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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
b90efa5b | 3 | // Copyright (C) 2006-2015 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 | ||
7404fe1b | 499 | // Emit relocations for a section. |
6a74a719 | 500 | void |
7404fe1b | 501 | relocate_relocs( |
fc51264f L |
502 | const Relocate_info<size, false>*, |
503 | unsigned int sh_type, | |
504 | const unsigned char* prelocs, | |
505 | size_t reloc_count, | |
506 | Output_section* output_section, | |
62fe925a | 507 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
fc51264f L |
508 | const Relocatable_relocs*, |
509 | unsigned char* view, | |
510 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
511 | section_size_type view_size, | |
512 | unsigned char* reloc_view, | |
513 | section_size_type reloc_view_size); | |
6a74a719 | 514 | |
2e30d253 ILT |
515 | // Return a string used to fill a code section with nops. |
516 | std::string | |
8851ecca | 517 | do_code_fill(section_size_type length) const; |
2e30d253 | 518 | |
9a2d6984 ILT |
519 | // Return whether SYM is defined by the ABI. |
520 | bool | |
9c2d0ef9 | 521 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
522 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
523 | ||
e291e7b9 ILT |
524 | // Return the symbol index to use for a target specific relocation. |
525 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
526 | // local symbol, which is an absolute reloc. | |
527 | unsigned int | |
528 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
529 | { | |
530 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
531 | return 0; | |
532 | } | |
533 | ||
534 | // Return the addend to use for a target specific relocation. | |
535 | uint64_t | |
536 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
537 | ||
7223e9ca | 538 | // Return the PLT section. |
67181c72 ILT |
539 | uint64_t |
540 | do_plt_address_for_global(const Symbol* gsym) const | |
541 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 542 | |
67181c72 ILT |
543 | uint64_t |
544 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
545 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 546 | |
b3ce541e ILT |
547 | // This function should be defined in targets that can use relocation |
548 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
549 | // and global_reloc_may_be_function_pointer) | |
550 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
551 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
552 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
553 | bool | |
554 | do_can_check_for_function_pointers() const | |
555 | { return !parameters->options().pie(); } | |
556 | ||
02d7cd44 ILT |
557 | // Return the base for a DW_EH_PE_datarel encoding. |
558 | uint64_t | |
559 | do_ehframe_datarel_base() const; | |
560 | ||
9b547ce6 | 561 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
562 | void |
563 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
564 | section_offset_type fnoffset, section_size_type fnsize, | |
565 | unsigned char* view, section_size_type view_size, | |
566 | std::string* from, std::string* to) const; | |
567 | ||
96f2030e | 568 | // Return the size of the GOT section. |
fe8718a4 | 569 | section_size_type |
0e70b911 | 570 | got_size() const |
96f2030e ILT |
571 | { |
572 | gold_assert(this->got_ != NULL); | |
573 | return this->got_->data_size(); | |
574 | } | |
575 | ||
0e70b911 CC |
576 | // Return the number of entries in the GOT. |
577 | unsigned int | |
578 | got_entry_count() const | |
579 | { | |
580 | if (this->got_ == NULL) | |
581 | return 0; | |
582 | return this->got_size() / 8; | |
583 | } | |
584 | ||
585 | // Return the number of entries in the PLT. | |
586 | unsigned int | |
587 | plt_entry_count() const; | |
588 | ||
589 | // Return the offset of the first non-reserved PLT entry. | |
590 | unsigned int | |
591 | first_plt_entry_offset() const; | |
592 | ||
593 | // Return the size of each PLT entry. | |
594 | unsigned int | |
595 | plt_entry_size() const; | |
596 | ||
4829d394 | 597 | // Create the GOT section for an incremental update. |
dd74ae06 | 598 | Output_data_got_base* |
4829d394 CC |
599 | init_got_plt_for_update(Symbol_table* symtab, |
600 | Layout* layout, | |
601 | unsigned int got_count, | |
602 | unsigned int plt_count); | |
603 | ||
6fa2a40b CC |
604 | // Reserve a GOT entry for a local symbol, and regenerate any |
605 | // necessary dynamic relocations. | |
606 | void | |
607 | reserve_local_got_entry(unsigned int got_index, | |
2e702c99 | 608 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
609 | unsigned int r_sym, |
610 | unsigned int got_type); | |
611 | ||
612 | // Reserve a GOT entry for a global symbol, and regenerate any | |
613 | // necessary dynamic relocations. | |
614 | void | |
615 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
616 | unsigned int got_type); | |
617 | ||
4829d394 | 618 | // Register an existing PLT entry for a global symbol. |
4829d394 | 619 | void |
67181c72 ILT |
620 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
621 | Symbol* gsym); | |
4829d394 | 622 | |
26d3c67d CC |
623 | // Force a COPY relocation for a given symbol. |
624 | void | |
625 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
626 | ||
94a3fc8b CC |
627 | // Apply an incremental relocation. |
628 | void | |
fc51264f L |
629 | apply_relocation(const Relocate_info<size, false>* relinfo, |
630 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 631 | unsigned int r_type, |
fc51264f | 632 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
633 | const Symbol* gsym, |
634 | unsigned char* view, | |
fc51264f | 635 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
636 | section_size_type view_size); |
637 | ||
e291e7b9 ILT |
638 | // Add a new reloc argument, returning the index in the vector. |
639 | size_t | |
fc51264f | 640 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
641 | { |
642 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
643 | return this->tlsdesc_reloc_info_.size() - 1; | |
644 | } | |
645 | ||
2e702c99 RM |
646 | Output_data_plt_x86_64<size>* |
647 | make_data_plt(Layout* layout, | |
648 | Output_data_got<64, false>* got, | |
57b2284c | 649 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
650 | Output_data_space* got_irelative) |
651 | { | |
652 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); | |
653 | } | |
654 | ||
655 | Output_data_plt_x86_64<size>* | |
656 | make_data_plt(Layout* layout, | |
657 | Output_data_got<64, false>* got, | |
57b2284c | 658 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
659 | Output_data_space* got_irelative, |
660 | unsigned int plt_count) | |
661 | { | |
662 | return this->do_make_data_plt(layout, got, got_plt, got_irelative, | |
663 | plt_count); | |
664 | } | |
665 | ||
666 | virtual Output_data_plt_x86_64<size>* | |
667 | do_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 new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
673 | got_irelative); | |
674 | } | |
675 | ||
676 | virtual Output_data_plt_x86_64<size>* | |
677 | do_make_data_plt(Layout* layout, | |
678 | Output_data_got<64, false>* got, | |
57b2284c | 679 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
680 | Output_data_space* got_irelative, |
681 | unsigned int plt_count) | |
682 | { | |
683 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
684 | got_irelative, | |
685 | plt_count); | |
686 | } | |
687 | ||
2e30d253 ILT |
688 | private: |
689 | // The class which scans relocations. | |
a036edd8 | 690 | class Scan |
2e30d253 | 691 | { |
a036edd8 ILT |
692 | public: |
693 | Scan() | |
694 | : issued_non_pic_error_(false) | |
695 | { } | |
696 | ||
95a2c8d6 RS |
697 | static inline int |
698 | get_reference_flags(unsigned int r_type); | |
699 | ||
2e30d253 | 700 | inline void |
ad0f2072 | 701 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 702 | Sized_relobj_file<size, false>* object, |
2e30d253 | 703 | unsigned int data_shndx, |
07f397ab | 704 | Output_section* output_section, |
fc51264f | 705 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
706 | const elfcpp::Sym<size, false>& lsym, |
707 | bool is_discarded); | |
2e30d253 ILT |
708 | |
709 | inline void | |
ad0f2072 | 710 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 711 | Sized_relobj_file<size, false>* object, |
2e30d253 | 712 | unsigned int data_shndx, |
07f397ab | 713 | Output_section* output_section, |
fc51264f | 714 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
2e30d253 | 715 | Symbol* gsym); |
e041f13d | 716 | |
21bb3914 ST |
717 | inline bool |
718 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
719 | Target_x86_64* target, | |
2e702c99 RM |
720 | Sized_relobj_file<size, false>* object, |
721 | unsigned int data_shndx, | |
722 | Output_section* output_section, | |
723 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 724 | unsigned int r_type, |
2e702c99 | 725 | const elfcpp::Sym<size, false>& lsym); |
21bb3914 ST |
726 | |
727 | inline bool | |
728 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
2e702c99 RM |
729 | Target_x86_64* target, |
730 | Sized_relobj_file<size, false>* object, | |
731 | unsigned int data_shndx, | |
732 | Output_section* output_section, | |
733 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 734 | unsigned int r_type, |
2e702c99 | 735 | Symbol* gsym); |
21bb3914 | 736 | |
a036edd8 | 737 | private: |
e041f13d | 738 | static void |
fc51264f L |
739 | unsupported_reloc_local(Sized_relobj_file<size, false>*, |
740 | unsigned int r_type); | |
e041f13d ILT |
741 | |
742 | static void | |
fc51264f L |
743 | unsupported_reloc_global(Sized_relobj_file<size, false>*, |
744 | unsigned int r_type, Symbol*); | |
a036edd8 ILT |
745 | |
746 | void | |
a29b0dad | 747 | check_non_pic(Relobj*, unsigned int r_type, Symbol*); |
a036edd8 | 748 | |
21bb3914 ST |
749 | inline bool |
750 | possible_function_pointer_reloc(unsigned int r_type); | |
751 | ||
7223e9ca | 752 | bool |
fc51264f | 753 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*, |
6fa2a40b | 754 | unsigned int r_type); |
7223e9ca | 755 | |
a036edd8 ILT |
756 | // Whether we have issued an error about a non-PIC compilation. |
757 | bool issued_non_pic_error_; | |
2e30d253 ILT |
758 | }; |
759 | ||
760 | // The class which implements relocation. | |
761 | class Relocate | |
762 | { | |
763 | public: | |
764 | Relocate() | |
36171d64 | 765 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
766 | { } |
767 | ||
768 | ~Relocate() | |
769 | { | |
770 | if (this->skip_call_tls_get_addr_) | |
771 | { | |
772 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 773 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
774 | } |
775 | } | |
776 | ||
777 | // Do a relocation. Return false if the caller should not issue | |
778 | // any warnings about this relocation. | |
779 | inline bool | |
fc51264f L |
780 | relocate(const Relocate_info<size, false>*, Target_x86_64*, |
781 | Output_section*, | |
782 | size_t relnum, const elfcpp::Rela<size, false>&, | |
783 | unsigned int r_type, const Sized_symbol<size>*, | |
784 | const Symbol_value<size>*, | |
785 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 786 | section_size_type); |
2e30d253 ILT |
787 | |
788 | private: | |
789 | // Do a TLS relocation. | |
790 | inline void | |
fc51264f | 791 | relocate_tls(const Relocate_info<size, false>*, Target_x86_64*, |
2e702c99 | 792 | size_t relnum, const elfcpp::Rela<size, false>&, |
fc51264f L |
793 | unsigned int r_type, const Sized_symbol<size>*, |
794 | const Symbol_value<size>*, | |
795 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 796 | section_size_type); |
2e30d253 | 797 | |
c2b45e22 | 798 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 | 799 | inline void |
fc51264f | 800 | tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
7bf1f802 | 801 | Output_segment* tls_segment, |
fc51264f L |
802 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
803 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
7bf1f802 | 804 | unsigned char* view, |
fc51264f | 805 | typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 806 | section_size_type view_size); |
7bf1f802 | 807 | |
56622147 ILT |
808 | // Do a TLS General-Dynamic to Local-Exec transition. |
809 | inline void | |
fc51264f | 810 | tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 811 | Output_segment* tls_segment, |
fc51264f L |
812 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
813 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 814 | unsigned char* view, |
fe8718a4 | 815 | section_size_type view_size); |
2e30d253 | 816 | |
c2b45e22 CC |
817 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
818 | inline void | |
fc51264f | 819 | tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 820 | Output_segment* tls_segment, |
fc51264f L |
821 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
822 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 | 823 | unsigned char* view, |
fc51264f | 824 | typename elfcpp::Elf_types<size>::Elf_Addr, |
c2b45e22 CC |
825 | section_size_type view_size); |
826 | ||
827 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
828 | inline void | |
fc51264f | 829 | tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 830 | Output_segment* tls_segment, |
fc51264f L |
831 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
832 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 CC |
833 | unsigned char* view, |
834 | section_size_type view_size); | |
835 | ||
56622147 | 836 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 837 | inline void |
fc51264f | 838 | tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 839 | Output_segment* tls_segment, |
fc51264f L |
840 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
841 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 842 | unsigned char* view, |
fe8718a4 | 843 | section_size_type view_size); |
2e30d253 | 844 | |
56622147 ILT |
845 | // Do a TLS Initial-Exec to Local-Exec transition. |
846 | static inline void | |
fc51264f | 847 | tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum, |
72ec2876 | 848 | Output_segment* tls_segment, |
fc51264f L |
849 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
850 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
72ec2876 | 851 | unsigned char* view, |
fe8718a4 | 852 | section_size_type view_size); |
2e30d253 ILT |
853 | |
854 | // This is set if we should skip the next reloc, which should be a | |
855 | // PLT32 reloc against ___tls_get_addr. | |
856 | bool skip_call_tls_get_addr_; | |
857 | }; | |
858 | ||
6a74a719 ILT |
859 | // A class which returns the size required for a relocation type, |
860 | // used while scanning relocs during a relocatable link. | |
861 | class Relocatable_size_for_reloc | |
862 | { | |
863 | public: | |
864 | unsigned int | |
865 | get_size_for_reloc(unsigned int, Relobj*); | |
866 | }; | |
867 | ||
2e30d253 ILT |
868 | // Adjust TLS relocation type based on the options and whether this |
869 | // is a local symbol. | |
e041f13d | 870 | static tls::Tls_optimization |
2e30d253 ILT |
871 | optimize_tls_reloc(bool is_final, int r_type); |
872 | ||
873 | // Get the GOT section, creating it if necessary. | |
874 | Output_data_got<64, false>* | |
875 | got_section(Symbol_table*, Layout*); | |
876 | ||
96f2030e | 877 | // Get the GOT PLT section. |
57b2284c | 878 | Output_data_got_plt_x86_64* |
96f2030e ILT |
879 | got_plt_section() const |
880 | { | |
881 | gold_assert(this->got_plt_ != NULL); | |
882 | return this->got_plt_; | |
883 | } | |
884 | ||
a8df5856 ILT |
885 | // Get the GOT section for TLSDESC entries. |
886 | Output_data_got<64, false>* | |
887 | got_tlsdesc_section() const | |
888 | { | |
889 | gold_assert(this->got_tlsdesc_ != NULL); | |
890 | return this->got_tlsdesc_; | |
891 | } | |
892 | ||
c2b45e22 CC |
893 | // Create the PLT section. |
894 | void | |
895 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
896 | ||
2e30d253 ILT |
897 | // Create a PLT entry for a global symbol. |
898 | void | |
899 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
900 | ||
7223e9ca ILT |
901 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
902 | void | |
903 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
fc51264f | 904 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
905 | unsigned int local_sym_index); |
906 | ||
9fa33bee | 907 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
908 | void |
909 | define_tls_base_symbol(Symbol_table*, Layout*); | |
910 | ||
c2b45e22 CC |
911 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
912 | void | |
913 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
914 | ||
31d60480 ILT |
915 | // Create a GOT entry for the TLS module index. |
916 | unsigned int | |
917 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
fc51264f | 918 | Sized_relobj_file<size, false>* object); |
31d60480 | 919 | |
2e30d253 | 920 | // Get the PLT section. |
fc51264f | 921 | Output_data_plt_x86_64<size>* |
2e30d253 ILT |
922 | plt_section() const |
923 | { | |
924 | gold_assert(this->plt_ != NULL); | |
925 | return this->plt_; | |
926 | } | |
927 | ||
928 | // Get the dynamic reloc section, creating it if necessary. | |
929 | Reloc_section* | |
0ffd9845 | 930 | rela_dyn_section(Layout*); |
2e30d253 | 931 | |
e291e7b9 ILT |
932 | // Get the section to use for TLSDESC relocations. |
933 | Reloc_section* | |
934 | rela_tlsdesc_section(Layout*) const; | |
935 | ||
67181c72 ILT |
936 | // Get the section to use for IRELATIVE relocations. |
937 | Reloc_section* | |
938 | rela_irelative_section(Layout*); | |
939 | ||
12c0daef | 940 | // Add a potential copy relocation. |
2e30d253 | 941 | void |
ef9beddf | 942 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 943 | Sized_relobj_file<size, false>* object, |
12c0daef | 944 | unsigned int shndx, Output_section* output_section, |
fc51264f | 945 | Symbol* sym, const elfcpp::Rela<size, false>& reloc) |
12c0daef ILT |
946 | { |
947 | this->copy_relocs_.copy_reloc(symtab, layout, | |
fc51264f | 948 | symtab->get_sized_symbol<size>(sym), |
12c0daef ILT |
949 | object, shndx, output_section, |
950 | reloc, this->rela_dyn_section(layout)); | |
951 | } | |
2e30d253 ILT |
952 | |
953 | // Information about this specific target which we pass to the | |
954 | // general Target structure. | |
955 | static const Target::Target_info x86_64_info; | |
956 | ||
0e70b911 CC |
957 | // The types of GOT entries needed for this platform. |
958 | // These values are exposed to the ABI in an incremental link. | |
959 | // Do not renumber existing values without changing the version | |
960 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
961 | enum Got_type |
962 | { | |
963 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
964 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
965 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
966 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
967 | }; | |
968 | ||
e291e7b9 ILT |
969 | // This type is used as the argument to the target specific |
970 | // relocation routines. The only target specific reloc is | |
971 | // R_X86_64_TLSDESC against a local symbol. | |
972 | struct Tlsdesc_info | |
973 | { | |
fc51264f | 974 | Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym) |
e291e7b9 ILT |
975 | : object(a_object), r_sym(a_r_sym) |
976 | { } | |
977 | ||
978 | // The object in which the local symbol is defined. | |
fc51264f | 979 | Sized_relobj_file<size, false>* object; |
e291e7b9 ILT |
980 | // The local symbol index in the object. |
981 | unsigned int r_sym; | |
982 | }; | |
983 | ||
2e30d253 ILT |
984 | // The GOT section. |
985 | Output_data_got<64, false>* got_; | |
986 | // The PLT section. | |
fc51264f | 987 | Output_data_plt_x86_64<size>* plt_; |
2e30d253 | 988 | // The GOT PLT section. |
57b2284c | 989 | Output_data_got_plt_x86_64* got_plt_; |
67181c72 ILT |
990 | // The GOT section for IRELATIVE relocations. |
991 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
992 | // The GOT section for TLSDESC relocations. |
993 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
994 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
995 | Symbol* global_offset_table_; | |
2e30d253 | 996 | // The dynamic reloc section. |
0ffd9845 | 997 | Reloc_section* rela_dyn_; |
67181c72 ILT |
998 | // The section to use for IRELATIVE relocs. |
999 | Reloc_section* rela_irelative_; | |
2e30d253 | 1000 | // Relocs saved to avoid a COPY reloc. |
fc51264f | 1001 | Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_; |
c2b45e22 | 1002 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 1003 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
1004 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
1005 | // specific relocation. Here we store the object and local symbol | |
1006 | // index for the relocation. | |
1007 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
1008 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
1009 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
1010 | }; |
1011 | ||
fc51264f L |
1012 | template<> |
1013 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
1014 | { |
1015 | 64, // size | |
1016 | false, // is_big_endian | |
1017 | elfcpp::EM_X86_64, // machine_code | |
1018 | false, // has_make_symbol | |
1019 | false, // has_resolve | |
1020 | true, // has_code_fill | |
35cdfc9a | 1021 | true, // is_default_stack_executable |
b3ce541e | 1022 | true, // can_icf_inline_merge_sections |
0864d551 | 1023 | '\0', // wrap_char |
2e30d253 | 1024 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 1025 | 0x400000, // default_text_segment_address |
cd72c291 | 1026 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 1027 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
1028 | false, // isolate_execinstr |
1029 | 0, // rosegment_gap | |
8a5e3e08 ILT |
1030 | elfcpp::SHN_UNDEF, // small_common_shndx |
1031 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1032 | 0, // small_common_section_flags | |
05a352e6 DK |
1033 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
1034 | NULL, // attributes_section | |
a67858e0 CC |
1035 | NULL, // attributes_vendor |
1036 | "_start" // entry_symbol_name | |
2e30d253 ILT |
1037 | }; |
1038 | ||
fc51264f L |
1039 | template<> |
1040 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
1041 | { | |
1042 | 32, // size | |
1043 | false, // is_big_endian | |
1044 | elfcpp::EM_X86_64, // machine_code | |
1045 | false, // has_make_symbol | |
1046 | false, // has_resolve | |
1047 | true, // has_code_fill | |
1048 | true, // is_default_stack_executable | |
1049 | true, // can_icf_inline_merge_sections | |
1050 | '\0', // wrap_char | |
1051 | "/libx32/ldx32.so.1", // program interpreter | |
1052 | 0x400000, // default_text_segment_address | |
1053 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
1054 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2e702c99 RM |
1055 | false, // isolate_execinstr |
1056 | 0, // rosegment_gap | |
fc51264f L |
1057 | elfcpp::SHN_UNDEF, // small_common_shndx |
1058 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1059 | 0, // small_common_section_flags | |
1060 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
1061 | NULL, // attributes_section | |
a67858e0 CC |
1062 | NULL, // attributes_vendor |
1063 | "_start" // entry_symbol_name | |
fc51264f L |
1064 | }; |
1065 | ||
8a5e3e08 ILT |
1066 | // This is called when a new output section is created. This is where |
1067 | // we handle the SHF_X86_64_LARGE. | |
1068 | ||
fc51264f | 1069 | template<int size> |
8a5e3e08 | 1070 | void |
fc51264f | 1071 | Target_x86_64<size>::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
1072 | { |
1073 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
1074 | os->set_is_large_section(); | |
1075 | } | |
1076 | ||
2e30d253 ILT |
1077 | // Get the GOT section, creating it if necessary. |
1078 | ||
fc51264f | 1079 | template<int size> |
2e30d253 | 1080 | Output_data_got<64, false>* |
fc51264f | 1081 | Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout) |
2e30d253 ILT |
1082 | { |
1083 | if (this->got_ == NULL) | |
1084 | { | |
1085 | gold_assert(symtab != NULL && layout != NULL); | |
1086 | ||
9446efde ILT |
1087 | // When using -z now, we can treat .got.plt as a relro section. |
1088 | // Without -z now, it is modified after program startup by lazy | |
1089 | // PLT relocations. | |
1090 | bool is_got_plt_relro = parameters->options().now(); | |
1091 | Output_section_order got_order = (is_got_plt_relro | |
1092 | ? ORDER_RELRO | |
1093 | : ORDER_RELRO_LAST); | |
1094 | Output_section_order got_plt_order = (is_got_plt_relro | |
1095 | ? ORDER_RELRO | |
1096 | : ORDER_NON_RELRO_FIRST); | |
1097 | ||
2e30d253 ILT |
1098 | this->got_ = new Output_data_got<64, false>(); |
1099 | ||
82742395 ILT |
1100 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
1101 | (elfcpp::SHF_ALLOC | |
1102 | | elfcpp::SHF_WRITE), | |
9446efde | 1103 | this->got_, got_order, true); |
2e30d253 | 1104 | |
57b2284c | 1105 | this->got_plt_ = new Output_data_got_plt_x86_64(layout); |
82742395 ILT |
1106 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1107 | (elfcpp::SHF_ALLOC | |
1108 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
1109 | this->got_plt_, got_plt_order, |
1110 | is_got_plt_relro); | |
2e30d253 ILT |
1111 | |
1112 | // The first three entries are reserved. | |
27bc2bce | 1113 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 1114 | |
9446efde ILT |
1115 | if (!is_got_plt_relro) |
1116 | { | |
1117 | // Those bytes can go into the relro segment. | |
1118 | layout->increase_relro(3 * 8); | |
1119 | } | |
1a2dff53 | 1120 | |
2e30d253 | 1121 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
1122 | this->global_offset_table_ = |
1123 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1124 | Symbol_table::PREDEFINED, | |
1125 | this->got_plt_, | |
1126 | 0, 0, elfcpp::STT_OBJECT, | |
1127 | elfcpp::STB_LOCAL, | |
1128 | elfcpp::STV_HIDDEN, 0, | |
1129 | false, false); | |
a8df5856 | 1130 | |
67181c72 ILT |
1131 | // If there are any IRELATIVE relocations, they get GOT entries |
1132 | // in .got.plt after the jump slot entries. | |
1133 | this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT"); | |
1134 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1135 | (elfcpp::SHF_ALLOC | |
1136 | | elfcpp::SHF_WRITE), | |
1137 | this->got_irelative_, | |
9446efde | 1138 | got_plt_order, is_got_plt_relro); |
67181c72 | 1139 | |
a8df5856 | 1140 | // If there are any TLSDESC relocations, they get GOT entries in |
67181c72 | 1141 | // .got.plt after the jump slot and IRELATIVE entries. |
a8df5856 ILT |
1142 | this->got_tlsdesc_ = new Output_data_got<64, false>(); |
1143 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1144 | (elfcpp::SHF_ALLOC | |
1145 | | elfcpp::SHF_WRITE), | |
22f0da72 | 1146 | this->got_tlsdesc_, |
9446efde | 1147 | got_plt_order, is_got_plt_relro); |
2e30d253 ILT |
1148 | } |
1149 | ||
1150 | return this->got_; | |
1151 | } | |
1152 | ||
1153 | // Get the dynamic reloc section, creating it if necessary. | |
1154 | ||
fc51264f L |
1155 | template<int size> |
1156 | typename Target_x86_64<size>::Reloc_section* | |
1157 | Target_x86_64<size>::rela_dyn_section(Layout* layout) | |
2e30d253 | 1158 | { |
0ffd9845 | 1159 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
1160 | { |
1161 | gold_assert(layout != NULL); | |
d98bc257 | 1162 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 1163 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
1164 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
1165 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 1166 | } |
0ffd9845 | 1167 | return this->rela_dyn_; |
2e30d253 ILT |
1168 | } |
1169 | ||
67181c72 ILT |
1170 | // Get the section to use for IRELATIVE relocs, creating it if |
1171 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
1172 | // relocations. They need to follow the other dynamic relocations so | |
1173 | // that they can refer to global variables initialized by those | |
1174 | // relocs. | |
1175 | ||
fc51264f L |
1176 | template<int size> |
1177 | typename Target_x86_64<size>::Reloc_section* | |
1178 | Target_x86_64<size>::rela_irelative_section(Layout* layout) | |
67181c72 ILT |
1179 | { |
1180 | if (this->rela_irelative_ == NULL) | |
1181 | { | |
1182 | // Make sure we have already created the dynamic reloc section. | |
1183 | this->rela_dyn_section(layout); | |
1184 | this->rela_irelative_ = new Reloc_section(false); | |
1185 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
1186 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
1187 | ORDER_DYNAMIC_RELOCS, false); | |
1188 | gold_assert(this->rela_dyn_->output_section() | |
1189 | == this->rela_irelative_->output_section()); | |
1190 | } | |
1191 | return this->rela_irelative_; | |
1192 | } | |
1193 | ||
57b2284c CC |
1194 | // Write the first three reserved words of the .got.plt section. |
1195 | // The remainder of the section is written while writing the PLT | |
1196 | // in Output_data_plt_i386::do_write. | |
1197 | ||
1198 | void | |
1199 | Output_data_got_plt_x86_64::do_write(Output_file* of) | |
1200 | { | |
1201 | // The first entry in the GOT is the address of the .dynamic section | |
1202 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1203 | // We saved space for them when we created the section in | |
1204 | // Target_x86_64::got_section. | |
1205 | const off_t got_file_offset = this->offset(); | |
1206 | gold_assert(this->data_size() >= 24); | |
1207 | unsigned char* const got_view = of->get_output_view(got_file_offset, 24); | |
1208 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1209 | uint64_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1210 | elfcpp::Swap<64, false>::writeval(got_view, dynamic_addr); | |
1211 | memset(got_view + 8, 0, 16); | |
1212 | of->write_output_view(got_file_offset, 24, got_view); | |
1213 | } | |
1214 | ||
4829d394 | 1215 | // Initialize the PLT section. |
2e30d253 | 1216 | |
fc51264f | 1217 | template<int size> |
4829d394 | 1218 | void |
fc51264f | 1219 | Output_data_plt_x86_64<size>::init(Layout* layout) |
2e30d253 | 1220 | { |
d98bc257 | 1221 | this->rel_ = new Reloc_section(false); |
2e30d253 | 1222 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
1223 | elfcpp::SHF_ALLOC, this->rel_, |
1224 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2e30d253 ILT |
1225 | } |
1226 | ||
fc51264f | 1227 | template<int size> |
2e30d253 | 1228 | void |
fc51264f | 1229 | Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os) |
2e30d253 | 1230 | { |
2e702c99 | 1231 | os->set_entsize(this->get_plt_entry_size()); |
2e30d253 ILT |
1232 | } |
1233 | ||
1234 | // Add an entry to the PLT. | |
1235 | ||
fc51264f | 1236 | template<int size> |
2e30d253 | 1237 | void |
fc51264f L |
1238 | Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout, |
1239 | Symbol* gsym) | |
2e30d253 ILT |
1240 | { |
1241 | gold_assert(!gsym->has_plt_offset()); | |
1242 | ||
4829d394 CC |
1243 | unsigned int plt_index; |
1244 | off_t plt_offset; | |
1245 | section_offset_type got_offset; | |
2e30d253 | 1246 | |
67181c72 ILT |
1247 | unsigned int* pcount; |
1248 | unsigned int offset; | |
1249 | unsigned int reserved; | |
57b2284c | 1250 | Output_section_data_build* got; |
67181c72 ILT |
1251 | if (gsym->type() == elfcpp::STT_GNU_IFUNC |
1252 | && gsym->can_use_relative_reloc(false)) | |
1253 | { | |
1254 | pcount = &this->irelative_count_; | |
1255 | offset = 0; | |
1256 | reserved = 0; | |
1257 | got = this->got_irelative_; | |
1258 | } | |
1259 | else | |
1260 | { | |
1261 | pcount = &this->count_; | |
1262 | offset = 1; | |
1263 | reserved = 3; | |
1264 | got = this->got_plt_; | |
1265 | } | |
1266 | ||
4829d394 CC |
1267 | if (!this->is_data_size_valid()) |
1268 | { | |
67181c72 ILT |
1269 | // Note that when setting the PLT offset for a non-IRELATIVE |
1270 | // entry we skip the initial reserved PLT entry. | |
1271 | plt_index = *pcount + offset; | |
2e702c99 | 1272 | plt_offset = plt_index * this->get_plt_entry_size(); |
2e30d253 | 1273 | |
67181c72 | 1274 | ++*pcount; |
2e30d253 | 1275 | |
67181c72 ILT |
1276 | got_offset = (plt_index - offset + reserved) * 8; |
1277 | gold_assert(got_offset == got->current_data_size()); | |
2e30d253 | 1278 | |
4829d394 CC |
1279 | // Every PLT entry needs a GOT entry which points back to the PLT |
1280 | // entry (this will be changed by the dynamic linker, normally | |
1281 | // lazily when the function is called). | |
67181c72 | 1282 | got->set_current_data_size(got_offset + 8); |
4829d394 | 1283 | } |
7223e9ca ILT |
1284 | else |
1285 | { | |
67181c72 ILT |
1286 | // FIXME: This is probably not correct for IRELATIVE relocs. |
1287 | ||
4829d394 | 1288 | // For incremental updates, find an available slot. |
2e702c99 RM |
1289 | plt_offset = this->free_list_.allocate(this->get_plt_entry_size(), |
1290 | this->get_plt_entry_size(), 0); | |
4829d394 | 1291 | if (plt_offset == -1) |
e6455dfb CC |
1292 | gold_fallback(_("out of patch space (PLT);" |
1293 | " relink with --incremental-full")); | |
4829d394 CC |
1294 | |
1295 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
1296 | // can be calculated from the PLT index, adjusting for the three | |
1297 | // reserved entries at the beginning of the GOT. | |
2e702c99 | 1298 | plt_index = plt_offset / this->get_plt_entry_size() - 1; |
67181c72 | 1299 | got_offset = (plt_index - offset + reserved) * 8; |
7223e9ca | 1300 | } |
2e30d253 | 1301 | |
4829d394 CC |
1302 | gsym->set_plt_offset(plt_offset); |
1303 | ||
1304 | // Every PLT entry needs a reloc. | |
67181c72 | 1305 | this->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 | 1306 | |
2e30d253 ILT |
1307 | // Note that we don't need to save the symbol. The contents of the |
1308 | // PLT are independent of which symbols are used. The symbols only | |
1309 | // appear in the relocations. | |
1310 | } | |
1311 | ||
7223e9ca ILT |
1312 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1313 | // the PLT offset. | |
1314 | ||
fc51264f | 1315 | template<int size> |
7223e9ca | 1316 | unsigned int |
fc51264f | 1317 | Output_data_plt_x86_64<size>::add_local_ifunc_entry( |
67181c72 ILT |
1318 | Symbol_table* symtab, |
1319 | Layout* layout, | |
fc51264f | 1320 | Sized_relobj_file<size, false>* relobj, |
6fa2a40b | 1321 | unsigned int local_sym_index) |
7223e9ca | 1322 | { |
2e702c99 | 1323 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1324 | ++this->irelative_count_; |
7223e9ca | 1325 | |
67181c72 | 1326 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1327 | |
1328 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1329 | // entry. | |
67181c72 | 1330 | this->got_irelative_->set_current_data_size(got_offset + 8); |
7223e9ca ILT |
1331 | |
1332 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1333 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
1334 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
1335 | elfcpp::R_X86_64_IRELATIVE, | |
1336 | this->got_irelative_, got_offset, 0); | |
7223e9ca ILT |
1337 | |
1338 | return plt_offset; | |
1339 | } | |
1340 | ||
4829d394 CC |
1341 | // Add the relocation for a PLT entry. |
1342 | ||
fc51264f | 1343 | template<int size> |
4829d394 | 1344 | void |
fc51264f L |
1345 | Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab, |
1346 | Layout* layout, | |
1347 | Symbol* gsym, | |
1348 | unsigned int got_offset) | |
4829d394 CC |
1349 | { |
1350 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1351 | && gsym->can_use_relative_reloc(false)) | |
67181c72 ILT |
1352 | { |
1353 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
1354 | rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
1355 | this->got_irelative_, got_offset, 0); | |
1356 | } | |
4829d394 CC |
1357 | else |
1358 | { | |
1359 | gsym->set_needs_dynsym_entry(); | |
1360 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
1361 | got_offset, 0); | |
1362 | } | |
1363 | } | |
1364 | ||
e291e7b9 ILT |
1365 | // Return where the TLSDESC relocations should go, creating it if |
1366 | // necessary. These follow the JUMP_SLOT relocations. | |
1367 | ||
fc51264f L |
1368 | template<int size> |
1369 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1370 | Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout) | |
e291e7b9 ILT |
1371 | { |
1372 | if (this->tlsdesc_rel_ == NULL) | |
1373 | { | |
1374 | this->tlsdesc_rel_ = new Reloc_section(false); | |
1375 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1376 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 1377 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1378 | gold_assert(this->tlsdesc_rel_->output_section() |
1379 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1380 | } |
1381 | return this->tlsdesc_rel_; | |
1382 | } | |
1383 | ||
67181c72 ILT |
1384 | // Return where the IRELATIVE relocations should go in the PLT. These |
1385 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
1386 | ||
fc51264f L |
1387 | template<int size> |
1388 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1389 | Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab, | |
1390 | Layout* layout) | |
67181c72 ILT |
1391 | { |
1392 | if (this->irelative_rel_ == NULL) | |
1393 | { | |
1394 | // Make sure we have a place for the TLSDESC relocations, in | |
1395 | // case we see any later on. | |
1396 | this->rela_tlsdesc(layout); | |
1397 | this->irelative_rel_ = new Reloc_section(false); | |
1398 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1399 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1400 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1401 | gold_assert(this->irelative_rel_->output_section() | |
1402 | == this->rel_->output_section()); | |
1403 | ||
1404 | if (parameters->doing_static_link()) | |
1405 | { | |
1406 | // A statically linked executable will only have a .rela.plt | |
1407 | // section to hold R_X86_64_IRELATIVE relocs for | |
1408 | // STT_GNU_IFUNC symbols. The library will use these | |
1409 | // symbols to locate the IRELATIVE relocs at program startup | |
1410 | // time. | |
1411 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
1412 | Symbol_table::PREDEFINED, | |
1413 | this->irelative_rel_, 0, 0, | |
1414 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1415 | elfcpp::STV_HIDDEN, 0, false, true); | |
1416 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
1417 | Symbol_table::PREDEFINED, | |
1418 | this->irelative_rel_, 0, 0, | |
1419 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1420 | elfcpp::STV_HIDDEN, 0, true, true); | |
1421 | } | |
1422 | } | |
1423 | return this->irelative_rel_; | |
1424 | } | |
1425 | ||
1426 | // Return the PLT address to use for a global symbol. | |
1427 | ||
fc51264f | 1428 | template<int size> |
67181c72 | 1429 | uint64_t |
fc51264f | 1430 | Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym) |
67181c72 ILT |
1431 | { |
1432 | uint64_t offset = 0; | |
1433 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1434 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1435 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1436 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1437 | } |
1438 | ||
1439 | // Return the PLT address to use for a local symbol. These are always | |
1440 | // IRELATIVE relocs. | |
1441 | ||
fc51264f | 1442 | template<int size> |
67181c72 | 1443 | uint64_t |
19fec8c1 AM |
1444 | Output_data_plt_x86_64<size>::address_for_local(const Relobj* object, |
1445 | unsigned int r_sym) | |
67181c72 | 1446 | { |
19fec8c1 AM |
1447 | return (this->address() |
1448 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1449 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1450 | } |
1451 | ||
c2b45e22 | 1452 | // Set the final size. |
fc51264f | 1453 | template<int size> |
c2b45e22 | 1454 | void |
fc51264f | 1455 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1456 | { |
67181c72 | 1457 | unsigned int count = this->count_ + this->irelative_count_; |
c2b45e22 CC |
1458 | if (this->has_tlsdesc_entry()) |
1459 | ++count; | |
2e702c99 | 1460 | this->set_data_size((count + 1) * this->get_plt_entry_size()); |
c2b45e22 CC |
1461 | } |
1462 | ||
2e30d253 ILT |
1463 | // The first entry in the PLT for an executable. |
1464 | ||
fc51264f L |
1465 | template<int size> |
1466 | const unsigned char | |
2e702c99 | 1467 | Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] = |
2e30d253 ILT |
1468 | { |
1469 | // From AMD64 ABI Draft 0.98, page 76 | |
1470 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1471 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1472 | 0xff, 0x25, // jmp indirect |
1473 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1474 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1475 | }; | |
1476 | ||
2e702c99 RM |
1477 | template<int size> |
1478 | void | |
1479 | Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry( | |
1480 | unsigned char* pov, | |
1481 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1482 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
1483 | { | |
1484 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1485 | // We do a jmp relative to the PC at the end of this instruction. | |
1486 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1487 | (got_address + 8 | |
1488 | - (plt_address + 6))); | |
1489 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1490 | (got_address + 16 | |
1491 | - (plt_address + 12))); | |
1492 | } | |
1493 | ||
2e30d253 ILT |
1494 | // Subsequent entries 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>::plt_entry[plt_entry_size] = |
2e30d253 ILT |
1499 | { |
1500 | // From AMD64 ABI Draft 0.98, page 76 | |
1501 | 0xff, 0x25, // jmpq indirect | |
1502 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1503 | 0x68, // pushq immediate | |
1504 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1505 | 0xe9, // jmpq relative | |
1506 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1507 | }; | |
1508 | ||
2e702c99 RM |
1509 | template<int size> |
1510 | unsigned int | |
1511 | Output_data_plt_x86_64_standard<size>::do_fill_plt_entry( | |
1512 | unsigned char* pov, | |
1513 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1514 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1515 | unsigned int got_offset, | |
1516 | unsigned int plt_offset, | |
1517 | unsigned int plt_index) | |
1518 | { | |
9d585188 L |
1519 | // Check PC-relative offset overflow in PLT entry. |
1520 | uint64_t plt_got_pcrel_offset = (got_address + got_offset | |
1521 | - (plt_address + plt_offset + 6)); | |
1522 | if (Bits<32>::has_overflow(plt_got_pcrel_offset)) | |
1523 | gold_error(_("PC-relative offset overflow in PLT entry %d"), | |
1524 | plt_index + 1); | |
1525 | ||
2e702c99 RM |
1526 | memcpy(pov, plt_entry, plt_entry_size); |
1527 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
9d585188 | 1528 | plt_got_pcrel_offset); |
2e702c99 RM |
1529 | |
1530 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1531 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1532 | - (plt_offset + plt_entry_size)); | |
1533 | ||
1534 | return 6; | |
1535 | } | |
1536 | ||
c2b45e22 CC |
1537 | // The reserved TLSDESC entry in the PLT for an executable. |
1538 | ||
fc51264f L |
1539 | template<int size> |
1540 | const unsigned char | |
2e702c99 | 1541 | Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] = |
c2b45e22 CC |
1542 | { |
1543 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1544 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1545 | 0xff, 0x35, // pushq x(%rip) | |
1546 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1547 | 0xff, 0x25, // jmpq *y(%rip) | |
1548 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1549 | 0x0f, 0x1f, // nop | |
1550 | 0x40, 0 | |
1551 | }; | |
1552 | ||
2e702c99 RM |
1553 | template<int size> |
1554 | void | |
1555 | Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry( | |
1556 | unsigned char* pov, | |
1557 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1558 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1559 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
1560 | unsigned int tlsdesc_got_offset, | |
1561 | unsigned int plt_offset) | |
1562 | { | |
1563 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1564 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1565 | (got_address + 8 | |
1566 | - (plt_address + plt_offset | |
1567 | + 6))); | |
1568 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1569 | (got_base | |
1570 | + tlsdesc_got_offset | |
1571 | - (plt_address + plt_offset | |
1572 | + 12))); | |
1573 | } | |
1574 | ||
07a60597 ILT |
1575 | // The .eh_frame unwind information for the PLT. |
1576 | ||
fc51264f | 1577 | template<int size> |
2e702c99 | 1578 | const unsigned char |
fc51264f | 1579 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
1580 | { |
1581 | 1, // CIE version. | |
1582 | 'z', // Augmentation: augmentation size included. | |
1583 | 'R', // Augmentation: FDE encoding included. | |
1584 | '\0', // End of augmentation string. | |
1585 | 1, // Code alignment factor. | |
1586 | 0x78, // Data alignment factor. | |
1587 | 16, // Return address column. | |
1588 | 1, // Augmentation size. | |
1589 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1590 | | elfcpp::DW_EH_PE_sdata4), | |
1591 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
1592 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
1593 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1594 | elfcpp::DW_CFA_nop | |
1595 | }; | |
1596 | ||
fc51264f | 1597 | template<int size> |
07a60597 | 1598 | const unsigned char |
2e702c99 | 1599 | Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1600 | { |
1601 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1602 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1603 | 0, // Augmentation size. | |
1604 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
1605 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1606 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
1607 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1608 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1609 | 11, // Block length. | |
1610 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
1611 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
1612 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1613 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
1614 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1615 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
1616 | elfcpp::DW_OP_lit3, // Push 3. | |
1617 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
1618 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
1619 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
1620 | elfcpp::DW_CFA_nop, | |
1621 | elfcpp::DW_CFA_nop, | |
1622 | elfcpp::DW_CFA_nop | |
1623 | }; | |
1624 | ||
2e30d253 ILT |
1625 | // Write out the PLT. This uses the hand-coded instructions above, |
1626 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
1627 | ||
fc51264f | 1628 | template<int size> |
2e30d253 | 1629 | void |
fc51264f | 1630 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 1631 | { |
2ea97941 | 1632 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1633 | const section_size_type oview_size = |
1634 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1635 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
1636 | |
1637 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1638 | gold_assert(parameters->incremental_update() |
1639 | || (got_file_offset + this->got_plt_->data_size() | |
1640 | == this->got_irelative_->offset())); | |
fe8718a4 | 1641 | const section_size_type got_size = |
67181c72 ILT |
1642 | convert_to_section_size_type(this->got_plt_->data_size() |
1643 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
1644 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1645 | got_size); | |
1646 | ||
1647 | unsigned char* pov = oview; | |
1648 | ||
c2b45e22 | 1649 | // The base address of the .plt section. |
fc51264f | 1650 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 1651 | // The base address of the .got section. |
fc51264f | 1652 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
1653 | // The base address of the PLT portion of the .got section, |
1654 | // which is where the GOT pointer will point, and where the | |
1655 | // three reserved GOT entries are located. | |
fc51264f L |
1656 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
1657 | = this->got_plt_->address(); | |
2e30d253 | 1658 | |
2e702c99 RM |
1659 | this->fill_first_plt_entry(pov, got_address, plt_address); |
1660 | pov += this->get_plt_entry_size(); | |
2e30d253 | 1661 | |
57b2284c CC |
1662 | // The first three entries in the GOT are reserved, and are written |
1663 | // by Output_data_got_plt_x86_64::do_write. | |
1664 | unsigned char* got_pov = got_view + 24; | |
2e30d253 | 1665 | |
2e702c99 | 1666 | unsigned int plt_offset = this->get_plt_entry_size(); |
2e30d253 | 1667 | unsigned int got_offset = 24; |
67181c72 | 1668 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
1669 | for (unsigned int plt_index = 0; |
1670 | plt_index < count; | |
1671 | ++plt_index, | |
2e702c99 | 1672 | pov += this->get_plt_entry_size(), |
2e30d253 | 1673 | got_pov += 8, |
2e702c99 | 1674 | plt_offset += this->get_plt_entry_size(), |
2e30d253 ILT |
1675 | got_offset += 8) |
1676 | { | |
1677 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1678 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1679 | got_address, plt_address, | |
1680 | got_offset, plt_offset, | |
1681 | plt_index); | |
2e30d253 ILT |
1682 | |
1683 | // Set the entry in the GOT. | |
2e702c99 RM |
1684 | elfcpp::Swap<64, false>::writeval(got_pov, |
1685 | plt_address + plt_offset + lazy_offset); | |
2e30d253 ILT |
1686 | } |
1687 | ||
c2b45e22 CC |
1688 | if (this->has_tlsdesc_entry()) |
1689 | { | |
1690 | // Set and adjust the reserved TLSDESC PLT entry. | |
1691 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2e702c99 RM |
1692 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, |
1693 | tlsdesc_got_offset, plt_offset); | |
1694 | pov += this->get_plt_entry_size(); | |
c2b45e22 CC |
1695 | } |
1696 | ||
fe8718a4 ILT |
1697 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1698 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1699 | |
2ea97941 | 1700 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1701 | of->write_output_view(got_file_offset, got_size, got_view); |
1702 | } | |
1703 | ||
c2b45e22 | 1704 | // Create the PLT section. |
2e30d253 | 1705 | |
fc51264f | 1706 | template<int size> |
2e30d253 | 1707 | void |
fc51264f | 1708 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1709 | { |
2e30d253 ILT |
1710 | if (this->plt_ == NULL) |
1711 | { | |
1712 | // Create the GOT sections first. | |
1713 | this->got_section(symtab, layout); | |
1714 | ||
2e702c99 RM |
1715 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
1716 | this->got_irelative_); | |
1717 | ||
1718 | // Add unwind information if requested. | |
1719 | if (parameters->options().ld_generated_unwind_info()) | |
1720 | this->plt_->add_eh_frame(layout); | |
1721 | ||
2e30d253 ILT |
1722 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1723 | (elfcpp::SHF_ALLOC | |
1724 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1725 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1726 | |
1727 | // Make the sh_info field of .rela.plt point to .plt. | |
1728 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1729 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1730 | } |
c2b45e22 CC |
1731 | } |
1732 | ||
e291e7b9 ILT |
1733 | // Return the section for TLSDESC relocations. |
1734 | ||
fc51264f L |
1735 | template<int size> |
1736 | typename Target_x86_64<size>::Reloc_section* | |
1737 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
1738 | { |
1739 | return this->plt_section()->rela_tlsdesc(layout); | |
1740 | } | |
1741 | ||
c2b45e22 CC |
1742 | // Create a PLT entry for a global symbol. |
1743 | ||
fc51264f | 1744 | template<int size> |
c2b45e22 | 1745 | void |
fc51264f L |
1746 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
1747 | Symbol* gsym) | |
c2b45e22 CC |
1748 | { |
1749 | if (gsym->has_plt_offset()) | |
1750 | return; | |
1751 | ||
1752 | if (this->plt_ == NULL) | |
1753 | this->make_plt_section(symtab, layout); | |
2e30d253 | 1754 | |
67181c72 | 1755 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
1756 | } |
1757 | ||
7223e9ca ILT |
1758 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1759 | ||
fc51264f | 1760 | template<int size> |
7223e9ca | 1761 | void |
fc51264f L |
1762 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
1763 | Symbol_table* symtab, Layout* layout, | |
1764 | Sized_relobj_file<size, false>* relobj, | |
1765 | unsigned int local_sym_index) | |
7223e9ca ILT |
1766 | { |
1767 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1768 | return; | |
1769 | if (this->plt_ == NULL) | |
1770 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1771 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1772 | relobj, | |
7223e9ca ILT |
1773 | local_sym_index); |
1774 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1775 | } | |
1776 | ||
0e70b911 CC |
1777 | // Return the number of entries in the PLT. |
1778 | ||
fc51264f | 1779 | template<int size> |
0e70b911 | 1780 | unsigned int |
fc51264f | 1781 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
1782 | { |
1783 | if (this->plt_ == NULL) | |
1784 | return 0; | |
1785 | return this->plt_->entry_count(); | |
1786 | } | |
1787 | ||
1788 | // Return the offset of the first non-reserved PLT entry. | |
1789 | ||
fc51264f | 1790 | template<int size> |
0e70b911 | 1791 | unsigned int |
fc51264f | 1792 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 1793 | { |
2e702c99 | 1794 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1795 | } |
1796 | ||
1797 | // Return the size of each PLT entry. | |
1798 | ||
fc51264f | 1799 | template<int size> |
0e70b911 | 1800 | unsigned int |
fc51264f | 1801 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 1802 | { |
2e702c99 | 1803 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1804 | } |
1805 | ||
4829d394 CC |
1806 | // Create the GOT and PLT sections for an incremental update. |
1807 | ||
fc51264f | 1808 | template<int size> |
dd74ae06 | 1809 | Output_data_got_base* |
fc51264f | 1810 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
1811 | Layout* layout, |
1812 | unsigned int got_count, | |
1813 | unsigned int plt_count) | |
1814 | { | |
1815 | gold_assert(this->got_ == NULL); | |
1816 | ||
1817 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
1818 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1819 | (elfcpp::SHF_ALLOC | |
1820 | | elfcpp::SHF_WRITE), | |
1821 | this->got_, ORDER_RELRO_LAST, | |
1822 | true); | |
1823 | ||
1824 | // Add the three reserved entries. | |
57b2284c | 1825 | this->got_plt_ = new Output_data_got_plt_x86_64(layout, (plt_count + 3) * 8); |
4829d394 CC |
1826 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1827 | (elfcpp::SHF_ALLOC | |
1828 | | elfcpp::SHF_WRITE), | |
1829 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
1830 | false); | |
1831 | ||
1832 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1833 | this->global_offset_table_ = | |
1834 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1835 | Symbol_table::PREDEFINED, | |
1836 | this->got_plt_, | |
1837 | 0, 0, elfcpp::STT_OBJECT, | |
1838 | elfcpp::STB_LOCAL, | |
1839 | elfcpp::STV_HIDDEN, 0, | |
1840 | false, false); | |
1841 | ||
1842 | // If there are any TLSDESC relocations, they get GOT entries in | |
1843 | // .got.plt after the jump slot entries. | |
1844 | // FIXME: Get the count for TLSDESC entries. | |
1845 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
1846 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1847 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1848 | this->got_tlsdesc_, | |
1849 | ORDER_NON_RELRO_FIRST, false); | |
1850 | ||
67181c72 ILT |
1851 | // If there are any IRELATIVE relocations, they get GOT entries in |
1852 | // .got.plt after the jump slot and TLSDESC entries. | |
1853 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
1854 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1855 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1856 | this->got_irelative_, | |
1857 | ORDER_NON_RELRO_FIRST, false); | |
1858 | ||
4829d394 | 1859 | // Create the PLT section. |
2e702c99 RM |
1860 | this->plt_ = this->make_data_plt(layout, this->got_, |
1861 | this->got_plt_, | |
1862 | this->got_irelative_, | |
1863 | plt_count); | |
1864 | ||
1865 | // Add unwind information if requested. | |
1866 | if (parameters->options().ld_generated_unwind_info()) | |
1867 | this->plt_->add_eh_frame(layout); | |
1868 | ||
4829d394 CC |
1869 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1870 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
1871 | this->plt_, ORDER_PLT, false); | |
1872 | ||
1873 | // Make the sh_info field of .rela.plt point to .plt. | |
1874 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1875 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
1876 | ||
6fa2a40b CC |
1877 | // Create the rela_dyn section. |
1878 | this->rela_dyn_section(layout); | |
1879 | ||
4829d394 CC |
1880 | return this->got_; |
1881 | } | |
1882 | ||
6fa2a40b CC |
1883 | // Reserve a GOT entry for a local symbol, and regenerate any |
1884 | // necessary dynamic relocations. | |
1885 | ||
fc51264f | 1886 | template<int size> |
6fa2a40b | 1887 | void |
fc51264f | 1888 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 1889 | unsigned int got_index, |
fc51264f | 1890 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
1891 | unsigned int r_sym, |
1892 | unsigned int got_type) | |
1893 | { | |
1894 | unsigned int got_offset = got_index * 8; | |
1895 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1896 | ||
1897 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
1898 | switch (got_type) | |
1899 | { | |
1900 | case GOT_TYPE_STANDARD: | |
1901 | if (parameters->options().output_is_position_independent()) | |
1902 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 1903 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1904 | break; |
1905 | case GOT_TYPE_TLS_OFFSET: | |
1906 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
1907 | this->got_, got_offset, 0); | |
1908 | break; | |
1909 | case GOT_TYPE_TLS_PAIR: | |
1910 | this->got_->reserve_slot(got_index + 1); | |
1911 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
1912 | this->got_, got_offset, 0); | |
1913 | break; | |
1914 | case GOT_TYPE_TLS_DESC: | |
1915 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
1916 | // this->got_->reserve_slot(got_index + 1); | |
1917 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1918 | // this->got_, got_offset, 0); | |
1919 | break; | |
1920 | default: | |
1921 | gold_unreachable(); | |
1922 | } | |
1923 | } | |
1924 | ||
1925 | // Reserve a GOT entry for a global symbol, and regenerate any | |
1926 | // necessary dynamic relocations. | |
1927 | ||
fc51264f | 1928 | template<int size> |
6fa2a40b | 1929 | void |
fc51264f L |
1930 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
1931 | Symbol* gsym, | |
1932 | unsigned int got_type) | |
6fa2a40b CC |
1933 | { |
1934 | unsigned int got_offset = got_index * 8; | |
1935 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1936 | ||
1937 | this->got_->reserve_global(got_index, gsym, got_type); | |
1938 | switch (got_type) | |
1939 | { | |
1940 | case GOT_TYPE_STANDARD: | |
1941 | if (!gsym->final_value_is_known()) | |
1942 | { | |
1943 | if (gsym->is_from_dynobj() | |
1944 | || gsym->is_undefined() | |
1945 | || gsym->is_preemptible() | |
1946 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1947 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
1948 | this->got_, got_offset, 0); | |
1949 | else | |
1950 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 1951 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1952 | } |
1953 | break; | |
1954 | case GOT_TYPE_TLS_OFFSET: | |
1955 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
13cf9988 | 1956 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1957 | break; |
1958 | case GOT_TYPE_TLS_PAIR: | |
1959 | this->got_->reserve_slot(got_index + 1); | |
1960 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
13cf9988 | 1961 | this->got_, got_offset, 0, false); |
6fa2a40b | 1962 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, |
13cf9988 | 1963 | this->got_, got_offset + 8, 0, false); |
6fa2a40b CC |
1964 | break; |
1965 | case GOT_TYPE_TLS_DESC: | |
1966 | this->got_->reserve_slot(got_index + 1); | |
1967 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
13cf9988 | 1968 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1969 | break; |
1970 | default: | |
1971 | gold_unreachable(); | |
1972 | } | |
1973 | } | |
1974 | ||
4829d394 CC |
1975 | // Register an existing PLT entry for a global symbol. |
1976 | ||
fc51264f | 1977 | template<int size> |
4829d394 | 1978 | void |
fc51264f L |
1979 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
1980 | Layout* layout, | |
1981 | unsigned int plt_index, | |
1982 | Symbol* gsym) | |
4829d394 CC |
1983 | { |
1984 | gold_assert(this->plt_ != NULL); | |
1985 | gold_assert(!gsym->has_plt_offset()); | |
1986 | ||
1987 | this->plt_->reserve_slot(plt_index); | |
1988 | ||
1989 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
1990 | ||
1991 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 1992 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
1993 | } |
1994 | ||
26d3c67d CC |
1995 | // Force a COPY relocation for a given symbol. |
1996 | ||
fc51264f | 1997 | template<int size> |
26d3c67d | 1998 | void |
fc51264f | 1999 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
2000 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
2001 | { | |
2002 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 2003 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
2004 | os, |
2005 | offset, | |
2006 | this->rela_dyn_section(NULL)); | |
2007 | } | |
2008 | ||
9fa33bee | 2009 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 2010 | |
fc51264f | 2011 | template<int size> |
edfbb029 | 2012 | void |
fc51264f L |
2013 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
2014 | Layout* layout) | |
edfbb029 CC |
2015 | { |
2016 | if (this->tls_base_symbol_defined_) | |
2017 | return; | |
2018 | ||
2019 | Output_segment* tls_segment = layout->tls_segment(); | |
2020 | if (tls_segment != NULL) | |
2021 | { | |
183fd0e3 | 2022 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 2023 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 2024 | Symbol_table::PREDEFINED, |
edfbb029 CC |
2025 | tls_segment, 0, 0, |
2026 | elfcpp::STT_TLS, | |
2027 | elfcpp::STB_LOCAL, | |
2028 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
2029 | (is_exec |
2030 | ? Symbol::SEGMENT_END | |
2031 | : Symbol::SEGMENT_START), | |
2032 | true); | |
edfbb029 CC |
2033 | } |
2034 | this->tls_base_symbol_defined_ = true; | |
2035 | } | |
2036 | ||
c2b45e22 CC |
2037 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
2038 | ||
fc51264f | 2039 | template<int size> |
c2b45e22 | 2040 | void |
fc51264f | 2041 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
2e702c99 | 2042 | Layout* layout) |
c2b45e22 CC |
2043 | { |
2044 | if (this->plt_ == NULL) | |
2045 | this->make_plt_section(symtab, layout); | |
2046 | ||
2047 | if (!this->plt_->has_tlsdesc_entry()) | |
2048 | { | |
2049 | // Allocate the TLSDESC_GOT entry. | |
2050 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2051 | unsigned int got_offset = got->add_constant(0); | |
2052 | ||
2053 | // Allocate the TLSDESC_PLT entry. | |
2054 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
2055 | } | |
2056 | } | |
2057 | ||
31d60480 ILT |
2058 | // Create a GOT entry for the TLS module index. |
2059 | ||
fc51264f | 2060 | template<int size> |
31d60480 | 2061 | unsigned int |
fc51264f L |
2062 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
2063 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
2064 | { |
2065 | if (this->got_mod_index_offset_ == -1U) | |
2066 | { | |
2067 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
2068 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
2069 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2070 | unsigned int got_offset = got->add_constant(0); | |
2071 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
2e702c99 | 2072 | got_offset, 0); |
009a67a2 | 2073 | got->add_constant(0); |
31d60480 ILT |
2074 | this->got_mod_index_offset_ = got_offset; |
2075 | } | |
2076 | return this->got_mod_index_offset_; | |
2077 | } | |
2078 | ||
2e30d253 ILT |
2079 | // Optimize the TLS relocation type based on what we know about the |
2080 | // symbol. IS_FINAL is true if the final address of this symbol is | |
2081 | // known at link time. | |
2082 | ||
fc51264f | 2083 | template<int size> |
e041f13d | 2084 | tls::Tls_optimization |
fc51264f | 2085 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 2086 | { |
2e30d253 ILT |
2087 | // If we are generating a shared library, then we can't do anything |
2088 | // in the linker. | |
8851ecca | 2089 | if (parameters->options().shared()) |
e041f13d | 2090 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2091 | |
2092 | switch (r_type) | |
2093 | { | |
2094 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
2095 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2096 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2097 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
2098 | // access. Since we know that we are generating an executable, |
2099 | // we can convert this to Initial-Exec. If we also know that | |
2100 | // this is a local symbol, we can further switch to Local-Exec. | |
2101 | if (is_final) | |
e041f13d ILT |
2102 | return tls::TLSOPT_TO_LE; |
2103 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 2104 | |
d61c17ea | 2105 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
2106 | // This is Local-Dynamic, which refers to a local symbol in the |
2107 | // dynamic TLS block. Since we know that we generating an | |
2108 | // executable, we can switch to Local-Exec. | |
e041f13d | 2109 | return tls::TLSOPT_TO_LE; |
2e30d253 | 2110 | |
0ffd9845 | 2111 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
2112 | case elfcpp::R_X86_64_DTPOFF64: |
2113 | // Another Local-Dynamic reloc. | |
e041f13d | 2114 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 2115 | |
d61c17ea | 2116 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
2117 | // These are Initial-Exec relocs which get the thread offset |
2118 | // from the GOT. If we know that we are linking against the | |
2119 | // local symbol, we can switch to Local-Exec, which links the | |
2120 | // thread offset into the instruction. | |
2121 | if (is_final) | |
e041f13d ILT |
2122 | return tls::TLSOPT_TO_LE; |
2123 | return tls::TLSOPT_NONE; | |
2e30d253 | 2124 | |
d61c17ea | 2125 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
2126 | // When we already have Local-Exec, there is nothing further we |
2127 | // can do. | |
e041f13d | 2128 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2129 | |
2130 | default: | |
2131 | gold_unreachable(); | |
2132 | } | |
2e30d253 ILT |
2133 | } |
2134 | ||
95a2c8d6 RS |
2135 | // Get the Reference_flags for a particular relocation. |
2136 | ||
fc51264f | 2137 | template<int size> |
95a2c8d6 | 2138 | int |
fc51264f | 2139 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
2140 | { |
2141 | switch (r_type) | |
2142 | { | |
2143 | case elfcpp::R_X86_64_NONE: | |
2144 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
2145 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2146 | case elfcpp::R_X86_64_GOTPC32: | |
2147 | case elfcpp::R_X86_64_GOTPC64: | |
2148 | // No symbol reference. | |
2149 | return 0; | |
2150 | ||
2151 | case elfcpp::R_X86_64_64: | |
2152 | case elfcpp::R_X86_64_32: | |
2153 | case elfcpp::R_X86_64_32S: | |
2154 | case elfcpp::R_X86_64_16: | |
2155 | case elfcpp::R_X86_64_8: | |
2156 | return Symbol::ABSOLUTE_REF; | |
2157 | ||
2158 | case elfcpp::R_X86_64_PC64: | |
2159 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2160 | case elfcpp::R_X86_64_PC32_BND: |
95a2c8d6 RS |
2161 | case elfcpp::R_X86_64_PC16: |
2162 | case elfcpp::R_X86_64_PC8: | |
2163 | case elfcpp::R_X86_64_GOTOFF64: | |
2164 | return Symbol::RELATIVE_REF; | |
2165 | ||
2166 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 2167 | case elfcpp::R_X86_64_PLT32_BND: |
95a2c8d6 RS |
2168 | case elfcpp::R_X86_64_PLTOFF64: |
2169 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
2170 | ||
2171 | case elfcpp::R_X86_64_GOT64: | |
2172 | case elfcpp::R_X86_64_GOT32: | |
2173 | case elfcpp::R_X86_64_GOTPCREL64: | |
2174 | case elfcpp::R_X86_64_GOTPCREL: | |
2175 | case elfcpp::R_X86_64_GOTPLT64: | |
2176 | // Absolute in GOT. | |
2177 | return Symbol::ABSOLUTE_REF; | |
2178 | ||
2179 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2180 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2181 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2182 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2183 | case elfcpp::R_X86_64_DTPOFF32: | |
2184 | case elfcpp::R_X86_64_DTPOFF64: | |
2185 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2186 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2187 | return Symbol::TLS_REF; | |
2188 | ||
2189 | case elfcpp::R_X86_64_COPY: | |
2190 | case elfcpp::R_X86_64_GLOB_DAT: | |
2191 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2192 | case elfcpp::R_X86_64_RELATIVE: | |
2193 | case elfcpp::R_X86_64_IRELATIVE: | |
2194 | case elfcpp::R_X86_64_TPOFF64: | |
2195 | case elfcpp::R_X86_64_DTPMOD64: | |
2196 | case elfcpp::R_X86_64_TLSDESC: | |
2197 | case elfcpp::R_X86_64_SIZE32: | |
2198 | case elfcpp::R_X86_64_SIZE64: | |
2199 | default: | |
2200 | // Not expected. We will give an error later. | |
2201 | return 0; | |
2202 | } | |
2203 | } | |
2204 | ||
e041f13d ILT |
2205 | // Report an unsupported relocation against a local symbol. |
2206 | ||
fc51264f | 2207 | template<int size> |
e041f13d | 2208 | void |
fc51264f L |
2209 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
2210 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2211 | unsigned int r_type) |
e041f13d | 2212 | { |
75f2446e ILT |
2213 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2214 | object->name().c_str(), r_type); | |
e041f13d ILT |
2215 | } |
2216 | ||
a036edd8 ILT |
2217 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
2218 | // dynamic linker does not support it, issue an error. The GNU linker | |
2219 | // only issues a non-PIC error for an allocated read-only section. | |
2220 | // Here we know the section is allocated, but we don't know that it is | |
2221 | // read-only. But we check for all the relocation types which the | |
2222 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
2223 | // error even if the section is not read-only. If GSYM is not NULL, |
2224 | // it is the symbol the relocation is against; if it is NULL, the | |
2225 | // relocation is against a local symbol. | |
a036edd8 | 2226 | |
fc51264f | 2227 | template<int size> |
a036edd8 | 2228 | void |
fc51264f L |
2229 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
2230 | Symbol* gsym) | |
a036edd8 ILT |
2231 | { |
2232 | switch (r_type) | |
2233 | { | |
2fbb4320 ILT |
2234 | // These are the relocation types supported by glibc for x86_64 |
2235 | // which should always work. | |
a036edd8 | 2236 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 2237 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
2238 | case elfcpp::R_X86_64_GLOB_DAT: |
2239 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2240 | case elfcpp::R_X86_64_DTPMOD64: | |
2241 | case elfcpp::R_X86_64_DTPOFF64: | |
2242 | case elfcpp::R_X86_64_TPOFF64: | |
2243 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
2244 | case elfcpp::R_X86_64_COPY: |
2245 | return; | |
2246 | ||
2247 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 2248 | case elfcpp::R_X86_64_PC32: |
f49fe902 | 2249 | case elfcpp::R_X86_64_PC32_BND: |
a29b0dad ILT |
2250 | // A PC relative reference is OK against a local symbol or if |
2251 | // the symbol is defined locally. | |
2252 | if (gsym == NULL | |
2253 | || (!gsym->is_from_dynobj() | |
2254 | && !gsym->is_undefined() | |
2255 | && !gsym->is_preemptible())) | |
2256 | return; | |
2257 | /* Fall through. */ | |
2258 | case elfcpp::R_X86_64_32: | |
3660ff06 L |
2259 | // R_X86_64_32 is OK for x32. |
2260 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2261 | return; | |
2fbb4320 ILT |
2262 | if (this->issued_non_pic_error_) |
2263 | return; | |
2264 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
2265 | if (gsym == NULL) |
2266 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
2267 | "overflow at runtime; recompile with -fPIC")); | |
2268 | else | |
f49fe902 L |
2269 | { |
2270 | const char *r_name; | |
2271 | switch (r_type) | |
2272 | { | |
2273 | case elfcpp::R_X86_64_32: | |
2274 | r_name = "R_X86_64_32"; | |
2275 | break; | |
2276 | case elfcpp::R_X86_64_PC32: | |
2277 | r_name = "R_X86_64_PC32"; | |
2278 | break; | |
2279 | case elfcpp::R_X86_64_PC32_BND: | |
2280 | r_name = "R_X86_64_PC32_BND"; | |
2281 | break; | |
2282 | default: | |
2283 | gold_unreachable(); | |
2284 | break; | |
2285 | } | |
2286 | object->error(_("requires dynamic %s reloc against '%s' " | |
2287 | "which may overflow at runtime; recompile " | |
2288 | "with -fPIC"), | |
2289 | r_name, gsym->name()); | |
2290 | } | |
2fbb4320 | 2291 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
2292 | return; |
2293 | ||
2294 | default: | |
2295 | // This prevents us from issuing more than one error per reloc | |
2296 | // section. But we can still wind up issuing more than one | |
2297 | // error per object file. | |
2298 | if (this->issued_non_pic_error_) | |
2e702c99 | 2299 | return; |
33aea2fd | 2300 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad | 2301 | object->error(_("requires unsupported dynamic reloc %u; " |
2e702c99 | 2302 | "recompile with -fPIC"), |
a29b0dad | 2303 | r_type); |
a036edd8 ILT |
2304 | this->issued_non_pic_error_ = true; |
2305 | return; | |
2306 | ||
2307 | case elfcpp::R_X86_64_NONE: | |
2308 | gold_unreachable(); | |
2309 | } | |
2310 | } | |
2311 | ||
7223e9ca ILT |
2312 | // Return whether we need to make a PLT entry for a relocation of the |
2313 | // given type against a STT_GNU_IFUNC symbol. | |
2314 | ||
fc51264f | 2315 | template<int size> |
7223e9ca | 2316 | bool |
fc51264f L |
2317 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
2318 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2319 | unsigned int r_type) |
7223e9ca | 2320 | { |
95a2c8d6 RS |
2321 | int flags = Scan::get_reference_flags(r_type); |
2322 | if (flags & Symbol::TLS_REF) | |
2323 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 2324 | object->name().c_str(), r_type); |
95a2c8d6 | 2325 | return flags != 0; |
7223e9ca ILT |
2326 | } |
2327 | ||
2e30d253 ILT |
2328 | // Scan a relocation for a local symbol. |
2329 | ||
fc51264f | 2330 | template<int size> |
2e30d253 | 2331 | inline void |
fc51264f L |
2332 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
2333 | Layout* layout, | |
2334 | Target_x86_64<size>* target, | |
2335 | Sized_relobj_file<size, false>* object, | |
2336 | unsigned int data_shndx, | |
2337 | Output_section* output_section, | |
2338 | const elfcpp::Rela<size, false>& reloc, | |
2339 | unsigned int r_type, | |
bfdfa4cd AM |
2340 | const elfcpp::Sym<size, false>& lsym, |
2341 | bool is_discarded) | |
2e30d253 | 2342 | { |
bfdfa4cd AM |
2343 | if (is_discarded) |
2344 | return; | |
2345 | ||
7223e9ca | 2346 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
2347 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
2348 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 2349 | { |
fc51264f | 2350 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2351 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
2352 | } | |
2353 | ||
2e30d253 ILT |
2354 | switch (r_type) |
2355 | { | |
2356 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2357 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2358 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2359 | break; |
2360 | ||
2361 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 2362 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2363 | // executable), we need to create a dynamic relocation for this |
2364 | // location. The relocation applied at link time will apply the | |
2365 | // link-time value, so we flag the location with an | |
2366 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 2367 | // relocate it easily. |
8851ecca | 2368 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
2369 | { |
2370 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2371 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca | 2372 | rela_dyn->add_local_relative(object, r_sym, |
62fe925a | 2373 | (size == 32 |
fd885f3a L |
2374 | ? elfcpp::R_X86_64_RELATIVE64 |
2375 | : elfcpp::R_X86_64_RELATIVE), | |
7223e9ca ILT |
2376 | output_section, data_shndx, |
2377 | reloc.get_r_offset(), | |
397b129b | 2378 | reloc.get_r_addend(), is_ifunc); |
2e702c99 | 2379 | } |
d61c6bd4 ILT |
2380 | break; |
2381 | ||
2e30d253 ILT |
2382 | case elfcpp::R_X86_64_32: |
2383 | case elfcpp::R_X86_64_32S: | |
2384 | case elfcpp::R_X86_64_16: | |
2385 | case elfcpp::R_X86_64_8: | |
96f2030e | 2386 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2387 | // executable), we need to create a dynamic relocation for this |
2388 | // location. We can't use an R_X86_64_RELATIVE relocation | |
2389 | // because that is always a 64-bit relocation. | |
8851ecca | 2390 | if (parameters->options().output_is_position_independent()) |
2e702c99 | 2391 | { |
3660ff06 L |
2392 | // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32. |
2393 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2394 | { | |
2395 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2396 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2397 | rela_dyn->add_local_relative(object, r_sym, | |
2398 | elfcpp::R_X86_64_RELATIVE, | |
2399 | output_section, data_shndx, | |
2400 | reloc.get_r_offset(), | |
2401 | reloc.get_r_addend(), is_ifunc); | |
2402 | break; | |
2403 | } | |
2404 | ||
2e702c99 | 2405 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 2406 | |
2e702c99 | 2407 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 2408 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
2e702c99 | 2409 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
2410 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
2411 | data_shndx, reloc.get_r_offset(), | |
2412 | reloc.get_r_addend()); | |
2e702c99 RM |
2413 | else |
2414 | { | |
2415 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
2416 | unsigned int shndx = lsym.get_st_shndx(); |
2417 | bool is_ordinary; | |
2418 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
2419 | &is_ordinary); | |
2420 | if (!is_ordinary) | |
2421 | object->error(_("section symbol %u has bad shndx %u"), | |
2422 | r_sym, shndx); | |
2423 | else | |
2424 | rela_dyn->add_local_section(object, shndx, | |
2425 | r_type, output_section, | |
2426 | data_shndx, reloc.get_r_offset(), | |
2427 | reloc.get_r_addend()); | |
2e702c99 RM |
2428 | } |
2429 | } | |
2e30d253 ILT |
2430 | break; |
2431 | ||
2432 | case elfcpp::R_X86_64_PC64: | |
2433 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2434 | case elfcpp::R_X86_64_PC32_BND: |
2e30d253 ILT |
2435 | case elfcpp::R_X86_64_PC16: |
2436 | case elfcpp::R_X86_64_PC8: | |
2437 | break; | |
2438 | ||
f389a824 | 2439 | case elfcpp::R_X86_64_PLT32: |
f49fe902 | 2440 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 ILT |
2441 | // Since we know this is a local symbol, we can handle this as a |
2442 | // PC32 reloc. | |
2443 | break; | |
2444 | ||
fdc2f80f | 2445 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2446 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2447 | case elfcpp::R_X86_64_GOTPC64: |
2448 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2449 | // We need a GOT section. |
2450 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2451 | // For PLTOFF64, we'd normally want a PLT section, but since we |
2452 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
2453 | break; |
2454 | ||
0ffd9845 ILT |
2455 | case elfcpp::R_X86_64_GOT64: |
2456 | case elfcpp::R_X86_64_GOT32: | |
2457 | case elfcpp::R_X86_64_GOTPCREL64: | |
2458 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 2459 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 2460 | { |
2e702c99 RM |
2461 | // The symbol requires a GOT entry. |
2462 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
2463 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
7223e9ca ILT |
2464 | |
2465 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
2466 | // lets function pointers compare correctly with shared | |
2467 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
2468 | bool is_new; | |
397b129b | 2469 | if (is_ifunc) |
7223e9ca ILT |
2470 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
2471 | else | |
2472 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
2473 | if (is_new) |
2474 | { | |
2475 | // If we are generating a shared object, we need to add a | |
2476 | // dynamic relocation for this symbol's GOT entry. | |
2477 | if (parameters->options().output_is_position_independent()) | |
2478 | { | |
2479 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
2480 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
2481 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
2482 | { |
2483 | unsigned int got_offset = | |
2484 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
2485 | rela_dyn->add_local_relative(object, r_sym, | |
2486 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2487 | got, got_offset, 0, is_ifunc); |
7223e9ca | 2488 | } |
2e702c99 RM |
2489 | else |
2490 | { | |
2491 | this->check_non_pic(object, r_type, NULL); | |
2492 | ||
2493 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2494 | rela_dyn->add_local( | |
2495 | object, r_sym, r_type, got, | |
2496 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
2497 | } | |
2498 | } | |
2499 | } | |
2500 | // For GOTPLT64, we'd normally want a PLT section, but since | |
2501 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
2502 | } |
2503 | break; | |
2504 | ||
2e30d253 ILT |
2505 | case elfcpp::R_X86_64_COPY: |
2506 | case elfcpp::R_X86_64_GLOB_DAT: | |
2507 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2508 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2509 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2510 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2511 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2512 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2513 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2514 | gold_error(_("%s: unexpected reloc %u in object file"), |
2515 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2516 | break; |
2517 | ||
d61c17ea | 2518 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2519 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2520 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2521 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2522 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2523 | case elfcpp::R_X86_64_DTPOFF32: |
2524 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2525 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2526 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 2527 | { |
8851ecca | 2528 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 2529 | const tls::Tls_optimization optimized_type |
2e702c99 | 2530 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
fc51264f | 2531 | r_type); |
2e30d253 ILT |
2532 | switch (r_type) |
2533 | { | |
2e702c99 RM |
2534 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
2535 | if (optimized_type == tls::TLSOPT_NONE) | |
2536 | { | |
2537 | // Create a pair of GOT entries for the module index and | |
2538 | // dtv-relative offset. | |
2539 | Output_data_got<64, false>* got | |
2540 | = target->got_section(symtab, layout); | |
2541 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
d491d34e ILT |
2542 | unsigned int shndx = lsym.get_st_shndx(); |
2543 | bool is_ordinary; | |
2544 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
2545 | if (!is_ordinary) | |
2546 | object->error(_("local symbol %u has bad shndx %u"), | |
2547 | r_sym, shndx); | |
2e702c99 | 2548 | else |
83896202 ILT |
2549 | got->add_local_pair_with_rel(object, r_sym, |
2550 | shndx, | |
2551 | GOT_TYPE_TLS_PAIR, | |
2552 | target->rela_dyn_section(layout), | |
bd73a62d | 2553 | elfcpp::R_X86_64_DTPMOD64); |
2e702c99 RM |
2554 | } |
2555 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2556 | unsupported_reloc_local(object, r_type); |
2e702c99 | 2557 | break; |
7bf1f802 | 2558 | |
2e702c99 RM |
2559 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2560 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
2561 | if (optimized_type == tls::TLSOPT_NONE) |
2562 | { | |
2e702c99 RM |
2563 | // Create reserved PLT and GOT entries for the resolver. |
2564 | target->reserve_tlsdesc_entries(symtab, layout); | |
2565 | ||
2566 | // Generate a double GOT entry with an | |
2567 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
2568 | // is resolved lazily, so the GOT entry needs to be in | |
2569 | // an area in .got.plt, not .got. Call got_section to | |
2570 | // make sure the section has been created. | |
a8df5856 | 2571 | target->got_section(symtab, layout); |
2e702c99 RM |
2572 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
2573 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
e291e7b9 ILT |
2574 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
2575 | { | |
2576 | unsigned int got_offset = got->add_constant(0); | |
2577 | got->add_constant(0); | |
2578 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
2579 | got_offset); | |
2580 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
2581 | // We store the arguments we need in a vector, and | |
2582 | // use the index into the vector as the parameter | |
2583 | // to pass to the target specific routines. | |
2584 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
2585 | void* arg = reinterpret_cast<void*>(intarg); | |
2586 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2587 | got, got_offset, 0); | |
2588 | } | |
c2b45e22 CC |
2589 | } |
2590 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2591 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
2592 | break; |
2593 | ||
2e702c99 | 2594 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
2595 | break; |
2596 | ||
2e702c99 | 2597 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2598 | if (optimized_type == tls::TLSOPT_NONE) |
2599 | { | |
2e702c99 RM |
2600 | // Create a GOT entry for the module index. |
2601 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
2602 | } |
2603 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2604 | unsupported_reloc_local(object, r_type); | |
2605 | break; | |
2606 | ||
2e702c99 RM |
2607 | case elfcpp::R_X86_64_DTPOFF32: |
2608 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2609 | break; |
2610 | ||
2e702c99 | 2611 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2612 | layout->set_has_static_tls(); |
2e702c99 RM |
2613 | if (optimized_type == tls::TLSOPT_NONE) |
2614 | { | |
2615 | // Create a GOT entry for the tp-relative offset. | |
2616 | Output_data_got<64, false>* got | |
2617 | = target->got_section(symtab, layout); | |
2618 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2619 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2620 | target->rela_dyn_section(layout), |
2621 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
2622 | } |
2623 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2624 | unsupported_reloc_local(object, r_type); | |
2625 | break; | |
0ffd9845 | 2626 | |
2e702c99 | 2627 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2628 | layout->set_has_static_tls(); |
2e702c99 RM |
2629 | if (output_is_shared) |
2630 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 2631 | break; |
e041f13d | 2632 | |
2e702c99 RM |
2633 | default: |
2634 | gold_unreachable(); | |
2e30d253 ILT |
2635 | } |
2636 | } | |
2637 | break; | |
2e30d253 | 2638 | |
fdc2f80f ILT |
2639 | case elfcpp::R_X86_64_SIZE32: |
2640 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2641 | default: |
75f2446e ILT |
2642 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2643 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2644 | break; |
2645 | } | |
2646 | } | |
2647 | ||
2648 | ||
e041f13d ILT |
2649 | // Report an unsupported relocation against a global symbol. |
2650 | ||
fc51264f | 2651 | template<int size> |
e041f13d | 2652 | void |
fc51264f L |
2653 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
2654 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
2655 | unsigned int r_type, |
2656 | Symbol* gsym) | |
e041f13d | 2657 | { |
75f2446e | 2658 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2659 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
2660 | } |
2661 | ||
ce97fa81 | 2662 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 2663 | template<int size> |
21bb3914 | 2664 | inline bool |
fc51264f | 2665 | Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type) |
21bb3914 | 2666 | { |
21bb3914 ST |
2667 | switch (r_type) |
2668 | { | |
2669 | case elfcpp::R_X86_64_64: | |
2670 | case elfcpp::R_X86_64_32: | |
2671 | case elfcpp::R_X86_64_32S: | |
2672 | case elfcpp::R_X86_64_16: | |
2673 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
2674 | case elfcpp::R_X86_64_GOT64: |
2675 | case elfcpp::R_X86_64_GOT32: | |
2676 | case elfcpp::R_X86_64_GOTPCREL64: | |
2677 | case elfcpp::R_X86_64_GOTPCREL: | |
2678 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 | 2679 | { |
2e702c99 | 2680 | return true; |
21bb3914 ST |
2681 | } |
2682 | } | |
2683 | return false; | |
2684 | } | |
2685 | ||
2686 | // For safe ICF, scan a relocation for a local symbol to check if it | |
2687 | // corresponds to a function pointer being taken. In that case mark | |
2688 | // the function whose pointer was taken as not foldable. | |
2689 | ||
fc51264f | 2690 | template<int size> |
21bb3914 | 2691 | inline bool |
fc51264f | 2692 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
2693 | Symbol_table* , |
2694 | Layout* , | |
fc51264f L |
2695 | Target_x86_64<size>* , |
2696 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2697 | unsigned int , |
2698 | Output_section* , | |
fc51264f | 2699 | const elfcpp::Rela<size, false>& , |
21bb3914 | 2700 | unsigned int r_type, |
fc51264f | 2701 | const elfcpp::Sym<size, false>&) |
21bb3914 ST |
2702 | { |
2703 | // When building a shared library, do not fold any local symbols as it is | |
2704 | // not possible to distinguish pointer taken versus a call by looking at | |
2705 | // the relocation types. | |
2706 | return (parameters->options().shared() | |
2e702c99 | 2707 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2708 | } |
2709 | ||
2710 | // For safe ICF, scan a relocation for a global symbol to check if it | |
2711 | // corresponds to a function pointer being taken. In that case mark | |
2712 | // the function whose pointer was taken as not foldable. | |
2713 | ||
fc51264f | 2714 | template<int size> |
21bb3914 | 2715 | inline bool |
fc51264f | 2716 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
2717 | Symbol_table*, |
2718 | Layout* , | |
fc51264f L |
2719 | Target_x86_64<size>* , |
2720 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2721 | unsigned int , |
2722 | Output_section* , | |
fc51264f | 2723 | const elfcpp::Rela<size, false>& , |
21bb3914 ST |
2724 | unsigned int r_type, |
2725 | Symbol* gsym) | |
2726 | { | |
2727 | // When building a shared library, do not fold symbols whose visibility | |
2728 | // is hidden, internal or protected. | |
2729 | return ((parameters->options().shared() | |
2e702c99 | 2730 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
21bb3914 ST |
2731 | || gsym->visibility() == elfcpp::STV_PROTECTED |
2732 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
2e702c99 | 2733 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2734 | } |
2735 | ||
2e30d253 ILT |
2736 | // Scan a relocation for a global symbol. |
2737 | ||
fc51264f | 2738 | template<int size> |
2e30d253 | 2739 | inline void |
fc51264f | 2740 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2741 | Layout* layout, |
2742 | Target_x86_64<size>* target, | |
2743 | Sized_relobj_file<size, false>* object, | |
2744 | unsigned int data_shndx, | |
2745 | Output_section* output_section, | |
2746 | const elfcpp::Rela<size, false>& reloc, | |
2747 | unsigned int r_type, | |
2748 | Symbol* gsym) | |
2e30d253 | 2749 | { |
7223e9ca ILT |
2750 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2751 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2752 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2753 | target->make_plt_entry(symtab, layout, gsym); | |
2754 | ||
2e30d253 ILT |
2755 | switch (r_type) |
2756 | { | |
2757 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2758 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2759 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2760 | break; |
2761 | ||
2762 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
2763 | case elfcpp::R_X86_64_32: |
2764 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 2765 | case elfcpp::R_X86_64_16: |
2e30d253 | 2766 | case elfcpp::R_X86_64_8: |
96f2030e | 2767 | { |
2e702c99 RM |
2768 | // Make a PLT entry if necessary. |
2769 | if (gsym->needs_plt_entry()) | |
2770 | { | |
2771 | target->make_plt_entry(symtab, layout, gsym); | |
2772 | // Since this is not a PC-relative relocation, we may be | |
2773 | // taking the address of a function. In that case we need to | |
2774 | // set the entry in the dynamic symbol table to the address of | |
2775 | // the PLT entry. | |
2776 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2777 | gsym->set_needs_dynsym_value(); | |
2778 | } | |
2779 | // Make a dynamic relocation if necessary. | |
2780 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2781 | { | |
a82bef93 ST |
2782 | if (!parameters->options().output_is_position_independent() |
2783 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2784 | { |
2785 | target->copy_reloc(symtab, layout, object, | |
2786 | data_shndx, output_section, gsym, reloc); | |
2787 | } | |
1bae613c L |
2788 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2789 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
7223e9ca ILT |
2790 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2791 | && gsym->can_use_relative_reloc(false) | |
2792 | && !gsym->is_from_dynobj() | |
2793 | && !gsym->is_undefined() | |
2794 | && !gsym->is_preemptible()) | |
2795 | { | |
2796 | // Use an IRELATIVE reloc for a locally defined | |
2797 | // STT_GNU_IFUNC symbol. This makes a function | |
2798 | // address in a PIE executable match the address in a | |
2799 | // shared library that it links against. | |
67181c72 ILT |
2800 | Reloc_section* rela_dyn = |
2801 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
2802 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
2803 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
2804 | output_section, object, | |
2805 | data_shndx, | |
2806 | reloc.get_r_offset(), | |
2807 | reloc.get_r_addend()); | |
2808 | } | |
b14016f0 L |
2809 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2810 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
2e702c99 RM |
2811 | && gsym->can_use_relative_reloc(false)) |
2812 | { | |
2813 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2814 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
2815 | output_section, object, | |
2816 | data_shndx, | |
2817 | reloc.get_r_offset(), | |
13cf9988 | 2818 | reloc.get_r_addend(), false); |
2e702c99 RM |
2819 | } |
2820 | else | |
2821 | { | |
2822 | this->check_non_pic(object, r_type, gsym); | |
2823 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2824 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2825 | data_shndx, reloc.get_r_offset(), | |
2826 | reloc.get_r_addend()); | |
2827 | } | |
2828 | } | |
d61c6bd4 ILT |
2829 | } |
2830 | break; | |
2831 | ||
2832 | case elfcpp::R_X86_64_PC64: | |
2833 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2834 | case elfcpp::R_X86_64_PC32_BND: |
d61c6bd4 ILT |
2835 | case elfcpp::R_X86_64_PC16: |
2836 | case elfcpp::R_X86_64_PC8: | |
2837 | { | |
2e702c99 RM |
2838 | // Make a PLT entry if necessary. |
2839 | if (gsym->needs_plt_entry()) | |
2840 | target->make_plt_entry(symtab, layout, gsym); | |
2841 | // Make a dynamic relocation if necessary. | |
2842 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2843 | { | |
a82bef93 ST |
2844 | if (parameters->options().output_is_executable() |
2845 | && gsym->may_need_copy_reloc()) | |
2e702c99 RM |
2846 | { |
2847 | target->copy_reloc(symtab, layout, object, | |
2848 | data_shndx, output_section, gsym, reloc); | |
2849 | } | |
2850 | else | |
2851 | { | |
2852 | this->check_non_pic(object, r_type, gsym); | |
2853 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2854 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2855 | data_shndx, reloc.get_r_offset(), | |
2856 | reloc.get_r_addend()); | |
2857 | } | |
2858 | } | |
d61c6bd4 | 2859 | } |
2e30d253 ILT |
2860 | break; |
2861 | ||
ff006520 | 2862 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 2863 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
2864 | case elfcpp::R_X86_64_GOTPCREL64: |
2865 | case elfcpp::R_X86_64_GOTPCREL: | |
2866 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 | 2867 | { |
2e702c99 RM |
2868 | // The symbol requires a GOT entry. |
2869 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
2870 | if (gsym->final_value_is_known()) | |
7223e9ca ILT |
2871 | { |
2872 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2873 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2874 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2875 | else | |
2876 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2877 | } | |
2e702c99 RM |
2878 | else |
2879 | { | |
2880 | // If this symbol is not fully resolved, we need to add a | |
2881 | // dynamic relocation for it. | |
2882 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
07aa62f2 ILT |
2883 | |
2884 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2885 | // | |
2886 | // 1) The symbol may be defined in some other module. | |
2887 | // | |
2888 | // 2) We are building a shared library and this is a | |
2889 | // protected symbol; using GLOB_DAT means that the dynamic | |
2890 | // linker can use the address of the PLT in the main | |
2891 | // executable when appropriate so that function address | |
2892 | // comparisons work. | |
2893 | // | |
2894 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2895 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
2896 | if (gsym->is_from_dynobj() |
2897 | || gsym->is_undefined() | |
2898 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2899 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2900 | && parameters->options().shared()) | |
7223e9ca ILT |
2901 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2902 | && parameters->options().output_is_position_independent())) | |
2e702c99 | 2903 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
83896202 | 2904 | elfcpp::R_X86_64_GLOB_DAT); |
2e702c99 RM |
2905 | else |
2906 | { | |
7223e9ca ILT |
2907 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2908 | // offset into the GOT, so that function pointer | |
2909 | // comparisons work correctly. | |
2910 | bool is_new; | |
2911 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2912 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2913 | else | |
2914 | { | |
2915 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2916 | // Tell the dynamic linker to use the PLT address | |
2917 | // when resolving relocations. | |
2918 | if (gsym->is_from_dynobj() | |
2919 | && !parameters->options().shared()) | |
2920 | gsym->set_needs_dynsym_value(); | |
2921 | } | |
2e702c99 | 2922 | if (is_new) |
7223e9ca ILT |
2923 | { |
2924 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2925 | rela_dyn->add_global_relative(gsym, | |
2926 | elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 2927 | got, got_off, 0, false); |
7223e9ca | 2928 | } |
2e702c99 RM |
2929 | } |
2930 | } | |
2e30d253 ILT |
2931 | } |
2932 | break; | |
2933 | ||
2934 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 2935 | case elfcpp::R_X86_64_PLT32_BND: |
2e30d253 ILT |
2936 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2937 | // Otherwise we need a PLT entry. | |
2938 | if (gsym->final_value_is_known()) | |
2939 | break; | |
96f2030e ILT |
2940 | // If building a shared library, we can also skip the PLT entry |
2941 | // if the symbol is defined in the output file and is protected | |
2942 | // or hidden. | |
2943 | if (gsym->is_defined() | |
2e702c99 RM |
2944 | && !gsym->is_from_dynobj() |
2945 | && !gsym->is_preemptible()) | |
96f2030e | 2946 | break; |
2e30d253 ILT |
2947 | target->make_plt_entry(symtab, layout, gsym); |
2948 | break; | |
2949 | ||
fdc2f80f | 2950 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2951 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2952 | case elfcpp::R_X86_64_GOTPC64: |
2953 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2954 | // We need a GOT section. |
2955 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2956 | // For PLTOFF64, we also need a PLT entry (but only if the |
2957 | // symbol is not fully resolved). | |
2958 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
2959 | && !gsym->final_value_is_known()) | |
2960 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2961 | break; |
2962 | ||
2e30d253 ILT |
2963 | case elfcpp::R_X86_64_COPY: |
2964 | case elfcpp::R_X86_64_GLOB_DAT: | |
2965 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2966 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2967 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2968 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 2969 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2970 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 2971 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2972 | gold_error(_("%s: unexpected reloc %u in object file"), |
2973 | object->name().c_str(), r_type); | |
2e30d253 | 2974 | break; |
2e30d253 | 2975 | |
d61c17ea | 2976 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
2977 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2978 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2979 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2980 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2981 | case elfcpp::R_X86_64_DTPOFF32: |
2982 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2983 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2984 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 2985 | { |
65d92137 CC |
2986 | // For the Initial-Exec model, we can treat undef symbols as final |
2987 | // when building an executable. | |
2988 | const bool is_final = (gsym->final_value_is_known() || | |
2989 | (r_type == elfcpp::R_X86_64_GOTTPOFF && | |
2990 | gsym->is_undefined() && | |
2991 | parameters->options().output_is_executable())); | |
e041f13d | 2992 | const tls::Tls_optimization optimized_type |
2e702c99 | 2993 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2994 | switch (r_type) |
2995 | { | |
2e702c99 | 2996 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
2997 | if (optimized_type == tls::TLSOPT_NONE) |
2998 | { | |
2e702c99 RM |
2999 | // Create a pair of GOT entries for the module index and |
3000 | // dtv-relative offset. | |
3001 | Output_data_got<64, false>* got | |
3002 | = target->got_section(symtab, layout); | |
3003 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
83896202 ILT |
3004 | target->rela_dyn_section(layout), |
3005 | elfcpp::R_X86_64_DTPMOD64, | |
3006 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
3007 | } |
3008 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3009 | { | |
2e702c99 RM |
3010 | // Create a GOT entry for the tp-relative offset. |
3011 | Output_data_got<64, false>* got | |
3012 | = target->got_section(symtab, layout); | |
3013 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3014 | target->rela_dyn_section(layout), |
3015 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
3016 | } |
3017 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3018 | unsupported_reloc_global(object, r_type, gsym); | |
3019 | break; | |
3020 | ||
2e702c99 RM |
3021 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
3022 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
3023 | if (optimized_type == tls::TLSOPT_NONE) |
3024 | { | |
2e702c99 RM |
3025 | // Create reserved PLT and GOT entries for the resolver. |
3026 | target->reserve_tlsdesc_entries(symtab, layout); | |
3027 | ||
3028 | // Create a double GOT entry with an R_X86_64_TLSDESC | |
3029 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
3030 | // lazily, so the GOT entry needs to be in an area in | |
3031 | // .got.plt, not .got. Call got_section to make sure | |
3032 | // the section has been created. | |
a8df5856 | 3033 | target->got_section(symtab, layout); |
2e702c99 | 3034 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
ca09d69a | 3035 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
2e702c99 | 3036 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
83896202 | 3037 | elfcpp::R_X86_64_TLSDESC, 0); |
c2b45e22 CC |
3038 | } |
3039 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
3040 | { | |
2e702c99 RM |
3041 | // Create a GOT entry for the tp-relative offset. |
3042 | Output_data_got<64, false>* got | |
3043 | = target->got_section(symtab, layout); | |
3044 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3045 | target->rela_dyn_section(layout), |
3046 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
3047 | } |
3048 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3049 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
3050 | break; |
3051 | ||
2e702c99 | 3052 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3053 | break; |
3054 | ||
2e702c99 | 3055 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3056 | if (optimized_type == tls::TLSOPT_NONE) |
3057 | { | |
2e702c99 RM |
3058 | // Create a GOT entry for the module index. |
3059 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3060 | } |
3061 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3062 | unsupported_reloc_global(object, r_type, gsym); | |
3063 | break; | |
3064 | ||
2e702c99 RM |
3065 | case elfcpp::R_X86_64_DTPOFF32: |
3066 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3067 | break; |
3068 | ||
2e702c99 | 3069 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3070 | layout->set_has_static_tls(); |
2e702c99 RM |
3071 | if (optimized_type == tls::TLSOPT_NONE) |
3072 | { | |
3073 | // Create a GOT entry for the tp-relative offset. | |
3074 | Output_data_got<64, false>* got | |
3075 | = target->got_section(symtab, layout); | |
3076 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3077 | target->rela_dyn_section(layout), |
3078 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3079 | } |
3080 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3081 | unsupported_reloc_global(object, r_type, gsym); | |
3082 | break; | |
0ffd9845 | 3083 | |
2e702c99 | 3084 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3085 | layout->set_has_static_tls(); |
2e702c99 | 3086 | if (parameters->options().shared()) |
b1759dce | 3087 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 | 3088 | break; |
e041f13d | 3089 | |
2e702c99 RM |
3090 | default: |
3091 | gold_unreachable(); | |
2e30d253 ILT |
3092 | } |
3093 | } | |
3094 | break; | |
fdc2f80f ILT |
3095 | |
3096 | case elfcpp::R_X86_64_SIZE32: | |
3097 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3098 | default: |
75f2446e | 3099 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3100 | object->name().c_str(), r_type, |
2e702c99 | 3101 | gsym->demangled_name().c_str()); |
2e30d253 ILT |
3102 | break; |
3103 | } | |
3104 | } | |
3105 | ||
fc51264f | 3106 | template<int size> |
6d03d481 | 3107 | void |
fc51264f L |
3108 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
3109 | Layout* layout, | |
3110 | Sized_relobj_file<size, false>* object, | |
3111 | unsigned int data_shndx, | |
3112 | unsigned int sh_type, | |
3113 | const unsigned char* prelocs, | |
3114 | size_t reloc_count, | |
3115 | Output_section* output_section, | |
3116 | bool needs_special_offset_handling, | |
3117 | size_t local_symbol_count, | |
3118 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
3119 | { |
3120 | ||
3121 | if (sh_type == elfcpp::SHT_REL) | |
3122 | { | |
3123 | return; | |
3124 | } | |
3125 | ||
fc51264f | 3126 | gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
2e702c99 | 3127 | typename Target_x86_64<size>::Scan, |
618d6666 | 3128 | typename Target_x86_64<size>::Relocatable_size_for_reloc>( |
6d03d481 ST |
3129 | symtab, |
3130 | layout, | |
3131 | this, | |
3132 | object, | |
3133 | data_shndx, | |
3134 | prelocs, | |
3135 | reloc_count, | |
3136 | output_section, | |
3137 | needs_special_offset_handling, | |
3138 | local_symbol_count, | |
3139 | plocal_symbols); | |
2e702c99 | 3140 | |
6d03d481 | 3141 | } |
2e30d253 ILT |
3142 | // Scan relocations for a section. |
3143 | ||
fc51264f | 3144 | template<int size> |
2e30d253 | 3145 | void |
fc51264f L |
3146 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
3147 | Layout* layout, | |
3148 | Sized_relobj_file<size, false>* object, | |
3149 | unsigned int data_shndx, | |
3150 | unsigned int sh_type, | |
3151 | const unsigned char* prelocs, | |
3152 | size_t reloc_count, | |
3153 | Output_section* output_section, | |
3154 | bool needs_special_offset_handling, | |
3155 | size_t local_symbol_count, | |
3156 | const unsigned char* plocal_symbols) | |
2e30d253 ILT |
3157 | { |
3158 | if (sh_type == elfcpp::SHT_REL) | |
3159 | { | |
75f2446e ILT |
3160 | gold_error(_("%s: unsupported REL reloc section"), |
3161 | object->name().c_str()); | |
3162 | return; | |
2e30d253 ILT |
3163 | } |
3164 | ||
fc51264f | 3165 | gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
618d6666 | 3166 | typename Target_x86_64<size>::Scan>( |
2e30d253 ILT |
3167 | symtab, |
3168 | layout, | |
3169 | this, | |
3170 | object, | |
3171 | data_shndx, | |
3172 | prelocs, | |
3173 | reloc_count, | |
730cdc88 ILT |
3174 | output_section, |
3175 | needs_special_offset_handling, | |
2e30d253 | 3176 | local_symbol_count, |
730cdc88 | 3177 | plocal_symbols); |
2e30d253 ILT |
3178 | } |
3179 | ||
3180 | // Finalize the sections. | |
3181 | ||
fc51264f | 3182 | template<int size> |
2e30d253 | 3183 | void |
fc51264f | 3184 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
3185 | Layout* layout, |
3186 | const Input_objects*, | |
e785ec03 | 3187 | Symbol_table* symtab) |
2e30d253 | 3188 | { |
ea715a34 ILT |
3189 | const Reloc_section* rel_plt = (this->plt_ == NULL |
3190 | ? NULL | |
e291e7b9 | 3191 | : this->plt_->rela_plt()); |
ea715a34 | 3192 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 3193 | this->rela_dyn_, true, false); |
2e702c99 | 3194 | |
2e30d253 ILT |
3195 | // Fill in some more dynamic tags. |
3196 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
3197 | if (odyn != NULL) | |
3198 | { | |
22b127cc | 3199 | if (this->plt_ != NULL |
ea715a34 ILT |
3200 | && this->plt_->output_section() != NULL |
3201 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 3202 | { |
ea715a34 ILT |
3203 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
3204 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
3205 | this->got_->finalize_data_size(); | |
3206 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
3207 | this->plt_, plt_offset); | |
3208 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
3209 | this->got_, got_offset); | |
2e30d253 ILT |
3210 | } |
3211 | } | |
3212 | ||
3213 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
3214 | // relocs. | |
12c0daef ILT |
3215 | if (this->copy_relocs_.any_saved_relocs()) |
3216 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
3217 | |
3218 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
3219 | // the .got.plt section. | |
3220 | Symbol* sym = this->global_offset_table_; | |
3221 | if (sym != NULL) | |
3222 | { | |
3223 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 3224 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 3225 | } |
28a13fec | 3226 | |
67181c72 ILT |
3227 | if (parameters->doing_static_link() |
3228 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
3229 | { |
3230 | // If linking statically, make sure that the __rela_iplt symbols | |
3231 | // were defined if necessary, even if we didn't create a PLT. | |
3232 | static const Define_symbol_in_segment syms[] = | |
3233 | { | |
3234 | { | |
3235 | "__rela_iplt_start", // name | |
3236 | elfcpp::PT_LOAD, // segment_type | |
3237 | elfcpp::PF_W, // segment_flags_set | |
3238 | elfcpp::PF(0), // segment_flags_clear | |
3239 | 0, // value | |
3240 | 0, // size | |
3241 | elfcpp::STT_NOTYPE, // type | |
3242 | elfcpp::STB_GLOBAL, // binding | |
3243 | elfcpp::STV_HIDDEN, // visibility | |
3244 | 0, // nonvis | |
3245 | Symbol::SEGMENT_START, // offset_from_base | |
3246 | true // only_if_ref | |
3247 | }, | |
3248 | { | |
3249 | "__rela_iplt_end", // name | |
3250 | elfcpp::PT_LOAD, // segment_type | |
3251 | elfcpp::PF_W, // segment_flags_set | |
3252 | elfcpp::PF(0), // segment_flags_clear | |
3253 | 0, // value | |
3254 | 0, // size | |
3255 | elfcpp::STT_NOTYPE, // type | |
3256 | elfcpp::STB_GLOBAL, // binding | |
3257 | elfcpp::STV_HIDDEN, // visibility | |
3258 | 0, // nonvis | |
3259 | Symbol::SEGMENT_START, // offset_from_base | |
3260 | true // only_if_ref | |
3261 | } | |
3262 | }; | |
3263 | ||
3264 | symtab->define_symbols(layout, 2, syms, | |
3265 | layout->script_options()->saw_sections_clause()); | |
3266 | } | |
2e30d253 ILT |
3267 | } |
3268 | ||
3269 | // Perform a relocation. | |
3270 | ||
fc51264f | 3271 | template<int size> |
2e30d253 | 3272 | inline bool |
fc51264f L |
3273 | Target_x86_64<size>::Relocate::relocate( |
3274 | const Relocate_info<size, false>* relinfo, | |
3275 | Target_x86_64<size>* target, | |
3276 | Output_section*, | |
3277 | size_t relnum, | |
3278 | const elfcpp::Rela<size, false>& rela, | |
3279 | unsigned int r_type, | |
3280 | const Sized_symbol<size>* gsym, | |
3281 | const Symbol_value<size>* psymval, | |
3282 | unsigned char* view, | |
3283 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3284 | section_size_type view_size) | |
2e30d253 ILT |
3285 | { |
3286 | if (this->skip_call_tls_get_addr_) | |
3287 | { | |
5efc7cd2 | 3288 | if ((r_type != elfcpp::R_X86_64_PLT32 |
f49fe902 L |
3289 | && r_type != elfcpp::R_X86_64_PLT32_BND |
3290 | && r_type != elfcpp::R_X86_64_PC32_BND | |
2e702c99 | 3291 | && r_type != elfcpp::R_X86_64_PC32) |
2e30d253 | 3292 | || gsym == NULL |
0ffd9845 | 3293 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 3294 | { |
75f2446e ILT |
3295 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3296 | _("missing expected TLS relocation")); | |
3297 | } | |
3298 | else | |
3299 | { | |
3300 | this->skip_call_tls_get_addr_ = false; | |
3301 | return false; | |
2e30d253 | 3302 | } |
2e30d253 ILT |
3303 | } |
3304 | ||
0e804863 ILT |
3305 | if (view == NULL) |
3306 | return true; | |
3307 | ||
fc51264f | 3308 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
3309 | |
3310 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 3311 | Symbol_value<size> symval; |
96f2030e | 3312 | if (gsym != NULL |
95a2c8d6 | 3313 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 3314 | { |
19fec8c1 | 3315 | symval.set_output_value(target->plt_address_for_global(gsym)); |
2e30d253 ILT |
3316 | psymval = &symval; |
3317 | } | |
7223e9ca ILT |
3318 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
3319 | { | |
fc51264f | 3320 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
3321 | if (object->local_has_plt_offset(r_sym)) |
3322 | { | |
19fec8c1 | 3323 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
3324 | psymval = &symval; |
3325 | } | |
3326 | } | |
2e30d253 | 3327 | |
0ffd9845 ILT |
3328 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
3329 | ||
3330 | // Get the GOT offset if needed. | |
96f2030e ILT |
3331 | // The GOT pointer points to the end of the GOT section. |
3332 | // We need to subtract the size of the GOT section to get | |
3333 | // the actual offset to use in the relocation. | |
0ffd9845 | 3334 | bool have_got_offset = false; |
c23dd342 L |
3335 | // Since the actual offset is always negative, we use signed int to |
3336 | // support 64-bit GOT relocations. | |
3337 | int got_offset = 0; | |
0ffd9845 ILT |
3338 | switch (r_type) |
3339 | { | |
3340 | case elfcpp::R_X86_64_GOT32: | |
3341 | case elfcpp::R_X86_64_GOT64: | |
3342 | case elfcpp::R_X86_64_GOTPLT64: | |
3343 | case elfcpp::R_X86_64_GOTPCREL: | |
3344 | case elfcpp::R_X86_64_GOTPCREL64: | |
3345 | if (gsym != NULL) | |
2e702c99 RM |
3346 | { |
3347 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3348 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
3349 | } | |
0ffd9845 | 3350 | else |
2e702c99 RM |
3351 | { |
3352 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3353 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3354 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3355 | - target->got_size()); | |
3356 | } | |
0ffd9845 ILT |
3357 | have_got_offset = true; |
3358 | break; | |
3359 | ||
3360 | default: | |
3361 | break; | |
3362 | } | |
2e30d253 ILT |
3363 | |
3364 | switch (r_type) | |
3365 | { | |
3366 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3367 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3368 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3369 | break; |
3370 | ||
3371 | case elfcpp::R_X86_64_64: | |
fc51264f | 3372 | Relocate_functions<size, false>::rela64(view, object, psymval, addend); |
2e30d253 ILT |
3373 | break; |
3374 | ||
3375 | case elfcpp::R_X86_64_PC64: | |
fc51264f | 3376 | Relocate_functions<size, false>::pcrela64(view, object, psymval, addend, |
2e702c99 | 3377 | address); |
2e30d253 ILT |
3378 | break; |
3379 | ||
3380 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
3381 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3382 | // uint64_t x = value + addend; | |
3383 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
3384 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
fc51264f | 3385 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3386 | break; |
3387 | ||
3388 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
3389 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3390 | // int64_t x = value + addend; // note this quantity is signed! | |
3391 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
fc51264f | 3392 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3393 | break; |
3394 | ||
3395 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 3396 | case elfcpp::R_X86_64_PC32_BND: |
fc51264f L |
3397 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3398 | address); | |
2e30d253 ILT |
3399 | break; |
3400 | ||
3401 | case elfcpp::R_X86_64_16: | |
fc51264f | 3402 | Relocate_functions<size, false>::rela16(view, object, psymval, addend); |
2e30d253 ILT |
3403 | break; |
3404 | ||
3405 | case elfcpp::R_X86_64_PC16: | |
fc51264f L |
3406 | Relocate_functions<size, false>::pcrela16(view, object, psymval, addend, |
3407 | address); | |
2e30d253 ILT |
3408 | break; |
3409 | ||
3410 | case elfcpp::R_X86_64_8: | |
fc51264f | 3411 | Relocate_functions<size, false>::rela8(view, object, psymval, addend); |
2e30d253 ILT |
3412 | break; |
3413 | ||
3414 | case elfcpp::R_X86_64_PC8: | |
fc51264f L |
3415 | Relocate_functions<size, false>::pcrela8(view, object, psymval, addend, |
3416 | address); | |
2e30d253 ILT |
3417 | break; |
3418 | ||
3419 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 3420 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 | 3421 | gold_assert(gsym == NULL |
2e702c99 | 3422 | || gsym->has_plt_offset() |
99f8faca ILT |
3423 | || gsym->final_value_is_known() |
3424 | || (gsym->is_defined() | |
3425 | && !gsym->is_from_dynobj() | |
3426 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
3427 | // Note: while this code looks the same as for R_X86_64_PC32, it |
3428 | // behaves differently because psymval was set to point to | |
3429 | // the PLT entry, rather than the symbol, in Scan::global(). | |
fc51264f L |
3430 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3431 | address); | |
2e30d253 ILT |
3432 | break; |
3433 | ||
ee9e9e86 ILT |
3434 | case elfcpp::R_X86_64_PLTOFF64: |
3435 | { | |
2e702c99 RM |
3436 | gold_assert(gsym); |
3437 | gold_assert(gsym->has_plt_offset() | |
3438 | || gsym->final_value_is_known()); | |
fc51264f | 3439 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
c23dd342 L |
3440 | // This is the address of GLOBAL_OFFSET_TABLE. |
3441 | got_address = target->got_plt_section()->address(); | |
fc51264f L |
3442 | Relocate_functions<size, false>::rela64(view, object, psymval, |
3443 | addend - got_address); | |
ee9e9e86 | 3444 | } |
7849f6d8 | 3445 | break; |
ee9e9e86 | 3446 | |
2e30d253 | 3447 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 3448 | gold_assert(have_got_offset); |
fc51264f | 3449 | Relocate_functions<size, false>::rela32(view, got_offset, addend); |
2e30d253 ILT |
3450 | break; |
3451 | ||
e822f2b1 ILT |
3452 | case elfcpp::R_X86_64_GOTPC32: |
3453 | { | |
2e702c99 | 3454 | gold_assert(gsym); |
fc51264f | 3455 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3456 | value = target->got_plt_section()->address(); |
fc51264f | 3457 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
e822f2b1 ILT |
3458 | } |
3459 | break; | |
3460 | ||
3461 | case elfcpp::R_X86_64_GOT64: | |
fdc2f80f | 3462 | case elfcpp::R_X86_64_GOTPLT64: |
e88ba8d5 L |
3463 | // R_X86_64_GOTPLT64 is obsolete and treated the the same as |
3464 | // GOT64. | |
0ffd9845 | 3465 | gold_assert(have_got_offset); |
fc51264f | 3466 | Relocate_functions<size, false>::rela64(view, got_offset, addend); |
e822f2b1 ILT |
3467 | break; |
3468 | ||
3469 | case elfcpp::R_X86_64_GOTPC64: | |
3470 | { | |
2e702c99 | 3471 | gold_assert(gsym); |
fc51264f | 3472 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3473 | value = target->got_plt_section()->address(); |
fc51264f | 3474 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
3475 | } |
3476 | break; | |
3477 | ||
2e30d253 ILT |
3478 | case elfcpp::R_X86_64_GOTOFF64: |
3479 | { | |
fc51264f | 3480 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
2e30d253 | 3481 | value = (psymval->value(object, 0) |
96f2030e | 3482 | - target->got_plt_section()->address()); |
fc51264f | 3483 | Relocate_functions<size, false>::rela64(view, value, addend); |
2e30d253 ILT |
3484 | } |
3485 | break; | |
3486 | ||
3487 | case elfcpp::R_X86_64_GOTPCREL: | |
3488 | { | |
2e702c99 RM |
3489 | gold_assert(have_got_offset); |
3490 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3491 | value = target->got_plt_section()->address() + got_offset; | |
3492 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); | |
2e30d253 ILT |
3493 | } |
3494 | break; | |
3495 | ||
e822f2b1 ILT |
3496 | case elfcpp::R_X86_64_GOTPCREL64: |
3497 | { | |
2e702c99 RM |
3498 | gold_assert(have_got_offset); |
3499 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3500 | value = target->got_plt_section()->address() + got_offset; | |
3501 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); | |
e822f2b1 ILT |
3502 | } |
3503 | break; | |
3504 | ||
2e30d253 ILT |
3505 | case elfcpp::R_X86_64_COPY: |
3506 | case elfcpp::R_X86_64_GLOB_DAT: | |
3507 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3508 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3509 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3510 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3511 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3512 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3513 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3514 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3515 | _("unexpected reloc %u in object file"), | |
3516 | r_type); | |
2e30d253 ILT |
3517 | break; |
3518 | ||
d61c17ea | 3519 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3520 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3521 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3522 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3523 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3524 | case elfcpp::R_X86_64_DTPOFF32: |
3525 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3526 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3527 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 | 3528 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2e702c99 | 3529 | view, address, view_size); |
2e30d253 | 3530 | break; |
2e30d253 | 3531 | |
fdc2f80f ILT |
3532 | case elfcpp::R_X86_64_SIZE32: |
3533 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3534 | default: |
75f2446e ILT |
3535 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3536 | _("unsupported reloc %u"), | |
3537 | r_type); | |
2e30d253 ILT |
3538 | break; |
3539 | } | |
3540 | ||
3541 | return true; | |
3542 | } | |
3543 | ||
3544 | // Perform a TLS relocation. | |
3545 | ||
fc51264f | 3546 | template<int size> |
2e30d253 | 3547 | inline void |
fc51264f L |
3548 | Target_x86_64<size>::Relocate::relocate_tls( |
3549 | const Relocate_info<size, false>* relinfo, | |
3550 | Target_x86_64<size>* target, | |
3551 | size_t relnum, | |
3552 | const elfcpp::Rela<size, false>& rela, | |
3553 | unsigned int r_type, | |
3554 | const Sized_symbol<size>* gsym, | |
3555 | const Symbol_value<size>* psymval, | |
3556 | unsigned char* view, | |
3557 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3558 | section_size_type view_size) | |
2e30d253 | 3559 | { |
2e30d253 | 3560 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 3561 | |
fc51264f | 3562 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 3563 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 3564 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 3565 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 3566 | |
fc51264f | 3567 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
3568 | |
3569 | const bool is_final = (gsym == NULL | |
b3705d2a | 3570 | ? !parameters->options().shared() |
2e30d253 | 3571 | : gsym->final_value_is_known()); |
36171d64 | 3572 | tls::Tls_optimization optimized_type |
fc51264f | 3573 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3574 | switch (r_type) |
3575 | { | |
56622147 | 3576 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
3577 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3578 | { | |
3579 | // If this code sequence is used in a non-executable section, | |
3580 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
3581 | // on the assumption that it's being used by itself in a debug | |
3582 | // section. Therefore, in the unlikely event that the code | |
3583 | // sequence appears in a non-executable section, we simply | |
3584 | // leave it unoptimized. | |
3585 | optimized_type = tls::TLSOPT_NONE; | |
3586 | } | |
e041f13d | 3587 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 3588 | { |
62855347 ILT |
3589 | if (tls_segment == NULL) |
3590 | { | |
191f1a2d ILT |
3591 | gold_assert(parameters->errors()->error_count() > 0 |
3592 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3593 | return; |
3594 | } | |
2e30d253 | 3595 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 3596 | rela, r_type, value, view, |
2e30d253 ILT |
3597 | view_size); |
3598 | break; | |
3599 | } | |
7bf1f802 | 3600 | else |
2e702c99 RM |
3601 | { |
3602 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3603 | ? GOT_TYPE_TLS_OFFSET | |
3604 | : GOT_TYPE_TLS_PAIR); | |
3605 | unsigned int got_offset; | |
3606 | if (gsym != NULL) | |
3607 | { | |
3608 | gold_assert(gsym->has_got_offset(got_type)); | |
3609 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
3610 | } | |
3611 | else | |
3612 | { | |
3613 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3614 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3615 | got_offset = (object->local_got_offset(r_sym, got_type) | |
3616 | - target->got_size()); | |
3617 | } | |
3618 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3619 | { | |
3620 | value = target->got_plt_section()->address() + got_offset; | |
3621 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
3622 | value, view, address, view_size); | |
3623 | break; | |
3624 | } | |
3625 | else if (optimized_type == tls::TLSOPT_NONE) | |
3626 | { | |
3627 | // Relocate the field with the offset of the pair of GOT | |
3628 | // entries. | |
6a41d30b | 3629 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3630 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3631 | address); |
2e702c99 RM |
3632 | break; |
3633 | } | |
3634 | } | |
72ec2876 | 3635 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3636 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
3637 | break; |
3638 | ||
c2b45e22 CC |
3639 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
3640 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
3641 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3642 | { | |
3643 | // See above comment for R_X86_64_TLSGD. | |
3644 | optimized_type = tls::TLSOPT_NONE; | |
3645 | } | |
c2b45e22 CC |
3646 | if (optimized_type == tls::TLSOPT_TO_LE) |
3647 | { | |
62855347 ILT |
3648 | if (tls_segment == NULL) |
3649 | { | |
191f1a2d ILT |
3650 | gold_assert(parameters->errors()->error_count() > 0 |
3651 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3652 | return; |
3653 | } | |
c2b45e22 | 3654 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3655 | rela, r_type, value, view, |
3656 | view_size); | |
c2b45e22 CC |
3657 | break; |
3658 | } | |
3659 | else | |
2e702c99 RM |
3660 | { |
3661 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3662 | ? GOT_TYPE_TLS_OFFSET | |
3663 | : GOT_TYPE_TLS_DESC); | |
3664 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3665 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC |
3666 | && optimized_type == tls::TLSOPT_NONE) | |
3667 | { | |
3668 | // We created GOT entries in the .got.tlsdesc portion of | |
3669 | // the .got.plt section, but the offset stored in the | |
3670 | // symbol is the offset within .got.tlsdesc. | |
3671 | got_offset = (target->got_size() | |
3672 | + target->got_plt_section()->data_size()); | |
3673 | } | |
2e702c99 RM |
3674 | if (gsym != NULL) |
3675 | { | |
3676 | gold_assert(gsym->has_got_offset(got_type)); | |
3677 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3678 | } | |
3679 | else | |
3680 | { | |
3681 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3682 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3683 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3684 | - target->got_size()); |
2e702c99 RM |
3685 | } |
3686 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3687 | { | |
62855347 ILT |
3688 | if (tls_segment == NULL) |
3689 | { | |
191f1a2d ILT |
3690 | gold_assert(parameters->errors()->error_count() > 0 |
3691 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3692 | return; |
3693 | } | |
2e702c99 RM |
3694 | value = target->got_plt_section()->address() + got_offset; |
3695 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
3696 | rela, r_type, value, view, address, | |
3697 | view_size); | |
3698 | break; | |
3699 | } | |
3700 | else if (optimized_type == tls::TLSOPT_NONE) | |
3701 | { | |
3702 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3703 | { | |
3704 | // Relocate the field with the offset of the pair of GOT | |
3705 | // entries. | |
3706 | value = target->got_plt_section()->address() + got_offset; | |
3707 | Relocate_functions<size, false>::pcrela32(view, value, addend, | |
fc51264f | 3708 | address); |
2e702c99 RM |
3709 | } |
3710 | break; | |
3711 | } | |
3712 | } | |
c2b45e22 CC |
3713 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3714 | _("unsupported reloc %u"), r_type); | |
3715 | break; | |
3716 | ||
56622147 | 3717 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
3718 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3719 | { | |
3720 | // See above comment for R_X86_64_TLSGD. | |
3721 | optimized_type = tls::TLSOPT_NONE; | |
3722 | } | |
e041f13d | 3723 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3724 | { |
62855347 ILT |
3725 | if (tls_segment == NULL) |
3726 | { | |
191f1a2d ILT |
3727 | gold_assert(parameters->errors()->error_count() > 0 |
3728 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3729 | return; |
3730 | } | |
72ec2876 ILT |
3731 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
3732 | value, view, view_size); | |
3733 | break; | |
2e702c99 | 3734 | } |
7bf1f802 | 3735 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3736 | { |
3737 | // Relocate the field with the offset of the GOT entry for | |
3738 | // the module index. | |
3739 | unsigned int got_offset; | |
3740 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
31d60480 | 3741 | - target->got_size()); |
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 | } | |
72ec2876 | 3747 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3748 | _("unsupported reloc %u"), r_type); |
2e30d253 | 3749 | break; |
0ffd9845 ILT |
3750 | |
3751 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
3752 | // This relocation type is used in debugging information. |
3753 | // In that case we need to not optimize the value. If the | |
3754 | // section is not executable, then we assume we should not | |
3755 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
3756 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
3757 | // R_X86_64_TLSLD. | |
3758 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3759 | { | |
62855347 ILT |
3760 | if (tls_segment == NULL) |
3761 | { | |
191f1a2d ILT |
3762 | gold_assert(parameters->errors()->error_count() > 0 |
3763 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3764 | return; |
3765 | } | |
36171d64 CC |
3766 | value -= tls_segment->memsz(); |
3767 | } | |
fc51264f | 3768 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
3769 | break; |
3770 | ||
3771 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
3772 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
3773 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3774 | { | |
62855347 ILT |
3775 | if (tls_segment == NULL) |
3776 | { | |
191f1a2d ILT |
3777 | gold_assert(parameters->errors()->error_count() > 0 |
3778 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3779 | return; |
3780 | } | |
36171d64 CC |
3781 | value -= tls_segment->memsz(); |
3782 | } | |
fc51264f | 3783 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 3784 | break; |
2e30d253 | 3785 | |
56622147 | 3786 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
65d92137 CC |
3787 | if (gsym != NULL && gsym->is_undefined()) |
3788 | { | |
3789 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, | |
3790 | NULL, rela, | |
3791 | r_type, value, view, | |
3792 | view_size); | |
3793 | break; | |
3794 | } | |
3795 | else if (optimized_type == tls::TLSOPT_TO_LE) | |
56622147 | 3796 | { |
62855347 ILT |
3797 | if (tls_segment == NULL) |
3798 | { | |
191f1a2d ILT |
3799 | gold_assert(parameters->errors()->error_count() > 0 |
3800 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3801 | return; |
3802 | } | |
fc51264f L |
3803 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
3804 | tls_segment, rela, | |
3805 | r_type, value, view, | |
3806 | view_size); | |
56622147 ILT |
3807 | break; |
3808 | } | |
7bf1f802 | 3809 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3810 | { |
3811 | // Relocate the field with the offset of the GOT entry for | |
3812 | // the tp-relative offset of the symbol. | |
3813 | unsigned int got_offset; | |
3814 | if (gsym != NULL) | |
3815 | { | |
3816 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); | |
3817 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
3818 | - target->got_size()); | |
3819 | } | |
3820 | else | |
3821 | { | |
3822 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3823 | gold_assert(object->local_has_got_offset(r_sym, | |
3824 | GOT_TYPE_TLS_OFFSET)); | |
3825 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
3826 | - target->got_size()); | |
3827 | } | |
6a41d30b | 3828 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3829 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3830 | address); |
2e702c99 RM |
3831 | break; |
3832 | } | |
56622147 ILT |
3833 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3834 | _("unsupported reloc type %u"), | |
3835 | r_type); | |
3836 | break; | |
0ffd9845 | 3837 | |
56622147 | 3838 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
3839 | if (tls_segment == NULL) |
3840 | { | |
191f1a2d ILT |
3841 | gold_assert(parameters->errors()->error_count() > 0 |
3842 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3843 | return; |
3844 | } | |
6a41d30b | 3845 | value -= tls_segment->memsz(); |
fc51264f | 3846 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 3847 | break; |
2e30d253 | 3848 | } |
2e30d253 ILT |
3849 | } |
3850 | ||
7bf1f802 ILT |
3851 | // Do a relocation in which we convert a TLS General-Dynamic to an |
3852 | // Initial-Exec. | |
3853 | ||
fc51264f | 3854 | template<int size> |
7bf1f802 | 3855 | inline void |
fc51264f L |
3856 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
3857 | const Relocate_info<size, false>* relinfo, | |
3858 | size_t relnum, | |
3859 | Output_segment*, | |
3860 | const elfcpp::Rela<size, false>& rela, | |
3861 | unsigned int, | |
3862 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3863 | unsigned char* view, | |
3864 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3865 | section_size_type view_size) | |
7bf1f802 | 3866 | { |
41194d9f L |
3867 | // For SIZE == 64: |
3868 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3869 | // .word 0x6666; rex64; call __tls_get_addr | |
3870 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
3871 | // For SIZE == 32: | |
3872 | // leaq foo@tlsgd(%rip),%rdi; | |
3873 | // .word 0x6666; rex64; call __tls_get_addr | |
3874 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax | |
7bf1f802 | 3875 | |
7bf1f802 | 3876 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
7bf1f802 | 3877 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 3878 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
7bf1f802 | 3879 | |
41194d9f L |
3880 | if (size == 64) |
3881 | { | |
3882 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3883 | -4); | |
3884 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3885 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3886 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3887 | 16); | |
3888 | } | |
3889 | else | |
3890 | { | |
3891 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3892 | -3); | |
3893 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3894 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
3895 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3896 | 15); | |
3897 | } | |
7bf1f802 | 3898 | |
c2b45e22 | 3899 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
3900 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
3901 | address); | |
7bf1f802 ILT |
3902 | |
3903 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3904 | // We can skip it. | |
3905 | this->skip_call_tls_get_addr_ = true; | |
3906 | } | |
3907 | ||
e041f13d | 3908 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
3909 | // Local-Exec. |
3910 | ||
fc51264f | 3911 | template<int size> |
2e30d253 | 3912 | inline void |
fc51264f L |
3913 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
3914 | const Relocate_info<size, false>* relinfo, | |
3915 | size_t relnum, | |
3916 | Output_segment* tls_segment, | |
3917 | const elfcpp::Rela<size, false>& rela, | |
3918 | unsigned int, | |
3919 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3920 | unsigned char* view, | |
3921 | section_size_type view_size) | |
2e30d253 | 3922 | { |
41194d9f L |
3923 | // For SIZE == 64: |
3924 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3925 | // .word 0x6666; rex64; call __tls_get_addr | |
3926 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
3927 | // For SIZE == 32: | |
3928 | // leaq foo@tlsgd(%rip),%rdi; | |
3929 | // .word 0x6666; rex64; call __tls_get_addr | |
3930 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 3931 | |
72ec2876 | 3932 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
72ec2876 | 3933 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
41194d9f L |
3934 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
3935 | ||
3936 | if (size == 64) | |
3937 | { | |
3938 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3939 | -4); | |
3940 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3941 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3942 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", | |
3943 | 16); | |
3944 | } | |
3945 | else | |
3946 | { | |
3947 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3948 | -3); | |
3949 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3950 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
2e30d253 | 3951 | |
41194d9f L |
3952 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", |
3953 | 15); | |
3954 | } | |
2e30d253 | 3955 | |
6a41d30b | 3956 | value -= tls_segment->memsz(); |
fc51264f | 3957 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
3958 | |
3959 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3960 | // We can skip it. | |
3961 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3962 | } |
3963 | ||
c2b45e22 CC |
3964 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
3965 | ||
fc51264f | 3966 | template<int size> |
c2b45e22 | 3967 | inline void |
fc51264f L |
3968 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
3969 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3970 | size_t relnum, |
3971 | Output_segment*, | |
fc51264f | 3972 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3973 | unsigned int r_type, |
fc51264f | 3974 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 3975 | unsigned char* view, |
fc51264f | 3976 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
3977 | section_size_type view_size) |
3978 | { | |
3979 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3980 | { | |
3981 | // leaq foo@tlsdesc(%rip), %rax | |
3982 | // ==> movq foo@gottpoff(%rip), %rax | |
3983 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3984 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3985 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3986 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
3987 | view[-2] = 0x8b; |
3988 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 3989 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
3990 | } |
3991 | else | |
3992 | { | |
3993 | // call *foo@tlscall(%rax) | |
3994 | // ==> nop; nop | |
3995 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3996 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3997 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3998 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3999 | view[0] = 0x66; |
4000 | view[1] = 0x90; | |
4001 | } | |
4002 | } | |
4003 | ||
4004 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
4005 | ||
fc51264f | 4006 | template<int size> |
c2b45e22 | 4007 | inline void |
fc51264f L |
4008 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
4009 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
4010 | size_t relnum, |
4011 | Output_segment* tls_segment, | |
fc51264f | 4012 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 4013 | unsigned int r_type, |
fc51264f | 4014 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
4015 | unsigned char* view, |
4016 | section_size_type view_size) | |
4017 | { | |
4018 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
4019 | { | |
4020 | // leaq foo@tlsdesc(%rip), %rax | |
4021 | // ==> movq foo@tpoff, %rax | |
4022 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4023 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4024 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4025 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
4026 | view[-2] = 0xc7; |
4027 | view[-1] = 0xc0; | |
4028 | value -= tls_segment->memsz(); | |
fc51264f | 4029 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
4030 | } |
4031 | else | |
4032 | { | |
4033 | // call *foo@tlscall(%rax) | |
4034 | // ==> nop; nop | |
4035 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
4036 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
4037 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 4038 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
4039 | view[0] = 0x66; |
4040 | view[1] = 0x90; | |
4041 | } | |
4042 | } | |
4043 | ||
fc51264f | 4044 | template<int size> |
2e30d253 | 4045 | inline void |
fc51264f L |
4046 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
4047 | const Relocate_info<size, false>* relinfo, | |
4048 | size_t relnum, | |
4049 | Output_segment*, | |
4050 | const elfcpp::Rela<size, false>& rela, | |
4051 | unsigned int, | |
4052 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
4053 | unsigned char* view, | |
4054 | section_size_type view_size) | |
2e30d253 | 4055 | { |
72ec2876 | 4056 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
d2cf1c6c | 4057 | // For SIZE == 64: |
72ec2876 ILT |
4058 | // ... leq foo@dtpoff(%rax),%reg |
4059 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
d2cf1c6c L |
4060 | // For SIZE == 32: |
4061 | // ... leq foo@dtpoff(%rax),%reg | |
4062 | // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 4063 | |
72ec2876 ILT |
4064 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
4065 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 4066 | |
72ec2876 | 4067 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 4068 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); |
72ec2876 ILT |
4069 | |
4070 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
4071 | ||
d2cf1c6c L |
4072 | if (size == 64) |
4073 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
4074 | else | |
4075 | memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12); | |
72ec2876 ILT |
4076 | |
4077 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4078 | // We can skip it. | |
4079 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
4080 | } |
4081 | ||
56622147 ILT |
4082 | // Do a relocation in which we convert a TLS Initial-Exec to a |
4083 | // Local-Exec. | |
4084 | ||
fc51264f | 4085 | template<int size> |
56622147 | 4086 | inline void |
fc51264f L |
4087 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
4088 | const Relocate_info<size, false>* relinfo, | |
4089 | size_t relnum, | |
4090 | Output_segment* tls_segment, | |
4091 | const elfcpp::Rela<size, false>& rela, | |
4092 | unsigned int, | |
4093 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4094 | unsigned char* view, | |
4095 | section_size_type view_size) | |
56622147 ILT |
4096 | { |
4097 | // We need to examine the opcodes to figure out which instruction we | |
4098 | // are looking at. | |
4099 | ||
4100 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
4101 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
4102 | ||
4103 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4104 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4105 | ||
4106 | unsigned char op1 = view[-3]; | |
4107 | unsigned char op2 = view[-2]; | |
4108 | unsigned char op3 = view[-1]; | |
4109 | unsigned char reg = op3 >> 3; | |
4110 | ||
4111 | if (op2 == 0x8b) | |
4112 | { | |
4113 | // movq | |
4114 | if (op1 == 0x4c) | |
2e702c99 | 4115 | view[-3] = 0x49; |
e749cab8 L |
4116 | else if (size == 32 && op1 == 0x44) |
4117 | view[-3] = 0x41; | |
56622147 ILT |
4118 | view[-2] = 0xc7; |
4119 | view[-1] = 0xc0 | reg; | |
4120 | } | |
4121 | else if (reg == 4) | |
4122 | { | |
4123 | // Special handling for %rsp. | |
4124 | if (op1 == 0x4c) | |
2e702c99 | 4125 | view[-3] = 0x49; |
e749cab8 L |
4126 | else if (size == 32 && op1 == 0x44) |
4127 | view[-3] = 0x41; | |
56622147 ILT |
4128 | view[-2] = 0x81; |
4129 | view[-1] = 0xc0 | reg; | |
4130 | } | |
4131 | else | |
4132 | { | |
4133 | // addq | |
4134 | if (op1 == 0x4c) | |
2e702c99 | 4135 | view[-3] = 0x4d; |
e749cab8 L |
4136 | else if (size == 32 && op1 == 0x44) |
4137 | view[-3] = 0x45; | |
56622147 ILT |
4138 | view[-2] = 0x8d; |
4139 | view[-1] = 0x80 | reg | (reg << 3); | |
4140 | } | |
4141 | ||
65d92137 CC |
4142 | if (tls_segment != NULL) |
4143 | value -= tls_segment->memsz(); | |
fc51264f | 4144 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
4145 | } |
4146 | ||
2e30d253 ILT |
4147 | // Relocate section data. |
4148 | ||
fc51264f | 4149 | template<int size> |
2e30d253 | 4150 | void |
fc51264f L |
4151 | Target_x86_64<size>::relocate_section( |
4152 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
4153 | unsigned int sh_type, |
4154 | const unsigned char* prelocs, | |
4155 | size_t reloc_count, | |
4156 | Output_section* output_section, | |
4157 | bool needs_special_offset_handling, | |
4158 | unsigned char* view, | |
fc51264f | 4159 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
4160 | section_size_type view_size, |
4161 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
4162 | { |
4163 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4164 | ||
fc51264f | 4165 | gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
168a4726 AM |
4166 | typename Target_x86_64<size>::Relocate, |
4167 | gold::Default_comdat_behavior>( | |
2e30d253 ILT |
4168 | relinfo, |
4169 | this, | |
4170 | prelocs, | |
4171 | reloc_count, | |
730cdc88 ILT |
4172 | output_section, |
4173 | needs_special_offset_handling, | |
2e30d253 ILT |
4174 | view, |
4175 | address, | |
364c7fa5 ILT |
4176 | view_size, |
4177 | reloc_symbol_changes); | |
2e30d253 ILT |
4178 | } |
4179 | ||
94a3fc8b CC |
4180 | // Apply an incremental relocation. Incremental relocations always refer |
4181 | // to global symbols. | |
4182 | ||
fc51264f | 4183 | template<int size> |
94a3fc8b | 4184 | void |
fc51264f L |
4185 | Target_x86_64<size>::apply_relocation( |
4186 | const Relocate_info<size, false>* relinfo, | |
4187 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 4188 | unsigned int r_type, |
fc51264f | 4189 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
4190 | const Symbol* gsym, |
4191 | unsigned char* view, | |
fc51264f | 4192 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
4193 | section_size_type view_size) |
4194 | { | |
fc51264f | 4195 | gold::apply_relocation<size, false, Target_x86_64<size>, |
618d6666 | 4196 | typename Target_x86_64<size>::Relocate>( |
94a3fc8b CC |
4197 | relinfo, |
4198 | this, | |
4199 | r_offset, | |
4200 | r_type, | |
4201 | r_addend, | |
4202 | gsym, | |
4203 | view, | |
4204 | address, | |
4205 | view_size); | |
4206 | } | |
4207 | ||
6a74a719 ILT |
4208 | // Return the size of a relocation while scanning during a relocatable |
4209 | // link. | |
4210 | ||
fc51264f | 4211 | template<int size> |
6a74a719 | 4212 | unsigned int |
fc51264f | 4213 | Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc( |
6a74a719 ILT |
4214 | unsigned int r_type, |
4215 | Relobj* object) | |
4216 | { | |
4217 | switch (r_type) | |
4218 | { | |
4219 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
4220 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
4221 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
4222 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
4223 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
4224 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
4225 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
4226 | case elfcpp::R_X86_64_DTPOFF32: | |
4227 | case elfcpp::R_X86_64_DTPOFF64: | |
4228 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
4229 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
4230 | return 0; | |
4231 | ||
4232 | case elfcpp::R_X86_64_64: | |
4233 | case elfcpp::R_X86_64_PC64: | |
4234 | case elfcpp::R_X86_64_GOTOFF64: | |
4235 | case elfcpp::R_X86_64_GOTPC64: | |
4236 | case elfcpp::R_X86_64_PLTOFF64: | |
4237 | case elfcpp::R_X86_64_GOT64: | |
4238 | case elfcpp::R_X86_64_GOTPCREL64: | |
4239 | case elfcpp::R_X86_64_GOTPCREL: | |
4240 | case elfcpp::R_X86_64_GOTPLT64: | |
4241 | return 8; | |
4242 | ||
4243 | case elfcpp::R_X86_64_32: | |
4244 | case elfcpp::R_X86_64_32S: | |
4245 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 4246 | case elfcpp::R_X86_64_PC32_BND: |
6a74a719 | 4247 | case elfcpp::R_X86_64_PLT32: |
f49fe902 | 4248 | case elfcpp::R_X86_64_PLT32_BND: |
6a74a719 ILT |
4249 | case elfcpp::R_X86_64_GOTPC32: |
4250 | case elfcpp::R_X86_64_GOT32: | |
4251 | return 4; | |
4252 | ||
4253 | case elfcpp::R_X86_64_16: | |
4254 | case elfcpp::R_X86_64_PC16: | |
4255 | return 2; | |
4256 | ||
4257 | case elfcpp::R_X86_64_8: | |
4258 | case elfcpp::R_X86_64_PC8: | |
4259 | return 1; | |
4260 | ||
4261 | case elfcpp::R_X86_64_COPY: | |
4262 | case elfcpp::R_X86_64_GLOB_DAT: | |
4263 | case elfcpp::R_X86_64_JUMP_SLOT: | |
4264 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 4265 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
4266 | // These are outstanding tls relocs, which are unexpected when linking |
4267 | case elfcpp::R_X86_64_TPOFF64: | |
4268 | case elfcpp::R_X86_64_DTPMOD64: | |
4269 | case elfcpp::R_X86_64_TLSDESC: | |
4270 | object->error(_("unexpected reloc %u in object file"), r_type); | |
4271 | return 0; | |
4272 | ||
4273 | case elfcpp::R_X86_64_SIZE32: | |
4274 | case elfcpp::R_X86_64_SIZE64: | |
4275 | default: | |
4276 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
4277 | return 0; | |
4278 | } | |
4279 | } | |
4280 | ||
4281 | // Scan the relocs during a relocatable link. | |
4282 | ||
fc51264f | 4283 | template<int size> |
6a74a719 | 4284 | void |
fc51264f L |
4285 | Target_x86_64<size>::scan_relocatable_relocs( |
4286 | Symbol_table* symtab, | |
4287 | Layout* layout, | |
4288 | Sized_relobj_file<size, false>* object, | |
4289 | unsigned int data_shndx, | |
4290 | unsigned int sh_type, | |
4291 | const unsigned char* prelocs, | |
4292 | size_t reloc_count, | |
4293 | Output_section* output_section, | |
4294 | bool needs_special_offset_handling, | |
4295 | size_t local_symbol_count, | |
4296 | const unsigned char* plocal_symbols, | |
4297 | Relocatable_relocs* rr) | |
6a74a719 ILT |
4298 | { |
4299 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4300 | ||
4301 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
4302 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
4303 | ||
fc51264f | 4304 | gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA, |
6a74a719 | 4305 | Scan_relocatable_relocs>( |
6a74a719 ILT |
4306 | symtab, |
4307 | layout, | |
4308 | object, | |
4309 | data_shndx, | |
4310 | prelocs, | |
4311 | reloc_count, | |
4312 | output_section, | |
4313 | needs_special_offset_handling, | |
4314 | local_symbol_count, | |
4315 | plocal_symbols, | |
4316 | rr); | |
4317 | } | |
4318 | ||
4319 | // Relocate a section during a relocatable link. | |
4320 | ||
fc51264f | 4321 | template<int size> |
6a74a719 | 4322 | void |
7404fe1b | 4323 | Target_x86_64<size>::relocate_relocs( |
fc51264f | 4324 | const Relocate_info<size, false>* relinfo, |
6a74a719 ILT |
4325 | unsigned int sh_type, |
4326 | const unsigned char* prelocs, | |
4327 | size_t reloc_count, | |
4328 | Output_section* output_section, | |
62fe925a | 4329 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
6a74a719 ILT |
4330 | const Relocatable_relocs* rr, |
4331 | unsigned char* view, | |
fc51264f | 4332 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
4333 | section_size_type view_size, |
4334 | unsigned char* reloc_view, | |
4335 | section_size_type reloc_view_size) | |
4336 | { | |
4337 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4338 | ||
7404fe1b | 4339 | gold::relocate_relocs<size, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
4340 | relinfo, |
4341 | prelocs, | |
4342 | reloc_count, | |
4343 | output_section, | |
4344 | offset_in_output_section, | |
4345 | rr, | |
4346 | view, | |
4347 | view_address, | |
4348 | view_size, | |
4349 | reloc_view, | |
4350 | reloc_view_size); | |
4351 | } | |
4352 | ||
4fb6c25d ILT |
4353 | // Return the value to use for a dynamic which requires special |
4354 | // treatment. This is how we support equality comparisons of function | |
4355 | // pointers across shared library boundaries, as described in the | |
4356 | // processor specific ABI supplement. | |
4357 | ||
fc51264f | 4358 | template<int size> |
4fb6c25d | 4359 | uint64_t |
fc51264f | 4360 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
4361 | { |
4362 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 4363 | return this->plt_address_for_global(gsym); |
4fb6c25d ILT |
4364 | } |
4365 | ||
2e30d253 ILT |
4366 | // Return a string used to fill a code section with nops to take up |
4367 | // the specified length. | |
4368 | ||
fc51264f | 4369 | template<int size> |
2e30d253 | 4370 | std::string |
fc51264f | 4371 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
4372 | { |
4373 | if (length >= 16) | |
4374 | { | |
4375 | // Build a jmpq instruction to skip over the bytes. | |
4376 | unsigned char jmp[5]; | |
4377 | jmp[0] = 0xe9; | |
04bf7072 | 4378 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 | 4379 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2e702c99 | 4380 | + std::string(length - 5, static_cast<char>(0x90))); |
2e30d253 ILT |
4381 | } |
4382 | ||
4383 | // Nop sequences of various lengths. | |
76677ad0 CC |
4384 | const char nop1[1] = { '\x90' }; // nop |
4385 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
4386 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
4387 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
2e702c99 | 4388 | '\x00'}; |
76677ad0 CC |
4389 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) |
4390 | '\x00', '\x00' }; | |
4391 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
2e702c99 | 4392 | '\x44', '\x00', '\x00' }; |
76677ad0 | 4393 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) |
2e702c99 | 4394 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4395 | '\x00' }; |
4396 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
2e702c99 | 4397 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4398 | '\x00', '\x00' }; |
4399 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
2e702c99 | 4400 | '\x84', '\x00', '\x00', |
76677ad0 CC |
4401 | '\x00', '\x00', '\x00' }; |
4402 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
2e702c99 | 4403 | '\x1f', '\x84', '\x00', |
76677ad0 CC |
4404 | '\x00', '\x00', '\x00', |
4405 | '\x00' }; | |
4406 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
2e702c99 | 4407 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4408 | '\x00', '\x00', '\x00', |
4409 | '\x00', '\x00' }; | |
4410 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
2e702c99 | 4411 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4412 | '\x84', '\x00', '\x00', |
4413 | '\x00', '\x00', '\x00' }; | |
4414 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
2e702c99 | 4415 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4416 | '\x1f', '\x84', '\x00', |
4417 | '\x00', '\x00', '\x00', | |
2e702c99 | 4418 | '\x00' }; |
76677ad0 | 4419 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4420 | '\x66', '\x66', '\x2e', // data16 |
76677ad0 CC |
4421 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
4422 | '\x00', '\x00', '\x00', | |
2e702c99 | 4423 | '\x00', '\x00' }; |
76677ad0 | 4424 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4425 | '\x66', '\x66', '\x66', // data16; data16 |
76677ad0 CC |
4426 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
4427 | '\x84', '\x00', '\x00', | |
2e702c99 | 4428 | '\x00', '\x00', '\x00' }; |
2e30d253 ILT |
4429 | |
4430 | const char* nops[16] = { | |
4431 | NULL, | |
4432 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
4433 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
4434 | }; | |
4435 | ||
4436 | return std::string(nops[length], length); | |
4437 | } | |
4438 | ||
e291e7b9 ILT |
4439 | // Return the addend to use for a target specific relocation. The |
4440 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
4441 | // symbol. We want to set the addend is the offset of the local | |
4442 | // symbol in the TLS segment. | |
4443 | ||
fc51264f | 4444 | template<int size> |
e291e7b9 | 4445 | uint64_t |
fc51264f L |
4446 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
4447 | uint64_t) const | |
e291e7b9 ILT |
4448 | { |
4449 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
4450 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
4451 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
4452 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 4453 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
4454 | gold_assert(psymval->is_tls_symbol()); |
4455 | // The value of a TLS symbol is the offset in the TLS segment. | |
4456 | return psymval->value(ti.object, 0); | |
4457 | } | |
4458 | ||
02d7cd44 ILT |
4459 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
4460 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
4461 | // assembler can not write out the difference between two labels in | |
4462 | // different sections, so instead of using a pc-relative value they | |
4463 | // use an offset from the GOT. | |
4464 | ||
fc51264f | 4465 | template<int size> |
02d7cd44 | 4466 | uint64_t |
fc51264f | 4467 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
4468 | { |
4469 | gold_assert(this->global_offset_table_ != NULL); | |
4470 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 4471 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
4472 | return ssym->value(); |
4473 | } | |
4474 | ||
364c7fa5 | 4475 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 4476 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
4477 | // code. We have to change the function so that it always ensures |
4478 | // that it has enough stack space to run some random function. | |
4479 | ||
4fc1b9d4 L |
4480 | static const unsigned char cmp_insn_32[] = { 0x64, 0x3b, 0x24, 0x25 }; |
4481 | static const unsigned char lea_r10_insn_32[] = { 0x44, 0x8d, 0x94, 0x24 }; | |
4482 | static const unsigned char lea_r11_insn_32[] = { 0x44, 0x8d, 0x9c, 0x24 }; | |
4483 | ||
4484 | static const unsigned char cmp_insn_64[] = { 0x64, 0x48, 0x3b, 0x24, 0x25 }; | |
4485 | static const unsigned char lea_r10_insn_64[] = { 0x4c, 0x8d, 0x94, 0x24 }; | |
4486 | static const unsigned char lea_r11_insn_64[] = { 0x4c, 0x8d, 0x9c, 0x24 }; | |
4487 | ||
fc51264f | 4488 | template<int size> |
364c7fa5 | 4489 | void |
fc51264f L |
4490 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
4491 | section_offset_type fnoffset, | |
4492 | section_size_type fnsize, | |
4493 | unsigned char* view, | |
4494 | section_size_type view_size, | |
4495 | std::string* from, | |
4496 | std::string* to) const | |
364c7fa5 | 4497 | { |
4fc1b9d4 L |
4498 | const char* const cmp_insn = reinterpret_cast<const char*> |
4499 | (size == 32 ? cmp_insn_32 : cmp_insn_64); | |
4500 | const char* const lea_r10_insn = reinterpret_cast<const char*> | |
4501 | (size == 32 ? lea_r10_insn_32 : lea_r10_insn_64); | |
4502 | const char* const lea_r11_insn = reinterpret_cast<const char*> | |
4503 | (size == 32 ? lea_r11_insn_32 : lea_r11_insn_64); | |
4504 | ||
4505 | const size_t cmp_insn_len = | |
4506 | (size == 32 ? sizeof(cmp_insn_32) : sizeof(cmp_insn_64)); | |
4507 | const size_t lea_r10_insn_len = | |
4508 | (size == 32 ? sizeof(lea_r10_insn_32) : sizeof(lea_r10_insn_64)); | |
4509 | const size_t lea_r11_insn_len = | |
4510 | (size == 32 ? sizeof(lea_r11_insn_32) : sizeof(lea_r11_insn_64)); | |
4511 | const size_t nop_len = (size == 32 ? 7 : 8); | |
4512 | ||
364c7fa5 ILT |
4513 | // The function starts with a comparison of the stack pointer and a |
4514 | // field in the TCB. This is followed by a jump. | |
4515 | ||
4516 | // cmp %fs:NN,%rsp | |
4fc1b9d4 L |
4517 | if (this->match_view(view, view_size, fnoffset, cmp_insn, cmp_insn_len) |
4518 | && fnsize > nop_len + 1) | |
364c7fa5 ILT |
4519 | { |
4520 | // We will call __morestack if the carry flag is set after this | |
4521 | // comparison. We turn the comparison into an stc instruction | |
4522 | // and some nops. | |
4523 | view[fnoffset] = '\xf9'; | |
4fc1b9d4 | 4524 | this->set_view_to_nop(view, view_size, fnoffset + 1, nop_len); |
364c7fa5 ILT |
4525 | } |
4526 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
4527 | // lea NN(%rsp),%r11 |
4528 | else if ((this->match_view(view, view_size, fnoffset, | |
4fc1b9d4 | 4529 | lea_r10_insn, lea_r10_insn_len) |
cbc999b9 | 4530 | || this->match_view(view, view_size, fnoffset, |
4fc1b9d4 | 4531 | lea_r11_insn, lea_r11_insn_len)) |
364c7fa5 ILT |
4532 | && fnsize > 8) |
4533 | { | |
4534 | // This is loading an offset from the stack pointer for a | |
4535 | // comparison. The offset is negative, so we decrease the | |
4536 | // offset by the amount of space we need for the stack. This | |
4537 | // means we will avoid calling __morestack if there happens to | |
4538 | // be plenty of space on the stack already. | |
4539 | unsigned char* pval = view + fnoffset + 4; | |
4540 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
4541 | val -= parameters->options().split_stack_adjust_size(); | |
4542 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
4543 | } | |
4544 | else | |
4545 | { | |
4546 | if (!object->has_no_split_stack()) | |
4547 | object->error(_("failed to match split-stack sequence at " | |
4548 | "section %u offset %0zx"), | |
ac33a407 | 4549 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
4550 | return; |
4551 | } | |
4552 | ||
4553 | // We have to change the function so that it calls | |
4554 | // __morestack_non_split instead of __morestack. The former will | |
4555 | // allocate additional stack space. | |
4556 | *from = "__morestack"; | |
4557 | *to = "__morestack_non_split"; | |
4558 | } | |
4559 | ||
2e702c99 RM |
4560 | // The selector for x86_64 object files. Note this is never instantiated |
4561 | // directly. It's only used in Target_selector_x86_64_nacl, below. | |
2e30d253 | 4562 | |
fc51264f | 4563 | template<int size> |
36959681 | 4564 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
4565 | { |
4566 | public: | |
4567 | Target_selector_x86_64() | |
fc51264f | 4568 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
2e702c99 | 4569 | (size == 64 |
fc51264f | 4570 | ? "elf64-x86-64" : "elf32-x86-64"), |
2e702c99 | 4571 | (size == 64 |
fc51264f L |
4572 | ? "elf64-x86-64-freebsd" |
4573 | : "elf32-x86-64-freebsd"), | |
4574 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
4575 | { } |
4576 | ||
4577 | Target* | |
e96caa79 | 4578 | do_instantiate_target() |
fc51264f | 4579 | { return new Target_x86_64<size>(); } |
36959681 | 4580 | |
2e30d253 ILT |
4581 | }; |
4582 | ||
2e702c99 RM |
4583 | // NaCl variant. It uses different PLT contents. |
4584 | ||
4585 | template<int size> | |
4586 | class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size> | |
4587 | { | |
4588 | public: | |
4589 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4590 | Output_data_got<64, false>* got, | |
57b2284c | 4591 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4592 | Output_data_space* got_irelative) |
4593 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4594 | got, got_plt, got_irelative) | |
4595 | { } | |
4596 | ||
4597 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4598 | Output_data_got<64, false>* got, | |
57b2284c | 4599 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4600 | Output_data_space* got_irelative, |
4601 | unsigned int plt_count) | |
4602 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4603 | got, got_plt, got_irelative, | |
4604 | plt_count) | |
4605 | { } | |
4606 | ||
4607 | protected: | |
4608 | virtual unsigned int | |
4609 | do_get_plt_entry_size() const | |
4610 | { return plt_entry_size; } | |
4611 | ||
4612 | virtual void | |
4613 | do_add_eh_frame(Layout* layout) | |
4614 | { | |
4615 | layout->add_eh_frame_for_plt(this, | |
4616 | this->plt_eh_frame_cie, | |
4617 | this->plt_eh_frame_cie_size, | |
4618 | plt_eh_frame_fde, | |
4619 | plt_eh_frame_fde_size); | |
4620 | } | |
4621 | ||
4622 | virtual void | |
4623 | do_fill_first_plt_entry(unsigned char* pov, | |
4624 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
4625 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
4626 | ||
4627 | virtual unsigned int | |
4628 | do_fill_plt_entry(unsigned char* pov, | |
4629 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4630 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4631 | unsigned int got_offset, | |
4632 | unsigned int plt_offset, | |
4633 | unsigned int plt_index); | |
4634 | ||
4635 | virtual void | |
4636 | do_fill_tlsdesc_entry(unsigned char* pov, | |
4637 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4638 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4639 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4640 | unsigned int tlsdesc_got_offset, | |
4641 | unsigned int plt_offset); | |
4642 | ||
4643 | private: | |
4644 | // The size of an entry in the PLT. | |
4645 | static const int plt_entry_size = 64; | |
4646 | ||
4647 | // The first entry in the PLT. | |
4648 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4649 | ||
4650 | // Other entries in the PLT for an executable. | |
4651 | static const unsigned char plt_entry[plt_entry_size]; | |
4652 | ||
4653 | // The reserved TLSDESC entry in the PLT for an executable. | |
4654 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
4655 | ||
4656 | // The .eh_frame unwind information for the PLT. | |
4657 | static const int plt_eh_frame_fde_size = 32; | |
4658 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
4659 | }; | |
4660 | ||
4661 | template<int size> | |
4662 | class Target_x86_64_nacl : public Target_x86_64<size> | |
4663 | { | |
4664 | public: | |
4665 | Target_x86_64_nacl() | |
4666 | : Target_x86_64<size>(&x86_64_nacl_info) | |
4667 | { } | |
4668 | ||
4669 | virtual Output_data_plt_x86_64<size>* | |
4670 | do_make_data_plt(Layout* layout, | |
4671 | Output_data_got<64, false>* got, | |
57b2284c | 4672 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4673 | Output_data_space* got_irelative) |
4674 | { | |
4675 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4676 | got_irelative); | |
4677 | } | |
4678 | ||
4679 | virtual Output_data_plt_x86_64<size>* | |
4680 | do_make_data_plt(Layout* layout, | |
4681 | Output_data_got<64, false>* got, | |
57b2284c | 4682 | Output_data_got_plt_x86_64* got_plt, |
2e702c99 RM |
4683 | Output_data_space* got_irelative, |
4684 | unsigned int plt_count) | |
4685 | { | |
4686 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4687 | got_irelative, | |
4688 | plt_count); | |
4689 | } | |
4690 | ||
93f8221c RM |
4691 | virtual std::string |
4692 | do_code_fill(section_size_type length) const; | |
4693 | ||
2e702c99 RM |
4694 | private: |
4695 | static const Target::Target_info x86_64_nacl_info; | |
4696 | }; | |
4697 | ||
4698 | template<> | |
4699 | const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info = | |
4700 | { | |
4701 | 64, // size | |
4702 | false, // is_big_endian | |
4703 | elfcpp::EM_X86_64, // machine_code | |
4704 | false, // has_make_symbol | |
4705 | false, // has_resolve | |
4706 | true, // has_code_fill | |
4707 | true, // is_default_stack_executable | |
4708 | true, // can_icf_inline_merge_sections | |
4709 | '\0', // wrap_char | |
4710 | "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker | |
4711 | 0x20000, // default_text_segment_address | |
4712 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4713 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4714 | true, // isolate_execinstr | |
4715 | 0x10000000, // rosegment_gap | |
4716 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4717 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4718 | 0, // small_common_section_flags | |
4719 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4720 | NULL, // attributes_section | |
a67858e0 CC |
4721 | NULL, // attributes_vendor |
4722 | "_start" // entry_symbol_name | |
2e702c99 RM |
4723 | }; |
4724 | ||
4725 | template<> | |
4726 | const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info = | |
4727 | { | |
4728 | 32, // size | |
4729 | false, // is_big_endian | |
4730 | elfcpp::EM_X86_64, // machine_code | |
4731 | false, // has_make_symbol | |
4732 | false, // has_resolve | |
4733 | true, // has_code_fill | |
4734 | true, // is_default_stack_executable | |
4735 | true, // can_icf_inline_merge_sections | |
4736 | '\0', // wrap_char | |
4737 | "/lib/ld-nacl-x86-64.so.1", // dynamic_linker | |
4738 | 0x20000, // default_text_segment_address | |
4739 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4740 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4741 | true, // isolate_execinstr | |
4742 | 0x10000000, // rosegment_gap | |
4743 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4744 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4745 | 0, // small_common_section_flags | |
4746 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4747 | NULL, // attributes_section | |
a67858e0 CC |
4748 | NULL, // attributes_vendor |
4749 | "_start" // entry_symbol_name | |
2e702c99 RM |
4750 | }; |
4751 | ||
4752 | #define NACLMASK 0xe0 // 32-byte alignment mask. | |
4753 | ||
4754 | // The first entry in the PLT. | |
4755 | ||
4756 | template<int size> | |
4757 | const unsigned char | |
4758 | Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] = | |
4759 | { | |
4760 | 0xff, 0x35, // pushq contents of memory address | |
4761 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4762 | 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11 | |
4763 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
4764 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4765 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4766 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4767 | ||
4768 | // 9-byte nop sequence to pad out to the next 32-byte boundary. | |
dd0845d7 | 4769 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1) |
2e702c99 RM |
4770 | |
4771 | // 32 bytes of nop to pad out to the standard size | |
4772 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4773 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4774 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4775 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4776 | 0x66, // excess data32 prefix | |
4777 | 0x90 // nop | |
4778 | }; | |
4779 | ||
4780 | template<int size> | |
4781 | void | |
4782 | Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry( | |
4783 | unsigned char* pov, | |
4784 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4785 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
4786 | { | |
4787 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4788 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4789 | (got_address + 8 | |
4790 | - (plt_address + 2 + 4))); | |
4791 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4792 | (got_address + 16 | |
4793 | - (plt_address + 9 + 4))); | |
4794 | } | |
4795 | ||
4796 | // Subsequent entries in the PLT. | |
4797 | ||
4798 | template<int size> | |
4799 | const unsigned char | |
4800 | Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] = | |
4801 | { | |
4802 | 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11 | |
4803 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4804 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4805 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4806 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4807 | ||
4808 | // 15-byte nop sequence to pad out to the next 32-byte boundary. | |
4809 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4810 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4811 | ||
4812 | // Lazy GOT entries point here (32-byte aligned). | |
4813 | 0x68, // pushq immediate | |
4814 | 0, 0, 0, 0, // replaced with index into relocation table | |
4815 | 0xe9, // jmp relative | |
4816 | 0, 0, 0, 0, // replaced with offset to start of .plt0 | |
4817 | ||
4818 | // 22 bytes of nop to pad out to the standard size. | |
4819 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4820 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4821 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax) | |
4822 | }; | |
4823 | ||
4824 | template<int size> | |
4825 | unsigned int | |
4826 | Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry( | |
4827 | unsigned char* pov, | |
4828 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4829 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4830 | unsigned int got_offset, | |
4831 | unsigned int plt_offset, | |
4832 | unsigned int plt_index) | |
4833 | { | |
4834 | memcpy(pov, plt_entry, plt_entry_size); | |
4835 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, | |
4836 | (got_address + got_offset | |
4837 | - (plt_address + plt_offset | |
4838 | + 3 + 4))); | |
4839 | ||
4840 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index); | |
4841 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 38, | |
4842 | - (plt_offset + 38 + 4)); | |
4843 | ||
4844 | return 32; | |
4845 | } | |
4846 | ||
4847 | // The reserved TLSDESC entry in the PLT. | |
4848 | ||
4849 | template<int size> | |
4850 | const unsigned char | |
4851 | Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] = | |
4852 | { | |
4853 | 0xff, 0x35, // pushq x(%rip) | |
4854 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
4855 | 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11 | |
4856 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
4857 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4858 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4859 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4860 | ||
4861 | // 41 bytes of nop to pad out to the standard size. | |
4862 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4863 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4864 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4865 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4866 | 0x66, 0x66, // excess data32 prefixes | |
4867 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4868 | }; | |
4869 | ||
4870 | template<int size> | |
4871 | void | |
4872 | Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry( | |
4873 | unsigned char* pov, | |
4874 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4875 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4876 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4877 | unsigned int tlsdesc_got_offset, | |
4878 | unsigned int plt_offset) | |
4879 | { | |
4880 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
4881 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4882 | (got_address + 8 | |
4883 | - (plt_address + plt_offset | |
4884 | + 2 + 4))); | |
4885 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4886 | (got_base | |
4887 | + tlsdesc_got_offset | |
4888 | - (plt_address + plt_offset | |
4889 | + 9 + 4))); | |
4890 | } | |
4891 | ||
4892 | // The .eh_frame unwind information for the PLT. | |
4893 | ||
4894 | template<int size> | |
4895 | const unsigned char | |
4896 | Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4897 | { | |
4898 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4899 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4900 | 0, // Augmentation size. | |
4901 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
4902 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4903 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
4904 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4905 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4906 | 13, // Block length. | |
4907 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
4908 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
4909 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4910 | elfcpp::DW_OP_and, // & (%rip & 0x3f). | |
4911 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4912 | elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25) | |
4913 | elfcpp::DW_OP_lit3, // Push 3. | |
4914 | elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3) | |
4915 | elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8 | |
4916 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4917 | elfcpp::DW_CFA_nop | |
4918 | }; | |
4919 | ||
93f8221c RM |
4920 | // Return a string used to fill a code section with nops. |
4921 | // For NaCl, long NOPs are only valid if they do not cross | |
4922 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
4923 | template<int size> | |
4924 | std::string | |
4925 | Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const | |
4926 | { | |
4927 | return std::string(length, static_cast<char>(0x90)); | |
4928 | } | |
4929 | ||
2e702c99 RM |
4930 | // The selector for x86_64-nacl object files. |
4931 | ||
4932 | template<int size> | |
4933 | class Target_selector_x86_64_nacl | |
4934 | : public Target_selector_nacl<Target_selector_x86_64<size>, | |
4935 | Target_x86_64_nacl<size> > | |
4936 | { | |
4937 | public: | |
4938 | Target_selector_x86_64_nacl() | |
4939 | : Target_selector_nacl<Target_selector_x86_64<size>, | |
4940 | Target_x86_64_nacl<size> >("x86-64", | |
4941 | size == 64 | |
4942 | ? "elf64-x86-64-nacl" | |
4943 | : "elf32-x86-64-nacl", | |
4944 | size == 64 | |
4945 | ? "elf_x86_64_nacl" | |
4946 | : "elf32_x86_64_nacl") | |
4947 | { } | |
4948 | }; | |
4949 | ||
4950 | Target_selector_x86_64_nacl<64> target_selector_x86_64; | |
4951 | Target_selector_x86_64_nacl<32> target_selector_x32; | |
2e30d253 ILT |
4952 | |
4953 | } // End anonymous namespace. |