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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
6f2750fe | 3 | // Copyright (C) 2006-2016 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 | ||
7223e9ca ILT |
182 | // Return the number of PLT entries. |
183 | unsigned int | |
184 | entry_count() const | |
67181c72 | 185 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
186 | |
187 | // Return the offset of the first non-reserved PLT entry. | |
2e702c99 | 188 | unsigned int |
7223e9ca | 189 | first_plt_entry_offset() |
2e702c99 | 190 | { return this->get_plt_entry_size(); } |
7223e9ca ILT |
191 | |
192 | // Return the size of a PLT entry. | |
2e702c99 RM |
193 | unsigned int |
194 | get_plt_entry_size() const | |
195 | { return this->do_get_plt_entry_size(); } | |
7223e9ca | 196 | |
4829d394 CC |
197 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
198 | void | |
199 | reserve_slot(unsigned int plt_index) | |
200 | { | |
2e702c99 RM |
201 | this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(), |
202 | (plt_index + 2) * this->get_plt_entry_size()); | |
4829d394 CC |
203 | } |
204 | ||
67181c72 ILT |
205 | // Return the PLT address to use for a global symbol. |
206 | uint64_t | |
207 | address_for_global(const Symbol*); | |
208 | ||
209 | // Return the PLT address to use for a local symbol. | |
210 | uint64_t | |
211 | address_for_local(const Relobj*, unsigned int symndx); | |
212 | ||
2e702c99 RM |
213 | // Add .eh_frame information for the PLT. |
214 | void | |
215 | add_eh_frame(Layout* layout) | |
216 | { this->do_add_eh_frame(layout); } | |
217 | ||
7223e9ca | 218 | protected: |
2e702c99 RM |
219 | // Fill in the first PLT entry. |
220 | void | |
221 | fill_first_plt_entry(unsigned char* pov, | |
222 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
223 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
224 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } | |
225 | ||
226 | // Fill in a normal PLT entry. Returns the offset into the entry that | |
227 | // should be the initial GOT slot value. | |
228 | unsigned int | |
229 | fill_plt_entry(unsigned char* pov, | |
230 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
231 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
232 | unsigned int got_offset, | |
233 | unsigned int plt_offset, | |
234 | unsigned int plt_index) | |
235 | { | |
236 | return this->do_fill_plt_entry(pov, got_address, plt_address, | |
237 | got_offset, plt_offset, plt_index); | |
238 | } | |
239 | ||
240 | // Fill in the reserved TLSDESC PLT entry. | |
241 | void | |
242 | fill_tlsdesc_entry(unsigned char* pov, | |
243 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
244 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
245 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
246 | unsigned int tlsdesc_got_offset, | |
247 | unsigned int plt_offset) | |
248 | { | |
249 | this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base, | |
250 | tlsdesc_got_offset, plt_offset); | |
251 | } | |
252 | ||
253 | virtual unsigned int | |
254 | do_get_plt_entry_size() const = 0; | |
255 | ||
256 | virtual void | |
257 | do_fill_first_plt_entry(unsigned char* pov, | |
258 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
259 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr) | |
260 | = 0; | |
261 | ||
262 | virtual unsigned int | |
263 | do_fill_plt_entry(unsigned char* pov, | |
264 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
265 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
266 | unsigned int got_offset, | |
267 | unsigned int plt_offset, | |
268 | unsigned int plt_index) = 0; | |
269 | ||
270 | virtual void | |
271 | do_fill_tlsdesc_entry(unsigned char* pov, | |
272 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
273 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
274 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
275 | unsigned int tlsdesc_got_offset, | |
276 | unsigned int plt_offset) = 0; | |
277 | ||
278 | virtual void | |
279 | do_add_eh_frame(Layout* layout) = 0; | |
280 | ||
7223e9ca ILT |
281 | void |
282 | do_adjust_output_section(Output_section* os); | |
283 | ||
284 | // Write to a map file. | |
285 | void | |
286 | do_print_to_mapfile(Mapfile* mapfile) const | |
287 | { mapfile->print_output_data(this, _("** PLT")); } | |
288 | ||
2e702c99 | 289 | // The CIE of the .eh_frame unwind information for the PLT. |
07a60597 | 290 | static const int plt_eh_frame_cie_size = 16; |
07a60597 | 291 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
7223e9ca | 292 | |
2e702c99 | 293 | private: |
7223e9ca ILT |
294 | // Set the final size. |
295 | void | |
296 | set_final_data_size(); | |
297 | ||
298 | // Write out the PLT data. | |
299 | void | |
300 | do_write(Output_file*); | |
301 | ||
302 | // The reloc section. | |
303 | Reloc_section* rel_; | |
304 | // The TLSDESC relocs, if necessary. These must follow the regular | |
305 | // PLT relocs. | |
306 | Reloc_section* tlsdesc_rel_; | |
67181c72 ILT |
307 | // The IRELATIVE relocs, if necessary. These must follow the |
308 | // regular PLT relocations and the TLSDESC relocations. | |
309 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
310 | // The .got section. |
311 | Output_data_got<64, false>* got_; | |
312 | // The .got.plt section. | |
57b2284c | 313 | Output_data_got_plt_x86_64* got_plt_; |
67181c72 ILT |
314 | // The part of the .got.plt section used for IRELATIVE relocs. |
315 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
316 | // The number of PLT entries. |
317 | unsigned int count_; | |
67181c72 ILT |
318 | // Number of PLT entries with R_X86_64_IRELATIVE relocs. These |
319 | // follow the regular PLT entries. | |
320 | unsigned int irelative_count_; | |
7223e9ca ILT |
321 | // Offset of the reserved TLSDESC_GOT entry when needed. |
322 | unsigned int tlsdesc_got_offset_; | |
4829d394 CC |
323 | // List of available regions within the section, for incremental |
324 | // update links. | |
325 | Free_list free_list_; | |
7223e9ca | 326 | }; |
2e30d253 | 327 | |
2e702c99 RM |
328 | template<int size> |
329 | class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size> | |
330 | { | |
331 | public: | |
332 | Output_data_plt_x86_64_standard(Layout* layout, | |
333 | Output_data_got<64, false>* got, | |
57b2284c | 334 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
335 | Output_data_space* got_irelative) |
336 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
337 | got, got_plt, got_irelative) | |
338 | { } | |
339 | ||
340 | Output_data_plt_x86_64_standard(Layout* layout, | |
341 | Output_data_got<64, false>* got, | |
57b2284c | 342 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
343 | Output_data_space* got_irelative, |
344 | unsigned int plt_count) | |
345 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
346 | got, got_plt, got_irelative, | |
347 | plt_count) | |
348 | { } | |
349 | ||
350 | protected: | |
351 | virtual unsigned int | |
352 | do_get_plt_entry_size() const | |
353 | { return plt_entry_size; } | |
354 | ||
355 | virtual void | |
356 | do_add_eh_frame(Layout* layout) | |
357 | { | |
358 | layout->add_eh_frame_for_plt(this, | |
359 | this->plt_eh_frame_cie, | |
360 | this->plt_eh_frame_cie_size, | |
361 | plt_eh_frame_fde, | |
362 | plt_eh_frame_fde_size); | |
363 | } | |
364 | ||
365 | virtual void | |
366 | do_fill_first_plt_entry(unsigned char* pov, | |
367 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
368 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
369 | ||
370 | virtual unsigned int | |
371 | do_fill_plt_entry(unsigned char* pov, | |
372 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
373 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
374 | unsigned int got_offset, | |
375 | unsigned int plt_offset, | |
376 | unsigned int plt_index); | |
377 | ||
378 | virtual void | |
379 | do_fill_tlsdesc_entry(unsigned char* pov, | |
380 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
381 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
382 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
383 | unsigned int tlsdesc_got_offset, | |
384 | unsigned int plt_offset); | |
385 | ||
386 | private: | |
387 | // The size of an entry in the PLT. | |
388 | static const int plt_entry_size = 16; | |
389 | ||
390 | // The first entry in the PLT. | |
391 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
392 | // procedure linkage table for both programs and shared objects." | |
393 | static const unsigned char first_plt_entry[plt_entry_size]; | |
394 | ||
395 | // Other entries in the PLT for an executable. | |
396 | static const unsigned char plt_entry[plt_entry_size]; | |
397 | ||
398 | // The reserved TLSDESC entry in the PLT for an executable. | |
399 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
400 | ||
401 | // The .eh_frame unwind information for the PLT. | |
402 | static const int plt_eh_frame_fde_size = 32; | |
403 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
404 | }; | |
405 | ||
2e30d253 | 406 | // The x86_64 target class. |
d61c17ea ILT |
407 | // See the ABI at |
408 | // http://www.x86-64.org/documentation/abi.pdf | |
409 | // TLS info comes from | |
410 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 411 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 412 | |
fc51264f L |
413 | template<int size> |
414 | class Target_x86_64 : public Sized_target<size, false> | |
2e30d253 ILT |
415 | { |
416 | public: | |
e822f2b1 ILT |
417 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
418 | // uses only Elf64_Rela relocation entries with explicit addends." | |
fc51264f | 419 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
2e30d253 | 420 | |
2e702c99 RM |
421 | Target_x86_64(const Target::Target_info* info = &x86_64_info) |
422 | : Sized_target<size, false>(info), | |
67181c72 ILT |
423 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
424 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
425 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), | |
43819297 | 426 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
e291e7b9 | 427 | tls_base_symbol_defined_(false) |
2e30d253 ILT |
428 | { } |
429 | ||
8a5e3e08 ILT |
430 | // Hook for a new output section. |
431 | void | |
432 | do_new_output_section(Output_section*) const; | |
433 | ||
6d03d481 ST |
434 | // Scan the relocations to look for symbol adjustments. |
435 | void | |
ad0f2072 | 436 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
437 | Layout* layout, |
438 | Sized_relobj_file<size, false>* object, | |
439 | unsigned int data_shndx, | |
440 | unsigned int sh_type, | |
441 | const unsigned char* prelocs, | |
442 | size_t reloc_count, | |
443 | Output_section* output_section, | |
444 | bool needs_special_offset_handling, | |
445 | size_t local_symbol_count, | |
446 | const unsigned char* plocal_symbols); | |
6d03d481 | 447 | |
2e30d253 ILT |
448 | // Scan the relocations to look for symbol adjustments. |
449 | void | |
ad0f2072 | 450 | scan_relocs(Symbol_table* symtab, |
2e30d253 | 451 | Layout* layout, |
fc51264f | 452 | Sized_relobj_file<size, false>* object, |
2e30d253 ILT |
453 | unsigned int data_shndx, |
454 | unsigned int sh_type, | |
455 | const unsigned char* prelocs, | |
456 | size_t reloc_count, | |
730cdc88 ILT |
457 | Output_section* output_section, |
458 | bool needs_special_offset_handling, | |
2e30d253 | 459 | size_t local_symbol_count, |
730cdc88 | 460 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
461 | |
462 | // Finalize the sections. | |
463 | void | |
f59f41f3 | 464 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 465 | |
4fb6c25d ILT |
466 | // Return the value to use for a dynamic which requires special |
467 | // treatment. | |
468 | uint64_t | |
469 | do_dynsym_value(const Symbol*) const; | |
470 | ||
2e30d253 ILT |
471 | // Relocate a section. |
472 | void | |
fc51264f | 473 | relocate_section(const Relocate_info<size, false>*, |
2e30d253 ILT |
474 | unsigned int sh_type, |
475 | const unsigned char* prelocs, | |
476 | size_t reloc_count, | |
730cdc88 ILT |
477 | Output_section* output_section, |
478 | bool needs_special_offset_handling, | |
2e30d253 | 479 | unsigned char* view, |
fc51264f | 480 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
364c7fa5 ILT |
481 | section_size_type view_size, |
482 | const Reloc_symbol_changes*); | |
2e30d253 | 483 | |
6a74a719 ILT |
484 | // Scan the relocs during a relocatable link. |
485 | void | |
ad0f2072 | 486 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 487 | Layout* layout, |
fc51264f | 488 | Sized_relobj_file<size, false>* object, |
6a74a719 ILT |
489 | unsigned int data_shndx, |
490 | unsigned int sh_type, | |
491 | const unsigned char* prelocs, | |
492 | size_t reloc_count, | |
493 | Output_section* output_section, | |
494 | bool needs_special_offset_handling, | |
495 | size_t local_symbol_count, | |
496 | const unsigned char* plocal_symbols, | |
497 | Relocatable_relocs*); | |
498 | ||
4d625b70 CC |
499 | // Scan the relocs for --emit-relocs. |
500 | void | |
501 | emit_relocs_scan(Symbol_table* symtab, | |
502 | Layout* layout, | |
503 | Sized_relobj_file<size, false>* object, | |
504 | unsigned int data_shndx, | |
505 | unsigned int sh_type, | |
506 | const unsigned char* prelocs, | |
507 | size_t reloc_count, | |
508 | Output_section* output_section, | |
509 | bool needs_special_offset_handling, | |
510 | size_t local_symbol_count, | |
511 | const unsigned char* plocal_syms, | |
512 | Relocatable_relocs* rr); | |
513 | ||
7404fe1b | 514 | // Emit relocations for a section. |
6a74a719 | 515 | void |
7404fe1b | 516 | relocate_relocs( |
fc51264f L |
517 | const Relocate_info<size, false>*, |
518 | unsigned int sh_type, | |
519 | const unsigned char* prelocs, | |
520 | size_t reloc_count, | |
521 | Output_section* output_section, | |
62fe925a | 522 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
fc51264f L |
523 | unsigned char* view, |
524 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
525 | section_size_type view_size, | |
526 | unsigned char* reloc_view, | |
527 | section_size_type reloc_view_size); | |
6a74a719 | 528 | |
2e30d253 ILT |
529 | // Return a string used to fill a code section with nops. |
530 | std::string | |
8851ecca | 531 | do_code_fill(section_size_type length) const; |
2e30d253 | 532 | |
9a2d6984 ILT |
533 | // Return whether SYM is defined by the ABI. |
534 | bool | |
9c2d0ef9 | 535 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
536 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
537 | ||
e291e7b9 ILT |
538 | // Return the symbol index to use for a target specific relocation. |
539 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
540 | // local symbol, which is an absolute reloc. | |
541 | unsigned int | |
542 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
543 | { | |
544 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
545 | return 0; | |
546 | } | |
547 | ||
548 | // Return the addend to use for a target specific relocation. | |
549 | uint64_t | |
550 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
551 | ||
7223e9ca | 552 | // Return the PLT section. |
67181c72 ILT |
553 | uint64_t |
554 | do_plt_address_for_global(const Symbol* gsym) const | |
555 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 556 | |
67181c72 ILT |
557 | uint64_t |
558 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
559 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 560 | |
b3ce541e ILT |
561 | // This function should be defined in targets that can use relocation |
562 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
563 | // and global_reloc_may_be_function_pointer) | |
564 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
565 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
566 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
567 | bool | |
568 | do_can_check_for_function_pointers() const | |
569 | { return !parameters->options().pie(); } | |
570 | ||
02d7cd44 ILT |
571 | // Return the base for a DW_EH_PE_datarel encoding. |
572 | uint64_t | |
573 | do_ehframe_datarel_base() const; | |
574 | ||
9b547ce6 | 575 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
576 | void |
577 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
578 | section_offset_type fnoffset, section_size_type fnsize, | |
6e0813d3 | 579 | const unsigned char* prelocs, size_t reloc_count, |
364c7fa5 ILT |
580 | unsigned char* view, section_size_type view_size, |
581 | std::string* from, std::string* to) const; | |
582 | ||
96f2030e | 583 | // Return the size of the GOT section. |
fe8718a4 | 584 | section_size_type |
0e70b911 | 585 | got_size() const |
96f2030e ILT |
586 | { |
587 | gold_assert(this->got_ != NULL); | |
588 | return this->got_->data_size(); | |
589 | } | |
590 | ||
0e70b911 CC |
591 | // Return the number of entries in the GOT. |
592 | unsigned int | |
593 | got_entry_count() const | |
594 | { | |
595 | if (this->got_ == NULL) | |
596 | return 0; | |
597 | return this->got_size() / 8; | |
598 | } | |
599 | ||
600 | // Return the number of entries in the PLT. | |
601 | unsigned int | |
602 | plt_entry_count() const; | |
603 | ||
604 | // Return the offset of the first non-reserved PLT entry. | |
605 | unsigned int | |
606 | first_plt_entry_offset() const; | |
607 | ||
608 | // Return the size of each PLT entry. | |
609 | unsigned int | |
610 | plt_entry_size() const; | |
611 | ||
41e83f2b L |
612 | // Return the size of each GOT entry. |
613 | unsigned int | |
614 | got_entry_size() const | |
615 | { return 8; }; | |
616 | ||
4829d394 | 617 | // Create the GOT section for an incremental update. |
dd74ae06 | 618 | Output_data_got_base* |
4829d394 CC |
619 | init_got_plt_for_update(Symbol_table* symtab, |
620 | Layout* layout, | |
621 | unsigned int got_count, | |
622 | unsigned int plt_count); | |
623 | ||
6fa2a40b CC |
624 | // Reserve a GOT entry for a local symbol, and regenerate any |
625 | // necessary dynamic relocations. | |
626 | void | |
627 | reserve_local_got_entry(unsigned int got_index, | |
2e702c99 | 628 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
629 | unsigned int r_sym, |
630 | unsigned int got_type); | |
631 | ||
632 | // Reserve a GOT entry for a global symbol, and regenerate any | |
633 | // necessary dynamic relocations. | |
634 | void | |
635 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
636 | unsigned int got_type); | |
637 | ||
4829d394 | 638 | // Register an existing PLT entry for a global symbol. |
4829d394 | 639 | void |
67181c72 ILT |
640 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
641 | Symbol* gsym); | |
4829d394 | 642 | |
26d3c67d CC |
643 | // Force a COPY relocation for a given symbol. |
644 | void | |
645 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
646 | ||
94a3fc8b CC |
647 | // Apply an incremental relocation. |
648 | void | |
fc51264f L |
649 | apply_relocation(const Relocate_info<size, false>* relinfo, |
650 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 651 | unsigned int r_type, |
fc51264f | 652 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
653 | const Symbol* gsym, |
654 | unsigned char* view, | |
fc51264f | 655 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
656 | section_size_type view_size); |
657 | ||
e291e7b9 ILT |
658 | // Add a new reloc argument, returning the index in the vector. |
659 | size_t | |
fc51264f | 660 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
661 | { |
662 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
663 | return this->tlsdesc_reloc_info_.size() - 1; | |
664 | } | |
665 | ||
2e702c99 RM |
666 | Output_data_plt_x86_64<size>* |
667 | make_data_plt(Layout* layout, | |
668 | Output_data_got<64, false>* got, | |
57b2284c | 669 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
670 | Output_data_space* got_irelative) |
671 | { | |
672 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); | |
673 | } | |
674 | ||
675 | Output_data_plt_x86_64<size>* | |
676 | make_data_plt(Layout* layout, | |
677 | Output_data_got<64, false>* got, | |
57b2284c | 678 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
679 | Output_data_space* got_irelative, |
680 | unsigned int plt_count) | |
681 | { | |
682 | return this->do_make_data_plt(layout, got, got_plt, got_irelative, | |
683 | plt_count); | |
684 | } | |
685 | ||
686 | virtual Output_data_plt_x86_64<size>* | |
687 | do_make_data_plt(Layout* layout, | |
688 | Output_data_got<64, false>* got, | |
57b2284c | 689 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
690 | Output_data_space* got_irelative) |
691 | { | |
692 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
693 | got_irelative); | |
694 | } | |
695 | ||
696 | virtual Output_data_plt_x86_64<size>* | |
697 | do_make_data_plt(Layout* layout, | |
698 | Output_data_got<64, false>* got, | |
57b2284c | 699 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
700 | Output_data_space* got_irelative, |
701 | unsigned int plt_count) | |
702 | { | |
703 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
704 | got_irelative, | |
705 | plt_count); | |
706 | } | |
707 | ||
2e30d253 ILT |
708 | private: |
709 | // The class which scans relocations. | |
a036edd8 | 710 | class Scan |
2e30d253 | 711 | { |
a036edd8 ILT |
712 | public: |
713 | Scan() | |
714 | : issued_non_pic_error_(false) | |
715 | { } | |
716 | ||
95a2c8d6 RS |
717 | static inline int |
718 | get_reference_flags(unsigned int r_type); | |
719 | ||
2e30d253 | 720 | inline void |
ad0f2072 | 721 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 722 | Sized_relobj_file<size, false>* object, |
2e30d253 | 723 | unsigned int data_shndx, |
07f397ab | 724 | Output_section* output_section, |
fc51264f | 725 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
726 | const elfcpp::Sym<size, false>& lsym, |
727 | bool is_discarded); | |
2e30d253 ILT |
728 | |
729 | inline void | |
ad0f2072 | 730 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 731 | Sized_relobj_file<size, false>* object, |
2e30d253 | 732 | unsigned int data_shndx, |
07f397ab | 733 | Output_section* output_section, |
fc51264f | 734 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
2e30d253 | 735 | Symbol* gsym); |
e041f13d | 736 | |
21bb3914 ST |
737 | inline bool |
738 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
739 | Target_x86_64* target, | |
2e702c99 RM |
740 | Sized_relobj_file<size, false>* object, |
741 | unsigned int data_shndx, | |
742 | Output_section* output_section, | |
743 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 744 | unsigned int r_type, |
2e702c99 | 745 | const elfcpp::Sym<size, false>& lsym); |
21bb3914 ST |
746 | |
747 | inline bool | |
748 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
2e702c99 RM |
749 | Target_x86_64* target, |
750 | Sized_relobj_file<size, false>* object, | |
751 | unsigned int data_shndx, | |
752 | Output_section* output_section, | |
753 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 754 | unsigned int r_type, |
2e702c99 | 755 | Symbol* gsym); |
21bb3914 | 756 | |
a036edd8 | 757 | private: |
e041f13d | 758 | static void |
fc51264f L |
759 | unsupported_reloc_local(Sized_relobj_file<size, false>*, |
760 | unsigned int r_type); | |
e041f13d ILT |
761 | |
762 | static void | |
fc51264f L |
763 | unsupported_reloc_global(Sized_relobj_file<size, false>*, |
764 | unsigned int r_type, Symbol*); | |
a036edd8 ILT |
765 | |
766 | void | |
a29b0dad | 767 | check_non_pic(Relobj*, unsigned int r_type, Symbol*); |
a036edd8 | 768 | |
21bb3914 ST |
769 | inline bool |
770 | possible_function_pointer_reloc(unsigned int r_type); | |
771 | ||
7223e9ca | 772 | bool |
fc51264f | 773 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*, |
6fa2a40b | 774 | unsigned int r_type); |
7223e9ca | 775 | |
a036edd8 ILT |
776 | // Whether we have issued an error about a non-PIC compilation. |
777 | bool issued_non_pic_error_; | |
2e30d253 ILT |
778 | }; |
779 | ||
780 | // The class which implements relocation. | |
781 | class Relocate | |
782 | { | |
783 | public: | |
784 | Relocate() | |
36171d64 | 785 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
786 | { } |
787 | ||
788 | ~Relocate() | |
789 | { | |
790 | if (this->skip_call_tls_get_addr_) | |
791 | { | |
792 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 793 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
794 | } |
795 | } | |
796 | ||
797 | // Do a relocation. Return false if the caller should not issue | |
798 | // any warnings about this relocation. | |
799 | inline bool | |
91a65d2f AM |
800 | relocate(const Relocate_info<size, false>*, unsigned int, |
801 | Target_x86_64*, Output_section*, size_t, const unsigned char*, | |
802 | const Sized_symbol<size>*, const Symbol_value<size>*, | |
fc51264f | 803 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 804 | section_size_type); |
2e30d253 ILT |
805 | |
806 | private: | |
807 | // Do a TLS relocation. | |
808 | inline void | |
fc51264f | 809 | relocate_tls(const Relocate_info<size, false>*, Target_x86_64*, |
2e702c99 | 810 | size_t relnum, const elfcpp::Rela<size, false>&, |
fc51264f L |
811 | unsigned int r_type, const Sized_symbol<size>*, |
812 | const Symbol_value<size>*, | |
813 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 814 | section_size_type); |
2e30d253 | 815 | |
c2b45e22 | 816 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 | 817 | inline void |
fc51264f | 818 | tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
fc51264f L |
819 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
820 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
7bf1f802 | 821 | unsigned char* view, |
fc51264f | 822 | typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 823 | section_size_type view_size); |
7bf1f802 | 824 | |
56622147 ILT |
825 | // Do a TLS General-Dynamic to Local-Exec transition. |
826 | inline void | |
fc51264f | 827 | tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 828 | Output_segment* tls_segment, |
fc51264f L |
829 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
830 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 831 | unsigned char* view, |
fe8718a4 | 832 | section_size_type view_size); |
2e30d253 | 833 | |
c2b45e22 CC |
834 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
835 | inline void | |
fc51264f | 836 | tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
fc51264f L |
837 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
838 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 | 839 | unsigned char* view, |
fc51264f | 840 | typename elfcpp::Elf_types<size>::Elf_Addr, |
c2b45e22 CC |
841 | section_size_type view_size); |
842 | ||
843 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
844 | inline void | |
fc51264f | 845 | tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 846 | Output_segment* tls_segment, |
fc51264f L |
847 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
848 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 CC |
849 | unsigned char* view, |
850 | section_size_type view_size); | |
851 | ||
56622147 | 852 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 853 | inline void |
fc51264f | 854 | tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 855 | Output_segment* tls_segment, |
fc51264f L |
856 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
857 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 858 | unsigned char* view, |
fe8718a4 | 859 | section_size_type view_size); |
2e30d253 | 860 | |
56622147 ILT |
861 | // Do a TLS Initial-Exec to Local-Exec transition. |
862 | static inline void | |
fc51264f | 863 | tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum, |
72ec2876 | 864 | Output_segment* tls_segment, |
fc51264f L |
865 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
866 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
72ec2876 | 867 | unsigned char* view, |
fe8718a4 | 868 | section_size_type view_size); |
2e30d253 ILT |
869 | |
870 | // This is set if we should skip the next reloc, which should be a | |
871 | // PLT32 reloc against ___tls_get_addr. | |
872 | bool skip_call_tls_get_addr_; | |
873 | }; | |
874 | ||
1fa29f10 IT |
875 | // Check if relocation against this symbol is a candidate for |
876 | // conversion from | |
877 | // mov foo@GOTPCREL(%rip), %reg | |
878 | // to lea foo(%rip), %reg. | |
879 | static bool | |
880 | can_convert_mov_to_lea(const Symbol* gsym) | |
881 | { | |
882 | gold_assert(gsym != NULL); | |
883 | return (gsym->type() != elfcpp::STT_GNU_IFUNC | |
884 | && !gsym->is_undefined () | |
885 | && !gsym->is_from_dynobj() | |
886 | && !gsym->is_preemptible() | |
887 | && (!parameters->options().shared() | |
888 | || (gsym->visibility() != elfcpp::STV_DEFAULT | |
889 | && gsym->visibility() != elfcpp::STV_PROTECTED) | |
890 | || parameters->options().Bsymbolic()) | |
891 | && strcmp(gsym->name(), "_DYNAMIC") != 0); | |
892 | } | |
893 | ||
2e30d253 ILT |
894 | // Adjust TLS relocation type based on the options and whether this |
895 | // is a local symbol. | |
e041f13d | 896 | static tls::Tls_optimization |
2e30d253 ILT |
897 | optimize_tls_reloc(bool is_final, int r_type); |
898 | ||
899 | // Get the GOT section, creating it if necessary. | |
900 | Output_data_got<64, false>* | |
901 | got_section(Symbol_table*, Layout*); | |
902 | ||
96f2030e | 903 | // Get the GOT PLT section. |
57b2284c | 904 | Output_data_got_plt_x86_64* |
96f2030e ILT |
905 | got_plt_section() const |
906 | { | |
907 | gold_assert(this->got_plt_ != NULL); | |
908 | return this->got_plt_; | |
909 | } | |
910 | ||
a8df5856 ILT |
911 | // Get the GOT section for TLSDESC entries. |
912 | Output_data_got<64, false>* | |
913 | got_tlsdesc_section() const | |
914 | { | |
915 | gold_assert(this->got_tlsdesc_ != NULL); | |
916 | return this->got_tlsdesc_; | |
917 | } | |
918 | ||
c2b45e22 CC |
919 | // Create the PLT section. |
920 | void | |
921 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
922 | ||
2e30d253 ILT |
923 | // Create a PLT entry for a global symbol. |
924 | void | |
925 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
926 | ||
7223e9ca ILT |
927 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
928 | void | |
929 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
fc51264f | 930 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
931 | unsigned int local_sym_index); |
932 | ||
9fa33bee | 933 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
934 | void |
935 | define_tls_base_symbol(Symbol_table*, Layout*); | |
936 | ||
c2b45e22 CC |
937 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
938 | void | |
939 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
940 | ||
31d60480 ILT |
941 | // Create a GOT entry for the TLS module index. |
942 | unsigned int | |
943 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
fc51264f | 944 | Sized_relobj_file<size, false>* object); |
31d60480 | 945 | |
2e30d253 | 946 | // Get the PLT section. |
fc51264f | 947 | Output_data_plt_x86_64<size>* |
2e30d253 ILT |
948 | plt_section() const |
949 | { | |
950 | gold_assert(this->plt_ != NULL); | |
951 | return this->plt_; | |
952 | } | |
953 | ||
954 | // Get the dynamic reloc section, creating it if necessary. | |
955 | Reloc_section* | |
0ffd9845 | 956 | rela_dyn_section(Layout*); |
2e30d253 | 957 | |
e291e7b9 ILT |
958 | // Get the section to use for TLSDESC relocations. |
959 | Reloc_section* | |
960 | rela_tlsdesc_section(Layout*) const; | |
961 | ||
67181c72 ILT |
962 | // Get the section to use for IRELATIVE relocations. |
963 | Reloc_section* | |
964 | rela_irelative_section(Layout*); | |
965 | ||
12c0daef | 966 | // Add a potential copy relocation. |
2e30d253 | 967 | void |
ef9beddf | 968 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 969 | Sized_relobj_file<size, false>* object, |
12c0daef | 970 | unsigned int shndx, Output_section* output_section, |
fc51264f | 971 | Symbol* sym, const elfcpp::Rela<size, false>& reloc) |
12c0daef | 972 | { |
859d7987 | 973 | unsigned int r_type = elfcpp::elf_r_type<size>(reloc.get_r_info()); |
12c0daef | 974 | this->copy_relocs_.copy_reloc(symtab, layout, |
fc51264f | 975 | symtab->get_sized_symbol<size>(sym), |
12c0daef | 976 | object, shndx, output_section, |
859d7987 CC |
977 | r_type, reloc.get_r_offset(), |
978 | reloc.get_r_addend(), | |
979 | this->rela_dyn_section(layout)); | |
12c0daef | 980 | } |
2e30d253 ILT |
981 | |
982 | // Information about this specific target which we pass to the | |
983 | // general Target structure. | |
984 | static const Target::Target_info x86_64_info; | |
985 | ||
0e70b911 CC |
986 | // The types of GOT entries needed for this platform. |
987 | // These values are exposed to the ABI in an incremental link. | |
988 | // Do not renumber existing values without changing the version | |
989 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
990 | enum Got_type |
991 | { | |
992 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
993 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
994 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
995 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
996 | }; | |
997 | ||
e291e7b9 ILT |
998 | // This type is used as the argument to the target specific |
999 | // relocation routines. The only target specific reloc is | |
1000 | // R_X86_64_TLSDESC against a local symbol. | |
1001 | struct Tlsdesc_info | |
1002 | { | |
fc51264f | 1003 | Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym) |
e291e7b9 ILT |
1004 | : object(a_object), r_sym(a_r_sym) |
1005 | { } | |
1006 | ||
1007 | // The object in which the local symbol is defined. | |
fc51264f | 1008 | Sized_relobj_file<size, false>* object; |
e291e7b9 ILT |
1009 | // The local symbol index in the object. |
1010 | unsigned int r_sym; | |
1011 | }; | |
1012 | ||
2e30d253 ILT |
1013 | // The GOT section. |
1014 | Output_data_got<64, false>* got_; | |
1015 | // The PLT section. | |
fc51264f | 1016 | Output_data_plt_x86_64<size>* plt_; |
2e30d253 | 1017 | // The GOT PLT section. |
57b2284c | 1018 | Output_data_got_plt_x86_64* got_plt_; |
67181c72 ILT |
1019 | // The GOT section for IRELATIVE relocations. |
1020 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
1021 | // The GOT section for TLSDESC relocations. |
1022 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
1023 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
1024 | Symbol* global_offset_table_; | |
2e30d253 | 1025 | // The dynamic reloc section. |
0ffd9845 | 1026 | Reloc_section* rela_dyn_; |
67181c72 ILT |
1027 | // The section to use for IRELATIVE relocs. |
1028 | Reloc_section* rela_irelative_; | |
2e30d253 | 1029 | // Relocs saved to avoid a COPY reloc. |
fc51264f | 1030 | Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_; |
c2b45e22 | 1031 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 1032 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
1033 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
1034 | // specific relocation. Here we store the object and local symbol | |
1035 | // index for the relocation. | |
1036 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
1037 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
1038 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
1039 | }; |
1040 | ||
fc51264f L |
1041 | template<> |
1042 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
1043 | { |
1044 | 64, // size | |
1045 | false, // is_big_endian | |
1046 | elfcpp::EM_X86_64, // machine_code | |
1047 | false, // has_make_symbol | |
1048 | false, // has_resolve | |
1049 | true, // has_code_fill | |
35cdfc9a | 1050 | true, // is_default_stack_executable |
b3ce541e | 1051 | true, // can_icf_inline_merge_sections |
0864d551 | 1052 | '\0', // wrap_char |
2e30d253 | 1053 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 1054 | 0x400000, // default_text_segment_address |
cd72c291 | 1055 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 1056 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
1057 | false, // isolate_execinstr |
1058 | 0, // rosegment_gap | |
8a5e3e08 ILT |
1059 | elfcpp::SHN_UNDEF, // small_common_shndx |
1060 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1061 | 0, // small_common_section_flags | |
05a352e6 DK |
1062 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
1063 | NULL, // attributes_section | |
a67858e0 | 1064 | NULL, // attributes_vendor |
8d9743bd MK |
1065 | "_start", // entry_symbol_name |
1066 | 32, // hash_entry_size | |
2e30d253 ILT |
1067 | }; |
1068 | ||
fc51264f L |
1069 | template<> |
1070 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
1071 | { | |
1072 | 32, // size | |
1073 | false, // is_big_endian | |
1074 | elfcpp::EM_X86_64, // machine_code | |
1075 | false, // has_make_symbol | |
1076 | false, // has_resolve | |
1077 | true, // has_code_fill | |
1078 | true, // is_default_stack_executable | |
1079 | true, // can_icf_inline_merge_sections | |
1080 | '\0', // wrap_char | |
1081 | "/libx32/ldx32.so.1", // program interpreter | |
1082 | 0x400000, // default_text_segment_address | |
1083 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
1084 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2e702c99 RM |
1085 | false, // isolate_execinstr |
1086 | 0, // rosegment_gap | |
fc51264f L |
1087 | elfcpp::SHN_UNDEF, // small_common_shndx |
1088 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1089 | 0, // small_common_section_flags | |
1090 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
1091 | NULL, // attributes_section | |
a67858e0 | 1092 | NULL, // attributes_vendor |
8d9743bd MK |
1093 | "_start", // entry_symbol_name |
1094 | 32, // hash_entry_size | |
fc51264f L |
1095 | }; |
1096 | ||
8a5e3e08 ILT |
1097 | // This is called when a new output section is created. This is where |
1098 | // we handle the SHF_X86_64_LARGE. | |
1099 | ||
fc51264f | 1100 | template<int size> |
8a5e3e08 | 1101 | void |
fc51264f | 1102 | Target_x86_64<size>::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
1103 | { |
1104 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
1105 | os->set_is_large_section(); | |
1106 | } | |
1107 | ||
2e30d253 ILT |
1108 | // Get the GOT section, creating it if necessary. |
1109 | ||
fc51264f | 1110 | template<int size> |
2e30d253 | 1111 | Output_data_got<64, false>* |
fc51264f | 1112 | Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout) |
2e30d253 ILT |
1113 | { |
1114 | if (this->got_ == NULL) | |
1115 | { | |
1116 | gold_assert(symtab != NULL && layout != NULL); | |
1117 | ||
9446efde ILT |
1118 | // When using -z now, we can treat .got.plt as a relro section. |
1119 | // Without -z now, it is modified after program startup by lazy | |
1120 | // PLT relocations. | |
1121 | bool is_got_plt_relro = parameters->options().now(); | |
1122 | Output_section_order got_order = (is_got_plt_relro | |
1123 | ? ORDER_RELRO | |
1124 | : ORDER_RELRO_LAST); | |
1125 | Output_section_order got_plt_order = (is_got_plt_relro | |
1126 | ? ORDER_RELRO | |
1127 | : ORDER_NON_RELRO_FIRST); | |
1128 | ||
2e30d253 ILT |
1129 | this->got_ = new Output_data_got<64, false>(); |
1130 | ||
82742395 ILT |
1131 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
1132 | (elfcpp::SHF_ALLOC | |
1133 | | elfcpp::SHF_WRITE), | |
9446efde | 1134 | this->got_, got_order, true); |
2e30d253 | 1135 | |
57b2284c | 1136 | this->got_plt_ = new Output_data_got_plt_x86_64(layout); |
82742395 ILT |
1137 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1138 | (elfcpp::SHF_ALLOC | |
1139 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
1140 | this->got_plt_, got_plt_order, |
1141 | is_got_plt_relro); | |
2e30d253 ILT |
1142 | |
1143 | // The first three entries are reserved. | |
27bc2bce | 1144 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 1145 | |
9446efde ILT |
1146 | if (!is_got_plt_relro) |
1147 | { | |
1148 | // Those bytes can go into the relro segment. | |
1149 | layout->increase_relro(3 * 8); | |
1150 | } | |
1a2dff53 | 1151 | |
2e30d253 | 1152 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
1153 | this->global_offset_table_ = |
1154 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1155 | Symbol_table::PREDEFINED, | |
1156 | this->got_plt_, | |
1157 | 0, 0, elfcpp::STT_OBJECT, | |
1158 | elfcpp::STB_LOCAL, | |
1159 | elfcpp::STV_HIDDEN, 0, | |
1160 | false, false); | |
a8df5856 | 1161 | |
67181c72 ILT |
1162 | // If there are any IRELATIVE relocations, they get GOT entries |
1163 | // in .got.plt after the jump slot entries. | |
1164 | this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT"); | |
1165 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1166 | (elfcpp::SHF_ALLOC | |
1167 | | elfcpp::SHF_WRITE), | |
1168 | this->got_irelative_, | |
9446efde | 1169 | got_plt_order, is_got_plt_relro); |
67181c72 | 1170 | |
a8df5856 | 1171 | // If there are any TLSDESC relocations, they get GOT entries in |
67181c72 | 1172 | // .got.plt after the jump slot and IRELATIVE entries. |
a8df5856 ILT |
1173 | this->got_tlsdesc_ = new Output_data_got<64, false>(); |
1174 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1175 | (elfcpp::SHF_ALLOC | |
1176 | | elfcpp::SHF_WRITE), | |
22f0da72 | 1177 | this->got_tlsdesc_, |
9446efde | 1178 | got_plt_order, is_got_plt_relro); |
2e30d253 ILT |
1179 | } |
1180 | ||
1181 | return this->got_; | |
1182 | } | |
1183 | ||
1184 | // Get the dynamic reloc section, creating it if necessary. | |
1185 | ||
fc51264f L |
1186 | template<int size> |
1187 | typename Target_x86_64<size>::Reloc_section* | |
1188 | Target_x86_64<size>::rela_dyn_section(Layout* layout) | |
2e30d253 | 1189 | { |
0ffd9845 | 1190 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
1191 | { |
1192 | gold_assert(layout != NULL); | |
d98bc257 | 1193 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 1194 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
1195 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
1196 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 1197 | } |
0ffd9845 | 1198 | return this->rela_dyn_; |
2e30d253 ILT |
1199 | } |
1200 | ||
67181c72 ILT |
1201 | // Get the section to use for IRELATIVE relocs, creating it if |
1202 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
1203 | // relocations. They need to follow the other dynamic relocations so | |
1204 | // that they can refer to global variables initialized by those | |
1205 | // relocs. | |
1206 | ||
fc51264f L |
1207 | template<int size> |
1208 | typename Target_x86_64<size>::Reloc_section* | |
1209 | Target_x86_64<size>::rela_irelative_section(Layout* layout) | |
67181c72 ILT |
1210 | { |
1211 | if (this->rela_irelative_ == NULL) | |
1212 | { | |
1213 | // Make sure we have already created the dynamic reloc section. | |
1214 | this->rela_dyn_section(layout); | |
1215 | this->rela_irelative_ = new Reloc_section(false); | |
1216 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
1217 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
1218 | ORDER_DYNAMIC_RELOCS, false); | |
1219 | gold_assert(this->rela_dyn_->output_section() | |
1220 | == this->rela_irelative_->output_section()); | |
1221 | } | |
1222 | return this->rela_irelative_; | |
1223 | } | |
1224 | ||
57b2284c CC |
1225 | // Write the first three reserved words of the .got.plt section. |
1226 | // The remainder of the section is written while writing the PLT | |
1227 | // in Output_data_plt_i386::do_write. | |
1228 | ||
1229 | void | |
1230 | Output_data_got_plt_x86_64::do_write(Output_file* of) | |
1231 | { | |
1232 | // The first entry in the GOT is the address of the .dynamic section | |
1233 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1234 | // We saved space for them when we created the section in | |
1235 | // Target_x86_64::got_section. | |
1236 | const off_t got_file_offset = this->offset(); | |
1237 | gold_assert(this->data_size() >= 24); | |
1238 | unsigned char* const got_view = of->get_output_view(got_file_offset, 24); | |
1239 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1240 | uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1241 | elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr); | |
1242 | memset(got_view + 8, 0, 16); | |
1243 | of->write_output_view(got_file_offset, 24, got_view); | |
1244 | } | |
1245 | ||
4829d394 | 1246 | // Initialize the PLT section. |
2e30d253 | 1247 | |
fc51264f | 1248 | template<int size> |
4829d394 | 1249 | void |
fc51264f | 1250 | Output_data_plt_x86_64<size>::init(Layout* layout) |
2e30d253 | 1251 | { |
d98bc257 | 1252 | this->rel_ = new Reloc_section(false); |
2e30d253 | 1253 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
1254 | elfcpp::SHF_ALLOC, this->rel_, |
1255 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2e30d253 ILT |
1256 | } |
1257 | ||
fc51264f | 1258 | template<int size> |
2e30d253 | 1259 | void |
fc51264f | 1260 | Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os) |
2e30d253 | 1261 | { |
2e702c99 | 1262 | os->set_entsize(this->get_plt_entry_size()); |
2e30d253 ILT |
1263 | } |
1264 | ||
1265 | // Add an entry to the PLT. | |
1266 | ||
fc51264f | 1267 | template<int size> |
2e30d253 | 1268 | void |
fc51264f L |
1269 | Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout, |
1270 | Symbol* gsym) | |
2e30d253 ILT |
1271 | { |
1272 | gold_assert(!gsym->has_plt_offset()); | |
1273 | ||
4829d394 CC |
1274 | unsigned int plt_index; |
1275 | off_t plt_offset; | |
1276 | section_offset_type got_offset; | |
2e30d253 | 1277 | |
67181c72 ILT |
1278 | unsigned int* pcount; |
1279 | unsigned int offset; | |
1280 | unsigned int reserved; | |
57b2284c | 1281 | Output_section_data_build* got; |
67181c72 ILT |
1282 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1283 | && gsym->can_use_relative_reloc(false)) | |
1284 | { | |
1285 | pcount = &this->irelative_count_; | |
1286 | offset = 0; | |
1287 | reserved = 0; | |
1288 | got = this->got_irelative_; | |
1289 | } | |
1290 | else | |
1291 | { | |
1292 | pcount = &this->count_; | |
1293 | offset = 1; | |
1294 | reserved = 3; | |
1295 | got = this->got_plt_; | |
1296 | } | |
1297 | ||
4829d394 CC |
1298 | if (!this->is_data_size_valid()) |
1299 | { | |
67181c72 ILT |
1300 | // Note that when setting the PLT offset for a non-IRELATIVE |
1301 | // entry we skip the initial reserved PLT entry. | |
1302 | plt_index = *pcount + offset; | |
2e702c99 | 1303 | plt_offset = plt_index * this->get_plt_entry_size(); |
2e30d253 | 1304 | |
67181c72 | 1305 | ++*pcount; |
2e30d253 | 1306 | |
67181c72 ILT |
1307 | got_offset = (plt_index - offset + reserved) * 8; |
1308 | gold_assert(got_offset == got->current_data_size()); | |
2e30d253 | 1309 | |
4829d394 CC |
1310 | // Every PLT entry needs a GOT entry which points back to the PLT |
1311 | // entry (this will be changed by the dynamic linker, normally | |
1312 | // lazily when the function is called). | |
67181c72 | 1313 | got->set_current_data_size(got_offset + 8); |
4829d394 | 1314 | } |
7223e9ca ILT |
1315 | else |
1316 | { | |
67181c72 ILT |
1317 | // FIXME: This is probably not correct for IRELATIVE relocs. |
1318 | ||
4829d394 | 1319 | // For incremental updates, find an available slot. |
2e702c99 RM |
1320 | plt_offset = this->free_list_.allocate(this->get_plt_entry_size(), |
1321 | this->get_plt_entry_size(), 0); | |
4829d394 | 1322 | if (plt_offset == -1) |
e6455dfb CC |
1323 | gold_fallback(_("out of patch space (PLT);" |
1324 | " relink with --incremental-full")); | |
4829d394 CC |
1325 | |
1326 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
1327 | // can be calculated from the PLT index, adjusting for the three | |
1328 | // reserved entries at the beginning of the GOT. | |
2e702c99 | 1329 | plt_index = plt_offset / this->get_plt_entry_size() - 1; |
67181c72 | 1330 | got_offset = (plt_index - offset + reserved) * 8; |
7223e9ca | 1331 | } |
2e30d253 | 1332 | |
4829d394 CC |
1333 | gsym->set_plt_offset(plt_offset); |
1334 | ||
1335 | // Every PLT entry needs a reloc. | |
67181c72 | 1336 | this->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 | 1337 | |
2e30d253 ILT |
1338 | // Note that we don't need to save the symbol. The contents of the |
1339 | // PLT are independent of which symbols are used. The symbols only | |
1340 | // appear in the relocations. | |
1341 | } | |
1342 | ||
7223e9ca ILT |
1343 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1344 | // the PLT offset. | |
1345 | ||
fc51264f | 1346 | template<int size> |
7223e9ca | 1347 | unsigned int |
fc51264f | 1348 | Output_data_plt_x86_64<size>::add_local_ifunc_entry( |
67181c72 ILT |
1349 | Symbol_table* symtab, |
1350 | Layout* layout, | |
fc51264f | 1351 | Sized_relobj_file<size, false>* relobj, |
6fa2a40b | 1352 | unsigned int local_sym_index) |
7223e9ca | 1353 | { |
2e702c99 | 1354 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1355 | ++this->irelative_count_; |
7223e9ca | 1356 | |
67181c72 | 1357 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1358 | |
1359 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1360 | // entry. | |
67181c72 | 1361 | this->got_irelative_->set_current_data_size(got_offset + 8); |
7223e9ca ILT |
1362 | |
1363 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1364 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
1365 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
1366 | elfcpp::R_X86_64_IRELATIVE, | |
1367 | this->got_irelative_, got_offset, 0); | |
7223e9ca ILT |
1368 | |
1369 | return plt_offset; | |
1370 | } | |
1371 | ||
4829d394 CC |
1372 | // Add the relocation for a PLT entry. |
1373 | ||
fc51264f | 1374 | template<int size> |
4829d394 | 1375 | void |
fc51264f L |
1376 | Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab, |
1377 | Layout* layout, | |
1378 | Symbol* gsym, | |
1379 | unsigned int got_offset) | |
4829d394 CC |
1380 | { |
1381 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1382 | && gsym->can_use_relative_reloc(false)) | |
67181c72 ILT |
1383 | { |
1384 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
1385 | rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
1386 | this->got_irelative_, got_offset, 0); | |
1387 | } | |
4829d394 CC |
1388 | else |
1389 | { | |
1390 | gsym->set_needs_dynsym_entry(); | |
1391 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
1392 | got_offset, 0); | |
1393 | } | |
1394 | } | |
1395 | ||
e291e7b9 ILT |
1396 | // Return where the TLSDESC relocations should go, creating it if |
1397 | // necessary. These follow the JUMP_SLOT relocations. | |
1398 | ||
fc51264f L |
1399 | template<int size> |
1400 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1401 | Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout) | |
e291e7b9 ILT |
1402 | { |
1403 | if (this->tlsdesc_rel_ == NULL) | |
1404 | { | |
1405 | this->tlsdesc_rel_ = new Reloc_section(false); | |
1406 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1407 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 1408 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1409 | gold_assert(this->tlsdesc_rel_->output_section() |
1410 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1411 | } |
1412 | return this->tlsdesc_rel_; | |
1413 | } | |
1414 | ||
67181c72 ILT |
1415 | // Return where the IRELATIVE relocations should go in the PLT. These |
1416 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
1417 | ||
fc51264f L |
1418 | template<int size> |
1419 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1420 | Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab, | |
1421 | Layout* layout) | |
67181c72 ILT |
1422 | { |
1423 | if (this->irelative_rel_ == NULL) | |
1424 | { | |
1425 | // Make sure we have a place for the TLSDESC relocations, in | |
1426 | // case we see any later on. | |
1427 | this->rela_tlsdesc(layout); | |
1428 | this->irelative_rel_ = new Reloc_section(false); | |
1429 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1430 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1431 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1432 | gold_assert(this->irelative_rel_->output_section() | |
1433 | == this->rel_->output_section()); | |
1434 | ||
1435 | if (parameters->doing_static_link()) | |
1436 | { | |
1437 | // A statically linked executable will only have a .rela.plt | |
1438 | // section to hold R_X86_64_IRELATIVE relocs for | |
1439 | // STT_GNU_IFUNC symbols. The library will use these | |
1440 | // symbols to locate the IRELATIVE relocs at program startup | |
1441 | // time. | |
1442 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
1443 | Symbol_table::PREDEFINED, | |
1444 | this->irelative_rel_, 0, 0, | |
1445 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1446 | elfcpp::STV_HIDDEN, 0, false, true); | |
1447 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
1448 | Symbol_table::PREDEFINED, | |
1449 | this->irelative_rel_, 0, 0, | |
1450 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1451 | elfcpp::STV_HIDDEN, 0, true, true); | |
1452 | } | |
1453 | } | |
1454 | return this->irelative_rel_; | |
1455 | } | |
1456 | ||
1457 | // Return the PLT address to use for a global symbol. | |
1458 | ||
fc51264f | 1459 | template<int size> |
67181c72 | 1460 | uint64_t |
fc51264f | 1461 | Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym) |
67181c72 ILT |
1462 | { |
1463 | uint64_t offset = 0; | |
1464 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1465 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1466 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1467 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1468 | } |
1469 | ||
1470 | // Return the PLT address to use for a local symbol. These are always | |
1471 | // IRELATIVE relocs. | |
1472 | ||
fc51264f | 1473 | template<int size> |
67181c72 | 1474 | uint64_t |
19fec8c1 AM |
1475 | Output_data_plt_x86_64<size>::address_for_local(const Relobj* object, |
1476 | unsigned int r_sym) | |
67181c72 | 1477 | { |
19fec8c1 AM |
1478 | return (this->address() |
1479 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1480 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1481 | } |
1482 | ||
c2b45e22 | 1483 | // Set the final size. |
fc51264f | 1484 | template<int size> |
c2b45e22 | 1485 | void |
fc51264f | 1486 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1487 | { |
67181c72 | 1488 | unsigned int count = this->count_ + this->irelative_count_; |
c2b45e22 CC |
1489 | if (this->has_tlsdesc_entry()) |
1490 | ++count; | |
2e702c99 | 1491 | this->set_data_size((count + 1) * this->get_plt_entry_size()); |
c2b45e22 CC |
1492 | } |
1493 | ||
2e30d253 ILT |
1494 | // The first entry in the PLT for an executable. |
1495 | ||
fc51264f L |
1496 | template<int size> |
1497 | const unsigned char | |
2e702c99 | 1498 | Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] = |
2e30d253 ILT |
1499 | { |
1500 | // From AMD64 ABI Draft 0.98, page 76 | |
1501 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1502 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1503 | 0xff, 0x25, // jmp indirect |
1504 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1505 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1506 | }; | |
1507 | ||
2e702c99 RM |
1508 | template<int size> |
1509 | void | |
1510 | Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry( | |
1511 | unsigned char* pov, | |
1512 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1513 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
1514 | { | |
1515 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1516 | // We do a jmp relative to the PC at the end of this instruction. | |
1517 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1518 | (got_address + 8 | |
1519 | - (plt_address + 6))); | |
1520 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1521 | (got_address + 16 | |
1522 | - (plt_address + 12))); | |
1523 | } | |
1524 | ||
2e30d253 ILT |
1525 | // Subsequent entries in the PLT for an executable. |
1526 | ||
fc51264f L |
1527 | template<int size> |
1528 | const unsigned char | |
2e702c99 | 1529 | Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] = |
2e30d253 ILT |
1530 | { |
1531 | // From AMD64 ABI Draft 0.98, page 76 | |
1532 | 0xff, 0x25, // jmpq indirect | |
1533 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1534 | 0x68, // pushq immediate | |
1535 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1536 | 0xe9, // jmpq relative | |
1537 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1538 | }; | |
1539 | ||
2e702c99 RM |
1540 | template<int size> |
1541 | unsigned int | |
1542 | Output_data_plt_x86_64_standard<size>::do_fill_plt_entry( | |
1543 | unsigned char* pov, | |
1544 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1545 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1546 | unsigned int got_offset, | |
1547 | unsigned int plt_offset, | |
1548 | unsigned int plt_index) | |
1549 | { | |
9d585188 L |
1550 | // Check PC-relative offset overflow in PLT entry. |
1551 | uint64_t plt_got_pcrel_offset = (got_address + got_offset | |
1552 | - (plt_address + plt_offset + 6)); | |
1553 | if (Bits<32>::has_overflow(plt_got_pcrel_offset)) | |
1554 | gold_error(_("PC-relative offset overflow in PLT entry %d"), | |
1555 | plt_index + 1); | |
1556 | ||
2e702c99 RM |
1557 | memcpy(pov, plt_entry, plt_entry_size); |
1558 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
9d585188 | 1559 | plt_got_pcrel_offset); |
2e702c99 RM |
1560 | |
1561 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1562 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1563 | - (plt_offset + plt_entry_size)); | |
1564 | ||
1565 | return 6; | |
1566 | } | |
1567 | ||
c2b45e22 CC |
1568 | // The reserved TLSDESC entry in the PLT for an executable. |
1569 | ||
fc51264f L |
1570 | template<int size> |
1571 | const unsigned char | |
2e702c99 | 1572 | Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] = |
c2b45e22 CC |
1573 | { |
1574 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1575 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1576 | 0xff, 0x35, // pushq x(%rip) | |
1577 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1578 | 0xff, 0x25, // jmpq *y(%rip) | |
1579 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1580 | 0x0f, 0x1f, // nop | |
1581 | 0x40, 0 | |
1582 | }; | |
1583 | ||
2e702c99 RM |
1584 | template<int size> |
1585 | void | |
1586 | Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry( | |
1587 | unsigned char* pov, | |
1588 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1589 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1590 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
1591 | unsigned int tlsdesc_got_offset, | |
1592 | unsigned int plt_offset) | |
1593 | { | |
1594 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1595 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1596 | (got_address + 8 | |
1597 | - (plt_address + plt_offset | |
1598 | + 6))); | |
1599 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1600 | (got_base | |
1601 | + tlsdesc_got_offset | |
1602 | - (plt_address + plt_offset | |
1603 | + 12))); | |
1604 | } | |
1605 | ||
07a60597 ILT |
1606 | // The .eh_frame unwind information for the PLT. |
1607 | ||
fc51264f | 1608 | template<int size> |
2e702c99 | 1609 | const unsigned char |
fc51264f | 1610 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
1611 | { |
1612 | 1, // CIE version. | |
1613 | 'z', // Augmentation: augmentation size included. | |
1614 | 'R', // Augmentation: FDE encoding included. | |
1615 | '\0', // End of augmentation string. | |
1616 | 1, // Code alignment factor. | |
1617 | 0x78, // Data alignment factor. | |
1618 | 16, // Return address column. | |
1619 | 1, // Augmentation size. | |
1620 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1621 | | elfcpp::DW_EH_PE_sdata4), | |
1622 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
1623 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
1624 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1625 | elfcpp::DW_CFA_nop | |
1626 | }; | |
1627 | ||
fc51264f | 1628 | template<int size> |
07a60597 | 1629 | const unsigned char |
2e702c99 | 1630 | Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1631 | { |
1632 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1633 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1634 | 0, // Augmentation size. | |
1635 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
1636 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1637 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
1638 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1639 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1640 | 11, // Block length. | |
1641 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
1642 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
1643 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1644 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
1645 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1646 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
1647 | elfcpp::DW_OP_lit3, // Push 3. | |
1648 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
1649 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
1650 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
1651 | elfcpp::DW_CFA_nop, | |
1652 | elfcpp::DW_CFA_nop, | |
1653 | elfcpp::DW_CFA_nop | |
1654 | }; | |
1655 | ||
2e30d253 ILT |
1656 | // Write out the PLT. This uses the hand-coded instructions above, |
1657 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
1658 | ||
fc51264f | 1659 | template<int size> |
2e30d253 | 1660 | void |
fc51264f | 1661 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 1662 | { |
2ea97941 | 1663 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1664 | const section_size_type oview_size = |
1665 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1666 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
1667 | |
1668 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1669 | gold_assert(parameters->incremental_update() |
1670 | || (got_file_offset + this->got_plt_->data_size() | |
1671 | == this->got_irelative_->offset())); | |
fe8718a4 | 1672 | const section_size_type got_size = |
67181c72 ILT |
1673 | convert_to_section_size_type(this->got_plt_->data_size() |
1674 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
1675 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1676 | got_size); | |
1677 | ||
1678 | unsigned char* pov = oview; | |
1679 | ||
c2b45e22 | 1680 | // The base address of the .plt section. |
fc51264f | 1681 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 1682 | // The base address of the .got section. |
fc51264f | 1683 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
1684 | // The base address of the PLT portion of the .got section, |
1685 | // which is where the GOT pointer will point, and where the | |
1686 | // three reserved GOT entries are located. | |
fc51264f L |
1687 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
1688 | = this->got_plt_->address(); | |
2e30d253 | 1689 | |
2e702c99 RM |
1690 | this->fill_first_plt_entry(pov, got_address, plt_address); |
1691 | pov += this->get_plt_entry_size(); | |
2e30d253 | 1692 | |
57b2284c CC |
1693 | // The first three entries in the GOT are reserved, and are written |
1694 | // by Output_data_got_plt_x86_64::do_write. | |
1695 | unsigned char* got_pov = got_view + 24; | |
2e30d253 | 1696 | |
2e702c99 | 1697 | unsigned int plt_offset = this->get_plt_entry_size(); |
2e30d253 | 1698 | unsigned int got_offset = 24; |
67181c72 | 1699 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
1700 | for (unsigned int plt_index = 0; |
1701 | plt_index < count; | |
1702 | ++plt_index, | |
2e702c99 | 1703 | pov += this->get_plt_entry_size(), |
2e30d253 | 1704 | got_pov += 8, |
2e702c99 | 1705 | plt_offset += this->get_plt_entry_size(), |
2e30d253 ILT |
1706 | got_offset += 8) |
1707 | { | |
1708 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1709 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1710 | got_address, plt_address, | |
1711 | got_offset, plt_offset, | |
1712 | plt_index); | |
2e30d253 ILT |
1713 | |
1714 | // Set the entry in the GOT. | |
2e702c99 RM |
1715 | elfcpp::Swap<64, false>::writeval(got_pov, |
1716 | plt_address + plt_offset + lazy_offset); | |
2e30d253 ILT |
1717 | } |
1718 | ||
c2b45e22 CC |
1719 | if (this->has_tlsdesc_entry()) |
1720 | { | |
1721 | // Set and adjust the reserved TLSDESC PLT entry. | |
1722 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2e702c99 RM |
1723 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, |
1724 | tlsdesc_got_offset, plt_offset); | |
1725 | pov += this->get_plt_entry_size(); | |
c2b45e22 CC |
1726 | } |
1727 | ||
fe8718a4 ILT |
1728 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1729 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1730 | |
2ea97941 | 1731 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1732 | of->write_output_view(got_file_offset, got_size, got_view); |
1733 | } | |
1734 | ||
c2b45e22 | 1735 | // Create the PLT section. |
2e30d253 | 1736 | |
fc51264f | 1737 | template<int size> |
2e30d253 | 1738 | void |
fc51264f | 1739 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1740 | { |
2e30d253 ILT |
1741 | if (this->plt_ == NULL) |
1742 | { | |
1743 | // Create the GOT sections first. | |
1744 | this->got_section(symtab, layout); | |
1745 | ||
2e702c99 RM |
1746 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
1747 | this->got_irelative_); | |
1748 | ||
1749 | // Add unwind information if requested. | |
1750 | if (parameters->options().ld_generated_unwind_info()) | |
1751 | this->plt_->add_eh_frame(layout); | |
1752 | ||
2e30d253 ILT |
1753 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1754 | (elfcpp::SHF_ALLOC | |
1755 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1756 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1757 | |
1758 | // Make the sh_info field of .rela.plt point to .plt. | |
1759 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1760 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1761 | } |
c2b45e22 CC |
1762 | } |
1763 | ||
e291e7b9 ILT |
1764 | // Return the section for TLSDESC relocations. |
1765 | ||
fc51264f L |
1766 | template<int size> |
1767 | typename Target_x86_64<size>::Reloc_section* | |
1768 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
1769 | { |
1770 | return this->plt_section()->rela_tlsdesc(layout); | |
1771 | } | |
1772 | ||
c2b45e22 CC |
1773 | // Create a PLT entry for a global symbol. |
1774 | ||
fc51264f | 1775 | template<int size> |
c2b45e22 | 1776 | void |
fc51264f L |
1777 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
1778 | Symbol* gsym) | |
c2b45e22 CC |
1779 | { |
1780 | if (gsym->has_plt_offset()) | |
1781 | return; | |
1782 | ||
1783 | if (this->plt_ == NULL) | |
1784 | this->make_plt_section(symtab, layout); | |
2e30d253 | 1785 | |
67181c72 | 1786 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
1787 | } |
1788 | ||
7223e9ca ILT |
1789 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1790 | ||
fc51264f | 1791 | template<int size> |
7223e9ca | 1792 | void |
fc51264f L |
1793 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
1794 | Symbol_table* symtab, Layout* layout, | |
1795 | Sized_relobj_file<size, false>* relobj, | |
1796 | unsigned int local_sym_index) | |
7223e9ca ILT |
1797 | { |
1798 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1799 | return; | |
1800 | if (this->plt_ == NULL) | |
1801 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1802 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1803 | relobj, | |
7223e9ca ILT |
1804 | local_sym_index); |
1805 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1806 | } | |
1807 | ||
0e70b911 CC |
1808 | // Return the number of entries in the PLT. |
1809 | ||
fc51264f | 1810 | template<int size> |
0e70b911 | 1811 | unsigned int |
fc51264f | 1812 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
1813 | { |
1814 | if (this->plt_ == NULL) | |
1815 | return 0; | |
1816 | return this->plt_->entry_count(); | |
1817 | } | |
1818 | ||
1819 | // Return the offset of the first non-reserved PLT entry. | |
1820 | ||
fc51264f | 1821 | template<int size> |
0e70b911 | 1822 | unsigned int |
fc51264f | 1823 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 1824 | { |
2e702c99 | 1825 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1826 | } |
1827 | ||
1828 | // Return the size of each PLT entry. | |
1829 | ||
fc51264f | 1830 | template<int size> |
0e70b911 | 1831 | unsigned int |
fc51264f | 1832 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 1833 | { |
2e702c99 | 1834 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1835 | } |
1836 | ||
4829d394 CC |
1837 | // Create the GOT and PLT sections for an incremental update. |
1838 | ||
fc51264f | 1839 | template<int size> |
dd74ae06 | 1840 | Output_data_got_base* |
fc51264f | 1841 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
1842 | Layout* layout, |
1843 | unsigned int got_count, | |
1844 | unsigned int plt_count) | |
1845 | { | |
1846 | gold_assert(this->got_ == NULL); | |
1847 | ||
1848 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
1849 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1850 | (elfcpp::SHF_ALLOC | |
1851 | | elfcpp::SHF_WRITE), | |
1852 | this->got_, ORDER_RELRO_LAST, | |
1853 | true); | |
1854 | ||
1855 | // Add the three reserved entries. | |
57b2284c | 1856 | this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8); |
4829d394 CC |
1857 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1858 | (elfcpp::SHF_ALLOC | |
1859 | | elfcpp::SHF_WRITE), | |
1860 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
1861 | false); | |
1862 | ||
1863 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1864 | this->global_offset_table_ = | |
1865 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1866 | Symbol_table::PREDEFINED, | |
1867 | this->got_plt_, | |
1868 | 0, 0, elfcpp::STT_OBJECT, | |
1869 | elfcpp::STB_LOCAL, | |
1870 | elfcpp::STV_HIDDEN, 0, | |
1871 | false, false); | |
1872 | ||
1873 | // If there are any TLSDESC relocations, they get GOT entries in | |
1874 | // .got.plt after the jump slot entries. | |
1875 | // FIXME: Get the count for TLSDESC entries. | |
1876 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
1877 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1878 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1879 | this->got_tlsdesc_, | |
1880 | ORDER_NON_RELRO_FIRST, false); | |
1881 | ||
67181c72 ILT |
1882 | // If there are any IRELATIVE relocations, they get GOT entries in |
1883 | // .got.plt after the jump slot and TLSDESC entries. | |
1884 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
1885 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1886 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1887 | this->got_irelative_, | |
1888 | ORDER_NON_RELRO_FIRST, false); | |
1889 | ||
4829d394 | 1890 | // Create the PLT section. |
2e702c99 RM |
1891 | this->plt_ = this->make_data_plt(layout, this->got_, |
1892 | this->got_plt_, | |
1893 | this->got_irelative_, | |
1894 | plt_count); | |
1895 | ||
1896 | // Add unwind information if requested. | |
1897 | if (parameters->options().ld_generated_unwind_info()) | |
1898 | this->plt_->add_eh_frame(layout); | |
1899 | ||
4829d394 CC |
1900 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1901 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
1902 | this->plt_, ORDER_PLT, false); | |
1903 | ||
1904 | // Make the sh_info field of .rela.plt point to .plt. | |
1905 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1906 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
1907 | ||
6fa2a40b CC |
1908 | // Create the rela_dyn section. |
1909 | this->rela_dyn_section(layout); | |
1910 | ||
4829d394 CC |
1911 | return this->got_; |
1912 | } | |
1913 | ||
6fa2a40b CC |
1914 | // Reserve a GOT entry for a local symbol, and regenerate any |
1915 | // necessary dynamic relocations. | |
1916 | ||
fc51264f | 1917 | template<int size> |
6fa2a40b | 1918 | void |
fc51264f | 1919 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 1920 | unsigned int got_index, |
fc51264f | 1921 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
1922 | unsigned int r_sym, |
1923 | unsigned int got_type) | |
1924 | { | |
1925 | unsigned int got_offset = got_index * 8; | |
1926 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1927 | ||
1928 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
1929 | switch (got_type) | |
1930 | { | |
1931 | case GOT_TYPE_STANDARD: | |
1932 | if (parameters->options().output_is_position_independent()) | |
1933 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 1934 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1935 | break; |
1936 | case GOT_TYPE_TLS_OFFSET: | |
1937 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
1938 | this->got_, got_offset, 0); | |
1939 | break; | |
1940 | case GOT_TYPE_TLS_PAIR: | |
1941 | this->got_->reserve_slot(got_index + 1); | |
1942 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
1943 | this->got_, got_offset, 0); | |
1944 | break; | |
1945 | case GOT_TYPE_TLS_DESC: | |
1946 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
1947 | // this->got_->reserve_slot(got_index + 1); | |
1948 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1949 | // this->got_, got_offset, 0); | |
1950 | break; | |
1951 | default: | |
1952 | gold_unreachable(); | |
1953 | } | |
1954 | } | |
1955 | ||
1956 | // Reserve a GOT entry for a global symbol, and regenerate any | |
1957 | // necessary dynamic relocations. | |
1958 | ||
fc51264f | 1959 | template<int size> |
6fa2a40b | 1960 | void |
fc51264f L |
1961 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
1962 | Symbol* gsym, | |
1963 | unsigned int got_type) | |
6fa2a40b CC |
1964 | { |
1965 | unsigned int got_offset = got_index * 8; | |
1966 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1967 | ||
1968 | this->got_->reserve_global(got_index, gsym, got_type); | |
1969 | switch (got_type) | |
1970 | { | |
1971 | case GOT_TYPE_STANDARD: | |
1972 | if (!gsym->final_value_is_known()) | |
1973 | { | |
1974 | if (gsym->is_from_dynobj() | |
1975 | || gsym->is_undefined() | |
1976 | || gsym->is_preemptible() | |
1977 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1978 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
1979 | this->got_, got_offset, 0); | |
1980 | else | |
1981 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 1982 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1983 | } |
1984 | break; | |
1985 | case GOT_TYPE_TLS_OFFSET: | |
1986 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
13cf9988 | 1987 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1988 | break; |
1989 | case GOT_TYPE_TLS_PAIR: | |
1990 | this->got_->reserve_slot(got_index + 1); | |
1991 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
13cf9988 | 1992 | this->got_, got_offset, 0, false); |
6fa2a40b | 1993 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, |
13cf9988 | 1994 | this->got_, got_offset + 8, 0, false); |
6fa2a40b CC |
1995 | break; |
1996 | case GOT_TYPE_TLS_DESC: | |
1997 | this->got_->reserve_slot(got_index + 1); | |
1998 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
13cf9988 | 1999 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
2000 | break; |
2001 | default: | |
2002 | gold_unreachable(); | |
2003 | } | |
2004 | } | |
2005 | ||
4829d394 CC |
2006 | // Register an existing PLT entry for a global symbol. |
2007 | ||
fc51264f | 2008 | template<int size> |
4829d394 | 2009 | void |
fc51264f L |
2010 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
2011 | Layout* layout, | |
2012 | unsigned int plt_index, | |
2013 | Symbol* gsym) | |
4829d394 CC |
2014 | { |
2015 | gold_assert(this->plt_ != NULL); | |
2016 | gold_assert(!gsym->has_plt_offset()); | |
2017 | ||
2018 | this->plt_->reserve_slot(plt_index); | |
2019 | ||
2020 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
2021 | ||
2022 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 2023 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
2024 | } |
2025 | ||
26d3c67d CC |
2026 | // Force a COPY relocation for a given symbol. |
2027 | ||
fc51264f | 2028 | template<int size> |
26d3c67d | 2029 | void |
fc51264f | 2030 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
2031 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
2032 | { | |
2033 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 2034 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
2035 | os, |
2036 | offset, | |
2037 | this->rela_dyn_section(NULL)); | |
2038 | } | |
2039 | ||
9fa33bee | 2040 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 2041 | |
fc51264f | 2042 | template<int size> |
edfbb029 | 2043 | void |
fc51264f L |
2044 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
2045 | Layout* layout) | |
edfbb029 CC |
2046 | { |
2047 | if (this->tls_base_symbol_defined_) | |
2048 | return; | |
2049 | ||
2050 | Output_segment* tls_segment = layout->tls_segment(); | |
2051 | if (tls_segment != NULL) | |
2052 | { | |
183fd0e3 | 2053 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 2054 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 2055 | Symbol_table::PREDEFINED, |
edfbb029 CC |
2056 | tls_segment, 0, 0, |
2057 | elfcpp::STT_TLS, | |
2058 | elfcpp::STB_LOCAL, | |
2059 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
2060 | (is_exec |
2061 | ? Symbol::SEGMENT_END | |
2062 | : Symbol::SEGMENT_START), | |
2063 | true); | |
edfbb029 CC |
2064 | } |
2065 | this->tls_base_symbol_defined_ = true; | |
2066 | } | |
2067 | ||
c2b45e22 CC |
2068 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
2069 | ||
fc51264f | 2070 | template<int size> |
c2b45e22 | 2071 | void |
fc51264f | 2072 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
2e702c99 | 2073 | Layout* layout) |
c2b45e22 CC |
2074 | { |
2075 | if (this->plt_ == NULL) | |
2076 | this->make_plt_section(symtab, layout); | |
2077 | ||
2078 | if (!this->plt_->has_tlsdesc_entry()) | |
2079 | { | |
2080 | // Allocate the TLSDESC_GOT entry. | |
2081 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2082 | unsigned int got_offset = got->add_constant(0); | |
2083 | ||
2084 | // Allocate the TLSDESC_PLT entry. | |
2085 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
2086 | } | |
2087 | } | |
2088 | ||
31d60480 ILT |
2089 | // Create a GOT entry for the TLS module index. |
2090 | ||
fc51264f | 2091 | template<int size> |
31d60480 | 2092 | unsigned int |
fc51264f L |
2093 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
2094 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
2095 | { |
2096 | if (this->got_mod_index_offset_ == -1U) | |
2097 | { | |
2098 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
2099 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
2100 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2101 | unsigned int got_offset = got->add_constant(0); | |
2102 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
2e702c99 | 2103 | got_offset, 0); |
009a67a2 | 2104 | got->add_constant(0); |
31d60480 ILT |
2105 | this->got_mod_index_offset_ = got_offset; |
2106 | } | |
2107 | return this->got_mod_index_offset_; | |
2108 | } | |
2109 | ||
2e30d253 ILT |
2110 | // Optimize the TLS relocation type based on what we know about the |
2111 | // symbol. IS_FINAL is true if the final address of this symbol is | |
2112 | // known at link time. | |
2113 | ||
fc51264f | 2114 | template<int size> |
e041f13d | 2115 | tls::Tls_optimization |
fc51264f | 2116 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 2117 | { |
2e30d253 ILT |
2118 | // If we are generating a shared library, then we can't do anything |
2119 | // in the linker. | |
8851ecca | 2120 | if (parameters->options().shared()) |
e041f13d | 2121 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2122 | |
2123 | switch (r_type) | |
2124 | { | |
2125 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
2126 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2127 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2128 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
2129 | // access. Since we know that we are generating an executable, |
2130 | // we can convert this to Initial-Exec. If we also know that | |
2131 | // this is a local symbol, we can further switch to Local-Exec. | |
2132 | if (is_final) | |
e041f13d ILT |
2133 | return tls::TLSOPT_TO_LE; |
2134 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 2135 | |
d61c17ea | 2136 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
2137 | // This is Local-Dynamic, which refers to a local symbol in the |
2138 | // dynamic TLS block. Since we know that we generating an | |
2139 | // executable, we can switch to Local-Exec. | |
e041f13d | 2140 | return tls::TLSOPT_TO_LE; |
2e30d253 | 2141 | |
0ffd9845 | 2142 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
2143 | case elfcpp::R_X86_64_DTPOFF64: |
2144 | // Another Local-Dynamic reloc. | |
e041f13d | 2145 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 2146 | |
d61c17ea | 2147 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
2148 | // These are Initial-Exec relocs which get the thread offset |
2149 | // from the GOT. If we know that we are linking against the | |
2150 | // local symbol, we can switch to Local-Exec, which links the | |
2151 | // thread offset into the instruction. | |
2152 | if (is_final) | |
e041f13d ILT |
2153 | return tls::TLSOPT_TO_LE; |
2154 | return tls::TLSOPT_NONE; | |
2e30d253 | 2155 | |
d61c17ea | 2156 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
2157 | // When we already have Local-Exec, there is nothing further we |
2158 | // can do. | |
e041f13d | 2159 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2160 | |
2161 | default: | |
2162 | gold_unreachable(); | |
2163 | } | |
2e30d253 ILT |
2164 | } |
2165 | ||
95a2c8d6 RS |
2166 | // Get the Reference_flags for a particular relocation. |
2167 | ||
fc51264f | 2168 | template<int size> |
95a2c8d6 | 2169 | int |
fc51264f | 2170 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
2171 | { |
2172 | switch (r_type) | |
2173 | { | |
2174 | case elfcpp::R_X86_64_NONE: | |
2175 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
2176 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2177 | case elfcpp::R_X86_64_GOTPC32: | |
2178 | case elfcpp::R_X86_64_GOTPC64: | |
2179 | // No symbol reference. | |
2180 | return 0; | |
2181 | ||
2182 | case elfcpp::R_X86_64_64: | |
2183 | case elfcpp::R_X86_64_32: | |
2184 | case elfcpp::R_X86_64_32S: | |
2185 | case elfcpp::R_X86_64_16: | |
2186 | case elfcpp::R_X86_64_8: | |
2187 | return Symbol::ABSOLUTE_REF; | |
2188 | ||
2189 | case elfcpp::R_X86_64_PC64: | |
2190 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2191 | case elfcpp::R_X86_64_PC32_BND: |
95a2c8d6 RS |
2192 | case elfcpp::R_X86_64_PC16: |
2193 | case elfcpp::R_X86_64_PC8: | |
2194 | case elfcpp::R_X86_64_GOTOFF64: | |
2195 | return Symbol::RELATIVE_REF; | |
2196 | ||
2197 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 2198 | case elfcpp::R_X86_64_PLT32_BND: |
95a2c8d6 RS |
2199 | case elfcpp::R_X86_64_PLTOFF64: |
2200 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
2201 | ||
2202 | case elfcpp::R_X86_64_GOT64: | |
2203 | case elfcpp::R_X86_64_GOT32: | |
2204 | case elfcpp::R_X86_64_GOTPCREL64: | |
2205 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
2206 | case elfcpp::R_X86_64_GOTPCRELX: |
2207 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
95a2c8d6 RS |
2208 | case elfcpp::R_X86_64_GOTPLT64: |
2209 | // Absolute in GOT. | |
2210 | return Symbol::ABSOLUTE_REF; | |
2211 | ||
2212 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2213 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2214 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2215 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2216 | case elfcpp::R_X86_64_DTPOFF32: | |
2217 | case elfcpp::R_X86_64_DTPOFF64: | |
2218 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2219 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2220 | return Symbol::TLS_REF; | |
2221 | ||
2222 | case elfcpp::R_X86_64_COPY: | |
2223 | case elfcpp::R_X86_64_GLOB_DAT: | |
2224 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2225 | case elfcpp::R_X86_64_RELATIVE: | |
2226 | case elfcpp::R_X86_64_IRELATIVE: | |
2227 | case elfcpp::R_X86_64_TPOFF64: | |
2228 | case elfcpp::R_X86_64_DTPMOD64: | |
2229 | case elfcpp::R_X86_64_TLSDESC: | |
2230 | case elfcpp::R_X86_64_SIZE32: | |
2231 | case elfcpp::R_X86_64_SIZE64: | |
2232 | default: | |
2233 | // Not expected. We will give an error later. | |
2234 | return 0; | |
2235 | } | |
2236 | } | |
2237 | ||
e041f13d ILT |
2238 | // Report an unsupported relocation against a local symbol. |
2239 | ||
fc51264f | 2240 | template<int size> |
e041f13d | 2241 | void |
fc51264f L |
2242 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
2243 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2244 | unsigned int r_type) |
e041f13d | 2245 | { |
75f2446e ILT |
2246 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2247 | object->name().c_str(), r_type); | |
e041f13d ILT |
2248 | } |
2249 | ||
a036edd8 ILT |
2250 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
2251 | // dynamic linker does not support it, issue an error. The GNU linker | |
2252 | // only issues a non-PIC error for an allocated read-only section. | |
2253 | // Here we know the section is allocated, but we don't know that it is | |
2254 | // read-only. But we check for all the relocation types which the | |
2255 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
2256 | // error even if the section is not read-only. If GSYM is not NULL, |
2257 | // it is the symbol the relocation is against; if it is NULL, the | |
2258 | // relocation is against a local symbol. | |
a036edd8 | 2259 | |
fc51264f | 2260 | template<int size> |
a036edd8 | 2261 | void |
fc51264f L |
2262 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
2263 | Symbol* gsym) | |
a036edd8 ILT |
2264 | { |
2265 | switch (r_type) | |
2266 | { | |
2fbb4320 ILT |
2267 | // These are the relocation types supported by glibc for x86_64 |
2268 | // which should always work. | |
a036edd8 | 2269 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 2270 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
2271 | case elfcpp::R_X86_64_GLOB_DAT: |
2272 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2273 | case elfcpp::R_X86_64_DTPMOD64: | |
2274 | case elfcpp::R_X86_64_DTPOFF64: | |
2275 | case elfcpp::R_X86_64_TPOFF64: | |
2276 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
2277 | case elfcpp::R_X86_64_COPY: |
2278 | return; | |
2279 | ||
2280 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 2281 | case elfcpp::R_X86_64_PC32: |
f49fe902 | 2282 | case elfcpp::R_X86_64_PC32_BND: |
a29b0dad ILT |
2283 | // A PC relative reference is OK against a local symbol or if |
2284 | // the symbol is defined locally. | |
2285 | if (gsym == NULL | |
2286 | || (!gsym->is_from_dynobj() | |
2287 | && !gsym->is_undefined() | |
2288 | && !gsym->is_preemptible())) | |
2289 | return; | |
2290 | /* Fall through. */ | |
2291 | case elfcpp::R_X86_64_32: | |
3660ff06 L |
2292 | // R_X86_64_32 is OK for x32. |
2293 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2294 | return; | |
2fbb4320 ILT |
2295 | if (this->issued_non_pic_error_) |
2296 | return; | |
2297 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
2298 | if (gsym == NULL) |
2299 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
2300 | "overflow at runtime; recompile with -fPIC")); | |
2301 | else | |
f49fe902 L |
2302 | { |
2303 | const char *r_name; | |
2304 | switch (r_type) | |
2305 | { | |
2306 | case elfcpp::R_X86_64_32: | |
2307 | r_name = "R_X86_64_32"; | |
2308 | break; | |
2309 | case elfcpp::R_X86_64_PC32: | |
2310 | r_name = "R_X86_64_PC32"; | |
2311 | break; | |
2312 | case elfcpp::R_X86_64_PC32_BND: | |
2313 | r_name = "R_X86_64_PC32_BND"; | |
2314 | break; | |
2315 | default: | |
2316 | gold_unreachable(); | |
2317 | break; | |
2318 | } | |
2319 | object->error(_("requires dynamic %s reloc against '%s' " | |
2320 | "which may overflow at runtime; recompile " | |
2321 | "with -fPIC"), | |
2322 | r_name, gsym->name()); | |
2323 | } | |
2fbb4320 | 2324 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
2325 | return; |
2326 | ||
2327 | default: | |
2328 | // This prevents us from issuing more than one error per reloc | |
2329 | // section. But we can still wind up issuing more than one | |
2330 | // error per object file. | |
2331 | if (this->issued_non_pic_error_) | |
2e702c99 | 2332 | return; |
33aea2fd | 2333 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad | 2334 | object->error(_("requires unsupported dynamic reloc %u; " |
2e702c99 | 2335 | "recompile with -fPIC"), |
a29b0dad | 2336 | r_type); |
a036edd8 ILT |
2337 | this->issued_non_pic_error_ = true; |
2338 | return; | |
2339 | ||
2340 | case elfcpp::R_X86_64_NONE: | |
2341 | gold_unreachable(); | |
2342 | } | |
2343 | } | |
2344 | ||
7223e9ca ILT |
2345 | // Return whether we need to make a PLT entry for a relocation of the |
2346 | // given type against a STT_GNU_IFUNC symbol. | |
2347 | ||
fc51264f | 2348 | template<int size> |
7223e9ca | 2349 | bool |
fc51264f L |
2350 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
2351 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2352 | unsigned int r_type) |
7223e9ca | 2353 | { |
95a2c8d6 RS |
2354 | int flags = Scan::get_reference_flags(r_type); |
2355 | if (flags & Symbol::TLS_REF) | |
2356 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 2357 | object->name().c_str(), r_type); |
95a2c8d6 | 2358 | return flags != 0; |
7223e9ca ILT |
2359 | } |
2360 | ||
2e30d253 ILT |
2361 | // Scan a relocation for a local symbol. |
2362 | ||
fc51264f | 2363 | template<int size> |
2e30d253 | 2364 | inline void |
fc51264f L |
2365 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
2366 | Layout* layout, | |
2367 | Target_x86_64<size>* target, | |
2368 | Sized_relobj_file<size, false>* object, | |
2369 | unsigned int data_shndx, | |
2370 | Output_section* output_section, | |
2371 | const elfcpp::Rela<size, false>& reloc, | |
2372 | unsigned int r_type, | |
bfdfa4cd AM |
2373 | const elfcpp::Sym<size, false>& lsym, |
2374 | bool is_discarded) | |
2e30d253 | 2375 | { |
bfdfa4cd AM |
2376 | if (is_discarded) |
2377 | return; | |
2378 | ||
7223e9ca | 2379 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
2380 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
2381 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 2382 | { |
fc51264f | 2383 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2384 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
2385 | } | |
2386 | ||
2e30d253 ILT |
2387 | switch (r_type) |
2388 | { | |
2389 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2390 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2391 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2392 | break; |
2393 | ||
2394 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 2395 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2396 | // executable), we need to create a dynamic relocation for this |
2397 | // location. The relocation applied at link time will apply the | |
2398 | // link-time value, so we flag the location with an | |
2399 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 2400 | // relocate it easily. |
8851ecca | 2401 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
2402 | { |
2403 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2404 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca | 2405 | rela_dyn->add_local_relative(object, r_sym, |
62fe925a | 2406 | (size == 32 |
fd885f3a L |
2407 | ? elfcpp::R_X86_64_RELATIVE64 |
2408 | : elfcpp::R_X86_64_RELATIVE), | |
7223e9ca ILT |
2409 | output_section, data_shndx, |
2410 | reloc.get_r_offset(), | |
397b129b | 2411 | reloc.get_r_addend(), is_ifunc); |
2e702c99 | 2412 | } |
d61c6bd4 ILT |
2413 | break; |
2414 | ||
2e30d253 ILT |
2415 | case elfcpp::R_X86_64_32: |
2416 | case elfcpp::R_X86_64_32S: | |
2417 | case elfcpp::R_X86_64_16: | |
2418 | case elfcpp::R_X86_64_8: | |
96f2030e | 2419 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2420 | // executable), we need to create a dynamic relocation for this |
2421 | // location. We can't use an R_X86_64_RELATIVE relocation | |
2422 | // because that is always a 64-bit relocation. | |
8851ecca | 2423 | if (parameters->options().output_is_position_independent()) |
2e702c99 | 2424 | { |
3660ff06 L |
2425 | // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32. |
2426 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2427 | { | |
2428 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2429 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2430 | rela_dyn->add_local_relative(object, r_sym, | |
2431 | elfcpp::R_X86_64_RELATIVE, | |
2432 | output_section, data_shndx, | |
2433 | reloc.get_r_offset(), | |
2434 | reloc.get_r_addend(), is_ifunc); | |
2435 | break; | |
2436 | } | |
2437 | ||
2e702c99 | 2438 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 2439 | |
2e702c99 | 2440 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 2441 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
2e702c99 | 2442 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
2443 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
2444 | data_shndx, reloc.get_r_offset(), | |
2445 | reloc.get_r_addend()); | |
2e702c99 RM |
2446 | else |
2447 | { | |
2448 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
2449 | unsigned int shndx = lsym.get_st_shndx(); |
2450 | bool is_ordinary; | |
2451 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
2452 | &is_ordinary); | |
2453 | if (!is_ordinary) | |
2454 | object->error(_("section symbol %u has bad shndx %u"), | |
2455 | r_sym, shndx); | |
2456 | else | |
2457 | rela_dyn->add_local_section(object, shndx, | |
2458 | r_type, output_section, | |
2459 | data_shndx, reloc.get_r_offset(), | |
2460 | reloc.get_r_addend()); | |
2e702c99 RM |
2461 | } |
2462 | } | |
2e30d253 ILT |
2463 | break; |
2464 | ||
2465 | case elfcpp::R_X86_64_PC64: | |
2466 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2467 | case elfcpp::R_X86_64_PC32_BND: |
2e30d253 ILT |
2468 | case elfcpp::R_X86_64_PC16: |
2469 | case elfcpp::R_X86_64_PC8: | |
2470 | break; | |
2471 | ||
f389a824 | 2472 | case elfcpp::R_X86_64_PLT32: |
f49fe902 | 2473 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 ILT |
2474 | // Since we know this is a local symbol, we can handle this as a |
2475 | // PC32 reloc. | |
2476 | break; | |
2477 | ||
fdc2f80f | 2478 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2479 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2480 | case elfcpp::R_X86_64_GOTPC64: |
2481 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2482 | // We need a GOT section. |
2483 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2484 | // For PLTOFF64, we'd normally want a PLT section, but since we |
2485 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
2486 | break; |
2487 | ||
0ffd9845 ILT |
2488 | case elfcpp::R_X86_64_GOT64: |
2489 | case elfcpp::R_X86_64_GOT32: | |
2490 | case elfcpp::R_X86_64_GOTPCREL64: | |
2491 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
2492 | case elfcpp::R_X86_64_GOTPCRELX: |
2493 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ee9e9e86 | 2494 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 2495 | { |
1fa29f10 | 2496 | // The symbol requires a GOT section. |
2e702c99 | 2497 | Output_data_got<64, false>* got = target->got_section(symtab, layout); |
1fa29f10 IT |
2498 | |
2499 | // If the relocation symbol isn't IFUNC, | |
2500 | // and is local, then we will convert | |
2501 | // mov foo@GOTPCREL(%rip), %reg | |
2502 | // to lea foo(%rip), %reg. | |
2503 | // in Relocate::relocate. | |
2891b491 L |
2504 | if ((r_type == elfcpp::R_X86_64_GOTPCREL |
2505 | || r_type == elfcpp::R_X86_64_GOTPCRELX | |
2506 | || r_type == elfcpp::R_X86_64_REX_GOTPCRELX) | |
1fa29f10 IT |
2507 | && reloc.get_r_offset() >= 2 |
2508 | && !is_ifunc) | |
2509 | { | |
2510 | section_size_type stype; | |
2511 | const unsigned char* view = object->section_contents(data_shndx, | |
2512 | &stype, true); | |
2513 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
2514 | break; | |
2515 | } | |
2516 | ||
2517 | ||
2518 | // The symbol requires a GOT entry. | |
2e702c99 | 2519 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2520 | |
2521 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
2522 | // lets function pointers compare correctly with shared | |
2523 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
2524 | bool is_new; | |
397b129b | 2525 | if (is_ifunc) |
7223e9ca ILT |
2526 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
2527 | else | |
2528 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
2529 | if (is_new) |
2530 | { | |
2531 | // If we are generating a shared object, we need to add a | |
2532 | // dynamic relocation for this symbol's GOT entry. | |
2533 | if (parameters->options().output_is_position_independent()) | |
2534 | { | |
2535 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
2536 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
2537 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
2538 | { |
2539 | unsigned int got_offset = | |
2540 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
2541 | rela_dyn->add_local_relative(object, r_sym, | |
2542 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2543 | got, got_offset, 0, is_ifunc); |
7223e9ca | 2544 | } |
2e702c99 RM |
2545 | else |
2546 | { | |
2547 | this->check_non_pic(object, r_type, NULL); | |
2548 | ||
2549 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2550 | rela_dyn->add_local( | |
2551 | object, r_sym, r_type, got, | |
2552 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
2553 | } | |
2554 | } | |
2555 | } | |
2556 | // For GOTPLT64, we'd normally want a PLT section, but since | |
2557 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
2558 | } |
2559 | break; | |
2560 | ||
2e30d253 ILT |
2561 | case elfcpp::R_X86_64_COPY: |
2562 | case elfcpp::R_X86_64_GLOB_DAT: | |
2563 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2564 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2565 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2566 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2567 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2568 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2569 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2570 | gold_error(_("%s: unexpected reloc %u in object file"), |
2571 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2572 | break; |
2573 | ||
d61c17ea | 2574 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2575 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2576 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2577 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2578 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2579 | case elfcpp::R_X86_64_DTPOFF32: |
2580 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2581 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2582 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 2583 | { |
8851ecca | 2584 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 2585 | const tls::Tls_optimization optimized_type |
2e702c99 | 2586 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
fc51264f | 2587 | r_type); |
2e30d253 ILT |
2588 | switch (r_type) |
2589 | { | |
2e702c99 RM |
2590 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
2591 | if (optimized_type == tls::TLSOPT_NONE) | |
2592 | { | |
2593 | // Create a pair of GOT entries for the module index and | |
2594 | // dtv-relative offset. | |
2595 | Output_data_got<64, false>* got | |
2596 | = target->got_section(symtab, layout); | |
2597 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
d491d34e ILT |
2598 | unsigned int shndx = lsym.get_st_shndx(); |
2599 | bool is_ordinary; | |
2600 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
2601 | if (!is_ordinary) | |
2602 | object->error(_("local symbol %u has bad shndx %u"), | |
2603 | r_sym, shndx); | |
2e702c99 | 2604 | else |
83896202 ILT |
2605 | got->add_local_pair_with_rel(object, r_sym, |
2606 | shndx, | |
2607 | GOT_TYPE_TLS_PAIR, | |
2608 | target->rela_dyn_section(layout), | |
bd73a62d | 2609 | elfcpp::R_X86_64_DTPMOD64); |
2e702c99 RM |
2610 | } |
2611 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2612 | unsupported_reloc_local(object, r_type); |
2e702c99 | 2613 | break; |
7bf1f802 | 2614 | |
2e702c99 RM |
2615 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2616 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
2617 | if (optimized_type == tls::TLSOPT_NONE) |
2618 | { | |
2e702c99 RM |
2619 | // Create reserved PLT and GOT entries for the resolver. |
2620 | target->reserve_tlsdesc_entries(symtab, layout); | |
2621 | ||
2622 | // Generate a double GOT entry with an | |
2623 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
2624 | // is resolved lazily, so the GOT entry needs to be in | |
2625 | // an area in .got.plt, not .got. Call got_section to | |
2626 | // make sure the section has been created. | |
a8df5856 | 2627 | target->got_section(symtab, layout); |
2e702c99 RM |
2628 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
2629 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
e291e7b9 ILT |
2630 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
2631 | { | |
2632 | unsigned int got_offset = got->add_constant(0); | |
2633 | got->add_constant(0); | |
2634 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
2635 | got_offset); | |
2636 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
2637 | // We store the arguments we need in a vector, and | |
2638 | // use the index into the vector as the parameter | |
2639 | // to pass to the target specific routines. | |
2640 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
2641 | void* arg = reinterpret_cast<void*>(intarg); | |
2642 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2643 | got, got_offset, 0); | |
2644 | } | |
c2b45e22 CC |
2645 | } |
2646 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2647 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
2648 | break; |
2649 | ||
2e702c99 | 2650 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
2651 | break; |
2652 | ||
2e702c99 | 2653 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2654 | if (optimized_type == tls::TLSOPT_NONE) |
2655 | { | |
2e702c99 RM |
2656 | // Create a GOT entry for the module index. |
2657 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
2658 | } |
2659 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2660 | unsupported_reloc_local(object, r_type); | |
2661 | break; | |
2662 | ||
2e702c99 RM |
2663 | case elfcpp::R_X86_64_DTPOFF32: |
2664 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2665 | break; |
2666 | ||
2e702c99 | 2667 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2668 | layout->set_has_static_tls(); |
2e702c99 RM |
2669 | if (optimized_type == tls::TLSOPT_NONE) |
2670 | { | |
2671 | // Create a GOT entry for the tp-relative offset. | |
2672 | Output_data_got<64, false>* got | |
2673 | = target->got_section(symtab, layout); | |
2674 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2675 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2676 | target->rela_dyn_section(layout), |
2677 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
2678 | } |
2679 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2680 | unsupported_reloc_local(object, r_type); | |
2681 | break; | |
0ffd9845 | 2682 | |
2e702c99 | 2683 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2684 | layout->set_has_static_tls(); |
2e702c99 RM |
2685 | if (output_is_shared) |
2686 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 2687 | break; |
e041f13d | 2688 | |
2e702c99 RM |
2689 | default: |
2690 | gold_unreachable(); | |
2e30d253 ILT |
2691 | } |
2692 | } | |
2693 | break; | |
2e30d253 | 2694 | |
fdc2f80f ILT |
2695 | case elfcpp::R_X86_64_SIZE32: |
2696 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2697 | default: |
75f2446e ILT |
2698 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2699 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2700 | break; |
2701 | } | |
2702 | } | |
2703 | ||
2704 | ||
e041f13d ILT |
2705 | // Report an unsupported relocation against a global symbol. |
2706 | ||
fc51264f | 2707 | template<int size> |
e041f13d | 2708 | void |
fc51264f L |
2709 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
2710 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
2711 | unsigned int r_type, |
2712 | Symbol* gsym) | |
e041f13d | 2713 | { |
75f2446e | 2714 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2715 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
2716 | } |
2717 | ||
ce97fa81 | 2718 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 2719 | template<int size> |
21bb3914 | 2720 | inline bool |
fc51264f | 2721 | Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type) |
21bb3914 | 2722 | { |
21bb3914 ST |
2723 | switch (r_type) |
2724 | { | |
2725 | case elfcpp::R_X86_64_64: | |
2726 | case elfcpp::R_X86_64_32: | |
2727 | case elfcpp::R_X86_64_32S: | |
2728 | case elfcpp::R_X86_64_16: | |
2729 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
2730 | case elfcpp::R_X86_64_GOT64: |
2731 | case elfcpp::R_X86_64_GOT32: | |
2732 | case elfcpp::R_X86_64_GOTPCREL64: | |
2733 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
2734 | case elfcpp::R_X86_64_GOTPCRELX: |
2735 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ce97fa81 | 2736 | case elfcpp::R_X86_64_GOTPLT64: |
21bb3914 | 2737 | { |
2e702c99 | 2738 | return true; |
21bb3914 ST |
2739 | } |
2740 | } | |
2741 | return false; | |
2742 | } | |
2743 | ||
2744 | // For safe ICF, scan a relocation for a local symbol to check if it | |
2745 | // corresponds to a function pointer being taken. In that case mark | |
2746 | // the function whose pointer was taken as not foldable. | |
2747 | ||
fc51264f | 2748 | template<int size> |
21bb3914 | 2749 | inline bool |
fc51264f | 2750 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
2751 | Symbol_table* , |
2752 | Layout* , | |
fc51264f L |
2753 | Target_x86_64<size>* , |
2754 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2755 | unsigned int , |
2756 | Output_section* , | |
fc51264f | 2757 | const elfcpp::Rela<size, false>& , |
21bb3914 | 2758 | unsigned int r_type, |
fc51264f | 2759 | const elfcpp::Sym<size, false>&) |
21bb3914 ST |
2760 | { |
2761 | // When building a shared library, do not fold any local symbols as it is | |
2762 | // not possible to distinguish pointer taken versus a call by looking at | |
2763 | // the relocation types. | |
2764 | return (parameters->options().shared() | |
2e702c99 | 2765 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2766 | } |
2767 | ||
2768 | // For safe ICF, scan a relocation for a global symbol to check if it | |
2769 | // corresponds to a function pointer being taken. In that case mark | |
2770 | // the function whose pointer was taken as not foldable. | |
2771 | ||
fc51264f | 2772 | template<int size> |
21bb3914 | 2773 | inline bool |
fc51264f | 2774 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
2775 | Symbol_table*, |
2776 | Layout* , | |
fc51264f L |
2777 | Target_x86_64<size>* , |
2778 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2779 | unsigned int , |
2780 | Output_section* , | |
fc51264f | 2781 | const elfcpp::Rela<size, false>& , |
21bb3914 ST |
2782 | unsigned int r_type, |
2783 | Symbol* gsym) | |
2784 | { | |
2785 | // When building a shared library, do not fold symbols whose visibility | |
2786 | // is hidden, internal or protected. | |
2787 | return ((parameters->options().shared() | |
2e702c99 | 2788 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
21bb3914 ST |
2789 | || gsym->visibility() == elfcpp::STV_PROTECTED |
2790 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
2e702c99 | 2791 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2792 | } |
2793 | ||
2e30d253 ILT |
2794 | // Scan a relocation for a global symbol. |
2795 | ||
fc51264f | 2796 | template<int size> |
2e30d253 | 2797 | inline void |
fc51264f | 2798 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2799 | Layout* layout, |
2800 | Target_x86_64<size>* target, | |
2801 | Sized_relobj_file<size, false>* object, | |
2802 | unsigned int data_shndx, | |
2803 | Output_section* output_section, | |
2804 | const elfcpp::Rela<size, false>& reloc, | |
2805 | unsigned int r_type, | |
2806 | Symbol* gsym) | |
2e30d253 | 2807 | { |
7223e9ca ILT |
2808 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2809 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2810 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2811 | target->make_plt_entry(symtab, layout, gsym); | |
2812 | ||
2e30d253 ILT |
2813 | switch (r_type) |
2814 | { | |
2815 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2816 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2817 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2818 | break; |
2819 | ||
2820 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
2821 | case elfcpp::R_X86_64_32: |
2822 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 2823 | case elfcpp::R_X86_64_16: |
2e30d253 | 2824 | case elfcpp::R_X86_64_8: |
96f2030e | 2825 | { |
2e702c99 RM |
2826 | // Make a PLT entry if necessary. |
2827 | if (gsym->needs_plt_entry()) | |
2828 | { | |
2829 | target->make_plt_entry(symtab, layout, gsym); | |
2830 | // Since this is not a PC-relative relocation, we may be | |
2831 | // taking the address of a function. In that case we need to | |
2832 | // set the entry in the dynamic symbol table to the address of | |
2833 | // the PLT entry. | |
2834 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2835 | gsym->set_needs_dynsym_value(); | |
2836 | } | |
2837 | // Make a dynamic relocation if necessary. | |
2838 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2839 | { | |
a82bef93 ST |
2840 | if (!parameters->options().output_is_position_independent() |
2841 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2842 | { |
2843 | target->copy_reloc(symtab, layout, object, | |
2844 | data_shndx, output_section, gsym, reloc); | |
2845 | } | |
1bae613c L |
2846 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2847 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
7223e9ca ILT |
2848 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2849 | && gsym->can_use_relative_reloc(false) | |
2850 | && !gsym->is_from_dynobj() | |
2851 | && !gsym->is_undefined() | |
2852 | && !gsym->is_preemptible()) | |
2853 | { | |
2854 | // Use an IRELATIVE reloc for a locally defined | |
2855 | // STT_GNU_IFUNC symbol. This makes a function | |
2856 | // address in a PIE executable match the address in a | |
2857 | // shared library that it links against. | |
67181c72 ILT |
2858 | Reloc_section* rela_dyn = |
2859 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
2860 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
2861 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
2862 | output_section, object, | |
2863 | data_shndx, | |
2864 | reloc.get_r_offset(), | |
2865 | reloc.get_r_addend()); | |
2866 | } | |
b14016f0 L |
2867 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2868 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
2e702c99 RM |
2869 | && gsym->can_use_relative_reloc(false)) |
2870 | { | |
2871 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2872 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
2873 | output_section, object, | |
2874 | data_shndx, | |
2875 | reloc.get_r_offset(), | |
13cf9988 | 2876 | reloc.get_r_addend(), false); |
2e702c99 RM |
2877 | } |
2878 | else | |
2879 | { | |
2880 | this->check_non_pic(object, r_type, gsym); | |
2881 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2882 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2883 | data_shndx, reloc.get_r_offset(), | |
2884 | reloc.get_r_addend()); | |
2885 | } | |
2886 | } | |
d61c6bd4 ILT |
2887 | } |
2888 | break; | |
2889 | ||
2890 | case elfcpp::R_X86_64_PC64: | |
2891 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2892 | case elfcpp::R_X86_64_PC32_BND: |
d61c6bd4 ILT |
2893 | case elfcpp::R_X86_64_PC16: |
2894 | case elfcpp::R_X86_64_PC8: | |
2895 | { | |
2e702c99 RM |
2896 | // Make a PLT entry if necessary. |
2897 | if (gsym->needs_plt_entry()) | |
2898 | target->make_plt_entry(symtab, layout, gsym); | |
2899 | // Make a dynamic relocation if necessary. | |
2900 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2901 | { | |
a82bef93 ST |
2902 | if (parameters->options().output_is_executable() |
2903 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2904 | { |
2905 | target->copy_reloc(symtab, layout, object, | |
2906 | data_shndx, output_section, gsym, reloc); | |
2907 | } | |
2908 | else | |
2909 | { | |
2910 | this->check_non_pic(object, r_type, gsym); | |
2911 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2912 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2913 | data_shndx, reloc.get_r_offset(), | |
2914 | reloc.get_r_addend()); | |
2915 | } | |
2916 | } | |
d61c6bd4 | 2917 | } |
2e30d253 ILT |
2918 | break; |
2919 | ||
ff006520 | 2920 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 2921 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
2922 | case elfcpp::R_X86_64_GOTPCREL64: |
2923 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
2924 | case elfcpp::R_X86_64_GOTPCRELX: |
2925 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
ff006520 | 2926 | case elfcpp::R_X86_64_GOTPLT64: |
2e30d253 | 2927 | { |
2e702c99 RM |
2928 | // The symbol requires a GOT entry. |
2929 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
1fa29f10 IT |
2930 | |
2931 | // If we convert this from | |
2932 | // mov foo@GOTPCREL(%rip), %reg | |
2933 | // to lea foo(%rip), %reg. | |
2934 | // in Relocate::relocate, then there is nothing to do here. | |
2891b491 L |
2935 | if ((r_type == elfcpp::R_X86_64_GOTPCREL |
2936 | || r_type == elfcpp::R_X86_64_GOTPCRELX | |
2937 | || r_type == elfcpp::R_X86_64_REX_GOTPCRELX) | |
1fa29f10 IT |
2938 | && reloc.get_r_offset() >= 2 |
2939 | && Target_x86_64<size>::can_convert_mov_to_lea(gsym)) | |
2940 | { | |
2941 | section_size_type stype; | |
2942 | const unsigned char* view = object->section_contents(data_shndx, | |
2943 | &stype, true); | |
2944 | if (view[reloc.get_r_offset() - 2] == 0x8b) | |
2945 | break; | |
2946 | } | |
2947 | ||
2e702c99 | 2948 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2949 | { |
2950 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2951 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2952 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2953 | else | |
2954 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2955 | } | |
2e702c99 RM |
2956 | else |
2957 | { | |
2958 | // If this symbol is not fully resolved, we need to add a | |
2959 | // dynamic relocation for it. | |
2960 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
07aa62f2 ILT |
2961 | |
2962 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2963 | // | |
2964 | // 1) The symbol may be defined in some other module. | |
2965 | // | |
2966 | // 2) We are building a shared library and this is a | |
2967 | // protected symbol; using GLOB_DAT means that the dynamic | |
2968 | // linker can use the address of the PLT in the main | |
2969 | // executable when appropriate so that function address | |
2970 | // comparisons work. | |
2971 | // | |
2972 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2973 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
2974 | if (gsym->is_from_dynobj() |
2975 | || gsym->is_undefined() | |
2976 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2977 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2978 | && parameters->options().shared()) | |
7223e9ca ILT |
2979 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2980 | && parameters->options().output_is_position_independent())) | |
2e702c99 | 2981 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
83896202 | 2982 | elfcpp::R_X86_64_GLOB_DAT); |
2e702c99 RM |
2983 | else |
2984 | { | |
7223e9ca ILT |
2985 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2986 | // offset into the GOT, so that function pointer | |
2987 | // comparisons work correctly. | |
2988 | bool is_new; | |
2989 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2990 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2991 | else | |
2992 | { | |
2993 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2994 | // Tell the dynamic linker to use the PLT address | |
2995 | // when resolving relocations. | |
2996 | if (gsym->is_from_dynobj() | |
2997 | && !parameters->options().shared()) | |
2998 | gsym->set_needs_dynsym_value(); | |
2999 | } | |
2e702c99 | 3000 | if (is_new) |
7223e9ca ILT |
3001 | { |
3002 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
3003 | rela_dyn->add_global_relative(gsym, | |
3004 | elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 3005 | got, got_off, 0, false); |
7223e9ca | 3006 | } |
2e702c99 RM |
3007 | } |
3008 | } | |
2e30d253 ILT |
3009 | } |
3010 | break; | |
3011 | ||
3012 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 3013 | case elfcpp::R_X86_64_PLT32_BND: |
2e30d253 ILT |
3014 | // If the symbol is fully resolved, this is just a PC32 reloc. |
3015 | // Otherwise we need a PLT entry. | |
3016 | if (gsym->final_value_is_known()) | |
3017 | break; | |
96f2030e ILT |
3018 | // If building a shared library, we can also skip the PLT entry |
3019 | // if the symbol is defined in the output file and is protected | |
3020 | // or hidden. | |
3021 | if (gsym->is_defined() | |
2e702c99 RM |
3022 | && !gsym->is_from_dynobj() |
3023 | && !gsym->is_preemptible()) | |
96f2030e | 3024 | break; |
2e30d253 ILT |
3025 | target->make_plt_entry(symtab, layout, gsym); |
3026 | break; | |
3027 | ||
fdc2f80f | 3028 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 3029 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
3030 | case elfcpp::R_X86_64_GOTPC64: |
3031 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
3032 | // We need a GOT section. |
3033 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
3034 | // For PLTOFF64, we also need a PLT entry (but only if the |
3035 | // symbol is not fully resolved). | |
3036 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
3037 | && !gsym->final_value_is_known()) | |
3038 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
3039 | break; |
3040 | ||
2e30d253 ILT |
3041 | case elfcpp::R_X86_64_COPY: |
3042 | case elfcpp::R_X86_64_GLOB_DAT: | |
3043 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3044 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3045 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3046 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 3047 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3048 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 3049 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3050 | gold_error(_("%s: unexpected reloc %u in object file"), |
3051 | object->name().c_str(), r_type); | |
2e30d253 | 3052 | break; |
2e30d253 | 3053 | |
d61c17ea | 3054 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
3055 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3056 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3057 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3058 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3059 | case elfcpp::R_X86_64_DTPOFF32: |
3060 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3061 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3062 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 3063 | { |
65d92137 CC |
3064 | // For the Initial-Exec model, we can treat undef symbols as final |
3065 | // when building an executable. | |
3066 | const bool is_final = (gsym->final_value_is_known() || | |
3067 | (r_type == elfcpp::R_X86_64_GOTTPOFF && | |
3068 | gsym->is_undefined() && | |
3069 | parameters->options().output_is_executable())); | |
e041f13d | 3070 | const tls::Tls_optimization optimized_type |
2e702c99 | 3071 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3072 | switch (r_type) |
3073 | { | |
2e702c99 | 3074 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
3075 | if (optimized_type == tls::TLSOPT_NONE) |
3076 | { | |
2e702c99 RM |
3077 | // Create a pair of GOT entries for the module index and |
3078 | // dtv-relative offset. | |
3079 | Output_data_got<64, false>* got | |
3080 | = target->got_section(symtab, layout); | |
3081 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
83896202 ILT |
3082 | target->rela_dyn_section(layout), |
3083 | elfcpp::R_X86_64_DTPMOD64, | |
3084 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
3085 | } |
3086 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3087 | { | |
2e702c99 RM |
3088 | // Create a GOT entry for the tp-relative offset. |
3089 | Output_data_got<64, false>* got | |
3090 | = target->got_section(symtab, layout); | |
3091 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3092 | target->rela_dyn_section(layout), |
3093 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
3094 | } |
3095 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3096 | unsupported_reloc_global(object, r_type, gsym); | |
3097 | break; | |
3098 | ||
2e702c99 RM |
3099 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
3100 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
3101 | if (optimized_type == tls::TLSOPT_NONE) |
3102 | { | |
2e702c99 RM |
3103 | // Create reserved PLT and GOT entries for the resolver. |
3104 | target->reserve_tlsdesc_entries(symtab, layout); | |
3105 | ||
3106 | // Create a double GOT entry with an R_X86_64_TLSDESC | |
3107 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
3108 | // lazily, so the GOT entry needs to be in an area in | |
3109 | // .got.plt, not .got. Call got_section to make sure | |
3110 | // the section has been created. | |
a8df5856 | 3111 | target->got_section(symtab, layout); |
2e702c99 | 3112 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
ca09d69a | 3113 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
2e702c99 | 3114 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
83896202 | 3115 | elfcpp::R_X86_64_TLSDESC, 0); |
c2b45e22 CC |
3116 | } |
3117 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3118 | { | |
2e702c99 RM |
3119 | // Create a GOT entry for the tp-relative offset. |
3120 | Output_data_got<64, false>* got | |
3121 | = target->got_section(symtab, layout); | |
3122 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3123 | target->rela_dyn_section(layout), |
3124 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
3125 | } |
3126 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3127 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
3128 | break; |
3129 | ||
2e702c99 | 3130 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3131 | break; |
3132 | ||
2e702c99 | 3133 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3134 | if (optimized_type == tls::TLSOPT_NONE) |
3135 | { | |
2e702c99 RM |
3136 | // Create a GOT entry for the module index. |
3137 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3138 | } |
3139 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3140 | unsupported_reloc_global(object, r_type, gsym); | |
3141 | break; | |
3142 | ||
2e702c99 RM |
3143 | case elfcpp::R_X86_64_DTPOFF32: |
3144 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3145 | break; |
3146 | ||
2e702c99 | 3147 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3148 | layout->set_has_static_tls(); |
2e702c99 RM |
3149 | if (optimized_type == tls::TLSOPT_NONE) |
3150 | { | |
3151 | // Create a GOT entry for the tp-relative offset. | |
3152 | Output_data_got<64, false>* got | |
3153 | = target->got_section(symtab, layout); | |
3154 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3155 | target->rela_dyn_section(layout), |
3156 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3157 | } |
3158 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3159 | unsupported_reloc_global(object, r_type, gsym); | |
3160 | break; | |
0ffd9845 | 3161 | |
2e702c99 | 3162 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3163 | layout->set_has_static_tls(); |
2e702c99 | 3164 | if (parameters->options().shared()) |
b1759dce | 3165 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 | 3166 | break; |
e041f13d | 3167 | |
2e702c99 RM |
3168 | default: |
3169 | gold_unreachable(); | |
2e30d253 ILT |
3170 | } |
3171 | } | |
3172 | break; | |
fdc2f80f ILT |
3173 | |
3174 | case elfcpp::R_X86_64_SIZE32: | |
3175 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3176 | default: |
75f2446e | 3177 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3178 | object->name().c_str(), r_type, |
2e702c99 | 3179 | gsym->demangled_name().c_str()); |
2e30d253 ILT |
3180 | break; |
3181 | } | |
3182 | } | |
3183 | ||
fc51264f | 3184 | template<int size> |
6d03d481 | 3185 | void |
fc51264f L |
3186 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
3187 | Layout* layout, | |
3188 | Sized_relobj_file<size, false>* object, | |
3189 | unsigned int data_shndx, | |
3190 | unsigned int sh_type, | |
3191 | const unsigned char* prelocs, | |
3192 | size_t reloc_count, | |
3193 | Output_section* output_section, | |
3194 | bool needs_special_offset_handling, | |
3195 | size_t local_symbol_count, | |
3196 | const unsigned char* plocal_symbols) | |
6d03d481 | 3197 | { |
4d625b70 CC |
3198 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
3199 | Classify_reloc; | |
6d03d481 ST |
3200 | |
3201 | if (sh_type == elfcpp::SHT_REL) | |
3202 | { | |
3203 | return; | |
3204 | } | |
3205 | ||
4d625b70 CC |
3206 | gold::gc_process_relocs<size, false, Target_x86_64<size>, Scan, |
3207 | Classify_reloc>( | |
6d03d481 ST |
3208 | symtab, |
3209 | layout, | |
3210 | this, | |
3211 | object, | |
3212 | data_shndx, | |
3213 | prelocs, | |
3214 | reloc_count, | |
3215 | output_section, | |
3216 | needs_special_offset_handling, | |
3217 | local_symbol_count, | |
3218 | plocal_symbols); | |
2e702c99 | 3219 | |
6d03d481 | 3220 | } |
2e30d253 ILT |
3221 | // Scan relocations for a section. |
3222 | ||
fc51264f | 3223 | template<int size> |
2e30d253 | 3224 | void |
fc51264f L |
3225 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
3226 | Layout* layout, | |
3227 | Sized_relobj_file<size, false>* object, | |
3228 | unsigned int data_shndx, | |
3229 | unsigned int sh_type, | |
3230 | const unsigned char* prelocs, | |
3231 | size_t reloc_count, | |
3232 | Output_section* output_section, | |
3233 | bool needs_special_offset_handling, | |
3234 | size_t local_symbol_count, | |
3235 | const unsigned char* plocal_symbols) | |
2e30d253 | 3236 | { |
4d625b70 CC |
3237 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
3238 | Classify_reloc; | |
3239 | ||
2e30d253 ILT |
3240 | if (sh_type == elfcpp::SHT_REL) |
3241 | { | |
75f2446e ILT |
3242 | gold_error(_("%s: unsupported REL reloc section"), |
3243 | object->name().c_str()); | |
3244 | return; | |
2e30d253 ILT |
3245 | } |
3246 | ||
4d625b70 | 3247 | gold::scan_relocs<size, false, Target_x86_64<size>, Scan, Classify_reloc>( |
2e30d253 ILT |
3248 | symtab, |
3249 | layout, | |
3250 | this, | |
3251 | object, | |
3252 | data_shndx, | |
3253 | prelocs, | |
3254 | reloc_count, | |
730cdc88 ILT |
3255 | output_section, |
3256 | needs_special_offset_handling, | |
2e30d253 | 3257 | local_symbol_count, |
730cdc88 | 3258 | plocal_symbols); |
2e30d253 ILT |
3259 | } |
3260 | ||
3261 | // Finalize the sections. | |
3262 | ||
fc51264f | 3263 | template<int size> |
2e30d253 | 3264 | void |
fc51264f | 3265 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
3266 | Layout* layout, |
3267 | const Input_objects*, | |
e785ec03 | 3268 | Symbol_table* symtab) |
2e30d253 | 3269 | { |
ea715a34 ILT |
3270 | const Reloc_section* rel_plt = (this->plt_ == NULL |
3271 | ? NULL | |
e291e7b9 | 3272 | : this->plt_->rela_plt()); |
ea715a34 | 3273 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 3274 | this->rela_dyn_, true, false); |
2e702c99 | 3275 | |
2e30d253 ILT |
3276 | // Fill in some more dynamic tags. |
3277 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
3278 | if (odyn != NULL) | |
3279 | { | |
22b127cc | 3280 | if (this->plt_ != NULL |
ea715a34 ILT |
3281 | && this->plt_->output_section() != NULL |
3282 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 3283 | { |
ea715a34 ILT |
3284 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
3285 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
3286 | this->got_->finalize_data_size(); | |
3287 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
3288 | this->plt_, plt_offset); | |
3289 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
3290 | this->got_, got_offset); | |
2e30d253 ILT |
3291 | } |
3292 | } | |
3293 | ||
3294 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
3295 | // relocs. | |
12c0daef ILT |
3296 | if (this->copy_relocs_.any_saved_relocs()) |
3297 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
3298 | |
3299 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
3300 | // the .got.plt section. | |
3301 | Symbol* sym = this->global_offset_table_; | |
3302 | if (sym != NULL) | |
3303 | { | |
3304 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 3305 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 3306 | } |
28a13fec | 3307 | |
67181c72 ILT |
3308 | if (parameters->doing_static_link() |
3309 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
3310 | { |
3311 | // If linking statically, make sure that the __rela_iplt symbols | |
3312 | // were defined if necessary, even if we didn't create a PLT. | |
3313 | static const Define_symbol_in_segment syms[] = | |
3314 | { | |
3315 | { | |
3316 | "__rela_iplt_start", // name | |
3317 | elfcpp::PT_LOAD, // segment_type | |
3318 | elfcpp::PF_W, // segment_flags_set | |
3319 | elfcpp::PF(0), // segment_flags_clear | |
3320 | 0, // value | |
3321 | 0, // size | |
3322 | elfcpp::STT_NOTYPE, // type | |
3323 | elfcpp::STB_GLOBAL, // binding | |
3324 | elfcpp::STV_HIDDEN, // visibility | |
3325 | 0, // nonvis | |
3326 | Symbol::SEGMENT_START, // offset_from_base | |
3327 | true // only_if_ref | |
3328 | }, | |
3329 | { | |
3330 | "__rela_iplt_end", // name | |
3331 | elfcpp::PT_LOAD, // segment_type | |
3332 | elfcpp::PF_W, // segment_flags_set | |
3333 | elfcpp::PF(0), // segment_flags_clear | |
3334 | 0, // value | |
3335 | 0, // size | |
3336 | elfcpp::STT_NOTYPE, // type | |
3337 | elfcpp::STB_GLOBAL, // binding | |
3338 | elfcpp::STV_HIDDEN, // visibility | |
3339 | 0, // nonvis | |
3340 | Symbol::SEGMENT_START, // offset_from_base | |
3341 | true // only_if_ref | |
3342 | } | |
3343 | }; | |
3344 | ||
3345 | symtab->define_symbols(layout, 2, syms, | |
3346 | layout->script_options()->saw_sections_clause()); | |
3347 | } | |
2e30d253 ILT |
3348 | } |
3349 | ||
3350 | // Perform a relocation. | |
3351 | ||
fc51264f | 3352 | template<int size> |
2e30d253 | 3353 | inline bool |
fc51264f L |
3354 | Target_x86_64<size>::Relocate::relocate( |
3355 | const Relocate_info<size, false>* relinfo, | |
91a65d2f | 3356 | unsigned int, |
fc51264f L |
3357 | Target_x86_64<size>* target, |
3358 | Output_section*, | |
3359 | size_t relnum, | |
91a65d2f | 3360 | const unsigned char* preloc, |
fc51264f L |
3361 | const Sized_symbol<size>* gsym, |
3362 | const Symbol_value<size>* psymval, | |
3363 | unsigned char* view, | |
3364 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3365 | section_size_type view_size) | |
2e30d253 | 3366 | { |
91a65d2f AM |
3367 | const elfcpp::Rela<size, false> rela(preloc); |
3368 | unsigned int r_type = elfcpp::elf_r_type<size>(rela.get_r_info()); | |
3369 | ||
2e30d253 ILT |
3370 | if (this->skip_call_tls_get_addr_) |
3371 | { | |
5efc7cd2 | 3372 | if ((r_type != elfcpp::R_X86_64_PLT32 |
f49fe902 L |
3373 | && r_type != elfcpp::R_X86_64_PLT32_BND |
3374 | && r_type != elfcpp::R_X86_64_PC32_BND | |
2e702c99 | 3375 | && r_type != elfcpp::R_X86_64_PC32) |
2e30d253 | 3376 | || gsym == NULL |
0ffd9845 | 3377 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 3378 | { |
75f2446e ILT |
3379 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3380 | _("missing expected TLS relocation")); | |
3381 | } | |
3382 | else | |
3383 | { | |
3384 | this->skip_call_tls_get_addr_ = false; | |
3385 | return false; | |
2e30d253 | 3386 | } |
2e30d253 ILT |
3387 | } |
3388 | ||
0e804863 ILT |
3389 | if (view == NULL) |
3390 | return true; | |
3391 | ||
fc51264f | 3392 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
3393 | |
3394 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 3395 | Symbol_value<size> symval; |
96f2030e | 3396 | if (gsym != NULL |
95a2c8d6 | 3397 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 3398 | { |
19fec8c1 | 3399 | symval.set_output_value(target->plt_address_for_global(gsym)); |
2e30d253 ILT |
3400 | psymval = &symval; |
3401 | } | |
7223e9ca ILT |
3402 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
3403 | { | |
fc51264f | 3404 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
3405 | if (object->local_has_plt_offset(r_sym)) |
3406 | { | |
19fec8c1 | 3407 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
3408 | psymval = &symval; |
3409 | } | |
3410 | } | |
2e30d253 | 3411 | |
0ffd9845 ILT |
3412 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
3413 | ||
3414 | // Get the GOT offset if needed. | |
96f2030e ILT |
3415 | // The GOT pointer points to the end of the GOT section. |
3416 | // We need to subtract the size of the GOT section to get | |
3417 | // the actual offset to use in the relocation. | |
0ffd9845 | 3418 | bool have_got_offset = false; |
c23dd342 L |
3419 | // Since the actual offset is always negative, we use signed int to |
3420 | // support 64-bit GOT relocations. | |
3421 | int got_offset = 0; | |
0ffd9845 ILT |
3422 | switch (r_type) |
3423 | { | |
3424 | case elfcpp::R_X86_64_GOT32: | |
3425 | case elfcpp::R_X86_64_GOT64: | |
3426 | case elfcpp::R_X86_64_GOTPLT64: | |
0ffd9845 ILT |
3427 | case elfcpp::R_X86_64_GOTPCREL64: |
3428 | if (gsym != NULL) | |
2e702c99 RM |
3429 | { |
3430 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3431 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
3432 | } | |
0ffd9845 | 3433 | else |
2e702c99 RM |
3434 | { |
3435 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3436 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3437 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3438 | - target->got_size()); | |
3439 | } | |
0ffd9845 ILT |
3440 | have_got_offset = true; |
3441 | break; | |
3442 | ||
3443 | default: | |
3444 | break; | |
3445 | } | |
2e30d253 ILT |
3446 | |
3447 | switch (r_type) | |
3448 | { | |
3449 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3450 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3451 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3452 | break; |
3453 | ||
3454 | case elfcpp::R_X86_64_64: | |
fc51264f | 3455 | Relocate_functions<size, false>::rela64(view, object, psymval, addend); |
2e30d253 ILT |
3456 | break; |
3457 | ||
3458 | case elfcpp::R_X86_64_PC64: | |
fc51264f | 3459 | Relocate_functions<size, false>::pcrela64(view, object, psymval, addend, |
2e702c99 | 3460 | address); |
2e30d253 ILT |
3461 | break; |
3462 | ||
3463 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
3464 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3465 | // uint64_t x = value + addend; | |
3466 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
3467 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
fc51264f | 3468 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3469 | break; |
3470 | ||
3471 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
3472 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3473 | // int64_t x = value + addend; // note this quantity is signed! | |
3474 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
fc51264f | 3475 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3476 | break; |
3477 | ||
3478 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 3479 | case elfcpp::R_X86_64_PC32_BND: |
fc51264f L |
3480 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3481 | address); | |
2e30d253 ILT |
3482 | break; |
3483 | ||
3484 | case elfcpp::R_X86_64_16: | |
fc51264f | 3485 | Relocate_functions<size, false>::rela16(view, object, psymval, addend); |
2e30d253 ILT |
3486 | break; |
3487 | ||
3488 | case elfcpp::R_X86_64_PC16: | |
fc51264f L |
3489 | Relocate_functions<size, false>::pcrela16(view, object, psymval, addend, |
3490 | address); | |
2e30d253 ILT |
3491 | break; |
3492 | ||
3493 | case elfcpp::R_X86_64_8: | |
fc51264f | 3494 | Relocate_functions<size, false>::rela8(view, object, psymval, addend); |
2e30d253 ILT |
3495 | break; |
3496 | ||
3497 | case elfcpp::R_X86_64_PC8: | |
fc51264f L |
3498 | Relocate_functions<size, false>::pcrela8(view, object, psymval, addend, |
3499 | address); | |
2e30d253 ILT |
3500 | break; |
3501 | ||
3502 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 3503 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 | 3504 | gold_assert(gsym == NULL |
2e702c99 | 3505 | || gsym->has_plt_offset() |
99f8faca ILT |
3506 | || gsym->final_value_is_known() |
3507 | || (gsym->is_defined() | |
3508 | && !gsym->is_from_dynobj() | |
3509 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
3510 | // Note: while this code looks the same as for R_X86_64_PC32, it |
3511 | // behaves differently because psymval was set to point to | |
3512 | // the PLT entry, rather than the symbol, in Scan::global(). | |
fc51264f L |
3513 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3514 | address); | |
2e30d253 ILT |
3515 | break; |
3516 | ||
ee9e9e86 ILT |
3517 | case elfcpp::R_X86_64_PLTOFF64: |
3518 | { | |
2e702c99 RM |
3519 | gold_assert(gsym); |
3520 | gold_assert(gsym->has_plt_offset() | |
3521 | || gsym->final_value_is_known()); | |
fc51264f | 3522 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
c23dd342 L |
3523 | // This is the address of GLOBAL_OFFSET_TABLE. |
3524 | got_address = target->got_plt_section()->address(); | |
fc51264f L |
3525 | Relocate_functions<size, false>::rela64(view, object, psymval, |
3526 | addend - got_address); | |
ee9e9e86 | 3527 | } |
7849f6d8 | 3528 | break; |
ee9e9e86 | 3529 | |
2e30d253 | 3530 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 3531 | gold_assert(have_got_offset); |
fc51264f | 3532 | Relocate_functions<size, false>::rela32(view, got_offset, addend); |
2e30d253 ILT |
3533 | break; |
3534 | ||
e822f2b1 ILT |
3535 | case elfcpp::R_X86_64_GOTPC32: |
3536 | { | |
2e702c99 | 3537 | gold_assert(gsym); |
fc51264f | 3538 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3539 | value = target->got_plt_section()->address(); |
fc51264f | 3540 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
e822f2b1 ILT |
3541 | } |
3542 | break; | |
3543 | ||
3544 | case elfcpp::R_X86_64_GOT64: | |
fdc2f80f | 3545 | case elfcpp::R_X86_64_GOTPLT64: |
e88ba8d5 L |
3546 | // R_X86_64_GOTPLT64 is obsolete and treated the the same as |
3547 | // GOT64. | |
0ffd9845 | 3548 | gold_assert(have_got_offset); |
fc51264f | 3549 | Relocate_functions<size, false>::rela64(view, got_offset, addend); |
e822f2b1 ILT |
3550 | break; |
3551 | ||
3552 | case elfcpp::R_X86_64_GOTPC64: | |
3553 | { | |
2e702c99 | 3554 | gold_assert(gsym); |
fc51264f | 3555 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3556 | value = target->got_plt_section()->address(); |
fc51264f | 3557 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
3558 | } |
3559 | break; | |
3560 | ||
2e30d253 ILT |
3561 | case elfcpp::R_X86_64_GOTOFF64: |
3562 | { | |
fc51264f | 3563 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
2e30d253 | 3564 | value = (psymval->value(object, 0) |
96f2030e | 3565 | - target->got_plt_section()->address()); |
fc51264f | 3566 | Relocate_functions<size, false>::rela64(view, value, addend); |
2e30d253 ILT |
3567 | } |
3568 | break; | |
3569 | ||
3570 | case elfcpp::R_X86_64_GOTPCREL: | |
2891b491 L |
3571 | case elfcpp::R_X86_64_GOTPCRELX: |
3572 | case elfcpp::R_X86_64_REX_GOTPCRELX: | |
2e30d253 | 3573 | { |
1fa29f10 IT |
3574 | // Convert |
3575 | // mov foo@GOTPCREL(%rip), %reg | |
3576 | // to lea foo(%rip), %reg. | |
3577 | // if possible. | |
3578 | if (rela.get_r_offset() >= 2 | |
3579 | && view[-2] == 0x8b | |
3580 | && ((gsym == NULL && !psymval->is_ifunc_symbol()) | |
3581 | || (gsym != NULL | |
3582 | && Target_x86_64<size>::can_convert_mov_to_lea(gsym)))) | |
3583 | { | |
3584 | view[-2] = 0x8d; | |
3585 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, | |
3586 | address); | |
3587 | } | |
3588 | else | |
3589 | { | |
3590 | if (gsym != NULL) | |
3591 | { | |
3592 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3593 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
3594 | } | |
3595 | else | |
3596 | { | |
3597 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3598 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3599 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3600 | - target->got_size()); | |
3601 | } | |
3602 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3603 | value = target->got_plt_section()->address() + got_offset; | |
3604 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); | |
3605 | } | |
2e30d253 ILT |
3606 | } |
3607 | break; | |
3608 | ||
e822f2b1 ILT |
3609 | case elfcpp::R_X86_64_GOTPCREL64: |
3610 | { | |
2e702c99 RM |
3611 | gold_assert(have_got_offset); |
3612 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3613 | value = target->got_plt_section()->address() + got_offset; | |
3614 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); | |
e822f2b1 ILT |
3615 | } |
3616 | break; | |
3617 | ||
2e30d253 ILT |
3618 | case elfcpp::R_X86_64_COPY: |
3619 | case elfcpp::R_X86_64_GLOB_DAT: | |
3620 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3621 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3622 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3623 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3624 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3625 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3626 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3627 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3628 | _("unexpected reloc %u in object file"), | |
3629 | r_type); | |
2e30d253 ILT |
3630 | break; |
3631 | ||
d61c17ea | 3632 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3633 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3634 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3635 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3636 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3637 | case elfcpp::R_X86_64_DTPOFF32: |
3638 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3639 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3640 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 | 3641 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2e702c99 | 3642 | view, address, view_size); |
2e30d253 | 3643 | break; |
2e30d253 | 3644 | |
fdc2f80f ILT |
3645 | case elfcpp::R_X86_64_SIZE32: |
3646 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3647 | default: |
75f2446e ILT |
3648 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3649 | _("unsupported reloc %u"), | |
3650 | r_type); | |
2e30d253 ILT |
3651 | break; |
3652 | } | |
3653 | ||
3654 | return true; | |
3655 | } | |
3656 | ||
3657 | // Perform a TLS relocation. | |
3658 | ||
fc51264f | 3659 | template<int size> |
2e30d253 | 3660 | inline void |
fc51264f L |
3661 | Target_x86_64<size>::Relocate::relocate_tls( |
3662 | const Relocate_info<size, false>* relinfo, | |
3663 | Target_x86_64<size>* target, | |
3664 | size_t relnum, | |
3665 | const elfcpp::Rela<size, false>& rela, | |
3666 | unsigned int r_type, | |
3667 | const Sized_symbol<size>* gsym, | |
3668 | const Symbol_value<size>* psymval, | |
3669 | unsigned char* view, | |
3670 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3671 | section_size_type view_size) | |
2e30d253 | 3672 | { |
2e30d253 | 3673 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 3674 | |
fc51264f | 3675 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 3676 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 3677 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 3678 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 3679 | |
fc51264f | 3680 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
3681 | |
3682 | const bool is_final = (gsym == NULL | |
b3705d2a | 3683 | ? !parameters->options().shared() |
2e30d253 | 3684 | : gsym->final_value_is_known()); |
36171d64 | 3685 | tls::Tls_optimization optimized_type |
fc51264f | 3686 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3687 | switch (r_type) |
3688 | { | |
56622147 | 3689 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
3690 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3691 | { | |
3692 | // If this code sequence is used in a non-executable section, | |
3693 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
3694 | // on the assumption that it's being used by itself in a debug | |
3695 | // section. Therefore, in the unlikely event that the code | |
3696 | // sequence appears in a non-executable section, we simply | |
3697 | // leave it unoptimized. | |
3698 | optimized_type = tls::TLSOPT_NONE; | |
3699 | } | |
e041f13d | 3700 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 3701 | { |
62855347 ILT |
3702 | if (tls_segment == NULL) |
3703 | { | |
191f1a2d ILT |
3704 | gold_assert(parameters->errors()->error_count() > 0 |
3705 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3706 | return; |
3707 | } | |
2e30d253 | 3708 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 3709 | rela, r_type, value, view, |
2e30d253 ILT |
3710 | view_size); |
3711 | break; | |
3712 | } | |
7bf1f802 | 3713 | else |
2e702c99 RM |
3714 | { |
3715 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3716 | ? GOT_TYPE_TLS_OFFSET | |
3717 | : GOT_TYPE_TLS_PAIR); | |
3718 | unsigned int got_offset; | |
3719 | if (gsym != NULL) | |
3720 | { | |
3721 | gold_assert(gsym->has_got_offset(got_type)); | |
3722 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
3723 | } | |
3724 | else | |
3725 | { | |
3726 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3727 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3728 | got_offset = (object->local_got_offset(r_sym, got_type) | |
3729 | - target->got_size()); | |
3730 | } | |
3731 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3732 | { | |
3733 | value = target->got_plt_section()->address() + got_offset; | |
d21f123b | 3734 | this->tls_gd_to_ie(relinfo, relnum, rela, r_type, |
2e702c99 RM |
3735 | value, view, address, view_size); |
3736 | break; | |
3737 | } | |
3738 | else if (optimized_type == tls::TLSOPT_NONE) | |
3739 | { | |
3740 | // Relocate the field with the offset of the pair of GOT | |
3741 | // entries. | |
6a41d30b | 3742 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3743 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3744 | address); |
2e702c99 RM |
3745 | break; |
3746 | } | |
3747 | } | |
72ec2876 | 3748 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3749 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
3750 | break; |
3751 | ||
c2b45e22 CC |
3752 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
3753 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
3754 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3755 | { | |
3756 | // See above comment for R_X86_64_TLSGD. | |
3757 | optimized_type = tls::TLSOPT_NONE; | |
3758 | } | |
c2b45e22 CC |
3759 | if (optimized_type == tls::TLSOPT_TO_LE) |
3760 | { | |
62855347 ILT |
3761 | if (tls_segment == NULL) |
3762 | { | |
191f1a2d ILT |
3763 | gold_assert(parameters->errors()->error_count() > 0 |
3764 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3765 | return; |
3766 | } | |
c2b45e22 | 3767 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3768 | rela, r_type, value, view, |
3769 | view_size); | |
c2b45e22 CC |
3770 | break; |
3771 | } | |
3772 | else | |
2e702c99 RM |
3773 | { |
3774 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3775 | ? GOT_TYPE_TLS_OFFSET | |
3776 | : GOT_TYPE_TLS_DESC); | |
3777 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3778 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC |
3779 | && optimized_type == tls::TLSOPT_NONE) | |
3780 | { | |
3781 | // We created GOT entries in the .got.tlsdesc portion of | |
3782 | // the .got.plt section, but the offset stored in the | |
3783 | // symbol is the offset within .got.tlsdesc. | |
3784 | got_offset = (target->got_size() | |
3785 | + target->got_plt_section()->data_size()); | |
3786 | } | |
2e702c99 RM |
3787 | if (gsym != NULL) |
3788 | { | |
3789 | gold_assert(gsym->has_got_offset(got_type)); | |
3790 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3791 | } | |
3792 | else | |
3793 | { | |
3794 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3795 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3796 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3797 | - target->got_size()); |
2e702c99 RM |
3798 | } |
3799 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3800 | { | |
2e702c99 | 3801 | value = target->got_plt_section()->address() + got_offset; |
d21f123b | 3802 | this->tls_desc_gd_to_ie(relinfo, relnum, |
2e702c99 RM |
3803 | rela, r_type, value, view, address, |
3804 | view_size); | |
3805 | break; | |
3806 | } | |
3807 | else if (optimized_type == tls::TLSOPT_NONE) | |
3808 | { | |
3809 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3810 | { | |
3811 | // Relocate the field with the offset of the pair of GOT | |
3812 | // entries. | |
3813 | value = target->got_plt_section()->address() + got_offset; | |
3814 | Relocate_functions<size, false>::pcrela32(view, value, addend, | |
fc51264f | 3815 | address); |
2e702c99 RM |
3816 | } |
3817 | break; | |
3818 | } | |
3819 | } | |
c2b45e22 CC |
3820 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3821 | _("unsupported reloc %u"), r_type); | |
3822 | break; | |
3823 | ||
56622147 | 3824 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
3825 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3826 | { | |
3827 | // See above comment for R_X86_64_TLSGD. | |
3828 | optimized_type = tls::TLSOPT_NONE; | |
3829 | } | |
e041f13d | 3830 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3831 | { |
62855347 ILT |
3832 | if (tls_segment == NULL) |
3833 | { | |
191f1a2d ILT |
3834 | gold_assert(parameters->errors()->error_count() > 0 |
3835 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3836 | return; |
3837 | } | |
72ec2876 ILT |
3838 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
3839 | value, view, view_size); | |
3840 | break; | |
2e702c99 | 3841 | } |
7bf1f802 | 3842 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3843 | { |
3844 | // Relocate the field with the offset of the GOT entry for | |
3845 | // the module index. | |
3846 | unsigned int got_offset; | |
3847 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
31d60480 | 3848 | - target->got_size()); |
6a41d30b | 3849 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3850 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3851 | address); |
2e702c99 RM |
3852 | break; |
3853 | } | |
72ec2876 | 3854 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3855 | _("unsupported reloc %u"), r_type); |
2e30d253 | 3856 | break; |
0ffd9845 ILT |
3857 | |
3858 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
3859 | // This relocation type is used in debugging information. |
3860 | // In that case we need to not optimize the value. If the | |
3861 | // section is not executable, then we assume we should not | |
3862 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
3863 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
3864 | // R_X86_64_TLSLD. | |
3865 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3866 | { | |
62855347 ILT |
3867 | if (tls_segment == NULL) |
3868 | { | |
191f1a2d ILT |
3869 | gold_assert(parameters->errors()->error_count() > 0 |
3870 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3871 | return; |
3872 | } | |
36171d64 CC |
3873 | value -= tls_segment->memsz(); |
3874 | } | |
fc51264f | 3875 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
3876 | break; |
3877 | ||
3878 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
3879 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
3880 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3881 | { | |
62855347 ILT |
3882 | if (tls_segment == NULL) |
3883 | { | |
191f1a2d ILT |
3884 | gold_assert(parameters->errors()->error_count() > 0 |
3885 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3886 | return; |
3887 | } | |
36171d64 CC |
3888 | value -= tls_segment->memsz(); |
3889 | } | |
fc51264f | 3890 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 3891 | break; |
2e30d253 | 3892 | |
56622147 | 3893 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
24dd5808 CC |
3894 | if (gsym != NULL |
3895 | && gsym->is_undefined() | |
3896 | && parameters->options().output_is_executable()) | |
65d92137 CC |
3897 | { |
3898 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, | |
3899 | NULL, rela, | |
3900 | r_type, value, view, | |
3901 | view_size); | |
3902 | break; | |
3903 | } | |
3904 | else if (optimized_type == tls::TLSOPT_TO_LE) | |
56622147 | 3905 | { |
62855347 ILT |
3906 | if (tls_segment == NULL) |
3907 | { | |
191f1a2d ILT |
3908 | gold_assert(parameters->errors()->error_count() > 0 |
3909 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3910 | return; |
3911 | } | |
fc51264f L |
3912 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
3913 | tls_segment, rela, | |
3914 | r_type, value, view, | |
3915 | view_size); | |
56622147 ILT |
3916 | break; |
3917 | } | |
7bf1f802 | 3918 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3919 | { |
3920 | // Relocate the field with the offset of the GOT entry for | |
3921 | // the tp-relative offset of the symbol. | |
3922 | unsigned int got_offset; | |
3923 | if (gsym != NULL) | |
3924 | { | |
3925 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); | |
3926 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
3927 | - target->got_size()); | |
3928 | } | |
3929 | else | |
3930 | { | |
3931 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3932 | gold_assert(object->local_has_got_offset(r_sym, | |
3933 | GOT_TYPE_TLS_OFFSET)); | |
3934 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
3935 | - target->got_size()); | |
3936 | } | |
6a41d30b | 3937 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3938 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3939 | address); |
2e702c99 RM |
3940 | break; |
3941 | } | |
56622147 ILT |
3942 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3943 | _("unsupported reloc type %u"), | |
3944 | r_type); | |
3945 | break; | |
0ffd9845 | 3946 | |
56622147 | 3947 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
3948 | if (tls_segment == NULL) |
3949 | { | |
191f1a2d ILT |
3950 | gold_assert(parameters->errors()->error_count() > 0 |
3951 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3952 | return; |
3953 | } | |
6a41d30b | 3954 | value -= tls_segment->memsz(); |
fc51264f | 3955 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 3956 | break; |
2e30d253 | 3957 | } |
2e30d253 ILT |
3958 | } |
3959 | ||
7bf1f802 ILT |
3960 | // Do a relocation in which we convert a TLS General-Dynamic to an |
3961 | // Initial-Exec. | |
3962 | ||
fc51264f | 3963 | template<int size> |
7bf1f802 | 3964 | inline void |
fc51264f L |
3965 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
3966 | const Relocate_info<size, false>* relinfo, | |
3967 | size_t relnum, | |
fc51264f L |
3968 | const elfcpp::Rela<size, false>& rela, |
3969 | unsigned int, | |
3970 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3971 | unsigned char* view, | |
3972 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3973 | section_size_type view_size) | |
7bf1f802 | 3974 | { |
41194d9f L |
3975 | // For SIZE == 64: |
3976 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3977 | // .word 0x6666; rex64; call __tls_get_addr | |
3978 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
3979 | // For SIZE == 32: | |
3980 | // leaq foo@tlsgd(%rip),%rdi; | |
3981 | // .word 0x6666; rex64; call __tls_get_addr | |
3982 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax | |
7bf1f802 | 3983 | |
7bf1f802 | 3984 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
7bf1f802 | 3985 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 3986 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
7bf1f802 | 3987 | |
41194d9f L |
3988 | if (size == 64) |
3989 | { | |
3990 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3991 | -4); | |
3992 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3993 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3994 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3995 | 16); | |
3996 | } | |
3997 | else | |
3998 | { | |
3999 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4000 | -3); | |
4001 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4002 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
4003 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
4004 | 15); | |
4005 | } | |
7bf1f802 | 4006 | |
c2b45e22 | 4007 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
4008 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
4009 | address); | |
7bf1f802 ILT |
4010 | |
4011 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4012 | // We can skip it. | |
4013 | this->skip_call_tls_get_addr_ = true; | |
4014 | } | |
4015 | ||
e041f13d | 4016 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
4017 | // Local-Exec. |
4018 | ||
fc51264f | 4019 | template<int size> |
2e30d253 | 4020 | inline void |
fc51264f L |
4021 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
4022 | const Relocate_info<size, false>* relinfo, | |
4023 | size_t relnum, | |
4024 | Output_segment* tls_segment, | |
4025 | const elfcpp::Rela<size, false>& rela, | |
4026 | unsigned int, | |
4027 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4028 | unsigned char* view, | |
4029 | section_size_type view_size) | |
2e30d253 | 4030 | { |
41194d9f L |
4031 | // For SIZE == 64: |
4032 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
4033 | // .word 0x6666; rex64; call __tls_get_addr | |
4034 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
4035 | // For SIZE == 32: | |
4036 | // leaq foo@tlsgd(%rip),%rdi; | |
4037 | // .word 0x6666; rex64; call __tls_get_addr | |
4038 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 4039 | |
72ec2876 | 4040 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
72ec2876 | 4041 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
41194d9f L |
4042 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
4043 | ||
4044 | if (size == 64) | |
4045 | { | |
4046 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4047 | -4); | |
4048 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4049 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
4050 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", | |
4051 | 16); | |
4052 | } | |
4053 | else | |
4054 | { | |
4055 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
4056 | -3); | |
4057 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
4058 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
2e30d253 | 4059 | |
41194d9f L |
4060 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", |
4061 | 15); | |
4062 | } | |
2e30d253 | 4063 | |
6a41d30b | 4064 | value -= tls_segment->memsz(); |
fc51264f | 4065 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
4066 | |
4067 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4068 | // We can skip it. | |
4069 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
4070 | } |
4071 | ||
c2b45e22 CC |
4072 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
4073 | ||
fc51264f | 4074 | template<int size> |
c2b45e22 | 4075 | inline void |
fc51264f L |
4076 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
4077 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 | 4078 | size_t relnum, |
fc51264f | 4079 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 4080 | unsigned int r_type, |
fc51264f | 4081 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 4082 | unsigned char* view, |
fc51264f | 4083 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
4084 | section_size_type view_size) |
4085 | { | |
4086 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4087 | { | |
4088 | // leaq foo@tlsdesc(%rip), %rax | |
4089 | // ==> movq foo@gottpoff(%rip), %rax | |
4090 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4091 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4092 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4093 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
4094 | view[-2] = 0x8b; |
4095 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 4096 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
4097 | } |
4098 | else | |
4099 | { | |
4100 | // call *foo@tlscall(%rax) | |
4101 | // ==> nop; nop | |
4102 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
4103 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
4104 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4105 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
4106 | view[0] = 0x66; |
4107 | view[1] = 0x90; | |
4108 | } | |
4109 | } | |
4110 | ||
4111 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
4112 | ||
fc51264f | 4113 | template<int size> |
c2b45e22 | 4114 | inline void |
fc51264f L |
4115 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
4116 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
4117 | size_t relnum, |
4118 | Output_segment* tls_segment, | |
fc51264f | 4119 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 4120 | unsigned int r_type, |
fc51264f | 4121 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
4122 | unsigned char* view, |
4123 | section_size_type view_size) | |
4124 | { | |
4125 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4126 | { | |
4127 | // leaq foo@tlsdesc(%rip), %rax | |
4128 | // ==> movq foo@tpoff, %rax | |
4129 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4130 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4131 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4132 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
4133 | view[-2] = 0xc7; |
4134 | view[-1] = 0xc0; | |
4135 | value -= tls_segment->memsz(); | |
fc51264f | 4136 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
4137 | } |
4138 | else | |
4139 | { | |
4140 | // call *foo@tlscall(%rax) | |
4141 | // ==> nop; nop | |
4142 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
4143 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
4144 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4145 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
4146 | view[0] = 0x66; |
4147 | view[1] = 0x90; | |
4148 | } | |
4149 | } | |
4150 | ||
fc51264f | 4151 | template<int size> |
2e30d253 | 4152 | inline void |
fc51264f L |
4153 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
4154 | const Relocate_info<size, false>* relinfo, | |
4155 | size_t relnum, | |
4156 | Output_segment*, | |
4157 | const elfcpp::Rela<size, false>& rela, | |
4158 | unsigned int, | |
4159 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
4160 | unsigned char* view, | |
4161 | section_size_type view_size) | |
2e30d253 | 4162 | { |
72ec2876 | 4163 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
d2cf1c6c | 4164 | // For SIZE == 64: |
72ec2876 ILT |
4165 | // ... leq foo@dtpoff(%rax),%reg |
4166 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
d2cf1c6c L |
4167 | // For SIZE == 32: |
4168 | // ... leq foo@dtpoff(%rax),%reg | |
4169 | // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 4170 | |
72ec2876 ILT |
4171 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
4172 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 4173 | |
72ec2876 | 4174 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 4175 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); |
72ec2876 ILT |
4176 | |
4177 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
4178 | ||
d2cf1c6c L |
4179 | if (size == 64) |
4180 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
4181 | else | |
4182 | memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12); | |
72ec2876 ILT |
4183 | |
4184 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4185 | // We can skip it. | |
4186 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
4187 | } |
4188 | ||
56622147 ILT |
4189 | // Do a relocation in which we convert a TLS Initial-Exec to a |
4190 | // Local-Exec. | |
4191 | ||
fc51264f | 4192 | template<int size> |
56622147 | 4193 | inline void |
fc51264f L |
4194 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
4195 | const Relocate_info<size, false>* relinfo, | |
4196 | size_t relnum, | |
4197 | Output_segment* tls_segment, | |
4198 | const elfcpp::Rela<size, false>& rela, | |
4199 | unsigned int, | |
4200 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4201 | unsigned char* view, | |
4202 | section_size_type view_size) | |
56622147 ILT |
4203 | { |
4204 | // We need to examine the opcodes to figure out which instruction we | |
4205 | // are looking at. | |
4206 | ||
4207 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
4208 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
4209 | ||
4210 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4211 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4212 | ||
4213 | unsigned char op1 = view[-3]; | |
4214 | unsigned char op2 = view[-2]; | |
4215 | unsigned char op3 = view[-1]; | |
4216 | unsigned char reg = op3 >> 3; | |
4217 | ||
4218 | if (op2 == 0x8b) | |
4219 | { | |
4220 | // movq | |
4221 | if (op1 == 0x4c) | |
2e702c99 | 4222 | view[-3] = 0x49; |
e749cab8 L |
4223 | else if (size == 32 && op1 == 0x44) |
4224 | view[-3] = 0x41; | |
56622147 ILT |
4225 | view[-2] = 0xc7; |
4226 | view[-1] = 0xc0 | reg; | |
4227 | } | |
4228 | else if (reg == 4) | |
4229 | { | |
4230 | // Special handling for %rsp. | |
4231 | if (op1 == 0x4c) | |
2e702c99 | 4232 | view[-3] = 0x49; |
e749cab8 L |
4233 | else if (size == 32 && op1 == 0x44) |
4234 | view[-3] = 0x41; | |
56622147 ILT |
4235 | view[-2] = 0x81; |
4236 | view[-1] = 0xc0 | reg; | |
4237 | } | |
4238 | else | |
4239 | { | |
4240 | // addq | |
4241 | if (op1 == 0x4c) | |
2e702c99 | 4242 | view[-3] = 0x4d; |
e749cab8 L |
4243 | else if (size == 32 && op1 == 0x44) |
4244 | view[-3] = 0x45; | |
56622147 ILT |
4245 | view[-2] = 0x8d; |
4246 | view[-1] = 0x80 | reg | (reg << 3); | |
4247 | } | |
4248 | ||
65d92137 CC |
4249 | if (tls_segment != NULL) |
4250 | value -= tls_segment->memsz(); | |
fc51264f | 4251 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
4252 | } |
4253 | ||
2e30d253 ILT |
4254 | // Relocate section data. |
4255 | ||
fc51264f | 4256 | template<int size> |
2e30d253 | 4257 | void |
fc51264f L |
4258 | Target_x86_64<size>::relocate_section( |
4259 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
4260 | unsigned int sh_type, |
4261 | const unsigned char* prelocs, | |
4262 | size_t reloc_count, | |
4263 | Output_section* output_section, | |
4264 | bool needs_special_offset_handling, | |
4265 | unsigned char* view, | |
fc51264f | 4266 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
4267 | section_size_type view_size, |
4268 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 | 4269 | { |
4d625b70 CC |
4270 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
4271 | Classify_reloc; | |
4272 | ||
2e30d253 ILT |
4273 | gold_assert(sh_type == elfcpp::SHT_RELA); |
4274 | ||
4d625b70 CC |
4275 | gold::relocate_section<size, false, Target_x86_64<size>, Relocate, |
4276 | gold::Default_comdat_behavior, Classify_reloc>( | |
2e30d253 ILT |
4277 | relinfo, |
4278 | this, | |
4279 | prelocs, | |
4280 | reloc_count, | |
730cdc88 ILT |
4281 | output_section, |
4282 | needs_special_offset_handling, | |
2e30d253 ILT |
4283 | view, |
4284 | address, | |
364c7fa5 ILT |
4285 | view_size, |
4286 | reloc_symbol_changes); | |
2e30d253 ILT |
4287 | } |
4288 | ||
94a3fc8b CC |
4289 | // Apply an incremental relocation. Incremental relocations always refer |
4290 | // to global symbols. | |
4291 | ||
fc51264f | 4292 | template<int size> |
94a3fc8b | 4293 | void |
fc51264f L |
4294 | Target_x86_64<size>::apply_relocation( |
4295 | const Relocate_info<size, false>* relinfo, | |
4296 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 4297 | unsigned int r_type, |
fc51264f | 4298 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
4299 | const Symbol* gsym, |
4300 | unsigned char* view, | |
fc51264f | 4301 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
4302 | section_size_type view_size) |
4303 | { | |
fc51264f | 4304 | gold::apply_relocation<size, false, Target_x86_64<size>, |
618d6666 | 4305 | typename Target_x86_64<size>::Relocate>( |
94a3fc8b CC |
4306 | relinfo, |
4307 | this, | |
4308 | r_offset, | |
4309 | r_type, | |
4310 | r_addend, | |
4311 | gsym, | |
4312 | view, | |
4313 | address, | |
4314 | view_size); | |
4315 | } | |
4316 | ||
4d625b70 | 4317 | // Scan the relocs during a relocatable link. |
6a74a719 | 4318 | |
fc51264f | 4319 | template<int size> |
4d625b70 CC |
4320 | void |
4321 | Target_x86_64<size>::scan_relocatable_relocs( | |
4322 | Symbol_table* symtab, | |
4323 | Layout* layout, | |
4324 | Sized_relobj_file<size, false>* object, | |
4325 | unsigned int data_shndx, | |
4326 | unsigned int sh_type, | |
4327 | const unsigned char* prelocs, | |
4328 | size_t reloc_count, | |
4329 | Output_section* output_section, | |
4330 | bool needs_special_offset_handling, | |
4331 | size_t local_symbol_count, | |
4332 | const unsigned char* plocal_symbols, | |
4333 | Relocatable_relocs* rr) | |
6a74a719 | 4334 | { |
4d625b70 CC |
4335 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
4336 | Classify_reloc; | |
4337 | typedef gold::Default_scan_relocatable_relocs<Classify_reloc> | |
4338 | Scan_relocatable_relocs; | |
6a74a719 | 4339 | |
4d625b70 | 4340 | gold_assert(sh_type == elfcpp::SHT_RELA); |
6a74a719 | 4341 | |
4d625b70 CC |
4342 | gold::scan_relocatable_relocs<size, false, Scan_relocatable_relocs>( |
4343 | symtab, | |
4344 | layout, | |
4345 | object, | |
4346 | data_shndx, | |
4347 | prelocs, | |
4348 | reloc_count, | |
4349 | output_section, | |
4350 | needs_special_offset_handling, | |
4351 | local_symbol_count, | |
4352 | plocal_symbols, | |
4353 | rr); | |
6a74a719 ILT |
4354 | } |
4355 | ||
4d625b70 | 4356 | // Scan the relocs for --emit-relocs. |
6a74a719 | 4357 | |
fc51264f | 4358 | template<int size> |
6a74a719 | 4359 | void |
4d625b70 | 4360 | Target_x86_64<size>::emit_relocs_scan( |
fc51264f L |
4361 | Symbol_table* symtab, |
4362 | Layout* layout, | |
4363 | Sized_relobj_file<size, false>* object, | |
4364 | unsigned int data_shndx, | |
4365 | unsigned int sh_type, | |
4366 | const unsigned char* prelocs, | |
4367 | size_t reloc_count, | |
4368 | Output_section* output_section, | |
4369 | bool needs_special_offset_handling, | |
4370 | size_t local_symbol_count, | |
4d625b70 | 4371 | const unsigned char* plocal_syms, |
fc51264f | 4372 | Relocatable_relocs* rr) |
6a74a719 | 4373 | { |
4d625b70 CC |
4374 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
4375 | Classify_reloc; | |
4376 | typedef gold::Default_emit_relocs_strategy<Classify_reloc> | |
4377 | Emit_relocs_strategy; | |
6a74a719 | 4378 | |
4d625b70 | 4379 | gold_assert(sh_type == elfcpp::SHT_RELA); |
6a74a719 | 4380 | |
4d625b70 | 4381 | gold::scan_relocatable_relocs<size, false, Emit_relocs_strategy>( |
6a74a719 ILT |
4382 | symtab, |
4383 | layout, | |
4384 | object, | |
4385 | data_shndx, | |
4386 | prelocs, | |
4387 | reloc_count, | |
4388 | output_section, | |
4389 | needs_special_offset_handling, | |
4390 | local_symbol_count, | |
4d625b70 | 4391 | plocal_syms, |
6a74a719 ILT |
4392 | rr); |
4393 | } | |
4394 | ||
4395 | // Relocate a section during a relocatable link. | |
4396 | ||
fc51264f | 4397 | template<int size> |
6a74a719 | 4398 | void |
7404fe1b | 4399 | Target_x86_64<size>::relocate_relocs( |
fc51264f | 4400 | const Relocate_info<size, false>* relinfo, |
6a74a719 ILT |
4401 | unsigned int sh_type, |
4402 | const unsigned char* prelocs, | |
4403 | size_t reloc_count, | |
4404 | Output_section* output_section, | |
62fe925a | 4405 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
6a74a719 | 4406 | unsigned char* view, |
fc51264f | 4407 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
4408 | section_size_type view_size, |
4409 | unsigned char* reloc_view, | |
4410 | section_size_type reloc_view_size) | |
4411 | { | |
4d625b70 CC |
4412 | typedef gold::Default_classify_reloc<elfcpp::SHT_RELA, size, false> |
4413 | Classify_reloc; | |
4414 | ||
6a74a719 ILT |
4415 | gold_assert(sh_type == elfcpp::SHT_RELA); |
4416 | ||
4d625b70 | 4417 | gold::relocate_relocs<size, false, Classify_reloc>( |
6a74a719 ILT |
4418 | relinfo, |
4419 | prelocs, | |
4420 | reloc_count, | |
4421 | output_section, | |
4422 | offset_in_output_section, | |
6a74a719 ILT |
4423 | view, |
4424 | view_address, | |
4425 | view_size, | |
4426 | reloc_view, | |
4427 | reloc_view_size); | |
4428 | } | |
4429 | ||
4fb6c25d ILT |
4430 | // Return the value to use for a dynamic which requires special |
4431 | // treatment. This is how we support equality comparisons of function | |
4432 | // pointers across shared library boundaries, as described in the | |
4433 | // processor specific ABI supplement. | |
4434 | ||
fc51264f | 4435 | template<int size> |
4fb6c25d | 4436 | uint64_t |
fc51264f | 4437 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
4438 | { |
4439 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 4440 | return this->plt_address_for_global(gsym); |
4fb6c25d ILT |
4441 | } |
4442 | ||
2e30d253 ILT |
4443 | // Return a string used to fill a code section with nops to take up |
4444 | // the specified length. | |
4445 | ||
fc51264f | 4446 | template<int size> |
2e30d253 | 4447 | std::string |
fc51264f | 4448 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
4449 | { |
4450 | if (length >= 16) | |
4451 | { | |
4452 | // Build a jmpq instruction to skip over the bytes. | |
4453 | unsigned char jmp[5]; | |
4454 | jmp[0] = 0xe9; | |
04bf7072 | 4455 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 | 4456 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2e702c99 | 4457 | + std::string(length - 5, static_cast<char>(0x90))); |
2e30d253 ILT |
4458 | } |
4459 | ||
4460 | // Nop sequences of various lengths. | |
76677ad0 CC |
4461 | const char nop1[1] = { '\x90' }; // nop |
4462 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
4463 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
4464 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
2e702c99 | 4465 | '\x00'}; |
76677ad0 CC |
4466 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) |
4467 | '\x00', '\x00' }; | |
4468 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
2e702c99 | 4469 | '\x44', '\x00', '\x00' }; |
76677ad0 | 4470 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) |
2e702c99 | 4471 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4472 | '\x00' }; |
4473 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
2e702c99 | 4474 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4475 | '\x00', '\x00' }; |
4476 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
2e702c99 | 4477 | '\x84', '\x00', '\x00', |
76677ad0 CC |
4478 | '\x00', '\x00', '\x00' }; |
4479 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
2e702c99 | 4480 | '\x1f', '\x84', '\x00', |
76677ad0 CC |
4481 | '\x00', '\x00', '\x00', |
4482 | '\x00' }; | |
4483 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
2e702c99 | 4484 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4485 | '\x00', '\x00', '\x00', |
4486 | '\x00', '\x00' }; | |
4487 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
2e702c99 | 4488 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4489 | '\x84', '\x00', '\x00', |
4490 | '\x00', '\x00', '\x00' }; | |
4491 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
2e702c99 | 4492 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4493 | '\x1f', '\x84', '\x00', |
4494 | '\x00', '\x00', '\x00', | |
2e702c99 | 4495 | '\x00' }; |
76677ad0 | 4496 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4497 | '\x66', '\x66', '\x2e', // data16 |
76677ad0 CC |
4498 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
4499 | '\x00', '\x00', '\x00', | |
2e702c99 | 4500 | '\x00', '\x00' }; |
76677ad0 | 4501 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4502 | '\x66', '\x66', '\x66', // data16; data16 |
76677ad0 CC |
4503 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
4504 | '\x84', '\x00', '\x00', | |
2e702c99 | 4505 | '\x00', '\x00', '\x00' }; |
2e30d253 ILT |
4506 | |
4507 | const char* nops[16] = { | |
4508 | NULL, | |
4509 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
4510 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
4511 | }; | |
4512 | ||
4513 | return std::string(nops[length], length); | |
4514 | } | |
4515 | ||
e291e7b9 ILT |
4516 | // Return the addend to use for a target specific relocation. The |
4517 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
4518 | // symbol. We want to set the addend is the offset of the local | |
4519 | // symbol in the TLS segment. | |
4520 | ||
fc51264f | 4521 | template<int size> |
e291e7b9 | 4522 | uint64_t |
fc51264f L |
4523 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
4524 | uint64_t) const | |
e291e7b9 ILT |
4525 | { |
4526 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
4527 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
4528 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
4529 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 4530 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
4531 | gold_assert(psymval->is_tls_symbol()); |
4532 | // The value of a TLS symbol is the offset in the TLS segment. | |
4533 | return psymval->value(ti.object, 0); | |
4534 | } | |
4535 | ||
02d7cd44 ILT |
4536 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
4537 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
4538 | // assembler can not write out the difference between two labels in | |
4539 | // different sections, so instead of using a pc-relative value they | |
4540 | // use an offset from the GOT. | |
4541 | ||
fc51264f | 4542 | template<int size> |
02d7cd44 | 4543 | uint64_t |
fc51264f | 4544 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
4545 | { |
4546 | gold_assert(this->global_offset_table_ != NULL); | |
4547 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 4548 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
4549 | return ssym->value(); |
4550 | } | |
4551 | ||
364c7fa5 | 4552 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 4553 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
4554 | // code. We have to change the function so that it always ensures |
4555 | // that it has enough stack space to run some random function. | |
4556 | ||
4fc1b9d4 L |
4557 | static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 }; |
4558 | static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 }; | |
4559 | static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 }; | |
4560 | ||
4561 | static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 }; | |
4562 | static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 }; | |
4563 | static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 }; | |
4564 | ||
fc51264f | 4565 | template<int size> |
364c7fa5 | 4566 | void |
fc51264f L |
4567 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
4568 | section_offset_type fnoffset, | |
4569 | section_size_type fnsize, | |
6e0813d3 CC |
4570 | const unsigned char*, |
4571 | size_t, | |
fc51264f L |
4572 | unsigned char* view, |
4573 | section_size_type view_size, | |
4574 | std::string* from, | |
4575 | std::string* to) const | |
364c7fa5 | 4576 | { |
4fc1b9d4 L |
4577 | const char* const cmp_insn = reinterpret_cast<const char*> |
4578 | (size == 32 ? cmp_insn_32 : cmp_insn_64); | |
4579 | const char* const lea_r10_insn = reinterpret_cast<const char*> | |
4580 | (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64); | |
4581 | const char* const lea_r11_insn = reinterpret_cast<const char*> | |
4582 | (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64); | |
4583 | ||
4584 | const size_t cmp_insn_len = | |
4585 | (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64)); | |
4586 | const size_t lea_r10_insn_len = | |
4587 | (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64)); | |
4588 | const size_t lea_r11_insn_len = | |
4589 | (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64)); | |
4590 | const size_t nop_len = (size == 32 ? 7 : 8); | |
4591 | ||
364c7fa5 ILT |
4592 | // The function starts with a comparison of the stack pointer and a |
4593 | // field in the TCB. This is followed by a jump. | |
4594 | ||
4595 | // cmp %fs:NN,%rsp | |
4fc1b9d4 L |
4596 | if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len) |
4597 | && fnsize > nop_len + 1) | |
364c7fa5 ILT |
4598 | { |
4599 | // We will call __morestack if the carry flag is set after this | |
4600 | // comparison. We turn the comparison into an stc instruction | |
4601 | // and some nops. | |
4602 | view[fnoffset] = '\xf9'; | |
4fc1b9d4 | 4603 | this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len); |
364c7fa5 ILT |
4604 | } |
4605 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
4606 | // lea NN(%rsp),%r11 |
4607 | else if ((this->match_view(view, view_size, fnoffset, | |
4fc1b9d4 | 4608 | lea_r10_insn, lea_r10_insn_len) |
cbc999b9 | 4609 | || this->match_view(view, view_size, fnoffset, |
4fc1b9d4 | 4610 | lea_r11_insn, lea_r11_insn_len)) |
364c7fa5 ILT |
4611 | && fnsize > 8) |
4612 | { | |
4613 | // This is loading an offset from the stack pointer for a | |
4614 | // comparison. The offset is negative, so we decrease the | |
4615 | // offset by the amount of space we need for the stack. This | |
4616 | // means we will avoid calling __morestack if there happens to | |
4617 | // be plenty of space on the stack already. | |
4618 | unsigned char* pval = view + fnoffset + 4; | |
4619 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
4620 | val -= parameters->options().split_stack_adjust_size(); | |
4621 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
4622 | } | |
4623 | else | |
4624 | { | |
4625 | if (!object->has_no_split_stack()) | |
4626 | object->error(_("failed to match split-stack sequence at " | |
4627 | "section %u offset %0zx"), | |
ac33a407 | 4628 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
4629 | return; |
4630 | } | |
4631 | ||
4632 | // We have to change the function so that it calls | |
4633 | // __morestack_non_split instead of __morestack. The former will | |
4634 | // allocate additional stack space. | |
4635 | *from = "__morestack"; | |
4636 | *to = "__morestack_non_split"; | |
4637 | } | |
4638 | ||
2e702c99 RM |
4639 | // The selector for x86_64 object files. Note this is never instantiated |
4640 | // directly. It's only used in Target_selector_x86_64_nacl, below. | |
2e30d253 | 4641 | |
fc51264f | 4642 | template<int size> |
36959681 | 4643 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
4644 | { |
4645 | public: | |
4646 | Target_selector_x86_64() | |
fc51264f | 4647 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
2e702c99 | 4648 | (size == 64 |
fc51264f | 4649 | ? "elf64-x86-64" : "elf32-x86-64"), |
2e702c99 | 4650 | (size == 64 |
fc51264f L |
4651 | ? "elf64-x86-64-freebsd" |
4652 | : "elf32-x86-64-freebsd"), | |
4653 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
4654 | { } |
4655 | ||
4656 | Target* | |
e96caa79 | 4657 | do_instantiate_target() |
fc51264f | 4658 | { return new Target_x86_64<size>(); } |
36959681 | 4659 | |
2e30d253 ILT |
4660 | }; |
4661 | ||
2e702c99 RM |
4662 | // NaCl variant. It uses different PLT contents. |
4663 | ||
4664 | template<int size> | |
4665 | class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size> | |
4666 | { | |
4667 | public: | |
4668 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4669 | Output_data_got<64, false>* got, | |
57b2284c | 4670 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4671 | Output_data_space* got_irelative) |
4672 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4673 | got, got_plt, got_irelative) | |
4674 | { } | |
4675 | ||
4676 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4677 | Output_data_got<64, false>* got, | |
57b2284c | 4678 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4679 | Output_data_space* got_irelative, |
4680 | unsigned int plt_count) | |
4681 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4682 | got, got_plt, got_irelative, | |
4683 | plt_count) | |
4684 | { } | |
4685 | ||
4686 | protected: | |
4687 | virtual unsigned int | |
4688 | do_get_plt_entry_size() const | |
4689 | { return plt_entry_size; } | |
4690 | ||
4691 | virtual void | |
4692 | do_add_eh_frame(Layout* layout) | |
4693 | { | |
4694 | layout->add_eh_frame_for_plt(this, | |
4695 | this->plt_eh_frame_cie, | |
4696 | this->plt_eh_frame_cie_size, | |
4697 | plt_eh_frame_fde, | |
4698 | plt_eh_frame_fde_size); | |
4699 | } | |
4700 | ||
4701 | virtual void | |
4702 | do_fill_first_plt_entry(unsigned char* pov, | |
4703 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
4704 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
4705 | ||
4706 | virtual unsigned int | |
4707 | do_fill_plt_entry(unsigned char* pov, | |
4708 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4709 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4710 | unsigned int got_offset, | |
4711 | unsigned int plt_offset, | |
4712 | unsigned int plt_index); | |
4713 | ||
4714 | virtual void | |
4715 | do_fill_tlsdesc_entry(unsigned char* pov, | |
4716 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4717 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4718 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4719 | unsigned int tlsdesc_got_offset, | |
4720 | unsigned int plt_offset); | |
4721 | ||
4722 | private: | |
4723 | // The size of an entry in the PLT. | |
4724 | static const int plt_entry_size = 64; | |
4725 | ||
4726 | // The first entry in the PLT. | |
4727 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4728 | ||
4729 | // Other entries in the PLT for an executable. | |
4730 | static const unsigned char plt_entry[plt_entry_size]; | |
4731 | ||
4732 | // The reserved TLSDESC entry in the PLT for an executable. | |
4733 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
4734 | ||
4735 | // The .eh_frame unwind information for the PLT. | |
4736 | static const int plt_eh_frame_fde_size = 32; | |
4737 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
4738 | }; | |
4739 | ||
4740 | template<int size> | |
4741 | class Target_x86_64_nacl : public Target_x86_64<size> | |
4742 | { | |
4743 | public: | |
4744 | Target_x86_64_nacl() | |
4745 | : Target_x86_64<size>(&x86_64_nacl_info) | |
4746 | { } | |
4747 | ||
4748 | virtual Output_data_plt_x86_64<size>* | |
4749 | do_make_data_plt(Layout* layout, | |
4750 | Output_data_got<64, false>* got, | |
57b2284c | 4751 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4752 | Output_data_space* got_irelative) |
4753 | { | |
4754 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4755 | got_irelative); | |
4756 | } | |
4757 | ||
4758 | virtual Output_data_plt_x86_64<size>* | |
4759 | do_make_data_plt(Layout* layout, | |
4760 | Output_data_got<64, false>* got, | |
57b2284c | 4761 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4762 | Output_data_space* got_irelative, |
4763 | unsigned int plt_count) | |
4764 | { | |
4765 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4766 | got_irelative, | |
4767 | plt_count); | |
4768 | } | |
4769 | ||
93f8221c RM |
4770 | virtual std::string |
4771 | do_code_fill(section_size_type length) const; | |
4772 | ||
2e702c99 RM |
4773 | private: |
4774 | static const Target::Target_info x86_64_nacl_info; | |
4775 | }; | |
4776 | ||
4777 | template<> | |
4778 | const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info = | |
4779 | { | |
4780 | 64, // size | |
4781 | false, // is_big_endian | |
4782 | elfcpp::EM_X86_64, // machine_code | |
4783 | false, // has_make_symbol | |
4784 | false, // has_resolve | |
4785 | true, // has_code_fill | |
4786 | true, // is_default_stack_executable | |
4787 | true, // can_icf_inline_merge_sections | |
4788 | '\0', // wrap_char | |
4789 | "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker | |
4790 | 0x20000, // default_text_segment_address | |
4791 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4792 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4793 | true, // isolate_execinstr | |
4794 | 0x10000000, // rosegment_gap | |
4795 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4796 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4797 | 0, // small_common_section_flags | |
4798 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4799 | NULL, // attributes_section | |
a67858e0 | 4800 | NULL, // attributes_vendor |
8d9743bd MK |
4801 | "_start", // entry_symbol_name |
4802 | 32, // hash_entry_size | |
2e702c99 RM |
4803 | }; |
4804 | ||
4805 | template<> | |
4806 | const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info = | |
4807 | { | |
4808 | 32, // size | |
4809 | false, // is_big_endian | |
4810 | elfcpp::EM_X86_64, // machine_code | |
4811 | false, // has_make_symbol | |
4812 | false, // has_resolve | |
4813 | true, // has_code_fill | |
4814 | true, // is_default_stack_executable | |
4815 | true, // can_icf_inline_merge_sections | |
4816 | '\0', // wrap_char | |
4817 | "/lib/ld-nacl-x86-64.so.1", // dynamic_linker | |
4818 | 0x20000, // default_text_segment_address | |
4819 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4820 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4821 | true, // isolate_execinstr | |
4822 | 0x10000000, // rosegment_gap | |
4823 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4824 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4825 | 0, // small_common_section_flags | |
4826 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4827 | NULL, // attributes_section | |
a67858e0 | 4828 | NULL, // attributes_vendor |
8d9743bd MK |
4829 | "_start", // entry_symbol_name |
4830 | 32, // hash_entry_size | |
2e702c99 RM |
4831 | }; |
4832 | ||
4833 | #define NACLMASK 0xe0 // 32-byte alignment mask. | |
4834 | ||
4835 | // The first entry in the PLT. | |
4836 | ||
4837 | template<int size> | |
4838 | const unsigned char | |
4839 | Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] = | |
4840 | { | |
4841 | 0xff, 0x35, // pushq contents of memory address | |
4842 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4843 | 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11 | |
4844 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
4845 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4846 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4847 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4848 | ||
4849 | // 9-byte nop sequence to pad out to the next 32-byte boundary. | |
dd0845d7 | 4850 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1) |
2e702c99 RM |
4851 | |
4852 | // 32 bytes of nop to pad out to the standard size | |
4853 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4854 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4855 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4856 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4857 | 0x66, // excess data32 prefix | |
4858 | 0x90 // nop | |
4859 | }; | |
4860 | ||
4861 | template<int size> | |
4862 | void | |
4863 | Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry( | |
4864 | unsigned char* pov, | |
4865 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4866 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
4867 | { | |
4868 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4869 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4870 | (got_address + 8 | |
4871 | - (plt_address + 2 + 4))); | |
4872 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4873 | (got_address + 16 | |
4874 | - (plt_address + 9 + 4))); | |
4875 | } | |
4876 | ||
4877 | // Subsequent entries in the PLT. | |
4878 | ||
4879 | template<int size> | |
4880 | const unsigned char | |
4881 | Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] = | |
4882 | { | |
4883 | 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11 | |
4884 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4885 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4886 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4887 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4888 | ||
4889 | // 15-byte nop sequence to pad out to the next 32-byte boundary. | |
4890 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4891 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4892 | ||
4893 | // Lazy GOT entries point here (32-byte aligned). | |
4894 | 0x68, // pushq immediate | |
4895 | 0, 0, 0, 0, // replaced with index into relocation table | |
4896 | 0xe9, // jmp relative | |
4897 | 0, 0, 0, 0, // replaced with offset to start of .plt0 | |
4898 | ||
4899 | // 22 bytes of nop to pad out to the standard size. | |
4900 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4901 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4902 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax) | |
4903 | }; | |
4904 | ||
4905 | template<int size> | |
4906 | unsigned int | |
4907 | Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry( | |
4908 | unsigned char* pov, | |
4909 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4910 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4911 | unsigned int got_offset, | |
4912 | unsigned int plt_offset, | |
4913 | unsigned int plt_index) | |
4914 | { | |
4915 | memcpy(pov, plt_entry, plt_entry_size); | |
4916 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, | |
4917 | (got_address + got_offset | |
4918 | - (plt_address + plt_offset | |
4919 | + 3 + 4))); | |
4920 | ||
4921 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index); | |
4922 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 38, | |
4923 | - (plt_offset + 38 + 4)); | |
4924 | ||
4925 | return 32; | |
4926 | } | |
4927 | ||
4928 | // The reserved TLSDESC entry in the PLT. | |
4929 | ||
4930 | template<int size> | |
4931 | const unsigned char | |
4932 | Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] = | |
4933 | { | |
4934 | 0xff, 0x35, // pushq x(%rip) | |
4935 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
4936 | 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11 | |
4937 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
4938 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4939 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4940 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4941 | ||
4942 | // 41 bytes of nop to pad out to the standard size. | |
4943 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4944 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4945 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4946 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4947 | 0x66, 0x66, // excess data32 prefixes | |
4948 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4949 | }; | |
4950 | ||
4951 | template<int size> | |
4952 | void | |
4953 | Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry( | |
4954 | unsigned char* pov, | |
4955 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4956 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4957 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4958 | unsigned int tlsdesc_got_offset, | |
4959 | unsigned int plt_offset) | |
4960 | { | |
4961 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
4962 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4963 | (got_address + 8 | |
4964 | - (plt_address + plt_offset | |
4965 | + 2 + 4))); | |
4966 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4967 | (got_base | |
4968 | + tlsdesc_got_offset | |
4969 | - (plt_address + plt_offset | |
4970 | + 9 + 4))); | |
4971 | } | |
4972 | ||
4973 | // The .eh_frame unwind information for the PLT. | |
4974 | ||
4975 | template<int size> | |
4976 | const unsigned char | |
4977 | Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4978 | { | |
4979 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4980 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4981 | 0, // Augmentation size. | |
4982 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
4983 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4984 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
4985 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4986 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4987 | 13, // Block length. | |
4988 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
4989 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
4990 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4991 | elfcpp::DW_OP_and, // & (%rip & 0x3f). | |
4992 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4993 | elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25) | |
4994 | elfcpp::DW_OP_lit3, // Push 3. | |
4995 | elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3) | |
4996 | elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8 | |
4997 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4998 | elfcpp::DW_CFA_nop | |
4999 | }; | |
5000 | ||
93f8221c RM |
5001 | // Return a string used to fill a code section with nops. |
5002 | // For NaCl, long NOPs are only valid if they do not cross | |
5003 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
5004 | template<int size> | |
5005 | std::string | |
5006 | Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const | |
5007 | { | |
5008 | return std::string(length, static_cast<char>(0x90)); | |
5009 | } | |
5010 | ||
2e702c99 RM |
5011 | // The selector for x86_64-nacl object files. |
5012 | ||
5013 | template<int size> | |
5014 | class Target_selector_x86_64_nacl | |
5015 | : public Target_selector_nacl<Target_selector_x86_64<size>, | |
5016 | Target_x86_64_nacl<size> > | |
5017 | { | |
5018 | public: | |
5019 | Target_selector_x86_64_nacl() | |
5020 | : Target_selector_nacl<Target_selector_x86_64<size>, | |
5021 | Target_x86_64_nacl<size> >("x86-64", | |
5022 | size == 64 | |
5023 | ? "elf64-x86-64-nacl" | |
5024 | : "elf32-x86-64-nacl", | |
5025 | size == 64 | |
5026 | ? "elf_x86_64_nacl" | |
5027 | : "elf32_x86_64_nacl") | |
5028 | { } | |
5029 | }; | |
5030 | ||
5031 | Target_selector_x86_64_nacl<64> target_selector_x86_64; | |
5032 | Target_selector_x86_64_nacl<32> target_selector_x32; | |
2e30d253 ILT |
5033 | |
5034 | } // End anonymous namespace. |