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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
219d1afa | 3 | // Copyright (C) 2006-2018 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 | ||
7a0c0a14 CC |
433 | class Output_data_plt_x86_64_bnd : public Output_data_plt_x86_64<64> |
434 | { | |
435 | public: | |
436 | Output_data_plt_x86_64_bnd(Layout* layout, | |
437 | Output_data_got<64, false>* got, | |
438 | Output_data_got_plt_x86_64* got_plt, | |
439 | Output_data_space* got_irelative) | |
440 | : Output_data_plt_x86_64<64>(layout, plt_entry_size, | |
441 | got, got_plt, got_irelative), | |
442 | aplt_offset_(0) | |
443 | { } | |
444 | ||
445 | Output_data_plt_x86_64_bnd(Layout* layout, | |
446 | Output_data_got<64, false>* got, | |
447 | Output_data_got_plt_x86_64* got_plt, | |
448 | Output_data_space* got_irelative, | |
449 | unsigned int plt_count) | |
450 | : Output_data_plt_x86_64<64>(layout, plt_entry_size, | |
451 | got, got_plt, got_irelative, | |
452 | plt_count), | |
453 | aplt_offset_(0) | |
454 | { } | |
455 | ||
456 | protected: | |
457 | virtual unsigned int | |
458 | do_get_plt_entry_size() const | |
459 | { return plt_entry_size; } | |
460 | ||
461 | // Return the PLT address to use for a global symbol. | |
462 | uint64_t | |
463 | do_address_for_global(const Symbol*); | |
464 | ||
465 | // Return the PLT address to use for a local symbol. | |
466 | uint64_t | |
467 | do_address_for_local(const Relobj*, unsigned int symndx); | |
468 | ||
469 | virtual void | |
470 | do_add_eh_frame(Layout* layout) | |
471 | { | |
472 | layout->add_eh_frame_for_plt(this, | |
473 | this->plt_eh_frame_cie, | |
474 | this->plt_eh_frame_cie_size, | |
475 | plt_eh_frame_fde, | |
476 | plt_eh_frame_fde_size); | |
477 | } | |
478 | ||
479 | virtual void | |
480 | do_fill_first_plt_entry(unsigned char* pov, | |
976e204b CC |
481 | elfcpp::Elf_types<64>::Elf_Addr got_addr, |
482 | elfcpp::Elf_types<64>::Elf_Addr plt_addr); | |
7a0c0a14 CC |
483 | |
484 | virtual unsigned int | |
485 | do_fill_plt_entry(unsigned char* pov, | |
976e204b CC |
486 | elfcpp::Elf_types<64>::Elf_Addr got_address, |
487 | elfcpp::Elf_types<64>::Elf_Addr plt_address, | |
7a0c0a14 CC |
488 | unsigned int got_offset, |
489 | unsigned int plt_offset, | |
490 | unsigned int plt_index); | |
491 | ||
492 | virtual void | |
493 | do_fill_tlsdesc_entry(unsigned char* pov, | |
976e204b CC |
494 | elfcpp::Elf_types<64>::Elf_Addr got_address, |
495 | elfcpp::Elf_types<64>::Elf_Addr plt_address, | |
496 | elfcpp::Elf_types<64>::Elf_Addr got_base, | |
7a0c0a14 CC |
497 | unsigned int tlsdesc_got_offset, |
498 | unsigned int plt_offset); | |
499 | ||
500 | void | |
501 | fill_aplt_entry(unsigned char* pov, | |
976e204b CC |
502 | elfcpp::Elf_types<64>::Elf_Addr got_address, |
503 | elfcpp::Elf_types<64>::Elf_Addr plt_address, | |
7a0c0a14 CC |
504 | unsigned int got_offset, |
505 | unsigned int plt_offset, | |
506 | unsigned int plt_index); | |
507 | ||
508 | private: | |
509 | // Set the final size. | |
510 | void | |
511 | set_final_data_size(); | |
512 | ||
513 | // Write out the BND PLT data. | |
514 | void | |
515 | do_write(Output_file*); | |
516 | ||
517 | // Offset of the Additional PLT (if using -z bndplt). | |
518 | unsigned int aplt_offset_; | |
519 | ||
520 | // The size of an entry in the PLT. | |
521 | static const int plt_entry_size = 16; | |
522 | ||
523 | // The size of an entry in the additional PLT. | |
524 | static const int aplt_entry_size = 8; | |
525 | ||
526 | // The first entry in the PLT. | |
527 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
528 | // procedure linkage table for both programs and shared objects." | |
529 | static const unsigned char first_plt_entry[plt_entry_size]; | |
530 | ||
531 | // Other entries in the PLT for an executable. | |
532 | static const unsigned char plt_entry[plt_entry_size]; | |
533 | ||
534 | // Entries in the additional PLT. | |
535 | static const unsigned char aplt_entry[aplt_entry_size]; | |
536 | ||
537 | // The reserved TLSDESC entry in the PLT for an executable. | |
538 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
539 | ||
540 | // The .eh_frame unwind information for the PLT. | |
541 | static const int plt_eh_frame_fde_size = 32; | |
542 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
543 | }; | |
544 | ||
3a4f096e ST |
545 | template<int size> |
546 | class Lazy_view | |
547 | { | |
548 | public: | |
549 | Lazy_view(Sized_relobj_file<size, false>* object, unsigned int data_shndx) | |
550 | : object_(object), data_shndx_(data_shndx), view_(NULL), view_size_(0) | |
551 | { } | |
552 | ||
553 | inline unsigned char | |
554 | operator[](size_t offset) | |
555 | { | |
556 | if (this->view_ == NULL) | |
557 | this->view_ = this->object_->section_contents(this->data_shndx_, | |
558 | &this->view_size_, | |
559 | true); | |
560 | if (offset >= this->view_size_) | |
561 | return 0; | |
562 | return this->view_[offset]; | |
563 | } | |
564 | ||
565 | private: | |
566 | Sized_relobj_file<size, false>* object_; | |
567 | unsigned int data_shndx_; | |
568 | const unsigned char* view_; | |
569 | section_size_type view_size_; | |
570 | }; | |
571 | ||
2e30d253 | 572 | // The x86_64 target class. |
d61c17ea ILT |
573 | // See the ABI at |
574 | // http://www.x86-64.org/documentation/abi.pdf | |
575 | // TLS info comes from | |
576 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 577 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 578 | |
fc51264f L |
579 | template<int size> |
580 | class Target_x86_64 : public Sized_target<size, false> | |
2e30d253 ILT |
581 | { |
582 | public: | |
e822f2b1 ILT |
583 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
584 | // uses only Elf64_Rela relocation entries with explicit addends." | |
fc51264f | 585 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
2e30d253 | 586 | |
2e702c99 RM |
587 | Target_x86_64(const Target::Target_info* info = &x86_64_info) |
588 | : Sized_target<size, false>(info), | |
67181c72 ILT |
589 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
590 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
591 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), | |
43819297 | 592 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
a2575bec CC |
593 | tls_base_symbol_defined_(false), isa_1_used_(0), isa_1_needed_(0), |
594 | feature_1_(0), object_feature_1_(0), seen_first_object_(false) | |
2e30d253 ILT |
595 | { } |
596 | ||
8a5e3e08 ILT |
597 | // Hook for a new output section. |
598 | void | |
599 | do_new_output_section(Output_section*) const; | |
600 | ||
6d03d481 ST |
601 | // Scan the relocations to look for symbol adjustments. |
602 | void | |
ad0f2072 | 603 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
604 | Layout* layout, |
605 | Sized_relobj_file<size, false>* object, | |
606 | unsigned int data_shndx, | |
607 | unsigned int sh_type, | |
608 | const unsigned char* prelocs, | |
609 | size_t reloc_count, | |
610 | Output_section* output_section, | |
611 | bool needs_special_offset_handling, | |
612 | size_t local_symbol_count, | |
613 | const unsigned char* plocal_symbols); | |
6d03d481 | 614 | |
2e30d253 ILT |
615 | // Scan the relocations to look for symbol adjustments. |
616 | void | |
ad0f2072 | 617 | scan_relocs(Symbol_table* symtab, |
2e30d253 | 618 | Layout* layout, |
fc51264f | 619 | Sized_relobj_file<size, false>* object, |
2e30d253 ILT |
620 | unsigned int data_shndx, |
621 | unsigned int sh_type, | |
622 | const unsigned char* prelocs, | |
623 | size_t reloc_count, | |
730cdc88 ILT |
624 | Output_section* output_section, |
625 | bool needs_special_offset_handling, | |
2e30d253 | 626 | size_t local_symbol_count, |
730cdc88 | 627 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
628 | |
629 | // Finalize the sections. | |
630 | void | |
f59f41f3 | 631 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 632 | |
4fb6c25d ILT |
633 | // Return the value to use for a dynamic which requires special |
634 | // treatment. | |
635 | uint64_t | |
636 | do_dynsym_value(const Symbol*) const; | |
637 | ||
2e30d253 ILT |
638 | // Relocate a section. |
639 | void | |
fc51264f | 640 | relocate_section(const Relocate_info<size, false>*, |
2e30d253 ILT |
641 | unsigned int sh_type, |
642 | const unsigned char* prelocs, | |
643 | size_t reloc_count, | |
730cdc88 ILT |
644 | Output_section* output_section, |
645 | bool needs_special_offset_handling, | |
2e30d253 | 646 | unsigned char* view, |
fc51264f | 647 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
364c7fa5 ILT |
648 | section_size_type view_size, |
649 | const Reloc_symbol_changes*); | |
2e30d253 | 650 | |
6a74a719 ILT |
651 | // Scan the relocs during a relocatable link. |
652 | void | |
ad0f2072 | 653 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 654 | Layout* layout, |
fc51264f | 655 | Sized_relobj_file<size, false>* object, |
6a74a719 ILT |
656 | unsigned int data_shndx, |
657 | unsigned int sh_type, | |
658 | const unsigned char* prelocs, | |
659 | size_t reloc_count, | |
660 | Output_section* output_section, | |
661 | bool needs_special_offset_handling, | |
662 | size_t local_symbol_count, | |
663 | const unsigned char* plocal_symbols, | |
664 | Relocatable_relocs*); | |
665 | ||
4d625b70 CC |
666 | // Scan the relocs for --emit-relocs. |
667 | void | |
668 | emit_relocs_scan(Symbol_table* symtab, | |
669 | Layout* layout, | |
670 | Sized_relobj_file<size, false>* object, | |
671 | unsigned int data_shndx, | |
672 | unsigned int sh_type, | |
673 | const unsigned char* prelocs, | |
674 | size_t reloc_count, | |
675 | Output_section* output_section, | |
676 | bool needs_special_offset_handling, | |
677 | size_t local_symbol_count, | |
678 | const unsigned char* plocal_syms, | |
679 | Relocatable_relocs* rr); | |
680 | ||
7404fe1b | 681 | // Emit relocations for a section. |
6a74a719 | 682 | void |
7404fe1b | 683 | relocate_relocs( |
fc51264f L |
684 | const Relocate_info<size, false>*, |
685 | unsigned int sh_type, | |
686 | const unsigned char* prelocs, | |
687 | size_t reloc_count, | |
688 | Output_section* output_section, | |
62fe925a | 689 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
fc51264f L |
690 | unsigned char* view, |
691 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
692 | section_size_type view_size, | |
693 | unsigned char* reloc_view, | |
694 | section_size_type reloc_view_size); | |
6a74a719 | 695 | |
2e30d253 ILT |
696 | // Return a string used to fill a code section with nops. |
697 | std::string | |
8851ecca | 698 | do_code_fill(section_size_type length) const; |
2e30d253 | 699 | |
9a2d6984 ILT |
700 | // Return whether SYM is defined by the ABI. |
701 | bool | |
9c2d0ef9 | 702 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
703 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
704 | ||
e291e7b9 ILT |
705 | // Return the symbol index to use for a target specific relocation. |
706 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
707 | // local symbol, which is an absolute reloc. | |
708 | unsigned int | |
709 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
710 | { | |
711 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
712 | return 0; | |
713 | } | |
714 | ||
715 | // Return the addend to use for a target specific relocation. | |
716 | uint64_t | |
717 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
718 | ||
7223e9ca | 719 | // Return the PLT section. |
67181c72 ILT |
720 | uint64_t |
721 | do_plt_address_for_global(const Symbol* gsym) const | |
722 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 723 | |
67181c72 ILT |
724 | uint64_t |
725 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
726 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 727 | |
b3ce541e ILT |
728 | // This function should be defined in targets that can use relocation |
729 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
730 | // and global_reloc_may_be_function_pointer) | |
731 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
732 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
4aebb631 RC |
733 | // pie binaries, safe ICF cannot be done by looking at only relocation |
734 | // types, and for certain cases (e.g. R_X86_64_PC32), the instruction | |
735 | // opcode is checked as well to distinguish a function call from taking | |
736 | // a function's pointer. | |
b3ce541e ILT |
737 | bool |
738 | do_can_check_for_function_pointers() const | |
4aebb631 | 739 | { return true; } |
b3ce541e | 740 | |
02d7cd44 ILT |
741 | // Return the base for a DW_EH_PE_datarel encoding. |
742 | uint64_t | |
743 | do_ehframe_datarel_base() const; | |
744 | ||
9b547ce6 | 745 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
746 | void |
747 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
748 | section_offset_type fnoffset, section_size_type fnsize, | |
6e0813d3 | 749 | const unsigned char* prelocs, size_t reloc_count, |
364c7fa5 ILT |
750 | unsigned char* view, section_size_type view_size, |
751 | std::string* from, std::string* to) const; | |
752 | ||
96f2030e | 753 | // Return the size of the GOT section. |
fe8718a4 | 754 | section_size_type |
0e70b911 | 755 | got_size() const |
96f2030e ILT |
756 | { |
757 | gold_assert(this->got_ != NULL); | |
758 | return this->got_->data_size(); | |
759 | } | |
760 | ||
0e70b911 CC |
761 | // Return the number of entries in the GOT. |
762 | unsigned int | |
763 | got_entry_count() const | |
764 | { | |
765 | if (this->got_ == NULL) | |
766 | return 0; | |
767 | return this->got_size() / 8; | |
768 | } | |
769 | ||
770 | // Return the number of entries in the PLT. | |
771 | unsigned int | |
772 | plt_entry_count() const; | |
773 | ||
774 | // Return the offset of the first non-reserved PLT entry. | |
775 | unsigned int | |
776 | first_plt_entry_offset() const; | |
777 | ||
778 | // Return the size of each PLT entry. | |
779 | unsigned int | |
780 | plt_entry_size() const; | |
781 | ||
41e83f2b L |
782 | // Return the size of each GOT entry. |
783 | unsigned int | |
784 | got_entry_size() const | |
785 | { return 8; }; | |
786 | ||
4829d394 | 787 | // Create the GOT section for an incremental update. |
dd74ae06 | 788 | Output_data_got_base* |
4829d394 CC |
789 | init_got_plt_for_update(Symbol_table* symtab, |
790 | Layout* layout, | |
791 | unsigned int got_count, | |
792 | unsigned int plt_count); | |
793 | ||
6fa2a40b CC |
794 | // Reserve a GOT entry for a local symbol, and regenerate any |
795 | // necessary dynamic relocations. | |
796 | void | |
797 | reserve_local_got_entry(unsigned int got_index, | |
2e702c99 | 798 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
799 | unsigned int r_sym, |
800 | unsigned int got_type); | |
801 | ||
802 | // Reserve a GOT entry for a global symbol, and regenerate any | |
803 | // necessary dynamic relocations. | |
804 | void | |
805 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
806 | unsigned int got_type); | |
807 | ||
4829d394 | 808 | // Register an existing PLT entry for a global symbol. |
4829d394 | 809 | void |
67181c72 ILT |
810 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
811 | Symbol* gsym); | |
4829d394 | 812 | |
26d3c67d CC |
813 | // Force a COPY relocation for a given symbol. |
814 | void | |
815 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
816 | ||
94a3fc8b CC |
817 | // Apply an incremental relocation. |
818 | void | |
fc51264f L |
819 | apply_relocation(const Relocate_info<size, false>* relinfo, |
820 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 821 | unsigned int r_type, |
fc51264f | 822 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
823 | const Symbol* gsym, |
824 | unsigned char* view, | |
fc51264f | 825 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
826 | section_size_type view_size); |
827 | ||
e291e7b9 ILT |
828 | // Add a new reloc argument, returning the index in the vector. |
829 | size_t | |
fc51264f | 830 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
831 | { |
832 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
833 | return this->tlsdesc_reloc_info_.size() - 1; | |
834 | } | |
835 | ||
2e702c99 RM |
836 | Output_data_plt_x86_64<size>* |
837 | make_data_plt(Layout* layout, | |
838 | Output_data_got<64, false>* got, | |
57b2284c | 839 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
840 | Output_data_space* got_irelative) |
841 | { | |
842 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); | |
843 | } | |
844 | ||
845 | Output_data_plt_x86_64<size>* | |
846 | make_data_plt(Layout* layout, | |
847 | Output_data_got<64, false>* got, | |
57b2284c | 848 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
849 | Output_data_space* got_irelative, |
850 | unsigned int plt_count) | |
851 | { | |
852 | return this->do_make_data_plt(layout, got, got_plt, got_irelative, | |
853 | plt_count); | |
854 | } | |
855 | ||
856 | virtual Output_data_plt_x86_64<size>* | |
857 | do_make_data_plt(Layout* layout, | |
858 | Output_data_got<64, false>* got, | |
57b2284c | 859 | Output_data_got_plt_x86_64* got_plt, |
7a0c0a14 | 860 | Output_data_space* got_irelative); |
2e702c99 RM |
861 | |
862 | virtual Output_data_plt_x86_64<size>* | |
863 | do_make_data_plt(Layout* layout, | |
864 | Output_data_got<64, false>* got, | |
57b2284c | 865 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 | 866 | Output_data_space* got_irelative, |
7a0c0a14 | 867 | unsigned int plt_count); |
2e702c99 | 868 | |
2e30d253 ILT |
869 | private: |
870 | // The class which scans relocations. | |
a036edd8 | 871 | class Scan |
2e30d253 | 872 | { |
a036edd8 ILT |
873 | public: |
874 | Scan() | |
875 | : issued_non_pic_error_(false) | |
876 | { } | |
877 | ||
95a2c8d6 RS |
878 | static inline int |
879 | get_reference_flags(unsigned int r_type); | |
880 | ||
2e30d253 | 881 | inline void |
ad0f2072 | 882 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 883 | Sized_relobj_file<size, false>* object, |
2e30d253 | 884 | unsigned int data_shndx, |
07f397ab | 885 | Output_section* output_section, |
fc51264f | 886 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
887 | const elfcpp::Sym<size, false>& lsym, |
888 | bool is_discarded); | |
2e30d253 ILT |
889 | |
890 | inline void | |
ad0f2072 | 891 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 892 | Sized_relobj_file<size, false>* object, |
2e30d253 | 893 | unsigned int data_shndx, |
07f397ab | 894 | Output_section* output_section, |
fc51264f | 895 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
2e30d253 | 896 | Symbol* gsym); |
e041f13d | 897 | |
21bb3914 ST |
898 | inline bool |
899 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
900 | Target_x86_64* target, | |
2e702c99 RM |
901 | Sized_relobj_file<size, false>* object, |
902 | unsigned int data_shndx, | |
903 | Output_section* output_section, | |
904 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 905 | unsigned int r_type, |
2e702c99 | 906 | const elfcpp::Sym<size, false>& lsym); |
21bb3914 ST |
907 | |
908 | inline bool | |
909 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
2e702c99 RM |
910 | Target_x86_64* target, |
911 | Sized_relobj_file<size, false>* object, | |
912 | unsigned int data_shndx, | |
913 | Output_section* output_section, | |
914 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 915 | unsigned int r_type, |
2e702c99 | 916 | Symbol* gsym); |
21bb3914 | 917 | |
a036edd8 | 918 | private: |
e041f13d | 919 | static void |
fc51264f L |
920 | unsupported_reloc_local(Sized_relobj_file<size, false>*, |
921 | unsigned int r_type); | |
e041f13d ILT |
922 | |
923 | static void | |
fc51264f L |
924 | unsupported_reloc_global(Sized_relobj_file<size, false>*, |
925 | unsigned int r_type, Symbol*); | |
a036edd8 ILT |
926 | |
927 | void | |
a29b0dad | 928 | check_non_pic(Relobj*, unsigned int r_type, Symbol*); |
a036edd8 | 929 | |
21bb3914 | 930 | inline bool |
4aebb631 RC |
931 | possible_function_pointer_reloc(Sized_relobj_file<size, false>* src_obj, |
932 | unsigned int src_indx, | |
933 | unsigned int r_offset, | |
934 | unsigned int r_type); | |
21bb3914 | 935 | |
7223e9ca | 936 | bool |
fc51264f | 937 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*, |
6fa2a40b | 938 | unsigned int r_type); |
7223e9ca | 939 | |
a036edd8 ILT |
940 | // Whether we have issued an error about a non-PIC compilation. |
941 | bool issued_non_pic_error_; | |
2e30d253 ILT |
942 | }; |
943 | ||
944 | // The class which implements relocation. | |
945 | class Relocate | |
946 | { | |
947 | public: | |
948 | Relocate() | |
36171d64 | 949 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
950 | { } |
951 | ||
952 | ~Relocate() | |
953 | { | |
954 | if (this->skip_call_tls_get_addr_) | |
955 | { | |
956 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 957 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
958 | } |
959 | } | |
960 | ||
961 | // Do a relocation. Return false if the caller should not issue | |
962 | // any warnings about this relocation. | |
963 | inline bool | |
91a65d2f AM |
964 | relocate(const Relocate_info<size, false>*, unsigned int, |
965 | Target_x86_64*, Output_section*, size_t, const unsigned char*, | |
966 | const Sized_symbol<size>*, const Symbol_value<size>*, | |
fc51264f | 967 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 968 | section_size_type); |
2e30d253 ILT |
969 | |
970 | private: | |
971 | // Do a TLS relocation. | |
972 | inline void | |
fc51264f | 973 | relocate_tls(const Relocate_info<size, false>*, Target_x86_64*, |
2e702c99 | 974 | size_t relnum, const elfcpp::Rela<size, false>&, |
fc51264f L |
975 | unsigned int r_type, const Sized_symbol<size>*, |
976 | const Symbol_value<size>*, | |
977 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 978 | section_size_type); |
2e30d253 | 979 | |
c2b45e22 | 980 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 | 981 | inline void |
fc51264f | 982 | tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
fc51264f L |
983 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
984 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
7bf1f802 | 985 | unsigned char* view, |
fc51264f | 986 | typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 987 | section_size_type view_size); |
7bf1f802 | 988 | |
56622147 ILT |
989 | // Do a TLS General-Dynamic to Local-Exec transition. |
990 | inline void | |
fc51264f | 991 | tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 992 | Output_segment* tls_segment, |
fc51264f L |
993 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
994 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 995 | unsigned char* view, |
fe8718a4 | 996 | section_size_type view_size); |
2e30d253 | 997 | |
c2b45e22 CC |
998 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
999 | inline void | |
fc51264f | 1000 | tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
fc51264f L |
1001 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1002 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 | 1003 | unsigned char* view, |
fc51264f | 1004 | typename elfcpp::Elf_types<size>::Elf_Addr, |
c2b45e22 CC |
1005 | section_size_type view_size); |
1006 | ||
1007 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
1008 | inline void | |
fc51264f | 1009 | tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 1010 | Output_segment* tls_segment, |
fc51264f L |
1011 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1012 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 CC |
1013 | unsigned char* view, |
1014 | section_size_type view_size); | |
1015 | ||
56622147 | 1016 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 1017 | inline void |
fc51264f | 1018 | tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 1019 | Output_segment* tls_segment, |
fc51264f L |
1020 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1021 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 1022 | unsigned char* view, |
fe8718a4 | 1023 | section_size_type view_size); |
2e30d253 | 1024 | |
56622147 ILT |
1025 | // Do a TLS Initial-Exec to Local-Exec transition. |
1026 | static inline void | |
fc51264f | 1027 | tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum, |
72ec2876 | 1028 | Output_segment* tls_segment, |
fc51264f L |
1029 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
1030 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
72ec2876 | 1031 | unsigned char* view, |
fe8718a4 | 1032 | section_size_type view_size); |
2e30d253 ILT |
1033 | |
1034 | // This is set if we should skip the next reloc, which should be a | |
1035 | // PLT32 reloc against ___tls_get_addr. | |
1036 | bool skip_call_tls_get_addr_; | |
1037 | }; | |
1038 | ||
1fa29f10 IT |
1039 | // Check if relocation against this symbol is a candidate for |
1040 | // conversion from | |
1041 | // mov foo@GOTPCREL(%rip), %reg | |
1042 | // to lea foo(%rip), %reg. | |
3a4f096e ST |
1043 | template<class View_type> |
1044 | static inline bool | |
1045 | can_convert_mov_to_lea(const Symbol* gsym, unsigned int r_type, | |
1046 | size_t r_offset, View_type* view) | |
1fa29f10 IT |
1047 | { |
1048 | gold_assert(gsym != NULL); | |
3a4f096e ST |
1049 | // We cannot do the conversion unless it's one of these relocations. |
1050 | if (r_type != elfcpp::R_X86_64_GOTPCREL | |
1051 | && r_type != elfcpp::R_X86_64_GOTPCRELX | |
1052 | && r_type != elfcpp::R_X86_64_REX_GOTPCRELX) | |
1053 | return false; | |
1054 | // We cannot convert references to IFUNC symbols, or to symbols that | |
1055 | // are not local to the current module. | |
ed35cc4a CC |
1056 | // We can't do predefined symbols because they may become undefined |
1057 | // (e.g., __ehdr_start when the headers aren't mapped to a segment). | |
3a4f096e | 1058 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
ed35cc4a CC |
1059 | || gsym->is_undefined() |
1060 | || gsym->is_predefined() | |
3a4f096e ST |
1061 | || gsym->is_from_dynobj() |
1062 | || gsym->is_preemptible()) | |
1063 | return false; | |
1064 | // If we are building a shared object and the symbol is protected, we may | |
1065 | // need to go through the GOT. | |
1066 | if (parameters->options().shared() | |
1067 | && gsym->visibility() == elfcpp::STV_PROTECTED) | |
1068 | return false; | |
1069 | // We cannot convert references to the _DYNAMIC symbol. | |
1070 | if (strcmp(gsym->name(), "_DYNAMIC") == 0) | |
1071 | return false; | |
1072 | // Check for a MOV opcode. | |
1073 | return (*view)[r_offset - 2] == 0x8b; | |
1074 | } | |
1075 | ||
1076 | // Convert | |
1077 | // callq *foo@GOTPCRELX(%rip) to | |
1078 | // addr32 callq foo | |
1079 | // and jmpq *foo@GOTPCRELX(%rip) to | |
1080 | // jmpq foo | |
1081 | // nop | |
1082 | template<class View_type> | |
1083 | static inline bool | |
1084 | can_convert_callq_to_direct(const Symbol* gsym, unsigned int r_type, | |
1085 | size_t r_offset, View_type* view) | |
1086 | { | |
1087 | gold_assert(gsym != NULL); | |
1088 | // We cannot do the conversion unless it's a GOTPCRELX relocation. | |
1089 | if (r_type != elfcpp::R_X86_64_GOTPCRELX) | |
1090 | return false; | |
1091 | // We cannot convert references to IFUNC symbols, or to symbols that | |
1092 | // are not local to the current module. | |
1093 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1094 | || gsym->is_undefined () | |
1095 | || gsym->is_from_dynobj() | |
1096 | || gsym->is_preemptible()) | |
1097 | return false; | |
1098 | // Check for a CALLQ or JMPQ opcode. | |
1099 | return ((*view)[r_offset - 2] == 0xff | |
1100 | && ((*view)[r_offset - 1] == 0x15 | |
1101 | || (*view)[r_offset - 1] == 0x25)); | |
1fa29f10 IT |
1102 | } |
1103 | ||
2e30d253 ILT |
1104 | // Adjust TLS relocation type based on the options and whether this |
1105 | // is a local symbol. | |
e041f13d | 1106 | static tls::Tls_optimization |
2e30d253 ILT |
1107 | optimize_tls_reloc(bool is_final, int r_type); |
1108 | ||
1109 | // Get the GOT section, creating it if necessary. | |
1110 | Output_data_got<64, false>* | |
1111 | got_section(Symbol_table*, Layout*); | |
1112 | ||
96f2030e | 1113 | // Get the GOT PLT section. |
57b2284c | 1114 | Output_data_got_plt_x86_64* |
96f2030e ILT |
1115 | got_plt_section() const |
1116 | { | |
1117 | gold_assert(this->got_plt_ != NULL); | |
1118 | return this->got_plt_; | |
1119 | } | |
1120 | ||
a8df5856 ILT |
1121 | // Get the GOT section for TLSDESC entries. |
1122 | Output_data_got<64, false>* | |
1123 | got_tlsdesc_section() const | |
1124 | { | |
1125 | gold_assert(this->got_tlsdesc_ != NULL); | |
1126 | return this->got_tlsdesc_; | |
1127 | } | |
1128 | ||
c2b45e22 CC |
1129 | // Create the PLT section. |
1130 | void | |
1131 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
1132 | ||
2e30d253 ILT |
1133 | // Create a PLT entry for a global symbol. |
1134 | void | |
1135 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
1136 | ||
7223e9ca ILT |
1137 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
1138 | void | |
1139 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
fc51264f | 1140 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
1141 | unsigned int local_sym_index); |
1142 | ||
9fa33bee | 1143 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
1144 | void |
1145 | define_tls_base_symbol(Symbol_table*, Layout*); | |
1146 | ||
c2b45e22 CC |
1147 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1148 | void | |
1149 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
1150 | ||
31d60480 ILT |
1151 | // Create a GOT entry for the TLS module index. |
1152 | unsigned int | |
1153 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
fc51264f | 1154 | Sized_relobj_file<size, false>* object); |
31d60480 | 1155 | |
2e30d253 | 1156 | // Get the PLT section. |
fc51264f | 1157 | Output_data_plt_x86_64<size>* |
2e30d253 ILT |
1158 | plt_section() const |
1159 | { | |
1160 | gold_assert(this->plt_ != NULL); | |
1161 | return this->plt_; | |
1162 | } | |
1163 | ||
1164 | // Get the dynamic reloc section, creating it if necessary. | |
1165 | Reloc_section* | |
0ffd9845 | 1166 | rela_dyn_section(Layout*); |
2e30d253 | 1167 | |
e291e7b9 ILT |
1168 | // Get the section to use for TLSDESC relocations. |
1169 | Reloc_section* | |
1170 | rela_tlsdesc_section(Layout*) const; | |
1171 | ||
67181c72 ILT |
1172 | // Get the section to use for IRELATIVE relocations. |
1173 | Reloc_section* | |
1174 | rela_irelative_section(Layout*); | |
1175 | ||
12c0daef | 1176 | // Add a potential copy relocation. |
2e30d253 | 1177 | void |
ef9beddf | 1178 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 1179 | Sized_relobj_file<size, false>* object, |
12c0daef | 1180 | unsigned int shndx, Output_section* output_section, |
fc51264f | 1181 | Symbol* sym, const elfcpp::Rela<size, false>& reloc) |
12c0daef | 1182 | { |
859d7987 | 1183 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
12c0daef | 1184 | this->copy_relocs_.copy_reloc(symtab, layout, |
fc51264f | 1185 | symtab->get_sized_symbol<size>(sym), |
12c0daef | 1186 | object, shndx, output_section, |
859d7987 CC |
1187 | r_type, reloc.get_r_offset(), |
1188 | reloc.get_r_addend(), | |
1189 | this->rela_dyn_section(layout)); | |
12c0daef | 1190 | } |
2e30d253 | 1191 | |
a2575bec | 1192 | // Record a target-specific program property in the .note.gnu.property |
6c04fd9b CC |
1193 | // section. |
1194 | void | |
a2575bec CC |
1195 | record_gnu_property(int, int, size_t, const unsigned char*, const Object*); |
1196 | ||
1197 | // Merge the target-specific program properties from the current object. | |
1198 | void | |
1199 | merge_gnu_properties(const Object*); | |
1200 | ||
1201 | // Finalize the target-specific program properties and add them back to | |
1202 | // the layout. | |
1203 | void | |
1204 | do_finalize_gnu_properties(Layout*) const; | |
6c04fd9b | 1205 | |
2e30d253 ILT |
1206 | // Information about this specific target which we pass to the |
1207 | // general Target structure. | |
1208 | static const Target::Target_info x86_64_info; | |
1209 | ||
0e70b911 CC |
1210 | // The types of GOT entries needed for this platform. |
1211 | // These values are exposed to the ABI in an incremental link. | |
1212 | // Do not renumber existing values without changing the version | |
1213 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
1214 | enum Got_type |
1215 | { | |
1216 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
1217 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
1218 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
1219 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
1220 | }; | |
1221 | ||
e291e7b9 ILT |
1222 | // This type is used as the argument to the target specific |
1223 | // relocation routines. The only target specific reloc is | |
1224 | // R_X86_64_TLSDESC against a local symbol. | |
1225 | struct Tlsdesc_info | |
1226 | { | |
fc51264f | 1227 | Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym) |
e291e7b9 ILT |
1228 | : object(a_object), r_sym(a_r_sym) |
1229 | { } | |
1230 | ||
1231 | // The object in which the local symbol is defined. | |
fc51264f | 1232 | Sized_relobj_file<size, false>* object; |
e291e7b9 ILT |
1233 | // The local symbol index in the object. |
1234 | unsigned int r_sym; | |
1235 | }; | |
1236 | ||
2e30d253 ILT |
1237 | // The GOT section. |
1238 | Output_data_got<64, false>* got_; | |
1239 | // The PLT section. | |
fc51264f | 1240 | Output_data_plt_x86_64<size>* plt_; |
2e30d253 | 1241 | // The GOT PLT section. |
57b2284c | 1242 | Output_data_got_plt_x86_64* got_plt_; |
67181c72 ILT |
1243 | // The GOT section for IRELATIVE relocations. |
1244 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
1245 | // The GOT section for TLSDESC relocations. |
1246 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
1247 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
1248 | Symbol* global_offset_table_; | |
2e30d253 | 1249 | // The dynamic reloc section. |
0ffd9845 | 1250 | Reloc_section* rela_dyn_; |
67181c72 ILT |
1251 | // The section to use for IRELATIVE relocs. |
1252 | Reloc_section* rela_irelative_; | |
2e30d253 | 1253 | // Relocs saved to avoid a COPY reloc. |
fc51264f | 1254 | Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_; |
c2b45e22 | 1255 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 1256 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
1257 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
1258 | // specific relocation. Here we store the object and local symbol | |
1259 | // index for the relocation. | |
1260 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
1261 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
1262 | bool tls_base_symbol_defined_; | |
a2575bec CC |
1263 | // Target-specific program properties, from .note.gnu.property section. |
1264 | // Each bit represents a specific feature. | |
1265 | uint32_t isa_1_used_; | |
1266 | uint32_t isa_1_needed_; | |
1267 | uint32_t feature_1_; | |
1268 | // Target-specific properties from the current object. | |
1269 | // These bits get ANDed into FEATURE_1_ after all properties for the object | |
1270 | // have been processed. | |
1271 | uint32_t object_feature_1_; | |
1272 | // Whether we have seen our first object, for use in initializing FEATURE_1_. | |
1273 | bool seen_first_object_; | |
2e30d253 ILT |
1274 | }; |
1275 | ||
fc51264f L |
1276 | template<> |
1277 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
1278 | { |
1279 | 64, // size | |
1280 | false, // is_big_endian | |
1281 | elfcpp::EM_X86_64, // machine_code | |
1282 | false, // has_make_symbol | |
1283 | false, // has_resolve | |
1284 | true, // has_code_fill | |
35cdfc9a | 1285 | true, // is_default_stack_executable |
b3ce541e | 1286 | true, // can_icf_inline_merge_sections |
0864d551 | 1287 | '\0', // wrap_char |
2e30d253 | 1288 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 1289 | 0x400000, // default_text_segment_address |
cd72c291 | 1290 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 1291 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
1292 | false, // isolate_execinstr |
1293 | 0, // rosegment_gap | |
8a5e3e08 ILT |
1294 | elfcpp::SHN_UNDEF, // small_common_shndx |
1295 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1296 | 0, // small_common_section_flags | |
05a352e6 DK |
1297 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
1298 | NULL, // attributes_section | |
a67858e0 | 1299 | NULL, // attributes_vendor |
8d9743bd MK |
1300 | "_start", // entry_symbol_name |
1301 | 32, // hash_entry_size | |
bce5a025 | 1302 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
2e30d253 ILT |
1303 | }; |
1304 | ||
fc51264f L |
1305 | template<> |
1306 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
1307 | { | |
1308 | 32, // size | |
1309 | false, // is_big_endian | |
1310 | elfcpp::EM_X86_64, // machine_code | |
1311 | false, // has_make_symbol | |
1312 | false, // has_resolve | |
1313 | true, // has_code_fill | |
1314 | true, // is_default_stack_executable | |
1315 | true, // can_icf_inline_merge_sections | |
1316 | '\0', // wrap_char | |
1317 | "/libx32/ldx32.so.1", // program interpreter | |
1318 | 0x400000, // default_text_segment_address | |
1319 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
1320 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2e702c99 RM |
1321 | false, // isolate_execinstr |
1322 | 0, // rosegment_gap | |
fc51264f L |
1323 | elfcpp::SHN_UNDEF, // small_common_shndx |
1324 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1325 | 0, // small_common_section_flags | |
1326 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
1327 | NULL, // attributes_section | |
a67858e0 | 1328 | NULL, // attributes_vendor |
8d9743bd MK |
1329 | "_start", // entry_symbol_name |
1330 | 32, // hash_entry_size | |
bce5a025 | 1331 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
fc51264f L |
1332 | }; |
1333 | ||
8a5e3e08 ILT |
1334 | // This is called when a new output section is created. This is where |
1335 | // we handle the SHF_X86_64_LARGE. | |
1336 | ||
fc51264f | 1337 | template<int size> |
8a5e3e08 | 1338 | void |
fc51264f | 1339 | Target_x86_64<size>::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
1340 | { |
1341 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
1342 | os->set_is_large_section(); | |
1343 | } | |
1344 | ||
2e30d253 ILT |
1345 | // Get the GOT section, creating it if necessary. |
1346 | ||
fc51264f | 1347 | template<int size> |
2e30d253 | 1348 | Output_data_got<64, false>* |
fc51264f | 1349 | Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout) |
2e30d253 ILT |
1350 | { |
1351 | if (this->got_ == NULL) | |
1352 | { | |
1353 | gold_assert(symtab != NULL && layout != NULL); | |
1354 | ||
9446efde ILT |
1355 | // When using -z now, we can treat .got.plt as a relro section. |
1356 | // Without -z now, it is modified after program startup by lazy | |
1357 | // PLT relocations. | |
1358 | bool is_got_plt_relro = parameters->options().now(); | |
1359 | Output_section_order got_order = (is_got_plt_relro | |
1360 | ? ORDER_RELRO | |
1361 | : ORDER_RELRO_LAST); | |
1362 | Output_section_order got_plt_order = (is_got_plt_relro | |
1363 | ? ORDER_RELRO | |
1364 | : ORDER_NON_RELRO_FIRST); | |
1365 | ||
2e30d253 ILT |
1366 | this->got_ = new Output_data_got<64, false>(); |
1367 | ||
82742395 ILT |
1368 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
1369 | (elfcpp::SHF_ALLOC | |
1370 | | elfcpp::SHF_WRITE), | |
9446efde | 1371 | this->got_, got_order, true); |
2e30d253 | 1372 | |
57b2284c | 1373 | this->got_plt_ = new Output_data_got_plt_x86_64(layout); |
82742395 ILT |
1374 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1375 | (elfcpp::SHF_ALLOC | |
1376 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
1377 | this->got_plt_, got_plt_order, |
1378 | is_got_plt_relro); | |
2e30d253 ILT |
1379 | |
1380 | // The first three entries are reserved. | |
27bc2bce | 1381 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 1382 | |
9446efde ILT |
1383 | if (!is_got_plt_relro) |
1384 | { | |
1385 | // Those bytes can go into the relro segment. | |
1386 | layout->increase_relro(3 * 8); | |
1387 | } | |
1a2dff53 | 1388 | |
2e30d253 | 1389 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
1390 | this->global_offset_table_ = |
1391 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1392 | Symbol_table::PREDEFINED, | |
1393 | this->got_plt_, | |
1394 | 0, 0, elfcpp::STT_OBJECT, | |
1395 | elfcpp::STB_LOCAL, | |
1396 | elfcpp::STV_HIDDEN, 0, | |
1397 | false, false); | |
a8df5856 | 1398 | |
67181c72 ILT |
1399 | // If there are any IRELATIVE relocations, they get GOT entries |
1400 | // in .got.plt after the jump slot entries. | |
1401 | this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT"); | |
1402 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1403 | (elfcpp::SHF_ALLOC | |
1404 | | elfcpp::SHF_WRITE), | |
1405 | this->got_irelative_, | |
9446efde | 1406 | got_plt_order, is_got_plt_relro); |
67181c72 | 1407 | |
a8df5856 | 1408 | // If there are any TLSDESC relocations, they get GOT entries in |
67181c72 | 1409 | // .got.plt after the jump slot and IRELATIVE entries. |
a8df5856 ILT |
1410 | this->got_tlsdesc_ = new Output_data_got<64, false>(); |
1411 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1412 | (elfcpp::SHF_ALLOC | |
1413 | | elfcpp::SHF_WRITE), | |
22f0da72 | 1414 | this->got_tlsdesc_, |
9446efde | 1415 | got_plt_order, is_got_plt_relro); |
2e30d253 ILT |
1416 | } |
1417 | ||
1418 | return this->got_; | |
1419 | } | |
1420 | ||
1421 | // Get the dynamic reloc section, creating it if necessary. | |
1422 | ||
fc51264f L |
1423 | template<int size> |
1424 | typename Target_x86_64<size>::Reloc_section* | |
1425 | Target_x86_64<size>::rela_dyn_section(Layout* layout) | |
2e30d253 | 1426 | { |
0ffd9845 | 1427 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
1428 | { |
1429 | gold_assert(layout != NULL); | |
d98bc257 | 1430 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 1431 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
1432 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
1433 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 1434 | } |
0ffd9845 | 1435 | return this->rela_dyn_; |
2e30d253 ILT |
1436 | } |
1437 | ||
67181c72 ILT |
1438 | // Get the section to use for IRELATIVE relocs, creating it if |
1439 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
1440 | // relocations. They need to follow the other dynamic relocations so | |
1441 | // that they can refer to global variables initialized by those | |
1442 | // relocs. | |
1443 | ||
fc51264f L |
1444 | template<int size> |
1445 | typename Target_x86_64<size>::Reloc_section* | |
1446 | Target_x86_64<size>::rela_irelative_section(Layout* layout) | |
67181c72 ILT |
1447 | { |
1448 | if (this->rela_irelative_ == NULL) | |
1449 | { | |
1450 | // Make sure we have already created the dynamic reloc section. | |
1451 | this->rela_dyn_section(layout); | |
1452 | this->rela_irelative_ = new Reloc_section(false); | |
1453 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
1454 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
1455 | ORDER_DYNAMIC_RELOCS, false); | |
1456 | gold_assert(this->rela_dyn_->output_section() | |
1457 | == this->rela_irelative_->output_section()); | |
1458 | } | |
1459 | return this->rela_irelative_; | |
1460 | } | |
1461 | ||
a2575bec | 1462 | // Record a target-specific program property from the .note.gnu.property |
6c04fd9b CC |
1463 | // section. |
1464 | template<int size> | |
1465 | void | |
a2575bec | 1466 | Target_x86_64<size>::record_gnu_property( |
6c04fd9b | 1467 | int, int pr_type, |
a2575bec CC |
1468 | size_t pr_datasz, const unsigned char* pr_data, |
1469 | const Object* object) | |
6c04fd9b | 1470 | { |
a2575bec CC |
1471 | uint32_t val; |
1472 | ||
6c04fd9b CC |
1473 | switch (pr_type) |
1474 | { | |
1475 | case elfcpp::GNU_PROPERTY_X86_ISA_1_USED: | |
1476 | case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED: | |
6c04fd9b | 1477 | case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND: |
a2575bec CC |
1478 | if (pr_datasz != 4) |
1479 | { | |
1480 | gold_warning(_("%s: corrupt .note.gnu.property section " | |
1481 | "(pr_datasz for property %d is not 4)"), | |
1482 | object->name().c_str(), pr_type); | |
1483 | return; | |
1484 | } | |
1485 | val = elfcpp::Swap<32, false>::readval(pr_data); | |
6c04fd9b CC |
1486 | break; |
1487 | default: | |
a2575bec CC |
1488 | gold_warning(_("%s: unknown program property type 0x%x " |
1489 | "in .note.gnu.property section"), | |
1490 | object->name().c_str(), pr_type); | |
6c04fd9b CC |
1491 | break; |
1492 | } | |
a2575bec CC |
1493 | |
1494 | switch (pr_type) | |
1495 | { | |
1496 | case elfcpp::GNU_PROPERTY_X86_ISA_1_USED: | |
1497 | this->isa_1_used_ |= val; | |
1498 | break; | |
1499 | case elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED: | |
1500 | this->isa_1_needed_ |= val; | |
1501 | break; | |
1502 | case elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND: | |
1503 | // If we see multiple feature props in one object, OR them together. | |
1504 | this->object_feature_1_ |= val; | |
1505 | break; | |
1506 | } | |
1507 | } | |
1508 | ||
1509 | // Merge the target-specific program properties from the current object. | |
1510 | template<int size> | |
1511 | void | |
1512 | Target_x86_64<size>::merge_gnu_properties(const Object*) | |
1513 | { | |
1514 | if (this->seen_first_object_) | |
1515 | this->feature_1_ &= this->object_feature_1_; | |
1516 | else | |
1517 | { | |
1518 | this->feature_1_ = this->object_feature_1_; | |
1519 | this->seen_first_object_ = true; | |
1520 | } | |
1521 | this->object_feature_1_ = 0; | |
1522 | } | |
1523 | ||
1524 | static inline void | |
1525 | add_property(Layout* layout, unsigned int pr_type, uint32_t val) | |
1526 | { | |
1527 | unsigned char buf[4]; | |
1528 | elfcpp::Swap<32, false>::writeval(buf, val); | |
1529 | layout->add_gnu_property(elfcpp::NT_GNU_PROPERTY_TYPE_0, pr_type, 4, buf); | |
1530 | } | |
1531 | ||
1532 | // Finalize the target-specific program properties and add them back to | |
1533 | // the layout. | |
1534 | template<int size> | |
1535 | void | |
1536 | Target_x86_64<size>::do_finalize_gnu_properties(Layout* layout) const | |
1537 | { | |
1538 | if (this->isa_1_used_ != 0) | |
1539 | add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_USED, | |
1540 | this->isa_1_used_); | |
1541 | if (this->isa_1_needed_ != 0) | |
1542 | add_property(layout, elfcpp::GNU_PROPERTY_X86_ISA_1_NEEDED, | |
1543 | this->isa_1_needed_); | |
1544 | if (this->feature_1_ != 0) | |
1545 | add_property(layout, elfcpp::GNU_PROPERTY_X86_FEATURE_1_AND, | |
1546 | this->feature_1_); | |
6c04fd9b CC |
1547 | } |
1548 | ||
57b2284c CC |
1549 | // Write the first three reserved words of the .got.plt section. |
1550 | // The remainder of the section is written while writing the PLT | |
1551 | // in Output_data_plt_i386::do_write. | |
1552 | ||
1553 | void | |
1554 | Output_data_got_plt_x86_64::do_write(Output_file* of) | |
1555 | { | |
1556 | // The first entry in the GOT is the address of the .dynamic section | |
1557 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1558 | // We saved space for them when we created the section in | |
1559 | // Target_x86_64::got_section. | |
1560 | const off_t got_file_offset = this->offset(); | |
1561 | gold_assert(this->data_size() >= 24); | |
1562 | unsigned char* const got_view = of->get_output_view(got_file_offset, 24); | |
1563 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1564 | uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1565 | elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr); | |
1566 | memset(got_view + 8, 0, 16); | |
1567 | of->write_output_view(got_file_offset, 24, got_view); | |
1568 | } | |
1569 | ||
4829d394 | 1570 | // Initialize the PLT section. |
2e30d253 | 1571 | |
fc51264f | 1572 | template<int size> |
4829d394 | 1573 | void |
fc51264f | 1574 | Output_data_plt_x86_64<size>::init(Layout* layout) |
2e30d253 | 1575 | { |
d98bc257 | 1576 | this->rel_ = new Reloc_section(false); |
2e30d253 | 1577 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
1578 | elfcpp::SHF_ALLOC, this->rel_, |
1579 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2e30d253 ILT |
1580 | } |
1581 | ||
fc51264f | 1582 | template<int size> |
2e30d253 | 1583 | void |
fc51264f | 1584 | Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os) |
2e30d253 | 1585 | { |
2e702c99 | 1586 | os->set_entsize(this->get_plt_entry_size()); |
2e30d253 ILT |
1587 | } |
1588 | ||
1589 | // Add an entry to the PLT. | |
1590 | ||
fc51264f | 1591 | template<int size> |
2e30d253 | 1592 | void |
fc51264f L |
1593 | Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout, |
1594 | Symbol* gsym) | |
2e30d253 ILT |
1595 | { |
1596 | gold_assert(!gsym->has_plt_offset()); | |
1597 | ||
4829d394 CC |
1598 | unsigned int plt_index; |
1599 | off_t plt_offset; | |
1600 | section_offset_type got_offset; | |
2e30d253 | 1601 | |
67181c72 ILT |
1602 | unsigned int* pcount; |
1603 | unsigned int offset; | |
1604 | unsigned int reserved; | |
57b2284c | 1605 | Output_section_data_build* got; |
67181c72 ILT |
1606 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1607 | && gsym->can_use_relative_reloc(false)) | |
1608 | { | |
1609 | pcount = &this->irelative_count_; | |
1610 | offset = 0; | |
1611 | reserved = 0; | |
1612 | got = this->got_irelative_; | |
1613 | } | |
1614 | else | |
1615 | { | |
1616 | pcount = &this->count_; | |
1617 | offset = 1; | |
1618 | reserved = 3; | |
1619 | got = this->got_plt_; | |
1620 | } | |
1621 | ||
4829d394 CC |
1622 | if (!this->is_data_size_valid()) |
1623 | { | |
67181c72 ILT |
1624 | // Note that when setting the PLT offset for a non-IRELATIVE |
1625 | // entry we skip the initial reserved PLT entry. | |
1626 | plt_index = *pcount + offset; | |
2e702c99 | 1627 | plt_offset = plt_index * this->get_plt_entry_size(); |
2e30d253 | 1628 | |
67181c72 | 1629 | ++*pcount; |
2e30d253 | 1630 | |
67181c72 ILT |
1631 | got_offset = (plt_index - offset + reserved) * 8; |
1632 | gold_assert(got_offset == got->current_data_size()); | |
2e30d253 | 1633 | |
4829d394 CC |
1634 | // Every PLT entry needs a GOT entry which points back to the PLT |
1635 | // entry (this will be changed by the dynamic linker, normally | |
1636 | // lazily when the function is called). | |
67181c72 | 1637 | got->set_current_data_size(got_offset + 8); |
4829d394 | 1638 | } |
7223e9ca ILT |
1639 | else |
1640 | { | |
67181c72 ILT |
1641 | // FIXME: This is probably not correct for IRELATIVE relocs. |
1642 | ||
4829d394 | 1643 | // For incremental updates, find an available slot. |
2e702c99 RM |
1644 | plt_offset = this->free_list_.allocate(this->get_plt_entry_size(), |
1645 | this->get_plt_entry_size(), 0); | |
4829d394 | 1646 | if (plt_offset == -1) |
e6455dfb CC |
1647 | gold_fallback(_("out of patch space (PLT);" |
1648 | " relink with --incremental-full")); | |
4829d394 CC |
1649 | |
1650 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
1651 | // can be calculated from the PLT index, adjusting for the three | |
1652 | // reserved entries at the beginning of the GOT. | |
2e702c99 | 1653 | plt_index = plt_offset / this->get_plt_entry_size() - 1; |
67181c72 | 1654 | got_offset = (plt_index - offset + reserved) * 8; |
7223e9ca | 1655 | } |
2e30d253 | 1656 | |
4829d394 CC |
1657 | gsym->set_plt_offset(plt_offset); |
1658 | ||
1659 | // Every PLT entry needs a reloc. | |
67181c72 | 1660 | this->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 | 1661 | |
2e30d253 ILT |
1662 | // Note that we don't need to save the symbol. The contents of the |
1663 | // PLT are independent of which symbols are used. The symbols only | |
1664 | // appear in the relocations. | |
1665 | } | |
1666 | ||
7223e9ca ILT |
1667 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1668 | // the PLT offset. | |
1669 | ||
fc51264f | 1670 | template<int size> |
7223e9ca | 1671 | unsigned int |
fc51264f | 1672 | Output_data_plt_x86_64<size>::add_local_ifunc_entry( |
67181c72 ILT |
1673 | Symbol_table* symtab, |
1674 | Layout* layout, | |
fc51264f | 1675 | Sized_relobj_file<size, false>* relobj, |
6fa2a40b | 1676 | unsigned int local_sym_index) |
7223e9ca | 1677 | { |
2e702c99 | 1678 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1679 | ++this->irelative_count_; |
7223e9ca | 1680 | |
67181c72 | 1681 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1682 | |
1683 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1684 | // entry. | |
67181c72 | 1685 | this->got_irelative_->set_current_data_size(got_offset + 8); |
7223e9ca ILT |
1686 | |
1687 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1688 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
1689 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
1690 | elfcpp::R_X86_64_IRELATIVE, | |
1691 | this->got_irelative_, got_offset, 0); | |
7223e9ca ILT |
1692 | |
1693 | return plt_offset; | |
1694 | } | |
1695 | ||
4829d394 CC |
1696 | // Add the relocation for a PLT entry. |
1697 | ||
fc51264f | 1698 | template<int size> |
4829d394 | 1699 | void |
fc51264f L |
1700 | Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab, |
1701 | Layout* layout, | |
1702 | Symbol* gsym, | |
1703 | unsigned int got_offset) | |
4829d394 CC |
1704 | { |
1705 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1706 | && gsym->can_use_relative_reloc(false)) | |
67181c72 ILT |
1707 | { |
1708 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
1709 | rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
1710 | this->got_irelative_, got_offset, 0); | |
1711 | } | |
4829d394 CC |
1712 | else |
1713 | { | |
1714 | gsym->set_needs_dynsym_entry(); | |
1715 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
1716 | got_offset, 0); | |
1717 | } | |
1718 | } | |
1719 | ||
e291e7b9 ILT |
1720 | // Return where the TLSDESC relocations should go, creating it if |
1721 | // necessary. These follow the JUMP_SLOT relocations. | |
1722 | ||
fc51264f L |
1723 | template<int size> |
1724 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1725 | Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout) | |
e291e7b9 ILT |
1726 | { |
1727 | if (this->tlsdesc_rel_ == NULL) | |
1728 | { | |
1729 | this->tlsdesc_rel_ = new Reloc_section(false); | |
1730 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1731 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 1732 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1733 | gold_assert(this->tlsdesc_rel_->output_section() |
1734 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1735 | } |
1736 | return this->tlsdesc_rel_; | |
1737 | } | |
1738 | ||
67181c72 ILT |
1739 | // Return where the IRELATIVE relocations should go in the PLT. These |
1740 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
1741 | ||
fc51264f L |
1742 | template<int size> |
1743 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1744 | Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab, | |
1745 | Layout* layout) | |
67181c72 ILT |
1746 | { |
1747 | if (this->irelative_rel_ == NULL) | |
1748 | { | |
1749 | // Make sure we have a place for the TLSDESC relocations, in | |
1750 | // case we see any later on. | |
1751 | this->rela_tlsdesc(layout); | |
1752 | this->irelative_rel_ = new Reloc_section(false); | |
1753 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1754 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1755 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1756 | gold_assert(this->irelative_rel_->output_section() | |
1757 | == this->rel_->output_section()); | |
1758 | ||
1759 | if (parameters->doing_static_link()) | |
1760 | { | |
1761 | // A statically linked executable will only have a .rela.plt | |
1762 | // section to hold R_X86_64_IRELATIVE relocs for | |
1763 | // STT_GNU_IFUNC symbols. The library will use these | |
1764 | // symbols to locate the IRELATIVE relocs at program startup | |
1765 | // time. | |
1766 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
1767 | Symbol_table::PREDEFINED, | |
1768 | this->irelative_rel_, 0, 0, | |
1769 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1770 | elfcpp::STV_HIDDEN, 0, false, true); | |
1771 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
1772 | Symbol_table::PREDEFINED, | |
1773 | this->irelative_rel_, 0, 0, | |
1774 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1775 | elfcpp::STV_HIDDEN, 0, true, true); | |
1776 | } | |
1777 | } | |
1778 | return this->irelative_rel_; | |
1779 | } | |
1780 | ||
1781 | // Return the PLT address to use for a global symbol. | |
1782 | ||
fc51264f | 1783 | template<int size> |
67181c72 | 1784 | uint64_t |
7a0c0a14 | 1785 | Output_data_plt_x86_64<size>::do_address_for_global(const Symbol* gsym) |
67181c72 ILT |
1786 | { |
1787 | uint64_t offset = 0; | |
1788 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1789 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1790 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1791 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1792 | } |
1793 | ||
1794 | // Return the PLT address to use for a local symbol. These are always | |
1795 | // IRELATIVE relocs. | |
1796 | ||
fc51264f | 1797 | template<int size> |
67181c72 | 1798 | uint64_t |
7a0c0a14 CC |
1799 | Output_data_plt_x86_64<size>::do_address_for_local(const Relobj* object, |
1800 | unsigned int r_sym) | |
67181c72 | 1801 | { |
19fec8c1 AM |
1802 | return (this->address() |
1803 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1804 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1805 | } |
1806 | ||
c2b45e22 | 1807 | // Set the final size. |
fc51264f | 1808 | template<int size> |
c2b45e22 | 1809 | void |
fc51264f | 1810 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1811 | { |
7a0c0a14 CC |
1812 | // Number of regular and IFUNC PLT entries, plus the first entry. |
1813 | unsigned int count = this->count_ + this->irelative_count_ + 1; | |
1814 | // Count the TLSDESC entry, if present. | |
c2b45e22 CC |
1815 | if (this->has_tlsdesc_entry()) |
1816 | ++count; | |
7a0c0a14 | 1817 | this->set_data_size(count * this->get_plt_entry_size()); |
c2b45e22 CC |
1818 | } |
1819 | ||
2e30d253 ILT |
1820 | // The first entry in the PLT for an executable. |
1821 | ||
fc51264f L |
1822 | template<int size> |
1823 | const unsigned char | |
2e702c99 | 1824 | Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] = |
2e30d253 ILT |
1825 | { |
1826 | // From AMD64 ABI Draft 0.98, page 76 | |
1827 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1828 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1829 | 0xff, 0x25, // jmp indirect |
1830 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1831 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1832 | }; | |
1833 | ||
2e702c99 RM |
1834 | template<int size> |
1835 | void | |
1836 | Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry( | |
1837 | unsigned char* pov, | |
1838 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1839 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
1840 | { | |
1841 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1842 | // We do a jmp relative to the PC at the end of this instruction. | |
1843 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1844 | (got_address + 8 | |
1845 | - (plt_address + 6))); | |
1846 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1847 | (got_address + 16 | |
1848 | - (plt_address + 12))); | |
1849 | } | |
1850 | ||
2e30d253 ILT |
1851 | // Subsequent entries in the PLT for an executable. |
1852 | ||
fc51264f L |
1853 | template<int size> |
1854 | const unsigned char | |
2e702c99 | 1855 | Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] = |
2e30d253 ILT |
1856 | { |
1857 | // From AMD64 ABI Draft 0.98, page 76 | |
1858 | 0xff, 0x25, // jmpq indirect | |
1859 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1860 | 0x68, // pushq immediate | |
1861 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1862 | 0xe9, // jmpq relative | |
1863 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1864 | }; | |
1865 | ||
2e702c99 RM |
1866 | template<int size> |
1867 | unsigned int | |
1868 | Output_data_plt_x86_64_standard<size>::do_fill_plt_entry( | |
1869 | unsigned char* pov, | |
1870 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1871 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1872 | unsigned int got_offset, | |
1873 | unsigned int plt_offset, | |
1874 | unsigned int plt_index) | |
1875 | { | |
9d585188 L |
1876 | // Check PC-relative offset overflow in PLT entry. |
1877 | uint64_t plt_got_pcrel_offset = (got_address + got_offset | |
1878 | - (plt_address + plt_offset + 6)); | |
1879 | if (Bits<32>::has_overflow(plt_got_pcrel_offset)) | |
1880 | gold_error(_("PC-relative offset overflow in PLT entry %d"), | |
1881 | plt_index + 1); | |
1882 | ||
2e702c99 RM |
1883 | memcpy(pov, plt_entry, plt_entry_size); |
1884 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
9d585188 | 1885 | plt_got_pcrel_offset); |
2e702c99 RM |
1886 | |
1887 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1888 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1889 | - (plt_offset + plt_entry_size)); | |
1890 | ||
1891 | return 6; | |
1892 | } | |
1893 | ||
c2b45e22 CC |
1894 | // The reserved TLSDESC entry in the PLT for an executable. |
1895 | ||
fc51264f L |
1896 | template<int size> |
1897 | const unsigned char | |
2e702c99 | 1898 | Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] = |
c2b45e22 CC |
1899 | { |
1900 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1901 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1902 | 0xff, 0x35, // pushq x(%rip) | |
1903 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1904 | 0xff, 0x25, // jmpq *y(%rip) | |
1905 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1906 | 0x0f, 0x1f, // nop | |
1907 | 0x40, 0 | |
1908 | }; | |
1909 | ||
2e702c99 RM |
1910 | template<int size> |
1911 | void | |
1912 | Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry( | |
1913 | unsigned char* pov, | |
1914 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1915 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1916 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
1917 | unsigned int tlsdesc_got_offset, | |
1918 | unsigned int plt_offset) | |
1919 | { | |
1920 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1921 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1922 | (got_address + 8 | |
1923 | - (plt_address + plt_offset | |
1924 | + 6))); | |
1925 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1926 | (got_base | |
1927 | + tlsdesc_got_offset | |
1928 | - (plt_address + plt_offset | |
1929 | + 12))); | |
1930 | } | |
1931 | ||
7a0c0a14 CC |
1932 | // Return the APLT address to use for a global symbol (for -z bndplt). |
1933 | ||
1934 | uint64_t | |
1935 | Output_data_plt_x86_64_bnd::do_address_for_global(const Symbol* gsym) | |
1936 | { | |
1937 | uint64_t offset = this->aplt_offset_; | |
1938 | // Convert the PLT offset into an APLT offset. | |
1939 | unsigned int plt_offset = gsym->plt_offset(); | |
1940 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1941 | && gsym->can_use_relative_reloc(false)) | |
1942 | offset += this->regular_count() * aplt_entry_size; | |
1943 | else | |
1944 | plt_offset -= plt_entry_size; | |
1945 | plt_offset = plt_offset / (plt_entry_size / aplt_entry_size); | |
1946 | return this->address() + offset + plt_offset; | |
1947 | } | |
1948 | ||
1949 | // Return the PLT address to use for a local symbol. These are always | |
1950 | // IRELATIVE relocs. | |
1951 | ||
1952 | uint64_t | |
1953 | Output_data_plt_x86_64_bnd::do_address_for_local(const Relobj* object, | |
1954 | unsigned int r_sym) | |
1955 | { | |
1956 | // Convert the PLT offset into an APLT offset. | |
1957 | unsigned int plt_offset = ((object->local_plt_offset(r_sym) - plt_entry_size) | |
1958 | / (plt_entry_size / aplt_entry_size)); | |
1959 | return (this->address() | |
1960 | + this->aplt_offset_ | |
1961 | + this->regular_count() * aplt_entry_size | |
1962 | + plt_offset); | |
1963 | } | |
1964 | ||
1965 | // Set the final size. | |
1966 | void | |
1967 | Output_data_plt_x86_64_bnd::set_final_data_size() | |
1968 | { | |
1969 | // Number of regular and IFUNC PLT entries. | |
1970 | unsigned int count = this->entry_count(); | |
1971 | // Count the first entry and the TLSDESC entry, if present. | |
1972 | unsigned int extra = this->has_tlsdesc_entry() ? 2 : 1; | |
1973 | unsigned int plt_size = (count + extra) * plt_entry_size; | |
1974 | // Offset of the APLT. | |
1975 | this->aplt_offset_ = plt_size; | |
1976 | // Size of the APLT. | |
1977 | plt_size += count * aplt_entry_size; | |
1978 | this->set_data_size(plt_size); | |
1979 | } | |
1980 | ||
1981 | // The first entry in the BND PLT. | |
1982 | ||
1983 | const unsigned char | |
1984 | Output_data_plt_x86_64_bnd::first_plt_entry[plt_entry_size] = | |
1985 | { | |
1986 | // From AMD64 ABI Draft 0.98, page 76 | |
1987 | 0xff, 0x35, // pushq contents of memory address | |
1988 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
1989 | 0xf2, 0xff, 0x25, // bnd jmp indirect | |
1990 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
1991 | 0x0f, 0x1f, 0x00 // nop | |
1992 | }; | |
1993 | ||
1994 | void | |
1995 | Output_data_plt_x86_64_bnd::do_fill_first_plt_entry( | |
1996 | unsigned char* pov, | |
6624f3a1 CC |
1997 | elfcpp::Elf_types<64>::Elf_Addr got_address, |
1998 | elfcpp::Elf_types<64>::Elf_Addr plt_address) | |
7a0c0a14 CC |
1999 | { |
2000 | memcpy(pov, first_plt_entry, plt_entry_size); | |
2001 | // We do a jmp relative to the PC at the end of this instruction. | |
2002 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
2003 | (got_address + 8 | |
2004 | - (plt_address + 6))); | |
2005 | elfcpp::Swap<32, false>::writeval(pov + 9, | |
2006 | (got_address + 16 | |
2007 | - (plt_address + 13))); | |
2008 | } | |
2009 | ||
2010 | // Subsequent entries in the BND PLT. | |
2011 | ||
2012 | const unsigned char | |
2013 | Output_data_plt_x86_64_bnd::plt_entry[plt_entry_size] = | |
2014 | { | |
2015 | // From AMD64 ABI Draft 0.99.8, page 139 | |
2016 | 0x68, // pushq immediate | |
2017 | 0, 0, 0, 0, // replaced with offset into relocation table | |
2018 | 0xf2, 0xe9, // bnd jmpq relative | |
2019 | 0, 0, 0, 0, // replaced with offset to start of .plt | |
2020 | 0x0f, 0x1f, 0x44, 0, 0 // nop | |
2021 | }; | |
2022 | ||
2023 | // Entries in the BND Additional PLT. | |
2024 | ||
2025 | const unsigned char | |
2026 | Output_data_plt_x86_64_bnd::aplt_entry[aplt_entry_size] = | |
2027 | { | |
2028 | // From AMD64 ABI Draft 0.99.8, page 139 | |
2029 | 0xf2, 0xff, 0x25, // bnd jmpq indirect | |
2030 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
2031 | 0x90, // nop | |
2032 | }; | |
2033 | ||
2034 | unsigned int | |
2035 | Output_data_plt_x86_64_bnd::do_fill_plt_entry( | |
2036 | unsigned char* pov, | |
6624f3a1 CC |
2037 | elfcpp::Elf_types<64>::Elf_Addr, |
2038 | elfcpp::Elf_types<64>::Elf_Addr, | |
7a0c0a14 CC |
2039 | unsigned int, |
2040 | unsigned int plt_offset, | |
2041 | unsigned int plt_index) | |
2042 | { | |
2043 | memcpy(pov, plt_entry, plt_entry_size); | |
2044 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 1, plt_index); | |
2045 | elfcpp::Swap<32, false>::writeval(pov + 7, -(plt_offset + 11)); | |
2046 | return 0; | |
2047 | } | |
2048 | ||
2049 | void | |
2050 | Output_data_plt_x86_64_bnd::fill_aplt_entry( | |
2051 | unsigned char* pov, | |
6624f3a1 CC |
2052 | elfcpp::Elf_types<64>::Elf_Addr got_address, |
2053 | elfcpp::Elf_types<64>::Elf_Addr plt_address, | |
7a0c0a14 CC |
2054 | unsigned int got_offset, |
2055 | unsigned int plt_offset, | |
2056 | unsigned int plt_index) | |
2057 | { | |
2058 | // Check PC-relative offset overflow in PLT entry. | |
2059 | uint64_t plt_got_pcrel_offset = (got_address + got_offset | |
2060 | - (plt_address + plt_offset + 7)); | |
2061 | if (Bits<32>::has_overflow(plt_got_pcrel_offset)) | |
2062 | gold_error(_("PC-relative offset overflow in APLT entry %d"), | |
2063 | plt_index + 1); | |
2064 | ||
2065 | memcpy(pov, aplt_entry, aplt_entry_size); | |
2066 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, plt_got_pcrel_offset); | |
2067 | } | |
2068 | ||
2069 | // The reserved TLSDESC entry in the PLT for an executable. | |
2070 | ||
2071 | const unsigned char | |
2072 | Output_data_plt_x86_64_bnd::tlsdesc_plt_entry[plt_entry_size] = | |
2073 | { | |
2074 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
2075 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
2076 | 0xff, 0x35, // pushq x(%rip) | |
2077 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
2078 | 0xf2, 0xff, 0x25, // jmpq *y(%rip) | |
2079 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
2080 | 0x0f, 0x1f, 0 // nop | |
2081 | }; | |
2082 | ||
2083 | void | |
2084 | Output_data_plt_x86_64_bnd::do_fill_tlsdesc_entry( | |
2085 | unsigned char* pov, | |
6624f3a1 CC |
2086 | elfcpp::Elf_types<64>::Elf_Addr got_address, |
2087 | elfcpp::Elf_types<64>::Elf_Addr plt_address, | |
2088 | elfcpp::Elf_types<64>::Elf_Addr got_base, | |
7a0c0a14 CC |
2089 | unsigned int tlsdesc_got_offset, |
2090 | unsigned int plt_offset) | |
2091 | { | |
2092 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
2093 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
2094 | (got_address + 8 | |
2095 | - (plt_address + plt_offset | |
2096 | + 6))); | |
2097 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
2098 | (got_base | |
2099 | + tlsdesc_got_offset | |
2100 | - (plt_address + plt_offset | |
2101 | + 13))); | |
2102 | } | |
2103 | ||
07a60597 ILT |
2104 | // The .eh_frame unwind information for the PLT. |
2105 | ||
fc51264f | 2106 | template<int size> |
2e702c99 | 2107 | const unsigned char |
fc51264f | 2108 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
2109 | { |
2110 | 1, // CIE version. | |
2111 | 'z', // Augmentation: augmentation size included. | |
2112 | 'R', // Augmentation: FDE encoding included. | |
2113 | '\0', // End of augmentation string. | |
2114 | 1, // Code alignment factor. | |
2115 | 0x78, // Data alignment factor. | |
2116 | 16, // Return address column. | |
2117 | 1, // Augmentation size. | |
2118 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
2119 | | elfcpp::DW_EH_PE_sdata4), | |
2120 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
2121 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
2122 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
2123 | elfcpp::DW_CFA_nop | |
2124 | }; | |
2125 | ||
fc51264f | 2126 | template<int size> |
07a60597 | 2127 | const unsigned char |
2e702c99 | 2128 | Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
2129 | { |
2130 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
2131 | 0, 0, 0, 0, // Replaced with size of .plt. | |
2132 | 0, // Augmentation size. | |
2133 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
2134 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
2135 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
2136 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
2137 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
2138 | 11, // Block length. | |
2139 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
2140 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
2141 | elfcpp::DW_OP_lit15, // Push 0xf. | |
2142 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
2143 | elfcpp::DW_OP_lit11, // Push 0xb. | |
2144 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
2145 | elfcpp::DW_OP_lit3, // Push 3. | |
2146 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
2147 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
2148 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
2149 | elfcpp::DW_CFA_nop, | |
2150 | elfcpp::DW_CFA_nop, | |
2151 | elfcpp::DW_CFA_nop | |
2152 | }; | |
2153 | ||
7a0c0a14 CC |
2154 | // The .eh_frame unwind information for the BND PLT. |
2155 | const unsigned char | |
2156 | Output_data_plt_x86_64_bnd::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
2157 | { | |
2158 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
2159 | 0, 0, 0, 0, // Replaced with size of .plt. | |
2160 | 0, // Augmentation size. | |
2161 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
2162 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
2163 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
2164 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
2165 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
2166 | 11, // Block length. | |
2167 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
2168 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
2169 | elfcpp::DW_OP_lit15, // Push 0xf. | |
2170 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
2171 | elfcpp::DW_OP_lit5, // Push 5. | |
2172 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 5) | |
2173 | elfcpp::DW_OP_lit3, // Push 3. | |
2174 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 5) << 3) | |
2175 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=5)<<3)+%rsp+8 | |
2176 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
2177 | elfcpp::DW_CFA_nop, | |
2178 | elfcpp::DW_CFA_nop, | |
2179 | elfcpp::DW_CFA_nop | |
2180 | }; | |
2181 | ||
2e30d253 ILT |
2182 | // Write out the PLT. This uses the hand-coded instructions above, |
2183 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
2184 | ||
fc51264f | 2185 | template<int size> |
2e30d253 | 2186 | void |
fc51264f | 2187 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 2188 | { |
2ea97941 | 2189 | const off_t offset = this->offset(); |
fe8718a4 ILT |
2190 | const section_size_type oview_size = |
2191 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 2192 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
2193 | |
2194 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
2195 | gold_assert(parameters->incremental_update() |
2196 | || (got_file_offset + this->got_plt_->data_size() | |
2197 | == this->got_irelative_->offset())); | |
fe8718a4 | 2198 | const section_size_type got_size = |
67181c72 ILT |
2199 | convert_to_section_size_type(this->got_plt_->data_size() |
2200 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
2201 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
2202 | got_size); | |
2203 | ||
2204 | unsigned char* pov = oview; | |
2205 | ||
c2b45e22 | 2206 | // The base address of the .plt section. |
fc51264f | 2207 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 2208 | // The base address of the .got section. |
fc51264f | 2209 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
2210 | // The base address of the PLT portion of the .got section, |
2211 | // which is where the GOT pointer will point, and where the | |
2212 | // three reserved GOT entries are located. | |
fc51264f L |
2213 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
2214 | = this->got_plt_->address(); | |
2e30d253 | 2215 | |
2e702c99 RM |
2216 | this->fill_first_plt_entry(pov, got_address, plt_address); |
2217 | pov += this->get_plt_entry_size(); | |
2e30d253 | 2218 | |
57b2284c CC |
2219 | // The first three entries in the GOT are reserved, and are written |
2220 | // by Output_data_got_plt_x86_64::do_write. | |
2221 | unsigned char* got_pov = got_view + 24; | |
2e30d253 | 2222 | |
2e702c99 | 2223 | unsigned int plt_offset = this->get_plt_entry_size(); |
2e30d253 | 2224 | unsigned int got_offset = 24; |
67181c72 | 2225 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
2226 | for (unsigned int plt_index = 0; |
2227 | plt_index < count; | |
2228 | ++plt_index, | |
2e702c99 | 2229 | pov += this->get_plt_entry_size(), |
2e30d253 | 2230 | got_pov += 8, |
2e702c99 | 2231 | plt_offset += this->get_plt_entry_size(), |
2e30d253 ILT |
2232 | got_offset += 8) |
2233 | { | |
2234 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
2235 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
2236 | got_address, plt_address, | |
2237 | got_offset, plt_offset, | |
2238 | plt_index); | |
2e30d253 ILT |
2239 | |
2240 | // Set the entry in the GOT. | |
2e702c99 RM |
2241 | elfcpp::Swap<64, false>::writeval(got_pov, |
2242 | plt_address + plt_offset + lazy_offset); | |
2e30d253 ILT |
2243 | } |
2244 | ||
c2b45e22 CC |
2245 | if (this->has_tlsdesc_entry()) |
2246 | { | |
2247 | // Set and adjust the reserved TLSDESC PLT entry. | |
2248 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2e702c99 RM |
2249 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, |
2250 | tlsdesc_got_offset, plt_offset); | |
2251 | pov += this->get_plt_entry_size(); | |
c2b45e22 CC |
2252 | } |
2253 | ||
fe8718a4 ILT |
2254 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
2255 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 2256 | |
2ea97941 | 2257 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
2258 | of->write_output_view(got_file_offset, got_size, got_view); |
2259 | } | |
2260 | ||
7a0c0a14 CC |
2261 | // Write out the BND PLT. |
2262 | ||
2263 | void | |
2264 | Output_data_plt_x86_64_bnd::do_write(Output_file* of) | |
2265 | { | |
2266 | const off_t offset = this->offset(); | |
2267 | const section_size_type oview_size = | |
2268 | convert_to_section_size_type(this->data_size()); | |
2269 | unsigned char* const oview = of->get_output_view(offset, oview_size); | |
2270 | ||
2271 | Output_data_got<64, false>* got = this->got(); | |
2272 | Output_data_got_plt_x86_64* got_plt = this->got_plt(); | |
2273 | Output_data_space* got_irelative = this->got_irelative(); | |
2274 | ||
2275 | const off_t got_file_offset = got_plt->offset(); | |
2276 | gold_assert(parameters->incremental_update() | |
2277 | || (got_file_offset + got_plt->data_size() | |
2278 | == got_irelative->offset())); | |
2279 | const section_size_type got_size = | |
2280 | convert_to_section_size_type(got_plt->data_size() | |
2281 | + got_irelative->data_size()); | |
2282 | unsigned char* const got_view = of->get_output_view(got_file_offset, | |
2283 | got_size); | |
2284 | ||
2285 | unsigned char* pov = oview; | |
2286 | ||
2287 | // The base address of the .plt section. | |
6624f3a1 | 2288 | elfcpp::Elf_types<64>::Elf_Addr plt_address = this->address(); |
7a0c0a14 | 2289 | // The base address of the .got section. |
6624f3a1 | 2290 | elfcpp::Elf_types<64>::Elf_Addr got_base = got->address(); |
7a0c0a14 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. | |
6624f3a1 | 2294 | elfcpp::Elf_types<64>::Elf_Addr got_address = got_plt->address(); |
7a0c0a14 CC |
2295 | |
2296 | this->fill_first_plt_entry(pov, got_address, plt_address); | |
2297 | pov += plt_entry_size; | |
2298 | ||
2299 | // The first three entries in the GOT are reserved, and are written | |
2300 | // by Output_data_got_plt_x86_64::do_write. | |
2301 | unsigned char* got_pov = got_view + 24; | |
2302 | ||
2303 | unsigned int plt_offset = plt_entry_size; | |
2304 | unsigned int got_offset = 24; | |
2305 | const unsigned int count = this->entry_count(); | |
2306 | for (unsigned int plt_index = 0; | |
2307 | plt_index < count; | |
2308 | ++plt_index, | |
2309 | pov += plt_entry_size, | |
2310 | got_pov += 8, | |
2311 | plt_offset += plt_entry_size, | |
2312 | got_offset += 8) | |
2313 | { | |
2314 | // Set and adjust the PLT entry itself. | |
2315 | unsigned int lazy_offset = this->fill_plt_entry(pov, | |
2316 | got_address, plt_address, | |
2317 | got_offset, plt_offset, | |
2318 | plt_index); | |
2319 | ||
2320 | // Set the entry in the GOT. | |
2321 | elfcpp::Swap<64, false>::writeval(got_pov, | |
2322 | plt_address + plt_offset + lazy_offset); | |
2323 | } | |
2324 | ||
2325 | if (this->has_tlsdesc_entry()) | |
2326 | { | |
2327 | // Set and adjust the reserved TLSDESC PLT entry. | |
2328 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2329 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, | |
2330 | tlsdesc_got_offset, plt_offset); | |
2331 | pov += this->get_plt_entry_size(); | |
2332 | } | |
2333 | ||
2334 | // Write the additional PLT. | |
2335 | got_offset = 24; | |
2336 | for (unsigned int plt_index = 0; | |
2337 | plt_index < count; | |
2338 | ++plt_index, | |
2339 | pov += aplt_entry_size, | |
2340 | plt_offset += aplt_entry_size, | |
2341 | got_offset += 8) | |
2342 | { | |
2343 | // Set and adjust the PLT entry itself. | |
2344 | this->fill_aplt_entry(pov, got_address, plt_address, got_offset, | |
2345 | plt_offset, plt_index); | |
2346 | } | |
2347 | ||
2348 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); | |
2349 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2350 | ||
2351 | of->write_output_view(offset, oview_size, oview); | |
2352 | of->write_output_view(got_file_offset, got_size, got_view); | |
2353 | } | |
2354 | ||
c2b45e22 | 2355 | // Create the PLT section. |
2e30d253 | 2356 | |
fc51264f | 2357 | template<int size> |
2e30d253 | 2358 | void |
fc51264f | 2359 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 2360 | { |
2e30d253 ILT |
2361 | if (this->plt_ == NULL) |
2362 | { | |
2363 | // Create the GOT sections first. | |
2364 | this->got_section(symtab, layout); | |
2365 | ||
2e702c99 RM |
2366 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
2367 | this->got_irelative_); | |
2368 | ||
2369 | // Add unwind information if requested. | |
2370 | if (parameters->options().ld_generated_unwind_info()) | |
2371 | this->plt_->add_eh_frame(layout); | |
2372 | ||
2e30d253 ILT |
2373 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
2374 | (elfcpp::SHF_ALLOC | |
2375 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 2376 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
2377 | |
2378 | // Make the sh_info field of .rela.plt point to .plt. | |
2379 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
2380 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 2381 | } |
c2b45e22 CC |
2382 | } |
2383 | ||
7a0c0a14 CC |
2384 | template<> |
2385 | Output_data_plt_x86_64<32>* | |
2386 | Target_x86_64<32>::do_make_data_plt(Layout* layout, | |
2387 | Output_data_got<64, false>* got, | |
2388 | Output_data_got_plt_x86_64* got_plt, | |
2389 | Output_data_space* got_irelative) | |
2390 | { | |
2391 | return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt, | |
2392 | got_irelative); | |
2393 | } | |
2394 | ||
2395 | template<> | |
2396 | Output_data_plt_x86_64<64>* | |
2397 | Target_x86_64<64>::do_make_data_plt(Layout* layout, | |
2398 | Output_data_got<64, false>* got, | |
2399 | Output_data_got_plt_x86_64* got_plt, | |
2400 | Output_data_space* got_irelative) | |
2401 | { | |
2402 | if (parameters->options().bndplt()) | |
2403 | return new Output_data_plt_x86_64_bnd(layout, got, got_plt, | |
2404 | got_irelative); | |
2405 | else | |
2406 | return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt, | |
2407 | got_irelative); | |
2408 | } | |
2409 | ||
2410 | template<> | |
2411 | Output_data_plt_x86_64<32>* | |
2412 | Target_x86_64<32>::do_make_data_plt(Layout* layout, | |
2413 | Output_data_got<64, false>* got, | |
2414 | Output_data_got_plt_x86_64* got_plt, | |
2415 | Output_data_space* got_irelative, | |
2416 | unsigned int plt_count) | |
2417 | { | |
2418 | return new Output_data_plt_x86_64_standard<32>(layout, got, got_plt, | |
2419 | got_irelative, | |
2420 | plt_count); | |
2421 | } | |
2422 | ||
2423 | template<> | |
2424 | Output_data_plt_x86_64<64>* | |
2425 | Target_x86_64<64>::do_make_data_plt(Layout* layout, | |
2426 | Output_data_got<64, false>* got, | |
2427 | Output_data_got_plt_x86_64* got_plt, | |
2428 | Output_data_space* got_irelative, | |
2429 | unsigned int plt_count) | |
2430 | { | |
2431 | if (parameters->options().bndplt()) | |
2432 | return new Output_data_plt_x86_64_bnd(layout, got, got_plt, | |
2433 | got_irelative, plt_count); | |
2434 | else | |
2435 | return new Output_data_plt_x86_64_standard<64>(layout, got, got_plt, | |
2436 | got_irelative, | |
2437 | plt_count); | |
2438 | } | |
2439 | ||
e291e7b9 ILT |
2440 | // Return the section for TLSDESC relocations. |
2441 | ||
fc51264f L |
2442 | template<int size> |
2443 | typename Target_x86_64<size>::Reloc_section* | |
2444 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
2445 | { |
2446 | return this->plt_section()->rela_tlsdesc(layout); | |
2447 | } | |
2448 | ||
c2b45e22 CC |
2449 | // Create a PLT entry for a global symbol. |
2450 | ||
fc51264f | 2451 | template<int size> |
c2b45e22 | 2452 | void |
fc51264f L |
2453 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
2454 | Symbol* gsym) | |
c2b45e22 CC |
2455 | { |
2456 | if (gsym->has_plt_offset()) | |
2457 | return; | |
2458 | ||
2459 | if (this->plt_ == NULL) | |
2460 | this->make_plt_section(symtab, layout); | |
2e30d253 | 2461 | |
67181c72 | 2462 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
2463 | } |
2464 | ||
7223e9ca ILT |
2465 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
2466 | ||
fc51264f | 2467 | template<int size> |
7223e9ca | 2468 | void |
fc51264f L |
2469 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
2470 | Symbol_table* symtab, Layout* layout, | |
2471 | Sized_relobj_file<size, false>* relobj, | |
2472 | unsigned int local_sym_index) | |
7223e9ca ILT |
2473 | { |
2474 | if (relobj->local_has_plt_offset(local_sym_index)) | |
2475 | return; | |
2476 | if (this->plt_ == NULL) | |
2477 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
2478 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
2479 | relobj, | |
7223e9ca ILT |
2480 | local_sym_index); |
2481 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
2482 | } | |
2483 | ||
0e70b911 CC |
2484 | // Return the number of entries in the PLT. |
2485 | ||
fc51264f | 2486 | template<int size> |
0e70b911 | 2487 | unsigned int |
fc51264f | 2488 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
2489 | { |
2490 | if (this->plt_ == NULL) | |
2491 | return 0; | |
2492 | return this->plt_->entry_count(); | |
2493 | } | |
2494 | ||
2495 | // Return the offset of the first non-reserved PLT entry. | |
2496 | ||
fc51264f | 2497 | template<int size> |
0e70b911 | 2498 | unsigned int |
fc51264f | 2499 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 2500 | { |
8474a88f L |
2501 | if (this->plt_ == NULL) |
2502 | return 0; | |
2e702c99 | 2503 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
2504 | } |
2505 | ||
2506 | // Return the size of each PLT entry. | |
2507 | ||
fc51264f | 2508 | template<int size> |
0e70b911 | 2509 | unsigned int |
fc51264f | 2510 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 2511 | { |
8474a88f L |
2512 | if (this->plt_ == NULL) |
2513 | return 0; | |
2e702c99 | 2514 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
2515 | } |
2516 | ||
4829d394 CC |
2517 | // Create the GOT and PLT sections for an incremental update. |
2518 | ||
fc51264f | 2519 | template<int size> |
dd74ae06 | 2520 | Output_data_got_base* |
fc51264f | 2521 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
2522 | Layout* layout, |
2523 | unsigned int got_count, | |
2524 | unsigned int plt_count) | |
2525 | { | |
2526 | gold_assert(this->got_ == NULL); | |
2527 | ||
2528 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
2529 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
2530 | (elfcpp::SHF_ALLOC | |
2531 | | elfcpp::SHF_WRITE), | |
2532 | this->got_, ORDER_RELRO_LAST, | |
2533 | true); | |
2534 | ||
2535 | // Add the three reserved entries. | |
57b2284c | 2536 | this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8); |
4829d394 CC |
2537 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
2538 | (elfcpp::SHF_ALLOC | |
2539 | | elfcpp::SHF_WRITE), | |
2540 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
2541 | false); | |
2542 | ||
2543 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
2544 | this->global_offset_table_ = | |
2545 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
2546 | Symbol_table::PREDEFINED, | |
2547 | this->got_plt_, | |
2548 | 0, 0, elfcpp::STT_OBJECT, | |
2549 | elfcpp::STB_LOCAL, | |
2550 | elfcpp::STV_HIDDEN, 0, | |
2551 | false, false); | |
2552 | ||
2553 | // If there are any TLSDESC relocations, they get GOT entries in | |
2554 | // .got.plt after the jump slot entries. | |
2555 | // FIXME: Get the count for TLSDESC entries. | |
2556 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
2557 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
2558 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
2559 | this->got_tlsdesc_, | |
2560 | ORDER_NON_RELRO_FIRST, false); | |
2561 | ||
67181c72 ILT |
2562 | // If there are any IRELATIVE relocations, they get GOT entries in |
2563 | // .got.plt after the jump slot and TLSDESC entries. | |
2564 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
2565 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
2566 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
2567 | this->got_irelative_, | |
2568 | ORDER_NON_RELRO_FIRST, false); | |
2569 | ||
4829d394 | 2570 | // Create the PLT section. |
2e702c99 RM |
2571 | this->plt_ = this->make_data_plt(layout, this->got_, |
2572 | this->got_plt_, | |
2573 | this->got_irelative_, | |
2574 | plt_count); | |
2575 | ||
2576 | // Add unwind information if requested. | |
2577 | if (parameters->options().ld_generated_unwind_info()) | |
2578 | this->plt_->add_eh_frame(layout); | |
2579 | ||
4829d394 CC |
2580 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
2581 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
2582 | this->plt_, ORDER_PLT, false); | |
2583 | ||
2584 | // Make the sh_info field of .rela.plt point to .plt. | |
2585 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
2586 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2587 | ||
6fa2a40b CC |
2588 | // Create the rela_dyn section. |
2589 | this->rela_dyn_section(layout); | |
2590 | ||
4829d394 CC |
2591 | return this->got_; |
2592 | } | |
2593 | ||
6fa2a40b CC |
2594 | // Reserve a GOT entry for a local symbol, and regenerate any |
2595 | // necessary dynamic relocations. | |
2596 | ||
fc51264f | 2597 | template<int size> |
6fa2a40b | 2598 | void |
fc51264f | 2599 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 2600 | unsigned int got_index, |
fc51264f | 2601 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
2602 | unsigned int r_sym, |
2603 | unsigned int got_type) | |
2604 | { | |
2605 | unsigned int got_offset = got_index * 8; | |
2606 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
2607 | ||
2608 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
2609 | switch (got_type) | |
2610 | { | |
2611 | case GOT_TYPE_STANDARD: | |
2612 | if (parameters->options().output_is_position_independent()) | |
2613 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2614 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2615 | break; |
2616 | case GOT_TYPE_TLS_OFFSET: | |
2617 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
2618 | this->got_, got_offset, 0); | |
2619 | break; | |
2620 | case GOT_TYPE_TLS_PAIR: | |
2621 | this->got_->reserve_slot(got_index + 1); | |
2622 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
2623 | this->got_, got_offset, 0); | |
2624 | break; | |
2625 | case GOT_TYPE_TLS_DESC: | |
2626 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
2627 | // this->got_->reserve_slot(got_index + 1); | |
2628 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2629 | // this->got_, got_offset, 0); | |
2630 | break; | |
2631 | default: | |
2632 | gold_unreachable(); | |
2633 | } | |
2634 | } | |
2635 | ||
2636 | // Reserve a GOT entry for a global symbol, and regenerate any | |
2637 | // necessary dynamic relocations. | |
2638 | ||
fc51264f | 2639 | template<int size> |
6fa2a40b | 2640 | void |
fc51264f L |
2641 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
2642 | Symbol* gsym, | |
2643 | unsigned int got_type) | |
6fa2a40b CC |
2644 | { |
2645 | unsigned int got_offset = got_index * 8; | |
2646 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
2647 | ||
2648 | this->got_->reserve_global(got_index, gsym, got_type); | |
2649 | switch (got_type) | |
2650 | { | |
2651 | case GOT_TYPE_STANDARD: | |
2652 | if (!gsym->final_value_is_known()) | |
2653 | { | |
2654 | if (gsym->is_from_dynobj() | |
2655 | || gsym->is_undefined() | |
2656 | || gsym->is_preemptible() | |
2657 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2658 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
2659 | this->got_, got_offset, 0); | |
2660 | else | |
2661 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 2662 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2663 | } |
2664 | break; | |
2665 | case GOT_TYPE_TLS_OFFSET: | |
2666 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
13cf9988 | 2667 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2668 | break; |
2669 | case GOT_TYPE_TLS_PAIR: | |
2670 | this->got_->reserve_slot(got_index + 1); | |
2671 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
13cf9988 | 2672 | this->got_, got_offset, 0, false); |
6fa2a40b | 2673 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, |
13cf9988 | 2674 | this->got_, got_offset + 8, 0, false); |
6fa2a40b CC |
2675 | break; |
2676 | case GOT_TYPE_TLS_DESC: | |
2677 | this->got_->reserve_slot(got_index + 1); | |
2678 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
13cf9988 | 2679 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2680 | break; |
2681 | default: | |
2682 | gold_unreachable(); | |
2683 | } | |
2684 | } | |
2685 | ||
4829d394 CC |
2686 | // Register an existing PLT entry for a global symbol. |
2687 | ||
fc51264f | 2688 | template<int size> |
4829d394 | 2689 | void |
fc51264f L |
2690 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
2691 | Layout* layout, | |
2692 | unsigned int plt_index, | |
2693 | Symbol* gsym) | |
4829d394 CC |
2694 | { |
2695 | gold_assert(this->plt_ != NULL); | |
2696 | gold_assert(!gsym->has_plt_offset()); | |
2697 | ||
2698 | this->plt_->reserve_slot(plt_index); | |
2699 | ||
2700 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
2701 | ||
2702 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 2703 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
2704 | } |
2705 | ||
26d3c67d CC |
2706 | // Force a COPY relocation for a given symbol. |
2707 | ||
fc51264f | 2708 | template<int size> |
26d3c67d | 2709 | void |
fc51264f | 2710 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
2711 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
2712 | { | |
2713 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 2714 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
2715 | os, |
2716 | offset, | |
2717 | this->rela_dyn_section(NULL)); | |
2718 | } | |
2719 | ||
9fa33bee | 2720 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 2721 | |
fc51264f | 2722 | template<int size> |
edfbb029 | 2723 | void |
fc51264f L |
2724 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
2725 | Layout* layout) | |
edfbb029 CC |
2726 | { |
2727 | if (this->tls_base_symbol_defined_) | |
2728 | return; | |
2729 | ||
2730 | Output_segment* tls_segment = layout->tls_segment(); | |
2731 | if (tls_segment != NULL) | |
2732 | { | |
183fd0e3 | 2733 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 2734 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 2735 | Symbol_table::PREDEFINED, |
edfbb029 CC |
2736 | tls_segment, 0, 0, |
2737 | elfcpp::STT_TLS, | |
2738 | elfcpp::STB_LOCAL, | |
2739 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
2740 | (is_exec |
2741 | ? Symbol::SEGMENT_END | |
2742 | : Symbol::SEGMENT_START), | |
2743 | true); | |
edfbb029 CC |
2744 | } |
2745 | this->tls_base_symbol_defined_ = true; | |
2746 | } | |
2747 | ||
c2b45e22 CC |
2748 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
2749 | ||
fc51264f | 2750 | template<int size> |
c2b45e22 | 2751 | void |
fc51264f | 2752 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
2e702c99 | 2753 | Layout* layout) |
c2b45e22 CC |
2754 | { |
2755 | if (this->plt_ == NULL) | |
2756 | this->make_plt_section(symtab, layout); | |
2757 | ||
2758 | if (!this->plt_->has_tlsdesc_entry()) | |
2759 | { | |
2760 | // Allocate the TLSDESC_GOT entry. | |
2761 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2762 | unsigned int got_offset = got->add_constant(0); | |
2763 | ||
2764 | // Allocate the TLSDESC_PLT entry. | |
2765 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
2766 | } | |
2767 | } | |
2768 | ||
31d60480 ILT |
2769 | // Create a GOT entry for the TLS module index. |
2770 | ||
fc51264f | 2771 | template<int size> |
31d60480 | 2772 | unsigned int |
fc51264f L |
2773 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
2774 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
2775 | { |
2776 | if (this->got_mod_index_offset_ == -1U) | |
2777 | { | |
2778 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
2779 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
2780 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2781 | unsigned int got_offset = got->add_constant(0); | |
2782 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
2e702c99 | 2783 | got_offset, 0); |
009a67a2 | 2784 | got->add_constant(0); |
31d60480 ILT |
2785 | this->got_mod_index_offset_ = got_offset; |
2786 | } | |
2787 | return this->got_mod_index_offset_; | |
2788 | } | |
2789 | ||
2e30d253 ILT |
2790 | // Optimize the TLS relocation type based on what we know about the |
2791 | // symbol. IS_FINAL is true if the final address of this symbol is | |
2792 | // known at link time. | |
2793 | ||
fc51264f | 2794 | template<int size> |
e041f13d | 2795 | tls::Tls_optimization |
fc51264f | 2796 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 2797 | { |
2e30d253 ILT |
2798 | // If we are generating a shared library, then we can't do anything |
2799 | // in the linker. | |
8851ecca | 2800 | if (parameters->options().shared()) |
e041f13d | 2801 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2802 | |
2803 | switch (r_type) | |
2804 | { | |
2805 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
2806 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2807 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2808 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
2809 | // access. Since we know that we are generating an executable, |
2810 | // we can convert this to Initial-Exec. If we also know that | |
2811 | // this is a local symbol, we can further switch to Local-Exec. | |
2812 | if (is_final) | |
e041f13d ILT |
2813 | return tls::TLSOPT_TO_LE; |
2814 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 2815 | |
d61c17ea | 2816 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
2817 | // This is Local-Dynamic, which refers to a local symbol in the |
2818 | // dynamic TLS block. Since we know that we generating an | |
2819 | // executable, we can switch to Local-Exec. | |
e041f13d | 2820 | return tls::TLSOPT_TO_LE; |
2e30d253 | 2821 | |
0ffd9845 | 2822 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
2823 | case elfcpp::R_X86_64_DTPOFF64: |
2824 | // Another Local-Dynamic reloc. | |
e041f13d | 2825 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 2826 | |
d61c17ea | 2827 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
2828 | // These are Initial-Exec relocs which get the thread offset |
2829 | // from the GOT. If we know that we are linking against the | |
2830 | // local symbol, we can switch to Local-Exec, which links the | |
2831 | // thread offset into the instruction. | |
2832 | if (is_final) | |
e041f13d ILT |
2833 | return tls::TLSOPT_TO_LE; |
2834 | return tls::TLSOPT_NONE; | |
2e30d253 | 2835 | |
d61c17ea | 2836 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
2837 | // When we already have Local-Exec, there is nothing further we |
2838 | // can do. | |
e041f13d | 2839 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2840 | |
2841 | default: | |
2842 | gold_unreachable(); | |
2843 | } | |
2e30d253 ILT |
2844 | } |
2845 | ||
95a2c8d6 RS |
2846 | // Get the Reference_flags for a particular relocation. |
2847 | ||
fc51264f | 2848 | template<int size> |
95a2c8d6 | 2849 | int |
fc51264f | 2850 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
2851 | { |
2852 | switch (r_type) | |
2853 | { | |
2854 | case elfcpp::R_X86_64_NONE: | |
2855 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
2856 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2857 | case elfcpp::R_X86_64_GOTPC32: | |
2858 | case elfcpp::R_X86_64_GOTPC64: | |
2859 | // No symbol reference. | |
2860 | return 0; | |
2861 | ||
2862 | case elfcpp::R_X86_64_64: | |
2863 | case elfcpp::R_X86_64_32: | |
2864 | case elfcpp::R_X86_64_32S: | |
2865 | case elfcpp::R_X86_64_16: | |
2866 | case elfcpp::R_X86_64_8: | |
2867 | return Symbol::ABSOLUTE_REF; | |
2868 | ||
2869 | case elfcpp::R_X86_64_PC64: | |
2870 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2871 | case elfcpp::R_X86_64_PC32_BND: |
95a2c8d6 RS |
2872 | case elfcpp::R_X86_64_PC16: |
2873 | case elfcpp::R_X86_64_PC8: | |
2874 | case elfcpp::R_X86_64_GOTOFF64: | |
2875 | return Symbol::RELATIVE_REF; | |
2876 | ||
2877 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 2878 | case elfcpp::R_X86_64_PLT32_BND: |
95a2c8d6 RS |
2879 | case elfcpp::R_X86_64_PLTOFF64: |
2880 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
2881 | ||
2882 | case elfcpp::R_X86_64_GOT64: | |
2883 | case elfcpp::R_X86_64_GOT32: | |
2884 | case elfcpp::R_X86_64_GOTPCREL64: | |
2885 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
2886 | case elfcpp::R_X86_64_GOTPCRELX: |
2887 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
95a2c8d6 RS |
2888 | case elfcpp::R_X86_64_GOTPLT64: |
2889 | // Absolute in GOT. | |
2890 | return Symbol::ABSOLUTE_REF; | |
2891 | ||
2892 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2893 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2894 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2895 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2896 | case elfcpp::R_X86_64_DTPOFF32: | |
2897 | case elfcpp::R_X86_64_DTPOFF64: | |
2898 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2899 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2900 | return Symbol::TLS_REF; | |
2901 | ||
2902 | case elfcpp::R_X86_64_COPY: | |
2903 | case elfcpp::R_X86_64_GLOB_DAT: | |
2904 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2905 | case elfcpp::R_X86_64_RELATIVE: | |
2906 | case elfcpp::R_X86_64_IRELATIVE: | |
2907 | case elfcpp::R_X86_64_TPOFF64: | |
2908 | case elfcpp::R_X86_64_DTPMOD64: | |
2909 | case elfcpp::R_X86_64_TLSDESC: | |
2910 | case elfcpp::R_X86_64_SIZE32: | |
2911 | case elfcpp::R_X86_64_SIZE64: | |
2912 | default: | |
2913 | // Not expected. We will give an error later. | |
2914 | return 0; | |
2915 | } | |
2916 | } | |
2917 | ||
e041f13d ILT |
2918 | // Report an unsupported relocation against a local symbol. |
2919 | ||
fc51264f | 2920 | template<int size> |
e041f13d | 2921 | void |
fc51264f L |
2922 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
2923 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2924 | unsigned int r_type) |
e041f13d | 2925 | { |
75f2446e ILT |
2926 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2927 | object->name().c_str(), r_type); | |
e041f13d ILT |
2928 | } |
2929 | ||
a036edd8 ILT |
2930 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
2931 | // dynamic linker does not support it, issue an error. The GNU linker | |
2932 | // only issues a non-PIC error for an allocated read-only section. | |
2933 | // Here we know the section is allocated, but we don't know that it is | |
2934 | // read-only. But we check for all the relocation types which the | |
2935 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
2936 | // error even if the section is not read-only. If GSYM is not NULL, |
2937 | // it is the symbol the relocation is against; if it is NULL, the | |
2938 | // relocation is against a local symbol. | |
a036edd8 | 2939 | |
fc51264f | 2940 | template<int size> |
a036edd8 | 2941 | void |
fc51264f L |
2942 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
2943 | Symbol* gsym) | |
a036edd8 ILT |
2944 | { |
2945 | switch (r_type) | |
2946 | { | |
2fbb4320 ILT |
2947 | // These are the relocation types supported by glibc for x86_64 |
2948 | // which should always work. | |
a036edd8 | 2949 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 2950 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
2951 | case elfcpp::R_X86_64_GLOB_DAT: |
2952 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2953 | case elfcpp::R_X86_64_DTPMOD64: | |
2954 | case elfcpp::R_X86_64_DTPOFF64: | |
2955 | case elfcpp::R_X86_64_TPOFF64: | |
2956 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
2957 | case elfcpp::R_X86_64_COPY: |
2958 | return; | |
2959 | ||
2960 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 2961 | case elfcpp::R_X86_64_PC32: |
f49fe902 | 2962 | case elfcpp::R_X86_64_PC32_BND: |
a29b0dad ILT |
2963 | // A PC relative reference is OK against a local symbol or if |
2964 | // the symbol is defined locally. | |
2965 | if (gsym == NULL | |
2966 | || (!gsym->is_from_dynobj() | |
2967 | && !gsym->is_undefined() | |
2968 | && !gsym->is_preemptible())) | |
2969 | return; | |
d8e90251 | 2970 | // Fall through. |
a29b0dad | 2971 | case elfcpp::R_X86_64_32: |
3660ff06 L |
2972 | // R_X86_64_32 is OK for x32. |
2973 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2974 | return; | |
2fbb4320 ILT |
2975 | if (this->issued_non_pic_error_) |
2976 | return; | |
2977 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
2978 | if (gsym == NULL) |
2979 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
2980 | "overflow at runtime; recompile with -fPIC")); | |
2981 | else | |
f49fe902 L |
2982 | { |
2983 | const char *r_name; | |
2984 | switch (r_type) | |
2985 | { | |
2986 | case elfcpp::R_X86_64_32: | |
2987 | r_name = "R_X86_64_32"; | |
2988 | break; | |
2989 | case elfcpp::R_X86_64_PC32: | |
2990 | r_name = "R_X86_64_PC32"; | |
2991 | break; | |
2992 | case elfcpp::R_X86_64_PC32_BND: | |
2993 | r_name = "R_X86_64_PC32_BND"; | |
2994 | break; | |
2995 | default: | |
2996 | gold_unreachable(); | |
2997 | break; | |
2998 | } | |
2999 | object->error(_("requires dynamic %s reloc against '%s' " | |
3000 | "which may overflow at runtime; recompile " | |
3001 | "with -fPIC"), | |
3002 | r_name, gsym->name()); | |
3003 | } | |
2fbb4320 | 3004 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
3005 | return; |
3006 | ||
3007 | default: | |
3008 | // This prevents us from issuing more than one error per reloc | |
3009 | // section. But we can still wind up issuing more than one | |
3010 | // error per object file. | |
3011 | if (this->issued_non_pic_error_) | |
2e702c99 | 3012 | return; |
33aea2fd | 3013 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad | 3014 | object->error(_("requires unsupported dynamic reloc %u; " |
2e702c99 | 3015 | "recompile with -fPIC"), |
a29b0dad | 3016 | r_type); |
a036edd8 ILT |
3017 | this->issued_non_pic_error_ = true; |
3018 | return; | |
3019 | ||
3020 | case elfcpp::R_X86_64_NONE: | |
3021 | gold_unreachable(); | |
3022 | } | |
3023 | } | |
3024 | ||
7223e9ca ILT |
3025 | // Return whether we need to make a PLT entry for a relocation of the |
3026 | // given type against a STT_GNU_IFUNC symbol. | |
3027 | ||
fc51264f | 3028 | template<int size> |
7223e9ca | 3029 | bool |
fc51264f L |
3030 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
3031 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 3032 | unsigned int r_type) |
7223e9ca | 3033 | { |
95a2c8d6 RS |
3034 | int flags = Scan::get_reference_flags(r_type); |
3035 | if (flags & Symbol::TLS_REF) | |
3036 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 3037 | object->name().c_str(), r_type); |
95a2c8d6 | 3038 | return flags != 0; |
7223e9ca ILT |
3039 | } |
3040 | ||
2e30d253 ILT |
3041 | // Scan a relocation for a local symbol. |
3042 | ||
fc51264f | 3043 | template<int size> |
2e30d253 | 3044 | inline void |
fc51264f L |
3045 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
3046 | Layout* layout, | |
3047 | Target_x86_64<size>* target, | |
3048 | Sized_relobj_file<size, false>* object, | |
3049 | unsigned int data_shndx, | |
3050 | Output_section* output_section, | |
3051 | const elfcpp::Rela<size, false>& reloc, | |
3052 | unsigned int r_type, | |
bfdfa4cd AM |
3053 | const elfcpp::Sym<size, false>& lsym, |
3054 | bool is_discarded) | |
2e30d253 | 3055 | { |
bfdfa4cd AM |
3056 | if (is_discarded) |
3057 | return; | |
3058 | ||
7223e9ca | 3059 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
3060 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
3061 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 3062 | { |
fc51264f | 3063 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
3064 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
3065 | } | |
3066 | ||
2e30d253 ILT |
3067 | switch (r_type) |
3068 | { | |
3069 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3070 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3071 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3072 | break; |
3073 | ||
3074 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 3075 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
3076 | // executable), we need to create a dynamic relocation for this |
3077 | // location. The relocation applied at link time will apply the | |
3078 | // link-time value, so we flag the location with an | |
3079 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 3080 | // relocate it easily. |
8851ecca | 3081 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
3082 | { |
3083 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
3084 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca | 3085 | rela_dyn->add_local_relative(object, r_sym, |
62fe925a | 3086 | (size == 32 |
fd885f3a L |
3087 | ? elfcpp::R_X86_64_RELATIVE64 |
3088 | : elfcpp::R_X86_64_RELATIVE), | |
7223e9ca ILT |
3089 | output_section, data_shndx, |
3090 | reloc.get_r_offset(), | |
397b129b | 3091 | reloc.get_r_addend(), is_ifunc); |
2e702c99 | 3092 | } |
d61c6bd4 ILT |
3093 | break; |
3094 | ||
2e30d253 ILT |
3095 | case elfcpp::R_X86_64_32: |
3096 | case elfcpp::R_X86_64_32S: | |
3097 | case elfcpp::R_X86_64_16: | |
3098 | case elfcpp::R_X86_64_8: | |
96f2030e | 3099 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
3100 | // executable), we need to create a dynamic relocation for this |
3101 | // location. We can't use an R_X86_64_RELATIVE relocation | |
3102 | // because that is always a 64-bit relocation. | |
8851ecca | 3103 | if (parameters->options().output_is_position_independent()) |
2e702c99 | 3104 | { |
3660ff06 L |
3105 | // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32. |
3106 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
3107 | { | |
3108 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
3109 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
3110 | rela_dyn->add_local_relative(object, r_sym, | |
3111 | elfcpp::R_X86_64_RELATIVE, | |
3112 | output_section, data_shndx, | |
3113 | reloc.get_r_offset(), | |
3114 | reloc.get_r_addend(), is_ifunc); | |
3115 | break; | |
3116 | } | |
3117 | ||
2e702c99 | 3118 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 3119 | |
2e702c99 | 3120 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 3121 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
2e702c99 | 3122 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
3123 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
3124 | data_shndx, reloc.get_r_offset(), | |
3125 | reloc.get_r_addend()); | |
2e702c99 RM |
3126 | else |
3127 | { | |
3128 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
3129 | unsigned int shndx = lsym.get_st_shndx(); |
3130 | bool is_ordinary; | |
3131 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
3132 | &is_ordinary); | |
3133 | if (!is_ordinary) | |
3134 | object->error(_("section symbol %u has bad shndx %u"), | |
3135 | r_sym, shndx); | |
3136 | else | |
3137 | rela_dyn->add_local_section(object, shndx, | |
3138 | r_type, output_section, | |
3139 | data_shndx, reloc.get_r_offset(), | |
3140 | reloc.get_r_addend()); | |
2e702c99 RM |
3141 | } |
3142 | } | |
2e30d253 ILT |
3143 | break; |
3144 | ||
3145 | case elfcpp::R_X86_64_PC64: | |
3146 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 3147 | case elfcpp::R_X86_64_PC32_BND: |
2e30d253 ILT |
3148 | case elfcpp::R_X86_64_PC16: |
3149 | case elfcpp::R_X86_64_PC8: | |
3150 | break; | |
3151 | ||
f389a824 | 3152 | case elfcpp::R_X86_64_PLT32: |
f49fe902 | 3153 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 ILT |
3154 | // Since we know this is a local symbol, we can handle this as a |
3155 | // PC32 reloc. | |
3156 | break; | |
3157 | ||
fdc2f80f | 3158 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 3159 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
3160 | case elfcpp::R_X86_64_GOTPC64: |
3161 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
3162 | // We need a GOT section. |
3163 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
3164 | // For PLTOFF64, we'd normally want a PLT section, but since we |
3165 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
3166 | break; |
3167 | ||
0ffd9845 ILT |
3168 | case elfcpp::R_X86_64_GOT64: |
3169 | case elfcpp::R_X86_64_GOT32: | |
3170 | case elfcpp::R_X86_64_GOTPCREL64: | |
3171 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3172 | case elfcpp::R_X86_64_GOTPCRELX: |
3173 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ee9e9e86 | 3174 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 3175 | { |
1fa29f10 | 3176 | // The symbol requires a GOT section. |
2e702c99 | 3177 | Output_data_got<64, false>* got = target->got_section(symtab, layout); |
1fa29f10 IT |
3178 | |
3179 | // If the relocation symbol isn't IFUNC, | |
3180 | // and is local, then we will convert | |
3181 | // mov foo@GOTPCREL(%rip), %reg | |
3182 | // to lea foo(%rip), %reg. | |
3183 | // in Relocate::relocate. | |
158600eb CC |
3184 | if (!parameters->incremental() |
3185 | && (r_type == elfcpp::R_X86_64_GOTPCREL | |
3186 | || r_type == elfcpp::R_X86_64_GOTPCRELX | |
3187 | || r_type == elfcpp::R_X86_64_REX_GOTPCRELX) | |
1fa29f10 IT |
3188 | && reloc.get_r_offset() >= 2 |
3189 | && !is_ifunc) | |
3190 | { | |
3191 | section_size_type stype; | |
3192 | const unsigned char* view = object->section_contents(data_shndx, | |
3193 | &stype, true); | |
3194 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
3195 | break; | |
3196 | } | |
3197 | ||
1fa29f10 | 3198 | // The symbol requires a GOT entry. |
2e702c99 | 3199 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
3200 | |
3201 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
3202 | // lets function pointers compare correctly with shared | |
3203 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
3204 | bool is_new; | |
397b129b | 3205 | if (is_ifunc) |
7223e9ca ILT |
3206 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
3207 | else | |
3208 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
3209 | if (is_new) |
3210 | { | |
3211 | // If we are generating a shared object, we need to add a | |
3212 | // dynamic relocation for this symbol's GOT entry. | |
3213 | if (parameters->options().output_is_position_independent()) | |
3214 | { | |
3215 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
3216 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
3217 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
3218 | { |
3219 | unsigned int got_offset = | |
3220 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
3221 | rela_dyn->add_local_relative(object, r_sym, | |
3222 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 3223 | got, got_offset, 0, is_ifunc); |
7223e9ca | 3224 | } |
2e702c99 RM |
3225 | else |
3226 | { | |
3227 | this->check_non_pic(object, r_type, NULL); | |
3228 | ||
3229 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
3230 | rela_dyn->add_local( | |
3231 | object, r_sym, r_type, got, | |
3232 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
3233 | } | |
3234 | } | |
3235 | } | |
3236 | // For GOTPLT64, we'd normally want a PLT section, but since | |
3237 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
3238 | } |
3239 | break; | |
3240 | ||
2e30d253 ILT |
3241 | case elfcpp::R_X86_64_COPY: |
3242 | case elfcpp::R_X86_64_GLOB_DAT: | |
3243 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3244 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3245 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3246 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3247 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3248 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3249 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3250 | gold_error(_("%s: unexpected reloc %u in object file"), |
3251 | object->name().c_str(), r_type); | |
2e30d253 ILT |
3252 | break; |
3253 | ||
d61c17ea | 3254 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3255 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3256 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3257 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3258 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3259 | case elfcpp::R_X86_64_DTPOFF32: |
3260 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3261 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3262 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 3263 | { |
8851ecca | 3264 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 3265 | const tls::Tls_optimization optimized_type |
2e702c99 | 3266 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
fc51264f | 3267 | r_type); |
2e30d253 ILT |
3268 | switch (r_type) |
3269 | { | |
2e702c99 RM |
3270 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
3271 | if (optimized_type == tls::TLSOPT_NONE) | |
3272 | { | |
3273 | // Create a pair of GOT entries for the module index and | |
3274 | // dtv-relative offset. | |
3275 | Output_data_got<64, false>* got | |
3276 | = target->got_section(symtab, layout); | |
3277 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
d491d34e ILT |
3278 | unsigned int shndx = lsym.get_st_shndx(); |
3279 | bool is_ordinary; | |
3280 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
3281 | if (!is_ordinary) | |
3282 | object->error(_("local symbol %u has bad shndx %u"), | |
3283 | r_sym, shndx); | |
2e702c99 | 3284 | else |
83896202 ILT |
3285 | got->add_local_pair_with_rel(object, r_sym, |
3286 | shndx, | |
3287 | GOT_TYPE_TLS_PAIR, | |
3288 | target->rela_dyn_section(layout), | |
bd73a62d | 3289 | elfcpp::R_X86_64_DTPMOD64); |
2e702c99 RM |
3290 | } |
3291 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 3292 | unsupported_reloc_local(object, r_type); |
2e702c99 | 3293 | break; |
7bf1f802 | 3294 | |
2e702c99 RM |
3295 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
3296 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
3297 | if (optimized_type == tls::TLSOPT_NONE) |
3298 | { | |
2e702c99 RM |
3299 | // Create reserved PLT and GOT entries for the resolver. |
3300 | target->reserve_tlsdesc_entries(symtab, layout); | |
3301 | ||
3302 | // Generate a double GOT entry with an | |
3303 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
3304 | // is resolved lazily, so the GOT entry needs to be in | |
3305 | // an area in .got.plt, not .got. Call got_section to | |
3306 | // make sure the section has been created. | |
a8df5856 | 3307 | target->got_section(symtab, layout); |
2e702c99 RM |
3308 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
3309 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
e291e7b9 ILT |
3310 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
3311 | { | |
3312 | unsigned int got_offset = got->add_constant(0); | |
3313 | got->add_constant(0); | |
3314 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
3315 | got_offset); | |
3316 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
3317 | // We store the arguments we need in a vector, and | |
3318 | // use the index into the vector as the parameter | |
3319 | // to pass to the target specific routines. | |
3320 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
3321 | void* arg = reinterpret_cast<void*>(intarg); | |
3322 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
3323 | got, got_offset, 0); | |
3324 | } | |
c2b45e22 CC |
3325 | } |
3326 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3327 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
3328 | break; |
3329 | ||
2e702c99 | 3330 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3331 | break; |
3332 | ||
2e702c99 | 3333 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3334 | if (optimized_type == tls::TLSOPT_NONE) |
3335 | { | |
2e702c99 RM |
3336 | // Create a GOT entry for the module index. |
3337 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3338 | } |
3339 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3340 | unsupported_reloc_local(object, r_type); | |
3341 | break; | |
3342 | ||
2e702c99 RM |
3343 | case elfcpp::R_X86_64_DTPOFF32: |
3344 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3345 | break; |
3346 | ||
2e702c99 | 3347 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3348 | layout->set_has_static_tls(); |
2e702c99 RM |
3349 | if (optimized_type == tls::TLSOPT_NONE) |
3350 | { | |
3351 | // Create a GOT entry for the tp-relative offset. | |
3352 | Output_data_got<64, false>* got | |
3353 | = target->got_section(symtab, layout); | |
3354 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
3355 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3356 | target->rela_dyn_section(layout), |
3357 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3358 | } |
3359 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3360 | unsupported_reloc_local(object, r_type); | |
3361 | break; | |
0ffd9845 | 3362 | |
2e702c99 | 3363 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3364 | layout->set_has_static_tls(); |
2e702c99 RM |
3365 | if (output_is_shared) |
3366 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 3367 | break; |
e041f13d | 3368 | |
2e702c99 RM |
3369 | default: |
3370 | gold_unreachable(); | |
2e30d253 ILT |
3371 | } |
3372 | } | |
3373 | break; | |
2e30d253 | 3374 | |
fdc2f80f ILT |
3375 | case elfcpp::R_X86_64_SIZE32: |
3376 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3377 | default: |
75f2446e ILT |
3378 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
3379 | object->name().c_str(), r_type); | |
2e30d253 ILT |
3380 | break; |
3381 | } | |
3382 | } | |
3383 | ||
3384 | ||
e041f13d ILT |
3385 | // Report an unsupported relocation against a global symbol. |
3386 | ||
fc51264f | 3387 | template<int size> |
e041f13d | 3388 | void |
fc51264f L |
3389 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
3390 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
3391 | unsigned int r_type, |
3392 | Symbol* gsym) | |
e041f13d | 3393 | { |
75f2446e | 3394 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3395 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
3396 | } |
3397 | ||
ce97fa81 | 3398 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 3399 | template<int size> |
21bb3914 | 3400 | inline bool |
4aebb631 RC |
3401 | Target_x86_64<size>::Scan::possible_function_pointer_reloc( |
3402 | Sized_relobj_file<size, false>* src_obj, | |
3403 | unsigned int src_indx, | |
3404 | unsigned int r_offset, | |
3405 | unsigned int r_type) | |
21bb3914 | 3406 | { |
21bb3914 ST |
3407 | switch (r_type) |
3408 | { | |
3409 | case elfcpp::R_X86_64_64: | |
3410 | case elfcpp::R_X86_64_32: | |
3411 | case elfcpp::R_X86_64_32S: | |
3412 | case elfcpp::R_X86_64_16: | |
3413 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
3414 | case elfcpp::R_X86_64_GOT64: |
3415 | case elfcpp::R_X86_64_GOT32: | |
3416 | case elfcpp::R_X86_64_GOTPCREL64: | |
3417 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3418 | case elfcpp::R_X86_64_GOTPCRELX: |
3419 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ce97fa81 | 3420 | case elfcpp::R_X86_64_GOTPLT64: |
21bb3914 | 3421 | { |
2e702c99 | 3422 | return true; |
21bb3914 | 3423 | } |
4aebb631 RC |
3424 | case elfcpp::R_X86_64_PC32: |
3425 | { | |
3426 | // This relocation may be used both for function calls and | |
3427 | // for taking address of a function. We distinguish between | |
3428 | // them by checking the opcodes. | |
3429 | uint64_t sh_flags = src_obj->section_flags(src_indx); | |
3430 | bool is_executable = (sh_flags & elfcpp::SHF_EXECINSTR) != 0; | |
3431 | if (is_executable) | |
3432 | { | |
3433 | section_size_type stype; | |
3434 | const unsigned char* view = src_obj->section_contents(src_indx, | |
3435 | &stype, | |
3436 | true); | |
3437 | ||
3438 | // call | |
3439 | if (r_offset >= 1 | |
3440 | && view[r_offset - 1] == 0xe8) | |
3441 | return false; | |
3442 | ||
3443 | // jmp | |
3444 | if (r_offset >= 1 | |
3445 | && view[r_offset - 1] == 0xe9) | |
3446 | return false; | |
3447 | ||
3448 | // jo/jno/jb/jnb/je/jne/jna/ja/js/jns/jp/jnp/jl/jge/jle/jg | |
3449 | if (r_offset >= 2 | |
3450 | && view[r_offset - 2] == 0x0f | |
3451 | && view[r_offset - 1] >= 0x80 | |
3452 | && view[r_offset - 1] <= 0x8f) | |
3453 | return false; | |
3454 | } | |
3455 | ||
3456 | // Be conservative and treat all others as function pointers. | |
3457 | return true; | |
3458 | } | |
21bb3914 ST |
3459 | } |
3460 | return false; | |
3461 | } | |
3462 | ||
3463 | // For safe ICF, scan a relocation for a local symbol to check if it | |
3464 | // corresponds to a function pointer being taken. In that case mark | |
3465 | // the function whose pointer was taken as not foldable. | |
3466 | ||
fc51264f | 3467 | template<int size> |
21bb3914 | 3468 | inline bool |
fc51264f | 3469 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
3470 | Symbol_table* , |
3471 | Layout* , | |
fc51264f | 3472 | Target_x86_64<size>* , |
4aebb631 RC |
3473 | Sized_relobj_file<size, false>* src_obj, |
3474 | unsigned int src_indx, | |
21bb3914 | 3475 | Output_section* , |
4aebb631 | 3476 | const elfcpp::Rela<size, false>& reloc, |
21bb3914 | 3477 | unsigned int r_type, |
fc51264f | 3478 | const elfcpp::Sym<size, false>&) |
21bb3914 ST |
3479 | { |
3480 | // When building a shared library, do not fold any local symbols as it is | |
3481 | // not possible to distinguish pointer taken versus a call by looking at | |
3482 | // the relocation types. | |
4aebb631 RC |
3483 | if (parameters->options().shared()) |
3484 | return true; | |
3485 | ||
3486 | return possible_function_pointer_reloc(src_obj, src_indx, | |
3487 | reloc.get_r_offset(), r_type); | |
21bb3914 ST |
3488 | } |
3489 | ||
3490 | // For safe ICF, scan a relocation for a global symbol to check if it | |
3491 | // corresponds to a function pointer being taken. In that case mark | |
3492 | // the function whose pointer was taken as not foldable. | |
3493 | ||
fc51264f | 3494 | template<int size> |
21bb3914 | 3495 | inline bool |
fc51264f | 3496 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
3497 | Symbol_table*, |
3498 | Layout* , | |
fc51264f | 3499 | Target_x86_64<size>* , |
4aebb631 RC |
3500 | Sized_relobj_file<size, false>* src_obj, |
3501 | unsigned int src_indx, | |
21bb3914 | 3502 | Output_section* , |
4aebb631 | 3503 | const elfcpp::Rela<size, false>& reloc, |
21bb3914 ST |
3504 | unsigned int r_type, |
3505 | Symbol* gsym) | |
3506 | { | |
3507 | // When building a shared library, do not fold symbols whose visibility | |
3508 | // is hidden, internal or protected. | |
4aebb631 RC |
3509 | if (parameters->options().shared() |
3510 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
3511 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
3512 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
3513 | return true; | |
3514 | ||
3515 | return possible_function_pointer_reloc(src_obj, src_indx, | |
3516 | reloc.get_r_offset(), r_type); | |
21bb3914 ST |
3517 | } |
3518 | ||
2e30d253 ILT |
3519 | // Scan a relocation for a global symbol. |
3520 | ||
fc51264f | 3521 | template<int size> |
2e30d253 | 3522 | inline void |
fc51264f | 3523 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
3524 | Layout* layout, |
3525 | Target_x86_64<size>* target, | |
3526 | Sized_relobj_file<size, false>* object, | |
3527 | unsigned int data_shndx, | |
3528 | Output_section* output_section, | |
3529 | const elfcpp::Rela<size, false>& reloc, | |
3530 | unsigned int r_type, | |
3531 | Symbol* gsym) | |
2e30d253 | 3532 | { |
7223e9ca ILT |
3533 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
3534 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
3535 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
3536 | target->make_plt_entry(symtab, layout, gsym); | |
3537 | ||
2e30d253 ILT |
3538 | switch (r_type) |
3539 | { | |
3540 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3541 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3542 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3543 | break; |
3544 | ||
3545 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
3546 | case elfcpp::R_X86_64_32: |
3547 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 3548 | case elfcpp::R_X86_64_16: |
2e30d253 | 3549 | case elfcpp::R_X86_64_8: |
96f2030e | 3550 | { |
2e702c99 RM |
3551 | // Make a PLT entry if necessary. |
3552 | if (gsym->needs_plt_entry()) | |
3553 | { | |
3554 | target->make_plt_entry(symtab, layout, gsym); | |
3555 | // Since this is not a PC-relative relocation, we may be | |
3556 | // taking the address of a function. In that case we need to | |
3557 | // set the entry in the dynamic symbol table to the address of | |
3558 | // the PLT entry. | |
3559 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
3560 | gsym->set_needs_dynsym_value(); | |
3561 | } | |
3562 | // Make a dynamic relocation if necessary. | |
3563 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
3564 | { | |
a82bef93 ST |
3565 | if (!parameters->options().output_is_position_independent() |
3566 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
3567 | { |
3568 | target->copy_reloc(symtab, layout, object, | |
3569 | data_shndx, output_section, gsym, reloc); | |
3570 | } | |
1bae613c L |
3571 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
3572 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
7223e9ca ILT |
3573 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
3574 | && gsym->can_use_relative_reloc(false) | |
3575 | && !gsym->is_from_dynobj() | |
3576 | && !gsym->is_undefined() | |
3577 | && !gsym->is_preemptible()) | |
3578 | { | |
3579 | // Use an IRELATIVE reloc for a locally defined | |
3580 | // STT_GNU_IFUNC symbol. This makes a function | |
3581 | // address in a PIE executable match the address in a | |
3582 | // shared library that it links against. | |
67181c72 ILT |
3583 | Reloc_section* rela_dyn = |
3584 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
3585 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
3586 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
3587 | output_section, object, | |
3588 | data_shndx, | |
3589 | reloc.get_r_offset(), | |
3590 | reloc.get_r_addend()); | |
3591 | } | |
b14016f0 L |
3592 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
3593 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
2e702c99 RM |
3594 | && gsym->can_use_relative_reloc(false)) |
3595 | { | |
3596 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
3597 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
3598 | output_section, object, | |
3599 | data_shndx, | |
3600 | reloc.get_r_offset(), | |
13cf9988 | 3601 | reloc.get_r_addend(), false); |
2e702c99 RM |
3602 | } |
3603 | else | |
3604 | { | |
3605 | this->check_non_pic(object, r_type, gsym); | |
3606 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
3607 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
3608 | data_shndx, reloc.get_r_offset(), | |
3609 | reloc.get_r_addend()); | |
3610 | } | |
3611 | } | |
d61c6bd4 ILT |
3612 | } |
3613 | break; | |
3614 | ||
3615 | case elfcpp::R_X86_64_PC64: | |
3616 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 3617 | case elfcpp::R_X86_64_PC32_BND: |
d61c6bd4 ILT |
3618 | case elfcpp::R_X86_64_PC16: |
3619 | case elfcpp::R_X86_64_PC8: | |
3620 | { | |
2e702c99 RM |
3621 | // Make a PLT entry if necessary. |
3622 | if (gsym->needs_plt_entry()) | |
3623 | target->make_plt_entry(symtab, layout, gsym); | |
3624 | // Make a dynamic relocation if necessary. | |
3625 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
3626 | { | |
a82bef93 ST |
3627 | if (parameters->options().output_is_executable() |
3628 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
3629 | { |
3630 | target->copy_reloc(symtab, layout, object, | |
3631 | data_shndx, output_section, gsym, reloc); | |
3632 | } | |
3633 | else | |
3634 | { | |
3635 | this->check_non_pic(object, r_type, gsym); | |
3636 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
3637 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
3638 | data_shndx, reloc.get_r_offset(), | |
3639 | reloc.get_r_addend()); | |
3640 | } | |
3641 | } | |
d61c6bd4 | 3642 | } |
2e30d253 ILT |
3643 | break; |
3644 | ||
ff006520 | 3645 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 3646 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
3647 | case elfcpp::R_X86_64_GOTPCREL64: |
3648 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3649 | case elfcpp::R_X86_64_GOTPCRELX: |
3650 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ff006520 | 3651 | case elfcpp::R_X86_64_GOTPLT64: |
2e30d253 | 3652 | { |
2e702c99 RM |
3653 | // The symbol requires a GOT entry. |
3654 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1fa29f10 IT |
3655 | |
3656 | // If we convert this from | |
3657 | // mov foo@GOTPCREL(%rip), %reg | |
3658 | // to lea foo(%rip), %reg. | |
3a4f096e ST |
3659 | // OR |
3660 | // if we convert | |
3661 | // (callq|jmpq) *foo@GOTPCRELX(%rip) to | |
3662 | // (callq|jmpq) foo | |
1fa29f10 | 3663 | // in Relocate::relocate, then there is nothing to do here. |
158600eb CC |
3664 | // We cannot make these optimizations in incremental linking mode, |
3665 | // because we look at the opcode to decide whether or not to make | |
3666 | // change, and during an incremental update, the change may have | |
3667 | // already been applied. | |
3a4f096e ST |
3668 | |
3669 | Lazy_view<size> view(object, data_shndx); | |
3670 | size_t r_offset = reloc.get_r_offset(); | |
158600eb CC |
3671 | if (!parameters->incremental() |
3672 | && r_offset >= 2 | |
3a4f096e ST |
3673 | && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type, |
3674 | r_offset, &view)) | |
3675 | break; | |
3676 | ||
158600eb CC |
3677 | if (!parameters->incremental() |
3678 | && r_offset >= 2 | |
3a4f096e ST |
3679 | && Target_x86_64<size>::can_convert_callq_to_direct(gsym, r_type, |
3680 | r_offset, | |
3681 | &view)) | |
3682 | break; | |
1fa29f10 | 3683 | |
2e702c99 | 3684 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
3685 | { |
3686 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
3687 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
3688 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
3689 | else | |
3690 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
3691 | } | |
2e702c99 RM |
3692 | else |
3693 | { | |
3694 | // If this symbol is not fully resolved, we need to add a | |
3695 | // dynamic relocation for it. | |
3696 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
07aa62f2 ILT |
3697 | |
3698 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
3699 | // | |
3700 | // 1) The symbol may be defined in some other module. | |
3701 | // | |
3702 | // 2) We are building a shared library and this is a | |
3703 | // protected symbol; using GLOB_DAT means that the dynamic | |
3704 | // linker can use the address of the PLT in the main | |
3705 | // executable when appropriate so that function address | |
3706 | // comparisons work. | |
3707 | // | |
3708 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
3709 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
3710 | if (gsym->is_from_dynobj() |
3711 | || gsym->is_undefined() | |
3712 | || gsym->is_preemptible() | |
07aa62f2 ILT |
3713 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
3714 | && parameters->options().shared()) | |
7223e9ca ILT |
3715 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
3716 | && parameters->options().output_is_position_independent())) | |
2e702c99 | 3717 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
83896202 | 3718 | elfcpp::R_X86_64_GLOB_DAT); |
2e702c99 RM |
3719 | else |
3720 | { | |
7223e9ca ILT |
3721 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
3722 | // offset into the GOT, so that function pointer | |
3723 | // comparisons work correctly. | |
3724 | bool is_new; | |
3725 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
3726 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
3727 | else | |
3728 | { | |
3729 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
3730 | // Tell the dynamic linker to use the PLT address | |
3731 | // when resolving relocations. | |
3732 | if (gsym->is_from_dynobj() | |
3733 | && !parameters->options().shared()) | |
3734 | gsym->set_needs_dynsym_value(); | |
3735 | } | |
2e702c99 | 3736 | if (is_new) |
7223e9ca ILT |
3737 | { |
3738 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
3739 | rela_dyn->add_global_relative(gsym, | |
3740 | elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 3741 | got, got_off, 0, false); |
7223e9ca | 3742 | } |
2e702c99 RM |
3743 | } |
3744 | } | |
2e30d253 ILT |
3745 | } |
3746 | break; | |
3747 | ||
3748 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 3749 | case elfcpp::R_X86_64_PLT32_BND: |
2e30d253 ILT |
3750 | // If the symbol is fully resolved, this is just a PC32 reloc. |
3751 | // Otherwise we need a PLT entry. | |
3752 | if (gsym->final_value_is_known()) | |
3753 | break; | |
96f2030e ILT |
3754 | // If building a shared library, we can also skip the PLT entry |
3755 | // if the symbol is defined in the output file and is protected | |
3756 | // or hidden. | |
3757 | if (gsym->is_defined() | |
2e702c99 RM |
3758 | && !gsym->is_from_dynobj() |
3759 | && !gsym->is_preemptible()) | |
96f2030e | 3760 | break; |
2e30d253 ILT |
3761 | target->make_plt_entry(symtab, layout, gsym); |
3762 | break; | |
3763 | ||
fdc2f80f | 3764 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 3765 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
3766 | case elfcpp::R_X86_64_GOTPC64: |
3767 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
3768 | // We need a GOT section. |
3769 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
3770 | // For PLTOFF64, we also need a PLT entry (but only if the |
3771 | // symbol is not fully resolved). | |
3772 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
3773 | && !gsym->final_value_is_known()) | |
3774 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
3775 | break; |
3776 | ||
2e30d253 ILT |
3777 | case elfcpp::R_X86_64_COPY: |
3778 | case elfcpp::R_X86_64_GLOB_DAT: | |
3779 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3780 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3781 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3782 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 3783 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3784 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 3785 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3786 | gold_error(_("%s: unexpected reloc %u in object file"), |
3787 | object->name().c_str(), r_type); | |
2e30d253 | 3788 | break; |
2e30d253 | 3789 | |
d61c17ea | 3790 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
3791 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3792 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3793 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3794 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3795 | case elfcpp::R_X86_64_DTPOFF32: |
3796 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3797 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3798 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 3799 | { |
65d92137 CC |
3800 | // For the Initial-Exec model, we can treat undef symbols as final |
3801 | // when building an executable. | |
3802 | const bool is_final = (gsym->final_value_is_known() || | |
3803 | (r_type == elfcpp::R_X86_64_GOTTPOFF && | |
3804 | gsym->is_undefined() && | |
3805 | parameters->options().output_is_executable())); | |
e041f13d | 3806 | const tls::Tls_optimization optimized_type |
2e702c99 | 3807 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3808 | switch (r_type) |
3809 | { | |
2e702c99 | 3810 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
3811 | if (optimized_type == tls::TLSOPT_NONE) |
3812 | { | |
2e702c99 RM |
3813 | // Create a pair of GOT entries for the module index and |
3814 | // dtv-relative offset. | |
3815 | Output_data_got<64, false>* got | |
3816 | = target->got_section(symtab, layout); | |
3817 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
83896202 ILT |
3818 | target->rela_dyn_section(layout), |
3819 | elfcpp::R_X86_64_DTPMOD64, | |
3820 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
3821 | } |
3822 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3823 | { | |
2e702c99 RM |
3824 | // Create a GOT entry for the tp-relative offset. |
3825 | Output_data_got<64, false>* got | |
3826 | = target->got_section(symtab, layout); | |
3827 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3828 | target->rela_dyn_section(layout), |
3829 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
3830 | } |
3831 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3832 | unsupported_reloc_global(object, r_type, gsym); | |
3833 | break; | |
3834 | ||
2e702c99 RM |
3835 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
3836 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
3837 | if (optimized_type == tls::TLSOPT_NONE) |
3838 | { | |
2e702c99 RM |
3839 | // Create reserved PLT and GOT entries for the resolver. |
3840 | target->reserve_tlsdesc_entries(symtab, layout); | |
3841 | ||
3842 | // Create a double GOT entry with an R_X86_64_TLSDESC | |
3843 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
3844 | // lazily, so the GOT entry needs to be in an area in | |
3845 | // .got.plt, not .got. Call got_section to make sure | |
3846 | // the section has been created. | |
a8df5856 | 3847 | target->got_section(symtab, layout); |
2e702c99 | 3848 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
ca09d69a | 3849 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
2e702c99 | 3850 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
83896202 | 3851 | elfcpp::R_X86_64_TLSDESC, 0); |
c2b45e22 CC |
3852 | } |
3853 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3854 | { | |
2e702c99 RM |
3855 | // Create a GOT entry for the tp-relative offset. |
3856 | Output_data_got<64, false>* got | |
3857 | = target->got_section(symtab, layout); | |
3858 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3859 | target->rela_dyn_section(layout), |
3860 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
3861 | } |
3862 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3863 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
3864 | break; |
3865 | ||
2e702c99 | 3866 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3867 | break; |
3868 | ||
2e702c99 | 3869 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3870 | if (optimized_type == tls::TLSOPT_NONE) |
3871 | { | |
2e702c99 RM |
3872 | // Create a GOT entry for the module index. |
3873 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3874 | } |
3875 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3876 | unsupported_reloc_global(object, r_type, gsym); | |
3877 | break; | |
3878 | ||
2e702c99 RM |
3879 | case elfcpp::R_X86_64_DTPOFF32: |
3880 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3881 | break; |
3882 | ||
2e702c99 | 3883 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3884 | layout->set_has_static_tls(); |
2e702c99 RM |
3885 | if (optimized_type == tls::TLSOPT_NONE) |
3886 | { | |
3887 | // Create a GOT entry for the tp-relative offset. | |
3888 | Output_data_got<64, false>* got | |
3889 | = target->got_section(symtab, layout); | |
3890 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3891 | target->rela_dyn_section(layout), |
3892 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3893 | } |
3894 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3895 | unsupported_reloc_global(object, r_type, gsym); | |
3896 | break; | |
0ffd9845 | 3897 | |
2e702c99 | 3898 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3899 | layout->set_has_static_tls(); |
2e702c99 | 3900 | if (parameters->options().shared()) |
b1759dce | 3901 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 | 3902 | break; |
e041f13d | 3903 | |
2e702c99 RM |
3904 | default: |
3905 | gold_unreachable(); | |
2e30d253 ILT |
3906 | } |
3907 | } | |
3908 | break; | |
fdc2f80f ILT |
3909 | |
3910 | case elfcpp::R_X86_64_SIZE32: | |
3911 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3912 | default: |
75f2446e | 3913 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3914 | object->name().c_str(), r_type, |
2e702c99 | 3915 | gsym->demangled_name().c_str()); |
2e30d253 ILT |
3916 | break; |
3917 | } | |
3918 | } | |
3919 | ||
fc51264f | 3920 | template<int size> |
6d03d481 | 3921 | void |
fc51264f L |
3922 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
3923 | Layout* layout, | |
3924 | Sized_relobj_file<size, false>* object, | |
3925 | unsigned int data_shndx, | |
3926 | unsigned int sh_type, | |
3927 | const unsigned char* prelocs, | |
3928 | size_t reloc_count, | |
3929 | Output_section* output_section, | |
3930 | bool needs_special_offset_handling, | |
3931 | size_t local_symbol_count, | |
3932 | const unsigned char* plocal_symbols) | |
6d03d481 | 3933 | { |
4d625b70 CC |
3934 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
3935 | Classify_reloc; | |
6d03d481 ST |
3936 | |
3937 | if (sh_type == elfcpp::SHT_REL) | |
3938 | { | |
3939 | return; | |
3940 | } | |
3941 | ||
4d625b70 CC |
3942 | gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan, |
3943 | Classify_reloc>( | |
6d03d481 ST |
3944 | symtab, |
3945 | layout, | |
3946 | this, | |
3947 | object, | |
3948 | data_shndx, | |
3949 | prelocs, | |
3950 | reloc_count, | |
3951 | output_section, | |
3952 | needs_special_offset_handling, | |
3953 | local_symbol_count, | |
3954 | plocal_symbols); | |
2e702c99 | 3955 | |
6d03d481 | 3956 | } |
2e30d253 ILT |
3957 | // Scan relocations for a section. |
3958 | ||
fc51264f | 3959 | template<int size> |
2e30d253 | 3960 | void |
fc51264f L |
3961 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
3962 | Layout* layout, | |
3963 | Sized_relobj_file<size, false>* object, | |
3964 | unsigned int data_shndx, | |
3965 | unsigned int sh_type, | |
3966 | const unsigned char* prelocs, | |
3967 | size_t reloc_count, | |
3968 | Output_section* output_section, | |
3969 | bool needs_special_offset_handling, | |
3970 | size_t local_symbol_count, | |
3971 | const unsigned char* plocal_symbols) | |
2e30d253 | 3972 | { |
4d625b70 CC |
3973 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
3974 | Classify_reloc; | |
3975 | ||
2e30d253 ILT |
3976 | if (sh_type == elfcpp::SHT_REL) |
3977 | { | |
75f2446e ILT |
3978 | gold_error(_("%s: unsupported REL reloc section"), |
3979 | object->name().c_str()); | |
3980 | return; | |
2e30d253 ILT |
3981 | } |
3982 | ||
4d625b70 | 3983 | gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>( |
2e30d253 ILT |
3984 | symtab, |
3985 | layout, | |
3986 | this, | |
3987 | object, | |
3988 | data_shndx, | |
3989 | prelocs, | |
3990 | reloc_count, | |
730cdc88 ILT |
3991 | output_section, |
3992 | needs_special_offset_handling, | |
2e30d253 | 3993 | local_symbol_count, |
730cdc88 | 3994 | plocal_symbols); |
2e30d253 ILT |
3995 | } |
3996 | ||
3997 | // Finalize the sections. | |
3998 | ||
fc51264f | 3999 | template<int size> |
2e30d253 | 4000 | void |
fc51264f | 4001 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
4002 | Layout* layout, |
4003 | const Input_objects*, | |
e785ec03 | 4004 | Symbol_table* symtab) |
2e30d253 | 4005 | { |
ea715a34 ILT |
4006 | const Reloc_section* rel_plt = (this->plt_ == NULL |
4007 | ? NULL | |
e291e7b9 | 4008 | : this->plt_->rela_plt()); |
ea715a34 | 4009 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 4010 | this->rela_dyn_, true, false); |
2e702c99 | 4011 | |
2e30d253 ILT |
4012 | // Fill in some more dynamic tags. |
4013 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
4014 | if (odyn != NULL) | |
4015 | { | |
22b127cc | 4016 | if (this->plt_ != NULL |
ea715a34 ILT |
4017 | && this->plt_->output_section() != NULL |
4018 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 4019 | { |
ea715a34 ILT |
4020 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
4021 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
4022 | this->got_->finalize_data_size(); | |
4023 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
4024 | this->plt_, plt_offset); | |
4025 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
4026 | this->got_, got_offset); | |
2e30d253 ILT |
4027 | } |
4028 | } | |
4029 | ||
4030 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
4031 | // relocs. | |
12c0daef ILT |
4032 | if (this->copy_relocs_.any_saved_relocs()) |
4033 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
4034 | |
4035 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
4036 | // the .got.plt section. | |
4037 | Symbol* sym = this->global_offset_table_; | |
4038 | if (sym != NULL) | |
4039 | { | |
4040 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 4041 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 4042 | } |
28a13fec | 4043 | |
67181c72 ILT |
4044 | if (parameters->doing_static_link() |
4045 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
4046 | { |
4047 | // If linking statically, make sure that the __rela_iplt symbols | |
4048 | // were defined if necessary, even if we didn't create a PLT. | |
4049 | static const Define_symbol_in_segment syms[] = | |
4050 | { | |
4051 | { | |
4052 | "__rela_iplt_start", // name | |
4053 | elfcpp::PT_LOAD, // segment_type | |
4054 | elfcpp::PF_W, // segment_flags_set | |
4055 | elfcpp::PF(0), // segment_flags_clear | |
4056 | 0, // value | |
4057 | 0, // size | |
4058 | elfcpp::STT_NOTYPE, // type | |
4059 | elfcpp::STB_GLOBAL, // binding | |
4060 | elfcpp::STV_HIDDEN, // visibility | |
4061 | 0, // nonvis | |
4062 | Symbol::SEGMENT_START, // offset_from_base | |
4063 | true // only_if_ref | |
4064 | }, | |
4065 | { | |
4066 | "__rela_iplt_end", // name | |
4067 | elfcpp::PT_LOAD, // segment_type | |
4068 | elfcpp::PF_W, // segment_flags_set | |
4069 | elfcpp::PF(0), // segment_flags_clear | |
4070 | 0, // value | |
4071 | 0, // size | |
4072 | elfcpp::STT_NOTYPE, // type | |
4073 | elfcpp::STB_GLOBAL, // binding | |
4074 | elfcpp::STV_HIDDEN, // visibility | |
4075 | 0, // nonvis | |
4076 | Symbol::SEGMENT_START, // offset_from_base | |
4077 | true // only_if_ref | |
4078 | } | |
4079 | }; | |
4080 | ||
4081 | symtab->define_symbols(layout, 2, syms, | |
4082 | layout->script_options()->saw_sections_clause()); | |
4083 | } | |
2e30d253 ILT |
4084 | } |
4085 | ||
19ef3f4d CC |
4086 | // For x32, we need to handle PC-relative relocations using full 64-bit |
4087 | // arithmetic, so that we can detect relocation overflows properly. | |
4088 | // This class overrides the pcrela32_check methods from the defaults in | |
4089 | // Relocate_functions in reloc.h. | |
4090 | ||
4091 | template<int size> | |
4092 | class X86_64_relocate_functions : public Relocate_functions<size, false> | |
4093 | { | |
4094 | public: | |
4095 | typedef Relocate_functions<size, false> Base; | |
4096 | ||
4097 | // Do a simple PC relative relocation with the addend in the | |
4098 | // relocation. | |
4099 | static inline typename Base::Reloc_status | |
4100 | pcrela32_check(unsigned char* view, | |
4101 | typename elfcpp::Elf_types<64>::Elf_Addr value, | |
4102 | typename elfcpp::Elf_types<64>::Elf_Swxword addend, | |
4103 | typename elfcpp::Elf_types<64>::Elf_Addr address) | |
4104 | { | |
4105 | typedef typename elfcpp::Swap<32, false>::Valtype Valtype; | |
4106 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
4107 | value = value + addend - address; | |
4108 | elfcpp::Swap<32, false>::writeval(wv, value); | |
4109 | return (Bits<32>::has_overflow(value) | |
4110 | ? Base::RELOC_OVERFLOW : Base::RELOC_OK); | |
4111 | } | |
4112 | ||
4113 | // Do a simple PC relative relocation with a Symbol_value with the | |
4114 | // addend in the relocation. | |
4115 | static inline typename Base::Reloc_status | |
4116 | pcrela32_check(unsigned char* view, | |
4117 | const Sized_relobj_file<size, false>* object, | |
4118 | const Symbol_value<size>* psymval, | |
4119 | typename elfcpp::Elf_types<64>::Elf_Swxword addend, | |
4120 | typename elfcpp::Elf_types<64>::Elf_Addr address) | |
4121 | { | |
4122 | typedef typename elfcpp::Swap<32, false>::Valtype Valtype; | |
4123 | Valtype* wv = reinterpret_cast<Valtype*>(view); | |
7c8b700c CC |
4124 | typename elfcpp::Elf_types<64>::Elf_Addr value; |
4125 | if (addend >= 0) | |
4126 | value = psymval->value(object, addend); | |
4127 | else | |
4128 | { | |
4129 | // For negative addends, get the symbol value without | |
4130 | // the addend, then add the addend using 64-bit arithmetic. | |
4131 | value = psymval->value(object, 0); | |
4132 | value += addend; | |
4133 | } | |
4134 | value -= address; | |
19ef3f4d CC |
4135 | elfcpp::Swap<32, false>::writeval(wv, value); |
4136 | return (Bits<32>::has_overflow(value) | |
4137 | ? Base::RELOC_OVERFLOW : Base::RELOC_OK); | |
4138 | } | |
4139 | }; | |
4140 | ||
2e30d253 ILT |
4141 | // Perform a relocation. |
4142 | ||
fc51264f | 4143 | template<int size> |
2e30d253 | 4144 | inline bool |
fc51264f L |
4145 | Target_x86_64<size>::Relocate::relocate( |
4146 | const Relocate_info<size, false>* relinfo, | |
91a65d2f | 4147 | unsigned int, |
fc51264f L |
4148 | Target_x86_64<size>* target, |
4149 | Output_section*, | |
4150 | size_t relnum, | |
91a65d2f | 4151 | const unsigned char* preloc, |
fc51264f L |
4152 | const Sized_symbol<size>* gsym, |
4153 | const Symbol_value<size>* psymval, | |
4154 | unsigned char* view, | |
4155 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
4156 | section_size_type view_size) | |
2e30d253 | 4157 | { |
19ef3f4d | 4158 | typedef X86_64_relocate_functions<size> Reloc_funcs; |
91a65d2f AM |
4159 | const elfcpp::Rela<size, false> rela(preloc); |
4160 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); | |
4161 | ||
2e30d253 ILT |
4162 | if (this->skip_call_tls_get_addr_) |
4163 | { | |
5efc7cd2 | 4164 | if ((r_type != elfcpp::R_X86_64_PLT32 |
f5713901 | 4165 | && r_type != elfcpp::R_X86_64_GOTPCREL |
ad961eab | 4166 | && r_type != elfcpp::R_X86_64_GOTPCRELX |
f49fe902 L |
4167 | && r_type != elfcpp::R_X86_64_PLT32_BND |
4168 | && r_type != elfcpp::R_X86_64_PC32_BND | |
2e702c99 | 4169 | && r_type != elfcpp::R_X86_64_PC32) |
2e30d253 | 4170 | || gsym == NULL |
0ffd9845 | 4171 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 4172 | { |
75f2446e ILT |
4173 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4174 | _("missing expected TLS relocation")); | |
f5713901 | 4175 | this->skip_call_tls_get_addr_ = false; |
75f2446e ILT |
4176 | } |
4177 | else | |
4178 | { | |
4179 | this->skip_call_tls_get_addr_ = false; | |
4180 | return false; | |
2e30d253 | 4181 | } |
2e30d253 ILT |
4182 | } |
4183 | ||
0e804863 ILT |
4184 | if (view == NULL) |
4185 | return true; | |
4186 | ||
fc51264f | 4187 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
4188 | |
4189 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 4190 | Symbol_value<size> symval; |
96f2030e | 4191 | if (gsym != NULL |
95a2c8d6 | 4192 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 4193 | { |
19fec8c1 | 4194 | symval.set_output_value(target->plt_address_for_global(gsym)); |
2e30d253 ILT |
4195 | psymval = &symval; |
4196 | } | |
7223e9ca ILT |
4197 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
4198 | { | |
fc51264f | 4199 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
4200 | if (object->local_has_plt_offset(r_sym)) |
4201 | { | |
19fec8c1 | 4202 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
4203 | psymval = &symval; |
4204 | } | |
4205 | } | |
2e30d253 | 4206 | |
0ffd9845 ILT |
4207 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
4208 | ||
4209 | // Get the GOT offset if needed. | |
96f2030e ILT |
4210 | // The GOT pointer points to the end of the GOT section. |
4211 | // We need to subtract the size of the GOT section to get | |
4212 | // the actual offset to use in the relocation. | |
0ffd9845 | 4213 | bool have_got_offset = false; |
c23dd342 L |
4214 | // Since the actual offset is always negative, we use signed int to |
4215 | // support 64-bit GOT relocations. | |
4216 | int got_offset = 0; | |
0ffd9845 ILT |
4217 | switch (r_type) |
4218 | { | |
4219 | case elfcpp::R_X86_64_GOT32: | |
4220 | case elfcpp::R_X86_64_GOT64: | |
4221 | case elfcpp::R_X86_64_GOTPLT64: | |
0ffd9845 ILT |
4222 | case elfcpp::R_X86_64_GOTPCREL64: |
4223 | if (gsym != NULL) | |
2e702c99 RM |
4224 | { |
4225 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
4226 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
4227 | } | |
0ffd9845 | 4228 | else |
2e702c99 RM |
4229 | { |
4230 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4231 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
4232 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
4233 | - target->got_size()); | |
4234 | } | |
0ffd9845 ILT |
4235 | have_got_offset = true; |
4236 | break; | |
4237 | ||
4238 | default: | |
4239 | break; | |
4240 | } | |
2e30d253 | 4241 | |
c34c98ed CC |
4242 | typename Reloc_funcs::Reloc_status rstatus = Reloc_funcs::RELOC_OK; |
4243 | ||
2e30d253 ILT |
4244 | switch (r_type) |
4245 | { | |
4246 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
4247 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
4248 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
4249 | break; |
4250 | ||
4251 | case elfcpp::R_X86_64_64: | |
c34c98ed | 4252 | Reloc_funcs::rela64(view, object, psymval, addend); |
2e30d253 ILT |
4253 | break; |
4254 | ||
4255 | case elfcpp::R_X86_64_PC64: | |
c34c98ed | 4256 | Reloc_funcs::pcrela64(view, object, psymval, addend, |
2e702c99 | 4257 | address); |
2e30d253 ILT |
4258 | break; |
4259 | ||
4260 | case elfcpp::R_X86_64_32: | |
c34c98ed CC |
4261 | rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend, |
4262 | Reloc_funcs::CHECK_UNSIGNED); | |
2e30d253 ILT |
4263 | break; |
4264 | ||
4265 | case elfcpp::R_X86_64_32S: | |
c34c98ed CC |
4266 | rstatus = Reloc_funcs::rela32_check(view, object, psymval, addend, |
4267 | Reloc_funcs::CHECK_SIGNED); | |
2e30d253 ILT |
4268 | break; |
4269 | ||
4270 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 4271 | case elfcpp::R_X86_64_PC32_BND: |
c34c98ed | 4272 | rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend, |
19ef3f4d | 4273 | address); |
2e30d253 ILT |
4274 | break; |
4275 | ||
4276 | case elfcpp::R_X86_64_16: | |
c34c98ed | 4277 | Reloc_funcs::rela16(view, object, psymval, addend); |
2e30d253 ILT |
4278 | break; |
4279 | ||
4280 | case elfcpp::R_X86_64_PC16: | |
c34c98ed | 4281 | Reloc_funcs::pcrela16(view, object, psymval, addend, address); |
2e30d253 ILT |
4282 | break; |
4283 | ||
4284 | case elfcpp::R_X86_64_8: | |
c34c98ed | 4285 | Reloc_funcs::rela8(view, object, psymval, addend); |
2e30d253 ILT |
4286 | break; |
4287 | ||
4288 | case elfcpp::R_X86_64_PC8: | |
c34c98ed | 4289 | Reloc_funcs::pcrela8(view, object, psymval, addend, address); |
2e30d253 ILT |
4290 | break; |
4291 | ||
4292 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 4293 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 | 4294 | gold_assert(gsym == NULL |
2e702c99 | 4295 | || gsym->has_plt_offset() |
99f8faca ILT |
4296 | || gsym->final_value_is_known() |
4297 | || (gsym->is_defined() | |
4298 | && !gsym->is_from_dynobj() | |
4299 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
4300 | // Note: while this code looks the same as for R_X86_64_PC32, it |
4301 | // behaves differently because psymval was set to point to | |
4302 | // the PLT entry, rather than the symbol, in Scan::global(). | |
c34c98ed | 4303 | rstatus = Reloc_funcs::pcrela32_check(view, object, psymval, addend, |
19ef3f4d | 4304 | address); |
2e30d253 ILT |
4305 | break; |
4306 | ||
ee9e9e86 ILT |
4307 | case elfcpp::R_X86_64_PLTOFF64: |
4308 | { | |
2e702c99 RM |
4309 | gold_assert(gsym); |
4310 | gold_assert(gsym->has_plt_offset() | |
4311 | || gsym->final_value_is_known()); | |
fc51264f | 4312 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
c23dd342 L |
4313 | // This is the address of GLOBAL_OFFSET_TABLE. |
4314 | got_address = target->got_plt_section()->address(); | |
c34c98ed | 4315 | Reloc_funcs::rela64(view, object, psymval, addend - got_address); |
ee9e9e86 | 4316 | } |
7849f6d8 | 4317 | break; |
ee9e9e86 | 4318 | |
2e30d253 | 4319 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 4320 | gold_assert(have_got_offset); |
c34c98ed | 4321 | Reloc_funcs::rela32(view, got_offset, addend); |
2e30d253 ILT |
4322 | break; |
4323 | ||
e822f2b1 ILT |
4324 | case elfcpp::R_X86_64_GOTPC32: |
4325 | { | |
2e702c99 | 4326 | gold_assert(gsym); |
fc51264f | 4327 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 4328 | value = target->got_plt_section()->address(); |
19ef3f4d | 4329 | Reloc_funcs::pcrela32_check(view, value, addend, address); |
e822f2b1 ILT |
4330 | } |
4331 | break; | |
4332 | ||
4333 | case elfcpp::R_X86_64_GOT64: | |
fdc2f80f | 4334 | case elfcpp::R_X86_64_GOTPLT64: |
de194d85 | 4335 | // R_X86_64_GOTPLT64 is obsolete and treated the same as |
e88ba8d5 | 4336 | // GOT64. |
0ffd9845 | 4337 | gold_assert(have_got_offset); |
c34c98ed | 4338 | Reloc_funcs::rela64(view, got_offset, addend); |
e822f2b1 ILT |
4339 | break; |
4340 | ||
4341 | case elfcpp::R_X86_64_GOTPC64: | |
4342 | { | |
2e702c99 | 4343 | gold_assert(gsym); |
fc51264f | 4344 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 4345 | value = target->got_plt_section()->address(); |
c34c98ed | 4346 | Reloc_funcs::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
4347 | } |
4348 | break; | |
4349 | ||
2e30d253 ILT |
4350 | case elfcpp::R_X86_64_GOTOFF64: |
4351 | { | |
fc51264f | 4352 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
2e30d253 | 4353 | value = (psymval->value(object, 0) |
96f2030e | 4354 | - target->got_plt_section()->address()); |
c34c98ed | 4355 | Reloc_funcs::rela64(view, value, addend); |
2e30d253 ILT |
4356 | } |
4357 | break; | |
4358 | ||
4359 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
4360 | case elfcpp::R_X86_64_GOTPCRELX: |
4361 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
2e30d253 | 4362 | { |
1fa29f10 IT |
4363 | // Convert |
4364 | // mov foo@GOTPCREL(%rip), %reg | |
4365 | // to lea foo(%rip), %reg. | |
4366 | // if possible. | |
158600eb CC |
4367 | if (!parameters->incremental() |
4368 | && ((gsym == NULL | |
4369 | && rela.get_r_offset() >= 2 | |
4370 | && view[-2] == 0x8b | |
4371 | && !psymval->is_ifunc_symbol()) | |
4372 | || (gsym != NULL | |
4373 | && rela.get_r_offset() >= 2 | |
4374 | && Target_x86_64<size>::can_convert_mov_to_lea(gsym, r_type, | |
4375 | 0, &view)))) | |
1fa29f10 IT |
4376 | { |
4377 | view[-2] = 0x8d; | |
19ef3f4d | 4378 | Reloc_funcs::pcrela32(view, object, psymval, addend, address); |
1fa29f10 | 4379 | } |
3a4f096e ST |
4380 | // Convert |
4381 | // callq *foo@GOTPCRELX(%rip) to | |
4382 | // addr32 callq foo | |
4383 | // and jmpq *foo@GOTPCRELX(%rip) to | |
4384 | // jmpq foo | |
4385 | // nop | |
158600eb CC |
4386 | else if (!parameters->incremental() |
4387 | && gsym != NULL | |
3a4f096e ST |
4388 | && rela.get_r_offset() >= 2 |
4389 | && Target_x86_64<size>::can_convert_callq_to_direct(gsym, | |
4390 | r_type, | |
4391 | 0, &view)) | |
4392 | { | |
4393 | if (view[-1] == 0x15) | |
4394 | { | |
4395 | // Convert callq *foo@GOTPCRELX(%rip) to addr32 callq. | |
4396 | // Opcode of addr32 is 0x67 and opcode of direct callq is 0xe8. | |
4397 | view[-2] = 0x67; | |
4398 | view[-1] = 0xe8; | |
4399 | // Convert GOTPCRELX to 32-bit pc relative reloc. | |
4400 | Reloc_funcs::pcrela32(view, object, psymval, addend, address); | |
4401 | } | |
4402 | else | |
4403 | { | |
4404 | // Convert jmpq *foo@GOTPCRELX(%rip) to | |
4405 | // jmpq foo | |
4406 | // nop | |
4407 | // The opcode of direct jmpq is 0xe9. | |
4408 | view[-2] = 0xe9; | |
4409 | // The opcode of nop is 0x90. | |
4410 | view[3] = 0x90; | |
4411 | // Convert GOTPCRELX to 32-bit pc relative reloc. jmpq is rip | |
4412 | // relative and since the instruction following the jmpq is now | |
4413 | // the nop, offset the address by 1 byte. The start of the | |
4414 | // relocation also moves ahead by 1 byte. | |
4415 | Reloc_funcs::pcrela32(&view[-1], object, psymval, addend, | |
4416 | address - 1); | |
4417 | } | |
4418 | } | |
1fa29f10 IT |
4419 | else |
4420 | { | |
4421 | if (gsym != NULL) | |
4422 | { | |
4423 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
ed35cc4a CC |
4424 | got_offset = (gsym->got_offset(GOT_TYPE_STANDARD) |
4425 | - target->got_size()); | |
1fa29f10 IT |
4426 | } |
4427 | else | |
4428 | { | |
4429 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
ed35cc4a CC |
4430 | gold_assert(object->local_has_got_offset(r_sym, |
4431 | GOT_TYPE_STANDARD)); | |
1fa29f10 IT |
4432 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) |
4433 | - target->got_size()); | |
4434 | } | |
4435 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
4436 | value = target->got_plt_section()->address() + got_offset; | |
19ef3f4d | 4437 | Reloc_funcs::pcrela32_check(view, value, addend, address); |
1fa29f10 | 4438 | } |
2e30d253 ILT |
4439 | } |
4440 | break; | |
4441 | ||
e822f2b1 ILT |
4442 | case elfcpp::R_X86_64_GOTPCREL64: |
4443 | { | |
2e702c99 RM |
4444 | gold_assert(have_got_offset); |
4445 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
4446 | value = target->got_plt_section()->address() + got_offset; | |
c34c98ed | 4447 | Reloc_funcs::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
4448 | } |
4449 | break; | |
4450 | ||
2e30d253 ILT |
4451 | case elfcpp::R_X86_64_COPY: |
4452 | case elfcpp::R_X86_64_GLOB_DAT: | |
4453 | case elfcpp::R_X86_64_JUMP_SLOT: | |
4454 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 4455 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 4456 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 4457 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 4458 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 4459 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
4460 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4461 | _("unexpected reloc %u in object file"), | |
4462 | r_type); | |
2e30d253 ILT |
4463 | break; |
4464 | ||
d61c17ea | 4465 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
4466 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
4467 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 4468 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 4469 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
4470 | case elfcpp::R_X86_64_DTPOFF32: |
4471 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
4472 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
4473 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 | 4474 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2e702c99 | 4475 | view, address, view_size); |
2e30d253 | 4476 | break; |
2e30d253 | 4477 | |
fdc2f80f ILT |
4478 | case elfcpp::R_X86_64_SIZE32: |
4479 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 4480 | default: |
75f2446e ILT |
4481 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4482 | _("unsupported reloc %u"), | |
4483 | r_type); | |
2e30d253 ILT |
4484 | break; |
4485 | } | |
4486 | ||
c34c98ed | 4487 | if (rstatus == Reloc_funcs::RELOC_OVERFLOW) |
17ecd016 CC |
4488 | { |
4489 | if (gsym == NULL) | |
4490 | { | |
4491 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4492 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
4493 | _("relocation overflow: " | |
4494 | "reference to local symbol %u in %s"), | |
4495 | r_sym, object->name().c_str()); | |
4496 | } | |
4497 | else if (gsym->is_defined() && gsym->source() == Symbol::FROM_OBJECT) | |
4498 | { | |
4499 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
4500 | _("relocation overflow: " | |
4501 | "reference to '%s' defined in %s"), | |
4502 | gsym->name(), | |
4503 | gsym->object()->name().c_str()); | |
4504 | } | |
4505 | else | |
4506 | { | |
4507 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
4508 | _("relocation overflow: reference to '%s'"), | |
4509 | gsym->name()); | |
4510 | } | |
4511 | } | |
c34c98ed | 4512 | |
2e30d253 ILT |
4513 | return true; |
4514 | } | |
4515 | ||
4516 | // Perform a TLS relocation. | |
4517 | ||
fc51264f | 4518 | template<int size> |
2e30d253 | 4519 | inline void |
fc51264f L |
4520 | Target_x86_64<size>::Relocate::relocate_tls( |
4521 | const Relocate_info<size, false>* relinfo, | |
4522 | Target_x86_64<size>* target, | |
4523 | size_t relnum, | |
4524 | const elfcpp::Rela<size, false>& rela, | |
4525 | unsigned int r_type, | |
4526 | const Sized_symbol<size>* gsym, | |
4527 | const Symbol_value<size>* psymval, | |
4528 | unsigned char* view, | |
4529 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
4530 | section_size_type view_size) | |
2e30d253 | 4531 | { |
2e30d253 | 4532 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 4533 | |
fc51264f | 4534 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 4535 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 4536 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 4537 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 4538 | |
fc51264f | 4539 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
4540 | |
4541 | const bool is_final = (gsym == NULL | |
b3705d2a | 4542 | ? !parameters->options().shared() |
2e30d253 | 4543 | : gsym->final_value_is_known()); |
36171d64 | 4544 | tls::Tls_optimization optimized_type |
fc51264f | 4545 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
4546 | switch (r_type) |
4547 | { | |
56622147 | 4548 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
4549 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
4550 | { | |
4551 | // If this code sequence is used in a non-executable section, | |
4552 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
4553 | // on the assumption that it's being used by itself in a debug | |
4554 | // section. Therefore, in the unlikely event that the code | |
4555 | // sequence appears in a non-executable section, we simply | |
4556 | // leave it unoptimized. | |
4557 | optimized_type = tls::TLSOPT_NONE; | |
4558 | } | |
e041f13d | 4559 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 4560 | { |
62855347 ILT |
4561 | if (tls_segment == NULL) |
4562 | { | |
191f1a2d ILT |
4563 | gold_assert(parameters->errors()->error_count() > 0 |
4564 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4565 | return; |
4566 | } | |
2e30d253 | 4567 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 4568 | rela, r_type, value, view, |
2e30d253 ILT |
4569 | view_size); |
4570 | break; | |
4571 | } | |
7bf1f802 | 4572 | else |
2e702c99 RM |
4573 | { |
4574 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
4575 | ? GOT_TYPE_TLS_OFFSET | |
4576 | : GOT_TYPE_TLS_PAIR); | |
4577 | unsigned int got_offset; | |
4578 | if (gsym != NULL) | |
4579 | { | |
4580 | gold_assert(gsym->has_got_offset(got_type)); | |
4581 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
4582 | } | |
4583 | else | |
4584 | { | |
4585 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4586 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
4587 | got_offset = (object->local_got_offset(r_sym, got_type) | |
4588 | - target->got_size()); | |
4589 | } | |
4590 | if (optimized_type == tls::TLSOPT_TO_IE) | |
4591 | { | |
4592 | value = target->got_plt_section()->address() + got_offset; | |
d21f123b | 4593 | this->tls_gd_to_ie(relinfo, relnum, rela, r_type, |
2e702c99 RM |
4594 | value, view, address, view_size); |
4595 | break; | |
4596 | } | |
4597 | else if (optimized_type == tls::TLSOPT_NONE) | |
4598 | { | |
4599 | // Relocate the field with the offset of the pair of GOT | |
4600 | // entries. | |
6a41d30b | 4601 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 4602 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 4603 | address); |
2e702c99 RM |
4604 | break; |
4605 | } | |
4606 | } | |
72ec2876 | 4607 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 4608 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
4609 | break; |
4610 | ||
c2b45e22 CC |
4611 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
4612 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
4613 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
4614 | { | |
4615 | // See above comment for R_X86_64_TLSGD. | |
4616 | optimized_type = tls::TLSOPT_NONE; | |
4617 | } | |
c2b45e22 CC |
4618 | if (optimized_type == tls::TLSOPT_TO_LE) |
4619 | { | |
62855347 ILT |
4620 | if (tls_segment == NULL) |
4621 | { | |
191f1a2d ILT |
4622 | gold_assert(parameters->errors()->error_count() > 0 |
4623 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4624 | return; |
4625 | } | |
c2b45e22 | 4626 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
4627 | rela, r_type, value, view, |
4628 | view_size); | |
c2b45e22 CC |
4629 | break; |
4630 | } | |
4631 | else | |
2e702c99 RM |
4632 | { |
4633 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
4634 | ? GOT_TYPE_TLS_OFFSET | |
4635 | : GOT_TYPE_TLS_DESC); | |
4636 | unsigned int got_offset = 0; | |
a8df5856 ILT |
4637 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC |
4638 | && optimized_type == tls::TLSOPT_NONE) | |
4639 | { | |
4640 | // We created GOT entries in the .got.tlsdesc portion of | |
4641 | // the .got.plt section, but the offset stored in the | |
4642 | // symbol is the offset within .got.tlsdesc. | |
4643 | got_offset = (target->got_size() | |
4644 | + target->got_plt_section()->data_size()); | |
4645 | } | |
2e702c99 RM |
4646 | if (gsym != NULL) |
4647 | { | |
4648 | gold_assert(gsym->has_got_offset(got_type)); | |
4649 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
4650 | } | |
4651 | else | |
4652 | { | |
4653 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4654 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
4655 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 4656 | - target->got_size()); |
2e702c99 RM |
4657 | } |
4658 | if (optimized_type == tls::TLSOPT_TO_IE) | |
4659 | { | |
2e702c99 | 4660 | value = target->got_plt_section()->address() + got_offset; |
d21f123b | 4661 | this->tls_desc_gd_to_ie(relinfo, relnum, |
2e702c99 RM |
4662 | rela, r_type, value, view, address, |
4663 | view_size); | |
4664 | break; | |
4665 | } | |
4666 | else if (optimized_type == tls::TLSOPT_NONE) | |
4667 | { | |
4668 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4669 | { | |
4670 | // Relocate the field with the offset of the pair of GOT | |
4671 | // entries. | |
4672 | value = target->got_plt_section()->address() + got_offset; | |
4673 | Relocate_functions<size, false>::pcrela32(view, value, addend, | |
fc51264f | 4674 | address); |
2e702c99 RM |
4675 | } |
4676 | break; | |
4677 | } | |
4678 | } | |
c2b45e22 CC |
4679 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4680 | _("unsupported reloc %u"), r_type); | |
4681 | break; | |
4682 | ||
56622147 | 4683 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
4684 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
4685 | { | |
4686 | // See above comment for R_X86_64_TLSGD. | |
4687 | optimized_type = tls::TLSOPT_NONE; | |
4688 | } | |
e041f13d | 4689 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 4690 | { |
62855347 ILT |
4691 | if (tls_segment == NULL) |
4692 | { | |
191f1a2d ILT |
4693 | gold_assert(parameters->errors()->error_count() > 0 |
4694 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4695 | return; |
4696 | } | |
72ec2876 ILT |
4697 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
4698 | value, view, view_size); | |
4699 | break; | |
2e702c99 | 4700 | } |
7bf1f802 | 4701 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
4702 | { |
4703 | // Relocate the field with the offset of the GOT entry for | |
4704 | // the module index. | |
4705 | unsigned int got_offset; | |
4706 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
31d60480 | 4707 | - target->got_size()); |
6a41d30b | 4708 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 4709 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 4710 | address); |
2e702c99 RM |
4711 | break; |
4712 | } | |
72ec2876 | 4713 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 4714 | _("unsupported reloc %u"), r_type); |
2e30d253 | 4715 | break; |
0ffd9845 ILT |
4716 | |
4717 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
4718 | // This relocation type is used in debugging information. |
4719 | // In that case we need to not optimize the value. If the | |
4720 | // section is not executable, then we assume we should not | |
4721 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
4722 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
4723 | // R_X86_64_TLSLD. | |
4724 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
4725 | { | |
62855347 ILT |
4726 | if (tls_segment == NULL) |
4727 | { | |
191f1a2d ILT |
4728 | gold_assert(parameters->errors()->error_count() > 0 |
4729 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4730 | return; |
4731 | } | |
36171d64 CC |
4732 | value -= tls_segment->memsz(); |
4733 | } | |
fc51264f | 4734 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
4735 | break; |
4736 | ||
4737 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
4738 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
4739 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
4740 | { | |
62855347 ILT |
4741 | if (tls_segment == NULL) |
4742 | { | |
191f1a2d ILT |
4743 | gold_assert(parameters->errors()->error_count() > 0 |
4744 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4745 | return; |
4746 | } | |
36171d64 CC |
4747 | value -= tls_segment->memsz(); |
4748 | } | |
fc51264f | 4749 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 4750 | break; |
2e30d253 | 4751 | |
56622147 | 4752 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
24dd5808 CC |
4753 | if (gsym != NULL |
4754 | && gsym->is_undefined() | |
4755 | && parameters->options().output_is_executable()) | |
65d92137 CC |
4756 | { |
4757 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, | |
4758 | NULL, rela, | |
4759 | r_type, value, view, | |
4760 | view_size); | |
4761 | break; | |
4762 | } | |
4763 | else if (optimized_type == tls::TLSOPT_TO_LE) | |
56622147 | 4764 | { |
62855347 ILT |
4765 | if (tls_segment == NULL) |
4766 | { | |
191f1a2d ILT |
4767 | gold_assert(parameters->errors()->error_count() > 0 |
4768 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4769 | return; |
4770 | } | |
fc51264f L |
4771 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
4772 | tls_segment, rela, | |
4773 | r_type, value, view, | |
4774 | view_size); | |
56622147 ILT |
4775 | break; |
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 tp-relative offset of the symbol. | |
4781 | unsigned int got_offset; | |
4782 | if (gsym != NULL) | |
4783 | { | |
4784 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); | |
4785 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
4786 | - target->got_size()); | |
4787 | } | |
4788 | else | |
4789 | { | |
4790 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
4791 | gold_assert(object->local_has_got_offset(r_sym, | |
4792 | GOT_TYPE_TLS_OFFSET)); | |
4793 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
4794 | - target->got_size()); | |
4795 | } | |
6a41d30b | 4796 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 4797 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 4798 | address); |
2e702c99 RM |
4799 | break; |
4800 | } | |
56622147 ILT |
4801 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
4802 | _("unsupported reloc type %u"), | |
4803 | r_type); | |
4804 | break; | |
0ffd9845 | 4805 | |
56622147 | 4806 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
4807 | if (tls_segment == NULL) |
4808 | { | |
191f1a2d ILT |
4809 | gold_assert(parameters->errors()->error_count() > 0 |
4810 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
4811 | return; |
4812 | } | |
6a41d30b | 4813 | value -= tls_segment->memsz(); |
fc51264f | 4814 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 4815 | break; |
2e30d253 | 4816 | } |
2e30d253 ILT |
4817 | } |
4818 | ||
7bf1f802 ILT |
4819 | // Do a relocation in which we convert a TLS General-Dynamic to an |
4820 | // Initial-Exec. | |
4821 | ||
fc51264f | 4822 | template<int size> |
7bf1f802 | 4823 | inline void |
fc51264f L |
4824 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
4825 | const Relocate_info<size, false>* relinfo, | |
4826 | size_t relnum, | |
fc51264f L |
4827 | const elfcpp::Rela<size, false>& rela, |
4828 | unsigned int, | |
4829 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4830 | unsigned char* view, | |
4831 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
4832 | section_size_type view_size) | |
7bf1f802 | 4833 | { |
41194d9f L |
4834 | // For SIZE == 64: |
4835 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4836 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4837 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
4838 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
4839 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f L |
4840 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax |
4841 | // For SIZE == 32: | |
4842 | // leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4843 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4844 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax | |
4845 | // leaq foo@tlsgd(%rip),%rdi; | |
4846 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f | 4847 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax |
7bf1f802 | 4848 | |
7bf1f802 | 4849 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
7bf1f802 | 4850 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
ad961eab L |
4851 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0 |
4852 | || memcmp(view + 4, "\x66\x48\xff", 3) == 0)); | |
7bf1f802 | 4853 | |
41194d9f L |
4854 | if (size == 64) |
4855 | { | |
4856 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4857 | -4); | |
4858 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4859 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
4860 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
4861 | 16); | |
4862 | } | |
4863 | else | |
4864 | { | |
4865 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4866 | -3); | |
4867 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4868 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
4869 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
4870 | 15); | |
4871 | } | |
7bf1f802 | 4872 | |
c2b45e22 | 4873 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
4874 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
4875 | address); | |
7bf1f802 ILT |
4876 | |
4877 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4878 | // We can skip it. | |
4879 | this->skip_call_tls_get_addr_ = true; | |
4880 | } | |
4881 | ||
e041f13d | 4882 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
4883 | // Local-Exec. |
4884 | ||
fc51264f | 4885 | template<int size> |
2e30d253 | 4886 | inline void |
fc51264f L |
4887 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
4888 | const Relocate_info<size, false>* relinfo, | |
4889 | size_t relnum, | |
4890 | Output_segment* tls_segment, | |
4891 | const elfcpp::Rela<size, false>& rela, | |
4892 | unsigned int, | |
4893 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4894 | unsigned char* view, | |
4895 | section_size_type view_size) | |
2e30d253 | 4896 | { |
41194d9f L |
4897 | // For SIZE == 64: |
4898 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4899 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4900 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
4901 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
4902 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f L |
4903 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax |
4904 | // For SIZE == 32: | |
4905 | // leaq foo@tlsgd(%rip),%rdi; | |
ad961eab L |
4906 | // .word 0x6666; rex64; call __tls_get_addr@PLT |
4907 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax | |
4908 | // leaq foo@tlsgd(%rip),%rdi; | |
4909 | // .word 0x66; rex64; call *__tls_get_addr@GOTPCREL(%rip) | |
41194d9f | 4910 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax |
2e30d253 | 4911 | |
72ec2876 | 4912 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
72ec2876 | 4913 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
ad961eab L |
4914 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0 |
4915 | || memcmp(view + 4, "\x66\x48\xff", 3) == 0)); | |
41194d9f L |
4916 | |
4917 | if (size == 64) | |
4918 | { | |
4919 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4920 | -4); | |
4921 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4922 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
4923 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", | |
4924 | 16); | |
4925 | } | |
4926 | else | |
4927 | { | |
4928 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4929 | -3); | |
4930 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4931 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
2e30d253 | 4932 | |
41194d9f L |
4933 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", |
4934 | 15); | |
4935 | } | |
2e30d253 | 4936 | |
6a41d30b | 4937 | value -= tls_segment->memsz(); |
fc51264f | 4938 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
4939 | |
4940 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4941 | // We can skip it. | |
4942 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
4943 | } |
4944 | ||
c2b45e22 CC |
4945 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
4946 | ||
fc51264f | 4947 | template<int size> |
c2b45e22 | 4948 | inline void |
fc51264f L |
4949 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
4950 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 | 4951 | size_t relnum, |
fc51264f | 4952 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 4953 | unsigned int r_type, |
fc51264f | 4954 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 4955 | unsigned char* view, |
fc51264f | 4956 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
4957 | section_size_type view_size) |
4958 | { | |
4959 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4960 | { | |
4961 | // leaq foo@tlsdesc(%rip), %rax | |
4962 | // ==> movq foo@gottpoff(%rip), %rax | |
4963 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4964 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4965 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4966 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
4967 | view[-2] = 0x8b; |
4968 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 4969 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
4970 | } |
4971 | else | |
4972 | { | |
4973 | // call *foo@tlscall(%rax) | |
4974 | // ==> nop; nop | |
4975 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
4976 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
4977 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4978 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
4979 | view[0] = 0x66; |
4980 | view[1] = 0x90; | |
4981 | } | |
4982 | } | |
4983 | ||
4984 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
4985 | ||
fc51264f | 4986 | template<int size> |
c2b45e22 | 4987 | inline void |
fc51264f L |
4988 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
4989 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
4990 | size_t relnum, |
4991 | Output_segment* tls_segment, | |
fc51264f | 4992 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 4993 | unsigned int r_type, |
fc51264f | 4994 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
4995 | unsigned char* view, |
4996 | section_size_type view_size) | |
4997 | { | |
4998 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4999 | { | |
5000 | // leaq foo@tlsdesc(%rip), %rax | |
5001 | // ==> movq foo@tpoff, %rax | |
5002 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
5003 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
5004 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 5005 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
5006 | view[-2] = 0xc7; |
5007 | view[-1] = 0xc0; | |
5008 | value -= tls_segment->memsz(); | |
fc51264f | 5009 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
5010 | } |
5011 | else | |
5012 | { | |
5013 | // call *foo@tlscall(%rax) | |
5014 | // ==> nop; nop | |
5015 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
5016 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
5017 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 5018 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
5019 | view[0] = 0x66; |
5020 | view[1] = 0x90; | |
5021 | } | |
5022 | } | |
5023 | ||
fc51264f | 5024 | template<int size> |
2e30d253 | 5025 | inline void |
fc51264f L |
5026 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
5027 | const Relocate_info<size, false>* relinfo, | |
5028 | size_t relnum, | |
5029 | Output_segment*, | |
5030 | const elfcpp::Rela<size, false>& rela, | |
5031 | unsigned int, | |
5032 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
5033 | unsigned char* view, | |
5034 | section_size_type view_size) | |
2e30d253 | 5035 | { |
72ec2876 | 5036 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
d2cf1c6c | 5037 | // For SIZE == 64: |
72ec2876 ILT |
5038 | // ... leq foo@dtpoff(%rax),%reg |
5039 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
d2cf1c6c L |
5040 | // For SIZE == 32: |
5041 | // ... leq foo@dtpoff(%rax),%reg | |
5042 | // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
ad961eab L |
5043 | // leaq foo@tlsld(%rip),%rdi; call *__tls_get_addr@GOTPCREL(%rip) |
5044 | // For SIZE == 64: | |
5045 | // ... leq foo@dtpoff(%rax),%reg | |
5046 | // ==> .word 0x6666; .byte 0x6666; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
5047 | // For SIZE == 32: | |
5048 | // ... leq foo@dtpoff(%rax),%reg | |
5049 | // ==> nopw 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 5050 | |
72ec2876 ILT |
5051 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
5052 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 5053 | |
72ec2876 | 5054 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 5055 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); |
72ec2876 | 5056 | |
ad961eab L |
5057 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
5058 | view[4] == 0xe8 || view[4] == 0xff); | |
72ec2876 | 5059 | |
ad961eab L |
5060 | if (view[4] == 0xe8) |
5061 | { | |
5062 | if (size == 64) | |
5063 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
5064 | else | |
5065 | memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12); | |
5066 | } | |
d2cf1c6c | 5067 | else |
ad961eab L |
5068 | { |
5069 | if (size == 64) | |
5070 | memcpy(view - 3, "\x66\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", | |
5071 | 13); | |
5072 | else | |
5073 | memcpy(view - 3, "\x66\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", | |
5074 | 13); | |
5075 | } | |
72ec2876 ILT |
5076 | |
5077 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
5078 | // We can skip it. | |
5079 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
5080 | } |
5081 | ||
56622147 ILT |
5082 | // Do a relocation in which we convert a TLS Initial-Exec to a |
5083 | // Local-Exec. | |
5084 | ||
fc51264f | 5085 | template<int size> |
56622147 | 5086 | inline void |
fc51264f L |
5087 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
5088 | const Relocate_info<size, false>* relinfo, | |
5089 | size_t relnum, | |
5090 | Output_segment* tls_segment, | |
5091 | const elfcpp::Rela<size, false>& rela, | |
5092 | unsigned int, | |
5093 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
5094 | unsigned char* view, | |
5095 | section_size_type view_size) | |
56622147 ILT |
5096 | { |
5097 | // We need to examine the opcodes to figure out which instruction we | |
5098 | // are looking at. | |
5099 | ||
5100 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
5101 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
5102 | ||
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 | ||
5106 | unsigned char op1 = view[-3]; | |
5107 | unsigned char op2 = view[-2]; | |
5108 | unsigned char op3 = view[-1]; | |
5109 | unsigned char reg = op3 >> 3; | |
5110 | ||
5111 | if (op2 == 0x8b) | |
5112 | { | |
5113 | // movq | |
5114 | if (op1 == 0x4c) | |
2e702c99 | 5115 | view[-3] = 0x49; |
e749cab8 L |
5116 | else if (size == 32 && op1 == 0x44) |
5117 | view[-3] = 0x41; | |
56622147 ILT |
5118 | view[-2] = 0xc7; |
5119 | view[-1] = 0xc0 | reg; | |
5120 | } | |
5121 | else if (reg == 4) | |
5122 | { | |
5123 | // Special handling for %rsp. | |
5124 | if (op1 == 0x4c) | |
2e702c99 | 5125 | view[-3] = 0x49; |
e749cab8 L |
5126 | else if (size == 32 && op1 == 0x44) |
5127 | view[-3] = 0x41; | |
56622147 ILT |
5128 | view[-2] = 0x81; |
5129 | view[-1] = 0xc0 | reg; | |
5130 | } | |
5131 | else | |
5132 | { | |
5133 | // addq | |
5134 | if (op1 == 0x4c) | |
2e702c99 | 5135 | view[-3] = 0x4d; |
e749cab8 L |
5136 | else if (size == 32 && op1 == 0x44) |
5137 | view[-3] = 0x45; | |
56622147 ILT |
5138 | view[-2] = 0x8d; |
5139 | view[-1] = 0x80 | reg | (reg << 3); | |
5140 | } | |
5141 | ||
65d92137 CC |
5142 | if (tls_segment != NULL) |
5143 | value -= tls_segment->memsz(); | |
fc51264f | 5144 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
5145 | } |
5146 | ||
2e30d253 ILT |
5147 | // Relocate section data. |
5148 | ||
fc51264f | 5149 | template<int size> |
2e30d253 | 5150 | void |
fc51264f L |
5151 | Target_x86_64<size>::relocate_section( |
5152 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
5153 | unsigned int sh_type, |
5154 | const unsigned char* prelocs, | |
5155 | size_t reloc_count, | |
5156 | Output_section* output_section, | |
5157 | bool needs_special_offset_handling, | |
5158 | unsigned char* view, | |
fc51264f | 5159 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
5160 | section_size_type view_size, |
5161 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 | 5162 | { |
4d625b70 CC |
5163 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5164 | Classify_reloc; | |
5165 | ||
2e30d253 ILT |
5166 | gold_assert(sh_type == elfcpp::SHT_RELA); |
5167 | ||
4d625b70 CC |
5168 | gold::relocate_section<size, false, Target_x86_64<size>, Relocate, |
5169 | gold::Default_comdat_behavior, Classify_reloc>( | |
2e30d253 ILT |
5170 | relinfo, |
5171 | this, | |
5172 | prelocs, | |
5173 | reloc_count, | |
730cdc88 ILT |
5174 | output_section, |
5175 | needs_special_offset_handling, | |
2e30d253 ILT |
5176 | view, |
5177 | address, | |
364c7fa5 ILT |
5178 | view_size, |
5179 | reloc_symbol_changes); | |
2e30d253 ILT |
5180 | } |
5181 | ||
94a3fc8b CC |
5182 | // Apply an incremental relocation. Incremental relocations always refer |
5183 | // to global symbols. | |
5184 | ||
fc51264f | 5185 | template<int size> |
94a3fc8b | 5186 | void |
fc51264f L |
5187 | Target_x86_64<size>::apply_relocation( |
5188 | const Relocate_info<size, false>* relinfo, | |
5189 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 5190 | unsigned int r_type, |
fc51264f | 5191 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
5192 | const Symbol* gsym, |
5193 | unsigned char* view, | |
fc51264f | 5194 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
5195 | section_size_type view_size) |
5196 | { | |
fc51264f | 5197 | gold::apply_relocation<size, false, Target_x86_64<size>, |
618d6666 | 5198 | typename Target_x86_64<size>::Relocate>( |
94a3fc8b CC |
5199 | relinfo, |
5200 | this, | |
5201 | r_offset, | |
5202 | r_type, | |
5203 | r_addend, | |
5204 | gsym, | |
5205 | view, | |
5206 | address, | |
5207 | view_size); | |
5208 | } | |
5209 | ||
4d625b70 | 5210 | // Scan the relocs during a relocatable link. |
6a74a719 | 5211 | |
fc51264f | 5212 | template<int size> |
4d625b70 CC |
5213 | void |
5214 | Target_x86_64<size>::scan_relocatable_relocs( | |
5215 | Symbol_table* symtab, | |
5216 | Layout* layout, | |
5217 | Sized_relobj_file<size, false>* object, | |
5218 | unsigned int data_shndx, | |
5219 | unsigned int sh_type, | |
5220 | const unsigned char* prelocs, | |
5221 | size_t reloc_count, | |
5222 | Output_section* output_section, | |
5223 | bool needs_special_offset_handling, | |
5224 | size_t local_symbol_count, | |
5225 | const unsigned char* plocal_symbols, | |
5226 | Relocatable_relocs* rr) | |
6a74a719 | 5227 | { |
4d625b70 CC |
5228 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5229 | Classify_reloc; | |
5230 | typedef gold::Default_scan_relocatable_relocs<Classify_reloc> | |
5231 | Scan_relocatable_relocs; | |
6a74a719 | 5232 | |
4d625b70 | 5233 | gold_assert(sh_type == elfcpp::SHT_RELA); |
6a74a719 | 5234 | |
4d625b70 CC |
5235 | gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>( |
5236 | symtab, | |
5237 | layout, | |
5238 | object, | |
5239 | data_shndx, | |
5240 | prelocs, | |
5241 | reloc_count, | |
5242 | output_section, | |
5243 | needs_special_offset_handling, | |
5244 | local_symbol_count, | |
5245 | plocal_symbols, | |
5246 | rr); | |
6a74a719 ILT |
5247 | } |
5248 | ||
4d625b70 | 5249 | // Scan the relocs for --emit-relocs. |
6a74a719 | 5250 | |
fc51264f | 5251 | template<int size> |
6a74a719 | 5252 | void |
4d625b70 | 5253 | Target_x86_64<size>::emit_relocs_scan( |
fc51264f L |
5254 | Symbol_table* symtab, |
5255 | Layout* layout, | |
5256 | Sized_relobj_file<size, false>* object, | |
5257 | unsigned int data_shndx, | |
5258 | unsigned int sh_type, | |
5259 | const unsigned char* prelocs, | |
5260 | size_t reloc_count, | |
5261 | Output_section* output_section, | |
5262 | bool needs_special_offset_handling, | |
5263 | size_t local_symbol_count, | |
4d625b70 | 5264 | const unsigned char* plocal_syms, |
fc51264f | 5265 | Relocatable_relocs* rr) |
6a74a719 | 5266 | { |
4d625b70 CC |
5267 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5268 | Classify_reloc; | |
5269 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> | |
5270 | Emit_relocs_strategy; | |
6a74a719 | 5271 | |
4d625b70 | 5272 | gold_assert(sh_type == elfcpp::SHT_RELA); |
6a74a719 | 5273 | |
4d625b70 | 5274 | gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>( |
6a74a719 ILT |
5275 | symtab, |
5276 | layout, | |
5277 | object, | |
5278 | data_shndx, | |
5279 | prelocs, | |
5280 | reloc_count, | |
5281 | output_section, | |
5282 | needs_special_offset_handling, | |
5283 | local_symbol_count, | |
4d625b70 | 5284 | plocal_syms, |
6a74a719 ILT |
5285 | rr); |
5286 | } | |
5287 | ||
5288 | // Relocate a section during a relocatable link. | |
5289 | ||
fc51264f | 5290 | template<int size> |
6a74a719 | 5291 | void |
7404fe1b | 5292 | Target_x86_64<size>::relocate_relocs( |
fc51264f | 5293 | const Relocate_info<size, false>* relinfo, |
6a74a719 ILT |
5294 | unsigned int sh_type, |
5295 | const unsigned char* prelocs, | |
5296 | size_t reloc_count, | |
5297 | Output_section* output_section, | |
62fe925a | 5298 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
6a74a719 | 5299 | unsigned char* view, |
fc51264f | 5300 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
5301 | section_size_type view_size, |
5302 | unsigned char* reloc_view, | |
5303 | section_size_type reloc_view_size) | |
5304 | { | |
4d625b70 CC |
5305 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
5306 | Classify_reloc; | |
5307 | ||
6a74a719 ILT |
5308 | gold_assert(sh_type == elfcpp::SHT_RELA); |
5309 | ||
4d625b70 | 5310 | gold::relocate_relocs<size, false, Classify_reloc>( |
6a74a719 ILT |
5311 | relinfo, |
5312 | prelocs, | |
5313 | reloc_count, | |
5314 | output_section, | |
5315 | offset_in_output_section, | |
6a74a719 ILT |
5316 | view, |
5317 | view_address, | |
5318 | view_size, | |
5319 | reloc_view, | |
5320 | reloc_view_size); | |
5321 | } | |
5322 | ||
4fb6c25d ILT |
5323 | // Return the value to use for a dynamic which requires special |
5324 | // treatment. This is how we support equality comparisons of function | |
5325 | // pointers across shared library boundaries, as described in the | |
5326 | // processor specific ABI supplement. | |
5327 | ||
fc51264f | 5328 | template<int size> |
4fb6c25d | 5329 | uint64_t |
fc51264f | 5330 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
5331 | { |
5332 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 5333 | return this->plt_address_for_global(gsym); |
4fb6c25d ILT |
5334 | } |
5335 | ||
2e30d253 ILT |
5336 | // Return a string used to fill a code section with nops to take up |
5337 | // the specified length. | |
5338 | ||
fc51264f | 5339 | template<int size> |
2e30d253 | 5340 | std::string |
fc51264f | 5341 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
5342 | { |
5343 | if (length >= 16) | |
5344 | { | |
5345 | // Build a jmpq instruction to skip over the bytes. | |
5346 | unsigned char jmp[5]; | |
5347 | jmp[0] = 0xe9; | |
04bf7072 | 5348 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 | 5349 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2e702c99 | 5350 | + std::string(length - 5, static_cast<char>(0x90))); |
2e30d253 ILT |
5351 | } |
5352 | ||
5353 | // Nop sequences of various lengths. | |
76677ad0 CC |
5354 | const char nop1[1] = { '\x90' }; // nop |
5355 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
5356 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
5357 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
2e702c99 | 5358 | '\x00'}; |
76677ad0 CC |
5359 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) |
5360 | '\x00', '\x00' }; | |
5361 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
2e702c99 | 5362 | '\x44', '\x00', '\x00' }; |
76677ad0 | 5363 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) |
2e702c99 | 5364 | '\x00', '\x00', '\x00', |
76677ad0 CC |
5365 | '\x00' }; |
5366 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
2e702c99 | 5367 | '\x00', '\x00', '\x00', |
76677ad0 CC |
5368 | '\x00', '\x00' }; |
5369 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
2e702c99 | 5370 | '\x84', '\x00', '\x00', |
76677ad0 CC |
5371 | '\x00', '\x00', '\x00' }; |
5372 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
2e702c99 | 5373 | '\x1f', '\x84', '\x00', |
76677ad0 CC |
5374 | '\x00', '\x00', '\x00', |
5375 | '\x00' }; | |
5376 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
2e702c99 | 5377 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
5378 | '\x00', '\x00', '\x00', |
5379 | '\x00', '\x00' }; | |
5380 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
2e702c99 | 5381 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
5382 | '\x84', '\x00', '\x00', |
5383 | '\x00', '\x00', '\x00' }; | |
5384 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
2e702c99 | 5385 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
5386 | '\x1f', '\x84', '\x00', |
5387 | '\x00', '\x00', '\x00', | |
2e702c99 | 5388 | '\x00' }; |
76677ad0 | 5389 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 5390 | '\x66', '\x66', '\x2e', // data16 |
76677ad0 CC |
5391 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
5392 | '\x00', '\x00', '\x00', | |
2e702c99 | 5393 | '\x00', '\x00' }; |
76677ad0 | 5394 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 5395 | '\x66', '\x66', '\x66', // data16; data16 |
76677ad0 CC |
5396 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
5397 | '\x84', '\x00', '\x00', | |
2e702c99 | 5398 | '\x00', '\x00', '\x00' }; |
2e30d253 ILT |
5399 | |
5400 | const char* nops[16] = { | |
5401 | NULL, | |
5402 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
5403 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
5404 | }; | |
5405 | ||
5406 | return std::string(nops[length], length); | |
5407 | } | |
5408 | ||
e291e7b9 ILT |
5409 | // Return the addend to use for a target specific relocation. The |
5410 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
5411 | // symbol. We want to set the addend is the offset of the local | |
5412 | // symbol in the TLS segment. | |
5413 | ||
fc51264f | 5414 | template<int size> |
e291e7b9 | 5415 | uint64_t |
fc51264f L |
5416 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
5417 | uint64_t) const | |
e291e7b9 ILT |
5418 | { |
5419 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
5420 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
5421 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
5422 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 5423 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
5424 | gold_assert(psymval->is_tls_symbol()); |
5425 | // The value of a TLS symbol is the offset in the TLS segment. | |
5426 | return psymval->value(ti.object, 0); | |
5427 | } | |
5428 | ||
02d7cd44 ILT |
5429 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
5430 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
5431 | // assembler can not write out the difference between two labels in | |
5432 | // different sections, so instead of using a pc-relative value they | |
5433 | // use an offset from the GOT. | |
5434 | ||
fc51264f | 5435 | template<int size> |
02d7cd44 | 5436 | uint64_t |
fc51264f | 5437 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
5438 | { |
5439 | gold_assert(this->global_offset_table_ != NULL); | |
5440 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 5441 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
5442 | return ssym->value(); |
5443 | } | |
5444 | ||
364c7fa5 | 5445 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 5446 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
5447 | // code. We have to change the function so that it always ensures |
5448 | // that it has enough stack space to run some random function. | |
5449 | ||
4fc1b9d4 L |
5450 | static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 }; |
5451 | static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 }; | |
5452 | static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 }; | |
5453 | ||
5454 | static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 }; | |
5455 | static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 }; | |
5456 | static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 }; | |
5457 | ||
fc51264f | 5458 | template<int size> |
364c7fa5 | 5459 | void |
fc51264f L |
5460 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
5461 | section_offset_type fnoffset, | |
5462 | section_size_type fnsize, | |
6e0813d3 CC |
5463 | const unsigned char*, |
5464 | size_t, | |
fc51264f L |
5465 | unsigned char* view, |
5466 | section_size_type view_size, | |
5467 | std::string* from, | |
5468 | std::string* to) const | |
364c7fa5 | 5469 | { |
4fc1b9d4 L |
5470 | const char* const cmp_insn = reinterpret_cast<const char*> |
5471 | (size == 32 ? cmp_insn_32 : cmp_insn_64); | |
5472 | const char* const lea_r10_insn = reinterpret_cast<const char*> | |
5473 | (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64); | |
5474 | const char* const lea_r11_insn = reinterpret_cast<const char*> | |
5475 | (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64); | |
5476 | ||
5477 | const size_t cmp_insn_len = | |
5478 | (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64)); | |
5479 | const size_t lea_r10_insn_len = | |
5480 | (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64)); | |
5481 | const size_t lea_r11_insn_len = | |
5482 | (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64)); | |
5483 | const size_t nop_len = (size == 32 ? 7 : 8); | |
5484 | ||
364c7fa5 ILT |
5485 | // The function starts with a comparison of the stack pointer and a |
5486 | // field in the TCB. This is followed by a jump. | |
5487 | ||
5488 | // cmp %fs:NN,%rsp | |
4fc1b9d4 L |
5489 | if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len) |
5490 | && fnsize > nop_len + 1) | |
364c7fa5 ILT |
5491 | { |
5492 | // We will call __morestack if the carry flag is set after this | |
5493 | // comparison. We turn the comparison into an stc instruction | |
5494 | // and some nops. | |
5495 | view[fnoffset] = '\xf9'; | |
4fc1b9d4 | 5496 | this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len); |
364c7fa5 ILT |
5497 | } |
5498 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
5499 | // lea NN(%rsp),%r11 |
5500 | else if ((this->match_view(view, view_size, fnoffset, | |
4fc1b9d4 | 5501 | lea_r10_insn, lea_r10_insn_len) |
cbc999b9 | 5502 | || this->match_view(view, view_size, fnoffset, |
4fc1b9d4 | 5503 | lea_r11_insn, lea_r11_insn_len)) |
364c7fa5 ILT |
5504 | && fnsize > 8) |
5505 | { | |
5506 | // This is loading an offset from the stack pointer for a | |
5507 | // comparison. The offset is negative, so we decrease the | |
5508 | // offset by the amount of space we need for the stack. This | |
5509 | // means we will avoid calling __morestack if there happens to | |
5510 | // be plenty of space on the stack already. | |
5511 | unsigned char* pval = view + fnoffset + 4; | |
5512 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
5513 | val -= parameters->options().split_stack_adjust_size(); | |
5514 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
5515 | } | |
5516 | else | |
5517 | { | |
5518 | if (!object->has_no_split_stack()) | |
5519 | object->error(_("failed to match split-stack sequence at " | |
5520 | "section %u offset %0zx"), | |
ac33a407 | 5521 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
5522 | return; |
5523 | } | |
5524 | ||
5525 | // We have to change the function so that it calls | |
5526 | // __morestack_non_split instead of __morestack. The former will | |
5527 | // allocate additional stack space. | |
5528 | *from = "__morestack"; | |
5529 | *to = "__morestack_non_split"; | |
5530 | } | |
5531 | ||
2e702c99 RM |
5532 | // The selector for x86_64 object files. Note this is never instantiated |
5533 | // directly. It's only used in Target_selector_x86_64_nacl, below. | |
2e30d253 | 5534 | |
fc51264f | 5535 | template<int size> |
36959681 | 5536 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
5537 | { |
5538 | public: | |
5539 | Target_selector_x86_64() | |
fc51264f | 5540 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
2e702c99 | 5541 | (size == 64 |
fc51264f | 5542 | ? "elf64-x86-64" : "elf32-x86-64"), |
2e702c99 | 5543 | (size == 64 |
fc51264f L |
5544 | ? "elf64-x86-64-freebsd" |
5545 | : "elf32-x86-64-freebsd"), | |
5546 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
5547 | { } |
5548 | ||
5549 | Target* | |
e96caa79 | 5550 | do_instantiate_target() |
fc51264f | 5551 | { return new Target_x86_64<size>(); } |
36959681 | 5552 | |
2e30d253 ILT |
5553 | }; |
5554 | ||
2e702c99 RM |
5555 | // NaCl variant. It uses different PLT contents. |
5556 | ||
5557 | template<int size> | |
5558 | class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size> | |
5559 | { | |
5560 | public: | |
5561 | Output_data_plt_x86_64_nacl(Layout* layout, | |
5562 | Output_data_got<64, false>* got, | |
57b2284c | 5563 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5564 | Output_data_space* got_irelative) |
5565 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
5566 | got, got_plt, got_irelative) | |
5567 | { } | |
5568 | ||
5569 | Output_data_plt_x86_64_nacl(Layout* layout, | |
5570 | Output_data_got<64, false>* got, | |
57b2284c | 5571 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5572 | Output_data_space* got_irelative, |
5573 | unsigned int plt_count) | |
5574 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
5575 | got, got_plt, got_irelative, | |
5576 | plt_count) | |
5577 | { } | |
5578 | ||
5579 | protected: | |
5580 | virtual unsigned int | |
5581 | do_get_plt_entry_size() const | |
5582 | { return plt_entry_size; } | |
5583 | ||
5584 | virtual void | |
5585 | do_add_eh_frame(Layout* layout) | |
5586 | { | |
5587 | layout->add_eh_frame_for_plt(this, | |
5588 | this->plt_eh_frame_cie, | |
5589 | this->plt_eh_frame_cie_size, | |
5590 | plt_eh_frame_fde, | |
5591 | plt_eh_frame_fde_size); | |
5592 | } | |
5593 | ||
5594 | virtual void | |
5595 | do_fill_first_plt_entry(unsigned char* pov, | |
5596 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
5597 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
5598 | ||
5599 | virtual unsigned int | |
5600 | do_fill_plt_entry(unsigned char* pov, | |
5601 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5602 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5603 | unsigned int got_offset, | |
5604 | unsigned int plt_offset, | |
5605 | unsigned int plt_index); | |
5606 | ||
5607 | virtual void | |
5608 | do_fill_tlsdesc_entry(unsigned char* pov, | |
5609 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5610 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5611 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
5612 | unsigned int tlsdesc_got_offset, | |
5613 | unsigned int plt_offset); | |
5614 | ||
5615 | private: | |
5616 | // The size of an entry in the PLT. | |
5617 | static const int plt_entry_size = 64; | |
5618 | ||
5619 | // The first entry in the PLT. | |
5620 | static const unsigned char first_plt_entry[plt_entry_size]; | |
5621 | ||
5622 | // Other entries in the PLT for an executable. | |
5623 | static const unsigned char plt_entry[plt_entry_size]; | |
5624 | ||
5625 | // The reserved TLSDESC entry in the PLT for an executable. | |
5626 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
5627 | ||
5628 | // The .eh_frame unwind information for the PLT. | |
5629 | static const int plt_eh_frame_fde_size = 32; | |
5630 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
5631 | }; | |
5632 | ||
5633 | template<int size> | |
5634 | class Target_x86_64_nacl : public Target_x86_64<size> | |
5635 | { | |
5636 | public: | |
5637 | Target_x86_64_nacl() | |
5638 | : Target_x86_64<size>(&x86_64_nacl_info) | |
5639 | { } | |
5640 | ||
5641 | virtual Output_data_plt_x86_64<size>* | |
5642 | do_make_data_plt(Layout* layout, | |
5643 | Output_data_got<64, false>* got, | |
57b2284c | 5644 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5645 | Output_data_space* got_irelative) |
5646 | { | |
5647 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
5648 | got_irelative); | |
5649 | } | |
5650 | ||
5651 | virtual Output_data_plt_x86_64<size>* | |
5652 | do_make_data_plt(Layout* layout, | |
5653 | Output_data_got<64, false>* got, | |
57b2284c | 5654 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
5655 | Output_data_space* got_irelative, |
5656 | unsigned int plt_count) | |
5657 | { | |
5658 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
5659 | got_irelative, | |
5660 | plt_count); | |
5661 | } | |
5662 | ||
93f8221c RM |
5663 | virtual std::string |
5664 | do_code_fill(section_size_type length) const; | |
5665 | ||
2e702c99 RM |
5666 | private: |
5667 | static const Target::Target_info x86_64_nacl_info; | |
5668 | }; | |
5669 | ||
5670 | template<> | |
5671 | const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info = | |
5672 | { | |
5673 | 64, // size | |
5674 | false, // is_big_endian | |
5675 | elfcpp::EM_X86_64, // machine_code | |
5676 | false, // has_make_symbol | |
5677 | false, // has_resolve | |
5678 | true, // has_code_fill | |
5679 | true, // is_default_stack_executable | |
5680 | true, // can_icf_inline_merge_sections | |
5681 | '\0', // wrap_char | |
5682 | "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker | |
5683 | 0x20000, // default_text_segment_address | |
5684 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
5685 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
5686 | true, // isolate_execinstr | |
5687 | 0x10000000, // rosegment_gap | |
5688 | elfcpp::SHN_UNDEF, // small_common_shndx | |
5689 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
5690 | 0, // small_common_section_flags | |
5691 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
5692 | NULL, // attributes_section | |
a67858e0 | 5693 | NULL, // attributes_vendor |
8d9743bd MK |
5694 | "_start", // entry_symbol_name |
5695 | 32, // hash_entry_size | |
bce5a025 | 5696 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
2e702c99 RM |
5697 | }; |
5698 | ||
5699 | template<> | |
5700 | const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info = | |
5701 | { | |
5702 | 32, // size | |
5703 | false, // is_big_endian | |
5704 | elfcpp::EM_X86_64, // machine_code | |
5705 | false, // has_make_symbol | |
5706 | false, // has_resolve | |
5707 | true, // has_code_fill | |
5708 | true, // is_default_stack_executable | |
5709 | true, // can_icf_inline_merge_sections | |
5710 | '\0', // wrap_char | |
5711 | "/lib/ld-nacl-x86-64.so.1", // dynamic_linker | |
5712 | 0x20000, // default_text_segment_address | |
5713 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
5714 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
5715 | true, // isolate_execinstr | |
5716 | 0x10000000, // rosegment_gap | |
5717 | elfcpp::SHN_UNDEF, // small_common_shndx | |
5718 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
5719 | 0, // small_common_section_flags | |
5720 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
5721 | NULL, // attributes_section | |
a67858e0 | 5722 | NULL, // attributes_vendor |
8d9743bd MK |
5723 | "_start", // entry_symbol_name |
5724 | 32, // hash_entry_size | |
bce5a025 | 5725 | elfcpp::SHT_X86_64_UNWIND, // unwind_section_type |
2e702c99 RM |
5726 | }; |
5727 | ||
5728 | #define NACLMASK 0xe0 // 32-byte alignment mask. | |
5729 | ||
5730 | // The first entry in the PLT. | |
5731 | ||
5732 | template<int size> | |
5733 | const unsigned char | |
5734 | Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] = | |
5735 | { | |
5736 | 0xff, 0x35, // pushq contents of memory address | |
5737 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
5738 | 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11 | |
5739 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
5740 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
5741 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
5742 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
5743 | ||
5744 | // 9-byte nop sequence to pad out to the next 32-byte boundary. | |
dd0845d7 | 5745 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1) |
2e702c99 RM |
5746 | |
5747 | // 32 bytes of nop to pad out to the standard size | |
5748 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5749 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5750 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5751 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5752 | 0x66, // excess data32 prefix | |
5753 | 0x90 // nop | |
5754 | }; | |
5755 | ||
5756 | template<int size> | |
5757 | void | |
5758 | Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry( | |
5759 | unsigned char* pov, | |
5760 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5761 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
5762 | { | |
5763 | memcpy(pov, first_plt_entry, plt_entry_size); | |
5764 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
5765 | (got_address + 8 | |
5766 | - (plt_address + 2 + 4))); | |
5767 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
5768 | (got_address + 16 | |
5769 | - (plt_address + 9 + 4))); | |
5770 | } | |
5771 | ||
5772 | // Subsequent entries in the PLT. | |
5773 | ||
5774 | template<int size> | |
5775 | const unsigned char | |
5776 | Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] = | |
5777 | { | |
5778 | 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11 | |
5779 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
5780 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
5781 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
5782 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
5783 | ||
5784 | // 15-byte nop sequence to pad out to the next 32-byte boundary. | |
5785 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5786 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5787 | ||
5788 | // Lazy GOT entries point here (32-byte aligned). | |
5789 | 0x68, // pushq immediate | |
5790 | 0, 0, 0, 0, // replaced with index into relocation table | |
5791 | 0xe9, // jmp relative | |
5792 | 0, 0, 0, 0, // replaced with offset to start of .plt0 | |
5793 | ||
5794 | // 22 bytes of nop to pad out to the standard size. | |
5795 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5796 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5797 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax) | |
5798 | }; | |
5799 | ||
5800 | template<int size> | |
5801 | unsigned int | |
5802 | Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry( | |
5803 | unsigned char* pov, | |
5804 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5805 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5806 | unsigned int got_offset, | |
5807 | unsigned int plt_offset, | |
5808 | unsigned int plt_index) | |
5809 | { | |
5810 | memcpy(pov, plt_entry, plt_entry_size); | |
5811 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, | |
5812 | (got_address + got_offset | |
5813 | - (plt_address + plt_offset | |
5814 | + 3 + 4))); | |
5815 | ||
5816 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index); | |
5817 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 38, | |
5818 | - (plt_offset + 38 + 4)); | |
5819 | ||
5820 | return 32; | |
5821 | } | |
5822 | ||
5823 | // The reserved TLSDESC entry in the PLT. | |
5824 | ||
5825 | template<int size> | |
5826 | const unsigned char | |
5827 | Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] = | |
5828 | { | |
5829 | 0xff, 0x35, // pushq x(%rip) | |
5830 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
5831 | 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11 | |
5832 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
5833 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
5834 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
5835 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
5836 | ||
5837 | // 41 bytes of nop to pad out to the standard size. | |
5838 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5839 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5840 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
5841 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5842 | 0x66, 0x66, // excess data32 prefixes | |
5843 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
5844 | }; | |
5845 | ||
5846 | template<int size> | |
5847 | void | |
5848 | Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry( | |
5849 | unsigned char* pov, | |
5850 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
5851 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
5852 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
5853 | unsigned int tlsdesc_got_offset, | |
5854 | unsigned int plt_offset) | |
5855 | { | |
5856 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
5857 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
5858 | (got_address + 8 | |
5859 | - (plt_address + plt_offset | |
5860 | + 2 + 4))); | |
5861 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
5862 | (got_base | |
5863 | + tlsdesc_got_offset | |
5864 | - (plt_address + plt_offset | |
5865 | + 9 + 4))); | |
5866 | } | |
5867 | ||
5868 | // The .eh_frame unwind information for the PLT. | |
5869 | ||
5870 | template<int size> | |
5871 | const unsigned char | |
5872 | Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
5873 | { | |
5874 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
5875 | 0, 0, 0, 0, // Replaced with size of .plt. | |
5876 | 0, // Augmentation size. | |
5877 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
5878 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
5879 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
5880 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
5881 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
5882 | 13, // Block length. | |
5883 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
5884 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
5885 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
5886 | elfcpp::DW_OP_and, // & (%rip & 0x3f). | |
5887 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
5888 | elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25) | |
5889 | elfcpp::DW_OP_lit3, // Push 3. | |
5890 | elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3) | |
5891 | elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8 | |
5892 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
5893 | elfcpp::DW_CFA_nop | |
5894 | }; | |
5895 | ||
93f8221c RM |
5896 | // Return a string used to fill a code section with nops. |
5897 | // For NaCl, long NOPs are only valid if they do not cross | |
5898 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
5899 | template<int size> | |
5900 | std::string | |
5901 | Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const | |
5902 | { | |
5903 | return std::string(length, static_cast<char>(0x90)); | |
5904 | } | |
5905 | ||
2e702c99 RM |
5906 | // The selector for x86_64-nacl object files. |
5907 | ||
5908 | template<int size> | |
5909 | class Target_selector_x86_64_nacl | |
5910 | : public Target_selector_nacl<Target_selector_x86_64<size>, | |
5911 | Target_x86_64_nacl<size> > | |
5912 | { | |
5913 | public: | |
5914 | Target_selector_x86_64_nacl() | |
5915 | : Target_selector_nacl<Target_selector_x86_64<size>, | |
5916 | Target_x86_64_nacl<size> >("x86-64", | |
5917 | size == 64 | |
5918 | ? "elf64-x86-64-nacl" | |
5919 | : "elf32-x86-64-nacl", | |
5920 | size == 64 | |
5921 | ? "elf_x86_64_nacl" | |
5922 | : "elf32_x86_64_nacl") | |
5923 | { } | |
5924 | }; | |
5925 | ||
5926 | Target_selector_x86_64_nacl<64> target_selector_x86_64; | |
5927 | Target_selector_x86_64_nacl<32> target_selector_x32; | |
2e30d253 ILT |
5928 | |
5929 | } // End anonymous namespace. |