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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
4b95cf5c | 3 | // Copyright (C) 2006-2014 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 | ||
7223e9ca | 51 | // A class to handle the PLT data. |
2e702c99 RM |
52 | // This is an abstract base class that handles most of the linker details |
53 | // but does not know the actual contents of PLT entries. The derived | |
54 | // classes below fill in those details. | |
7223e9ca | 55 | |
fc51264f | 56 | template<int size> |
7223e9ca ILT |
57 | class Output_data_plt_x86_64 : public Output_section_data |
58 | { | |
59 | public: | |
fc51264f | 60 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
7223e9ca | 61 | |
2e702c99 RM |
62 | Output_data_plt_x86_64(Layout* layout, uint64_t addralign, |
63 | Output_data_got<64, false>* got, | |
4829d394 | 64 | Output_data_space* got_plt, |
67181c72 | 65 | Output_data_space* got_irelative) |
2e702c99 | 66 | : Output_section_data(addralign), layout_(layout), tlsdesc_rel_(NULL), |
7d172687 ILT |
67 | irelative_rel_(NULL), got_(got), got_plt_(got_plt), |
68 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
69 | tlsdesc_got_offset_(-1U), free_list_() | |
67181c72 ILT |
70 | { this->init(layout); } |
71 | ||
2e702c99 RM |
72 | Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size, |
73 | Output_data_got<64, false>* got, | |
67181c72 ILT |
74 | Output_data_space* got_plt, |
75 | Output_data_space* got_irelative, | |
4829d394 | 76 | unsigned int plt_count) |
2e702c99 RM |
77 | : Output_section_data((plt_count + 1) * plt_entry_size, |
78 | plt_entry_size, false), | |
7d172687 ILT |
79 | layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got), |
80 | got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count), | |
81 | irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_() | |
4829d394 | 82 | { |
67181c72 | 83 | this->init(layout); |
4829d394 CC |
84 | |
85 | // Initialize the free list and reserve the first entry. | |
86 | this->free_list_.init((plt_count + 1) * plt_entry_size, false); | |
87 | this->free_list_.remove(0, plt_entry_size); | |
88 | } | |
89 | ||
90 | // Initialize the PLT section. | |
91 | void | |
67181c72 | 92 | init(Layout* layout); |
7223e9ca ILT |
93 | |
94 | // Add an entry to the PLT. | |
95 | void | |
67181c72 | 96 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
97 | |
98 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
99 | unsigned int | |
67181c72 | 100 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, |
fc51264f | 101 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
102 | unsigned int local_sym_index); |
103 | ||
4829d394 CC |
104 | // Add the relocation for a PLT entry. |
105 | void | |
67181c72 ILT |
106 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, |
107 | unsigned int got_offset); | |
4829d394 | 108 | |
7223e9ca ILT |
109 | // Add the reserved TLSDESC_PLT entry to the PLT. |
110 | void | |
111 | reserve_tlsdesc_entry(unsigned int got_offset) | |
112 | { this->tlsdesc_got_offset_ = got_offset; } | |
113 | ||
114 | // Return true if a TLSDESC_PLT entry has been reserved. | |
115 | bool | |
116 | has_tlsdesc_entry() const | |
117 | { return this->tlsdesc_got_offset_ != -1U; } | |
118 | ||
119 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
120 | unsigned int | |
121 | get_tlsdesc_got_offset() const | |
122 | { return this->tlsdesc_got_offset_; } | |
123 | ||
124 | // Return the offset of the reserved TLSDESC_PLT entry. | |
125 | unsigned int | |
126 | get_tlsdesc_plt_offset() const | |
2e702c99 RM |
127 | { |
128 | return ((this->count_ + this->irelative_count_ + 1) | |
129 | * this->get_plt_entry_size()); | |
130 | } | |
7223e9ca ILT |
131 | |
132 | // Return the .rela.plt section data. | |
133 | Reloc_section* | |
134 | rela_plt() | |
135 | { return this->rel_; } | |
136 | ||
137 | // Return where the TLSDESC relocations should go. | |
138 | Reloc_section* | |
139 | rela_tlsdesc(Layout*); | |
140 | ||
67181c72 ILT |
141 | // Return where the IRELATIVE relocations should go in the PLT |
142 | // relocations. | |
143 | Reloc_section* | |
144 | rela_irelative(Symbol_table*, Layout*); | |
145 | ||
146 | // Return whether we created a section for IRELATIVE relocations. | |
147 | bool | |
148 | has_irelative_section() const | |
149 | { return this->irelative_rel_ != NULL; } | |
150 | ||
7223e9ca ILT |
151 | // Return the number of PLT entries. |
152 | unsigned int | |
153 | entry_count() const | |
67181c72 | 154 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
155 | |
156 | // Return the offset of the first non-reserved PLT entry. | |
2e702c99 | 157 | unsigned int |
7223e9ca | 158 | first_plt_entry_offset() |
2e702c99 | 159 | { return this->get_plt_entry_size(); } |
7223e9ca ILT |
160 | |
161 | // Return the size of a PLT entry. | |
2e702c99 RM |
162 | unsigned int |
163 | get_plt_entry_size() const | |
164 | { return this->do_get_plt_entry_size(); } | |
7223e9ca | 165 | |
4829d394 CC |
166 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
167 | void | |
168 | reserve_slot(unsigned int plt_index) | |
169 | { | |
2e702c99 RM |
170 | this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(), |
171 | (plt_index + 2) * this->get_plt_entry_size()); | |
4829d394 CC |
172 | } |
173 | ||
67181c72 ILT |
174 | // Return the PLT address to use for a global symbol. |
175 | uint64_t | |
176 | address_for_global(const Symbol*); | |
177 | ||
178 | // Return the PLT address to use for a local symbol. | |
179 | uint64_t | |
180 | address_for_local(const Relobj*, unsigned int symndx); | |
181 | ||
2e702c99 RM |
182 | // Add .eh_frame information for the PLT. |
183 | void | |
184 | add_eh_frame(Layout* layout) | |
185 | { this->do_add_eh_frame(layout); } | |
186 | ||
7223e9ca | 187 | protected: |
2e702c99 RM |
188 | // Fill in the first PLT entry. |
189 | void | |
190 | fill_first_plt_entry(unsigned char* pov, | |
191 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
192 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
193 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } | |
194 | ||
195 | // Fill in a normal PLT entry. Returns the offset into the entry that | |
196 | // should be the initial GOT slot value. | |
197 | unsigned int | |
198 | fill_plt_entry(unsigned char* pov, | |
199 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
200 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
201 | unsigned int got_offset, | |
202 | unsigned int plt_offset, | |
203 | unsigned int plt_index) | |
204 | { | |
205 | return this->do_fill_plt_entry(pov, got_address, plt_address, | |
206 | got_offset, plt_offset, plt_index); | |
207 | } | |
208 | ||
209 | // Fill in the reserved TLSDESC PLT entry. | |
210 | void | |
211 | fill_tlsdesc_entry(unsigned char* pov, | |
212 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
213 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
214 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
215 | unsigned int tlsdesc_got_offset, | |
216 | unsigned int plt_offset) | |
217 | { | |
218 | this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base, | |
219 | tlsdesc_got_offset, plt_offset); | |
220 | } | |
221 | ||
222 | virtual unsigned int | |
223 | do_get_plt_entry_size() const = 0; | |
224 | ||
225 | virtual void | |
226 | do_fill_first_plt_entry(unsigned char* pov, | |
227 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
228 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr) | |
229 | = 0; | |
230 | ||
231 | virtual unsigned int | |
232 | do_fill_plt_entry(unsigned char* pov, | |
233 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
234 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
235 | unsigned int got_offset, | |
236 | unsigned int plt_offset, | |
237 | unsigned int plt_index) = 0; | |
238 | ||
239 | virtual void | |
240 | do_fill_tlsdesc_entry(unsigned char* pov, | |
241 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
242 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
243 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
244 | unsigned int tlsdesc_got_offset, | |
245 | unsigned int plt_offset) = 0; | |
246 | ||
247 | virtual void | |
248 | do_add_eh_frame(Layout* layout) = 0; | |
249 | ||
7223e9ca ILT |
250 | void |
251 | do_adjust_output_section(Output_section* os); | |
252 | ||
253 | // Write to a map file. | |
254 | void | |
255 | do_print_to_mapfile(Mapfile* mapfile) const | |
256 | { mapfile->print_output_data(this, _("** PLT")); } | |
257 | ||
2e702c99 | 258 | // The CIE of the .eh_frame unwind information for the PLT. |
07a60597 | 259 | static const int plt_eh_frame_cie_size = 16; |
07a60597 | 260 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
7223e9ca | 261 | |
2e702c99 | 262 | private: |
7223e9ca ILT |
263 | // Set the final size. |
264 | void | |
265 | set_final_data_size(); | |
266 | ||
267 | // Write out the PLT data. | |
268 | void | |
269 | do_write(Output_file*); | |
270 | ||
7d172687 ILT |
271 | // A pointer to the Layout class, so that we can find the .dynamic |
272 | // section when we write out the GOT PLT section. | |
273 | Layout* layout_; | |
7223e9ca ILT |
274 | // The reloc section. |
275 | Reloc_section* rel_; | |
276 | // The TLSDESC relocs, if necessary. These must follow the regular | |
277 | // PLT relocs. | |
278 | Reloc_section* tlsdesc_rel_; | |
67181c72 ILT |
279 | // The IRELATIVE relocs, if necessary. These must follow the |
280 | // regular PLT relocations and the TLSDESC relocations. | |
281 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
282 | // The .got section. |
283 | Output_data_got<64, false>* got_; | |
284 | // The .got.plt section. | |
285 | Output_data_space* got_plt_; | |
67181c72 ILT |
286 | // The part of the .got.plt section used for IRELATIVE relocs. |
287 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
288 | // The number of PLT entries. |
289 | unsigned int count_; | |
67181c72 ILT |
290 | // Number of PLT entries with R_X86_64_IRELATIVE relocs. These |
291 | // follow the regular PLT entries. | |
292 | unsigned int irelative_count_; | |
7223e9ca ILT |
293 | // Offset of the reserved TLSDESC_GOT entry when needed. |
294 | unsigned int tlsdesc_got_offset_; | |
4829d394 CC |
295 | // List of available regions within the section, for incremental |
296 | // update links. | |
297 | Free_list free_list_; | |
7223e9ca | 298 | }; |
2e30d253 | 299 | |
2e702c99 RM |
300 | template<int size> |
301 | class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size> | |
302 | { | |
303 | public: | |
304 | Output_data_plt_x86_64_standard(Layout* layout, | |
305 | Output_data_got<64, false>* got, | |
306 | Output_data_space* got_plt, | |
307 | Output_data_space* got_irelative) | |
308 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
309 | got, got_plt, got_irelative) | |
310 | { } | |
311 | ||
312 | Output_data_plt_x86_64_standard(Layout* layout, | |
313 | Output_data_got<64, false>* got, | |
314 | Output_data_space* got_plt, | |
315 | Output_data_space* got_irelative, | |
316 | unsigned int plt_count) | |
317 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
318 | got, got_plt, got_irelative, | |
319 | plt_count) | |
320 | { } | |
321 | ||
322 | protected: | |
323 | virtual unsigned int | |
324 | do_get_plt_entry_size() const | |
325 | { return plt_entry_size; } | |
326 | ||
327 | virtual void | |
328 | do_add_eh_frame(Layout* layout) | |
329 | { | |
330 | layout->add_eh_frame_for_plt(this, | |
331 | this->plt_eh_frame_cie, | |
332 | this->plt_eh_frame_cie_size, | |
333 | plt_eh_frame_fde, | |
334 | plt_eh_frame_fde_size); | |
335 | } | |
336 | ||
337 | virtual void | |
338 | do_fill_first_plt_entry(unsigned char* pov, | |
339 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
340 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
341 | ||
342 | virtual unsigned int | |
343 | do_fill_plt_entry(unsigned char* pov, | |
344 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
345 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
346 | unsigned int got_offset, | |
347 | unsigned int plt_offset, | |
348 | unsigned int plt_index); | |
349 | ||
350 | virtual void | |
351 | do_fill_tlsdesc_entry(unsigned char* pov, | |
352 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
353 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
354 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
355 | unsigned int tlsdesc_got_offset, | |
356 | unsigned int plt_offset); | |
357 | ||
358 | private: | |
359 | // The size of an entry in the PLT. | |
360 | static const int plt_entry_size = 16; | |
361 | ||
362 | // The first entry in the PLT. | |
363 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
364 | // procedure linkage table for both programs and shared objects." | |
365 | static const unsigned char first_plt_entry[plt_entry_size]; | |
366 | ||
367 | // Other entries in the PLT for an executable. | |
368 | static const unsigned char plt_entry[plt_entry_size]; | |
369 | ||
370 | // The reserved TLSDESC entry in the PLT for an executable. | |
371 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
372 | ||
373 | // The .eh_frame unwind information for the PLT. | |
374 | static const int plt_eh_frame_fde_size = 32; | |
375 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
376 | }; | |
377 | ||
2e30d253 | 378 | // The x86_64 target class. |
d61c17ea ILT |
379 | // See the ABI at |
380 | // http://www.x86-64.org/documentation/abi.pdf | |
381 | // TLS info comes from | |
382 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 383 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 384 | |
fc51264f L |
385 | template<int size> |
386 | class Target_x86_64 : public Sized_target<size, false> | |
2e30d253 ILT |
387 | { |
388 | public: | |
e822f2b1 ILT |
389 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
390 | // uses only Elf64_Rela relocation entries with explicit addends." | |
fc51264f | 391 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
2e30d253 | 392 | |
2e702c99 RM |
393 | Target_x86_64(const Target::Target_info* info = &x86_64_info) |
394 | : Sized_target<size, false>(info), | |
67181c72 ILT |
395 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
396 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
397 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), | |
43819297 | 398 | got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), |
e291e7b9 | 399 | tls_base_symbol_defined_(false) |
2e30d253 ILT |
400 | { } |
401 | ||
8a5e3e08 ILT |
402 | // Hook for a new output section. |
403 | void | |
404 | do_new_output_section(Output_section*) const; | |
405 | ||
6d03d481 ST |
406 | // Scan the relocations to look for symbol adjustments. |
407 | void | |
ad0f2072 | 408 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
409 | Layout* layout, |
410 | Sized_relobj_file<size, false>* object, | |
411 | unsigned int data_shndx, | |
412 | unsigned int sh_type, | |
413 | const unsigned char* prelocs, | |
414 | size_t reloc_count, | |
415 | Output_section* output_section, | |
416 | bool needs_special_offset_handling, | |
417 | size_t local_symbol_count, | |
418 | const unsigned char* plocal_symbols); | |
6d03d481 | 419 | |
2e30d253 ILT |
420 | // Scan the relocations to look for symbol adjustments. |
421 | void | |
ad0f2072 | 422 | scan_relocs(Symbol_table* symtab, |
2e30d253 | 423 | Layout* layout, |
fc51264f | 424 | Sized_relobj_file<size, false>* object, |
2e30d253 ILT |
425 | unsigned int data_shndx, |
426 | unsigned int sh_type, | |
427 | const unsigned char* prelocs, | |
428 | size_t reloc_count, | |
730cdc88 ILT |
429 | Output_section* output_section, |
430 | bool needs_special_offset_handling, | |
2e30d253 | 431 | size_t local_symbol_count, |
730cdc88 | 432 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
433 | |
434 | // Finalize the sections. | |
435 | void | |
f59f41f3 | 436 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 437 | |
4fb6c25d ILT |
438 | // Return the value to use for a dynamic which requires special |
439 | // treatment. | |
440 | uint64_t | |
441 | do_dynsym_value(const Symbol*) const; | |
442 | ||
2e30d253 ILT |
443 | // Relocate a section. |
444 | void | |
fc51264f | 445 | relocate_section(const Relocate_info<size, false>*, |
2e30d253 ILT |
446 | unsigned int sh_type, |
447 | const unsigned char* prelocs, | |
448 | size_t reloc_count, | |
730cdc88 ILT |
449 | Output_section* output_section, |
450 | bool needs_special_offset_handling, | |
2e30d253 | 451 | unsigned char* view, |
fc51264f | 452 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
364c7fa5 ILT |
453 | section_size_type view_size, |
454 | const Reloc_symbol_changes*); | |
2e30d253 | 455 | |
6a74a719 ILT |
456 | // Scan the relocs during a relocatable link. |
457 | void | |
ad0f2072 | 458 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 459 | Layout* layout, |
fc51264f | 460 | Sized_relobj_file<size, false>* object, |
6a74a719 ILT |
461 | unsigned int data_shndx, |
462 | unsigned int sh_type, | |
463 | const unsigned char* prelocs, | |
464 | size_t reloc_count, | |
465 | Output_section* output_section, | |
466 | bool needs_special_offset_handling, | |
467 | size_t local_symbol_count, | |
468 | const unsigned char* plocal_symbols, | |
469 | Relocatable_relocs*); | |
470 | ||
7404fe1b | 471 | // Emit relocations for a section. |
6a74a719 | 472 | void |
7404fe1b | 473 | relocate_relocs( |
fc51264f L |
474 | const Relocate_info<size, false>*, |
475 | unsigned int sh_type, | |
476 | const unsigned char* prelocs, | |
477 | size_t reloc_count, | |
478 | Output_section* output_section, | |
62fe925a | 479 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
fc51264f L |
480 | const Relocatable_relocs*, |
481 | unsigned char* view, | |
482 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
483 | section_size_type view_size, | |
484 | unsigned char* reloc_view, | |
485 | section_size_type reloc_view_size); | |
6a74a719 | 486 | |
2e30d253 ILT |
487 | // Return a string used to fill a code section with nops. |
488 | std::string | |
8851ecca | 489 | do_code_fill(section_size_type length) const; |
2e30d253 | 490 | |
9a2d6984 ILT |
491 | // Return whether SYM is defined by the ABI. |
492 | bool | |
9c2d0ef9 | 493 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
494 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
495 | ||
e291e7b9 ILT |
496 | // Return the symbol index to use for a target specific relocation. |
497 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
498 | // local symbol, which is an absolute reloc. | |
499 | unsigned int | |
500 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
501 | { | |
502 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
503 | return 0; | |
504 | } | |
505 | ||
506 | // Return the addend to use for a target specific relocation. | |
507 | uint64_t | |
508 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
509 | ||
7223e9ca | 510 | // Return the PLT section. |
67181c72 ILT |
511 | uint64_t |
512 | do_plt_address_for_global(const Symbol* gsym) const | |
513 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 514 | |
67181c72 ILT |
515 | uint64_t |
516 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
517 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 518 | |
b3ce541e ILT |
519 | // This function should be defined in targets that can use relocation |
520 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
521 | // and global_reloc_may_be_function_pointer) | |
522 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
523 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
524 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
525 | bool | |
526 | do_can_check_for_function_pointers() const | |
527 | { return !parameters->options().pie(); } | |
528 | ||
02d7cd44 ILT |
529 | // Return the base for a DW_EH_PE_datarel encoding. |
530 | uint64_t | |
531 | do_ehframe_datarel_base() const; | |
532 | ||
9b547ce6 | 533 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
534 | void |
535 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
536 | section_offset_type fnoffset, section_size_type fnsize, | |
537 | unsigned char* view, section_size_type view_size, | |
538 | std::string* from, std::string* to) const; | |
539 | ||
96f2030e | 540 | // Return the size of the GOT section. |
fe8718a4 | 541 | section_size_type |
0e70b911 | 542 | got_size() const |
96f2030e ILT |
543 | { |
544 | gold_assert(this->got_ != NULL); | |
545 | return this->got_->data_size(); | |
546 | } | |
547 | ||
0e70b911 CC |
548 | // Return the number of entries in the GOT. |
549 | unsigned int | |
550 | got_entry_count() const | |
551 | { | |
552 | if (this->got_ == NULL) | |
553 | return 0; | |
554 | return this->got_size() / 8; | |
555 | } | |
556 | ||
557 | // Return the number of entries in the PLT. | |
558 | unsigned int | |
559 | plt_entry_count() const; | |
560 | ||
561 | // Return the offset of the first non-reserved PLT entry. | |
562 | unsigned int | |
563 | first_plt_entry_offset() const; | |
564 | ||
565 | // Return the size of each PLT entry. | |
566 | unsigned int | |
567 | plt_entry_size() const; | |
568 | ||
4829d394 | 569 | // Create the GOT section for an incremental update. |
dd74ae06 | 570 | Output_data_got_base* |
4829d394 CC |
571 | init_got_plt_for_update(Symbol_table* symtab, |
572 | Layout* layout, | |
573 | unsigned int got_count, | |
574 | unsigned int plt_count); | |
575 | ||
6fa2a40b CC |
576 | // Reserve a GOT entry for a local symbol, and regenerate any |
577 | // necessary dynamic relocations. | |
578 | void | |
579 | reserve_local_got_entry(unsigned int got_index, | |
2e702c99 | 580 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
581 | unsigned int r_sym, |
582 | unsigned int got_type); | |
583 | ||
584 | // Reserve a GOT entry for a global symbol, and regenerate any | |
585 | // necessary dynamic relocations. | |
586 | void | |
587 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
588 | unsigned int got_type); | |
589 | ||
4829d394 | 590 | // Register an existing PLT entry for a global symbol. |
4829d394 | 591 | void |
67181c72 ILT |
592 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
593 | Symbol* gsym); | |
4829d394 | 594 | |
26d3c67d CC |
595 | // Force a COPY relocation for a given symbol. |
596 | void | |
597 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
598 | ||
94a3fc8b CC |
599 | // Apply an incremental relocation. |
600 | void | |
fc51264f L |
601 | apply_relocation(const Relocate_info<size, false>* relinfo, |
602 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 603 | unsigned int r_type, |
fc51264f | 604 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
605 | const Symbol* gsym, |
606 | unsigned char* view, | |
fc51264f | 607 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
608 | section_size_type view_size); |
609 | ||
e291e7b9 ILT |
610 | // Add a new reloc argument, returning the index in the vector. |
611 | size_t | |
fc51264f | 612 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
613 | { |
614 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
615 | return this->tlsdesc_reloc_info_.size() - 1; | |
616 | } | |
617 | ||
2e702c99 RM |
618 | Output_data_plt_x86_64<size>* |
619 | make_data_plt(Layout* layout, | |
620 | Output_data_got<64, false>* got, | |
621 | Output_data_space* got_plt, | |
622 | Output_data_space* got_irelative) | |
623 | { | |
624 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); | |
625 | } | |
626 | ||
627 | Output_data_plt_x86_64<size>* | |
628 | make_data_plt(Layout* layout, | |
629 | Output_data_got<64, false>* got, | |
630 | Output_data_space* got_plt, | |
631 | Output_data_space* got_irelative, | |
632 | unsigned int plt_count) | |
633 | { | |
634 | return this->do_make_data_plt(layout, got, got_plt, got_irelative, | |
635 | plt_count); | |
636 | } | |
637 | ||
638 | virtual Output_data_plt_x86_64<size>* | |
639 | do_make_data_plt(Layout* layout, | |
640 | Output_data_got<64, false>* got, | |
641 | Output_data_space* got_plt, | |
642 | Output_data_space* got_irelative) | |
643 | { | |
644 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
645 | got_irelative); | |
646 | } | |
647 | ||
648 | virtual Output_data_plt_x86_64<size>* | |
649 | do_make_data_plt(Layout* layout, | |
650 | Output_data_got<64, false>* got, | |
651 | Output_data_space* got_plt, | |
652 | Output_data_space* got_irelative, | |
653 | unsigned int plt_count) | |
654 | { | |
655 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
656 | got_irelative, | |
657 | plt_count); | |
658 | } | |
659 | ||
2e30d253 ILT |
660 | private: |
661 | // The class which scans relocations. | |
a036edd8 | 662 | class Scan |
2e30d253 | 663 | { |
a036edd8 ILT |
664 | public: |
665 | Scan() | |
666 | : issued_non_pic_error_(false) | |
667 | { } | |
668 | ||
95a2c8d6 RS |
669 | static inline int |
670 | get_reference_flags(unsigned int r_type); | |
671 | ||
2e30d253 | 672 | inline void |
ad0f2072 | 673 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 674 | Sized_relobj_file<size, false>* object, |
2e30d253 | 675 | unsigned int data_shndx, |
07f397ab | 676 | Output_section* output_section, |
fc51264f | 677 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
bfdfa4cd AM |
678 | const elfcpp::Sym<size, false>& lsym, |
679 | bool is_discarded); | |
2e30d253 ILT |
680 | |
681 | inline void | |
ad0f2072 | 682 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 683 | Sized_relobj_file<size, false>* object, |
2e30d253 | 684 | unsigned int data_shndx, |
07f397ab | 685 | Output_section* output_section, |
fc51264f | 686 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
2e30d253 | 687 | Symbol* gsym); |
e041f13d | 688 | |
21bb3914 ST |
689 | inline bool |
690 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
691 | Target_x86_64* target, | |
2e702c99 RM |
692 | Sized_relobj_file<size, false>* object, |
693 | unsigned int data_shndx, | |
694 | Output_section* output_section, | |
695 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 696 | unsigned int r_type, |
2e702c99 | 697 | const elfcpp::Sym<size, false>& lsym); |
21bb3914 ST |
698 | |
699 | inline bool | |
700 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
2e702c99 RM |
701 | Target_x86_64* target, |
702 | Sized_relobj_file<size, false>* object, | |
703 | unsigned int data_shndx, | |
704 | Output_section* output_section, | |
705 | const elfcpp::Rela<size, false>& reloc, | |
21bb3914 | 706 | unsigned int r_type, |
2e702c99 | 707 | Symbol* gsym); |
21bb3914 | 708 | |
a036edd8 | 709 | private: |
e041f13d | 710 | static void |
fc51264f L |
711 | unsupported_reloc_local(Sized_relobj_file<size, false>*, |
712 | unsigned int r_type); | |
e041f13d ILT |
713 | |
714 | static void | |
fc51264f L |
715 | unsupported_reloc_global(Sized_relobj_file<size, false>*, |
716 | unsigned int r_type, Symbol*); | |
a036edd8 ILT |
717 | |
718 | void | |
a29b0dad | 719 | check_non_pic(Relobj*, unsigned int r_type, Symbol*); |
a036edd8 | 720 | |
21bb3914 ST |
721 | inline bool |
722 | possible_function_pointer_reloc(unsigned int r_type); | |
723 | ||
7223e9ca | 724 | bool |
fc51264f | 725 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*, |
6fa2a40b | 726 | unsigned int r_type); |
7223e9ca | 727 | |
a036edd8 ILT |
728 | // Whether we have issued an error about a non-PIC compilation. |
729 | bool issued_non_pic_error_; | |
2e30d253 ILT |
730 | }; |
731 | ||
732 | // The class which implements relocation. | |
733 | class Relocate | |
734 | { | |
735 | public: | |
736 | Relocate() | |
36171d64 | 737 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
738 | { } |
739 | ||
740 | ~Relocate() | |
741 | { | |
742 | if (this->skip_call_tls_get_addr_) | |
743 | { | |
744 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 745 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
746 | } |
747 | } | |
748 | ||
749 | // Do a relocation. Return false if the caller should not issue | |
750 | // any warnings about this relocation. | |
751 | inline bool | |
fc51264f L |
752 | relocate(const Relocate_info<size, false>*, Target_x86_64*, |
753 | Output_section*, | |
754 | size_t relnum, const elfcpp::Rela<size, false>&, | |
755 | unsigned int r_type, const Sized_symbol<size>*, | |
756 | const Symbol_value<size>*, | |
757 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 758 | section_size_type); |
2e30d253 ILT |
759 | |
760 | private: | |
761 | // Do a TLS relocation. | |
762 | inline void | |
fc51264f | 763 | relocate_tls(const Relocate_info<size, false>*, Target_x86_64*, |
2e702c99 | 764 | size_t relnum, const elfcpp::Rela<size, false>&, |
fc51264f L |
765 | unsigned int r_type, const Sized_symbol<size>*, |
766 | const Symbol_value<size>*, | |
767 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 768 | section_size_type); |
2e30d253 | 769 | |
c2b45e22 | 770 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 | 771 | inline void |
fc51264f | 772 | tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
7bf1f802 | 773 | Output_segment* tls_segment, |
fc51264f L |
774 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
775 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
7bf1f802 | 776 | unsigned char* view, |
fc51264f | 777 | typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 778 | section_size_type view_size); |
7bf1f802 | 779 | |
56622147 ILT |
780 | // Do a TLS General-Dynamic to Local-Exec transition. |
781 | inline void | |
fc51264f | 782 | tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 783 | Output_segment* tls_segment, |
fc51264f L |
784 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
785 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 786 | unsigned char* view, |
fe8718a4 | 787 | section_size_type view_size); |
2e30d253 | 788 | |
c2b45e22 CC |
789 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
790 | inline void | |
fc51264f | 791 | tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 792 | Output_segment* tls_segment, |
fc51264f L |
793 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
794 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 | 795 | unsigned char* view, |
fc51264f | 796 | typename elfcpp::Elf_types<size>::Elf_Addr, |
c2b45e22 CC |
797 | section_size_type view_size); |
798 | ||
799 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
800 | inline void | |
fc51264f | 801 | tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 802 | Output_segment* tls_segment, |
fc51264f L |
803 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
804 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 CC |
805 | unsigned char* view, |
806 | section_size_type view_size); | |
807 | ||
56622147 | 808 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 809 | inline void |
fc51264f | 810 | tls_ld_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 | |
56622147 ILT |
817 | // Do a TLS Initial-Exec to Local-Exec transition. |
818 | static inline void | |
fc51264f | 819 | tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum, |
72ec2876 | 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, | |
72ec2876 | 823 | unsigned char* view, |
fe8718a4 | 824 | section_size_type view_size); |
2e30d253 ILT |
825 | |
826 | // This is set if we should skip the next reloc, which should be a | |
827 | // PLT32 reloc against ___tls_get_addr. | |
828 | bool skip_call_tls_get_addr_; | |
829 | }; | |
830 | ||
6a74a719 ILT |
831 | // A class which returns the size required for a relocation type, |
832 | // used while scanning relocs during a relocatable link. | |
833 | class Relocatable_size_for_reloc | |
834 | { | |
835 | public: | |
836 | unsigned int | |
837 | get_size_for_reloc(unsigned int, Relobj*); | |
838 | }; | |
839 | ||
2e30d253 ILT |
840 | // Adjust TLS relocation type based on the options and whether this |
841 | // is a local symbol. | |
e041f13d | 842 | static tls::Tls_optimization |
2e30d253 ILT |
843 | optimize_tls_reloc(bool is_final, int r_type); |
844 | ||
845 | // Get the GOT section, creating it if necessary. | |
846 | Output_data_got<64, false>* | |
847 | got_section(Symbol_table*, Layout*); | |
848 | ||
96f2030e ILT |
849 | // Get the GOT PLT section. |
850 | Output_data_space* | |
851 | got_plt_section() const | |
852 | { | |
853 | gold_assert(this->got_plt_ != NULL); | |
854 | return this->got_plt_; | |
855 | } | |
856 | ||
a8df5856 ILT |
857 | // Get the GOT section for TLSDESC entries. |
858 | Output_data_got<64, false>* | |
859 | got_tlsdesc_section() const | |
860 | { | |
861 | gold_assert(this->got_tlsdesc_ != NULL); | |
862 | return this->got_tlsdesc_; | |
863 | } | |
864 | ||
c2b45e22 CC |
865 | // Create the PLT section. |
866 | void | |
867 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
868 | ||
2e30d253 ILT |
869 | // Create a PLT entry for a global symbol. |
870 | void | |
871 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
872 | ||
7223e9ca ILT |
873 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
874 | void | |
875 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
fc51264f | 876 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
877 | unsigned int local_sym_index); |
878 | ||
9fa33bee | 879 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
880 | void |
881 | define_tls_base_symbol(Symbol_table*, Layout*); | |
882 | ||
c2b45e22 CC |
883 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
884 | void | |
885 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
886 | ||
31d60480 ILT |
887 | // Create a GOT entry for the TLS module index. |
888 | unsigned int | |
889 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
fc51264f | 890 | Sized_relobj_file<size, false>* object); |
31d60480 | 891 | |
2e30d253 | 892 | // Get the PLT section. |
fc51264f | 893 | Output_data_plt_x86_64<size>* |
2e30d253 ILT |
894 | plt_section() const |
895 | { | |
896 | gold_assert(this->plt_ != NULL); | |
897 | return this->plt_; | |
898 | } | |
899 | ||
900 | // Get the dynamic reloc section, creating it if necessary. | |
901 | Reloc_section* | |
0ffd9845 | 902 | rela_dyn_section(Layout*); |
2e30d253 | 903 | |
e291e7b9 ILT |
904 | // Get the section to use for TLSDESC relocations. |
905 | Reloc_section* | |
906 | rela_tlsdesc_section(Layout*) const; | |
907 | ||
67181c72 ILT |
908 | // Get the section to use for IRELATIVE relocations. |
909 | Reloc_section* | |
910 | rela_irelative_section(Layout*); | |
911 | ||
12c0daef | 912 | // Add a potential copy relocation. |
2e30d253 | 913 | void |
ef9beddf | 914 | copy_reloc(Symbol_table* symtab, Layout* layout, |
2e702c99 | 915 | Sized_relobj_file<size, false>* object, |
12c0daef | 916 | unsigned int shndx, Output_section* output_section, |
fc51264f | 917 | Symbol* sym, const elfcpp::Rela<size, false>& reloc) |
12c0daef ILT |
918 | { |
919 | this->copy_relocs_.copy_reloc(symtab, layout, | |
fc51264f | 920 | symtab->get_sized_symbol<size>(sym), |
12c0daef ILT |
921 | object, shndx, output_section, |
922 | reloc, this->rela_dyn_section(layout)); | |
923 | } | |
2e30d253 ILT |
924 | |
925 | // Information about this specific target which we pass to the | |
926 | // general Target structure. | |
927 | static const Target::Target_info x86_64_info; | |
928 | ||
0e70b911 CC |
929 | // The types of GOT entries needed for this platform. |
930 | // These values are exposed to the ABI in an incremental link. | |
931 | // Do not renumber existing values without changing the version | |
932 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
933 | enum Got_type |
934 | { | |
935 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
936 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
937 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
938 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
939 | }; | |
940 | ||
e291e7b9 ILT |
941 | // This type is used as the argument to the target specific |
942 | // relocation routines. The only target specific reloc is | |
943 | // R_X86_64_TLSDESC against a local symbol. | |
944 | struct Tlsdesc_info | |
945 | { | |
fc51264f | 946 | Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym) |
e291e7b9 ILT |
947 | : object(a_object), r_sym(a_r_sym) |
948 | { } | |
949 | ||
950 | // The object in which the local symbol is defined. | |
fc51264f | 951 | Sized_relobj_file<size, false>* object; |
e291e7b9 ILT |
952 | // The local symbol index in the object. |
953 | unsigned int r_sym; | |
954 | }; | |
955 | ||
2e30d253 ILT |
956 | // The GOT section. |
957 | Output_data_got<64, false>* got_; | |
958 | // The PLT section. | |
fc51264f | 959 | Output_data_plt_x86_64<size>* plt_; |
2e30d253 ILT |
960 | // The GOT PLT section. |
961 | Output_data_space* got_plt_; | |
67181c72 ILT |
962 | // The GOT section for IRELATIVE relocations. |
963 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
964 | // The GOT section for TLSDESC relocations. |
965 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
966 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
967 | Symbol* global_offset_table_; | |
2e30d253 | 968 | // The dynamic reloc section. |
0ffd9845 | 969 | Reloc_section* rela_dyn_; |
67181c72 ILT |
970 | // The section to use for IRELATIVE relocs. |
971 | Reloc_section* rela_irelative_; | |
2e30d253 | 972 | // Relocs saved to avoid a COPY reloc. |
fc51264f | 973 | Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_; |
c2b45e22 | 974 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 975 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
976 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
977 | // specific relocation. Here we store the object and local symbol | |
978 | // index for the relocation. | |
979 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
980 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
981 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
982 | }; |
983 | ||
fc51264f L |
984 | template<> |
985 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
986 | { |
987 | 64, // size | |
988 | false, // is_big_endian | |
989 | elfcpp::EM_X86_64, // machine_code | |
990 | false, // has_make_symbol | |
991 | false, // has_resolve | |
992 | true, // has_code_fill | |
35cdfc9a | 993 | true, // is_default_stack_executable |
b3ce541e | 994 | true, // can_icf_inline_merge_sections |
0864d551 | 995 | '\0', // wrap_char |
2e30d253 | 996 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 997 | 0x400000, // default_text_segment_address |
cd72c291 | 998 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 999 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
1000 | false, // isolate_execinstr |
1001 | 0, // rosegment_gap | |
8a5e3e08 ILT |
1002 | elfcpp::SHN_UNDEF, // small_common_shndx |
1003 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1004 | 0, // small_common_section_flags | |
05a352e6 DK |
1005 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
1006 | NULL, // attributes_section | |
a67858e0 CC |
1007 | NULL, // attributes_vendor |
1008 | "_start" // entry_symbol_name | |
2e30d253 ILT |
1009 | }; |
1010 | ||
fc51264f L |
1011 | template<> |
1012 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
1013 | { | |
1014 | 32, // size | |
1015 | false, // is_big_endian | |
1016 | elfcpp::EM_X86_64, // machine_code | |
1017 | false, // has_make_symbol | |
1018 | false, // has_resolve | |
1019 | true, // has_code_fill | |
1020 | true, // is_default_stack_executable | |
1021 | true, // can_icf_inline_merge_sections | |
1022 | '\0', // wrap_char | |
1023 | "/libx32/ldx32.so.1", // program interpreter | |
1024 | 0x400000, // default_text_segment_address | |
1025 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
1026 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2e702c99 RM |
1027 | false, // isolate_execinstr |
1028 | 0, // rosegment_gap | |
fc51264f L |
1029 | elfcpp::SHN_UNDEF, // small_common_shndx |
1030 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1031 | 0, // small_common_section_flags | |
1032 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
1033 | NULL, // attributes_section | |
a67858e0 CC |
1034 | NULL, // attributes_vendor |
1035 | "_start" // entry_symbol_name | |
fc51264f L |
1036 | }; |
1037 | ||
8a5e3e08 ILT |
1038 | // This is called when a new output section is created. This is where |
1039 | // we handle the SHF_X86_64_LARGE. | |
1040 | ||
fc51264f | 1041 | template<int size> |
8a5e3e08 | 1042 | void |
fc51264f | 1043 | Target_x86_64<size>::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
1044 | { |
1045 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
1046 | os->set_is_large_section(); | |
1047 | } | |
1048 | ||
2e30d253 ILT |
1049 | // Get the GOT section, creating it if necessary. |
1050 | ||
fc51264f | 1051 | template<int size> |
2e30d253 | 1052 | Output_data_got<64, false>* |
fc51264f | 1053 | Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout) |
2e30d253 ILT |
1054 | { |
1055 | if (this->got_ == NULL) | |
1056 | { | |
1057 | gold_assert(symtab != NULL && layout != NULL); | |
1058 | ||
9446efde ILT |
1059 | // When using -z now, we can treat .got.plt as a relro section. |
1060 | // Without -z now, it is modified after program startup by lazy | |
1061 | // PLT relocations. | |
1062 | bool is_got_plt_relro = parameters->options().now(); | |
1063 | Output_section_order got_order = (is_got_plt_relro | |
1064 | ? ORDER_RELRO | |
1065 | : ORDER_RELRO_LAST); | |
1066 | Output_section_order got_plt_order = (is_got_plt_relro | |
1067 | ? ORDER_RELRO | |
1068 | : ORDER_NON_RELRO_FIRST); | |
1069 | ||
2e30d253 ILT |
1070 | this->got_ = new Output_data_got<64, false>(); |
1071 | ||
82742395 ILT |
1072 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
1073 | (elfcpp::SHF_ALLOC | |
1074 | | elfcpp::SHF_WRITE), | |
9446efde | 1075 | this->got_, got_order, true); |
2e30d253 | 1076 | |
7d9e3d98 | 1077 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
1078 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
1079 | (elfcpp::SHF_ALLOC | |
1080 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
1081 | this->got_plt_, got_plt_order, |
1082 | is_got_plt_relro); | |
2e30d253 ILT |
1083 | |
1084 | // The first three entries are reserved. | |
27bc2bce | 1085 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 1086 | |
9446efde ILT |
1087 | if (!is_got_plt_relro) |
1088 | { | |
1089 | // Those bytes can go into the relro segment. | |
1090 | layout->increase_relro(3 * 8); | |
1091 | } | |
1a2dff53 | 1092 | |
2e30d253 | 1093 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
1094 | this->global_offset_table_ = |
1095 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1096 | Symbol_table::PREDEFINED, | |
1097 | this->got_plt_, | |
1098 | 0, 0, elfcpp::STT_OBJECT, | |
1099 | elfcpp::STB_LOCAL, | |
1100 | elfcpp::STV_HIDDEN, 0, | |
1101 | false, false); | |
a8df5856 | 1102 | |
67181c72 ILT |
1103 | // If there are any IRELATIVE relocations, they get GOT entries |
1104 | // in .got.plt after the jump slot entries. | |
1105 | this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT"); | |
1106 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1107 | (elfcpp::SHF_ALLOC | |
1108 | | elfcpp::SHF_WRITE), | |
1109 | this->got_irelative_, | |
9446efde | 1110 | got_plt_order, is_got_plt_relro); |
67181c72 | 1111 | |
a8df5856 | 1112 | // If there are any TLSDESC relocations, they get GOT entries in |
67181c72 | 1113 | // .got.plt after the jump slot and IRELATIVE entries. |
a8df5856 ILT |
1114 | this->got_tlsdesc_ = new Output_data_got<64, false>(); |
1115 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1116 | (elfcpp::SHF_ALLOC | |
1117 | | elfcpp::SHF_WRITE), | |
22f0da72 | 1118 | this->got_tlsdesc_, |
9446efde | 1119 | got_plt_order, is_got_plt_relro); |
2e30d253 ILT |
1120 | } |
1121 | ||
1122 | return this->got_; | |
1123 | } | |
1124 | ||
1125 | // Get the dynamic reloc section, creating it if necessary. | |
1126 | ||
fc51264f L |
1127 | template<int size> |
1128 | typename Target_x86_64<size>::Reloc_section* | |
1129 | Target_x86_64<size>::rela_dyn_section(Layout* layout) | |
2e30d253 | 1130 | { |
0ffd9845 | 1131 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
1132 | { |
1133 | gold_assert(layout != NULL); | |
d98bc257 | 1134 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 1135 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
1136 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
1137 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 1138 | } |
0ffd9845 | 1139 | return this->rela_dyn_; |
2e30d253 ILT |
1140 | } |
1141 | ||
67181c72 ILT |
1142 | // Get the section to use for IRELATIVE relocs, creating it if |
1143 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
1144 | // relocations. They need to follow the other dynamic relocations so | |
1145 | // that they can refer to global variables initialized by those | |
1146 | // relocs. | |
1147 | ||
fc51264f L |
1148 | template<int size> |
1149 | typename Target_x86_64<size>::Reloc_section* | |
1150 | Target_x86_64<size>::rela_irelative_section(Layout* layout) | |
67181c72 ILT |
1151 | { |
1152 | if (this->rela_irelative_ == NULL) | |
1153 | { | |
1154 | // Make sure we have already created the dynamic reloc section. | |
1155 | this->rela_dyn_section(layout); | |
1156 | this->rela_irelative_ = new Reloc_section(false); | |
1157 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
1158 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
1159 | ORDER_DYNAMIC_RELOCS, false); | |
1160 | gold_assert(this->rela_dyn_->output_section() | |
1161 | == this->rela_irelative_->output_section()); | |
1162 | } | |
1163 | return this->rela_irelative_; | |
1164 | } | |
1165 | ||
4829d394 | 1166 | // Initialize the PLT section. |
2e30d253 | 1167 | |
fc51264f | 1168 | template<int size> |
4829d394 | 1169 | void |
fc51264f | 1170 | Output_data_plt_x86_64<size>::init(Layout* layout) |
2e30d253 | 1171 | { |
d98bc257 | 1172 | this->rel_ = new Reloc_section(false); |
2e30d253 | 1173 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
1174 | elfcpp::SHF_ALLOC, this->rel_, |
1175 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
2e30d253 ILT |
1176 | } |
1177 | ||
fc51264f | 1178 | template<int size> |
2e30d253 | 1179 | void |
fc51264f | 1180 | Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os) |
2e30d253 | 1181 | { |
2e702c99 | 1182 | os->set_entsize(this->get_plt_entry_size()); |
2e30d253 ILT |
1183 | } |
1184 | ||
1185 | // Add an entry to the PLT. | |
1186 | ||
fc51264f | 1187 | template<int size> |
2e30d253 | 1188 | void |
fc51264f L |
1189 | Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout, |
1190 | Symbol* gsym) | |
2e30d253 ILT |
1191 | { |
1192 | gold_assert(!gsym->has_plt_offset()); | |
1193 | ||
4829d394 CC |
1194 | unsigned int plt_index; |
1195 | off_t plt_offset; | |
1196 | section_offset_type got_offset; | |
2e30d253 | 1197 | |
67181c72 ILT |
1198 | unsigned int* pcount; |
1199 | unsigned int offset; | |
1200 | unsigned int reserved; | |
1201 | Output_data_space* got; | |
1202 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1203 | && gsym->can_use_relative_reloc(false)) | |
1204 | { | |
1205 | pcount = &this->irelative_count_; | |
1206 | offset = 0; | |
1207 | reserved = 0; | |
1208 | got = this->got_irelative_; | |
1209 | } | |
1210 | else | |
1211 | { | |
1212 | pcount = &this->count_; | |
1213 | offset = 1; | |
1214 | reserved = 3; | |
1215 | got = this->got_plt_; | |
1216 | } | |
1217 | ||
4829d394 CC |
1218 | if (!this->is_data_size_valid()) |
1219 | { | |
67181c72 ILT |
1220 | // Note that when setting the PLT offset for a non-IRELATIVE |
1221 | // entry we skip the initial reserved PLT entry. | |
1222 | plt_index = *pcount + offset; | |
2e702c99 | 1223 | plt_offset = plt_index * this->get_plt_entry_size(); |
2e30d253 | 1224 | |
67181c72 | 1225 | ++*pcount; |
2e30d253 | 1226 | |
67181c72 ILT |
1227 | got_offset = (plt_index - offset + reserved) * 8; |
1228 | gold_assert(got_offset == got->current_data_size()); | |
2e30d253 | 1229 | |
4829d394 CC |
1230 | // Every PLT entry needs a GOT entry which points back to the PLT |
1231 | // entry (this will be changed by the dynamic linker, normally | |
1232 | // lazily when the function is called). | |
67181c72 | 1233 | got->set_current_data_size(got_offset + 8); |
4829d394 | 1234 | } |
7223e9ca ILT |
1235 | else |
1236 | { | |
67181c72 ILT |
1237 | // FIXME: This is probably not correct for IRELATIVE relocs. |
1238 | ||
4829d394 | 1239 | // For incremental updates, find an available slot. |
2e702c99 RM |
1240 | plt_offset = this->free_list_.allocate(this->get_plt_entry_size(), |
1241 | this->get_plt_entry_size(), 0); | |
4829d394 | 1242 | if (plt_offset == -1) |
e6455dfb CC |
1243 | gold_fallback(_("out of patch space (PLT);" |
1244 | " relink with --incremental-full")); | |
4829d394 CC |
1245 | |
1246 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
1247 | // can be calculated from the PLT index, adjusting for the three | |
1248 | // reserved entries at the beginning of the GOT. | |
2e702c99 | 1249 | plt_index = plt_offset / this->get_plt_entry_size() - 1; |
67181c72 | 1250 | got_offset = (plt_index - offset + reserved) * 8; |
7223e9ca | 1251 | } |
2e30d253 | 1252 | |
4829d394 CC |
1253 | gsym->set_plt_offset(plt_offset); |
1254 | ||
1255 | // Every PLT entry needs a reloc. | |
67181c72 | 1256 | this->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 | 1257 | |
2e30d253 ILT |
1258 | // Note that we don't need to save the symbol. The contents of the |
1259 | // PLT are independent of which symbols are used. The symbols only | |
1260 | // appear in the relocations. | |
1261 | } | |
1262 | ||
7223e9ca ILT |
1263 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1264 | // the PLT offset. | |
1265 | ||
fc51264f | 1266 | template<int size> |
7223e9ca | 1267 | unsigned int |
fc51264f | 1268 | Output_data_plt_x86_64<size>::add_local_ifunc_entry( |
67181c72 ILT |
1269 | Symbol_table* symtab, |
1270 | Layout* layout, | |
fc51264f | 1271 | Sized_relobj_file<size, false>* relobj, |
6fa2a40b | 1272 | unsigned int local_sym_index) |
7223e9ca | 1273 | { |
2e702c99 | 1274 | unsigned int plt_offset = this->irelative_count_ * this->get_plt_entry_size(); |
67181c72 | 1275 | ++this->irelative_count_; |
7223e9ca | 1276 | |
67181c72 | 1277 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1278 | |
1279 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1280 | // entry. | |
67181c72 | 1281 | this->got_irelative_->set_current_data_size(got_offset + 8); |
7223e9ca ILT |
1282 | |
1283 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1284 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
1285 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
1286 | elfcpp::R_X86_64_IRELATIVE, | |
1287 | this->got_irelative_, got_offset, 0); | |
7223e9ca ILT |
1288 | |
1289 | return plt_offset; | |
1290 | } | |
1291 | ||
4829d394 CC |
1292 | // Add the relocation for a PLT entry. |
1293 | ||
fc51264f | 1294 | template<int size> |
4829d394 | 1295 | void |
fc51264f L |
1296 | Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab, |
1297 | Layout* layout, | |
1298 | Symbol* gsym, | |
1299 | unsigned int got_offset) | |
4829d394 CC |
1300 | { |
1301 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1302 | && gsym->can_use_relative_reloc(false)) | |
67181c72 ILT |
1303 | { |
1304 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
1305 | rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
1306 | this->got_irelative_, got_offset, 0); | |
1307 | } | |
4829d394 CC |
1308 | else |
1309 | { | |
1310 | gsym->set_needs_dynsym_entry(); | |
1311 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
1312 | got_offset, 0); | |
1313 | } | |
1314 | } | |
1315 | ||
e291e7b9 ILT |
1316 | // Return where the TLSDESC relocations should go, creating it if |
1317 | // necessary. These follow the JUMP_SLOT relocations. | |
1318 | ||
fc51264f L |
1319 | template<int size> |
1320 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1321 | Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout) | |
e291e7b9 ILT |
1322 | { |
1323 | if (this->tlsdesc_rel_ == NULL) | |
1324 | { | |
1325 | this->tlsdesc_rel_ = new Reloc_section(false); | |
1326 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1327 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 1328 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1329 | gold_assert(this->tlsdesc_rel_->output_section() |
1330 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1331 | } |
1332 | return this->tlsdesc_rel_; | |
1333 | } | |
1334 | ||
67181c72 ILT |
1335 | // Return where the IRELATIVE relocations should go in the PLT. These |
1336 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
1337 | ||
fc51264f L |
1338 | template<int size> |
1339 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1340 | Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab, | |
1341 | Layout* layout) | |
67181c72 ILT |
1342 | { |
1343 | if (this->irelative_rel_ == NULL) | |
1344 | { | |
1345 | // Make sure we have a place for the TLSDESC relocations, in | |
1346 | // case we see any later on. | |
1347 | this->rela_tlsdesc(layout); | |
1348 | this->irelative_rel_ = new Reloc_section(false); | |
1349 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1350 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1351 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1352 | gold_assert(this->irelative_rel_->output_section() | |
1353 | == this->rel_->output_section()); | |
1354 | ||
1355 | if (parameters->doing_static_link()) | |
1356 | { | |
1357 | // A statically linked executable will only have a .rela.plt | |
1358 | // section to hold R_X86_64_IRELATIVE relocs for | |
1359 | // STT_GNU_IFUNC symbols. The library will use these | |
1360 | // symbols to locate the IRELATIVE relocs at program startup | |
1361 | // time. | |
1362 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
1363 | Symbol_table::PREDEFINED, | |
1364 | this->irelative_rel_, 0, 0, | |
1365 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1366 | elfcpp::STV_HIDDEN, 0, false, true); | |
1367 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
1368 | Symbol_table::PREDEFINED, | |
1369 | this->irelative_rel_, 0, 0, | |
1370 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1371 | elfcpp::STV_HIDDEN, 0, true, true); | |
1372 | } | |
1373 | } | |
1374 | return this->irelative_rel_; | |
1375 | } | |
1376 | ||
1377 | // Return the PLT address to use for a global symbol. | |
1378 | ||
fc51264f | 1379 | template<int size> |
67181c72 | 1380 | uint64_t |
fc51264f | 1381 | Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym) |
67181c72 ILT |
1382 | { |
1383 | uint64_t offset = 0; | |
1384 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1385 | && gsym->can_use_relative_reloc(false)) | |
2e702c99 | 1386 | offset = (this->count_ + 1) * this->get_plt_entry_size(); |
19fec8c1 | 1387 | return this->address() + offset + gsym->plt_offset(); |
67181c72 ILT |
1388 | } |
1389 | ||
1390 | // Return the PLT address to use for a local symbol. These are always | |
1391 | // IRELATIVE relocs. | |
1392 | ||
fc51264f | 1393 | template<int size> |
67181c72 | 1394 | uint64_t |
19fec8c1 AM |
1395 | Output_data_plt_x86_64<size>::address_for_local(const Relobj* object, |
1396 | unsigned int r_sym) | |
67181c72 | 1397 | { |
19fec8c1 AM |
1398 | return (this->address() |
1399 | + (this->count_ + 1) * this->get_plt_entry_size() | |
1400 | + object->local_plt_offset(r_sym)); | |
67181c72 ILT |
1401 | } |
1402 | ||
c2b45e22 | 1403 | // Set the final size. |
fc51264f | 1404 | template<int size> |
c2b45e22 | 1405 | void |
fc51264f | 1406 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1407 | { |
67181c72 | 1408 | unsigned int count = this->count_ + this->irelative_count_; |
c2b45e22 CC |
1409 | if (this->has_tlsdesc_entry()) |
1410 | ++count; | |
2e702c99 | 1411 | this->set_data_size((count + 1) * this->get_plt_entry_size()); |
c2b45e22 CC |
1412 | } |
1413 | ||
2e30d253 ILT |
1414 | // The first entry in the PLT for an executable. |
1415 | ||
fc51264f L |
1416 | template<int size> |
1417 | const unsigned char | |
2e702c99 | 1418 | Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] = |
2e30d253 ILT |
1419 | { |
1420 | // From AMD64 ABI Draft 0.98, page 76 | |
1421 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1422 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1423 | 0xff, 0x25, // jmp indirect |
1424 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1425 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1426 | }; | |
1427 | ||
2e702c99 RM |
1428 | template<int size> |
1429 | void | |
1430 | Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry( | |
1431 | unsigned char* pov, | |
1432 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1433 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
1434 | { | |
1435 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1436 | // We do a jmp relative to the PC at the end of this instruction. | |
1437 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1438 | (got_address + 8 | |
1439 | - (plt_address + 6))); | |
1440 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1441 | (got_address + 16 | |
1442 | - (plt_address + 12))); | |
1443 | } | |
1444 | ||
2e30d253 ILT |
1445 | // Subsequent entries in the PLT for an executable. |
1446 | ||
fc51264f L |
1447 | template<int size> |
1448 | const unsigned char | |
2e702c99 | 1449 | Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] = |
2e30d253 ILT |
1450 | { |
1451 | // From AMD64 ABI Draft 0.98, page 76 | |
1452 | 0xff, 0x25, // jmpq indirect | |
1453 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1454 | 0x68, // pushq immediate | |
1455 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1456 | 0xe9, // jmpq relative | |
1457 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1458 | }; | |
1459 | ||
2e702c99 RM |
1460 | template<int size> |
1461 | unsigned int | |
1462 | Output_data_plt_x86_64_standard<size>::do_fill_plt_entry( | |
1463 | unsigned char* pov, | |
1464 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1465 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1466 | unsigned int got_offset, | |
1467 | unsigned int plt_offset, | |
1468 | unsigned int plt_index) | |
1469 | { | |
1470 | memcpy(pov, plt_entry, plt_entry_size); | |
1471 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1472 | (got_address + got_offset | |
1473 | - (plt_address + plt_offset | |
1474 | + 6))); | |
1475 | ||
1476 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1477 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1478 | - (plt_offset + plt_entry_size)); | |
1479 | ||
1480 | return 6; | |
1481 | } | |
1482 | ||
c2b45e22 CC |
1483 | // The reserved TLSDESC entry in the PLT for an executable. |
1484 | ||
fc51264f L |
1485 | template<int size> |
1486 | const unsigned char | |
2e702c99 | 1487 | Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] = |
c2b45e22 CC |
1488 | { |
1489 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1490 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1491 | 0xff, 0x35, // pushq x(%rip) | |
1492 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1493 | 0xff, 0x25, // jmpq *y(%rip) | |
1494 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1495 | 0x0f, 0x1f, // nop | |
1496 | 0x40, 0 | |
1497 | }; | |
1498 | ||
2e702c99 RM |
1499 | template<int size> |
1500 | void | |
1501 | Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry( | |
1502 | unsigned char* pov, | |
1503 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1504 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1505 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
1506 | unsigned int tlsdesc_got_offset, | |
1507 | unsigned int plt_offset) | |
1508 | { | |
1509 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1510 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1511 | (got_address + 8 | |
1512 | - (plt_address + plt_offset | |
1513 | + 6))); | |
1514 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1515 | (got_base | |
1516 | + tlsdesc_got_offset | |
1517 | - (plt_address + plt_offset | |
1518 | + 12))); | |
1519 | } | |
1520 | ||
07a60597 ILT |
1521 | // The .eh_frame unwind information for the PLT. |
1522 | ||
fc51264f | 1523 | template<int size> |
2e702c99 | 1524 | const unsigned char |
fc51264f | 1525 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
1526 | { |
1527 | 1, // CIE version. | |
1528 | 'z', // Augmentation: augmentation size included. | |
1529 | 'R', // Augmentation: FDE encoding included. | |
1530 | '\0', // End of augmentation string. | |
1531 | 1, // Code alignment factor. | |
1532 | 0x78, // Data alignment factor. | |
1533 | 16, // Return address column. | |
1534 | 1, // Augmentation size. | |
1535 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1536 | | elfcpp::DW_EH_PE_sdata4), | |
1537 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
1538 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
1539 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1540 | elfcpp::DW_CFA_nop | |
1541 | }; | |
1542 | ||
fc51264f | 1543 | template<int size> |
07a60597 | 1544 | const unsigned char |
2e702c99 | 1545 | Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1546 | { |
1547 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1548 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1549 | 0, // Augmentation size. | |
1550 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
1551 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1552 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
1553 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1554 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1555 | 11, // Block length. | |
1556 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
1557 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
1558 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1559 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
1560 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1561 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
1562 | elfcpp::DW_OP_lit3, // Push 3. | |
1563 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
1564 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
1565 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
1566 | elfcpp::DW_CFA_nop, | |
1567 | elfcpp::DW_CFA_nop, | |
1568 | elfcpp::DW_CFA_nop | |
1569 | }; | |
1570 | ||
2e30d253 ILT |
1571 | // Write out the PLT. This uses the hand-coded instructions above, |
1572 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
1573 | ||
fc51264f | 1574 | template<int size> |
2e30d253 | 1575 | void |
fc51264f | 1576 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 1577 | { |
2ea97941 | 1578 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1579 | const section_size_type oview_size = |
1580 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1581 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
1582 | |
1583 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1584 | gold_assert(parameters->incremental_update() |
1585 | || (got_file_offset + this->got_plt_->data_size() | |
1586 | == this->got_irelative_->offset())); | |
fe8718a4 | 1587 | const section_size_type got_size = |
67181c72 ILT |
1588 | convert_to_section_size_type(this->got_plt_->data_size() |
1589 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
1590 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1591 | got_size); | |
1592 | ||
1593 | unsigned char* pov = oview; | |
1594 | ||
c2b45e22 | 1595 | // The base address of the .plt section. |
fc51264f | 1596 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 1597 | // The base address of the .got section. |
fc51264f | 1598 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
1599 | // The base address of the PLT portion of the .got section, |
1600 | // which is where the GOT pointer will point, and where the | |
1601 | // three reserved GOT entries are located. | |
fc51264f L |
1602 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
1603 | = this->got_plt_->address(); | |
2e30d253 | 1604 | |
2e702c99 RM |
1605 | this->fill_first_plt_entry(pov, got_address, plt_address); |
1606 | pov += this->get_plt_entry_size(); | |
2e30d253 ILT |
1607 | |
1608 | unsigned char* got_pov = got_view; | |
1609 | ||
7d172687 ILT |
1610 | // The first entry in the GOT is the address of the .dynamic section |
1611 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1612 | // We saved space for them when we created the section in | |
1613 | // Target_x86_64::got_section. | |
1614 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1615 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1616 | elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr); | |
1617 | got_pov += 8; | |
1618 | memset(got_pov, 0, 16); | |
1619 | got_pov += 16; | |
2e30d253 | 1620 | |
2e702c99 | 1621 | unsigned int plt_offset = this->get_plt_entry_size(); |
2e30d253 | 1622 | unsigned int got_offset = 24; |
67181c72 | 1623 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
1624 | for (unsigned int plt_index = 0; |
1625 | plt_index < count; | |
1626 | ++plt_index, | |
2e702c99 | 1627 | pov += this->get_plt_entry_size(), |
2e30d253 | 1628 | got_pov += 8, |
2e702c99 | 1629 | plt_offset += this->get_plt_entry_size(), |
2e30d253 ILT |
1630 | got_offset += 8) |
1631 | { | |
1632 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1633 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1634 | got_address, plt_address, | |
1635 | got_offset, plt_offset, | |
1636 | plt_index); | |
2e30d253 ILT |
1637 | |
1638 | // Set the entry in the GOT. | |
2e702c99 RM |
1639 | elfcpp::Swap<64, false>::writeval(got_pov, |
1640 | plt_address + plt_offset + lazy_offset); | |
2e30d253 ILT |
1641 | } |
1642 | ||
c2b45e22 CC |
1643 | if (this->has_tlsdesc_entry()) |
1644 | { | |
1645 | // Set and adjust the reserved TLSDESC PLT entry. | |
1646 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2e702c99 RM |
1647 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, |
1648 | tlsdesc_got_offset, plt_offset); | |
1649 | pov += this->get_plt_entry_size(); | |
c2b45e22 CC |
1650 | } |
1651 | ||
fe8718a4 ILT |
1652 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1653 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1654 | |
2ea97941 | 1655 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1656 | of->write_output_view(got_file_offset, got_size, got_view); |
1657 | } | |
1658 | ||
c2b45e22 | 1659 | // Create the PLT section. |
2e30d253 | 1660 | |
fc51264f | 1661 | template<int size> |
2e30d253 | 1662 | void |
fc51264f | 1663 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1664 | { |
2e30d253 ILT |
1665 | if (this->plt_ == NULL) |
1666 | { | |
1667 | // Create the GOT sections first. | |
1668 | this->got_section(symtab, layout); | |
1669 | ||
2e702c99 RM |
1670 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
1671 | this->got_irelative_); | |
1672 | ||
1673 | // Add unwind information if requested. | |
1674 | if (parameters->options().ld_generated_unwind_info()) | |
1675 | this->plt_->add_eh_frame(layout); | |
1676 | ||
2e30d253 ILT |
1677 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1678 | (elfcpp::SHF_ALLOC | |
1679 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1680 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1681 | |
1682 | // Make the sh_info field of .rela.plt point to .plt. | |
1683 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1684 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1685 | } |
c2b45e22 CC |
1686 | } |
1687 | ||
e291e7b9 ILT |
1688 | // Return the section for TLSDESC relocations. |
1689 | ||
fc51264f L |
1690 | template<int size> |
1691 | typename Target_x86_64<size>::Reloc_section* | |
1692 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
1693 | { |
1694 | return this->plt_section()->rela_tlsdesc(layout); | |
1695 | } | |
1696 | ||
c2b45e22 CC |
1697 | // Create a PLT entry for a global symbol. |
1698 | ||
fc51264f | 1699 | template<int size> |
c2b45e22 | 1700 | void |
fc51264f L |
1701 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
1702 | Symbol* gsym) | |
c2b45e22 CC |
1703 | { |
1704 | if (gsym->has_plt_offset()) | |
1705 | return; | |
1706 | ||
1707 | if (this->plt_ == NULL) | |
1708 | this->make_plt_section(symtab, layout); | |
2e30d253 | 1709 | |
67181c72 | 1710 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
1711 | } |
1712 | ||
7223e9ca ILT |
1713 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1714 | ||
fc51264f | 1715 | template<int size> |
7223e9ca | 1716 | void |
fc51264f L |
1717 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
1718 | Symbol_table* symtab, Layout* layout, | |
1719 | Sized_relobj_file<size, false>* relobj, | |
1720 | unsigned int local_sym_index) | |
7223e9ca ILT |
1721 | { |
1722 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1723 | return; | |
1724 | if (this->plt_ == NULL) | |
1725 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1726 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1727 | relobj, | |
7223e9ca ILT |
1728 | local_sym_index); |
1729 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1730 | } | |
1731 | ||
0e70b911 CC |
1732 | // Return the number of entries in the PLT. |
1733 | ||
fc51264f | 1734 | template<int size> |
0e70b911 | 1735 | unsigned int |
fc51264f | 1736 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
1737 | { |
1738 | if (this->plt_ == NULL) | |
1739 | return 0; | |
1740 | return this->plt_->entry_count(); | |
1741 | } | |
1742 | ||
1743 | // Return the offset of the first non-reserved PLT entry. | |
1744 | ||
fc51264f | 1745 | template<int size> |
0e70b911 | 1746 | unsigned int |
fc51264f | 1747 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 1748 | { |
2e702c99 | 1749 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1750 | } |
1751 | ||
1752 | // Return the size of each PLT entry. | |
1753 | ||
fc51264f | 1754 | template<int size> |
0e70b911 | 1755 | unsigned int |
fc51264f | 1756 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 1757 | { |
2e702c99 | 1758 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1759 | } |
1760 | ||
4829d394 CC |
1761 | // Create the GOT and PLT sections for an incremental update. |
1762 | ||
fc51264f | 1763 | template<int size> |
dd74ae06 | 1764 | Output_data_got_base* |
fc51264f | 1765 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
1766 | Layout* layout, |
1767 | unsigned int got_count, | |
1768 | unsigned int plt_count) | |
1769 | { | |
1770 | gold_assert(this->got_ == NULL); | |
1771 | ||
1772 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
1773 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1774 | (elfcpp::SHF_ALLOC | |
1775 | | elfcpp::SHF_WRITE), | |
1776 | this->got_, ORDER_RELRO_LAST, | |
1777 | true); | |
1778 | ||
1779 | // Add the three reserved entries. | |
1780 | this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT"); | |
1781 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1782 | (elfcpp::SHF_ALLOC | |
1783 | | elfcpp::SHF_WRITE), | |
1784 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
1785 | false); | |
1786 | ||
1787 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1788 | this->global_offset_table_ = | |
1789 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1790 | Symbol_table::PREDEFINED, | |
1791 | this->got_plt_, | |
1792 | 0, 0, elfcpp::STT_OBJECT, | |
1793 | elfcpp::STB_LOCAL, | |
1794 | elfcpp::STV_HIDDEN, 0, | |
1795 | false, false); | |
1796 | ||
1797 | // If there are any TLSDESC relocations, they get GOT entries in | |
1798 | // .got.plt after the jump slot entries. | |
1799 | // FIXME: Get the count for TLSDESC entries. | |
1800 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
1801 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1802 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1803 | this->got_tlsdesc_, | |
1804 | ORDER_NON_RELRO_FIRST, false); | |
1805 | ||
67181c72 ILT |
1806 | // If there are any IRELATIVE relocations, they get GOT entries in |
1807 | // .got.plt after the jump slot and TLSDESC entries. | |
1808 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
1809 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1810 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1811 | this->got_irelative_, | |
1812 | ORDER_NON_RELRO_FIRST, false); | |
1813 | ||
4829d394 | 1814 | // Create the PLT section. |
2e702c99 RM |
1815 | this->plt_ = this->make_data_plt(layout, this->got_, |
1816 | this->got_plt_, | |
1817 | this->got_irelative_, | |
1818 | plt_count); | |
1819 | ||
1820 | // Add unwind information if requested. | |
1821 | if (parameters->options().ld_generated_unwind_info()) | |
1822 | this->plt_->add_eh_frame(layout); | |
1823 | ||
4829d394 CC |
1824 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1825 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
1826 | this->plt_, ORDER_PLT, false); | |
1827 | ||
1828 | // Make the sh_info field of .rela.plt point to .plt. | |
1829 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1830 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
1831 | ||
6fa2a40b CC |
1832 | // Create the rela_dyn section. |
1833 | this->rela_dyn_section(layout); | |
1834 | ||
4829d394 CC |
1835 | return this->got_; |
1836 | } | |
1837 | ||
6fa2a40b CC |
1838 | // Reserve a GOT entry for a local symbol, and regenerate any |
1839 | // necessary dynamic relocations. | |
1840 | ||
fc51264f | 1841 | template<int size> |
6fa2a40b | 1842 | void |
fc51264f | 1843 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 1844 | unsigned int got_index, |
fc51264f | 1845 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
1846 | unsigned int r_sym, |
1847 | unsigned int got_type) | |
1848 | { | |
1849 | unsigned int got_offset = got_index * 8; | |
1850 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1851 | ||
1852 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
1853 | switch (got_type) | |
1854 | { | |
1855 | case GOT_TYPE_STANDARD: | |
1856 | if (parameters->options().output_is_position_independent()) | |
1857 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 1858 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1859 | break; |
1860 | case GOT_TYPE_TLS_OFFSET: | |
1861 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
1862 | this->got_, got_offset, 0); | |
1863 | break; | |
1864 | case GOT_TYPE_TLS_PAIR: | |
1865 | this->got_->reserve_slot(got_index + 1); | |
1866 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
1867 | this->got_, got_offset, 0); | |
1868 | break; | |
1869 | case GOT_TYPE_TLS_DESC: | |
1870 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
1871 | // this->got_->reserve_slot(got_index + 1); | |
1872 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1873 | // this->got_, got_offset, 0); | |
1874 | break; | |
1875 | default: | |
1876 | gold_unreachable(); | |
1877 | } | |
1878 | } | |
1879 | ||
1880 | // Reserve a GOT entry for a global symbol, and regenerate any | |
1881 | // necessary dynamic relocations. | |
1882 | ||
fc51264f | 1883 | template<int size> |
6fa2a40b | 1884 | void |
fc51264f L |
1885 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
1886 | Symbol* gsym, | |
1887 | unsigned int got_type) | |
6fa2a40b CC |
1888 | { |
1889 | unsigned int got_offset = got_index * 8; | |
1890 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1891 | ||
1892 | this->got_->reserve_global(got_index, gsym, got_type); | |
1893 | switch (got_type) | |
1894 | { | |
1895 | case GOT_TYPE_STANDARD: | |
1896 | if (!gsym->final_value_is_known()) | |
1897 | { | |
1898 | if (gsym->is_from_dynobj() | |
1899 | || gsym->is_undefined() | |
1900 | || gsym->is_preemptible() | |
1901 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1902 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
1903 | this->got_, got_offset, 0); | |
1904 | else | |
1905 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 1906 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1907 | } |
1908 | break; | |
1909 | case GOT_TYPE_TLS_OFFSET: | |
1910 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
13cf9988 | 1911 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1912 | break; |
1913 | case GOT_TYPE_TLS_PAIR: | |
1914 | this->got_->reserve_slot(got_index + 1); | |
1915 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
13cf9988 | 1916 | this->got_, got_offset, 0, false); |
6fa2a40b | 1917 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, |
13cf9988 | 1918 | this->got_, got_offset + 8, 0, false); |
6fa2a40b CC |
1919 | break; |
1920 | case GOT_TYPE_TLS_DESC: | |
1921 | this->got_->reserve_slot(got_index + 1); | |
1922 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
13cf9988 | 1923 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1924 | break; |
1925 | default: | |
1926 | gold_unreachable(); | |
1927 | } | |
1928 | } | |
1929 | ||
4829d394 CC |
1930 | // Register an existing PLT entry for a global symbol. |
1931 | ||
fc51264f | 1932 | template<int size> |
4829d394 | 1933 | void |
fc51264f L |
1934 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
1935 | Layout* layout, | |
1936 | unsigned int plt_index, | |
1937 | Symbol* gsym) | |
4829d394 CC |
1938 | { |
1939 | gold_assert(this->plt_ != NULL); | |
1940 | gold_assert(!gsym->has_plt_offset()); | |
1941 | ||
1942 | this->plt_->reserve_slot(plt_index); | |
1943 | ||
1944 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
1945 | ||
1946 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 1947 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
1948 | } |
1949 | ||
26d3c67d CC |
1950 | // Force a COPY relocation for a given symbol. |
1951 | ||
fc51264f | 1952 | template<int size> |
26d3c67d | 1953 | void |
fc51264f | 1954 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
1955 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
1956 | { | |
1957 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 1958 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
1959 | os, |
1960 | offset, | |
1961 | this->rela_dyn_section(NULL)); | |
1962 | } | |
1963 | ||
9fa33bee | 1964 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 1965 | |
fc51264f | 1966 | template<int size> |
edfbb029 | 1967 | void |
fc51264f L |
1968 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
1969 | Layout* layout) | |
edfbb029 CC |
1970 | { |
1971 | if (this->tls_base_symbol_defined_) | |
1972 | return; | |
1973 | ||
1974 | Output_segment* tls_segment = layout->tls_segment(); | |
1975 | if (tls_segment != NULL) | |
1976 | { | |
183fd0e3 | 1977 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1978 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1979 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1980 | tls_segment, 0, 0, |
1981 | elfcpp::STT_TLS, | |
1982 | elfcpp::STB_LOCAL, | |
1983 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1984 | (is_exec |
1985 | ? Symbol::SEGMENT_END | |
1986 | : Symbol::SEGMENT_START), | |
1987 | true); | |
edfbb029 CC |
1988 | } |
1989 | this->tls_base_symbol_defined_ = true; | |
1990 | } | |
1991 | ||
c2b45e22 CC |
1992 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1993 | ||
fc51264f | 1994 | template<int size> |
c2b45e22 | 1995 | void |
fc51264f | 1996 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
2e702c99 | 1997 | Layout* layout) |
c2b45e22 CC |
1998 | { |
1999 | if (this->plt_ == NULL) | |
2000 | this->make_plt_section(symtab, layout); | |
2001 | ||
2002 | if (!this->plt_->has_tlsdesc_entry()) | |
2003 | { | |
2004 | // Allocate the TLSDESC_GOT entry. | |
2005 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2006 | unsigned int got_offset = got->add_constant(0); | |
2007 | ||
2008 | // Allocate the TLSDESC_PLT entry. | |
2009 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
2010 | } | |
2011 | } | |
2012 | ||
31d60480 ILT |
2013 | // Create a GOT entry for the TLS module index. |
2014 | ||
fc51264f | 2015 | template<int size> |
31d60480 | 2016 | unsigned int |
fc51264f L |
2017 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
2018 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
2019 | { |
2020 | if (this->got_mod_index_offset_ == -1U) | |
2021 | { | |
2022 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
2023 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
2024 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2025 | unsigned int got_offset = got->add_constant(0); | |
2026 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
2e702c99 | 2027 | got_offset, 0); |
009a67a2 | 2028 | got->add_constant(0); |
31d60480 ILT |
2029 | this->got_mod_index_offset_ = got_offset; |
2030 | } | |
2031 | return this->got_mod_index_offset_; | |
2032 | } | |
2033 | ||
2e30d253 ILT |
2034 | // Optimize the TLS relocation type based on what we know about the |
2035 | // symbol. IS_FINAL is true if the final address of this symbol is | |
2036 | // known at link time. | |
2037 | ||
fc51264f | 2038 | template<int size> |
e041f13d | 2039 | tls::Tls_optimization |
fc51264f | 2040 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 2041 | { |
2e30d253 ILT |
2042 | // If we are generating a shared library, then we can't do anything |
2043 | // in the linker. | |
8851ecca | 2044 | if (parameters->options().shared()) |
e041f13d | 2045 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2046 | |
2047 | switch (r_type) | |
2048 | { | |
2049 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
2050 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2051 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2052 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
2053 | // access. Since we know that we are generating an executable, |
2054 | // we can convert this to Initial-Exec. If we also know that | |
2055 | // this is a local symbol, we can further switch to Local-Exec. | |
2056 | if (is_final) | |
e041f13d ILT |
2057 | return tls::TLSOPT_TO_LE; |
2058 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 2059 | |
d61c17ea | 2060 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
2061 | // This is Local-Dynamic, which refers to a local symbol in the |
2062 | // dynamic TLS block. Since we know that we generating an | |
2063 | // executable, we can switch to Local-Exec. | |
e041f13d | 2064 | return tls::TLSOPT_TO_LE; |
2e30d253 | 2065 | |
0ffd9845 | 2066 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
2067 | case elfcpp::R_X86_64_DTPOFF64: |
2068 | // Another Local-Dynamic reloc. | |
e041f13d | 2069 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 2070 | |
d61c17ea | 2071 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
2072 | // These are Initial-Exec relocs which get the thread offset |
2073 | // from the GOT. If we know that we are linking against the | |
2074 | // local symbol, we can switch to Local-Exec, which links the | |
2075 | // thread offset into the instruction. | |
2076 | if (is_final) | |
e041f13d ILT |
2077 | return tls::TLSOPT_TO_LE; |
2078 | return tls::TLSOPT_NONE; | |
2e30d253 | 2079 | |
d61c17ea | 2080 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
2081 | // When we already have Local-Exec, there is nothing further we |
2082 | // can do. | |
e041f13d | 2083 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2084 | |
2085 | default: | |
2086 | gold_unreachable(); | |
2087 | } | |
2e30d253 ILT |
2088 | } |
2089 | ||
95a2c8d6 RS |
2090 | // Get the Reference_flags for a particular relocation. |
2091 | ||
fc51264f | 2092 | template<int size> |
95a2c8d6 | 2093 | int |
fc51264f | 2094 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
2095 | { |
2096 | switch (r_type) | |
2097 | { | |
2098 | case elfcpp::R_X86_64_NONE: | |
2099 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
2100 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2101 | case elfcpp::R_X86_64_GOTPC32: | |
2102 | case elfcpp::R_X86_64_GOTPC64: | |
2103 | // No symbol reference. | |
2104 | return 0; | |
2105 | ||
2106 | case elfcpp::R_X86_64_64: | |
2107 | case elfcpp::R_X86_64_32: | |
2108 | case elfcpp::R_X86_64_32S: | |
2109 | case elfcpp::R_X86_64_16: | |
2110 | case elfcpp::R_X86_64_8: | |
2111 | return Symbol::ABSOLUTE_REF; | |
2112 | ||
2113 | case elfcpp::R_X86_64_PC64: | |
2114 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2115 | case elfcpp::R_X86_64_PC32_BND: |
95a2c8d6 RS |
2116 | case elfcpp::R_X86_64_PC16: |
2117 | case elfcpp::R_X86_64_PC8: | |
2118 | case elfcpp::R_X86_64_GOTOFF64: | |
2119 | return Symbol::RELATIVE_REF; | |
2120 | ||
2121 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 2122 | case elfcpp::R_X86_64_PLT32_BND: |
95a2c8d6 RS |
2123 | case elfcpp::R_X86_64_PLTOFF64: |
2124 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
2125 | ||
2126 | case elfcpp::R_X86_64_GOT64: | |
2127 | case elfcpp::R_X86_64_GOT32: | |
2128 | case elfcpp::R_X86_64_GOTPCREL64: | |
2129 | case elfcpp::R_X86_64_GOTPCREL: | |
2130 | case elfcpp::R_X86_64_GOTPLT64: | |
2131 | // Absolute in GOT. | |
2132 | return Symbol::ABSOLUTE_REF; | |
2133 | ||
2134 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2135 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2136 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2137 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2138 | case elfcpp::R_X86_64_DTPOFF32: | |
2139 | case elfcpp::R_X86_64_DTPOFF64: | |
2140 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2141 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2142 | return Symbol::TLS_REF; | |
2143 | ||
2144 | case elfcpp::R_X86_64_COPY: | |
2145 | case elfcpp::R_X86_64_GLOB_DAT: | |
2146 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2147 | case elfcpp::R_X86_64_RELATIVE: | |
2148 | case elfcpp::R_X86_64_IRELATIVE: | |
2149 | case elfcpp::R_X86_64_TPOFF64: | |
2150 | case elfcpp::R_X86_64_DTPMOD64: | |
2151 | case elfcpp::R_X86_64_TLSDESC: | |
2152 | case elfcpp::R_X86_64_SIZE32: | |
2153 | case elfcpp::R_X86_64_SIZE64: | |
2154 | default: | |
2155 | // Not expected. We will give an error later. | |
2156 | return 0; | |
2157 | } | |
2158 | } | |
2159 | ||
e041f13d ILT |
2160 | // Report an unsupported relocation against a local symbol. |
2161 | ||
fc51264f | 2162 | template<int size> |
e041f13d | 2163 | void |
fc51264f L |
2164 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
2165 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2166 | unsigned int r_type) |
e041f13d | 2167 | { |
75f2446e ILT |
2168 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2169 | object->name().c_str(), r_type); | |
e041f13d ILT |
2170 | } |
2171 | ||
a036edd8 ILT |
2172 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
2173 | // dynamic linker does not support it, issue an error. The GNU linker | |
2174 | // only issues a non-PIC error for an allocated read-only section. | |
2175 | // Here we know the section is allocated, but we don't know that it is | |
2176 | // read-only. But we check for all the relocation types which the | |
2177 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
2178 | // error even if the section is not read-only. If GSYM is not NULL, |
2179 | // it is the symbol the relocation is against; if it is NULL, the | |
2180 | // relocation is against a local symbol. | |
a036edd8 | 2181 | |
fc51264f | 2182 | template<int size> |
a036edd8 | 2183 | void |
fc51264f L |
2184 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
2185 | Symbol* gsym) | |
a036edd8 ILT |
2186 | { |
2187 | switch (r_type) | |
2188 | { | |
2fbb4320 ILT |
2189 | // These are the relocation types supported by glibc for x86_64 |
2190 | // which should always work. | |
a036edd8 | 2191 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 2192 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
2193 | case elfcpp::R_X86_64_GLOB_DAT: |
2194 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2195 | case elfcpp::R_X86_64_DTPMOD64: | |
2196 | case elfcpp::R_X86_64_DTPOFF64: | |
2197 | case elfcpp::R_X86_64_TPOFF64: | |
2198 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
2199 | case elfcpp::R_X86_64_COPY: |
2200 | return; | |
2201 | ||
2202 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 2203 | case elfcpp::R_X86_64_PC32: |
f49fe902 | 2204 | case elfcpp::R_X86_64_PC32_BND: |
a29b0dad ILT |
2205 | // A PC relative reference is OK against a local symbol or if |
2206 | // the symbol is defined locally. | |
2207 | if (gsym == NULL | |
2208 | || (!gsym->is_from_dynobj() | |
2209 | && !gsym->is_undefined() | |
2210 | && !gsym->is_preemptible())) | |
2211 | return; | |
2212 | /* Fall through. */ | |
2213 | case elfcpp::R_X86_64_32: | |
3660ff06 L |
2214 | // R_X86_64_32 is OK for x32. |
2215 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2216 | return; | |
2fbb4320 ILT |
2217 | if (this->issued_non_pic_error_) |
2218 | return; | |
2219 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
2220 | if (gsym == NULL) |
2221 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
2222 | "overflow at runtime; recompile with -fPIC")); | |
2223 | else | |
f49fe902 L |
2224 | { |
2225 | const char *r_name; | |
2226 | switch (r_type) | |
2227 | { | |
2228 | case elfcpp::R_X86_64_32: | |
2229 | r_name = "R_X86_64_32"; | |
2230 | break; | |
2231 | case elfcpp::R_X86_64_PC32: | |
2232 | r_name = "R_X86_64_PC32"; | |
2233 | break; | |
2234 | case elfcpp::R_X86_64_PC32_BND: | |
2235 | r_name = "R_X86_64_PC32_BND"; | |
2236 | break; | |
2237 | default: | |
2238 | gold_unreachable(); | |
2239 | break; | |
2240 | } | |
2241 | object->error(_("requires dynamic %s reloc against '%s' " | |
2242 | "which may overflow at runtime; recompile " | |
2243 | "with -fPIC"), | |
2244 | r_name, gsym->name()); | |
2245 | } | |
2fbb4320 | 2246 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
2247 | return; |
2248 | ||
2249 | default: | |
2250 | // This prevents us from issuing more than one error per reloc | |
2251 | // section. But we can still wind up issuing more than one | |
2252 | // error per object file. | |
2253 | if (this->issued_non_pic_error_) | |
2e702c99 | 2254 | return; |
33aea2fd | 2255 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad | 2256 | object->error(_("requires unsupported dynamic reloc %u; " |
2e702c99 | 2257 | "recompile with -fPIC"), |
a29b0dad | 2258 | r_type); |
a036edd8 ILT |
2259 | this->issued_non_pic_error_ = true; |
2260 | return; | |
2261 | ||
2262 | case elfcpp::R_X86_64_NONE: | |
2263 | gold_unreachable(); | |
2264 | } | |
2265 | } | |
2266 | ||
7223e9ca ILT |
2267 | // Return whether we need to make a PLT entry for a relocation of the |
2268 | // given type against a STT_GNU_IFUNC symbol. | |
2269 | ||
fc51264f | 2270 | template<int size> |
7223e9ca | 2271 | bool |
fc51264f L |
2272 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
2273 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2274 | unsigned int r_type) |
7223e9ca | 2275 | { |
95a2c8d6 RS |
2276 | int flags = Scan::get_reference_flags(r_type); |
2277 | if (flags & Symbol::TLS_REF) | |
2278 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 2279 | object->name().c_str(), r_type); |
95a2c8d6 | 2280 | return flags != 0; |
7223e9ca ILT |
2281 | } |
2282 | ||
2e30d253 ILT |
2283 | // Scan a relocation for a local symbol. |
2284 | ||
fc51264f | 2285 | template<int size> |
2e30d253 | 2286 | inline void |
fc51264f L |
2287 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
2288 | Layout* layout, | |
2289 | Target_x86_64<size>* target, | |
2290 | Sized_relobj_file<size, false>* object, | |
2291 | unsigned int data_shndx, | |
2292 | Output_section* output_section, | |
2293 | const elfcpp::Rela<size, false>& reloc, | |
2294 | unsigned int r_type, | |
bfdfa4cd AM |
2295 | const elfcpp::Sym<size, false>& lsym, |
2296 | bool is_discarded) | |
2e30d253 | 2297 | { |
bfdfa4cd AM |
2298 | if (is_discarded) |
2299 | return; | |
2300 | ||
7223e9ca | 2301 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
2302 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
2303 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 2304 | { |
fc51264f | 2305 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2306 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
2307 | } | |
2308 | ||
2e30d253 ILT |
2309 | switch (r_type) |
2310 | { | |
2311 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2312 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2313 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2314 | break; |
2315 | ||
2316 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 2317 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2318 | // executable), we need to create a dynamic relocation for this |
2319 | // location. The relocation applied at link time will apply the | |
2320 | // link-time value, so we flag the location with an | |
2321 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 2322 | // relocate it easily. |
8851ecca | 2323 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
2324 | { |
2325 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2326 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca | 2327 | rela_dyn->add_local_relative(object, r_sym, |
62fe925a | 2328 | (size == 32 |
fd885f3a L |
2329 | ? elfcpp::R_X86_64_RELATIVE64 |
2330 | : elfcpp::R_X86_64_RELATIVE), | |
7223e9ca ILT |
2331 | output_section, data_shndx, |
2332 | reloc.get_r_offset(), | |
397b129b | 2333 | reloc.get_r_addend(), is_ifunc); |
2e702c99 | 2334 | } |
d61c6bd4 ILT |
2335 | break; |
2336 | ||
2e30d253 ILT |
2337 | case elfcpp::R_X86_64_32: |
2338 | case elfcpp::R_X86_64_32S: | |
2339 | case elfcpp::R_X86_64_16: | |
2340 | case elfcpp::R_X86_64_8: | |
96f2030e | 2341 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2342 | // executable), we need to create a dynamic relocation for this |
2343 | // location. We can't use an R_X86_64_RELATIVE relocation | |
2344 | // because that is always a 64-bit relocation. | |
8851ecca | 2345 | if (parameters->options().output_is_position_independent()) |
2e702c99 | 2346 | { |
3660ff06 L |
2347 | // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32. |
2348 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2349 | { | |
2350 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2351 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2352 | rela_dyn->add_local_relative(object, r_sym, | |
2353 | elfcpp::R_X86_64_RELATIVE, | |
2354 | output_section, data_shndx, | |
2355 | reloc.get_r_offset(), | |
2356 | reloc.get_r_addend(), is_ifunc); | |
2357 | break; | |
2358 | } | |
2359 | ||
2e702c99 | 2360 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 2361 | |
2e702c99 | 2362 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 2363 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
2e702c99 | 2364 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
2365 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
2366 | data_shndx, reloc.get_r_offset(), | |
2367 | reloc.get_r_addend()); | |
2e702c99 RM |
2368 | else |
2369 | { | |
2370 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
2371 | unsigned int shndx = lsym.get_st_shndx(); |
2372 | bool is_ordinary; | |
2373 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
2374 | &is_ordinary); | |
2375 | if (!is_ordinary) | |
2376 | object->error(_("section symbol %u has bad shndx %u"), | |
2377 | r_sym, shndx); | |
2378 | else | |
2379 | rela_dyn->add_local_section(object, shndx, | |
2380 | r_type, output_section, | |
2381 | data_shndx, reloc.get_r_offset(), | |
2382 | reloc.get_r_addend()); | |
2e702c99 RM |
2383 | } |
2384 | } | |
2e30d253 ILT |
2385 | break; |
2386 | ||
2387 | case elfcpp::R_X86_64_PC64: | |
2388 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2389 | case elfcpp::R_X86_64_PC32_BND: |
2e30d253 ILT |
2390 | case elfcpp::R_X86_64_PC16: |
2391 | case elfcpp::R_X86_64_PC8: | |
2392 | break; | |
2393 | ||
f389a824 | 2394 | case elfcpp::R_X86_64_PLT32: |
f49fe902 | 2395 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 ILT |
2396 | // Since we know this is a local symbol, we can handle this as a |
2397 | // PC32 reloc. | |
2398 | break; | |
2399 | ||
fdc2f80f | 2400 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2401 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2402 | case elfcpp::R_X86_64_GOTPC64: |
2403 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2404 | // We need a GOT section. |
2405 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2406 | // For PLTOFF64, we'd normally want a PLT section, but since we |
2407 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
2408 | break; |
2409 | ||
0ffd9845 ILT |
2410 | case elfcpp::R_X86_64_GOT64: |
2411 | case elfcpp::R_X86_64_GOT32: | |
2412 | case elfcpp::R_X86_64_GOTPCREL64: | |
2413 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 2414 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 2415 | { |
2e702c99 RM |
2416 | // The symbol requires a GOT entry. |
2417 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
2418 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
7223e9ca ILT |
2419 | |
2420 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
2421 | // lets function pointers compare correctly with shared | |
2422 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
2423 | bool is_new; | |
397b129b | 2424 | if (is_ifunc) |
7223e9ca ILT |
2425 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
2426 | else | |
2427 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
2428 | if (is_new) |
2429 | { | |
2430 | // If we are generating a shared object, we need to add a | |
2431 | // dynamic relocation for this symbol's GOT entry. | |
2432 | if (parameters->options().output_is_position_independent()) | |
2433 | { | |
2434 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
2435 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
2436 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
2437 | { |
2438 | unsigned int got_offset = | |
2439 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
2440 | rela_dyn->add_local_relative(object, r_sym, | |
2441 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2442 | got, got_offset, 0, is_ifunc); |
7223e9ca | 2443 | } |
2e702c99 RM |
2444 | else |
2445 | { | |
2446 | this->check_non_pic(object, r_type, NULL); | |
2447 | ||
2448 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2449 | rela_dyn->add_local( | |
2450 | object, r_sym, r_type, got, | |
2451 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
2452 | } | |
2453 | } | |
2454 | } | |
2455 | // For GOTPLT64, we'd normally want a PLT section, but since | |
2456 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
2457 | } |
2458 | break; | |
2459 | ||
2e30d253 ILT |
2460 | case elfcpp::R_X86_64_COPY: |
2461 | case elfcpp::R_X86_64_GLOB_DAT: | |
2462 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2463 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2464 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2465 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2466 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2467 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2468 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2469 | gold_error(_("%s: unexpected reloc %u in object file"), |
2470 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2471 | break; |
2472 | ||
d61c17ea | 2473 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2474 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2475 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2476 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2477 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2478 | case elfcpp::R_X86_64_DTPOFF32: |
2479 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2480 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2481 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 2482 | { |
8851ecca | 2483 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 2484 | const tls::Tls_optimization optimized_type |
2e702c99 | 2485 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
fc51264f | 2486 | r_type); |
2e30d253 ILT |
2487 | switch (r_type) |
2488 | { | |
2e702c99 RM |
2489 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
2490 | if (optimized_type == tls::TLSOPT_NONE) | |
2491 | { | |
2492 | // Create a pair of GOT entries for the module index and | |
2493 | // dtv-relative offset. | |
2494 | Output_data_got<64, false>* got | |
2495 | = target->got_section(symtab, layout); | |
2496 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
d491d34e ILT |
2497 | unsigned int shndx = lsym.get_st_shndx(); |
2498 | bool is_ordinary; | |
2499 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
2500 | if (!is_ordinary) | |
2501 | object->error(_("local symbol %u has bad shndx %u"), | |
2502 | r_sym, shndx); | |
2e702c99 | 2503 | else |
83896202 ILT |
2504 | got->add_local_pair_with_rel(object, r_sym, |
2505 | shndx, | |
2506 | GOT_TYPE_TLS_PAIR, | |
2507 | target->rela_dyn_section(layout), | |
bd73a62d | 2508 | elfcpp::R_X86_64_DTPMOD64); |
2e702c99 RM |
2509 | } |
2510 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2511 | unsupported_reloc_local(object, r_type); |
2e702c99 | 2512 | break; |
7bf1f802 | 2513 | |
2e702c99 RM |
2514 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2515 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
2516 | if (optimized_type == tls::TLSOPT_NONE) |
2517 | { | |
2e702c99 RM |
2518 | // Create reserved PLT and GOT entries for the resolver. |
2519 | target->reserve_tlsdesc_entries(symtab, layout); | |
2520 | ||
2521 | // Generate a double GOT entry with an | |
2522 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
2523 | // is resolved lazily, so the GOT entry needs to be in | |
2524 | // an area in .got.plt, not .got. Call got_section to | |
2525 | // make sure the section has been created. | |
a8df5856 | 2526 | target->got_section(symtab, layout); |
2e702c99 RM |
2527 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
2528 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
e291e7b9 ILT |
2529 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
2530 | { | |
2531 | unsigned int got_offset = got->add_constant(0); | |
2532 | got->add_constant(0); | |
2533 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
2534 | got_offset); | |
2535 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
2536 | // We store the arguments we need in a vector, and | |
2537 | // use the index into the vector as the parameter | |
2538 | // to pass to the target specific routines. | |
2539 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
2540 | void* arg = reinterpret_cast<void*>(intarg); | |
2541 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2542 | got, got_offset, 0); | |
2543 | } | |
c2b45e22 CC |
2544 | } |
2545 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2546 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
2547 | break; |
2548 | ||
2e702c99 | 2549 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
2550 | break; |
2551 | ||
2e702c99 | 2552 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2553 | if (optimized_type == tls::TLSOPT_NONE) |
2554 | { | |
2e702c99 RM |
2555 | // Create a GOT entry for the module index. |
2556 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
2557 | } |
2558 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2559 | unsupported_reloc_local(object, r_type); | |
2560 | break; | |
2561 | ||
2e702c99 RM |
2562 | case elfcpp::R_X86_64_DTPOFF32: |
2563 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2564 | break; |
2565 | ||
2e702c99 | 2566 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2567 | layout->set_has_static_tls(); |
2e702c99 RM |
2568 | if (optimized_type == tls::TLSOPT_NONE) |
2569 | { | |
2570 | // Create a GOT entry for the tp-relative offset. | |
2571 | Output_data_got<64, false>* got | |
2572 | = target->got_section(symtab, layout); | |
2573 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2574 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2575 | target->rela_dyn_section(layout), |
2576 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
2577 | } |
2578 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2579 | unsupported_reloc_local(object, r_type); | |
2580 | break; | |
0ffd9845 | 2581 | |
2e702c99 | 2582 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2583 | layout->set_has_static_tls(); |
2e702c99 RM |
2584 | if (output_is_shared) |
2585 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 2586 | break; |
e041f13d | 2587 | |
2e702c99 RM |
2588 | default: |
2589 | gold_unreachable(); | |
2e30d253 ILT |
2590 | } |
2591 | } | |
2592 | break; | |
2e30d253 | 2593 | |
fdc2f80f ILT |
2594 | case elfcpp::R_X86_64_SIZE32: |
2595 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2596 | default: |
75f2446e ILT |
2597 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2598 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2599 | break; |
2600 | } | |
2601 | } | |
2602 | ||
2603 | ||
e041f13d ILT |
2604 | // Report an unsupported relocation against a global symbol. |
2605 | ||
fc51264f | 2606 | template<int size> |
e041f13d | 2607 | void |
fc51264f L |
2608 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
2609 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
2610 | unsigned int r_type, |
2611 | Symbol* gsym) | |
e041f13d | 2612 | { |
75f2446e | 2613 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2614 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
2615 | } |
2616 | ||
ce97fa81 | 2617 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 2618 | template<int size> |
21bb3914 | 2619 | inline bool |
fc51264f | 2620 | Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type) |
21bb3914 | 2621 | { |
21bb3914 ST |
2622 | switch (r_type) |
2623 | { | |
2624 | case elfcpp::R_X86_64_64: | |
2625 | case elfcpp::R_X86_64_32: | |
2626 | case elfcpp::R_X86_64_32S: | |
2627 | case elfcpp::R_X86_64_16: | |
2628 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
2629 | case elfcpp::R_X86_64_GOT64: |
2630 | case elfcpp::R_X86_64_GOT32: | |
2631 | case elfcpp::R_X86_64_GOTPCREL64: | |
2632 | case elfcpp::R_X86_64_GOTPCREL: | |
2633 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 | 2634 | { |
2e702c99 | 2635 | return true; |
21bb3914 ST |
2636 | } |
2637 | } | |
2638 | return false; | |
2639 | } | |
2640 | ||
2641 | // For safe ICF, scan a relocation for a local symbol to check if it | |
2642 | // corresponds to a function pointer being taken. In that case mark | |
2643 | // the function whose pointer was taken as not foldable. | |
2644 | ||
fc51264f | 2645 | template<int size> |
21bb3914 | 2646 | inline bool |
fc51264f | 2647 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
2648 | Symbol_table* , |
2649 | Layout* , | |
fc51264f L |
2650 | Target_x86_64<size>* , |
2651 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2652 | unsigned int , |
2653 | Output_section* , | |
fc51264f | 2654 | const elfcpp::Rela<size, false>& , |
21bb3914 | 2655 | unsigned int r_type, |
fc51264f | 2656 | const elfcpp::Sym<size, false>&) |
21bb3914 ST |
2657 | { |
2658 | // When building a shared library, do not fold any local symbols as it is | |
2659 | // not possible to distinguish pointer taken versus a call by looking at | |
2660 | // the relocation types. | |
2661 | return (parameters->options().shared() | |
2e702c99 | 2662 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2663 | } |
2664 | ||
2665 | // For safe ICF, scan a relocation for a global symbol to check if it | |
2666 | // corresponds to a function pointer being taken. In that case mark | |
2667 | // the function whose pointer was taken as not foldable. | |
2668 | ||
fc51264f | 2669 | template<int size> |
21bb3914 | 2670 | inline bool |
fc51264f | 2671 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
2672 | Symbol_table*, |
2673 | Layout* , | |
fc51264f L |
2674 | Target_x86_64<size>* , |
2675 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2676 | unsigned int , |
2677 | Output_section* , | |
fc51264f | 2678 | const elfcpp::Rela<size, false>& , |
21bb3914 ST |
2679 | unsigned int r_type, |
2680 | Symbol* gsym) | |
2681 | { | |
2682 | // When building a shared library, do not fold symbols whose visibility | |
2683 | // is hidden, internal or protected. | |
2684 | return ((parameters->options().shared() | |
2e702c99 | 2685 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
21bb3914 ST |
2686 | || gsym->visibility() == elfcpp::STV_PROTECTED |
2687 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
2e702c99 | 2688 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2689 | } |
2690 | ||
2e30d253 ILT |
2691 | // Scan a relocation for a global symbol. |
2692 | ||
fc51264f | 2693 | template<int size> |
2e30d253 | 2694 | inline void |
fc51264f | 2695 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2696 | Layout* layout, |
2697 | Target_x86_64<size>* target, | |
2698 | Sized_relobj_file<size, false>* object, | |
2699 | unsigned int data_shndx, | |
2700 | Output_section* output_section, | |
2701 | const elfcpp::Rela<size, false>& reloc, | |
2702 | unsigned int r_type, | |
2703 | Symbol* gsym) | |
2e30d253 | 2704 | { |
7223e9ca ILT |
2705 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2706 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2707 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2708 | target->make_plt_entry(symtab, layout, gsym); | |
2709 | ||
2e30d253 ILT |
2710 | switch (r_type) |
2711 | { | |
2712 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2713 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2714 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2715 | break; |
2716 | ||
2717 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
2718 | case elfcpp::R_X86_64_32: |
2719 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 2720 | case elfcpp::R_X86_64_16: |
2e30d253 | 2721 | case elfcpp::R_X86_64_8: |
96f2030e | 2722 | { |
2e702c99 RM |
2723 | // Make a PLT entry if necessary. |
2724 | if (gsym->needs_plt_entry()) | |
2725 | { | |
2726 | target->make_plt_entry(symtab, layout, gsym); | |
2727 | // Since this is not a PC-relative relocation, we may be | |
2728 | // taking the address of a function. In that case we need to | |
2729 | // set the entry in the dynamic symbol table to the address of | |
2730 | // the PLT entry. | |
2731 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2732 | gsym->set_needs_dynsym_value(); | |
2733 | } | |
2734 | // Make a dynamic relocation if necessary. | |
2735 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2736 | { | |
2737 | if (gsym->may_need_copy_reloc()) | |
2738 | { | |
2739 | target->copy_reloc(symtab, layout, object, | |
2740 | data_shndx, output_section, gsym, reloc); | |
2741 | } | |
1bae613c L |
2742 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2743 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
7223e9ca ILT |
2744 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2745 | && gsym->can_use_relative_reloc(false) | |
2746 | && !gsym->is_from_dynobj() | |
2747 | && !gsym->is_undefined() | |
2748 | && !gsym->is_preemptible()) | |
2749 | { | |
2750 | // Use an IRELATIVE reloc for a locally defined | |
2751 | // STT_GNU_IFUNC symbol. This makes a function | |
2752 | // address in a PIE executable match the address in a | |
2753 | // shared library that it links against. | |
67181c72 ILT |
2754 | Reloc_section* rela_dyn = |
2755 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
2756 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
2757 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
2758 | output_section, object, | |
2759 | data_shndx, | |
2760 | reloc.get_r_offset(), | |
2761 | reloc.get_r_addend()); | |
2762 | } | |
b14016f0 L |
2763 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2764 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
2e702c99 RM |
2765 | && gsym->can_use_relative_reloc(false)) |
2766 | { | |
2767 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2768 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
2769 | output_section, object, | |
2770 | data_shndx, | |
2771 | reloc.get_r_offset(), | |
13cf9988 | 2772 | reloc.get_r_addend(), false); |
2e702c99 RM |
2773 | } |
2774 | else | |
2775 | { | |
2776 | this->check_non_pic(object, r_type, gsym); | |
2777 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2778 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2779 | data_shndx, reloc.get_r_offset(), | |
2780 | reloc.get_r_addend()); | |
2781 | } | |
2782 | } | |
d61c6bd4 ILT |
2783 | } |
2784 | break; | |
2785 | ||
2786 | case elfcpp::R_X86_64_PC64: | |
2787 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 2788 | case elfcpp::R_X86_64_PC32_BND: |
d61c6bd4 ILT |
2789 | case elfcpp::R_X86_64_PC16: |
2790 | case elfcpp::R_X86_64_PC8: | |
2791 | { | |
2e702c99 RM |
2792 | // Make a PLT entry if necessary. |
2793 | if (gsym->needs_plt_entry()) | |
2794 | target->make_plt_entry(symtab, layout, gsym); | |
2795 | // Make a dynamic relocation if necessary. | |
2796 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2797 | { | |
2798 | if (gsym->may_need_copy_reloc()) | |
2799 | { | |
2800 | target->copy_reloc(symtab, layout, object, | |
2801 | data_shndx, output_section, gsym, reloc); | |
2802 | } | |
2803 | else | |
2804 | { | |
2805 | this->check_non_pic(object, r_type, gsym); | |
2806 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2807 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2808 | data_shndx, reloc.get_r_offset(), | |
2809 | reloc.get_r_addend()); | |
2810 | } | |
2811 | } | |
d61c6bd4 | 2812 | } |
2e30d253 ILT |
2813 | break; |
2814 | ||
ff006520 | 2815 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 2816 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
2817 | case elfcpp::R_X86_64_GOTPCREL64: |
2818 | case elfcpp::R_X86_64_GOTPCREL: | |
2819 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 | 2820 | { |
2e702c99 RM |
2821 | // The symbol requires a GOT entry. |
2822 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
2823 | if (gsym->final_value_is_known()) | |
7223e9ca ILT |
2824 | { |
2825 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2826 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2827 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2828 | else | |
2829 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2830 | } | |
2e702c99 RM |
2831 | else |
2832 | { | |
2833 | // If this symbol is not fully resolved, we need to add a | |
2834 | // dynamic relocation for it. | |
2835 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
07aa62f2 ILT |
2836 | |
2837 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2838 | // | |
2839 | // 1) The symbol may be defined in some other module. | |
2840 | // | |
2841 | // 2) We are building a shared library and this is a | |
2842 | // protected symbol; using GLOB_DAT means that the dynamic | |
2843 | // linker can use the address of the PLT in the main | |
2844 | // executable when appropriate so that function address | |
2845 | // comparisons work. | |
2846 | // | |
2847 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2848 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
2849 | if (gsym->is_from_dynobj() |
2850 | || gsym->is_undefined() | |
2851 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2852 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2853 | && parameters->options().shared()) | |
7223e9ca ILT |
2854 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2855 | && parameters->options().output_is_position_independent())) | |
2e702c99 | 2856 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
83896202 | 2857 | elfcpp::R_X86_64_GLOB_DAT); |
2e702c99 RM |
2858 | else |
2859 | { | |
7223e9ca ILT |
2860 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2861 | // offset into the GOT, so that function pointer | |
2862 | // comparisons work correctly. | |
2863 | bool is_new; | |
2864 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2865 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2866 | else | |
2867 | { | |
2868 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2869 | // Tell the dynamic linker to use the PLT address | |
2870 | // when resolving relocations. | |
2871 | if (gsym->is_from_dynobj() | |
2872 | && !parameters->options().shared()) | |
2873 | gsym->set_needs_dynsym_value(); | |
2874 | } | |
2e702c99 | 2875 | if (is_new) |
7223e9ca ILT |
2876 | { |
2877 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2878 | rela_dyn->add_global_relative(gsym, | |
2879 | elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 2880 | got, got_off, 0, false); |
7223e9ca | 2881 | } |
2e702c99 RM |
2882 | } |
2883 | } | |
2884 | // For GOTPLT64, we also need a PLT entry (but only if the | |
2885 | // symbol is not fully resolved). | |
2886 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
2887 | && !gsym->final_value_is_known()) | |
2888 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2889 | } |
2890 | break; | |
2891 | ||
2892 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 2893 | case elfcpp::R_X86_64_PLT32_BND: |
2e30d253 ILT |
2894 | // If the symbol is fully resolved, this is just a PC32 reloc. |
2895 | // Otherwise we need a PLT entry. | |
2896 | if (gsym->final_value_is_known()) | |
2897 | break; | |
96f2030e ILT |
2898 | // If building a shared library, we can also skip the PLT entry |
2899 | // if the symbol is defined in the output file and is protected | |
2900 | // or hidden. | |
2901 | if (gsym->is_defined() | |
2e702c99 RM |
2902 | && !gsym->is_from_dynobj() |
2903 | && !gsym->is_preemptible()) | |
96f2030e | 2904 | break; |
2e30d253 ILT |
2905 | target->make_plt_entry(symtab, layout, gsym); |
2906 | break; | |
2907 | ||
fdc2f80f | 2908 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2909 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2910 | case elfcpp::R_X86_64_GOTPC64: |
2911 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2912 | // We need a GOT section. |
2913 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2914 | // For PLTOFF64, we also need a PLT entry (but only if the |
2915 | // symbol is not fully resolved). | |
2916 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
2917 | && !gsym->final_value_is_known()) | |
2918 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2919 | break; |
2920 | ||
2e30d253 ILT |
2921 | case elfcpp::R_X86_64_COPY: |
2922 | case elfcpp::R_X86_64_GLOB_DAT: | |
2923 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2924 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2925 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2926 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 2927 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2928 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 2929 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2930 | gold_error(_("%s: unexpected reloc %u in object file"), |
2931 | object->name().c_str(), r_type); | |
2e30d253 | 2932 | break; |
2e30d253 | 2933 | |
d61c17ea | 2934 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
2935 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2936 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2937 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2938 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2939 | case elfcpp::R_X86_64_DTPOFF32: |
2940 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2941 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2942 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
2943 | { |
2944 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d | 2945 | const tls::Tls_optimization optimized_type |
2e702c99 | 2946 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2947 | switch (r_type) |
2948 | { | |
2e702c99 | 2949 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
2950 | if (optimized_type == tls::TLSOPT_NONE) |
2951 | { | |
2e702c99 RM |
2952 | // Create a pair of GOT entries for the module index and |
2953 | // dtv-relative offset. | |
2954 | Output_data_got<64, false>* got | |
2955 | = target->got_section(symtab, layout); | |
2956 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
83896202 ILT |
2957 | target->rela_dyn_section(layout), |
2958 | elfcpp::R_X86_64_DTPMOD64, | |
2959 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
2960 | } |
2961 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2962 | { | |
2e702c99 RM |
2963 | // Create a GOT entry for the tp-relative offset. |
2964 | Output_data_got<64, false>* got | |
2965 | = target->got_section(symtab, layout); | |
2966 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2967 | target->rela_dyn_section(layout), |
2968 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
2969 | } |
2970 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2971 | unsupported_reloc_global(object, r_type, gsym); | |
2972 | break; | |
2973 | ||
2e702c99 RM |
2974 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2975 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
2976 | if (optimized_type == tls::TLSOPT_NONE) |
2977 | { | |
2e702c99 RM |
2978 | // Create reserved PLT and GOT entries for the resolver. |
2979 | target->reserve_tlsdesc_entries(symtab, layout); | |
2980 | ||
2981 | // Create a double GOT entry with an R_X86_64_TLSDESC | |
2982 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
2983 | // lazily, so the GOT entry needs to be in an area in | |
2984 | // .got.plt, not .got. Call got_section to make sure | |
2985 | // the section has been created. | |
a8df5856 | 2986 | target->got_section(symtab, layout); |
2e702c99 | 2987 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
ca09d69a | 2988 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
2e702c99 | 2989 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
83896202 | 2990 | elfcpp::R_X86_64_TLSDESC, 0); |
c2b45e22 CC |
2991 | } |
2992 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2993 | { | |
2e702c99 RM |
2994 | // Create a GOT entry for the tp-relative offset. |
2995 | Output_data_got<64, false>* got | |
2996 | = target->got_section(symtab, layout); | |
2997 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2998 | target->rela_dyn_section(layout), |
2999 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
3000 | } |
3001 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 3002 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
3003 | break; |
3004 | ||
2e702c99 | 3005 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
3006 | break; |
3007 | ||
2e702c99 | 3008 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
3009 | if (optimized_type == tls::TLSOPT_NONE) |
3010 | { | |
2e702c99 RM |
3011 | // Create a GOT entry for the module index. |
3012 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
3013 | } |
3014 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3015 | unsupported_reloc_global(object, r_type, gsym); | |
3016 | break; | |
3017 | ||
2e702c99 RM |
3018 | case elfcpp::R_X86_64_DTPOFF32: |
3019 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
3020 | break; |
3021 | ||
2e702c99 | 3022 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 3023 | layout->set_has_static_tls(); |
2e702c99 RM |
3024 | if (optimized_type == tls::TLSOPT_NONE) |
3025 | { | |
3026 | // Create a GOT entry for the tp-relative offset. | |
3027 | Output_data_got<64, false>* got | |
3028 | = target->got_section(symtab, layout); | |
3029 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
3030 | target->rela_dyn_section(layout), |
3031 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
3032 | } |
3033 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3034 | unsupported_reloc_global(object, r_type, gsym); | |
3035 | break; | |
0ffd9845 | 3036 | |
2e702c99 | 3037 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3038 | layout->set_has_static_tls(); |
2e702c99 | 3039 | if (parameters->options().shared()) |
b1759dce | 3040 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 | 3041 | break; |
e041f13d | 3042 | |
2e702c99 RM |
3043 | default: |
3044 | gold_unreachable(); | |
2e30d253 ILT |
3045 | } |
3046 | } | |
3047 | break; | |
fdc2f80f ILT |
3048 | |
3049 | case elfcpp::R_X86_64_SIZE32: | |
3050 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3051 | default: |
75f2446e | 3052 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3053 | object->name().c_str(), r_type, |
2e702c99 | 3054 | gsym->demangled_name().c_str()); |
2e30d253 ILT |
3055 | break; |
3056 | } | |
3057 | } | |
3058 | ||
fc51264f | 3059 | template<int size> |
6d03d481 | 3060 | void |
fc51264f L |
3061 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
3062 | Layout* layout, | |
3063 | Sized_relobj_file<size, false>* object, | |
3064 | unsigned int data_shndx, | |
3065 | unsigned int sh_type, | |
3066 | const unsigned char* prelocs, | |
3067 | size_t reloc_count, | |
3068 | Output_section* output_section, | |
3069 | bool needs_special_offset_handling, | |
3070 | size_t local_symbol_count, | |
3071 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
3072 | { |
3073 | ||
3074 | if (sh_type == elfcpp::SHT_REL) | |
3075 | { | |
3076 | return; | |
3077 | } | |
3078 | ||
fc51264f | 3079 | gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
2e702c99 | 3080 | typename Target_x86_64<size>::Scan, |
618d6666 | 3081 | typename Target_x86_64<size>::Relocatable_size_for_reloc>( |
6d03d481 ST |
3082 | symtab, |
3083 | layout, | |
3084 | this, | |
3085 | object, | |
3086 | data_shndx, | |
3087 | prelocs, | |
3088 | reloc_count, | |
3089 | output_section, | |
3090 | needs_special_offset_handling, | |
3091 | local_symbol_count, | |
3092 | plocal_symbols); | |
2e702c99 | 3093 | |
6d03d481 | 3094 | } |
2e30d253 ILT |
3095 | // Scan relocations for a section. |
3096 | ||
fc51264f | 3097 | template<int size> |
2e30d253 | 3098 | void |
fc51264f L |
3099 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
3100 | Layout* layout, | |
3101 | Sized_relobj_file<size, false>* object, | |
3102 | unsigned int data_shndx, | |
3103 | unsigned int sh_type, | |
3104 | const unsigned char* prelocs, | |
3105 | size_t reloc_count, | |
3106 | Output_section* output_section, | |
3107 | bool needs_special_offset_handling, | |
3108 | size_t local_symbol_count, | |
3109 | const unsigned char* plocal_symbols) | |
2e30d253 ILT |
3110 | { |
3111 | if (sh_type == elfcpp::SHT_REL) | |
3112 | { | |
75f2446e ILT |
3113 | gold_error(_("%s: unsupported REL reloc section"), |
3114 | object->name().c_str()); | |
3115 | return; | |
2e30d253 ILT |
3116 | } |
3117 | ||
fc51264f | 3118 | gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
618d6666 | 3119 | typename Target_x86_64<size>::Scan>( |
2e30d253 ILT |
3120 | symtab, |
3121 | layout, | |
3122 | this, | |
3123 | object, | |
3124 | data_shndx, | |
3125 | prelocs, | |
3126 | reloc_count, | |
730cdc88 ILT |
3127 | output_section, |
3128 | needs_special_offset_handling, | |
2e30d253 | 3129 | local_symbol_count, |
730cdc88 | 3130 | plocal_symbols); |
2e30d253 ILT |
3131 | } |
3132 | ||
3133 | // Finalize the sections. | |
3134 | ||
fc51264f | 3135 | template<int size> |
2e30d253 | 3136 | void |
fc51264f | 3137 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
3138 | Layout* layout, |
3139 | const Input_objects*, | |
e785ec03 | 3140 | Symbol_table* symtab) |
2e30d253 | 3141 | { |
ea715a34 ILT |
3142 | const Reloc_section* rel_plt = (this->plt_ == NULL |
3143 | ? NULL | |
e291e7b9 | 3144 | : this->plt_->rela_plt()); |
ea715a34 | 3145 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 3146 | this->rela_dyn_, true, false); |
2e702c99 | 3147 | |
2e30d253 ILT |
3148 | // Fill in some more dynamic tags. |
3149 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
3150 | if (odyn != NULL) | |
3151 | { | |
22b127cc | 3152 | if (this->plt_ != NULL |
ea715a34 ILT |
3153 | && this->plt_->output_section() != NULL |
3154 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 3155 | { |
ea715a34 ILT |
3156 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
3157 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
3158 | this->got_->finalize_data_size(); | |
3159 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
3160 | this->plt_, plt_offset); | |
3161 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
3162 | this->got_, got_offset); | |
2e30d253 ILT |
3163 | } |
3164 | } | |
3165 | ||
3166 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
3167 | // relocs. | |
12c0daef ILT |
3168 | if (this->copy_relocs_.any_saved_relocs()) |
3169 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
3170 | |
3171 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
3172 | // the .got.plt section. | |
3173 | Symbol* sym = this->global_offset_table_; | |
3174 | if (sym != NULL) | |
3175 | { | |
3176 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 3177 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 3178 | } |
28a13fec | 3179 | |
67181c72 ILT |
3180 | if (parameters->doing_static_link() |
3181 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
3182 | { |
3183 | // If linking statically, make sure that the __rela_iplt symbols | |
3184 | // were defined if necessary, even if we didn't create a PLT. | |
3185 | static const Define_symbol_in_segment syms[] = | |
3186 | { | |
3187 | { | |
3188 | "__rela_iplt_start", // name | |
3189 | elfcpp::PT_LOAD, // segment_type | |
3190 | elfcpp::PF_W, // segment_flags_set | |
3191 | elfcpp::PF(0), // segment_flags_clear | |
3192 | 0, // value | |
3193 | 0, // size | |
3194 | elfcpp::STT_NOTYPE, // type | |
3195 | elfcpp::STB_GLOBAL, // binding | |
3196 | elfcpp::STV_HIDDEN, // visibility | |
3197 | 0, // nonvis | |
3198 | Symbol::SEGMENT_START, // offset_from_base | |
3199 | true // only_if_ref | |
3200 | }, | |
3201 | { | |
3202 | "__rela_iplt_end", // name | |
3203 | elfcpp::PT_LOAD, // segment_type | |
3204 | elfcpp::PF_W, // segment_flags_set | |
3205 | elfcpp::PF(0), // segment_flags_clear | |
3206 | 0, // value | |
3207 | 0, // size | |
3208 | elfcpp::STT_NOTYPE, // type | |
3209 | elfcpp::STB_GLOBAL, // binding | |
3210 | elfcpp::STV_HIDDEN, // visibility | |
3211 | 0, // nonvis | |
3212 | Symbol::SEGMENT_START, // offset_from_base | |
3213 | true // only_if_ref | |
3214 | } | |
3215 | }; | |
3216 | ||
3217 | symtab->define_symbols(layout, 2, syms, | |
3218 | layout->script_options()->saw_sections_clause()); | |
3219 | } | |
2e30d253 ILT |
3220 | } |
3221 | ||
3222 | // Perform a relocation. | |
3223 | ||
fc51264f | 3224 | template<int size> |
2e30d253 | 3225 | inline bool |
fc51264f L |
3226 | Target_x86_64<size>::Relocate::relocate( |
3227 | const Relocate_info<size, false>* relinfo, | |
3228 | Target_x86_64<size>* target, | |
3229 | Output_section*, | |
3230 | size_t relnum, | |
3231 | const elfcpp::Rela<size, false>& rela, | |
3232 | unsigned int r_type, | |
3233 | const Sized_symbol<size>* gsym, | |
3234 | const Symbol_value<size>* psymval, | |
3235 | unsigned char* view, | |
3236 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3237 | section_size_type view_size) | |
2e30d253 ILT |
3238 | { |
3239 | if (this->skip_call_tls_get_addr_) | |
3240 | { | |
5efc7cd2 | 3241 | if ((r_type != elfcpp::R_X86_64_PLT32 |
f49fe902 L |
3242 | && r_type != elfcpp::R_X86_64_PLT32_BND |
3243 | && r_type != elfcpp::R_X86_64_PC32_BND | |
2e702c99 | 3244 | && r_type != elfcpp::R_X86_64_PC32) |
2e30d253 | 3245 | || gsym == NULL |
0ffd9845 | 3246 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 3247 | { |
75f2446e ILT |
3248 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3249 | _("missing expected TLS relocation")); | |
3250 | } | |
3251 | else | |
3252 | { | |
3253 | this->skip_call_tls_get_addr_ = false; | |
3254 | return false; | |
2e30d253 | 3255 | } |
2e30d253 ILT |
3256 | } |
3257 | ||
0e804863 ILT |
3258 | if (view == NULL) |
3259 | return true; | |
3260 | ||
fc51264f | 3261 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
3262 | |
3263 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 3264 | Symbol_value<size> symval; |
96f2030e | 3265 | if (gsym != NULL |
95a2c8d6 | 3266 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 3267 | { |
19fec8c1 | 3268 | symval.set_output_value(target->plt_address_for_global(gsym)); |
2e30d253 ILT |
3269 | psymval = &symval; |
3270 | } | |
7223e9ca ILT |
3271 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
3272 | { | |
fc51264f | 3273 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
3274 | if (object->local_has_plt_offset(r_sym)) |
3275 | { | |
19fec8c1 | 3276 | symval.set_output_value(target->plt_address_for_local(object, r_sym)); |
7223e9ca ILT |
3277 | psymval = &symval; |
3278 | } | |
3279 | } | |
2e30d253 | 3280 | |
0ffd9845 ILT |
3281 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
3282 | ||
3283 | // Get the GOT offset if needed. | |
96f2030e ILT |
3284 | // The GOT pointer points to the end of the GOT section. |
3285 | // We need to subtract the size of the GOT section to get | |
3286 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
3287 | bool have_got_offset = false; |
3288 | unsigned int got_offset = 0; | |
3289 | switch (r_type) | |
3290 | { | |
3291 | case elfcpp::R_X86_64_GOT32: | |
3292 | case elfcpp::R_X86_64_GOT64: | |
3293 | case elfcpp::R_X86_64_GOTPLT64: | |
3294 | case elfcpp::R_X86_64_GOTPCREL: | |
3295 | case elfcpp::R_X86_64_GOTPCREL64: | |
3296 | if (gsym != NULL) | |
2e702c99 RM |
3297 | { |
3298 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3299 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
3300 | } | |
0ffd9845 | 3301 | else |
2e702c99 RM |
3302 | { |
3303 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3304 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3305 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3306 | - target->got_size()); | |
3307 | } | |
0ffd9845 ILT |
3308 | have_got_offset = true; |
3309 | break; | |
3310 | ||
3311 | default: | |
3312 | break; | |
3313 | } | |
2e30d253 ILT |
3314 | |
3315 | switch (r_type) | |
3316 | { | |
3317 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3318 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3319 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3320 | break; |
3321 | ||
3322 | case elfcpp::R_X86_64_64: | |
fc51264f | 3323 | Relocate_functions<size, false>::rela64(view, object, psymval, addend); |
2e30d253 ILT |
3324 | break; |
3325 | ||
3326 | case elfcpp::R_X86_64_PC64: | |
fc51264f | 3327 | Relocate_functions<size, false>::pcrela64(view, object, psymval, addend, |
2e702c99 | 3328 | address); |
2e30d253 ILT |
3329 | break; |
3330 | ||
3331 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
3332 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3333 | // uint64_t x = value + addend; | |
3334 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
3335 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
fc51264f | 3336 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3337 | break; |
3338 | ||
3339 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
3340 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3341 | // int64_t x = value + addend; // note this quantity is signed! | |
3342 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
fc51264f | 3343 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3344 | break; |
3345 | ||
3346 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 3347 | case elfcpp::R_X86_64_PC32_BND: |
fc51264f L |
3348 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3349 | address); | |
2e30d253 ILT |
3350 | break; |
3351 | ||
3352 | case elfcpp::R_X86_64_16: | |
fc51264f | 3353 | Relocate_functions<size, false>::rela16(view, object, psymval, addend); |
2e30d253 ILT |
3354 | break; |
3355 | ||
3356 | case elfcpp::R_X86_64_PC16: | |
fc51264f L |
3357 | Relocate_functions<size, false>::pcrela16(view, object, psymval, addend, |
3358 | address); | |
2e30d253 ILT |
3359 | break; |
3360 | ||
3361 | case elfcpp::R_X86_64_8: | |
fc51264f | 3362 | Relocate_functions<size, false>::rela8(view, object, psymval, addend); |
2e30d253 ILT |
3363 | break; |
3364 | ||
3365 | case elfcpp::R_X86_64_PC8: | |
fc51264f L |
3366 | Relocate_functions<size, false>::pcrela8(view, object, psymval, addend, |
3367 | address); | |
2e30d253 ILT |
3368 | break; |
3369 | ||
3370 | case elfcpp::R_X86_64_PLT32: | |
f49fe902 | 3371 | case elfcpp::R_X86_64_PLT32_BND: |
f389a824 | 3372 | gold_assert(gsym == NULL |
2e702c99 | 3373 | || gsym->has_plt_offset() |
99f8faca ILT |
3374 | || gsym->final_value_is_known() |
3375 | || (gsym->is_defined() | |
3376 | && !gsym->is_from_dynobj() | |
3377 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
3378 | // Note: while this code looks the same as for R_X86_64_PC32, it |
3379 | // behaves differently because psymval was set to point to | |
3380 | // the PLT entry, rather than the symbol, in Scan::global(). | |
fc51264f L |
3381 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3382 | address); | |
2e30d253 ILT |
3383 | break; |
3384 | ||
ee9e9e86 ILT |
3385 | case elfcpp::R_X86_64_PLTOFF64: |
3386 | { | |
2e702c99 RM |
3387 | gold_assert(gsym); |
3388 | gold_assert(gsym->has_plt_offset() | |
3389 | || gsym->final_value_is_known()); | |
fc51264f | 3390 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
ee9e9e86 | 3391 | got_address = target->got_section(NULL, NULL)->address(); |
fc51264f L |
3392 | Relocate_functions<size, false>::rela64(view, object, psymval, |
3393 | addend - got_address); | |
ee9e9e86 ILT |
3394 | } |
3395 | ||
2e30d253 | 3396 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 3397 | gold_assert(have_got_offset); |
fc51264f | 3398 | Relocate_functions<size, false>::rela32(view, got_offset, addend); |
2e30d253 ILT |
3399 | break; |
3400 | ||
e822f2b1 ILT |
3401 | case elfcpp::R_X86_64_GOTPC32: |
3402 | { | |
2e702c99 | 3403 | gold_assert(gsym); |
fc51264f | 3404 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3405 | value = target->got_plt_section()->address(); |
fc51264f | 3406 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
e822f2b1 ILT |
3407 | } |
3408 | break; | |
3409 | ||
3410 | case elfcpp::R_X86_64_GOT64: | |
3411 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
3412 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 3413 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 3414 | gold_assert(have_got_offset); |
fc51264f | 3415 | Relocate_functions<size, false>::rela64(view, got_offset, addend); |
e822f2b1 ILT |
3416 | break; |
3417 | ||
3418 | case elfcpp::R_X86_64_GOTPC64: | |
3419 | { | |
2e702c99 | 3420 | gold_assert(gsym); |
fc51264f | 3421 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3422 | value = target->got_plt_section()->address(); |
fc51264f | 3423 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
3424 | } |
3425 | break; | |
3426 | ||
2e30d253 ILT |
3427 | case elfcpp::R_X86_64_GOTOFF64: |
3428 | { | |
fc51264f | 3429 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
2e30d253 | 3430 | value = (psymval->value(object, 0) |
96f2030e | 3431 | - target->got_plt_section()->address()); |
fc51264f | 3432 | Relocate_functions<size, false>::rela64(view, value, addend); |
2e30d253 ILT |
3433 | } |
3434 | break; | |
3435 | ||
3436 | case elfcpp::R_X86_64_GOTPCREL: | |
3437 | { | |
2e702c99 RM |
3438 | gold_assert(have_got_offset); |
3439 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3440 | value = target->got_plt_section()->address() + got_offset; | |
3441 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); | |
2e30d253 ILT |
3442 | } |
3443 | break; | |
3444 | ||
e822f2b1 ILT |
3445 | case elfcpp::R_X86_64_GOTPCREL64: |
3446 | { | |
2e702c99 RM |
3447 | gold_assert(have_got_offset); |
3448 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3449 | value = target->got_plt_section()->address() + got_offset; | |
3450 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); | |
e822f2b1 ILT |
3451 | } |
3452 | break; | |
3453 | ||
2e30d253 ILT |
3454 | case elfcpp::R_X86_64_COPY: |
3455 | case elfcpp::R_X86_64_GLOB_DAT: | |
3456 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3457 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3458 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3459 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3460 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3461 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3462 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3463 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3464 | _("unexpected reloc %u in object file"), | |
3465 | r_type); | |
2e30d253 ILT |
3466 | break; |
3467 | ||
d61c17ea | 3468 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3469 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3470 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3471 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3472 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3473 | case elfcpp::R_X86_64_DTPOFF32: |
3474 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3475 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3476 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 | 3477 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2e702c99 | 3478 | view, address, view_size); |
2e30d253 | 3479 | break; |
2e30d253 | 3480 | |
fdc2f80f ILT |
3481 | case elfcpp::R_X86_64_SIZE32: |
3482 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3483 | default: |
75f2446e ILT |
3484 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3485 | _("unsupported reloc %u"), | |
3486 | r_type); | |
2e30d253 ILT |
3487 | break; |
3488 | } | |
3489 | ||
3490 | return true; | |
3491 | } | |
3492 | ||
3493 | // Perform a TLS relocation. | |
3494 | ||
fc51264f | 3495 | template<int size> |
2e30d253 | 3496 | inline void |
fc51264f L |
3497 | Target_x86_64<size>::Relocate::relocate_tls( |
3498 | const Relocate_info<size, false>* relinfo, | |
3499 | Target_x86_64<size>* target, | |
3500 | size_t relnum, | |
3501 | const elfcpp::Rela<size, false>& rela, | |
3502 | unsigned int r_type, | |
3503 | const Sized_symbol<size>* gsym, | |
3504 | const Symbol_value<size>* psymval, | |
3505 | unsigned char* view, | |
3506 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3507 | section_size_type view_size) | |
2e30d253 | 3508 | { |
2e30d253 | 3509 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 3510 | |
fc51264f | 3511 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 3512 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 3513 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 3514 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 3515 | |
fc51264f | 3516 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
3517 | |
3518 | const bool is_final = (gsym == NULL | |
b3705d2a | 3519 | ? !parameters->options().shared() |
2e30d253 | 3520 | : gsym->final_value_is_known()); |
36171d64 | 3521 | tls::Tls_optimization optimized_type |
fc51264f | 3522 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3523 | switch (r_type) |
3524 | { | |
56622147 | 3525 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
3526 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3527 | { | |
3528 | // If this code sequence is used in a non-executable section, | |
3529 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
3530 | // on the assumption that it's being used by itself in a debug | |
3531 | // section. Therefore, in the unlikely event that the code | |
3532 | // sequence appears in a non-executable section, we simply | |
3533 | // leave it unoptimized. | |
3534 | optimized_type = tls::TLSOPT_NONE; | |
3535 | } | |
e041f13d | 3536 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 3537 | { |
62855347 ILT |
3538 | if (tls_segment == NULL) |
3539 | { | |
191f1a2d ILT |
3540 | gold_assert(parameters->errors()->error_count() > 0 |
3541 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3542 | return; |
3543 | } | |
2e30d253 | 3544 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 3545 | rela, r_type, value, view, |
2e30d253 ILT |
3546 | view_size); |
3547 | break; | |
3548 | } | |
7bf1f802 | 3549 | else |
2e702c99 RM |
3550 | { |
3551 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3552 | ? GOT_TYPE_TLS_OFFSET | |
3553 | : GOT_TYPE_TLS_PAIR); | |
3554 | unsigned int got_offset; | |
3555 | if (gsym != NULL) | |
3556 | { | |
3557 | gold_assert(gsym->has_got_offset(got_type)); | |
3558 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
3559 | } | |
3560 | else | |
3561 | { | |
3562 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3563 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3564 | got_offset = (object->local_got_offset(r_sym, got_type) | |
3565 | - target->got_size()); | |
3566 | } | |
3567 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3568 | { | |
3569 | value = target->got_plt_section()->address() + got_offset; | |
3570 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
3571 | value, view, address, view_size); | |
3572 | break; | |
3573 | } | |
3574 | else if (optimized_type == tls::TLSOPT_NONE) | |
3575 | { | |
3576 | // Relocate the field with the offset of the pair of GOT | |
3577 | // entries. | |
6a41d30b | 3578 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3579 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3580 | address); |
2e702c99 RM |
3581 | break; |
3582 | } | |
3583 | } | |
72ec2876 | 3584 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3585 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
3586 | break; |
3587 | ||
c2b45e22 CC |
3588 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
3589 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
3590 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3591 | { | |
3592 | // See above comment for R_X86_64_TLSGD. | |
3593 | optimized_type = tls::TLSOPT_NONE; | |
3594 | } | |
c2b45e22 CC |
3595 | if (optimized_type == tls::TLSOPT_TO_LE) |
3596 | { | |
62855347 ILT |
3597 | if (tls_segment == NULL) |
3598 | { | |
191f1a2d ILT |
3599 | gold_assert(parameters->errors()->error_count() > 0 |
3600 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3601 | return; |
3602 | } | |
c2b45e22 | 3603 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3604 | rela, r_type, value, view, |
3605 | view_size); | |
c2b45e22 CC |
3606 | break; |
3607 | } | |
3608 | else | |
2e702c99 RM |
3609 | { |
3610 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3611 | ? GOT_TYPE_TLS_OFFSET | |
3612 | : GOT_TYPE_TLS_DESC); | |
3613 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3614 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC |
3615 | && optimized_type == tls::TLSOPT_NONE) | |
3616 | { | |
3617 | // We created GOT entries in the .got.tlsdesc portion of | |
3618 | // the .got.plt section, but the offset stored in the | |
3619 | // symbol is the offset within .got.tlsdesc. | |
3620 | got_offset = (target->got_size() | |
3621 | + target->got_plt_section()->data_size()); | |
3622 | } | |
2e702c99 RM |
3623 | if (gsym != NULL) |
3624 | { | |
3625 | gold_assert(gsym->has_got_offset(got_type)); | |
3626 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3627 | } | |
3628 | else | |
3629 | { | |
3630 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3631 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3632 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3633 | - target->got_size()); |
2e702c99 RM |
3634 | } |
3635 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3636 | { | |
62855347 ILT |
3637 | if (tls_segment == NULL) |
3638 | { | |
191f1a2d ILT |
3639 | gold_assert(parameters->errors()->error_count() > 0 |
3640 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3641 | return; |
3642 | } | |
2e702c99 RM |
3643 | value = target->got_plt_section()->address() + got_offset; |
3644 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
3645 | rela, r_type, value, view, address, | |
3646 | view_size); | |
3647 | break; | |
3648 | } | |
3649 | else if (optimized_type == tls::TLSOPT_NONE) | |
3650 | { | |
3651 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3652 | { | |
3653 | // Relocate the field with the offset of the pair of GOT | |
3654 | // entries. | |
3655 | value = target->got_plt_section()->address() + got_offset; | |
3656 | Relocate_functions<size, false>::pcrela32(view, value, addend, | |
fc51264f | 3657 | address); |
2e702c99 RM |
3658 | } |
3659 | break; | |
3660 | } | |
3661 | } | |
c2b45e22 CC |
3662 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3663 | _("unsupported reloc %u"), r_type); | |
3664 | break; | |
3665 | ||
56622147 | 3666 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
3667 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3668 | { | |
3669 | // See above comment for R_X86_64_TLSGD. | |
3670 | optimized_type = tls::TLSOPT_NONE; | |
3671 | } | |
e041f13d | 3672 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3673 | { |
62855347 ILT |
3674 | if (tls_segment == NULL) |
3675 | { | |
191f1a2d ILT |
3676 | gold_assert(parameters->errors()->error_count() > 0 |
3677 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3678 | return; |
3679 | } | |
72ec2876 ILT |
3680 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
3681 | value, view, view_size); | |
3682 | break; | |
2e702c99 | 3683 | } |
7bf1f802 | 3684 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3685 | { |
3686 | // Relocate the field with the offset of the GOT entry for | |
3687 | // the module index. | |
3688 | unsigned int got_offset; | |
3689 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
31d60480 | 3690 | - target->got_size()); |
6a41d30b | 3691 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3692 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3693 | address); |
2e702c99 RM |
3694 | break; |
3695 | } | |
72ec2876 | 3696 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3697 | _("unsupported reloc %u"), r_type); |
2e30d253 | 3698 | break; |
0ffd9845 ILT |
3699 | |
3700 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
3701 | // This relocation type is used in debugging information. |
3702 | // In that case we need to not optimize the value. If the | |
3703 | // section is not executable, then we assume we should not | |
3704 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
3705 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
3706 | // R_X86_64_TLSLD. | |
3707 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3708 | { | |
62855347 ILT |
3709 | if (tls_segment == NULL) |
3710 | { | |
191f1a2d ILT |
3711 | gold_assert(parameters->errors()->error_count() > 0 |
3712 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3713 | return; |
3714 | } | |
36171d64 CC |
3715 | value -= tls_segment->memsz(); |
3716 | } | |
fc51264f | 3717 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
3718 | break; |
3719 | ||
3720 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
3721 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
3722 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3723 | { | |
62855347 ILT |
3724 | if (tls_segment == NULL) |
3725 | { | |
191f1a2d ILT |
3726 | gold_assert(parameters->errors()->error_count() > 0 |
3727 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3728 | return; |
3729 | } | |
36171d64 CC |
3730 | value -= tls_segment->memsz(); |
3731 | } | |
fc51264f | 3732 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 3733 | break; |
2e30d253 | 3734 | |
56622147 ILT |
3735 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3736 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3737 | { | |
62855347 ILT |
3738 | if (tls_segment == NULL) |
3739 | { | |
191f1a2d ILT |
3740 | gold_assert(parameters->errors()->error_count() > 0 |
3741 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3742 | return; |
3743 | } | |
fc51264f L |
3744 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
3745 | tls_segment, rela, | |
3746 | r_type, value, view, | |
3747 | view_size); | |
56622147 ILT |
3748 | break; |
3749 | } | |
7bf1f802 | 3750 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3751 | { |
3752 | // Relocate the field with the offset of the GOT entry for | |
3753 | // the tp-relative offset of the symbol. | |
3754 | unsigned int got_offset; | |
3755 | if (gsym != NULL) | |
3756 | { | |
3757 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); | |
3758 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
3759 | - target->got_size()); | |
3760 | } | |
3761 | else | |
3762 | { | |
3763 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3764 | gold_assert(object->local_has_got_offset(r_sym, | |
3765 | GOT_TYPE_TLS_OFFSET)); | |
3766 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
3767 | - target->got_size()); | |
3768 | } | |
6a41d30b | 3769 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3770 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3771 | address); |
2e702c99 RM |
3772 | break; |
3773 | } | |
56622147 ILT |
3774 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3775 | _("unsupported reloc type %u"), | |
3776 | r_type); | |
3777 | break; | |
0ffd9845 | 3778 | |
56622147 | 3779 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
3780 | if (tls_segment == NULL) |
3781 | { | |
191f1a2d ILT |
3782 | gold_assert(parameters->errors()->error_count() > 0 |
3783 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3784 | return; |
3785 | } | |
6a41d30b | 3786 | value -= tls_segment->memsz(); |
fc51264f | 3787 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 3788 | break; |
2e30d253 | 3789 | } |
2e30d253 ILT |
3790 | } |
3791 | ||
7bf1f802 ILT |
3792 | // Do a relocation in which we convert a TLS General-Dynamic to an |
3793 | // Initial-Exec. | |
3794 | ||
fc51264f | 3795 | template<int size> |
7bf1f802 | 3796 | inline void |
fc51264f L |
3797 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
3798 | const Relocate_info<size, false>* relinfo, | |
3799 | size_t relnum, | |
3800 | Output_segment*, | |
3801 | const elfcpp::Rela<size, false>& rela, | |
3802 | unsigned int, | |
3803 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3804 | unsigned char* view, | |
3805 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3806 | section_size_type view_size) | |
7bf1f802 | 3807 | { |
41194d9f L |
3808 | // For SIZE == 64: |
3809 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3810 | // .word 0x6666; rex64; call __tls_get_addr | |
3811 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
3812 | // For SIZE == 32: | |
3813 | // leaq foo@tlsgd(%rip),%rdi; | |
3814 | // .word 0x6666; rex64; call __tls_get_addr | |
3815 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax | |
7bf1f802 | 3816 | |
7bf1f802 | 3817 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
7bf1f802 | 3818 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 3819 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
7bf1f802 | 3820 | |
41194d9f L |
3821 | if (size == 64) |
3822 | { | |
3823 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3824 | -4); | |
3825 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3826 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3827 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3828 | 16); | |
3829 | } | |
3830 | else | |
3831 | { | |
3832 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3833 | -3); | |
3834 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3835 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
3836 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3837 | 15); | |
3838 | } | |
7bf1f802 | 3839 | |
c2b45e22 | 3840 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
3841 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
3842 | address); | |
7bf1f802 ILT |
3843 | |
3844 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3845 | // We can skip it. | |
3846 | this->skip_call_tls_get_addr_ = true; | |
3847 | } | |
3848 | ||
e041f13d | 3849 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
3850 | // Local-Exec. |
3851 | ||
fc51264f | 3852 | template<int size> |
2e30d253 | 3853 | inline void |
fc51264f L |
3854 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
3855 | const Relocate_info<size, false>* relinfo, | |
3856 | size_t relnum, | |
3857 | Output_segment* tls_segment, | |
3858 | const elfcpp::Rela<size, false>& rela, | |
3859 | unsigned int, | |
3860 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3861 | unsigned char* view, | |
3862 | section_size_type view_size) | |
2e30d253 | 3863 | { |
41194d9f L |
3864 | // For SIZE == 64: |
3865 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3866 | // .word 0x6666; rex64; call __tls_get_addr | |
3867 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
3868 | // For SIZE == 32: | |
3869 | // leaq foo@tlsgd(%rip),%rdi; | |
3870 | // .word 0x6666; rex64; call __tls_get_addr | |
3871 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 3872 | |
72ec2876 | 3873 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
72ec2876 | 3874 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
41194d9f L |
3875 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
3876 | ||
3877 | if (size == 64) | |
3878 | { | |
3879 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3880 | -4); | |
3881 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3882 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3883 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", | |
3884 | 16); | |
3885 | } | |
3886 | else | |
3887 | { | |
3888 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3889 | -3); | |
3890 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3891 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
2e30d253 | 3892 | |
41194d9f L |
3893 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", |
3894 | 15); | |
3895 | } | |
2e30d253 | 3896 | |
6a41d30b | 3897 | value -= tls_segment->memsz(); |
fc51264f | 3898 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
3899 | |
3900 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3901 | // We can skip it. | |
3902 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3903 | } |
3904 | ||
c2b45e22 CC |
3905 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
3906 | ||
fc51264f | 3907 | template<int size> |
c2b45e22 | 3908 | inline void |
fc51264f L |
3909 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
3910 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3911 | size_t relnum, |
3912 | Output_segment*, | |
fc51264f | 3913 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3914 | unsigned int r_type, |
fc51264f | 3915 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 3916 | unsigned char* view, |
fc51264f | 3917 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
3918 | section_size_type view_size) |
3919 | { | |
3920 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3921 | { | |
3922 | // leaq foo@tlsdesc(%rip), %rax | |
3923 | // ==> movq foo@gottpoff(%rip), %rax | |
3924 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3925 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3926 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3927 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
3928 | view[-2] = 0x8b; |
3929 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 3930 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
3931 | } |
3932 | else | |
3933 | { | |
3934 | // call *foo@tlscall(%rax) | |
3935 | // ==> nop; nop | |
3936 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3937 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3938 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3939 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3940 | view[0] = 0x66; |
3941 | view[1] = 0x90; | |
3942 | } | |
3943 | } | |
3944 | ||
3945 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
3946 | ||
fc51264f | 3947 | template<int size> |
c2b45e22 | 3948 | inline void |
fc51264f L |
3949 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
3950 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3951 | size_t relnum, |
3952 | Output_segment* tls_segment, | |
fc51264f | 3953 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3954 | unsigned int r_type, |
fc51264f | 3955 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
3956 | unsigned char* view, |
3957 | section_size_type view_size) | |
3958 | { | |
3959 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3960 | { | |
3961 | // leaq foo@tlsdesc(%rip), %rax | |
3962 | // ==> movq foo@tpoff, %rax | |
3963 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3964 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3965 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3966 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
3967 | view[-2] = 0xc7; |
3968 | view[-1] = 0xc0; | |
3969 | value -= tls_segment->memsz(); | |
fc51264f | 3970 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
3971 | } |
3972 | else | |
3973 | { | |
3974 | // call *foo@tlscall(%rax) | |
3975 | // ==> nop; nop | |
3976 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3977 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3978 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3979 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3980 | view[0] = 0x66; |
3981 | view[1] = 0x90; | |
3982 | } | |
3983 | } | |
3984 | ||
fc51264f | 3985 | template<int size> |
2e30d253 | 3986 | inline void |
fc51264f L |
3987 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
3988 | const Relocate_info<size, false>* relinfo, | |
3989 | size_t relnum, | |
3990 | Output_segment*, | |
3991 | const elfcpp::Rela<size, false>& rela, | |
3992 | unsigned int, | |
3993 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
3994 | unsigned char* view, | |
3995 | section_size_type view_size) | |
2e30d253 | 3996 | { |
72ec2876 | 3997 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
d2cf1c6c | 3998 | // For SIZE == 64: |
72ec2876 ILT |
3999 | // ... leq foo@dtpoff(%rax),%reg |
4000 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
d2cf1c6c L |
4001 | // For SIZE == 32: |
4002 | // ... leq foo@dtpoff(%rax),%reg | |
4003 | // ==> nopl 0x0(%rax); movl %fs:0,%eax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 4004 | |
72ec2876 ILT |
4005 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
4006 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 4007 | |
72ec2876 | 4008 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 4009 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); |
72ec2876 ILT |
4010 | |
4011 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
4012 | ||
d2cf1c6c L |
4013 | if (size == 64) |
4014 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
4015 | else | |
4016 | memcpy(view - 3, "\x0f\x1f\x40\x00\x64\x8b\x04\x25\0\0\0\0", 12); | |
72ec2876 ILT |
4017 | |
4018 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
4019 | // We can skip it. | |
4020 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
4021 | } |
4022 | ||
56622147 ILT |
4023 | // Do a relocation in which we convert a TLS Initial-Exec to a |
4024 | // Local-Exec. | |
4025 | ||
fc51264f | 4026 | template<int size> |
56622147 | 4027 | inline void |
fc51264f L |
4028 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
4029 | const Relocate_info<size, false>* relinfo, | |
4030 | size_t relnum, | |
4031 | Output_segment* tls_segment, | |
4032 | const elfcpp::Rela<size, false>& rela, | |
4033 | unsigned int, | |
4034 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
4035 | unsigned char* view, | |
4036 | section_size_type view_size) | |
56622147 ILT |
4037 | { |
4038 | // We need to examine the opcodes to figure out which instruction we | |
4039 | // are looking at. | |
4040 | ||
4041 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
4042 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
4043 | ||
4044 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4045 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4046 | ||
4047 | unsigned char op1 = view[-3]; | |
4048 | unsigned char op2 = view[-2]; | |
4049 | unsigned char op3 = view[-1]; | |
4050 | unsigned char reg = op3 >> 3; | |
4051 | ||
4052 | if (op2 == 0x8b) | |
4053 | { | |
4054 | // movq | |
4055 | if (op1 == 0x4c) | |
2e702c99 | 4056 | view[-3] = 0x49; |
56622147 ILT |
4057 | view[-2] = 0xc7; |
4058 | view[-1] = 0xc0 | reg; | |
4059 | } | |
4060 | else if (reg == 4) | |
4061 | { | |
4062 | // Special handling for %rsp. | |
4063 | if (op1 == 0x4c) | |
2e702c99 | 4064 | view[-3] = 0x49; |
56622147 ILT |
4065 | view[-2] = 0x81; |
4066 | view[-1] = 0xc0 | reg; | |
4067 | } | |
4068 | else | |
4069 | { | |
4070 | // addq | |
4071 | if (op1 == 0x4c) | |
2e702c99 | 4072 | view[-3] = 0x4d; |
56622147 ILT |
4073 | view[-2] = 0x8d; |
4074 | view[-1] = 0x80 | reg | (reg << 3); | |
4075 | } | |
4076 | ||
6a41d30b | 4077 | value -= tls_segment->memsz(); |
fc51264f | 4078 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
4079 | } |
4080 | ||
2e30d253 ILT |
4081 | // Relocate section data. |
4082 | ||
fc51264f | 4083 | template<int size> |
2e30d253 | 4084 | void |
fc51264f L |
4085 | Target_x86_64<size>::relocate_section( |
4086 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
4087 | unsigned int sh_type, |
4088 | const unsigned char* prelocs, | |
4089 | size_t reloc_count, | |
4090 | Output_section* output_section, | |
4091 | bool needs_special_offset_handling, | |
4092 | unsigned char* view, | |
fc51264f | 4093 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
4094 | section_size_type view_size, |
4095 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
4096 | { |
4097 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4098 | ||
fc51264f | 4099 | gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
168a4726 AM |
4100 | typename Target_x86_64<size>::Relocate, |
4101 | gold::Default_comdat_behavior>( | |
2e30d253 ILT |
4102 | relinfo, |
4103 | this, | |
4104 | prelocs, | |
4105 | reloc_count, | |
730cdc88 ILT |
4106 | output_section, |
4107 | needs_special_offset_handling, | |
2e30d253 ILT |
4108 | view, |
4109 | address, | |
364c7fa5 ILT |
4110 | view_size, |
4111 | reloc_symbol_changes); | |
2e30d253 ILT |
4112 | } |
4113 | ||
94a3fc8b CC |
4114 | // Apply an incremental relocation. Incremental relocations always refer |
4115 | // to global symbols. | |
4116 | ||
fc51264f | 4117 | template<int size> |
94a3fc8b | 4118 | void |
fc51264f L |
4119 | Target_x86_64<size>::apply_relocation( |
4120 | const Relocate_info<size, false>* relinfo, | |
4121 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 4122 | unsigned int r_type, |
fc51264f | 4123 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
4124 | const Symbol* gsym, |
4125 | unsigned char* view, | |
fc51264f | 4126 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
4127 | section_size_type view_size) |
4128 | { | |
fc51264f | 4129 | gold::apply_relocation<size, false, Target_x86_64<size>, |
618d6666 | 4130 | typename Target_x86_64<size>::Relocate>( |
94a3fc8b CC |
4131 | relinfo, |
4132 | this, | |
4133 | r_offset, | |
4134 | r_type, | |
4135 | r_addend, | |
4136 | gsym, | |
4137 | view, | |
4138 | address, | |
4139 | view_size); | |
4140 | } | |
4141 | ||
6a74a719 ILT |
4142 | // Return the size of a relocation while scanning during a relocatable |
4143 | // link. | |
4144 | ||
fc51264f | 4145 | template<int size> |
6a74a719 | 4146 | unsigned int |
fc51264f | 4147 | Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc( |
6a74a719 ILT |
4148 | unsigned int r_type, |
4149 | Relobj* object) | |
4150 | { | |
4151 | switch (r_type) | |
4152 | { | |
4153 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
4154 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
4155 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
4156 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
4157 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
4158 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
4159 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
4160 | case elfcpp::R_X86_64_DTPOFF32: | |
4161 | case elfcpp::R_X86_64_DTPOFF64: | |
4162 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
4163 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
4164 | return 0; | |
4165 | ||
4166 | case elfcpp::R_X86_64_64: | |
4167 | case elfcpp::R_X86_64_PC64: | |
4168 | case elfcpp::R_X86_64_GOTOFF64: | |
4169 | case elfcpp::R_X86_64_GOTPC64: | |
4170 | case elfcpp::R_X86_64_PLTOFF64: | |
4171 | case elfcpp::R_X86_64_GOT64: | |
4172 | case elfcpp::R_X86_64_GOTPCREL64: | |
4173 | case elfcpp::R_X86_64_GOTPCREL: | |
4174 | case elfcpp::R_X86_64_GOTPLT64: | |
4175 | return 8; | |
4176 | ||
4177 | case elfcpp::R_X86_64_32: | |
4178 | case elfcpp::R_X86_64_32S: | |
4179 | case elfcpp::R_X86_64_PC32: | |
f49fe902 | 4180 | case elfcpp::R_X86_64_PC32_BND: |
6a74a719 | 4181 | case elfcpp::R_X86_64_PLT32: |
f49fe902 | 4182 | case elfcpp::R_X86_64_PLT32_BND: |
6a74a719 ILT |
4183 | case elfcpp::R_X86_64_GOTPC32: |
4184 | case elfcpp::R_X86_64_GOT32: | |
4185 | return 4; | |
4186 | ||
4187 | case elfcpp::R_X86_64_16: | |
4188 | case elfcpp::R_X86_64_PC16: | |
4189 | return 2; | |
4190 | ||
4191 | case elfcpp::R_X86_64_8: | |
4192 | case elfcpp::R_X86_64_PC8: | |
4193 | return 1; | |
4194 | ||
4195 | case elfcpp::R_X86_64_COPY: | |
4196 | case elfcpp::R_X86_64_GLOB_DAT: | |
4197 | case elfcpp::R_X86_64_JUMP_SLOT: | |
4198 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 4199 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
4200 | // These are outstanding tls relocs, which are unexpected when linking |
4201 | case elfcpp::R_X86_64_TPOFF64: | |
4202 | case elfcpp::R_X86_64_DTPMOD64: | |
4203 | case elfcpp::R_X86_64_TLSDESC: | |
4204 | object->error(_("unexpected reloc %u in object file"), r_type); | |
4205 | return 0; | |
4206 | ||
4207 | case elfcpp::R_X86_64_SIZE32: | |
4208 | case elfcpp::R_X86_64_SIZE64: | |
4209 | default: | |
4210 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
4211 | return 0; | |
4212 | } | |
4213 | } | |
4214 | ||
4215 | // Scan the relocs during a relocatable link. | |
4216 | ||
fc51264f | 4217 | template<int size> |
6a74a719 | 4218 | void |
fc51264f L |
4219 | Target_x86_64<size>::scan_relocatable_relocs( |
4220 | Symbol_table* symtab, | |
4221 | Layout* layout, | |
4222 | Sized_relobj_file<size, false>* object, | |
4223 | unsigned int data_shndx, | |
4224 | unsigned int sh_type, | |
4225 | const unsigned char* prelocs, | |
4226 | size_t reloc_count, | |
4227 | Output_section* output_section, | |
4228 | bool needs_special_offset_handling, | |
4229 | size_t local_symbol_count, | |
4230 | const unsigned char* plocal_symbols, | |
4231 | Relocatable_relocs* rr) | |
6a74a719 ILT |
4232 | { |
4233 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4234 | ||
4235 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
4236 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
4237 | ||
fc51264f | 4238 | gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA, |
6a74a719 | 4239 | Scan_relocatable_relocs>( |
6a74a719 ILT |
4240 | symtab, |
4241 | layout, | |
4242 | object, | |
4243 | data_shndx, | |
4244 | prelocs, | |
4245 | reloc_count, | |
4246 | output_section, | |
4247 | needs_special_offset_handling, | |
4248 | local_symbol_count, | |
4249 | plocal_symbols, | |
4250 | rr); | |
4251 | } | |
4252 | ||
4253 | // Relocate a section during a relocatable link. | |
4254 | ||
fc51264f | 4255 | template<int size> |
6a74a719 | 4256 | void |
7404fe1b | 4257 | Target_x86_64<size>::relocate_relocs( |
fc51264f | 4258 | const Relocate_info<size, false>* relinfo, |
6a74a719 ILT |
4259 | unsigned int sh_type, |
4260 | const unsigned char* prelocs, | |
4261 | size_t reloc_count, | |
4262 | Output_section* output_section, | |
62fe925a | 4263 | typename elfcpp::Elf_types<size>::Elf_Off offset_in_output_section, |
6a74a719 ILT |
4264 | const Relocatable_relocs* rr, |
4265 | unsigned char* view, | |
fc51264f | 4266 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
4267 | section_size_type view_size, |
4268 | unsigned char* reloc_view, | |
4269 | section_size_type reloc_view_size) | |
4270 | { | |
4271 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4272 | ||
7404fe1b | 4273 | gold::relocate_relocs<size, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
4274 | relinfo, |
4275 | prelocs, | |
4276 | reloc_count, | |
4277 | output_section, | |
4278 | offset_in_output_section, | |
4279 | rr, | |
4280 | view, | |
4281 | view_address, | |
4282 | view_size, | |
4283 | reloc_view, | |
4284 | reloc_view_size); | |
4285 | } | |
4286 | ||
4fb6c25d ILT |
4287 | // Return the value to use for a dynamic which requires special |
4288 | // treatment. This is how we support equality comparisons of function | |
4289 | // pointers across shared library boundaries, as described in the | |
4290 | // processor specific ABI supplement. | |
4291 | ||
fc51264f | 4292 | template<int size> |
4fb6c25d | 4293 | uint64_t |
fc51264f | 4294 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
4295 | { |
4296 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
19fec8c1 | 4297 | return this->plt_address_for_global(gsym); |
4fb6c25d ILT |
4298 | } |
4299 | ||
2e30d253 ILT |
4300 | // Return a string used to fill a code section with nops to take up |
4301 | // the specified length. | |
4302 | ||
fc51264f | 4303 | template<int size> |
2e30d253 | 4304 | std::string |
fc51264f | 4305 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
4306 | { |
4307 | if (length >= 16) | |
4308 | { | |
4309 | // Build a jmpq instruction to skip over the bytes. | |
4310 | unsigned char jmp[5]; | |
4311 | jmp[0] = 0xe9; | |
04bf7072 | 4312 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 | 4313 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2e702c99 | 4314 | + std::string(length - 5, static_cast<char>(0x90))); |
2e30d253 ILT |
4315 | } |
4316 | ||
4317 | // Nop sequences of various lengths. | |
76677ad0 CC |
4318 | const char nop1[1] = { '\x90' }; // nop |
4319 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
4320 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
4321 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
2e702c99 | 4322 | '\x00'}; |
76677ad0 CC |
4323 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) |
4324 | '\x00', '\x00' }; | |
4325 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
2e702c99 | 4326 | '\x44', '\x00', '\x00' }; |
76677ad0 | 4327 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) |
2e702c99 | 4328 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4329 | '\x00' }; |
4330 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
2e702c99 | 4331 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4332 | '\x00', '\x00' }; |
4333 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
2e702c99 | 4334 | '\x84', '\x00', '\x00', |
76677ad0 CC |
4335 | '\x00', '\x00', '\x00' }; |
4336 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
2e702c99 | 4337 | '\x1f', '\x84', '\x00', |
76677ad0 CC |
4338 | '\x00', '\x00', '\x00', |
4339 | '\x00' }; | |
4340 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
2e702c99 | 4341 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4342 | '\x00', '\x00', '\x00', |
4343 | '\x00', '\x00' }; | |
4344 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
2e702c99 | 4345 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4346 | '\x84', '\x00', '\x00', |
4347 | '\x00', '\x00', '\x00' }; | |
4348 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
2e702c99 | 4349 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4350 | '\x1f', '\x84', '\x00', |
4351 | '\x00', '\x00', '\x00', | |
2e702c99 | 4352 | '\x00' }; |
76677ad0 | 4353 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4354 | '\x66', '\x66', '\x2e', // data16 |
76677ad0 CC |
4355 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
4356 | '\x00', '\x00', '\x00', | |
2e702c99 | 4357 | '\x00', '\x00' }; |
76677ad0 | 4358 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4359 | '\x66', '\x66', '\x66', // data16; data16 |
76677ad0 CC |
4360 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
4361 | '\x84', '\x00', '\x00', | |
2e702c99 | 4362 | '\x00', '\x00', '\x00' }; |
2e30d253 ILT |
4363 | |
4364 | const char* nops[16] = { | |
4365 | NULL, | |
4366 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
4367 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
4368 | }; | |
4369 | ||
4370 | return std::string(nops[length], length); | |
4371 | } | |
4372 | ||
e291e7b9 ILT |
4373 | // Return the addend to use for a target specific relocation. The |
4374 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
4375 | // symbol. We want to set the addend is the offset of the local | |
4376 | // symbol in the TLS segment. | |
4377 | ||
fc51264f | 4378 | template<int size> |
e291e7b9 | 4379 | uint64_t |
fc51264f L |
4380 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
4381 | uint64_t) const | |
e291e7b9 ILT |
4382 | { |
4383 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
4384 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
4385 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
4386 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 4387 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
4388 | gold_assert(psymval->is_tls_symbol()); |
4389 | // The value of a TLS symbol is the offset in the TLS segment. | |
4390 | return psymval->value(ti.object, 0); | |
4391 | } | |
4392 | ||
02d7cd44 ILT |
4393 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
4394 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
4395 | // assembler can not write out the difference between two labels in | |
4396 | // different sections, so instead of using a pc-relative value they | |
4397 | // use an offset from the GOT. | |
4398 | ||
fc51264f | 4399 | template<int size> |
02d7cd44 | 4400 | uint64_t |
fc51264f | 4401 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
4402 | { |
4403 | gold_assert(this->global_offset_table_ != NULL); | |
4404 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 4405 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
4406 | return ssym->value(); |
4407 | } | |
4408 | ||
364c7fa5 | 4409 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 4410 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
4411 | // code. We have to change the function so that it always ensures |
4412 | // that it has enough stack space to run some random function. | |
4413 | ||
fc51264f | 4414 | template<int size> |
364c7fa5 | 4415 | void |
fc51264f L |
4416 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
4417 | section_offset_type fnoffset, | |
4418 | section_size_type fnsize, | |
4419 | unsigned char* view, | |
4420 | section_size_type view_size, | |
4421 | std::string* from, | |
4422 | std::string* to) const | |
364c7fa5 ILT |
4423 | { |
4424 | // The function starts with a comparison of the stack pointer and a | |
4425 | // field in the TCB. This is followed by a jump. | |
4426 | ||
4427 | // cmp %fs:NN,%rsp | |
4428 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
4429 | && fnsize > 9) | |
4430 | { | |
4431 | // We will call __morestack if the carry flag is set after this | |
4432 | // comparison. We turn the comparison into an stc instruction | |
4433 | // and some nops. | |
4434 | view[fnoffset] = '\xf9'; | |
4435 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
4436 | } | |
4437 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
4438 | // lea NN(%rsp),%r11 |
4439 | else if ((this->match_view(view, view_size, fnoffset, | |
4440 | "\x4c\x8d\x94\x24", 4) | |
4441 | || this->match_view(view, view_size, fnoffset, | |
4442 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
4443 | && fnsize > 8) |
4444 | { | |
4445 | // This is loading an offset from the stack pointer for a | |
4446 | // comparison. The offset is negative, so we decrease the | |
4447 | // offset by the amount of space we need for the stack. This | |
4448 | // means we will avoid calling __morestack if there happens to | |
4449 | // be plenty of space on the stack already. | |
4450 | unsigned char* pval = view + fnoffset + 4; | |
4451 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
4452 | val -= parameters->options().split_stack_adjust_size(); | |
4453 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
4454 | } | |
4455 | else | |
4456 | { | |
4457 | if (!object->has_no_split_stack()) | |
4458 | object->error(_("failed to match split-stack sequence at " | |
4459 | "section %u offset %0zx"), | |
ac33a407 | 4460 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
4461 | return; |
4462 | } | |
4463 | ||
4464 | // We have to change the function so that it calls | |
4465 | // __morestack_non_split instead of __morestack. The former will | |
4466 | // allocate additional stack space. | |
4467 | *from = "__morestack"; | |
4468 | *to = "__morestack_non_split"; | |
4469 | } | |
4470 | ||
2e702c99 RM |
4471 | // The selector for x86_64 object files. Note this is never instantiated |
4472 | // directly. It's only used in Target_selector_x86_64_nacl, below. | |
2e30d253 | 4473 | |
fc51264f | 4474 | template<int size> |
36959681 | 4475 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
4476 | { |
4477 | public: | |
4478 | Target_selector_x86_64() | |
fc51264f | 4479 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
2e702c99 | 4480 | (size == 64 |
fc51264f | 4481 | ? "elf64-x86-64" : "elf32-x86-64"), |
2e702c99 | 4482 | (size == 64 |
fc51264f L |
4483 | ? "elf64-x86-64-freebsd" |
4484 | : "elf32-x86-64-freebsd"), | |
4485 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
4486 | { } |
4487 | ||
4488 | Target* | |
e96caa79 | 4489 | do_instantiate_target() |
fc51264f | 4490 | { return new Target_x86_64<size>(); } |
36959681 | 4491 | |
2e30d253 ILT |
4492 | }; |
4493 | ||
2e702c99 RM |
4494 | // NaCl variant. It uses different PLT contents. |
4495 | ||
4496 | template<int size> | |
4497 | class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size> | |
4498 | { | |
4499 | public: | |
4500 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4501 | Output_data_got<64, false>* got, | |
4502 | Output_data_space* got_plt, | |
4503 | Output_data_space* got_irelative) | |
4504 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4505 | got, got_plt, got_irelative) | |
4506 | { } | |
4507 | ||
4508 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4509 | Output_data_got<64, false>* got, | |
4510 | Output_data_space* got_plt, | |
4511 | Output_data_space* got_irelative, | |
4512 | unsigned int plt_count) | |
4513 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4514 | got, got_plt, got_irelative, | |
4515 | plt_count) | |
4516 | { } | |
4517 | ||
4518 | protected: | |
4519 | virtual unsigned int | |
4520 | do_get_plt_entry_size() const | |
4521 | { return plt_entry_size; } | |
4522 | ||
4523 | virtual void | |
4524 | do_add_eh_frame(Layout* layout) | |
4525 | { | |
4526 | layout->add_eh_frame_for_plt(this, | |
4527 | this->plt_eh_frame_cie, | |
4528 | this->plt_eh_frame_cie_size, | |
4529 | plt_eh_frame_fde, | |
4530 | plt_eh_frame_fde_size); | |
4531 | } | |
4532 | ||
4533 | virtual void | |
4534 | do_fill_first_plt_entry(unsigned char* pov, | |
4535 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
4536 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
4537 | ||
4538 | virtual unsigned int | |
4539 | do_fill_plt_entry(unsigned char* pov, | |
4540 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4541 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4542 | unsigned int got_offset, | |
4543 | unsigned int plt_offset, | |
4544 | unsigned int plt_index); | |
4545 | ||
4546 | virtual void | |
4547 | do_fill_tlsdesc_entry(unsigned char* pov, | |
4548 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4549 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4550 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4551 | unsigned int tlsdesc_got_offset, | |
4552 | unsigned int plt_offset); | |
4553 | ||
4554 | private: | |
4555 | // The size of an entry in the PLT. | |
4556 | static const int plt_entry_size = 64; | |
4557 | ||
4558 | // The first entry in the PLT. | |
4559 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4560 | ||
4561 | // Other entries in the PLT for an executable. | |
4562 | static const unsigned char plt_entry[plt_entry_size]; | |
4563 | ||
4564 | // The reserved TLSDESC entry in the PLT for an executable. | |
4565 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
4566 | ||
4567 | // The .eh_frame unwind information for the PLT. | |
4568 | static const int plt_eh_frame_fde_size = 32; | |
4569 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
4570 | }; | |
4571 | ||
4572 | template<int size> | |
4573 | class Target_x86_64_nacl : public Target_x86_64<size> | |
4574 | { | |
4575 | public: | |
4576 | Target_x86_64_nacl() | |
4577 | : Target_x86_64<size>(&x86_64_nacl_info) | |
4578 | { } | |
4579 | ||
4580 | virtual Output_data_plt_x86_64<size>* | |
4581 | do_make_data_plt(Layout* layout, | |
4582 | Output_data_got<64, false>* got, | |
4583 | Output_data_space* got_plt, | |
4584 | Output_data_space* got_irelative) | |
4585 | { | |
4586 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4587 | got_irelative); | |
4588 | } | |
4589 | ||
4590 | virtual Output_data_plt_x86_64<size>* | |
4591 | do_make_data_plt(Layout* layout, | |
4592 | Output_data_got<64, false>* got, | |
4593 | Output_data_space* got_plt, | |
4594 | Output_data_space* got_irelative, | |
4595 | unsigned int plt_count) | |
4596 | { | |
4597 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4598 | got_irelative, | |
4599 | plt_count); | |
4600 | } | |
4601 | ||
93f8221c RM |
4602 | virtual std::string |
4603 | do_code_fill(section_size_type length) const; | |
4604 | ||
2e702c99 RM |
4605 | private: |
4606 | static const Target::Target_info x86_64_nacl_info; | |
4607 | }; | |
4608 | ||
4609 | template<> | |
4610 | const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info = | |
4611 | { | |
4612 | 64, // size | |
4613 | false, // is_big_endian | |
4614 | elfcpp::EM_X86_64, // machine_code | |
4615 | false, // has_make_symbol | |
4616 | false, // has_resolve | |
4617 | true, // has_code_fill | |
4618 | true, // is_default_stack_executable | |
4619 | true, // can_icf_inline_merge_sections | |
4620 | '\0', // wrap_char | |
4621 | "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker | |
4622 | 0x20000, // default_text_segment_address | |
4623 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4624 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4625 | true, // isolate_execinstr | |
4626 | 0x10000000, // rosegment_gap | |
4627 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4628 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4629 | 0, // small_common_section_flags | |
4630 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4631 | NULL, // attributes_section | |
a67858e0 CC |
4632 | NULL, // attributes_vendor |
4633 | "_start" // entry_symbol_name | |
2e702c99 RM |
4634 | }; |
4635 | ||
4636 | template<> | |
4637 | const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info = | |
4638 | { | |
4639 | 32, // size | |
4640 | false, // is_big_endian | |
4641 | elfcpp::EM_X86_64, // machine_code | |
4642 | false, // has_make_symbol | |
4643 | false, // has_resolve | |
4644 | true, // has_code_fill | |
4645 | true, // is_default_stack_executable | |
4646 | true, // can_icf_inline_merge_sections | |
4647 | '\0', // wrap_char | |
4648 | "/lib/ld-nacl-x86-64.so.1", // dynamic_linker | |
4649 | 0x20000, // default_text_segment_address | |
4650 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4651 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4652 | true, // isolate_execinstr | |
4653 | 0x10000000, // rosegment_gap | |
4654 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4655 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4656 | 0, // small_common_section_flags | |
4657 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4658 | NULL, // attributes_section | |
a67858e0 CC |
4659 | NULL, // attributes_vendor |
4660 | "_start" // entry_symbol_name | |
2e702c99 RM |
4661 | }; |
4662 | ||
4663 | #define NACLMASK 0xe0 // 32-byte alignment mask. | |
4664 | ||
4665 | // The first entry in the PLT. | |
4666 | ||
4667 | template<int size> | |
4668 | const unsigned char | |
4669 | Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] = | |
4670 | { | |
4671 | 0xff, 0x35, // pushq contents of memory address | |
4672 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4673 | 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11 | |
4674 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
4675 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4676 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4677 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4678 | ||
4679 | // 9-byte nop sequence to pad out to the next 32-byte boundary. | |
dd0845d7 | 4680 | 0x66, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw 0x0(%rax,%rax,1) |
2e702c99 RM |
4681 | |
4682 | // 32 bytes of nop to pad out to the standard size | |
4683 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4684 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4685 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4686 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4687 | 0x66, // excess data32 prefix | |
4688 | 0x90 // nop | |
4689 | }; | |
4690 | ||
4691 | template<int size> | |
4692 | void | |
4693 | Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry( | |
4694 | unsigned char* pov, | |
4695 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4696 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
4697 | { | |
4698 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4699 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4700 | (got_address + 8 | |
4701 | - (plt_address + 2 + 4))); | |
4702 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4703 | (got_address + 16 | |
4704 | - (plt_address + 9 + 4))); | |
4705 | } | |
4706 | ||
4707 | // Subsequent entries in the PLT. | |
4708 | ||
4709 | template<int size> | |
4710 | const unsigned char | |
4711 | Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] = | |
4712 | { | |
4713 | 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11 | |
4714 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4715 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4716 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4717 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4718 | ||
4719 | // 15-byte nop sequence to pad out to the next 32-byte boundary. | |
4720 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4721 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4722 | ||
4723 | // Lazy GOT entries point here (32-byte aligned). | |
4724 | 0x68, // pushq immediate | |
4725 | 0, 0, 0, 0, // replaced with index into relocation table | |
4726 | 0xe9, // jmp relative | |
4727 | 0, 0, 0, 0, // replaced with offset to start of .plt0 | |
4728 | ||
4729 | // 22 bytes of nop to pad out to the standard size. | |
4730 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4731 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4732 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax) | |
4733 | }; | |
4734 | ||
4735 | template<int size> | |
4736 | unsigned int | |
4737 | Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry( | |
4738 | unsigned char* pov, | |
4739 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4740 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4741 | unsigned int got_offset, | |
4742 | unsigned int plt_offset, | |
4743 | unsigned int plt_index) | |
4744 | { | |
4745 | memcpy(pov, plt_entry, plt_entry_size); | |
4746 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, | |
4747 | (got_address + got_offset | |
4748 | - (plt_address + plt_offset | |
4749 | + 3 + 4))); | |
4750 | ||
4751 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index); | |
4752 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 38, | |
4753 | - (plt_offset + 38 + 4)); | |
4754 | ||
4755 | return 32; | |
4756 | } | |
4757 | ||
4758 | // The reserved TLSDESC entry in the PLT. | |
4759 | ||
4760 | template<int size> | |
4761 | const unsigned char | |
4762 | Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] = | |
4763 | { | |
4764 | 0xff, 0x35, // pushq x(%rip) | |
4765 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
4766 | 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11 | |
4767 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
4768 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4769 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4770 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4771 | ||
4772 | // 41 bytes of nop to pad out to the standard size. | |
4773 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4774 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4775 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4776 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4777 | 0x66, 0x66, // excess data32 prefixes | |
4778 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4779 | }; | |
4780 | ||
4781 | template<int size> | |
4782 | void | |
4783 | Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry( | |
4784 | unsigned char* pov, | |
4785 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4786 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4787 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4788 | unsigned int tlsdesc_got_offset, | |
4789 | unsigned int plt_offset) | |
4790 | { | |
4791 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
4792 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4793 | (got_address + 8 | |
4794 | - (plt_address + plt_offset | |
4795 | + 2 + 4))); | |
4796 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4797 | (got_base | |
4798 | + tlsdesc_got_offset | |
4799 | - (plt_address + plt_offset | |
4800 | + 9 + 4))); | |
4801 | } | |
4802 | ||
4803 | // The .eh_frame unwind information for the PLT. | |
4804 | ||
4805 | template<int size> | |
4806 | const unsigned char | |
4807 | Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4808 | { | |
4809 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4810 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4811 | 0, // Augmentation size. | |
4812 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
4813 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4814 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
4815 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4816 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4817 | 13, // Block length. | |
4818 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
4819 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
4820 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4821 | elfcpp::DW_OP_and, // & (%rip & 0x3f). | |
4822 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4823 | elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25) | |
4824 | elfcpp::DW_OP_lit3, // Push 3. | |
4825 | elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3) | |
4826 | elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8 | |
4827 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4828 | elfcpp::DW_CFA_nop | |
4829 | }; | |
4830 | ||
93f8221c RM |
4831 | // Return a string used to fill a code section with nops. |
4832 | // For NaCl, long NOPs are only valid if they do not cross | |
4833 | // bundle alignment boundaries, so keep it simple with one-byte NOPs. | |
4834 | template<int size> | |
4835 | std::string | |
4836 | Target_x86_64_nacl<size>::do_code_fill(section_size_type length) const | |
4837 | { | |
4838 | return std::string(length, static_cast<char>(0x90)); | |
4839 | } | |
4840 | ||
2e702c99 RM |
4841 | // The selector for x86_64-nacl object files. |
4842 | ||
4843 | template<int size> | |
4844 | class Target_selector_x86_64_nacl | |
4845 | : public Target_selector_nacl<Target_selector_x86_64<size>, | |
4846 | Target_x86_64_nacl<size> > | |
4847 | { | |
4848 | public: | |
4849 | Target_selector_x86_64_nacl() | |
4850 | : Target_selector_nacl<Target_selector_x86_64<size>, | |
4851 | Target_x86_64_nacl<size> >("x86-64", | |
4852 | size == 64 | |
4853 | ? "elf64-x86-64-nacl" | |
4854 | : "elf32-x86-64-nacl", | |
4855 | size == 64 | |
4856 | ? "elf_x86_64_nacl" | |
4857 | : "elf32_x86_64_nacl") | |
4858 | { } | |
4859 | }; | |
4860 | ||
4861 | Target_selector_x86_64_nacl<64> target_selector_x86_64; | |
4862 | Target_selector_x86_64_nacl<32> target_selector_x32; | |
2e30d253 ILT |
4863 | |
4864 | } // End anonymous namespace. |