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2e30d253 ILT |
1 | // x86_64.cc -- x86_64 target support for gold. |
2 | ||
b3ce541e | 3 | // Copyright 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
2e30d253 ILT |
4 | // Written by Ian Lance Taylor <iant@google.com>. |
5 | ||
6 | // This file is part of gold. | |
7 | ||
8b105e34 ILT |
8 | // This program is free software; you can redistribute it and/or modify |
9 | // it under the terms of the GNU General Public License as published by | |
10 | // the Free Software Foundation; either version 3 of the License, or | |
2e30d253 ILT |
11 | // (at your option) any later version. |
12 | ||
8b105e34 ILT |
13 | // This program is distributed in the hope that it will be useful, |
14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | // GNU General Public License for more details. | |
17 | ||
18 | // You should have received a copy of the GNU General Public License | |
19 | // along with this program; if not, write to the Free Software | |
20 | // Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
21 | // MA 02110-1301, USA. | |
2e30d253 ILT |
22 | |
23 | #include "gold.h" | |
24 | ||
25 | #include <cstring> | |
26 | ||
27 | #include "elfcpp.h" | |
07a60597 | 28 | #include "dwarf.h" |
2e30d253 ILT |
29 | #include "parameters.h" |
30 | #include "reloc.h" | |
31 | #include "x86_64.h" | |
32 | #include "object.h" | |
33 | #include "symtab.h" | |
34 | #include "layout.h" | |
35 | #include "output.h" | |
12c0daef | 36 | #include "copy-relocs.h" |
2e30d253 ILT |
37 | #include "target.h" |
38 | #include "target-reloc.h" | |
39 | #include "target-select.h" | |
e041f13d | 40 | #include "tls.h" |
36959681 | 41 | #include "freebsd.h" |
f345227a | 42 | #include "gc.h" |
21bb3914 | 43 | #include "icf.h" |
2e30d253 ILT |
44 | |
45 | namespace | |
46 | { | |
47 | ||
48 | using namespace gold; | |
49 | ||
7223e9ca ILT |
50 | // A class to handle the PLT data. |
51 | ||
fc51264f | 52 | template<int size> |
7223e9ca ILT |
53 | class Output_data_plt_x86_64 : public Output_section_data |
54 | { | |
55 | public: | |
fc51264f | 56 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
7223e9ca | 57 | |
67181c72 | 58 | Output_data_plt_x86_64(Layout* layout, Output_data_got<64, false>* got, |
4829d394 | 59 | Output_data_space* got_plt, |
67181c72 | 60 | Output_data_space* got_irelative) |
7d172687 ILT |
61 | : Output_section_data(16), layout_(layout), tlsdesc_rel_(NULL), |
62 | irelative_rel_(NULL), got_(got), got_plt_(got_plt), | |
63 | got_irelative_(got_irelative), count_(0), irelative_count_(0), | |
64 | tlsdesc_got_offset_(-1U), free_list_() | |
67181c72 ILT |
65 | { this->init(layout); } |
66 | ||
67 | Output_data_plt_x86_64(Layout* layout, Output_data_got<64, false>* got, | |
68 | Output_data_space* got_plt, | |
69 | Output_data_space* got_irelative, | |
4829d394 | 70 | unsigned int plt_count) |
07a60597 | 71 | : Output_section_data((plt_count + 1) * plt_entry_size, 16, false), |
7d172687 ILT |
72 | layout_(layout), tlsdesc_rel_(NULL), irelative_rel_(NULL), got_(got), |
73 | got_plt_(got_plt), got_irelative_(got_irelative), count_(plt_count), | |
74 | irelative_count_(0), tlsdesc_got_offset_(-1U), free_list_() | |
4829d394 | 75 | { |
67181c72 | 76 | this->init(layout); |
4829d394 CC |
77 | |
78 | // Initialize the free list and reserve the first entry. | |
79 | this->free_list_.init((plt_count + 1) * plt_entry_size, false); | |
80 | this->free_list_.remove(0, plt_entry_size); | |
81 | } | |
82 | ||
83 | // Initialize the PLT section. | |
84 | void | |
67181c72 | 85 | init(Layout* layout); |
7223e9ca ILT |
86 | |
87 | // Add an entry to the PLT. | |
88 | void | |
67181c72 | 89 | add_entry(Symbol_table*, Layout*, Symbol* gsym); |
7223e9ca ILT |
90 | |
91 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. | |
92 | unsigned int | |
67181c72 | 93 | add_local_ifunc_entry(Symbol_table* symtab, Layout*, |
fc51264f | 94 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
95 | unsigned int local_sym_index); |
96 | ||
4829d394 CC |
97 | // Add the relocation for a PLT entry. |
98 | void | |
67181c72 ILT |
99 | add_relocation(Symbol_table*, Layout*, Symbol* gsym, |
100 | unsigned int got_offset); | |
4829d394 | 101 | |
7223e9ca ILT |
102 | // Add the reserved TLSDESC_PLT entry to the PLT. |
103 | void | |
104 | reserve_tlsdesc_entry(unsigned int got_offset) | |
105 | { this->tlsdesc_got_offset_ = got_offset; } | |
106 | ||
107 | // Return true if a TLSDESC_PLT entry has been reserved. | |
108 | bool | |
109 | has_tlsdesc_entry() const | |
110 | { return this->tlsdesc_got_offset_ != -1U; } | |
111 | ||
112 | // Return the GOT offset for the reserved TLSDESC_PLT entry. | |
113 | unsigned int | |
114 | get_tlsdesc_got_offset() const | |
115 | { return this->tlsdesc_got_offset_; } | |
116 | ||
117 | // Return the offset of the reserved TLSDESC_PLT entry. | |
118 | unsigned int | |
119 | get_tlsdesc_plt_offset() const | |
67181c72 | 120 | { return (this->count_ + this->irelative_count_ + 1) * plt_entry_size; } |
7223e9ca ILT |
121 | |
122 | // Return the .rela.plt section data. | |
123 | Reloc_section* | |
124 | rela_plt() | |
125 | { return this->rel_; } | |
126 | ||
127 | // Return where the TLSDESC relocations should go. | |
128 | Reloc_section* | |
129 | rela_tlsdesc(Layout*); | |
130 | ||
67181c72 ILT |
131 | // Return where the IRELATIVE relocations should go in the PLT |
132 | // relocations. | |
133 | Reloc_section* | |
134 | rela_irelative(Symbol_table*, Layout*); | |
135 | ||
136 | // Return whether we created a section for IRELATIVE relocations. | |
137 | bool | |
138 | has_irelative_section() const | |
139 | { return this->irelative_rel_ != NULL; } | |
140 | ||
7223e9ca ILT |
141 | // Return the number of PLT entries. |
142 | unsigned int | |
143 | entry_count() const | |
67181c72 | 144 | { return this->count_ + this->irelative_count_; } |
7223e9ca ILT |
145 | |
146 | // Return the offset of the first non-reserved PLT entry. | |
147 | static unsigned int | |
148 | first_plt_entry_offset() | |
149 | { return plt_entry_size; } | |
150 | ||
151 | // Return the size of a PLT entry. | |
152 | static unsigned int | |
153 | get_plt_entry_size() | |
154 | { return plt_entry_size; } | |
155 | ||
4829d394 CC |
156 | // Reserve a slot in the PLT for an existing symbol in an incremental update. |
157 | void | |
158 | reserve_slot(unsigned int plt_index) | |
159 | { | |
160 | this->free_list_.remove((plt_index + 1) * plt_entry_size, | |
161 | (plt_index + 2) * plt_entry_size); | |
162 | } | |
163 | ||
67181c72 ILT |
164 | // Return the PLT address to use for a global symbol. |
165 | uint64_t | |
166 | address_for_global(const Symbol*); | |
167 | ||
168 | // Return the PLT address to use for a local symbol. | |
169 | uint64_t | |
170 | address_for_local(const Relobj*, unsigned int symndx); | |
171 | ||
7223e9ca ILT |
172 | protected: |
173 | void | |
174 | do_adjust_output_section(Output_section* os); | |
175 | ||
176 | // Write to a map file. | |
177 | void | |
178 | do_print_to_mapfile(Mapfile* mapfile) const | |
179 | { mapfile->print_output_data(this, _("** PLT")); } | |
180 | ||
181 | private: | |
182 | // The size of an entry in the PLT. | |
183 | static const int plt_entry_size = 16; | |
184 | ||
185 | // The first entry in the PLT. | |
186 | // From the AMD64 ABI: "Unlike Intel386 ABI, this ABI uses the same | |
187 | // procedure linkage table for both programs and shared objects." | |
07a60597 | 188 | static const unsigned char first_plt_entry[plt_entry_size]; |
7223e9ca ILT |
189 | |
190 | // Other entries in the PLT for an executable. | |
07a60597 | 191 | static const unsigned char plt_entry[plt_entry_size]; |
7223e9ca ILT |
192 | |
193 | // The reserved TLSDESC entry in the PLT for an executable. | |
07a60597 ILT |
194 | static const unsigned char tlsdesc_plt_entry[plt_entry_size]; |
195 | ||
196 | // The .eh_frame unwind information for the PLT. | |
197 | static const int plt_eh_frame_cie_size = 16; | |
198 | static const int plt_eh_frame_fde_size = 32; | |
199 | static const unsigned char plt_eh_frame_cie[plt_eh_frame_cie_size]; | |
200 | static const unsigned char plt_eh_frame_fde[plt_eh_frame_fde_size]; | |
7223e9ca ILT |
201 | |
202 | // Set the final size. | |
203 | void | |
204 | set_final_data_size(); | |
205 | ||
206 | // Write out the PLT data. | |
207 | void | |
208 | do_write(Output_file*); | |
209 | ||
7d172687 ILT |
210 | // A pointer to the Layout class, so that we can find the .dynamic |
211 | // section when we write out the GOT PLT section. | |
212 | Layout* layout_; | |
7223e9ca ILT |
213 | // The reloc section. |
214 | Reloc_section* rel_; | |
215 | // The TLSDESC relocs, if necessary. These must follow the regular | |
216 | // PLT relocs. | |
217 | Reloc_section* tlsdesc_rel_; | |
67181c72 ILT |
218 | // The IRELATIVE relocs, if necessary. These must follow the |
219 | // regular PLT relocations and the TLSDESC relocations. | |
220 | Reloc_section* irelative_rel_; | |
7223e9ca ILT |
221 | // The .got section. |
222 | Output_data_got<64, false>* got_; | |
223 | // The .got.plt section. | |
224 | Output_data_space* got_plt_; | |
67181c72 ILT |
225 | // The part of the .got.plt section used for IRELATIVE relocs. |
226 | Output_data_space* got_irelative_; | |
7223e9ca ILT |
227 | // The number of PLT entries. |
228 | unsigned int count_; | |
67181c72 ILT |
229 | // Number of PLT entries with R_X86_64_IRELATIVE relocs. These |
230 | // follow the regular PLT entries. | |
231 | unsigned int irelative_count_; | |
7223e9ca ILT |
232 | // Offset of the reserved TLSDESC_GOT entry when needed. |
233 | unsigned int tlsdesc_got_offset_; | |
4829d394 CC |
234 | // List of available regions within the section, for incremental |
235 | // update links. | |
236 | Free_list free_list_; | |
7223e9ca | 237 | }; |
2e30d253 ILT |
238 | |
239 | // The x86_64 target class. | |
d61c17ea ILT |
240 | // See the ABI at |
241 | // http://www.x86-64.org/documentation/abi.pdf | |
242 | // TLS info comes from | |
243 | // http://people.redhat.com/drepper/tls.pdf | |
0ffd9845 | 244 | // http://www.lsd.ic.unicamp.br/~oliva/writeups/TLS/RFC-TLSDESC-x86.txt |
2e30d253 | 245 | |
fc51264f L |
246 | template<int size> |
247 | class Target_x86_64 : public Sized_target<size, false> | |
2e30d253 ILT |
248 | { |
249 | public: | |
e822f2b1 ILT |
250 | // In the x86_64 ABI (p 68), it says "The AMD64 ABI architectures |
251 | // uses only Elf64_Rela relocation entries with explicit addends." | |
fc51264f | 252 | typedef Output_data_reloc<elfcpp::SHT_RELA, true, size, false> Reloc_section; |
2e30d253 ILT |
253 | |
254 | Target_x86_64() | |
fc51264f | 255 | : Sized_target<size, false>(&x86_64_info), |
67181c72 ILT |
256 | got_(NULL), plt_(NULL), got_plt_(NULL), got_irelative_(NULL), |
257 | got_tlsdesc_(NULL), global_offset_table_(NULL), rela_dyn_(NULL), | |
258 | rela_irelative_(NULL), copy_relocs_(elfcpp::R_X86_64_COPY), | |
259 | dynbss_(NULL), got_mod_index_offset_(-1U), tlsdesc_reloc_info_(), | |
e291e7b9 | 260 | tls_base_symbol_defined_(false) |
2e30d253 ILT |
261 | { } |
262 | ||
8a5e3e08 ILT |
263 | // Hook for a new output section. |
264 | void | |
265 | do_new_output_section(Output_section*) const; | |
266 | ||
6d03d481 ST |
267 | // Scan the relocations to look for symbol adjustments. |
268 | void | |
ad0f2072 | 269 | gc_process_relocs(Symbol_table* symtab, |
6d03d481 | 270 | Layout* layout, |
fc51264f | 271 | Sized_relobj_file<size, false>* object, |
6d03d481 ST |
272 | unsigned int data_shndx, |
273 | unsigned int sh_type, | |
274 | const unsigned char* prelocs, | |
275 | size_t reloc_count, | |
276 | Output_section* output_section, | |
277 | bool needs_special_offset_handling, | |
278 | size_t local_symbol_count, | |
279 | const unsigned char* plocal_symbols); | |
280 | ||
2e30d253 ILT |
281 | // Scan the relocations to look for symbol adjustments. |
282 | void | |
ad0f2072 | 283 | scan_relocs(Symbol_table* symtab, |
2e30d253 | 284 | Layout* layout, |
fc51264f | 285 | Sized_relobj_file<size, false>* object, |
2e30d253 ILT |
286 | unsigned int data_shndx, |
287 | unsigned int sh_type, | |
288 | const unsigned char* prelocs, | |
289 | size_t reloc_count, | |
730cdc88 ILT |
290 | Output_section* output_section, |
291 | bool needs_special_offset_handling, | |
2e30d253 | 292 | size_t local_symbol_count, |
730cdc88 | 293 | const unsigned char* plocal_symbols); |
2e30d253 ILT |
294 | |
295 | // Finalize the sections. | |
296 | void | |
f59f41f3 | 297 | do_finalize_sections(Layout*, const Input_objects*, Symbol_table*); |
2e30d253 | 298 | |
4fb6c25d ILT |
299 | // Return the value to use for a dynamic which requires special |
300 | // treatment. | |
301 | uint64_t | |
302 | do_dynsym_value(const Symbol*) const; | |
303 | ||
2e30d253 ILT |
304 | // Relocate a section. |
305 | void | |
fc51264f | 306 | relocate_section(const Relocate_info<size, false>*, |
2e30d253 ILT |
307 | unsigned int sh_type, |
308 | const unsigned char* prelocs, | |
309 | size_t reloc_count, | |
730cdc88 ILT |
310 | Output_section* output_section, |
311 | bool needs_special_offset_handling, | |
2e30d253 | 312 | unsigned char* view, |
fc51264f | 313 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
364c7fa5 ILT |
314 | section_size_type view_size, |
315 | const Reloc_symbol_changes*); | |
2e30d253 | 316 | |
6a74a719 ILT |
317 | // Scan the relocs during a relocatable link. |
318 | void | |
ad0f2072 | 319 | scan_relocatable_relocs(Symbol_table* symtab, |
6a74a719 | 320 | Layout* layout, |
fc51264f | 321 | Sized_relobj_file<size, false>* object, |
6a74a719 ILT |
322 | unsigned int data_shndx, |
323 | unsigned int sh_type, | |
324 | const unsigned char* prelocs, | |
325 | size_t reloc_count, | |
326 | Output_section* output_section, | |
327 | bool needs_special_offset_handling, | |
328 | size_t local_symbol_count, | |
329 | const unsigned char* plocal_symbols, | |
330 | Relocatable_relocs*); | |
331 | ||
332 | // Relocate a section during a relocatable link. | |
333 | void | |
fc51264f L |
334 | relocate_for_relocatable( |
335 | const Relocate_info<size, false>*, | |
336 | unsigned int sh_type, | |
337 | const unsigned char* prelocs, | |
338 | size_t reloc_count, | |
339 | Output_section* output_section, | |
340 | off_t offset_in_output_section, | |
341 | const Relocatable_relocs*, | |
342 | unsigned char* view, | |
343 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, | |
344 | section_size_type view_size, | |
345 | unsigned char* reloc_view, | |
346 | section_size_type reloc_view_size); | |
6a74a719 | 347 | |
2e30d253 ILT |
348 | // Return a string used to fill a code section with nops. |
349 | std::string | |
8851ecca | 350 | do_code_fill(section_size_type length) const; |
2e30d253 | 351 | |
9a2d6984 ILT |
352 | // Return whether SYM is defined by the ABI. |
353 | bool | |
9c2d0ef9 | 354 | do_is_defined_by_abi(const Symbol* sym) const |
9a2d6984 ILT |
355 | { return strcmp(sym->name(), "__tls_get_addr") == 0; } |
356 | ||
e291e7b9 ILT |
357 | // Return the symbol index to use for a target specific relocation. |
358 | // The only target specific relocation is R_X86_64_TLSDESC for a | |
359 | // local symbol, which is an absolute reloc. | |
360 | unsigned int | |
361 | do_reloc_symbol_index(void*, unsigned int r_type) const | |
362 | { | |
363 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
364 | return 0; | |
365 | } | |
366 | ||
367 | // Return the addend to use for a target specific relocation. | |
368 | uint64_t | |
369 | do_reloc_addend(void* arg, unsigned int r_type, uint64_t addend) const; | |
370 | ||
7223e9ca | 371 | // Return the PLT section. |
67181c72 ILT |
372 | uint64_t |
373 | do_plt_address_for_global(const Symbol* gsym) const | |
374 | { return this->plt_section()->address_for_global(gsym); } | |
7223e9ca | 375 | |
67181c72 ILT |
376 | uint64_t |
377 | do_plt_address_for_local(const Relobj* relobj, unsigned int symndx) const | |
378 | { return this->plt_section()->address_for_local(relobj, symndx); } | |
7223e9ca | 379 | |
b3ce541e ILT |
380 | // This function should be defined in targets that can use relocation |
381 | // types to determine (implemented in local_reloc_may_be_function_pointer | |
382 | // and global_reloc_may_be_function_pointer) | |
383 | // if a function's pointer is taken. ICF uses this in safe mode to only | |
384 | // fold those functions whose pointer is defintely not taken. For x86_64 | |
385 | // pie binaries, safe ICF cannot be done by looking at relocation types. | |
386 | bool | |
387 | do_can_check_for_function_pointers() const | |
388 | { return !parameters->options().pie(); } | |
389 | ||
02d7cd44 ILT |
390 | // Return the base for a DW_EH_PE_datarel encoding. |
391 | uint64_t | |
392 | do_ehframe_datarel_base() const; | |
393 | ||
9b547ce6 | 394 | // Adjust -fsplit-stack code which calls non-split-stack code. |
364c7fa5 ILT |
395 | void |
396 | do_calls_non_split(Relobj* object, unsigned int shndx, | |
397 | section_offset_type fnoffset, section_size_type fnsize, | |
398 | unsigned char* view, section_size_type view_size, | |
399 | std::string* from, std::string* to) const; | |
400 | ||
96f2030e | 401 | // Return the size of the GOT section. |
fe8718a4 | 402 | section_size_type |
0e70b911 | 403 | got_size() const |
96f2030e ILT |
404 | { |
405 | gold_assert(this->got_ != NULL); | |
406 | return this->got_->data_size(); | |
407 | } | |
408 | ||
0e70b911 CC |
409 | // Return the number of entries in the GOT. |
410 | unsigned int | |
411 | got_entry_count() const | |
412 | { | |
413 | if (this->got_ == NULL) | |
414 | return 0; | |
415 | return this->got_size() / 8; | |
416 | } | |
417 | ||
418 | // Return the number of entries in the PLT. | |
419 | unsigned int | |
420 | plt_entry_count() const; | |
421 | ||
422 | // Return the offset of the first non-reserved PLT entry. | |
423 | unsigned int | |
424 | first_plt_entry_offset() const; | |
425 | ||
426 | // Return the size of each PLT entry. | |
427 | unsigned int | |
428 | plt_entry_size() const; | |
429 | ||
4829d394 | 430 | // Create the GOT section for an incremental update. |
dd74ae06 | 431 | Output_data_got_base* |
4829d394 CC |
432 | init_got_plt_for_update(Symbol_table* symtab, |
433 | Layout* layout, | |
434 | unsigned int got_count, | |
435 | unsigned int plt_count); | |
436 | ||
6fa2a40b CC |
437 | // Reserve a GOT entry for a local symbol, and regenerate any |
438 | // necessary dynamic relocations. | |
439 | void | |
440 | reserve_local_got_entry(unsigned int got_index, | |
fc51264f | 441 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
442 | unsigned int r_sym, |
443 | unsigned int got_type); | |
444 | ||
445 | // Reserve a GOT entry for a global symbol, and regenerate any | |
446 | // necessary dynamic relocations. | |
447 | void | |
448 | reserve_global_got_entry(unsigned int got_index, Symbol* gsym, | |
449 | unsigned int got_type); | |
450 | ||
4829d394 | 451 | // Register an existing PLT entry for a global symbol. |
4829d394 | 452 | void |
67181c72 ILT |
453 | register_global_plt_entry(Symbol_table*, Layout*, unsigned int plt_index, |
454 | Symbol* gsym); | |
4829d394 | 455 | |
26d3c67d CC |
456 | // Force a COPY relocation for a given symbol. |
457 | void | |
458 | emit_copy_reloc(Symbol_table*, Symbol*, Output_section*, off_t); | |
459 | ||
94a3fc8b CC |
460 | // Apply an incremental relocation. |
461 | void | |
fc51264f L |
462 | apply_relocation(const Relocate_info<size, false>* relinfo, |
463 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 464 | unsigned int r_type, |
fc51264f | 465 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
466 | const Symbol* gsym, |
467 | unsigned char* view, | |
fc51264f | 468 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
469 | section_size_type view_size); |
470 | ||
e291e7b9 ILT |
471 | // Add a new reloc argument, returning the index in the vector. |
472 | size_t | |
fc51264f | 473 | add_tlsdesc_info(Sized_relobj_file<size, false>* object, unsigned int r_sym) |
e291e7b9 ILT |
474 | { |
475 | this->tlsdesc_reloc_info_.push_back(Tlsdesc_info(object, r_sym)); | |
476 | return this->tlsdesc_reloc_info_.size() - 1; | |
477 | } | |
478 | ||
2e30d253 ILT |
479 | private: |
480 | // The class which scans relocations. | |
a036edd8 | 481 | class Scan |
2e30d253 | 482 | { |
a036edd8 ILT |
483 | public: |
484 | Scan() | |
485 | : issued_non_pic_error_(false) | |
486 | { } | |
487 | ||
95a2c8d6 RS |
488 | static inline int |
489 | get_reference_flags(unsigned int r_type); | |
490 | ||
2e30d253 | 491 | inline void |
ad0f2072 | 492 | local(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 493 | Sized_relobj_file<size, false>* object, |
2e30d253 | 494 | unsigned int data_shndx, |
07f397ab | 495 | Output_section* output_section, |
fc51264f L |
496 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
497 | const elfcpp::Sym<size, false>& lsym); | |
2e30d253 ILT |
498 | |
499 | inline void | |
ad0f2072 | 500 | global(Symbol_table* symtab, Layout* layout, Target_x86_64* target, |
fc51264f | 501 | Sized_relobj_file<size, false>* object, |
2e30d253 | 502 | unsigned int data_shndx, |
07f397ab | 503 | Output_section* output_section, |
fc51264f | 504 | const elfcpp::Rela<size, false>& reloc, unsigned int r_type, |
2e30d253 | 505 | Symbol* gsym); |
e041f13d | 506 | |
21bb3914 ST |
507 | inline bool |
508 | local_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
509 | Target_x86_64* target, | |
fc51264f | 510 | Sized_relobj_file<size, false>* object, |
21bb3914 ST |
511 | unsigned int data_shndx, |
512 | Output_section* output_section, | |
fc51264f | 513 | const elfcpp::Rela<size, false>& reloc, |
21bb3914 | 514 | unsigned int r_type, |
fc51264f | 515 | const elfcpp::Sym<size, false>& lsym); |
21bb3914 ST |
516 | |
517 | inline bool | |
518 | global_reloc_may_be_function_pointer(Symbol_table* symtab, Layout* layout, | |
519 | Target_x86_64* target, | |
fc51264f | 520 | Sized_relobj_file<size, false>* object, |
21bb3914 ST |
521 | unsigned int data_shndx, |
522 | Output_section* output_section, | |
fc51264f | 523 | const elfcpp::Rela<size, false>& reloc, |
21bb3914 ST |
524 | unsigned int r_type, |
525 | Symbol* gsym); | |
526 | ||
a036edd8 | 527 | private: |
e041f13d | 528 | static void |
fc51264f L |
529 | unsupported_reloc_local(Sized_relobj_file<size, false>*, |
530 | unsigned int r_type); | |
e041f13d ILT |
531 | |
532 | static void | |
fc51264f L |
533 | unsupported_reloc_global(Sized_relobj_file<size, false>*, |
534 | unsigned int r_type, Symbol*); | |
a036edd8 ILT |
535 | |
536 | void | |
a29b0dad | 537 | check_non_pic(Relobj*, unsigned int r_type, Symbol*); |
a036edd8 | 538 | |
21bb3914 ST |
539 | inline bool |
540 | possible_function_pointer_reloc(unsigned int r_type); | |
541 | ||
7223e9ca | 542 | bool |
fc51264f | 543 | reloc_needs_plt_for_ifunc(Sized_relobj_file<size, false>*, |
6fa2a40b | 544 | unsigned int r_type); |
7223e9ca | 545 | |
a036edd8 ILT |
546 | // Whether we have issued an error about a non-PIC compilation. |
547 | bool issued_non_pic_error_; | |
2e30d253 ILT |
548 | }; |
549 | ||
550 | // The class which implements relocation. | |
551 | class Relocate | |
552 | { | |
553 | public: | |
554 | Relocate() | |
36171d64 | 555 | : skip_call_tls_get_addr_(false) |
2e30d253 ILT |
556 | { } |
557 | ||
558 | ~Relocate() | |
559 | { | |
560 | if (this->skip_call_tls_get_addr_) | |
561 | { | |
562 | // FIXME: This needs to specify the location somehow. | |
a0c4fb0a | 563 | gold_error(_("missing expected TLS relocation")); |
2e30d253 ILT |
564 | } |
565 | } | |
566 | ||
567 | // Do a relocation. Return false if the caller should not issue | |
568 | // any warnings about this relocation. | |
569 | inline bool | |
fc51264f L |
570 | relocate(const Relocate_info<size, false>*, Target_x86_64*, |
571 | Output_section*, | |
572 | size_t relnum, const elfcpp::Rela<size, false>&, | |
573 | unsigned int r_type, const Sized_symbol<size>*, | |
574 | const Symbol_value<size>*, | |
575 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 576 | section_size_type); |
2e30d253 ILT |
577 | |
578 | private: | |
579 | // Do a TLS relocation. | |
580 | inline void | |
fc51264f L |
581 | relocate_tls(const Relocate_info<size, false>*, Target_x86_64*, |
582 | size_t relnum, const elfcpp::Rela<size, false>&, | |
583 | unsigned int r_type, const Sized_symbol<size>*, | |
584 | const Symbol_value<size>*, | |
585 | unsigned char*, typename elfcpp::Elf_types<size>::Elf_Addr, | |
fe8718a4 | 586 | section_size_type); |
2e30d253 | 587 | |
c2b45e22 | 588 | // Do a TLS General-Dynamic to Initial-Exec transition. |
7bf1f802 | 589 | inline void |
fc51264f | 590 | tls_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
7bf1f802 | 591 | Output_segment* tls_segment, |
fc51264f L |
592 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
593 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
7bf1f802 | 594 | unsigned char* view, |
fc51264f | 595 | typename elfcpp::Elf_types<size>::Elf_Addr, |
fe8718a4 | 596 | section_size_type view_size); |
7bf1f802 | 597 | |
56622147 ILT |
598 | // Do a TLS General-Dynamic to Local-Exec transition. |
599 | inline void | |
fc51264f | 600 | tls_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 601 | Output_segment* tls_segment, |
fc51264f L |
602 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
603 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 604 | unsigned char* view, |
fe8718a4 | 605 | section_size_type view_size); |
2e30d253 | 606 | |
c2b45e22 CC |
607 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
608 | inline void | |
fc51264f | 609 | tls_desc_gd_to_ie(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 610 | Output_segment* tls_segment, |
fc51264f L |
611 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
612 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 | 613 | unsigned char* view, |
fc51264f | 614 | typename elfcpp::Elf_types<size>::Elf_Addr, |
c2b45e22 CC |
615 | section_size_type view_size); |
616 | ||
617 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
618 | inline void | |
fc51264f | 619 | tls_desc_gd_to_le(const Relocate_info<size, false>*, size_t relnum, |
c2b45e22 | 620 | Output_segment* tls_segment, |
fc51264f L |
621 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
622 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
c2b45e22 CC |
623 | unsigned char* view, |
624 | section_size_type view_size); | |
625 | ||
56622147 | 626 | // Do a TLS Local-Dynamic to Local-Exec transition. |
2e30d253 | 627 | inline void |
fc51264f | 628 | tls_ld_to_le(const Relocate_info<size, false>*, size_t relnum, |
2e30d253 | 629 | Output_segment* tls_segment, |
fc51264f L |
630 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
631 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
2e30d253 | 632 | unsigned char* view, |
fe8718a4 | 633 | section_size_type view_size); |
2e30d253 | 634 | |
56622147 ILT |
635 | // Do a TLS Initial-Exec to Local-Exec transition. |
636 | static inline void | |
fc51264f | 637 | tls_ie_to_le(const Relocate_info<size, false>*, size_t relnum, |
72ec2876 | 638 | Output_segment* tls_segment, |
fc51264f L |
639 | const elfcpp::Rela<size, false>&, unsigned int r_type, |
640 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
72ec2876 | 641 | unsigned char* view, |
fe8718a4 | 642 | section_size_type view_size); |
2e30d253 ILT |
643 | |
644 | // This is set if we should skip the next reloc, which should be a | |
645 | // PLT32 reloc against ___tls_get_addr. | |
646 | bool skip_call_tls_get_addr_; | |
647 | }; | |
648 | ||
6a74a719 ILT |
649 | // A class which returns the size required for a relocation type, |
650 | // used while scanning relocs during a relocatable link. | |
651 | class Relocatable_size_for_reloc | |
652 | { | |
653 | public: | |
654 | unsigned int | |
655 | get_size_for_reloc(unsigned int, Relobj*); | |
656 | }; | |
657 | ||
2e30d253 ILT |
658 | // Adjust TLS relocation type based on the options and whether this |
659 | // is a local symbol. | |
e041f13d | 660 | static tls::Tls_optimization |
2e30d253 ILT |
661 | optimize_tls_reloc(bool is_final, int r_type); |
662 | ||
663 | // Get the GOT section, creating it if necessary. | |
664 | Output_data_got<64, false>* | |
665 | got_section(Symbol_table*, Layout*); | |
666 | ||
96f2030e ILT |
667 | // Get the GOT PLT section. |
668 | Output_data_space* | |
669 | got_plt_section() const | |
670 | { | |
671 | gold_assert(this->got_plt_ != NULL); | |
672 | return this->got_plt_; | |
673 | } | |
674 | ||
a8df5856 ILT |
675 | // Get the GOT section for TLSDESC entries. |
676 | Output_data_got<64, false>* | |
677 | got_tlsdesc_section() const | |
678 | { | |
679 | gold_assert(this->got_tlsdesc_ != NULL); | |
680 | return this->got_tlsdesc_; | |
681 | } | |
682 | ||
c2b45e22 CC |
683 | // Create the PLT section. |
684 | void | |
685 | make_plt_section(Symbol_table* symtab, Layout* layout); | |
686 | ||
2e30d253 ILT |
687 | // Create a PLT entry for a global symbol. |
688 | void | |
689 | make_plt_entry(Symbol_table*, Layout*, Symbol*); | |
690 | ||
7223e9ca ILT |
691 | // Create a PLT entry for a local STT_GNU_IFUNC symbol. |
692 | void | |
693 | make_local_ifunc_plt_entry(Symbol_table*, Layout*, | |
fc51264f | 694 | Sized_relobj_file<size, false>* relobj, |
7223e9ca ILT |
695 | unsigned int local_sym_index); |
696 | ||
9fa33bee | 697 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 CC |
698 | void |
699 | define_tls_base_symbol(Symbol_table*, Layout*); | |
700 | ||
c2b45e22 CC |
701 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
702 | void | |
703 | reserve_tlsdesc_entries(Symbol_table* symtab, Layout* layout); | |
704 | ||
31d60480 ILT |
705 | // Create a GOT entry for the TLS module index. |
706 | unsigned int | |
707 | got_mod_index_entry(Symbol_table* symtab, Layout* layout, | |
fc51264f | 708 | Sized_relobj_file<size, false>* object); |
31d60480 | 709 | |
2e30d253 | 710 | // Get the PLT section. |
fc51264f | 711 | Output_data_plt_x86_64<size>* |
2e30d253 ILT |
712 | plt_section() const |
713 | { | |
714 | gold_assert(this->plt_ != NULL); | |
715 | return this->plt_; | |
716 | } | |
717 | ||
718 | // Get the dynamic reloc section, creating it if necessary. | |
719 | Reloc_section* | |
0ffd9845 | 720 | rela_dyn_section(Layout*); |
2e30d253 | 721 | |
e291e7b9 ILT |
722 | // Get the section to use for TLSDESC relocations. |
723 | Reloc_section* | |
724 | rela_tlsdesc_section(Layout*) const; | |
725 | ||
67181c72 ILT |
726 | // Get the section to use for IRELATIVE relocations. |
727 | Reloc_section* | |
728 | rela_irelative_section(Layout*); | |
729 | ||
12c0daef | 730 | // Add a potential copy relocation. |
2e30d253 | 731 | void |
ef9beddf | 732 | copy_reloc(Symbol_table* symtab, Layout* layout, |
fc51264f | 733 | Sized_relobj_file<size, false>* object, |
12c0daef | 734 | unsigned int shndx, Output_section* output_section, |
fc51264f | 735 | Symbol* sym, const elfcpp::Rela<size, false>& reloc) |
12c0daef ILT |
736 | { |
737 | this->copy_relocs_.copy_reloc(symtab, layout, | |
fc51264f | 738 | symtab->get_sized_symbol<size>(sym), |
12c0daef ILT |
739 | object, shndx, output_section, |
740 | reloc, this->rela_dyn_section(layout)); | |
741 | } | |
2e30d253 ILT |
742 | |
743 | // Information about this specific target which we pass to the | |
744 | // general Target structure. | |
745 | static const Target::Target_info x86_64_info; | |
746 | ||
0e70b911 CC |
747 | // The types of GOT entries needed for this platform. |
748 | // These values are exposed to the ABI in an incremental link. | |
749 | // Do not renumber existing values without changing the version | |
750 | // number of the .gnu_incremental_inputs section. | |
0a65a3a7 CC |
751 | enum Got_type |
752 | { | |
753 | GOT_TYPE_STANDARD = 0, // GOT entry for a regular symbol | |
754 | GOT_TYPE_TLS_OFFSET = 1, // GOT entry for TLS offset | |
755 | GOT_TYPE_TLS_PAIR = 2, // GOT entry for TLS module/offset pair | |
756 | GOT_TYPE_TLS_DESC = 3 // GOT entry for TLS_DESC pair | |
757 | }; | |
758 | ||
e291e7b9 ILT |
759 | // This type is used as the argument to the target specific |
760 | // relocation routines. The only target specific reloc is | |
761 | // R_X86_64_TLSDESC against a local symbol. | |
762 | struct Tlsdesc_info | |
763 | { | |
fc51264f | 764 | Tlsdesc_info(Sized_relobj_file<size, false>* a_object, unsigned int a_r_sym) |
e291e7b9 ILT |
765 | : object(a_object), r_sym(a_r_sym) |
766 | { } | |
767 | ||
768 | // The object in which the local symbol is defined. | |
fc51264f | 769 | Sized_relobj_file<size, false>* object; |
e291e7b9 ILT |
770 | // The local symbol index in the object. |
771 | unsigned int r_sym; | |
772 | }; | |
773 | ||
2e30d253 ILT |
774 | // The GOT section. |
775 | Output_data_got<64, false>* got_; | |
776 | // The PLT section. | |
fc51264f | 777 | Output_data_plt_x86_64<size>* plt_; |
2e30d253 ILT |
778 | // The GOT PLT section. |
779 | Output_data_space* got_plt_; | |
67181c72 ILT |
780 | // The GOT section for IRELATIVE relocations. |
781 | Output_data_space* got_irelative_; | |
a8df5856 ILT |
782 | // The GOT section for TLSDESC relocations. |
783 | Output_data_got<64, false>* got_tlsdesc_; | |
e785ec03 ILT |
784 | // The _GLOBAL_OFFSET_TABLE_ symbol. |
785 | Symbol* global_offset_table_; | |
2e30d253 | 786 | // The dynamic reloc section. |
0ffd9845 | 787 | Reloc_section* rela_dyn_; |
67181c72 ILT |
788 | // The section to use for IRELATIVE relocs. |
789 | Reloc_section* rela_irelative_; | |
2e30d253 | 790 | // Relocs saved to avoid a COPY reloc. |
fc51264f | 791 | Copy_relocs<elfcpp::SHT_RELA, size, false> copy_relocs_; |
2e30d253 ILT |
792 | // Space for variables copied with a COPY reloc. |
793 | Output_data_space* dynbss_; | |
c2b45e22 | 794 | // Offset of the GOT entry for the TLS module index. |
31d60480 | 795 | unsigned int got_mod_index_offset_; |
e291e7b9 ILT |
796 | // We handle R_X86_64_TLSDESC against a local symbol as a target |
797 | // specific relocation. Here we store the object and local symbol | |
798 | // index for the relocation. | |
799 | std::vector<Tlsdesc_info> tlsdesc_reloc_info_; | |
edfbb029 CC |
800 | // True if the _TLS_MODULE_BASE_ symbol has been defined. |
801 | bool tls_base_symbol_defined_; | |
2e30d253 ILT |
802 | }; |
803 | ||
fc51264f L |
804 | template<> |
805 | const Target::Target_info Target_x86_64<64>::x86_64_info = | |
2e30d253 ILT |
806 | { |
807 | 64, // size | |
808 | false, // is_big_endian | |
809 | elfcpp::EM_X86_64, // machine_code | |
810 | false, // has_make_symbol | |
811 | false, // has_resolve | |
812 | true, // has_code_fill | |
35cdfc9a | 813 | true, // is_default_stack_executable |
b3ce541e | 814 | true, // can_icf_inline_merge_sections |
0864d551 | 815 | '\0', // wrap_char |
2e30d253 | 816 | "/lib/ld64.so.1", // program interpreter |
0c5e9c22 | 817 | 0x400000, // default_text_segment_address |
cd72c291 | 818 | 0x1000, // abi_pagesize (overridable by -z max-page-size) |
8a5e3e08 ILT |
819 | 0x1000, // common_pagesize (overridable by -z common-page-size) |
820 | elfcpp::SHN_UNDEF, // small_common_shndx | |
821 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
822 | 0, // small_common_section_flags | |
05a352e6 DK |
823 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags |
824 | NULL, // attributes_section | |
825 | NULL // attributes_vendor | |
2e30d253 ILT |
826 | }; |
827 | ||
fc51264f L |
828 | template<> |
829 | const Target::Target_info Target_x86_64<32>::x86_64_info = | |
830 | { | |
831 | 32, // size | |
832 | false, // is_big_endian | |
833 | elfcpp::EM_X86_64, // machine_code | |
834 | false, // has_make_symbol | |
835 | false, // has_resolve | |
836 | true, // has_code_fill | |
837 | true, // is_default_stack_executable | |
838 | true, // can_icf_inline_merge_sections | |
839 | '\0', // wrap_char | |
840 | "/libx32/ldx32.so.1", // program interpreter | |
841 | 0x400000, // default_text_segment_address | |
842 | 0x1000, // abi_pagesize (overridable by -z max-page-size) | |
843 | 0x1000, // common_pagesize (overridable by -z common-page-size) | |
844 | elfcpp::SHN_UNDEF, // small_common_shndx | |
845 | elfcpp::SHN_X86_64_LCOMMON, // large_common_shndx | |
846 | 0, // small_common_section_flags | |
847 | elfcpp::SHF_X86_64_LARGE, // large_common_section_flags | |
848 | NULL, // attributes_section | |
849 | NULL // attributes_vendor | |
850 | }; | |
851 | ||
8a5e3e08 ILT |
852 | // This is called when a new output section is created. This is where |
853 | // we handle the SHF_X86_64_LARGE. | |
854 | ||
fc51264f | 855 | template<int size> |
8a5e3e08 | 856 | void |
fc51264f | 857 | Target_x86_64<size>::do_new_output_section(Output_section* os) const |
8a5e3e08 ILT |
858 | { |
859 | if ((os->flags() & elfcpp::SHF_X86_64_LARGE) != 0) | |
860 | os->set_is_large_section(); | |
861 | } | |
862 | ||
2e30d253 ILT |
863 | // Get the GOT section, creating it if necessary. |
864 | ||
fc51264f | 865 | template<int size> |
2e30d253 | 866 | Output_data_got<64, false>* |
fc51264f | 867 | Target_x86_64<size>::got_section(Symbol_table* symtab, Layout* layout) |
2e30d253 ILT |
868 | { |
869 | if (this->got_ == NULL) | |
870 | { | |
871 | gold_assert(symtab != NULL && layout != NULL); | |
872 | ||
9446efde ILT |
873 | // When using -z now, we can treat .got.plt as a relro section. |
874 | // Without -z now, it is modified after program startup by lazy | |
875 | // PLT relocations. | |
876 | bool is_got_plt_relro = parameters->options().now(); | |
877 | Output_section_order got_order = (is_got_plt_relro | |
878 | ? ORDER_RELRO | |
879 | : ORDER_RELRO_LAST); | |
880 | Output_section_order got_plt_order = (is_got_plt_relro | |
881 | ? ORDER_RELRO | |
882 | : ORDER_NON_RELRO_FIRST); | |
883 | ||
2e30d253 ILT |
884 | this->got_ = new Output_data_got<64, false>(); |
885 | ||
82742395 ILT |
886 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, |
887 | (elfcpp::SHF_ALLOC | |
888 | | elfcpp::SHF_WRITE), | |
9446efde | 889 | this->got_, got_order, true); |
2e30d253 | 890 | |
7d9e3d98 | 891 | this->got_plt_ = new Output_data_space(8, "** GOT PLT"); |
82742395 ILT |
892 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, |
893 | (elfcpp::SHF_ALLOC | |
894 | | elfcpp::SHF_WRITE), | |
9446efde ILT |
895 | this->got_plt_, got_plt_order, |
896 | is_got_plt_relro); | |
2e30d253 ILT |
897 | |
898 | // The first three entries are reserved. | |
27bc2bce | 899 | this->got_plt_->set_current_data_size(3 * 8); |
2e30d253 | 900 | |
9446efde ILT |
901 | if (!is_got_plt_relro) |
902 | { | |
903 | // Those bytes can go into the relro segment. | |
904 | layout->increase_relro(3 * 8); | |
905 | } | |
1a2dff53 | 906 | |
2e30d253 | 907 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. |
e785ec03 ILT |
908 | this->global_offset_table_ = |
909 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
910 | Symbol_table::PREDEFINED, | |
911 | this->got_plt_, | |
912 | 0, 0, elfcpp::STT_OBJECT, | |
913 | elfcpp::STB_LOCAL, | |
914 | elfcpp::STV_HIDDEN, 0, | |
915 | false, false); | |
a8df5856 | 916 | |
67181c72 ILT |
917 | // If there are any IRELATIVE relocations, they get GOT entries |
918 | // in .got.plt after the jump slot entries. | |
919 | this->got_irelative_ = new Output_data_space(8, "** GOT IRELATIVE PLT"); | |
920 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
921 | (elfcpp::SHF_ALLOC | |
922 | | elfcpp::SHF_WRITE), | |
923 | this->got_irelative_, | |
9446efde | 924 | got_plt_order, is_got_plt_relro); |
67181c72 | 925 | |
a8df5856 | 926 | // If there are any TLSDESC relocations, they get GOT entries in |
67181c72 | 927 | // .got.plt after the jump slot and IRELATIVE entries. |
a8df5856 ILT |
928 | this->got_tlsdesc_ = new Output_data_got<64, false>(); |
929 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
930 | (elfcpp::SHF_ALLOC | |
931 | | elfcpp::SHF_WRITE), | |
22f0da72 | 932 | this->got_tlsdesc_, |
9446efde | 933 | got_plt_order, is_got_plt_relro); |
2e30d253 ILT |
934 | } |
935 | ||
936 | return this->got_; | |
937 | } | |
938 | ||
939 | // Get the dynamic reloc section, creating it if necessary. | |
940 | ||
fc51264f L |
941 | template<int size> |
942 | typename Target_x86_64<size>::Reloc_section* | |
943 | Target_x86_64<size>::rela_dyn_section(Layout* layout) | |
2e30d253 | 944 | { |
0ffd9845 | 945 | if (this->rela_dyn_ == NULL) |
2e30d253 ILT |
946 | { |
947 | gold_assert(layout != NULL); | |
d98bc257 | 948 | this->rela_dyn_ = new Reloc_section(parameters->options().combreloc()); |
2e30d253 | 949 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, |
22f0da72 ILT |
950 | elfcpp::SHF_ALLOC, this->rela_dyn_, |
951 | ORDER_DYNAMIC_RELOCS, false); | |
2e30d253 | 952 | } |
0ffd9845 | 953 | return this->rela_dyn_; |
2e30d253 ILT |
954 | } |
955 | ||
67181c72 ILT |
956 | // Get the section to use for IRELATIVE relocs, creating it if |
957 | // necessary. These go in .rela.dyn, but only after all other dynamic | |
958 | // relocations. They need to follow the other dynamic relocations so | |
959 | // that they can refer to global variables initialized by those | |
960 | // relocs. | |
961 | ||
fc51264f L |
962 | template<int size> |
963 | typename Target_x86_64<size>::Reloc_section* | |
964 | Target_x86_64<size>::rela_irelative_section(Layout* layout) | |
67181c72 ILT |
965 | { |
966 | if (this->rela_irelative_ == NULL) | |
967 | { | |
968 | // Make sure we have already created the dynamic reloc section. | |
969 | this->rela_dyn_section(layout); | |
970 | this->rela_irelative_ = new Reloc_section(false); | |
971 | layout->add_output_section_data(".rela.dyn", elfcpp::SHT_RELA, | |
972 | elfcpp::SHF_ALLOC, this->rela_irelative_, | |
973 | ORDER_DYNAMIC_RELOCS, false); | |
974 | gold_assert(this->rela_dyn_->output_section() | |
975 | == this->rela_irelative_->output_section()); | |
976 | } | |
977 | return this->rela_irelative_; | |
978 | } | |
979 | ||
4829d394 | 980 | // Initialize the PLT section. |
2e30d253 | 981 | |
fc51264f | 982 | template<int size> |
4829d394 | 983 | void |
fc51264f | 984 | Output_data_plt_x86_64<size>::init(Layout* layout) |
2e30d253 | 985 | { |
d98bc257 | 986 | this->rel_ = new Reloc_section(false); |
2e30d253 | 987 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, |
22f0da72 ILT |
988 | elfcpp::SHF_ALLOC, this->rel_, |
989 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
7223e9ca | 990 | |
07a60597 ILT |
991 | // Add unwind information if requested. |
992 | if (parameters->options().ld_generated_unwind_info()) | |
993 | layout->add_eh_frame_for_plt(this, plt_eh_frame_cie, plt_eh_frame_cie_size, | |
994 | plt_eh_frame_fde, plt_eh_frame_fde_size); | |
2e30d253 ILT |
995 | } |
996 | ||
fc51264f | 997 | template<int size> |
2e30d253 | 998 | void |
fc51264f | 999 | Output_data_plt_x86_64<size>::do_adjust_output_section(Output_section* os) |
2e30d253 | 1000 | { |
b0481b0b | 1001 | os->set_entsize(plt_entry_size); |
2e30d253 ILT |
1002 | } |
1003 | ||
1004 | // Add an entry to the PLT. | |
1005 | ||
fc51264f | 1006 | template<int size> |
2e30d253 | 1007 | void |
fc51264f L |
1008 | Output_data_plt_x86_64<size>::add_entry(Symbol_table* symtab, Layout* layout, |
1009 | Symbol* gsym) | |
2e30d253 ILT |
1010 | { |
1011 | gold_assert(!gsym->has_plt_offset()); | |
1012 | ||
4829d394 CC |
1013 | unsigned int plt_index; |
1014 | off_t plt_offset; | |
1015 | section_offset_type got_offset; | |
2e30d253 | 1016 | |
67181c72 ILT |
1017 | unsigned int* pcount; |
1018 | unsigned int offset; | |
1019 | unsigned int reserved; | |
1020 | Output_data_space* got; | |
1021 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1022 | && gsym->can_use_relative_reloc(false)) | |
1023 | { | |
1024 | pcount = &this->irelative_count_; | |
1025 | offset = 0; | |
1026 | reserved = 0; | |
1027 | got = this->got_irelative_; | |
1028 | } | |
1029 | else | |
1030 | { | |
1031 | pcount = &this->count_; | |
1032 | offset = 1; | |
1033 | reserved = 3; | |
1034 | got = this->got_plt_; | |
1035 | } | |
1036 | ||
4829d394 CC |
1037 | if (!this->is_data_size_valid()) |
1038 | { | |
67181c72 ILT |
1039 | // Note that when setting the PLT offset for a non-IRELATIVE |
1040 | // entry we skip the initial reserved PLT entry. | |
1041 | plt_index = *pcount + offset; | |
4829d394 | 1042 | plt_offset = plt_index * plt_entry_size; |
2e30d253 | 1043 | |
67181c72 | 1044 | ++*pcount; |
2e30d253 | 1045 | |
67181c72 ILT |
1046 | got_offset = (plt_index - offset + reserved) * 8; |
1047 | gold_assert(got_offset == got->current_data_size()); | |
2e30d253 | 1048 | |
4829d394 CC |
1049 | // Every PLT entry needs a GOT entry which points back to the PLT |
1050 | // entry (this will be changed by the dynamic linker, normally | |
1051 | // lazily when the function is called). | |
67181c72 | 1052 | got->set_current_data_size(got_offset + 8); |
4829d394 | 1053 | } |
7223e9ca ILT |
1054 | else |
1055 | { | |
67181c72 ILT |
1056 | // FIXME: This is probably not correct for IRELATIVE relocs. |
1057 | ||
4829d394 CC |
1058 | // For incremental updates, find an available slot. |
1059 | plt_offset = this->free_list_.allocate(plt_entry_size, plt_entry_size, 0); | |
1060 | if (plt_offset == -1) | |
e6455dfb CC |
1061 | gold_fallback(_("out of patch space (PLT);" |
1062 | " relink with --incremental-full")); | |
4829d394 CC |
1063 | |
1064 | // The GOT and PLT entries have a 1-1 correspondance, so the GOT offset | |
1065 | // can be calculated from the PLT index, adjusting for the three | |
1066 | // reserved entries at the beginning of the GOT. | |
1067 | plt_index = plt_offset / plt_entry_size - 1; | |
67181c72 | 1068 | got_offset = (plt_index - offset + reserved) * 8; |
7223e9ca | 1069 | } |
2e30d253 | 1070 | |
4829d394 CC |
1071 | gsym->set_plt_offset(plt_offset); |
1072 | ||
1073 | // Every PLT entry needs a reloc. | |
67181c72 | 1074 | this->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 | 1075 | |
2e30d253 ILT |
1076 | // Note that we don't need to save the symbol. The contents of the |
1077 | // PLT are independent of which symbols are used. The symbols only | |
1078 | // appear in the relocations. | |
1079 | } | |
1080 | ||
7223e9ca ILT |
1081 | // Add an entry to the PLT for a local STT_GNU_IFUNC symbol. Return |
1082 | // the PLT offset. | |
1083 | ||
fc51264f | 1084 | template<int size> |
7223e9ca | 1085 | unsigned int |
fc51264f | 1086 | Output_data_plt_x86_64<size>::add_local_ifunc_entry( |
67181c72 ILT |
1087 | Symbol_table* symtab, |
1088 | Layout* layout, | |
fc51264f | 1089 | Sized_relobj_file<size, false>* relobj, |
6fa2a40b | 1090 | unsigned int local_sym_index) |
7223e9ca | 1091 | { |
67181c72 ILT |
1092 | unsigned int plt_offset = this->irelative_count_ * plt_entry_size; |
1093 | ++this->irelative_count_; | |
7223e9ca | 1094 | |
67181c72 | 1095 | section_offset_type got_offset = this->got_irelative_->current_data_size(); |
7223e9ca ILT |
1096 | |
1097 | // Every PLT entry needs a GOT entry which points back to the PLT | |
1098 | // entry. | |
67181c72 | 1099 | this->got_irelative_->set_current_data_size(got_offset + 8); |
7223e9ca ILT |
1100 | |
1101 | // Every PLT entry needs a reloc. | |
67181c72 ILT |
1102 | Reloc_section* rela = this->rela_irelative(symtab, layout); |
1103 | rela->add_symbolless_local_addend(relobj, local_sym_index, | |
1104 | elfcpp::R_X86_64_IRELATIVE, | |
1105 | this->got_irelative_, got_offset, 0); | |
7223e9ca ILT |
1106 | |
1107 | return plt_offset; | |
1108 | } | |
1109 | ||
4829d394 CC |
1110 | // Add the relocation for a PLT entry. |
1111 | ||
fc51264f | 1112 | template<int size> |
4829d394 | 1113 | void |
fc51264f L |
1114 | Output_data_plt_x86_64<size>::add_relocation(Symbol_table* symtab, |
1115 | Layout* layout, | |
1116 | Symbol* gsym, | |
1117 | unsigned int got_offset) | |
4829d394 CC |
1118 | { |
1119 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1120 | && gsym->can_use_relative_reloc(false)) | |
67181c72 ILT |
1121 | { |
1122 | Reloc_section* rela = this->rela_irelative(symtab, layout); | |
1123 | rela->add_symbolless_global_addend(gsym, elfcpp::R_X86_64_IRELATIVE, | |
1124 | this->got_irelative_, got_offset, 0); | |
1125 | } | |
4829d394 CC |
1126 | else |
1127 | { | |
1128 | gsym->set_needs_dynsym_entry(); | |
1129 | this->rel_->add_global(gsym, elfcpp::R_X86_64_JUMP_SLOT, this->got_plt_, | |
1130 | got_offset, 0); | |
1131 | } | |
1132 | } | |
1133 | ||
e291e7b9 ILT |
1134 | // Return where the TLSDESC relocations should go, creating it if |
1135 | // necessary. These follow the JUMP_SLOT relocations. | |
1136 | ||
fc51264f L |
1137 | template<int size> |
1138 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1139 | Output_data_plt_x86_64<size>::rela_tlsdesc(Layout* layout) | |
e291e7b9 ILT |
1140 | { |
1141 | if (this->tlsdesc_rel_ == NULL) | |
1142 | { | |
1143 | this->tlsdesc_rel_ = new Reloc_section(false); | |
1144 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1145 | elfcpp::SHF_ALLOC, this->tlsdesc_rel_, | |
22f0da72 | 1146 | ORDER_DYNAMIC_PLT_RELOCS, false); |
67181c72 ILT |
1147 | gold_assert(this->tlsdesc_rel_->output_section() |
1148 | == this->rel_->output_section()); | |
e291e7b9 ILT |
1149 | } |
1150 | return this->tlsdesc_rel_; | |
1151 | } | |
1152 | ||
67181c72 ILT |
1153 | // Return where the IRELATIVE relocations should go in the PLT. These |
1154 | // follow the JUMP_SLOT and the TLSDESC relocations. | |
1155 | ||
fc51264f L |
1156 | template<int size> |
1157 | typename Output_data_plt_x86_64<size>::Reloc_section* | |
1158 | Output_data_plt_x86_64<size>::rela_irelative(Symbol_table* symtab, | |
1159 | Layout* layout) | |
67181c72 ILT |
1160 | { |
1161 | if (this->irelative_rel_ == NULL) | |
1162 | { | |
1163 | // Make sure we have a place for the TLSDESC relocations, in | |
1164 | // case we see any later on. | |
1165 | this->rela_tlsdesc(layout); | |
1166 | this->irelative_rel_ = new Reloc_section(false); | |
1167 | layout->add_output_section_data(".rela.plt", elfcpp::SHT_RELA, | |
1168 | elfcpp::SHF_ALLOC, this->irelative_rel_, | |
1169 | ORDER_DYNAMIC_PLT_RELOCS, false); | |
1170 | gold_assert(this->irelative_rel_->output_section() | |
1171 | == this->rel_->output_section()); | |
1172 | ||
1173 | if (parameters->doing_static_link()) | |
1174 | { | |
1175 | // A statically linked executable will only have a .rela.plt | |
1176 | // section to hold R_X86_64_IRELATIVE relocs for | |
1177 | // STT_GNU_IFUNC symbols. The library will use these | |
1178 | // symbols to locate the IRELATIVE relocs at program startup | |
1179 | // time. | |
1180 | symtab->define_in_output_data("__rela_iplt_start", NULL, | |
1181 | Symbol_table::PREDEFINED, | |
1182 | this->irelative_rel_, 0, 0, | |
1183 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1184 | elfcpp::STV_HIDDEN, 0, false, true); | |
1185 | symtab->define_in_output_data("__rela_iplt_end", NULL, | |
1186 | Symbol_table::PREDEFINED, | |
1187 | this->irelative_rel_, 0, 0, | |
1188 | elfcpp::STT_NOTYPE, elfcpp::STB_GLOBAL, | |
1189 | elfcpp::STV_HIDDEN, 0, true, true); | |
1190 | } | |
1191 | } | |
1192 | return this->irelative_rel_; | |
1193 | } | |
1194 | ||
1195 | // Return the PLT address to use for a global symbol. | |
1196 | ||
fc51264f | 1197 | template<int size> |
67181c72 | 1198 | uint64_t |
fc51264f | 1199 | Output_data_plt_x86_64<size>::address_for_global(const Symbol* gsym) |
67181c72 ILT |
1200 | { |
1201 | uint64_t offset = 0; | |
1202 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
1203 | && gsym->can_use_relative_reloc(false)) | |
1204 | offset = (this->count_ + 1) * plt_entry_size; | |
1205 | return this->address() + offset; | |
1206 | } | |
1207 | ||
1208 | // Return the PLT address to use for a local symbol. These are always | |
1209 | // IRELATIVE relocs. | |
1210 | ||
fc51264f | 1211 | template<int size> |
67181c72 | 1212 | uint64_t |
fc51264f | 1213 | Output_data_plt_x86_64<size>::address_for_local(const Relobj*, unsigned int) |
67181c72 ILT |
1214 | { |
1215 | return this->address() + (this->count_ + 1) * plt_entry_size; | |
1216 | } | |
1217 | ||
c2b45e22 | 1218 | // Set the final size. |
fc51264f | 1219 | template<int size> |
c2b45e22 | 1220 | void |
fc51264f | 1221 | Output_data_plt_x86_64<size>::set_final_data_size() |
c2b45e22 | 1222 | { |
67181c72 | 1223 | unsigned int count = this->count_ + this->irelative_count_; |
c2b45e22 CC |
1224 | if (this->has_tlsdesc_entry()) |
1225 | ++count; | |
1226 | this->set_data_size((count + 1) * plt_entry_size); | |
1227 | } | |
1228 | ||
2e30d253 ILT |
1229 | // The first entry in the PLT for an executable. |
1230 | ||
fc51264f L |
1231 | template<int size> |
1232 | const unsigned char | |
1233 | Output_data_plt_x86_64<size>::first_plt_entry[plt_entry_size] = | |
2e30d253 ILT |
1234 | { |
1235 | // From AMD64 ABI Draft 0.98, page 76 | |
1236 | 0xff, 0x35, // pushq contents of memory address | |
2e30d253 | 1237 | 0, 0, 0, 0, // replaced with address of .got + 8 |
78d911fd ILT |
1238 | 0xff, 0x25, // jmp indirect |
1239 | 0, 0, 0, 0, // replaced with address of .got + 16 | |
2e30d253 ILT |
1240 | 0x90, 0x90, 0x90, 0x90 // noop (x4) |
1241 | }; | |
1242 | ||
1243 | // Subsequent entries in the PLT for an executable. | |
1244 | ||
fc51264f L |
1245 | template<int size> |
1246 | const unsigned char | |
1247 | Output_data_plt_x86_64<size>::plt_entry[plt_entry_size] = | |
2e30d253 ILT |
1248 | { |
1249 | // From AMD64 ABI Draft 0.98, page 76 | |
1250 | 0xff, 0x25, // jmpq indirect | |
1251 | 0, 0, 0, 0, // replaced with address of symbol in .got | |
1252 | 0x68, // pushq immediate | |
1253 | 0, 0, 0, 0, // replaced with offset into relocation table | |
1254 | 0xe9, // jmpq relative | |
1255 | 0, 0, 0, 0 // replaced with offset to start of .plt | |
1256 | }; | |
1257 | ||
c2b45e22 CC |
1258 | // The reserved TLSDESC entry in the PLT for an executable. |
1259 | ||
fc51264f L |
1260 | template<int size> |
1261 | const unsigned char | |
1262 | Output_data_plt_x86_64<size>::tlsdesc_plt_entry[plt_entry_size] = | |
c2b45e22 CC |
1263 | { |
1264 | // From Alexandre Oliva, "Thread-Local Storage Descriptors for IA32 | |
1265 | // and AMD64/EM64T", Version 0.9.4 (2005-10-10). | |
1266 | 0xff, 0x35, // pushq x(%rip) | |
1267 | 0, 0, 0, 0, // replaced with address of linkmap GOT entry (at PLTGOT + 8) | |
1268 | 0xff, 0x25, // jmpq *y(%rip) | |
1269 | 0, 0, 0, 0, // replaced with offset of reserved TLSDESC_GOT entry | |
1270 | 0x0f, 0x1f, // nop | |
1271 | 0x40, 0 | |
1272 | }; | |
1273 | ||
07a60597 ILT |
1274 | // The .eh_frame unwind information for the PLT. |
1275 | ||
fc51264f | 1276 | template<int size> |
07a60597 | 1277 | const unsigned char |
fc51264f | 1278 | Output_data_plt_x86_64<size>::plt_eh_frame_cie[plt_eh_frame_cie_size] = |
07a60597 ILT |
1279 | { |
1280 | 1, // CIE version. | |
1281 | 'z', // Augmentation: augmentation size included. | |
1282 | 'R', // Augmentation: FDE encoding included. | |
1283 | '\0', // End of augmentation string. | |
1284 | 1, // Code alignment factor. | |
1285 | 0x78, // Data alignment factor. | |
1286 | 16, // Return address column. | |
1287 | 1, // Augmentation size. | |
1288 | (elfcpp::DW_EH_PE_pcrel // FDE encoding. | |
1289 | | elfcpp::DW_EH_PE_sdata4), | |
1290 | elfcpp::DW_CFA_def_cfa, 7, 8, // DW_CFA_def_cfa: r7 (rsp) ofs 8. | |
1291 | elfcpp::DW_CFA_offset + 16, 1,// DW_CFA_offset: r16 (rip) at cfa-8. | |
1292 | elfcpp::DW_CFA_nop, // Align to 16 bytes. | |
1293 | elfcpp::DW_CFA_nop | |
1294 | }; | |
1295 | ||
fc51264f | 1296 | template<int size> |
07a60597 | 1297 | const unsigned char |
fc51264f | 1298 | Output_data_plt_x86_64<size>::plt_eh_frame_fde[plt_eh_frame_fde_size] = |
07a60597 ILT |
1299 | { |
1300 | 0, 0, 0, 0, // Replaced with offset to .plt. | |
1301 | 0, 0, 0, 0, // Replaced with size of .plt. | |
1302 | 0, // Augmentation size. | |
1303 | elfcpp::DW_CFA_def_cfa_offset, 16, // DW_CFA_def_cfa_offset: 16. | |
1304 | elfcpp::DW_CFA_advance_loc + 6, // Advance 6 to __PLT__ + 6. | |
1305 | elfcpp::DW_CFA_def_cfa_offset, 24, // DW_CFA_def_cfa_offset: 24. | |
1306 | elfcpp::DW_CFA_advance_loc + 10, // Advance 10 to __PLT__ + 16. | |
1307 | elfcpp::DW_CFA_def_cfa_expression, // DW_CFA_def_cfa_expression. | |
1308 | 11, // Block length. | |
1309 | elfcpp::DW_OP_breg7, 8, // Push %rsp + 8. | |
1310 | elfcpp::DW_OP_breg16, 0, // Push %rip. | |
1311 | elfcpp::DW_OP_lit15, // Push 0xf. | |
1312 | elfcpp::DW_OP_and, // & (%rip & 0xf). | |
1313 | elfcpp::DW_OP_lit11, // Push 0xb. | |
1314 | elfcpp::DW_OP_ge, // >= ((%rip & 0xf) >= 0xb) | |
1315 | elfcpp::DW_OP_lit3, // Push 3. | |
1316 | elfcpp::DW_OP_shl, // << (((%rip & 0xf) >= 0xb) << 3) | |
1317 | elfcpp::DW_OP_plus, // + ((((%rip&0xf)>=0xb)<<3)+%rsp+8 | |
1318 | elfcpp::DW_CFA_nop, // Align to 32 bytes. | |
1319 | elfcpp::DW_CFA_nop, | |
1320 | elfcpp::DW_CFA_nop, | |
1321 | elfcpp::DW_CFA_nop | |
1322 | }; | |
1323 | ||
2e30d253 ILT |
1324 | // Write out the PLT. This uses the hand-coded instructions above, |
1325 | // and adjusts them as needed. This is specified by the AMD64 ABI. | |
1326 | ||
fc51264f | 1327 | template<int size> |
2e30d253 | 1328 | void |
fc51264f | 1329 | Output_data_plt_x86_64<size>::do_write(Output_file* of) |
2e30d253 | 1330 | { |
2ea97941 | 1331 | const off_t offset = this->offset(); |
fe8718a4 ILT |
1332 | const section_size_type oview_size = |
1333 | convert_to_section_size_type(this->data_size()); | |
2ea97941 | 1334 | unsigned char* const oview = of->get_output_view(offset, oview_size); |
2e30d253 ILT |
1335 | |
1336 | const off_t got_file_offset = this->got_plt_->offset(); | |
67181c72 ILT |
1337 | gold_assert(parameters->incremental_update() |
1338 | || (got_file_offset + this->got_plt_->data_size() | |
1339 | == this->got_irelative_->offset())); | |
fe8718a4 | 1340 | const section_size_type got_size = |
67181c72 ILT |
1341 | convert_to_section_size_type(this->got_plt_->data_size() |
1342 | + this->got_irelative_->data_size()); | |
2e30d253 ILT |
1343 | unsigned char* const got_view = of->get_output_view(got_file_offset, |
1344 | got_size); | |
1345 | ||
1346 | unsigned char* pov = oview; | |
1347 | ||
c2b45e22 | 1348 | // The base address of the .plt section. |
fc51264f | 1349 | typename elfcpp::Elf_types<size>::Elf_Addr plt_address = this->address(); |
c2b45e22 | 1350 | // The base address of the .got section. |
fc51264f | 1351 | typename elfcpp::Elf_types<size>::Elf_Addr got_base = this->got_->address(); |
c2b45e22 CC |
1352 | // The base address of the PLT portion of the .got section, |
1353 | // which is where the GOT pointer will point, and where the | |
1354 | // three reserved GOT entries are located. | |
fc51264f L |
1355 | typename elfcpp::Elf_types<size>::Elf_Addr got_address |
1356 | = this->got_plt_->address(); | |
2e30d253 ILT |
1357 | |
1358 | memcpy(pov, first_plt_entry, plt_entry_size); | |
78d911fd | 1359 | // We do a jmp relative to the PC at the end of this instruction. |
a984ee1d ILT |
1360 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
1361 | (got_address + 8 | |
1362 | - (plt_address + 6))); | |
1363 | elfcpp::Swap<32, false>::writeval(pov + 8, | |
1364 | (got_address + 16 | |
1365 | - (plt_address + 12))); | |
2e30d253 ILT |
1366 | pov += plt_entry_size; |
1367 | ||
1368 | unsigned char* got_pov = got_view; | |
1369 | ||
7d172687 ILT |
1370 | // The first entry in the GOT is the address of the .dynamic section |
1371 | // aka the PT_DYNAMIC segment. The next two entries are reserved. | |
1372 | // We saved space for them when we created the section in | |
1373 | // Target_x86_64::got_section. | |
1374 | Output_section* dynamic = this->layout_->dynamic_section(); | |
1375 | uint32_t dynamic_addr = dynamic == NULL ? 0 : dynamic->address(); | |
1376 | elfcpp::Swap<64, false>::writeval(got_pov, dynamic_addr); | |
1377 | got_pov += 8; | |
1378 | memset(got_pov, 0, 16); | |
1379 | got_pov += 16; | |
2e30d253 ILT |
1380 | |
1381 | unsigned int plt_offset = plt_entry_size; | |
1382 | unsigned int got_offset = 24; | |
67181c72 | 1383 | const unsigned int count = this->count_ + this->irelative_count_; |
2e30d253 ILT |
1384 | for (unsigned int plt_index = 0; |
1385 | plt_index < count; | |
1386 | ++plt_index, | |
1387 | pov += plt_entry_size, | |
1388 | got_pov += 8, | |
1389 | plt_offset += plt_entry_size, | |
1390 | got_offset += 8) | |
1391 | { | |
1392 | // Set and adjust the PLT entry itself. | |
1393 | memcpy(pov, plt_entry, plt_entry_size); | |
78d911fd ILT |
1394 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, |
1395 | (got_address + got_offset | |
1396 | - (plt_address + plt_offset | |
1397 | + 6))); | |
2e30d253 ILT |
1398 | |
1399 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 7, plt_index); | |
1400 | elfcpp::Swap<32, false>::writeval(pov + 12, | |
1401 | - (plt_offset + plt_entry_size)); | |
1402 | ||
1403 | // Set the entry in the GOT. | |
1404 | elfcpp::Swap<64, false>::writeval(got_pov, plt_address + plt_offset + 6); | |
1405 | } | |
1406 | ||
c2b45e22 CC |
1407 | if (this->has_tlsdesc_entry()) |
1408 | { | |
1409 | // Set and adjust the reserved TLSDESC PLT entry. | |
1410 | unsigned int tlsdesc_got_offset = this->get_tlsdesc_got_offset(); | |
1411 | memcpy(pov, tlsdesc_plt_entry, plt_entry_size); | |
1412 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 2, | |
1413 | (got_address + 8 | |
1414 | - (plt_address + plt_offset | |
1415 | + 6))); | |
1416 | elfcpp::Swap_unaligned<32, false>::writeval(pov + 8, | |
1417 | (got_base | |
1418 | + tlsdesc_got_offset | |
1419 | - (plt_address + plt_offset | |
1420 | + 12))); | |
1421 | pov += plt_entry_size; | |
1422 | } | |
1423 | ||
fe8718a4 ILT |
1424 | gold_assert(static_cast<section_size_type>(pov - oview) == oview_size); |
1425 | gold_assert(static_cast<section_size_type>(got_pov - got_view) == got_size); | |
2e30d253 | 1426 | |
2ea97941 | 1427 | of->write_output_view(offset, oview_size, oview); |
2e30d253 ILT |
1428 | of->write_output_view(got_file_offset, got_size, got_view); |
1429 | } | |
1430 | ||
c2b45e22 | 1431 | // Create the PLT section. |
2e30d253 | 1432 | |
fc51264f | 1433 | template<int size> |
2e30d253 | 1434 | void |
fc51264f | 1435 | Target_x86_64<size>::make_plt_section(Symbol_table* symtab, Layout* layout) |
2e30d253 | 1436 | { |
2e30d253 ILT |
1437 | if (this->plt_ == NULL) |
1438 | { | |
1439 | // Create the GOT sections first. | |
1440 | this->got_section(symtab, layout); | |
1441 | ||
fc51264f L |
1442 | this->plt_ = new Output_data_plt_x86_64<size>(layout, this->got_, |
1443 | this->got_plt_, | |
1444 | this->got_irelative_); | |
2e30d253 ILT |
1445 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1446 | (elfcpp::SHF_ALLOC | |
1447 | | elfcpp::SHF_EXECINSTR), | |
22f0da72 | 1448 | this->plt_, ORDER_PLT, false); |
7223e9ca ILT |
1449 | |
1450 | // Make the sh_info field of .rela.plt point to .plt. | |
1451 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1452 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
2e30d253 | 1453 | } |
c2b45e22 CC |
1454 | } |
1455 | ||
e291e7b9 ILT |
1456 | // Return the section for TLSDESC relocations. |
1457 | ||
fc51264f L |
1458 | template<int size> |
1459 | typename Target_x86_64<size>::Reloc_section* | |
1460 | Target_x86_64<size>::rela_tlsdesc_section(Layout* layout) const | |
e291e7b9 ILT |
1461 | { |
1462 | return this->plt_section()->rela_tlsdesc(layout); | |
1463 | } | |
1464 | ||
c2b45e22 CC |
1465 | // Create a PLT entry for a global symbol. |
1466 | ||
fc51264f | 1467 | template<int size> |
c2b45e22 | 1468 | void |
fc51264f L |
1469 | Target_x86_64<size>::make_plt_entry(Symbol_table* symtab, Layout* layout, |
1470 | Symbol* gsym) | |
c2b45e22 CC |
1471 | { |
1472 | if (gsym->has_plt_offset()) | |
1473 | return; | |
1474 | ||
1475 | if (this->plt_ == NULL) | |
1476 | this->make_plt_section(symtab, layout); | |
2e30d253 | 1477 | |
67181c72 | 1478 | this->plt_->add_entry(symtab, layout, gsym); |
2e30d253 ILT |
1479 | } |
1480 | ||
7223e9ca ILT |
1481 | // Make a PLT entry for a local STT_GNU_IFUNC symbol. |
1482 | ||
fc51264f | 1483 | template<int size> |
7223e9ca | 1484 | void |
fc51264f L |
1485 | Target_x86_64<size>::make_local_ifunc_plt_entry( |
1486 | Symbol_table* symtab, Layout* layout, | |
1487 | Sized_relobj_file<size, false>* relobj, | |
1488 | unsigned int local_sym_index) | |
7223e9ca ILT |
1489 | { |
1490 | if (relobj->local_has_plt_offset(local_sym_index)) | |
1491 | return; | |
1492 | if (this->plt_ == NULL) | |
1493 | this->make_plt_section(symtab, layout); | |
67181c72 ILT |
1494 | unsigned int plt_offset = this->plt_->add_local_ifunc_entry(symtab, layout, |
1495 | relobj, | |
7223e9ca ILT |
1496 | local_sym_index); |
1497 | relobj->set_local_plt_offset(local_sym_index, plt_offset); | |
1498 | } | |
1499 | ||
0e70b911 CC |
1500 | // Return the number of entries in the PLT. |
1501 | ||
fc51264f | 1502 | template<int size> |
0e70b911 | 1503 | unsigned int |
fc51264f | 1504 | Target_x86_64<size>::plt_entry_count() const |
0e70b911 CC |
1505 | { |
1506 | if (this->plt_ == NULL) | |
1507 | return 0; | |
1508 | return this->plt_->entry_count(); | |
1509 | } | |
1510 | ||
1511 | // Return the offset of the first non-reserved PLT entry. | |
1512 | ||
fc51264f | 1513 | template<int size> |
0e70b911 | 1514 | unsigned int |
fc51264f | 1515 | Target_x86_64<size>::first_plt_entry_offset() const |
0e70b911 | 1516 | { |
fc51264f | 1517 | return Output_data_plt_x86_64<size>::first_plt_entry_offset(); |
0e70b911 CC |
1518 | } |
1519 | ||
1520 | // Return the size of each PLT entry. | |
1521 | ||
fc51264f | 1522 | template<int size> |
0e70b911 | 1523 | unsigned int |
fc51264f | 1524 | Target_x86_64<size>::plt_entry_size() const |
0e70b911 | 1525 | { |
fc51264f | 1526 | return Output_data_plt_x86_64<size>::get_plt_entry_size(); |
0e70b911 CC |
1527 | } |
1528 | ||
4829d394 CC |
1529 | // Create the GOT and PLT sections for an incremental update. |
1530 | ||
fc51264f | 1531 | template<int size> |
dd74ae06 | 1532 | Output_data_got_base* |
fc51264f | 1533 | Target_x86_64<size>::init_got_plt_for_update(Symbol_table* symtab, |
4829d394 CC |
1534 | Layout* layout, |
1535 | unsigned int got_count, | |
1536 | unsigned int plt_count) | |
1537 | { | |
1538 | gold_assert(this->got_ == NULL); | |
1539 | ||
1540 | this->got_ = new Output_data_got<64, false>(got_count * 8); | |
1541 | layout->add_output_section_data(".got", elfcpp::SHT_PROGBITS, | |
1542 | (elfcpp::SHF_ALLOC | |
1543 | | elfcpp::SHF_WRITE), | |
1544 | this->got_, ORDER_RELRO_LAST, | |
1545 | true); | |
1546 | ||
1547 | // Add the three reserved entries. | |
1548 | this->got_plt_ = new Output_data_space((plt_count + 3) * 8, 8, "** GOT PLT"); | |
1549 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1550 | (elfcpp::SHF_ALLOC | |
1551 | | elfcpp::SHF_WRITE), | |
1552 | this->got_plt_, ORDER_NON_RELRO_FIRST, | |
1553 | false); | |
1554 | ||
1555 | // Define _GLOBAL_OFFSET_TABLE_ at the start of the PLT. | |
1556 | this->global_offset_table_ = | |
1557 | symtab->define_in_output_data("_GLOBAL_OFFSET_TABLE_", NULL, | |
1558 | Symbol_table::PREDEFINED, | |
1559 | this->got_plt_, | |
1560 | 0, 0, elfcpp::STT_OBJECT, | |
1561 | elfcpp::STB_LOCAL, | |
1562 | elfcpp::STV_HIDDEN, 0, | |
1563 | false, false); | |
1564 | ||
1565 | // If there are any TLSDESC relocations, they get GOT entries in | |
1566 | // .got.plt after the jump slot entries. | |
1567 | // FIXME: Get the count for TLSDESC entries. | |
1568 | this->got_tlsdesc_ = new Output_data_got<64, false>(0); | |
1569 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1570 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1571 | this->got_tlsdesc_, | |
1572 | ORDER_NON_RELRO_FIRST, false); | |
1573 | ||
67181c72 ILT |
1574 | // If there are any IRELATIVE relocations, they get GOT entries in |
1575 | // .got.plt after the jump slot and TLSDESC entries. | |
1576 | this->got_irelative_ = new Output_data_space(0, 8, "** GOT IRELATIVE PLT"); | |
1577 | layout->add_output_section_data(".got.plt", elfcpp::SHT_PROGBITS, | |
1578 | elfcpp::SHF_ALLOC | elfcpp::SHF_WRITE, | |
1579 | this->got_irelative_, | |
1580 | ORDER_NON_RELRO_FIRST, false); | |
1581 | ||
4829d394 | 1582 | // Create the PLT section. |
fc51264f L |
1583 | this->plt_ = new Output_data_plt_x86_64<size>(layout, this->got_, |
1584 | this->got_plt_, | |
1585 | this->got_irelative_, | |
1586 | plt_count); | |
4829d394 CC |
1587 | layout->add_output_section_data(".plt", elfcpp::SHT_PROGBITS, |
1588 | elfcpp::SHF_ALLOC | elfcpp::SHF_EXECINSTR, | |
1589 | this->plt_, ORDER_PLT, false); | |
1590 | ||
1591 | // Make the sh_info field of .rela.plt point to .plt. | |
1592 | Output_section* rela_plt_os = this->plt_->rela_plt()->output_section(); | |
1593 | rela_plt_os->set_info_section(this->plt_->output_section()); | |
1594 | ||
6fa2a40b CC |
1595 | // Create the rela_dyn section. |
1596 | this->rela_dyn_section(layout); | |
1597 | ||
4829d394 CC |
1598 | return this->got_; |
1599 | } | |
1600 | ||
6fa2a40b CC |
1601 | // Reserve a GOT entry for a local symbol, and regenerate any |
1602 | // necessary dynamic relocations. | |
1603 | ||
fc51264f | 1604 | template<int size> |
6fa2a40b | 1605 | void |
fc51264f | 1606 | Target_x86_64<size>::reserve_local_got_entry( |
6fa2a40b | 1607 | unsigned int got_index, |
fc51264f | 1608 | Sized_relobj<size, false>* obj, |
6fa2a40b CC |
1609 | unsigned int r_sym, |
1610 | unsigned int got_type) | |
1611 | { | |
1612 | unsigned int got_offset = got_index * 8; | |
1613 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1614 | ||
1615 | this->got_->reserve_local(got_index, obj, r_sym, got_type); | |
1616 | switch (got_type) | |
1617 | { | |
1618 | case GOT_TYPE_STANDARD: | |
1619 | if (parameters->options().output_is_position_independent()) | |
1620 | rela_dyn->add_local_relative(obj, r_sym, elfcpp::R_X86_64_RELATIVE, | |
397b129b | 1621 | this->got_, got_offset, 0, false); |
6fa2a40b CC |
1622 | break; |
1623 | case GOT_TYPE_TLS_OFFSET: | |
1624 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_TPOFF64, | |
1625 | this->got_, got_offset, 0); | |
1626 | break; | |
1627 | case GOT_TYPE_TLS_PAIR: | |
1628 | this->got_->reserve_slot(got_index + 1); | |
1629 | rela_dyn->add_local(obj, r_sym, elfcpp::R_X86_64_DTPMOD64, | |
1630 | this->got_, got_offset, 0); | |
1631 | break; | |
1632 | case GOT_TYPE_TLS_DESC: | |
1633 | gold_fatal(_("TLS_DESC not yet supported for incremental linking")); | |
1634 | // this->got_->reserve_slot(got_index + 1); | |
1635 | // rela_dyn->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
1636 | // this->got_, got_offset, 0); | |
1637 | break; | |
1638 | default: | |
1639 | gold_unreachable(); | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | // Reserve a GOT entry for a global symbol, and regenerate any | |
1644 | // necessary dynamic relocations. | |
1645 | ||
fc51264f | 1646 | template<int size> |
6fa2a40b | 1647 | void |
fc51264f L |
1648 | Target_x86_64<size>::reserve_global_got_entry(unsigned int got_index, |
1649 | Symbol* gsym, | |
1650 | unsigned int got_type) | |
6fa2a40b CC |
1651 | { |
1652 | unsigned int got_offset = got_index * 8; | |
1653 | Reloc_section* rela_dyn = this->rela_dyn_section(NULL); | |
1654 | ||
1655 | this->got_->reserve_global(got_index, gsym, got_type); | |
1656 | switch (got_type) | |
1657 | { | |
1658 | case GOT_TYPE_STANDARD: | |
1659 | if (!gsym->final_value_is_known()) | |
1660 | { | |
1661 | if (gsym->is_from_dynobj() | |
1662 | || gsym->is_undefined() | |
1663 | || gsym->is_preemptible() | |
1664 | || gsym->type() == elfcpp::STT_GNU_IFUNC) | |
1665 | rela_dyn->add_global(gsym, elfcpp::R_X86_64_GLOB_DAT, | |
1666 | this->got_, got_offset, 0); | |
1667 | else | |
1668 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, | |
1669 | this->got_, got_offset, 0); | |
1670 | } | |
1671 | break; | |
1672 | case GOT_TYPE_TLS_OFFSET: | |
1673 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TPOFF64, | |
1674 | this->got_, got_offset, 0); | |
1675 | break; | |
1676 | case GOT_TYPE_TLS_PAIR: | |
1677 | this->got_->reserve_slot(got_index + 1); | |
1678 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPMOD64, | |
1679 | this->got_, got_offset, 0); | |
1680 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_DTPOFF64, | |
1681 | this->got_, got_offset + 8, 0); | |
1682 | break; | |
1683 | case GOT_TYPE_TLS_DESC: | |
1684 | this->got_->reserve_slot(got_index + 1); | |
1685 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_TLSDESC, | |
1686 | this->got_, got_offset, 0); | |
1687 | break; | |
1688 | default: | |
1689 | gold_unreachable(); | |
1690 | } | |
1691 | } | |
1692 | ||
4829d394 CC |
1693 | // Register an existing PLT entry for a global symbol. |
1694 | ||
fc51264f | 1695 | template<int size> |
4829d394 | 1696 | void |
fc51264f L |
1697 | Target_x86_64<size>::register_global_plt_entry(Symbol_table* symtab, |
1698 | Layout* layout, | |
1699 | unsigned int plt_index, | |
1700 | Symbol* gsym) | |
4829d394 CC |
1701 | { |
1702 | gold_assert(this->plt_ != NULL); | |
1703 | gold_assert(!gsym->has_plt_offset()); | |
1704 | ||
1705 | this->plt_->reserve_slot(plt_index); | |
1706 | ||
1707 | gsym->set_plt_offset((plt_index + 1) * this->plt_entry_size()); | |
1708 | ||
1709 | unsigned int got_offset = (plt_index + 3) * 8; | |
67181c72 | 1710 | this->plt_->add_relocation(symtab, layout, gsym, got_offset); |
4829d394 CC |
1711 | } |
1712 | ||
26d3c67d CC |
1713 | // Force a COPY relocation for a given symbol. |
1714 | ||
fc51264f | 1715 | template<int size> |
26d3c67d | 1716 | void |
fc51264f | 1717 | Target_x86_64<size>::emit_copy_reloc( |
26d3c67d CC |
1718 | Symbol_table* symtab, Symbol* sym, Output_section* os, off_t offset) |
1719 | { | |
1720 | this->copy_relocs_.emit_copy_reloc(symtab, | |
fc51264f | 1721 | symtab->get_sized_symbol<size>(sym), |
26d3c67d CC |
1722 | os, |
1723 | offset, | |
1724 | this->rela_dyn_section(NULL)); | |
1725 | } | |
1726 | ||
9fa33bee | 1727 | // Define the _TLS_MODULE_BASE_ symbol in the TLS segment. |
edfbb029 | 1728 | |
fc51264f | 1729 | template<int size> |
edfbb029 | 1730 | void |
fc51264f L |
1731 | Target_x86_64<size>::define_tls_base_symbol(Symbol_table* symtab, |
1732 | Layout* layout) | |
edfbb029 CC |
1733 | { |
1734 | if (this->tls_base_symbol_defined_) | |
1735 | return; | |
1736 | ||
1737 | Output_segment* tls_segment = layout->tls_segment(); | |
1738 | if (tls_segment != NULL) | |
1739 | { | |
183fd0e3 | 1740 | bool is_exec = parameters->options().output_is_executable(); |
edfbb029 | 1741 | symtab->define_in_output_segment("_TLS_MODULE_BASE_", NULL, |
99fff23b | 1742 | Symbol_table::PREDEFINED, |
edfbb029 CC |
1743 | tls_segment, 0, 0, |
1744 | elfcpp::STT_TLS, | |
1745 | elfcpp::STB_LOCAL, | |
1746 | elfcpp::STV_HIDDEN, 0, | |
183fd0e3 AO |
1747 | (is_exec |
1748 | ? Symbol::SEGMENT_END | |
1749 | : Symbol::SEGMENT_START), | |
1750 | true); | |
edfbb029 CC |
1751 | } |
1752 | this->tls_base_symbol_defined_ = true; | |
1753 | } | |
1754 | ||
c2b45e22 CC |
1755 | // Create the reserved PLT and GOT entries for the TLS descriptor resolver. |
1756 | ||
fc51264f | 1757 | template<int size> |
c2b45e22 | 1758 | void |
fc51264f | 1759 | Target_x86_64<size>::reserve_tlsdesc_entries(Symbol_table* symtab, |
c2b45e22 CC |
1760 | Layout* layout) |
1761 | { | |
1762 | if (this->plt_ == NULL) | |
1763 | this->make_plt_section(symtab, layout); | |
1764 | ||
1765 | if (!this->plt_->has_tlsdesc_entry()) | |
1766 | { | |
1767 | // Allocate the TLSDESC_GOT entry. | |
1768 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1769 | unsigned int got_offset = got->add_constant(0); | |
1770 | ||
1771 | // Allocate the TLSDESC_PLT entry. | |
1772 | this->plt_->reserve_tlsdesc_entry(got_offset); | |
1773 | } | |
1774 | } | |
1775 | ||
31d60480 ILT |
1776 | // Create a GOT entry for the TLS module index. |
1777 | ||
fc51264f | 1778 | template<int size> |
31d60480 | 1779 | unsigned int |
fc51264f L |
1780 | Target_x86_64<size>::got_mod_index_entry(Symbol_table* symtab, Layout* layout, |
1781 | Sized_relobj_file<size, false>* object) | |
31d60480 ILT |
1782 | { |
1783 | if (this->got_mod_index_offset_ == -1U) | |
1784 | { | |
1785 | gold_assert(symtab != NULL && layout != NULL && object != NULL); | |
1786 | Reloc_section* rela_dyn = this->rela_dyn_section(layout); | |
1787 | Output_data_got<64, false>* got = this->got_section(symtab, layout); | |
1788 | unsigned int got_offset = got->add_constant(0); | |
1789 | rela_dyn->add_local(object, 0, elfcpp::R_X86_64_DTPMOD64, got, | |
1790 | got_offset, 0); | |
009a67a2 | 1791 | got->add_constant(0); |
31d60480 ILT |
1792 | this->got_mod_index_offset_ = got_offset; |
1793 | } | |
1794 | return this->got_mod_index_offset_; | |
1795 | } | |
1796 | ||
2e30d253 ILT |
1797 | // Optimize the TLS relocation type based on what we know about the |
1798 | // symbol. IS_FINAL is true if the final address of this symbol is | |
1799 | // known at link time. | |
1800 | ||
fc51264f | 1801 | template<int size> |
e041f13d | 1802 | tls::Tls_optimization |
fc51264f | 1803 | Target_x86_64<size>::optimize_tls_reloc(bool is_final, int r_type) |
2e30d253 | 1804 | { |
2e30d253 ILT |
1805 | // If we are generating a shared library, then we can't do anything |
1806 | // in the linker. | |
8851ecca | 1807 | if (parameters->options().shared()) |
e041f13d | 1808 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1809 | |
1810 | switch (r_type) | |
1811 | { | |
1812 | case elfcpp::R_X86_64_TLSGD: | |
e041f13d ILT |
1813 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
1814 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1815 | // These are General-Dynamic which permits fully general TLS | |
2e30d253 ILT |
1816 | // access. Since we know that we are generating an executable, |
1817 | // we can convert this to Initial-Exec. If we also know that | |
1818 | // this is a local symbol, we can further switch to Local-Exec. | |
1819 | if (is_final) | |
e041f13d ILT |
1820 | return tls::TLSOPT_TO_LE; |
1821 | return tls::TLSOPT_TO_IE; | |
2e30d253 | 1822 | |
d61c17ea | 1823 | case elfcpp::R_X86_64_TLSLD: |
2e30d253 ILT |
1824 | // This is Local-Dynamic, which refers to a local symbol in the |
1825 | // dynamic TLS block. Since we know that we generating an | |
1826 | // executable, we can switch to Local-Exec. | |
e041f13d | 1827 | return tls::TLSOPT_TO_LE; |
2e30d253 | 1828 | |
0ffd9845 | 1829 | case elfcpp::R_X86_64_DTPOFF32: |
0ffd9845 ILT |
1830 | case elfcpp::R_X86_64_DTPOFF64: |
1831 | // Another Local-Dynamic reloc. | |
e041f13d | 1832 | return tls::TLSOPT_TO_LE; |
0ffd9845 | 1833 | |
d61c17ea | 1834 | case elfcpp::R_X86_64_GOTTPOFF: |
2e30d253 ILT |
1835 | // These are Initial-Exec relocs which get the thread offset |
1836 | // from the GOT. If we know that we are linking against the | |
1837 | // local symbol, we can switch to Local-Exec, which links the | |
1838 | // thread offset into the instruction. | |
1839 | if (is_final) | |
e041f13d ILT |
1840 | return tls::TLSOPT_TO_LE; |
1841 | return tls::TLSOPT_NONE; | |
2e30d253 | 1842 | |
d61c17ea | 1843 | case elfcpp::R_X86_64_TPOFF32: |
2e30d253 ILT |
1844 | // When we already have Local-Exec, there is nothing further we |
1845 | // can do. | |
e041f13d | 1846 | return tls::TLSOPT_NONE; |
2e30d253 ILT |
1847 | |
1848 | default: | |
1849 | gold_unreachable(); | |
1850 | } | |
2e30d253 ILT |
1851 | } |
1852 | ||
95a2c8d6 RS |
1853 | // Get the Reference_flags for a particular relocation. |
1854 | ||
fc51264f | 1855 | template<int size> |
95a2c8d6 | 1856 | int |
fc51264f | 1857 | Target_x86_64<size>::Scan::get_reference_flags(unsigned int r_type) |
95a2c8d6 RS |
1858 | { |
1859 | switch (r_type) | |
1860 | { | |
1861 | case elfcpp::R_X86_64_NONE: | |
1862 | case elfcpp::R_X86_64_GNU_VTINHERIT: | |
1863 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
1864 | case elfcpp::R_X86_64_GOTPC32: | |
1865 | case elfcpp::R_X86_64_GOTPC64: | |
1866 | // No symbol reference. | |
1867 | return 0; | |
1868 | ||
1869 | case elfcpp::R_X86_64_64: | |
1870 | case elfcpp::R_X86_64_32: | |
1871 | case elfcpp::R_X86_64_32S: | |
1872 | case elfcpp::R_X86_64_16: | |
1873 | case elfcpp::R_X86_64_8: | |
1874 | return Symbol::ABSOLUTE_REF; | |
1875 | ||
1876 | case elfcpp::R_X86_64_PC64: | |
1877 | case elfcpp::R_X86_64_PC32: | |
1878 | case elfcpp::R_X86_64_PC16: | |
1879 | case elfcpp::R_X86_64_PC8: | |
1880 | case elfcpp::R_X86_64_GOTOFF64: | |
1881 | return Symbol::RELATIVE_REF; | |
1882 | ||
1883 | case elfcpp::R_X86_64_PLT32: | |
1884 | case elfcpp::R_X86_64_PLTOFF64: | |
1885 | return Symbol::FUNCTION_CALL | Symbol::RELATIVE_REF; | |
1886 | ||
1887 | case elfcpp::R_X86_64_GOT64: | |
1888 | case elfcpp::R_X86_64_GOT32: | |
1889 | case elfcpp::R_X86_64_GOTPCREL64: | |
1890 | case elfcpp::R_X86_64_GOTPCREL: | |
1891 | case elfcpp::R_X86_64_GOTPLT64: | |
1892 | // Absolute in GOT. | |
1893 | return Symbol::ABSOLUTE_REF; | |
1894 | ||
1895 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic | |
1896 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
1897 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
1898 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
1899 | case elfcpp::R_X86_64_DTPOFF32: | |
1900 | case elfcpp::R_X86_64_DTPOFF64: | |
1901 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
1902 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
1903 | return Symbol::TLS_REF; | |
1904 | ||
1905 | case elfcpp::R_X86_64_COPY: | |
1906 | case elfcpp::R_X86_64_GLOB_DAT: | |
1907 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1908 | case elfcpp::R_X86_64_RELATIVE: | |
1909 | case elfcpp::R_X86_64_IRELATIVE: | |
1910 | case elfcpp::R_X86_64_TPOFF64: | |
1911 | case elfcpp::R_X86_64_DTPMOD64: | |
1912 | case elfcpp::R_X86_64_TLSDESC: | |
1913 | case elfcpp::R_X86_64_SIZE32: | |
1914 | case elfcpp::R_X86_64_SIZE64: | |
1915 | default: | |
1916 | // Not expected. We will give an error later. | |
1917 | return 0; | |
1918 | } | |
1919 | } | |
1920 | ||
e041f13d ILT |
1921 | // Report an unsupported relocation against a local symbol. |
1922 | ||
fc51264f | 1923 | template<int size> |
e041f13d | 1924 | void |
fc51264f L |
1925 | Target_x86_64<size>::Scan::unsupported_reloc_local( |
1926 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 1927 | unsigned int r_type) |
e041f13d | 1928 | { |
75f2446e ILT |
1929 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
1930 | object->name().c_str(), r_type); | |
e041f13d ILT |
1931 | } |
1932 | ||
a036edd8 ILT |
1933 | // We are about to emit a dynamic relocation of type R_TYPE. If the |
1934 | // dynamic linker does not support it, issue an error. The GNU linker | |
1935 | // only issues a non-PIC error for an allocated read-only section. | |
1936 | // Here we know the section is allocated, but we don't know that it is | |
1937 | // read-only. But we check for all the relocation types which the | |
1938 | // glibc dynamic linker supports, so it seems appropriate to issue an | |
a29b0dad ILT |
1939 | // error even if the section is not read-only. If GSYM is not NULL, |
1940 | // it is the symbol the relocation is against; if it is NULL, the | |
1941 | // relocation is against a local symbol. | |
a036edd8 | 1942 | |
fc51264f | 1943 | template<int size> |
a036edd8 | 1944 | void |
fc51264f L |
1945 | Target_x86_64<size>::Scan::check_non_pic(Relobj* object, unsigned int r_type, |
1946 | Symbol* gsym) | |
a036edd8 ILT |
1947 | { |
1948 | switch (r_type) | |
1949 | { | |
2fbb4320 ILT |
1950 | // These are the relocation types supported by glibc for x86_64 |
1951 | // which should always work. | |
a036edd8 | 1952 | case elfcpp::R_X86_64_RELATIVE: |
7223e9ca | 1953 | case elfcpp::R_X86_64_IRELATIVE: |
a036edd8 ILT |
1954 | case elfcpp::R_X86_64_GLOB_DAT: |
1955 | case elfcpp::R_X86_64_JUMP_SLOT: | |
1956 | case elfcpp::R_X86_64_DTPMOD64: | |
1957 | case elfcpp::R_X86_64_DTPOFF64: | |
1958 | case elfcpp::R_X86_64_TPOFF64: | |
1959 | case elfcpp::R_X86_64_64: | |
2fbb4320 ILT |
1960 | case elfcpp::R_X86_64_COPY: |
1961 | return; | |
1962 | ||
1963 | // glibc supports these reloc types, but they can overflow. | |
a036edd8 | 1964 | case elfcpp::R_X86_64_PC32: |
a29b0dad ILT |
1965 | // A PC relative reference is OK against a local symbol or if |
1966 | // the symbol is defined locally. | |
1967 | if (gsym == NULL | |
1968 | || (!gsym->is_from_dynobj() | |
1969 | && !gsym->is_undefined() | |
1970 | && !gsym->is_preemptible())) | |
1971 | return; | |
1972 | /* Fall through. */ | |
1973 | case elfcpp::R_X86_64_32: | |
2fbb4320 ILT |
1974 | if (this->issued_non_pic_error_) |
1975 | return; | |
1976 | gold_assert(parameters->options().output_is_position_independent()); | |
a29b0dad ILT |
1977 | if (gsym == NULL) |
1978 | object->error(_("requires dynamic R_X86_64_32 reloc which may " | |
1979 | "overflow at runtime; recompile with -fPIC")); | |
1980 | else | |
1981 | object->error(_("requires dynamic %s reloc against '%s' which may " | |
1982 | "overflow at runtime; recompile with -fPIC"), | |
1983 | (r_type == elfcpp::R_X86_64_32 | |
1984 | ? "R_X86_64_32" | |
1985 | : "R_X86_64_PC32"), | |
1986 | gsym->name()); | |
2fbb4320 | 1987 | this->issued_non_pic_error_ = true; |
a036edd8 ILT |
1988 | return; |
1989 | ||
1990 | default: | |
1991 | // This prevents us from issuing more than one error per reloc | |
1992 | // section. But we can still wind up issuing more than one | |
1993 | // error per object file. | |
1994 | if (this->issued_non_pic_error_) | |
1995 | return; | |
33aea2fd | 1996 | gold_assert(parameters->options().output_is_position_independent()); |
a29b0dad ILT |
1997 | object->error(_("requires unsupported dynamic reloc %u; " |
1998 | "recompile with -fPIC"), | |
1999 | r_type); | |
a036edd8 ILT |
2000 | this->issued_non_pic_error_ = true; |
2001 | return; | |
2002 | ||
2003 | case elfcpp::R_X86_64_NONE: | |
2004 | gold_unreachable(); | |
2005 | } | |
2006 | } | |
2007 | ||
7223e9ca ILT |
2008 | // Return whether we need to make a PLT entry for a relocation of the |
2009 | // given type against a STT_GNU_IFUNC symbol. | |
2010 | ||
fc51264f | 2011 | template<int size> |
7223e9ca | 2012 | bool |
fc51264f L |
2013 | Target_x86_64<size>::Scan::reloc_needs_plt_for_ifunc( |
2014 | Sized_relobj_file<size, false>* object, | |
6fa2a40b | 2015 | unsigned int r_type) |
7223e9ca | 2016 | { |
95a2c8d6 RS |
2017 | int flags = Scan::get_reference_flags(r_type); |
2018 | if (flags & Symbol::TLS_REF) | |
2019 | gold_error(_("%s: unsupported TLS reloc %u for IFUNC symbol"), | |
2020 | object->name().c_str(), r_type); | |
2021 | return flags != 0; | |
7223e9ca ILT |
2022 | } |
2023 | ||
2e30d253 ILT |
2024 | // Scan a relocation for a local symbol. |
2025 | ||
fc51264f | 2026 | template<int size> |
2e30d253 | 2027 | inline void |
fc51264f L |
2028 | Target_x86_64<size>::Scan::local(Symbol_table* symtab, |
2029 | Layout* layout, | |
2030 | Target_x86_64<size>* target, | |
2031 | Sized_relobj_file<size, false>* object, | |
2032 | unsigned int data_shndx, | |
2033 | Output_section* output_section, | |
2034 | const elfcpp::Rela<size, false>& reloc, | |
2035 | unsigned int r_type, | |
2036 | const elfcpp::Sym<size, false>& lsym) | |
2e30d253 | 2037 | { |
7223e9ca | 2038 | // A local STT_GNU_IFUNC symbol may require a PLT entry. |
397b129b CC |
2039 | bool is_ifunc = lsym.get_st_type() == elfcpp::STT_GNU_IFUNC; |
2040 | if (is_ifunc && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
7223e9ca | 2041 | { |
fc51264f | 2042 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2043 | target->make_local_ifunc_plt_entry(symtab, layout, object, r_sym); |
2044 | } | |
2045 | ||
2e30d253 ILT |
2046 | switch (r_type) |
2047 | { | |
2048 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2049 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2050 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2051 | break; |
2052 | ||
2053 | case elfcpp::R_X86_64_64: | |
d61c6bd4 | 2054 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2055 | // executable), we need to create a dynamic relocation for this |
2056 | // location. The relocation applied at link time will apply the | |
2057 | // link-time value, so we flag the location with an | |
2058 | // R_X86_64_RELATIVE relocation so the dynamic loader can | |
d61c6bd4 | 2059 | // relocate it easily. |
8851ecca | 2060 | if (parameters->options().output_is_position_independent()) |
d61c6bd4 | 2061 | { |
fc51264f | 2062 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
d61c6bd4 | 2063 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
7223e9ca ILT |
2064 | rela_dyn->add_local_relative(object, r_sym, |
2065 | elfcpp::R_X86_64_RELATIVE, | |
2066 | output_section, data_shndx, | |
2067 | reloc.get_r_offset(), | |
397b129b | 2068 | reloc.get_r_addend(), is_ifunc); |
d61c6bd4 ILT |
2069 | } |
2070 | break; | |
2071 | ||
2e30d253 ILT |
2072 | case elfcpp::R_X86_64_32: |
2073 | case elfcpp::R_X86_64_32S: | |
2074 | case elfcpp::R_X86_64_16: | |
2075 | case elfcpp::R_X86_64_8: | |
96f2030e | 2076 | // If building a shared library (or a position-independent |
dceae3c1 ILT |
2077 | // executable), we need to create a dynamic relocation for this |
2078 | // location. We can't use an R_X86_64_RELATIVE relocation | |
2079 | // because that is always a 64-bit relocation. | |
8851ecca | 2080 | if (parameters->options().output_is_position_independent()) |
96f2030e | 2081 | { |
a29b0dad | 2082 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 2083 | |
96f2030e | 2084 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
fc51264f | 2085 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
dceae3c1 | 2086 | if (lsym.get_st_type() != elfcpp::STT_SECTION) |
d491d34e ILT |
2087 | rela_dyn->add_local(object, r_sym, r_type, output_section, |
2088 | data_shndx, reloc.get_r_offset(), | |
2089 | reloc.get_r_addend()); | |
dceae3c1 ILT |
2090 | else |
2091 | { | |
2092 | gold_assert(lsym.get_st_value() == 0); | |
d491d34e ILT |
2093 | unsigned int shndx = lsym.get_st_shndx(); |
2094 | bool is_ordinary; | |
2095 | shndx = object->adjust_sym_shndx(r_sym, shndx, | |
2096 | &is_ordinary); | |
2097 | if (!is_ordinary) | |
2098 | object->error(_("section symbol %u has bad shndx %u"), | |
2099 | r_sym, shndx); | |
2100 | else | |
2101 | rela_dyn->add_local_section(object, shndx, | |
2102 | r_type, output_section, | |
2103 | data_shndx, reloc.get_r_offset(), | |
2104 | reloc.get_r_addend()); | |
dceae3c1 | 2105 | } |
96f2030e | 2106 | } |
2e30d253 ILT |
2107 | break; |
2108 | ||
2109 | case elfcpp::R_X86_64_PC64: | |
2110 | case elfcpp::R_X86_64_PC32: | |
2111 | case elfcpp::R_X86_64_PC16: | |
2112 | case elfcpp::R_X86_64_PC8: | |
2113 | break; | |
2114 | ||
f389a824 ILT |
2115 | case elfcpp::R_X86_64_PLT32: |
2116 | // Since we know this is a local symbol, we can handle this as a | |
2117 | // PC32 reloc. | |
2118 | break; | |
2119 | ||
fdc2f80f | 2120 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2121 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2122 | case elfcpp::R_X86_64_GOTPC64: |
2123 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2124 | // We need a GOT section. |
2125 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2126 | // For PLTOFF64, we'd normally want a PLT section, but since we |
2127 | // know this is a local symbol, no PLT is needed. | |
2e30d253 ILT |
2128 | break; |
2129 | ||
0ffd9845 ILT |
2130 | case elfcpp::R_X86_64_GOT64: |
2131 | case elfcpp::R_X86_64_GOT32: | |
2132 | case elfcpp::R_X86_64_GOTPCREL64: | |
2133 | case elfcpp::R_X86_64_GOTPCREL: | |
ee9e9e86 | 2134 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 ILT |
2135 | { |
2136 | // The symbol requires a GOT entry. | |
2137 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
fc51264f | 2138 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
7223e9ca ILT |
2139 | |
2140 | // For a STT_GNU_IFUNC symbol we want the PLT offset. That | |
2141 | // lets function pointers compare correctly with shared | |
2142 | // libraries. Otherwise we would need an IRELATIVE reloc. | |
2143 | bool is_new; | |
397b129b | 2144 | if (is_ifunc) |
7223e9ca ILT |
2145 | is_new = got->add_local_plt(object, r_sym, GOT_TYPE_STANDARD); |
2146 | else | |
2147 | is_new = got->add_local(object, r_sym, GOT_TYPE_STANDARD); | |
2148 | if (is_new) | |
0ffd9845 ILT |
2149 | { |
2150 | // If we are generating a shared object, we need to add a | |
7bf1f802 | 2151 | // dynamic relocation for this symbol's GOT entry. |
8851ecca | 2152 | if (parameters->options().output_is_position_independent()) |
0ffd9845 ILT |
2153 | { |
2154 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7bf1f802 ILT |
2155 | // R_X86_64_RELATIVE assumes a 64-bit relocation. |
2156 | if (r_type != elfcpp::R_X86_64_GOT32) | |
7223e9ca ILT |
2157 | { |
2158 | unsigned int got_offset = | |
2159 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD); | |
2160 | rela_dyn->add_local_relative(object, r_sym, | |
2161 | elfcpp::R_X86_64_RELATIVE, | |
397b129b | 2162 | got, got_offset, 0, is_ifunc); |
7223e9ca | 2163 | } |
7bf1f802 | 2164 | else |
dceae3c1 | 2165 | { |
a29b0dad | 2166 | this->check_non_pic(object, r_type, NULL); |
a036edd8 | 2167 | |
dceae3c1 | 2168 | gold_assert(lsym.get_st_type() != elfcpp::STT_SECTION); |
0a65a3a7 CC |
2169 | rela_dyn->add_local( |
2170 | object, r_sym, r_type, got, | |
2171 | object->local_got_offset(r_sym, GOT_TYPE_STANDARD), 0); | |
dceae3c1 | 2172 | } |
0ffd9845 ILT |
2173 | } |
2174 | } | |
ee9e9e86 ILT |
2175 | // For GOTPLT64, we'd normally want a PLT section, but since |
2176 | // we know this is a local symbol, no PLT is needed. | |
0ffd9845 ILT |
2177 | } |
2178 | break; | |
2179 | ||
2e30d253 ILT |
2180 | case elfcpp::R_X86_64_COPY: |
2181 | case elfcpp::R_X86_64_GLOB_DAT: | |
2182 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2183 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2184 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2185 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 2186 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2187 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 2188 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2189 | gold_error(_("%s: unexpected reloc %u in object file"), |
2190 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2191 | break; |
2192 | ||
d61c17ea | 2193 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
2194 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2195 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2196 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2197 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2198 | case elfcpp::R_X86_64_DTPOFF32: |
2199 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2200 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2201 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 | 2202 | { |
8851ecca | 2203 | bool output_is_shared = parameters->options().shared(); |
e041f13d | 2204 | const tls::Tls_optimization optimized_type |
fc51264f L |
2205 | = Target_x86_64<size>::optimize_tls_reloc(!output_is_shared, |
2206 | r_type); | |
2e30d253 ILT |
2207 | switch (r_type) |
2208 | { | |
56622147 | 2209 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
2210 | if (optimized_type == tls::TLSOPT_NONE) |
2211 | { | |
2212 | // Create a pair of GOT entries for the module index and | |
2213 | // dtv-relative offset. | |
2214 | Output_data_got<64, false>* got | |
2215 | = target->got_section(symtab, layout); | |
fc51264f | 2216 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
d491d34e ILT |
2217 | unsigned int shndx = lsym.get_st_shndx(); |
2218 | bool is_ordinary; | |
2219 | shndx = object->adjust_sym_shndx(r_sym, shndx, &is_ordinary); | |
2220 | if (!is_ordinary) | |
2221 | object->error(_("local symbol %u has bad shndx %u"), | |
2222 | r_sym, shndx); | |
2223 | else | |
83896202 ILT |
2224 | got->add_local_pair_with_rel(object, r_sym, |
2225 | shndx, | |
2226 | GOT_TYPE_TLS_PAIR, | |
2227 | target->rela_dyn_section(layout), | |
2228 | elfcpp::R_X86_64_DTPMOD64, 0); | |
7bf1f802 ILT |
2229 | } |
2230 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2231 | unsupported_reloc_local(object, r_type); | |
2232 | break; | |
2233 | ||
56622147 | 2234 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 2235 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2236 | if (optimized_type == tls::TLSOPT_NONE) |
2237 | { | |
2238 | // Create reserved PLT and GOT entries for the resolver. | |
2239 | target->reserve_tlsdesc_entries(symtab, layout); | |
2240 | ||
a8df5856 ILT |
2241 | // Generate a double GOT entry with an |
2242 | // R_X86_64_TLSDESC reloc. The R_X86_64_TLSDESC reloc | |
2243 | // is resolved lazily, so the GOT entry needs to be in | |
2244 | // an area in .got.plt, not .got. Call got_section to | |
2245 | // make sure the section has been created. | |
2246 | target->got_section(symtab, layout); | |
2247 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
fc51264f | 2248 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
e291e7b9 ILT |
2249 | if (!object->local_has_got_offset(r_sym, GOT_TYPE_TLS_DESC)) |
2250 | { | |
2251 | unsigned int got_offset = got->add_constant(0); | |
2252 | got->add_constant(0); | |
2253 | object->set_local_got_offset(r_sym, GOT_TYPE_TLS_DESC, | |
2254 | got_offset); | |
2255 | Reloc_section* rt = target->rela_tlsdesc_section(layout); | |
2256 | // We store the arguments we need in a vector, and | |
2257 | // use the index into the vector as the parameter | |
2258 | // to pass to the target specific routines. | |
2259 | uintptr_t intarg = target->add_tlsdesc_info(object, r_sym); | |
2260 | void* arg = reinterpret_cast<void*>(intarg); | |
2261 | rt->add_target_specific(elfcpp::R_X86_64_TLSDESC, arg, | |
2262 | got, got_offset, 0); | |
2263 | } | |
c2b45e22 CC |
2264 | } |
2265 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2266 | unsupported_reloc_local(object, r_type); |
2e30d253 ILT |
2267 | break; |
2268 | ||
c2b45e22 CC |
2269 | case elfcpp::R_X86_64_TLSDESC_CALL: |
2270 | break; | |
2271 | ||
e041f13d | 2272 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2273 | if (optimized_type == tls::TLSOPT_NONE) |
2274 | { | |
2275 | // Create a GOT entry for the module index. | |
31d60480 | 2276 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
2277 | } |
2278 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2279 | unsupported_reloc_local(object, r_type); | |
2280 | break; | |
2281 | ||
0ffd9845 ILT |
2282 | case elfcpp::R_X86_64_DTPOFF32: |
2283 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2284 | break; |
2285 | ||
56622147 | 2286 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2287 | layout->set_has_static_tls(); |
7bf1f802 ILT |
2288 | if (optimized_type == tls::TLSOPT_NONE) |
2289 | { | |
2290 | // Create a GOT entry for the tp-relative offset. | |
2291 | Output_data_got<64, false>* got | |
2292 | = target->got_section(symtab, layout); | |
fc51264f | 2293 | unsigned int r_sym = elfcpp::elf_r_sym<size>(reloc.get_r_info()); |
83896202 ILT |
2294 | got->add_local_with_rel(object, r_sym, GOT_TYPE_TLS_OFFSET, |
2295 | target->rela_dyn_section(layout), | |
2296 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
2297 | } |
2298 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
2299 | unsupported_reloc_local(object, r_type); |
2300 | break; | |
0ffd9845 | 2301 | |
56622147 | 2302 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2303 | layout->set_has_static_tls(); |
7bf1f802 ILT |
2304 | if (output_is_shared) |
2305 | unsupported_reloc_local(object, r_type); | |
2e30d253 | 2306 | break; |
e041f13d ILT |
2307 | |
2308 | default: | |
2309 | gold_unreachable(); | |
2e30d253 ILT |
2310 | } |
2311 | } | |
2312 | break; | |
2e30d253 | 2313 | |
fdc2f80f ILT |
2314 | case elfcpp::R_X86_64_SIZE32: |
2315 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2316 | default: |
75f2446e ILT |
2317 | gold_error(_("%s: unsupported reloc %u against local symbol"), |
2318 | object->name().c_str(), r_type); | |
2e30d253 ILT |
2319 | break; |
2320 | } | |
2321 | } | |
2322 | ||
2323 | ||
e041f13d ILT |
2324 | // Report an unsupported relocation against a global symbol. |
2325 | ||
fc51264f | 2326 | template<int size> |
e041f13d | 2327 | void |
fc51264f L |
2328 | Target_x86_64<size>::Scan::unsupported_reloc_global( |
2329 | Sized_relobj_file<size, false>* object, | |
6fa2a40b CC |
2330 | unsigned int r_type, |
2331 | Symbol* gsym) | |
e041f13d | 2332 | { |
75f2446e | 2333 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 | 2334 | object->name().c_str(), r_type, gsym->demangled_name().c_str()); |
e041f13d ILT |
2335 | } |
2336 | ||
ce97fa81 | 2337 | // Returns true if this relocation type could be that of a function pointer. |
fc51264f | 2338 | template<int size> |
21bb3914 | 2339 | inline bool |
fc51264f | 2340 | Target_x86_64<size>::Scan::possible_function_pointer_reloc(unsigned int r_type) |
21bb3914 | 2341 | { |
21bb3914 ST |
2342 | switch (r_type) |
2343 | { | |
2344 | case elfcpp::R_X86_64_64: | |
2345 | case elfcpp::R_X86_64_32: | |
2346 | case elfcpp::R_X86_64_32S: | |
2347 | case elfcpp::R_X86_64_16: | |
2348 | case elfcpp::R_X86_64_8: | |
ce97fa81 ST |
2349 | case elfcpp::R_X86_64_GOT64: |
2350 | case elfcpp::R_X86_64_GOT32: | |
2351 | case elfcpp::R_X86_64_GOTPCREL64: | |
2352 | case elfcpp::R_X86_64_GOTPCREL: | |
2353 | case elfcpp::R_X86_64_GOTPLT64: | |
21bb3914 ST |
2354 | { |
2355 | return true; | |
2356 | } | |
2357 | } | |
2358 | return false; | |
2359 | } | |
2360 | ||
2361 | // For safe ICF, scan a relocation for a local symbol to check if it | |
2362 | // corresponds to a function pointer being taken. In that case mark | |
2363 | // the function whose pointer was taken as not foldable. | |
2364 | ||
fc51264f | 2365 | template<int size> |
21bb3914 | 2366 | inline bool |
fc51264f | 2367 | Target_x86_64<size>::Scan::local_reloc_may_be_function_pointer( |
21bb3914 ST |
2368 | Symbol_table* , |
2369 | Layout* , | |
fc51264f L |
2370 | Target_x86_64<size>* , |
2371 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2372 | unsigned int , |
2373 | Output_section* , | |
fc51264f | 2374 | const elfcpp::Rela<size, false>& , |
21bb3914 | 2375 | unsigned int r_type, |
fc51264f | 2376 | const elfcpp::Sym<size, false>&) |
21bb3914 ST |
2377 | { |
2378 | // When building a shared library, do not fold any local symbols as it is | |
2379 | // not possible to distinguish pointer taken versus a call by looking at | |
2380 | // the relocation types. | |
2381 | return (parameters->options().shared() | |
2382 | || possible_function_pointer_reloc(r_type)); | |
2383 | } | |
2384 | ||
2385 | // For safe ICF, scan a relocation for a global symbol to check if it | |
2386 | // corresponds to a function pointer being taken. In that case mark | |
2387 | // the function whose pointer was taken as not foldable. | |
2388 | ||
fc51264f | 2389 | template<int size> |
21bb3914 | 2390 | inline bool |
fc51264f | 2391 | Target_x86_64<size>::Scan::global_reloc_may_be_function_pointer( |
21bb3914 ST |
2392 | Symbol_table*, |
2393 | Layout* , | |
fc51264f L |
2394 | Target_x86_64<size>* , |
2395 | Sized_relobj_file<size, false>* , | |
21bb3914 ST |
2396 | unsigned int , |
2397 | Output_section* , | |
fc51264f | 2398 | const elfcpp::Rela<size, false>& , |
21bb3914 ST |
2399 | unsigned int r_type, |
2400 | Symbol* gsym) | |
2401 | { | |
2402 | // When building a shared library, do not fold symbols whose visibility | |
2403 | // is hidden, internal or protected. | |
2404 | return ((parameters->options().shared() | |
2405 | && (gsym->visibility() == elfcpp::STV_INTERNAL | |
2406 | || gsym->visibility() == elfcpp::STV_PROTECTED | |
2407 | || gsym->visibility() == elfcpp::STV_HIDDEN)) | |
2408 | || possible_function_pointer_reloc(r_type)); | |
2409 | } | |
2410 | ||
2e30d253 ILT |
2411 | // Scan a relocation for a global symbol. |
2412 | ||
fc51264f | 2413 | template<int size> |
2e30d253 | 2414 | inline void |
fc51264f | 2415 | Target_x86_64<size>::Scan::global(Symbol_table* symtab, |
d61c17ea | 2416 | Layout* layout, |
fc51264f L |
2417 | Target_x86_64<size>* target, |
2418 | Sized_relobj_file<size, false>* object, | |
d61c17ea | 2419 | unsigned int data_shndx, |
4f4c5f80 | 2420 | Output_section* output_section, |
fc51264f | 2421 | const elfcpp::Rela<size, false>& reloc, |
d61c17ea ILT |
2422 | unsigned int r_type, |
2423 | Symbol* gsym) | |
2e30d253 | 2424 | { |
7223e9ca ILT |
2425 | // A STT_GNU_IFUNC symbol may require a PLT entry. |
2426 | if (gsym->type() == elfcpp::STT_GNU_IFUNC | |
2427 | && this->reloc_needs_plt_for_ifunc(object, r_type)) | |
2428 | target->make_plt_entry(symtab, layout, gsym); | |
2429 | ||
2e30d253 ILT |
2430 | switch (r_type) |
2431 | { | |
2432 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
2433 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
2434 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
2435 | break; |
2436 | ||
2437 | case elfcpp::R_X86_64_64: | |
2e30d253 ILT |
2438 | case elfcpp::R_X86_64_32: |
2439 | case elfcpp::R_X86_64_32S: | |
2e30d253 | 2440 | case elfcpp::R_X86_64_16: |
2e30d253 | 2441 | case elfcpp::R_X86_64_8: |
96f2030e | 2442 | { |
d61c6bd4 ILT |
2443 | // Make a PLT entry if necessary. |
2444 | if (gsym->needs_plt_entry()) | |
2445 | { | |
2446 | target->make_plt_entry(symtab, layout, gsym); | |
2447 | // Since this is not a PC-relative relocation, we may be | |
2448 | // taking the address of a function. In that case we need to | |
2449 | // set the entry in the dynamic symbol table to the address of | |
2450 | // the PLT entry. | |
8851ecca | 2451 | if (gsym->is_from_dynobj() && !parameters->options().shared()) |
d61c6bd4 ILT |
2452 | gsym->set_needs_dynsym_value(); |
2453 | } | |
2454 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 2455 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
d61c6bd4 | 2456 | { |
966d4097 | 2457 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 2458 | { |
12c0daef | 2459 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 2460 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 2461 | } |
7223e9ca ILT |
2462 | else if (r_type == elfcpp::R_X86_64_64 |
2463 | && gsym->type() == elfcpp::STT_GNU_IFUNC | |
2464 | && gsym->can_use_relative_reloc(false) | |
2465 | && !gsym->is_from_dynobj() | |
2466 | && !gsym->is_undefined() | |
2467 | && !gsym->is_preemptible()) | |
2468 | { | |
2469 | // Use an IRELATIVE reloc for a locally defined | |
2470 | // STT_GNU_IFUNC symbol. This makes a function | |
2471 | // address in a PIE executable match the address in a | |
2472 | // shared library that it links against. | |
67181c72 ILT |
2473 | Reloc_section* rela_dyn = |
2474 | target->rela_irelative_section(layout); | |
7223e9ca ILT |
2475 | unsigned int r_type = elfcpp::R_X86_64_IRELATIVE; |
2476 | rela_dyn->add_symbolless_global_addend(gsym, r_type, | |
2477 | output_section, object, | |
2478 | data_shndx, | |
2479 | reloc.get_r_offset(), | |
2480 | reloc.get_r_addend()); | |
2481 | } | |
d61c6bd4 ILT |
2482 | else if (r_type == elfcpp::R_X86_64_64 |
2483 | && gsym->can_use_relative_reloc(false)) | |
2484 | { | |
2485 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); | |
7223e9ca ILT |
2486 | rela_dyn->add_global_relative(gsym, elfcpp::R_X86_64_RELATIVE, |
2487 | output_section, object, | |
2488 | data_shndx, | |
2489 | reloc.get_r_offset(), | |
2490 | reloc.get_r_addend()); | |
d61c6bd4 ILT |
2491 | } |
2492 | else | |
2493 | { | |
a29b0dad | 2494 | this->check_non_pic(object, r_type, gsym); |
96f2030e | 2495 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
2496 | rela_dyn->add_global(gsym, r_type, output_section, object, |
2497 | data_shndx, reloc.get_r_offset(), | |
96f2030e | 2498 | reloc.get_r_addend()); |
d61c6bd4 ILT |
2499 | } |
2500 | } | |
2501 | } | |
2502 | break; | |
2503 | ||
2504 | case elfcpp::R_X86_64_PC64: | |
2505 | case elfcpp::R_X86_64_PC32: | |
2506 | case elfcpp::R_X86_64_PC16: | |
2507 | case elfcpp::R_X86_64_PC8: | |
2508 | { | |
2509 | // Make a PLT entry if necessary. | |
2510 | if (gsym->needs_plt_entry()) | |
2511 | target->make_plt_entry(symtab, layout, gsym); | |
2512 | // Make a dynamic relocation if necessary. | |
95a2c8d6 | 2513 | if (gsym->needs_dynamic_reloc(Scan::get_reference_flags(r_type))) |
86849f1f | 2514 | { |
966d4097 | 2515 | if (gsym->may_need_copy_reloc()) |
d61c6bd4 | 2516 | { |
12c0daef | 2517 | target->copy_reloc(symtab, layout, object, |
7bf1f802 | 2518 | data_shndx, output_section, gsym, reloc); |
d61c6bd4 | 2519 | } |
86849f1f | 2520 | else |
d61c6bd4 | 2521 | { |
a29b0dad | 2522 | this->check_non_pic(object, r_type, gsym); |
d61c6bd4 | 2523 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
4f4c5f80 ILT |
2524 | rela_dyn->add_global(gsym, r_type, output_section, object, |
2525 | data_shndx, reloc.get_r_offset(), | |
d61c6bd4 ILT |
2526 | reloc.get_r_addend()); |
2527 | } | |
86849f1f | 2528 | } |
d61c6bd4 | 2529 | } |
2e30d253 ILT |
2530 | break; |
2531 | ||
ff006520 | 2532 | case elfcpp::R_X86_64_GOT64: |
2e30d253 | 2533 | case elfcpp::R_X86_64_GOT32: |
ff006520 ILT |
2534 | case elfcpp::R_X86_64_GOTPCREL64: |
2535 | case elfcpp::R_X86_64_GOTPCREL: | |
2536 | case elfcpp::R_X86_64_GOTPLT64: | |
2e30d253 ILT |
2537 | { |
2538 | // The symbol requires a GOT entry. | |
2539 | Output_data_got<64, false>* got = target->got_section(symtab, layout); | |
7bf1f802 | 2540 | if (gsym->final_value_is_known()) |
7223e9ca ILT |
2541 | { |
2542 | // For a STT_GNU_IFUNC symbol we want the PLT address. | |
2543 | if (gsym->type() == elfcpp::STT_GNU_IFUNC) | |
2544 | got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2545 | else | |
2546 | got->add_global(gsym, GOT_TYPE_STANDARD); | |
2547 | } | |
7bf1f802 ILT |
2548 | else |
2549 | { | |
2e30d253 ILT |
2550 | // If this symbol is not fully resolved, we need to add a |
2551 | // dynamic relocation for it. | |
7bf1f802 | 2552 | Reloc_section* rela_dyn = target->rela_dyn_section(layout); |
07aa62f2 ILT |
2553 | |
2554 | // Use a GLOB_DAT rather than a RELATIVE reloc if: | |
2555 | // | |
2556 | // 1) The symbol may be defined in some other module. | |
2557 | // | |
2558 | // 2) We are building a shared library and this is a | |
2559 | // protected symbol; using GLOB_DAT means that the dynamic | |
2560 | // linker can use the address of the PLT in the main | |
2561 | // executable when appropriate so that function address | |
2562 | // comparisons work. | |
2563 | // | |
2564 | // 3) This is a STT_GNU_IFUNC symbol in position dependent | |
2565 | // code, again so that function address comparisons work. | |
7223e9ca ILT |
2566 | if (gsym->is_from_dynobj() |
2567 | || gsym->is_undefined() | |
2568 | || gsym->is_preemptible() | |
07aa62f2 ILT |
2569 | || (gsym->visibility() == elfcpp::STV_PROTECTED |
2570 | && parameters->options().shared()) | |
7223e9ca ILT |
2571 | || (gsym->type() == elfcpp::STT_GNU_IFUNC |
2572 | && parameters->options().output_is_position_independent())) | |
83896202 ILT |
2573 | got->add_global_with_rel(gsym, GOT_TYPE_STANDARD, rela_dyn, |
2574 | elfcpp::R_X86_64_GLOB_DAT); | |
7bf1f802 | 2575 | else |
2e30d253 | 2576 | { |
7223e9ca ILT |
2577 | // For a STT_GNU_IFUNC symbol we want to write the PLT |
2578 | // offset into the GOT, so that function pointer | |
2579 | // comparisons work correctly. | |
2580 | bool is_new; | |
2581 | if (gsym->type() != elfcpp::STT_GNU_IFUNC) | |
2582 | is_new = got->add_global(gsym, GOT_TYPE_STANDARD); | |
2583 | else | |
2584 | { | |
2585 | is_new = got->add_global_plt(gsym, GOT_TYPE_STANDARD); | |
2586 | // Tell the dynamic linker to use the PLT address | |
2587 | // when resolving relocations. | |
2588 | if (gsym->is_from_dynobj() | |
2589 | && !parameters->options().shared()) | |
2590 | gsym->set_needs_dynsym_value(); | |
2591 | } | |
2592 | if (is_new) | |
2593 | { | |
2594 | unsigned int got_off = gsym->got_offset(GOT_TYPE_STANDARD); | |
2595 | rela_dyn->add_global_relative(gsym, | |
2596 | elfcpp::R_X86_64_RELATIVE, | |
2597 | got, got_off, 0); | |
2598 | } | |
2e30d253 ILT |
2599 | } |
2600 | } | |
ee9e9e86 ILT |
2601 | // For GOTPLT64, we also need a PLT entry (but only if the |
2602 | // symbol is not fully resolved). | |
2603 | if (r_type == elfcpp::R_X86_64_GOTPLT64 | |
2604 | && !gsym->final_value_is_known()) | |
2605 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2606 | } |
2607 | break; | |
2608 | ||
2609 | case elfcpp::R_X86_64_PLT32: | |
2610 | // If the symbol is fully resolved, this is just a PC32 reloc. | |
2611 | // Otherwise we need a PLT entry. | |
2612 | if (gsym->final_value_is_known()) | |
2613 | break; | |
96f2030e ILT |
2614 | // If building a shared library, we can also skip the PLT entry |
2615 | // if the symbol is defined in the output file and is protected | |
2616 | // or hidden. | |
2617 | if (gsym->is_defined() | |
2618 | && !gsym->is_from_dynobj() | |
2619 | && !gsym->is_preemptible()) | |
2620 | break; | |
2e30d253 ILT |
2621 | target->make_plt_entry(symtab, layout, gsym); |
2622 | break; | |
2623 | ||
fdc2f80f | 2624 | case elfcpp::R_X86_64_GOTPC32: |
e822f2b1 | 2625 | case elfcpp::R_X86_64_GOTOFF64: |
fdc2f80f ILT |
2626 | case elfcpp::R_X86_64_GOTPC64: |
2627 | case elfcpp::R_X86_64_PLTOFF64: | |
2e30d253 ILT |
2628 | // We need a GOT section. |
2629 | target->got_section(symtab, layout); | |
ee9e9e86 ILT |
2630 | // For PLTOFF64, we also need a PLT entry (but only if the |
2631 | // symbol is not fully resolved). | |
2632 | if (r_type == elfcpp::R_X86_64_PLTOFF64 | |
2633 | && !gsym->final_value_is_known()) | |
2634 | target->make_plt_entry(symtab, layout, gsym); | |
2e30d253 ILT |
2635 | break; |
2636 | ||
2e30d253 ILT |
2637 | case elfcpp::R_X86_64_COPY: |
2638 | case elfcpp::R_X86_64_GLOB_DAT: | |
2639 | case elfcpp::R_X86_64_JUMP_SLOT: | |
2640 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 2641 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 2642 | // These are outstanding tls relocs, which are unexpected when linking |
e822f2b1 | 2643 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 2644 | case elfcpp::R_X86_64_DTPMOD64: |
e822f2b1 | 2645 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
2646 | gold_error(_("%s: unexpected reloc %u in object file"), |
2647 | object->name().c_str(), r_type); | |
2e30d253 | 2648 | break; |
2e30d253 | 2649 | |
d61c17ea | 2650 | // These are initial tls relocs, which are expected for global() |
56622147 ILT |
2651 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
2652 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 2653 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 2654 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
2655 | case elfcpp::R_X86_64_DTPOFF32: |
2656 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
2657 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
2658 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
2e30d253 ILT |
2659 | { |
2660 | const bool is_final = gsym->final_value_is_known(); | |
e041f13d | 2661 | const tls::Tls_optimization optimized_type |
fc51264f | 2662 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
2663 | switch (r_type) |
2664 | { | |
56622147 | 2665 | case elfcpp::R_X86_64_TLSGD: // General-dynamic |
7bf1f802 ILT |
2666 | if (optimized_type == tls::TLSOPT_NONE) |
2667 | { | |
2668 | // Create a pair of GOT entries for the module index and | |
2669 | // dtv-relative offset. | |
2670 | Output_data_got<64, false>* got | |
2671 | = target->got_section(symtab, layout); | |
83896202 ILT |
2672 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_PAIR, |
2673 | target->rela_dyn_section(layout), | |
2674 | elfcpp::R_X86_64_DTPMOD64, | |
2675 | elfcpp::R_X86_64_DTPOFF64); | |
7bf1f802 ILT |
2676 | } |
2677 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2678 | { | |
2679 | // Create a GOT entry for the tp-relative offset. | |
2680 | Output_data_got<64, false>* got | |
2681 | = target->got_section(symtab, layout); | |
83896202 ILT |
2682 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
2683 | target->rela_dyn_section(layout), | |
2684 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
2685 | } |
2686 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2687 | unsupported_reloc_global(object, r_type, gsym); | |
2688 | break; | |
2689 | ||
56622147 | 2690 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: |
edfbb029 | 2691 | target->define_tls_base_symbol(symtab, layout); |
c2b45e22 CC |
2692 | if (optimized_type == tls::TLSOPT_NONE) |
2693 | { | |
2694 | // Create reserved PLT and GOT entries for the resolver. | |
2695 | target->reserve_tlsdesc_entries(symtab, layout); | |
2696 | ||
a8df5856 ILT |
2697 | // Create a double GOT entry with an R_X86_64_TLSDESC |
2698 | // reloc. The R_X86_64_TLSDESC reloc is resolved | |
2699 | // lazily, so the GOT entry needs to be in an area in | |
2700 | // .got.plt, not .got. Call got_section to make sure | |
2701 | // the section has been created. | |
2702 | target->got_section(symtab, layout); | |
2703 | Output_data_got<64, false>* got = target->got_tlsdesc_section(); | |
ca09d69a | 2704 | Reloc_section* rt = target->rela_tlsdesc_section(layout); |
83896202 ILT |
2705 | got->add_global_pair_with_rel(gsym, GOT_TYPE_TLS_DESC, rt, |
2706 | elfcpp::R_X86_64_TLSDESC, 0); | |
c2b45e22 CC |
2707 | } |
2708 | else if (optimized_type == tls::TLSOPT_TO_IE) | |
2709 | { | |
2710 | // Create a GOT entry for the tp-relative offset. | |
2711 | Output_data_got<64, false>* got | |
2712 | = target->got_section(symtab, layout); | |
83896202 ILT |
2713 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
2714 | target->rela_dyn_section(layout), | |
2715 | elfcpp::R_X86_64_TPOFF64); | |
c2b45e22 CC |
2716 | } |
2717 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 | 2718 | unsupported_reloc_global(object, r_type, gsym); |
2e30d253 ILT |
2719 | break; |
2720 | ||
c2b45e22 CC |
2721 | case elfcpp::R_X86_64_TLSDESC_CALL: |
2722 | break; | |
2723 | ||
e041f13d | 2724 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
7bf1f802 ILT |
2725 | if (optimized_type == tls::TLSOPT_NONE) |
2726 | { | |
2727 | // Create a GOT entry for the module index. | |
31d60480 | 2728 | target->got_mod_index_entry(symtab, layout, object); |
7bf1f802 ILT |
2729 | } |
2730 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
2731 | unsupported_reloc_global(object, r_type, gsym); | |
2732 | break; | |
2733 | ||
0ffd9845 ILT |
2734 | case elfcpp::R_X86_64_DTPOFF32: |
2735 | case elfcpp::R_X86_64_DTPOFF64: | |
e041f13d ILT |
2736 | break; |
2737 | ||
56622147 | 2738 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
535890bb | 2739 | layout->set_has_static_tls(); |
7bf1f802 ILT |
2740 | if (optimized_type == tls::TLSOPT_NONE) |
2741 | { | |
2742 | // Create a GOT entry for the tp-relative offset. | |
2743 | Output_data_got<64, false>* got | |
2744 | = target->got_section(symtab, layout); | |
83896202 ILT |
2745 | got->add_global_with_rel(gsym, GOT_TYPE_TLS_OFFSET, |
2746 | target->rela_dyn_section(layout), | |
2747 | elfcpp::R_X86_64_TPOFF64); | |
7bf1f802 ILT |
2748 | } |
2749 | else if (optimized_type != tls::TLSOPT_TO_LE) | |
56622147 ILT |
2750 | unsupported_reloc_global(object, r_type, gsym); |
2751 | break; | |
0ffd9845 | 2752 | |
56622147 | 2753 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
535890bb | 2754 | layout->set_has_static_tls(); |
8851ecca | 2755 | if (parameters->options().shared()) |
7bf1f802 | 2756 | unsupported_reloc_local(object, r_type); |
2e30d253 | 2757 | break; |
e041f13d ILT |
2758 | |
2759 | default: | |
2760 | gold_unreachable(); | |
2e30d253 ILT |
2761 | } |
2762 | } | |
2763 | break; | |
fdc2f80f ILT |
2764 | |
2765 | case elfcpp::R_X86_64_SIZE32: | |
2766 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 2767 | default: |
75f2446e | 2768 | gold_error(_("%s: unsupported reloc %u against global symbol %s"), |
a2b1aa12 ILT |
2769 | object->name().c_str(), r_type, |
2770 | gsym->demangled_name().c_str()); | |
2e30d253 ILT |
2771 | break; |
2772 | } | |
2773 | } | |
2774 | ||
fc51264f | 2775 | template<int size> |
6d03d481 | 2776 | void |
fc51264f L |
2777 | Target_x86_64<size>::gc_process_relocs(Symbol_table* symtab, |
2778 | Layout* layout, | |
2779 | Sized_relobj_file<size, false>* object, | |
2780 | unsigned int data_shndx, | |
2781 | unsigned int sh_type, | |
2782 | const unsigned char* prelocs, | |
2783 | size_t reloc_count, | |
2784 | Output_section* output_section, | |
2785 | bool needs_special_offset_handling, | |
2786 | size_t local_symbol_count, | |
2787 | const unsigned char* plocal_symbols) | |
6d03d481 ST |
2788 | { |
2789 | ||
2790 | if (sh_type == elfcpp::SHT_REL) | |
2791 | { | |
2792 | return; | |
2793 | } | |
2794 | ||
fc51264f L |
2795 | gold::gc_process_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
2796 | Target_x86_64<size>::Scan, | |
2797 | Target_x86_64<size>::Relocatable_size_for_reloc>( | |
6d03d481 ST |
2798 | symtab, |
2799 | layout, | |
2800 | this, | |
2801 | object, | |
2802 | data_shndx, | |
2803 | prelocs, | |
2804 | reloc_count, | |
2805 | output_section, | |
2806 | needs_special_offset_handling, | |
2807 | local_symbol_count, | |
2808 | plocal_symbols); | |
2809 | ||
2810 | } | |
2e30d253 ILT |
2811 | // Scan relocations for a section. |
2812 | ||
fc51264f | 2813 | template<int size> |
2e30d253 | 2814 | void |
fc51264f L |
2815 | Target_x86_64<size>::scan_relocs(Symbol_table* symtab, |
2816 | Layout* layout, | |
2817 | Sized_relobj_file<size, false>* object, | |
2818 | unsigned int data_shndx, | |
2819 | unsigned int sh_type, | |
2820 | const unsigned char* prelocs, | |
2821 | size_t reloc_count, | |
2822 | Output_section* output_section, | |
2823 | bool needs_special_offset_handling, | |
2824 | size_t local_symbol_count, | |
2825 | const unsigned char* plocal_symbols) | |
2e30d253 ILT |
2826 | { |
2827 | if (sh_type == elfcpp::SHT_REL) | |
2828 | { | |
75f2446e ILT |
2829 | gold_error(_("%s: unsupported REL reloc section"), |
2830 | object->name().c_str()); | |
2831 | return; | |
2e30d253 ILT |
2832 | } |
2833 | ||
fc51264f L |
2834 | gold::scan_relocs<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
2835 | Target_x86_64<size>::Scan>( | |
2e30d253 ILT |
2836 | symtab, |
2837 | layout, | |
2838 | this, | |
2839 | object, | |
2840 | data_shndx, | |
2841 | prelocs, | |
2842 | reloc_count, | |
730cdc88 ILT |
2843 | output_section, |
2844 | needs_special_offset_handling, | |
2e30d253 | 2845 | local_symbol_count, |
730cdc88 | 2846 | plocal_symbols); |
2e30d253 ILT |
2847 | } |
2848 | ||
2849 | // Finalize the sections. | |
2850 | ||
fc51264f | 2851 | template<int size> |
2e30d253 | 2852 | void |
fc51264f | 2853 | Target_x86_64<size>::do_finalize_sections( |
f59f41f3 DK |
2854 | Layout* layout, |
2855 | const Input_objects*, | |
e785ec03 | 2856 | Symbol_table* symtab) |
2e30d253 | 2857 | { |
ea715a34 ILT |
2858 | const Reloc_section* rel_plt = (this->plt_ == NULL |
2859 | ? NULL | |
e291e7b9 | 2860 | : this->plt_->rela_plt()); |
ea715a34 | 2861 | layout->add_target_dynamic_tags(false, this->got_plt_, rel_plt, |
612a8d3d | 2862 | this->rela_dyn_, true, false); |
ea715a34 | 2863 | |
2e30d253 ILT |
2864 | // Fill in some more dynamic tags. |
2865 | Output_data_dynamic* const odyn = layout->dynamic_data(); | |
2866 | if (odyn != NULL) | |
2867 | { | |
22b127cc | 2868 | if (this->plt_ != NULL |
ea715a34 ILT |
2869 | && this->plt_->output_section() != NULL |
2870 | && this->plt_->has_tlsdesc_entry()) | |
2e30d253 | 2871 | { |
ea715a34 ILT |
2872 | unsigned int plt_offset = this->plt_->get_tlsdesc_plt_offset(); |
2873 | unsigned int got_offset = this->plt_->get_tlsdesc_got_offset(); | |
2874 | this->got_->finalize_data_size(); | |
2875 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_PLT, | |
2876 | this->plt_, plt_offset); | |
2877 | odyn->add_section_plus_offset(elfcpp::DT_TLSDESC_GOT, | |
2878 | this->got_, got_offset); | |
2e30d253 ILT |
2879 | } |
2880 | } | |
2881 | ||
2882 | // Emit any relocs we saved in an attempt to avoid generating COPY | |
2883 | // relocs. | |
12c0daef ILT |
2884 | if (this->copy_relocs_.any_saved_relocs()) |
2885 | this->copy_relocs_.emit(this->rela_dyn_section(layout)); | |
e785ec03 ILT |
2886 | |
2887 | // Set the size of the _GLOBAL_OFFSET_TABLE_ symbol to the size of | |
2888 | // the .got.plt section. | |
2889 | Symbol* sym = this->global_offset_table_; | |
2890 | if (sym != NULL) | |
2891 | { | |
2892 | uint64_t data_size = this->got_plt_->current_data_size(); | |
fc51264f | 2893 | symtab->get_sized_symbol<size>(sym)->set_symsize(data_size); |
e785ec03 | 2894 | } |
28a13fec | 2895 | |
67181c72 ILT |
2896 | if (parameters->doing_static_link() |
2897 | && (this->plt_ == NULL || !this->plt_->has_irelative_section())) | |
28a13fec ILT |
2898 | { |
2899 | // If linking statically, make sure that the __rela_iplt symbols | |
2900 | // were defined if necessary, even if we didn't create a PLT. | |
2901 | static const Define_symbol_in_segment syms[] = | |
2902 | { | |
2903 | { | |
2904 | "__rela_iplt_start", // name | |
2905 | elfcpp::PT_LOAD, // segment_type | |
2906 | elfcpp::PF_W, // segment_flags_set | |
2907 | elfcpp::PF(0), // segment_flags_clear | |
2908 | 0, // value | |
2909 | 0, // size | |
2910 | elfcpp::STT_NOTYPE, // type | |
2911 | elfcpp::STB_GLOBAL, // binding | |
2912 | elfcpp::STV_HIDDEN, // visibility | |
2913 | 0, // nonvis | |
2914 | Symbol::SEGMENT_START, // offset_from_base | |
2915 | true // only_if_ref | |
2916 | }, | |
2917 | { | |
2918 | "__rela_iplt_end", // name | |
2919 | elfcpp::PT_LOAD, // segment_type | |
2920 | elfcpp::PF_W, // segment_flags_set | |
2921 | elfcpp::PF(0), // segment_flags_clear | |
2922 | 0, // value | |
2923 | 0, // size | |
2924 | elfcpp::STT_NOTYPE, // type | |
2925 | elfcpp::STB_GLOBAL, // binding | |
2926 | elfcpp::STV_HIDDEN, // visibility | |
2927 | 0, // nonvis | |
2928 | Symbol::SEGMENT_START, // offset_from_base | |
2929 | true // only_if_ref | |
2930 | } | |
2931 | }; | |
2932 | ||
2933 | symtab->define_symbols(layout, 2, syms, | |
2934 | layout->script_options()->saw_sections_clause()); | |
2935 | } | |
2e30d253 ILT |
2936 | } |
2937 | ||
2938 | // Perform a relocation. | |
2939 | ||
fc51264f | 2940 | template<int size> |
2e30d253 | 2941 | inline bool |
fc51264f L |
2942 | Target_x86_64<size>::Relocate::relocate( |
2943 | const Relocate_info<size, false>* relinfo, | |
2944 | Target_x86_64<size>* target, | |
2945 | Output_section*, | |
2946 | size_t relnum, | |
2947 | const elfcpp::Rela<size, false>& rela, | |
2948 | unsigned int r_type, | |
2949 | const Sized_symbol<size>* gsym, | |
2950 | const Symbol_value<size>* psymval, | |
2951 | unsigned char* view, | |
2952 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
2953 | section_size_type view_size) | |
2e30d253 ILT |
2954 | { |
2955 | if (this->skip_call_tls_get_addr_) | |
2956 | { | |
5efc7cd2 CC |
2957 | if ((r_type != elfcpp::R_X86_64_PLT32 |
2958 | && r_type != elfcpp::R_X86_64_PC32) | |
2e30d253 | 2959 | || gsym == NULL |
0ffd9845 | 2960 | || strcmp(gsym->name(), "__tls_get_addr") != 0) |
2e30d253 | 2961 | { |
75f2446e ILT |
2962 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
2963 | _("missing expected TLS relocation")); | |
2964 | } | |
2965 | else | |
2966 | { | |
2967 | this->skip_call_tls_get_addr_ = false; | |
2968 | return false; | |
2e30d253 | 2969 | } |
2e30d253 ILT |
2970 | } |
2971 | ||
fc51264f | 2972 | const Sized_relobj_file<size, false>* object = relinfo->object; |
7223e9ca ILT |
2973 | |
2974 | // Pick the value to use for symbols defined in the PLT. | |
fc51264f | 2975 | Symbol_value<size> symval; |
96f2030e | 2976 | if (gsym != NULL |
95a2c8d6 | 2977 | && gsym->use_plt_offset(Scan::get_reference_flags(r_type))) |
2e30d253 | 2978 | { |
67181c72 | 2979 | symval.set_output_value(target->plt_address_for_global(gsym) |
2e30d253 ILT |
2980 | + gsym->plt_offset()); |
2981 | psymval = &symval; | |
2982 | } | |
7223e9ca ILT |
2983 | else if (gsym == NULL && psymval->is_ifunc_symbol()) |
2984 | { | |
fc51264f | 2985 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
7223e9ca ILT |
2986 | if (object->local_has_plt_offset(r_sym)) |
2987 | { | |
67181c72 | 2988 | symval.set_output_value(target->plt_address_for_local(object, r_sym) |
7223e9ca ILT |
2989 | + object->local_plt_offset(r_sym)); |
2990 | psymval = &symval; | |
2991 | } | |
2992 | } | |
2e30d253 | 2993 | |
0ffd9845 ILT |
2994 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
2995 | ||
2996 | // Get the GOT offset if needed. | |
96f2030e ILT |
2997 | // The GOT pointer points to the end of the GOT section. |
2998 | // We need to subtract the size of the GOT section to get | |
2999 | // the actual offset to use in the relocation. | |
0ffd9845 ILT |
3000 | bool have_got_offset = false; |
3001 | unsigned int got_offset = 0; | |
3002 | switch (r_type) | |
3003 | { | |
3004 | case elfcpp::R_X86_64_GOT32: | |
3005 | case elfcpp::R_X86_64_GOT64: | |
3006 | case elfcpp::R_X86_64_GOTPLT64: | |
3007 | case elfcpp::R_X86_64_GOTPCREL: | |
3008 | case elfcpp::R_X86_64_GOTPCREL64: | |
3009 | if (gsym != NULL) | |
3010 | { | |
0a65a3a7 CC |
3011 | gold_assert(gsym->has_got_offset(GOT_TYPE_STANDARD)); |
3012 | got_offset = gsym->got_offset(GOT_TYPE_STANDARD) - target->got_size(); | |
0ffd9845 ILT |
3013 | } |
3014 | else | |
3015 | { | |
fc51264f | 3016 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
0a65a3a7 CC |
3017 | gold_assert(object->local_has_got_offset(r_sym, GOT_TYPE_STANDARD)); |
3018 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_STANDARD) | |
3019 | - target->got_size()); | |
0ffd9845 ILT |
3020 | } |
3021 | have_got_offset = true; | |
3022 | break; | |
3023 | ||
3024 | default: | |
3025 | break; | |
3026 | } | |
2e30d253 ILT |
3027 | |
3028 | switch (r_type) | |
3029 | { | |
3030 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3031 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3032 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
2e30d253 ILT |
3033 | break; |
3034 | ||
3035 | case elfcpp::R_X86_64_64: | |
fc51264f | 3036 | Relocate_functions<size, false>::rela64(view, object, psymval, addend); |
2e30d253 ILT |
3037 | break; |
3038 | ||
3039 | case elfcpp::R_X86_64_PC64: | |
fc51264f | 3040 | Relocate_functions<size, false>::pcrela64(view, object, psymval, addend, |
2e30d253 ILT |
3041 | address); |
3042 | break; | |
3043 | ||
3044 | case elfcpp::R_X86_64_32: | |
7bb3655e ILT |
3045 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3046 | // uint64_t x = value + addend; | |
3047 | // x == static_cast<uint64_t>(static_cast<uint32_t>(x)) | |
3048 | // Likewise for other <=32-bit relocations (but see R_X86_64_32S). | |
fc51264f | 3049 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3050 | break; |
3051 | ||
3052 | case elfcpp::R_X86_64_32S: | |
7bb3655e ILT |
3053 | // FIXME: we need to verify that value + addend fits into 32 bits: |
3054 | // int64_t x = value + addend; // note this quantity is signed! | |
3055 | // x == static_cast<int64_t>(static_cast<int32_t>(x)) | |
fc51264f | 3056 | Relocate_functions<size, false>::rela32(view, object, psymval, addend); |
2e30d253 ILT |
3057 | break; |
3058 | ||
3059 | case elfcpp::R_X86_64_PC32: | |
fc51264f L |
3060 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3061 | address); | |
2e30d253 ILT |
3062 | break; |
3063 | ||
3064 | case elfcpp::R_X86_64_16: | |
fc51264f | 3065 | Relocate_functions<size, false>::rela16(view, object, psymval, addend); |
2e30d253 ILT |
3066 | break; |
3067 | ||
3068 | case elfcpp::R_X86_64_PC16: | |
fc51264f L |
3069 | Relocate_functions<size, false>::pcrela16(view, object, psymval, addend, |
3070 | address); | |
2e30d253 ILT |
3071 | break; |
3072 | ||
3073 | case elfcpp::R_X86_64_8: | |
fc51264f | 3074 | Relocate_functions<size, false>::rela8(view, object, psymval, addend); |
2e30d253 ILT |
3075 | break; |
3076 | ||
3077 | case elfcpp::R_X86_64_PC8: | |
fc51264f L |
3078 | Relocate_functions<size, false>::pcrela8(view, object, psymval, addend, |
3079 | address); | |
2e30d253 ILT |
3080 | break; |
3081 | ||
3082 | case elfcpp::R_X86_64_PLT32: | |
f389a824 ILT |
3083 | gold_assert(gsym == NULL |
3084 | || gsym->has_plt_offset() | |
99f8faca ILT |
3085 | || gsym->final_value_is_known() |
3086 | || (gsym->is_defined() | |
3087 | && !gsym->is_from_dynobj() | |
3088 | && !gsym->is_preemptible())); | |
ee9e9e86 ILT |
3089 | // Note: while this code looks the same as for R_X86_64_PC32, it |
3090 | // behaves differently because psymval was set to point to | |
3091 | // the PLT entry, rather than the symbol, in Scan::global(). | |
fc51264f L |
3092 | Relocate_functions<size, false>::pcrela32(view, object, psymval, addend, |
3093 | address); | |
2e30d253 ILT |
3094 | break; |
3095 | ||
ee9e9e86 ILT |
3096 | case elfcpp::R_X86_64_PLTOFF64: |
3097 | { | |
3098 | gold_assert(gsym); | |
3099 | gold_assert(gsym->has_plt_offset() | |
3100 | || gsym->final_value_is_known()); | |
fc51264f | 3101 | typename elfcpp::Elf_types<size>::Elf_Addr got_address; |
ee9e9e86 | 3102 | got_address = target->got_section(NULL, NULL)->address(); |
fc51264f L |
3103 | Relocate_functions<size, false>::rela64(view, object, psymval, |
3104 | addend - got_address); | |
ee9e9e86 ILT |
3105 | } |
3106 | ||
2e30d253 | 3107 | case elfcpp::R_X86_64_GOT32: |
0ffd9845 | 3108 | gold_assert(have_got_offset); |
fc51264f | 3109 | Relocate_functions<size, false>::rela32(view, got_offset, addend); |
2e30d253 ILT |
3110 | break; |
3111 | ||
e822f2b1 ILT |
3112 | case elfcpp::R_X86_64_GOTPC32: |
3113 | { | |
3114 | gold_assert(gsym); | |
fc51264f | 3115 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3116 | value = target->got_plt_section()->address(); |
fc51264f | 3117 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
e822f2b1 ILT |
3118 | } |
3119 | break; | |
3120 | ||
3121 | case elfcpp::R_X86_64_GOT64: | |
3122 | // The ABI doc says "Like GOT64, but indicates a PLT entry is needed." | |
3123 | // Since we always add a PLT entry, this is equivalent. | |
fdc2f80f | 3124 | case elfcpp::R_X86_64_GOTPLT64: |
0ffd9845 | 3125 | gold_assert(have_got_offset); |
fc51264f | 3126 | Relocate_functions<size, false>::rela64(view, got_offset, addend); |
e822f2b1 ILT |
3127 | break; |
3128 | ||
3129 | case elfcpp::R_X86_64_GOTPC64: | |
3130 | { | |
3131 | gold_assert(gsym); | |
fc51264f | 3132 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3133 | value = target->got_plt_section()->address(); |
fc51264f | 3134 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
3135 | } |
3136 | break; | |
3137 | ||
2e30d253 ILT |
3138 | case elfcpp::R_X86_64_GOTOFF64: |
3139 | { | |
fc51264f | 3140 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
2e30d253 | 3141 | value = (psymval->value(object, 0) |
96f2030e | 3142 | - target->got_plt_section()->address()); |
fc51264f | 3143 | Relocate_functions<size, false>::rela64(view, value, addend); |
2e30d253 ILT |
3144 | } |
3145 | break; | |
3146 | ||
3147 | case elfcpp::R_X86_64_GOTPCREL: | |
3148 | { | |
0ffd9845 | 3149 | gold_assert(have_got_offset); |
fc51264f | 3150 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3151 | value = target->got_plt_section()->address() + got_offset; |
fc51264f | 3152 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
2e30d253 ILT |
3153 | } |
3154 | break; | |
3155 | ||
e822f2b1 ILT |
3156 | case elfcpp::R_X86_64_GOTPCREL64: |
3157 | { | |
0ffd9845 | 3158 | gold_assert(have_got_offset); |
fc51264f | 3159 | typename elfcpp::Elf_types<size>::Elf_Addr value; |
96f2030e | 3160 | value = target->got_plt_section()->address() + got_offset; |
fc51264f | 3161 | Relocate_functions<size, false>::pcrela64(view, value, addend, address); |
e822f2b1 ILT |
3162 | } |
3163 | break; | |
3164 | ||
2e30d253 ILT |
3165 | case elfcpp::R_X86_64_COPY: |
3166 | case elfcpp::R_X86_64_GLOB_DAT: | |
3167 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3168 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3169 | case elfcpp::R_X86_64_IRELATIVE: |
d61c17ea | 3170 | // These are outstanding tls relocs, which are unexpected when linking |
2e30d253 | 3171 | case elfcpp::R_X86_64_TPOFF64: |
2e30d253 | 3172 | case elfcpp::R_X86_64_DTPMOD64: |
2e30d253 | 3173 | case elfcpp::R_X86_64_TLSDESC: |
75f2446e ILT |
3174 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3175 | _("unexpected reloc %u in object file"), | |
3176 | r_type); | |
2e30d253 ILT |
3177 | break; |
3178 | ||
d61c17ea | 3179 | // These are initial tls relocs, which are expected when linking |
56622147 ILT |
3180 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3181 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
e041f13d | 3182 | case elfcpp::R_X86_64_TLSDESC_CALL: |
56622147 | 3183 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
0ffd9845 ILT |
3184 | case elfcpp::R_X86_64_DTPOFF32: |
3185 | case elfcpp::R_X86_64_DTPOFF64: | |
56622147 ILT |
3186 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3187 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
7bf1f802 ILT |
3188 | this->relocate_tls(relinfo, target, relnum, rela, r_type, gsym, psymval, |
3189 | view, address, view_size); | |
2e30d253 | 3190 | break; |
2e30d253 | 3191 | |
fdc2f80f ILT |
3192 | case elfcpp::R_X86_64_SIZE32: |
3193 | case elfcpp::R_X86_64_SIZE64: | |
2e30d253 | 3194 | default: |
75f2446e ILT |
3195 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3196 | _("unsupported reloc %u"), | |
3197 | r_type); | |
2e30d253 ILT |
3198 | break; |
3199 | } | |
3200 | ||
3201 | return true; | |
3202 | } | |
3203 | ||
3204 | // Perform a TLS relocation. | |
3205 | ||
fc51264f | 3206 | template<int size> |
2e30d253 | 3207 | inline void |
fc51264f L |
3208 | Target_x86_64<size>::Relocate::relocate_tls( |
3209 | const Relocate_info<size, false>* relinfo, | |
3210 | Target_x86_64<size>* target, | |
3211 | size_t relnum, | |
3212 | const elfcpp::Rela<size, false>& rela, | |
3213 | unsigned int r_type, | |
3214 | const Sized_symbol<size>* gsym, | |
3215 | const Symbol_value<size>* psymval, | |
3216 | unsigned char* view, | |
3217 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3218 | section_size_type view_size) | |
2e30d253 | 3219 | { |
2e30d253 | 3220 | Output_segment* tls_segment = relinfo->layout->tls_segment(); |
7bf1f802 | 3221 | |
fc51264f | 3222 | const Sized_relobj_file<size, false>* object = relinfo->object; |
6a41d30b | 3223 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f | 3224 | elfcpp::Shdr<size, false> data_shdr(relinfo->data_shdr); |
36171d64 | 3225 | bool is_executable = (data_shdr.get_sh_flags() & elfcpp::SHF_EXECINSTR) != 0; |
2e30d253 | 3226 | |
fc51264f | 3227 | typename elfcpp::Elf_types<size>::Elf_Addr value = psymval->value(relinfo->object, 0); |
2e30d253 ILT |
3228 | |
3229 | const bool is_final = (gsym == NULL | |
b3705d2a | 3230 | ? !parameters->options().shared() |
2e30d253 | 3231 | : gsym->final_value_is_known()); |
36171d64 | 3232 | tls::Tls_optimization optimized_type |
fc51264f | 3233 | = Target_x86_64<size>::optimize_tls_reloc(is_final, r_type); |
2e30d253 ILT |
3234 | switch (r_type) |
3235 | { | |
56622147 | 3236 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
36171d64 CC |
3237 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3238 | { | |
3239 | // If this code sequence is used in a non-executable section, | |
3240 | // we will not optimize the R_X86_64_DTPOFF32/64 relocation, | |
3241 | // on the assumption that it's being used by itself in a debug | |
3242 | // section. Therefore, in the unlikely event that the code | |
3243 | // sequence appears in a non-executable section, we simply | |
3244 | // leave it unoptimized. | |
3245 | optimized_type = tls::TLSOPT_NONE; | |
3246 | } | |
e041f13d | 3247 | if (optimized_type == tls::TLSOPT_TO_LE) |
2e30d253 | 3248 | { |
62855347 ILT |
3249 | if (tls_segment == NULL) |
3250 | { | |
191f1a2d ILT |
3251 | gold_assert(parameters->errors()->error_count() > 0 |
3252 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3253 | return; |
3254 | } | |
2e30d253 | 3255 | this->tls_gd_to_le(relinfo, relnum, tls_segment, |
72ec2876 | 3256 | rela, r_type, value, view, |
2e30d253 ILT |
3257 | view_size); |
3258 | break; | |
3259 | } | |
7bf1f802 ILT |
3260 | else |
3261 | { | |
c2b45e22 CC |
3262 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE |
3263 | ? GOT_TYPE_TLS_OFFSET | |
3264 | : GOT_TYPE_TLS_PAIR); | |
7bf1f802 ILT |
3265 | unsigned int got_offset; |
3266 | if (gsym != NULL) | |
3267 | { | |
c2b45e22 CC |
3268 | gold_assert(gsym->has_got_offset(got_type)); |
3269 | got_offset = gsym->got_offset(got_type) - target->got_size(); | |
7bf1f802 ILT |
3270 | } |
3271 | else | |
3272 | { | |
fc51264f | 3273 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
c2b45e22 CC |
3274 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
3275 | got_offset = (object->local_got_offset(r_sym, got_type) | |
7bf1f802 ILT |
3276 | - target->got_size()); |
3277 | } | |
3278 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3279 | { | |
c2b45e22 | 3280 | value = target->got_plt_section()->address() + got_offset; |
7bf1f802 | 3281 | this->tls_gd_to_ie(relinfo, relnum, tls_segment, rela, r_type, |
c2b45e22 | 3282 | value, view, address, view_size); |
7bf1f802 ILT |
3283 | break; |
3284 | } | |
3285 | else if (optimized_type == tls::TLSOPT_NONE) | |
3286 | { | |
3287 | // Relocate the field with the offset of the pair of GOT | |
3288 | // entries. | |
6a41d30b | 3289 | value = target->got_plt_section()->address() + got_offset; |
fc51264f L |
3290 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
3291 | address); | |
7bf1f802 ILT |
3292 | break; |
3293 | } | |
3294 | } | |
72ec2876 | 3295 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3296 | _("unsupported reloc %u"), r_type); |
2e30d253 ILT |
3297 | break; |
3298 | ||
c2b45e22 CC |
3299 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) |
3300 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
36171d64 CC |
3301 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3302 | { | |
3303 | // See above comment for R_X86_64_TLSGD. | |
3304 | optimized_type = tls::TLSOPT_NONE; | |
3305 | } | |
c2b45e22 CC |
3306 | if (optimized_type == tls::TLSOPT_TO_LE) |
3307 | { | |
62855347 ILT |
3308 | if (tls_segment == NULL) |
3309 | { | |
191f1a2d ILT |
3310 | gold_assert(parameters->errors()->error_count() > 0 |
3311 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3312 | return; |
3313 | } | |
c2b45e22 CC |
3314 | this->tls_desc_gd_to_le(relinfo, relnum, tls_segment, |
3315 | rela, r_type, value, view, | |
3316 | view_size); | |
3317 | break; | |
3318 | } | |
3319 | else | |
3320 | { | |
3321 | unsigned int got_type = (optimized_type == tls::TLSOPT_TO_IE | |
3322 | ? GOT_TYPE_TLS_OFFSET | |
3323 | : GOT_TYPE_TLS_DESC); | |
a8df5856 ILT |
3324 | unsigned int got_offset = 0; |
3325 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC | |
3326 | && optimized_type == tls::TLSOPT_NONE) | |
3327 | { | |
3328 | // We created GOT entries in the .got.tlsdesc portion of | |
3329 | // the .got.plt section, but the offset stored in the | |
3330 | // symbol is the offset within .got.tlsdesc. | |
3331 | got_offset = (target->got_size() | |
3332 | + target->got_plt_section()->data_size()); | |
3333 | } | |
c2b45e22 CC |
3334 | if (gsym != NULL) |
3335 | { | |
3336 | gold_assert(gsym->has_got_offset(got_type)); | |
a8df5856 | 3337 | got_offset += gsym->got_offset(got_type) - target->got_size(); |
c2b45e22 CC |
3338 | } |
3339 | else | |
3340 | { | |
fc51264f | 3341 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
c2b45e22 | 3342 | gold_assert(object->local_has_got_offset(r_sym, got_type)); |
a8df5856 ILT |
3343 | got_offset += (object->local_got_offset(r_sym, got_type) |
3344 | - target->got_size()); | |
c2b45e22 CC |
3345 | } |
3346 | if (optimized_type == tls::TLSOPT_TO_IE) | |
3347 | { | |
62855347 ILT |
3348 | if (tls_segment == NULL) |
3349 | { | |
191f1a2d ILT |
3350 | gold_assert(parameters->errors()->error_count() > 0 |
3351 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3352 | return; |
3353 | } | |
c2b45e22 CC |
3354 | value = target->got_plt_section()->address() + got_offset; |
3355 | this->tls_desc_gd_to_ie(relinfo, relnum, tls_segment, | |
3356 | rela, r_type, value, view, address, | |
3357 | view_size); | |
3358 | break; | |
3359 | } | |
3360 | else if (optimized_type == tls::TLSOPT_NONE) | |
3361 | { | |
3362 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3363 | { | |
3364 | // Relocate the field with the offset of the pair of GOT | |
3365 | // entries. | |
3366 | value = target->got_plt_section()->address() + got_offset; | |
fc51264f L |
3367 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
3368 | address); | |
c2b45e22 CC |
3369 | } |
3370 | break; | |
3371 | } | |
3372 | } | |
3373 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), | |
3374 | _("unsupported reloc %u"), r_type); | |
3375 | break; | |
3376 | ||
56622147 | 3377 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic |
36171d64 CC |
3378 | if (!is_executable && optimized_type == tls::TLSOPT_TO_LE) |
3379 | { | |
3380 | // See above comment for R_X86_64_TLSGD. | |
3381 | optimized_type = tls::TLSOPT_NONE; | |
3382 | } | |
e041f13d ILT |
3383 | if (optimized_type == tls::TLSOPT_TO_LE) |
3384 | { | |
62855347 ILT |
3385 | if (tls_segment == NULL) |
3386 | { | |
191f1a2d ILT |
3387 | gold_assert(parameters->errors()->error_count() > 0 |
3388 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3389 | return; |
3390 | } | |
72ec2876 ILT |
3391 | this->tls_ld_to_le(relinfo, relnum, tls_segment, rela, r_type, |
3392 | value, view, view_size); | |
3393 | break; | |
e041f13d | 3394 | } |
7bf1f802 ILT |
3395 | else if (optimized_type == tls::TLSOPT_NONE) |
3396 | { | |
3397 | // Relocate the field with the offset of the GOT entry for | |
3398 | // the module index. | |
3399 | unsigned int got_offset; | |
31d60480 ILT |
3400 | got_offset = (target->got_mod_index_entry(NULL, NULL, NULL) |
3401 | - target->got_size()); | |
6a41d30b | 3402 | value = target->got_plt_section()->address() + got_offset; |
fc51264f L |
3403 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
3404 | address); | |
7bf1f802 ILT |
3405 | break; |
3406 | } | |
72ec2876 | 3407 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
75f2446e | 3408 | _("unsupported reloc %u"), r_type); |
2e30d253 | 3409 | break; |
0ffd9845 ILT |
3410 | |
3411 | case elfcpp::R_X86_64_DTPOFF32: | |
36171d64 CC |
3412 | // This relocation type is used in debugging information. |
3413 | // In that case we need to not optimize the value. If the | |
3414 | // section is not executable, then we assume we should not | |
3415 | // optimize this reloc. See comments above for R_X86_64_TLSGD, | |
3416 | // R_X86_64_GOTPC32_TLSDESC, R_X86_64_TLSDESC_CALL, and | |
3417 | // R_X86_64_TLSLD. | |
3418 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3419 | { | |
62855347 ILT |
3420 | if (tls_segment == NULL) |
3421 | { | |
191f1a2d ILT |
3422 | gold_assert(parameters->errors()->error_count() > 0 |
3423 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3424 | return; |
3425 | } | |
36171d64 CC |
3426 | value -= tls_segment->memsz(); |
3427 | } | |
fc51264f | 3428 | Relocate_functions<size, false>::rela32(view, value, addend); |
0ffd9845 ILT |
3429 | break; |
3430 | ||
3431 | case elfcpp::R_X86_64_DTPOFF64: | |
36171d64 CC |
3432 | // See R_X86_64_DTPOFF32, just above, for why we check for is_executable. |
3433 | if (optimized_type == tls::TLSOPT_TO_LE && is_executable) | |
3434 | { | |
62855347 ILT |
3435 | if (tls_segment == NULL) |
3436 | { | |
191f1a2d ILT |
3437 | gold_assert(parameters->errors()->error_count() > 0 |
3438 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3439 | return; |
3440 | } | |
36171d64 CC |
3441 | value -= tls_segment->memsz(); |
3442 | } | |
fc51264f | 3443 | Relocate_functions<size, false>::rela64(view, value, addend); |
0ffd9845 | 3444 | break; |
2e30d253 | 3445 | |
56622147 ILT |
3446 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec |
3447 | if (optimized_type == tls::TLSOPT_TO_LE) | |
3448 | { | |
62855347 ILT |
3449 | if (tls_segment == NULL) |
3450 | { | |
191f1a2d ILT |
3451 | gold_assert(parameters->errors()->error_count() > 0 |
3452 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3453 | return; |
3454 | } | |
fc51264f L |
3455 | Target_x86_64<size>::Relocate::tls_ie_to_le(relinfo, relnum, |
3456 | tls_segment, rela, | |
3457 | r_type, value, view, | |
3458 | view_size); | |
56622147 ILT |
3459 | break; |
3460 | } | |
7bf1f802 ILT |
3461 | else if (optimized_type == tls::TLSOPT_NONE) |
3462 | { | |
3463 | // Relocate the field with the offset of the GOT entry for | |
3464 | // the tp-relative offset of the symbol. | |
3465 | unsigned int got_offset; | |
3466 | if (gsym != NULL) | |
3467 | { | |
0a65a3a7 CC |
3468 | gold_assert(gsym->has_got_offset(GOT_TYPE_TLS_OFFSET)); |
3469 | got_offset = (gsym->got_offset(GOT_TYPE_TLS_OFFSET) | |
3470 | - target->got_size()); | |
7bf1f802 ILT |
3471 | } |
3472 | else | |
3473 | { | |
fc51264f | 3474 | unsigned int r_sym = elfcpp::elf_r_sym<size>(rela.get_r_info()); |
0a65a3a7 CC |
3475 | gold_assert(object->local_has_got_offset(r_sym, |
3476 | GOT_TYPE_TLS_OFFSET)); | |
3477 | got_offset = (object->local_got_offset(r_sym, GOT_TYPE_TLS_OFFSET) | |
7bf1f802 ILT |
3478 | - target->got_size()); |
3479 | } | |
6a41d30b | 3480 | value = target->got_plt_section()->address() + got_offset; |
fc51264f L |
3481 | Relocate_functions<size, false>::pcrela32(view, value, addend, |
3482 | address); | |
7bf1f802 ILT |
3483 | break; |
3484 | } | |
56622147 ILT |
3485 | gold_error_at_location(relinfo, relnum, rela.get_r_offset(), |
3486 | _("unsupported reloc type %u"), | |
3487 | r_type); | |
3488 | break; | |
0ffd9845 | 3489 | |
56622147 | 3490 | case elfcpp::R_X86_64_TPOFF32: // Local-exec |
62855347 ILT |
3491 | if (tls_segment == NULL) |
3492 | { | |
191f1a2d ILT |
3493 | gold_assert(parameters->errors()->error_count() > 0 |
3494 | || issue_undefined_symbol_error(gsym)); | |
62855347 ILT |
3495 | return; |
3496 | } | |
6a41d30b | 3497 | value -= tls_segment->memsz(); |
fc51264f | 3498 | Relocate_functions<size, false>::rela32(view, value, addend); |
56622147 | 3499 | break; |
2e30d253 | 3500 | } |
2e30d253 ILT |
3501 | } |
3502 | ||
7bf1f802 ILT |
3503 | // Do a relocation in which we convert a TLS General-Dynamic to an |
3504 | // Initial-Exec. | |
3505 | ||
fc51264f | 3506 | template<int size> |
7bf1f802 | 3507 | inline void |
fc51264f L |
3508 | Target_x86_64<size>::Relocate::tls_gd_to_ie( |
3509 | const Relocate_info<size, false>* relinfo, | |
3510 | size_t relnum, | |
3511 | Output_segment*, | |
3512 | const elfcpp::Rela<size, false>& rela, | |
3513 | unsigned int, | |
3514 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3515 | unsigned char* view, | |
3516 | typename elfcpp::Elf_types<size>::Elf_Addr address, | |
3517 | section_size_type view_size) | |
7bf1f802 ILT |
3518 | { |
3519 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; | |
3520 | // .word 0x6666; rex64; call __tls_get_addr | |
3521 | // ==> movq %fs:0,%rax; addq x@gottpoff(%rip),%rax | |
3522 | ||
3523 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); | |
3524 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
3525 | ||
3526 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3527 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3528 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3529 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
3530 | ||
3531 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x03\x05\0\0\0\0", 16); | |
3532 | ||
c2b45e22 | 3533 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); |
fc51264f L |
3534 | Relocate_functions<size, false>::pcrela32(view + 8, value, addend - 8, |
3535 | address); | |
7bf1f802 ILT |
3536 | |
3537 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3538 | // We can skip it. | |
3539 | this->skip_call_tls_get_addr_ = true; | |
3540 | } | |
3541 | ||
e041f13d | 3542 | // Do a relocation in which we convert a TLS General-Dynamic to a |
2e30d253 ILT |
3543 | // Local-Exec. |
3544 | ||
fc51264f | 3545 | template<int size> |
2e30d253 | 3546 | inline void |
fc51264f L |
3547 | Target_x86_64<size>::Relocate::tls_gd_to_le( |
3548 | const Relocate_info<size, false>* relinfo, | |
3549 | size_t relnum, | |
3550 | Output_segment* tls_segment, | |
3551 | const elfcpp::Rela<size, false>& rela, | |
3552 | unsigned int, | |
3553 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3554 | unsigned char* view, | |
3555 | section_size_type view_size) | |
2e30d253 | 3556 | { |
0ffd9845 ILT |
3557 | // .byte 0x66; leaq foo@tlsgd(%rip),%rdi; |
3558 | // .word 0x6666; rex64; call __tls_get_addr | |
3559 | // ==> movq %fs:0,%rax; leaq x@tpoff(%rax),%rax | |
2e30d253 | 3560 | |
72ec2876 ILT |
3561 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -4); |
3562 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 12); | |
2e30d253 | 3563 | |
72ec2876 ILT |
3564 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
3565 | (memcmp(view - 4, "\x66\x48\x8d\x3d", 4) == 0)); | |
3566 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3567 | (memcmp(view + 4, "\x66\x66\x48\xe8", 4) == 0)); | |
2e30d253 | 3568 | |
0ffd9845 | 3569 | memcpy(view - 4, "\x64\x48\x8b\x04\x25\0\0\0\0\x48\x8d\x80\0\0\0\0", 16); |
2e30d253 | 3570 | |
6a41d30b | 3571 | value -= tls_segment->memsz(); |
fc51264f | 3572 | Relocate_functions<size, false>::rela32(view + 8, value, 0); |
2e30d253 ILT |
3573 | |
3574 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3575 | // We can skip it. | |
3576 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3577 | } |
3578 | ||
c2b45e22 CC |
3579 | // Do a TLSDESC-style General-Dynamic to Initial-Exec transition. |
3580 | ||
fc51264f | 3581 | template<int size> |
c2b45e22 | 3582 | inline void |
fc51264f L |
3583 | Target_x86_64<size>::Relocate::tls_desc_gd_to_ie( |
3584 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3585 | size_t relnum, |
3586 | Output_segment*, | |
fc51264f | 3587 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3588 | unsigned int r_type, |
fc51264f | 3589 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 | 3590 | unsigned char* view, |
fc51264f | 3591 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
c2b45e22 CC |
3592 | section_size_type view_size) |
3593 | { | |
3594 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3595 | { | |
3596 | // leaq foo@tlsdesc(%rip), %rax | |
3597 | // ==> movq foo@gottpoff(%rip), %rax | |
3598 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3599 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3600 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3601 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
3602 | view[-2] = 0x8b; | |
3603 | const elfcpp::Elf_Xword addend = rela.get_r_addend(); | |
fc51264f | 3604 | Relocate_functions<size, false>::pcrela32(view, value, addend, address); |
c2b45e22 CC |
3605 | } |
3606 | else | |
3607 | { | |
3608 | // call *foo@tlscall(%rax) | |
3609 | // ==> nop; nop | |
3610 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3611 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3612 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3613 | view[0] == 0xff && view[1] == 0x10); | |
3614 | view[0] = 0x66; | |
3615 | view[1] = 0x90; | |
3616 | } | |
3617 | } | |
3618 | ||
3619 | // Do a TLSDESC-style General-Dynamic to Local-Exec transition. | |
3620 | ||
fc51264f | 3621 | template<int size> |
c2b45e22 | 3622 | inline void |
fc51264f L |
3623 | Target_x86_64<size>::Relocate::tls_desc_gd_to_le( |
3624 | const Relocate_info<size, false>* relinfo, | |
c2b45e22 CC |
3625 | size_t relnum, |
3626 | Output_segment* tls_segment, | |
fc51264f | 3627 | const elfcpp::Rela<size, false>& rela, |
c2b45e22 | 3628 | unsigned int r_type, |
fc51264f | 3629 | typename elfcpp::Elf_types<size>::Elf_Addr value, |
c2b45e22 CC |
3630 | unsigned char* view, |
3631 | section_size_type view_size) | |
3632 | { | |
3633 | if (r_type == elfcpp::R_X86_64_GOTPC32_TLSDESC) | |
3634 | { | |
3635 | // leaq foo@tlsdesc(%rip), %rax | |
3636 | // ==> movq foo@tpoff, %rax | |
3637 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3638 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3639 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3640 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x05); | |
3641 | view[-2] = 0xc7; | |
3642 | view[-1] = 0xc0; | |
3643 | value -= tls_segment->memsz(); | |
fc51264f | 3644 | Relocate_functions<size, false>::rela32(view, value, 0); |
c2b45e22 CC |
3645 | } |
3646 | else | |
3647 | { | |
3648 | // call *foo@tlscall(%rax) | |
3649 | // ==> nop; nop | |
3650 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC_CALL); | |
3651 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 2); | |
3652 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), | |
3653 | view[0] == 0xff && view[1] == 0x10); | |
3654 | view[0] = 0x66; | |
3655 | view[1] = 0x90; | |
3656 | } | |
3657 | } | |
3658 | ||
fc51264f | 3659 | template<int size> |
2e30d253 | 3660 | inline void |
fc51264f L |
3661 | Target_x86_64<size>::Relocate::tls_ld_to_le( |
3662 | const Relocate_info<size, false>* relinfo, | |
3663 | size_t relnum, | |
3664 | Output_segment*, | |
3665 | const elfcpp::Rela<size, false>& rela, | |
3666 | unsigned int, | |
3667 | typename elfcpp::Elf_types<size>::Elf_Addr, | |
3668 | unsigned char* view, | |
3669 | section_size_type view_size) | |
2e30d253 | 3670 | { |
72ec2876 ILT |
3671 | // leaq foo@tlsld(%rip),%rdi; call __tls_get_addr@plt; |
3672 | // ... leq foo@dtpoff(%rax),%reg | |
3673 | // ==> .word 0x6666; .byte 0x66; movq %fs:0,%rax ... leaq x@tpoff(%rax),%rdx | |
2e30d253 | 3674 | |
72ec2876 ILT |
3675 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); |
3676 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 9); | |
2e30d253 | 3677 | |
72ec2876 ILT |
3678 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), |
3679 | view[-3] == 0x48 && view[-2] == 0x8d && view[-1] == 0x3d); | |
3680 | ||
3681 | tls::check_tls(relinfo, relnum, rela.get_r_offset(), view[4] == 0xe8); | |
3682 | ||
3683 | memcpy(view - 3, "\x66\x66\x66\x64\x48\x8b\x04\x25\0\0\0\0", 12); | |
3684 | ||
3685 | // The next reloc should be a PLT32 reloc against __tls_get_addr. | |
3686 | // We can skip it. | |
3687 | this->skip_call_tls_get_addr_ = true; | |
2e30d253 ILT |
3688 | } |
3689 | ||
56622147 ILT |
3690 | // Do a relocation in which we convert a TLS Initial-Exec to a |
3691 | // Local-Exec. | |
3692 | ||
fc51264f | 3693 | template<int size> |
56622147 | 3694 | inline void |
fc51264f L |
3695 | Target_x86_64<size>::Relocate::tls_ie_to_le( |
3696 | const Relocate_info<size, false>* relinfo, | |
3697 | size_t relnum, | |
3698 | Output_segment* tls_segment, | |
3699 | const elfcpp::Rela<size, false>& rela, | |
3700 | unsigned int, | |
3701 | typename elfcpp::Elf_types<size>::Elf_Addr value, | |
3702 | unsigned char* view, | |
3703 | section_size_type view_size) | |
56622147 ILT |
3704 | { |
3705 | // We need to examine the opcodes to figure out which instruction we | |
3706 | // are looking at. | |
3707 | ||
3708 | // movq foo@gottpoff(%rip),%reg ==> movq $YY,%reg | |
3709 | // addq foo@gottpoff(%rip),%reg ==> addq $YY,%reg | |
3710 | ||
3711 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, -3); | |
3712 | tls::check_range(relinfo, relnum, rela.get_r_offset(), view_size, 4); | |
3713 | ||
3714 | unsigned char op1 = view[-3]; | |
3715 | unsigned char op2 = view[-2]; | |
3716 | unsigned char op3 = view[-1]; | |
3717 | unsigned char reg = op3 >> 3; | |
3718 | ||
3719 | if (op2 == 0x8b) | |
3720 | { | |
3721 | // movq | |
3722 | if (op1 == 0x4c) | |
3723 | view[-3] = 0x49; | |
3724 | view[-2] = 0xc7; | |
3725 | view[-1] = 0xc0 | reg; | |
3726 | } | |
3727 | else if (reg == 4) | |
3728 | { | |
3729 | // Special handling for %rsp. | |
3730 | if (op1 == 0x4c) | |
3731 | view[-3] = 0x49; | |
3732 | view[-2] = 0x81; | |
3733 | view[-1] = 0xc0 | reg; | |
3734 | } | |
3735 | else | |
3736 | { | |
3737 | // addq | |
3738 | if (op1 == 0x4c) | |
3739 | view[-3] = 0x4d; | |
3740 | view[-2] = 0x8d; | |
3741 | view[-1] = 0x80 | reg | (reg << 3); | |
3742 | } | |
3743 | ||
6a41d30b | 3744 | value -= tls_segment->memsz(); |
fc51264f | 3745 | Relocate_functions<size, false>::rela32(view, value, 0); |
56622147 ILT |
3746 | } |
3747 | ||
2e30d253 ILT |
3748 | // Relocate section data. |
3749 | ||
fc51264f | 3750 | template<int size> |
2e30d253 | 3751 | void |
fc51264f L |
3752 | Target_x86_64<size>::relocate_section( |
3753 | const Relocate_info<size, false>* relinfo, | |
364c7fa5 ILT |
3754 | unsigned int sh_type, |
3755 | const unsigned char* prelocs, | |
3756 | size_t reloc_count, | |
3757 | Output_section* output_section, | |
3758 | bool needs_special_offset_handling, | |
3759 | unsigned char* view, | |
fc51264f | 3760 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
364c7fa5 ILT |
3761 | section_size_type view_size, |
3762 | const Reloc_symbol_changes* reloc_symbol_changes) | |
2e30d253 ILT |
3763 | { |
3764 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3765 | ||
fc51264f L |
3766 | gold::relocate_section<size, false, Target_x86_64<size>, elfcpp::SHT_RELA, |
3767 | Target_x86_64<size>::Relocate>( | |
2e30d253 ILT |
3768 | relinfo, |
3769 | this, | |
3770 | prelocs, | |
3771 | reloc_count, | |
730cdc88 ILT |
3772 | output_section, |
3773 | needs_special_offset_handling, | |
2e30d253 ILT |
3774 | view, |
3775 | address, | |
364c7fa5 ILT |
3776 | view_size, |
3777 | reloc_symbol_changes); | |
2e30d253 ILT |
3778 | } |
3779 | ||
94a3fc8b CC |
3780 | // Apply an incremental relocation. Incremental relocations always refer |
3781 | // to global symbols. | |
3782 | ||
fc51264f | 3783 | template<int size> |
94a3fc8b | 3784 | void |
fc51264f L |
3785 | Target_x86_64<size>::apply_relocation( |
3786 | const Relocate_info<size, false>* relinfo, | |
3787 | typename elfcpp::Elf_types<size>::Elf_Addr r_offset, | |
94a3fc8b | 3788 | unsigned int r_type, |
fc51264f | 3789 | typename elfcpp::Elf_types<size>::Elf_Swxword r_addend, |
94a3fc8b CC |
3790 | const Symbol* gsym, |
3791 | unsigned char* view, | |
fc51264f | 3792 | typename elfcpp::Elf_types<size>::Elf_Addr address, |
94a3fc8b CC |
3793 | section_size_type view_size) |
3794 | { | |
fc51264f L |
3795 | gold::apply_relocation<size, false, Target_x86_64<size>, |
3796 | Target_x86_64<size>::Relocate>( | |
94a3fc8b CC |
3797 | relinfo, |
3798 | this, | |
3799 | r_offset, | |
3800 | r_type, | |
3801 | r_addend, | |
3802 | gsym, | |
3803 | view, | |
3804 | address, | |
3805 | view_size); | |
3806 | } | |
3807 | ||
6a74a719 ILT |
3808 | // Return the size of a relocation while scanning during a relocatable |
3809 | // link. | |
3810 | ||
fc51264f | 3811 | template<int size> |
6a74a719 | 3812 | unsigned int |
fc51264f | 3813 | Target_x86_64<size>::Relocatable_size_for_reloc::get_size_for_reloc( |
6a74a719 ILT |
3814 | unsigned int r_type, |
3815 | Relobj* object) | |
3816 | { | |
3817 | switch (r_type) | |
3818 | { | |
3819 | case elfcpp::R_X86_64_NONE: | |
6e5710ce ILT |
3820 | case elfcpp::R_X86_64_GNU_VTINHERIT: |
3821 | case elfcpp::R_X86_64_GNU_VTENTRY: | |
6a74a719 ILT |
3822 | case elfcpp::R_X86_64_TLSGD: // Global-dynamic |
3823 | case elfcpp::R_X86_64_GOTPC32_TLSDESC: // Global-dynamic (from ~oliva url) | |
3824 | case elfcpp::R_X86_64_TLSDESC_CALL: | |
3825 | case elfcpp::R_X86_64_TLSLD: // Local-dynamic | |
3826 | case elfcpp::R_X86_64_DTPOFF32: | |
3827 | case elfcpp::R_X86_64_DTPOFF64: | |
3828 | case elfcpp::R_X86_64_GOTTPOFF: // Initial-exec | |
3829 | case elfcpp::R_X86_64_TPOFF32: // Local-exec | |
3830 | return 0; | |
3831 | ||
3832 | case elfcpp::R_X86_64_64: | |
3833 | case elfcpp::R_X86_64_PC64: | |
3834 | case elfcpp::R_X86_64_GOTOFF64: | |
3835 | case elfcpp::R_X86_64_GOTPC64: | |
3836 | case elfcpp::R_X86_64_PLTOFF64: | |
3837 | case elfcpp::R_X86_64_GOT64: | |
3838 | case elfcpp::R_X86_64_GOTPCREL64: | |
3839 | case elfcpp::R_X86_64_GOTPCREL: | |
3840 | case elfcpp::R_X86_64_GOTPLT64: | |
3841 | return 8; | |
3842 | ||
3843 | case elfcpp::R_X86_64_32: | |
3844 | case elfcpp::R_X86_64_32S: | |
3845 | case elfcpp::R_X86_64_PC32: | |
3846 | case elfcpp::R_X86_64_PLT32: | |
3847 | case elfcpp::R_X86_64_GOTPC32: | |
3848 | case elfcpp::R_X86_64_GOT32: | |
3849 | return 4; | |
3850 | ||
3851 | case elfcpp::R_X86_64_16: | |
3852 | case elfcpp::R_X86_64_PC16: | |
3853 | return 2; | |
3854 | ||
3855 | case elfcpp::R_X86_64_8: | |
3856 | case elfcpp::R_X86_64_PC8: | |
3857 | return 1; | |
3858 | ||
3859 | case elfcpp::R_X86_64_COPY: | |
3860 | case elfcpp::R_X86_64_GLOB_DAT: | |
3861 | case elfcpp::R_X86_64_JUMP_SLOT: | |
3862 | case elfcpp::R_X86_64_RELATIVE: | |
7223e9ca | 3863 | case elfcpp::R_X86_64_IRELATIVE: |
6a74a719 ILT |
3864 | // These are outstanding tls relocs, which are unexpected when linking |
3865 | case elfcpp::R_X86_64_TPOFF64: | |
3866 | case elfcpp::R_X86_64_DTPMOD64: | |
3867 | case elfcpp::R_X86_64_TLSDESC: | |
3868 | object->error(_("unexpected reloc %u in object file"), r_type); | |
3869 | return 0; | |
3870 | ||
3871 | case elfcpp::R_X86_64_SIZE32: | |
3872 | case elfcpp::R_X86_64_SIZE64: | |
3873 | default: | |
3874 | object->error(_("unsupported reloc %u against local symbol"), r_type); | |
3875 | return 0; | |
3876 | } | |
3877 | } | |
3878 | ||
3879 | // Scan the relocs during a relocatable link. | |
3880 | ||
fc51264f | 3881 | template<int size> |
6a74a719 | 3882 | void |
fc51264f L |
3883 | Target_x86_64<size>::scan_relocatable_relocs( |
3884 | Symbol_table* symtab, | |
3885 | Layout* layout, | |
3886 | Sized_relobj_file<size, false>* object, | |
3887 | unsigned int data_shndx, | |
3888 | unsigned int sh_type, | |
3889 | const unsigned char* prelocs, | |
3890 | size_t reloc_count, | |
3891 | Output_section* output_section, | |
3892 | bool needs_special_offset_handling, | |
3893 | size_t local_symbol_count, | |
3894 | const unsigned char* plocal_symbols, | |
3895 | Relocatable_relocs* rr) | |
6a74a719 ILT |
3896 | { |
3897 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3898 | ||
3899 | typedef gold::Default_scan_relocatable_relocs<elfcpp::SHT_RELA, | |
3900 | Relocatable_size_for_reloc> Scan_relocatable_relocs; | |
3901 | ||
fc51264f | 3902 | gold::scan_relocatable_relocs<size, false, elfcpp::SHT_RELA, |
6a74a719 | 3903 | Scan_relocatable_relocs>( |
6a74a719 ILT |
3904 | symtab, |
3905 | layout, | |
3906 | object, | |
3907 | data_shndx, | |
3908 | prelocs, | |
3909 | reloc_count, | |
3910 | output_section, | |
3911 | needs_special_offset_handling, | |
3912 | local_symbol_count, | |
3913 | plocal_symbols, | |
3914 | rr); | |
3915 | } | |
3916 | ||
3917 | // Relocate a section during a relocatable link. | |
3918 | ||
fc51264f | 3919 | template<int size> |
6a74a719 | 3920 | void |
fc51264f L |
3921 | Target_x86_64<size>::relocate_for_relocatable( |
3922 | const Relocate_info<size, false>* relinfo, | |
6a74a719 ILT |
3923 | unsigned int sh_type, |
3924 | const unsigned char* prelocs, | |
3925 | size_t reloc_count, | |
3926 | Output_section* output_section, | |
3927 | off_t offset_in_output_section, | |
3928 | const Relocatable_relocs* rr, | |
3929 | unsigned char* view, | |
fc51264f | 3930 | typename elfcpp::Elf_types<size>::Elf_Addr view_address, |
6a74a719 ILT |
3931 | section_size_type view_size, |
3932 | unsigned char* reloc_view, | |
3933 | section_size_type reloc_view_size) | |
3934 | { | |
3935 | gold_assert(sh_type == elfcpp::SHT_RELA); | |
3936 | ||
fc51264f | 3937 | gold::relocate_for_relocatable<size, false, elfcpp::SHT_RELA>( |
6a74a719 ILT |
3938 | relinfo, |
3939 | prelocs, | |
3940 | reloc_count, | |
3941 | output_section, | |
3942 | offset_in_output_section, | |
3943 | rr, | |
3944 | view, | |
3945 | view_address, | |
3946 | view_size, | |
3947 | reloc_view, | |
3948 | reloc_view_size); | |
3949 | } | |
3950 | ||
4fb6c25d ILT |
3951 | // Return the value to use for a dynamic which requires special |
3952 | // treatment. This is how we support equality comparisons of function | |
3953 | // pointers across shared library boundaries, as described in the | |
3954 | // processor specific ABI supplement. | |
3955 | ||
fc51264f | 3956 | template<int size> |
4fb6c25d | 3957 | uint64_t |
fc51264f | 3958 | Target_x86_64<size>::do_dynsym_value(const Symbol* gsym) const |
4fb6c25d ILT |
3959 | { |
3960 | gold_assert(gsym->is_from_dynobj() && gsym->has_plt_offset()); | |
67181c72 | 3961 | return this->plt_address_for_global(gsym) + gsym->plt_offset(); |
4fb6c25d ILT |
3962 | } |
3963 | ||
2e30d253 ILT |
3964 | // Return a string used to fill a code section with nops to take up |
3965 | // the specified length. | |
3966 | ||
fc51264f | 3967 | template<int size> |
2e30d253 | 3968 | std::string |
fc51264f | 3969 | Target_x86_64<size>::do_code_fill(section_size_type length) const |
2e30d253 ILT |
3970 | { |
3971 | if (length >= 16) | |
3972 | { | |
3973 | // Build a jmpq instruction to skip over the bytes. | |
3974 | unsigned char jmp[5]; | |
3975 | jmp[0] = 0xe9; | |
04bf7072 | 3976 | elfcpp::Swap_unaligned<32, false>::writeval(jmp + 1, length - 5); |
2e30d253 ILT |
3977 | return (std::string(reinterpret_cast<char*>(&jmp[0]), 5) |
3978 | + std::string(length - 5, '\0')); | |
3979 | } | |
3980 | ||
3981 | // Nop sequences of various lengths. | |
76677ad0 CC |
3982 | const char nop1[1] = { '\x90' }; // nop |
3983 | const char nop2[2] = { '\x66', '\x90' }; // xchg %ax %ax | |
3984 | const char nop3[3] = { '\x0f', '\x1f', '\x00' }; // nop (%rax) | |
3985 | const char nop4[4] = { '\x0f', '\x1f', '\x40', // nop 0(%rax) | |
3986 | '\x00'}; | |
3987 | const char nop5[5] = { '\x0f', '\x1f', '\x44', // nop 0(%rax,%rax,1) | |
3988 | '\x00', '\x00' }; | |
3989 | const char nop6[6] = { '\x66', '\x0f', '\x1f', // nopw 0(%rax,%rax,1) | |
3990 | '\x44', '\x00', '\x00' }; | |
3991 | const char nop7[7] = { '\x0f', '\x1f', '\x80', // nopl 0L(%rax) | |
3992 | '\x00', '\x00', '\x00', | |
3993 | '\x00' }; | |
3994 | const char nop8[8] = { '\x0f', '\x1f', '\x84', // nopl 0L(%rax,%rax,1) | |
3995 | '\x00', '\x00', '\x00', | |
3996 | '\x00', '\x00' }; | |
3997 | const char nop9[9] = { '\x66', '\x0f', '\x1f', // nopw 0L(%rax,%rax,1) | |
3998 | '\x84', '\x00', '\x00', | |
3999 | '\x00', '\x00', '\x00' }; | |
4000 | const char nop10[10] = { '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
4001 | '\x1f', '\x84', '\x00', | |
4002 | '\x00', '\x00', '\x00', | |
4003 | '\x00' }; | |
4004 | const char nop11[11] = { '\x66', '\x66', '\x2e', // data16 | |
4005 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) | |
4006 | '\x00', '\x00', '\x00', | |
4007 | '\x00', '\x00' }; | |
4008 | const char nop12[12] = { '\x66', '\x66', '\x66', // data16; data16 | |
4009 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) | |
4010 | '\x84', '\x00', '\x00', | |
4011 | '\x00', '\x00', '\x00' }; | |
4012 | const char nop13[13] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
4013 | '\x66', '\x2e', '\x0f', // nopw %cs:0L(%rax,%rax,1) | |
4014 | '\x1f', '\x84', '\x00', | |
4015 | '\x00', '\x00', '\x00', | |
4016 | '\x00' }; | |
4017 | const char nop14[14] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
4018 | '\x66', '\x66', '\x2e', // data16 | |
4019 | '\x0f', '\x1f', '\x84', // nopw %cs:0L(%rax,%rax,1) | |
4020 | '\x00', '\x00', '\x00', | |
4021 | '\x00', '\x00' }; | |
4022 | const char nop15[15] = { '\x66', '\x66', '\x66', // data16; data16; data16 | |
4023 | '\x66', '\x66', '\x66', // data16; data16 | |
4024 | '\x2e', '\x0f', '\x1f', // nopw %cs:0L(%rax,%rax,1) | |
4025 | '\x84', '\x00', '\x00', | |
4026 | '\x00', '\x00', '\x00' }; | |
2e30d253 ILT |
4027 | |
4028 | const char* nops[16] = { | |
4029 | NULL, | |
4030 | nop1, nop2, nop3, nop4, nop5, nop6, nop7, | |
4031 | nop8, nop9, nop10, nop11, nop12, nop13, nop14, nop15 | |
4032 | }; | |
4033 | ||
4034 | return std::string(nops[length], length); | |
4035 | } | |
4036 | ||
e291e7b9 ILT |
4037 | // Return the addend to use for a target specific relocation. The |
4038 | // only target specific relocation is R_X86_64_TLSDESC for a local | |
4039 | // symbol. We want to set the addend is the offset of the local | |
4040 | // symbol in the TLS segment. | |
4041 | ||
fc51264f | 4042 | template<int size> |
e291e7b9 | 4043 | uint64_t |
fc51264f L |
4044 | Target_x86_64<size>::do_reloc_addend(void* arg, unsigned int r_type, |
4045 | uint64_t) const | |
e291e7b9 ILT |
4046 | { |
4047 | gold_assert(r_type == elfcpp::R_X86_64_TLSDESC); | |
4048 | uintptr_t intarg = reinterpret_cast<uintptr_t>(arg); | |
4049 | gold_assert(intarg < this->tlsdesc_reloc_info_.size()); | |
4050 | const Tlsdesc_info& ti(this->tlsdesc_reloc_info_[intarg]); | |
fc51264f | 4051 | const Symbol_value<size>* psymval = ti.object->local_symbol(ti.r_sym); |
e291e7b9 ILT |
4052 | gold_assert(psymval->is_tls_symbol()); |
4053 | // The value of a TLS symbol is the offset in the TLS segment. | |
4054 | return psymval->value(ti.object, 0); | |
4055 | } | |
4056 | ||
02d7cd44 ILT |
4057 | // Return the value to use for the base of a DW_EH_PE_datarel offset |
4058 | // in an FDE. Solaris and SVR4 use DW_EH_PE_datarel because their | |
4059 | // assembler can not write out the difference between two labels in | |
4060 | // different sections, so instead of using a pc-relative value they | |
4061 | // use an offset from the GOT. | |
4062 | ||
fc51264f | 4063 | template<int size> |
02d7cd44 | 4064 | uint64_t |
fc51264f | 4065 | Target_x86_64<size>::do_ehframe_datarel_base() const |
02d7cd44 ILT |
4066 | { |
4067 | gold_assert(this->global_offset_table_ != NULL); | |
4068 | Symbol* sym = this->global_offset_table_; | |
fc51264f | 4069 | Sized_symbol<size>* ssym = static_cast<Sized_symbol<size>*>(sym); |
02d7cd44 ILT |
4070 | return ssym->value(); |
4071 | } | |
4072 | ||
364c7fa5 | 4073 | // FNOFFSET in section SHNDX in OBJECT is the start of a function |
9b547ce6 | 4074 | // compiled with -fsplit-stack. The function calls non-split-stack |
364c7fa5 ILT |
4075 | // code. We have to change the function so that it always ensures |
4076 | // that it has enough stack space to run some random function. | |
4077 | ||
fc51264f | 4078 | template<int size> |
364c7fa5 | 4079 | void |
fc51264f L |
4080 | Target_x86_64<size>::do_calls_non_split(Relobj* object, unsigned int shndx, |
4081 | section_offset_type fnoffset, | |
4082 | section_size_type fnsize, | |
4083 | unsigned char* view, | |
4084 | section_size_type view_size, | |
4085 | std::string* from, | |
4086 | std::string* to) const | |
364c7fa5 ILT |
4087 | { |
4088 | // The function starts with a comparison of the stack pointer and a | |
4089 | // field in the TCB. This is followed by a jump. | |
4090 | ||
4091 | // cmp %fs:NN,%rsp | |
4092 | if (this->match_view(view, view_size, fnoffset, "\x64\x48\x3b\x24\x25", 5) | |
4093 | && fnsize > 9) | |
4094 | { | |
4095 | // We will call __morestack if the carry flag is set after this | |
4096 | // comparison. We turn the comparison into an stc instruction | |
4097 | // and some nops. | |
4098 | view[fnoffset] = '\xf9'; | |
4099 | this->set_view_to_nop(view, view_size, fnoffset + 1, 8); | |
4100 | } | |
4101 | // lea NN(%rsp),%r10 | |
cbc999b9 ILT |
4102 | // lea NN(%rsp),%r11 |
4103 | else if ((this->match_view(view, view_size, fnoffset, | |
4104 | "\x4c\x8d\x94\x24", 4) | |
4105 | || this->match_view(view, view_size, fnoffset, | |
4106 | "\x4c\x8d\x9c\x24", 4)) | |
364c7fa5 ILT |
4107 | && fnsize > 8) |
4108 | { | |
4109 | // This is loading an offset from the stack pointer for a | |
4110 | // comparison. The offset is negative, so we decrease the | |
4111 | // offset by the amount of space we need for the stack. This | |
4112 | // means we will avoid calling __morestack if there happens to | |
4113 | // be plenty of space on the stack already. | |
4114 | unsigned char* pval = view + fnoffset + 4; | |
4115 | uint32_t val = elfcpp::Swap_unaligned<32, false>::readval(pval); | |
4116 | val -= parameters->options().split_stack_adjust_size(); | |
4117 | elfcpp::Swap_unaligned<32, false>::writeval(pval, val); | |
4118 | } | |
4119 | else | |
4120 | { | |
4121 | if (!object->has_no_split_stack()) | |
4122 | object->error(_("failed to match split-stack sequence at " | |
4123 | "section %u offset %0zx"), | |
ac33a407 | 4124 | shndx, static_cast<size_t>(fnoffset)); |
364c7fa5 ILT |
4125 | return; |
4126 | } | |
4127 | ||
4128 | // We have to change the function so that it calls | |
4129 | // __morestack_non_split instead of __morestack. The former will | |
4130 | // allocate additional stack space. | |
4131 | *from = "__morestack"; | |
4132 | *to = "__morestack_non_split"; | |
4133 | } | |
4134 | ||
2e30d253 ILT |
4135 | // The selector for x86_64 object files. |
4136 | ||
fc51264f | 4137 | template<int size> |
36959681 | 4138 | class Target_selector_x86_64 : public Target_selector_freebsd |
2e30d253 ILT |
4139 | { |
4140 | public: | |
4141 | Target_selector_x86_64() | |
fc51264f L |
4142 | : Target_selector_freebsd(elfcpp::EM_X86_64, size, false, |
4143 | (size == 64 | |
4144 | ? "elf64-x86-64" : "elf32-x86-64"), | |
4145 | (size == 64 | |
4146 | ? "elf64-x86-64-freebsd" | |
4147 | : "elf32-x86-64-freebsd"), | |
4148 | (size == 64 ? "elf_x86_64" : "elf32_x86_64")) | |
2e30d253 ILT |
4149 | { } |
4150 | ||
4151 | Target* | |
e96caa79 | 4152 | do_instantiate_target() |
fc51264f | 4153 | { return new Target_x86_64<size>(); } |
36959681 | 4154 | |
2e30d253 ILT |
4155 | }; |
4156 | ||
fc51264f L |
4157 | Target_selector_x86_64<64> target_selector_x86_64; |
4158 | Target_selector_x86_64<32> target_selector_x32; | |
2e30d253 ILT |
4159 | |
4160 | } // End anonymous namespace. |