c04fd9b | 1211 | |
2e30d253 ILT |
1212 | // Information about this specific target which we pass to the |
1213 | // general Target structure. | |
1214 | static const Target::Target_info x86_64_info; | |
1215 | ||
0e70b911 CC |
1216 | // The types of GOT entries needed for this platform. |
1217 | // These values are exposed to the ABI in an incremental link. | |
1218 | // Do not renumber existing values without changing the version | |
1219 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
1220 | enum Got_type |
1221 | { | |
1222 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
1223 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
1224 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
1225 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
1226 | }; | |
1227 | ||
e291e7b9 ILT |
1228 | // This type is used as the argument to the target specific |
1229 | // relocation routines. The only target specific reloc is | |
1230 | // R_X86_64_TLSDESC against a local symbol. | |
1231 | struct Tlsdesc_info | |
1232 | { | |
fc51264f | 1233 | Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym) |
e291e7b9 ILT |
1234 | : object(a_object), r_sym(a_r_sym) |
1235 | { } | |
1236 | ||
1237 | // The object in which the local symbol is defined. | |
fc51264f | 1238 | Sized_relobj_file<size, false>* object; |
e291e7b9 ILT |
1239 | // The local symbol index in the object. |
1240 | unsigned int r_sym; | |
1241 | }; | |
1242 | ||
2e30d253 ILT |
1243 | // The GOT section. |
1244 | Output_data_got<64, false>* got_; | |
1245 | // The PLT section. | |
fc51264f | 1246 | Output_data_plt_x86_64<size>* plt_; |
2e30d253 | 1247 | // The GOT PLT section. |
57b2284c | 1248 | Output_data_got_plt_x86_64* got_plt_; |
67181c72 ILT |
1249 | // The GOT section for IRELATIVE relocations. |
1250 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
1251 | // The GOT section for TLSDESC relocations. |
1252 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
1253 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
1254 | Symbol* global_offset_table_; | |
2e30d253 | 1255 | // The dynamic reloc section. |
0ffd9845 | 1256 | Reloc_section* rela_dyn_; |
67181c72 ILT |
1257 | // The section to use for IRELATIVE relocs. |
1258 | Reloc_section* rela_irelative_; | |
2e30d253 | 1259 | // Relocs saved to avoid a COPY reloc. |
fc51264f | 1260 | Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_; |
c2b45e22 | 1261 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 1262 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
1263 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
1264 | // specific relocation. Here we store the object and local symbol | |
1265 | // index for the relocation. | |
1266 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
1267 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
1268 | bool tls_base_symbol_defined_; | |
a2575bec CC |
1269 | // Target-specific program properties, from .note.gnu.property section. |
1270 | // Each bit represents a specific feature. | |
1271 | uint32_t isa_1_used_; | |
1272 | uint32_t isa_1_needed_; | |
1273 | uint32_t feature_1_; | |
586e3094 L |
1274 | uint32_t feature_2_used_; |
1275 | uint32_t feature_2_needed_; | |
a2575bec | 1276 | // Target-specific properties from the current object. |
a9fc784b CC |
1277 | // These bits get ORed into ISA_1_USED_ after all properties for the object |
1278 | // have been processed. But if either is all zeroes (as when the property | |
1279 | // is absent from an object), the result should be all zeroes. | |
1280 | // (See PR ld/23486.) | |
1281 | uint32_t object_isa_1_used_; | |
a2575bec CC |
1282 | // These bits get ANDed into FEATURE_1_ after all properties for the object |
1283 | // have been processed. | |
1284 | uint32_t object_feature_1_; | |
586e3094 | 1285 | uint32_t object_feature_2_used_; |
a2575bec CC |
1286 | // Whether we have seen our first object, for use in initializing FEATURE_1_. |
1287 | bool seen_first_object_; | |
2e30d253 ILT |
1288 | }; |
1289 | ||
fc51264f L |
1290 | template<> |
1291 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
1292 | { |
1293 | 64, // size | |
1294 | false, // is_big_endian | |
1295 | elfcpp::EM_X86_64, // machine_code | |
1296 | false, // has_make_symbol | |
1297 | false, // has_resolve | |
1298 | true, // has_code_fill | |
35cdfc9a | 1299 | true, // is_default_stack_executable |
b3ce541e | 1300 | true, // can_icf_inline_merge_sections |
0864d551 | 1301 | '\0', // wrap_char |
2e30d253 | 1302 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 1303 | 0x400000, // default_text_segment_address |
cd72c291 | 1304 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 1305 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
1306 | false, // isolate_execinstr |
1307 | 0, // rosegment_gap | |
8a5e3e08 ILT |
1308 | elfcpp::SHN_UNDEF, // small_common_shndx |
1309 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1310 | 0, // small_common_section_flags | |
05a352e6 DK |
1311 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
1312 | NULL, // attributes_section | |
a67858e0 | 1313 | NULL, // attributes_vendor |
8d9743bd MK |
1314 | "_start", // entry_symbol_name |
1315 | 32, // hash_entry_size | |
bce5a025 | 1316 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
2e30d253 ILT |
1317 | }; |
1318 | ||
fc51264f L |
1319 | template<> |
1320 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
1321 | { | |
1322 | 32, // size | |
1323 | false, // is_big_endian | |
1324 | elfcpp::EM_X86_64, // machine_code | |
1325 | false, // has_make_symbol | |
1326 | false, // has_resolve | |
1327 | true, // has_code_fill | |
1328 | true, // is_default_stack_executable | |
1329 | true, // can_icf_inline_merge_sections | |
1330 | '\0', // wrap_char | |
1331 | "/libx32/ldx32.so.1", // program interpreter | |
1332 | 0x400000, // default_text_segment_address | |
1333 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
1334 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2e702c99 RM |
1335 | false, // isolate_execinstr |
1336 | 0, // rosegment_gap | |
fc51264f L |
1337 | elfcpp::SHN_UNDEF, // small_common_shndx |
1338 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1339 | 0, // small_common_section_flags | |
1340 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
1341 | NULL, // attributes_section | |
a67858e0 | 1342 | NULL, // attributes_vendor |
8d9743bd MK |
1343 | "_start", // entry_symbol_name |
1344 | 32, // hash_entry_size | |
bce5a025 | 1345 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
fc51264f L |
1346 | }; |
1347 | ||
8a5e3e08 ILT |
1348 | // This is called when a new output section is created. This is where |
1349 | // we handle the SHF_X86_64_LARGE. | |
1350 | ||
fc51264f | 1351 | template<int size> |
8a5e3e08 | 1352 | void |
fc51264f | 1353 | Target_x86_64<size>::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
1354 | { |
1355 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
1356 | os->set_is_large_section(); | |
1357 | } | |
1358 | ||
2e30d253 ILT |
1359 | // Get the GOT section, creating it if necessary. |
1360 | ||
fc51264f | 1361 | template<int size> |
2e30d253 | 1362 | Output_data_got<64, false>* |
fc51264f | 1363 | Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout) |
2e30d253 ILT |
1364 | { |
1365 | if (this->got_ == NULL) | |
1366 | { | |
1367 | gold_assert(symtab != NULL && layout != NULL); | |
1368 | ||
9446efde ILT |
1369 | // When using -z now, we can treat .got.plt as a relro section. |
1370 | // Without -z now, it is modified after program startup by lazy | |
1371 | // PLT relocations. | |
1372 | bool is_got_plt_relro = parameters->options().now(); | |
1373 | Output_section_order got_order = (is_got_plt_relro | |
1374 | ? ORDER_RELRO | |
1375 | : ORDER_RELRO_LAST); | |
1376 | Output_section_order got_plt_order = (is_got_plt_relro | |
1377 | ? ORDER_RELRO | |
1378 | : ORDER_NON_RELRO_FIRST); | |
1379 | ||
2e30d253 ILT |
1380 | this->got_ = new Output_data_got<64, false>(); |
1381 | ||
82742395 ILT |
1382 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
1383 | (elfcpp::SHF_ALLOC | |
1384 | | elfcpp::SHF_WRITE), | |
9446efde | 1385 | this->got_, got_order, true); |
2e30d253 | 1386 | |
57b2284c | 1387 | this->got_plt_ = new Output_data_got_plt_x86_64(layout); |
82742395 ILT |
1388 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1389 | (elfcpp::SHF_ALLOC | |
1390 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
1391 | this->got_plt_, got_plt_order, |
1392 | is_got_plt_relro); | |
2e30d253 ILT |
1393 | |
1394 | // The first three entries are reserved. | |
27bc2bce | 1395 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 1396 | |
9446efde ILT |
1397 | if (!is_got_plt_relro) |
1398 | { | |
1399 | // Those bytes can go into the relro segment. | |
1400 | layout->increase_relro(3 * 8); | |
1401 | } | |
1a2dff53 | 1402 | |
2e30d253 | 1403 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
1404 | this->global_offset_table_ = |
1405 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1406 | Symbol_table::PREDEFINED, | |
1407 | this->got_plt_, | |
1408 | 0, 0, elfcpp::STT_OBJECT, | |
1409 | elfcpp::STB_LOCAL, | |
1410 | elfcpp::STV_HIDDEN, 0, | |
1411 | false, false); | |
a8df5856 | 1412 | |
67181c72 ILT |
1413 | // If there are any IRELATIVE relocations, they get GOT entries |
1414 | // in .got.plt after the jump slot entries. | |
1415 | this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT"); | |
1416 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1417 | (elfcpp::SHF_ALLOC | |
1418 | | elfcpp::SHF_WRITE), | |
1419 | this->got_irelative_, | |
9446efde | 1420 | got_plt_order, is_got_plt_relro); |
67181c72 | 1421 | |
a8df5856 | 1422 | // If there are any TLSDESC relocations, they get GOT entries in |
67181c72 | 1423 | // .got.plt after the jump slot and IRELATIVE entries. |
a8df5856 ILT |
1424 | this->got_tlsdesc_ = new Output_data_got<64, false>(); |
1425 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1426 | (elfcpp::SHF_ALLOC | |
1427 | | elfcpp::SHF_WRITE), | |
22f0da72 | 1428 | this->got_tlsdesc_, |
9446efde | 1429 | got_plt_order, is_got_plt_relro); |
2e30d253 ILT |
1430 | } |
1431 | ||
1432 | return this->got_; | |
1433 | } | |
1434 | ||
1435 | // Get the dynamic reloc section, creating it if necessary. | |
1436 | ||
fc51264f L |
1437 | template<int size> |
1438 | typename Target_x86_64<size>::Reloc_section* | |
1439 | Target_x86_64<size>::rela_dyn_section(Layout* layout) | |
2e30d253 | 1440 | { |
0ffd9845 | 1441 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
1442 | { |
1443 | gold_assert(layout != NULL); | |
d98bc257 | 1444 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 1445 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
1446 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
1447 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 1448 | } |
0ffd9845 | 1449 | return this->rela_dyn_; |
2e30d253 ILT |
1450 | } |
1451 | ||
67181c72 ILT |
1452 | // Get the section to use for IRELATIVE relocs, creating it if |
1453 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
1454 | // relocations. They need to follow the other dynamic relocations so | |
1455 | // that they can refer to global variables initialized by those | |
1456 | // relocs. | |
1457 | ||
fc51264f L |
1458 | template<int size> |
1459 | typename Target_x86_64<size>::Reloc_section* | |
1460 | Target_x86_64<size>::rela_irelative_section(Layout* layout) | |
67181c72 ILT |
1461 | { |
1462 | if (this->rela_irelative_ == NULL) | |
1463 | { | |
1464 | // Make sure we have already created the dynamic reloc section. | |
1465 | this->rela_dyn_section(layout); | |
1466 | this->rela_irelative_ = new Reloc_section(false); | |
1467 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
1468 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
1469 | ORDER_DYNAMIC_RELOCS, false); | |
1470 | gold_assert(this->rela_dyn_->output_section() | |
1471 | == this->rela_irelative_->output_section()); | |
1472 | } | |
1473 | return this->rela_irelative_; | |
1474 | } | |
1475 | ||
a2575bec | 1476 | // Record a target-specific program property from the .note.gnu.property |
6c04fd9b CC |
1477 | // section. |
1478 | template<int size> | |
1479 | void | |
a2575bec | 1480 | Target_x86_64<size>::record_gnu_property( |
dc1f2887 | 1481 | unsigned int, unsigned int pr_type, |
a2575bec CC |
1482 | size_t pr_datasz, const unsigned char* pr_data, |
1483 | const Object* object) | |
6c04fd9b | 1484 | { |
add41311 | 1485 | uint32_t val = 0; |
a2575bec | 1486 | |
6c04fd9b CC |
1487 | switch (pr_type) |
1488 | { | |
586e3094 L |
1489 | case elfcpp::GNU_PROPERTY_X86_COMPAT_ISA_1_USED: |
1490 | case elfcpp::GNU_PROPERTY_X86_COMPAT_ISA_1_NEEDED: | |
1491 | case elfcpp::GNU_PROPERTY_X86_COMPAT_2_ISA_1_USED: | |
1492 | case elfcpp::GNU_PROPERTY_X86_COMPAT_2_ISA_1_NEEDED: | |
6c04fd9b CC |
1493 | case elfcpp::GNU_PROPERTY_X86_ISA_1_USED: |
1494 | case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED: | |
6c04fd9b | 1495 | case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND: |
586e3094 L |
1496 | case elfcpp::GNU_PROPERTY_X86_FEATURE_2_USED: |
1497 | case elfcpp::GNU_PROPERTY_X86_FEATURE_2_NEEDED: | |
a2575bec CC |
1498 | if (pr_datasz != 4) |
1499 | { | |
1500 | gold_warning(_("%s: corrupt .note.gnu.property section " | |
1501 | "(pr_datasz for property %d is not 4)"), | |
1502 | object->name().c_str(), pr_type); | |
1503 | return; | |
1504 | } | |
1505 | val = elfcpp::Swap<32, false>::readval(pr_data); | |
6c04fd9b CC |
1506 | break; |
1507 | default: | |
a2575bec CC |
1508 | gold_warning(_("%s: unknown program property type 0x%x " |
1509 | "in .note.gnu.property section"), | |
1510 | object->name().c_str(), pr_type); | |
6c04fd9b CC |
1511 | break; |
1512 | } | |
a2575bec CC |
1513 | |
1514 | switch (pr_type) | |
1515 | { | |
1516 | case elfcpp::GNU_PROPERTY_X86_ISA_1_USED: | |
a9fc784b | 1517 | this->object_isa_1_used_ |= val; |
a2575bec CC |
1518 | break; |
1519 | case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED: | |
1520 | this->isa_1_needed_ |= val; | |
1521 | break; | |
1522 | case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND: | |
1523 | // If we see multiple feature props in one object, OR them together. | |
1524 | this->object_feature_1_ |= val; | |
1525 | break; | |
586e3094 L |
1526 | case elfcpp::GNU_PROPERTY_X86_FEATURE_2_USED: |
1527 | this->object_feature_2_used_ |= val; | |
1528 | break; | |
1529 | case elfcpp::GNU_PROPERTY_X86_FEATURE_2_NEEDED: | |
1530 | this->feature_2_needed_ |= val; | |
1531 | break; | |
a2575bec CC |
1532 | } |
1533 | } | |
1534 | ||
1535 | // Merge the target-specific program properties from the current object. | |
1536 | template<int size> | |
1537 | void | |
1538 | Target_x86_64<size>::merge_gnu_properties(const Object*) | |
1539 | { | |
1540 | if (this->seen_first_object_) | |
a9fc784b CC |
1541 | { |
1542 | // If any object is missing the ISA_1_USED property, we must omit | |
1543 | // it from the output file. | |
1544 | if (this->object_isa_1_used_ == 0) | |
1545 | this->isa_1_used_ = 0; | |
1546 | else if (this->isa_1_used_ != 0) | |
1547 | this->isa_1_used_ |= this->object_isa_1_used_; | |
1548 | this->feature_1_ &= this->object_feature_1_; | |
586e3094 L |
1549 | // If any object is missing the FEATURE_2_USED property, we must |
1550 | // omit it from the output file. | |
1551 | if (this->object_feature_2_used_ == 0) | |
1552 | this->feature_2_used_ = 0; | |
1553 | else if (this->feature_2_used_ != 0) | |
1554 | this->feature_2_used_ |= this->object_feature_2_used_; | |
a9fc784b | 1555 | } |
a2575bec CC |
1556 | else |
1557 | { | |
a9fc784b | 1558 | this->isa_1_used_ = this->object_isa_1_used_; |
a2575bec | 1559 | this->feature_1_ = this->object_feature_1_; |
586e3094 | 1560 | this->feature_2_used_ = this->object_feature_2_used_; |
a2575bec CC |
1561 | this->seen_first_object_ = true; |
1562 | } | |
a9fc784b | 1563 | this->object_isa_1_used_ = 0; |
a2575bec | 1564 | this->object_feature_1_ = 0; |
586e3094 | 1565 | this->object_feature_2_used_ = 0; |
a2575bec CC |
1566 | } |
1567 | ||
1568 | static inline void | |
1569 | add_property(Layout* layout, unsigned int pr_type, uint32_t val) | |
1570 | { | |
1571 | unsigned char buf[4]; | |
1572 | elfcpp::Swap<32, false>::writeval(buf, val); | |
1573 | layout->add_gnu_property(elfcpp::NT_GNU_PROPERTY_TYPE_0, pr_type, 4, buf); | |
1574 | } | |
1575 | ||
1576 | // Finalize the target-specific program properties and add them back to | |
1577 | // the layout. | |
1578 | template<int size> | |
1579 | void | |
1580 | Target_x86_64<size>::do_finalize_gnu_properties(Layout* layout) const | |
1581 | { | |
1582 | if (this->isa_1_used_ != 0) | |
1583 | add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_USED, | |
1584 | this->isa_1_used_); | |
1585 | if (this->isa_1_needed_ != 0) | |
1586 | add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED, | |
1587 | this->isa_1_needed_); | |
1588 | if (this->feature_1_ != 0) | |
1589 | add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND, | |
1590 | this->feature_1_); | |
586e3094 L |
1591 | if (this->feature_2_used_ != 0) |
1592 | add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_2_USED, | |
1593 | this->feature_2_used_); | |
1594 | if (this->feature_2_needed_ != 0) | |
1595 | add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_2_NEEDED, | |
1596 | this->feature_2_needed_); | |
6c04fd9b CC |
1597 | } |
1598 | ||
57b2284c CC |
1599 | // Write the first three reserved words of the .got.plt section. |
1600 | // The remainder of the section is written while writing the PLT | |
1601 | // in Output_data_plt_i386::do_write. | |
1602 | ||
1603 | void | |
1604 | Output_data_got_plt_x86_64::do_write(Output_file* of) | |
1605 | { | |
1606 | // The first entry in the GOT is the address of the .dynamic section | |
1607 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1608 | // We saved space for them when we created the section in | |
1609 | // Target_x86_64::got_section. | |
1610 | const off_t got_file_offset = this->offset(); | |
1611 | gold_assert(this->data_size() >= 24); | |
1612 | unsigned char* const got_view = of->get_output_view(got_file_offset, 24); | |
1613 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1614 | uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1615 | elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr); | |
1616 | memset(got_view + 8, 0, 16); | |
1617 | of->write_output_view(got_file_offset, 24, got_view); | |
1618 | } | |
1619 | ||
4829d394 | 1620 | // Initialize the PLT section. |
2e30d253 | 1621 | |
fc51264f | 1622 | template<int size> |
4829d394 | 1623 | void |
fc51264f | 1624 | Output_data_plt_x86_64<size>::init(Layout* layout) |
2e30d253 | 1625 | { |
d98bc257 | 1626 | this->rel_ = new Reloc_section(false); |
2e30d253 | 1627 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
1628 | elfcpp::SHF_ALLOC, this->rel_, |
1629 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2e30d253 ILT |
1630 | } |
1631 | ||
fc51264f | 1632 | template<int size> |
2e30d253 | 1633 | void |
fc51264f | 1634 | Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os) |
2e30d253 | 1635 | { |
2e702c99 | 1636 | os->set_entsize(this->get_plt_entry_size()); |
2e30d253 ILT |
1637 | } |
1638 | ||
1639 | // Add an entry to the PLT. | |
1640 | ||
fc51264f | 1641 | template<int size> |
2e30d253 | 1642 | void |
fc51264f L |
1643 | Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout, |
1644 | Symbol* gsym) | |
2e30d253 ILT |
1645 | { |
1646 | gold_assert(!gsym->has_plt_offset()); | |
1647 | ||
4829d394 CC |
1648 | unsigned int plt_index; |
1649 | off_t plt_offset; | |
1650 | section_offset_type got_offset; | |
2e30d253 | 1651 | |
67181c72 ILT |
1652 | unsigned int* pcount; |
1653 | unsigned int offset; | |
1654 | unsigned int reserved; | |
57b2284c | 1655 | Output_section_data_build* got; |
67181c72 ILT |
1656 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1657 | && gsym->can_use_relative_reloc(false)) | |
1658 | { | |
1659 | pcount = &this->irelative_count_; | |
1660 | offset = 0; | |
1661 | reserved = 0; | |
1662 | got = this->got_irelative_; | |
1663 | } | |
1664 | else | |
1665 | { | |
1666 | pcount = &this->count_; | |
1667 | offset = 1; | |
1668 | reserved = 3; | |
1669 | got = this->got_plt_; | |
1670 | } | |
1671 | ||
4829d394 CC |
1672 | if (!this->is_data_size_valid()) |
1673 | { | |
67181c72 ILT |
1674 | // Note that when setting the PLT offset for a non-IRELATIVE |
1675 | // entry we skip the initial reserved PLT entry. | |
1676 | plt_index = *pcount + offset; | |
2e702c99 | 1677 | plt_offset = plt_index * this->get_plt_entry_size(); |
2e30d253 | 1678 | |
67181c72 | 1679 | ++*pcount; |
2e30d253 | 1680 | |
67181c72 ILT |
1681 | got_offset = (plt_index - offset + reserved) * 8; |
1682 | gold_assert(got_offset == got->current_data_size()); | |
2e30d253 | 1683 | |
4829d394 CC |
1684 | // Every PLT entry needs a GOT entry which points back to the PLT |
1685 | // entry (this will be changed by the dynamic linker, normally | |
1686 | // lazily when the function is called). | |
67181c72 | 1687 | got->set_current_data_size(got_offset + 8); |
4829d394 | 1688 | } |
7223e9ca ILT |
1689 | else |
1690 | { | |
67181c72 ILT |
1691 | // FIXME: This is probably not correct for IRELATIVE relocs. |
1692 | ||
4829d394 | 1693 | // For incremental updates, find an available slot. |
2e702c99 RM |
1694 | plt_offset = this->free_list_.allocate(this->get_plt_entry_size(), |
1695 | this->get_plt_entry_size(), 0); | |
4829d394 | 1696 | if (plt_offset == -1) |
e6455dfb CC |
1697 | gold_fallback(_("out of patch space (PLT);" |
1698 | " relink with --incremental-full")); | |
4829d394 CC |
1699 | |
1700 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
1701 | // can be calculated from the PLT index, adjusting for the three | |
1702 | // reserved entries at the beginning of the GOT. | |
2e702c99 | 1703 | plt_index = plt_offset / this->get_plt_entry_size() - 1; |
67181c72 | 1704 | got_offset = (plt_index - offset + reserved) * 8; |
7223e9ca | 1705 | } |
2e30d253 | 1706 | |
4829d394 CC |
1707 | gsym->set_plt_offset(plt_offset); |
1708 | ||
1709 | // Every PLT entry needs a reloc. | |
67181c72 | 1710 | this->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 | 1711 | |
2e30d253 ILT |
1712 | // Note that we don't need to save the symbol. The contents of the |
1713 | // PLT are independent of which symbols are used. The symbols only | |
1714 | // appear in the relocations. | |
1715 | } | |
1716 | ||
7223e9ca ILT |
1717 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1718 | // the PLT offset. | |
1719 | ||
fc51264f | 1720 | template<int size> |
7223e9ca | 1721 | unsigned int |
fc51264f | 1722 | Output_data_plt_x86_64<size>::add_local_ifunc_entry( |
67181c72 ILT |
1723 | Symbol_table* symtab, |
1724 | Layout* layout, | |
fc51264f | 1725 | Sized_relobj_file<size, false>* relobj, |
6fa2a40b | 1726 | unsigned int local_sym_index) |
7223e9ca | 1727 | { |
2e702c99 | 1728 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1729 | ++this->irelative_count_; |
7223e9ca | 1730 | |
67181c72 | 1731 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1732 | |
1733 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1734 | // entry. | |
67181c72 | 1735 | this->got_irelative_->set_current_data_size(got_offset + 8); |
7223e9ca ILT |
1736 | |
1737 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1738 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
1739 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
1740 | elfcpp::R_X86_64_IRELATIVE, | |
1741 | this->got_irelative_, got_offset, 0); | |
7223e9ca ILT |
1742 | |
1743 | return plt_offset; | |
1744 | } | |
1745 | ||
4829d394 CC |
1746 | // Add the relocation for a PLT entry. |
1747 | ||
fc51264f | 1748 | template<int size> |
4829d394 | 1749 | void |
fc51264f L |
1750 | Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab, |
1751 | Layout* layout, | |
1752 | Symbol* gsym, | |
1753 | unsigned int got_offset) | |
4829d394 CC |
1754 | { |
1755 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1756 | && gsym->can_use_relative_reloc(false)) | |
67181c72 ILT |
1757 | { |
1758 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
1759 | rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
1760 | this->got_irelative_, got_offset, 0); | |
1761 | } | |
4829d394 CC |
1762 | else |
1763 | { | |
1764 | gsym->set_needs_dynsym_entry(); | |
1765 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
1766 | got_offset, 0); | |
1767 | } | |
1768 | } | |
1769 | ||
e291e7b9 ILT |
1770 | // Return where the TLSDESC relocations should go, creating it if |
1771 | // necessary. These follow the JUMP_SLOT relocations. | |
1772 | ||
fc51264f L |
1773 | template<int size> |
1774 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1775 | Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout) | |
e291e7b9 ILT |
1776 | { |
1777 | if (this->tlsdesc_rel_ == NULL) | |
1778 | { | |
1779 | this->tlsdesc_rel_ = new Reloc_section(false); | |
1780 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1781 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 1782 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1783 | gold_assert(this->tlsdesc_rel_->output_section() |
1784 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1785 | } |
1786 | return this->tlsdesc_rel_; | |
1787 | } | |
1788 | ||
67181c72 ILT |
1789 | // Return where the IRELATIVE relocations should go in the PLT. These |
1790 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
1791 | ||
fc51264f L |
1792 | template<int size> |
1793 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1794 | Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab, | |
1795 | Layout* layout) | |
67181c72 ILT |
1796 | { |
1797 | if (this->irelative_rel_ == NULL) | |
1798 | { | |
1799 | // Make sure we have a place for the TLSDESC relocations, in | |
1800 | // case we see any later on. | |
1801 | this->rela_tlsdesc(layout); | |
1802 | this->irelative_rel_ = new Reloc_section(false); | |
1803 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1804 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1805 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1806 | gold_assert(this->irelative_rel_->output_section() | |
1807 | == this->rel_->output_section()); | |
1808 | ||
1809 | if (parameters->doing_static_link()) | |
1810 | { | |
1811 | // A statically linked executable will only have a .rela.plt | |
1812 | // section to hold R_X86_64_IRELATIVE relocs for | |
1813 | // STT_GNU_IFUNC symbols. The library will use these | |
1814 | // symbols to locate the IRELATIVE relocs at program startup | |
1815 | // time. | |
1816 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
1817 | Symbol_table::PREDEFINED, | |
1818 | this->irelative_rel_, 0, 0, | |
1819 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1820 | elfcpp::STV_HIDDEN, 0, false, true); | |
1821 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
1822 | Symbol_table::PREDEFINED, | |
1823 | this->irelative_rel_, 0, 0, | |
1824 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1825 | elfcpp::STV_HIDDEN, 0, true, true); | |
1826 | } | |
1827 | } | |
1828 | return this->irelative_rel_; | |
1829 | } | |
1830 | ||
1831 | // Return the PLT address to use for a global symbol. | |
1832 | ||
fc51264f | 1833 | template<int size> |
67181c72 | 1834 | uint64_t |
7a0c0a14 | 1835 | Output_data_plt_x86_64<size>::do_address_for_global(const Symbol* gsym) |
67181c72 ILT |
1836 | { |
1837 | uint64_t offset = 0; | |
1838 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1839 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1840 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1841 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1842 | } |
1843 | ||
1844 | // Return the PLT address to use for a local symbol. These are always | |
1845 | // IRELATIVE relocs. | |
1846 | ||
fc51264f | 1847 | template<int size> |
67181c72 | 1848 | uint64_t |
7a0c0a14 CC |
1849 | Output_data_plt_x86_64<size>::do_address_for_local(const Relobj* object, |
1850 | unsigned int r_sym) | |
67181c72 | 1851 | { |
19fec8c1 AM |
1852 | return (this->address() |
1853 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1854 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1855 | } |
1856 | ||
c2b45e22 | 1857 | // Set the final size. |
fc51264f | 1858 | template<int size> |
c2b45e22 | 1859 | void |
fc51264f | 1860 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1861 | { |
7a0c0a14 CC |
1862 | // Number of regular and IFUNC PLT entries, plus the first entry. |
1863 | unsigned int count = this->count_ + this->irelative_count_ + 1; | |
1864 | // Count the TLSDESC entry, if present. | |
c2b45e22 CC |
1865 | if (this->has_tlsdesc_entry()) |
1866 | ++count; | |
7a0c0a14 | 1867 | this->set_data_size(count * this->get_plt_entry_size()); |
c2b45e22 CC |
1868 | } |
1869 | ||
2e30d253 ILT |
1870 | // The first entry in the PLT for an executable. |
1871 | ||
fc51264f L |
1872 | template<int size> |
1873 | const unsigned char | |
2e702c99 | 1874 | Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] = |
2e30d253 ILT |
1875 | { |
1876 | // From AMD64 ABI Draft 0.98, page 76 | |
1877 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1878 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1879 | 0xff, 0x25, // jmp indirect |
1880 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1881 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1882 | }; | |
1883 | ||
2e702c99 RM |
1884 | template<int size> |
1885 | void | |
1886 | Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry( | |
1887 | unsigned char* pov, | |
1888 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1889 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
1890 | { | |
1891 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1892 | // We do a jmp relative to the PC at the end of this instruction. | |
1893 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1894 | (got_address + 8 | |
1895 | - (plt_address + 6))); | |
1896 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1897 | (got_address + 16 | |
1898 | - (plt_address + 12))); | |
1899 | } | |
1900 | ||
2e30d253 ILT |
1901 | // Subsequent entries in the PLT for an executable. |
1902 | ||
fc51264f L |
1903 | template<int size> |
1904 | const unsigned char | |
2e702c99 | 1905 | Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] = |
2e30d253 ILT |
1906 | { |
1907 | // From AMD64 ABI Draft 0.98, page 76 | |
1908 | 0xff, 0x25, // jmpq indirect | |
1909 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1910 | 0x68, // pushq immediate | |
1911 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1912 | 0xe9, // jmpq relative | |
1913 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1914 | }; | |
1915 | ||
2e702c99 RM |
1916 | template<int size> |
1917 | unsigned int | |
1918 | Output_data_plt_x86_64_standard<size>::do_fill_plt_entry( | |
1919 | unsigned char* pov, | |
1920 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1921 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1922 | unsigned int got_offset, | |
1923 | unsigned int plt_offset, | |
1924 | unsigned int plt_index) | |
1925 | { | |
9d585188 L |
1926 | // Check PC-relative offset overflow in PLT entry. |
1927 | uint64_t plt_got_pcrel_offset = (got_address + got_offset | |
1928 | - (plt_address + plt_offset + 6)); | |
1929 | if (Bits<32>::has_overflow(plt_got_pcrel_offset)) | |
1930 | gold_error(_("PC-relative offset overflow in PLT entry %d"), | |
1931 | plt_index + 1); | |
1932 | ||
2e702c99 RM |
1933 | memcpy(pov, plt_entry, plt_entry_size); |
1934 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
9d585188 | 1935 | plt_got_pcrel_offset); |
2e702c99 RM |
1936 | |
1937 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1938 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1939 | - (plt_offset + plt_entry_size)); | |
1940 | ||
1941 | return 6; | |
1942 | } | |
1943 | ||
c2b45e22 CC |
1944 | // The reserved TLSDESC entry in the PLT for an executable. |
1945 | ||
fc51264f L |
1946 | template<int size> |
1947 | const unsigned char | |
2e702c99 | 1948 | Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] = |
c2b45e22 CC |
1949 | { |
1950 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1951 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1952 | 0xff, 0x35, // pushq x(%rip) | |
1953 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1954 | 0xff, 0x25, // jmpq *y(%rip) | |
1955 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1956 | 0x0f, 0x1f, // nop | |
1957 | 0x40, 0 | |
1958 | }; | |
1959 | ||
2e702c99 RM |
1960 | template<int size> |
1961 | void | |
1962 | Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry( | |
1963 | unsigned char* pov, | |
1964 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1965 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1966 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
1967 | unsigned int tlsdesc_got_offset, | |
1968 | unsigned int plt_offset) | |
1969 | { | |
1970 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1971 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1972 | (got_address + 8 | |
1973 | - (plt_address + plt_offset | |
1974 | + 6))); | |
1975 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1976 | (got_base | |
1977 | + tlsdesc_got_offset | |
1978 | - (plt_address + plt_offset | |
1979 | + 12))); | |
1980 | } | |
1981 | ||
750ea5ed CC |
1982 | // Return the APLT address to use for a global symbol (for IBT). |
1983 | ||
1984 | template<int size> | |
1985 | uint64_t | |
1986 | Output_data_plt_x86_64_ibt<size>::do_address_for_global(const Symbol* gsym) | |
1987 | { | |
1988 | uint64_t offset = this->aplt_offset_; | |
1989 | // Convert the PLT offset into an APLT offset. | |
1990 | unsigned int plt_offset = gsym->plt_offset(); | |
1991 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1992 | && gsym->can_use_relative_reloc(false)) | |
1993 | offset += this->regular_count() * aplt_entry_size; | |
1994 | else | |
1995 | plt_offset -= plt_entry_size; | |
1996 | plt_offset = plt_offset / (plt_entry_size / aplt_entry_size); | |
1997 | return this->address() + offset + plt_offset; | |
1998 | } | |
1999 | ||
2000 | // Return the PLT address to use for a local symbol. These are always | |
2001 | // IRELATIVE relocs. | |
2002 | ||
2003 | template<int size> | |
2004 | uint64_t | |
2005 | Output_data_plt_x86_64_ibt<size>::do_address_for_local(const Relobj* object, | |
2006 | unsigned int r_sym) | |
2007 | { | |
2008 | // Convert the PLT offset into an APLT offset. | |
e977e747 L |
2009 | const Sized_relobj_file<size, false>* sized_relobj = |
2010 | static_cast<const Sized_relobj_file<size, false>*>(object); | |
2011 | const Symbol_value<size>* psymval = sized_relobj->local_symbol(r_sym); | |
2012 | unsigned int plt_offset = ((object->local_plt_offset(r_sym) | |
2013 | - (psymval->is_ifunc_symbol() | |
2014 | ? 0 : plt_entry_size)) | |
750ea5ed CC |
2015 | / (plt_entry_size / aplt_entry_size)); |
2016 | return (this->address() | |
2017 | + this->aplt_offset_ | |
2018 | + this->regular_count() * aplt_entry_size | |
2019 | + plt_offset); | |
2020 | } | |
2021 | ||
2022 | // Set the final size. | |
2023 | ||
2024 | template<int size> | |
2025 | void | |
2026 | Output_data_plt_x86_64_ibt<size>::set_final_data_size() | |
2027 | { | |
2028 | // Number of regular and IFUNC PLT entries. | |
2029 | unsigned int count = this->entry_count(); | |
2030 | // Count the first entry and the TLSDESC entry, if present. | |
2031 | unsigned int extra = this->has_tlsdesc_entry() ? 2 : 1; | |
2032 | unsigned int plt_size = (count + extra) * plt_entry_size; | |
2033 | // Offset of the APLT. | |
2034 | this->aplt_offset_ = plt_size; | |
2035 | // Size of the APLT. | |
2036 | plt_size += count * aplt_entry_size; | |
2037 | this->set_data_size(plt_size); | |
2038 | } | |
2039 | ||
2040 | // The first entry in the IBT PLT. | |
2041 | ||
1bf337ca | 2042 | template<int size> |
750ea5ed | 2043 | const unsigned char |
1bf337ca | 2044 | Output_data_plt_x86_64_ibt<size>::first_plt_entry[plt_entry_size] = |
750ea5ed | 2045 | { |
750ea5ed CC |
2046 | 0xff, 0x35, // pushq contents of memory address |
2047 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
2048 | 0xff, 0x25, // jmp indirect | |
2049 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2050 | 0x90, 0x90, 0x90, 0x90 // noop (x4) | |
2051 | }; | |
2052 | ||
750ea5ed CC |
2053 | template<int size> |
2054 | void | |
2055 | Output_data_plt_x86_64_ibt<size>::do_fill_first_plt_entry( | |
2056 | unsigned char* pov, | |
2057 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
2058 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
2059 | { | |
2060 | // Offsets to the addresses needing relocation. | |
2061 | const unsigned int roff1 = 2; | |
1bf337ca | 2062 | const unsigned int roff2 = 8; |
750ea5ed CC |
2063 | |
2064 | memcpy(pov, first_plt_entry, plt_entry_size); | |
2065 | // We do a jmp relative to the PC at the end of this instruction. | |
2066 | elfcpp::Swap_unaligned<32, false>::writeval(pov + roff1, | |
2067 | (got_address + 8 | |
2068 | - (plt_address + roff1 + 4))); | |
2069 | elfcpp::Swap<32, false>::writeval(pov + roff2, | |
2070 | (got_address + 16 | |
2071 | - (plt_address + roff2 + 4))); | |
2072 | } | |
2073 | ||
2074 | // Subsequent entries in the IBT PLT. | |
2075 | ||
1bf337ca | 2076 | template<int size> |
750ea5ed | 2077 | const unsigned char |
1bf337ca | 2078 | Output_data_plt_x86_64_ibt<size>::plt_entry[plt_entry_size] = |
750ea5ed CC |
2079 | { |
2080 | // From AMD64 ABI Draft 1.0-rc1, Chapter 13. | |
2081 | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 | |
2082 | 0x68, // pushq immediate | |
2083 | 0, 0, 0, 0, // replaced with offset into relocation table | |
2084 | 0xe9, // jmpq relative | |
2085 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
2086 | 0x90, 0x90 // nop | |
2087 | }; | |
2088 | ||
750ea5ed CC |
2089 | // Entries in the IBT Additional PLT. |
2090 | ||
1bf337ca | 2091 | template<int size> |
750ea5ed | 2092 | const unsigned char |
1bf337ca | 2093 | Output_data_plt_x86_64_ibt<size>::aplt_entry[aplt_entry_size] = |
750ea5ed CC |
2094 | { |
2095 | // From AMD64 ABI Draft 1.0-rc1, Chapter 13. | |
2096 | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 | |
2097 | 0xff, 0x25, // jmpq indirect | |
2098 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
2099 | 0x0f, 0x1f, 0x04, 0x00, // nop | |
2100 | 0x90, 0x90 // nop | |
2101 | }; | |
2102 | ||
750ea5ed CC |
2103 | template<int size> |
2104 | unsigned int | |
2105 | Output_data_plt_x86_64_ibt<size>::do_fill_plt_entry( | |
2106 | unsigned char* pov, | |
2107 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
2108 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
2109 | unsigned int, | |
2110 | unsigned int plt_offset, | |
2111 | unsigned int plt_index) | |
2112 | { | |
2113 | // Offsets to the addresses needing relocation. | |
2114 | const unsigned int roff1 = 5; | |
1bf337ca | 2115 | const unsigned int roff2 = 10; |
750ea5ed CC |
2116 | |
2117 | memcpy(pov, plt_entry, plt_entry_size); | |
2118 | elfcpp::Swap_unaligned<32, false>::writeval(pov + roff1, plt_index); | |
2119 | elfcpp::Swap<32, false>::writeval(pov + roff2, -(plt_offset + roff2 + 4)); | |
2120 | return 0; | |
2121 | } | |
2122 | ||
2123 | template<int size> | |
2124 | void | |
2125 | Output_data_plt_x86_64_ibt<size>::fill_aplt_entry( | |
2126 | unsigned char* pov, | |
2127 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
2128 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
2129 | unsigned int got_offset, | |
2130 | unsigned int plt_offset, | |
2131 | unsigned int plt_index) | |
2132 | { | |
2133 | // Offset to the address needing relocation. | |
1bf337ca | 2134 | const unsigned int roff = 6; |
750ea5ed CC |
2135 | |
2136 | // Check PC-relative offset overflow in PLT entry. | |
2137 | uint64_t plt_got_pcrel_offset = (got_address + got_offset | |
2138 | - (plt_address + plt_offset + roff + 4)); | |
2139 | if (Bits<32>::has_overflow(plt_got_pcrel_offset)) | |
2140 | gold_error(_("PC-relative offset overflow in APLT entry %d"), | |
2141 | plt_index + 1); | |
2142 | ||
2143 | memcpy(pov, aplt_entry, aplt_entry_size); | |
2144 | elfcpp::Swap_unaligned<32, false>::writeval(pov + roff, plt_got_pcrel_offset); | |
2145 | } | |
2146 | ||
2147 | // The reserved TLSDESC entry in the IBT PLT for an executable. | |
2148 | ||
2149 | template<int size> | |
2150 | const unsigned char | |
2151 | Output_data_plt_x86_64_ibt<size>::tlsdesc_plt_entry[plt_entry_size] = | |
2152 | { | |
2153 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
2154 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
4bccc875 | 2155 | 0xf3, 0x0f, 0x1e, 0xfa, // endbr64 |
750ea5ed CC |
2156 | 0xff, 0x35, // pushq x(%rip) |
2157 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
4bccc875 | 2158 | 0xff, 0x25, // jmpq *y(%rip) |
750ea5ed | 2159 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry |
750ea5ed CC |
2160 | }; |
2161 | ||
2162 | template<int size> | |
2163 | void | |
2164 | Output_data_plt_x86_64_ibt<size>::do_fill_tlsdesc_entry( | |
2165 | unsigned char* pov, | |
2166 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
2167 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
2168 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
2169 | unsigned int tlsdesc_got_offset, | |
2170 | unsigned int plt_offset) | |
2171 | { | |
2172 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
4bccc875 | 2173 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 6, |
750ea5ed CC |
2174 | (got_address + 8 |
2175 | - (plt_address + plt_offset | |
4bccc875 L |
2176 | + 10))); |
2177 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 12, | |
750ea5ed CC |
2178 | (got_base |
2179 | + tlsdesc_got_offset | |
2180 | - (plt_address + plt_offset | |
4bccc875 | 2181 | + 16))); |
750ea5ed CC |
2182 | } |
2183 | ||
07a60597 ILT |
2184 | // The .eh_frame unwind information for the PLT. |
2185 | ||
fc51264f | 2186 | template<int size> |
2e702c99 | 2187 | const unsigned char |
fc51264f | 2188 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
2189 | { |
2190 | 1, // CIE version. | |
2191 | 'z', // Augmentation: augmentation size included. | |
2192 | 'R', // Augmentation: FDE encoding included. | |
2193 | '\0', // End of augmentation string. | |
2194 | 1, // Code alignment factor. | |
2195 | 0x78, // Data alignment factor. | |
2196 | 16, // Return address column. | |
2197 | 1, // Augmentation size. | |
2198 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
2199 | | elfcpp::DW_EH_PE_sdata4), | |
2200 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
2201 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
2202 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
2203 | elfcpp::DW_CFA_nop | |
2204 | }; | |
2205 | ||
fc51264f | 2206 | template<int size> |
07a60597 | 2207 | const unsigned char |
2e702c99 | 2208 | Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
2209 | { |
2210 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
2211 | 0, 0, 0, 0, // Replaced with size of .plt. | |
2212 | 0, // Augmentation size. | |
2213 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
2214 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
2215 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
2216 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
2217 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
2218 | 11, // Block length. | |
2219 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
2220 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
2221 | elfcpp::DW_OP_lit15, // Push 0xf. | |
2222 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
2223 | elfcpp::DW_OP_lit11, // Push 0xb. | |
2224 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
2225 | elfcpp::DW_OP_lit3, // Push 3. | |
2226 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
2227 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
2228 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
2229 | elfcpp::DW_CFA_nop, | |
2230 | elfcpp::DW_CFA_nop, | |
2231 | elfcpp::DW_CFA_nop | |
2232 | }; | |
2233 | ||
8ad93045 | 2234 | // The .eh_frame unwind information for the PLT. |
750ea5ed CC |
2235 | template<int size> |
2236 | const unsigned char | |
2237 | Output_data_plt_x86_64_ibt<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
2238 | { | |
2239 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
2240 | 0, 0, 0, 0, // Replaced with size of .plt. | |
2241 | 0, // Augmentation size. | |
2242 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
2243 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
2244 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
2245 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
2246 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
2247 | 11, // Block length. | |
2248 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
2249 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
2250 | elfcpp::DW_OP_lit15, // Push 0xf. | |
2251 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
2252 | elfcpp::DW_OP_lit9, // Push 9. | |
2253 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 9) | |
2254 | elfcpp::DW_OP_lit3, // Push 3. | |
2255 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 9) << 3) | |
2256 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=9)<<3)+%rsp+8 | |
2257 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
2258 | elfcpp::DW_CFA_nop, | |
2259 | elfcpp::DW_CFA_nop, | |
2260 | elfcpp::DW_CFA_nop | |
2261 | }; | |
2262 | ||
2e30d253 ILT |
2263 | // Write out the PLT. This uses the hand-coded instructions above, |
2264 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
2265 | ||
fc51264f | 2266 | template<int size> |
2e30d253 | 2267 | void |
fc51264f | 2268 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 2269 | { |
2ea97941 | 2270 | const off_t offset = this->offset(); |
fe8718a4 ILT |
2271 | const section_size_type oview_size = |
2272 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 2273 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
2274 | |
2275 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
2276 | gold_assert(parameters->incremental_update() |
2277 | || (got_file_offset + this->got_plt_->data_size() | |
2278 | == this->got_irelative_->offset())); | |
fe8718a4 | 2279 | const section_size_type got_size = |
67181c72 ILT |
2280 | convert_to_section_size_type(this->got_plt_->data_size() |
2281 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
2282 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
2283 | got_size); | |
2284 | ||
2285 | unsigned char* pov = oview; | |
2286 | ||
c2b45e22 | 2287 | // The base address of the .plt section. |
fc51264f | 2288 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 2289 | // The base address of the .got section. |
fc51264f | 2290 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
2291 | // The base address of the PLT portion of the .got section, |
2292 | // which is where the GOT pointer will point, and where the | |
2293 | // three reserved GOT entries are located. | |
fc51264f L |
2294 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
2295 | = this->got_plt_->address(); | |
2e30d253 | 2296 | |
2e702c99 RM |
2297 | this->fill_first_plt_entry(pov, got_address, plt_address); |
2298 | pov += this->get_plt_entry_size(); | |
2e30d253 | 2299 | |
57b2284c CC |
2300 | // The first three entries in the GOT are reserved, and are written |
2301 | // by Output_data_got_plt_x86_64::do_write. | |
2302 | unsigned char* got_pov = got_view + 24; | |
2e30d253 | 2303 | |
2e702c99 | 2304 | unsigned int plt_offset = this->get_plt_entry_size(); |
2e30d253 | 2305 | unsigned int got_offset = 24; |
67181c72 | 2306 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
2307 | for (unsigned int plt_index = 0; |
2308 | plt_index < count; | |
2309 | ++plt_index, | |
2e702c99 | 2310 | pov += this->get_plt_entry_size(), |
2e30d253 | 2311 | got_pov += 8, |
2e702c99 | 2312 | plt_offset += this->get_plt_entry_size(), |
2e30d253 ILT |
2313 | got_offset += 8) |
2314 | { | |
2315 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
2316 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
2317 | got_address, plt_address, | |
2318 | got_offset, plt_offset, | |
2319 | plt_index); | |
2e30d253 ILT |
2320 | |
2321 | // Set the entry in the GOT. | |
2e702c99 RM |
2322 | elfcpp::Swap<64, false>::writeval(got_pov, |
2323 | plt_address + plt_offset + lazy_offset); | |
2e30d253 ILT |
2324 | } |
2325 | ||
c2b45e22 CC |
2326 | if (this->has_tlsdesc_entry()) |
2327 | { | |
2328 | // Set and adjust the reserved TLSDESC PLT entry. | |
2329 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2e702c99 RM |
2330 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, |
2331 | tlsdesc_got_offset, plt_offset); | |
2332 | pov += this->get_plt_entry_size(); | |
c2b45e22 CC |
2333 | } |
2334 | ||
fe8718a4 ILT |
2335 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
2336 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 2337 | |
2ea97941 | 2338 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
2339 | of->write_output_view(got_file_offset, got_size, got_view); |
2340 | } | |
2341 | ||
750ea5ed CC |
2342 | // Write out the IBT PLT. |
2343 | ||
2344 | template<int size> | |
2345 | void | |
2346 | Output_data_plt_x86_64_ibt<size>::do_write(Output_file* of) | |
2347 | { | |
2348 | const off_t offset = this->offset(); | |
2349 | const section_size_type oview_size = | |
2350 | convert_to_section_size_type(this->data_size()); | |
2351 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
2352 | ||
2353 | Output_data_got<64, false>* got = this->got(); | |
2354 | Output_data_got_plt_x86_64* got_plt = this->got_plt(); | |
2355 | Output_data_space* got_irelative = this->got_irelative(); | |
2356 | ||
2357 | const off_t got_file_offset = got_plt->offset(); | |
2358 | gold_assert(parameters->incremental_update() | |
2359 | || (got_file_offset + got_plt->data_size() | |
2360 | == got_irelative->offset())); | |
2361 | const section_size_type got_size = | |
2362 | convert_to_section_size_type(got_plt->data_size() | |
2363 | + got_irelative->data_size()); | |
2364 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
2365 | got_size); | |
2366 | ||
2367 | unsigned char* pov = oview; | |
2368 | ||
2369 | // The base address of the .plt section. | |
2370 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); | |
2371 | // The base address of the .got section. | |
2372 | elfcpp::Elf_types<64>::Elf_Addr got_base = got->address(); | |
2373 | // The base address of the PLT portion of the .got section, | |
2374 | // which is where the GOT pointer will point, and where the | |
2375 | // three reserved GOT entries are located. | |
2376 | elfcpp::Elf_types<64>::Elf_Addr got_address = got_plt->address(); | |
2377 | ||
2378 | this->fill_first_plt_entry(pov, got_address, plt_address); | |
2379 | pov += plt_entry_size; | |
2380 | ||
2381 | // The first three entries in the GOT are reserved, and are written | |
2382 | // by Output_data_got_plt_x86_64::do_write. | |
2383 | unsigned char* got_pov = got_view + 24; | |
2384 | ||
2385 | unsigned int plt_offset = plt_entry_size; | |
2386 | unsigned int got_offset = 24; | |
2387 | const unsigned int count = this->entry_count(); | |
2388 | for (unsigned int plt_index = 0; | |
2389 | plt_index < count; | |
2390 | ++plt_index, | |
2391 | pov += plt_entry_size, | |
2392 | got_pov += 8, | |
2393 | plt_offset += plt_entry_size, | |
2394 | got_offset += 8) | |
7a0c0a14 CC |
2395 | { |
2396 | // Set and adjust the PLT entry itself. | |
750ea5ed CC |
2397 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
2398 | got_address, plt_address, | |
2399 | got_offset, plt_offset, | |
2400 | plt_index); | |
2401 | ||
2402 | // Set the entry in the GOT. | |
2403 | elfcpp::Swap<64, false>::writeval(got_pov, | |
2404 | plt_address + plt_offset + lazy_offset); | |
2405 | } | |
2406 | ||
2407 | if (this->has_tlsdesc_entry()) | |
2408 | { | |
2409 | // Set and adjust the reserved TLSDESC PLT entry. | |
2410 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2411 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, | |
2412 | tlsdesc_got_offset, plt_offset); | |
2413 | pov += this->get_plt_entry_size(); | |
48bc2182 | 2414 | plt_offset += plt_entry_size; |
750ea5ed CC |
2415 | } |
2416 | ||
2417 | // Write the additional PLT. | |
2418 | got_offset = 24; | |
2419 | for (unsigned int plt_index = 0; | |
2420 | plt_index < count; | |
2421 | ++plt_index, | |
2422 | pov += aplt_entry_size, | |
2423 | plt_offset += aplt_entry_size, | |
2424 | got_offset += 8) | |
2425 | { | |
2426 | // Set and adjust the APLT entry. | |
7a0c0a14 CC |
2427 | this->fill_aplt_entry(pov, got_address, plt_address, got_offset, |
2428 | plt_offset, plt_index); | |
2429 | } | |
2430 | ||
2431 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
2432 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2433 | ||
2434 | of->write_output_view(offset, oview_size, oview); | |
2435 | of->write_output_view(got_file_offset, got_size, got_view); | |
2436 | } | |
2437 | ||
c2b45e22 | 2438 | // Create the PLT section. |
2e30d253 | 2439 | |
fc51264f | 2440 | template<int size> |
2e30d253 | 2441 | void |
fc51264f | 2442 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 2443 | { |
2e30d253 ILT |
2444 | if (this->plt_ == NULL) |
2445 | { | |
2446 | // Create the GOT sections first. | |
2447 | this->got_section(symtab, layout); | |
2448 | ||
2e702c99 RM |
2449 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
2450 | this->got_irelative_); | |
2451 | ||
2452 | // Add unwind information if requested. | |
2453 | if (parameters->options().ld_generated_unwind_info()) | |
2454 | this->plt_->add_eh_frame(layout); | |
2455 | ||
2e30d253 ILT |
2456 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
2457 | (elfcpp::SHF_ALLOC | |
2458 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 2459 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
2460 | |
2461 | // Make the sh_info field of .rela.plt point to .plt. | |
2462 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
2463 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 2464 | } |
c2b45e22 CC |
2465 | } |
2466 | ||
7a0c0a14 CC |
2467 | template<> |
2468 | Output_data_plt_x86_64<32>* | |
2469 | Target_x86_64<32>::do_make_data_plt(Layout* layout, | |
2470 | Output_data_got<64, false>* got, | |
2471 | Output_data_got_plt_x86_64* got_plt, | |
2472 | Output_data_space* got_irelative) | |
2473 | { | |
750ea5ed CC |
2474 | if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT) |
2475 | return new Output_data_plt_x86_64_ibt<32>(layout, got, got_plt, | |
2476 | got_irelative); | |
7a0c0a14 CC |
2477 | return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt, |
2478 | got_irelative); | |
2479 | } | |
2480 | ||
2481 | template<> | |
2482 | Output_data_plt_x86_64<64>* | |
2483 | Target_x86_64<64>::do_make_data_plt(Layout* layout, | |
2484 | Output_data_got<64, false>* got, | |
2485 | Output_data_got_plt_x86_64* got_plt, | |
2486 | Output_data_space* got_irelative) | |
2487 | { | |
750ea5ed CC |
2488 | if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT) |
2489 | return new Output_data_plt_x86_64_ibt<64>(layout, got, got_plt, | |
2490 | got_irelative); | |
7a0c0a14 CC |
2491 | else |
2492 | return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt, | |
2493 | got_irelative); | |
2494 | } | |
2495 | ||
2496 | template<> | |
2497 | Output_data_plt_x86_64<32>* | |
2498 | Target_x86_64<32>::do_make_data_plt(Layout* layout, | |
2499 | Output_data_got<64, false>* got, | |
2500 | Output_data_got_plt_x86_64* got_plt, | |
2501 | Output_data_space* got_irelative, | |
2502 | unsigned int plt_count) | |
2503 | { | |
750ea5ed CC |
2504 | if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT) |
2505 | return new Output_data_plt_x86_64_ibt<32>(layout, got, got_plt, | |
2506 | got_irelative, plt_count); | |
7a0c0a14 | 2507 | return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt, |
750ea5ed | 2508 | got_irelative, plt_count); |
7a0c0a14 CC |
2509 | } |
2510 | ||
2511 | template<> | |
2512 | Output_data_plt_x86_64<64>* | |
2513 | Target_x86_64<64>::do_make_data_plt(Layout* layout, | |
2514 | Output_data_got<64, false>* got, | |
2515 | Output_data_got_plt_x86_64* got_plt, | |
2516 | Output_data_space* got_irelative, | |
2517 | unsigned int plt_count) | |
2518 | { | |
750ea5ed CC |
2519 | if (this->feature_1_ & elfcpp::GNU_PROPERTY_X86_FEATURE_1_IBT) |
2520 | return new Output_data_plt_x86_64_ibt<64>(layout, got, got_plt, | |
2521 | got_irelative, plt_count); | |
7a0c0a14 CC |
2522 | else |
2523 | return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt, | |
2524 | got_irelative, | |
2525 | plt_count); | |
2526 | } | |
2527 | ||
e291e7b9 ILT |
2528 | // Return the section for TLSDESC relocations. |
2529 | ||
fc51264f L |
2530 | template<int size> |
2531 | typename Target_x86_64<size>::Reloc_section* | |
2532 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
2533 | { |
2534 | return this->plt_section()->rela_tlsdesc(layout); | |
2535 | } | |
2536 | ||
c2b45e22 CC |
2537 | // Create a PLT entry for a global symbol. |
2538 | ||
fc51264f | 2539 | template<int size> |
c2b45e22 | 2540 | void |
fc51264f L |
2541 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
2542 | Symbol* gsym) | |
c2b45e22 CC |
2543 | { |
2544 | if (gsym->has_plt_offset()) | |
2545 | return; | |
2546 | ||
2547 | if (this->plt_ == NULL) | |
2548 | this->make_plt_section(symtab, layout); | |
2e30d253 | 2549 | |
67181c72 | 2550 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
2551 | } |
2552 | ||
7223e9ca ILT |
2553 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
2554 | ||
fc51264f | 2555 | template<int size> |
7223e9ca | 2556 | void |
fc51264f L |
2557 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
2558 | Symbol_table* symtab, Layout* layout, | |
2559 | Sized_relobj_file<size, false>* relobj, | |
2560 | unsigned int local_sym_index) | |
7223e9ca ILT |
2561 | { |
2562 | if (relobj->local_has_plt_offset(local_sym_index)) | |
2563 | return; | |
2564 | if (this->plt_ == NULL) | |
2565 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
2566 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
2567 | relobj, | |
7223e9ca ILT |
2568 | local_sym_index); |
2569 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
2570 | } | |
2571 | ||
0e70b911 CC |
2572 | // Return the number of entries in the PLT. |
2573 | ||
fc51264f | 2574 | template<int size> |
0e70b911 | 2575 | unsigned int |
fc51264f | 2576 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
2577 | { |
2578 | if (this->plt_ == NULL) | |
2579 | return 0; | |
2580 | return this->plt_->entry_count(); | |
2581 | } | |
2582 | ||
2583 | // Return the offset of the first non-reserved PLT entry. | |
2584 | ||
fc51264f | 2585 | template<int size> |
0e70b911 | 2586 | unsigned int |
fc51264f | 2587 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 2588 | { |
8474a88f L |
2589 | if (this->plt_ == NULL) |
2590 | return 0; | |
2e702c99 | 2591 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
2592 | } |
2593 | ||
2594 | // Return the size of each PLT entry. | |
2595 | ||
fc51264f | 2596 | template<int size> |
0e70b911 | 2597 | unsigned int |
fc51264f | 2598 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 2599 | { |
8474a88f L |
2600 | if (this->plt_ == NULL) |
2601 | return 0; | |
2e702c99 | 2602 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
2603 | } |
2604 | ||
4829d394 CC |
2605 | // Create the GOT and PLT sections for an incremental update. |
2606 | ||
fc51264f | 2607 | template<int size> |
dd74ae06 | 2608 | Output_data_got_base* |
fc51264f | 2609 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
2610 | Layout* layout, |
2611 | unsigned int got_count, | |
2612 | unsigned int plt_count) | |
2613 | { | |
2614 | gold_assert(this->got_ == NULL); | |
2615 | ||
2616 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
2617 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
2618 | (elfcpp::SHF_ALLOC | |
2619 | | elfcpp::SHF_WRITE), | |
2620 | this->got_, ORDER_RELRO_LAST, | |
2621 | true); | |
2622 | ||
2623 | // Add the three reserved entries. | |
57b2284c | 2624 | this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8); |
4829d394 CC |
2625 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
2626 | (elfcpp::SHF_ALLOC | |
2627 | | elfcpp::SHF_WRITE), | |
2628 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
2629 | false); | |
2630 | ||
2631 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
2632 | this->global_offset_table_ = | |
2633 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
2634 | Symbol_table::PREDEFINED, | |
2635 | this->got_plt_, | |
2636 | 0, 0, elfcpp::STT_OBJECT, | |
2637 | elfcpp::STB_LOCAL, | |
2638 | elfcpp::STV_HIDDEN, 0, | |
2639 | false, false); | |
2640 | ||
2641 | // If there are any TLSDESC relocations, they get GOT entries in | |
2642 | // .got.plt after the jump slot entries. | |
2643 | // FIXME: Get the count for TLSDESC entries. | |
2644 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
2645 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
2646 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
2647 | this->got_tlsdesc_, | |
2648 | ORDER_NON_RELRO_FIRST, false); | |
2649 | ||
67181c72 ILT |
2650 | // If there are any IRELATIVE relocations, they get GOT entries in |
2651 | // .got.plt after the jump slot and TLSDESC entries. | |
2652 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
2653 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
2654 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
2655 | this->got_irelative_, | |
2656 | ORDER_NON_RELRO_FIRST, false); | |
2657 | ||
4829d394 | 2658 | // Create the PLT section. |
2e702c99 RM |
2659 | this->plt_ = this->make_data_plt(layout, this->got_, |
2660 | this->got_plt_, | |
2661 | this->got_irelative_, | |
2662 | plt_count); | |
2663 | ||
2664 | // Add unwind information if requested. | |
2665 | if (parameters->options().ld_generated_unwind_info()) | |
2666 | this->plt_->add_eh_frame(layout); | |
2667 | ||
4829d394 CC |
2668 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
2669 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
2670 | this->plt_, ORDER_PLT, false); | |
2671 | ||
2672 | // Make the sh_info field of .rela.plt point to .plt. | |
2673 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
2674 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2675 | ||
6fa2a40b CC |
2676 | // Create the rela_dyn section. |
2677 | this->rela_dyn_section(layout); | |
2678 | ||
4829d394 CC |
2679 | return this->got_; |
2680 | } | |
2681 | ||
6fa2a40b CC |
2682 | // Reserve a GOT entry for a local symbol, and regenerate any |
2683 | // necessary dynamic relocations. | |
2684 | ||
fc51264f | 2685 | template<int size> |
6fa2a40b | 2686 | void |
fc51264f | 2687 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 2688 | unsigned int got_index, |
fc51264f | 2689 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
2690 | unsigned int r_sym, |
2691 | unsigned int got_type) | |
2692 | { | |
2693 | unsigned int got_offset = got_index * 8; | |
2694 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
2695 | ||
2696 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
2697 | switch (got_type) | |
2698 | { | |
2699 | case GOT_TYPE_STANDARD: | |
2700 | if (parameters->options().output_is_position_independent()) | |
2701 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2702 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2703 | break; |
2704 | case GOT_TYPE_TLS_OFFSET: | |
2705 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
2706 | this->got_, got_offset, 0); | |
2707 | break; | |
2708 | case GOT_TYPE_TLS_PAIR: | |
2709 | this->got_->reserve_slot(got_index + 1); | |
2710 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
2711 | this->got_, got_offset, 0); | |
2712 | break; | |
2713 | case GOT_TYPE_TLS_DESC: | |
2714 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
2715 | // this->got_->reserve_slot(got_index + 1); | |
2716 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2717 | // this->got_, got_offset, 0); | |
2718 | break; | |
2719 | default: | |
2720 | gold_unreachable(); | |
2721 | } | |
2722 | } | |
2723 | ||
2724 | // Reserve a GOT entry for a global symbol, and regenerate any | |
2725 | // necessary dynamic relocations. | |
2726 | ||
fc51264f | 2727 | template<int size> |
6fa2a40b | 2728 | void |
fc51264f L |
2729 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
2730 | Symbol* gsym, | |
2731 | unsigned int got_type) | |
6fa2a40b CC |
2732 | { |
2733 | unsigned int got_offset = got_index * 8; | |
2734 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
2735 | ||
2736 | this->got_->reserve_global(got_index, gsym, got_type); | |
2737 | switch (got_type) | |
2738 | { | |
2739 | case GOT_TYPE_STANDARD: | |
2740 | if (!gsym->final_value_is_known()) | |
2741 | { | |
2742 | if (gsym->is_from_dynobj() | |
2743 | || gsym->is_undefined() | |
2744 | || gsym->is_preemptible() | |
2745 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2746 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
2747 | this->got_, got_offset, 0); | |
2748 | else | |
2749 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 2750 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2751 | } |
2752 | break; | |
2753 | case GOT_TYPE_TLS_OFFSET: | |
2754 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
13cf9988 | 2755 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2756 | break; |
2757 | case GOT_TYPE_TLS_PAIR: | |
2758 | this->got_->reserve_slot(got_index + 1); | |
2759 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
13cf9988 | 2760 | this->got_, got_offset, 0, false); |
6fa2a40b | 2761 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, |
13cf9988 | 2762 | this->got_, got_offset + 8, 0, false); |
6fa2a40b CC |
2763 | break; |
2764 | case GOT_TYPE_TLS_DESC: | |
2765 | this->got_->reserve_slot(got_index + 1); | |
2766 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
13cf9988 | 2767 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2768 | break; |
2769 | default: | |
2770 | gold_unreachable(); | |
2771 | } | |
2772 | } | |
2773 | ||
4829d394 CC |
2774 | // Register an existing PLT entry for a global symbol. |
2775 | ||
fc51264f | 2776 | template<int size> |
4829d394 | 2777 | void |
fc51264f L |
2778 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
2779 | Layout* layout, | |
2780 | unsigned int plt_index, | |
2781 | Symbol* gsym) | |
4829d394 CC |
2782 | { |
2783 | gold_assert(this->plt_ != NULL); | |
2784 | gold_assert(!gsym->has_plt_offset()); | |
2785 | ||
2786 | this->plt_->reserve_slot(plt_index); | |
2787 | ||
2788 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
2789 | ||
2790 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 2791 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
2792 | } |
2793 | ||
26d3c67d CC |
2794 | // Force a COPY relocation for a given symbol. |
2795 | ||
fc51264f | 2796 | template<int size> |
26d3c67d | 2797 | void |
fc51264f | 2798 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
2799 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
2800 | { | |
2801 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 2802 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
2803 | os, |
2804 | offset, | |
2805 | this->rela_dyn_section(NULL)); | |
2806 | } | |
2807 | ||
9fa33bee | 2808 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 2809 | |
fc51264f | 2810 | template<int size> |
edfbb029 | 2811 | void |
fc51264f L |
2812 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
2813 | Layout* layout) | |
edfbb029 CC |
2814 | { |
2815 | if (this->tls_base_symbol_defined_) | |
2816 | return; | |
2817 | ||
2818 | Output_segment* tls_segment = layout->tls_segment(); | |
2819 | if (tls_segment != NULL) | |
2820 | { | |
183fd0e3 | 2821 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 2822 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 2823 | Symbol_table::PREDEFINED, |
edfbb029 CC |
2824 | tls_segment, 0, 0, |
2825 | elfcpp::STT_TLS, | |
2826 | elfcpp::STB_LOCAL, | |
2827 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
2828 | (is_exec |
2829 | ? Symbol::SEGMENT_END | |
2830 | : Symbol::SEGMENT_START), | |
2831 | true); | |
edfbb029 CC |
2832 | } |
2833 | this->tls_base_symbol_defined_ = true; | |
2834 | } | |
2835 | ||
c2b45e22 CC |
2836 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
2837 | ||
fc51264f | 2838 | template<int size> |
c2b45e22 | 2839 | void |
fc51264f | 2840 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
2e702c99 | 2841 | Layout* layout) |
c2b45e22 CC |
2842 | { |
2843 | if (this->plt_ == NULL) | |
2844 | this->make_plt_section(symtab, layout); | |
2845 | ||
2846 | if (!this->plt_->has_tlsdesc_entry()) | |
2847 | { | |
2848 | // Allocate the TLSDESC_GOT entry. | |
2849 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2850 | unsigned int got_offset = got->add_constant(0); | |
2851 | ||
2852 | // Allocate the TLSDESC_PLT entry. | |
2853 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
2854 | } | |
2855 | } | |
2856 | ||
31d60480 ILT |
2857 | // Create a GOT entry for the TLS module index. |
2858 | ||
fc51264f | 2859 | template<int size> |
31d60480 | 2860 | unsigned int |
fc51264f L |
2861 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
2862 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
2863 | { |
2864 | if (this->got_mod_index_offset_ == -1U) | |
2865 | { | |
2866 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
2867 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
2868 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2869 | unsigned int got_offset = got->add_constant(0); | |
2870 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
2e702c99 | 2871 | got_offset, 0); |
009a67a2 | 2872 | got->add_constant(0); |
31d60480 ILT |
2873 | this->got_mod_index_offset_ = got_offset; |
2874 | } | |
2875 | return this->got_mod_index_offset_; | |
2876 | } | |
2877 | ||
2e30d253 ILT |
2878 | // Optimize the TLS relocation type based on what we know about the |
2879 | // symbol. IS_FINAL is true if the final address of this symbol is | |
2880 | // known at link time. | |
2881 | ||
fc51264f | 2882 | template<int size> |
e041f13d | 2883 | tls::Tls_optimization |
fc51264f | 2884 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 2885 | { |
2e30d253 ILT |
2886 | // If we are generating a shared library, then we can't do anything |
2887 | // in the linker. | |
8851ecca | 2888 | if (parameters->options().shared()) |
e041f13d | 2889 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2890 | |
2891 | switch (r_type) | |
2892 | { | |
2893 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
2894 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2895 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2896 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
2897 | // access. Since we know that we are generating an executable, |
2898 | // we can convert this to Initial-Exec. If we also know that | |
2899 | // this is a local symbol, we can further switch to Local-Exec. | |
2900 | if (is_final) | |
e041f13d ILT |
2901 | return tls::TLSOPT_TO_LE; |
2902 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 2903 | |
d61c17ea | 2904 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
2905 | // This is Local-Dynamic, which refers to a local symbol in the |
2906 | // dynamic TLS block. Since we know that we generating an | |
2907 | // executable, we can switch to Local-Exec. | |
e041f13d | 2908 | return tls::TLSOPT_TO_LE; |
2e30d253 | 2909 | |
0ffd9845 | 2910 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
2911 | case elfcpp::R_X86_64_DTPOFF64: |
2912 | // Another Local-Dynamic reloc. | |
e041f13d | 2913 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 2914 | |
d61c17ea | 2915 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
2916 | // These are Initial-Exec relocs which get the thread offset |
2917 | // from the GOT. If we know that we are linking against the | |
2918 | // local symbol, we can switch to Local-Exec, which links the | |
2919 | // thread offset into the instruction. | |
2920 | if (is_final) | |
e041f13d ILT |
2921 | return tls::TLSOPT_TO_LE; |
2922 | return tls::TLSOPT_NONE; | |
2e30d253 | 2923 | |
d61c17ea | 2924 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
2925 | // When we already have Local-Exec, there is nothing further we |
2926 | // can do. | |
e041f13d | 2927 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2928 | |
2929 | default: | |
2930 | gold_unreachable(); | |
2931 | } | |
2e30d253 ILT |
2932 | } |
2933 | ||
95a2c8d6 RS |
2934 | // Get the Reference_flags for a particular relocation. |
2935 | ||
fc51264f | 2936 | template<int size> |
95a2c8d6 | 2937 | int |
fc51264f | 2938 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
2939 | { |
2940 | switch (r_type) | |
2941 | { | |
2942 | case elfcpp::R_X86_64_NONE: | |
2943 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
2944 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2945 | case elfcpp::R_X86_64_GOTPC32: | |
2946 | case elfcpp::R_X86_64_GOTPC64: | |
2947 | // No symbol reference. | |
2948 | return 0; | |
2949 | ||
2950 | case elfcpp::R_X86_64_64: | |
2951 | case elfcpp::R_X86_64_32: | |
2952 | case elfcpp::R_X86_64_32S: | |
2953 | case elfcpp::R_X86_64_16: | |
2954 | case elfcpp::R_X86_64_8: | |
2955 | return Symbol::ABSOLUTE_REF; | |
2956 | ||
2957 | case elfcpp::R_X86_64_PC64: | |
2958 | case elfcpp::R_X86_64_PC32: | |
2959 | case elfcpp::R_X86_64_PC16: | |
2960 | case elfcpp::R_X86_64_PC8: | |
2961 | case elfcpp::R_X86_64_GOTOFF64: | |
2962 | return Symbol::RELATIVE_REF; | |
2963 | ||
2964 | case elfcpp::R_X86_64_PLT32: | |
2965 | case elfcpp::R_X86_64_PLTOFF64: | |
2966 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
2967 | ||
2968 | case elfcpp::R_X86_64_GOT64: | |
2969 | case elfcpp::R_X86_64_GOT32: | |
2970 | case elfcpp::R_X86_64_GOTPCREL64: | |
2971 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
2972 | case elfcpp::R_X86_64_GOTPCRELX: |
2973 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
95a2c8d6 RS |
2974 | case elfcpp::R_X86_64_GOTPLT64: |
2975 | // Absolute in GOT. | |
2976 | return Symbol::ABSOLUTE_REF; | |
2977 | ||
2978 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2979 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2980 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2981 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2982 | case elfcpp::R_X86_64_DTPOFF32: | |
2983 | case elfcpp::R_X86_64_DTPOFF64: | |
2984 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2985 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2986 | return Symbol::TLS_REF; | |
2987 | ||
2988 | case elfcpp::R_X86_64_COPY: | |
2989 | case elfcpp::R_X86_64_GLOB_DAT: | |
2990 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2991 | case elfcpp::R_X86_64_RELATIVE: | |
2992 | case elfcpp::R_X86_64_IRELATIVE: | |
2993 | case elfcpp::R_X86_64_TPOFF64: | |
2994 | case elfcpp::R_X86_64_DTPMOD64: | |
2995 | case elfcpp::R_X86_64_TLSDESC: | |
2996 | case elfcpp::R_X86_64_SIZE32: | |
2997 | case elfcpp::R_X86_64_SIZE64: | |
2998 | default: | |
2999 | // Not expected. We will give an error later. | |
3000 | return 0; | |
3001 | } | |
3002 | } | |
3003 | ||
e041f13d ILT |
3004 | // Report an unsupported relocation against a local symbol. |
3005 | ||
fc51264f | 3006 | template<int size> |
e041f13d | 3007 | void |
fc51264f L |
3008 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
3009 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 3010 | unsigned int r_type) |
e041f13d | 3011 | { |
75f2446e ILT |
3012 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
3013 | object->name().c_str(), r_type); | |
e041f13d ILT |
3014 | } |
3015 | ||
a036edd8 ILT |
3016 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
3017 | // dynamic linker does not support it, issue an error. The GNU linker | |
3018 | // only issues a non-PIC error for an allocated read-only section. | |
3019 | // Here we know the section is allocated, but we don't know that it is | |
3020 | // read-only. But we check for all the relocation types which the | |
3021 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
3022 | // error even if the section is not read-only. If GSYM is not NULL, |
3023 | // it is the symbol the relocation is against; if it is NULL, the | |
3024 | // relocation is against a local symbol. | |
a036edd8 | 3025 | |
fc51264f | 3026 | template<int size> |
a036edd8 | 3027 | void |
fc51264f L |
3028 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
3029 | Symbol* gsym) | |
a036edd8 ILT |
3030 | { |
3031 | switch (r_type) | |
3032 | { | |
2fbb4320 ILT |
3033 | // These are the relocation types supported by glibc for x86_64 |
3034 | // which should always work. | |
a036edd8 | 3035 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 3036 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
3037 | case elfcpp::R_X86_64_GLOB_DAT: |
3038 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3039 | case elfcpp::R_X86_64_DTPMOD64: | |
3040 | case elfcpp::R_X86_64_DTPOFF64: | |
3041 | case elfcpp::R_X86_64_TPOFF64: | |
3042 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
3043 | case elfcpp::R_X86_64_COPY: |
3044 | return; | |
3045 | ||
3046 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 3047 | case elfcpp::R_X86_64_PC32: |
a29b0dad ILT |
3048 | // A PC relative reference is OK against a local symbol or if |
3049 | // the symbol is defined locally. | |
3050 | if (gsym == NULL | |
3051 | || (!gsym->is_from_dynobj() | |
3052 | && !gsym->is_undefined() | |
3053 | && !gsym->is_preemptible())) | |
3054 | return; | |
d8e90251 | 3055 | // Fall through. |
a29b0dad | 3056 | case elfcpp::R_X86_64_32: |
3660ff06 L |
3057 | // R_X86_64_32 is OK for x32. |
3058 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
3059 | return; | |
2fbb4320 ILT |
3060 | if (this->issued_non_pic_error_) |
3061 | return; | |
3062 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
3063 | if (gsym == NULL) |
3064 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
3065 | "overflow at runtime; recompile with -fPIC")); | |
3066 | else | |
f49fe902 L |
3067 | { |
3068 | const char *r_name; | |
3069 | switch (r_type) | |
3070 | { | |
3071 | case elfcpp::R_X86_64_32: | |
3072 | r_name = "R_X86_64_32"; | |
3073 | break; | |
3074 | case elfcpp::R_X86_64_PC32: | |
3075 | r_name = "R_X86_64_PC32"; | |
3076 | break; | |
f49fe902 L |
3077 | default: |
3078 | gold_unreachable(); | |
3079 | break; | |
3080 | } | |
3081 | object->error(_("requires dynamic %s reloc against '%s' " | |
3082 | "which may overflow at runtime; recompile " | |
3083 | "with -fPIC"), | |
3084 | r_name, gsym->name()); | |
3085 | } | |
2fbb4320 | 3086 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
3087 | return; |
3088 | ||
3089 | default: | |
3090 | // This prevents us from issuing more than one error per reloc | |
3091 | // section. But we can still wind up issuing more than one | |
3092 | // error per object file. | |
3093 | if (this->issued_non_pic_error_) | |
2e702c99 | 3094 | return; |
33aea2fd | 3095 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad | 3096 | object->error(_("requires unsupported dynamic reloc %u; " |
2e702c99 | 3097 | "recompile with -fPIC"), |
a29b0dad | 3098 | r_type); |
a036edd8 ILT |
3099 | this->issued_non_pic_error_ = true; |
3100 | return; | |
3101 | ||
3102 | case elfcpp::R_X86_64_NONE: | |
3103 | gold_unreachable(); | |
3104 | } | |
3105 | } | |
3106 | ||
7223e9ca ILT |
3107 | // Return whether we need to make a PLT entry for a relocation of the |
3108 | // given type against a STT_GNU_IFUNC symbol. | |
3109 | ||
fc51264f | 3110 | template<int size> |
7223e9ca | 3111 | bool |
fc51264f L |
3112 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
3113 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 3114 | unsigned int r_type) |
7223e9ca | 3115 | { |
95a2c8d6 RS |
3116 | int flags = Scan::get_reference_flags(r_type); |
3117 | if (flags & Symbol::TLS_REF) | |
3118 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 3119 | object->name().c_str(), r_type); |
95a2c8d6 | 3120 | return flags != 0; |
7223e9ca ILT |
3121 | } |
3122 | ||
2e30d253 ILT |
3123 | // Scan a relocation for a local symbol. |
3124 | ||
fc51264f | 3125 | template<int size> |
2e30d253 | 3126 | inline void |
fc51264f L |
3127 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
3128 | Layout* layout, | |
3129 | Target_x86_64<size>* target, | |
3130 | Sized_relobj_file<size, false>* object, | |
3131 | unsigned int data_shndx, | |
3132 | Output_section* output_section, | |
3133 | const elfcpp::Rela<size, false>& reloc, | |
3134 | unsigned int r_type, | |
bfdfa4cd AM |
3135 | const elfcpp::Sym<size, false>& lsym, |
3136 | bool is_discarded) | |
2e30d253 | 3137 | { |
bfdfa4cd AM |
3138 | if (is_discarded) |
3139 | return; | |
3140 | ||
7223e9ca | 3141 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
3142 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
3143 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 3144 | { |
fc51264f | 3145 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
3146 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
3147 | } | |
3148 | ||
2e30d253 ILT |
3149 | switch (r_type) |
3150 | { | |
3151 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3152 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3153 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3154 | break; |
3155 | ||
3156 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 3157 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
3158 | // executable), we need to create a dynamic relocation for this |
3159 | // location. The relocation applied at link time will apply the | |
3160 | // link-time value, so we flag the location with an | |
3161 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 3162 | // relocate it easily. |
8851ecca | 3163 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
3164 | { |
3165 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
3166 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca | 3167 | rela_dyn->add_local_relative(object, r_sym, |
62fe925a | 3168 | (size == 32 |
fd885f3a L |
3169 | ? elfcpp::R_X86_64_RELATIVE64 |
3170 | : elfcpp::R_X86_64_RELATIVE), | |
7223e9ca ILT |
3171 | output_section, data_shndx, |
3172 | reloc.get_r_offset(), | |
397b129b | 3173 | reloc.get_r_addend(), is_ifunc); |
2e702c99 | 3174 | } |
d61c6bd4 ILT |
3175 | break; |
3176 | ||
2e30d253 ILT |
3177 | case elfcpp::R_X86_64_32: |
3178 | case elfcpp::R_X86_64_32S: | |
3179 | case elfcpp::R_X86_64_16: | |
3180 | case elfcpp::R_X86_64_8: | |
96f2030e | 3181 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
3182 | // executable), we need to create a dynamic relocation for this |
3183 | // location. We can't use an R_X86_64_RELATIVE relocation | |
3184 | // because that is always a 64-bit relocation. | |
8851ecca | 3185 | if (parameters->options().output_is_position_independent()) |
2e702c99 | 3186 | { |
3660ff06 L |
3187 | // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32. |
3188 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
3189 | { | |
3190 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
3191 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
3192 | rela_dyn->add_local_relative(object, r_sym, | |
3193 | elfcpp::R_X86_64_RELATIVE, | |
3194 | output_section, data_shndx, | |
3195 | reloc.get_r_offset(), | |
3196 | reloc.get_r_addend(), is_ifunc); | |
3197 | break; | |
3198 | } | |
3199 | ||
2e702c99 | 3200 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 3201 | |
2e702c99 | 3202 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 3203 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
2e702c99 | 3204 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
3205 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
3206 | data_shndx, reloc.get_r_offset(), | |
3207 | reloc.get_r_addend()); | |
2e702c99 RM |
3208 | else |
3209 | { | |
3210 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
3211 | unsigned int shndx = lsym.get_st_shndx(); |
3212 | bool is_ordinary; | |
3213 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
3214 | &is_ordinary); | |
3215 | if (!is_ordinary) | |
3216 | object->error(_("section symbol %u has bad shndx %u"), | |
3217 | r_sym, shndx); | |
3218 | else | |
3219 | rela_dyn->add_local_section(object, shndx, | |
3220 | r_type, output_section, | |
3221 | data_shndx, reloc.get_r_offset(), | |
3222 | reloc.get_r_addend()); | |
2e702c99 RM |
3223 | } |
3224 | } | |
2e30d253 ILT |
3225 | break; |
3226 | ||
3227 | case elfcpp::R_X86_64_PC64: | |
3228 | case elfcpp::R_X86_64_PC32: | |
3229 | case elfcpp::R_X86_64_PC16: | |
3230 | case elfcpp::R_X86_64_PC8: | |
3231 | break; | |
3232 | ||
f389a824 ILT |
3233 | case elfcpp::R_X86_64_PLT32: |
3234 | // Since we know this is a local symbol, we can handle this as a | |
3235 | // PC32 reloc. | |
3236 | break; | |
3237 | ||
fdc2f80f | 3238 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 3239 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
3240 | case elfcpp::R_X86_64_GOTPC64: |
3241 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
3242 | // We need a GOT section. |
3243 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
3244 | // For PLTOFF64, we'd normally want a PLT section, but since we |
3245 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
3246 | break; |
3247 | ||
0ffd9845 ILT |
3248 | case elfcpp::R_X86_64_GOT64: |
3249 | case elfcpp::R_X86_64_GOT32: | |
3250 | case elfcpp::R_X86_64_GOTPCREL64: | |
3251 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3252 | case elfcpp::R_X86_64_GOTPCRELX: |
3253 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ee9e9e86 | 3254 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 3255 | { |
1fa29f10 | 3256 | // The symbol requires a GOT section. |
2e702c99 | 3257 | Output_data_got<64, false>* got = target->got_section(symtab, layout); |
1fa29f10 IT |
3258 | |
3259 | // If the relocation symbol isn't IFUNC, | |
3260 | // and is local, then we will convert | |
3261 | // mov foo@GOTPCREL(%rip), %reg | |
3262 | // to lea foo(%rip), %reg. | |
3263 | // in Relocate::relocate. | |
158600eb CC |
3264 | if (!parameters->incremental() |
3265 | && (r_type == elfcpp::R_X86_64_GOTPCREL | |
3266 | || r_type == elfcpp::R_X86_64_GOTPCRELX | |
3267 | || r_type == elfcpp::R_X86_64_REX_GOTPCRELX) | |
568cbddc | 3268 | && reloc.get_r_addend() == -4 |
1fa29f10 IT |
3269 | && reloc.get_r_offset() >= 2 |
3270 | && !is_ifunc) | |
3271 | { | |
3272 | section_size_type stype; | |
3273 | const unsigned char* view = object->section_contents(data_shndx, | |
3274 | &stype, true); | |
3275 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
3276 | break; | |
3277 | } | |
3278 | ||
1fa29f10 | 3279 | // The symbol requires a GOT entry. |
2e702c99 | 3280 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
3281 | |
3282 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
3283 | // lets function pointers compare correctly with shared | |
3284 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
3285 | bool is_new; | |
397b129b | 3286 | if (is_ifunc) |
7223e9ca ILT |
3287 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
3288 | else | |
3289 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
3290 | if (is_new) |
3291 | { | |
3292 | // If we are generating a shared object, we need to add a | |
3293 | // dynamic relocation for this symbol's GOT entry. | |
3294 | if (parameters->options().output_is_position_independent()) | |
3295 | { | |
3296 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
3297 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
3298 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
3299 | { |
3300 | unsigned int got_offset = | |
3301 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
3302 | rela_dyn->add_local_relative(object, r_sym, | |
3303 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 3304 | got, got_offset, 0, is_ifunc); |
7223e9ca | 3305 | } |
2e702c99 RM |
3306 | else |
3307 | { | |
3308 | this->check_non_pic(object, r_type, NULL); | |
3309 | ||
3310 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
3311 | rela_dyn->add_local( | |
3312 | object, r_sym, r_type, got, | |
3313 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
3314 | } | |
3315 | } | |
3316 | } | |
3317 | // For GOTPLT64, we'd normally want a PLT section, but since | |
3318 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
3319 | } |
3320 | break; | |
3321 | ||
2e30d253 ILT |
3322 | case elfcpp::R_X86_64_COPY: |
3323 | case elfcpp::R_X86_64_GLOB_DAT: | |
3324 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3325 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3326 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3327 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3328 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3329 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3330 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3331 | gold_error(_("%s: unexpected reloc %u in object file"), |
3332 | object->name().c_str(), r_type); | |
2e30d253 ILT |
3333 | break; |
3334 | ||
d61c17ea | 3335 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3336 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3337 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3338 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3339 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3340 | case elfcpp::R_X86_64_DTPOFF32: |
3341 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3342 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3343 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 3344 | { |
8851ecca | 3345 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 3346 | const tls::Tls_optimization optimized_type |
2e702c99 | 3347 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
fc51264f | 3348 | r_type); |
2e30d253 ILT |
3349 | switch (r_type) |
3350 | { | |
2e702c99 RM |
3351 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
3352 | if (optimized_type == tls::TLSOPT_NONE) | |
3353 | { | |
3354 | // Create a pair of GOT entries for the module index and | |
3355 | // dtv-relative offset. | |
3356 | Output_data_got<64, false>* got | |
3357 | = target->got_section(symtab, layout); | |
3358 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
d491d34e ILT |
3359 | unsigned int shndx = lsym.get_st_shndx(); |
3360 | bool is_ordinary; | |
3361 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
3362 | if (!is_ordinary) | |
3363 | object->error(_("local symbol %u has bad shndx %u"), | |
3364 | r_sym, shndx); | |
2e702c99 | 3365 | else |
83896202 ILT |
3366 | got->add_local_pair_with_rel(object, r_sym, |
3367 | shndx, | |
3368 | GOT_TYPE_TLS_PAIR, | |
3369 | target->rela_dyn_section(layout), | |
bd73a62d | 3370 | elfcpp::R_X86_64_DTPMOD64); |
2e702c99 RM |
3371 | } |
3372 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 3373 | unsupported_reloc_local(object, r_type); |
2e702c99 | 3374 | break; |
7bf1f802 | 3375 | |
2e702c99 RM |
3376 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
3377 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
3378 | if (optimized_type == tls::TLSOPT_NONE) |
3379 | { | |
2e702c99 RM |
3380 | // Create reserved PLT and GOT entries for the resolver. |
3381 | target->reserve_tlsdesc_entries(symtab, layout); | |
3382 | ||
3383 | // Generate a double GOT entry with an | |
3384 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
3385 | // is resolved lazily, so the GOT entry needs to be in | |
3386 | // an area in .got.plt, not .got. Call got_section to | |
3387 | // make sure the section has been created. | |
a8df5856 | 3388 | target->got_section(symtab, layout); |
2e702c99 RM |
3389 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
3390 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
e291e7b9 ILT |
3391 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
3392 | { | |
3393 | unsigned int got_offset = got->add_constant(0); | |
3394 | got->add_constant(0); | |
3395 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
3396 | got_offset); | |
3397 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
3398 | // We store the arguments we need in a vector, and | |
3399 | // use the index into the vector as the parameter | |
3400 | // to pass to the target specific routines. | |
3401 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
3402 | void* arg = reinterpret_cast<void*>(intarg); | |
3403 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
3404 | got, got_offset, 0); | |
3405 | } | |
c2b45e22 CC |
3406 | } |
3407 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3408 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
3409 | break; |
3410 | ||
2e702c99 | 3411 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3412 | break; |
3413 | ||
2e702c99 | 3414 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3415 | if (optimized_type == tls::TLSOPT_NONE) |
3416 | { | |
2e702c99 RM |
3417 | // Create a GOT entry for the module index. |
3418 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3419 | } |
3420 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3421 | unsupported_reloc_local(object, r_type); | |
3422 | break; | |
3423 | ||
2e702c99 RM |
3424 | case elfcpp::R_X86_64_DTPOFF32: |
3425 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3426 | break; |
3427 | ||
2e702c99 | 3428 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3429 | layout->set_has_static_tls(); |
2e702c99 RM |
3430 | if (optimized_type == tls::TLSOPT_NONE) |
3431 | { | |
3432 | // Create a GOT entry for the tp-relative offset. | |
3433 | Output_data_got<64, false>* got | |
3434 | = target->got_section(symtab, layout); | |
3435 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
3436 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3437 | target->rela_dyn_section(layout), |
3438 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3439 | } |
3440 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3441 | unsupported_reloc_local(object, r_type); | |
3442 | break; | |
0ffd9845 | 3443 | |
2e702c99 | 3444 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3445 | layout->set_has_static_tls(); |
2e702c99 RM |
3446 | if (output_is_shared) |
3447 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 3448 | break; |
e041f13d | 3449 | |
2e702c99 RM |
3450 | default: |
3451 | gold_unreachable(); | |
2e30d253 ILT |
3452 | } |
3453 | } | |
3454 | break; | |
2e30d253 | 3455 | |
fdc2f80f ILT |
3456 | case elfcpp::R_X86_64_SIZE32: |
3457 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3458 | default: |
75f2446e ILT |
3459 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
3460 | object->name().c_str(), r_type); | |
2e30d253 ILT |
3461 | break; |
3462 | } | |
3463 | } | |
3464 | ||
3465 | ||
e041f13d ILT |
3466 | // Report an unsupported relocation against a global symbol. |
3467 | ||
fc51264f | 3468 | template<int size> |
e041f13d | 3469 | void |
fc51264f L |
3470 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
3471 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
3472 | unsigned int r_type, |
3473 | Symbol* gsym) | |
e041f13d | 3474 | { |
75f2446e | 3475 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3476 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
3477 | } |
3478 | ||
ce97fa81 | 3479 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 3480 | template<int size> |
21bb3914 | 3481 | inline bool |
4aebb631 RC |
3482 | Target_x86_64<size>::Scan::possible_function_pointer_reloc( |
3483 | Sized_relobj_file<size, false>* src_obj, | |
3484 | unsigned int src_indx, | |
3485 | unsigned int r_offset, | |
3486 | unsigned int r_type) | |
21bb3914 | 3487 | { |
21bb3914 ST |
3488 | switch (r_type) |
3489 | { | |
3490 | case elfcpp::R_X86_64_64: | |
3491 | case elfcpp::R_X86_64_32: | |
3492 | case elfcpp::R_X86_64_32S: | |
3493 | case elfcpp::R_X86_64_16: | |
3494 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
3495 | case elfcpp::R_X86_64_GOT64: |
3496 | case elfcpp::R_X86_64_GOT32: | |
3497 | case elfcpp::R_X86_64_GOTPCREL64: | |
3498 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3499 | case elfcpp::R_X86_64_GOTPCRELX: |
3500 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ce97fa81 | 3501 | case elfcpp::R_X86_64_GOTPLT64: |
21bb3914 | 3502 | { |
2e702c99 | 3503 | return true; |
21bb3914 | 3504 | } |
4aebb631 RC |
3505 | case elfcpp::R_X86_64_PC32: |
3506 | { | |
3507 | // This relocation may be used both for function calls and | |
3508 | // for taking address of a function. We distinguish between | |
3509 | // them by checking the opcodes. | |
3510 | uint64_t sh_flags = src_obj->section_flags(src_indx); | |
3511 | bool is_executable = (sh_flags & elfcpp::SHF_EXECINSTR) != 0; | |
3512 | if (is_executable) | |
3513 | { | |
3514 | section_size_type stype; | |
3515 | const unsigned char* view = src_obj->section_contents(src_indx, | |
3516 | &stype, | |
3517 | true); | |
3518 | ||
3519 | // call | |
3520 | if (r_offset >= 1 | |
3521 | && view[r_offset - 1] == 0xe8) | |
3522 | return false; | |
3523 | ||
3524 | // jmp | |
3525 | if (r_offset >= 1 | |
3526 | && view[r_offset - 1] == 0xe9) | |
3527 | return false; | |
3528 | ||
3529 | // jo/jno/jb/jnb/je/jne/jna/ja/js/jns/jp/jnp/jl/jge/jle/jg | |
3530 | if (r_offset >= 2 | |
3531 | && view[r_offset - 2] == 0x0f | |
3532 | && view[r_offset - 1] >= 0x80 | |
3533 | && view[r_offset - 1] <= 0x8f) | |
3534 | return false; | |
3535 | } | |
3536 | ||
3537 | // Be conservative and treat all others as function pointers. | |
3538 | return true; | |
3539 | } | |
21bb3914 ST |
3540 | } |
3541 | return false; | |
3542 | } | |
3543 | ||
3544 | // For safe ICF, scan a relocation for a local symbol to check if it | |
3545 | // corresponds to a function pointer being taken. In that case mark | |
3546 | // the function whose pointer was taken as not foldable. | |
3547 | ||
fc51264f | 3548 | template<int size> |
21bb3914 | 3549 | inline bool |
fc51264f | 3550 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
3551 | Symbol_table* , |
3552 | Layout* , | |
fc51264f | 3553 | Target_x86_64<size>* , |
4aebb631 RC |
3554 | Sized_relobj_file<size, false>* src_obj, |
3555 | unsigned int src_indx, | |
21bb3914 | 3556 | Output_section* , |
4aebb631 | 3557 | const elfcpp::Rela<size, false>& reloc, |
21bb3914 | 3558 | unsigned int r_type, |
fc51264f | 3559 | const elfcpp::Sym<size, false>&) |
21bb3914 | 3560 | { |
4aebb631 RC |
3561 | return possible_function_pointer_reloc(src_obj, src_indx, |
3562 | reloc.get_r_offset(), r_type); | |
21bb3914 ST |
3563 | } |
3564 | ||
3565 | // For safe ICF, scan a relocation for a global symbol to check if it | |
3566 | // corresponds to a function pointer being taken. In that case mark | |
3567 | // the function whose pointer was taken as not foldable. | |
3568 | ||
fc51264f | 3569 | template<int size> |
21bb3914 | 3570 | inline bool |
fc51264f | 3571 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
3572 | Symbol_table*, |
3573 | Layout* , | |
fc51264f | 3574 | Target_x86_64<size>* , |
4aebb631 RC |
3575 | Sized_relobj_file<size, false>* src_obj, |
3576 | unsigned int src_indx, | |
21bb3914 | 3577 | Output_section* , |
4aebb631 | 3578 | const elfcpp::Rela<size, false>& reloc, |
21bb3914 | 3579 | unsigned int r_type, |
aac1d94f | 3580 | Symbol*) |
21bb3914 | 3581 | { |
4aebb631 RC |
3582 | return possible_function_pointer_reloc(src_obj, src_indx, |
3583 | reloc.get_r_offset(), r_type); | |
21bb3914 ST |
3584 | } |
3585 | ||
2e30d253 ILT |
3586 | // Scan a relocation for a global symbol. |
3587 | ||
fc51264f | 3588 | template<int size> |
2e30d253 | 3589 | inline void |
fc51264f | 3590 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
3591 | Layout* layout, |
3592 | Target_x86_64<size>* target, | |
3593 | Sized_relobj_file<size, false>* object, | |
3594 | unsigned int data_shndx, | |
3595 | Output_section* output_section, | |
3596 | const elfcpp::Rela<size, false>& reloc, | |
3597 | unsigned int r_type, | |
3598 | Symbol* gsym) | |
2e30d253 | 3599 | { |
7223e9ca ILT |
3600 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
3601 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
3602 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
3603 | target->make_plt_entry(symtab, layout, gsym); | |
3604 | ||
2e30d253 ILT |
3605 | switch (r_type) |
3606 | { | |
3607 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3608 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3609 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3610 | break; |
3611 | ||
3612 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
3613 | case elfcpp::R_X86_64_32: |
3614 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 3615 | case elfcpp::R_X86_64_16: |
2e30d253 | 3616 | case elfcpp::R_X86_64_8: |
96f2030e | 3617 | { |
2e702c99 RM |
3618 | // Make a PLT entry if necessary. |
3619 | if (gsym->needs_plt_entry()) | |
3620 | { | |
3621 | target->make_plt_entry(symtab, layout, gsym); | |
3622 | // Since this is not a PC-relative relocation, we may be | |
3623 | // taking the address of a function. In that case we need to | |
3624 | // set the entry in the dynamic symbol table to the address of | |
3625 | // the PLT entry. | |
3626 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
3627 | gsym->set_needs_dynsym_value(); | |
3628 | } | |
3629 | // Make a dynamic relocation if necessary. | |
3630 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
3631 | { | |
a82bef93 ST |
3632 | if (!parameters->options().output_is_position_independent() |
3633 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
3634 | { |
3635 | target->copy_reloc(symtab, layout, object, | |
3636 | data_shndx, output_section, gsym, reloc); | |
3637 | } | |
1bae613c L |
3638 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
3639 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
7223e9ca ILT |
3640 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
3641 | && gsym->can_use_relative_reloc(false) | |
3642 | && !gsym->is_from_dynobj() | |
3643 | && !gsym->is_undefined() | |
3644 | && !gsym->is_preemptible()) | |
3645 | { | |
3646 | // Use an IRELATIVE reloc for a locally defined | |
3647 | // STT_GNU_IFUNC symbol. This makes a function | |
3648 | // address in a PIE executable match the address in a | |
3649 | // shared library that it links against. | |
67181c72 ILT |
3650 | Reloc_section* rela_dyn = |
3651 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
3652 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
3653 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
3654 | output_section, object, | |
3655 | data_shndx, | |
3656 | reloc.get_r_offset(), | |
3657 | reloc.get_r_addend()); | |
3658 | } | |
b14016f0 L |
3659 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
3660 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
2e702c99 RM |
3661 | && gsym->can_use_relative_reloc(false)) |
3662 | { | |
3663 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
3664 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
3665 | output_section, object, | |
3666 | data_shndx, | |
3667 | reloc.get_r_offset(), | |
13cf9988 | 3668 | reloc.get_r_addend(), false); |
2e702c99 RM |
3669 | } |
3670 | else | |
3671 | { | |
3672 | this->check_non_pic(object, r_type, gsym); | |
3673 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
3674 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
3675 | data_shndx, reloc.get_r_offset(), | |
3676 | reloc.get_r_addend()); | |
3677 | } | |
3678 | } | |
d61c6bd4 ILT |
3679 | } |
3680 | break; | |
3681 | ||
3682 | case elfcpp::R_X86_64_PC64: | |
3683 | case elfcpp::R_X86_64_PC32: | |
3684 | case elfcpp::R_X86_64_PC16: | |
3685 | case elfcpp::R_X86_64_PC8: | |
3686 | { | |
2e702c99 RM |
3687 | // Make a PLT entry if necessary. |
3688 | if (gsym->needs_plt_entry()) | |
3689 | target->make_plt_entry(symtab, layout, gsym); | |
3690 | // Make a dynamic relocation if necessary. | |
3691 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
3692 | { | |
a82bef93 ST |
3693 | if (parameters->options().output_is_executable() |
3694 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
3695 | { |
3696 | target->copy_reloc(symtab, layout, object, | |
3697 | data_shndx, output_section, gsym, reloc); | |
3698 | } | |
3699 | else | |
3700 | { | |
3701 | this->check_non_pic(object, r_type, gsym); | |
3702 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
3703 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
3704 | data_shndx, reloc.get_r_offset(), | |
3705 | reloc.get_r_addend()); | |
3706 | } | |
3707 | } | |
d61c6bd4 | 3708 | } |
2e30d253 ILT |
3709 | break; |
3710 | ||
ff006520 | 3711 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 3712 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
3713 | case elfcpp::R_X86_64_GOTPCREL64: |
3714 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3715 | case elfcpp::R_X86_64_GOTPCRELX: |
3716 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ff006520 | 3717 | case elfcpp::R_X86_64_GOTPLT64: |
2e30d253 | 3718 | { |
2e702c99 RM |
3719 | // The symbol requires a GOT entry. |
3720 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1fa29f10 IT |
3721 | |
3722 | // If we convert this from | |
3723 | // mov foo@GOTPCREL(%rip), %reg | |
3724 | // to lea foo(%rip), %reg. | |
3a4f096e ST |
3725 | // OR |
3726 | // if we convert | |
3727 | // (callq|jmpq) *foo@GOTPCRELX(%rip) to | |
3728 | // (callq|jmpq) foo | |
1fa29f10 | 3729 | // in Relocate::relocate, then there is nothing to do here. |
158600eb CC |
3730 | // We cannot make these optimizations in incremental linking mode, |
3731 | // because we look at the opcode to decide whether or not to make | |
3732 | // change, and during an incremental update, the change may have | |
3733 | // already been applied. | |
3a4f096e ST |
3734 | |
3735 | Lazy_view<size> view(object, data_shndx); | |
3736 | size_t r_offset = reloc.get_r_offset(); | |
158600eb | 3737 | if (!parameters->incremental() |
568cbddc | 3738 | && reloc.get_r_addend() == -4 |
158600eb | 3739 | && r_offset >= 2 |
3a4f096e ST |
3740 | && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type, |
3741 | r_offset, &view)) | |
3742 | break; | |
3743 | ||
158600eb CC |
3744 | if (!parameters->incremental() |
3745 | && r_offset >= 2 | |
3a4f096e ST |
3746 | && Target_x86_64<size>::can_convert_callq_to_direct(gsym, r_type, |
3747 | r_offset, | |
3748 | &view)) | |
3749 | break; | |
1fa29f10 | 3750 | |
2e702c99 | 3751 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
3752 | { |
3753 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
3754 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
3755 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
3756 | else | |
3757 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
3758 | } | |
2e702c99 RM |
3759 | else |
3760 | { | |
3761 | // If this symbol is not fully resolved, we need to add a | |
3762 | // dynamic relocation for it. | |
3763 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
07aa62f2 ILT |
3764 | |
3765 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
3766 | // | |
3767 | // 1) The symbol may be defined in some other module. | |
3768 | // | |
3769 | // 2) We are building a shared library and this is a | |
3770 | // protected symbol; using GLOB_DAT means that the dynamic | |
3771 | // linker can use the address of the PLT in the main | |
3772 | // executable when appropriate so that function address | |
3773 | // comparisons work. | |
3774 | // | |
3775 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
3776 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
3777 | if (gsym->is_from_dynobj() |
3778 | || gsym->is_undefined() | |
3779 | || gsym->is_preemptible() | |
07aa62f2 ILT |
3780 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
3781 | && parameters->options().shared()) | |
7223e9ca ILT |
3782 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
3783 | && parameters->options().output_is_position_independent())) | |
2e702c99 | 3784 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
83896202 | 3785 | elfcpp::R_X86_64_GLOB_DAT); |
2e702c99 RM |
3786 | else |
3787 | { | |
7223e9ca ILT |
3788 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
3789 | // offset into the GOT, so that function pointer | |
3790 | // comparisons work correctly. | |
3791 | bool is_new; | |
3792 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
3793 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
3794 | else | |
3795 | { | |
3796 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
3797 | // Tell the dynamic linker to use the PLT address | |
3798 | // when resolving relocations. | |
3799 | if (gsym->is_from_dynobj() | |
3800 | && !parameters->options().shared()) | |
3801 | gsym->set_needs_dynsym_value(); | |
3802 | } | |
2e702c99 | 3803 | if (is_new) |
7223e9ca ILT |
3804 | { |
3805 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
3806 | rela_dyn->add_global_relative(gsym, | |
3807 | elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 3808 | got, got_off, 0, false); |
7223e9ca | 3809 | } |
2e702c99 RM |
3810 | } |
3811 | } | |
2e30d253 ILT |
3812 | } |
3813 | break; | |
3814 | ||
3815 | case elfcpp::R_X86_64_PLT32: | |
3816 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
3817 | // Otherwise we need a PLT entry. | |
3818 | if (gsym->final_value_is_known()) | |
3819 | break; | |
96f2030e ILT |
3820 | // If building a shared library, we can also skip the PLT entry |
3821 | // if the symbol is defined in the output file and is protected | |
3822 | // or hidden. | |
3823 | if (gsym->is_defined() | |
2e702c99 RM |
3824 | && !gsym->is_from_dynobj() |
3825 | && !gsym->is_preemptible()) | |
96f2030e | 3826 | break; |
2e30d253 ILT |
3827 | target->make_plt_entry(symtab, layout, gsym); |
3828 | break; | |
3829 | ||
fdc2f80f | 3830 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 3831 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
3832 | case elfcpp::R_X86_64_GOTPC64: |
3833 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
3834 | // We need a GOT section. |
3835 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
3836 | // For PLTOFF64, we also need a PLT entry (but only if the |
3837 | // symbol is not fully resolved). | |
3838 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
3839 | && !gsym->final_value_is_known()) | |
3840 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
3841 | break; |
3842 | ||
2e30d253 ILT |
3843 | case elfcpp::R_X86_64_COPY: |
3844 | case elfcpp::R_X86_64_GLOB_DAT: | |
3845 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3846 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3847 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3848 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 3849 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3850 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 3851 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3852 | gold_error(_("%s: unexpected reloc %u in object file"), |
3853 | object->name().c_str(), r_type); | |
2e30d253 | 3854 | break; |
2e30d253 | 3855 | |
d61c17ea | 3856 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
3857 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3858 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3859 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3860 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3861 | case elfcpp::R_X86_64_DTPOFF32: |
3862 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3863 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3864 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 3865 | { |
65d92137 CC |
3866 | // For the Initial-Exec model, we can treat undef symbols as final |
3867 | // when building an executable. | |
3868 | const bool is_final = (gsym->final_value_is_known() || | |
3869 | (r_type == elfcpp::R_X86_64_GOTTPOFF && | |
3870 | gsym->is_undefined() && | |
3871 | parameters->options().output_is_executable())); | |
e041f13d | 3872 | const tls::Tls_optimization optimized_type |
2e702c99 | 3873 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3874 | switch (r_type) |
3875 | { | |
2e702c99 | 3876 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
3877 | if (optimized_type == tls::TLSOPT_NONE) |
3878 | { | |
2e702c99 RM |
3879 | // Create a pair of GOT entries for the module index and |
3880 | // dtv-relative offset. | |
3881 | Output_data_got<64, false>* got | |
3882 | = target->got_section(symtab, layout); | |
3883 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
83896202 ILT |
3884 | target->rela_dyn_section(layout), |
3885 | elfcpp::R_X86_64_DTPMOD64, | |
3886 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
3887 | } |
3888 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3889 | { | |
2e702c99 RM |
3890 | // Create a GOT entry for the tp-relative offset. |
3891 | Output_data_got<64, false>* got | |
3892 | = target->got_section(symtab, layout); | |
3893 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3894 | target->rela_dyn_section(layout), |
3895 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
3896 | } |
3897 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3898 | unsupported_reloc_global(object, r_type, gsym); | |
3899 | break; | |
3900 | ||
2e702c99 RM |
3901 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
3902 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
3903 | if (optimized_type == tls::TLSOPT_NONE) |
3904 | { | |
2e702c99 RM |
3905 | // Create reserved PLT and GOT entries for the resolver. |
3906 | target->reserve_tlsdesc_entries(symtab, layout); | |
3907 | ||
3908 | // Create a double GOT entry with an R_X86_64_TLSDESC | |
3909 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
3910 | // lazily, so the GOT entry needs to be in an area in | |
3911 | // .got.plt, not .got. Call got_section to make sure | |
3912 | // the section has been created. | |
a8df5856 | 3913 | target->got_section(symtab, layout); |
2e702c99 | 3914 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
ca09d69a | 3915 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
2e702c99 | 3916 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
83896202 | 3917 | elfcpp::R_X86_64_TLSDESC, 0); |
c2b45e22 CC |
3918 | } |
3919 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3920 | { | |
2e702c99 RM |
3921 | // Create a GOT entry for the tp-relative offset. |
3922 | Output_data_got<64, false>* got | |
3923 | = target->got_section(symtab, layout); | |
3924 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3925 | target->rela_dyn_section(layout), |
3926 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
3927 | } |
3928 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3929 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
3930 | break; |
3931 | ||
2e702c99 | 3932 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3933 | break; |
3934 | ||
2e702c99 | 3935 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3936 | if (optimized_type == tls::TLSOPT_NONE) |
3937 | { | |
2e702c99 RM |
3938 | // Create a GOT entry for the module index. |
3939 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3940 | } |
3941 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3942 | unsupported_reloc_global(object, r_type, gsym); | |
3943 | break; | |
3944 | ||
2e702c99 RM |
3945 | case elfcpp::R_X86_64_DTPOFF32: |
3946 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3947 | break; |
3948 | ||
2e702c99 | 3949 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3950 | layout->set_has_static_tls(); |
2e702c99 RM |
3951 | if (optimized_type == tls::TLSOPT_NONE) |
3952 | { | |
3953 | // Create a GOT entry for the tp-relative offset. | |
3954 | Output_data_got<64, false>* got | |
3955 | = target->got_section(symtab, layout); | |
3956 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3957 | target->rela_dyn_section(layout), |
3958 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3959 | } |
3960 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3961 | unsupported_reloc_global(object, r_type, gsym); | |
3962 | break; | |
0ffd9845 | 3963 | |
2e702c99 | 3964 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3965 | layout->set_has_static_tls(); |
2e702c99 | 3966 | if (parameters->options().shared()) |
b1759dce | 3967 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 | 3968 | break; |
e041f13d | 3969 | |
2e702c99 RM |
3970 | default: |
3971 | gold_unreachable(); | |
2e30d253 ILT |
3972 | } |
3973 | } | |
3974 | break; | |
fdc2f80f ILT |
3975 | |
3976 | case elfcpp::R_X86_64_SIZE32: | |
3977 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3978 | default: |
75f2446e | 3979 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3980 | object->name().c_str(), r_type, |
2e702c99 | 3981 | gsym->demangled_name().c_str()); |
2e30d253 ILT |
3982 | break; |
3983 | } | |
3984 | } | |
3985 | ||
fc51264f | 3986 | template<int size> |
6d03d481 | 3987 | void |
fc51264f L |
3988 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
3989 | Layout* layout, | |
3990 | Sized_relobj_file<size, false>* object, | |
3991 | unsigned int data_shndx, | |
3992 | unsigned int sh_type, | |
3993 | const unsigned char* prelocs, | |
3994 | size_t reloc_count, | |
3995 | Output_section* output_section, | |
3996 | bool needs_special_offset_handling, | |
3997 | size_t local_symbol_count, | |
3998 | const unsigned char* plocal_symbols) | |
6d03d481 | 3999 | { |
4d625b70 CC |
4000 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
4001 | Classify_reloc; | |
6d03d481 ST |
4002 | |
4003 | if (sh_type == elfcpp::SHT_REL) | |
4004 | { | |
4005 | return; | |
4006 | } | |
4007 | ||
4d625b70 CC |
4008 | gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan, |
4009 | Classify_reloc>( | |
6d03d481 ST |
4010 | symtab, |
4011 | layout, | |
4012 | this, | |
4013 | object, | |
4014 | data_shndx, | |
4015 | prelocs, | |
4016 | reloc_count, | |
4017 | output_section, | |
4018 | needs_special_offset_handling, | |
4019 | local_symbol_count, | |
4020 | plocal_symbols); | |
2e702c99 | 4021 | |
6d03d481 | 4022 | } |
2e30d253 ILT |
4023 | // Scan relocations for a section. |
4024 | ||
fc51264f | 4025 | template<int size> |
2e30d253 | 4026 | void |
fc51264f L |
4027 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
4028 | Layout* layout, | |
4029 | Sized_relobj_file<size, false>* object, | |
4030 | unsigned int data_shndx, | |
4031 | unsigned int sh_type, | |
4032 | const unsigned char* prelocs, | |
4033 | size_t reloc_count, | |
4034 | Output_section* output_section, | |
4035 | bool needs_special_offset_handling, | |
4036 | size_t local_symbol_count, | |
4037 | const unsigned char* plocal_symbols) | |
2e30d253 | 4038 | { |
4d625b70 CC |
4039 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
4040 | Classify_reloc; | |
4041 | ||
2e30d253 ILT |
4042 | if (sh_type == elfcpp::SHT_REL) |
4043 | { | |
75f2446e ILT |
4044 | gold_error(_("%s: unsupported REL reloc section"), |
4045 | object->name().c_str()); | |
4046 | return; | |
2e30d253 ILT |
4047 | } |
4048 | ||
4d625b70 | 4049 | gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>( |
2e30d253 ILT |
4050 | symtab, |
4051 | layout, | |
4052 | this, | |
4053 | object, | |
4054 | data_shndx, | |
4055 | prelocs, | |
4056 | reloc_count, | |
730cdc88 ILT |
4057 | output_section, |
4058 | needs_special_offset_handling, | |
2e30d253 | 4059 | local_symbol_count, |
730cdc88 | 4060 | plocal_symbols); |
2e30d253 ILT |
4061 | } |
4062 | ||
4063 | // Finalize the sections. | |
4064 | ||
fc51264f | 4065 | template<int size> |
2e30d253 | 4066 | void |
fc51264f | 4067 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
4068 | Layout* layout, |
4069 | const Input_objects*, | |
e785ec03 | 4070 | Symbol_table* symtab) |
2e30d253 | 4071 | { |
ea715a34 ILT |
4072 | const Reloc_section* rel_plt = (this->plt_ == NULL |
4073 | ? NULL | |
e291e7b9 | 4074 | : this->plt_->rela_plt()); |
ea715a34 | 4075 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
bdad2ad5 | 4076 | this->rela_dyn_, true, false, false); |
2e702c99 | 4077 | |
2e30d253 ILT |
4078 | // Fill in some more dynamic tags. |
4079 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
4080 | if (odyn != NULL) | |
4081 | { | |
22b127cc | 4082 | if (this->plt_ != NULL |
ea715a34 ILT |
4083 | && this->plt_->output_section() != NULL |
4084 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 4085 | { |
ea715a34 ILT |
4086 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
4087 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
4088 | this->got_->finalize_data_size(); | |
4089 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
4090 | this->plt_, plt_offset); | |
4091 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
4092 | this->got_, got_offset); | |
2e30d253 ILT |
4093 | } |
4094 | } | |
4095 | ||
4096 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
4097 | // relocs. | |
12c0daef ILT |
4098 | if (this->copy_relocs_.any_saved_relocs()) |
4099 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
4100 | |
4101 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
4102 | // the .got.plt section. | |
4103 | Symbol* sym = this->global_offset_table_; | |
4104 | if (sym != NULL) | |
4105 | { | |
4106 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 4107 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 4108 | } |
28a13fec | 4109 | |
67181c72 ILT |
4110 | if (parameters->doing_static_link() |
4111 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
4112 | { |
4113 | // If linking statically, make sure that the __rela_iplt symbols | |
4114 | // were defined if necessary, even if we didn't create a PLT. | |
4115 | static const Define_symbol_in_segment syms[] = | |
4116 | { | |
4117 | { | |
4118 | "__rela_iplt_start", // name | |
4119 | elfcpp::PT_LOAD, // segment_type | |
4120 | elfcpp::PF_W, // segment_flags_set | |
4121 | elfcpp::PF(0), // segment_flags_clear | |
4122 | 0, // value | |
4123 | 0, // size | |
4124 | elfcpp::STT_NOTYPE, // type | |
4125 | elfcpp::STB_GLOBAL, // binding | |
4126 | elfcpp::STV_HIDDEN, // visibility | |
4127 | 0, // nonvis | |
4128 | Symbol::SEGMENT_START, // offset_from_base | |
4129 | true // only_if_ref | |
4130 | }, | |
4131 | { | |
4132 | "__rela_iplt_end", // name | |
4133 | elfcpp::PT_LOAD, // segment_type | |
4134 | elfcpp::PF_W, // segment_flags_set | |
4135 | elfcpp::PF(0), // segment_flags_clear | |
4136 | 0, // value | |
4137 | 0, // size | |
4138 | elfcpp::STT_NOTYPE, // type | |
4139 | elfcpp::STB_GLOBAL, // binding | |
4140 | elfcpp::STV_HIDDEN, // visibility | |
4141 | 0, // nonvis | |
4142 | Symbol::SEGMENT_START, // offset_from_base | |
4143 | true // only_if_ref | |
4144 | } | |
4145 | }; | |
4146 | ||
4147 | symtab->define_symbols(layout, 2, syms, | |
4148 | layout->script_options()->saw_sections_clause()); | |
4149 | } | |
2e30d253 ILT |
4150 | } |
4151 | ||
19ef3f4d CC |
4152 | // For x32, we need to handle PC-relative relocations using full 64-bit |
4153 | // arithmetic, so that we can detect relocation overflows properly. | |
4154 | // This class overrides the pcrela32_check methods from the defaults in | |
4155 | // Relocate_functions in reloc.h. | |
4156 | ||
4157 | template<int size> | |
4158 | class X86_64_relocate_functions : public Relocate_functions<size, false> | |
4159 | { | |
4160 | public: | |
4161 | typedef Relocate_functions<size, false> Base; | |
4162 | ||
4163 | // Do a simple PC relative relocation with the addend in the | |
4164 | // relocation. | |
4165 | static inline typename Base::Reloc_status | |
4166 | pcrela32_check(unsigned char* view, | |
4167 | typename elfcpp::Elf_types<64>::Elf_Addr value, | |
4168 | typename elfcpp::Elf_types<64>::Elf_Swxword addend, | |
4169 | typename elfcpp::Elf_types<64>::Elf_Addr address) | |
4170 | { | |
4171 | typedef typename elfcpp::Swap<32, false>::Valtype Valtype; | |
4172 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
4173 | value = value + addend - address; | |
4174 | elfcpp::Swap<32, false>::writeval(wv, value); | |
4175 | return (Bits<32>::has_overflow(value) | |
4176 | ? Base::RELOC_OVERFLOW : Base::RELOC_OK); | |
4177 | } | |
4178 | ||
4179 | // Do a simple PC relative relocation with a Symbol_value with the | |
4180 | // addend in the relocation. | |
4181 | static inline typename Base::Reloc_status | |
4182 | pcrela32_check(unsigned char* view, | |
4183 | const Sized_relobj_file<size, false>* object, | |
4184 | const Symbol_value<size>* psymval, | |
4185 | typename elfcpp::Elf_types<64>::Elf_Swxword addend, | |
4186 | typename elfcpp::Elf_types<64>::Elf_Addr address) | |
4187 | { | |
4188 | typedef typename elfcpp::Swap<32, false>::Valtype Valtype; | |
4189 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
7c8b700c CC |
4190 | typename elfcpp::Elf_types<64>::Elf_Addr value; |
4191 | if (addend >= 0) | |
4192 | value = psymval->value(object, addend); | |
4193 | else | |
4194 | { | |
4195 | // For negative addends, get the symbol value without | |
4196 | // the addend, then add the addend using 64-bit arithmetic. | |
4197 | value = psymval->value(object, 0); | |
4198 | value += addend; | |
4199 | } | |
4200 | value -= address; | |
19ef3f4d CC |
4201 | elfcpp::Swap<32, false>::writeval(wv, value); |
4202 | return (Bits<32>::has_overflow(value) | |
4203 | ? Base::RELOC_OVERFLOW : Base::RELOC_OK); | |
4204 | } | |
4205 | }; | |
4206 | ||
2e30d253 ILT |
4207 | // Perform a relocation. |
4208 | ||
fc51264f | 4209 | template<int size> |
2e30d253 | 4210 | inline bool |
fc51264f L |
4211 | Target_x86_64<size>::Relocate::relocate( |
4212 | const Relocate_info<size, false>* relinfo, | |
91a65d2f | 4213 | unsigned int, |
fc51264f L |
4214 | Target_x86_64<size>* target, |
4215 | Output_section*, | |
4216 | size_t relnum, | |
91a65d2f | 4217 | const unsigned char* preloc, |
fc51264f L |
4218 | const Sized_symbol<size>* gsym, |
4219 | const Symbol_value<size>* psymval, | |
4220 | unsigned char* view, | |
4221 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
4222 | section_size_type view_size) | |
2e30d253 | 4223 | { |
19ef3f4d | 4224 | typedef X86_64_relocate_functions<size> Reloc_funcs; |
91a65d2f AM |
4225 | const elfcpp::Rela<size, false> rela(preloc); |
4226 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); | |
4227 | ||
2e30d253 ILT |
4228 | if (this->skip_call_tls_get_addr_) |
4229 | { | |
5efc7cd2 | 4230 | if ((r_type != elfcpp::R_X86_64_PLT32 |
f5713901 | 4231 | && r_type != elfcpp::R_X86_64_GOTPCREL |
ad961eab | 4232 | && r_type != elfcpp::R_X86_64_GOTPCRELX |
2e702c99 | 4233 | && r_type != elfcpp::R_X86_64_PC32) |
2e30d253 | 4234 | || gsym == NULL |
0ffd9845 | 4235 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 4236 | { |
75f2446e ILT |
4237 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4238 | _("missing expected TLS relocation")); | |
f5713901 | 4239 | this->skip_call_tls_get_addr_ = false; |
75f2446e ILT |
4240 | } |
4241 | else | |
4242 | { | |
4243 | this->skip_call_tls_get_addr_ = false; | |
4244 | return false; | |
2e30d253 | 4245 | } |
2e30d253 ILT |
4246 | } |
4247 | ||
0e804863 ILT |
4248 | if (view == NULL) |
4249 | return true; | |
4250 | ||
fc51264f | 4251 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
4252 | |
4253 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 4254 | Symbol_value<size> symval; |
96f2030e | 4255 | if (gsym != NULL |
95a2c8d6 | 4256 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 4257 | { |
19fec8c1 | 4258 | symval.set_output_value(target->plt_address_for_global(gsym)); |
2e30d253 ILT |
4259 | psymval = &symval; |
4260 | } | |
7223e9ca ILT |
4261 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
4262 | { | |
fc51264f | 4263 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
4264 | if (object->local_has_plt_offset(r_sym)) |
4265 | { | |
19fec8c1 | 4266 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
4267 | psymval = &symval; |
4268 | } | |
4269 | } | |
2e30d253 | 4270 | |
0ffd9845 ILT |
4271 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
4272 | ||
4273 | // Get the GOT offset if needed. | |
96f2030e ILT |
4274 | // The GOT pointer points to the end of the GOT section. |
4275 | // We need to subtract the size of the GOT section to get | |
4276 | // the actual offset to use in the relocation. | |
0ffd9845 | 4277 | bool have_got_offset = false; |
c23dd342 L |
4278 | // Since the actual offset is always negative, we use signed int to |
4279 | // support 64-bit GOT relocations. | |
4280 | int got_offset = 0; | |
0ffd9845 ILT |
4281 | switch (r_type) |
4282 | { | |
4283 | case elfcpp::R_X86_64_GOT32: | |
4284 | case elfcpp::R_X86_64_GOT64: | |
4285 | case elfcpp::R_X86_64_GOTPLT64: | |
0ffd9845 ILT |
4286 | case elfcpp::R_X86_64_GOTPCREL64: |
4287 | if (gsym != NULL) | |
2e702c99 RM |
4288 | { |
4289 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
4290 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
4291 | } | |
0ffd9845 | 4292 | else |
2e702c99 RM |
4293 | { |
4294 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4295 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
4296 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
4297 | - target->got_size()); | |
4298 | } | |
0ffd9845 ILT |
4299 | have_got_offset = true; |
4300 | break; | |
4301 | ||
4302 | default: | |
4303 | break; | |
4304 | } | |
2e30d253 | 4305 | |
c34c98ed CC |
4306 | typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK; |
4307 | ||
2e30d253 ILT |
4308 | switch (r_type) |
4309 | { | |
4310 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
4311 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
4312 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
4313 | break; |
4314 | ||
4315 | case elfcpp::R_X86_64_64: | |
c34c98ed | 4316 | Reloc_funcs::rela64(view, object, psymval, addend); |
2e30d253 ILT |
4317 | break; |
4318 | ||
4319 | case elfcpp::R_X86_64_PC64: | |
c34c98ed | 4320 | Reloc_funcs::pcrela64(view, object, psymval, addend, |
2e702c99 | 4321 | address); |
2e30d253 ILT |
4322 | break; |
4323 | ||
4324 | case elfcpp::R_X86_64_32: | |
c34c98ed CC |
4325 | rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend, |
4326 | Reloc_funcs::CHECK_UNSIGNED); | |
2e30d253 ILT |
4327 | break; |
4328 | ||
4329 | case elfcpp::R_X86_64_32S: | |
c34c98ed CC |
4330 | rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend, |
4331 | Reloc_funcs::CHECK_SIGNED); | |
2e30d253 ILT |
4332 | break; |
4333 | ||
4334 | case elfcpp::R_X86_64_PC32: | |
c34c98ed | 4335 | rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend, |
19ef3f4d | 4336 | address); |
2e30d253 ILT |
4337 | break; |
4338 | ||
4339 | case elfcpp::R_X86_64_16: | |
c34c98ed | 4340 | Reloc_funcs::rela16(view, object, psymval, addend); |
2e30d253 ILT |
4341 | break; |
4342 | ||
4343 | case elfcpp::R_X86_64_PC16: | |
c34c98ed | 4344 | Reloc_funcs::pcrela16(view, object, psymval, addend, address); |
2e30d253 ILT |
4345 | break; |
4346 | ||
4347 | case elfcpp::R_X86_64_8: | |
c34c98ed | 4348 | Reloc_funcs::rela8(view, object, psymval, addend); |
2e30d253 ILT |
4349 | break; |
4350 | ||
4351 | case elfcpp::R_X86_64_PC8: | |
c34c98ed | 4352 | Reloc_funcs::pcrela8(view, object, psymval, addend, address); |
2e30d253 ILT |
4353 | break; |
4354 | ||
4355 | case elfcpp::R_X86_64_PLT32: | |
f389a824 | 4356 | gold_assert(gsym == NULL |
2e702c99 | 4357 | || gsym->has_plt_offset() |
99f8faca ILT |
4358 | || gsym->final_value_is_known() |
4359 | || (gsym->is_defined() | |
4360 | && !gsym->is_from_dynobj() | |
4361 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
4362 | // Note: while this code looks the same as for R_X86_64_PC32, it |
4363 | // behaves differently because psymval was set to point to | |
4364 | // the PLT entry, rather than the symbol, in Scan::global(). | |
c34c98ed | 4365 | rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend, |
19ef3f4d | 4366 | address); |
2e30d253 ILT |
4367 | break; |
4368 | ||
ee9e9e86 ILT |
4369 | case elfcpp::R_X86_64_PLTOFF64: |
4370 | { | |
2e702c99 RM |
4371 | gold_assert(gsym); |
4372 | gold_assert(gsym->has_plt_offset() | |
4373 | || gsym->final_value_is_known()); | |
fc51264f | 4374 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
c23dd342 L |
4375 | // This is the address of GLOBAL_OFFSET_TABLE. |
4376 | got_address = target->got_plt_section()->address(); | |
c34c98ed | 4377 | Reloc_funcs::rela64(view, object, psymval, addend - got_address); |
ee9e9e86 | 4378 | } |
7849f6d8 | 4379 | break; |
ee9e9e86 | 4380 | |
2e30d253 | 4381 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 4382 | gold_assert(have_got_offset); |
c34c98ed | 4383 | Reloc_funcs::rela32(view, got_offset, addend); |
2e30d253 ILT |
4384 | break; |
4385 | ||
e822f2b1 ILT |
4386 | case elfcpp::R_X86_64_GOTPC32: |
4387 | { | |
2e702c99 | 4388 | gold_assert(gsym); |
fc51264f | 4389 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 4390 | value = target->got_plt_section()->address(); |
19ef3f4d | 4391 | Reloc_funcs::pcrela32_check(view, value, addend, address); |
e822f2b1 ILT |
4392 | } |
4393 | break; | |
4394 | ||
4395 | case elfcpp::R_X86_64_GOT64: | |
fdc2f80f | 4396 | case elfcpp::R_X86_64_GOTPLT64: |
de194d85 | 4397 | // R_X86_64_GOTPLT64 is obsolete and treated the same as |
e88ba8d5 | 4398 | // GOT64. |
0ffd9845 | 4399 | gold_assert(have_got_offset); |
c34c98ed | 4400 | Reloc_funcs::rela64(view, got_offset, addend); |
e822f2b1 ILT |
4401 | break; |
4402 | ||
4403 | case elfcpp::R_X86_64_GOTPC64: | |
4404 | { | |
2e702c99 | 4405 | gold_assert(gsym); |
fc51264f | 4406 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 4407 | value = target->got_plt_section()->address(); |
c34c98ed | 4408 | Reloc_funcs::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
4409 | } |
4410 | break; | |
4411 | ||
2e30d253 ILT |
4412 | case elfcpp::R_X86_64_GOTOFF64: |
4413 | { | |
ea8e302e AM |
4414 | typename elfcpp::Elf_types<size>::Elf_Addr reladdr; |
4415 | reladdr = target->got_plt_section()->address(); | |
4416 | Reloc_funcs::pcrela64(view, object, psymval, addend, reladdr); | |
2e30d253 ILT |
4417 | } |
4418 | break; | |
4419 | ||
4420 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
4421 | case elfcpp::R_X86_64_GOTPCRELX: |
4422 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
2e30d253 | 4423 | { |
568cbddc L |
4424 | bool converted_p = false; |
4425 | ||
4426 | if (rela.get_r_addend() == -4) | |
3a4f096e | 4427 | { |
568cbddc L |
4428 | // Convert |
4429 | // mov foo@GOTPCREL(%rip), %reg | |
4430 | // to lea foo(%rip), %reg. | |
4431 | // if possible. | |
4432 | if (!parameters->incremental() | |
4433 | && ((gsym == NULL | |
4434 | && rela.get_r_offset() >= 2 | |
4435 | && view[-2] == 0x8b | |
4436 | && !psymval->is_ifunc_symbol()) | |
4437 | || (gsym != NULL | |
4438 | && rela.get_r_offset() >= 2 | |
4439 | && Target_x86_64<size>::can_convert_mov_to_lea(gsym, | |
4440 | r_type, | |
4441 | 0, | |
4442 | &view)))) | |
3a4f096e | 4443 | { |
568cbddc | 4444 | view[-2] = 0x8d; |
3a4f096e | 4445 | Reloc_funcs::pcrela32(view, object, psymval, addend, address); |
568cbddc | 4446 | converted_p = true; |
3a4f096e | 4447 | } |
568cbddc L |
4448 | // Convert |
4449 | // callq *foo@GOTPCRELX(%rip) to | |
4450 | // addr32 callq foo | |
4451 | // and jmpq *foo@GOTPCRELX(%rip) to | |
4452 | // jmpq foo | |
4453 | // nop | |
4454 | else if (!parameters->incremental() | |
4455 | && gsym != NULL | |
4456 | && rela.get_r_offset() >= 2 | |
4457 | && Target_x86_64<size>::can_convert_callq_to_direct(gsym, | |
4458 | r_type, | |
4459 | 0, | |
4460 | &view)) | |
3a4f096e | 4461 | { |
568cbddc L |
4462 | if (view[-1] == 0x15) |
4463 | { | |
4464 | // Convert callq *foo@GOTPCRELX(%rip) to addr32 callq. | |
4465 | // Opcode of addr32 is 0x67 and opcode of direct callq | |
4466 | // is 0xe8. | |
4467 | view[-2] = 0x67; | |
4468 | view[-1] = 0xe8; | |
4469 | // Convert GOTPCRELX to 32-bit pc relative reloc. | |
4470 | Reloc_funcs::pcrela32(view, object, psymval, addend, | |
4471 | address); | |
4472 | converted_p = true; | |
4473 | } | |
4474 | else | |
4475 | { | |
4476 | // Convert jmpq *foo@GOTPCRELX(%rip) to | |
4477 | // jmpq foo | |
4478 | // nop | |
4479 | // The opcode of direct jmpq is 0xe9. | |
4480 | view[-2] = 0xe9; | |
4481 | // The opcode of nop is 0x90. | |
4482 | view[3] = 0x90; | |
4483 | // Convert GOTPCRELX to 32-bit pc relative reloc. jmpq | |
4484 | // is rip relative and since the instruction following | |
4485 | // the jmpq is now the nop, offset the address by 1 | |
4486 | // byte. The start of the relocation also moves ahead | |
4487 | // by 1 byte. | |
4488 | Reloc_funcs::pcrela32(&view[-1], object, psymval, addend, | |
4489 | address - 1); | |
4490 | converted_p = true; | |
4491 | } | |
3a4f096e ST |
4492 | } |
4493 | } | |
568cbddc L |
4494 | |
4495 | if (!converted_p) | |
1fa29f10 IT |
4496 | { |
4497 | if (gsym != NULL) | |
4498 | { | |
4499 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
ed35cc4a CC |
4500 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) |
4501 | - target->got_size()); | |
1fa29f10 IT |
4502 | } |
4503 | else | |
4504 | { | |
4505 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
ed35cc4a CC |
4506 | gold_assert(object->local_has_got_offset(r_sym, |
4507 | GOT_TYPE_STANDARD)); | |
1fa29f10 IT |
4508 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) |
4509 | - target->got_size()); | |
4510 | } | |
4511 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
4512 | value = target->got_plt_section()->address() + got_offset; | |
19ef3f4d | 4513 | Reloc_funcs::pcrela32_check(view, value, addend, address); |
1fa29f10 | 4514 | } |
2e30d253 ILT |
4515 | } |
4516 | break; | |
4517 | ||
e822f2b1 ILT |
4518 | case elfcpp::R_X86_64_GOTPCREL64: |
4519 | { | |
2e702c99 RM |
4520 | gold_assert(have_got_offset); |
4521 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
4522 | value = target->got_plt_section()->address() + got_offset; | |
c34c98ed | 4523 | Reloc_funcs::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
4524 | } |
4525 | break; | |
4526 | ||
2e30d253 ILT |
4527 | case elfcpp::R_X86_64_COPY: |
4528 | case elfcpp::R_X86_64_GLOB_DAT: | |
4529 | case elfcpp::R_X86_64_JUMP_SLOT: | |
4530 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 4531 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 4532 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 4533 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 4534 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 4535 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
4536 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4537 | _("unexpected reloc %u in object file"), | |
4538 | r_type); | |
2e30d253 ILT |
4539 | break; |
4540 | ||
d61c17ea | 4541 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
4542 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
4543 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 4544 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 4545 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
4546 | case elfcpp::R_X86_64_DTPOFF32: |
4547 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
4548 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
4549 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 | 4550 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2e702c99 | 4551 | view, address, view_size); |
2e30d253 | 4552 | break; |
2e30d253 | 4553 | |
fdc2f80f ILT |
4554 | case elfcpp::R_X86_64_SIZE32: |
4555 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 4556 | default: |
75f2446e ILT |
4557 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4558 | _("unsupported reloc %u"), | |
4559 | r_type); | |
2e30d253 ILT |
4560 | break; |
4561 | } | |
4562 | ||
c34c98ed | 4563 | if (rstatus == Reloc_funcs::RELOC_OVERFLOW) |
17ecd016 CC |
4564 | { |
4565 | if (gsym == NULL) | |
4566 | { | |
4567 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4568 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
4569 | _("relocation overflow: " | |
4570 | "reference to local symbol %u in %s"), | |
4571 | r_sym, object->name().c_str()); | |
4572 | } | |
4573 | else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT) | |
4574 | { | |
4575 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
4576 | _("relocation overflow: " | |
4577 | "reference to '%s' defined in %s"), | |
4578 | gsym->name(), | |
4579 | gsym->object()->name().c_str()); | |
4580 | } | |
4581 | else | |
4582 | { | |
4583 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
4584 | _("relocation overflow: reference to '%s'"), | |
4585 | gsym->name()); | |
4586 | } | |
4587 | } | |
c34c98ed | 4588 | |
2e30d253 ILT |
4589 | return true; |
4590 | } | |
4591 | ||
4592 | // Perform a TLS relocation. | |
4593 | ||
fc51264f | 4594 | template<int size> |
2e30d253 | 4595 | inline void |
fc51264f L |
4596 | Target_x86_64<size>::Relocate::relocate_tls( |
4597 | const Relocate_info<size, false>* relinfo, | |
4598 | Target_x86_64<size>* target, | |
4599 | size_t relnum, | |
4600 | const elfcpp::Rela<size, false>& rela, | |
4601 | unsigned int r_type, | |
4602 | const Sized_symbol<size>* gsym, | |
4603 | const Symbol_value<size>* psymval, | |
4604 | unsigned char* view, | |
4605 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
4606 | section_size_type view_size) | |
2e30d253 | 4607 | { |
2e30d253 | 4608 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 4609 | |
fc51264f | 4610 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 4611 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 4612 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 4613 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 4614 | |
fc51264f | 4615 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
4616 | |
4617 | const bool is_final = (gsym == NULL | |
b3705d2a | 4618 | ? !parameters->options().shared() |
2e30d253 | 4619 | : gsym->final_value_is_known()); |
36171d64 | 4620 | tls::Tls_optimization optimized_type |
fc51264f | 4621 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
4622 | switch (r_type) |
4623 | { | |
56622147 | 4624 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
4625 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
4626 | { | |
4627 | // If this code sequence is used in a non-executable section, | |
4628 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
4629 | // on the assumption that it's being used by itself in a debug | |
4630 | // section. Therefore, in the unlikely event that the code | |
4631 | // sequence appears in a non-executable section, we simply | |
4632 | // leave it unoptimized. | |
4633 | optimized_type = tls::TLSOPT_NONE; | |
4634 | } | |
e041f13d | 4635 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 4636 | { |
62855347 ILT |
4637 | if (tls_segment == NULL) |
4638 | { | |
191f1a2d ILT |
4639 | gold_assert(parameters->errors()->error_count() > 0 |
4640 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4641 | return; |
4642 | } | |
2e30d253 | 4643 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 4644 | rela, r_type, value, view, |
2e30d253 ILT |
4645 | view_size); |
4646 | break; | |
4647 | } | |
7bf1f802 | 4648 | else |
2e702c99 RM |
4649 | { |
4650 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
4651 | ? GOT_TYPE_TLS_OFFSET | |
4652 | : GOT_TYPE_TLS_PAIR); | |
4653 | unsigned int got_offset; | |
4654 | if (gsym != NULL) | |
4655 | { | |
4656 | gold_assert(gsym->has_got_offset(got_type)); | |
4657 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
4658 | } | |
4659 | else | |
4660 | { | |
4661 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4662 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
4663 | got_offset = (object->local_got_offset(r_sym, got_type) | |
4664 | - target->got_size()); | |
4665 | } | |
4666 | if (optimized_type == tls::TLSOPT_TO_IE) | |
4667 | { | |
4668 | value = target->got_plt_section()->address() + got_offset; | |
d21f123b | 4669 | this->tls_gd_to_ie(relinfo, relnum, rela, r_type, |
2e702c99 RM |
4670 | value, view, address, view_size); |
4671 | break; | |
4672 | } | |
4673 | else if (optimized_type == tls::TLSOPT_NONE) | |
4674 | { | |
4675 | // Relocate the field with the offset of the pair of GOT | |
4676 | // entries. | |
6a41d30b | 4677 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 4678 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 4679 | address); |
2e702c99 RM |
4680 | break; |
4681 | } | |
4682 | } | |
72ec2876 | 4683 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 4684 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
4685 | break; |
4686 | ||
c2b45e22 CC |
4687 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
4688 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
4689 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
4690 | { | |
4691 | // See above comment for R_X86_64_TLSGD. | |
4692 | optimized_type = tls::TLSOPT_NONE; | |
4693 | } | |
c2b45e22 CC |
4694 | if (optimized_type == tls::TLSOPT_TO_LE) |
4695 | { | |
62855347 ILT |
4696 | if (tls_segment == NULL) |
4697 | { | |
191f1a2d ILT |
4698 | gold_assert(parameters->errors()->error_count() > 0 |
4699 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4700 | return; |
4701 | } | |
c2b45e22 | 4702 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
4703 | rela, r_type, value, view, |
4704 | view_size); | |
c2b45e22 CC |
4705 | break; |
4706 | } | |
4707 | else | |
2e702c99 RM |
4708 | { |
4709 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
4710 | ? GOT_TYPE_TLS_OFFSET | |
4711 | : GOT_TYPE_TLS_DESC); | |
4712 | unsigned int got_offset = 0; | |
a8df5856 ILT |
4713 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC |
4714 | && optimized_type == tls::TLSOPT_NONE) | |
4715 | { | |
4716 | // We created GOT entries in the .got.tlsdesc portion of | |
4717 | // the .got.plt section, but the offset stored in the | |
4718 | // symbol is the offset within .got.tlsdesc. | |
4719 | got_offset = (target->got_size() | |
4720 | + target->got_plt_section()->data_size()); | |
4721 | } | |
2e702c99 RM |
4722 | if (gsym != NULL) |
4723 | { | |
4724 | gold_assert(gsym->has_got_offset(got_type)); | |
4725 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
4726 | } | |
4727 | else | |
4728 | { | |
4729 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4730 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
4731 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 4732 | - target->got_size()); |
2e702c99 RM |
4733 | } |
4734 | if (optimized_type == tls::TLSOPT_TO_IE) | |
4735 | { | |
2e702c99 | 4736 | value = target->got_plt_section()->address() + got_offset; |
d21f123b | 4737 | this->tls_desc_gd_to_ie(relinfo, relnum, |
2e702c99 RM |
4738 | rela, r_type, value, view, address, |
4739 | view_size); | |
4740 | break; | |
4741 | } | |
4742 | else if (optimized_type == tls::TLSOPT_NONE) | |
4743 | { | |
4744 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4745 | { | |
4746 | // Relocate the field with the offset of the pair of GOT | |
4747 | // entries. | |
4748 | value = target->got_plt_section()->address() + got_offset; | |
4749 | Relocate_functions<size, false>::pcrela32(view, value, addend, | |
fc51264f | 4750 | address); |
2e702c99 RM |
4751 | } |
4752 | break; | |
4753 | } | |
4754 | } | |
c2b45e22 CC |
4755 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4756 | _("unsupported reloc %u"), r_type); | |
4757 | break; | |
4758 | ||
56622147 | 4759 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
4760 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
4761 | { | |
4762 | // See above comment for R_X86_64_TLSGD. | |
4763 | optimized_type = tls::TLSOPT_NONE; | |
4764 | } | |
e041f13d | 4765 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 4766 | { |
62855347 ILT |
4767 | if (tls_segment == NULL) |
4768 | { | |
191f1a2d ILT |
4769 | gold_assert(parameters->errors()->error_count() > 0 |
4770 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4771 | return; |
4772 | } | |
72ec2876 ILT |
4773 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
4774 | value, view, view_size); | |
4775 | break; | |
2e702c99 | 4776 | } |
7bf1f802 | 4777 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
4778 | { |
4779 | // Relocate the field with the offset of the GOT entry for | |
4780 | // the module index. | |
4781 | unsigned int got_offset; | |
4782 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
31d60480 | 4783 | - target->got_size()); |
6a41d30b | 4784 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 4785 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 4786 | address); |
2e702c99 RM |
4787 | break; |
4788 | } | |
72ec2876 | 4789 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 4790 | _("unsupported reloc %u"), r_type); |
2e30d253 | 4791 | break; |
0ffd9845 ILT |
4792 | |
4793 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
4794 | // This relocation type is used in debugging information. |
4795 | // In that case we need to not optimize the value. If the | |
4796 | // section is not executable, then we assume we should not | |
4797 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
4798 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
4799 | // R_X86_64_TLSLD. | |
4800 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
4801 | { | |
62855347 ILT |
4802 | if (tls_segment == NULL) |
4803 | { | |
191f1a2d ILT |
4804 | gold_assert(parameters->errors()->error_count() > 0 |
4805 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4806 | return; |
4807 | } | |
36171d64 CC |
4808 | value -= tls_segment->memsz(); |
4809 | } | |
fc51264f | 4810 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
4811 | break; |
4812 | ||
4813 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
4814 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
4815 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
4816 | { | |
62855347 ILT |
4817 | if (tls_segment == NULL) |
4818 | { | |
191f1a2d ILT |
4819 | gold_assert(parameters->errors()->error_count() > 0 |
4820 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4821 | return; |
4822 | } | |
36171d64 CC |
4823 | value -= tls_segment->memsz(); |
4824 | } | |
fc51264f | 4825 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 4826 | break; |
2e30d253 | 4827 | |
56622147 | 4828 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
24dd5808 CC |
4829 | if (gsym != NULL |
4830 | && gsym->is_undefined() | |
4831 | && parameters->options().output_is_executable()) | |
65d92137 CC |
4832 | { |
4833 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, | |
4834 | NULL, rela, | |
4835 | r_type, value, view, | |
4836 | view_size); | |
4837 | break; | |
4838 | } | |
4839 | else if (optimized_type == tls::TLSOPT_TO_LE) | |
56622147 | 4840 | { |
62855347 ILT |
4841 | if (tls_segment == NULL) |
4842 | { | |
191f1a2d ILT |
4843 | gold_assert(parameters->errors()->error_count() > 0 |
4844 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4845 | return; |
4846 | } | |
fc51264f L |
4847 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
4848 | tls_segment, rela, | |
4849 | r_type, value, view, | |
4850 | view_size); | |
56622147 ILT |
4851 | break; |
4852 | } | |
7bf1f802 | 4853 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
4854 | { |
4855 | // Relocate the field with the offset of the GOT entry for | |
4856 | // the tp-relative offset of the symbol. | |
4857 | unsigned int got_offset; | |
4858 | if (gsym != NULL) | |
4859 | { | |
4860 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); | |
4861 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
4862 | - target->got_size()); | |
4863 | } | |
4864 | else | |
4865 | { | |
4866 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4867 | gold_assert(object->local_has_got_offset(r_sym, | |
4868 | GOT_TYPE_TLS_OFFSET)); | |
4869 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
4870 | - target->got_size()); | |
4871 | } | |
6a41d30b | 4872 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 4873 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 4874 | address); |
2e702c99 RM |
4875 | break; |
4876 | } | |
56622147 ILT |
4877 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4878 | _("unsupported reloc type %u"), | |
4879 | r_type); | |
4880 | break; | |
0ffd9845 | 4881 | |
56622147 | 4882 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
4883 | if (tls_segment == NULL) |
4884 | { | |
191f1a2d ILT |
4885 | gold_assert(parameters->errors()->error_count() > 0 |
4886 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4887 | return; |
4888 | } | |
6a41d30b | 4889 | value -= tls_segment->memsz(); |
fc51264f | 4890 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 4891 | break; |
2e30d253 | 4892 | } |
2e30d253 ILT |
4893 | } |
4894 | ||
7bf1f802 ILT |
4895 | // Do a relocation in which we convert a TLS General-Dynamic to an |
4896 | // Initial-Exec. | |
4897 | ||
fc51264f | 4898 | template<int size> |
7bf1f802 | 4899 | inline void |
fc51264f L |
4900 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
4901 | const Relocate_info<size, false>* relinfo, | |
4902 | size_t relnum, | |
fc51264f L |
4903 | const elfcpp::Rela<size, false>& rela, |
4904 | unsigned int, | |
4905 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4906 | unsigned char* view, | |
4907 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
4908 | section_size_type view_size) | |
7bf1f802 | 4909 | { |
41194d9f L |
4910 | // For SIZE == 64: |
4911 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4912 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4913 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
4914 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
4915 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f L |
4916 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax |
4917 | // For SIZE == 32: | |
4918 | // leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4919 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4920 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax | |
4921 | // leaq foo@tlsgd(%rip),%rdi; | |
4922 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f | 4923 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax |
7bf1f802 | 4924 | |
7bf1f802 | 4925 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
7bf1f802 | 4926 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
ad961eab L |
4927 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0 |
4928 | || memcmp(view + 4, "\x66\x48\xff", 3) == 0)); | |
7bf1f802 | 4929 | |
41194d9f L |
4930 | if (size == 64) |
4931 | { | |
4932 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4933 | -4); | |
4934 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4935 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
4936 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
4937 | 16); | |
4938 | } | |
4939 | else | |
4940 | { | |
4941 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4942 | -3); | |
4943 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4944 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
4945 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
4946 | 15); | |
4947 | } | |
7bf1f802 | 4948 | |
c2b45e22 | 4949 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
4950 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
4951 | address); | |
7bf1f802 ILT |
4952 | |
4953 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4954 | // We can skip it. | |
4955 | this->skip_call_tls_get_addr_ = true; | |
4956 | } | |
4957 | ||
e041f13d | 4958 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
4959 | // Local-Exec. |
4960 | ||
fc51264f | 4961 | template<int size> |
2e30d253 | 4962 | inline void |
fc51264f L |
4963 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
4964 | const Relocate_info<size, false>* relinfo, | |
4965 | size_t relnum, | |
4966 | Output_segment* tls_segment, | |
4967 | const elfcpp::Rela<size, false>& rela, | |
4968 | unsigned int, | |
4969 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4970 | unsigned char* view, | |
4971 | section_size_type view_size) | |
2e30d253 | 4972 | { |
41194d9f L |
4973 | // For SIZE == 64: |
4974 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4975 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4976 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
4977 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
4978 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f L |
4979 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax |
4980 | // For SIZE == 32: | |
4981 | // leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4982 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4983 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax | |
4984 | // leaq foo@tlsgd(%rip),%rdi; | |
4985 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f | 4986 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax |
2e30d253 | 4987 | |
72ec2876 | 4988 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
72ec2876 | 4989 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
ad961eab L |
4990 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0 |
4991 | || memcmp(view + 4, "\x66\x48\xff", 3) == 0)); | |
41194d9f L |
4992 | |
4993 | if (size == 64) | |
4994 | { | |
4995 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4996 | -4); | |
4997 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4998 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
4999 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", | |
5000 | 16); | |
5001 | } | |
5002 | else | |
5003 | { | |
5004 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
5005 | -3); | |
5006 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
5007 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
2e30d253 | 5008 | |
41194d9f L |
5009 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", |
5010 | 15); | |
5011 | } | |
2e30d253 | 5012 | |
6a41d30b | 5013 | value -= tls_segment->memsz(); |
fc51264f | 5014 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
5015 | |
5016 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
5017 | // We can skip it. | |
5018 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
5019 | } |
5020 | ||
c2b45e22 CC |
5021 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
5022 | ||
fc51264f | 5023 | template<int size> |
c2b45e22 | 5024 | inline void |
fc51264f L |
5025 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
5026 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 | 5027 | size_t relnum, |
fc51264f | 5028 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 5029 | unsigned int r_type, |
fc51264f | 5030 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 5031 | unsigned char* view, |
fc51264f | 5032 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
5033 | section_size_type view_size) |
5034 | { | |
5035 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
5036 | { | |
ccf20d46 L |
5037 | // LP64: leaq foo@tlsdesc(%rip), %rax |
5038 | // ==> movq foo@gottpoff(%rip), %rax | |
5039 | // X32: rex leal foo@tlsdesc(%rip), %eax | |
5040 | // ==> rex movl foo@gottpoff(%rip), %eax | |
c2b45e22 CC |
5041 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
5042 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
5043 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
ccf20d46 L |
5044 | (((view[-3] & 0xfb) == 0x48 |
5045 | || (size == 32 && (view[-3] & 0xfb) == 0x40)) | |
6d520e36 L |
5046 | && view[-2] == 0x8d |
5047 | && (view[-1] & 0xc7) == 0x05)); | |
c2b45e22 CC |
5048 | view[-2] = 0x8b; |
5049 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 5050 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
5051 | } |
5052 | else | |
5053 | { | |
ccf20d46 L |
5054 | // LP64: call *foo@tlscall(%rax) |
5055 | // ==> xchg %ax, %ax | |
5056 | // X32: call *foo@tlscall(%eax) | |
5057 | // ==> nopl (%rax) | |
c2b45e22 CC |
5058 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); |
5059 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
ccf20d46 L |
5060 | int prefix = 0; |
5061 | if (size == 32 && view[0] == 0x67) | |
5062 | { | |
5063 | tls::check_range(relinfo, relnum, rela.get_r_offset(), | |
5064 | view_size, 3); | |
5065 | prefix = 1; | |
5066 | } | |
c2b45e22 | 5067 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
ccf20d46 L |
5068 | view[prefix] == 0xff && view[prefix + 1] == 0x10); |
5069 | if (prefix) | |
5070 | { | |
5071 | view[0] = 0x0f; | |
5072 | view[1] = 0x1f; | |
5073 | view[2] = 0x00; | |
5074 | } | |
5075 | else | |
5076 | { | |
5077 | view[0] = 0x66; | |
5078 | view[1] = 0x90; | |
5079 | } | |
c2b45e22 CC |
5080 | } |
5081 | } | |
5082 | ||
5083 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
5084 | ||
fc51264f | 5085 | template<int size> |
c2b45e22 | 5086 | inline void |
fc51264f L |
5087 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
5088 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
5089 | size_t relnum, |
5090 | Output_segment* tls_segment, | |
fc51264f | 5091 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 5092 | unsigned int r_type, |
fc51264f | 5093 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
5094 | unsigned char* view, |
5095 | section_size_type view_size) | |
5096 | { | |
5097 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
5098 | { | |
ccf20d46 L |
5099 | // LP64: leaq foo@tlsdesc(%rip), %rax |
5100 | // ==> movq foo@tpoff, %rax | |
5101 | // X32: rex leal foo@tlsdesc(%rip), %eax | |
5102 | // ==> rex movl foo@tpoff, %eax | |
c2b45e22 CC |
5103 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
5104 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
5105 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
ccf20d46 L |
5106 | (((view[-3] & 0xfb) == 0x48 |
5107 | || (size == 32 && (view[-3] & 0xfb) == 0x40)) | |
6d520e36 L |
5108 | && view[-2] == 0x8d |
5109 | && (view[-1] & 0xc7) == 0x05)); | |
ccf20d46 | 5110 | view[-3] = (view[-3] & 0x48) | ((view[-3] >> 2) & 1); |
c2b45e22 | 5111 | view[-2] = 0xc7; |
6d520e36 | 5112 | view[-1] = 0xc0 | ((view[-1] >> 3) & 7); |
c2b45e22 | 5113 | value -= tls_segment->memsz(); |
fc51264f | 5114 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
5115 | } |
5116 | else | |
5117 | { | |
ccf20d46 L |
5118 | // LP64: call *foo@tlscall(%rax) |
5119 | // ==> xchg %ax, %ax | |
5120 | // X32: call *foo@tlscall(%eax) | |
5121 | // ==> nopl (%rax) | |
c2b45e22 CC |
5122 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); |
5123 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
ccf20d46 L |
5124 | int prefix = 0; |
5125 | if (size == 32 && view[0] == 0x67) | |
5126 | { | |
5127 | tls::check_range(relinfo, relnum, rela.get_r_offset(), | |
5128 | view_size, 3); | |
5129 | prefix = 1; | |
5130 | } | |
c2b45e22 | 5131 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
ccf20d46 L |
5132 | view[prefix] == 0xff && view[prefix + 1] == 0x10); |
5133 | if (prefix) | |
5134 | { | |
5135 | view[0] = 0x0f; | |
5136 | view[1] = 0x1f; | |
5137 | view[2] = 0x00; | |
5138 | } | |
5139 | else | |
5140 | { | |
5141 | view[0] = 0x66; | |
5142 | view[1] = 0x90; | |
5143 | } | |
c2b45e22 CC |
5144 | } |
5145 | } | |
5146 | ||
fc51264f | 5147 | template<int size> |
2e30d253 | 5148 | inline void |
fc51264f L |
5149 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
5150 | const Relocate_info<size, false>* relinfo, | |
5151 | size_t relnum, | |
5152 | Output_segment*, | |
5153 | const elfcpp::Rela<size, false>& rela, | |
5154 | unsigned int, | |
5155 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
5156 | unsigned char* view, | |
5157 | section_size_type view_size) | |
2e30d253 | 5158 | { |
72ec2876 | 5159 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
d2cf1c6c | 5160 | // For SIZE == 64: |
72ec2876 ILT |
5161 | // ... leq foo@dtpoff(%rax),%reg |
5162 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
d2cf1c6c L |
5163 | // For SIZE == 32: |
5164 | // ... leq foo@dtpoff(%rax),%reg | |
5165 | // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
ad961eab L |
5166 | // leaq foo@tlsld(%rip),%rdi; call *__tls_get_addr@GOTPCREL(%rip) |
5167 | // For SIZE == 64: | |
5168 | // ... leq foo@dtpoff(%rax),%reg | |
5169 | // ==> .word 0x6666; .byte 0x6666; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
5170 | // For SIZE == 32: | |
5171 | // ... leq foo@dtpoff(%rax),%reg | |
5172 | // ==> nopw 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 5173 | |
72ec2876 ILT |
5174 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
5175 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 5176 | |
72ec2876 | 5177 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 5178 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); |
72ec2876 | 5179 | |
ad961eab L |
5180 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
5181 | view[4] == 0xe8 || view[4] == 0xff); | |
72ec2876 | 5182 | |
ad961eab L |
5183 | if (view[4] == 0xe8) |
5184 | { | |
5185 | if (size == 64) | |
5186 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
5187 | else | |
5188 | memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12); | |
5189 | } | |
d2cf1c6c | 5190 | else |
ad961eab L |
5191 | { |
5192 | if (size == 64) | |
5193 | memcpy(view - 3, "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", | |
5194 | 13); | |
5195 | else | |
5196 | memcpy(view - 3, "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", | |
5197 | 13); | |
5198 | } | |
72ec2876 ILT |
5199 | |
5200 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
5201 | // We can skip it. | |
5202 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
5203 | } |
5204 | ||
56622147 ILT |
5205 | // Do a relocation in which we convert a TLS Initial-Exec to a |
5206 | // Local-Exec. | |
5207 | ||
fc51264f | 5208 | template<int size> |
56622147 | 5209 | inline void |
fc51264f L |
5210 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
5211 | const Relocate_info<size, false>* relinfo, | |
5212 | size_t relnum, | |
5213 | Output_segment* tls_segment, | |
5214 | const elfcpp::Rela<size, false>& rela, | |
5215 | unsigned int, | |
5216 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
5217 | unsigned char* view, | |
5218 | section_size_type view_size) | |
56622147 ILT |
5219 | { |
5220 | // We need to examine the opcodes to figure out which instruction we | |
5221 | // are looking at. | |
5222 | ||
5223 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
5224 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
5225 | ||
5226 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
5227 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
5228 | ||
5229 | unsigned char op1 = view[-3]; | |
5230 | unsigned char op2 = view[-2]; | |
5231 | unsigned char op3 = view[-1]; | |
5232 | unsigned char reg = op3 >> 3; | |
5233 | ||
5234 | if (op2 == 0x8b) | |
5235 | { | |
5236 | // movq | |
5237 | if (op1 == 0x4c) | |
2e702c99 | 5238 | view[-3] = 0x49; |
e749cab8 L |
5239 | else if (size == 32 && op1 == 0x44) |
5240 | view[-3] = 0x41; | |
56622147 ILT |
5241 | view[-2] = 0xc7; |
5242 | view[-1] = 0xc0 | reg; | |
5243 | } | |
5244 | else if (reg == 4) | |
5245 | { | |
5246 | // Special handling for %rsp. | |
5247 | if (op1 == 0x4c) | |
2e702c99 | 5248 | view[-3] = 0x49; |
e749cab8 L |
5249 | else if (size == 32 && op1 == 0x44) |
5250 | view[-3] = 0x41; | |
56622147 ILT |
5251 | view[-2] = 0x81; |
5252 | view[-1] = 0xc0 | reg; | |
5253 | } | |
5254 | else | |
5255 | { | |
5256 | // addq | |
5257 | if (op1 == 0x4c) | |
2e702c99 | 5258 | view[-3] = 0x4d; |
e749cab8 L |
5259 | else if (size == 32 && op1 == 0x44) |
5260 | view[-3] = 0x45; | |
56622147 ILT |
5261 | view[-2] = 0x8d; |
5262 | view[-1] = 0x80 | reg | (reg << 3); | |
5263 | } | |
5264 | ||
65d92137 CC |
5265 | if (tls_segment != NULL) |
5266 | value -= tls_segment->memsz(); | |
fc51264f | 5267 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
5268 | } |
5269 | ||
2e30d253 ILT |
5270 | // Relocate section data. |
5271 | ||
fc51264f | 5272 | template<int size> |
2e30d253 | 5273 | void |
fc51264f L |
5274 | Target_x86_64<size>::relocate_section( |
5275 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
5276 | unsigned int sh_type, |
5277 | const unsigned char* prelocs, | |
5278 | size_t reloc_count, | |
5279 | Output_section* output_section, | |
5280 | bool needs_special_offset_handling, | |
5281 | unsigned char* view, | |
fc51264f | 5282 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
5283 | section_size_type view_size, |
5284 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 | 5285 | { |
4d625b70 CC |
5286 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5287 | Classify_reloc; | |
5288 | ||
2e30d253 ILT |
5289 | gold_assert(sh_type == elfcpp::SHT_RELA); |
5290 | ||
4d625b70 CC |
5291 | gold::relocate_section<size, false, Target_x86_64<size>, Relocate, |
5292 | gold::Default_comdat_behavior, Classify_reloc>( | |
2e30d253 ILT |
5293 | relinfo, |
5294 | this, | |
5295 | prelocs, | |
5296 | reloc_count, | |
730cdc88 ILT |
5297 | output_section, |
5298 | needs_special_offset_handling, | |
2e30d253 ILT |
5299 | view, |
5300 | address, | |
364c7fa5 ILT |
5301 | view_size, |
5302 | reloc_symbol_changes); | |
2e30d253 ILT |
5303 | } |
5304 | ||
94a3fc8b CC |
5305 | // Apply an incremental relocation. Incremental relocations always refer |
5306 | // to global symbols. | |
5307 | ||
fc51264f | 5308 | template<int size> |
94a3fc8b | 5309 | void |
fc51264f L |
5310 | Target_x86_64<size>::apply_relocation( |
5311 | const Relocate_info<size, false>* relinfo, | |
5312 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 5313 | unsigned int r_type, |
fc51264f | 5314 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
5315 | const Symbol* gsym, |
5316 | unsigned char* view, | |
fc51264f | 5317 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
5318 | section_size_type view_size) |
5319 | { | |
fc51264f | 5320 | gold::apply_relocation<size, false, Target_x86_64<size>, |
618d6666 | 5321 | typename Target_x86_64<size>::Relocate>( |
94a3fc8b CC |
5322 | relinfo, |
5323 | this, | |
5324 | r_offset, | |
5325 | r_type, | |
5326 | r_addend, | |
5327 | gsym, | |
5328 | view, | |
5329 | address, | |
5330 | view_size); | |
5331 | } | |
5332 | ||
4d625b70 | 5333 | // Scan the relocs during a relocatable link. |
6a74a719 | 5334 | |
fc51264f | 5335 | template<int size> |
4d625b70 CC |
5336 | void |
5337 | Target_x86_64<size>::scan_relocatable_relocs( | |
5338 | Symbol_table* symtab, | |
5339 | Layout* layout, | |
5340 | Sized_relobj_file<size, false>* object, | |
5341 | unsigned int data_shndx, | |
5342 | unsigned int sh_type, | |
5343 | const unsigned char* prelocs, | |
5344 | size_t reloc_count, | |
5345 | Output_section* output_section, | |
5346 | bool needs_special_offset_handling, | |
5347 | size_t local_symbol_count, | |
5348 | const unsigned char* plocal_symbols, | |
5349 | Relocatable_relocs* rr) | |
6a74a719 | 5350 | { |
4d625b70 CC |
5351 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5352 | Classify_reloc; | |
5353 | typedef gold::Default_scan_relocatable_relocs<Classify_reloc> | |
5354 | Scan_relocatable_relocs; | |
6a74a719 | 5355 | |
4d625b70 | 5356 | gold_assert(sh_type == elfcpp::SHT_RELA); |
6a74a719 | 5357 | |
4d625b70 CC |
5358 | gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>( |
5359 | symtab, | |
5360 | layout, | |
5361 | object, | |
5362 | data_shndx, | |
5363 | prelocs, | |
5364 | reloc_count, | |
5365 | output_section, | |
5366 | needs_special_offset_handling, | |
5367 | local_symbol_count, | |
5368 | plocal_symbols, | |
5369 | rr); | |
6a74a719 ILT |
5370 | } |
5371 | ||
4d625b70 | 5372 | // Scan the relocs for --emit-relocs. |
6a74a719 | 5373 | |
fc51264f | 5374 | template<int size> |
6a74a719 | 5375 | void |
4d625b70 | 5376 | Target_x86_64<size>::emit_relocs_scan( |
fc51264f L |
5377 | Symbol_table* symtab, |
5378 | Layout* layout, | |
5379 | Sized_relobj_file<size, false>* object, | |
5380 | unsigned int data_shndx, | |
5381 | unsigned int sh_type, | |
5382 | const unsigned char* prelocs, | |
5383 | size_t reloc_count, | |
5384 | Output_section* output_section, | |
5385 | bool needs_special_offset_handling, | |
5386 | size_t local_symbol_count, | |
4d625b70 | 5387 | const unsigned char* plocal_syms, |
fc51264f | 5388 | Relocatable_relocs* rr) |
6a74a719 | 5389 | { |
4d625b70 CC |
5390 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5391 | Classify_reloc; | |
5392 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> | |
5393 | Emit_relocs_strategy; | |
6a74a719 | 5394 | |
4d625b70 | 5395 | gold_assert(sh_type == elfcpp::SHT_RELA); |
6a74a719 | 5396 | |
4d625b70 | 5397 | gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>( |
6a74a719 ILT |
5398 | symtab, |
5399 | layout, | |
5400 | object, | |
5401 | data_shndx, | |
5402 | prelocs, | |
5403 | reloc_count, | |
5404 | output_section, | |
5405 | needs_special_offset_handling, | |
5406 | local_symbol_count, | |
4d625b70 | 5407 | plocal_syms, |
6a74a719 ILT |
5408 | rr); |
5409 | } | |
5410 | ||
5411 | // Relocate a section during a relocatable link. | |
5412 | ||
fc51264f | 5413 | template<int size> |
6a74a719 | 5414 | void |
7404fe1b | 5415 | Target_x86_64<size>::relocate_relocs( |
fc51264f | 5416 | const Relocate_info<size, false>* relinfo, |
6a74a719 ILT |
5417 | unsigned int sh_type, |
5418 | const unsigned char* prelocs, | |
5419 | size_t reloc_count, | |
5420 | Output_section* output_section, | |
62fe925a | 5421 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
6a74a719 | 5422 | unsigned char* view, |
fc51264f | 5423 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
5424 | section_size_type view_size, |
5425 | unsigned char* reloc_view, | |
5426 | section_size_type reloc_view_size) | |
5427 | { | |
4d625b70 CC |
5428 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5429 | Classify_reloc; | |
5430 | ||
6a74a719 ILT |
5431 | gold_assert(sh_type == elfcpp::SHT_RELA); |
5432 | ||
4d625b70 | 5433 | gold::relocate_relocs<size, false, Classify_reloc>( |
6a74a719 ILT |
5434 | relinfo, |
5435 | prelocs, | |
5436 | reloc_count, | |
5437 | output_section, | |
5438 | offset_in_output_section, | |
6a74a719 ILT |
5439 | view, |
5440 | view_address, | |
5441 | view_size, | |
5442 | reloc_view, | |
5443 | reloc_view_size); | |
5444 | } | |
5445 | ||
4fb6c25d ILT |
5446 | // Return the value to use for a dynamic which requires special |
5447 | // treatment. This is how we support equality comparisons of function | |
5448 | // pointers across shared library boundaries, as described in the | |
5449 | // processor specific ABI supplement. | |
5450 | ||
fc51264f | 5451 | template<int size> |
4fb6c25d | 5452 | uint64_t |
fc51264f | 5453 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
5454 | { |
5455 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 5456 | return this->plt_address_for_global(gsym); |
4fb6c25d ILT |
5457 | } |
5458 | ||
2e30d253 ILT |
5459 | // Return a string used to fill a code section with nops to take up |
5460 | // the specified length. | |
5461 | ||
fc51264f | 5462 | template<int size> |
2e30d253 | 5463 | std::string |
fc51264f | 5464 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
5465 | { |
5466 | if (length >= 16) | |
5467 | { | |
5468 | // Build a jmpq instruction to skip over the bytes. | |
5469 | unsigned char jmp[5]; | |
5470 | jmp[0] = 0xe9; | |
04bf7072 | 5471 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 | 5472 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2e702c99 | 5473 | + std::string(length - 5, static_cast<char>(0x90))); |
2e30d253 ILT |
5474 | } |
5475 | ||
5476 | // Nop sequences of various lengths. | |
76677ad0 CC |
5477 | const char nop1[1] = { '\x90' }; // nop |
5478 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
5479 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
5480 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
2e702c99 | 5481 | '\x00'}; |
76677ad0 CC |
5482 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) |
5483 | '\x00', '\x00' }; | |
5484 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
2e702c99 | 5485 | '\x44', '\x00', '\x00' }; |
76677ad0 | 5486 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) |
2e702c99 | 5487 | '\x00', '\x00', '\x00', |
76677ad0 CC |
5488 | '\x00' }; |
5489 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
2e702c99 | 5490 | '\x00', '\x00', '\x00', |
76677ad0 CC |
5491 | '\x00', '\x00' }; |
5492 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
2e702c99 | 5493 | '\x84', '\x00', '\x00', |
76677ad0 CC |
5494 | '\x00', '\x00', '\x00' }; |
5495 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
2e702c99 | 5496 | '\x1f', '\x84', '\x00', |
76677ad0 CC |
5497 | '\x00', '\x00', '\x00', |
5498 | '\x00' }; | |
5499 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
2e702c99 | 5500 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
5501 | '\x00', '\x00', '\x00', |
5502 | '\x00', '\x00' }; | |
5503 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
2e702c99 | 5504 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
5505 | '\x84', '\x00', '\x00', |
5506 | '\x00', '\x00', '\x00' }; | |
5507 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
2e702c99 | 5508 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
5509 | '\x1f', '\x84', '\x00', |
5510 | '\x00', '\x00', '\x00', | |
2e702c99 | 5511 | '\x00' }; |
76677ad0 | 5512 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 5513 | '\x66', '\x66', '\x2e', // data16 |
76677ad0 CC |
5514 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
5515 | '\x00', '\x00', '\x00', | |
2e702c99 | 5516 | '\x00', '\x00' }; |
76677ad0 | 5517 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 5518 | '\x66', '\x66', '\x66', // data16; data16 |
76677ad0 CC |
5519 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
5520 | '\x84', '\x00', '\x00', | |
2e702c99 | 5521 | '\x00', '\x00', '\x00' }; |
2e30d253 ILT |
5522 | |
5523 | const char* nops[16] = { | |
5524 | NULL, | |
5525 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
5526 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
5527 | }; | |
5528 | ||
5529 | return std::string(nops[length], length); | |
5530 | } | |
5531 | ||
e291e7b9 ILT |
5532 | // Return the addend to use for a target specific relocation. The |
5533 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
5534 | // symbol. We want to set the addend is the offset of the local | |
5535 | // symbol in the TLS segment. | |
5536 | ||
fc51264f | 5537 | template<int size> |
e291e7b9 | 5538 | uint64_t |
fc51264f L |
5539 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
5540 | uint64_t) const | |
e291e7b9 ILT |
5541 | { |
5542 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
5543 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
5544 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
5545 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 5546 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
5547 | gold_assert(psymval->is_tls_symbol()); |
5548 | // The value of a TLS symbol is the offset in the TLS segment. | |
5549 | return psymval->value(ti.object, 0); | |
5550 | } | |
5551 | ||
02d7cd44 ILT |
5552 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
5553 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
5554 | // assembler can not write out the difference between two labels in | |
5555 | // different sections, so instead of using a pc-relative value they | |
5556 | // use an offset from the GOT. | |
5557 | ||
fc51264f | 5558 | template<int size> |
02d7cd44 | 5559 | uint64_t |
fc51264f | 5560 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
5561 | { |
5562 | gold_assert(this->global_offset_table_ != NULL); | |
5563 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 5564 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
5565 | return ssym->value(); |
5566 | } | |
5567 | ||
364c7fa5 | 5568 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 5569 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
5570 | // code. We have to change the function so that it always ensures |
5571 | // that it has enough stack space to run some random function. | |
5572 | ||
4fc1b9d4 L |
5573 | static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 }; |
5574 | static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 }; | |
5575 | static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 }; | |
5576 | ||
5577 | static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 }; | |
5578 | static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 }; | |
5579 | static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 }; | |
5580 | ||
fc51264f | 5581 | template<int size> |
364c7fa5 | 5582 | void |
fc51264f L |
5583 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
5584 | section_offset_type fnoffset, | |
5585 | section_size_type fnsize, | |
6e0813d3 CC |
5586 | const unsigned char*, |
5587 | size_t, | |
fc51264f L |
5588 | unsigned char* view, |
5589 | section_size_type view_size, | |
5590 | std::string* from, | |
5591 | std::string* to) const | |
364c7fa5 | 5592 | { |
4fc1b9d4 L |
5593 | const char* const cmp_insn = reinterpret_cast<const char*> |
5594 | (size == 32 ? cmp_insn_32 : cmp_insn_64); | |
5595 | const char* const lea_r10_insn = reinterpret_cast<const char*> | |
5596 | (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64); | |
5597 | const char* const lea_r11_insn = reinterpret_cast<const char*> | |
5598 | (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64); | |
5599 | ||
5600 | const size_t cmp_insn_len = | |
5601 | (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64)); | |
5602 | const size_t lea_r10_insn_len = | |
5603 | (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64)); | |
5604 | const size_t lea_r11_insn_len = | |
5605 | (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64)); | |
5606 | const size_t nop_len = (size == 32 ? 7 : 8); | |
5607 | ||
364c7fa5 ILT |
5608 | // The function starts with a comparison of the stack pointer and a |
5609 | // field in the TCB. This is followed by a jump. | |
5610 | ||
5611 | // cmp %fs:NN,%rsp | |
4fc1b9d4 L |
5612 | if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len) |
5613 | && fnsize > nop_len + 1) | |
364c7fa5 ILT |
5614 | { |
5615 | // We will call __morestack if the carry flag is set after this | |
5616 | // comparison. We turn the comparison into an stc instruction | |
5617 | // and some nops. | |
5618 | view[fnoffset] = '\xf9'; | |
4fc1b9d4 | 5619 | this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len); |
364c7fa5 ILT |
5620 | } |
5621 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
5622 | // lea NN(%rsp),%r11 |
5623 | else if ((this->match_view(view, view_size, fnoffset, | |
4fc1b9d4 | 5624 | lea_r10_insn, lea_r10_insn_len) |
cbc999b9 | 5625 | || this->match_view(view, view_size, fnoffset, |
4fc1b9d4 | 5626 | lea_r11_insn, lea_r11_insn_len)) |
364c7fa5 ILT |
5627 | && fnsize > 8) |
5628 | { | |
5629 | // This is loading an offset from the stack pointer for a | |
5630 | // comparison. The offset is negative, so we decrease the | |
5631 | // offset by the amount of space we need for the stack. This | |
5632 | // means we will avoid calling __morestack if there happens to | |
5633 | // be plenty of space on the stack already. | |
5634 | unsigned char* pval = view + fnoffset + 4; | |
5635 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
5636 | val -= parameters->options().split_stack_adjust_size(); | |
5637 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
5638 | } | |
5639 | else | |
5640 | { | |
5641 | if (!object->has_no_split_stack()) | |
5642 | object->error(_("failed to match split-stack sequence at " | |
5643 | "section %u offset %0zx"), | |
ac33a407 | 5644 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
5645 | return; |
5646 | } | |
5647 | ||
5648 | // We have to change the function so that it calls | |
5649 | // __morestack_non_split instead of __morestack. The former will | |
5650 | // allocate additional stack space. | |
5651 | *from = "__morestack"; | |
5652 | *to = "__morestack_non_split"; | |
5653 | } | |
5654 | ||
2e702c99 RM |
5655 | // The selector for x86_64 object files. Note this is never instantiated |
5656 | // directly. It's only used in Target_selector_x86_64_nacl, below. | |
2e30d253 | 5657 | |
fc51264f | 5658 | template<int size> |
36959681 | 5659 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
5660 | { |
5661 | public: | |
5662 | Target_selector_x86_64() | |
fc51264f | 5663 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
2e702c99 | 5664 | (size == 64 |
fc51264f | 5665 | ? "elf64-x86-64" : "elf32-x86-64"), |
2e702c99 | 5666 | (size == 64 |
fc51264f L |
5667 | ? "elf64-x86-64-freebsd" |
5668 | : "elf32-x86-64-freebsd"), | |
5669 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
5670 | { } |
5671 | ||
5672 | Target* | |
e96caa79 | 5673 | do_instantiate_target() |
fc51264f | 5674 | { return new Target_x86_64<size>(); } |
36959681 | 5675 | |
2e30d253 ILT |
5676 | }; |
5677 | ||
2e702c99 RM |
5678 | // NaCl variant. It uses different PLT contents. |
5679 | ||
5680 | template<int size> | |
5681 | class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size> | |
5682 | { | |
5683 | public: | |
5684 | Output_data_plt_x86_64_nacl(Layout* layout, | |
5685 | Output_data_got<64, false>* got, | |
57b2284c | 5686 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5687 | Output_data_space* got_irelative) |
5688 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
5689 | got, got_plt, got_irelative) | |
5690 | { } | |
5691 | ||
5692 | Output_data_plt_x86_64_nacl(Layout* layout, | |
5693 | Output_data_got<64, false>* got, | |
57b2284c | 5694 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5695 | Output_data_space* got_irelative, |
5696 | unsigned int plt_count) | |
5697 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
5698 | got, got_plt, got_irelative, | |
5699 | plt_count) | |
5700 | { } | |
5701 | ||
5702 | protected: | |
5703 | virtual unsigned int | |
5704 | do_get_plt_entry_size() const | |
5705 | { return plt_entry_size; } | |
5706 | ||
5707 | virtual void | |
5708 | do_add_eh_frame(Layout* layout) | |
5709 | { | |
5710 | layout->add_eh_frame_for_plt(this, | |
5711 | this->plt_eh_frame_cie, | |
5712 | this->plt_eh_frame_cie_size, | |
5713 | plt_eh_frame_fde, | |
5714 | plt_eh_frame_fde_size); | |
5715 | } | |
5716 | ||
5717 | virtual void | |
5718 | do_fill_first_plt_entry(unsigned char* pov, | |
5719 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
5720 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
5721 | ||
5722 | virtual unsigned int | |
5723 | do_fill_plt_entry(unsigned char* pov, | |
5724 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5725 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5726 | unsigned int got_offset, | |
5727 | unsigned int plt_offset, | |
5728 | unsigned int plt_index); | |
5729 | ||
5730 | virtual void | |
5731 | do_fill_tlsdesc_entry(unsigned char* pov, | |
5732 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5733 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5734 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
5735 | unsigned int tlsdesc_got_offset, | |
5736 | unsigned int plt_offset); | |
5737 | ||
5738 | private: | |
5739 | // The size of an entry in the PLT. | |
5740 | static const int plt_entry_size = 64; | |
5741 | ||
5742 | // The first entry in the PLT. | |
5743 | static const unsigned char first_plt_entry[plt_entry_size]; | |
5744 | ||
5745 | // Other entries in the PLT for an executable. | |
5746 | static const unsigned char plt_entry[plt_entry_size]; | |
5747 | ||
5748 | // The reserved TLSDESC entry in the PLT for an executable. | |
5749 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
5750 | ||
5751 | // The .eh_frame unwind information for the PLT. | |
5752 | static const int plt_eh_frame_fde_size = 32; | |
5753 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
5754 | }; | |
5755 | ||
5756 | template<int size> | |
5757 | class Target_x86_64_nacl : public Target_x86_64<size> | |
5758 | { | |
5759 | public: | |
5760 | Target_x86_64_nacl() | |
5761 | : Target_x86_64<size>(&x86_64_nacl_info) | |
5762 | { } | |
5763 | ||
5764 | virtual Output_data_plt_x86_64<size>* | |
5765 | do_make_data_plt(Layout* layout, | |
5766 | Output_data_got<64, false>* got, | |
57b2284c | 5767 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5768 | Output_data_space* got_irelative) |
5769 | { | |
5770 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
5771 | got_irelative); | |
5772 | } | |
5773 | ||
5774 | virtual Output_data_plt_x86_64<size>* | |
5775 | do_make_data_plt(Layout* layout, | |
5776 | Output_data_got<64, false>* got, | |
57b2284c | 5777 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5778 | Output_data_space* got_irelative, |
5779 | unsigned int plt_count) | |
5780 | { | |
5781 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
5782 | got_irelative, | |
5783 | plt_count); | |
5784 | } | |
5785 | ||
93f8221c RM |
5786 | virtual std::string |
5787 | do_code_fill(section_size_type length) const; | |
5788 | ||
2e702c99 RM |
5789 | private: |
5790 | static const Target::Target_info x86_64_nacl_info; | |
5791 | }; | |
5792 | ||
5793 | template<> | |
5794 | const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info = | |
5795 | { | |
5796 | 64, // size | |
5797 | false, // is_big_endian | |
5798 | elfcpp::EM_X86_64, // machine_code | |
5799 | false, // has_make_symbol | |
5800 | false, // has_resolve | |
5801 | true, // has_code_fill | |
5802 | true, // is_default_stack_executable | |
5803 | true, // can_icf_inline_merge_sections | |
5804 | '\0', // wrap_char | |
5805 | "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker | |
5806 | 0x20000, // default_text_segment_address | |
5807 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
5808 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
5809 | true, // isolate_execinstr | |
5810 | 0x10000000, // rosegment_gap | |
5811 | elfcpp::SHN_UNDEF, // small_common_shndx | |
5812 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
5813 | 0, // small_common_section_flags | |
5814 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
5815 | NULL, // attributes_section | |
a67858e0 | 5816 | NULL, // attributes_vendor |
8d9743bd MK |
5817 | "_start", // entry_symbol_name |
5818 | 32, // hash_entry_size | |
bce5a025 | 5819 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
2e702c99 RM |
5820 | }; |
5821 | ||
5822 | template<> | |
5823 | const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info = | |
5824 | { | |
5825 | 32, // size | |
5826 | false, // is_big_endian | |
5827 | elfcpp::EM_X86_64, // machine_code | |
5828 | false, // has_make_symbol | |
5829 | false, // has_resolve | |
5830 | true, // has_code_fill | |
5831 | true, // is_default_stack_executable | |
5832 | true, // can_icf_inline_merge_sections | |
5833 | '\0', // wrap_char | |
5834 | "/lib/ld-nacl-x86-64.so.1", // dynamic_linker | |
5835 | 0x20000, // default_text_segment_address | |
5836 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
5837 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
5838 | true, // isolate_execinstr | |
5839 | 0x10000000, // rosegment_gap | |
5840 | elfcpp::SHN_UNDEF, // small_common_shndx | |
5841 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
5842 | 0, // small_common_section_flags | |
5843 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
5844 | NULL, // attributes_section | |
a67858e0 | 5845 | NULL, // attributes_vendor |
8d9743bd MK |
5846 | "_start", // entry_symbol_name |
5847 | 32, // hash_entry_size | |
bce5a025 | 5848 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
2e702c99 RM |
5849 | }; |
5850 | ||
5851 | #define NACLMASK 0xe0 // 32-byte alignment mask. | |
5852 | ||
5853 | // The first entry in the PLT. | |
5854 | ||
5855 | template<int size> | |
5856 | const unsigned char | |
5857 | Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] = | |
5858 | { | |
5859 | 0xff, 0x35, // pushq contents of memory address | |
5860 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
5861 | 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11 | |
5862 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
5863 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
5864 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
5865 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
5866 | ||
5867 | // 9-byte nop sequence to pad out to the next 32-byte boundary. | |
dd0845d7 | 5868 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1) |
2e702c99 RM |
5869 | |
5870 | // 32 bytes of nop to pad out to the standard size | |
5871 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5872 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5873 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5874 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5875 | 0x66, // excess data32 prefix | |
5876 | 0x90 // nop | |
5877 | }; | |
5878 | ||
5879 | template<int size> | |
5880 | void | |
5881 | Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry( | |
5882 | unsigned char* pov, | |
5883 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5884 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
5885 | { | |
5886 | memcpy(pov, first_plt_entry, plt_entry_size); | |
5887 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
5888 | (got_address + 8 | |
5889 | - (plt_address + 2 + 4))); | |
5890 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
5891 | (got_address + 16 | |
5892 | - (plt_address + 9 + 4))); | |
5893 | } | |
5894 | ||
5895 | // Subsequent entries in the PLT. | |
5896 | ||
5897 | template<int size> | |
5898 | const unsigned char | |
5899 | Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] = | |
5900 | { | |
5901 | 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11 | |
5902 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
5903 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
5904 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
5905 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
5906 | ||
5907 | // 15-byte nop sequence to pad out to the next 32-byte boundary. | |
5908 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5909 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5910 | ||
5911 | // Lazy GOT entries point here (32-byte aligned). | |
5912 | 0x68, // pushq immediate | |
5913 | 0, 0, 0, 0, // replaced with index into relocation table | |
5914 | 0xe9, // jmp relative | |
5915 | 0, 0, 0, 0, // replaced with offset to start of .plt0 | |
5916 | ||
5917 | // 22 bytes of nop to pad out to the standard size. | |
5918 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5919 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5920 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax) | |
5921 | }; | |
5922 | ||
5923 | template<int size> | |
5924 | unsigned int | |
5925 | Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry( | |
5926 | unsigned char* pov, | |
5927 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5928 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5929 | unsigned int got_offset, | |
5930 | unsigned int plt_offset, | |
5931 | unsigned int plt_index) | |
5932 | { | |
5933 | memcpy(pov, plt_entry, plt_entry_size); | |
5934 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, | |
5935 | (got_address + got_offset | |
5936 | - (plt_address + plt_offset | |
5937 | + 3 + 4))); | |
5938 | ||
5939 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index); | |
5940 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 38, | |
5941 | - (plt_offset + 38 + 4)); | |
5942 | ||
5943 | return 32; | |
5944 | } | |
5945 | ||
5946 | // The reserved TLSDESC entry in the PLT. | |
5947 | ||
5948 | template<int size> | |
5949 | const unsigned char | |
5950 | Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] = | |
5951 | { | |
5952 | 0xff, 0x35, // pushq x(%rip) | |
5953 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
5954 | 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11 | |
5955 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
5956 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
5957 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
5958 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
5959 | ||
5960 | // 41 bytes of nop to pad out to the standard size. | |
5961 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5962 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5963 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5964 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5965 | 0x66, 0x66, // excess data32 prefixes | |
5966 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5967 | }; | |
5968 | ||
5969 | template<int size> | |
5970 | void | |
5971 | Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry( | |
5972 | unsigned char* pov, | |
5973 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5974 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5975 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
5976 | unsigned int tlsdesc_got_offset, | |
5977 | unsigned int plt_offset) | |
5978 | { | |
5979 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
5980 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
5981 | (got_address + 8 | |
5982 | - (plt_address + plt_offset | |
5983 | + 2 + 4))); | |
5984 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
5985 | (got_base | |
5986 | + tlsdesc_got_offset | |
5987 | - (plt_address + plt_offset | |
5988 | + 9 + 4))); | |
5989 | } | |
5990 | ||
5991 | // The .eh_frame unwind information for the PLT. | |
5992 | ||
5993 | template<int size> | |
5994 | const unsigned char | |
5995 | Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
5996 | { | |
5997 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
5998 | 0, 0, 0, 0, // Replaced with size of .plt. | |
5999 | 0, // Augmentation size. | |
6000 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
6001 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
6002 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
6003 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
6004 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
6005 | 13, // Block length. | |
6006 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
6007 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
6008 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
6009 | elfcpp::DW_OP_and, // & (%rip & 0x3f). | |
6010 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
6011 | elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25) | |
6012 | elfcpp::DW_OP_lit3, // Push 3. | |
6013 | elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3) | |
6014 | elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8 | |
6015 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
6016 | elfcpp::DW_CFA_nop | |
6017 | }; | |
6018 | ||
93f8221c RM |
6019 | // Return a string used to fill a code section with nops. |
6020 | // For NaCl, long NOPs are only valid if they do not cross | |
6021 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
6022 | template<int size> | |
6023 | std::string | |
6024 | Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const | |
6025 | { | |
6026 | return std::string(length, static_cast<char>(0x90)); | |
6027 | } | |
6028 | ||
2e702c99 RM |
6029 | // The selector for x86_64-nacl object files. |
6030 | ||
6031 | template<int size> | |
6032 | class Target_selector_x86_64_nacl | |
6033 | : public Target_selector_nacl<Target_selector_x86_64<size>, | |
6034 | Target_x86_64_nacl<size> > | |
6035 | { | |
6036 | public: | |
6037 | Target_selector_x86_64_nacl() | |
6038 | : Target_selector_nacl<Target_selector_x86_64<size>, | |
6039 | Target_x86_64_nacl<size> >("x86-64", | |
6040 | size == 64 | |
6041 | ? "elf64-x86-64-nacl" | |
6042 | : "elf32-x86-64-nacl", | |
6043 | size == 64 | |
6044 | ? "elf_x86_64_nacl" | |
6045 | : "elf32_x86_64_nacl") | |
6046 | { } | |
6047 | }; | |
6048 | ||
6049 | Target_selector_x86_64_nacl<64> target_selector_x86_64; | |
6050 | Target_selector_x86_64_nacl<32> target_selector_x32; | |
2e30d253 ILT |
6051 | |
6052 | } // End anonymous namespace. |