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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
9dee3b3c ILT |
3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
4 | // Free Software Foundation, Inc. | |
2e30d253 ILT |
5 | // Written by Ian Lance Taylor <iant@google.com>. |
6 | ||
7 | // This file is part of gold. | |
8 | ||
8b105e34 ILT |
9 | // This program is free software; you can redistribute it and/or modify |
10 | // it under the terms of the GNU General Public License as published by | |
11 | // the Free Software Foundation; either version 3 of the License, or | |
2e30d253 ILT |
12 | // (at your option) any later version. |
13 | ||
8b105e34 ILT |
14 | // This program is distributed in the hope that it will be useful, |
15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | // GNU General Public License for more details. | |
18 | ||
19 | // You should have received a copy of the GNU General Public License | |
20 | // along with this program; if not, write to the Free Software | |
21 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
22 | // MA 02110-1301, USA. | |
2e30d253 ILT |
23 | |
24 | #include "gold.h" | |
25 | ||
26 | #include <cstring> | |
27 | ||
28 | #include "elfcpp.h" | |
07a60597 | 29 | #include "dwarf.h" |
2e30d253 ILT |
30 | #include "parameters.h" |
31 | #include "reloc.h" | |
32 | #include "x86_64.h" | |
33 | #include "object.h" | |
34 | #include "symtab.h" | |
35 | #include "layout.h" | |
36 | #include "output.h" | |
12c0daef | 37 | #include "copy-relocs.h" |
2e30d253 ILT |
38 | #include "target.h" |
39 | #include "target-reloc.h" | |
40 | #include "target-select.h" | |
e041f13d | 41 | #include "tls.h" |
36959681 | 42 | #include "freebsd.h" |
2e702c99 | 43 | #include "nacl.h" |
f345227a | 44 | #include "gc.h" |
21bb3914 | 45 | #include "icf.h" |
2e30d253 ILT |
46 | |
47 | namespace | |
48 | { | |
49 | ||
50 | using namespace gold; | |
51 | ||
7223e9ca | 52 | // A class to handle the PLT data. |
2e702c99 RM |
53 | // This is an abstract base class that handles most of the linker details |
54 | // but does not know the actual contents of PLT entries. The derived | |
55 | // classes below fill in those details. | |
7223e9ca | 56 | |
fc51264f | 57 | template<int size> |
7223e9ca ILT |
58 | class Output_data_plt_x86_64 : public Output_section_data |
59 | { | |
60 | public: | |
fc51264f | 61 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
7223e9ca | 62 | |
2e702c99 RM |
63 | Output_data_plt_x86_64(Layout* layout, uint64_t addralign, |
64 | Output_data_got<64, false>* got, | |
4829d394 | 65 | Output_data_space* got_plt, |
67181c72 | 66 | Output_data_space* got_irelative) |
2e702c99 | 67 | : Output_section_data(addralign), layout_(layout), tlsdesc_rel_(NULL), |
7d172687 ILT |
68 | irelative_rel_(NULL), got_(got), got_plt_(got_plt), |
69 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
70 | tlsdesc_got_offset_(-1U), free_list_() | |
67181c72 ILT |
71 | { this->init(layout); } |
72 | ||
2e702c99 RM |
73 | Output_data_plt_x86_64(Layout* layout, uint64_t plt_entry_size, |
74 | Output_data_got<64, false>* got, | |
67181c72 ILT |
75 | Output_data_space* got_plt, |
76 | Output_data_space* got_irelative, | |
4829d394 | 77 | unsigned int plt_count) |
2e702c99 RM |
78 | : Output_section_data((plt_count + 1) * plt_entry_size, |
79 | plt_entry_size, false), | |
7d172687 ILT |
80 | layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got), |
81 | got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count), | |
82 | irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_() | |
4829d394 | 83 | { |
67181c72 | 84 | this->init(layout); |
4829d394 CC |
85 | |
86 | // Initialize the free list and reserve the first entry. | |
87 | this->free_list_.init((plt_count + 1) * plt_entry_size, false); | |
88 | this->free_list_.remove(0, plt_entry_size); | |
89 | } | |
90 | ||
91 | // Initialize the PLT section. | |
92 | void | |
67181c72 | 93 | init(Layout* layout); |
7223e9ca ILT |
94 | |
95 | // Add an entry to the PLT. | |
96 | void | |
67181c72 | 97 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
98 | |
99 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
100 | unsigned int | |
67181c72 | 101 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, |
fc51264f | 102 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
103 | unsigned int local_sym_index); |
104 | ||
4829d394 CC |
105 | // Add the relocation for a PLT entry. |
106 | void | |
67181c72 ILT |
107 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, |
108 | unsigned int got_offset); | |
4829d394 | 109 | |
7223e9ca ILT |
110 | // Add the reserved TLSDESC_PLT entry to the PLT. |
111 | void | |
112 | reserve_tlsdesc_entry(unsigned int got_offset) | |
113 | { this->tlsdesc_got_offset_ = got_offset; } | |
114 | ||
115 | // Return true if a TLSDESC_PLT entry has been reserved. | |
116 | bool | |
117 | has_tlsdesc_entry() const | |
118 | { return this->tlsdesc_got_offset_ != -1U; } | |
119 | ||
120 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
121 | unsigned int | |
122 | get_tlsdesc_got_offset() const | |
123 | { return this->tlsdesc_got_offset_; } | |
124 | ||
125 | // Return the offset of the reserved TLSDESC_PLT entry. | |
126 | unsigned int | |
127 | get_tlsdesc_plt_offset() const | |
2e702c99 RM |
128 | { |
129 | return ((this->count_ + this->irelative_count_ + 1) | |
130 | * this->get_plt_entry_size()); | |
131 | } | |
7223e9ca ILT |
132 | |
133 | // Return the .rela.plt section data. | |
134 | Reloc_section* | |
135 | rela_plt() | |
136 | { return this->rel_; } | |
137 | ||
138 | // Return where the TLSDESC relocations should go. | |
139 | Reloc_section* | |
140 | rela_tlsdesc(Layout*); | |
141 | ||
67181c72 ILT |
142 | // Return where the IRELATIVE relocations should go in the PLT |
143 | // relocations. | |
144 | Reloc_section* | |
145 | rela_irelative(Symbol_table*, Layout*); | |
146 | ||
147 | // Return whether we created a section for IRELATIVE relocations. | |
148 | bool | |
149 | has_irelative_section() const | |
150 | { return this->irelative_rel_ != NULL; } | |
151 | ||
7223e9ca ILT |
152 | // Return the number of PLT entries. |
153 | unsigned int | |
154 | entry_count() const | |
67181c72 | 155 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
156 | |
157 | // Return the offset of the first non-reserved PLT entry. | |
2e702c99 | 158 | unsigned int |
7223e9ca | 159 | first_plt_entry_offset() |
2e702c99 | 160 | { return this->get_plt_entry_size(); } |
7223e9ca ILT |
161 | |
162 | // Return the size of a PLT entry. | |
2e702c99 RM |
163 | unsigned int |
164 | get_plt_entry_size() const | |
165 | { return this->do_get_plt_entry_size(); } | |
7223e9ca | 166 | |
4829d394 CC |
167 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
168 | void | |
169 | reserve_slot(unsigned int plt_index) | |
170 | { | |
2e702c99 RM |
171 | this->free_list_.remove((plt_index + 1) * this->get_plt_entry_size(), |
172 | (plt_index + 2) * this->get_plt_entry_size()); | |
4829d394 CC |
173 | } |
174 | ||
67181c72 ILT |
175 | // Return the PLT address to use for a global symbol. |
176 | uint64_t | |
177 | address_for_global(const Symbol*); | |
178 | ||
179 | // Return the PLT address to use for a local symbol. | |
180 | uint64_t | |
181 | address_for_local(const Relobj*, unsigned int symndx); | |
182 | ||
2e702c99 RM |
183 | // Add .eh_frame information for the PLT. |
184 | void | |
185 | add_eh_frame(Layout* layout) | |
186 | { this->do_add_eh_frame(layout); } | |
187 | ||
7223e9ca | 188 | protected: |
2e702c99 RM |
189 | // Fill in the first PLT entry. |
190 | void | |
191 | fill_first_plt_entry(unsigned char* pov, | |
192 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
193 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
194 | { this->do_fill_first_plt_entry(pov, got_address, plt_address); } | |
195 | ||
196 | // Fill in a normal PLT entry. Returns the offset into the entry that | |
197 | // should be the initial GOT slot value. | |
198 | unsigned int | |
199 | fill_plt_entry(unsigned char* pov, | |
200 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
201 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
202 | unsigned int got_offset, | |
203 | unsigned int plt_offset, | |
204 | unsigned int plt_index) | |
205 | { | |
206 | return this->do_fill_plt_entry(pov, got_address, plt_address, | |
207 | got_offset, plt_offset, plt_index); | |
208 | } | |
209 | ||
210 | // Fill in the reserved TLSDESC PLT entry. | |
211 | void | |
212 | fill_tlsdesc_entry(unsigned char* pov, | |
213 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
214 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
215 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
216 | unsigned int tlsdesc_got_offset, | |
217 | unsigned int plt_offset) | |
218 | { | |
219 | this->do_fill_tlsdesc_entry(pov, got_address, plt_address, got_base, | |
220 | tlsdesc_got_offset, plt_offset); | |
221 | } | |
222 | ||
223 | virtual unsigned int | |
224 | do_get_plt_entry_size() const = 0; | |
225 | ||
226 | virtual void | |
227 | do_fill_first_plt_entry(unsigned char* pov, | |
228 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
229 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr) | |
230 | = 0; | |
231 | ||
232 | virtual unsigned int | |
233 | do_fill_plt_entry(unsigned char* pov, | |
234 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
235 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
236 | unsigned int got_offset, | |
237 | unsigned int plt_offset, | |
238 | unsigned int plt_index) = 0; | |
239 | ||
240 | virtual void | |
241 | do_fill_tlsdesc_entry(unsigned char* pov, | |
242 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
243 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
244 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
245 | unsigned int tlsdesc_got_offset, | |
246 | unsigned int plt_offset) = 0; | |
247 | ||
248 | virtual void | |
249 | do_add_eh_frame(Layout* layout) = 0; | |
250 | ||
7223e9ca ILT |
251 | void |
252 | do_adjust_output_section(Output_section* os); | |
253 | ||
254 | // Write to a map file. | |
255 | void | |
256 | do_print_to_mapfile(Mapfile* mapfile) const | |
257 | { mapfile->print_output_data(this, _("** PLT")); } | |
258 | ||
2e702c99 | 259 | // The CIE of the .eh_frame unwind information for the PLT. |
07a60597 | 260 | static const int plt_eh_frame_cie_size = 16; |
07a60597 | 261 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; |
7223e9ca | 262 | |
2e702c99 | 263 | private: |
7223e9ca ILT |
264 | // Set the final size. |
265 | void | |
266 | set_final_data_size(); | |
267 | ||
268 | // Write out the PLT data. | |
269 | void | |
270 | do_write(Output_file*); | |
271 | ||
7d172687 ILT |
272 | // A pointer to the Layout class, so that we can find the .dynamic |
273 | // section when we write out the GOT PLT section. | |
274 | Layout* layout_; | |
7223e9ca ILT |
275 | // The reloc section. |
276 | Reloc_section* rel_; | |
277 | // The TLSDESC relocs, if necessary. These must follow the regular | |
278 | // PLT relocs. | |
279 | Reloc_section* tlsdesc_rel_; | |
67181c72 ILT |
280 | // The IRELATIVE relocs, if necessary. These must follow the |
281 | // regular PLT relocations and the TLSDESC relocations. | |
282 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
283 | // The .got section. |
284 | Output_data_got<64, false>* got_; | |
285 | // The .got.plt section. | |
286 | Output_data_space* got_plt_; | |
67181c72 ILT |
287 | // The part of the .got.plt section used for IRELATIVE relocs. |
288 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
289 | // The number of PLT entries. |
290 | unsigned int count_; | |
67181c72 ILT |
291 | // Number of PLT entries with R_X86_64_IRELATIVE relocs. These |
292 | // follow the regular PLT entries. | |
293 | unsigned int irelative_count_; | |
7223e9ca ILT |
294 | // Offset of the reserved TLSDESC_GOT entry when needed. |
295 | unsigned int tlsdesc_got_offset_; | |
4829d394 CC |
296 | // List of available regions within the section, for incremental |
297 | // update links. | |
298 | Free_list free_list_; | |
7223e9ca | 299 | }; |
2e30d253 | 300 | |
2e702c99 RM |
301 | template<int size> |
302 | class Output_data_plt_x86_64_standard : public Output_data_plt_x86_64<size> | |
303 | { | |
304 | public: | |
305 | Output_data_plt_x86_64_standard(Layout* layout, | |
306 | Output_data_got<64, false>* got, | |
307 | Output_data_space* got_plt, | |
308 | Output_data_space* got_irelative) | |
309 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
310 | got, got_plt, got_irelative) | |
311 | { } | |
312 | ||
313 | Output_data_plt_x86_64_standard(Layout* layout, | |
314 | Output_data_got<64, false>* got, | |
315 | Output_data_space* got_plt, | |
316 | Output_data_space* got_irelative, | |
317 | unsigned int plt_count) | |
318 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
319 | got, got_plt, got_irelative, | |
320 | plt_count) | |
321 | { } | |
322 | ||
323 | protected: | |
324 | virtual unsigned int | |
325 | do_get_plt_entry_size() const | |
326 | { return plt_entry_size; } | |
327 | ||
328 | virtual void | |
329 | do_add_eh_frame(Layout* layout) | |
330 | { | |
331 | layout->add_eh_frame_for_plt(this, | |
332 | this->plt_eh_frame_cie, | |
333 | this->plt_eh_frame_cie_size, | |
334 | plt_eh_frame_fde, | |
335 | plt_eh_frame_fde_size); | |
336 | } | |
337 | ||
338 | virtual void | |
339 | do_fill_first_plt_entry(unsigned char* pov, | |
340 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
341 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
342 | ||
343 | virtual unsigned int | |
344 | do_fill_plt_entry(unsigned char* pov, | |
345 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
346 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
347 | unsigned int got_offset, | |
348 | unsigned int plt_offset, | |
349 | unsigned int plt_index); | |
350 | ||
351 | virtual void | |
352 | do_fill_tlsdesc_entry(unsigned char* pov, | |
353 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
354 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
355 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
356 | unsigned int tlsdesc_got_offset, | |
357 | unsigned int plt_offset); | |
358 | ||
359 | private: | |
360 | // The size of an entry in the PLT. | |
361 | static const int plt_entry_size = 16; | |
362 | ||
363 | // The first entry in the PLT. | |
364 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
365 | // procedure linkage table for both programs and shared objects." | |
366 | static const unsigned char first_plt_entry[plt_entry_size]; | |
367 | ||
368 | // Other entries in the PLT for an executable. | |
369 | static const unsigned char plt_entry[plt_entry_size]; | |
370 | ||
371 | // The reserved TLSDESC entry in the PLT for an executable. | |
372 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
373 | ||
374 | // The .eh_frame unwind information for the PLT. | |
375 | static const int plt_eh_frame_fde_size = 32; | |
376 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
377 | }; | |
378 | ||
2e30d253 | 379 | // The x86_64 target class. |
d61c17ea ILT |
380 | // See the ABI at |
381 | // http://www.x86-64.org/documentation/abi.pdf | |
382 | // TLS info comes from | |
383 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 384 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 385 | |
fc51264f L |
386 | template<int size> |
387 | class Target_x86_64 : public Sized_target<size, false> | |
2e30d253 ILT |
388 | { |
389 | public: | |
e822f2b1 ILT |
390 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
391 | // uses only Elf64_Rela relocation entries with explicit addends." | |
fc51264f | 392 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
2e30d253 | 393 | |
2e702c99 RM |
394 | Target_x86_64(const Target::Target_info* info = &x86_64_info) |
395 | : Sized_target<size, false>(info), | |
67181c72 ILT |
396 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
397 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
398 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), | |
399 | dynbss_(NULL), got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), | |
e291e7b9 | 400 | tls_base_symbol_defined_(false) |
2e30d253 ILT |
401 | { } |
402 | ||
8a5e3e08 ILT |
403 | // Hook for a new output section. |
404 | void | |
405 | do_new_output_section(Output_section*) const; | |
406 | ||
6d03d481 ST |
407 | // Scan the relocations to look for symbol adjustments. |
408 | void | |
ad0f2072 | 409 | gc_process_relocs(Symbol_table* symtab, |
2e702c99 RM |
410 | Layout* layout, |
411 | Sized_relobj_file<size, false>* object, | |
412 | unsigned int data_shndx, | |
413 | unsigned int sh_type, | |
414 | const unsigned char* prelocs, | |
415 | size_t reloc_count, | |
416 | Output_section* output_section, | |
417 | bool needs_special_offset_handling, | |
418 | size_t local_symbol_count, | |
419 | const unsigned char* plocal_symbols); | |
6d03d481 | 420 | |
2e30d253 ILT |
421 | // Scan the relocations to look for symbol adjustments. |
422 | void | |
ad0f2072 | 423 | scan_relocs(Symbol_table* symtab, |
2e30d253 | 424 | Layout* layout, |
fc51264f | 425 | Sized_relobj_file<size, false>* object, |
2e30d253 ILT |
426 | unsigned int data_shndx, |
427 | unsigned int sh_type, | |
428 | const unsigned char* prelocs, | |
429 | size_t reloc_count, | |
730cdc88 ILT |
430 | Output_section* output_section, |
431 | bool needs_special_offset_handling, | |
2e30d253 | 432 | size_t local_symbol_count, |
730cdc88 | 433 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
434 | |
435 | // Finalize the sections. | |
436 | void | |
f59f41f3 | 437 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 438 | |
4fb6c25d ILT |
439 | // Return the value to use for a dynamic which requires special |
440 | // treatment. | |
441 | uint64_t | |
442 | do_dynsym_value(const Symbol*) const; | |
443 | ||
2e30d253 ILT |
444 | // Relocate a section. |
445 | void | |
fc51264f | 446 | relocate_section(const Relocate_info<size, false>*, |
2e30d253 ILT |
447 | unsigned int sh_type, |
448 | const unsigned char* prelocs, | |
449 | size_t reloc_count, | |
730cdc88 ILT |
450 | Output_section* output_section, |
451 | bool needs_special_offset_handling, | |
2e30d253 | 452 | unsigned char* view, |
fc51264f | 453 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
364c7fa5 ILT |
454 | section_size_type view_size, |
455 | const Reloc_symbol_changes*); | |
2e30d253 | 456 | |
6a74a719 ILT |
457 | // Scan the relocs during a relocatable link. |
458 | void | |
ad0f2072 | 459 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 460 | Layout* layout, |
fc51264f | 461 | Sized_relobj_file<size, false>* object, |
6a74a719 ILT |
462 | unsigned int data_shndx, |
463 | unsigned int sh_type, | |
464 | const unsigned char* prelocs, | |
465 | size_t reloc_count, | |
466 | Output_section* output_section, | |
467 | bool needs_special_offset_handling, | |
468 | size_t local_symbol_count, | |
469 | const unsigned char* plocal_symbols, | |
470 | Relocatable_relocs*); | |
471 | ||
472 | // Relocate a section during a relocatable link. | |
473 | void | |
fc51264f L |
474 | relocate_for_relocatable( |
475 | const Relocate_info<size, false>*, | |
476 | unsigned int sh_type, | |
477 | const unsigned char* prelocs, | |
478 | size_t reloc_count, | |
479 | Output_section* output_section, | |
480 | off_t offset_in_output_section, | |
481 | const Relocatable_relocs*, | |
482 | unsigned char* view, | |
483 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
484 | section_size_type view_size, | |
485 | unsigned char* reloc_view, | |
486 | section_size_type reloc_view_size); | |
6a74a719 | 487 | |
2e30d253 ILT |
488 | // Return a string used to fill a code section with nops. |
489 | std::string | |
8851ecca | 490 | do_code_fill(section_size_type length) const; |
2e30d253 | 491 | |
9a2d6984 ILT |
492 | // Return whether SYM is defined by the ABI. |
493 | bool | |
9c2d0ef9 | 494 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
495 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
496 | ||
e291e7b9 ILT |
497 | // Return the symbol index to use for a target specific relocation. |
498 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
499 | // local symbol, which is an absolute reloc. | |
500 | unsigned int | |
501 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
502 | { | |
503 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
504 | return 0; | |
505 | } | |
506 | ||
507 | // Return the addend to use for a target specific relocation. | |
508 | uint64_t | |
509 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
510 | ||
7223e9ca | 511 | // Return the PLT section. |
67181c72 ILT |
512 | uint64_t |
513 | do_plt_address_for_global(const Symbol* gsym) const | |
514 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 515 | |
67181c72 ILT |
516 | uint64_t |
517 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
518 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 519 | |
b3ce541e ILT |
520 | // This function should be defined in targets that can use relocation |
521 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
522 | // and global_reloc_may_be_function_pointer) | |
523 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
524 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
525 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
526 | bool | |
527 | do_can_check_for_function_pointers() const | |
528 | { return !parameters->options().pie(); } | |
529 | ||
02d7cd44 ILT |
530 | // Return the base for a DW_EH_PE_datarel encoding. |
531 | uint64_t | |
532 | do_ehframe_datarel_base() const; | |
533 | ||
9b547ce6 | 534 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
535 | void |
536 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
537 | section_offset_type fnoffset, section_size_type fnsize, | |
538 | unsigned char* view, section_size_type view_size, | |
539 | std::string* from, std::string* to) const; | |
540 | ||
96f2030e | 541 | // Return the size of the GOT section. |
fe8718a4 | 542 | section_size_type |
0e70b911 | 543 | got_size() const |
96f2030e ILT |
544 | { |
545 | gold_assert(this->got_ != NULL); | |
546 | return this->got_->data_size(); | |
547 | } | |
548 | ||
0e70b911 CC |
549 | // Return the number of entries in the GOT. |
550 | unsigned int | |
551 | got_entry_count() const | |
552 | { | |
553 | if (this->got_ == NULL) | |
554 | return 0; | |
555 | return this->got_size() / 8; | |
556 | } | |
557 | ||
558 | // Return the number of entries in the PLT. | |
559 | unsigned int | |
560 | plt_entry_count() const; | |
561 | ||
562 | // Return the offset of the first non-reserved PLT entry. | |
563 | unsigned int | |
564 | first_plt_entry_offset() const; | |
565 | ||
566 | // Return the size of each PLT entry. | |
567 | unsigned int | |
568 | plt_entry_size() const; | |
569 | ||
4829d394 | 570 | // Create the GOT section for an incremental update. |
dd74ae06 | 571 | Output_data_got_base* |
4829d394 CC |
572 | init_got_plt_for_update(Symbol_table* symtab, |
573 | Layout* layout, | |
574 | unsigned int got_count, | |
575 | unsigned int plt_count); | |
576 | ||
6fa2a40b CC |
577 | // Reserve a GOT entry for a local symbol, and regenerate any |
578 | // necessary dynamic relocations. | |
579 | void | |
580 | reserve_local_got_entry(unsigned int got_index, | |
2e702c99 | 581 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
582 | unsigned int r_sym, |
583 | unsigned int got_type); | |
584 | ||
585 | // Reserve a GOT entry for a global symbol, and regenerate any | |
586 | // necessary dynamic relocations. | |
587 | void | |
588 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
589 | unsigned int got_type); | |
590 | ||
4829d394 | 591 | // Register an existing PLT entry for a global symbol. |
4829d394 | 592 | void |
67181c72 ILT |
593 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
594 | Symbol* gsym); | |
4829d394 | 595 | |
26d3c67d CC |
596 | // Force a COPY relocation for a given symbol. |
597 | void | |
598 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
599 | ||
94a3fc8b CC |
600 | // Apply an incremental relocation. |
601 | void | |
fc51264f L |
602 | apply_relocation(const Relocate_info<size, false>* relinfo, |
603 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 604 | unsigned int r_type, |
fc51264f | 605 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
606 | const Symbol* gsym, |
607 | unsigned char* view, | |
fc51264f | 608 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
609 | section_size_type view_size); |
610 | ||
e291e7b9 ILT |
611 | // Add a new reloc argument, returning the index in the vector. |
612 | size_t | |
fc51264f | 613 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
614 | { |
615 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
616 | return this->tlsdesc_reloc_info_.size() - 1; | |
617 | } | |
618 | ||
2e702c99 RM |
619 | Output_data_plt_x86_64<size>* |
620 | make_data_plt(Layout* layout, | |
621 | Output_data_got<64, false>* got, | |
622 | Output_data_space* got_plt, | |
623 | Output_data_space* got_irelative) | |
624 | { | |
625 | return this->do_make_data_plt(layout, got, got_plt, got_irelative); | |
626 | } | |
627 | ||
628 | Output_data_plt_x86_64<size>* | |
629 | make_data_plt(Layout* layout, | |
630 | Output_data_got<64, false>* got, | |
631 | Output_data_space* got_plt, | |
632 | Output_data_space* got_irelative, | |
633 | unsigned int plt_count) | |
634 | { | |
635 | return this->do_make_data_plt(layout, got, got_plt, got_irelative, | |
636 | plt_count); | |
637 | } | |
638 | ||
639 | virtual Output_data_plt_x86_64<size>* | |
640 | do_make_data_plt(Layout* layout, | |
641 | Output_data_got<64, false>* got, | |
642 | Output_data_space* got_plt, | |
643 | Output_data_space* got_irelative) | |
644 | { | |
645 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
646 | got_irelative); | |
647 | } | |
648 | ||
649 | virtual Output_data_plt_x86_64<size>* | |
650 | do_make_data_plt(Layout* layout, | |
651 | Output_data_got<64, false>* got, | |
652 | Output_data_space* got_plt, | |
653 | Output_data_space* got_irelative, | |
654 | unsigned int plt_count) | |
655 | { | |
656 | return new Output_data_plt_x86_64_standard<size>(layout, got, got_plt, | |
657 | got_irelative, | |
658 | plt_count); | |
659 | } | |
660 | ||
2e30d253 ILT |
661 | private: |
662 | // The class which scans relocations. | |
a036edd8 | 663 | class Scan |
2e30d253 | 664 | { |
a036edd8 ILT |
665 | public: |
666 | Scan() | |
667 | : issued_non_pic_error_(false) | |
668 | { } | |
669 | ||
95a2c8d6 RS |
670 | static inline int |
671 | get_reference_flags(unsigned int r_type); | |
672 | ||
2e30d253 | 673 | inline void |
ad0f2072 | 674 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 675 | Sized_relobj_file<size, false>* object, |
2e30d253 | 676 | unsigned int data_shndx, |
07f397ab | 677 | Output_section* output_section, |
fc51264f L |
678 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
679 | const elfcpp::Sym<size, false>& lsym); | |
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_; |
2e30d253 ILT |
974 | // Space for variables copied with a COPY reloc. |
975 | Output_data_space* dynbss_; | |
c2b45e22 | 976 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 977 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
978 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
979 | // specific relocation. Here we store the object and local symbol | |
980 | // index for the relocation. | |
981 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
982 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
983 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
984 | }; |
985 | ||
fc51264f L |
986 | template<> |
987 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
988 | { |
989 | 64, // size | |
990 | false, // is_big_endian | |
991 | elfcpp::EM_X86_64, // machine_code | |
992 | false, // has_make_symbol | |
993 | false, // has_resolve | |
994 | true, // has_code_fill | |
35cdfc9a | 995 | true, // is_default_stack_executable |
b3ce541e | 996 | true, // can_icf_inline_merge_sections |
0864d551 | 997 | '\0', // wrap_char |
2e30d253 | 998 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 999 | 0x400000, // default_text_segment_address |
cd72c291 | 1000 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 | 1001 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
2e702c99 RM |
1002 | false, // isolate_execinstr |
1003 | 0, // rosegment_gap | |
8a5e3e08 ILT |
1004 | elfcpp::SHN_UNDEF, // small_common_shndx |
1005 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1006 | 0, // small_common_section_flags | |
05a352e6 DK |
1007 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
1008 | NULL, // attributes_section | |
1009 | NULL // attributes_vendor | |
2e30d253 ILT |
1010 | }; |
1011 | ||
fc51264f L |
1012 | template<> |
1013 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
1014 | { | |
1015 | 32, // size | |
1016 | false, // is_big_endian | |
1017 | elfcpp::EM_X86_64, // machine_code | |
1018 | false, // has_make_symbol | |
1019 | false, // has_resolve | |
1020 | true, // has_code_fill | |
1021 | true, // is_default_stack_executable | |
1022 | true, // can_icf_inline_merge_sections | |
1023 | '\0', // wrap_char | |
1024 | "/libx32/ldx32.so.1", // program interpreter | |
1025 | 0x400000, // default_text_segment_address | |
1026 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
1027 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
2e702c99 RM |
1028 | false, // isolate_execinstr |
1029 | 0, // rosegment_gap | |
fc51264f L |
1030 | elfcpp::SHN_UNDEF, // small_common_shndx |
1031 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
1032 | 0, // small_common_section_flags | |
1033 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
1034 | NULL, // attributes_section | |
1035 | NULL // attributes_vendor | |
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(); |
67181c72 ILT |
1387 | return this->address() + offset; |
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 |
fc51264f | 1395 | Output_data_plt_x86_64<size>::address_for_local(const Relobj*, unsigned int) |
67181c72 | 1396 | { |
2e702c99 | 1397 | return this->address() + (this->count_ + 1) * this->get_plt_entry_size(); |
67181c72 ILT |
1398 | } |
1399 | ||
c2b45e22 | 1400 | // Set the final size. |
fc51264f | 1401 | template<int size> |
c2b45e22 | 1402 | void |
fc51264f | 1403 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1404 | { |
67181c72 | 1405 | unsigned int count = this->count_ + this->irelative_count_; |
c2b45e22 CC |
1406 | if (this->has_tlsdesc_entry()) |
1407 | ++count; | |
2e702c99 | 1408 | this->set_data_size((count + 1) * this->get_plt_entry_size()); |
c2b45e22 CC |
1409 | } |
1410 | ||
2e30d253 ILT |
1411 | // The first entry in the PLT for an executable. |
1412 | ||
fc51264f L |
1413 | template<int size> |
1414 | const unsigned char | |
2e702c99 | 1415 | Output_data_plt_x86_64_standard<size>::first_plt_entry[plt_entry_size] = |
2e30d253 ILT |
1416 | { |
1417 | // From AMD64 ABI Draft 0.98, page 76 | |
1418 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1419 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1420 | 0xff, 0x25, // jmp indirect |
1421 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1422 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1423 | }; | |
1424 | ||
2e702c99 RM |
1425 | template<int size> |
1426 | void | |
1427 | Output_data_plt_x86_64_standard<size>::do_fill_first_plt_entry( | |
1428 | unsigned char* pov, | |
1429 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1430 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
1431 | { | |
1432 | memcpy(pov, first_plt_entry, plt_entry_size); | |
1433 | // We do a jmp relative to the PC at the end of this instruction. | |
1434 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1435 | (got_address + 8 | |
1436 | - (plt_address + 6))); | |
1437 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1438 | (got_address + 16 | |
1439 | - (plt_address + 12))); | |
1440 | } | |
1441 | ||
2e30d253 ILT |
1442 | // Subsequent entries in the PLT for an executable. |
1443 | ||
fc51264f L |
1444 | template<int size> |
1445 | const unsigned char | |
2e702c99 | 1446 | Output_data_plt_x86_64_standard<size>::plt_entry[plt_entry_size] = |
2e30d253 ILT |
1447 | { |
1448 | // From AMD64 ABI Draft 0.98, page 76 | |
1449 | 0xff, 0x25, // jmpq indirect | |
1450 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1451 | 0x68, // pushq immediate | |
1452 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1453 | 0xe9, // jmpq relative | |
1454 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1455 | }; | |
1456 | ||
2e702c99 RM |
1457 | template<int size> |
1458 | unsigned int | |
1459 | Output_data_plt_x86_64_standard<size>::do_fill_plt_entry( | |
1460 | unsigned char* pov, | |
1461 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1462 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1463 | unsigned int got_offset, | |
1464 | unsigned int plt_offset, | |
1465 | unsigned int plt_index) | |
1466 | { | |
1467 | memcpy(pov, plt_entry, plt_entry_size); | |
1468 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1469 | (got_address + got_offset | |
1470 | - (plt_address + plt_offset | |
1471 | + 6))); | |
1472 | ||
1473 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1474 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1475 | - (plt_offset + plt_entry_size)); | |
1476 | ||
1477 | return 6; | |
1478 | } | |
1479 | ||
c2b45e22 CC |
1480 | // The reserved TLSDESC entry in the PLT for an executable. |
1481 | ||
fc51264f L |
1482 | template<int size> |
1483 | const unsigned char | |
2e702c99 | 1484 | Output_data_plt_x86_64_standard<size>::tlsdesc_plt_entry[plt_entry_size] = |
c2b45e22 CC |
1485 | { |
1486 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1487 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1488 | 0xff, 0x35, // pushq x(%rip) | |
1489 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1490 | 0xff, 0x25, // jmpq *y(%rip) | |
1491 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1492 | 0x0f, 0x1f, // nop | |
1493 | 0x40, 0 | |
1494 | }; | |
1495 | ||
2e702c99 RM |
1496 | template<int size> |
1497 | void | |
1498 | Output_data_plt_x86_64_standard<size>::do_fill_tlsdesc_entry( | |
1499 | unsigned char* pov, | |
1500 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
1501 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
1502 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
1503 | unsigned int tlsdesc_got_offset, | |
1504 | unsigned int plt_offset) | |
1505 | { | |
1506 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1507 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1508 | (got_address + 8 | |
1509 | - (plt_address + plt_offset | |
1510 | + 6))); | |
1511 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1512 | (got_base | |
1513 | + tlsdesc_got_offset | |
1514 | - (plt_address + plt_offset | |
1515 | + 12))); | |
1516 | } | |
1517 | ||
07a60597 ILT |
1518 | // The .eh_frame unwind information for the PLT. |
1519 | ||
fc51264f | 1520 | template<int size> |
2e702c99 | 1521 | const unsigned char |
fc51264f | 1522 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
1523 | { |
1524 | 1, // CIE version. | |
1525 | 'z', // Augmentation: augmentation size included. | |
1526 | 'R', // Augmentation: FDE encoding included. | |
1527 | '\0', // End of augmentation string. | |
1528 | 1, // Code alignment factor. | |
1529 | 0x78, // Data alignment factor. | |
1530 | 16, // Return address column. | |
1531 | 1, // Augmentation size. | |
1532 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1533 | | elfcpp::DW_EH_PE_sdata4), | |
1534 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
1535 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
1536 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1537 | elfcpp::DW_CFA_nop | |
1538 | }; | |
1539 | ||
fc51264f | 1540 | template<int size> |
07a60597 | 1541 | const unsigned char |
2e702c99 | 1542 | Output_data_plt_x86_64_standard<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1543 | { |
1544 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1545 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1546 | 0, // Augmentation size. | |
1547 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
1548 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1549 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
1550 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1551 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1552 | 11, // Block length. | |
1553 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
1554 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
1555 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1556 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
1557 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1558 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
1559 | elfcpp::DW_OP_lit3, // Push 3. | |
1560 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
1561 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
1562 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
1563 | elfcpp::DW_CFA_nop, | |
1564 | elfcpp::DW_CFA_nop, | |
1565 | elfcpp::DW_CFA_nop | |
1566 | }; | |
1567 | ||
2e30d253 ILT |
1568 | // Write out the PLT. This uses the hand-coded instructions above, |
1569 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
1570 | ||
fc51264f | 1571 | template<int size> |
2e30d253 | 1572 | void |
fc51264f | 1573 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 1574 | { |
2ea97941 | 1575 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1576 | const section_size_type oview_size = |
1577 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1578 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
1579 | |
1580 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1581 | gold_assert(parameters->incremental_update() |
1582 | || (got_file_offset + this->got_plt_->data_size() | |
1583 | == this->got_irelative_->offset())); | |
fe8718a4 | 1584 | const section_size_type got_size = |
67181c72 ILT |
1585 | convert_to_section_size_type(this->got_plt_->data_size() |
1586 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
1587 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1588 | got_size); | |
1589 | ||
1590 | unsigned char* pov = oview; | |
1591 | ||
c2b45e22 | 1592 | // The base address of the .plt section. |
fc51264f | 1593 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 1594 | // The base address of the .got section. |
fc51264f | 1595 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
1596 | // The base address of the PLT portion of the .got section, |
1597 | // which is where the GOT pointer will point, and where the | |
1598 | // three reserved GOT entries are located. | |
fc51264f L |
1599 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
1600 | = this->got_plt_->address(); | |
2e30d253 | 1601 | |
2e702c99 RM |
1602 | this->fill_first_plt_entry(pov, got_address, plt_address); |
1603 | pov += this->get_plt_entry_size(); | |
2e30d253 ILT |
1604 | |
1605 | unsigned char* got_pov = got_view; | |
1606 | ||
7d172687 ILT |
1607 | // The first entry in the GOT is the address of the .dynamic section |
1608 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1609 | // We saved space for them when we created the section in | |
1610 | // Target_x86_64::got_section. | |
1611 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1612 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1613 | elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr); | |
1614 | got_pov += 8; | |
1615 | memset(got_pov, 0, 16); | |
1616 | got_pov += 16; | |
2e30d253 | 1617 | |
2e702c99 | 1618 | unsigned int plt_offset = this->get_plt_entry_size(); |
2e30d253 | 1619 | unsigned int got_offset = 24; |
67181c72 | 1620 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
1621 | for (unsigned int plt_index = 0; |
1622 | plt_index < count; | |
1623 | ++plt_index, | |
2e702c99 | 1624 | pov += this->get_plt_entry_size(), |
2e30d253 | 1625 | got_pov += 8, |
2e702c99 | 1626 | plt_offset += this->get_plt_entry_size(), |
2e30d253 ILT |
1627 | got_offset += 8) |
1628 | { | |
1629 | // Set and adjust the PLT entry itself. | |
2e702c99 RM |
1630 | unsigned int lazy_offset = this->fill_plt_entry(pov, |
1631 | got_address, plt_address, | |
1632 | got_offset, plt_offset, | |
1633 | plt_index); | |
2e30d253 ILT |
1634 | |
1635 | // Set the entry in the GOT. | |
2e702c99 RM |
1636 | elfcpp::Swap<64, false>::writeval(got_pov, |
1637 | plt_address + plt_offset + lazy_offset); | |
2e30d253 ILT |
1638 | } |
1639 | ||
c2b45e22 CC |
1640 | if (this->has_tlsdesc_entry()) |
1641 | { | |
1642 | // Set and adjust the reserved TLSDESC PLT entry. | |
1643 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
2e702c99 RM |
1644 | this->fill_tlsdesc_entry(pov, got_address, plt_address, got_base, |
1645 | tlsdesc_got_offset, plt_offset); | |
1646 | pov += this->get_plt_entry_size(); | |
c2b45e22 CC |
1647 | } |
1648 | ||
fe8718a4 ILT |
1649 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1650 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1651 | |
2ea97941 | 1652 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1653 | of->write_output_view(got_file_offset, got_size, got_view); |
1654 | } | |
1655 | ||
c2b45e22 | 1656 | // Create the PLT section. |
2e30d253 | 1657 | |
fc51264f | 1658 | template<int size> |
2e30d253 | 1659 | void |
fc51264f | 1660 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1661 | { |
2e30d253 ILT |
1662 | if (this->plt_ == NULL) |
1663 | { | |
1664 | // Create the GOT sections first. | |
1665 | this->got_section(symtab, layout); | |
1666 | ||
2e702c99 RM |
1667 | this->plt_ = this->make_data_plt(layout, this->got_, this->got_plt_, |
1668 | this->got_irelative_); | |
1669 | ||
1670 | // Add unwind information if requested. | |
1671 | if (parameters->options().ld_generated_unwind_info()) | |
1672 | this->plt_->add_eh_frame(layout); | |
1673 | ||
2e30d253 ILT |
1674 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1675 | (elfcpp::SHF_ALLOC | |
1676 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1677 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1678 | |
1679 | // Make the sh_info field of .rela.plt point to .plt. | |
1680 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1681 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1682 | } |
c2b45e22 CC |
1683 | } |
1684 | ||
e291e7b9 ILT |
1685 | // Return the section for TLSDESC relocations. |
1686 | ||
fc51264f L |
1687 | template<int size> |
1688 | typename Target_x86_64<size>::Reloc_section* | |
1689 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
1690 | { |
1691 | return this->plt_section()->rela_tlsdesc(layout); | |
1692 | } | |
1693 | ||
c2b45e22 CC |
1694 | // Create a PLT entry for a global symbol. |
1695 | ||
fc51264f | 1696 | template<int size> |
c2b45e22 | 1697 | void |
fc51264f L |
1698 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
1699 | Symbol* gsym) | |
c2b45e22 CC |
1700 | { |
1701 | if (gsym->has_plt_offset()) | |
1702 | return; | |
1703 | ||
1704 | if (this->plt_ == NULL) | |
1705 | this->make_plt_section(symtab, layout); | |
2e30d253 | 1706 | |
67181c72 | 1707 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
1708 | } |
1709 | ||
7223e9ca ILT |
1710 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1711 | ||
fc51264f | 1712 | template<int size> |
7223e9ca | 1713 | void |
fc51264f L |
1714 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
1715 | Symbol_table* symtab, Layout* layout, | |
1716 | Sized_relobj_file<size, false>* relobj, | |
1717 | unsigned int local_sym_index) | |
7223e9ca ILT |
1718 | { |
1719 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1720 | return; | |
1721 | if (this->plt_ == NULL) | |
1722 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1723 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1724 | relobj, | |
7223e9ca ILT |
1725 | local_sym_index); |
1726 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1727 | } | |
1728 | ||
0e70b911 CC |
1729 | // Return the number of entries in the PLT. |
1730 | ||
fc51264f | 1731 | template<int size> |
0e70b911 | 1732 | unsigned int |
fc51264f | 1733 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
1734 | { |
1735 | if (this->plt_ == NULL) | |
1736 | return 0; | |
1737 | return this->plt_->entry_count(); | |
1738 | } | |
1739 | ||
1740 | // Return the offset of the first non-reserved PLT entry. | |
1741 | ||
fc51264f | 1742 | template<int size> |
0e70b911 | 1743 | unsigned int |
fc51264f | 1744 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 1745 | { |
2e702c99 | 1746 | return this->plt_->first_plt_entry_offset(); |
0e70b911 CC |
1747 | } |
1748 | ||
1749 | // Return the size of each PLT entry. | |
1750 | ||
fc51264f | 1751 | template<int size> |
0e70b911 | 1752 | unsigned int |
fc51264f | 1753 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 1754 | { |
2e702c99 | 1755 | return this->plt_->get_plt_entry_size(); |
0e70b911 CC |
1756 | } |
1757 | ||
4829d394 CC |
1758 | // Create the GOT and PLT sections for an incremental update. |
1759 | ||
fc51264f | 1760 | template<int size> |
dd74ae06 | 1761 | Output_data_got_base* |
fc51264f | 1762 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
1763 | Layout* layout, |
1764 | unsigned int got_count, | |
1765 | unsigned int plt_count) | |
1766 | { | |
1767 | gold_assert(this->got_ == NULL); | |
1768 | ||
1769 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
1770 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1771 | (elfcpp::SHF_ALLOC | |
1772 | | elfcpp::SHF_WRITE), | |
1773 | this->got_, ORDER_RELRO_LAST, | |
1774 | true); | |
1775 | ||
1776 | // Add the three reserved entries. | |
1777 | this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT"); | |
1778 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1779 | (elfcpp::SHF_ALLOC | |
1780 | | elfcpp::SHF_WRITE), | |
1781 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
1782 | false); | |
1783 | ||
1784 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1785 | this->global_offset_table_ = | |
1786 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1787 | Symbol_table::PREDEFINED, | |
1788 | this->got_plt_, | |
1789 | 0, 0, elfcpp::STT_OBJECT, | |
1790 | elfcpp::STB_LOCAL, | |
1791 | elfcpp::STV_HIDDEN, 0, | |
1792 | false, false); | |
1793 | ||
1794 | // If there are any TLSDESC relocations, they get GOT entries in | |
1795 | // .got.plt after the jump slot entries. | |
1796 | // FIXME: Get the count for TLSDESC entries. | |
1797 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
1798 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1799 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1800 | this->got_tlsdesc_, | |
1801 | ORDER_NON_RELRO_FIRST, false); | |
1802 | ||
67181c72 ILT |
1803 | // If there are any IRELATIVE relocations, they get GOT entries in |
1804 | // .got.plt after the jump slot and TLSDESC entries. | |
1805 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
1806 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1807 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1808 | this->got_irelative_, | |
1809 | ORDER_NON_RELRO_FIRST, false); | |
1810 | ||
4829d394 | 1811 | // Create the PLT section. |
2e702c99 RM |
1812 | this->plt_ = this->make_data_plt(layout, this->got_, |
1813 | this->got_plt_, | |
1814 | this->got_irelative_, | |
1815 | plt_count); | |
1816 | ||
1817 | // Add unwind information if requested. | |
1818 | if (parameters->options().ld_generated_unwind_info()) | |
1819 | this->plt_->add_eh_frame(layout); | |
1820 | ||
4829d394 CC |
1821 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1822 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
1823 | this->plt_, ORDER_PLT, false); | |
1824 | ||
1825 | // Make the sh_info field of .rela.plt point to .plt. | |
1826 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1827 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
1828 | ||
6fa2a40b CC |
1829 | // Create the rela_dyn section. |
1830 | this->rela_dyn_section(layout); | |
1831 | ||
4829d394 CC |
1832 | return this->got_; |
1833 | } | |
1834 | ||
6fa2a40b CC |
1835 | // Reserve a GOT entry for a local symbol, and regenerate any |
1836 | // necessary dynamic relocations. | |
1837 | ||
fc51264f | 1838 | template<int size> |
6fa2a40b | 1839 | void |
fc51264f | 1840 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 1841 | unsigned int got_index, |
fc51264f | 1842 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
1843 | unsigned int r_sym, |
1844 | unsigned int got_type) | |
1845 | { | |
1846 | unsigned int got_offset = got_index * 8; | |
1847 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1848 | ||
1849 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
1850 | switch (got_type) | |
1851 | { | |
1852 | case GOT_TYPE_STANDARD: | |
1853 | if (parameters->options().output_is_position_independent()) | |
1854 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 1855 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1856 | break; |
1857 | case GOT_TYPE_TLS_OFFSET: | |
1858 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
1859 | this->got_, got_offset, 0); | |
1860 | break; | |
1861 | case GOT_TYPE_TLS_PAIR: | |
1862 | this->got_->reserve_slot(got_index + 1); | |
1863 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
1864 | this->got_, got_offset, 0); | |
1865 | break; | |
1866 | case GOT_TYPE_TLS_DESC: | |
1867 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
1868 | // this->got_->reserve_slot(got_index + 1); | |
1869 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1870 | // this->got_, got_offset, 0); | |
1871 | break; | |
1872 | default: | |
1873 | gold_unreachable(); | |
1874 | } | |
1875 | } | |
1876 | ||
1877 | // Reserve a GOT entry for a global symbol, and regenerate any | |
1878 | // necessary dynamic relocations. | |
1879 | ||
fc51264f | 1880 | template<int size> |
6fa2a40b | 1881 | void |
fc51264f L |
1882 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
1883 | Symbol* gsym, | |
1884 | unsigned int got_type) | |
6fa2a40b CC |
1885 | { |
1886 | unsigned int got_offset = got_index * 8; | |
1887 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1888 | ||
1889 | this->got_->reserve_global(got_index, gsym, got_type); | |
1890 | switch (got_type) | |
1891 | { | |
1892 | case GOT_TYPE_STANDARD: | |
1893 | if (!gsym->final_value_is_known()) | |
1894 | { | |
1895 | if (gsym->is_from_dynobj() | |
1896 | || gsym->is_undefined() | |
1897 | || gsym->is_preemptible() | |
1898 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1899 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
1900 | this->got_, got_offset, 0); | |
1901 | else | |
1902 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 1903 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1904 | } |
1905 | break; | |
1906 | case GOT_TYPE_TLS_OFFSET: | |
1907 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
13cf9988 | 1908 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1909 | break; |
1910 | case GOT_TYPE_TLS_PAIR: | |
1911 | this->got_->reserve_slot(got_index + 1); | |
1912 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
13cf9988 | 1913 | this->got_, got_offset, 0, false); |
6fa2a40b | 1914 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, |
13cf9988 | 1915 | this->got_, got_offset + 8, 0, false); |
6fa2a40b CC |
1916 | break; |
1917 | case GOT_TYPE_TLS_DESC: | |
1918 | this->got_->reserve_slot(got_index + 1); | |
1919 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
13cf9988 | 1920 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1921 | break; |
1922 | default: | |
1923 | gold_unreachable(); | |
1924 | } | |
1925 | } | |
1926 | ||
4829d394 CC |
1927 | // Register an existing PLT entry for a global symbol. |
1928 | ||
fc51264f | 1929 | template<int size> |
4829d394 | 1930 | void |
fc51264f L |
1931 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
1932 | Layout* layout, | |
1933 | unsigned int plt_index, | |
1934 | Symbol* gsym) | |
4829d394 CC |
1935 | { |
1936 | gold_assert(this->plt_ != NULL); | |
1937 | gold_assert(!gsym->has_plt_offset()); | |
1938 | ||
1939 | this->plt_->reserve_slot(plt_index); | |
1940 | ||
1941 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
1942 | ||
1943 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 1944 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
1945 | } |
1946 | ||
26d3c67d CC |
1947 | // Force a COPY relocation for a given symbol. |
1948 | ||
fc51264f | 1949 | template<int size> |
26d3c67d | 1950 | void |
fc51264f | 1951 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
1952 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
1953 | { | |
1954 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 1955 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
1956 | os, |
1957 | offset, | |
1958 | this->rela_dyn_section(NULL)); | |
1959 | } | |
1960 | ||
9fa33bee | 1961 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 1962 | |
fc51264f | 1963 | template<int size> |
edfbb029 | 1964 | void |
fc51264f L |
1965 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
1966 | Layout* layout) | |
edfbb029 CC |
1967 | { |
1968 | if (this->tls_base_symbol_defined_) | |
1969 | return; | |
1970 | ||
1971 | Output_segment* tls_segment = layout->tls_segment(); | |
1972 | if (tls_segment != NULL) | |
1973 | { | |
183fd0e3 | 1974 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1975 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1976 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1977 | tls_segment, 0, 0, |
1978 | elfcpp::STT_TLS, | |
1979 | elfcpp::STB_LOCAL, | |
1980 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1981 | (is_exec |
1982 | ? Symbol::SEGMENT_END | |
1983 | : Symbol::SEGMENT_START), | |
1984 | true); | |
edfbb029 CC |
1985 | } |
1986 | this->tls_base_symbol_defined_ = true; | |
1987 | } | |
1988 | ||
c2b45e22 CC |
1989 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1990 | ||
fc51264f | 1991 | template<int size> |
c2b45e22 | 1992 | void |
fc51264f | 1993 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
2e702c99 | 1994 | Layout* layout) |
c2b45e22 CC |
1995 | { |
1996 | if (this->plt_ == NULL) | |
1997 | this->make_plt_section(symtab, layout); | |
1998 | ||
1999 | if (!this->plt_->has_tlsdesc_entry()) | |
2000 | { | |
2001 | // Allocate the TLSDESC_GOT entry. | |
2002 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2003 | unsigned int got_offset = got->add_constant(0); | |
2004 | ||
2005 | // Allocate the TLSDESC_PLT entry. | |
2006 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
2007 | } | |
2008 | } | |
2009 | ||
31d60480 ILT |
2010 | // Create a GOT entry for the TLS module index. |
2011 | ||
fc51264f | 2012 | template<int size> |
31d60480 | 2013 | unsigned int |
fc51264f L |
2014 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
2015 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
2016 | { |
2017 | if (this->got_mod_index_offset_ == -1U) | |
2018 | { | |
2019 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
2020 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
2021 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
2022 | unsigned int got_offset = got->add_constant(0); | |
2023 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
2e702c99 | 2024 | got_offset, 0); |
009a67a2 | 2025 | got->add_constant(0); |
31d60480 ILT |
2026 | this->got_mod_index_offset_ = got_offset; |
2027 | } | |
2028 | return this->got_mod_index_offset_; | |
2029 | } | |
2030 | ||
2e30d253 ILT |
2031 | // Optimize the TLS relocation type based on what we know about the |
2032 | // symbol. IS_FINAL is true if the final address of this symbol is | |
2033 | // known at link time. | |
2034 | ||
fc51264f | 2035 | template<int size> |
e041f13d | 2036 | tls::Tls_optimization |
fc51264f | 2037 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 2038 | { |
2e30d253 ILT |
2039 | // If we are generating a shared library, then we can't do anything |
2040 | // in the linker. | |
8851ecca | 2041 | if (parameters->options().shared()) |
e041f13d | 2042 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2043 | |
2044 | switch (r_type) | |
2045 | { | |
2046 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
2047 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2048 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2049 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
2050 | // access. Since we know that we are generating an executable, |
2051 | // we can convert this to Initial-Exec. If we also know that | |
2052 | // this is a local symbol, we can further switch to Local-Exec. | |
2053 | if (is_final) | |
e041f13d ILT |
2054 | return tls::TLSOPT_TO_LE; |
2055 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 2056 | |
d61c17ea | 2057 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
2058 | // This is Local-Dynamic, which refers to a local symbol in the |
2059 | // dynamic TLS block. Since we know that we generating an | |
2060 | // executable, we can switch to Local-Exec. | |
e041f13d | 2061 | return tls::TLSOPT_TO_LE; |
2e30d253 | 2062 | |
0ffd9845 | 2063 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
2064 | case elfcpp::R_X86_64_DTPOFF64: |
2065 | // Another Local-Dynamic reloc. | |
e041f13d | 2066 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 2067 | |
d61c17ea | 2068 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
2069 | // These are Initial-Exec relocs which get the thread offset |
2070 | // from the GOT. If we know that we are linking against the | |
2071 | // local symbol, we can switch to Local-Exec, which links the | |
2072 | // thread offset into the instruction. | |
2073 | if (is_final) | |
e041f13d ILT |
2074 | return tls::TLSOPT_TO_LE; |
2075 | return tls::TLSOPT_NONE; | |
2e30d253 | 2076 | |
d61c17ea | 2077 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
2078 | // When we already have Local-Exec, there is nothing further we |
2079 | // can do. | |
e041f13d | 2080 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
2081 | |
2082 | default: | |
2083 | gold_unreachable(); | |
2084 | } | |
2e30d253 ILT |
2085 | } |
2086 | ||
95a2c8d6 RS |
2087 | // Get the Reference_flags for a particular relocation. |
2088 | ||
fc51264f | 2089 | template<int size> |
95a2c8d6 | 2090 | int |
fc51264f | 2091 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
2092 | { |
2093 | switch (r_type) | |
2094 | { | |
2095 | case elfcpp::R_X86_64_NONE: | |
2096 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
2097 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2098 | case elfcpp::R_X86_64_GOTPC32: | |
2099 | case elfcpp::R_X86_64_GOTPC64: | |
2100 | // No symbol reference. | |
2101 | return 0; | |
2102 | ||
2103 | case elfcpp::R_X86_64_64: | |
2104 | case elfcpp::R_X86_64_32: | |
2105 | case elfcpp::R_X86_64_32S: | |
2106 | case elfcpp::R_X86_64_16: | |
2107 | case elfcpp::R_X86_64_8: | |
2108 | return Symbol::ABSOLUTE_REF; | |
2109 | ||
2110 | case elfcpp::R_X86_64_PC64: | |
2111 | case elfcpp::R_X86_64_PC32: | |
2112 | case elfcpp::R_X86_64_PC16: | |
2113 | case elfcpp::R_X86_64_PC8: | |
2114 | case elfcpp::R_X86_64_GOTOFF64: | |
2115 | return Symbol::RELATIVE_REF; | |
2116 | ||
2117 | case elfcpp::R_X86_64_PLT32: | |
2118 | case elfcpp::R_X86_64_PLTOFF64: | |
2119 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
2120 | ||
2121 | case elfcpp::R_X86_64_GOT64: | |
2122 | case elfcpp::R_X86_64_GOT32: | |
2123 | case elfcpp::R_X86_64_GOTPCREL64: | |
2124 | case elfcpp::R_X86_64_GOTPCREL: | |
2125 | case elfcpp::R_X86_64_GOTPLT64: | |
2126 | // Absolute in GOT. | |
2127 | return Symbol::ABSOLUTE_REF; | |
2128 | ||
2129 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
2130 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
2131 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
2132 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
2133 | case elfcpp::R_X86_64_DTPOFF32: | |
2134 | case elfcpp::R_X86_64_DTPOFF64: | |
2135 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
2136 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2137 | return Symbol::TLS_REF; | |
2138 | ||
2139 | case elfcpp::R_X86_64_COPY: | |
2140 | case elfcpp::R_X86_64_GLOB_DAT: | |
2141 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2142 | case elfcpp::R_X86_64_RELATIVE: | |
2143 | case elfcpp::R_X86_64_IRELATIVE: | |
2144 | case elfcpp::R_X86_64_TPOFF64: | |
2145 | case elfcpp::R_X86_64_DTPMOD64: | |
2146 | case elfcpp::R_X86_64_TLSDESC: | |
2147 | case elfcpp::R_X86_64_SIZE32: | |
2148 | case elfcpp::R_X86_64_SIZE64: | |
2149 | default: | |
2150 | // Not expected. We will give an error later. | |
2151 | return 0; | |
2152 | } | |
2153 | } | |
2154 | ||
e041f13d ILT |
2155 | // Report an unsupported relocation against a local symbol. |
2156 | ||
fc51264f | 2157 | template<int size> |
e041f13d | 2158 | void |
fc51264f L |
2159 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
2160 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2161 | unsigned int r_type) |
e041f13d | 2162 | { |
75f2446e ILT |
2163 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2164 | object->name().c_str(), r_type); | |
e041f13d ILT |
2165 | } |
2166 | ||
a036edd8 ILT |
2167 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
2168 | // dynamic linker does not support it, issue an error. The GNU linker | |
2169 | // only issues a non-PIC error for an allocated read-only section. | |
2170 | // Here we know the section is allocated, but we don't know that it is | |
2171 | // read-only. But we check for all the relocation types which the | |
2172 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
2173 | // error even if the section is not read-only. If GSYM is not NULL, |
2174 | // it is the symbol the relocation is against; if it is NULL, the | |
2175 | // relocation is against a local symbol. | |
a036edd8 | 2176 | |
fc51264f | 2177 | template<int size> |
a036edd8 | 2178 | void |
fc51264f L |
2179 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
2180 | Symbol* gsym) | |
a036edd8 ILT |
2181 | { |
2182 | switch (r_type) | |
2183 | { | |
2fbb4320 ILT |
2184 | // These are the relocation types supported by glibc for x86_64 |
2185 | // which should always work. | |
a036edd8 | 2186 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 2187 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
2188 | case elfcpp::R_X86_64_GLOB_DAT: |
2189 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2190 | case elfcpp::R_X86_64_DTPMOD64: | |
2191 | case elfcpp::R_X86_64_DTPOFF64: | |
2192 | case elfcpp::R_X86_64_TPOFF64: | |
2193 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
2194 | case elfcpp::R_X86_64_COPY: |
2195 | return; | |
2196 | ||
2197 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 2198 | case elfcpp::R_X86_64_PC32: |
a29b0dad ILT |
2199 | // A PC relative reference is OK against a local symbol or if |
2200 | // the symbol is defined locally. | |
2201 | if (gsym == NULL | |
2202 | || (!gsym->is_from_dynobj() | |
2203 | && !gsym->is_undefined() | |
2204 | && !gsym->is_preemptible())) | |
2205 | return; | |
2206 | /* Fall through. */ | |
2207 | case elfcpp::R_X86_64_32: | |
3660ff06 L |
2208 | // R_X86_64_32 is OK for x32. |
2209 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2210 | return; | |
2fbb4320 ILT |
2211 | if (this->issued_non_pic_error_) |
2212 | return; | |
2213 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
2214 | if (gsym == NULL) |
2215 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
2216 | "overflow at runtime; recompile with -fPIC")); | |
2217 | else | |
2218 | object->error(_("requires dynamic %s reloc against '%s' which may " | |
2219 | "overflow at runtime; recompile with -fPIC"), | |
2220 | (r_type == elfcpp::R_X86_64_32 | |
2221 | ? "R_X86_64_32" | |
2222 | : "R_X86_64_PC32"), | |
2223 | gsym->name()); | |
2fbb4320 | 2224 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
2225 | return; |
2226 | ||
2227 | default: | |
2228 | // This prevents us from issuing more than one error per reloc | |
2229 | // section. But we can still wind up issuing more than one | |
2230 | // error per object file. | |
2231 | if (this->issued_non_pic_error_) | |
2e702c99 | 2232 | return; |
33aea2fd | 2233 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad | 2234 | object->error(_("requires unsupported dynamic reloc %u; " |
2e702c99 | 2235 | "recompile with -fPIC"), |
a29b0dad | 2236 | r_type); |
a036edd8 ILT |
2237 | this->issued_non_pic_error_ = true; |
2238 | return; | |
2239 | ||
2240 | case elfcpp::R_X86_64_NONE: | |
2241 | gold_unreachable(); | |
2242 | } | |
2243 | } | |
2244 | ||
7223e9ca ILT |
2245 | // Return whether we need to make a PLT entry for a relocation of the |
2246 | // given type against a STT_GNU_IFUNC symbol. | |
2247 | ||
fc51264f | 2248 | template<int size> |
7223e9ca | 2249 | bool |
fc51264f L |
2250 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
2251 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2252 | unsigned int r_type) |
7223e9ca | 2253 | { |
95a2c8d6 RS |
2254 | int flags = Scan::get_reference_flags(r_type); |
2255 | if (flags & Symbol::TLS_REF) | |
2256 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2e702c99 | 2257 | object->name().c_str(), r_type); |
95a2c8d6 | 2258 | return flags != 0; |
7223e9ca ILT |
2259 | } |
2260 | ||
2e30d253 ILT |
2261 | // Scan a relocation for a local symbol. |
2262 | ||
fc51264f | 2263 | template<int size> |
2e30d253 | 2264 | inline void |
fc51264f L |
2265 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
2266 | Layout* layout, | |
2267 | Target_x86_64<size>* target, | |
2268 | Sized_relobj_file<size, false>* object, | |
2269 | unsigned int data_shndx, | |
2270 | Output_section* output_section, | |
2271 | const elfcpp::Rela<size, false>& reloc, | |
2272 | unsigned int r_type, | |
2273 | const elfcpp::Sym<size, false>& lsym) | |
2e30d253 | 2274 | { |
7223e9ca | 2275 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
2276 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
2277 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 2278 | { |
fc51264f | 2279 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2280 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
2281 | } | |
2282 | ||
2e30d253 ILT |
2283 | switch (r_type) |
2284 | { | |
2285 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2286 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2287 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2288 | break; |
2289 | ||
2290 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 2291 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2292 | // executable), we need to create a dynamic relocation for this |
2293 | // location. The relocation applied at link time will apply the | |
2294 | // link-time value, so we flag the location with an | |
2295 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 2296 | // relocate it easily. |
8851ecca | 2297 | if (parameters->options().output_is_position_independent()) |
2e702c99 RM |
2298 | { |
2299 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2300 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2301 | rela_dyn->add_local_relative(object, r_sym, |
2302 | elfcpp::R_X86_64_RELATIVE, | |
2303 | output_section, data_shndx, | |
2304 | reloc.get_r_offset(), | |
397b129b | 2305 | reloc.get_r_addend(), is_ifunc); |
2e702c99 | 2306 | } |
d61c6bd4 ILT |
2307 | break; |
2308 | ||
2e30d253 ILT |
2309 | case elfcpp::R_X86_64_32: |
2310 | case elfcpp::R_X86_64_32S: | |
2311 | case elfcpp::R_X86_64_16: | |
2312 | case elfcpp::R_X86_64_8: | |
96f2030e | 2313 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2314 | // executable), we need to create a dynamic relocation for this |
2315 | // location. We can't use an R_X86_64_RELATIVE relocation | |
2316 | // because that is always a 64-bit relocation. | |
8851ecca | 2317 | if (parameters->options().output_is_position_independent()) |
2e702c99 | 2318 | { |
3660ff06 L |
2319 | // Use R_X86_64_RELATIVE relocation for R_X86_64_32 under x32. |
2320 | if (size == 32 && r_type == elfcpp::R_X86_64_32) | |
2321 | { | |
2322 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2323 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2324 | rela_dyn->add_local_relative(object, r_sym, | |
2325 | elfcpp::R_X86_64_RELATIVE, | |
2326 | output_section, data_shndx, | |
2327 | reloc.get_r_offset(), | |
2328 | reloc.get_r_addend(), is_ifunc); | |
2329 | break; | |
2330 | } | |
2331 | ||
2e702c99 | 2332 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 2333 | |
2e702c99 | 2334 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 2335 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
2e702c99 | 2336 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
2337 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
2338 | data_shndx, reloc.get_r_offset(), | |
2339 | reloc.get_r_addend()); | |
2e702c99 RM |
2340 | else |
2341 | { | |
2342 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
2343 | unsigned int shndx = lsym.get_st_shndx(); |
2344 | bool is_ordinary; | |
2345 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
2346 | &is_ordinary); | |
2347 | if (!is_ordinary) | |
2348 | object->error(_("section symbol %u has bad shndx %u"), | |
2349 | r_sym, shndx); | |
2350 | else | |
2351 | rela_dyn->add_local_section(object, shndx, | |
2352 | r_type, output_section, | |
2353 | data_shndx, reloc.get_r_offset(), | |
2354 | reloc.get_r_addend()); | |
2e702c99 RM |
2355 | } |
2356 | } | |
2e30d253 ILT |
2357 | break; |
2358 | ||
2359 | case elfcpp::R_X86_64_PC64: | |
2360 | case elfcpp::R_X86_64_PC32: | |
2361 | case elfcpp::R_X86_64_PC16: | |
2362 | case elfcpp::R_X86_64_PC8: | |
2363 | break; | |
2364 | ||
f389a824 ILT |
2365 | case elfcpp::R_X86_64_PLT32: |
2366 | // Since we know this is a local symbol, we can handle this as a | |
2367 | // PC32 reloc. | |
2368 | break; | |
2369 | ||
fdc2f80f | 2370 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2371 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2372 | case elfcpp::R_X86_64_GOTPC64: |
2373 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2374 | // We need a GOT section. |
2375 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2376 | // For PLTOFF64, we'd normally want a PLT section, but since we |
2377 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
2378 | break; |
2379 | ||
0ffd9845 ILT |
2380 | case elfcpp::R_X86_64_GOT64: |
2381 | case elfcpp::R_X86_64_GOT32: | |
2382 | case elfcpp::R_X86_64_GOTPCREL64: | |
2383 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 2384 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 2385 | { |
2e702c99 RM |
2386 | // The symbol requires a GOT entry. |
2387 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
2388 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
7223e9ca ILT |
2389 | |
2390 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
2391 | // lets function pointers compare correctly with shared | |
2392 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
2393 | bool is_new; | |
397b129b | 2394 | if (is_ifunc) |
7223e9ca ILT |
2395 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
2396 | else | |
2397 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2e702c99 RM |
2398 | if (is_new) |
2399 | { | |
2400 | // If we are generating a shared object, we need to add a | |
2401 | // dynamic relocation for this symbol's GOT entry. | |
2402 | if (parameters->options().output_is_position_independent()) | |
2403 | { | |
2404 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
2405 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
2406 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
2407 | { |
2408 | unsigned int got_offset = | |
2409 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
2410 | rela_dyn->add_local_relative(object, r_sym, | |
2411 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2412 | got, got_offset, 0, is_ifunc); |
7223e9ca | 2413 | } |
2e702c99 RM |
2414 | else |
2415 | { | |
2416 | this->check_non_pic(object, r_type, NULL); | |
2417 | ||
2418 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); | |
2419 | rela_dyn->add_local( | |
2420 | object, r_sym, r_type, got, | |
2421 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
2422 | } | |
2423 | } | |
2424 | } | |
2425 | // For GOTPLT64, we'd normally want a PLT section, but since | |
2426 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
2427 | } |
2428 | break; | |
2429 | ||
2e30d253 ILT |
2430 | case elfcpp::R_X86_64_COPY: |
2431 | case elfcpp::R_X86_64_GLOB_DAT: | |
2432 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2433 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2434 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2435 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2436 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2437 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2438 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2439 | gold_error(_("%s: unexpected reloc %u in object file"), |
2440 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2441 | break; |
2442 | ||
d61c17ea | 2443 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2444 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2445 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2446 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2447 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2448 | case elfcpp::R_X86_64_DTPOFF32: |
2449 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2450 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2451 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 2452 | { |
8851ecca | 2453 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 2454 | const tls::Tls_optimization optimized_type |
2e702c99 | 2455 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
fc51264f | 2456 | r_type); |
2e30d253 ILT |
2457 | switch (r_type) |
2458 | { | |
2e702c99 RM |
2459 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
2460 | if (optimized_type == tls::TLSOPT_NONE) | |
2461 | { | |
2462 | // Create a pair of GOT entries for the module index and | |
2463 | // dtv-relative offset. | |
2464 | Output_data_got<64, false>* got | |
2465 | = target->got_section(symtab, layout); | |
2466 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
d491d34e ILT |
2467 | unsigned int shndx = lsym.get_st_shndx(); |
2468 | bool is_ordinary; | |
2469 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
2470 | if (!is_ordinary) | |
2471 | object->error(_("local symbol %u has bad shndx %u"), | |
2472 | r_sym, shndx); | |
2e702c99 | 2473 | else |
83896202 ILT |
2474 | got->add_local_pair_with_rel(object, r_sym, |
2475 | shndx, | |
2476 | GOT_TYPE_TLS_PAIR, | |
2477 | target->rela_dyn_section(layout), | |
2478 | elfcpp::R_X86_64_DTPMOD64, 0); | |
2e702c99 RM |
2479 | } |
2480 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
7bf1f802 | 2481 | unsupported_reloc_local(object, r_type); |
2e702c99 | 2482 | break; |
7bf1f802 | 2483 | |
2e702c99 RM |
2484 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2485 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
2486 | if (optimized_type == tls::TLSOPT_NONE) |
2487 | { | |
2e702c99 RM |
2488 | // Create reserved PLT and GOT entries for the resolver. |
2489 | target->reserve_tlsdesc_entries(symtab, layout); | |
2490 | ||
2491 | // Generate a double GOT entry with an | |
2492 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
2493 | // is resolved lazily, so the GOT entry needs to be in | |
2494 | // an area in .got.plt, not .got. Call got_section to | |
2495 | // make sure the section has been created. | |
a8df5856 | 2496 | target->got_section(symtab, layout); |
2e702c99 RM |
2497 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
2498 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
e291e7b9 ILT |
2499 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
2500 | { | |
2501 | unsigned int got_offset = got->add_constant(0); | |
2502 | got->add_constant(0); | |
2503 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
2504 | got_offset); | |
2505 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
2506 | // We store the arguments we need in a vector, and | |
2507 | // use the index into the vector as the parameter | |
2508 | // to pass to the target specific routines. | |
2509 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
2510 | void* arg = reinterpret_cast<void*>(intarg); | |
2511 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2512 | got, got_offset, 0); | |
2513 | } | |
c2b45e22 CC |
2514 | } |
2515 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2516 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
2517 | break; |
2518 | ||
2e702c99 | 2519 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
2520 | break; |
2521 | ||
2e702c99 | 2522 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2523 | if (optimized_type == tls::TLSOPT_NONE) |
2524 | { | |
2e702c99 RM |
2525 | // Create a GOT entry for the module index. |
2526 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
2527 | } |
2528 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2529 | unsupported_reloc_local(object, r_type); | |
2530 | break; | |
2531 | ||
2e702c99 RM |
2532 | case elfcpp::R_X86_64_DTPOFF32: |
2533 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2534 | break; |
2535 | ||
2e702c99 | 2536 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2537 | layout->set_has_static_tls(); |
2e702c99 RM |
2538 | if (optimized_type == tls::TLSOPT_NONE) |
2539 | { | |
2540 | // Create a GOT entry for the tp-relative offset. | |
2541 | Output_data_got<64, false>* got | |
2542 | = target->got_section(symtab, layout); | |
2543 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); | |
2544 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2545 | target->rela_dyn_section(layout), |
2546 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
2547 | } |
2548 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2549 | unsupported_reloc_local(object, r_type); | |
2550 | break; | |
0ffd9845 | 2551 | |
2e702c99 | 2552 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2553 | layout->set_has_static_tls(); |
2e702c99 RM |
2554 | if (output_is_shared) |
2555 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 2556 | break; |
e041f13d | 2557 | |
2e702c99 RM |
2558 | default: |
2559 | gold_unreachable(); | |
2e30d253 ILT |
2560 | } |
2561 | } | |
2562 | break; | |
2e30d253 | 2563 | |
fdc2f80f ILT |
2564 | case elfcpp::R_X86_64_SIZE32: |
2565 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2566 | default: |
75f2446e ILT |
2567 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2568 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2569 | break; |
2570 | } | |
2571 | } | |
2572 | ||
2573 | ||
e041f13d ILT |
2574 | // Report an unsupported relocation against a global symbol. |
2575 | ||
fc51264f | 2576 | template<int size> |
e041f13d | 2577 | void |
fc51264f L |
2578 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
2579 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
2580 | unsigned int r_type, |
2581 | Symbol* gsym) | |
e041f13d | 2582 | { |
75f2446e | 2583 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2584 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
2585 | } |
2586 | ||
ce97fa81 | 2587 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 2588 | template<int size> |
21bb3914 | 2589 | inline bool |
fc51264f | 2590 | Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type) |
21bb3914 | 2591 | { |
21bb3914 ST |
2592 | switch (r_type) |
2593 | { | |
2594 | case elfcpp::R_X86_64_64: | |
2595 | case elfcpp::R_X86_64_32: | |
2596 | case elfcpp::R_X86_64_32S: | |
2597 | case elfcpp::R_X86_64_16: | |
2598 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
2599 | case elfcpp::R_X86_64_GOT64: |
2600 | case elfcpp::R_X86_64_GOT32: | |
2601 | case elfcpp::R_X86_64_GOTPCREL64: | |
2602 | case elfcpp::R_X86_64_GOTPCREL: | |
2603 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 | 2604 | { |
2e702c99 | 2605 | return true; |
21bb3914 ST |
2606 | } |
2607 | } | |
2608 | return false; | |
2609 | } | |
2610 | ||
2611 | // For safe ICF, scan a relocation for a local symbol to check if it | |
2612 | // corresponds to a function pointer being taken. In that case mark | |
2613 | // the function whose pointer was taken as not foldable. | |
2614 | ||
fc51264f | 2615 | template<int size> |
21bb3914 | 2616 | inline bool |
fc51264f | 2617 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
2618 | Symbol_table* , |
2619 | Layout* , | |
fc51264f L |
2620 | Target_x86_64<size>* , |
2621 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2622 | unsigned int , |
2623 | Output_section* , | |
fc51264f | 2624 | const elfcpp::Rela<size, false>& , |
21bb3914 | 2625 | unsigned int r_type, |
fc51264f | 2626 | const elfcpp::Sym<size, false>&) |
21bb3914 ST |
2627 | { |
2628 | // When building a shared library, do not fold any local symbols as it is | |
2629 | // not possible to distinguish pointer taken versus a call by looking at | |
2630 | // the relocation types. | |
2631 | return (parameters->options().shared() | |
2e702c99 | 2632 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2633 | } |
2634 | ||
2635 | // For safe ICF, scan a relocation for a global symbol to check if it | |
2636 | // corresponds to a function pointer being taken. In that case mark | |
2637 | // the function whose pointer was taken as not foldable. | |
2638 | ||
fc51264f | 2639 | template<int size> |
21bb3914 | 2640 | inline bool |
fc51264f | 2641 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
2642 | Symbol_table*, |
2643 | Layout* , | |
fc51264f L |
2644 | Target_x86_64<size>* , |
2645 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2646 | unsigned int , |
2647 | Output_section* , | |
fc51264f | 2648 | const elfcpp::Rela<size, false>& , |
21bb3914 ST |
2649 | unsigned int r_type, |
2650 | Symbol* gsym) | |
2651 | { | |
2652 | // When building a shared library, do not fold symbols whose visibility | |
2653 | // is hidden, internal or protected. | |
2654 | return ((parameters->options().shared() | |
2e702c99 | 2655 | && (gsym->visibility() == elfcpp::STV_INTERNAL |
21bb3914 ST |
2656 | || gsym->visibility() == elfcpp::STV_PROTECTED |
2657 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
2e702c99 | 2658 | || possible_function_pointer_reloc(r_type)); |
21bb3914 ST |
2659 | } |
2660 | ||
2e30d253 ILT |
2661 | // Scan a relocation for a global symbol. |
2662 | ||
fc51264f | 2663 | template<int size> |
2e30d253 | 2664 | inline void |
fc51264f | 2665 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
2e702c99 RM |
2666 | Layout* layout, |
2667 | Target_x86_64<size>* target, | |
2668 | Sized_relobj_file<size, false>* object, | |
2669 | unsigned int data_shndx, | |
2670 | Output_section* output_section, | |
2671 | const elfcpp::Rela<size, false>& reloc, | |
2672 | unsigned int r_type, | |
2673 | Symbol* gsym) | |
2e30d253 | 2674 | { |
7223e9ca ILT |
2675 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2676 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2677 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2678 | target->make_plt_entry(symtab, layout, gsym); | |
2679 | ||
2e30d253 ILT |
2680 | switch (r_type) |
2681 | { | |
2682 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2683 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2684 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2685 | break; |
2686 | ||
2687 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
2688 | case elfcpp::R_X86_64_32: |
2689 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 2690 | case elfcpp::R_X86_64_16: |
2e30d253 | 2691 | case elfcpp::R_X86_64_8: |
96f2030e | 2692 | { |
2e702c99 RM |
2693 | // Make a PLT entry if necessary. |
2694 | if (gsym->needs_plt_entry()) | |
2695 | { | |
2696 | target->make_plt_entry(symtab, layout, gsym); | |
2697 | // Since this is not a PC-relative relocation, we may be | |
2698 | // taking the address of a function. In that case we need to | |
2699 | // set the entry in the dynamic symbol table to the address of | |
2700 | // the PLT entry. | |
2701 | if (gsym->is_from_dynobj() && !parameters->options().shared()) | |
2702 | gsym->set_needs_dynsym_value(); | |
2703 | } | |
2704 | // Make a dynamic relocation if necessary. | |
2705 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2706 | { | |
2707 | if (gsym->may_need_copy_reloc()) | |
2708 | { | |
2709 | target->copy_reloc(symtab, layout, object, | |
2710 | data_shndx, output_section, gsym, reloc); | |
2711 | } | |
1bae613c L |
2712 | else if (((size == 64 && r_type == elfcpp::R_X86_64_64) |
2713 | || (size == 32 && r_type == elfcpp::R_X86_64_32)) | |
7223e9ca ILT |
2714 | && gsym->type() == elfcpp::STT_GNU_IFUNC |
2715 | && gsym->can_use_relative_reloc(false) | |
2716 | && !gsym->is_from_dynobj() | |
2717 | && !gsym->is_undefined() | |
2718 | && !gsym->is_preemptible()) | |
2719 | { | |
2720 | // Use an IRELATIVE reloc for a locally defined | |
2721 | // STT_GNU_IFUNC symbol. This makes a function | |
2722 | // address in a PIE executable match the address in a | |
2723 | // shared library that it links against. | |
67181c72 ILT |
2724 | Reloc_section* rela_dyn = |
2725 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
2726 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
2727 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
2728 | output_section, object, | |
2729 | data_shndx, | |
2730 | reloc.get_r_offset(), | |
2731 | reloc.get_r_addend()); | |
2732 | } | |
2e702c99 RM |
2733 | else if (r_type == elfcpp::R_X86_64_64 |
2734 | && gsym->can_use_relative_reloc(false)) | |
2735 | { | |
2736 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2737 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
2738 | output_section, object, | |
2739 | data_shndx, | |
2740 | reloc.get_r_offset(), | |
13cf9988 | 2741 | reloc.get_r_addend(), false); |
2e702c99 RM |
2742 | } |
2743 | else | |
2744 | { | |
2745 | this->check_non_pic(object, r_type, gsym); | |
2746 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2747 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2748 | data_shndx, reloc.get_r_offset(), | |
2749 | reloc.get_r_addend()); | |
2750 | } | |
2751 | } | |
d61c6bd4 ILT |
2752 | } |
2753 | break; | |
2754 | ||
2755 | case elfcpp::R_X86_64_PC64: | |
2756 | case elfcpp::R_X86_64_PC32: | |
2757 | case elfcpp::R_X86_64_PC16: | |
2758 | case elfcpp::R_X86_64_PC8: | |
2759 | { | |
2e702c99 RM |
2760 | // Make a PLT entry if necessary. |
2761 | if (gsym->needs_plt_entry()) | |
2762 | target->make_plt_entry(symtab, layout, gsym); | |
2763 | // Make a dynamic relocation if necessary. | |
2764 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) | |
2765 | { | |
2766 | if (gsym->may_need_copy_reloc()) | |
2767 | { | |
2768 | target->copy_reloc(symtab, layout, object, | |
2769 | data_shndx, output_section, gsym, reloc); | |
2770 | } | |
2771 | else | |
2772 | { | |
2773 | this->check_non_pic(object, r_type, gsym); | |
2774 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
2775 | rela_dyn->add_global(gsym, r_type, output_section, object, | |
2776 | data_shndx, reloc.get_r_offset(), | |
2777 | reloc.get_r_addend()); | |
2778 | } | |
2779 | } | |
d61c6bd4 | 2780 | } |
2e30d253 ILT |
2781 | break; |
2782 | ||
ff006520 | 2783 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 2784 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
2785 | case elfcpp::R_X86_64_GOTPCREL64: |
2786 | case elfcpp::R_X86_64_GOTPCREL: | |
2787 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 | 2788 | { |
2e702c99 RM |
2789 | // The symbol requires a GOT entry. |
2790 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
2791 | if (gsym->final_value_is_known()) | |
7223e9ca ILT |
2792 | { |
2793 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2794 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2795 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2796 | else | |
2797 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2798 | } | |
2e702c99 RM |
2799 | else |
2800 | { | |
2801 | // If this symbol is not fully resolved, we need to add a | |
2802 | // dynamic relocation for it. | |
2803 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
07aa62f2 ILT |
2804 | |
2805 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2806 | // | |
2807 | // 1) The symbol may be defined in some other module. | |
2808 | // | |
2809 | // 2) We are building a shared library and this is a | |
2810 | // protected symbol; using GLOB_DAT means that the dynamic | |
2811 | // linker can use the address of the PLT in the main | |
2812 | // executable when appropriate so that function address | |
2813 | // comparisons work. | |
2814 | // | |
2815 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2816 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
2817 | if (gsym->is_from_dynobj() |
2818 | || gsym->is_undefined() | |
2819 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2820 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2821 | && parameters->options().shared()) | |
7223e9ca ILT |
2822 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2823 | && parameters->options().output_is_position_independent())) | |
2e702c99 | 2824 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
83896202 | 2825 | elfcpp::R_X86_64_GLOB_DAT); |
2e702c99 RM |
2826 | else |
2827 | { | |
7223e9ca ILT |
2828 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2829 | // offset into the GOT, so that function pointer | |
2830 | // comparisons work correctly. | |
2831 | bool is_new; | |
2832 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2833 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2834 | else | |
2835 | { | |
2836 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2837 | // Tell the dynamic linker to use the PLT address | |
2838 | // when resolving relocations. | |
2839 | if (gsym->is_from_dynobj() | |
2840 | && !parameters->options().shared()) | |
2841 | gsym->set_needs_dynsym_value(); | |
2842 | } | |
2e702c99 | 2843 | if (is_new) |
7223e9ca ILT |
2844 | { |
2845 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2846 | rela_dyn->add_global_relative(gsym, | |
2847 | elfcpp::R_X86_64_RELATIVE, | |
13cf9988 | 2848 | got, got_off, 0, false); |
7223e9ca | 2849 | } |
2e702c99 RM |
2850 | } |
2851 | } | |
2852 | // For GOTPLT64, we also need a PLT entry (but only if the | |
2853 | // symbol is not fully resolved). | |
2854 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
2855 | && !gsym->final_value_is_known()) | |
2856 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2857 | } |
2858 | break; | |
2859 | ||
2860 | case elfcpp::R_X86_64_PLT32: | |
2861 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
2862 | // Otherwise we need a PLT entry. | |
2863 | if (gsym->final_value_is_known()) | |
2864 | break; | |
96f2030e ILT |
2865 | // If building a shared library, we can also skip the PLT entry |
2866 | // if the symbol is defined in the output file and is protected | |
2867 | // or hidden. | |
2868 | if (gsym->is_defined() | |
2e702c99 RM |
2869 | && !gsym->is_from_dynobj() |
2870 | && !gsym->is_preemptible()) | |
96f2030e | 2871 | break; |
2e30d253 ILT |
2872 | target->make_plt_entry(symtab, layout, gsym); |
2873 | break; | |
2874 | ||
fdc2f80f | 2875 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2876 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2877 | case elfcpp::R_X86_64_GOTPC64: |
2878 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2879 | // We need a GOT section. |
2880 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2881 | // For PLTOFF64, we also need a PLT entry (but only if the |
2882 | // symbol is not fully resolved). | |
2883 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
2884 | && !gsym->final_value_is_known()) | |
2885 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2886 | break; |
2887 | ||
2e30d253 ILT |
2888 | case elfcpp::R_X86_64_COPY: |
2889 | case elfcpp::R_X86_64_GLOB_DAT: | |
2890 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2891 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2892 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2893 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 2894 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2895 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 2896 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2897 | gold_error(_("%s: unexpected reloc %u in object file"), |
2898 | object->name().c_str(), r_type); | |
2e30d253 | 2899 | break; |
2e30d253 | 2900 | |
d61c17ea | 2901 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
2902 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2903 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2904 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2905 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2906 | case elfcpp::R_X86_64_DTPOFF32: |
2907 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2908 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2909 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
2910 | { |
2911 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d | 2912 | const tls::Tls_optimization optimized_type |
2e702c99 | 2913 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2914 | switch (r_type) |
2915 | { | |
2e702c99 | 2916 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
2917 | if (optimized_type == tls::TLSOPT_NONE) |
2918 | { | |
2e702c99 RM |
2919 | // Create a pair of GOT entries for the module index and |
2920 | // dtv-relative offset. | |
2921 | Output_data_got<64, false>* got | |
2922 | = target->got_section(symtab, layout); | |
2923 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, | |
83896202 ILT |
2924 | target->rela_dyn_section(layout), |
2925 | elfcpp::R_X86_64_DTPMOD64, | |
2926 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
2927 | } |
2928 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2929 | { | |
2e702c99 RM |
2930 | // Create a GOT entry for the tp-relative offset. |
2931 | Output_data_got<64, false>* got | |
2932 | = target->got_section(symtab, layout); | |
2933 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2934 | target->rela_dyn_section(layout), |
2935 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
2936 | } |
2937 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2938 | unsupported_reloc_global(object, r_type, gsym); | |
2939 | break; | |
2940 | ||
2e702c99 RM |
2941 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
2942 | target->define_tls_base_symbol(symtab, layout); | |
c2b45e22 CC |
2943 | if (optimized_type == tls::TLSOPT_NONE) |
2944 | { | |
2e702c99 RM |
2945 | // Create reserved PLT and GOT entries for the resolver. |
2946 | target->reserve_tlsdesc_entries(symtab, layout); | |
2947 | ||
2948 | // Create a double GOT entry with an R_X86_64_TLSDESC | |
2949 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
2950 | // lazily, so the GOT entry needs to be in an area in | |
2951 | // .got.plt, not .got. Call got_section to make sure | |
2952 | // the section has been created. | |
a8df5856 | 2953 | target->got_section(symtab, layout); |
2e702c99 | 2954 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); |
ca09d69a | 2955 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
2e702c99 | 2956 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
83896202 | 2957 | elfcpp::R_X86_64_TLSDESC, 0); |
c2b45e22 CC |
2958 | } |
2959 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2960 | { | |
2e702c99 RM |
2961 | // Create a GOT entry for the tp-relative offset. |
2962 | Output_data_got<64, false>* got | |
2963 | = target->got_section(symtab, layout); | |
2964 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2965 | target->rela_dyn_section(layout), |
2966 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
2967 | } |
2968 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2969 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
2970 | break; |
2971 | ||
2e702c99 | 2972 | case elfcpp::R_X86_64_TLSDESC_CALL: |
c2b45e22 CC |
2973 | break; |
2974 | ||
2e702c99 | 2975 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2976 | if (optimized_type == tls::TLSOPT_NONE) |
2977 | { | |
2e702c99 RM |
2978 | // Create a GOT entry for the module index. |
2979 | target->got_mod_index_entry(symtab, layout, object); | |
7bf1f802 ILT |
2980 | } |
2981 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2982 | unsupported_reloc_global(object, r_type, gsym); | |
2983 | break; | |
2984 | ||
2e702c99 RM |
2985 | case elfcpp::R_X86_64_DTPOFF32: |
2986 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2987 | break; |
2988 | ||
2e702c99 | 2989 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2990 | layout->set_has_static_tls(); |
2e702c99 RM |
2991 | if (optimized_type == tls::TLSOPT_NONE) |
2992 | { | |
2993 | // Create a GOT entry for the tp-relative offset. | |
2994 | Output_data_got<64, false>* got | |
2995 | = target->got_section(symtab, layout); | |
2996 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, | |
83896202 ILT |
2997 | target->rela_dyn_section(layout), |
2998 | elfcpp::R_X86_64_TPOFF64); | |
2e702c99 RM |
2999 | } |
3000 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
3001 | unsupported_reloc_global(object, r_type, gsym); | |
3002 | break; | |
0ffd9845 | 3003 | |
2e702c99 | 3004 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 3005 | layout->set_has_static_tls(); |
2e702c99 RM |
3006 | if (parameters->options().shared()) |
3007 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 3008 | break; |
e041f13d | 3009 | |
2e702c99 RM |
3010 | default: |
3011 | gold_unreachable(); | |
2e30d253 ILT |
3012 | } |
3013 | } | |
3014 | break; | |
fdc2f80f ILT |
3015 | |
3016 | case elfcpp::R_X86_64_SIZE32: | |
3017 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3018 | default: |
75f2446e | 3019 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 3020 | object->name().c_str(), r_type, |
2e702c99 | 3021 | gsym->demangled_name().c_str()); |
2e30d253 ILT |
3022 | break; |
3023 | } | |
3024 | } | |
3025 | ||
fc51264f | 3026 | template<int size> |
6d03d481 | 3027 | void |
fc51264f L |
3028 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
3029 | Layout* layout, | |
3030 | Sized_relobj_file<size, false>* object, | |
3031 | unsigned int data_shndx, | |
3032 | unsigned int sh_type, | |
3033 | const unsigned char* prelocs, | |
3034 | size_t reloc_count, | |
3035 | Output_section* output_section, | |
3036 | bool needs_special_offset_handling, | |
3037 | size_t local_symbol_count, | |
3038 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
3039 | { |
3040 | ||
3041 | if (sh_type == elfcpp::SHT_REL) | |
3042 | { | |
3043 | return; | |
3044 | } | |
3045 | ||
fc51264f | 3046 | gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
2e702c99 | 3047 | typename Target_x86_64<size>::Scan, |
618d6666 | 3048 | typename Target_x86_64<size>::Relocatable_size_for_reloc>( |
6d03d481 ST |
3049 | symtab, |
3050 | layout, | |
3051 | this, | |
3052 | object, | |
3053 | data_shndx, | |
3054 | prelocs, | |
3055 | reloc_count, | |
3056 | output_section, | |
3057 | needs_special_offset_handling, | |
3058 | local_symbol_count, | |
3059 | plocal_symbols); | |
2e702c99 | 3060 | |
6d03d481 | 3061 | } |
2e30d253 ILT |
3062 | // Scan relocations for a section. |
3063 | ||
fc51264f | 3064 | template<int size> |
2e30d253 | 3065 | void |
fc51264f L |
3066 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
3067 | Layout* layout, | |
3068 | Sized_relobj_file<size, false>* object, | |
3069 | unsigned int data_shndx, | |
3070 | unsigned int sh_type, | |
3071 | const unsigned char* prelocs, | |
3072 | size_t reloc_count, | |
3073 | Output_section* output_section, | |
3074 | bool needs_special_offset_handling, | |
3075 | size_t local_symbol_count, | |
3076 | const unsigned char* plocal_symbols) | |
2e30d253 ILT |
3077 | { |
3078 | if (sh_type == elfcpp::SHT_REL) | |
3079 | { | |
75f2446e ILT |
3080 | gold_error(_("%s: unsupported REL reloc section"), |
3081 | object->name().c_str()); | |
3082 | return; | |
2e30d253 ILT |
3083 | } |
3084 | ||
fc51264f | 3085 | gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
618d6666 | 3086 | typename Target_x86_64<size>::Scan>( |
2e30d253 ILT |
3087 | symtab, |
3088 | layout, | |
3089 | this, | |
3090 | object, | |
3091 | data_shndx, | |
3092 | prelocs, | |
3093 | reloc_count, | |
730cdc88 ILT |
3094 | output_section, |
3095 | needs_special_offset_handling, | |
2e30d253 | 3096 | local_symbol_count, |
730cdc88 | 3097 | plocal_symbols); |
2e30d253 ILT |
3098 | } |
3099 | ||
3100 | // Finalize the sections. | |
3101 | ||
fc51264f | 3102 | template<int size> |
2e30d253 | 3103 | void |
fc51264f | 3104 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
3105 | Layout* layout, |
3106 | const Input_objects*, | |
e785ec03 | 3107 | Symbol_table* symtab) |
2e30d253 | 3108 | { |
ea715a34 ILT |
3109 | const Reloc_section* rel_plt = (this->plt_ == NULL |
3110 | ? NULL | |
e291e7b9 | 3111 | : this->plt_->rela_plt()); |
ea715a34 | 3112 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 3113 | this->rela_dyn_, true, false); |
2e702c99 | 3114 | |
2e30d253 ILT |
3115 | // Fill in some more dynamic tags. |
3116 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
3117 | if (odyn != NULL) | |
3118 | { | |
22b127cc | 3119 | if (this->plt_ != NULL |
ea715a34 ILT |
3120 | && this->plt_->output_section() != NULL |
3121 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 3122 | { |
ea715a34 ILT |
3123 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
3124 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
3125 | this->got_->finalize_data_size(); | |
3126 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
3127 | this->plt_, plt_offset); | |
3128 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
3129 | this->got_, got_offset); | |
2e30d253 ILT |
3130 | } |
3131 | } | |
3132 | ||
3133 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
3134 | // relocs. | |
12c0daef ILT |
3135 | if (this->copy_relocs_.any_saved_relocs()) |
3136 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
3137 | |
3138 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
3139 | // the .got.plt section. | |
3140 | Symbol* sym = this->global_offset_table_; | |
3141 | if (sym != NULL) | |
3142 | { | |
3143 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 3144 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 3145 | } |
28a13fec | 3146 | |
67181c72 ILT |
3147 | if (parameters->doing_static_link() |
3148 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
3149 | { |
3150 | // If linking statically, make sure that the __rela_iplt symbols | |
3151 | // were defined if necessary, even if we didn't create a PLT. | |
3152 | static const Define_symbol_in_segment syms[] = | |
3153 | { | |
3154 | { | |
3155 | "__rela_iplt_start", // name | |
3156 | elfcpp::PT_LOAD, // segment_type | |
3157 | elfcpp::PF_W, // segment_flags_set | |
3158 | elfcpp::PF(0), // segment_flags_clear | |
3159 | 0, // value | |
3160 | 0, // size | |
3161 | elfcpp::STT_NOTYPE, // type | |
3162 | elfcpp::STB_GLOBAL, // binding | |
3163 | elfcpp::STV_HIDDEN, // visibility | |
3164 | 0, // nonvis | |
3165 | Symbol::SEGMENT_START, // offset_from_base | |
3166 | true // only_if_ref | |
3167 | }, | |
3168 | { | |
3169 | "__rela_iplt_end", // name | |
3170 | elfcpp::PT_LOAD, // segment_type | |
3171 | elfcpp::PF_W, // segment_flags_set | |
3172 | elfcpp::PF(0), // segment_flags_clear | |
3173 | 0, // value | |
3174 | 0, // size | |
3175 | elfcpp::STT_NOTYPE, // type | |
3176 | elfcpp::STB_GLOBAL, // binding | |
3177 | elfcpp::STV_HIDDEN, // visibility | |
3178 | 0, // nonvis | |
3179 | Symbol::SEGMENT_START, // offset_from_base | |
3180 | true // only_if_ref | |
3181 | } | |
3182 | }; | |
3183 | ||
3184 | symtab->define_symbols(layout, 2, syms, | |
3185 | layout->script_options()->saw_sections_clause()); | |
3186 | } | |
2e30d253 ILT |
3187 | } |
3188 | ||
3189 | // Perform a relocation. | |
3190 | ||
fc51264f | 3191 | template<int size> |
2e30d253 | 3192 | inline bool |
fc51264f L |
3193 | Target_x86_64<size>::Relocate::relocate( |
3194 | const Relocate_info<size, false>* relinfo, | |
3195 | Target_x86_64<size>* target, | |
3196 | Output_section*, | |
3197 | size_t relnum, | |
3198 | const elfcpp::Rela<size, false>& rela, | |
3199 | unsigned int r_type, | |
3200 | const Sized_symbol<size>* gsym, | |
3201 | const Symbol_value<size>* psymval, | |
3202 | unsigned char* view, | |
3203 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3204 | section_size_type view_size) | |
2e30d253 ILT |
3205 | { |
3206 | if (this->skip_call_tls_get_addr_) | |
3207 | { | |
5efc7cd2 | 3208 | if ((r_type != elfcpp::R_X86_64_PLT32 |
2e702c99 | 3209 | && r_type != elfcpp::R_X86_64_PC32) |
2e30d253 | 3210 | || gsym == NULL |
0ffd9845 | 3211 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 3212 | { |
75f2446e ILT |
3213 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3214 | _("missing expected TLS relocation")); | |
3215 | } | |
3216 | else | |
3217 | { | |
3218 | this->skip_call_tls_get_addr_ = false; | |
3219 | return false; | |
2e30d253 | 3220 | } |
2e30d253 ILT |
3221 | } |
3222 | ||
fc51264f | 3223 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
3224 | |
3225 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 3226 | Symbol_value<size> symval; |
96f2030e | 3227 | if (gsym != NULL |
95a2c8d6 | 3228 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 3229 | { |
67181c72 | 3230 | symval.set_output_value(target->plt_address_for_global(gsym) |
2e30d253 ILT |
3231 | + gsym->plt_offset()); |
3232 | psymval = &symval; | |
3233 | } | |
7223e9ca ILT |
3234 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
3235 | { | |
fc51264f | 3236 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
3237 | if (object->local_has_plt_offset(r_sym)) |
3238 | { | |
67181c72 | 3239 | symval.set_output_value(target->plt_address_for_local(object, r_sym) |
7223e9ca ILT |
3240 | + object->local_plt_offset(r_sym)); |
3241 | psymval = &symval; | |
3242 | } | |
3243 | } | |
2e30d253 | 3244 | |
0ffd9845 ILT |
3245 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
3246 | ||
3247 | // Get the GOT offset if needed. | |
96f2030e ILT |
3248 | // The GOT pointer points to the end of the GOT section. |
3249 | // We need to subtract the size of the GOT section to get | |
3250 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
3251 | bool have_got_offset = false; |
3252 | unsigned int got_offset = 0; | |
3253 | switch (r_type) | |
3254 | { | |
3255 | case elfcpp::R_X86_64_GOT32: | |
3256 | case elfcpp::R_X86_64_GOT64: | |
3257 | case elfcpp::R_X86_64_GOTPLT64: | |
3258 | case elfcpp::R_X86_64_GOTPCREL: | |
3259 | case elfcpp::R_X86_64_GOTPCREL64: | |
3260 | if (gsym != NULL) | |
2e702c99 RM |
3261 | { |
3262 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); | |
3263 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
3264 | } | |
0ffd9845 | 3265 | else |
2e702c99 RM |
3266 | { |
3267 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3268 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); | |
3269 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3270 | - target->got_size()); | |
3271 | } | |
0ffd9845 ILT |
3272 | have_got_offset = true; |
3273 | break; | |
3274 | ||
3275 | default: | |
3276 | break; | |
3277 | } | |
2e30d253 ILT |
3278 | |
3279 | switch (r_type) | |
3280 | { | |
3281 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3282 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3283 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3284 | break; |
3285 | ||
3286 | case elfcpp::R_X86_64_64: | |
fc51264f | 3287 | Relocate_functions<size, false>::rela64(view, object, psymval, addend); |
2e30d253 ILT |
3288 | break; |
3289 | ||
3290 | case elfcpp::R_X86_64_PC64: | |
fc51264f | 3291 | Relocate_functions<size, false>::pcrela64(view, object, psymval, addend, |
2e702c99 | 3292 | address); |
2e30d253 ILT |
3293 | break; |
3294 | ||
3295 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
3296 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3297 | // uint64_t x = value + addend; | |
3298 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
3299 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
fc51264f | 3300 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3301 | break; |
3302 | ||
3303 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
3304 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3305 | // int64_t x = value + addend; // note this quantity is signed! | |
3306 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
fc51264f | 3307 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3308 | break; |
3309 | ||
3310 | case elfcpp::R_X86_64_PC32: | |
fc51264f L |
3311 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3312 | address); | |
2e30d253 ILT |
3313 | break; |
3314 | ||
3315 | case elfcpp::R_X86_64_16: | |
fc51264f | 3316 | Relocate_functions<size, false>::rela16(view, object, psymval, addend); |
2e30d253 ILT |
3317 | break; |
3318 | ||
3319 | case elfcpp::R_X86_64_PC16: | |
fc51264f L |
3320 | Relocate_functions<size, false>::pcrela16(view, object, psymval, addend, |
3321 | address); | |
2e30d253 ILT |
3322 | break; |
3323 | ||
3324 | case elfcpp::R_X86_64_8: | |
fc51264f | 3325 | Relocate_functions<size, false>::rela8(view, object, psymval, addend); |
2e30d253 ILT |
3326 | break; |
3327 | ||
3328 | case elfcpp::R_X86_64_PC8: | |
fc51264f L |
3329 | Relocate_functions<size, false>::pcrela8(view, object, psymval, addend, |
3330 | address); | |
2e30d253 ILT |
3331 | break; |
3332 | ||
3333 | case elfcpp::R_X86_64_PLT32: | |
f389a824 | 3334 | gold_assert(gsym == NULL |
2e702c99 | 3335 | || gsym->has_plt_offset() |
99f8faca ILT |
3336 | || gsym->final_value_is_known() |
3337 | || (gsym->is_defined() | |
3338 | && !gsym->is_from_dynobj() | |
3339 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
3340 | // Note: while this code looks the same as for R_X86_64_PC32, it |
3341 | // behaves differently because psymval was set to point to | |
3342 | // the PLT entry, rather than the symbol, in Scan::global(). | |
fc51264f L |
3343 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3344 | address); | |
2e30d253 ILT |
3345 | break; |
3346 | ||
ee9e9e86 ILT |
3347 | case elfcpp::R_X86_64_PLTOFF64: |
3348 | { | |
2e702c99 RM |
3349 | gold_assert(gsym); |
3350 | gold_assert(gsym->has_plt_offset() | |
3351 | || gsym->final_value_is_known()); | |
fc51264f | 3352 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
ee9e9e86 | 3353 | got_address = target->got_section(NULL, NULL)->address(); |
fc51264f L |
3354 | Relocate_functions<size, false>::rela64(view, object, psymval, |
3355 | addend - got_address); | |
ee9e9e86 ILT |
3356 | } |
3357 | ||
2e30d253 | 3358 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 3359 | gold_assert(have_got_offset); |
fc51264f | 3360 | Relocate_functions<size, false>::rela32(view, got_offset, addend); |
2e30d253 ILT |
3361 | break; |
3362 | ||
e822f2b1 ILT |
3363 | case elfcpp::R_X86_64_GOTPC32: |
3364 | { | |
2e702c99 | 3365 | gold_assert(gsym); |
fc51264f | 3366 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3367 | value = target->got_plt_section()->address(); |
fc51264f | 3368 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
e822f2b1 ILT |
3369 | } |
3370 | break; | |
3371 | ||
3372 | case elfcpp::R_X86_64_GOT64: | |
3373 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
3374 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 3375 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 3376 | gold_assert(have_got_offset); |
fc51264f | 3377 | Relocate_functions<size, false>::rela64(view, got_offset, addend); |
e822f2b1 ILT |
3378 | break; |
3379 | ||
3380 | case elfcpp::R_X86_64_GOTPC64: | |
3381 | { | |
2e702c99 | 3382 | gold_assert(gsym); |
fc51264f | 3383 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3384 | value = target->got_plt_section()->address(); |
fc51264f | 3385 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
3386 | } |
3387 | break; | |
3388 | ||
2e30d253 ILT |
3389 | case elfcpp::R_X86_64_GOTOFF64: |
3390 | { | |
fc51264f | 3391 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
2e30d253 | 3392 | value = (psymval->value(object, 0) |
96f2030e | 3393 | - target->got_plt_section()->address()); |
fc51264f | 3394 | Relocate_functions<size, false>::rela64(view, value, addend); |
2e30d253 ILT |
3395 | } |
3396 | break; | |
3397 | ||
3398 | case elfcpp::R_X86_64_GOTPCREL: | |
3399 | { | |
2e702c99 RM |
3400 | gold_assert(have_got_offset); |
3401 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3402 | value = target->got_plt_section()->address() + got_offset; | |
3403 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); | |
2e30d253 ILT |
3404 | } |
3405 | break; | |
3406 | ||
e822f2b1 ILT |
3407 | case elfcpp::R_X86_64_GOTPCREL64: |
3408 | { | |
2e702c99 RM |
3409 | gold_assert(have_got_offset); |
3410 | typename elfcpp::Elf_types<size>::Elf_Addr value; | |
3411 | value = target->got_plt_section()->address() + got_offset; | |
3412 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); | |
e822f2b1 ILT |
3413 | } |
3414 | break; | |
3415 | ||
2e30d253 ILT |
3416 | case elfcpp::R_X86_64_COPY: |
3417 | case elfcpp::R_X86_64_GLOB_DAT: | |
3418 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3419 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3420 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3421 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3422 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3423 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3424 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3425 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3426 | _("unexpected reloc %u in object file"), | |
3427 | r_type); | |
2e30d253 ILT |
3428 | break; |
3429 | ||
d61c17ea | 3430 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3431 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3432 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3433 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3434 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3435 | case elfcpp::R_X86_64_DTPOFF32: |
3436 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3437 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3438 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 | 3439 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
2e702c99 | 3440 | view, address, view_size); |
2e30d253 | 3441 | break; |
2e30d253 | 3442 | |
fdc2f80f ILT |
3443 | case elfcpp::R_X86_64_SIZE32: |
3444 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3445 | default: |
75f2446e ILT |
3446 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3447 | _("unsupported reloc %u"), | |
3448 | r_type); | |
2e30d253 ILT |
3449 | break; |
3450 | } | |
3451 | ||
3452 | return true; | |
3453 | } | |
3454 | ||
3455 | // Perform a TLS relocation. | |
3456 | ||
fc51264f | 3457 | template<int size> |
2e30d253 | 3458 | inline void |
fc51264f L |
3459 | Target_x86_64<size>::Relocate::relocate_tls( |
3460 | const Relocate_info<size, false>* relinfo, | |
3461 | Target_x86_64<size>* target, | |
3462 | size_t relnum, | |
3463 | const elfcpp::Rela<size, false>& rela, | |
3464 | unsigned int r_type, | |
3465 | const Sized_symbol<size>* gsym, | |
3466 | const Symbol_value<size>* psymval, | |
3467 | unsigned char* view, | |
3468 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3469 | section_size_type view_size) | |
2e30d253 | 3470 | { |
2e30d253 | 3471 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 3472 | |
fc51264f | 3473 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 3474 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 3475 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 3476 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 3477 | |
fc51264f | 3478 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
3479 | |
3480 | const bool is_final = (gsym == NULL | |
b3705d2a | 3481 | ? !parameters->options().shared() |
2e30d253 | 3482 | : gsym->final_value_is_known()); |
36171d64 | 3483 | tls::Tls_optimization optimized_type |
fc51264f | 3484 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3485 | switch (r_type) |
3486 | { | |
56622147 | 3487 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
3488 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3489 | { | |
3490 | // If this code sequence is used in a non-executable section, | |
3491 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
3492 | // on the assumption that it's being used by itself in a debug | |
3493 | // section. Therefore, in the unlikely event that the code | |
3494 | // sequence appears in a non-executable section, we simply | |
3495 | // leave it unoptimized. | |
3496 | optimized_type = tls::TLSOPT_NONE; | |
3497 | } | |
e041f13d | 3498 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 3499 | { |
62855347 ILT |
3500 | if (tls_segment == NULL) |
3501 | { | |
191f1a2d ILT |
3502 | gold_assert(parameters->errors()->error_count() > 0 |
3503 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3504 | return; |
3505 | } | |
2e30d253 | 3506 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 3507 | rela, r_type, value, view, |
2e30d253 ILT |
3508 | view_size); |
3509 | break; | |
3510 | } | |
7bf1f802 | 3511 | else |
2e702c99 RM |
3512 | { |
3513 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3514 | ? GOT_TYPE_TLS_OFFSET | |
3515 | : GOT_TYPE_TLS_PAIR); | |
3516 | unsigned int got_offset; | |
3517 | if (gsym != NULL) | |
3518 | { | |
3519 | gold_assert(gsym->has_got_offset(got_type)); | |
3520 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
3521 | } | |
3522 | else | |
3523 | { | |
3524 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3525 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3526 | got_offset = (object->local_got_offset(r_sym, got_type) | |
3527 | - target->got_size()); | |
3528 | } | |
3529 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3530 | { | |
3531 | value = target->got_plt_section()->address() + got_offset; | |
3532 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, | |
3533 | value, view, address, view_size); | |
3534 | break; | |
3535 | } | |
3536 | else if (optimized_type == tls::TLSOPT_NONE) | |
3537 | { | |
3538 | // Relocate the field with the offset of the pair of GOT | |
3539 | // entries. | |
6a41d30b | 3540 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3541 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3542 | address); |
2e702c99 RM |
3543 | break; |
3544 | } | |
3545 | } | |
72ec2876 | 3546 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3547 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
3548 | break; |
3549 | ||
c2b45e22 CC |
3550 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
3551 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
3552 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3553 | { | |
3554 | // See above comment for R_X86_64_TLSGD. | |
3555 | optimized_type = tls::TLSOPT_NONE; | |
3556 | } | |
c2b45e22 CC |
3557 | if (optimized_type == tls::TLSOPT_TO_LE) |
3558 | { | |
62855347 ILT |
3559 | if (tls_segment == NULL) |
3560 | { | |
191f1a2d ILT |
3561 | gold_assert(parameters->errors()->error_count() > 0 |
3562 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3563 | return; |
3564 | } | |
c2b45e22 | 3565 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
2e702c99 RM |
3566 | rela, r_type, value, view, |
3567 | view_size); | |
c2b45e22 CC |
3568 | break; |
3569 | } | |
3570 | else | |
2e702c99 RM |
3571 | { |
3572 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3573 | ? GOT_TYPE_TLS_OFFSET | |
3574 | : GOT_TYPE_TLS_DESC); | |
3575 | unsigned int got_offset = 0; | |
a8df5856 ILT |
3576 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC |
3577 | && optimized_type == tls::TLSOPT_NONE) | |
3578 | { | |
3579 | // We created GOT entries in the .got.tlsdesc portion of | |
3580 | // the .got.plt section, but the offset stored in the | |
3581 | // symbol is the offset within .got.tlsdesc. | |
3582 | got_offset = (target->got_size() | |
3583 | + target->got_plt_section()->data_size()); | |
3584 | } | |
2e702c99 RM |
3585 | if (gsym != NULL) |
3586 | { | |
3587 | gold_assert(gsym->has_got_offset(got_type)); | |
3588 | got_offset += gsym->got_offset(got_type) - target->got_size(); | |
3589 | } | |
3590 | else | |
3591 | { | |
3592 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3593 | gold_assert(object->local_has_got_offset(r_sym, got_type)); | |
3594 | got_offset += (object->local_got_offset(r_sym, got_type) | |
a8df5856 | 3595 | - target->got_size()); |
2e702c99 RM |
3596 | } |
3597 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3598 | { | |
62855347 ILT |
3599 | if (tls_segment == NULL) |
3600 | { | |
191f1a2d ILT |
3601 | gold_assert(parameters->errors()->error_count() > 0 |
3602 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3603 | return; |
3604 | } | |
2e702c99 RM |
3605 | value = target->got_plt_section()->address() + got_offset; |
3606 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
3607 | rela, r_type, value, view, address, | |
3608 | view_size); | |
3609 | break; | |
3610 | } | |
3611 | else if (optimized_type == tls::TLSOPT_NONE) | |
3612 | { | |
3613 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3614 | { | |
3615 | // Relocate the field with the offset of the pair of GOT | |
3616 | // entries. | |
3617 | value = target->got_plt_section()->address() + got_offset; | |
3618 | Relocate_functions<size, false>::pcrela32(view, value, addend, | |
fc51264f | 3619 | address); |
2e702c99 RM |
3620 | } |
3621 | break; | |
3622 | } | |
3623 | } | |
c2b45e22 CC |
3624 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3625 | _("unsupported reloc %u"), r_type); | |
3626 | break; | |
3627 | ||
56622147 | 3628 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
3629 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3630 | { | |
3631 | // See above comment for R_X86_64_TLSGD. | |
3632 | optimized_type = tls::TLSOPT_NONE; | |
3633 | } | |
e041f13d | 3634 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e702c99 | 3635 | { |
62855347 ILT |
3636 | if (tls_segment == NULL) |
3637 | { | |
191f1a2d ILT |
3638 | gold_assert(parameters->errors()->error_count() > 0 |
3639 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3640 | return; |
3641 | } | |
72ec2876 ILT |
3642 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
3643 | value, view, view_size); | |
3644 | break; | |
2e702c99 | 3645 | } |
7bf1f802 | 3646 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3647 | { |
3648 | // Relocate the field with the offset of the GOT entry for | |
3649 | // the module index. | |
3650 | unsigned int got_offset; | |
3651 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) | |
31d60480 | 3652 | - target->got_size()); |
6a41d30b | 3653 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3654 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3655 | address); |
2e702c99 RM |
3656 | break; |
3657 | } | |
72ec2876 | 3658 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3659 | _("unsupported reloc %u"), r_type); |
2e30d253 | 3660 | break; |
0ffd9845 ILT |
3661 | |
3662 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
3663 | // This relocation type is used in debugging information. |
3664 | // In that case we need to not optimize the value. If the | |
3665 | // section is not executable, then we assume we should not | |
3666 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
3667 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
3668 | // R_X86_64_TLSLD. | |
3669 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3670 | { | |
62855347 ILT |
3671 | if (tls_segment == NULL) |
3672 | { | |
191f1a2d ILT |
3673 | gold_assert(parameters->errors()->error_count() > 0 |
3674 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3675 | return; |
3676 | } | |
36171d64 CC |
3677 | value -= tls_segment->memsz(); |
3678 | } | |
fc51264f | 3679 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
3680 | break; |
3681 | ||
3682 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
3683 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
3684 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3685 | { | |
62855347 ILT |
3686 | if (tls_segment == NULL) |
3687 | { | |
191f1a2d ILT |
3688 | gold_assert(parameters->errors()->error_count() > 0 |
3689 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3690 | return; |
3691 | } | |
36171d64 CC |
3692 | value -= tls_segment->memsz(); |
3693 | } | |
fc51264f | 3694 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 3695 | break; |
2e30d253 | 3696 | |
56622147 ILT |
3697 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3698 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3699 | { | |
62855347 ILT |
3700 | if (tls_segment == NULL) |
3701 | { | |
191f1a2d ILT |
3702 | gold_assert(parameters->errors()->error_count() > 0 |
3703 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3704 | return; |
3705 | } | |
fc51264f L |
3706 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
3707 | tls_segment, rela, | |
3708 | r_type, value, view, | |
3709 | view_size); | |
56622147 ILT |
3710 | break; |
3711 | } | |
7bf1f802 | 3712 | else if (optimized_type == tls::TLSOPT_NONE) |
2e702c99 RM |
3713 | { |
3714 | // Relocate the field with the offset of the GOT entry for | |
3715 | // the tp-relative offset of the symbol. | |
3716 | unsigned int got_offset; | |
3717 | if (gsym != NULL) | |
3718 | { | |
3719 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); | |
3720 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
3721 | - target->got_size()); | |
3722 | } | |
3723 | else | |
3724 | { | |
3725 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); | |
3726 | gold_assert(object->local_has_got_offset(r_sym, | |
3727 | GOT_TYPE_TLS_OFFSET)); | |
3728 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
3729 | - target->got_size()); | |
3730 | } | |
6a41d30b | 3731 | value = target->got_plt_section()->address() + got_offset; |
2e702c99 | 3732 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
fc51264f | 3733 | address); |
2e702c99 RM |
3734 | break; |
3735 | } | |
56622147 ILT |
3736 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3737 | _("unsupported reloc type %u"), | |
3738 | r_type); | |
3739 | break; | |
0ffd9845 | 3740 | |
56622147 | 3741 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
3742 | if (tls_segment == NULL) |
3743 | { | |
191f1a2d ILT |
3744 | gold_assert(parameters->errors()->error_count() > 0 |
3745 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3746 | return; |
3747 | } | |
6a41d30b | 3748 | value -= tls_segment->memsz(); |
fc51264f | 3749 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 3750 | break; |
2e30d253 | 3751 | } |
2e30d253 ILT |
3752 | } |
3753 | ||
7bf1f802 ILT |
3754 | // Do a relocation in which we convert a TLS General-Dynamic to an |
3755 | // Initial-Exec. | |
3756 | ||
fc51264f | 3757 | template<int size> |
7bf1f802 | 3758 | inline void |
fc51264f L |
3759 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
3760 | const Relocate_info<size, false>* relinfo, | |
3761 | size_t relnum, | |
3762 | Output_segment*, | |
3763 | const elfcpp::Rela<size, false>& rela, | |
3764 | unsigned int, | |
3765 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3766 | unsigned char* view, | |
3767 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3768 | section_size_type view_size) | |
7bf1f802 | 3769 | { |
41194d9f L |
3770 | // For SIZE == 64: |
3771 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3772 | // .word 0x6666; rex64; call __tls_get_addr | |
3773 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
3774 | // For SIZE == 32: | |
3775 | // leaq foo@tlsgd(%rip),%rdi; | |
3776 | // .word 0x6666; rex64; call __tls_get_addr | |
3777 | // ==> movl %fs:0,%eax; addq x@gottpoff(%rip),%rax | |
7bf1f802 | 3778 | |
7bf1f802 | 3779 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
7bf1f802 | 3780 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 3781 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
7bf1f802 | 3782 | |
41194d9f L |
3783 | if (size == 64) |
3784 | { | |
3785 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3786 | -4); | |
3787 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3788 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3789 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3790 | 16); | |
3791 | } | |
3792 | else | |
3793 | { | |
3794 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3795 | -3); | |
3796 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3797 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
3798 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", | |
3799 | 15); | |
3800 | } | |
7bf1f802 | 3801 | |
c2b45e22 | 3802 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
3803 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
3804 | address); | |
7bf1f802 ILT |
3805 | |
3806 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3807 | // We can skip it. | |
3808 | this->skip_call_tls_get_addr_ = true; | |
3809 | } | |
3810 | ||
e041f13d | 3811 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
3812 | // Local-Exec. |
3813 | ||
fc51264f | 3814 | template<int size> |
2e30d253 | 3815 | inline void |
fc51264f L |
3816 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
3817 | const Relocate_info<size, false>* relinfo, | |
3818 | size_t relnum, | |
3819 | Output_segment* tls_segment, | |
3820 | const elfcpp::Rela<size, false>& rela, | |
3821 | unsigned int, | |
3822 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3823 | unsigned char* view, | |
3824 | section_size_type view_size) | |
2e30d253 | 3825 | { |
41194d9f L |
3826 | // For SIZE == 64: |
3827 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3828 | // .word 0x6666; rex64; call __tls_get_addr | |
3829 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
3830 | // For SIZE == 32: | |
3831 | // leaq foo@tlsgd(%rip),%rdi; | |
3832 | // .word 0x6666; rex64; call __tls_get_addr | |
3833 | // ==> movl %fs:0,%eax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 3834 | |
72ec2876 | 3835 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); |
72ec2876 | 3836 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
41194d9f L |
3837 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); |
3838 | ||
3839 | if (size == 64) | |
3840 | { | |
3841 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3842 | -4); | |
3843 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3844 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3845 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", | |
3846 | 16); | |
3847 | } | |
3848 | else | |
3849 | { | |
3850 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, | |
3851 | -3); | |
3852 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3853 | (memcmp(view - 3, "\x48\x8d\x3d", 3) == 0)); | |
2e30d253 | 3854 | |
41194d9f L |
3855 | memcpy(view - 3, "\x64\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", |
3856 | 15); | |
3857 | } | |
2e30d253 | 3858 | |
6a41d30b | 3859 | value -= tls_segment->memsz(); |
fc51264f | 3860 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
3861 | |
3862 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3863 | // We can skip it. | |
3864 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3865 | } |
3866 | ||
c2b45e22 CC |
3867 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
3868 | ||
fc51264f | 3869 | template<int size> |
c2b45e22 | 3870 | inline void |
fc51264f L |
3871 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
3872 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3873 | size_t relnum, |
3874 | Output_segment*, | |
fc51264f | 3875 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3876 | unsigned int r_type, |
fc51264f | 3877 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 3878 | unsigned char* view, |
fc51264f | 3879 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
3880 | section_size_type view_size) |
3881 | { | |
3882 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3883 | { | |
3884 | // leaq foo@tlsdesc(%rip), %rax | |
3885 | // ==> movq foo@gottpoff(%rip), %rax | |
3886 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3887 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3888 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3889 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
3890 | view[-2] = 0x8b; |
3891 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 3892 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
3893 | } |
3894 | else | |
3895 | { | |
3896 | // call *foo@tlscall(%rax) | |
3897 | // ==> nop; nop | |
3898 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3899 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3900 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3901 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3902 | view[0] = 0x66; |
3903 | view[1] = 0x90; | |
3904 | } | |
3905 | } | |
3906 | ||
3907 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
3908 | ||
fc51264f | 3909 | template<int size> |
c2b45e22 | 3910 | inline void |
fc51264f L |
3911 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
3912 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3913 | size_t relnum, |
3914 | Output_segment* tls_segment, | |
fc51264f | 3915 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3916 | unsigned int r_type, |
fc51264f | 3917 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
3918 | unsigned char* view, |
3919 | section_size_type view_size) | |
3920 | { | |
3921 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3922 | { | |
3923 | // leaq foo@tlsdesc(%rip), %rax | |
3924 | // ==> movq foo@tpoff, %rax | |
3925 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3926 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3927 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3928 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); |
c2b45e22 CC |
3929 | view[-2] = 0xc7; |
3930 | view[-1] = 0xc0; | |
3931 | value -= tls_segment->memsz(); | |
fc51264f | 3932 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
3933 | } |
3934 | else | |
3935 | { | |
3936 | // call *foo@tlscall(%rax) | |
3937 | // ==> nop; nop | |
3938 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3939 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3940 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
2e702c99 | 3941 | view[0] == 0xff && view[1] == 0x10); |
c2b45e22 CC |
3942 | view[0] = 0x66; |
3943 | view[1] = 0x90; | |
3944 | } | |
3945 | } | |
3946 | ||
fc51264f | 3947 | template<int size> |
2e30d253 | 3948 | inline void |
fc51264f L |
3949 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
3950 | const Relocate_info<size, false>* relinfo, | |
3951 | size_t relnum, | |
3952 | Output_segment*, | |
3953 | const elfcpp::Rela<size, false>& rela, | |
3954 | unsigned int, | |
3955 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
3956 | unsigned char* view, | |
3957 | section_size_type view_size) | |
2e30d253 | 3958 | { |
72ec2876 ILT |
3959 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
3960 | // ... leq foo@dtpoff(%rax),%reg | |
3961 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 3962 | |
72ec2876 ILT |
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, 9); | |
2e30d253 | 3965 | |
72ec2876 | 3966 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
2e702c99 | 3967 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); |
72ec2876 ILT |
3968 | |
3969 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
3970 | ||
3971 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
3972 | ||
3973 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3974 | // We can skip it. | |
3975 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3976 | } |
3977 | ||
56622147 ILT |
3978 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3979 | // Local-Exec. | |
3980 | ||
fc51264f | 3981 | template<int size> |
56622147 | 3982 | inline void |
fc51264f L |
3983 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
3984 | const Relocate_info<size, false>* relinfo, | |
3985 | size_t relnum, | |
3986 | Output_segment* tls_segment, | |
3987 | const elfcpp::Rela<size, false>& rela, | |
3988 | unsigned int, | |
3989 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3990 | unsigned char* view, | |
3991 | section_size_type view_size) | |
56622147 ILT |
3992 | { |
3993 | // We need to examine the opcodes to figure out which instruction we | |
3994 | // are looking at. | |
3995 | ||
3996 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
3997 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
3998 | ||
3999 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
4000 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
4001 | ||
4002 | unsigned char op1 = view[-3]; | |
4003 | unsigned char op2 = view[-2]; | |
4004 | unsigned char op3 = view[-1]; | |
4005 | unsigned char reg = op3 >> 3; | |
4006 | ||
4007 | if (op2 == 0x8b) | |
4008 | { | |
4009 | // movq | |
4010 | if (op1 == 0x4c) | |
2e702c99 | 4011 | view[-3] = 0x49; |
56622147 ILT |
4012 | view[-2] = 0xc7; |
4013 | view[-1] = 0xc0 | reg; | |
4014 | } | |
4015 | else if (reg == 4) | |
4016 | { | |
4017 | // Special handling for %rsp. | |
4018 | if (op1 == 0x4c) | |
2e702c99 | 4019 | view[-3] = 0x49; |
56622147 ILT |
4020 | view[-2] = 0x81; |
4021 | view[-1] = 0xc0 | reg; | |
4022 | } | |
4023 | else | |
4024 | { | |
4025 | // addq | |
4026 | if (op1 == 0x4c) | |
2e702c99 | 4027 | view[-3] = 0x4d; |
56622147 ILT |
4028 | view[-2] = 0x8d; |
4029 | view[-1] = 0x80 | reg | (reg << 3); | |
4030 | } | |
4031 | ||
6a41d30b | 4032 | value -= tls_segment->memsz(); |
fc51264f | 4033 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
4034 | } |
4035 | ||
2e30d253 ILT |
4036 | // Relocate section data. |
4037 | ||
fc51264f | 4038 | template<int size> |
2e30d253 | 4039 | void |
fc51264f L |
4040 | Target_x86_64<size>::relocate_section( |
4041 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
4042 | unsigned int sh_type, |
4043 | const unsigned char* prelocs, | |
4044 | size_t reloc_count, | |
4045 | Output_section* output_section, | |
4046 | bool needs_special_offset_handling, | |
4047 | unsigned char* view, | |
fc51264f | 4048 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
4049 | section_size_type view_size, |
4050 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
4051 | { |
4052 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4053 | ||
fc51264f | 4054 | gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
618d6666 | 4055 | typename Target_x86_64<size>::Relocate>( |
2e30d253 ILT |
4056 | relinfo, |
4057 | this, | |
4058 | prelocs, | |
4059 | reloc_count, | |
730cdc88 ILT |
4060 | output_section, |
4061 | needs_special_offset_handling, | |
2e30d253 ILT |
4062 | view, |
4063 | address, | |
364c7fa5 ILT |
4064 | view_size, |
4065 | reloc_symbol_changes); | |
2e30d253 ILT |
4066 | } |
4067 | ||
94a3fc8b CC |
4068 | // Apply an incremental relocation. Incremental relocations always refer |
4069 | // to global symbols. | |
4070 | ||
fc51264f | 4071 | template<int size> |
94a3fc8b | 4072 | void |
fc51264f L |
4073 | Target_x86_64<size>::apply_relocation( |
4074 | const Relocate_info<size, false>* relinfo, | |
4075 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 4076 | unsigned int r_type, |
fc51264f | 4077 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
4078 | const Symbol* gsym, |
4079 | unsigned char* view, | |
fc51264f | 4080 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
4081 | section_size_type view_size) |
4082 | { | |
fc51264f | 4083 | gold::apply_relocation<size, false, Target_x86_64<size>, |
618d6666 | 4084 | typename Target_x86_64<size>::Relocate>( |
94a3fc8b CC |
4085 | relinfo, |
4086 | this, | |
4087 | r_offset, | |
4088 | r_type, | |
4089 | r_addend, | |
4090 | gsym, | |
4091 | view, | |
4092 | address, | |
4093 | view_size); | |
4094 | } | |
4095 | ||
6a74a719 ILT |
4096 | // Return the size of a relocation while scanning during a relocatable |
4097 | // link. | |
4098 | ||
fc51264f | 4099 | template<int size> |
6a74a719 | 4100 | unsigned int |
fc51264f | 4101 | Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc( |
6a74a719 ILT |
4102 | unsigned int r_type, |
4103 | Relobj* object) | |
4104 | { | |
4105 | switch (r_type) | |
4106 | { | |
4107 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
4108 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
4109 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
4110 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
4111 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
4112 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
4113 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
4114 | case elfcpp::R_X86_64_DTPOFF32: | |
4115 | case elfcpp::R_X86_64_DTPOFF64: | |
4116 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
4117 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
4118 | return 0; | |
4119 | ||
4120 | case elfcpp::R_X86_64_64: | |
4121 | case elfcpp::R_X86_64_PC64: | |
4122 | case elfcpp::R_X86_64_GOTOFF64: | |
4123 | case elfcpp::R_X86_64_GOTPC64: | |
4124 | case elfcpp::R_X86_64_PLTOFF64: | |
4125 | case elfcpp::R_X86_64_GOT64: | |
4126 | case elfcpp::R_X86_64_GOTPCREL64: | |
4127 | case elfcpp::R_X86_64_GOTPCREL: | |
4128 | case elfcpp::R_X86_64_GOTPLT64: | |
4129 | return 8; | |
4130 | ||
4131 | case elfcpp::R_X86_64_32: | |
4132 | case elfcpp::R_X86_64_32S: | |
4133 | case elfcpp::R_X86_64_PC32: | |
4134 | case elfcpp::R_X86_64_PLT32: | |
4135 | case elfcpp::R_X86_64_GOTPC32: | |
4136 | case elfcpp::R_X86_64_GOT32: | |
4137 | return 4; | |
4138 | ||
4139 | case elfcpp::R_X86_64_16: | |
4140 | case elfcpp::R_X86_64_PC16: | |
4141 | return 2; | |
4142 | ||
4143 | case elfcpp::R_X86_64_8: | |
4144 | case elfcpp::R_X86_64_PC8: | |
4145 | return 1; | |
4146 | ||
4147 | case elfcpp::R_X86_64_COPY: | |
4148 | case elfcpp::R_X86_64_GLOB_DAT: | |
4149 | case elfcpp::R_X86_64_JUMP_SLOT: | |
4150 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 4151 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
4152 | // These are outstanding tls relocs, which are unexpected when linking |
4153 | case elfcpp::R_X86_64_TPOFF64: | |
4154 | case elfcpp::R_X86_64_DTPMOD64: | |
4155 | case elfcpp::R_X86_64_TLSDESC: | |
4156 | object->error(_("unexpected reloc %u in object file"), r_type); | |
4157 | return 0; | |
4158 | ||
4159 | case elfcpp::R_X86_64_SIZE32: | |
4160 | case elfcpp::R_X86_64_SIZE64: | |
4161 | default: | |
4162 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
4163 | return 0; | |
4164 | } | |
4165 | } | |
4166 | ||
4167 | // Scan the relocs during a relocatable link. | |
4168 | ||
fc51264f | 4169 | template<int size> |
6a74a719 | 4170 | void |
fc51264f L |
4171 | Target_x86_64<size>::scan_relocatable_relocs( |
4172 | Symbol_table* symtab, | |
4173 | Layout* layout, | |
4174 | Sized_relobj_file<size, false>* object, | |
4175 | unsigned int data_shndx, | |
4176 | unsigned int sh_type, | |
4177 | const unsigned char* prelocs, | |
4178 | size_t reloc_count, | |
4179 | Output_section* output_section, | |
4180 | bool needs_special_offset_handling, | |
4181 | size_t local_symbol_count, | |
4182 | const unsigned char* plocal_symbols, | |
4183 | Relocatable_relocs* rr) | |
6a74a719 ILT |
4184 | { |
4185 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4186 | ||
4187 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
4188 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
4189 | ||
fc51264f | 4190 | gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA, |
6a74a719 | 4191 | Scan_relocatable_relocs>( |
6a74a719 ILT |
4192 | symtab, |
4193 | layout, | |
4194 | object, | |
4195 | data_shndx, | |
4196 | prelocs, | |
4197 | reloc_count, | |
4198 | output_section, | |
4199 | needs_special_offset_handling, | |
4200 | local_symbol_count, | |
4201 | plocal_symbols, | |
4202 | rr); | |
4203 | } | |
4204 | ||
4205 | // Relocate a section during a relocatable link. | |
4206 | ||
fc51264f | 4207 | template<int size> |
6a74a719 | 4208 | void |
fc51264f L |
4209 | Target_x86_64<size>::relocate_for_relocatable( |
4210 | const Relocate_info<size, false>* relinfo, | |
6a74a719 ILT |
4211 | unsigned int sh_type, |
4212 | const unsigned char* prelocs, | |
4213 | size_t reloc_count, | |
4214 | Output_section* output_section, | |
4215 | off_t offset_in_output_section, | |
4216 | const Relocatable_relocs* rr, | |
4217 | unsigned char* view, | |
fc51264f | 4218 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
4219 | section_size_type view_size, |
4220 | unsigned char* reloc_view, | |
4221 | section_size_type reloc_view_size) | |
4222 | { | |
4223 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
4224 | ||
fc51264f | 4225 | gold::relocate_for_relocatable<size, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
4226 | relinfo, |
4227 | prelocs, | |
4228 | reloc_count, | |
4229 | output_section, | |
4230 | offset_in_output_section, | |
4231 | rr, | |
4232 | view, | |
4233 | view_address, | |
4234 | view_size, | |
4235 | reloc_view, | |
4236 | reloc_view_size); | |
4237 | } | |
4238 | ||
4fb6c25d ILT |
4239 | // Return the value to use for a dynamic which requires special |
4240 | // treatment. This is how we support equality comparisons of function | |
4241 | // pointers across shared library boundaries, as described in the | |
4242 | // processor specific ABI supplement. | |
4243 | ||
fc51264f | 4244 | template<int size> |
4fb6c25d | 4245 | uint64_t |
fc51264f | 4246 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
4247 | { |
4248 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
67181c72 | 4249 | return this->plt_address_for_global(gsym) + gsym->plt_offset(); |
4fb6c25d ILT |
4250 | } |
4251 | ||
2e30d253 ILT |
4252 | // Return a string used to fill a code section with nops to take up |
4253 | // the specified length. | |
4254 | ||
fc51264f | 4255 | template<int size> |
2e30d253 | 4256 | std::string |
fc51264f | 4257 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
4258 | { |
4259 | if (length >= 16) | |
4260 | { | |
4261 | // Build a jmpq instruction to skip over the bytes. | |
4262 | unsigned char jmp[5]; | |
4263 | jmp[0] = 0xe9; | |
04bf7072 | 4264 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 | 4265 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
2e702c99 | 4266 | + std::string(length - 5, static_cast<char>(0x90))); |
2e30d253 ILT |
4267 | } |
4268 | ||
4269 | // Nop sequences of various lengths. | |
76677ad0 CC |
4270 | const char nop1[1] = { '\x90' }; // nop |
4271 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
4272 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
4273 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
2e702c99 | 4274 | '\x00'}; |
76677ad0 CC |
4275 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) |
4276 | '\x00', '\x00' }; | |
4277 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
2e702c99 | 4278 | '\x44', '\x00', '\x00' }; |
76677ad0 | 4279 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) |
2e702c99 | 4280 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4281 | '\x00' }; |
4282 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
2e702c99 | 4283 | '\x00', '\x00', '\x00', |
76677ad0 CC |
4284 | '\x00', '\x00' }; |
4285 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
2e702c99 | 4286 | '\x84', '\x00', '\x00', |
76677ad0 CC |
4287 | '\x00', '\x00', '\x00' }; |
4288 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
2e702c99 | 4289 | '\x1f', '\x84', '\x00', |
76677ad0 CC |
4290 | '\x00', '\x00', '\x00', |
4291 | '\x00' }; | |
4292 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
2e702c99 | 4293 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4294 | '\x00', '\x00', '\x00', |
4295 | '\x00', '\x00' }; | |
4296 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
2e702c99 | 4297 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4298 | '\x84', '\x00', '\x00', |
4299 | '\x00', '\x00', '\x00' }; | |
4300 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
2e702c99 | 4301 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) |
76677ad0 CC |
4302 | '\x1f', '\x84', '\x00', |
4303 | '\x00', '\x00', '\x00', | |
2e702c99 | 4304 | '\x00' }; |
76677ad0 | 4305 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4306 | '\x66', '\x66', '\x2e', // data16 |
76677ad0 CC |
4307 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) |
4308 | '\x00', '\x00', '\x00', | |
2e702c99 | 4309 | '\x00', '\x00' }; |
76677ad0 | 4310 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 |
2e702c99 | 4311 | '\x66', '\x66', '\x66', // data16; data16 |
76677ad0 CC |
4312 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) |
4313 | '\x84', '\x00', '\x00', | |
2e702c99 | 4314 | '\x00', '\x00', '\x00' }; |
2e30d253 ILT |
4315 | |
4316 | const char* nops[16] = { | |
4317 | NULL, | |
4318 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
4319 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
4320 | }; | |
4321 | ||
4322 | return std::string(nops[length], length); | |
4323 | } | |
4324 | ||
e291e7b9 ILT |
4325 | // Return the addend to use for a target specific relocation. The |
4326 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
4327 | // symbol. We want to set the addend is the offset of the local | |
4328 | // symbol in the TLS segment. | |
4329 | ||
fc51264f | 4330 | template<int size> |
e291e7b9 | 4331 | uint64_t |
fc51264f L |
4332 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
4333 | uint64_t) const | |
e291e7b9 ILT |
4334 | { |
4335 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
4336 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
4337 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
4338 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 4339 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
4340 | gold_assert(psymval->is_tls_symbol()); |
4341 | // The value of a TLS symbol is the offset in the TLS segment. | |
4342 | return psymval->value(ti.object, 0); | |
4343 | } | |
4344 | ||
02d7cd44 ILT |
4345 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
4346 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
4347 | // assembler can not write out the difference between two labels in | |
4348 | // different sections, so instead of using a pc-relative value they | |
4349 | // use an offset from the GOT. | |
4350 | ||
fc51264f | 4351 | template<int size> |
02d7cd44 | 4352 | uint64_t |
fc51264f | 4353 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
4354 | { |
4355 | gold_assert(this->global_offset_table_ != NULL); | |
4356 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 4357 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
4358 | return ssym->value(); |
4359 | } | |
4360 | ||
364c7fa5 | 4361 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 4362 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
4363 | // code. We have to change the function so that it always ensures |
4364 | // that it has enough stack space to run some random function. | |
4365 | ||
fc51264f | 4366 | template<int size> |
364c7fa5 | 4367 | void |
fc51264f L |
4368 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
4369 | section_offset_type fnoffset, | |
4370 | section_size_type fnsize, | |
4371 | unsigned char* view, | |
4372 | section_size_type view_size, | |
4373 | std::string* from, | |
4374 | std::string* to) const | |
364c7fa5 ILT |
4375 | { |
4376 | // The function starts with a comparison of the stack pointer and a | |
4377 | // field in the TCB. This is followed by a jump. | |
4378 | ||
4379 | // cmp %fs:NN,%rsp | |
4380 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
4381 | && fnsize > 9) | |
4382 | { | |
4383 | // We will call __morestack if the carry flag is set after this | |
4384 | // comparison. We turn the comparison into an stc instruction | |
4385 | // and some nops. | |
4386 | view[fnoffset] = '\xf9'; | |
4387 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
4388 | } | |
4389 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
4390 | // lea NN(%rsp),%r11 |
4391 | else if ((this->match_view(view, view_size, fnoffset, | |
4392 | "\x4c\x8d\x94\x24", 4) | |
4393 | || this->match_view(view, view_size, fnoffset, | |
4394 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
4395 | && fnsize > 8) |
4396 | { | |
4397 | // This is loading an offset from the stack pointer for a | |
4398 | // comparison. The offset is negative, so we decrease the | |
4399 | // offset by the amount of space we need for the stack. This | |
4400 | // means we will avoid calling __morestack if there happens to | |
4401 | // be plenty of space on the stack already. | |
4402 | unsigned char* pval = view + fnoffset + 4; | |
4403 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
4404 | val -= parameters->options().split_stack_adjust_size(); | |
4405 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
4406 | } | |
4407 | else | |
4408 | { | |
4409 | if (!object->has_no_split_stack()) | |
4410 | object->error(_("failed to match split-stack sequence at " | |
4411 | "section %u offset %0zx"), | |
ac33a407 | 4412 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
4413 | return; |
4414 | } | |
4415 | ||
4416 | // We have to change the function so that it calls | |
4417 | // __morestack_non_split instead of __morestack. The former will | |
4418 | // allocate additional stack space. | |
4419 | *from = "__morestack"; | |
4420 | *to = "__morestack_non_split"; | |
4421 | } | |
4422 | ||
2e702c99 RM |
4423 | // The selector for x86_64 object files. Note this is never instantiated |
4424 | // directly. It's only used in Target_selector_x86_64_nacl, below. | |
2e30d253 | 4425 | |
fc51264f | 4426 | template<int size> |
36959681 | 4427 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
4428 | { |
4429 | public: | |
4430 | Target_selector_x86_64() | |
fc51264f | 4431 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
2e702c99 | 4432 | (size == 64 |
fc51264f | 4433 | ? "elf64-x86-64" : "elf32-x86-64"), |
2e702c99 | 4434 | (size == 64 |
fc51264f L |
4435 | ? "elf64-x86-64-freebsd" |
4436 | : "elf32-x86-64-freebsd"), | |
4437 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
4438 | { } |
4439 | ||
4440 | Target* | |
e96caa79 | 4441 | do_instantiate_target() |
fc51264f | 4442 | { return new Target_x86_64<size>(); } |
36959681 | 4443 | |
2e30d253 ILT |
4444 | }; |
4445 | ||
2e702c99 RM |
4446 | // NaCl variant. It uses different PLT contents. |
4447 | ||
4448 | template<int size> | |
4449 | class Output_data_plt_x86_64_nacl : public Output_data_plt_x86_64<size> | |
4450 | { | |
4451 | public: | |
4452 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4453 | Output_data_got<64, false>* got, | |
4454 | Output_data_space* got_plt, | |
4455 | Output_data_space* got_irelative) | |
4456 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4457 | got, got_plt, got_irelative) | |
4458 | { } | |
4459 | ||
4460 | Output_data_plt_x86_64_nacl(Layout* layout, | |
4461 | Output_data_got<64, false>* got, | |
4462 | Output_data_space* got_plt, | |
4463 | Output_data_space* got_irelative, | |
4464 | unsigned int plt_count) | |
4465 | : Output_data_plt_x86_64<size>(layout, plt_entry_size, | |
4466 | got, got_plt, got_irelative, | |
4467 | plt_count) | |
4468 | { } | |
4469 | ||
4470 | protected: | |
4471 | virtual unsigned int | |
4472 | do_get_plt_entry_size() const | |
4473 | { return plt_entry_size; } | |
4474 | ||
4475 | virtual void | |
4476 | do_add_eh_frame(Layout* layout) | |
4477 | { | |
4478 | layout->add_eh_frame_for_plt(this, | |
4479 | this->plt_eh_frame_cie, | |
4480 | this->plt_eh_frame_cie_size, | |
4481 | plt_eh_frame_fde, | |
4482 | plt_eh_frame_fde_size); | |
4483 | } | |
4484 | ||
4485 | virtual void | |
4486 | do_fill_first_plt_entry(unsigned char* pov, | |
4487 | typename elfcpp::Elf_types<size>::Elf_Addr got_addr, | |
4488 | typename elfcpp::Elf_types<size>::Elf_Addr plt_addr); | |
4489 | ||
4490 | virtual unsigned int | |
4491 | do_fill_plt_entry(unsigned char* pov, | |
4492 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4493 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4494 | unsigned int got_offset, | |
4495 | unsigned int plt_offset, | |
4496 | unsigned int plt_index); | |
4497 | ||
4498 | virtual void | |
4499 | do_fill_tlsdesc_entry(unsigned char* pov, | |
4500 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4501 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4502 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4503 | unsigned int tlsdesc_got_offset, | |
4504 | unsigned int plt_offset); | |
4505 | ||
4506 | private: | |
4507 | // The size of an entry in the PLT. | |
4508 | static const int plt_entry_size = 64; | |
4509 | ||
4510 | // The first entry in the PLT. | |
4511 | static const unsigned char first_plt_entry[plt_entry_size]; | |
4512 | ||
4513 | // Other entries in the PLT for an executable. | |
4514 | static const unsigned char plt_entry[plt_entry_size]; | |
4515 | ||
4516 | // The reserved TLSDESC entry in the PLT for an executable. | |
4517 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; | |
4518 | ||
4519 | // The .eh_frame unwind information for the PLT. | |
4520 | static const int plt_eh_frame_fde_size = 32; | |
4521 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
4522 | }; | |
4523 | ||
4524 | template<int size> | |
4525 | class Target_x86_64_nacl : public Target_x86_64<size> | |
4526 | { | |
4527 | public: | |
4528 | Target_x86_64_nacl() | |
4529 | : Target_x86_64<size>(&x86_64_nacl_info) | |
4530 | { } | |
4531 | ||
4532 | virtual Output_data_plt_x86_64<size>* | |
4533 | do_make_data_plt(Layout* layout, | |
4534 | Output_data_got<64, false>* got, | |
4535 | Output_data_space* got_plt, | |
4536 | Output_data_space* got_irelative) | |
4537 | { | |
4538 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4539 | got_irelative); | |
4540 | } | |
4541 | ||
4542 | virtual Output_data_plt_x86_64<size>* | |
4543 | do_make_data_plt(Layout* layout, | |
4544 | Output_data_got<64, false>* got, | |
4545 | Output_data_space* got_plt, | |
4546 | Output_data_space* got_irelative, | |
4547 | unsigned int plt_count) | |
4548 | { | |
4549 | return new Output_data_plt_x86_64_nacl<size>(layout, got, got_plt, | |
4550 | got_irelative, | |
4551 | plt_count); | |
4552 | } | |
4553 | ||
4554 | private: | |
4555 | static const Target::Target_info x86_64_nacl_info; | |
4556 | }; | |
4557 | ||
4558 | template<> | |
4559 | const Target::Target_info Target_x86_64_nacl<64>::x86_64_nacl_info = | |
4560 | { | |
4561 | 64, // size | |
4562 | false, // is_big_endian | |
4563 | elfcpp::EM_X86_64, // machine_code | |
4564 | false, // has_make_symbol | |
4565 | false, // has_resolve | |
4566 | true, // has_code_fill | |
4567 | true, // is_default_stack_executable | |
4568 | true, // can_icf_inline_merge_sections | |
4569 | '\0', // wrap_char | |
4570 | "/lib64/ld-nacl-x86-64.so.1", // dynamic_linker | |
4571 | 0x20000, // default_text_segment_address | |
4572 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4573 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4574 | true, // isolate_execinstr | |
4575 | 0x10000000, // rosegment_gap | |
4576 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4577 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4578 | 0, // small_common_section_flags | |
4579 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4580 | NULL, // attributes_section | |
4581 | NULL // attributes_vendor | |
4582 | }; | |
4583 | ||
4584 | template<> | |
4585 | const Target::Target_info Target_x86_64_nacl<32>::x86_64_nacl_info = | |
4586 | { | |
4587 | 32, // size | |
4588 | false, // is_big_endian | |
4589 | elfcpp::EM_X86_64, // machine_code | |
4590 | false, // has_make_symbol | |
4591 | false, // has_resolve | |
4592 | true, // has_code_fill | |
4593 | true, // is_default_stack_executable | |
4594 | true, // can_icf_inline_merge_sections | |
4595 | '\0', // wrap_char | |
4596 | "/lib/ld-nacl-x86-64.so.1", // dynamic_linker | |
4597 | 0x20000, // default_text_segment_address | |
4598 | 0x10000, // abi_pagesize (overridable by -z max-page-size) | |
4599 | 0x10000, // common_pagesize (overridable by -z common-page-size) | |
4600 | true, // isolate_execinstr | |
4601 | 0x10000000, // rosegment_gap | |
4602 | elfcpp::SHN_UNDEF, // small_common_shndx | |
4603 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
4604 | 0, // small_common_section_flags | |
4605 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
4606 | NULL, // attributes_section | |
4607 | NULL // attributes_vendor | |
4608 | }; | |
4609 | ||
4610 | #define NACLMASK 0xe0 // 32-byte alignment mask. | |
4611 | ||
4612 | // The first entry in the PLT. | |
4613 | ||
4614 | template<int size> | |
4615 | const unsigned char | |
4616 | Output_data_plt_x86_64_nacl<size>::first_plt_entry[plt_entry_size] = | |
4617 | { | |
4618 | 0xff, 0x35, // pushq contents of memory address | |
4619 | 0, 0, 0, 0, // replaced with address of .got + 8 | |
4620 | 0x4c, 0x8b, 0x1d, // mov GOT+16(%rip), %r11 | |
4621 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
4622 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4623 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4624 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4625 | ||
4626 | // 9-byte nop sequence to pad out to the next 32-byte boundary. | |
4627 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopl %cs:0x0(%rax,%rax,1) | |
4628 | ||
4629 | // 32 bytes of nop to pad out to the standard size | |
4630 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4631 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4632 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4633 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4634 | 0x66, // excess data32 prefix | |
4635 | 0x90 // nop | |
4636 | }; | |
4637 | ||
4638 | template<int size> | |
4639 | void | |
4640 | Output_data_plt_x86_64_nacl<size>::do_fill_first_plt_entry( | |
4641 | unsigned char* pov, | |
4642 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4643 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address) | |
4644 | { | |
4645 | memcpy(pov, first_plt_entry, plt_entry_size); | |
4646 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4647 | (got_address + 8 | |
4648 | - (plt_address + 2 + 4))); | |
4649 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4650 | (got_address + 16 | |
4651 | - (plt_address + 9 + 4))); | |
4652 | } | |
4653 | ||
4654 | // Subsequent entries in the PLT. | |
4655 | ||
4656 | template<int size> | |
4657 | const unsigned char | |
4658 | Output_data_plt_x86_64_nacl<size>::plt_entry[plt_entry_size] = | |
4659 | { | |
4660 | 0x4c, 0x8b, 0x1d, // mov name@GOTPCREL(%rip),%r11 | |
4661 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
4662 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4663 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4664 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4665 | ||
4666 | // 15-byte nop sequence to pad out to the next 32-byte boundary. | |
4667 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4668 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4669 | ||
4670 | // Lazy GOT entries point here (32-byte aligned). | |
4671 | 0x68, // pushq immediate | |
4672 | 0, 0, 0, 0, // replaced with index into relocation table | |
4673 | 0xe9, // jmp relative | |
4674 | 0, 0, 0, 0, // replaced with offset to start of .plt0 | |
4675 | ||
4676 | // 22 bytes of nop to pad out to the standard size. | |
4677 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4678 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4679 | 0x0f, 0x1f, 0x80, 0, 0, 0, 0, // nopl 0x0(%rax) | |
4680 | }; | |
4681 | ||
4682 | template<int size> | |
4683 | unsigned int | |
4684 | Output_data_plt_x86_64_nacl<size>::do_fill_plt_entry( | |
4685 | unsigned char* pov, | |
4686 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4687 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4688 | unsigned int got_offset, | |
4689 | unsigned int plt_offset, | |
4690 | unsigned int plt_index) | |
4691 | { | |
4692 | memcpy(pov, plt_entry, plt_entry_size); | |
4693 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 3, | |
4694 | (got_address + got_offset | |
4695 | - (plt_address + plt_offset | |
4696 | + 3 + 4))); | |
4697 | ||
4698 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 33, plt_index); | |
4699 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 38, | |
4700 | - (plt_offset + 38 + 4)); | |
4701 | ||
4702 | return 32; | |
4703 | } | |
4704 | ||
4705 | // The reserved TLSDESC entry in the PLT. | |
4706 | ||
4707 | template<int size> | |
4708 | const unsigned char | |
4709 | Output_data_plt_x86_64_nacl<size>::tlsdesc_plt_entry[plt_entry_size] = | |
4710 | { | |
4711 | 0xff, 0x35, // pushq x(%rip) | |
4712 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
4713 | 0x4c, 0x8b, 0x1d, // mov y(%rip),%r11 | |
4714 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
4715 | 0x41, 0x83, 0xe3, NACLMASK, // and $-32, %r11d | |
4716 | 0x4d, 0x01, 0xfb, // add %r15, %r11 | |
4717 | 0x41, 0xff, 0xe3, // jmpq *%r11 | |
4718 | ||
4719 | // 41 bytes of nop to pad out to the standard size. | |
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 | 0x66, 0x66, 0x66, 0x66, 0x66, 0x66, // excess data32 prefixes | |
4723 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4724 | 0x66, 0x66, // excess data32 prefixes | |
4725 | 0x2e, 0x0f, 0x1f, 0x84, 0, 0, 0, 0, 0, // nopw %cs:0x0(%rax,%rax,1) | |
4726 | }; | |
4727 | ||
4728 | template<int size> | |
4729 | void | |
4730 | Output_data_plt_x86_64_nacl<size>::do_fill_tlsdesc_entry( | |
4731 | unsigned char* pov, | |
4732 | typename elfcpp::Elf_types<size>::Elf_Addr got_address, | |
4733 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address, | |
4734 | typename elfcpp::Elf_types<size>::Elf_Addr got_base, | |
4735 | unsigned int tlsdesc_got_offset, | |
4736 | unsigned int plt_offset) | |
4737 | { | |
4738 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
4739 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
4740 | (got_address + 8 | |
4741 | - (plt_address + plt_offset | |
4742 | + 2 + 4))); | |
4743 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 9, | |
4744 | (got_base | |
4745 | + tlsdesc_got_offset | |
4746 | - (plt_address + plt_offset | |
4747 | + 9 + 4))); | |
4748 | } | |
4749 | ||
4750 | // The .eh_frame unwind information for the PLT. | |
4751 | ||
4752 | template<int size> | |
4753 | const unsigned char | |
4754 | Output_data_plt_x86_64_nacl<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = | |
4755 | { | |
4756 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
4757 | 0, 0, 0, 0, // Replaced with size of .plt. | |
4758 | 0, // Augmentation size. | |
4759 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
4760 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
4761 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
4762 | elfcpp::DW_CFA_advance_loc + 58, // Advance 58 to __PLT__ + 64. | |
4763 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
4764 | 13, // Block length. | |
4765 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
4766 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
4767 | elfcpp::DW_OP_const1u, 63, // Push 0x3f. | |
4768 | elfcpp::DW_OP_and, // & (%rip & 0x3f). | |
4769 | elfcpp::DW_OP_const1u, 37, // Push 0x25. | |
4770 | elfcpp::DW_OP_ge, // >= ((%rip & 0x3f) >= 0x25) | |
4771 | elfcpp::DW_OP_lit3, // Push 3. | |
4772 | elfcpp::DW_OP_shl, // << (((%rip & 0x3f) >= 0x25) << 3) | |
4773 | elfcpp::DW_OP_plus, // + ((((%rip&0x3f)>=0x25)<<3)+%rsp+8 | |
4774 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
4775 | elfcpp::DW_CFA_nop | |
4776 | }; | |
4777 | ||
4778 | // The selector for x86_64-nacl object files. | |
4779 | ||
4780 | template<int size> | |
4781 | class Target_selector_x86_64_nacl | |
4782 | : public Target_selector_nacl<Target_selector_x86_64<size>, | |
4783 | Target_x86_64_nacl<size> > | |
4784 | { | |
4785 | public: | |
4786 | Target_selector_x86_64_nacl() | |
4787 | : Target_selector_nacl<Target_selector_x86_64<size>, | |
4788 | Target_x86_64_nacl<size> >("x86-64", | |
4789 | size == 64 | |
4790 | ? "elf64-x86-64-nacl" | |
4791 | : "elf32-x86-64-nacl", | |
4792 | size == 64 | |
4793 | ? "elf_x86_64_nacl" | |
4794 | : "elf32_x86_64_nacl") | |
4795 | { } | |
4796 | }; | |
4797 | ||
4798 | Target_selector_x86_64_nacl<64> target_selector_x86_64; | |
4799 | Target_selector_x86_64_nacl<32> target_selector_x32; | |
2e30d253 ILT |
4800 | |
4801 | } // End anonymous namespace. |